thr3ads.net - Linux Virtualization - [PATCH 4/4] drm/virtio: move virtio_gpu_mem_entry initialization to new function [Feb 2020]

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Gerd Hoffmann

2020-Feb-05 10:59 UTC

[PATCH 4/4] drm/virtio: move virtio_gpu_mem_entry initialization to new function

Introduce new virtio_gpu_object_shmem_init() helper function which will
create the virtio_gpu_mem_entry array, containing the backing storage
information for the host.  For the most path this just moves code from
virtio_gpu_object_attach().

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h    |  4 ++
 drivers/gpu/drm/virtio/virtgpu_object.c | 49 +++++++++++++++++++++++++
 drivers/gpu/drm/virtio/virtgpu_vq.c     | 49 ++-----------------------
 3 files changed, 56 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h
b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 15fb3c12f22f..be62a7469b04 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -71,6 +71,10 @@ struct virtio_gpu_object {
 
 	struct sg_table *pages;
 	uint32_t mapped;
+
+	struct virtio_gpu_mem_entry *ents;
+	unsigned int nents;
+
 	bool dumb;
 	bool created;
 };
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c
b/drivers/gpu/drm/virtio/virtgpu_object.c
index bce2b3d843fe..4e82e269a1f4 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -121,6 +121,49 @@ struct drm_gem_object *virtio_gpu_create_object(struct
drm_device *dev,
 	return &bo->base.base;
 }
 
+static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
+					struct virtio_gpu_object *bo)
+{
+	bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
+	struct scatterlist *sg;
+	int si, ret;
+
+	ret = drm_gem_shmem_pin(&bo->base.base);
+	if (ret < 0)
+		return -EINVAL;
+
+	bo->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
+	if (bo->pages == NULL) {
+		drm_gem_shmem_unpin(&bo->base.base);
+		return -EINVAL;
+	}
+
+	if (use_dma_api) {
+		bo->mapped = dma_map_sg(vgdev->vdev->dev.parent,
+					 bo->pages->sgl, bo->pages->nents,
+					 DMA_TO_DEVICE);
+		bo->nents = bo->mapped;
+	} else {
+		bo->nents = bo->pages->nents;
+	}
+
+	bo->ents = kmalloc_array(bo->nents, sizeof(struct virtio_gpu_mem_entry),
+				 GFP_KERNEL);
+	if (!bo->ents) {
+		DRM_ERROR("failed to allocate ent list\n");
+		return -ENOMEM;
+	}
+
+	for_each_sg(bo->pages->sgl, sg, bo->nents, si) {
+		bo->ents[si].addr = cpu_to_le64(use_dma_api
+						? sg_dma_address(sg)
+						: sg_phys(sg));
+		bo->ents[si].length = cpu_to_le32(sg->length);
+		bo->ents[si].padding = 0;
+	}
+	return 0;
+}
+
 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 			     struct virtio_gpu_object_params *params,
 			     struct virtio_gpu_object **bo_ptr,
@@ -165,6 +208,12 @@ int virtio_gpu_object_create(struct virtio_gpu_device
*vgdev,
 					       objs, fence);
 	}
 
