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Linux/tools/perf/builtin-buildid-cache.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * builtin-buildid-cache.c
  4  *
  5  * Builtin buildid-cache command: Manages build-id cache
  6  *
  7  * Copyright (C) 2010, Red Hat Inc.
  8  * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
  9  */
 10 #include <sys/types.h>
 11 #include <sys/time.h>
 12 #include <time.h>
 13 #include <dirent.h>
 14 #include <errno.h>
 15 #include <unistd.h>
 16 #include "builtin.h"
 17 #include "namespaces.h"
 18 #include "util/debug.h"
 19 #include "util/header.h"
 20 #include <subcmd/pager.h>
 21 #include <subcmd/parse-options.h>
 22 #include "util/strlist.h"
 23 #include "util/build-id.h"
 24 #include "util/session.h"
 25 #include "util/dso.h"
 26 #include "util/symbol.h"
 27 #include "util/time-utils.h"
 28 #include "util/util.h"
 29 #include "util/probe-file.h"
 30 #include <linux/string.h>
 31 #include <linux/err.h>
 32 
 33 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
 34 {
 35         char root_dir[PATH_MAX];
 36         char *p;
 37 
 38         strlcpy(root_dir, proc_dir, sizeof(root_dir));
 39 
 40         p = strrchr(root_dir, '/');
 41         if (!p)
 42                 return -1;
 43         *p = '\0';
 44         return sysfs__sprintf_build_id(root_dir, sbuildid);
 45 }
 46 
 47 static int build_id_cache__kcore_dir(char *dir, size_t sz)
 48 {
 49         return fetch_current_timestamp(dir, sz);
 50 }
 51 
 52 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir)
 53 {
 54         char from[PATH_MAX];
 55         char to[PATH_MAX];
 56         const char *name;
 57         u64 addr1 = 0, addr2 = 0;
 58         int i, err = -1;
 59 
 60         scnprintf(from, sizeof(from), "%s/kallsyms", from_dir);
 61         scnprintf(to, sizeof(to), "%s/kallsyms", to_dir);
 62 
 63         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 64                 err = kallsyms__get_function_start(from, name, &addr1);
 65                 if (!err)
 66                         break;
 67         }
 68 
 69         if (err)
 70                 return false;
 71 
 72         if (kallsyms__get_function_start(to, name, &addr2))
 73                 return false;
 74 
 75         return addr1 == addr2;
 76 }
 77 
 78 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir,
 79                                           size_t to_dir_sz)
 80 {
 81         char from[PATH_MAX];
 82         char to[PATH_MAX];
 83         char to_subdir[PATH_MAX];
 84         struct dirent *dent;
 85         int ret = -1;
 86         DIR *d;
 87 
 88         d = opendir(to_dir);
 89         if (!d)
 90                 return -1;
 91 
 92         scnprintf(from, sizeof(from), "%s/modules", from_dir);
 93 
 94         while (1) {
 95                 dent = readdir(d);
 96                 if (!dent)
 97                         break;
 98                 if (dent->d_type != DT_DIR)
 99                         continue;
100                 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir,
101                           dent->d_name);
102                 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s",
103                           to_dir, dent->d_name);
104                 if (!compare_proc_modules(from, to) &&
105                     same_kallsyms_reloc(from_dir, to_subdir)) {
106                         strlcpy(to_dir, to_subdir, to_dir_sz);
107                         ret = 0;
108                         break;
109                 }
110         }
111 
112         closedir(d);
113 
114         return ret;
115 }
116 
117 static int build_id_cache__add_kcore(const char *filename, bool force)
118 {
119         char dir[32], sbuildid[SBUILD_ID_SIZE];
120         char from_dir[PATH_MAX], to_dir[PATH_MAX];
121         char *p;
122 
123         strlcpy(from_dir, filename, sizeof(from_dir));
124 
125         p = strrchr(from_dir, '/');
126         if (!p || strcmp(p + 1, "kcore"))
127                 return -1;
128         *p = '\0';
129 
130         if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0)
131                 return -1;
132 
133         scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s",
134                   buildid_dir, DSO__NAME_KCORE, sbuildid);
135 
136         if (!force &&
137             !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) {
138                 pr_debug("same kcore found in %s\n", to_dir);
139                 return 0;
140         }
141 
142         if (build_id_cache__kcore_dir(dir, sizeof(dir)))
143                 return -1;
144 
145         scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s",
146                   buildid_dir, DSO__NAME_KCORE, sbuildid, dir);
147 
148         if (mkdir_p(to_dir, 0755))
149                 return -1;
150 
151         if (kcore_copy(from_dir, to_dir)) {
152                 /* Remove YYYYmmddHHMMSShh directory */
153                 if (!rmdir(to_dir)) {
