arch/s390/pci/pci.c

   1 /*
   2  * Copyright IBM Corp. 2012
   3  *
   4  * Author(s):
   5  *   Jan Glauber <jang@linux.vnet.ibm.com>
   6  *
   7  * The System z PCI code is a rewrite from a prototype by
   8  * the following people (Kudoz!):
   9  *   Alexander Schmidt
  10  *   Christoph Raisch
  11  *   Hannes Hering
  12  *   Hoang-Nam Nguyen
  13  *   Jan-Bernd Themann
  14  *   Stefan Roscher
  15  *   Thomas Klein
  16  */
  17
  18 #define KMSG_COMPONENT "zpci"
  19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  20
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/err.h>
  24 #include <linux/export.h>
  25 #include <linux/delay.h>
  26 #include <linux/irq.h>
  27 #include <linux/kernel_stat.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/pci.h>
  30 #include <linux/msi.h>
  31
  32 #include <asm/isc.h>
  33 #include <asm/airq.h>
  34 #include <asm/facility.h>
  35 #include <asm/pci_insn.h>
  36 #include <asm/pci_clp.h>
  37 #include <asm/pci_dma.h>
  38
  39 #define DEBUG                           /* enable pr_debug */
  40
  41 #define SIC_IRQ_MODE_ALL                0
  42 #define SIC_IRQ_MODE_SINGLE             1
  43
  44 #define ZPCI_NR_DMA_SPACES              1
  45 #define ZPCI_NR_DEVICES                 CONFIG_PCI_NR_FUNCTIONS
  46
  47 /* list of all detected zpci devices */
  48 static LIST_HEAD(zpci_list);
  49 static DEFINE_SPINLOCK(zpci_list_lock);
  50
  51 static struct irq_chip zpci_irq_chip = {
  52         .name = "zPCI",
  53         .irq_unmask = pci_msi_unmask_irq,
  54         .irq_mask = pci_msi_mask_irq,
  55 };
  56
  57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
  58 static DEFINE_SPINLOCK(zpci_domain_lock);
  59
  60 static struct airq_iv *zpci_aisb_iv;
  61 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
  62
  63 /* Adapter interrupt definitions */
  64 static void zpci_irq_handler(struct airq_struct *airq);
  65
  66 static struct airq_struct zpci_airq = {
  67         .handler = zpci_irq_handler,
  68         .isc = PCI_ISC,
  69 };
  70
  71 #define ZPCI_IOMAP_ENTRIES                                              \
  72         min(((unsigned long) CONFIG_PCI_NR_FUNCTIONS * PCI_BAR_COUNT),  \
  73             ZPCI_IOMAP_MAX_ENTRIES)
  74
  75 static DEFINE_SPINLOCK(zpci_iomap_lock);
  76 static unsigned long *zpci_iomap_bitmap;
  77 struct zpci_iomap_entry *zpci_iomap_start;
  78 EXPORT_SYMBOL_GPL(zpci_iomap_start);
  79
  80 static struct kmem_cache *zdev_fmb_cache;
  81
  82 struct zpci_dev *get_zdev_by_fid(u32 fid)
  83 {
  84         struct zpci_dev *tmp, *zdev = NULL;
  85
  86         spin_lock(&zpci_list_lock);
  87         list_for_each_entry(tmp, &zpci_list, entry) {
  88                 if (tmp->fid == fid) {
  89                         zdev = tmp;
  90                         break;
  91                 }
  92         }
  93         spin_unlock(&zpci_list_lock);
  94         return zdev;
  95 }
  96
  97 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
  98 {
  99         return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
 100 }
 101
 102 int pci_domain_nr(struct pci_bus *bus)
 103 {
 104         return ((struct zpci_dev *) bus->sysdata)->domain;
 105 }
 106 EXPORT_SYMBOL_GPL(pci_domain_nr);
 107
 108 int pci_proc_domain(struct pci_bus *bus)
 109 {
 110         return pci_domain_nr(bus);
 111 }
 112 EXPORT_SYMBOL_GPL(pci_proc_domain);
 113
 114 /* Modify PCI: Register adapter interruptions */
 115 static int zpci_set_airq(struct zpci_dev *zdev)
 116 {
 117         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
 118         struct zpci_fib fib = {0};
 119
 120         fib.isc = PCI_ISC;
 121         fib.sum = 1;            /* enable summary notifications */
 122         fib.noi = airq_iv_end(zdev->aibv);
 123         fib.aibv = (unsigned long) zdev->aibv->vector;
 124         fib.aibvo = 0;          /* each zdev has its own interrupt vector */
