644 lines
15 KiB
C
644 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <perf/evlist.h>
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#include <perf/evsel.h>
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#include <linux/bitops.h>
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#include <linux/list.h>
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#include <linux/hash.h>
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#include <sys/ioctl.h>
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#include <internal/evlist.h>
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#include <internal/evsel.h>
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#include <internal/xyarray.h>
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#include <internal/mmap.h>
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#include <internal/cpumap.h>
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#include <internal/threadmap.h>
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#include <internal/lib.h>
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#include <linux/zalloc.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <poll.h>
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#include <sys/mman.h>
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#include <perf/cpumap.h>
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#include <perf/threadmap.h>
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#include <api/fd/array.h>
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void perf_evlist__init(struct perf_evlist *evlist)
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{
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INIT_LIST_HEAD(&evlist->entries);
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evlist->nr_entries = 0;
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fdarray__init(&evlist->pollfd, 64);
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perf_evlist__reset_id_hash(evlist);
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}
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static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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/*
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* We already have cpus for evsel (via PMU sysfs) so
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* keep it, if there's no target cpu list defined.
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*/
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if (!evsel->own_cpus || evlist->has_user_cpus) {
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perf_cpu_map__put(evsel->cpus);
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evsel->cpus = perf_cpu_map__get(evlist->cpus);
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} else if (!evsel->system_wide && perf_cpu_map__empty(evlist->cpus)) {
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perf_cpu_map__put(evsel->cpus);
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evsel->cpus = perf_cpu_map__get(evlist->cpus);
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} else if (evsel->cpus != evsel->own_cpus) {
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perf_cpu_map__put(evsel->cpus);
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evsel->cpus = perf_cpu_map__get(evsel->own_cpus);
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}
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perf_thread_map__put(evsel->threads);
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evsel->threads = perf_thread_map__get(evlist->threads);
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evlist->all_cpus = perf_cpu_map__merge(evlist->all_cpus, evsel->cpus);
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}
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static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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perf_evlist__for_each_evsel(evlist, evsel)
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__perf_evlist__propagate_maps(evlist, evsel);
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}
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void perf_evlist__add(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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list_add_tail(&evsel->node, &evlist->entries);
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evlist->nr_entries += 1;
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__perf_evlist__propagate_maps(evlist, evsel);
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}
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void perf_evlist__remove(struct perf_evlist *evlist,
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struct perf_evsel *evsel)
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{
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list_del_init(&evsel->node);
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evlist->nr_entries -= 1;
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}
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struct perf_evlist *perf_evlist__new(void)
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{
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struct perf_evlist *evlist = zalloc(sizeof(*evlist));
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if (evlist != NULL)
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perf_evlist__init(evlist);
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return evlist;
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}
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struct perf_evsel *
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perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
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{
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struct perf_evsel *next;
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if (!prev) {
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next = list_first_entry(&evlist->entries,
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struct perf_evsel,
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node);
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} else {
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next = list_next_entry(prev, node);
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}
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/* Empty list is noticed here so don't need checking on entry. */
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if (&next->node == &evlist->entries)
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return NULL;
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return next;
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}
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static void perf_evlist__purge(struct perf_evlist *evlist)
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{
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struct perf_evsel *pos, *n;
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perf_evlist__for_each_entry_safe(evlist, n, pos) {
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list_del_init(&pos->node);
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perf_evsel__delete(pos);
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}
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evlist->nr_entries = 0;
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}
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void perf_evlist__exit(struct perf_evlist *evlist)
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{
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perf_cpu_map__put(evlist->cpus);
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perf_cpu_map__put(evlist->all_cpus);
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perf_thread_map__put(evlist->threads);
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evlist->cpus = NULL;
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evlist->all_cpus = NULL;
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evlist->threads = NULL;
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fdarray__exit(&evlist->pollfd);
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}
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void perf_evlist__delete(struct perf_evlist *evlist)
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{
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if (evlist == NULL)
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return;
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perf_evlist__munmap(evlist);
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perf_evlist__close(evlist);
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perf_evlist__purge(evlist);
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perf_evlist__exit(evlist);
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free(evlist);
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}
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void perf_evlist__set_maps(struct perf_evlist *evlist,
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struct perf_cpu_map *cpus,
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struct perf_thread_map *threads)
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{
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/*
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* Allow for the possibility that one or another of the maps isn't being
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* changed i.e. don't put it. Note we are assuming the maps that are
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* being applied are brand new and evlist is taking ownership of the
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* original reference count of 1. If that is not the case it is up to
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* the caller to increase the reference count.
