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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
- *
- * Parts came from builtin-{top,stat,record}.c, see those files for further
- * copyright notes.
- */
- #include <api/fs/fs.h>
- #include <errno.h>
- #include <inttypes.h>
- #include <poll.h>
- #include "cpumap.h"
- #include "util/mmap.h"
- #include "thread_map.h"
- #include "target.h"
- #include "evlist.h"
- #include "evsel.h"
- #include "debug.h"
- #include "units.h"
- #include <internal/lib.h> // page_size
- #include "affinity.h"
- #include "../perf.h"
- #include "asm/bug.h"
- #include "bpf-event.h"
- #include "util/string2.h"
- #include "util/perf_api_probe.h"
- #include <signal.h>
- #include <unistd.h>
- #include <sched.h>
- #include <stdlib.h>
- #include "parse-events.h"
- #include <subcmd/parse-options.h>
- #include <fcntl.h>
- #include <sys/ioctl.h>
- #include <sys/mman.h>
- #include <linux/bitops.h>
- #include <linux/hash.h>
- #include <linux/log2.h>
- #include <linux/err.h>
- #include <linux/string.h>
- #include <linux/zalloc.h>
- #include <perf/evlist.h>
- #include <perf/evsel.h>
- #include <perf/cpumap.h>
- #include <perf/mmap.h>
- #include <internal/xyarray.h>
- #ifdef LACKS_SIGQUEUE_PROTOTYPE
- int sigqueue(pid_t pid, int sig, const union sigval value);
- #endif
- #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
- #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
- void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
- struct perf_thread_map *threads)
- {
- perf_evlist__init(&evlist->core);
- perf_evlist__set_maps(&evlist->core, cpus, threads);
- evlist->workload.pid = -1;
- evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
- evlist->ctl_fd.fd = -1;
- evlist->ctl_fd.ack = -1;
- evlist->ctl_fd.pos = -1;
- }
- struct evlist *evlist__new(void)
- {
- struct evlist *evlist = zalloc(sizeof(*evlist));
- if (evlist != NULL)
- evlist__init(evlist, NULL, NULL);
- return evlist;
- }
- struct evlist *perf_evlist__new_default(void)
- {
- struct evlist *evlist = evlist__new();
- if (evlist && evlist__add_default(evlist)) {
- evlist__delete(evlist);
- evlist = NULL;
- }
- return evlist;
- }
- struct evlist *perf_evlist__new_dummy(void)
- {
- struct evlist *evlist = evlist__new();
- if (evlist && evlist__add_dummy(evlist)) {
- evlist__delete(evlist);
- evlist = NULL;
- }
- return evlist;
- }
- /**
- * perf_evlist__set_id_pos - set the positions of event ids.
- * @evlist: selected event list
- *
- * Events with compatible sample types all have the same id_pos
- * and is_pos. For convenience, put a copy on evlist.
- */
- void perf_evlist__set_id_pos(struct evlist *evlist)
- {
- struct evsel *first = evlist__first(evlist);
- evlist->id_pos = first->id_pos;
- evlist->is_pos = first->is_pos;
- }
- static void perf_evlist__update_id_pos(struct evlist *evlist)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel)
- evsel__calc_id_pos(evsel);
- perf_evlist__set_id_pos(evlist);
- }
- static void evlist__purge(struct evlist *evlist)
- {
- struct evsel *pos, *n;
- evlist__for_each_entry_safe(evlist, n, pos) {
- list_del_init(&pos->core.node);
- pos->evlist = NULL;
- evsel__delete(pos);
- }
- evlist->core.nr_entries = 0;
- }
- void evlist__exit(struct evlist *evlist)
- {
- zfree(&evlist->mmap);
- zfree(&evlist->overwrite_mmap);
- perf_evlist__exit(&evlist->core);
- }
- void evlist__delete(struct evlist *evlist)
- {
- if (evlist == NULL)
- return;
- evlist__munmap(evlist);
- evlist__close(evlist);
- evlist__purge(evlist);
- evlist__exit(evlist);
- free(evlist);
- }
- void evlist__add(struct evlist *evlist, struct evsel *entry)
- {
- entry->evlist = evlist;
- entry->idx = evlist->core.nr_entries;
- entry->tracking = !entry->idx;
- perf_evlist__add(&evlist->core, &entry->core);
- if (evlist->core.nr_entries == 1)
- perf_evlist__set_id_pos(evlist);
- }
- void evlist__remove(struct evlist *evlist, struct evsel *evsel)
- {
- evsel->evlist = NULL;
- perf_evlist__remove(&evlist->core, &evsel->core);
- }
- void perf_evlist__splice_list_tail(struct evlist *evlist,
- struct list_head *list)
- {
- struct evsel *evsel, *temp;
- __evlist__for_each_entry_safe(list, temp, evsel) {
- list_del_init(&evsel->core.node);
- evlist__add(evlist, evsel);
- }
- }
- int __evlist__set_tracepoints_handlers(struct evlist *evlist,
- const struct evsel_str_handler *assocs, size_t nr_assocs)
- {
- struct evsel *evsel;
- size_t i;
- int err;
- for (i = 0; i < nr_assocs; i++) {
- // Adding a handler for an event not in this evlist, just ignore it.
