Commit 8c282414 authored by Ilkka Koskinen's avatar Ilkka Koskinen Committed by Will Deacon
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perf: arm_cspmu: Split 64-bit write to 32-bit writes 



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

Signed-off-by: default avatarIlkka Koskinen <ilkka@os.amperecomputing.com>
Reviewed-by: default avatarBesar Wicaksono <bwicaksono@nvidia.com>
Reviewed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230913233941.9814-2-ilkka@os.amperecomputing.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent bfc653aa

drivers/perf/arm_cspmu/arm_cspmu.c

+4 −1
Original line number Diff line number Diff line
@@ -719,7 +719,10 @@ 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);



		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);