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Merge tag 'block-5.9-2020-08-14' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / tools / perf / util / dso.c
blob5a3b4755f0b3aea0997032b43c8176f351c8721a
1 // SPDX-License-Identifier: GPL-2.0
2 #include <asm/bug.h>
3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/zalloc.h>
6 #include <sys/time.h>
7 #include <sys/resource.h>
8 #include <sys/types.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <errno.h>
12 #include <fcntl.h>
13 #include <stdlib.h>
14 #include <bpf/libbpf.h>
15 #include "bpf-event.h"
16 #include "compress.h"
17 #include "env.h"
18 #include "namespaces.h"
19 #include "path.h"
20 #include "map.h"
21 #include "symbol.h"
22 #include "srcline.h"
23 #include "dso.h"
24 #include "dsos.h"
25 #include "machine.h"
26 #include "auxtrace.h"
27 #include "util.h" /* O_CLOEXEC for older systems */
28 #include "debug.h"
29 #include "string2.h"
30 #include "vdso.h"
31
32 static const char * const debuglink_paths[] = {
33 "%.0s%s",
34 "%s/%s",
35 "%s/.debug/%s",
36 "/usr/lib/debug%s/%s"
37 };
38
39 char dso__symtab_origin(const struct dso *dso)
40 {
41 static const char origin[] = {
42 [DSO_BINARY_TYPE__KALLSYMS] = 'k',
43 [DSO_BINARY_TYPE__VMLINUX] = 'v',
44 [DSO_BINARY_TYPE__JAVA_JIT] = 'j',
45 [DSO_BINARY_TYPE__DEBUGLINK] = 'l',
46 [DSO_BINARY_TYPE__BUILD_ID_CACHE] = 'B',
47 [DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO] = 'D',
48 [DSO_BINARY_TYPE__FEDORA_DEBUGINFO] = 'f',
49 [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO] = 'u',
50 [DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO] = 'x',
51 [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO] = 'o',
52 [DSO_BINARY_TYPE__BUILDID_DEBUGINFO] = 'b',
53 [DSO_BINARY_TYPE__SYSTEM_PATH_DSO] = 'd',
54 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE] = 'K',
55 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP] = 'm',
56 [DSO_BINARY_TYPE__GUEST_KALLSYMS] = 'g',
57 [DSO_BINARY_TYPE__GUEST_KMODULE] = 'G',
58 [DSO_BINARY_TYPE__GUEST_KMODULE_COMP] = 'M',
59 [DSO_BINARY_TYPE__GUEST_VMLINUX] = 'V',
60 };
61
62 if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
63 return '!';
64 return origin[dso->symtab_type];
65 }
66
67 int dso__read_binary_type_filename(const struct dso *dso,
68 enum dso_binary_type type,
69 char *root_dir, char *filename, size_t size)
70 {
71 char build_id_hex[SBUILD_ID_SIZE];
72 int ret = 0;
73 size_t len;
74
75 switch (type) {
76 case DSO_BINARY_TYPE__DEBUGLINK:
77 {
78 const char *last_slash;
79 char dso_dir[PATH_MAX];
80 char symfile[PATH_MAX];
81 unsigned int i;
82
83 len = __symbol__join_symfs(filename, size, dso->long_name);
84 last_slash = filename + len;
85 while (last_slash != filename && *last_slash != '/')
86 last_slash--;
87
88 strncpy(dso_dir, filename, last_slash - filename);
89 dso_dir[last_slash-filename] = '\0';
90
91 if (!is_regular_file(filename)) {
92 ret = -1;
93 break;
94 }
95
96 ret = filename__read_debuglink(filename, symfile, PATH_MAX);
97 if (ret)
98 break;
99
100 /* Check predefined locations where debug file might reside */
101 ret = -1;
102 for (i = 0; i < ARRAY_SIZE(debuglink_paths); i++) {
103 snprintf(filename, size,
104 debuglink_paths[i], dso_dir, symfile);
105 if (is_regular_file(filename)) {
106 ret = 0;
107 break;
108 }
109 }
110
111 break;
112 }
113 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
114 if (dso__build_id_filename(dso, filename, size, false) == NULL)
115 ret = -1;
116 break;
117
118 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
119 if (dso__build_id_filename(dso, filename, size, true) == NULL)
120 ret = -1;
121 break;
122
123 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
124 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
125 snprintf(filename + len, size - len, "%s.debug", dso->long_name);
126 break;
127
128 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
129 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
130 snprintf(filename + len, size - len, "%s", dso->long_name);
131 break;
132
133 case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
134 /*
135 * Ubuntu can mixup /usr/lib with /lib, putting debuginfo in
136 * /usr/lib/debug/lib when it is expected to be in
137 * /usr/lib/debug/usr/lib
138 */
139 if (strlen(dso->long_name) < 9 ||
140 strncmp(dso->long_name, "/usr/lib/", 9)) {
141 ret = -1;
142 break;
143 }
144 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
145 snprintf(filename + len, size - len, "%s", dso->long_name + 4);
146 break;
147
148 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
149 {
150 const char *last_slash;
151 size_t dir_size;
152
153 last_slash = dso->long_name + dso->long_name_len;
154 while (last_slash != dso->long_name && *last_slash != '/')
155 last_slash--;
156
157 len = __symbol__join_symfs(filename, size, "");
158 dir_size = last_slash - dso->long_name + 2;
159 if (dir_size > (size - len)) {
160 ret = -1;
161 break;
162 }
163 len += scnprintf(filename + len, dir_size, "%s", dso->long_name);
164 len += scnprintf(filename + len , size - len, ".debug%s",
165 last_slash);
166 break;
167 }
168
169 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
170 if (!dso->has_build_id) {
171 ret = -1;
172 break;
173 }
174
175 build_id__sprintf(dso->build_id,
