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drm/virtio: support mapping exported vram

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Implement virtgpu specific map_dma_buf callback to support mapping
exported vram object dma-bufs. The dma-buf callback is used directly, as
vram objects don't have backing pages and thus can't implement the
drm_gem_object_funcs.get_sg_table callback.

Signed-off-by: David Stevens <stevensd@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20210813005441.608293-1-stevensd@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
David Stevens
2021-08-13 09:54:41 +09:00
committed by Gerd Hoffmann
parent f492283b15
commit ea5ea3d8a1
3 changed files with 99 additions and 2 deletions
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32
drivers/gpu/drm/virtio/virtgpu_prime.c
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@@ -43,13 +43,41 @@ static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
return 0;
}
static struct sg_table *
virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
if (virtio_gpu_is_vram(bo))
return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir);
return drm_gem_map_dma_buf(attach, dir);
}
static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
if (virtio_gpu_is_vram(bo)) {
virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir);
return;
}
drm_gem_unmap_dma_buf(attach, sgt, dir);
}
static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
.ops = {
.cache_sgt_mapping = true,
.attach = virtio_dma_buf_attach,
.detach = drm_gem_map_detach,
.map_dma_buf = drm_gem_map_dma_buf,
.unmap_dma_buf = drm_gem_unmap_dma_buf,
.map_dma_buf = virtgpu_gem_map_dma_buf,
.unmap_dma_buf = virtgpu_gem_unmap_dma_buf,
.release = drm_gem_dmabuf_release,
.mmap = drm_gem_dmabuf_mmap,
.vmap = drm_gem_dmabuf_vmap,