arch/sparc/kernel/pci_sun4v.c

   1 /* pci_sun4v.c: SUN4V specific PCI controller support.
   2  *
   3  * Copyright (C) 2006, 2007, 2008 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 #include <linux/of_device.h>
  17
  18 #include <asm/iommu.h>
  19 #include <asm/irq.h>
  20 #include <asm/hypervisor.h>
  21 #include <asm/prom.h>
  22
  23 #include "pci_impl.h"
  24 #include "iommu_common.h"
  25
  26 #include "pci_sun4v.h"
  27
  28 #define DRIVER_NAME     "pci_sun4v"
  29 #define PFX             DRIVER_NAME ": "
  30
  31 static unsigned long vpci_major = 1;
  32 static unsigned long vpci_minor = 1;
  33
  34 #define PGLIST_NENTS    (PAGE_SIZE / sizeof(u64))
  35
  36 struct iommu_batch {
  37         struct device   *dev;           /* Device mapping is for.       */
  38         unsigned long   prot;           /* IOMMU page protections       */
  39         unsigned long   entry;          /* Index into IOTSB.            */
  40         u64             *pglist;        /* List of physical pages       */
  41         unsigned long   npages;         /* Number of pages in list.     */
  42 };
  43
  44 static DEFINE_PER_CPU(struct iommu_batch, iommu_batch);
  45 static int iommu_batch_initialized;
  46
  47 /* Interrupts must be disabled.  */
  48 static inline void iommu_batch_start(struct device *dev, unsigned long prot, unsigned long entry)
  49 {
  50         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
  51
  52         p->dev          = dev;
  53         p->prot         = prot;
  54         p->entry        = entry;
  55         p->npages       = 0;
  56 }
  57
  58 /* Interrupts must be disabled.  */
  59 static long iommu_batch_flush(struct iommu_batch *p)
  60 {
  61         struct pci_pbm_info *pbm = p->dev->archdata.host_controller;
  62         unsigned long devhandle = pbm->devhandle;
  63         unsigned long prot = p->prot;
  64         unsigned long entry = p->entry;
  65         u64 *pglist = p->pglist;
  66         unsigned long npages = p->npages;
  67
  68         while (npages != 0) {
  69                 long num;
  70
  71                 num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry),
  72                                           npages, prot, __pa(pglist));
  73                 if (unlikely(num < 0)) {
  74                         if (printk_ratelimit())
  75                                 printk("iommu_batch_flush: IOMMU map of "
  76                                        "[%08lx:%08llx:%lx:%lx:%lx] failed with "
  77                                        "status %ld\n",
  78                                        devhandle, HV_PCI_TSBID(0, entry),
  79                                        npages, prot, __pa(pglist), num);
  80                         return -1;
  81                 }
  82
  83                 entry += num;
  84                 npages -= num;
  85                 pglist += num;
  86         }
  87
  88         p->entry = entry;
  89         p->npages = 0;
  90
  91         return 0;
  92 }
  93
  94 static inline void iommu_batch_new_entry(unsigned long entry)
  95 {
  96         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
  97
  98         if (p->entry + p->npages == entry)
  99                 return;
 100         if (p->entry != ~0UL)
 101                 iommu_batch_flush(p);
 102         p->entry = entry;
 103 }
 104
 105 /* Interrupts must be disabled.  */
 106 static inline long iommu_batch_add(u64 phys_page)
 107 {
 108         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
 109
 110         BUG_ON(p->npages >= PGLIST_NENTS);
 111
 112         p->pglist[p->npages++] = phys_page;
 113         if (p->npages == PGLIST_NENTS)
 114                 return iommu_batch_flush(p);
 115
 116         return 0;
 117 }
 118
 119 /* Interrupts must be disabled.  */
 120 static inline long iommu_batch_end(void)
 121 {
 122         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
 123
 124         BUG_ON(p->npages >= PGLIST_NENTS);
 125
 126         return iommu_batch_flush(p);
 127 }
 128
 129 static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
 130                                    dma_addr_t *dma_addrp, gfp_t gfp)
 131 {
 132         unsigned long flags, order, first_page, npages, n;
 133         struct iommu *iommu;
 134         struct page *page;
 135         void *ret;
 136         long entry;
 137         int nid;
 138
 139         size = IO_PAGE_ALIGN(size);
 140         order = get_order(size);
 141         if (unlikely(order >= MAX_ORDER))
 142                 return NULL;
 143
 144         npages = size >> IO_PAGE_SHIFT;
