[PATCH 1/2] drm/virtio: Create Dumb BOs as guest Blobs

[Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>]

If support for Blob resources is available, then dumb BOs created
by the driver can be considered as guest Blobs. And, for guest
Blobs, there is no need to do any transfers or flushes but we do
need to do set_scanout even if the FB has not changed as part of
plane updates.

Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>
---
 drivers/gpu/drm/virtio/virtgpu_gem.c    |  8 ++++++++
 drivers/gpu/drm/virtio/virtgpu_object.c |  3 +++
 drivers/gpu/drm/virtio/virtgpu_plane.c  | 18 +++++++++++-------
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index 8502400b2f9c..5f49fb1cce65 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -64,6 +64,7 @@ int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 {
 	struct drm_gem_object *gobj;
 	struct virtio_gpu_object_params params = { 0 };
+	struct virtio_gpu_device *vgdev = dev->dev_private;
 	int ret;
 	uint32_t pitch;
 
@@ -79,6 +80,13 @@ int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 	params.height = args->height;
 	params.size = args->size;
 	params.dumb = true;
+
+	if (vgdev->has_resource_blob) {
+		params.blob_mem = VIRTGPU_BLOB_MEM_GUEST;
+		params.blob_flags = VIRTGPU_BLOB_FLAG_USE_SHAREABLE;
+		params.blob = true;
+	}
+
 	ret = virtio_gpu_gem_create(file_priv, dev, &params, &gobj,
 				    &args->handle);
 	if (ret)
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index 4ff1ec28e630..f648b0e24447 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -254,6 +254,9 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 	}
 
 	if (params->blob) {
+		if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
+			bo->guest_blob = true;
+
 		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
 						    ents, nents);
 	} else if (params->virgl) {
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 4e1b17548007..3731f1a6477d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -161,10 +161,11 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 		return;
 
 	bo = gem_to_virtio_gpu_obj(plane->state->fb->obj[0]);
-	if (bo->dumb)
+	if (bo->dumb && !bo->guest_blob)
 		virtio_gpu_update_dumb_bo(vgdev, plane->state, &rect);
 
-	if (plane->state->fb != old_state->fb ||
+	if ((bo->dumb && bo->guest_blob) ||
+	    plane->state->fb != old_state->fb ||
 	    plane->state->src_w != old_state->src_w ||
 	    plane->state->src_h != old_state->src_h ||
 	    plane->state->src_x != old_state->src_x ||
@@ -198,11 +199,14 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 		}
 	}
 
-	virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle,
-				      rect.x1,
-				      rect.y1,
-				      rect.x2 - rect.x1,
-				      rect.y2 - rect.y1);
+	if (!bo->guest_blob) {
+		virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle,
+					      rect.x1,
+				              rect.y1,
+				              rect.x2 - rect.x1,
+				              rect.y2 - rect.y1);
+	}
+
 	virtio_gpu_notify(vgdev);
 }
 
-- 
2.26.2

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