drivers/pci/dmar.c

   1 /*
   2  * Copyright (c) 2006, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Copyright (C) 2006-2008 Intel Corporation
  18  * Author: Ashok Raj <ashok.raj@intel.com>
  19  * Author: Shaohua Li <shaohua.li@intel.com>
  20  * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
  21  *
  22  * This file implements early detection/parsing of Remapping Devices
  23  * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
  24  * tables.
  25  *
  26  * These routines are used by both DMA-remapping and Interrupt-remapping
  27  */
  28
  29 #include <linux/pci.h>
  30 #include <linux/dmar.h>
  31 #include <linux/iova.h>
  32 #include <linux/intel-iommu.h>
  33 #include <linux/timer.h>
  34
  35 #undef PREFIX
  36 #define PREFIX "DMAR:"
  37
  38 /* No locks are needed as DMA remapping hardware unit
  39  * list is constructed at boot time and hotplug of
  40  * these units are not supported by the architecture.
  41  */
  42 LIST_HEAD(dmar_drhd_units);
  43
  44 static struct acpi_table_header * __initdata dmar_tbl;
  45 static acpi_size dmar_tbl_size;
  46
  47 static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
  48 {
  49         /*
  50          * add INCLUDE_ALL at the tail, so scan the list will find it at
  51          * the very end.
  52          */
  53         if (drhd->include_all)
  54                 list_add_tail(&drhd->list, &dmar_drhd_units);
  55         else
  56                 list_add(&drhd->list, &dmar_drhd_units);
  57 }
  58
  59 static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
  60                                            struct pci_dev **dev, u16 segment)
  61 {
  62         struct pci_bus *bus;
  63         struct pci_dev *pdev = NULL;
  64         struct acpi_dmar_pci_path *path;
  65         int count;
  66
  67         bus = pci_find_bus(segment, scope->bus);
  68         path = (struct acpi_dmar_pci_path *)(scope + 1);
  69         count = (scope->length - sizeof(struct acpi_dmar_device_scope))
  70                 / sizeof(struct acpi_dmar_pci_path);
  71
  72         while (count) {
  73                 if (pdev)
  74                         pci_dev_put(pdev);
  75                 /*
  76                  * Some BIOSes list non-exist devices in DMAR table, just
  77                  * ignore it
  78                  */
  79                 if (!bus) {
  80                         printk(KERN_WARNING
  81                         PREFIX "Device scope bus [%d] not found\n",
  82                         scope->bus);
  83                         break;
  84                 }
  85                 pdev = pci_get_slot(bus, PCI_DEVFN(path->dev, path->fn));
  86                 if (!pdev) {
  87                         printk(KERN_WARNING PREFIX
  88                         "Device scope device [%04x:%02x:%02x.%02x] not found\n",
  89                                 segment, bus->number, path->dev, path->fn);
  90                         break;
  91                 }
  92                 path ++;
  93                 count --;
  94                 bus = pdev->subordinate;
  95         }
  96         if (!pdev) {
  97                 printk(KERN_WARNING PREFIX
  98                 "Device scope device [%04x:%02x:%02x.%02x] not found\n",
  99                 segment, scope->bus, path->dev, path->fn);
 100                 *dev = NULL;
 101                 return 0;
 102         }
 103         if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \
 104                         pdev->subordinate) || (scope->entry_type == \
 105                         ACPI_DMAR_SCOPE_TYPE_BRIDGE && !pdev->subordinate)) {
 106                 pci_dev_put(pdev);
 107                 printk(KERN_WARNING PREFIX
 108                         "Device scope type does not match for %s\n",
 109                          pci_name(pdev));
 110                 return -EINVAL;
 111         }
 112         *dev = pdev;
 113         return 0;
 114 }
 115
 116 static int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
 117                                        struct pci_dev ***devices, u16 segment)
 118 {
 119         struct acpi_dmar_device_scope *scope;
 120         void * tmp = start;
 121         int index;
 122         int ret;
 123
 124         *cnt = 0;
 125         while (start < end) {
 126                 scope = start;
 127                 if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
