2 * Copyright (C) 2016, Semihalf
3 * Author: Tomasz Nowicki <tn@semihalf.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * This file implements early detection/parsing of I/O mapping
15 * reported to OS through firmware via I/O Remapping Table (IORT)
16 * IORT document number: ARM DEN 0049A
19 #define pr_fmt(fmt) "ACPI: IORT: " fmt
21 #include <linux/acpi_iort.h>
22 #include <linux/iommu.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/pci.h>
26 #include <linux/platform_device.h>
27 #include <linux/slab.h>
29 #define IORT_TYPE_MASK(type) (1 << (type))
30 #define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP)
31 #define IORT_IOMMU_TYPE ((1 << ACPI_IORT_NODE_SMMU) | \
32 (1 << ACPI_IORT_NODE_SMMU_V3))
34 struct iort_its_msi_chip {
35 struct list_head list;
36 struct fwnode_handle *fw_node;
41 struct list_head list;
42 struct acpi_iort_node *iort_node;
43 struct fwnode_handle *fwnode;
45 static LIST_HEAD(iort_fwnode_list);
46 static DEFINE_SPINLOCK(iort_fwnode_lock);
49 * iort_set_fwnode() - Create iort_fwnode and use it to register
50 * iommu data in the iort_fwnode_list
52 * @node: IORT table node associated with the IOMMU
53 * @fwnode: fwnode associated with the IORT node
55 * Returns: 0 on success
58 static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
59 struct fwnode_handle *fwnode)
61 struct iort_fwnode *np;
63 np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC);
68 INIT_LIST_HEAD(&np->list);
69 np->iort_node = iort_node;
72 spin_lock(&iort_fwnode_lock);
73 list_add_tail(&np->list, &iort_fwnode_list);
74 spin_unlock(&iort_fwnode_lock);
80 * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
82 * @node: IORT table node to be looked-up
84 * Returns: fwnode_handle pointer on success, NULL on failure
87 struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node)
89 struct iort_fwnode *curr;
90 struct fwnode_handle *fwnode = NULL;
92 spin_lock(&iort_fwnode_lock);
93 list_for_each_entry(curr, &iort_fwnode_list, list) {
94 if (curr->iort_node == node) {
95 fwnode = curr->fwnode;
99 spin_unlock(&iort_fwnode_lock);
105 * iort_delete_fwnode() - Delete fwnode associated with an IORT node
107 * @node: IORT table node associated with fwnode to delete
109 static inline void iort_delete_fwnode(struct acpi_iort_node *node)
111 struct iort_fwnode *curr, *tmp;
113 spin_lock(&iort_fwnode_lock);
114 list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list) {
115 if (curr->iort_node == node) {
116 list_del(&curr->list);
121 spin_unlock(&iort_fwnode_lock);
124 typedef acpi_status (*iort_find_node_callback)
125 (struct acpi_iort_node *node, void *context);
127 /* Root pointer to the mapped IORT table */
128 static struct acpi_table_header *iort_table;
130 static LIST_HEAD(iort_msi_chip_list);
131 static DEFINE_SPINLOCK(iort_msi_chip_lock);
134 * iort_register_domain_token() - register domain token and related ITS ID
135 * to the list from where we can get it back later on.
137 * @fw_node: Domain token.
