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/pci.h> 12 #include <linux/acpi.h> 13 #include <linux/list.h> 14 #include <linux/bitmap.h> 15 #include <linux/slab.h> 16 #include <linux/syscore_ops.h> 17 #include <linux/interrupt.h> 18 #include <linux/msi.h> 19 #include <linux/irq.h> 20 #include <linux/amd-iommu.h> 21 #include <linux/export.h> 22 #include <linux/kmemleak.h> 23 #include <linux/cc_platform.h> 24 #include <linux/iopoll.h> 25 #include <asm/pci-direct.h> 26 #include <asm/iommu.h> 27 #include <asm/apic.h> 28 #include <asm/gart.h> 29 #include <asm/x86_init.h> 30 #include <asm/io_apic.h> 31 #include <asm/irq_remapping.h> 32 #include <asm/set_memory.h> 33 #include <asm/sev.h> 34 35 #include <linux/crash_dump.h> 36 37 #include "amd_iommu.h" 38 #include "../irq_remapping.h" 39 40 /* 41 * definitions for the ACPI scanning code 42 */ 43 #define IVRS_HEADER_LENGTH 48 44 45 #define ACPI_IVHD_TYPE_MAX_SUPPORTED 0x40 46 #define ACPI_IVMD_TYPE_ALL 0x20 47 #define ACPI_IVMD_TYPE 0x21 48 #define ACPI_IVMD_TYPE_RANGE 0x22 49 50 #define IVHD_DEV_ALL 0x01 51 #define IVHD_DEV_SELECT 0x02 52 #define IVHD_DEV_SELECT_RANGE_START 0x03 53 #define IVHD_DEV_RANGE_END 0x04 54 #define IVHD_DEV_ALIAS 0x42 55 #define IVHD_DEV_ALIAS_RANGE 0x43 56 #define IVHD_DEV_EXT_SELECT 0x46 57 #define IVHD_DEV_EXT_SELECT_RANGE 0x47 58 #define IVHD_DEV_SPECIAL 0x48 59 #define IVHD_DEV_ACPI_HID 0xf0 60 61 #define UID_NOT_PRESENT 0 62 #define UID_IS_INTEGER 1 63 #define UID_IS_CHARACTER 2 64 65 #define IVHD_SPECIAL_IOAPIC 1 66 #define IVHD_SPECIAL_HPET 2 67 68 #define IVHD_FLAG_HT_TUN_EN_MASK 0x01 69 #define IVHD_FLAG_PASSPW_EN_MASK 0x02 70 #define IVHD_FLAG_RESPASSPW_EN_MASK 0x04 71 #define IVHD_FLAG_ISOC_EN_MASK 0x08 72 73 #define IVMD_FLAG_EXCL_RANGE 0x08 74 #define IVMD_FLAG_IW 0x04 75 #define IVMD_FLAG_IR 0x02 76 #define IVMD_FLAG_UNITY_MAP 0x01 77 78 #define ACPI_DEVFLAG_INITPASS 0x01 79 #define ACPI_DEVFLAG_EXTINT 0x02 80 #define ACPI_DEVFLAG_NMI 0x04 81 #define ACPI_DEVFLAG_SYSMGT1 0x10 82 #define ACPI_DEVFLAG_SYSMGT2 0x20 83 #define ACPI_DEVFLAG_LINT0 0x40 84 #define ACPI_DEVFLAG_LINT1 0x80 85 #define ACPI_DEVFLAG_ATSDIS 0x10000000 86 87 #define IVRS_GET_SBDF_ID(seg, bus, dev, fn) (((seg & 0xffff) << 16) | ((bus & 0xff) << 8) \ 88 | ((dev & 0x1f) << 3) | (fn & 0x7)) 89 90 /* 91 * ACPI table definitions 92 * 93 * These data structures are laid over the table to parse the important values 94 * out of it. 95 */ 96 97 /* 98 * structure describing one IOMMU in the ACPI table. Typically followed by one 99 * or more ivhd_entrys. 100 */ 101 struct ivhd_header { 102 u8 type; 103 u8 flags; 104 u16 length; 105 u16 devid; 106 u16 cap_ptr; 107 u64 mmio_phys; 108 u16 pci_seg; 109 u16 info; 110 u32 efr_attr; 111 112 /* Following only valid on IVHD type 11h and 40h */ 113 u64 efr_reg; /* Exact copy of MMIO_EXT_FEATURES */ 114 u64 efr_reg2; 115 } __attribute__((packed)); 116 117 /* 118 * A device entry describing which devices a specific IOMMU translates and 119 * which requestor ids they use. 120 */ 121 struct ivhd_entry { 122 u8 type; 123 u16 devid; 124 u8 flags; 125 struct_group(ext_hid, 126 u32 ext; 127 u32 hidh; 128 ); 129 u64 cid; 130 u8 uidf; 131 u8 uidl; 132 u8 uid; 133 } __attribute__((packed)); 134 135 /* 136 * An AMD IOMMU memory definition structure. It defines things like exclusion 137 * ranges for devices and regions that should be unity mapped. 138 */ 139 struct ivmd_header { 140 u8 type; 141 u8 flags; 142 u16 length; 143 u16 devid; 144 u16 aux; 145 u16 pci_seg; 146 u8 resv[6]; 147 u64 range_start; 148 u64 range_length; 149 } __attribute__((packed)); 150 151 bool amd_iommu_dump; 152 bool amd_iommu_irq_remap __read_mostly; 153 154 enum io_pgtable_fmt amd_iommu_pgtable = AMD_IOMMU_V1; 155 /* Guest page table level */ 156 int amd_iommu_gpt_level = PAGE_MODE_4_LEVEL; 157 158 int amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC; 159 static int amd_iommu_xt_mode = IRQ_REMAP_XAPIC_MODE; 160 161 static bool amd_iommu_detected; 162 static bool amd_iommu_disabled __initdata; 163 static bool amd_iommu_force_enable __initdata; 164 static bool amd_iommu_irtcachedis; 165 static int amd_iommu_target_ivhd_type; 166 167 /* Global EFR and EFR2 registers */ 168 u64 amd_iommu_efr; 169 u64 amd_iommu_efr2; 170 171 /* SNP is enabled on the system? */ 172 bool amd_iommu_snp_en; 173 EXPORT_SYMBOL(amd_iommu_snp_en); 174 175 LIST_HEAD(amd_iommu_pci_seg_list); /* list of all PCI segments */ 176 LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the 177 system */ 178 179 /* Array to assign indices to IOMMUs*/ 180 struct amd_iommu *amd_iommus[MAX_IOMMUS]; 181 182 /* Number of IOMMUs present in the system */ 183 static int amd_iommus_present; 184 185 /* IOMMUs have a non-present cache? */ 186 bool amd_iommu_np_cache __read_mostly; 187 bool amd_iommu_iotlb_sup __read_mostly = true; 188 189 static bool amd_iommu_pc_present __read_mostly; 190 bool amdr_ivrs_remap_support __read_mostly; 191 192 bool amd_iommu_force_isolation __read_mostly; 193 194 /* 195 * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap 196 * to know which ones are already in use. 197 */ 198 unsigned long *amd_iommu_pd_alloc_bitmap; 199 200 enum iommu_init_state { 201 IOMMU_START_STATE, 202 IOMMU_IVRS_DETECTED, 203 IOMMU_ACPI_FINISHED, 204 IOMMU_ENABLED, 205 IOMMU_PCI_INIT, 206 IOMMU_INTERRUPTS_EN, 207 IOMMU_INITIALIZED, 208 IOMMU_NOT_FOUND, 209 IOMMU_INIT_ERROR, 210 IOMMU_CMDLINE_DISABLED, 211 }; 212 213 /* Early ioapic and hpet maps from kernel command line */ 214 #define EARLY_MAP_SIZE 4 215 static struct devid_map __initdata early_ioapic_map[EARLY_MAP_SIZE]; 216 static struct devid_map __initdata early_hpet_map[EARLY_MAP_SIZE]; 217 static struct acpihid_map_entry __initdata early_acpihid_map[EARLY_MAP_SIZE]; 218 219 static int __initdata early_ioapic_map_size; 220 static int __initdata early_hpet_map_size; 221 static int __initdata early_acpihid_map_size; 222 223 static bool __initdata cmdline_maps; 224 225 static enum iommu_init_state init_state = IOMMU_START_STATE; 226 227 static int amd_iommu_enable_interrupts(void); 228 static int __init iommu_go_to_state(enum iommu_init_state state); 229 static void init_device_table_dma(struct amd_iommu_pci_seg *pci_seg); 230 231 static bool amd_iommu_pre_enabled = true; 232 233 static u32 amd_iommu_ivinfo __initdata; 234 235 bool translation_pre_enabled(struct amd_iommu *iommu) 236 { 237 return (iommu->flags & AMD_IOMMU_FLAG_TRANS_PRE_ENABLED); 238 } 239 240 static void clear_translation_pre_enabled(struct amd_iommu *iommu) 241 { 242 iommu->flags &= ~AMD_IOMMU_FLAG_TRANS_PRE_ENABLED; 243 } 244 245 static void init_translation_status(struct amd_iommu *iommu) 246 { 247 u64 ctrl; 248 249 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET); 250 if (ctrl & (1<<CONTROL_IOMMU_EN)) 251 iommu->flags |= AMD_IOMMU_FLAG_TRANS_PRE_ENABLED; 252 } 253 254 static inline unsigned long tbl_size(int entry_size, int last_bdf) 255 { 256 unsigned shift = PAGE_SHIFT + 257 get_order((last_bdf + 1) * entry_size); 258 259 return 1UL << shift; 260 } 261 262 int amd_iommu_get_num_iommus(void) 263 { 264 return amd_iommus_present; 265 } 266 267 /* 268 * Iterate through all the IOMMUs to get common EFR 269 * masks among all IOMMUs and warn if found inconsistency. 270 */ 271 static __init void get_global_efr(void) 272 { 273 struct amd_iommu *iommu; 274 275 for_each_iommu(iommu) { 276 u64 tmp = iommu->features; 277 u64 tmp2 = iommu->features2; 278 279 if (list_is_first(&iommu->list, &amd_iommu_list)) { 280 amd_iommu_efr = tmp; 281 amd_iommu_efr2 = tmp2; 282 continue; 283 } 284 285 if (amd_iommu_efr == tmp && 286 amd_iommu_efr2 == tmp2) 287 continue; 288 289 pr_err(FW_BUG 290 "Found inconsistent EFR/EFR2 %#llx,%#llx (global %#llx,%#llx) on iommu%d (%04x:%02x:%02x.%01x).\n", 291 tmp, tmp2, amd_iommu_efr, amd_iommu_efr2, 292 iommu->index, iommu->pci_seg->id, 293 PCI_BUS_NUM(iommu->devid), PCI_SLOT(iommu->devid), 294 PCI_FUNC(iommu->devid)); 295 296 amd_iommu_efr &= tmp; 297 amd_iommu_efr2 &= tmp2; 298 } 299 300 pr_info("Using global IVHD EFR:%#llx, EFR2:%#llx\n", amd_iommu_efr, amd_iommu_efr2); 301 } 302 303 /* 304 * For IVHD type 0x11/0x40, EFR is also available via IVHD. 305 * Default to IVHD EFR since it is available sooner 306 * (i.e. before PCI init). 307 */ 308 static void __init early_iommu_features_init(struct amd_iommu *iommu, 309 struct ivhd_header *h) 310 { 311 if (amd_iommu_ivinfo & IOMMU_IVINFO_EFRSUP) { 312 iommu->features = h->efr_reg; 313 iommu->features2 = h->efr_reg2; 314 } 315 if (amd_iommu_ivinfo & IOMMU_IVINFO_DMA_REMAP) 316 amdr_ivrs_remap_support = true; 317 } 318 319 /* Access to l1 and l2 indexed register spaces */ 320 321 static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address) 322 { 323 u32 val; 324 325 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16)); 326 pci_read_config_dword(iommu->dev, 0xfc, &val); 327 return val; 328 } 329 330 static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val) 331 { 332 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31)); 333 pci_write_config_dword(iommu->dev, 0xfc, val); 334 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16)); 335 } 336 337 static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address) 338 { 339 u32 val; 340 341 pci_write_config_dword(iommu->dev, 0xf0, address); 342 pci_read_config_dword(iommu->dev, 0xf4, &val); 343 return val; 344 } 345 346 static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val) 347 { 348 pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8)); 349 pci_write_config_dword(iommu->dev, 0xf4, val); 350 } 351 352 /**************************************************************************** 353 * 354 * AMD IOMMU MMIO register space handling functions 355 * 356 * These functions are used to program the IOMMU device registers in 357 * MMIO space required for that driver. 358 * 359 ****************************************************************************/ 360 361 /* 362 * This function set the exclusion range in the IOMMU. DMA accesses to the 363 * exclusion range are passed through untranslated 364 */ 365 static void iommu_set_exclusion_range(struct amd_iommu *iommu) 366 { 367 u64 start = iommu->exclusion_start & PAGE_MASK; 368 u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK; 369 u64 entry; 370 371 if (!iommu->exclusion_start) 372 return; 373 374 entry = start | MMIO_EXCL_ENABLE_MASK; 375 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET, 376 &entry, sizeof(entry)); 377 378 entry = limit; 379 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET, 380 &entry, sizeof(entry)); 381 } 382 383 static void iommu_set_cwwb_range(struct amd_iommu *iommu) 384 { 385 u64 start = iommu_virt_to_phys((void *)iommu->cmd_sem); 386 u64 entry = start & PM_ADDR_MASK; 387 388 if (!check_feature(FEATURE_SNP)) 389 return; 390 391 /* Note: 392 * Re-purpose Exclusion base/limit registers for Completion wait 393 * write-back base/limit. 394 */ 395 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET, 396 &entry, sizeof(entry)); 397 398 /* Note: 399 * Default to 4 Kbytes, which can be specified by setting base 400 * address equal to the limit address. 401 */ 402 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET, 403 &entry, sizeof(entry)); 404 } 405 406 /* Programs the physical address of the device table into the IOMMU hardware */ 407 static void iommu_set_device_table(struct amd_iommu *iommu) 408 { 409 u64 entry; 410 u32 dev_table_size = iommu->pci_seg->dev_table_size; 411 void *dev_table = (void *)get_dev_table(iommu); 412 413 BUG_ON(iommu->mmio_base == NULL); 414 415 entry = iommu_virt_to_phys(dev_table); 416 entry |= (dev_table_size >> 12) - 1; 417 memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET, 418 &entry, sizeof(entry)); 419 } 420 421 /* Generic functions to enable/disable certain features of the IOMMU. */ 422 static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit) 423 { 424 u64 ctrl; 425 426 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET); 427 ctrl |= (1ULL << bit); 428 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); 429 } 430 431 static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit) 432 { 433 u64 ctrl; 434 435 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET); 436 ctrl &= ~(1ULL << bit); 437 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); 438 } 439 440 static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout) 441 { 442 u64 ctrl; 443 444 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET); 445 ctrl &= ~CTRL_INV_TO_MASK; 446 ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK; 447 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); 448 } 449 450 /* Function to enable the hardware */ 451 static void iommu_enable(struct amd_iommu *iommu) 452 { 453 iommu_feature_enable(iommu, CONTROL_IOMMU_EN); 454 } 455 456 static void iommu_disable(struct amd_iommu *iommu) 457 { 458 if (!iommu->mmio_base) 459 return; 460 461 /* Disable command buffer */ 462 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); 463 464 /* Disable event logging and event interrupts */ 465 iommu_feature_disable(iommu, CONTROL_EVT_INT_EN); 466 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN); 467 468 /* Disable IOMMU GA_LOG */ 469 iommu_feature_disable(iommu, CONTROL_GALOG_EN); 470 iommu_feature_disable(iommu, CONTROL_GAINT_EN); 471 472 /* Disable IOMMU PPR logging */ 473 iommu_feature_disable(iommu, CONTROL_PPRLOG_EN); 474 iommu_feature_disable(iommu, CONTROL_PPRINT_EN); 475 476 /* Disable IOMMU hardware itself */ 477 iommu_feature_disable(iommu, CONTROL_IOMMU_EN); 478 479 /* Clear IRTE cache disabling bit */ 480 iommu_feature_disable(iommu, CONTROL_IRTCACHEDIS); 481 } 482 483 /* 484 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in 485 * the system has one. 486 */ 487 static u8 __iomem * __init iommu_map_mmio_space(u64 address, u64 end) 488 { 489 if (!request_mem_region(address, end, "amd_iommu")) { 490 pr_err("Can not reserve memory region %llx-%llx for mmio\n", 491 address, end); 492 pr_err("This is a BIOS bug. Please contact your hardware vendor\n"); 493 return NULL; 494 } 495 496 return (u8 __iomem *)ioremap(address, end); 497 } 498 499 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu) 500 { 501 if (iommu->mmio_base) 502 iounmap(iommu->mmio_base); 503 release_mem_region(iommu->mmio_phys, iommu->mmio_phys_end); 504 } 505 506 static inline u32 get_ivhd_header_size(struct ivhd_header *h) 507 { 508 u32 size = 0; 509 510 switch (h->type) { 511 case 0x10: 512 size = 24; 513 break; 514 case 0x11: 515 case 0x40: 516 size = 40; 517 break; 518 } 519 return size; 520 } 521 522 /**************************************************************************** 523 * 524 * The functions below belong to the first pass of AMD IOMMU ACPI table 525 * parsing. In this pass we try to find out the highest device id this 526 * code has to handle. Upon this information the size of the shared data 527 * structures is determined later. 