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 #define ZPCI_IOMAP_ENTRIES                                              \
  64         min(((unsigned long) ZPCI_NR_DEVICES * PCI_BAR_COUNT / 2),      \
  65             ZPCI_IOMAP_MAX_ENTRIES)
  66
  67 static DEFINE_SPINLOCK(zpci_iomap_lock);
  68 static unsigned long *zpci_iomap_bitmap;
  69 struct zpci_iomap_entry *zpci_iomap_start;
  70 EXPORT_SYMBOL_GPL(zpci_iomap_start);
  71
  72 static struct kmem_cache *zdev_fmb_cache;
  73
  74 struct zpci_dev *get_zdev_by_fid(u32 fid)
  75 {
  76         struct zpci_dev *tmp, *zdev = NULL;
  77
  78         spin_lock(&zpci_list_lock);
  79         list_for_each_entry(tmp, &zpci_list, entry) {
  80                 if (tmp->fid == fid) {
  81                         zdev = tmp;
  82                         break;
  83                 }
  84         }
  85         spin_unlock(&zpci_list_lock);
  86         return zdev;
  87 }
  88
  89 void zpci_remove_reserved_devices(void)
  90 {
  91         struct zpci_dev *tmp, *zdev;
  92         enum zpci_state state;
  93         LIST_HEAD(remove);
  94
  95         spin_lock(&zpci_list_lock);
  96         list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
  97                 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
  98                     !clp_get_state(zdev->fid, &state) &&
  99                     state == ZPCI_FN_STATE_RESERVED)
 100                         list_move_tail(&zdev->entry, &remove);
 101         }
 102         spin_unlock(&zpci_list_lock);
 103
 104         list_for_each_entry_safe(zdev, tmp, &remove, entry)
 105                 zpci_remove_device(zdev);
 106 }
 107
 108 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
 109 {
 110         return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
 111 }
 112
 113 int pci_domain_nr(struct pci_bus *bus)
 114 {
 115         return ((struct zpci_dev *) bus->sysdata)->domain;
 116 }
 117 EXPORT_SYMBOL_GPL(pci_domain_nr);
 118
 119 int pci_proc_domain(struct pci_bus *bus)
 120 {
 121         return pci_domain_nr(bus);
 122 }
 123 EXPORT_SYMBOL_GPL(pci_proc_domain);
 124
 125 /* Modify PCI: Register adapter interruptions */
 126 static int zpci_set_airq(struct zpci_dev *zdev)
 127 {
 128         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
 129         struct zpci_fib fib = {0};
 130         u8 status;
 131
 132         fib.isc = PCI_ISC;
 133         fib.sum = 1;            /* enable summary notifications */
 134         fib.noi = airq_iv_end(zdev->aibv);
 135         fib.aibv = (unsigned long) zdev->aibv->vector;
 136         fib.aibvo = 0;          /* each zdev has its own interrupt vector */
 137         fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
 138         fib.aisbo = zdev->aisb & 63;
 139
 140         return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
 141 }
 142
 143 /* Modify PCI: Unregister adapter interruptions */
 144 static int zpci_clear_airq(struct zpci_dev *zdev)
 145 {
 146         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
 147         struct zpci_fib fib = {0};
 148         u8 cc, status;
 149
 150         cc = zpci_mod_fc(req, &fib, &status);
 151         if (cc == 3 || (cc == 1 && status == 24))
 152                 /* Function already gone or IRQs already deregistered. */
 153                 cc = 0;
 154
 155         return cc ? -EIO : 0;
 156 }
 157
 158 /* Modify PCI: Register I/O address translation parameters */
 159 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
 160                        u64 base, u64 limit, u64 iota)
 161 {
 162         u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
 163         struct zpci_fib fib = {0};
 164         u8 status;
 165
 166         WARN_ON_ONCE(iota & 0x3fff);
 167         fib.pba = base;
 168         fib.pal = limit;
 169         fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
 170         return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
 171 }
 172
 173 /* Modify PCI: Unregister I/O address translation parameters */
 174 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
 175 {
 176         u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
 177         struct zpci_fib fib = {0};
 178         u8 cc, status;
 179
 180         cc = zpci_mod_fc(req, &fib, &status);
