@@ -255,10 +255,39 @@ static int virtgpu_dma_buf_init_obj(struct drm_device *dev,
return ret;
}
+static const struct drm_gem_object_funcs virtgpu_gem_dma_buf_funcs = {
+ .free = virtgpu_dma_buf_free_obj,
+};
+
+static void virtgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
+{
+ struct drm_gem_object *obj = attach->importer_priv;
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+
+ if (bo->created) {
+ virtio_gpu_detach_object_fenced(bo);
+
+ if (bo->sgt)
+ dma_buf_unmap_attachment(attach, bo->sgt,
+ DMA_BIDIRECTIONAL);
+
+ bo->sgt = NULL;
+ }
+}
+
+static const struct dma_buf_attach_ops virtgpu_dma_buf_attach_ops = {
+ .allow_peer2peer = true,
+ .move_notify = virtgpu_dma_buf_move_notify
+};
+
struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
struct dma_buf *buf)
{
+ struct virtio_gpu_device *vgdev = dev->dev_private;
+ struct dma_buf_attachment *attach;
+ struct virtio_gpu_object *bo;
struct drm_gem_object *obj;
+ int ret;
if (buf->ops == &virtgpu_dmabuf_ops.ops) {
obj = buf->priv;
@@ -272,7 +301,32 @@ struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
}
}
- return drm_gem_prime_import(dev, buf);
+ if (!vgdev->has_resource_blob || vgdev->has_virgl_3d)
+ return drm_gem_prime_import(dev, buf);
+
+ bo = kzalloc(sizeof(*bo), GFP_KERNEL);
+ if (!bo)
+ return ERR_PTR(-ENOMEM);
+
+ obj = &bo->base.base;
+ obj->funcs = &virtgpu_gem_dma_buf_funcs;
+ drm_gem_private_object_init(dev, obj, buf->size);
+
+ attach = dma_buf_dynamic_attach(buf, dev->dev,
+ &virtgpu_dma_buf_attach_ops, obj);
+ if (IS_ERR(attach)) {
+ kfree(bo);
+ return ERR_CAST(attach);
+ }
+
+ obj->import_attach = attach;
+ get_dma_buf(buf);
+
+ ret = virtgpu_dma_buf_init_obj(dev, bo, attach);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ return obj;
}
struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
@@ -281,3 +335,4 @@ struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
{
return ERR_PTR(-ENODEV);
}
+
By importing scanout buffers from other devices, we should be able to use the virtio-gpu driver in KMS only mode. Note that we attach dynamically and register a move_notify() callback so that we can let the VMM know of any location changes associated with the backing store of the imported object by sending detach_backing cmd. Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Gurchetan Singh <gurchetansingh@chromium.org> Cc: Chia-I Wu <olvaffe@gmail.com> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com> --- drivers/gpu/drm/virtio/virtgpu_prime.c | 57 +++++++++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-)