688  * calls attach() of dma_buf_ops to allow device-specific attach functionality
689  * @dmabuf:		[in]	buffer to attach device to.
711 	struct dma_buf_attachment *attach;  in dma_buf_dynamic_attach()  local
720 	attach = kzalloc(sizeof(*attach), GFP_KERNEL);  in dma_buf_dynamic_attach()
721 	if (!attach)  in dma_buf_dynamic_attach()
724 	attach->dev = dev;  in dma_buf_dynamic_attach()
725 	attach->dmabuf = dmabuf;  in dma_buf_dynamic_attach()
727 		attach->peer2peer = importer_ops->allow_peer2peer;  in dma_buf_dynamic_attach()
728 	attach->importer_ops = importer_ops;  in dma_buf_dynamic_attach()
729 	attach->importer_priv = importer_priv;  in dma_buf_dynamic_attach()
731 	if (dmabuf->ops->attach) {  in dma_buf_dynamic_attach()
732 		ret = dmabuf->ops->attach(dmabuf, attach);  in dma_buf_dynamic_attach()
737 	list_add(&attach->node, &dmabuf->attachments);  in dma_buf_dynamic_attach()
744 	if (dma_buf_attachment_is_dynamic(attach) !=  in dma_buf_dynamic_attach()
748 		if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_dynamic_attach()
749 			dma_resv_lock(attach->dmabuf->resv, NULL);  in dma_buf_dynamic_attach()
750 			ret = dma_buf_pin(attach);  in dma_buf_dynamic_attach()
755 		sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL);  in dma_buf_dynamic_attach()
762 		if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
763 			dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_dynamic_attach()
764 		attach->sgt = sgt;  in dma_buf_dynamic_attach()
765 		attach->dir = DMA_BIDIRECTIONAL;  in dma_buf_dynamic_attach()
768 	return attach;  in dma_buf_dynamic_attach()
771 	kfree(attach);  in dma_buf_dynamic_attach()
775 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
776 		dma_buf_unpin(attach);  in dma_buf_dynamic_attach()
779 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
780 		dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_dynamic_attach()
782 	dma_buf_detach(dmabuf, attach);  in dma_buf_dynamic_attach()
789  * @dmabuf:	[in]	buffer to attach device to.
806  * @attach:	[in]	attachment to be detached; is free'd after this call.
810 void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)  in dma_buf_detach()  argument
812 	if (WARN_ON(!dmabuf || !attach))  in dma_buf_detach()
815 	if (attach->sgt) {  in dma_buf_detach()
816 		if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_detach()
817 			dma_resv_lock(attach->dmabuf->resv, NULL);  in dma_buf_detach()
819 		dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);  in dma_buf_detach()
821 		if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_detach()
822 			dma_buf_unpin(attach);  in dma_buf_detach()
823 			dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_detach()
828 	list_del(&attach->node);  in dma_buf_detach()
831 		dmabuf->ops->detach(dmabuf, attach);  in dma_buf_detach()
833 	kfree(attach);  in dma_buf_detach()
840  * @attach:	[in]	attachment which should be pinned
845 int dma_buf_pin(struct dma_buf_attachment *attach)  in dma_buf_pin()  argument
847 	struct dma_buf *dmabuf = attach->dmabuf;  in dma_buf_pin()
853 		ret = dmabuf->ops->pin(attach);  in dma_buf_pin()
862  * @attach:	[in]	attachment which should be unpinned
864 void dma_buf_unpin(struct dma_buf_attachment *attach)  in dma_buf_unpin()  argument
866 	struct dma_buf *dmabuf = attach->dmabuf;  in dma_buf_unpin()
871 		dmabuf->ops->unpin(attach);  in dma_buf_unpin()
879  * @attach:	[in]	attachment whose scatterlist is to be returned
890 struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,  in dma_buf_map_attachment()  argument
898 	if (WARN_ON(!attach || !attach->dmabuf))  in dma_buf_map_attachment()
901 	if (dma_buf_attachment_is_dynamic(attach))  in dma_buf_map_attachment()
902 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_map_attachment()
904 	if (attach->sgt) {  in dma_buf_map_attachment()
909 		if (attach->dir != direction &&  in dma_buf_map_attachment()
910 		    attach->dir != DMA_BIDIRECTIONAL)  in dma_buf_map_attachment()
913 		return attach->sgt;  in dma_buf_map_attachment()
916 	if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_map_attachment()
917 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_map_attachment()
919 			r = dma_buf_pin(attach);  in dma_buf_map_attachment()
925 	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);  in dma_buf_map_attachment()
929 	if (IS_ERR(sg_table) && dma_buf_is_dynamic(attach->dmabuf) &&  in dma_buf_map_attachment()
931 		dma_buf_unpin(attach);  in dma_buf_map_attachment()
933 	if (!IS_ERR(sg_table) && attach->dmabuf->ops->cache_sgt_mapping) {  in dma_buf_map_attachment()
934 		attach->sgt = sg_table;  in dma_buf_map_attachment()
935 		attach->dir = direction;  in dma_buf_map_attachment()
946  * @attach:	[in]	attachment to unmap buffer from
952 void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,  in dma_buf_unmap_attachment()  argument
958 	if (WARN_ON(!attach || !attach->dmabuf || !sg_table))  in dma_buf_unmap_attachment()
961 	if (dma_buf_attachment_is_dynamic(attach))  in dma_buf_unmap_attachment()
962 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_unmap_attachment()
964 	if (attach->sgt == sg_table)  in dma_buf_unmap_attachment()
967 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_unmap_attachment()
968 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_unmap_attachment()
970 	attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);  in dma_buf_unmap_attachment()
972 	if (dma_buf_is_dynamic(attach->dmabuf) &&  in dma_buf_unmap_attachment()
974 		dma_buf_unpin(attach);  in dma_buf_unmap_attachment()
988 	struct dma_buf_attachment *attach;  in dma_buf_move_notify()  local
992 	list_for_each_entry(attach, &dmabuf->attachments, node)  in dma_buf_move_notify()
993 		if (attach->importer_ops)  in dma_buf_move_notify()
994 			attach->importer_ops->move_notify(attach);  in dma_buf_move_notify()