arch/s390/pci/pci.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2012
   4  *
   5  * Author(s):
   6  *   Jan Glauber <jang@linux.vnet.ibm.com>
   7  *
   8  * The System z PCI code is a rewrite from a prototype by
   9  * the following people (Kudoz!):
  10  *   Alexander Schmidt
  11  *   Christoph Raisch
  12  *   Hannes Hering
  13  *   Hoang-Nam Nguyen
  14  *   Jan-Bernd Themann
  15  *   Stefan Roscher
  16  *   Thomas Klein
  17  */
  18
  19 #define KMSG_COMPONENT "zpci"
  20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  21
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24 #include <linux/err.h>
  25 #include <linux/export.h>
  26 #include <linux/delay.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/jump_label.h>
  29 #include <linux/pci.h>
  30 #include <linux/printk.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 /* list of all detected zpci devices */
  40 static LIST_HEAD(zpci_list);
  41 static DEFINE_SPINLOCK(zpci_list_lock);
  42
  43 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
  44 static DEFINE_SPINLOCK(zpci_domain_lock);
  45
  46 #define ZPCI_IOMAP_ENTRIES                                              \
  47         min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2),   \
  48             ZPCI_IOMAP_MAX_ENTRIES)
  49
  50 static DEFINE_SPINLOCK(zpci_iomap_lock);
  51 static unsigned long *zpci_iomap_bitmap;
  52 struct zpci_iomap_entry *zpci_iomap_start;
  53 EXPORT_SYMBOL_GPL(zpci_iomap_start);
  54
  55 DEFINE_STATIC_KEY_FALSE(have_mio);
  56
  57 static struct kmem_cache *zdev_fmb_cache;
  58
  59 struct zpci_dev *get_zdev_by_fid(u32 fid)
  60 {
  61         struct zpci_dev *tmp, *zdev = NULL;
  62
  63         spin_lock(&zpci_list_lock);
  64         list_for_each_entry(tmp, &zpci_list, entry) {
  65                 if (tmp->fid == fid) {
  66                         zdev = tmp;
  67                         break;
  68                 }
  69         }
  70         spin_unlock(&zpci_list_lock);
  71         return zdev;
  72 }
  73
  74 void zpci_remove_reserved_devices(void)
  75 {
  76         struct zpci_dev *tmp, *zdev;
  77         enum zpci_state state;
  78         LIST_HEAD(remove);
  79
  80         spin_lock(&zpci_list_lock);
  81         list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
  82                 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
  83                     !clp_get_state(zdev->fid, &state) &&
  84                     state == ZPCI_FN_STATE_RESERVED)
  85                         list_move_tail(&zdev->entry, &remove);
  86         }
  87         spin_unlock(&zpci_list_lock);
  88
  89         list_for_each_entry_safe(zdev, tmp, &remove, entry)
  90                 zpci_remove_device(zdev);
  91 }
  92
  93 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
  94 {
  95         return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
  96 }
  97
  98 int pci_domain_nr(struct pci_bus *bus)
  99 {
 100         return ((struct zpci_dev *) bus->sysdata)->domain;
 101 }
 102 EXPORT_SYMBOL_GPL(pci_domain_nr);
 103
 104 int pci_proc_domain(struct pci_bus *bus)
 105 {
 106         return pci_domain_nr(bus);
 107 }
 108 EXPORT_SYMBOL_GPL(pci_proc_domain);
 109
 110 /* Modify PCI: Register I/O address translation parameters */
 111 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
 112                        u64 base, u64 limit, u64 iota)
 113 {
 114         u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
 115         struct zpci_fib fib = {0};
 116         u8 status;
 117
 118         WARN_ON_ONCE(iota & 0x3fff);
 119         fib.pba = base;
 120         fib.pal = limit;
 121         fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
 122         return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
 123 }
 124
 125 /* Modify PCI: Unregister I/O address translation parameters */
 126 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
 127 {
 128         u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
 129         struct zpci_fib fib = {0};
 130         u8 cc, status;
 131
 132         cc = zpci_mod_fc(req, &fib, &status);
 133         if (cc == 3) /* Function already gone. */
 134                 cc = 0;
 135         return cc ? -EIO : 0;
 136 }
 137
 138 /* Modify PCI: Set PCI function measurement parameters */
