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
  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 static inline void iommu_batch_new_entry(unsigned long entry)
  93 {
  94         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
  95
  96         if (p->entry + p->npages == entry)
  97                 return;
  98         if (p->entry != ~0UL)
  99                 iommu_batch_flush(p);
 100         p->entry = entry;
 101 }
 102
 103 /* Interrupts must be disabled.  */
 104 static inline long iommu_batch_add(u64 phys_page)
 105 {
 106         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
 107
 108         BUG_ON(p->npages >= PGLIST_NENTS);
 109
 110         p->pglist[p->npages++] = phys_page;
 111         if (p->npages == PGLIST_NENTS)
 112                 return iommu_batch_flush(p);
 113
 114         return 0;
 115 }
 116
 117 /* Interrupts must be disabled.  */
 118 static inline long iommu_batch_end(void)
 119 {
 120         struct iommu_batch *p = &__get_cpu_var(iommu_batch);
 121
 122         BUG_ON(p->npages >= PGLIST_NENTS);
 123
 124         return iommu_batch_flush(p);
 125 }
 126
 127 static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
 128                                    dma_addr_t *dma_addrp, gfp_t gfp)
 129 {
 130         unsigned long flags, order, first_page, npages, n;
 131         struct iommu *iommu;
 132         struct page *page;
 133         void *ret;
 134         long entry;
 135         int nid;
 136
 137         size = IO_PAGE_ALIGN(size);
 138         order = get_order(size);
 139         if (unlikely(order >= MAX_ORDER))
 140                 return NULL;
 141
 142         npages = size >> IO_PAGE_SHIFT;
 143
 144         nid = dev->archdata.numa_node;
 145         page = alloc_pages_node(nid, gfp, order);
 146         if (unlikely(!page))
 147                 return NULL;
 148
 149         first_page = (unsigned long) page_address(page);
 150         memset((char *)first_page, 0, PAGE_SIZE << order);
 151
 152         iommu = dev->archdata.iommu;
 153
 154         spin_lock_irqsave(&iommu->lock, flags);
 155         entry = iommu_range_alloc(dev, iommu, npages, NULL);
 156         spin_unlock_irqrestore(&iommu->lock, flags);
 157
 158         if (unlikely(entry == DMA_ERROR_CODE))
 159                 goto range_alloc_fail;
 160
 161         *dma_addrp = (iommu->page_table_map_base +
 162                       (entry << IO_PAGE_SHIFT));
 163         ret = (void *) first_page;
 164         first_page = __pa(first_page);
 165
 166         local_irq_save(flags);
 167
 168         iommu_batch_start(dev,
 169                           (HV_PCI_MAP_ATTR_READ |
 170                            HV_PCI_MAP_ATTR_WRITE),
 171                           entry);
 172
 173         for (n = 0; n < npages; n++) {
 174                 long err = iommu_batch_add(first_page + (n * PAGE_SIZE));
 175                 if (unlikely(err < 0L))
 176                         goto iommu_map_fail;
 177         }
 178
 179         if (unlikely(iommu_batch_end() < 0L))
 180                 goto iommu_map_fail;
 181
 182         local_irq_restore(flags);
 183
 184         return ret;
 185
 186 iommu_map_fail:
 187         /* Interrupts are disabled.  */
 188         spin_lock(&iommu->lock);
 189         iommu_range_free(iommu, *dma_addrp, npages);
 190         spin_unlock_irqrestore(&iommu->lock, flags);
 191
 192 range_alloc_fail:
 193         free_pages(first_page, order);
 194         return NULL;
 195 }
 196
 197 static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
 198                                  dma_addr_t dvma)
 199 {
 200         struct pci_pbm_info *pbm;
 201         struct iommu *iommu;
 202         unsigned long flags, order, npages, entry;
 203         u32 devhandle;
 204
 205         npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
 206         iommu = dev->archdata.iommu;
 207         pbm = dev->archdata.host_controller;
 208         devhandle = pbm->devhandle;
 209         entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 210
 211         spin_lock_irqsave(&iommu->lock, flags);
 212
 213         iommu_range_free(iommu, dvma, npages);
 214
 215         do {
 216                 unsigned long num;
 217
 218                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 219                                             npages);