154                         p = strrchr(to_dir, '/');
155                         if (p)
156                                 *p = '\0';
157                         /* Try to remove buildid directory */
158                         if (!rmdir(to_dir)) {
159                                 p = strrchr(to_dir, '/');
160                                 if (p)
161                                         *p = '\0';
162                                 /* Try to remove [kernel.kcore] directory */
163                                 rmdir(to_dir);
164                         }
165                 }
166                 return -1;
167         }
168 
169         pr_debug("kcore added to build-id cache directory %s\n", to_dir);
170 
171         return 0;
172 }
173 
174 static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
175 {
176         char sbuild_id[SBUILD_ID_SIZE];
177         u8 build_id[BUILD_ID_SIZE];
178         int err;
179         struct nscookie nsc;
180 
181         nsinfo__mountns_enter(nsi, &nsc);
182         err = filename__read_build_id(filename, &build_id, sizeof(build_id));
183         nsinfo__mountns_exit(&nsc);
184         if (err < 0) {
185                 pr_debug("Couldn't read a build-id in %s\n", filename);
186                 return -1;
187         }
188 
189         build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
190         err = build_id_cache__add_s(sbuild_id, filename, nsi,
191                                     false, false);
192         pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
193                  err ? "FAIL" : "Ok");
194         return err;
195 }
196 
197 static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi)
198 {
199         u8 build_id[BUILD_ID_SIZE];
200         char sbuild_id[SBUILD_ID_SIZE];
201         struct nscookie nsc;
202 
203         int err;
204 
205         nsinfo__mountns_enter(nsi, &nsc);
206         err = filename__read_build_id(filename, &build_id, sizeof(build_id));
207         nsinfo__mountns_exit(&nsc);
208         if (err < 0) {
209                 pr_debug("Couldn't read a build-id in %s\n", filename);
210                 return -1;
211         }
212 
213         build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
214         err = build_id_cache__remove_s(sbuild_id);
215         pr_debug("Removing %s %s: %s\n", sbuild_id, filename,
216                  err ? "FAIL" : "Ok");
217 
218         return err;
219 }
220 
221 static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi)
222 {
223         struct strlist *list;
224         struct str_node *pos;
225         int err;
226 
227         err = build_id_cache__list_build_ids(pathname, nsi, &list);
228         if (err)
229                 goto out;
230 
231         strlist__for_each_entry(pos, list) {
232                 err = build_id_cache__remove_s(pos->s);
233                 pr_debug("Removing %s %s: %s\n", pos->s, pathname,
234                          err ? "FAIL" : "Ok");
235                 if (err)
236                         break;
237         }
238         strlist__delete(list);
239 
240 out:
241         pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");
242 
243         return err;
244 }
245 
246 static int build_id_cache__purge_all(void)
247 {
248         struct strlist *list;
249         struct str_node *pos;
250         int err = 0;
251         char *buf;
252 
253         list = build_id_cache__list_all(false);
254         if (!list) {
255                 pr_debug("Failed to get buildids: -%d\n", errno);
256                 return -EINVAL;
257         }
258 
259         strlist__for_each_entry(pos, list) {
260                 buf = build_id_cache__origname(pos->s);
261                 err = build_id_cache__remove_s(pos->s);
262                 pr_debug("Removing %s (%s): %s\n", buf, pos->s,
263                          err ? "FAIL" : "Ok");
264                 free(buf);
265                 if (err)
266                         break;
267         }
268         strlist__delete(list);
269 
270         pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok");
271         return err;
272 }
273 
274 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
275 {
276         char filename[PATH_MAX];
277         u8 build_id[BUILD_ID_SIZE];
278 
279         if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
280             filename__read_build_id(filename, build_id,
281                                     sizeof(build_id)) != sizeof(build_id)) {
282                 if (errno == ENOENT)
283                         return false;
284 
285                 pr_warning("Problems with %s file, consider removing it from the cache\n",
286                            filename);
287         } else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) {
288                 pr_warning("Problems with %s file, consider removing it from the cache\n",
289                            filename);
290         }
291 
