284 lines
6.4 KiB
C
284 lines
6.4 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 <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 <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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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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INIT_LIST_HEAD(&evlist->entries);
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evlist->nr_entries = 0;
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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->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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}
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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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void perf_evlist__delete(struct perf_evlist *evlist)
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{
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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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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__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)
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{
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int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
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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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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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