139 * Returns: 0 on success, -ENOMEM if no memory when allocating list element
141 int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node)
143 struct iort_its_msi_chip *its_msi_chip;
145 its_msi_chip = kzalloc(sizeof(*its_msi_chip), GFP_KERNEL);
149 its_msi_chip->fw_node = fw_node;
150 its_msi_chip->translation_id = trans_id;
152 spin_lock(&iort_msi_chip_lock);
153 list_add(&its_msi_chip->list, &iort_msi_chip_list);
154 spin_unlock(&iort_msi_chip_lock);
160 * iort_deregister_domain_token() - Deregister domain token based on ITS ID
165 void iort_deregister_domain_token(int trans_id)
167 struct iort_its_msi_chip *its_msi_chip, *t;
169 spin_lock(&iort_msi_chip_lock);
170 list_for_each_entry_safe(its_msi_chip, t, &iort_msi_chip_list, list) {
171 if (its_msi_chip->translation_id == trans_id) {
172 list_del(&its_msi_chip->list);
177 spin_unlock(&iort_msi_chip_lock);
181 * iort_find_domain_token() - Find domain token based on given ITS ID
184 * Returns: domain token when find on the list, NULL otherwise
186 struct fwnode_handle *iort_find_domain_token(int trans_id)
188 struct fwnode_handle *fw_node = NULL;
189 struct iort_its_msi_chip *its_msi_chip;
191 spin_lock(&iort_msi_chip_lock);
192 list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
193 if (its_msi_chip->translation_id == trans_id) {
194 fw_node = its_msi_chip->fw_node;
198 spin_unlock(&iort_msi_chip_lock);
203 static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
204 iort_find_node_callback callback,
207 struct acpi_iort_node *iort_node, *iort_end;
208 struct acpi_table_iort *iort;
214 /* Get the first IORT node */
215 iort = (struct acpi_table_iort *)iort_table;
216 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
218 iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
221 for (i = 0; i < iort->node_count; i++) {
222 if (WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND,
223 "IORT node pointer overflows, bad table!\n"))
226 if (iort_node->type == type &&
227 ACPI_SUCCESS(callback(iort_node, context)))
230 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
238 iort_match_type_callback(struct acpi_iort_node *node, void *context)
243 bool iort_node_match(u8 type)
245 struct acpi_iort_node *node;
247 node = iort_scan_node(type, iort_match_type_callback, NULL);
252 static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
255 struct device *dev = context;
256 acpi_status status = AE_NOT_FOUND;
258 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
259 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
260 struct acpi_device *adev = to_acpi_device_node(dev->fwnode);
261 struct acpi_iort_named_component *ncomp;
266 status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
267 if (ACPI_FAILURE(status)) {
268 dev_warn(dev, "Can't get device full path name\n");
272 ncomp = (struct acpi_iort_named_component *)node->node_data;
273 status = !strcmp(ncomp->device_name, buf.pointer) ?
274 AE_OK : AE_NOT_FOUND;
275 acpi_os_free(buf.pointer);
276 } else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
277 struct acpi_iort_root_complex *pci_rc;
280 bus = to_pci_bus(dev);
281 pci_rc = (struct acpi_iort_root_complex *)node->node_data;
284 * It is assumed that PCI segment numbers maps one-to-one
285 * with root complexes. Each segment number can represent only
288 status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
289 AE_OK : AE_NOT_FOUND;
295 static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
298 /* Single mapping does not care for input id */
299 if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
300 if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
301 type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
302 *rid_out = map->output_base;
306 pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
311 if (rid_in < map->input_base ||
312 (rid_in >= map->input_base + map->id_count))
315 *rid_out = map->output_base + (rid_in - map->input_base);
320 struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
321 u32 *id_out, int index)
323 struct acpi_iort_node *parent;
324 struct acpi_iort_id_mapping *map;
326 if (!node->mapping_offset || !node->mapping_count ||
327 index >= node->mapping_count)
330 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
331 node->mapping_offset + index * sizeof(*map));
334 if (!map->output_reference) {
335 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
340 parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
341 map->output_reference);
343 if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
344 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
345 node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
346 *id_out = map->output_base;
354 static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
355 u32 id_in, u32 *id_out,
360 /* Parse the ID mapping tree to find specified node type */
362 struct acpi_iort_id_mapping *map;
365 if (IORT_TYPE_MASK(node->type) & type_mask) {
371 if (!node->mapping_offset || !node->mapping_count)
374 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
375 node->mapping_offset);
378 if (!map->output_reference) {
379 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
384 /* Do the ID translation */
385 for (i = 0; i < node->mapping_count; i++, map++) {
386 if (!iort_id_map(map, node->type, id, &id))
390 if (i == node->mapping_count)
393 node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
394 map->output_reference);
398 /* Map input ID to output ID unchanged on mapping failure */
406 struct acpi_iort_node *iort_node_map_platform_id(struct acpi_iort_node *node,
407 u32 *id_out, u8 type_mask,
410 struct acpi_iort_node *parent;
413 /* step 1: retrieve the initial dev id */
414 parent = iort_node_get_id(node, &id, index);
419 * optional step 2: map the initial dev id if its parent is not
420 * the target type we want, map it again for the use cases such
421 * as NC (named component) -> SMMU -> ITS. If the type is matched,
422 * return the initial dev id and its parent pointer directly.
424 if (!(IORT_TYPE_MASK(parent->type) & type_mask))
425 parent = iort_node_map_id(parent, id, id_out, type_mask);
433 static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
435 struct pci_bus *pbus;
437 if (!dev_is_pci(dev))
438 return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
439 iort_match_node_callback, dev);
441 /* Find a PCI root bus */
442 pbus = to_pci_dev(dev)->bus;
443 while (!pci_is_root_bus(pbus))
446 return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
447 iort_match_node_callback, &pbus->dev);
451 * iort_msi_map_rid() - Map a MSI requester ID for a device
452 * @dev: The device for which the mapping is to be done.
