Release 4.11 kernel/trace/trace.c

/*
 * ring buffer based function tracer
 *
 * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com>
 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
 *
 * Originally taken from the RT patch by:
 *    Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Based on code from the latency_tracer, that is:
 *  Copyright (C) 2004-2006 Ingo Molnar
 *  Copyright (C) 2004 Nadia Yvette Chambers
 */
#include <linux/ring_buffer.h>
#include <generated/utsrelease.h>
#include <linux/stacktrace.h>
#include <linux/writeback.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/notifier.h>
#include <linux/irqflags.h>
#include <linux/debugfs.h>
#include <linux/tracefs.h>
#include <linux/pagemap.h>
#include <linux/hardirq.h>
#include <linux/linkage.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/percpu.h>
#include <linux/splice.h>
#include <linux/kdebug.h>
#include <linux/string.h>
#include <linux/mount.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/nmi.h>
#include <linux/fs.h>
#include <linux/trace.h>
#include <linux/sched/rt.h>

#include "trace.h"
#include "trace_output.h"

/*
 * On boot up, the ring buffer is set to the minimum size, so that
 * we do not waste memory on systems that are not using tracing.
 */

bool ring_buffer_expanded;

/*
 * We need to change this state when a selftest is running.
 * A selftest will lurk into the ring-buffer to count the
 * entries inserted during the selftest although some concurrent
 * insertions into the ring-buffer such as trace_printk could occurred
 * at the same time, giving false positive or negative results.
 */

static bool __read_mostly tracing_selftest_running;

/*
 * If a tracer is running, we do not want to run SELFTEST.
 */

bool __read_mostly tracing_selftest_disabled;

/* Pipe tracepoints to printk */

struct trace_iterator *tracepoint_print_iter;

int tracepoint_printk;
static DEFINE_STATIC_KEY_FALSE(tracepoint_printk_key);

/* For tracers that don't implement custom flags */

static struct tracer_opt dummy_tracer_opt[] = {
	{ }
};


static int

dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
	return 0;
}

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/*
 * To prevent the comm cache from being overwritten when no
 * tracing is active, only save the comm when a trace event
 * occurred.
 */
static DEFINE_PER_CPU(bool, trace_cmdline_save);

/*
 * Kill all tracing for good (never come back).
 * It is initialized to 1 but will turn to zero if the initialization
 * of the tracer is successful. But that is the only place that sets
 * this back to zero.
 */

static int tracing_disabled = 1;


cpumask_var_t __read_mostly	tracing_buffer_mask;

/*
 * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
 *
 * If there is an oops (or kernel panic) and the ftrace_dump_on_oops
 * is set, then ftrace_dump is called. This will output the contents
 * of the ftrace buffers to the console.  This is very useful for
 * capturing traces that lead to crashes and outputing it to a
 * serial console.
 *
 * It is default off, but you can enable it with either specifying
 * "ftrace_dump_on_oops" in the kernel command line, or setting
 * /proc/sys/kernel/ftrace_dump_on_oops
 * Set 1 if you want to dump buffers of all CPUs
 * Set 2 if you want to dump the buffer of the CPU that triggered oops
 */


enum ftrace_dump_mode ftrace_dump_on_oops;

/* When set, tracing will stop when a WARN*() is hit */

int __disable_trace_on_warning;

#ifdef CONFIG_TRACE_ENUM_MAP_FILE
/* Map of enums to their values, for "enum_map" file */

struct trace_enum_map_head {
	
struct module			*mod;
	
unsigned long			length;
};

union trace_enum_map_item;


struct trace_enum_map_tail {
	/*
         * "end" is first and points to NULL as it must be different
         * than "mod" or "enum_string"
         */
	
union trace_enum_map_item	*next;
	
const char			*end;	/* points to NULL */
};

static DEFINE_MUTEX(trace_enum_mutex);

/*
 * The trace_enum_maps are saved in an array with two extra elements,
 * one at the beginning, and one at the end. The beginning item contains
 * the count of the saved maps (head.length), and the module they
 * belong to if not built in (head.mod). The ending item contains a
 * pointer to the next array of saved enum_map items.
 */

union trace_enum_map_item {
	
struct trace_enum_map		map;
	
struct trace_enum_map_head	head;
	
struct trace_enum_map_tail	tail;
};


static union trace_enum_map_item *trace_enum_maps;
#endif /* CONFIG_TRACE_ENUM_MAP_FILE */

static int tracing_set_tracer(struct trace_array *tr, const char *buf);


#define MAX_TRACER_SIZE		100

static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;

static char *default_bootup_tracer;


static bool allocate_snapshot;



static int __init set_cmdline_ftrace(char *str)
{
	strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
	default_bootup_tracer = bootup_tracer_buf;
	/* We are using ftrace early, expand it */
	ring_buffer_expanded = true;
	return 1;
}
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__setup("ftrace=", set_cmdline_ftrace);



static int __init set_ftrace_dump_on_oops(char *str)
{
	if (*str++ != '=' || !*str) {
		ftrace_dump_on_oops = DUMP_ALL;
		return 1;
	}

	if (!strcmp("orig_cpu", str)) {
		ftrace_dump_on_oops = DUMP_ORIG;
                return 1;
        }

        return 0;
}
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__setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);



static int __init stop_trace_on_warning(char *str)
{
	if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
		__disable_trace_on_warning = 1;
	return 1;
}
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__setup("traceoff_on_warning", stop_trace_on_warning);



static int __init boot_alloc_snapshot(char *str)
{
	allocate_snapshot = true;
	/* We also need the main ring buffer expanded */
	ring_buffer_expanded = true;
	return 1;
}
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__setup("alloc_snapshot", boot_alloc_snapshot);



static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;



static int __init set_trace_boot_options(char *str)
{
	strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
	return 0;
}
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__setup("trace_options=", set_trace_boot_options);


static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata;

static char *trace_boot_clock __initdata;



static int __init set_trace_boot_clock(char *str)
{
	strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
	trace_boot_clock = trace_boot_clock_buf;
	return 0;
}
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__setup("trace_clock=", set_trace_boot_clock);



static int __init set_tracepoint_printk(char *str)
{
	if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
		tracepoint_printk = 1;
	return 1;
}
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__setup("tp_printk", set_tracepoint_printk);



unsigned long long ns2usecs(u64 nsec)
{
	nsec += 500;
	do_div(nsec, 1000);
	return nsec;
}

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/* trace_flags holds trace_options default values */

#define TRACE_DEFAULT_FLAGS						\
	(FUNCTION_DEFAULT_FLAGS |                                       \
         TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |                  \
         TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |                \
         TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |                 \
         TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS)

/* trace_options that are only supported by global_trace */

#define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK |                    \
               TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD)

/* trace_flags that are default zero for instances */

#define ZEROED_TRACE_FLAGS \
	TRACE_ITER_EVENT_FORK

/*
 * The global_trace is the descriptor that holds the top-level tracing
 * buffers for the live tracing.
 */

static struct trace_array global_trace = {
	.trace_flags = TRACE_DEFAULT_FLAGS,
};


LIST_HEAD(ftrace_trace_arrays);



int trace_array_get(struct trace_array *this_tr)
{
	struct trace_array *tr;
	int ret = -ENODEV;

	mutex_lock(&trace_types_lock);
	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		if (tr == this_tr) {
			tr->ref++;
			ret = 0;
			break;
		}
	}
	mutex_unlock(&trace_types_lock);

	return ret;
}

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static void __trace_array_put(struct trace_array *this_tr)
{
	WARN_ON(!this_tr->ref);
	this_tr->ref--;
}

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void trace_array_put(struct trace_array *this_tr)
{
	mutex_lock(&trace_types_lock);
	__trace_array_put(this_tr);
	mutex_unlock(&trace_types_lock);
}

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int call_filter_check_discard(struct trace_event_call *call, void *rec,
			      struct ring_buffer *buffer,
			      struct ring_buffer_event *event)
{
	if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
	    !filter_match_preds(call->filter, rec)) {
		__trace_event_discard_commit(buffer, event);
		return 1;
	}

	return 0;
}

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void trace_free_pid_list(struct trace_pid_list *pid_list)
{
	vfree(pid_list->pids);
	kfree(pid_list);
}

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/**
 * trace_find_filtered_pid - check if a pid exists in a filtered_pid list
 * @filtered_pids: The list of pids to check
 * @search_pid: The PID to find in @filtered_pids
 *
 * Returns true if @search_pid is fonud in @filtered_pids, and false otherwis.
 */

bool

trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid)
{
	/*
         * If pid_max changed after filtered_pids was created, we
         * by default ignore all pids greater than the previous pid_max.
         */
	if (search_pid >= filtered_pids->pid_max)
		return false;

	return test_bit(search_pid, filtered_pids->pids);
}

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/**
 * trace_ignore_this_task - should a task be ignored for tracing
 * @filtered_pids: The list of pids to check
 * @task: The task that should be ignored if not filtered
 *
 * Checks if @task should be traced or not from @filtered_pids.
 * Returns true if @task should *NOT* be traced.
 * Returns false if @task should be traced.
 */

bool

trace_ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task)
{
	/*
         * Return false, because if filtered_pids does not exist,
         * all pids are good to trace.
         */
	if (!filtered_pids)
		return false;

	return !trace_find_filtered_pid(filtered_pids, task->pid);
}

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/**
 * trace_pid_filter_add_remove - Add or remove a task from a pid_list
 * @pid_list: The list to modify
 * @self: The current task for fork or NULL for exit
 * @task: The task to add or remove
 *
 * If adding a task, if @self is defined, the task is only added if @self
 * is also included in @pid_list. This happens on fork and tasks should
 * only be added when the parent is listed. If @self is NULL, then the
 * @task pid will be removed from the list, which would happen on exit
 * of a task.
 */


void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
				  struct task_struct *self,
				  struct task_struct *task)
{
	if (!pid_list)
		return;

	/* For forks, we only add if the forking task is listed */
	if (self) {
		if (!trace_find_filtered_pid(pid_list, self->pid))
			return;
	}

	/* Sorry, but we don't support pid_max changing after setting */
	if (task->pid >= pid_list->pid_max)
		return;

	/* "self" is set for forks, and NULL for exits */
	if (self)
		set_bit(task->pid, pid_list->pids);
	else
		clear_bit(task->pid, pid_list->pids);
}

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/**
 * trace_pid_next - Used for seq_file to get to the next pid of a pid_list
 * @pid_list: The pid list to show
 * @v: The last pid that was shown (+1 the actual pid to let zero be displayed)
 * @pos: The position of the file
 *
 * This is used by the seq_file "next" operation to iterate the pids
 * listed in a trace_pid_list structure.
 *
 * Returns the pid+1 as we want to display pid of zero, but NULL would
 * stop the iteration.
 */


void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos)
{
	unsigned long pid = (unsigned long)v;

	(*pos)++;

	/* pid already is +1 of the actual prevous bit */
	pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid);

	/* Return pid + 1 to allow zero to be represented */
	if (pid < pid_list->pid_max)
		return (void *)(pid + 1);

	return NULL;
}

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/**
 * trace_pid_start - Used for seq_file to start reading pid lists
 * @pid_list: The pid list to show
 * @pos: The position of the file
 *
 * This is used by seq_file "start" operation to start the iteration
 * of listing pids.
 *
 * Returns the pid+1 as we want to display pid of zero, but NULL would
 * stop the iteration.
 */


void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos)
{
	unsigned long pid;
	loff_t l = 0;

	pid = find_first_bit(pid_list->pids, pid_list->pid_max);
	if (pid >= pid_list->pid_max)
		return NULL;

	/* Return pid + 1 so that zero can be the exit value */
	for (pid++; pid && l < *pos;
	     pid = (unsigned long)trace_pid_next(pid_list, (void *)pid, &l))
		;
	return (void *)pid;
}

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/**
 * trace_pid_show - show the current pid in seq_file processing
 * @m: The seq_file structure to write into
 * @v: A void pointer of the pid (+1) value to display
 *
 * Can be directly used by seq_file operations to display the current
 * pid value.
 */


int trace_pid_show(struct seq_file *m, void *v)
{
	unsigned long pid = (unsigned long)v - 1;

	seq_printf(m, "%lu\n", pid);
	return 0;
}

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/* 128 should be much more than enough */

#define PID_BUF_SIZE		127



int trace_pid_write(struct trace_pid_list *filtered_pids,
		    struct trace_pid_list **new_pid_list,
		    const char __user *ubuf, size_t cnt)
{
	struct trace_pid_list *pid_list;
	struct trace_parser parser;
	unsigned long val;
	int nr_pids = 0;
	ssize_t read = 0;
	ssize_t ret = 0;
	loff_t pos;
	pid_t pid;

	if (trace_parser_get_init(&parser, PID_BUF_SIZE + 1))
		return -ENOMEM;

	/*
         * Always recreate a new array. The write is an all or nothing
         * operation. Always create a new array when adding new pids by
         * the user. If the operation fails, then the current list is
         * not modified.
         */
	pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL);
	if (!pid_list)
		return -ENOMEM;

	pid_list->pid_max = READ_ONCE(pid_max);

	/* Only truncating will shrink pid_max */
	if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max)
		pid_list->pid_max = filtered_pids->pid_max;

	pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3);
	if (!pid_list->pids) {
		kfree(pid_list);
		return -ENOMEM;
	}

	if (filtered_pids) {
		/* copy the current bits to the new max */
		for_each_set_bit(pid, filtered_pids->pids,
				 filtered_pids->pid_max) {
			set_bit(pid, pid_list->pids);
			nr_pids++;
		}
	}

	while (cnt > 0) {

		pos = 0;

		ret = trace_get_user(&parser, ubuf, cnt, &pos);
		if (ret < 0 || !trace_parser_loaded(&parser))
			break;

		read += ret;
		ubuf += ret;
		cnt -= ret;

		parser.buffer[parser.idx] = 0;

		ret = -EINVAL;
		if (kstrtoul(parser.buffer, 0, &val))
			break;
		if (val >= pid_list->pid_max)
			break;

		pid = (pid_t)val;

		set_bit(pid, pid_list->pids);
		nr_pids++;

		trace_parser_clear(&parser);
		ret = 0;
	}
	trace_parser_put(&parser);

	if (ret < 0) {
		trace_free_pid_list(pid_list);
		return ret;
	}

	if (!nr_pids) {
		/* Cleared the list of pids */
		trace_free_pid_list(pid_list);
		read = ret;
		pid_list = NULL;
	}

	*new_pid_list = pid_list;

	return read;
}

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static u64 buffer_ftrace_now(struct trace_buffer *buf, int cpu)
{
	u64 ts;

	/* Early boot up does not have a buffer yet */
	if (!buf->buffer)
		return trace_clock_local();

	ts = ring_buffer_time_stamp(buf->buffer, cpu);
	ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts);

	return ts;
}

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u64 ftrace_now(int cpu)
{
	return buffer_ftrace_now(&global_trace.trace_buffer, cpu);
}

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/**
 * tracing_is_enabled - Show if global_trace has been disabled
 *
 * Shows if the global trace has been enabled or not. It uses the
 * mirror flag "buffer_disabled" to be used in fast paths such as for
 * the irqsoff tracer. But it may be inaccurate due to races. If you
 * need to know the accurate state, use tracing_is_on() which is a little
 * slower, but accurate.
 */


int tracing_is_enabled(void)
{
	/*
         * For quick access (irqsoff uses this in fast path), just
         * return the mirror variable of the state of the ring buffer.
         * It's a little racy, but we don't really care.
         */
	smp_rmb();
	return !global_trace.buffer_disabled;
}

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/*
 * trace_buf_size is the size in bytes that is allocated
 * for a buffer. Note, the number of bytes is always rounded
 * to page size.
 *
 * This number is purposely set to a low number of 16384.
 * If the dump on oops happens, it will be much appreciated
 * to not have to wait for all that output. Anyway this can be
 * boot time and run time configurable.
 */

#define TRACE_BUF_SIZE_DEFAULT	1441792UL 
/* 16384 * 88 (sizeof(entry)) */


static unsigned long		trace_buf_size = TRACE_BUF_SIZE_DEFAULT;

/* trace_types holds a link list of available tracers. */

static struct tracer		*trace_types __read_mostly;

/*
 * trace_types_lock is used to protect the trace_types list.
 */

DEFINE_MUTEX(trace_types_lock);

/*
 * serialize the access of the ring buffer
 *
 * ring buffer serializes readers, but it is low level protection.
 * The validity of the events (which returns by ring_buffer_peek() ..etc)
 * are not protected by ring buffer.
 *
 * The content of events may become garbage if we allow other process consumes
 * these events concurrently:
 *   A) the page of the consumed events may become a normal page
 *      (not reader page) in ring buffer, and this page will be rewrited
 *      by events producer.
 *   B) The page of the consumed events may become a page for splice_read,
 *      and this page will be returned to system.
 *
 * These primitives allow multi process access to different cpu ring buffer
 * concurrently.
 *
 * These primitives don't distinguish read-only and read-consume access.
 * Multi read-only access are also serialized.
 */

#ifdef CONFIG_SMP
static DECLARE_RWSEM(all_cpu_access_lock);
static DEFINE_PER_CPU(struct mutex, cpu_access_lock);



static inline void trace_access_lock(int cpu)
{
	if (cpu == RING_BUFFER_ALL_CPUS) {
		/* gain it for accessing the whole ring buffer. */
		down_write(&all_cpu_access_lock);
	} else {
		/* gain it for accessing a cpu ring buffer. */

		/* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */
		down_read(&all_cpu_access_lock);

		/* Secondly block other access to this @cpu ring buffer. */
		mutex_lock(&per_cpu(cpu_access_lock, cpu));
	}
}

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static inline void trace_access_unlock(int cpu)
{
	if (cpu == RING_BUFFER_ALL_CPUS) {
		up_write(&all_cpu_access_lock);
	} else {
		mutex_unlock(&per_cpu(cpu_access_lock, cpu));
		up_read(&all_cpu_access_lock);
	}
}

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static inline void trace_access_lock_init(void)
{
	int cpu;

	for_each_possible_cpu(cpu)
		mutex_init(&per_cpu(cpu_access_lock, cpu));
}

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#else

static DEFINE_MUTEX(access_lock);



static inline void trace_access_lock(int cpu)
{
	(void)cpu;
	mutex_lock(&access_lock);
}

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static inline void trace_access_unlock(int cpu)
{
	(void)cpu;
	mutex_unlock(&access_lock);
}

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static inline void trace_access_lock_init(void)
{
}

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#endif

#ifdef CONFIG_STACKTRACE
static void __ftrace_trace_stack(struct ring_buffer *buffer,
				 unsigned long flags,
				 int skip, int pc, struct pt_regs *regs);
static inline void ftrace_trace_stack(struct trace_array *tr,
				      struct ring_buffer *buffer,
				      unsigned long flags,
				      int skip, int pc, struct pt_regs *regs);

#else


static inline void __ftrace_trace_stack(struct ring_buffer *buffer,
					unsigned long flags,
					int skip, int pc, struct pt_regs *regs)
{
}
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static inline void ftrace_trace_stack(struct trace_array *tr,
				      struct ring_buffer *buffer,
				      unsigned long flags,
				      int skip, int pc, struct pt_regs *regs)
{
}

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#endif


static __always_inline void

trace_event_setup(struct ring_buffer_event *event,
		  int type, unsigned long flags, int pc)
{
	struct trace_entry *ent = ring_buffer_event_data(event);

	tracing_generic_entry_update(ent, flags, pc);
	ent->type = type;
}

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static __always_inline struct ring_buffer_event *

__trace_buffer_lock_reserve(struct ring_buffer *buffer,
			  int type,
			  unsigned long len,
			  unsigned long flags, int pc)
{
        struct ring_buffer_event *event;

	event = ring_buffer_lock_reserve(buffer, len);
	if (event != NULL)
		trace_event_setup(event, type, flags, pc);

	return event;

}

static 
void tracer_tracing_on(struct trace_array *tr)
{
	if (tr->trace_buffer.buffer)
		ring_buffer_record_on(tr->trace_buffer.buffer);
	/*
         * This flag is looked at when buffers haven't been allocated
         * yet, or by some tracers (like irqsoff), that just want to
         * know if the ring buffer has been disabled, but it can handle
         * races of where it gets disabled but we still do a record.
         * As the check is in the fast path of the tracers, it is more
         * important to be fast than accurate.
         */
	tr->buffer_disabled = 0;
	/* Make the flag seen by readers */
	smp_wmb();
}

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/**
 * tracing_on - enable tracing buffers
 *
 * This function enables tracing buffers that may have been
 * disabled with tracing_off.
 */


void tracing_on(void)
{
	tracer_tracing_on(&global_trace);
}
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EXPORT_SYMBOL_GPL(tracing_on);



static __always_inline void

__buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event)
{
	__this_cpu_write(trace_cmdline_save, true);

	/* If this is the temp buffer, we need to commit fully */
	if (this_cpu_read(trace_buffered_event) == event) {
		/* Length is in event->array[0] */
		ring_buffer_write(buffer, event->array[0], &event->array[1]);
		/* Release the temp buffer */
		this_cpu_dec(trace_buffered_event_cnt);
	} else
		ring_buffer_unlock_commit(buffer, event);
}

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/**
 * __trace_puts - write a constant string into the trace buffer.
 * @ip:    The address of the caller
 * @str:   The constant string to write
 * @size:  The size of the string.
 */


int __trace_puts(unsigned long ip, const char *str, int size)
{
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct print_entry *entry;
	unsigned long irq_flags;
	int alloc;
	int pc;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	pc = preempt_count();

	if (unlikely(tracing_selftest_running || tracing_disabled))
		return 0;

	alloc = sizeof(*entry) + size + 2; /* possible \n added */

	local_save_flags(irq_flags);
	buffer = global_trace.trace_buffer.buffer;
	event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, 
					    irq_flags, pc);
	if (!event)
		return 0;

	entry = ring_buffer_event_data(event);
	entry->ip = ip;

	memcpy(&entry->buf, str, size);

	/* Add a newline if necessary */
	if (entry->buf[size - 1] != '\n') {
		entry->buf[size] = '\n';
		entry->buf[size + 1] = '\0';
	} else
		entry->buf[size] = '\0';

	__buffer_unlock_commit(buffer, event);
	ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL);

	return size;
}
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14.61%
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EXPORT_SYMBOL_GPL(__trace_puts);

/**
 * __trace_bputs - write the pointer to a constant string into trace buffer
 * @ip:    The address of the caller
 * @str:   The constant string to write to the buffer to
 */


int __trace_bputs(unsigned long ip, const char *str)
{
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct bputs_entry *entry;
	unsigned long irq_flags;
	int size = sizeof(struct bputs_entry);
	int pc;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	pc = preempt_count();

	if (unlikely(tracing_selftest_running || tracing_disabled))
		return 0;

	local_save_flags(irq_flags);
	buffer = global_trace.trace_buffer.buffer;
	event = __trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
					    irq_flags, pc);
	if (!event)
		return 0;

	entry = ring_buffer_event_data(event);
	entry->ip			= ip;
	entry->str			= str;

	__buffer_unlock_commit(buffer, event);
	ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL);

	return 1;
}
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32
20.38%
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Tim Bird
30
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EXPORT_SYMBOL_GPL(__trace_bputs);

#ifdef CONFIG_TRACER_SNAPSHOT
/**
 * trace_snapshot - take a snapshot of the current buffer.
 *
 * This causes a swap between the snapshot buffer and the current live
 * tracing buffer. You can use this to take snapshots of the live
 * trace when some condition is triggered, but continue to trace.
 *
 * Note, make sure to allocate the snapshot with either
 * a tracing_snapshot_alloc(), or by doing it manually
 * with: echo 1 > /sys/kernel/debug/tracing/snapshot
 *
 * If the snapshot buffer is not allocated, it will stop tracing.
 * Basically making a permanent snapshot.
 */


void tracing_snapshot(void)
{
	struct trace_array *tr = &global_trace;
	struct tracer *tracer = tr->current_trace;
	unsigned long flags;

	if (in_nmi()) {
		internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n");
		internal_trace_puts("*** snapshot is being ignored        ***\n");
		return;
	}

	if (!tr->allocated_snapshot) {
		internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n");
		internal_trace_puts("*** stopping trace here!   ***\n");
		tracing_off();
		return;
	}

	/* Note, snapshot can not be used when the tracer uses it */
	if (tracer->use_max_tr) {
		internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n");
		internal_trace_puts("*** Can not use snapshot (sorry) ***\n");
		return;
	}

	local_irq_save(flags);
	update_max_tr(tr, current, smp_processor_id());
	local_irq_restore(flags);
}
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71.43%
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19
17.43%
1
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Zhao Lei
3
2.75%
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EXPORT_SYMBOL_GPL(tracing_snapshot);

static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
					struct trace_buffer *size_buf, int cpu_id);
static void set_buffer_entries(struct trace_buffer *buf, unsigned long val);



static int alloc_snapshot(struct trace_array *tr)
{
	int ret;

	if (!tr->allocated_snapshot) {

		/* allocate spare buffer */
		ret = resize_buffer_duplicate_size(&tr->max_buffer,
				   &tr->trace_buffer, RING_BUFFER_ALL_CPUS);
		if (ret < 0)
			return ret;

		tr->allocated_snapshot = true;
	}

	return 0;
}

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static void free_snapshot(struct trace_array *tr)
{
	/*
         * We don't free the ring buffer. instead, resize it because
         * The max_tr ring buffer has some state (e.g. ring->clock) and
         * we want preserve it.
         */
	ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS);
	set_buffer_entries(&tr->max_buffer, 1);
	tracing_reset_online_cpus(&tr->max_buffer);
	tr->allocated_snapshot = false;
}

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7
14.29%
1
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Li Zefan
1
2.04%
1
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Fabian Frederick
1
2.04%
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/**
 * tracing_alloc_snapshot - allocate snapshot buffer.
 *
 * This only allocates the snapshot buffer if it isn't already
 * allocated - it doesn't also take a snapshot.
 *
 * This is meant to be used in cases where the snapshot buffer needs
 * to be set up for events that can't sleep but need to be able to
 * trigger a snapshot.
 */


int tracing_alloc_snapshot(void)
{
	struct trace_array *tr = &global_trace;
	int ret;

	ret = alloc_snapshot(tr);
	WARN_ON(ret < 0);

	return ret;
}
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20
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8
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EXPORT_SYMBOL_GPL(tracing_alloc_snapshot);

/**
 * trace_snapshot_alloc - allocate and take a snapshot of the current buffer.
 *
 * This is similar to trace_snapshot(), but it will allocate the
 * snapshot buffer if it isn't already allocated. Use this only
 * where it is safe to sleep, as the allocation may sleep.
 *
 * This causes a swap between the snapshot buffer and the current live
 * tracing buffer. You can use this to take snapshots of the live
 * trace when some condition is triggered, but continue to trace.
 */


void tracing_snapshot_alloc(void)
{
	int ret;

	ret = tracing_alloc_snapshot();
	if (ret < 0)
		return;

	tracing_snapshot();
}
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EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
#else


void tracing_snapshot(void)
{
	WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used");
}
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EXPORT_SYMBOL_GPL(tracing_snapshot);


int tracing_alloc_snapshot(void)
{
	WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used");
	return -ENODEV;
}
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EXPORT_SYMBOL_GPL(tracing_alloc_snapshot);


void tracing_snapshot_alloc(void)
{
	/* Give warning */
	tracing_snapshot();
}
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EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
#endif /* CONFIG_TRACER_SNAPSHOT */



static void tracer_tracing_off(struct trace_array *tr)
{
	if (tr->trace_buffer.buffer)
		ring_buffer_record_off(tr->trace_buffer.buffer);
	/*
         * This flag is looked at when buffers haven't been allocated
         * yet, or by some tracers (like irqsoff), that just want to
         * know if the ring buffer has been disabled, but it can handle
         * races of where it gets disabled but we still do a record.
         * As the check is in the fast path of the tracers, it is more
         * important to be fast than accurate.
         */
	tr->buffer_disabled = 1;
	/* Make the flag seen by readers */
	smp_wmb();
}

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83.33%
Jiri Olsa
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7.69%
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/**
 * tracing_off - turn off tracing buffers
 *
 * This function stops the tracing buffers from recording data.
 * It does not disable any overhead the tracers themselves may
 * be causing. This function simply causes all recording to
 * the ring buffers to fail.
 */


void tracing_off(void)
{
	tracer_tracing_off(&global_trace);
}
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EXPORT_SYMBOL_GPL(tracing_off);



void disable_trace_on_warning(void)
{
	if (__disable_trace_on_warning)
		tracing_off();
}

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/**
 * tracer_tracing_is_on - show real state of ring buffer enabled
 * @tr : the trace array to know if ring buffer is enabled
 *
 * Shows real state of the ring buffer if it is enabled or not.
 */


int tracer_tracing_is_on(struct trace_array *tr)
{
	if (tr->trace_buffer.buffer)
		return ring_buffer_record_is_on(tr->trace_buffer.buffer);
	return !tr->buffer_disabled;
}

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/**
 * tracing_is_on - show state of ring buffers enabled
 */


int tracing_is_on(void)
{
	return tracer_tracing_is_on(&global_trace);
}
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EXPORT_SYMBOL_GPL(tracing_is_on);



static int __init set_buf_size(char *str)
{
	unsigned long buf_size;

	if (!str)
		return 0;
	buf_size = memparse(str, &str);
	/* nr_entries can not be zero */
	if (buf_size == 0)
		return 0;
	trace_buf_size = buf_size;
	return 1;
}
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__setup("trace_buf_size=", set_buf_size);



static int __init set_tracing_thresh(char *str)
{
	unsigned long threshold;
	int ret;

	if (!str)
		return 0;
	ret = kstrtoul(str, 0, &threshold);
	if (ret < 0)
		return 0;
	tracing_thresh = threshold * 1000;
	return 1;
}
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20.00%
Eduard - Gabriel Munteanu
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32.14%
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20.00%
Wang Tianhong
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5.36%
1
20.00%
Daniel Walter
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1.79%
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20.00%
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__setup("tracing_thresh=", set_tracing_thresh);



unsigned long nsecs_to_usecs(unsigned long nsecs)
{
	return nsecs / 1000;
}

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/*
 * TRACE_FLAGS is defined as a tuple matching bit masks with strings.
 * It uses C(a, b) where 'a' is the enum name and 'b' is the string that
 * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list
 * of strings in the order that the enums were defined.
 */

#undef C

#define C(a, b) b

/* These must match the bit postions in trace_iterator_flags */

static const char *trace_options[] = {
	TRACE_FLAGS
	NULL
};

static struct {
	
u64 (*func)(void);
	
const char *name;
	
int in_ns;		/* is this clock in nanoseconds? */
} 
trace_clocks[] = {
	{ trace_clock_local,		"local",	1 },
	{ trace_clock_global,		"global",	1 },
	{ trace_clock_counter,		"counter",	0 },
	{ trace_clock_jiffies,		"uptime",	0 },
	{ trace_clock,			"perf",		1 },
	{ ktime_get_mono_fast_ns,	"mono",		1 },
	{ ktime_get_raw_fast_ns,	"mono_raw",	1 },
	{ ktime_get_boot_fast_ns,	"boot",		1 },
	ARCH_TRACE_CLOCKS
};

/*
 * trace_parser_get_init - gets the buffer for trace parser
 */


int trace_parser_get_init(struct trace_parser *parser, int size)
{
	memset(parser, 0, sizeof(*parser));

	parser->buffer = kmalloc(size, GFP_KERNEL);
	if (!parser->buffer)
		return 1;

	parser->size = size;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Olsa
34
60.71%
1
50.00%
Steven Rostedt
22
39.29%
1
50.00%
Total
56
100.00%
2
100.00%

/*
 * trace_parser_put - frees the buffer for trace parser
 */


void trace_parser_put(struct trace_parser *parser)
{
	kfree(parser->buffer);
	parser->buffer = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ingo Molnar
10
43.48%
1
25.00%
Steven Rostedt
8
34.78%
2
50.00%
Jiri Olsa
5
21.74%
1
25.00%
Total
23
100.00%
4
100.00%

/*
 * trace_get_user - reads the user input string separated by  space
 * (matched by isspace(ch))
 *
 * For each string found the 'struct trace_parser' is updated,
 * and the function returns.
 *
 * Returns number of bytes read.
 *
 * See kernel/trace/trace.h for 'struct trace_parser' details.
 */


int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
	size_t cnt, loff_t *ppos)
{
	char ch;
	size_t read = 0;
	ssize_t ret;

	if (!*ppos)
		trace_parser_clear(parser);

	ret = get_user(ch, ubuf++);
	if (ret)
		goto out;

	read++;
	cnt--;

