tools/perf/util/evsel.c

   1 /*
   2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   3  *
   4  * Parts came from builtin-{top,stat,record}.c, see those files for further
   5  * copyright notes.
   6  *
   7  * Released under the GPL v2. (and only v2, not any later version)
   8  */
   9
  10 #include "evsel.h"
  11 #include "evlist.h"
  12 #include "util.h"
  13 #include "cpumap.h"
  14 #include "thread_map.h"
  15
  16 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  17
  18 int __perf_evsel__sample_size(u64 sample_type)
  19 {
  20         u64 mask = sample_type & PERF_SAMPLE_MASK;
  21         int size = 0;
  22         int i;
  23
  24         for (i = 0; i < 64; i++) {
  25                 if (mask & (1ULL << i))
  26                         size++;
  27         }
  28
  29         size *= sizeof(u64);
  30
  31         return size;
  32 }
  33
  34 void perf_evsel__init(struct perf_evsel *evsel,
  35                       struct perf_event_attr *attr, int idx)
  36 {
  37         evsel->idx         = idx;
  38         evsel->attr        = *attr;
  39         INIT_LIST_HEAD(&evsel->node);
  40 }
  41
  42 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
  43 {
  44         struct perf_evsel *evsel = zalloc(sizeof(*evsel));
  45
  46         if (evsel != NULL)
  47                 perf_evsel__init(evsel, attr, idx);
  48
  49         return evsel;
  50 }
  51
  52 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
  53 {
  54         int cpu, thread;
  55         evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
  56
  57         if (evsel->fd) {
  58                 for (cpu = 0; cpu < ncpus; cpu++) {
  59                         for (thread = 0; thread < nthreads; thread++) {
  60                                 FD(evsel, cpu, thread) = -1;
  61                         }
  62                 }
  63         }
  64
  65         return evsel->fd != NULL ? 0 : -ENOMEM;
  66 }
  67
  68 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
  69 {
  70         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
  71         if (evsel->sample_id == NULL)
  72                 return -ENOMEM;
  73
  74         evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
  75         if (evsel->id == NULL) {
  76                 xyarray__delete(evsel->sample_id);
  77                 evsel->sample_id = NULL;
  78                 return -ENOMEM;
  79         }
  80
  81         return 0;
  82 }
  83
  84 int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
  85 {
  86         evsel->counts = zalloc((sizeof(*evsel->counts) +
  87                                 (ncpus * sizeof(struct perf_counts_values))));
  88         return evsel->counts != NULL ? 0 : -ENOMEM;
  89 }
  90
  91 void perf_evsel__free_fd(struct perf_evsel *evsel)
  92 {
  93         xyarray__delete(evsel->fd);
  94         evsel->fd = NULL;
  95 }
  96
  97 void perf_evsel__free_id(struct perf_evsel *evsel)
  98 {
  99         xyarray__delete(evsel->sample_id);
 100         evsel->sample_id = NULL;
 101         free(evsel->id);
 102         evsel->id = NULL;
 103 }
 104
 105 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 106 {
 107         int cpu, thread;
 108
 109         for (cpu = 0; cpu < ncpus; cpu++)
 110                 for (thread = 0; thread < nthreads; ++thread) {
 111                         close(FD(evsel, cpu, thread));
 112                         FD(evsel, cpu, thread) = -1;
 113                 }
 114 }
 115
 116 void perf_evsel__exit(struct perf_evsel *evsel)
 117 {
 118         assert(list_empty(&evsel->node));
 119         xyarray__delete(evsel->fd);
 120         xyarray__delete(evsel->sample_id);
 121         free(evsel->id);
 122 }
 123
 124 void perf_evsel__delete(struct perf_evsel *evsel)
 125 {
 126         perf_evsel__exit(evsel);
 127         close_cgroup(evsel->cgrp);
 128         free(evsel->name);
 129         free(evsel);
 130 }
 131
 132 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
 133                               int cpu, int thread, bool scale)
 134 {
 135         struct perf_counts_values count;
 136         size_t nv = scale ? 3 : 1;
 137
 138         if (FD(evsel, cpu, thread) < 0)
 139                 return -EINVAL;
 140
 141         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
 142                 return -ENOMEM;
 143
 144         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
 145                 return -errno;
 146
 147         if (scale) {
 148                 if (count.run == 0)
 149                         count.val = 0;
 150                 else if (count.run < count.ena)
 151                         count.val = (u64)((double)count.val * count.ena / count.run + 0.5);
 152         } else
