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 #include "pci_bus.h"
  40 #include "pci_iov.h"
  41
  42 /* list of all detected zpci devices */
  43 static LIST_HEAD(zpci_list);
  44 static DEFINE_SPINLOCK(zpci_list_lock);
  45
  46 static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
  47 static DEFINE_SPINLOCK(zpci_domain_lock);
  48
  49 #define ZPCI_IOMAP_ENTRIES                                              \
  50         min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2),   \
  51             ZPCI_IOMAP_MAX_ENTRIES)
  52
  53 unsigned int s390_pci_no_rid;
  54
  55 static DEFINE_SPINLOCK(zpci_iomap_lock);
  56 static unsigned long *zpci_iomap_bitmap;
  57 struct zpci_iomap_entry *zpci_iomap_start;
  58 EXPORT_SYMBOL_GPL(zpci_iomap_start);
  59
  60 DEFINE_STATIC_KEY_FALSE(have_mio);
  61
  62 static struct kmem_cache *zdev_fmb_cache;
  63
  64 struct zpci_dev *get_zdev_by_fid(u32 fid)
  65 {
  66         struct zpci_dev *tmp, *zdev = NULL;
  67
  68         spin_lock(&zpci_list_lock);
  69         list_for_each_entry(tmp, &zpci_list, entry) {
  70                 if (tmp->fid == fid) {
  71                         zdev = tmp;
  72                         break;
  73                 }
  74         }
  75         spin_unlock(&zpci_list_lock);
  76         return zdev;
  77 }
  78
  79 void zpci_remove_reserved_devices(void)
  80 {
  81         struct zpci_dev *tmp, *zdev;
  82         enum zpci_state state;
  83         LIST_HEAD(remove);
  84
  85         spin_lock(&zpci_list_lock);
  86         list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
  87                 if (zdev->state == ZPCI_FN_STATE_STANDBY &&
  88                     !clp_get_state(zdev->fid, &state) &&
  89                     state == ZPCI_FN_STATE_RESERVED)
  90                         list_move_tail(&zdev->entry, &remove);
  91         }
  92         spin_unlock(&zpci_list_lock);
  93
  94         list_for_each_entry_safe(zdev, tmp, &remove, entry)
  95                 zpci_zdev_put(zdev);
  96 }
  97
  98 int pci_domain_nr(struct pci_bus *bus)
  99 {
 100         return ((struct zpci_bus *) bus->sysdata)->domain_nr;
 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 static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
 231 {
 232         unsigned long offset, vaddr;
 233         struct vm_struct *area;
 234         phys_addr_t last_addr;
 235
 236         last_addr = addr + size - 1;
 237         if (!size || last_addr < addr)
 238                 return NULL;
 239
 240         if (!static_branch_unlikely(&have_mio))
 241                 return (void __iomem *) addr;
 242
 243         offset = addr & ~PAGE_MASK;
 244         addr &= PAGE_MASK;
 245         size = PAGE_ALIGN(size + offset);
 246         area = get_vm_area(size, VM_IOREMAP);
 247         if (!area)
 248                 return NULL;
 249
 250         vaddr = (unsigned long) area->addr;
 251         if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
 252                 free_vm_area(area);
 253                 return NULL;
 254         }
 255         return (void __iomem *) ((unsigned long) area->addr + offset);
 256 }
 257
 258 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
 259 {
 260         return __ioremap(addr, size, __pgprot(prot));
 261 }
 262 EXPORT_SYMBOL(ioremap_prot);
 263
 264 void __iomem *ioremap(phys_addr_t addr, size_t size)
 265 {
 266         return __ioremap(addr, size, PAGE_KERNEL);
 267 }
 268 EXPORT_SYMBOL(ioremap);
 269
 270 void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
 271 {
 272         return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
 273 }
 274 EXPORT_SYMBOL(ioremap_wc);
 275
 276 void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
 277 {
 278         return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
 279 }
 280 EXPORT_SYMBOL(ioremap_wt);
 281
 282 void iounmap(volatile void __iomem *addr)
 283 {