176 sizeof(dso->build_id),
177 build_id_hex);
178 len = __symbol__join_symfs(filename, size, "/usr/lib/debug/.build-id/");
179 snprintf(filename + len, size - len, "%.2s/%s.debug",
180 build_id_hex, build_id_hex + 2);
181 break;
182
183 case DSO_BINARY_TYPE__VMLINUX:
184 case DSO_BINARY_TYPE__GUEST_VMLINUX:
185 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
186 __symbol__join_symfs(filename, size, dso->long_name);
187 break;
188
189 case DSO_BINARY_TYPE__GUEST_KMODULE:
190 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
191 path__join3(filename, size, symbol_conf.symfs,
192 root_dir, dso->long_name);
193 break;
194
195 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
196 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
197 __symbol__join_symfs(filename, size, dso->long_name);
198 break;
199
200 case DSO_BINARY_TYPE__KCORE:
201 case DSO_BINARY_TYPE__GUEST_KCORE:
202 snprintf(filename, size, "%s", dso->long_name);
203 break;
204
205 default:
206 case DSO_BINARY_TYPE__KALLSYMS:
207 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
208 case DSO_BINARY_TYPE__JAVA_JIT:
209 case DSO_BINARY_TYPE__BPF_PROG_INFO:
210 case DSO_BINARY_TYPE__BPF_IMAGE:
211 case DSO_BINARY_TYPE__OOL:
212 case DSO_BINARY_TYPE__NOT_FOUND:
213 ret = -1;
214 break;
215 }
216
217 return ret;
218 }
219
220 enum {
221 COMP_ID__NONE = 0,
222 };
223
224 static const struct {
225 const char *fmt;
226 int (*decompress)(const char *input, int output);
227 bool (*is_compressed)(const char *input);
228 } compressions[] = {
229 [COMP_ID__NONE] = { .fmt = NULL, },
230 #ifdef HAVE_ZLIB_SUPPORT
231 { "gz", gzip_decompress_to_file, gzip_is_compressed },
232 #endif
233 #ifdef HAVE_LZMA_SUPPORT
234 { "xz", lzma_decompress_to_file, lzma_is_compressed },
235 #endif
236 { NULL, NULL, NULL },
237 };
238
239 static int is_supported_compression(const char *ext)
240 {
241 unsigned i;
242
243 for (i = 1; compressions[i].fmt; i++) {
244 if (!strcmp(ext, compressions[i].fmt))
245 return i;
246 }
247 return COMP_ID__NONE;
248 }
249
250 bool is_kernel_module(const char *pathname, int cpumode)
251 {
252 struct kmod_path m;
253 int mode = cpumode & PERF_RECORD_MISC_CPUMODE_MASK;
254
255 WARN_ONCE(mode != cpumode,
256 "Internal error: passing unmasked cpumode (%x) to is_kernel_module",
257 cpumode);
258
259 switch (mode) {
260 case PERF_RECORD_MISC_USER:
261 case PERF_RECORD_MISC_HYPERVISOR:
262 case PERF_RECORD_MISC_GUEST_USER:
263 return false;
264 /* Treat PERF_RECORD_MISC_CPUMODE_UNKNOWN as kernel */
265 default:
266 if (kmod_path__parse(&m, pathname)) {
267 pr_err("Failed to check whether %s is a kernel module or not. Assume it is.",
268 pathname);
269 return true;
270 }
271 }
272
273 return m.kmod;
274 }
275
276 bool dso__needs_decompress(struct dso *dso)
277 {
278 return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
279 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
280 }
281
282 static int decompress_kmodule(struct dso *dso, const char *name,
283 char *pathname, size_t len)
284 {
285 char tmpbuf[] = KMOD_DECOMP_NAME;
286 int fd = -1;
287
288 if (!dso__needs_decompress(dso))
289 return -1;
290
291 if (dso->comp == COMP_ID__NONE)
292 return -1;
293
294 /*
295 * We have proper compression id for DSO and yet the file
296 * behind the 'name' can still be plain uncompressed object.
297 *
298 * The reason is behind the logic we open the DSO object files,
299 * when we try all possible 'debug' objects until we find the
300 * data. So even if the DSO is represented by 'krava.xz' module,
301 * we can end up here opening ~/.debug/....23432432/debug' file
302 * which is not compressed.
303 *
304 * To keep this transparent, we detect this and return the file
305 * descriptor to the uncompressed file.
306 */
307 if (!compressions[dso->comp].is_compressed(name))
308 return open(name, O_RDONLY);
309
310 fd = mkstemp(tmpbuf);
311 if (fd < 0) {
312 dso->load_errno = errno;
313 return -1;
314 }
315
316 if (compressions[dso->comp].decompress(name, fd)) {
317 dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
318 close(fd);
319 fd = -1;
320 }
321
322 if (!pathname || (fd < 0))
323 unlink(tmpbuf);
324
325 if (pathname && (fd >= 0))
326 strlcpy(pathname, tmpbuf, len);
327
328 return fd;
329 }
330
331 int dso__decompress_kmodule_fd(struct dso *dso, const char *name)
332 {
333 return decompress_kmodule(dso, name, NULL, 0);
334 }
335
336 int dso__decompress_kmodule_path(struct dso *dso, const char *name,
337 char *pathname, size_t len)
338 {
339 int fd = decompress_kmodule(dso, name, pathname, len);
340
341 close(fd);
342 return fd >= 0 ? 0 : -1;
343 }
344
345 /*
346 * Parses kernel module specified in @path and updates
347 * @m argument like:
348 *
349 * @comp - true if @path contains supported compression suffix,
350 * false otherwise
351 * @kmod - true if @path contains '.ko' suffix in right position,
352 * false otherwise
353 * @name - if (@alloc_name && @kmod) is true, it contains strdup-ed base name
354 * of the kernel module without suffixes, otherwise strudup-ed
355 * base name of @path
356 * @ext - if (@alloc_ext && @comp) is true, it contains strdup-ed string
357 * the compression suffix
358 *
359 * Returns 0 if there's no strdup error, -ENOMEM otherwise.