+	ret = virtio_gpu_object_shmem_init(vgdev, bo);
+	if (ret != 0) {
+		virtio_gpu_free_object(&shmem_obj->base);
+		return ret;
+	}
+
 	ret = virtio_gpu_object_attach(vgdev, bo, NULL);
 	if (ret != 0) {
 		virtio_gpu_free_object(&shmem_obj->base);
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
index e258186bedb2..7db91376f2f2 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -1081,54 +1081,11 @@ int virtio_gpu_object_attach(struct virtio_gpu_device
*vgdev,
 			     struct virtio_gpu_object *obj,
 			     struct virtio_gpu_fence *fence)
 {
-	bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
-	struct virtio_gpu_mem_entry *ents;
-	struct scatterlist *sg;
-	int si, nents, ret;
-
-	if (WARN_ON_ONCE(!obj->created))
-		return -EINVAL;
-	if (WARN_ON_ONCE(obj->pages))
-		return -EINVAL;
-
-	ret = drm_gem_shmem_pin(&obj->base.base);
-	if (ret < 0)
-		return -EINVAL;
-
-	obj->pages = drm_gem_shmem_get_sg_table(&obj->base.base);
-	if (obj->pages == NULL) {
-		drm_gem_shmem_unpin(&obj->base.base);
-		return -EINVAL;
-	}
-
-	if (use_dma_api) {
-		obj->mapped = dma_map_sg(vgdev->vdev->dev.parent,
-					 obj->pages->sgl, obj->pages->nents,
-					 DMA_TO_DEVICE);
-		nents = obj->mapped;
-	} else {
-		nents = obj->pages->nents;
-	}
-
-	/* gets freed when the ring has consumed it */
-	ents = kmalloc_array(nents, sizeof(struct virtio_gpu_mem_entry),
-			     GFP_KERNEL);
-	if (!ents) {
-		DRM_ERROR("failed to allocate ent list\n");
-		return -ENOMEM;
-	}
-
-	for_each_sg(obj->pages->sgl, sg, nents, si) {
-		ents[si].addr = cpu_to_le64(use_dma_api
-					    ? sg_dma_address(sg)
-					    : sg_phys(sg));
-		ents[si].length = cpu_to_le32(sg->length);
-		ents[si].padding = 0;
-	}
-
 	virtio_gpu_cmd_resource_attach_backing(vgdev, obj->hw_res_handle,
-					       ents, nents,
+					       obj->ents, obj->nents,
 					       fence);
+	obj->ents = NULL;
+	obj->nents = 0;
 	return 0;
 }
 
