git.oblomov.eu Git - linux-2.6/blob - 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 {
 237         struct iommu *iommu;
 238         unsigned long flags, npages, oaddr;
 239         unsigned long i, base_paddr;
 240         u32 bus_addr, ret;
 241         unsigned long prot;
 242         long entry;
 243
 244         iommu = dev->archdata.iommu;
 245
 246         if (unlikely(direction == DMA_NONE))
 247                 goto bad;
 248
 249         oaddr = (unsigned long)(page_address(page) + offset);
 250         npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
 251         npages >>= IO_PAGE_SHIFT;
 252
 253         spin_lock_irqsave(&iommu->lock, flags);
 254         entry = iommu_range_alloc(dev, iommu, npages, NULL);
 255         spin_unlock_irqrestore(&iommu->lock, flags);
 256
 257         if (unlikely(entry == DMA_ERROR_CODE))
 258                 goto bad;
 259
 260         bus_addr = (iommu->page_table_map_base +
 261                     (entry << IO_PAGE_SHIFT));
 262         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
 263         base_paddr = __pa(oaddr & IO_PAGE_MASK);
 264         prot = HV_PCI_MAP_ATTR_READ;
 265         if (direction != DMA_TO_DEVICE)
 266                 prot |= HV_PCI_MAP_ATTR_WRITE;
 267
 268         local_irq_save(flags);
 269
 270         iommu_batch_start(dev, prot, entry);
 271
 272         for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
 273                 long err = iommu_batch_add(base_paddr);
 274                 if (unlikely(err < 0L))
 275                         goto iommu_map_fail;
 276         }
 277         if (unlikely(iommu_batch_end() < 0L))
 278                 goto iommu_map_fail;
 279
 280         local_irq_restore(flags);
 281
 282         return ret;
 283
 284 bad:
 285         if (printk_ratelimit())
 286                 WARN_ON(1);
 287         return DMA_ERROR_CODE;
 288
 289 iommu_map_fail:
 290         /* Interrupts are disabled.  */
 291         spin_lock(&iommu->lock);
 292         iommu_range_free(iommu, bus_addr, npages);
 293         spin_unlock_irqrestore(&iommu->lock, flags);
 294
 295         return DMA_ERROR_CODE;
 296 }
 297
 298 static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
 299                               size_t sz, enum dma_data_direction direction)
 300 {
 301         struct pci_pbm_info *pbm;
 302         struct iommu *iommu;
 303         unsigned long flags, npages;
 304         long entry;
 305         u32 devhandle;
 306
 307         if (unlikely(direction == DMA_NONE)) {
 308                 if (printk_ratelimit())
 309                         WARN_ON(1);
 310                 return;
 311         }
 312
 313         iommu = dev->archdata.iommu;
 314         pbm = dev->archdata.host_controller;
 315         devhandle = pbm->devhandle;
 316
 317         npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
 318         npages >>= IO_PAGE_SHIFT;
 319         bus_addr &= IO_PAGE_MASK;
 320
 321         spin_lock_irqsave(&iommu->lock, flags);
 322
 323         iommu_range_free(iommu, bus_addr, npages);
 324
 325         entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
 326         do {
 327                 unsigned long num;
 328
 329                 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 330                                             npages);
 331                 entry += num;
 332                 npages -= num;
 333         } while (npages != 0);
 334
 335         spin_unlock_irqrestore(&iommu->lock, flags);
 336 }
 337
 338 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 339                          int nelems, enum dma_data_direction direction)
 340 {
 341         struct scatterlist *s, *outs, *segstart;
 342         unsigned long flags, handle, prot;
 343         dma_addr_t dma_next = 0, dma_addr;
 344         unsigned int max_seg_size;
 345         unsigned long seg_boundary_size;
 346         int outcount, incount, i;
 347         struct iommu *iommu;
 348         unsigned long base_shift;
 349         long err;
 350
 351         BUG_ON(direction == DMA_NONE);
 352
 353         iommu = dev->archdata.iommu;
 354         if (nelems == 0 || !iommu)
 355                 return 0;
 356
 357         prot = HV_PCI_MAP_ATTR_READ;
 358         if (direction != DMA_TO_DEVICE)
 359                 prot |= HV_PCI_MAP_ATTR_WRITE;
 360
 361         outs = s = segstart = &sglist[0];
 362         outcount = 1;
 363         incount = nelems;
 364         handle = 0;
 365
 366         /* Init first segment length for backout at failure */
 367         outs->dma_length = 0;
 368
 369         spin_lock_irqsave(&iommu->lock, flags);
 370
 371         iommu_batch_start(dev, prot, ~0UL);
 372
 373         max_seg_size = dma_get_max_seg_size(dev);
 374         seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
 375                                   IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
 376         base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
 377         for_each_sg(sglist, s, nelems, i) {
