evlist.c 27.7 KB
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/*
 * 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.
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */
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#include "util.h"
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#include <lk/debugfs.h>
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#include <poll.h>
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#include "cpumap.h"
#include "thread_map.h"
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#include "target.h"
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#include "evlist.h"
#include "evsel.h"
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Adrian Hunter 已提交
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#include "debug.h"
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#include <unistd.h>
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#include "parse-events.h"
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#include "parse-options.h"
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#include <sys/mman.h>

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#include <linux/bitops.h>
#include <linux/hash.h>

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#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
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#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
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void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
		       struct thread_map *threads)
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{
	int i;

	for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
		INIT_HLIST_HEAD(&evlist->heads[i]);
	INIT_LIST_HEAD(&evlist->entries);
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	perf_evlist__set_maps(evlist, cpus, threads);
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	evlist->workload.pid = -1;
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}

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struct perf_evlist *perf_evlist__new(void)
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{
	struct perf_evlist *evlist = zalloc(sizeof(*evlist));

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	if (evlist != NULL)
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		perf_evlist__init(evlist, NULL, NULL);
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	return evlist;
}

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struct perf_evlist *perf_evlist__new_default(void)
{
	struct perf_evlist *evlist = perf_evlist__new();

	if (evlist && perf_evlist__add_default(evlist)) {
		perf_evlist__delete(evlist);
		evlist = NULL;
	}

	return evlist;
}

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/**
 * 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 perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);

	evlist->id_pos = first->id_pos;
	evlist->is_pos = first->is_pos;
}

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static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;

	list_for_each_entry(evsel, &evlist->entries, node)
		perf_evsel__calc_id_pos(evsel);

	perf_evlist__set_id_pos(evlist);
}

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static void perf_evlist__purge(struct perf_evlist *evlist)
{
	struct perf_evsel *pos, *n;

	list_for_each_entry_safe(pos, n, &evlist->entries, node) {
		list_del_init(&pos->node);
		perf_evsel__delete(pos);
	}

	evlist->nr_entries = 0;
}

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void perf_evlist__exit(struct perf_evlist *evlist)
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{
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	free(evlist->mmap);
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	free(evlist->pollfd);
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	evlist->mmap = NULL;
	evlist->pollfd = NULL;
}

void perf_evlist__delete(struct perf_evlist *evlist)
{
	perf_evlist__purge(evlist);
	perf_evlist__exit(evlist);
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	free(evlist);
}

void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
{
	list_add_tail(&entry->node, &evlist->entries);
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	entry->idx = evlist->nr_entries;

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	if (!evlist->nr_entries++)
		perf_evlist__set_id_pos(evlist);
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}

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void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
				   struct list_head *list,
				   int nr_entries)
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{
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	bool set_id_pos = !evlist->nr_entries;

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	list_splice_tail(list, &evlist->entries);
	evlist->nr_entries += nr_entries;
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	if (set_id_pos)
		perf_evlist__set_id_pos(evlist);
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}

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void __perf_evlist__set_leader(struct list_head *list)
{
	struct perf_evsel *evsel, *leader;

	leader = list_entry(list->next, struct perf_evsel, node);
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	evsel = list_entry(list->prev, struct perf_evsel, node);

	leader->nr_members = evsel->idx - leader->idx + 1;
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	list_for_each_entry(evsel, list, node) {
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		evsel->leader = leader;
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	}
}

void perf_evlist__set_leader(struct perf_evlist *evlist)
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{
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	if (evlist->nr_entries) {
		evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
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		__perf_evlist__set_leader(&evlist->entries);
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	}
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}

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int perf_evlist__add_default(struct perf_evlist *evlist)
{
	struct perf_event_attr attr = {
		.type = PERF_TYPE_HARDWARE,
		.config = PERF_COUNT_HW_CPU_CYCLES,
	};
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	struct perf_evsel *evsel;

	event_attr_init(&attr);
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	evsel = perf_evsel__new(&attr);
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	if (evsel == NULL)
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		goto error;