 181         if (cc == 3) /* Function already gone. */
 182                 cc = 0;
 183         return cc ? -EIO : 0;
 184 }
 185
 186 /* Modify PCI: Set PCI function measurement parameters */
 187 int zpci_fmb_enable_device(struct zpci_dev *zdev)
 188 {
 189         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
 190         struct zpci_fib fib = {0};
 191         u8 cc, status;
 192
 193         if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
 194                 return -EINVAL;
 195
 196         zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
 197         if (!zdev->fmb)
 198                 return -ENOMEM;
 199         WARN_ON((u64) zdev->fmb & 0xf);
 200
 201         /* reset software counters */
 202         atomic64_set(&zdev->allocated_pages, 0);
 203         atomic64_set(&zdev->mapped_pages, 0);
 204         atomic64_set(&zdev->unmapped_pages, 0);
 205
 206         fib.fmb_addr = virt_to_phys(zdev->fmb);
 207         cc = zpci_mod_fc(req, &fib, &status);
 208         if (cc) {
 209                 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 210                 zdev->fmb = NULL;
 211         }
 212         return cc ? -EIO : 0;
 213 }
 214
 215 /* Modify PCI: Disable PCI function measurement */
 216 int zpci_fmb_disable_device(struct zpci_dev *zdev)
 217 {
 218         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
 219         struct zpci_fib fib = {0};
 220         u8 cc, status;
 221
 222         if (!zdev->fmb)
 223                 return -EINVAL;
 224
 225         /* Function measurement is disabled if fmb address is zero */
 226         cc = zpci_mod_fc(req, &fib, &status);
 227         if (cc == 3) /* Function already gone. */
 228                 cc = 0;
 229
 230         if (!cc) {
 231                 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 232                 zdev->fmb = NULL;
 233         }
 234         return cc ? -EIO : 0;
 235 }
 236
 237 static int zpci_cfg_load(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;
 241         int rc;
 242
 243         rc = zpci_load(&data, req, offset);
 244         if (!rc) {
 245                 data = le64_to_cpu((__force __le64) data);
 246                 data >>= (8 - len) * 8;
 247                 *val = (u32) data;
 248         } else
 249                 *val = 0xffffffff;
 250         return rc;
 251 }
 252
 253 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
 254 {
 255         u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 256         u64 data = val;
 257         int rc;
 258
 259         data <<= (8 - len) * 8;
 260         data = (__force u64) cpu_to_le64(data);
 261         rc = zpci_store(data, req, offset);
 262         return rc;
 263 }
 264
 265 void pcibios_fixup_bus(struct pci_bus *bus)
 266 {
 267 }
 268
 269 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 270                                        resource_size_t size,
 271                                        resource_size_t align)
 272 {
 273         return 0;
 274 }
 275
 276 /* combine single writes by using store-block insn */
 277 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
 278 {
 279        zpci_memcpy_toio(to, from, count);
 280 }
 281
 282 /* Create a virtual mapping cookie for a PCI BAR */
 283 void __iomem *pci_iomap_range(struct pci_dev *pdev,
 284                               int bar,
 285                               unsigned long offset,
 286                               unsigned long max)
 287 {
 288         struct zpci_dev *zdev = to_zpci(pdev);
 289         int idx;
 290
 291         if (!pci_resource_len(pdev, bar))
 292                 return NULL;
 293
 294         idx = zdev->bars[bar].map_idx;
 295         spin_lock(&zpci_iomap_lock);
 296         /* Detect overrun */
 297         WARN_ON(!++zpci_iomap_start[idx].count);
 298         zpci_iomap_start[idx].fh = zdev->fh;
 299         zpci_iomap_start[idx].bar = bar;
 300         spin_unlock(&zpci_iomap_lock);
 301
 302         return (void __iomem *) ZPCI_ADDR(idx) + offset;
 303 }
 304 EXPORT_SYMBOL(pci_iomap_range);
 305
 306 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 307 {
 308         return pci_iomap_range(dev, bar, 0, maxlen);
 309 }
 310 EXPORT_SYMBOL(pci_iomap);
 311
