1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. 4 * Author: Joerg Roedel <jroedel@suse.de> 5 * Leo Duran <leo.duran@amd.com> 6 */ 7 8 #define pr_fmt(fmt) "AMD-Vi: " fmt 9 #define dev_fmt(fmt) pr_fmt(fmt) 10 11 #include <linux/ratelimit.h> 12 #include <linux/pci.h> 13 #include <linux/acpi.h> 14 #include <linux/amba/bus.h> 15 #include <linux/platform_device.h> 16 #include <linux/pci-ats.h> 17 #include <linux/bitmap.h> 18 #include <linux/slab.h> 19 #include <linux/debugfs.h> 20 #include <linux/scatterlist.h> 21 #include <linux/dma-map-ops.h> 22 #include <linux/dma-direct.h> 23 #include <linux/dma-iommu.h> 24 #include <linux/iommu-helper.h> 25 #include <linux/delay.h> 26 #include <linux/amd-iommu.h> 27 #include <linux/notifier.h> 28 #include <linux/export.h> 29 #include <linux/irq.h> 30 #include <linux/msi.h> 31 #include <linux/irqdomain.h> 32 #include <linux/percpu.h> 33 #include <linux/iova.h> 34 #include <asm/irq_remapping.h> 35 #include <asm/io_apic.h> 36 #include <asm/apic.h> 37 #include <asm/hw_irq.h> 38 #include <asm/proto.h> 39 #include <asm/iommu.h> 40 #include <asm/gart.h> 41 #include <asm/dma.h> 42 43 #include "amd_iommu.h" 44 #include "../irq_remapping.h" 45 46 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) 47 48 #define LOOP_TIMEOUT 100000 49 50 /* IO virtual address start page frame number */ 51 #define IOVA_START_PFN (1) 52 #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT) 53 54 /* Reserved IOVA ranges */ 55 #define MSI_RANGE_START (0xfee00000) 56 #define MSI_RANGE_END (0xfeefffff) 57 #define HT_RANGE_START (0xfd00000000ULL) 58 #define HT_RANGE_END (0xffffffffffULL) 59 60 /* 61 * This bitmap is used to advertise the page sizes our hardware support 62 * to the IOMMU core, which will then use this information to split 63 * physically contiguous memory regions it is mapping into page sizes 64 * that we support. 65 * 66 * 512GB Pages are not supported due to a hardware bug 67 */ 68 #define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38)) 69 70 #define DEFAULT_PGTABLE_LEVEL PAGE_MODE_3_LEVEL 71 72 static DEFINE_SPINLOCK(pd_bitmap_lock); 73 74 /* List of all available dev_data structures */ 75 static LLIST_HEAD(dev_data_list); 76 77 LIST_HEAD(ioapic_map); 78 LIST_HEAD(hpet_map); 79 LIST_HEAD(acpihid_map); 80 81 /* 82 * Domain for untranslated devices - only allocated 83 * if iommu=pt passed on kernel cmd line. 84 */ 85 const struct iommu_ops amd_iommu_ops; 86 87 static ATOMIC_NOTIFIER_HEAD(ppr_notifier); 88 int amd_iommu_max_glx_val = -1; 89 90 /* 91 * general struct to manage commands send to an IOMMU 92 */ 93 struct iommu_cmd { 94 u32 data[4]; 95 }; 96 97 struct kmem_cache *amd_iommu_irq_cache; 98 99 static void update_domain(struct protection_domain *domain); 100 static void detach_device(struct device *dev); 101 static void update_and_flush_device_table(struct protection_domain *domain, 102 struct domain_pgtable *pgtable); 103 104 /**************************************************************************** 105 * 106 * Helper functions 107 * 108 ****************************************************************************/ 109 110 static inline u16 get_pci_device_id(struct device *dev) 111 { 112 struct pci_dev *pdev = to_pci_dev(dev); 113 114 return pci_dev_id(pdev); 115 } 116 117 static inline int get_acpihid_device_id(struct device *dev, 118 struct acpihid_map_entry **entry) 119 { 120 struct acpi_device *adev = ACPI_COMPANION(dev); 121 struct acpihid_map_entry *p; 122 123 if (!adev) 124 return -ENODEV; 125 126 list_for_each_entry(p, &acpihid_map, list) { 127 if (acpi_dev_hid_uid_match(adev, p->hid, 128 p->uid[0] ? p->uid : NULL)) { 129 if (entry) 130 *entry = p; 131 return p->devid; 132 } 133 } 134 return -EINVAL; 135 } 136 137 static inline int get_device_id(struct device *dev) 138 { 139 int devid; 140 141 if (dev_is_pci(dev)) 142 devid = get_pci_device_id(dev); 143 else 144 devid = get_acpihid_device_id(dev, NULL); 145 146 return devid; 147 } 148 149 static struct protection_domain *to_pdomain(struct iommu_domain *dom) 150 { 151 return container_of(dom, struct protection_domain, domain); 152 } 153 154 static void amd_iommu_domain_get_pgtable(struct protection_domain *domain, 155 struct domain_pgtable *pgtable) 156 { 157 u64 pt_root = atomic64_read(&domain->pt_root); 158 159 pgtable->root = (u64 *)(pt_root & PAGE_MASK); 160 pgtable->mode = pt_root & 7; /* lowest 3 bits encode pgtable mode */ 161 } 162 163 static void amd_iommu_domain_set_pt_root(struct protection_domain *domain, u64 root) 164 { 165 atomic64_set(&domain->pt_root, root); 166 } 167 168 static void amd_iommu_domain_clr_pt_root(struct protection_domain *domain) 169 { 170 amd_iommu_domain_set_pt_root(domain, 0); 171 } 172 173 static void amd_iommu_domain_set_pgtable(struct protection_domain *domain, 174 u64 *root, int mode) 175 { 176 u64 pt_root; 177 178 /* lowest 3 bits encode pgtable mode */ 179 pt_root = mode & 7; 180 pt_root |= (u64)root; 181 182 amd_iommu_domain_set_pt_root(domain, pt_root); 183 } 184 185 static struct iommu_dev_data *alloc_dev_data(u16 devid) 186 { 187 struct iommu_dev_data *dev_data; 188 189 dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); 190 if (!dev_data) 191 return NULL; 192 193 spin_lock_init(&dev_data->lock); 194 dev_data->devid = devid; 195 ratelimit_default_init(&dev_data->rs); 196 197 llist_add(&dev_data->dev_data_list, &dev_data_list); 198 return dev_data; 199 } 200 201 static struct iommu_dev_data *search_dev_data(u16 devid) 202 { 203 struct iommu_dev_data *dev_data; 204 struct llist_node *node; 205 206 if (llist_empty(&dev_data_list)) 207 return NULL; 208 209 node = dev_data_list.first; 210 llist_for_each_entry(dev_data, node, dev_data_list) { 211 if (dev_data->devid == devid) 212 return dev_data; 213 } 214 215 return NULL; 216 } 217 218 static int clone_alias(struct pci_dev *pdev, u16 alias, void *data) 219 { 220 u16 devid = pci_dev_id(pdev); 221 222 if (devid == alias) 223 return 0; 224 225 amd_iommu_rlookup_table[alias] = 226 amd_iommu_rlookup_table[devid]; 227 memcpy(amd_iommu_dev_table[alias].data, 228 amd_iommu_dev_table[devid].data, 229 sizeof(amd_iommu_dev_table[alias].data)); 230 231 return 0; 232 } 233 234 static void clone_aliases(struct pci_dev *pdev) 235 { 236 if (!pdev) 237 return; 238 239 /* 240 * The IVRS alias stored in the alias table may not be 241 * part of the PCI DMA aliases if it's bus differs 242 * from the original device. 243 */ 244 clone_alias(pdev, amd_iommu_alias_table[pci_dev_id(pdev)], NULL); 245 246 pci_for_each_dma_alias(pdev, clone_alias, NULL); 247 } 248 249 static struct pci_dev *setup_aliases(struct device *dev) 250 { 251 struct pci_dev *pdev = to_pci_dev(dev); 252 u16 ivrs_alias; 253 254 /* For ACPI HID devices, there are no aliases */ 255 if (!dev_is_pci(dev)) 256 return NULL; 257 258 /* 259 * Add the IVRS alias to the pci aliases if it is on the same 260 * bus. The IVRS table may know about a quirk that we don't. 261 */ 262 ivrs_alias = amd_iommu_alias_table[pci_dev_id(pdev)]; 263 if (ivrs_alias != pci_dev_id(pdev) && 264 PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) 265 pci_add_dma_alias(pdev, ivrs_alias & 0xff, 1); 266 267 clone_aliases(pdev); 268 269 return pdev; 270 } 271 272 static struct iommu_dev_data *find_dev_data(u16 devid) 273 { 274 struct iommu_dev_data *dev_data; 275 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; 276 277 dev_data = search_dev_data(devid); 278 279 if (dev_data == NULL) { 280 dev_data = alloc_dev_data(devid); 281 if (!dev_data) 282 return NULL; 283 284 if (translation_pre_enabled(iommu)) 285 dev_data->defer_attach = true; 286 } 287 288 return dev_data; 289 } 290 291 /* 292 * Find or create an IOMMU group for a acpihid device. 293 */ 294 static struct iommu_group *acpihid_device_group(struct device *dev) 295 { 296 struct acpihid_map_entry *p, *entry = NULL; 297 int devid; 298 299 devid = get_acpihid_device_id(dev, &entry); 300 if (devid < 0) 301 return ERR_PTR(devid); 302 303 list_for_each_entry(p, &acpihid_map, list) { 304 if ((devid == p->devid) && p->group) 305 entry->group = p->group; 306 } 307 308 if (!entry->group) 309 entry->group = generic_device_group(dev); 310 else 311 iommu_group_ref_get(entry->group); 312 313 return entry->group; 314 } 315 316 static bool pci_iommuv2_capable(struct pci_dev *pdev) 317 { 318 static const int caps[] = { 319 PCI_EXT_CAP_ID_PRI, 320 PCI_EXT_CAP_ID_PASID, 321 }; 322 int i, pos; 323 324 if (!pci_ats_supported(pdev)) 325 return false; 326 327 for (i = 0; i < 2; ++i) { 328 pos = pci_find_ext_capability(pdev, caps[i]); 329 if (pos == 0) 330 return false; 331 } 332 333 return true; 334 } 335 336 static bool pdev_pri_erratum(struct pci_dev *pdev, u32 erratum) 337 { 338 struct iommu_dev_data *dev_data; 339 340 dev_data = dev_iommu_priv_get(&pdev->dev); 341 342 return dev_data->errata & (1 << erratum) ? true : false; 343 } 344 345 /* 346 * This function checks if the driver got a valid device from the caller to 347 * avoid dereferencing invalid pointers. 348 */ 349 static bool check_device(struct device *dev) 350 { 351 int devid; 352 353 if (!dev) 354 return false; 355 356 devid = get_device_id(dev); 357 if (devid < 0) 358 return false; 359 360 /* Out of our scope? */ 361 if (devid > amd_iommu_last_bdf) 362 return false; 363 364 if (amd_iommu_rlookup_table[devid] == NULL) 365 return false; 366 367 return true; 368 } 369 370 static int iommu_init_device(struct device *dev) 371 { 372 struct iommu_dev_data *dev_data; 373 int devid; 374 375 if (dev_iommu_priv_get(dev)) 376 return 0; 377 378 devid = get_device_id(dev); 379 if (devid < 0) 380 return devid; 381 382 dev_data = find_dev_data(devid); 383 if (!dev_data) 384 return -ENOMEM; 385 386 dev_data->pdev = setup_aliases(dev); 387 388 /* 389 * By default we use passthrough mode for IOMMUv2 capable device. 390 * But if amd_iommu=force_isolation is set (e.g. to debug DMA to 391 * invalid address), we ignore the capability for the device so 392 * it'll be forced to go into translation mode. 393 */ 394 if ((iommu_default_passthrough() || !amd_iommu_force_isolation) && 395 dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) { 396 struct amd_iommu *iommu; 397 398 iommu = amd_iommu_rlookup_table[dev_data->devid]; 399 dev_data->iommu_v2 = iommu->is_iommu_v2; 400 } 401 402 dev_iommu_priv_set(dev, dev_data); 403 404 return 0; 405 } 406 407 static void iommu_ignore_device(struct device *dev) 408 { 409 int devid; 410 411 devid = get_device_id(dev); 412 if (devid < 0) 413 return; 414 415 amd_iommu_rlookup_table[devid] = NULL; 416 memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry)); 417 418 setup_aliases(dev); 419 } 420 421 static void amd_iommu_uninit_device(struct device *dev) 422 { 423 struct iommu_dev_data *dev_data; 424 425 dev_data = dev_iommu_priv_get(dev); 426 if (!dev_data) 427 return; 428 429 if (dev_data->domain) 430 detach_device(dev); 431 432 dev_iommu_priv_set(dev, NULL); 433 434 /* 435 * We keep dev_data around for unplugged devices and reuse it when the 436 * device is re-plugged - not doing so would introduce a ton of races. 437 */ 438 } 439 440 /* 441 * Helper function to get the first pte of a large mapping 442 */ 443 static u64 *first_pte_l7(u64 *pte, unsigned long *page_size, 444 unsigned long *count) 445 { 446 unsigned long pte_mask, pg_size, cnt; 447 u64 *fpte; 448 449 pg_size = PTE_PAGE_SIZE(*pte); 450 cnt = PAGE_SIZE_PTE_COUNT(pg_size); 451 pte_mask = ~((cnt << 3) - 1); 452 fpte = (u64 *)(((unsigned long)pte) & pte_mask); 453 454 if (page_size) 455 *page_size = pg_size; 456 457 if (count) 458 *count = cnt; 459 460 return fpte; 461 } 462 463 /**************************************************************************** 464 * 465 * Interrupt handling functions 466 * 467 ****************************************************************************/ 468 469 static void dump_dte_entry(u16 devid) 470 { 471 int i; 472 473 for (i = 0; i < 4; ++i) 474 pr_err("DTE[%d]: %016llx\n", i, 475 amd_iommu_dev_table[devid].data[i]); 476 } 477 478 static void dump_command(unsigned long phys_addr) 479 { 480 struct iommu_cmd *cmd = iommu_phys_to_virt(phys_addr); 481 int i; 482 483 for (i = 0; i < 4; ++i) 484 pr_err("CMD[%d]: %08x\n", i, cmd->data[i]); 485 } 486 487 static void amd_iommu_report_rmp_hw_error(volatile u32 *event) 488 { 489 struct iommu_dev_data *dev_data = NULL; 490 int devid, vmg_tag, flags; 491 struct pci_dev *pdev; 492 u64 spa; 493 494 devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; 495 vmg_tag = (event[1]) & 0xFFFF; 496 flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; 497 spa = ((u64)event[3] << 32) | (event[2] & 0xFFFFFFF8); 498 499 pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid), 500 devid & 0xff); 501 if (pdev) 502 dev_data = dev_iommu_priv_get(&pdev->dev); 503 504 if (dev_data && __ratelimit(&dev_data->rs)) { 505 pci_err(pdev, "Event logged [RMP_HW_ERROR vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n", 506 vmg_tag, spa, flags); 507 } else { 508 pr_err_ratelimited("Event logged [RMP_HW_ERROR device=%02x:%02x.%x, vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n", 509 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 510 vmg_tag, spa, flags); 511 } 512 513 if (pdev) 514 pci_dev_put(pdev); 515 } 516 517 static void amd_iommu_report_rmp_fault(volatile u32 *event) 518 { 519 struct iommu_dev_data *dev_data = NULL; 520 int devid, flags_rmp, vmg_tag, flags; 521 struct pci_dev *pdev; 522 u64 gpa; 523 524 devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; 525 flags_rmp = (event[0] >> EVENT_FLAGS_SHIFT) & 0xFF; 526 vmg_tag = (event[1]) & 0xFFFF; 527 flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; 528 gpa = ((u64)event[3] << 32) | event[2]; 529 530 pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid), 531 devid & 0xff); 532 if (pdev) 533 dev_data = dev_iommu_priv_get(&pdev->dev); 534 535 if (dev_data && __ratelimit(&dev_data->rs)) { 536 pci_err(pdev, "Event logged [RMP_PAGE_FAULT vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n", 537 vmg_tag, gpa, flags_rmp, flags); 538 } else { 539 pr_err_ratelimited("Event logged [RMP_PAGE_FAULT device=%02x:%02x.