Merge tag 'v6.14-rc4' into next

Sync up with the mainline.

8 files changed, 369 insertions, 48 deletions

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
index ffca6e2e1c9a..6a67c6297d58 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -32,9 +32,9 @@
 #include <linux/poll.h>
 #include <linux/wait.h>
 
+#include <drm/clients/drm_client_setup.h>
 #include <drm/drm.h>
 #include <drm/drm_atomic_helper.h>
-#include <drm/drm_client_setup.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_shmem.h>
 #include <drm/drm_file.h>
@@ -184,7 +184,6 @@ static const struct drm_driver driver = {
 	.postclose = virtio_gpu_driver_postclose,
 
 	.dumb_create = virtio_gpu_mode_dumb_create,
-	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
 
 	DRM_FBDEV_SHMEM_DRIVER_OPS,
 
@@ -202,7 +201,6 @@ static const struct drm_driver driver = {
 
 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
-	.date = DRIVER_DATE,
 	.major = DRIVER_MAJOR,
 	.minor = DRIVER_MINOR,
 	.patchlevel = DRIVER_PATCHLEVEL,
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 64c236169db8..f42ca9d8ed10 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -45,7 +45,6 @@
 
 #define DRIVER_NAME "virtio_gpu"
 #define DRIVER_DESC "virtio GPU"
-#define DRIVER_DATE "0"
 
 #define DRIVER_MAJOR 0
 #define DRIVER_MINOR 1
@@ -89,9 +88,11 @@ struct virtio_gpu_object_params {
 
 struct virtio_gpu_object {
 	struct drm_gem_shmem_object base;
+	struct sg_table *sgt;
 	uint32_t hw_res_handle;
 	bool dumb;
 	bool created;
+	bool attached;
 	bool host3d_blob, guest_blob;
 	uint32_t blob_mem, blob_flags;
 
@@ -194,6 +195,13 @@ struct virtio_gpu_framebuffer {
 #define to_virtio_gpu_framebuffer(x) \
 	container_of(x, struct virtio_gpu_framebuffer, base)
 
+struct virtio_gpu_plane_state {
+	struct drm_plane_state base;
+	struct virtio_gpu_fence *fence;
+};
+#define to_virtio_gpu_plane_state(x) \
+	container_of(x, struct virtio_gpu_plane_state, base)
+
 struct virtio_gpu_queue {
 	struct virtqueue *vq;
 	spinlock_t qlock;
@@ -301,9 +309,6 @@ void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
 int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 				struct drm_device *dev,
 				struct drm_mode_create_dumb *args);
-int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
-			      struct drm_device *dev,
-			      uint32_t handle, uint64_t *offset_p);
 
 struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents);
 struct virtio_gpu_object_array*
@@ -349,6 +354,10 @@ void virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
 			      struct virtio_gpu_object *obj,
 			      struct virtio_gpu_mem_entry *ents,
 			      unsigned int nents);
+void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
+			      struct virtio_gpu_object *obj,
+			      struct virtio_gpu_fence *fence);
+int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo);
 void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
 			    struct virtio_gpu_output *output);
 int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev);
@@ -468,6 +477,10 @@ struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
 	struct drm_device *dev, struct dma_buf_attachment *attach,
 	struct sg_table *sgt);
+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);
 
 /* virtgpu_debugfs.c */
 void virtio_gpu_debugfs_init(struct drm_minor *minor);
diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index 7db48d17ee3a..5aab588fc400 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -99,21 +99,6 @@ fail:
 	return ret;
 }
 