 145
 146         nid = dev->archdata.numa_node;
 147         page = alloc_pages_node(nid, gfp, order);
 148         if (unlikely(!page))
 149                 return NULL;
 150
 151         first_page = (unsigned long) page_address(page);
 152         memset((char *)first_page, 0, PAGE_SIZE << order);
 153
 154         iommu = dev->archdata.iommu;
 155
 156         spin_lock_irqsave(&iommu->lock, flags);
 157         entry = iommu_range_alloc(dev, iommu, npages, NULL);
 158         spin_unlock_irqrestore(&iommu->lock, flags);
 159
 160         if (unlikely(entry == DMA_ERROR_CODE))
 161                 goto range_alloc_fail;
 162
 163         *dma_addrp = (iommu->page_table_map_base +
 164                       (entry << IO_PAGE_SHIFT));
 165         ret = (void *) first_page;
 166         first_page = __pa(first_page);
 167
 168         local_irq_save(flags);
 169
 170         iommu_batch_start(dev,
 171                           (HV_PCI_MAP_ATTR_READ |
 172                            HV_PCI_MAP_ATTR_WRITE),
 173                           entry);
 174
 175         for (n = 0; n < npages; n++) {
 176                 long err = iommu_batch_add(first_page + (n * PAGE_SIZE));
 177                 if (unlikely(err < 0L))
 178                         goto iommu_map_fail;
 179         }
 180
 181         if (unlikely(iommu_batch_end() < 0L))
 182                 goto iommu_map_fail;
 183
 184         local_irq_restore(flags);
 185
 186         return ret;
 187
 188 iommu_map_fail:
 189         /* Interrupts are disabled.  */
 190         spin_lock(&iommu->lock);
 191         iommu_range_free(iommu, *dma_addrp, npages);
 192         spin_unlock_irqrestore(&iommu->lock, flags);
 193
 194 range_alloc_fail:
 195         free_pages(first_page, order);
 196         return NULL;
 197 }
 198
 199 static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
 200                                  dma_addr_t dvma)
 201 {
 202         struct pci_pbm_info *pbm;
 203         struct iommu *iommu;
 204         unsigned long flags, order, npages, entry;
 205         u32 devhandle;
 206
 207         npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
 208         iommu = dev->archdata.iommu;
 209         pbm = dev->archdata.host_controller;
 210         devhandle = pbm->devhandle;
 211         entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 212
 213         spin_lock_irqsave(&iommu->lock, flags);
 214
 215         iommu_range_free(iommu, dvma, npages);
 216
 217         do {
 218                 unsigned long num;
 219
 220                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 221                                             npages);
 222                 entry += num;
 223                 npages -= num;
 224         } while (npages != 0);
 225
 226         spin_unlock_irqrestore(&iommu->lock, flags);
 227
 228         order = get_order(size);
 229         if (order < 10)
 230                 free_pages((unsigned long)cpu, order);
 231 }
 232
 233 static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page,
 234                                   unsigned long offset, size_t sz,
 235                                   enum dma_data_direction direction,
 236                                   struct dma_attrs *attrs)
 237 {
 238         struct iommu *iommu;
 239         unsigned long flags, npages, oaddr;
 240         unsigned long i, base_paddr;
 241         u32 bus_addr, ret;
 242         unsigned long prot;
 243         long entry;
 244
 245         iommu = dev->archdata.iommu;
 246
 247         if (unlikely(direction == DMA_NONE))
 248                 goto bad;
 249
 250         oaddr = (unsigned long)(page_address(page) + offset);
 251         npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
 252         npages >>= IO_PAGE_SHIFT;
 253
 254         spin_lock_irqsave(&iommu->lock, flags);
 255         entry = iommu_range_alloc(dev, iommu, npages, NULL);
 256         spin_unlock_irqrestore(&iommu->lock, flags);
 257
 258         if (unlikely(entry == DMA_ERROR_CODE))
 259                 goto bad;
 260
 261         bus_addr = (iommu->page_table_map_base +
 262                     (entry << IO_PAGE_SHIFT));
 263         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
 264         base_paddr = __pa(oaddr & IO_PAGE_MASK);
 265         prot = HV_PCI_MAP_ATTR_READ;
 266         if (direction != DMA_TO_DEVICE)
 267                 prot |= HV_PCI_MAP_ATTR_WRITE;
 268
 269         local_irq_save(flags);
 270
 271         iommu_batch_start(dev, prot, entry);
 272
 273         for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
