tools/perf/util/print-events.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <dirent.h>
   3 #include <errno.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <fcntl.h>
   8 #include <sys/param.h>
   9 #include <unistd.h>
  10
  11 #include <api/fs/tracing_path.h>
  12 #include <api/io.h>
  13 #include <linux/stddef.h>
  14 #include <linux/perf_event.h>
  15 #include <linux/zalloc.h>
  16 #include <subcmd/pager.h>
  17
  18 #include "build-id.h"
  19 #include "debug.h"
  20 #include "evsel.h"
  21 #include "metricgroup.h"
  22 #include "parse-events.h"
  23 #include "pmu.h"
  24 #include "pmus.h"
  25 #include "print-events.h"
  26 #include "probe-file.h"
  27 #include "string2.h"
  28 #include "strlist.h"
  29 #include "tracepoint.h"
  30 #include "pfm.h"
  31 #include "thread_map.h"
  32 #include "tool_pmu.h"
  33 #include "util.h"
  34
  35 #define MAX_NAME_LEN 100
  36
  37 /** Strings corresponding to enum perf_type_id. */
  38 static const char * const event_type_descriptors[] = {
  39         "Hardware event",
  40         "Software event",
  41         "Tracepoint event",
  42         "Hardware cache event",
  43         "Raw event descriptor",
  44         "Hardware breakpoint",
  45 };
  46
  47 /*
  48  * Print the events from <debugfs_mount_point>/tracing/events
  49  */
  50 void print_tracepoint_events(const struct print_callbacks *print_cb __maybe_unused, void *print_state __maybe_unused)
  51 {
  52         char *events_path = get_tracing_file("events");
  53         int events_fd = open(events_path, O_PATH);
  54         struct dirent **sys_namelist = NULL;
  55         int sys_items;
  56
  57         if (events_fd < 0) {
  58                 pr_err("Error: failed to open tracing events directory\n");
  59                 pr_err("%s: %s\n", events_path, strerror(errno));
  60                 return;
  61         }
  62         put_tracing_file(events_path);
  63
  64         sys_items = tracing_events__scandir_alphasort(&sys_namelist);
  65
  66         for (int i = 0; i < sys_items; i++) {
  67                 struct dirent *sys_dirent = sys_namelist[i];
  68                 struct dirent **evt_namelist = NULL;
  69                 int dir_fd;
  70                 int evt_items;
  71
  72                 if (sys_dirent->d_type != DT_DIR ||
  73                     !strcmp(sys_dirent->d_name, ".") ||
  74                     !strcmp(sys_dirent->d_name, ".."))
  75                         goto next_sys;
  76
  77                 dir_fd = openat(events_fd, sys_dirent->d_name, O_PATH);
  78                 if (dir_fd < 0)
  79                         goto next_sys;
  80
  81                 evt_items = scandirat(events_fd, sys_dirent->d_name, &evt_namelist, NULL, alphasort);
  82                 for (int j = 0; j < evt_items; j++) {
  83                         /*
  84                          * Buffer sized at twice the max filename length + 1
  85                          * separator + 1 \0 terminator.
  86                          */
  87                         char buf[NAME_MAX * 2 + 2];
  88                         /* 16 possible hex digits and 22 other characters and \0. */
  89                         char encoding[16 + 22];
  90                         struct dirent *evt_dirent = evt_namelist[j];
  91                         struct io id;
  92                         __u64 config;
  93
  94                         if (evt_dirent->d_type != DT_DIR ||
  95                             !strcmp(evt_dirent->d_name, ".") ||
  96                             !strcmp(evt_dirent->d_name, ".."))
