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Gerd Hoffmann

2020-Sep-08 06:47 UTC

[PATCH] drm/virtio: drop quirks handling

These days dma ops can be overridden per device, and the virtio core
uses that to handle the dma quirks transparently for the rest of the
kernel.  So we can drop the virtio_has_dma_quirk() checks, just use
the dma api unconditionally and depend on the virtio core having setup
dma_ops as needed.

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 19 ++++++-------------
 drivers/gpu/drm/virtio/virtgpu_vq.c     | 16 ++++++----------
 2 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c
b/drivers/gpu/drm/virtio/virtgpu_object.c
index 729f98ad7c02..9c35ce64ff9e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -141,7 +141,6 @@ static int virtio_gpu_object_shmem_init(struct
virtio_gpu_device *vgdev,
 					struct virtio_gpu_mem_entry **ents,
 					unsigned int *nents)
 {
-	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
 	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 	struct scatterlist *sg;
 	int si, ret;
@@ -162,15 +161,11 @@ static int virtio_gpu_object_shmem_init(struct
virtio_gpu_device *vgdev,
 		return -EINVAL;
 	}
 
-	if (use_dma_api) {
-		shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
-					   shmem->pages->sgl,
-					   shmem->pages->nents,
-					   DMA_TO_DEVICE);
-		*nents = shmem->mapped;
-	} else {
-		*nents = shmem->pages->nents;
-	}
+	shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
+				   shmem->pages->sgl,
+				   shmem->pages->nents,
+				   DMA_TO_DEVICE);
+	*nents = shmem->mapped;
 
 	*ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
 			      GFP_KERNEL);
@@ -180,9 +175,7 @@ static int virtio_gpu_object_shmem_init(struct
virtio_gpu_device *vgdev,
 	}
 
 	for_each_sg(shmem->pages->sgl, sg, *nents, si) {
-		(*ents)[si].addr = cpu_to_le64(use_dma_api
-					       ? sg_dma_address(sg)
-					       : sg_phys(sg));
+		(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
 		(*ents)[si].length = cpu_to_le32(sg->length);
 		(*ents)[si].padding = 0;
 	}
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
index c93c2db35aaf..1c1d2834547d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -599,13 +599,11 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct
virtio_gpu_device *vgdev,
 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
 	struct virtio_gpu_transfer_to_host_2d *cmd_p;
 	struct virtio_gpu_vbuffer *vbuf;
-	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
 	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 
-	if (use_dma_api)
-		dma_sync_sg_for_device(vgdev->vdev->dev.parent,
-				       shmem->pages->sgl, shmem->pages->nents,
-				       DMA_TO_DEVICE);
+	dma_sync_sg_for_device(vgdev->vdev->dev.parent,
+			       shmem->pages->sgl, shmem->pages->nents,
+			       DMA_TO_DEVICE);
 
 	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
 	memset(cmd_p, 0, sizeof(*cmd_p));
@@ -1015,13 +1013,11 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct
virtio_gpu_device *vgdev,
 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
 	struct virtio_gpu_transfer_host_3d *cmd_p;
 	struct virtio_gpu_vbuffer *vbuf;
-	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
 	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 
-	if (use_dma_api)
-		dma_sync_sg_for_device(vgdev->vdev->dev.parent,
-				       shmem->pages->sgl, shmem->pages->nents,
-				       DMA_TO_DEVICE);
+	dma_sync_sg_for_device(vgdev->vdev->dev.parent,
+			       shmem->pages->sgl, shmem->pages->nents,
+			       DMA_TO_DEVICE);
 
 	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
 	memset(cmd_p, 0, sizeof(*cmd_p));
-- 
2.27.0

