[PATCH 1/4] perf: arm_cspmu: Split 64-bit write to 32-bit writes

From: Ilkka Koskinen
Date: Wed Jun 21 2023 - 21:12:36 EST


Split the 64-bit register accesses if 64-bit access is not supported
by the PMU.

Signed-off-by: Ilkka Koskinen <ilkka@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/perf/arm_cspmu/arm_cspmu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index e2b7827c4563..0f517152cb4e 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -696,7 +696,10 @@ static void arm_cspmu_write_counter(struct perf_event *event, u64 val)
if (use_64b_counter_reg(cspmu)) {
offset = counter_offset(sizeof(u64), event->hw.idx);

- writeq(val, cspmu->base1 + offset);
+ if (cspmu->has_atomic_dword)
+ writeq(val, cspmu->base1 + offset);
+ else
+ lo_hi_writeq(val, cspmu->base1 + offset);
} else {
offset = counter_offset(sizeof(u32), event->hw.idx);

--
2.40.1