arch/sparc/kernel/pci_sun4v.c

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