  97                                 goto next_evt;
  98
  99                         snprintf(buf, sizeof(buf), "%s/id", evt_dirent->d_name);
 100                         io__init(&id, openat(dir_fd, buf, O_RDONLY), buf, sizeof(buf));
 101
 102                         if (id.fd < 0)
 103                                 goto next_evt;
 104
 105                         if (io__get_dec(&id, &config) < 0) {
 106                                 close(id.fd);
 107                                 goto next_evt;
 108                         }
 109                         close(id.fd);
 110
 111                         snprintf(buf, sizeof(buf), "%s:%s",
 112                                  sys_dirent->d_name, evt_dirent->d_name);
 113                         snprintf(encoding, sizeof(encoding), "tracepoint/config=0x%llx/", config);
 114                         print_cb->print_event(print_state,
 115                                         /*topic=*/NULL,
 116                                         /*pmu_name=*/NULL, /* really "tracepoint" */
 117                                         /*event_name=*/buf,
 118                                         /*event_alias=*/NULL,
 119                                         /*scale_unit=*/NULL,
 120                                         /*deprecated=*/false,
 121                                         "Tracepoint event",
 122                                         /*desc=*/NULL,
 123                                         /*long_desc=*/NULL,
 124                                         encoding);
 125 next_evt:
 126                         free(evt_namelist[j]);
 127                 }
 128                 close(dir_fd);
 129                 free(evt_namelist);
 130 next_sys:
 131                 free(sys_namelist[i]);
 132         }
 133
 134         free(sys_namelist);
 135         close(events_fd);
 136 }
 137
 138 void print_sdt_events(const struct print_callbacks *print_cb, void *print_state)
 139 {
 140         struct strlist *bidlist, *sdtlist;
 141         struct str_node *bid_nd, *sdt_name, *next_sdt_name;
 142         const char *last_sdt_name = NULL;
 143
 144         /*
 145          * The implicitly sorted sdtlist will hold the tracepoint name followed
 146          * by @<buildid>. If the tracepoint name is unique (determined by
 147          * looking at the adjacent nodes) the @<buildid> is dropped otherwise
 148          * the executable path and buildid are added to the name.
 149          */
 150         sdtlist = strlist__new(NULL, NULL);
 151         if (!sdtlist) {
 152                 pr_debug("Failed to allocate new strlist for SDT\n");
 153                 return;
 154         }
 155         bidlist = build_id_cache__list_all(true);
 156         if (!bidlist) {
 157                 pr_debug("Failed to get buildids: %d\n", errno);
 158                 return;
 159         }
 160         strlist__for_each_entry(bid_nd, bidlist) {
 161                 struct probe_cache *pcache;
 162                 struct probe_cache_entry *ent;
 163
 164                 pcache = probe_cache__new(bid_nd->s, NULL);
 165                 if (!pcache)
 166                         continue;
 167                 list_for_each_entry(ent, &pcache->entries, node) {
 168                         char buf[1024];
 169
 170                         snprintf(buf, sizeof(buf), "%s:%s@%s",
 171                                  ent->pev.group, ent->pev.event, bid_nd->s);
 172                         strlist__add(sdtlist, buf);
 173                 }
 174                 probe_cache__delete(pcache);
 175         }
 176         strlist__delete(bidlist);
 177
 178         strlist__for_each_entry(sdt_name, sdtlist) {
 179                 bool show_detail = false;
 180                 char *bid = strchr(sdt_name->s, '@');
 181                 char *evt_name = NULL;
 182
 183                 if (bid)
 184                         *(bid++) = '\0';
 185
 186                 if (last_sdt_name && !strcmp(last_sdt_name, sdt_name->s)) {
 187                         show_detail = true;
 188                 } else {
 189                         next_sdt_name = strlist__next(sdt_name);
 190                         if (next_sdt_name) {
 191                                 char *bid2 = strchr(next_sdt_name->s, '@');
 192
 193                                 if (bid2)
 194                                         *bid2 = '\0';
 195                                 if (strcmp(sdt_name->s, next_sdt_name->s) == 0)
 196                                         show_detail = true;
 197                                 if (bid2)
 198                                         *bid2 = '@';
 199                         }
 200                 }
 201                 last_sdt_name = sdt_name->s;
 202
 203                 if (show_detail) {
 204                         char *path = build_id_cache__origname(bid);
 205
 206                         if (path) {
 207                                 if (asprintf(&evt_name, "%s@%s(%.12s)", sdt_name->s, path, bid) < 0)
 208                                         evt_name = NULL;