 220                 entry += num;
 221                 npages -= num;
 222         } while (npages != 0);
 223
 224         spin_unlock_irqrestore(&iommu->lock, flags);
 225
 226         order = get_order(size);
 227         if (order < 10)
 228                 free_pages((unsigned long)cpu, order);
 229 }
 230
 231 static dma_addr_t dma_4v_map_single(struct device *dev, void *ptr, size_t sz,
 232                                     enum dma_data_direction direction)
 233 {
 234         struct iommu *iommu;
 235         unsigned long flags, npages, oaddr;
 236         unsigned long i, base_paddr;
 237         u32 bus_addr, ret;
 238         unsigned long prot;
 239         long entry;
 240
 241         iommu = dev->archdata.iommu;
 242
 243         if (unlikely(direction == DMA_NONE))
 244                 goto bad;
 245
 246         oaddr = (unsigned long)ptr;
 247         npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
 248         npages >>= IO_PAGE_SHIFT;
 249
 250         spin_lock_irqsave(&iommu->lock, flags);
 251         entry = iommu_range_alloc(dev, iommu, npages, NULL);
 252         spin_unlock_irqrestore(&iommu->lock, flags);
 253
 254         if (unlikely(entry == DMA_ERROR_CODE))
 255                 goto bad;
 256
 257         bus_addr = (iommu->page_table_map_base +
 258                     (entry << IO_PAGE_SHIFT));
 259         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
 260         base_paddr = __pa(oaddr & IO_PAGE_MASK);
 261         prot = HV_PCI_MAP_ATTR_READ;
 262         if (direction != DMA_TO_DEVICE)
 263                 prot |= HV_PCI_MAP_ATTR_WRITE;
 264
 265         local_irq_save(flags);
 266
 267         iommu_batch_start(dev, prot, entry);
 268
 269         for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
 270                 long err = iommu_batch_add(base_paddr);
 271                 if (unlikely(err < 0L))
 272                         goto iommu_map_fail;
 273         }
 274         if (unlikely(iommu_batch_end() < 0L))
 275                 goto iommu_map_fail;
 276
 277         local_irq_restore(flags);
 278
 279         return ret;
 280
 281 bad:
 282         if (printk_ratelimit())
 283                 WARN_ON(1);
 284         return DMA_ERROR_CODE;
 285
 286 iommu_map_fail:
 287         /* Interrupts are disabled.  */
 288         spin_lock(&iommu->lock);
 289         iommu_range_free(iommu, bus_addr, npages);
 290         spin_unlock_irqrestore(&iommu->lock, flags);
 291
 292         return DMA_ERROR_CODE;
 293 }
 294
 295 static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
 296                                 size_t sz, enum dma_data_direction direction)
 297 {
 298         struct pci_pbm_info *pbm;
 299         struct iommu *iommu;
 300         unsigned long flags, npages;
 301         long entry;
 302         u32 devhandle;
 303
 304         if (unlikely(direction == DMA_NONE)) {
 305                 if (printk_ratelimit())
 306                         WARN_ON(1);
 307                 return;
 308         }
 309
 310         iommu = dev->archdata.iommu;
 311         pbm = dev->archdata.host_controller;
 312         devhandle = pbm->devhandle;
 313
 314         npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
 315         npages >>= IO_PAGE_SHIFT;
 316         bus_addr &= IO_PAGE_MASK;
 317
 318         spin_lock_irqsave(&iommu->lock, flags);
 319
 320         iommu_range_free(iommu, bus_addr, npages);
 321
 322         entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
 323         do {
 324                 unsigned long num;
 325
 326                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 327                                             npages);
 328                 entry += num;
 329                 npages -= num;
 330         } while (npages != 0);
 331
 332         spin_unlock_irqrestore(&iommu->lock, flags);
 333 }
 334
 335 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 336                          int nelems, enum dma_data_direction direction)
 337 {
 338         struct scatterlist *s, *outs, *segstart;
 339         unsigned long flags, handle, prot;
 340         dma_addr_t dma_next = 0, dma_addr;
 341         unsigned int max_seg_size;
 342         unsigned long seg_boundary_size;
 343         int outcount, incount, i;
