[PATCH v4 1/6] drm/virtio: rework notification for better batching

[PATCH v4 1/6] drm/virtio: rework notification for better batching

[Gerd Hoffmann]

Drop the virtio_gpu_{disable,enable}_notify().  Add a new
virtio_gpu_notify() call instead, which must be called whenever
the driver wants make sure the host is notified needed.

Drop automatic notification from command submission.  Add
virtio_gpu_notify() calls after each command query instead.
This allows more fine-grained control over host notification
and can move around the notify calls in subsequent patches to
batch command submissions. With this in place it is also
possible to make notification optional for userspace ioctls.

Page flip batching goes away (temporarely).

v3:
 - move batching to separate patches.
v2:
 - rebase to latest drm-misc-next.
 - use "if (!atomic_read())".
 - add review & test tags.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h   |  6 ++--
 drivers/gpu/drm/virtio/virtgpu_plane.c |  4 ---
 drivers/gpu/drm/virtio/virtgpu_vq.c    | 50 ++++++++++++++++----------
 3 files changed, 33 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index af9403e1cf78..2f6c4ccbfd14 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -179,8 +179,7 @@ struct virtio_gpu_device {
 	struct virtio_gpu_queue cursorq;
 	struct kmem_cache *vbufs;
 
-	bool disable_notify;
-	bool pending_notify;
+	atomic_t pending_commands;
 
 	struct ida	resource_ida;
 
@@ -335,8 +334,7 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work);
 void virtio_gpu_dequeue_cursor_func(struct work_struct *work);
 void virtio_gpu_dequeue_fence_func(struct work_struct *work);
 
-void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev);
-void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev);
+void virtio_gpu_notify(struct virtio_gpu_device *vgdev);
 
 /* virtio_gpu_display.c */
 void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev);
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index d1c3f5fbfee4..08b2e4127eb3 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -154,8 +154,6 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 	if (!drm_atomic_helper_damage_merged(old_state, plane->state, &rect))
 		return;
 
-	virtio_gpu_disable_notify(vgdev);
-
 	bo = gem_to_virtio_gpu_obj(plane->state->fb->obj[0]);
 	if (bo->dumb)
 		virtio_gpu_update_dumb_bo(vgdev, plane->state, &rect);
@@ -186,8 +184,6 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 				      rect.y1,
 				      rect.x2 - rect.x1,
 				      rect.y2 - rect.y1);
-
-	virtio_gpu_enable_notify(vgdev);
 }
 
 static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane,
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 67caecde623e..6cc259cfa517 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -329,7 +329,6 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev,
 				      int incnt)
 {
 	struct virtqueue *vq = vgdev->ctrlq.vq;
-	bool notify = false;
 	int ret, idx;
 
 	if (!drm_dev_enter(vgdev->ddev, &idx)) {
@@ -368,16 +367,10 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev,
 
 	trace_virtio_gpu_cmd_queue(vq, virtio_gpu_vbuf_ctrl_hdr(vbuf));
 
-	notify = virtqueue_kick_prepare(vq);
+	atomic_inc(&vgdev->pending_commands);
 
 	spin_unlock(&vgdev->ctrlq.qlock);
 
-	if (notify) {
-		if (vgdev->disable_notify)
-			vgdev->pending_notify = true;
-		else
-			virtqueue_notify(vq);
-	}
 	drm_dev_exit(idx);
 }
 
@@ -434,19 +427,20 @@ static void virtio_gpu_queue_fenced_ctrl_buffer(struct virtio_gpu_device *vgdev,
 	}
 }
 
-void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev)
+void virtio_gpu_notify(struct virtio_gpu_device *vgdev)
 {
-	vgdev->disable_notify = true;
-}
+	bool notify;
 
-void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev)
-{
-	vgdev->disable_notify = false;
-
-	if (!vgdev->pending_notify)
+	if (!atomic_read(&vgdev->pending_commands))
 		return;
-	vgdev->pending_notify = false;
-	virtqueue_notify(vgdev->ctrlq.vq);
+
+	spin_lock(&vgdev->ctrlq.qlock);
+	atomic_set(&vgdev->pending_commands, 0);
+	notify = virtqueue_kick_prepare(vgdev->ctrlq.vq);
+	spin_unlock(&vgdev->ctrlq.qlock);
+
+	if (notify)
+		virtqueue_notify(vgdev->ctrlq.vq);
 }
 
 static void virtio_gpu_queue_ctrl_buffer(struct virtio_gpu_device *vgdev,
@@ -520,6 +514,7 @@ void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
 	cmd_p->height = cpu_to_le32(params->height);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
 	bo->created = true;
 }
 
