[RFC V2 8/8] arm64/perf: Enable branch stack sampling

[Anshuman Khandual <anshuman.khandual@arm.com>]

Now that all the required pieces are already in place, just enable the perf
branch stack sampling support on arm64 platform, by removing the gate which
blocks it in armpmu_event_init().

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 drivers/perf/arm_pmu.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index ab187a3bcdab..8b08811f662a 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -539,9 +539,35 @@ static int armpmu_event_init(struct perf_event *event)
 		!cpumask_test_cpu(event->cpu, &armpmu->supported_cpus))
 		return -ENOENT;
 
-	/* does not support taken branch sampling */
-	if (has_branch_stack(event))
-		return -EOPNOTSUPP;
+	if (has_branch_stack(event)) {
+		/*
+		 * BRBE support is absent. Select CONFIG_ARM_BRBE_PMU
+		 * in the config, before branch stack sampling events
+		 * can be requested.
+		 */
+		if (!IS_ENABLED(CONFIG_ARM_BRBE_PMU)) {
+			pr_warn_once("BRBE is disabled, select CONFIG_ARM_BRBE_PMU\n");
+			return -EOPNOTSUPP;
+		}
+
+		if (event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_KERNEL) {
+			if (!perfmon_capable()) {
+				pr_warn_once("does not have permission for kernel branch filter\n");
+				return -EPERM;
+			}
+		}
+
+		/*
+		 * Branch stack sampling event can not be supported in
+		 * case either the required driver itself is absent or
+		 * BRBE buffer, is not supported. Besides checking for
+		 * the callback prevents a crash in case it's absent.
+		 */
+		if (!armpmu->brbe_supported || !armpmu->brbe_supported(event)) {
+			pr_warn_once("BRBE is not supported\n");
+			return -EOPNOTSUPP;
+		}
+	}
 
 	if (armpmu->map_event(event) == -ENOENT)
 		return -ENOENT;
-- 
2.25.1