drivers/acpi/arm64/iort.c

   1 /*
   2  * Copyright (C) 2016, Semihalf
   3  *      Author: Tomasz Nowicki <tn@semihalf.com>
   4  *
   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.
   8  *
   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
  12  * more details.
  13  *
  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
  17  */
  18
  19 #define pr_fmt(fmt)     "ACPI: IORT: " fmt
  20
  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>
  28
  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))
  33
  34 struct iort_its_msi_chip {
  35         struct list_head        list;
  36         struct fwnode_handle    *fw_node;
  37         u32                     translation_id;
  38 };
  39
  40 struct iort_fwnode {
  41         struct list_head list;
  42         struct acpi_iort_node *iort_node;
  43         struct fwnode_handle *fwnode;
  44 };
  45 static LIST_HEAD(iort_fwnode_list);
  46 static DEFINE_SPINLOCK(iort_fwnode_lock);
  47
  48 /**
  49  * iort_set_fwnode() - Create iort_fwnode and use it to register
  50  *                     iommu data in the iort_fwnode_list
  51  *
  52  * @node: IORT table node associated with the IOMMU
  53  * @fwnode: fwnode associated with the IORT node
  54  *
  55  * Returns: 0 on success
  56  *          <0 on failure
  57  */
  58 static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
  59                                   struct fwnode_handle *fwnode)
  60 {
  61         struct iort_fwnode *np;
  62
  63         np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC);
  64
  65         if (WARN_ON(!np))
  66                 return -ENOMEM;
  67
  68         INIT_LIST_HEAD(&np->list);
  69         np->iort_node = iort_node;
  70         np->fwnode = fwnode;
  71
  72         spin_lock(&iort_fwnode_lock);
  73         list_add_tail(&np->list, &iort_fwnode_list);
  74         spin_unlock(&iort_fwnode_lock);
  75
  76         return 0;
  77 }
  78
  79 /**
  80  * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
  81  *
  82  * @node: IORT table node to be looked-up
  83  *
  84  * Returns: fwnode_handle pointer on success, NULL on failure
  85  */
  86 static inline
  87 struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node)
  88 {
  89         struct iort_fwnode *curr;
  90         struct fwnode_handle *fwnode = NULL;
  91
  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;
  96                         break;
  97                 }
  98         }
  99         spin_unlock(&iort_fwnode_lock);
 100
 101         return fwnode;
 102 }
 103
 104 /**
 105  * iort_delete_fwnode() - Delete fwnode associated with an IORT node
 106  *
 107  * @node: IORT table node associated with fwnode to delete
 108  */
 109 static inline void iort_delete_fwnode(struct acpi_iort_node *node)
 110 {
 111         struct iort_fwnode *curr, *tmp;
 112
 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);
 117                         kfree(curr);
 118                         break;
 119                 }
 120         }
 121         spin_unlock(&iort_fwnode_lock);
 122 }
 123
 124 typedef acpi_status (*iort_find_node_callback)
 125         (struct acpi_iort_node *node, void *context);
 126
 127 /* Root pointer to the mapped IORT table */
 128 static struct acpi_table_header *iort_table;
 129
 130 static LIST_HEAD(iort_msi_chip_list);
 131 static DEFINE_SPINLOCK(iort_msi_chip_lock);
 132
 133 /**
 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.
 136  * @trans_id: ITS ID.
 137  * @fw_node: Domain token.
 138  *
 139  * Returns: 0 on success, -ENOMEM if no memory when allocating list element
 140  */
 141 int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node)
 142 {
 143         struct iort_its_msi_chip *its_msi_chip;
 144
 145         its_msi_chip = kzalloc(sizeof(*its_msi_chip), GFP_KERNEL);
 146         if (!its_msi_chip)
 147                 return -ENOMEM;
 148
 149         its_msi_chip->fw_node = fw_node;
 150         its_msi_chip->translation_id = trans_id;
 151
 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);
 155
 156         return 0;
 157 }
 158
 159 /**
 160  * iort_deregister_domain_token() - Deregister domain token based on ITS ID
 161  * @trans_id: ITS ID.
