Release 4.10 tools/perf/util/dso.c

#include <asm/bug.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "symbol.h"
#include "dso.h"
#include "machine.h"
#include "auxtrace.h"
#include "util.h"
#include "debug.h"
#include "vdso.h"



char dso__symtab_origin(const struct dso *dso)
{
	static const char origin[] = {
		[DSO_BINARY_TYPE__KALLSYMS]			= 'k',
		[DSO_BINARY_TYPE__VMLINUX]			= 'v',
		[DSO_BINARY_TYPE__JAVA_JIT]			= 'j',
		[DSO_BINARY_TYPE__DEBUGLINK]			= 'l',
		[DSO_BINARY_TYPE__BUILD_ID_CACHE]		= 'B',
		[DSO_BINARY_TYPE__FEDORA_DEBUGINFO]		= 'f',
		[DSO_BINARY_TYPE__UBUNTU_DEBUGINFO]		= 'u',
		[DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO]	= 'o',
		[DSO_BINARY_TYPE__BUILDID_DEBUGINFO]		= 'b',
		[DSO_BINARY_TYPE__SYSTEM_PATH_DSO]		= 'd',
		[DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE]		= 'K',
		[DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP]	= 'm',
		[DSO_BINARY_TYPE__GUEST_KALLSYMS]		= 'g',
		[DSO_BINARY_TYPE__GUEST_KMODULE]		= 'G',
		[DSO_BINARY_TYPE__GUEST_KMODULE_COMP]		= 'M',
		[DSO_BINARY_TYPE__GUEST_VMLINUX]		= 'V',
        };

	if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
		return '!';
	return origin[dso->symtab_type];
}

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int dso__read_binary_type_filename(const struct dso *dso,
				   enum dso_binary_type type,
				   char *root_dir, char *filename, size_t size)
{
	char build_id_hex[SBUILD_ID_SIZE];
	int ret = 0;
	size_t len;

	switch (type) {
	case DSO_BINARY_TYPE__DEBUGLINK: {
		char *debuglink;

		len = __symbol__join_symfs(filename, size, dso->long_name);
		debuglink = filename + len;
		while (debuglink != filename && *debuglink != '/')
			debuglink--;
		if (*debuglink == '/')
			debuglink++;

		ret = -1;
		if (!is_regular_file(filename))
			break;

		ret = filename__read_debuglink(filename, debuglink,
					       size - (debuglink - filename));
		}
		break;
	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
		if (dso__build_id_filename(dso, filename, size) == NULL)
			ret = -1;
		break;

	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
		len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
		snprintf(filename + len, size - len, "%s.debug", dso->long_name);
		break;

	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
		len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
		snprintf(filename + len, size - len, "%s", dso->long_name);
		break;

	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
	{
		const char *last_slash;
		size_t dir_size;

		last_slash = dso->long_name + dso->long_name_len;
		while (last_slash != dso->long_name && *last_slash != '/')
			last_slash--;

		len = __symbol__join_symfs(filename, size, "");
		dir_size = last_slash - dso->long_name + 2;
		if (dir_size > (size - len)) {
			ret = -1;
			break;
		}
		len += scnprintf(filename + len, dir_size, "%s",  dso->long_name);
		len += scnprintf(filename + len , size - len, ".debug%s",
								last_slash);
		break;
	}

	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
		if (!dso->has_build_id) {
			ret = -1;
			break;
		}

		build_id__sprintf(dso->build_id,
				  sizeof(dso->build_id),
				  build_id_hex);
		len = __symbol__join_symfs(filename, size, "/usr/lib/debug/.build-id/");
		snprintf(filename + len, size - len, "%.2s/%s.debug",
			 build_id_hex, build_id_hex + 2);
		break;

	case DSO_BINARY_TYPE__VMLINUX:
	case DSO_BINARY_TYPE__GUEST_VMLINUX:
	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
		__symbol__join_symfs(filename, size, dso->long_name);
		break;

	case DSO_BINARY_TYPE__GUEST_KMODULE:
	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
		path__join3(filename, size, symbol_conf.symfs,
			    root_dir, dso->long_name);
		break;