%x, vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n", 540 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 541 vmg_tag, gpa, flags_rmp, flags); 542 } 543 544 if (pdev) 545 pci_dev_put(pdev); 546 } 547 548 static void amd_iommu_report_page_fault(u16 devid, u16 domain_id, 549 u64 address, int flags) 550 { 551 struct iommu_dev_data *dev_data = NULL; 552 struct pci_dev *pdev; 553 554 pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid), 555 devid & 0xff); 556 if (pdev) 557 dev_data = dev_iommu_priv_get(&pdev->dev); 558 559 if (dev_data && __ratelimit(&dev_data->rs)) { 560 pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x]\n", 561 domain_id, address, flags); 562 } else if (printk_ratelimit()) { 563 pr_err("Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n", 564 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 565 domain_id, address, flags); 566 } 567 568 if (pdev) 569 pci_dev_put(pdev); 570 } 571 572 static void iommu_print_event(struct amd_iommu *iommu, void *__evt) 573 { 574 struct device *dev = iommu->iommu.dev; 575 int type, devid, flags, tag; 576 volatile u32 *event = __evt; 577 int count = 0; 578 u64 address; 579 u32 pasid; 580 581 retry: 582 type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; 583 devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; 584 pasid = (event[0] & EVENT_DOMID_MASK_HI) | 585 (event[1] & EVENT_DOMID_MASK_LO); 586 flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; 587 address = (u64)(((u64)event[3]) << 32) | event[2]; 588 589 if (type == 0) { 590 /* Did we hit the erratum? */ 591 if (++count == LOOP_TIMEOUT) { 592 pr_err("No event written to event log\n"); 593 return; 594 } 595 udelay(1); 596 goto retry; 597 } 598 599 if (type == EVENT_TYPE_IO_FAULT) { 600 amd_iommu_report_page_fault(devid, pasid, address, flags); 601 return; 602 } 603 604 switch (type) { 605 case EVENT_TYPE_ILL_DEV: 606 dev_err(dev, "Event logged [ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n", 607 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 608 pasid, address, flags); 609 dump_dte_entry(devid); 610 break; 611 case EVENT_TYPE_DEV_TAB_ERR: 612 dev_err(dev, "Event logged [DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " 613 "address=0x%llx flags=0x%04x]\n", 614 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 615 address, flags); 616 break; 617 case EVENT_TYPE_PAGE_TAB_ERR: 618 dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x pasid=0x%04x address=0x%llx flags=0x%04x]\n", 619 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 620 pasid, address, flags); 621 break; 622 case EVENT_TYPE_ILL_CMD: 623 dev_err(dev, "Event logged [ILLEGAL_COMMAND_ERROR address=0x%llx]\n", address); 624 dump_command(address); 625 break; 626 case EVENT_TYPE_CMD_HARD_ERR: 627 dev_err(dev, "Event logged [COMMAND_HARDWARE_ERROR address=0x%llx flags=0x%04x]\n", 628 address, flags); 629 break; 630 case EVENT_TYPE_IOTLB_INV_TO: 631 dev_err(dev, "Event logged [IOTLB_INV_TIMEOUT device=%02x:%02x.%x address=0x%llx]\n", 632 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 633 address); 634 break; 635 case EVENT_TYPE_INV_DEV_REQ: 636 dev_err(dev, "Event logged [INVALID_DEVICE_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n", 637 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 638 pasid, address, flags); 639 break; 640 case EVENT_TYPE_RMP_FAULT: 641 amd_iommu_report_rmp_fault(event); 642 break; 643 case EVENT_TYPE_RMP_HW_ERR: 644 amd_iommu_report_rmp_hw_error(event); 645 break; 646 case EVENT_TYPE_INV_PPR_REQ: 647 pasid = PPR_PASID(*((u64 *)__evt)); 648 tag = event[1] & 0x03FF; 649 dev_err(dev, "Event logged [INVALID_PPR_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x tag=0x%03x]\n", 650 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 651 pasid, address, flags, tag); 652 break; 653 default: 654 dev_err(dev, "Event logged [UNKNOWN event[0]=0x%08x event[1]=0x%08x event[2]=0x%08x event[3]=0x%08x\n", 655 event[0], event[1], event[2], event[3]); 656 } 657 658 memset(__evt, 0, 4 * sizeof(u32)); 659 } 660 661 static void iommu_poll_events(struct amd_iommu *iommu) 662 { 663 u32 head, tail; 664 665 head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); 666 tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); 667 668 while (head != tail) { 669 iommu_print_event(iommu, iommu->evt_buf + head); 670 head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE; 671 } 672 673 writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); 674 } 675 676 static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw) 677 { 678 struct amd_iommu_fault fault; 679 680 if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) { 681 pr_err_ratelimited("Unknown PPR request received\n"); 682 return; 683 } 684 685 fault.address = raw[1]; 686 fault.pasid = PPR_PASID(raw[0]); 687 fault.device_id = PPR_DEVID(raw[0]); 688 fault.tag = PPR_TAG(raw[0]); 689 fault.flags = PPR_FLAGS(raw[0]); 690 691 atomic_notifier_call_chain(&ppr_notifier, 0, &fault); 692 } 693 694 static void iommu_poll_ppr_log(struct amd_iommu *iommu) 695 { 696 u32 head, tail; 697 698 if (iommu->ppr_log == NULL) 699 return; 700 701 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 702 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); 703 704 while (head != tail) { 705 volatile u64 *raw; 706 u64 entry[2]; 707 int i; 708 709 raw = (u64 *)(iommu->ppr_log + head); 710 711 /* 712 * Hardware bug: Interrupt may arrive before the entry is 713 * written to memory. If this happens we need to wait for the 714 * entry to arrive. 715 */ 716 for (i = 0; i < LOOP_TIMEOUT; ++i) { 717 if (PPR_REQ_TYPE(raw[0]) != 0) 718 break; 719 udelay(1); 720 } 721 722 /* Avoid memcpy function-call overhead */ 723 entry[0] = raw[0]; 724 entry[1] = raw[1]; 725 726 /* 727 * To detect the hardware bug we need to clear the entry 728 * back to zero. 729 */ 730 raw[0] = raw[1] = 0UL; 731 732 /* Update head pointer of hardware ring-buffer */ 733 head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE; 734 writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 735 736 /* Handle PPR entry */ 737 iommu_handle_ppr_entry(iommu, entry); 738 739 /* Refresh ring-buffer information */ 740 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 741 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); 742 } 743 } 744 745 #ifdef CONFIG_IRQ_REMAP 746 static int (*iommu_ga_log_notifier)(u32); 747 748 int amd_iommu_register_ga_log_notifier(int (*notifier)(u32)) 749 { 750 iommu_ga_log_notifier = notifier; 751 752 return 0; 753 } 754 EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier); 755 756 static void iommu_poll_ga_log(struct amd_iommu *iommu) 757 { 758 u32 head, tail, cnt = 0; 759 760 if (iommu->ga_log == NULL) 761 return; 762 763 head = readl(iommu->mmio_base + MMIO_GA_HEAD_OFFSET); 764 tail = readl(iommu->mmio_base + MMIO_GA_TAIL_OFFSET); 765 766 while (head != tail) { 767 volatile u64 *raw; 768 u64 log_entry; 769 770 raw = (u64 *)(iommu->ga_log + head); 771 cnt++; 772 773 /* Avoid memcpy function-call overhead */ 774 log_entry = *raw; 775 776 /* Update head pointer of hardware ring-buffer */ 777 head = (head + GA_ENTRY_SIZE) % GA_LOG_SIZE; 778 writel(head, iommu->mmio_base + MMIO_GA_HEAD_OFFSET); 779 780 /* Handle GA entry */ 781 switch (GA_REQ_TYPE(log_entry)) { 782 case GA_GUEST_NR: 783 if (!iommu_ga_log_notifier) 784 break; 785 786 pr_debug("%s: devid=%#x, ga_tag=%#x\n", 787 __func__, GA_DEVID(log_entry), 788 GA_TAG(log_entry)); 789 790 if (iommu_ga_log_notifier(GA_TAG(log_entry)) != 0) 791 pr_err("GA log notifier failed.\n"); 792 break; 793 default: 794 break; 795 } 796 } 797 } 798 799 static void 800 amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu) 801 { 802 if (!irq_remapping_enabled || !dev_is_pci(dev) || 803 pci_dev_has_special_msi_domain(to_pci_dev(dev))) 804 return; 805 806 dev_set_msi_domain(dev, iommu->msi_domain); 807 } 808 809 #else /* CONFIG_IRQ_REMAP */ 810 static inline void 811 amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu) { } 812 #endif /* !CONFIG_IRQ_REMAP */ 813 814 #define AMD_IOMMU_INT_MASK \ 815 (MMIO_STATUS_EVT_INT_MASK | \ 816 MMIO_STATUS_PPR_INT_MASK | \ 817 MMIO_STATUS_GALOG_INT_MASK) 818 819 irqreturn_t amd_iommu_int_thread(int irq, void *data) 820 { 821 struct amd_iommu *iommu = (struct amd_iommu *) data; 822 u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); 823 824 while (status & AMD_IOMMU_INT_MASK) { 825 /* Enable EVT and PPR and GA interrupts again */ 826 writel(AMD_IOMMU_INT_MASK, 827 iommu->mmio_base + MMIO_STATUS_OFFSET); 828 829 if (status & MMIO_STATUS_EVT_INT_MASK) { 830 pr_devel("Processing IOMMU Event Log\n"); 831 iommu_poll_events(iommu); 832 } 833 834 if (status & MMIO_STATUS_PPR_INT_MASK) { 835 pr_devel("Processing IOMMU PPR Log\n"); 836 iommu_poll_ppr_log(iommu); 837 } 838 839 #ifdef CONFIG_IRQ_REMAP 840 if (status & MMIO_STATUS_GALOG_INT_MASK) { 841 pr_devel("Processing IOMMU GA Log\n"); 842 iommu_poll_ga_log(iommu); 843 } 844 #endif 845 846 /* 847 * Hardware bug: ERBT1312 848 * When re-enabling interrupt (by writing 1 849 * to clear the bit), the hardware might also try to set 850 * the interrupt bit in the event status register. 851 * In this scenario, the bit will be set, and disable 852 * subsequent interrupts. 853 * 854 * Workaround: The IOMMU driver should read back the 855 * status register and check if the interrupt bits are cleared. 856 * If not, driver will need to go through the interrupt handler 857 * again and re-clear the bits 858 */ 859 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); 860 } 861 return IRQ_HANDLED; 862 } 863 864 irqreturn_t amd_iommu_int_handler(int irq, void *data) 865 { 866 return IRQ_WAKE_THREAD; 867 } 868 869 /**************************************************************************** 870 * 871 * IOMMU command queuing functions 872 * 873 ****************************************************************************/ 874 875 static int wait_on_sem(struct amd_iommu *iommu, u64 data) 876 { 877 int i = 0; 878 879 while (*iommu->cmd_sem != data && i < LOOP_TIMEOUT) { 880 udelay(1); 881 i += 1; 882 } 883 884 if (i == LOOP_TIMEOUT) { 885 pr_alert("Completion-Wait loop timed out\n"); 886 return -EIO; 887 } 888 889 return 0; 890 } 891 892 static void copy_cmd_to_buffer(struct amd_iommu *iommu, 893 struct iommu_cmd *cmd) 894 { 895 u8 *target; 896 u32 tail; 897 898 /* Copy command to buffer */ 899 tail = iommu->cmd_buf_tail; 900 target = iommu->cmd_buf + tail; 901 memcpy(target, cmd, sizeof(*cmd)); 902 903 tail = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE; 904 iommu->cmd_buf_tail = tail; 905 906 /* Tell the IOMMU about it */ 907 writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); 908 } 909 910 static void build_completion_wait(struct iommu_cmd *cmd, 911 struct amd_iommu *iommu, 912 u64 data) 913 { 914 u64 paddr = iommu_virt_to_phys((void *)iommu->cmd_sem); 915 916 memset(cmd, 0, sizeof(*cmd)); 917 cmd->data[0] = lower_32_bits(paddr) | CMD_COMPL_WAIT_STORE_MASK; 918 cmd->data[1] = upper_32_bits(paddr); 919 cmd->data[2] = data; 920 CMD_SET_TYPE(cmd, CMD_COMPL_WAIT); 921 } 922 923 static void build_inv_dte(struct iommu_cmd *cmd, u16 devid) 924 { 925 memset(cmd, 0, sizeof(*cmd)); 926 cmd->data[0] = devid; 927 CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY); 928 } 929 930 static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, 931 size_t size, u16 domid, int pde) 932 { 933 u64 pages; 934 bool s; 935 936 pages = iommu_num_pages(address, size, PAGE_SIZE); 937 s = false; 938 939 if (pages > 1) { 940 /* 941 * If we have to flush more than one page, flush all 942 * TLB entries for this domain 943 */ 944 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; 945 s = true; 946 } 947 948 address &= PAGE_MASK; 949 950 memset(cmd, 0, sizeof(*cmd)); 951 cmd->data[1] |= domid; 952 cmd->data[2] = lower_32_bits(address); 953 cmd->data[3] = upper_32_bits(address); 954 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); 955 if (s) /* size bit - we flush more than one 4kb page */ 956 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; 957 if (pde) /* PDE bit - we want to flush everything, not only the PTEs */ 958 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; 959 } 960 961 static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep, 962 u64 address, size_t size) 963 { 964 u64 pages; 965 bool s; 966 967 pages = iommu_num_pages(address, size, PAGE_SIZE); 968 s = false; 969 970 if (pages > 1) { 971 /* 972 * If we have to flush more than one page, flush all 973 * TLB entries for this domain 974 */ 975 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; 976 s = true; 977 } 978 979 address &= PAGE_MASK; 980 981 memset(cmd, 0, sizeof(*cmd)); 982 cmd->data[0] = devid; 983 cmd->data[0] |= (qdep & 0xff) << 24; 984 cmd->data[1] = devid; 985 cmd->data[2] = lower_32_bits(address); 986 cmd->data[3] = upper_32_bits(address); 987 CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES); 988 if (s) 989 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; 990 } 991 992 static void build_inv_iommu_pasid(struct iommu_cmd *cmd, u16 domid, u32 pasid, 993 u64 address, bool size) 994 { 995 memset(cmd, 0, sizeof(*cmd)); 996 997 address &= ~(0xfffULL); 998 999 cmd->data[0] = pasid; 1000 cmd->data[1] = domid; 1001 cmd->data[2] = lower_32_bits(address); 1002 cmd->data[3] = upper_32_bits(address); 1003 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; 1004 cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK; 1005 if (size) 1006 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; 1007 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); 1008 } 1009 1010 static void build_inv_iotlb_pasid(struct iommu_cmd *cmd, u16 devid, u32 pasid, 1011 int qdep, u64 address, bool size) 1012 { 1013 memset(cmd, 0, sizeof(*cmd)); 1014 1015 address &= ~(0xfffULL); 1016 1017 cmd->data[0] = devid; 1018 cmd->data[0] |= ((pasid >> 8) & 0xff) << 16; 1019 cmd->data[0] |= (qdep & 0xff) << 24; 1020 cmd->data[1] = devid; 1021 cmd->data[1] |= (pasid & 0xff) << 16; 1022 cmd->data[2] = lower_32_bits(address); 1023 cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK; 1024 cmd->data[3] = upper_32_bits(address); 1025 if (size) 1026 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; 1027 CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES); 1028 } 1029 1030 static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, u32 pasid, 1031 int status, int tag, bool gn) 1032 { 1033 memset(cmd, 0, sizeof(*cmd)); 1034 1035 cmd->data[0] = devid; 1036 if (gn) { 1037 cmd->data[1] = pasid; 1038 cmd->data[2] = CMD_INV_IOMMU_PAGES_GN_MASK; 1039 } 1040 cmd->data[3] = tag & 0x1ff; 1041 cmd->data[3] |= (status & PPR_STATUS_MASK) << PPR_STATUS_SHIFT; 1042 1043 CMD_SET_TYPE(cmd, CMD_COMPLETE_PPR); 1044 } 1045 1046 static void build_inv_all(struct iommu_cmd *cmd) 1047 { 1048 memset(cmd, 0, sizeof(*cmd)); 1049 CMD_SET_TYPE(cmd, CMD_INV_ALL); 1050 } 1051 1052 static void build_inv_irt(struct iommu_cmd *cmd, u16 devid) 1053 { 1054 memset(cmd, 0, sizeof(*cmd)); 1055 cmd->data[0] = devid; 1056 CMD_SET_TYPE(cmd, CMD_INV_IRT); 1057 } 1058 1059 /* 1060 * Writes the command to the IOMMUs command buffer and informs the 1061 * hardware about the new command. 