1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * IOMMU API for s390 PCI devices 4 * 5 * Copyright IBM Corp. 2015 6 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com> 7 */ 8 9 #include <linux/pci.h> 10 #include <linux/iommu.h> 11 #include <linux/iommu-helper.h> 12 #include <linux/sizes.h> 13 #include <linux/rculist.h> 14 #include <linux/rcupdate.h> 15 #include <asm/pci_dma.h> 16 17 #include "dma-iommu.h" 18 19 static const struct iommu_ops s390_iommu_ops; 20 21 static struct kmem_cache *dma_region_table_cache; 22 static struct kmem_cache *dma_page_table_cache; 23 24 static u64 s390_iommu_aperture; 25 static u32 s390_iommu_aperture_factor = 1; 26 27 struct s390_domain { 28 struct iommu_domain domain; 29 struct list_head devices; 30 struct zpci_iommu_ctrs ctrs; 31 unsigned long *dma_table; 32 spinlock_t list_lock; 33 struct rcu_head rcu; 34 }; 35 36 static inline unsigned int calc_rtx(dma_addr_t ptr) 37 { 38 return ((unsigned long)ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK; 39 } 40 41 static inline unsigned int calc_sx(dma_addr_t ptr) 42 { 43 return ((unsigned long)ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK; 44 } 45 46 static inline unsigned int calc_px(dma_addr_t ptr) 47 { 48 return ((unsigned long)ptr >> PAGE_SHIFT) & ZPCI_PT_MASK; 49 } 50 51 static inline void set_pt_pfaa(unsigned long *entry, phys_addr_t pfaa) 52 { 53 *entry &= ZPCI_PTE_FLAG_MASK; 54 *entry |= (pfaa & ZPCI_PTE_ADDR_MASK); 55 } 56 57 static inline void set_rt_sto(unsigned long *entry, phys_addr_t sto) 58 { 59 *entry &= ZPCI_RTE_FLAG_MASK; 60 *entry |= (sto & ZPCI_RTE_ADDR_MASK); 61 *entry |= ZPCI_TABLE_TYPE_RTX; 62 } 63 64 static inline void set_st_pto(unsigned long *entry, phys_addr_t pto) 65 { 66 *entry &= ZPCI_STE_FLAG_MASK; 67 *entry |= (pto & ZPCI_STE_ADDR_MASK); 68 *entry |= ZPCI_TABLE_TYPE_SX; 69 } 70 71 static inline void validate_rt_entry(unsigned long *entry) 72 { 73 *entry &= ~ZPCI_TABLE_VALID_MASK; 74 *entry &= ~ZPCI_TABLE_OFFSET_MASK; 75 *entry |= ZPCI_TABLE_VALID; 76 *entry |= ZPCI_TABLE_LEN_RTX; 77 } 78 79 static inline void validate_st_entry(unsigned long *entry) 80 { 81 *entry &= ~ZPCI_TABLE_VALID_MASK; 82 *entry |= ZPCI_TABLE_VALID; 83 } 84 85 static inline void invalidate_pt_entry(unsigned long *entry) 86 { 87 WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID); 88 *entry &= ~ZPCI_PTE_VALID_MASK; 89 *entry |= ZPCI_PTE_INVALID; 90 } 91 92 static inline void validate_pt_entry(unsigned long *entry) 93 { 94 WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID); 95 *entry &= ~ZPCI_PTE_VALID_MASK; 96 *entry |= ZPCI_PTE_VALID; 97 } 98 99 static inline void entry_set_protected(unsigned long *entry) 100 { 101 *entry &= ~ZPCI_TABLE_PROT_MASK; 102 *entry |= ZPCI_TABLE_PROTECTED; 103 } 104 105 static inline void entry_clr_protected(unsigned long *entry) 106 { 107 *entry &= ~ZPCI_TABLE_PROT_MASK; 108 *entry |= ZPCI_TABLE_UNPROTECTED; 109 } 110 111 static inline int reg_entry_isvalid(unsigned long entry) 112 { 113 return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID; 