 312 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
 313 {
 314         unsigned int idx = ZPCI_IDX(addr);
 315
 316         spin_lock(&zpci_iomap_lock);
 317         /* Detect underrun */
 318         WARN_ON(!zpci_iomap_start[idx].count);
 319         if (!--zpci_iomap_start[idx].count) {
 320                 zpci_iomap_start[idx].fh = 0;
 321                 zpci_iomap_start[idx].bar = 0;
 322         }
 323         spin_unlock(&zpci_iomap_lock);
 324 }
 325 EXPORT_SYMBOL(pci_iounmap);
 326
 327 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 328                     int size, u32 *val)
 329 {
 330         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 331         int ret;
 332
 333         if (!zdev || devfn != ZPCI_DEVFN)
 334                 ret = -ENODEV;
 335         else
 336                 ret = zpci_cfg_load(zdev, where, val, size);
 337
 338         return ret;
 339 }
 340
 341 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 342                      int size, u32 val)
 343 {
 344         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 345         int ret;
 346
 347         if (!zdev || devfn != ZPCI_DEVFN)
 348                 ret = -ENODEV;
 349         else
 350                 ret = zpci_cfg_store(zdev, where, val, size);
 351
 352         return ret;
 353 }
 354
 355 static struct pci_ops pci_root_ops = {
 356         .read = pci_read,
 357         .write = pci_write,
 358 };
 359
 360 static void zpci_irq_handler(struct airq_struct *airq)
 361 {
 362         unsigned long si, ai;
 363         struct airq_iv *aibv;
 364         int irqs_on = 0;
 365
 366         inc_irq_stat(IRQIO_PCI);
 367         for (si = 0;;) {
 368                 /* Scan adapter summary indicator bit vector */
 369                 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
 370                 if (si == -1UL) {
 371                         if (irqs_on++)
 372                                 /* End of second scan with interrupts on. */
 373                                 break;
 374                         /* First scan complete, reenable interrupts. */
 375                         zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
 376                         si = 0;
 377                         continue;
 378                 }
 379
 380                 /* Scan the adapter interrupt vector for this device. */
 381                 aibv = zpci_aibv[si];
 382                 for (ai = 0;;) {
 383                         ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
 384                         if (ai == -1UL)
 385                                 break;
 386                         inc_irq_stat(IRQIO_MSI);
 387                         airq_iv_lock(aibv, ai);
 388                         generic_handle_irq(airq_iv_get_data(aibv, ai));
 389                         airq_iv_unlock(aibv, ai);
 390                 }
 391         }
 392 }
 393
 394 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 395 {
 396         struct zpci_dev *zdev = to_zpci(pdev);
 397         unsigned int hwirq, msi_vecs;
 398         unsigned long aisb;
 399         struct msi_desc *msi;
 400         struct msi_msg msg;
 401         int rc, irq;
 402
 403         zdev->aisb = -1UL;
 404         if (type == PCI_CAP_ID_MSI && nvec > 1)
 405                 return 1;
 406         msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
 407
 408         /* Allocate adapter summary indicator bit */
 409         aisb = airq_iv_alloc_bit(zpci_aisb_iv);
 410         if (aisb == -1UL)
 411                 return -EIO;
 412         zdev->aisb = aisb;
 413
 414         /* Create adapter interrupt vector */
 415         zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
 416         if (!zdev->aibv)
 417                 return -ENOMEM;
 418
 419         /* Wire up shortcut pointer */
 420         zpci_aibv[aisb] = zdev->aibv;
 421
 422         /* Request MSI interrupts */
 423         hwirq = 0;
 424         for_each_pci_msi_entry(msi, pdev) {
 425                 rc = -EIO;
 426                 irq = irq_alloc_desc(0);        /* Alloc irq on node 0 */
 427                 if (irq < 0)
 428                         return -ENOMEM;
 429                 rc = irq_set_msi_desc(irq, msi);
 430                 if (rc)
