From 847eef94e6327dd7690bfac0bd3a81a7ba6aa1ee Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@arm.com>
Date: Fri, 3 Dec 2021 11:44:56 +0000
Subject: [PATCH] perf/arm-cmn: Optimise DTM counter reads
When multiple nodes of the same type are connected to the same XP
(particularly in CAL configurations), it seems that they are likely
to be consecutive in logical ID. Therefore, we're likely to gain a
small benefit from an easy tweak to optimise out consecutive reads
of the same set of DTM counters for an aggregated event.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/7777d77c2df17693cd3dabb6e268906e15238d82.1638530442.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
---
drivers/perf/arm-cmn.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 8b98ca9666d01..005a0d83bcac4 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -690,18 +690,19 @@ static void arm_cmn_pmu_disable(struct pmu *pmu)
static u64 arm_cmn_read_dtm(struct arm_cmn *cmn, struct arm_cmn_hw_event *hw,
bool snapshot)
{
+ struct arm_cmn_dtm *dtm = NULL;
struct arm_cmn_node *dn;
- unsigned int i, offset;
- u64 count = 0;
+ unsigned int i, offset, dtm_idx;
+ u64 reg, count = 0;
offset = snapshot ? CMN_DTM_PMEVCNTSR : CMN_DTM_PMEVCNT;
for_each_hw_dn(hw, dn, i) {
- struct arm_cmn_dtm *dtm = &cmn->dtms[dn->dtm];
- int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i);
- u64 reg = readq_relaxed(dtm->base + offset);
- u16 dtm_count = reg >> (dtm_idx * 16);
-
- count += dtm_count;
+ if (dtm != &cmn->dtms[dn->dtm]) {
+ dtm = &cmn->dtms[dn->dtm];
+ reg = readq_relaxed(dtm->base + offset);
+ }
+ dtm_idx = arm_cmn_get_index(hw->dtm_idx, i);
+ count += (u16)(reg >> (dtm_idx * 16));
}
return count;
}
--
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