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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/util/evlist.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/evlist.c')
-rw-r--r-- | tools/perf/util/evlist.c | 2502 |
1 files changed, 2502 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c new file mode 100644 index 0000000000..c779b9f2e6 --- /dev/null +++ b/tools/perf/util/evlist.c @@ -0,0 +1,2502 @@ +// 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 "record.h" +#include "debug.h" +#include "units.h" +#include "bpf_counter.h" +#include <internal/lib.h> // page_size +#include "affinity.h" +#include "../perf.h" +#include "asm/bug.h" +#include "bpf-event.h" +#include "util/event.h" +#include "util/string2.h" +#include "util/perf_api_probe.h" +#include "util/evsel_fprintf.h" +#include "util/pmu.h" +#include "util/sample.h" +#include "util/bpf-filter.h" +#include "util/stat.h" +#include "util/util.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 <sys/prctl.h> +#include <sys/timerfd.h> + +#include <linux/bitops.h> +#include <linux/hash.h> +#include <linux/log2.h> +#include <linux/err.h> +#include <linux/string.h> +#include <linux/time64.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 *evlist__new_default(void) +{ + struct evlist *evlist = evlist__new(); + bool can_profile_kernel; + int err; + + if (!evlist) + return NULL; + + can_profile_kernel = perf_event_paranoid_check(1); + err = parse_event(evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu"); + if (err) { + evlist__delete(evlist); + evlist = NULL; + } + + return evlist; +} + +struct evlist *evlist__new_dummy(void) +{ + struct evlist *evlist = evlist__new(); + + if (evlist && evlist__add_dummy(evlist)) { + evlist__delete(evlist); + evlist = NULL; + } + + return evlist; +} + +/** + * 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 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 evlist__update_id_pos(struct evlist *evlist) +{ + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) + evsel__calc_id_pos(evsel); + + 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) +{ + event_enable_timer__exit(&evlist->eet); + zfree(&evlist->mmap); + zfree(&evlist->overwrite_mmap); + perf_evlist__exit(&evlist->core); +} + +void evlist__delete(struct evlist *evlist) +{ + if (evlist == NULL) + return; + + evlist__free_stats(evlist); + evlist__munmap(evlist); + evlist__close(evlist); + evlist__purge(evlist); + evlist__exit(evlist); + free(evlist); +} + +void evlist__add(struct evlist *evlist, struct evsel *entry) +{ + perf_evlist__add(&evlist->core, &entry->core); + entry->evlist = evlist; + entry->tracking = !entry->core.idx; + + if (evlist->core.nr_entries == 1) + 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 evlist__splice_list_tail(struct evlist *evlist, struct list_head *list) +{ + while (!list_empty(list)) { + struct evsel *evsel, *temp, *leader = NULL; + + __evlist__for_each_entry_safe(list, temp, evsel) { + list_del_init(&evsel->core.node); + evlist__add(evlist, evsel); + leader = evsel; + break; + } + + __evlist__for_each_entry_safe(list, temp, evsel) { + if (evsel__has_leader(evsel, leader)) { + 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) +{ + 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. + struct evsel *evsel = 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; +} + +static void evlist__set_leader(struct evlist *evlist) +{ + perf_evlist__set_leader(&evlist->core); +} + +static struct evsel *evlist__dummy_event(struct evlist *evlist) +{ + struct perf_event_attr attr = { + .type = PERF_TYPE_SOFTWARE, + .config = PERF_COUNT_SW_DUMMY, + .size = sizeof(attr), /* to capture ABI version */ + /* Avoid frequency mode for dummy events to avoid associated timers. */ + .freq = 0, + .sample_period = 1, + }; + + return evsel__new_idx(&attr, evlist->core.nr_entries); +} + +int evlist__add_dummy(struct evlist *evlist) +{ + struct evsel *evsel = evlist__dummy_event(evlist); + + if (evsel == NULL) + return -ENOMEM; + + evlist__add(evlist, evsel); + return 0; +} + +struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide) +{ + struct evsel *evsel = evlist__dummy_event(evlist); + + if (!evsel) + return NULL; + + evsel->core.attr.exclude_kernel = 1; + evsel->core.attr.exclude_guest = 1; + evsel->core.attr.exclude_hv = 1; + evsel->core.system_wide = system_wide; + evsel->no_aux_samples = true; + evsel->name = strdup("dummy:u"); + + evlist__add(evlist, evsel); + return evsel; +} + +#ifdef HAVE_LIBTRACEEVENT +struct evsel *evlist__add_sched_switch(struct evlist *evlist, bool system_wide) +{ + struct evsel *evsel = evsel__newtp_idx("sched", "sched_switch", 0); + + if (IS_ERR(evsel)) + return evsel; + + evsel__set_sample_bit(evsel, CPU); + evsel__set_sample_bit(evsel, TIME); + + evsel->core.system_wide = system_wide; + evsel->no_aux_samples = true; + + evlist__add(evlist, evsel); + return evsel; +} +#endif + +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); + } + + 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); +} + +__weak int arch_evlist__add_default_attrs(struct evlist *evlist, + struct perf_event_attr *attrs, + size_t nr_attrs) +{ + if (!nr_attrs) + return 0; + + return __evlist__add_default_attrs(evlist, attrs, nr_attrs); +} + +struct evsel *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 *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; +} + +#ifdef HAVE_LIBTRACEEVENT +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; +} +#endif + +struct evlist_cpu_iterator evlist__cpu_begin(struct evlist *evlist, struct affinity *affinity) +{ + struct evlist_cpu_iterator itr = { + .container = evlist, + .evsel = NULL, + .cpu_map_idx = 0, + .evlist_cpu_map_idx = 0, + .evlist_cpu_map_nr = perf_cpu_map__nr(evlist->core.all_cpus), + .cpu = (struct perf_cpu){ .cpu = -1}, + .affinity = affinity, + }; + + if (evlist__empty(evlist)) { + /* Ensure the empty list doesn't iterate. */ + itr.evlist_cpu_map_idx = itr.evlist_cpu_map_nr; + } else { + itr.evsel = evlist__first(evlist); + if (itr.affinity) { + itr.cpu = perf_cpu_map__cpu(evlist->core.all_cpus, 0); + affinity__set(itr.affinity, itr.cpu.cpu); + itr.cpu_map_idx = perf_cpu_map__idx(itr.evsel->core.cpus, itr.cpu); + /* + * If this CPU isn't in the evsel's cpu map then advance + * through the list. + */ + if (itr.cpu_map_idx == -1) + evlist_cpu_iterator__next(&itr); + } + } + return itr; +} + +void evlist_cpu_iterator__next(struct evlist_cpu_iterator *evlist_cpu_itr) +{ + while (evlist_cpu_itr->evsel != evlist__last(evlist_cpu_itr->container)) { + evlist_cpu_itr->evsel = evsel__next(evlist_cpu_itr->evsel); + evlist_cpu_itr->cpu_map_idx = + perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus, + evlist_cpu_itr->cpu); + if (evlist_cpu_itr->cpu_map_idx != -1) + return; + } + evlist_cpu_itr->evlist_cpu_map_idx++; + if (evlist_cpu_itr->evlist_cpu_map_idx < evlist_cpu_itr->evlist_cpu_map_nr) { + evlist_cpu_itr->evsel = evlist__first(evlist_cpu_itr->container); + evlist_cpu_itr->cpu = + perf_cpu_map__cpu(evlist_cpu_itr->container->core.all_cpus, + evlist_cpu_itr->evlist_cpu_map_idx); + if (evlist_cpu_itr->affinity) + affinity__set(evlist_cpu_itr->affinity, evlist_cpu_itr->cpu.cpu); + evlist_cpu_itr->cpu_map_idx = + perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus, + evlist_cpu_itr->cpu); + /* + * If this CPU isn't in the evsel's cpu map then advance through + * the list. + */ + if (evlist_cpu_itr->cpu_map_idx == -1) + evlist_cpu_iterator__next(evlist_cpu_itr); + } +} + +bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr) +{ + return evlist_cpu_itr->evlist_cpu_map_idx >= evlist_cpu_itr->evlist_cpu_map_nr; +} + +static int evsel__strcmp(struct evsel *pos, char *evsel_name) +{ + if (!evsel_name) + return 0; + if (evsel__is_dummy_event(pos)) + return 1; + return !evsel__name_is(pos, evsel_name); +} + +static int evlist__is_enabled(struct evlist *evlist) +{ + struct evsel *pos; + + evlist__for_each_entry(evlist, pos) { + if (!evsel__is_group_leader(pos) || !pos->core.fd) + continue; + /* If at least one event is enabled, evlist is enabled. */ + if (!pos->disabled) + return true; + } + return false; +} + +static void __evlist__disable(struct evlist *evlist, char *evsel_name, bool excl_dummy) +{ + struct evsel *pos; + struct evlist_cpu_iterator evlist_cpu_itr; + struct affinity saved_affinity, *affinity = NULL; + bool has_imm = false; + + // See explanation in evlist__close() + if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) { + if (affinity__setup(&saved_affinity) < 0) + return; + affinity = &saved_affinity; + } + + /* Disable 'immediate' events last */ + for (int imm = 0; imm <= 