tools/perf/lib/evlist.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <perf/evlist.h>
   3 #include <perf/evsel.h>
   4 #include <linux/bitops.h>
   5 #include <linux/list.h>
   6 #include <linux/hash.h>
   7 #include <sys/ioctl.h>
   8 #include <internal/evlist.h>
   9 #include <internal/evsel.h>
  10 #include <internal/xyarray.h>
  11 #include <linux/zalloc.h>
  12 #include <stdlib.h>
  13 #include <errno.h>
  14 #include <unistd.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <poll.h>
  18 #include <perf/cpumap.h>
  19 #include <perf/threadmap.h>
  20 #include <api/fd/array.h>
  21
  22 void perf_evlist__init(struct perf_evlist *evlist)
  23 {
  24         int i;
  25
  26         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  27                 INIT_HLIST_HEAD(&evlist->heads[i]);
  28         INIT_LIST_HEAD(&evlist->entries);
  29         evlist->nr_entries = 0;
  30 }
  31
  32 static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
  33                                           struct perf_evsel *evsel)
  34 {
  35         /*
  36          * We already have cpus for evsel (via PMU sysfs) so
  37          * keep it, if there's no target cpu list defined.
  38          */
  39         if (!evsel->own_cpus || evlist->has_user_cpus) {
  40                 perf_cpu_map__put(evsel->cpus);
  41                 evsel->cpus = perf_cpu_map__get(evlist->cpus);
  42         } else if (evsel->cpus != evsel->own_cpus) {
  43                 perf_cpu_map__put(evsel->cpus);
  44                 evsel->cpus = perf_cpu_map__get(evsel->own_cpus);
  45         }
  46
  47         perf_thread_map__put(evsel->threads);
  48         evsel->threads = perf_thread_map__get(evlist->threads);
  49 }
  50
  51 static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
  52 {
  53         struct perf_evsel *evsel;
  54
  55         perf_evlist__for_each_evsel(evlist, evsel)
  56                 __perf_evlist__propagate_maps(evlist, evsel);
  57 }
  58
  59 void perf_evlist__add(struct perf_evlist *evlist,
  60                       struct perf_evsel *evsel)
  61 {
  62         list_add_tail(&evsel->node, &evlist->entries);
  63         evlist->nr_entries += 1;
  64         __perf_evlist__propagate_maps(evlist, evsel);
  65 }
  66
  67 void perf_evlist__remove(struct perf_evlist *evlist,
  68                          struct perf_evsel *evsel)
  69 {
  70         list_del_init(&evsel->node);
  71         evlist->nr_entries -= 1;
  72 }
  73
  74 struct perf_evlist *perf_evlist__new(void)
  75 {
  76         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  77
  78         if (evlist != NULL)
  79                 perf_evlist__init(evlist);
  80
  81         return evlist;
  82 }
  83
  84 struct perf_evsel *
  85 perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
  86 {
  87         struct perf_evsel *next;
  88
  89         if (!prev) {
  90                 next = list_first_entry(&evlist->entries,
  91                                         struct perf_evsel,
  92                                         node);
  93         } else {
  94                 next = list_next_entry(prev, node);
  95         }
  96
  97         /* Empty list is noticed here so don't need checking on entry. */
  98         if (&next->node == &evlist->entries)
  99                 return NULL;
 100
 101         return next;
 102 }
 103
 104 void perf_evlist__delete(struct perf_evlist *evlist)
 105 {
 106         free(evlist);
 107 }
 108
 109 void perf_evlist__set_maps(struct perf_evlist *evlist,
 110                            struct perf_cpu_map *cpus,
 111                            struct perf_thread_map *threads)
 112 {
 113         /*
 114          * Allow for the possibility that one or another of the maps isn't being
 115          * changed i.e. don't put it.  Note we are assuming the maps that are
 116          * being applied are brand new and evlist is taking ownership of the
 117          * original reference count of 1.  If that is not the case it is up to
 118          * the caller to increase the reference count.