 344         struct iommu *iommu;
 345         unsigned long base_shift;
 346         long err;
 347
 348         BUG_ON(direction == DMA_NONE);
 349
 350         iommu = dev->archdata.iommu;
 351         if (nelems == 0 || !iommu)
 352                 return 0;
 353
 354         prot = HV_PCI_MAP_ATTR_READ;
 355         if (direction != DMA_TO_DEVICE)
 356                 prot |= HV_PCI_MAP_ATTR_WRITE;
 357
 358         outs = s = segstart = &sglist[0];
 359         outcount = 1;
 360         incount = nelems;
 361         handle = 0;
 362
 363         /* Init first segment length for backout at failure */
 364         outs->dma_length = 0;
 365
 366         spin_lock_irqsave(&iommu->lock, flags);
 367
 368         iommu_batch_start(dev, prot, ~0UL);
 369
 370         max_seg_size = dma_get_max_seg_size(dev);
 371         seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
 372                                   IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
 373         base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
 374         for_each_sg(sglist, s, nelems, i) {
 375                 unsigned long paddr, npages, entry, out_entry = 0, slen;
 376
 377                 slen = s->length;
 378                 /* Sanity check */
 379                 if (slen == 0) {
 380                         dma_next = 0;
 381                         continue;
 382                 }
 383                 /* Allocate iommu entries for that segment */
 384                 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
 385                 npages = iommu_num_pages(paddr, slen);
 386                 entry = iommu_range_alloc(dev, iommu, npages, &handle);
 387
 388                 /* Handle failure */
 389                 if (unlikely(entry == DMA_ERROR_CODE)) {
 390                         if (printk_ratelimit())
 391                                 printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
 392                                        " npages %lx\n", iommu, paddr, npages);
 393                         goto iommu_map_failed;
 394                 }
 395
 396                 iommu_batch_new_entry(entry);
 397
 398                 /* Convert entry to a dma_addr_t */
 399                 dma_addr = iommu->page_table_map_base +
 400                         (entry << IO_PAGE_SHIFT);
 401                 dma_addr |= (s->offset & ~IO_PAGE_MASK);
 402
 403                 /* Insert into HW table */
 404                 paddr &= IO_PAGE_MASK;
 405                 while (npages--) {
 406                         err = iommu_batch_add(paddr);
 407                         if (unlikely(err < 0L))
 408                                 goto iommu_map_failed;
 409                         paddr += IO_PAGE_SIZE;
 410                 }
 411
 412                 /* If we are in an open segment, try merging */
 413                 if (segstart != s) {
 414                         /* We cannot merge if:
 415                          * - allocated dma_addr isn't contiguous to previous allocation
 416                          */
 417                         if ((dma_addr != dma_next) ||
 418                             (outs->dma_length + s->length > max_seg_size) ||
 419                             (is_span_boundary(out_entry, base_shift,
 420                                               seg_boundary_size, outs, s))) {
 421                                 /* Can't merge: create a new segment */
 422                                 segstart = s;
 423                                 outcount++;
 424                                 outs = sg_next(outs);
 425                         } else {
 426                                 outs->dma_length += s->length;
 427                         }
 428                 }
 429
 430                 if (segstart == s) {
 431                         /* This is a new segment, fill entries */
 432                         outs->dma_address = dma_addr;
 433                         outs->dma_length = slen;
 434                         out_entry = entry;
 435                 }
 436
 437                 /* Calculate next page pointer for contiguous check */
 438                 dma_next = dma_addr + slen;
 439         }
 440
 441         err = iommu_batch_end();
 442
 443         if (unlikely(err < 0L))
 444                 goto iommu_map_failed;