528 * 529 ****************************************************************************/ 530 531 /* 532 * This function calculates the length of a given IVHD entry 533 */ 534 static inline int ivhd_entry_length(u8 *ivhd) 535 { 536 u32 type = ((struct ivhd_entry *)ivhd)->type; 537 538 if (type < 0x80) { 539 return 0x04 << (*ivhd >> 6); 540 } else if (type == IVHD_DEV_ACPI_HID) { 541 /* For ACPI_HID, offset 21 is uid len */ 542 return *((u8 *)ivhd + 21) + 22; 543 } 544 return 0; 545 } 546 547 /* 548 * After reading the highest device id from the IOMMU PCI capability header 549 * this function looks if there is a higher device id defined in the ACPI table 550 */ 551 static int __init find_last_devid_from_ivhd(struct ivhd_header *h) 552 { 553 u8 *p = (void *)h, *end = (void *)h; 554 struct ivhd_entry *dev; 555 int last_devid = -EINVAL; 556 557 u32 ivhd_size = get_ivhd_header_size(h); 558 559 if (!ivhd_size) { 560 pr_err("Unsupported IVHD type %#x\n", h->type); 561 return -EINVAL; 562 } 563 564 p += ivhd_size; 565 end += h->length; 566 567 while (p < end) { 568 dev = (struct ivhd_entry *)p; 569 switch (dev->type) { 570 case IVHD_DEV_ALL: 571 /* Use maximum BDF value for DEV_ALL */ 572 return 0xffff; 573 case IVHD_DEV_SELECT: 574 case IVHD_DEV_RANGE_END: 575 case IVHD_DEV_ALIAS: 576 case IVHD_DEV_EXT_SELECT: 577 /* all the above subfield types refer to device ids */ 578 if (dev->devid > last_devid) 579 last_devid = dev->devid; 580 break; 581 default: 582 break; 583 } 584 p += ivhd_entry_length(p); 585 } 586 587 WARN_ON(p != end); 588 589 return last_devid; 590 } 591 592 static int __init check_ivrs_checksum(struct acpi_table_header *table) 593 { 594 int i; 595 u8 checksum = 0, *p = (u8 *)table; 596 597 for (i = 0; i < table->length; ++i) 598 checksum += p[i]; 599 if (checksum != 0) { 600 /* ACPI table corrupt */ 601 pr_err(FW_BUG "IVRS invalid checksum\n"); 602 return -ENODEV; 603 } 604 605 return 0; 606 } 607 608 /* 609 * Iterate over all IVHD entries in the ACPI table and find the highest device 610 * id which we need to handle. This is the first of three functions which parse 611 * the ACPI table. So we check the checksum here. 612 */ 613 static int __init find_last_devid_acpi(struct acpi_table_header *table, u16 pci_seg) 614 { 615 u8 *p = (u8 *)table, *end = (u8 *)table; 616 struct ivhd_header *h; 617 int last_devid, last_bdf = 0; 618 619 p += IVRS_HEADER_LENGTH; 620 621 end += table->length; 622 while (p < end) { 623 h = (struct ivhd_header *)p; 624 if (h->pci_seg == pci_seg && 625 h->type == amd_iommu_target_ivhd_type) { 626 last_devid = find_last_devid_from_ivhd(h); 627 628 if (last_devid < 0) 629 return -EINVAL; 630 if (last_devid > last_bdf) 631 last_bdf = last_devid; 632 } 633 p += h->length; 634 } 635 WARN_ON(p != end); 636 637 return last_bdf; 638 } 639 640 /**************************************************************************** 641 * 642 * The following functions belong to the code path which parses the ACPI table 643 * the second time. In this ACPI parsing iteration we allocate IOMMU specific 644 * data structures, initialize the per PCI segment device/alias/rlookup table 645 * and also basically initialize the hardware. 646 * 647 ****************************************************************************/ 648 649 /* Allocate per PCI segment device table */ 650 static inline int __init alloc_dev_table(struct amd_iommu_pci_seg *pci_seg) 651 { 652 pci_seg->dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, 653 get_order(pci_seg->dev_table_size)); 654 if (!pci_seg->dev_table) 655 return -ENOMEM; 656 657 return 0; 658 } 659 660 static inline void free_dev_table(struct amd_iommu_pci_seg *pci_seg) 661 { 662 free_pages((unsigned long)pci_seg->dev_table, 663 get_order(pci_seg->dev_table_size)); 664 pci_seg->dev_table = NULL; 665 } 666 667 /* Allocate per PCI segment IOMMU rlookup table. */ 668 static inline int __init alloc_rlookup_table(struct amd_iommu_pci_seg *pci_seg) 669 { 670 pci_seg->rlookup_table = (void *)__get_free_pages( 671 GFP_KERNEL | __GFP_ZERO, 672 get_order(pci_seg->rlookup_table_size)); 673 if (pci_seg->rlookup_table == NULL) 674 return -ENOMEM; 675 676 return 0; 677 } 678 679 static inline void free_rlookup_table(struct amd_iommu_pci_seg *pci_seg) 680 { 681 free_pages((unsigned long)pci_seg->rlookup_table, 682 get_order(pci_seg->rlookup_table_size)); 683 pci_seg->rlookup_table = NULL; 684 } 685 686 static inline int __init alloc_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg) 687 { 688 pci_seg->irq_lookup_table = (void *)__get_free_pages( 689 GFP_KERNEL | __GFP_ZERO, 690 get_order(pci_seg->rlookup_table_size)); 691 kmemleak_alloc(pci_seg->irq_lookup_table, 692 pci_seg->rlookup_table_size, 1, GFP_KERNEL); 693 if (pci_seg->irq_lookup_table == NULL) 694 return -ENOMEM; 695 696 return 0; 697 } 698 699 static inline void free_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg) 700 { 701 kmemleak_free(pci_seg->irq_lookup_table); 702 free_pages((unsigned long)pci_seg->irq_lookup_table, 703 get_order(pci_seg->rlookup_table_size)); 704 pci_seg->irq_lookup_table = NULL; 705 } 706 707 static int __init alloc_alias_table(struct amd_iommu_pci_seg *pci_seg) 708 { 709 int i; 710 711 pci_seg->alias_table = (void *)__get_free_pages(GFP_KERNEL, 712 get_order(pci_seg->alias_table_size)); 713 if (!pci_seg->alias_table) 714 return -ENOMEM; 715 716 /* 717 * let all alias entries point to itself 718 */ 719 for (i = 0; i <= pci_seg->last_bdf; ++i) 720 pci_seg->alias_table[i] = i; 721 722 return 0; 723 } 724 725 static void __init free_alias_table(struct amd_iommu_pci_seg *pci_seg) 726 { 727 free_pages((unsigned long)pci_seg->alias_table, 728 get_order(pci_seg->alias_table_size)); 729 pci_seg->alias_table = NULL; 730 } 731 732 /* 733 * Allocates the command buffer. This buffer is per AMD IOMMU. We can 734 * write commands to that buffer later and the IOMMU will execute them 735 * asynchronously 736 */ 737 static int __init alloc_command_buffer(struct amd_iommu *iommu) 738 { 739 iommu->cmd_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 740 get_order(CMD_BUFFER_SIZE)); 741 742 return iommu->cmd_buf ? 0 : -ENOMEM; 743 } 744 745 /* 746 * Interrupt handler has processed all pending events and adjusted head 747 * and tail pointer. Reset overflow mask and restart logging again. 748 */ 749 static void amd_iommu_restart_log(struct amd_iommu *iommu, const char *evt_type, 750 u8 cntrl_intr, u8 cntrl_log, 751 u32 status_run_mask, u32 status_overflow_mask) 752 { 753 u32 status; 754 755 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); 756 if (status & status_run_mask) 757 return; 758 759 pr_info_ratelimited("IOMMU %s log restarting\n", evt_type); 760 761 iommu_feature_disable(iommu, cntrl_log); 762 iommu_feature_disable(iommu, cntrl_intr); 763 764 writel(status_overflow_mask, iommu->mmio_base + MMIO_STATUS_OFFSET); 765 766 iommu_feature_enable(iommu, cntrl_intr); 767 iommu_feature_enable(iommu, cntrl_log); 768 } 769 770 /* 771 * This function restarts event logging in case the IOMMU experienced 772 * an event log buffer overflow. 773 */ 774 void amd_iommu_restart_event_logging(struct amd_iommu *iommu) 775 { 776 amd_iommu_restart_log(iommu, "Event", CONTROL_EVT_INT_EN, 777 CONTROL_EVT_LOG_EN, MMIO_STATUS_EVT_RUN_MASK, 778 MMIO_STATUS_EVT_OVERFLOW_MASK); 779 } 780 781 /* 782 * This function restarts event logging in case the IOMMU experienced 783 * GA log overflow. 784 */ 785 void amd_iommu_restart_ga_log(struct amd_iommu *iommu) 786 { 787 amd_iommu_restart_log(iommu, "GA", CONTROL_GAINT_EN, 788 CONTROL_GALOG_EN, MMIO_STATUS_GALOG_RUN_MASK, 789 MMIO_STATUS_GALOG_OVERFLOW_MASK); 790 } 791 792 /* 793 * This function restarts ppr logging in case the IOMMU experienced 794 * PPR log overflow. 795 */ 796 void amd_iommu_restart_ppr_log(struct amd_iommu *iommu) 797 { 798 amd_iommu_restart_log(iommu, "PPR", CONTROL_PPRINT_EN, 799 CONTROL_PPRLOG_EN, MMIO_STATUS_PPR_RUN_MASK, 800 MMIO_STATUS_PPR_OVERFLOW_MASK); 801 } 802 803 /* 804 * This function resets the command buffer if the IOMMU stopped fetching 805 * commands from it. 806 */ 807 static void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu) 808 { 809 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); 810 811 writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); 812 writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); 813 iommu->cmd_buf_head = 0; 814 iommu->cmd_buf_tail = 0; 815 816 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN); 817 } 818 819 /* 820 * This function writes the command buffer address to the hardware and 821 * enables it. 822 */ 823 static void iommu_enable_command_buffer(struct amd_iommu *iommu) 824 { 825 u64 entry; 826 827 BUG_ON(iommu->cmd_buf == NULL); 828 829 entry = iommu_virt_to_phys(iommu->cmd_buf); 830 entry |= MMIO_CMD_SIZE_512; 831 832 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, 833 &entry, sizeof(entry)); 834 835 amd_iommu_reset_cmd_buffer(iommu); 836 } 837 838 /* 839 * This function disables the command buffer 840 */ 841 static void iommu_disable_command_buffer(struct amd_iommu *iommu) 842 { 843 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); 844 } 845 846 static void __init free_command_buffer(struct amd_iommu *iommu) 847 { 848 free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE)); 849 } 850 851 static void *__init iommu_alloc_4k_pages(struct amd_iommu *iommu, 852 gfp_t gfp, size_t size) 853 { 854 int order = get_order(size); 855 void *buf = (void *)__get_free_pages(gfp, order); 856 857 if (buf && 858 check_feature(FEATURE_SNP) && 859 set_memory_4k((unsigned long)buf, (1 << order))) { 860 free_pages((unsigned long)buf, order); 861 buf = NULL; 862 } 863 864 return buf; 865 } 866 867 /* allocates the memory where the IOMMU will log its events to */ 868 static int __init alloc_event_buffer(struct amd_iommu *iommu) 869 { 870 iommu->evt_buf = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO, 871 EVT_BUFFER_SIZE); 872 873 return iommu->evt_buf ? 0 : -ENOMEM; 874 } 875 876 static void iommu_enable_event_buffer(struct amd_iommu *iommu) 877 { 878 u64 entry; 879 880 BUG_ON(iommu->evt_buf == NULL); 881 882 entry = iommu_virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK; 883 884 memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET, 885 &entry, sizeof(entry)); 886 887 /* set head and tail to zero manually */ 888 writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); 889 writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); 890 891 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN); 892 } 893 894 /* 895 * This function disables the event log buffer 896 */ 897 static void iommu_disable_event_buffer(struct amd_iommu *iommu) 898 { 899 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN); 900 } 901 902 static void __init free_event_buffer(struct amd_iommu *iommu) 903 { 904 free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE)); 905 } 906 907 /* allocates the memory where the IOMMU will log its events to */ 908 static int __init alloc_ppr_log(struct amd_iommu *iommu) 909 { 910 iommu->ppr_log = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO, 911 PPR_LOG_SIZE); 912 913 return iommu->ppr_log ? 