1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2016, Semihalf
4 * Author: Tomasz Nowicki <tn@semihalf.com>
6 * This file implements early detection/parsing of I/O mapping
7 * reported to OS through firmware via I/O Remapping Table (IORT)
8 * IORT document number: ARM DEN 0049A
11 #define pr_fmt(fmt) "ACPI: IORT: " fmt
13 #include <linux/acpi_iort.h>
14 #include <linux/bitfield.h>
15 #include <linux/iommu.h>
16 #include <linux/kernel.h>
17 #include <linux/list.h>
18 #include <linux/pci.h>
19 #include <linux/platform_device.h>
20 #include <linux/slab.h>
21 #include <linux/dma-map-ops.h>
23 #define IORT_TYPE_MASK(type) (1 << (type))
24 #define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP)
25 #define IORT_IOMMU_TYPE ((1 << ACPI_IORT_NODE_SMMU) | \
26 (1 << ACPI_IORT_NODE_SMMU_V3))
28 struct iort_its_msi_chip {
29 struct list_head list;
30 struct fwnode_handle *fw_node;
31 phys_addr_t base_addr;
36 struct list_head list;
37 struct acpi_iort_node *iort_node;
38 struct fwnode_handle *fwnode;
40 static LIST_HEAD(iort_fwnode_list);
41 static DEFINE_SPINLOCK(iort_fwnode_lock);
44 * iort_set_fwnode() - Create iort_fwnode and use it to register
45 * iommu data in the iort_fwnode_list
47 * @iort_node: IORT table node associated with the IOMMU
48 * @fwnode: fwnode associated with the IORT node
50 * Returns: 0 on success
53 static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
54 struct fwnode_handle *fwnode)
56 struct iort_fwnode *np;
58 np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC);
63 INIT_LIST_HEAD(&np->list);
64 np->iort_node = iort_node;
67 spin_lock(&iort_fwnode_lock);
68 list_add_tail(&np->list, &iort_fwnode_list);
69 spin_unlock(&iort_fwnode_lock);
75 * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
77 * @node: IORT table node to be looked-up
79 * Returns: fwnode_handle pointer on success, NULL on failure
81 static inline struct fwnode_handle *iort_get_fwnode(
82 struct acpi_iort_node *node)
84 struct iort_fwnode *curr;
85 struct fwnode_handle *fwnode = NULL;
87 spin_lock(&iort_fwnode_lock);
88 list_for_each_entry(curr, &iort_fwnode_list, list) {
89 if (curr->iort_node == node) {
90 fwnode = curr->fwnode;
94 spin_unlock(&iort_fwnode_lock);
100 * iort_delete_fwnode() - Delete fwnode associated with an IORT node
102 * @node: IORT table node associated with fwnode to delete
104 static inline void iort_delete_fwnode(struct acpi_iort_node *node)
106 struct iort_fwnode *curr, *tmp;
108 spin_lock(&iort_fwnode_lock);
109 list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list) {
110 if (curr->iort_node == node) {
111 list_del(&curr->list);
116 spin_unlock(&iort_fwnode_lock);
120 * iort_get_iort_node() - Retrieve iort_node associated with an fwnode
122 * @fwnode: fwnode associated with device to be looked-up
124 * Returns: iort_node pointer on success, NULL on failure
126 static inline struct acpi_iort_node *iort_get_iort_node(
127 struct fwnode_handle *fwnode)
129 struct iort_fwnode *curr;
130 struct acpi_iort_node *iort_node = NULL;
132 spin_lock(&iort_fwnode_lock);
133 list_for_each_entry(curr, &iort_fwnode_list, list) {
134 if (curr->fwnode == fwnode) {
135 iort_node = curr->iort_node;
139 spin_unlock(&iort_fwnode_lock);
144 typedef acpi_status (*iort_find_node_callback)
145 (struct acpi_iort_node *node, void *context);
147 /* Root pointer to the mapped IORT table */
148 static struct acpi_table_header *iort_table;
150 static LIST_HEAD(iort_msi_chip_list);
151 static DEFINE_SPINLOCK(iort_msi_chip_lock);
154 * iort_register_domain_token() - register domain token along with related
155 * ITS ID and base address to the list from where we can get it back later on.
157 * @base: ITS base address.
158 * @fw_node: Domain token.