 125         fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
 126         fib.aisbo = zdev->aisb & 63;
 127
 128         return zpci_mod_fc(req, &fib);
 129 }
 130
 131 struct mod_pci_args {
 132         u64 base;
 133         u64 limit;
 134         u64 iota;
 135         u64 fmb_addr;
 136 };
 137
 138 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
 139 {
 140         u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
 141         struct zpci_fib fib = {0};
 142
 143         fib.pba = args->base;
 144         fib.pal = args->limit;
 145         fib.iota = args->iota;
 146         fib.fmb_addr = args->fmb_addr;
 147
 148         return zpci_mod_fc(req, &fib);
 149 }
 150
 151 /* Modify PCI: Register I/O address translation parameters */
 152 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
 153                        u64 base, u64 limit, u64 iota)
 154 {
 155         struct mod_pci_args args = { base, limit, iota, 0 };
 156
 157         WARN_ON_ONCE(iota & 0x3fff);
 158         args.iota |= ZPCI_IOTA_RTTO_FLAG;
 159         return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
 160 }
 161
 162 /* Modify PCI: Unregister I/O address translation parameters */
 163 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
 164 {
 165         struct mod_pci_args args = { 0, 0, 0, 0 };
 166
 167         return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
 168 }
 169
 170 /* Modify PCI: Unregister adapter interruptions */
 171 static int zpci_clear_airq(struct zpci_dev *zdev)
 172 {
 173         struct mod_pci_args args = { 0, 0, 0, 0 };
 174
 175         return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
 176 }
 177
 178 /* Modify PCI: Set PCI function measurement parameters */
 179 int zpci_fmb_enable_device(struct zpci_dev *zdev)
 180 {
 181         struct mod_pci_args args = { 0, 0, 0, 0 };
 182
 183         if (zdev->fmb)
 184                 return -EINVAL;
 185
 186         zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
 187         if (!zdev->fmb)
 188                 return -ENOMEM;
 189         WARN_ON((u64) zdev->fmb & 0xf);
 190
 191         /* reset software counters */
 192         atomic64_set(&zdev->allocated_pages, 0);
 193         atomic64_set(&zdev->mapped_pages, 0);
 194         atomic64_set(&zdev->unmapped_pages, 0);
 195
 196         args.fmb_addr = virt_to_phys(zdev->fmb);
 197         return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
 198 }
 199
 200 /* Modify PCI: Disable PCI function measurement */
 201 int zpci_fmb_disable_device(struct zpci_dev *zdev)
 202 {
 203         struct mod_pci_args args = { 0, 0, 0, 0 };
 204         int rc;
 205
 206         if (!zdev->fmb)
 207                 return -EINVAL;
 208
 209         /* Function measurement is disabled if fmb address is zero */
 210         rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
 211
 212         kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 213         zdev->fmb = NULL;
 214         return rc;
 215 }
 216
 217 #define ZPCI_PCIAS_CFGSPC       15
 218
 219 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
 220 {
 221         u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 222         u64 data;
 223         int rc;
 224
 225         rc = zpci_load(&data, req, offset);
 226         if (!rc) {
 227                 data = data << ((8 - len) * 8);
 228                 data = le64_to_cpu(data);
 229                 *val = (u32) data;
 230         } else
 231                 *val = 0xffffffff;
 232         return rc;
 233 }
 234
 235 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
 236 {
 237         u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 238         u64 data = val;
 239         int rc;
 240
 241         data = cpu_to_le64(data);
 242         data = data >> ((8 - len) * 8);
 243         rc = zpci_store(data, req, offset);
 244         return rc;
 245 }
 246
 247 void pcibios_fixup_bus(struct pci_bus *bus)
