tools/perf/util/pfm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Support for libpfm4 event encoding.
   4  *
   5  * Copyright 2020 Google LLC.
   6  */
   7 #include "util/cpumap.h"
   8 #include "util/debug.h"
   9 #include "util/event.h"
  10 #include "util/evlist.h"
  11 #include "util/evsel.h"
  12 #include "util/parse-events.h"
  13 #include "util/pmu.h"
  14 #include "util/pfm.h"
  15
  16 #include <string.h>
  17 #include <linux/kernel.h>
  18 #include <perfmon/pfmlib_perf_event.h>
  19
  20 static void libpfm_initialize(void)
  21 {
  22         int ret;
  23
  24         ret = pfm_initialize();
  25         if (ret != PFM_SUCCESS) {
  26                 ui__warning("libpfm failed to initialize: %s\n",
  27                         pfm_strerror(ret));
  28         }
  29 }
  30
  31 int parse_libpfm_events_option(const struct option *opt, const char *str,
  32                         int unset __maybe_unused)
  33 {
  34         struct evlist *evlist = *(struct evlist **)opt->value;
  35         struct perf_event_attr attr;
  36         struct perf_pmu *pmu;
  37         struct evsel *evsel, *grp_leader = NULL;
  38         char *p, *q, *p_orig;
  39         const char *sep;
  40         int grp_evt = -1;
  41         int ret;
  42
  43         libpfm_initialize();
  44
  45         p_orig = p = strdup(str);
  46         if (!p)
  47                 return -1;
  48         /*
  49          * force loading of the PMU list
  50          */
  51         perf_pmu__scan(NULL);
  52
  53         for (q = p; strsep(&p, ",{}"); q = p) {
  54                 sep = p ? str + (p - p_orig - 1) : "";
  55                 if (*sep == '{') {
  56                         if (grp_evt > -1) {
  57                                 ui__error(
  58                                         "nested event groups not supported\n");
  59                                 goto error;
  60                         }
  61                         grp_evt++;
  62                 }
  63
  64                 /* no event */
  65                 if (*q == '\0')
  66                         continue;
  67
  68                 memset(&attr, 0, sizeof(attr));
  69                 event_attr_init(&attr);
  70
  71                 ret = pfm_get_perf_event_encoding(q, PFM_PLM0|PFM_PLM3,
  72                                                 &attr, NULL, NULL);
  73
  74                 if (ret != PFM_SUCCESS) {
  75                         ui__error("failed to parse event %s : %s\n", str,
  76                                   pfm_strerror(ret));
  77                         goto error;
  78                 }
  79
  80                 pmu = perf_pmu__find_by_type((unsigned int)attr.type);
  81                 evsel = parse_events__add_event(evlist->core.nr_entries,
  82                                                 &attr, q, pmu);
  83                 if (evsel == NULL)
  84                         goto error;
  85
  86                 evsel->is_libpfm_event = true;
  87
  88                 evlist__add(evlist, evsel);
  89
  90                 if (grp_evt == 0)
  91                         grp_leader = evsel;
  92
  93                 if (grp_evt > -1) {
  94                         evsel->leader = grp_leader;
  95                         grp_leader->core.nr_members++;
  96                         grp_evt++;
  97                 }
  98
  99                 if (*sep == '}') {
 100                         if (grp_evt < 0) {
 101                                 ui__error(
 102                                    "cannot close a non-existing event group\n");
 103                                 goto error;
 104                         }
 105                         evlist->nr_groups++;
 106                         grp_leader = NULL;
 107                         grp_evt = -1;
 108                 }
 109         }
 110         return 0;
 111 error:
 112         free(p_orig);
 113         return -1;
 114 }
 115
 116 static const char *srcs[PFM_ATTR_CTRL_MAX] = {
 117         [PFM_ATTR_CTRL_UNKNOWN] = "???",
 118         [PFM_ATTR_CTRL_PMU] = "PMU",
 119         [PFM_ATTR_CTRL_PERF_EVENT] = "perf_event",
 120 };
 121
 122 static void
 123 print_attr_flags(pfm_event_attr_info_t *info)
 124 {
 125         int n = 0;
 126
 127         if (info->is_dfl) {
 128                 printf("[default] ");
 129                 n++;
 130         }
 131
 132         if (info->is_precise) {
 133                 printf("[precise] ");
 134                 n++;
 135         }
 136
 137         if (!n)
 138                 printf("- ");
 139 }
 140
 141 static void
 142 print_libpfm_events_detailed(pfm_event_info_t *info, bool long_desc)
 143 {
 144         pfm_event_attr_info_t ainfo;
 145         const char *src;
 146         int j, ret;
 147
 148         ainfo.size = sizeof(ainfo);
 149
 150         printf("  %s\n", info->name);
 151         printf("    [%s]\n", info->desc);
 152         if (long_desc) {
 153                 if (info->equiv)
 154                         printf("      Equiv: %s\n", info->equiv);
 155