 284         if (static_branch_likely(&have_mio))
 285                 vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
 286 }
 287 EXPORT_SYMBOL(iounmap);
 288
 289 /* Create a virtual mapping cookie for a PCI BAR */
 290 static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
 291                                         unsigned long offset, unsigned long max)
 292 {
 293         struct zpci_dev *zdev = to_zpci(pdev);
 294         int idx;
 295
 296         idx = zdev->bars[bar].map_idx;
 297         spin_lock(&zpci_iomap_lock);
 298         /* Detect overrun */
 299         WARN_ON(!++zpci_iomap_start[idx].count);
 300         zpci_iomap_start[idx].fh = zdev->fh;
 301         zpci_iomap_start[idx].bar = bar;
 302         spin_unlock(&zpci_iomap_lock);
 303
 304         return (void __iomem *) ZPCI_ADDR(idx) + offset;
 305 }
 306
 307 static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
 308                                          unsigned long offset,
 309                                          unsigned long max)
 310 {
 311         unsigned long barsize = pci_resource_len(pdev, bar);
 312         struct zpci_dev *zdev = to_zpci(pdev);
 313         void __iomem *iova;
 314
 315         iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
 316         return iova ? iova + offset : iova;
 317 }
 318
 319 void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
 320                               unsigned long offset, unsigned long max)
 321 {
 322         if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
 323                 return NULL;
 324
 325         if (static_branch_likely(&have_mio))
 326                 return pci_iomap_range_mio(pdev, bar, offset, max);
 327         else
 328                 return pci_iomap_range_fh(pdev, bar, offset, max);
 329 }
 330 EXPORT_SYMBOL(pci_iomap_range);
 331
 332 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 333 {
 334         return pci_iomap_range(dev, bar, 0, maxlen);
 335 }
 336 EXPORT_SYMBOL(pci_iomap);
 337
 338 static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
 339                                             unsigned long offset, unsigned long max)
 340 {
 341         unsigned long barsize = pci_resource_len(pdev, bar);
 342         struct zpci_dev *zdev = to_zpci(pdev);
 343         void __iomem *iova;
 344
 345         iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
 346         return iova ? iova + offset : iova;
 347 }
 348
 349 void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
 350                                  unsigned long offset, unsigned long max)
 351 {
 352         if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
 353                 return NULL;
 354
 355         if (static_branch_likely(&have_mio))
 356                 return pci_iomap_wc_range_mio(pdev, bar, offset, max);
 357         else
 358                 return pci_iomap_range_fh(pdev, bar, offset, max);
 359 }
 360 EXPORT_SYMBOL(pci_iomap_wc_range);
 361
 362 void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
 363 {
 364         return pci_iomap_wc_range(dev, bar, 0, maxlen);
 365 }
 366 EXPORT_SYMBOL(pci_iomap_wc);
 367
 368 static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
 369 {
 370         unsigned int idx = ZPCI_IDX(addr);
 371
 372         spin_lock(&zpci_iomap_lock);
 373         /* Detect underrun */
 374         WARN_ON(!zpci_iomap_start[idx].count);
 375         if (!--zpci_iomap_start[idx].count) {
 376                 zpci_iomap_start[idx].fh = 0;
 377                 zpci_iomap_start[idx].bar = 0;
 378         }
 379         spin_unlock(&zpci_iomap_lock);
 380 }
 381
 382 static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
 383 {
 384         iounmap(addr);
 385 }
 386
 387 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
 388 {
 389         if (static_branch_likely(&have_mio))
 390                 pci_iounmap_mio(pdev, addr);
 391         else