	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
		__symbol__join_symfs(filename, size, dso->long_name);
		break;

	case DSO_BINARY_TYPE__KCORE:
	case DSO_BINARY_TYPE__GUEST_KCORE:
		snprintf(filename, size, "%s", dso->long_name);
		break;

	default:
	case DSO_BINARY_TYPE__KALLSYMS:
	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
	case DSO_BINARY_TYPE__JAVA_JIT:
	case DSO_BINARY_TYPE__NOT_FOUND:
		ret = -1;
		break;
	}

	return ret;
}

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static const struct {
	
const char *fmt;
	
int (*decompress)(const char *input, int output);
} 
compressions[] = {
#ifdef HAVE_ZLIB_SUPPORT
	{ "gz", gzip_decompress_to_file },
#endif
#ifdef HAVE_LZMA_SUPPORT
	{ "xz", lzma_decompress_to_file },
#endif
	{ NULL, NULL },
};



bool is_supported_compression(const char *ext)
{
	unsigned i;

	for (i = 0; compressions[i].fmt; i++) {
		if (!strcmp(ext, compressions[i].fmt))
			return true;
	}
	return false;
}

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bool is_kernel_module(const char *pathname, int cpumode)
{
	struct kmod_path m;
	int mode = cpumode & PERF_RECORD_MISC_CPUMODE_MASK;

	WARN_ONCE(mode != cpumode,
		  "Internal error: passing unmasked cpumode (%x) to is_kernel_module",
		  cpumode);

	switch (mode) {
	case PERF_RECORD_MISC_USER:
	case PERF_RECORD_MISC_HYPERVISOR:
	case PERF_RECORD_MISC_GUEST_USER:
		return false;
	/* Treat PERF_RECORD_MISC_CPUMODE_UNKNOWN as kernel */
	default:
		if (kmod_path__parse(&m, pathname)) {
			pr_err("Failed to check whether %s is a kernel module or not. Assume it is.",
					pathname);
			return true;
		}
	}

	return m.kmod;
}

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bool decompress_to_file(const char *ext, const char *filename, int output_fd)
{
	unsigned i;

	for (i = 0; compressions[i].fmt; i++) {
		if (!strcmp(ext, compressions[i].fmt))
			return !compressions[i].decompress(filename,
							   output_fd);
	}
	return false;
}

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bool dso__needs_decompress(struct dso *dso)
{
	return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
}

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/*
 * Parses kernel module specified in @path and updates
 * @m argument like:
 *
 *    @comp - true if @path contains supported compression suffix,
 *            false otherwise
 *    @kmod - true if @path contains '.ko' suffix in right position,
 *            false otherwise
 *    @name - if (@alloc_name && @kmod) is true, it contains strdup-ed base name
 *            of the kernel module without suffixes, otherwise strudup-ed
 *            base name of @path
 *    @ext  - if (@alloc_ext && @comp) is true, it contains strdup-ed string
 *            the compression suffix
 *
 * Returns 0 if there's no strdup error, -ENOMEM otherwise.
 */


int __kmod_path__parse(struct kmod_path *m, const char *path,
		       bool alloc_name, bool alloc_ext)
{
	const char *name = strrchr(path, '/');
	const char *ext  = strrchr(path, '.');
	bool is_simple_name = false;

	memset(m, 0x0, sizeof(*m));
	name = name ? name + 1 : path;

	/*
         * '.' is also a valid character for module name. For example:
         * [aaa.bbb] is a valid module name. '[' should have higher
         * priority than '.ko' suffix.
         *
         * The kernel names are from machine__mmap_name. Such
         * name should belong to kernel itself, not kernel module.
         */
	if (name[0] == '[') {
		is_simple_name = true;
		if ((strncmp(name, "[kernel.kallsyms]", 17) == 0) ||
		    (strncmp(name, "[guest.kernel.kallsyms", 22) == 0) ||
		    (strncmp(name, "[vdso]", 6) == 0) ||
		    (strncmp(name, "[vsyscall]", 10) == 0)) {
			m->kmod = false;