 128                     scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE)
 129                         (*cnt)++;
 130                 else
 131                         printk(KERN_WARNING PREFIX
 132                                 "Unsupported device scope\n");
 133                 start += scope->length;
 134         }
 135         if (*cnt == 0)
 136                 return 0;
 137
 138         *devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL);
 139         if (!*devices)
 140                 return -ENOMEM;
 141
 142         start = tmp;
 143         index = 0;
 144         while (start < end) {
 145                 scope = start;
 146                 if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
 147                     scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) {
 148                         ret = dmar_parse_one_dev_scope(scope,
 149                                 &(*devices)[index], segment);
 150                         if (ret) {
 151                                 kfree(*devices);
 152                                 return ret;
 153                         }
 154                         index ++;
 155                 }
 156                 start += scope->length;
 157         }
 158
 159         return 0;
 160 }
 161
 162 /**
 163  * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition
 164  * structure which uniquely represent one DMA remapping hardware unit
 165  * present in the platform
 166  */
 167 static int __init
 168 dmar_parse_one_drhd(struct acpi_dmar_header *header)
 169 {
 170         struct acpi_dmar_hardware_unit *drhd;
 171         struct dmar_drhd_unit *dmaru;
 172         int ret = 0;
 173
 174         dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL);
 175         if (!dmaru)
 176                 return -ENOMEM;
 177
 178         dmaru->hdr = header;
 179         drhd = (struct acpi_dmar_hardware_unit *)header;
 180         dmaru->reg_base_addr = drhd->address;
 181         dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */
 182
 183         ret = alloc_iommu(dmaru);
 184         if (ret) {
 185                 kfree(dmaru);
 186                 return ret;
 187         }
 188         dmar_register_drhd_unit(dmaru);
 189         return 0;
 190 }
 191
 192 static int __init dmar_parse_dev(struct dmar_drhd_unit *dmaru)
 193 {
 194         struct acpi_dmar_hardware_unit *drhd;
 195         int ret = 0;
 196
 197         drhd = (struct acpi_dmar_hardware_unit *) dmaru->hdr;
 198
 199         if (dmaru->include_all)
 200                 return 0;
 201
 202         ret = dmar_parse_dev_scope((void *)(drhd + 1),
 203                                 ((void *)drhd) + drhd->header.length,
 204                                 &dmaru->devices_cnt, &dmaru->devices,
 205                                 drhd->segment);
 206         if (ret) {
 207                 list_del(&dmaru->list);
 208                 kfree(dmaru);
 209         }
 210         return ret;
 211 }
 212
 213 #ifdef CONFIG_DMAR
 214 LIST_HEAD(dmar_rmrr_units);
 215
 216 static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr)
 217 {
 218         list_add(&rmrr->list, &dmar_rmrr_units);
 219 }
 220
 221
 222 static int __init
 223 dmar_parse_one_rmrr(struct acpi_dmar_header *header)
 224 {
 225         struct acpi_dmar_reserved_memory *rmrr;
 226         struct dmar_rmrr_unit *rmrru;
 227
 228         rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
 229         if (!rmrru)
 230                 return -ENOMEM;
 231
 232         rmrru->hdr = header;
 233         rmrr = (struct acpi_dmar_reserved_memory *)header;
 234         rmrru->base_address = rmrr->base_address;
 235         rmrru->end_address = rmrr->end_address;
 236
 237         dmar_register_rmrr_unit(rmrru);
 238         return 0;
 239 }
 240
 241 static int __init
 242 rmrr_parse_dev(struct dmar_rmrr_unit *rmrru)
 243 {
 244         struct acpi_dmar_reserved_memory *rmrr;
 245         int ret;
 246
 247         rmrr = (struct acpi_dmar_reserved_memory *) rmrru->hdr;
 248         ret = dmar_parse_dev_scope((void *)(rmrr + 1),
 249                 ((void *)rmrr) + rmrr->header.length,
 250                 &rmrru->devices_cnt, &rmrru->devices, rmrr->segment);
 251
 252         if (ret || (rmrru->devices_cnt == 0)) {
 253                 list_del(&rmrru->list);
 254                 kfree(rmrru);
 255         }