@@ -549,6 +544,7 @@ void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev,
 
 	vbuf->resp_cb_data = bo;
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
@@ -571,6 +567,7 @@ void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
@@ -592,6 +589,7 @@ void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
@@ -624,6 +622,7 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
 }
 
 static void
@@ -647,6 +646,7 @@ virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev,
 	vbuf->data_size = sizeof(*ents) * nents;
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
 }
 
 static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
@@ -779,6 +779,7 @@ int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev)
 	vgdev->display_info_pending = true;
 	cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 	return 0;
 }
 
@@ -802,6 +803,7 @@ int virtio_gpu_cmd_get_capset_info(struct virtio_gpu_device *vgdev, int idx)
 	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_GET_CAPSET_INFO);
 	cmd_p->capset_index = cpu_to_le32(idx);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 	return 0;
 }
 
@@ -877,6 +879,7 @@ int virtio_gpu_cmd_get_capset(struct virtio_gpu_device *vgdev,
 	cmd_p->capset_version = cpu_to_le32(version);
 	*cache_p = cache_ent;
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 
 	return 0;
 }
@@ -904,6 +907,7 @@ int virtio_gpu_cmd_get_edids(struct virtio_gpu_device *vgdev)
 		cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_GET_EDID);
 		cmd_p->scanout = cpu_to_le32(scanout);
 		virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+		virtio_gpu_notify(vgdev);
 	}
 
 	return 0;
@@ -924,6 +928,7 @@ void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id,
 	strncpy(cmd_p->debug_name, name, sizeof(cmd_p->debug_name) - 1);
 	cmd_p->debug_name[sizeof(cmd_p->debug_name) - 1] = 0;
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev,
@@ -938,6 +943,7 @@ void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev,
 	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_CTX_DESTROY);
 	cmd_p->hdr.ctx_id = cpu_to_le32(id);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev,
@@ -956,7 +962,7 @@ void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev,
 	cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id);
 	cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev,
@@ -975,6 +981,7 @@ void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev,
 	cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id);
 	cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+	virtio_gpu_notify(vgdev);
 }
 
 void
@@ -1006,6 +1013,8 @@ virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev,
 	cmd_p->flags = cpu_to_le32(params->flags);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
+
 	bo->created = true;
 }
 
@@ -1039,6 +1048,7 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct virtio_gpu_device *vgdev,
 	cmd_p->level = cpu_to_le32(level);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,
@@ -1065,6 +1075,7 @@ void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,
 	cmd_p->level = cpu_to_le32(level);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
@@ -1088,6 +1099,7 @@ void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
 	cmd_p->size = cpu_to_le32(data_size);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+	virtio_gpu_notify(vgdev);
 }
 
 int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
-- 
2.18.2

[PATCH v4 2/6] drm/virtio: notify before waiting

[Gerd Hoffmann]

Before we are going to wait for virtqueue entries becoming available
call virtio_gpu_notify() to make sure the host has seen everything
we've submitted.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_vq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 6cc259cfa517..653efb26bcd9 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -346,6 +346,7 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev,
 
 	if (vq->num_free < elemcnt) {
 		spin_unlock(&vgdev->ctrlq.qlock);
+		virtio_gpu_notify(vgdev);
 		wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= elemcnt);
 		goto again;
 	}
-- 
2.18.2

[PATCH v4 3/6] drm/virtio: batch plane updates (pageflip)

[Gerd Hoffmann]

Move virtio_gpu_notify() to higher-level functions for
virtio_gpu_cmd_resource_flush(), virtio_gpu_cmd_set_scanout() and
virtio_gpu_cmd_transfer_to_host_{2d,3d}().

virtio_gpu_primary_plane_update() will notify only once for a series
of commands (restores plane update command batching).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 2 ++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c   | 1 +
 drivers/gpu/drm/virtio/virtgpu_plane.c   | 3 +++
 drivers/gpu/drm/virtio/virtgpu_vq.c      | 4 ----
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index af953db4a0c9..2b7e6ae65546 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -90,6 +90,7 @@ static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 				   crtc->mode.hdisplay,
 				   crtc->mode.vdisplay, 0, 0);
+	virtio_gpu_notify(vgdev);
 }
 