 153                 count.ena = count.run = 0;
 154
 155         evsel->counts->cpu[cpu] = count;
 156         return 0;
 157 }
 158
 159 int __perf_evsel__read(struct perf_evsel *evsel,
 160                        int ncpus, int nthreads, bool scale)
 161 {
 162         size_t nv = scale ? 3 : 1;
 163         int cpu, thread;
 164         struct perf_counts_values *aggr = &evsel->counts->aggr, count;
 165
 166         aggr->val = aggr->ena = aggr->run = 0;
 167
 168         for (cpu = 0; cpu < ncpus; cpu++) {
 169                 for (thread = 0; thread < nthreads; thread++) {
 170                         if (FD(evsel, cpu, thread) < 0)
 171                                 continue;
 172
 173                         if (readn(FD(evsel, cpu, thread),
 174                                   &count, nv * sizeof(u64)) < 0)
 175                                 return -errno;
 176
 177                         aggr->val += count.val;
 178                         if (scale) {
 179                                 aggr->ena += count.ena;
 180                                 aggr->run += count.run;
 181                         }
 182                 }
 183         }
 184
 185         evsel->counts->scaled = 0;
 186         if (scale) {
 187                 if (aggr->run == 0) {
 188                         evsel->counts->scaled = -1;
 189                         aggr->val = 0;
 190                         return 0;
 191                 }
 192
 193                 if (aggr->run < aggr->ena) {
 194                         evsel->counts->scaled = 1;
 195                         aggr->val = (u64)((double)aggr->val * aggr->ena / aggr->run + 0.5);
 196                 }
 197         } else
 198                 aggr->ena = aggr->run = 0;
 199
 200         return 0;
 201 }
 202
 203 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 204                               struct thread_map *threads, bool group)
 205 {
 206         int cpu, thread;
 207         unsigned long flags = 0;
 208         int pid = -1;
 209
 210         if (evsel->fd == NULL &&
 211             perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
 212                 return -1;
 213
 214         if (evsel->cgrp) {
 215                 flags = PERF_FLAG_PID_CGROUP;
 216                 pid = evsel->cgrp->fd;
 217         }
 218
 219         for (cpu = 0; cpu < cpus->nr; cpu++) {
 220                 int group_fd = -1;
 221
 222                 for (thread = 0; thread < threads->nr; thread++) {
 223
 224                         if (!evsel->cgrp)
 225                                 pid = threads->map[thread];
 226
 227                         FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
 228                                                                      pid,
 229                                                                      cpus->map[cpu],
 230                                                                      group_fd, flags);
 231                         if (FD(evsel, cpu, thread) < 0)
 232                                 goto out_close;
 233
 234                         if (group && group_fd == -1)
 235                                 group_fd = FD(evsel, cpu, thread);
 236                 }
 237         }
 238
 239         return 0;
 240
 241 out_close:
 242         do {
 243                 while (--thread >= 0) {
 244                         close(FD(evsel, cpu, thread));
 245                         FD(evsel, cpu, thread) = -1;
 246                 }
 247                 thread = threads->nr;
 248         } while (--cpu >= 0);
 249         return -1;
 250 }
 251
 252 static struct {
 253         struct cpu_map map;
 254         int cpus[1];
 255 } empty_cpu_map = {
 256         .map.nr = 1,
 257         .cpus   = { -1, },
 258 };
 259
 260 static struct {
 261         struct thread_map map;
 262         int threads[1];
 263 } empty_thread_map = {
 264         .map.nr  = 1,
 265         .threads = { -1, },
 266 };
 267
 268 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 269                      struct thread_map *threads, bool group)
 270 {
 271         if (cpus == NULL) {
 272                 /* Work around old compiler warnings about strict aliasing */
 273                 cpus = &empty_cpu_map.map;
 274         }
 275
 276         if (threads == NULL)
 277                 threads = &empty_thread_map.map;
 278
 279         return __perf_evsel__open(evsel, cpus, threads, group);
 280 }
 281
 282 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
 283                              struct cpu_map *cpus, bool group)
 284 {
 285         return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group);
 286 }
 287
 288 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
