1 // SPDX-License-Identifier: GPL-2.0
2 #include <dirent.h>
3 #include <errno.h>
4 #include <limits.h>
5 #include <stdbool.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <sys/types.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include "string2.h"
12 #include "strlist.h"
13 #include <string.h>
14 #include <api/fs/fs.h>
15 #include <linux/string.h>
16 #include <linux/zalloc.h>
17 #include "asm/bug.h"
18 #include "thread_map.h"
19 #include "debug.h"
20 #include "event.h"
21 #include <internal/threadmap.h>
22
23 /* Skip "." and ".." directories */
filter(const struct dirent * dir)24 static int filter(const struct dirent *dir)
25 {
26 if (dir->d_name[0] == '.')
27 return 0;
28 else
29 return 1;
30 }
31
32 #define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
33
thread_map__new_by_pid(pid_t pid)34 struct perf_thread_map *thread_map__new_by_pid(pid_t pid)
35 {
36 struct perf_thread_map *threads;
37 char name[256];
38 int items;
39 struct dirent **namelist = NULL;
40 int i;
41
42 sprintf(name, "/proc/%d/task", pid);
43 items = scandir(name, &namelist, filter, NULL);
44 if (items <= 0)
45 return NULL;
46
47 threads = thread_map__alloc(items);
48 if (threads != NULL) {
49 for (i = 0; i < items; i++)
50 perf_thread_map__set_pid(threads, i, atoi(namelist[i]->d_name));
51 threads->nr = items;
52 refcount_set(&threads->refcnt, 1);
53 }
54
55 for (i=0; i<items; i++)
56 zfree(&namelist[i]);
57 free(namelist);
58
59 return threads;
60 }
61
thread_map__new_by_tid(pid_t tid)62 struct perf_thread_map *thread_map__new_by_tid(pid_t tid)
63 {
64 struct perf_thread_map *threads = thread_map__alloc(1);
65
66 if (threads != NULL) {
67 perf_thread_map__set_pid(threads, 0, tid);
68 threads->nr = 1;
69 refcount_set(&threads->refcnt, 1);
70 }
71
72 return threads;
73 }
74
__thread_map__new_all_cpus(uid_t uid)75 static struct perf_thread_map *__thread_map__new_all_cpus(uid_t uid)
76 {
77 DIR *proc;
78 int max_threads = 32, items, i;
79 char path[NAME_MAX + 1 + 6];
80 struct dirent *dirent, **namelist = NULL;
81 struct perf_thread_map *threads = thread_map__alloc(max_threads);
82
83 if (threads == NULL)
84 goto out;
85
86 proc = opendir("/proc");
87 if (proc == NULL)
88 goto out_free_threads;
89
90 threads->nr = 0;
91 refcount_set(&threads->refcnt, 1);
92
93 while ((dirent = readdir(proc)) != NULL) {
94 char *end;
95 bool grow = false;
96 pid_t pid = strtol(dirent->d_name, &end, 10);
97
98 if (*end) /* only interested in proper numerical dirents */
99 continue;
100
101 snprintf(path, sizeof(path), "/proc/%s", dirent->d_name);
102
103 if (uid != UINT_MAX) {
104 struct stat st;
105
106 if (stat(path, &st) != 0 || st.st_uid != uid)
107 continue;
108 }
109
110 snprintf(path, sizeof(path), "/proc/%d/task", pid);
111 items = scandir(path, &namelist, filter, NULL);
112 if (items <= 0)
113 goto out_free_closedir;
114
115 while (threads->nr + items >= max_threads) {
116 max_threads *= 2;
117 grow = true;
118 }
119
120 if (grow) {
121 struct perf_thread_map *tmp;
122
123 tmp = perf_thread_map__realloc(threads, max_threads);
124 if (tmp == NULL)
125 goto out_free_namelist;
126
127 threads = tmp;
128 }
129
130 for (i = 0; i < items; i++) {
131 perf_thread_map__set_pid(threads, threads->nr + i,
132 atoi(namelist[i]->d_name));
133 }
134
135 for (i = 0; i < items; i++)
136 zfree(&namelist[i]);
137 free(namelist);
138
139 threads->nr += items;
140 }
141
142 out_closedir:
143 closedir(proc);
144 out:
145 return threads;
146
147 out_free_threads:
148 free(threads);
149 return NULL;
150
151 out_free_namelist:
152 for (i = 0; i < items; i++)
153 zfree(&namelist[i]);
154 free(namelist);
155
156 out_free_closedir:
157 zfree(&threads);