- evsel = perf_evlist__find_tracepoint_by_name(evlist, assocs[i].name);
- if (evsel == NULL)
- continue;
- err = -EEXIST;
- if (evsel->handler != NULL)
- goto out;
- evsel->handler = assocs[i].handler;
- }
- err = 0;
- out:
- return err;
- }
- void __perf_evlist__set_leader(struct list_head *list)
- {
- struct evsel *evsel, *leader;
- leader = list_entry(list->next, struct evsel, core.node);
- evsel = list_entry(list->prev, struct evsel, core.node);
- leader->core.nr_members = evsel->idx - leader->idx + 1;
- __evlist__for_each_entry(list, evsel) {
- evsel->leader = leader;
- }
- }
- void perf_evlist__set_leader(struct evlist *evlist)
- {
- if (evlist->core.nr_entries) {
- evlist->nr_groups = evlist->core.nr_entries > 1 ? 1 : 0;
- __perf_evlist__set_leader(&evlist->core.entries);
- }
- }
- int __evlist__add_default(struct evlist *evlist, bool precise)
- {
- struct evsel *evsel = evsel__new_cycles(precise);
- if (evsel == NULL)
- return -ENOMEM;
- evlist__add(evlist, evsel);
- return 0;
- }
- int evlist__add_dummy(struct evlist *evlist)
- {
- struct perf_event_attr attr = {
- .type = PERF_TYPE_SOFTWARE,
- .config = PERF_COUNT_SW_DUMMY,
- .size = sizeof(attr), /* to capture ABI version */
- };
- struct evsel *evsel = evsel__new_idx(&attr, evlist->core.nr_entries);
- if (evsel == NULL)
- return -ENOMEM;
- evlist__add(evlist, evsel);
- return 0;
- }
- static int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
- {
- struct evsel *evsel, *n;
- LIST_HEAD(head);
- size_t i;
- for (i = 0; i < nr_attrs; i++) {
- evsel = evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
- if (evsel == NULL)
- goto out_delete_partial_list;
- list_add_tail(&evsel->core.node, &head);
- }
- perf_evlist__splice_list_tail(evlist, &head);
- return 0;
- out_delete_partial_list:
- __evlist__for_each_entry_safe(&head, n, evsel)
- evsel__delete(evsel);
- return -1;
- }
- int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
- {
- size_t i;
- for (i = 0; i < nr_attrs; i++)
- event_attr_init(attrs + i);
- return evlist__add_attrs(evlist, attrs, nr_attrs);
- }
- struct evsel *
- perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
- (int)evsel->core.attr.config == id)
- return evsel;
- }
- return NULL;
- }
- struct evsel *
- perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
- const char *name)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel) {
- if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
- (strcmp(evsel->name, name) == 0))
- return evsel;
- }
- return NULL;
- }
- int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
- {
- struct evsel *evsel = evsel__newtp(sys, name);
- if (IS_ERR(evsel))
- return -1;
- evsel->handler = handler;
- evlist__add(evlist, evsel);
- return 0;
- }
- static int perf_evlist__nr_threads(struct evlist *evlist,
- struct evsel *evsel)
- {
- if (evsel->core.system_wide)
- return 1;
- else
- return perf_thread_map__nr(evlist->core.threads);
- }
- void evlist__cpu_iter_start(struct evlist *evlist)
- {
- struct evsel *pos;
- /*
- * Reset the per evsel cpu_iter. This is needed because
- * each evsel's cpumap may have a different index space,
- * and some operations need the index to modify
- * the FD xyarray (e.g. open, close)
- */
- evlist__for_each_entry(evlist, pos)
- pos->cpu_iter = 0;
- }
- bool evsel__cpu_iter_skip_no_inc(struct evsel *ev, int cpu)
- {
- if (ev->cpu_iter >= ev->core.cpus->nr)
- return true;
- if (cpu >= 0 && ev->core.cpus->map[ev->cpu_iter] != cpu)
- return true;
- return false;
- }
- bool evsel__cpu_iter_skip(struct evsel *ev, int cpu)
- {
- if (!evsel__cpu_iter_skip_no_inc(ev, cpu)) {
- ev->cpu_iter++;
- return false;
- }
- return true;
- }
- void evlist__disable(struct evlist *evlist)
- {
- struct evsel *pos;
- struct affinity affinity;
- int cpu, i, imm = 0;
- bool has_imm = false;
- if (affinity__setup(&affinity) < 0)
- return;
- /* Disable 'immediate' events last */
- for (imm = 0; imm <= 1; imm++) {
- evlist__for_each_cpu(evlist, i, cpu) {
- affinity__set(&affinity, cpu);
- evlist__for_each_entry(evlist, pos) {
- if (evsel__cpu_iter_skip(pos, cpu))
- continue;
- if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
- continue;
- if (pos->immediate)
- has_imm = true;
- if (pos->immediate != imm)
- continue;
- evsel__disable_cpu(pos, pos->cpu_iter - 1);
- }
- }
- if (!has_imm)
- break;
- }
- affinity__cleanup(&affinity);
- evlist__for_each_entry(evlist, pos) {
- if (!evsel__is_group_leader(pos) || !pos->core.fd)
- continue;
- pos->disabled = true;
- }
- evlist->enabled = false;
- }
- void evlist__enable(struct evlist *evlist)
- {
- struct evsel *pos;
- struct affinity affinity;
- int cpu, i;
- if (affinity__setup(&affinity) < 0)
- return;
- evlist__for_each_cpu(evlist, i, cpu) {
- affinity__set(&affinity, cpu);
- evlist__for_each_entry(evlist, pos) {
- if (evsel__cpu_iter_skip(pos, cpu))
- continue;
- if (!evsel__is_group_leader(pos) || !pos->core.fd)
- continue;
- evsel__enable_cpu(pos, pos->cpu_iter - 1);
- }
- }
- affinity__cleanup(&affinity);
- evlist__for_each_entry(evlist, pos) {
- if (!evsel__is_group_leader(pos) || !pos->core.fd)
- continue;
- pos->disabled = false;
- }
- evlist->enabled = true;
- }
- void perf_evlist__toggle_enable(struct evlist *evlist)
- {
- (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
- }
- static int perf_evlist__enable_event_cpu(struct evlist *evlist,
- struct evsel *evsel, int cpu)
- {
- int thread;