 256         return ret;
 257 }
 258 #endif
 259
 260 static void __init
 261 dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
 262 {
 263         struct acpi_dmar_hardware_unit *drhd;
 264         struct acpi_dmar_reserved_memory *rmrr;
 265
 266         switch (header->type) {
 267         case ACPI_DMAR_TYPE_HARDWARE_UNIT:
 268                 drhd = (struct acpi_dmar_hardware_unit *)header;
 269                 printk (KERN_INFO PREFIX
 270                         "DRHD (flags: 0x%08x)base: 0x%016Lx\n",
 271                         drhd->flags, (unsigned long long)drhd->address);
 272                 break;
 273         case ACPI_DMAR_TYPE_RESERVED_MEMORY:
 274                 rmrr = (struct acpi_dmar_reserved_memory *)header;
 275
 276                 printk (KERN_INFO PREFIX
 277                         "RMRR base: 0x%016Lx end: 0x%016Lx\n",
 278                         (unsigned long long)rmrr->base_address,
 279                         (unsigned long long)rmrr->end_address);
 280                 break;
 281         }
 282 }
 283
 284 /**
 285  * dmar_table_detect - checks to see if the platform supports DMAR devices
 286  */
 287 static int __init dmar_table_detect(void)
 288 {
 289         acpi_status status = AE_OK;
 290
 291         /* if we could find DMAR table, then there are DMAR devices */
 292         status = acpi_get_table_with_size(ACPI_SIG_DMAR, 0,
 293                                 (struct acpi_table_header **)&dmar_tbl,
 294                                 &dmar_tbl_size);
 295
 296         if (ACPI_SUCCESS(status) && !dmar_tbl) {
 297                 printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
 298                 status = AE_NOT_FOUND;
 299         }
 300
 301         return (ACPI_SUCCESS(status) ? 1 : 0);
 302 }
 303
 304 /**
 305  * parse_dmar_table - parses the DMA reporting table
 306  */
 307 static int __init
 308 parse_dmar_table(void)
 309 {
 310         struct acpi_table_dmar *dmar;
 311         struct acpi_dmar_header *entry_header;
 312         int ret = 0;
 313
 314         /*
 315          * Do it again, earlier dmar_tbl mapping could be mapped with
 316          * fixed map.
 317          */
 318         dmar_table_detect();
 319
 320         dmar = (struct acpi_table_dmar *)dmar_tbl;
 321         if (!dmar)
 322                 return -ENODEV;
 323
 324         if (dmar->width < PAGE_SHIFT - 1) {
 325                 printk(KERN_WARNING PREFIX "Invalid DMAR haw\n");
 326                 return -EINVAL;
 327         }
 328
 329         printk (KERN_INFO PREFIX "Host address width %d\n",
 330                 dmar->width + 1);
 331
 332         entry_header = (struct acpi_dmar_header *)(dmar + 1);
 333         while (((unsigned long)entry_header) <
 334                         (((unsigned long)dmar) + dmar_tbl->length)) {
 335                 dmar_table_print_dmar_entry(entry_header);
 336
 337                 switch (entry_header->type) {
 338                 case ACPI_DMAR_TYPE_HARDWARE_UNIT:
 339                         ret = dmar_parse_one_drhd(entry_header);
 340                         break;
 341                 case ACPI_DMAR_TYPE_RESERVED_MEMORY:
 342 #ifdef CONFIG_DMAR
 343                         ret = dmar_parse_one_rmrr(entry_header);
 344 #endif
 345                         break;
 346                 default:
 347                         printk(KERN_WARNING PREFIX
 348                                 "Unknown DMAR structure type\n");
 349                         ret = 0; /* for forward compatibility */
 350                         break;
 351                 }
 352                 if (ret)
 353                         break;
 354
 355                 entry_header = ((void *)entry_header + entry_header->length);
 356         }
 357         return ret;
 358 }
 359
 360 int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
 361                           struct pci_dev *dev)
 362 {
 363         int index;
 364
 365         while (dev) {
 366                 for (index = 0; index < cnt; index++)
 367                         if (dev == devices[index])
 368                                 return 1;
 369
 370                 /* Check our parent */
 371                 dev = dev->bus->self;
 372         }
 373
 374         return 0;
 375 }
 376
 377 struct dmar_drhd_unit *
 378 dmar_find_matched_drhd_unit(struct pci_dev *dev)
 379 {
 380         struct dmar_drhd_unit *dmaru = NULL;
