linux-kernel - [PATCH v7 09/11] arm: pmu: Move error message and -EOPNOTSUPP to individual PMUs

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Date:   Mon, 11 Dec 2023 16:13:21 +0000
From:   James Clark <james.clark@....com>
To:     linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, suzuki.poulose@....com,
        will@...nel.org, mark.rutland@....com, anshuman.khandual@....com
Cc:     namhyung@...il.com, James Clark <james.clark@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jonathan Corbet <corbet@....net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Zaid Al-Bassam <zalbassam@...gle.com>,
        Raghavendra Rao Ananta <rananta@...gle.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH v7 09/11] arm: pmu: Move error message and -EOPNOTSUPP to individual PMUs

-EPERM or -EINVAL always get converted to -EOPNOTSUPP, so replace them.
This will allow __hw_perf_event_init() to return a different code or not
print that particular message for a different error in the next commit.

Signed-off-by: James Clark <james.clark@....com>
---
 arch/arm/kernel/perf_event_v7.c |  6 ++++--
 drivers/perf/apple_m1_cpu_pmu.c |  6 ++++--
 drivers/perf/arm_pmu.c          | 11 +++++------
 drivers/perf/arm_pmuv3.c        |  6 ++++--
 4 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index eb2190477da1..4e115076d323 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -1072,8 +1072,10 @@ static int armv7pmu_set_event_filter(struct hw_perf_event *event,
 {
 	unsigned long config_base = 0;
 
-	if (attr->exclude_idle)
-		return -EPERM;
+	if (attr->exclude_idle) {
+		pr_debug("ARM performance counters do not support mode exclusion\n");
+		return -EOPNOTSUPP;
+	}
 	if (attr->exclude_user)
 		config_base |= ARMV7_EXCLUDE_USER;
 	if (attr->exclude_kernel)
diff --git a/drivers/perf/apple_m1_cpu_pmu.c b/drivers/perf/apple_m1_cpu_pmu.c
index cd2de44b61b9..f322e5ca1114 100644
--- a/drivers/perf/apple_m1_cpu_pmu.c
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -524,8 +524,10 @@ static int m1_pmu_set_event_filter(struct hw_perf_event *event,
 {
 	unsigned long config_base = 0;
 
-	if (!attr->exclude_guest)
-		return -EINVAL;
+	if (!attr->exclude_guest) {
+		pr_debug("ARM performance counters do not support mode exclusion\n");
+		return -EOPNOTSUPP;
+	}
 	if (!attr->exclude_kernel)
 		config_base |= M1_PMU_CFG_COUNT_KERNEL;
 	if (!attr->exclude_user)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index d712a19e47ac..2ce65b440e85 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -445,7 +445,7 @@ __hw_perf_event_init(struct perf_event *event)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
 	struct hw_perf_event *hwc = &event->hw;
-	int mapping;
+	int mapping, ret;
 
 	hwc->flags = 0;
 	mapping = armpmu->map_event(event);
@@ -470,11 +470,10 @@ __hw_perf_event_init(struct perf_event *event)
 	/*
 	 * Check whether we need to exclude the counter from certain modes.
 	 */
-	if (armpmu->set_event_filter &&
-	    armpmu->set_event_filter(hwc, &event->attr)) {
-		pr_debug("ARM performance counters do not support "
-			 "mode exclusion\n");
-		return -EOPNOTSUPP;
+	if (armpmu->set_event_filter) {
+		ret = armpmu->set_event_filter(hwc, &event->attr);
+		if (ret)
+			return ret;
 	}
 
 	/*
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 84b15c0892d9..d33378a198cc 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -932,8 +932,10 @@ static int armv8pmu_set_event_filter(struct hw_perf_event *event,
 {
 	unsigned long config_base = 0;
 
-	if (attr->exclude_idle)
-		return -EPERM;
+	if (attr->exclude_idle) {
+		pr_debug("ARM performance counters do not support mode exclusion\n");
+		return -EOPNOTSUPP;
+	}
 
 	/*
 	 * If we're running in hyp mode, then we *are* the hypervisor.
-- 
2.34.1