- int nr_threads = perf_evlist__nr_threads(evlist, evsel);
- if (!evsel->core.fd)
- return -EINVAL;
- for (thread = 0; thread < nr_threads; thread++) {
- int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
- if (err)
- return err;
- }
- return 0;
- }
- static int perf_evlist__enable_event_thread(struct evlist *evlist,
- struct evsel *evsel,
- int thread)
- {
- int cpu;
- int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
- if (!evsel->core.fd)
- return -EINVAL;
- for (cpu = 0; cpu < nr_cpus; cpu++) {
- int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
- if (err)
- return err;
- }
- return 0;
- }
- int perf_evlist__enable_event_idx(struct evlist *evlist,
- struct evsel *evsel, int idx)
- {
- bool per_cpu_mmaps = !perf_cpu_map__empty(evlist->core.cpus);
- if (per_cpu_mmaps)
- return perf_evlist__enable_event_cpu(evlist, evsel, idx);
- else
- return perf_evlist__enable_event_thread(evlist, evsel, idx);
- }
- int evlist__add_pollfd(struct evlist *evlist, int fd)
- {
- return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
- }
- int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
- {
- return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
- }
- #ifdef HAVE_EVENTFD_SUPPORT
- int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd)
- {
- return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
- fdarray_flag__nonfilterable);
- }
- #endif
- int evlist__poll(struct evlist *evlist, int timeout)
- {
- return perf_evlist__poll(&evlist->core, timeout);
- }
- struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
- {
- struct hlist_head *head;
- struct perf_sample_id *sid;
- int hash;
- hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
- head = &evlist->core.heads[hash];
- hlist_for_each_entry(sid, head, node)
- if (sid->id == id)
- return sid;
- return NULL;
- }
- struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
- {
- struct perf_sample_id *sid;
- if (evlist->core.nr_entries == 1 || !id)
- return evlist__first(evlist);
- sid = perf_evlist__id2sid(evlist, id);
- if (sid)
- return container_of(sid->evsel, struct evsel, core);
- if (!evlist__sample_id_all(evlist))
- return evlist__first(evlist);
- return NULL;
- }
- struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
- u64 id)
- {
- struct perf_sample_id *sid;
- if (!id)
- return NULL;
- sid = perf_evlist__id2sid(evlist, id);
- if (sid)
- return container_of(sid->evsel, struct evsel, core);
- return NULL;
- }
- static int perf_evlist__event2id(struct evlist *evlist,
- union perf_event *event, u64 *id)
- {
- const __u64 *array = event->sample.array;
- ssize_t n;
- n = (event->header.size - sizeof(event->header)) >> 3;
- if (event->header.type == PERF_RECORD_SAMPLE) {
- if (evlist->id_pos >= n)
- return -1;
- *id = array[evlist->id_pos];
- } else {
- if (evlist->is_pos > n)
- return -1;
- n -= evlist->is_pos;
- *id = array[n];
- }
- return 0;
- }
- struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
- union perf_event *event)
- {
- struct evsel *first = evlist__first(evlist);
- struct hlist_head *head;
- struct perf_sample_id *sid;
- int hash;
- u64 id;
- if (evlist->core.nr_entries == 1)
- return first;
- if (!first->core.attr.sample_id_all &&
- event->header.type != PERF_RECORD_SAMPLE)
- return first;
- if (perf_evlist__event2id(evlist, event, &id))
- return NULL;
- /* Synthesized events have an id of zero */
- if (!id)
- return first;
- hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
- head = &evlist->core.heads[hash];
- hlist_for_each_entry(sid, head, node) {
- if (sid->id == id)
- return container_of(sid->evsel, struct evsel, core);
- }
- return NULL;
- }
- static int perf_evlist__set_paused(struct evlist *evlist, bool value)
- {
- int i;
- if (!evlist->overwrite_mmap)
- return 0;
- for (i = 0; i < evlist->core.nr_mmaps; i++) {
- int fd = evlist->overwrite_mmap[i].core.fd;
- int err;
- if (fd < 0)
- continue;
- err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
- if (err)
- return err;
- }
- return 0;
- }
- static int perf_evlist__pause(struct evlist *evlist)
- {
- return perf_evlist__set_paused(evlist, true);
- }
- static int perf_evlist__resume(struct evlist *evlist)
- {
- return perf_evlist__set_paused(evlist, false);
- }
- static void evlist__munmap_nofree(struct evlist *evlist)
- {
- int i;
- if (evlist->mmap)
- for (i = 0; i < evlist->core.nr_mmaps; i++)
- perf_mmap__munmap(&evlist->mmap[i].core);
- if (evlist->overwrite_mmap)
- for (i = 0; i < evlist->core.nr_mmaps; i++)
- perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
- }
- void evlist__munmap(struct evlist *evlist)
- {
- evlist__munmap_nofree(evlist);
- zfree(&evlist->mmap);
- zfree(&evlist->overwrite_mmap);
- }
- static void perf_mmap__unmap_cb(struct perf_mmap *map)
- {
- struct mmap *m = container_of(map, struct mmap, core);
- mmap__munmap(m);
- }
- static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
- bool overwrite)
- {
- int i;
- struct mmap *map;
- map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
- if (!map)
- return NULL;
- for (i = 0; i < evlist->core.nr_mmaps; i++) {
- struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
- /*
- * When the perf_mmap() call is made we grab one refcount, plus
- * one extra to let perf_mmap__consume() get the last
- * events after all real references (perf_mmap__get()) are
- * dropped.
- *
- * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
- * thus does perf_mmap__get() on it.
