Release 4.7 drivers/staging/lustre/lnet/libcfs/tracefile.h
/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#ifndef __LIBCFS_TRACEFILE_H__
#define __LIBCFS_TRACEFILE_H__
#include "../../include/linux/libcfs/libcfs.h"
enum cfs_trace_buf_type {
CFS_TCD_TYPE_PROC = 0,
CFS_TCD_TYPE_SOFTIRQ,
CFS_TCD_TYPE_IRQ,
CFS_TCD_TYPE_MAX
};
/* trace file lock routines */
#define TRACEFILE_NAME_SIZE 1024
extern char cfs_tracefile[TRACEFILE_NAME_SIZE];
extern long long cfs_tracefile_size;
void libcfs_run_debug_log_upcall(char *file);
int cfs_tracefile_init_arch(void);
void cfs_tracefile_fini_arch(void);
void cfs_tracefile_read_lock(void);
void cfs_tracefile_read_unlock(void);
void cfs_tracefile_write_lock(void);
void cfs_tracefile_write_unlock(void);
int cfs_tracefile_dump_all_pages(char *filename);
void cfs_trace_debug_print(void);
void cfs_trace_flush_pages(void);
int cfs_trace_start_thread(void);
void cfs_trace_stop_thread(void);
int cfs_tracefile_init(int max_pages);
void cfs_tracefile_exit(void);
int cfs_trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
const char __user *usr_buffer, int usr_buffer_nob);
int cfs_trace_copyout_string(char __user *usr_buffer, int usr_buffer_nob,
const char *knl_str, char *append);
int cfs_trace_allocate_string_buffer(char **str, int nob);
int cfs_trace_dump_debug_buffer_usrstr(void __user *usr_str, int usr_str_nob);
int cfs_trace_daemon_command(char *str);
int cfs_trace_daemon_command_usrstr(void __user *usr_str, int usr_str_nob);
int cfs_trace_set_debug_mb(int mb);
int cfs_trace_get_debug_mb(void);
void libcfs_debug_dumplog_internal(void *arg);
void libcfs_register_panic_notifier(void);
void libcfs_unregister_panic_notifier(void);
extern int libcfs_panic_in_progress;
int cfs_trace_max_debug_mb(void);
#define TCD_MAX_PAGES (5 << (20 - PAGE_SHIFT))
#define TCD_STOCK_PAGES (TCD_MAX_PAGES)
#define CFS_TRACEFILE_SIZE (500 << 20)
#ifdef LUSTRE_TRACEFILE_PRIVATE
/*
* Private declare for tracefile
*/
#define TCD_MAX_PAGES (5 << (20 - PAGE_SHIFT))
#define TCD_STOCK_PAGES (TCD_MAX_PAGES)
#define CFS_TRACEFILE_SIZE (500 << 20)
/*
* Size of a buffer for sprinting console messages if we can't get a page
* from system
*/
#define CFS_TRACE_CONSOLE_BUFFER_SIZE 1024
union cfs_trace_data_union {
struct cfs_trace_cpu_data {
/*
* Even though this structure is meant to be per-CPU, locking
* is needed because in some places the data may be accessed
* from other CPUs. This lock is directly used in trace_get_tcd
* and trace_put_tcd, which are called in libcfs_debug_vmsg2 and
* tcd_for_each_type_lock
*/
spinlock_t tcd_lock;
unsigned long tcd_lock_flags;
/*
* pages with trace records not yet processed by tracefiled.
*/
struct list_head tcd_pages;
/* number of pages on ->tcd_pages */
unsigned long tcd_cur_pages;
/*
* pages with trace records already processed by
* tracefiled. These pages are kept in memory, so that some
* portion of log can be written in the event of LBUG. This
* list is maintained in LRU order.
*
* Pages are moved to ->tcd_daemon_pages by tracefiled()
* (put_pages_on_daemon_list()). LRU pages from this list are
* discarded when list grows too large.
*/
struct list_head tcd_daemon_pages;
/* number of pages on ->tcd_daemon_pages */
unsigned long tcd_cur_daemon_pages;
/*
* Maximal number of pages allowed on ->tcd_pages and
* ->tcd_daemon_pages each.
* Always TCD_MAX_PAGES * tcd_pages_factor / 100 in current
* implementation.
