arch/sparc64/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:%08lx:%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_single(struct device *dev, void *ptr, size_t sz,
 234                                     enum dma_data_direction direction)
 235 {
 236         struct iommu *iommu;
 237         unsigned long flags, npages, oaddr;
 238         unsigned long i, base_paddr;
 239         u32 bus_addr, ret;
 240         unsigned long prot;
 241         long entry;
 242
 243         iommu = dev->archdata.iommu;
 244
 245         if (unlikely(direction == DMA_NONE))
 246                 goto bad;
 247
 248         oaddr = (unsigned long)ptr;
 249         npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
 250         npages >>= IO_PAGE_SHIFT;
 251
 252         spin_lock_irqsave(&iommu->lock, flags);
 253         entry = iommu_range_alloc(dev, iommu, npages, NULL);
 254         spin_unlock_irqrestore(&iommu->lock, flags);
 255
 256         if (unlikely(entry == DMA_ERROR_CODE))
 257                 goto bad;
 258
 259         bus_addr = (iommu->page_table_map_base +
 260                     (entry << IO_PAGE_SHIFT));
 261         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
 262         base_paddr = __pa(oaddr & IO_PAGE_MASK);
 263         prot = HV_PCI_MAP_ATTR_READ;
 264         if (direction != DMA_TO_DEVICE)
 265                 prot |= HV_PCI_MAP_ATTR_WRITE;
 266
 267         local_irq_save(flags);
 268
 269         iommu_batch_start(dev, prot, entry);
 270
 271         for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
 272                 long err = iommu_batch_add(base_paddr);
 273                 if (unlikely(err < 0L))
 274                         goto iommu_map_fail;
 275         }
 276         if (unlikely(iommu_batch_end() < 0L))
 277                 goto iommu_map_fail;
 278
 279         local_irq_restore(flags);
 280
 281         return ret;
 282
 283 bad:
 284         if (printk_ratelimit())
 285                 WARN_ON(1);
 286         return DMA_ERROR_CODE;
 287
 288 iommu_map_fail:
 289         /* Interrupts are disabled.  */
 290         spin_lock(&iommu->lock);
 291         iommu_range_free(iommu, bus_addr, npages);
 292         spin_unlock_irqrestore(&iommu->lock, flags);
 293
 294         return DMA_ERROR_CODE;
 295 }
 296
 297 static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
 298                                 size_t sz, enum dma_data_direction direction)
 299 {
 300         struct pci_pbm_info *pbm;
 301         struct iommu *iommu;
 302         unsigned long flags, npages;
 303         long entry;
 304         u32 devhandle;
 305
 306         if (unlikely(direction == DMA_NONE)) {
 307                 if (printk_ratelimit())
 308                         WARN_ON(1);
 309                 return;
 310         }
 311
 312         iommu = dev->archdata.iommu;
 313         pbm = dev->archdata.host_controller;
 314         devhandle = pbm->devhandle;
 315
 316         npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
 317         npages >>= IO_PAGE_SHIFT;
 318         bus_addr &= IO_PAGE_MASK;
 319
 320         spin_lock_irqsave(&iommu->lock, flags);
 321
 322         iommu_range_free(iommu, bus_addr, npages);
 323
 324         entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
 325         do {
 326                 unsigned long num;
 327
 328                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 329                                             npages);
 330                 entry += num;
 331                 npages -= num;
 332         } while (npages != 0);
 333
 334         spin_unlock_irqrestore(&iommu->lock, flags);
 335 }
 336
 337 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 338                          int nelems, enum dma_data_direction direction)
 339 {
 340         struct scatterlist *s, *outs, *segstart;
 341         unsigned long flags, handle, prot;
 342         dma_addr_t dma_next = 0, dma_addr;
 343         unsigned int max_seg_size;
 344         unsigned long seg_boundary_size;
 345         int outcount, incount, i;
 346         struct iommu *iommu;
 347         unsigned long base_shift;
 348         long err;
 349
 350         BUG_ON(direction == DMA_NONE);
 351
 352         iommu = dev->archdata.iommu;
 353         if (nelems == 0 || !iommu)
 354                 return 0;
 355
 356         prot = HV_PCI_MAP_ATTR_READ;
 357         if (direction != DMA_TO_DEVICE)
 358                 prot |= HV_PCI_MAP_ATTR_WRITE;
 359
 360         outs = s = segstart = &sglist[0];
 361         outcount = 1;
 362         incount = nelems;
 363         handle = 0;
 364
 365         /* Init first segment length for backout at failure */
 366         outs->dma_length = 0;
 367
 368         spin_lock_irqsave(&iommu->lock, flags);
 369
 370         iommu_batch_start(dev, prot, ~0UL);
 371
 372         max_seg_size = dma_get_max_seg_size(dev);
 373         seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
 374                                   IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
 375         base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
