drm/vc4: Hook up plane prepare_fb to lookup dma-buf reservations.

We should allow SIGIO and things to interrupt us before we get to the no-error stage of the commit process. This code is effectively copied from drm_atomic_helper_commit().

Signed-off-by Eric Anholt <[email protected]>

---
 drivers/gpu/drm/vc4/vc4_kms.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

drivers/gpu/drm/vc4/vc4_kms.c +3 -0

index bc6ecdc6f104..6b1ccea76243 100644
@@ -142,6 +142,16 @@ static int vc4_atomic_commit(struct drm_device *dev,
 		return ret;
 	}
 
+	if (!nonblock) {
+		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
+		if (ret) {

Now that we're using the atomic helpers for fence waits, we can use the same codepath as drm_atomic_helper_commit() does for async, getting rid of our custom vc4_commit struct.

Signed-off-by Eric Anholt <[email protected]>

---
 drivers/gpu/drm/vc4/vc4_kms.c | 71 ++++++++-----------------------------------
 1 file changed, 13 insertions(+), 58 deletions(-)

drivers/gpu/drm/vc4/vc4_kms.c +13 -58

index 6b1ccea76243..b371879c3901 100644
@@ -29,16 +29,9 @@ static void vc4_output_poll_changed(struct drm_device *dev)
 	drm_fbdev_cma_hotplug_event(vc4->fbdev);
 }
 
-struct vc4_commit {
-	struct drm_device *dev;
-	struct drm_atomic_state *state;
-	struct vc4_seqno_cb cb;
-};
-
 static void
-vc4_atomic_complete_commit(struct vc4_commit *c)
+vc4_atomic_complete_commit(struct drm_atomic_state *state)
 {
-	struct drm_atomic_state *state = c->state;
 	struct drm_device *dev = state->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 

@@ -72,28 +65,14 @@ vc4_atomic_complete_commit(struct vc4_commit *c)
 	drm_atomic_state_put(state);
 
 	up(&vc4->async_modeset);
-
-	kfree(c);
-}
-
-static void
-vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb)
-{
-	struct vc4_commit *c = container_of(cb, struct vc4_commit, cb);
-
-	vc4_atomic_complete_commit(c);
 }
 
-static struct vc4_commit *commit_init(struct drm_atomic_state *state)
+static void commit_work(struct work_struct *work)
 {
-	struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
-
-	if (!c)
-		return NULL;
-	c->dev = state->dev;
-	c->state = state;
-
-	return c;
+	struct drm_atomic_state *state = container_of(work,
+						      struct drm_atomic_state,
+						      commit_work);
+	vc4_atomic_complete_commit(state);
 }
 
 /**

@@ -115,29 +94,19 @@ static int vc4_atomic_commit(struct drm_device *dev,
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int ret;
-	int i;
-	uint64_t wait_seqno = 0;
-	struct vc4_commit *c;
-	struct drm_plane *plane;
-	struct drm_plane_state *new_state;
-
-	c = commit_init(state);
-	if (!c)
-		return -ENOMEM;
 
 	ret = drm_atomic_helper_setup_commit(state, nonblock);
 	if (ret)
 		return ret;
 
+	INIT_WORK(&state->commit_work, commit_work);
+
 	ret = down_interruptible(&vc4->async_modeset);
-	if (ret) {
-		kfree(c);
+	if (ret)
 		return ret;
-	}
 
 	ret = drm_atomic_helper_prepare_planes(dev, state);
 	if (ret) {
-		kfree(c);
 		up(&vc4->async_modeset);
 		return ret;
 	}

@@ -146,22 +115,11 @@ static int vc4_atomic_commit(struct drm_device *dev,
 		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
 		if (ret) {
 			drm_atomic_helper_cleanup_planes(dev, state);
-			kfree(c);
 			up(&vc4->async_modeset);
 			return ret;
 		}
 	}
 
