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,
237 static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
240 struct device *dev = context;
241 acpi_status status = AE_NOT_FOUND;
243 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
244 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
245 struct acpi_device *adev = to_acpi_device_node(dev->fwnode);
246 struct acpi_iort_named_component *ncomp;
251 status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
252 if (ACPI_FAILURE(status)) {
253 dev_warn(dev, "Can't get device full path name\n");
257 ncomp = (struct acpi_iort_named_component *)node->node_data;
258 status = !strcmp(ncomp->device_name, buf.pointer) ?
259 AE_OK : AE_NOT_FOUND;
260 acpi_os_free(buf.pointer);
261 } else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
262 struct acpi_iort_root_complex *pci_rc;
265 bus = to_pci_bus(dev);
266 pci_rc = (struct acpi_iort_root_complex *)node->node_data;
269 * It is assumed that PCI segment numbers maps one-to-one
270 * with root complexes. Each segment number can represent only
273 status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
274 AE_OK : AE_NOT_FOUND;
280 static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
283 /* Single mapping does not care for input id */
284 if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
285 if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
286 type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
287 *rid_out = map->output_base;
291 pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
296 if (rid_in < map->input_base ||
297 (rid_in >= map->input_base + map->id_count))
300 *rid_out = map->output_base + (rid_in - map->input_base);
305 struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
306 u32 *id_out, int index)
308 struct acpi_iort_node *parent;
309 struct acpi_iort_id_mapping *map;
311 if (!node->mapping_offset || !node->mapping_count ||
312 index >= node->mapping_count)
315 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
316 node->mapping_offset + index * sizeof(*map));
319 if (!map->output_reference) {
320 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
325 parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
326 map->output_reference);
328 if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
329 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
330 node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
331 *id_out = map->output_base;
339 static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
340 u32 id_in, u32 *id_out,
345 /* Parse the ID mapping tree to find specified node type */
347 struct acpi_iort_id_mapping *map;
350 if (IORT_TYPE_MASK(node->type) & type_mask) {
356 if (!node->mapping_offset || !node->mapping_count)
359 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
360 node->mapping_offset);
363 if (!map->output_reference) {
364 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
369 /* Do the ID translation */
370 for (i = 0; i < node->mapping_count; i++, map++) {
371 if (!iort_id_map(map, node->type, id, &id))
375 if (i == node->mapping_count)
378 node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
379 map->output_reference);
383 /* Map input ID to output ID unchanged on mapping failure */
391 struct acpi_iort_node *iort_node_map_platform_id(struct acpi_iort_node *node,
392 u32 *id_out, u8 type_mask,
395 struct acpi_iort_node *parent;
398 /* step 1: retrieve the initial dev id */
399 parent = iort_node_get_id(node, &id, index);
404 * optional step 2: map the initial dev id if its parent is not
405 * the target type we want, map it again for the use cases such
406 * as NC (named component) -> SMMU -> ITS. If the type is matched,
407 * return the initial dev id and its parent pointer directly.
409 if (!(IORT_TYPE_MASK(parent->type) & type_mask))
410 parent = iort_node_map_id(parent, id, id_out, type_mask);
418 static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
420 struct pci_bus *pbus;
422 if (!dev_is_pci(dev))
423 return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
424 iort_match_node_callback, dev);
426 /* Find a PCI root bus */
427 pbus = to_pci_dev(dev)->bus;
428 while (!pci_is_root_bus(pbus))
431 return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
432 iort_match_node_callback, &pbus->dev);
436 * iort_msi_map_rid() - Map a MSI requester ID for a device
437 * @dev: The device for which the mapping is to be done.
438 * @req_id: The device requester ID.
440 * Returns: mapped MSI RID on success, input requester ID otherwise
442 u32 iort_msi_map_rid(struct device *dev, u32 req_id)
444 struct acpi_iort_node *node;
447 node = iort_find_dev_node(dev);
451 iort_node_map_id(node, req_id, &dev_id, IORT_MSI_TYPE);
456 * iort_pmsi_get_dev_id() - Get the device id for a device
457 * @dev: The device for which the mapping is to be done.
458 * @dev_id: The device ID found.