 209                                 free(path);
 210                         }
 211                 }
 212                 print_cb->print_event(print_state,
 213                                 /*topic=*/NULL,
 214                                 /*pmu_name=*/NULL,
 215                                 evt_name ?: sdt_name->s,
 216                                 /*event_alias=*/NULL,
 217                                 /*deprecated=*/false,
 218                                 /*scale_unit=*/NULL,
 219                                 "SDT event",
 220                                 /*desc=*/NULL,
 221                                 /*long_desc=*/NULL,
 222                                 /*encoding_desc=*/NULL);
 223
 224                 free(evt_name);
 225         }
 226         strlist__delete(sdtlist);
 227 }
 228
 229 bool is_event_supported(u8 type, u64 config)
 230 {
 231         bool ret = true;
 232         struct evsel *evsel;
 233         struct perf_event_attr attr = {
 234                 .type = type,
 235                 .config = config,
 236                 .disabled = 1,
 237         };
 238         struct perf_thread_map *tmap = thread_map__new_by_tid(0);
 239
 240         if (tmap == NULL)
 241                 return false;
 242
 243         evsel = evsel__new(&attr);
 244         if (evsel) {
 245                 ret = evsel__open(evsel, NULL, tmap) >= 0;
 246
 247                 if (!ret) {
 248                         /*
 249                          * The event may fail to open if the paranoid value
 250                          * /proc/sys/kernel/perf_event_paranoid is set to 2
 251                          * Re-run with exclude_kernel set; we don't do that by
 252                          * default as some ARM machines do not support it.
 253                          */
 254                         evsel->core.attr.exclude_kernel = 1;
 255                         ret = evsel__open(evsel, NULL, tmap) >= 0;
 256                 }
 257
 258                 if (!ret) {
 259                         /*
 260                          * The event may fail to open if the PMU requires
 261                          * exclude_guest to be set (e.g. as the Apple M1 PMU
 262                          * requires).
 263                          * Re-run with exclude_guest set; we don't do that by
 264                          * default as it's equally legitimate for another PMU
 265                          * driver to require that exclude_guest is clear.
 266                          */
 267                         evsel->core.attr.exclude_guest = 1;
 268                         ret = evsel__open(evsel, NULL, tmap) >= 0;
 269                 }
 270
 271                 evsel__delete(evsel);
 272         }
 273
 274         perf_thread_map__put(tmap);
 275         return ret;
 276 }
 277
 278 int print_hwcache_events(const struct print_callbacks *print_cb, void *print_state)
 279 {
 280         struct perf_pmu *pmu = NULL;
 281         const char *event_type_descriptor = event_type_descriptors[PERF_TYPE_HW_CACHE];
 282
 283         /*
 284          * Only print core PMUs, skipping uncore for performance and
 285          * PERF_TYPE_SOFTWARE that can succeed in opening legacy cache evenst.
 286          */
 287         while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
 288                 if (pmu->is_uncore || pmu->type == PERF_TYPE_SOFTWARE)
 289                         continue;
 290
 291                 for (int type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
 292                         for (int op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
 293                                 /* skip invalid cache type */
 294                                 if (!evsel__is_cache_op_valid(type, op))
 295                                         continue;
 296
 297                                 for (int res = 0; res < PERF_COUNT_HW_CACHE_RESULT_MAX; res++) {
 298                                         char name[64];
 299                                         char alias_name[128];
 300                                         __u64 config;
 301                                         int ret;
 302
 303                                         __evsel__hw_cache_type_op_res_name(type, op, res,
 304                                                                         name, sizeof(name));
 305
 306                                         ret = parse_events__decode_legacy_cache(name, pmu->type,
 307                                                                                 &config);
 308                                         if (ret || !is_event_supported(PERF_TYPE_HW_CACHE, config))
 309                                                 continue;
 310                                         snprintf(alias_name, sizeof(alias_name), "%s/%s/",
 311                                                  pmu->name, name);
 312                                         print_cb->print_event(print_state,
 313                                                         "cache",
 314                                                         pmu->name,