160 * Returns: 0 on success, -ENOMEM if no memory when allocating list element
162 int iort_register_domain_token(int trans_id, phys_addr_t base,
163 struct fwnode_handle *fw_node)
165 struct iort_its_msi_chip *its_msi_chip;
167 its_msi_chip = kzalloc(sizeof(*its_msi_chip), GFP_KERNEL);
171 its_msi_chip->fw_node = fw_node;
172 its_msi_chip->translation_id = trans_id;
173 its_msi_chip->base_addr = base;
175 spin_lock(&iort_msi_chip_lock);
176 list_add(&its_msi_chip->list, &iort_msi_chip_list);
177 spin_unlock(&iort_msi_chip_lock);
183 * iort_deregister_domain_token() - Deregister domain token based on ITS ID
188 void iort_deregister_domain_token(int trans_id)
190 struct iort_its_msi_chip *its_msi_chip, *t;
192 spin_lock(&iort_msi_chip_lock);
193 list_for_each_entry_safe(its_msi_chip, t, &iort_msi_chip_list, list) {
194 if (its_msi_chip->translation_id == trans_id) {
195 list_del(&its_msi_chip->list);
200 spin_unlock(&iort_msi_chip_lock);
204 * iort_find_domain_token() - Find domain token based on given ITS ID
207 * Returns: domain token when find on the list, NULL otherwise
209 struct fwnode_handle *iort_find_domain_token(int trans_id)
211 struct fwnode_handle *fw_node = NULL;
212 struct iort_its_msi_chip *its_msi_chip;
214 spin_lock(&iort_msi_chip_lock);
215 list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
216 if (its_msi_chip->translation_id == trans_id) {
217 fw_node = its_msi_chip->fw_node;
221 spin_unlock(&iort_msi_chip_lock);
226 static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
227 iort_find_node_callback callback,
230 struct acpi_iort_node *iort_node, *iort_end;
231 struct acpi_table_iort *iort;
237 /* Get the first IORT node */
238 iort = (struct acpi_table_iort *)iort_table;
239 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
241 iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
244 for (i = 0; i < iort->node_count; i++) {
245 if (WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND,
246 "IORT node pointer overflows, bad table!\n"))
249 if (iort_node->type == type &&
250 ACPI_SUCCESS(callback(iort_node, context)))
253 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
260 static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
263 struct device *dev = context;
264 acpi_status status = AE_NOT_FOUND;
266 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
267 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
268 struct acpi_device *adev;
269 struct acpi_iort_named_component *ncomp;
270 struct device *nc_dev = dev;
273 * Walk the device tree to find a device with an
274 * ACPI companion; there is no point in scanning
275 * IORT for a device matching a named component if
276 * the device does not have an ACPI companion to
280 adev = ACPI_COMPANION(nc_dev);
284 nc_dev = nc_dev->parent;
290 status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
291 if (ACPI_FAILURE(status)) {
292 dev_warn(nc_dev, "Can't get device full path name\n");
296 ncomp = (struct acpi_iort_named_component *)node->node_data;
297 status = !strcmp(ncomp->device_name, buf.pointer) ?
298 AE_OK : AE_NOT_FOUND;
299 acpi_os_free(buf.pointer);
300 } else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
301 struct acpi_iort_root_complex *pci_rc;
304 bus = to_pci_bus(dev);
305 pci_rc = (struct acpi_iort_root_complex *)node->node_data;
308 * It is assumed that PCI segment numbers maps one-to-one
309 * with root complexes. Each segment number can represent only
312 status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
313 AE_OK : AE_NOT_FOUND;
319 static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
320 u32 *rid_out, bool check_overlap)
322 /* Single mapping does not care for input id */
323 if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
324 if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
325 type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
326 *rid_out = map->output_base;
330 pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
335 if (rid_in < map->input_base ||
336 (rid_in > map->input_base + map->id_count))
341 * We already found a mapping for this input ID at the end of
342 * another region. If it coincides with the start of this
343 * region, we assume the prior match was due to the off-by-1
344 * issue mentioned below, and allow it to be superseded.
345 * Otherwise, things are *really* broken, and we just disregard
346 * duplicate matches entirely to retain compatibility.
348 pr_err(FW_BUG "[map %p] conflicting mapping for input ID 0x%x\n",
350 if (rid_in != map->input_base)
353 pr_err(FW_BUG "applying workaround.\n");
356 *rid_out = map->output_base + (rid_in - map->input_base);
359 * Due to confusion regarding the meaning of the id_count field (which
360 * carries the number of IDs *minus 1*), we may have to disregard this
361 * match if it is at the end of the range, and overlaps with the start
364 if (map->id_count > 0 && rid_in == map->input_base + map->id_count)
369 static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
370 u32 *id_out, int index)
372 struct acpi_iort_node *parent;
373 struct acpi_iort_id_mapping *map;
375 if (!node->mapping_offset || !node->mapping_count ||
376 index >= node->mapping_count)
379 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
380 node->mapping_offset + index * sizeof(*map));
383 if (!map->output_reference) {
384 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
389 parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
390 map->output_reference);
392 if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
393 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
394 node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
395 node->type == ACPI_IORT_NODE_SMMU_V3 ||
396 node->type == ACPI_IORT_NODE_PMCG) {
397 *id_out = map->output_base;
405 static int iort_get_id_mapping_index(struct acpi_iort_node *node)
407 struct acpi_iort_smmu_v3 *smmu;
408 struct acpi_iort_pmcg *pmcg;
410 switch (node->type) {
411 case ACPI_IORT_NODE_SMMU_V3:
413 * SMMUv3 dev ID mapping index was introduced in revision 1
414 * table, not available in revision 0
416 if (node->revision < 1)
419 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
421 * ID mapping index is only ignored if all interrupts are
424 if (smmu->event_gsiv && smmu->pri_gsiv && smmu->gerr_gsiv
428 if (smmu->id_mapping_index >= node->mapping_count) {
429 pr_err(FW_BUG "[node %p type %d] ID mapping index overflows valid mappings\n",
434 return smmu->id_mapping_index;
435 case ACPI_IORT_NODE_PMCG:
436 pmcg = (struct acpi_iort_pmcg *)node->node_data;
437 if (pmcg->overflow_gsiv || node->mapping_count == 0)
446 static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
447 u32 id_in, u32 *id_out,
452 /* Parse the ID mapping tree to find specified node type */
454 struct acpi_iort_id_mapping *map;
455 int i, index, rc = 0;
456 u32 out_ref = 0, map_id = id;
458 if (IORT_TYPE_MASK(node->type) & type_mask) {
464 if (!node->mapping_offset || !node->mapping_count)
467 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
468 node->mapping_offset);
471 if (!map->output_reference) {
472 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
478 * Get the special ID mapping index (if any) and skip its
479 * associated ID map to prevent erroneous multi-stage
480 * IORT ID translations.
