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perf/arm-cmn: Validate cycles events fully

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DTC cycle count events don't have anything to validate or initialise in
themselves, but we should not forget to still validate their whole group
context. Otherwise, we may fail to correctly reject a contrived group
containing an impossible number of cycles events.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/3124e8c276a1f513c1a415dc839ca4181b3c8bc8.1680522545.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2023-04-03 12:49:05 +01:00 committed by Will Deacon
parent 4248d043e4
commit 23b2fd8394
1 changed files with 1 additions and 1 deletions
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2
drivers/perf/arm-cmn.c
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@ -1546,7 +1546,7 @@ static int arm_cmn_event_init(struct perf_event *event)
type = CMN_EVENT_TYPE(event);
/* DTC events (i.e. cycles) already have everything they need */
if (type == CMN_TYPE_DTC)
return 0;
return arm_cmn_validate_group(cmn, event);
eventid = CMN_EVENT_EVENTID(event);
/* For watchpoints we need the actual XP node here */