114 } 115 116 static inline int pt_entry_isvalid(unsigned long entry) 117 { 118 return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID; 119 } 120 121 static inline unsigned long *get_rt_sto(unsigned long entry) 122 { 123 if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX) 124 return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK); 125 else 126 return NULL; 127 } 128 129 static inline unsigned long *get_st_pto(unsigned long entry) 130 { 131 if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX) 132 return phys_to_virt(entry & ZPCI_STE_ADDR_MASK); 133 else 134 return NULL; 135 } 136 137 static int __init dma_alloc_cpu_table_caches(void) 138 { 139 dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables", 140 ZPCI_TABLE_SIZE, 141 ZPCI_TABLE_ALIGN, 142 0, NULL); 143 if (!dma_region_table_cache) 144 return -ENOMEM; 145 146 dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables", 147 ZPCI_PT_SIZE, 148 ZPCI_PT_ALIGN, 149 0, NULL); 150 if (!dma_page_table_cache) { 151 kmem_cache_destroy(dma_region_table_cache); 152 return -ENOMEM; 153 } 154 return 0; 155 } 156 157 static unsigned long *dma_alloc_cpu_table(gfp_t gfp) 158 { 159 unsigned long *table, *entry; 160 161 table = kmem_cache_alloc(dma_region_table_cache, gfp); 162 if (!table) 163 return NULL; 164 165 for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++) 166 *entry = ZPCI_TABLE_INVALID; 167 return table; 168 } 169 170 static void dma_free_cpu_table(void *table) 171 { 172 kmem_cache_free(dma_region_table_cache, table); 173 } 174 175 static void dma_free_page_table(void *table) 176 { 177 kmem_cache_free(dma_page_table_cache, table); 178 } 179 180 static void dma_free_seg_table(unsigned long entry) 181 { 182 unsigned long *sto = get_rt_sto(entry); 183 int sx; 184 185 for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++) 186 if (reg_entry_isvalid(sto[sx])) 187 dma_free_page_table(get_st_pto(sto[sx])); 188 189 dma_free_cpu_table(sto); 190 } 191 192 static void dma_cleanup_tables(unsigned long *table) 193 { 194 int rtx; 195 196 if (!table) 197 return; 198 199 for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++) 200 if (reg_entry_isvalid(table[rtx])) 201 dma_free_seg_table(table[rtx]); 202 203 dma_free_cpu_table(table); 204 } 205 206 static unsigned long *dma_alloc_page_table(gfp_t gfp) 207 { 208 unsigned long *table, *entry; 209 210 table = kmem_cache_alloc(dma_page_table_cache, gfp); 211 if (!table) 212 return NULL; 213 214 for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++) 215 *entry = ZPCI_PTE_INVALID; 216 return table; 217 } 218 219 static unsigned long *dma_get_seg_table_origin(unsigned long *rtep, gfp_t gfp) 220 { 221 unsigned long old_rte, rte; 222 unsigned long *sto; 223 224 rte = READ_ONCE(*rtep); 225 if (reg_entry_isvalid(rte)) { 226 sto = get_rt_sto(rte); 227 } else { 228 sto = dma_alloc_cpu_table(gfp); 229 if (!sto) 230 return NULL; 231 232 set_rt_sto(&rte, virt_to_phys(sto)); 233 validate_rt_entry(&rte); 234 entry_clr_protected(&rte); 235 