 139 int zpci_fmb_enable_device(struct zpci_dev *zdev)
 140 {
 141         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
 142         struct zpci_fib fib = {0};
 143         u8 cc, status;
 144
 145         if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
 146                 return -EINVAL;
 147
 148         zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
 149         if (!zdev->fmb)
 150                 return -ENOMEM;
 151         WARN_ON((u64) zdev->fmb & 0xf);
 152
 153         /* reset software counters */
 154         atomic64_set(&zdev->allocated_pages, 0);
 155         atomic64_set(&zdev->mapped_pages, 0);
 156         atomic64_set(&zdev->unmapped_pages, 0);
 157
 158         fib.fmb_addr = virt_to_phys(zdev->fmb);
 159         cc = zpci_mod_fc(req, &fib, &status);
 160         if (cc) {
 161                 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 162                 zdev->fmb = NULL;
 163         }
 164         return cc ? -EIO : 0;
 165 }
 166
 167 /* Modify PCI: Disable PCI function measurement */
 168 int zpci_fmb_disable_device(struct zpci_dev *zdev)
 169 {
 170         u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
 171         struct zpci_fib fib = {0};
 172         u8 cc, status;
 173
 174         if (!zdev->fmb)
 175                 return -EINVAL;
 176
 177         /* Function measurement is disabled if fmb address is zero */
 178         cc = zpci_mod_fc(req, &fib, &status);
 179         if (cc == 3) /* Function already gone. */
 180                 cc = 0;
 181
 182         if (!cc) {
 183                 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
 184                 zdev->fmb = NULL;
 185         }
 186         return cc ? -EIO : 0;
 187 }
 188
 189 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
 190 {
 191         u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 192         u64 data;
 193         int rc;
 194
 195         rc = __zpci_load(&data, req, offset);
 196         if (!rc) {
 197                 data = le64_to_cpu((__force __le64) data);
 198                 data >>= (8 - len) * 8;
 199                 *val = (u32) data;
 200         } else
 201                 *val = 0xffffffff;
 202         return rc;
 203 }
 204
 205 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
 206 {
 207         u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
 208         u64 data = val;
 209         int rc;
 210
 211         data <<= (8 - len) * 8;
 212         data = (__force u64) cpu_to_le64(data);
 213         rc = __zpci_store(data, req, offset);
 214         return rc;
 215 }
 216
 217 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 218                                        resource_size_t size,
 219                                        resource_size_t align)
 220 {
 221         return 0;
 222 }
 223
 224 /* combine single writes by using store-block insn */
 225 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
 226 {
 227        zpci_memcpy_toio(to, from, count);
 228 }
 229
 230 void __iomem *ioremap(unsigned long ioaddr, unsigned long size)
 231 {
 232         struct vm_struct *area;
 233         unsigned long offset;
 234
 235         if (!size)
 236                 return NULL;
 237
 238         if (!static_branch_unlikely(&have_mio))
 239                 return (void __iomem *) ioaddr;
 240
 241         offset = ioaddr & ~PAGE_MASK;
 242         ioaddr &= PAGE_MASK;
 243         size = PAGE_ALIGN(size + offset);
 244         area = get_vm_area(size, VM_IOREMAP);
 245         if (!area)
 246                 return NULL;
 247
 248         if (ioremap_page_range((unsigned long) area->addr,
 249                                (unsigned long) area->addr + size,
 250                                ioaddr, PAGE_KERNEL)) {
 251                 vunmap(area->addr);
 252                 return NULL;
 253         }
 254         return (void __iomem *) ((unsigned long) area->addr + offset);
 255 }
 256 EXPORT_SYMBOL(ioremap);
 257
 258 void iounmap(volatile void __iomem *addr)
 259 {
 260         if (static_branch_likely(&have_mio))
 261                 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
 262 }
 263 EXPORT_SYMBOL(iounmap);
 264
 265 /* Create a virtual mapping cookie for a PCI BAR */
 266 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