	/*
         * The parser is not finished with the last write,
         * continue reading the user input without skipping spaces.
         */
	if (!parser->cont) {
		/* skip white space */
		while (cnt && isspace(ch)) {
			ret = get_user(ch, ubuf++);
			if (ret)
				goto out;
			read++;
			cnt--;
		}

		/* only spaces were written */
		if (isspace(ch)) {
			*ppos += read;
			ret = read;
			goto out;
		}

		parser->idx = 0;
	}

	/* read the non-space input */
	while (cnt && !isspace(ch)) {
		if (parser->idx < parser->size - 1)
			parser->buffer[parser->idx++] = ch;
		else {
			ret = -EINVAL;
			goto out;
		}
		ret = get_user(ch, ubuf++);
		if (ret)
			goto out;
		read++;
		cnt--;
	}

	/* We either got finished input or we have to wait for another call. */
	if (isspace(ch)) {
		parser->buffer[parser->idx] = 0;
		parser->cont = false;
	} else if (parser->idx < parser->size - 1) {
		parser->cont = true;
		parser->buffer[parser->idx++] = ch;
	} else {
		ret = -EINVAL;
		goto out;
	}

	*ppos += read;
	ret = read;

out:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Olsa
182
61.28%
1
6.25%
Steven Rostedt
66
22.22%
6
37.50%
Pekka Paalanen
18
6.06%
1
6.25%
Ingo Molnar
12
4.04%
1
6.25%
Li Zefan
7
2.36%
2
12.50%
Török Edwin
4
1.35%
1
6.25%
Frédéric Weisbecker
4
1.35%
1
6.25%
Harvey Harrison
2
0.67%
1
6.25%
Motohiro Kosaki
1
0.34%
1
6.25%
Hiraku Toyooka
1
0.34%
1
6.25%
Total
297
100.00%
16
100.00%

/* TODO add a seq_buf_to_buffer() */


static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
{
	int len;

	if (trace_seq_used(s) <= s->seq.readpos)
		return -EBUSY;

	len = trace_seq_used(s) - s->seq.readpos;
	if (cnt > len)
		cnt = len;
	memcpy(buf, s->buffer + s->seq.readpos, cnt);

	s->seq.readpos += cnt;
	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduard - Gabriel Munteanu
55
61.80%
1
9.09%
Steven Rostedt
26
29.21%
7
63.64%
Hiraku Toyooka
6
6.74%
1
9.09%
Dmitri Vorobiev
1
1.12%
1
9.09%
Vaibhav Nagarnaik
1
1.12%
1
9.09%
Total
89
100.00%
11
100.00%


unsigned long __read_mostly	tracing_thresh;

#ifdef CONFIG_TRACER_MAX_TRACE
/*
 * Copy the new maximum trace into the separate maximum-trace
 * structure. (this way the maximum trace is permanently saved,
 * for later retrieval via /sys/kernel/debug/tracing/latency_trace)
 */

static void

__update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct trace_buffer *trace_buf = &tr->trace_buffer;
	struct trace_buffer *max_buf = &tr->max_buffer;
	struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu);
	struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu);

	max_buf->cpu = cpu;
	max_buf->time_start = data->preempt_timestamp;

	max_data->saved_latency = tr->max_latency;
	max_data->critical_start = data->critical_start;
	max_data->critical_end = data->critical_end;

	memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN);
	max_data->pid = tsk->pid;
	/*
         * If tsk == current, then use current_uid(), as that does not use
         * RCU. The irq tracer can be called out of RCU scope.
         */
	if (tsk == current)
		max_data->uid = current_uid();
	else
		max_data->uid = task_uid(tsk);

	max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
	max_data->policy = tsk->policy;
	max_data->rt_priority = tsk->rt_priority;

	/* record this tasks comm */
	tracing_record_cmdline(tsk);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
178
96.74%
11
73.33%
Ingo Molnar
5
2.72%
3
20.00%
Arnaldo Carvalho de Melo
1
0.54%
1
6.67%
Total
184
100.00%
15
100.00%

/**
 * update_max_tr - snapshot all trace buffers from global_trace to max_tr
 * @tr: tracer
 * @tsk: the task with the latency
 * @cpu: The cpu that initiated the trace.
 *
 * Flip the buffers between the @tr and the max_tr and record information
 * about which task was the cause of this latency.
 */

void

update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct ring_buffer *buf;

	if (tr->stop_count)
		return;

	WARN_ON_ONCE(!irqs_disabled());

	if (!tr->allocated_snapshot) {
		/* Only the nop tracer should hit this when disabling */
		WARN_ON_ONCE(tr->current_trace != &nop_trace);
		return;
	}

	arch_spin_lock(&tr->max_lock);

	buf = tr->trace_buffer.buffer;
	tr->trace_buffer.buffer = tr->max_buffer.buffer;
	tr->max_buffer.buffer = buf;

	__update_max_tr(tr, tsk, cpu);
	arch_spin_unlock(&tr->max_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
85
76.58%
8
66.67%
Ingo Molnar
10
9.01%
1
8.33%
Hiraku Toyooka
8
7.21%
1
8.33%
Motohiro Kosaki
6
5.41%
1
8.33%
Thomas Gleixner
2
1.80%
1
8.33%
Total
111
100.00%
12
100.00%

/**
 * update_max_tr_single - only copy one trace over, and reset the rest
 * @tr - tracer
 * @tsk - task with the latency
 * @cpu - the cpu of the buffer to copy.
 *
 * Flip the trace of a single CPU buffer between the @tr and the max_tr.
 */

void

update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	int ret;

	if (tr->stop_count)
		return;

	WARN_ON_ONCE(!irqs_disabled());
	if (!tr->allocated_snapshot) {
		/* Only the nop tracer should hit this when disabling */
		WARN_ON_ONCE(tr->current_trace != &nop_trace);
		return;
	}

	arch_spin_lock(&tr->max_lock);

	ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu);

	if (ret == -EBUSY) {
		/*
                 * We failed to swap the buffer due to a commit taking
                 * place on this CPU. We fail to record, but we reset
                 * the max trace buffer (no one writes directly to it)
                 * and flag that it failed.
                 */
		trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_,
			"Failed to swap buffers due to commit in progress\n");
	}

	WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY);

	__update_max_tr(tr, tsk, cpu);
	arch_spin_unlock(&tr->max_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
99
71.74%
12
57.14%
Ingo Molnar
19
13.77%
3
14.29%
Linus Torvalds
9
6.52%
1
4.76%
Motohiro Kosaki
3
2.17%
1
4.76%
Harvey Harrison
3
2.17%
1
4.76%
Thomas Gleixner
2
1.45%
1
4.76%
Török Edwin
2
1.45%
1
4.76%
Hiraku Toyooka
1
0.72%
1
4.76%
Total
138
100.00%
21
100.00%

#endif /* CONFIG_TRACER_MAX_TRACE */



static int wait_on_pipe(struct trace_iterator *iter, bool full)
{
	/* Iterators are static, they should be filled or empty */
	if (trace_buffer_iter(iter, iter->cpu_file))
		return 0;

	return ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file,
				full);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
40
88.89%
6
85.71%
Rabin Vincent
5
11.11%
1
14.29%
Total
45
100.00%
7
100.00%

#ifdef CONFIG_FTRACE_STARTUP_TEST


static int run_tracer_selftest(struct tracer *type)
{
	struct trace_array *tr = &global_trace;
	struct tracer *saved_tracer = tr->current_trace;
	int ret;

	if (!type->selftest || tracing_selftest_disabled)
		return 0;

	/*
         * Run a selftest on this tracer.
         * Here we reset the trace buffer, and set the current
         * tracer to be this tracer. The tracer can then run some
         * internal tracing to verify that everything is in order.
         * If we fail, we do not register this tracer.
         */
	tracing_reset_online_cpus(&tr->trace_buffer);

	tr->current_trace = type;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (type->use_max_tr) {
		/* If we expanded the buffers, make sure the max is expanded too */
		if (ring_buffer_expanded)
			ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size,
					   RING_BUFFER_ALL_CPUS);
		tr->allocated_snapshot = true;
	}
#endif

	/* the test is responsible for initializing and enabling */
	pr_info("Testing tracer %s: ", type->name);
	ret = type->selftest(type, tr);
	/* the test is responsible for resetting too */
	tr->current_trace = saved_tracer;
	if (ret) {
		printk(KERN_CONT "FAILED!\n");
		/* Add the warning after printing 'FAILED' */
		WARN_ON(1);
		return -1;
	}
	/* Only reset on passing, to avoid touching corrupted buffers */
	tracing_reset_online_cpus(&tr->trace_buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	if (type->use_max_tr) {
		tr->allocated_snapshot = false;

		/* Shrink the max buffer again */
		if (ring_buffer_expanded)
			ring_buffer_resize(tr->max_buffer.buffer, 1,
					   RING_BUFFER_ALL_CPUS);
	}
#endif

	printk(KERN_CONT "PASSED\n");
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
184
92.00%
7
58.33%
Ingo Molnar
10
5.00%
2
16.67%
Peter Zijlstra
3
1.50%
2
16.67%
Török Edwin
3
1.50%
1
8.33%
Total
200
100.00%
12
100.00%

#else


static inline int run_tracer_selftest(struct tracer *type)
{
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%

#endif /* CONFIG_FTRACE_STARTUP_TEST */

static void add_tracer_options(struct trace_array *tr, struct tracer *t);

static void __init apply_trace_boot_options(void);

/**
 * register_tracer - register a tracer with the ftrace system.
 * @type - the plugin for the tracer
 *
 * Register a new plugin tracer.
 */


int __init register_tracer(struct tracer *type)
{
	struct tracer *t;
	int ret = 0;

	if (!type->name) {
		pr_info("Tracer must have a name\n");
		return -1;
	}

	if (strlen(type->name) >= MAX_TRACER_SIZE) {
		pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE);
		return -1;
	}

	mutex_lock(&trace_types_lock);

	tracing_selftest_running = true;

	for (t = trace_types; t; t = t->next) {
		if (strcmp(type->name, t->name) == 0) {
			/* already found */
			pr_info("Tracer %s already registered\n",
				type->name);
			ret = -1;
			goto out;
		}
	}

	if (!type->set_flag)
		type->set_flag = &dummy_set_flag;
	if (!type->flags) {
		/*allocate a dummy tracer_flags*/
		type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
		if (!type->flags) {
			ret = -ENOMEM;
			goto out;
		}
		type->flags->val = 0;
		type->flags->opts = dummy_tracer_opt;
	} else
		if (!type->flags->opts)
			type->flags->opts = dummy_tracer_opt;

	/* store the tracer for __set_tracer_option */
	type->flags->trace = type;

	ret = run_tracer_selftest(type);
	if (ret < 0)
		goto out;

	type->next = trace_types;
	trace_types = type;
	add_tracer_options(&global_trace, type);

 out:
	tracing_selftest_running = false;
	mutex_unlock(&trace_types_lock);

	if (ret || !default_bootup_tracer)
		goto out_unlock;

	if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE))
		goto out_unlock;

	printk(KERN_INFO "Starting tracer '%s'\n", type->name);
	/* Do we want this tracer to start on bootup? */
	tracing_set_tracer(&global_trace, type->name);
	default_bootup_tracer = NULL;

	apply_trace_boot_options();

	/* disable other selftests, since this will break it. */
	tracing_selftest_disabled = true;
#ifdef CONFIG_FTRACE_STARTUP_TEST
	printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
	       type->name);
#endif

 out_unlock:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
223
63.71%
17
51.52%
Chunyu Hu
56
16.00%
2
6.06%
Li Zefan
18
5.14%
1
3.03%
Pekka Paalanen
14
4.00%
1
3.03%
Ingo Molnar
13
3.71%
4
12.12%
Török Edwin
10
2.86%
2
6.06%
Frédéric Weisbecker
6
1.71%
2
6.06%
Thomas Gleixner
4
1.14%
1
3.03%
Jiaxing Wang
4
1.14%
1
3.03%
Heiko Carstens
1
0.29%
1
3.03%
Dan Carpenter
1
0.29%
1
3.03%
Total
350
100.00%
33
100.00%



void tracing_reset(struct trace_buffer *buf, int cpu)
{
	struct ring_buffer *buffer = buf->buffer;

	if (!buffer)
		return;

	ring_buffer_record_disable(buffer);

	/* Make sure all commits have finished */
	synchronize_sched();
	ring_buffer_reset_cpu(buffer, cpu);

	ring_buffer_record_enable(buffer);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
40
81.63%
10
83.33%
Ingo Molnar
8
16.33%
1
8.33%
Hiraku Toyooka
1
2.04%
1
8.33%
Total
49
100.00%
12
100.00%



void tracing_reset_online_cpus(struct trace_buffer *buf)
{
	struct ring_buffer *buffer = buf->buffer;
	int cpu;

	if (!buffer)
		return;

	ring_buffer_record_disable(buffer);

	/* Make sure all commits have finished */
	synchronize_sched();

	buf->time_start = buffer_ftrace_now(buf, buf->cpu);

	for_each_online_cpu(cpu)
		ring_buffer_reset_cpu(buffer, cpu);

	ring_buffer_record_enable(buffer);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
31
46.97%
5
41.67%
Ingo Molnar
15
22.73%
3
25.00%
Arnaldo Carvalho de Melo
9
13.64%
1
8.33%
Hiraku Toyooka
6
9.09%
1
8.33%
Alexander Z Lam
3
4.55%
1
8.33%
Frédéric Weisbecker
2
3.03%
1
8.33%
Total
66
100.00%
12
100.00%

/* Must have trace_types_lock held */


void tracing_reset_all_online_cpus(void)
{
	struct trace_array *tr;

	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		tracing_reset_online_cpus(&tr->trace_buffer);
#ifdef CONFIG_TRACER_MAX_TRACE
		tracing_reset_online_cpus(&tr->max_buffer);
#endif
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
28
65.12%
3
60.00%
Arnaldo Carvalho de Melo
11
25.58%
1
20.00%
Frédéric Weisbecker
4
9.30%
1
20.00%
Total
43
100.00%
5
100.00%


#define SAVED_CMDLINES_DEFAULT 128

#define NO_CMDLINE_MAP UINT_MAX

static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED;

struct saved_cmdlines_buffer {
	
unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
	
unsigned *map_cmdline_to_pid;
	
unsigned cmdline_num;
	
int cmdline_idx;
	
char *saved_cmdlines;
};

static struct saved_cmdlines_buffer *savedcmd;

/* temporary disable recording */

static atomic_t trace_record_cmdline_disabled __read_mostly;



static inline char *get_saved_cmdlines(int idx)
{
	return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN];
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
20
90.91%
1
50.00%
Steven Rostedt
2
9.09%
1
50.00%
Total
22
100.00%
2
100.00%



static inline void set_cmdline(int idx, const char *cmdline)
{
	memcpy(get_saved_cmdlines(idx), cmdline, TASK_COMM_LEN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
26
96.30%
1
50.00%
Steven Rostedt
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%



static int allocate_cmdlines_buffer(unsigned int val,
				    struct saved_cmdlines_buffer *s)
{
	s->map_cmdline_to_pid = kmalloc(val * sizeof(*s->map_cmdline_to_pid),
					GFP_KERNEL);
	if (!s->map_cmdline_to_pid)
		return -ENOMEM;

	s->saved_cmdlines = kmalloc(val * TASK_COMM_LEN, GFP_KERNEL);
	if (!s->saved_cmdlines) {
		kfree(s->map_cmdline_to_pid);
		return -ENOMEM;
	}

	s->cmdline_idx = 0;
	s->cmdline_num = val;
	memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP,
	       sizeof(s->map_pid_to_cmdline));
	memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP,
	       val * sizeof(*s->map_cmdline_to_pid));

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
102
79.07%
1
14.29%
Steven Rostedt
20
15.50%
3
42.86%
Ingo Molnar
4
3.10%
1
14.29%
Thomas Gleixner
2
1.55%
1
14.29%
Török Edwin
1
0.78%
1
14.29%
Total
129
100.00%
7
100.00%



static int trace_create_savedcmd(void)
{
	int ret;

	savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL);
	if (!savedcmd)
		return -ENOMEM;

	ret = allocate_cmdlines_buffer(SAVED_CMDLINES_DEFAULT, savedcmd);
	if (ret < 0) {
		kfree(savedcmd);
		savedcmd = NULL;
		return -ENOMEM;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
60
90.91%
1
20.00%
Steven Rostedt
2
3.03%
1
20.00%
Ingo Molnar
2
3.03%
2
40.00%
Namhyung Kim
2
3.03%
1
20.00%
Total
66
100.00%
5
100.00%



int is_tracing_stopped(void)
{
	return global_trace.stop_count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Carsten Emde
7
58.33%
1
33.33%
Steven Rostedt
5
41.67%
2
66.67%
Total
12
100.00%
3
100.00%

/**
 * tracing_start - quick start of the tracer
 *
 * If tracing is enabled but was stopped by tracing_stop,
 * this will start the tracer back up.
 */


void tracing_start(void)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	if (tracing_disabled)
		return;

	raw_spin_lock_irqsave(&global_trace.start_lock, flags);
	if (--global_trace.stop_count) {
		if (global_trace.stop_count < 0) {
			/* Someone screwed up their debugging */
			WARN_ON_ONCE(1);
			global_trace.stop_count = 0;
		}
		goto out;
	}

	/* Prevent the buffers from switching */
	arch_spin_lock(&global_trace.max_lock);

	buffer = global_trace.trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_enable(buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	buffer = global_trace.max_buffer.buffer;
	if (buffer)
		ring_buffer_record_enable(buffer);
#endif

	arch_spin_unlock(&global_trace.max_lock);

 out:
	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
111
83.46%
13
68.42%
Masami Hiramatsu
14
10.53%
1
5.26%
Peter Zijlstra
3
2.26%
2
10.53%
Thomas Gleixner
2
1.50%
1
5.26%
Frédéric Weisbecker
2
1.50%
1
5.26%
Ingo Molnar
1
0.75%
1
5.26%
Total
133
100.00%
19
100.00%



static void tracing_start_tr(struct trace_array *tr)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	if (tracing_disabled)
		return;

	/* If global, we need to also start the max tracer */
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
		return tracing_start();

	raw_spin_lock_irqsave(&tr->start_lock, flags);

	if (--tr->stop_count) {
		if (tr->stop_count < 0) {
			/* Someone screwed up their debugging */
			WARN_ON_ONCE(1);
			tr->stop_count = 0;
		}
		goto out;
	}

	buffer = tr->trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_enable(buffer);

 out:
	raw_spin_unlock_irqrestore(&tr->start_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
92
82.88%
7
53.85%
Ingo Molnar
11
9.91%
3
23.08%
Tom Zanussi
4
3.60%
1
7.69%
Török Edwin
2
1.80%
1
7.69%
Arnaldo Carvalho de Melo
2
1.80%
1
7.69%
Total
111
100.00%
13
100.00%

/**
 * tracing_stop - quick stop of the tracer
 *
 * Light weight way to stop tracing. Use in conjunction with
 * tracing_start.
 */


void tracing_stop(void)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	raw_spin_lock_irqsave(&global_trace.start_lock, flags);
	if (global_trace.stop_count++)
		goto out;

	/* Prevent the buffers from switching */
	arch_spin_lock(&global_trace.max_lock);

	buffer = global_trace.trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_disable(buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	buffer = global_trace.max_buffer.buffer;
	if (buffer)
		ring_buffer_record_disable(buffer);
#endif

	arch_spin_unlock(&global_trace.max_lock);

 out:
	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
89
85.58%
12
75.00%
Ingo Molnar
11
10.58%
2
12.50%
Thomas Gleixner
2
1.92%
1
6.25%
Frédéric Weisbecker
2
1.92%
1
6.25%
Total
104
100.00%
16
100.00%



static void tracing_stop_tr(struct trace_array *tr)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	/* If global, we need to also stop the max tracer */
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
		return tracing_stop();

	raw_spin_lock_irqsave(&tr->start_lock, flags);
	if (tr->stop_count++)
		goto out;

	buffer = tr->trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_disable(buffer);

 out:
	raw_spin_unlock_irqrestore(&tr->start_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
74
90.24%
6
75.00%
Ingo Molnar
7
8.54%
1
12.50%
Tom Zanussi
1
1.22%
1
12.50%
Total
82
100.00%
8
100.00%

void trace_stop_cmdline_recording(void);



static int trace_save_cmdline(struct task_struct *tsk)
{
	unsigned pid, idx;

	if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
		return 0;

	/*
         * It's not the end of the world if we don't get
         * the lock, but we also don't want to spin
         * nor do we want to disable interrupts,
         * so if we miss here, then better luck next time.
         */
	if (!arch_spin_trylock(&trace_cmdline_lock))
		return 0;

	idx = savedcmd->map_pid_to_cmdline[tsk->pid];
	if (idx == NO_CMDLINE_MAP) {
		idx = (savedcmd->cmdline_idx + 1) % savedcmd->cmdline_num;

		/*
                 * Check whether the cmdline buffer at idx has a pid
                 * mapped. We are going to overwrite that entry so we
                 * need to clear the map_pid_to_cmdline. Otherwise we
                 * would read the new comm for the old pid.
                 */
		pid = savedcmd->map_cmdline_to_pid[idx];
		if (pid != NO_CMDLINE_MAP)
			savedcmd->map_pid_to_cmdline[pid] = NO_CMDLINE_MAP;

		savedcmd->map_cmdline_to_pid[idx] = tsk->pid;
		savedcmd->map_pid_to_cmdline[tsk->pid] = idx;

		savedcmd->cmdline_idx = idx;
	}

	set_cmdline(idx, tsk->comm);

	arch_spin_unlock(&trace_cmdline_lock);

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
81
53.29%
5
33.33%
Ingo Molnar
18
11.84%
3
20.00%
Yoshihiro Yunomae
18
11.84%
1
6.67%
Carsten Emde
13
8.55%
1
6.67%
Frédéric Weisbecker
13
8.55%
1
6.67%
Thomas Gleixner
7
4.61%
2
13.33%
Peter Zijlstra
1
0.66%
1
6.67%
Török Edwin
1
0.66%
1
6.67%
Total
152
100.00%
15
100.00%



static void __trace_find_cmdline(int pid, char comm[])
{
	unsigned map;

	if (!pid) {
		strcpy(comm, "<idle>");
		return;
	}

	if (WARN_ON_ONCE(pid < 0)) {
		strcpy(comm, "<XXX>");
		return;
	}

	if (pid > PID_MAX_DEFAULT) {
		strcpy(comm, "<...>");
		return;
	}

	map = savedcmd->map_pid_to_cmdline[pid];
	if (map != NO_CMDLINE_MAP)
		strcpy(comm, get_saved_cmdlines(map));
	else
		strcpy(comm, "<...>");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
75
75.76%
9
56.25%
Masami Hiramatsu
7
7.07%
1
6.25%
Thomas Gleixner
6
6.06%
2
12.50%
Yoshihiro Yunomae
5
5.05%
1
6.25%
Frédéric Weisbecker
3
3.03%
1
6.25%
Tom Zanussi
2
2.02%
1
6.25%
Ingo Molnar
1
1.01%
1
6.25%
Total
99
100.00%
16
100.00%



void trace_find_cmdline(int pid, char comm[])
{
	preempt_disable();
	arch_spin_lock(&trace_cmdline_lock);

	__trace_find_cmdline(pid, comm);

	arch_spin_unlock(&trace_cmdline_lock);
	preempt_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
35
94.59%
4
66.67%
Heiko Carstens
1
2.70%
1
16.67%
Thomas Gleixner
1
2.70%
1
16.67%
Total
37
100.00%
6
100.00%



void tracing_record_cmdline(struct task_struct *tsk)
{
	if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
		return;

	if (!__this_cpu_read(trace_cmdline_save))
		return;

	if (trace_save_cmdline(tsk))
		__this_cpu_write(trace_cmdline_save, false);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
30
65.22%
5
71.43%
Masami Hiramatsu
14
30.43%
1
14.29%
Ingo Molnar
2
4.35%
1
14.29%
Total
46
100.00%
7
100.00%


void

tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
			     int pc)
{
	struct task_struct *tsk = current;

	entry->preempt_count		= pc & 0xff;
	entry->pid			= (tsk) ? tsk->pid : 0;
	entry->flags =
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
		(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
#else
		TRACE_FLAG_IRQS_NOSUPPORT |
#endif
		((pc & NMI_MASK    ) ? TRACE_FLAG_NMI     : 0) |
		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
		((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) |
		(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
		(test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
84
67.74%
4
40.00%
Peter Zijlstra
22
17.74%
2
20.00%
Ingo Molnar
15
12.10%
2
20.00%
Al Viro
2
1.61%
1
10.00%
Pavankumar Kondeti
1
0.81%
1
10.00%
Total
124
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(tracing_generic_entry_update);


struct ring_buffer_event *

trace_buffer_lock_reserve(struct ring_buffer *buffer,
			  int type,
			  unsigned long len,
			  unsigned long flags, int pc)
{
	return __trace_buffer_lock_reserve(buffer, type, len, flags, pc);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
27
67.50%
6
66.67%
Arnaldo Carvalho de Melo
10
25.00%
1
11.11%
Török Edwin
2
5.00%
1
11.11%
Li Zefan
1
2.50%
1
11.11%
Total
40
100.00%
9
100.00%

DEFINE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
DEFINE_PER_CPU(int, trace_buffered_event_cnt);

static int trace_buffered_event_ref;

/**
 * trace_buffered_event_enable - enable buffering events
 *
 * When events are being filtered, it is quicker to use a temporary
 * buffer to write the event data into if there's a likely chance
 * that it will not be committed. The discard of the ring buffer
 * is not as fast as committing, and is much slower than copying
 * a commit.
 *
 * When an event is to be filtered, allocate per cpu buffers to
 * write the event data into, and if the event is filtered and discarded
 * it is simply dropped, otherwise, the entire data is to be committed
 * in one shot.
 */


void trace_buffered_event_enable(void)
{
	struct ring_buffer_event *event;
	struct page *page;
	int cpu;

	WARN_ON_ONCE(!mutex_is_locked(&event_mutex));

	if (trace_buffered_event_ref++)
		return;

	for_each_tracing_cpu(cpu) {
		page = alloc_pages_node(cpu_to_node(cpu),
					GFP_KERNEL | __GFP_NORETRY, 0);
		if (!page)
			goto failed;

		event = page_address(page);
		memset(event, 0, sizeof(*event));

		per_cpu(trace_buffered_event, cpu) = event;

		preempt_disable();
		if (cpu == smp_processor_id() &&
		    this_cpu_read(trace_buffered_event) !=
		    per_cpu(trace_buffered_event, cpu))
			WARN_ON_ONCE(1);
		preempt_enable();
	}

	return;
 failed:
	trace_buffered_event_disable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
126
96.18%
1
50.00%
Arnaldo Carvalho de Melo
5
3.82%
1
50.00%
Total
131
100.00%
2
100.00%



static void enable_trace_buffered_event(void *data)
{
	/* Probably not needed, but do it anyway */
	smp_rmb();
	this_cpu_dec(trace_buffered_event_cnt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



static void disable_trace_buffered_event(void *data)
{
	this_cpu_inc(trace_buffered_event_cnt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
14
93.33%
1
50.00%
Arnaldo Carvalho de Melo
1
6.67%
1
50.00%
Total
15
100.00%
2
100.00%

/**
 * trace_buffered_event_disable - disable buffering events
 *
 * When a filter is removed, it is faster to not use the buffered
 * events, and to commit directly into the ring buffer. Free up
 * the temp buffers when there are no more users. This requires
 * special synchronization with current events.
 */


void trace_buffered_event_disable(void)
{
	int cpu;

	WARN_ON_ONCE(!mutex_is_locked(&event_mutex));

	if (WARN_ON_ONCE(!trace_buffered_event_ref))
		return;

	if (--trace_buffered_event_ref)
		return;

	preempt_disable();
	/* For each CPU, set the buffer as used. */
	smp_call_function_many(tracing_buffer_mask,
			       disable_trace_buffered_event, NULL, 1);
	preempt_enable();

	/* Wait for all current users to finish */
	synchronize_sched();

	for_each_tracing_cpu(cpu) {
		free_page((unsigned long)per_cpu(trace_buffered_event, cpu));
		per_cpu(trace_buffered_event, cpu) = NULL;
	}
	/*
         * Make sure trace_buffered_event is NULL before clearing
         * trace_buffered_event_cnt.
         */
	smp_wmb();

	preempt_disable();
	/* Do the work on each cpu */
	smp_call_function_many(tracing_buffer_mask,
			       enable_trace_buffered_event, NULL, 1);
	preempt_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
100
92.59%
2
33.33%
Arnaldo Carvalho de Melo
5
4.63%
1
16.67%
Ingo Molnar
2
1.85%
2
33.33%
Török Edwin
1
0.93%
1
16.67%
Total
108
100.00%
6
100.00%


static struct ring_buffer *temp_buffer;


struct ring_buffer_event *

trace_event_buffer_lock_reserve(struct ring_buffer **current_rb,
			  struct trace_event_file *trace_file,
			  int type, unsigned long len,
			  unsigned long flags, int pc)
{
	struct ring_buffer_event *entry;
	int val;

	*current_rb = trace_file->tr->trace_buffer.buffer;

	if ((trace_file->flags &
	     (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) &&
	    (entry = this_cpu_read(trace_buffered_event))) {
		/* Try to use the per cpu buffer first */
		val = this_cpu_inc_return(trace_buffered_event_cnt);
		if (val == 1) {
			trace_event_setup(entry, type, flags, pc);
			entry->array[0] = len;
			return entry;
		}
		this_cpu_dec(trace_buffered_event_cnt);
	}

	entry = __trace_buffer_lock_reserve(*current_rb,
					    type, len, flags, pc);
	/*
         * If tracing is off, but we have triggers enabled
         * we still need to look at the event data. Use the temp_buffer
         * to store the trace event for the tigger to use. It's recusive
         * safe and will not be recorded anywhere.
         */
	if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) {
		*current_rb = temp_buffer;
		entry = __trace_buffer_lock_reserve(*current_rb,
						    type, len, flags, pc);
	}
	return entry;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
171
98.28%
13
92.86%
Ingo Molnar
3
1.72%
1
7.14%
Total
174
100.00%
14
100.00%


EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve);

static DEFINE_SPINLOCK(tracepoint_iter_lock);
static DEFINE_MUTEX(tracepoint_printk_mutex);



static void output_printk(struct trace_event_buffer *fbuffer)
{
	struct trace_event_call *event_call;
	struct trace_event *event;
	unsigned long flags;
	struct trace_iterator *iter = tracepoint_print_iter;

	/* We should never get here if iter is NULL */
	if (WARN_ON_ONCE(!iter))
		return;

	event_call = fbuffer->trace_file->event_call;
	if (!event_call || !event_call->event.funcs ||
	    !event_call->event.funcs->trace)
		return;

	event = &fbuffer->trace_file->event_call->event;

	spin_lock_irqsave(&tracepoint_iter_lock, flags);
	trace_seq_init(&iter->seq);
	iter->ent = fbuffer->entry;
	event_call->event.funcs->trace(iter, 0, event);
	trace_seq_putc(&iter->seq, 0);
	printk("%s", iter->seq.buffer);

	spin_unlock_irqrestore(&tracepoint_iter_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
130
86.09%
4
80.00%
Masami Hiramatsu
21
13.91%
1
20.00%
Total
151
100.00%
5
100.00%



int tracepoint_printk_sysctl(struct ctl_table *table, int write,
			     void __user *buffer, size_t *lenp,
			     loff_t *ppos)
{
	int save_tracepoint_printk;
	int ret;

	mutex_lock(&tracepoint_printk_mutex);
	save_tracepoint_printk = tracepoint_printk;

	ret = proc_dointvec(table, write, buffer, lenp, ppos);

	/*
         * This will force exiting early, as tracepoint_printk
         * is always zero when tracepoint_printk_iter is not allocated
         */
	if (!tracepoint_print_iter)
		tracepoint_printk = 0;

	if (save_tracepoint_printk == tracepoint_printk)
		goto out;

	if (tracepoint_printk)
		static_key_enable(&tracepoint_printk_key.key);
	else
		static_key_disable(&tracepoint_printk_key.key);

 out:
	mutex_unlock(&tracepoint_printk_mutex);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
107
99.07%
4
80.00%
Ingo Molnar
1
0.93%
1
20.00%
Total
108
100.00%
5
100.00%



void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
{
	if (static_key_false(&tracepoint_printk_key.key))
		output_printk(fbuffer);

	event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer,
				    fbuffer->event, fbuffer->entry,
				    fbuffer->flags, fbuffer->pc);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
52
100.00%
1
100.00%
Total
52
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(trace_event_buffer_commit);



void trace_buffer_unlock_commit_regs(struct trace_array *tr,
				     struct ring_buffer *buffer,
				     struct ring_buffer_event *event,
				     unsigned long flags, int pc,
				     struct pt_regs *regs)
{
	__buffer_unlock_commit(buffer, event);