482 index = iort_get_id_mapping_index(node);
484 /* Do the ID translation */
485 for (i = 0; i < node->mapping_count; i++, map++) {
486 /* if it is special mapping index, skip it */
490 rc = iort_id_map(map, node->type, map_id, &id, out_ref);
494 out_ref = map->output_reference;
497 if (i == node->mapping_count && !out_ref)
500 node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
501 rc ? out_ref : map->output_reference);
505 /* Map input ID to output ID unchanged on mapping failure */
512 static struct acpi_iort_node *iort_node_map_platform_id(
513 struct acpi_iort_node *node, u32 *id_out, u8 type_mask,
516 struct acpi_iort_node *parent;
519 /* step 1: retrieve the initial dev id */
520 parent = iort_node_get_id(node, &id, index);
525 * optional step 2: map the initial dev id if its parent is not
526 * the target type we want, map it again for the use cases such
527 * as NC (named component) -> SMMU -> ITS. If the type is matched,
528 * return the initial dev id and its parent pointer directly.
530 if (!(IORT_TYPE_MASK(parent->type) & type_mask))
531 parent = iort_node_map_id(parent, id, id_out, type_mask);
539 static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
541 struct pci_bus *pbus;
543 if (!dev_is_pci(dev)) {
544 struct acpi_iort_node *node;
546 * scan iort_fwnode_list to see if it's an iort platform
547 * device (such as SMMU, PMCG),its iort node already cached
548 * and associated with fwnode when iort platform devices
551 node = iort_get_iort_node(dev->fwnode);
555 * if not, then it should be a platform device defined in
556 * DSDT/SSDT (with Named Component node in IORT)
558 return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
559 iort_match_node_callback, dev);
562 pbus = to_pci_dev(dev)->bus;
564 return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
565 iort_match_node_callback, &pbus->dev);
569 * iort_msi_map_id() - Map a MSI input ID for a device
570 * @dev: The device for which the mapping is to be done.
571 * @input_id: The device input ID.
573 * Returns: mapped MSI ID on success, input ID otherwise
575 u32 iort_msi_map_id(struct device *dev, u32 input_id)
577 struct acpi_iort_node *node;
580 node = iort_find_dev_node(dev);
584 iort_node_map_id(node, input_id, &dev_id, IORT_MSI_TYPE);
589 * iort_pmsi_get_dev_id() - Get the device id for a device
590 * @dev: The device for which the mapping is to be done.
591 * @dev_id: The device ID found.
593 * Returns: 0 for successful find a dev id, -ENODEV on error
595 int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
598 struct acpi_iort_node *node;
600 node = iort_find_dev_node(dev);
604 index = iort_get_id_mapping_index(node);
605 /* if there is a valid index, go get the dev_id directly */
607 if (iort_node_get_id(node, dev_id, index))
610 for (i = 0; i < node->mapping_count; i++) {
611 if (iort_node_map_platform_id(node, dev_id,
620 static int __maybe_unused iort_find_its_base(u32 its_id, phys_addr_t *base)
622 struct iort_its_msi_chip *its_msi_chip;
625 spin_lock(&iort_msi_chip_lock);
626 list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
627 if (its_msi_chip->translation_id == its_id) {
628 *base = its_msi_chip->base_addr;
633 spin_unlock(&iort_msi_chip_lock);
639 * iort_dev_find_its_id() - Find the ITS identifier for a device
642 * @idx: Index of the ITS identifier list.
643 * @its_id: ITS identifier.
645 * Returns: 0 on success, appropriate error value otherwise
647 static int iort_dev_find_its_id(struct device *dev, u32 id,
648 unsigned int idx, int *its_id)
650 struct acpi_iort_its_group *its;
651 struct acpi_iort_node *node;
653 node = iort_find_dev_node(dev);
657 node = iort_node_map_id(node, id, NULL, IORT_MSI_TYPE);
661 /* Move to ITS specific data */
662 its = (struct acpi_iort_its_group *)node->node_data;
663 if (idx >= its->its_count) {
664 dev_err(dev, "requested ITS ID index [%d] overruns ITS entries [%d]\n",
665 idx, its->its_count);
669 *its_id = its->identifiers[idx];
674 * iort_get_device_domain() - Find MSI domain related to a device
676 * @id: Requester ID for the device.
677 * @bus_token: irq domain bus token.