453 * @req_id: The device requester ID.
455 * Returns: mapped MSI RID on success, input requester ID otherwise
457 u32 iort_msi_map_rid(struct device *dev, u32 req_id)
459 struct acpi_iort_node *node;
462 node = iort_find_dev_node(dev);
466 iort_node_map_id(node, req_id, &dev_id, IORT_MSI_TYPE);
471 * iort_pmsi_get_dev_id() - Get the device id for a device
472 * @dev: The device for which the mapping is to be done.
473 * @dev_id: The device ID found.
475 * Returns: 0 for successful find a dev id, -ENODEV on error
477 int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
480 struct acpi_iort_node *node;
482 node = iort_find_dev_node(dev);
486 for (i = 0; i < node->mapping_count; i++) {
487 if (iort_node_map_platform_id(node, dev_id, IORT_MSI_TYPE, i))
495 * iort_dev_find_its_id() - Find the ITS identifier for a device
497 * @req_id: Device's requester ID
498 * @idx: Index of the ITS identifier list.
499 * @its_id: ITS identifier.
501 * Returns: 0 on success, appropriate error value otherwise
503 static int iort_dev_find_its_id(struct device *dev, u32 req_id,
504 unsigned int idx, int *its_id)
506 struct acpi_iort_its_group *its;
507 struct acpi_iort_node *node;
509 node = iort_find_dev_node(dev);
513 node = iort_node_map_id(node, req_id, NULL, IORT_MSI_TYPE);
517 /* Move to ITS specific data */
518 its = (struct acpi_iort_its_group *)node->node_data;
519 if (idx > its->its_count) {
520 dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n",
521 idx, its->its_count);
525 *its_id = its->identifiers[idx];
530 * iort_get_device_domain() - Find MSI domain related to a device
532 * @req_id: Requester ID for the device.
534 * Returns: the MSI domain for this device, NULL otherwise
536 struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
538 struct fwnode_handle *handle;
541 if (iort_dev_find_its_id(dev, req_id, 0, &its_id))
544 handle = iort_find_domain_token(its_id);
548 return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
552 * iort_get_platform_device_domain() - Find MSI domain related to a
554 * @dev: the dev pointer associated with the platform device
556 * Returns: the MSI domain for this device, NULL otherwise
558 static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
560 struct acpi_iort_node *node, *msi_parent;
561 struct fwnode_handle *iort_fwnode;
562 struct acpi_iort_its_group *its;
565 /* find its associated iort node */
566 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
567 iort_match_node_callback, dev);
571 /* then find its msi parent node */
572 for (i = 0; i < node->mapping_count; i++) {
573 msi_parent = iort_node_map_platform_id(node, NULL,
582 /* Move to ITS specific data */
583 its = (struct acpi_iort_its_group *)msi_parent->node_data;
585 iort_fwnode = iort_find_domain_token(its->identifiers[0]);
589 return irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
592 void acpi_configure_pmsi_domain(struct device *dev)
594 struct irq_domain *msi_domain;
596 msi_domain = iort_get_platform_device_domain(dev);
598 dev_set_msi_domain(dev, msi_domain);
601 static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
609 static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
610 struct fwnode_handle *fwnode,
611 const struct iommu_ops *ops)
613 int ret = iommu_fwspec_init(dev, fwnode, ops);
616 ret = iommu_fwspec_add_ids(dev, &streamid, 1);
621 static inline bool iort_iommu_driver_enabled(u8 type)
624 case ACPI_IORT_NODE_SMMU_V3:
625 return IS_BUILTIN(CONFIG_ARM_SMMU_V3);
626 case ACPI_IORT_NODE_SMMU:
627 return IS_BUILTIN(CONFIG_ARM_SMMU);
629 pr_warn("IORT node type %u does not describe an SMMU\n", type);
634 #ifdef CONFIG_IOMMU_API
636 const struct iommu_ops *iort_fwspec_iommu_ops(struct iommu_fwspec *fwspec)
638 return (fwspec && fwspec->ops) ? fwspec->ops : NULL;
642 int iort_add_device_replay(const struct iommu_ops *ops, struct device *dev)
646 if (!IS_ERR_OR_NULL(ops) && ops->add_device && dev->bus &&
648 err = ops->add_device(dev);
654 const struct iommu_ops *iort_fwspec_iommu_ops(struct iommu_fwspec *fwspec)
657 int iort_add_device_replay(const struct iommu_ops *ops, struct device *dev)
661 static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
662 struct acpi_iort_node *node,
665 const struct iommu_ops *ops = NULL;
667 struct fwnode_handle *iort_fwnode;
670 iort_fwnode = iort_get_fwnode(node);
674 ops = iommu_ops_from_fwnode(iort_fwnode);
676 * If the ops look-up fails, this means that either
677 * the SMMU drivers have not been probed yet or that
678 * the SMMU drivers are not built in the kernel;
679 * Depending on whether the SMMU drivers are built-in
680 * in the kernel or not, defer the IOMMU configuration
684 return iort_iommu_driver_enabled(node->type) ?