1062 */ 1063 static int __iommu_queue_command_sync(struct amd_iommu *iommu, 1064 struct iommu_cmd *cmd, 1065 bool sync) 1066 { 1067 unsigned int count = 0; 1068 u32 left, next_tail; 1069 1070 next_tail = (iommu->cmd_buf_tail + sizeof(*cmd)) % CMD_BUFFER_SIZE; 1071 again: 1072 left = (iommu->cmd_buf_head - next_tail) % CMD_BUFFER_SIZE; 1073 1074 if (left <= 0x20) { 1075 /* Skip udelay() the first time around */ 1076 if (count++) { 1077 if (count == LOOP_TIMEOUT) { 1078 pr_err("Command buffer timeout\n"); 1079 return -EIO; 1080 } 1081 1082 udelay(1); 1083 } 1084 1085 /* Update head and recheck remaining space */ 1086 iommu->cmd_buf_head = readl(iommu->mmio_base + 1087 MMIO_CMD_HEAD_OFFSET); 1088 1089 goto again; 1090 } 1091 1092 copy_cmd_to_buffer(iommu, cmd); 1093 1094 /* Do we need to make sure all commands are processed? */ 1095 iommu->need_sync = sync; 1096 1097 return 0; 1098 } 1099 1100 static int iommu_queue_command_sync(struct amd_iommu *iommu, 1101 struct iommu_cmd *cmd, 1102 bool sync) 1103 { 1104 unsigned long flags; 1105 int ret; 1106 1107 raw_spin_lock_irqsave(&iommu->lock, flags); 1108 ret = __iommu_queue_command_sync(iommu, cmd, sync); 1109 raw_spin_unlock_irqrestore(&iommu->lock, flags); 1110 1111 return ret; 1112 } 1113 1114 static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) 1115 { 1116 return iommu_queue_command_sync(iommu, cmd, true); 1117 } 1118 1119 /* 1120 * This function queues a completion wait command into the command 1121 * buffer of an IOMMU 1122 */ 1123 static int iommu_completion_wait(struct amd_iommu *iommu) 1124 { 1125 struct iommu_cmd cmd; 1126 unsigned long flags; 1127 int ret; 1128 u64 data; 1129 1130 if (!iommu->need_sync) 1131 return 0; 1132 1133 raw_spin_lock_irqsave(&iommu->lock, flags); 1134 1135 data = ++iommu->cmd_sem_val; 1136 build_completion_wait(&cmd, iommu, data); 1137 1138 ret = __iommu_queue_command_sync(iommu, &cmd, false); 1139 if (ret) 1140 goto out_unlock; 1141 1142 ret = wait_on_sem(iommu, data); 1143 1144 out_unlock: 1145 raw_spin_unlock_irqrestore(&iommu->lock, flags); 1146 1147 return ret; 1148 } 1149 1150 static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid) 1151 { 1152 struct iommu_cmd cmd; 1153 1154 build_inv_dte(&cmd, devid); 1155 1156 return iommu_queue_command(iommu, &cmd); 1157 } 1158 1159 static void amd_iommu_flush_dte_all(struct amd_iommu *iommu) 1160 { 1161 u32 devid; 1162 1163 for (devid = 0; devid <= 0xffff; ++devid) 1164 iommu_flush_dte(iommu, devid); 1165 1166 iommu_completion_wait(iommu); 1167 } 1168 1169 /* 1170 * This function uses heavy locking and may disable irqs for some time. But 1171 * this is no issue because it is only called during resume. 1172 */ 1173 static void amd_iommu_flush_tlb_all(struct amd_iommu *iommu) 1174 { 1175 u32 dom_id; 1176 1177 for (dom_id = 0; dom_id <= 0xffff; ++dom_id) { 1178 struct iommu_cmd cmd; 1179 build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1180 dom_id, 1); 1181 iommu_queue_command(iommu, &cmd); 1182 } 1183 1184 iommu_completion_wait(iommu); 1185 } 1186 1187 static void amd_iommu_flush_tlb_domid(struct amd_iommu *iommu, u32 dom_id) 1188 { 1189 struct iommu_cmd cmd; 1190 1191 build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1192 dom_id, 1); 1193 iommu_queue_command(iommu, &cmd); 1194 1195 iommu_completion_wait(iommu); 1196 } 1197 1198 static void amd_iommu_flush_all(struct amd_iommu *iommu) 1199 { 1200 struct iommu_cmd cmd; 1201 1202 build_inv_all(&cmd); 1203 1204 iommu_queue_command(iommu, &cmd); 1205 iommu_completion_wait(iommu); 1206 } 1207 1208 static void iommu_flush_irt(struct amd_iommu *iommu, u16 devid) 1209 { 1210 struct iommu_cmd cmd; 1211 1212 build_inv_irt(&cmd, devid); 1213 1214 iommu_queue_command(iommu, &cmd); 1215 } 1216 1217 static void amd_iommu_flush_irt_all(struct amd_iommu *iommu) 1218 { 1219 u32 devid; 1220 1221 for (devid = 0; devid <= MAX_DEV_TABLE_ENTRIES; devid++) 1222 iommu_flush_irt(iommu, devid); 1223 1224 iommu_completion_wait(iommu); 1225 } 1226 1227 void iommu_flush_all_caches(struct amd_iommu *iommu) 1228 { 1229 if (iommu_feature(iommu, FEATURE_IA)) { 1230 amd_iommu_flush_all(iommu); 1231 } else { 1232 amd_iommu_flush_dte_all(iommu); 1233 amd_iommu_flush_irt_all(iommu); 1234 amd_iommu_flush_tlb_all(iommu); 1235 } 1236 } 1237 1238 /* 1239 * Command send function for flushing on-device TLB 1240 */ 1241 static int device_flush_iotlb(struct iommu_dev_data *dev_data, 1242 u64 address, size_t size) 1243 { 1244 struct amd_iommu *iommu; 1245 struct iommu_cmd cmd; 1246 int qdep; 1247 1248 qdep = dev_data->ats.qdep; 1249 iommu = amd_iommu_rlookup_table[dev_data->devid]; 1250 1251 build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size); 1252 1253 return iommu_queue_command(iommu, &cmd); 1254 } 1255 1256 static int device_flush_dte_alias(struct pci_dev *pdev, u16 alias, void *data) 1257 { 1258 struct amd_iommu *iommu = data; 1259 1260 return iommu_flush_dte(iommu, alias); 1261 } 1262 1263 /* 1264 * Command send function for invalidating a device table entry 1265 */ 1266 static int device_flush_dte(struct iommu_dev_data *dev_data) 1267 { 1268 struct amd_iommu *iommu; 1269 u16 alias; 1270 int ret; 1271 1272 iommu = amd_iommu_rlookup_table[dev_data->devid]; 1273 1274 if (dev_data->pdev) 1275 ret = pci_for_each_dma_alias(dev_data->pdev, 1276 device_flush_dte_alias, iommu); 1277 else 1278 ret = iommu_flush_dte(iommu, dev_data->devid); 1279 if (ret) 1280 return ret; 1281 1282 alias = amd_iommu_alias_table[dev_data->devid]; 1283 if (alias != dev_data->devid) { 1284 ret = iommu_flush_dte(iommu, alias); 1285 if (ret) 1286 return ret; 1287 } 1288 1289 if (dev_data->ats.enabled) 1290 ret = device_flush_iotlb(dev_data, 0, ~0UL); 1291 1292 return ret; 1293 } 1294 1295 /* 1296 * TLB invalidation function which is called from the mapping functions. 1297 * It invalidates a single PTE if the range to flush is within a single 1298 * page. Otherwise it flushes the whole TLB of the IOMMU. 1299 */ 1300 static void __domain_flush_pages(struct protection_domain *domain, 1301 u64 address, size_t size, int pde) 1302 { 1303 struct iommu_dev_data *dev_data; 1304 struct iommu_cmd cmd; 1305 int ret = 0, i; 1306 1307 build_inv_iommu_pages(&cmd, address, size, domain->id, pde); 1308 1309 for (i = 0; i < amd_iommu_get_num_iommus(); ++i) { 1310 if (!domain->dev_iommu[i]) 1311 continue; 1312 1313 /* 1314 * Devices of this domain are behind this IOMMU 1315 * We need a TLB flush 1316 */ 1317 ret |= iommu_queue_command(amd_iommus[i], &cmd); 1318 } 1319 1320 list_for_each_entry(dev_data, &domain->dev_list, list) { 1321 1322 if (!dev_data->ats.enabled) 1323 continue; 1324 1325 ret |= device_flush_iotlb(dev_data, address, size); 1326 } 1327 1328 WARN_ON(ret); 1329 } 1330 1331 static void domain_flush_pages(struct protection_domain *domain, 1332 u64 address, size_t size) 1333 { 1334 __domain_flush_pages(domain, address, size, 0); 1335 } 1336 1337 /* Flush the whole IO/TLB for a given protection domain - including PDE */ 1338 static void domain_flush_tlb_pde(struct protection_domain *domain) 1339 { 1340 __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1); 1341 } 1342 1343 static void domain_flush_complete(struct protection_domain *domain) 1344 { 1345 int i; 1346 1347 for (i = 0; i < amd_iommu_get_num_iommus(); ++i) { 1348 if (domain && !domain->dev_iommu[i]) 1349 continue; 1350 1351 /* 1352 * Devices of this domain are behind this IOMMU 1353 * We need to wait for completion of all commands. 1354 */ 1355 iommu_completion_wait(amd_iommus[i]); 1356 } 1357 } 1358 1359 /* Flush the not present cache if it exists */ 1360 static void domain_flush_np_cache(struct protection_domain *domain, 1361 dma_addr_t iova, size_t size) 1362 { 1363 if (unlikely(amd_iommu_np_cache)) { 1364 unsigned long flags; 1365 1366 spin_lock_irqsave(&domain->lock, flags); 1367 domain_flush_pages(domain, iova, size); 1368 domain_flush_complete(domain); 1369 spin_unlock_irqrestore(&domain->lock, flags); 1370 } 1371 } 1372 1373 1374 /* 1375 * This function flushes the DTEs for all devices in domain 1376 */ 1377 static void domain_flush_devices(struct protection_domain *domain) 1378 { 1379 struct iommu_dev_data *dev_data; 1380 1381 list_for_each_entry(dev_data, &domain->dev_list, list) 1382 device_flush_dte(dev_data); 1383 } 1384 1385 /**************************************************************************** 1386 * 1387 * The functions below are used the create the page table mappings for 1388 * unity mapped regions. 1389 * 1390 ****************************************************************************/ 1391 1392 static void free_page_list(struct page *freelist) 1393 { 1394 while (freelist != NULL) { 1395 unsigned long p = (unsigned long)page_address(freelist); 1396 freelist = freelist->freelist; 1397 free_page(p); 1398 } 1399 } 1400 1401 static struct page *free_pt_page(unsigned long pt, struct page *freelist) 1402 { 1403 struct page *p = virt_to_page((void *)pt); 1404 1405 p->freelist = freelist; 1406 1407 return p; 1408 } 1409 1410 #define DEFINE_FREE_PT_FN(LVL, FN) \ 1411 static struct page *free_pt_##LVL (unsigned long __pt, struct page *freelist) \ 1412 { \ 1413 unsigned long p; \ 1414 u64 *pt; \ 1415 int i; \ 1416 \ 1417 pt = (u64 *)__pt; \ 1418 \ 1419 for (i = 0; i < 512; ++i) { \ 1420 /* PTE present? */ \ 1421 if (!IOMMU_PTE_PRESENT(pt[i])) \ 1422 continue; \ 1423 \ 1424 /* Large PTE? */ \ 1425 if (PM_PTE_LEVEL(pt[i]) == 0 || \ 1426 PM_PTE_LEVEL(pt[i]) == 7) \ 1427 continue; \ 1428 \ 1429 p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \ 1430 freelist = FN(p, freelist); \ 1431 } \ 1432 \ 1433 return free_pt_page((unsigned long)pt, freelist); \ 1434 } 1435 1436 DEFINE_FREE_PT_FN(l2, free_pt_page) 1437 DEFINE_FREE_PT_FN(l3, free_pt_l2) 1438 DEFINE_FREE_PT_FN(l4, free_pt_l3) 1439 DEFINE_FREE_PT_FN(l5, free_pt_l4) 1440 DEFINE_FREE_PT_FN(l6, free_pt_l5) 1441 1442 static struct page *free_sub_pt(unsigned long root, int mode, 1443 struct page *freelist) 1444 { 1445 switch (mode) { 1446 case PAGE_MODE_NONE: 1447 case PAGE_MODE_7_LEVEL: 1448 break; 1449 case PAGE_MODE_1_LEVEL: 1450 freelist = free_pt_page(root, freelist); 1451 break; 1452 case PAGE_MODE_2_LEVEL: 1453 freelist = free_pt_l2(root, freelist); 1454 break; 1455 case PAGE_MODE_3_LEVEL: 1456 freelist = free_pt_l3(root, freelist); 1457 break; 1458 case PAGE_MODE_4_LEVEL: 1459 freelist = free_pt_l4(root, freelist); 1460 break; 1461 case PAGE_MODE_5_LEVEL: 1462 freelist = free_pt_l5(root, freelist); 1463 break; 1464 case PAGE_MODE_6_LEVEL: 1465 freelist = free_pt_l6(root, freelist); 1466 break; 1467 default: 1468 BUG(); 1469 } 1470 1471 return freelist; 1472 } 1473 1474 static void free_pagetable(struct domain_pgtable *pgtable) 1475 { 1476 struct page *freelist = NULL; 1477 unsigned long root; 1478 1479 if (pgtable->mode == PAGE_MODE_NONE) 1480 return; 1481 1482 BUG_ON(pgtable->mode < PAGE_MODE_NONE || 1483 pgtable->mode > PAGE_MODE_6_LEVEL); 1484 1485 root = (unsigned long)pgtable->root; 1486 freelist = free_sub_pt(root, pgtable->mode, freelist); 1487 1488 free_page_list(freelist); 1489 } 1490 1491 /* 1492 * This function is used to add another level to an IO page table. Adding 1493 * another level increases the size of the address space by 9 bits to a size up 1494 * to 64 bits. 1495 */ 1496 static bool increase_address_space(struct protection_domain *domain, 1497 unsigned long address, 1498 gfp_t gfp) 1499 { 1500 struct domain_pgtable pgtable; 1501 unsigned long flags; 1502 bool ret = true; 1503 u64 *pte; 1504 1505 spin_lock_irqsave(&domain->lock, flags); 1506 1507 amd_iommu_domain_get_pgtable(domain, &pgtable); 1508 1509 if (address <= PM_LEVEL_SIZE(pgtable.mode)) 1510 goto out; 1511 1512 ret = false; 1513 if (WARN_ON_ONCE(pgtable.mode == PAGE_MODE_6_LEVEL)) 1514 goto out; 1515 1516 pte = (void *)get_zeroed_page(gfp); 1517 if (!pte) 1518 goto out; 1519 1520 *pte = PM_LEVEL_PDE(pgtable.mode, iommu_virt_to_phys(pgtable.root)); 1521 1522 pgtable.root = pte; 1523 pgtable.mode += 1; 1524 update_and_flush_device_table(domain, &pgtable); 1525 domain_flush_complete(domain); 1526 1527 /* 1528 * Device Table needs to be updated and flushed before the new root can 1529 * be published. 1530 */ 1531 amd_iommu_domain_set_pgtable(domain, pte, pgtable.mode); 1532 1533 ret = true; 1534 1535 out: 1536 spin_unlock_irqrestore(&domain->lock, flags); 1537 1538 return ret; 1539 } 1540 1541 static u64 *alloc_pte(struct protection_domain *domain, 1542 unsigned long address, 1543 unsigned long page_size, 1544 u64 **pte_page, 1545 gfp_t gfp, 1546 bool *updated) 1547 { 1548 struct domain_pgtable pgtable; 1549 int level, end_lvl; 1550 u64 *pte, *page; 1551 1552 BUG_ON(!is_power_of_2(page_size)); 1553 1554 amd_iommu_domain_get_pgtable(domain, &pgtable); 1555 1556 while (address > PM_LEVEL_SIZE(pgtable.mode)) { 1557 /* 1558 * Return an error if there is no memory to update the 1559 * page-table. 