0 : -ENOMEM; 914 } 915 916 static void iommu_enable_ppr_log(struct amd_iommu *iommu) 917 { 918 u64 entry; 919 920 if (iommu->ppr_log == NULL) 921 return; 922 923 iommu_feature_enable(iommu, CONTROL_PPR_EN); 924 925 entry = iommu_virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512; 926 927 memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET, 928 &entry, sizeof(entry)); 929 930 /* set head and tail to zero manually */ 931 writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 932 writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); 933 934 iommu_feature_enable(iommu, CONTROL_PPRLOG_EN); 935 iommu_feature_enable(iommu, CONTROL_PPRINT_EN); 936 } 937 938 static void __init free_ppr_log(struct amd_iommu *iommu) 939 { 940 free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE)); 941 } 942 943 static void free_ga_log(struct amd_iommu *iommu) 944 { 945 #ifdef CONFIG_IRQ_REMAP 946 free_pages((unsigned long)iommu->ga_log, get_order(GA_LOG_SIZE)); 947 free_pages((unsigned long)iommu->ga_log_tail, get_order(8)); 948 #endif 949 } 950 951 #ifdef CONFIG_IRQ_REMAP 952 static int iommu_ga_log_enable(struct amd_iommu *iommu) 953 { 954 u32 status, i; 955 u64 entry; 956 957 if (!iommu->ga_log) 958 return -EINVAL; 959 960 entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512; 961 memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET, 962 &entry, sizeof(entry)); 963 entry = (iommu_virt_to_phys(iommu->ga_log_tail) & 964 (BIT_ULL(52)-1)) & ~7ULL; 965 memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET, 966 &entry, sizeof(entry)); 967 writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET); 968 writel(0x00, iommu->mmio_base + MMIO_GA_TAIL_OFFSET); 969 970 971 iommu_feature_enable(iommu, CONTROL_GAINT_EN); 972 iommu_feature_enable(iommu, CONTROL_GALOG_EN); 973 974 for (i = 0; i < MMIO_STATUS_TIMEOUT; ++i) { 975 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); 976 if (status & (MMIO_STATUS_GALOG_RUN_MASK)) 977 break; 978 udelay(10); 979 } 980 981 if (WARN_ON(i >= MMIO_STATUS_TIMEOUT)) 982 return -EINVAL; 983 984 return 0; 985 } 986 987 static int iommu_init_ga_log(struct amd_iommu *iommu) 988 { 989 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) 990 return 0; 991 992 iommu->ga_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 993 get_order(GA_LOG_SIZE)); 994 if (!iommu->ga_log) 995 goto err_out; 996 997 iommu->ga_log_tail = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 998 get_order(8)); 999 if (!iommu->ga_log_tail) 1000 goto err_out; 1001 1002 return 0; 1003 err_out: 1004 free_ga_log(iommu); 1005 return -EINVAL; 1006 } 1007 #endif /* CONFIG_IRQ_REMAP */ 1008 1009 static int __init alloc_cwwb_sem(struct amd_iommu *iommu) 1010 { 1011 iommu->cmd_sem = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO, 1); 1012 1013 return iommu->cmd_sem ? 0 : -ENOMEM; 1014 } 1015 1016 static void __init free_cwwb_sem(struct amd_iommu *iommu) 1017 { 1018 if (iommu->cmd_sem) 1019 free_page((unsigned long)iommu->cmd_sem); 1020 } 1021 1022 static void iommu_enable_xt(struct amd_iommu *iommu) 1023 { 1024 #ifdef CONFIG_IRQ_REMAP 1025 /* 1026 * XT mode (32-bit APIC destination ID) requires 1027 * GA mode (128-bit IRTE support) as a prerequisite. 1028 */ 1029 if (AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir) && 1030 amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE) 1031 iommu_feature_enable(iommu, CONTROL_XT_EN); 1032 #endif /* CONFIG_IRQ_REMAP */ 1033 } 1034 1035 static void iommu_enable_gt(struct amd_iommu *iommu) 1036 { 1037 if (!check_feature(FEATURE_GT)) 1038 return; 1039 1040 iommu_feature_enable(iommu, CONTROL_GT_EN); 1041 } 1042 1043 /* sets a specific bit in the device table entry. */ 1044 static void __set_dev_entry_bit(struct dev_table_entry *dev_table, 1045 u16 devid, u8 bit) 1046 { 1047 int i = (bit >> 6) & 0x03; 1048 int _bit = bit & 0x3f; 1049 1050 dev_table[devid].data[i] |= (1UL << _bit); 1051 } 1052 1053 static void set_dev_entry_bit(struct amd_iommu *iommu, u16 devid, u8 bit) 1054 { 1055 struct dev_table_entry *dev_table = get_dev_table(iommu); 1056 1057 return __set_dev_entry_bit(dev_table, devid, bit); 1058 } 1059 1060 static int __get_dev_entry_bit(struct dev_table_entry *dev_table, 1061 u16 devid, u8 bit) 1062 { 1063 int i = (bit >> 6) & 0x03; 1064 int _bit = bit & 0x3f; 1065 1066 return (dev_table[devid].data[i] & (1UL << _bit)) >> _bit; 1067 } 1068 1069 static int get_dev_entry_bit(struct amd_iommu *iommu, u16 devid, u8 bit) 1070 { 1071 struct dev_table_entry *dev_table = get_dev_table(iommu); 1072 1073 return __get_dev_entry_bit(dev_table, devid, bit); 1074 } 1075 1076 static bool __copy_device_table(struct amd_iommu *iommu) 1077 { 1078 u64 int_ctl, int_tab_len, entry = 0; 1079 struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg; 1080 struct dev_table_entry *old_devtb = NULL; 1081 u32 lo, hi, devid, old_devtb_size; 1082 phys_addr_t old_devtb_phys; 1083 u16 dom_id, dte_v, irq_v; 1084 gfp_t gfp_flag; 1085 u64 tmp; 1086 1087 /* Each IOMMU use separate device table with the same size */ 1088 lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET); 1089 hi = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET + 4); 1090 entry = (((u64) hi) << 32) + lo; 1091 1092 old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12; 1093 if (old_devtb_size != pci_seg->dev_table_size) { 1094 pr_err("The device table size of IOMMU:%d is not expected!\n", 1095 iommu->index); 1096 return false; 1097 } 1098 1099 /* 1100 * When SME is enabled in the first kernel, the entry includes the 1101 * memory encryption mask(sme_me_mask), we must remove the memory 1102 * encryption mask to obtain the true physical address in kdump kernel. 1103 */ 1104 old_devtb_phys = __sme_clr(entry) & PAGE_MASK; 1105 1106 if (old_devtb_phys >= 0x100000000ULL) { 1107 pr_err("The address of old device table is above 4G, not trustworthy!\n"); 1108 return false; 1109 } 1110 old_devtb = (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT) && is_kdump_kernel()) 1111 ? (__force void *)ioremap_encrypted(old_devtb_phys, 1112 pci_seg->dev_table_size) 1113 : memremap(old_devtb_phys, pci_seg->dev_table_size, MEMREMAP_WB); 1114 1115 if (!old_devtb) 1116 return false; 1117 1118 gfp_flag = GFP_KERNEL | __GFP_ZERO | GFP_DMA32; 1119 pci_seg->old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag, 1120 get_order(pci_seg->dev_table_size)); 1121 if (pci_seg->old_dev_tbl_cpy == NULL) { 1122 pr_err("Failed to allocate memory for copying old device table!\n"); 1123 memunmap(old_devtb); 1124 return false; 1125 } 1126 1127 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) { 1128 pci_seg->old_dev_tbl_cpy[devid] = old_devtb[devid]; 1129 dom_id = old_devtb[devid].data[1] & DEV_DOMID_MASK; 1130 dte_v = old_devtb[devid].data[0] & DTE_FLAG_V; 1131 1132 if (dte_v && dom_id) { 1133 pci_seg->old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0]; 1134 pci_seg->old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1]; 1135 __set_bit(dom_id, amd_iommu_pd_alloc_bitmap); 1136 /* If gcr3 table existed, mask it out */ 1137 if (old_devtb[devid].data[0] & DTE_FLAG_GV) { 1138 tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B; 1139 tmp |= DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C; 1140 pci_seg->old_dev_tbl_cpy[devid].data[1] &= ~tmp; 1141 tmp = DTE_GCR3_VAL_A(~0ULL) << DTE_GCR3_SHIFT_A; 1142 tmp |= DTE_FLAG_GV; 1143 pci_seg->old_dev_tbl_cpy[devid].data[0] &= ~tmp; 1144 } 1145 } 1146 1147 irq_v = old_devtb[devid].data[2] & DTE_IRQ_REMAP_ENABLE; 1148 int_ctl = old_devtb[devid].data[2] & DTE_IRQ_REMAP_INTCTL_MASK; 1149 int_tab_len = old_devtb[devid].data[2] & DTE_INTTABLEN_MASK; 1150 if (irq_v && (int_ctl || int_tab_len)) { 1151 if ((int_ctl != DTE_IRQ_REMAP_INTCTL) || 1152 (int_tab_len != DTE_INTTABLEN)) { 1153 pr_err("Wrong old irq remapping flag: %#x\n", devid); 1154 memunmap(old_devtb); 1155 return false; 1156 } 1157 1158 pci_seg->old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2]; 1159 } 1160 } 1161 memunmap(old_devtb); 1162 1163 return true; 1164 } 1165 1166 static bool copy_device_table(void) 1167 { 1168 struct amd_iommu *iommu; 1169 struct amd_iommu_pci_seg *pci_seg; 1170 1171 if (!amd_iommu_pre_enabled) 1172 return false; 1173 1174 pr_warn("Translation is already enabled - trying to copy translation structures\n"); 1175 1176 /* 1177 * All IOMMUs within PCI segment shares common device table. 1178 * Hence copy device table only once per PCI segment. 1179 */ 1180 for_each_pci_segment(pci_seg) { 1181 for_each_iommu(iommu) { 1182 if (pci_seg->id != iommu->pci_seg->id) 1183 continue; 1184 if (!__copy_device_table(iommu)) 1185 return false; 1186 break; 1187 } 1188 } 1189 1190 return true; 1191 } 1192 1193 void amd_iommu_apply_erratum_63(struct amd_iommu *iommu, u16 devid) 1194 { 1195 int sysmgt; 1196 1197 sysmgt = get_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT1) | 1198 (get_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT2) << 1); 1199 1200 if (sysmgt == 0x01) 1201 set_dev_entry_bit(iommu, devid, DEV_ENTRY_IW); 1202 } 1203 1204 /* 1205 * This function takes the device specific flags read from the ACPI 1206 * table and sets up the device table entry with that information 1207 */ 1208 static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu, 1209 u16 devid, u32 flags, u32 ext_flags) 1210 { 1211 if (flags & ACPI_DEVFLAG_INITPASS) 1212 set_dev_entry_bit(iommu, devid, DEV_ENTRY_INIT_PASS); 1213 if (flags & ACPI_DEVFLAG_EXTINT) 1214 set_dev_entry_bit(iommu, devid, DEV_ENTRY_EINT_PASS); 1215 if (flags & ACPI_DEVFLAG_NMI) 1216 set_dev_entry_bit(iommu, devid, DEV_ENTRY_NMI_PASS); 1217 if (flags & ACPI_DEVFLAG_SYSMGT1) 1218 set_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT1); 1219 if (flags & ACPI_DEVFLAG_SYSMGT2) 1220 set_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT2); 1221 if (flags & ACPI_DEVFLAG_LINT0) 1222 set_dev_entry_bit(iommu, devid, DEV_ENTRY_LINT0_PASS); 1223 if (flags & ACPI_DEVFLAG_LINT1) 1224 set_dev_entry_bit(iommu, devid, DEV_ENTRY_LINT1_PASS); 1225 1226 amd_iommu_apply_erratum_63(iommu, devid); 1227 1228 amd_iommu_set_rlookup_table(iommu, devid); 1229 } 1230 1231 int __init add_special_device(u8 type, u8 id, u32 *devid, bool cmd_line) 1232 { 1233 struct devid_map *entry; 1234 struct list_head *list; 1235 1236 if (type == IVHD_SPECIAL_IOAPIC) 1237 list = &ioapic_map; 1238 else if (type == IVHD_SPECIAL_HPET) 1239 list = &hpet_map; 1240 else 1241 return -EINVAL; 1242 1243 list_for_each_entry(entry, list, list) { 1244 if (!(entry->id == id && entry->cmd_line)) 1245 continue; 1246 1247 pr_info("Command-line override present for %s id %d - ignoring\n", 1248 type == IVHD_SPECIAL_IOAPIC ? "IOAPIC" : "HPET", id); 1249 1250 *devid = entry->devid; 1251 1252 return 0; 1253 } 1254 1255 entry = kzalloc(sizeof(*entry), GFP_KERNEL); 1256 if (!entry) 1257 return -ENOMEM; 1258 1259 entry->id = id; 1260 entry->devid = *devid; 1261 entry->cmd_line = cmd_line; 1262 1263 list_add_tail(&entry->list, list); 1264 1265 return 0; 1266 } 1267 1268 static int __init add_acpi_hid_device(u8 *hid, u8 *uid, u32 *devid, 1269 bool cmd_line) 1270 { 1271 struct acpihid_map_entry *entry; 1272 struct list_head *list = &acpihid_map; 1273 1274 list_for_each_entry(entry, list, list) { 1275 if (strcmp(entry->hid, hid) || 1276 (*uid && *entry->uid && strcmp(entry->uid, uid)) || 1277 !entry->cmd_line) 1278 continue; 1279 1280 pr_info("Command-line override for hid:%s uid:%s\n", 1281 hid, uid); 1282 *devid = entry->devid; 1283 return 0; 1284 } 1285 1286 entry = kzalloc(sizeof(*entry), GFP_KERNEL); 1287 if (!entry) 1288 return -ENOMEM; 1289 1290 memcpy(entry->uid, uid, strlen(uid)); 1291 memcpy(entry->hid, hid, strlen(hid)); 1292 entry->devid = *devid; 1293 entry->cmd_line = cmd_line; 1294 entry->root_devid = (entry->devid & (~0x7)); 1295 1296 pr_info("%s, add hid:%s, uid:%s, rdevid:%d\n", 1297 entry->cmd_line ? "cmd" : "ivrs", 1298 entry->hid, entry->uid, entry->root_devid); 1299 1300 list_add_tail(&entry->list, list); 1301 return 0; 1302 } 1303 1304 static int __init add_early_maps(void) 1305 { 1306 int i, ret; 1307 1308 for (i = 0; i < early_ioapic_map_size; ++i) { 1309 ret = add_special_device(IVHD_SPECIAL_IOAPIC, 1310 early_ioapic_map[i].id, 1311 &early_ioapic_map[i].devid, 1312 early_ioapic_map[i].cmd_line); 1313 if (ret) 1314 return ret; 1315 } 1316 1317 for (i = 0; i < early_hpet_map_size; ++i) { 1318 ret = add_special_device(IVHD_SPECIAL_HPET, 1319 early_hpet_map[i].id, 1320 &early_hpet_map[i].devid, 1321 early_hpet_map[i].cmd_line); 1322 if (ret) 1323 return ret; 1324 } 1325 1326 for (i = 0; i < early_acpihid_map_size; ++i) { 1327 ret = add_acpi_hid_device(early_acpihid_map[i].hid, 1328 early_acpihid_map[i].uid, 1329 &early_acpihid_map[i].devid, 1330 early_acpihid_map[i].cmd_line); 1331 if (ret) 1332 return ret; 1333 } 1334 1335 return 0; 1336 } 1337 1338 /* 1339 * Takes a pointer to an AMD IOMMU entry in the ACPI table and 1340 * initializes the hardware and our data structures with it. 1341 */ 1342 static int __init init_iommu_from_acpi(struct amd_iommu *iommu, 1343 struct ivhd_header *h) 1344 { 1345 u8 *p = (u8 *)h; 1346 u8 *end = p, flags = 0; 1347 u16 devid = 0, devid_start = 0, devid_to = 0, seg_id; 1348 u32 dev_i, ext_flags = 0; 1349 bool alias = false; 1350 struct ivhd_entry *e; 1351 struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg; 1352 u32 ivhd_size; 1353 int ret; 1354 1355 1356 ret = add_early_maps(); 1357 if (ret) 1358 return ret; 1359 1360 amd_iommu_apply_ivrs_quirks(); 1361 1362 /* 1363 * First save the recommended feature enable bits from ACPI 1364 */ 1365 iommu->acpi_flags = h->flags; 1366 1367 /* 1368 * Done. Now parse the device entries 1369 */ 1370 ivhd_size = get_ivhd_header_size(h); 1371 if (!ivhd_size) { 1372 pr_err("Unsupported IVHD type %#x\n", h->type); 1373 return -EINVAL; 1374 } 1375 1376 p += ivhd_size; 1377 1378 end += h->length; 1379 1380 1381 while (p < end) { 1382 e = (struct ivhd_entry *)p; 1383 seg_id = pci_seg->id; 1384 1385 switch (e->type) { 1386 case IVHD_DEV_ALL: 1387 1388 DUMP_printk(" DEV_ALL\t\t\tflags: %02x\n", e->flags); 1389 1390 for (dev_i = 0; dev_i <= pci_seg->last_bdf; ++dev_i) 1391 set_dev_entry_from_acpi(iommu, dev_i, e->flags, 0); 1392 break; 1393 case IVHD_DEV_SELECT: 1394 1395 DUMP_printk(" DEV_SELECT\t\t\t devid: %04x:%02x:%02x.%x " 1396 "flags: %02x\n", 1397 seg_id, PCI_BUS_NUM(e->devid), 1398 PCI_SLOT(e->devid), 1399 PCI_FUNC(e->devid), 1400 e->flags); 1401 1402 devid = e->devid; 1403 set_dev_entry_from_acpi(iommu, devid, e->flags, 0); 1404 break; 1405 case IVHD_DEV_SELECT_RANGE_START: 1406 1407 DUMP_printk(" DEV_SELECT_RANGE_START\t " 1408 "devid: %04x:%02x:%02x.%x flags: %02x\n", 1409 seg_id, PCI_BUS_NUM(e->devid), 1410 PCI_SLOT(e->devid), 1411 PCI_FUNC(e->devid), 1412 e->flags); 1413 1414 devid_start = e->devid; 1415 flags = e->flags; 1416 ext_flags = 0; 1417 alias = false; 1418 break; 1419 case IVHD_DEV_ALIAS: 1420 1421 DUMP_printk(" DEV_ALIAS\t\t\t devid: %04x:%02x:%02x.