1; imm++) { + evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) { + pos = evlist_cpu_itr.evsel; + if (evsel__strcmp(pos, evsel_name)) + continue; + if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd) + continue; + if (excl_dummy && evsel__is_dummy_event(pos)) + continue; + if (pos->immediate) + has_imm = true; + if (pos->immediate != imm) + continue; + evsel__disable_cpu(pos, evlist_cpu_itr.cpu_map_idx); + } + if (!has_imm) + break; + } + + affinity__cleanup(affinity); + evlist__for_each_entry(evlist, pos) { + if (evsel__strcmp(pos, evsel_name)) + continue; + if (!evsel__is_group_leader(pos) || !pos->core.fd) + continue; + if (excl_dummy && evsel__is_dummy_event(pos)) + continue; + pos->disabled = true; + } + + /* + * If we disabled only single event, we need to check + * the enabled state of the evlist manually. + */ + if (evsel_name) + evlist->enabled = evlist__is_enabled(evlist); + else + evlist->enabled = false; +} + +void evlist__disable(struct evlist *evlist) +{ + __evlist__disable(evlist, NULL, false); +} + +void evlist__disable_non_dummy(struct evlist *evlist) +{ + __evlist__disable(evlist, NULL, true); +} + +void evlist__disable_evsel(struct evlist *evlist, char *evsel_name) +{ + __evlist__disable(evlist, evsel_name, false); +} + +static void __evlist__enable(struct evlist *evlist, char *evsel_name, bool excl_dummy) +{ + struct evsel *pos; + struct evlist_cpu_iterator evlist_cpu_itr; + struct affinity saved_affinity, *affinity = NULL; + + // See explanation in evlist__close() + if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) { + if (affinity__setup(&saved_affinity) < 0) + return; + affinity = &saved_affinity; + } + + evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) { + pos = evlist_cpu_itr.evsel; + if (evsel__strcmp(pos, evsel_name)) + continue; + if (!evsel__is_group_leader(pos) || !pos->core.fd) + continue; + if (excl_dummy && evsel__is_dummy_event(pos)) + continue; + evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx); + } + affinity__cleanup(affinity); + evlist__for_each_entry(evlist, pos) { + if (evsel__strcmp(pos, evsel_name)) + continue; + if (!evsel__is_group_leader(pos) || !pos->core.fd) + continue; + if (excl_dummy && evsel__is_dummy_event(pos)) + continue; + pos->disabled = false; + } + + /* + * Even single event sets the 'enabled' for evlist, + * so the toggle can work properly and toggle to + * 'disabled' state. + */ + evlist->enabled = true; +} + +void evlist__enable(struct evlist *evlist) +{ + __evlist__enable(evlist, NULL, false); +} + +void evlist__enable_non_dummy(struct evlist *evlist) +{ + __evlist__enable(evlist, NULL, true); +} + +void evlist__enable_evsel(struct evlist *evlist, char *evsel_name) +{ + __evlist__enable(evlist, evsel_name, false); +} + +void evlist__toggle_enable(struct evlist *evlist) +{ + (evlist->enabled ? evlist__disable : evlist__enable)(evlist); +} + +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 | + fdarray_flag__non_perf_event); +} +#endif + +int evlist__poll(struct evlist *evlist, int timeout) +{ + return perf_evlist__poll(&evlist->core, timeout); +} + +struct perf_sample_id *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 *evlist__id2evsel(struct evlist *evlist, u64 id) +{ + struct perf_sample_id *sid; + + if (evlist->core.nr_entries == 1 || !id) + return evlist__first(evlist); + + sid = 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 *evlist__id2evsel_strict(struct evlist *evlist, u64 id) +{ + struct perf_sample_id *sid; + + if (!id) + return NULL; + + sid = evlist__id2sid(evlist, id); + if (sid) + return container_of(sid->evsel, struct evsel, core); + + return NULL; +} + +static int 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 *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 (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 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 evlist__pause(struct evlist *evlist) +{ + return evlist__set_paused(evlist, true); +} + +static int evlist__resume(struct evlist *evlist) +{ + return 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_evsel *_evsel, + struct perf_mmap_param *_mp, + int idx) +{ + struct evlist *evlist = container_of(_evlist, struct evlist, core); + struct mmap_params *mp = container_of(_mp, struct mmap_params, core); + struct evsel *evsel = container_of(_evsel, struct