679 * Returns: the MSI domain for this device, NULL otherwise
681 struct irq_domain *iort_get_device_domain(struct device *dev, u32 id,
682 enum irq_domain_bus_token bus_token)
684 struct fwnode_handle *handle;
687 if (iort_dev_find_its_id(dev, id, 0, &its_id))
690 handle = iort_find_domain_token(its_id);
694 return irq_find_matching_fwnode(handle, bus_token);
697 static void iort_set_device_domain(struct device *dev,
698 struct acpi_iort_node *node)
700 struct acpi_iort_its_group *its;
701 struct acpi_iort_node *msi_parent;
702 struct acpi_iort_id_mapping *map;
703 struct fwnode_handle *iort_fwnode;
704 struct irq_domain *domain;
707 index = iort_get_id_mapping_index(node);
711 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
712 node->mapping_offset + index * sizeof(*map));
715 if (!map->output_reference ||
716 !(map->flags & ACPI_IORT_ID_SINGLE_MAPPING)) {
717 pr_err(FW_BUG "[node %p type %d] Invalid MSI mapping\n",
722 msi_parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
723 map->output_reference);
725 if (!msi_parent || msi_parent->type != ACPI_IORT_NODE_ITS_GROUP)
728 /* Move to ITS specific data */
729 its = (struct acpi_iort_its_group *)msi_parent->node_data;
731 iort_fwnode = iort_find_domain_token(its->identifiers[0]);
735 domain = irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
737 dev_set_msi_domain(dev, domain);
741 * iort_get_platform_device_domain() - Find MSI domain related to a
743 * @dev: the dev pointer associated with the platform device
745 * Returns: the MSI domain for this device, NULL otherwise
747 static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
749 struct acpi_iort_node *node, *msi_parent = NULL;
750 struct fwnode_handle *iort_fwnode;
751 struct acpi_iort_its_group *its;
754 /* find its associated iort node */
755 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
756 iort_match_node_callback, dev);
760 /* then find its msi parent node */
761 for (i = 0; i < node->mapping_count; i++) {
762 msi_parent = iort_node_map_platform_id(node, NULL,
771 /* Move to ITS specific data */
772 its = (struct acpi_iort_its_group *)msi_parent->node_data;
774 iort_fwnode = iort_find_domain_token(its->identifiers[0]);
778 return irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
781 void acpi_configure_pmsi_domain(struct device *dev)
783 struct irq_domain *msi_domain;
785 msi_domain = iort_get_platform_device_domain(dev);
787 dev_set_msi_domain(dev, msi_domain);
790 #ifdef CONFIG_IOMMU_API
791 static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev)
793 struct acpi_iort_node *iommu;
794 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
796 iommu = iort_get_iort_node(fwspec->iommu_fwnode);
798 if (iommu && (iommu->type == ACPI_IORT_NODE_SMMU_V3)) {
799 struct acpi_iort_smmu_v3 *smmu;
801 smmu = (struct acpi_iort_smmu_v3 *)iommu->node_data;
802 if (smmu->model == ACPI_IORT_SMMU_V3_HISILICON_HI161X)
809 static inline const struct iommu_ops *iort_fwspec_iommu_ops(struct device *dev)
811 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
813 return (fwspec && fwspec->ops) ? fwspec->ops : NULL;
816 static inline int iort_add_device_replay(struct device *dev)
820 if (dev->bus && !device_iommu_mapped(dev))
821 err = iommu_probe_device(dev);
827 * iort_iommu_msi_get_resv_regions - Reserved region driver helper
828 * @dev: Device from iommu_get_resv_regions()
829 * @head: Reserved region list from iommu_get_resv_regions()
831 * Returns: Number of msi reserved regions on success (0 if platform
832 * doesn't require the reservation or no associated msi regions),
833 * appropriate error value otherwise. The ITS interrupt translation
834 * spaces (ITS_base + SZ_64K, SZ_64K) associated with the device
835 * are the msi reserved regions.
837 int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
839 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
840 struct acpi_iort_its_group *its;
841 struct acpi_iort_node *iommu_node, *its_node = NULL;
844 iommu_node = iort_get_msi_resv_iommu(dev);
849 * Current logic to reserve ITS regions relies on HW topologies
850 * where a given PCI or named component maps its IDs to only one
851 * ITS group; if a PCI or named component can map its IDs to
852 * different ITS groups through IORT mappings this function has
853 * to be reworked to ensure we reserve regions for all ITS groups
854 * a given PCI or named component may map IDs to.
857 for (i = 0; i < fwspec->num_ids; i++) {
858 its_node = iort_node_map_id(iommu_node,
860 NULL, IORT_MSI_TYPE);
868 /* Move to ITS specific data */
869 its = (struct acpi_iort_its_group *)its_node->node_data;
871 for (i = 0; i < its->its_count; i++) {
874 if (!iort_find_its_base(its->identifiers[i], &base)) {
875 int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
876 struct iommu_resv_region *region;
878 region = iommu_alloc_resv_region(base + SZ_64K, SZ_64K,
879 prot, IOMMU_RESV_MSI);
881 list_add_tail(®ion->list, head);
887 return (resv == its->its_count) ? resv : -ENODEV;
890 static inline bool iort_iommu_driver_enabled(u8 type)
893 case ACPI_IORT_NODE_SMMU_V3:
894 return IS_ENABLED(CONFIG_ARM_SMMU_V3);
895 case ACPI_IORT_NODE_SMMU:
896 return IS_ENABLED(CONFIG_ARM_SMMU);
898 pr_warn("IORT node type %u does not describe an SMMU\n", type);
903 static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
904 struct fwnode_handle *fwnode,
905 const struct iommu_ops *ops)
907 int ret = iommu_fwspec_init(dev, fwnode, ops);
910 ret = iommu_fwspec_add_ids(dev, &streamid, 1);
915 static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node)
917 struct acpi_iort_root_complex *pci_rc;
919 pci_rc = (struct acpi_iort_root_complex *)node->node_data;
920 return pci_rc->ats_attribute & ACPI_IORT_ATS_SUPPORTED;
923 static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
926 const struct iommu_ops *ops;
927 struct fwnode_handle *iort_fwnode;
932 iort_fwnode = iort_get_fwnode(node);
937 * If the ops look-up fails, this means that either
938 * the SMMU drivers have not been probed yet or that
939 * the SMMU drivers are not built in the kernel;
940 * Depending on whether the SMMU drivers are built-in
941 * in the kernel or not, defer the IOMMU configuration
944 ops = iommu_ops_from_fwnode(iort_fwnode);
946 return iort_iommu_driver_enabled(node->type) ?