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*/
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if (cpus != evlist->cpus) {
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perf_cpu_map__put(evlist->cpus);
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evlist->cpus = perf_cpu_map__get(cpus);
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}
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if (threads != evlist->threads) {
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perf_thread_map__put(evlist->threads);
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evlist->threads = perf_thread_map__get(threads);
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}
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if (!evlist->all_cpus && cpus)
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evlist->all_cpus = perf_cpu_map__get(cpus);
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perf_evlist__propagate_maps(evlist);
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}
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int perf_evlist__open(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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int err;
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perf_evlist__for_each_entry(evlist, evsel) {
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err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
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if (err < 0)
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goto out_err;
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}
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return 0;
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out_err:
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perf_evlist__close(evlist);
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return err;
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}
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void perf_evlist__close(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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perf_evlist__for_each_entry_reverse(evlist, evsel)
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perf_evsel__close(evsel);
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}
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void perf_evlist__enable(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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perf_evlist__for_each_entry(evlist, evsel)
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perf_evsel__enable(evsel);
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}
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void perf_evlist__disable(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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perf_evlist__for_each_entry(evlist, evsel)
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perf_evsel__disable(evsel);
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}
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u64 perf_evlist__read_format(struct perf_evlist *evlist)
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{
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struct perf_evsel *first = perf_evlist__first(evlist);
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return first->attr.read_format;
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}
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#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
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static void perf_evlist__id_hash(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, u64 id)
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{
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int hash;
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struct perf_sample_id *sid = SID(evsel, cpu, thread);
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sid->id = id;
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sid->evsel = evsel;
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hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
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hlist_add_head(&sid->node, &evlist->heads[hash]);
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}
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void perf_evlist__reset_id_hash(struct perf_evlist *evlist)
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{
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int i;
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for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
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INIT_HLIST_HEAD(&evlist->heads[i]);
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}
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void perf_evlist__id_add(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, u64 id)
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{
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perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
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evsel->id[evsel->ids++] = id;
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}
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int perf_evlist__id_add_fd(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, int fd)
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{
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u64 read_data[4] = { 0, };
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int id_idx = 1; /* The first entry is the counter value */
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u64 id;
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int ret;
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ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
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if (!ret)
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goto add;
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if (errno != ENOTTY)
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return -1;
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/* Legacy way to get event id.. All hail to old kernels! */
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/*
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* This way does not work with group format read, so bail
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* out in that case.
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*/
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if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
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return -1;
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if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
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read(fd, &read_data, sizeof(read_data)) == -1)
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return -1;
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if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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++id_idx;
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if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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++id_idx;
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id = read_data[id_idx];
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add:
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perf_evlist__id_add(evlist, evsel, cpu, thread, id);
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return 0;
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}
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int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
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{
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int nr_cpus = perf_cpu_map__nr(evlist->cpus);
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int nr_threads = perf_thread_map__nr(evlist->threads);
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int nfds = 0;
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struct perf_evsel *evsel;
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perf_evlist__for_each_entry(evlist, evsel) {
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if (evsel->system_wide)
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nfds += nr_cpus;
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else
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nfds += nr_cpus * nr_threads;
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}
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if (fdarray__available_entries(&evlist->pollfd) < nfds &&
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fdarray__grow(&evlist->pollfd, nfds) < 0)
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return -ENOMEM;
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return 0;
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}
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int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
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void *ptr, short revent, enum fdarray_flags flags)
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{
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int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP, flags);
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if (pos >= 0) {
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evlist->pollfd.priv[pos].ptr = ptr;
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fcntl(fd, F_SETFL, O_NONBLOCK);
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}
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return pos;
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}
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static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
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void *arg __maybe_unused)
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{
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struct perf_mmap *map = fda->priv[fd].ptr;
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if (map)
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perf_mmap__put(map);
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}
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int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
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{
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return fdarray__filter(&evlist->pollfd, revents_and_mask,
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perf_evlist__munmap_filtered, NULL);
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}
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int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
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{
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return fdarray__poll(&evlist->pollfd, timeout);
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}
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static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, bool overwrite)
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{
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int i;
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struct perf_mmap *map;
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map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
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if (!map)
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return NULL;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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struct perf_mmap *prev = i ? &map[i - 1] : NULL;
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/*
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* When the perf_mmap() call is made we grab one refcount, plus
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* one extra to let perf_mmap__consume() get the last
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* events after all real references (perf_mmap__get()) are
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* dropped.