evsel, core); + + auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, evsel, idx); +} + +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) + 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, struct perf_cpu 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 __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 evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused) +{ + return __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 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; +} + +int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel) +{ + struct evsel *evsel; + int err = 0; + + evlist__for_each_entry(evlist, evsel) { + /* + * filters only work for tracepoint event, which doesn't have cpu limit. + * So evlist and evsel should always be same. + */ + if (evsel->filter) { + err = perf_evsel__apply_filter(&evsel->core, evsel->filter); + if (err) { + *err_evsel = evsel; + break; + } + } + + /* + * non-tracepoint events can have BPF filters. + */ + if (!list_empty(&evsel->bpf_filters)) { + err = perf_bpf_filter__prepare(evsel); + if (err) { + *err_evsel = evsel; + break; + } + } + } + + return err; +} + +int 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 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 evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids) +{ + char *filter = asprintf__tp_filter_pids(npids, pids); + int ret = evlist__set_tp_filter(evlist, filter); + + free(filter); + return ret; +} + +int evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid) +{ + return evlist__set_tp_filter_pids(evlist, 1, &pid); +} + +int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids) +{ + char *filter = asprintf__tp_filter_pids(npids, pids); + int ret = evlist__append_tp_filter(evlist, filter); + + free(filter); + return ret; +} + +int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid) +{ + return 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 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 implies PERF_FORMAT_ID. */ + if ((sample_type & PERF_SAMPLE_READ) && + !(read_format & PERF_FORMAT_ID)) { + return false; + } + + return true; +} + +u16 evlist__id_hdr_size(struct evlist *evlist) +{ + struct evsel *first = evlist__first(evlist); + + return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0; +} + +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 evlist__set_selected(struct evlist *evlist, struct evsel *evsel) +{ + evlist->selected = evsel; +} + +void evlist__close(struct evlist *evlist) +{ + struct evsel *evsel; + struct evlist_cpu_iterator evlist_cpu_itr; + struct affinity affinity; + + /* + * With perf record core.user_requested_cpus is usually NULL. + * Use the old method to handle this for now. + */ + if (!evlist->core.user_requested_cpus || + cpu_map__is_dummy(evlist->core.user_requested_cpus)) { + evlist__for_each_entry_reverse(evlist, evsel) + evsel__close(evsel); + return; + } + + if (affinity__setup(&affinity) < 0) + return; + + evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) { + perf_evsel__close_cpu(&evlist_cpu_itr.evsel->core, + evlist_cpu_itr.cpu_map_idx); + } + + affinity__cleanup(&affinity); + evlist__for_each_entry_reverse(evlist, evsel) { + perf_evsel__free_fd(&evsel->core); + perf_evsel__free_id(&evsel->core); + } + perf_evlist__reset_id_hash(&evlist->core); +} + +static int evlist__create_syswide_maps(struct evlist *evlist) +{ + struct perf_cpu_map *cpus; + struct perf_thread_map *threads; + + /* + * 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 -ENOMEM; +} + +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.user_requested_cpus == NULL) { + err = evlist__create_syswide_maps(evlist); + if (err < 0) + goto out_err; + } + + 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 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); + + /* + * Change the name of this process not to confuse --exclude-perf users + * that sees 'perf' in the window up to the execvp() and thinks that + * perf samples are not being excluded. + */ + prctl(PR_SET_NAME, "perf-exec"); + + /* + * 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 + * 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 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 evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample) +{ + struct evsel *evsel = evlist__event2evsel(evlist, event); + int