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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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8
drivers/gpu/drm/virtio/virtgpu_drv.h
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@@ -26,6 +26,7 @@
#ifndef VIRTIO_DRV_H
#define VIRTIO_DRV_H
#include <linux/dma-direction.h>
#include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
@@ -459,4 +460,11 @@ bool virtio_gpu_is_vram(struct virtio_gpu_object *bo);
int virtio_gpu_vram_create(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object_params *params,
struct virtio_gpu_object **bo_ptr);
struct sg_table *virtio_gpu_vram_map_dma_buf(struct virtio_gpu_object *bo,
struct device *dev,
enum dma_data_direction dir);
void virtio_gpu_vram_unmap_dma_buf(struct device *dev,
struct sg_table *sgt,
enum dma_data_direction dir);
#endif