[PATCH 26/26] drm/i915: Markup expected timeline locks for i915_active

Chris Wilson chris at chris-wilson.co.uk
Sat Jul 27 20:53:25 UTC 2019


As every i915_active_request should be serialised by a dedicated lock,
i915_active consists of a tree of locks; one for each node. Markup up
the i915_active_request with what lock is supposed to be guarding it so
that we can verify that the serialised updated are indeed serialised.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/display/intel_overlay.c      |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_client_blt.c    |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_context.c       |  2 +-
 drivers/gpu/drm/i915/gt/intel_context.c           |  2 +-
 drivers/gpu/drm/i915/gt/intel_engine_pool.h       |  2 +-
 drivers/gpu/drm/i915/gt/intel_timeline.c          |  7 +++----
 drivers/gpu/drm/i915/gt/selftest_timeline.c       |  4 ++++
 drivers/gpu/drm/i915/gt/selftests/mock_timeline.c |  2 +-
 drivers/gpu/drm/i915/i915_active.c                | 15 +++++++++++----
 drivers/gpu/drm/i915/i915_active.h                | 12 ++++++++++--
 drivers/gpu/drm/i915/i915_active_types.h          |  3 +++
 drivers/gpu/drm/i915/i915_vma.c                   |  4 ++--
 drivers/gpu/drm/i915/selftests/i915_active.c      |  3 +--
 13 files changed, 40 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c
index 1a15fa34205c..d5e06b463567 100644
--- a/drivers/gpu/drm/i915/display/intel_overlay.c
+++ b/drivers/gpu/drm/i915/display/intel_overlay.c
@@ -230,7 +230,7 @@ alloc_request(struct intel_overlay *overlay, void (*fn)(struct intel_overlay *))
 	if (IS_ERR(rq))
 		return rq;
 
-	err = i915_active_ref(&overlay->last_flip, rq->fence.context, rq);
+	err = i915_active_ref(&overlay->last_flip, rq->timeline, rq);
 	if (err) {
 		i915_request_add(rq);
 		return ERR_PTR(err);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c b/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
index 2312a0c6af89..f15b0b82e562 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
@@ -197,7 +197,7 @@ static void clear_pages_worker(struct work_struct *work)
 	 * keep track of the GPU activity within this vma/request, and
 	 * propagate the signal from the request to w->dma.
 	 */
-	err = i915_active_ref(&vma->active, rq->fence.context, rq);
+	err = i915_active_ref(&vma->active, rq->timeline, rq);
 	if (err)
 		goto out_request;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 575ff64e1e4a..030248e018ad 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -925,7 +925,7 @@ static int context_barrier_task(struct i915_gem_context *ctx,
 		if (emit)
 			err = emit(rq, data);
 		if (err == 0)
-			err = i915_active_ref(&cb->base, rq->fence.context, rq);
+			err = i915_active_ref(&cb->base, rq->timeline, rq);
 
 		i915_request_add(rq);
 		if (err)
diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
index 4acd27f47576..c64391554d34 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -300,7 +300,7 @@ int intel_context_prepare_remote_request(struct intel_context *ce,
 	 * words transfer the pinned ce object to tracked active request.
 	 */
 	GEM_BUG_ON(i915_active_is_idle(&ce->active));
-	err = i915_active_ref(&ce->active, rq->fence.context, rq);
+	err = i915_active_ref(&ce->active, rq->timeline, rq);
 
 unlock:
 	if (rq->timeline != tl)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pool.h b/drivers/gpu/drm/i915/gt/intel_engine_pool.h
index f7a0a660c1c9..8d069efd9457 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pool.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pool.h
@@ -18,7 +18,7 @@ static inline int
 intel_engine_pool_mark_active(struct intel_engine_pool_node *node,
 			      struct i915_request *rq)
 {
-	return i915_active_ref(&node->active, rq->fence.context, rq);
+	return i915_active_ref(&node->active, rq->timeline, rq);
 }
 
 static inline void
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index eafd94d5e211..02fbe11b671b 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -254,7 +254,7 @@ int intel_timeline_init(struct intel_timeline *timeline,
 
 	mutex_init(&timeline->mutex);
 