360 */
361 int __kmod_path__parse(struct kmod_path *m, const char *path,
362 bool alloc_name)
363 {
364 const char *name = strrchr(path, '/');
365 const char *ext = strrchr(path, '.');
366 bool is_simple_name = false;
367
368 memset(m, 0x0, sizeof(*m));
369 name = name ? name + 1 : path;
370
371 /*
372 * '.' is also a valid character for module name. For example:
373 * [aaa.bbb] is a valid module name. '[' should have higher
374 * priority than '.ko' suffix.
375 *
376 * The kernel names are from machine__mmap_name. Such
377 * name should belong to kernel itself, not kernel module.
378 */
379 if (name[0] == '[') {
380 is_simple_name = true;
381 if ((strncmp(name, "[kernel.kallsyms]", 17) == 0) ||
382 (strncmp(name, "[guest.kernel.kallsyms", 22) == 0) ||
383 (strncmp(name, "[vdso]", 6) == 0) ||
384 (strncmp(name, "[vdso32]", 8) == 0) ||
385 (strncmp(name, "[vdsox32]", 9) == 0) ||
386 (strncmp(name, "[vsyscall]", 10) == 0)) {
387 m->kmod = false;
388
389 } else
390 m->kmod = true;
391 }
392
393 /* No extension, just return name. */
394 if ((ext == NULL) || is_simple_name) {
395 if (alloc_name) {
396 m->name = strdup(name);
397 return m->name ? 0 : -ENOMEM;
398 }
399 return 0;
400 }
401
402 m->comp = is_supported_compression(ext + 1);
403 if (m->comp > COMP_ID__NONE)
404 ext -= 3;
405
406 /* Check .ko extension only if there's enough name left. */
407 if (ext > name)
408 m->kmod = !strncmp(ext, ".ko", 3);
409
410 if (alloc_name) {
411 if (m->kmod) {
412 if (asprintf(&m->name, "[%.*s]", (int) (ext - name), name) == -1)
413 return -ENOMEM;
414 } else {
415 if (asprintf(&m->name, "%s", name) == -1)
416 return -ENOMEM;
417 }
418
419 strreplace(m->name, '-', '_');
420 }
421
422 return 0;
423 }
424
425 void dso__set_module_info(struct dso *dso, struct kmod_path *m,
426 struct machine *machine)
427 {
428 if (machine__is_host(machine))
429 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
430 else
431 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
432
433 /* _KMODULE_COMP should be next to _KMODULE */
434 if (m->kmod && m->comp) {
435 dso->symtab_type++;
436 dso->comp = m->comp;
437 }
438
439 dso__set_short_name(dso, strdup(m->name), true);
440 }
441
442 /*
443 * Global list of open DSOs and the counter.
444 */
445 static LIST_HEAD(dso__data_open);
446 static long dso__data_open_cnt;
447 static pthread_mutex_t dso__data_open_lock = PTHREAD_MUTEX_INITIALIZER;
448
449 static void dso__list_add(struct dso *dso)
450 {
451 list_add_tail(&dso->data.open_entry, &dso__data_open);
452 dso__data_open_cnt++;
453 }
454
455 static void dso__list_del(struct dso *dso)
456 {
457 list_del_init(&dso->data.open_entry);
458 WARN_ONCE(dso__data_open_cnt <= 0,
459 "DSO data fd counter out of bounds.");
460 dso__data_open_cnt--;
461 }
462
463 static void close_first_dso(void);
464
465 static int do_open(char *name)
466 {
467 int fd;
468 char sbuf[STRERR_BUFSIZE];
469
470 do {
471 fd = open(name, O_RDONLY|O_CLOEXEC);
472 if (fd >= 0)
473 return fd;
474
475 pr_debug("dso open failed: %s\n",
476 str_error_r(errno, sbuf, sizeof(sbuf)));
477 if (!dso__data_open_cnt || errno != EMFILE)
478 break;
479
480 close_first_dso();
481 } while (1);
482
483 return -1;
484 }
485
486 static int __open_dso(struct dso *dso, struct machine *machine)
487 {
488 int fd = -EINVAL;
489 char *root_dir = (char *)"";
490 char *name = malloc(PATH_MAX);
491 bool decomp = false;
492
493 if (!name)
494 return -ENOMEM;
495
496 if (machine)
497 root_dir = machine->root_dir;
498
499 if (dso__read_binary_type_filename(dso, dso->binary_type,
500 root_dir, name, PATH_MAX))
501 goto out;
502
503 if (!is_regular_file(name))
504 goto out;
505
506 if (dso__needs_decompress(dso)) {
507 char newpath[KMOD_DECOMP_LEN];
508 size_t len = sizeof(newpath);
509
510 if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
511 fd = -dso->load_errno;
512 goto out;
513 }
514
515 decomp = true;
516 strcpy(name, newpath);
517 }
518
519 fd = do_open(name);
520
521 if (decomp)
522 unlink(name);
523
524 out:
525 free(name);
526 return fd;
527 }
528
529 static void check_data_close(void);
530
531 /**
532 * dso_close - Open DSO data file
533 * @dso: dso object
534 *
535 * Open @dso's data file descriptor and updates
536 * list/count of open DSO objects.