947 -EPROBE_DEFER : -ENODEV;
949 return arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
952 struct iort_pci_alias_info {
954 struct acpi_iort_node *node;
957 static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
959 struct iort_pci_alias_info *info = data;
960 struct acpi_iort_node *parent;
963 parent = iort_node_map_id(info->node, alias, &streamid,
965 return iort_iommu_xlate(info->dev, parent, streamid);
968 static void iort_named_component_init(struct device *dev,
969 struct acpi_iort_node *node)
971 struct acpi_iort_named_component *nc;
972 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
977 nc = (struct acpi_iort_named_component *)node->node_data;
978 fwspec->num_pasid_bits = FIELD_GET(ACPI_IORT_NC_PASID_BITS,
982 static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node)
984 struct acpi_iort_node *parent;
985 int err = -ENODEV, i = 0;
990 parent = iort_node_map_platform_id(node, &streamid,
995 err = iort_iommu_xlate(dev, parent, streamid);
996 } while (parent && !err);
1001 static int iort_nc_iommu_map_id(struct device *dev,
1002 struct acpi_iort_node *node,
1005 struct acpi_iort_node *parent;
1008 parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE);
1010 return iort_iommu_xlate(dev, parent, streamid);
1017 * iort_iommu_configure_id - Set-up IOMMU configuration for a device.
1019 * @dev: device to configure
1020 * @id_in: optional input id const value pointer
1022 * Returns: iommu_ops pointer on configuration success
1023 * NULL on configuration failure
1025 const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
1028 struct acpi_iort_node *node;
1029 const struct iommu_ops *ops;
1033 * If we already translated the fwspec there
1034 * is nothing left to do, return the iommu_ops.
1036 ops = iort_fwspec_iommu_ops(dev);
1040 if (dev_is_pci(dev)) {
1041 struct iommu_fwspec *fwspec;
1042 struct pci_bus *bus = to_pci_dev(dev)->bus;
1043 struct iort_pci_alias_info info = { .dev = dev };
1045 node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
1046 iort_match_node_callback, &bus->dev);
1051 err = pci_for_each_dma_alias(to_pci_dev(dev),
1052 iort_pci_iommu_init, &info);
1054 fwspec = dev_iommu_fwspec_get(dev);
1055 if (fwspec && iort_pci_rc_supports_ats(node))
1056 fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
1058 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
1059 iort_match_node_callback, dev);
1063 err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) :
1064 iort_nc_iommu_map(dev, node);
1067 iort_named_component_init(dev, node);
1071 * If we have reason to believe the IOMMU driver missed the initial
1072 * add_device callback for dev, replay it to get things in order.
1075 ops = iort_fwspec_iommu_ops(dev);
1076 err = iort_add_device_replay(dev);
1079 /* Ignore all other errors apart from EPROBE_DEFER */
1080 if (err == -EPROBE_DEFER) {
1083 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1091 int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
1093 const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
1094 const u32 *input_id)
1098 static int nc_dma_get_range(struct device *dev, u64 *size)
1100 struct acpi_iort_node *node;
1101 struct acpi_iort_named_component *ncomp;
1103 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
1104 iort_match_node_callback, dev);
1108 ncomp = (struct acpi_iort_named_component *)node->node_data;
1110 if (!ncomp->memory_address_limit) {
1111 pr_warn(FW_BUG "Named component missing memory address limit\n");
1115 *size = ncomp->memory_address_limit >= 64 ? U64_MAX :
1116 1ULL<<ncomp->memory_address_limit;
1121 static int rc_dma_get_range(struct device *dev, u64 *size)
1123 struct acpi_iort_node *node;
1124 struct acpi_iort_root_complex *rc;
1125 struct pci_bus *pbus = to_pci_dev(dev)->bus;
1127 node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
1128 iort_match_node_callback, &pbus->dev);
1129 if (!node || node->revision < 1)
1132 rc = (struct acpi_iort_root_complex *)node->node_data;
1134 if (!rc->memory_address_limit) {
1135 pr_warn(FW_BUG "Root complex missing memory address limit\n");
1139 *size = rc->memory_address_limit >= 64 ? U64_MAX :
1140 1ULL<<rc->memory_address_limit;
1146 * iort_dma_setup() - Set-up device DMA parameters.
1148 * @dev: device to configure
1149 * @dma_addr: device DMA address result pointer
1150 * @dma_size: DMA range size result pointer
1152 void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
1154 u64 end, mask, dmaaddr = 0, size = 0, offset = 0;
1158 * If @dev is expected to be DMA-capable then the bus code that created
1159 * it should have initialised its dma_mask pointer by this point. For
1160 * now, we'll continue the legacy behaviour of coercing it to the
1161 * coherent mask if not, but we'll no longer do so quietly.
1163 if (!dev->dma_mask) {
1164 dev_warn(dev, "DMA mask not set\n");
1165 dev->dma_mask = &dev->coherent_dma_mask;
1168 if (dev->coherent_dma_mask)
1169 size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
1173 ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size);
1175 ret = dev_is_pci(dev) ? rc_dma_get_range(dev, &size)
1176 : nc_dma_get_range(dev, &size);
1180 * Limit coherent and dma mask based on size retrieved from
1183 end = dmaaddr + size - 1;
1184 mask = DMA_BIT_MASK(ilog2(end) + 1);
1185 dev->bus_dma_limit = end;
1186 dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
1187 *dev->dma_mask = min(*dev->dma_mask, mask);
1190 *dma_addr = dmaaddr;
1193 ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size);
1195 dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : "");
1198 static void __init acpi_iort_register_irq(int hwirq, const char *name,
1200 struct resource *res)
1202 int irq = acpi_register_gsi(NULL, hwirq, trigger,
1206 pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,
1213 res->flags = IORESOURCE_IRQ;
1217 static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)
1219 struct acpi_iort_smmu_v3 *smmu;
1220 /* Always present mem resource */
1223 /* Retrieve SMMUv3 specific data */
1224 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
1226 if (smmu->event_gsiv)
1232 if (smmu->gerr_gsiv)
1235 if (smmu->sync_gsiv)
1241 static bool arm_smmu_v3_is_combined_irq(struct acpi_iort_smmu_v3 *smmu)
1244 * Cavium ThunderX2 implementation doesn't not support unique
1245 * irq line. Use single irq line for all the SMMUv3 interrupts.
