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 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
32 struct thread *thread = machine__findnew_thread(machine, sample->pid,
36 pr_err("problem processing %d event, skipping it.\n",
41 thread__find_addr_map(thread, 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 rb_erase(&thread->rb_node, &machine->threads);
64 machine->last_match = NULL;
65 thread__delete(thread);
71 struct perf_tool build_id__mark_dso_hit_ops = {
72 .sample = build_id__mark_dso_hit,
73 .mmap = perf_event__process_mmap,
74 .mmap2 = perf_event__process_mmap2,
75 .fork = perf_event__process_fork,
76 .exit = perf_event__exit_del_thread,
77 .attr = perf_event__process_attr,
78 .build_id = perf_event__process_build_id,
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 raw - build_id;
96 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
98 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
100 if (!dso->has_build_id)
103 build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
105 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
106 build_id_hex, build_id_hex + 2) < 0)
109 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
110 build_id_hex, build_id_hex + 2);
114 #define dsos__for_each_with_build_id(pos, head) \
115 list_for_each_entry(pos, head, node) \
116 if (!pos->has_build_id) \
120 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
121 pid_t pid, u16 misc, int fd)
124 struct build_id_event b;
128 len = PERF_ALIGN(len, NAME_ALIGN);
130 memset(&b, 0, sizeof(b));
131 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
133 b.header.misc = misc;
134 b.header.size = sizeof(b) + len;
136 err = writen(fd, &b, sizeof(b));
140 return write_padded(fd, name, name_len + 1, len);
143 static int __dsos__write_buildid_table(struct list_head *head,
144 struct machine *machine,
145 pid_t pid, u16 misc, int fd)
150 dsos__for_each_with_build_id(pos, head) {
158 if (dso__is_vdso(pos)) {
159 name = pos->short_name;
160 name_len = pos->short_name_len + 1;
161 } else if (dso__is_kcore(pos)) {
162 machine__mmap_name(machine, nm, sizeof(nm));
164 name_len = strlen(nm) + 1;
166 name = pos->long_name;
167 name_len = pos->long_name_len + 1;
170 err = write_buildid(name, name_len, pos->build_id,
179 static int machine__write_buildid_table(struct machine *machine, int fd)
182 u16 kmisc = PERF_RECORD_MISC_KERNEL,
183 umisc = PERF_RECORD_MISC_USER;
185 if (!machine__is_host(machine)) {
186 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
187 umisc = PERF_RECORD_MISC_GUEST_USER;
190 err = __dsos__write_buildid_table(&machine->kernel_dsos.head, machine,
191 machine->pid, kmisc, fd);
193 err = __dsos__write_buildid_table(&machine->user_dsos.head,
194 machine, machine->pid, umisc,
199 int perf_session__write_buildid_table(struct perf_session *session, int fd)
202 int err = machine__write_buildid_table(&session->machines.host, fd);
207 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
208 struct machine *pos = rb_entry(nd, struct machine, rb_node);
209 err = machine__write_buildid_table(pos, fd);
216 static int __dsos__hit_all(struct list_head *head)
220 list_for_each_entry(pos, head, node)
226 static int machine__hit_all_dsos(struct machine *machine)
230 err = __dsos__hit_all(&machine->kernel_dsos.head);
234 return __dsos__hit_all(&machine->user_dsos.head);
237 int dsos__hit_all(struct perf_session *session)
242 err = machine__hit_all_dsos(&session->machines.host);
246 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
247 struct machine *pos = rb_entry(nd, struct machine, rb_node);
249 err = machine__hit_all_dsos(pos);
257 void disable_buildid_cache(void)
259 no_buildid_cache = true;
262 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
263 const char *name, bool is_kallsyms, bool is_vdso)
265 const size_t size = PATH_MAX;
266 char *realname, *filename = zalloc(size),
267 *linkname = zalloc(size), *targetname;
269 bool slash = is_kallsyms || is_vdso;
272 if (symbol_conf.kptr_restrict) {
273 pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
277 realname = (char *) name;
279 realname = realpath(name, NULL);
281 if (realname == NULL || filename == NULL || linkname == NULL)
284 len = scnprintf(filename, size, "%s%s%s",
285 debugdir, slash ? "/" : "",
286 is_vdso ? DSO__NAME_VDSO : realname);
287 if (mkdir_p(filename, 0755))
290 snprintf(filename + len, size - len, "/%s", sbuild_id);
292 if (access(filename, F_OK)) {
294 if (copyfile("/proc/kallsyms", filename))
296 } else if (link(realname, filename) && copyfile(name, filename))
300 len = scnprintf(linkname, size, "%s/.build-id/%.2s",
301 debugdir, sbuild_id);
303 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
306 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
307 targetname = filename + strlen(debugdir) - 5;
308 memcpy(targetname, "../..", 5);
310 if (symlink(targetname, linkname) == 0)
320 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
321 const char *name, const char *debugdir,
322 bool is_kallsyms, bool is_vdso)
324 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
326 build_id__sprintf(build_id, build_id_size, sbuild_id);
328 return build_id_cache__add_s(sbuild_id, debugdir, name,
329 is_kallsyms, is_vdso);
332 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
334 const size_t size = PATH_MAX;
335 char *filename = zalloc(size),
336 *linkname = zalloc(size);
339 if (filename == NULL || linkname == NULL)
342 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
343 debugdir, sbuild_id, sbuild_id + 2);
345 if (access(linkname, F_OK))
348 if (readlink(linkname, filename, size - 1) < 0)
351 if (unlink(linkname))
355 * Since the link is relative, we must make it absolute:
357 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
358 debugdir, sbuild_id, filename);
360 if (unlink(linkname))
370 static int dso__cache_build_id(struct dso *dso, struct machine *machine,
371 const char *debugdir)
373 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
374 bool is_vdso = dso__is_vdso(dso);
375 const char *name = dso->long_name;
378 if (dso__is_kcore(dso)) {
380 machine__mmap_name(machine, nm, sizeof(nm));
383 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
384 debugdir, is_kallsyms, is_vdso);
387 static int __dsos__cache_build_ids(struct list_head *head,
388 struct machine *machine, const char *debugdir)
393 dsos__for_each_with_build_id(pos, head)
394 if (dso__cache_build_id(pos, machine, debugdir))
400 static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
402 int ret = __dsos__cache_build_ids(&machine->kernel_dsos.head, machine,
404 ret |= __dsos__cache_build_ids(&machine->user_dsos.head, machine,
409 int perf_session__cache_build_ids(struct perf_session *session)
413 char debugdir[PATH_MAX];
415 if (no_buildid_cache)
418 snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
420 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
423 ret = machine__cache_build_ids(&session->machines.host, debugdir);
425 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
426 struct machine *pos = rb_entry(nd, struct machine, rb_node);
427 ret |= machine__cache_build_ids(pos, debugdir);
432 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
436 ret = __dsos__read_build_ids(&machine->kernel_dsos.head, with_hits);
437 ret |= __dsos__read_build_ids(&machine->user_dsos.head, with_hits);
441 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
444 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
446 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
447 struct machine *pos = rb_entry(nd, struct machine, rb_node);
448 ret |= machine__read_build_ids(pos, with_hits);