1 // SPDX-License-Identifier: GPL-2.0-only
3  * OF helpers for IOMMU
9 #include <linux/iommu.h>
24 	struct fwnode_handle *fwnode = &iommu_spec->np->fwnode;  in of_iommu_xlate()
28 	if ((ops && !ops->of_xlate) ||  in of_iommu_xlate()
29 	    !of_device_is_available(iommu_spec->np))  in of_iommu_xlate()
30 		return -ENODEV;  in of_iommu_xlate()
32 	ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);  in of_iommu_xlate()
36 	 * The otherwise-empty fwspec handily serves to indicate the specific  in of_iommu_xlate()
37 	 * IOMMU device we're waiting for, which will be useful if we ever get  in of_iommu_xlate()
38 	 * a proper probe-ordering dependency mechanism in future.  in of_iommu_xlate()
43 	if (!try_module_get(ops->owner))  in of_iommu_xlate()
44 		return -ENODEV;  in of_iommu_xlate()
46 	ret = ops->of_xlate(dev, iommu_spec);  in of_iommu_xlate()
47 	module_put(ops->owner);  in of_iommu_xlate()
58 	err = of_map_id(master_np, *id, "iommu-map",  in of_iommu_configure_dev_id()
59 			 "iommu-map-mask", &iommu_spec.np,  in of_iommu_configure_dev_id()
73 	int err = -ENODEV, idx = 0;  in of_iommu_configure_dev()
76 					   "#iommu-cells",  in of_iommu_configure_dev()
98 	return of_iommu_configure_dev_id(info->np, info->dev, &input_id);  in of_pci_iommu_init()
110  *  0 on success, an iommu was configured
111  *  -ENODEV if the device does not have any IOMMU
112  *  -EPROBEDEFER if probing should be tried again
113  *  -errno fatal errors
122 		return -ENODEV;  in of_iommu_configure()
124 	/* Serialise to make dev->iommu stable under our potential fwspec */  in of_iommu_configure()
128 		if (fwspec->ops) {  in of_iommu_configure()
137 	 * We don't currently walk up the tree looking for a parent IOMMU.  in of_iommu_configure()
139 	 * Documentation/devicetree/bindings/iommu/iommu.txt  in of_iommu_configure()
155 	if (err == -ENODEV || err == -EPROBE_DEFER)  in of_iommu_configure()
166 	dev_dbg(dev, "Adding to IOMMU failed: %pe\n", ERR_PTR(err));  in of_iommu_configure()
175 	phys_addr_t end = start + length - 1;  in iommu_resv_region_get_type()
178 	 * IOMMU regions without an associated physical region cannot be  in iommu_resv_region_get_type()
181 	if (phys->start >= phys->end)  in iommu_resv_region_get_type()
185 	if (start == phys->start && end == phys->end)  in iommu_resv_region_get_type()
188 	dev_warn(dev, "treating non-direct mapping [%pr] -> [%pap-%pap] as reservation\n", phys,  in iommu_resv_region_get_type()
194  * of_iommu_get_resv_regions - reserved region driver helper for device tree
198  * IOMMU drivers can use this to implement their .get_resv_regions() callback
199  * for memory regions attached to a device tree node. See the reserved-memory
202  *   Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
210 	of_for_each_phandle(&it, err, dev->of_node, "memory-region", NULL, 0) {  in of_iommu_get_resv_regions()
218 		 * The "reg" property is optional and can be omitted by reserved-memory regions  in of_iommu_get_resv_regions()
231 		maps = of_get_property(it.node, "iommu-addresses", &size);  in of_iommu_get_resv_regions()
244 			if (np == dev->of_node) {  in of_iommu_get_resv_regions()
251 				if (of_dma_is_coherent(dev->of_node))  in of_iommu_get_resv_regions()
264 					list_add_tail(&region->list, list);  in of_iommu_get_resv_regions()