	/* use strdup() because free(evsel) assumes name is allocated */
	evsel->name = strdup("cycles");
	if (!evsel->name)
		goto error_free;
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	perf_evlist__add(evlist, evsel);
	return 0;
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error_free:
	perf_evsel__delete(evsel);
error:
	return -ENOMEM;
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}
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static int perf_evlist__add_attrs(struct perf_evlist *evlist,
				  struct perf_event_attr *attrs, size_t nr_attrs)
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{
	struct perf_evsel *evsel, *n;
	LIST_HEAD(head);
	size_t i;

	for (i = 0; i < nr_attrs; i++) {
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		evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
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		if (evsel == NULL)
			goto out_delete_partial_list;
		list_add_tail(&evsel->node, &head);
	}

	perf_evlist__splice_list_tail(evlist, &head, nr_attrs);

	return 0;

out_delete_partial_list:
	list_for_each_entry_safe(evsel, n, &head, node)
		perf_evsel__delete(evsel);
	return -1;
}

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int __perf_evlist__add_default_attrs(struct perf_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 perf_evlist__add_attrs(evlist, attrs, nr_attrs);
}

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struct perf_evsel *
perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
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{
	struct perf_evsel *evsel;

	list_for_each_entry(evsel, &evlist->entries, node) {
		if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
		    (int)evsel->attr.config == id)
			return evsel;
	}

	return NULL;
}

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struct perf_evsel *
perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
				     const char *name)
{
	struct perf_evsel *evsel;

	list_for_each_entry(evsel, &evlist->entries, node) {
		if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
		    (strcmp(evsel->name, name) == 0))
			return evsel;
	}

	return NULL;
}

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int perf_evlist__add_newtp(struct perf_evlist *evlist,
			   const char *sys, const char *name, void *handler)
{
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	struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
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	if (evsel == NULL)
		return -1;

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	evsel->handler = handler;
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	perf_evlist__add(evlist, evsel);
	return 0;
}

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void perf_evlist__disable(struct perf_evlist *evlist)
{
	int cpu, thread;
	struct perf_evsel *pos;
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
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	for (cpu = 0; cpu < nr_cpus; cpu++) {
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		list_for_each_entry(pos, &evlist->entries, node) {
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			if (!perf_evsel__is_group_leader(pos) || !pos->fd)
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				continue;
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			for (thread = 0; thread < nr_threads; thread++)
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				ioctl(FD(pos, cpu, thread),
				      PERF_EVENT_IOC_DISABLE, 0);
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		}
	}
}

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void perf_evlist__enable(struct perf_evlist *evlist)
{
	int cpu, thread;
	struct perf_evsel *pos;
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
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	for (cpu = 0; cpu < nr_cpus; cpu++) {
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		list_for_each_entry(pos, &evlist->entries, node) {
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			if (!perf_evsel__is_group_leader(pos) || !pos->fd)
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				continue;
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			for (thread = 0; thread < nr_threads; thread++)
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				ioctl(FD(pos, cpu, thread),
				      PERF_EVENT_IOC_ENABLE, 0);
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		}
	}
}

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int perf_evlist__disable_event(struct perf_evlist *evlist,
			       struct perf_evsel *evsel)
{
	int cpu, thread, err;

	if (!evsel->fd)
		return 0;

	for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
		for (thread = 0; thread < evlist->threads->nr; thread++) {
			err = ioctl(FD(evsel, cpu, thread),
				    PERF_EVENT_IOC_DISABLE, 0);
			if (err)
				return err;
		}
	}
	return 0;
}

int perf_evlist__enable_event(struct perf_evlist *evlist,
			      struct perf_evsel *evsel)
{
	int cpu, thread, err;

	if (!evsel->fd)
		return -EINVAL;

	for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
		for (thread = 0; thread < evlist->threads->nr; thread++) {
			err = ioctl(FD(evsel, cpu, thread),
				    PERF_EVENT_IOC_ENABLE, 0);
			if (err)
				return err;
		}
	}
	return 0;
}

