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    Subject[PATCH v5 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation
    Date
    This patch adds processing of PERF_BPF_EVENT_PROG_LOAD, which sets proper
    DSO type/id/etc of memory regions mapped to BPF programs to
    DSO_BINARY_TYPE__BPF_PROG_INFO

    Signed-off-by: Song Liu <songliubraving@fb.com>
    ---
    tools/perf/util/bpf-event.c | 53 +++++++++++++++++++++++++++++++++++++
    1 file changed, 53 insertions(+)

    diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
    index 370b830f2433..048ef00371ad 100644
    --- a/tools/perf/util/bpf-event.c
    +++ b/tools/perf/util/bpf-event.c
    @@ -25,12 +25,65 @@ static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
    return ret;
    }

    +static int machine__process_bpf_event_load(struct machine *machine __maybe_unused,
    + union perf_event *event,
    + struct perf_sample *sample __maybe_unused)
    +{
    + struct bpf_prog_info_linear *info_linear;
    + struct bpf_prog_info_node *info_node;
    + struct perf_env *env = machine->env;
    + int id = event->bpf_event.id;
    + unsigned int i;
    +
    + /* perf-record, no need to handle bpf-event */
    + if (env == NULL)
    + return 0;
    +
    + info_node = perf_env__find_bpf_prog_info(env, id);
    + if (!info_node)
    + return 0;
    + info_linear = info_node->info_linear;
    +
    + for (i = 0; i < info_linear->info.nr_jited_ksyms; i++) {
    + u64 *addrs = (u64 *)(info_linear->info.jited_ksyms);
    + u64 addr = addrs[i];
    + struct map *map;
    +
    + map = map_groups__find(&machine->kmaps, addr);
    +
    + if (map) {
    + map->dso->binary_type = DSO_BINARY_TYPE__BPF_PROG_INFO;
    + map->dso->bpf_prog.id = id;
    + map->dso->bpf_prog.sub_id = i;
    + map->dso->bpf_prog.env = env;
    + }
    + }
    + return 0;
    +}
    +
    int machine__process_bpf_event(struct machine *machine __maybe_unused,
    union perf_event *event,
    struct perf_sample *sample __maybe_unused)
    {
    if (dump_trace)
    perf_event__fprintf_bpf_event(event, stdout);
    +
    + switch (event->bpf_event.type) {
    + case PERF_BPF_EVENT_PROG_LOAD:
    + return machine__process_bpf_event_load(machine, event, sample);
    +
    + case PERF_BPF_EVENT_PROG_UNLOAD:
    + /*
    + * Do not free bpf_prog_info and btf of the program here,
    + * as annotation still need them. They will be freed at
    + * the end of the session.
    + */
    + break;
    + default:
    + pr_debug("unexpected bpf_event type of %d\n",
    + event->bpf_event.type);
    + break;
    + }
    return 0;
    }

    --
    2.17.1
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