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authorYicong Yang <yangyicong@hisilicon.com>2023-08-14 15:40:12 +0300
committerWill Deacon <will@kernel.org>2023-08-15 14:50:53 +0300
commit0242737dc4eb9f6e9a5ea594b3f93efa0b12f28d (patch)
treed2fb73c51f6d8711c94248be23b6a581175a2abe /drivers/acpi
parent90d68677226ac7cf344648919df2016686b3e2ab (diff)
downloadlinux-0242737dc4eb9f6e9a5ea594b3f93efa0b12f28d.tar.xz
perf/smmuv3: Enable HiSilicon Erratum 162001900 quirk for HIP08/09
Some HiSilicon SMMU PMCG suffers the erratum 162001900 that the PMU disable control sometimes fail to disable the counters. This will lead to error or inaccurate data since before we enable the counters the counter's still counting for the event used in last perf session. This patch tries to fix this by hardening the global disable process. Before disable the PMU, writing an invalid event type (0xffff) to focibly stop the counters. Correspondingly restore each events on pmu::pmu_enable(). Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Link: https://lore.kernel.org/r/20230814124012.58013-1-yangyicong@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/arm64/iort.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 3631230a61c8..2c1640fd2b16 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1711,7 +1711,10 @@ static void __init arm_smmu_v3_pmcg_init_resources(struct resource *res,
static struct acpi_platform_list pmcg_plat_info[] __initdata = {
/* HiSilicon Hip08 Platform */
{"HISI ", "HIP08 ", 0, ACPI_SIG_IORT, greater_than_or_equal,
- "Erratum #162001800", IORT_SMMU_V3_PMCG_HISI_HIP08},
+ "Erratum #162001800, Erratum #162001900", IORT_SMMU_V3_PMCG_HISI_HIP08},
+ /* HiSilicon Hip09 Platform */
+ {"HISI ", "HIP09 ", 0, ACPI_SIG_IORT, greater_than_or_equal,
+ "Erratum #162001900", IORT_SMMU_V3_PMCG_HISI_HIP09},
{ }
};