linux-kernel - [PATCH 5.19 146/207] perf stat: Fix cpu map index in bperf cgroup code

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Date:   Mon, 26 Sep 2022 12:12:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>, bpf@...r.kernel.org,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 146/207] perf stat: Fix cpu map index in bperf cgroup code

From: Namhyung Kim <namhyung@...nel.org>

[ Upstream commit 3da35231d9e4949c4ae40e3ce653e7c468455d55 ]

The previous cpu map introduced a bug in the bperf cgroup counter.  This
results in a failure when user gives a partial cpu map starting from
non-zero.

  $ sudo ./perf stat -C 1-2 --bpf-counters --for-each-cgroup ^. sleep 1
  libbpf: prog 'on_cgrp_switch': failed to create BPF link for perf_event FD 0:
                                 -9 (Bad file descriptor)
  Failed to attach cgroup program

To get the FD of an evsel, it should use a map index not the CPU number.

Fixes: 0255571a16059c8e ("perf cpumap: Switch to using perf_cpu_map API")
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: bpf@...r.kernel.org
Cc: Ian Rogers <irogers@...gle.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Song Liu <songliubraving@...com>
Link: https://lore.kernel.org/r/20220916184132.1161506-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/bpf_counter_cgroup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/bpf_counter_cgroup.c b/tools/perf/util/bpf_counter_cgroup.c
index 63b9db657442..97c69a249c6e 100644
--- a/tools/perf/util/bpf_counter_cgroup.c
+++ b/tools/perf/util/bpf_counter_cgroup.c
@@ -95,7 +95,7 @@ static int bperf_load_program(struct evlist *evlist)
 
 	perf_cpu_map__for_each_cpu(cpu, i, evlist->core.all_cpus) {
 		link = bpf_program__attach_perf_event(skel->progs.on_cgrp_switch,
-						      FD(cgrp_switch, cpu.cpu));
+						      FD(cgrp_switch, i));
 		if (IS_ERR(link)) {
 			pr_err("Failed to attach cgroup program\n");
 			err = PTR_ERR(link);
@@ -123,7 +123,7 @@ static int bperf_load_program(struct evlist *evlist)
 
 			map_fd = bpf_map__fd(skel->maps.events);
 			perf_cpu_map__for_each_cpu(cpu, j, evlist->core.all_cpus) {
-				int fd = FD(evsel, cpu.cpu);
+				int fd = FD(evsel, j);
 				__u32 idx = evsel->core.idx * total_cpus + cpu.cpu;
 
 				err = bpf_map_update_elem(map_fd, &idx, &fd,
-- 
2.35.1