linux-kernel - [PATCH] perf evsel amd: Fix IBS error message

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Message-ID: <20230621062359.201-1-ravi.bangoria@amd.com>
Date:   Wed, 21 Jun 2023 11:53:59 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     <acme@...nel.org>
CC:     <ravi.bangoria@....com>, <peterz@...radead.org>,
        <irogers@...gle.com>, <jolsa@...nel.org>, <namhyung@...nel.org>,
        <adrian.hunter@...el.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sandipan.das@....com>,
        <ananth.narayan@....com>, <santosh.shukla@....com>
Subject: [PATCH] perf evsel amd: Fix IBS error message

AMD IBS can do per-process profiling[1] and is no longer restricted to
per-cpu or systemwide only. Remove stale error message.

Before:
  $ sudo ./perf record -e "{ibs_op//,ibs_op//}" -C 0
  Error:
  AMD IBS may only be available in system-wide/per-cpu mode.
  Try using -a, or -C and workload affinity

After:
  $ sudo ./perf record -e "{ibs_op//,ibs_op//}" -C 0
  Error:
  The sys_perf_event_open() syscall returned with 22 (Invalid
  argument) for event (ibs_op//).
  /bin/dmesg | grep -i perf may provide additional information.

[1] https://git.kernel.org/torvalds/c/30093056f7b2

Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
---
 tools/perf/util/evsel.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 356c07f03be6..65b0b70830f0 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -3092,14 +3092,10 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
 			return scnprintf(msg, size,
 	"Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
 					evsel__name(evsel));
-		if (is_amd(arch, cpuid)) {
-			if (is_amd_ibs(evsel)) {
-				if (evsel->core.attr.exclude_kernel)
-					return scnprintf(msg, size,
+		if (is_amd(arch, cpuid) && is_amd_ibs(evsel)) {
+			if (evsel->core.attr.exclude_kernel) {
+				return scnprintf(msg, size,
 	"AMD IBS can't exclude kernel events.  Try running at a higher privilege level.");
-				if (!evsel->core.system_wide)
-					return scnprintf(msg, size,
-	"AMD IBS may only be available in system-wide/per-cpu mode.  Try using -a, or -C and workload affinity");
 			}
 		}
 
-- 
2.41.0