	/*
         * If regs is not set, then skip the following callers:
         *   trace_buffer_unlock_commit_regs
         *   event_trigger_unlock_commit
         *   trace_event_buffer_commit
         *   trace_event_raw_event_sched_switch
         * Note, we can still get here via blktrace, wakeup tracer
         * and mmiotrace, but that's ok if they lose a function or
         * two. They are that meaningful.
         */
	ftrace_trace_stack(tr, buffer, flags, regs ? 0 : 4, pc, regs);
	ftrace_trace_userstack(buffer, flags, pc);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Masami Hiramatsu
43
63.24%
1
11.11%
Steven Rostedt
25
36.76%
8
88.89%
Total
68
100.00%
9
100.00%

/*
 * Similar to trace_buffer_unlock_commit_regs() but do not dump stack.
 */

void

trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
				   struct ring_buffer_event *event)
{
	__buffer_unlock_commit(buffer, event);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%


static void

trace_process_export(struct trace_export *export,
	       struct ring_buffer_event *event)
{
	struct trace_entry *entry;
	unsigned int size = 0;

	entry = ring_buffer_event_data(event);
	size = ring_buffer_event_length(event);
	export->write(entry, size);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunyan Zhang
50
100.00%
1
100.00%
Total
50
100.00%
1
100.00%

static DEFINE_MUTEX(ftrace_export_lock);


static struct trace_export __rcu *ftrace_exports_list __read_mostly;

static DEFINE_STATIC_KEY_FALSE(ftrace_exports_enabled);



static inline void ftrace_exports_enable(void)
{
	static_branch_enable(&ftrace_exports_enabled);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunyan Zhang
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static inline void ftrace_exports_disable(void)
{
	static_branch_disable(&ftrace_exports_enabled);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunyan Zhang
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



void ftrace_exports(struct ring_buffer_event *event)
{
	struct trace_export *export;

	preempt_disable_notrace();

	export = rcu_dereference_raw_notrace(ftrace_exports_list);
	while (export) {
		trace_process_export(export, event);
		export = rcu_dereference_raw_notrace(export->next);
	}

	preempt_enable_notrace();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunyan Zhang
50
100.00%
1
100.00%
Total
50
100.00%
1
100.00%


static inline void

add_trace_export(struct trace_export **list, struct trace_export *export)
{
	rcu_assign_pointer(export->next, *list);
	/*
         * We are entering export into the list but another
         * CPU might be walking that list. We need to make sure
         * the export->next pointer is valid before another CPU sees
         * the export pointer included into the list.
         */
	rcu_assign_pointer(*list, export);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunyan Zhang
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%


static inline int

rm_trace_export(struct trace_export **list, struct trace_export *export)
{
	struct trace_export **p;

	for (p = list; *p != NULL; p = &(*p)->next)
		if (*p == export)
			break;

	if (*p != export)
		return -1;

	rcu_assign_pointer(*p, (*p)->next);

	return 0;
}

Contributors
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Chunyan Zhang
80
100.00%
1
100.00%
Total
80
100.00%
1
100.00%


static inline void

add_ftrace_export(struct trace_export **list, struct trace_export *export)
{
	if (*list == NULL)
		ftrace_exports_enable();

	add_trace_export(list, export);
}

Contributors
Person
Tokens
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Commits
CommitProp
Chunyan Zhang
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%


static inline int

rm_ftrace_export(struct trace_export **list, struct trace_export *export)
{
	int ret;

	ret = rm_trace_export(list, export);
	if (*list == NULL)
		ftrace_exports_disable();

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunyan Zhang
43
100.00%
1
100.00%
Total
43
100.00%
1
100.00%



int register_ftrace_export(struct trace_export *export)
{
	if (WARN_ON_ONCE(!export->write))
		return -1;

	mutex_lock(&ftrace_export_lock);

	add_ftrace_export(&ftrace_exports_list, export);

	mutex_unlock(&ftrace_export_lock);

	return 0;
}
Contributors
Person
Tokens
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Commits
CommitProp
Chunyan Zhang
47
100.00%
1
100.00%
Total
47
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(register_ftrace_export);



int unregister_ftrace_export(struct trace_export *export)
{
	int ret;

	mutex_lock(&ftrace_export_lock);

	ret = rm_ftrace_export(&ftrace_exports_list, export);

	mutex_unlock(&ftrace_export_lock);

	return ret;
}
Contributors
Person
Tokens
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CommitProp
Chunyan Zhang
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(unregister_ftrace_export);


void

trace_function(struct trace_array *tr,
	       unsigned long ip, unsigned long parent_ip, unsigned long flags,
	       int pc)
{
	struct trace_event_call *call = &event_function;
	struct ring_buffer *buffer = tr->trace_buffer.buffer;
	struct ring_buffer_event *event;
	struct ftrace_entry *entry;

	event = __trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry),
					    flags, pc);
	if (!event)
		return;
	entry	= ring_buffer_event_data(event);
	entry->ip			= ip;
	entry->parent_ip		= parent_ip;

	if (!call_filter_check_discard(call, entry, buffer, event)) {
		if (static_branch_unlikely(&ftrace_exports_enabled))
			ftrace_exports(event);
		__buffer_unlock_commit(buffer, event);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
81
60.45%
12
57.14%
Tom Zanussi
17
12.69%
3
14.29%
Chunyan Zhang
15
11.19%
1
4.76%
Ingo Molnar
13
9.70%
3
14.29%
Arnaldo Carvalho de Melo
6
4.48%
1
4.76%
Török Edwin
2
1.49%
1
4.76%
Total
134
100.00%
21
100.00%

#ifdef CONFIG_STACKTRACE


#define FTRACE_STACK_MAX_ENTRIES (PAGE_SIZE / sizeof(unsigned long))

struct ftrace_stack {
	
unsigned long		calls[FTRACE_STACK_MAX_ENTRIES];
};

static DEFINE_PER_CPU(struct ftrace_stack, ftrace_stack);
static DEFINE_PER_CPU(int, ftrace_stack_reserve);



static void __ftrace_trace_stack(struct ring_buffer *buffer,
				 unsigned long flags,
				 int skip, int pc, struct pt_regs *regs)
{
	struct trace_event_call *call = &event_kernel_stack;
	struct ring_buffer_event *event;
	struct stack_entry *entry;
	struct stack_trace trace;
	int use_stack;
	int size = FTRACE_STACK_ENTRIES;

	trace.nr_entries	= 0;
	trace.skip		= skip;

	/*
         * Add two, for this function and the call to save_stack_trace()
         * If regs is set, then these functions will not be in the way.
         */
	if (!regs)
		trace.skip += 2;

	/*
         * Since events can happen in NMIs there's no safe way to
         * use the per cpu ftrace_stacks. We reserve it and if an interrupt
         * or NMI comes in, it will just have to use the default
         * FTRACE_STACK_SIZE.
         */
	preempt_disable_notrace();

	use_stack = __this_cpu_inc_return(ftrace_stack_reserve);
	/*
         * We don't need any atomic variables, just a barrier.
         * If an interrupt comes in, we don't care, because it would
         * have exited and put the counter back to what we want.
         * We just need a barrier to keep gcc from moving things
         * around.
         */
	barrier();
	if (use_stack == 1) {
		trace.entries		= this_cpu_ptr(ftrace_stack.calls);
		trace.max_entries	= FTRACE_STACK_MAX_ENTRIES;

		if (regs)
			save_stack_trace_regs(regs, &trace);
		else
			save_stack_trace(&trace);

		if (trace.nr_entries > size)
			size = trace.nr_entries;
	} else
		/* From now on, use_stack is a boolean */
		use_stack = 0;

	size *= sizeof(unsigned long);

	event = __trace_buffer_lock_reserve(buffer, TRACE_STACK,
					    sizeof(*entry) + size, flags, pc);
	if (!event)
		goto out;
	entry = ring_buffer_event_data(event);

	memset(&entry->caller, 0, size);

	if (use_stack)
		memcpy(&entry->caller, trace.entries,
		       trace.nr_entries * sizeof(unsigned long));
	else {
		trace.max_entries	= FTRACE_STACK_ENTRIES;
		trace.entries		= entry->caller;
		if (regs)
			save_stack_trace_regs(regs, &trace);
		else
			save_stack_trace(&trace);
	}

	entry->size = trace.nr_entries;

	if (!call_filter_check_discard(call, entry, buffer, event))
		__buffer_unlock_commit(buffer, event);

 out:
	/* Again, don't let gcc optimize things here */
	barrier();
	__this_cpu_dec(ftrace_stack_reserve);
	preempt_enable_notrace();

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
194
60.62%
17
60.71%
Frédéric Weisbecker
74
23.12%
1
3.57%
Tom Zanussi
21
6.56%
3
10.71%
Masami Hiramatsu
16
5.00%
1
3.57%
Ingo Molnar
7
2.19%
1
3.57%
Peter Zijlstra
2
0.62%
1
3.57%
Shan Wei
2
0.62%
1
3.57%
Christoph Lameter
2
0.62%
1
3.57%
Arnaldo Carvalho de Melo
1
0.31%
1
3.57%
Thomas Gleixner
1
0.31%
1
3.57%
Total
320
100.00%
28
100.00%



static inline void ftrace_trace_stack(struct trace_array *tr,
				      struct ring_buffer *buffer,
				      unsigned long flags,
				      int skip, int pc, struct pt_regs *regs)
{
	if (!(tr->trace_flags & TRACE_ITER_STACKTRACE))
		return;

	__ftrace_trace_stack(buffer, flags, skip, pc, regs);
}

Contributors
Person
Tokens
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Commits
CommitProp
Steven Rostedt
56
98.25%
6
85.71%
Masami Hiramatsu
1
1.75%
1
14.29%
Total
57
100.00%
7
100.00%



void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
		   int pc)
{
	__ftrace_trace_stack(tr->trace_buffer.buffer, flags, skip, pc, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
20
54.05%
6
50.00%
Frédéric Weisbecker
7
18.92%
1
8.33%
Török Edwin
5
13.51%
1
8.33%
Ingo Molnar
3
8.11%
3
25.00%
Masami Hiramatsu
2
5.41%
1
8.33%
Total
37
100.00%
12
100.00%

/**
 * trace_dump_stack - record a stack back trace in the trace buffer
 * @skip: Number of functions to skip (helper handlers)
 */


void trace_dump_stack(int skip)
{
	unsigned long flags;

	if (tracing_disabled || tracing_selftest_running)
		return;

	local_save_flags(flags);

	/*
         * Skip 3 more, seems to get us at the caller of
         * this function.
         */
	skip += 3;
	__ftrace_trace_stack(global_trace.trace_buffer.buffer,
			     flags, skip, preempt_count(), NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
29
61.70%
5
62.50%
Frédéric Weisbecker
11
23.40%
1
12.50%
Carsten Emde
5
10.64%
1
12.50%
Masami Hiramatsu
2
4.26%
1
12.50%
Total
47
100.00%
8
100.00%

static DEFINE_PER_CPU(int, user_stack_count);


void

ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
{
	struct trace_event_call *call = &event_user_stack;
	struct ring_buffer_event *event;
	struct userstack_entry *entry;
	struct stack_trace trace;

	if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE))
		return;

	/*
         * NMIs can not handle page faults, even with fix ups.
         * The save user stack can (and often does) fault.
         */
	if (unlikely(in_nmi()))
		return;

	/*
         * prevent recursion, since the user stack tracing may
         * trigger other kernel events.
         */
	preempt_disable();
	if (__this_cpu_read(user_stack_count))
		goto out;

	__this_cpu_inc(user_stack_count);

	event = __trace_buffer_lock_reserve(buffer, TRACE_USER_STACK,
					    sizeof(*entry), flags, pc);
	if (!event)
		goto out_drop_count;
	entry	= ring_buffer_event_data(event);

	entry->tgid		= current->tgid;
	memset(&entry->caller, 0, sizeof(entry->caller));

	trace.nr_entries	= 0;
	trace.max_entries	= FTRACE_STACK_ENTRIES;
	trace.skip		= 0;
	trace.entries		= entry->caller;

	save_stack_trace_user(&trace);
	if (!call_filter_check_discard(call, entry, buffer, event))
		__buffer_unlock_commit(buffer, event);

 out_drop_count:
	__this_cpu_dec(user_stack_count);
 out:
	preempt_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
122
59.80%
17
70.83%
Frédéric Weisbecker
51
25.00%
1
4.17%
Tom Zanussi
21
10.29%
3
12.50%
Ingo Molnar
6
2.94%
1
4.17%
Li Zefan
3
1.47%
1
4.17%
Arnaldo Carvalho de Melo
1
0.49%
1
4.17%
Total
204
100.00%
24
100.00%

#ifdef UNUSED


static void __trace_userstack(struct trace_array *tr, unsigned long flags)
{
	ftrace_trace_userstack(tr, flags, preempt_count());
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
22
88.00%
5
71.43%
Ingo Molnar
2
8.00%
1
14.29%
Hannes Eder
1
4.00%
1
14.29%
Total
25
100.00%
7
100.00%

#endif /* UNUSED */

#endif /* CONFIG_STACKTRACE */

/* created for use with alloc_percpu */

struct trace_buffer_struct {
	
int nesting;
	
char buffer[4][TRACE_BUF_SIZE];
};


static struct trace_buffer_struct *trace_percpu_buffer;

/*
 * Thise allows for lockless recording.  If we're nested too deeply, then
 * this returns NULL.
 */


static char *get_trace_buf(void)
{
	struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer);

	if (!buffer || buffer->nesting >= 4)
		return NULL;

	return &buffer->buffer[buffer->nesting++][0];
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Lutomirski
20
41.67%
1
14.29%
Steven Rostedt
16
33.33%
3
42.86%
Shan Wei
5
10.42%
1
14.29%
Frédéric Weisbecker
5
10.42%
1
14.29%
Thomas Gleixner
2
4.17%
1
14.29%
Total
48
100.00%
7
100.00%



static void put_trace_buf(void)
{
	this_cpu_dec(trace_percpu_buffer->nesting);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Lutomirski
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static int alloc_percpu_trace_buffer(void)
{
	struct trace_buffer_struct *buffers;

	buffers = alloc_percpu(struct trace_buffer_struct);
	if (WARN(!buffers, "Could not allocate percpu trace_printk buffer"))
		return -ENOMEM;

	trace_percpu_buffer = buffers;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
31
73.81%
4
66.67%
Andrew Lutomirski
8
19.05%
1
16.67%
Frédéric Weisbecker
3
7.14%
1
16.67%
Total
42
100.00%
6
100.00%


static int buffers_allocated;



void trace_printk_init_buffers(void)
{
	if (buffers_allocated)
		return;

	if (alloc_percpu_trace_buffer())
		return;

	/* trace_printk() is for debug use only. Don't use it in production. */

	pr_warn("\n");
	pr_warn("**********************************************************\n");
	pr_warn("**   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **\n");
	pr_warn("**                                                      **\n");
	pr_warn("** trace_printk() being used. Allocating extra memory.  **\n");
	pr_warn("**                                                      **\n");
	pr_warn("** This means that this is a DEBUG kernel and it is     **\n");
	pr_warn("** unsafe for production use.                           **\n");
	pr_warn("**                                                      **\n");
	pr_warn("** If you see this message and you are not debugging    **\n");
	pr_warn("** the kernel, report this immediately to your vendor!  **\n");
	pr_warn("**                                                      **\n");
	pr_warn("**   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **\n");
	pr_warn("**********************************************************\n");

	/* Expand the buffers to set size */
	tracing_update_buffers();

	buffers_allocated = 1;

	/*
         * trace_printk_init_buffers() can be called by modules.
         * If that happens, then we need to start cmdline recording
         * directly here. If the global_trace.buffer is already
         * allocated here, then this was called by module code.
         */
	if (global_trace.trace_buffer.buffer)
		tracing_start_cmdline_record();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
89
81.65%
9
75.00%
Joe Perches
14
12.84%
1
8.33%
Borislav Petkov
5
4.59%
1
8.33%
Frans Klaver
1
0.92%
1
8.33%
Total
109
100.00%
12
100.00%



void trace_printk_start_comm(void)
{
	/* Start tracing comms if trace printk is set */
	if (!buffers_allocated)
		return;
	tracing_start_cmdline_record();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
17
100.00%
5
100.00%
Total
17
100.00%
5
100.00%



static void trace_printk_start_stop_comm(int enabled)
{
	if (!buffers_allocated)
		return;

	if (enabled)
		tracing_start_cmdline_record();
	else
		tracing_stop_cmdline_record();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
26
100.00%
3
100.00%
Total
26
100.00%
3
100.00%

/**
 * trace_vbprintk - write binary msg to tracing buffer
 *
 */


int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
{
	struct trace_event_call *call = &event_bprint;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct trace_array *tr = &global_trace;
	struct bprint_entry *entry;
	unsigned long flags;
	char *tbuffer;
	int len = 0, size, pc;

	if (unlikely(tracing_selftest_running || tracing_disabled))
		return 0;

	/* Don't pollute graph traces with trace_vprintk internals */
	pause_graph_tracing();

	pc = preempt_count();
	preempt_disable_notrace();

	tbuffer = get_trace_buf();
	if (!tbuffer) {
		len = 0;
		goto out_nobuffer;
	}

	len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args);

	if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0)
		goto out;

	local_save_flags(flags);
	size = sizeof(*entry) + sizeof(u32) * len;
	buffer = tr->trace_buffer.buffer;
	event = __trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size,
					    flags, pc);
	if (!event)
		goto out;
	entry = ring_buffer_event_data(event);
	entry->ip			= ip;
	entry->fmt			= fmt;

	memcpy(entry->buf, tbuffer, sizeof(u32) * len);
	if (!call_filter_check_discard(call, entry, buffer, event)) {
		__buffer_unlock_commit(buffer, event);
		ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL);
	}

out:
	put_trace_buf();

out_nobuffer:
	preempt_enable_notrace();
	unpause_graph_tracing();

	return len;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Frédéric Weisbecker
127
44.10%
2
7.41%
Steven Rostedt
126
43.75%
18
66.67%
Tom Zanussi
15
5.21%
3
11.11%
Török Edwin
13
4.51%
2
7.41%
Andrew Lutomirski
6
2.08%
1
3.70%
Pekka Paalanen
1
0.35%
1
3.70%
Total
288
100.00%
27
100.00%


EXPORT_SYMBOL_GPL(trace_vbprintk);


static int

__trace_array_vprintk(struct ring_buffer *buffer,
		      unsigned long ip, const char *fmt, va_list args)
{
	struct trace_event_call *call = &event_print;
	struct ring_buffer_event *event;
	int len = 0, size, pc;
	struct print_entry *entry;
	unsigned long flags;
	char *tbuffer;

	if (tracing_disabled || tracing_selftest_running)
		return 0;

	/* Don't pollute graph traces with trace_vprintk internals */
	pause_graph_tracing();

	pc = preempt_count();
	preempt_disable_notrace();


	tbuffer = get_trace_buf();
	if (!tbuffer) {
		len = 0;
		goto out_nobuffer;
	}

	len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args);

	local_save_flags(flags);
	size = sizeof(*entry) + len + 1;
	event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
					    flags, pc);
	if (!event)
		goto out;
	entry = ring_buffer_event_data(event);
	entry->ip = ip;

	memcpy(&entry->buf, tbuffer, len + 1);
	if (!call_filter_check_discard(call, entry, buffer, event)) {
		__buffer_unlock_commit(buffer, event);
		ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL);
	}

out:
	put_trace_buf();

out_nobuffer:
	preempt_enable_notrace();
	unpause_graph_tracing();

	return len;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Frédéric Weisbecker
99
42.49%
3
9.38%
Steven Rostedt
90
38.63%
18
56.25%
Tom Zanussi
16
6.87%
3
9.38%
Carsten Emde
8
3.43%
1
3.12%
Török Edwin
7
3.00%
2
6.25%
Andrew Lutomirski
6
2.58%
1
3.12%
Lai Jiangshan
3
1.29%
2
6.25%
Dan Carpenter
3
1.29%
1
3.12%
Ingo Molnar
1
0.43%
1
3.12%
Total
233
100.00%
32
100.00%



int trace_array_vprintk(struct trace_array *tr,
			unsigned long ip, const char *fmt, va_list args)
{
	return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
35
92.11%
3
75.00%
Lai Jiangshan
3
7.89%
1
25.00%
Total
38
100.00%
4
100.00%



int trace_array_printk(struct trace_array *tr,
		       unsigned long ip, const char *fmt, ...)
{
	int ret;
	va_list ap;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	va_start(ap, fmt);
	ret = trace_array_vprintk(tr, ip, fmt, ap);
	va_end(ap);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
69
100.00%
3
100.00%
Total
69
100.00%
3
100.00%



int trace_array_printk_buf(struct ring_buffer *buffer,
			   unsigned long ip, const char *fmt, ...)
{
	int ret;
	va_list ap;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	va_start(ap, fmt);
	ret = __trace_array_vprintk(buffer, ip, fmt, ap);
	va_end(ap);
	return ret;
}

Contributors
Person
Tokens
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Commits
CommitProp
Steven Rostedt
69
100.00%
4
100.00%
Total
69
100.00%
4
100.00%



int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
{
	return trace_array_vprintk(&global_trace, ip, fmt, args);
}
Contributors
Person
Tokens
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CommitProp
Steven Rostedt
30
100.00%
3
100.00%
Total
30
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(trace_vprintk);



static void trace_iterator_increment(struct trace_iterator *iter)
{
	struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu);

	iter->idx++;
	if (buf_iter)
		ring_buffer_read(buf_iter, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
28
68.29%
3
60.00%
Frédéric Weisbecker
12
29.27%
1
20.00%
Ingo Molnar
1
2.44%
1
20.00%
Total
41
100.00%
5
100.00%


static struct trace_entry *

peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts,
		unsigned long *lost_events)
{
	struct ring_buffer_event *event;
	struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu);

	if (buf_iter)
		event = ring_buffer_iter_peek(buf_iter, ts);
	else
		event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts,
					 lost_events);

	if (event) {
		iter->ent_size = ring_buffer_event_length(event);
		return ring_buffer_event_data(event);
	}
	iter->ent_size = 0;
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
55
53.40%
6
75.00%
Frédéric Weisbecker
47
45.63%
1
12.50%
Thomas Gleixner
1
0.97%
1
12.50%
Total
103
100.00%
8
100.00%


static struct trace_entry *

__find_next_entry(struct trace_iterator *iter, int *ent_cpu,
		  unsigned long *missing_events, u64 *ent_ts)
{
	struct ring_buffer *buffer = iter->trace_buffer->buffer;
	struct trace_entry *ent, *next = NULL;
	unsigned long lost_events = 0, next_lost = 0;
	int cpu_file = iter->cpu_file;
	u64 next_ts = 0, ts;
	int next_cpu = -1;
	int next_size = 0;
	int cpu;

	/*
         * If we are in a per_cpu trace file, don't bother by iterating over
         * all cpu and peek directly.
         */
	if (cpu_file > RING_BUFFER_ALL_CPUS) {
		if (ring_buffer_empty_cpu(buffer, cpu_file))
			return NULL;
		ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events);
		if (ent_cpu)
			*ent_cpu = cpu_file;

		return ent;
	}

	for_each_tracing_cpu(cpu) {

		if (ring_buffer_empty_cpu(buffer, cpu))
			continue;

		ent = peek_next_entry(iter, cpu, &ts, &lost_events);

		/*
                 * Pick the entry with the smallest timestamp:
                 */
		if (ent && (!next || ts < next_ts)) {
			next = ent;
			next_cpu = cpu;
			next_ts = ts;
			next_lost = lost_events;
			next_size = iter->ent_size;
		}
	}

	iter->ent_size = next_size;

	if (ent_cpu)
		*ent_cpu = next_cpu;

	if (ent_ts)
		*ent_ts = next_ts;

	if (missing_events)
		*missing_events = next_lost;

	return next;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
182
77.12%
15
68.18%
Frédéric Weisbecker
40
16.95%
1
4.55%
Ingo Molnar
7
2.97%
2
9.09%
Török Edwin
3
1.27%
1
4.55%
Lai Jiangshan
2
0.85%
1
4.55%
Pekka Paalanen
1
0.42%
1
4.55%
Eric W. Biedermann
1
0.42%
1
4.55%
Total
236
100.00%
22
100.00%

/* Find the next real entry, without updating the iterator itself */


struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
					  int *ent_cpu, u64 *ent_ts)
{
	return __find_next_entry(iter, ent_cpu, NULL, ent_ts);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
31
96.88%
5
83.33%
Frédéric Weisbecker
1
3.12%
1
16.67%
Total
32
100.00%
6
100.00%

/* Find the next real entry, and increment the iterator to the next entry */


void *trace_find_next_entry_inc(struct trace_iterator *iter)
{
	iter->ent = __find_next_entry(iter, &iter->cpu,
				      &iter->lost_events, &iter->ts);

	if (iter->ent)
		trace_iterator_increment(iter);

	return iter->ent ? iter : NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
51
92.73%
11
73.33%
Jason Wessel
1
1.82%
1
6.67%
Peter Zijlstra
1
1.82%
1
6.67%
Ingo Molnar
1
1.82%
1
6.67%
Pekka Paalanen
1
1.82%
1
6.67%
Total
55
100.00%
15
100.00%



static void trace_consume(struct trace_iterator *iter)
{
	ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts,
			    &iter->lost_events);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
28
82.35%
7
77.78%
Ingo Molnar
4
11.76%
1
11.11%
Frédéric Weisbecker
2
5.88%
1
11.11%
Total
34
100.00%
9
100.00%



static void *s_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct trace_iterator *iter = m->private;
	int i = (int)*pos;
	void *ent;

	WARN_ON_ONCE(iter->leftover);

	(*pos)++;

	/* can't go backwards */
	if (iter->idx > i)
		return NULL;

	if (iter->idx < 0)
		ent = trace_find_next_entry_inc(iter);
	else
		ent = iter;

	while (ent && iter->idx < i)
		ent = trace_find_next_entry_inc(iter);

	iter->pos = *pos;

	return ent;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
84
73.68%
12
54.55%
Török Edwin
12
10.53%
2
9.09%
Ingo Molnar
11
9.65%
3
13.64%
Arnaldo Carvalho de Melo
3
2.63%
2
9.09%
Jason Wessel
2
1.75%
1
4.55%
Pekka Paalanen
1
0.88%
1
4.55%
Frédéric Weisbecker
1
0.88%
1
4.55%
Total
114
100.00%
22
100.00%



void tracing_iter_reset(struct trace_iterator *iter, int cpu)
{
	struct ring_buffer_event *event;
	struct ring_buffer_iter *buf_iter;
	unsigned long entries = 0;
	u64 ts;

	per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0;

	buf_iter = trace_buffer_iter(iter, cpu);
	if (!buf_iter)
		return;

	ring_buffer_iter_reset(buf_iter);

	/*
         * We could have the case with the max latency tracers
         * that a reset never took place on a cpu. This is evident
         * by the timestamp being before the start of the buffer.
         */
	while ((event = ring_buffer_iter_peek(buf_iter, &ts))) {
		if (ts >= iter->trace_buffer->time_start)
			break;
		entries++;
		ring_buffer_read(buf_iter, NULL);
	}

	per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
92
76.67%
7
70.00%
Ingo Molnar
26
21.67%
1
10.00%
Arnaldo Carvalho de Melo
2
1.67%
2
20.00%
Total
120
100.00%
10
100.00%

/*
 * The current tracer is copied to avoid a global locking
 * all around.
 */


static void *s_start(struct seq_file *m, loff_t *pos)
{
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;
	int cpu_file = iter->cpu_file;
	void *p = NULL;
	loff_t l = 0;
	int cpu;

	/*
         * copy the tracer to avoid using a global lock all around.
         * iter->trace is a copy of current_trace, the pointer to the
         * name may be used instead of a strcmp(), as iter->trace->name
         * will point to the same string as current_trace->name.
         */
	mutex_lock(&trace_types_lock);
	if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name))
		*iter->trace = *tr->current_trace;
	mutex_unlock(&trace_types_lock);

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->trace->use_max_tr)
		return ERR_PTR(-EBUSY);
#endif

	if (!iter->snapshot)
		atomic_inc(&trace_record_cmdline_disabled);

	if (*pos != iter->pos) {
		iter->ent = NULL;
		iter->cpu = 0;
		iter->idx = -1;

		if (cpu_file == RING_BUFFER_ALL_CPUS) {
			for_each_tracing_cpu(cpu)
				tracing_iter_reset(iter, cpu);
		} else
			tracing_iter_reset(iter, cpu_file);

		iter->leftover = 0;
		for (p = iter; p && l < *pos; p = s_next(m, p, &l))
			;

	} else {
		/*
                 * If we overflowed the seq_file before, then we want
                 * to just reuse the trace_seq buffer again.
                 */
		if (iter->leftover)
			p = iter;
		else {
			l = *pos - 1;
			p = s_next(m, p, &l);
		}
	}

	trace_event_read_lock();
	trace_access_lock(cpu_file);
	return p;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
159
58.46%
16
45.71%
Ingo Molnar
35
12.87%
5
14.29%
Hiraku Toyooka
24
8.82%
2
5.71%
Frédéric Weisbecker
24
8.82%
3
8.57%
Lai Jiangshan
11
4.04%
3
8.57%
Török Edwin
9
3.31%
2
5.71%
Peter Zijlstra
6
2.21%
2
5.71%
Arnaldo Carvalho de Melo
4
1.47%
2
5.71%
Total
272
100.00%
35
100.00%



static void s_stop(struct seq_file *m, void *p)
{
	struct trace_iterator *iter = m->private;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->trace->use_max_tr)
		return;
#endif

	if (!iter->snapshot)
		atomic_dec(&trace_record_cmdline_disabled);

	trace_access_unlock(iter->cpu_file);
	trace_event_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
43
66.15%
5
62.50%
Lai Jiangshan
12
18.46%
2
25.00%
Hiraku Toyooka
10
15.38%
1
12.50%
Total
65
100.00%
8
100.00%


static void

get_total_entries(struct trace_buffer *buf,
		  unsigned long *total, unsigned long *entries)
{
	unsigned long count;
	int cpu;