%x " 1422 "flags: %02x devid_to: %02x:%02x.%x\n", 1423 seg_id, PCI_BUS_NUM(e->devid), 1424 PCI_SLOT(e->devid), 1425 PCI_FUNC(e->devid), 1426 e->flags, 1427 PCI_BUS_NUM(e->ext >> 8), 1428 PCI_SLOT(e->ext >> 8), 1429 PCI_FUNC(e->ext >> 8)); 1430 1431 devid = e->devid; 1432 devid_to = e->ext >> 8; 1433 set_dev_entry_from_acpi(iommu, devid , e->flags, 0); 1434 set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0); 1435 pci_seg->alias_table[devid] = devid_to; 1436 break; 1437 case IVHD_DEV_ALIAS_RANGE: 1438 1439 DUMP_printk(" DEV_ALIAS_RANGE\t\t " 1440 "devid: %04x:%02x:%02x.%x flags: %02x " 1441 "devid_to: %04x:%02x:%02x.%x\n", 1442 seg_id, PCI_BUS_NUM(e->devid), 1443 PCI_SLOT(e->devid), 1444 PCI_FUNC(e->devid), 1445 e->flags, 1446 seg_id, PCI_BUS_NUM(e->ext >> 8), 1447 PCI_SLOT(e->ext >> 8), 1448 PCI_FUNC(e->ext >> 8)); 1449 1450 devid_start = e->devid; 1451 flags = e->flags; 1452 devid_to = e->ext >> 8; 1453 ext_flags = 0; 1454 alias = true; 1455 break; 1456 case IVHD_DEV_EXT_SELECT: 1457 1458 DUMP_printk(" DEV_EXT_SELECT\t\t devid: %04x:%02x:%02x.%x " 1459 "flags: %02x ext: %08x\n", 1460 seg_id, PCI_BUS_NUM(e->devid), 1461 PCI_SLOT(e->devid), 1462 PCI_FUNC(e->devid), 1463 e->flags, e->ext); 1464 1465 devid = e->devid; 1466 set_dev_entry_from_acpi(iommu, devid, e->flags, 1467 e->ext); 1468 break; 1469 case IVHD_DEV_EXT_SELECT_RANGE: 1470 1471 DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: " 1472 "%04x:%02x:%02x.%x flags: %02x ext: %08x\n", 1473 seg_id, PCI_BUS_NUM(e->devid), 1474 PCI_SLOT(e->devid), 1475 PCI_FUNC(e->devid), 1476 e->flags, e->ext); 1477 1478 devid_start = e->devid; 1479 flags = e->flags; 1480 ext_flags = e->ext; 1481 alias = false; 1482 break; 1483 case IVHD_DEV_RANGE_END: 1484 1485 DUMP_printk(" DEV_RANGE_END\t\t devid: %04x:%02x:%02x.%x\n", 1486 seg_id, PCI_BUS_NUM(e->devid), 1487 PCI_SLOT(e->devid), 1488 PCI_FUNC(e->devid)); 1489 1490 devid = e->devid; 1491 for (dev_i = devid_start; dev_i <= devid; ++dev_i) { 1492 if (alias) { 1493 pci_seg->alias_table[dev_i] = devid_to; 1494 set_dev_entry_from_acpi(iommu, 1495 devid_to, flags, ext_flags); 1496 } 1497 set_dev_entry_from_acpi(iommu, dev_i, 1498 flags, ext_flags); 1499 } 1500 break; 1501 case IVHD_DEV_SPECIAL: { 1502 u8 handle, type; 1503 const char *var; 1504 u32 devid; 1505 int ret; 1506 1507 handle = e->ext & 0xff; 1508 devid = PCI_SEG_DEVID_TO_SBDF(seg_id, (e->ext >> 8)); 1509 type = (e->ext >> 24) & 0xff; 1510 1511 if (type == IVHD_SPECIAL_IOAPIC) 1512 var = "IOAPIC"; 1513 else if (type == IVHD_SPECIAL_HPET) 1514 var = "HPET"; 1515 else 1516 var = "UNKNOWN"; 1517 1518 DUMP_printk(" DEV_SPECIAL(%s[%d])\t\tdevid: %04x:%02x:%02x.%x\n", 1519 var, (int)handle, 1520 seg_id, PCI_BUS_NUM(devid), 1521 PCI_SLOT(devid), 1522 PCI_FUNC(devid)); 1523 1524 ret = add_special_device(type, handle, &devid, false); 1525 if (ret) 1526 return ret; 1527 1528 /* 1529 * add_special_device might update the devid in case a 1530 * command-line override is present. So call 1531 * set_dev_entry_from_acpi after add_special_device. 1532 */ 1533 set_dev_entry_from_acpi(iommu, devid, e->flags, 0); 1534 1535 break; 1536 } 1537 case IVHD_DEV_ACPI_HID: { 1538 u32 devid; 1539 u8 hid[ACPIHID_HID_LEN]; 1540 u8 uid[ACPIHID_UID_LEN]; 1541 int ret; 1542 1543 if (h->type != 0x40) { 1544 pr_err(FW_BUG "Invalid IVHD device type %#x\n", 1545 e->type); 1546 break; 1547 } 1548 1549 BUILD_BUG_ON(sizeof(e->ext_hid) != ACPIHID_HID_LEN - 1); 1550 memcpy(hid, &e->ext_hid, ACPIHID_HID_LEN - 1); 1551 hid[ACPIHID_HID_LEN - 1] = '\0'; 1552 1553 if (!(*hid)) { 1554 pr_err(FW_BUG "Invalid HID.\n"); 1555 break; 1556 } 1557 1558 uid[0] = '\0'; 1559 switch (e->uidf) { 1560 case UID_NOT_PRESENT: 1561 1562 if (e->uidl != 0) 1563 pr_warn(FW_BUG "Invalid UID length.\n"); 1564 1565 break; 1566 case UID_IS_INTEGER: 1567 1568 sprintf(uid, "%d", e->uid); 1569 1570 break; 1571 case UID_IS_CHARACTER: 1572 1573 memcpy(uid, &e->uid, e->uidl); 1574 uid[e->uidl] = '\0'; 1575 1576 break; 1577 default: 1578 break; 1579 } 1580 1581 devid = PCI_SEG_DEVID_TO_SBDF(seg_id, e->devid); 1582 DUMP_printk(" DEV_ACPI_HID(%s[%s])\t\tdevid: %04x:%02x:%02x.%x\n", 1583 hid, uid, seg_id, 1584 PCI_BUS_NUM(devid), 1585 PCI_SLOT(devid), 1586 PCI_FUNC(devid)); 1587 1588 flags = e->flags; 1589 1590 ret = add_acpi_hid_device(hid, uid, &devid, false); 1591 if (ret) 1592 return ret; 1593 1594 /* 1595 * add_special_device might update the devid in case a 1596 * command-line override is present. So call 1597 * set_dev_entry_from_acpi after add_special_device. 1598 */ 1599 set_dev_entry_from_acpi(iommu, devid, e->flags, 0); 1600 1601 break; 1602 } 1603 default: 1604 break; 1605 } 1606 1607 p += ivhd_entry_length(p); 1608 } 1609 1610 return 0; 1611 } 1612 1613 /* Allocate PCI segment data structure */ 1614 static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id, 1615 struct acpi_table_header *ivrs_base) 1616 { 1617 struct amd_iommu_pci_seg *pci_seg; 1618 int last_bdf; 1619 1620 /* 1621 * First parse ACPI tables to find the largest Bus/Dev/Func we need to 1622 * handle in this PCI segment. Upon this information the shared data 1623 * structures for the PCI segments in the system will be allocated. 1624 */ 1625 last_bdf = find_last_devid_acpi(ivrs_base, id); 1626 if (last_bdf < 0) 1627 return NULL; 1628 1629 pci_seg = kzalloc(sizeof(struct amd_iommu_pci_seg), GFP_KERNEL); 1630 if (pci_seg == NULL) 1631 return NULL; 1632 1633 pci_seg->last_bdf = last_bdf; 1634 DUMP_printk("PCI segment : 0x%0x, last bdf : 0x%04x\n", id, last_bdf); 1635 pci_seg->dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE, last_bdf); 1636 pci_seg->alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE, last_bdf); 1637 pci_seg->rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE, last_bdf); 1638 1639 pci_seg->id = id; 1640 init_llist_head(&pci_seg->dev_data_list); 1641 INIT_LIST_HEAD(&pci_seg->unity_map); 1642 list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list); 1643 1644 if (alloc_dev_table(pci_seg)) 1645 return NULL; 1646 if (alloc_alias_table(pci_seg)) 1647 return NULL; 1648 if (alloc_rlookup_table(pci_seg)) 1649 return NULL; 1650 1651 return pci_seg; 1652 } 1653 1654 static struct amd_iommu_pci_seg *__init get_pci_segment(u16 id, 1655 struct acpi_table_header *ivrs_base) 1656 { 1657 struct amd_iommu_pci_seg *pci_seg; 1658 1659 for_each_pci_segment(pci_seg) { 1660 if (pci_seg->id == id) 1661 return pci_seg; 1662 } 1663 1664 return alloc_pci_segment(id, ivrs_base); 1665 } 1666 1667 static void __init free_pci_segments(void) 1668 { 1669 struct amd_iommu_pci_seg *pci_seg, *next; 1670 1671 for_each_pci_segment_safe(pci_seg, next) { 1672 list_del(&pci_seg->list); 1673 free_irq_lookup_table(pci_seg); 1674 free_rlookup_table(pci_seg); 1675 free_alias_table(pci_seg); 1676 free_dev_table(pci_seg); 1677 kfree(pci_seg); 1678 } 1679 } 1680 1681 static void __init free_iommu_one(struct amd_iommu *iommu) 1682 { 1683 free_cwwb_sem(iommu); 1684 free_command_buffer(iommu); 1685 free_event_buffer(iommu); 1686 free_ppr_log(iommu); 1687 free_ga_log(iommu); 1688 iommu_unmap_mmio_space(iommu); 1689 } 1690 1691 static void __init free_iommu_all(void) 1692 { 1693 struct amd_iommu *iommu, *next; 1694 1695 for_each_iommu_safe(iommu, next) { 1696 list_del(&iommu->list); 1697 free_iommu_one(iommu); 1698 kfree(iommu); 1699 } 1700 } 1701 1702 /* 1703 * Family15h Model 10h-1fh erratum 746 (IOMMU Logging May Stall Translations) 1704 * Workaround: 1705 * BIOS should disable L2B micellaneous clock gating by setting 1706 * L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b 1707 */ 1708 static void amd_iommu_erratum_746_workaround(struct amd_iommu *iommu) 1709 { 1710 u32 value; 1711 1712 if ((boot_cpu_data.x86 != 0x15) || 1713 (boot_cpu_data.x86_model < 0x10) || 1714 (boot_cpu_data.x86_model > 0x1f)) 1715 return; 1716 1717 pci_write_config_dword(iommu->dev, 0xf0, 0x90); 1718 pci_read_config_dword(iommu->dev, 0xf4, &value); 1719 1720 if (value & BIT(2)) 1721 return; 1722 1723 /* Select NB indirect register 0x90 and enable writing */ 1724 pci_write_config_dword(iommu->dev, 0xf0, 0x90 | (1 << 8)); 1725 1726 pci_write_config_dword(iommu->dev, 0xf4, value | 0x4); 1727 pci_info(iommu->dev, "Applying erratum 746 workaround\n"); 1728 1729 /* Clear the enable writing bit */ 1730 pci_write_config_dword(iommu->dev, 0xf0, 0x90); 1731 } 1732 1733 /* 1734 * Family15h Model 30h-3fh (IOMMU Mishandles ATS Write Permission) 1735 * Workaround: 1736 * BIOS should enable ATS write permission check by setting 1737 * L2_DEBUG_3[AtsIgnoreIWDis](D0F2xF4_x47[0]) = 1b 1738 */ 1739 static void amd_iommu_ats_write_check_workaround(struct amd_iommu *iommu) 1740 { 1741 u32 value; 1742 1743 if ((boot_cpu_data.x86 != 0x15) || 1744 (boot_cpu_data.x86_model < 0x30) || 1745 (boot_cpu_data.x86_model > 0x3f)) 1746 return; 1747 1748 /* Test L2_DEBUG_3[AtsIgnoreIWDis] == 1 */ 1749 value = iommu_read_l2(iommu, 0x47); 1750 1751 if (value & BIT(0)) 1752 return; 1753 1754 /* Set L2_DEBUG_3[AtsIgnoreIWDis] = 1 */ 1755 iommu_write_l2(iommu, 0x47, value | BIT(0)); 1756 1757 pci_info(iommu->dev, "Applying ATS write check workaround\n"); 1758 } 1759 1760 /* 1761 * This function glues the initialization function for one IOMMU 1762 * together and also allocates the command buffer and programs the 1763 * hardware. It does NOT enable the IOMMU. This is done afterwards. 1764 */ 1765 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h, 1766 struct acpi_table_header *ivrs_base) 1767 { 1768 struct amd_iommu_pci_seg *pci_seg; 1769 1770 pci_seg = get_pci_segment(h->pci_seg, ivrs_base); 1771 if (pci_seg == NULL) 1772 return -ENOMEM; 1773 iommu->pci_seg = pci_seg; 1774 1775 raw_spin_lock_init(&iommu->lock); 1776 atomic64_set(&iommu->cmd_sem_val, 0); 1777 1778 /* Add IOMMU to internal data structures */ 1779 list_add_tail(&iommu->list, &amd_iommu_list); 1780 iommu->index = amd_iommus_present++; 1781 1782 if (unlikely(iommu->index >= MAX_IOMMUS)) { 1783 WARN(1, "System has more IOMMUs than supported by this driver\n"); 1784 return -ENOSYS; 1785 } 1786 1787 /* Index is fine - add IOMMU to the array */ 1788 amd_iommus[iommu->index] = iommu; 1789 1790 /* 1791 * Copy data from ACPI table entry to the iommu struct 1792 */ 1793 iommu->devid = h->devid; 1794 iommu->cap_ptr = h->cap_ptr; 1795 iommu->mmio_phys = h->mmio_phys; 1796 1797 switch (h->type) { 1798 case 0x10: 1799 /* Check if IVHD EFR contains proper max banks/counters */ 1800 if ((h->efr_attr != 0) && 1801 ((h->efr_attr & (0xF << 13)) != 0) && 1802 ((h->efr_attr & (0x3F << 17)) != 0)) 1803 iommu->mmio_phys_end = MMIO_REG_END_OFFSET; 1804 else 1805 iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET; 1806 1807 /* 1808 * Note: GA (128-bit IRTE) mode requires cmpxchg16b supports. 1809 * GAM also requires GA mode. Therefore, we need to 1810 * check cmpxchg16b support before enabling it. 1811 */ 1812 if (!boot_cpu_has(X86_FEATURE_CX16) || 1813 ((h->efr_attr & (0x1 << IOMMU_FEAT_GASUP_SHIFT)) == 0)) 1814 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY; 1815 break; 1816 case 0x11: 1817 case 0x40: 1818 if (h->efr_reg & (1 << 9)) 1819 iommu->mmio_phys_end = MMIO_REG_END_OFFSET; 1820 else 1821 iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET; 1822 1823 /* 1824 * Note: GA (128-bit IRTE) mode requires cmpxchg16b supports. 1825 * XT, GAM also requires GA mode. Therefore, we need to 1826 * check cmpxchg16b support before enabling them. 1827 */ 1828 if (!boot_cpu_has(X86_FEATURE_CX16) || 1829 ((h->efr_reg & (0x1 << IOMMU_EFR_GASUP_SHIFT)) == 0)) { 1830 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY; 1831 break; 1832 } 1833 1834 if (h->efr_reg & BIT(IOMMU_EFR_XTSUP_SHIFT)) 1835 amd_iommu_xt_mode = IRQ_REMAP_X2APIC_MODE; 1836 1837 early_iommu_features_init(iommu, h); 1838 1839 break; 1840 default: 1841 return -EINVAL; 1842 } 1843 1844 iommu->mmio_base = iommu_map_mmio_space(iommu->mmio_phys, 1845 iommu->mmio_phys_end); 1846 if (!iommu->mmio_base) 1847 return -ENOMEM; 1848 1849 return init_iommu_from_acpi(iommu, h); 1850 } 1851 1852 static int __init init_iommu_one_late(struct amd_iommu *iommu) 1853 { 1854 int ret; 1855 1856 if (alloc_cwwb_sem(iommu)) 1857 return -ENOMEM; 1858 1859 if (alloc_command_buffer(iommu)) 1860 return -ENOMEM; 1861 1862 if (alloc_event_buffer(iommu)) 1863 return -ENOMEM; 1864 1865 iommu->int_enabled = false; 1866 1867 init_translation_status(iommu); 1868 if (translation_pre_enabled(iommu) && !is_kdump_kernel()) { 1869 iommu_disable(iommu); 1870 clear_translation_pre_enabled(iommu); 1871 pr_warn("Translation was enabled for IOMMU:%d but we are not in kdump mode\n", 1872 iommu->index); 1873 } 1874 if (amd_iommu_pre_enabled) 1875 amd_iommu_pre_enabled = translation_pre_enabled(iommu); 1876 1877 if (amd_iommu_irq_remap) { 1878 ret = amd_iommu_create_irq_domain(iommu); 1879 if (ret) 1880 return ret; 1881 } 1882 1883 /* 1884 * Make sure IOMMU is not considered to translate itself. The IVRS 1885 * table tells us so, but this is a lie! 1886 */ 1887 iommu->pci_seg->rlookup_table[iommu->devid] = NULL; 1888 1889 return 0; 1890 } 1891 1892 /** 1893 * get_highest_supported_ivhd_type - Look up the appropriate IVHD type 1894 * @ivrs: Pointer to the IVRS header 1895 * 1896 * This function search through all IVDB of the maximum supported IVHD 1897 */ 1898 static u8 get_highest_supported_ivhd_type(struct acpi_table_header *ivrs) 1899 { 1900 u8 *base = (u8 *)ivrs; 1901 struct ivhd_header *ivhd = (struct ivhd_header *) 1902 (base + IVRS_HEADER_LENGTH); 1903 u8 last_type = ivhd->type; 1904 u16 devid = ivhd->devid; 1905 1906 while (((u8 *)ivhd - base < ivrs->length) && 1907 (ivhd->type <= ACPI_IVHD_TYPE_MAX_SUPPORTED)) { 1908 u8 *p = (u8 *) ivhd; 1909 1910 if (ivhd->devid == devid) 1911 last_type = ivhd->type; 1912 ivhd = (struct ivhd_header *)(p + ivhd->length); 1913 } 1914 1915 return last_type; 1916 } 1917 1918 /* 1919 * Iterates over all IOMMU entries in the ACPI table, allocates the 1920 * IOMMU structure and initializes it with init_iommu_one() 1921 */ 1922 static int __init init_iommu_all(struct acpi_table_header *table) 1923 { 1924 u8 *p = (u8 *)table, *end = (u8 *)table; 1925 struct ivhd_header *h; 1926 struct amd_iommu *iommu; 1927 int ret; 1928 1929 end += table->length; 1930 p += IVRS_HEADER_LENGTH; 1931 1932 /* Phase 1: Process all IVHD blocks */ 1933 while (p < end) { 1934 h = (struct ivhd_header *)p; 1935 if (*p == amd_iommu_target_ivhd_type) { 1936 1937 DUMP_printk("device: %04x:%02x:%02x.