1 // SPDX-License-Identifier: GPL-2.0
6  * para-virtual IOMMUs and the endpoints they manage. The OS uses it to
16  * hasn't yet been initialized, VIOT returns -EPROBE_DEFER to postpone probing
25 #include <linux/pci.h>
37 		/* PCI range */
62 			     max_t(size_t, sizeof(*viot), viot->node_offset));  in viot_check_bounds()
63 	end = ACPI_ADD_PTR(struct acpi_viot_header, viot, viot->header.length);  in viot_check_bounds()
68 		return -EOVERFLOW;  in viot_check_bounds()
70 	if (hdr->length < sizeof(*hdr)) {  in viot_check_bounds()
72 		return -EINVAL;  in viot_check_bounds()
86 		pr_err("Could not find PCI IOMMU\n");  in viot_get_pci_iommu_fwnode()
87 		return -ENODEV;  in viot_get_pci_iommu_fwnode()
90 	fwnode = dev_fwnode(&pdev->dev);  in viot_get_pci_iommu_fwnode()
93 		 * PCI devices aren't necessarily described by ACPI. Create a  in viot_get_pci_iommu_fwnode()
99 			return -ENOMEM;  in viot_get_pci_iommu_fwnode()
101 		set_primary_fwnode(&pdev->dev, fwnode);  in viot_get_pci_iommu_fwnode()
103 	viommu->fwnode = dev_fwnode(&pdev->dev);  in viot_get_pci_iommu_fwnode()
121 		return -EINVAL;  in viot_get_mmio_iommu_fwnode()
123 	viommu->fwnode = &adev->fwnode;  in viot_get_mmio_iommu_fwnode()
134 		struct acpi_viot_virtio_iommu_pci pci;  in viot_get_iommu()  member
139 		if (viommu->offset == offset)  in viot_get_iommu()
149 	viommu->offset = offset;  in viot_get_iommu()
150 	switch (hdr->type) {  in viot_get_iommu()
152 		if (hdr->length < sizeof(node->pci))  in viot_get_iommu()
155 		ret = viot_get_pci_iommu_fwnode(viommu, node->pci.segment,  in viot_get_iommu()
156 						node->pci.bdf);  in viot_get_iommu()
159 		if (hdr->length < sizeof(node->mmio))  in viot_get_iommu()
163 						 node->mmio.base_address);  in viot_get_iommu()
166 		ret = -EINVAL;  in viot_get_iommu()
171 	list_add(&viommu->list, &viot_iommus);  in viot_get_iommu()
181 	int ret = -EINVAL;  in viot_parse_node()
183 	struct viot_endpoint *ep;  in viot_parse_node()  local
186 		struct acpi_viot_pci_range pci;  in viot_parse_node()  member
190 		return -EINVAL;  in viot_parse_node()
192 	if (hdr->type == ACPI_VIOT_NODE_VIRTIO_IOMMU_PCI ||  in viot_parse_node()
193 	    hdr->type == ACPI_VIOT_NODE_VIRTIO_IOMMU_MMIO)  in viot_parse_node()
196 	ep = kzalloc(sizeof(*ep), GFP_KERNEL);  in viot_parse_node()
197 	if (!ep)  in viot_parse_node()
198 		return -ENOMEM;  in viot_parse_node()
200 	switch (hdr->type) {  in viot_parse_node()
202 		if (hdr->length < sizeof(node->pci)) {  in viot_parse_node()
203 			pr_err(FW_BUG "Invalid PCI node size\n");  in viot_parse_node()
207 		ep->segment_start = node->pci.segment_start;  in viot_parse_node()
208 		ep->segment_end = node->pci.segment_end;  in viot_parse_node()
209 		ep->bdf_start = node->pci.bdf_start;  in viot_parse_node()
210 		ep->bdf_end = node->pci.bdf_end;  in viot_parse_node()
211 		ep->endpoint_id = node->pci.endpoint_start;  in viot_parse_node()
212 		ep->viommu = viot_get_iommu(node->pci.output_node);  in viot_parse_node()
216 		if (hdr->length < sizeof(node->mmio)) {  in viot_parse_node()
221 		ep->address = node->mmio.base_address;  in viot_parse_node()
222 		ep->endpoint_id = node->mmio.endpoint;  in viot_parse_node()
223 		ep->viommu = viot_get_iommu(node->mmio.output_node);  in viot_parse_node()
227 		pr_warn("Unsupported node %x\n", hdr->type);  in viot_parse_node()
232 	if (!ep->viommu) {  in viot_parse_node()
242 	list_add(&ep->list, list);  in viot_parse_node()
246 	kfree(ep);  in viot_parse_node()
251  * acpi_viot_early_init - Test the presence of VIOT and enable ACS
271  * acpi_viot_init - Parse the VIOT table
295 	node = ACPI_ADD_PTR(struct acpi_viot_header, viot, viot->node_offset);  in acpi_viot_init()
296 	for (i = 0; i < viot->node_count; i++) {  in acpi_viot_init()
301 				    node->length);  in acpi_viot_init()
311 		return -ENODEV;  in viot_dev_iommu_init()
314 	if (device_match_fwnode(dev, viommu->fwnode))  in viot_dev_iommu_init()
315 		return -EINVAL;  in viot_dev_iommu_init()
317 	return acpi_iommu_fwspec_init(dev, epid, viommu->fwnode);  in viot_dev_iommu_init()
323 	struct viot_endpoint *ep;  in viot_pci_dev_iommu_init()  local
325 	u32 domain_nr = pci_domain_nr(pdev->bus);  in viot_pci_dev_iommu_init()
327 	list_for_each_entry(ep, &viot_pci_ranges, list) {  in viot_pci_dev_iommu_init()
328 		if (domain_nr >= ep->segment_start &&  in viot_pci_dev_iommu_init()
329 		    domain_nr <= ep->segment_end &&  in viot_pci_dev_iommu_init()
330 		    dev_id >= ep->bdf_start &&  in viot_pci_dev_iommu_init()
331 		    dev_id <= ep->bdf_end) {  in viot_pci_dev_iommu_init()
332 			epid = ((domain_nr - ep->segment_start) << 16) +  in viot_pci_dev_iommu_init()
333 				dev_id - ep->bdf_start + ep->endpoint_id;  in viot_pci_dev_iommu_init()
335 			return viot_dev_iommu_init(aliased_dev, ep->viommu,  in viot_pci_dev_iommu_init()
339 	return -ENODEV;  in viot_pci_dev_iommu_init()
345 	struct viot_endpoint *ep;  in viot_mmio_dev_iommu_init()  local
349 		return -ENODEV;  in viot_mmio_dev_iommu_init()
351 	list_for_each_entry(ep, &viot_mmio_endpoints, list) {  in viot_mmio_dev_iommu_init()
352 		if (ep->address == mem->start)  in viot_mmio_dev_iommu_init()
353 			return viot_dev_iommu_init(&pdev->dev, ep->viommu,  in viot_mmio_dev_iommu_init()
354 						   ep->endpoint_id);  in viot_mmio_dev_iommu_init()
356 	return -ENODEV;  in viot_mmio_dev_iommu_init()
360  * viot_iommu_configure - Setup IOMMU ops for an endpoint described by VIOT
372 	return -ENODEV;  in viot_iommu_configure()