Jakub Kicinski | 907b223 | 2018-12-12 19:59:26 -0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 2 | /* Copyright (C) 2018 Netronome Systems, Inc. */ |
| 3 | /* This program is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of version 2 of the GNU General Public |
| 5 | * License as published by the Free Software Foundation. |
| 6 | */ |
| 7 | #include <errno.h> |
| 8 | #include <fcntl.h> |
Toke Høiland-Jørgensen | 229c3b4 | 2020-01-20 14:06:46 +0100 | [diff] [blame] | 9 | #include <bpf/libbpf.h> |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 10 | #include <poll.h> |
| 11 | #include <signal.h> |
| 12 | #include <stdbool.h> |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <string.h> |
| 16 | #include <time.h> |
| 17 | #include <unistd.h> |
| 18 | #include <linux/bpf.h> |
| 19 | #include <linux/perf_event.h> |
| 20 | #include <sys/ioctl.h> |
| 21 | #include <sys/mman.h> |
| 22 | #include <sys/syscall.h> |
| 23 | |
Toke Høiland-Jørgensen | 229c3b4 | 2020-01-20 14:06:46 +0100 | [diff] [blame] | 24 | #include <bpf/bpf.h> |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 25 | #include <perf-sys.h> |
| 26 | |
| 27 | #include "main.h" |
| 28 | |
| 29 | #define MMAP_PAGE_CNT 16 |
| 30 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 31 | static volatile bool stop; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 32 | |
| 33 | struct event_ring_info { |
| 34 | int fd; |
| 35 | int key; |
| 36 | unsigned int cpu; |
| 37 | void *mem; |
| 38 | }; |
| 39 | |
| 40 | struct perf_event_sample { |
| 41 | struct perf_event_header header; |
Quentin Monnet | 6e7e034 | 2020-05-11 17:15:33 +0100 | [diff] [blame] | 42 | __u64 time; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 43 | __u32 size; |
| 44 | unsigned char data[]; |
| 45 | }; |
| 46 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 47 | struct perf_event_lost { |
| 48 | struct perf_event_header header; |
| 49 | __u64 id; |
| 50 | __u64 lost; |
| 51 | }; |
| 52 | |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 53 | static void int_exit(int signo) |
| 54 | { |
| 55 | fprintf(stderr, "Stopping...\n"); |
| 56 | stop = true; |
| 57 | } |
| 58 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 59 | struct event_pipe_ctx { |
| 60 | bool all_cpus; |
| 61 | int cpu; |
| 62 | int idx; |
| 63 | }; |
| 64 | |
Daniel Borkmann | 3dca211 | 2018-10-21 02:09:28 +0200 | [diff] [blame] | 65 | static enum bpf_perf_event_ret |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 66 | print_bpf_output(void *private_data, int cpu, struct perf_event_header *event) |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 67 | { |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 68 | struct perf_event_sample *e = container_of(event, |
| 69 | struct perf_event_sample, |
Daniel Borkmann | 3dca211 | 2018-10-21 02:09:28 +0200 | [diff] [blame] | 70 | header); |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 71 | struct perf_event_lost *lost = container_of(event, |
| 72 | struct perf_event_lost, |
| 73 | header); |
| 74 | struct event_pipe_ctx *ctx = private_data; |
| 75 | int idx = ctx->all_cpus ? cpu : ctx->idx; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 76 | |
| 77 | if (json_output) { |
| 78 | jsonw_start_object(json_wtr); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 79 | jsonw_name(json_wtr, "type"); |
| 80 | jsonw_uint(json_wtr, e->header.type); |
| 81 | jsonw_name(json_wtr, "cpu"); |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 82 | jsonw_uint(json_wtr, cpu); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 83 | jsonw_name(json_wtr, "index"); |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 84 | jsonw_uint(json_wtr, idx); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 85 | if (e->header.type == PERF_RECORD_SAMPLE) { |
Jakub Kicinski | e368751 | 2018-05-10 10:24:37 -0700 | [diff] [blame] | 86 | jsonw_name(json_wtr, "timestamp"); |
| 87 | jsonw_uint(json_wtr, e->time); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 88 | jsonw_name(json_wtr, "data"); |
| 89 | print_data_json(e->data, e->size); |
| 90 | } else if (e->header.type == PERF_RECORD_LOST) { |
| 91 | jsonw_name(json_wtr, "lost"); |
| 92 | jsonw_start_object(json_wtr); |
| 93 | jsonw_name(json_wtr, "id"); |
| 94 | jsonw_uint(json_wtr, lost->id); |
| 95 | jsonw_name(json_wtr, "count"); |
| 96 | jsonw_uint(json_wtr, lost->lost); |
| 97 | jsonw_end_object(json_wtr); |
| 98 | } |
| 99 | jsonw_end_object(json_wtr); |
| 100 | } else { |
| 101 | if (e->header.type == PERF_RECORD_SAMPLE) { |
Jakub Kicinski | e368751 | 2018-05-10 10:24:37 -0700 | [diff] [blame] | 102 | printf("== @%lld.%09lld CPU: %d index: %d =====\n", |
| 103 | e->time / 1000000000ULL, e->time % 1000000000ULL, |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 104 | cpu, idx); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 105 | fprint_hex(stdout, e->data, e->size, " "); |
| 106 | printf("\n"); |
| 107 | } else if (e->header.type == PERF_RECORD_LOST) { |
| 108 | printf("lost %lld events\n", lost->lost); |
| 109 | } else { |
| 110 | printf("unknown event type=%d size=%d\n", |
| 111 | e->header.type, e->header.size); |
| 112 | } |
| 113 | } |
Jakub Kicinski | d0cabbb | 2018-05-10 10:24:40 -0700 | [diff] [blame] | 114 | |
