drivers/pci/setup-bus.c

   1 /*
   2  *      drivers/pci/setup-bus.c
   3  *
   4  * Extruded from code written by
   5  *      Dave Rusling (david.rusling@reo.mts.dec.com)
   6  *      David Mosberger (davidm@cs.arizona.edu)
   7  *      David Miller (davem@redhat.com)
   8  *
   9  * Support routines for initializing a PCI subsystem.
  10  */
  11
  12 /*
  13  * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
  14  *           PCI-PCI bridges cleanup, sorted resource allocation.
  15  * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
  16  *           Converted to allocation in 3 passes, which gives
  17  *           tighter packing. Prefetchable range support.
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/pci.h>
  24 #include <linux/errno.h>
  25 #include <linux/ioport.h>
  26 #include <linux/cache.h>
  27 #include <linux/slab.h>
  28
  29
  30 static void pbus_assign_resources_sorted(const struct pci_bus *bus)
  31 {
  32         struct pci_dev *dev;
  33         struct resource *res;
  34         struct resource_list head, *list, *tmp;
  35         int idx;
  36
  37         head.next = NULL;
  38         list_for_each_entry(dev, &bus->devices, bus_list) {
  39                 u16 class = dev->class >> 8;
  40
  41                 /* Don't touch classless devices or host bridges or ioapics.  */
  42                 if (class == PCI_CLASS_NOT_DEFINED ||
  43                     class == PCI_CLASS_BRIDGE_HOST)
  44                         continue;
  45
  46                 /* Don't touch ioapic devices already enabled by firmware */
  47                 if (class == PCI_CLASS_SYSTEM_PIC) {
  48                         u16 command;
  49                         pci_read_config_word(dev, PCI_COMMAND, &command);
  50                         if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
  51                                 continue;
  52                 }
  53
  54                 pdev_sort_resources(dev, &head);
  55         }
  56
  57         for (list = head.next; list;) {
  58                 res = list->res;
  59                 idx = res - &list->dev->resource[0];
  60                 if (pci_assign_resource(list->dev, idx)) {
  61                         res->start = 0;
  62                         res->end = 0;
  63                         res->flags = 0;
  64                 }
  65                 tmp = list;
  66                 list = list->next;
  67                 kfree(tmp);
  68         }
  69 }
  70
  71 void pci_setup_cardbus(struct pci_bus *bus)
  72 {
  73         struct pci_dev *bridge = bus->self;
  74         struct pci_bus_region region;
  75
  76         dev_info(&bridge->dev, "CardBus bridge, secondary bus %04x:%02x\n",
  77                  pci_domain_nr(bus), bus->number);
  78
  79         pcibios_resource_to_bus(bridge, &region, bus->resource[0]);
  80         if (bus->resource[0]->flags & IORESOURCE_IO) {
  81                 /*
  82                  * The IO resource is allocated a range twice as large as it
  83                  * would normally need.  This allows us to set both IO regs.
  84                  */
  85                 dev_info(&bridge->dev, "  IO window: %#08lx-%#08lx\n",
  86                        (unsigned long)region.start,
  87                        (unsigned long)region.end);
  88                 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
  89                                         region.start);
  90                 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
  91                                         region.end);
  92         }
  93
  94         pcibios_resource_to_bus(bridge, &region, bus->resource[1]);
  95         if (bus->resource[1]->flags & IORESOURCE_IO) {
  96                 dev_info(&bridge->dev, "  IO window: %#08lx-%#08lx\n",
  97                        (unsigned long)region.start,
  98                        (unsigned long)region.end);
  99                 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
 100                                         region.start);
 101                 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
 102                                         region.end);
 103         }
 104
 105         pcibios_resource_to_bus(bridge, &region, bus->resource[2]);
 106         if (bus->resource[2]->flags & IORESOURCE_MEM) {
 107                 dev_info(&bridge->dev, "  PREFETCH window: %#08lx-%#08lx\n",
 108                        (unsigned long)region.start,
 109                        (unsigned long)region.end);
 110                 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
 111                                         region.start);
 112                 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
 113                                         region.end);
 114         }
 115
 116         pcibios_resource_to_bus(bridge, &region, bus->resource[3]);
 117         if (bus->resource[3]->flags & IORESOURCE_MEM) {
 118                 dev_info(&bridge->dev, "  MEM window: %#08lx-%#08lx\n",
 119                        (unsigned long)region.start,
 120                        (unsigned long)region.end);
 121                 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
 122                                         region.start);
 123                 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
 124                                         region.end);
 125         }
 126 }
 127 EXPORT_SYMBOL(pci_setup_cardbus);
 128
 129 /* Initialize bridges with base/limit values we have collected.
 130    PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
 131    requires that if there is no I/O ports or memory behind the
 132    bridge, corresponding range must be turned off by writing base
 133    value greater than limit to the bridge's base/limit registers.
