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perf bpf: Process PERF_BPF_EVENT_PROG_LOAD for annotation 

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>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stanislav Fomichev <sdf@google.com>
Cc: kernel-team@fb.com
Link: http://lkml.kernel.org/r/20190312053051.2690567-14-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Song Liu 2019-03-11 22:30:49 -07:00 committed by Arnaldo Carvalho de Melo
parent 9b86d04d53
commit 3ca3877a97
1 changed files with 54 additions and 0 deletions
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54
tools/perf/util/bpf-event.c
View File

@ -12,6 +12,7 @@
#include "machine.h"
#include "env.h"
#include "session.h"
#include "map.h"
#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
@ -25,12 +26,65 @@ 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,
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;
}