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*
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* Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
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* thus does perf_mmap__get() on it.
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*/
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perf_mmap__init(&map[i], prev, overwrite, NULL);
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}
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return map;
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}
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static void perf_evsel__set_sid_idx(struct perf_evsel *evsel, int idx, int cpu, int thread)
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{
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struct perf_sample_id *sid = SID(evsel, cpu, thread);
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sid->idx = idx;
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sid->cpu = perf_cpu_map__cpu(evsel->cpus, cpu);
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sid->tid = perf_thread_map__pid(evsel->threads, thread);
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}
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static struct perf_mmap*
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perf_evlist__mmap_cb_get(struct perf_evlist *evlist, bool overwrite, int idx)
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{
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struct perf_mmap *maps;
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maps = overwrite ? evlist->mmap_ovw : evlist->mmap;
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if (!maps) {
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maps = perf_evlist__alloc_mmap(evlist, overwrite);
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if (!maps)
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return NULL;
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if (overwrite)
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evlist->mmap_ovw = maps;
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else
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evlist->mmap = maps;
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}
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return &maps[idx];
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}
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#define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y))
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static int
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perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
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int output, int cpu)
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{
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return perf_mmap__mmap(map, mp, output, cpu);
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}
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static void perf_evlist__set_mmap_first(struct perf_evlist *evlist, struct perf_mmap *map,
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bool overwrite)
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{
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if (overwrite)
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evlist->mmap_ovw_first = map;
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else
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evlist->mmap_first = map;
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}
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static int
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mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
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int idx, struct perf_mmap_param *mp, int cpu_idx,
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int thread, int *_output, int *_output_overwrite)
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{
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int evlist_cpu = perf_cpu_map__cpu(evlist->cpus, cpu_idx);
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struct perf_evsel *evsel;
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int revent;
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perf_evlist__for_each_entry(evlist, evsel) {
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bool overwrite = evsel->attr.write_backward;
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struct perf_mmap *map;
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int *output, fd, cpu;
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if (evsel->system_wide && thread)
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continue;
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cpu = perf_cpu_map__idx(evsel->cpus, evlist_cpu);
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if (cpu == -1)
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continue;
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map = ops->get(evlist, overwrite, idx);
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if (map == NULL)
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return -ENOMEM;
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if (overwrite) {
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mp->prot = PROT_READ;
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output = _output_overwrite;
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} else {
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mp->prot = PROT_READ | PROT_WRITE;
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output = _output;
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}
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fd = FD(evsel, cpu, thread);
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if (*output == -1) {
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*output = fd;
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/*
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* The last one will be done at perf_mmap__consume(), so that we
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* make sure we don't prevent tools from consuming every last event in
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* the ring buffer.
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*
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* I.e. we can get the POLLHUP meaning that the fd doesn't exist
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* anymore, but the last events for it are still in the ring buffer,
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* waiting to be consumed.
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*
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* Tools can chose to ignore this at their own discretion, but the
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* evlist layer can't just drop it when filtering events in
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* perf_evlist__filter_pollfd().