292         return true;
293 }
294 
295 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp)
296 {
297         perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0);
298         return 0;
299 }
300 
301 static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
302 {
303         u8 build_id[BUILD_ID_SIZE];
304         char sbuild_id[SBUILD_ID_SIZE];
305         struct nscookie nsc;
306 
307         int err;
308 
309         nsinfo__mountns_enter(nsi, &nsc);
310         err = filename__read_build_id(filename, &build_id, sizeof(build_id));
311         nsinfo__mountns_exit(&nsc);
312         if (err < 0) {
313                 pr_debug("Couldn't read a build-id in %s\n", filename);
314                 return -1;
315         }
316         err = 0;
317 
318         build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
319         if (build_id_cache__cached(sbuild_id))
320                 err = build_id_cache__remove_s(sbuild_id);
321 
322         if (!err)
323                 err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
324                                             false);
325 
326         pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
327                  err ? "FAIL" : "Ok");
328 
329         return err;
330 }
331 
332 static int build_id_cache__show_all(void)
333 {
334         struct strlist *bidlist;
335         struct str_node *nd;
336         char *buf;
337 
338         bidlist = build_id_cache__list_all(true);
339         if (!bidlist) {
340                 pr_debug("Failed to get buildids: -%d\n", errno);
341                 return -1;
342         }
343         strlist__for_each_entry(nd, bidlist) {
344                 buf = build_id_cache__origname(nd->s);
345                 fprintf(stdout, "%s %s\n", nd->s, buf);
346                 free(buf);
347         }
348         strlist__delete(bidlist);
349         return 0;
350 }
351 
352 int cmd_buildid_cache(int argc, const char **argv)
353 {
354         struct strlist *list;
355         struct str_node *pos;
356         int ret = 0;
357         int ns_id = -1;
358         bool force = false;
359         bool list_files = false;
360         bool opts_flag = false;
361         bool purge_all = false;
362         char const *add_name_list_str = NULL,
363                    *remove_name_list_str = NULL,
364                    *purge_name_list_str = NULL,
365                    *missing_filename = NULL,
366                    *update_name_list_str = NULL,
367                    *kcore_filename = NULL;
368         char sbuf[STRERR_BUFSIZE];
369 
370         struct perf_data data = {
371                 .mode  = PERF_DATA_MODE_READ,
372         };
373         struct perf_session *session = NULL;
374         struct nsinfo *nsi = NULL;
375 
376         const struct option buildid_cache_options[] = {
377         OPT_STRING('a', "add", &add_name_list_str,
378                    "file list", "file(s) to add"),
379         OPT_STRING('k', "kcore", &kcore_filename,
380                    "file", "kcore file to add"),
381         OPT_STRING('r', "remove", &remove_name_list_str, "file list",
382                     "file(s) to remove"),
383         OPT_STRING('p', "purge", &purge_name_list_str, "file list",
384                     "file(s) to remove (remove old caches too)"),
385         OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"),
386         OPT_BOOLEAN('l', "list", &list_files, "list all cached files"),
387         OPT_STRING('M', "missing", &missing_filename, "file",
388                    "to find missing build ids in the cache"),
389         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
390         OPT_STRING('u', "update", &update_name_list_str, "file list",
391                     "file(s) to update"),
392         OPT_INCR('v', "verbose", &verbose, "be more verbose"),
393         OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
394         OPT_END()
395         };
396         const char * const buildid_cache_usage[] = {
397                 "perf buildid-cache [<options>]",
398                 NULL
399         };
400 
401         argc = parse_options(argc, argv, buildid_cache_options,
402                              buildid_cache_usage, 0);
403 
404         opts_flag = add_name_list_str || kcore_filename ||
405                 remove_name_list_str || purge_name_list_str ||
406                 missing_filename || update_name_list_str ||
407                 purge_all;
408 
409         if (argc || !(list_files || opts_flag))
410                 usage_with_options(buildid_cache_usage, buildid_cache_options);
411 
412         /* -l is exclusive. It can not be used with other options. */
413         if (list_files && opts_flag) {
414                 usage_with_options_msg(buildid_cache_usage,
415                         buildid_cache_options, "-l is exclusive.\n");
416         }
417 
418         if (ns_id > 0)
419                 nsi = nsinfo__new(ns_id);
420 
