[PATCH 2/3] drm/i915/gt: Mark context->active_count as protected by timeline->mutex

[Chris Wilson <chris@chris-wilson.co.uk>]

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>
---
 drivers/gpu/drm/i915/gt/intel_context.h       |  3 +++
 drivers/gpu/drm/i915/gt/intel_context_types.h |  2 +-
 drivers/gpu/drm/i915/gt/intel_engine_pm.c     | 14 ++++++++++++++
 drivers/gpu/drm/i915/gt/intel_timeline.c      |  4 ++++
 drivers/gpu/drm/i915/i915_request.c           |  3 ++-
 5 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h
index 053a1307ecb4..dd742ac2fbdb 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.h
+++ b/drivers/gpu/drm/i915/gt/intel_context.h
@@ -89,17 +89,20 @@ void intel_context_exit_engine(struct intel_context *ce);
 
 static inline void intel_context_enter(struct intel_context *ce)
 {
+	lockdep_assert_held(&ce->timeline->mutex);
 	if (!ce->active_count++)
 		ce->ops->enter(ce);
 }
 
 static inline void intel_context_mark_active(struct intel_context *ce)
 {
+	lockdep_assert_held(&ce->timeline->mutex);
 	++ce->active_count;
 }
 
 static inline void intel_context_exit(struct intel_context *ce)
 {
+	lockdep_assert_held(&ce->timeline->mutex);
 	GEM_BUG_ON(!ce->active_count);
 	if (!--ce->active_count)
 		ce->ops->exit(ce);
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index d8ce266c049f..bf9cedfccbf0 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -59,7 +59,7 @@ struct intel_context {
 	u32 *lrc_reg_state;
 	u64 lrc_desc;
 
-	unsigned int active_count; /* notionally protected by timeline->mutex */
+	unsigned int active_count; /* protected by timeline->mutex */
 
 	atomic_t pin_count;
 	struct mutex pin_mutex; /* guards pinning and associated on-gpuing */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
index f3f0109f9e22..5f03f7dcad72 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
@@ -37,6 +37,16 @@ static int __engine_unpark(struct intel_wakeref *wf)
 	return 0;
 }
 
+static inline void __timeline_mark_lock(struct intel_context *ce)
+{
+	mutex_acquire(&ce->timeline->mutex.dep_map, 2, 0, _THIS_IP_);
+}
+
+static inline void __timeline_mark_unlock(struct intel_context *ce)
+{
+	mutex_release(&ce->timeline->mutex.dep_map, 0, _THIS_IP_);
+}
+
 static bool switch_to_kernel_context(struct intel_engine_cs *engine)
 {
 	struct i915_request *rq;
@@ -61,6 +71,8 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine)
 	 * retiring the last request, thus all rings should be empty and
 	 * all timelines idle.
 	 */
+	__timeline_mark_lock(engine->kernel_context);
+
 	rq = __i915_request_create(engine->kernel_context, GFP_NOWAIT);
 	if (IS_ERR(rq))
 		/* Context switch failed, hope for the best! Maybe reset? */
@@ -80,6 +92,8 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine)
 	__intel_wakeref_defer_park(&engine->wakeref);
 	__i915_request_queue(rq, NULL);
 
+	__timeline_mark_unlock(engine->kernel_context);
+
 	return false;
 }
 
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;
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 174c7fdd02ff..7edcd0fef5c6 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1087,7 +1087,8 @@ __i915_request_add_to_timeline(struct i915_request *rq)
 	 * precludes optimising to use semaphores serialisation of a single
 	 * timeline across engines.
 	 */
-	prev = rcu_dereference_protected(timeline->last_request.request, 1);
+	prev = rcu_dereference_protected(timeline->last_request.request,
+					 lockdep_is_held(&timeline->mutex));
 	if (prev && !i915_request_completed(prev)) {
 		if (is_power_of_2(prev->engine->mask | rq->engine->mask))
 			i915_sw_fence_await_sw_fence(&rq->submit,
-- 
2.23.0.rc1

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