1560 */ 1561 if (!increase_address_space(domain, address, gfp)) 1562 return NULL; 1563 1564 /* Read new values to check if update was successful */ 1565 amd_iommu_domain_get_pgtable(domain, &pgtable); 1566 } 1567 1568 1569 level = pgtable.mode - 1; 1570 pte = &pgtable.root[PM_LEVEL_INDEX(level, address)]; 1571 address = PAGE_SIZE_ALIGN(address, page_size); 1572 end_lvl = PAGE_SIZE_LEVEL(page_size); 1573 1574 while (level > end_lvl) { 1575 u64 __pte, __npte; 1576 int pte_level; 1577 1578 __pte = *pte; 1579 pte_level = PM_PTE_LEVEL(__pte); 1580 1581 /* 1582 * If we replace a series of large PTEs, we need 1583 * to tear down all of them. 1584 */ 1585 if (IOMMU_PTE_PRESENT(__pte) && 1586 pte_level == PAGE_MODE_7_LEVEL) { 1587 unsigned long count, i; 1588 u64 *lpte; 1589 1590 lpte = first_pte_l7(pte, NULL, &count); 1591 1592 /* 1593 * Unmap the replicated PTEs that still match the 1594 * original large mapping 1595 */ 1596 for (i = 0; i < count; ++i) 1597 cmpxchg64(&lpte[i], __pte, 0ULL); 1598 1599 *updated = true; 1600 continue; 1601 } 1602 1603 if (!IOMMU_PTE_PRESENT(__pte) || 1604 pte_level == PAGE_MODE_NONE) { 1605 page = (u64 *)get_zeroed_page(gfp); 1606 1607 if (!page) 1608 return NULL; 1609 1610 __npte = PM_LEVEL_PDE(level, iommu_virt_to_phys(page)); 1611 1612 /* pte could have been changed somewhere. */ 1613 if (cmpxchg64(pte, __pte, __npte) != __pte) 1614 free_page((unsigned long)page); 1615 else if (IOMMU_PTE_PRESENT(__pte)) 1616 *updated = true; 1617 1618 continue; 1619 } 1620 1621 /* No level skipping support yet */ 1622 if (pte_level != level) 1623 return NULL; 1624 1625 level -= 1; 1626 1627 pte = IOMMU_PTE_PAGE(__pte); 1628 1629 if (pte_page && level == end_lvl) 1630 *pte_page = pte; 1631 1632 pte = &pte[PM_LEVEL_INDEX(level, address)]; 1633 } 1634 1635 return pte; 1636 } 1637 1638 /* 1639 * This function checks if there is a PTE for a given dma address. If 1640 * there is one, it returns the pointer to it. 1641 */ 1642 static u64 *fetch_pte(struct protection_domain *domain, 1643 unsigned long address, 1644 unsigned long *page_size) 1645 { 1646 struct domain_pgtable pgtable; 1647 int level; 1648 u64 *pte; 1649 1650 *page_size = 0; 1651 1652 amd_iommu_domain_get_pgtable(domain, &pgtable); 1653 1654 if (address > PM_LEVEL_SIZE(pgtable.mode)) 1655 return NULL; 1656 1657 level = pgtable.mode - 1; 1658 pte = &pgtable.root[PM_LEVEL_INDEX(level, address)]; 1659 *page_size = PTE_LEVEL_PAGE_SIZE(level); 1660 1661 while (level > 0) { 1662 1663 /* Not Present */ 1664 if (!IOMMU_PTE_PRESENT(*pte)) 1665 return NULL; 1666 1667 /* Large PTE */ 1668 if (PM_PTE_LEVEL(*pte) == 7 || 1669 PM_PTE_LEVEL(*pte) == 0) 1670 break; 1671 1672 /* No level skipping support yet */ 1673 if (PM_PTE_LEVEL(*pte) != level) 1674 return NULL; 1675 1676 level -= 1; 1677 1678 /* Walk to the next level */ 1679 pte = IOMMU_PTE_PAGE(*pte); 1680 pte = &pte[PM_LEVEL_INDEX(level, address)]; 1681 *page_size = PTE_LEVEL_PAGE_SIZE(level); 1682 } 1683 1684 /* 1685 * If we have a series of large PTEs, make 1686 * sure to return a pointer to the first one. 1687 */ 1688 if (PM_PTE_LEVEL(*pte) == PAGE_MODE_7_LEVEL) 1689 pte = first_pte_l7(pte, page_size, NULL); 1690 1691 return pte; 1692 } 1693 1694 static struct page *free_clear_pte(u64 *pte, u64 pteval, struct page *freelist) 1695 { 1696 unsigned long pt; 1697 int mode; 1698 1699 while (cmpxchg64(pte, pteval, 0) != pteval) { 1700 pr_warn("AMD-Vi: IOMMU pte changed since we read it\n"); 1701 pteval = *pte; 1702 } 1703 1704 if (!IOMMU_PTE_PRESENT(pteval)) 1705 return freelist; 1706 1707 pt = (unsigned long)IOMMU_PTE_PAGE(pteval); 1708 mode = IOMMU_PTE_MODE(pteval); 1709 1710 return free_sub_pt(pt, mode, freelist); 1711 } 1712 1713 /* 1714 * Generic mapping functions. It maps a physical address into a DMA 1715 * address space. It allocates the page table pages if necessary. 1716 * In the future it can be extended to a generic mapping function 1717 * supporting all features of AMD IOMMU page tables like level skipping 1718 * and full 64 bit address spaces. 1719 */ 1720 static int iommu_map_page(struct protection_domain *dom, 1721 unsigned long bus_addr, 1722 unsigned long phys_addr, 1723 unsigned long page_size, 1724 int prot, 1725 gfp_t gfp) 1726 { 1727 struct page *freelist = NULL; 1728 bool updated = false; 1729 u64 __pte, *pte; 1730 int ret, i, count; 1731 1732 BUG_ON(!IS_ALIGNED(bus_addr, page_size)); 1733 BUG_ON(!IS_ALIGNED(phys_addr, page_size)); 1734 1735 ret = -EINVAL; 1736 if (!(prot & IOMMU_PROT_MASK)) 1737 goto out; 1738 1739 count = PAGE_SIZE_PTE_COUNT(page_size); 1740 pte = alloc_pte(dom, bus_addr, page_size, NULL, gfp, &updated); 1741 1742 ret = -ENOMEM; 1743 if (!pte) 1744 goto out; 1745 1746 for (i = 0; i < count; ++i) 1747 freelist = free_clear_pte(&pte[i], pte[i], freelist); 1748 1749 if (freelist != NULL) 1750 updated = true; 1751 1752 if (count > 1) { 1753 __pte = PAGE_SIZE_PTE(__sme_set(phys_addr), page_size); 1754 __pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_PR | IOMMU_PTE_FC; 1755 } else 1756 __pte = __sme_set(phys_addr) | IOMMU_PTE_PR | IOMMU_PTE_FC; 1757 1758 if (prot & IOMMU_PROT_IR) 1759 __pte |= IOMMU_PTE_IR; 1760 if (prot & IOMMU_PROT_IW) 1761 __pte |= IOMMU_PTE_IW; 1762 1763 for (i = 0; i < count; ++i) 1764 pte[i] = __pte; 1765 1766 ret = 0; 1767 1768 out: 1769 if (updated) { 1770 unsigned long flags; 1771 1772 spin_lock_irqsave(&dom->lock, flags); 1773 /* 1774 * Flush domain TLB(s) and wait for completion. Any Device-Table 1775 * Updates and flushing already happened in 1776 * increase_address_space(). 1777 */ 1778 domain_flush_tlb_pde(dom); 1779 domain_flush_complete(dom); 1780 spin_unlock_irqrestore(&dom->lock, flags); 1781 } 1782 1783 /* Everything flushed out, free pages now */ 1784 free_page_list(freelist); 1785 1786 return ret; 1787 } 1788 1789 static unsigned long iommu_unmap_page(struct protection_domain *dom, 1790 unsigned long bus_addr, 1791 unsigned long page_size) 1792 { 1793 unsigned long long unmapped; 1794 unsigned long unmap_size; 1795 u64 *pte; 1796 1797 BUG_ON(!is_power_of_2(page_size)); 1798 1799 unmapped = 0; 1800 1801 while (unmapped < page_size) { 1802 1803 pte = fetch_pte(dom, bus_addr, &unmap_size); 1804 1805 if (pte) { 1806 int i, count; 1807 1808 count = PAGE_SIZE_PTE_COUNT(unmap_size); 1809 for (i = 0; i < count; i++) 1810 pte[i] = 0ULL; 1811 } 1812 1813 bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size; 1814 unmapped += unmap_size; 1815 } 1816 1817 BUG_ON(unmapped && !is_power_of_2(unmapped)); 1818 1819 return unmapped; 1820 } 1821 1822 /**************************************************************************** 1823 * 1824 * The next functions belong to the domain allocation. A domain is 1825 * allocated for every IOMMU as the default domain. If device isolation 1826 * is enabled, every device get its own domain. The most important thing 1827 * about domains is the page table mapping the DMA address space they 1828 * contain. 1829 * 1830 ****************************************************************************/ 1831 1832 static u16 domain_id_alloc(void) 1833 { 1834 int id; 1835 1836 spin_lock(&pd_bitmap_lock); 1837 id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); 1838 BUG_ON(id == 0); 1839 if (id > 0 && id < MAX_DOMAIN_ID) 1840 __set_bit(id, amd_iommu_pd_alloc_bitmap); 1841 else 1842 id = 0; 1843 spin_unlock(&pd_bitmap_lock); 1844 1845 return id; 1846 } 1847 1848 static void domain_id_free(int id) 1849 { 1850 spin_lock(&pd_bitmap_lock); 1851 if (id > 0 && id < MAX_DOMAIN_ID) 1852 __clear_bit(id, amd_iommu_pd_alloc_bitmap); 1853 spin_unlock(&pd_bitmap_lock); 1854 } 1855 1856 static void free_gcr3_tbl_level1(u64 *tbl) 1857 { 1858 u64 *ptr; 1859 int i; 1860 1861 for (i = 0; i < 512; ++i) { 1862 if (!(tbl[i] & GCR3_VALID)) 1863 continue; 1864 1865 ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK); 1866 1867 free_page((unsigned long)ptr); 1868 } 1869 } 1870 1871 static void free_gcr3_tbl_level2(u64 *tbl) 1872 { 1873 u64 *ptr; 1874 int i; 1875 1876 for (i = 0; i < 512; ++i) { 1877 if (!(tbl[i] & GCR3_VALID)) 1878 continue; 1879 1880 ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK); 1881 1882 free_gcr3_tbl_level1(ptr); 1883 } 1884 } 1885 1886 static void free_gcr3_table(struct protection_domain *domain) 1887 { 1888 if (domain->glx == 2) 1889 free_gcr3_tbl_level2(domain->gcr3_tbl); 1890 else if (domain->glx == 1) 1891 free_gcr3_tbl_level1(domain->gcr3_tbl); 1892 else 1893 BUG_ON(domain->glx != 0); 1894 1895 free_page((unsigned long)domain->gcr3_tbl); 1896 } 1897 1898 static void set_dte_entry(u16 devid, struct protection_domain *domain, 1899 struct domain_pgtable *pgtable, 1900 bool ats, bool ppr) 1901 { 1902 u64 pte_root = 0; 1903 u64 flags = 0; 1904 u32 old_domid; 1905 1906 if (pgtable->mode != PAGE_MODE_NONE) 1907 pte_root = iommu_virt_to_phys(pgtable->root); 1908 1909 pte_root |= (pgtable->mode & DEV_ENTRY_MODE_MASK) 1910 << DEV_ENTRY_MODE_SHIFT; 1911 pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV; 1912 1913 flags = amd_iommu_dev_table[devid].data[1]; 1914 1915 if (ats) 1916 flags |= DTE_FLAG_IOTLB; 1917 1918 if (ppr) { 1919 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; 1920 1921 if (iommu_feature(iommu, FEATURE_EPHSUP)) 1922 pte_root |= 1ULL << DEV_ENTRY_PPR; 1923 } 1924 1925 if (domain->flags & PD_IOMMUV2_MASK) { 1926 u64 gcr3 = iommu_virt_to_phys(domain->gcr3_tbl); 1927 u64 glx = domain->glx; 1928 u64 tmp; 1929 1930 pte_root |= DTE_FLAG_GV; 1931 pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT; 1932 1933 /* First mask out possible old values for GCR3 table */ 1934 tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B; 1935 flags &= ~tmp; 1936 1937 tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C; 1938 flags &= ~tmp; 1939 1940 /* Encode GCR3 table into DTE */ 1941 tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A; 1942 pte_root |= tmp; 1943 1944 tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B; 1945 flags |= tmp; 1946 1947 tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C; 1948 flags |= tmp; 1949 } 1950 1951 flags &= ~DEV_DOMID_MASK; 1952 flags |= domain->id; 1953 1954 old_domid = amd_iommu_dev_table[devid].data[1] & DEV_DOMID_MASK; 1955 amd_iommu_dev_table[devid].data[1] = flags; 1956 amd_iommu_dev_table[devid].data[0] = pte_root; 1957 1958 /* 1959 * A kdump kernel might be replacing a domain ID that was copied from 1960 * the previous kernel--if so, it needs to flush the translation cache 1961 * entries for the old domain ID that is being overwritten 1962 */ 1963 if (old_domid) { 1964 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; 1965 1966 amd_iommu_flush_tlb_domid(iommu, old_domid); 1967 } 1968 } 1969 1970 static void clear_dte_entry(u16 devid) 1971 { 1972 /* remove entry from the device table seen by the hardware */ 1973 amd_iommu_dev_table[devid].data[0] = DTE_FLAG_V | DTE_FLAG_TV; 1974 amd_iommu_dev_table[devid].data[1] &= DTE_FLAG_MASK; 1975 1976 amd_iommu_apply_erratum_63(devid); 1977 } 1978 1979 static void do_attach(struct iommu_dev_data *dev_data, 1980 struct protection_domain *domain) 1981 { 1982 struct domain_pgtable pgtable; 1983 struct amd_iommu *iommu; 1984 bool ats; 1985 1986 iommu = amd_iommu_rlookup_table[dev_data->devid]; 1987 ats = dev_data->ats.enabled; 1988 1989 /* Update data structures */ 1990 dev_data->domain = domain; 1991 list_add(&dev_data->list, &domain->dev_list); 1992 1993 /* Do reference counting */ 1994 domain->dev_iommu[iommu->index] += 1; 1995 domain->dev_cnt += 1; 1996 1997 /* Update device table */ 1998 amd_iommu_domain_get_pgtable(domain, &pgtable); 1999 set_dte_entry(dev_data->devid, domain, &pgtable, 2000 ats, dev_data->iommu_v2); 2001 clone_aliases(dev_data->pdev); 2002 2003 device_flush_dte(dev_data); 2004 } 2005 2006 static void do_detach(struct iommu_dev_data *dev_data) 2007 { 2008 struct protection_domain *domain = dev_data->domain; 2009 struct amd_iommu *iommu; 2010 2011 iommu = amd_iommu_rlookup_table[dev_data->devid]; 2012 2013 /* Update data structures */ 2014 dev_data->domain = NULL; 2015 list_del(&dev_data->list); 2016 clear_dte_entry(dev_data->devid); 2017 clone_aliases(dev_data->pdev); 2018 2019 /* Flush the DTE entry */ 2020 device_flush_dte(dev_data); 2021 2022 /* Flush IOTLB */ 2023 domain_flush_tlb_pde(domain); 2024 2025 /* Wait for the flushes to finish */ 2026 domain_flush_complete(domain); 2027 2028 /* decrease reference counters - needs to happen after the flushes */ 2029 domain->dev_iommu[iommu->index] -= 1; 2030 domain->dev_cnt -= 1; 2031 } 2032 2033 static void pdev_iommuv2_disable(struct pci_dev *pdev) 2034 { 2035 pci_disable_ats(pdev); 2036 pci_disable_pri(pdev); 2037 pci_disable_pasid(pdev); 2038 } 2039 2040 /* FIXME: Change generic reset-function to do the same */ 2041 static int pri_reset_while_enabled(struct pci_dev *pdev) 2042 { 2043 u16 control; 2044 int pos; 2045 2046 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); 2047 if (!pos) 2048 return -EINVAL; 2049 2050 pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control); 2051 control |= PCI_PRI_CTRL_RESET; 2052 pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); 2053 2054 return 0; 2055 } 2056 2057 static int pdev_iommuv2_enable(struct pci_dev *pdev) 2058 { 2059 bool reset_enable; 2060 int reqs, ret; 2061 2062 /* FIXME: Hardcode number of outstanding requests for now */ 2063 reqs = 32; 2064 if (pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE)) 2065 reqs = 1; 2066 reset_enable = pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_ENABLE_RESET); 2067 2068 /* Only allow access to user-accessible pages */ 2069 ret = pci_enable_pasid(pdev, 0); 2070 if (ret) 2071 goto out_err; 2072 2073 /* First reset the PRI state of the device */ 2074 ret = pci_reset_pri(pdev); 2075 if (ret) 2076 goto out_err; 2077 2078 /* Enable PRI */ 2079 ret = pci_enable_pri(pdev, reqs); 2080 if (ret) 2081 goto out_err; 2082 2083 if (reset_enable) { 2084 ret = pri_reset_while_enabled(pdev); 2085 if (ret) 2086 goto out_err; 2087 } 2088 2089 ret = pci_enable_ats(pdev, PAGE_SHIFT); 2090 if (ret) 2091 goto out_err; 2092 2093 return 0; 2094 2095 out_err: 2096 pci_disable_pri(pdev); 2097 pci_disable_pasid(pdev); 2098 2099 return ret; 2100 } 2101 2102 /* 2103 * If a device is not yet associated with a domain, this function makes the 2104 * device visible in the domain 2105 */ 2106 static int attach_device(struct device *dev, 2107 struct protection_domain *domain) 2108 { 2109 struct iommu_dev_data *dev_data; 2110 struct pci_dev *pdev; 2111 unsigned long flags; 2112 int ret; 2113 2114 spin_lock_irqsave(&domain->lock, flags); 2115 2116 dev_data = dev_iommu_priv_get(dev); 2117 2118 spin_lock(&dev_data->lock); 2119 2120 ret = -EBUSY; 2121 if (dev_data->domain != NULL) 2122 goto out; 2123 2124 if (!dev_is_pci(dev)) 2125 goto skip_ats_check; 2126 2127 pdev = to_pci_dev(dev); 2128 if (domain->flags & PD_IOMMUV2_MASK) { 2129 struct iommu_domain *def_domain = iommu_get_dma_domain(dev); 2130 2131 ret = -EINVAL; 2132 if (def_domain->type != IOMMU_DOMAIN_IDENTITY) 2133 goto out; 2134 2135 if (dev_data->iommu_v2) { 2136 if (pdev_iommuv2_enable(pdev) != 0) 2137 goto out; 2138 2139 dev_data->ats.enabled = true; 2140 dev_data->ats.qdep = pci_ats_queue_depth(pdev); 2141 dev_data->pri_tlp = pci_prg_resp_pasid_required(pdev); 2142 } 2143 } else if (amd_iommu_iotlb_sup && 2144 pci_enable_ats(pdev, PAGE_SHIFT) == 0) { 2145 dev_data->ats.enabled = true; 2146 dev_data->ats.qdep = pci_ats_queue_depth(pdev); 2147 } 2148 2149 skip_ats_check: 2150 ret = 0; 2151 2152 do_attach(dev_data, domain); 2153 2154 /* 2155 * We might boot into a crash-kernel here. The crashed kernel 2156 * left the caches in the IOMMU dirty. So we have to flush 2157 * here to evict all dirty stuff. 