1247 if (smmu->model != ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
1251 * ThunderX2 doesn't support MSIs from the SMMU, so we're checking
1254 return smmu->event_gsiv == smmu->pri_gsiv &&
1255 smmu->event_gsiv == smmu->gerr_gsiv &&
1256 smmu->event_gsiv == smmu->sync_gsiv;
1259 static unsigned long arm_smmu_v3_resource_size(struct acpi_iort_smmu_v3 *smmu)
1262 * Override the size, for Cavium ThunderX2 implementation
1263 * which doesn't support the page 1 SMMU register space.
1265 if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
1271 static void __init arm_smmu_v3_init_resources(struct resource *res,
1272 struct acpi_iort_node *node)
1274 struct acpi_iort_smmu_v3 *smmu;
1277 /* Retrieve SMMUv3 specific data */
1278 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
1280 res[num_res].start = smmu->base_address;
1281 res[num_res].end = smmu->base_address +
1282 arm_smmu_v3_resource_size(smmu) - 1;
1283 res[num_res].flags = IORESOURCE_MEM;
1286 if (arm_smmu_v3_is_combined_irq(smmu)) {
1287 if (smmu->event_gsiv)
1288 acpi_iort_register_irq(smmu->event_gsiv, "combined",
1289 ACPI_EDGE_SENSITIVE,
1293 if (smmu->event_gsiv)
1294 acpi_iort_register_irq(smmu->event_gsiv, "eventq",
1295 ACPI_EDGE_SENSITIVE,
1299 acpi_iort_register_irq(smmu->pri_gsiv, "priq",
1300 ACPI_EDGE_SENSITIVE,
1303 if (smmu->gerr_gsiv)
1304 acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",
1305 ACPI_EDGE_SENSITIVE,
1308 if (smmu->sync_gsiv)
1309 acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",
1310 ACPI_EDGE_SENSITIVE,
1315 static void __init arm_smmu_v3_dma_configure(struct device *dev,
1316 struct acpi_iort_node *node)
1318 struct acpi_iort_smmu_v3 *smmu;
1319 enum dev_dma_attr attr;
1321 /* Retrieve SMMUv3 specific data */
1322 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
1324 attr = (smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE) ?
1325 DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
1327 /* We expect the dma masks to be equivalent for all SMMUv3 set-ups */
1328 dev->dma_mask = &dev->coherent_dma_mask;
1330 /* Configure DMA for the page table walker */
1331 acpi_dma_configure(dev, attr);
1334 #if defined(CONFIG_ACPI_NUMA)
1336 * set numa proximity domain for smmuv3 device
1338 static int __init arm_smmu_v3_set_proximity(struct device *dev,
1339 struct acpi_iort_node *node)
1341 struct acpi_iort_smmu_v3 *smmu;
1343 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
1344 if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
1345 int dev_node = pxm_to_node(smmu->pxm);
1347 if (dev_node != NUMA_NO_NODE && !node_online(dev_node))
1350 set_dev_node(dev, dev_node);
1351 pr_info("SMMU-v3[%llx] Mapped to Proximity domain %d\n",
1358 #define arm_smmu_v3_set_proximity NULL
1361 static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
1363 struct acpi_iort_smmu *smmu;
1365 /* Retrieve SMMU specific data */
1366 smmu = (struct acpi_iort_smmu *)node->node_data;
1369 * Only consider the global fault interrupt and ignore the
1370 * configuration access interrupt.
1372 * MMIO address and global fault interrupt resources are always
1373 * present so add them to the context interrupt count as a static
1376 return smmu->context_interrupt_count + 2;
1379 static void __init arm_smmu_init_resources(struct resource *res,
1380 struct acpi_iort_node *node)
1382 struct acpi_iort_smmu *smmu;
1383 int i, hw_irq, trigger, num_res = 0;
1384 u64 *ctx_irq, *glb_irq;
1386 /* Retrieve SMMU specific data */
1387 smmu = (struct acpi_iort_smmu *)node->node_data;
1389 res[num_res].start = smmu->base_address;
1390 res[num_res].end = smmu->base_address + smmu->span - 1;
1391 res[num_res].flags = IORESOURCE_MEM;
1394 glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
1396 hw_irq = IORT_IRQ_MASK(glb_irq[0]);
1397 trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);
1399 acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
1403 ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
1404 for (i = 0; i < smmu->context_interrupt_count; i++) {
1405 hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
1406 trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);
1408 acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
1413 static void __init arm_smmu_dma_configure(struct device *dev,
1414 struct acpi_iort_node *node)
1416 struct acpi_iort_smmu *smmu;
1417 enum dev_dma_attr attr;
1419 /* Retrieve SMMU specific data */
1420 smmu = (struct acpi_iort_smmu *)node->node_data;
1422 attr = (smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK) ?