 274                 long err = iommu_batch_add(base_paddr);
 275                 if (unlikely(err < 0L))
 276                         goto iommu_map_fail;
 277         }
 278         if (unlikely(iommu_batch_end() < 0L))
 279                 goto iommu_map_fail;
 280
 281         local_irq_restore(flags);
 282
 283         return ret;
 284
 285 bad:
 286         if (printk_ratelimit())
 287                 WARN_ON(1);
 288         return DMA_ERROR_CODE;
 289
 290 iommu_map_fail:
 291         /* Interrupts are disabled.  */
 292         spin_lock(&iommu->lock);
 293         iommu_range_free(iommu, bus_addr, npages);
 294         spin_unlock_irqrestore(&iommu->lock, flags);
 295
 296         return DMA_ERROR_CODE;
 297 }
 298
 299 static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
 300                               size_t sz, enum dma_data_direction direction,
 301                               struct dma_attrs *attrs)
 302 {
 303         struct pci_pbm_info *pbm;
 304         struct iommu *iommu;
 305         unsigned long flags, npages;
 306         long entry;
 307         u32 devhandle;
 308
 309         if (unlikely(direction == DMA_NONE)) {
 310                 if (printk_ratelimit())
 311                         WARN_ON(1);
 312                 return;
 313         }
 314
 315         iommu = dev->archdata.iommu;
 316         pbm = dev->archdata.host_controller;
 317         devhandle = pbm->devhandle;
 318
 319         npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
 320         npages >>= IO_PAGE_SHIFT;
 321         bus_addr &= IO_PAGE_MASK;
 322
 323         spin_lock_irqsave(&iommu->lock, flags);
 324
 325         iommu_range_free(iommu, bus_addr, npages);
 326
 327         entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
 328         do {
 329                 unsigned long num;
 330
 331                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 332                                             npages);
 333                 entry += num;
 334                 npages -= num;
 335         } while (npages != 0);
 336
 337         spin_unlock_irqrestore(&iommu->lock, flags);
 338 }
 339
 340 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 341                          int nelems, enum dma_data_direction direction,
 342                          struct dma_attrs *attrs)
 343 {
 344         struct scatterlist *s, *outs, *segstart;
 345         unsigned long flags, handle, prot;
 346         dma_addr_t dma_next = 0, dma_addr;
 347         unsigned int max_seg_size;
 348         unsigned long seg_boundary_size;
 349         int outcount, incount, i;
 350         struct iommu *iommu;
 351         unsigned long base_shift;
 352         long err;
 353
 354         BUG_ON(direction == DMA_NONE);
 355
 356         iommu = dev->archdata.iommu;
 357         if (nelems == 0 || !iommu)
 358                 return 0;
 359
 360         prot = HV_PCI_MAP_ATTR_READ;
 361         if (direction != DMA_TO_DEVICE)
 362                 prot |= HV_PCI_MAP_ATTR_WRITE;
 363
 364         outs = s = segstart = &sglist[0];
 365         outcount = 1;
 366         incount = nelems;
 367         handle = 0;
 368
 369         /* Init first segment length for backout at failure */
 370         outs->dma_length = 0;
 371
 372         spin_lock_irqsave(&iommu->lock, flags);
 373
 374         iommu_batch_start(dev, prot, ~0UL);
 375
 376         max_seg_size = dma_get_max_seg_size(dev);
 377         seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
 378                                   IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
 379         base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
 380         for_each_sg(sglist, s, nelems, i) {
 381                 unsigned long paddr, npages, entry, out_entry = 0, slen;
 382
 383                 slen = s->length;
 384                 /* Sanity check */
 385                 if (slen == 0) {
 386                         dma_next = 0;
 387                         continue;
 388                 }
 389                 /* Allocate iommu entries for that segment */
 390                 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
 391                 npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE);
 392                 entry = iommu_range_alloc(dev, iommu, npages, &handle);
 393
 394                 /* Handle failure */
 395                 if (unlikely(entry == DMA_ERROR_CODE)) {
 396                         if (printk_ratelimit())
 397                                 printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
