1 // SPDX-License-Identifier: GPL-2.0 2 /* pci_sun4v.c: SUN4V specific PCI controller support. 3 * 4 * Copyright (C) 2006, 2007, 2008 David S. Miller (davem@davemloft.net) 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/types.h> 9 #include <linux/pci.h> 10 #include <linux/init.h> 11 #include <linux/slab.h> 12 #include <linux/interrupt.h> 13 #include <linux/percpu.h> 14 #include <linux/irq.h> 15 #include <linux/msi.h> 16 #include <linux/export.h> 17 #include <linux/log2.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/dma-map-ops.h> 21 #include <asm/iommu-common.h> 22 23 #include <asm/iommu.h> 24 #include <asm/irq.h> 25 #include <asm/hypervisor.h> 26 #include <asm/prom.h> 27 28 #include "pci_impl.h" 29 #include "iommu_common.h" 30 #include "kernel.h" 31 32 #include "pci_sun4v.h" 33 34 #define DRIVER_NAME "pci_sun4v" 35 #define PFX DRIVER_NAME ": " 36 37 static unsigned long vpci_major; 38 static unsigned long vpci_minor; 39 40 struct vpci_version { 41 unsigned long major; 42 unsigned long minor; 43 }; 44 45 /* Ordered from largest major to lowest */ 46 static struct vpci_version vpci_versions[] = { 47 { .major = 2, .minor = 0 }, 48 { .major = 1, .minor = 1 }, 49 }; 50 51 static unsigned long vatu_major = 1; 52 static unsigned long vatu_minor = 1; 53 54 #define PGLIST_NENTS (PAGE_SIZE / sizeof(u64)) 55 56 struct iommu_batch { 57 struct device *dev; /* Device mapping is for. */ 58 unsigned long prot; /* IOMMU page protections */ 59 unsigned long entry; /* Index into IOTSB. */ 60 u64 *pglist; /* List of physical pages */ 61 unsigned long npages; /* Number of pages in list. */ 62 }; 63 64 static DEFINE_PER_CPU(struct iommu_batch, iommu_batch); 65 static int iommu_batch_initialized; 66 67 /* Interrupts must be disabled. */ 68 static inline void iommu_batch_start(struct device *dev, unsigned long prot, unsigned long entry) 69 { 70 struct iommu_batch *p = this_cpu_ptr(&iommu_batch); 71 72 p->dev = dev; 73 p->prot = prot; 74 p->entry = entry; 75 p->npages = 0; 76 } 77 78 static inline bool iommu_use_atu(struct iommu *iommu, u64 mask) 79 { 80 return iommu->atu && mask > DMA_BIT_MASK(32); 81 } 82 83 /* Interrupts must be disabled. */ 84 static long iommu_batch_flush(struct iommu_batch *p, u64 mask) 85 { 86 struct pci_pbm_info *pbm = p->dev->archdata.host_controller; 87 u64 *pglist = p->pglist; 88 u64 index_count; 89 unsigned long devhandle = pbm->devhandle; 90 unsigned long prot = p->prot; 91 unsigned long entry = p->entry; 92 unsigned long npages = p->npages; 93 unsigned long iotsb_num; 94 unsigned long ret; 95 long num; 96 97 /* VPCI maj=1, min=[0,1] only supports read and write */ 98 if (vpci_major < 2) 99 prot &= (HV_PCI_MAP_ATTR_READ | HV_PCI_MAP_ATTR_WRITE); 100 101 while (npages != 0) { 102 if (!iommu_use_atu(pbm->iommu, mask)) { 103 num = pci_sun4v_iommu_map(devhandle, 104 HV_PCI_TSBID(0, entry), 105 npages, 106 prot, 107 __pa(pglist)); 108 if (unlikely(num < 0)) { 109 pr_err_ratelimited("%s: IOMMU map of [%08lx:%08llx:%lx:%lx:%lx] failed with status %ld\n", 110 __func__, 111 devhandle, 112 HV_PCI_TSBID(0, entry), 113 npages, prot, __pa(pglist), 114 num); 115 return -1; 116 } 117 } else { 118 index_count = HV_PCI_IOTSB_INDEX_COUNT(npages, entry), 119 iotsb_num = pbm->iommu->atu->iotsb->iotsb_num; 120 ret = pci_sun4v_iotsb_map(devhandle, 121 iotsb_num, 122 index_count, 123 prot, 124 __pa(pglist), 125 &num); 126 if (unlikely(ret != HV_EOK)) { 127 pr_err_ratelimited("%s: ATU map of [%08lx:%lx:%llx:%lx:%lx] failed with status %ld\n", 128 __func__, 129 devhandle, iotsb_num, 130 index_count, prot, 131 __pa(pglist), ret); 132 return -1; 133 } 134 } 135 entry += num; 136 npages -= num; 137 pglist += num; 138 } 139 140 p->entry = entry; 141 p->npages = 0; 142 143 return 0; 144 } 145 146 static inline void iommu_batch_new_entry(unsigned long entry, u64 mask) 147 { 148 struct iommu_batch *p = this_cpu_ptr(&iommu_batch); 149 150 if (p->entry + p->npages == entry) 151 return; 152 if (p->entry != ~0UL) 153 iommu_batch_flush(p, mask); 154 p->entry = entry; 155 } 156 157 /* Interrupts must be disabled. */ 158 static inline long iommu_batch_add(u64 phys_page, u64 mask) 159 { 160 struct iommu_batch *p = this_cpu_ptr(&iommu_batch); 161 162 BUG_ON(p->npages >= PGLIST_NENTS); 163 164 p->pglist[p->npages++] = phys_page; 165 if (p->npages == PGLIST_NENTS) 166 return iommu_batch_flush(p, mask); 167 168 return 0; 169 } 170 171 /* Interrupts must be disabled. */ 172 static inline long iommu_batch_end(u64 mask) 173 { 174 