460 * Returns: 0 for successful find a dev id, -ENODEV on error
462 int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
465 struct acpi_iort_node *node;
467 node = iort_find_dev_node(dev);
471 for (i = 0; i < node->mapping_count; i++) {
472 if (iort_node_map_platform_id(node, dev_id, IORT_MSI_TYPE, i))
480 * iort_dev_find_its_id() - Find the ITS identifier for a device
482 * @req_id: Device's requester ID
483 * @idx: Index of the ITS identifier list.
484 * @its_id: ITS identifier.
486 * Returns: 0 on success, appropriate error value otherwise
488 static int iort_dev_find_its_id(struct device *dev, u32 req_id,
489 unsigned int idx, int *its_id)
491 struct acpi_iort_its_group *its;
492 struct acpi_iort_node *node;
494 node = iort_find_dev_node(dev);
498 node = iort_node_map_id(node, req_id, NULL, IORT_MSI_TYPE);
502 /* Move to ITS specific data */
503 its = (struct acpi_iort_its_group *)node->node_data;
504 if (idx > its->its_count) {
505 dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n",
506 idx, its->its_count);
510 *its_id = its->identifiers[idx];
515 * iort_get_device_domain() - Find MSI domain related to a device
517 * @req_id: Requester ID for the device.
519 * Returns: the MSI domain for this device, NULL otherwise
521 struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
523 struct fwnode_handle *handle;
526 if (iort_dev_find_its_id(dev, req_id, 0, &its_id))
529 handle = iort_find_domain_token(its_id);
533 return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
537 * iort_get_platform_device_domain() - Find MSI domain related to a
539 * @dev: the dev pointer associated with the platform device
541 * Returns: the MSI domain for this device, NULL otherwise
543 static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
545 struct acpi_iort_node *node, *msi_parent;
546 struct fwnode_handle *iort_fwnode;
547 struct acpi_iort_its_group *its;
550 /* find its associated iort node */
551 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
552 iort_match_node_callback, dev);
556 /* then find its msi parent node */
557 for (i = 0; i < node->mapping_count; i++) {
558 msi_parent = iort_node_map_platform_id(node, NULL,
567 /* Move to ITS specific data */
568 its = (struct acpi_iort_its_group *)msi_parent->node_data;
570 iort_fwnode = iort_find_domain_token(its->identifiers[0]);
574 return irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
577 void acpi_configure_pmsi_domain(struct device *dev)
579 struct irq_domain *msi_domain;
581 msi_domain = iort_get_platform_device_domain(dev);
583 dev_set_msi_domain(dev, msi_domain);
586 static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
594 static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
595 struct fwnode_handle *fwnode,
596 const struct iommu_ops *ops)
598 int ret = iommu_fwspec_init(dev, fwnode, ops);
601 ret = iommu_fwspec_add_ids(dev, &streamid, 1);
606 static inline bool iort_iommu_driver_enabled(u8 type)
609 case ACPI_IORT_NODE_SMMU_V3:
610 return IS_BUILTIN(CONFIG_ARM_SMMU_V3);
611 case ACPI_IORT_NODE_SMMU:
612 return IS_BUILTIN(CONFIG_ARM_SMMU);
614 pr_warn("IORT node type %u does not describe an SMMU\n", type);
619 #ifdef CONFIG_IOMMU_API
621 const struct iommu_ops *iort_fwspec_iommu_ops(struct iommu_fwspec *fwspec)
623 return (fwspec && fwspec->ops) ? fwspec->ops : NULL;
627 int iort_add_device_replay(const struct iommu_ops *ops, struct device *dev)
631 if (!IS_ERR_OR_NULL(ops) && ops->add_device && dev->bus &&
633 err = ops->add_device(dev);
639 const struct iommu_ops *iort_fwspec_iommu_ops(struct iommu_fwspec *fwspec)
642 int iort_add_device_replay(const struct iommu_ops *ops, struct device *dev)
646 static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
647 struct acpi_iort_node *node,
650 const struct iommu_ops *ops = NULL;
652 struct fwnode_handle *iort_fwnode;
655 iort_fwnode = iort_get_fwnode(node);
659 ops = iommu_ops_from_fwnode(iort_fwnode);
661 * If the ops look-up fails, this means that either
662 * the SMMU drivers have not been probed yet or that
663 * the SMMU drivers are not built in the kernel;
664 * Depending on whether the SMMU drivers are built-in
665 * in the kernel or not, defer the IOMMU configuration
669 return iort_iommu_driver_enabled(node->type) ?