 392                 pci_iounmap_fh(pdev, addr);
 393 }
 394 EXPORT_SYMBOL(pci_iounmap);
 395
 396 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 397                     int size, u32 *val)
 398 {
 399         struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
 400
 401         return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
 402 }
 403
 404 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 405                      int size, u32 val)
 406 {
 407         struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
 408
 409         return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
 410 }
 411
 412 static struct pci_ops pci_root_ops = {
 413         .read = pci_read,
 414         .write = pci_write,
 415 };
 416
 417 static void zpci_map_resources(struct pci_dev *pdev)
 418 {
 419         struct zpci_dev *zdev = to_zpci(pdev);
 420         resource_size_t len;
 421         int i;
 422
 423         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 424                 len = pci_resource_len(pdev, i);
 425                 if (!len)
 426                         continue;
 427
 428                 if (zpci_use_mio(zdev))
 429                         pdev->resource[i].start =
 430                                 (resource_size_t __force) zdev->bars[i].mio_wt;
 431                 else
 432                         pdev->resource[i].start = (resource_size_t __force)
 433                                 pci_iomap_range_fh(pdev, i, 0, 0);
 434                 pdev->resource[i].end = pdev->resource[i].start + len - 1;
 435         }
 436
 437         zpci_iov_map_resources(pdev);
 438 }
 439
 440 static void zpci_unmap_resources(struct pci_dev *pdev)
 441 {
 442         struct zpci_dev *zdev = to_zpci(pdev);
 443         resource_size_t len;
 444         int i;
 445
 446         if (zpci_use_mio(zdev))
 447                 return;
 448
 449         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 450                 len = pci_resource_len(pdev, i);
 451                 if (!len)
 452                         continue;
 453                 pci_iounmap_fh(pdev, (void __iomem __force *)
 454                                pdev->resource[i].start);
 455         }
 456 }
 457
 458 static int zpci_alloc_iomap(struct zpci_dev *zdev)
 459 {
 460         unsigned long entry;
 461
 462         spin_lock(&zpci_iomap_lock);
 463         entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
 464         if (entry == ZPCI_IOMAP_ENTRIES) {
 465                 spin_unlock(&zpci_iomap_lock);
 466                 return -ENOSPC;
 467         }
 468         set_bit(entry, zpci_iomap_bitmap);
 469         spin_unlock(&zpci_iomap_lock);
 470         return entry;
 471 }
 472
 473 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
 474 {
 475         spin_lock(&zpci_iomap_lock);
 476         memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
 477         clear_bit(entry, zpci_iomap_bitmap);
 478         spin_unlock(&zpci_iomap_lock);
 479 }
 480
 481 static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
 482                                     unsigned long size, unsigned long flags)
 483 {
 484         struct resource *r;
 485
 486         r = kzalloc(sizeof(*r), GFP_KERNEL);
 487         if (!r)
 488                 return NULL;
 489
 490         r->start = start;
 491         r->end = r->start + size - 1;
 492         r->flags = flags;
 493         r->name = zdev->res_name;
 494
 495         if (request_resource(&iomem_resource, r)) {
 496                 kfree(r);
 497                 return NULL;
 498         }
 499         return r;
 500 }
 501
 502 int zpci_setup_bus_resources(struct zpci_dev *zdev,
 503                              struct list_head *resources)
 504 {
 505         unsigned long addr, size, flags;
 506         struct resource *res;
 507         int i, entry;
 508
 509         snprintf(zdev->res_name, sizeof(zdev->res_name),