 445
 446         spin_unlock_irqrestore(&iommu->lock, flags);
 447
 448         if (outcount < incount) {
 449                 outs = sg_next(outs);
 450                 outs->dma_address = DMA_ERROR_CODE;
 451                 outs->dma_length = 0;
 452         }
 453
 454         return outcount;
 455
 456 iommu_map_failed:
 457         for_each_sg(sglist, s, nelems, i) {
 458                 if (s->dma_length != 0) {
 459                         unsigned long vaddr, npages;
 460
 461                         vaddr = s->dma_address & IO_PAGE_MASK;
 462                         npages = iommu_num_pages(s->dma_address, s->dma_length);
 463                         iommu_range_free(iommu, vaddr, npages);
 464                         /* XXX demap? XXX */
 465                         s->dma_address = DMA_ERROR_CODE;
 466                         s->dma_length = 0;
 467                 }
 468                 if (s == outs)
 469                         break;
 470         }
 471         spin_unlock_irqrestore(&iommu->lock, flags);
 472
 473         return 0;
 474 }
 475
 476 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
 477                             int nelems, enum dma_data_direction direction)
 478 {
 479         struct pci_pbm_info *pbm;
 480         struct scatterlist *sg;
 481         struct iommu *iommu;
 482         unsigned long flags;
 483         u32 devhandle;
 484
 485         BUG_ON(direction == DMA_NONE);
 486
 487         iommu = dev->archdata.iommu;
 488         pbm = dev->archdata.host_controller;
 489         devhandle = pbm->devhandle;
 490
 491         spin_lock_irqsave(&iommu->lock, flags);
 492
 493         sg = sglist;
 494         while (nelems--) {
 495                 dma_addr_t dma_handle = sg->dma_address;
 496                 unsigned int len = sg->dma_length;
 497                 unsigned long npages, entry;
 498
 499                 if (!len)
 500                         break;
 501                 npages = iommu_num_pages(dma_handle, len);
 502                 iommu_range_free(iommu, dma_handle, npages);
 503
 504                 entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 505                 while (npages) {
 506                         unsigned long num;
 507
 508                         num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 509                                                     npages);
 510                         entry += num;
 511                         npages -= num;
 512                 }
 513
 514                 sg = sg_next(sg);
 515         }
 516
 517         spin_unlock_irqrestore(&iommu->lock, flags);
 518 }
 519
 520 static void dma_4v_sync_single_for_cpu(struct device *dev,
 521                                        dma_addr_t bus_addr, size_t sz,
 522                                        enum dma_data_direction direction)
 523 {
 524         /* Nothing to do... */
 525 }
 526
 527 static void dma_4v_sync_sg_for_cpu(struct device *dev,
 528                                    struct scatterlist *sglist, int nelems,
 529                                    enum dma_data_direction direction)
 530 {
 531         /* Nothing to do... */
 532 }
 533
 534 static const struct dma_ops sun4v_dma_ops = {
 535         .alloc_coherent                 = dma_4v_alloc_coherent,
 536         .free_coherent                  = dma_4v_free_coherent,
 537         .map_single                     = dma_4v_map_single,
 538         .unmap_single                   = dma_4v_unmap_single,
 539         .map_sg                         = dma_4v_map_sg,
 540         .unmap_sg                       = dma_4v_unmap_sg,
 541         .sync_single_for_cpu            = dma_4v_sync_single_for_cpu,
 542         .sync_sg_for_cpu                = dma_4v_sync_sg_for_cpu,
 543 };
 544
 545 static void __init pci_sun4v_scan_bus(struct pci_pbm_info *pbm)
 546 {
 547         struct property *prop;
 548         struct device_node *dp;
 549
 550         dp = pbm->prom_node;
 551         prop = of_find_property(dp, "66mhz-capable", NULL);
 552         pbm->is_66mhz_capable = (prop != NULL);
 553         pbm->pci_bus = pci_scan_one_pbm(pbm);
 554
 555         /* XXX register error interrupt handlers XXX */
 556 }
 557
 558 static unsigned long __init probe_existing_entries(struct pci_pbm_info *pbm,