 378                 unsigned long paddr, npages, entry, out_entry = 0, slen;
 379
 380                 slen = s->length;
 381                 /* Sanity check */
 382                 if (slen == 0) {
 383                         dma_next = 0;
 384                         continue;
 385                 }
 386                 /* Allocate iommu entries for that segment */
 387                 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
 388                 npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE);
 389                 entry = iommu_range_alloc(dev, iommu, npages, &handle);
 390
 391                 /* Handle failure */
 392                 if (unlikely(entry == DMA_ERROR_CODE)) {
 393                         if (printk_ratelimit())
 394                                 printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
 395                                        " npages %lx\n", iommu, paddr, npages);
 396                         goto iommu_map_failed;
 397                 }
 398
 399                 iommu_batch_new_entry(entry);
 400
 401                 /* Convert entry to a dma_addr_t */
 402                 dma_addr = iommu->page_table_map_base +
 403                         (entry << IO_PAGE_SHIFT);
 404                 dma_addr |= (s->offset & ~IO_PAGE_MASK);
 405
 406                 /* Insert into HW table */
 407                 paddr &= IO_PAGE_MASK;
 408                 while (npages--) {
 409                         err = iommu_batch_add(paddr);
 410                         if (unlikely(err < 0L))
 411                                 goto iommu_map_failed;
 412                         paddr += IO_PAGE_SIZE;
 413                 }
 414
 415                 /* If we are in an open segment, try merging */
 416                 if (segstart != s) {
 417                         /* We cannot merge if:
 418                          * - allocated dma_addr isn't contiguous to previous allocation
 419                          */
 420                         if ((dma_addr != dma_next) ||
 421                             (outs->dma_length + s->length > max_seg_size) ||
 422                             (is_span_boundary(out_entry, base_shift,
 423                                               seg_boundary_size, outs, s))) {
 424                                 /* Can't merge: create a new segment */
 425                                 segstart = s;
 426                                 outcount++;
 427                                 outs = sg_next(outs);
 428                         } else {
 429                                 outs->dma_length += s->length;
 430                         }
 431                 }
 432
 433                 if (segstart == s) {
 434                         /* This is a new segment, fill entries */
 435                         outs->dma_address = dma_addr;
 436                         outs->dma_length = slen;
 437                         out_entry = entry;
 438                 }
 439
 440                 /* Calculate next page pointer for contiguous check */
 441                 dma_next = dma_addr + slen;
 442         }
 443
 444         err = iommu_batch_end();
 445
 446         if (unlikely(err < 0L))
 447                 goto iommu_map_failed;
 448
 449         spin_unlock_irqrestore(&iommu->lock, flags);
 450
 451         if (outcount < incount) {
 452                 outs = sg_next(outs);
 453                 outs->dma_address = DMA_ERROR_CODE;
 454                 outs->dma_length = 0;
 455         }
 456
 457         return outcount;
 458
 459 iommu_map_failed:
 460         for_each_sg(sglist, s, nelems, i) {
 461                 if (s->dma_length != 0) {
 462                         unsigned long vaddr, npages;
 463
 464                         vaddr = s->dma_address & IO_PAGE_MASK;
 465                         npages = iommu_num_pages(s->dma_address, s->dma_length,
 466                                                  IO_PAGE_SIZE);
 467                         iommu_range_free(iommu, vaddr, npages);
 468                         /* XXX demap? XXX */
 469                         s->dma_address = DMA_ERROR_CODE;
 470                         s->dma_length = 0;
 471                 }
 472                 if (s == outs)
 473                         break;
 474         }
 475         spin_unlock_irqrestore(&iommu->lock, flags);
 476
 477         return 0;
 478 }
 479
 480 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
 481                             int nelems, enum dma_data_direction direction)
 482 {
 483         struct pci_pbm_info *pbm;
 484         struct scatterlist *sg;
 485         struct iommu *iommu;
 486         unsigned long flags;
 487         u32 devhandle;
 488
 489         BUG_ON(direction == DMA_NONE);
 490
 491         iommu = dev->archdata.iommu;
 492         pbm = dev->archdata.host_controller;
 493         devhandle = pbm->devhandle;
 494
 495         spin_lock_irqsave(&iommu->lock, flags);
 496
 497         sg = sglist;
 498         while (nelems--) {
 499                 dma_addr_t dma_handle = sg->dma_address;
