git.oblomov.eu Git - linux-2.6/blob - arch/sparc64/kernel/pci_sun4v.c

   1 /* pci_sun4v.c: SUN4V specific PCI controller support.
   2  *
   3  * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/types.h>
   8 #include <linux/pci.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/percpu.h>
  13 #include <linux/irq.h>
  14 #include <linux/msi.h>
  15 #include <linux/log2.h>
  16
  17 #include <asm/iommu.h>
  18 #include <asm/irq.h>
  19 #include <asm/upa.h>
  20 #include <asm/pstate.h>
  21 #include <asm/oplib.h>
  22 #include <asm/hypervisor.h>
  23 #include <asm/prom.h>
  24
  25 #include "pci_impl.h"
  26 #include "iommu_common.h"
  27
  28 #include "pci_sun4v.h"
  29
  30 static unsigned long vpci_major = 1;
  31 static unsigned long vpci_minor = 1;
  32
  33 #define PGLIST_NENTS    (PAGE_SIZE / sizeof(u64))
  34
  35 struct iommu_batch {
  36         struct device   *dev;           /* Device mapping is for.       */
  37         unsigned long   prot;           /* IOMMU page protections       */
  38         unsigned long   entry;          /* Index into IOTSB.            */
  39         u64             *pglist;        /* List of physical pages       */
  40         unsigned long   npages;         /* Number of pages in list.     */
  41 };
  42
  43 static DEFINE_PER_CPU(struct iommu_batch, iommu_batch);
  44
  45 /* Interrupts must be disabled.  */
  46 static inline void iommu_batch_start(struct device *dev, unsigned long prot, unsigned long entry)
  47 {
  48         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
  49
  50         p->dev          = dev;
  51         p->prot         = prot;
  52         p->entry        = entry;
  53         p->npages       = 0;
  54 }
  55
  56 /* Interrupts must be disabled.  */
  57 static long iommu_batch_flush(struct iommu_batch *p)
  58 {
  59         struct pci_pbm_info *pbm = p->dev->archdata.host_controller;
  60         unsigned long devhandle = pbm->devhandle;
  61         unsigned long prot = p->prot;
  62         unsigned long entry = p->entry;
  63         u64 *pglist = p->pglist;
  64         unsigned long npages = p->npages;
  65
  66         while (npages != 0) {
  67                 long num;
  68
  69                 num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry),
  70                                           npages, prot, __pa(pglist));
  71                 if (unlikely(num < 0)) {
  72                         if (printk_ratelimit())
  73                                 printk("iommu_batch_flush: IOMMU map of "
  74                                        "[%08lx:%08lx:%lx:%lx:%lx] failed with "
  75                                        "status %ld\n",
  76                                        devhandle, HV_PCI_TSBID(0, entry),
  77                                        npages, prot, __pa(pglist), num);
  78                         return -1;
  79                 }
  80
  81                 entry += num;
  82                 npages -= num;
  83                 pglist += num;
  84         }
  85
  86         p->entry = entry;
  87         p->npages = 0;
  88
  89         return 0;
  90 }
  91
  92 /* Interrupts must be disabled.  */
  93 static inline long iommu_batch_add(u64 phys_page)
  94 {
  95         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
  96
  97         BUG_ON(p->npages >= PGLIST_NENTS);
  98
  99         p->pglist[p->npages++] = phys_page;
 100         if (p->npages == PGLIST_NENTS)
 101                 return iommu_batch_flush(p);
 102
 103         return 0;
 104 }
 105
 106 /* Interrupts must be disabled.  */
 107 static inline long iommu_batch_end(void)
 108 {
 109         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
 110
 111         BUG_ON(p->npages >= PGLIST_NENTS);
 112
 113         return iommu_batch_flush(p);
 114 }
 115
 116 static long arena_alloc(struct iommu_arena *arena, unsigned long npages)
 117 {
 118         unsigned long n, i, start, end, limit;
 119         int pass;
 120
 121         limit = arena->limit;
 122         start = arena->hint;
 123         pass = 0;
 124
 125 again:
 126         n = find_next_zero_bit(arena->map, limit, start);
 127         end = n + npages;
 128         if (unlikely(end >= limit)) {
 129                 if (likely(pass < 1)) {
 130                         limit = start;