 267                                         unsigned long offset, unsigned long max)
 268 {
 269         struct zpci_dev *zdev = to_zpci(pdev);
 270         int idx;
 271
 272         idx = zdev->bars[bar].map_idx;
 273         spin_lock(&zpci_iomap_lock);
 274         /* Detect overrun */
 275         WARN_ON(!++zpci_iomap_start[idx].count);
 276         zpci_iomap_start[idx].fh = zdev->fh;
 277         zpci_iomap_start[idx].bar = bar;
 278         spin_unlock(&zpci_iomap_lock);
 279
 280         return (void __iomem *) ZPCI_ADDR(idx) + offset;
 281 }
 282
 283 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
 284                                          unsigned long offset,
 285                                          unsigned long max)
 286 {
 287         unsigned long barsize = pci_resource_len(pdev, bar);
 288         struct zpci_dev *zdev = to_zpci(pdev);
 289         void __iomem *iova;
 290
 291         iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
 292         return iova ? iova + offset : iova;
 293 }
 294
 295 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
 296                               unsigned long offset, unsigned long max)
 297 {
 298         if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
 299                 return NULL;
 300
 301         if (static_branch_likely(&have_mio))
 302                 return pci_iomap_range_mio(pdev, bar, offset, max);
 303         else
 304                 return pci_iomap_range_fh(pdev, bar, offset, max);
 305 }
 306 EXPORT_SYMBOL(pci_iomap_range);
 307
 308 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 309 {
 310         return pci_iomap_range(dev, bar, 0, maxlen);
 311 }
 312 EXPORT_SYMBOL(pci_iomap);
 313
 314 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
 315                                             unsigned long offset, unsigned long max)
 316 {
 317         unsigned long barsize = pci_resource_len(pdev, bar);
 318         struct zpci_dev *zdev = to_zpci(pdev);
 319         void __iomem *iova;
 320
 321         iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
 322         return iova ? iova + offset : iova;
 323 }
 324
 325 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
 326                                  unsigned long offset, unsigned long max)
 327 {
 328         if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
 329                 return NULL;
 330
 331         if (static_branch_likely(&have_mio))
 332                 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
 333         else
 334                 return pci_iomap_range_fh(pdev, bar, offset, max);
 335 }
 336 EXPORT_SYMBOL(pci_iomap_wc_range);
 337
 338 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
 339 {
 340         return pci_iomap_wc_range(dev, bar, 0, maxlen);
 341 }
 342 EXPORT_SYMBOL(pci_iomap_wc);
 343
 344 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
 345 {
 346         unsigned int idx = ZPCI_IDX(addr);
 347
 348         spin_lock(&zpci_iomap_lock);
 349         /* Detect underrun */
 350         WARN_ON(!zpci_iomap_start[idx].count);
 351         if (!--zpci_iomap_start[idx].count) {
 352                 zpci_iomap_start[idx].fh = 0;
 353                 zpci_iomap_start[idx].bar = 0;
 354         }
 355         spin_unlock(&zpci_iomap_lock);
 356 }
 357
 358 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
 359 {
 360         iounmap(addr);
 361 }
 362
 363 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
 364 {
 365         if (static_branch_likely(&have_mio))
 366                 pci_iounmap_mio(pdev, addr);
 367         else
 368                 pci_iounmap_fh(pdev, addr);
 369 }
 370 EXPORT_SYMBOL(pci_iounmap);
 371
 372 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 373                     int size, u32 *val)
 374 {
 375         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 376         int ret;
 377
 378         if (!zdev || devfn != ZPCI_DEVFN)
 379                 ret = -ENODEV;
 380         else
 381                 ret = zpci_cfg_load(zdev, where, val, size);
 382
 383         return ret;
 384 }
 385
 386 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 387                      int size, u32 val)
 388 {
 389         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 390         int ret;
 391
