6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Robin Murphy robin.murphy@arm.com
[ Upstream commit e3e73f511c49c741f6309862c2248958ad77bbaa ]
It transpires that dtm_unit_info is another register which got shuffled in CMN-700 without me noticing. Fix that in a way which also proactively fixes the fragile laziness of its consumer, just in case any further fields ever get added alongside dtc_domain.
Fixes: 23760a014417 ("perf/arm-cmn: Add CMN-700 support") Signed-off-by: Robin Murphy robin.murphy@arm.com Reviewed-by: Ilkka Koskinen ilkka@os.amperecomputing.com Link: https://lore.kernel.org/r/3076ee83d0554f6939fbb6ee49ab2bdb28d8c7ee.169782421... Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/perf/arm-cmn.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index 6b50bc5519846..caae2d3e9d3ea 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -112,7 +112,9 @@
#define CMN_DTM_PMEVCNTSR 0x240
-#define CMN_DTM_UNIT_INFO 0x0910 +#define CMN650_DTM_UNIT_INFO 0x0910 +#define CMN_DTM_UNIT_INFO 0x0960 +#define CMN_DTM_UNIT_INFO_DTC_DOMAIN GENMASK_ULL(1, 0)
#define CMN_DTM_NUM_COUNTERS 4 /* Want more local counters? Why not replicate the whole DTM! Ugh... */ @@ -2117,6 +2119,16 @@ static int arm_cmn_init_dtcs(struct arm_cmn *cmn) return 0; }
+static unsigned int arm_cmn_dtc_domain(struct arm_cmn *cmn, void __iomem *xp_region) +{ + int offset = CMN_DTM_UNIT_INFO; + + if (cmn->part == PART_CMN650 || cmn->part == PART_CI700) + offset = CMN650_DTM_UNIT_INFO; + + return FIELD_GET(CMN_DTM_UNIT_INFO_DTC_DOMAIN, readl_relaxed(xp_region + offset)); +} + static void arm_cmn_init_node_info(struct arm_cmn *cmn, u32 offset, struct arm_cmn_node *node) { int level; @@ -2248,7 +2260,7 @@ static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset) if (cmn->part == PART_CMN600) xp->dtc = 0xf; else - xp->dtc = 1 << readl_relaxed(xp_region + CMN_DTM_UNIT_INFO); + xp->dtc = 1 << arm_cmn_dtc_domain(cmn, xp_region);
xp->dtm = dtm - cmn->dtms; arm_cmn_init_dtm(dtm++, xp, 0);