 131                         start = 0;
 132                         pass++;
 133                         goto again;
 134                 } else {
 135                         /* Scanned the whole thing, give up. */
 136                         return -1;
 137                 }
 138         }
 139
 140         for (i = n; i < end; i++) {
 141                 if (test_bit(i, arena->map)) {
 142                         start = i + 1;
 143                         goto again;
 144                 }
 145         }
 146
 147         for (i = n; i < end; i++)
 148                 __set_bit(i, arena->map);
 149
 150         arena->hint = end;
 151
 152         return n;
 153 }
 154
 155 static void arena_free(struct iommu_arena *arena, unsigned long base,
 156                        unsigned long npages)
 157 {
 158         unsigned long i;
 159
 160         for (i = base; i < (base + npages); i++)
 161                 __clear_bit(i, arena->map);
 162 }
 163
 164 static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
 165                                    dma_addr_t *dma_addrp, gfp_t gfp)
 166 {
 167         struct iommu *iommu;
 168         unsigned long flags, order, first_page, npages, n;
 169         void *ret;
 170         long entry;
 171
 172         size = IO_PAGE_ALIGN(size);
 173         order = get_order(size);
 174         if (unlikely(order >= MAX_ORDER))
 175                 return NULL;
 176
 177         npages = size >> IO_PAGE_SHIFT;
 178
 179         first_page = __get_free_pages(gfp, order);
 180         if (unlikely(first_page == 0UL))
 181                 return NULL;
 182
 183         memset((char *)first_page, 0, PAGE_SIZE << order);
 184
 185         iommu = dev->archdata.iommu;
 186
 187         spin_lock_irqsave(&iommu->lock, flags);
 188         entry = arena_alloc(&iommu->arena, npages);
 189         spin_unlock_irqrestore(&iommu->lock, flags);
 190
 191         if (unlikely(entry < 0L))
 192                 goto arena_alloc_fail;
 193
 194         *dma_addrp = (iommu->page_table_map_base +
 195                       (entry << IO_PAGE_SHIFT));
 196         ret = (void *) first_page;
 197         first_page = __pa(first_page);
 198
 199         local_irq_save(flags);
 200
 201         iommu_batch_start(dev,
 202                           (HV_PCI_MAP_ATTR_READ |
 203                            HV_PCI_MAP_ATTR_WRITE),
 204                           entry);
 205
 206         for (n = 0; n < npages; n++) {
 207                 long err = iommu_batch_add(first_page + (n * PAGE_SIZE));
 208                 if (unlikely(err < 0L))
 209                         goto iommu_map_fail;
 210         }
 211
 212         if (unlikely(iommu_batch_end() < 0L))
 213                 goto iommu_map_fail;
 214
 215         local_irq_restore(flags);
 216
 217         return ret;
 218
 219 iommu_map_fail:
 220         /* Interrupts are disabled.  */
 221         spin_lock(&iommu->lock);
 222         arena_free(&iommu->arena, entry, npages);
 223         spin_unlock_irqrestore(&iommu->lock, flags);
 224
 225 arena_alloc_fail:
 226         free_pages(first_page, order);
 227         return NULL;
 228 }
 229
 230 static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
 231                                  dma_addr_t dvma)
 232 {
 233         struct pci_pbm_info *pbm;
 234         struct iommu *iommu;
 235         unsigned long flags, order, npages, entry;
 236         u32 devhandle;
 237
 238         npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
 239         iommu = dev->archdata.iommu;
 240         pbm = dev->archdata.host_controller;
 241         devhandle = pbm->devhandle;
 242         entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 243
 244         spin_lock_irqsave(&iommu->lock, flags);
 245
 246         arena_free(&iommu->arena, entry, npages);
 247
 248         do {
 249                 unsigned long num;
 250
 251                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 252                                             npages);
 253                 entry += num;
 254                 npages -= num;
 255         } while (npages != 0);
 256
 257         spin_unlock_irqrestore(&iommu->lock, flags);
 258
 259         order = get_order(size);
 260         if (order < 10)
 261                 free_pages((unsigned long)cpu, order);
 262 }
 263
