From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
linux-perf-users@vger.kernel.org
Subject: [RFC V1 05/11] arm64/perf: Detect support for BRBE
Date: Mon, 24 Jan 2022 10:00:47 +0530 [thread overview]
Message-ID: <1642998653-21377-6-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1642998653-21377-1-git-send-email-anshuman.khandual@arm.com>
CPU specific BRBE entries, cycle count, format support gets detected during
PMU init. This information gets saved in per-cpu struct pmu_hw_events which
later helps in operating BRBE during a perf event context.
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
drivers/perf/arm_pmu_platform.c | 34 +++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/perf/arm_pmu_platform.c b/drivers/perf/arm_pmu_platform.c
index 513de1f54e2d..800e4a6e8bc3 100644
--- a/drivers/perf/arm_pmu_platform.c
+++ b/drivers/perf/arm_pmu_platform.c
@@ -172,6 +172,36 @@ static int armpmu_request_irqs(struct arm_pmu *armpmu)
return err;
}
+static void arm_brbe_probe_cpu(void *info)
+{
+ struct pmu_hw_events *hw_events;
+ struct arm_pmu *armpmu = info;
+
+ /*
+ * Return from here, if BRBE driver has not been
+ * implemented for this PMU. This helps prevent
+ * kernel crash later when brbe_probe() will be
+ * called on the PMU.
+ */
+ if (!armpmu->brbe_probe)
+ return;
+
+ hw_events = per_cpu_ptr(armpmu->hw_events, smp_processor_id());
+ armpmu->brbe_probe(hw_events);
+}
+
+static int armpmu_request_brbe(struct arm_pmu *armpmu)
+{
+ int cpu, err = 0;
+
+ for_each_cpu(cpu, &armpmu->supported_cpus) {
+ err = smp_call_function_single(cpu, arm_brbe_probe_cpu, armpmu, 1);
+ if (err)
+ return err;
+ }
+ return err;
+}
+
static void armpmu_free_irqs(struct arm_pmu *armpmu)
{
int cpu;
@@ -229,6 +259,10 @@ int arm_pmu_device_probe(struct platform_device *pdev,
if (ret)
goto out_free_irqs;
+ ret = armpmu_request_brbe(pmu);
+ if (ret)
+ goto out_free_irqs;
+
ret = armpmu_register(pmu);
if (ret) {
dev_err(dev, "failed to register PMU devices!\n");
--
2.25.1
next prev parent reply other threads:[~2022-01-24 4:32 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 4:30 [RFC V1 00/11] arm64/perf: Enable branch stack sampling Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 01/11] perf: Consolidate branch sample filter helpers Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 02/11] arm64/perf: Add register definitions for BRBE Anshuman Khandual
2022-01-24 14:05 ` Marc Zyngier
2022-01-25 5:04 ` Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 03/11] arm64/perf: Update struct arm_pmu " Anshuman Khandual
2022-01-26 16:59 ` Rob Herring
2022-01-28 3:38 ` Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 04/11] arm64/perf: Update struct pmu_hw_events " Anshuman Khandual
2022-01-24 4:30 ` Anshuman Khandual [this message]
2022-01-26 17:18 ` [RFC V1 05/11] arm64/perf: Detect support " Rob Herring
2022-01-28 3:27 ` Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 06/11] arm64/perf: Drive BRBE from perf event states Anshuman Khandual
2022-01-26 17:07 ` Rob Herring
2022-01-27 12:20 ` Anshuman Khandual
2022-01-27 14:31 ` Rob Herring
2022-01-24 4:30 ` [RFC V1 07/11] arm64/perf: Add BRBE driver Anshuman Khandual
2022-01-24 18:11 ` James Clark
2022-01-24 18:15 ` James Clark
2022-01-24 4:30 ` [RFC V1 08/11] arm64/perf: Enable branch stack sampling Anshuman Khandual
2022-01-24 18:02 ` James Clark
2022-01-24 4:30 ` [RFC V1 09/11] perf: Add more generic branch types Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 10/11] perf: Expand perf_branch_entry.type Anshuman Khandual
2022-01-25 16:58 ` James Clark
2022-01-28 4:14 ` Anshuman Khandual
2022-01-26 16:47 ` Rob Herring
2022-01-27 10:41 ` Anshuman Khandual
2022-01-24 4:30 ` [RFC V1 11/11] perf: Capture branch privilege information Anshuman Khandual
2022-01-25 15:39 ` James Clark
2022-02-02 11:11 ` Anshuman Khandual
2022-01-26 17:27 ` James Clark
2022-03-14 6:47 ` Anshuman Khandual
2022-01-25 16:25 ` [PATCH 0/1] perf test: Add branch stack sampling tests for ARM64 German Gomez
2022-01-25 16:25 ` [PATCH 1/1] " German Gomez
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