 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
@@ -108,6 +109,7 @@ static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 
 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
+	virtio_gpu_notify(vgdev);
 	output->enabled = false;
 }
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 0477d1250f2d..467649733d24 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -359,6 +359,7 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
 			 args->level, &args->box, objs, fence);
 		dma_fence_put(&fence->f);
 	}
+	virtio_gpu_notify(vgdev);
 	return 0;
 
 err_unlock:
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 08b2e4127eb3..52d24179bcec 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -148,6 +148,7 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 					   plane->state->src_w >> 16,
 					   plane->state->src_h >> 16,
 					   0, 0);
+		virtio_gpu_notify(vgdev);
 		return;
 	}
 
@@ -184,6 +185,7 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 				      rect.y1,
 				      rect.x2 - rect.x1,
 				      rect.y2 - rect.y1);
+	virtio_gpu_notify(vgdev);
 }
 
 static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane,
@@ -262,6 +264,7 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 			 plane->state->crtc_w,
 			 plane->state->crtc_h,
 			 0, 0, objs, vgfb->fence);
+		virtio_gpu_notify(vgdev);
 		dma_fence_wait(&vgfb->fence->f, true);
 		dma_fence_put(&vgfb->fence->f);
 		vgfb->fence = NULL;
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 653efb26bcd9..0bd1c51bbabd 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -568,7 +568,6 @@ void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
@@ -590,7 +589,6 @@ void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
@@ -623,7 +621,6 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 static void
@@ -1049,7 +1046,6 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct virtio_gpu_device *vgdev,
 	cmd_p->level = cpu_to_le32(level);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,
-- 
2.18.2

[PATCH v4 4/6] drm/virtio: batch resource creation

[Gerd Hoffmann]

Move virtio_gpu_notify() to higher-level functions for
virtio_gpu_cmd_create_resource(), virtio_gpu_cmd_resource_create_3d()
and virtio_gpu_cmd_resource_attach_backing().

virtio_gpu_object_create() will batch commands and notify only once when
creating a resource.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 1 +
 drivers/gpu/drm/virtio/virtgpu_vq.c     | 3 ---
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index 8870ee23ff2b..65d6834d3c74 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -224,6 +224,7 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 		return ret;
 	}
 
+	virtio_gpu_notify(vgdev);
 	*bo_ptr = bo;
 	return 0;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 0bd1c51bbabd..4e9b2f2e71bd 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -515,7 +515,6 @@ void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
 	cmd_p->height = cpu_to_le32(params->height);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 	bo->created = true;
 }
 
@@ -644,7 +643,6 @@ virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev,
 	vbuf->data_size = sizeof(*ents) * nents;
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
@@ -1011,7 +1009,6 @@ virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev,
 	cmd_p->flags = cpu_to_le32(params->flags);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 
 	bo->created = true;
 }
-- 
2.18.2

[PATCH v4 5/6] drm/virtio: batch display query

[Gerd Hoffmann]

Move virtio_gpu_notify() to higher-level functions for
virtio_gpu_cmd_get_display_info() and virtio_gpu_cmd_get_edids().

virtio_gpu_config_changed_work_func() and virtio_gpu_init() will
batch commands and notify only once per update

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_kms.c | 2 ++
 drivers/gpu/drm/virtio/virtgpu_vq.c  | 2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 4009c2f97d08..8fd7acef960f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -44,6 +44,7 @@ static void virtio_gpu_config_changed_work_func(struct work_struct *work)
 		if (vgdev->has_edid)
 			virtio_gpu_cmd_get_edids(vgdev);
 		virtio_gpu_cmd_get_display_info(vgdev);
+		virtio_gpu_notify(vgdev);
 		drm_helper_hpd_irq_event(vgdev->ddev);
 		events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
 	}
@@ -205,6 +206,7 @@ int virtio_gpu_init(struct drm_device *dev)
 	if (vgdev->has_edid)
 		virtio_gpu_cmd_get_edids(vgdev);
 	virtio_gpu_cmd_get_display_info(vgdev);
+	virtio_gpu_notify(vgdev);
 	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 			   5 * HZ);
 	return 0;
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 4e9b2f2e71bd..2e108b426244 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -775,7 +775,6 @@ int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev)
 	vgdev->display_info_pending = true;
 	cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 	return 0;
 }
 
@@ -903,7 +902,6 @@ int virtio_gpu_cmd_get_edids(struct virtio_gpu_device *vgdev)
 		cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_GET_EDID);
 		cmd_p->scanout = cpu_to_le32(scanout);
 		virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-		virtio_gpu_notify(vgdev);
 	}
 
 	return 0;
-- 
2.18.2

[PATCH v4 6/6] drm/virtio: move remaining virtio_gpu_notify calls

[Gerd Hoffmann]