537 */
538 static int open_dso(struct dso *dso, struct machine *machine)
539 {
540 int fd;
541 struct nscookie nsc;
542
543 if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
544 nsinfo__mountns_enter(dso->nsinfo, &nsc);
545 fd = __open_dso(dso, machine);
546 if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
547 nsinfo__mountns_exit(&nsc);
548
549 if (fd >= 0) {
550 dso__list_add(dso);
551 /*
552 * Check if we crossed the allowed number
553 * of opened DSOs and close one if needed.
554 */
555 check_data_close();
556 }
557
558 return fd;
559 }
560
561 static void close_data_fd(struct dso *dso)
562 {
563 if (dso->data.fd >= 0) {
564 close(dso->data.fd);
565 dso->data.fd = -1;
566 dso->data.file_size = 0;
567 dso__list_del(dso);
568 }
569 }
570
571 /**
572 * dso_close - Close DSO data file
573 * @dso: dso object
574 *
575 * Close @dso's data file descriptor and updates
576 * list/count of open DSO objects.
577 */
578 static void close_dso(struct dso *dso)
579 {
580 close_data_fd(dso);
581 }
582
583 static void close_first_dso(void)
584 {
585 struct dso *dso;
586
587 dso = list_first_entry(&dso__data_open, struct dso, data.open_entry);
588 close_dso(dso);
589 }
590
591 static rlim_t get_fd_limit(void)
592 {
593 struct rlimit l;
594 rlim_t limit = 0;
595
596 /* Allow half of the current open fd limit. */
597 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
598 if (l.rlim_cur == RLIM_INFINITY)
599 limit = l.rlim_cur;
600 else
601 limit = l.rlim_cur / 2;
602 } else {
603 pr_err("failed to get fd limit\n");
604 limit = 1;
605 }
606
607 return limit;
608 }
609
610 static rlim_t fd_limit;
611
612 /*
613 * Used only by tests/dso-data.c to reset the environment
614 * for tests. I dont expect we should change this during
615 * standard runtime.
616 */
617 void reset_fd_limit(void)
618 {
619 fd_limit = 0;
620 }
621
622 static bool may_cache_fd(void)
623 {
624 if (!fd_limit)
625 fd_limit = get_fd_limit();
626
627 if (fd_limit == RLIM_INFINITY)
628 return true;
629
630 return fd_limit > (rlim_t) dso__data_open_cnt;
631 }
632
633 /*
634 * Check and close LRU dso if we crossed allowed limit
635 * for opened dso file descriptors. The limit is half
636 * of the RLIMIT_NOFILE files opened.
637 */
638 static void check_data_close(void)
639 {
640 bool cache_fd = may_cache_fd();
641
642 if (!cache_fd)
643 close_first_dso();
644 }
645
646 /**
647 * dso__data_close - Close DSO data file
648 * @dso: dso object
649 *
650 * External interface to close @dso's data file descriptor.
651 */
652 void dso__data_close(struct dso *dso)
653 {
654 pthread_mutex_lock(&dso__data_open_lock);
655 close_dso(dso);
656 pthread_mutex_unlock(&dso__data_open_lock);
657 }
658
659 static void try_to_open_dso(struct dso *dso, struct machine *machine)
660 {
661 enum dso_binary_type binary_type_data[] = {
662 DSO_BINARY_TYPE__BUILD_ID_CACHE,
663 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
664 DSO_BINARY_TYPE__NOT_FOUND,
665 };
666 int i = 0;
667
668 if (dso->data.fd >= 0)
669 return;
670
671 if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) {
672 dso->data.fd = open_dso(dso, machine);
673 goto out;
674 }
675
676 do {
677 dso->binary_type = binary_type_data[i++];
678
679 dso->data.fd = open_dso(dso, machine);
680 if (dso->data.fd >= 0)
681 goto out;
682
683 } while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND);
684 out:
685 if (dso->data.fd >= 0)
686 dso->data.status = DSO_DATA_STATUS_OK;
687 else
688 dso->data.status = DSO_DATA_STATUS_ERROR;
689 }
690
691 /**
692 * dso__data_get_fd - Get dso's data file descriptor
693 * @dso: dso object
694 * @machine: machine object
695 *
696 * External interface to find dso's file, open it and
697 * returns file descriptor. It should be paired with
698 * dso__data_put_fd() if it returns non-negative value.