 264 static dma_addr_t dma_4v_map_single(struct device *dev, void *ptr, size_t sz,
 265                                     enum dma_data_direction direction)
 266 {
 267         struct iommu *iommu;
 268         unsigned long flags, npages, oaddr;
 269         unsigned long i, base_paddr;
 270         u32 bus_addr, ret;
 271         unsigned long prot;
 272         long entry;
 273
 274         iommu = dev->archdata.iommu;
 275
 276         if (unlikely(direction == DMA_NONE))
 277                 goto bad;
 278
 279         oaddr = (unsigned long)ptr;
 280         npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
 281         npages >>= IO_PAGE_SHIFT;
 282
 283         spin_lock_irqsave(&iommu->lock, flags);
 284         entry = arena_alloc(&iommu->arena, npages);
 285         spin_unlock_irqrestore(&iommu->lock, flags);
 286
 287         if (unlikely(entry < 0L))
 288                 goto bad;
 289
 290         bus_addr = (iommu->page_table_map_base +
 291                     (entry << IO_PAGE_SHIFT));
 292         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
 293         base_paddr = __pa(oaddr & IO_PAGE_MASK);
 294         prot = HV_PCI_MAP_ATTR_READ;
 295         if (direction != DMA_TO_DEVICE)
 296                 prot |= HV_PCI_MAP_ATTR_WRITE;
 297
 298         local_irq_save(flags);
 299
 300         iommu_batch_start(dev, prot, entry);
 301
 302         for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
 303                 long err = iommu_batch_add(base_paddr);
 304                 if (unlikely(err < 0L))
 305                         goto iommu_map_fail;
 306         }
 307         if (unlikely(iommu_batch_end() < 0L))
 308                 goto iommu_map_fail;
 309
 310         local_irq_restore(flags);
 311
 312         return ret;
 313
 314 bad:
 315         if (printk_ratelimit())
 316                 WARN_ON(1);
 317         return DMA_ERROR_CODE;
 318
 319 iommu_map_fail:
 320         /* Interrupts are disabled.  */
 321         spin_lock(&iommu->lock);
 322         arena_free(&iommu->arena, entry, npages);
 323         spin_unlock_irqrestore(&iommu->lock, flags);
 324
 325         return DMA_ERROR_CODE;
 326 }
 327
 328 static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
 329                                 size_t sz, enum dma_data_direction direction)
 330 {
 331         struct pci_pbm_info *pbm;
 332         struct iommu *iommu;
 333         unsigned long flags, npages;
 334         long entry;
 335         u32 devhandle;
 336
 337         if (unlikely(direction == DMA_NONE)) {
 338                 if (printk_ratelimit())
 339                         WARN_ON(1);
 340                 return;
 341         }
 342
 343         iommu = dev->archdata.iommu;
 344         pbm = dev->archdata.host_controller;
 345         devhandle = pbm->devhandle;
 346
 347         npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
 348         npages >>= IO_PAGE_SHIFT;
 349         bus_addr &= IO_PAGE_MASK;
 350
 351         spin_lock_irqsave(&iommu->lock, flags);
 352
 353         entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
 354         arena_free(&iommu->arena, entry, npages);
 355
 356         do {
 357                 unsigned long num;
 358
 359                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 360                                             npages);
 361                 entry += num;
 362                 npages -= num;
 363         } while (npages != 0);
 364
 365         spin_unlock_irqrestore(&iommu->lock, flags);
 366 }
 367
 368 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 369                          int nelems, enum dma_data_direction direction)
 370 {
 371         unsigned long flags, npages, i, prot;
 372         struct scatterlist *sg;
 373         struct iommu *iommu;
 374         long entry, err;
 375         u32 dma_base;
 376
 377         /* Fast path single entry scatterlists. */
 378         if (nelems == 1) {
 379                 sglist->dma_address =
 380                         dma_4v_map_single(dev, sg_virt(sglist),
 381                                           sglist->length, direction);
 382                 if (unlikely(sglist->dma_address == DMA_ERROR_CODE))
 383                         return 0;
 384                 sglist->dma_length = sglist->length;
