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perf/arm-cmn: Fix CMN S3 DTM offset 

CMN S3's DTM offset is different between r0px and r1p0, and it
turns out this was not a error in the earlier documentation, but
does actually exist in the design. Lovely.

Cc: stable@vger.kernel.org
Fixes: 0dc2f4963f ("perf/arm-cmn: Support CMN S3")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2025-09-18 17:25:31 +01:00 committed by Will Deacon
parent a29fea30dd
commit b3fe1c83a5
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/perf/arm-cmn.c
View File

@ -65,7 +65,7 @@
/* PMU registers occupy the 3rd 4KB page of each node's region */
#define CMN_PMU_OFFSET 0x2000
/* ...except when they don't :( */
#define CMN_S3_DTM_OFFSET 0xa000
#define CMN_S3_R1_DTM_OFFSET 0xa000
#define CMN_S3_PMU_OFFSET 0xd900
/* For most nodes, this is all there is */
@ -233,6 +233,9 @@ enum cmn_revision {
REV_CMN700_R1P0,
REV_CMN700_R2P0,
REV_CMN700_R3P0,
REV_CMNS3_R0P0 = 0,
REV_CMNS3_R0P1,
REV_CMNS3_R1P0,
REV_CI700_R0P0 = 0,
REV_CI700_R1P0,
REV_CI700_R2P0,
@ -425,8 +428,8 @@ static enum cmn_model arm_cmn_model(const struct arm_cmn *cmn)
static int arm_cmn_pmu_offset(const struct arm_cmn *cmn, const struct arm_cmn_node *dn)
{
if (cmn->part == PART_CMN_S3) {
if (dn->type == CMN_TYPE_XP)
return CMN_S3_DTM_OFFSET;
if (cmn->rev >= REV_CMNS3_R1P0 && dn->type == CMN_TYPE_XP)
return CMN_S3_R1_DTM_OFFSET;
return CMN_S3_PMU_OFFSET;
}
return CMN_PMU_OFFSET;