699 */
700 int dso__data_get_fd(struct dso *dso, struct machine *machine)
701 {
702 if (dso->data.status == DSO_DATA_STATUS_ERROR)
703 return -1;
704
705 if (pthread_mutex_lock(&dso__data_open_lock) < 0)
706 return -1;
707
708 try_to_open_dso(dso, machine);
709
710 if (dso->data.fd < 0)
711 pthread_mutex_unlock(&dso__data_open_lock);
712
713 return dso->data.fd;
714 }
715
716 void dso__data_put_fd(struct dso *dso __maybe_unused)
717 {
718 pthread_mutex_unlock(&dso__data_open_lock);
719 }
720
721 bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by)
722 {
723 u32 flag = 1 << by;
724
725 if (dso->data.status_seen & flag)
726 return true;
727
728 dso->data.status_seen |= flag;
729
730 return false;
731 }
732
733 static ssize_t bpf_read(struct dso *dso, u64 offset, char *data)
734 {
735 struct bpf_prog_info_node *node;
736 ssize_t size = DSO__DATA_CACHE_SIZE;
737 u64 len;
738 u8 *buf;
739
740 node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id);
741 if (!node || !node->info_linear) {
742 dso->data.status = DSO_DATA_STATUS_ERROR;
743 return -1;
744 }
745
746 len = node->info_linear->info.jited_prog_len;
747 buf = (u8 *)(uintptr_t)node->info_linear->info.jited_prog_insns;
748
749 if (offset >= len)
750 return -1;
751
752 size = (ssize_t)min(len - offset, (u64)size);
753 memcpy(data, buf + offset, size);
754 return size;
755 }
756
757 static int bpf_size(struct dso *dso)
758 {
759 struct bpf_prog_info_node *node;
760
761 node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id);
762 if (!node || !node->info_linear) {
763 dso->data.status = DSO_DATA_STATUS_ERROR;
764 return -1;
765 }
766
767 dso->data.file_size = node->info_linear->info.jited_prog_len;
768 return 0;
769 }
770
771 static void
772 dso_cache__free(struct dso *dso)
773 {
774 struct rb_root *root = &dso->data.cache;
775 struct rb_node *next = rb_first(root);
776
777 pthread_mutex_lock(&dso->lock);
778 while (next) {
779 struct dso_cache *cache;
780
781 cache = rb_entry(next, struct dso_cache, rb_node);
782 next = rb_next(&cache->rb_node);
783 rb_erase(&cache->rb_node, root);
784 free(cache);
785 }
786 pthread_mutex_unlock(&dso->lock);
787 }
788
789 static struct dso_cache *__dso_cache__find(struct dso *dso, u64 offset)
790 {
791 const struct rb_root *root = &dso->data.cache;
792 struct rb_node * const *p = &root->rb_node;
793 const struct rb_node *parent = NULL;
794 struct dso_cache *cache;
795
796 while (*p != NULL) {
797 u64 end;
798
799 parent = *p;
800 cache = rb_entry(parent, struct dso_cache, rb_node);
801 end = cache->offset + DSO__DATA_CACHE_SIZE;
802
803 if (offset < cache->offset)
804 p = &(*p)->rb_left;
805 else if (offset >= end)
806 p = &(*p)->rb_right;
807 else
808 return cache;
809 }
810
811 return NULL;
812 }
813
814 static struct dso_cache *
815 dso_cache__insert(struct dso *dso, struct dso_cache *new)
816 {
817 struct rb_root *root = &dso->data.cache;
818 struct rb_node **p = &root->rb_node;
819 struct rb_node *parent = NULL;
820 struct dso_cache *cache;
821 u64 offset = new->offset;
822
823 pthread_mutex_lock(&dso->lock);
824 while (*p != NULL) {
825 u64 end;
826
827 parent = *p;
828 cache = rb_entry(parent, struct dso_cache, rb_node);
829 end = cache->offset + DSO__DATA_CACHE_SIZE;
830
831 if (offset < cache->offset)
832 p = &(*p)->rb_left;
833 else if (offset >= end)
834 p = &(*p)->rb_right;
835 else
836 goto out;
837 }
838
839 rb_link_node(&new->rb_node, parent, p);
840 rb_insert_color(&new->rb_node, root);
841
842 cache = NULL;
843 out:
844 pthread_mutex_unlock(&dso->lock);
845 return cache;
846 }
847
848 static ssize_t dso_cache__memcpy(struct dso_cache *cache, u64 offset, u8 *data,
849 u64 size, bool out)
850 {
851 u64 cache_offset = offset - cache->offset;
852 u64 cache_size = min(cache->size - cache_offset, size);
853
854 if (out)
855 memcpy(data, cache->data + cache_offset, cache_size);
856 else
857 memcpy(cache->data + cache_offset, data, cache_size);
858 return cache_size;
859 }
860
861 static ssize_t file_read(struct dso *dso, struct machine *machine,
862 u64 offset, char *data)
863 {
864 ssize_t ret;
865
866 pthread_mutex_lock(&dso__data_open_lock);
867
868 /*
869 * dso->data.fd might be closed if other thread opened another
870 * file (dso) due to open file limit (RLIMIT_NOFILE).
871 */
872 try_to_open_dso(dso, machine);
873
874 if (dso->data.fd < 0) {
875 dso->data.status = DSO_DATA_STATUS_ERROR;
876 ret = -errno;
877 goto out;
878 }
879
880 ret = pread(dso->data.fd, data, DSO__DATA_CACHE_SIZE, offset);
881 out:
882 pthread_mutex_unlock(&dso__data_open_lock);
883 return ret;
884 }
885
886 static struct dso_cache *dso_cache__populate(struct dso *dso,
887 struct machine *machine,
888 u64 offset, ssize_t *ret)
889 {
890 u64 cache_offset = offset & DSO__DATA_CACHE_MASK;
891 struct dso_cache *cache;
892 struct dso_cache *old;
893
894 cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
895 if (!cache) {
896 *ret = -ENOMEM;
897 return NULL;
898 }
899
900 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
901 *ret = bpf_read(dso, cache_offset, cache->data);
902 else if (dso->binary_type == DSO_BINARY_TYPE__OOL)
903 *ret = DSO__DATA_CACHE_SIZE;
904 else
905 *ret = file_read(dso, machine, cache_offset, cache->data);
906
907 if (*ret <= 0) {
908 free(cache);
909 return NULL;
910 }
911
912 cache->offset = cache_offset;
913 cache->size = *ret;
914
915 old = dso_cache__insert(dso, cache);
916 if (old) {
917 /* we lose the race */
918 free(cache);
919 cache = old;
920 }
921
922 return cache;
923 }
924
925 static struct dso_cache *dso_cache__find(struct dso *dso,
926 struct machine *machine,
927 u64 offset,
928 ssize_t *ret)
929 {
930 struct dso_cache *cache = __dso_cache__find(dso, offset);
931
932 return cache ? cache : dso_cache__populate(dso, machine, offset, ret);
933 }
934
935 static ssize_t dso_cache_io(struct dso *dso, struct machine *machine,
936 u64 offset, u8 *data, ssize_t size, bool out)
937 {
938 struct dso_cache *cache;
939 ssize_t ret = 0;
940
941 cache = dso_cache__find(dso, machine, offset, &ret);
942 if (!cache)
943 return ret;
944
945 return dso_cache__memcpy(cache, offset, data, size, out);
946 }
947
948 /*
949 * Reads and caches dso data DSO__DATA_CACHE_SIZE size chunks
950 * in the rb_tree. Any read to already cached data is served
951 * by cached data. Writes update the cache only, not the backing file.
