[PATCH 5.17 0252/1126] perf/arm-cmn: Hide XP PUB events for CMN-600

Greg Kroah-Hartman
2022-04-05T08:08:33Z

From: Robin Murphy <robin.murphy@arm.com>

[ Upstream commit 205295c7e1abba9c1db1f9fe075f22f71351887f ]

CMN-600 doesn't have XP events for the PUB channel, but we missed
the appropriate check to avoid exposing them.

Fixes: 60d1504070c2 ("perf/arm-cmn: Support new IP features")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/4c108d39a0513def63acccf09ab52b328f242aeb.1645727871.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/perf/arm-cmn.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 0e48adce57ef..d45e8c17e1f8 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -595,6 +595,9 @@ static umode_t arm_cmn_event_attr_is_visible(struct kobject *kobj,
if ((intf & 4) && !(cmn->ports_used & BIT(intf & 3)))
return 0;

+ if (chan == 4 && cmn->model == CMN600)
+ return 0;
+
if ((chan == 5 && cmn->rsp_vc_num < 2) ||
(chan == 6 && cmn->dat_vc_num < 2))
return 0;
--
2.34.1