 162  *
 163  * Returns: none.
 164  */
 165 void iort_deregister_domain_token(int trans_id)
 166 {
 167         struct iort_its_msi_chip *its_msi_chip, *t;
 168
 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);
 173                         kfree(its_msi_chip);
 174                         break;
 175                 }
 176         }
 177         spin_unlock(&iort_msi_chip_lock);
 178 }
 179
 180 /**
 181  * iort_find_domain_token() - Find domain token based on given ITS ID
 182  * @trans_id: ITS ID.
 183  *
 184  * Returns: domain token when find on the list, NULL otherwise
 185  */
 186 struct fwnode_handle *iort_find_domain_token(int trans_id)
 187 {
 188         struct fwnode_handle *fw_node = NULL;
 189         struct iort_its_msi_chip *its_msi_chip;
 190
 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;
 195                         break;
 196                 }
 197         }
 198         spin_unlock(&iort_msi_chip_lock);
 199
 200         return fw_node;
 201 }
 202
 203 static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
 204                                              iort_find_node_callback callback,
 205                                              void *context)
 206 {
 207         struct acpi_iort_node *iort_node, *iort_end;
 208         struct acpi_table_iort *iort;
 209         int i;
 210
 211         if (!iort_table)
 212                 return NULL;
 213
 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,
 217                                  iort->node_offset);
 218         iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
 219                                 iort_table->length);
 220
 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"))
 224                         return NULL;
 225
 226                 if (iort_node->type == type &&
 227                     ACPI_SUCCESS(callback(iort_node, context)))
 228                                 return iort_node;
 229
 230                 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
 231                                          iort_node->length);
 232         }
 233
 234         return NULL;
 235 }
 236
 237 static acpi_status
 238 iort_match_type_callback(struct acpi_iort_node *node, void *context)
 239 {
 240         return AE_OK;
 241 }
 242
 243 bool iort_node_match(u8 type)
 244 {
 245         struct acpi_iort_node *node;
 246
 247         node = iort_scan_node(type, iort_match_type_callback, NULL);
 248
 249         return node != NULL;
 250 }
 251
 252 static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
 253                                             void *context)
 254 {
 255         struct device *dev = context;
 256         acpi_status status;
 257
 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;
 262
 263                 if (!adev) {
 264                         status = AE_NOT_FOUND;
 265                         goto out;
 266                 }
 267
 268                 status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
 269                 if (ACPI_FAILURE(status)) {
 270                         dev_warn(dev, "Can't get device full path name\n");
 271                         goto out;
 272                 }
 273
 274                 ncomp = (struct acpi_iort_named_component *)node->node_data;
 275                 status = !strcmp(ncomp->device_name, buf.pointer) ?
 276                                                         AE_OK : AE_NOT_FOUND;
 277                 acpi_os_free(buf.pointer);
 278         } else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
 279                 struct acpi_iort_root_complex *pci_rc;
 280                 struct pci_bus *bus;
 281
 282                 bus = to_pci_bus(dev);
 283                 pci_rc = (struct acpi_iort_root_complex *)node->node_data;
 284
 285                 /*
 286                  * It is assumed that PCI segment numbers maps one-to-one
 287                  * with root complexes. Each segment number can represent only
 288                  * one root complex.