 392         if (!zdev || devfn != ZPCI_DEVFN)
 393                 ret = -ENODEV;
 394         else
 395                 ret = zpci_cfg_store(zdev, where, val, size);
 396
 397         return ret;
 398 }
 399
 400 static struct pci_ops pci_root_ops = {
 401         .read = pci_read,
 402         .write = pci_write,
 403 };
 404
 405 #ifdef CONFIG_PCI_IOV
 406 static struct resource iov_res = {
 407         .name   = "PCI IOV res",
 408         .start  = 0,
 409         .end    = -1,
 410         .flags  = IORESOURCE_MEM,
 411 };
 412 #endif
 413
 414 static void zpci_map_resources(struct pci_dev *pdev)
 415 {
 416         struct zpci_dev *zdev = to_zpci(pdev);
 417         resource_size_t len;
 418         int i;
 419
 420         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 421                 len = pci_resource_len(pdev, i);
 422                 if (!len)
 423                         continue;
 424
 425                 if (zpci_use_mio(zdev))
 426                         pdev->resource[i].start =
 427                                 (resource_size_t __force) zdev->bars[i].mio_wb;
 428                 else
 429                         pdev->resource[i].start = (resource_size_t __force)
 430                                 pci_iomap_range_fh(pdev, i, 0, 0);
 431                 pdev->resource[i].end = pdev->resource[i].start + len - 1;
 432         }
 433
 434 #ifdef CONFIG_PCI_IOV
 435         for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
 436                 int bar = i + PCI_IOV_RESOURCES;
 437
 438                 len = pci_resource_len(pdev, bar);
 439                 if (!len)
 440                         continue;
 441                 pdev->resource[bar].parent = &iov_res;
 442         }
 443 #endif
 444 }
 445
 446 static void zpci_unmap_resources(struct pci_dev *pdev)
 447 {
 448         struct zpci_dev *zdev = to_zpci(pdev);
 449         resource_size_t len;
 450         int i;
 451
 452         if (zpci_use_mio(zdev))
 453                 return;
 454
 455         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 456                 len = pci_resource_len(pdev, i);
 457                 if (!len)
 458                         continue;
 459                 pci_iounmap_fh(pdev, (void __iomem __force *)
 460                                pdev->resource[i].start);
 461         }
 462 }
 463
 464 static int zpci_alloc_iomap(struct zpci_dev *zdev)
 465 {
 466         unsigned long entry;
 467
 468         spin_lock(&zpci_iomap_lock);
 469         entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
 470         if (entry == ZPCI_IOMAP_ENTRIES) {
 471                 spin_unlock(&zpci_iomap_lock);
 472                 return -ENOSPC;
 473         }
 474         set_bit(entry, zpci_iomap_bitmap);
 475         spin_unlock(&zpci_iomap_lock);
 476         return entry;
 477 }
 478
 479 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
 480 {
 481         spin_lock(&zpci_iomap_lock);
 482         memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
 483         clear_bit(entry, zpci_iomap_bitmap);
 484         spin_unlock(&zpci_iomap_lock);
 485 }
 486
 487 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
 488                                     unsigned long size, unsigned long flags)
 489 {
 490         struct resource *r;
 491
 492         r = kzalloc(sizeof(*r), GFP_KERNEL);
 493         if (!r)
 494                 return NULL;
 495
 496         r->start = start;
 497         r->end = r->start + size - 1;
 498         r->flags = flags;
 499         r->name = zdev->res_name;
 500
 501         if (request_resource(&iomem_resource, r)) {
 502                 kfree(r);
 503                 return NULL;
 504         }
 505         return r;
 506 }
 507
 508 static int zpci_setup_bus_resources(struct zpci_dev *zdev,
 509                                     struct list_head *resources)
 510 {
 511         unsigned long addr, size, flags;
 512         struct resource *res;
 513         int i, entry;
 514
 515         snprintf(zdev->res_name, sizeof(zdev->res_name),
 516                  "PCI Bus %04x:%02x", zdev->domain, ZPCI_BUS_NR);
 517
 518         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 519                 if (!zdev->bars[i].size)
 520                         continue;
 521                 entry = zpci_alloc_iomap(zdev);