-	INIT_ACTIVE_REQUEST(&timeline->last_request);
+	INIT_ACTIVE_REQUEST(&timeline->last_request, &timeline->mutex);
 	INIT_LIST_HEAD(&timeline->requests);
 
 	i915_syncmap_init(&timeline->sync);
@@ -440,8 +440,7 @@ __intel_timeline_get_seqno(struct intel_timeline *tl,
 	 * free it after the current request is retired, which ensures that
 	 * all writes into the cacheline from previous requests are complete.
 	 */
-	err = i915_active_ref(&tl->hwsp_cacheline->active,
-			      tl->fence_context, rq);
+	err = i915_active_ref(&tl->hwsp_cacheline->active, tl, rq);
 	if (err)
 		goto err_cacheline;
 
@@ -492,7 +491,7 @@ int intel_timeline_get_seqno(struct intel_timeline *tl,
 static int cacheline_ref(struct intel_timeline_cacheline *cl,
 			 struct i915_request *rq)
 {
-	return i915_active_ref(&cl->active, rq->fence.context, rq);
+	return i915_active_ref(&cl->active, rq->timeline, rq);
 }
 
 int intel_timeline_read_hwsp(struct i915_request *from,
diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c b/drivers/gpu/drm/i915/gt/selftest_timeline.c
index d54113697745..321481403165 100644
--- a/drivers/gpu/drm/i915/gt/selftest_timeline.c
+++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c
@@ -689,7 +689,9 @@ static int live_hwsp_wrap(void *arg)
 
 		tl->seqno = -4u;
 
+		mutex_lock_nested(&tl->mutex, SINGLE_DEPTH_NESTING);
 		err = intel_timeline_get_seqno(tl, rq, &seqno[0]);
+		mutex_unlock(&tl->mutex);
 		if (err) {
 			i915_request_add(rq);
 			goto out;
@@ -704,7 +706,9 @@ static int live_hwsp_wrap(void *arg)
 		}
 		hwsp_seqno[0] = tl->hwsp_seqno;
 
+		mutex_lock_nested(&tl->mutex, SINGLE_DEPTH_NESTING);
 		err = intel_timeline_get_seqno(tl, rq, &seqno[1]);
+		mutex_unlock(&tl->mutex);
 		if (err) {
 			i915_request_add(rq);
 			goto out;
diff --git a/drivers/gpu/drm/i915/gt/selftests/mock_timeline.c b/drivers/gpu/drm/i915/gt/selftests/mock_timeline.c
index 5c549205828a..598170efcaf6 100644
--- a/drivers/gpu/drm/i915/gt/selftests/mock_timeline.c
+++ b/drivers/gpu/drm/i915/gt/selftests/mock_timeline.c
@@ -15,7 +15,7 @@ void mock_timeline_init(struct intel_timeline *timeline, u64 context)
 
 	mutex_init(&timeline->mutex);
 
-	INIT_ACTIVE_REQUEST(&timeline->last_request);
+	INIT_ACTIVE_REQUEST(&timeline->last_request, &timeline->mutex);
 	INIT_LIST_HEAD(&timeline->requests);
 
 	i915_syncmap_init(&timeline->sync);
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
index d047752baccb..7351d4f25f18 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -163,10 +163,11 @@ node_retire(struct i915_active_request *base, struct i915_request *rq)
 }
 
 static struct i915_active_request *
-active_instance(struct i915_active *ref, u64 idx)
+active_instance(struct i915_active *ref, struct intel_timeline *tl)
 {
 	struct active_node *node, *prealloc;
 	struct rb_node **p, *parent;
+	u64 idx = tl->fence_context;
 
 	/*
 	 * We track the most recently used timeline to skip a rbtree search
@@ -205,7 +206,7 @@ active_instance(struct i915_active *ref, u64 idx)
 	}
 
 	node = prealloc;
-	i915_active_request_init(&node->base, NULL, node_retire);
+	i915_active_request_init(&node->base, &tl->mutex, NULL, node_retire);
 	node->ref = ref;
 	node->timeline = idx;
 
@@ -266,18 +267,20 @@ static bool __active_del_barrier(struct i915_active *ref,
 }
 
 int i915_active_ref(struct i915_active *ref,
-		    u64 timeline,
+		    struct intel_timeline *tl,
 		    struct i915_request *rq)
 {
 	struct i915_active_request *active;
 	int err;
 
+	lockdep_assert_held(&tl->mutex);
+
 	/* Prevent reaping in case we malloc/wait while building the tree */
 	err = i915_active_acquire(ref);
 	if (err)
 		return err;
 
