diff options
Diffstat (limited to 'tools/perf/util/evlist.c')
| -rw-r--r-- | tools/perf/util/evlist.c | 1990 |
1 files changed, 1990 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c new file mode 100644 index 000000000..98ae43247 --- /dev/null +++ b/tools/perf/util/evlist.c @@ -0,0 +1,1990 @@ +// 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; +} |