 431                         return rc;
 432                 irq_set_chip_and_handler(irq, &zpci_irq_chip,
 433                                          handle_simple_irq);
 434                 msg.data = hwirq;
 435                 msg.address_lo = zdev->msi_addr & 0xffffffff;
 436                 msg.address_hi = zdev->msi_addr >> 32;
 437                 pci_write_msi_msg(irq, &msg);
 438                 airq_iv_set_data(zdev->aibv, hwirq, irq);
 439                 hwirq++;
 440         }
 441
 442         /* Enable adapter interrupts */
 443         rc = zpci_set_airq(zdev);
 444         if (rc)
 445                 return rc;
 446
 447         return (msi_vecs == nvec) ? 0 : msi_vecs;
 448 }
 449
 450 void arch_teardown_msi_irqs(struct pci_dev *pdev)
 451 {
 452         struct zpci_dev *zdev = to_zpci(pdev);
 453         struct msi_desc *msi;
 454         int rc;
 455
 456         /* Disable adapter interrupts */
 457         rc = zpci_clear_airq(zdev);
 458         if (rc)
 459                 return;
 460
 461         /* Release MSI interrupts */
 462         for_each_pci_msi_entry(msi, pdev) {
 463                 if (!msi->irq)
 464                         continue;
 465                 if (msi->msi_attrib.is_msix)
 466                         __pci_msix_desc_mask_irq(msi, 1);
 467                 else
 468                         __pci_msi_desc_mask_irq(msi, 1, 1);
 469                 irq_set_msi_desc(msi->irq, NULL);
 470                 irq_free_desc(msi->irq);
 471                 msi->msg.address_lo = 0;
 472                 msi->msg.address_hi = 0;
 473                 msi->msg.data = 0;
 474                 msi->irq = 0;
 475         }
 476
 477         if (zdev->aisb != -1UL) {
 478                 zpci_aibv[zdev->aisb] = NULL;
 479                 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
 480                 zdev->aisb = -1UL;
 481         }
 482         if (zdev->aibv) {
 483                 airq_iv_release(zdev->aibv);
 484                 zdev->aibv = NULL;
 485         }
 486 }
 487
 488 static void zpci_map_resources(struct pci_dev *pdev)
 489 {
 490         resource_size_t len;
 491         int i;
 492
 493         for (i = 0; i < PCI_BAR_COUNT; i++) {
 494                 len = pci_resource_len(pdev, i);
 495                 if (!len)
 496                         continue;
 497                 pdev->resource[i].start =
 498                         (resource_size_t __force) pci_iomap(pdev, i, 0);
 499                 pdev->resource[i].end = pdev->resource[i].start + len - 1;
 500         }
 501 }
 502
 503 static void zpci_unmap_resources(struct pci_dev *pdev)
 504 {
 505         resource_size_t len;
 506         int i;
 507
 508         for (i = 0; i < PCI_BAR_COUNT; i++) {
 509                 len = pci_resource_len(pdev, i);
 510                 if (!len)
 511                         continue;
 512                 pci_iounmap(pdev, (void __iomem __force *)
 513                             pdev->resource[i].start);
 514         }
 515 }
 516
 517 static struct airq_struct zpci_airq = {
 518         .handler = zpci_irq_handler,
 519         .isc = PCI_ISC,
 520 };
 521
 522 static int __init zpci_irq_init(void)
 523 {
 524         int rc;
 525
 526         rc = register_adapter_interrupt(&zpci_airq);
 527         if (rc)
 528                 goto out;
 529         /* Set summary to 1 to be called every time for the ISC. */
 530         *zpci_airq.lsi_ptr = 1;
 531
 532         rc = -ENOMEM;
 533         zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
 534         if (!zpci_aisb_iv)
 535                 goto out_airq;
 536
 537         zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
 538         return 0;
 539
 540 out_airq:
 541         unregister_adapter_interrupt(&zpci_airq);
 542 out:
 543         return rc;
 544 }
 545
 546 static void zpci_irq_exit(void)
 547 {
 548         airq_iv_release(zpci_aisb_iv);
 549         unregister_adapter_interrupt(&zpci_airq);
 550 }
 551
 552 static int zpci_alloc_iomap(struct zpci_dev *zdev)
 553 {
 554         unsigned long entry;
 555
 556         spin_lock(&zpci_iomap_lock);
 557         entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
 558         if (entry == ZPCI_IOMAP_ENTRIES) {