 559                                                    struct iommu *iommu)
 560 {
 561         struct iommu_arena *arena = &iommu->arena;
 562         unsigned long i, cnt = 0;
 563         u32 devhandle;
 564
 565         devhandle = pbm->devhandle;
 566         for (i = 0; i < arena->limit; i++) {
 567                 unsigned long ret, io_attrs, ra;
 568
 569                 ret = pci_sun4v_iommu_getmap(devhandle,
 570                                              HV_PCI_TSBID(0, i),
 571                                              &io_attrs, &ra);
 572                 if (ret == HV_EOK) {
 573                         if (page_in_phys_avail(ra)) {
 574                                 pci_sun4v_iommu_demap(devhandle,
 575                                                       HV_PCI_TSBID(0, i), 1);
 576                         } else {
 577                                 cnt++;
 578                                 __set_bit(i, arena->map);
 579                         }
 580                 }
 581         }
 582
 583         return cnt;
 584 }
 585
 586 static void __init pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 587 {
 588         struct iommu *iommu = pbm->iommu;
 589         struct property *prop;
 590         unsigned long num_tsb_entries, sz, tsbsize;
 591         u32 vdma[2], dma_mask, dma_offset;
 592
 593         prop = of_find_property(pbm->prom_node, "virtual-dma", NULL);
 594         if (prop) {
 595                 u32 *val = prop->value;
 596
 597                 vdma[0] = val[0];
 598                 vdma[1] = val[1];
 599         } else {
 600                 /* No property, use default values. */
 601                 vdma[0] = 0x80000000;
 602                 vdma[1] = 0x80000000;
 603         }
 604
 605         if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
 606                 prom_printf("PCI-SUN4V: strange virtual-dma[%08x:%08x].\n",
 607                             vdma[0], vdma[1]);
 608                 prom_halt();
 609         };
 610
 611         dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
 612         num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
 613         tsbsize = num_tsb_entries * sizeof(iopte_t);
 614
 615         dma_offset = vdma[0];
 616
 617         /* Setup initial software IOMMU state. */
 618         spin_lock_init(&iommu->lock);
 619         iommu->ctx_lowest_free = 1;
 620         iommu->page_table_map_base = dma_offset;
 621         iommu->dma_addr_mask = dma_mask;
 622
 623         /* Allocate and initialize the free area map.  */
 624         sz = (num_tsb_entries + 7) / 8;
 625         sz = (sz + 7UL) & ~7UL;
 626         iommu->arena.map = kzalloc(sz, GFP_KERNEL);
 627         if (!iommu->arena.map) {
 628                 prom_printf("PCI_IOMMU: Error, kmalloc(arena.map) failed.\n");
 629                 prom_halt();
 630         }
 631         iommu->arena.limit = num_tsb_entries;
 632
 633         sz = probe_existing_entries(pbm, iommu);
 634         if (sz)
 635                 printk("%s: Imported %lu TSB entries from OBP\n",
 636                        pbm->name, sz);
 637 }
 638
 639 #ifdef CONFIG_PCI_MSI
 640 struct pci_sun4v_msiq_entry {
 641         u64             version_type;
 642 #define MSIQ_VERSION_MASK               0xffffffff00000000UL
 643 #define MSIQ_VERSION_SHIFT              32
 644 #define MSIQ_TYPE_MASK                  0x00000000000000ffUL
 645 #define MSIQ_TYPE_SHIFT                 0
 646 #define MSIQ_TYPE_NONE                  0x00
 647 #define MSIQ_TYPE_MSG                   0x01
 648 #define MSIQ_TYPE_MSI32                 0x02
 649 #define MSIQ_TYPE_MSI64                 0x03
 650 #define MSIQ_TYPE_INTX                  0x08
 651 #define MSIQ_TYPE_NONE2                 0xff
 652
 653         u64             intx_sysino;
 654         u64             reserved1;
 655         u64             stick;
 656         u64             req_id;  /* bus/device/func */
 657 #define MSIQ_REQID_BUS_MASK             0xff00UL
 658 #define MSIQ_REQID_BUS_SHIFT            8
 659 #define MSIQ_REQID_DEVICE_MASK          0x00f8UL
 660 #define MSIQ_REQID_DEVICE_SHIFT         3
 661 #define MSIQ_REQID_FUNC_MASK            0x0007UL
 662 #define MSIQ_REQID_FUNC_SHIFT           0
 663
 664         u64             msi_address;
 665
 666         /* The format of this value is message type dependent.