 381         struct acpi_dmar_hardware_unit *drhd;
 382
 383         list_for_each_entry(dmaru, &dmar_drhd_units, list) {
 384                 drhd = container_of(dmaru->hdr,
 385                                     struct acpi_dmar_hardware_unit,
 386                                     header);
 387
 388                 if (dmaru->include_all &&
 389                     drhd->segment == pci_domain_nr(dev->bus))
 390                         return dmaru;
 391
 392                 if (dmar_pci_device_match(dmaru->devices,
 393                                           dmaru->devices_cnt, dev))
 394                         return dmaru;
 395         }
 396
 397         return NULL;
 398 }
 399
 400 int __init dmar_dev_scope_init(void)
 401 {
 402         struct dmar_drhd_unit *drhd, *drhd_n;
 403         int ret = -ENODEV;
 404
 405         list_for_each_entry_safe(drhd, drhd_n, &dmar_drhd_units, list) {
 406                 ret = dmar_parse_dev(drhd);
 407                 if (ret)
 408                         return ret;
 409         }
 410
 411 #ifdef CONFIG_DMAR
 412         {
 413                 struct dmar_rmrr_unit *rmrr, *rmrr_n;
 414                 list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) {
 415                         ret = rmrr_parse_dev(rmrr);
 416                         if (ret)
 417                                 return ret;
 418                 }
 419         }
 420 #endif
 421
 422         return ret;
 423 }
 424
 425
 426 int __init dmar_table_init(void)
 427 {
 428         static int dmar_table_initialized;
 429         int ret;
 430
 431         if (dmar_table_initialized)
 432                 return 0;
 433
 434         dmar_table_initialized = 1;
 435
 436         ret = parse_dmar_table();
 437         if (ret) {
 438                 if (ret != -ENODEV)
 439                         printk(KERN_INFO PREFIX "parse DMAR table failure.\n");
 440                 return ret;
 441         }
 442
 443         if (list_empty(&dmar_drhd_units)) {
 444                 printk(KERN_INFO PREFIX "No DMAR devices found\n");
 445                 return -ENODEV;
 446         }
 447
 448 #ifdef CONFIG_DMAR
 449         if (list_empty(&dmar_rmrr_units))
 450                 printk(KERN_INFO PREFIX "No RMRR found\n");
 451 #endif
 452
 453 #ifdef CONFIG_INTR_REMAP
 454         parse_ioapics_under_ir();
 455 #endif
 456         return 0;
 457 }
 458
 459 void __init detect_intel_iommu(void)
 460 {
 461         int ret;
 462
 463         ret = dmar_table_detect();
 464
 465         {
 466 #ifdef CONFIG_INTR_REMAP
 467                 struct acpi_table_dmar *dmar;
 468                 /*
 469                  * for now we will disable dma-remapping when interrupt
 470                  * remapping is enabled.
 471                  * When support for queued invalidation for IOTLB invalidation
 472                  * is added, we will not need this any more.
 473                  */
 474                 dmar = (struct acpi_table_dmar *) dmar_tbl;
 475                 if (ret && cpu_has_x2apic && dmar->flags & 0x1)
 476                         printk(KERN_INFO
 477                                "Queued invalidation will be enabled to support "
 478                                "x2apic and Intr-remapping.\n");
 479 #endif
 480 #ifdef CONFIG_DMAR
 481                 if (ret && !no_iommu && !iommu_detected && !swiotlb &&
 482                     !dmar_disabled)
 483                         iommu_detected = 1;
 484 #endif
 485         }
 486         early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size);
 487         dmar_tbl = NULL;
 488 }
 489
 490
 491 int alloc_iommu(struct dmar_drhd_unit *drhd)
 492 {
 493         struct intel_iommu *iommu;
 494         int map_size;
 495         u32 ver;
 496         static int iommu_allocated = 0;
 497         int agaw;
 498
 499         iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
 500         if (!iommu)
 501                 return -ENOMEM;
 502
 503         iommu->seq_id = iommu_allocated++;
 504
 505         iommu->reg = ioremap(drhd->reg_base_addr, VTD_PAGE_SIZE);
 506         if (!iommu->reg) {
 507                 printk(KERN_ERR "IOMMU: can't map the region\n");
 508                 goto error;
 509         }
 510         iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
 511         iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