 376         for_each_sg(sglist, s, nelems, i) {
 377                 unsigned long paddr, npages, entry, out_entry = 0, slen;
 378
 379                 slen = s->length;
 380                 /* Sanity check */
 381                 if (slen == 0) {
 382                         dma_next = 0;
 383                         continue;
 384                 }
 385                 /* Allocate iommu entries for that segment */
 386                 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
 387                 npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE);
 388                 entry = iommu_range_alloc(dev, iommu, npages, &handle);
 389
 390                 /* Handle failure */
 391                 if (unlikely(entry == DMA_ERROR_CODE)) {
 392                         if (printk_ratelimit())
 393                                 printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
 394                                        " npages %lx\n", iommu, paddr, npages);
 395                         goto iommu_map_failed;
 396                 }
 397
 398                 iommu_batch_new_entry(entry);
 399
 400                 /* Convert entry to a dma_addr_t */
 401                 dma_addr = iommu->page_table_map_base +
 402                         (entry << IO_PAGE_SHIFT);
 403                 dma_addr |= (s->offset & ~IO_PAGE_MASK);
 404
 405                 /* Insert into HW table */
 406                 paddr &= IO_PAGE_MASK;
 407                 while (npages--) {
 408                         err = iommu_batch_add(paddr);
 409                         if (unlikely(err < 0L))
 410                                 goto iommu_map_failed;
 411                         paddr += IO_PAGE_SIZE;
 412                 }
 413
 414                 /* If we are in an open segment, try merging */
 415                 if (segstart != s) {
 416                         /* We cannot merge if:
 417                          * - allocated dma_addr isn't contiguous to previous allocation
 418                          */
 419                         if ((dma_addr != dma_next) ||
 420                             (outs->dma_length + s->length > max_seg_size) ||
 421                             (is_span_boundary(out_entry, base_shift,
 422                                               seg_boundary_size, outs, s))) {
 423                                 /* Can't merge: create a new segment */
 424                                 segstart = s;
 425                                 outcount++;
 426                                 outs = sg_next(outs);
 427                         } else {
 428                                 outs->dma_length += s->length;
 429                         }
 430                 }
 431
 432                 if (segstart == s) {
 433                         /* This is a new segment, fill entries */
 434                         outs->dma_address = dma_addr;
 435                         outs->dma_length = slen;
 436                         out_entry = entry;
 437                 }
 438
 439                 /* Calculate next page pointer for contiguous check */
 440                 dma_next = dma_addr + slen;
 441         }
 442
 443         err = iommu_batch_end();
 444
 445         if (unlikely(err < 0L))
 446                 goto iommu_map_failed;
 447
 448         spin_unlock_irqrestore(&iommu->lock, flags);
 449
 450         if (outcount < incount) {
 451                 outs = sg_next(outs);
 452                 outs->dma_address = DMA_ERROR_CODE;
 453                 outs->dma_length = 0;
 454         }
 455
 456         return outcount;
 457
 458 iommu_map_failed:
 459         for_each_sg(sglist, s, nelems, i) {
 460                 if (s->dma_length != 0) {
 461                         unsigned long vaddr, npages;
 462
 463                         vaddr = s->dma_address & IO_PAGE_MASK;
 464                         npages = iommu_num_pages(s->dma_address, s->dma_length,
 465                                                  IO_PAGE_SIZE);
 466                         iommu_range_free(iommu, vaddr, npages);
 467                         /* XXX demap? XXX */
 468                         s->dma_address = DMA_ERROR_CODE;
 469                         s->dma_length = 0;
 470                 }
 471                 if (s == outs)
 472                         break;
 473         }
 474         spin_unlock_irqrestore(&iommu->lock, flags);
 475
 476         return 0;
 477 }
 478
 479 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
 480                             int nelems, enum dma_data_direction direction)
 481 {
 482         struct pci_pbm_info *pbm;
 483         struct scatterlist *sg;
 484         struct iommu *iommu;
 485         unsigned long flags;
 486         u32 devhandle;
 487
 488         BUG_ON(direction == DMA_NONE);
 489
 490         iommu = dev->archdata.iommu;
 491         pbm = dev->archdata.host_controller;
 492         devhandle = pbm->devhandle;
 493
 494         spin_lock_irqsave(&iommu->lock, flags);
 495
 496         sg = sglist;
 497         while (nelems--) {
