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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-07-10 11:58:01 +0300
committerWill Deacon <will.deacon@arm.com>2018-07-10 20:19:02 +0300
commit7dfc8db1d117ae08c649266d5459ac8b10800d6e (patch)
treec505fcfe33f8c4ab61cb2ee4baf385a465f51458 /drivers/perf
parente2da97d328d4951d25f6634eda7213f7257417b6 (diff)
downloadlinux-7dfc8db1d117ae08c649266d5459ac8b10800d6e.tar.xz
arm_pmu: Tidy up clear_event_idx call backs
The armpmu uses get_event_idx callback to allocate an event counter for a given event, which marks the selected counter as "used". Now, when we delete the counter, the arm_pmu goes ahead and clears the "used" bit and then invokes the "clear_event_idx" call back, which kind of splits the job between the core code and the backend. To keep things tidy, mandate the implementation of clear_event_idx() and add it for exisiting backends. This will be useful for adding the chained event support, where we leave the event idx maintenance to the backend. Also, when an event is removed from the PMU, reset the hw.idx to indicate that a counter is not allocated for this event, to help the backends do better checks. This will be also used for the chain counter support. Cc: Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Julien Thierry <julien.thierry@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm_pmu.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 8cad6b535a2c..a28881058f18 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -238,11 +238,10 @@ armpmu_del(struct perf_event *event, int flags)
armpmu_stop(event, PERF_EF_UPDATE);
hw_events->events[idx] = NULL;
- clear_bit(idx, hw_events->used_mask);
- if (armpmu->clear_event_idx)
- armpmu->clear_event_idx(hw_events, event);
-
+ armpmu->clear_event_idx(hw_events, event);
perf_event_update_userpage(event);
+ /* Clear the allocated counter */
+ hwc->idx = -1;
}
static int