952 */
953 static ssize_t cached_io(struct dso *dso, struct machine *machine,
954 u64 offset, u8 *data, ssize_t size, bool out)
955 {
956 ssize_t r = 0;
957 u8 *p = data;
958
959 do {
960 ssize_t ret;
961
962 ret = dso_cache_io(dso, machine, offset, p, size, out);
963 if (ret < 0)
964 return ret;
965
966 /* Reached EOF, return what we have. */
967 if (!ret)
968 break;
969
970 BUG_ON(ret > size);
971
972 r += ret;
973 p += ret;
974 offset += ret;
975 size -= ret;
976
977 } while (size);
978
979 return r;
980 }
981
982 static int file_size(struct dso *dso, struct machine *machine)
983 {
984 int ret = 0;
985 struct stat st;
986 char sbuf[STRERR_BUFSIZE];
987
988 pthread_mutex_lock(&dso__data_open_lock);
989
990 /*
991 * dso->data.fd might be closed if other thread opened another
992 * file (dso) due to open file limit (RLIMIT_NOFILE).
993 */
994 try_to_open_dso(dso, machine);
995
996 if (dso->data.fd < 0) {
997 ret = -errno;
998 dso->data.status = DSO_DATA_STATUS_ERROR;
999 goto out;
1000 }
1001
1002 if (fstat(dso->data.fd, &st) < 0) {
1003 ret = -errno;
1004 pr_err("dso cache fstat failed: %s\n",
1005 str_error_r(errno, sbuf, sizeof(sbuf)));
1006 dso->data.status = DSO_DATA_STATUS_ERROR;
1007 goto out;
1008 }
1009 dso->data.file_size = st.st_size;
1010
1011 out:
1012 pthread_mutex_unlock(&dso__data_open_lock);
1013 return ret;
1014 }
1015
1016 int dso__data_file_size(struct dso *dso, struct machine *machine)
1017 {
1018 if (dso->data.file_size)
1019 return 0;
1020
1021 if (dso->data.status == DSO_DATA_STATUS_ERROR)
1022 return -1;
1023
1024 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
1025 return bpf_size(dso);
1026
1027 return file_size(dso, machine);
1028 }
1029
1030 /**
1031 * dso__data_size - Return dso data size
1032 * @dso: dso object
1033 * @machine: machine object
1034 *
1035 * Return: dso data size
1036 */
1037 off_t dso__data_size(struct dso *dso, struct machine *machine)
1038 {
1039 if (dso__data_file_size(dso, machine))
1040 return -1;
1041
1042 /* For now just estimate dso data size is close to file size */
1043 return dso->data.file_size;
1044 }
1045
1046 static ssize_t data_read_write_offset(struct dso *dso, struct machine *machine,
1047 u64 offset, u8 *data, ssize_t size,
1048 bool out)
1049 {
1050 if (dso__data_file_size(dso, machine))
1051 return -1;
1052
1053 /* Check the offset sanity. */
1054 if (offset > dso->data.file_size)
1055 return -1;
1056
1057 if (offset + size < offset)
1058 return -1;
1059
1060 return cached_io(dso, machine, offset, data, size, out);
1061 }
1062
1063 /**
1064 * dso__data_read_offset - Read data from dso file offset
1065 * @dso: dso object
1066 * @machine: machine object
1067 * @offset: file offset
1068 * @data: buffer to store data
1069 * @size: size of the @data buffer
1070 *
1071 * External interface to read data from dso file offset. Open
1072 * dso data file and use cached_read to get the data.
1073 */
1074 ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
1075 u64 offset, u8 *data, ssize_t size)
1076 {
1077 if (dso->data.status == DSO_DATA_STATUS_ERROR)
1078 return -1;
1079
1080 return data_read_write_offset(dso, machine, offset, data, size, true);
1081 }
1082
1083 /**
1084 * dso__data_read_addr - Read data from dso address
1085 * @dso: dso object
1086 * @machine: machine object
1087 * @add: virtual memory address
1088 * @data: buffer to store data
1089 * @size: size of the @data buffer
1090 *
1091 * External interface to read data from dso address.
1092 */
1093 ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
1094 struct machine *machine, u64 addr,
1095 u8 *data, ssize_t size)
1096 {
1097 u64 offset = map->map_ip(map, addr);
1098 return dso__data_read_offset(dso, machine, offset, data, size);
1099 }
1100
1101 /**
1102 * dso__data_write_cache_offs - Write data to dso data cache at file offset
1103 * @dso: dso object
1104 * @machine: machine object
1105 * @offset: file offset
1106 * @data: buffer to write
1107 * @size: size of the @data buffer
1108 *
1109 * Write into the dso file data cache, but do not change the file itself.