- */
- perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
- }
- return map;
- }
- static void
- perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
- struct perf_mmap_param *_mp,
- int idx, bool per_cpu)
- {
- struct evlist *evlist = container_of(_evlist, struct evlist, core);
- struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
- auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, idx, per_cpu);
- }
- static struct perf_mmap*
- perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
- {
- struct evlist *evlist = container_of(_evlist, struct evlist, core);
- struct mmap *maps;
- maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
- if (!maps) {
- maps = evlist__alloc_mmap(evlist, overwrite);
- if (!maps)
- return NULL;
- if (overwrite) {
- evlist->overwrite_mmap = maps;
- if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
- perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
- } else {
- evlist->mmap = maps;
- }
- }
- return &maps[idx].core;
- }
- static int
- perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
- int output, int cpu)
- {
- struct mmap *map = container_of(_map, struct mmap, core);
- struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
- return mmap__mmap(map, mp, output, cpu);
- }
- unsigned long perf_event_mlock_kb_in_pages(void)
- {
- unsigned long pages;
- int max;
- if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
- /*
- * Pick a once upon a time good value, i.e. things look
- * strange since we can't read a sysctl value, but lets not
- * die yet...
- */
- max = 512;
- } else {
- max -= (page_size / 1024);
- }
- pages = (max * 1024) / page_size;
- if (!is_power_of_2(pages))
- pages = rounddown_pow_of_two(pages);
- return pages;
- }
- size_t evlist__mmap_size(unsigned long pages)
- {
- if (pages == UINT_MAX)
- pages = perf_event_mlock_kb_in_pages();
- else if (!is_power_of_2(pages))
- return 0;
- return (pages + 1) * page_size;
- }
- static long parse_pages_arg(const char *str, unsigned long min,
- unsigned long max)
- {
- unsigned long pages, val;
- static struct parse_tag tags[] = {
- { .tag = 'B', .mult = 1 },
- { .tag = 'K', .mult = 1 << 10 },
- { .tag = 'M', .mult = 1 << 20 },
- { .tag = 'G', .mult = 1 << 30 },
- { .tag = 0 },
- };
- if (str == NULL)
- return -EINVAL;
- val = parse_tag_value(str, tags);
- if (val != (unsigned long) -1) {
- /* we got file size value */
- pages = PERF_ALIGN(val, page_size) / page_size;
- } else {
- /* we got pages count value */
- char *eptr;
- pages = strtoul(str, &eptr, 10);
- if (*eptr != '\0')
- return -EINVAL;
- }
- if (pages == 0 && min == 0) {
- /* leave number of pages at 0 */
- } else if (!is_power_of_2(pages)) {
- char buf[100];
- /* round pages up to next power of 2 */
- pages = roundup_pow_of_two(pages);
- if (!pages)
- return -EINVAL;
- unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
- pr_info("rounding mmap pages size to %s (%lu pages)\n",
- buf, pages);
- }
- if (pages > max)
- return -EINVAL;
- return pages;
- }
- int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
- {
- unsigned long max = UINT_MAX;
- long pages;
- if (max > SIZE_MAX / page_size)
- max = SIZE_MAX / page_size;
- pages = parse_pages_arg(str, 1, max);
- if (pages < 0) {
- pr_err("Invalid argument for --mmap_pages/-m\n");
- return -1;
- }
- *mmap_pages = pages;
- return 0;
- }
- int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
- int unset __maybe_unused)
- {
- return __perf_evlist__parse_mmap_pages(opt->value, str);
- }
- /**
- * evlist__mmap_ex - Create mmaps to receive events.
- * @evlist: list of events
- * @pages: map length in pages
- * @overwrite: overwrite older events?
- * @auxtrace_pages - auxtrace map length in pages
- * @auxtrace_overwrite - overwrite older auxtrace data?
- *
- * If @overwrite is %false the user needs to signal event consumption using
- * perf_mmap__write_tail(). Using evlist__mmap_read() does this
- * automatically.
- *
- * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
- * consumption using auxtrace_mmap__write_tail().
- *
- * Return: %0 on success, negative error code otherwise.
- */
- int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
- unsigned int auxtrace_pages,
- bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
- int comp_level)
- {
- /*
- * Delay setting mp.prot: set it before calling perf_mmap__mmap.
- * Its value is decided by evsel's write_backward.
- * So &mp should not be passed through const pointer.
- */
- struct mmap_params mp = {
- .nr_cblocks = nr_cblocks,
- .affinity = affinity,
- .flush = flush,
- .comp_level = comp_level
- };
- struct perf_evlist_mmap_ops ops = {
- .idx = perf_evlist__mmap_cb_idx,
- .get = perf_evlist__mmap_cb_get,
- .mmap = perf_evlist__mmap_cb_mmap,
- };
- evlist->core.mmap_len = evlist__mmap_size(pages);
- pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
- auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
- auxtrace_pages, auxtrace_overwrite);
- return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
- }
- int evlist__mmap(struct evlist *evlist, unsigned int pages)
- {
- return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
- }
- int perf_evlist__create_maps(struct evlist *evlist, struct target *target)
- {
- bool all_threads = (target->per_thread && target->system_wide);
- struct perf_cpu_map *cpus;
- struct perf_thread_map *threads;
- /*
- * If specify '-a' and '--per-thread' to perf record, perf record
- * will override '--per-thread'. target->per_thread = false and
- * target->system_wide = true.
- *
- * If specify '--per-thread' only to perf record,
- * target->per_thread = true and target->system_wide = false.
- *
- * So target->per_thread && target->system_wide is false.
- * For perf record, thread_map__new_str doesn't call
- * thread_map__new_all_cpus. That will keep perf record's
- * current behavior.
- *
- * For perf stat, it allows the case that target->per_thread and
- * target->system_wide are all true. It means to collect system-wide
- * per-thread data. thread_map__new_str will call
- * thread_map__new_all_cpus to enumerate all threads.