struct iommu_batch *p = this_cpu_ptr(&iommu_batch); 175 176 BUG_ON(p->npages >= PGLIST_NENTS); 177 178 return iommu_batch_flush(p, mask); 179 } 180 181 static void *dma_4v_alloc_coherent(struct device *dev, size_t size, 182 dma_addr_t *dma_addrp, gfp_t gfp, 183 unsigned long attrs) 184 { 185 u64 mask; 186 unsigned long flags, order, first_page, npages, n; 187 unsigned long prot = 0; 188 struct iommu *iommu; 189 struct iommu_map_table *tbl; 190 struct page *page; 191 void *ret; 192 long entry; 193 int nid; 194 195 size = IO_PAGE_ALIGN(size); 196 order = get_order(size); 197 if (unlikely(order > MAX_ORDER)) 198 return NULL; 199 200 npages = size >> IO_PAGE_SHIFT; 201 202 if (attrs & DMA_ATTR_WEAK_ORDERING) 203 prot = HV_PCI_MAP_ATTR_RELAXED_ORDER; 204 205 nid = dev->archdata.numa_node; 206 page = alloc_pages_node(nid, gfp, order); 207 if (unlikely(!page)) 208 return NULL; 209 210 first_page = (unsigned long) page_address(page); 211 memset((char *)first_page, 0, PAGE_SIZE << order); 212 213 iommu = dev->archdata.iommu; 214 mask = dev->coherent_dma_mask; 215 if (!iommu_use_atu(iommu, mask)) 216 tbl = &iommu->tbl; 217 else 218 tbl = &iommu->atu->tbl; 219 220 entry = iommu_tbl_range_alloc(dev, tbl, npages, NULL, 221 (unsigned long)(-1), 0); 222 223 if (unlikely(entry == IOMMU_ERROR_CODE)) 224 goto range_alloc_fail; 225 226 *dma_addrp = (tbl->table_map_base + (entry << IO_PAGE_SHIFT)); 227 ret = (void *) first_page; 228 first_page = __pa(first_page); 229 230 local_irq_save(flags); 231 232 iommu_batch_start(dev, 233 (HV_PCI_MAP_ATTR_READ | prot | 234 HV_PCI_MAP_ATTR_WRITE), 235 entry); 236 237 for (n = 0; n < npages; n++) { 238 long err = iommu_batch_add(first_page + (n * PAGE_SIZE), mask); 239 if (unlikely(err < 0L)) 240 goto iommu_map_fail; 241 } 242 243 if (unlikely(iommu_batch_end(mask) < 0L)) 244 goto iommu_map_fail; 245 246 local_irq_restore(flags); 247 248 return ret; 249 250 iommu_map_fail: 251 local_irq_restore(flags); 252 iommu_tbl_range_free(tbl, *dma_addrp, npages, IOMMU_ERROR_CODE); 253 254 range_alloc_fail: 255 free_pages(first_page, order); 256 return NULL; 257 } 258 259 unsigned long dma_4v_iotsb_bind(unsigned long devhandle, 260 unsigned long iotsb_num, 261 struct pci_bus *bus_dev) 262 { 263 struct pci_dev *pdev; 264 unsigned long err; 265 unsigned int bus; 266 unsigned int device; 267 unsigned int fun; 268 269 list_for_each_entry(pdev, &bus_dev->devices, bus_list) { 270 if (pdev->subordinate) { 271 /* No need to bind pci bridge */ 272 dma_4v_iotsb_bind(devhandle, iotsb_num, 273 pdev->subordinate); 274 } else { 275 bus = bus_dev->number; 276 device = PCI_SLOT(pdev->devfn); 277 fun = PCI_FUNC(pdev->devfn); 278 err = pci_sun4v_iotsb_bind(devhandle, iotsb_num, 279 HV_PCI_DEVICE_BUILD(bus, 280 device, 281 fun)); 282 283 /* If bind fails for one device it is going to fail 284 * for rest of the devices because we are sharing 285 * IOTSB. So in case of failure simply return with 286 * error. 287 */ 288 if (err) 289 return err; 290 } 291 } 292 293 return 0; 294 } 295 296 static void dma_4v_iommu_demap(struct device *dev, unsigned long devhandle, 297 dma_addr_t dvma, unsigned long iotsb_num, 298 unsigned long entry, unsigned long npages) 299 { 300 unsigned long num, flags; 301 unsigned long ret; 302 303 local_irq_save(flags); 304 do { 305 if (dvma <= DMA_BIT_MASK(32)) { 306 num = pci_sun4v_iommu_demap(devhandle, 307 HV_PCI_TSBID(0, entry), 308 npages); 309 } else { 310 ret = pci_sun4v_iotsb_demap(devhandle, iotsb_num, 311 entry, npages, &num); 312 if (unlikely(ret != HV_EOK)) { 313 pr_err_ratelimited("pci_iotsb_demap() failed with error: %ld\n", 314 ret); 315 } 316 } 317 entry += num; 318 npages -= num; 319 } while (npages != 0); 320 local_irq_restore(flags); 321 } 322 323 static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu, 324 dma_addr_t dvma, unsigned long attrs) 325 { 326 struct pci_pbm_info *pbm; 327 struct iommu *iommu; 328 struct atu *atu; 329 struct iommu_map_table *tbl; 330 unsigned long order, npages, entry; 331 unsigned long iotsb_num; 332 u32 devhandle; 333 334 npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT; 335 iommu = dev->archdata.iommu; 336 pbm = dev->archdata.host_controller; 337 atu = iommu->atu; 338 devhandle = pbm->devhandle; 339 340 if (!iommu_use_atu(iommu, dvma)) { 341 tbl = &iommu->tbl; 342 iotsb_num = 0; /* we don't care for legacy iommu */ 343 } else { 344 tbl = &atu->tbl; 345 iotsb_num = atu->iotsb->iotsb_num; 346 } 347 entry = ((dvma - tbl->table_map_base) >> IO_PAGE_SHIFT); 