 510                  "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
 511
 512         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 513                 if (!zdev->bars[i].size)
 514                         continue;
 515                 entry = zpci_alloc_iomap(zdev);
 516                 if (entry < 0)
 517                         return entry;
 518                 zdev->bars[i].map_idx = entry;
 519
 520                 /* only MMIO is supported */
 521                 flags = IORESOURCE_MEM;
 522                 if (zdev->bars[i].val & 8)
 523                         flags |= IORESOURCE_PREFETCH;
 524                 if (zdev->bars[i].val & 4)
 525                         flags |= IORESOURCE_MEM_64;
 526
 527                 if (zpci_use_mio(zdev))
 528                         addr = (unsigned long) zdev->bars[i].mio_wt;
 529                 else
 530                         addr = ZPCI_ADDR(entry);
 531                 size = 1UL << zdev->bars[i].size;
 532
 533                 res = __alloc_res(zdev, addr, size, flags);
 534                 if (!res) {
 535                         zpci_free_iomap(zdev, entry);
 536                         return -ENOMEM;
 537                 }
 538                 zdev->bars[i].res = res;
 539                 pci_add_resource(resources, res);
 540         }
 541
 542         return 0;
 543 }
 544
 545 static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
 546 {
 547         int i;
 548
 549         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 550                 if (!zdev->bars[i].size || !zdev->bars[i].res)
 551                         continue;
 552
 553                 zpci_free_iomap(zdev, zdev->bars[i].map_idx);
 554                 release_resource(zdev->bars[i].res);
 555                 kfree(zdev->bars[i].res);
 556         }
 557 }
 558
 559 int pcibios_add_device(struct pci_dev *pdev)
 560 {
 561         struct resource *res;
 562         int i;
 563
 564         if (pdev->is_physfn)
 565                 pdev->no_vf_scan = 1;
 566
 567         pdev->dev.groups = zpci_attr_groups;
 568         pdev->dev.dma_ops = &s390_pci_dma_ops;
 569         zpci_map_resources(pdev);
 570
 571         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 572                 res = &pdev->resource[i];
 573                 if (res->parent || !res->flags)
 574                         continue;
 575                 pci_claim_resource(pdev, i);
 576         }
 577
 578         return 0;
 579 }
 580
 581 void pcibios_release_device(struct pci_dev *pdev)
 582 {
 583         zpci_unmap_resources(pdev);
 584 }
 585
 586 int pcibios_enable_device(struct pci_dev *pdev, int mask)
 587 {
 588         struct zpci_dev *zdev = to_zpci(pdev);
 589
 590         zpci_debug_init_device(zdev, dev_name(&pdev->dev));
 591         zpci_fmb_enable_device(zdev);
 592
 593         return pci_enable_resources(pdev, mask);
 594 }
 595
 596 void pcibios_disable_device(struct pci_dev *pdev)
 597 {
 598         struct zpci_dev *zdev = to_zpci(pdev);
 599
 600         zpci_fmb_disable_device(zdev);
 601         zpci_debug_exit_device(zdev);
 602 }
 603
 604 static int __zpci_register_domain(int domain)
 605 {
 606         spin_lock(&zpci_domain_lock);
 607         if (test_bit(domain, zpci_domain)) {
 608                 spin_unlock(&zpci_domain_lock);
 609                 pr_err("Domain %04x is already assigned\n", domain);
 610                 return -EEXIST;
 611         }
 612         set_bit(domain, zpci_domain);
 613         spin_unlock(&zpci_domain_lock);
 614         return domain;
 615 }
 616
 617 static int __zpci_alloc_domain(void)
 618 {
 619         int domain;
 620
 621         spin_lock(&zpci_domain_lock);
 622         /*
 623          * We can always auto allocate domains below ZPCI_NR_DEVICES.
 624          * There is either a free domain or we have reached the maximum in
 625          * which case we would have bailed earlier.