		} else
			m->kmod = true;
	}

	/* No extension, just return name. */
	if ((ext == NULL) || is_simple_name) {
		if (alloc_name) {
			m->name = strdup(name);
			return m->name ? 0 : -ENOMEM;
		}
		return 0;
	}

	if (is_supported_compression(ext + 1)) {
		m->comp = true;
		ext -= 3;
	}

	/* Check .ko extension only if there's enough name left. */
	if (ext > name)
		m->kmod = !strncmp(ext, ".ko", 3);

	if (alloc_name) {
		if (m->kmod) {
			if (asprintf(&m->name, "[%.*s]", (int) (ext - name), name) == -1)
				return -ENOMEM;
		} else {
			if (asprintf(&m->name, "%s", name) == -1)
				return -ENOMEM;
		}

		strxfrchar(m->name, '-', '_');
	}

	if (alloc_ext && m->comp) {
		m->ext = strdup(ext + 4);
		if (!m->ext) {
			free((void *) m->name);
			return -ENOMEM;
		}
	}

	return 0;
}

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/*
 * Global list of open DSOs and the counter.
 */
static LIST_HEAD(dso__data_open);

static long dso__data_open_cnt;

static pthread_mutex_t dso__data_open_lock = PTHREAD_MUTEX_INITIALIZER;



static void dso__list_add(struct dso *dso)
{
	list_add_tail(&dso->data.open_entry, &dso__data_open);
	dso__data_open_cnt++;
}

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static void dso__list_del(struct dso *dso)
{
	list_del(&dso->data.open_entry);
	WARN_ONCE(dso__data_open_cnt <= 0,
		  "DSO data fd counter out of bounds.");
	dso__data_open_cnt--;
}

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static void close_first_dso(void);



static int do_open(char *name)
{
	int fd;
	char sbuf[STRERR_BUFSIZE];

	do {
		fd = open(name, O_RDONLY);
		if (fd >= 0)
			return fd;

		pr_debug("dso open failed: %s\n",
			 str_error_r(errno, sbuf, sizeof(sbuf)));
		if (!dso__data_open_cnt || errno != EMFILE)
			break;

		close_first_dso();
	} while (1);

	return -1;
}

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static int __open_dso(struct dso *dso, struct machine *machine)
{
	int fd;
	char *root_dir = (char *)"";
	char *name = malloc(PATH_MAX);

	if (!name)
		return -ENOMEM;

	if (machine)
		root_dir = machine->root_dir;

	if (dso__read_binary_type_filename(dso, dso->binary_type,
					    root_dir, name, PATH_MAX)) {
		free(name);
		return -EINVAL;
	}

	if (!is_regular_file(name))
		return -EINVAL;

	fd = do_open(name);
	free(name);
	return fd;
}

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static void check_data_close(void);

/**
 * dso_close - Open DSO data file
 * @dso: dso object
 *
 * Open @dso's data file descriptor and updates
 * list/count of open DSO objects.
 */


static int open_dso(struct dso *dso, struct machine *machine)
{
	int fd = __open_dso(dso, machine);

	if (fd >= 0) {
		dso__list_add(dso);
		/*
                 * Check if we crossed the allowed number
                 * of opened DSOs and close one if needed.
                 */
		check_data_close();
	}

	return fd;
}

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static void close_data_fd(struct dso *dso)
{
	if (dso->data.fd >= 0) {
		close(dso->data.fd);
		dso->data.fd = -1;
		dso->data.file_size = 0;
		dso__list_del(dso);
	}
}

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/**
 * dso_close - Close DSO data file
 * @dso: dso object
 *
 * Close @dso's data file descriptor and updates
 * list/count of open DSO objects.
 */


static void close_dso(struct dso *dso)
{
	close_data_fd(dso);
}

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static void close_first_dso(void)
{
	struct dso *dso;

	dso = list_first_entry(&dso__data_open, struct dso, data.open_entry);
	close_dso(dso);
}

