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Message-Id: <20221208084402.863310-5-anshuman.khandual@arm.com>
Date: Thu, 8 Dec 2022 14:13:59 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
mark.rutland@....com
Cc: Anshuman Khandual <anshuman.khandual@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Mark Brown <broonie@...nel.org>,
James Clark <james.clark@....com>,
Rob Herring <robh@...nel.org>, Marc Zyngier <maz@...nel.org>,
Suzuki Poulose <suzuki.poulose@....com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
linux-perf-users@...r.kernel.org
Subject: [PATCH V6 4/7] arm64/perf: Add branch stack support in struct pmu_hw_events
This adds branch records buffer pointer in 'struct pmu_hw_events' which can
be used to capture branch records during PMU interrupt. This percpu pointer
here needs to be allocated first before usage.
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
include/linux/perf/arm_pmu.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 8c4f42189904..871289fe4774 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -44,6 +44,13 @@ static_assert((PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_47BIT) == ARMPMU_EVT_47BIT);
}, \
}
+#define MAX_BRANCH_RECORDS 64
+
+struct branch_records {
+ struct perf_branch_stack branch_stack;
+ struct perf_branch_entry branch_entries[MAX_BRANCH_RECORDS];
+};
+
/* The events for a given PMU register set. */
struct pmu_hw_events {
/*
@@ -70,6 +77,8 @@ struct pmu_hw_events {
struct arm_pmu *percpu_pmu;
int irq;
+
+ struct branch_records *branches;
};
enum armpmu_attr_groups {
--
2.25.1
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