blob: 8ec0148d7426d14c49407d4ea017e02575c6c0ba [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2018 Netronome Systems, Inc. */
/* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*/
#include <errno.h>
#include <fcntl.h>
#include <libbpf.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <linux/bpf.h>
#include <linux/perf_event.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <bpf.h>
#include <perf-sys.h>
#include "main.h"
#define MMAP_PAGE_CNT 16
static bool stop;
struct event_ring_info {
int fd;
int key;
unsigned int cpu;
void *mem;
};
struct perf_event_sample {
struct perf_event_header header;
u64 time;
__u32 size;
unsigned char data[];
};
static void int_exit(int signo)
{
fprintf(stderr, "Stopping...\n");
stop = true;
}
static enum bpf_perf_event_ret print_bpf_output(void *event, void *priv)
{
struct event_ring_info *ring = priv;
struct perf_event_sample *e = event;
struct {
struct perf_event_header header;
__u64 id;
__u64 lost;
} *lost = event;
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "type");
jsonw_uint(json_wtr, e->header.type);
jsonw_name(json_wtr, "cpu");
jsonw_uint(json_wtr, ring->cpu);
jsonw_name(json_wtr, "index");
jsonw_uint(json_wtr, ring->key);
if (e->header.type == PERF_RECORD_SAMPLE) {
jsonw_name(json_wtr, "timestamp");
jsonw_uint(json_wtr, e->time);
jsonw_name(json_wtr, "data");
print_data_json(e->data, e->size);
} else if (e->header.type == PERF_RECORD_LOST) {
jsonw_name(json_wtr, "lost");
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "id");
jsonw_uint(json_wtr, lost->id);
jsonw_name(json_wtr, "count");
jsonw_uint(json_wtr, lost->lost);
jsonw_end_object(json_wtr);
}
jsonw_end_object(json_wtr);
} else {
if (e->header.type == PERF_RECORD_SAMPLE) {
printf("== @%lld.%09lld CPU: %d index: %d =====\n",
e->time / 1000000000ULL, e->time % 1000000000ULL,
ring->cpu, ring->key);
fprint_hex(stdout, e->data, e->size, " ");
printf("\n");
} else if (e->header.type == PERF_RECORD_LOST) {
printf("lost %lld events\n", lost->lost);
} else {
printf("unknown event type=%d size=%d\n",
e->header.type, e->header.size);
}
}
return LIBBPF_PERF_EVENT_CONT;
}
static void
perf_event_read(struct event_ring_info *ring, void **buf, size_t *buf_len)
{
enum bpf_perf_event_ret ret;
ret = bpf_perf_event_read_simple(ring->mem,
MMAP_PAGE_CNT * get_page_size(),
get_page_size(), buf, buf_len,
print_bpf_output, ring);
if (ret != LIBBPF_PERF_EVENT_CONT) {
fprintf(stderr, "perf read loop failed with %d\n", ret);
stop = true;
}
}
static int perf_mmap_size(void)
{
return get_page_size() * (MMAP_PAGE_CNT + 1);
}
static void *perf_event_mmap(int fd)
{
int mmap_size = perf_mmap_size();
void *base;
base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (base == MAP_FAILED) {
p_err("event mmap failed: %s\n", strerror(errno));
return NULL;
}
return base;
}
static void perf_event_unmap(void *mem)
{
if (munmap(mem, perf_mmap_size()))
fprintf(stderr, "Can't unmap ring memory!\n");
}
static int bpf_perf_event_open(int map_fd, int key, int cpu)
{
struct perf_event_attr attr = {
.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_TIME,
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_BPF_OUTPUT,
};
int pmu_fd;
pmu_fd = sys_perf_event_open(&attr, -1, cpu, -1, 0);
if (pmu_fd < 0) {
p_err("failed to open perf event %d for CPU %d", key, cpu);
return -1;
}
if (bpf_map_update_elem(map_fd, &key, &pmu_fd, BPF_ANY)) {
p_err("failed to update map for event %d for CPU %d", key, cpu);
goto err_close;
}
if (ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) {
p_err("failed to enable event %d for CPU %d", key, cpu);
goto err_close;
}
return pmu_fd;
err_close:
close(pmu_fd);
return -1;
}
int do_event_pipe(int argc, char **argv)
{
int i, nfds, map_fd, index = -1, cpu = -1;
struct bpf_map_info map_info = {};
struct event_ring_info *rings;
size_t tmp_buf_sz = 0;
void *tmp_buf = NULL;
struct pollfd *pfds;
__u32 map_info_len;
bool do_all = true;
map_info_len = sizeof(map_info);
map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len);
if (map_fd < 0)
return -1;
if (map_info.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
p_err("map is not a perf event array");
goto err_close_map;
}
while (argc) {
if (argc < 2) {
BAD_ARG();
goto err_close_map;
}
if (is_prefix(*argv, "cpu")) {
char *endptr;
NEXT_ARG();
cpu = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as CPU ID", *argv);
goto err_close_map;
}
NEXT_ARG();
} else if (is_prefix(*argv, "index")) {
char *endptr;
NEXT_ARG();
index = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as index", *argv);
goto err_close_map;
}
NEXT_ARG();
} else {
BAD_ARG();
goto err_close_map;
}
do_all = false;
}
if (!do_all) {
if (index == -1 || cpu == -1) {
p_err("cpu and index must be specified together");
goto err_close_map;
}
nfds = 1;
} else {
nfds = min(get_possible_cpus(), map_info.max_entries);
cpu = 0;
index = 0;
}
rings = calloc(nfds, sizeof(rings[0]));
if (!rings)
goto err_close_map;
pfds = calloc(nfds, sizeof(pfds[0]));
if (!pfds)
goto err_free_rings;
for (i = 0; i < nfds; i++) {
rings[i].cpu = cpu + i;
rings[i].key = index + i;
rings[i].fd = bpf_perf_event_open(map_fd, rings[i].key,
rings[i].cpu);
if (rings[i].fd < 0)
goto err_close_fds_prev;
rings[i].mem = perf_event_mmap(rings[i].fd);
if (!rings[i].mem)
goto err_close_fds_current;
pfds[i].fd = rings[i].fd;
pfds[i].events = POLLIN;
}
signal(SIGINT, int_exit);
signal(SIGHUP, int_exit);
signal(SIGTERM, int_exit);
if (json_output)
jsonw_start_array(json_wtr);
while (!stop) {
poll(pfds, nfds, 200);
for (i = 0; i < nfds; i++)
perf_event_read(&rings[i], &tmp_buf, &tmp_buf_sz);
}
free(tmp_buf);
if (json_output)
jsonw_end_array(json_wtr);
for (i = 0; i < nfds; i++) {
perf_event_unmap(rings[i].mem);
close(rings[i].fd);
}
free(pfds);
free(rings);
close(map_fd);
return 0;
err_close_fds_prev:
while (i--) {
perf_event_unmap(rings[i].mem);
err_close_fds_current:
close(rings[i].fd);
}
free(pfds);
err_free_rings:
free(rings);
err_close_map:
close(map_fd);
return -1;
}