diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-08-16 13:09:59 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-08-16 18:02:06 +0100 |
| commit | 6c69a45445af924378371ce3ae3fbe20c4657b94 (patch) | |
| tree | 5426a2907e0afa73ecfa02e9a5a5027795f7bc31 /drivers/gpu/drm/i915/gt/intel_timeline.c | |
| parent | f789fbb1eb16de8db1e2eb7b6648f85464326195 (diff) | |
drm/i915/gt: Mark context->active_count as protected by timeline->mutex
We use timeline->mutex to protect modifications to
context->active_count, and the associated enable/disable callbacks.
Due to complications with engine-pm barrier there is a path where we used
a "superlock" to provide serialised protect and so could not
unconditionally assert with lockdep that it was always held. However,
we can mark the mutex as taken (noting that we may be nested underneath
ourselves) which means we can be reassured the right timeline->mutex is
always treated as held and let lockdep roam free.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190816121000.8507-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_timeline.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_timeline.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c index 7b476cd55dac..eafd94d5e211 100644 --- a/drivers/gpu/drm/i915/gt/intel_timeline.c +++ b/drivers/gpu/drm/i915/gt/intel_timeline.c @@ -338,6 +338,8 @@ void intel_timeline_enter(struct intel_timeline *tl) { struct intel_gt_timelines *timelines = &tl->gt->timelines; + lockdep_assert_held(&tl->mutex); + GEM_BUG_ON(!atomic_read(&tl->pin_count)); if (tl->active_count++) return; @@ -352,6 +354,8 @@ void intel_timeline_exit(struct intel_timeline *tl) { struct intel_gt_timelines *timelines = &tl->gt->timelines; + lockdep_assert_held(&tl->mutex); + GEM_BUG_ON(!tl->active_count); if (--tl->active_count) return; |