From 0f9e0d7928d8e88d57b1482effab70edb9741ce1 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung@kernel.org>
Date: Thu, 30 Nov 2023 11:52:46 +0530
Subject: [PATCH] perf/x86/amd: Reject branch stack for IBS events

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

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231130062246.290-1-ravi.bangoria@amd.com
---
 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;