348 dma_4v_iommu_demap(dev, devhandle, dvma, iotsb_num, entry, npages); 349 iommu_tbl_range_free(tbl, dvma, npages, IOMMU_ERROR_CODE); 350 order = get_order(size); 351 if (order < 10) 352 free_pages((unsigned long)cpu, order); 353 } 354 355 static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page, 356 unsigned long offset, size_t sz, 357 enum dma_data_direction direction, 358 unsigned long attrs) 359 { 360 struct iommu *iommu; 361 struct atu *atu; 362 struct iommu_map_table *tbl; 363 u64 mask; 364 unsigned long flags, npages, oaddr; 365 unsigned long i, base_paddr; 366 unsigned long prot; 367 dma_addr_t bus_addr, ret; 368 long entry; 369 370 iommu = dev->archdata.iommu; 371 atu = iommu->atu; 372 373 if (unlikely(direction == DMA_NONE)) 374 goto bad; 375 376 oaddr = (unsigned long)(page_address(page) + offset); 377 npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK); 378 npages >>= IO_PAGE_SHIFT; 379 380 mask = *dev->dma_mask; 381 if (!iommu_use_atu(iommu, mask)) 382 tbl = &iommu->tbl; 383 else 384 tbl = &atu->tbl; 385 386 entry = iommu_tbl_range_alloc(dev, tbl, npages, NULL, 387 (unsigned long)(-1), 0); 388 389 if (unlikely(entry == IOMMU_ERROR_CODE)) 390 goto bad; 391 392 bus_addr = (tbl->table_map_base + (entry << IO_PAGE_SHIFT)); 393 ret = bus_addr | (oaddr & ~IO_PAGE_MASK); 394 base_paddr = __pa(oaddr & IO_PAGE_MASK); 395 prot = HV_PCI_MAP_ATTR_READ; 396 if (direction != DMA_TO_DEVICE) 397 prot |= HV_PCI_MAP_ATTR_WRITE; 398 399 if (attrs & DMA_ATTR_WEAK_ORDERING) 400 prot |= HV_PCI_MAP_ATTR_RELAXED_ORDER; 401 402 local_irq_save(flags); 403 404 iommu_batch_start(dev, prot, entry); 405 406 for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) { 407 long err = iommu_batch_add(base_paddr, mask); 408 if (unlikely(err < 0L)) 409 goto iommu_map_fail; 410 } 411 if (unlikely(iommu_batch_end(mask) < 0L)) 412 goto iommu_map_fail; 413 414 local_irq_restore(flags); 415 416 return ret; 417 418 bad: 419 if (printk_ratelimit()) 420 WARN_ON(1); 421 return DMA_MAPPING_ERROR; 422 423 iommu_map_fail: 424 local_irq_restore(flags); 425 iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE); 426 return DMA_MAPPING_ERROR; 427 } 428 429 static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr, 430 size_t sz, enum dma_data_direction direction, 431 unsigned long attrs) 432 { 433 struct pci_pbm_info *pbm; 434 struct iommu *iommu; 435 struct atu *atu; 436 struct iommu_map_table *tbl; 437 unsigned long npages; 438 unsigned long iotsb_num; 439 long entry; 440 u32 devhandle; 441 442 if (unlikely(direction == DMA_NONE)) { 443 if (printk_ratelimit()) 444 WARN_ON(1); 445 return; 446 } 447 448 iommu = dev->archdata.iommu; 449 pbm = dev->archdata.host_controller; 450 atu = iommu->atu; 451 devhandle = pbm->devhandle; 452 453 npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK); 454 npages >>= IO_PAGE_SHIFT; 455 bus_addr &= IO_PAGE_MASK; 456 457 if (bus_addr <= DMA_BIT_MASK(32)) { 458 iotsb_num = 0; /* we don't care for legacy iommu */ 459 tbl = &iommu->tbl; 460 } else { 461 iotsb_num = atu->iotsb->iotsb_num; 462 tbl = &atu->tbl; 463 } 464 entry = (bus_addr - tbl->table_map_base) >> IO_PAGE_SHIFT; 465 dma_4v_iommu_demap(dev, devhandle, bus_addr, iotsb_num, entry, npages); 466 iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE); 467 } 468 469 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist, 470 int nelems, enum dma_data_direction direction, 471 unsigned long attrs) 472 { 473 struct scatterlist *s, *outs, *segstart; 474 unsigned long flags, handle, prot; 475 dma_addr_t dma_next = 0, dma_addr; 476 unsigned int max_seg_size; 477 unsigned long seg_boundary_size; 478 int outcount, incount, i; 479 struct iommu *iommu; 480 struct atu *atu; 481 struct iommu_map_table *tbl; 482 u64 mask; 483 unsigned long base_shift; 484 long err; 485 486 BUG_ON(direction == DMA_NONE); 487 488 iommu = dev->archdata.iommu; 489 if (nelems == 0 || !iommu) 490 return -EINVAL; 491 atu = iommu->atu; 492 493 prot = HV_PCI_MAP_ATTR_READ; 494 if (direction != DMA_TO_DEVICE) 495 prot |= HV_PCI_MAP_ATTR_WRITE; 496 497 if (attrs & DMA_ATTR_WEAK_ORDERING) 498 prot |= HV_PCI_MAP_ATTR_RELAXED_ORDER; 499 500 outs = s = segstart = &sglist[0]; 501 outcount = 1; 502 incount = nelems; 503 handle = 0; 504 505 /* Init first segment length for backout at failure */ 506 outs->dma_length = 0; 507 508 local_irq_save(flags); 509 510 iommu_batch_start(dev, prot, ~0UL); 511 512 max_seg_size = dma_get_max_seg_size(dev); 513 seg_boundary_size = dma_get_seg_boundary_nr_pages(dev, IO_PAGE_SHIFT); 514 515 mask = *dev->dma_mask; 516 if (!iommu_use_atu(iommu, mask)) 517 tbl = &iommu->tbl; 518 else 519 tbl = &atu->tbl; 520 521 base_shift = tbl->table_map_base >> IO_PAGE_SHIFT; 522 523 for_each_sg(sglist, s, nelems, i) { 524 unsigned long paddr, npages, entry, out_entry = 0, slen; 525 526 slen = s->length; 527 /* Sanity check */ 528 if (slen == 0) { 529 dma_next = 0; 530 continue; 531 } 532 /* Allocate iommu entries for that segment */ 533 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s); 534 npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE); 535 entry = iommu_tbl_range_alloc(dev, tbl, npages, 536 &handle, (unsigned long)(-1), 0); 537 538 /* Handle failure */ 539 if (unlikely(entry == IOMMU_ERROR_CODE)) { 540 pr_err_ratelimited("iommu_alloc failed, iommu %p paddr %lx npages %lx\n", 541 tbl, paddr, npages); 542 goto iommu_map_failed; 543 } 544 545 iommu_batch_new_entry(entry, mask); 546 547 /* Convert entry to a dma_addr_t */ 548 dma_addr = tbl->table_map_base + (entry << IO_PAGE_SHIFT); 549 dma_addr |= (s->offset & ~IO_PAGE_MASK); 550 551 /* Insert into HW table */ 552 paddr &= IO_PAGE_MASK; 553 while (npages--) { 554 err = iommu_batch_add(paddr, mask); 555 if (unlikely(err < 0L)) 556 goto iommu_map_failed; 557 paddr += IO_PAGE_SIZE; 558 } 559 560 /* If we are in an open segment, try merging */ 561 if (segstart != s) { 562 /* We cannot merge if: 563 * - allocated dma_addr isn't contiguous to previous allocation 564 */ 565 if ((dma_addr != dma_next) || 566 (outs->dma_length + s->length > max_seg_size) || 567 (is_span_boundary(out_entry, base_shift, 568 seg_boundary_size, outs, s))) { 569 /* Can't merge: create a new segment */ 570 segstart = s; 571 outcount++; 572 outs = sg_next(outs); 573 } else { 574 outs->dma_length += s->length; 575 } 576 } 577 578 if (segstart == s) { 579 /* This is a new segment, fill entries */ 580 outs->dma_address = dma_addr; 581 outs->dma_length = slen; 582 out_entry = entry; 583 } 584 585 /* Calculate next page pointer for contiguous check */ 586 dma_next = dma_addr + slen; 587 } 588 589 err = iommu_batch_end(mask); 590 591 if (unlikely(err < 0L)) 592 goto iommu_map_failed; 593 594 local_irq_restore(flags); 595 596 if (outcount < incount) { 597 outs = sg_next(outs); 598 outs->dma_length = 0; 599 } 600 601 return outcount; 602 603 iommu_map_failed: 604 for_each_sg(sglist, s, nelems, i) { 605 if (s->dma_length != 0) { 606 unsigned long vaddr, npages; 607 608 vaddr = s->dma_address & IO_PAGE_MASK; 609 npages = iommu_num_pages(s->dma_address, s->dma_length, 610 IO_PAGE_SIZE); 611 iommu_tbl_range_free(tbl, vaddr, npages, 612 IOMMU_ERROR_CODE); 613 /* XXX demap? XXX */ 614 s->dma_length = 0; 615 } 616 if (s == outs) 617 break; 618 } 619 local_irq_restore(flags); 620 621 return -EINVAL; 622 } 623 624 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist, 625 int nelems, enum dma_data_direction direction, 626 unsigned long attrs) 627 { 628 struct pci_pbm_info *pbm; 629 struct scatterlist *sg; 630 struct iommu *iommu; 631 struct atu *atu; 632 unsigned long flags, entry; 633 unsigned long iotsb_num; 634 u32 devhandle; 635 636 BUG_ON(direction == DMA_NONE); 637 638 iommu = dev->archdata.iommu; 639 pbm = dev->archdata.host_controller; 640 atu = iommu->atu; 641 devhandle = pbm->devhandle; 642 643 local_irq_save(flags); 644 645 sg = sglist; 646 while (nelems--) { 647 dma_addr_t dma_handle = sg->dma_address; 648 unsigned int len = sg->dma_length; 649 unsigned long npages; 650 struct iommu_map_table *tbl; 651 unsigned long shift = IO_PAGE_SHIFT; 652 653 if (!len) 654 break; 655 npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE); 656 657 if (dma_handle <= DMA_BIT_MASK(32)) { 658 iotsb_num = 0; /* we don't care for legacy iommu */ 659 tbl = &iommu->tbl; 660 } else { 661 iotsb_num = atu->iotsb->iotsb_num; 662 tbl = &atu->tbl; 663 } 664 entry = ((dma_handle - tbl->table_map_base) >> shift); 665 dma_4v_iommu_demap(dev, devhandle, dma_handle, iotsb_num, 666 entry, npages); 667 iommu_tbl_range_free(tbl, dma_handle, npages, 668 IOMMU_ERROR_CODE); 669 sg = sg_next(sg); 670 } 671 672 local_irq_restore(flags); 673 } 674 675 static int dma_4v_supported(struct device *dev, u64 device_mask) 676 { 677 struct iommu *iommu = dev->archdata.iommu; 678 679 if (ali_sound_dma_hack(dev, device_mask)) 680 return 1; 681 if (device_mask < iommu->dma_addr_mask) 682 return 0; 683 return 1; 684 } 685 686 static const struct dma_map_ops