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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 | // SPDX-License-Identifier: GPL-2.0 /* * Support for libpfm4 event encoding. * * Copyright 2020 Google LLC. */ #include "util/cpumap.h" #include "util/debug.h" #include "util/event.h" #include "util/evlist.h" #include "util/evsel.h" #include "util/parse-events.h" #include "util/pmus.h" #include "util/pfm.h" #include "util/strbuf.h" #include "util/thread_map.h" #include <string.h> #include <linux/kernel.h> #include <perfmon/pfmlib_perf_event.h> static void libpfm_initialize(void) { int ret; ret = pfm_initialize(); if (ret != PFM_SUCCESS) { ui__warning("libpfm failed to initialize: %s\n", pfm_strerror(ret)); } } int parse_libpfm_events_option(const struct option *opt, const char *str, int unset __maybe_unused) { struct evlist *evlist = *(struct evlist **)opt->value; struct perf_event_attr attr; struct perf_pmu *pmu; struct evsel *evsel, *grp_leader = NULL; char *p, *q, *p_orig; const char *sep; int grp_evt = -1; int ret; libpfm_initialize(); p_orig = p = strdup(str); if (!p) return -1; /* * force loading of the PMU list */ perf_pmus__scan(NULL); for (q = p; strsep(&p, ",{}"); q = p) { sep = p ? str + (p - p_orig - 1) : ""; if (*sep == '{') { if (grp_evt > -1) { ui__error( "nested event groups not supported\n"); goto error; } grp_evt++; } /* no event */ if (*q == '\0') { if (*sep == '}') { if (grp_evt < 0) { ui__error("cannot close a non-existing event group\n"); goto error; } grp_evt--; } continue; } memset(&attr, 0, sizeof(attr)); event_attr_init(&attr); ret = pfm_get_perf_event_encoding(q, PFM_PLM0|PFM_PLM3, &attr, NULL, NULL); if (ret != PFM_SUCCESS) { ui__error("failed to parse event %s : %s\n", str, pfm_strerror(ret)); goto error; } pmu = perf_pmus__find_by_type((unsigned int)attr.type); evsel = parse_events__add_event(evlist->core.nr_entries, &attr, q, /*metric_id=*/NULL, pmu); if (evsel == NULL) goto error; evsel->is_libpfm_event = true; evlist__add(evlist, evsel); if (grp_evt == 0) grp_leader = evsel; if (grp_evt > -1) { evsel__set_leader(evsel, grp_leader); grp_leader->core.nr_members++; grp_evt++; } if (*sep == '}') { if (grp_evt < 0) { ui__error( "cannot close a non-existing event group\n"); goto error; } grp_leader = NULL; grp_evt = -1; } } free(p_orig); return 0; error: free(p_orig); return -1; } static bool is_libpfm_event_supported(const char *name, struct perf_cpu_map *cpus, struct perf_thread_map *threads) { struct perf_pmu *pmu; struct evsel *evsel; struct perf_event_attr attr = {}; bool result = true; int ret; ret = pfm_get_perf_event_encoding(name, PFM_PLM0|PFM_PLM3, &attr, NULL, NULL); if (ret != PFM_SUCCESS) return false; pmu = perf_pmus__find_by_type((unsigned int)attr.type); evsel = parse_events__add_event(0, &attr, name, /*metric_id=*/NULL, pmu); if (evsel == NULL) return false; evsel->is_libpfm_event = true; ret = evsel__open(evsel, cpus, threads); if (ret == -EACCES) { /* * This happens if the paranoid value * /proc/sys/kernel/perf_event_paranoid is set to 2 * Re-run with exclude_kernel set; we don't do that * by default as some ARM machines do not support it. * */ evsel->core.attr.exclude_kernel = 1; ret = evsel__open(evsel, cpus, threads); } if (ret < 0) result = false; evsel__close(evsel); evsel__delete(evsel); return result; } static const char *srcs[PFM_ATTR_CTRL_MAX] = { [PFM_ATTR_CTRL_UNKNOWN] = "???", [PFM_ATTR_CTRL_PMU] = "PMU", [PFM_ATTR_CTRL_PERF_EVENT] = "perf_event", }; static