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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <perf/evsel.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <linux/list.h>
#include <internal/evsel.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include <internal/xyarray.h>
#include <internal/cpumap.h>
#include <internal/threadmap.h>
#include <internal/lib.h>
#include <linux/string.h>
#include <sys/ioctl.h>
void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr)
{
INIT_LIST_HEAD(&evsel->node);
evsel->attr = *attr;
}
struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
{
struct perf_evsel *evsel = zalloc(sizeof(*evsel));
if (evsel != NULL)
perf_evsel__init(evsel, attr);
return evsel;
}
void perf_evsel__delete(struct perf_evsel *evsel)
{
free(evsel);
}
#define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y))
int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
{
evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
if (evsel->fd) {
int cpu, thread;
for (cpu = 0; cpu < ncpus; cpu++) {
for (thread = 0; thread < nthreads; thread++) {
FD(evsel, cpu, thread) = -1;
}
}
}
return evsel->fd != NULL ? 0 : -ENOMEM;
}
static int
sys_perf_event_open(struct perf_event_attr *attr,
pid_t pid, int cpu, int group_fd,
unsigned long flags)
{
return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
}
int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
struct perf_thread_map *threads)
{
int cpu, thread, err = 0;
if (cpus == NULL) {
static struct perf_cpu_map *empty_cpu_map;
if (empty_cpu_map == NULL) {
empty_cpu_map = perf_cpu_map__dummy_new();
if (empty_cpu_map == NULL)
return -ENOMEM;
}
cpus = empty_cpu_map;
}
if (threads == NULL) {
static struct perf_thread_map *empty_thread_map;
if (empty_thread_map == NULL) {
empty_thread_map = perf_thread_map__new_dummy();
if (empty_thread_map == NULL)
return -ENOMEM;
}
threads = empty_thread_map;
}
if (evsel->fd == NULL &&
perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
return -ENOMEM;
for (cpu = 0; cpu < cpus->nr; cpu++) {
for (thread = 0; thread < threads->nr; thread++) {
int fd;
fd = sys_perf_event_open(&evsel->attr,
threads->map[thread].pid,
cpus->map[cpu], -1, 0);
if (fd < 0)
return -errno;
FD(evsel, cpu, thread) = fd;
}
}
return err;
}
void perf_evsel__close_fd(struct perf_evsel *evsel)
{
int cpu, thread;
for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
close(FD(evsel, cpu, thread));
FD(evsel, cpu, thread) = -1;
}
}
void perf_evsel__free_fd(struct perf_evsel *evsel)
{
xyarray__delete(evsel->fd);
evsel->fd = NULL;
}
void perf_evsel__close(struct perf_evsel *evsel)
{
if (evsel->fd == NULL)
return;
perf_evsel__close_fd(evsel);
perf_evsel__free_fd(evsel);
}
int perf_evsel__read_size(struct perf_evsel *evsel)
{
u64 read_format = evsel->attr.read_format;
int entry = sizeof(u64); /* value */
int size = 0;
int nr = 1;
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
size += sizeof(u64);
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
size += sizeof(u64);
if (read_format & PERF_FORMAT_ID)
entry += sizeof(u64);
if (read_format & PERF_FORMAT_GROUP) {
nr = evsel->nr_members;
size += sizeof(u64);
}
size += entry * nr;
return size;
}
int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
struct perf_counts_values *count)
{
size_t size = perf_evsel__read_size(evsel);
memset(count, 0, sizeof(*count));
if (FD(evsel, cpu, thread) < 0)
return -EINVAL;
if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
return -errno;
return 0;
}
static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
int ioc, void *arg)
{
int cpu, thread;
for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
int fd = FD(evsel, cpu, thread),
err = ioctl(fd, ioc, arg);
if (err)
return err;
}
}
return 0;
}
int perf_evsel__enable(struct perf_evsel *evsel)
{
return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0);
}
int perf_evsel__disable(struct perf_evsel *evsel)
{
return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0);
}
int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
{
return perf_evsel__run_ioctl(evsel,
PERF_EVENT_IOC_SET_FILTER,
(void *)filter);
}
struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
{
return evsel->cpus;
}
struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel)
{
return evsel->threads;
}
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