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static rlim_t get_fd_limit(void)
{
	struct rlimit l;
	rlim_t limit = 0;

	/* Allow half of the current open fd limit. */
	if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
		if (l.rlim_cur == RLIM_INFINITY)
			limit = l.rlim_cur;
		else
			limit = l.rlim_cur / 2;
	} else {
		pr_err("failed to get fd limit\n");
		limit = 1;
	}

	return limit;
}

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static rlim_t fd_limit;

/*
 * Used only by tests/dso-data.c to reset the environment
 * for tests. I dont expect we should change this during
 * standard runtime.
 */


void reset_fd_limit(void)
{
	fd_limit = 0;
}

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static bool may_cache_fd(void)
{
	if (!fd_limit)
		fd_limit = get_fd_limit();

	if (fd_limit == RLIM_INFINITY)
		return true;

	return fd_limit > (rlim_t) dso__data_open_cnt;
}

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/*
 * Check and close LRU dso if we crossed allowed limit
 * for opened dso file descriptors. The limit is half
 * of the RLIMIT_NOFILE files opened.
*/


static void check_data_close(void)
{
	bool cache_fd = may_cache_fd();

	if (!cache_fd)
		close_first_dso();
}

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/**
 * dso__data_close - Close DSO data file
 * @dso: dso object
 *
 * External interface to close @dso's data file descriptor.
 */


void dso__data_close(struct dso *dso)
{
	pthread_mutex_lock(&dso__data_open_lock);
	close_dso(dso);
	pthread_mutex_unlock(&dso__data_open_lock);
}

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static void try_to_open_dso(struct dso *dso, struct machine *machine)
{
	enum dso_binary_type binary_type_data[] = {
		DSO_BINARY_TYPE__BUILD_ID_CACHE,
		DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
		DSO_BINARY_TYPE__NOT_FOUND,
        };
	int i = 0;

	if (dso->data.fd >= 0)
		return;

	if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) {
		dso->data.fd = open_dso(dso, machine);
		goto out;
	}

	do {
		dso->binary_type = binary_type_data[i++];

		dso->data.fd = open_dso(dso, machine);
		if (dso->data.fd >= 0)
			goto out;

	} while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND);
out:
	if (dso->data.fd >= 0)
		dso->data.status = DSO_DATA_STATUS_OK;
	else
		dso->data.status = DSO_DATA_STATUS_ERROR;
}

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/**
 * dso__data_get_fd - Get dso's data file descriptor
 * @dso: dso object
 * @machine: machine object
 *
 * External interface to find dso's file, open it and
 * returns file descriptor.  It should be paired with
 * dso__data_put_fd() if it returns non-negative value.
 */


int dso__data_get_fd(struct dso *dso, struct machine *machine)
{
	if (dso->data.status == DSO_DATA_STATUS_ERROR)
		return -1;

	if (pthread_mutex_lock(&dso__data_open_lock) < 0)
		return -1;

	try_to_open_dso(dso, machine);

	if (dso->data.fd < 0)
		pthread_mutex_unlock(&dso__data_open_lock);

	return dso->data.fd;
}

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void dso__data_put_fd(struct dso *dso __maybe_unused)
{
	pthread_mutex_unlock(&dso__data_open_lock);
}

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namhyung kim
namhyung kim
17
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1
100.00%
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17
100.00%
1
100.00%



bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by)
{
	u32 flag = 1 << by;

	if (dso->data.status_seen & flag)
		return true;

	dso->data.status_seen |= flag;

	return false;
}

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adrian hunter
adrian hunter
45
100.00%
1
100.00%
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45
100.00%
1
100.00%


static void

dso_cache__free(struct dso *dso)
{
	struct rb_root *root = &dso->data.cache;
	struct rb_node *next = rb_first(root);

	pthread_mutex_lock(&dso->lock);
	while (next) {
		struct dso_cache *cache;

		cache = rb_entry(next, struct dso_cache, rb_node);
		next = rb_next(&cache->rb_node);
		rb_erase(&cache->rb_node, root);
		free(cache);
	}
	pthread_mutex_unlock(&dso->lock);
}