421         if (missing_filename) {
422                 data.path  = missing_filename;
423                 data.force = force;
424 
425                 session = perf_session__new(&data, false, NULL);
426                 if (IS_ERR(session))
427                         return PTR_ERR(session);
428         }
429 
430         if (symbol__init(session ? &session->header.env : NULL) < 0)
431                 goto out;
432 
433         setup_pager();
434 
435         if (list_files) {
436                 ret = build_id_cache__show_all();
437                 goto out;
438         }
439 
440         if (add_name_list_str) {
441                 list = strlist__new(add_name_list_str, NULL);
442                 if (list) {
443                         strlist__for_each_entry(pos, list)
444                                 if (build_id_cache__add_file(pos->s, nsi)) {
445                                         if (errno == EEXIST) {
446                                                 pr_debug("%s already in the cache\n",
447                                                          pos->s);
448                                                 continue;
449                                         }
450                                         pr_warning("Couldn't add %s: %s\n",
451                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
452                                 }
453 
454                         strlist__delete(list);
455                 }
456         }
457 
458         if (remove_name_list_str) {
459                 list = strlist__new(remove_name_list_str, NULL);
460                 if (list) {
461                         strlist__for_each_entry(pos, list)
462                                 if (build_id_cache__remove_file(pos->s, nsi)) {
463                                         if (errno == ENOENT) {
464                                                 pr_debug("%s wasn't in the cache\n",
465                                                          pos->s);
466                                                 continue;
467                                         }
468                                         pr_warning("Couldn't remove %s: %s\n",
469                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
470                                 }
471 
472                         strlist__delete(list);
473                 }
474         }
475 
476         if (purge_name_list_str) {
477                 list = strlist__new(purge_name_list_str, NULL);
478                 if (list) {
479                         strlist__for_each_entry(pos, list)
480                                 if (build_id_cache__purge_path(pos->s, nsi)) {
481                                         if (errno == ENOENT) {
482                                                 pr_debug("%s wasn't in the cache\n",
483                                                          pos->s);
484                                                 continue;
485                                         }
486                                         pr_warning("Couldn't remove %s: %s\n",
487                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
488                                 }
489 
490                         strlist__delete(list);
491                 }
492         }
493 
494         if (purge_all) {
495                 if (build_id_cache__purge_all()) {
496                         pr_warning("Couldn't remove some caches. Error: %s.\n",
497                                 str_error_r(errno, sbuf, sizeof(sbuf)));
498                 }
499         }
500 
501         if (missing_filename)
502                 ret = build_id_cache__fprintf_missing(session, stdout);
503 
504         if (update_name_list_str) {
505                 list = strlist__new(update_name_list_str, NULL);
506                 if (list) {
507                         strlist__for_each_entry(pos, list)
508                                 if (build_id_cache__update_file(pos->s, nsi)) {
509                                         if (errno == ENOENT) {
510                                                 pr_debug("%s wasn't in the cache\n",
511                                                          pos->s);
512                                                 continue;
513                                         }
514                                         pr_warning("Couldn't update %s: %s\n",
515                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
516                                 }
517 
518                         strlist__delete(list);
519                 }
520         }
521 
522         if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force))
523                 pr_warning("Couldn't add %s\n", kcore_filename);
524 
525 out:
526         perf_session__delete(session);
527         nsinfo__zput(nsi);
528 
529         return ret;
530 }
531 

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