 626          */
 627         domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
 628         set_bit(domain, zpci_domain);
 629         spin_unlock(&zpci_domain_lock);
 630         return domain;
 631 }
 632
 633 int zpci_alloc_domain(int domain)
 634 {
 635         if (zpci_unique_uid) {
 636                 if (domain)
 637                         return __zpci_register_domain(domain);
 638                 pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
 639                 update_uid_checking(false);
 640         }
 641         return __zpci_alloc_domain();
 642 }
 643
 644 void zpci_free_domain(int domain)
 645 {
 646         spin_lock(&zpci_domain_lock);
 647         clear_bit(domain, zpci_domain);
 648         spin_unlock(&zpci_domain_lock);
 649 }
 650
 651
 652 int zpci_enable_device(struct zpci_dev *zdev)
 653 {
 654         int rc;
 655
 656         rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
 657         if (rc)
 658                 goto out;
 659
 660         rc = zpci_dma_init_device(zdev);
 661         if (rc)
 662                 goto out_dma;
 663
 664         zdev->state = ZPCI_FN_STATE_ONLINE;
 665         return 0;
 666
 667 out_dma:
 668         clp_disable_fh(zdev);
 669 out:
 670         return rc;
 671 }
 672 EXPORT_SYMBOL_GPL(zpci_enable_device);
 673
 674 int zpci_disable_device(struct zpci_dev *zdev)
 675 {
 676         zpci_dma_exit_device(zdev);
 677         /*
 678          * The zPCI function may already be disabled by the platform, this is
 679          * detected in clp_disable_fh() which becomes a no-op.
 680          */
 681         return clp_disable_fh(zdev);
 682 }
 683 EXPORT_SYMBOL_GPL(zpci_disable_device);
 684
 685 void zpci_remove_device(struct zpci_dev *zdev)
 686 {
 687         struct zpci_bus *zbus = zdev->zbus;
 688         struct pci_dev *pdev;
 689
 690         pdev = pci_get_slot(zbus->bus, zdev->devfn);
 691         if (pdev) {
 692                 if (pdev->is_virtfn)
 693                         return zpci_iov_remove_virtfn(pdev, zdev->vfn);
 694                 pci_stop_and_remove_bus_device_locked(pdev);
 695         }
 696 }
 697
 698 int zpci_create_device(struct zpci_dev *zdev)
 699 {
 700         int rc;
 701
 702         kref_init(&zdev->kref);
 703
 704         spin_lock(&zpci_list_lock);
 705         list_add_tail(&zdev->entry, &zpci_list);
 706         spin_unlock(&zpci_list_lock);
 707
 708         rc = zpci_init_iommu(zdev);
 709         if (rc)
 710                 goto out;
 711
 712         mutex_init(&zdev->lock);
 713         if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
 714                 rc = zpci_enable_device(zdev);
 715                 if (rc)
 716                         goto out_destroy_iommu;
 717         }
 718
 719         rc = zpci_bus_device_register(zdev, &pci_root_ops);
 720         if (rc)
 721                 goto out_disable;
 722
 723         return 0;
 724
 725 out_disable:
 726         if (zdev->state == ZPCI_FN_STATE_ONLINE)
 727                 zpci_disable_device(zdev);
 728
 729 out_destroy_iommu:
 730         zpci_destroy_iommu(zdev);
 731 out:
 732         spin_lock(&zpci_list_lock);
 733         list_del(&zdev->entry);
 734         spin_unlock(&zpci_list_lock);
 735         return rc;
 736 }
 737
 738 void zpci_release_device(struct kref *kref)
 739 {
 740         struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
 741
 742         if (zdev->zbus->bus)
 743                 zpci_remove_device(zdev);
 744
 745         switch (zdev->state) {
 746         case ZPCI_FN_STATE_ONLINE:
 747         case ZPCI_FN_STATE_CONFIGURED:
 748                 zpci_disable_device(zdev);
 749                 fallthrough;
 750         case ZPCI_FN_STATE_STANDBY:
 751                 if (zdev->has_hp_slot)
 752                         zpci_exit_slot(zdev);
 753                 zpci_cleanup_bus_resources(zdev);
 754                 zpci_bus_device_unregister(zdev);
 755                 zpci_destroy_iommu(zdev);
 756                 fallthrough;
 757         default:
 758                 break;
 759         }
 760
 761         spin_lock(&zpci_list_lock);