685 ERR_PTR(-EPROBE_DEFER) : NULL;
687 ret = arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
690 return ret ? NULL : ops;
694 * iort_set_dma_mask - Set-up dma mask for a device.
696 * @dev: device to configure
698 void iort_set_dma_mask(struct device *dev)
701 * Set default coherent_dma_mask to 32 bit. Drivers are expected to
702 * setup the correct supported mask.
704 if (!dev->coherent_dma_mask)
705 dev->coherent_dma_mask = DMA_BIT_MASK(32);
708 * Set it to coherent_dma_mask by default if the architecture
709 * code has not set it.
712 dev->dma_mask = &dev->coherent_dma_mask;
716 * iort_iommu_configure - Set-up IOMMU configuration for a device.
718 * @dev: device to configure
720 * Returns: iommu_ops pointer on configuration success
721 * NULL on configuration failure
723 const struct iommu_ops *iort_iommu_configure(struct device *dev)
725 struct acpi_iort_node *node, *parent;
726 const struct iommu_ops *ops = NULL;
731 * If we already translated the fwspec there
732 * is nothing left to do, return the iommu_ops.
734 ops = iort_fwspec_iommu_ops(dev->iommu_fwspec);
738 if (dev_is_pci(dev)) {
739 struct pci_bus *bus = to_pci_dev(dev)->bus;
742 pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid,
745 node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
746 iort_match_node_callback, &bus->dev);
750 parent = iort_node_map_id(node, rid, &streamid,
753 ops = iort_iommu_xlate(dev, parent, streamid);
758 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
759 iort_match_node_callback, dev);
763 parent = iort_node_map_platform_id(node, &streamid,
764 IORT_IOMMU_TYPE, i++);
767 ops = iort_iommu_xlate(dev, parent, streamid);
768 if (IS_ERR_OR_NULL(ops))
771 parent = iort_node_map_platform_id(node, &streamid,
778 * If we have reason to believe the IOMMU driver missed the initial
779 * add_device callback for dev, replay it to get things in order.
781 err = iort_add_device_replay(ops, dev);
785 /* Ignore all other errors apart from EPROBE_DEFER */
786 if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) {
787 dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops));
794 static void __init acpi_iort_register_irq(int hwirq, const char *name,
796 struct resource *res)
798 int irq = acpi_register_gsi(NULL, hwirq, trigger,
802 pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,
809 res->flags = IORESOURCE_IRQ;
813 static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)
815 struct acpi_iort_smmu_v3 *smmu;
816 /* Always present mem resource */
819 /* Retrieve SMMUv3 specific data */
820 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
822 if (smmu->event_gsiv)
837 static void __init arm_smmu_v3_init_resources(struct resource *res,
838 struct acpi_iort_node *node)
840 struct acpi_iort_smmu_v3 *smmu;
843 /* Retrieve SMMUv3 specific data */
844 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
846 res[num_res].start = smmu->base_address;
847 res[num_res].end = smmu->base_address + SZ_128K - 1;
848 res[num_res].flags = IORESOURCE_MEM;
852 if (smmu->event_gsiv)
853 acpi_iort_register_irq(smmu->event_gsiv, "eventq",
858 acpi_iort_register_irq(smmu->pri_gsiv, "priq",
863 acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",
868 acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",
873 static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
875 struct acpi_iort_smmu_v3 *smmu;
877 /* Retrieve SMMUv3 specific data */
878 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
880 return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
883 static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
885 struct acpi_iort_smmu *smmu;
887 /* Retrieve SMMU specific data */
888 smmu = (struct acpi_iort_smmu *)node->node_data;
891 * Only consider the global fault interrupt and ignore the
892 * configuration access interrupt.