 512
 513         agaw = iommu_calculate_agaw(iommu);
 514         if (agaw < 0) {
 515                 printk(KERN_ERR
 516                         "Cannot get a valid agaw for iommu (seq_id = %d)\n",
 517                         iommu->seq_id);
 518                 goto error;
 519         }
 520         iommu->agaw = agaw;
 521
 522         /* the registers might be more than one page */
 523         map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
 524                 cap_max_fault_reg_offset(iommu->cap));
 525         map_size = VTD_PAGE_ALIGN(map_size);
 526         if (map_size > VTD_PAGE_SIZE) {
 527                 iounmap(iommu->reg);
 528                 iommu->reg = ioremap(drhd->reg_base_addr, map_size);
 529                 if (!iommu->reg) {
 530                         printk(KERN_ERR "IOMMU: can't map the region\n");
 531                         goto error;
 532                 }
 533         }
 534
 535         ver = readl(iommu->reg + DMAR_VER_REG);
 536         pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n",
 537                 (unsigned long long)drhd->reg_base_addr,
 538                 DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
 539                 (unsigned long long)iommu->cap,
 540                 (unsigned long long)iommu->ecap);
 541
 542         spin_lock_init(&iommu->register_lock);
 543
 544         drhd->iommu = iommu;
 545         return 0;
 546 error:
 547         kfree(iommu);
 548         return -1;
 549 }
 550
 551 void free_iommu(struct intel_iommu *iommu)
 552 {
 553         if (!iommu)
 554                 return;
 555
 556 #ifdef CONFIG_DMAR
 557         free_dmar_iommu(iommu);
 558 #endif
 559
 560         if (iommu->reg)
 561                 iounmap(iommu->reg);
 562         kfree(iommu);
 563 }
 564
 565 /*
 566  * Reclaim all the submitted descriptors which have completed its work.
 567  */
 568 static inline void reclaim_free_desc(struct q_inval *qi)
 569 {
 570         while (qi->desc_status[qi->free_tail] == QI_DONE) {
 571                 qi->desc_status[qi->free_tail] = QI_FREE;
 572                 qi->free_tail = (qi->free_tail + 1) % QI_LENGTH;
 573                 qi->free_cnt++;
 574         }
 575 }
 576
 577 /*
 578  * Submit the queued invalidation descriptor to the remapping
 579  * hardware unit and wait for its completion.
 580  */
 581 void qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu)
 582 {
 583         struct q_inval *qi = iommu->qi;
 584         struct qi_desc *hw, wait_desc;
 585         int wait_index, index;
 586         unsigned long flags;
 587
 588         if (!qi)
 589                 return;
 590
 591         hw = qi->desc;
 592
 593         spin_lock_irqsave(&qi->q_lock, flags);
 594         while (qi->free_cnt < 3) {
 595                 spin_unlock_irqrestore(&qi->q_lock, flags);
 596                 cpu_relax();
 597                 spin_lock_irqsave(&qi->q_lock, flags);
 598         }
 599
 600         index = qi->free_head;
 601         wait_index = (index + 1) % QI_LENGTH;
 602
 603         qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE;
 604
 605         hw[index] = *desc;
 606
 607         wait_desc.low = QI_IWD_STATUS_DATA(2) | QI_IWD_STATUS_WRITE | QI_IWD_TYPE;
 608         wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]);
 609
 610         hw[wait_index] = wait_desc;
 611
 612         __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc));
 613         __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc));
 614
 615         qi->free_head = (qi->free_head + 2) % QI_LENGTH;
 616         qi->free_cnt -= 2;
 617
 618         spin_lock(&iommu->register_lock);
 619         /*
 620          * update the HW tail register indicating the presence of
 621          * new descriptors.
 622          */
 623         writel(qi->free_head << 4, iommu->reg + DMAR_IQT_REG);
 624         spin_unlock(&iommu->register_lock);
 625
 626         while (qi->desc_status[wait_index] != QI_DONE) {
 627                 /*
 628                  * We will leave the interrupts disabled, to prevent interrupt
 629                  * context to queue another cmd while a cmd is already submitted
 630                  * and waiting for completion on this cpu. This is to avoid
 631                  * a deadlock where the interrupt context can wait indefinitely
 632                  * for free slots in the queue.
