linux-kernel - [PATCH V8 4/6] arm64/perf: Add branch stack support in struct pmu_hw

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Message-Id: <20230123125956.1350336-5-anshuman.khandual@arm.com>
Date:   Mon, 23 Jan 2023 18:29:54 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        will@...nel.org, catalin.marinas@....com, mark.rutland@....com
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        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 V8 4/6] 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 78cb1c895ab9..bd6dc6d0bd44 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