 500                 unsigned int len = sg->dma_length;
 501                 unsigned long npages, entry;
 502
 503                 if (!len)
 504                         break;
 505                 npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE);
 506                 iommu_range_free(iommu, dma_handle, npages);
 507
 508                 entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 509                 while (npages) {
 510                         unsigned long num;
 511
 512                         num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
 513                                                     npages);
 514                         entry += num;
 515                         npages -= num;
 516                 }
 517
 518                 sg = sg_next(sg);
 519         }
 520
 521         spin_unlock_irqrestore(&iommu->lock, flags);
 522 }
 523
 524 static void dma_4v_sync_single_for_cpu(struct device *dev,
 525                                        dma_addr_t bus_addr, size_t sz,
 526                                        enum dma_data_direction direction)
 527 {
 528         /* Nothing to do... */
 529 }
 530
 531 static void dma_4v_sync_sg_for_cpu(struct device *dev,
 532                                    struct scatterlist *sglist, int nelems,
 533                                    enum dma_data_direction direction)
 534 {
 535         /* Nothing to do... */
 536 }
 537
 538 static const struct dma_ops sun4v_dma_ops = {
 539         .alloc_coherent                 = dma_4v_alloc_coherent,
 540         .free_coherent                  = dma_4v_free_coherent,
 541         .map_page                       = dma_4v_map_page,
 542         .unmap_page                     = dma_4v_unmap_page,
 543         .map_sg                         = dma_4v_map_sg,
 544         .unmap_sg                       = dma_4v_unmap_sg,
 545         .sync_single_for_cpu            = dma_4v_sync_single_for_cpu,
 546         .sync_sg_for_cpu                = dma_4v_sync_sg_for_cpu,
 547 };
 548
 549 static void __devinit pci_sun4v_scan_bus(struct pci_pbm_info *pbm,
 550                                          struct device *parent)
 551 {
 552         struct property *prop;
 553         struct device_node *dp;
 554
 555         dp = pbm->op->node;
 556         prop = of_find_property(dp, "66mhz-capable", NULL);
 557         pbm->is_66mhz_capable = (prop != NULL);
 558         pbm->pci_bus = pci_scan_one_pbm(pbm, parent);
 559
 560         /* XXX register error interrupt handlers XXX */
 561 }
 562
 563 static unsigned long __devinit probe_existing_entries(struct pci_pbm_info *pbm,
 564                                                       struct iommu *iommu)
 565 {
 566         struct iommu_arena *arena = &iommu->arena;
 567         unsigned long i, cnt = 0;
 568         u32 devhandle;
 569
 570         devhandle = pbm->devhandle;
 571         for (i = 0; i < arena->limit; i++) {
 572                 unsigned long ret, io_attrs, ra;
 573
 574                 ret = pci_sun4v_iommu_getmap(devhandle,
 575                                              HV_PCI_TSBID(0, i),
 576                                              &io_attrs, &ra);
 577                 if (ret == HV_EOK) {
 578                         if (page_in_phys_avail(ra)) {
 579                                 pci_sun4v_iommu_demap(devhandle,
 580                                                       HV_PCI_TSBID(0, i), 1);
 581                         } else {
 582                                 cnt++;
 583                                 __set_bit(i, arena->map);
 584                         }
 585                 }
 586         }
 587
 588         return cnt;
 589 }
 590
 591 static int __devinit pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 592 {
 593         static const u32 vdma_default[] = { 0x80000000, 0x80000000 };
 594         struct iommu *iommu = pbm->iommu;
 595         unsigned long num_tsb_entries, sz, tsbsize;
 596         u32 dma_mask, dma_offset;
 597         const u32 *vdma;
 598
 599         vdma = of_get_property(pbm->op->node, "virtual-dma", NULL);
 600         if (!vdma)
 601                 vdma = vdma_default;
 602
 603         if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
 604                 printk(KERN_ERR PFX "Strange virtual-dma[%08x:%08x].\n",
 605                        vdma[0], vdma[1]);
 606                 return -EINVAL;
 607         };
 608
 609         dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
 610         num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
 611         tsbsize = num_tsb_entries * sizeof(iopte_t);
 612
 613         dma_offset = vdma[0];
 614
 615         /* Setup initial software IOMMU state. */
 616         spin_lock_init(&iommu->lock);
 617         iommu->ctx_lowest_free = 1;
 618         iommu->page_table_map_base = dma_offset;
 619         iommu->dma_addr_mask = dma_mask;
 620
 621         /* Allocate and initialize the free area map.  */
 622         sz = (num_tsb_entries + 7) / 8;
