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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/util/pfm.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/pfm.c')
-rw-r--r-- | tools/perf/util/pfm.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c new file mode 100644 index 0000000000..862e4a6898 --- /dev/null +++ b/tools/perf/util/pfm.c @@ -0,0 +1,309 @@ +// 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; + + if (evsel__open(evsel, cpus, threads) < 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); +} |