-- 
2.18.1

Chia-I Wu

2020-Feb-05 19:57 UTC

head link

[PATCH 4/4] drm/virtio: move virtio_gpu_mem_entry initialization to new function

On Wed, Feb 5, 2020 at 3:00 AM Gerd Hoffmann <kraxel at redhat.com>
wrote:>
> Introduce new virtio_gpu_object_shmem_init() helper function which will
> create the virtio_gpu_mem_entry array, containing the backing storage
> information for the host.  For the most path this just moves code from
> virtio_gpu_object_attach().
>
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_drv.h    |  4 ++
>  drivers/gpu/drm/virtio/virtgpu_object.c | 49 +++++++++++++++++++++++++
>  drivers/gpu/drm/virtio/virtgpu_vq.c     | 49 ++-----------------------
>  3 files changed, 56 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h
b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index 15fb3c12f22f..be62a7469b04 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -71,6 +71,10 @@ struct virtio_gpu_object {
>
>         struct sg_table *pages;
>         uint32_t mapped;
> +
> +       struct virtio_gpu_mem_entry *ents;
> +       unsigned int nents;
> +
>         bool dumb;
>         bool created;
>  };
> diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c
b/drivers/gpu/drm/virtio/virtgpu_object.c
> index bce2b3d843fe..4e82e269a1f4 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_object.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_object.c
> @@ -121,6 +121,49 @@ struct drm_gem_object *virtio_gpu_create_object(struct
drm_device *dev,
>         return &bo->base.base;
>  }
>
> +static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
> +                                       struct virtio_gpu_object *bo)
> +{
> +       bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
> +       struct scatterlist *sg;
> +       int si, ret;
> +
> +       ret = drm_gem_shmem_pin(&bo->base.base);
> +       if (ret < 0)
> +               return -EINVAL;
> +
> +       bo->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
> +       if (bo->pages == NULL) {
> +               drm_gem_shmem_unpin(&bo->base.base);
> +               return -EINVAL;
> +       }
> +
> +       if (use_dma_api) {
> +               bo->mapped = dma_map_sg(vgdev->vdev->dev.parent,
> +                                        bo->pages->sgl,
bo->pages->nents,
> +                                        DMA_TO_DEVICE);
> +               bo->nents = bo->mapped;
> +       } else {
> +               bo->nents = bo->pages->nents;
> +       }
> +
> +       bo->ents = kmalloc_array(bo->nents, sizeof(struct
virtio_gpu_mem_entry),
> +                                GFP_KERNEL);
> +       if (!bo->ents) {
> +               DRM_ERROR("failed to allocate ent list\n");
> +               return -ENOMEM;
> +       }
> +
> +       for_each_sg(bo->pages->sgl, sg, bo->nents, si) {
> +               bo->ents[si].addr = cpu_to_le64(use_dma_api
> +                                               ? sg_dma_address(sg)
> +                                               : sg_phys(sg));
> +               bo->ents[si].length = cpu_to_le32(sg->length);
> +               bo->ents[si].padding = 0;
> +       }
> +       return 0;
> +}
> +
>  int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>                              struct virtio_gpu_object_params *params,
>                              struct virtio_gpu_object **bo_ptr,
> @@ -165,6 +208,12 @@ int virtio_gpu_object_create(struct virtio_gpu_device
*vgdev,
>                                                objs, fence);
>         }
>
> +       ret = virtio_gpu_object_shmem_init(vgdev, bo);
> +       if (ret != 0) {
> +               virtio_gpu_free_object(&shmem_obj->base);
> +               return ret;
> +       }
> +
>         ret = virtio_gpu_object_attach(vgdev, bo, NULL);
>         if (ret != 0) {
>                 virtio_gpu_free_object(&shmem_obj->base);
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index e258186bedb2..7db91376f2f2 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -1081,54 +1081,11 @@ int virtio_gpu_object_attach(struct
virtio_gpu_device *vgdev,
>                              struct virtio_gpu_object *obj,
>                              struct virtio_gpu_fence *fence)
>  {
> -       bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
> -       struct virtio_gpu_mem_entry *ents;
> -       struct scatterlist *sg;
> -       int si, nents, ret;
> -
> -       if (WARN_ON_ONCE(!obj->created))
> -               return -EINVAL;
> -       if (WARN_ON_ONCE(obj->pages))
> -               return -EINVAL;
> -
> -       ret = drm_gem_shmem_pin(&obj->base.base);
> -       if (ret < 0)
> -               return -EINVAL;
> -
> -       obj->pages = drm_gem_shmem_get_sg_table(&obj->base.base);
> -       if (obj->pages == NULL) {
> -               drm_gem_shmem_unpin(&obj->base.base);
> -               return -EINVAL;
> -       }
> -
> -       if (use_dma_api) {
> -               obj->mapped = dma_map_sg(vgdev->vdev->dev.parent,
> -                                        obj->pages->sgl,
obj->pages->nents,
> -                                        DMA_TO_DEVICE);
> -               nents = obj->mapped;
> -       } else {
> -               nents = obj->pages->nents;
> -       }
> -
> -       /* gets freed when the ring has consumed it */
> -       ents = kmalloc_array(nents, sizeof(struct virtio_gpu_mem_entry),
> -                            GFP_KERNEL);
> -       if (!ents) {
> -               DRM_ERROR("failed to allocate ent list\n");
> -               return -ENOMEM;
> -       }
> -
> -       for_each_sg(obj->pages->sgl, sg, nents, si) {
> -               ents[si].addr = cpu_to_le64(use_dma_api
> -                                           ? sg_dma_address(sg)
> -                                           : sg_phys(sg));
> -               ents[si].length = cpu_to_le32(sg->length);
> -               ents[si].padding = 0;
> -       }
> -
>         virtio_gpu_cmd_resource_attach_backing(vgdev,
obj->hw_res_handle,
> -                                              ents, nents,
> +                                              obj->ents, obj->nents,
>                                                fence);
> +       obj->ents = NULL;
> +       obj->nents = 0;Hm, if the entries are temporary, can we allocate and initialize them
in this function?

virtio_gpu_object_shmem_init will just pin and map pages.  Maybe
rename it to virtio_gpu_object_pin_pages (and add a helper
virtio_gpu_object_unpin_pages for use by virtio_gpu_cleanup_object).

Because we pin pages on object creation, virtio_gpu_gem_funcs does not
need to provide the optional pin/unpin hooks.
>         return 0;
>  }
>
> --
> 2.18.1
>

Gerd Hoffmann

2020-Feb-06 08:55 UTC

head link

[PATCH 4/4] drm/virtio: move virtio_gpu_mem_entry initialization to new function

Hi,
> >         virtio_gpu_cmd_resource_attach_backing(vgdev,
obj->hw_res_handle,
> > -                                              ents, nents,
> > +                                              obj->ents,
obj->nents,
> >                                                fence);
> > +       obj->ents = NULL;
> > +       obj->nents = 0;
> Hm, if the entries are temporary, can we allocate and initialize them
> in this function?
Well, the plan for CREATE_RESOURCE_BLOB is to use obj->ents too ...

cheers,
  Gerd

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