diff options
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm-cmn.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index 8b98ca9666d0..005a0d83bcac 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; } |