sun4v_dma_ops = { 687 .alloc = dma_4v_alloc_coherent, 688 .free = dma_4v_free_coherent, 689 .map_page = dma_4v_map_page, 690 .unmap_page = dma_4v_unmap_page, 691 .map_sg = dma_4v_map_sg, 692 .unmap_sg = dma_4v_unmap_sg, 693 .dma_supported = dma_4v_supported, 694 }; 695 696 static void pci_sun4v_scan_bus(struct pci_pbm_info *pbm, struct device *parent) 697 { 698 struct property *prop; 699 struct device_node *dp; 700 701 dp = pbm->op->dev.of_node; 702 prop = of_find_property(dp, "66mhz-capable", NULL); 703 pbm->is_66mhz_capable = (prop != NULL); 704 pbm->pci_bus = pci_scan_one_pbm(pbm, parent); 705 706 /* XXX register error interrupt handlers XXX */ 707 } 708 709 static unsigned long probe_existing_entries(struct pci_pbm_info *pbm, 710 struct iommu_map_table *iommu) 711 { 712 struct iommu_pool *pool; 713 unsigned long i, pool_nr, cnt = 0; 714 u32 devhandle; 715 716 devhandle = pbm->devhandle; 717 for (pool_nr = 0; pool_nr < iommu->nr_pools; pool_nr++) { 718 pool = &(iommu->pools[pool_nr]); 719 for (i = pool->start; i <= pool->end; i++) { 720 unsigned long ret, io_attrs, ra; 721 722 ret = pci_sun4v_iommu_getmap(devhandle, 723 HV_PCI_TSBID(0, i), 724 &io_attrs, &ra); 725 if (ret == HV_EOK) { 726 if (page_in_phys_avail(ra)) { 727 pci_sun4v_iommu_demap(devhandle, 728 HV_PCI_TSBID(0, 729 i), 1); 730 } else { 731 cnt++; 732 __set_bit(i, iommu->map); 733 } 734 } 735 } 736 } 737 return cnt; 738 } 739 740 static int pci_sun4v_atu_alloc_iotsb(struct pci_pbm_info *pbm) 741 { 742 struct atu *atu = pbm->iommu->atu; 743 struct atu_iotsb *iotsb; 744 void *table; 745 u64 table_size; 746 u64 iotsb_num; 747 unsigned long order; 748 unsigned long err; 749 750 iotsb = kzalloc(sizeof(*iotsb), GFP_KERNEL); 751 if (!iotsb) { 752 err = -ENOMEM; 753 goto out_err; 754 } 755 atu->iotsb = iotsb; 756 757 /* calculate size of IOTSB */ 758 table_size = (atu->size / IO_PAGE_SIZE) * 8; 759 order = get_order(table_size); 760 table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 761 if (!table) { 762 err = -ENOMEM; 763 goto table_failed; 764 } 765 iotsb->table = table; 766 iotsb->ra = __pa(table); 767 iotsb->dvma_size = atu->size; 768 iotsb->dvma_base = atu->base; 769 iotsb->table_size = table_size; 770 iotsb->page_size = IO_PAGE_SIZE; 771 772 /* configure and register IOTSB with HV */ 773 err = pci_sun4v_iotsb_conf(pbm->devhandle, 774 iotsb->ra, 775 iotsb->table_size, 776 iotsb->page_size, 777 iotsb->dvma_base, 778 &iotsb_num); 779 if (err) { 780 pr_err(PFX "pci_iotsb_conf failed error: %ld\n", err); 781 goto iotsb_conf_failed; 782 } 783 iotsb->iotsb_num = iotsb_num; 784 785 err = dma_4v_iotsb_bind(pbm->devhandle, iotsb_num, pbm->pci_bus); 786 if (err) { 787 pr_err(PFX "pci_iotsb_bind failed error: %ld\n", err); 788 goto iotsb_conf_failed; 789 } 790 791 return 0; 792 793 iotsb_conf_failed: 794 free_pages((unsigned long)table, order); 795 table_failed: 796 kfree(iotsb); 797 out_err: 798 return err; 799 } 800 801 static int pci_sun4v_atu_init(struct pci_pbm_info *pbm) 802 { 803 struct atu *atu = pbm->iommu->atu; 804 unsigned long err; 805 const u64 *ranges; 806 u64 map_size, num_iotte; 807 u64 dma_mask; 808 const u32 *page_size; 809 int len; 810 811 ranges = of_get_property(pbm->op->dev.of_node, "iommu-address-ranges", 812 &len); 813 if (!ranges) { 814 pr_err(PFX "No iommu-address-ranges\n"); 815 return -EINVAL; 816 } 817 818 page_size = of_get_property(pbm->op->dev.of_node, "iommu-pagesizes", 819 NULL); 820 if (!page_size) { 821 pr_err(PFX "No iommu-pagesizes\n"); 822 return -EINVAL; 823 } 824 825 /* There are 4 iommu-address-ranges supported. Each range is pair of 826 * {base, size}. The ranges[0] and ranges[1] are 32bit address space 827 * while ranges[2] and ranges[3] are 64bit space. We want to use 64bit 828 * address ranges to support 64bit addressing. Because 'size' for 829 * address ranges[2] and ranges[3] are same we can select either of 830 * ranges[2] or ranges[3] for mapping. However due to 'size' is too 831 * large for OS to allocate IOTSB we are using fix size 32G 832 * (ATU_64_SPACE_SIZE) which is more than enough for all PCIe devices 833 * to share. 834 */ 835 atu->ranges = (struct atu_ranges *)ranges; 836 atu->base = atu->ranges[3].base; 837 atu->size = ATU_64_SPACE_SIZE; 838 839 /* Create IOTSB */ 840 err = pci_sun4v_atu_alloc_iotsb(pbm); 841 if (err) { 842 pr_err(PFX "Error creating ATU IOTSB\n"); 843 return err; 844 } 845 846 /* Create ATU iommu map. 847 * One bit represents one iotte in IOTSB table. 