1423 DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
1425 /* We expect the dma masks to be equivalent for SMMU set-ups */
1426 dev->dma_mask = &dev->coherent_dma_mask;
1428 /* Configure DMA for the page table walker */
1429 acpi_dma_configure(dev, attr);
1432 static int __init arm_smmu_v3_pmcg_count_resources(struct acpi_iort_node *node)
1434 struct acpi_iort_pmcg *pmcg;
1436 /* Retrieve PMCG specific data */
1437 pmcg = (struct acpi_iort_pmcg *)node->node_data;
1440 * There are always 2 memory resources.
1441 * If the overflow_gsiv is present then add that for a total of 3.
1443 return pmcg->overflow_gsiv ? 3 : 2;
1446 static void __init arm_smmu_v3_pmcg_init_resources(struct resource *res,
1447 struct acpi_iort_node *node)
1449 struct acpi_iort_pmcg *pmcg;
1451 /* Retrieve PMCG specific data */
1452 pmcg = (struct acpi_iort_pmcg *)node->node_data;
1454 res[0].start = pmcg->page0_base_address;
1455 res[0].end = pmcg->page0_base_address + SZ_4K - 1;
1456 res[0].flags = IORESOURCE_MEM;
1458 * The initial version in DEN0049C lacked a way to describe register
1459 * page 1, which makes it broken for most PMCG implementations; in
1460 * that case, just let the driver fail gracefully if it expects to
1461 * find a second memory resource.
1463 if (node->revision > 0) {
1464 res[1].start = pmcg->page1_base_address;
1465 res[1].end = pmcg->page1_base_address + SZ_4K - 1;
1466 res[1].flags = IORESOURCE_MEM;
1469 if (pmcg->overflow_gsiv)
1470 acpi_iort_register_irq(pmcg->overflow_gsiv, "overflow",
1471 ACPI_EDGE_SENSITIVE, &res[2]);
1474 static struct acpi_platform_list pmcg_plat_info[] __initdata = {
1475 /* HiSilicon Hip08 Platform */
1476 {"HISI ", "HIP08 ", 0, ACPI_SIG_IORT, greater_than_or_equal,
1477 "Erratum #162001800, Erratum #162001900", IORT_SMMU_V3_PMCG_HISI_HIP08},
1478 /* HiSilicon Hip09 Platform */
1479 {"HISI ", "HIP09 ", 0, ACPI_SIG_IORT, greater_than_or_equal,
1480 "Erratum #162001900", IORT_SMMU_V3_PMCG_HISI_HIP09},
1484 static int __init arm_smmu_v3_pmcg_add_platdata(struct platform_device *pdev)
1489 idx = acpi_match_platform_list(pmcg_plat_info);
1491 model = pmcg_plat_info[idx].data;
1493 model = IORT_SMMU_V3_PMCG_GENERIC;
1495 return platform_device_add_data(pdev, &model, sizeof(model));
1498 struct iort_dev_config {
1500 int (*dev_init)(struct acpi_iort_node *node);
1501 void (*dev_dma_configure)(struct device *dev,
1502 struct acpi_iort_node *node);
1503 int (*dev_count_resources)(struct acpi_iort_node *node);
1504 void (*dev_init_resources)(struct resource *res,
1505 struct acpi_iort_node *node);
1506 int (*dev_set_proximity)(struct device *dev,
1507 struct acpi_iort_node *node);
1508 int (*dev_add_platdata)(struct platform_device *pdev);
1511 static const struct iort_dev_config iort_arm_smmu_v3_cfg __initconst = {
1512 .name = "arm-smmu-v3",
1513 .dev_dma_configure = arm_smmu_v3_dma_configure,
1514 .dev_count_resources = arm_smmu_v3_count_resources,
1515 .dev_init_resources = arm_smmu_v3_init_resources,
1516 .dev_set_proximity = arm_smmu_v3_set_proximity,
1519 static const struct iort_dev_config iort_arm_smmu_cfg __initconst = {
1521 .dev_dma_configure = arm_smmu_dma_configure,
1522 .dev_count_resources = arm_smmu_count_resources,
1523 .dev_init_resources = arm_smmu_init_resources,
1526 static const struct iort_dev_config iort_arm_smmu_v3_pmcg_cfg __initconst = {
1527 .name = "arm-smmu-v3-pmcg",
1528 .dev_count_resources = arm_smmu_v3_pmcg_count_resources,
1529 .dev_init_resources = arm_smmu_v3_pmcg_init_resources,
1530 .dev_add_platdata = arm_smmu_v3_pmcg_add_platdata,
1533 static __init const struct iort_dev_config *iort_get_dev_cfg(
1534 struct acpi_iort_node *node)
1536 switch (node->type) {
1537 case ACPI_IORT_NODE_SMMU_V3:
1538 return &iort_arm_smmu_v3_cfg;
1539 case ACPI_IORT_NODE_SMMU:
1540 return &iort_arm_smmu_cfg;
1541 case ACPI_IORT_NODE_PMCG:
1542 return &iort_arm_smmu_v3_pmcg_cfg;
1549 * iort_add_platform_device() - Allocate a platform device for IORT node
1550 * @node: Pointer to device ACPI IORT node
1551 * @ops: Pointer to IORT device config struct
1553 * Returns: 0 on success, <0 failure
1555 static int __init iort_add_platform_device(struct acpi_iort_node *node,
1556 const struct iort_dev_config *ops)
1558 struct fwnode_handle *fwnode;
1559 struct platform_device *pdev;
1563 pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
1567 if (ops->dev_set_proximity) {
1568 ret = ops->dev_set_proximity(&pdev->dev, node);
1573 count = ops->dev_count_resources(node);
1575 r = kcalloc(count, sizeof(*r), GFP_KERNEL);
1581 ops->dev_init_resources(r, node);
1583 ret = platform_device_add_resources(pdev, r, count);
1585 * Resources are duplicated in platform_device_add_resources,
1586 * free their allocated memory
1594 * Platform devices based on PMCG nodes uses platform_data to
1595 * pass the hardware model info to the driver. For others, add
1596 * a copy of IORT node pointer to platform_data to be used to
1597 * retrieve IORT data information.