	*total = 0;
	*entries = 0;

	for_each_tracing_cpu(cpu) {
		count = ring_buffer_entries_cpu(buf->buffer, cpu);
		/*
                 * If this buffer has skipped entries, then we hold all
                 * entries for the trace and we need to ignore the
                 * ones before the time stamp.
                 */
		if (per_cpu_ptr(buf->data, cpu)->skipped_entries) {
			count -= per_cpu_ptr(buf->data, cpu)->skipped_entries;
			/* total is the same as the entries */
			*total += count;
		} else
			*total += count +
				ring_buffer_overrun_cpu(buf->buffer, cpu);
		*entries += count;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
109
99.09%
8
88.89%
Ingo Molnar
1
0.91%
1
11.11%
Total
110
100.00%
9
100.00%



static void print_lat_help_header(struct seq_file *m)
{
	seq_puts(m, "#                  _------=> CPU#            \n"
		    "#                 / _-----=> irqs-off        \n"
		    "#                | / _----=> need-resched    \n"
		    "#                || / _---=> hardirq/softirq \n"
		    "#                ||| / _--=> preempt-depth   \n"
		    "#                |||| /     delay            \n"
		    "#  cmd     pid   ||||| time  |   caller      \n"
		    "#     \\   /      |||||  \\    |   /         \n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
10
40.00%
3
42.86%
Ingo Molnar
8
32.00%
2
28.57%
Michael Ellerman
5
20.00%
1
14.29%
Rasmus Villemoes
2
8.00%
1
14.29%
Total
25
100.00%
7
100.00%



static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
{
	unsigned long total;
	unsigned long entries;

	get_total_entries(buf, &total, &entries);
	seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu   #P:%d\n",
		   entries, total, num_online_cpus());
	seq_puts(m, "#\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
35
62.50%
2
66.67%
Jiri Olsa
21
37.50%
1
33.33%
Total
56
100.00%
3
100.00%



static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
{
	print_event_info(buf, m);
	seq_puts(m, "#           TASK-PID   CPU#      TIMESTAMP  FUNCTION\n"
		    "#              | |       |          |         |\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Olsa
16
51.61%
1
16.67%
Steven Rostedt
14
45.16%
4
66.67%
Michael Ellerman
1
3.23%
1
16.67%
Total
31
100.00%
6
100.00%



static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
{
	print_event_info(buf, m);
	seq_puts(m, "#                              _-----=> irqs-off\n"
		    "#                             / _----=> need-resched\n"
		    "#                            | / _---=> hardirq/softirq\n"
		    "#                            || / _--=> preempt-depth\n"
		    "#                            ||| /     delay\n"
		    "#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION\n"
		    "#              | |       |   ||||       |         |\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
36
100.00%
5
100.00%
Total
36
100.00%
5
100.00%


void

print_trace_header(struct seq_file *m, struct trace_iterator *iter)
{
	unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK);
	struct trace_buffer *buf = iter->trace_buffer;
	struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu);
	struct tracer *type = iter->trace;
	unsigned long entries;
	unsigned long total;
	const char *name = "preemption";

	name = type->name;

	get_total_entries(buf, &total, &entries);

	seq_printf(m, "# %s latency trace v1.1.5 on %s\n",
		   name, UTS_RELEASE);
	seq_puts(m, "# -----------------------------------"
		 "---------------------------------\n");
	seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |"
		   " (M:%s VP:%d, KP:%d, SP:%d HP:%d",
		   nsecs_to_usecs(data->saved_latency),
		   entries,
		   total,
		   buf->cpu,
#if defined(CONFIG_PREEMPT_NONE)
		   "server",
#elif defined(CONFIG_PREEMPT_VOLUNTARY)
		   "desktop",
#elif defined(CONFIG_PREEMPT)
		   "preempt",
#else
		   "unknown",
#endif
		   /* These are reserved for later use */
		   0, 0, 0, 0);
#ifdef CONFIG_SMP
	seq_printf(m, " #P:%d)\n", num_online_cpus());
#else
	seq_puts(m, ")\n");
#endif
	seq_puts(m, "#    -----------------\n");
	seq_printf(m, "#    | task: %.16s-%d "
		   "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n",
		   data->comm, data->pid,
		   from_kuid_munged(seq_user_ns(m), data->uid), data->nice,
		   data->policy, data->rt_priority);
	seq_puts(m, "#    -----------------\n");

	if (data->critical_start) {
		seq_puts(m, "#  => started at: ");
		seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags);
		trace_print_seq(m, &iter->seq);
		seq_puts(m, "\n#  => ended at:   ");
		seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags);
		trace_print_seq(m, &iter->seq);
		seq_puts(m, "\n#\n");
	}

	seq_puts(m, "#\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
291
86.61%
20
66.67%
Ingo Molnar
12
3.57%
3
10.00%
Motohiro Kosaki
9
2.68%
1
3.33%
Eric W. Biedermann
8
2.38%
1
3.33%
Török Edwin
7
2.08%
1
3.33%
Markus Metzger
6
1.79%
1
3.33%
Peter Zijlstra
2
0.60%
2
6.67%
Ankita Garg
1
0.30%
1
3.33%
Total
336
100.00%
30
100.00%



static void test_cpu_buff_start(struct trace_iterator *iter)
{
	struct trace_seq *s = &iter->seq;
	struct trace_array *tr = iter->tr;

	if (!(tr->trace_flags & TRACE_ITER_ANNOTATE))
		return;

	if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
		return;

	if (iter->started && cpumask_test_cpu(iter->cpu, iter->started))
		return;

	if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)
		return;

	if (iter->started)
		cpumask_set_cpu(iter->cpu, iter->started);

	/* Don't print started cpu buffer for the first entry of the trace */
	if (iter->idx > 1)
		trace_seq_printf(s, "##### CPU %u buffer started ####\n",
				iter->cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
85
66.93%
15
65.22%
Frédéric Weisbecker
20
15.75%
2
8.70%
Sasha Levin
10
7.87%
1
4.35%
Ingo Molnar
9
7.09%
3
13.04%
Dan Carpenter
2
1.57%
1
4.35%
Jiri Olsa
1
0.79%
1
4.35%
Total
127
100.00%
23
100.00%



static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	test_cpu_buff_start(iter);

	event = ftrace_find_event(entry->type);

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
		if (iter->iter_flags & TRACE_FILE_LAT_FMT)
			trace_print_lat_context(iter);
		else
			trace_print_context(iter);
	}

	if (trace_seq_has_overflowed(s))
		return TRACE_TYPE_PARTIAL_LINE;

	if (event)
		return event->funcs->trace(iter, sym_flags, event);

	trace_seq_printf(s, "Unknown type %d\n", entry->type);

	return trace_handle_return(s);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
101
68.71%
14
56.00%
Frédéric Weisbecker
23
15.65%
4
16.00%
Ingo Molnar
7
4.76%
3
12.00%
Markus Metzger
5
3.40%
1
4.00%
Arnaldo Carvalho de Melo
4
2.72%
1
4.00%
Hiraku Toyooka
4
2.72%
1
4.00%
David S. Miller
3
2.04%
1
4.00%
Total
147
100.00%
25
100.00%



static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO)
		trace_seq_printf(s, "%d %d %llu ",
				 entry->pid, iter->cpu, iter->ts);

	if (trace_seq_has_overflowed(s))
		return TRACE_TYPE_PARTIAL_LINE;

	event = ftrace_find_event(entry->type);
	if (event)
		return event->funcs->raw(iter, 0, event);

	trace_seq_printf(s, "%d ?\n", entry->type);

	return trace_handle_return(s);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
66
51.56%
8
57.14%
Ingo Molnar
37
28.91%
1
7.14%
Frédéric Weisbecker
19
14.84%
3
21.43%
David S. Miller
4
3.12%
1
7.14%
Arnaldo Carvalho de Melo
2
1.56%
1
7.14%
Total
128
100.00%
14
100.00%



static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	unsigned char newline = '\n';
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
		SEQ_PUT_HEX_FIELD(s, entry->pid);
		SEQ_PUT_HEX_FIELD(s, iter->cpu);
		SEQ_PUT_HEX_FIELD(s, iter->ts);
		if (trace_seq_has_overflowed(s))
			return TRACE_TYPE_PARTIAL_LINE;
	}

	event = ftrace_find_event(entry->type);
	if (event) {
		enum print_line_t ret = event->funcs->hex(iter, 0, event);
		if (ret != TRACE_TYPE_HANDLED)
			return ret;
	}

	SEQ_PUT_FIELD(s, newline);

	return trace_handle_return(s);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
105
68.18%
9
45.00%
Ingo Molnar
18
11.69%
2
10.00%
Frédéric Weisbecker
12
7.79%
2
10.00%
Arnaldo Carvalho de Melo
11
7.14%
3
15.00%
Julia Lawall
3
1.95%
1
5.00%
Jiri Olsa
3
1.95%
1
5.00%
Peter Zijlstra
2
1.30%
2
10.00%
Total
154
100.00%
20
100.00%



static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
		SEQ_PUT_FIELD(s, entry->pid);
		SEQ_PUT_FIELD(s, iter->cpu);
		SEQ_PUT_FIELD(s, iter->ts);
		if (trace_seq_has_overflowed(s))
			return TRACE_TYPE_PARTIAL_LINE;
	}

	event = ftrace_find_event(entry->type);
	return event ? event->funcs->binary(iter, 0, event) :
		TRACE_TYPE_HANDLED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
77
63.64%
10
47.62%
Ingo Molnar
25
20.66%
2
9.52%
Frédéric Weisbecker
11
9.09%
4
19.05%
Arnaldo Carvalho de Melo
4
3.31%
2
9.52%
Peter Zijlstra
2
1.65%
1
4.76%
Hannes Eder
1
0.83%
1
4.76%
Jiri Olsa
1
0.83%
1
4.76%
Total
121
100.00%
21
100.00%



int trace_empty(struct trace_iterator *iter)
{
	struct ring_buffer_iter *buf_iter;
	int cpu;

	/* If we are looking at one CPU buffer, only check that one */
	if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
		cpu = iter->cpu_file;
		buf_iter = trace_buffer_iter(iter, cpu);
		if (buf_iter) {
			if (!ring_buffer_iter_empty(buf_iter))
				return 0;
		} else {
			if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu))
				return 0;
		}
		return 1;
	}

	for_each_tracing_cpu(cpu) {
		buf_iter = trace_buffer_iter(iter, cpu);
		if (buf_iter) {
			if (!ring_buffer_iter_empty(buf_iter))
				return 0;
		} else {
			if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu))
				return 0;
		}
	}

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
137
98.56%
10
83.33%
Frédéric Weisbecker
1
0.72%
1
8.33%
Ingo Molnar
1
0.72%
1
8.33%
Total
139
100.00%
12
100.00%

/*  Called with trace_event_read_lock() held. */


enum print_line_t print_trace_line(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	unsigned long trace_flags = tr->trace_flags;
	enum print_line_t ret;

	if (iter->lost_events) {
		trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n",
				 iter->cpu, iter->lost_events);
		if (trace_seq_has_overflowed(&iter->seq))
			return TRACE_TYPE_PARTIAL_LINE;
	}

	if (iter->trace && iter->trace->print_line) {
		ret = iter->trace->print_line(iter);
		if (ret != TRACE_TYPE_UNHANDLED)
			return ret;
	}

	if (iter->ent->type == TRACE_BPUTS &&
			trace_flags & TRACE_ITER_PRINTK &&
			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
		return trace_print_bputs_msg_only(iter);

	if (iter->ent->type == TRACE_BPRINT &&
			trace_flags & TRACE_ITER_PRINTK &&
			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
		return trace_print_bprintk_msg_only(iter);

	if (iter->ent->type == TRACE_PRINT &&
			trace_flags & TRACE_ITER_PRINTK &&
			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
		return trace_print_printk_msg_only(iter);

	if (trace_flags & TRACE_ITER_BIN)
		return print_bin_fmt(iter);

	if (trace_flags & TRACE_ITER_HEX)
		return print_hex_fmt(iter);

	if (trace_flags & TRACE_ITER_RAW)
		return print_raw_fmt(iter);

	return print_trace_fmt(iter);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
102
46.58%
6
42.86%
Frédéric Weisbecker
56
25.57%
3
21.43%
Ingo Molnar
39
17.81%
3
21.43%
Thomas Gleixner
19
8.68%
1
7.14%
Jiri Olsa
3
1.37%
1
7.14%
Total
219
100.00%
14
100.00%



void trace_latency_header(struct seq_file *m)
{
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;

	/* print nothing if the buffers are empty */
	if (trace_empty(iter))
		return;

	if (iter->iter_flags & TRACE_FILE_LAT_FMT)
		print_trace_header(m, iter);

	if (!(tr->trace_flags & TRACE_ITER_VERBOSE))
		print_lat_help_header(m);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Olsa
48
70.59%
1
33.33%
Steven Rostedt
20
29.41%
2
66.67%
Total
68
100.00%
3
100.00%



void trace_default_header(struct seq_file *m)
{
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;
	unsigned long trace_flags = tr->trace_flags;

	if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
		return;

	if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
		/* print nothing if the buffers are empty */
		if (trace_empty(iter))
			return;
		print_trace_header(m, iter);
		if (!(trace_flags & TRACE_ITER_VERBOSE))
			print_lat_help_header(m);
	} else {
		if (!(trace_flags & TRACE_ITER_VERBOSE)) {
			if (trace_flags & TRACE_ITER_IRQ_INFO)
				print_func_help_header_irq(iter->trace_buffer, m);
			else
				print_func_help_header(iter->trace_buffer, m);
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
69
55.20%
5
71.43%
Jiri Olsa
56
44.80%
2
28.57%
Total
125
100.00%
7
100.00%



static void test_ftrace_alive(struct seq_file *m)
{
	if (!ftrace_is_dead())
		return;
	seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n"
		    "#          MAY BE MISSING FUNCTION EVENTS\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
25
96.15%
3
75.00%
Rasmus Villemoes
1
3.85%
1
25.00%
Total
26
100.00%
4
100.00%

#ifdef CONFIG_TRACER_MAX_TRACE


static void show_snapshot_main_help(struct seq_file *m)
{
	seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n"
		    "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"
		    "#                      Takes a snapshot of the main buffer.\n"
		    "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n"
		    "#                      (Doesn't have to be '2' works with any number that\n"
		    "#                       is not a '0' or '1')\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
16
69.57%
3
42.86%
Ingo Molnar
3
13.04%
1
14.29%
Slava Pestov
2
8.70%
1
14.29%
Rasmus Villemoes
1
4.35%
1
14.29%
Wang YanQing
1
4.35%
1
14.29%
Total
23
100.00%
7
100.00%



static void show_snapshot_percpu_help(struct seq_file *m)
{
	seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n");
#ifdef CONFIG_RING_BUFFER_ALLOW_SWAP
	seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"
		    "#                      Takes a snapshot of the main buffer for this cpu.\n");
#else
	seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n"
		    "#                     Must use main snapshot file to allocate.\n");
#endif
	seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n"
		    "#                      (Doesn't have to be '2' works with any number that\n"
		    "#                       is not a '0' or '1')\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
26
52.00%
2
25.00%
Ingo Molnar
13
26.00%
2
25.00%
Rasmus Villemoes
4
8.00%
1
12.50%
Rusty Russell
3
6.00%
1
12.50%
Li Zefan
2
4.00%
1
12.50%
Vaibhav Nagarnaik
2
4.00%
1
12.50%
Total
50
100.00%
8
100.00%



static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter)
{
	if (iter->tr->allocated_snapshot)
		seq_puts(m, "#\n# * Snapshot is allocated *\n#\n");
	else
		seq_puts(m, "#\n# * Snapshot is freed *\n#\n");

	seq_puts(m, "# Snapshot commands:\n");
	if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
		show_snapshot_main_help(m);
	else
		show_snapshot_percpu_help(m);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
41
63.08%
2
28.57%
Ingo Molnar
10
15.38%
2
28.57%
Rusty Russell
9
13.85%
1
14.29%
Rasmus Villemoes
3
4.62%
1
14.29%
Vaibhav Nagarnaik
2
3.08%
1
14.29%
Total
65
100.00%
7
100.00%

#else
/* Should never be called */


static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
14
87.50%
1
50.00%
Ingo Molnar
2
12.50%
1
50.00%
Total
16
100.00%
2
100.00%

#endif



static int s_show(struct seq_file *m, void *v)
{
	struct trace_iterator *iter = v;
	int ret;

	if (iter->ent == NULL) {
		if (iter->tr) {
			seq_printf(m, "# tracer: %s\n", iter->trace->name);
			seq_puts(m, "#\n");
			test_ftrace_alive(m);
		}
		if (iter->snapshot && trace_empty(iter))
			print_snapshot_help(m, iter);
		else if (iter->trace && iter->trace->print_header)
			iter->trace->print_header(m);
		else
			trace_default_header(m);

	} else if (iter->leftover) {
		/*
                 * If we filled the seq_file buffer earlier, we
                 * want to just show it now.
                 */
		ret = trace_print_seq(m, &iter->seq);

		/* ret should this time be zero, but you never know */
		iter->leftover = ret;

	} else {
		print_trace_line(iter);
		ret = trace_print_seq(m, &iter->seq);
		/*
                 * If we overflow the seq_file buffer, then it will
                 * ask us for this data again at start up.
                 * Use that instead.
                 *  ret is 0 if seq_file write succeeded.
                 *        -1 otherwise.
                 */
		iter->leftover = ret;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
130
75.14%
6
50.00%
Markus Metzger
15
8.67%
1
8.33%
Frédéric Weisbecker
14
8.09%
1
8.33%
Li Zefan
11
6.36%
1
8.33%
Ingo Molnar
2
1.16%
2
16.67%
Jiri Olsa
1
0.58%
1
8.33%
Total
173
100.00%
12
100.00%

/*
 * Should be used after trace_array_get(), trace_types_lock
 * ensures that i_cdev was already initialized.
 */


static inline int tracing_get_cpu(struct inode *inode)
{
	if (inode->i_cdev) /* See trace_create_cpu_file() */
		return (long)inode->i_cdev - 1;
	return RING_BUFFER_ALL_CPUS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
32
100.00%
1
100.00%
Total
32
100.00%
1
100.00%


static const struct seq_operations tracer_seq_ops = {
	.start		= s_start,
	.next		= s_next,
	.stop		= s_stop,
	.show		= s_show,
};


static struct trace_iterator *

__tracing_open(struct inode *inode, struct file *file, bool snapshot)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	int cpu;

	if (tracing_disabled)
		return ERR_PTR(-ENODEV);

	iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter));
	if (!iter)
		return ERR_PTR(-ENOMEM);

	iter->buffer_iter = kcalloc(nr_cpu_ids, sizeof(*iter->buffer_iter),
				    GFP_KERNEL);
	if (!iter->buffer_iter)
		goto release;

	/*
         * We make a copy of the current tracer to avoid concurrent
         * changes on it while we are reading.
         */
	mutex_lock(&trace_types_lock);
	iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL);
	if (!iter->trace)
		goto fail;

	*iter->trace = *tr->current_trace;

	if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL))
		goto fail;

	iter->tr = tr;

#ifdef CONFIG_TRACER_MAX_TRACE
	/* Currently only the top directory has a snapshot */
	if (tr->current_trace->print_max || snapshot)
		iter->trace_buffer = &tr->max_buffer;
	else
#endif
		iter->trace_buffer = &tr->trace_buffer;
	iter->snapshot = snapshot;
	iter->pos = -1;
	iter->cpu_file = tracing_get_cpu(inode);
	mutex_init(&iter->mutex);

	/* Notify the tracer early; before we stop tracing. */
	if (iter->trace && iter->trace->open)
		iter->trace->open(iter);

	/* Annotate start of buffers if we had overruns */
	if (ring_buffer_overruns(iter->trace_buffer->buffer))
		iter->iter_flags |= TRACE_FILE_ANNOTATE;

	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
	if (trace_clocks[tr->clock_id].in_ns)
		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;

	/* stop the trace while dumping if we are not opening "snapshot" */
	if (!iter->snapshot)
		tracing_stop_tr(tr);

	if (iter->cpu_file == RING_BUFFER_ALL_CPUS) {
		for_each_tracing_cpu(cpu) {
			iter->buffer_iter[cpu] =
				ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
		}
		ring_buffer_read_prepare_sync();
		for_each_tracing_cpu(cpu) {
			ring_buffer_read_start(iter->buffer_iter[cpu]);
			tracing_iter_reset(iter, cpu);
		}
	} else {
		cpu = iter->cpu_file;
		iter->buffer_iter[cpu] =
			ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
		ring_buffer_read_prepare_sync();
		ring_buffer_read_start(iter->buffer_iter[cpu]);
		tracing_iter_reset(iter, cpu);
	}

	mutex_unlock(&trace_types_lock);

	return iter;

 fail:
	mutex_unlock(&trace_types_lock);
	kfree(iter->trace);
	kfree(iter->buffer_iter);
release:
	seq_release_private(inode, file);
	return ERR_PTR(-ENOMEM);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
223
48.27%
17
45.95%
Frédéric Weisbecker
102
22.08%
4
10.81%
David S. Miller
26
5.63%
1
2.70%
Oleg Nesterov
18
3.90%
1
2.70%
Hiraku Toyooka
18
3.90%
1
2.70%
David Sharp
17
3.68%
2
5.41%
Markus Metzger
16
3.46%
1
2.70%
Jiri Olsa
13
2.81%
1
2.70%
Li Zefan
8
1.73%
3
8.11%
Dan Carpenter
8
1.73%
1
2.70%
Julia Lawall
5
1.08%
1
2.70%
Gil Fruchter
3
0.65%
2
5.41%
Yoshihiro Yunomae
3
0.65%
1
2.70%
Ingo Molnar
2
0.43%
1
2.70%
Total
462
100.00%
37
100.00%



int tracing_open_generic(struct inode *inode, struct file *filp)
{
	if (tracing_disabled)
		return -ENODEV;

	filp->private_data = inode->i_private;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
29
85.29%
3
60.00%
Frédéric Weisbecker
3
8.82%
1
20.00%
Ingo Molnar
2
5.88%
1
20.00%
Total
34
100.00%
5
100.00%



bool tracing_is_disabled(void)
{
	return (tracing_disabled) ? true: false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Geyslan G. Bem
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

/*
 * Open and update trace_array ref count.
 * Must have the current trace_array passed to it.
 */


static int tracing_open_generic_tr(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	filp->private_data = inode->i_private;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
57
100.00%
2
100.00%
Total
57
100.00%
2
100.00%



static int tracing_release(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct seq_file *m = file->private_data;
	struct trace_iterator *iter;
	int cpu;

	if (!(file->f_mode & FMODE_READ)) {
		trace_array_put(tr);
		return 0;
	}

	/* Writes do not use seq_file */
	iter = m->private;
	mutex_lock(&trace_types_lock);

	for_each_tracing_cpu(cpu) {
		if (iter->buffer_iter[cpu])
			ring_buffer_read_finish(iter->buffer_iter[cpu]);
	}

	if (iter->trace && iter->trace->close)
		iter->trace->close(iter);

	if (!iter->snapshot)
		/* reenable tracing if it was previously enabled */
		tracing_start_tr(tr);

	__trace_array_put(tr);

	mutex_unlock(&trace_types_lock);

	mutex_destroy(&iter->mutex);
	free_cpumask_var(iter->started);
	kfree(iter->trace);
	kfree(iter->buffer_iter);
	seq_release_private(inode, file);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
136
73.51%
12
63.16%
Frédéric Weisbecker
22
11.89%
2
10.53%
Oleg Nesterov
10
5.41%
1
5.26%
Hiraku Toyooka
7
3.78%
1
5.26%
Alexander Z Lam
5
2.70%
1
5.26%
Jiri Olsa
4
2.16%
1
5.26%
Hannes Eder
1
0.54%
1
5.26%
Total
185
100.00%
19
100.00%



static int tracing_release_generic_tr(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;

	trace_array_put(tr);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%



static int tracing_single_release_tr(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;

	trace_array_put(tr);

	return single_release(inode, file);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%



static int tracing_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	int ret = 0;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	/* If this file was open for write, then erase contents */
	if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
		int cpu = tracing_get_cpu(inode);

		if (cpu == RING_BUFFER_ALL_CPUS)
			tracing_reset_online_cpus(&tr->trace_buffer);
		else
			tracing_reset(&tr->trace_buffer, cpu);
	}

	if (file->f_mode & FMODE_READ) {
		iter = __tracing_open(inode, file, false);
		if (IS_ERR(iter))
			ret = PTR_ERR(iter);
		else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
			iter->iter_flags |= TRACE_FILE_LAT_FMT;
	}

	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
128
77.11%
10
71.43%
Li Zefan
17
10.24%
1
7.14%
Ingo Molnar
10
6.02%
1
7.14%
Oleg Nesterov
10
6.02%
1
7.14%
Hiraku Toyooka
1
0.60%
1
7.14%
Total
166
100.00%
14
100.00%

/*
 * Some tracers are not suitable for instance buffers.
 * A tracer is always available for the global array (toplevel)
 * or if it explicitly states that it is.
 */

static bool

trace_ok_for_array(struct tracer *t, struct trace_array *tr)
{
	return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%

/* Find the next tracer that this trace array may use */

static struct tracer *

get_tracer_for_array(struct trace_array *tr, struct tracer *t)
{
	while (t && !trace_ok_for_array(t, tr))
		t = t->next;

	return t;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%


static void *

t_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct trace_array *tr = m->private;
	struct tracer *t = v;

	(*pos)++;

	if (t)
		t = get_tracer_for_array(tr, t->next);

	return t;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
47
78.33%
2
40.00%
Avadh Patel
11
18.33%
1
20.00%
Li Zefan
1
1.67%
1
20.00%
Ingo Molnar
1
1.67%
1
20.00%
Total
60
100.00%
5
100.00%



static void *t_start(struct seq_file *m, loff_t *pos)
{
	struct trace_array *tr = m->private;
	struct tracer *t;
	loff_t l = 0;

	mutex_lock(&trace_types_lock);

	t = get_tracer_for_array(tr, trace_types);
	for (; t && l < *pos; t = t_next(m, t, &l))
			;

	return t;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
65
85.53%
2
50.00%
Avadh Patel
9
11.84%
1
25.00%
Li Zefan
2
2.63%
1
25.00%
Total
76
100.00%
4
100.00%



static void t_stop(struct seq_file *m, void *p)
{
	mutex_unlock(&trace_types_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
17
80.95%
1
50.00%
Avadh Patel
4
19.05%
1
50.00%
Total
21
100.00%
2
100.00%



static int t_show(struct seq_file *m, void *v)
{
	struct tracer *t = v;

	if (!t)
		return 0;

	seq_puts(m, t->name);
	if (t->next)
		seq_putc(m, ' ');
	else
		seq_putc(m, '\n');

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
49
77.78%
1
33.33%
Avadh Patel
13
20.63%
1
33.33%
Rasmus Villemoes
1
1.59%
1
33.33%
Total
63
100.00%
3
100.00%


static const struct seq_operations show_traces_seq_ops = {
	.start		= t_start,
	.next		= t_next,
	.stop		= t_stop,
	.show		= t_show,
};



static int show_traces_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct seq_file *m;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	ret = seq_open(file, &show_traces_seq_ops);
	if (ret)
		return ret;

	m = file->private_data;
	m->private = tr;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
72
98.63%
3
75.00%
Avadh Patel
1
1.37%
1
25.00%
Total
73
100.00%
4
100.00%


static ssize_t

tracing_write_stub(struct file *filp, const char __user *ubuf,
		   size_t count, loff_t *ppos)
{
	return count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
17
62.96%
1
50.00%
Arnaldo Carvalho de Melo
10
37.04%
1
50.00%
Total
27
100.00%
2
100.00%



loff_t tracing_lseek(struct file *file, loff_t offset, int whence)
{
	int ret;

	if (file->f_mode & FMODE_READ)
		ret = seq_lseek(file, offset, whence);
	else
		file->f_pos = ret = 0;

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
18
36.00%
1
33.33%
Hiraku Toyooka
17
34.00%
1
33.33%
Slava Pestov
15
30.00%
1
33.33%
Total
50
100.00%
3
100.00%


static const struct file_operations tracing_fops = {
	.open		= tracing_open,
	.read		= seq_read,
	.write		= tracing_write_stub,
	.llseek		= tracing_lseek,
	.release	= tracing_release,
};


static const struct file_operations show_traces_fops = {
	.open		= show_traces_open,
	.read		= seq_read,
	.release	= seq_release,
	.llseek		= seq_lseek,
};

/*
 * The tracer itself will not take this lock, but still we want
 * to provide a consistent cpumask to user-space:
 */
static DEFINE_MUTEX(tracing_cpumask_update_lock);

/*
 * Temporary storage for the character representation of the
 * CPU bitmask (and one more byte for the newline):
 */

static char mask_str[NR_CPUS + 1];


static ssize_t

tracing_cpumask_read(struct file *filp, char __user *ubuf,
		     size_t count, loff_t *ppos)
{
	struct trace_array *tr = file_inode(filp)->i_private;
	int len;

	mutex_lock(&tracing_cpumask_update_lock);

	len = snprintf(mask_str, count, "%*pb\n",
		       cpumask_pr_args(tr->tracing_cpumask));
	if (len >= count) {
		count = -EINVAL;
		goto out_err;
	}
	count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1);

out_err:
	mutex_unlock(&tracing_cpumask_update_lock);

	return count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ingo Molnar
51
48.11%
2
25.00%
Steven Rostedt
19
17.92%
2
25.00%
Alexander Z Lam
14
13.21%
1
12.50%
Vaibhav Nagarnaik
9
8.49%
1
12.50%
Tejun Heo
8
7.55%
1
12.50%
Motohiro Kosaki
5
4.72%
1
12.50%
Total
106
100.00%
8
100.00%


static ssize_t

tracing_cpumask_write(struct file *filp, const char __user *ubuf,
		      size_t count, loff_t *ppos)
{
	struct trace_array *tr = file_inode(filp)->i_private;
	cpumask_var_t tracing_cpumask_new;
	int err, cpu;

	if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
		return -ENOMEM;

	err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
	if (err)
		goto err_unlock;

	mutex_lock(&tracing_cpumask_update_lock);

	local_irq_disable();
	arch_spin_lock(&tr->max_lock);
	for_each_tracing_cpu(cpu) {
		/*
                 * Increase/decrease the disabled counter if we are
                 * about to flip a bit in the cpumask:
                 */
		if (cpumask_test_cpu(cpu, tr->tracing_cpumask) &&
				!cpumask_test_cpu(cpu, tracing_cpumask_new)) {
			atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled);
			ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu);
		}
		if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) &&
				cpumask_test_cpu(cpu, tracing_cpumask_new)) {
			atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled);
			ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu);
		}
	}
	arch_spin_unlock(&tr->max_lock);
	local_irq_enable();

	cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new);

	mutex_unlock(&tracing_cpumask_update_lock);
	free_cpumask_var(tracing_cpumask_new);

	return count;

err_unlock:
	free_cpumask_var(tracing_cpumask_new);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ingo Molnar
103
42.39%
2
11.11%
Steven Rostedt
61
25.10%
9
50.00%
Vaibhav Nagarnaik
40
16.46%
3
16.67%
Rusty Russell
24
9.88%
1
5.56%
Alexander Z Lam
10
4.12%
1
5.56%
Li Zefan
3
1.23%
1
5.56%
Thomas Gleixner
2
0.82%
1
5.56%
Total
243
100.00%
18
100.00%


static const struct file_operations tracing_cpumask_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_cpumask_read,
	.write		= tracing_cpumask_write,
	.release	= tracing_release_generic_tr,
	.llseek		= generic_file_llseek,
};



static int tracing_trace_options_show(struct seq_file *m, void *v)
{
	struct tracer_opt *trace_opts;
	struct trace_array *tr = m->private;
	u32 tracer_flags;
	int i;

	mutex_lock(&trace_types_lock);
	tracer_flags = tr->current_trace->flags->val;
	trace_opts = tr->current_trace->flags->opts;

	for (i = 0; trace_options[i]; i++) {
		if (tr->trace_flags & (1 << i))
			seq_printf(m, "%s\n", trace_options[i]);
		else
			seq_printf(m, "no%s\n", trace_options[i]);
	}

	for (i = 0; trace_opts[i].name; i++) {
		if (tracer_flags & trace_opts[i].bit)
			seq_printf(m, "%s\n", trace_opts[i].name);
		else
			seq_printf(m, "no%s\n", trace_opts[i].name);
	}
	mutex_unlock(&trace_types_lock);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
108
59.67%
9
52.94%
Frédéric Weisbecker
39
21.55%
2
11.76%
Li Zefan
14
7.73%
1
5.88%
Motohiro Kosaki
8
4.42%
1
5.88%
Peter Zijlstra
5
2.76%
1
5.88%
Vaibhav Nagarnaik
4
2.21%
1
5.88%
Hiraku Toyooka
2
1.10%
1
5.88%
Arnaldo Carvalho de Melo
1
0.55%
1
5.88%
Total
181
100.00%
17
100.00%



static int __set_tracer_option(struct trace_array *tr,
			       struct tracer_flags *tracer_flags,
			       struct tracer_opt *opts, int neg)
{
	struct tracer *trace = tracer_flags->trace;
	int ret;

	ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
	if (ret)
		return ret;

	if (neg)
		tracer_flags->val &= ~opts->bit;
	else
		tracer_flags->val |= opts->bit;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Li Zefan
38
43.18%
1
10.00%
Steven Rostedt
18
20.45%
3
30.00%
Peter Zijlstra
16
18.18%
1
10.00%
Frédéric Weisbecker
13
14.77%
3
30.00%
Chunyu Hu
2
2.27%
1
10.00%
Zhao Lei
1
1.14%
1
10.00%
Total
88
100.00%
10
100.00%

/* Try to assign a tracer specific option */


static int set_tracer_option(struct trace_array *tr, char *cmp, int neg)
{
	struct tracer *trace = tr->current_trace;
	struct tracer_flags *tracer_flags = trace->flags;
	struct tracer_opt *opts = NULL;
	int i;

	for (i = 0; tracer_flags->opts[i].name; i++) {
		opts = &tracer_flags->opts[i];

		if (strcmp(cmp, opts->name) == 0)
			return __set_tracer_option(tr, trace->flags, opts, neg);
	}

