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From:   Anshuman Khandual <anshuman.khandual@arm.com>
To:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        peterz@infradead.org, acme@kernel.org, mark.rutland@arm.com,
        will@kernel.org
Cc:     Anshuman Khandual <anshuman.khandual@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        James Clark <james.clark@arm.com>,
        Rob Herring <robh@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        linux-perf-users@vger.kernel.org
Subject: [PATCH 4/8] arm64/perf: Update struct pmu_hw_events for BRBE
Date:   Mon, 13 Jun 2022 15:31:15 +0530
Message-Id: <20220613100119.684673-5-anshuman.khandual@arm.com>
In-Reply-To: <20220613100119.684673-1-anshuman.khandual@arm.com>
References: <20220613100119.684673-1-anshuman.khandual@arm.com>
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A single perf event instance BRBE related contexts and data will be tracked
in struct pmu_hw_events. Hence update the structure to accommodate required
details related to BRBE.

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>
---
 include/linux/perf/arm_pmu.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 3d427ac0ca45..18e519e4e658 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -43,6 +43,11 @@
 	},								\
 }
 
+/*
+ * Maximum branch records in BRBE
+ */
+#define BRBE_MAX_ENTRIES 64
+
 /* The events for a given PMU register set. */
 struct pmu_hw_events {
 	/*
@@ -69,6 +74,23 @@ struct pmu_hw_events {
 	struct arm_pmu		*percpu_pmu;
 
 	int irq;
+
+	/* Detected BRBE attributes */
+	bool				v1p1;
+	int				brbe_cc;
+	int				brbe_nr;
+
+	/* Evaluated BRBE configuration */
+	u64				brbfcr;
+	u64				brbcr;
+
+	/* Tracked BRBE context */
+	unsigned int			brbe_users;
+	void				*brbe_context;
+
+	/* Captured BRBE buffer - copied as is into perf_sample_data */
+	struct perf_branch_stack	brbe_stack;
+	struct perf_branch_entry	brbe_entries[BRBE_MAX_ENTRIES];
 };
 
 enum armpmu_attr_groups {
-- 
2.25.1