 289                  */
 290                 status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
 291                                                         AE_OK : AE_NOT_FOUND;
 292         } else {
 293                 status = AE_NOT_FOUND;
 294         }
 295 out:
 296         return status;
 297 }
 298
 299 static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
 300                        u32 *rid_out)
 301 {
 302         /* Single mapping does not care for input id */
 303         if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
 304                 if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
 305                     type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
 306                         *rid_out = map->output_base;
 307                         return 0;
 308                 }
 309
 310                 pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
 311                         map, type);
 312                 return -ENXIO;
 313         }
 314
 315         if (rid_in < map->input_base ||
 316             (rid_in >= map->input_base + map->id_count))
 317                 return -ENXIO;
 318
 319         *rid_out = map->output_base + (rid_in - map->input_base);
 320         return 0;
 321 }
 322
 323 static
 324 struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 325                                         u32 *id_out, u8 type_mask,
 326                                         int index)
 327 {
 328         struct acpi_iort_node *parent;
 329         struct acpi_iort_id_mapping *map;
 330
 331         if (!node->mapping_offset || !node->mapping_count ||
 332                                      index >= node->mapping_count)
 333                 return NULL;
 334
 335         map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
 336                            node->mapping_offset + index * sizeof(*map));
 337
 338         /* Firmware bug! */
 339         if (!map->output_reference) {
 340                 pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
 341                        node, node->type);
 342                 return NULL;
 343         }
 344
 345         parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
 346                                map->output_reference);
 347
 348         if (!(IORT_TYPE_MASK(parent->type) & type_mask))
 349                 return NULL;
 350
 351         if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
 352                 if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
 353                     node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
 354                         *id_out = map->output_base;
 355                         return parent;
 356                 }
 357         }
 358
 359         return NULL;
 360 }
 361
 362 static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
 363                                                 u32 rid_in, u32 *rid_out,
 364                                                 u8 type_mask)
 365 {
 366         u32 rid = rid_in;
 367
 368         /* Parse the ID mapping tree to find specified node type */
 369         while (node) {
 370                 struct acpi_iort_id_mapping *map;
 371                 int i;
 372
 373                 if (IORT_TYPE_MASK(node->type) & type_mask) {
 374                         if (rid_out)
 375                                 *rid_out = rid;
 376                         return node;
 377                 }
 378
 379                 if (!node->mapping_offset || !node->mapping_count)
 380                         goto fail_map;
 381
 382                 map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
 383                                    node->mapping_offset);
 384
 385                 /* Firmware bug! */
 386                 if (!map->output_reference) {
 387                         pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
 388                                node, node->type);
 389                         goto fail_map;
 390                 }
 391
 392                 /* Do the RID translation */
 393                 for (i = 0; i < node->mapping_count; i++, map++) {
 394                         if (!iort_id_map(map, node->type, rid, &rid))
 395                                 break;
 396                 }
 397
 398                 if (i == node->mapping_count)
 399                         goto fail_map;
 400
 401                 node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
 402                                     map->output_reference);
 403         }
 404
 405 fail_map:
 406         /* Map input RID to output RID unchanged on mapping failure*/
 407         if (rid_out)
 408                 *rid_out = rid_in;
 409
 410         return NULL;
 411 }
 412
 413 static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
 414 {
 415         struct pci_bus *pbus;
 416
 417         if (!dev_is_pci(dev))
 418                 return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
 419                                       iort_match_node_callback, dev);
 420
 421         /* Find a PCI root bus */
 422         pbus = to_pci_dev(dev)->bus;
 423         while (!pci_is_root_bus(pbus))
 424                 pbus = pbus->parent;
 425
 426         return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
 427                               iort_match_node_callback, &pbus->dev);
 428 }
 429
 430 /**
 431  * iort_msi_map_rid() - Map a MSI requester ID for a device
 432  * @dev: The device for which the mapping is to be done.
 433  * @req_id: The device requester ID.
 434  *
 435  * Returns: mapped MSI RID on success, input requester ID otherwise
 436  */
 437 u32 iort_msi_map_rid(struct device *dev, u32 req_id)
 438 {
 439         struct acpi_iort_node *node;
 440         u32 dev_id;
 441
 442         node = iort_find_dev_node(dev);
 443         if (!node)
 444                 return req_id;
 445
 446         iort_node_map_rid(node, req_id, &dev_id, IORT_MSI_TYPE);
 447         return dev_id;
 448 }
 449
 450 /**
 451  * iort_dev_find_its_id() - Find the ITS identifier for a device
 452  * @dev: The device.