 119          */
 120         if (cpus != evlist->cpus) {
 121                 perf_cpu_map__put(evlist->cpus);
 122                 evlist->cpus = perf_cpu_map__get(cpus);
 123         }
 124
 125         if (threads != evlist->threads) {
 126                 perf_thread_map__put(evlist->threads);
 127                 evlist->threads = perf_thread_map__get(threads);
 128         }
 129
 130         perf_evlist__propagate_maps(evlist);
 131 }
 132
 133 int perf_evlist__open(struct perf_evlist *evlist)
 134 {
 135         struct perf_evsel *evsel;
 136         int err;
 137
 138         perf_evlist__for_each_entry(evlist, evsel) {
 139                 err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
 140                 if (err < 0)
 141                         goto out_err;
 142         }
 143
 144         return 0;
 145
 146 out_err:
 147         perf_evlist__close(evlist);
 148         return err;
 149 }
 150
 151 void perf_evlist__close(struct perf_evlist *evlist)
 152 {
 153         struct perf_evsel *evsel;
 154
 155         perf_evlist__for_each_entry_reverse(evlist, evsel)
 156                 perf_evsel__close(evsel);
 157 }
 158
 159 void perf_evlist__enable(struct perf_evlist *evlist)
 160 {
 161         struct perf_evsel *evsel;
 162
 163         perf_evlist__for_each_entry(evlist, evsel)
 164                 perf_evsel__enable(evsel);
 165 }
 166
 167 void perf_evlist__disable(struct perf_evlist *evlist)
 168 {
 169         struct perf_evsel *evsel;
 170
 171         perf_evlist__for_each_entry(evlist, evsel)
 172                 perf_evsel__disable(evsel);
 173 }
 174
 175 u64 perf_evlist__read_format(struct perf_evlist *evlist)
 176 {
 177         struct perf_evsel *first = perf_evlist__first(evlist);
 178
 179         return first->attr.read_format;
 180 }
 181
 182 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
 183
 184 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 185                                  struct perf_evsel *evsel,
 186                                  int cpu, int thread, u64 id)
 187 {
 188         int hash;
 189         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 190
 191         sid->id = id;
 192         sid->evsel = evsel;
 193         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 194         hlist_add_head(&sid->node, &evlist->heads[hash]);
 195 }
 196
 197 void perf_evlist__id_add(struct perf_evlist *evlist,
 198                          struct perf_evsel *evsel,
 199                          int cpu, int thread, u64 id)
 200 {
 201         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 202         evsel->id[evsel->ids++] = id;
 203 }
 204
 205 int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 206                            struct perf_evsel *evsel,
 207                            int cpu, int thread, int fd)
 208 {
 209         u64 read_data[4] = { 0, };
 210         int id_idx = 1; /* The first entry is the counter value */
 211         u64 id;
 212         int ret;
 213
 214         ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
 215         if (!ret)
 216                 goto add;
 217
 218         if (errno != ENOTTY)
 219                 return -1;
 220
 221         /* Legacy way to get event id.. All hail to old kernels! */
 222
 223         /*
 224          * This way does not work with group format read, so bail
 225          * out in that case.
 226          */
 227         if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
 228                 return -1;
 229
 230         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 231             read(fd, &read_data, sizeof(read_data)) == -1)
 232                 return -1;
 233
 234         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 235                 ++id_idx;
 236         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 237                 ++id_idx;
 238
 239         id = read_data[id_idx];
 240
 241 add:
 242         perf_evlist__id_add(evlist, evsel, cpu, thread, id);
 243         return 0;
 244 }
 245
 246 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 247 {
 248         int nr_cpus = perf_cpu_map__nr(evlist->cpus);
 249         int nr_threads = perf_thread_map__nr(evlist->threads);
 250         int nfds = 0;
 251         struct perf_evsel *evsel;
 252
 253         perf_evlist__for_each_entry(evlist, evsel) {
 254                 if (evsel->system_wide)
 255                         nfds += nr_cpus;
 256                 else
 257                         nfds += nr_cpus * nr_threads;
 258         }
 259
 260         if (fdarray__available_entries(&evlist->pollfd) < nfds &&
 261             fdarray__grow(&evlist->pollfd, nfds) < 0)
 262                 return -ENOMEM;
 263
 264         return 0;
 265 }
 266
 267 int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
 268                             void *ptr, short revent)
 269 {
 270         int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
 271
 272         if (pos >= 0) {
 273                 evlist->pollfd.priv[pos].ptr = ptr;
 274                 fcntl(fd, F_SETFL, O_NONBLOCK);
 275         }
 276
 277         return pos;
 278 }
 279
 280 int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
 281 {
 282         return fdarray__poll(&evlist->pollfd, timeout);
 283 }