-int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
-			      struct drm_device *dev,
-			      uint32_t handle, uint64_t *offset_p)
-{
-	struct drm_gem_object *gobj;
-
-	BUG_ON(!offset_p);
-	gobj = drm_gem_object_lookup(file_priv, handle);
-	if (gobj == NULL)
-		return -ENOENT;
-	*offset_p = drm_vma_node_offset_addr(&gobj->vma_node);
-	drm_gem_object_put(gobj);
-	return 0;
-}
-
 int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 			       struct drm_file *file)
 {
@@ -127,15 +112,17 @@ int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 	/* the context might still be missing when the first ioctl is
 	 * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
 	 */
-	virtio_gpu_create_context(obj->dev, file);
+	if (!vgdev->has_context_init)
+		virtio_gpu_create_context(obj->dev, file);
 
 	objs = virtio_gpu_array_alloc(1);
 	if (!objs)
 		return -ENOMEM;
 	virtio_gpu_array_add_obj(objs, obj);
 
-	virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id,
-					       objs);
+	if (vfpriv->ctx_id)
+		virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id, objs);
+
 out_notify:
 	virtio_gpu_notify(vgdev);
 	return 0;
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index e4f76f315550..c33c057365f8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -80,9 +80,9 @@ static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct drm_virtgpu_map *virtio_gpu_map = data;
 
-	return virtio_gpu_mode_dumb_mmap(file, vgdev->ddev,
-					 virtio_gpu_map->handle,
-					 &virtio_gpu_map->offset);
+	return drm_gem_dumb_map_offset(file, vgdev->ddev,
+				       virtio_gpu_map->handle,
+				       &virtio_gpu_map->offset);
 }
 
 static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index c7e74cf13022..5517cff8715c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -80,6 +80,9 @@ void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
 		drm_gem_free_mmap_offset(&vram->base.base.base);
 		drm_gem_object_release(&vram->base.base.base);
 		kfree(vram);
+	} else {
+		drm_gem_object_release(&bo->base.base);
+		kfree(bo);
 	}
 }
 
@@ -97,6 +100,27 @@ static void virtio_gpu_free_object(struct drm_gem_object *obj)
 	virtio_gpu_cleanup_object(bo);
 }
 
+int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo)
+{
+	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
+	struct virtio_gpu_fence *fence;
+
+	if (!bo->attached)
+		return 0;
+
+	fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
+	if (!fence)
+		return -ENOMEM;
+
+	virtio_gpu_object_detach(vgdev, bo, fence);
+	virtio_gpu_notify(vgdev);
+
+	dma_fence_wait(&fence->f, false);
+	dma_fence_put(&fence->f);
+
+	return 0;
+}
+
 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 	.free = virtio_gpu_free_object,
 	.open = virtio_gpu_gem_object_open,
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index a72a2dbda031..42aa554eca9f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -26,6 +26,8 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_damage_helper.h>
 #include <drm/drm_fourcc.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <linux/virtio_dma_buf.h>
 
 #include "virtgpu_drv.h"
 
@@ -66,11 +68,28 @@ uint32_t virtio_gpu_translate_format(uint32_t drm_fourcc)
 	return format;
 }
 
+static struct
+drm_plane_state *virtio_gpu_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct virtio_gpu_plane_state *new;
+
+	if (WARN_ON(!plane->state))
+		return NULL;
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	__drm_atomic_helper_plane_duplicate_state(plane, &new->base);
+
+	return &new->base;
+}
+
 static const struct drm_plane_funcs virtio_gpu_plane_funcs = {
 	.update_plane		= drm_atomic_helper_update_plane,
 	.disable_plane		= drm_atomic_helper_disable_plane,
 	.reset			= drm_atomic_helper_plane_reset,
-	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_duplicate_state = virtio_gpu_plane_duplicate_state,
 	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
 };
 
@@ -138,11 +157,13 @@ static void virtio_gpu_resource_flush(struct drm_plane *plane,
 	struct drm_device *dev = plane->dev;
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_framebuffer *vgfb;
+	struct virtio_gpu_plane_state *vgplane_st;
 	struct virtio_gpu_object *bo;
 
 	vgfb = to_virtio_gpu_framebuffer(plane->state->fb);
+	vgplane_st = to_virtio_gpu_plane_state(plane->state);
 	bo = gem_to_virtio_gpu_obj(vgfb->base.obj[0]);
-	if (vgfb->fence) {
+	if (vgplane_st->fence) {
 		struct virtio_gpu_object_array *objs;
 