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static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
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{
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
	int nfds = nr_cpus * nr_threads * evlist->nr_entries;
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	evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
	return evlist->pollfd != NULL ? 0 : -ENOMEM;
}
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void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
{
	fcntl(fd, F_SETFL, O_NONBLOCK);
	evlist->pollfd[evlist->nr_fds].fd = fd;
	evlist->pollfd[evlist->nr_fds].events = POLLIN;
	evlist->nr_fds++;
}
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static void perf_evlist__id_hash(struct perf_evlist *evlist,
				 struct perf_evsel *evsel,
				 int cpu, int thread, u64 id)
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{
	int hash;
	struct perf_sample_id *sid = SID(evsel, cpu, thread);

	sid->id = id;
	sid->evsel = evsel;
	hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
	hlist_add_head(&sid->node, &evlist->heads[hash]);
}

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void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
			 int cpu, int thread, u64 id)
{
	perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
	evsel->id[evsel->ids++] = id;
}

static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
				  struct perf_evsel *evsel,
				  int cpu, int thread, int fd)
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{
	u64 read_data[4] = { 0, };
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	int id_idx = 1; /* The first entry is the counter value */
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	u64 id;
	int ret;

	ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
	if (!ret)
		goto add;

	if (errno != ENOTTY)
		return -1;

	/* Legacy way to get event id.. All hail to old kernels! */
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	/*
	 * This way does not work with group format read, so bail
	 * out in that case.
	 */
	if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
		return -1;

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	if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
	    read(fd, &read_data, sizeof(read_data)) == -1)
		return -1;

	if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
		++id_idx;
	if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
		++id_idx;

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	id = read_data[id_idx];

 add:
	perf_evlist__id_add(evlist, evsel, cpu, thread, id);
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	return 0;
}

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struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
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{
	struct hlist_head *head;
	struct perf_sample_id *sid;
	int hash;

	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
	head = &evlist->heads[hash];

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	hlist_for_each_entry(sid, head, node)
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		if (sid->id == id)
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			return sid;

	return NULL;
}

struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
{
	struct perf_sample_id *sid;

	if (evlist->nr_entries == 1)
		return perf_evlist__first(evlist);

	sid = perf_evlist__id2sid(evlist, id);
	if (sid)
		return sid->evsel;
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	if (!perf_evlist__sample_id_all(evlist))
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		return perf_evlist__first(evlist);
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	return NULL;
}
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static int perf_evlist__event2id(struct perf_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;
}

static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
						   union perf_event *event)
{
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	struct perf_evsel *first = perf_evlist__first(evlist);
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	struct hlist_head *head;
	struct perf_sample_id *sid;
	int hash;
	u64 id;

	if (evlist->nr_entries == 1)
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		return first;

	if (!first->attr.sample_id_all &&
	    event->header.type != PERF_RECORD_SAMPLE)
		return first;
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	if (perf_evlist__event2id(evlist, event, &id))
		return NULL;

	/* Synthesized events have an id of zero */
	if (!id)
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		return first;
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	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
	head = &evlist->heads[hash];

	hlist_for_each_entry(sid, head, node) {
		if (sid->id == id)
			return sid->evsel;
	}
	return NULL;
}

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union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
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{
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	struct perf_mmap *md = &evlist->mmap[idx];
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	unsigned int head = perf_mmap__read_head(md);
	unsigned int old = md->prev;
	unsigned char *data = md->base + page_size;
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	union perf_event *event = NULL;
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	if (evlist->overwrite) {
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		/*
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		 * If we're further behind than half the buffer, there's a chance
		 * the writer will bite our tail and mess up the samples under us.
		 *
		 * If we somehow ended up ahead of the head, we got messed up.
		 *
		 * In either case, truncate and restart at head.
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		 */
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		int diff = head - old;
		if (diff > md->mask / 2 || diff < 0) {
			fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");