158 goto out_closedir;
159 }
160
thread_map__new_all_cpus(void)161 struct perf_thread_map *thread_map__new_all_cpus(void)
162 {
163 return __thread_map__new_all_cpus(UINT_MAX);
164 }
165
thread_map__new_by_uid(uid_t uid)166 struct perf_thread_map *thread_map__new_by_uid(uid_t uid)
167 {
168 return __thread_map__new_all_cpus(uid);
169 }
170
thread_map__new(pid_t pid,pid_t tid,uid_t uid)171 struct perf_thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
172 {
173 if (pid != -1)
174 return thread_map__new_by_pid(pid);
175
176 if (tid == -1 && uid != UINT_MAX)
177 return thread_map__new_by_uid(uid);
178
179 return thread_map__new_by_tid(tid);
180 }
181
thread_map__new_by_pid_str(const char * pid_str)182 static struct perf_thread_map *thread_map__new_by_pid_str(const char *pid_str)
183 {
184 struct perf_thread_map *threads = NULL, *nt;
185 char name[256];
186 int items, total_tasks = 0;
187 struct dirent **namelist = NULL;
188 int i, j = 0;
189 pid_t pid, prev_pid = INT_MAX;
190 char *end_ptr;
191 struct str_node *pos;
192 struct strlist_config slist_config = { .dont_dupstr = true, };
193 struct strlist *slist = strlist__new(pid_str, &slist_config);
194
195 if (!slist)
196 return NULL;
197
198 strlist__for_each_entry(pos, slist) {
199 pid = strtol(pos->s, &end_ptr, 10);
200
201 if (pid == INT_MIN || pid == INT_MAX ||
202 (*end_ptr != '\0' && *end_ptr != ','))
203 goto out_free_threads;
204
205 if (pid == prev_pid)
206 continue;
207
208 sprintf(name, "/proc/%d/task", pid);
209 items = scandir(name, &namelist, filter, NULL);
210 if (items <= 0)
211 goto out_free_threads;
212
213 total_tasks += items;
214 nt = perf_thread_map__realloc(threads, total_tasks);
215 if (nt == NULL)
216 goto out_free_namelist;
217
218 threads = nt;
219
220 for (i = 0; i < items; i++) {
221 perf_thread_map__set_pid(threads, j++, atoi(namelist[i]->d_name));
222 zfree(&namelist[i]);
223 }
224 threads->nr = total_tasks;
225 free(namelist);
226 }
227
228 out:
229 strlist__delete(slist);
230 if (threads)
231 refcount_set(&threads->refcnt, 1);
232 return threads;
233
234 out_free_namelist:
235 for (i = 0; i < items; i++)
236 zfree(&namelist[i]);
237 free(namelist);
238
239 out_free_threads:
240 zfree(&threads);
241 goto out;
242 }
243
thread_map__new_by_tid_str(const char * tid_str)244 struct perf_thread_map *thread_map__new_by_tid_str(const char *tid_str)
245 {
246 struct perf_thread_map *threads = NULL, *nt;
247 int ntasks = 0;
248 pid_t tid, prev_tid = INT_MAX;
249 char *end_ptr;
250 struct str_node *pos;
251 struct strlist_config slist_config = { .dont_dupstr = true, };
252 struct strlist *slist;
253
254 /* perf-stat expects threads to be generated even if tid not given */
255 if (!tid_str)
256 return perf_thread_map__new_dummy();
257
258 slist = strlist__new(tid_str, &slist_config);
259 if (!slist)
260 return NULL;
261
262 strlist__for_each_entry(pos, slist) {
263 tid = strtol(pos->s, &end_ptr, 10);
264
265 if (tid == INT_MIN || tid == INT_MAX ||
266 (*end_ptr != '\0' && *end_ptr != ','))
267 goto out_free_threads;
268
269 if (tid == prev_tid)
270 continue;
271
272 ntasks++;
273 nt = perf_thread_map__realloc(threads, ntasks);
274
275 if (nt == NULL)
276 goto out_free_threads;
277
278 threads = nt;
279 perf_thread_map__set_pid(threads, ntasks - 1, tid);
280 threads->nr = ntasks;
281 }
282 out:
283 strlist__delete(slist);
284 if (threads)
285 refcount_set(&threads->refcnt, 1);
286 return threads;
287
288 out_free_threads:
289 zfree(&threads);
290 goto out;
291 }
292
thread_map__new_str(const char * pid,const char * tid,uid_t uid,bool all_threads)293 struct perf_thread_map *thread_map__new_str(const char *pid, const char *tid,
