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virtio: Support prime objects vmap/vunmap 

Implement vmap/vunmap so we can export dmabufs to
other drivers, such as video4linux.

Tested with a virtio-gpu / vivid (virtual capture driver)
pipeline, where the vivid driver imports the dmabufs exported
by virtio-gpu.

Note that dma_buf_vmap() does its own vmap counting, so
it's not needed to take care of it in the driver.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180925161606.17980-4-ezequiel@collabora.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Ezequiel Garcia 2018-09-25 18:16:06 +02:00 committed by Gerd Hoffmann
parent a20c4173c4
commit a03fb71716
1 changed files with 8 additions and 3 deletions
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11
drivers/gpu/drm/virtio/virtgpu_prime.c
View File

@ -55,13 +55,18 @@ struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
{
WARN_ONCE(1, "not implemented");
return ERR_PTR(-ENODEV);
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
int ret;
ret = virtio_gpu_object_kmap(bo);
if (ret)
return NULL;
return bo->vmap;
}
void virtgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
WARN_ONCE(1, "not implemented");
virtio_gpu_object_kunmap(gem_to_virtio_gpu_obj(obj));
}
int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,