ret; + + if (!evsel) + return -EFAULT; + ret = evsel__parse_sample(evsel, event, sample); + if (ret) + return ret; + if (perf_guest && sample->id) { + struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id); + + if (sid) { + sample->machine_pid = sid->machine_pid; + sample->vcpu = sid->vcpu.cpu; + } + } + return 0; +} + +int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp) +{ + struct evsel *evsel = 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 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(evsel) == evsel__leader(move_evsel)) + list_move_tail(&evsel->core.node, &move); + } + + list_splice(&move, &evlist->core.entries); +} + +struct evsel *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 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 *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 (evsel__name_is(evsel, str)) + return evsel; + } + + return NULL; +} + +void 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: + evlist__pause(evlist); + break; + case RESUME: + evlist__resume(evlist); + break; + case NONE: + default: + break; + } + +state_err: + return; +} + +bool 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 evlist__force_leader(struct evlist *evlist) +{ + if (evlist__nr_groups(evlist) == 0) { + struct evsel *leader = evlist__first(evlist); + + evlist__set_leader(evlist); + leader->forced_leader = true; + } +} + +struct evsel *evlist__reset_weak_group(struct evlist *evsel_list, struct evsel *evsel, bool close) +{ + struct evsel *c2, *leader; + bool is_open = true; + + leader = evsel__leader(evsel); + + 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 (evsel__has_leader(c2, leader)) { + if (is_open && close) + perf_evsel__close(&c2->core); + /* + * We want to close all members of the group and reopen + * them. Some events, like Intel topdown, require being + * in a group and so keep these in the group. + */ + evsel__remove_from_group(c2, leader); + + /* + * Set this for all former members of the group + * to indicate they get reopened. + */ + c2->reset_group = true; + } + } + /* Reset the leader count if all entries were removed. */ + if (leader->core.nr_members == 1) + leader->core.nr_members = 0; + 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 | + fdarray_flag__non_perf_event); + 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"); + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG, + (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) { + *cmd = EVLIST_CTL_CMD_EVLIST; + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG, + (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) { + *cmd = EVLIST_CTL_CMD_STOP; + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG, + (sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) { + *cmd = EVLIST_CTL_CMD_PING; + } + } + + 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; +} + +static int get_cmd_arg(char *cmd_data, size_t cmd_size, char **arg) +{ + char *data = cmd_data + cmd_size; + + /* no argument */ + if (!*data) + return 0; + + /* there's argument */ + if (*data == ' ') { + *arg = data + 1; + return 1; + } + + /* malformed */ + return -1; +} + +static int evlist__ctlfd_enable(struct evlist *evlist, char *cmd_data, bool enable) +{ + struct evsel *evsel; + char *name; + int err; + + err = get_cmd_arg(cmd_data, + enable ? sizeof(EVLIST_CTL_CMD_ENABLE_TAG) - 1 : + sizeof(EVLIST_CTL_CMD_DISABLE_TAG) - 1, + &name); + if (err < 0) { + pr_info("failed: wrong command\n"); + return -1; + } + + if (err) { + evsel = evlist__find_evsel_by_str(evlist, name); + if (evsel) { + if (enable) + evlist__enable_evsel(evlist, name); + else + evlist__disable_evsel(evlist, name); + pr_info("Event %s %s\n", evsel->name, + enable ? "enabled" : "disabled"); + } else { + pr_info("failed: can't find '%s' event\n", name); + } + } else { + if (enable) { + evlist__enable(evlist); + pr_info(EVLIST_ENABLED_MSG); + } else { + evlist__disable(evlist); + pr_info(EVLIST_DISABLED_MSG); + } + } + + return 0; +} + +static int evlist__ctlfd_list(struct evlist *evlist, char *cmd_data) +{ + struct perf_attr_details details = { .verbose = false, }; + struct evsel *evsel; + char *arg; + int err; + + err = get_cmd_arg(cmd_data, + sizeof(EVLIST_CTL_CMD_EVLIST_TAG) - 1, + &arg); + if (err < 0) { + pr_info("failed: wrong command\n"); + return -1; + } + + if (err) { + if (!strcmp(arg, "-v")) { + details.verbose = true; + } else if (!strcmp(arg, "-g")) { + details.event_group = true; + } else if (!strcmp(arg, "-F")) { + details.freq = true; + } else { + pr_info("failed: wrong command\n"); + return -1; + } + } + + evlist__for_each_entry(evlist, evsel) + evsel__fprintf(evsel, &details, stderr); + + return 0; +} + +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: + case EVLIST_CTL_CMD_DISABLE: + err = evlist__ctlfd_enable(evlist, cmd_data, + *cmd == EVLIST_CTL_CMD_ENABLE); + break; + case EVLIST_CTL_CMD_EVLIST: + err = evlist__ctlfd_list(evlist, cmd_data); + break; + case EVLIST_CTL_CMD_SNAPSHOT: + case EVLIST_CTL_CMD_STOP: + case EVLIST_CTL_CMD_PING: + 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 event_enable_time - perf record -D/--delay single time range. + * @start: start of time range to enable events in milliseconds + * @end: end of time range to enable events in milliseconds + * + * N.B. this structure is also accessed as an array of int. + */ +struct event_enable_time { + int start; + int end; +}; + +static int parse_event_enable_time(const char *str, struct event_enable_time *range, bool first) +{ + const char *fmt = first ? "%u - %u %n" : " , %u - %u %n"; + int ret, start, end, n; + + ret = sscanf(str, fmt, &start, &end, &n); + if (ret != 2 || end <= start) + return -EINVAL; + if (range) { + range->start = start; + range->end = end; + } + return n; +} + +static ssize_t parse_event_enable_times(const char *str, struct event_enable_time *range) +{ + int incr = !!range; + bool first = true; + ssize_t ret, cnt; + + for (cnt = 0; *str; cnt++) { + ret = parse_event_enable_time(str, range, first); + if (ret < 0) + return ret; + /* Check no overlap */ + if (!first && range && range->start <= range[-1].end) + return -EINVAL; + str += ret; + range += incr; + first = false; + } + return cnt; +} + +/** + * struct event_enable_timer - control structure for perf record -D/--delay. + * @evlist: event list + * @times: time ranges that events are enabled (N.B. this is also accessed as an + * array of int) + * @times_cnt: number of time ranges + * @timerfd: timer file descriptor + * @pollfd_pos: position in @evlist array of file descriptors to poll (fdarray) + * @times_step: current position in (int *)@times)[], + * refer event_enable_timer__process() + * + * Note, this structure is only used when there are time ranges, not when there + * is only an initial delay. + */ +struct event_enable_timer { + struct evlist *evlist; + struct event_enable_time *times; + size_t times_cnt; + int timerfd; + int pollfd_pos; + size_t times_step; +}; + +static int str_to_delay(const char *str) +{ + char *endptr; + long d; + + d = strtol(str, &endptr, 10); + if (*endptr || d > INT_MAX || d < -1) + return 0; + return d; +} + +int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *opts, + const char *str, int unset) +{ + enum fdarray_flags flags = fdarray_flag__nonfilterable | fdarray_flag__non_perf_event; + struct event_enable_timer *eet; + ssize_t times_cnt; + ssize_t ret; + int err; + + if (unset) + return 0; + + opts->target.initial_delay = str_to_delay(str); + if (opts->target.initial_delay) + return 0; + + ret = parse_event_enable_times(str, NULL); + if (ret < 0) + return ret; + + times_cnt = ret; + if (times_cnt == 0) + return -EINVAL; + + eet = zalloc(sizeof(*eet)); + if (!eet) + return -ENOMEM; + + eet->times = calloc(times_cnt, sizeof(*eet->times)); + if (!eet->times) { + err = -ENOMEM; + goto free_eet; + } + + if (parse_event_enable_times(str, eet->times) != times_cnt) { + err = -EINVAL; + goto free_eet_times; + } + + eet->times_cnt = times_cnt; + + eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC); + if (eet->timerfd == -1) { + err = -errno; + pr_err("timerfd_create failed: %s\n", strerror(errno)); + goto free_eet_times; + } + + eet->pollfd_pos = perf_evlist__add_pollfd(&evlist->core, eet->timerfd, NULL, POLLIN, flags); + if (eet->pollfd_pos < 0) { + err = eet->pollfd_pos; + goto close_timerfd; + } + + eet->evlist = evlist; + evlist->eet = eet; + opts->target.initial_delay = eet->times[0].start; + + return 0; + +close_timerfd: + close(eet->timerfd); +free_eet_times: + zfree(&eet->times); +free_eet: + free(eet); + return err; +} + +static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms) +{ + struct