 385                 return 1;
 386         }
 387
 388         iommu = dev->archdata.iommu;
 389
 390         if (unlikely(direction == DMA_NONE))
 391                 goto bad;
 392
 393         npages = calc_npages(sglist, nelems);
 394
 395         spin_lock_irqsave(&iommu->lock, flags);
 396         entry = arena_alloc(&iommu->arena, npages);
 397         spin_unlock_irqrestore(&iommu->lock, flags);
 398
 399         if (unlikely(entry < 0L))
 400                 goto bad;
 401
 402         dma_base = iommu->page_table_map_base +
 403                 (entry << IO_PAGE_SHIFT);
 404
 405         prot = HV_PCI_MAP_ATTR_READ;
 406         if (direction != DMA_TO_DEVICE)
 407                 prot |= HV_PCI_MAP_ATTR_WRITE;
 408
 409         local_irq_save(flags);
 410
 411         iommu_batch_start(dev, prot, entry);
 412
 413         for_each_sg(sglist, sg, nelems, i) {
 414                 unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
 415                 unsigned long slen = sg->length;
 416                 unsigned long this_npages;
 417
 418                 this_npages = iommu_num_pages(paddr, slen);
 419
 420                 sg->dma_address = dma_base | (paddr & ~IO_PAGE_MASK);
 421                 sg->dma_length = slen;
 422
 423                 paddr &= IO_PAGE_MASK;
 424                 while (this_npages--) {
 425                         err = iommu_batch_add(paddr);
 426                         if (unlikely(err < 0L)) {
 427                                 local_irq_restore(flags);
 428                                 goto iommu_map_failed;
 429                         }
 430
 431                         paddr += IO_PAGE_SIZE;
 432                         dma_base += IO_PAGE_SIZE;
 433                 }
 434         }
 435
 436         err = iommu_batch_end();
 437
 438         local_irq_restore(flags);
 439
 440         if (unlikely(err < 0L))
 441                 goto iommu_map_failed;
 442
 443         return nelems;
 444
 445 bad:
 446         if (printk_ratelimit())
 447                 WARN_ON(1);
 448         return 0;
 449
 450 iommu_map_failed:
 451         spin_lock_irqsave(&iommu->lock, flags);
 452         arena_free(&iommu->arena, entry, npages);
 453         spin_unlock_irqrestore(&iommu->lock, flags);
 454
 455         return 0;
 456 }
 457
 458 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
 459                             int nelems, enum dma_data_direction direction)
 460 {
 461         unsigned long flags, npages;
 462         struct pci_pbm_info *pbm;
 463         u32 devhandle, bus_addr;
 464         struct iommu *iommu;
 465         long entry;
 466
 467         if (unlikely(direction == DMA_NONE)) {
 468                 if (printk_ratelimit())
 469                         WARN_ON(1);
 470         }
 471
 472         iommu = dev->archdata.iommu;
 473         pbm = dev->archdata.host_controller;
 474         devhandle = pbm->devhandle;
 475
 476         bus_addr = sglist->dma_address & IO_PAGE_MASK;
 477
 478         npages = calc_npages(sglist, nelems);
 479
 480         entry = ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 481
 482         spin_lock_irqsave(&iommu->lock, flags);
 483
 484         arena_free(&iommu->arena, entry, npages);
 485
 486         do {
 487                 unsigned long num;
 488
 489                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 490                                             npages);
 491                 entry += num;
 492                 npages -= num;
 493         } while (npages != 0);
 494
 495         spin_unlock_irqrestore(&iommu->lock, flags);
 496 }
 497
 498 static void dma_4v_sync_single_for_cpu(struct device *dev,
 499                                        dma_addr_t bus_addr, size_t sz,
 500                                        enum dma_data_direction direction)
 501 {
 502         /* Nothing to do... */
 503 }
 504
 505 static void dma_4v_sync_sg_for_cpu(struct device *dev,
 506                                    struct scatterlist *sglist, int nelems,
 507                                    enum dma_data_direction direction)
 508 {
 509         /* Nothing to do... */
 510 }
 511
 512 const struct dma_ops sun4v_dma_ops = {
 513         .alloc_coherent                 = dma_4v_alloc_coherent,
 514         .free_coherent                  = dma_4v_free_coherent,