1110 */
1111 ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine,
1112 u64 offset, const u8 *data_in, ssize_t size)
1113 {
1114 u8 *data = (u8 *)data_in; /* cast away const to use same fns for r/w */
1115
1116 if (dso->data.status == DSO_DATA_STATUS_ERROR)
1117 return -1;
1118
1119 return data_read_write_offset(dso, machine, offset, data, size, false);
1120 }
1121
1122 /**
1123 * dso__data_write_cache_addr - Write data to dso data cache at dso address
1124 * @dso: dso object
1125 * @machine: machine object
1126 * @add: virtual memory address
1127 * @data: buffer to write
1128 * @size: size of the @data buffer
1129 *
1130 * External interface to write into the dso file data cache, but do not change
1131 * the file itself.
1132 */
1133 ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map,
1134 struct machine *machine, u64 addr,
1135 const u8 *data, ssize_t size)
1136 {
1137 u64 offset = map->map_ip(map, addr);
1138 return dso__data_write_cache_offs(dso, machine, offset, data, size);
1139 }
1140
1141 struct map *dso__new_map(const char *name)
1142 {
1143 struct map *map = NULL;
1144 struct dso *dso = dso__new(name);
1145
1146 if (dso)
1147 map = map__new2(0, dso);
1148
1149 return map;
1150 }
1151
1152 struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
1153 const char *short_name, int dso_type)
1154 {
1155 /*
1156 * The kernel dso could be created by build_id processing.
1157 */
1158 struct dso *dso = machine__findnew_dso(machine, name);
1159
1160 /*
1161 * We need to run this in all cases, since during the build_id
1162 * processing we had no idea this was the kernel dso.
1163 */
1164 if (dso != NULL) {
1165 dso__set_short_name(dso, short_name, false);
1166 dso->kernel = dso_type;
1167 }
1168
1169 return dso;
1170 }
1171
1172 static void dso__set_long_name_id(struct dso *dso, const char *name, struct dso_id *id, bool name_allocated)
1173 {
1174 struct rb_root *root = dso->root;
1175
1176 if (name == NULL)
1177 return;
1178
1179 if (dso->long_name_allocated)
1180 free((char *)dso->long_name);
1181
1182 if (root) {
1183 rb_erase(&dso->rb_node, root);
1184 /*
1185 * __dsos__findnew_link_by_longname_id() isn't guaranteed to
1186 * add it back, so a clean removal is required here.
1187 */
1188 RB_CLEAR_NODE(&dso->rb_node);
1189 dso->root = NULL;
1190 }
1191
1192 dso->long_name = name;
1193 dso->long_name_len = strlen(name);
1194 dso->long_name_allocated = name_allocated;
1195
1196 if (root)
1197 __dsos__findnew_link_by_longname_id(root, dso, NULL, id);
1198 }
1199
1200 void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated)
1201 {
1202 dso__set_long_name_id(dso, name, NULL, name_allocated);
1203 }
1204
1205 void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated)
1206 {
1207 if (name == NULL)
1208 return;
1209
1210 if (dso->short_name_allocated)
1211 free((char *)dso->short_name);
1212
1213 dso->short_name = name;
1214 dso->short_name_len = strlen(name);
1215 dso->short_name_allocated = name_allocated;
1216 }
1217
1218 int dso__name_len(const struct dso *dso)
1219 {
1220 if (!dso)
1221 return strlen("[unknown]");
1222 if (verbose > 0)
1223 return dso->long_name_len;
1224
1225 return dso->short_name_len;
1226 }
1227
1228 bool dso__loaded(const struct dso *dso)
1229 {
1230 return dso->loaded;
1231 }
1232
1233 bool dso__sorted_by_name(const struct dso *dso)
1234 {
1235 return dso->sorted_by_name;
1236 }
1237
1238 void dso__set_sorted_by_name(struct dso *dso)
1239 {
1240 dso->sorted_by_name = true;
1241 }
1242
1243 struct dso *dso__new_id(const char *name, struct dso_id *id)
1244 {
1245 struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
1246
1247 if (dso != NULL) {
1248 strcpy(dso->name, name);
1249 if (id)
1250 dso->id = *id;
1251 dso__set_long_name_id(dso, dso->name, id, false);
1252 dso__set_short_name(dso, dso->name, false);
1253 dso->symbols = dso->symbol_names = RB_ROOT_CACHED;
1254 dso->data.cache = RB_ROOT;
1255 dso->inlined_nodes = RB_ROOT_CACHED;
1256 dso->srclines = RB_ROOT_CACHED;
1257 dso->data.fd = -1;
1258 dso->data.status = DSO_DATA_STATUS_UNKNOWN;
1259 dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
1260 dso->binary_type = DSO_BINARY_TYPE__NOT_FOUND;
1261 dso->is_64_bit = (sizeof(void *) == 8);
1262 dso->loaded = 0;
1263 dso->rel = 0;
1264 dso->sorted_by_name = 0;
1265 dso->has_build_id = 0;
1266 dso->has_srcline = 1;
1267 dso->a2l_fails = 1;
1268 dso->kernel = DSO_SPACE__USER;
1269 dso->needs_swap = DSO_SWAP__UNSET;
1270 dso->comp = COMP_ID__NONE;
1271 RB_CLEAR_NODE(&dso->rb_node);
1272 dso->root = NULL;
1273 INIT_LIST_HEAD(&dso->node);
1274 INIT_LIST_HEAD(&dso->data.open_entry);