848 */ 849 dma_mask = (roundup_pow_of_two(atu->size) - 1UL); 850 num_iotte = atu->size / IO_PAGE_SIZE; 851 map_size = num_iotte / 8; 852 atu->tbl.table_map_base = atu->base; 853 atu->dma_addr_mask = dma_mask; 854 atu->tbl.map = kzalloc(map_size, GFP_KERNEL); 855 if (!atu->tbl.map) 856 return -ENOMEM; 857 858 iommu_tbl_pool_init(&atu->tbl, num_iotte, IO_PAGE_SHIFT, 859 NULL, false /* no large_pool */, 860 0 /* default npools */, 861 false /* want span boundary checking */); 862 863 return 0; 864 } 865 866 static int pci_sun4v_iommu_init(struct pci_pbm_info *pbm) 867 { 868 static const u32 vdma_default[] = { 0x80000000, 0x80000000 }; 869 struct iommu *iommu = pbm->iommu; 870 unsigned long num_tsb_entries, sz; 871 u32 dma_mask, dma_offset; 872 const u32 *vdma; 873 874 vdma = of_get_property(pbm->op->dev.of_node, "virtual-dma", NULL); 875 if (!vdma) 876 vdma = vdma_default; 877 878 if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) { 879 printk(KERN_ERR PFX "Strange virtual-dma[%08x:%08x].\n", 880 vdma[0], vdma[1]); 881 return -EINVAL; 882 } 883 884 dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL); 885 num_tsb_entries = vdma[1] / IO_PAGE_SIZE; 886 887 dma_offset = vdma[0]; 888 889 /* Setup initial software IOMMU state. */ 890 spin_lock_init(&iommu->lock); 891 iommu->ctx_lowest_free = 1; 892 iommu->tbl.table_map_base = dma_offset; 893 iommu->dma_addr_mask = dma_mask; 894 895 /* Allocate and initialize the free area map. */ 896 sz = (num_tsb_entries + 7) / 8; 897 sz = (sz + 7UL) & ~7UL; 898 iommu->tbl.map = kzalloc(sz, GFP_KERNEL); 899 if (!iommu->tbl.map) { 900 printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n"); 901 return -ENOMEM; 902 } 903 iommu_tbl_pool_init(&iommu->tbl, num_tsb_entries, IO_PAGE_SHIFT, 904 NULL, false /* no large_pool */, 905 0 /* default npools */, 906 false /* want span boundary checking */); 907 sz = probe_existing_entries(pbm, &iommu->tbl); 908 if (sz) 909 printk("%s: Imported %lu TSB entries from OBP\n", 910 pbm->name, sz); 911 912 return 0; 913 } 914 915 #ifdef CONFIG_PCI_MSI 916 struct pci_sun4v_msiq_entry { 917 u64 version_type; 918 #define MSIQ_VERSION_MASK 0xffffffff00000000UL 919 #define MSIQ_VERSION_SHIFT 32 920 #define MSIQ_TYPE_MASK 0x00000000000000ffUL 921 #define MSIQ_TYPE_SHIFT 0 922 #define MSIQ_TYPE_NONE 0x00 923 #define MSIQ_TYPE_MSG 0x01 924 #define MSIQ_TYPE_MSI32 0x02 925 #define MSIQ_TYPE_MSI64 0x03 926 #define MSIQ_TYPE_INTX 0x08 927 #define MSIQ_TYPE_NONE2 0xff 928 929 u64 intx_sysino; 930 u64 reserved1; 931 u64 stick; 932 u64 req_id; /* bus/device/func */ 933 #define MSIQ_REQID_BUS_MASK 0xff00UL 934 #define MSIQ_REQID_BUS_SHIFT 8 935 #define MSIQ_REQID_DEVICE_MASK 0x00f8UL 936 #define MSIQ_REQID_DEVICE_SHIFT 3 937 #define MSIQ_REQID_FUNC_MASK 0x0007UL 938 #define MSIQ_REQID_FUNC_SHIFT 0 939 940 u64 msi_address; 941 942 /* The format of this value is message type dependent. 943 * For MSI bits 15:0 are the data from the MSI packet. 944 * For MSI-X bits 31:0 are the data from the MSI packet. 945 * For MSG, the message code and message routing code where: 946 * bits 39:32 is the bus/device/fn of the msg target-id 947 * bits 18:16 is the message routing code 948 * bits 7:0 is the message code 949 * For INTx the low order 2-bits are: 950 * 00 - INTA 951 * 01 - INTB 952 * 10 - INTC 953 * 11 - INTD 954 */ 955 u64 msi_data; 956 957 u64 reserved2; 958 }; 959 960 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid, 961 unsigned long *head) 962 { 963 unsigned long err, limit; 964 965 err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head); 966 if (unlikely(err)) 967 return -ENXIO; 968 969 limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry); 970 if (unlikely(*head >= limit)) 971 return -EFBIG; 972 973 return 0; 974 } 975 976 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm, 977 unsigned long msiqid, unsigned long *head, 978 unsigned long *msi) 979 { 980 struct pci_sun4v_msiq_entry *ep; 981 unsigned long err, type; 982 983 /* Note: void pointer arithmetic, 'head' is a byte offset */ 984 ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * 985 (pbm->msiq_ent_count * 986 sizeof(struct pci_sun4v_msiq_entry))) + 987 *head); 988 989 if ((ep->version_type & MSIQ_TYPE_MASK) == 0) 990 return 0; 991 992 type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT; 993 if (unlikely(type != MSIQ_TYPE_MSI32 && 994 type != MSIQ_TYPE_MSI64)) 995 return -EINVAL; 996 997 *msi = ep->msi_data; 998 999 err = pci_sun4v_msi_setstate(pbm->devhandle, 1000 ep->msi_data /* msi_num */, 1001 HV_MSISTATE_IDLE); 1002 if (unlikely(err)) 1003 return -ENXIO; 1004 1005 /* Clear the entry. */ 1006 ep->version_type &= ~MSIQ_TYPE_MASK; 1007 1008 (*head) += sizeof(struct pci_sun4v_msiq_entry); 1009 if (*head >= 1010 (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry))) 1011 *head = 0; 1012 1013 return 1; 1014 } 1015 1016 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid, 1017 unsigned long head) 1018 { 1019 unsigned long err; 1020 1021 err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head); 1022 if (unlikely(err)) 1023 return -EINVAL; 1024 1025 return 0; 1026 } 1027 1028 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid, 1029 unsigned long msi, int is_msi64) 1030 { 1031 if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid, 1032 (is_msi64 ? 1033 HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32))) 1034 return -ENXIO; 1035 if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE)) 1036 return -ENXIO; 1037 if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID)) 1038 return -ENXIO; 1039 return 0; 1040 } 1041 1042 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi) 1043 { 1044 unsigned long err, msiqid; 1045 1046 err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid); 1047 if (err) 1048 return -ENXIO; 1049 1050 pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID); 1051 1052 return 0; 1053 } 1054 1055 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm) 1056 { 1057 unsigned long q_size, alloc_size, pages, order; 1058 int i; 1059 1060 q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry); 1061 alloc_size = (pbm->msiq_num * q_size); 1062 order = get_order(alloc_size); 1063 pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order); 1064 if (pages == 0UL) { 1065 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n", 1066 order); 1067 return -ENOMEM; 1068 } 1069 memset((char *)pages, 0, PAGE_SIZE << order); 1070 pbm->msi_queues = (void *) pages; 1071 1072 for (i = 0; i < pbm->msiq_num; i++) { 1073 unsigned long err, base = __pa(pages + (i * q_size)); 1074 unsigned long ret1, ret2; 1075 1076 err = pci_sun4v_msiq_conf(pbm->devhandle, 1077 pbm->msiq_first + i, 1078 base, pbm->msiq_ent_count); 1079 if (err) { 1080 printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n", 1081 err); 1082 goto h_error; 1083 } 1084 1085 err = pci_sun4v_msiq_info(pbm->devhandle, 1086 pbm->msiq_first + i, 1087 &ret1, &ret2); 1088 if (err) { 1089 printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n", 1090 err); 1091 goto h_error; 1092 } 1093 if (ret1 != base || ret2 != pbm->msiq_ent_count) { 1094 printk(KERN_ERR "MSI: Bogus qconf " 1095 "expected[%lx:%x] got[%lx:%lx]\n", 1096 base, pbm->msiq_ent_count, 1097 ret1, ret2); 1098 goto h_error; 1099 } 1100 } 1101 1102 return 0; 1103 1104 h_error: 1105 free_pages(pages, order); 1106 return -EINVAL; 1107 } 1108 1109 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm) 1110 { 1111 unsigned long q_size, alloc_size, pages, order; 1112 int i; 1113 1114 for (i = 0; i < pbm->msiq_num; i++) { 1115 unsigned long msiqid = pbm->msiq_first + i; 1116 1117 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0); 1118 } 1119 1120 q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry); 1121 alloc_size = (pbm->msiq_num * q_size); 1122 order = get_order(alloc_size); 1123 1124 pages = (unsigned long) pbm->msi_queues; 1125 1126 free_pages(pages, order); 1127 1128 pbm->msi_queues = NULL; 1129 } 1130 1131 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm, 1132 unsigned long msiqid, 1133 unsigned long devino) 1134 { 1135 unsigned int irq = sun4v_build_irq(pbm->devhandle, devino); 1136 1137 if (!irq) 1138 return -ENOMEM; 1139 1140 if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID)) 1141 return -EINVAL; 1142 if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE)) 1143 return -EINVAL; 1144 1145 return irq; 1146 } 1147 1148 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = { 1149 .get_head = pci_sun4v_get_head, 1150 .dequeue_msi = pci_sun4v_dequeue_msi, 1151 .set_head = pci_sun4v_set_head, 1152 .msi_setup = pci_sun4v_msi_setup, 1153 .msi_teardown = pci_sun4v_msi_teardown, 1154 .msiq_alloc = pci_sun4v_msiq_alloc, 1155 .msiq_free = pci_sun4v_msiq_free, 1156 .msiq_build_irq = pci_sun4v_msiq_build_irq, 1157 }; 1158 1159 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm) 1160 { 1161 sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops); 1162 } 1163 #else /* CONFIG_PCI_MSI */ 1164 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm) 1165 { 1166 } 1167 #endif /* !