1 files changed, 180 insertions, 1 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
index 44425f20d91a..fe6a0b018571 100644
--- a/drivers/gpu/drm/virtio/virtgpu_prime.c
+++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -27,6 +27,8 @@
 
 #include "virtgpu_drv.h"
 
+MODULE_IMPORT_NS("DMA_BUF");
+
 static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
 				   uuid_t *uuid)
 {
@@ -142,10 +144,162 @@ struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
 	return buf;
 }
 
+int virtgpu_dma_buf_import_sgt(struct virtio_gpu_mem_entry **ents,
+			       unsigned int *nents,
+			       struct virtio_gpu_object *bo,
+			       struct dma_buf_attachment *attach)
+{
+	struct scatterlist *sl;
+	struct sg_table *sgt;
+	long i, ret;
+
+	dma_resv_assert_held(attach->dmabuf->resv);
+
+	ret = dma_resv_wait_timeout(attach->dmabuf->resv,
+				    DMA_RESV_USAGE_KERNEL,
+				    false, MAX_SCHEDULE_TIMEOUT);
+	if (ret <= 0)
+		return ret < 0 ? ret : -ETIMEDOUT;
+
+	sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+	if (IS_ERR(sgt))
+		return PTR_ERR(sgt);
+
+	*ents = kvmalloc_array(sgt->nents,
+			       sizeof(struct virtio_gpu_mem_entry),
+			       GFP_KERNEL);
+	if (!(*ents)) {
+		dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
+		return -ENOMEM;
+	}
+
+	*nents = sgt->nents;
+	for_each_sgtable_dma_sg(sgt, sl, i) {
+		(*ents)[i].addr = cpu_to_le64(sg_dma_address(sl));
+		(*ents)[i].length = cpu_to_le32(sg_dma_len(sl));
+		(*ents)[i].padding = 0;
+	}
+
+	bo->sgt = sgt;
+	return 0;
+}
+
+static void virtgpu_dma_buf_unmap(struct virtio_gpu_object *bo)
+{
+	struct dma_buf_attachment *attach = bo->base.base.import_attach;
+
+	dma_resv_assert_held(attach->dmabuf->resv);
+
+	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 void virtgpu_dma_buf_free_obj(struct drm_gem_object *obj)
+{
+	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
+	struct dma_buf_attachment *attach = obj->import_attach;
+
+	if (attach) {
+		struct dma_buf *dmabuf = attach->dmabuf;
+
+		dma_resv_lock(dmabuf->resv, NULL);
+		virtgpu_dma_buf_unmap(bo);
+		dma_resv_unlock(dmabuf->resv);
+
+		dma_buf_detach(dmabuf, attach);
+		dma_buf_put(dmabuf);
+	}
+
+	if (bo->created) {
+		virtio_gpu_cmd_unref_resource(vgdev, bo);
+		virtio_gpu_notify(vgdev);
+		return;
+	}
+	virtio_gpu_cleanup_object(bo);
+}
+
+static int virtgpu_dma_buf_init_obj(struct drm_device *dev,
+				    struct virtio_gpu_object *bo,
+				    struct dma_buf_attachment *attach)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_object_params params = { 0 };
+	struct dma_resv *resv = attach->dmabuf->resv;
+	struct virtio_gpu_mem_entry *ents = NULL;
+	unsigned int nents;
+	int ret;
+
+	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
+	if (ret) {
+		virtgpu_dma_buf_free_obj(&bo->base.base);
+		return ret;
+	}
+
+	dma_resv_lock(resv, NULL);
+
+	ret = dma_buf_pin(attach);
+	if (ret)
+		goto err_pin;
+
+	ret = virtgpu_dma_buf_import_sgt(&ents, &nents, bo, attach);
+	if (ret)
+		goto err_import;
+
+	params.blob = true;
+	params.blob_mem = VIRTGPU_BLOB_MEM_GUEST;
+	params.blob_flags = VIRTGPU_BLOB_FLAG_USE_SHAREABLE;
+	params.size = attach->dmabuf->size;
+
+	virtio_gpu_cmd_resource_create_blob(vgdev, bo, &params,
+					    ents, nents);
+	bo->guest_blob = true;
+
+	dma_buf_unpin(attach);
+	dma_resv_unlock(resv);
+
+	return 0;
+
+err_import:
+	dma_buf_unpin(attach);
+err_pin:
+	dma_resv_unlock(resv);
+	virtgpu_dma_buf_free_obj(&bo->base.base);
+	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);
+
+	virtgpu_dma_buf_unmap(bo);
+}
+
+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;
@@ -159,7 +313,32 @@ 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(