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