 248 {
 249 }
 250
 251 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 252                                        resource_size_t size,
 253                                        resource_size_t align)
 254 {
 255         return 0;
 256 }
 257
 258 /* combine single writes by using store-block insn */
 259 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
 260 {
 261        zpci_memcpy_toio(to, from, count);
 262 }
 263
 264 /* Create a virtual mapping cookie for a PCI BAR */
 265 void __iomem *pci_iomap_range(struct pci_dev *pdev,
 266                               int bar,
 267                               unsigned long offset,
 268                               unsigned long max)
 269 {
 270         struct zpci_dev *zdev = to_zpci(pdev);
 271         int idx;
 272
 273         if (!pci_resource_len(pdev, bar))
 274                 return NULL;
 275
 276         idx = zdev->bars[bar].map_idx;
 277         spin_lock(&zpci_iomap_lock);
 278         /* Detect overrun */
 279         WARN_ON(!++zpci_iomap_start[idx].count);
 280         zpci_iomap_start[idx].fh = zdev->fh;
 281         zpci_iomap_start[idx].bar = bar;
 282         spin_unlock(&zpci_iomap_lock);
 283
 284         return (void __iomem *) ZPCI_ADDR(idx) + offset;
 285 }
 286 EXPORT_SYMBOL(pci_iomap_range);
 287
 288 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 289 {
 290         return pci_iomap_range(dev, bar, 0, maxlen);
 291 }
 292 EXPORT_SYMBOL(pci_iomap);
 293
 294 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
 295 {
 296         unsigned int idx = ZPCI_IDX(addr);
 297
 298         spin_lock(&zpci_iomap_lock);
 299         /* Detect underrun */
 300         WARN_ON(!zpci_iomap_start[idx].count);
 301         if (!--zpci_iomap_start[idx].count) {
 302                 zpci_iomap_start[idx].fh = 0;
 303                 zpci_iomap_start[idx].bar = 0;
 304         }
 305         spin_unlock(&zpci_iomap_lock);
 306 }
 307 EXPORT_SYMBOL(pci_iounmap);
 308
 309 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 310                     int size, u32 *val)
 311 {
 312         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 313         int ret;
 314
 315         if (!zdev || devfn != ZPCI_DEVFN)
 316                 ret = -ENODEV;
 317         else
 318                 ret = zpci_cfg_load(zdev, where, val, size);
 319
 320         return ret;
 321 }
 322
 323 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 324                      int size, u32 val)
 325 {
 326         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 327         int ret;
 328
 329         if (!zdev || devfn != ZPCI_DEVFN)
 330                 ret = -ENODEV;
 331         else
 332                 ret = zpci_cfg_store(zdev, where, val, size);
 333
 334         return ret;
 335 }
 336
 337 static struct pci_ops pci_root_ops = {
 338         .read = pci_read,
 339         .write = pci_write,
 340 };
 341
 342 static void zpci_irq_handler(struct airq_struct *airq)
 343 {
 344         unsigned long si, ai;
 345         struct airq_iv *aibv;
 346         int irqs_on = 0;
 347
 348         inc_irq_stat(IRQIO_PCI);
 349         for (si = 0;;) {
 350                 /* Scan adapter summary indicator bit vector */
 351                 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
 352                 if (si == -1UL) {
 353                         if (irqs_on++)
 354                                 /* End of second scan with interrupts on. */
 355                                 break;
 356                         /* First scan complete, reenable interrupts. */
 357                         zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
 358                         si = 0;
 359                         continue;
 360                 }
 361
 362                 /* Scan the adapter interrupt vector for this device. */
 363                 aibv = zpci_aibv[si];
