6 * Copyright (C) 2009, 2010 Red Hat Inc.
7 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
14 #include <linux/kernel.h>
22 static bool no_buildid_cache;
24 int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
25 union perf_event *event,
26 struct perf_sample *sample,
27 struct perf_evsel *evsel __maybe_unused,
28 struct machine *machine)
30 struct addr_location al;
31 struct thread *thread = machine__findnew_thread(machine, sample->pid,
35 pr_err("problem processing %d event, skipping it.\n",
40 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
49 static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
50 union perf_event *event,
51 struct perf_sample *sample
53 struct machine *machine)
55 struct thread *thread = machine__findnew_thread(machine,
59 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
60 event->fork.ppid, event->fork.ptid);
63 machine__remove_thread(machine, thread);
70 struct perf_tool build_id__mark_dso_hit_ops = {
71 .sample = build_id__mark_dso_hit,
72 .mmap = perf_event__process_mmap,
73 .mmap2 = perf_event__process_mmap2,
74 .fork = perf_event__process_fork,
75 .exit = perf_event__exit_del_thread,
76 .attr = perf_event__process_attr,
77 .build_id = perf_event__process_build_id,
78 .ordered_events = true,
81 int build_id__sprintf(const u8 *build_id, int len, char *bf)
84 const u8 *raw = build_id;
87 for (i = 0; i < len; ++i) {
88 sprintf(bid, "%02x", *raw);
93 return (bid - bf) + 1;
96 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
99 u8 build_id[BUILD_ID_SIZE];
105 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
107 ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
111 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
114 int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
116 u8 build_id[BUILD_ID_SIZE];
119 ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
122 else if (ret != sizeof(build_id))
125 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
128 /* asnprintf consolidates asprintf and snprintf */
129 static int asnprintf(char **strp, size_t size, const char *fmt, ...)
139 ret = vsnprintf(*strp, size, fmt, ap);
141 ret = vasprintf(strp, fmt, ap);
147 static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
150 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
151 sbuild_id, sbuild_id + 2);
152 if (ret < 0 || (tmp && size < (unsigned int)ret))
157 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
159 char build_id_hex[SBUILD_ID_SIZE];
161 if (!dso->has_build_id)
164 build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
165 return build_id__filename(build_id_hex, bf, size);
168 bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
173 id_name = dso__build_id_filename(dso, bf, size);
176 if (access(id_name, F_OK))
178 if (lstat(id_name, &sb) == -1)
180 if ((size_t)sb.st_size > size - 1)
182 if (readlink(id_name, bf, size - 1) < 0)
185 bf[sb.st_size] = '\0';
189 * ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92
191 ch = strrchr(bf, '/');
197 return strncmp(".ko", ch - 3, 3) == 0;
200 * If dso__build_id_filename work, get id_name again,
201 * because id_name points to bf and is broken.
204 id_name = dso__build_id_filename(dso, bf, size);
205 pr_err("Invalid build id: %s\n", id_name ? :
212 #define dsos__for_each_with_build_id(pos, head) \
213 list_for_each_entry(pos, head, node) \
214 if (!pos->has_build_id) \
218 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
219 pid_t pid, u16 misc, int fd)
222 struct build_id_event b;
226 len = PERF_ALIGN(len, NAME_ALIGN);
228 memset(&b, 0, sizeof(b));
229 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
231 b.header.misc = misc;
232 b.header.size = sizeof(b) + len;
234 err = writen(fd, &b, sizeof(b));
238 return write_padded(fd, name, name_len + 1, len);
241 static int machine__write_buildid_table(struct machine *machine, int fd)
246 u16 kmisc = PERF_RECORD_MISC_KERNEL,
247 umisc = PERF_RECORD_MISC_USER;
249 if (!machine__is_host(machine)) {
250 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
251 umisc = PERF_RECORD_MISC_GUEST_USER;
254 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
257 bool in_kernel = false;
262 if (dso__is_vdso(pos)) {
263 name = pos->short_name;
264 name_len = pos->short_name_len;
265 } else if (dso__is_kcore(pos)) {
266 machine__mmap_name(machine, nm, sizeof(nm));
268 name_len = strlen(nm);
270 name = pos->long_name;
271 name_len = pos->long_name_len;
274 in_kernel = pos->kernel ||
275 is_kernel_module(name,
276 PERF_RECORD_MISC_CPUMODE_UNKNOWN);
277 err = write_buildid(name, name_len, pos->build_id, machine->pid,
278 in_kernel ? kmisc : umisc, fd);
286 int perf_session__write_buildid_table(struct perf_session *session, int fd)