*/
unsigned long tcd_max_pages;
/*
* preallocated pages to write trace records into. Pages from
* ->tcd_stock_pages are moved to ->tcd_pages by
* portals_debug_msg().
*
* This list is necessary, because on some platforms it's
* impossible to perform efficient atomic page allocation in a
* non-blockable context.
*
* Such platforms fill ->tcd_stock_pages "on occasion", when
* tracing code is entered in blockable context.
*
* trace_get_tage_try() tries to get a page from
* ->tcd_stock_pages first and resorts to atomic page
* allocation only if this queue is empty. ->tcd_stock_pages
* is replenished when tracing code is entered in blocking
* context (darwin-tracefile.c:trace_get_tcd()). We try to
* maintain TCD_STOCK_PAGES (40 by default) pages in this
* queue. Atomic allocation is only required if more than
* TCD_STOCK_PAGES pagesful are consumed by trace records all
* emitted in non-blocking contexts. Which is quite unlikely.
*/
struct list_head tcd_stock_pages;
/* number of pages on ->tcd_stock_pages */
unsigned long tcd_cur_stock_pages;
unsigned short tcd_shutting_down;
unsigned short tcd_cpu;
unsigned short tcd_type;
/* The factors to share debug memory. */
unsigned short tcd_pages_factor;
}
tcd;
char __pad[L1_CACHE_ALIGN(sizeof(struct cfs_trace_cpu_data))];
};
#define TCD_MAX_TYPES 8
extern union cfs_trace_data_union (*cfs_trace_data[TCD_MAX_TYPES])[NR_CPUS];
#define cfs_tcd_for_each(tcd, i, j) \
for (i = 0; cfs_trace_data[i]; i++) \
for (j = 0, ((tcd) = &(*cfs_trace_data[i])[j].tcd); \
j < num_possible_cpus(); \
j++, (tcd) = &(*cfs_trace_data[i])[j].tcd)
#define cfs_tcd_for_each_type_lock(tcd, i, cpu) \
for (i = 0; cfs_trace_data[i] && \
(tcd = &(*cfs_trace_data[i])[cpu].tcd) && \
cfs_trace_lock_tcd(tcd, 1); cfs_trace_unlock_tcd(tcd, 1), i++)
void cfs_set_ptldebug_header(struct ptldebug_header *header,
struct libcfs_debug_msg_data *m,
unsigned long stack);
void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
const char *buf, int len, const char *file,
const char *fn);
int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking);
extern char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
enum cfs_trace_buf_type cfs_trace_buf_idx_get(void);
static inline char *
cfs_trace_get_console_buffer(void)
{
unsigned int i = get_cpu();
unsigned int j = cfs_trace_buf_idx_get();
return cfs_trace_console_buffers[i][j];
}
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static inline struct cfs_trace_cpu_data *
cfs_trace_get_tcd(void)
{
struct cfs_trace_cpu_data *tcd =
&(*cfs_trace_data[cfs_trace_buf_idx_get()])[get_cpu()].tcd;
cfs_trace_lock_tcd(tcd, 0);
return tcd;
}
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static inline void cfs_trace_put_tcd(struct cfs_trace_cpu_data *tcd)
{
cfs_trace_unlock_tcd(tcd, 0);
put_cpu();
}
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int cfs_trace_refill_stock(struct cfs_trace_cpu_data *tcd, gfp_t gfp,
struct list_head *stock);
void cfs_trace_assertion_failed(const char *str,
struct libcfs_debug_msg_data *m);
/* ASSERTION that is safe to use within the debug system */
#define __LASSERT(cond) \
do { \
if (unlikely(!(cond))) { \
LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_EMERG, NULL); \
cfs_trace_assertion_failed("ASSERTION("#cond") failed", \
&msgdata); \
} \
} while (0)
#define __LASSERT_TAGE_INVARIANT(tage) \
do { \
__LASSERT(tage); \
__LASSERT(tage->page); \
__LASSERT(tage->used <= PAGE_SIZE); \
__LASSERT(page_count(tage->page) > 0); \
} while (0)
#endif /* LUSTRE_TRACEFILE_PRIVATE */
#endif /* __LIBCFS_TRACEFILE_H__ */
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