 453  * @idx: Index of the ITS identifier list.
 454  * @its_id: ITS identifier.
 455  *
 456  * Returns: 0 on success, appropriate error value otherwise
 457  */
 458 static int iort_dev_find_its_id(struct device *dev, u32 req_id,
 459                                 unsigned int idx, int *its_id)
 460 {
 461         struct acpi_iort_its_group *its;
 462         struct acpi_iort_node *node;
 463
 464         node = iort_find_dev_node(dev);
 465         if (!node)
 466                 return -ENXIO;
 467
 468         node = iort_node_map_rid(node, req_id, NULL, IORT_MSI_TYPE);
 469         if (!node)
 470                 return -ENXIO;
 471
 472         /* Move to ITS specific data */
 473         its = (struct acpi_iort_its_group *)node->node_data;
 474         if (idx > its->its_count) {
 475                 dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n",
 476                         idx, its->its_count);
 477                 return -ENXIO;
 478         }
 479
 480         *its_id = its->identifiers[idx];
 481         return 0;
 482 }
 483
 484 /**
 485  * iort_get_device_domain() - Find MSI domain related to a device
 486  * @dev: The device.
 487  * @req_id: Requester ID for the device.
 488  *
 489  * Returns: the MSI domain for this device, NULL otherwise
 490  */
 491 struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
 492 {
 493         struct fwnode_handle *handle;
 494         int its_id;
 495
 496         if (iort_dev_find_its_id(dev, req_id, 0, &its_id))
 497                 return NULL;
 498
 499         handle = iort_find_domain_token(its_id);
 500         if (!handle)
 501                 return NULL;
 502
 503         return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
 504 }
 505
 506 static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
 507 {
 508         u32 *rid = data;
 509
 510         *rid = alias;
 511         return 0;
 512 }
 513
 514 static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
 515                                struct fwnode_handle *fwnode,
 516                                const struct iommu_ops *ops)
 517 {
 518         int ret = iommu_fwspec_init(dev, fwnode, ops);
 519
 520         if (!ret)
 521                 ret = iommu_fwspec_add_ids(dev, &streamid, 1);
 522
 523         return ret;
 524 }
 525
 526 static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
 527                                         struct acpi_iort_node *node,
 528                                         u32 streamid)
 529 {
 530         const struct iommu_ops *ops = NULL;
 531         int ret = -ENODEV;
 532         struct fwnode_handle *iort_fwnode;
 533
 534         if (node) {
 535                 iort_fwnode = iort_get_fwnode(node);
 536                 if (!iort_fwnode)
 537                         return NULL;
 538
 539                 ops = iommu_ops_from_fwnode(iort_fwnode);
 540                 if (!ops)
 541                         return NULL;
 542
 543                 ret = arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
 544         }
 545
 546         return ret ? NULL : ops;
 547 }
 548
 549 /**
 550  * iort_set_dma_mask - Set-up dma mask for a device.
 551  *
 552  * @dev: device to configure
 553  */
 554 void iort_set_dma_mask(struct device *dev)
 555 {
 556         /*
 557          * Set default coherent_dma_mask to 32 bit.  Drivers are expected to
 558          * setup the correct supported mask.
 559          */
 560         if (!dev->coherent_dma_mask)
 561                 dev->coherent_dma_mask = DMA_BIT_MASK(32);
 562
 563         /*
 564          * Set it to coherent_dma_mask by default if the architecture
 565          * code has not set it.
 566          */
 567         if (!dev->dma_mask)
 568                 dev->dma_mask = &dev->coherent_dma_mask;
 569 }
 570
 571 /**
 572  * iort_iommu_configure - Set-up IOMMU configuration for a device.