Daniel Vetter

2020-Sep-08 08:57 UTC

head link

[PATCH] drm/virtio: drop quirks handling

On Tue, Sep 08, 2020 at 08:47:41AM +0200, Gerd Hoffmann
wrote:> These days dma ops can be overridden per device, and the virtio core
"can be overridden" or "are"? The comment above
vring_use_dma_api()
suggests that's not yet done. If that's wrong then I think updating the
comment would be really good.
-Daniel
> uses that to handle the dma quirks transparently for the rest of the
> kernel.  So we can drop the virtio_has_dma_quirk() checks, just use
> the dma api unconditionally and depend on the virtio core having setup
> dma_ops as needed.
> 
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_object.c | 19 ++++++-------------
>  drivers/gpu/drm/virtio/virtgpu_vq.c     | 16 ++++++----------
>  2 files changed, 12 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c
b/drivers/gpu/drm/virtio/virtgpu_object.c
> index 729f98ad7c02..9c35ce64ff9e 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_object.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_object.c
> @@ -141,7 +141,6 @@ static int virtio_gpu_object_shmem_init(struct
virtio_gpu_device *vgdev,
>  					struct virtio_gpu_mem_entry **ents,
>  					unsigned int *nents)
>  {
> -	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
>  	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
>  	struct scatterlist *sg;
>  	int si, ret;
> @@ -162,15 +161,11 @@ static int virtio_gpu_object_shmem_init(struct
virtio_gpu_device *vgdev,
>  		return -EINVAL;
>  	}
>  
> -	if (use_dma_api) {
> -		shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
> -					   shmem->pages->sgl,
> -					   shmem->pages->nents,
> -					   DMA_TO_DEVICE);
> -		*nents = shmem->mapped;
> -	} else {
> -		*nents = shmem->pages->nents;
> -	}
> +	shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
> +				   shmem->pages->sgl,
> +				   shmem->pages->nents,
> +				   DMA_TO_DEVICE);
> +	*nents = shmem->mapped;
>  
>  	*ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
>  			      GFP_KERNEL);
> @@ -180,9 +175,7 @@ static int virtio_gpu_object_shmem_init(struct
virtio_gpu_device *vgdev,
>  	}
>  
>  	for_each_sg(shmem->pages->sgl, sg, *nents, si) {
> -		(*ents)[si].addr = cpu_to_le64(use_dma_api
> -					       ? sg_dma_address(sg)
> -					       : sg_phys(sg));
> +		(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
>  		(*ents)[si].length = cpu_to_le32(sg->length);
>  		(*ents)[si].padding = 0;
>  	}
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index c93c2db35aaf..1c1d2834547d 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -599,13 +599,11 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct
virtio_gpu_device *vgdev,
>  	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
>  	struct virtio_gpu_transfer_to_host_2d *cmd_p;
>  	struct virtio_gpu_vbuffer *vbuf;
> -	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
>  	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
>  
> -	if (use_dma_api)
> -		dma_sync_sg_for_device(vgdev->vdev->dev.parent,
> -				       shmem->pages->sgl, shmem->pages->nents,
> -				       DMA_TO_DEVICE);
> +	dma_sync_sg_for_device(vgdev->vdev->dev.parent,
> +			       shmem->pages->sgl, shmem->pages->nents,
> +			       DMA_TO_DEVICE);
>  
>  	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
>  	memset(cmd_p, 0, sizeof(*cmd_p));
> @@ -1015,13 +1013,11 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct
virtio_gpu_device *vgdev,
>  	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
>  	struct virtio_gpu_transfer_host_3d *cmd_p;
>  	struct virtio_gpu_vbuffer *vbuf;
> -	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
>  	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
>  
> -	if (use_dma_api)
> -		dma_sync_sg_for_device(vgdev->vdev->dev.parent,
> -				       shmem->pages->sgl, shmem->pages->nents,
> -				       DMA_TO_DEVICE);
> +	dma_sync_sg_for_device(vgdev->vdev->dev.parent,
> +			       shmem->pages->sgl, shmem->pages->nents,
> +			       DMA_TO_DEVICE);
>  
>  	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
>  	memset(cmd_p, 0, sizeof(*cmd_p));
> -- 
> 2.27.0
> 
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Gerd Hoffmann

2020-Sep-08 10:04 UTC

head link

[PATCH] drm/virtio: drop quirks handling

On Tue, Sep 08, 2020 at 10:57:21AM +0200, Daniel Vetter
wrote:> On Tue, Sep 08, 2020 at 08:47:41AM +0200, Gerd Hoffmann wrote:
> > These days dma ops can be overridden per device, and the virtio core
> 
> "can be overridden" or "are"?
Didn't happen yet, so scratch this one for now ...

take care,
  Gerd

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