 522                 if (entry < 0)
 523                         return entry;
 524                 zdev->bars[i].map_idx = entry;
 525
 526                 /* only MMIO is supported */
 527                 flags = IORESOURCE_MEM;
 528                 if (zdev->bars[i].val & 8)
 529                         flags |= IORESOURCE_PREFETCH;
 530                 if (zdev->bars[i].val & 4)
 531                         flags |= IORESOURCE_MEM_64;
 532
 533                 if (zpci_use_mio(zdev))
 534                         addr = (unsigned long) zdev->bars[i].mio_wb;
 535                 else
 536                         addr = ZPCI_ADDR(entry);
 537                 size = 1UL << zdev->bars[i].size;
 538
 539                 res = __alloc_res(zdev, addr, size, flags);
 540                 if (!res) {
 541                         zpci_free_iomap(zdev, entry);
 542                         return -ENOMEM;
 543                 }
 544                 zdev->bars[i].res = res;
 545                 pci_add_resource(resources, res);
 546         }
 547
 548         return 0;
 549 }
 550
 551 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
 552 {
 553         int i;
 554
 555         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 556                 if (!zdev->bars[i].size || !zdev->bars[i].res)
 557                         continue;
 558
 559                 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
 560                 release_resource(zdev->bars[i].res);
 561                 kfree(zdev->bars[i].res);
 562         }
 563 }
 564
 565 int pcibios_add_device(struct pci_dev *pdev)
 566 {
 567         struct resource *res;
 568         int i;
 569
 570         if (pdev->is_physfn)
 571                 pdev->no_vf_scan = 1;
 572
 573         pdev->dev.groups = zpci_attr_groups;
 574         pdev->dev.dma_ops = &s390_pci_dma_ops;
 575         zpci_map_resources(pdev);
 576
 577         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 578                 res = &pdev->resource[i];
 579                 if (res->parent || !res->flags)
 580                         continue;
 581                 pci_claim_resource(pdev, i);
 582         }
 583
 584         return 0;
 585 }
 586
 587 void pcibios_release_device(struct pci_dev *pdev)
 588 {
 589         zpci_unmap_resources(pdev);
 590 }
 591
 592 int pcibios_enable_device(struct pci_dev *pdev, int mask)
 593 {
 594         struct zpci_dev *zdev = to_zpci(pdev);
 595
 596         zpci_debug_init_device(zdev, dev_name(&pdev->dev));
 597         zpci_fmb_enable_device(zdev);
 598
 599         return pci_enable_resources(pdev, mask);
 600 }
 601
 602 void pcibios_disable_device(struct pci_dev *pdev)
 603 {
 604         struct zpci_dev *zdev = to_zpci(pdev);
 605
 606         zpci_fmb_disable_device(zdev);
 607         zpci_debug_exit_device(zdev);
 608 }
 609
 610 #ifdef CONFIG_HIBERNATE_CALLBACKS
 611 static int zpci_restore(struct device *dev)
 612 {
 613         struct pci_dev *pdev = to_pci_dev(dev);
 614         struct zpci_dev *zdev = to_zpci(pdev);
 615         int ret = 0;
 616
 617         if (zdev->state != ZPCI_FN_STATE_ONLINE)
 618                 goto out;
 619
 620         ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 621         if (ret)
 622                 goto out;
 623
 624         zpci_map_resources(pdev);
 625         zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
 626                            (u64) zdev->dma_table);
 627
 628 out:
 629         return ret;
 630 }
 631
 632 static int zpci_freeze(struct device *dev)
 633 {
 634         struct pci_dev *pdev = to_pci_dev(dev);
 635         struct zpci_dev *zdev = to_zpci(pdev);
 636
 637         if (zdev->state != ZPCI_FN_STATE_ONLINE)
 638                 return 0;
 639
 640         zpci_unregister_ioat(zdev, 0);
 641         zpci_unmap_resources(pdev);
 642         return clp_disable_fh(zdev);
 643 }
 644
 645 struct dev_pm_ops pcibios_pm_ops = {
 646         .thaw_noirq = zpci_restore,
 647         .freeze_noirq = zpci_freeze,
 648         .restore_noirq = zpci_restore,
 649         .poweroff_noirq = zpci_freeze,
 650 };
 651 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 652
 653 static int zpci_alloc_domain(struct zpci_dev *zdev)
 654 {
 655         if (zpci_unique_uid) {
 656                 zdev->domain = (u16) zdev->uid;