	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Frédéric Weisbecker
55
51.40%
1
16.67%
Steven Rostedt
45
42.06%
3
50.00%
Li Zefan
4
3.74%
1
16.67%
Zhao Lei
3
2.80%
1
16.67%
Total
107
100.00%
6
100.00%

/* Some tracers require overwrite to stay enabled */


int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set)
{
	if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set)
		return -1;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
38
100.00%
3
100.00%
Total
38
100.00%
3
100.00%



int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
{
	/* do nothing if flag is already set */
	if (!!(tr->trace_flags & mask) == !!enabled)
		return 0;

	/* Give the tracer a chance to approve the change */
	if (tr->current_trace->flag_changed)
		if (tr->current_trace->flag_changed(tr, mask, !!enabled))
			return -EINVAL;

	if (enabled)
		tr->trace_flags |= mask;
	else
		tr->trace_flags &= ~mask;

	if (mask == TRACE_ITER_RECORD_CMD)
		trace_event_enable_cmd_record(enabled);

	if (mask == TRACE_ITER_EVENT_FORK)
		trace_event_follow_fork(tr, enabled);

	if (mask == TRACE_ITER_OVERWRITE) {
		ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled);
#ifdef CONFIG_TRACER_MAX_TRACE
		ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled);
#endif
	}

	if (mask == TRACE_ITER_PRINTK) {
		trace_printk_start_stop_comm(enabled);
		trace_printk_control(enabled);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
134
81.21%
11
68.75%
Frédéric Weisbecker
12
7.27%
2
12.50%
Li Zefan
8
4.85%
1
6.25%
David Sharp
7
4.24%
1
6.25%
Rusty Russell
4
2.42%
1
6.25%
Total
165
100.00%
16
100.00%



static int trace_set_options(struct trace_array *tr, char *option)
{
	char *cmp;
	int neg = 0;
	int ret = -ENODEV;
	int i;
	size_t orig_len = strlen(option);

	cmp = strstrip(option);

	if (strncmp(cmp, "no", 2) == 0) {
		neg = 1;
		cmp += 2;
	}

	mutex_lock(&trace_types_lock);

	for (i = 0; trace_options[i]; i++) {
		if (strcmp(cmp, trace_options[i]) == 0) {
			ret = set_tracer_flag(tr, 1 << i, !neg);
			break;
		}
	}

	/* If no option could be set, test the specific tracer options */
	if (!trace_options[i])
		ret = set_tracer_option(tr, cmp, neg);

	mutex_unlock(&trace_types_lock);

	/*
         * If the first trailing whitespace is replaced with '\0' by strstrip,
         * turn it back into a space.
         */
	if (orig_len > strlen(option))
		option[strlen(option)] = ' ';

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
97
56.07%
10
50.00%
Frédéric Weisbecker
28
16.18%
3
15.00%
Jiaxing Wang
28
16.18%
1
5.00%
Ingo Molnar
8
4.62%
1
5.00%
Li Zefan
5
2.89%
1
5.00%
Arnd Bergmann
3
1.73%
1
5.00%
Rusty Russell
2
1.16%
1
5.00%
David Sharp
1
0.58%
1
5.00%
Thomas Gleixner
1
0.58%
1
5.00%
Total
173
100.00%
20
100.00%



static void __init apply_trace_boot_options(void)
{
	char *buf = trace_boot_options_buf;
	char *option;

	while (true) {
		option = strsep(&buf, ",");

		if (!option)
			break;

		if (*option)
			trace_set_options(&global_trace, option);

		/* Put back the comma to allow this to be called again */
		if (buf)
			*(buf - 1) = ',';
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiaxing Wang
68
100.00%
1
100.00%
Total
68
100.00%
1
100.00%


static ssize_t

tracing_trace_options_write(struct file *filp, const char __user *ubuf,
			size_t cnt, loff_t *ppos)
{
	struct seq_file *m = filp->private_data;
	struct trace_array *tr = m->private;
	char buf[64];
	int ret;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	ret = trace_set_options(tr, buf);
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
81
72.32%
6
75.00%
Soeren Sandmann Pedersen
29
25.89%
1
12.50%
Jiri Olsa
2
1.79%
1
12.50%
Total
112
100.00%
8
100.00%



static int tracing_trace_options_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	ret = single_open(file, tracing_trace_options_show, inode->i_private);
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
25
32.89%
2
40.00%
Li Zefan
24
31.58%
1
20.00%
Alexander Z Lam
19
25.00%
1
20.00%
Frédéric Weisbecker
8
10.53%
1
20.00%
Total
76
100.00%
5
100.00%


static const struct file_operations tracing_iter_fops = {
	.open		= tracing_trace_options_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= tracing_single_release_tr,
	.write		= tracing_trace_options_write,
};


static const char readme_msg[] =
	"tracing mini-HOWTO:\n\n"
	"# echo 0 > tracing_on : quick way to disable tracing\n"
	"# echo 1 > tracing_on : quick way to re-enable tracing\n\n"
	" Important files:\n"
	"  trace\t\t\t- The static contents of the buffer\n"
	"\t\t\t  To clear the buffer write into this file: echo > trace\n"
	"  trace_pipe\t\t- A consuming read to see the contents of the buffer\n"
	"  current_tracer\t- function and latency tracers\n"
	"  available_tracers\t- list of configured tracers for current_tracer\n"
	"  buffer_size_kb\t- view and modify size of per cpu buffer\n"
	"  buffer_total_size_kb  - view total size of all cpu buffers\n\n"
	"  trace_clock\t\t-change the clock used to order events\n"
	"       local:   Per cpu clock but may not be synced across CPUs\n"
	"      global:   Synced across CPUs but slows tracing down.\n"
	"     counter:   Not a clock, but just an increment\n"
	"      uptime:   Jiffy counter from time of boot\n"
	"        perf:   Same clock that perf events use\n"
#ifdef CONFIG_X86_64
	"     x86-tsc:   TSC cycle counter\n"
#endif
	"\n  trace_marker\t\t- Writes into this file writes into the kernel buffer\n"
	"\n  trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n"
	"  tracing_cpumask\t- Limit which CPUs to trace\n"
	"  instances\t\t- Make sub-buffers with: mkdir instances/foo\n"
	"\t\t\t  Remove sub-buffer with rmdir\n"
	"  trace_options\t\t- Set format or modify how tracing happens\n"
	"\t\t\t  Disable an option by adding a suffix 'no' to the\n"
	"\t\t\t  option name\n"
	"  saved_cmdlines_size\t- echo command number in here to store comm-pid list\n"
#ifdef CONFIG_DYNAMIC_FTRACE
	"\n  available_filter_functions - list of functions that can be filtered on\n"
	"  set_ftrace_filter\t- echo function name in here to only trace these\n"
	"\t\t\t  functions\n"
	"\t     accepts: func_full_name or glob-matching-pattern\n"
	"\t     modules: Can select a group via module\n"
	"\t      Format: :mod:<module-name>\n"
	"\t     example: echo :mod:ext3 > set_ftrace_filter\n"
	"\t    triggers: a command to perform when function is hit\n"
	"\t      Format: <function>:<trigger>[:count]\n"
	"\t     trigger: traceon, traceoff\n"
	"\t\t      enable_event:<system>:<event>\n"
	"\t\t      disable_event:<system>:<event>\n"
#ifdef CONFIG_STACKTRACE
	"\t\t      stacktrace\n"
#endif
#ifdef CONFIG_TRACER_SNAPSHOT
	"\t\t      snapshot\n"
#endif
	"\t\t      dump\n"
	"\t\t      cpudump\n"
	"\t     example: echo do_fault:traceoff > set_ftrace_filter\n"
	"\t              echo do_trap:traceoff:3 > set_ftrace_filter\n"
	"\t     The first one will disable tracing every time do_fault is hit\n"
	"\t     The second will disable tracing at most 3 times when do_trap is hit\n"
	"\t       The first time do trap is hit and it disables tracing, the\n"
	"\t       counter will decrement to 2. If tracing is already disabled,\n"
	"\t       the counter will not decrement. It only decrements when the\n"
	"\t       trigger did work\n"
	"\t     To remove trigger without count:\n"
	"\t       echo '!<function>:<trigger> > set_ftrace_filter\n"
	"\t     To remove trigger with a count:\n"
	"\t       echo '!<function>:<trigger>:0 > set_ftrace_filter\n"
	"  set_ftrace_notrace\t- echo function name in here to never trace.\n"
	"\t    accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
	"\t    modules: Can select a group via module command :mod:\n"
	"\t    Does not accept triggers\n"
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_TRACER
	"  set_ftrace_pid\t- Write pid(s) to only function trace those pids\n"
	"\t\t    (function)\n"
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	"  set_graph_function\t- Trace the nested calls of a function (function_graph)\n"
	"  set_graph_notrace\t- Do not trace the nested calls of a function (function_graph)\n"
	"  max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n"
#endif
#ifdef CONFIG_TRACER_SNAPSHOT
	"\n  snapshot\t\t- Like 'trace' but shows the content of the static\n"
	"\t\t\t  snapshot buffer. Read the contents for more\n"
	"\t\t\t  information\n"
#endif
#ifdef CONFIG_STACK_TRACER
	"  stack_trace\t\t- Shows the max stack trace when active\n"
	"  stack_max_size\t- Shows current max stack size that was traced\n"
	"\t\t\t  Write into this file to reset the max size (trigger a\n"
	"\t\t\t  new trace)\n"
#ifdef CONFIG_DYNAMIC_FTRACE
	"  stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n"
	"\t\t\t  traces\n"
#endif
#endif /* CONFIG_STACK_TRACER */
#ifdef CONFIG_KPROBE_EVENTS
	"  kprobe_events\t\t- Add/remove/show the kernel dynamic events\n"
	"\t\t\t  Write into this file to define/undefine new trace events.\n"
#endif
#ifdef CONFIG_UPROBE_EVENTS
	"  uprobe_events\t\t- Add/remove/show the userspace dynamic events\n"
	"\t\t\t  Write into this file to define/undefine new trace events.\n"
#endif
#if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS)
	"\t  accepts: event-definitions (one definition per line)\n"
	"\t   Format: p|r[:[<group>/]<event>] <place> [<args>]\n"
	"\t           -:[<group>/]<event>\n"
#ifdef CONFIG_KPROBE_EVENTS
	"\t    place: [<module>:]<symbol>[+<offset>]|<memaddr>\n"
#endif
#ifdef CONFIG_UPROBE_EVENTS
	"\t    place: <path>:<offset>\n"
#endif
	"\t     args: <name>=fetcharg[:type]\n"
	"\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n"
	"\t           $stack<index>, $stack, $retval, $comm\n"
	"\t     type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string,\n"
	"\t           b<bit-width>@<bit-offset>/<container-size>\n"
#endif
	"  events/\t\t- Directory containing all trace event subsystems:\n"
	"      enable\t\t- Write 0/1 to enable/disable tracing of all events\n"
	"  events/<system>/\t- Directory containing all trace events for <system>:\n"
	"      enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n"
	"\t\t\t  events\n"
	"      filter\t\t- If set, only events passing filter are traced\n"
	"  events/<system>/<event>/\t- Directory containing control files for\n"
	"\t\t\t  <event>:\n"
	"      enable\t\t- Write 0/1 to enable/disable tracing of <event>\n"
	"      filter\t\t- If set, only events passing filter are traced\n"
	"      trigger\t\t- If set, a command to perform when event is hit\n"
	"\t    Format: <trigger>[:count][if <filter>]\n"
	"\t   trigger: traceon, traceoff\n"
	"\t            enable_event:<system>:<event>\n"
	"\t            disable_event:<system>:<event>\n"
#ifdef CONFIG_HIST_TRIGGERS
	"\t            enable_hist:<system>:<event>\n"
	"\t            disable_hist:<system>:<event>\n"
#endif
#ifdef CONFIG_STACKTRACE
	"\t\t    stacktrace\n"
#endif
#ifdef CONFIG_TRACER_SNAPSHOT
	"\t\t    snapshot\n"
#endif
#ifdef CONFIG_HIST_TRIGGERS
	"\t\t    hist (see below)\n"
#endif
	"\t   example: echo traceoff > events/block/block_unplug/trigger\n"
	"\t            echo traceoff:3 > events/block/block_unplug/trigger\n"
	"\t            echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n"
	"\t                  events/block/block_unplug/trigger\n"
	"\t   The first disables tracing every time block_unplug is hit.\n"
	"\t   The second disables tracing the first 3 times block_unplug is hit.\n"
	"\t   The third enables the kmalloc event the first 3 times block_unplug\n"
	"\t     is hit and has value of greater than 1 for the 'nr_rq' event field.\n"
	"\t   Like function triggers, the counter is only decremented if it\n"
	"\t    enabled or disabled tracing.\n"
	"\t   To remove a trigger without a count:\n"
	"\t     echo '!<trigger> > <system>/<event>/trigger\n"
	"\t   To remove a trigger with a count:\n"
	"\t     echo '!<trigger>:0 > <system>/<event>/trigger\n"
	"\t   Filters can be ignored when removing a trigger.\n"
#ifdef CONFIG_HIST_TRIGGERS
	"      hist trigger\t- If set, event hits are aggregated into a hash table\n"
	"\t    Format: hist:keys=<field1[,field2,...]>\n"
	"\t            [:values=<field1[,field2,...]>]\n"
	"\t            [:sort=<field1[,field2,...]>]\n"
	"\t            [:size=#entries]\n"
	"\t            [:pause][:continue][:clear]\n"
	"\t            [:name=histname1]\n"
	"\t            [if <filter>]\n\n"
	"\t    When a matching event is hit, an entry is added to a hash\n"
	"\t    table using the key(s) and value(s) named, and the value of a\n"
	"\t    sum called 'hitcount' is incremented.  Keys and values\n"
	"\t    correspond to fields in the event's format description.  Keys\n"
	"\t    can be any field, or the special string 'stacktrace'.\n"
	"\t    Compound keys consisting of up to two fields can be specified\n"
	"\t    by the 'keys' keyword.  Values must correspond to numeric\n"
	"\t    fields.  Sort keys consisting of up to two fields can be\n"
	"\t    specified using the 'sort' keyword.  The sort direction can\n"
	"\t    be modified by appending '.descending' or '.ascending' to a\n"
	"\t    sort field.  The 'size' parameter can be used to specify more\n"
	"\t    or fewer than the default 2048 entries for the hashtable size.\n"
	"\t    If a hist trigger is given a name using the 'name' parameter,\n"
	"\t    its histogram data will be shared with other triggers of the\n"
	"\t    same name, and trigger hits will update this common data.\n\n"
	"\t    Reading the 'hist' file for the event will dump the hash\n"
	"\t    table in its entirety to stdout.  If there are multiple hist\n"
	"\t    triggers attached to an event, there will be a table for each\n"
	"\t    trigger in the output.  The table displayed for a named\n"
	"\t    trigger will be the same as any other instance having the\n"
	"\t    same name.  The default format used to display a given field\n"
	"\t    can be modified by appending any of the following modifiers\n"
	"\t    to the field name, as applicable:\n\n"
	"\t            .hex        display a number as a hex value\n"
	"\t            .sym        display an address as a symbol\n"
	"\t            .sym-offset display an address as a symbol and offset\n"
	"\t            .execname   display a common_pid as a program name\n"
	"\t            .syscall    display a syscall id as a syscall name\n\n"
	"\t            .log2       display log2 value rather than raw number\n\n"
	"\t    The 'pause' parameter can be used to pause an existing hist\n"
	"\t    trigger or to start a hist trigger but not log any events\n"
	"\t    until told to do so.  'continue' can be used to start or\n"
	"\t    restart a paused hist trigger.\n\n"
	"\t    The 'clear' parameter will clear the contents of a running\n"
	"\t    hist trigger and leave its current paused/active state\n"
	"\t    unchanged.\n\n"
	"\t    The enable_hist and disable_hist triggers can be used to\n"
	"\t    have one event conditionally start and stop another event's\n"
	"\t    already-attached hist trigger.  The syntax is analagous to\n"
	"\t    the enable_event and disable_event triggers.\n"
#endif
;


static ssize_t

tracing_readme_read(struct file *filp, char __user *ubuf,
		       size_t cnt, loff_t *ppos)
{
	return simple_read_from_buffer(ubuf, cnt, ppos,
					readme_msg, strlen(readme_msg));
}

Contributors
Person
Tokens
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Commits
CommitProp
Ingo Molnar
31
77.50%
1
50.00%
Eduard - Gabriel Munteanu
9
22.50%
1
50.00%
Total
40
100.00%
2
100.00%


static const struct file_operations tracing_readme_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_readme_read,
	.llseek		= generic_file_llseek,
};



static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos)
{
	unsigned int *ptr = v;

	if (*pos || m->count)
		ptr++;

	(*pos)++;

	for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num];
	     ptr++) {
		if (*ptr == -1 || *ptr == NO_CMDLINE_MAP)
			continue;

		return ptr;
	}

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
62
72.94%
2
33.33%
Steven Rostedt
17
20.00%
2
33.33%
Avadh Patel
4
4.71%
1
16.67%
Pekka Paalanen
2
2.35%
1
16.67%
Total
85
100.00%
6
100.00%



static void *saved_cmdlines_start(struct seq_file *m, loff_t *pos)
{
	void *v;
	loff_t l = 0;

	preempt_disable();
	arch_spin_lock(&trace_cmdline_lock);

	v = &savedcmd->map_cmdline_to_pid[0];
	while (l <= *pos) {
		v = saved_cmdlines_next(m, v, &l);
		if (!v)
			return NULL;
	}

	return v;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
64
84.21%
2
40.00%
Steven Rostedt
10
13.16%
2
40.00%
Frédéric Weisbecker
2
2.63%
1
20.00%
Total
76
100.00%
5
100.00%



static void saved_cmdlines_stop(struct seq_file *m, void *v)
{
	arch_spin_unlock(&trace_cmdline_lock);
	preempt_enable();
}

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Yoshihiro Yunomae
24
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1
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24
100.00%
1
100.00%



static int saved_cmdlines_show(struct seq_file *m, void *v)
{
	char buf[TASK_COMM_LEN];
	unsigned int *pid = v;

	__trace_find_cmdline(*pid, buf);
	seq_printf(m, "%d %s\n", *pid, buf);
	return 0;
}

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Yoshihiro Yunomae
51
100.00%
1
100.00%
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51
100.00%
1
100.00%


static const struct seq_operations tracing_saved_cmdlines_seq_ops = {
	.start		= saved_cmdlines_start,
	.next		= saved_cmdlines_next,
	.stop		= saved_cmdlines_stop,
	.show		= saved_cmdlines_show,
};



static int tracing_saved_cmdlines_open(struct inode *inode, struct file *filp)
{
	if (tracing_disabled)
		return -ENODEV;

	return seq_open(filp, &tracing_saved_cmdlines_seq_ops);
}

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Yoshihiro Yunomae
33
100.00%
1
100.00%
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33
100.00%
1
100.00%


static const struct file_operations tracing_saved_cmdlines_fops = {
	.open		= tracing_saved_cmdlines_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};


static ssize_t

tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf,
				 size_t cnt, loff_t *ppos)
{
	char buf[64];
	int r;

	arch_spin_lock(&trace_cmdline_lock);
	r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num);
	arch_spin_unlock(&trace_cmdline_lock);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
70
92.11%
1
50.00%
Namhyung Kim
6
7.89%
1
50.00%
Total
76
100.00%
2
100.00%



static void free_saved_cmdlines_buffer(struct saved_cmdlines_buffer *s)
{
	kfree(s->saved_cmdlines);
	kfree(s->map_cmdline_to_pid);
	kfree(s);
}

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Yoshihiro Yunomae
30
100.00%
1
100.00%
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30
100.00%
1
100.00%



static int tracing_resize_saved_cmdlines(unsigned int val)
{
	struct saved_cmdlines_buffer *s, *savedcmd_temp;

	s = kmalloc(sizeof(*s), GFP_KERNEL);
	if (!s)
		return -ENOMEM;

	if (allocate_cmdlines_buffer(val, s) < 0) {
		kfree(s);
		return -ENOMEM;
	}

	arch_spin_lock(&trace_cmdline_lock);
	savedcmd_temp = savedcmd;
	savedcmd = s;
	arch_spin_unlock(&trace_cmdline_lock);
	free_saved_cmdlines_buffer(savedcmd_temp);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
72
80.00%
2
25.00%
Steven Rostedt
10
11.11%
3
37.50%
Frédéric Weisbecker
4
4.44%
1
12.50%
Avadh Patel
2
2.22%
1
12.50%
Namhyung Kim
2
2.22%
1
12.50%
Total
90
100.00%
8
100.00%


static ssize_t

tracing_saved_cmdlines_size_write(struct file *filp, const char __user *ubuf,
				  size_t cnt, loff_t *ppos)
{
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	/* must have at least 1 entry or less than PID_MAX_DEFAULT */
	if (!val || val > PID_MAX_DEFAULT)
		return -EINVAL;

	ret = tracing_resize_saved_cmdlines((unsigned int)val);
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihiro Yunomae
85
90.43%
2
28.57%
Avadh Patel
4
4.26%
1
14.29%
Steven Rostedt
3
3.19%
2
28.57%
Lai Jiangshan
2
2.13%
2
28.57%
Total
94
100.00%
7
100.00%


static const struct file_operations tracing_saved_cmdlines_size_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_saved_cmdlines_size_read,
	.write		= tracing_saved_cmdlines_size_write,
};

#ifdef CONFIG_TRACE_ENUM_MAP_FILE

static union trace_enum_map_item *

update_enum_map(union trace_enum_map_item *ptr)
{
	if (!ptr->map.enum_string) {
		if (ptr->tail.next) {
			ptr = ptr->tail.next;
			/* Set ptr to the next real item (skip head) */
			ptr++;
		} else
			return NULL;
	}
	return ptr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
51
96.23%
5
71.43%
Jiri Olsa
1
1.89%
1
14.29%
Avadh Patel
1
1.89%
1
14.29%
Total
53
100.00%
7
100.00%



static void *enum_map_next(struct seq_file *m, void *v, loff_t *pos)
{
	union trace_enum_map_item *ptr = v;

	/*
         * Paranoid! If ptr points to end, we don't want to increment past it.
         * This really should never happen.
         */
	ptr = update_enum_map(ptr);
	if (WARN_ON_ONCE(!ptr))
		return NULL;

	ptr++;

	(*pos)++;

	ptr = update_enum_map(ptr);

	return ptr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
57
87.69%
6
66.67%
Arnaldo Carvalho de Melo
4
6.15%
1
11.11%
Eduard - Gabriel Munteanu
3
4.62%
1
11.11%
Pekka Paalanen
1
1.54%
1
11.11%
Total
65
100.00%
9
100.00%



static void *enum_map_start(struct seq_file *m, loff_t *pos)
{
	union trace_enum_map_item *v;
	loff_t l = 0;

	mutex_lock(&trace_enum_mutex);

	v = trace_enum_maps;
	if (v)
		v++;

	while (v && l < *pos) {
		v = enum_map_next(m, v, &l);
	}

	return v;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
58
84.06%
3
60.00%
Eduard - Gabriel Munteanu
8
11.59%
1
20.00%
Vaibhav Nagarnaik
3
4.35%
1
20.00%
Total
69
100.00%
5
100.00%



static void enum_map_stop(struct seq_file *m, void *v)
{
	mutex_unlock(&trace_enum_mutex);
}

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Steven Rostedt
21
100.00%
1
100.00%
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21
100.00%
1
100.00%



static int enum_map_show(struct seq_file *m, void *v)
{
	union trace_enum_map_item *ptr = v;

	seq_printf(m, "%s %ld (%s)\n",
		   ptr->map.enum_string, ptr->map.enum_value,
		   ptr->map.system);

	return 0;
}

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Steven Rostedt
50
100.00%
1
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50
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static const struct seq_operations tracing_enum_map_seq_ops = {
	.start		= enum_map_start,
	.next		= enum_map_next,
	.stop		= enum_map_stop,
	.show		= enum_map_show,
};



static int tracing_enum_map_open(struct inode *inode, struct file *filp)
{
	if (tracing_disabled)
		return -ENODEV;

	return seq_open(filp, &tracing_enum_map_seq_ops);
}

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Steven Rostedt
33
100.00%
1
100.00%
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33
100.00%
1
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static const struct file_operations tracing_enum_map_fops = {
	.open		= tracing_enum_map_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};


static inline union trace_enum_map_item *

trace_enum_jmp_to_tail(union trace_enum_map_item *ptr)
{
	/* Return tail of array given the head */
	return ptr + ptr->head.length + 1;
}

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26
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1
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26
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1
100.00%


static void

trace_insert_enum_map_file(struct module *mod, struct trace_enum_map **start,
			   int len)
{
	struct trace_enum_map **stop;
	struct trace_enum_map **map;
	union trace_enum_map_item *map_array;
	union trace_enum_map_item *ptr;

	stop = start + len;

	/*
         * The trace_enum_maps contains the map plus a head and tail item,
         * where the head holds the module and length of array, and the
         * tail holds a pointer to the next list.
         */
	map_array = kmalloc(sizeof(*map_array) * (len + 2), GFP_KERNEL);
	if (!map_array) {
		pr_warn("Unable to allocate trace enum mapping\n");
		return;
	}

	mutex_lock(&trace_enum_mutex);

	if (!trace_enum_maps)
		trace_enum_maps = map_array;
	else {
		ptr = trace_enum_maps;
		for (;;) {
			ptr = trace_enum_jmp_to_tail(ptr);
			if (!ptr->tail.next)
				break;
			ptr = ptr->tail.next;

		}
		ptr->tail.next = map_array;
	}
	map_array->head.mod = mod;
	map_array->head.length = len;
	map_array++;

	for (map = start; (unsigned long)map < (unsigned long)stop; map++) {
		map_array->map = **map;
		map_array++;
	}
	memset(map_array, 0, sizeof(*map_array));

	mutex_unlock(&trace_enum_mutex);
}

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Steven Rostedt
214
99.53%
1
50.00%
Joe Perches
1
0.47%
1
50.00%
Total
215
100.00%
2
100.00%



static void trace_create_enum_file(struct dentry *d_tracer)
{
	trace_create_file("enum_map", 0444, d_tracer,
			  NULL, &tracing_enum_map_fops);
}

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25
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1
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25
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1
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#else /* CONFIG_TRACE_ENUM_MAP_FILE */


static inline void trace_create_enum_file(struct dentry *d_tracer) { }
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11
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static inline void trace_insert_enum_map_file(struct module *mod,
			      struct trace_enum_map **start, int len) { }
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20
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#endif /* !CONFIG_TRACE_ENUM_MAP_FILE */



static void trace_insert_enum_map(struct module *mod,
				  struct trace_enum_map **start, int len)
{
	struct trace_enum_map **map;

	if (len <= 0)
		return;

	map = start;

	trace_event_enum_update(map, len);

	trace_insert_enum_map_file(mod, start, len);
}

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53
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static ssize_t

tracing_set_trace_read(struct file *filp, char __user *ubuf,
		       size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[MAX_TRACER_SIZE+2];
	int r;

	mutex_lock(&trace_types_lock);
	r = sprintf(buf, "%s\n", tr->current_trace->name);
	mutex_unlock(&trace_types_lock);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

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int tracer_init(struct tracer *t, struct trace_array *tr)
{
	tracing_reset_online_cpus(&tr->trace_buffer);
	return t->init(tr);
}

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static void set_buffer_entries(struct trace_buffer *buf, unsigned long val)
{
	int cpu;

	for_each_tracing_cpu(cpu)
		per_cpu_ptr(buf->data, cpu)->entries = val;
}

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Vaibhav Nagarnaik
17
48.57%
1
20.00%
Eduard - Gabriel Munteanu
10
28.57%
1
20.00%
Steven Rostedt
8
22.86%
3
60.00%
Total
35
100.00%
5
100.00%

#ifdef CONFIG_TRACER_MAX_TRACE
/* resize @tr's buffer to the size of @size_tr's entries */


static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
					struct trace_buffer *size_buf, int cpu_id)
{
	int cpu, ret = 0;

	if (cpu_id == RING_BUFFER_ALL_CPUS) {
		for_each_tracing_cpu(cpu) {
			ret = ring_buffer_resize(trace_buf->buffer,
				 per_cpu_ptr(size_buf->data, cpu)->entries, cpu);
			if (ret < 0)
				break;
			per_cpu_ptr(trace_buf->data, cpu)->entries =
				per_cpu_ptr(size_buf->data, cpu)->entries;
		}
	} else {
		ret = ring_buffer_resize(trace_buf->buffer,
				 per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id);
		if (ret == 0)
			per_cpu_ptr(trace_buf->data, cpu_id)->entries =
				per_cpu_ptr(size_buf->data, cpu_id)->entries;
	}

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Hiraku Toyooka
74
50.34%
1
20.00%
Steven Rostedt
69
46.94%
3
60.00%
Lai Jiangshan
4
2.72%
1
20.00%
Total
147
100.00%
5
100.00%

#endif /* CONFIG_TRACER_MAX_TRACE */



static int __tracing_resize_ring_buffer(struct trace_array *tr,
					unsigned long size, int cpu)
{
	int ret;

	/*
         * If kernel or user changes the size of the ring buffer
         * we use the size that was given, and we can forget about
         * expanding it later.
         */
	ring_buffer_expanded = true;

	/* May be called before buffers are initialized */
	if (!tr->trace_buffer.buffer)
		return 0;

	ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu);
	if (ret < 0)
		return ret;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) ||
	    !tr->current_trace->use_max_tr)
		goto out;

	ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu);
	if (ret < 0) {
		int r = resize_buffer_duplicate_size(&tr->trace_buffer,
						     &tr->trace_buffer, cpu);
		if (r < 0) {
			/*
                         * AARGH! We are left with different
                         * size max buffer!!!!
                         * The max buffer is our "snapshot" buffer.
                         * When a tracer needs a snapshot (one of the
                         * latency tracers), it swaps the max buffer
                         * with the saved snap shot. We succeeded to
                         * update the size of the main buffer, but failed to
                         * update the size of the max buffer. But when we tried
                         * to reset the main buffer to the original size, we
                         * failed there too. This is very unlikely to
                         * happen, but if it does, warn and kill all
                         * tracing.
                         */
			WARN_ON(1);
			tracing_disabled = 1;
		}
		return ret;
	}

	if (cpu == RING_BUFFER_ALL_CPUS)
		set_buffer_entries(&tr->max_buffer, size);
	else
		per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size;

 out:
#endif /* CONFIG_TRACER_MAX_TRACE */

	if (cpu == RING_BUFFER_ALL_CPUS)
		set_buffer_entries(&tr->trace_buffer, size);
	else
		per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size;

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
118
53.39%
10
50.00%
Vaibhav Nagarnaik
37
16.74%
2
10.00%
Eduard - Gabriel Munteanu
29
13.12%
1
5.00%
Motohiro Kosaki
10
4.52%
1
5.00%
Frédéric Weisbecker
9
4.07%
1
5.00%
Jens Axboe
8
3.62%
1
5.00%
Hiraku Toyooka
5
2.26%
2
10.00%
Lai Jiangshan
5
2.26%
2
10.00%
Total
221
100.00%
20
100.00%



static ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
					  unsigned long size, int cpu_id)
{
	int ret = size;

	mutex_lock(&trace_types_lock);

	if (cpu_id != RING_BUFFER_ALL_CPUS) {
		/* make sure, this cpu is enabled in the mask */
		if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) {
			ret = -EINVAL;
			goto out;
		}
	}

	ret = __tracing_resize_ring_buffer(tr, size, cpu_id);
	if (ret < 0)
		ret = -ENOMEM;

out:
	mutex_unlock(&trace_types_lock);

	return ret;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Vaibhav Nagarnaik
56
61.54%
2
40.00%
Eduard - Gabriel Munteanu
28
30.77%
1
20.00%
Steven Rostedt
7
7.69%
2
40.00%
Total
91
100.00%
5
100.00%

/**
 * tracing_update_buffers - used by tracing facility to expand ring buffers
 *
 * To save on memory when the tracing is never used on a system with it
 * configured in. The ring buffers are set to a minimum size. But once
 * a user starts to use the tracing facility, then they need to grow
 * to their default size.
 *
 * This function is to be called when a tracer is about to be used.
 */


int tracing_update_buffers(void)
{
	int ret = 0;

	mutex_lock(&trace_types_lock);
	if (!ring_buffer_expanded)
		ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size,
						RING_BUFFER_ALL_CPUS);
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
23
52.27%
3
42.86%
Eduard - Gabriel Munteanu
9
20.45%
1
14.29%
Jens Axboe
9
20.45%
1
14.29%
Vaibhav Nagarnaik
3
6.82%
2
28.57%
Total
44
100.00%
7
100.00%

struct trace_option_dentry;

static void
create_trace_option_files(struct trace_array *tr, struct tracer *tracer);