 398                                        " npages %lx\n", iommu, paddr, npages);
 399                         goto iommu_map_failed;
 400                 }
 401
 402                 iommu_batch_new_entry(entry);
 403
 404                 /* Convert entry to a dma_addr_t */
 405                 dma_addr = iommu->page_table_map_base +
 406                         (entry << IO_PAGE_SHIFT);
 407                 dma_addr |= (s->offset & ~IO_PAGE_MASK);
 408
 409                 /* Insert into HW table */
 410                 paddr &= IO_PAGE_MASK;
 411                 while (npages--) {
 412                         err = iommu_batch_add(paddr);
 413                         if (unlikely(err < 0L))
 414                                 goto iommu_map_failed;
 415                         paddr += IO_PAGE_SIZE;
 416                 }
 417
 418                 /* If we are in an open segment, try merging */
 419                 if (segstart != s) {
 420                         /* We cannot merge if:
 421                          * - allocated dma_addr isn't contiguous to previous allocation
 422                          */
 423                         if ((dma_addr != dma_next) ||
 424                             (outs->dma_length + s->length > max_seg_size) ||
 425                             (is_span_boundary(out_entry, base_shift,
 426                                               seg_boundary_size, outs, s))) {
 427                                 /* Can't merge: create a new segment */
 428                                 segstart = s;
 429                                 outcount++;
 430                                 outs = sg_next(outs);
 431                         } else {
 432                                 outs->dma_length += s->length;
 433                         }
 434                 }
 435
 436                 if (segstart == s) {
 437                         /* This is a new segment, fill entries */
 438                         outs->dma_address = dma_addr;
 439                         outs->dma_length = slen;
 440                         out_entry = entry;
 441                 }
 442
 443                 /* Calculate next page pointer for contiguous check */
 444                 dma_next = dma_addr + slen;
 445         }
 446
 447         err = iommu_batch_end();
 448
 449         if (unlikely(err < 0L))
 450                 goto iommu_map_failed;
 451
 452         spin_unlock_irqrestore(&iommu->lock, flags);
 453
 454         if (outcount < incount) {
 455                 outs = sg_next(outs);
 456                 outs->dma_address = DMA_ERROR_CODE;
 457                 outs->dma_length = 0;
 458         }
 459
 460         return outcount;
 461
 462 iommu_map_failed:
 463         for_each_sg(sglist, s, nelems, i) {
 464                 if (s->dma_length != 0) {
 465                         unsigned long vaddr, npages;
 466
 467                         vaddr = s->dma_address & IO_PAGE_MASK;
 468                         npages = iommu_num_pages(s->dma_address, s->dma_length,
 469                                                  IO_PAGE_SIZE);
 470                         iommu_range_free(iommu, vaddr, npages);
 471                         /* XXX demap? XXX */
 472                         s->dma_address = DMA_ERROR_CODE;
 473                         s->dma_length = 0;
 474                 }
 475                 if (s == outs)
 476                         break;
 477         }
 478         spin_unlock_irqrestore(&iommu->lock, flags);
 479
 480         return 0;
 481 }
 482
 483 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
 484                             int nelems, enum dma_data_direction direction,
 485                             struct dma_attrs *attrs)
 486 {
 487         struct pci_pbm_info *pbm;
 488         struct scatterlist *sg;
 489         struct iommu *iommu;
 490         unsigned long flags;
 491         u32 devhandle;
 492
 493         BUG_ON(direction == DMA_NONE);
 494
 495         iommu = dev->archdata.iommu;
 496         pbm = dev->archdata.host_controller;
 497         devhandle = pbm->devhandle;
 498
 499         spin_lock_irqsave(&iommu->lock, flags);
 500
 501         sg = sglist;
 502         while (nelems--) {
 503                 dma_addr_t dma_handle = sg->dma_address;
 504                 unsigned int len = sg->dma_length;
 505                 unsigned long npages, entry;
 506
 507                 if (!len)
 508                         break;
 509                 npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE);
