UPSTREAM: 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 <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Gerd Hoffmann <[email protected]> (cherry picked from commit a03fb71716ee60d1d763f1f27773cbbaec1359ed) Signed-off-by: Greg Hartman <[email protected]> BUG: 139386237 Change-Id: Icab4912be0e3da5a6fd453eb42894e6a16344ad3
akeromi · Aug 19, 2019 · 688d54f · 688d54f
1 parent 8661999
commit 688d54f
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -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,