- */
- threads = thread_map__new_str(target->pid, target->tid, target->uid,
- all_threads);
- if (!threads)
- return -1;
- if (target__uses_dummy_map(target))
- cpus = perf_cpu_map__dummy_new();
- else
- cpus = perf_cpu_map__new(target->cpu_list);
- if (!cpus)
- goto out_delete_threads;
- evlist->core.has_user_cpus = !!target->cpu_list;
- perf_evlist__set_maps(&evlist->core, cpus, threads);
- /* as evlist now has references, put count here */
- perf_cpu_map__put(cpus);
- perf_thread_map__put(threads);
- return 0;
- out_delete_threads:
- perf_thread_map__put(threads);
- return -1;
- }
- void __perf_evlist__set_sample_bit(struct evlist *evlist,
- enum perf_event_sample_format bit)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel)
- __evsel__set_sample_bit(evsel, bit);
- }
- void __perf_evlist__reset_sample_bit(struct evlist *evlist,
- enum perf_event_sample_format bit)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel)
- __evsel__reset_sample_bit(evsel, bit);
- }
- int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
- {
- struct evsel *evsel;
- int err = 0;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->filter == NULL)
- continue;
- /*
- * filters only work for tracepoint event, which doesn't have cpu limit.
- * So evlist and evsel should always be same.
- */
- err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
- if (err) {
- *err_evsel = evsel;
- break;
- }
- }
- return err;
- }
- int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter)
- {
- struct evsel *evsel;
- int err = 0;
- if (filter == NULL)
- return -1;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
- continue;
- err = evsel__set_filter(evsel, filter);
- if (err)
- break;
- }
- return err;
- }
- int perf_evlist__append_tp_filter(struct evlist *evlist, const char *filter)
- {
- struct evsel *evsel;
- int err = 0;
- if (filter == NULL)
- return -1;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
- continue;
- err = evsel__append_tp_filter(evsel, filter);
- if (err)
- break;
- }
- return err;
- }
- char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
- {
- char *filter;
- size_t i;
- for (i = 0; i < npids; ++i) {
- if (i == 0) {
- if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
- return NULL;
- } else {
- char *tmp;
- if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
- goto out_free;
- free(filter);
- filter = tmp;
- }
- }
- return filter;
- out_free:
- free(filter);
- return NULL;
- }
- int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
- {
- char *filter = asprintf__tp_filter_pids(npids, pids);
- int ret = perf_evlist__set_tp_filter(evlist, filter);
- free(filter);
- return ret;
- }
- int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
- {
- return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
- }
- int perf_evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
- {
- char *filter = asprintf__tp_filter_pids(npids, pids);
- int ret = perf_evlist__append_tp_filter(evlist, filter);
- free(filter);
- return ret;
- }
- int perf_evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
- {
- return perf_evlist__append_tp_filter_pids(evlist, 1, &pid);
- }
- bool evlist__valid_sample_type(struct evlist *evlist)
- {
- struct evsel *pos;
- if (evlist->core.nr_entries == 1)
- return true;
- if (evlist->id_pos < 0 || evlist->is_pos < 0)
- return false;
- evlist__for_each_entry(evlist, pos) {
- if (pos->id_pos != evlist->id_pos ||
- pos->is_pos != evlist->is_pos)
- return false;
- }
- return true;
- }
- u64 __evlist__combined_sample_type(struct evlist *evlist)
- {
- struct evsel *evsel;
- if (evlist->combined_sample_type)
- return evlist->combined_sample_type;
- evlist__for_each_entry(evlist, evsel)
- evlist->combined_sample_type |= evsel->core.attr.sample_type;
- return evlist->combined_sample_type;
- }
- u64 evlist__combined_sample_type(struct evlist *evlist)
- {
- evlist->combined_sample_type = 0;
- return __evlist__combined_sample_type(evlist);
- }
- u64 evlist__combined_branch_type(struct evlist *evlist)
- {
- struct evsel *evsel;
- u64 branch_type = 0;
- evlist__for_each_entry(evlist, evsel)
- branch_type |= evsel->core.attr.branch_sample_type;
- return branch_type;
- }
- bool perf_evlist__valid_read_format(struct evlist *evlist)
- {
- struct evsel *first = evlist__first(evlist), *pos = first;
- u64 read_format = first->core.attr.read_format;
- u64 sample_type = first->core.attr.sample_type;
- evlist__for_each_entry(evlist, pos) {
- if (read_format != pos->core.attr.read_format) {
- pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n",
- read_format, (u64)pos->core.attr.read_format);
- }
- }
- /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
- if ((sample_type & PERF_SAMPLE_READ) &&
- !(read_format & PERF_FORMAT_ID)) {
- return false;
- }
- return true;
- }
- u16 perf_evlist__id_hdr_size(struct evlist *evlist)
- {
- struct evsel *first = evlist__first(evlist);
- struct perf_sample *data;
- u64 sample_type;
- u16 size = 0;
- if (!first->core.attr.sample_id_all)
- goto out;
- sample_type = first->core.attr.sample_type;
- if (sample_type & PERF_SAMPLE_TID)
- size += sizeof(data->tid) * 2;
- if (sample_type & PERF_SAMPLE_TIME)
- size += sizeof(data->time);
- if (sample_type & PERF_SAMPLE_ID)
- size += sizeof(data->id);
- if (sample_type & PERF_SAMPLE_STREAM_ID)
- size += sizeof(data->stream_id);
- if (sample_type & PERF_SAMPLE_CPU)
- size += sizeof(data->cpu) * 2;
- if (sample_type & PERF_SAMPLE_IDENTIFIER)
- size += sizeof(data->id);
- out:
- return size;
- }
- bool evlist__valid_sample_id_all(struct evlist *evlist)
- {
- struct evsel *first = evlist__first(evlist), *pos = first;
- evlist__for_each_entry_continue(evlist, pos) {
- if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
- return false;
- }
- return true;
- }
- bool evlist__sample_id_all(struct evlist *evlist)
- {
- struct evsel *first = evlist__first(evlist);
- return first->core.attr.sample_id_all;
- }
- void perf_evlist__set_selected(struct evlist *evlist,
- struct evsel *evsel)
- {
- evlist->selected = evsel;
- }
- void evlist__close(struct evlist *evlist)
- {
- struct evsel *evsel;
- struct affinity affinity;
- int cpu, i;
- /*
- * With perf record core.cpus is usually NULL.