 559                 spin_unlock(&zpci_iomap_lock);
 560                 return -ENOSPC;
 561         }
 562         set_bit(entry, zpci_iomap_bitmap);
 563         spin_unlock(&zpci_iomap_lock);
 564         return entry;
 565 }
 566
 567 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
 568 {
 569         spin_lock(&zpci_iomap_lock);
 570         memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
 571         clear_bit(entry, zpci_iomap_bitmap);
 572         spin_unlock(&zpci_iomap_lock);
 573 }
 574
 575 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
 576                                     unsigned long size, unsigned long flags)
 577 {
 578         struct resource *r;
 579
 580         r = kzalloc(sizeof(*r), GFP_KERNEL);
 581         if (!r)
 582                 return NULL;
 583
 584         r->start = start;
 585         r->end = r->start + size - 1;
 586         r->flags = flags;
 587         r->name = zdev->res_name;
 588
 589         if (request_resource(&iomem_resource, r)) {
 590                 kfree(r);
 591                 return NULL;
 592         }
 593         return r;
 594 }
 595
 596 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
 597                                     struct list_head *resources)
 598 {
 599         unsigned long addr, size, flags;
 600         struct resource *res;
 601         int i, entry;
 602
 603         snprintf(zdev->res_name, sizeof(zdev->res_name),
 604                  "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
 605
 606         for (i = 0; i < PCI_BAR_COUNT; i++) {
 607                 if (!zdev->bars[i].size)
 608                         continue;
 609                 entry = zpci_alloc_iomap(zdev);
 610                 if (entry < 0)
 611                         return entry;
 612                 zdev->bars[i].map_idx = entry;
 613
 614                 /* only MMIO is supported */
 615                 flags = IORESOURCE_MEM;
 616                 if (zdev->bars[i].val & 8)
 617                         flags |= IORESOURCE_PREFETCH;
 618                 if (zdev->bars[i].val & 4)
 619                         flags |= IORESOURCE_MEM_64;
 620
 621                 addr = ZPCI_ADDR(entry);
 622                 size = 1UL << zdev->bars[i].size;
 623
 624                 res = __alloc_res(zdev, addr, size, flags);
 625                 if (!res) {
 626                         zpci_free_iomap(zdev, entry);
 627                         return -ENOMEM;
 628                 }
 629                 zdev->bars[i].res = res;
 630                 pci_add_resource(resources, res);
 631         }
 632
 633         return 0;
 634 }
 635
 636 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
 637 {
 638         int i;
 639
 640         for (i = 0; i < PCI_BAR_COUNT; i++) {
 641                 if (!zdev->bars[i].size || !zdev->bars[i].res)
 642                         continue;
 643
 644                 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
 645                 release_resource(zdev->bars[i].res);
 646                 kfree(zdev->bars[i].res);
 647         }
 648 }
 649
 650 int pcibios_add_device(struct pci_dev *pdev)
 651 {
 652         struct resource *res;
 653         int i;
 654
 655         pdev->dev.groups = zpci_attr_groups;
 656         pdev->dev.dma_ops = &s390_pci_dma_ops;
 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 = to_zpci(pdev);
 677
 678         zpci_debug_init_device(zdev, dev_name(&pdev->dev));
 679         zpci_fmb_enable_device(zdev);
 680
 681         return pci_enable_resources(pdev, mask);
 682 }
 683
 684 void pcibios_disable_device(struct pci_dev *pdev)
 685 {
 686         struct zpci_dev *zdev = to_zpci(pdev);
 687
 688         zpci_fmb_disable_device(zdev);
 689         zpci_debug_exit_device(zdev);
 690 }
 691
 692 #ifdef CONFIG_HIBERNATE_CALLBACKS
 693 static int zpci_restore(struct device *dev)
 694 {
 695         struct pci_dev *pdev = to_pci_dev(dev);
 696         struct zpci_dev *zdev = to_zpci(pdev);
 697         int ret = 0;
 698
 699         if (zdev->state != ZPCI_FN_STATE_ONLINE)
 700                 goto out;
 701
 702         ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 703         if (ret)
 704                 goto out;
 705
 706         zpci_map_resources(pdev);