 573  *
 574  * @dev: device to configure
 575  *
 576  * Returns: iommu_ops pointer on configuration success
 577  *          NULL on configuration failure
 578  */
 579 const struct iommu_ops *iort_iommu_configure(struct device *dev)
 580 {
 581         struct acpi_iort_node *node, *parent;
 582         const struct iommu_ops *ops = NULL;
 583         u32 streamid = 0;
 584
 585         if (dev_is_pci(dev)) {
 586                 struct pci_bus *bus = to_pci_dev(dev)->bus;
 587                 u32 rid;
 588
 589                 pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid,
 590                                        &rid);
 591
 592                 node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
 593                                       iort_match_node_callback, &bus->dev);
 594                 if (!node)
 595                         return NULL;
 596
 597                 parent = iort_node_map_rid(node, rid, &streamid,
 598                                            IORT_IOMMU_TYPE);
 599
 600                 ops = iort_iommu_xlate(dev, parent, streamid);
 601
 602         } else {
 603                 int i = 0;
 604
 605                 node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
 606                                       iort_match_node_callback, dev);
 607                 if (!node)
 608                         return NULL;
 609
 610                 parent = iort_node_get_id(node, &streamid,
 611                                           IORT_IOMMU_TYPE, i++);
 612
 613                 while (parent) {
 614                         ops = iort_iommu_xlate(dev, parent, streamid);
 615
 616                         parent = iort_node_get_id(node, &streamid,
 617                                                   IORT_IOMMU_TYPE, i++);
 618                 }
 619         }
 620
 621         return ops;
 622 }
 623
 624 static void __init acpi_iort_register_irq(int hwirq, const char *name,
 625                                           int trigger,
 626                                           struct resource *res)
 627 {
 628         int irq = acpi_register_gsi(NULL, hwirq, trigger,
 629                                     ACPI_ACTIVE_HIGH);
 630
 631         if (irq <= 0) {
 632                 pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,
 633                                                                       name);
 634                 return;
 635         }
 636
 637         res->start = irq;
 638         res->end = irq;
 639         res->flags = IORESOURCE_IRQ;
 640         res->name = name;
 641 }
 642
 643 static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)
 644 {
 645         struct acpi_iort_smmu_v3 *smmu;
 646         /* Always present mem resource */
 647         int num_res = 1;
 648
 649         /* Retrieve SMMUv3 specific data */
 650         smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 651
 652         if (smmu->event_gsiv)
 653                 num_res++;
 654
 655         if (smmu->pri_gsiv)
 656                 num_res++;
 657
 658         if (smmu->gerr_gsiv)
 659                 num_res++;
 660
 661         if (smmu->sync_gsiv)
 662                 num_res++;
 663
 664         return num_res;
 665 }
 666
 667 static void __init arm_smmu_v3_init_resources(struct resource *res,
 668                                               struct acpi_iort_node *node)
 669 {
 670         struct acpi_iort_smmu_v3 *smmu;
 671         int num_res = 0;
 672
 673         /* Retrieve SMMUv3 specific data */
 674         smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 675
 676         res[num_res].start = smmu->base_address;
 677         res[num_res].end = smmu->base_address + SZ_128K - 1;
 678         res[num_res].flags = IORESOURCE_MEM;
 679
 680         num_res++;
 681
 682         if (smmu->event_gsiv)
 683                 acpi_iort_register_irq(smmu->event_gsiv, "eventq",
 684                                        ACPI_EDGE_SENSITIVE,
 685                                        &res[num_res++]);
 686
 687         if (smmu->pri_gsiv)
 688                 acpi_iort_register_irq(smmu->pri_gsiv, "priq",
 689                                        ACPI_EDGE_SENSITIVE,
 690                                        &res[num_res++]);
 691
 692         if (smmu->gerr_gsiv)
 693                 acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",
 694                                        ACPI_EDGE_SENSITIVE,
 695                                        &res[num_res++]);
 696
 697         if (smmu->sync_gsiv)
 698                 acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",
 699                                        ACPI_EDGE_SENSITIVE,
 700                                        &res[num_res++]);
 701 }
 702
 703 static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
 704 {
 705         struct acpi_iort_smmu_v3 *smmu;
 706
 707         /* Retrieve SMMUv3 specific data */
 708         smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 709
 710         return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
 711 }
 712
 713 static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
 714 {
 715         struct acpi_iort_smmu *smmu;
 716
 717         /* Retrieve SMMU specific data */
 718         smmu = (struct acpi_iort_smmu *)node->node_data;
 719
 720         /*
 721          * Only consider the global fault interrupt and ignore the
 722          * configuration access interrupt.