 633                  */
 634                 spin_unlock(&qi->q_lock);
 635                 cpu_relax();
 636                 spin_lock(&qi->q_lock);
 637         }
 638
 639         qi->desc_status[index] = QI_DONE;
 640
 641         reclaim_free_desc(qi);
 642         spin_unlock_irqrestore(&qi->q_lock, flags);
 643 }
 644
 645 /*
 646  * Flush the global interrupt entry cache.
 647  */
 648 void qi_global_iec(struct intel_iommu *iommu)
 649 {
 650         struct qi_desc desc;
 651
 652         desc.low = QI_IEC_TYPE;
 653         desc.high = 0;
 654
 655         qi_submit_sync(&desc, iommu);
 656 }
 657
 658 int qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm,
 659                      u64 type, int non_present_entry_flush)
 660 {
 661
 662         struct qi_desc desc;
 663
 664         if (non_present_entry_flush) {
 665                 if (!cap_caching_mode(iommu->cap))
 666                         return 1;
 667                 else
 668                         did = 0;
 669         }
 670
 671         desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did)
 672                         | QI_CC_GRAN(type) | QI_CC_TYPE;
 673         desc.high = 0;
 674
 675         qi_submit_sync(&desc, iommu);
 676
 677         return 0;
 678
 679 }
 680
 681 int qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
 682                    unsigned int size_order, u64 type,
 683                    int non_present_entry_flush)
 684 {
 685         u8 dw = 0, dr = 0;
 686
 687         struct qi_desc desc;
 688         int ih = 0;
 689
 690         if (non_present_entry_flush) {
 691                 if (!cap_caching_mode(iommu->cap))
 692                         return 1;
 693                 else
 694                         did = 0;
 695         }
 696
 697         if (cap_write_drain(iommu->cap))
 698                 dw = 1;
 699
 700         if (cap_read_drain(iommu->cap))
 701                 dr = 1;
 702
 703         desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) | QI_IOTLB_DW(dw)
 704                 | QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE;
 705         desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih)
 706                 | QI_IOTLB_AM(size_order);
 707
 708         qi_submit_sync(&desc, iommu);
 709
 710         return 0;
 711
 712 }
 713
 714 /*
 715  * Enable Queued Invalidation interface. This is a must to support
 716  * interrupt-remapping. Also used by DMA-remapping, which replaces
 717  * register based IOTLB invalidation.
 718  */
 719 int dmar_enable_qi(struct intel_iommu *iommu)
 720 {
 721         u32 cmd, sts;
 722         unsigned long flags;
 723         struct q_inval *qi;
 724
 725         if (!ecap_qis(iommu->ecap))
 726                 return -ENOENT;
 727
 728         /*
 729          * queued invalidation is already setup and enabled.
 730          */
 731         if (iommu->qi)
 732                 return 0;
 733
 734         iommu->qi = kmalloc(sizeof(*qi), GFP_KERNEL);
 735         if (!iommu->qi)
 736                 return -ENOMEM;
 737
 738         qi = iommu->qi;
 739
 740         qi->desc = (void *)(get_zeroed_page(GFP_KERNEL));
 741         if (!qi->desc) {
 742                 kfree(qi);
 743                 iommu->qi = 0;
 744                 return -ENOMEM;
 745         }
 746
 747         qi->desc_status = kmalloc(QI_LENGTH * sizeof(int), GFP_KERNEL);
 748         if (!qi->desc_status) {
 749                 free_page((unsigned long) qi->desc);
 750                 kfree(qi);
 751                 iommu->qi = 0;
 752                 return -ENOMEM;
 753         }
 754
 755         qi->free_head = qi->free_tail = 0;
 756         qi->free_cnt = QI_LENGTH;
 757
 758         spin_lock_init(&qi->q_lock);
 759
 760         spin_lock_irqsave(&iommu->register_lock, flags);
 761         /* write zero to the tail reg */
 762         writel(0, iommu->reg + DMAR_IQT_REG);
 763
 764         dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc));
 765
 766         cmd = iommu->gcmd | DMA_GCMD_QIE;
 767         iommu->gcmd |= DMA_GCMD_QIE;
 768         writel(cmd, iommu->reg + DMAR_GCMD_REG);
 769
 770         /* Make sure hardware complete it */
 771         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts);
 772         spin_unlock_irqrestore(&iommu->register_lock, flags);
 773
 774         return 0;
 775 }