236 old_rte = cmpxchg(rtep, ZPCI_TABLE_INVALID, rte); 237 if (old_rte != ZPCI_TABLE_INVALID) { 238 /* Somone else was faster, use theirs */ 239 dma_free_cpu_table(sto); 240 sto = get_rt_sto(old_rte); 241 } 242 } 243 return sto; 244 } 245 246 static unsigned long *dma_get_page_table_origin(unsigned long *step, gfp_t gfp) 247 { 248 unsigned long old_ste, ste; 249 unsigned long *pto; 250 251 ste = READ_ONCE(*step); 252 if (reg_entry_isvalid(ste)) { 253 pto = get_st_pto(ste); 254 } else { 255 pto = dma_alloc_page_table(gfp); 256 if (!pto) 257 return NULL; 258 set_st_pto(&ste, virt_to_phys(pto)); 259 validate_st_entry(&ste); 260 entry_clr_protected(&ste); 261 262 old_ste = cmpxchg(step, ZPCI_TABLE_INVALID, ste); 263 if (old_ste != ZPCI_TABLE_INVALID) { 264 /* Somone else was faster, use theirs */ 265 dma_free_page_table(pto); 266 pto = get_st_pto(old_ste); 267 } 268 } 269 return pto; 270 } 271 272 static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr, gfp_t gfp) 273 { 274 unsigned long *sto, *pto; 275 unsigned int rtx, sx, px; 276 277 rtx = calc_rtx(dma_addr); 278 sto = dma_get_seg_table_origin(&rto[rtx], gfp); 279 if (!sto) 280 return NULL; 281 282 sx = calc_sx(dma_addr); 283 pto = dma_get_page_table_origin(&sto[sx], gfp); 284 if (!pto) 285 return NULL; 286 287 px = calc_px(dma_addr); 288 return &pto[px]; 289 } 290 291 static void dma_update_cpu_trans(unsigned long *ptep, phys_addr_t page_addr, int flags) 292 { 293 unsigned long pte; 294 295 pte = READ_ONCE(*ptep); 296 if (flags & ZPCI_PTE_INVALID) { 297 invalidate_pt_entry(&pte); 298 } else { 299 set_pt_pfaa(&pte, page_addr); 300 validate_pt_entry(&pte); 301 } 302 303 if (flags & ZPCI_TABLE_PROTECTED) 304 entry_set_protected(&pte); 305 else 306 entry_clr_protected(&pte); 307 308 xchg(ptep, pte); 309 } 310 311 static struct s390_domain *to_s390_domain(struct iommu_domain *dom) 312 { 313 return container_of(dom, struct s390_domain, domain); 314 } 315 316 static bool s390_iommu_capable(struct device *dev, enum iommu_cap cap) 317 { 318 struct zpci_dev *zdev = to_zpci_dev(dev); 319 320 switch (cap) { 321 case IOMMU_CAP_CACHE_COHERENCY: 322 return true; 323 case IOMMU_CAP_DEFERRED_FLUSH: 324 return zdev->pft != PCI_FUNC_TYPE_ISM; 325 default: 326 return false; 327 } 328 } 329 330 static struct iommu_domain *s390_domain_alloc_paging(struct device *dev) 331 { 332 struct s390_domain *s390_domain; 333 334 s390_domain = kzalloc(sizeof(*s390_domain), GFP_KERNEL); 335 if (!s390_domain) 336 return NULL; 337 338 s390_domain->dma_table = dma_alloc_cpu_table(GFP_KERNEL); 339 if (!s390_domain->dma_table) { 340 kfree(s390_domain); 341 return NULL; 342 } 343 s390_domain->domain.geometry.force_aperture = true; 344 s390_domain->domain.geometry.aperture_start = 0; 345 s390_domain->domain.geometry.aperture_end = ZPCI_TABLE_SIZE_RT - 1; 346 347 spin_lock_init(&s390_domain->list_lock); 348 INIT_LIST_HEAD_RCU(&s390_domain->devices); 349 350 return &s390_domain->domain; 351 } 352 353 static void s390_iommu_rcu_free_domain(struct rcu_head *head) 