294 uid_t uid, bool all_threads)
295 {
296 if (pid)
297 return thread_map__new_by_pid_str(pid);
298
299 if (!tid && uid != UINT_MAX)
300 return thread_map__new_by_uid(uid);
301
302 if (all_threads)
303 return thread_map__new_all_cpus();
304
305 return thread_map__new_by_tid_str(tid);
306 }
307
thread_map__fprintf(struct perf_thread_map * threads,FILE * fp)308 size_t thread_map__fprintf(struct perf_thread_map *threads, FILE *fp)
309 {
310 int i;
311 size_t printed = fprintf(fp, "%d thread%s: ",
312 threads->nr, threads->nr > 1 ? "s" : "");
313 for (i = 0; i < threads->nr; ++i)
314 printed += fprintf(fp, "%s%d", i ? ", " : "", perf_thread_map__pid(threads, i));
315
316 return printed + fprintf(fp, "\n");
317 }
318
get_comm(char ** comm,pid_t pid)319 static int get_comm(char **comm, pid_t pid)
320 {
321 char *path;
322 size_t size;
323 int err;
324
325 if (asprintf(&path, "%s/%d/comm", procfs__mountpoint(), pid) == -1)
326 return -ENOMEM;
327
328 err = filename__read_str(path, comm, &size);
329 if (!err) {
330 /*
331 * We're reading 16 bytes, while filename__read_str
332 * allocates data per BUFSIZ bytes, so we can safely
333 * mark the end of the string.
334 */
335 (*comm)[size] = 0;
336 strim(*comm);
337 }
338
339 free(path);
340 return err;
341 }
342
comm_init(struct perf_thread_map * map,int i)343 static void comm_init(struct perf_thread_map *map, int i)
344 {
345 pid_t pid = perf_thread_map__pid(map, i);
346 char *comm = NULL;
347
348 /* dummy pid comm initialization */
349 if (pid == -1) {
350 map->map[i].comm = strdup("dummy");
351 return;
352 }
353
354 /*
355 * The comm name is like extra bonus ;-),
356 * so just warn if we fail for any reason.
357 */
358 if (get_comm(&comm, pid))
359 pr_warning("Couldn't resolve comm name for pid %d\n", pid);
360
361 map->map[i].comm = comm;
362 }
363
thread_map__read_comms(struct perf_thread_map * threads)364 void thread_map__read_comms(struct perf_thread_map *threads)
365 {
366 int i;
367
368 for (i = 0; i < threads->nr; ++i)
369 comm_init(threads, i);
370 }
371
thread_map__copy_event(struct perf_thread_map * threads,struct perf_record_thread_map * event)372 static void thread_map__copy_event(struct perf_thread_map *threads,
373 struct perf_record_thread_map *event)
374 {
375 unsigned i;
376
377 threads->nr = (int) event->nr;
378
379 for (i = 0; i < event->nr; i++) {
380 perf_thread_map__set_pid(threads, i, (pid_t) event->entries[i].pid);
381 threads->map[i].comm = strndup(event->entries[i].comm, 16);
382 }
383
384 refcount_set(&threads->refcnt, 1);
385 }
386
thread_map__new_event(struct perf_record_thread_map * event)387 struct perf_thread_map *thread_map__new_event(struct perf_record_thread_map *event)
388 {
389 struct perf_thread_map *threads;
390
391 threads = thread_map__alloc(event->nr);
392 if (threads)
393 thread_map__copy_event(threads, event);
394
395 return threads;
396 }
397
thread_map__has(struct perf_thread_map * threads,pid_t pid)398 bool thread_map__has(struct perf_thread_map *threads, pid_t pid)
399 {
400 int i;
401
402 for (i = 0; i < threads->nr; ++i) {
403 if (threads->map[i].pid == pid)
404 return true;
405 }
406
407 return false;
408 }
409
thread_map__remove(struct perf_thread_map * threads,int idx)410 int thread_map__remove(struct perf_thread_map *threads, int idx)
411 {
412 int i;
413
414 if (threads->nr < 1)
415 return -EINVAL;
416
417 if (idx >= threads->nr)
418 return -EINVAL;
419
420 /*
421 * Free the 'idx' item and shift the rest up.
422 */
423 zfree(&threads->map[idx].comm);
424
425 for (i = idx; i < threads->nr - 1; i++)
426 threads->map[i] = threads->map[i + 1];
427
428 threads->nr--;
429 return 0;
430 }
431