| 115 | return LIBBPF_PERF_EVENT_CONT; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 118 | int do_event_pipe(int argc, char **argv) |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 119 | { |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 120 | struct perf_event_attr perf_attr = { |
Jakub Kicinski | e368751 | 2018-05-10 10:24:37 -0700 | [diff] [blame] | 121 | .sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_TIME, |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 122 | .type = PERF_TYPE_SOFTWARE, |
| 123 | .config = PERF_COUNT_SW_BPF_OUTPUT, |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 124 | .sample_period = 1, |
| 125 | .wakeup_events = 1, |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 126 | }; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 127 | struct bpf_map_info map_info = {}; |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 128 | struct perf_buffer_raw_opts opts = {}; |
| 129 | struct event_pipe_ctx ctx = { |
| 130 | .all_cpus = true, |
| 131 | .cpu = -1, |
| 132 | .idx = -1, |
| 133 | }; |
| 134 | struct perf_buffer *pb; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 135 | __u32 map_info_len; |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 136 | int err, map_fd; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 137 | |
| 138 | map_info_len = sizeof(map_info); |
| 139 | map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len); |
| 140 | if (map_fd < 0) |
| 141 | return -1; |
| 142 | |
| 143 | if (map_info.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) { |
| 144 | p_err("map is not a perf event array"); |
| 145 | goto err_close_map; |
| 146 | } |
| 147 | |
| 148 | while (argc) { |
Quentin Monnet | 785e76d | 2018-08-23 17:46:25 +0100 | [diff] [blame] | 149 | if (argc < 2) { |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 150 | BAD_ARG(); |
Quentin Monnet | 785e76d | 2018-08-23 17:46:25 +0100 | [diff] [blame] | 151 | goto err_close_map; |
| 152 | } |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 153 | |
| 154 | if (is_prefix(*argv, "cpu")) { |
| 155 | char *endptr; |
| 156 | |
| 157 | NEXT_ARG(); |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 158 | ctx.cpu = strtoul(*argv, &endptr, 0); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 159 | if (*endptr) { |
Quentin Monnet | 9def249 | 2019-08-15 15:32:15 +0100 | [diff] [blame] | 160 | p_err("can't parse %s as CPU ID", *argv); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 161 | goto err_close_map; |
| 162 | } |
| 163 | |
| 164 | NEXT_ARG(); |
| 165 | } else if (is_prefix(*argv, "index")) { |
| 166 | char *endptr; |
| 167 | |
| 168 | NEXT_ARG(); |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 169 | ctx.idx = strtoul(*argv, &endptr, 0); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 170 | if (*endptr) { |
Quentin Monnet | 9def249 | 2019-08-15 15:32:15 +0100 | [diff] [blame] | 171 | p_err("can't parse %s as index", *argv); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 172 | goto err_close_map; |
| 173 | } |
| 174 | |
| 175 | NEXT_ARG(); |
| 176 | } else { |
| 177 | BAD_ARG(); |
Quentin Monnet | 785e76d | 2018-08-23 17:46:25 +0100 | [diff] [blame] | 178 | goto err_close_map; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 181 | ctx.all_cpus = false; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 184 | if (!ctx.all_cpus) { |
| 185 | if (ctx.idx == -1 || ctx.cpu == -1) { |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 186 | p_err("cpu and index must be specified together"); |
| 187 | goto err_close_map; |
| 188 | } |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 189 | } else { |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 190 | ctx.cpu = 0; |
| 191 | ctx.idx = 0; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 194 | opts.attr = &perf_attr; |
| 195 | opts.event_cb = print_bpf_output; |
| 196 | opts.ctx = &ctx; |
| 197 | opts.cpu_cnt = ctx.all_cpus ? 0 : 1; |
| 198 | opts.cpus = &ctx.cpu; |
| 199 | opts.map_keys = &ctx.idx; |
| 200 | |
| 201 | pb = perf_buffer__new_raw(map_fd, MMAP_PAGE_CNT, &opts); |
| 202 | err = libbpf_get_error(pb); |
| 203 | if (err) { |
| 204 | p_err("failed to create perf buffer: %s (%d)", |
| 205 | strerror(err), err); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 206 | goto err_close_map; |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | signal(SIGINT, int_exit); |
| 210 | signal(SIGHUP, int_exit); |
| 211 | signal(SIGTERM, int_exit); |
| 212 | |
| 213 | if (json_output) |
| 214 | jsonw_start_array(json_wtr); |
| 215 | |
| 216 | while (!stop) { |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 217 | err = perf_buffer__poll(pb, 200); |
| 218 | if (err < 0 && err != -EINTR) { |
| 219 | p_err("perf buffer polling failed: %s (%d)", |
| 220 | strerror(err), err); |
| 221 | goto err_close_pb; |
| 222 | } |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 223 | } |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 224 | |
| 225 | if (json_output) |
| 226 | jsonw_end_array(json_wtr); |
| 227 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 228 | perf_buffer__free(pb); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 229 | close(map_fd); |
| 230 | |
| 231 | return 0; |
| 232 | |
Andrii Nakryiko | 9b190f1 | 2019-07-06 11:06:27 -0700 | [diff] [blame] | 233 | err_close_pb: |
| 234 | perf_buffer__free(pb); |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 235 | err_close_map: |
| 236 | close(map_fd); |
| 237 | return -1; |
| 238 | } |