3  * Xen grant DMA-mapping layer - contains special DMA-mapping routines
4  * for providing grant references as DMA addresses to be used by frontends
33 static inline dma_addr_t grant_to_dma(grant_ref_t grant)  in grant_to_dma()  argument
35 	return XEN_GRANT_DMA_ADDR_OFF | ((dma_addr_t)grant << XEN_PAGE_SHIFT);  in grant_to_dma()
74  * Such a DMA address is formed by using the grant reference as a frame
85 	grant_ref_t grant;  in xen_grant_dma_alloc()  local
101 	if (gnttab_alloc_grant_reference_seq(n_pages, &grant)) {  in xen_grant_dma_alloc()
107 		gnttab_grant_foreign_access_ref(grant + i, data->backend_domid,  in xen_grant_dma_alloc()
111 	*dma_handle = grant_to_dma(grant);  in xen_grant_dma_alloc()
121 	grant_ref_t grant;  in xen_grant_dma_free()  local
130 	grant = dma_to_grant(dma_handle);  in xen_grant_dma_free()
133 		if (unlikely(!gnttab_end_foreign_access_ref(grant + i))) {  in xen_grant_dma_free()
134 			dev_alert(dev, "Grant still in use by backend domain, disabled for further use\n");  in xen_grant_dma_free()
140 	gnttab_free_grant_reference_seq(grant, n_pages);  in xen_grant_dma_free()
175 	grant_ref_t grant;  in xen_grant_dma_map_page()  local
188 	if (gnttab_alloc_grant_reference_seq(n_pages, &grant))  in xen_grant_dma_map_page()
192 		gnttab_grant_foreign_access_ref(grant + i, data->backend_domid,  in xen_grant_dma_map_page()
197 	dma_handle = grant_to_dma(grant) + dma_offset;  in xen_grant_dma_map_page()
209 	grant_ref_t grant;  in xen_grant_dma_unmap_page()  local
221 	grant = dma_to_grant(dma_handle);  in xen_grant_dma_unmap_page()
224 		if (unlikely(!gnttab_end_foreign_access_ref(grant + i))) {  in xen_grant_dma_unmap_page()
225 			dev_alert(dev, "Grant still in use by backend domain, disabled for further use\n");  in xen_grant_dma_unmap_page()
231 	gnttab_free_grant_reference_seq(grant, n_pages);  in xen_grant_dma_unmap_page()
337 	if (!of_device_is_compatible(iommu_spec.np, "xen,grant-dma") ||  in xen_dt_grant_init_backend_domid()
380 		dev_err(dev, "Xen grant DMA data is already created\n");  in xen_grant_setup_dma_ops()
391 		dev_err(dev, "Cannot store Xen grant DMA data\n");  in xen_grant_setup_dma_ops()
401 	dev_err(dev, "Cannot set up Xen grant DMA ops, retain platform DMA ops\n");  in xen_grant_setup_dma_ops()
416 MODULE_DESCRIPTION("Xen grant DMA-mapping layer");