 134
 135    Note: care must be taken when updating I/O base/limit registers
 136    of bridges which support 32-bit I/O. This update requires two
 137    config space writes, so it's quite possible that an I/O window of
 138    the bridge will have some undesirable address (e.g. 0) after the
 139    first write. Ditto 64-bit prefetchable MMIO.  */
 140 static void pci_setup_bridge(struct pci_bus *bus)
 141 {
 142         struct pci_dev *bridge = bus->self;
 143         struct pci_bus_region region;
 144         u32 l, bu, lu, io_upper16;
 145         int pref_mem64;
 146
 147         if (pci_is_enabled(bridge))
 148                 return;
 149
 150         dev_info(&bridge->dev, "PCI bridge, secondary bus %04x:%02x\n",
 151                  pci_domain_nr(bus), bus->number);
 152
 153         /* Set up the top and bottom of the PCI I/O segment for this bus. */
 154         pcibios_resource_to_bus(bridge, &region, bus->resource[0]);
 155         if (bus->resource[0]->flags & IORESOURCE_IO) {
 156                 pci_read_config_dword(bridge, PCI_IO_BASE, &l);
 157                 l &= 0xffff0000;
 158                 l |= (region.start >> 8) & 0x00f0;
 159                 l |= region.end & 0xf000;
 160                 /* Set up upper 16 bits of I/O base/limit. */
 161                 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
 162                 dev_info(&bridge->dev, "  IO window: %#04lx-%#04lx\n",
 163                     (unsigned long)region.start,
 164                     (unsigned long)region.end);
 165         }
 166         else {
 167                 /* Clear upper 16 bits of I/O base/limit. */
 168                 io_upper16 = 0;
 169                 l = 0x00f0;
 170                 dev_info(&bridge->dev, "  IO window: disabled\n");
 171         }
 172         /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
 173         pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
 174         /* Update lower 16 bits of I/O base/limit. */
 175         pci_write_config_dword(bridge, PCI_IO_BASE, l);
 176         /* Update upper 16 bits of I/O base/limit. */
 177         pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
 178
 179         /* Set up the top and bottom of the PCI Memory segment
 180            for this bus. */
 181         pcibios_resource_to_bus(bridge, &region, bus->resource[1]);
 182         if (bus->resource[1]->flags & IORESOURCE_MEM) {
 183                 l = (region.start >> 16) & 0xfff0;
 184                 l |= region.end & 0xfff00000;
 185                 dev_info(&bridge->dev, "  MEM window: %#08lx-%#08lx\n",
 186                     (unsigned long)region.start,
 187                     (unsigned long)region.end);
 188         }
 189         else {
 190                 l = 0x0000fff0;
 191                 dev_info(&bridge->dev, "  MEM window: disabled\n");
 192         }
 193         pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
 194
 195         /* Clear out the upper 32 bits of PREF limit.
 196            If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
 197            disables PREF range, which is ok. */
 198         pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
 199
 200         /* Set up PREF base/limit. */
 201         pref_mem64 = 0;
 202         bu = lu = 0;
 203         pcibios_resource_to_bus(bridge, &region, bus->resource[2]);
 204         if (bus->resource[2]->flags & IORESOURCE_PREFETCH) {
 205                 int width = 8;
 206                 l = (region.start >> 16) & 0xfff0;
 207                 l |= region.end & 0xfff00000;
 208                 if (bus->resource[2]->flags & IORESOURCE_MEM_64) {
 209                         pref_mem64 = 1;
 210                         bu = upper_32_bits(region.start);
 211                         lu = upper_32_bits(region.end);
 212                         width = 16;
 213                 }
 214                 dev_info(&bridge->dev, "  PREFETCH window: %#0*llx-%#0*llx\n",
 215                                 width, (unsigned long long)region.start,
 216                                 width, (unsigned long long)region.end);
 217         }
 218         else {
 219                 l = 0x0000fff0;
 220                 dev_info(&bridge->dev, "  PREFETCH window: disabled\n");
 221         }
 222         pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
 223
 224         if (pref_mem64) {
 225                 /* Set the upper 32 bits of PREF base & limit. */
 226                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
 227                 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
 228         }
 229
 230         pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
 231 }
 232
 233 /* Check whether the bridge supports optional I/O and
 234    prefetchable memory ranges. If not, the respective
 235    base/limit registers must be read-only and read as 0. */
 236 static void pci_bridge_check_ranges(struct pci_bus *bus)
 237 {
 238         u16 io;
 239         u32 pmem;
 240         struct pci_dev *bridge = bus->self;
 241         struct resource *b_res;
 242
 243         b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
 244         b_res[1].flags |= IORESOURCE_MEM;
 245
 246         pci_read_config_word(bridge, PCI_IO_BASE, &io);
 247         if (!io) {
 248                 pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0);
 249                 pci_read_config_word(bridge, PCI_IO_BASE, &io);
 250                 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
 251         }
 252         if (io)
 253                 b_res[0].flags |= IORESOURCE_IO;
 254         /*  DECchip 21050 pass 2 errata: the bridge may miss an address
 255             disconnect boundary by one PCI data phase.