-	for_each_plane_in_state(state, plane, new_state, i) {
-		if ((plane->state->fb != new_state->fb) && new_state->fb) {
-			struct drm_gem_cma_object *cma_bo =
-				drm_fb_cma_get_gem_obj(new_state->fb, 0);
-			struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
-
-			wait_seqno = max(bo->seqno, wait_seqno);
-		}
-	}
-
 	/*
 	 * This is the point of no return - everything below never fails except
 	 * when the hw goes bonghits. Which means we can commit the new state on

@@ -187,13 +145,10 @@ static int vc4_atomic_commit(struct drm_device *dev,
 	 */
 
 	drm_atomic_state_get(state);
-	if (nonblock) {
-		vc4_queue_seqno_cb(dev, &c->cb, wait_seqno,
-				   vc4_atomic_complete_commit_seqno_cb);
-	} else {
-		vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false);
-		vc4_atomic_complete_commit(c);
-	}
+	if (nonblock)
+		queue_work(system_unbound_wq, &state->commit_work);
+	else
+		vc4_atomic_complete_commit(state);
 
 	return 0;
 }

Signature · 6 lines

2.11.0

_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/dri-devel

Quoted 3 lines · Eric Anholt

Now that we're using the atomic helpers for fence waits, we can use the same codepath as drm_atomic_helper_commit() does for async, getting rid of our custom vc4_commit struct.

\o/

On the series: Acked-by: Daniel Vetter <[email protected]>

Now that we're using the atomic helpers for fence waits, we can use the same codepath as drm_atomic_helper_commit() does for async, getting rid of our custom vc4_commit struct.

Signed-off-by Eric Anholt <[email protected]>

---
 drivers/gpu/drm/vc4/vc4_kms.c | 71 ++++++++-----------------------------------
 1 file changed, 13 insertions(+), 58 deletions(-)

drivers/gpu/drm/vc4/vc4_kms.c +9 -55

index 6b1ccea76243..b371879c3901 100644
@@ -29,16 +29,9 @@ static void vc4_output_poll_changed(struct drm_device *dev)
 	drm_fbdev_cma_hotplug_event(vc4->fbdev);
 }
 
-struct vc4_commit {
-	struct drm_device *dev;
-	struct drm_atomic_state *state;
-	struct vc4_seqno_cb cb;
-};
-
 static void
-vc4_atomic_complete_commit(struct vc4_commit *c)
+vc4_atomic_complete_commit(struct drm_atomic_state *state)
 {
-	struct drm_atomic_state *state = c->state;
 	struct drm_device *dev = state->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 

@@ -72,28 +65,14 @@ vc4_atomic_complete_commit(struct vc4_commit *c)
 	drm_atomic_state_put(state);
 
 	up(&vc4->async_modeset);
-
-	kfree(c);
-}
-
-static void
-vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb)
-{
-	struct vc4_commit *c = container_of(cb, struct vc4_commit, cb);
-
-	vc4_atomic_complete_commit(c);
 }
 
-static struct vc4_commit *commit_init(struct drm_atomic_state *state)
+static void commit_work(struct work_struct *work)
 {
-	struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
-
-	if (!c)
-		return NULL;
-	c->dev = state->dev;
-	c->state = state;
-
-	return c;
+	struct drm_atomic_state *state = container_of(work,
+						      struct drm_atomic_state,
+						      commit_work);
+	vc4_atomic_complete_commit(state);
 }
 
 /**

@@ -115,29 +94,19 @@ static int vc4_atomic_commit(struct drm_device *dev,
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int ret;
-	int i;
-	uint64_t wait_seqno = 0;
-	struct vc4_commit *c;
-	struct drm_plane *plane;
-	struct drm_plane_state *new_state;
-
-	c = commit_init(state);
-	if (!c)
-		return -ENOMEM;
 
 	ret = drm_atomic_helper_setup_commit(state, nonblock);
 	if (ret)
 		return ret;
 