 510                 iommu_range_free(iommu, dma_handle, npages);
 511
 512                 entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 513                 while (npages) {
 514                         unsigned long num;
 515
 516                         num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 517                                                     npages);
 518                         entry += num;
 519                         npages -= num;
 520                 }
 521
 522                 sg = sg_next(sg);
 523         }
 524
 525         spin_unlock_irqrestore(&iommu->lock, flags);
 526 }
 527
 528 static struct dma_map_ops sun4v_dma_ops = {
 529         .alloc_coherent                 = dma_4v_alloc_coherent,
 530         .free_coherent                  = dma_4v_free_coherent,
 531         .map_page                       = dma_4v_map_page,
 532         .unmap_page                     = dma_4v_unmap_page,
 533         .map_sg                         = dma_4v_map_sg,
 534         .unmap_sg                       = dma_4v_unmap_sg,
 535 };
 536
 537 static void __devinit pci_sun4v_scan_bus(struct pci_pbm_info *pbm,
 538                                          struct device *parent)
 539 {
 540         struct property *prop;
 541         struct device_node *dp;
 542
 543         dp = pbm->op->dev.of_node;
 544         prop = of_find_property(dp, "66mhz-capable", NULL);
 545         pbm->is_66mhz_capable = (prop != NULL);
 546         pbm->pci_bus = pci_scan_one_pbm(pbm, parent);
 547
 548         /* XXX register error interrupt handlers XXX */
 549 }
 550
 551 static unsigned long __devinit probe_existing_entries(struct pci_pbm_info *pbm,
 552                                                       struct iommu *iommu)
 553 {
 554         struct iommu_arena *arena = &iommu->arena;
 555         unsigned long i, cnt = 0;
 556         u32 devhandle;
 557
 558         devhandle = pbm->devhandle;
 559         for (i = 0; i < arena->limit; i++) {
 560                 unsigned long ret, io_attrs, ra;
 561
 562                 ret = pci_sun4v_iommu_getmap(devhandle,
 563                                              HV_PCI_TSBID(0, i),
 564                                              &io_attrs, &ra);
 565                 if (ret == HV_EOK) {
 566                         if (page_in_phys_avail(ra)) {
 567                                 pci_sun4v_iommu_demap(devhandle,
 568                                                       HV_PCI_TSBID(0, i), 1);
 569                         } else {
 570                                 cnt++;
 571                                 __set_bit(i, arena->map);
 572                         }
 573                 }
 574         }
 575
 576         return cnt;
 577 }
 578
 579 static int __devinit pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 580 {
 581         static const u32 vdma_default[] = { 0x80000000, 0x80000000 };
 582         struct iommu *iommu = pbm->iommu;
 583         unsigned long num_tsb_entries, sz, tsbsize;
 584         u32 dma_mask, dma_offset;
 585         const u32 *vdma;
 586
 587         vdma = of_get_property(pbm->op->dev.of_node, "virtual-dma", NULL);
 588         if (!vdma)
 589                 vdma = vdma_default;
 590
 591         if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
 592                 printk(KERN_ERR PFX "Strange virtual-dma[%08x:%08x].\n",
 593                        vdma[0], vdma[1]);
 594                 return -EINVAL;
 595         };
 596
 597         dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
 598         num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
 599         tsbsize = num_tsb_entries * sizeof(iopte_t);
 600
 601         dma_offset = vdma[0];
 602
 603         /* Setup initial software IOMMU state. */
 604         spin_lock_init(&iommu->lock);
 605         iommu->ctx_lowest_free = 1;
 606         iommu->page_table_map_base = dma_offset;
 607         iommu->dma_addr_mask = dma_mask;
 608
 609         /* Allocate and initialize the free area map.  */
 610         sz = (num_tsb_entries + 7) / 8;
 611         sz = (sz + 7UL) & ~7UL;
 612         iommu->arena.map = kzalloc(sz, GFP_KERNEL);
 613         if (!iommu->arena.map) {
 614                 printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n");
 615                 return -ENOMEM;
 616         }
 617         iommu->arena.limit = num_tsb_entries;
 618
 619         sz = probe_existing_entries(pbm, iommu);
 620         if (sz)
 621                 printk("%s: Imported %lu TSB entries from OBP\n",
 622                        pbm->name, sz);
 623