			/*
			 * head points to a known good entry, start there.
			 */
			old = head;
		}
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	}

	if (old != head) {
		size_t size;

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		event = (union perf_event *)&data[old & md->mask];
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		size = event->header.size;

		/*
		 * Event straddles the mmap boundary -- header should always
		 * be inside due to u64 alignment of output.
		 */
		if ((old & md->mask) + size != ((old + size) & md->mask)) {
			unsigned int offset = old;
			unsigned int len = min(sizeof(*event), size), cpy;
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			void *dst = md->event_copy;
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			do {
				cpy = min(md->mask + 1 - (offset & md->mask), len);
				memcpy(dst, &data[offset & md->mask], cpy);
				offset += cpy;
				dst += cpy;
				len -= cpy;
			} while (len);

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			event = (union perf_event *) md->event_copy;
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		}

		old += size;
	}

	md->prev = old;
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	return event;
}
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void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
{
	if (!evlist->overwrite) {
		struct perf_mmap *md = &evlist->mmap[idx];
		unsigned int old = md->prev;

		perf_mmap__write_tail(md, old);
	}
}

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static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
{
	if (evlist->mmap[idx].base != NULL) {
		munmap(evlist->mmap[idx].base, evlist->mmap_len);
		evlist->mmap[idx].base = NULL;
	}
}

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void perf_evlist__munmap(struct perf_evlist *evlist)
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{
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	int i;
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	for (i = 0; i < evlist->nr_mmaps; i++)
		__perf_evlist__munmap(evlist, i);
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	free(evlist->mmap);
	evlist->mmap = NULL;
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}

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static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
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{
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	evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
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	if (cpu_map__empty(evlist->cpus))
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		evlist->nr_mmaps = thread_map__nr(evlist->threads);
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	evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
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	return evlist->mmap != NULL ? 0 : -ENOMEM;
}

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static int __perf_evlist__mmap(struct perf_evlist *evlist,
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			       int idx, int prot, int mask, int fd)
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{
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	evlist->mmap[idx].prev = 0;
	evlist->mmap[idx].mask = mask;
	evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
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				      MAP_SHARED, fd, 0);
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	if (evlist->mmap[idx].base == MAP_FAILED) {
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		pr_debug2("failed to mmap perf event ring buffer, error %d\n",
			  errno);
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		evlist->mmap[idx].base = NULL;
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		return -1;
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	}
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	perf_evlist__add_pollfd(evlist, fd);
	return 0;
}

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static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
				       int prot, int mask, int cpu, int thread,
				       int *output)
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{
	struct perf_evsel *evsel;
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	list_for_each_entry(evsel, &evlist->entries, node) {
		int fd = FD(evsel, cpu, thread);

		if (*output == -1) {
			*output = fd;
			if (__perf_evlist__mmap(evlist, idx, prot, mask,
						*output) < 0)
				return -1;
		} else {
			if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
				return -1;
		}

		if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
		    perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
			return -1;
	}

	return 0;
}

static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
				     int mask)
{
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	int cpu, thread;
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
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A
Adrian Hunter 已提交
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	pr_debug2("perf event ring buffer mmapped per cpu\n");
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	for (cpu = 0; cpu < nr_cpus; cpu++) {
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		int output = -1;

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		for (thread = 0; thread < nr_threads; thread++) {
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			if (perf_evlist__mmap_per_evsel(evlist, cpu, prot, mask,
							cpu, thread, &output))
				goto out_unmap;
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		}
	}

	return 0;

out_unmap:
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	for (cpu = 0; cpu < nr_cpus; cpu++)
		__perf_evlist__munmap(evlist, cpu);
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	return -1;
}

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static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
					int mask)
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{
	int thread;
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	int nr_threads = thread_map__nr(evlist->threads);
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A
Adrian Hunter 已提交
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	pr_debug2("perf event ring buffer mmapped per thread\n");
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	for (thread = 0; thread < nr_threads; thread++) {
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		int output = -1;