Contributors
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jiri olsa
jiri olsa
67
69.07%
1
50.00%
namhyung kim
namhyung kim
30
30.93%
1
50.00%
Total
97
100.00%
2
100.00%



static struct dso_cache *dso_cache__find(struct dso *dso, u64 offset)
{
	const struct rb_root *root = &dso->data.cache;
	struct rb_node * const *p = &root->rb_node;
	const struct rb_node *parent = NULL;
	struct dso_cache *cache;

	while (*p != NULL) {
		u64 end;

		parent = *p;
		cache = rb_entry(parent, struct dso_cache, rb_node);
		end = cache->offset + DSO__DATA_CACHE_SIZE;

		if (offset < cache->offset)
			p = &(*p)->rb_left;
		else if (offset >= end)
			p = &(*p)->rb_right;
		else
			return cache;
	}

	return NULL;
}

Contributors
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jiri olsa
jiri olsa
116
87.22%
1
33.33%
namhyung kim
namhyung kim
15
11.28%
1
33.33%
arnaldo carvalho de melo
arnaldo carvalho de melo
2
1.50%
1
33.33%
Total
133
100.00%
3
100.00%


static struct dso_cache *

dso_cache__insert(struct dso *dso, struct dso_cache *new)
{
	struct rb_root *root = &dso->data.cache;
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct dso_cache *cache;
	u64 offset = new->offset;

	pthread_mutex_lock(&dso->lock);
	while (*p != NULL) {
		u64 end;

		parent = *p;
		cache = rb_entry(parent, struct dso_cache, rb_node);
		end = cache->offset + DSO__DATA_CACHE_SIZE;

		if (offset < cache->offset)
			p = &(*p)->rb_left;
		else if (offset >= end)
			p = &(*p)->rb_right;
		else
			goto out;
	}

	rb_link_node(&new->rb_node, parent, p);
	rb_insert_color(&new->rb_node, root);

	cache = NULL;
out:
	pthread_mutex_unlock(&dso->lock);
	return cache;
}

Contributors
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jiri olsa
jiri olsa
137
74.86%
1
50.00%
namhyung kim
namhyung kim
46
25.14%
1
50.00%
Total
183
100.00%
2
100.00%


static ssize_t

dso_cache__memcpy(struct dso_cache *cache, u64 offset,
		  u8 *data, u64 size)
{
	u64 cache_offset = offset - cache->offset;
	u64 cache_size   = min(cache->size - cache_offset, size);

	memcpy(data, cache->data + cache_offset, cache_size);
	return cache_size;
}

Contributors
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jiri olsa
jiri olsa
60
100.00%
1
100.00%
Total
60
100.00%
1
100.00%


static ssize_t

dso_cache__read(struct dso *dso, struct machine *machine,
		u64 offset, u8 *data, ssize_t size)
{
	struct dso_cache *cache;
	struct dso_cache *old;
	ssize_t ret;

	do {
		u64 cache_offset;

		cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
		if (!cache)
			return -ENOMEM;

		pthread_mutex_lock(&dso__data_open_lock);

		/*
                 * dso->data.fd might be closed if other thread opened another
                 * file (dso) due to open file limit (RLIMIT_NOFILE).
                 */
		try_to_open_dso(dso, machine);

		if (dso->data.fd < 0) {
			ret = -errno;
			dso->data.status = DSO_DATA_STATUS_ERROR;
			break;
		}

		cache_offset = offset & DSO__DATA_CACHE_MASK;

		ret = pread(dso->data.fd, cache->data, DSO__DATA_CACHE_SIZE, cache_offset);
		if (ret <= 0)
			break;

		cache->offset = cache_offset;
		cache->size   = ret;
	} while (0);

	pthread_mutex_unlock(&dso__data_open_lock);

	if (ret > 0) {
		old = dso_cache__insert(dso, cache);
		if (old) {
			/* we lose the race */
			free(cache);
			cache = old