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authorIlkka Koskinen2023-09-13 16:39:38 -0700
committerWill Deacon2023-10-05 14:19:24 +0100
commit8c282414ca6209977cb6d6cc66470ca2d1e56bf6 (patch)
tree144fc9e86a27e2dc1b690b681cd2fa7dc5f5259b /drivers/perf
parentbfc653aa89cb05796d7b4e046600accb442c9b7a (diff)
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: Ilkka Koskinen <ilkka@os.amperecomputing.com> Reviewed-by: Besar Wicaksono <bwicaksono@nvidia.com> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20230913233941.9814-2-ilkka@os.amperecomputing.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm_cspmu/arm_cspmu.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index c59f1e5a35a3..5f4f04135a22 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -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);
- 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);