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s390/cpum_cf: Deny all sampling events by counter PMU

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[ Upstream commit ce971233242b5391d99442271f3ca096fb49818d ]

Deny all sampling event by the CPUMF counter facility device driver
and return -ENOENT. This return value is used to try other PMUs.
Up to now events for type PERF_TYPE_HARDWARE were not tested for
sampling and returned later on -EOPNOTSUPP. This ends the search
for alternative PMUs. Change that behavior and try other PMUs
instead.

Fixes: 613a41b0d1 ("s390/cpum_cf: Reject request for sampling in event initialization")
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Richter
2025-08-22 14:05:57 +02:00
committed by Greg Kroah-Hartman
parent 1262bda871
commit d660c8d814
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kernel/perf_cpum_cf.c
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@@ -757,8 +757,6 @@ static int __hw_perf_event_init(struct perf_event *event, unsigned int type)
break;
case PERF_TYPE_HARDWARE:
if (is_sampling_event(event)) /* No sampling support */
return -ENOENT;
ev = attr->config;
if (!attr->exclude_user && attr->exclude_kernel) {
/*
@@ -856,6 +854,8 @@ static int cpumf_pmu_event_init(struct perf_event *event)
unsigned int type = event->attr.type;
int err;
if (is_sampling_event(event)) /* No sampling support */
return err;
if (type == PERF_TYPE_HARDWARE || type == PERF_TYPE_RAW)
err = __hw_perf_event_init(event, type);
else if (event->pmu->type == type)