1599 if (ops->dev_add_platdata)
1600 ret = ops->dev_add_platdata(pdev);
1602 ret = platform_device_add_data(pdev, &node, sizeof(node));
1607 fwnode = iort_get_fwnode(node);
1614 pdev->dev.fwnode = fwnode;
1616 if (ops->dev_dma_configure)
1617 ops->dev_dma_configure(&pdev->dev, node);
1619 iort_set_device_domain(&pdev->dev, node);
1621 ret = platform_device_add(pdev);
1623 goto dma_deconfigure;
1628 arch_teardown_dma_ops(&pdev->dev);
1630 platform_device_put(pdev);
1636 static void __init iort_enable_acs(struct acpi_iort_node *iort_node)
1638 static bool acs_enabled __initdata;
1643 if (iort_node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
1644 struct acpi_iort_node *parent;
1645 struct acpi_iort_id_mapping *map;
1648 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, iort_node,
1649 iort_node->mapping_offset);
1651 for (i = 0; i < iort_node->mapping_count; i++, map++) {
1652 if (!map->output_reference)
1655 parent = ACPI_ADD_PTR(struct acpi_iort_node,
1656 iort_table, map->output_reference);
1658 * If we detect a RC->SMMU mapping, make sure
1659 * we enable ACS on the system.
1661 if ((parent->type == ACPI_IORT_NODE_SMMU) ||
1662 (parent->type == ACPI_IORT_NODE_SMMU_V3)) {
1671 static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { }
1674 static void __init iort_init_platform_devices(void)
1676 struct acpi_iort_node *iort_node, *iort_end;
1677 struct acpi_table_iort *iort;
1678 struct fwnode_handle *fwnode;
1680 const struct iort_dev_config *ops;
1683 * iort_table and iort both point to the start of IORT table, but
1684 * have different struct types
1686 iort = (struct acpi_table_iort *)iort_table;
1688 /* Get the first IORT node */
1689 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
1691 iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort,
1692 iort_table->length);
1694 for (i = 0; i < iort->node_count; i++) {
1695 if (iort_node >= iort_end) {
1696 pr_err("iort node pointer overflows, bad table\n");
1700 iort_enable_acs(iort_node);
1702 ops = iort_get_dev_cfg(iort_node);
1704 fwnode = acpi_alloc_fwnode_static();
1708 iort_set_fwnode(iort_node, fwnode);
1710 ret = iort_add_platform_device(iort_node, ops);
1712 iort_delete_fwnode(iort_node);
1713 acpi_free_fwnode_static(fwnode);
1718 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
1723 void __init acpi_iort_init(void)
1727 /* iort_table will be used at runtime after the iort init,
1728 * so we don't need to call acpi_put_table() to release
1729 * the IORT table mapping.
1731 status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
1732 if (ACPI_FAILURE(status)) {
1733 if (status != AE_NOT_FOUND) {
1734 const char *msg = acpi_format_exception(status);
1736 pr_err("Failed to get table, %s\n", msg);
1742 iort_init_platform_devices();
1745 #ifdef CONFIG_ZONE_DMA
1747 * Extract the highest CPU physical address accessible to all DMA masters in
1748 * the system. PHYS_ADDR_MAX is returned when no constrained device is found.
1750 phys_addr_t __init acpi_iort_dma_get_max_cpu_address(void)
1752 phys_addr_t limit = PHYS_ADDR_MAX;
1753 struct acpi_iort_node *node, *end;
1754 struct acpi_table_iort *iort;
1761 status = acpi_get_table(ACPI_SIG_IORT, 0,
1762 (struct acpi_table_header **)&iort);
1763 if (ACPI_FAILURE(status))
1766 node = ACPI_ADD_PTR(struct acpi_iort_node, iort, iort->node_offset);
1767 end = ACPI_ADD_PTR(struct acpi_iort_node, iort, iort->header.length);
1769 for (i = 0; i < iort->node_count; i++) {
1773 switch (node->type) {
1774 struct acpi_iort_named_component *ncomp;
1775 struct acpi_iort_root_complex *rc;
1776 phys_addr_t local_limit;
1778 case ACPI_IORT_NODE_NAMED_COMPONENT:
1779 ncomp = (struct acpi_iort_named_component *)node->node_data;
1780 local_limit = DMA_BIT_MASK(ncomp->memory_address_limit);
1781 limit = min_not_zero(limit, local_limit);
1784 case ACPI_IORT_NODE_PCI_ROOT_COMPLEX:
1785 if (node->revision < 1)
1788 rc = (struct acpi_iort_root_complex *)node->node_data;
1789 local_limit = DMA_BIT_MASK(rc->memory_address_limit);
1790 limit = min_not_zero(limit, local_limit);
1793 node = ACPI_ADD_PTR(struct acpi_iort_node, node, node->length);
1795 acpi_put_table(&iort->header);