 515         .map_single                     = dma_4v_map_single,
 516         .unmap_single                   = dma_4v_unmap_single,
 517         .map_sg                         = dma_4v_map_sg,
 518         .unmap_sg                       = dma_4v_unmap_sg,
 519         .sync_single_for_cpu            = dma_4v_sync_single_for_cpu,
 520         .sync_sg_for_cpu                = dma_4v_sync_sg_for_cpu,
 521 };
 522
 523 static void __init pci_sun4v_scan_bus(struct pci_pbm_info *pbm)
 524 {
 525         struct property *prop;
 526         struct device_node *dp;
 527
 528         dp = pbm->prom_node;
 529         prop = of_find_property(dp, "66mhz-capable", NULL);
 530         pbm->is_66mhz_capable = (prop != NULL);
 531         pbm->pci_bus = pci_scan_one_pbm(pbm);
 532
 533         /* XXX register error interrupt handlers XXX */
 534 }
 535
 536 static unsigned long __init probe_existing_entries(struct pci_pbm_info *pbm,
 537                                                    struct iommu *iommu)
 538 {
 539         struct iommu_arena *arena = &iommu->arena;
 540         unsigned long i, cnt = 0;
 541         u32 devhandle;
 542
 543         devhandle = pbm->devhandle;
 544         for (i = 0; i < arena->limit; i++) {
 545                 unsigned long ret, io_attrs, ra;
 546
 547                 ret = pci_sun4v_iommu_getmap(devhandle,
 548                                              HV_PCI_TSBID(0, i),
 549                                              &io_attrs, &ra);
 550                 if (ret == HV_EOK) {
 551                         if (page_in_phys_avail(ra)) {
 552                                 pci_sun4v_iommu_demap(devhandle,
 553                                                       HV_PCI_TSBID(0, i), 1);
 554                         } else {
 555                                 cnt++;
 556                                 __set_bit(i, arena->map);
 557                         }
 558                 }
 559         }
 560
 561         return cnt;
 562 }
 563
 564 static void __init pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 565 {
 566         struct iommu *iommu = pbm->iommu;
 567         struct property *prop;
 568         unsigned long num_tsb_entries, sz, tsbsize;
 569         u32 vdma[2], dma_mask, dma_offset;
 570
 571         prop = of_find_property(pbm->prom_node, "virtual-dma", NULL);
 572         if (prop) {
 573                 u32 *val = prop->value;
 574
 575                 vdma[0] = val[0];
 576                 vdma[1] = val[1];
 577         } else {
 578                 /* No property, use default values. */
 579                 vdma[0] = 0x80000000;
 580                 vdma[1] = 0x80000000;
 581         }
 582
 583         if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
 584                 prom_printf("PCI-SUN4V: strange virtual-dma[%08x:%08x].\n",
 585                             vdma[0], vdma[1]);
 586                 prom_halt();
 587         };
 588
 589         dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
 590         num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
 591         tsbsize = num_tsb_entries * sizeof(iopte_t);
 592
 593         dma_offset = vdma[0];
 594
 595         /* Setup initial software IOMMU state. */
 596         spin_lock_init(&iommu->lock);
 597         iommu->ctx_lowest_free = 1;
 598         iommu->page_table_map_base = dma_offset;
 599         iommu->dma_addr_mask = dma_mask;
 600
 601         /* Allocate and initialize the free area map.  */
 602         sz = (num_tsb_entries + 7) / 8;
 603         sz = (sz + 7UL) & ~7UL;
 604         iommu->arena.map = kzalloc(sz, GFP_KERNEL);
 605         if (!iommu->arena.map) {
 606                 prom_printf("PCI_IOMMU: Error, kmalloc(arena.map) failed.\n");
 607                 prom_halt();
 608         }
 609         iommu->arena.limit = num_tsb_entries;
 610
 611         sz = probe_existing_entries(pbm, iommu);
 612         if (sz)
 613                 printk("%s: Imported %lu TSB entries from OBP\n",
 614                        pbm->name, sz);
 615 }
 616
 617 #ifdef CONFIG_PCI_MSI
 618 struct pci_sun4v_msiq_entry {
 619         u64             version_type;
 620 #define MSIQ_VERSION_MASK               0xffffffff00000000UL
 621 #define MSIQ_VERSION_SHIFT              32
