linux-kernel - [PATCH v2] perf/x86/amd: Reject branch stack for IBS events

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Date:   Thu, 30 Nov 2023 11:52:46 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     <peterz@...radead.org>, <acme@...nel.org>
CC:     <ravi.bangoria@....com>, <mingo@...nel.org>, <jolsa@...nel.org>,
        <irogers@...gle.com>, <adrian.hunter@...el.com>,
        <eranian@...gle.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sandipan.das@....com>,
        <ananth.narayan@....com>, <santosh.shukla@....com>
Subject: [PATCH v2] perf/x86/amd: Reject branch stack for IBS events

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

The AMD IBS PMU doesn't handle branch stacks, so it should not accept
events with brstack.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
---
v1: https://lore.kernel.org/r/20230602194513.1589179-1-namhyung@kernel.org
v1->v2:
 - Rebase on top of peterz/queue/perf/core

 arch/x86/events/amd/ibs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 6911c5399d02..e91970b01d62 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -287,6 +287,9 @@ static int perf_ibs_init(struct perf_event *event)
 	if (config & ~perf_ibs->config_mask)
 		return -EINVAL;
 
+	if (has_branch_stack(event))
+		return -EOPNOTSUPP;
+
 	ret = validate_group(event);
 	if (ret)
 		return ret;
-- 
2.34.1