void print_attr_flags(struct strbuf *buf, const pfm_event_attr_info_t *info) { if (info->is_dfl) strbuf_addf(buf, "[default] "); if (info->is_precise) strbuf_addf(buf, "[precise] "); } static void print_libpfm_event(const struct print_callbacks *print_cb, void *print_state, const pfm_pmu_info_t *pinfo, const pfm_event_info_t *info, struct strbuf *buf) { int j, ret; char topic[80], name[80]; struct perf_cpu_map *cpus = perf_cpu_map__empty_new(1); struct perf_thread_map *threads = thread_map__new_by_tid(0); strbuf_setlen(buf, 0); snprintf(topic, sizeof(topic), "pfm %s", pinfo->name); snprintf(name, sizeof(name), "%s::%s", pinfo->name, info->name); strbuf_addf(buf, "Code: 0x%"PRIx64"\n", info->code); pfm_for_each_event_attr(j, info) { pfm_event_attr_info_t ainfo; const char *src; ainfo.size = sizeof(ainfo); ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo); if (ret != PFM_SUCCESS) continue; if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX) ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN; src = srcs[ainfo.ctrl]; switch (ainfo.type) { case PFM_ATTR_UMASK: /* Ignore for now */ break; case PFM_ATTR_MOD_BOOL: strbuf_addf(buf, " Modif: %s: [%s] : %s (boolean)\n", src, ainfo.name, ainfo.desc); break; case PFM_ATTR_MOD_INTEGER: strbuf_addf(buf, " Modif: %s: [%s] : %s (integer)\n", src, ainfo.name, ainfo.desc); break; case PFM_ATTR_NONE: case PFM_ATTR_RAW_UMASK: case PFM_ATTR_MAX: default: strbuf_addf(buf, " Attr: %s: [%s] : %s\n", src, ainfo.name, ainfo.desc); } } if (is_libpfm_event_supported(name, cpus, threads)) { print_cb->print_event(print_state, pinfo->name, topic, name, info->equiv, /*scale_unit=*/NULL, /*deprecated=*/NULL, "PFM event", info->desc, /*long_desc=*/NULL, /*encoding_desc=*/buf->buf); } pfm_for_each_event_attr(j, info) { pfm_event_attr_info_t ainfo; const char *src; strbuf_setlen(buf, 0); ainfo.size = sizeof(ainfo); ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo); if (ret != PFM_SUCCESS) continue; if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX) ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN; src = srcs[ainfo.ctrl]; if (ainfo.type == PFM_ATTR_UMASK) { strbuf_addf(buf, "Umask: 0x%02"PRIx64" : %s: ", ainfo.code, src); print_attr_flags(buf, &ainfo); snprintf(name, sizeof(name), "%s::%s:%s", pinfo->name, info->name, ainfo.name); if (!is_libpfm_event_supported(name, cpus, threads)) continue; print_cb->print_event(print_state, pinfo->name, topic, name, /*alias=*/NULL, /*scale_unit=*/NULL, /*deprecated=*/NULL, "PFM event", ainfo.desc, /*long_desc=*/NULL, /*encoding_desc=*/buf->buf); } } perf_cpu_map__put(cpus); perf_thread_map__put(threads); } void print_libpfm_events(const struct print_callbacks *print_cb, void *print_state) { pfm_event_info_t info; pfm_pmu_info_t pinfo; int p, ret; struct strbuf storage; libpfm_initialize(); /* initialize to zero to indicate ABI version */ info.size = sizeof(info); pinfo.size = sizeof(pinfo); strbuf_init(&storage, 2048); pfm_for_all_pmus(p) { ret = pfm_get_pmu_info(p, &pinfo); if (ret != PFM_SUCCESS) continue; /* only print events that are supported by host HW */ if (!pinfo.is_present) continue; /* handled by perf directly */ if (pinfo.pmu == PFM_PMU_PERF_EVENT) continue; for (int i = pinfo.first_event; i != -1; i = pfm_get_event_next(i)) { ret = pfm_get_event_info(i, PFM_OS_PERF_EVENT_EXT, &info); if (ret != PFM_SUCCESS) continue; print_libpfm_event(print_cb, print_state, &pinfo, &info, &storage); } } strbuf_release(&storage); } |