 622 #define MSIQ_TYPE_MASK                  0x00000000000000ffUL
 623 #define MSIQ_TYPE_SHIFT                 0
 624 #define MSIQ_TYPE_NONE                  0x00
 625 #define MSIQ_TYPE_MSG                   0x01
 626 #define MSIQ_TYPE_MSI32                 0x02
 627 #define MSIQ_TYPE_MSI64                 0x03
 628 #define MSIQ_TYPE_INTX                  0x08
 629 #define MSIQ_TYPE_NONE2                 0xff
 630
 631         u64             intx_sysino;
 632         u64             reserved1;
 633         u64             stick;
 634         u64             req_id;  /* bus/device/func */
 635 #define MSIQ_REQID_BUS_MASK             0xff00UL
 636 #define MSIQ_REQID_BUS_SHIFT            8
 637 #define MSIQ_REQID_DEVICE_MASK          0x00f8UL
 638 #define MSIQ_REQID_DEVICE_SHIFT         3
 639 #define MSIQ_REQID_FUNC_MASK            0x0007UL
 640 #define MSIQ_REQID_FUNC_SHIFT           0
 641
 642         u64             msi_address;
 643
 644         /* The format of this value is message type dependent.
 645          * For MSI bits 15:0 are the data from the MSI packet.
 646          * For MSI-X bits 31:0 are the data from the MSI packet.
 647          * For MSG, the message code and message routing code where:
 648          *      bits 39:32 is the bus/device/fn of the msg target-id
 649          *      bits 18:16 is the message routing code
 650          *      bits 7:0 is the message code
 651          * For INTx the low order 2-bits are:
 652          *      00 - INTA
 653          *      01 - INTB
 654          *      10 - INTC
 655          *      11 - INTD
 656          */
 657         u64             msi_data;
 658
 659         u64             reserved2;
 660 };
 661
 662 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 663                               unsigned long *head)
 664 {
 665         unsigned long err, limit;
 666
 667         err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head);
 668         if (unlikely(err))
 669                 return -ENXIO;
 670
 671         limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 672         if (unlikely(*head >= limit))
 673                 return -EFBIG;
 674
 675         return 0;
 676 }
 677
 678 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm,
 679                                  unsigned long msiqid, unsigned long *head,
 680                                  unsigned long *msi)
 681 {
 682         struct pci_sun4v_msiq_entry *ep;
 683         unsigned long err, type;
 684
 685         /* Note: void pointer arithmetic, 'head' is a byte offset  */
 686         ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) *
 687                                  (pbm->msiq_ent_count *
 688                                   sizeof(struct pci_sun4v_msiq_entry))) +
 689               *head);
 690
 691         if ((ep->version_type & MSIQ_TYPE_MASK) == 0)
 692                 return 0;
 693
 694         type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT;
 695         if (unlikely(type != MSIQ_TYPE_MSI32 &&
 696                      type != MSIQ_TYPE_MSI64))
 697                 return -EINVAL;
 698
 699         *msi = ep->msi_data;
 700
 701         err = pci_sun4v_msi_setstate(pbm->devhandle,
 702                                      ep->msi_data /* msi_num */,
 703                                      HV_MSISTATE_IDLE);
 704         if (unlikely(err))
 705                 return -ENXIO;
 706
 707         /* Clear the entry.  */
 708         ep->version_type &= ~MSIQ_TYPE_MASK;
 709
 710         (*head) += sizeof(struct pci_sun4v_msiq_entry);
 711         if (*head >=
 712             (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry)))
 713                 *head = 0;
 714
 715         return 1;
 716 }
 717
 718 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 719                               unsigned long head)
 720 {
 721         unsigned long err;
 722
 723         err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head);
 724         if (unlikely(err))
 725                 return -EINVAL;
 726
 727         return 0;
 728 }
 729
 730 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
 731                                unsigned long msi, int is_msi64)
 732 {
 733         if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid,
 734                                   (is_msi64 ?