 156                 printf("      Code  : 0x%"PRIx64"\n", info->code);
 157         }
 158         pfm_for_each_event_attr(j, info) {
 159                 ret = pfm_get_event_attr_info(info->idx, j,
 160                                               PFM_OS_PERF_EVENT_EXT, &ainfo);
 161                 if (ret != PFM_SUCCESS)
 162                         continue;
 163
 164                 if (ainfo.type == PFM_ATTR_UMASK) {
 165                         printf("      %s:%s\n", info->name, ainfo.name);
 166                         printf("        [%s]\n", ainfo.desc);
 167                 }
 168
 169                 if (!long_desc)
 170                         continue;
 171
 172                 if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX)
 173                         ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN;
 174
 175                 src = srcs[ainfo.ctrl];
 176                 switch (ainfo.type) {
 177                 case PFM_ATTR_UMASK:
 178                         printf("        Umask : 0x%02"PRIx64" : %s: ",
 179                                 ainfo.code, src);
 180                         print_attr_flags(&ainfo);
 181                         putchar('\n');
 182                         break;
 183                 case PFM_ATTR_MOD_BOOL:
 184                         printf("      Modif : %s: [%s] : %s (boolean)\n", src,
 185                                 ainfo.name, ainfo.desc);
 186                         break;
 187                 case PFM_ATTR_MOD_INTEGER:
 188                         printf("      Modif : %s: [%s] : %s (integer)\n", src,
 189                                 ainfo.name, ainfo.desc);
 190                         break;
 191                 case PFM_ATTR_NONE:
 192                 case PFM_ATTR_RAW_UMASK:
 193                 case PFM_ATTR_MAX:
 194                 default:
 195                         printf("      Attr  : %s: [%s] : %s\n", src,
 196                                 ainfo.name, ainfo.desc);
 197                 }
 198         }
 199 }
 200
 201 /*
 202  * list all pmu::event:umask, pmu::event
 203  * printed events may not be all valid combinations of umask for an event
 204  */
 205 static void
 206 print_libpfm_events_raw(pfm_pmu_info_t *pinfo, pfm_event_info_t *info)
 207 {
 208         pfm_event_attr_info_t ainfo;
 209         int j, ret;
 210         bool has_umask = false;
 211
 212         ainfo.size = sizeof(ainfo);
 213
 214         pfm_for_each_event_attr(j, info) {
 215                 ret = pfm_get_event_attr_info(info->idx, j,
 216                                               PFM_OS_PERF_EVENT_EXT, &ainfo);
 217                 if (ret != PFM_SUCCESS)
 218                         continue;
 219
 220                 if (ainfo.type != PFM_ATTR_UMASK)
 221                         continue;
 222
 223                 printf("%s::%s:%s\n", pinfo->name, info->name, ainfo.name);
 224                 has_umask = true;
 225         }
 226         if (!has_umask)
 227                 printf("%s::%s\n", pinfo->name, info->name);
 228 }
 229
 230 void print_libpfm_events(bool name_only, bool long_desc)
 231 {
 232         pfm_event_info_t info;
 233         pfm_pmu_info_t pinfo;
 234         int i, p, ret;
 235
 236         libpfm_initialize();
 237
 238         /* initialize to zero to indicate ABI version */
 239         info.size  = sizeof(info);
 240         pinfo.size = sizeof(pinfo);
 241
 242         if (!name_only)
 243                 puts("\nList of pre-defined events (to be used in --pfm-events):\n");
 244
 245         pfm_for_all_pmus(p) {
 246                 bool printed_pmu = false;
 247
 248                 ret = pfm_get_pmu_info(p, &pinfo);
 249                 if (ret != PFM_SUCCESS)
 250                         continue;
 251
 252                 /* only print events that are supported by host HW */
 253                 if (!pinfo.is_present)
 254                         continue;
 255
 256                 /* handled by perf directly */
 257                 if (pinfo.pmu == PFM_PMU_PERF_EVENT)
 258                         continue;
 259
 260                 for (i = pinfo.first_event; i != -1;
 261                      i = pfm_get_event_next(i)) {
 262
 263                         ret = pfm_get_event_info(i, PFM_OS_PERF_EVENT_EXT,
 264                                                 &info);
 265                         if (ret != PFM_SUCCESS)
 266                                 continue;
 267
 268                         if (!name_only && !printed_pmu) {
 269                                 printf("%s:\n", pinfo.name);
 270                                 printed_pmu = true;
 271                         }
 272
 273                         if (!name_only)
 274                                 print_libpfm_events_detailed(&info, long_desc);
 275                         else
 276                                 print_libpfm_events_raw(&pinfo, &info);
 277                 }
 278                 if (!name_only && printed_pmu)
 279                         putchar('\n');
 280         }
 281 }