670  * calls attach() of dma_buf_ops to allow device-specific attach functionality
671  * @dmabuf:		[in]	buffer to attach device to.
693 	struct dma_buf_attachment *attach;  in dma_buf_dynamic_attach()  local
702 	attach = kzalloc(sizeof(*attach), GFP_KERNEL);  in dma_buf_dynamic_attach()
703 	if (!attach)  in dma_buf_dynamic_attach()
706 	attach->dev = dev;  in dma_buf_dynamic_attach()
707 	attach->dmabuf = dmabuf;  in dma_buf_dynamic_attach()
709 		attach->peer2peer = importer_ops->allow_peer2peer;  in dma_buf_dynamic_attach()
710 	attach->importer_ops = importer_ops;  in dma_buf_dynamic_attach()
711 	attach->importer_priv = importer_priv;  in dma_buf_dynamic_attach()
713 	if (dmabuf->ops->attach) {  in dma_buf_dynamic_attach()
714 		ret = dmabuf->ops->attach(dmabuf, attach);  in dma_buf_dynamic_attach()
719 	list_add(&attach->node, &dmabuf->attachments);  in dma_buf_dynamic_attach()
726 	if (dma_buf_attachment_is_dynamic(attach) !=  in dma_buf_dynamic_attach()
730 		if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_dynamic_attach()
731 			dma_resv_lock(attach->dmabuf->resv, NULL);  in dma_buf_dynamic_attach()
732 			ret = dma_buf_pin(attach);  in dma_buf_dynamic_attach()
737 		sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL);  in dma_buf_dynamic_attach()
744 		if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
745 			dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_dynamic_attach()
746 		attach->sgt = sgt;  in dma_buf_dynamic_attach()
747 		attach->dir = DMA_BIDIRECTIONAL;  in dma_buf_dynamic_attach()
750 	return attach;  in dma_buf_dynamic_attach()
753 	kfree(attach);  in dma_buf_dynamic_attach()
757 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
758 		dma_buf_unpin(attach);  in dma_buf_dynamic_attach()
761 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
762 		dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_dynamic_attach()
764 	dma_buf_detach(dmabuf, attach);  in dma_buf_dynamic_attach()
771  * @dmabuf:	[in]	buffer to attach device to.
788  * @attach:	[in]	attachment to be detached; is free'd after this call.
792 void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)  in dma_buf_detach()  argument
794 	if (WARN_ON(!dmabuf || !attach))  in dma_buf_detach()
797 	if (attach->sgt) {  in dma_buf_detach()
798 		if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_detach()
799 			dma_resv_lock(attach->dmabuf->resv, NULL);  in dma_buf_detach()
801 		dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);  in dma_buf_detach()
803 		if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_detach()
804 			dma_buf_unpin(attach);  in dma_buf_detach()
805 			dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_detach()
810 	list_del(&attach->node);  in dma_buf_detach()
813 		dmabuf->ops->detach(dmabuf, attach);  in dma_buf_detach()
815 	kfree(attach);  in dma_buf_detach()
822  * @attach:	[in]	attachment which should be pinned
827 int dma_buf_pin(struct dma_buf_attachment *attach)  in dma_buf_pin()  argument
829 	struct dma_buf *dmabuf = attach->dmabuf;  in dma_buf_pin()
835 		ret = dmabuf->ops->pin(attach);  in dma_buf_pin()
844  * @attach:	[in]	attachment which should be unpinned
846 void dma_buf_unpin(struct dma_buf_attachment *attach)  in dma_buf_unpin()  argument
848 	struct dma_buf *dmabuf = attach->dmabuf;  in dma_buf_unpin()
853 		dmabuf->ops->unpin(attach);  in dma_buf_unpin()
861  * @attach:	[in]	attachment whose scatterlist is to be returned
872 struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,  in dma_buf_map_attachment()  argument
880 	if (WARN_ON(!attach || !attach->dmabuf))  in dma_buf_map_attachment()
883 	if (dma_buf_attachment_is_dynamic(attach))  in dma_buf_map_attachment()
884 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_map_attachment()
886 	if (attach->sgt) {  in dma_buf_map_attachment()
891 		if (attach->dir != direction &&  in dma_buf_map_attachment()
892 		    attach->dir != DMA_BIDIRECTIONAL)  in dma_buf_map_attachment()
895 		return attach->sgt;  in dma_buf_map_attachment()
898 	if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_map_attachment()
899 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_map_attachment()
901 			r = dma_buf_pin(attach);  in dma_buf_map_attachment()
907 	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);  in dma_buf_map_attachment()
911 	if (IS_ERR(sg_table) && dma_buf_is_dynamic(attach->dmabuf) &&  in dma_buf_map_attachment()
913 		dma_buf_unpin(attach);  in dma_buf_map_attachment()
915 	if (!IS_ERR(sg_table) && attach->dmabuf->ops->cache_sgt_mapping) {  in dma_buf_map_attachment()
916 		attach->sgt = sg_table;  in dma_buf_map_attachment()
917 		attach->dir = direction;  in dma_buf_map_attachment()
928  * @attach:	[in]	attachment to unmap buffer from
934 void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,  in dma_buf_unmap_attachment()  argument
940 	if (WARN_ON(!attach || !attach->dmabuf || !sg_table))  in dma_buf_unmap_attachment()
943 	if (dma_buf_attachment_is_dynamic(attach))  in dma_buf_unmap_attachment()
944 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_unmap_attachment()
946 	if (attach->sgt == sg_table)  in dma_buf_unmap_attachment()
949 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_unmap_attachment()
950 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_unmap_attachment()
952 	attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);  in dma_buf_unmap_attachment()
954 	if (dma_buf_is_dynamic(attach->dmabuf) &&  in dma_buf_unmap_attachment()
956 		dma_buf_unpin(attach);  in dma_buf_unmap_attachment()
970 	struct dma_buf_attachment *attach;  in dma_buf_move_notify()  local
974 	list_for_each_entry(attach, &dmabuf->attachments, node)  in dma_buf_move_notify()
975 		if (attach->importer_ops)  in dma_buf_move_notify()
976 			attach->importer_ops->move_notify(attach);  in dma_buf_move_notify()