2158 */ 2159 domain_flush_tlb_pde(domain); 2160 2161 domain_flush_complete(domain); 2162 2163 out: 2164 spin_unlock(&dev_data->lock); 2165 2166 spin_unlock_irqrestore(&domain->lock, flags); 2167 2168 return ret; 2169 } 2170 2171 /* 2172 * Removes a device from a protection domain (with devtable_lock held) 2173 */ 2174 static void detach_device(struct device *dev) 2175 { 2176 struct protection_domain *domain; 2177 struct iommu_dev_data *dev_data; 2178 unsigned long flags; 2179 2180 dev_data = dev_iommu_priv_get(dev); 2181 domain = dev_data->domain; 2182 2183 spin_lock_irqsave(&domain->lock, flags); 2184 2185 spin_lock(&dev_data->lock); 2186 2187 /* 2188 * First check if the device is still attached. It might already 2189 * be detached from its domain because the generic 2190 * iommu_detach_group code detached it and we try again here in 2191 * our alias handling. 2192 */ 2193 if (WARN_ON(!dev_data->domain)) 2194 goto out; 2195 2196 do_detach(dev_data); 2197 2198 if (!dev_is_pci(dev)) 2199 goto out; 2200 2201 if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2) 2202 pdev_iommuv2_disable(to_pci_dev(dev)); 2203 else if (dev_data->ats.enabled) 2204 pci_disable_ats(to_pci_dev(dev)); 2205 2206 dev_data->ats.enabled = false; 2207 2208 out: 2209 spin_unlock(&dev_data->lock); 2210 2211 spin_unlock_irqrestore(&domain->lock, flags); 2212 } 2213 2214 static struct iommu_device *amd_iommu_probe_device(struct device *dev) 2215 { 2216 struct iommu_device *iommu_dev; 2217 struct amd_iommu *iommu; 2218 int ret, devid; 2219 2220 if (!check_device(dev)) 2221 return ERR_PTR(-ENODEV); 2222 2223 devid = get_device_id(dev); 2224 if (devid < 0) 2225 return ERR_PTR(devid); 2226 2227 iommu = amd_iommu_rlookup_table[devid]; 2228 2229 if (dev_iommu_priv_get(dev)) 2230 return &iommu->iommu; 2231 2232 ret = iommu_init_device(dev); 2233 if (ret) { 2234 if (ret != -ENOTSUPP) 2235 dev_err(dev, "Failed to initialize - trying to proceed anyway\n"); 2236 iommu_dev = ERR_PTR(ret); 2237 iommu_ignore_device(dev); 2238 } else { 2239 amd_iommu_set_pci_msi_domain(dev, iommu); 2240 iommu_dev = &iommu->iommu; 2241 } 2242 2243 iommu_completion_wait(iommu); 2244 2245 return iommu_dev; 2246 } 2247 2248 static void amd_iommu_probe_finalize(struct device *dev) 2249 { 2250 struct iommu_domain *domain; 2251 2252 /* Domains are initialized for this device - have a look what we ended up with */ 2253 domain = iommu_get_domain_for_dev(dev); 2254 if (domain->type == IOMMU_DOMAIN_DMA) 2255 iommu_setup_dma_ops(dev, IOVA_START_PFN << PAGE_SHIFT, 0); 2256 } 2257 2258 static void amd_iommu_release_device(struct device *dev) 2259 { 2260 int devid = get_device_id(dev); 2261 struct amd_iommu *iommu; 2262 2263 if (!check_device(dev)) 2264 return; 2265 2266 iommu = amd_iommu_rlookup_table[devid]; 2267 2268 amd_iommu_uninit_device(dev); 2269 iommu_completion_wait(iommu); 2270 } 2271 2272 static struct iommu_group *amd_iommu_device_group(struct device *dev) 2273 { 2274 if (dev_is_pci(dev)) 2275 return pci_device_group(dev); 2276 2277 return acpihid_device_group(dev); 2278 } 2279 2280 static int amd_iommu_domain_get_attr(struct iommu_domain *domain, 2281 enum iommu_attr attr, void *data) 2282 { 2283 switch (domain->type) { 2284 case IOMMU_DOMAIN_UNMANAGED: 2285 return -ENODEV; 2286 case IOMMU_DOMAIN_DMA: 2287 switch (attr) { 2288 case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE: 2289 *(int *)data = !amd_iommu_unmap_flush; 2290 return 0; 2291 default: 2292 return -ENODEV; 2293 } 2294 break; 2295 default: 2296 return -EINVAL; 2297 } 2298 } 2299 2300 /***************************************************************************** 2301 * 2302 * The next functions belong to the dma_ops mapping/unmapping code. 2303 * 2304 *****************************************************************************/ 2305 2306 static void update_device_table(struct protection_domain *domain, 2307 struct domain_pgtable *pgtable) 2308 { 2309 struct iommu_dev_data *dev_data; 2310 2311 list_for_each_entry(dev_data, &domain->dev_list, list) { 2312 set_dte_entry(dev_data->devid, domain, pgtable, 2313 dev_data->ats.enabled, dev_data->iommu_v2); 2314 clone_aliases(dev_data->pdev); 2315 } 2316 } 2317 2318 static void update_and_flush_device_table(struct protection_domain *domain, 2319 struct domain_pgtable *pgtable) 2320 { 2321 update_device_table(domain, pgtable); 2322 domain_flush_devices(domain); 2323 } 2324 2325 static void update_domain(struct protection_domain *domain) 2326 { 2327 struct domain_pgtable pgtable; 2328 2329 /* Update device table */ 2330 amd_iommu_domain_get_pgtable(domain, &pgtable); 2331 update_and_flush_device_table(domain, &pgtable); 2332 2333 /* Flush domain TLB(s) and wait for completion */ 2334 domain_flush_tlb_pde(domain); 2335 domain_flush_complete(domain); 2336 } 2337 2338 int __init amd_iommu_init_api(void) 2339 { 2340 int ret, err = 0; 2341 2342 ret = iova_cache_get(); 2343 if (ret) 2344 return ret; 2345 2346 err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops); 2347 if (err) 2348 return err; 2349 #ifdef CONFIG_ARM_AMBA 2350 err = bus_set_iommu(&amba_bustype, &amd_iommu_ops); 2351 if (err) 2352 return err; 2353 #endif 2354 err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops); 2355 if (err) 2356 return err; 2357 2358 return 0; 2359 } 2360 2361 int __init amd_iommu_init_dma_ops(void) 2362 { 2363 swiotlb = (iommu_default_passthrough() || sme_me_mask) ? 1 : 0; 2364 2365 if (amd_iommu_unmap_flush) 2366 pr_info("IO/TLB flush on unmap enabled\n"); 2367 else 2368 pr_info("Lazy IO/TLB flushing enabled\n"); 2369 2370 return 0; 2371 2372 } 2373 2374 /***************************************************************************** 2375 * 2376 * The following functions belong to the exported interface of AMD IOMMU 2377 * 2378 * This interface allows access to lower level functions of the IOMMU 2379 * like protection domain handling and assignement of devices to domains 2380 * which is not possible with the dma_ops interface. 2381 * 2382 *****************************************************************************/ 2383 2384 static void cleanup_domain(struct protection_domain *domain) 2385 { 2386 struct iommu_dev_data *entry; 2387 unsigned long flags; 2388 2389 spin_lock_irqsave(&domain->lock, flags); 2390 2391 while (!list_empty(&domain->dev_list)) { 2392 entry = list_first_entry(&domain->dev_list, 2393 struct iommu_dev_data, list); 2394 BUG_ON(!entry->domain); 2395 do_detach(entry); 2396 } 2397 2398 spin_unlock_irqrestore(&domain->lock, flags); 2399 } 2400 2401 static void protection_domain_free(struct protection_domain *domain) 2402 { 2403 struct domain_pgtable pgtable; 2404 2405 if (!domain) 2406 return; 2407 2408 if (domain->id) 2409 domain_id_free(domain->id); 2410 2411 amd_iommu_domain_get_pgtable(domain, &pgtable); 2412 amd_iommu_domain_clr_pt_root(domain); 2413 free_pagetable(&pgtable); 2414 2415 kfree(domain); 2416 } 2417 2418 static int protection_domain_init(struct protection_domain *domain, int mode) 2419 { 2420 u64 *pt_root = NULL; 2421 2422 BUG_ON(mode < PAGE_MODE_NONE || mode > PAGE_MODE_6_LEVEL); 2423 2424 spin_lock_init(&domain->lock); 2425 domain->id = domain_id_alloc(); 2426 if (!domain->id) 2427 return -ENOMEM; 2428 INIT_LIST_HEAD(&domain->dev_list); 2429 2430 if (mode != PAGE_MODE_NONE) { 2431 pt_root = (void *)get_zeroed_page(GFP_KERNEL); 2432 if (!pt_root) 2433 return -ENOMEM; 2434 } 2435 2436 amd_iommu_domain_set_pgtable(domain, pt_root, mode); 2437 2438 return 0; 2439 } 2440 2441 static struct protection_domain *protection_domain_alloc(int mode) 2442 { 2443 struct protection_domain *domain; 2444 2445 domain = kzalloc(sizeof(*domain), GFP_KERNEL); 2446 if (!domain) 2447 return NULL; 2448 2449 if (protection_domain_init(domain, mode)) 2450 goto out_err; 2451 2452 return domain; 2453 2454 out_err: 2455 kfree(domain); 2456 2457 return NULL; 2458 } 2459 2460 static struct iommu_domain *amd_iommu_domain_alloc(unsigned type) 2461 { 2462 struct protection_domain *domain; 2463 int mode = DEFAULT_PGTABLE_LEVEL; 2464 2465 if (type == IOMMU_DOMAIN_IDENTITY) 2466 mode = PAGE_MODE_NONE; 2467 2468 domain = protection_domain_alloc(mode); 2469 if (!domain) 2470 return NULL; 2471 2472 domain->domain.geometry.aperture_start = 0; 2473 domain->domain.geometry.aperture_end = ~0ULL; 2474 domain->domain.geometry.force_aperture = true; 2475 2476 if (type == IOMMU_DOMAIN_DMA && 2477 iommu_get_dma_cookie(&domain->domain) == -ENOMEM) 2478 goto free_domain; 2479 2480 return &domain->domain; 2481 2482 free_domain: 2483 protection_domain_free(domain); 2484 2485 return NULL; 2486 } 2487 2488 static void amd_iommu_domain_free(struct iommu_domain *dom) 2489 { 2490 struct protection_domain *domain; 2491 2492 domain = to_pdomain(dom); 2493 2494 if (domain->dev_cnt > 0) 2495 cleanup_domain(domain); 2496 2497 BUG_ON(domain->dev_cnt != 0); 2498 2499 if (!dom) 2500 return; 2501 2502 if (dom->type == IOMMU_DOMAIN_DMA) 2503 iommu_put_dma_cookie(&domain->domain); 2504 2505 if (domain->flags & PD_IOMMUV2_MASK) 2506 free_gcr3_table(domain); 2507 2508 protection_domain_free(domain); 2509 } 2510 2511 static void amd_iommu_detach_device(struct iommu_domain *dom, 2512 struct device *dev) 2513 { 2514 struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev); 2515 struct amd_iommu *iommu; 2516 int devid; 2517 2518 if (!check_device(dev)) 2519 return; 2520 2521 devid = get_device_id(dev); 2522 if (devid < 0) 2523 return; 2524 2525 if (dev_data->domain != NULL) 2526 detach_device(dev); 2527 2528 iommu = amd_iommu_rlookup_table[devid]; 2529 if (!iommu) 2530 return; 2531 2532 #ifdef CONFIG_IRQ_REMAP 2533 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) && 2534 (dom->type == IOMMU_DOMAIN_UNMANAGED)) 2535 dev_data->use_vapic = 0; 2536 #endif 2537 2538 iommu_completion_wait(iommu); 2539 } 2540 2541 static int amd_iommu_attach_device(struct iommu_domain *dom, 2542 struct device *dev) 2543 { 2544 struct protection_domain *domain = to_pdomain(dom); 2545 struct iommu_dev_data *dev_data; 2546 struct amd_iommu *iommu; 2547 int ret; 2548 2549 if (!check_device(dev)) 2550 return -EINVAL; 2551 2552 dev_data = dev_iommu_priv_get(dev); 2553 dev_data->defer_attach = false; 2554 2555 iommu = amd_iommu_rlookup_table[dev_data->devid]; 2556 if (!iommu) 2557 return -EINVAL; 2558 2559 if (dev_data->domain) 2560 detach_device(dev); 2561 2562 ret = attach_device(dev, domain); 2563 2564 #ifdef CONFIG_IRQ_REMAP 2565 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) { 2566 if (dom->type == IOMMU_DOMAIN_UNMANAGED) 2567 dev_data->use_vapic = 1; 2568 else 2569 dev_data->use_vapic = 0; 2570 } 2571 #endif 2572 2573 iommu_completion_wait(iommu); 2574 2575 return ret; 2576 } 2577 2578 static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, 2579 phys_addr_t paddr, size_t page_size, int iommu_prot, 2580 gfp_t gfp) 2581 { 2582 struct protection_domain *domain = to_pdomain(dom); 2583 struct domain_pgtable pgtable; 2584 int prot = 0; 2585 int ret; 2586 2587 amd_iommu_domain_get_pgtable(domain, &pgtable); 2588 if (pgtable.mode == PAGE_MODE_NONE) 2589 return -EINVAL; 2590 2591 if (iommu_prot & IOMMU_READ) 2592 prot |= IOMMU_PROT_IR; 2593 if (iommu_prot & IOMMU_WRITE) 2594 prot |= IOMMU_PROT_IW; 2595 2596 ret = iommu_map_page(domain, iova, paddr, page_size, prot, gfp); 2597 2598 domain_flush_np_cache(domain, iova, page_size); 2599 2600 return ret; 2601 } 2602 2603 static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova, 2604 size_t page_size, 2605 struct iommu_iotlb_gather *gather) 2606 { 2607 struct protection_domain *domain = to_pdomain(dom); 2608 struct domain_pgtable pgtable; 2609 2610 amd_iommu_domain_get_pgtable(domain, &pgtable); 2611 if (pgtable.mode == PAGE_MODE_NONE) 2612 return 0; 2613 2614 return iommu_unmap_page(domain, iova, page_size); 2615 } 2616 2617 static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, 2618 dma_addr_t iova) 2619 { 2620 struct protection_domain *domain = to_pdomain(dom); 2621 unsigned long offset_mask, pte_pgsize; 2622 struct domain_pgtable pgtable; 2623 u64 *pte, __pte; 2624 2625 amd_iommu_domain_get_pgtable(domain, &pgtable); 2626 if (pgtable.mode == PAGE_MODE_NONE) 2627 return iova; 2628 2629 pte = fetch_pte(domain, iova, &pte_pgsize); 2630 2631 if (!pte || !IOMMU_PTE_PRESENT(*pte)) 2632 return 0; 2633 2634 offset_mask = pte_pgsize - 1; 2635 __pte = __sme_clr(*pte & PM_ADDR_MASK); 2636 2637 return (__pte & ~offset_mask) | (iova & offset_mask); 2638 } 2639 2640 static bool amd_iommu_capable(enum iommu_cap cap) 2641 { 2642 switch (cap) { 2643 case IOMMU_CAP_CACHE_COHERENCY: 2644 return true; 2645 case IOMMU_CAP_INTR_REMAP: 2646 return (irq_remapping_enabled == 1); 2647 case IOMMU_CAP_NOEXEC: 2648 return false; 2649 default: 2650 break; 2651 } 2652 2653 return false; 2654 } 2655 2656 static void amd_iommu_get_resv_regions(struct device *dev, 2657 struct list_head *head) 2658 { 2659 struct iommu_resv_region *region; 2660 struct unity_map_entry *entry; 2661 int devid; 2662 2663 devid = get_device_id(dev); 2664 if (devid < 0) 2665 return; 2666 2667 list_for_each_entry(entry, &amd_iommu_unity_map, list) { 2668 int type, prot = 0; 2669 size_t length; 2670 2671 if (devid < entry->devid_start || devid > entry->devid_end) 2672 continue; 2673 2674 type = IOMMU_RESV_DIRECT; 2675 length = entry->address_end - entry->address_start; 2676 if (entry->prot & IOMMU_PROT_IR) 2677 prot |= IOMMU_READ; 2678 if (entry->prot & IOMMU_PROT_IW) 2679 prot |= IOMMU_WRITE; 2680 if (entry->prot & IOMMU_UNITY_MAP_FLAG_EXCL_RANGE) 2681 /* Exclusion range */ 2682 type = IOMMU_RESV_RESERVED; 2683 2684 region = iommu_alloc_resv_region(entry->address_start, 2685 length, prot, type); 2686 if (!region) { 2687 dev_err(dev, "Out of memory allocating dm-regions\n"); 2688 return; 2689 } 2690 list_add_tail(®ion->list, head); 2691 } 2692 2693 region = iommu_alloc_resv_region(MSI_RANGE_START, 2694 MSI_RANGE_END - MSI_RANGE_START + 1, 2695 0, IOMMU_RESV_MSI); 2696 if (!region) 2697 return; 2698 list_add_tail(®ion->list, head); 2699 2700 region = iommu_alloc_resv_region(HT_RANGE_START, 2701 HT_RANGE_END - HT_RANGE_START + 1, 2702 0, IOMMU_RESV_RESERVED); 2703 if (!region) 2704 return; 2705 list_add_tail(®ion->list, head); 2706 } 2707 2708 bool amd_iommu_is_attach_deferred(struct iommu_domain *domain, 2709 struct device *dev) 2710 { 2711 struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev); 2712 2713 return dev_data->defer_attach; 2714 } 2715 EXPORT_SYMBOL_GPL(amd_iommu_is_attach_deferred); 2716 2717 static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain) 2718 { 2719 struct protection_domain *dom = to_pdomain(domain); 2720 unsigned long flags; 2721 2722 spin_lock_irqsave(&dom->lock, flags); 2723 domain_flush_tlb_pde(dom); 2724 domain_flush_complete(dom); 2725 spin_unlock_irqrestore(&dom->lock, flags); 2726 } 2727 2728 static void amd_iommu_iotlb_sync(struct iommu_domain *domain, 2729 struct iommu_iotlb_gather *gather) 2730 { 2731 amd_iommu_flush_iotlb_all(domain); 2732 } 2733 2734 static int amd_iommu_def_domain_type(struct device *dev) 2735 { 2736 struct iommu_dev_data *dev_data; 2737 2738 dev_data = dev_iommu_priv_get(dev); 2739 if (!dev_data) 2740 return 0; 2741 2742 /* 2743 * Do not identity map IOMMUv2 capable devices when memory encryption is 2744 * active, because some of those devices (AMD GPUs) don't have the 2745 * encryption bit in their DMA-mask and require remapping. 2746 */ 2747 if (!mem_encrypt_active() && dev_data->iommu_v2) 2748 return IOMMU_DOMAIN_IDENTITY; 2749 2750 return 0; 2751 } 2752 2753 const struct iommu_ops amd_iommu_ops = { 2754 .capable = amd_iommu_capable, 2755 .domain_alloc = amd_iommu_domain_alloc, 2756 .domain_free = amd_iommu_domain_free, 2757 .attach_dev = amd_iommu_attach_device, 2758 .detach_dev = amd_iommu_detach_device, 2759 .map = amd_iommu_map, 2760 .unmap = amd_iommu_unmap, 2761 .iova_to_phys = amd_iommu_iova_to_phys, 2762 .probe_device = amd_iommu_probe_device, 2763 .release_device = amd_iommu_release_device, 2764 .probe_finalize = amd_iommu_probe_finalize, 2765 .device_group = amd_iommu_device_group, 2766 .domain_get_attr = amd_iommu_domain_get_attr, 2767 .get_resv_regions = amd_iommu_get_resv_regions, 2768 .put_resv_regions = generic_iommu_put_resv_regions, 2769 .is_attach_deferred = amd_iommu_is_attach_deferred, 2770 .pgsize_bitmap = AMD_IOMMU_PGSIZES, 2771 .flush_iotlb_all = amd_iommu_flush_iotlb_all, 2772 .iotlb_sync = amd_iommu_iotlb_sync, 2773 .def_domain_type = amd_iommu_def_domain_type, 2774 }; 2775 2776 /***************************************************************************** 2777 * 2778 * The next functions do a basic initialization of IOMMU for pass through 2779 * mode 2780 * 2781 * In passthrough mode the IOMMU is initialized and enabled but not used for 2782 * DMA-API translation. 2783 * 2784 *****************************************************************************/ 2785 2786 /* IOMMUv2 specific functions */ 2787 int amd_iommu_register_ppr_notifier(struct notifier_block *nb) 2788 { 2789 return atomic_notifier_chain_register(&ppr_notifier, nb); 2790 } 2791 EXPORT_SYMBOL(amd_iommu_register_ppr_notifier); 2792 2793 int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb) 2794 { 2795 return atomic_notifier_chain_unregister(&ppr_notifier, nb); 2796 } 2797 EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier); 2798 2799 void amd_iommu_domain_direct_map(struct iommu_domain *dom) 2800 { 2801 struct protection_domain *domain = to_pdomain(dom); 2802 struct domain_pgtable pgtable; 2803 unsigned long flags; 2804 2805 spin_lock_irqsave(&domain->lock, flags); 2806 2807 /* First save pgtable configuration*/ 2808 amd_iommu_domain_get_pgtable(domain, &pgtable); 2809 2810 /* Remove page-table from domain */ 2811 amd_iommu_domain_clr_pt_root(domain); 2812 2813 /* Make changes visible to IOMMUs */ 2814 update_domain(domain); 2815 2816 /* Page-table is not visible to IOMMU anymore, so free it */ 2817 free_pagetable(&pgtable); 2818 2819 spin_unlock_irqrestore(&domain->lock, flags); 2820 } 2821 EXPORT_SYMBOL(amd_iommu_domain_direct_map); 2822 2823 int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids) 2824 { 2825 struct protection_domain *domain = to_pdomain(dom); 2826 unsigned long flags; 2827 int levels, ret; 2828 2829 if (pasids <= 0 || pasids > (PASID_MASK + 1)) 2830 return -EINVAL; 2831 2832 /* Number of GCR3 table levels required */ 2833 for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9) 2834 levels += 1; 2835 2836 if (levels > amd_iommu_max_glx_val) 2837 return -EINVAL; 2838 2839 spin_lock_irqsave(&domain->lock, flags); 2840 2841 /* 2842 * Save us all sanity checks whether devices already in the 2843 * domain support IOMMUv2. Just force that the domain has no 2844 * devices attached when it is switched into IOMMUv2 mode. 2845 */ 2846 ret = -EBUSY; 2847 if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK) 2848 goto out; 2849 2850 ret = -ENOMEM; 2851 domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC); 2852 if (domain->gcr3_tbl == NULL) 2853 goto out; 2854 2855 domain->glx = levels; 2856 domain->flags |= PD_IOMMUV2_MASK; 2857 2858 update_domain(domain); 2859 2860 ret = 0; 2861 2862 out: 2863 spin_unlock_irqrestore(&domain->lock, flags); 2864 2865 return ret; 2866 } 2867 EXPORT_SYMBOL(amd_iommu_domain_enable_v2); 2868 2869 static int __flush_pasid(struct protection_domain *domain, u32 pasid, 2870 u64 address, bool size) 2871 { 2872 struct iommu_dev_data *dev_data; 2873 struct iommu_cmd cmd; 2874 int i, ret; 2875 2876 if (!(domain->flags & PD_IOMMUV2_MASK)) 2877 return -EINVAL; 2878 2879 build_inv_iommu_pasid(&cmd, domain->id, pasid, address, size); 2880 2881 /* 2882 * IOMMU TLB needs to be flushed before Device TLB to 2883 * prevent device TLB refill from IOMMU TLB 2884 */ 2885 for (i = 0; i < amd_iommu_get_num_iommus(); ++i) { 2886 if (domain->dev_iommu[i] == 0) 2887 continue; 2888 2889 ret = iommu_queue_command(amd_iommus[i], &cmd); 2890 if (ret != 0) 2891 goto out; 2892 } 2893 2894 /* Wait until IOMMU TLB flushes are complete */ 2895 domain_flush_complete(domain); 2896 2897 /* Now flush device TLBs */ 2898 list_for_each_entry(dev_data, &domain->dev_list, list) { 2899 struct amd_iommu *iommu; 2900 int qdep; 2901 2902 /* 2903 There might be non-IOMMUv2 capable devices in an IOMMUv2 2904 * domain. 2905 */ 2906 if (!dev_data->ats.enabled) 2907 continue; 2908 2909 qdep = dev_data->ats.qdep; 2910 iommu = amd_iommu_rlookup_table[dev_data->devid]; 2911 2912 build_inv_iotlb_pasid(&cmd, dev_data->devid, pasid, 2913 qdep, address, size); 2914 2915 ret = iommu_queue_command(iommu, &cmd); 2916 if (ret != 0) 2917 goto out; 2918 } 2919 2920 /* Wait until all device TLBs are flushed */ 2921 domain_flush_complete(domain); 2922 2923 ret = 0; 2924 2925 out: 2926 2927 return ret; 2928 } 2929 2930 static int __amd_iommu_flush_page(struct protection_domain *domain, u32 pasid, 2931 u64 address) 2932 { 2933 return __flush_pasid(domain, pasid, address, false); 2934 } 2935 2936 int amd_iommu_flush_page(struct iommu_domain *dom, u32 pasid, 2937 u64 address) 2938 { 2939 struct protection_domain *domain = to_pdomain(dom); 2940 unsigned long flags; 2941 int ret; 2942 2943 spin_lock_irqsave(&domain->lock, flags); 2944 ret = __amd_iommu_flush_page(domain, pasid, address); 2945 spin_unlock_irqrestore(&domain->lock, flags); 2946 2947 return ret; 2948 } 2949 EXPORT_SYMBOL(amd_iommu_flush_page); 2950 2951 static int __amd_iommu_flush_tlb(struct protection_domain *domain, u32 pasid) 2952 { 2953 return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 2954 true); 2955 } 2956 2957 int amd_iommu_flush_tlb(struct iommu_domain *dom, u32 pasid) 2958 { 2959 struct protection_domain *domain = to_pdomain(dom); 2960 unsigned long flags; 2961 int ret; 2962 2963 spin_lock_irqsave(&domain->lock, flags); 2964 ret = __amd_iommu_flush_tlb(domain, pasid); 2965 spin_unlock_irqrestore(&domain->lock, flags); 2966 2967 return ret; 2968 } 2969 EXPORT_SYMBOL(amd_iommu_flush_tlb); 2970 2971 static u64 *__get_gcr3_pte(u64 *root, int level, u32 pasid, bool alloc) 2972 { 2973 int index; 2974 u64 *pte; 2975 2976 while (true) { 2977 2978 index = (pasid >> (9 * level)) & 0x1ff; 2979 pte = &root[index]; 2980 2981 if (level == 0) 2982 break; 2983 2984 if (!(*pte & GCR3_VALID)) { 2985 if (!alloc) 2986 return NULL; 2987 2988 root = (void *)get_zeroed_page(GFP_ATOMIC); 2989 if (root == NULL) 2990 return NULL; 2991 2992 *pte = iommu_virt_to_phys(root) | GCR3_VALID; 2993 } 2994 2995 root = iommu_phys_to_virt(*pte & PAGE_MASK); 2996 2997 level -= 1; 2998 } 2999 3000 return pte; 3001 } 3002 3003 static int __set_gcr3(struct protection_domain *domain, u32 pasid, 3004 unsigned long cr3) 3005 { 3006 struct domain_pgtable pgtable; 3007 u64 *pte; 3008 3009 amd_iommu_domain_get_pgtable(domain, &pgtable); 3010 if (pgtable.mode != PAGE_MODE_NONE) 3011 return -EINVAL; 3012 3013 pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true); 3014 if (pte == NULL) 3015 return -ENOMEM; 3016 3017 *pte = (cr3 & PAGE_MASK) | GCR3_VALID; 3018 3019 return __amd_iommu_flush_tlb(domain, pasid); 3020 } 3021 3022 static int __clear_gcr3(struct protection_domain *domain, u32 pasid) 3023 { 3024 struct domain_pgtable pgtable; 3025 u64 *pte; 3026 3027 amd_iommu_domain_get_pgtable(domain, &pgtable); 3028 if (pgtable.mode != PAGE_MODE_NONE) 3029 return -EINVAL; 3030 3031 pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false); 3032 if (pte == NULL) 3033 return 0; 3034 3035 *pte = 0; 3036 3037 return __amd_iommu_flush_tlb(domain, pasid); 3038 } 3039 3040 int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, u32 pasid, 3041 unsigned long cr3) 3042 { 3043 struct protection_domain *domain = to_pdomain(dom); 3044 unsigned long flags; 3045 int ret; 3046 3047 spin_lock_irqsave(&domain->lock, flags); 3048 ret = __set_gcr3(domain, pasid, cr3); 3049 spin_unlock_irqrestore(&domain->lock, flags); 3050 3051 return ret; 3052 } 3053 EXPORT_SYMBOL(amd_iommu_domain_set_gcr3); 3054 3055 int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, u32 pasid) 3056 { 3057 struct protection_domain *domain = to_pdomain(dom); 3058 unsigned long flags; 3059 int ret; 3060 3061 spin_lock_irqsave(&domain->lock, flags); 3062 ret = __clear_gcr3(domain, pasid); 3063 spin_unlock_irqrestore(&domain->lock, flags); 3064 3065 return ret; 3066 } 3067 EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3); 3068 3069 int amd_iommu_complete_ppr(struct pci_dev *pdev, u32 pasid, 3070 int status, int tag) 3071 { 3072 struct iommu_dev_data *dev_data; 3073 struct amd_iommu *iommu; 3074 struct iommu_cmd cmd; 3075 3076 dev_data = dev_iommu_priv_get(&pdev->dev); 3077 iommu = amd_iommu_rlookup_table[dev_data->devid]; 3078 3079 build_complete_ppr(&cmd, dev_data->devid, pasid, status, 3080 tag, dev_data->pri_tlp); 3081 3082 return iommu_queue_command(iommu, &cmd); 3083 } 3084 EXPORT_SYMBOL(amd_iommu_complete_ppr); 3085 3086 struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev) 3087 { 3088 struct protection_domain *pdomain; 3089 struct iommu_dev_data *dev_data; 3090 struct device *dev = &pdev->dev; 3091 struct iommu_domain *io_domain; 3092 3093 if (!check_device(dev)) 3094 return NULL; 3095 3096 dev_data = dev_iommu_priv_get(&pdev->dev); 3097 pdomain = dev_data->domain; 3098 io_domain = iommu_get_domain_for_dev(dev); 3099 3100 if (pdomain == NULL && dev_data->defer_attach) { 3101 dev_data->defer_attach = false; 3102 pdomain = to_pdomain(io_domain); 3103 attach_device(dev, pdomain); 3104 } 3105 3106 if (pdomain == NULL) 3107 return NULL; 3108 3109 if (io_domain->type != IOMMU_DOMAIN_DMA) 3110 return NULL; 3111 3112 /* Only return IOMMUv2 domains */ 3113 if (!