 707         zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
 708                            (u64) zdev->dma_table);
 709
 710 out:
 711         return ret;
 712 }
 713
 714 static int zpci_freeze(struct device *dev)
 715 {
 716         struct pci_dev *pdev = to_pci_dev(dev);
 717         struct zpci_dev *zdev = to_zpci(pdev);
 718
 719         if (zdev->state != ZPCI_FN_STATE_ONLINE)
 720                 return 0;
 721
 722         zpci_unregister_ioat(zdev, 0);
 723         zpci_unmap_resources(pdev);
 724         return clp_disable_fh(zdev);
 725 }
 726
 727 struct dev_pm_ops pcibios_pm_ops = {
 728         .thaw_noirq = zpci_restore,
 729         .freeze_noirq = zpci_freeze,
 730         .restore_noirq = zpci_restore,
 731         .poweroff_noirq = zpci_freeze,
 732 };
 733 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 734
 735 static int zpci_alloc_domain(struct zpci_dev *zdev)
 736 {
 737         if (zpci_unique_uid) {
 738                 zdev->domain = (u16) zdev->uid;
 739                 if (zdev->domain >= ZPCI_NR_DEVICES)
 740                         return 0;
 741
 742                 spin_lock(&zpci_domain_lock);
 743                 if (test_bit(zdev->domain, zpci_domain)) {
 744                         spin_unlock(&zpci_domain_lock);
 745                         return -EEXIST;
 746                 }
 747                 set_bit(zdev->domain, zpci_domain);
 748                 spin_unlock(&zpci_domain_lock);
 749                 return 0;
 750         }
 751
 752         spin_lock(&zpci_domain_lock);
 753         zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
 754         if (zdev->domain == ZPCI_NR_DEVICES) {
 755                 spin_unlock(&zpci_domain_lock);
 756                 return -ENOSPC;
 757         }
 758         set_bit(zdev->domain, zpci_domain);
 759         spin_unlock(&zpci_domain_lock);
 760         return 0;
 761 }
 762
 763 static void zpci_free_domain(struct zpci_dev *zdev)
 764 {
 765         if (zdev->domain >= ZPCI_NR_DEVICES)
 766                 return;
 767
 768         spin_lock(&zpci_domain_lock);
 769         clear_bit(zdev->domain, zpci_domain);
 770         spin_unlock(&zpci_domain_lock);
 771 }
 772
 773 void pcibios_remove_bus(struct pci_bus *bus)
 774 {
 775         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 776
 777         zpci_exit_slot(zdev);
 778         zpci_cleanup_bus_resources(zdev);
 779         zpci_free_domain(zdev);
 780
 781         spin_lock(&zpci_list_lock);
 782         list_del(&zdev->entry);
 783         spin_unlock(&zpci_list_lock);
 784
 785         zpci_dbg(3, "rem fid:%x\n", zdev->fid);
 786         kfree(zdev);
 787 }
 788
 789 static int zpci_scan_bus(struct zpci_dev *zdev)
 790 {
 791         LIST_HEAD(resources);
 792         int ret;
 793
 794         ret = zpci_setup_bus_resources(zdev, &resources);
 795         if (ret)
 796                 goto error;
 797
 798         zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
 799                                       zdev, &resources);
 800         if (!zdev->bus) {
 801                 ret = -EIO;
 802                 goto error;
 803         }
 804         zdev->bus->max_bus_speed = zdev->max_bus_speed;
 805         pci_bus_add_devices(zdev->bus);
 806         return 0;
 807
 808 error:
 809         zpci_cleanup_bus_resources(zdev);
 810         pci_free_resource_list(&resources);
 811         return ret;
 812 }
 813
 814 int zpci_enable_device(struct zpci_dev *zdev)
 815 {
 816         int rc;
 817
 818         rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 819         if (rc)
 820                 goto out;
 821
 822         rc = zpci_dma_init_device(zdev);
 823         if (rc)
 824                 goto out_dma;
 825
 826         zdev->state = ZPCI_FN_STATE_ONLINE;
 827         return 0;
 828
 829 out_dma:
 830         clp_disable_fh(zdev);
 831 out:
 832         return rc;
 833 }
 834 EXPORT_SYMBOL_GPL(zpci_enable_device);
 835
 836 int zpci_disable_device(struct zpci_dev *zdev)
 837 {
 838         zpci_dma_exit_device(zdev);
 839         return clp_disable_fh(zdev);
 840 }
 841 EXPORT_SYMBOL_GPL(zpci_disable_device);
 842
 843 int zpci_create_device(struct zpci_dev *zdev)
 844 {
 845         int rc;
 846
 847         rc = zpci_alloc_domain(zdev);