 364                 for (ai = 0;;) {
 365                         ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
 366                         if (ai == -1UL)
 367                                 break;
 368                         inc_irq_stat(IRQIO_MSI);
 369                         airq_iv_lock(aibv, ai);
 370                         generic_handle_irq(airq_iv_get_data(aibv, ai));
 371                         airq_iv_unlock(aibv, ai);
 372                 }
 373         }
 374 }
 375
 376 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 377 {
 378         struct zpci_dev *zdev = to_zpci(pdev);
 379         unsigned int hwirq, msi_vecs;
 380         unsigned long aisb;
 381         struct msi_desc *msi;
 382         struct msi_msg msg;
 383         int rc, irq;
 384
 385         if (type == PCI_CAP_ID_MSI && nvec > 1)
 386                 return 1;
 387         msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
 388
 389         /* Allocate adapter summary indicator bit */
 390         rc = -EIO;
 391         aisb = airq_iv_alloc_bit(zpci_aisb_iv);
 392         if (aisb == -1UL)
 393                 goto out;
 394         zdev->aisb = aisb;
 395
 396         /* Create adapter interrupt vector */
 397         rc = -ENOMEM;
 398         zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
 399         if (!zdev->aibv)
 400                 goto out_si;
 401
 402         /* Wire up shortcut pointer */
 403         zpci_aibv[aisb] = zdev->aibv;
 404
 405         /* Request MSI interrupts */
 406         hwirq = 0;
 407         for_each_pci_msi_entry(msi, pdev) {
 408                 rc = -EIO;
 409                 irq = irq_alloc_desc(0);        /* Alloc irq on node 0 */
 410                 if (irq < 0)
 411                         goto out_msi;
 412                 rc = irq_set_msi_desc(irq, msi);
 413                 if (rc)
 414                         goto out_msi;
 415                 irq_set_chip_and_handler(irq, &zpci_irq_chip,
 416                                          handle_simple_irq);
 417                 msg.data = hwirq;
 418                 msg.address_lo = zdev->msi_addr & 0xffffffff;
 419                 msg.address_hi = zdev->msi_addr >> 32;
 420                 pci_write_msi_msg(irq, &msg);
 421                 airq_iv_set_data(zdev->aibv, hwirq, irq);
 422                 hwirq++;
 423         }
 424
 425         /* Enable adapter interrupts */
 426         rc = zpci_set_airq(zdev);
 427         if (rc)
 428                 goto out_msi;
 429
 430         return (msi_vecs == nvec) ? 0 : msi_vecs;
 431
 432 out_msi:
 433         for_each_pci_msi_entry(msi, pdev) {
 434                 if (hwirq-- == 0)
 435                         break;
 436                 irq_set_msi_desc(msi->irq, NULL);
 437                 irq_free_desc(msi->irq);
 438                 msi->msg.address_lo = 0;
 439                 msi->msg.address_hi = 0;
 440                 msi->msg.data = 0;
 441                 msi->irq = 0;
 442         }
 443         zpci_aibv[aisb] = NULL;
 444         airq_iv_release(zdev->aibv);
 445 out_si:
 446         airq_iv_free_bit(zpci_aisb_iv, aisb);
 447 out:
 448         return rc;
 449 }
 450
 451 void arch_teardown_msi_irqs(struct pci_dev *pdev)
 452 {
 453         struct zpci_dev *zdev = to_zpci(pdev);
 454         struct msi_desc *msi;
 455         int rc;
 456
 457         /* Disable adapter interrupts */
 458         rc = zpci_clear_airq(zdev);
 459         if (rc)
 460                 return;
 461
 462         /* Release MSI interrupts */
 463         for_each_pci_msi_entry(msi, pdev) {
 464                 if (msi->msi_attrib.is_msix)
 465                         __pci_msix_desc_mask_irq(msi, 1);
 466                 else
 467                         __pci_msi_desc_mask_irq(msi, 1, 1);
 468                 irq_set_msi_desc(msi->irq, NULL);
 469                 irq_free_desc(msi->irq);
 470                 msi->msg.address_lo = 0;
