evsel.c 6.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <errno.h>
  3. #include <unistd.h>
  4. #include <sys/syscall.h>
  5. #include <perf/evsel.h>
  6. #include <perf/cpumap.h>
  7. #include <perf/threadmap.h>
  8. #include <linux/list.h>
  9. #include <internal/evsel.h>
  10. #include <linux/zalloc.h>
  11. #include <stdlib.h>
  12. #include <internal/xyarray.h>
  13. #include <internal/cpumap.h>
  14. #include <internal/threadmap.h>
  15. #include <internal/lib.h>
  16. #include <linux/string.h>
  17. #include <sys/ioctl.h>
  18. void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr)
  19. {
  20. INIT_LIST_HEAD(&evsel->node);
  21. evsel->attr = *attr;
  22. }
  23. struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
  24. {
  25. struct perf_evsel *evsel = zalloc(sizeof(*evsel));
  26. if (evsel != NULL)
  27. perf_evsel__init(evsel, attr);
  28. return evsel;
  29. }
  30. void perf_evsel__delete(struct perf_evsel *evsel)
  31. {
  32. free(evsel);
  33. }
  34. #define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y))
  35. int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
  36. {
  37. evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
  38. if (evsel->fd) {
  39. int cpu, thread;
  40. for (cpu = 0; cpu < ncpus; cpu++) {
  41. for (thread = 0; thread < nthreads; thread++) {
  42. FD(evsel, cpu, thread) = -1;
  43. }
  44. }
  45. }
  46. return evsel->fd != NULL ? 0 : -ENOMEM;
  47. }
  48. static int
  49. sys_perf_event_open(struct perf_event_attr *attr,
  50. pid_t pid, int cpu, int group_fd,
  51. unsigned long flags)
  52. {
  53. return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
  54. }
  55. int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
  56. struct perf_thread_map *threads)
  57. {
  58. int cpu, thread, err = 0;
  59. if (cpus == NULL) {
  60. static struct perf_cpu_map *empty_cpu_map;
  61. if (empty_cpu_map == NULL) {
  62. empty_cpu_map = perf_cpu_map__dummy_new();
  63. if (empty_cpu_map == NULL)
  64. return -ENOMEM;
  65. }
  66. cpus = empty_cpu_map;
  67. }
  68. if (threads == NULL) {
  69. static struct perf_thread_map *empty_thread_map;
  70. if (empty_thread_map == NULL) {
  71. empty_thread_map = perf_thread_map__new_dummy();
  72. if (empty_thread_map == NULL)
  73. return -ENOMEM;
  74. }
  75. threads = empty_thread_map;
  76. }
  77. if (evsel->fd == NULL &&
  78. perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
  79. return -ENOMEM;
  80. for (cpu = 0; cpu < cpus->nr; cpu++) {
  81. for (thread = 0; thread < threads->nr; thread++) {
  82. int fd;
  83. fd = sys_perf_event_open(&evsel->attr,
  84. threads->map[thread].pid,
  85. cpus->map[cpu], -1, 0);
  86. if (fd < 0)
  87. return -errno;
  88. FD(evsel, cpu, thread) = fd;
  89. }
  90. }
  91. return err;
  92. }
  93. static void perf_evsel__close_fd_cpu(struct perf_evsel *evsel, int cpu)
  94. {
  95. int thread;
  96. for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
  97. if (FD(evsel, cpu, thread) >= 0)
  98. close(FD(evsel, cpu, thread));
  99. FD(evsel, cpu, thread) = -1;
  100. }
  101. }
  102. void perf_evsel__close_fd(struct perf_evsel *evsel)
  103. {
  104. int cpu;
  105. for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
  106. perf_evsel__close_fd_cpu(evsel, cpu);
  107. }
  108. void perf_evsel__free_fd(struct perf_evsel *evsel)
  109. {
  110. xyarray__delete(evsel->fd);
  111. evsel->fd = NULL;
  112. }
  113. void perf_evsel__close(struct perf_evsel *evsel)
  114. {
  115. if (evsel->fd == NULL)
  116. return;
  117. perf_evsel__close_fd(evsel);
  118. perf_evsel__free_fd(evsel);
  119. }
  120. void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu)
  121. {
  122. if (evsel->fd == NULL)
  123. return;
  124. perf_evsel__close_fd_cpu(evsel, cpu);
  125. }
  126. int perf_evsel__read_size(struct perf_evsel *evsel)
  127. {
  128. u64 read_format = evsel->attr.read_format;
  129. int entry = sizeof(u64); /* value */
  130. int size = 0;
  131. int nr = 1;
  132. if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  133. size += sizeof(u64);
  134. if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  135. size += sizeof(u64);
  136. if (read_format & PERF_FORMAT_ID)
  137. entry += sizeof(u64);
  138. if (read_format & PERF_FORMAT_GROUP) {
  139. nr = evsel->nr_members;
  140. size += sizeof(u64);
  141. }
  142. size += entry * nr;
  143. return size;
  144. }
  145. int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
  146. struct perf_counts_values *count)
  147. {
  148. size_t size = perf_evsel__read_size(evsel);
  149. memset(count, 0, sizeof(*count));
  150. if (FD(evsel, cpu, thread) < 0)
  151. return -EINVAL;
  152. if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
  153. return -errno;
  154. return 0;
  155. }
  156. static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
  157. int ioc, void *arg,
  158. int cpu)
  159. {
  160. int thread;
  161. for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
  162. int fd = FD(evsel, cpu, thread),
  163. err = ioctl(fd, ioc, arg);
  164. if (err)
  165. return err;
  166. }
  167. return 0;
  168. }
  169. int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu)
  170. {
  171. return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu);
  172. }
  173. int perf_evsel__enable(struct perf_evsel *evsel)
  174. {
  175. int i;
  176. int err = 0;
  177. for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
  178. err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i);
  179. return err;
  180. }
  181. int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu)
  182. {
  183. return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu);
  184. }
  185. int perf_evsel__disable(struct perf_evsel *evsel)
  186. {
  187. int i;
  188. int err = 0;
  189. for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
  190. err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, i);
  191. return err;
  192. }
  193. int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
  194. {
  195. int err = 0, i;
  196. for (i = 0; i < evsel->cpus->nr && !err; i++)
  197. err = perf_evsel__run_ioctl(evsel,
  198. PERF_EVENT_IOC_SET_FILTER,
  199. (void *)filter, i);
  200. return err;
  201. }
  202. struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
  203. {
  204. return evsel->cpus;
  205. }
  206. struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel)
  207. {
  208. return evsel->threads;
  209. }
  210. struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel)
  211. {
  212. return &evsel->attr;
  213. }
  214. int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
  215. {
  216. if (ncpus == 0 || nthreads == 0)
  217. return 0;
  218. if (evsel->system_wide)
  219. nthreads = 1;
  220. evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
  221. if (evsel->sample_id == NULL)
  222. return -ENOMEM;
  223. evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
  224. if (evsel->id == NULL) {
  225. xyarray__delete(evsel->sample_id);
  226. evsel->sample_id = NULL;
  227. return -ENOMEM;
  228. }
  229. return 0;
  230. }
  231. void perf_evsel__free_id(struct perf_evsel *evsel)
  232. {
  233. xyarray__delete(evsel->sample_id);
  234. evsel->sample_id = NULL;
  235. zfree(&evsel->id);
  236. evsel->ids = 0;
  237. }