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 char *build_id_cache__kallsyms_path(const char *sbuild_id
, char *bf
,
150 bool retry_old
= true;
152 snprintf(bf
, size
, "%s/%s/%s/kallsyms",
153 buildid_dir
, DSO__NAME_KALLSYMS
, sbuild_id
);
155 if (!access(bf
, F_OK
))
158 /* Try old style kallsyms cache */
159 snprintf(bf
, size
, "%s/%s/%s",
160 buildid_dir
, DSO__NAME_KALLSYMS
, sbuild_id
);
168 static char *build_id_cache__linkname(const char *sbuild_id
, char *bf
,
172 int ret
= asnprintf(&bf
, size
, "%s/.build-id/%.2s/%s", buildid_dir
,
173 sbuild_id
, sbuild_id
+ 2);
174 if (ret
< 0 || (tmp
&& size
< (unsigned int)ret
))
179 static const char *build_id_cache__basename(bool is_kallsyms
, bool is_vdso
)
181 return is_kallsyms
? "kallsyms" : (is_vdso
? "vdso" : "elf");
184 char *dso__build_id_filename(const struct dso
*dso
, char *bf
, size_t size
)
186 bool is_kallsyms
= dso__is_kallsyms((struct dso
*)dso
);
187 bool is_vdso
= dso__is_vdso((struct dso
*)dso
);
188 char sbuild_id
[SBUILD_ID_SIZE
];
190 bool alloc
= (bf
== NULL
);
193 if (!dso
->has_build_id
)
196 build_id__sprintf(dso
->build_id
, sizeof(dso
->build_id
), sbuild_id
);
197 linkname
= build_id_cache__linkname(sbuild_id
, NULL
, 0);
201 /* Check if old style build_id cache */
202 if (is_regular_file(linkname
))
203 ret
= asnprintf(&bf
, size
, "%s", linkname
);
205 ret
= asnprintf(&bf
, size
, "%s/%s", linkname
,
206 build_id_cache__basename(is_kallsyms
, is_vdso
));
207 if (ret
< 0 || (!alloc
&& size
< (unsigned int)ret
))
214 bool dso__build_id_is_kmod(const struct dso
*dso
, char *bf
, size_t size
)
216 char *id_name
= NULL
, *ch
;
218 char sbuild_id
[SBUILD_ID_SIZE
];
220 if (!dso
->has_build_id
)
223 build_id__sprintf(dso
->build_id
, sizeof(dso
->build_id
), sbuild_id
);
224 id_name
= build_id_cache__linkname(sbuild_id
, NULL
, 0);
227 if (access(id_name
, F_OK
))
229 if (lstat(id_name
, &sb
) == -1)
231 if ((size_t)sb
.st_size
> size
- 1)
233 if (readlink(id_name
, bf
, size
- 1) < 0)
236 bf
[sb
.st_size
] = '\0';
240 * ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92
242 ch
= strrchr(bf
, '/');
249 return strncmp(".ko", ch
- 3, 3) == 0;
251 pr_err("Invalid build id: %s\n", id_name
? :
259 #define dsos__for_each_with_build_id(pos, head) \
260 list_for_each_entry(pos, head, node) \
261 if (!pos->has_build_id) \
265 static int write_buildid(const char *name
, size_t name_len
, u8
*build_id
,
266 pid_t pid
, u16 misc
, int fd
)
269 struct build_id_event b
;
273 len
= PERF_ALIGN(len
, NAME_ALIGN
);
275 memset(&b
, 0, sizeof(b
));
276 memcpy(&b
.build_id
, build_id
, BUILD_ID_SIZE
);
278 b
.header
.misc
= misc
;
279 b
.header
.size
= sizeof(b
) + len
;
281 err
= writen(fd
, &b
, sizeof(b
));
285 return write_padded(fd
, name
, name_len
+ 1, len
);
288 static int machine__write_buildid_table(struct machine
*machine
, int fd
)
293 u16 kmisc
= PERF_RECORD_MISC_KERNEL
,
294 umisc
= PERF_RECORD_MISC_USER
;
296 if (!machine__is_host(machine
)) {
297 kmisc
= PERF_RECORD_MISC_GUEST_KERNEL
;
298 umisc
= PERF_RECORD_MISC_GUEST_USER
;
301 dsos__for_each_with_build_id(pos
, &machine
->dsos
.head
) {
304 bool in_kernel
= false;
306 if (!pos
->hit
&& !dso__is_vdso(pos
))
309 if (dso__is_vdso(pos
)) {
310 name
= pos
->short_name
;
311 name_len
= pos
->short_name_len
;
312 } else if (dso__is_kcore(pos
)) {
313 machine__mmap_name(machine
, nm
, sizeof(nm
));
315 name_len
= strlen(nm
);
317 name
= pos
->long_name
;
318 name_len
= pos
->long_name_len
;
321 in_kernel
= pos
->kernel
||
322 is_kernel_module(name
,
323 PERF_RECORD_MISC_CPUMODE_UNKNOWN
);
324 err
= write_buildid(name
, name_len
, pos
->build_id
, machine
->pid
,
325 in_kernel
? kmisc
: umisc
, fd
);
333 int perf_session__write_buildid_table(struct perf_session
*session
, int fd
)
336 int err
= machine__write_buildid_table(&session
->machines
.host
, fd
);
341 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
342 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
343 err
= machine__write_buildid_table(pos
, fd
);
350 static int __dsos__hit_all(struct list_head
*head
)
354 list_for_each_entry(pos
, head
, node
)
360 static int machine__hit_all_dsos(struct machine
*machine
)
362 return __dsos__hit_all(&machine
->dsos
.head
);
365 int dsos__hit_all(struct perf_session
*session
)
370 err
= machine__hit_all_dsos(&session
->machines
.host
);
374 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
375 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
377 err