 471                 msi->msg.address_hi = 0;
 472                 msi->msg.data = 0;
 473                 msi->irq = 0;
 474         }
 475
 476         zpci_aibv[zdev->aisb] = NULL;
 477         airq_iv_release(zdev->aibv);
 478         airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
 479 }
 480
 481 static void zpci_map_resources(struct pci_dev *pdev)
 482 {
 483         resource_size_t len;
 484         int i;
 485
 486         for (i = 0; i < PCI_BAR_COUNT; i++) {
 487                 len = pci_resource_len(pdev, i);
 488                 if (!len)
 489                         continue;
 490                 pdev->resource[i].start =
 491                         (resource_size_t __force) pci_iomap(pdev, i, 0);
 492                 pdev->resource[i].end = pdev->resource[i].start + len - 1;
 493         }
 494 }
 495
 496 static void zpci_unmap_resources(struct pci_dev *pdev)
 497 {
 498         resource_size_t len;
 499         int i;
 500
 501         for (i = 0; i < PCI_BAR_COUNT; i++) {
 502                 len = pci_resource_len(pdev, i);
 503                 if (!len)
 504                         continue;
 505                 pci_iounmap(pdev, (void __iomem __force *)
 506                             pdev->resource[i].start);
 507         }
 508 }
 509
 510 static int __init zpci_irq_init(void)
 511 {
 512         int rc;
 513
 514         rc = register_adapter_interrupt(&zpci_airq);
 515         if (rc)
 516                 goto out;
 517         /* Set summary to 1 to be called every time for the ISC. */
 518         *zpci_airq.lsi_ptr = 1;
 519
 520         rc = -ENOMEM;
 521         zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
 522         if (!zpci_aisb_iv)
 523                 goto out_airq;
 524
 525         zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
 526         return 0;
 527
 528 out_airq:
 529         unregister_adapter_interrupt(&zpci_airq);
 530 out:
 531         return rc;
 532 }
 533
 534 static void zpci_irq_exit(void)
 535 {
 536         airq_iv_release(zpci_aisb_iv);
 537         unregister_adapter_interrupt(&zpci_airq);
 538 }
 539
 540 static int zpci_alloc_iomap(struct zpci_dev *zdev)
 541 {
 542         unsigned long entry;
 543
 544         spin_lock(&zpci_iomap_lock);
 545         entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
 546         if (entry == ZPCI_IOMAP_ENTRIES) {
 547                 spin_unlock(&zpci_iomap_lock);
 548                 return -ENOSPC;
 549         }
 550         set_bit(entry, zpci_iomap_bitmap);
 551         spin_unlock(&zpci_iomap_lock);
 552         return entry;
 553 }
 554
 555 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
 556 {
 557         spin_lock(&zpci_iomap_lock);
 558         memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
 559         clear_bit(entry, zpci_iomap_bitmap);
 560         spin_unlock(&zpci_iomap_lock);
 561 }
 562
 563 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
 564                                     unsigned long size, unsigned long flags)
 565 {
 566         struct resource *r;
 567
 568         r = kzalloc(sizeof(*r), GFP_KERNEL);
 569         if (!r)
 570                 return NULL;
 571
 572         r->start = start;
 573         r->end = r->start + size - 1;
 574         r->flags = flags;
 575         r->name = zdev->res_name;
 576
 577         if (request_resource(&iomem_resource, r)) {
 578                 kfree(r);
 579                 return NULL;
 580         }
 581         return r;
 582 }
 583
 584 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
 585                                     struct list_head *resources)
 586 {
 587         unsigned long addr, size, flags;
 588         struct resource *res;
 589         int i, entry;
 590
 591         snprintf(zdev->res_name, sizeof(zdev->res_name),
 592                  "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
 593