 624         return 0;
 625 }
 626
 627 #ifdef CONFIG_PCI_MSI
 628 struct pci_sun4v_msiq_entry {
 629         u64             version_type;
 630 #define MSIQ_VERSION_MASK               0xffffffff00000000UL
 631 #define MSIQ_VERSION_SHIFT              32
 632 #define MSIQ_TYPE_MASK                  0x00000000000000ffUL
 633 #define MSIQ_TYPE_SHIFT                 0
 634 #define MSIQ_TYPE_NONE                  0x00
 635 #define MSIQ_TYPE_MSG                   0x01
 636 #define MSIQ_TYPE_MSI32                 0x02
 637 #define MSIQ_TYPE_MSI64                 0x03
 638 #define MSIQ_TYPE_INTX                  0x08
 639 #define MSIQ_TYPE_NONE2                 0xff
 640
 641         u64             intx_sysino;
 642         u64             reserved1;
 643         u64             stick;
 644         u64             req_id;  /* bus/device/func */
 645 #define MSIQ_REQID_BUS_MASK             0xff00UL
 646 #define MSIQ_REQID_BUS_SHIFT            8
 647 #define MSIQ_REQID_DEVICE_MASK          0x00f8UL
 648 #define MSIQ_REQID_DEVICE_SHIFT         3
 649 #define MSIQ_REQID_FUNC_MASK            0x0007UL
 650 #define MSIQ_REQID_FUNC_SHIFT           0
 651
 652         u64             msi_address;
 653
 654         /* The format of this value is message type dependent.
 655          * For MSI bits 15:0 are the data from the MSI packet.
 656          * For MSI-X bits 31:0 are the data from the MSI packet.
 657          * For MSG, the message code and message routing code where:
 658          *      bits 39:32 is the bus/device/fn of the msg target-id
 659          *      bits 18:16 is the message routing code
 660          *      bits 7:0 is the message code
 661          * For INTx the low order 2-bits are:
 662          *      00 - INTA
 663          *      01 - INTB
 664          *      10 - INTC
 665          *      11 - INTD
 666          */
 667         u64             msi_data;
 668
 669         u64             reserved2;
 670 };
 671
 672 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 673                               unsigned long *head)
 674 {
 675         unsigned long err, limit;
 676
 677         err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head);
 678         if (unlikely(err))
 679                 return -ENXIO;
 680
 681         limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 682         if (unlikely(*head >= limit))
 683                 return -EFBIG;
 684
 685         return 0;
 686 }
 687
 688 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm,
 689                                  unsigned long msiqid, unsigned long *head,
 690                                  unsigned long *msi)
 691 {
 692         struct pci_sun4v_msiq_entry *ep;
 693         unsigned long err, type;
 694
 695         /* Note: void pointer arithmetic, 'head' is a byte offset  */
 696         ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) *
 697                                  (pbm->msiq_ent_count *
 698                                   sizeof(struct pci_sun4v_msiq_entry))) +
 699               *head);
 700
 701         if ((ep->version_type & MSIQ_TYPE_MASK) == 0)
 702                 return 0;
 703
 704         type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT;
 705         if (unlikely(type != MSIQ_TYPE_MSI32 &&
 706                      type != MSIQ_TYPE_MSI64))
 707                 return -EINVAL;
 708
 709         *msi = ep->msi_data;
 710
 711         err = pci_sun4v_msi_setstate(pbm->devhandle,
 712                                      ep->msi_data /* msi_num */,
 713                                      HV_MSISTATE_IDLE);
 714         if (unlikely(err))
 715                 return -ENXIO;
 716
 717         /* Clear the entry.  */
 718         ep->version_type &= ~MSIQ_TYPE_MASK;
 719
 720         (*head) += sizeof(struct pci_sun4v_msiq_entry);
 721         if (*head >=
 722             (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry)))
 723                 *head = 0;
 724
 725         return 1;
 726 }
 727
 728 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 729                               unsigned long head)
 730 {
 731         unsigned long err;
 732
 733         err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head);
 734         if (unlikely(err))
 735                 return -EINVAL;
 736
 737         return 0;
 738 }
 739
 740 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
 741                                unsigned long msi, int is_msi64)
 742 {
 743         if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid,
 744                                   (is_msi64 ?