%01x cap: %04x " 1938 "flags: %01x info %04x\n", 1939 h->pci_seg, PCI_BUS_NUM(h->devid), 1940 PCI_SLOT(h->devid), PCI_FUNC(h->devid), 1941 h->cap_ptr, h->flags, h->info); 1942 DUMP_printk(" mmio-addr: %016llx\n", 1943 h->mmio_phys); 1944 1945 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL); 1946 if (iommu == NULL) 1947 return -ENOMEM; 1948 1949 ret = init_iommu_one(iommu, h, table); 1950 if (ret) 1951 return ret; 1952 } 1953 p += h->length; 1954 1955 } 1956 WARN_ON(p != end); 1957 1958 /* Phase 2 : Early feature support check */ 1959 get_global_efr(); 1960 1961 /* Phase 3 : Enabling IOMMU features */ 1962 for_each_iommu(iommu) { 1963 ret = init_iommu_one_late(iommu); 1964 if (ret) 1965 return ret; 1966 } 1967 1968 return 0; 1969 } 1970 1971 static void init_iommu_perf_ctr(struct amd_iommu *iommu) 1972 { 1973 u64 val; 1974 struct pci_dev *pdev = iommu->dev; 1975 1976 if (!check_feature(FEATURE_PC)) 1977 return; 1978 1979 amd_iommu_pc_present = true; 1980 1981 pci_info(pdev, "IOMMU performance counters supported\n"); 1982 1983 val = readl(iommu->mmio_base + MMIO_CNTR_CONF_OFFSET); 1984 iommu->max_banks = (u8) ((val >> 12) & 0x3f); 1985 iommu->max_counters = (u8) ((val >> 7) & 0xf); 1986 1987 return; 1988 } 1989 1990 static ssize_t amd_iommu_show_cap(struct device *dev, 1991 struct device_attribute *attr, 1992 char *buf) 1993 { 1994 struct amd_iommu *iommu = dev_to_amd_iommu(dev); 1995 return sysfs_emit(buf, "%x\n", iommu->cap); 1996 } 1997 static DEVICE_ATTR(cap, S_IRUGO, amd_iommu_show_cap, NULL); 1998 1999 static ssize_t amd_iommu_show_features(struct device *dev, 2000 struct device_attribute *attr, 2001 char *buf) 2002 { 2003 return sysfs_emit(buf, "%llx:%llx\n", amd_iommu_efr, amd_iommu_efr2); 2004 } 2005 static DEVICE_ATTR(features, S_IRUGO, amd_iommu_show_features, NULL); 2006 2007 static struct attribute *amd_iommu_attrs[] = { 2008 &dev_attr_cap.attr, 2009 &dev_attr_features.attr, 2010 NULL, 2011 }; 2012 2013 static struct attribute_group amd_iommu_group = { 2014 .name = "amd-iommu", 2015 .attrs = amd_iommu_attrs, 2016 }; 2017 2018 static const struct attribute_group *amd_iommu_groups[] = { 2019 &amd_iommu_group, 2020 NULL, 2021 }; 2022 2023 /* 2024 * Note: IVHD 0x11 and 0x40 also contains exact copy 2025 * of the IOMMU Extended Feature Register [MMIO Offset 0030h]. 2026 * Default to EFR in IVHD since it is available sooner (i.e. before PCI init). 2027 */ 2028 static void __init late_iommu_features_init(struct amd_iommu *iommu) 2029 { 2030 u64 features, features2; 2031 2032 if (!(iommu->cap & (1 << IOMMU_CAP_EFR))) 2033 return; 2034 2035 /* read extended feature bits */ 2036 features = readq(iommu->mmio_base + MMIO_EXT_FEATURES); 2037 features2 = readq(iommu->mmio_base + MMIO_EXT_FEATURES2); 2038 2039 if (!amd_iommu_efr) { 2040 amd_iommu_efr = features; 2041 amd_iommu_efr2 = features2; 2042 return; 2043 } 2044 2045 /* 2046 * Sanity check and warn if EFR values from 2047 * IVHD and MMIO conflict. 2048 */ 2049 if (features != amd_iommu_efr || 2050 features2 != amd_iommu_efr2) { 2051 pr_warn(FW_WARN 2052 "EFR mismatch. Use IVHD EFR (%#llx : %#llx), EFR2 (%#llx : %#llx).\n", 2053 features, amd_iommu_efr, 2054 features2, amd_iommu_efr2); 2055 } 2056 } 2057 2058 static int __init iommu_init_pci(struct amd_iommu *iommu) 2059 { 2060 int cap_ptr = iommu->cap_ptr; 2061 int ret; 2062 2063 iommu->dev = pci_get_domain_bus_and_slot(iommu->pci_seg->id, 2064 PCI_BUS_NUM(iommu->devid), 2065 iommu->devid & 0xff); 2066 if (!iommu->dev) 2067 return -ENODEV; 2068 2069 /* Prevent binding other PCI device drivers to IOMMU devices */ 2070 iommu->dev->match_driver = false; 2071 2072 /* ACPI _PRT won't have an IRQ for IOMMU */ 2073 iommu->dev->irq_managed = 1; 2074 2075 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET, 2076 &iommu->cap); 2077 2078 if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB))) 2079 amd_iommu_iotlb_sup = false; 2080 2081 late_iommu_features_init(iommu); 2082 2083 if (check_feature(FEATURE_GT)) { 2084 int glxval; 2085 u64 pasmax; 2086 2087 pasmax = amd_iommu_efr & FEATURE_PASID_MASK; 2088 pasmax >>= FEATURE_PASID_SHIFT; 2089 iommu->iommu.max_pasids = (1 << (pasmax + 1)) - 1; 2090 2091 BUG_ON(iommu->iommu.max_pasids & ~PASID_MASK); 2092 2093 glxval = amd_iommu_efr & FEATURE_GLXVAL_MASK; 2094 glxval >>= FEATURE_GLXVAL_SHIFT; 2095 2096 if (amd_iommu_max_glx_val == -1) 2097 amd_iommu_max_glx_val = glxval; 2098 else 2099 amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval); 2100 } 2101 2102 if (check_feature(FEATURE_PPR) && alloc_ppr_log(iommu)) 2103 return -ENOMEM; 2104 2105 if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE)) { 2106 pr_info("Using strict mode due to virtualization\n"); 2107 iommu_set_dma_strict(); 2108 amd_iommu_np_cache = true; 2109 } 2110 2111 init_iommu_perf_ctr(iommu); 2112 2113 if (amd_iommu_pgtable == AMD_IOMMU_V2) { 2114 if (!check_feature(FEATURE_GIOSUP) || 2115 !check_feature(FEATURE_GT)) { 2116 pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n"); 2117 amd_iommu_pgtable = AMD_IOMMU_V1; 2118 } 2119 } 2120 2121 if (is_rd890_iommu(iommu->dev)) { 2122 int i, j; 2123 2124 iommu->root_pdev = 2125 pci_get_domain_bus_and_slot(iommu->pci_seg->id, 2126 iommu->dev->bus->number, 2127 PCI_DEVFN(0, 0)); 2128 2129 /* 2130 * Some rd890 systems may not be fully reconfigured by the 2131 * BIOS, so it's necessary for us to store this information so 2132 * it can be reprogrammed on resume 2133 */ 2134 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4, 2135 &iommu->stored_addr_lo); 2136 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8, 2137 &iommu->stored_addr_hi); 2138 2139 /* Low bit locks writes to configuration space */ 2140 iommu->stored_addr_lo &= ~1; 2141 2142 for (i = 0; i < 6; i++) 2143 for (j = 0; j < 0x12; j++) 2144 iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j); 2145 2146 for (i = 0; i < 0x83; i++) 2147 iommu->stored_l2[i] = iommu_read_l2(iommu, i); 2148 } 2149 2150 amd_iommu_erratum_746_workaround(iommu); 2151 amd_iommu_ats_write_check_workaround(iommu); 2152 2153 ret = iommu_device_sysfs_add(&iommu->iommu, &iommu->dev->dev, 2154 amd_iommu_groups, "ivhd%d", iommu->index); 2155 if (ret) 2156 return ret; 2157 2158 iommu_device_register(&iommu->iommu, &amd_iommu_ops, NULL); 2159 2160 return pci_enable_device(iommu->dev); 2161 } 2162 2163 static void print_iommu_info(void) 2164 { 2165 int i; 2166 static const char * const feat_str[] = { 2167 "PreF", "PPR", "X2APIC", "NX", "GT", "[5]", 2168 "IA", "GA", "HE", "PC" 2169 }; 2170 2171 if (amd_iommu_efr) { 2172 pr_info("Extended features (%#llx, %#llx):", amd_iommu_efr, amd_iommu_efr2); 2173 2174 for (i = 0; i < ARRAY_SIZE(feat_str); ++i) { 2175 if (check_feature(1ULL << i)) 2176 pr_cont(" %s", feat_str[i]); 2177 } 2178 2179 if (check_feature(FEATURE_GAM_VAPIC)) 2180 pr_cont(" GA_vAPIC"); 2181 2182 if (check_feature(FEATURE_SNP)) 2183 pr_cont(" SNP"); 2184 2185 pr_cont("\n"); 2186 } 2187 2188 if (irq_remapping_enabled) { 2189 pr_info("Interrupt remapping enabled\n"); 2190 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE) 2191 pr_info("X2APIC enabled\n"); 2192 } 2193 if (amd_iommu_pgtable == AMD_IOMMU_V2) { 2194 pr_info("V2 page table enabled (Paging mode : %d level)\n", 2195 amd_iommu_gpt_level); 2196 } 2197 } 2198 2199 static int __init amd_iommu_init_pci(void) 2200 { 2201 struct amd_iommu *iommu; 2202 struct amd_iommu_pci_seg *pci_seg; 2203 int ret; 2204 2205 for_each_iommu(iommu) { 2206 ret = iommu_init_pci(iommu); 2207 if (ret) { 2208 pr_err("IOMMU%d: Failed to initialize IOMMU Hardware (error=%d)!\n", 2209 iommu->index, ret); 2210 goto out; 2211 } 2212 /* Need to setup range after PCI init */ 2213 iommu_set_cwwb_range(iommu); 2214 } 2215 2216 /* 2217 * Order is important here to make sure any unity map requirements are 2218 * fulfilled. The unity mappings are created and written to the device 2219 * table during the iommu_init_pci() call. 2220 * 2221 * After that we call init_device_table_dma() to make sure any 2222 * uninitialized DTE will block DMA, and in the end we flush the caches 2223 * of all IOMMUs to make sure the changes to the device table are 2224 * active. 2225 */ 2226 for_each_pci_segment(pci_seg) 2227 init_device_table_dma(pci_seg); 2228 2229 for_each_iommu(iommu) 2230 amd_iommu_flush_all_caches(iommu); 2231 2232 print_iommu_info(); 2233 2234 out: 2235 return ret; 2236 } 2237 2238 /**************************************************************************** 2239 * 2240 * The following functions initialize the MSI interrupts for all IOMMUs 2241 * in the system. It's a bit challenging because there could be multiple 2242 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per 2243 * pci_dev. 2244 * 2245 ****************************************************************************/ 2246 2247 static int iommu_setup_msi(struct amd_iommu *iommu) 2248 { 2249 int r; 2250 2251 r = pci_enable_msi(iommu->dev); 2252 if (r) 2253 return r; 2254 2255 r = request_threaded_irq(iommu->dev->irq, 2256 amd_iommu_int_handler, 2257 amd_iommu_int_thread, 2258 0, "AMD-Vi", 2259 iommu); 2260 2261 if (r) { 2262 pci_disable_msi(iommu->dev); 2263 return r; 2264 } 2265 2266 return 0; 2267 } 2268 2269 union intcapxt { 2270 u64 capxt; 2271 struct { 2272 u64 reserved_0 : 2, 2273 dest_mode_logical : 1, 2274 reserved_1 : 5, 2275 destid_0_23 : 24, 2276 vector : 8, 2277 reserved_2 : 16, 2278 destid_24_31 : 8; 2279 }; 2280 } __attribute__ ((packed)); 2281 2282 2283 static struct irq_chip intcapxt_controller; 2284 2285 static int intcapxt_irqdomain_activate(struct irq_domain *domain, 2286 struct irq_data *irqd, bool reserve) 2287 { 2288 return 0; 2289 } 2290 2291 static void intcapxt_irqdomain_deactivate(struct irq_domain *domain, 2292 struct irq_data *irqd) 2293 { 2294 } 2295 2296 2297 static int intcapxt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq, 2298 unsigned int nr_irqs, void *arg) 2299 { 2300 struct irq_alloc_info *info = arg; 2301 int i, ret; 2302 2303 if (!info || info->type != X86_IRQ_ALLOC_TYPE_AMDVI) 2304 return -EINVAL; 2305 2306 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); 2307 if (ret < 0) 2308 return ret; 2309 2310 for (i = virq; i < virq + nr_irqs; i++) { 2311 struct irq_data *irqd = irq_domain_get_irq_data(domain, i); 2312 2313 irqd->chip = &intcapxt_controller; 2314 irqd->hwirq = info->hwirq; 2315 irqd->chip_data = info->data; 2316 __irq_set_handler(i, handle_edge_irq, 0, "edge"); 2317 } 2318 2319 return ret; 2320 } 2321 2322 static void intcapxt_irqdomain_free(struct irq_domain *domain, unsigned int virq, 2323 unsigned int nr_irqs) 2324 { 2325 irq_domain_free_irqs_top(domain, virq, nr_irqs); 2326 } 2327 2328 2329 static void intcapxt_unmask_irq(struct irq_data *irqd) 2330 { 2331 struct amd_iommu *iommu = irqd->chip_data; 2332 struct irq_cfg *cfg = irqd_cfg(irqd); 2333 union intcapxt xt; 2334 2335 xt.capxt = 0ULL; 2336 xt.dest_mode_logical = apic->dest_mode_logical; 2337 xt.vector = cfg->vector; 2338 xt.destid_0_23 = cfg->dest_apicid & GENMASK(23, 0); 2339 xt.destid_24_31 = cfg->dest_apicid >> 24; 2340 2341 writeq(xt.capxt, iommu->mmio_base + irqd->hwirq); 2342 } 2343 2344 static void intcapxt_mask_irq(struct irq_data *irqd) 2345 { 2346 struct amd_iommu *iommu = irqd->chip_data; 2347 2348 writeq(0, iommu->mmio_base + irqd->hwirq); 2349 } 2350 2351 2352 static int intcapxt_set_affinity(struct irq_data *irqd, 2353 const struct cpumask *mask, bool force) 2354 { 2355 struct irq_data *parent = irqd->parent_data; 2356 int ret; 2357 2358 ret = parent->chip->irq_set_affinity(parent, mask, force); 2359 if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE) 2360 return ret; 2361 return 0; 2362 } 2363 2364 static int intcapxt_set_wake(struct irq_data *irqd, unsigned int on) 2365 { 2366 return on ? -EOPNOTSUPP : 0; 2367 } 2368 2369 static struct irq_chip intcapxt_controller = { 2370 .name = "IOMMU-MSI", 2371 .irq_unmask = intcapxt_unmask_irq, 2372 .irq_mask = intcapxt_mask_irq, 2373 .irq_ack = irq_chip_ack_parent, 2374 .irq_retrigger = irq_chip_retrigger_hierarchy, 2375 .irq_set_affinity = intcapxt_set_affinity, 2376 .irq_set_wake = intcapxt_set_wake, 2377 .flags = IRQCHIP_MASK_ON_SUSPEND, 2378 }; 2379 2380 static const struct irq_domain_ops intcapxt_domain_ops = { 2381 .alloc = intcapxt_irqdomain_alloc, 2382 .free = intcapxt_irqdomain_free, 2383 .activate = intcapxt_irqdomain_activate, 2384 .deactivate = intcapxt_irqdomain_deactivate, 2385 }; 2386 2387 2388 static struct irq_domain *iommu_irqdomain; 2389 2390 static struct irq_domain *iommu_get_irqdomain(void) 2391 { 2392 struct fwnode_handle *fn; 2393 2394 /* No need for locking here (yet) as the init is single-threaded */ 2395 if (iommu_irqdomain) 2396 return iommu_irqdomain; 2397 2398 fn = irq_domain_alloc_named_fwnode("AMD-Vi-MSI"); 2399 if (!fn) 2400 return NULL; 2401 2402 iommu_irqdomain = irq_domain_create_hierarchy(x86_vector_domain, 0, 0, 2403 fn, &intcapxt_domain_ops, 2404 NULL); 2405 if (!iommu_irqdomain) 2406 irq_domain_free_fwnode(fn); 2407 2408 return iommu_irqdomain; 2409 } 2410 2411 static int __iommu_setup_intcapxt(struct amd_iommu *iommu, const char *devname, 2412 int hwirq, irq_handler_t thread_fn) 2413 { 2414 struct irq_domain *domain; 2415 struct irq_alloc_info info; 2416 int irq, ret; 2417 int node = dev_to_node(&iommu->dev->dev); 2418 2419 domain = iommu_get_irqdomain(); 2420 if (!domain) 2421 return -ENXIO; 2422 2423 init_irq_alloc_info(&info, NULL); 2424 info.type = X86_IRQ_ALLOC_TYPE_AMDVI; 2425 info.data = iommu; 2426 info.hwirq = hwirq; 2427 2428 irq = irq_domain_alloc_irqs(domain, 1, node, &info); 2429 if (irq < 0) { 2430 irq_domain_remove(domain); 2431 return irq; 2432 } 2433 2434 ret = request_threaded_irq(irq, amd_iommu_int_handler, 2435 thread_fn, 0, devname, iommu); 2436 if (ret) { 2437 irq_domain_free_irqs(irq, 1); 2438 irq_domain_remove(domain); 2439 return ret; 2440 } 2441 2442 return 0; 2443 } 2444 2445 static int iommu_setup_intcapxt(struct amd_iommu *iommu) 2446 { 2447 int ret; 2448 2449 snprintf(iommu->evt_irq_name, sizeof(iommu->evt_irq_name), 2450 "AMD-Vi%d-Evt", iommu->index); 2451 ret = __iommu_setup_intcapxt(iommu, iommu->evt_irq_name, 2452 MMIO_INTCAPXT_EVT_OFFSET, 2453 amd_iommu_int_thread_evtlog); 2454 if (ret) 2455 return ret; 2456 2457 snprintf(iommu->ppr_irq_name, sizeof(iommu->ppr_irq_name), 2458 "AMD-Vi%d-PPR", iommu->index); 2459 ret = __iommu_setup_intcapxt(iommu, iommu->ppr_irq_name, 2460 MMIO_INTCAPXT_PPR_OFFSET, 2461 amd_iommu_int_thread_pprlog); 2462 if (ret) 2463 return ret; 2464 2465 #ifdef CONFIG_IRQ_REMAP 2466 snprintf(iommu->ga_irq_name, sizeof(iommu->ga_irq_name), 2467 "AMD-Vi%d-GA", iommu->index); 2468 ret = __iommu_setup_intcapxt(iommu, iommu->ga_irq_name, 2469 MMIO_INTCAPXT_GALOG_OFFSET, 2470 amd_iommu_int_thread_galog); 2471 #endif 2472 2473 return ret; 2474 } 2475 2476 static int iommu_init_irq(struct amd_iommu *iommu) 2477 { 2478 int ret; 2479 2480 if (iommu->int_enabled) 2481 goto enable_faults; 2482 2483 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE) 2484 ret = iommu_setup_intcapxt(iommu); 2485 else if (iommu->dev->msi_cap) 2486 ret = iommu_setup_msi(iommu); 2487 else 2488 ret = -ENODEV; 2489 2490 if (ret) 2491 return ret; 2492 2493 iommu->int_enabled = true; 2494 enable_faults: 2495 2496 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE) 2497 iommu_feature_enable(iommu, CONTROL_INTCAPXT_EN); 2498 2499 iommu_feature_enable(iommu, CONTROL_EVT_INT_EN); 2500 2501 return 0; 2502 } 2503 2504 /**************************************************************************** 2505 * 2506 * The next functions belong to the third pass of parsing the ACPI 2507 * table. In this last pass the memory mapping requirements are 2508 * gathered (like exclusion and unity mapping ranges). 2509 * 2510 ****************************************************************************/ 2511 2512 static void __init free_unity_maps(void) 2513 { 2514 struct unity_map_entry *entry, *next; 2515 struct amd_iommu_pci_seg *p, *pci_seg; 2516 2517 for_each_pci_segment_safe(pci_seg, p) { 2518 list_for_each_entry_safe(entry, next, &pci_seg->unity_map, list) { 2519 list_del(&entry->list); 2520 kfree(entry); 2521 } 2522 } 2523 } 2524 2525 /* called for unity map ACPI definition */ 2526 static int __init init_unity_map_range(struct ivmd_header *m, 2527 struct acpi_table_header *ivrs_base) 2528 { 2529 struct unity_map_entry *e = NULL; 2530 struct amd_iommu_pci_seg *pci_seg; 2531 char *s; 2532 2533 pci_seg = get_pci_segment(m->pci_seg, ivrs_base); 2534 if (pci_seg == NULL) 2535 return -ENOMEM; 2536 2537 e = kzalloc(sizeof(*e), GFP_KERNEL); 2538 if (e == NULL) 2539 return -ENOMEM; 2540 2541 switch (m->type) { 2542 default: 2543 kfree(e); 2544 return 0; 2545 case ACPI_IVMD_TYPE: 2546 s = "IVMD_TYPEi\t\t\t"; 2547 e->devid_start = e->devid_end = m->devid; 2548 break; 2549 case ACPI_IVMD_TYPE_ALL: 2550 s = "IVMD_TYPE_ALL\t\t"; 2551 e->devid_start = 0; 2552 e->devid_end = pci_seg->last_bdf; 2553 break; 2554 case ACPI_IVMD_TYPE_RANGE: 2555 s = "IVMD_TYPE_RANGE\t\t"; 2556 e->devid_start = m->devid; 2557 e->devid_end = m->aux; 2558 break; 2559 } 2560 e->address_start = PAGE_ALIGN(m->range_start); 2561 e->address_end = e->address_start + PAGE_ALIGN(m->range_length); 2562 e->prot = m->flags >> 1; 2563 2564 /* 2565 * Treat per-device exclusion ranges as r/w unity-mapped regions 2566 * since some buggy BIOSes might lead to the overwritten exclusion 2567 * range (exclusion_start and exclusion_length members). This 2568 * happens when there are multiple exclusion ranges (IVMD entries) 2569 * defined in ACPI table. 2570 */ 2571 if (m->flags & IVMD_FLAG_EXCL_RANGE) 2572 e->prot = (IVMD_FLAG_IW | IVMD_FLAG_IR) >> 1; 2573 2574 DUMP_printk("%s devid_start: %04x:%02x:%02x.%x devid_end: " 2575 "%04x:%02x:%02x.%x range_start: %016llx range_end: %016llx" 2576 " flags: %x\n", s, m->pci_seg, 2577 PCI_BUS_NUM(e->devid_start), PCI_SLOT(e->devid_start), 2578 PCI_FUNC(e->devid_start), m->pci_seg, 2579 PCI_BUS_NUM(e->devid_end), 2580 PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end), 2581 e->address_start, e->address_end, m->flags); 2582 2583 list_add_tail(&e->list, &pci_seg->unity_map); 2584 2585 return 0; 2586 } 2587 2588 /* iterates over all memory definitions we find in the ACPI table */ 2589 static int __init init_memory_definitions(struct acpi_table_header *table) 2590 { 2591 u8 *p = (u8 *)table, *end = (u8 *)table; 2592 struct ivmd_header *m; 2593 2594 end += table->length; 2595 p += IVRS_HEADER_LENGTH; 2596 2597 while (p < end) { 2598 m = (struct ivmd_header *)p; 2599 if (m->flags & (IVMD_FLAG_UNITY_MAP | IVMD_FLAG_EXCL_RANGE)) 2600 init_unity_map_range(m, table); 2601 2602 p += m->length; 2603 } 2604 2605 return 0; 2606 } 2607 2608 /* 2609 * Init the device table to not allow DMA access for devices 2610 */ 2611 static void init_device_table_dma(struct amd_iommu_pci_seg *pci_seg) 2612 { 2613 u32 devid; 2614 struct dev_table_entry *dev_table = pci_seg->dev_table; 2615 2616 if (dev_table == NULL) 2617 return; 2618 2619 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) { 2620 __set_dev_entry_bit(dev_table, devid, DEV_ENTRY_VALID); 2621 if (!amd_iommu_snp_en) 2622 __set_dev_entry_bit(dev_table, devid, DEV_ENTRY_TRANSLATION); 2623 } 2624 } 2625 2626 static void __init uninit_device_table_dma(struct amd_iommu_pci_seg *pci_seg) 2627 { 2628 u32 devid; 2629 struct dev_table_entry *dev_table = pci_seg->dev_table; 2630 2631 if (dev_table == NULL) 2632 return; 2633 2634 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) { 2635 dev_table[devid].data[0] = 0ULL; 2636 dev_table[devid].data[1] = 0ULL; 2637 } 2638 } 2639 2640 static void init_device_table(void) 2641 { 2642 struct amd_iommu_pci_seg *pci_seg; 2643 u32 devid; 2644 2645 if (!amd_iommu_irq_remap) 2646 return; 2647 2648 for_each_pci_segment(pci_seg) { 2649 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) 2650 __set_dev_entry_bit(pci_seg->dev_table, 2651 devid, DEV_ENTRY_IRQ_TBL_EN); 2652 } 2653 } 2654 2655 static void iommu_init_flags(struct amd_iommu *iommu) 2656 { 2657 iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ? 2658 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) : 2659 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN); 2660 2661 iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ? 2662 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) : 2663 iommu_feature_disable(iommu, CONTROL_PASSPW_EN); 2664 2665 iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ? 2666 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) : 2667 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN); 2668 2669 iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ? 2670 iommu_feature_enable(iommu, CONTROL_ISOC_EN) : 2671 iommu_feature_disable(iommu, CONTROL_ISOC_EN); 2672 2673 /* 2674 * make IOMMU memory accesses cache coherent 2675 */ 2676 iommu_feature_enable(iommu, CONTROL_COHERENT_EN); 2677 2678 /* Set IOTLB invalidation timeout to 1s */ 2679 iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S); 2680 } 2681 2682 static void iommu_apply_resume_quirks(struct amd_iommu *iommu) 2683 { 2684 int i, j; 2685 u32 ioc_feature_control; 2686 struct pci_dev *pdev = iommu->root_pdev; 2687 2688 /* RD890 BIOSes may not have completely reconfigured the iommu */ 2689 if (!is_rd890_iommu(iommu->dev) || !pdev) 2690 return; 2691 2692 /* 2693 * First, we need to ensure that the iommu is enabled. This is 2694 * controlled by a register in the northbridge 2695 */ 2696 2697 /* Select Northbridge indirect register 0x75 and enable writing */ 2698 pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7)); 2699 pci_read_config_dword(pdev, 0x64, &ioc_feature_control); 2700 2701 /* Enable the iommu */ 2702 if (!(ioc_feature_control & 0x1)) 2703 pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1); 2704 2705 /* Restore the iommu BAR */ 2706 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4, 2707 iommu->stored_addr_lo); 2708 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8, 2709 iommu->stored_addr_hi); 2710 2711 /* Restore the l1 indirect regs for each of the 6 l1s */ 2712 for (i = 0; i < 6; i++) 2713 for (j = 0; j < 0x12; j++) 2714 iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]); 2715 2716 /* Restore the l2 indirect regs */ 2717 for (i = 0; i < 0x83; i++) 2718 iommu_write_l2(iommu, i, iommu->stored_l2[i]); 2719 2720 /* Lock PCI setup registers */ 2721 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4, 2722 iommu->stored_addr_lo | 1); 2723 } 2724 2725 static void iommu_enable_ga(struct amd_iommu *iommu) 2726 { 2727 #ifdef CONFIG_IRQ_REMAP 2728 switch (amd_iommu_guest_ir) { 2729 case AMD_IOMMU_GUEST_IR_VAPIC: 2730 case AMD_IOMMU_GUEST_IR_LEGACY_GA: 2731 iommu_feature_enable(iommu, CONTROL_GA_EN); 2732 iommu->irte_ops = &irte_128_ops; 2733 break; 2734 default: 2735 iommu->irte_ops = &irte_32_ops; 2736 break; 2737 } 2738 #endif 2739 } 2740 2741 static void iommu_disable_irtcachedis(struct amd_iommu *iommu) 2742 { 2743 iommu_feature_disable(iommu, CONTROL_IRTCACHEDIS); 2744 } 2745 2746 static void iommu_enable_irtcachedis(struct amd_iommu *iommu) 2747 { 2748 u64 ctrl; 2749 2750 if (!amd_iommu_irtcachedis) 2751 return; 2752 2753 /* 2754 * Note: 2755 * The support for IRTCacheDis feature is dertermined by 2756 * checking if the bit is writable. 2757 */ 2758 iommu_feature_enable(iommu, CONTROL_IRTCACHEDIS); 2759 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET); 2760 ctrl &= (1ULL << CONTROL_IRTCACHEDIS); 2761 if (ctrl) 2762 iommu->irtcachedis_enabled = true; 2763 pr_info("iommu%d (%#06x) : IRT cache is %s\n", 2764 iommu->index, iommu->devid, 2765 iommu->irtcachedis_enabled ? "disabled" : "enabled"); 2766 } 2767 2768 static void early_enable_iommu(struct amd_iommu *iommu) 2769 { 2770 iommu_disable(iommu); 2771 iommu_init_flags(iommu); 2772 iommu_set_device_table(iommu); 2773 iommu_enable_command_buffer(iommu); 2774 iommu_enable_event_buffer(iommu); 2775 iommu_set_exclusion_range(iommu); 2776 iommu_enable_gt(iommu); 2777 iommu_enable_ga(iommu); 2778 iommu_enable_xt(iommu); 2779 iommu_enable_irtcachedis(iommu); 2780 iommu_enable(iommu); 2781 amd_iommu_flush_all_caches(iommu); 2782 } 2783 2784 /* 2785 * This function finally enables all IOMMUs found in the system after 2786 * they have been initialized. 2787 * 2788 * Or if in kdump kernel and IOMMUs are all pre-enabled, try to copy 2789 * the old content of device table entries. Not this case or copy failed, 2790 * just continue as normal kernel does. 2791 */ 2792 static void early_enable_iommus(void) 2793 { 2794 struct amd_iommu *iommu; 2795 struct amd_iommu_pci_seg *pci_seg; 2796 2797 if (!copy_device_table()) { 2798 /* 2799 * If come here because of failure in copying device table from old 2800 * kernel with all IOMMUs enabled, print error message and try to 2801 * free allocated old_dev_tbl_cpy. 2802 */ 2803 if (amd_iommu_pre_enabled) 2804 pr_err("Failed to copy DEV table from previous kernel.\n"); 2805 2806 for_each_pci_segment(pci_seg) { 2807 if (pci_seg->old_dev_tbl_cpy != NULL) { 2808 free_pages((unsigned long)pci_seg->old_dev_tbl_cpy, 2809 get_order(pci_seg->dev_table_size)); 2810 pci_seg->old_dev_tbl_cpy = NULL; 2811 } 2812 } 2813 2814 for_each_iommu(iommu) { 2815 clear_translation_pre_enabled(iommu); 2816 early_enable_iommu(iommu); 2817 } 2818 } else { 2819 pr_info("Copied DEV table from previous kernel.\n"); 2820 2821 for_each_pci_segment(pci_seg) { 2822 free_pages((unsigned long)pci_seg->dev_table, 2823 get_order(pci_seg->dev_table_size)); 2824 pci_seg->dev_table = pci_seg->old_dev_tbl_cpy; 2825 } 2826 2827 for_each_iommu(iommu) { 2828 iommu_disable_command_buffer(iommu); 2829 iommu_disable_event_buffer(iommu); 2830 iommu_disable_irtcachedis(iommu); 2831 iommu_enable_command_buffer(iommu); 2832 iommu_enable_event_buffer(iommu); 2833 iommu_enable_gt(iommu); 2834 iommu_enable_ga(iommu); 2835 iommu_enable_xt(iommu); 2836 iommu_enable_irtcachedis(iommu); 2837 iommu_set_device_table(iommu); 2838 amd_iommu_flush_all_caches(iommu); 2839 } 2840 } 2841 } 2842 2843 static void enable_iommus_v2(void) 2844 { 2845 struct amd_iommu *iommu; 2846 2847 for_each_iommu(iommu) 2848 iommu_enable_ppr_log(iommu); 2849 } 2850 2851 static void enable_iommus_vapic(void) 2852 { 2853 #ifdef CONFIG_IRQ_REMAP 2854 u32 status, i; 2855 struct amd_iommu *iommu; 2856 2857 for_each_iommu(iommu) { 2858 /* 2859 * Disable GALog if already running. It could have been enabled 2860 * in the previous boot before kdump. 