 667          * For MSI bits 15:0 are the data from the MSI packet.
 668          * For MSI-X bits 31:0 are the data from the MSI packet.
 669          * For MSG, the message code and message routing code where:
 670          *      bits 39:32 is the bus/device/fn of the msg target-id
 671          *      bits 18:16 is the message routing code
 672          *      bits 7:0 is the message code
 673          * For INTx the low order 2-bits are:
 674          *      00 - INTA
 675          *      01 - INTB
 676          *      10 - INTC
 677          *      11 - INTD
 678          */
 679         u64             msi_data;
 680
 681         u64             reserved2;
 682 };
 683
 684 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 685                               unsigned long *head)
 686 {
 687         unsigned long err, limit;
 688
 689         err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head);
 690         if (unlikely(err))
 691                 return -ENXIO;
 692
 693         limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 694         if (unlikely(*head >= limit))
 695                 return -EFBIG;
 696
 697         return 0;
 698 }
 699
 700 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm,
 701                                  unsigned long msiqid, unsigned long *head,
 702                                  unsigned long *msi)
 703 {
 704         struct pci_sun4v_msiq_entry *ep;
 705         unsigned long err, type;
 706
 707         /* Note: void pointer arithmetic, 'head' is a byte offset  */
 708         ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) *
 709                                  (pbm->msiq_ent_count *
 710                                   sizeof(struct pci_sun4v_msiq_entry))) +
 711               *head);
 712
 713         if ((ep->version_type & MSIQ_TYPE_MASK) == 0)
 714                 return 0;
 715
 716         type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT;
 717         if (unlikely(type != MSIQ_TYPE_MSI32 &&
 718                      type != MSIQ_TYPE_MSI64))
 719                 return -EINVAL;
 720
 721         *msi = ep->msi_data;
 722
 723         err = pci_sun4v_msi_setstate(pbm->devhandle,
 724                                      ep->msi_data /* msi_num */,
 725                                      HV_MSISTATE_IDLE);
 726         if (unlikely(err))
 727                 return -ENXIO;
 728
 729         /* Clear the entry.  */
 730         ep->version_type &= ~MSIQ_TYPE_MASK;
 731
 732         (*head) += sizeof(struct pci_sun4v_msiq_entry);
 733         if (*head >=
 734             (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry)))
 735                 *head = 0;
 736
 737         return 1;
 738 }
 739
 740 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 741                               unsigned long head)
 742 {
 743         unsigned long err;
 744
 745         err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head);
 746         if (unlikely(err))
 747                 return -EINVAL;
 748
 749         return 0;
 750 }
 751
 752 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
 753                                unsigned long msi, int is_msi64)
 754 {
 755         if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid,
 756                                   (is_msi64 ?