(CONFIG_PCI_MSI) */ 1168 1169 static int pci_sun4v_pbm_init(struct pci_pbm_info *pbm, 1170 struct platform_device *op, u32 devhandle) 1171 { 1172 struct device_node *dp = op->dev.of_node; 1173 int err; 1174 1175 pbm->numa_node = of_node_to_nid(dp); 1176 1177 pbm->pci_ops = &sun4v_pci_ops; 1178 pbm->config_space_reg_bits = 12; 1179 1180 pbm->index = pci_num_pbms++; 1181 1182 pbm->op = op; 1183 1184 pbm->devhandle = devhandle; 1185 1186 pbm->name = dp->full_name; 1187 1188 printk("%s: SUN4V PCI Bus Module\n", pbm->name); 1189 printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node); 1190 1191 pci_determine_mem_io_space(pbm); 1192 1193 pci_get_pbm_props(pbm); 1194 1195 err = pci_sun4v_iommu_init(pbm); 1196 if (err) 1197 return err; 1198 1199 pci_sun4v_msi_init(pbm); 1200 1201 pci_sun4v_scan_bus(pbm, &op->dev); 1202 1203 /* if atu_init fails its not complete failure. 1204 * we can still continue using legacy iommu. 1205 */ 1206 if (pbm->iommu->atu) { 1207 err = pci_sun4v_atu_init(pbm); 1208 if (err) { 1209 kfree(pbm->iommu->atu); 1210 pbm->iommu->atu = NULL; 1211 pr_err(PFX "ATU init failed, err=%d\n", err); 1212 } 1213 } 1214 1215 pbm->next = pci_pbm_root; 1216 pci_pbm_root = pbm; 1217 1218 return 0; 1219 } 1220 1221 static int pci_sun4v_probe(struct platform_device *op) 1222 { 1223 const struct linux_prom64_registers *regs; 1224 static int hvapi_negotiated = 0; 1225 struct pci_pbm_info *pbm; 1226 struct device_node *dp; 1227 struct iommu *iommu; 1228 struct atu *atu; 1229 u32 devhandle; 1230 int i, err = -ENODEV; 1231 static bool hv_atu = true; 1232 1233 dp = op->dev.of_node; 1234 1235 if (!hvapi_negotiated++) { 1236 for (i = 0; i < ARRAY_SIZE(vpci_versions); i++) { 1237 vpci_major = vpci_versions[i].major; 1238 vpci_minor = vpci_versions[i].minor; 1239 1240 err = sun4v_hvapi_register(HV_GRP_PCI, vpci_major, 1241 &vpci_minor); 1242 if (!err) 1243 break; 1244 } 1245 1246 if (err) { 1247 pr_err(PFX "Could not register hvapi, err=%d\n", err); 1248 return err; 1249 } 1250 pr_info(PFX "Registered hvapi major[%lu] minor[%lu]\n", 1251 vpci_major, vpci_minor); 1252 1253 err = sun4v_hvapi_register(HV_GRP_ATU, vatu_major, &vatu_minor); 1254 if (err) { 1255 /* don't return an error if we fail to register the 1256 * ATU group, but ATU hcalls won't be available. 1257 */ 1258 hv_atu = false; 1259 } else { 1260 pr_info(PFX "Registered hvapi ATU major[%lu] minor[%lu]\n", 1261 vatu_major, vatu_minor); 1262 } 1263 1264 dma_ops = &sun4v_dma_ops; 1265 } 1266 1267 regs = of_get_property(dp, "reg", NULL); 1268 err = -ENODEV; 1269 if (!regs) { 1270 printk(KERN_ERR PFX "Could not find config registers\n"); 1271 goto out_err; 1272 } 1273 devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff; 1274 1275 err = -ENOMEM; 1276 if (!iommu_batch_initialized) { 1277 for_each_possible_cpu(i) { 1278 unsigned long page = get_zeroed_page(GFP_KERNEL); 1279 1280 if (!page) 1281 goto out_err; 1282 1283 per_cpu(iommu_batch, i).pglist = (u64 *) page; 1284 } 1285 iommu_batch_initialized = 1; 1286 } 1287 1288 pbm = kzalloc(sizeof(*pbm), GFP_KERNEL); 1289 if (!pbm) { 1290 printk(KERN_ERR PFX "Could not allocate pci_pbm_info\n"); 1291 goto out_err; 1292 } 1293 1294 iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL); 1295 if (!iommu) { 1296 printk(KERN_ERR PFX "Could not allocate pbm iommu\n"); 1297 goto out_free_controller; 1298 } 1299 1300 pbm->iommu = iommu; 1301 iommu->atu = NULL; 1302 if (hv_atu) { 1303 atu = kzalloc(sizeof(*atu), GFP_KERNEL); 1304 if (!atu) 1305 pr_err(PFX "Could not allocate atu\n"); 1306 else 1307 iommu->atu = atu; 1308 } 1309 1310 err = pci_sun4v_pbm_init(pbm, op, devhandle); 1311 if (err) 1312 goto out_free_iommu; 1313 1314 dev_set_drvdata(&op->dev, pbm); 1315 1316 return 0; 1317 1318 out_free_iommu: 1319 kfree(iommu->atu); 1320 kfree(pbm->iommu); 1321 1322 out_free_controller: 1323 kfree(pbm); 1324 1325 out_err: 1326 return err; 1327 } 1328 1329 static const struct of_device_id pci_sun4v_match[] = { 1330 { 1331 .name = "pci", 1332 .compatible = "SUNW,sun4v-pci", 1333 }, 1334 {}, 1335 }; 1336 1337 static struct platform_driver pci_sun4v_driver = { 1338 .driver = { 1339 .name = DRIVER_NAME, 1340 .of_match_table = pci_sun4v_match, 1341 }, 1342 .probe = pci_sun4v_probe, 1343 }; 1344 1345 static int __init pci_sun4v_init(void) 1346 { 1347 return platform_driver_register(&pci_sun4v_driver); 1348 } 1349 1350 subsys_initcall(pci_sun4v_init); 1351