 623         sz = (sz + 7UL) & ~7UL;
 624         iommu->arena.map = kzalloc(sz, GFP_KERNEL);
 625         if (!iommu->arena.map) {
 626                 printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n");
 627                 return -ENOMEM;
 628         }
 629         iommu->arena.limit = num_tsb_entries;
 630
 631         sz = probe_existing_entries(pbm, iommu);
 632         if (sz)
 633                 printk("%s: Imported %lu TSB entries from OBP\n",
 634                        pbm->name, sz);
 635
 636         return 0;
 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 int __devinit pci_sun4v_pbm_init(struct pci_pbm_info *pbm,
 894                                         struct of_device *op, u32 devhandle)
 895 {
 896         struct device_node *dp = op->node;
 897         int err;
 898
 899         pbm->numa_node = of_node_to_nid(dp);
 900
 901         pbm->pci_ops = &sun4v_pci_ops;
 902         pbm->config_space_reg_bits = 12;
 903
 904         pbm->index = pci_num_pbms++;
 905
 906         pbm->op = op;
 907
 908         pbm->devhandle = devhandle;
 909
 910         pbm->name = dp->full_name;
 911
 912         printk("%s: SUN4V PCI Bus Module\n", pbm->name);
 913         printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node);
 914
 915         pci_determine_mem_io_space(pbm);
 916
 917         pci_get_pbm_props(pbm);
 918
 919         err = pci_sun4v_iommu_init(pbm);
 920         if (err)
 921                 return err;
 922
 923         pci_sun4v_msi_init(pbm);
 924
 925         pci_sun4v_scan_bus(pbm, &op->dev);
 926
 927         pbm->next = pci_pbm_root;
 928         pci_pbm_root = pbm;
 929
 930         return 0;
 931 }
 932
 933 static int __devinit pci_sun4v_probe(struct of_device *op,
 934                                      const struct of_device_id *match)
 935 {
 936         const struct linux_prom64_registers *regs;
 937         static int hvapi_negotiated = 0;
 938         struct pci_pbm_info *pbm;
 939         struct device_node *dp;
 940         struct iommu *iommu;
 941         u32 devhandle;
 942         int i, err;
 943
 944         dp = op->node;
 945
 946         if (!hvapi_negotiated++) {
 947                 err = sun4v_hvapi_register(HV_GRP_PCI,
 948                                            vpci_major,
 949                                            &vpci_minor);
 950
 951                 if (err) {
 952                         printk(KERN_ERR PFX "Could not register hvapi, "
 953                                "err=%d\n", err);
 954                         return err;
 955                 }
 956                 printk(KERN_INFO PFX "Registered hvapi major[%lu] minor[%lu]\n",
 957                        vpci_major, vpci_minor);
 958
 959                 dma_ops = &sun4v_dma_ops;
 960         }
 961
 962         regs = of_get_property(dp, "reg", NULL);
 963         err = -ENODEV;
 964         if (!regs) {
 965                 printk(KERN_ERR PFX "Could not find config registers\n");
 966                 goto out_err;
 967         }
 968         devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
 969
 970         err = -ENOMEM;
 971         if (!iommu_batch_initialized) {
 972                 for_each_possible_cpu(i) {
 973                         unsigned long page = get_zeroed_page(GFP_KERNEL);
 974
 975                         if (!page)
 976                                 goto out_err;
 977
 978                         per_cpu(iommu_batch, i).pglist = (u64 *) page;
 979                 }
 980                 iommu_batch_initialized = 1;
 981         }
 982
 983         pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
 984         if (!pbm) {
 985                 printk(KERN_ERR PFX "Could not allocate pci_pbm_info\n");
 986                 goto out_err;
 987         }
 988
 989         iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL);
 990         if (!iommu) {
 991                 printk(KERN_ERR PFX "Could not allocate pbm iommu\n");
 992                 goto out_free_controller;
 993         }
 994
 995         pbm->iommu = iommu;
 996
 997         err = pci_sun4v_pbm_init(pbm, op, devhandle);
 998         if (err)
 999                 goto out_free_iommu;
1000
1001         dev_set_drvdata(&op->dev, pbm);
1002
1003         return 0;
1004
1005 out_free_iommu:
1006         kfree(pbm->iommu);
1007
1008 out_free_controller:
1009         kfree(pbm);
1010
1011 out_err:
1012         return err;
1013 }
1014
1015 static struct of_device_id __initdata pci_sun4v_match[] = {
1016         {
1017                 .name = "pci",
1018                 .compatible = "SUNW,sun4v-pci",
1019         },
1020         {},
1021 };
1022
1023 static struct of_platform_driver pci_sun4v_driver = {
1024         .name           = DRIVER_NAME,
1025         .match_table    = pci_sun4v_match,
1026         .probe          = pci_sun4v_probe,
1027 };
1028
1029 static int __init pci_sun4v_init(void)
1030 {
1031         return of_register_driver(&pci_sun4v_driver, &of_bus_type);
1032 }
1033
1034 subsys_initcall(pci_sun4v_init);