 289                                 struct thread_map *threads, bool group)
 290 {
 291         return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group);
 292 }
 293
 294 static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
 295                                        struct perf_sample *sample)
 296 {
 297         const u64 *array = event->sample.array;
 298
 299         array += ((event->header.size -
 300                    sizeof(event->header)) / sizeof(u64)) - 1;
 301
 302         if (type & PERF_SAMPLE_CPU) {
 303                 u32 *p = (u32 *)array;
 304                 sample->cpu = *p;
 305                 array--;
 306         }
 307
 308         if (type & PERF_SAMPLE_STREAM_ID) {
 309                 sample->stream_id = *array;
 310                 array--;
 311         }
 312
 313         if (type & PERF_SAMPLE_ID) {
 314                 sample->id = *array;
 315                 array--;
 316         }
 317
 318         if (type & PERF_SAMPLE_TIME) {
 319                 sample->time = *array;
 320                 array--;
 321         }
 322
 323         if (type & PERF_SAMPLE_TID) {
 324                 u32 *p = (u32 *)array;
 325                 sample->pid = p[0];
 326                 sample->tid = p[1];
 327         }
 328
 329         return 0;
 330 }
 331
 332 static bool sample_overlap(const union perf_event *event,
 333                            const void *offset, u64 size)
 334 {
 335         const void *base = event;
 336
 337         if (offset + size > base + event->header.size)
 338                 return true;
 339
 340         return false;
 341 }
 342
 343 int perf_event__parse_sample(const union perf_event *event, u64 type,
 344                              int sample_size, bool sample_id_all,
 345                              struct perf_sample *data)
 346 {
 347         const u64 *array;
 348
 349         data->cpu = data->pid = data->tid = -1;
 350         data->stream_id = data->id = data->time = -1ULL;
 351
 352         if (event->header.type != PERF_RECORD_SAMPLE) {
 353                 if (!sample_id_all)
 354                         return 0;
 355                 return perf_event__parse_id_sample(event, type, data);
 356         }
 357
 358         array = event->sample.array;
 359
 360         if (sample_size + sizeof(event->header) > event->header.size)
 361                 return -EFAULT;
 362
 363         if (type & PERF_SAMPLE_IP) {
 364                 data->ip = event->ip.ip;
 365                 array++;
 366         }
 367
 368         if (type & PERF_SAMPLE_TID) {
 369                 u32 *p = (u32 *)array;
 370                 data->pid = p[0];
 371                 data->tid = p[1];
 372                 array++;
 373         }
 374
 375         if (type & PERF_SAMPLE_TIME) {
 376                 data->time = *array;
 377                 array++;
 378         }
 379
 380         if (type & PERF_SAMPLE_ADDR) {
 381                 data->addr = *array;
 382                 array++;
 383         }
 384
 385         data->id = -1ULL;
 386         if (type & PERF_SAMPLE_ID) {
 387                 data->id = *array;
 388                 array++;
 389         }
 390
 391         if (type & PERF_SAMPLE_STREAM_ID) {
 392                 data->stream_id = *array;
 393                 array++;
 394         }
 395
 396         if (type & PERF_SAMPLE_CPU) {
 397                 u32 *p = (u32 *)array;
 398                 data->cpu = *p;
 399                 array++;
 400         }
 401
 402         if (type & PERF_SAMPLE_PERIOD) {
 403                 data->period = *array;
 404                 array++;
 405         }
 406
 407         if (type & PERF_SAMPLE_READ) {
 408                 fprintf(stderr, "PERF_SAMPLE_READ is unsuported for now\n");
 409                 return -1;
 410         }
 411
 412         if (type & PERF_SAMPLE_CALLCHAIN) {
 413                 if (sample_overlap(event, array, sizeof(data->callchain->nr)))
 414                         return -EFAULT;
 415
 416                 data->callchain = (struct ip_callchain *)array;
 417
 418                 if (sample_overlap(event, array, data->callchain->nr))
 419                         return -EFAULT;
 420
 421                 array += 1 + data->callchain->nr;
 422         }
 423
 424         if (type & PERF_SAMPLE_RAW) {
 425                 u32 *p = (u32 *)array;
 426
 427                 if (sample_overlap(event, array, sizeof(u32)))
 428                         return -EFAULT;
 429
 430                 data->raw_size = *p;
 431                 p++;
 432
 433                 if (sample_overlap(event, p, data->raw_size))
 434                         return -EFAULT;
 435
 436                 data->raw_data = p;
 437         }
 438
 439         return 0;
 440 }