 		objs = virtio_gpu_array_alloc(1);
@@ -151,13 +172,11 @@ static void virtio_gpu_resource_flush(struct drm_plane *plane,
 		virtio_gpu_array_add_obj(objs, vgfb->base.obj[0]);
 		virtio_gpu_array_lock_resv(objs);
 		virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle, x, y,
-					      width, height, objs, vgfb->fence);
+					      width, height, objs,
+					      vgplane_st->fence);
 		virtio_gpu_notify(vgdev);
-
-		dma_fence_wait_timeout(&vgfb->fence->f, true,
+		dma_fence_wait_timeout(&vgplane_st->fence->f, true,
 				       msecs_to_jiffies(50));
-		dma_fence_put(&vgfb->fence->f);
-		vgfb->fence = NULL;
 	} else {
 		virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle, x, y,
 					      width, height, NULL, NULL);
@@ -241,45 +260,113 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 				  rect.y2 - rect.y1);
 }
 
+static int virtio_gpu_prepare_imported_obj(struct drm_plane *plane,
+					   struct drm_plane_state *new_state,
+					   struct drm_gem_object *obj)
+{
+	struct virtio_gpu_device *vgdev = plane->dev->dev_private;
+	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+	struct dma_buf_attachment *attach = obj->import_attach;
+	struct dma_resv *resv = attach->dmabuf->resv;
+	struct virtio_gpu_mem_entry *ents = NULL;
+	unsigned int nents;
+	int ret;
+
+	dma_resv_lock(resv, NULL);
+
+	ret = dma_buf_pin(attach);
+	if (ret) {
+		dma_resv_unlock(resv);
+		return ret;
+	}
+
+	if (!bo->sgt) {
+		ret = virtgpu_dma_buf_import_sgt(&ents, &nents,
+						 bo, attach);
+		if (ret)
+			goto err;
+
+		virtio_gpu_object_attach(vgdev, bo, ents, nents);
+	}
+
+	dma_resv_unlock(resv);
+	return 0;
+
+err:
+	dma_buf_unpin(attach);
+	dma_resv_unlock(resv);
+	return ret;
+}
+
 static int virtio_gpu_plane_prepare_fb(struct drm_plane *plane,
 				       struct drm_plane_state *new_state)
 {
 	struct drm_device *dev = plane->dev;
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_framebuffer *vgfb;
+	struct virtio_gpu_plane_state *vgplane_st;
 	struct virtio_gpu_object *bo;
+	struct drm_gem_object *obj;
+	int ret;
 
 	if (!new_state->fb)
 		return 0;
 
 	vgfb = to_virtio_gpu_framebuffer(new_state->fb);
+	vgplane_st = to_virtio_gpu_plane_state(new_state);
 	bo = gem_to_virtio_gpu_obj(vgfb->base.obj[0]);
+
+	drm_gem_plane_helper_prepare_fb(plane, new_state);
+
 	if (!bo || (plane->type == DRM_PLANE_TYPE_PRIMARY && !bo->guest_blob))
 		return 0;
 
-	if (bo->dumb && (plane->state->fb != new_state->fb)) {
-		vgfb->fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context,
+	obj = new_state->fb->obj[0];
+	if (obj->import_attach) {
+		ret = virtio_gpu_prepare_imported_obj(plane, new_state, obj);
+		if (ret)
+			return ret;
+	}
+
+	if (bo->dumb || obj->import_attach) {
+		vgplane_st->fence = virtio_gpu_fence_alloc(vgdev,
+						     vgdev->fence_drv.context,
 						     0);
-		if (!vgfb->fence)
+		if (!vgplane_st->fence)
 			return -ENOMEM;
 	}
 
 	return 0;
 }
 
+static void virtio_gpu_cleanup_imported_obj(struct drm_gem_object *obj)
+{
+	struct dma_buf_attachment *attach = obj->import_attach;
+	struct dma_resv *resv = attach->dmabuf->resv;
+
+	dma_resv_lock(resv, NULL);
+	dma_buf_unpin(attach);
+	dma_resv_unlock(resv);
+}
+
 static void virtio_gpu_plane_cleanup_fb(struct drm_plane *plane,
 					struct drm_plane_state *state)
 {
-	struct virtio_gpu_framebuffer *vgfb;
+	struct virtio_gpu_plane_state *vgplane_st;
+	struct drm_gem_object *obj;
 
 	if (!state->fb)
 		return;
 