= machine__hit_all_dsos(pos
);
385 void disable_buildid_cache(void)
387 no_buildid_cache
= true;
390 char *build_id_cache__cachedir(const char *sbuild_id
, const char *name
,
391 bool is_kallsyms
, bool is_vdso
)
393 char *realname
= (char *)name
, *filename
;
394 bool slash
= is_kallsyms
|| is_vdso
;
397 realname
= realpath(name
, NULL
);
402 if (asprintf(&filename
, "%s%s%s%s%s", buildid_dir
, slash
? "/" : "",
403 is_vdso
? DSO__NAME_VDSO
: realname
,
404 sbuild_id
? "/" : "", sbuild_id
?: "") < 0)
413 int build_id_cache__list_build_ids(const char *pathname
,
414 struct strlist
**result
)
419 dir_name
= build_id_cache__cachedir(NULL
, pathname
, false, false);
423 *result
= lsdir(dir_name
, lsdir_no_dot_filter
);
431 int build_id_cache__add_s(const char *sbuild_id
, const char *name
,
432 bool is_kallsyms
, bool is_vdso
)
434 const size_t size
= PATH_MAX
;
435 char *realname
= NULL
, *filename
= NULL
, *dir_name
= NULL
,
436 *linkname
= zalloc(size
), *tmp
;
440 realname
= realpath(name
, NULL
);
445 dir_name
= build_id_cache__cachedir(sbuild_id
, name
,
446 is_kallsyms
, is_vdso
);
450 /* Remove old style build-id cache */
451 if (is_regular_file(dir_name
))
452 if (unlink(dir_name
))
455 if (mkdir_p(dir_name
, 0755))
458 /* Save the allocated buildid dirname */
459 if (asprintf(&filename
, "%s/%s", dir_name
,
460 build_id_cache__basename(is_kallsyms
, is_vdso
)) < 0) {
465 if (access(filename
, F_OK
)) {
467 if (copyfile("/proc/kallsyms", filename
))
469 } else if (link(realname
, filename
) && errno
!= EEXIST
&&
470 copyfile(name
, filename
))
474 if (!build_id_cache__linkname(sbuild_id
, linkname
, size
))
476 tmp
= strrchr(linkname
, '/');
479 if (access(linkname
, X_OK
) && mkdir_p(linkname
, 0755))
483 tmp
= dir_name
+ strlen(buildid_dir
) - 5;
484 memcpy(tmp
, "../..", 5);
486 if (symlink(tmp
, linkname
) == 0)
497 static int build_id_cache__add_b(const u8
*build_id
, size_t build_id_size
,
498 const char *name
, bool is_kallsyms
,
501 char sbuild_id
[SBUILD_ID_SIZE
];
503 build_id__sprintf(build_id
, build_id_size
, sbuild_id
);
505 return build_id_cache__add_s(sbuild_id
, name
, is_kallsyms
, is_vdso
);
508 bool build_id_cache__cached(const char *sbuild_id
)
511 char *filename
= build_id_cache__linkname(sbuild_id
, NULL
, 0);
513 if (filename
&& !access(filename
, F_OK
))
520 int build_id_cache__remove_s(const char *sbuild_id
)
522 const size_t size
= PATH_MAX
;
523 char *filename
= zalloc(size
),
524 *linkname
= zalloc(size
), *tmp
;
527 if (filename
== NULL
|| linkname
== NULL
)
530 if (!build_id_cache__linkname(sbuild_id
, linkname
, size
))
533 if (access(linkname
, F_OK
))
536 if (readlink(linkname
, filename
, size
- 1) < 0)
539 if (unlink(linkname
))
543 * Since the link is relative, we must make it absolute:
545 tmp
= strrchr(linkname
, '/') + 1;
546 snprintf(tmp
, size
- (tmp
- linkname
), "%s", filename
);
558 static int dso__cache_build_id(struct dso
*dso
, struct machine
*machine
)
560 bool is_kallsyms
= dso__is_kallsyms(dso
);
561 bool is_vdso
= dso__is_vdso(dso
);
562 const char *name
= dso
->long_name
;
565 if (dso__is_kcore(dso
)) {
567 machine__mmap_name(machine
, nm
, sizeof(nm
));
570 return build_id_cache__add_b(dso
->build_id
, sizeof(dso
->build_id
), name
,
571 is_kallsyms
, is_vdso
);
574 static int __dsos__cache_build_ids(struct list_head
*head
,
575 struct machine
*machine
)
580 dsos__for_each_with_build_id(pos
, head
)
581 if (dso__cache_build_id(pos
, machine
))
587 static int machine__cache_build_ids(struct machine
*machine
)
589 return __dsos__cache_build_ids(&machine
->dsos
.head
, machine
);
592 int perf_session__cache_build_ids(struct perf_session
*session
)
597 if (no_buildid_cache
)
600 if (mkdir(buildid_dir
, 0755) != 0 && errno
!= EEXIST
)
603 ret
= machine__cache_build_ids(&session
->machines
.host
);
605 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
606 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
607 ret
|= machine__cache_build_ids(pos
);
612 static bool machine__read_build_ids(struct machine
*machine
, bool with_hits
)
614 return __dsos__read_build_ids(&machine
->dsos
.head
, with_hits
);
617 bool perf_session__read_build_ids(struct perf_session
*session
, bool with_hits
)
620 bool ret
= machine__read_build_ids(&session
->machines
.host
, with_hits
);
622 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
623 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
624 ret
|= machine__read_build_ids(pos
, with_hits
);