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