 723          *
 724          * MMIO address and global fault interrupt resources are always
 725          * present so add them to the context interrupt count as a static
 726          * value.
 727          */
 728         return smmu->context_interrupt_count + 2;
 729 }
 730
 731 static void __init arm_smmu_init_resources(struct resource *res,
 732                                            struct acpi_iort_node *node)
 733 {
 734         struct acpi_iort_smmu *smmu;
 735         int i, hw_irq, trigger, num_res = 0;
 736         u64 *ctx_irq, *glb_irq;
 737
 738         /* Retrieve SMMU specific data */
 739         smmu = (struct acpi_iort_smmu *)node->node_data;
 740
 741         res[num_res].start = smmu->base_address;
 742         res[num_res].end = smmu->base_address + smmu->span - 1;
 743         res[num_res].flags = IORESOURCE_MEM;
 744         num_res++;
 745
 746         glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
 747         /* Global IRQs */
 748         hw_irq = IORT_IRQ_MASK(glb_irq[0]);
 749         trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);
 750
 751         acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
 752                                      &res[num_res++]);
 753
 754         /* Context IRQs */
 755         ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
 756         for (i = 0; i < smmu->context_interrupt_count; i++) {
 757                 hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
 758                 trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);
 759
 760                 acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
 761                                        &res[num_res++]);
 762         }
 763 }
 764
 765 static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
 766 {
 767         struct acpi_iort_smmu *smmu;
 768
 769         /* Retrieve SMMU specific data */
 770         smmu = (struct acpi_iort_smmu *)node->node_data;
 771
 772         return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
 773 }
 774
 775 struct iort_iommu_config {
 776         const char *name;
 777         int (*iommu_init)(struct acpi_iort_node *node);
 778         bool (*iommu_is_coherent)(struct acpi_iort_node *node);
 779         int (*iommu_count_resources)(struct acpi_iort_node *node);
 780         void (*iommu_init_resources)(struct resource *res,
 781                                      struct acpi_iort_node *node);
 782 };
 783
 784 static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
 785         .name = "arm-smmu-v3",
 786         .iommu_is_coherent = arm_smmu_v3_is_coherent,
 787         .iommu_count_resources = arm_smmu_v3_count_resources,
 788         .iommu_init_resources = arm_smmu_v3_init_resources
 789 };
 790
 791 static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
 792         .name = "arm-smmu",
 793         .iommu_is_coherent = arm_smmu_is_coherent,
 794         .iommu_count_resources = arm_smmu_count_resources,
 795         .iommu_init_resources = arm_smmu_init_resources
 796 };
 797
 798 static __init
 799 const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
 800 {
 801         switch (node->type) {
 802         case ACPI_IORT_NODE_SMMU_V3:
 803                 return &iort_arm_smmu_v3_cfg;
 804         case ACPI_IORT_NODE_SMMU:
 805                 return &iort_arm_smmu_cfg;
 806         default:
 807                 return NULL;
 808         }
 809 }
 810
 811 /**
 812  * iort_add_smmu_platform_device() - Allocate a platform device for SMMU
 813  * @node: Pointer to SMMU ACPI IORT node
 814  *
 815  * Returns: 0 on success, <0 failure
 816  */
 817 static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
 818 {
 819         struct fwnode_handle *fwnode;
 820         struct platform_device *pdev;
 821         struct resource *r;
 822         enum dev_dma_attr attr;
 823         int ret, count;
 824         const struct iort_iommu_config *ops = iort_get_iommu_cfg(node);
 825
 826         if (!ops)
 827                 return -ENODEV;
 828
 829         pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
 830         if (!pdev)
 831                 return -ENOMEM;
 832
 833         count = ops->iommu_count_resources(node);
 834
 835         r = kcalloc(count, sizeof(*r), GFP_KERNEL);
 836         if (!r) {
 837                 ret = -ENOMEM;
 838                 goto dev_put;
 839         }
 840
 841         ops->iommu_init_resources(r, node);
 842
 843         ret = platform_device_add_resources(pdev, r, count);
 844         /*
 845          * Resources are duplicated in platform_device_add_resources,
 846          * free their allocated memory
 847          */
 848         kfree(r);
 849
 850         if (ret)
 851                 goto dev_put;
 852
 853         /*
 854          * Add a copy of IORT node pointer to platform_data to
 855          * be used to retrieve IORT data information.