1275 pthread_mutex_init(&dso->lock, NULL);
1276 refcount_set(&dso->refcnt, 1);
1277 }
1278
1279 return dso;
1280 }
1281
1282 struct dso *dso__new(const char *name)
1283 {
1284 return dso__new_id(name, NULL);
1285 }
1286
1287 void dso__delete(struct dso *dso)
1288 {
1289 if (!RB_EMPTY_NODE(&dso->rb_node))
1290 pr_err("DSO %s is still in rbtree when being deleted!\n",
1291 dso->long_name);
1292
1293 /* free inlines first, as they reference symbols */
1294 inlines__tree_delete(&dso->inlined_nodes);
1295 srcline__tree_delete(&dso->srclines);
1296 symbols__delete(&dso->symbols);
1297
1298 if (dso->short_name_allocated) {
1299 zfree((char **)&dso->short_name);
1300 dso->short_name_allocated = false;
1301 }
1302
1303 if (dso->long_name_allocated) {
1304 zfree((char **)&dso->long_name);
1305 dso->long_name_allocated = false;
1306 }
1307
1308 dso__data_close(dso);
1309 auxtrace_cache__free(dso->auxtrace_cache);
1310 dso_cache__free(dso);
1311 dso__free_a2l(dso);
1312 zfree(&dso->symsrc_filename);
1313 nsinfo__zput(dso->nsinfo);
1314 pthread_mutex_destroy(&dso->lock);
1315 free(dso);
1316 }
1317
1318 struct dso *dso__get(struct dso *dso)
1319 {
1320 if (dso)
1321 refcount_inc(&dso->refcnt);
1322 return dso;
1323 }
1324
1325 void dso__put(struct dso *dso)
1326 {
1327 if (dso && refcount_dec_and_test(&dso->refcnt))
1328 dso__delete(dso);
1329 }
1330
1331 void dso__set_build_id(struct dso *dso, void *build_id)
1332 {
1333 memcpy(dso->build_id, build_id, sizeof(dso->build_id));
1334 dso->has_build_id = 1;
1335 }
1336
1337 bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1338 {
1339 return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1340 }
1341
1342 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
1343 {
1344 char path[PATH_MAX];
1345
1346 if (machine__is_default_guest(machine))
1347 return;
1348 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
1349 if (sysfs__read_build_id(path, dso->build_id,
1350 sizeof(dso->build_id)) == 0)
1351 dso->has_build_id = true;
1352 }
1353
1354 int dso__kernel_module_get_build_id(struct dso *dso,
1355 const char *root_dir)
1356 {
1357 char filename[PATH_MAX];
1358 /*
1359 * kernel module short names are of the form "[module]" and
1360 * we need just "module" here.
1361 */
1362 const char *name = dso->short_name + 1;
1363
1364 snprintf(filename, sizeof(filename),
1365 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1366 root_dir, (int)strlen(name) - 1, name);
1367
1368 if (sysfs__read_build_id(filename, dso->build_id,
1369 sizeof(dso->build_id)) == 0)
1370 dso->has_build_id = true;
1371
1372 return 0;
1373 }
1374
1375 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
1376 {
1377 char sbuild_id[SBUILD_ID_SIZE];
1378
1379 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1380 return fprintf(fp, "%s", sbuild_id);
1381 }
1382
1383 size_t dso__fprintf(struct dso *dso, FILE *fp)
1384 {
1385 struct rb_node *nd;
1386 size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
1387
1388 if (dso->short_name != dso->long_name)
1389 ret += fprintf(fp, "%s, ", dso->long_name);
1390 ret += fprintf(fp, "%sloaded, ", dso__loaded(dso) ? "" : "NOT ");
1391 ret += dso__fprintf_buildid(dso, fp);
1392 ret += fprintf(fp, ")\n");
1393 for (nd = rb_first_cached(&dso->symbols); nd; nd = rb_next(nd)) {
1394 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
1395 ret += symbol__fprintf(pos, fp);
1396 }
1397
1398 return ret;
1399 }
1400
1401 enum dso_type dso__type(struct dso *dso, struct machine *machine)
1402 {
1403 int fd;
1404 enum dso_type type = DSO__TYPE_UNKNOWN;
1405
1406 fd = dso__data_get_fd(dso, machine);
1407 if (fd >= 0) {
1408 type = dso__type_fd(fd);
1409 dso__data_put_fd(dso);
1410 }
1411
1412 return type;
1413 }
1414
1415 int dso__strerror_load(struct dso *dso, char *buf, size_t buflen)
1416 {
1417 int idx, errnum = dso->load_errno;
1418 /*
1419 * This must have a same ordering as the enum dso_load_errno.
1420 */
1421 static const char *dso_load__error_str[] = {
1422 "Internal tools/perf/ library error",
1423 "Invalid ELF file",
1424 "Can not read build id",
1425 "Mismatching build id",
1426 "Decompression failure",
1427 };
1428
1429 BUG_ON(buflen == 0);
1430
1431 if (errnum >= 0) {
1432 const char *err = str_error_r(errnum, buf, buflen);
1433
1434 if (err != buf)
1435 scnprintf(buf, buflen, "%s", err);
1436
1437 return 0;
1438 }
1439
1440 if (errnum < __DSO_LOAD_ERRNO__START || errnum >= __DSO_LOAD_ERRNO__END)
1441 return -1;
1442
1443 idx = errnum - __DSO_LOAD_ERRNO__START;
1444 scnprintf(buf, buflen, "%s", dso_load__error_str[idx]);
1445 return 0;
1446 }
Linux with added FPC-III support