 757                                    HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32)))
 758                 return -ENXIO;
 759         if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE))
 760                 return -ENXIO;
 761         if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID))
 762                 return -ENXIO;
 763         return 0;
 764 }
 765
 766 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
 767 {
 768         unsigned long err, msiqid;
 769
 770         err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid);
 771         if (err)
 772                 return -ENXIO;
 773
 774         pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID);
 775
 776         return 0;
 777 }
 778
 779 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm)
 780 {
 781         unsigned long q_size, alloc_size, pages, order;
 782         int i;
 783
 784         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 785         alloc_size = (pbm->msiq_num * q_size);
 786         order = get_order(alloc_size);
 787         pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
 788         if (pages == 0UL) {
 789                 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
 790                        order);
 791                 return -ENOMEM;
 792         }
 793         memset((char *)pages, 0, PAGE_SIZE << order);
 794         pbm->msi_queues = (void *) pages;
 795
 796         for (i = 0; i < pbm->msiq_num; i++) {
 797                 unsigned long err, base = __pa(pages + (i * q_size));
 798                 unsigned long ret1, ret2;
 799
 800                 err = pci_sun4v_msiq_conf(pbm->devhandle,
 801                                           pbm->msiq_first + i,
 802                                           base, pbm->msiq_ent_count);
 803                 if (err) {
 804                         printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n",
 805                                err);
 806                         goto h_error;
 807                 }
 808
 809                 err = pci_sun4v_msiq_info(pbm->devhandle,
 810                                           pbm->msiq_first + i,
 811                                           &ret1, &ret2);
 812                 if (err) {
 813                         printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n",
 814                                err);
 815                         goto h_error;
 816                 }
 817                 if (ret1 != base || ret2 != pbm->msiq_ent_count) {
 818                         printk(KERN_ERR "MSI: Bogus qconf "
 819                                "expected[%lx:%x] got[%lx:%lx]\n",
 820                                base, pbm->msiq_ent_count,
 821                                ret1, ret2);
 822                         goto h_error;
 823                 }
 824         }
 825
 826         return 0;
 827
 828 h_error:
 829         free_pages(pages, order);
 830         return -EINVAL;
 831 }
 832
 833 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm)
 834 {
 835         unsigned long q_size, alloc_size, pages, order;
 836         int i;
 837
 838         for (i = 0; i < pbm->msiq_num; i++) {
 839                 unsigned long msiqid = pbm->msiq_first + i;
 840
 841                 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0);
 842         }
 843
 844         q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
 845         alloc_size = (pbm->msiq_num * q_size);
 846         order = get_order(alloc_size);
 847
 848         pages = (unsigned long) pbm->msi_queues;
 849
 850         free_pages(pages, order);
 851
 852         pbm->msi_queues = NULL;
 853 }
 854
 855 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm,
 856                                     unsigned long msiqid,
 857                                     unsigned long devino)
 858 {
 859         unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino);
 860
 861         if (!virt_irq)
 862                 return -ENOMEM;
 863
 864         if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE))
 865                 return -EINVAL;
 866         if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID))
 867                 return -EINVAL;
 868
 869         return virt_irq;
 870 }
 871
 872 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = {
 873         .get_head       =       pci_sun4v_get_head,
 874         .dequeue_msi    =       pci_sun4v_dequeue_msi,