684 685 686
		if (perf_evlist__mmap_per_evsel(evlist, thread, prot, mask, 0,
						thread, &output))
			goto out_unmap;
687 688 689 690 691
	}

	return 0;

out_unmap:
692 693
	for (thread = 0; thread < nr_threads; thread++)
		__perf_evlist__munmap(evlist, thread);
694 695 696
	return -1;
}

697 698 699 700 701 702 703 704 705 706 707
static size_t perf_evlist__mmap_size(unsigned long pages)
{
	/* 512 kiB: default amount of unprivileged mlocked memory */
	if (pages == UINT_MAX)
		pages = (512 * 1024) / page_size;
	else if (!is_power_of_2(pages))
		return 0;

	return (pages + 1) * page_size;
}

708 709
static long parse_pages_arg(const char *str, unsigned long min,
			    unsigned long max)
710
{
711
	unsigned long pages, val;
712 713 714 715 716 717 718
	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 },
	};
719

720
	if (str == NULL)
721
		return -EINVAL;
722

723
	val = parse_tag_value(str, tags);
724
	if (val != (unsigned long) -1) {
725 726 727 728 729 730
		/* 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);
731 732
		if (*eptr != '\0')
			return -EINVAL;
733 734
	}

735
	if (pages == 0 && min == 0) {
736 737 738
		/* leave number of pages at 0 */
	} else if (pages < (1UL << 31) && !is_power_of_2(pages)) {
		/* round pages up to next power of 2 */
739 740 741
		pages = next_pow2(pages);
		pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
			pages * page_size, pages);
742 743
	}

744 745 746 747 748 749 750 751 752 753 754 755 756
	if (pages > max)
		return -EINVAL;

	return pages;
}

int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
				  int unset __maybe_unused)
{
	unsigned int *mmap_pages = opt->value;
	unsigned long max = UINT_MAX;
	long pages;

A
Adrian Hunter 已提交
757
	if (max > SIZE_MAX / page_size)
758 759 760 761 762
		max = SIZE_MAX / page_size;

	pages = parse_pages_arg(str, 1, max);
	if (pages < 0) {
		pr_err("Invalid argument for --mmap_pages/-m\n");
763 764 765 766 767 768 769
		return -1;
	}

	*mmap_pages = pages;
	return 0;
}

770 771 772 773 774
/**
 * perf_evlist__mmap - Create mmaps to receive events.
 * @evlist: list of events
 * @pages: map length in pages
 * @overwrite: overwrite older events?
775
 *
776 777 778
 * If @overwrite is %false the user needs to signal event consumption using
 * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
 * automatically.
779
 *
780
 * Return: %0 on success, negative error code otherwise.
781
 */
782 783
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
		      bool overwrite)
784
{
785
	struct perf_evsel *evsel;
786 787
	const struct cpu_map *cpus = evlist->cpus;
	const struct thread_map *threads = evlist->threads;
788 789
	int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;

790
	if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
791 792
		return -ENOMEM;

793
	if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
794 795 796
		return -ENOMEM;

	evlist->overwrite = overwrite;
797
	evlist->mmap_len = perf_evlist__mmap_size(pages);
798
	pr_debug("mmap size %zuB\n", evlist->mmap_len);
799
	mask = evlist->mmap_len - page_size - 1;
800 801 802

	list_for_each_entry(evsel, &evlist->entries, node) {
		if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
803
		    evsel->sample_id == NULL &&
804
		    perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
805 806 807
			return -ENOMEM;
	}

808
	if (cpu_map__empty(cpus))
809
		return perf_evlist__mmap_per_thread(evlist, prot, mask);
810

811
	return perf_evlist__mmap_per_cpu(evlist, prot, mask);
812
}
813

814
int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
815
{
816 817
	evlist->threads = thread_map__new_str(target->pid, target->tid,
					      target->uid);
818 819 820 821

	if (evlist->threads == NULL)
		return -1;

