[PATCH 01/12] drivers/perf: arm_spe: Store event reserved bits in driver data

[Leo Yan]

Store the reserved event bits in the driver structure. This cached value
avoids redundant calls to arm_spe_pmsevfr_res0() each time a profiling
session is created.

Signed-off-by: Leo Yan <leo.yan at arm.com>
---
 drivers/perf/arm_spe_pmu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index 3efed8839a4ec5604eba242cb620327cd2a6a87d..be2ed326bb794d7e5dd1d6cfa89330753ced3ca5 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -77,6 +77,7 @@ struct arm_spe_pmu {
 	u16					pmsver;
 	u16					min_period;
 	u16					counter_sz;
+	u64					pmsevfr_res0;
 
 #define SPE_PMU_FEAT_FILT_EVT			(1UL << 0)
 #define SPE_PMU_FEAT_FILT_TYP			(1UL << 1)
@@ -722,10 +723,10 @@ static int arm_spe_pmu_event_init(struct perf_event *event)
 	    !cpumask_test_cpu(event->cpu, &spe_pmu->supported_cpus))
 		return -ENOENT;
 
-	if (arm_spe_event_to_pmsevfr(event) & arm_spe_pmsevfr_res0(spe_pmu->pmsver))
+	if (arm_spe_event_to_pmsevfr(event) & spe_pmu->pmsevfr_res0)
 		return -EOPNOTSUPP;
 
-	if (arm_spe_event_to_pmsnevfr(event) & arm_spe_pmsevfr_res0(spe_pmu->pmsver))
+	if (arm_spe_event_to_pmsnevfr(event) & spe_pmu->pmsevfr_res0)
 		return -EOPNOTSUPP;
 
 	if (attr->exclude_idle)
@@ -1103,6 +1104,8 @@ static void __arm_spe_pmu_dev_probe(void *info)
 		spe_pmu->counter_sz = 16;
 	}
 
+	spe_pmu->pmsevfr_res0 = arm_spe_pmsevfr_res0(spe_pmu->pmsver);
+
 	dev_info(dev,
 		 "probed SPEv1.%d for CPUs %*pbl [max_record_sz %u, align %u, features 0x%llx]\n",
 		 spe_pmu->pmsver - 1, cpumask_pr_args(&spe_pmu->supported_cpus),

-- 
2.34.1