 594         for (i = 0; i < PCI_BAR_COUNT; i++) {
 595                 if (!zdev->bars[i].size)
 596                         continue;
 597                 entry = zpci_alloc_iomap(zdev);
 598                 if (entry < 0)
 599                         return entry;
 600                 zdev->bars[i].map_idx = entry;
 601
 602                 /* only MMIO is supported */
 603                 flags = IORESOURCE_MEM;
 604                 if (zdev->bars[i].val & 8)
 605                         flags |= IORESOURCE_PREFETCH;
 606                 if (zdev->bars[i].val & 4)
 607                         flags |= IORESOURCE_MEM_64;
 608
 609                 addr = ZPCI_ADDR(entry);
 610                 size = 1UL << zdev->bars[i].size;
 611
 612                 res = __alloc_res(zdev, addr, size, flags);
 613                 if (!res) {
 614                         zpci_free_iomap(zdev, entry);
 615                         return -ENOMEM;
 616                 }
 617                 zdev->bars[i].res = res;
 618                 pci_add_resource(resources, res);
 619         }
 620
 621         return 0;
 622 }
 623
 624 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
 625 {
 626         int i;
 627
 628         for (i = 0; i < PCI_BAR_COUNT; i++) {
 629                 if (!zdev->bars[i].size || !zdev->bars[i].res)
 630                         continue;
 631
 632                 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
 633                 release_resource(zdev->bars[i].res);
 634                 kfree(zdev->bars[i].res);
 635         }
 636 }
 637
 638 int pcibios_add_device(struct pci_dev *pdev)
 639 {
 640         struct resource *res;
 641         int i;
 642
 643         pdev->dev.groups = zpci_attr_groups;
 644         pdev->dev.archdata.dma_ops = &s390_pci_dma_ops;
 645         zpci_map_resources(pdev);
 646
 647         for (i = 0; i < PCI_BAR_COUNT; i++) {
 648                 res = &pdev->resource[i];
 649                 if (res->parent || !res->flags)
 650                         continue;
 651                 pci_claim_resource(pdev, i);
 652         }
 653
 654         return 0;
 655 }
 656
 657 void pcibios_release_device(struct pci_dev *pdev)
 658 {
 659         zpci_unmap_resources(pdev);
 660 }
 661
 662 int pcibios_enable_device(struct pci_dev *pdev, int mask)
 663 {
 664         struct zpci_dev *zdev = to_zpci(pdev);
 665
 666         zpci_debug_init_device(zdev, dev_name(&pdev->dev));
 667         zpci_fmb_enable_device(zdev);
 668
 669         return pci_enable_resources(pdev, mask);
 670 }
 671
 672 void pcibios_disable_device(struct pci_dev *pdev)
 673 {
 674         struct zpci_dev *zdev = to_zpci(pdev);
 675
 676         zpci_fmb_disable_device(zdev);
 677         zpci_debug_exit_device(zdev);
 678 }
 679
 680 #ifdef CONFIG_HIBERNATE_CALLBACKS
 681 static int zpci_restore(struct device *dev)
 682 {
 683         struct pci_dev *pdev = to_pci_dev(dev);
 684         struct zpci_dev *zdev = to_zpci(pdev);
 685         int ret = 0;
 686
 687         if (zdev->state != ZPCI_FN_STATE_ONLINE)
 688                 goto out;
 689
 690         ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 691         if (ret)
 692                 goto out;
 693
 694         zpci_map_resources(pdev);
 695         zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
 696                            (u64) zdev->dma_table);
 697
 698 out:
 699         return ret;
 700 }
 701
 702 static int zpci_freeze(struct device *dev)
 703 {
 704         struct pci_dev *pdev = to_pci_dev(dev);
 705         struct zpci_dev *zdev = to_zpci(pdev);
 706
 707         if (zdev->state != ZPCI_FN_STATE_ONLINE)
 708                 return 0;
 709
 710         zpci_unregister_ioat(zdev, 0);
 711         zpci_unmap_resources(pdev);
 712         return clp_disable_fh(zdev);
 713 }
 714
 715 struct dev_pm_ops pcibios_pm_ops = {
 716         .thaw_noirq = zpci_restore,
 717         .freeze_noirq = zpci_freeze,
