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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/bpf/bpftool/map_perf_ring.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/bpf/bpftool/map_perf_ring.c')
-rw-r--r-- | tools/bpf/bpftool/map_perf_ring.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/map_perf_ring.c b/tools/bpf/bpftool/map_perf_ring.c new file mode 100644 index 000000000..825f29f93 --- /dev/null +++ b/tools/bpf/bpftool/map_perf_ring.c @@ -0,0 +1,238 @@ +// 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 <perf-sys.h> + +#include "main.h" + +#define MMAP_PAGE_CNT 16 + +static volatile 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[]; +}; + +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 = {}; + struct 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.attr = &perf_attr; + opts.event_cb = print_bpf_output; + opts.ctx = &ctx; + 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, &opts); + err = libbpf_get_error(pb); + if (err) { + p_err("failed to create perf buffer: %s (%d)", + strerror(err), err); + 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(err), err); + 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; +} |