354 { 355 struct s390_domain *s390_domain = container_of(head, struct s390_domain, rcu); 356 357 dma_cleanup_tables(s390_domain->dma_table); 358 kfree(s390_domain); 359 } 360 361 static void s390_domain_free(struct iommu_domain *domain) 362 { 363 struct s390_domain *s390_domain = to_s390_domain(domain); 364 365 rcu_read_lock(); 366 WARN_ON(!list_empty(&s390_domain->devices)); 367 rcu_read_unlock(); 368 369 call_rcu(&s390_domain->rcu, s390_iommu_rcu_free_domain); 370 } 371 372 static void s390_iommu_detach_device(struct iommu_domain *domain, 373 struct device *dev) 374 { 375 struct s390_domain *s390_domain = to_s390_domain(domain); 376 struct zpci_dev *zdev = to_zpci_dev(dev); 377 unsigned long flags; 378 379 spin_lock_irqsave(&s390_domain->list_lock, flags); 380 list_del_rcu(&zdev->iommu_list); 381 spin_unlock_irqrestore(&s390_domain->list_lock, flags); 382 383 zpci_unregister_ioat(zdev, 0); 384 zdev->s390_domain = NULL; 385 zdev->dma_table = NULL; 386 } 387 388 static int s390_iommu_attach_device(struct iommu_domain *domain, 389 struct device *dev) 390 { 391 struct s390_domain *s390_domain = to_s390_domain(domain); 392 struct zpci_dev *zdev = to_zpci_dev(dev); 393 unsigned long flags; 394 u8 status; 395 int cc; 396 397 if (!zdev) 398 return -ENODEV; 399 400 if (WARN_ON(domain->geometry.aperture_start > zdev->end_dma || 401 domain->geometry.aperture_end < zdev->start_dma)) 402 return -EINVAL; 403 404 if (zdev->s390_domain) 405 s390_iommu_detach_device(&zdev->s390_domain->domain, dev); 406 407 cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, 408 virt_to_phys(s390_domain->dma_table), &status); 409 /* 410 * If the device is undergoing error recovery the reset code 411 * will re-establish the new domain. 412 */ 413 if (cc && status != ZPCI_PCI_ST_FUNC_NOT_AVAIL) 414 return -EIO; 415 416 zdev->dma_table = s390_domain->dma_table; 417 zdev->s390_domain = s390_domain; 418 419 spin_lock_irqsave(&s390_domain->list_lock, flags); 420 list_add_rcu(&zdev->iommu_list, &s390_domain->devices); 421 spin_unlock_irqrestore(&s390_domain->list_lock, flags); 422 423 return 0; 424 } 425 426 static void s390_iommu_get_resv_regions(struct device *dev, 427 struct list_head *list) 428 { 429 struct zpci_dev *zdev = to_zpci_dev(dev); 430 struct iommu_resv_region *region; 431 432 if (zdev->start_dma) { 433 region = iommu_alloc_resv_region(0, zdev->start_dma, 0, 434 IOMMU_RESV_RESERVED, GFP_KERNEL); 435 if (!region) 436 return; 437 list_add_tail(®ion->list, list); 438 } 439 440 if (zdev->end_dma < ZPCI_TABLE_SIZE_RT - 1) { 441 region = iommu_alloc_resv_region(zdev->end_dma + 1, 442 ZPCI_TABLE_SIZE_RT - zdev->end_dma - 1, 443 0, IOMMU_RESV_RESERVED, GFP_KERNEL); 444 if (!region) 445 return; 446 list_add_tail(®ion->list, list); 447 } 448 } 449 450 static struct iommu_device *s390_iommu_probe_device(struct device *dev) 451 { 452 struct zpci_dev *zdev; 453 454 if (!dev_is_pci(dev)) 455 return ERR_PTR(-ENODEV); 456 457 zdev = to_zpci_dev(dev); 458 459 if (zdev->start_dma > zdev->end_dma || 460 zdev->start_dma > ZPCI_TABLE_SIZE_RT - 1) 461 return ERR_PTR(-EINVAL); 462 463 if (zdev->end_dma > ZPCI_TABLE_SIZE_RT - 1) 464 zdev->end_dma = ZPCI_TABLE_SIZE_RT - 1; 465 466 if (zdev->tlb_refresh) 467 dev->iommu->shadow_on_flush = 1; 468 469 return &zdev->iommu_dev; 470 } 471 472 static void s390_iommu_release_device(struct device *dev) 473 { 474 struct zpci_dev *zdev = to_zpci_dev(dev); 475 476 /* 477 * release_device is expected to detach any domain currently attached 478 * to the device, but keep it attached to other devices in the group. 479 */ 480 if (zdev) 481 s390_iommu_detach_device(&zdev->s390_domain->domain, dev); 482 } 483 484 static int zpci_refresh_all(struct zpci_dev *zdev) 485 { 486 return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma, 487 zdev->end_dma - zdev->start_dma + 1); 488 } 489 490 static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain) 491 { 492 struct s390_domain *s390_domain = to_s390_domain(domain); 493 struct zpci_dev *zdev; 494 495 rcu_read_lock(); 496 list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) { 497 atomic64_inc(&s390_domain->ctrs.global_rpcits); 498 zpci_refresh_all(zdev); 499 } 500 rcu_read_unlock(); 501 } 502 503 static void s390_iommu_iotlb_sync(struct iommu_domain *domain, 504 struct iommu_iotlb_gather *gather) 505 { 506 struct s390_domain *s390_domain = to_s390_domain(domain); 507 size_t size = gather->end - gather->start + 1; 508 struct zpci_dev *zdev; 509 510 /* If gather was never added to there is nothing to flush */ 511 if (!gather->end) 512 return; 513 514 rcu_read_lock(); 515 list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) { 516 atomic64_inc(&s390_domain->ctrs.sync_rpcits); 517 zpci_refresh_trans((u64)zdev->fh << 32, gather->start, 518 size); 519 } 520 rcu_read_unlock(); 521 } 522 523 static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain, 524 unsigned long iova, size_t size) 525 { 526 struct s390_domain *s390_domain = to_s390_domain(domain); 527 struct zpci_dev *zdev; 528 int ret = 0; 529 530 rcu_read_lock(); 531 list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) { 532 if (!zdev->tlb_refresh) 533 continue; 534 atomic64_inc(&s390_domain->ctrs.sync_map_rpcits); 535 ret = zpci_refresh_trans((u64)zdev->fh << 32, 536 iova, size); 537 /* 538 * let the hypervisor discover invalidated entries 539 * allowing it to free IOVAs and unpin pages 540 */ 541 if (ret == -ENOMEM) { 542 ret = zpci_refresh_all(zdev); 543 if (ret) 544 break; 545 } 546 } 547 rcu_read_unlock(); 548 549 return ret; 550 } 551 552 static int s390_iommu_validate_trans(struct s390_domain *s390_domain, 553 phys_addr_t pa, dma_addr_t dma_addr, 554 unsigned long nr_pages, int flags, 555 gfp_t gfp) 556 { 557 phys_addr_t page_addr = pa & PAGE_MASK; 558 unsigned long *entry; 559 unsigned long i; 560 int rc; 561 562 for (i = 0; i < nr_pages; i++) { 563 entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr, 564 gfp); 565 if (unlikely(!entry)) { 566 rc = -ENOMEM; 567 goto undo_cpu_trans; 568 } 569 dma_update_cpu_trans(entry, page_addr, flags); 