822
	if (target__uses_dummy_map(target))
N
Namhyung Kim 已提交
823
		evlist->cpus = cpu_map__dummy_new();
824 825
	else
		evlist->cpus = cpu_map__new(target->cpu_list);
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843

	if (evlist->cpus == NULL)
		goto out_delete_threads;

	return 0;

out_delete_threads:
	thread_map__delete(evlist->threads);
	return -1;
}

void perf_evlist__delete_maps(struct perf_evlist *evlist)
{
	cpu_map__delete(evlist->cpus);
	thread_map__delete(evlist->threads);
	evlist->cpus	= NULL;
	evlist->threads = NULL;
}
844

845
int perf_evlist__apply_filters(struct perf_evlist *evlist)
846 847
{
	struct perf_evsel *evsel;
848 849
	int err = 0;
	const int ncpus = cpu_map__nr(evlist->cpus),
850
		  nthreads = thread_map__nr(evlist->threads);
851 852

	list_for_each_entry(evsel, &evlist->entries, node) {
853
		if (evsel->filter == NULL)
854
			continue;
855 856 857 858

		err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
		if (err)
			break;
859 860
	}

861 862 863 864 865 866 867 868
	return err;
}

int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
{
	struct perf_evsel *evsel;
	int err = 0;
	const int ncpus = cpu_map__nr(evlist->cpus),
869
		  nthreads = thread_map__nr(evlist->threads);
870 871 872 873 874 875 876 877

	list_for_each_entry(evsel, &evlist->entries, node) {
		err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
		if (err)
			break;
	}

	return err;
878
}
879

880
bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
881
{
882
	struct perf_evsel *pos;
883

884 885 886 887 888 889 890 891 892
	if (evlist->nr_entries == 1)
		return true;

	if (evlist->id_pos < 0 || evlist->is_pos < 0)
		return false;

	list_for_each_entry(pos, &evlist->entries, node) {
		if (pos->id_pos != evlist->id_pos ||
		    pos->is_pos != evlist->is_pos)
893
			return false;
894 895
	}

896
	return true;
897 898
}

899
u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
900
{
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915
	struct perf_evsel *evsel;

	if (evlist->combined_sample_type)
		return evlist->combined_sample_type;

	list_for_each_entry(evsel, &evlist->entries, node)
		evlist->combined_sample_type |= evsel->attr.sample_type;

	return evlist->combined_sample_type;
}

u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
{
	evlist->combined_sample_type = 0;
	return __perf_evlist__combined_sample_type(evlist);
916 917
}

918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943
bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
	u64 read_format = first->attr.read_format;
	u64 sample_type = first->attr.sample_type;

	list_for_each_entry_continue(pos, &evlist->entries, node) {
		if (read_format != pos->attr.read_format)
			return false;
	}

	/* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
	if ((sample_type & PERF_SAMPLE_READ) &&
	    !(read_format & PERF_FORMAT_ID)) {
		return false;
	}

	return true;
}

u64 perf_evlist__read_format(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);
	return first->attr.read_format;
}

944
u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
945
{
946
	struct perf_evsel *first = perf_evlist__first(evlist);
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
	struct perf_sample *data;
	u64 sample_type;
	u16 size = 0;

	if (!first->attr.sample_id_all)
		goto out;

	sample_type = first->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;
970 971 972

	if (sample_type & PERF_SAMPLE_IDENTIFIER)
		size += sizeof(data->id);
973 974 975 976
out:
	return size;
}

977
bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
978
{
979
	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
980 981 982 983

	list_for_each_entry_continue(pos, &evlist->entries, node) {
		if (first->attr.sample_id_all != pos->attr.sample_id_all)
			return false;
984 985
	}

