diff options
| author | Thomas Richter <tmricht@linux.ibm.com> | 2025-08-25 09:53:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-19 16:35:44 +0200 |
| commit | 5665ac5c5151ce73fe734d7818e34ef50708af7e (patch) | |
| tree | 35413bd37ce64ddebe2d27d7543242faec587850 | |
| parent | 88525accf16947ab459f8e91c27c8c53e1d612d7 (diff) | |
s390/pai: Deny all events not handled by this PMU
[ Upstream commit 85941afd2c404247e583c827fae0a45da1c1d92c ]
Each PAI PMU device driver returns -EINVAL when an event is out of
its accepted range. This return value aborts the search for an
alternative PMU device driver to handle this event.
Change the return value to -ENOENT. This return value is used to
try other PMUs instead. This makes the PMUs more robust when
the sequence of PMU device driver initialization changes (at boot time)
or by using modules.
Fixes: 39d62336f5c12 ("s390/pai: add support for cryptography counters")
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>
| -rw-r--r-- | arch/s390/kernel/perf_pai_crypto.c | 4 | ||||
| -rw-r--r-- | arch/s390/kernel/perf_pai_ext.c | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c index 10725f5a6f0f..11200880a96c 100644 --- a/arch/s390/kernel/perf_pai_crypto.c +++ b/arch/s390/kernel/perf_pai_crypto.c @@ -286,10 +286,10 @@ static int paicrypt_event_init(struct perf_event *event) /* PAI crypto PMU registered as PERF_TYPE_RAW, check event type */ if (a->type != PERF_TYPE_RAW && event->pmu->type != a->type) return -ENOENT; - /* PAI crypto event must be in valid range */ + /* PAI crypto event must be in valid range, try others if not */ if (a->config < PAI_CRYPTO_BASE || a->config > PAI_CRYPTO_BASE + paicrypt_cnt) - return -EINVAL; + return -ENOENT; /* Allow only CRYPTO_ALL for sampling */ if (a->sample_period && a->config != PAI_CRYPTO_BASE) return -EINVAL; diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c index a8f0bad99cf0..28398e313b58 100644 --- a/arch/s390/kernel/perf_pai_ext.c +++ b/arch/s390/kernel/perf_pai_ext.c @@ -266,7 +266,7 @@ static int paiext_event_valid(struct perf_event *event) event->hw.config_base = offsetof(struct paiext_cb, acc); return 0; } - return -EINVAL; + return -ENOENT; } /* Might be called on different CPU than the one the event is intended for. */ |