 657                 if (zdev->domain >= ZPCI_NR_DEVICES)
 658                         return 0;
 659
 660                 spin_lock(&zpci_domain_lock);
 661                 if (test_bit(zdev->domain, zpci_domain)) {
 662                         spin_unlock(&zpci_domain_lock);
 663                         pr_err("Adding PCI function %08x failed because domain %04x is already assigned\n",
 664                                 zdev->fid, zdev->domain);
 665                         return -EEXIST;
 666                 }
 667                 set_bit(zdev->domain, zpci_domain);
 668                 spin_unlock(&zpci_domain_lock);
 669                 return 0;
 670         }
 671
 672         spin_lock(&zpci_domain_lock);
 673         zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
 674         if (zdev->domain == ZPCI_NR_DEVICES) {
 675                 spin_unlock(&zpci_domain_lock);
 676                 pr_err("Adding PCI function %08x failed because the configured limit of %d is reached\n",
 677                         zdev->fid, ZPCI_NR_DEVICES);
 678                 return -ENOSPC;
 679         }
 680         set_bit(zdev->domain, zpci_domain);
 681         spin_unlock(&zpci_domain_lock);
 682         return 0;
 683 }
 684
 685 static void zpci_free_domain(struct zpci_dev *zdev)
 686 {
 687         if (zdev->domain >= ZPCI_NR_DEVICES)
 688                 return;
 689
 690         spin_lock(&zpci_domain_lock);
 691         clear_bit(zdev->domain, zpci_domain);
 692         spin_unlock(&zpci_domain_lock);
 693 }
 694
 695 void pcibios_remove_bus(struct pci_bus *bus)
 696 {
 697         struct zpci_dev *zdev = get_zdev_by_bus(bus);
 698
 699         zpci_exit_slot(zdev);
 700         zpci_cleanup_bus_resources(zdev);
 701         zpci_destroy_iommu(zdev);
 702         zpci_free_domain(zdev);
 703
 704         spin_lock(&zpci_list_lock);
 705         list_del(&zdev->entry);
 706         spin_unlock(&zpci_list_lock);
 707
 708         zpci_dbg(3, "rem fid:%x\n", zdev->fid);
 709         kfree(zdev);
 710 }
 711
 712 static int zpci_scan_bus(struct zpci_dev *zdev)
 713 {
 714         LIST_HEAD(resources);
 715         int ret;
 716
 717         ret = zpci_setup_bus_resources(zdev, &resources);
 718         if (ret)
 719                 goto error;
 720
 721         zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
 722                                       zdev, &resources);
 723         if (!zdev->bus) {
 724                 ret = -EIO;
 725                 goto error;
 726         }
 727         zdev->bus->max_bus_speed = zdev->max_bus_speed;
 728         pci_bus_add_devices(zdev->bus);
 729         return 0;
 730
 731 error:
 732         zpci_cleanup_bus_resources(zdev);
 733         pci_free_resource_list(&resources);
 734         return ret;
 735 }
 736
 737 int zpci_enable_device(struct zpci_dev *zdev)
 738 {
 739         int rc;
 740
 741         rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 742         if (rc)
 743                 goto out;
 744
 745         rc = zpci_dma_init_device(zdev);
 746         if (rc)
 747                 goto out_dma;
 748
 749         zdev->state = ZPCI_FN_STATE_ONLINE;
 750         return 0;
 751
 752 out_dma:
 753         clp_disable_fh(zdev);
 754 out:
 755         return rc;
 756 }
 757 EXPORT_SYMBOL_GPL(zpci_enable_device);
 758
 759 int zpci_disable_device(struct zpci_dev *zdev)
 760 {
 761         zpci_dma_exit_device(zdev);
 762         return clp_disable_fh(zdev);
 763 }
 764 EXPORT_SYMBOL_GPL(zpci_disable_device);
 765
 766 int zpci_create_device(struct zpci_dev *zdev)
 767 {
 768         int rc;
 769
 770         rc = zpci_alloc_domain(zdev);
 771         if (rc)
 772                 goto out;
 773
 774         rc = zpci_init_iommu(zdev);
 775         if (rc)
 776                 goto out_free;
 777
 778         mutex_init(&zdev->lock);
 779         if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
 780                 rc = zpci_enable_device(zdev);
 781                 if (rc)
 782                         goto out_destroy_iommu;
 783         }
 784         rc = zpci_scan_bus(zdev);
 785         if (rc)
 786                 goto out_disable;
 787
 788         spin_lock(&zpci_list_lock);
 789         list_add_tail(&zdev->entry, &zpci_list);
 790         spin_unlock(&zpci_list_lock);
 791