- * Use the old method to handle this for now.
- */
- if (!evlist->core.cpus) {
- evlist__for_each_entry_reverse(evlist, evsel)
- evsel__close(evsel);
- return;
- }
- if (affinity__setup(&affinity) < 0)
- return;
- evlist__for_each_cpu(evlist, i, cpu) {
- affinity__set(&affinity, cpu);
- evlist__for_each_entry_reverse(evlist, evsel) {
- if (evsel__cpu_iter_skip(evsel, cpu))
- continue;
- perf_evsel__close_cpu(&evsel->core, evsel->cpu_iter - 1);
- }
- }
- affinity__cleanup(&affinity);
- evlist__for_each_entry_reverse(evlist, evsel) {
- perf_evsel__free_fd(&evsel->core);
- perf_evsel__free_id(&evsel->core);
- }
- }
- static int perf_evlist__create_syswide_maps(struct evlist *evlist)
- {
- struct perf_cpu_map *cpus;
- struct perf_thread_map *threads;
- int err = -ENOMEM;
- /*
- * Try reading /sys/devices/system/cpu/online to get
- * an all cpus map.
- *
- * FIXME: -ENOMEM is the best we can do here, the cpu_map
- * code needs an overhaul to properly forward the
- * error, and we may not want to do that fallback to a
- * default cpu identity map :-\
- */
- cpus = perf_cpu_map__new(NULL);
- if (!cpus)
- goto out;
- threads = perf_thread_map__new_dummy();
- if (!threads)
- goto out_put;
- perf_evlist__set_maps(&evlist->core, cpus, threads);
- perf_thread_map__put(threads);
- out_put:
- perf_cpu_map__put(cpus);
- out:
- return err;
- }
- int evlist__open(struct evlist *evlist)
- {
- struct evsel *evsel;
- int err;
- /*
- * Default: one fd per CPU, all threads, aka systemwide
- * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
- */
- if (evlist->core.threads == NULL && evlist->core.cpus == NULL) {
- err = perf_evlist__create_syswide_maps(evlist);
- if (err < 0)
- goto out_err;
- }
- perf_evlist__update_id_pos(evlist);
- evlist__for_each_entry(evlist, evsel) {
- err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
- if (err < 0)
- goto out_err;
- }
- return 0;
- out_err:
- evlist__close(evlist);
- errno = -err;
- return err;
- }
- int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
- const char *argv[], bool pipe_output,
- void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
- {
- int child_ready_pipe[2], go_pipe[2];
- char bf;
- if (pipe(child_ready_pipe) < 0) {
- perror("failed to create 'ready' pipe");
- return -1;
- }
- if (pipe(go_pipe) < 0) {
- perror("failed to create 'go' pipe");
- goto out_close_ready_pipe;
- }
- evlist->workload.pid = fork();
- if (evlist->workload.pid < 0) {
- perror("failed to fork");
- goto out_close_pipes;
- }
- if (!evlist->workload.pid) {
- int ret;
- if (pipe_output)
- dup2(2, 1);
- signal(SIGTERM, SIG_DFL);
- close(child_ready_pipe[0]);
- close(go_pipe[1]);
- fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
- /*
- * Tell the parent we're ready to go
- */
- close(child_ready_pipe[1]);
- /*
- * Wait until the parent tells us to go.
- */
- ret = read(go_pipe[0], &bf, 1);
- /*
- * The parent will ask for the execvp() to be performed by
- * writing exactly one byte, in workload.cork_fd, usually via
- * perf_evlist__start_workload().
- *
- * For cancelling the workload without actually running it,
- * the parent will just close workload.cork_fd, without writing
- * anything, i.e. read will return zero and we just exit()
- * here.
- */
- if (ret != 1) {
- if (ret == -1)
- perror("unable to read pipe");
- exit(ret);
- }
- execvp(argv[0], (char **)argv);
- if (exec_error) {
- union sigval val;
- val.sival_int = errno;
- if (sigqueue(getppid(), SIGUSR1, val))
- perror(argv[0]);
- } else
- perror(argv[0]);
- exit(-1);
- }
- if (exec_error) {
- struct sigaction act = {
- .sa_flags = SA_SIGINFO,
- .sa_sigaction = exec_error,
- };
- sigaction(SIGUSR1, &act, NULL);
- }
- if (target__none(target)) {
- if (evlist->core.threads == NULL) {
- fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
- __func__, __LINE__);
- goto out_close_pipes;
- }
- perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
- }
- close(child_ready_pipe[1]);
- close(go_pipe[0]);
- /*
- * wait for child to settle
- */
- if (read(child_ready_pipe[0], &bf, 1) == -1) {
- perror("unable to read pipe");
- goto out_close_pipes;
- }
- fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
- evlist->workload.cork_fd = go_pipe[1];
- close(child_ready_pipe[0]);
- return 0;
- out_close_pipes:
- close(go_pipe[0]);
- close(go_pipe[1]);
- out_close_ready_pipe:
- close(child_ready_pipe[0]);
- close(child_ready_pipe[1]);
- return -1;
- }
- int perf_evlist__start_workload(struct evlist *evlist)
- {
- if (evlist->workload.cork_fd > 0) {
- char bf = 0;
- int ret;
- /*
- * Remove the cork, let it rip!
