[PATCH V12 05/10] arm64/perf: Add branch stack support in ARMV8 PMU

[Anshuman Khandual]

This enables support for branch stack sampling event in ARMV8 PMU, checking
has_branch_stack() on the event inside 'struct arm_pmu' callbacks. Although
these branch stack helpers armv8pmu_branch_XXXXX() are just dummy functions
for now. While here, this also defines arm_pmu's sched_task() callback with
armv8pmu_sched_task(), which resets the branch record buffer on a sched_in.

Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Tested-by: James Clark <james.clark at arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
---
 arch/arm64/include/asm/perf_event.h | 31 +++++++++++
 drivers/perf/arm_pmuv3.c            | 86 +++++++++++++++++++++--------
 2 files changed, 93 insertions(+), 24 deletions(-)

diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
index eb7071c9eb34..ebc392ba3559 100644
--- a/arch/arm64/include/asm/perf_event.h
+++ b/arch/arm64/include/asm/perf_event.h
@@ -24,4 +24,35 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs);
 	(regs)->pstate = PSR_MODE_EL1h;	\
 }
 
+struct pmu_hw_events;
+struct arm_pmu;
+struct perf_event;
+
+#ifdef CONFIG_PERF_EVENTS
+static inline bool has_branch_stack(struct perf_event *event);
+
+static inline void armv8pmu_branch_read(struct pmu_hw_events *cpuc, struct perf_event *event)
+{
+	WARN_ON_ONCE(!has_branch_stack(event));
+}
+
+static inline bool armv8pmu_branch_attr_valid(struct perf_event *event)
+{
+	WARN_ON_ONCE(!has_branch_stack(event));
+	return false;
+}
+
+static inline void armv8pmu_branch_enable(struct perf_event *event)
+{
+	WARN_ON_ONCE(!has_branch_stack(event));
+}
+
+static inline void armv8pmu_branch_disable(struct perf_event *event)
+{
+	WARN_ON_ONCE(!has_branch_stack(event));
+}
+
+static inline void armv8pmu_branch_probe(struct arm_pmu *arm_pmu) { }
+static inline void armv8pmu_branch_reset(void) { }
+#endif
 #endif
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index c98e4039386d..54c80f393eb6 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -705,38 +705,21 @@ static void armv8pmu_enable_event(struct perf_event *event)
 	 * Enable counter and interrupt, and set the counter to count
 	 * the event that we're interested in.
 	 */
-
-	/*
-	 * Disable counter
-	 */
 	armv8pmu_disable_event_counter(event);
-
-	/*
-	 * Set event.
-	 */
 	armv8pmu_write_event_type(event);
-
-	/*
-	 * Enable interrupt for this counter
-	 */
 	armv8pmu_enable_event_irq(event);
-
-	/*
-	 * Enable counter
-	 */
 	armv8pmu_enable_event_counter(event);
+
+	if (has_branch_stack(event))
+		armv8pmu_branch_enable(event);
 }
 
 static void armv8pmu_disable_event(struct perf_event *event)
 {
-	/*
-	 * Disable counter
-	 */
-	armv8pmu_disable_event_counter(event);
+	if (has_branch_stack(event))
+		armv8pmu_branch_disable(event);
 
-	/*
-	 * Disable interrupt for this counter
-	 */
+	armv8pmu_disable_event_counter(event);
 	armv8pmu_disable_event_irq(event);
 }
 
@@ -814,6 +797,11 @@ static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu)
 		if (!armpmu_event_set_period(event))
 			continue;
 
+		if (has_branch_stack(event) && !WARN_ON(!cpuc->branches)) {
+			armv8pmu_branch_read(cpuc, event);
+			perf_sample_save_brstack(&data, event, &cpuc->branches->branch_stack);
+		}
+
 		/*
 		 * Perf event overflow will queue the processing of the event as
 		 * an irq_work which will be taken care of in the handling of
@@ -912,6 +900,14 @@ static int armv8pmu_user_event_idx(struct perf_event *event)
 	return event->hw.idx;
 }
 
+static void armv8pmu_sched_task(struct perf_event_pmu_context *pmu_ctx, bool sched_in)
+{
+	struct arm_pmu *armpmu = to_arm_pmu(pmu_ctx->pmu);
+
+	if (sched_in && armpmu->has_branch_stack)
+		armv8pmu_branch_reset();
+}
+
 /*
  * Add an event filter to a given event.
  */
@@ -982,6 +978,9 @@ static void armv8pmu_reset(void *info)
 		pmcr |= ARMV8_PMU_PMCR_LP;
 
 	armv8pmu_pmcr_write(pmcr);
+
+	if (cpu_pmu->has_branch_stack)
+		armv8pmu_branch_reset();
 }
 
 static int __armv8_pmuv3_map_event_id(struct arm_pmu *armpmu,
@@ -1019,6 +1018,9 @@ static int __armv8_pmuv3_map_event(struct perf_event *event,
 
 	hw_event_id = __armv8_pmuv3_map_event_id(armpmu, event);
 
+	if (has_branch_stack(event) && !armv8pmu_branch_attr_valid(event))
+		return -EOPNOTSUPP;
+
 	/*
 	 * CHAIN events only work when paired with an adjacent counter, and it
 	 * never makes sense for a user to open one in isolation, as they'll be
@@ -1135,6 +1137,33 @@ static void __armv8pmu_probe_pmu(void *info)
 		cpu_pmu->reg_pmmir = read_pmmir();
 	else
 		cpu_pmu->reg_pmmir = 0;
+	armv8pmu_branch_probe(cpu_pmu);
+}
+
+static int branch_records_alloc(struct arm_pmu *armpmu)
+{
+	struct branch_records __percpu *records;
+	int cpu;
+
+	records = alloc_percpu_gfp(struct branch_records, GFP_KERNEL);
+	if (!records)
+		return -ENOMEM;
+
+	/*
+	 * FIXME: Memory allocated via records gets completely
+	 * consumed here, never required to be freed up later. Hence
+	 * losing access to on stack 'records' is acceptable.
+	 * Otherwise this alloc handle has to be saved some where.
+	 */
+	for_each_possible_cpu(cpu) {
+		struct pmu_hw_events *events_cpu;
+		struct branch_records *records_cpu;
+
+		events_cpu = per_cpu_ptr(armpmu->hw_events, cpu);
+		records_cpu = per_cpu_ptr(records, cpu);
+		events_cpu->branches = records_cpu;
+	}
+	return 0;
 }
 
 static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu)
@@ -1151,7 +1180,15 @@ static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu)
 	if (ret)
 		return ret;
 
-	return probe.present ? 0 : -ENODEV;
+	if (!probe.present)
+		return -ENODEV;
+
+	if (cpu_pmu->has_branch_stack) {
+		ret = branch_records_alloc(cpu_pmu);
+		if (ret)
+			return ret;
+	}
+	return 0;
 }
 
 static void armv8pmu_disable_user_access_ipi(void *unused)
@@ -1214,6 +1251,7 @@ static int armv8_pmu_init(struct arm_pmu *cpu_pmu, char *name,
 	cpu_pmu->set_event_filter	= armv8pmu_set_event_filter;
 
 	cpu_pmu->pmu.event_idx		= armv8pmu_user_event_idx;
+	cpu_pmu->sched_task		= armv8pmu_sched_task;
 
 	cpu_pmu->name			= name;
 	cpu_pmu->map_event		= map_event;
-- 
2.25.1