 848         if (rc)
 849                 goto out;
 850
 851         mutex_init(&zdev->lock);
 852         if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
 853                 rc = zpci_enable_device(zdev);
 854                 if (rc)
 855                         goto out_free;
 856         }
 857         rc = zpci_scan_bus(zdev);
 858         if (rc)
 859                 goto out_disable;
 860
 861         spin_lock(&zpci_list_lock);
 862         list_add_tail(&zdev->entry, &zpci_list);
 863         spin_unlock(&zpci_list_lock);
 864
 865         zpci_init_slot(zdev);
 866
 867         return 0;
 868
 869 out_disable:
 870         if (zdev->state == ZPCI_FN_STATE_ONLINE)
 871                 zpci_disable_device(zdev);
 872 out_free:
 873         zpci_free_domain(zdev);
 874 out:
 875         return rc;
 876 }
 877
 878 void zpci_remove_device(struct zpci_dev *zdev)
 879 {
 880         if (!zdev->bus)
 881                 return;
 882
 883         pci_stop_root_bus(zdev->bus);
 884         pci_remove_root_bus(zdev->bus);
 885 }
 886
 887 int zpci_report_error(struct pci_dev *pdev,
 888                       struct zpci_report_error_header *report)
 889 {
 890         struct zpci_dev *zdev = to_zpci(pdev);
 891
 892         return sclp_pci_report(report, zdev->fh, zdev->fid);
 893 }
 894 EXPORT_SYMBOL(zpci_report_error);
 895
 896 static int zpci_mem_init(void)
 897 {
 898         BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
 899                      __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
 900
 901         zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
 902                                            __alignof__(struct zpci_fmb), 0, NULL);
 903         if (!zdev_fmb_cache)
 904                 goto error_fmb;
 905
 906         zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
 907                                    sizeof(*zpci_iomap_start), GFP_KERNEL);
 908         if (!zpci_iomap_start)
 909                 goto error_iomap;
 910
 911         zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
 912                                     sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
 913         if (!zpci_iomap_bitmap)
 914                 goto error_iomap_bitmap;
 915
 916         return 0;
 917 error_iomap_bitmap:
 918         kfree(zpci_iomap_start);
 919 error_iomap:
 920         kmem_cache_destroy(zdev_fmb_cache);
 921 error_fmb:
 922         return -ENOMEM;
 923 }
 924
 925 static void zpci_mem_exit(void)
 926 {
 927         kfree(zpci_iomap_bitmap);
 928         kfree(zpci_iomap_start);
 929         kmem_cache_destroy(zdev_fmb_cache);
 930 }
 931
 932 static unsigned int s390_pci_probe = 1;
 933 static unsigned int s390_pci_initialized;
 934
 935 char * __init pcibios_setup(char *str)
 936 {
 937         if (!strcmp(str, "off")) {
 938                 s390_pci_probe = 0;
 939                 return NULL;
 940         }
 941         return str;
 942 }
 943
 944 bool zpci_is_enabled(void)
 945 {
 946         return s390_pci_initialized;
 947 }
 948
 949 static int __init pci_base_init(void)
 950 {
 951         int rc;
 952
 953         if (!s390_pci_probe)
 954                 return 0;
 955
 956         if (!test_facility(69) || !test_facility(71) || !test_facility(72))
 957                 return 0;
 958
 959         rc = zpci_debug_init();
 960         if (rc)
 961                 goto out;
 962
 963         rc = zpci_mem_init();
 964         if (rc)
 965                 goto out_mem;
 966
 967         rc = zpci_irq_init();
 968         if (rc)
 969                 goto out_irq;
 970
 971         rc = zpci_dma_init();
 972         if (rc)
 973                 goto out_dma;
 974
 975         rc = clp_scan_pci_devices();
 976         if (rc)
 977                 goto out_find;
 978
 979         s390_pci_initialized = 1;
 980         return 0;
 981
 982 out_find:
 983         zpci_dma_exit();
 984 out_dma:
 985         zpci_irq_exit();
 986 out_irq:
 987         zpci_mem_exit();
 988 out_mem:
 989         zpci_debug_exit();
 990 out:
 991         return rc;
 992 }
 993 subsys_initcall_sync(pci_base_init);
 994
 995 void zpci_rescan(void)
 996 {
 997         if (zpci_is_enabled())
 998                 clp_rescan_pci_devices_simple();
 999 }