- */
- ret = write(evlist->workload.cork_fd, &bf, 1);
- if (ret < 0)
- perror("unable to write to pipe");
- close(evlist->workload.cork_fd);
- return ret;
- }
- return 0;
- }
- int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
- struct perf_sample *sample)
- {
- struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
- if (!evsel)
- return -EFAULT;
- return evsel__parse_sample(evsel, event, sample);
- }
- int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
- union perf_event *event,
- u64 *timestamp)
- {
- struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
- if (!evsel)
- return -EFAULT;
- return evsel__parse_sample_timestamp(evsel, event, timestamp);
- }
- int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
- {
- int printed, value;
- char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
- switch (err) {
- case EACCES:
- case EPERM:
- printed = scnprintf(buf, size,
- "Error:\t%s.\n"
- "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
- value = perf_event_paranoid();
- printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
- if (value >= 2) {
- printed += scnprintf(buf + printed, size - printed,
- "For your workloads it needs to be <= 1\nHint:\t");
- }
- printed += scnprintf(buf + printed, size - printed,
- "For system wide tracing it needs to be set to -1.\n");
- printed += scnprintf(buf + printed, size - printed,
- "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
- "Hint:\tThe current value is %d.", value);
- break;
- case EINVAL: {
- struct evsel *first = evlist__first(evlist);
- int max_freq;
- if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
- goto out_default;
- if (first->core.attr.sample_freq < (u64)max_freq)
- goto out_default;
- printed = scnprintf(buf, size,
- "Error:\t%s.\n"
- "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
- "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
- emsg, max_freq, first->core.attr.sample_freq);
- break;
- }
- default:
- out_default:
- scnprintf(buf, size, "%s", emsg);
- break;
- }
- return 0;
- }
- int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
- {
- char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
- int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
- switch (err) {
- case EPERM:
- sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
- printed += scnprintf(buf + printed, size - printed,
- "Error:\t%s.\n"
- "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
- "Hint:\tTried using %zd kB.\n",
- emsg, pages_max_per_user, pages_attempted);
- if (pages_attempted >= pages_max_per_user) {
- printed += scnprintf(buf + printed, size - printed,
- "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
- pages_max_per_user + pages_attempted);
- }
- printed += scnprintf(buf + printed, size - printed,
- "Hint:\tTry using a smaller -m/--mmap-pages value.");
- break;
- default:
- scnprintf(buf, size, "%s", emsg);
- break;
- }
- return 0;
- }
- void perf_evlist__to_front(struct evlist *evlist,
- struct evsel *move_evsel)
- {
- struct evsel *evsel, *n;
- LIST_HEAD(move);
- if (move_evsel == evlist__first(evlist))
- return;
- evlist__for_each_entry_safe(evlist, n, evsel) {
- if (evsel->leader == move_evsel->leader)
- list_move_tail(&evsel->core.node, &move);
- }
- list_splice(&move, &evlist->core.entries);
- }
- struct evsel *perf_evlist__get_tracking_event(struct evlist *evlist)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->tracking)
- return evsel;
- }
- return evlist__first(evlist);
- }
- void perf_evlist__set_tracking_event(struct evlist *evlist,
- struct evsel *tracking_evsel)
- {
- struct evsel *evsel;
- if (tracking_evsel->tracking)
- return;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel != tracking_evsel)
- evsel->tracking = false;
- }
- tracking_evsel->tracking = true;
- }
- struct evsel *
- perf_evlist__find_evsel_by_str(struct evlist *evlist,
- const char *str)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel) {
- if (!evsel->name)
- continue;
- if (strcmp(str, evsel->name) == 0)
- return evsel;
- }
- return NULL;
- }
- void perf_evlist__toggle_bkw_mmap(struct evlist *evlist,
- enum bkw_mmap_state state)
- {
- enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
- enum action {
- NONE,
- PAUSE,
- RESUME,
- } action = NONE;
- if (!evlist->overwrite_mmap)
- return;
- switch (old_state) {
- case BKW_MMAP_NOTREADY: {
- if (state != BKW_MMAP_RUNNING)
- goto state_err;
- break;
- }
- case BKW_MMAP_RUNNING: {
- if (state != BKW_MMAP_DATA_PENDING)
- goto state_err;
- action = PAUSE;
- break;
- }
- case BKW_MMAP_DATA_PENDING: {
- if (state != BKW_MMAP_EMPTY)
- goto state_err;
- break;
- }
- case BKW_MMAP_EMPTY: {
- if (state != BKW_MMAP_RUNNING)
- goto state_err;
- action = RESUME;
- break;
- }
- default:
- WARN_ONCE(1, "Shouldn't get there\n");
- }
- evlist->bkw_mmap_state = state;
- switch (action) {
- case PAUSE:
- perf_evlist__pause(evlist);
- break;
- case RESUME:
- perf_evlist__resume(evlist);
- break;
- case NONE:
- default:
- break;
- }
- state_err:
- return;
- }
- bool perf_evlist__exclude_kernel(struct evlist *evlist)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel) {
- if (!evsel->core.attr.exclude_kernel)
- return false;
- }
- return true;
- }
- /*
- * Events in data file are not collect in groups, but we still want
- * the group display. Set the artificial group and set the leader's
- * forced_leader flag to notify the display code.
- */
- void perf_evlist__force_leader(struct evlist *evlist)
- {
- if (!evlist->nr_groups) {
- struct evsel *leader = evlist__first(evlist);
- perf_evlist__set_leader(evlist);
- leader->forced_leader = true;
- }
- }
- struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
- struct evsel *evsel,
- bool close)
- {
- struct evsel *c2, *leader;
- bool is_open = true;
- leader = evsel->leader;
- pr_debug("Weak group for %s/%d failed\n",
- leader->name, leader->core.nr_members);
- /*
- * for_each_group_member doesn't work here because it doesn't
- * include the first entry.
- */
- evlist__for_each_entry(evsel_list, c2) {
- if (c2 == evsel)
- is_open = false;
- if (c2->leader == leader) {
- if (is_open && close)
- perf_evsel__close(&c2->core);
- c2->leader = c2;
- c2->core.nr_members = 0;
- /*
- * Set this for all former members of the group
- * to indicate they get reopened.