 792         zpci_init_slot(zdev);
 793
 794         return 0;
 795
 796 out_disable:
 797         if (zdev->state == ZPCI_FN_STATE_ONLINE)
 798                 zpci_disable_device(zdev);
 799 out_destroy_iommu:
 800         zpci_destroy_iommu(zdev);
 801 out_free:
 802         zpci_free_domain(zdev);
 803 out:
 804         return rc;
 805 }
 806
 807 void zpci_remove_device(struct zpci_dev *zdev)
 808 {
 809         if (!zdev->bus)
 810                 return;
 811
 812         pci_stop_root_bus(zdev->bus);
 813         pci_remove_root_bus(zdev->bus);
 814 }
 815
 816 int zpci_report_error(struct pci_dev *pdev,
 817                       struct zpci_report_error_header *report)
 818 {
 819         struct zpci_dev *zdev = to_zpci(pdev);
 820
 821         return sclp_pci_report(report, zdev->fh, zdev->fid);
 822 }
 823 EXPORT_SYMBOL(zpci_report_error);
 824
 825 static int zpci_mem_init(void)
 826 {
 827         BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
 828                      __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
 829
 830         zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
 831                                            __alignof__(struct zpci_fmb), 0, NULL);
 832         if (!zdev_fmb_cache)
 833                 goto error_fmb;
 834
 835         zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
 836                                    sizeof(*zpci_iomap_start), GFP_KERNEL);
 837         if (!zpci_iomap_start)
 838                 goto error_iomap;
 839
 840         zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
 841                                     sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
 842         if (!zpci_iomap_bitmap)
 843                 goto error_iomap_bitmap;
 844
 845         return 0;
 846 error_iomap_bitmap:
 847         kfree(zpci_iomap_start);
 848 error_iomap:
 849         kmem_cache_destroy(zdev_fmb_cache);
 850 error_fmb:
 851         return -ENOMEM;
 852 }
 853
 854 static void zpci_mem_exit(void)
 855 {
 856         kfree(zpci_iomap_bitmap);
 857         kfree(zpci_iomap_start);
 858         kmem_cache_destroy(zdev_fmb_cache);
 859 }
 860
 861 static unsigned int s390_pci_probe __initdata = 1;
 862 static unsigned int s390_pci_no_mio __initdata;
 863 unsigned int s390_pci_force_floating __initdata;
 864 static unsigned int s390_pci_initialized;
 865
 866 char * __init pcibios_setup(char *str)
 867 {
 868         if (!strcmp(str, "off")) {
 869                 s390_pci_probe = 0;
 870                 return NULL;
 871         }
 872         if (!strcmp(str, "nomio")) {
 873                 s390_pci_no_mio = 1;
 874                 return NULL;
 875         }
 876         if (!strcmp(str, "force_floating")) {
 877                 s390_pci_force_floating = 1;
 878                 return NULL;
 879         }
 880         return str;
 881 }
 882
 883 bool zpci_is_enabled(void)
 884 {
 885         return s390_pci_initialized;
 886 }
 887
 888 static int __init pci_base_init(void)
 889 {
 890         int rc;
 891
 892         if (!s390_pci_probe)
 893                 return 0;
 894
 895         if (!test_facility(69) || !test_facility(71))
 896                 return 0;
 897
 898         if (test_facility(153) && !s390_pci_no_mio) {
 899                 static_branch_enable(&have_mio);
 900                 ctl_set_bit(2, 5);
 901         }
 902
 903         rc = zpci_debug_init();
 904         if (rc)
 905                 goto out;
 906
 907         rc = zpci_mem_init();
 908         if (rc)
 909                 goto out_mem;
 910
 911         rc = zpci_irq_init();
 912         if (rc)
 913                 goto out_irq;
 914
 915         rc = zpci_dma_init();
 916         if (rc)
 917                 goto out_dma;
 918
 919         rc = clp_scan_pci_devices();
 920         if (rc)
 921                 goto out_find;
 922
 923         s390_pci_initialized = 1;
 924         return 0;
 925
 926 out_find:
 927         zpci_dma_exit();
 928 out_dma:
 929         zpci_irq_exit();
 930 out_irq:
 931         zpci_mem_exit();
 932 out_mem:
 933         zpci_debug_exit();
 934 out:
 935         return rc;
 936 }
 937 subsys_initcall_sync(pci_base_init);
 938
 939 void zpci_rescan(void)
 940 {
 941         if (zpci_is_enabled())
 942                 clp_rescan_pci_devices_simple(NULL);
 943 }