itimerspec its = { + .it_value.tv_sec = ms / MSEC_PER_SEC, + .it_value.tv_nsec = (ms % MSEC_PER_SEC) * NSEC_PER_MSEC, + }; + int err = 0; + + if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) { + err = -errno; + pr_err("timerfd_settime failed: %s\n", strerror(errno)); + } + return err; +} + +int event_enable_timer__start(struct event_enable_timer *eet) +{ + int ms; + + if (!eet) + return 0; + + ms = eet->times[0].end - eet->times[0].start; + eet->times_step = 1; + + return event_enable_timer__set_timer(eet, ms); +} + +int event_enable_timer__process(struct event_enable_timer *eet) +{ + struct pollfd *entries; + short revents; + + if (!eet) + return 0; + + entries = eet->evlist->core.pollfd.entries; + revents = entries[eet->pollfd_pos].revents; + entries[eet->pollfd_pos].revents = 0; + + if (revents & POLLIN) { + size_t step = eet->times_step; + size_t pos = step / 2; + + if (step & 1) { + evlist__disable_non_dummy(eet->evlist); + pr_info(EVLIST_DISABLED_MSG); + if (pos >= eet->times_cnt - 1) { + /* Disarm timer */ + event_enable_timer__set_timer(eet, 0); + return 1; /* Stop */ + } + } else { + evlist__enable_non_dummy(eet->evlist); + pr_info(EVLIST_ENABLED_MSG); + } + + step += 1; + pos = step / 2; + + if (pos < eet->times_cnt) { + int *times = (int *)eet->times; /* Accessing 'times' as array of int */ + int ms = times[step] - times[step - 1]; + + eet->times_step = step; + return event_enable_timer__set_timer(eet, ms); + } + } + + return 0; +} + +void event_enable_timer__exit(struct event_enable_timer **ep) +{ + if (!ep || !*ep) + return; + zfree(&(*ep)->times); + zfree(ep); +} + +struct evsel *evlist__find_evsel(struct evlist *evlist, int idx) +{ + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) { + if (evsel->core.idx == idx) + return evsel; + } + return NULL; +} + +int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf) +{ + struct evsel *evsel; + int printed = 0; + + evlist__for_each_entry(evlist, evsel) { + if (evsel__is_dummy_event(evsel)) + continue; + if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) { + printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel)); + } else { + printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : ""); + break; + } + } + + return printed; +} + +void evlist__check_mem_load_aux(struct evlist *evlist) +{ + struct evsel *leader, *evsel, *pos; + + /* + * For some platforms, the 'mem-loads' event is required to use + * together with 'mem-loads-aux' within a group and 'mem-loads-aux' + * must be the group leader. Now we disable this group before reporting + * because 'mem-loads-aux' is just an auxiliary event. It doesn't carry + * any valid memory load information. + */ + evlist__for_each_entry(evlist, evsel) { + leader = evsel__leader(evsel); + if (leader == evsel) + continue; + + if (leader->name && strstr(leader->name, "mem-loads-aux")) { + for_each_group_evsel(pos, leader) { + evsel__set_leader(pos, pos); + pos->core.nr_members = 0; + } + } + } +} + +/** + * evlist__warn_user_requested_cpus() - Check each evsel against requested CPUs + * and warn if the user CPU list is inapplicable for the event's PMU's + * CPUs. Not core PMUs list a CPU in sysfs, but this may be overwritten by a + * user requested CPU and so any online CPU is applicable. Core PMUs handle + * events on the CPUs in their list and otherwise the event isn't supported. + * @evlist: The list of events being checked. + * @cpu_list: The user provided list of CPUs. + */ +void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_list) +{ + struct perf_cpu_map *user_requested_cpus; + struct evsel *pos; + + if (!cpu_list) + return; + + user_requested_cpus = perf_cpu_map__new(cpu_list); + if (!user_requested_cpus) + return; + + evlist__for_each_entry(evlist, pos) { + struct perf_cpu_map *intersect, *to_test; + const struct perf_pmu *pmu = evsel__find_pmu(pos); + + to_test = pmu && pmu->is_core ? pmu->cpus : cpu_map__online(); + intersect = perf_cpu_map__intersect(to_test, user_requested_cpus); + if (!perf_cpu_map__equal(intersect, user_requested_cpus)) { + char buf[128]; + + cpu_map__snprint(to_test, buf, sizeof(buf)); + pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n", + cpu_list, pmu ? pmu->name : "cpu", buf, evsel__name(pos)); + } + perf_cpu_map__put(intersect); + } + perf_cpu_map__put(user_requested_cpus); +} |