(pdomain->flags & PD_IOMMUV2_MASK)) 3114 return NULL; 3115 3116 return &pdomain->domain; 3117 } 3118 EXPORT_SYMBOL(amd_iommu_get_v2_domain); 3119 3120 void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum) 3121 { 3122 struct iommu_dev_data *dev_data; 3123 3124 if (!amd_iommu_v2_supported()) 3125 return; 3126 3127 dev_data = dev_iommu_priv_get(&pdev->dev); 3128 dev_data->errata |= (1 << erratum); 3129 } 3130 EXPORT_SYMBOL(amd_iommu_enable_device_erratum); 3131 3132 int amd_iommu_device_info(struct pci_dev *pdev, 3133 struct amd_iommu_device_info *info) 3134 { 3135 int max_pasids; 3136 int pos; 3137 3138 if (pdev == NULL || info == NULL) 3139 return -EINVAL; 3140 3141 if (!amd_iommu_v2_supported()) 3142 return -EINVAL; 3143 3144 memset(info, 0, sizeof(*info)); 3145 3146 if (pci_ats_supported(pdev)) 3147 info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP; 3148 3149 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); 3150 if (pos) 3151 info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP; 3152 3153 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); 3154 if (pos) { 3155 int features; 3156 3157 max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1)); 3158 max_pasids = min(max_pasids, (1 << 20)); 3159 3160 info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP; 3161 info->max_pasids = min(pci_max_pasids(pdev), max_pasids); 3162 3163 features = pci_pasid_features(pdev); 3164 if (features & PCI_PASID_CAP_EXEC) 3165 info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP; 3166 if (features & PCI_PASID_CAP_PRIV) 3167 info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP; 3168 } 3169 3170 return 0; 3171 } 3172 EXPORT_SYMBOL(amd_iommu_device_info); 3173 3174 #ifdef CONFIG_IRQ_REMAP 3175 3176 /***************************************************************************** 3177 * 3178 * Interrupt Remapping Implementation 3179 * 3180 *****************************************************************************/ 3181 3182 static struct irq_chip amd_ir_chip; 3183 static DEFINE_SPINLOCK(iommu_table_lock); 3184 3185 static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table) 3186 { 3187 u64 dte; 3188 3189 dte = amd_iommu_dev_table[devid].data[2]; 3190 dte &= ~DTE_IRQ_PHYS_ADDR_MASK; 3191 dte |= iommu_virt_to_phys(table->table); 3192 dte |= DTE_IRQ_REMAP_INTCTL; 3193 dte |= DTE_INTTABLEN; 3194 dte |= DTE_IRQ_REMAP_ENABLE; 3195 3196 amd_iommu_dev_table[devid].data[2] = dte; 3197 } 3198 3199 static struct irq_remap_table *get_irq_table(u16 devid) 3200 { 3201 struct irq_remap_table *table; 3202 3203 if (WARN_ONCE(!amd_iommu_rlookup_table[devid], 3204 "%s: no iommu for devid %x\n", __func__, devid)) 3205 return NULL; 3206 3207 table = irq_lookup_table[devid]; 3208 if (WARN_ONCE(!table, "%s: no table for devid %x\n", __func__, devid)) 3209 return NULL; 3210 3211 return table; 3212 } 3213 3214 static struct irq_remap_table *__alloc_irq_table(void) 3215 { 3216 struct irq_remap_table *table; 3217 3218 table = kzalloc(sizeof(*table), GFP_KERNEL); 3219 if (!table) 3220 return NULL; 3221 3222 table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_KERNEL); 3223 if (!table->table) { 3224 kfree(table); 3225 return NULL; 3226 } 3227 raw_spin_lock_init(&table->lock); 3228 3229 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir)) 3230 memset(table->table, 0, 3231 MAX_IRQS_PER_TABLE * sizeof(u32)); 3232 else 3233 memset(table->table, 0, 3234 (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2))); 3235 return table; 3236 } 3237 3238 static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid, 3239 struct irq_remap_table *table) 3240 { 3241 irq_lookup_table[devid] = table; 3242 set_dte_irq_entry(devid, table); 3243 iommu_flush_dte(iommu, devid); 3244 } 3245 3246 static int set_remap_table_entry_alias(struct pci_dev *pdev, u16 alias, 3247 void *data) 3248 { 3249 struct irq_remap_table *table = data; 3250 3251 irq_lookup_table[alias] = table; 3252 set_dte_irq_entry(alias, table); 3253 3254 iommu_flush_dte(amd_iommu_rlookup_table[alias], alias); 3255 3256 return 0; 3257 } 3258 3259 static struct irq_remap_table *alloc_irq_table(u16 devid, struct pci_dev *pdev) 3260 { 3261 struct irq_remap_table *table = NULL; 3262 struct irq_remap_table *new_table = NULL; 3263 struct amd_iommu *iommu; 3264 unsigned long flags; 3265 u16 alias; 3266 3267 spin_lock_irqsave(&iommu_table_lock, flags); 3268 3269 iommu = amd_iommu_rlookup_table[devid]; 3270 if (!iommu) 3271 goto out_unlock; 3272 3273 table = irq_lookup_table[devid]; 3274 if (table) 3275 goto out_unlock; 3276 3277 alias = amd_iommu_alias_table[devid]; 3278 table = irq_lookup_table[alias]; 3279 if (table) { 3280 set_remap_table_entry(iommu, devid, table); 3281 goto out_wait; 3282 } 3283 spin_unlock_irqrestore(&iommu_table_lock, flags); 3284 3285 /* Nothing there yet, allocate new irq remapping table */ 3286 new_table = __alloc_irq_table(); 3287 if (!new_table) 3288 return NULL; 3289 3290 spin_lock_irqsave(&iommu_table_lock, flags); 3291 3292 table = irq_lookup_table[devid]; 3293 if (table) 3294 goto out_unlock; 3295 3296 table = irq_lookup_table[alias]; 3297 if (table) { 3298 set_remap_table_entry(iommu, devid, table); 3299 goto out_wait; 3300 } 3301 3302 table = new_table; 3303 new_table = NULL; 3304 3305 if (pdev) 3306 pci_for_each_dma_alias(pdev, set_remap_table_entry_alias, 3307 table); 3308 else 3309 set_remap_table_entry(iommu, devid, table); 3310 3311 if (devid != alias) 3312 set_remap_table_entry(iommu, alias, table); 3313 3314 out_wait: 3315 iommu_completion_wait(iommu); 3316 3317 out_unlock: 3318 spin_unlock_irqrestore(&iommu_table_lock, flags); 3319 3320 if (new_table) { 3321 kmem_cache_free(amd_iommu_irq_cache, new_table->table); 3322 kfree(new_table); 3323 } 3324 return table; 3325 } 3326 3327 static int alloc_irq_index(u16 devid, int count, bool align, 3328 struct pci_dev *pdev) 3329 { 3330 struct irq_remap_table *table; 3331 int index, c, alignment = 1; 3332 unsigned long flags; 3333 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; 3334 3335 if (!iommu) 3336 return -ENODEV; 3337 3338 table = alloc_irq_table(devid, pdev); 3339 if (!table) 3340 return -ENODEV; 3341 3342 if (align) 3343 alignment = roundup_pow_of_two(count); 3344 3345 raw_spin_lock_irqsave(&table->lock, flags); 3346 3347 /* Scan table for free entries */ 3348 for (index = ALIGN(table->min_index, alignment), c = 0; 3349 index < MAX_IRQS_PER_TABLE;) { 3350 if (!iommu->irte_ops->is_allocated(table, index)) { 3351 c += 1; 3352 } else { 3353 c = 0; 3354 index = ALIGN(index + 1, alignment); 3355 continue; 3356 } 3357 3358 if (c == count) { 3359 for (; c != 0; --c) 3360 iommu->irte_ops->set_allocated(table, index - c + 1); 3361 3362 index -= count - 1; 3363 goto out; 3364 } 3365 3366 index++; 3367 } 3368 3369 index = -ENOSPC; 3370 3371 out: 3372 raw_spin_unlock_irqrestore(&table->lock, flags); 3373 3374 return index; 3375 } 3376 3377 static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte, 3378 struct amd_ir_data *data) 3379 { 3380 bool ret; 3381 struct irq_remap_table *table; 3382 struct amd_iommu *iommu; 3383 unsigned long flags; 3384 struct irte_ga *entry; 3385 3386 iommu = amd_iommu_rlookup_table[devid]; 3387 if (iommu == NULL) 3388 return -EINVAL; 3389 3390 table = get_irq_table(devid); 3391 if (!table) 3392 return -ENOMEM; 3393 3394 raw_spin_lock_irqsave(&table->lock, flags); 3395 3396 entry = (struct irte_ga *)table->table; 3397 entry = &entry[index]; 3398 3399 ret = cmpxchg_double(&entry->lo.val, &entry->hi.val, 3400 entry->lo.val, entry->hi.val, 3401 irte->lo.val, irte->hi.val); 3402 /* 3403 * We use cmpxchg16 to atomically update the 128-bit IRTE, 3404 * and it cannot be updated by the hardware or other processors 3405 * behind us, so the return value of cmpxchg16 should be the 3406 * same as the old value. 3407 */ 3408 WARN_ON(!ret); 3409 3410 if (data) 3411 data->ref = entry; 3412 3413 raw_spin_unlock_irqrestore(&table->lock, flags); 3414 3415 iommu_flush_irt(iommu, devid); 3416 iommu_completion_wait(iommu); 3417 3418 return 0; 3419 } 3420 3421 static int modify_irte(u16 devid, int index, union irte *irte) 3422 { 3423 struct irq_remap_table *table; 3424 struct amd_iommu *iommu; 3425 unsigned long flags; 3426 3427 iommu = amd_iommu_rlookup_table[devid]; 3428 if (iommu == NULL) 3429 return -EINVAL; 3430 3431 table = get_irq_table(devid); 3432 if (!table) 3433 return -ENOMEM; 3434 3435 raw_spin_lock_irqsave(&table->lock, flags); 3436 table->table[index] = irte->val; 3437 raw_spin_unlock_irqrestore(&table->lock, flags); 3438 3439 iommu_flush_irt(iommu, devid); 3440 iommu_completion_wait(iommu); 3441 3442 return 0; 3443 } 3444 3445 static void free_irte(u16 devid, int index) 3446 { 3447 struct irq_remap_table *table; 3448 struct amd_iommu *iommu; 3449 unsigned long flags; 3450 3451 iommu = amd_iommu_rlookup_table[devid]; 3452 if (iommu == NULL) 3453 return; 3454 3455 table = get_irq_table(devid); 3456 if (!table) 3457 return; 3458 3459 raw_spin_lock_irqsave(&table->lock, flags); 3460 iommu->irte_ops->clear_allocated(table, index); 3461 raw_spin_unlock_irqrestore(&table->lock, flags); 3462 3463 iommu_flush_irt(iommu, devid); 3464 iommu_completion_wait(iommu); 3465 } 3466 3467 static void irte_prepare(void *entry, 3468 u32 delivery_mode, bool dest_mode, 3469 u8 vector, u32 dest_apicid, int devid) 3470 { 3471 union irte *irte = (union irte *) entry; 3472 3473 irte->val = 0; 3474 irte->fields.vector = vector; 3475 irte->fields.int_type = delivery_mode; 3476 irte->fields.destination = dest_apicid; 3477 irte->fields.dm = dest_mode; 3478 irte->fields.valid = 1; 3479 } 3480 3481 static void irte_ga_prepare(void *entry, 3482 u32 delivery_mode, bool dest_mode, 3483 u8 vector, u32 dest_apicid, int devid) 3484 { 3485 struct irte_ga *irte = (struct irte_ga *) entry; 3486 3487 irte->lo.val = 0; 3488 irte->hi.val = 0; 3489 irte->lo.fields_remap.int_type = delivery_mode; 3490 irte->lo.fields_remap.dm = dest_mode; 3491 irte->hi.fields.vector = vector; 3492 irte->lo.fields_remap.destination = APICID_TO_IRTE_DEST_LO(dest_apicid); 3493 irte->hi.fields.destination = APICID_TO_IRTE_DEST_HI(dest_apicid); 3494 irte->lo.fields_remap.valid = 1; 3495 } 3496 3497 static void irte_activate(void *entry, u16 devid, u16 index) 3498 { 3499 union irte *irte = (union irte *) entry; 3500 3501 irte->fields.valid = 1; 3502 modify_irte(devid, index, irte); 3503 } 3504 3505 static void irte_ga_activate(void *entry, u16 devid, u16 index) 3506 { 3507 struct irte_ga *irte = (struct irte_ga *) entry; 3508 3509 irte->lo.fields_remap.valid = 1; 3510 modify_irte_ga(devid, index, irte, NULL); 3511 } 3512 3513 static void irte_deactivate(void *entry, u16 devid, u16 index) 3514 { 3515 union irte *irte = (union irte *) entry; 3516 3517 irte->fields.valid = 0; 3518 modify_irte(devid, index, irte); 3519 } 3520 3521 static void irte_ga_deactivate(void *entry, u16 devid, u16 index) 3522 { 3523 struct irte_ga *irte = (struct irte_ga *) entry; 3524 3525 irte->lo.fields_remap.valid = 0; 3526 modify_irte_ga(devid, index, irte, NULL); 3527 } 3528 3529 static void irte_set_affinity(void *entry, u16 devid, u16 index, 3530 u8 vector, u32 dest_apicid) 3531 { 3532 union irte *irte = (union irte *) entry; 3533 3534 irte->fields.vector = vector; 3535 irte->fields.destination = dest_apicid; 3536 modify_irte(devid, index, irte); 3537 } 3538 3539 static void irte_ga_set_affinity(void *entry, u16 devid, u16 index, 3540 u8 vector, u32 dest_apicid) 3541 { 3542 struct irte_ga *irte = (struct irte_ga *) entry; 3543 3544 if (!irte->lo.fields_remap.guest_mode) { 3545 irte->hi.fields.vector = vector; 3546 irte->lo.fields_remap.destination = 3547 APICID_TO_IRTE_DEST_LO(dest_apicid); 3548 irte->hi.fields.destination = 3549 APICID_TO_IRTE_DEST_HI(dest_apicid); 3550 modify_irte_ga(devid, index, irte, NULL); 3551 } 3552 } 3553 3554 #define IRTE_ALLOCATED (~1U) 3555 static void irte_set_allocated(struct irq_remap_table *table, int index) 3556 { 3557 table->table[index] = IRTE_ALLOCATED; 3558 } 3559 3560 static void irte_ga_set_allocated(struct irq_remap_table *table, int index) 3561 { 3562 struct irte_ga *ptr = (struct irte_ga *)table->table; 3563 struct irte_ga *irte = &ptr[index]; 3564 3565 memset(&irte->lo.val, 0, sizeof(u64)); 3566 memset(&irte->hi.val, 0, sizeof(u64)); 3567 irte->hi.fields.vector = 0xff; 3568 } 3569 3570 static bool irte_is_allocated(struct irq_remap_table *table, int index) 3571 { 3572 union irte *ptr = (union irte *)table->table; 3573 union irte *irte = &ptr[index]; 3574 3575 return irte->val != 0; 3576 } 3577 3578 static bool irte_ga_is_allocated(struct irq_remap_table *table, int index) 3579 { 3580 struct irte_ga *ptr = (struct irte_ga *)table->table; 3581 struct irte_ga *irte = &ptr[index]; 3582 3583 return irte->hi.fields.vector != 0; 3584 } 3585 3586 static void irte_clear_allocated(struct irq_remap_table *table, int index) 3587 { 3588 table->table[index] = 0; 3589 } 3590 3591 static void irte_ga_clear_allocated(struct irq_remap_table *table, int index) 3592 { 3593 struct irte_ga *ptr = (struct irte_ga *)table->table; 3594 struct irte_ga *irte = &ptr[index]; 3595 3596 memset(&irte->lo.val, 0, sizeof(u64)); 3597 memset(&irte->hi.val, 0, sizeof(u64)); 3598 } 3599 3600 static int get_devid(struct irq_alloc_info *info) 3601 { 3602 switch (info->type) { 3603 case X86_IRQ_ALLOC_TYPE_IOAPIC: 3604 return get_ioapic_devid(info->devid); 3605 case X86_IRQ_ALLOC_TYPE_HPET: 3606 return get_hpet_devid(info->devid); 3607 case X86_IRQ_ALLOC_TYPE_PCI_MSI: 3608 case X86_IRQ_ALLOC_TYPE_PCI_MSIX: 3609 return get_device_id(msi_desc_to_dev(info->desc)); 3610 default: 3611 WARN_ON_ONCE(1); 3612 return -1; 3613 } 3614 } 3615 3616 struct irq_remap_ops amd_iommu_irq_ops = { 3617 .prepare = amd_iommu_prepare, 3618 .enable = amd_iommu_enable, 3619 .disable = amd_iommu_disable, 3620 .reenable = amd_iommu_reenable, 3621 .enable_faulting = amd_iommu_enable_faulting, 3622 }; 3623 3624 static void fill_msi_msg(struct msi_msg *msg, u32 index) 3625 { 3626 msg->data = index; 3627 msg->address_lo = 0; 3628 msg->arch_addr_lo.base_address = X86_MSI_BASE_ADDRESS_LOW; 3629 msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH; 3630 } 3631 3632 static void irq_remapping_prepare_irte(struct amd_ir_data *data, 3633 struct irq_cfg *irq_cfg, 3634 struct irq_alloc_info *info, 3635 int devid, int index, int sub_handle) 3636 { 3637 struct irq_2_irte *irte_info = &data->irq_2_irte; 3638 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; 3639 3640 if (!iommu) 3641 return; 3642 3643 data->irq_2_irte.devid = devid; 3644 data->irq_2_irte.index = index + sub_handle; 3645 iommu->irte_ops->prepare(data->entry, apic->delivery_mode, 3646 apic->dest_mode_logical, irq_cfg->vector, 3647 irq_cfg->dest_apicid, devid); 3648 3649 switch (info->type) { 3650 case X86_IRQ_ALLOC_TYPE_IOAPIC: 3651 case X86_IRQ_ALLOC_TYPE_HPET: 3652 case X86_IRQ_ALLOC_TYPE_PCI_MSI: 3653 case X86_IRQ_ALLOC_TYPE_PCI_MSIX: 3654 fill_msi_msg(&data->msi_entry, irte_info->index); 3655 break; 3656 3657 default: 3658 BUG_ON(1); 3659 break; 3660 } 3661 } 3662 3663 struct amd_irte_ops irte_32_ops = { 3664 .prepare = irte_prepare, 3665 .activate = irte_activate, 3666 .deactivate = irte_deactivate, 3667 .set_affinity = irte_set_affinity, 3668 .set_allocated = irte_set_allocated, 3669 .is_allocated = irte_is_allocated, 3670 .clear_allocated = irte_clear_allocated, 3671 }; 3672 3673 struct amd_irte_ops irte_128_ops = { 3674 .prepare = irte_ga_prepare, 3675 .activate = irte_ga_activate, 3676 .deactivate = irte_ga_deactivate, 3677 .set_affinity = irte_ga_set_affinity, 3678 .set_allocated = irte_ga_set_allocated, 3679 .is_allocated = irte_ga_is_allocated, 3680 .clear_allocated = irte_ga_clear_allocated, 3681 }; 3682 3683 static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq, 3684 unsigned int nr_irqs, void *arg) 3685 { 3686 struct irq_alloc_info *info = arg; 3687 struct irq_data *irq_data; 3688 struct amd_ir_data *data = NULL; 3689 struct irq_cfg *cfg; 3690 int i, ret, devid; 3691 int index; 3692 3693 if (!info) 3694 return -EINVAL; 3695 if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_PCI_MSI && 3696 info->type != X86_IRQ_ALLOC_TYPE_PCI_MSIX) 3697 return -EINVAL; 3698 3699 /* 3700 * With IRQ remapping enabled, don't need contiguous CPU vectors 3701 * to support multiple MSI interrupts. 