 735                                    HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32)))
 736                 return -ENXIO;
 737         if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE))
 738                 return -ENXIO;
 739         if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID))
 740                 return -ENXIO;
 741         return 0;
 742 }
 743
 744 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
 745 {
 746         unsigned long err, msiqid;
 747
 748         err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid);
 749         if (err)
 750                 return -ENXIO;
 751
 752         pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID);
 753
 754         return 0;
 755 }
 756
 757 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm)
 758 {
 759         unsigned long q_size, alloc_size, pages, order;
 760         int i;
 761
 762         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 763         alloc_size = (pbm->msiq_num * q_size);
 764         order = get_order(alloc_size);
 765         pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
 766         if (pages == 0UL) {
 767                 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
 768                        order);
 769                 return -ENOMEM;
 770         }
 771         memset((char *)pages, 0, PAGE_SIZE << order);
 772         pbm->msi_queues = (void *) pages;
 773
 774         for (i = 0; i < pbm->msiq_num; i++) {
 775                 unsigned long err, base = __pa(pages + (i * q_size));
 776                 unsigned long ret1, ret2;
 777
 778                 err = pci_sun4v_msiq_conf(pbm->devhandle,
 779                                           pbm->msiq_first + i,
 780                                           base, pbm->msiq_ent_count);
 781                 if (err) {
 782                         printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n",
 783                                err);
 784                         goto h_error;
 785                 }
 786
 787                 err = pci_sun4v_msiq_info(pbm->devhandle,
 788                                           pbm->msiq_first + i,
 789                                           &ret1, &ret2);
 790                 if (err) {
 791                         printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n",
 792                                err);
 793                         goto h_error;
 794                 }
 795                 if (ret1 != base || ret2 != pbm->msiq_ent_count) {
 796                         printk(KERN_ERR "MSI: Bogus qconf "
 797                                "expected[%lx:%x] got[%lx:%lx]\n",
 798                                base, pbm->msiq_ent_count,
 799                                ret1, ret2);
 800                         goto h_error;
 801                 }
 802         }
 803
 804         return 0;
 805
 806 h_error:
 807         free_pages(pages, order);
 808         return -EINVAL;
 809 }
 810
 811 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm)
 812 {
 813         unsigned long q_size, alloc_size, pages, order;
 814         int i;
 815
 816         for (i = 0; i < pbm->msiq_num; i++) {
 817                 unsigned long msiqid = pbm->msiq_first + i;
 818
 819                 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0);
 820         }
 821
 822         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 823         alloc_size = (pbm->msiq_num * q_size);
 824         order = get_order(alloc_size);
 825
 826         pages = (unsigned long) pbm->msi_queues;
 827
 828         free_pages(pages, order);
 829
 830         pbm->msi_queues = NULL;
 831 }
 832
 833 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm,
 834                                     unsigned long msiqid,
 835                                     unsigned long devino)
 836 {
 837         unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino);
 838
 839         if (!virt_irq)
 840                 return -ENOMEM;
 841
 842         if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE))
 843                 return -EINVAL;
 844         if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID))
 845                 return -EINVAL;
 846
 847         return virt_irq;
 848 }
 849
 850 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = {
 851         .get_head       =       pci_sun4v_get_head,