2861 */ 2862 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); 2863 if (!(status & MMIO_STATUS_GALOG_RUN_MASK)) 2864 continue; 2865 2866 iommu_feature_disable(iommu, CONTROL_GALOG_EN); 2867 iommu_feature_disable(iommu, CONTROL_GAINT_EN); 2868 2869 /* 2870 * Need to set and poll check the GALOGRun bit to zero before 2871 * we can set/ modify GA Log registers safely. 2872 */ 2873 for (i = 0; i < MMIO_STATUS_TIMEOUT; ++i) { 2874 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); 2875 if (!(status & MMIO_STATUS_GALOG_RUN_MASK)) 2876 break; 2877 udelay(10); 2878 } 2879 2880 if (WARN_ON(i >= MMIO_STATUS_TIMEOUT)) 2881 return; 2882 } 2883 2884 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) && 2885 !check_feature(FEATURE_GAM_VAPIC)) { 2886 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA; 2887 return; 2888 } 2889 2890 if (amd_iommu_snp_en && 2891 !FEATURE_SNPAVICSUP_GAM(amd_iommu_efr2)) { 2892 pr_warn("Force to disable Virtual APIC due to SNP\n"); 2893 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA; 2894 return; 2895 } 2896 2897 /* Enabling GAM and SNPAVIC support */ 2898 for_each_iommu(iommu) { 2899 if (iommu_init_ga_log(iommu) || 2900 iommu_ga_log_enable(iommu)) 2901 return; 2902 2903 iommu_feature_enable(iommu, CONTROL_GAM_EN); 2904 if (amd_iommu_snp_en) 2905 iommu_feature_enable(iommu, CONTROL_SNPAVIC_EN); 2906 } 2907 2908 amd_iommu_irq_ops.capability |= (1 << IRQ_POSTING_CAP); 2909 pr_info("Virtual APIC enabled\n"); 2910 #endif 2911 } 2912 2913 static void enable_iommus(void) 2914 { 2915 early_enable_iommus(); 2916 } 2917 2918 static void disable_iommus(void) 2919 { 2920 struct amd_iommu *iommu; 2921 2922 for_each_iommu(iommu) 2923 iommu_disable(iommu); 2924 2925 #ifdef CONFIG_IRQ_REMAP 2926 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) 2927 amd_iommu_irq_ops.capability &= ~(1 << IRQ_POSTING_CAP); 2928 #endif 2929 } 2930 2931 /* 2932 * Suspend/Resume support 2933 * disable suspend until real resume implemented 2934 */ 2935 2936 static void amd_iommu_resume(void) 2937 { 2938 struct amd_iommu *iommu; 2939 2940 for_each_iommu(iommu) 2941 iommu_apply_resume_quirks(iommu); 2942 2943 /* re-load the hardware */ 2944 enable_iommus(); 2945 2946 amd_iommu_enable_interrupts(); 2947 } 2948 2949 static int amd_iommu_suspend(void) 2950 { 2951 /* disable IOMMUs to go out of the way for BIOS */ 2952 disable_iommus(); 2953 2954 return 0; 2955 } 2956 2957 static struct syscore_ops amd_iommu_syscore_ops = { 2958 .suspend = amd_iommu_suspend, 2959 .resume = amd_iommu_resume, 2960 }; 2961 2962 static void __init free_iommu_resources(void) 2963 { 2964 kmem_cache_destroy(amd_iommu_irq_cache); 2965 amd_iommu_irq_cache = NULL; 2966 2967 free_iommu_all(); 2968 free_pci_segments(); 2969 } 2970 2971 /* SB IOAPIC is always on this device in AMD systems */ 2972 #define IOAPIC_SB_DEVID ((0x00 << 8) | PCI_DEVFN(0x14, 0)) 2973 2974 static bool __init check_ioapic_information(void) 2975 { 2976 const char *fw_bug = FW_BUG; 2977 bool ret, has_sb_ioapic; 2978 int idx; 2979 2980 has_sb_ioapic = false; 2981 ret = false; 2982 2983 /* 2984 * If we have map overrides on the kernel command line the 2985 * messages in this function might not describe firmware bugs 2986 * anymore - so be careful 2987 */ 2988 if (cmdline_maps) 2989 fw_bug = ""; 2990 2991 for (idx = 0; idx < nr_ioapics; idx++) { 2992 int devid, id = mpc_ioapic_id(idx); 2993 2994 devid = get_ioapic_devid(id); 2995 if (devid < 0) { 2996 pr_err("%s: IOAPIC[%d] not in IVRS table\n", 2997 fw_bug, id); 2998 ret = false; 2999 } else if (devid == IOAPIC_SB_DEVID) { 3000 has_sb_ioapic = true; 3001 ret = true; 3002 } 3003 } 3004 3005 if (!has_sb_ioapic) { 3006 /* 3007 * We expect the SB IOAPIC to be listed in the IVRS 3008 * table. The system timer is connected to the SB IOAPIC 3009 * and if we don't have it in the list the system will 3010 * panic at boot time. This situation usually happens 3011 * when the BIOS is buggy and provides us the wrong 3012 * device id for the IOAPIC in the system. 3013 */ 3014 pr_err("%s: No southbridge IOAPIC found\n", fw_bug); 3015 } 3016 3017 if (!ret) 3018 pr_err("Disabling interrupt remapping\n"); 3019 3020 return ret; 3021 } 3022 3023 static void __init free_dma_resources(void) 3024 { 3025 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap, 3026 get_order(MAX_DOMAIN_ID/8)); 3027 amd_iommu_pd_alloc_bitmap = NULL; 3028 3029 free_unity_maps(); 3030 } 3031 3032 static void __init ivinfo_init(void *ivrs) 3033 { 3034 amd_iommu_ivinfo = *((u32 *)(ivrs + IOMMU_IVINFO_OFFSET)); 3035 } 3036 3037 /* 3038 * This is the hardware init function for AMD IOMMU in the system. 3039 * This function is called either from amd_iommu_init or from the interrupt 3040 * remapping setup code. 3041 * 3042 * This function basically parses the ACPI table for AMD IOMMU (IVRS) 3043 * four times: 3044 * 3045 * 1 pass) Discover the most comprehensive IVHD type to use. 3046 * 3047 * 2 pass) Find the highest PCI device id the driver has to handle. 3048 * Upon this information the size of the data structures is 3049 * determined that needs to be allocated. 3050 * 3051 * 3 pass) Initialize the data structures just allocated with the 3052 * information in the ACPI table about available AMD IOMMUs 3053 * in the system. It also maps the PCI devices in the 3054 * system to specific IOMMUs 3055 * 3056 * 4 pass) After the basic data structures are allocated and 3057 * initialized we update them with information about memory 3058 * remapping requirements parsed out of the ACPI table in 3059 * this last pass. 3060 * 3061 * After everything is set up the IOMMUs are enabled and the necessary 3062 * hotplug and suspend notifiers are registered. 3063 */ 3064 static int __init early_amd_iommu_init(void) 3065 { 3066 struct acpi_table_header *ivrs_base; 3067 int remap_cache_sz, ret; 3068 acpi_status status; 3069 3070 if (!amd_iommu_detected) 3071 return -ENODEV; 3072 3073 status = acpi_get_table("IVRS", 0, &ivrs_base); 3074 if (status == AE_NOT_FOUND) 3075 return -ENODEV; 3076 else if (ACPI_FAILURE(status)) { 3077 const char *err = acpi_format_exception(status); 3078 pr_err("IVRS table error: %s\n", err); 3079 return -EINVAL; 3080 } 3081 3082 /* 3083 * Validate checksum here so we don't need to do it when 3084 * we actually parse the table 3085 */ 3086 ret = check_ivrs_checksum(ivrs_base); 3087 if (ret) 3088 goto out; 3089 3090 ivinfo_init(ivrs_base); 3091 3092 amd_iommu_target_ivhd_type = get_highest_supported_ivhd_type(ivrs_base); 3093 DUMP_printk("Using IVHD type %#x\n", amd_iommu_target_ivhd_type); 3094 3095 /* Device table - directly used by all IOMMUs */ 3096 ret = -ENOMEM; 3097 3098 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages( 3099 GFP_KERNEL | __GFP_ZERO, 3100 get_order(MAX_DOMAIN_ID/8)); 3101 if (amd_iommu_pd_alloc_bitmap == NULL) 3102 goto out; 3103 3104 /* 3105 * never allocate domain 0 because its used as the non-allocated and 3106 * error value placeholder 3107 */ 3108 __set_bit(0, amd_iommu_pd_alloc_bitmap); 3109 3110 /* 3111 * now the data structures are allocated and basically initialized 3112 * start the real acpi table scan 3113 */ 3114 ret = init_iommu_all(ivrs_base); 3115 if (ret) 3116 goto out; 3117 3118 /* 5 level guest page table */ 3119 if (cpu_feature_enabled(X86_FEATURE_LA57) && 3120 check_feature_gpt_level() == GUEST_PGTABLE_5_LEVEL) 3121 amd_iommu_gpt_level = PAGE_MODE_5_LEVEL; 3122 3123 /* Disable any previously enabled IOMMUs */ 3124 if (!is_kdump_kernel() || amd_iommu_disabled) 3125 disable_iommus(); 3126 3127 if (amd_iommu_irq_remap) 3128 amd_iommu_irq_remap = check_ioapic_information(); 3129 3130 if (amd_iommu_irq_remap) { 3131 struct amd_iommu_pci_seg *pci_seg; 3132 /* 3133 * Interrupt remapping enabled, create kmem_cache for the 3134 * remapping tables. 3135 */ 3136 ret = -ENOMEM; 3137 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir)) 3138 remap_cache_sz = MAX_IRQS_PER_TABLE * sizeof(u32); 3139 else 3140 remap_cache_sz = MAX_IRQS_PER_TABLE * (sizeof(u64) * 2); 3141 amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache", 3142 remap_cache_sz, 3143 DTE_INTTAB_ALIGNMENT, 3144 0, NULL); 3145 if (!amd_iommu_irq_cache) 3146 goto out; 3147 3148 for_each_pci_segment(pci_seg) { 3149 if (alloc_irq_lookup_table(pci_seg)) 3150 goto out; 3151 } 3152 } 3153 3154 ret = init_memory_definitions(ivrs_base); 3155 if (ret) 3156 goto out; 3157 3158 /* init the device table */ 3159 init_device_table(); 3160 3161 out: 3162 /* Don't leak any ACPI memory */ 3163 acpi_put_table(ivrs_base); 3164 3165 return ret; 3166 } 3167 3168 static int amd_iommu_enable_interrupts(void) 3169 { 3170 struct amd_iommu *iommu; 3171 int ret = 0; 3172 3173 for_each_iommu(iommu) { 3174 ret = iommu_init_irq(iommu); 3175 if (ret) 3176 goto out; 3177 } 3178 3179 /* 3180 * Interrupt handler is ready to process interrupts. Enable 3181 * PPR and GA log interrupt for all IOMMUs. 3182 */ 3183 enable_iommus_vapic(); 3184 enable_iommus_v2(); 3185 3186 out: 3187 return ret; 3188 } 3189 3190 static bool __init detect_ivrs(void) 3191 { 3192 struct acpi_table_header *ivrs_base; 3193 acpi_status status; 3194 int i; 3195 3196 status = acpi_get_table("IVRS", 0, &ivrs_base); 3197 if (status == AE_NOT_FOUND) 3198 return false; 3199 else if (ACPI_FAILURE(status)) { 3200 const char *err = acpi_format_exception(status); 3201 pr_err("IVRS table error: %s\n", err); 3202 return false; 3203 } 3204 3205 acpi_put_table(ivrs_base); 3206 3207 if (amd_iommu_force_enable) 3208 goto out; 3209 3210 /* Don't use IOMMU if there is Stoney Ridge graphics */ 3211 for (i = 0; i < 32; i++) { 3212 u32 pci_id; 3213 3214 pci_id = read_pci_config(0, i, 0, 0); 3215 if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) { 3216 pr_info("Disable IOMMU on Stoney Ridge\n"); 3217 return false; 3218 } 3219 } 3220 3221 out: 3222 /* Make sure ACS will be enabled during PCI probe */ 3223 pci_request_acs(); 3224 3225 return true; 3226 } 3227 3228 static void iommu_snp_enable(void) 3229 { 3230 #ifdef CONFIG_KVM_AMD_SEV 3231 if (!cc_platform_has(CC_ATTR_HOST_SEV_SNP)) 3232 return; 3233 /* 3234 * The SNP support requires that IOMMU must be enabled, and is 3235 * configured with V1 page table (DTE[Mode] = 0 is not supported). 3236 */ 3237 if (no_iommu || iommu_default_passthrough()) { 3238 pr_warn("SNP: IOMMU disabled or configured in passthrough mode, SNP cannot be supported.\n"); 3239 goto disable_snp; 3240 } 3241 3242 if (amd_iommu_pgtable != AMD_IOMMU_V1) { 3243 pr_warn("SNP: IOMMU is configured with V2 page table mode, SNP cannot be supported.\n"); 3244 goto disable_snp; 3245 } 3246 3247 amd_iommu_snp_en = check_feature(FEATURE_SNP); 3248 if (!amd_iommu_snp_en) { 3249 pr_warn("SNP: IOMMU SNP feature not enabled, SNP cannot be supported.\n"); 3250 goto disable_snp; 3251 } 3252 3253 pr_info("IOMMU SNP support enabled.\n"); 3254 return; 3255 3256 disable_snp: 3257 cc_platform_clear(CC_ATTR_HOST_SEV_SNP); 3258 #endif 3259 } 3260 3261 /**************************************************************************** 3262 * 3263 * AMD IOMMU Initialization State Machine 3264 * 3265 ****************************************************************************/ 3266 3267 static int __init state_next(void) 3268 { 3269 int ret = 0; 3270 3271 switch (init_state) { 3272 case IOMMU_START_STATE: 3273 if (!detect_ivrs()) { 3274 init_state = IOMMU_NOT_FOUND; 3275 ret = -ENODEV; 3276 } else { 3277 init_state = IOMMU_IVRS_DETECTED; 3278 } 3279 break; 3280 case IOMMU_IVRS_DETECTED: 3281 if (amd_iommu_disabled) { 3282 init_state = IOMMU_CMDLINE_DISABLED; 3283 ret = -EINVAL; 3284 } else { 3285 ret = early_amd_iommu_init(); 3286 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED; 3287 } 3288 break; 3289 case IOMMU_ACPI_FINISHED: 3290 early_enable_iommus(); 3291 x86_platform.iommu_shutdown = disable_iommus; 3292 init_state = IOMMU_ENABLED; 3293 break; 3294 case IOMMU_ENABLED: 3295 register_syscore_ops(&amd_iommu_syscore_ops); 3296 iommu_snp_enable(); 3297 ret = amd_iommu_init_pci(); 3298 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_PCI_INIT; 3299 break; 3300 case IOMMU_PCI_INIT: 3301 ret = amd_iommu_enable_interrupts(); 3302 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_INTERRUPTS_EN; 3303 break; 3304 case IOMMU_INTERRUPTS_EN: 3305 init_state = IOMMU_INITIALIZED; 3306 break; 3307 case IOMMU_INITIALIZED: 3308 /* Nothing to do */ 3309 break; 3310 case IOMMU_NOT_FOUND: 3311 case IOMMU_INIT_ERROR: 3312 case IOMMU_CMDLINE_DISABLED: 3313 /* Error states => do nothing */ 3314 ret = -EINVAL; 3315 break; 3316 default: 3317 /* Unknown state */ 3318 BUG(); 3319 } 3320 3321 if (ret) { 3322 free_dma_resources(); 3323 if (!irq_remapping_enabled) { 3324 disable_iommus(); 3325 free_iommu_resources(); 3326 } else { 3327 struct amd_iommu *iommu; 3328 struct amd_iommu_pci_seg *pci_seg; 3329 3330 for_each_pci_segment(pci_seg) 3331 uninit_device_table_dma(pci_seg); 3332 3333 for_each_iommu(iommu) 3334 amd_iommu_flush_all_caches(iommu); 3335 } 3336 } 3337 return ret; 3338 } 3339 3340 static int __init iommu_go_to_state(enum iommu_init_state state) 3341 { 3342 int ret = -EINVAL; 3343 3344 while (init_state != state) { 3345 if (init_state == IOMMU_NOT_FOUND || 3346 init_state == IOMMU_INIT_ERROR || 3347 init_state == IOMMU_CMDLINE_DISABLED) 3348 break; 3349 ret = state_next(); 3350 } 3351 3352 return ret; 3353 } 3354 3355 #ifdef CONFIG_IRQ_REMAP 3356 int __init amd_iommu_prepare(void) 3357 { 3358 int ret; 3359 3360 amd_iommu_irq_remap = true; 3361 3362 ret = iommu_go_to_state(IOMMU_ACPI_FINISHED); 3363 if (ret) { 3364 amd_iommu_irq_remap = false; 3365 return ret; 3366 } 3367 3368 return amd_iommu_irq_remap ? 