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drm/virtio: Improve DMA API usage for shmem BOs

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DRM API requires the DRM's driver to be backed with the device that can
be used for generic DMA operations. The VirtIO-GPU device can't perform
DMA operations if it uses PCI transport because PCI device driver creates
a virtual VirtIO-GPU device that isn't associated with the PCI. Use PCI's
GPU device for the DRM's device instead of the VirtIO-GPU device and drop
DMA-related hacks from the VirtIO-GPU driver.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220630200726.1884320-8-dmitry.osipenko@collabora.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Dmitry Osipenko
2022-06-30 23:07:24 +03:00
committed by Gerd Hoffmann
parent e7fef09233
commit b5c9ed70d1
5 changed files with 32 additions and 99 deletions
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13
drivers/gpu/drm/virtio/virtgpu_vq.c
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@@ -595,11 +595,10 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
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 (virtio_gpu_is_shmem(bo) && use_dma_api)
dma_sync_sgtable_for_device(vgdev->vdev->dev.parent,
shmem->pages, DMA_TO_DEVICE);
dma_sync_sgtable_for_device(&vgdev->vdev->dev,
bo->base.sgt, DMA_TO_DEVICE);
cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
memset(cmd_p, 0, sizeof(*cmd_p));
@@ -1019,11 +1018,9 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct virtio_gpu_device *vgdev,
struct virtio_gpu_vbuffer *vbuf;
bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
if (virtio_gpu_is_shmem(bo) && use_dma_api) {
struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
dma_sync_sgtable_for_device(vgdev->vdev->dev.parent,
shmem->pages, DMA_TO_DEVICE);
}
if (virtio_gpu_is_shmem(bo) && use_dma_api)
dma_sync_sgtable_for_device(&vgdev->vdev->dev,
bo->base.sgt, DMA_TO_DEVICE);
cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
memset(cmd_p, 0, sizeof(*cmd_p));