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

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