 852         .dequeue_msi    =       pci_sun4v_dequeue_msi,
 853         .set_head       =       pci_sun4v_set_head,
 854         .msi_setup      =       pci_sun4v_msi_setup,
 855         .msi_teardown   =       pci_sun4v_msi_teardown,
 856         .msiq_alloc     =       pci_sun4v_msiq_alloc,
 857         .msiq_free      =       pci_sun4v_msiq_free,
 858         .msiq_build_irq =       pci_sun4v_msiq_build_irq,
 859 };
 860
 861 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 862 {
 863         sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops);
 864 }
 865 #else /* CONFIG_PCI_MSI */
 866 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 867 {
 868 }
 869 #endif /* !(CONFIG_PCI_MSI) */
 870
 871 static void __init pci_sun4v_pbm_init(struct pci_controller_info *p,
 872                                       struct device_node *dp, u32 devhandle)
 873 {
 874         struct pci_pbm_info *pbm;
 875
 876         if (devhandle & 0x40)
 877                 pbm = &p->pbm_B;
 878         else
 879                 pbm = &p->pbm_A;
 880
 881         pbm->next = pci_pbm_root;
 882         pci_pbm_root = pbm;
 883
 884         pbm->scan_bus = pci_sun4v_scan_bus;
 885         pbm->pci_ops = &sun4v_pci_ops;
 886         pbm->config_space_reg_bits = 12;
 887
 888         pbm->index = pci_num_pbms++;
 889
 890         pbm->parent = p;
 891         pbm->prom_node = dp;
 892
 893         pbm->devhandle = devhandle;
 894
 895         pbm->name = dp->full_name;
 896
 897         printk("%s: SUN4V PCI Bus Module\n", pbm->name);
 898
 899         pci_determine_mem_io_space(pbm);
 900
 901         pci_get_pbm_props(pbm);
 902         pci_sun4v_iommu_init(pbm);
 903         pci_sun4v_msi_init(pbm);
 904 }
 905
 906 void __init sun4v_pci_init(struct device_node *dp, char *model_name)
 907 {
 908         static int hvapi_negotiated = 0;
 909         struct pci_controller_info *p;
 910         struct pci_pbm_info *pbm;
 911         struct iommu *iommu;
 912         struct property *prop;
 913         struct linux_prom64_registers *regs;
 914         u32 devhandle;
 915         int i;
 916
 917         if (!hvapi_negotiated++) {
 918                 int err = sun4v_hvapi_register(HV_GRP_PCI,
 919                                                vpci_major,
 920                                                &vpci_minor);
 921
 922                 if (err) {
 923                         prom_printf("SUN4V_PCI: Could not register hvapi, "
 924                                     "err=%d\n", err);
 925                         prom_halt();
 926                 }
 927                 printk("SUN4V_PCI: Registered hvapi major[%lu] minor[%lu]\n",
 928                        vpci_major, vpci_minor);
 929
 930                 dma_ops = &sun4v_dma_ops;
 931         }
 932
 933         prop = of_find_property(dp, "reg", NULL);
 934         if (!prop) {
 935                 prom_printf("SUN4V_PCI: Could not find config registers\n");
 936                 prom_halt();
 937         }
 938         regs = prop->value;
 939
 940         devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
 941
 942         for (pbm = pci_pbm_root; pbm; pbm = pbm->next) {
 943                 if (pbm->devhandle == (devhandle ^ 0x40)) {
 944                         pci_sun4v_pbm_init(pbm->parent, dp, devhandle);
 945                         return;
 946                 }
 947         }
 948
 949         for_each_possible_cpu(i) {
 950                 unsigned long page = get_zeroed_page(GFP_ATOMIC);
 951
 952                 if (!page)
 953                         goto fatal_memory_error;
 954
 955                 per_cpu(iommu_batch, i).pglist = (u64 *) page;
 956         }
 957
 958         p = kzalloc(sizeof(struct pci_controller_info), GFP_ATOMIC);
 959         if (!p)
 960                 goto fatal_memory_error;
 961
 962         iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
 963         if (!iommu)
 964                 goto fatal_memory_error;
 965
 966         p->pbm_A.iommu = iommu;
 967
 968         iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
 969         if (!iommu)
 970                 goto fatal_memory_error;
 971
 972         p->pbm_B.iommu = iommu;
 973
 974         pci_sun4v_pbm_init(p, dp, devhandle);
 975         return;
 976
 977 fatal_memory_error:
 978         prom_printf("SUN4V_PCI: Fatal memory allocation error.\n");
 979         prom_halt();
 980 }