-	vgfb = to_virtio_gpu_framebuffer(state->fb);
-	if (vgfb->fence) {
-		dma_fence_put(&vgfb->fence->f);
-		vgfb->fence = NULL;
+	vgplane_st = to_virtio_gpu_plane_state(state);
+	if (vgplane_st->fence) {
+		dma_fence_put(&vgplane_st->fence->f);
+		vgplane_st->fence = NULL;
 	}
+
+	obj = state->fb->obj[0];
+	if (obj->import_attach)
+		virtio_gpu_cleanup_imported_obj(obj);
 }
 
 static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
@@ -291,6 +378,7 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_output *output = NULL;
 	struct virtio_gpu_framebuffer *vgfb;
+	struct virtio_gpu_plane_state *vgplane_st;
 	struct virtio_gpu_object *bo = NULL;
 	uint32_t handle;
 
@@ -303,6 +391,7 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 
 	if (plane->state->fb) {
 		vgfb = to_virtio_gpu_framebuffer(plane->state->fb);
+		vgplane_st = to_virtio_gpu_plane_state(plane->state);
 		bo = gem_to_virtio_gpu_obj(vgfb->base.obj[0]);
 		handle = bo->hw_res_handle;
 	} else {
@@ -322,11 +411,9 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 			(vgdev, 0,
 			 plane->state->crtc_w,
 			 plane->state->crtc_h,
-			 0, 0, objs, vgfb->fence);
+			 0, 0, objs, vgplane_st->fence);
 		virtio_gpu_notify(vgdev);
-		dma_fence_wait(&vgfb->fence->f, true);
-		dma_fence_put(&vgfb->fence->f);
-		vgfb->fence = NULL;
+		dma_fence_wait(&vgplane_st->fence->f, true);
 	}
 
 	if (plane->state->fb != old_state->fb) {
diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
index 44425f20d91a..f92133a01195 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 +144,160 @@ 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_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);
+
+		virtio_gpu_detach_object_fenced(bo);
+
+		if (bo->sgt)
+			dma_buf_unmap_attachment(attach, bo->sgt,
+						 DMA_BIDIRECTIONAL);
+
+		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;
+	bo->attached = 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);
+
+	if (bo->created && kref_read(&obj->refcount)) {
+		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;
@@ -159,7 +311,32 @@ 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(
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 0d3d0d09f39b..ad91624df42d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -645,6 +645,23 @@ virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev,
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
 }
 
+static void
+virtio_gpu_cmd_resource_detach_backing(struct virtio_gpu_device *vgdev,
+				       uint32_t resource_id,
+				       struct virtio_gpu_fence *fence)
+{
+	struct virtio_gpu_resource_detach_backing *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING);
+	cmd_p->resource_id = cpu_to_le32(resource_id);
+
+	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+}
+
 static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
 					       struct virtio_gpu_vbuffer *vbuf)
 {
@@ -1103,8 +1120,26 @@ void virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
 			      struct virtio_gpu_mem_entry *ents,
 			      unsigned int nents)
 {
+	if (obj->attached)
+		return;
+
 	virtio_gpu_cmd_resource_attach_backing(vgdev, obj->hw_res_handle,
 					       ents, nents, NULL);
+
+	obj->attached = true;
+}
+
+void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
+			      struct virtio_gpu_object *obj,
+			      struct virtio_gpu_fence *fence)
+{
+	if (!obj->attached)
+		return;
+
+	virtio_gpu_cmd_resource_detach_backing(vgdev, obj->hw_res_handle,
+					       fence);
+
+	obj->attached = false;
 }
 
 void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,