 718         .restore_noirq = zpci_restore,
 719         .poweroff_noirq = zpci_freeze,
 720 };
 721 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 722
 723 static int zpci_alloc_domain(struct zpci_dev *zdev)
 724 {
 725         spin_lock(&zpci_domain_lock);
 726         zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
 727         if (zdev->domain == ZPCI_NR_DEVICES) {
 728                 spin_unlock(&zpci_domain_lock);
 729                 return -ENOSPC;
 730         }
 731         set_bit(zdev->domain, zpci_domain);
 732         spin_unlock(&zpci_domain_lock);
 733         return 0;
 734 }
 735
 736 static void zpci_free_domain(struct zpci_dev *zdev)
 737 {
 738         spin_lock(&zpci_domain_lock);
 739         clear_bit(zdev->domain, zpci_domain);
 740         spin_unlock(&zpci_domain_lock);
 741 }
 742
 743 void pcibios_remove_bus(struct pci_bus *bus)
 744 {
 745         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 746
 747         zpci_exit_slot(zdev);
 748         zpci_cleanup_bus_resources(zdev);
 749         zpci_free_domain(zdev);
 750
 751         spin_lock(&zpci_list_lock);
 752         list_del(&zdev->entry);
 753         spin_unlock(&zpci_list_lock);
 754
 755         kfree(zdev);
 756 }
 757
 758 static int zpci_scan_bus(struct zpci_dev *zdev)
 759 {
 760         LIST_HEAD(resources);
 761         int ret;
 762
 763         ret = zpci_setup_bus_resources(zdev, &resources);
 764         if (ret)
 765                 goto error;
 766
 767         zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
 768                                       zdev, &resources);
 769         if (!zdev->bus) {
 770                 ret = -EIO;
 771                 goto error;
 772         }
 773         zdev->bus->max_bus_speed = zdev->max_bus_speed;
 774         pci_bus_add_devices(zdev->bus);
 775         return 0;
 776
 777 error:
 778         zpci_cleanup_bus_resources(zdev);
 779         pci_free_resource_list(&resources);
 780         return ret;
 781 }
 782
 783 int zpci_enable_device(struct zpci_dev *zdev)
 784 {
 785         int rc;
 786
 787         rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 788         if (rc)
 789                 goto out;
 790
 791         rc = zpci_dma_init_device(zdev);
 792         if (rc)
 793                 goto out_dma;
 794
 795         zdev->state = ZPCI_FN_STATE_ONLINE;
 796         return 0;
 797
 798 out_dma:
 799         clp_disable_fh(zdev);
 800 out:
 801         return rc;
 802 }
 803 EXPORT_SYMBOL_GPL(zpci_enable_device);
 804
 805 int zpci_disable_device(struct zpci_dev *zdev)
 806 {
 807         zpci_dma_exit_device(zdev);
 808         return clp_disable_fh(zdev);
 809 }
 810 EXPORT_SYMBOL_GPL(zpci_disable_device);
 811
 812 int zpci_create_device(struct zpci_dev *zdev)
 813 {
 814         int rc;
 815
 816         rc = zpci_alloc_domain(zdev);
 817         if (rc)
 818                 goto out;
 819
 820         mutex_init(&zdev->lock);
 821         if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
 822                 rc = zpci_enable_device(zdev);
 823                 if (rc)
 824                         goto out_free;
 825         }
 826         rc = zpci_scan_bus(zdev);
 827         if (rc)
 828                 goto out_disable;
 829
 830         spin_lock(&zpci_list_lock);
 831         list_add_tail(&zdev->entry, &zpci_list);
 832         spin_unlock(&zpci_list_lock);
 833
 834         zpci_init_slot(zdev);
 835
 836         return 0;
 837
 838 out_disable:
 839         if (zdev->state == ZPCI_FN_STATE_ONLINE)
 840                 zpci_disable_device(zdev);
 841 out_free:
 842         zpci_free_domain(zdev);
 843 out:
 844         return rc;
 845 }
 846
 847 void zpci_stop_device(struct zpci_dev *zdev)
 848 {
 849         zpci_dma_exit_device(zdev);
 850         /*
 851          * Note: SCLP disables fh via set-pci-fn so don't
 852          * do that here.
