[PATCH V2 3/7] arm64/perf: Update struct pmu_hw_events for BRBE

Anshuman Khandual
2022-09-08T05:11:24Z

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