 315                                                         name,
 316                                                         alias_name,
 317                                                         /*scale_unit=*/NULL,
 318                                                         /*deprecated=*/false,
 319                                                         event_type_descriptor,
 320                                                         /*desc=*/NULL,
 321                                                         /*long_desc=*/NULL,
 322                                                         /*encoding_desc=*/NULL);
 323                                 }
 324                         }
 325                 }
 326         }
 327         return 0;
 328 }
 329
 330 void print_symbol_events(const struct print_callbacks *print_cb, void *print_state,
 331                          unsigned int type, const struct event_symbol *syms,
 332                          unsigned int max)
 333 {
 334         struct strlist *evt_name_list = strlist__new(NULL, NULL);
 335         struct str_node *nd;
 336
 337         if (!evt_name_list) {
 338                 pr_debug("Failed to allocate new strlist for symbol events\n");
 339                 return;
 340         }
 341         for (unsigned int i = 0; i < max; i++) {
 342                 /*
 343                  * New attr.config still not supported here, the latest
 344                  * example was PERF_COUNT_SW_CGROUP_SWITCHES
 345                  */
 346                 if (syms[i].symbol == NULL)
 347                         continue;
 348
 349                 if (!is_event_supported(type, i))
 350                         continue;
 351
 352                 if (strlen(syms[i].alias)) {
 353                         char name[MAX_NAME_LEN];
 354
 355                         snprintf(name, MAX_NAME_LEN, "%s OR %s", syms[i].symbol, syms[i].alias);
 356                         strlist__add(evt_name_list, name);
 357                 } else
 358                         strlist__add(evt_name_list, syms[i].symbol);
 359         }
 360
 361         strlist__for_each_entry(nd, evt_name_list) {
 362                 char *alias = strstr(nd->s, " OR ");
 363
 364                 if (alias) {
 365                         *alias = '\0';
 366                         alias += 4;
 367                 }
 368                 print_cb->print_event(print_state,
 369                                 /*topic=*/NULL,
 370                                 /*pmu_name=*/NULL,
 371                                 nd->s,
 372                                 alias,
 373                                 /*scale_unit=*/NULL,
 374                                 /*deprecated=*/false,
 375                                 event_type_descriptors[type],
 376                                 /*desc=*/NULL,
 377                                 /*long_desc=*/NULL,
 378                                 /*encoding_desc=*/NULL);
 379         }
 380         strlist__delete(evt_name_list);
 381 }
 382
 383 /*
 384  * Print the help text for the event symbols:
 385  */
 386 void print_events(const struct print_callbacks *print_cb, void *print_state)
 387 {
 388         print_symbol_events(print_cb, print_state, PERF_TYPE_HARDWARE,
 389                         event_symbols_hw, PERF_COUNT_HW_MAX);
 390         print_symbol_events(print_cb, print_state, PERF_TYPE_SOFTWARE,
 391                         event_symbols_sw, PERF_COUNT_SW_MAX);
 392
 393         print_hwcache_events(print_cb, print_state);
 394
 395         perf_pmus__print_pmu_events(print_cb, print_state);
 396
 397         print_cb->print_event(print_state,
 398                         /*topic=*/NULL,
 399                         /*pmu_name=*/NULL,
 400                         "rNNN",
 401                         /*event_alias=*/NULL,
 402                         /*scale_unit=*/NULL,
 403                         /*deprecated=*/false,
 404                         event_type_descriptors[PERF_TYPE_RAW],
 405                         /*desc=*/NULL,
 406                         /*long_desc=*/NULL,
 407                         /*encoding_desc=*/NULL);
 408
 409         perf_pmus__print_raw_pmu_events(print_cb, print_state);
 410
 411         print_cb->print_event(print_state,
 412                         /*topic=*/NULL,
 413                         /*pmu_name=*/NULL,
 414                         "mem:<addr>[/len][:access]",
 415                         /*scale_unit=*/NULL,
 416                         /*event_alias=*/NULL,
 417                         /*deprecated=*/false,
 418                         event_type_descriptors[PERF_TYPE_BREAKPOINT],
 419                         /*desc=*/NULL,
 420                         /*long_desc=*/NULL,
 421                         /*encoding_desc=*/NULL);
 422
 423         print_tracepoint_events(print_cb, print_state);
 424
 425         print_sdt_events(print_cb, print_state);
 426
 427         metricgroup__print(print_cb, print_state);
 428
 429         print_libpfm_events(print_cb, print_state);
 430 }