570 page_addr += PAGE_SIZE; 571 dma_addr += PAGE_SIZE; 572 } 573 574 return 0; 575 576 undo_cpu_trans: 577 while (i-- > 0) { 578 dma_addr -= PAGE_SIZE; 579 entry = dma_walk_cpu_trans(s390_domain->dma_table, 580 dma_addr, gfp); 581 if (!entry) 582 break; 583 dma_update_cpu_trans(entry, 0, ZPCI_PTE_INVALID); 584 } 585 586 return rc; 587 } 588 589 static int s390_iommu_invalidate_trans(struct s390_domain *s390_domain, 590 dma_addr_t dma_addr, unsigned long nr_pages) 591 { 592 unsigned long *entry; 593 unsigned long i; 594 int rc = 0; 595 596 for (i = 0; i < nr_pages; i++) { 597 entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr, 598 GFP_ATOMIC); 599 if (unlikely(!entry)) { 600 rc = -EINVAL; 601 break; 602 } 603 dma_update_cpu_trans(entry, 0, ZPCI_PTE_INVALID); 604 dma_addr += PAGE_SIZE; 605 } 606 607 return rc; 608 } 609 610 static int s390_iommu_map_pages(struct iommu_domain *domain, 611 unsigned long iova, phys_addr_t paddr, 612 size_t pgsize, size_t pgcount, 613 int prot, gfp_t gfp, size_t *mapped) 614 { 615 struct s390_domain *s390_domain = to_s390_domain(domain); 616 size_t size = pgcount << __ffs(pgsize); 617 int flags = ZPCI_PTE_VALID, rc = 0; 618 619 if (pgsize != SZ_4K) 620 return -EINVAL; 621 622 if (iova < s390_domain->domain.geometry.aperture_start || 623 (iova + size - 1) > s390_domain->domain.geometry.aperture_end) 624 return -EINVAL; 625 626 if (!IS_ALIGNED(iova | paddr, pgsize)) 627 return -EINVAL; 628 629 if (!(prot & IOMMU_WRITE)) 630 flags |= ZPCI_TABLE_PROTECTED; 631 632 rc = s390_iommu_validate_trans(s390_domain, paddr, iova, 633 pgcount, flags, gfp); 634 if (!rc) { 635 *mapped = size; 636 atomic64_add(pgcount, &s390_domain->ctrs.mapped_pages); 637 } 638 639 return rc; 640 } 641 642 static phys_addr_t s390_iommu_iova_to_phys(struct iommu_domain *domain, 643 dma_addr_t iova) 644 { 645 struct s390_domain *s390_domain = to_s390_domain(domain); 646 unsigned long *rto, *sto, *pto; 647 unsigned long ste, pte, rte; 648 unsigned int rtx, sx, px; 649 phys_addr_t phys = 0; 650 651 if (iova < domain->geometry.aperture_start || 652 iova > domain->geometry.aperture_end) 653 return 0; 654 655 rtx = calc_rtx(iova); 656 sx = calc_sx(iova); 657 px = calc_px(iova); 658 rto = s390_domain->dma_table; 659 660 rte = READ_ONCE(rto[rtx]); 661 if (reg_entry_isvalid(rte)) { 662 sto = get_rt_sto(rte); 663 ste = READ_ONCE(sto[sx]); 664 if (reg_entry_isvalid(ste)) { 665 pto = get_st_pto(ste); 666 pte = READ_ONCE(pto[px]); 667 if (pt_entry_isvalid(pte)) 668 phys = pte & ZPCI_PTE_ADDR_MASK; 669 } 670 } 671 672 return phys; 673 } 674 675 static size_t s390_iommu_unmap_pages(struct iommu_domain *domain, 676 unsigned long iova, 677 size_t pgsize, size_t pgcount, 678 struct iommu_iotlb_gather *gather) 679 { 680 struct s390_domain *s390_domain = to_s390_domain(domain); 681 size_t size = pgcount << __ffs(pgsize); 682 int rc; 683 684 if (WARN_ON(iova < s390_domain->domain.geometry.aperture_start || 685 (iova + size - 1) > s390_domain->domain.geometry.aperture_end)) 686 