 853          */
 854 }
 855 EXPORT_SYMBOL_GPL(zpci_stop_device);
 856
 857 static inline int barsize(u8 size)
 858 {
 859         return (size) ? (1 << size) >> 10 : 0;
 860 }
 861
 862 static int zpci_mem_init(void)
 863 {
 864         BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
 865                      __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
 866
 867         zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
 868                                            __alignof__(struct zpci_fmb), 0, NULL);
 869         if (!zdev_fmb_cache)
 870                 goto error_fmb;
 871
 872         zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
 873                                    sizeof(*zpci_iomap_start), GFP_KERNEL);
 874         if (!zpci_iomap_start)
 875                 goto error_iomap;
 876
 877         zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
 878                                     sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
 879         if (!zpci_iomap_bitmap)
 880                 goto error_iomap_bitmap;
 881
 882         return 0;
 883 error_iomap_bitmap:
 884         kfree(zpci_iomap_start);
 885 error_iomap:
 886         kmem_cache_destroy(zdev_fmb_cache);
 887 error_fmb:
 888         return -ENOMEM;
 889 }
 890
 891 static void zpci_mem_exit(void)
 892 {
 893         kfree(zpci_iomap_bitmap);
 894         kfree(zpci_iomap_start);
 895         kmem_cache_destroy(zdev_fmb_cache);
 896 }
 897
 898 static unsigned int s390_pci_probe = 1;
 899 static unsigned int s390_pci_initialized;
 900
 901 char * __init pcibios_setup(char *str)
 902 {
 903         if (!strcmp(str, "off")) {
 904                 s390_pci_probe = 0;
 905                 return NULL;
 906         }
 907         return str;
 908 }
 909
 910 bool zpci_is_enabled(void)
 911 {
 912         return s390_pci_initialized;
 913 }
 914
 915 static int __init pci_base_init(void)
 916 {
 917         int rc;
 918
 919         if (!s390_pci_probe)
 920                 return 0;
 921
 922         if (!test_facility(69) || !test_facility(71) || !test_facility(72))
 923                 return 0;
 924
 925         rc = zpci_debug_init();
 926         if (rc)
 927                 goto out;
 928
 929         rc = zpci_mem_init();
 930         if (rc)
 931                 goto out_mem;
 932
 933         rc = zpci_irq_init();
 934         if (rc)
 935                 goto out_irq;
 936
 937         rc = zpci_dma_init();
 938         if (rc)
 939                 goto out_dma;
 940
 941         rc = clp_scan_pci_devices();
 942         if (rc)
 943                 goto out_find;
 944
 945         s390_pci_initialized = 1;
 946         return 0;
 947
 948 out_find:
 949         zpci_dma_exit();
 950 out_dma:
 951         zpci_irq_exit();
 952 out_irq:
 953         zpci_mem_exit();
 954 out_mem:
 955         zpci_debug_exit();
 956 out:
 957         return rc;
 958 }
 959 subsys_initcall_sync(pci_base_init);
 960
 961 void zpci_rescan(void)
 962 {
 963         if (zpci_is_enabled())
 964                 clp_rescan_pci_devices_simple();
 965 }