 762         list_del(&zdev->entry);
 763         spin_unlock(&zpci_list_lock);
 764         zpci_dbg(3, "rem fid:%x\n", zdev->fid);
 765         kfree(zdev);
 766 }
 767
 768 int zpci_report_error(struct pci_dev *pdev,
 769                       struct zpci_report_error_header *report)
 770 {
 771         struct zpci_dev *zdev = to_zpci(pdev);
 772
 773         return sclp_pci_report(report, zdev->fh, zdev->fid);
 774 }
 775 EXPORT_SYMBOL(zpci_report_error);
 776
 777 static int zpci_mem_init(void)
 778 {
 779         BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
 780                      __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
 781
 782         zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
 783                                            __alignof__(struct zpci_fmb), 0, NULL);
 784         if (!zdev_fmb_cache)
 785                 goto error_fmb;
 786
 787         zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
 788                                    sizeof(*zpci_iomap_start), GFP_KERNEL);
 789         if (!zpci_iomap_start)
 790                 goto error_iomap;
 791
 792         zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
 793                                     sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
 794         if (!zpci_iomap_bitmap)
 795                 goto error_iomap_bitmap;
 796
 797         if (static_branch_likely(&have_mio))
 798                 clp_setup_writeback_mio();
 799
 800         return 0;
 801 error_iomap_bitmap:
 802         kfree(zpci_iomap_start);
 803 error_iomap:
 804         kmem_cache_destroy(zdev_fmb_cache);
 805 error_fmb:
 806         return -ENOMEM;
 807 }
 808
 809 static void zpci_mem_exit(void)
 810 {
 811         kfree(zpci_iomap_bitmap);
 812         kfree(zpci_iomap_start);
 813         kmem_cache_destroy(zdev_fmb_cache);
 814 }
 815
 816 static unsigned int s390_pci_probe __initdata = 1;
 817 static unsigned int s390_pci_no_mio __initdata;
 818 unsigned int s390_pci_force_floating __initdata;
 819 static unsigned int s390_pci_initialized;
 820
 821 char * __init pcibios_setup(char *str)
 822 {
 823         if (!strcmp(str, "off")) {
 824                 s390_pci_probe = 0;
 825                 return NULL;
 826         }
 827         if (!strcmp(str, "nomio")) {
 828                 s390_pci_no_mio = 1;
 829                 return NULL;
 830         }
 831         if (!strcmp(str, "force_floating")) {
 832                 s390_pci_force_floating = 1;
 833                 return NULL;
 834         }
 835         if (!strcmp(str, "norid")) {
 836                 s390_pci_no_rid = 1;
 837                 return NULL;
 838         }
 839         return str;
 840 }
 841
 842 bool zpci_is_enabled(void)
 843 {
 844         return s390_pci_initialized;
 845 }
 846
 847 static int __init pci_base_init(void)
 848 {
 849         int rc;
 850
 851         if (!s390_pci_probe)
 852                 return 0;
 853
 854         if (!test_facility(69) || !test_facility(71)) {
 855                 pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
 856                 return 0;
 857         }
 858
 859         if (test_facility(153) && !s390_pci_no_mio) {
 860                 static_branch_enable(&have_mio);
 861                 ctl_set_bit(2, 5);
 862         }
 863
 864         rc = zpci_debug_init();
 865         if (rc)
 866                 goto out;
 867
 868         rc = zpci_mem_init();
 869         if (rc)
 870                 goto out_mem;
 871
 872         rc = zpci_irq_init();
 873         if (rc)
 874                 goto out_irq;
 875
 876         rc = zpci_dma_init();
 877         if (rc)
 878                 goto out_dma;
 879
 880         rc = clp_scan_pci_devices();
 881         if (rc)
 882                 goto out_find;
 883
 884         s390_pci_initialized = 1;
 885         return 0;
 886
 887 out_find:
 888         zpci_dma_exit();
 889 out_dma:
 890         zpci_irq_exit();
 891 out_irq:
 892         zpci_mem_exit();
 893 out_mem:
 894         zpci_debug_exit();
 895 out:
 896         return rc;
 897 }
 898 subsys_initcall_sync(pci_base_init);