/*
 * Used to clear out the tracer before deletion of an instance.
 * Must have trace_types_lock held.
 */


static void tracing_set_nop(struct trace_array *tr)
{
	if (tr->current_trace == &nop_trace)
		return;
	
	tr->current_trace->enabled--;

	if (tr->current_trace->reset)
		tr->current_trace->reset(tr);

	tr->current_trace = &nop_trace;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
47
90.38%
2
66.67%
Vaibhav Nagarnaik
5
9.62%
1
33.33%
Total
52
100.00%
3
100.00%



static void add_tracer_options(struct trace_array *tr, struct tracer *t)
{
	/* Only enable if the directory has been created already. */
	if (!tr->dir)
		return;

	create_trace_option_files(tr, t);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
24
75.00%
4
80.00%
Vaibhav Nagarnaik
8
25.00%
1
20.00%
Total
32
100.00%
5
100.00%



static int tracing_set_tracer(struct trace_array *tr, const char *buf)
{
	struct tracer *t;
#ifdef CONFIG_TRACER_MAX_TRACE
	bool had_max_tr;
#endif
	int ret = 0;

	mutex_lock(&trace_types_lock);

	if (!ring_buffer_expanded) {
		ret = __tracing_resize_ring_buffer(tr, trace_buf_size,
						RING_BUFFER_ALL_CPUS);
		if (ret < 0)
			goto out;
		ret = 0;
	}

	for (t = trace_types; t; t = t->next) {
		if (strcmp(t->name, buf) == 0)
			break;
	}
	if (!t) {
		ret = -EINVAL;
		goto out;
	}
	if (t == tr->current_trace)
		goto out;

	/* Some tracers are only allowed for the top level buffer */
	if (!trace_ok_for_array(t, tr)) {
		ret = -EINVAL;
		goto out;
	}

	/* If trace pipe files are being read, we can't change the tracer */
	if (tr->current_trace->ref) {
		ret = -EBUSY;
		goto out;
	}

	trace_branch_disable();

	tr->current_trace->enabled--;

	if (tr->current_trace->reset)
		tr->current_trace->reset(tr);

	/* Current trace needs to be nop_trace before synchronize_sched */
	tr->current_trace = &nop_trace;

#ifdef CONFIG_TRACER_MAX_TRACE
	had_max_tr = tr->allocated_snapshot;

	if (had_max_tr && !t->use_max_tr) {
		/*
                 * We need to make sure that the update_max_tr sees that
                 * current_trace changed to nop_trace to keep it from
                 * swapping the buffers after we resize it.
                 * The update_max_tr is called from interrupts disabled
                 * so a synchronized_sched() is sufficient.
                 */
		synchronize_sched();
		free_snapshot(tr);
	}
#endif

#ifdef CONFIG_TRACER_MAX_TRACE
	if (t->use_max_tr && !had_max_tr) {
		ret = alloc_snapshot(tr);
		if (ret < 0)
			goto out;
	}
#endif

	if (t->init) {
		ret = tracer_init(t, tr);
		if (ret)
			goto out;
	}

	tr->current_trace = t;
	tr->current_trace->enabled++;
	trace_branch_enable(tr);
 out:
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
209
65.72%
16
59.26%
Vaibhav Nagarnaik
51
16.04%
2
7.41%
Frédéric Weisbecker
26
8.18%
3
11.11%
Motohiro Kosaki
15
4.72%
1
3.70%
Anton Vorontsov
5
1.57%
1
3.70%
Peter Zijlstra
4
1.26%
1
3.70%
Eduard - Gabriel Munteanu
4
1.26%
1
3.70%
Arnaldo Carvalho de Melo
3
0.94%
1
3.70%
Hiraku Toyooka
1
0.31%
1
3.70%
Total
318
100.00%
27
100.00%


static ssize_t

tracing_set_trace_write(struct file *filp, const char __user *ubuf,
			size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[MAX_TRACER_SIZE+1];
	int i;
	size_t ret;
	int err;

	ret = cnt;

	if (cnt > MAX_TRACER_SIZE)
		cnt = MAX_TRACER_SIZE;

	if (copy_from_user(buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	/* strip ending whitespace. */
	for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
		buf[i] = 0;

	err = tracing_set_tracer(tr, buf);
	if (err)
		return err;

	*ppos += ret;

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Peter Zijlstra
61
43.26%
1
5.88%
Steven Rostedt
36
25.53%
8
47.06%
Eduard - Gabriel Munteanu
24
17.02%
1
5.88%
Frédéric Weisbecker
7
4.96%
2
11.76%
Vaibhav Nagarnaik
6
4.26%
2
11.76%
Li Zefan
3
2.13%
1
5.88%
Jiri Olsa
2
1.42%
1
5.88%
Peter Hüwe
2
1.42%
1
5.88%
Total
141
100.00%
17
100.00%


static ssize_t

tracing_nsecs_read(unsigned long *ptr, char __user *ubuf,
		   size_t cnt, loff_t *ppos)
{
	char buf[64];
	int r;

	r = snprintf(buf, sizeof(buf), "%ld\n",
		     *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr));
	if (r > sizeof(buf))
		r = sizeof(buf);
	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vaibhav Nagarnaik
58
61.05%
3
50.00%
Steven Rostedt
33
34.74%
2
33.33%
Stanislav Fomichev
4
4.21%
1
16.67%
Total
95
100.00%
6
100.00%


static ssize_t

tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf,
		    size_t cnt, loff_t *ppos)
{
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	*ptr = val * 1000;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
32
51.61%
3
37.50%
Vaibhav Nagarnaik
22
35.48%
2
25.00%
Stanislav Fomichev
4
6.45%
1
12.50%
Peter Hüwe
3
4.84%
1
12.50%
Hannes Eder
1
1.61%
1
12.50%
Total
62
100.00%
8
100.00%


static ssize_t

tracing_thresh_read(struct file *filp, char __user *ubuf,
		    size_t cnt, loff_t *ppos)
{
	return tracing_nsecs_read(&tracing_thresh, ubuf, cnt, ppos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stanislav Fomichev
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%


static ssize_t

tracing_thresh_write(struct file *filp, const char __user *ubuf,
		     size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	int ret;

	mutex_lock(&trace_types_lock);
	ret = tracing_nsecs_write(&tracing_thresh, ubuf, cnt, ppos);
	if (ret < 0)
		goto out;

	if (tr->current_trace->update_thresh) {
		ret = tr->current_trace->update_thresh(tr);
		if (ret < 0)
			goto out;
	}

	ret = cnt;
out:
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stanislav Fomichev
110
100.00%
1
100.00%
Total
110
100.00%
1
100.00%

#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)


static ssize_t

tracing_max_lat_read(struct file *filp, char __user *ubuf,
		     size_t cnt, loff_t *ppos)
{
	return tracing_nsecs_read(filp->private_data, ubuf, cnt, ppos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stanislav Fomichev
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%


static ssize_t

tracing_max_lat_write(struct file *filp, const char __user *ubuf,
		      size_t cnt, loff_t *ppos)
{
	return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stanislav Fomichev
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%

#endif



static int tracing_open_pipe(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	int ret = 0;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	mutex_lock(&trace_types_lock);

	/* create a buffer to store the information to pass to userspace */
	iter = kzalloc(sizeof(*iter), GFP_KERNEL);
	if (!iter) {
		ret = -ENOMEM;
		__trace_array_put(tr);
		goto out;
	}

	trace_seq_init(&iter->seq);
	iter->trace = tr->current_trace;

	if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
		ret = -ENOMEM;
		goto fail;
	}

	/* trace pipe does not show start of buffer */
	cpumask_setall(iter->started);

	if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
		iter->iter_flags |= TRACE_FILE_LAT_FMT;

	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
	if (trace_clocks[tr->clock_id].in_ns)
		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;

	iter->tr = tr;
	iter->trace_buffer = &tr->trace_buffer;
	iter->cpu_file = tracing_get_cpu(inode);
	mutex_init(&iter->mutex);
	filp->private_data = iter;

	if (iter->trace->pipe_open)
		iter->trace->pipe_open(iter);

	nonseekable_open(inode, filp);

	tr->current_trace->ref++;
out:
	mutex_unlock(&trace_types_lock);
	return ret;

fail:
	kfree(iter->trace);
	kfree(iter);
	__trace_array_put(tr);
	mutex_unlock(&trace_types_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
152
53.71%
12
44.44%
Frédéric Weisbecker
30
10.60%
2
7.41%
Pekka Paalanen
25
8.83%
1
3.70%
Vaibhav Nagarnaik
14
4.95%
1
3.70%
Rusty Russell
12
4.24%
1
3.70%
David Sharp
11
3.89%
1
3.70%
Oleg Nesterov
11
3.89%
1
3.70%
Zhao Lei
11
3.89%
1
3.70%
Alexander Z Lam
5
1.77%
1
3.70%
Arnd Bergmann
4
1.41%
1
3.70%
Yoshihiro Yunomae
3
1.06%
1
3.70%
Thomas Gleixner
2
0.71%
1
3.70%
Marcin Ślusarz
1
0.35%
1
3.70%
Carsten Emde
1
0.35%
1
3.70%
Mandeep Singh Baines
1
0.35%
1
3.70%
Total
283
100.00%
27
100.00%



static int tracing_release_pipe(struct inode *inode, struct file *file)
{
	struct trace_iterator *iter = file->private_data;
	struct trace_array *tr = inode->i_private;

	mutex_lock(&trace_types_lock);

	tr->current_trace->ref--;

	if (iter->trace->pipe_close)
		iter->trace->pipe_close(iter);

	mutex_unlock(&trace_types_lock);

	free_cpumask_var(iter->started);
	mutex_destroy(&iter->mutex);
	kfree(iter);

	trace_array_put(tr);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
43
43.88%
5
45.45%
Zhao Lei
33
33.67%
1
9.09%
Frédéric Weisbecker
13
13.27%
2
18.18%
David Sharp
5
5.10%
1
9.09%
Oleg Nesterov
2
2.04%
1
9.09%
Rusty Russell
2
2.04%
1
9.09%
Total
98
100.00%
11
100.00%


static unsigned int

trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table)
{
	struct trace_array *tr = iter->tr;

	/* Iterators are static, they should be filled or empty */
	if (trace_buffer_iter(iter, iter->cpu_file))
		return POLLIN | POLLRDNORM;

	if (tr->trace_flags & TRACE_ITER_BLOCK)
		/*
                 * Always select as readable when in blocking mode
                 */
		return POLLIN | POLLRDNORM;
	else
		return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file,
					     filp, poll_table);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
38
47.50%
4
66.67%
Li Zefan
23
28.75%
1
16.67%
Soeren Sandmann Pedersen
19
23.75%
1
16.67%
Total
80
100.00%
6
100.00%


static unsigned int

tracing_poll_pipe(struct file *filp, poll_table *poll_table)
{
	struct trace_iterator *iter = filp->private_data;

	return trace_poll(iter, filp, poll_table);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hiraku Toyooka
18
51.43%
1
50.00%
Steven Rostedt
17
48.57%
1
50.00%
Total
35
100.00%
2
100.00%

/* Must be called with iter->mutex held. */


static int tracing_wait_pipe(struct file *filp)
{
	struct trace_iterator *iter = filp->private_data;
	int ret;

	while (trace_empty(iter)) {

		if ((filp->f_flags & O_NONBLOCK)) {
			return -EAGAIN;
		}

		/*
                 * We block until we read something and tracing is disabled.
                 * We still block if tracing is disabled, but we have never
                 * read anything. This allows a user to cat this file, and
                 * then enable tracing. But after we have read something,
                 * we give an EOF when tracing is again disabled.
                 *
                 * iter->pos will be 0 if we haven't read anything.
                 */
		if (!tracing_is_on() && iter->pos)
			break;

		mutex_unlock(&iter->mutex);

		ret = wait_on_pipe(iter, false);

		mutex_lock(&iter->mutex);

		if (ret)
			return ret;
	}

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduard - Gabriel Munteanu
51
53.68%
1
14.29%
Steven Rostedt
23
24.21%
3
42.86%
Hiraku Toyooka
13
13.68%
1
14.29%
Frédéric Weisbecker
6
6.32%
1
14.29%
Rabin Vincent
2
2.11%
1
14.29%
Total
95
100.00%
7
100.00%

/*
 * Consumer reader.
 */

static ssize_t

tracing_read_pipe(struct file *filp, char __user *ubuf,
		  size_t cnt, loff_t *ppos)
{
	struct trace_iterator *iter = filp->private_data;
	ssize_t sret;

	/*
         * Avoid more than one consumer on a single file descriptor
         * This is just a matter of traces coherency, the ring buffer itself
         * is protected.
         */
	mutex_lock(&iter->mutex);

	/* return any leftover data */
	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
	if (sret != -EBUSY)
		goto out;

	trace_seq_init(&iter->seq);

	if (iter->trace->read) {
		sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
		if (sret)
			goto out;
	}

waitagain:
	sret = tracing_wait_pipe(filp);
	if (sret <= 0)
		goto out;

	/* stop when tracing is finished */
	if (trace_empty(iter)) {
		sret = 0;
		goto out;
	}

	if (cnt >= PAGE_SIZE)
		cnt = PAGE_SIZE - 1;

	/* reset all but tr, trace, and overruns */
	memset(&iter->seq, 0,
	       sizeof(struct trace_iterator) -
	       offsetof(struct trace_iterator, seq));
	cpumask_clear(iter->started);
	iter->pos = -1;

	trace_event_read_lock();
	trace_access_lock(iter->cpu_file);
	while (trace_find_next_entry_inc(iter) != NULL) {
		enum print_line_t ret;
		int save_len = iter->seq.seq.len;

		ret = print_trace_line(iter);
		if (ret == TRACE_TYPE_PARTIAL_LINE) {
			/* don't print partial lines */
			iter->seq.seq.len = save_len;
			break;
		}
		if (ret != TRACE_TYPE_NO_CONSUME)
			trace_consume(iter);

		if (trace_seq_used(&iter->seq) >= cnt)
			break;

		/*
                 * Setting the full flag means we reached the trace_seq buffer
                 * size and we should leave by partial output condition above.
                 * One of the trace_seq_* functions is not used properly.
                 */
		WARN_ONCE(iter->seq.full, "full flag set for trace type %d",
			  iter->ent->type);
	}
	trace_access_unlock(iter->cpu_file);
	trace_event_read_unlock();

	/* Now copy what we have to the user */
	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
	if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq))
		trace_seq_init(&iter->seq);

	/*
         * If there was nothing to send to user, in spite of consuming trace
         * entries, go back to wait for more entries.
         */
	if (sret == -EBUSY)
		goto waitagain;

out:
	mutex_unlock(&iter->mutex);

	return sret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
197
51.98%
13
48.15%
Hiraku Toyooka
84
22.16%
1
3.70%
Pekka Paalanen
37
9.76%
2
7.41%
Jiri Olsa
17
4.49%
1
3.70%
Lai Jiangshan
15
3.96%
2
7.41%
Frédéric Weisbecker
13
3.43%
3
11.11%
Andrey Vagin
7
1.85%
1
3.70%
Eduard - Gabriel Munteanu
6
1.58%
1
3.70%
Arnd Bergmann
1
0.26%
1
3.70%
Lucas De Marchi
1
0.26%
1
3.70%
Jason Wessel
1
0.26%
1
3.70%
Total
379
100.00%
27
100.00%



static void tracing_spd_release_pipe(struct splice_pipe_desc *spd,
				     unsigned int idx)
{
	__free_page(spd->pages[idx]);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduard - Gabriel Munteanu
22
88.00%
1
50.00%
Steven Rostedt
3
12.00%
1
50.00%
Total
25
100.00%
2
100.00%


static const struct pipe_buf_operations tracing_pipe_buf_ops = {
	.can_merge		= 0,
	.confirm		= generic_pipe_buf_confirm,
	.release		= generic_pipe_buf_release,
	.steal			= generic_pipe_buf_steal,
	.get			= generic_pipe_buf_get,
};


static size_t

tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
{
	size_t count;
	int save_len;
	int ret;

	/* Seq buffer is page-sized, exactly what we need. */
	for (;;) {
		save_len = iter->seq.seq.len;
		ret = print_trace_line(iter);

		if (trace_seq_has_overflowed(&iter->seq)) {
			iter->seq.seq.len = save_len;
			break;
		}

		/*
                 * This should not be hit, because it should only
                 * be set if the iter->seq overflowed. But check it
                 * anyway to be safe.
                 */
		if (ret == TRACE_TYPE_PARTIAL_LINE) {
			iter->seq.seq.len = save_len;
			break;
		}

		count = trace_seq_used(&iter->seq) - save_len;
		if (rem < count) {
			rem = 0;
			iter->seq.seq.len = save_len;
			break;
		}

		if (ret != TRACE_TYPE_NO_CONSUME)
			trace_consume(iter);
		rem -= count;
		if (!trace_find_next_entry_inc(iter))	{
			rem = 0;
			iter->ent = NULL;
			break;
		}
	}

	return rem;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
147
89.09%
4
50.00%
Vaibhav Nagarnaik
11
6.67%
2
25.00%
Lai Jiangshan
6
3.64%
1
12.50%
Jason Wessel
1
0.61%
1
12.50%
Total
165
100.00%
8
100.00%



static ssize_t tracing_splice_read_pipe(struct file *filp,
					loff_t *ppos,
					struct pipe_inode_info *pipe,
					size_t len,
					unsigned int flags)
{
	struct page *pages_def[PIPE_DEF_BUFFERS];
	struct partial_page partial_def[PIPE_DEF_BUFFERS];
	struct trace_iterator *iter = filp->private_data;
	struct splice_pipe_desc spd = {
		.pages		= pages_def,
		.partial	= partial_def,
		.nr_pages	= 0, /* This gets updated below. */
		.nr_pages_max	= PIPE_DEF_BUFFERS,
		.flags		= flags,
		.ops		= &tracing_pipe_buf_ops,
		.spd_release	= tracing_spd_release_pipe,
        };
	ssize_t ret;
	size_t rem;
	unsigned int i;

	if (splice_grow_spd(pipe, &spd))
		return -ENOMEM;

	mutex_lock(&iter->mutex);

	if (iter->trace->splice_read) {
		ret = iter->trace->splice_read(iter, filp,
					       ppos, pipe, len, flags);
		if (ret)
			goto out_err;
	}

	ret = tracing_wait_pipe(filp);
	if (ret <= 0)
		goto out_err;

	if (!iter->ent && !trace_find_next_entry_inc(iter)) {
		ret = -EFAULT;
		goto out_err;
	}

	trace_event_read_lock();
	trace_access_lock(iter->cpu_file);

	/* Fill as many pages as possible. */
	for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) {
		spd.pages[i] = alloc_page(GFP_KERNEL);
		if (!spd.pages[i])
			break;

		rem = tracing_fill_pipe_page(rem, iter);

		/* Copy the data into the page, so we can start over. */
		ret = trace_seq_to_buffer(&iter->seq,
					  page_address(spd.pages[i]),
					  trace_seq_used(&iter->seq));
		if (ret < 0) {
			__free_page(spd.pages[i]);
			break;
		}
		spd.partial[i].offset = 0;
		spd.partial[i].len = trace_seq_used(&iter->seq);

		trace_seq_init(&iter->seq);
	}

	trace_access_unlock(iter->cpu_file);
	trace_event_read_unlock();
	mutex_unlock(&iter->mutex);

	spd.nr_pages = i;

	if (i)
		ret = splice_to_pipe(pipe, &spd);
	else
		ret = 0;
out:
	splice_shrink_spd(&spd);
	return ret;

out_err:
	mutex_unlock(&iter->mutex);
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eduard - Gabriel Munteanu
198
47.14%
1
3.85%
Steven Rostedt
98
23.33%
11
42.31%
Lai Jiangshan
40
9.52%
4
15.38%
Jens Axboe
40
9.52%
1
3.85%
Frédéric Weisbecker
13
3.10%
1
3.85%
Pekka Paalanen
9
2.14%
1
3.85%
Zhao Lei
7
1.67%
1
3.85%
Li Zefan
6
1.43%
1
3.85%
Al Viro
3
0.71%
1
3.85%
Arnd Bergmann
2
0.48%
1
3.85%
Eric Dumazet
2
0.48%
1
3.85%
Hiraku Toyooka
1
0.24%
1
3.85%
Jason Wessel
1
0.24%
1
3.85%
Total
420
100.00%
26
100.00%


static ssize_t

tracing_entries_read(struct file *filp, char __user *ubuf,
		     size_t cnt, loff_t *ppos)
{
	struct inode *inode = file_inode(filp);
	struct trace_array *tr = inode->i_private;
	int cpu = tracing_get_cpu(inode);
	char buf[64];
	int r = 0;
	ssize_t ret;

	mutex_lock(&trace_types_lock);

	if (cpu == RING_BUFFER_ALL_CPUS) {
		int cpu, buf_size_same;
		unsigned long size;

		size = 0;
		buf_size_same = 1;
		/* check if all cpu sizes are same */
		for_each_tracing_cpu(cpu) {
			/* fill in the size from first enabled cpu */
			if (size == 0)
				size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries;
			if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) {
				buf_size_same = 0;
				break;
			}
		}

		if (buf_size_same) {
			if (!ring_buffer_expanded)
				r = sprintf(buf, "%lu (expanded: %lu)\n",
					    size >> 10,
					    trace_buf_size >> 10);
			else
				r = sprintf(buf, "%lu\n", size >> 10);
		} else
			r = sprintf(buf, "X\n");
	} else
		r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10);

	mutex_unlock(&trace_types_lock);

	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vaibhav Nagarnaik
126
50.60%
1
14.29%
Steven Rostedt
80
32.13%
4
57.14%
Eduard - Gabriel Munteanu
28
11.24%
1
14.29%
Oleg Nesterov
15
6.02%
1
14.29%
Total
249
100.00%
7
100.00%


static ssize_t

tracing_entries_write(struct file *filp, const char __user *ubuf,
		      size_t cnt, loff_t *ppos)
{
	struct inode *inode = file_inode(filp);
	struct trace_array *tr = inode->i_private;
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	/* must have at least 1 entry */
	if (!val)
		return -EINVAL;

	/* value is in KB */
	val <<= 10;
	ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode));
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
65
55.56%
10
62.50%
Eduard - Gabriel Munteanu
22
18.80%
1
6.25%
Oleg Nesterov
17
14.53%
1
6.25%
Vaibhav Nagarnaik
8
6.84%
2
12.50%
Peter Hüwe
3
2.56%
1
6.25%
Jiri Olsa
2
1.71%
1
6.25%
Total
117
100.00%
16
100.00%


static ssize_t

tracing_total_entries_read(struct file *filp, char __user *ubuf,
				size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[64];
	int r, cpu;
	unsigned long size = 0, expanded_size = 0;

	mutex_lock(&trace_types_lock);
	for_each_tracing_cpu(cpu) {
		size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10;
		if (!ring_buffer_expanded)
			expanded_size += trace_buf_size >> 10;
	}
	if (ring_buffer_expanded)
		r = sprintf(buf, "%lu\n", size);
	else
		r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size);
	mutex_unlock(&trace_types_lock);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vaibhav Nagarnaik
136
95.77%
3
60.00%
Steven Rostedt
6
4.23%
2
40.00%
Total
142
100.00%
5
100.00%


static ssize_t

tracing_free_buffer_write(struct file *filp, const char __user *ubuf,
			  size_t cnt, loff_t *ppos)
{
	/*
         * There is no need to read what the user has written, this function
         * is just to make sure that there is no error when "echo" is used
         */

	*ppos += cnt;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vaibhav Nagarnaik
30
90.91%
2
66.67%
Steven Rostedt
3
9.09%
1
33.33%
Total
33
100.00%
3
100.00%


static int

tracing_free_buffer_release(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;

	/* disable tracing ? */
	if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE)
		tracer_tracing_off(tr);
	/* resize the ring buffer to 0 */
	tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);

	trace_array_put(tr);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
29
50.88%
6
66.67%
Vaibhav Nagarnaik
24
42.11%
2
22.22%
Alexander Z Lam
4
7.02%
1
11.11%
Total
57
100.00%
9
100.00%


static ssize_t

tracing_mark_write(struct file *filp, const char __user *ubuf,
					size_t cnt, loff_t *fpos)
{
	struct trace_array *tr = filp->private_data;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct print_entry *entry;
	unsigned long irq_flags;
	const char faulted[] = "<faulted>";
	ssize_t written;
	int size;
	int len;

/* Used in tracing_mark_raw_write() as well */

#define FAULTED_SIZE (sizeof(faulted) - 1) /* '\0' is already accounted for */

	if (tracing_disabled)
		return -EINVAL;

	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
		return -EINVAL;

	if (cnt > TRACE_BUF_SIZE)
		cnt = TRACE_BUF_SIZE;

	BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);

	local_save_flags(irq_flags);
	size = sizeof(*entry) + cnt + 2; /* add '\0' and possible '\n' */

	/* If less than "<faulted>", then make sure we can still add that */
	if (cnt < FAULTED_SIZE)
		size += FAULTED_SIZE - cnt;

	buffer = tr->trace_buffer.buffer;
	event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
					    irq_flags, preempt_count());
	if (unlikely(!event))
		/* Ring buffer disabled, return as if not open for write */
		return -EBADF;

	entry = ring_buffer_event_data(event);
	entry->ip = _THIS_IP_;

	len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt);
	if (len) {
		memcpy(&entry->buf, faulted, FAULTED_SIZE);
		cnt = FAULTED_SIZE;
		written = -EFAULT;
	} else
		written = cnt;
	len = cnt;

	if (entry->buf[cnt - 1] != '\n') {
		entry->buf[cnt] = '\n';
		entry->buf[cnt + 1] = '\0';
	} else
		entry->buf[cnt] = '\0';

	__buffer_unlock_commit(buffer, event);

	if (written > 0)
		*fpos += written;

	return written;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
223
71.70%
11
61.11%
Vaibhav Nagarnaik
71
22.83%
3
16.67%
Pekka Paalanen
11
3.54%
1
5.56%
Marcin Ślusarz
3
0.96%
1
5.56%
Mandeep Singh Baines
2
0.64%
1
5.56%
Alexander Z Lam
1
0.32%
1
5.56%
Total
311
100.00%
18
100.00%

/* Limit it for now to 3K (including tag) */

#define RAW_DATA_MAX_SIZE (1024*3)


static ssize_t

tracing_mark_raw_write(struct file *filp, const char __user *ubuf,
					size_t cnt, loff_t *fpos)
{
	struct trace_array *tr = filp->private_data;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct raw_data_entry *entry;
	const char faulted[] = "<faulted>";
	unsigned long irq_flags;
	ssize_t written;
	int size;
	int len;


#define FAULT_SIZE_ID (FAULTED_SIZE + sizeof(int))

	if (tracing_disabled)
		return -EINVAL;

	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
		return -EINVAL;

	/* The marker must at least have a tag id */
	if (cnt < sizeof(unsigned int) || cnt > RAW_DATA_MAX_SIZE)
		return -EINVAL;

	if (cnt > TRACE_BUF_SIZE)
		cnt = TRACE_BUF_SIZE;

	BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);

	local_save_flags(irq_flags);
	size = sizeof(*entry) + cnt;
	if (cnt < FAULT_SIZE_ID)
		size += FAULT_SIZE_ID - cnt;

	buffer = tr->trace_buffer.buffer;
	event = __trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size,
					    irq_flags, preempt_count());
	if (!event)
		/* Ring buffer disabled, return as if not open for write */
		return -EBADF;

	entry = ring_buffer_event_data(event);

	len = __copy_from_user_inatomic(&entry->id, ubuf, cnt);
	if (len) {
		entry->id = -1;
		memcpy(&entry->buf, faulted, FAULTED_SIZE);
		written = -EFAULT;
	} else
		written = cnt;

	__buffer_unlock_commit(buffer, event);

	if (written > 0)
		*fpos += written;

	return written;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
169
62.83%
7
58.33%
Pekka Paalanen
64
23.79%
1
8.33%
Mandeep Singh Baines
16
5.95%
1
8.33%
Alexander Z Lam
11
4.09%
1
8.33%
Marcin Ślusarz
6
2.23%
1
8.33%
Carsten Emde
3
1.12%
1
8.33%
Total
269
100.00%
12
100.00%



static int tracing_clock_show(struct seq_file *m, void *v)
{
	struct trace_array *tr = m->private;
	int i;

	for (i = 0; i < ARRAY_SIZE(trace_clocks); i++)
		seq_printf(m,
			"%s%s%s%s", i ? " " : "",
			i == tr->clock_id ? "[" : "", trace_clocks[i].name,
			i == tr->clock_id ? "]" : "");
	seq_putc(m, '\n');

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Zhao Lei
66
70.97%
1
33.33%
Steven Rostedt
15
16.13%
1
33.33%
Li Zefan
12
12.90%
1
33.33%
Total
93
100.00%
3
100.00%



static int tracing_set_clock(struct trace_array *tr, const char *clockstr)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) {
		if (strcmp(trace_clocks[i].name, clockstr) == 0)
			break;
	}
	if (i == ARRAY_SIZE(trace_clocks))
		return -EINVAL;

	mutex_lock(&trace_types_lock);

	tr->clock_id = i;

	ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func);

	/*
         * New clock may not be consistent with the previous clock.
         * Reset the buffer so that it doesn't have incomparable timestamps.
         */
	tracing_reset_online_cpus(&tr->trace_buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer)
		ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func);
	tracing_reset_online_cpus(&tr->max_buffer);
#endif

	mutex_unlock(&trace_types_lock);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Zhao Lei
100
64.10%
1
16.67%
Steven Rostedt
47
30.13%
3
50.00%
David Sharp
5
3.21%
1
16.67%
Alexander Z Lam
4
2.56%
1
16.67%
Total
156
100.00%
6
100.00%



static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
				   size_t cnt, loff_t *fpos)
{
	struct seq_file *m = filp->private_data;
	struct trace_array *tr = m->private;
	char buf[64];
	const char *clockstr;
	int ret;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	clockstr = strstrip(buf);

	ret = tracing_set_clock(tr, clockstr);
	if (ret)
		return ret;

	*fpos += cnt;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
113
92.62%
1
50.00%
Zhao Lei
9
7.38%
1
50.00%
Total
122
100.00%
2
100.00%



static int tracing_clock_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr))
		return -ENODEV;

	ret = single_open(file, tracing_clock_show, inode->i_private);
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
41
55.41%
2
66.67%
Li Zefan
33
44.59%
1
33.33%
Total
74
100.00%
3
100.00%


struct ftrace_buffer_info {
	
struct trace_iterator	iter;
	
void			*spare;
	
unsigned int		read;
};

#ifdef CONFIG_TRACER_SNAPSHOT


static int tracing_snapshot_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	struct seq_file *m;
	int ret = 0;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	if (file->f_mode & FMODE_READ) {
		iter = __tracing_open(inode, file, true);
		if (IS_ERR(iter))
			ret = PTR_ERR(iter);
	} else {
		/* Writes still need the seq_file to hold the private data */
		ret = -ENOMEM;
		m = kzalloc(sizeof(*m), GFP_KERNEL);
		if (!m)
			goto out;
		iter = kzalloc(sizeof(*iter), GFP_KERNEL);
		if (!iter) {
			kfree(m);
			goto out;
		}
		ret = 0;

		iter->tr = tr;
		iter->trace_buffer = &tr->max_buffer;
		iter->cpu_file = tracing_get_cpu(inode);
		m->private = iter;
		file->private_data = m;
	}
out:
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
115
56.93%
4
57.14%
Hiraku Toyooka
64
31.68%
1
14.29%
Alexander Z Lam
17
8.42%
1
14.29%
Oleg Nesterov
6
2.97%
1
14.29%
Total
202
100.00%
7
100.00%


static ssize_t

tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt,
		       loff_t *ppos)
{
	struct seq_file *m = filp->private_data;
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;
	unsigned long val;
	int ret;

	ret = tracing_update_buffers();
	if (ret < 0)
		return ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	mutex_lock(&trace_types_lock);

	if (tr->current_trace->use_max_tr) {
		ret = -EBUSY;
		goto out;
	}

	switch (val) {
	case 0:
		if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
			ret = -EINVAL;
			break;
		}
		if (tr->allocated_snapshot)
			free_snapshot(tr);
		break;
	case 1:
/* Only allow per-cpu swap if the ring buffer supports it */
#ifndef CONFIG_RING_BUFFER_ALLOW_SWAP
		if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
			ret = -EINVAL;
			break;
		}
#endif
		if (!tr->allocated_snapshot) {
			ret = alloc_snapshot(tr);
			if (ret < 0)
				break;
		}
		local_irq_disable();
		/* Now, we're going to swap */
		if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
			update_max_tr(tr, current, smp_processor_id());
		else
			update_max_tr_single(tr, current, iter->cpu_file);
		local_irq_enable();
		break;
	default:
		if (tr->allocated_snapshot) {
			if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
				tracing_reset_online_cpus(&tr->max_buffer);
			else
				tracing_reset(&tr->max_buffer, iter->cpu_file);
		}
		break;
	}

	if (ret >= 0) {
		*ppos += cnt;
		ret = cnt;
	}
out:
	mutex_unlock(&trace_types_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hiraku Toyooka
183
59.61%
1
16.67%
Steven Rostedt
124
40.39%
5
83.33%
Total
307
100.00%
6
100.00%



static int tracing_snapshot_release(struct inode *inode, struct file *file)
{
	struct seq_file *m = file->private_data;
	int ret;

	ret = tracing_release(inode, file);

	if (file->f_mode & FMODE_READ)
		return ret;