-	active = active_instance(ref, timeline);
+	active = active_instance(ref, tl);
 	if (!active) {
 		err = -ENOMEM;
 		goto out;
@@ -634,6 +637,10 @@ int i915_active_request_set(struct i915_active_request *active,
 {
 	int err;
 
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+	lockdep_assert_held(active->lock);
+#endif
+
 	/* Must maintain ordering wrt previous active requests */
 	err = i915_request_await_active_request(rq, active);
 	if (err)
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
index f6d730cf2fe6..f95058f99057 100644
--- a/drivers/gpu/drm/i915/i915_active.h
+++ b/drivers/gpu/drm/i915/i915_active.h
@@ -58,15 +58,20 @@ void i915_active_retire_noop(struct i915_active_request *active,
  */
 static inline void
 i915_active_request_init(struct i915_active_request *active,
+			 struct mutex *lock,
 			 struct i915_request *rq,
 			 i915_active_retire_fn retire)
 {
 	RCU_INIT_POINTER(active->request, rq);
 	INIT_LIST_HEAD(&active->link);
 	active->retire = retire ?: i915_active_retire_noop;
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+	active->lock = lock;
+#endif
 }
 
-#define INIT_ACTIVE_REQUEST(name) i915_active_request_init((name), NULL, NULL)
+#define INIT_ACTIVE_REQUEST(name, lock) \
+	i915_active_request_init((name), (lock), NULL, NULL)
 
 /**
  * i915_active_request_set - updates the tracker to watch the current request
@@ -81,6 +86,9 @@ static inline void
 __i915_active_request_set(struct i915_active_request *active,
 			  struct i915_request *request)
 {
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+	lockdep_assert_held(active->lock);
+#endif
 	list_move(&active->link, &request->active_list);
 	rcu_assign_pointer(active->request, request);
 }
@@ -362,7 +370,7 @@ void __i915_active_init(struct drm_i915_private *i915,
 } while (0)
 
 int i915_active_ref(struct i915_active *ref,
-		    u64 timeline,
+		    struct intel_timeline *tl,
 		    struct i915_request *rq);
 
 int i915_active_wait(struct i915_active *ref);
diff --git a/drivers/gpu/drm/i915/i915_active_types.h b/drivers/gpu/drm/i915/i915_active_types.h
index ae3ee441c114..d857bd12aa7e 100644
--- a/drivers/gpu/drm/i915/i915_active_types.h
+++ b/drivers/gpu/drm/i915/i915_active_types.h
@@ -24,6 +24,9 @@ struct i915_active_request {
 	struct i915_request __rcu *request;
 	struct list_head link;
 	i915_active_retire_fn retire;
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+	struct mutex *lock;
+#endif
 };
 
 struct active_node;
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index c387770c3764..f7f516a75c66 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -919,7 +919,7 @@ int i915_vma_move_to_active(struct i915_vma *vma,
 	 * add the active reference first and queue for it to be dropped
 	 * *last*.
 	 */
-	err = i915_active_ref(&vma->active, rq->fence.context, rq);
+	err = i915_active_ref(&vma->active, rq->timeline, rq);
 	if (unlikely(err))
 		return err;
 
@@ -929,7 +929,7 @@ int i915_vma_move_to_active(struct i915_vma *vma,
 
 		if (intel_frontbuffer_invalidate(obj->frontbuffer, ORIGIN_CS))
 			i915_active_ref(&obj->frontbuffer->write,
-					rq->fence.context,
+					rq->timeline,
 					rq);
 
 		obj->read_domains = 0;
diff --git a/drivers/gpu/drm/i915/selftests/i915_active.c b/drivers/gpu/drm/i915/selftests/i915_active.c
index e5cd5d47e380..77d844ac8b71 100644
--- a/drivers/gpu/drm/i915/selftests/i915_active.c
+++ b/drivers/gpu/drm/i915/selftests/i915_active.c
@@ -110,8 +110,7 @@ __live_active_setup(struct drm_i915_private *i915)
 						       submit,
 						       GFP_KERNEL);
 		if (err >= 0)
-			err = i915_active_ref(&active->base,
-					      rq->fence.context, rq);
+			err = i915_active_ref(&active->base, rq->timeline, rq);
 		i915_request_add(rq);
 		if (err) {
 			pr_err("Failed to track active ref!\n");
-- 
2.22.0



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