0 : -ENODEV; 3369 } 3370 3371 int __init amd_iommu_enable(void) 3372 { 3373 int ret; 3374 3375 ret = iommu_go_to_state(IOMMU_ENABLED); 3376 if (ret) 3377 return ret; 3378 3379 irq_remapping_enabled = 1; 3380 return amd_iommu_xt_mode; 3381 } 3382 3383 void amd_iommu_disable(void) 3384 { 3385 amd_iommu_suspend(); 3386 } 3387 3388 int amd_iommu_reenable(int mode) 3389 { 3390 amd_iommu_resume(); 3391 3392 return 0; 3393 } 3394 3395 int __init amd_iommu_enable_faulting(void) 3396 { 3397 /* We enable MSI later when PCI is initialized */ 3398 return 0; 3399 } 3400 #endif 3401 3402 /* 3403 * This is the core init function for AMD IOMMU hardware in the system. 3404 * This function is called from the generic x86 DMA layer initialization 3405 * code. 3406 */ 3407 static int __init amd_iommu_init(void) 3408 { 3409 struct amd_iommu *iommu; 3410 int ret; 3411 3412 ret = iommu_go_to_state(IOMMU_INITIALIZED); 3413 #ifdef CONFIG_GART_IOMMU 3414 if (ret && list_empty(&amd_iommu_list)) { 3415 /* 3416 * We failed to initialize the AMD IOMMU - try fallback 3417 * to GART if possible. 3418 */ 3419 gart_iommu_init(); 3420 } 3421 #endif 3422 3423 for_each_iommu(iommu) 3424 amd_iommu_debugfs_setup(iommu); 3425 3426 return ret; 3427 } 3428 3429 static bool amd_iommu_sme_check(void) 3430 { 3431 if (!cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT) || 3432 (boot_cpu_data.x86 != 0x17)) 3433 return true; 3434 3435 /* For Fam17h, a specific level of support is required */ 3436 if (boot_cpu_data.microcode >= 0x08001205) 3437 return true; 3438 3439 if ((boot_cpu_data.microcode >= 0x08001126) && 3440 (boot_cpu_data.microcode <= 0x080011ff)) 3441 return true; 3442 3443 pr_notice("IOMMU not currently supported when SME is active\n"); 3444 3445 return false; 3446 } 3447 3448 /**************************************************************************** 3449 * 3450 * Early detect code. This code runs at IOMMU detection time in the DMA 3451 * layer. It just looks if there is an IVRS ACPI table to detect AMD 3452 * IOMMUs 3453 * 3454 ****************************************************************************/ 3455 int __init amd_iommu_detect(void) 3456 { 3457 int ret; 3458 3459 if (no_iommu || (iommu_detected && !gart_iommu_aperture)) 3460 return -ENODEV; 3461 3462 if (!amd_iommu_sme_check()) 3463 return -ENODEV; 3464 3465 ret = iommu_go_to_state(IOMMU_IVRS_DETECTED); 3466 if (ret) 3467 return ret; 3468 3469 amd_iommu_detected = true; 3470 iommu_detected = 1; 3471 x86_init.iommu.iommu_init = amd_iommu_init; 3472 3473 return 1; 3474 } 3475 3476 /**************************************************************************** 3477 * 3478 * Parsing functions for the AMD IOMMU specific kernel command line 3479 * options. 3480 * 3481 ****************************************************************************/ 3482 3483 static int __init parse_amd_iommu_dump(char *str) 3484 { 3485 amd_iommu_dump = true; 3486 3487 return 1; 3488 } 3489 3490 static int __init parse_amd_iommu_intr(char *str) 3491 { 3492 for (; *str; ++str) { 3493 if (strncmp(str, "legacy", 6) == 0) { 3494 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA; 3495 break; 3496 } 3497 if (strncmp(str, "vapic", 5) == 0) { 3498 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC; 3499 break; 3500 } 3501 } 3502 return 1; 3503 } 3504 3505 static int __init parse_amd_iommu_options(char *str) 3506 { 3507 if (!str) 3508 return -EINVAL; 3509 3510 while (*str) { 3511 if (strncmp(str, "fullflush", 9) == 0) { 3512 pr_warn("amd_iommu=fullflush deprecated; use iommu.strict=1 instead\n"); 3513 iommu_set_dma_strict(); 3514 } else if (strncmp(str, "force_enable", 12) == 0) { 3515 amd_iommu_force_enable = true; 3516 } else if (strncmp(str, "off", 3) == 0) { 3517 amd_iommu_disabled = true; 3518 } else if (strncmp(str, "force_isolation", 15) == 0) { 3519 amd_iommu_force_isolation = true; 3520 } else if (strncmp(str, "pgtbl_v1", 8) == 0) { 3521 amd_iommu_pgtable = AMD_IOMMU_V1; 3522 } else if (strncmp(str, "pgtbl_v2", 8) == 0) { 3523 amd_iommu_pgtable = AMD_IOMMU_V2; 3524 } else if (strncmp(str, "irtcachedis", 11) == 0) { 3525 amd_iommu_irtcachedis = true; 3526 } else { 3527 pr_notice("Unknown option - '%s'\n", str); 3528 } 3529 3530 str += strcspn(str, ","); 3531 while (*str == ',') 3532 str++; 3533 } 3534 3535 return 1; 3536 } 3537 3538 static int __init parse_ivrs_ioapic(char *str) 3539 { 3540 u32 seg = 0, bus, dev, fn; 3541 int id, i; 3542 u32 devid; 3543 3544 if (sscanf(str, "=%d@%x:%x.%x", &id, &bus, &dev, &fn) == 4 || 3545 sscanf(str, "=%d@%x:%x:%x.%x", &id, &seg, &bus, &dev, &fn) == 5) 3546 goto found; 3547 3548 if (sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn) == 4 || 3549 sscanf(str, "[%d]=%x:%x:%x.%x", &id, &seg, &bus, &dev, &fn) == 5) { 3550 pr_warn("ivrs_ioapic%s option format deprecated; use ivrs_ioapic=%d@%04x:%02x:%02x.%d instead\n", 3551 str, id, seg, bus, dev, fn); 3552 goto found; 3553 } 3554 3555 pr_err("Invalid command line: ivrs_ioapic%s\n", str); 3556 return 1; 3557 3558 found: 3559 if (early_ioapic_map_size == EARLY_MAP_SIZE) { 3560 pr_err("Early IOAPIC map overflow - ignoring ivrs_ioapic%s\n", 3561 str); 3562 return 1; 3563 } 3564 3565 devid = IVRS_GET_SBDF_ID(seg, bus, dev, fn); 3566 3567 cmdline_maps = true; 3568 i = early_ioapic_map_size++; 3569 early_ioapic_map[i].id = id; 3570 early_ioapic_map[i].devid = devid; 3571 early_ioapic_map[i].cmd_line = true; 3572 3573 return 1; 3574 } 3575 3576 static int __init parse_ivrs_hpet(char *str) 3577 { 3578 u32 seg = 0, bus, dev, fn; 3579 int id, i; 3580 u32 devid; 3581 3582 if (sscanf(str, "=%d@%x:%x.%x", &id, &bus, &dev, &fn) == 4 || 3583 sscanf(str, "=%d@%x:%x:%x.%x", &id, &seg, &bus, &dev, &fn) == 5) 3584 goto found; 3585 3586 if (sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn) == 4 || 3587 sscanf(str, "[%d]=%x:%x:%x.%x", &id, &seg, &bus, &dev, &fn) == 5) { 3588 pr_warn("ivrs_hpet%s option format deprecated; use ivrs_hpet=%d@%04x:%02x:%02x.%d instead\n", 3589 str, id, seg, bus, dev, fn); 3590 goto found; 3591 } 3592 3593 pr_err("Invalid command line: ivrs_hpet%s\n", str); 3594 return 1; 3595 3596 found: 3597 if (early_hpet_map_size == EARLY_MAP_SIZE) { 3598 pr_err("Early HPET map overflow - ignoring ivrs_hpet%s\n", 3599 str); 3600 return 1; 3601 } 3602 3603 devid = IVRS_GET_SBDF_ID(seg, bus, dev, fn); 3604 3605 cmdline_maps = true; 3606 i = early_hpet_map_size++; 3607 early_hpet_map[i].id = id; 3608 early_hpet_map[i].devid = devid; 3609 early_hpet_map[i].cmd_line = true; 3610 3611 return 1; 3612 } 3613 3614 #define ACPIID_LEN (ACPIHID_UID_LEN + ACPIHID_HID_LEN) 3615 3616 static int __init parse_ivrs_acpihid(char *str) 3617 { 3618 u32 seg = 0, bus, dev, fn; 3619 char *hid, *uid, *p, *addr; 3620 char acpiid[ACPIID_LEN] = {0}; 3621 int i; 3622 3623 addr = strchr(str, '@'); 3624 if (!addr) { 3625 addr = strchr(str, '='); 3626 if (!addr) 3627 goto not_found; 3628 3629 ++addr; 3630 3631 if (strlen(addr) > ACPIID_LEN) 3632 goto not_found; 3633 3634 if (sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid) == 4 || 3635 sscanf(str, "[%x:%x:%x.%x]=%s", &seg, &bus, &dev, &fn, acpiid) == 5) { 3636 pr_warn("ivrs_acpihid%s option format deprecated; use ivrs_acpihid=%s@%04x:%02x:%02x.%d instead\n", 3637 str, acpiid, seg, bus, dev, fn); 3638 goto found; 3639 } 3640 goto not_found; 3641 } 3642 3643 /* We have the '@', make it the terminator to get just the acpiid */ 3644 *addr++ = 0; 3645 3646 if (strlen(str) > ACPIID_LEN + 1) 3647 goto not_found; 3648 3649 if (sscanf(str, "=%s", acpiid) != 1) 3650 goto not_found; 3651 3652 if (sscanf(addr, "%x:%x.%x", &bus, &dev, &fn) == 3 || 3653 sscanf(addr, "%x:%x:%x.%x", &seg, &bus, &dev, &fn) == 4) 3654 goto found; 3655 3656 not_found: 3657 pr_err("Invalid command line: ivrs_acpihid%s\n", str); 3658 return 1; 3659 3660 found: 3661 p = acpiid; 3662 hid = strsep(&p, ":"); 3663 uid = p; 3664 3665 if (!hid || !(*hid) || !uid) { 3666 pr_err("Invalid command line: hid or uid\n"); 3667 return 1; 3668 } 3669 3670 /* 3671 * Ignore leading zeroes after ':', so e.g., AMDI0095:00 3672 * will match AMDI0095:0 in the second strcmp in acpi_dev_hid_uid_match 3673 */ 3674 while (*uid == '0' && *(uid + 1)) 3675 uid++; 3676 3677 i = early_acpihid_map_size++; 3678 memcpy(early_acpihid_map[i].hid, hid, strlen(hid)); 3679 memcpy(early_acpihid_map[i].uid, uid, strlen(uid)); 3680 early_acpihid_map[i].devid = IVRS_GET_SBDF_ID(seg, bus, dev, fn); 3681 early_acpihid_map[i].cmd_line = true; 3682 3683 return 1; 3684 } 3685 3686 __setup("amd_iommu_dump", parse_amd_iommu_dump); 3687 __setup("amd_iommu=", parse_amd_iommu_options); 3688 __setup("amd_iommu_intr=", parse_amd_iommu_intr); 3689 __setup("ivrs_ioapic", parse_ivrs_ioapic); 3690 __setup("ivrs_hpet", parse_ivrs_hpet); 3691 __setup("ivrs_acpihid", parse_ivrs_acpihid); 3692 3693 bool amd_iommu_v2_supported(void) 3694 { 3695 /* CPU page table size should match IOMMU guest page table size */ 3696 if (cpu_feature_enabled(X86_FEATURE_LA57) && 3697 amd_iommu_gpt_level != PAGE_MODE_5_LEVEL) 3698 return false; 3699 3700 /* 3701 * Since DTE[Mode]=0 is prohibited on SNP-enabled system 3702 * (i.e. EFR[SNPSup]=1), IOMMUv2 page table cannot be used without 3703 * setting up IOMMUv1 page table. 3704 */ 3705 return amd_iommu_gt_ppr_supported() && !amd_iommu_snp_en; 3706 } 3707 3708 struct amd_iommu *get_amd_iommu(unsigned int idx) 3709 { 3710 unsigned int i = 0; 3711 struct amd_iommu *iommu; 3712 3713 for_each_iommu(iommu) 3714 if (i++ == idx) 3715 return iommu; 3716 return NULL; 3717 } 3718 3719 /**************************************************************************** 3720 * 3721 * IOMMU EFR Performance Counter support functionality. This code allows 3722 * access to the IOMMU PC functionality. 3723 * 3724 ****************************************************************************/ 3725 3726 u8 amd_iommu_pc_get_max_banks(unsigned int idx) 3727 { 3728 struct amd_iommu *iommu = get_amd_iommu(idx); 3729 3730 if (iommu) 3731 return iommu->max_banks; 3732 3733 return 0; 3734 } 3735 3736 bool amd_iommu_pc_supported(void) 3737 { 3738 return amd_iommu_pc_present; 3739 } 3740 3741 u8 amd_iommu_pc_get_max_counters(unsigned int idx) 3742 { 3743 struct amd_iommu *iommu = get_amd_iommu(idx); 3744 3745 if (iommu) 3746 return iommu->max_counters; 3747 3748 return 0; 3749 } 3750 3751 static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, 3752 u8 fxn, u64 *value, bool is_write) 3753 { 3754 u32 offset; 3755 u32 max_offset_lim; 3756 3757 /* Make sure the IOMMU PC resource is available */ 3758 if (!amd_iommu_pc_present) 3759 return -ENODEV; 3760 3761 /* Check for valid iommu and pc register indexing */ 3762 if (WARN_ON(!iommu || (fxn > 0x28) || (fxn & 7))) 3763 return -ENODEV; 3764 3765 offset = (u32)(((0x40 | bank) << 12) | (cntr << 8) | fxn); 3766 3767 /* Limit the offset to the hw defined mmio region aperture */ 3768 max_offset_lim = (u32)(((0x40 | iommu->max_banks) << 12) | 3769 (iommu->max_counters << 8) | 0x28); 3770 if ((offset < MMIO_CNTR_REG_OFFSET) || 3771 (offset > max_offset_lim)) 3772 return -EINVAL; 3773 3774 if (is_write) { 3775 u64 val = *value & GENMASK_ULL(47, 0); 3776 3777 writel((u32)val, iommu->mmio_base + offset); 3778 writel((val >> 32), iommu->mmio_base + offset + 4); 3779 } else { 3780 *value = readl(iommu->mmio_base + offset + 4); 3781 *value <<= 32; 3782 *value |= readl(iommu->mmio_base + offset); 3783 *value &= GENMASK_ULL(47, 0); 3784 } 3785 3786 return 0; 3787 } 3788 3789 int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value) 3790 { 3791 if (!iommu) 3792 return -EINVAL; 3793 3794 return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, false); 3795 } 3796 3797 int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value) 3798 { 3799 if (!iommu) 3800 return -EINVAL; 3801 3802 return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, true); 3803 } 3804 3805 #ifdef CONFIG_KVM_AMD_SEV 3806 static int iommu_page_make_shared(void *page) 3807 { 3808 unsigned long paddr, pfn; 3809 3810 paddr = iommu_virt_to_phys(page); 3811 /* Cbit maybe set in the paddr */ 3812 pfn = __sme_clr(paddr) >> PAGE_SHIFT; 3813 3814 if (!(pfn % PTRS_PER_PMD)) { 3815 int ret, level; 3816 bool assigned; 3817 3818 ret = snp_lookup_rmpentry(pfn, &assigned, &level); 3819 if (ret) { 3820 pr_warn("IOMMU PFN %lx RMP lookup failed, ret %d\n", pfn, ret); 3821 return ret; 3822 } 3823 3824 if (!assigned) { 3825 pr_warn("IOMMU PFN %lx not assigned in RMP table\n", pfn); 3826 return -EINVAL; 3827 } 3828 3829 if (level > PG_LEVEL_4K) { 3830 ret = psmash(pfn); 3831 if (!ret) 3832 goto done; 3833 3834 pr_warn("PSMASH failed for IOMMU PFN %lx huge RMP entry, ret: %d, level: %d\n", 3835 pfn, ret, level); 3836 return ret; 3837 } 3838 } 3839 3840 done: 3841 return rmp_make_shared(pfn, PG_LEVEL_4K); 3842 } 3843 3844 static int iommu_make_shared(void *va, size_t size) 3845 { 3846 void *page; 3847 int ret; 3848 3849 if (!va) 3850 return 0; 3851 3852 for (page = va; page < (va + size); page += PAGE_SIZE) { 3853 ret = iommu_page_make_shared(page); 3854 if (ret) 3855 return ret; 3856 } 3857 3858 return 0; 3859 } 3860 3861 int amd_iommu_snp_disable(void) 3862 { 3863 struct amd_iommu *iommu; 3864 int ret; 3865 3866 if (!amd_iommu_snp_en) 3867 return 0; 3868 3869 for_each_iommu(iommu) { 3870 ret = iommu_make_shared(iommu->evt_buf, EVT_BUFFER_SIZE); 3871 if (ret) 3872 return ret; 3873 3874 ret = iommu_make_shared(iommu->ppr_log, PPR_LOG_SIZE); 3875 if (ret) 3876 return ret; 3877 3878 ret = iommu_make_shared((void *)iommu->cmd_sem, PAGE_SIZE); 3879 if (ret) 3880 return ret; 3881 } 3882 3883 return 0; 3884 } 3885 EXPORT_SYMBOL_GPL(amd_iommu_snp_disable); 3886 #endif 3887