	/* If write only, the seq_file is just a stub */
	if (m)
		kfree(m->private);
	kfree(m);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
68
100.00%
2
100.00%
Total
68
100.00%
2
100.00%

static int tracing_buffers_open(struct inode *inode, struct file *filp);
static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf,
				    size_t count, loff_t *ppos);
static int tracing_buffers_release(struct inode *inode, struct file *file);
static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos,
		   struct pipe_inode_info *pipe, size_t len, unsigned int flags);



static int snapshot_raw_open(struct inode *inode, struct file *filp)
{
	struct ftrace_buffer_info *info;
	int ret;

	ret = tracing_buffers_open(inode, filp);
	if (ret < 0)
		return ret;

	info = filp->private_data;

	if (info->iter.trace->use_max_tr) {
		tracing_buffers_release(inode, filp);
		return -EBUSY;
	}

	info->iter.snapshot = true;
	info->iter.trace_buffer = &info->iter.tr->max_buffer;

	return ret;
}

Contributors
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Tokens
Prop
Commits
CommitProp
Steven Rostedt
97
100.00%
1
100.00%
Total
97
100.00%
1
100.00%

#endif /* CONFIG_TRACER_SNAPSHOT */



static const struct file_operations tracing_thresh_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_thresh_read,
	.write		= tracing_thresh_write,
	.llseek		= generic_file_llseek,
};

#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)

static const struct file_operations tracing_max_lat_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_max_lat_read,
	.write		= tracing_max_lat_write,
	.llseek		= generic_file_llseek,
};
#endif


static const struct file_operations set_tracer_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_set_trace_read,
	.write		= tracing_set_trace_write,
	.llseek		= generic_file_llseek,
};


static const struct file_operations tracing_pipe_fops = {
	.open		= tracing_open_pipe,
	.poll		= tracing_poll_pipe,
	.read		= tracing_read_pipe,
	.splice_read	= tracing_splice_read_pipe,
	.release	= tracing_release_pipe,
	.llseek		= no_llseek,
};


static const struct file_operations tracing_entries_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_entries_read,
	.write		= tracing_entries_write,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations tracing_total_entries_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_total_entries_read,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations tracing_free_buffer_fops = {
	.open		= tracing_open_generic_tr,
	.write		= tracing_free_buffer_write,
	.release	= tracing_free_buffer_release,
};


static const struct file_operations tracing_mark_fops = {
	.open		= tracing_open_generic_tr,
	.write		= tracing_mark_write,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations tracing_mark_raw_fops = {
	.open		= tracing_open_generic_tr,
	.write		= tracing_mark_raw_write,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations trace_clock_fops = {
	.open		= tracing_clock_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= tracing_single_release_tr,
	.write		= tracing_clock_write,
};

#ifdef CONFIG_TRACER_SNAPSHOT

static const struct file_operations snapshot_fops = {
	.open		= tracing_snapshot_open,
	.read		= seq_read,
	.write		= tracing_snapshot_write,
	.llseek		= tracing_lseek,
	.release	= tracing_snapshot_release,
};


static const struct file_operations snapshot_raw_fops = {
	.open		= snapshot_raw_open,
	.read		= tracing_buffers_read,
	.release	= tracing_buffers_release,
	.splice_read	= tracing_buffers_splice_read,
	.llseek		= no_llseek,
};

#endif /* CONFIG_TRACER_SNAPSHOT */



static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;
	struct ftrace_buffer_info *info;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		trace_array_put(tr);
		return -ENOMEM;
	}

	mutex_lock(&trace_types_lock);

	info->iter.tr		= tr;
	info->iter.cpu_file	= tracing_get_cpu(inode);
	info->iter.trace	= tr->current_trace;
	info->iter.trace_buffer = &tr->trace_buffer;
	info->spare		= NULL;
	/* Force reading ring buffer for first read */
	info->read		= (unsigned int)-1;

	filp->private_data = info;

	tr->current_trace->ref++;

	mutex_unlock(&trace_types_lock);

	ret = nonseekable_open(inode, filp);
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
176
93.12%
9
75.00%
Lai Jiangshan
7
3.70%
2
16.67%
Oleg Nesterov
6
3.17%
1
8.33%
Total
189
100.00%
12
100.00%


static unsigned int

tracing_buffers_poll(struct file *filp, poll_table *poll_table)
{
	struct ftrace_buffer_info *info = filp->private_data;
	struct trace_iterator *iter = &info->iter;

	return trace_poll(iter, filp, poll_table);
}

Contributors
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Tokens
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CommitProp
Steven Rostedt
45
100.00%
2
100.00%
Total
45
100.00%
2
100.00%


static ssize_t

tracing_buffers_read(struct file *filp, char __user *ubuf,
		     size_t count, loff_t *ppos)
{
	struct ftrace_buffer_info *info = filp->private_data;
	struct trace_iterator *iter = &info->iter;
	ssize_t ret;
	ssize_t size;

	if (!count)
		return 0;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->tr->current_trace->use_max_tr)
		return -EBUSY;
#endif

	if (!info->spare)
		info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer,
							  iter->cpu_file);
	if (!info->spare)
		return -ENOMEM;

	/* Do we have previous read data to read? */
	if (info->read < PAGE_SIZE)
		goto read;

 again:
	trace_access_lock(iter->cpu_file);
	ret = ring_buffer_read_page(iter->trace_buffer->buffer,
				    &info->spare,
				    count,
				    iter->cpu_file, 0);
	trace_access_unlock(iter->cpu_file);

	if (ret < 0) {
		if (trace_empty(iter)) {
			if ((filp->f_flags & O_NONBLOCK))
				return -EAGAIN;

			ret = wait_on_pipe(iter, false);
			if (ret)
				return ret;

			goto again;
		}
		return 0;
	}

	info->read = 0;
 read:
	size = PAGE_SIZE - info->read;
	if (size > count)
		size = count;

	ret = copy_to_user(ubuf, info->spare + info->read, size);
	if (ret == size)
		return -EFAULT;

	size -= ret;

	*ppos += size;
	info->read += size;

	return size;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
251
86.55%
11
73.33%
Lai Jiangshan
35
12.07%
2
13.33%
Rabin Vincent
2
0.69%
1
6.67%
Vaibhav Nagarnaik
2
0.69%
1
6.67%
Total
290
100.00%
15
100.00%



static int tracing_buffers_release(struct inode *inode, struct file *file)
{
	struct ftrace_buffer_info *info = file->private_data;
	struct trace_iterator *iter = &info->iter;

	mutex_lock(&trace_types_lock);

	iter->tr->current_trace->ref--;

	__trace_array_put(iter->tr);

	if (info->spare)
		ring_buffer_free_read_page(iter->trace_buffer->buffer, info->spare);
	kfree(info);

	mutex_unlock(&trace_types_lock);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
84
93.33%
6
85.71%
Lai Jiangshan
6
6.67%
1
14.29%
Total
90
100.00%
7
100.00%


struct buffer_ref {
	
struct ring_buffer	*buffer;
	
void			*page;
	
int			ref;
};



static void buffer_pipe_buf_release(struct pipe_inode_info *pipe,
				    struct pipe_buffer *buf)
{
	struct buffer_ref *ref = (struct buffer_ref *)buf->private;

	if (--ref->ref)
		return;

	ring_buffer_free_read_page(ref->buffer, ref->page);
	kfree(ref);
	buf->private = 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
Steven Rostedt
60
100.00%
1
100.00%
Total
60
100.00%
1
100.00%



static void buffer_pipe_buf_get(struct pipe_inode_info *pipe,
				struct pipe_buffer *buf)
{
	struct buffer_ref *ref = (struct buffer_ref *)buf->private;

	ref->ref++;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%

/* Pipe buffer operations for a buffer. */

static const struct pipe_buf_operations buffer_pipe_buf_ops = {
	.can_merge		= 0,
	.confirm		= generic_pipe_buf_confirm,
	.release		= buffer_pipe_buf_release,
	.steal			= generic_pipe_buf_steal,
	.get			= buffer_pipe_buf_get,
};

/*
 * Callback from splice_to_pipe(), if we need to release some pages
 * at the end of the spd in case we error'ed out in filling the pipe.
 */


static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i)
{
	struct buffer_ref *ref =
		(struct buffer_ref *)spd->partial[i].private;

	if (--ref->ref)
		return;

	ring_buffer_free_read_page(ref->buffer, ref->page);
	kfree(ref);
	spd->partial[i].private = 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
69
100.00%
1
100.00%
Total
69
100.00%
1
100.00%


static ssize_t

tracing_buffers_splice_read(struct file *file, loff_t *ppos,
			    struct pipe_inode_info *pipe, size_t len,
			    unsigned int flags)
{
	struct ftrace_buffer_info *info = file->private_data;
	struct trace_iterator *iter = &info->iter;
	struct partial_page partial_def[PIPE_DEF_BUFFERS];
	struct page *pages_def[PIPE_DEF_BUFFERS];
	struct splice_pipe_desc spd = {
		.pages		= pages_def,
		.partial	= partial_def,
		.nr_pages_max	= PIPE_DEF_BUFFERS,
		.flags		= flags,
		.ops		= &buffer_pipe_buf_ops,
		.spd_release	= buffer_spd_release,
        };
	struct buffer_ref *ref;
	int entries, size, i;
	ssize_t ret = 0;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->tr->current_trace->use_max_tr)
		return -EBUSY;
#endif

	if (*ppos & (PAGE_SIZE - 1))
		return -EINVAL;

	if (len & (PAGE_SIZE - 1)) {
		if (len < PAGE_SIZE)
			return -EINVAL;
		len &= PAGE_MASK;
	}

	if (splice_grow_spd(pipe, &spd))
		return -ENOMEM;

 again:
	trace_access_lock(iter->cpu_file);
	entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);

	for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) {
		struct page *page;
		int r;

		ref = kzalloc(sizeof(*ref), GFP_KERNEL);
		if (!ref) {
			ret = -ENOMEM;
			break;
		}

		ref->ref = 1;
		ref->buffer = iter->trace_buffer->buffer;
		ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file);
		if (!ref->page) {
			ret = -ENOMEM;
			kfree(ref);
			break;
		}

		r = ring_buffer_read_page(ref->buffer, &ref->page,
					  len, iter->cpu_file, 1);
		if (r < 0) {
			ring_buffer_free_read_page(ref->buffer, ref->page);
			kfree(ref);
			break;
		}

		/*
                 * zero out any left over data, this is going to
                 * user land.
                 */
		size = ring_buffer_page_len(ref->page);
		if (size < PAGE_SIZE)
			memset(ref->page + size, 0, PAGE_SIZE - size);

		page = virt_to_page(ref->page);

		spd.pages[i] = page;
		spd.partial[i].len = PAGE_SIZE;
		spd.partial[i].offset = 0;
		spd.partial[i].private = (unsigned long)ref;
		spd.nr_pages++;
		*ppos += PAGE_SIZE;

		entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
	}

	trace_access_unlock(iter->cpu_file);
	spd.nr_pages = i;

	/* did we read anything? */
	if (!spd.nr_pages) {
		if (ret)
			goto out;

		ret = -EAGAIN;
		if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK))
			goto out;

		ret = wait_on_pipe(iter, true);
		if (ret)
			goto out;

		goto again;
	}

	ret = splice_to_pipe(pipe, &spd);
out:
	splice_shrink_spd(&spd);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
455
78.58%
11
52.38%
Lai Jiangshan
53
9.15%
3
14.29%
Al Viro
32
5.53%
2
9.52%
Rabin Vincent
20
3.45%
2
9.52%
Jens Axboe
12
2.07%
1
4.76%
Eric Dumazet
5
0.86%
1
4.76%
Vaibhav Nagarnaik
2
0.35%
1
4.76%
Total
579
100.00%
21
100.00%


static const struct file_operations tracing_buffers_fops = {
	.open		= tracing_buffers_open,
	.read		= tracing_buffers_read,
	.poll		= tracing_buffers_poll,
	.release	= tracing_buffers_release,
	.splice_read	= tracing_buffers_splice_read,
	.llseek		= no_llseek,
};


static ssize_t

tracing_stats_read(struct file *filp, char __user *ubuf,
		   size_t count, loff_t *ppos)
{
	struct inode *inode = file_inode(filp);
	struct trace_array *tr = inode->i_private;
	struct trace_buffer *trace_buf = &tr->trace_buffer;
	int cpu = tracing_get_cpu(inode);
	struct trace_seq *s;
	unsigned long cnt;
	unsigned long long t;
	unsigned long usec_rem;

	s = kmalloc(sizeof(*s), GFP_KERNEL);
	if (!s)
		return -ENOMEM;

	trace_seq_init(s);

	cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "entries: %ld\n", cnt);

	cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "overrun: %ld\n", cnt);

	cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "commit overrun: %ld\n", cnt);

	cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "bytes: %ld\n", cnt);

	if (trace_clocks[tr->clock_id].in_ns) {
		/* local or global for trace_clock */
		t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu));
		usec_rem = do_div(t, USEC_PER_SEC);
		trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n",
								t, usec_rem);

		t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu));
		usec_rem = do_div(t, USEC_PER_SEC);
		trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
	} else {
		/* counter or tsc mode for trace_clock */
		trace_seq_printf(s, "oldest event ts: %llu\n",
				ring_buffer_oldest_event_ts(trace_buf->buffer, cpu));

		trace_seq_printf(s, "now ts: %llu\n",
				ring_buffer_time_stamp(trace_buf->buffer, cpu));
	}

	cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "dropped events: %ld\n", cnt);

	cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "read events: %ld\n", cnt);

	count = simple_read_from_buffer(ubuf, count, ppos,
					s->buffer, trace_seq_used(s));

	kfree(s);

	return count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
193
52.02%
6
46.15%
Vaibhav Nagarnaik
94
25.34%
1
7.69%
Yoshihiro Yunomae
48
12.94%
2
15.38%
Slava Pestov
19
5.12%
1
7.69%
Oleg Nesterov
15
4.04%
1
7.69%
Roel Kluin
1
0.27%
1
7.69%
Li Zefan
1
0.27%
1
7.69%
Total
371
100.00%
13
100.00%


static const struct file_operations tracing_stats_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_stats_read,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};

#ifdef CONFIG_DYNAMIC_FTRACE



int __weak ftrace_arch_read_dyn_info(char *buf, int size)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
13
81.25%
1
33.33%
Jens Axboe
2
12.50%
1
33.33%
Lai Jiangshan
1
6.25%
1
33.33%
Total
16
100.00%
3
100.00%


static ssize_t

tracing_read_dyn_info(struct file *filp, char __user *ubuf,
		  size_t cnt, loff_t *ppos)
{
	static char ftrace_dyn_info_buffer[1024];
	static DEFINE_MUTEX(dyn_info_mutex);
	unsigned long *p = filp->private_data;
	char *buf = ftrace_dyn_info_buffer;
	int size = ARRAY_SIZE(ftrace_dyn_info_buffer);
	int r;

	mutex_lock(&dyn_info_mutex);
	r = sprintf(buf, "%ld ", *p);

	r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r);
	buf[r++] = '\n';

	r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);

	mutex_unlock(&dyn_info_mutex);

	return r;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
126
97.67%
6
75.00%
Jens Axboe
2
1.55%
1
12.50%
Vaibhav Nagarnaik
1
0.78%
1
12.50%
Total
129
100.00%
8
100.00%


static const struct file_operations tracing_dyn_info_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_read_dyn_info,
	.llseek		= generic_file_llseek,
};
#endif /* CONFIG_DYNAMIC_FTRACE */

#if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE)

static void

ftrace_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
{
	tracing_snapshot();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
22
100.00%
2
100.00%
Total
22
100.00%
2
100.00%


static void

ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
{
	unsigned long *count = (long *)data;

	if (!*count)
		return;

	if (*count != -1)
		(*count)--;

	tracing_snapshot();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
54
100.00%
2
100.00%
Total
54
100.00%
2
100.00%


static int

ftrace_snapshot_print(struct seq_file *m, unsigned long ip,
		      struct ftrace_probe_ops *ops, void *data)
{
	long count = (long)data;

	seq_printf(m, "%ps:", (void *)ip);

	seq_puts(m, "snapshot");

	if (count == -1)
		seq_puts(m, ":unlimited\n");
	else
		seq_printf(m, ":count=%ld\n", count);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
77
97.47%
2
66.67%
Rasmus Villemoes
2
2.53%
1
33.33%
Total
79
100.00%
3
100.00%


static struct ftrace_probe_ops snapshot_probe_ops = {
	.func			= ftrace_snapshot,
	.print			= ftrace_snapshot_print,
};


static struct ftrace_probe_ops snapshot_count_probe_ops = {
	.func			= ftrace_count_snapshot,
	.print			= ftrace_snapshot_print,
};


static int

ftrace_trace_snapshot_callback(struct ftrace_hash *hash,
			       char *glob, char *cmd, char *param, int enable)
{
	struct ftrace_probe_ops *ops;
	void *count = (void *)-1;
	char *number;
	int ret;

	/* hash funcs only work with set_ftrace_filter */
	if (!enable)
		return -EINVAL;

	ops = param ? &snapshot_count_probe_ops :  &snapshot_probe_ops;

	if (glob[0] == '!') {
		unregister_ftrace_function_probe_func(glob+1, ops);
		return 0;
	}

	if (!param)
		goto out_reg;

	number = strsep(&param, ":");

	if (!strlen(number))
		goto out_reg;

	/*
         * We use the callback data field (which is a pointer)
         * as our counter.
         */
	ret = kstrtoul(number, 0, (unsigned long *)&count);
	if (ret)
		return ret;

 out_reg:
	ret = alloc_snapshot(&global_trace);
	if (ret < 0)
		goto out;

	ret = register_ftrace_function_probe(glob, ops, count);

 out:
	return ret < 0 ? ret : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
183
97.86%
3
60.00%
Jens Axboe
3
1.60%
1
20.00%
Lai Jiangshan
1
0.53%
1
20.00%
Total
187
100.00%
5
100.00%


static struct ftrace_func_command ftrace_snapshot_cmd = {
	.name			= "snapshot",
	.func			= ftrace_trace_snapshot_callback,
};



static __init int register_snapshot_cmd(void)
{
	return register_ftrace_command(&ftrace_snapshot_cmd);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
15
93.75%
2
66.67%
Tom Zanussi
1
6.25%
1
33.33%
Total
16
100.00%
3
100.00%

#else


static inline __init int register_snapshot_cmd(void) { return 0; }
Contributors
Person
Tokens
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Commits
CommitProp
Steven Rostedt
12
92.31%
2
66.67%
Tom Zanussi
1
7.69%
1
33.33%
Total
13
100.00%
3
100.00%

#endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */



static struct dentry *tracing_get_dentry(struct trace_array *tr)
{
	if (WARN_ON(!tr->dir))
		return ERR_PTR(-ENODEV);

	/* Top directory uses NULL as the parent */
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
		return NULL;

	/* All sub buffers have a descriptor */
	return tr->dir;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
48
100.00%
7
100.00%
Total
48
100.00%
7
100.00%



static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu)
{
	struct dentry *d_tracer;

	if (tr->percpu_dir)
		return tr->percpu_dir;

	d_tracer = tracing_get_dentry(tr);
	if (IS_ERR(d_tracer))
		return NULL;

	tr->percpu_dir = tracefs_create_dir("per_cpu", d_tracer);

	WARN_ONCE(!tr->percpu_dir,
		  "Could not create tracefs directory 'per_cpu/%d'\n", cpu);

	return tr->percpu_dir;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
51
66.23%
5
62.50%
Frédéric Weisbecker
24
31.17%
1
12.50%
Josh Triplett
1
1.30%
1
12.50%
Vaibhav Nagarnaik
1
1.30%
1
12.50%
Total
77
100.00%
8
100.00%


static struct dentry *

trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent,
		      void *data, long cpu, const struct file_operations *fops)
{
	struct dentry *ret = trace_create_file(name, mode, parent, data, fops);

	if (ret) /* See tracing_get_cpu() */
		d_inode(ret)->i_cdev = (void *)(cpu + 1);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
73
94.81%
1
33.33%
David Howells
3
3.90%
1
33.33%
Frédéric Weisbecker
1
1.30%
1
33.33%
Total
77
100.00%
3
100.00%


static void

tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
{
	struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu);
	struct dentry *d_cpu;
	char cpu_dir[30]; /* 30 characters should be more than enough */

	if (!d_percpu)
		return;

	snprintf(cpu_dir, 30, "cpu%ld", cpu);
	d_cpu = tracefs_create_dir(cpu_dir, d_percpu);
	if (!d_cpu) {
		pr_warn("Could not create tracefs '%s' entry\n", cpu_dir);
		return;
	}

	/* per cpu trace_pipe */
	trace_create_cpu_file("trace_pipe", 0444, d_cpu,
				tr, cpu, &tracing_pipe_fops);

	/* per cpu trace */
	trace_create_cpu_file("trace", 0644, d_cpu,
				tr, cpu, &tracing_fops);

	trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu,
				tr, cpu, &tracing_buffers_fops);

	trace_create_cpu_file("stats", 0444, d_cpu,
				tr, cpu, &tracing_stats_fops);

	trace_create_cpu_file("buffer_size_kb", 0444, d_cpu,
				tr, cpu, &tracing_entries_fops);

#ifdef CONFIG_TRACER_SNAPSHOT
	trace_create_cpu_file("snapshot", 0644, d_cpu,
				tr, cpu, &snapshot_fops);

	trace_create_cpu_file("snapshot_raw", 0444, d_cpu,
				tr, cpu, &snapshot_raw_fops);
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
64
32.32%
8
38.10%
Frédéric Weisbecker
55
27.78%
2
9.52%
Vaibhav Nagarnaik
42
21.21%
2
9.52%
Oleg Nesterov
29
14.65%
6
28.57%
Namhyung Kim
6
3.03%
1
4.76%
Joe Perches
1
0.51%
1
4.76%
Yoshihiro Yunomae
1
0.51%
1
4.76%
Total
198
100.00%
21
100.00%

#ifdef CONFIG_FTRACE_SELFTEST
/* Let selftest have access to static functions in this file */
#include "trace_selftest.c"
#endif


static ssize_t

trace_options_read(struct file *filp, char __user *ubuf, size_t cnt,
			loff_t *ppos)
{
	struct trace_option_dentry *topt = filp->private_data;
	char *buf;

	if (topt->flags->val & topt->opt->bit)
		buf = "1\n";
	else
		buf = "0\n";

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
70
95.89%
2
66.67%
Yoshihiro Yunomae
3
4.11%
1
33.33%
Total
73
100.00%
3
100.00%


static ssize_t

trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
			 loff_t *ppos)
{
	struct trace_option_dentry *topt = filp->private_data;
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	if (val != 0 && val != 1)
		return -EINVAL;

	if (!!(topt->flags->val & topt->opt->bit) != val) {
		mutex_lock(&trace_types_lock);
		ret = __set_tracer_option(topt->tr, topt->flags,
					  topt->opt, !val);
		mutex_unlock(&trace_types_lock);
		if (ret)
			return ret;
	}

	*ppos += cnt;

	return cnt;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
114
79.17%
6
60.00%
Li Zefan
16
11.11%
1
10.00%
Yoshihiro Yunomae
7
4.86%
1
10.00%
Slava Pestov
4
2.78%
1
10.00%
Peter Hüwe
3
2.08%
1
10.00%
Total
144
100.00%
10
100.00%


static const struct file_operations trace_options_fops = {
	.open = tracing_open_generic,
	.read = trace_options_read,
	.write = trace_options_write,
	.llseek	= generic_file_llseek,
};

/*
 * In order to pass in both the trace_array descriptor as well as the index
 * to the flag that the trace option file represents, the trace_array
 * has a character array of trace_flags_index[], which holds the index
 * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc.
 * The address of this character array is passed to the flag option file
 * read/write callbacks.
 *
 * In order to extract both the index and the trace_array descriptor,
 * get_tr_index() uses the following algorithm.
 *
 *   idx = *ptr;
 *
 * As the pointer itself contains the address of the index (remember
 * index[1] == 1).
 *
 * Then to get the trace_array descriptor, by subtracting that index
 * from the ptr, we get to the start of the index itself.
 *
 *   ptr - idx == &index[0]
 *
 * Then a simple container_of() from that pointer gets us to the
 * trace_array descriptor.
 */


static void get_tr_index(void *data, struct trace_array **ptr,
			 unsigned int *pindex)
{
	*pindex = *(unsigned char *)data;

	*ptr = container_of(data - *pindex, struct trace_array,
			    trace_flags_index);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
48
100.00%
1
100.00%
Total
48
100.00%
1
100.00%


static ssize_t

trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
			loff_t *ppos)
{
	void *tr_index = filp->private_data;
	struct trace_array *tr;
	unsigned int index;
	char *buf;

	get_tr_index(tr_index, &tr, &index);

	if (tr->trace_flags & (1 << index))
		buf = "1\n";
	else
		buf = "0\n";

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
90
100.00%
4
100.00%
Total
90
100.00%
4
100.00%


static ssize_t

trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
			 loff_t *ppos)
{
	void *tr_index = filp->private_data;
	struct trace_array *tr;
	unsigned int index;
	unsigned long val;
	int ret;

	get_tr_index(tr_index, &tr, &index);

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	if (val != 0 && val != 1)
		return -EINVAL;

	mutex_lock(&trace_types_lock);
	ret = set_tracer_flag(tr, 1 << index, val);
	mutex_unlock(&trace_types_lock);

	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
124
91.18%
9
81.82%
Zhao Lei
10
7.35%
1
9.09%
Peter Hüwe
2
1.47%
1
9.09%
Total
136
100.00%
11
100.00%


static const struct file_operations trace_options_core_fops = {
	.open = tracing_open_generic,
	.read = trace_options_core_read,
	.write = trace_options_core_write,
	.llseek = generic_file_llseek,
};



struct dentry *trace_create_file(const char *name,
				 umode_t mode,
				 struct dentry *parent,
				 void *data,
				 const struct file_operations *fops)
{
	struct dentry *ret;

	ret = tracefs_create_file(name, mode, parent, data, fops);
	if (!ret)
		pr_warn("Could not create tracefs '%s' entry\n", name);

	return ret;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Frédéric Weisbecker
36
55.38%
1
16.67%
Steven Rostedt
27
41.54%
3
50.00%
Joe Perches
1
1.54%
1
16.67%
Al Viro
1
1.54%
1
16.67%
Total
65
100.00%
6
100.00%



static struct dentry *trace_options_init_dentry(struct trace_array *tr)
{
	struct dentry *d_tracer;

	if (tr->options)
		return tr->options;

	d_tracer = tracing_get_dentry(tr);
	if (IS_ERR(d_tracer))
		return NULL;

	tr->options = tracefs_create_dir("options", d_tracer);
	if (!tr->options) {
		pr_warn("Could not create tracefs directory 'options'\n");
		return NULL;
	}

	return tr->options;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Frédéric Weisbecker
47
59.49%
1
11.11%
Steven Rostedt
30
37.97%
6
66.67%
Josh Triplett
1
1.27%
1
11.11%
Joe Perches
1
1.27%
1
11.11%
Total
79
100.00%
9
100.00%


static void

create_trace_option_file(struct trace_array *tr,
			 struct trace_option_dentry *topt,
			 struct tracer_flags *flags,
			 struct tracer_opt *opt)
{
	struct dentry *t_options;

	t_options = trace_options_init_dentry(tr);
	if (!t_options)
		return;

	topt->flags = flags;
	topt->opt = opt;
	topt->tr = tr;

	topt->entry = trace_create_file(opt->name, 0644, t_options, topt,
				    &trace_options_fops);

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
52
63.41%
3
50.00%
Frédéric Weisbecker
30
36.59%
3
50.00%
Total
82
100.00%
6
100.00%


static void

create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
{
	struct trace_option_dentry *topts;
	struct trace_options *tr_topts;
	struct tracer_flags *flags;
	struct tracer_opt *opts;
	int cnt;
	int i;

	if (!tracer)
		return;

	flags = tracer->flags;

	if (!flags || !flags->opts)
		return;

	/*
         * If this is an instance, only create flags for tracers
         * the instance may have.
         */
	if (!trace_ok_for_array(tracer, tr))
		return;

	for (i = 0; i < tr->nr_topts; i++) {
		/* Make sure there's no duplicate flags. */
		if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags))
			return;
	}

	opts = flags->opts;

	for (cnt = 0; opts[cnt].name; cnt++)
		;

	topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL);
	if (!topts)
		return;

	tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1),
			    GFP_KERNEL);
	if (!tr_topts) {
		kfree(topts);
		return;
	}

	tr->topts = tr_topts;
	tr->topts[tr->nr_topts].tracer = tracer;
	tr->topts[tr->nr_topts].topts = topts;
	tr->nr_topts++;

	for (cnt = 0; opts[cnt].name; cnt++) {
		create_trace_option_file(tr, &topts[cnt], flags,
					 &opts[cnt]);
		WARN_ONCE(topts[cnt].entry == NULL,
			  "Failed to create trace option: %s",
			  opts[cnt].name);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
286
96.30%
7
77.78%
Vaibhav Nagarnaik
7
2.36%
1
11.11%
Chunyu Hu
4
1.35%
1
11.11%
Total
297
100.00%
9
100.00%


static struct dentry *

create_trace_option_core_file(struct trace_array *tr,
			      const char *option, long index)
{
	struct dentry *t_options;

	t_options = trace_options_init_dentry(tr);
	if (!t_options)
		return NULL;

	return trace_create_file(option, 0644, t_options,
				 (void *)&tr->trace_flags_index[index],
				 &trace_options_core_fops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
64
96.97%
4
80.00%
Frédéric Weisbecker
2
3.03%
1
20.00%
Total
66
100.00%
5
100.00%



static void create_trace_options_dir(struct trace_array *tr)
{
	struct dentry *t_options;
	bool top_level = tr == &global_trace;
	int i;

	t_options = trace_options_init_dentry(tr);
	if (!t_options)
		return;

	for (i = 0; trace_options[i]; i++) {
		if (top_level ||
		    !((1 << i) & TOP_LEVEL_TRACE_FLAGS))
			create_trace_option_core_file(tr, trace_options[i], i);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
81
97.59%
4
66.67%
Peter Hüwe
1
1.20%
1
16.67%
Li Zefan
1
1.20%
1
16.67%
Total
83
100.00%
6
100.00%


static ssize_t

rb_simple_read(struct file *filp, char __user *ubuf,
	       size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[64];
	int r;

	r = tracer_tracing_is_on(tr);
	r = sprintf(buf, "%d\n", r);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
73
100.00%
5
100.00%
Total
73
100.00%
5
100.00%


static ssize_t

rb_simple_write(struct file *filp, const char __user *ubuf,
		size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	struct ring_buffer *buffer = tr->trace_buffer.buffer;
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	if (buffer) {
		mutex_lock(&trace_types_lock);
		if (val) {
			tracer_tracing_on(tr);
			if (tr->current_trace->start)
				tr->current_trace->start(tr);
		} else {
			tracer_tracing_off(tr);
			if (tr->current_trace->stop)
				tr->current_trace->stop(tr);
		}
		mutex_unlock(&trace_types_lock);
	}