 498                 dma_addr_t dma_handle = sg->dma_address;
 499                 unsigned int len = sg->dma_length;
 500                 unsigned long npages, entry;
 501
 502                 if (!len)
 503                         break;
 504                 npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE);
 505                 iommu_range_free(iommu, dma_handle, npages);
 506
 507                 entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 508                 while (npages) {
 509                         unsigned long num;
 510
 511                         num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 512                                                     npages);
 513                         entry += num;
 514                         npages -= num;
 515                 }
 516
 517                 sg = sg_next(sg);
 518         }
 519
 520         spin_unlock_irqrestore(&iommu->lock, flags);
 521 }
 522
 523 static void dma_4v_sync_single_for_cpu(struct device *dev,
 524                                        dma_addr_t bus_addr, size_t sz,
 525                                        enum dma_data_direction direction)
 526 {
 527         /* Nothing to do... */
 528 }
 529
 530 static void dma_4v_sync_sg_for_cpu(struct device *dev,
 531                                    struct scatterlist *sglist, int nelems,
 532                                    enum dma_data_direction direction)
 533 {
 534         /* Nothing to do... */
 535 }
 536
 537 static const struct dma_ops sun4v_dma_ops = {
 538         .alloc_coherent                 = dma_4v_alloc_coherent,
 539         .free_coherent                  = dma_4v_free_coherent,
 540         .map_single                     = dma_4v_map_single,
 541         .unmap_single                   = dma_4v_unmap_single,
 542         .map_sg                         = dma_4v_map_sg,
 543         .unmap_sg                       = dma_4v_unmap_sg,
 544         .sync_single_for_cpu            = dma_4v_sync_single_for_cpu,
 545         .sync_sg_for_cpu                = dma_4v_sync_sg_for_cpu,
 546 };
 547
 548 static void __init pci_sun4v_scan_bus(struct pci_pbm_info *pbm,
 549                                       struct device *parent)
 550 {
 551         struct property *prop;
 552         struct device_node *dp;
 553
 554         dp = pbm->op->node;
 555         prop = of_find_property(dp, "66mhz-capable", NULL);
 556         pbm->is_66mhz_capable = (prop != NULL);
 557         pbm->pci_bus = pci_scan_one_pbm(pbm, parent);
 558
 559         /* XXX register error interrupt handlers XXX */
 560 }
 561
 562 static unsigned long __init probe_existing_entries(struct pci_pbm_info *pbm,
 563                                                    struct iommu *iommu)
 564 {
 565         struct iommu_arena *arena = &iommu->arena;
 566         unsigned long i, cnt = 0;
 567         u32 devhandle;
 568
 569         devhandle = pbm->devhandle;
 570         for (i = 0; i < arena->limit; i++) {
 571                 unsigned long ret, io_attrs, ra;
 572
 573                 ret = pci_sun4v_iommu_getmap(devhandle,
 574                                              HV_PCI_TSBID(0, i),
 575                                              &io_attrs, &ra);
 576                 if (ret == HV_EOK) {
 577                         if (page_in_phys_avail(ra)) {
 578                                 pci_sun4v_iommu_demap(devhandle,
 579                                                       HV_PCI_TSBID(0, i), 1);
 580                         } else {
 581                                 cnt++;
 582                                 __set_bit(i, arena->map);
 583                         }
 584                 }
 585         }
 586
 587         return cnt;
 588 }
 589
 590 static int __init pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 591 {
 592         static const u32 vdma_default[] = { 0x80000000, 0x80000000 };
 593         struct iommu *iommu = pbm->iommu;
 594         unsigned long num_tsb_entries, sz, tsbsize;
 595         u32 dma_mask, dma_offset;
 596         const u32 *vdma;
 597
 598         vdma = of_get_property(pbm->op->node, "virtual-dma", NULL);
 599         if (!vdma)
 600                 vdma = vdma_default;
 601
 602         if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
 603                 printk(KERN_ERR PFX "Strange virtual-dma[%08x:%08x].\n",
 604                        vdma[0], vdma[1]);
 605                 return -EINVAL;
 606         };
 607
 608         dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
 609         num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
 610         tsbsize = num_tsb_entries * sizeof(iopte_t);
 611
 612         dma_offset = vdma[0];
 613
 614         /* Setup initial software IOMMU state. */
 615         spin_lock_init(&iommu->lock);
 616         iommu->ctx_lowest_free = 1;
 617         iommu->page_table_map_base = dma_offset;
 618         iommu->dma_addr_mask = dma_mask;
 619
 620         /* Allocate and initialize the free area map.  */
 621         sz = (num_tsb_entries + 7) / 8;
 622         sz = (sz + 7UL) & ~7UL;