Move all remaining virtio_gpu_notify() calls from virtio_gpu_cmd_*
to the callers, for consistency reasons.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_gem.c    | 2 ++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c  | 3 +++
 drivers/gpu/drm/virtio/virtgpu_kms.c    | 3 +++
 drivers/gpu/drm/virtio/virtgpu_object.c | 1 +
 drivers/gpu/drm/virtio/virtgpu_vq.c     | 9 ---------
 5 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index 0a2b62279647..0d6152c99a27 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -123,6 +123,7 @@ int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 
 	virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id,
 					       objs);
+	virtio_gpu_notify(vgdev);
 	return 0;
 }
 
@@ -143,6 +144,7 @@ void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
 
 	virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id,
 					       objs);
+	virtio_gpu_notify(vgdev);
 }
 
 struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents)
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 467649733d24..bbc31aef51f1 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -158,6 +158,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 
 	virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
 			      vfpriv->ctx_id, buflist, out_fence);
+	virtio_gpu_notify(vgdev);
 	return 0;
 
 out_unresv:
@@ -314,6 +315,7 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
 		(vgdev, vfpriv->ctx_id, offset, args->level,
 		 &args->box, objs, fence);
 	dma_fence_put(&fence->f);
+	virtio_gpu_notify(vgdev);
 	return 0;
 
 err_unlock:
@@ -446,6 +448,7 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 	/* not in cache - need to talk to hw */
 	virtio_gpu_cmd_get_capset(vgdev, found_valid, args->cap_set_ver,
 				  &cache_ent);
+	virtio_gpu_notify(vgdev);
 
 copy_exit:
 	ret = wait_event_timeout(vgdev->resp_wq,
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 8fd7acef960f..ad3b673f5796 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -61,6 +61,7 @@ static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
 		return handle;
 	handle += 1;
 	virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
+	virtio_gpu_notify(vgdev);
 	return handle;
 }
 
@@ -68,6 +69,7 @@ static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
 				      uint32_t ctx_id)
 {
 	virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
+	virtio_gpu_notify(vgdev);
 	ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
 }
 
@@ -93,6 +95,7 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
 	}
 	for (i = 0; i < num_capsets; i++) {
 		virtio_gpu_cmd_get_capset_info(vgdev, i);
+		virtio_gpu_notify(vgdev);
 		ret = wait_event_timeout(vgdev->resp_wq,
 					 vgdev->capsets[i].id > 0, 5 * HZ);
 		if (ret == 0) {
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index 65d6834d3c74..3d2a6d489bfc 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -88,6 +88,7 @@ static void virtio_gpu_free_object(struct drm_gem_object *obj)
 
 	if (bo->created) {
 		virtio_gpu_cmd_unref_resource(vgdev, bo);
+		virtio_gpu_notify(vgdev);
 		/* completion handler calls virtio_gpu_cleanup_object() */
 		return;
 	}
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 2e108b426244..5e2375e0f7bb 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -544,7 +544,6 @@ void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev,
 
 	vbuf->resp_cb_data = bo;
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
@@ -798,7 +797,6 @@ int virtio_gpu_cmd_get_capset_info(struct virtio_gpu_device *vgdev, int idx)
 	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_GET_CAPSET_INFO);
 	cmd_p->capset_index = cpu_to_le32(idx);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 	return 0;
 }
 
@@ -874,7 +872,6 @@ int virtio_gpu_cmd_get_capset(struct virtio_gpu_device *vgdev,
 	cmd_p->capset_version = cpu_to_le32(version);
 	*cache_p = cache_ent;
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 
 	return 0;
 }
@@ -922,7 +919,6 @@ void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id,
 	strncpy(cmd_p->debug_name, name, sizeof(cmd_p->debug_name) - 1);
 	cmd_p->debug_name[sizeof(cmd_p->debug_name) - 1] = 0;
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev,
@@ -937,7 +933,6 @@ void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev,
 	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_CTX_DESTROY);
 	cmd_p->hdr.ctx_id = cpu_to_le32(id);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev,
@@ -956,7 +951,6 @@ void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev,
 	cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id);
 	cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev,
@@ -975,7 +969,6 @@ void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev,
 	cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id);
 	cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void
@@ -1067,7 +1060,6 @@ void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,
 	cmd_p->level = cpu_to_le32(level);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
@@ -1091,7 +1083,6 @@ void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
 	cmd_p->size = cpu_to_le32(data_size);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
-- 
2.18.2