	(*ppos)++;

	return cnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
144
94.74%
9
81.82%
Zhao Lei
5
3.29%
1
9.09%
Peter Hüwe
3
1.97%
1
9.09%
Total
152
100.00%
11
100.00%


static const struct file_operations rb_simple_fops = {
	.open		= tracing_open_generic_tr,
	.read		= rb_simple_read,
	.write		= rb_simple_write,
	.release	= tracing_release_generic_tr,
	.llseek		= default_llseek,
};


struct dentry *trace_instance_dir;

static void
init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer);


static int

allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size)
{
	enum ring_buffer_flags rb_flags;

	rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;

	buf->tr = tr;

	buf->buffer = ring_buffer_alloc(size, rb_flags);
	if (!buf->buffer)
		return -ENOMEM;

	buf->data = alloc_percpu(struct trace_array_cpu);
	if (!buf->data) {
		ring_buffer_free(buf->buffer);
		return -ENOMEM;
	}

	/* Allocate the first page for all buffers */
	set_buffer_entries(&tr->trace_buffer,
			   ring_buffer_size(tr->trace_buffer.buffer, 0));

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
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Steven Rostedt
99
85.34%
6
85.71%
Frédéric Weisbecker
17
14.66%
1
14.29%
Total
116
100.00%
7
100.00%



static int allocate_trace_buffers(struct trace_array *tr, int size)
{
	int ret;

	ret = allocate_trace_buffer(tr, &tr->trace_buffer, size);
	if (ret)
		return ret;

#ifdef CONFIG_TRACER_MAX_TRACE
	ret = allocate_trace_buffer(tr, &tr->max_buffer,
				    allocate_snapshot ? size : 1);
	if (WARN_ON(ret)) {
		ring_buffer_free(tr->trace_buffer.buffer);
		free_percpu(tr->trace_buffer.data);
		return -ENOMEM;
	}
	tr->allocated_snapshot = allocate_snapshot;

	/*
         * Only the top level trace array gets its snapshot allocated
         * from the kernel command line.
         */
	allocate_snapshot = false;
#endif
	return 0;
}

Contributors
Person
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CommitProp
Steven Rostedt
106
100.00%
6
100.00%
Total
106
100.00%
6
100.00%



static void free_trace_buffer(struct trace_buffer *buf)
{
	if (buf->buffer) {
		ring_buffer_free(buf->buffer);
		buf->buffer = NULL;
		free_percpu(buf->data);
		buf->data = NULL;
	}
}

Contributors
Person
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Prop
Commits
CommitProp
Steven Rostedt
45
100.00%
2
100.00%
Total
45
100.00%
2
100.00%



static void free_trace_buffers(struct trace_array *tr)
{
	if (!tr)
		return;

	free_trace_buffer(&tr->trace_buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	free_trace_buffer(&tr->max_buffer);
#endif
}

Contributors
Person
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CommitProp
Steven Rostedt
38
100.00%
2
100.00%
Total
38
100.00%
2
100.00%



static void init_trace_flags_index(struct trace_array *tr)
{
	int i;

	/* Used by the trace options files */
	for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++)
		tr->trace_flags_index[i] = i;
}

Contributors
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CommitProp
Steven Rostedt
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%



static void __update_tracer_options(struct trace_array *tr)
{
	struct tracer *t;

	for (t = trace_types; t; t = t->next)
		add_tracer_options(tr, t);
}

Contributors
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Steven Rostedt
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%



static void update_tracer_options(struct trace_array *tr)
{
	mutex_lock(&trace_types_lock);
	__update_tracer_options(tr);
	mutex_unlock(&trace_types_lock);
}

Contributors
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Steven Rostedt
28
100.00%
1
100.00%
Total
28
100.00%
1
100.00%



static int instance_mkdir(const char *name)
{
	struct trace_array *tr;
	int ret;

	mutex_lock(&trace_types_lock);

	ret = -EEXIST;
	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		if (tr->name && strcmp(tr->name, name) == 0)
			goto out_unlock;
	}

	ret = -ENOMEM;
	tr = kzalloc(sizeof(*tr), GFP_KERNEL);
	if (!tr)
		goto out_unlock;

	tr->name = kstrdup(name, GFP_KERNEL);
	if (!tr->name)
		goto out_free_tr;

	if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL))
		goto out_free_tr;

	tr->trace_flags = global_trace.trace_flags & ~ZEROED_TRACE_FLAGS;

	cpumask_copy(tr->tracing_cpumask, cpu_all_mask);

	raw_spin_lock_init(&tr->start_lock);

	tr->max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;

	tr->current_trace = &nop_trace;

	INIT_LIST_HEAD(&tr->systems);
	INIT_LIST_HEAD(&tr->events);

	if (allocate_trace_buffers(tr, trace_buf_size) < 0)
		goto out_free_tr;

	tr->dir = tracefs_create_dir(name, trace_instance_dir);
	if (!tr->dir)
		goto out_free_tr;

	ret = event_trace_add_tracer(tr->dir, tr);
	if (ret) {
		tracefs_remove_recursive(tr->dir);
		goto out_free_tr;
	}

	init_tracer_tracefs(tr, tr->dir);
	init_trace_flags_index(tr);
	__update_tracer_options(tr);

	list_add(&tr->list, &ftrace_trace_arrays);

	mutex_unlock(&trace_types_lock);

	return 0;

 out_free_tr:
	free_trace_buffers(tr);
	free_cpumask_var(tr->tracing_cpumask);
	kfree(tr->name);
	kfree(tr);

 out_unlock:
	mutex_unlock(&trace_types_lock);

	return ret;

}

Contributors
Person
Tokens
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Commits
CommitProp
Steven Rostedt
281
87.54%
13
86.67%
Alexander Z Lam
40
12.46%
2
13.33%
Total
321
100.00%
15
100.00%



static int instance_rmdir(const char *name)
{
	struct trace_array *tr;
	int found = 0;
	int ret;
	int i;

	mutex_lock(&trace_types_lock);

	ret = -ENODEV;
	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		if (tr->name && strcmp(tr->name, name) == 0) {
			found = 1;
			break;
		}
	}
	if (!found)
		goto out_unlock;

	ret = -EBUSY;
	if (tr->ref || (tr->current_trace && tr->current_trace->ref))
		goto out_unlock;

	list_del(&tr->list);

	/* Disable all the flags that were enabled coming in */
	for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) {
		if ((1 << i) & ZEROED_TRACE_FLAGS)
			set_tracer_flag(tr, 1 << i, 0);
	}

	tracing_set_nop(tr);
	event_trace_del_tracer(tr);
	ftrace_clear_pids(tr);
	ftrace_destroy_function_files(tr);
	tracefs_remove_recursive(tr->dir);
	free_trace_buffers(tr);

	for (i = 0; i < tr->nr_topts; i++) {
		kfree(tr->topts[i].topts);
	}
	kfree(tr->topts);

	kfree(tr->name);
	kfree(tr);

	ret = 0;

 out_unlock:
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
240
97.56%
10
83.33%
Namhyung Kim
5
2.03%
1
8.33%
Jiaxing Wang
1
0.41%
1
8.33%
Total
246
100.00%
12
100.00%



static __init void create_trace_instances(struct dentry *d_tracer)
{
	trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer,
							 instance_mkdir,
							 instance_rmdir);
	if (WARN_ON(!trace_instance_dir))
		return;
}

Contributors
Person
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CommitProp
Steven Rostedt
34
100.00%
3
100.00%
Total
34
100.00%
3
100.00%


static void

init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
{
	int cpu;

	trace_create_file("available_tracers", 0444, d_tracer,
			tr, &show_traces_fops);

	trace_create_file("current_tracer", 0644, d_tracer,
			tr, &set_tracer_fops);

	trace_create_file("tracing_cpumask", 0644, d_tracer,
			  tr, &tracing_cpumask_fops);

	trace_create_file("trace_options", 0644, d_tracer,
			  tr, &tracing_iter_fops);

	trace_create_file("trace", 0644, d_tracer,
			  tr, &tracing_fops);

	trace_create_file("trace_pipe", 0444, d_tracer,
			  tr, &tracing_pipe_fops);

	trace_create_file("buffer_size_kb", 0644, d_tracer,
			  tr, &tracing_entries_fops);

	trace_create_file("buffer_total_size_kb", 0444, d_tracer,
			  tr, &tracing_total_entries_fops);

	trace_create_file("free_buffer", 0200, d_tracer,
			  tr, &tracing_free_buffer_fops);

	trace_create_file("trace_marker", 0220, d_tracer,
			  tr, &tracing_mark_fops);

	trace_create_file("trace_marker_raw", 0220, d_tracer,
			  tr, &tracing_mark_raw_fops);

	trace_create_file("trace_clock", 0644, d_tracer, tr,
			  &trace_clock_fops);

	trace_create_file("tracing_on", 0644, d_tracer,
			  tr, &rb_simple_fops);

	create_trace_options_dir(tr);

#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
	trace_create_file("tracing_max_latency", 0644, d_tracer,
			&tr->max_latency, &tracing_max_lat_fops);
#endif

	if (ftrace_create_function_files(tr, d_tracer))
		WARN(1, "Could not allocate function filter files");

#ifdef CONFIG_TRACER_SNAPSHOT
	trace_create_file("snapshot", 0644, d_tracer,
			  tr, &snapshot_fops);
#endif

	for_each_tracing_cpu(cpu)
		tracing_init_tracefs_percpu(tr, cpu);

	ftrace_init_tracefs(tr, d_tracer);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
258
89.27%
17
80.95%
Alexander Z Lam
14
4.84%
1
4.76%
Frédéric Weisbecker
10
3.46%
1
4.76%
Ingo Molnar
6
2.08%
1
4.76%
Wang YanQing
1
0.35%
1
4.76%
Total
289
100.00%
21
100.00%



static struct vfsmount *trace_automount(struct dentry *mntpt, void *ingore)
{
	struct vfsmount *mnt;
	struct file_system_type *type;

	/*
         * To maintain backward compatibility for tools that mount
         * debugfs to get to the tracing facility, tracefs is automatically
         * mounted to the debugfs/tracing directory.
         */
	type = get_fs_type("tracefs");
	if (!type)
		return NULL;
	mnt = vfs_submount(mntpt, type, "tracefs", NULL);
	put_filesystem(type);
	if (IS_ERR(mnt))
		return NULL;
	mntget(mnt);

	return mnt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
71
89.87%
1
50.00%
Eric W. Biedermann
8
10.13%
1
50.00%
Total
79
100.00%
2
100.00%

/**
 * tracing_init_dentry - initialize top level trace array
 *
 * This is called when creating files or directories in the tracing
 * directory. It is called via fs_initcall() by any of the boot up code
 * and expects to return the dentry of the top level tracing directory.
 */


struct dentry *tracing_init_dentry(void)
{
	struct trace_array *tr = &global_trace;

	/* The top level trace array uses  NULL as parent */
	if (tr->dir)
		return NULL;

	if (WARN_ON(!tracefs_initialized()) ||
		(IS_ENABLED(CONFIG_DEBUG_FS) &&
		 WARN_ON(!debugfs_initialized())))
		return ERR_PTR(-ENODEV);

	/*
         * As there may still be users that expect the tracing
         * files to exist in debugfs/tracing, we must automount
         * the tracefs file system there, so older tools still
         * work with the newer kerenl.
         */
	tr->dir = debugfs_create_automount("tracing", NULL,
					   trace_automount, NULL);
	if (!tr->dir) {
		pr_warn_once("Could not create debugfs directory 'tracing'\n");
		return ERR_PTR(-ENOMEM);
	}

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
74
76.29%
1
33.33%
Jiaxing Wang
14
14.43%
1
33.33%
Linus Torvalds
9
9.28%
1
33.33%
Total
97
100.00%
3
100.00%

extern struct trace_enum_map *__start_ftrace_enum_maps[];
extern struct trace_enum_map *__stop_ftrace_enum_maps[];



static void __init trace_enum_init(void)
{
	int len;

	len = __stop_ftrace_enum_maps - __start_ftrace_enum_maps;
	trace_insert_enum_map(NULL, __start_ftrace_enum_maps, len);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
27
100.00%
3
100.00%
Total
27
100.00%
3
100.00%

#ifdef CONFIG_MODULES


static void trace_module_add_enums(struct module *mod)
{
	if (!mod->num_trace_enums)
		return;

	/*
         * Modules with bad taint do not have events created, do
         * not bother with enums either.
         */
	if (trace_module_has_bad_taint(mod))
		return;

	trace_insert_enum_map(mod, mod->trace_enums, mod->num_trace_enums);
}

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Steven Rostedt
41
100.00%
4
100.00%
Total
41
100.00%
4
100.00%

#ifdef CONFIG_TRACE_ENUM_MAP_FILE


static void trace_module_remove_enums(struct module *mod)
{
	union trace_enum_map_item *map;
	union trace_enum_map_item **last = &trace_enum_maps;

	if (!mod->num_trace_enums)
		return;

	mutex_lock(&trace_enum_mutex);

	map = trace_enum_maps;

	while (map) {
		if (map->head.mod == mod)
			break;
		map = trace_enum_jmp_to_tail(map);
		last = &map->tail.next;
		map = map->tail.next;
	}
	if (!map)
		goto out;

	*last = trace_enum_jmp_to_tail(map)->tail.next;
	kfree(map);
 out:
	mutex_unlock(&trace_enum_mutex);
}
Contributors
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Steven Rostedt
117
100.00%
2
100.00%
Total
117
100.00%
2
100.00%

#else


static inline void trace_module_remove_enums(struct module *mod) { }
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Steven Rostedt
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%

#endif /* CONFIG_TRACE_ENUM_MAP_FILE */



static int trace_module_notify(struct notifier_block *self,
			       unsigned long val, void *data)
{
	struct module *mod = data;

	switch (val) {
	case MODULE_STATE_COMING:
		trace_module_add_enums(mod);
		break;
	case MODULE_STATE_GOING:
		trace_module_remove_enums(mod);
		break;
	}

	return 0;
}

Contributors
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Steven Rostedt
53
100.00%
3
100.00%
Total
53
100.00%
3
100.00%


static struct notifier_block trace_module_nb = {
	.notifier_call = trace_module_notify,
	.priority = 0,
};
#endif /* CONFIG_MODULES */



static __init int tracer_init_tracefs(void)
{
	struct dentry *d_tracer;

	trace_access_lock_init();

	d_tracer = tracing_init_dentry();
	if (IS_ERR(d_tracer))
		return 0;

	init_tracer_tracefs(&global_trace, d_tracer);
	ftrace_init_tracefs_toplevel(&global_trace, d_tracer);

	trace_create_file("tracing_thresh", 0644, d_tracer,
			&global_trace, &tracing_thresh_fops);

	trace_create_file("README", 0444, d_tracer,
			NULL, &tracing_readme_fops);

	trace_create_file("saved_cmdlines", 0444, d_tracer,
			NULL, &tracing_saved_cmdlines_fops);

	trace_create_file("saved_cmdlines_size", 0644, d_tracer,
			  NULL, &tracing_saved_cmdlines_size_fops);

	trace_enum_init();

	trace_create_enum_file(d_tracer);

#ifdef CONFIG_MODULES
	register_module_notifier(&trace_module_nb);
#endif

#ifdef CONFIG_DYNAMIC_FTRACE
	trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
			&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
#endif

	create_trace_instances(d_tracer);

	update_tracer_options(&global_trace);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
85
53.80%
12
48.00%
Frédéric Weisbecker
24
15.19%
3
12.00%
Yoshihiro Yunomae
14
8.86%
1
4.00%
Lai Jiangshan
11
6.96%
3
12.00%
Avadh Patel
10
6.33%
1
4.00%
Namhyung Kim
6
3.80%
1
4.00%
Hiraku Toyooka
4
2.53%
1
4.00%
Stanislav Fomichev
2
1.27%
1
4.00%
Li Zefan
1
0.63%
1
4.00%
Ingo Molnar
1
0.63%
1
4.00%
Total
158
100.00%
25
100.00%



static int trace_panic_handler(struct notifier_block *this,
			       unsigned long event, void *unused)
{
	if (ftrace_dump_on_oops)
		ftrace_dump(ftrace_dump_on_oops);
	return NOTIFY_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
28
90.32%
4
80.00%
Frédéric Weisbecker
3
9.68%
1
20.00%
Total
31
100.00%
5
100.00%


static struct notifier_block trace_panic_notifier = {
	.notifier_call  = trace_panic_handler,
	.next           = NULL,
	.priority       = 150   /* priority: INT_MAX >= x >= 0 */
};



static int trace_die_handler(struct notifier_block *self,
			     unsigned long val,
			     void *data)
{
	switch (val) {
	case DIE_OOPS:
		if (ftrace_dump_on_oops)
			ftrace_dump(ftrace_dump_on_oops);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
40
93.02%
3
75.00%
Frédéric Weisbecker
3
6.98%
1
25.00%
Total
43
100.00%
4
100.00%


static struct notifier_block trace_die_notifier = {
	.notifier_call = trace_die_handler,
	.priority = 200
};

/*
 * printk is set to max of 1024, we really don't need it that big.
 * Nothing should be printing 1000 characters anyway.
 */

#define TRACE_MAX_PRINT		1000

/*
 * Define here KERN_TRACE so that we have one place to modify
 * it if we decide to change what log level the ftrace dump
 * should be at.
 */

#define KERN_TRACE		KERN_EMERG


void

trace_printk_seq(struct trace_seq *s)
{
	/* Probably should print a warning here. */
	if (s->seq.len >= TRACE_MAX_PRINT)
		s->seq.len = TRACE_MAX_PRINT;

	/*
         * More paranoid code. Although the buffer size is set to
         * PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just
         * an extra layer of protection.
         */
	if (WARN_ON_ONCE(s->seq.len >= s->seq.size))
		s->seq.len = s->seq.size - 1;

	/* should be zero ended, but we are paranoid. */
	s->buffer[s->seq.len] = 0;

	printk(KERN_TRACE "%s", s->buffer);

	trace_seq_init(s);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
88
97.78%
6
85.71%
Jovi Zhangwei
2
2.22%
1
14.29%
Total
90
100.00%
7
100.00%



void trace_init_global_iter(struct trace_iterator *iter)
{
	iter->tr = &global_trace;
	iter->trace = iter->tr->current_trace;
	iter->cpu_file = RING_BUFFER_ALL_CPUS;
	iter->trace_buffer = &global_trace.trace_buffer;

	if (iter->trace && iter->trace->open)
		iter->trace->open(iter);

	/* Annotate start of buffers if we had overruns */
	if (ring_buffer_overruns(iter->trace_buffer->buffer))
		iter->iter_flags |= TRACE_FILE_ANNOTATE;

	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
	if (trace_clocks[iter->tr->clock_id].in_ns)
		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Cody P Schafer
59
58.42%
1
20.00%
Jason Wessel
29
28.71%
1
20.00%
Steven Rostedt
13
12.87%
3
60.00%
Total
101
100.00%
5
100.00%



void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
{
	/* use static because iter can be a bit big for the stack */
	static struct trace_iterator iter;
	static atomic_t dump_running;
	struct trace_array *tr = &global_trace;
	unsigned int old_userobj;
	unsigned long flags;
	int cnt = 0, cpu;

	/* Only allow one dump user at a time. */
	if (atomic_inc_return(&dump_running) != 1) {
		atomic_dec(&dump_running);
		return;
	}

	/*
         * Always turn off tracing when we dump.
         * We don't need to show trace output of what happens
         * between multiple crashes.
         *
         * If the user does a sysrq-z, then they can re-enable
         * tracing with echo 1 > tracing_on.
         */
	tracing_off();

	local_irq_save(flags);

	/* Simulate the iterator */
	trace_init_global_iter(&iter);

	for_each_tracing_cpu(cpu) {
		atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
	}

	old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ;

	/* don't look at user memory in panic mode */
	tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;

	switch (oops_dump_mode) {
	case DUMP_ALL:
		iter.cpu_file = RING_BUFFER_ALL_CPUS;
		break;
	case DUMP_ORIG:
		iter.cpu_file = raw_smp_processor_id();
		break;
	case DUMP_NONE:
		goto out_enable;
	default:
		printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n");
		iter.cpu_file = RING_BUFFER_ALL_CPUS;
	}

	printk(KERN_TRACE "Dumping ftrace buffer:\n");

	/* Did function tracer already get disabled? */
	if (ftrace_is_dead()) {
		printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
		printk("#          MAY BE MISSING FUNCTION EVENTS\n");
	}

	/*
         * We need to stop all tracing on all CPUS to read the
         * the next buffer. This is a bit expensive, but is
         * not done often. We fill all what we can read,
         * and then release the locks again.
         */

	while (!trace_empty(&iter)) {

		if (!cnt)
			printk(KERN_TRACE "---------------------------------\n");

		cnt++;

		/* reset all but tr, trace, and overruns */
		memset(&iter.seq, 0,
		       sizeof(struct trace_iterator) -
		       offsetof(struct trace_iterator, seq));
		iter.iter_flags |= TRACE_FILE_LAT_FMT;
		iter.pos = -1;

		if (trace_find_next_entry_inc(&iter) != NULL) {
			int ret;

			ret = print_trace_line(&iter);
			if (ret != TRACE_TYPE_NO_CONSUME)
				trace_consume(&iter);
		}
		touch_nmi_watchdog();

		trace_printk_seq(&iter.seq);
	}

	if (!cnt)
		printk(KERN_TRACE "   (ftrace buffer empty)\n");
	else
		printk(KERN_TRACE "---------------------------------\n");

 out_enable:
	tr->trace_flags |= old_userobj;

	for_each_tracing_cpu(cpu) {
		atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
	}
 	atomic_dec(&dump_running);
	local_irq_restore(flags);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
242
67.79%
13
65.00%
Frédéric Weisbecker
86
24.09%
2
10.00%
Lai Jiangshan
11
3.08%
1
5.00%
Jason Wessel
10
2.80%
1
5.00%
Török Edwin
6
1.68%
1
5.00%
Jovi Zhang
1
0.28%
1
5.00%
Umesh Tiwari
1
0.28%
1
5.00%
Total
357
100.00%
20
100.00%


EXPORT_SYMBOL_GPL(ftrace_dump);



__init static int tracer_alloc_buffers(void)
{
	int ring_buf_size;
	int ret = -ENOMEM;

	/*
         * Make sure we don't accidently add more trace options
         * than we have bits for.
         */
	BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE);

	if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
		goto out;

	if (!alloc_cpumask_var(&global_trace.tracing_cpumask, GFP_KERNEL))
		goto out_free_buffer_mask;

	/* Only allocate trace_printk buffers if a trace_printk exists */
	if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt)
		/* Must be called before global_trace.buffer is allocated */
		trace_printk_init_buffers();

	/* To save memory, keep the ring buffer size to its minimum */
	if (ring_buffer_expanded)
		ring_buf_size = trace_buf_size;
	else
		ring_buf_size = 1;

	cpumask_copy(tracing_buffer_mask, cpu_possible_mask);
	cpumask_copy(global_trace.tracing_cpumask, cpu_all_mask);

	raw_spin_lock_init(&global_trace.start_lock);

	/*
         * The prepare callbacks allocates some memory for the ring buffer. We
         * don't free the buffer if the if the CPU goes down. If we were to free
         * the buffer, then the user would lose any trace that was in the
         * buffer. The memory will be removed once the "instance" is removed.
         */
	ret = cpuhp_setup_state_multi(CPUHP_TRACE_RB_PREPARE,
				      "trace/RB:preapre", trace_rb_cpu_prepare,
				      NULL);
	if (ret < 0)
		goto out_free_cpumask;
	/* Used for event triggers */
	temp_buffer = ring_buffer_alloc(PAGE_SIZE, RB_FL_OVERWRITE);
	if (!temp_buffer)
		goto out_rm_hp_state;

	if (trace_create_savedcmd() < 0)
		goto out_free_temp_buffer;

	/* TODO: make the number of buffers hot pluggable with CPUS */
	if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) {
		printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
		WARN_ON(1);
		goto out_free_savedcmd;
	}

	if (global_trace.buffer_disabled)
		tracing_off();

	if (trace_boot_clock) {
		ret = tracing_set_clock(&global_trace, trace_boot_clock);
		if (ret < 0)
			pr_warn("Trace clock %s not defined, going back to default\n",
				trace_boot_clock);
	}

	/*
         * register_tracer() might reference current_trace, so it
         * needs to be set before we register anything. This is
         * just a bootstrap of current_trace anyway.
         */
	global_trace.current_trace = &nop_trace;

	global_trace.max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;

	ftrace_init_global_array_ops(&global_trace);

	init_trace_flags_index(&global_trace);

	register_tracer(&nop_trace);

	/* All seems OK, enable tracing */
	tracing_disabled = 0;

	atomic_notifier_chain_register(&panic_notifier_list,
				       &trace_panic_notifier);

	register_die_notifier(&trace_die_notifier);

	global_trace.flags = TRACE_ARRAY_FL_GLOBAL;

	INIT_LIST_HEAD(&global_trace.systems);
	INIT_LIST_HEAD(&global_trace.events);
	list_add(&global_trace.list, &ftrace_trace_arrays);

	apply_trace_boot_options();

	register_snapshot_cmd();

	return 0;

out_free_savedcmd:
	free_saved_cmdlines_buffer(savedcmd);
out_free_temp_buffer:
	ring_buffer_free(temp_buffer);
out_rm_hp_state:
	cpuhp_remove_multi_state(CPUHP_TRACE_RB_PREPARE);
out_free_cpumask:
	free_cpumask_var(global_trace.tracing_cpumask);
out_free_buffer_mask:
	free_cpumask_var(tracing_buffer_mask);
out:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
231
63.81%
24
72.73%
Rusty Russell
67
18.51%
1
3.03%
Sebastian Andrzej Siewior
31
8.56%
1
3.03%
Yoshihiro Yunomae
18
4.97%
1
3.03%
Alexander Z Lam
6
1.66%
1
3.03%
Vaibhav Nagarnaik
4
1.10%
2
6.06%
Frédéric Weisbecker
2
0.55%
1
3.03%
Jiaxing Wang
2
0.55%
1
3.03%
Joe Perches
1
0.28%
1
3.03%
Total
362
100.00%
33
100.00%



void __init trace_init(void)
{
	if (tracepoint_printk) {
		tracepoint_print_iter =
			kmalloc(sizeof(*tracepoint_print_iter), GFP_KERNEL);
		if (WARN_ON(!tracepoint_print_iter))
			tracepoint_printk = 0;
		else
			static_key_enable(&tracepoint_printk_key.key);
	}
	tracer_alloc_buffers();
	trace_event_init();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
54
100.00%
3
100.00%
Total
54
100.00%
3
100.00%



__init static int clear_boot_tracer(void)
{
	/*
         * The default tracer at boot buffer is an init section.
         * This function is called in lateinit. If we did not
         * find the boot tracer, then clear it out, to prevent
         * later registration from accessing the buffer that is
         * about to be freed.
         */
	if (!default_bootup_tracer)
		return 0;

	printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n",
	       default_bootup_tracer);
	default_bootup_tracer = NULL;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%


fs_initcall(tracer_init_tracefs);

late_initcall(clear_boot_tracer);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
20235
65.18%
285
50.53%
Frédéric Weisbecker
1558
5.02%
32
5.67%
Vaibhav Nagarnaik
941
3.03%
7
1.24%
Yoshihiro Yunomae
906
2.92%
4
0.71%
Ingo Molnar
767
2.47%
21
3.72%
Hiraku Toyooka
603
1.94%
4
0.71%
Eduard - Gabriel Munteanu
562
1.81%
2
0.35%
Jiri Olsa
501
1.61%
7
1.24%
Chunyan Zhang
458
1.48%
1
0.18%
Lai Jiangshan
432
1.39%
12
2.13%
Zhao Lei
302
0.97%
3
0.53%
Tom Zanussi
295
0.95%
19
3.37%
Li Zefan
294
0.95%
14
2.48%
Stanislav Fomichev
259
0.83%
1
0.18%
Oleg Nesterov
249
0.80%
6
1.06%
Pekka Paalanen
201
0.65%
4
0.71%
Alexander Z Lam
193
0.62%
6
1.06%
Masami Hiramatsu
163
0.53%
4
0.71%
Peter Zijlstra
162
0.52%
6
1.06%
Jiaxing Wang
125
0.40%
3
0.53%
Rusty Russell
124
0.40%
2
0.35%
Arnaldo Carvalho de Melo
100
0.32%
7
1.24%
Török Edwin
90
0.29%
3
0.53%
Linus Torvalds
89
0.29%
2
0.35%
Avadh Patel
82
0.26%
1
0.18%
Arnd Bergmann
77
0.25%
1
0.18%
Jens Axboe
76
0.24%
1
0.18%
Tim Bird
75
0.24%
1
0.18%
Thomas Gleixner
71
0.23%
8
1.42%
Jovi Zhangwei
68
0.22%
4
0.71%
Andrew Lutomirski
62
0.20%
1
0.18%
Chunyu Hu
62
0.20%
2
0.35%
David Sharp
59
0.19%
4
0.71%
Cody P Schafer
59
0.19%
1
0.18%
Motohiro Kosaki
57
0.18%
2
0.35%
Soeren Sandmann Pedersen
50
0.16%
1
0.18%
Jason Wessel
45
0.14%
1
0.18%
Markus Metzger
42
0.14%
1
0.18%
Slava Pestov
40
0.13%
2
0.35%
Al Viro
39
0.13%
5
0.89%
Carsten Emde
37
0.12%
3
0.53%
David S. Miller
33
0.11%
1
0.18%
Sebastian Andrzej Siewior
31
0.10%
1
0.18%
Namhyung Kim
29
0.09%
6
1.06%
Rabin Vincent
29
0.09%
2
0.35%
Luis Claudio R. Goncalves
23
0.07%
1
0.18%
Mandeep Singh Baines
19
0.06%
1
0.18%
Joe Perches
19
0.06%
1
0.18%
Peter Hüwe
17
0.05%
1
0.18%
Eric W. Biedermann
17
0.05%
2
0.35%
Geyslan G. Bem
16
0.05%
1
0.18%
Dan Carpenter
14
0.05%
3
0.53%
Rasmus Villemoes
14
0.05%
2
0.35%
Hannes Eder
12
0.04%
2
0.35%
Tejun Heo
12
0.04%
2
0.35%
Sasha Levin
10
0.03%
1
0.18%
Marcin Ślusarz
10
0.03%
1
0.18%
Joel Fernandes
9
0.03%
2
0.35%
Julia Lawall
8
0.03%
1
0.18%
Drew Richardson
8
0.03%
1
0.18%
Chen Gang S
8
0.03%
2
0.35%
Andrey Vagin
7
0.02%
1
0.18%
Eric Dumazet
7
0.02%
1
0.18%
Shan Wei
7
0.02%
2
0.35%
Anton Blanchard
6
0.02%
1
0.18%
Michael Ellerman
6
0.02%
1
0.18%
Paul E. McKenney
5
0.02%
1
0.18%
Anton Vorontsov
5
0.02%
1
0.18%
Harvey Harrison
5
0.02%
1
0.18%
Wei Yongjun
5
0.02%
1
0.18%
Borislav Petkov
5
0.02%
1
0.18%
David Howells
3
0.01%
1
0.18%
Wang Tianhong
3
0.01%
1
0.18%
Clark Williams
3
0.01%
1
0.18%
Gil Fruchter
3
0.01%
2
0.35%
Abhishek Sagar
2
0.01%
1
0.18%
Wang YanQing
2
0.01%
2
0.35%
Dmitri Vorobiev
2
0.01%
1
0.18%
Josh Triplett
2
0.01%
1
0.18%
Christoph Lameter
2
0.01%
1
0.18%
Fabian Frederick
2
0.01%
1
0.18%
Heiko Carstens
2
0.01%
1
0.18%
Ankita Garg
1
0.00%
1
0.18%
Roel Kluin
1
0.00%
1
0.18%
Lucas De Marchi
1
0.00%
1
0.18%
Frans Klaver
1
0.00%
1
0.18%
Umesh Tiwari
1
0.00%
1
0.18%
Jovi Zhang
1
0.00%
1
0.18%
Alexey Dobriyan
1
0.00%
1
0.18%
Tony Luck
1
0.00%
1
0.18%
James Morris
1
0.00%
1
0.18%
Daniel Walter
1
0.00%
1
0.18%
Sam Ravnborg
1
0.00%
1
0.18%
Pavankumar Kondeti
1
0.00%
1
0.18%
Richard Weinberger
0.00%
0
0.00%
Total
31044
100.00%
564
100.00%
Directory: kernel/trace

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