670 ERR_PTR(-EPROBE_DEFER) : NULL;
672 ret = arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
675 return ret ? NULL : ops;
679 * iort_set_dma_mask - Set-up dma mask for a device.
681 * @dev: device to configure
683 void iort_set_dma_mask(struct device *dev)
686 * Set default coherent_dma_mask to 32 bit. Drivers are expected to
687 * setup the correct supported mask.
689 if (!dev->coherent_dma_mask)
690 dev->coherent_dma_mask = DMA_BIT_MASK(32);
693 * Set it to coherent_dma_mask by default if the architecture
694 * code has not set it.
697 dev->dma_mask = &dev->coherent_dma_mask;
701 * iort_iommu_configure - Set-up IOMMU configuration for a device.
703 * @dev: device to configure
705 * Returns: iommu_ops pointer on configuration success
706 * NULL on configuration failure
708 const struct iommu_ops *iort_iommu_configure(struct device *dev)
710 struct acpi_iort_node *node, *parent;
711 const struct iommu_ops *ops = NULL;
716 * If we already translated the fwspec there
717 * is nothing left to do, return the iommu_ops.
719 ops = iort_fwspec_iommu_ops(dev->iommu_fwspec);
723 if (dev_is_pci(dev)) {
724 struct pci_bus *bus = to_pci_dev(dev)->bus;
727 pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid,
730 node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
731 iort_match_node_callback, &bus->dev);
735 parent = iort_node_map_id(node, rid, &streamid,
738 ops = iort_iommu_xlate(dev, parent, streamid);
743 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
744 iort_match_node_callback, dev);
748 parent = iort_node_map_platform_id(node, &streamid,
749 IORT_IOMMU_TYPE, i++);
752 ops = iort_iommu_xlate(dev, parent, streamid);
753 if (IS_ERR_OR_NULL(ops))
756 parent = iort_node_map_platform_id(node, &streamid,
763 * If we have reason to believe the IOMMU driver missed the initial
764 * add_device callback for dev, replay it to get things in order.
766 err = iort_add_device_replay(ops, dev);
770 /* Ignore all other errors apart from EPROBE_DEFER */
771 if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) {
772 dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops));
779 static void __init acpi_iort_register_irq(int hwirq, const char *name,
781 struct resource *res)
783 int irq = acpi_register_gsi(NULL, hwirq, trigger,
787 pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,
794 res->flags = IORESOURCE_IRQ;
798 static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)
800 struct acpi_iort_smmu_v3 *smmu;
801 /* Always present mem resource */
804 /* Retrieve SMMUv3 specific data */
805 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
807 if (smmu->event_gsiv)
822 static void __init arm_smmu_v3_init_resources(struct resource *res,
823 struct acpi_iort_node *node)
825 struct acpi_iort_smmu_v3 *smmu;
828 /* Retrieve SMMUv3 specific data */
829 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
831 res[num_res].start = smmu->base_address;
832 res[num_res].end = smmu->base_address + SZ_128K - 1;
833 res[num_res].flags = IORESOURCE_MEM;
837 if (smmu->event_gsiv)
838 acpi_iort_register_irq(smmu->event_gsiv, "eventq",
843 acpi_iort_register_irq(smmu->pri_gsiv, "priq",
848 acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",
853 acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",
858 static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
860 struct acpi_iort_smmu_v3 *smmu;
862 /* Retrieve SMMUv3 specific data */
863 smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
865 return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
868 static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
870 struct acpi_iort_smmu *smmu;
872 /* Retrieve SMMU specific data */
873 smmu = (struct acpi_iort_smmu *)node->node_data;
876 * Only consider the global fault interrupt and ignore the
877 * configuration access interrupt.