 856          */
 857         ret = platform_device_add_data(pdev, &node, sizeof(node));
 858         if (ret)
 859                 goto dev_put;
 860
 861         /*
 862          * We expect the dma masks to be equivalent for
 863          * all SMMUs set-ups
 864          */
 865         pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 866
 867         fwnode = iort_get_fwnode(node);
 868
 869         if (!fwnode) {
 870                 ret = -ENODEV;
 871                 goto dev_put;
 872         }
 873
 874         pdev->dev.fwnode = fwnode;
 875
 876         attr = ops->iommu_is_coherent(node) ?
 877                              DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
 878
 879         /* Configure DMA for the page table walker */
 880         acpi_dma_configure(&pdev->dev, attr);
 881
 882         ret = platform_device_add(pdev);
 883         if (ret)
 884                 goto dma_deconfigure;
 885
 886         return 0;
 887
 888 dma_deconfigure:
 889         acpi_dma_deconfigure(&pdev->dev);
 890 dev_put:
 891         platform_device_put(pdev);
 892
 893         return ret;
 894 }
 895
 896 static void __init iort_init_platform_devices(void)
 897 {
 898         struct acpi_iort_node *iort_node, *iort_end;
 899         struct acpi_table_iort *iort;
 900         struct fwnode_handle *fwnode;
 901         int i, ret;
 902
 903         /*
 904          * iort_table and iort both point to the start of IORT table, but
 905          * have different struct types
 906          */
 907         iort = (struct acpi_table_iort *)iort_table;
 908
 909         /* Get the first IORT node */
 910         iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
 911                                  iort->node_offset);
 912         iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort,
 913                                 iort_table->length);
 914
 915         for (i = 0; i < iort->node_count; i++) {
 916                 if (iort_node >= iort_end) {
 917                         pr_err("iort node pointer overflows, bad table\n");
 918                         return;
 919                 }
 920
 921                 if ((iort_node->type == ACPI_IORT_NODE_SMMU) ||
 922                         (iort_node->type == ACPI_IORT_NODE_SMMU_V3)) {
 923
 924                         fwnode = acpi_alloc_fwnode_static();
 925                         if (!fwnode)
 926                                 return;
 927
 928                         iort_set_fwnode(iort_node, fwnode);
 929
 930                         ret = iort_add_smmu_platform_device(iort_node);
 931                         if (ret) {
 932                                 iort_delete_fwnode(iort_node);
 933                                 acpi_free_fwnode_static(fwnode);
 934                                 return;
 935                         }
 936                 }
 937
 938                 iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
 939                                          iort_node->length);
 940         }
 941 }
 942
 943 void __init acpi_iort_init(void)
 944 {
 945         acpi_status status;
 946
 947         status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
 948         if (ACPI_FAILURE(status)) {
 949                 if (status != AE_NOT_FOUND) {
 950                         const char *msg = acpi_format_exception(status);
 951
 952                         pr_err("Failed to get table, %s\n", msg);
 953                 }
 954
 955                 return;
 956         }
 957
 958         iort_init_platform_devices();
 959
 960         acpi_probe_device_table(iort);
 961 }