+	INIT_WORK(&state->commit_work, commit_work);
+
 	ret = down_interruptible(&vc4->async_modeset);
-	if (ret) {
-		kfree(c);
+	if (ret)
 		return ret;
-	}
 
 	ret = drm_atomic_helper_prepare_planes(dev, state);
 	if (ret) {
-		kfree(c);
 		up(&vc4->async_modeset);
 		return ret;
 	}

@@ -146,22 +115,11 @@ static int vc4_atomic_commit(struct drm_device *dev,
 		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
 		if (ret) {
 			drm_atomic_helper_cleanup_planes(dev, state);
-			kfree(c);
 			up(&vc4->async_modeset);
 			return ret;
 		}
 	}
 
-	for_each_plane_in_state(state, plane, new_state, i) {
-		if ((plane->state->fb != new_state->fb) && new_state->fb) {
-			struct drm_gem_cma_object *cma_bo =
-				drm_fb_cma_get_gem_obj(new_state->fb, 0);
-			struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
-
-			wait_seqno = max(bo->seqno, wait_seqno);
-		}
-	}
-
 	/*
 	 * This is the point of no return - everything below never fails except
 	 * when the hw goes bonghits. Which means we can commit the new state on

@@ -187,13 +145,10 @@ static int vc4_atomic_commit(struct drm_device *dev,
 	 */
 
 	drm_atomic_state_get(state);
-	if (nonblock) {
-		vc4_queue_seqno_cb(dev, &c->cb, wait_seqno,
-				   vc4_atomic_complete_commit_seqno_cb);
-	} else {

It is no longer used as of commit 34c8ea400ff6 ("drm/vc4: Mimic drm_atomic_helper_commit() behavior")

Signed-off-by Eric Anholt <[email protected]>

---
 drivers/gpu/drm/vc4/vc4_crtc.c | 8 --------
 drivers/gpu/drm/vc4/vc4_drv.h  | 1 -
 2 files changed, 9 deletions(-)

drivers/gpu/drm/vc4/vc4_crtc.c +0 -8

index 30a1df11e063..f20c01759c0d 100644
@@ -674,14 +674,6 @@ static void vc4_disable_vblank(struct drm_crtc *crtc)
 	CRTC_WRITE(PV_INTEN, 0);
 }
 
-/* Must be called with the event lock held */
-bool vc4_event_pending(struct drm_crtc *crtc)
-{
-	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
-
-	return !!vc4_crtc->event;
-}
-
 static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
 {
 	struct drm_crtc *crtc = &vc4_crtc->base;

drivers/gpu/drm/vc4/vc4_drv.h +0 -0

index df22698d62ee..1047953216a8 100644

This way drm_atomic_helper_wait_for_fences() will actually do something. The vc4_seqno_cb has been doing the fence waits on V3D manually, so far.

Signed-off-by Eric Anholt <[email protected]>

---
 drivers/gpu/drm/vc4/vc4_plane.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

drivers/gpu/drm/vc4/vc4_plane.c +13 -0

index fa6809d8b0fe..8853e9a4f005 100644
@@ -759,9 +759,26 @@ void vc4_plane_async_set_fb(struct drm_plane *plane, struct drm_framebuffer *fb)
 	vc4_state->dlist[vc4_state->ptr0_offset] = addr;
 }
 
+static int vc4_prepare_fb(struct drm_plane *plane,
+			  struct drm_plane_state *state)
+{
+	struct vc4_bo *bo;
+	struct dma_fence *fence;
+
+	if ((plane->state->fb == state->fb) || !state->fb)
+		return 0;
+
+	bo = to_vc4_bo(&drm_fb_cma_get_gem_obj(state->fb, 0)->base);
+	fence = reservation_object_get_excl_rcu(bo->resv);
+	drm_atomic_set_fence_for_plane(state, fence);
+