894 * MMIO address and global fault interrupt resources are always
895 * present so add them to the context interrupt count as a static
898 return smmu->context_interrupt_count + 2;
901 static void __init arm_smmu_init_resources(struct resource *res,
902 struct acpi_iort_node *node)
904 struct acpi_iort_smmu *smmu;
905 int i, hw_irq, trigger, num_res = 0;
906 u64 *ctx_irq, *glb_irq;
908 /* Retrieve SMMU specific data */
909 smmu = (struct acpi_iort_smmu *)node->node_data;
911 res[num_res].start = smmu->base_address;
912 res[num_res].end = smmu->base_address + smmu->span - 1;
913 res[num_res].flags = IORESOURCE_MEM;
916 glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
918 hw_irq = IORT_IRQ_MASK(glb_irq[0]);
919 trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);
921 acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
925 ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
926 for (i = 0; i < smmu->context_interrupt_count; i++) {
927 hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
928 trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);
930 acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
935 static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
937 struct acpi_iort_smmu *smmu;
939 /* Retrieve SMMU specific data */
940 smmu = (struct acpi_iort_smmu *)node->node_data;
942 return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
945 struct iort_iommu_config {
947 int (*iommu_init)(struct acpi_iort_node *node);
948 bool (*iommu_is_coherent)(struct acpi_iort_node *node);
949 int (*iommu_count_resources)(struct acpi_iort_node *node);
950 void (*iommu_init_resources)(struct resource *res,
951 struct acpi_iort_node *node);
954 static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
955 .name = "arm-smmu-v3",
956 .iommu_is_coherent = arm_smmu_v3_is_coherent,
957 .iommu_count_resources = arm_smmu_v3_count_resources,
958 .iommu_init_resources = arm_smmu_v3_init_resources
961 static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
963 .iommu_is_coherent = arm_smmu_is_coherent,
964 .iommu_count_resources = arm_smmu_count_resources,
965 .iommu_init_resources = arm_smmu_init_resources
969 const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
971 switch (node->type) {
972 case ACPI_IORT_NODE_SMMU_V3:
973 return &iort_arm_smmu_v3_cfg;
974 case ACPI_IORT_NODE_SMMU:
975 return &iort_arm_smmu_cfg;
982 * iort_add_smmu_platform_device() - Allocate a platform device for SMMU
983 * @node: Pointer to SMMU ACPI IORT node
985 * Returns: 0 on success, <0 failure
987 static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
989 struct fwnode_handle *fwnode;
990 struct platform_device *pdev;
992 enum dev_dma_attr attr;
994 const struct iort_iommu_config *ops = iort_get_iommu_cfg(node);
999 pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
1003 count = ops->iommu_count_resources(node);
1005 r = kcalloc(count, sizeof(*r), GFP_KERNEL);
1011 ops->iommu_init_resources(r, node);
1013 ret = platform_device_add_resources(pdev, r, count);
1015 * Resources are duplicated in platform_device_add_resources,
1016 * free their allocated memory
1024 * Add a copy of IORT node pointer to platform_data to
1025 * be used to retrieve IORT data information.
1027 ret = platform_device_add_data(pdev, &node, sizeof(node));
1032 * We expect the dma masks to be equivalent for
1035 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
1037 fwnode = iort_get_fwnode(node);
1044 pdev->dev.fwnode = fwnode;
1046 attr = ops->iommu_is_coherent(node) ?
1047 DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
1049 /* Configure DMA for the page table walker */
1050 acpi_dma_configure(&pdev->dev, attr);
1052 ret = platform_device_add(pdev);
1054 goto dma_deconfigure;
1059 acpi_dma_deconfigure(&pdev->dev);
1061 platform_device_put(pdev);
1066 static void __init iort_init_platform_devices(void)
1068 struct acpi_iort_node *iort_node, *iort_end;
1069 struct acpi_table_iort *iort;
1070 struct fwnode_handle *fwnode;
1074 * iort_table and iort both point to the start of IORT table, but
1075 * have different struct types
1077 iort = (struct acpi_table_iort *)iort_table;
1079 /* Get the first IORT node */
1080 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
1082 iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort,
1083 iort_table->length);
1085 for (i = 0; i < iort->node_count; i++) {
1086 if (iort_node >= iort_end) {
1087 pr_err("iort node pointer overflows, bad table\n");
1091 if ((iort_node->type == ACPI_IORT_NODE_SMMU) ||
1092 (iort_node->type == ACPI_IORT_NODE_SMMU_V3)) {
1094 fwnode = acpi_alloc_fwnode_static();
1098 iort_set_fwnode(iort_node, fwnode);
1100 ret = iort_add_smmu_platform_device(iort_node);
1102 iort_delete_fwnode(iort_node);
1103 acpi_free_fwnode_static(fwnode);
1108 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
1113 void __init acpi_iort_init(void)
1117 status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
1118 if (ACPI_FAILURE(status)) {
1119 if (status != AE_NOT_FOUND) {
1120 const char *msg = acpi_format_exception(status);
1122 pr_err("Failed to get table, %s\n", msg);
1128 iort_init_platform_devices();