 745                                    HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32)))
 746                 return -ENXIO;
 747         if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE))
 748                 return -ENXIO;
 749         if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID))
 750                 return -ENXIO;
 751         return 0;
 752 }
 753
 754 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
 755 {
 756         unsigned long err, msiqid;
 757
 758         err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid);
 759         if (err)
 760                 return -ENXIO;
 761
 762         pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID);
 763
 764         return 0;
 765 }
 766
 767 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm)
 768 {
 769         unsigned long q_size, alloc_size, pages, order;
 770         int i;
 771
 772         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 773         alloc_size = (pbm->msiq_num * q_size);
 774         order = get_order(alloc_size);
 775         pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
 776         if (pages == 0UL) {
 777                 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
 778                        order);
 779                 return -ENOMEM;
 780         }
 781         memset((char *)pages, 0, PAGE_SIZE << order);
 782         pbm->msi_queues = (void *) pages;
 783
 784         for (i = 0; i < pbm->msiq_num; i++) {
 785                 unsigned long err, base = __pa(pages + (i * q_size));
 786                 unsigned long ret1, ret2;
 787
 788                 err = pci_sun4v_msiq_conf(pbm->devhandle,
 789                                           pbm->msiq_first + i,
 790                                           base, pbm->msiq_ent_count);
 791                 if (err) {
 792                         printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n",
 793                                err);
 794                         goto h_error;
 795                 }
 796
 797                 err = pci_sun4v_msiq_info(pbm->devhandle,
 798                                           pbm->msiq_first + i,
 799                                           &ret1, &ret2);
 800                 if (err) {
 801                         printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n",
 802                                err);
 803                         goto h_error;
 804                 }
 805                 if (ret1 != base || ret2 != pbm->msiq_ent_count) {
 806                         printk(KERN_ERR "MSI: Bogus qconf "
 807                                "expected[%lx:%x] got[%lx:%lx]\n",
 808                                base, pbm->msiq_ent_count,
 809                                ret1, ret2);
 810                         goto h_error;
 811                 }
 812         }
 813
 814         return 0;
 815
 816 h_error:
 817         free_pages(pages, order);
 818         return -EINVAL;
 819 }
 820
 821 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm)
 822 {
 823         unsigned long q_size, alloc_size, pages, order;
 824         int i;
 825
 826         for (i = 0; i < pbm->msiq_num; i++) {
 827                 unsigned long msiqid = pbm->msiq_first + i;
 828
 829                 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0);
 830         }
 831
 832         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 833         alloc_size = (pbm->msiq_num * q_size);
 834         order = get_order(alloc_size);
 835
 836         pages = (unsigned long) pbm->msi_queues;
 837
 838         free_pages(pages, order);
 839
 840         pbm->msi_queues = NULL;
 841 }
 842
 843 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm,
 844                                     unsigned long msiqid,
 845                                     unsigned long devino)
 846 {
 847         unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino);
 848
 849         if (!virt_irq)
 850                 return -ENOMEM;
 851
 852         if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE))
 853                 return -EINVAL;
 854         if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID))
 855                 return -EINVAL;
 856
 857         return virt_irq;
 858 }
 859
 860 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = {
 861         .get_head       =       pci_sun4v_get_head,
 862         .dequeue_msi    =       pci_sun4v_dequeue_msi,
 863         .set_head       =       pci_sun4v_set_head,
 864         .msi_setup      =       pci_sun4v_msi_setup,
 865         .msi_teardown   =       pci_sun4v_msi_teardown,
 866         .msiq_alloc     =       pci_sun4v_msiq_alloc,
 867         .msiq_free      =       pci_sun4v_msiq_free,
 868         .msiq_build_irq =       pci_sun4v_msiq_build_irq,
 869 };
 870