return 0; 687 688 rc = s390_iommu_invalidate_trans(s390_domain, iova, pgcount); 689 if (rc) 690 return 0; 691 692 iommu_iotlb_gather_add_range(gather, iova, size); 693 atomic64_add(pgcount, &s390_domain->ctrs.unmapped_pages); 694 695 return size; 696 } 697 698 struct zpci_iommu_ctrs *zpci_get_iommu_ctrs(struct zpci_dev *zdev) 699 { 700 if (!zdev || !zdev->s390_domain) 701 return NULL; 702 return &zdev->s390_domain->ctrs; 703 } 704 705 int zpci_init_iommu(struct zpci_dev *zdev) 706 { 707 u64 aperture_size; 708 int rc = 0; 709 710 rc = iommu_device_sysfs_add(&zdev->iommu_dev, NULL, NULL, 711 "s390-iommu.%08x", zdev->fid); 712 if (rc) 713 goto out_err; 714 715 rc = iommu_device_register(&zdev->iommu_dev, &s390_iommu_ops, NULL); 716 if (rc) 717 goto out_sysfs; 718 719 zdev->start_dma = PAGE_ALIGN(zdev->start_dma); 720 aperture_size = min3(s390_iommu_aperture, 721 ZPCI_TABLE_SIZE_RT - zdev->start_dma, 722 zdev->end_dma - zdev->start_dma + 1); 723 zdev->end_dma = zdev->start_dma + aperture_size - 1; 724 725 return 0; 726 727 out_sysfs: 728 iommu_device_sysfs_remove(&zdev->iommu_dev); 729 730 out_err: 731 return rc; 732 } 733 734 void zpci_destroy_iommu(struct zpci_dev *zdev) 735 { 736 iommu_device_unregister(&zdev->iommu_dev); 737 iommu_device_sysfs_remove(&zdev->iommu_dev); 738 } 739 740 static int __init s390_iommu_setup(char *str) 741 { 742 if (!strcmp(str, "strict")) { 743 pr_warn("s390_iommu=strict deprecated; use iommu.strict=1 instead\n"); 744 iommu_set_dma_strict(); 745 } 746 return 1; 747 } 748 749 __setup("s390_iommu=", s390_iommu_setup); 750 751 static int __init s390_iommu_aperture_setup(char *str) 752 { 753 if (kstrtou32(str, 10, &s390_iommu_aperture_factor)) 754 s390_iommu_aperture_factor = 1; 755 return 1; 756 } 757 758 __setup("s390_iommu_aperture=", s390_iommu_aperture_setup); 759 760 static int __init s390_iommu_init(void) 761 { 762 int rc; 763 764 iommu_dma_forcedac = true; 765 s390_iommu_aperture = (u64)virt_to_phys(high_memory); 766 if (!s390_iommu_aperture_factor) 767 s390_iommu_aperture = ULONG_MAX; 768 else 769 s390_iommu_aperture *= s390_iommu_aperture_factor; 770 771 rc = dma_alloc_cpu_table_caches(); 772 if (rc) 773 return rc; 774 775 return rc; 776 } 777 subsys_initcall(s390_iommu_init); 778 779 static const struct iommu_ops s390_iommu_ops = { 780 .capable = s390_iommu_capable, 781 .domain_alloc_paging = s390_domain_alloc_paging, 782 .probe_device = s390_iommu_probe_device, 783 .release_device = s390_iommu_release_device, 784 .device_group = generic_device_group, 785 .pgsize_bitmap = SZ_4K, 786 .get_resv_regions = s390_iommu_get_resv_regions, 787 .default_domain_ops = &(const struct iommu_domain_ops) { 788 .attach_dev = s390_iommu_attach_device, 789 .map_pages = s390_iommu_map_pages, 790 .unmap_pages = s390_iommu_unmap_pages, 791 .flush_iotlb_all = s390_iommu_flush_iotlb_all, 792 .iotlb_sync = s390_iommu_iotlb_sync, 793 .iotlb_sync_map = s390_iommu_iotlb_sync_map, 794 .iova_to_phys = s390_iommu_iova_to_phys, 795 .free = s390_domain_free, 796 } 797 }; 798