657  * calls attach() of dma_buf_ops to allow device-specific attach functionality
658  * @dmabuf:		[in]	buffer to attach device to.
680 	struct dma_buf_attachment *attach;  in dma_buf_dynamic_attach()  local
689 	attach = kzalloc(sizeof(*attach), GFP_KERNEL);  in dma_buf_dynamic_attach()
690 	if (!attach)  in dma_buf_dynamic_attach()
693 	attach->dev = dev;  in dma_buf_dynamic_attach()
694 	attach->dmabuf = dmabuf;  in dma_buf_dynamic_attach()
696 		attach->peer2peer = importer_ops->allow_peer2peer;  in dma_buf_dynamic_attach()
697 	attach->importer_ops = importer_ops;  in dma_buf_dynamic_attach()
698 	attach->importer_priv = importer_priv;  in dma_buf_dynamic_attach()
700 	if (dmabuf->ops->attach) {  in dma_buf_dynamic_attach()
701 		ret = dmabuf->ops->attach(dmabuf, attach);  in dma_buf_dynamic_attach()
706 	list_add(&attach->node, &dmabuf->attachments);  in dma_buf_dynamic_attach()
713 	if (dma_buf_attachment_is_dynamic(attach) !=  in dma_buf_dynamic_attach()
717 		if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_dynamic_attach()
718 			dma_resv_lock(attach->dmabuf->resv, NULL);  in dma_buf_dynamic_attach()
719 			ret = dma_buf_pin(attach);  in dma_buf_dynamic_attach()
724 		sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL);  in dma_buf_dynamic_attach()
731 		if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
732 			dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_dynamic_attach()
733 		attach->sgt = sgt;  in dma_buf_dynamic_attach()
734 		attach->dir = DMA_BIDIRECTIONAL;  in dma_buf_dynamic_attach()
737 	return attach;  in dma_buf_dynamic_attach()
740 	kfree(attach);  in dma_buf_dynamic_attach()
744 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
745 		dma_buf_unpin(attach);  in dma_buf_dynamic_attach()
748 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_dynamic_attach()
749 		dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_dynamic_attach()
751 	dma_buf_detach(dmabuf, attach);  in dma_buf_dynamic_attach()
758  * @dmabuf:	[in]	buffer to attach device to.
775  * @attach:	[in]	attachment to be detached; is free'd after this call.
779 void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)  in dma_buf_detach()  argument
781 	if (WARN_ON(!dmabuf || !attach))  in dma_buf_detach()
784 	if (attach->sgt) {  in dma_buf_detach()
785 		if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_detach()
786 			dma_resv_lock(attach->dmabuf->resv, NULL);  in dma_buf_detach()
788 		dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);  in dma_buf_detach()
790 		if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_detach()
791 			dma_buf_unpin(attach);  in dma_buf_detach()
792 			dma_resv_unlock(attach->dmabuf->resv);  in dma_buf_detach()
797 	list_del(&attach->node);  in dma_buf_detach()
800 		dmabuf->ops->detach(dmabuf, attach);  in dma_buf_detach()
802 	kfree(attach);  in dma_buf_detach()
809  * @attach:	[in]	attachment which should be pinned
814 int dma_buf_pin(struct dma_buf_attachment *attach)  in dma_buf_pin()  argument
816 	struct dma_buf *dmabuf = attach->dmabuf;  in dma_buf_pin()
822 		ret = dmabuf->ops->pin(attach);  in dma_buf_pin()
831  * @attach:	[in]	attachment which should be unpinned
833 void dma_buf_unpin(struct dma_buf_attachment *attach)  in dma_buf_unpin()  argument
835 	struct dma_buf *dmabuf = attach->dmabuf;  in dma_buf_unpin()
840 		dmabuf->ops->unpin(attach);  in dma_buf_unpin()
848  * @attach:	[in]	attachment whose scatterlist is to be returned
859 struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,  in dma_buf_map_attachment()  argument
867 	if (WARN_ON(!attach || !attach->dmabuf))  in dma_buf_map_attachment()
870 	if (dma_buf_attachment_is_dynamic(attach))  in dma_buf_map_attachment()
871 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_map_attachment()
873 	if (attach->sgt) {  in dma_buf_map_attachment()
878 		if (attach->dir != direction &&  in dma_buf_map_attachment()
879 		    attach->dir != DMA_BIDIRECTIONAL)  in dma_buf_map_attachment()
882 		return attach->sgt;  in dma_buf_map_attachment()
885 	if (dma_buf_is_dynamic(attach->dmabuf)) {  in dma_buf_map_attachment()
886 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_map_attachment()
888 			r = dma_buf_pin(attach);  in dma_buf_map_attachment()
894 	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);  in dma_buf_map_attachment()
898 	if (IS_ERR(sg_table) && dma_buf_is_dynamic(attach->dmabuf) &&  in dma_buf_map_attachment()
900 		dma_buf_unpin(attach);  in dma_buf_map_attachment()
902 	if (!IS_ERR(sg_table) && attach->dmabuf->ops->cache_sgt_mapping) {  in dma_buf_map_attachment()
903 		attach->sgt = sg_table;  in dma_buf_map_attachment()
904 		attach->dir = direction;  in dma_buf_map_attachment()
915  * @attach:	[in]	attachment to unmap buffer from
921 void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,  in dma_buf_unmap_attachment()  argument
927 	if (WARN_ON(!attach || !attach->dmabuf || !sg_table))  in dma_buf_unmap_attachment()
930 	if (dma_buf_attachment_is_dynamic(attach))  in dma_buf_unmap_attachment()
931 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_unmap_attachment()
933 	if (attach->sgt == sg_table)  in dma_buf_unmap_attachment()
936 	if (dma_buf_is_dynamic(attach->dmabuf))  in dma_buf_unmap_attachment()
937 		dma_resv_assert_held(attach->dmabuf->resv);  in dma_buf_unmap_attachment()
939 	attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);  in dma_buf_unmap_attachment()
941 	if (dma_buf_is_dynamic(attach->dmabuf) &&  in dma_buf_unmap_attachment()
943 		dma_buf_unpin(attach);  in dma_buf_unmap_attachment()
957 	struct dma_buf_attachment *attach;  in dma_buf_move_notify()  local
961 	list_for_each_entry(attach, &dmabuf->attachments, node)  in dma_buf_move_notify()
962 		if (attach->importer_ops)  in dma_buf_move_notify()
963 			attach->importer_ops->move_notify(attach);  in dma_buf_move_notify()