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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* 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 <bpf/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/bpf.h>
#include "main.h"
#define MMAP_PAGE_CNT 16
static volatile bool stop;
struct perf_event_sample {
struct perf_event_header header;
__u64 time;
__u32 size;
unsigned char data[];
};
struct perf_event_lost {
struct perf_event_header header;
__u64 id;
__u64 lost;
};
static void int_exit(int signo)
{
fprintf(stderr, "Stopping...\n");
stop = true;
}
struct event_pipe_ctx {
bool all_cpus;
int cpu;
int idx;
};
static enum bpf_perf_event_ret
print_bpf_output(void *private_data, int cpu, struct perf_event_header *event)
{
struct perf_event_sample *e = container_of(event,
struct perf_event_sample,
header);
struct perf_event_lost *lost = container_of(event,
struct perf_event_lost,
header);
struct event_pipe_ctx *ctx = private_data;
int idx = ctx->all_cpus ? cpu : ctx->idx;
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, cpu);
jsonw_name(json_wtr, "index");
jsonw_uint(json_wtr, idx);
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,
cpu, idx);
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;
}
int do_event_pipe(int argc, char **argv)
{
struct perf_event_attr perf_attr = {
.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_TIME,
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_BPF_OUTPUT,
.sample_period = 1,
.wakeup_events = 1,
};
struct bpf_map_info map_info = {};
LIBBPF_OPTS(perf_buffer_raw_opts, opts);
struct event_pipe_ctx ctx = {
.all_cpus = true,
.cpu = -1,
.idx = -1,
};
struct perf_buffer *pb;
__u32 map_info_len;
int err, map_fd;
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();
ctx.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();
ctx.idx = 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;
}
ctx.all_cpus = false;
}
if (!ctx.all_cpus) {
if (ctx.idx == -1 || ctx.cpu == -1) {
p_err("cpu and index must be specified together");
goto err_close_map;
}
} else {
ctx.cpu = 0;
ctx.idx = 0;
}
opts.cpu_cnt = ctx.all_cpus ? 0 : 1;
opts.cpus = &ctx.cpu;
opts.map_keys = &ctx.idx;
pb = perf_buffer__new_raw(map_fd, MMAP_PAGE_CNT, &perf_attr,
print_bpf_output, &ctx, &opts);
if (!pb) {
p_err("failed to create perf buffer: %s (%d)",
strerror(errno), errno);
goto err_close_map;
}
signal(SIGINT, int_exit);
signal(SIGHUP, int_exit);
signal(SIGTERM, int_exit);
if (json_output)
jsonw_start_array(json_wtr);
while (!stop) {
err = perf_buffer__poll(pb, 200);
if (err < 0 && err != -EINTR) {
p_err("perf buffer polling failed: %s (%d)",
strerror(errno), errno);
goto err_close_pb;
}
}
if (json_output)
jsonw_end_array(json_wtr);
perf_buffer__free(pb);
close(map_fd);
return 0;
err_close_pb:
perf_buffer__free(pb);
err_close_map:
close(map_fd);
return -1;
}
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