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Subject[PATCH V4 3/7] arm64/perf: Update struct pmu_hw_events for BRBE
Date
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>
---
drivers/perf/arm_pmu.c | 1 +
include/linux/perf/arm_pmu.h | 27 +++++++++++++++++++++++++++
2 files changed, 28 insertions(+)

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 3f07df5a7e95..5048a500441e 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -905,6 +905,7 @@ static struct arm_pmu *__armpmu_alloc(gfp_t flags)

events = per_cpu_ptr(pmu->hw_events, cpu);
raw_spin_lock_init(&events->pmu_lock);
+ events->branches = kmalloc(sizeof(struct brbe_records), flags);
events->percpu_pmu = pmu;
}

diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 67a6d59786f2..bda0d9984a98 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -44,6 +44,16 @@ static_assert((PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_47BIT) == ARMPMU_EVT_47BIT);
}, \
}

+/*
+ * Maximum branch records in BRBE
+ */
+#define BRBE_MAX_ENTRIES 64
+
+struct brbe_records {
+ struct perf_branch_stack brbe_stack;
+ struct perf_branch_entry brbe_entries[BRBE_MAX_ENTRIES];
+};
+
/* The events for a given PMU register set. */
struct pmu_hw_events {
/*
@@ -70,6 +80,23 @@ struct pmu_hw_events {
struct arm_pmu *percpu_pmu;

int irq;
+
+ /* Detected BRBE attributes */
+ bool brbe_v1p1;
+ int brbe_cc;
+ int brbe_nr;
+ int brbe_format;
+
+ /* 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 brbe_records *branches;
};

enum armpmu_attr_groups {
--
2.25.1
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