 623         iommu->arena.map = kzalloc(sz, GFP_KERNEL);
 624         if (!iommu->arena.map) {
 625                 printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n");
 626                 return -ENOMEM;
 627         }
 628         iommu->arena.limit = num_tsb_entries;
 629
 630         sz = probe_existing_entries(pbm, iommu);
 631         if (sz)
 632                 printk("%s: Imported %lu TSB entries from OBP\n",
 633                        pbm->name, sz);
 634
 635         return 0;
 636 }
 637
 638 #ifdef CONFIG_PCI_MSI
 639 struct pci_sun4v_msiq_entry {
 640         u64             version_type;
 641 #define MSIQ_VERSION_MASK               0xffffffff00000000UL
 642 #define MSIQ_VERSION_SHIFT              32
 643 #define MSIQ_TYPE_MASK                  0x00000000000000ffUL
 644 #define MSIQ_TYPE_SHIFT                 0
 645 #define MSIQ_TYPE_NONE                  0x00
 646 #define MSIQ_TYPE_MSG                   0x01
 647 #define MSIQ_TYPE_MSI32                 0x02
 648 #define MSIQ_TYPE_MSI64                 0x03
 649 #define MSIQ_TYPE_INTX                  0x08
 650 #define MSIQ_TYPE_NONE2                 0xff
 651
 652         u64             intx_sysino;
 653         u64             reserved1;
 654         u64             stick;
 655         u64             req_id;  /* bus/device/func */
 656 #define MSIQ_REQID_BUS_MASK             0xff00UL
 657 #define MSIQ_REQID_BUS_SHIFT            8
 658 #define MSIQ_REQID_DEVICE_MASK          0x00f8UL
 659 #define MSIQ_REQID_DEVICE_SHIFT         3
 660 #define MSIQ_REQID_FUNC_MASK            0x0007UL
 661 #define MSIQ_REQID_FUNC_SHIFT           0
 662
 663         u64             msi_address;
 664
 665         /* The format of this value is message type dependent.
 666          * For MSI bits 15:0 are the data from the MSI packet.
 667          * For MSI-X bits 31:0 are the data from the MSI packet.
 668          * For MSG, the message code and message routing code where:
 669          *      bits 39:32 is the bus/device/fn of the msg target-id
 670          *      bits 18:16 is the message routing code
 671          *      bits 7:0 is the message code
 672          * For INTx the low order 2-bits are:
 673          *      00 - INTA
 674          *      01 - INTB
 675          *      10 - INTC
 676          *      11 - INTD
 677          */
 678         u64             msi_data;
 679
 680         u64             reserved2;
 681 };
 682
 683 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 684                               unsigned long *head)
 685 {
 686         unsigned long err, limit;
 687
 688         err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head);
 689         if (unlikely(err))
 690                 return -ENXIO;
 691
 692         limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 693         if (unlikely(*head >= limit))
 694                 return -EFBIG;
 695
 696         return 0;
 697 }
 698
 699 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm,
 700                                  unsigned long msiqid, unsigned long *head,
 701                                  unsigned long *msi)
 702 {
 703         struct pci_sun4v_msiq_entry *ep;
 704         unsigned long err, type;
 705
 706         /* Note: void pointer arithmetic, 'head' is a byte offset  */
 707         ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) *
 708                                  (pbm->msiq_ent_count *
 709                                   sizeof(struct pci_sun4v_msiq_entry))) +
 710               *head);
 711
 712         if ((ep->version_type & MSIQ_TYPE_MASK) == 0)
 713                 return 0;
 714
 715         type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT;
 716         if (unlikely(type != MSIQ_TYPE_MSI32 &&
 717                      type != MSIQ_TYPE_MSI64))
 718                 return -EINVAL;
 719
 720         *msi = ep->msi_data;
 721
 722         err = pci_sun4v_msi_setstate(pbm->devhandle,
 723                                      ep->msi_data /* msi_num */,
 724                                      HV_MSISTATE_IDLE);
 725         if (unlikely(err))
 726                 return -ENXIO;
 727
 728         /* Clear the entry.  */
 729         ep->version_type &= ~MSIQ_TYPE_MASK;
 730
 731         (*head) += sizeof(struct pci_sun4v_msiq_entry);
 732         if (*head >=
 733             (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry)))
 734                 *head = 0;
 735
 736         return 1;
 737 }
 738
 739 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 740                               unsigned long head)
 741 {
 742         unsigned long err;
 743
 744         err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head);
 745         if (unlikely(err))
 746                 return -EINVAL;
 747
 748         return 0;
 749 }
 750
 751 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
 752                                unsigned long msi, int is_msi64)
 753 {
 754         if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid,
 755                                   (is_msi64 ?