3702 */ 3703 if (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI) 3704 info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS; 3705 3706 devid = get_devid(info); 3707 if (devid < 0) 3708 return -EINVAL; 3709 3710 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); 3711 if (ret < 0) 3712 return ret; 3713 3714 if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) { 3715 struct irq_remap_table *table; 3716 struct amd_iommu *iommu; 3717 3718 table = alloc_irq_table(devid, NULL); 3719 if (table) { 3720 if (!table->min_index) { 3721 /* 3722 * Keep the first 32 indexes free for IOAPIC 3723 * interrupts. 3724 */ 3725 table->min_index = 32; 3726 iommu = amd_iommu_rlookup_table[devid]; 3727 for (i = 0; i < 32; ++i) 3728 iommu->irte_ops->set_allocated(table, i); 3729 } 3730 WARN_ON(table->min_index != 32); 3731 index = info->ioapic.pin; 3732 } else { 3733 index = -ENOMEM; 3734 } 3735 } else if (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI || 3736 info->type == X86_IRQ_ALLOC_TYPE_PCI_MSIX) { 3737 bool align = (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI); 3738 3739 index = alloc_irq_index(devid, nr_irqs, align, 3740 msi_desc_to_pci_dev(info->desc)); 3741 } else { 3742 index = alloc_irq_index(devid, nr_irqs, false, NULL); 3743 } 3744 3745 if (index < 0) { 3746 pr_warn("Failed to allocate IRTE\n"); 3747 ret = index; 3748 goto out_free_parent; 3749 } 3750 3751 for (i = 0; i < nr_irqs; i++) { 3752 irq_data = irq_domain_get_irq_data(domain, virq + i); 3753 cfg = irq_data ? irqd_cfg(irq_data) : NULL; 3754 if (!cfg) { 3755 ret = -EINVAL; 3756 goto out_free_data; 3757 } 3758 3759 ret = -ENOMEM; 3760 data = kzalloc(sizeof(*data), GFP_KERNEL); 3761 if (!data) 3762 goto out_free_data; 3763 3764 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir)) 3765 data->entry = kzalloc(sizeof(union irte), GFP_KERNEL); 3766 else 3767 data->entry = kzalloc(sizeof(struct irte_ga), 3768 GFP_KERNEL); 3769 if (!data->entry) { 3770 kfree(data); 3771 goto out_free_data; 3772 } 3773 3774 irq_data->hwirq = (devid << 16) + i; 3775 irq_data->chip_data = data; 3776 irq_data->chip = &amd_ir_chip; 3777 irq_remapping_prepare_irte(data, cfg, info, devid, index, i); 3778 irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT); 3779 } 3780 3781 return 0; 3782 3783 out_free_data: 3784 for (i--; i >= 0; i--) { 3785 irq_data = irq_domain_get_irq_data(domain, virq + i); 3786 if (irq_data) 3787 kfree(irq_data->chip_data); 3788 } 3789 for (i = 0; i < nr_irqs; i++) 3790 free_irte(devid, index + i); 3791 out_free_parent: 3792 irq_domain_free_irqs_common(domain, virq, nr_irqs); 3793 return ret; 3794 } 3795 3796 static void irq_remapping_free(struct irq_domain *domain, unsigned int virq, 3797 unsigned int nr_irqs) 3798 { 3799 struct irq_2_irte *irte_info; 3800 struct irq_data *irq_data; 3801 struct amd_ir_data *data; 3802 int i; 3803 3804 for (i = 0; i < nr_irqs; i++) { 3805 irq_data = irq_domain_get_irq_data(domain, virq + i); 3806 if (irq_data && irq_data->chip_data) { 3807 data = irq_data->chip_data; 3808 irte_info = &data->irq_2_irte; 3809 free_irte(irte_info->devid, irte_info->index); 3810 kfree(data->entry); 3811 kfree(data); 3812 } 3813 } 3814 irq_domain_free_irqs_common(domain, virq, nr_irqs); 3815 } 3816 3817 static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu, 3818 struct amd_ir_data *ir_data, 3819 struct irq_2_irte *irte_info, 3820 struct irq_cfg *cfg); 3821 3822 static int irq_remapping_activate(struct irq_domain *domain, 3823 struct irq_data *irq_data, bool reserve) 3824 { 3825 struct amd_ir_data *data = irq_data->chip_data; 3826 struct irq_2_irte *irte_info = &data->irq_2_irte; 3827 struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid]; 3828 struct irq_cfg *cfg = irqd_cfg(irq_data); 3829 3830 if (!iommu) 3831 return 0; 3832 3833 iommu->irte_ops->activate(data->entry, irte_info->devid, 3834 irte_info->index); 3835 amd_ir_update_irte(irq_data, iommu, data, irte_info, cfg); 3836 return 0; 3837 } 3838 3839 static void irq_remapping_deactivate(struct irq_domain *domain, 3840 struct irq_data *irq_data) 3841 { 3842 struct amd_ir_data *data = irq_data->chip_data; 3843 struct irq_2_irte *irte_info = &data->irq_2_irte; 3844 struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid]; 3845 3846 if (iommu) 3847 iommu->irte_ops->deactivate(data->entry, irte_info->devid, 3848 irte_info->index); 3849 } 3850 3851 static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec, 3852 enum irq_domain_bus_token bus_token) 3853 { 3854 struct amd_iommu *iommu; 3855 int devid = -1; 3856 3857 if (!amd_iommu_irq_remap) 3858 return 0; 3859 3860 if (x86_fwspec_is_ioapic(fwspec)) 3861 devid = get_ioapic_devid(fwspec->param[0]); 3862 else if (x86_fwspec_is_hpet(fwspec)) 3863 devid = get_hpet_devid(fwspec->param[0]); 3864 3865 if (devid < 0) 3866 return 0; 3867 3868 iommu = amd_iommu_rlookup_table[devid]; 3869 return iommu && iommu->ir_domain == d; 3870 } 3871 3872 static const struct irq_domain_ops amd_ir_domain_ops = { 3873 .select = irq_remapping_select, 3874 .alloc = irq_remapping_alloc, 3875 .free = irq_remapping_free, 3876 .activate = irq_remapping_activate, 3877 .deactivate = irq_remapping_deactivate, 3878 }; 3879 3880 int amd_iommu_activate_guest_mode(void *data) 3881 { 3882 struct amd_ir_data *ir_data = (struct amd_ir_data *)data; 3883 struct irte_ga *entry = (struct irte_ga *) ir_data->entry; 3884 u64 valid; 3885 3886 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) || 3887 !entry || entry->lo.fields_vapic.guest_mode) 3888 return 0; 3889 3890 valid = entry->lo.fields_vapic.valid; 3891 3892 entry->lo.val = 0; 3893 entry->hi.val = 0; 3894 3895 entry->lo.fields_vapic.valid = valid; 3896 entry->lo.fields_vapic.guest_mode = 1; 3897 entry->lo.fields_vapic.ga_log_intr = 1; 3898 entry->hi.fields.ga_root_ptr = ir_data->ga_root_ptr; 3899 entry->hi.fields.vector = ir_data->ga_vector; 3900 entry->lo.fields_vapic.ga_tag = ir_data->ga_tag; 3901 3902 return modify_irte_ga(ir_data->irq_2_irte.devid, 3903 ir_data->irq_2_irte.index, entry, ir_data); 3904 } 3905 EXPORT_SYMBOL(amd_iommu_activate_guest_mode); 3906 3907 int amd_iommu_deactivate_guest_mode(void *data) 3908 { 3909 struct amd_ir_data *ir_data = (struct amd_ir_data *)data; 3910 struct irte_ga *entry = (struct irte_ga *) ir_data->entry; 3911 struct irq_cfg *cfg = ir_data->cfg; 3912 u64 valid; 3913 3914 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) || 3915 !entry || !entry->lo.fields_vapic.guest_mode) 3916 return 0; 3917 3918 valid = entry->lo.fields_remap.valid; 3919 3920 entry->lo.val = 0; 3921 entry->hi.val = 0; 3922 3923 entry->lo.fields_remap.valid = valid; 3924 entry->lo.fields_remap.dm = apic->dest_mode_logical; 3925 entry->lo.fields_remap.int_type = apic->delivery_mode; 3926 entry->hi.fields.vector = cfg->vector; 3927 entry->lo.fields_remap.destination = 3928 APICID_TO_IRTE_DEST_LO(cfg->dest_apicid); 3929 entry->hi.fields.destination = 3930 APICID_TO_IRTE_DEST_HI(cfg->dest_apicid); 3931 3932 return modify_irte_ga(ir_data->irq_2_irte.devid, 3933 ir_data->irq_2_irte.index, entry, ir_data); 3934 } 3935 EXPORT_SYMBOL(amd_iommu_deactivate_guest_mode); 3936 3937 static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info) 3938 { 3939 int ret; 3940 struct amd_iommu *iommu; 3941 struct amd_iommu_pi_data *pi_data = vcpu_info; 3942 struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data; 3943 struct amd_ir_data *ir_data = data->chip_data; 3944 struct irq_2_irte *irte_info = &ir_data->irq_2_irte; 3945 struct iommu_dev_data *dev_data = search_dev_data(irte_info->devid); 3946 3947 /* Note: 3948 * This device has never been set up for guest mode. 3949 * we should not modify the IRTE 3950 */ 3951 if (!dev_data || !dev_data->use_vapic) 3952 return 0; 3953 3954 ir_data->cfg = irqd_cfg(data); 3955 pi_data->ir_data = ir_data; 3956 3957 /* Note: 3958 * SVM tries to set up for VAPIC mode, but we are in 3959 * legacy mode. So, we force legacy mode instead. 3960 */ 3961 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) { 3962 pr_debug("%s: Fall back to using intr legacy remap\n", 3963 __func__); 3964 pi_data->is_guest_mode = false; 3965 } 3966 3967 iommu = amd_iommu_rlookup_table[irte_info->devid]; 3968 if (iommu == NULL) 3969 return -EINVAL; 3970 3971 pi_data->prev_ga_tag = ir_data->cached_ga_tag; 3972 if (pi_data->is_guest_mode) { 3973 ir_data->ga_root_ptr = (pi_data->base >> 12); 3974 ir_data->ga_vector = vcpu_pi_info->vector; 3975 ir_data->ga_tag = pi_data->ga_tag; 3976 ret = amd_iommu_activate_guest_mode(ir_data); 3977 if (!ret) 3978 ir_data->cached_ga_tag = pi_data->ga_tag; 3979 } else { 3980 ret = amd_iommu_deactivate_guest_mode(ir_data); 3981 3982 /* 3983 * This communicates the ga_tag back to the caller 3984 * so that it can do all the necessary clean up. 3985 */ 3986 if (!ret) 3987 ir_data->cached_ga_tag = 0; 3988 } 3989 3990 return ret; 3991 } 3992 3993 3994 static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu, 3995 struct amd_ir_data *ir_data, 3996 struct irq_2_irte *irte_info, 3997 struct irq_cfg *cfg) 3998 { 3999 4000 /* 4001 * Atomically updates the IRTE with the new destination, vector 4002 * and flushes the interrupt entry cache. 4003 */ 4004 iommu->irte_ops->set_affinity(ir_data->entry, irte_info->devid, 4005 irte_info->index, cfg->vector, 4006 cfg->dest_apicid); 4007 } 4008 4009 static int amd_ir_set_affinity(struct irq_data *data, 4010 const struct cpumask *mask, bool force) 4011 { 4012 struct amd_ir_data *ir_data = data->chip_data; 4013 struct irq_2_irte *irte_info = &ir_data->irq_2_irte; 4014 struct irq_cfg *cfg = irqd_cfg(data); 4015 struct irq_data *parent = data->parent_data; 4016 struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid]; 4017 int ret; 4018 4019 if (!iommu) 4020 return -ENODEV; 4021 4022 ret = parent->chip->irq_set_affinity(parent, mask, force); 4023 if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE) 4024 return ret; 4025 4026 amd_ir_update_irte(data, iommu, ir_data, irte_info, cfg); 4027 /* 4028 * After this point, all the interrupts will start arriving 4029 * at the new destination. So, time to cleanup the previous 4030 * vector allocation. 4031 */ 4032 send_cleanup_vector(cfg); 4033 4034 return IRQ_SET_MASK_OK_DONE; 4035 } 4036 4037 static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg) 4038 { 4039 struct amd_ir_data *ir_data = irq_data->chip_data; 4040 4041 *msg = ir_data->msi_entry; 4042 } 4043 4044 static struct irq_chip amd_ir_chip = { 4045 .name = "AMD-IR", 4046 .irq_ack = apic_ack_irq, 4047 .irq_set_affinity = amd_ir_set_affinity, 4048 .irq_set_vcpu_affinity = amd_ir_set_vcpu_affinity, 4049 .irq_compose_msi_msg = ir_compose_msi_msg, 4050 }; 4051 4052 int amd_iommu_create_irq_domain(struct amd_iommu *iommu) 4053 { 4054 struct fwnode_handle *fn; 4055 4056 fn = irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index); 4057 if (!fn) 4058 return -ENOMEM; 4059 iommu->ir_domain = irq_domain_create_tree(fn, &amd_ir_domain_ops, iommu); 4060 if (!iommu->ir_domain) { 4061 irq_domain_free_fwnode(fn); 4062 return -ENOMEM; 4063 } 4064 4065 iommu->ir_domain->parent = arch_get_ir_parent_domain(); 4066 iommu->msi_domain = arch_create_remap_msi_irq_domain(iommu->ir_domain, 4067 "AMD-IR-MSI", 4068 iommu->index); 4069 return 0; 4070 } 4071 4072 int amd_iommu_update_ga(int cpu, bool is_run, void *data) 4073 { 4074 unsigned long flags; 4075 struct amd_iommu *iommu; 4076 struct irq_remap_table *table; 4077 struct amd_ir_data *ir_data = (struct amd_ir_data *)data; 4078 int devid = ir_data->irq_2_irte.devid; 4079 struct irte_ga *entry = (struct irte_ga *) ir_data->entry; 4080 struct irte_ga *ref = (struct irte_ga *) ir_data->ref; 4081 4082 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) || 4083 !ref || !entry || !entry->lo.fields_vapic.guest_mode) 4084 return 0; 4085 4086 iommu = amd_iommu_rlookup_table[devid]; 4087 if (!iommu) 4088 return -ENODEV; 4089 4090 table = get_irq_table(devid); 4091 if (!table) 4092 return -ENODEV; 4093 4094 raw_spin_lock_irqsave(&table->lock, flags); 4095 4096 if (ref->lo.fields_vapic.guest_mode) { 4097 if (cpu >= 0) { 4098 ref->lo.fields_vapic.destination = 4099 APICID_TO_IRTE_DEST_LO(cpu); 4100 ref->hi.fields.destination = 4101 APICID_TO_IRTE_DEST_HI(cpu); 4102 } 4103 ref->lo.fields_vapic.is_run = is_run; 4104 barrier(); 4105 } 4106 4107 raw_spin_unlock_irqrestore(&table->lock, flags); 4108 4109 iommu_flush_irt(iommu, devid); 4110 iommu_completion_wait(iommu); 4111 return 0; 4112 } 4113 EXPORT_SYMBOL(amd_iommu_update_ga); 4114 #endif 4115