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*/
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refcount_set(&map->refcnt, 2);
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if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
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return -1;
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if (!idx)
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perf_evlist__set_mmap_first(evlist, map, overwrite);
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} else {
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if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
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return -1;
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perf_mmap__get(map);
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}
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revent = !overwrite ? POLLIN : 0;
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if (!evsel->system_wide &&
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perf_evlist__add_pollfd(evlist, fd, map, revent, fdarray_flag__default) < 0) {
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perf_mmap__put(map);
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return -1;
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}
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if (evsel->attr.read_format & PERF_FORMAT_ID) {
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if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
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fd) < 0)
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return -1;
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perf_evsel__set_sid_idx(evsel, idx, cpu, thread);
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}
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}
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return 0;
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}
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static int
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mmap_per_thread(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
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struct perf_mmap_param *mp)
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{
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int thread;
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int nr_threads = perf_thread_map__nr(evlist->threads);
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for (thread = 0; thread < nr_threads; thread++) {
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int output = -1;
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int output_overwrite = -1;
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if (ops->idx)
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ops->idx(evlist, mp, thread, false);
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if (mmap_per_evsel(evlist, ops, thread, mp, 0, thread,
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|
&output, &output_overwrite))
|
|
goto out_unmap;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
perf_evlist__munmap(evlist);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
|
|
struct perf_mmap_param *mp)
|
|
{
|
|
int nr_threads = perf_thread_map__nr(evlist->threads);
|
|
int nr_cpus = perf_cpu_map__nr(evlist->cpus);
|
|
int cpu, thread;
|
|
|
|
for (cpu = 0; cpu < nr_cpus; cpu++) {
|
|
int output = -1;
|
|
int output_overwrite = -1;
|
|
|
|
if (ops->idx)
|
|
ops->idx(evlist, mp, cpu, true);
|
|
|
|
for (thread = 0; thread < nr_threads; thread++) {
|
|
if (mmap_per_evsel(evlist, ops, cpu, mp, cpu,
|
|
thread, &output, &output_overwrite))
|
|
goto out_unmap;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
perf_evlist__munmap(evlist);
|
|
return -1;
|
|
}
|
|
|
|
static int perf_evlist__nr_mmaps(struct perf_evlist *evlist)
|
|
{
|
|
int nr_mmaps;
|
|
|
|
nr_mmaps = perf_cpu_map__nr(evlist->cpus);
|
|
if (perf_cpu_map__empty(evlist->cpus))
|
|
nr_mmaps = perf_thread_map__nr(evlist->threads);
|
|
|
|
return nr_mmaps;
|
|
}
|
|
|
|
int perf_evlist__mmap_ops(struct perf_evlist *evlist,
|
|
struct perf_evlist_mmap_ops *ops,
|
|
struct perf_mmap_param *mp)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
const struct perf_cpu_map *cpus = evlist->cpus;
|
|
const struct perf_thread_map *threads = evlist->threads;
|
|
|
|
if (!ops || !ops->get || !ops->mmap)
|
|
return -EINVAL;
|
|
|
|
mp->mask = evlist->mmap_len - page_size - 1;
|
|
|
|
evlist->nr_mmaps = perf_evlist__nr_mmaps(evlist);
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel) {
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
evsel->sample_id == NULL &&
|
|
perf_evsel__alloc_id(evsel, perf_cpu_map__nr(cpus), threads->nr) < 0)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
|
|
return -ENOMEM;
|
|
|
|
if (perf_cpu_map__empty(cpus))
|
|
return mmap_per_thread(evlist, ops, mp);
|
|
|
|
return mmap_per_cpu(evlist, ops, mp);
|
|
}
|
|
|
|
int perf_evlist__mmap(struct perf_evlist *evlist, int pages)
|
|
{
|
|
struct perf_mmap_param mp;
|
|
struct perf_evlist_mmap_ops ops = {
|
|
.get = perf_evlist__mmap_cb_get,
|
|
.mmap = perf_evlist__mmap_cb_mmap,
|
|
};
|
|
|
|
evlist->mmap_len = (pages + 1) * page_size;
|
|
|
|
return perf_evlist__mmap_ops(evlist, &ops, &mp);
|
|
}
|
|
|
|
void perf_evlist__munmap(struct perf_evlist *evlist)
|
|
{
|
|
int i;
|
|
|
|
if (evlist->mmap) {
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
perf_mmap__munmap(&evlist->mmap[i]);
|
|
}
|
|
|
|
if (evlist->mmap_ovw) {
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
perf_mmap__munmap(&evlist->mmap_ovw[i]);
|
|
}
|
|
|
|
zfree(&evlist->mmap);
|
|
zfree(&evlist->mmap_ovw);
|
|
}
|
|
|
|
struct perf_mmap*
|
|
perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map,
|
|
bool overwrite)
|
|
{
|
|
if (map)
|
|
return map->next;
|
|
|
|
return overwrite ? evlist->mmap_ovw_first : evlist->mmap_first;
|
|
}
|