- */
- c2->reset_group = true;
- }
- }
- return leader;
- }
- static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
- {
- char *s, *p;
- int ret = 0, fd;
- if (strncmp(str, "fifo:", 5))
- return -EINVAL;
- str += 5;
- if (!*str || *str == ',')
- return -EINVAL;
- s = strdup(str);
- if (!s)
- return -ENOMEM;
- p = strchr(s, ',');
- if (p)
- *p = '\0';
- /*
- * O_RDWR avoids POLLHUPs which is necessary to allow the other
- * end of a FIFO to be repeatedly opened and closed.
- */
- fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
- if (fd < 0) {
- pr_err("Failed to open '%s'\n", s);
- ret = -errno;
- goto out_free;
- }
- *ctl_fd = fd;
- *ctl_fd_close = true;
- if (p && *++p) {
- /* O_RDWR | O_NONBLOCK means the other end need not be open */
- fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
- if (fd < 0) {
- pr_err("Failed to open '%s'\n", p);
- ret = -errno;
- goto out_free;
- }
- *ctl_fd_ack = fd;
- }
- out_free:
- free(s);
- return ret;
- }
- int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
- {
- char *comma = NULL, *endptr = NULL;
- *ctl_fd_close = false;
- if (strncmp(str, "fd:", 3))
- return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close);
- *ctl_fd = strtoul(&str[3], &endptr, 0);
- if (endptr == &str[3])
- return -EINVAL;
- comma = strchr(str, ',');
- if (comma) {
- if (endptr != comma)
- return -EINVAL;
- *ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
- if (endptr == comma + 1 || *endptr != '\0')
- return -EINVAL;
- }
- return 0;
- }
- void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close)
- {
- if (*ctl_fd_close) {
- *ctl_fd_close = false;
- close(ctl_fd);
- if (ctl_fd_ack >= 0)
- close(ctl_fd_ack);
- }
- }
- int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
- {
- if (fd == -1) {
- pr_debug("Control descriptor is not initialized\n");
- return 0;
- }
- evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
- fdarray_flag__nonfilterable);
- if (evlist->ctl_fd.pos < 0) {
- evlist->ctl_fd.pos = -1;
- pr_err("Failed to add ctl fd entry: %m\n");
- return -1;
- }
- evlist->ctl_fd.fd = fd;
- evlist->ctl_fd.ack = ack;
- return 0;
- }
- bool evlist__ctlfd_initialized(struct evlist *evlist)
- {
- return evlist->ctl_fd.pos >= 0;
- }
- int evlist__finalize_ctlfd(struct evlist *evlist)
- {
- struct pollfd *entries = evlist->core.pollfd.entries;
- if (!evlist__ctlfd_initialized(evlist))
- return 0;
- entries[evlist->ctl_fd.pos].fd = -1;
- entries[evlist->ctl_fd.pos].events = 0;
- entries[evlist->ctl_fd.pos].revents = 0;
- evlist->ctl_fd.pos = -1;
- evlist->ctl_fd.ack = -1;
- evlist->ctl_fd.fd = -1;
- return 0;
- }
- static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
- char *cmd_data, size_t data_size)
- {
- int err;
- char c;
- size_t bytes_read = 0;
- *cmd = EVLIST_CTL_CMD_UNSUPPORTED;
- memset(cmd_data, 0, data_size);
- data_size--;
- do {
- err = read(evlist->ctl_fd.fd, &c, 1);
- if (err > 0) {
- if (c == '\n' || c == '\0')
- break;
- cmd_data[bytes_read++] = c;
- if (bytes_read == data_size)
- break;
- continue;
- } else if (err == -1) {
- if (errno == EINTR)
- continue;
- if (errno == EAGAIN || errno == EWOULDBLOCK)
- err = 0;
- else
- pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
- }
- break;
- } while (1);
- pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
- bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
- if (bytes_read > 0) {
- if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
- (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
- *cmd = EVLIST_CTL_CMD_ENABLE;
- } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
- (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
- *cmd = EVLIST_CTL_CMD_DISABLE;
- } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG,
- (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
- *cmd = EVLIST_CTL_CMD_SNAPSHOT;
- pr_debug("is snapshot\n");
- }
- }
- return bytes_read ? (int)bytes_read : err;
- }
- int evlist__ctlfd_ack(struct evlist *evlist)
- {
- int err;
- if (evlist->ctl_fd.ack == -1)
- return 0;
- err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
- sizeof(EVLIST_CTL_CMD_ACK_TAG));
- if (err == -1)
- pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
- return err;
- }
- int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
- {
- int err = 0;
- char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
- int ctlfd_pos = evlist->ctl_fd.pos;
- struct pollfd *entries = evlist->core.pollfd.entries;
- if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
- return 0;
- if (entries[ctlfd_pos].revents & POLLIN) {
- err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
- EVLIST_CTL_CMD_MAX_LEN);
- if (err > 0) {
- switch (*cmd) {
- case EVLIST_CTL_CMD_ENABLE:
- evlist__enable(evlist);
- break;
- case EVLIST_CTL_CMD_DISABLE:
- evlist__disable(evlist);
- break;
- case EVLIST_CTL_CMD_SNAPSHOT:
- break;
- case EVLIST_CTL_CMD_ACK:
- case EVLIST_CTL_CMD_UNSUPPORTED:
- default:
- pr_debug("ctlfd: unsupported %d\n", *cmd);
- break;
- }
- if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED ||
- *cmd == EVLIST_CTL_CMD_SNAPSHOT))
- evlist__ctlfd_ack(evlist);
- }
- }
- if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
- evlist__finalize_ctlfd(evlist);
- else
- entries[ctlfd_pos].revents = 0;
- return err;
- }
- struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
- {
- struct evsel *evsel;
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->idx == idx)
- return evsel;
- }
- return NULL;
- }
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