289 int err = machine__write_buildid_table(&session->machines.host, fd);
294 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
295 struct machine *pos = rb_entry(nd, struct machine, rb_node);
296 err = machine__write_buildid_table(pos, fd);
303 static int __dsos__hit_all(struct list_head *head)
307 list_for_each_entry(pos, head, node)
313 static int machine__hit_all_dsos(struct machine *machine)
315 return __dsos__hit_all(&machine->dsos.head);
318 int dsos__hit_all(struct perf_session *session)
323 err = machine__hit_all_dsos(&session->machines.host);
327 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
328 struct machine *pos = rb_entry(nd, struct machine, rb_node);
330 err = machine__hit_all_dsos(pos);
338 void disable_buildid_cache(void)
340 no_buildid_cache = true;
343 static char *build_id_cache__dirname_from_path(const char *name,
344 bool is_kallsyms, bool is_vdso)
346 char *realname = (char *)name, *filename;
347 bool slash = is_kallsyms || is_vdso;
350 realname = realpath(name, NULL);
355 if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
356 is_vdso ? DSO__NAME_VDSO : realname) < 0)
365 int build_id_cache__list_build_ids(const char *pathname,
366 struct strlist **result)
371 dir_name = build_id_cache__dirname_from_path(pathname, false, false);
375 *result = lsdir(dir_name, lsdir_no_dot_filter);
383 int build_id_cache__add_s(const char *sbuild_id, const char *name,
384 bool is_kallsyms, bool is_vdso)
386 const size_t size = PATH_MAX;
387 char *realname = NULL, *filename = NULL, *dir_name = NULL,
388 *linkname = zalloc(size), *targetname, *tmp;
392 realname = realpath(name, NULL);
397 dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
401 if (mkdir_p(dir_name, 0755))
404 if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {
409 if (access(filename, F_OK)) {
411 if (copyfile("/proc/kallsyms", filename))
413 } else if (link(realname, filename) && errno != EEXIST &&
414 copyfile(name, filename))
418 if (!build_id__filename(sbuild_id, linkname, size))
420 tmp = strrchr(linkname, '/');
423 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
427 targetname = filename + strlen(buildid_dir) - 5;
428 memcpy(targetname, "../..", 5);
430 if (symlink(targetname, linkname) == 0)
441 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
442 const char *name, bool is_kallsyms,
445 char sbuild_id[SBUILD_ID_SIZE];
447 build_id__sprintf(build_id, build_id_size, sbuild_id);
449 return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
452 bool build_id_cache__cached(const char *sbuild_id)
455 char *filename = build_id__filename(sbuild_id, NULL, 0);
457 if (filename && !access(filename, F_OK))
464 int build_id_cache__remove_s(const char *sbuild_id)
466 const size_t size = PATH_MAX;
467 char *filename = zalloc(size),
468 *linkname = zalloc(size), *tmp;
471 if (filename == NULL || linkname == NULL)
474 if (!build_id__filename(sbuild_id, linkname, size))
477 if (access(linkname, F_OK))
480 if (readlink(linkname, filename, size - 1) < 0)
483 if (unlink(linkname))
487 * Since the link is relative, we must make it absolute:
489 tmp = strrchr(linkname, '/') + 1;
490 snprintf(tmp, size - (tmp - linkname), "%s", filename);
492 if (unlink(linkname))
502 static int dso__cache_build_id(struct dso *dso, struct machine *machine)
504 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
505 bool is_vdso = dso__is_vdso(dso);
506 const char *name = dso->long_name;
509 if (dso__is_kcore(dso)) {
511 machine__mmap_name(machine, nm, sizeof(nm));
514 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
515 is_kallsyms, is_vdso);
518 static int __dsos__cache_build_ids(struct list_head *head,
519 struct machine *machine)
524 dsos__for_each_with_build_id(pos, head)
525 if (dso__cache_build_id(pos, machine))
531 static int machine__cache_build_ids(struct machine *machine)
533 return __dsos__cache_build_ids(&machine->dsos.head, machine);
536 int perf_session__cache_build_ids(struct perf_session *session)
541 if (no_buildid_cache)
544 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
547 ret = machine__cache_build_ids(&session->machines.host);
549 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
550 struct machine *pos = rb_entry(nd, struct machine, rb_node);
551 ret |= machine__cache_build_ids(pos);
556 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
558 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
561 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
564 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
566 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
567 struct machine *pos = rb_entry(nd, struct machine, rb_node);
568 ret |= machine__read_build_ids(pos, with_hits);