1 // SPDX-License-Identifier: GPL-2.0-only
3  * OF helpers for IOMMU
9 #include <linux/iommu.h>
20 #include "iommu-priv.h"
28 	if (!of_device_is_available(iommu_spec->np))  in of_iommu_xlate()
29 		return -ENODEV;  in of_iommu_xlate()
31 	ret = iommu_fwspec_init(dev, of_fwnode_handle(iommu_spec->np));  in of_iommu_xlate()
35 	ops = iommu_ops_from_fwnode(&iommu_spec->np->fwnode);  in of_iommu_xlate()
36 	if (!ops->of_xlate || !try_module_get(ops->owner))  in of_iommu_xlate()
37 		return -ENODEV;  in of_iommu_xlate()
39 	ret = ops->of_xlate(dev, iommu_spec);  in of_iommu_xlate()
40 	module_put(ops->owner);  in of_iommu_xlate()
51 	err = of_map_id(master_np, *id, "iommu-map",  in of_iommu_configure_dev_id()
52 			 "iommu-map-mask", &iommu_spec.np,  in of_iommu_configure_dev_id()
66 	int err = -ENODEV, idx = 0;  in of_iommu_configure_dev()
69 					   "#iommu-cells",  in of_iommu_configure_dev()
91 	return of_iommu_configure_dev_id(info->np, info->dev, &input_id);  in of_pci_iommu_init()
105 	if (fwspec && of_property_read_bool(np, "ats-supported"))  in of_pci_check_device_ats()
106 		fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;  in of_pci_check_device_ats()
111  *  0 on success, an iommu was configured
112  *  -ENODEV if the device does not have any IOMMU
113  *  -EPROBEDEFER if probing should be tried again
114  *  -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()
132 	 * We don't currently walk up the tree looking for a parent IOMMU.  in of_iommu_configure()
134 	 * Documentation/devicetree/bindings/iommu/iommu.txt  in of_iommu_configure()
154 	if (!err && dev->bus)  in of_iommu_configure()
157 	if (err && err != -EPROBE_DEFER)  in of_iommu_configure()
158 		dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);  in of_iommu_configure()
168 	phys_addr_t end = start + length - 1;  in iommu_resv_region_get_type()
171 	 * IOMMU regions without an associated physical region cannot be  in iommu_resv_region_get_type()
174 	if (phys->start >= phys->end)  in iommu_resv_region_get_type()
178 	if (start == phys->start && end == phys->end)  in iommu_resv_region_get_type()
181 	dev_warn(dev, "treating non-direct mapping [%pr] -> [%pap-%pap] as reservation\n", phys,  in iommu_resv_region_get_type()
187  * of_iommu_get_resv_regions - reserved region driver helper for device tree
191  * IOMMU drivers can use this to implement their .get_resv_regions() callback
192  * for memory regions attached to a device tree node. See the reserved-memory
195  *   Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
203 	of_for_each_phandle(&it, err, dev->of_node, "memory-region", NULL, 0) {  in of_iommu_get_resv_regions()
211 		 * The "reg" property is optional and can be omitted by reserved-memory regions  in of_iommu_get_resv_regions()
224 		maps = of_get_property(it.node, "iommu-addresses", &size);  in of_iommu_get_resv_regions()
237 			if (np == dev->of_node) {  in of_iommu_get_resv_regions()
244 				if (of_dma_is_coherent(dev->of_node))  in of_iommu_get_resv_regions()
257 					list_add_tail(&region->list, list);  in of_iommu_get_resv_regions()