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authorWill Deacon <will.deacon@arm.com>2017-08-08 18:58:33 +0300
committerWill Deacon <will.deacon@arm.com>2017-08-08 19:12:34 +0300
commit6c833bb9247ed51028279ef7b82ebbbe60d789e3 (patch)
treef465e7a2151a31657057cfbbb71409920ae47db4 /drivers/perf
parentc1be2ddb1e25ecf425d93a81dc64a650b9ff3107 (diff)
downloadlinux-6c833bb9247ed51028279ef7b82ebbbe60d789e3.tar.xz
arm64: perf: Allow standard PMUv3 events to be extended by the CPU type
Rather than continue adding CPU-specific event maps, instead look up by default in the PMUv3 event map and only fallback to the CPU-specific maps if either the event isn't described by PMUv3, or it is described but the PMCEID registers say that it is unsupported by the current CPU. Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm_pmu.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 1c5e0f333779..d14fc2e67f93 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -47,6 +47,9 @@ armpmu_map_cache_event(const unsigned (*cache_map)
if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
return -EINVAL;
+ if (!cache_map)
+ return -ENOENT;
+
ret = (int)(*cache_map)[cache_type][cache_op][cache_result];
if (ret == CACHE_OP_UNSUPPORTED)
@@ -63,6 +66,9 @@ armpmu_map_hw_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
if (config >= PERF_COUNT_HW_MAX)
return -EINVAL;
+ if (!event_map)
+ return -ENOENT;
+
mapping = (*event_map)[config];
return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
}