879 * MMIO address and global fault interrupt resources are always
880 * present so add them to the context interrupt count as a static
883 return smmu->context_interrupt_count + 2;
886 static void __init arm_smmu_init_resources(struct resource *res,
887 struct acpi_iort_node *node)
889 struct acpi_iort_smmu *smmu;
890 int i, hw_irq, trigger, num_res = 0;
891 u64 *ctx_irq, *glb_irq;
893 /* Retrieve SMMU specific data */
894 smmu = (struct acpi_iort_smmu *)node->node_data;
896 res[num_res].start = smmu->base_address;
897 res[num_res].end = smmu->base_address + smmu->span - 1;
898 res[num_res].flags = IORESOURCE_MEM;
901 glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
903 hw_irq = IORT_IRQ_MASK(glb_irq[0]);
904 trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);
906 acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
910 ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
911 for (i = 0; i < smmu->context_interrupt_count; i++) {
912 hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
913 trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);
915 acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
920 static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
922 struct acpi_iort_smmu *smmu;
924 /* Retrieve SMMU specific data */
925 smmu = (struct acpi_iort_smmu *)node->node_data;
927 return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
930 struct iort_iommu_config {
932 int (*iommu_init)(struct acpi_iort_node *node);
933 bool (*iommu_is_coherent)(struct acpi_iort_node *node);
934 int (*iommu_count_resources)(struct acpi_iort_node *node);
935 void (*iommu_init_resources)(struct resource *res,
936 struct acpi_iort_node *node);
939 static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
940 .name = "arm-smmu-v3",
941 .iommu_is_coherent = arm_smmu_v3_is_coherent,
942 .iommu_count_resources = arm_smmu_v3_count_resources,
943 .iommu_init_resources = arm_smmu_v3_init_resources
946 static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
948 .iommu_is_coherent = arm_smmu_is_coherent,
949 .iommu_count_resources = arm_smmu_count_resources,
950 .iommu_init_resources = arm_smmu_init_resources
954 const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
956 switch (node->type) {
957 case ACPI_IORT_NODE_SMMU_V3:
958 return &iort_arm_smmu_v3_cfg;
959 case ACPI_IORT_NODE_SMMU:
960 return &iort_arm_smmu_cfg;
967 * iort_add_smmu_platform_device() - Allocate a platform device for SMMU
968 * @node: Pointer to SMMU ACPI IORT node
970 * Returns: 0 on success, <0 failure
972 static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
974 struct fwnode_handle *fwnode;
975 struct platform_device *pdev;
977 enum dev_dma_attr attr;
979 const struct iort_iommu_config *ops = iort_get_iommu_cfg(node);
984 pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
988 count = ops->iommu_count_resources(node);
990 r = kcalloc(count, sizeof(*r), GFP_KERNEL);
996 ops->iommu_init_resources(r, node);
998 ret = platform_device_add_resources(pdev, r, count);
1000 * Resources are duplicated in platform_device_add_resources,
1001 * free their allocated memory
1009 * Add a copy of IORT node pointer to platform_data to
1010 * be used to retrieve IORT data information.
1012 ret = platform_device_add_data(pdev, &node, sizeof(node));
1017 * We expect the dma masks to be equivalent for
1020 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
1022 fwnode = iort_get_fwnode(node);
1029 pdev->dev.fwnode = fwnode;
1031 attr = ops->iommu_is_coherent(node) ?
1032 DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
1034 /* Configure DMA for the page table walker */
1035 acpi_dma_configure(&pdev->dev, attr);
1037 ret = platform_device_add(pdev);
1039 goto dma_deconfigure;
1044 acpi_dma_deconfigure(&pdev->dev);
1046 platform_device_put(pdev);
1051 static void __init iort_init_platform_devices(void)
1053 struct acpi_iort_node *iort_node, *iort_end;
1054 struct acpi_table_iort *iort;
1055 struct fwnode_handle *fwnode;
1059 * iort_table and iort both point to the start of IORT table, but
1060 * have different struct types
1062 iort = (struct acpi_table_iort *)iort_table;
1064 /* Get the first IORT node */
1065 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
1067 iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort,
1068 iort_table->length);
1070 for (i = 0; i < iort->node_count; i++) {
1071 if (iort_node >= iort_end) {
1072 pr_err("iort node pointer overflows, bad table\n");
1076 if ((iort_node->type == ACPI_IORT_NODE_SMMU) ||
1077 (iort_node->type == ACPI_IORT_NODE_SMMU_V3)) {
1079 fwnode = acpi_alloc_fwnode_static();
1083 iort_set_fwnode(iort_node, fwnode);
1085 ret = iort_add_smmu_platform_device(iort_node);
1087 iort_delete_fwnode(iort_node);
1088 acpi_free_fwnode_static(fwnode);
1093 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
1098 void __init acpi_iort_init(void)
1102 status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
1103 if (ACPI_FAILURE(status)) {
1104 if (status != AE_NOT_FOUND) {
1105 const char *msg = acpi_format_exception(status);
1107 pr_err("Failed to get table, %s\n", msg);
1113 iort_init_platform_devices();