 875         .set_head       =       pci_sun4v_set_head,
 876         .msi_setup      =       pci_sun4v_msi_setup,
 877         .msi_teardown   =       pci_sun4v_msi_teardown,
 878         .msiq_alloc     =       pci_sun4v_msiq_alloc,
 879         .msiq_free      =       pci_sun4v_msiq_free,
 880         .msiq_build_irq =       pci_sun4v_msiq_build_irq,
 881 };
 882
 883 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 884 {
 885         sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops);
 886 }
 887 #else /* CONFIG_PCI_MSI */
 888 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
 889 {
 890 }
 891 #endif /* !(CONFIG_PCI_MSI) */
 892
 893 static void __init pci_sun4v_pbm_init(struct pci_controller_info *p,
 894                                       struct device_node *dp, u32 devhandle)
 895 {
 896         struct pci_pbm_info *pbm;
 897
 898         if (devhandle & 0x40)
 899                 pbm = &p->pbm_B;
 900         else
 901                 pbm = &p->pbm_A;
 902
 903         pbm->next = pci_pbm_root;
 904         pci_pbm_root = pbm;
 905
 906         pbm->numa_node = of_node_to_nid(dp);
 907
 908         pbm->scan_bus = pci_sun4v_scan_bus;
 909         pbm->pci_ops = &sun4v_pci_ops;
 910         pbm->config_space_reg_bits = 12;
 911
 912         pbm->index = pci_num_pbms++;
 913
 914         pbm->parent = p;
 915         pbm->prom_node = dp;
 916
 917         pbm->devhandle = devhandle;
 918
 919         pbm->name = dp->full_name;
 920
 921         printk("%s: SUN4V PCI Bus Module\n", pbm->name);
 922         printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node);
 923
 924         pci_determine_mem_io_space(pbm);
 925
 926         pci_get_pbm_props(pbm);
 927         pci_sun4v_iommu_init(pbm);
 928         pci_sun4v_msi_init(pbm);
 929 }
 930
 931 void __init sun4v_pci_init(struct device_node *dp, char *model_name)
 932 {
 933         static int hvapi_negotiated = 0;
 934         struct pci_controller_info *p;
 935         struct pci_pbm_info *pbm;
 936         struct iommu *iommu;
 937         struct property *prop;
 938         struct linux_prom64_registers *regs;
 939         u32 devhandle;
 940         int i;
 941
 942         if (!hvapi_negotiated++) {
 943                 int err = sun4v_hvapi_register(HV_GRP_PCI,
 944                                                vpci_major,
 945                                                &vpci_minor);
 946
 947                 if (err) {
 948                         prom_printf("SUN4V_PCI: Could not register hvapi, "
 949                                     "err=%d\n", err);
 950                         prom_halt();
 951                 }
 952                 printk("SUN4V_PCI: Registered hvapi major[%lu] minor[%lu]\n",
 953                        vpci_major, vpci_minor);
 954
 955                 dma_ops = &sun4v_dma_ops;
 956         }
 957
 958         prop = of_find_property(dp, "reg", NULL);
 959         if (!prop) {
 960                 prom_printf("SUN4V_PCI: Could not find config registers\n");
 961                 prom_halt();
 962         }
 963         regs = prop->value;
 964
 965         devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
 966
 967         for (pbm = pci_pbm_root; pbm; pbm = pbm->next) {
 968                 if (pbm->devhandle == (devhandle ^ 0x40)) {
 969                         pci_sun4v_pbm_init(pbm->parent, dp, devhandle);
 970                         return;
 971                 }
 972         }
 973
 974         for_each_possible_cpu(i) {
 975                 unsigned long page = get_zeroed_page(GFP_ATOMIC);
 976
 977                 if (!page)
 978                         goto fatal_memory_error;
 979
 980                 per_cpu(iommu_batch, i).pglist = (u64 *) page;
 981         }
 982
 983         p = kzalloc(sizeof(struct pci_controller_info), GFP_ATOMIC);
 984         if (!p)
 985                 goto fatal_memory_error;
 986
 987         iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
 988         if (!iommu)
 989                 goto fatal_memory_error;
 990
 991         p->pbm_A.iommu = iommu;
 992
 993         iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
 994         if (!iommu)
 995                 goto fatal_memory_error;
 996
 997         p->pbm_B.iommu = iommu;
 998
 999         pci_sun4v_pbm_init(p, dp, devhandle);
1000         return;
1001
1002 fatal_memory_error:
1003         prom_printf("SUN4V_PCI: Fatal memory allocation error.\n");
1004         prom_halt();
1005 }