986 987 988
	return true;
}

989
bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
990
{
991
	struct perf_evsel *first = perf_evlist__first(evlist);
992
	return first->attr.sample_id_all;
993
}
994 995 996 997 998 999

void perf_evlist__set_selected(struct perf_evlist *evlist,
			       struct perf_evsel *evsel)
{
	evlist->selected = evsel;
}
1000

1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
void perf_evlist__close(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;
	int ncpus = cpu_map__nr(evlist->cpus);
	int nthreads = thread_map__nr(evlist->threads);

	list_for_each_entry_reverse(evsel, &evlist->entries, node)
		perf_evsel__close(evsel, ncpus, nthreads);
}

1011
int perf_evlist__open(struct perf_evlist *evlist)
1012
{
1013
	struct perf_evsel *evsel;
1014
	int err;
1015

1016 1017
	perf_evlist__update_id_pos(evlist);

1018
	list_for_each_entry(evsel, &evlist->entries, node) {
1019
		err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
1020 1021 1022 1023 1024 1025
		if (err < 0)
			goto out_err;
	}

	return 0;
out_err:
1026
	perf_evlist__close(evlist);
1027
	errno = -err;
1028 1029
	return err;
}
1030

1031
int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1032 1033
				  const char *argv[], bool pipe_output,
				  bool want_signal)
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
{
	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) {
1055
		if (pipe_output)
1056 1057
			dup2(2, 1);

1058 1059
		signal(SIGTERM, SIG_DFL);

1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
		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.
		 */
		if (read(go_pipe[0], &bf, 1) == -1)
			perror("unable to read pipe");

		execvp(argv[0], (char **)argv);

		perror(argv[0]);
1078 1079
		if (want_signal)
			kill(getppid(), SIGUSR1);
1080 1081 1082
		exit(-1);
	}

1083
	if (target__none(target))
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
		evlist->threads->map[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;
	}

1096
	fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	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 perf_evlist *evlist)
{
	if (evlist->workload.cork_fd > 0) {
1113
		char bf = 0;
1114
		int ret;
1115 1116 1117
		/*
		 * Remove the cork, let it rip!
		 */
1118 1119 1120 1121 1122 1123
		ret = write(evlist->workload.cork_fd, &bf, 1);
		if (ret < 0)
			perror("enable to write to pipe");

		close(evlist->workload.cork_fd);
		return ret;
1124 1125 1126 1127
	}

	return 0;
}
1128

1129
int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1130
			      struct perf_sample *sample)
1131
{
1132 1133 1134 1135
	struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);

	if (!evsel)
		return -EFAULT;
1136
	return perf_evsel__parse_sample(evsel, event, sample);
1137
}
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148

size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
{
	struct perf_evsel *evsel;
	size_t printed = 0;

	list_for_each_entry(evsel, &evlist->entries, node) {
		printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
				   perf_evsel__name(evsel));
	}

1149
	return printed + fprintf(fp, "\n");
1150
}
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177

int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
			     int err, char *buf, size_t size)
{
	char sbuf[128];

	switch (err) {
	case ENOENT:
		scnprintf(buf, size, "%s",
			  "Error:\tUnable to find debugfs\n"
			  "Hint:\tWas your kernel was compiled with debugfs support?\n"
			  "Hint:\tIs the debugfs filesystem mounted?\n"
			  "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
		break;
	case EACCES:
		scnprintf(buf, size,
			  "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
			  "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
			  debugfs_mountpoint, debugfs_mountpoint);
		break;
	default:
		scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
		break;
	}

	return 0;
}
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213

int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
			       int err, char *buf, size_t size)
{
	int printed, value;
	char sbuf[128], *emsg = strerror_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);

		if (filename__read_int("/proc/sys/kernel/perf_event_paranoid", &value))
			break;

		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");

		printed += scnprintf(buf + printed, size - printed,
				    ".\nHint:\tThe current value is %d.", value);
		break;
	default:
		scnprintf(buf, size, "%s", emsg);
		break;
	}

	return 0;
}