 871 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 872 {
 873         sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops);
 874 }
 875 #else /* CONFIG_PCI_MSI */
 876 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 877 {
 878 }
 879 #endif /* !(CONFIG_PCI_MSI) */
 880
 881 static int __devinit pci_sun4v_pbm_init(struct pci_pbm_info *pbm,
 882                                         struct of_device *op, u32 devhandle)
 883 {
 884         struct device_node *dp = op->dev.of_node;
 885         int err;
 886
 887         pbm->numa_node = of_node_to_nid(dp);
 888
 889         pbm->pci_ops = &sun4v_pci_ops;
 890         pbm->config_space_reg_bits = 12;
 891
 892         pbm->index = pci_num_pbms++;
 893
 894         pbm->op = op;
 895
 896         pbm->devhandle = devhandle;
 897
 898         pbm->name = dp->full_name;
 899
 900         printk("%s: SUN4V PCI Bus Module\n", pbm->name);
 901         printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node);
 902
 903         pci_determine_mem_io_space(pbm);
 904
 905         pci_get_pbm_props(pbm);
 906
 907         err = pci_sun4v_iommu_init(pbm);
 908         if (err)
 909                 return err;
 910
 911         pci_sun4v_msi_init(pbm);
 912
 913         pci_sun4v_scan_bus(pbm, &op->dev);
 914
 915         pbm->next = pci_pbm_root;
 916         pci_pbm_root = pbm;
 917
 918         return 0;
 919 }
 920
 921 static int __devinit pci_sun4v_probe(struct of_device *op,
 922                                      const struct of_device_id *match)
 923 {
 924         const struct linux_prom64_registers *regs;
 925         static int hvapi_negotiated = 0;
 926         struct pci_pbm_info *pbm;
 927         struct device_node *dp;
 928         struct iommu *iommu;
 929         u32 devhandle;
 930         int i, err;
 931
 932         dp = op->dev.of_node;
 933
 934         if (!hvapi_negotiated++) {
 935                 err = sun4v_hvapi_register(HV_GRP_PCI,
 936                                            vpci_major,
 937                                            &vpci_minor);
 938
 939                 if (err) {
 940                         printk(KERN_ERR PFX "Could not register hvapi, "
 941                                "err=%d\n", err);
 942                         return err;
 943                 }
 944                 printk(KERN_INFO PFX "Registered hvapi major[%lu] minor[%lu]\n",
 945                        vpci_major, vpci_minor);
 946
 947                 dma_ops = &sun4v_dma_ops;
 948         }
 949
 950         regs = of_get_property(dp, "reg", NULL);
 951         err = -ENODEV;
 952         if (!regs) {
 953                 printk(KERN_ERR PFX "Could not find config registers\n");
 954                 goto out_err;
 955         }
 956         devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
 957
 958         err = -ENOMEM;
 959         if (!iommu_batch_initialized) {
 960                 for_each_possible_cpu(i) {
 961                         unsigned long page = get_zeroed_page(GFP_KERNEL);
 962
 963                         if (!page)
 964                                 goto out_err;
 965
 966                         per_cpu(iommu_batch, i).pglist = (u64 *) page;
 967                 }
 968                 iommu_batch_initialized = 1;
 969         }
 970
 971         pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
 972         if (!pbm) {
 973                 printk(KERN_ERR PFX "Could not allocate pci_pbm_info\n");
 974                 goto out_err;
 975         }
 976
 977         iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL);
 978         if (!iommu) {
 979                 printk(KERN_ERR PFX "Could not allocate pbm iommu\n");
 980                 goto out_free_controller;
 981         }
 982
 983         pbm->iommu = iommu;
 984
 985         err = pci_sun4v_pbm_init(pbm, op, devhandle);
 986         if (err)
 987                 goto out_free_iommu;
 988
 989         dev_set_drvdata(&op->dev, pbm);
 990
 991         return 0;
 992
 993 out_free_iommu:
 994         kfree(pbm->iommu);
 995
 996 out_free_controller:
 997         kfree(pbm);
 998
 999 out_err:
1000         return err;
1001 }
1002
1003 static struct of_device_id __initdata pci_sun4v_match[] = {
1004         {
1005                 .name = "pci",
1006                 .compatible = "SUNW,sun4v-pci",
1007         },
1008         {},
1009 };
1010
1011 static struct of_platform_driver pci_sun4v_driver = {
1012         .driver = {
1013                 .name = DRIVER_NAME,
1014                 .owner = THIS_MODULE,
1015                 .of_match_table = pci_sun4v_match,
1016         },
1017         .probe          = pci_sun4v_probe,
1018 };
1019
1020 static int __init pci_sun4v_init(void)
1021 {
1022         return of_register_driver(&pci_sun4v_driver, &of_bus_type);
1023 }
1024
1025 subsys_initcall(pci_sun4v_init);