 756                                    HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32)))
 757                 return -ENXIO;
 758         if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE))
 759                 return -ENXIO;
 760         if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID))
 761                 return -ENXIO;
 762         return 0;
 763 }
 764
 765 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
 766 {
 767         unsigned long err, msiqid;
 768
 769         err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid);
 770         if (err)
 771                 return -ENXIO;
 772
 773         pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID);
 774
 775         return 0;
 776 }
 777
 778 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm)
 779 {
 780         unsigned long q_size, alloc_size, pages, order;
 781         int i;
 782
 783         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 784         alloc_size = (pbm->msiq_num * q_size);
 785         order = get_order(alloc_size);
 786         pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
 787         if (pages == 0UL) {
 788                 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
 789                        order);
 790                 return -ENOMEM;
 791         }
 792         memset((char *)pages, 0, PAGE_SIZE << order);
 793         pbm->msi_queues = (void *) pages;
 794
 795         for (i = 0; i < pbm->msiq_num; i++) {
 796                 unsigned long err, base = __pa(pages + (i * q_size));
 797                 unsigned long ret1, ret2;
 798
 799                 err = pci_sun4v_msiq_conf(pbm->devhandle,
 800                                           pbm->msiq_first + i,
 801                                           base, pbm->msiq_ent_count);
 802                 if (err) {
 803                         printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n",
 804                                err);
 805                         goto h_error;
 806                 }
 807
 808                 err = pci_sun4v_msiq_info(pbm->devhandle,
 809                                           pbm->msiq_first + i,
 810                                           &ret1, &ret2);
 811                 if (err) {
 812                         printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n",
 813                                err);
 814                         goto h_error;
 815                 }
 816                 if (ret1 != base || ret2 != pbm->msiq_ent_count) {
 817                         printk(KERN_ERR "MSI: Bogus qconf "
 818                                "expected[%lx:%x] got[%lx:%lx]\n",
 819                                base, pbm->msiq_ent_count,
 820                                ret1, ret2);
 821                         goto h_error;
 822                 }
 823         }
 824
 825         return 0;
 826
 827 h_error:
 828         free_pages(pages, order);
 829         return -EINVAL;
 830 }
 831
 832 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm)
 833 {
 834         unsigned long q_size, alloc_size, pages, order;
 835         int i;
 836
 837         for (i = 0; i < pbm->msiq_num; i++) {
 838                 unsigned long msiqid = pbm->msiq_first + i;
 839
 840                 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0);
 841         }
 842
 843         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 844         alloc_size = (pbm->msiq_num * q_size);
 845         order = get_order(alloc_size);
 846
 847         pages = (unsigned long) pbm->msi_queues;
 848
 849         free_pages(pages, order);
 850
 851         pbm->msi_queues = NULL;
 852 }
 853
 854 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm,
 855                                     unsigned long msiqid,
 856                                     unsigned long devino)
 857 {
 858         unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino);
 859
 860         if (!virt_irq)
 861                 return -ENOMEM;
 862
 863         if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE))
 864                 return -EINVAL;
 865         if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID))
 866                 return -EINVAL;
 867
 868         return virt_irq;
 869 }
 870
 871 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = {
 872         .get_head       =       pci_sun4v_get_head,
 873         .dequeue_msi    =       pci_sun4v_dequeue_msi,
 874         .set_head       =       pci_sun4v_set_head,
 875         .msi_setup      =       pci_sun4v_msi_setup,
 876         .msi_teardown   =       pci_sun4v_msi_teardown,
 877         .msiq_alloc     =       pci_sun4v_msiq_alloc,
 878         .msiq_free      =       pci_sun4v_msiq_free,
 879         .msiq_build_irq =       pci_sun4v_msiq_build_irq,
 880 };
 881
 882 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 883 {
 884         sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops);
 885 }
 886 #else /* CONFIG_PCI_MSI */
 887 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 888 {
 889 }
 890 #endif /* !(CONFIG_PCI_MSI) */
 891
 892 static int __init pci_sun4v_pbm_init(struct pci_pbm_info *pbm,
 893                                      struct of_device *op, u32 devhandle)
 894 {
 895         struct device_node *dp = op->node;
 896         int err;
 897
 898         pbm->numa_node = of_node_to_nid(dp);
 899
 900         pbm->pci_ops = &sun4v_pci_ops;
 901         pbm->config_space_reg_bits = 12;
 902
 903         pbm->index = pci_num_pbms++;
 904
 905         pbm->op = op;
 906
 907         pbm->devhandle = devhandle;
 908
 909         pbm->name = dp->full_name;
 910
 911         printk("%s: SUN4V PCI Bus Module\n", pbm->name);
 912         printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node);
 913
 914         pci_determine_mem_io_space(pbm);
 915
 916         pci_get_pbm_props(pbm);
 917
 918         err = pci_sun4v_iommu_init(pbm);
 919         if (err)
 920                 return err;
 921
 922         pci_sun4v_msi_init(pbm);
 923
 924         pci_sun4v_scan_bus(pbm, &op->dev);
 925
 926         pbm->next = pci_pbm_root;
 927         pci_pbm_root = pbm;
 928
 929         return 0;
 930 }
 931
 932 static int __devinit pci_sun4v_probe(struct of_device *op,
 933                                      const struct of_device_id *match)
 934 {
 935         const struct linux_prom64_registers *regs;
 936         static int hvapi_negotiated = 0;
 937         struct pci_pbm_info *pbm;
 938         struct device_node *dp;
 939         struct iommu *iommu;
 940         u32 devhandle;
 941         int i, err;
 942
 943         dp = op->node;
 944
 945         if (!hvapi_negotiated++) {
 946                 err = sun4v_hvapi_register(HV_GRP_PCI,
 947                                            vpci_major,
 948                                            &vpci_minor);
 949
 950                 if (err) {
 951                         printk(KERN_ERR PFX "Could not register hvapi, "
 952                                "err=%d\n", err);
 953                         return err;
 954                 }
 955                 printk(KERN_INFO PFX "Registered hvapi major[%lu] minor[%lu]\n",
 956                        vpci_major, vpci_minor);
 957
 958                 dma_ops = &sun4v_dma_ops;
 959         }
 960
 961         regs = of_get_property(dp, "reg", NULL);
 962         err = -ENODEV;
 963         if (!regs) {
 964                 printk(KERN_ERR PFX "Could not find config registers\n");
 965                 goto out_err;
 966         }
 967         devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
 968
 969         err = -ENOMEM;
 970         if (!iommu_batch_initialized) {
 971                 for_each_possible_cpu(i) {
 972                         unsigned long page = get_zeroed_page(GFP_KERNEL);
 973
 974                         if (!page)
 975                                 goto out_err;
 976
 977                         per_cpu(iommu_batch, i).pglist = (u64 *) page;
 978                 }
 979                 iommu_batch_initialized = 1;
 980         }
 981
 982         pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
 983         if (!pbm) {
 984                 printk(KERN_ERR PFX "Could not allocate pci_pbm_info\n");
 985                 goto out_err;
 986         }
 987
 988         iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL);
 989         if (!iommu) {
 990                 printk(KERN_ERR PFX "Could not allocate pbm iommu\n");
 991                 goto out_free_controller;
 992         }
 993
 994         pbm->iommu = iommu;
 995
 996         err = pci_sun4v_pbm_init(pbm, op, devhandle);
 997         if (err)
 998                 goto out_free_iommu;
 999
1000         dev_set_drvdata(&op->dev, pbm);
1001
1002         return 0;
1003
1004 out_free_iommu:
1005         kfree(pbm->iommu);
1006
1007 out_free_controller:
1008         kfree(pbm);
1009
1010 out_err:
1011         return err;
1012 }
1013
1014 static struct of_device_id __initdata pci_sun4v_match[] = {
1015         {
1016                 .name = "pci",
1017                 .compatible = "SUNW,sun4v-pci",
1018         },
1019         {},
1020 };
1021
1022 static struct of_platform_driver pci_sun4v_driver = {
1023         .name           = DRIVER_NAME,
1024         .match_table    = pci_sun4v_match,
1025         .probe          = pci_sun4v_probe,
1026 };
1027
1028 static int __init pci_sun4v_init(void)
1029 {
1030         return of_register_driver(&pci_sun4v_driver, &of_bus_type);
1031 }
1032
1033 subsys_initcall(pci_sun4v_init);