 256             Workaround: do not use prefetching on this device. */
 257         if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
 258                 return;
 259         pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 260         if (!pmem) {
 261                 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
 262                                                0xfff0fff0);
 263                 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 264                 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
 265         }
 266         if (pmem) {
 267                 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
 268                 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64)
 269                         b_res[2].flags |= IORESOURCE_MEM_64;
 270         }
 271
 272         /* double check if bridge does support 64 bit pref */
 273         if (b_res[2].flags & IORESOURCE_MEM_64) {
 274                 u32 mem_base_hi, tmp;
 275                 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 276                                          &mem_base_hi);
 277                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 278                                                0xffffffff);
 279                 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
 280                 if (!tmp)
 281                         b_res[2].flags &= ~IORESOURCE_MEM_64;
 282                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 283                                        mem_base_hi);
 284         }
 285 }
 286
 287 /* Helper function for sizing routines: find first available
 288    bus resource of a given type. Note: we intentionally skip
 289    the bus resources which have already been assigned (that is,
 290    have non-NULL parent resource). */
 291 static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
 292 {
 293         int i;
 294         struct resource *r;
 295         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
 296                                   IORESOURCE_PREFETCH;
 297
 298         for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
 299                 r = bus->resource[i];
 300                 if (r == &ioport_resource || r == &iomem_resource)
 301                         continue;
 302                 if (r && (r->flags & type_mask) == type && !r->parent)
 303                         return r;
 304         }
 305         return NULL;
 306 }
 307
 308 /* Sizing the IO windows of the PCI-PCI bridge is trivial,
 309    since these windows have 4K granularity and the IO ranges
 310    of non-bridge PCI devices are limited to 256 bytes.
 311    We must be careful with the ISA aliasing though. */
 312 static void pbus_size_io(struct pci_bus *bus)
 313 {
 314         struct pci_dev *dev;
 315         struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
 316         unsigned long size = 0, size1 = 0;
 317
 318         if (!b_res)
 319                 return;
 320
 321         list_for_each_entry(dev, &bus->devices, bus_list) {
 322                 int i;
 323
 324                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 325                         struct resource *r = &dev->resource[i];
 326                         unsigned long r_size;
 327
 328                         if (r->parent || !(r->flags & IORESOURCE_IO))
 329                                 continue;
 330                         r_size = resource_size(r);
 331
 332                         if (r_size < 0x400)
 333                                 /* Might be re-aligned for ISA */
 334                                 size += r_size;
 335                         else
 336                                 size1 += r_size;
 337                 }
 338         }
 339 /* To be fixed in 2.5: we should have sort of HAVE_ISA
 340    flag in the struct pci_bus. */
 341 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
 342         size = (size & 0xff) + ((size & ~0xffUL) << 2);
 343 #endif
 344         size = ALIGN(size + size1, 4096);
 345         if (!size) {
 346                 b_res->flags = 0;
 347                 return;
 348         }
 349         /* Alignment of the IO window is always 4K */
 350         b_res->start = 4096;
 351         b_res->end = b_res->start + size - 1;
 352         b_res->flags |= IORESOURCE_STARTALIGN;
 353 }
 354
 355 /* Calculate the size of the bus and minimal alignment which
 356    guarantees that all child resources fit in this size. */
 357 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type)
 358 {
 359         struct pci_dev *dev;
 360         resource_size_t min_align, align, size;
 361         resource_size_t aligns[12];     /* Alignments from 1Mb to 2Gb */
 362         int order, max_order;
 363         struct resource *b_res = find_free_bus_resource(bus, type);
 364         unsigned int mem64_mask = 0;
 365
 366         if (!b_res)
 367                 return 0;
 368
 369         memset(aligns, 0, sizeof(aligns));
 370         max_order = 0;
 371         size = 0;
 372
 373         mem64_mask = b_res->flags & IORESOURCE_MEM_64;
 374         b_res->flags &= ~IORESOURCE_MEM_64;
 375
 376         list_for_each_entry(dev, &bus->devices, bus_list) {
 377                 int i;
 378
 379                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 380                         struct resource *r = &dev->resource[i];
 381                         resource_size_t r_size;
 382
 383                         if (r->parent || (r->flags & mask) != type)
 384                                 continue;
 385                         r_size = resource_size(r);
 386                         /* For bridges size != alignment */
 387                         align = resource_alignment(r);
 388                         order = __ffs(align) - 20;
 389                         if (order > 11) {
 390                                 dev_warn(&dev->dev, "BAR %d bad alignment %llx: "
 391                                          "%pR\n", i, (unsigned long long)align, r);
 392                                 r->flags = 0;
 393                                 continue;
 394                         }
 395                         size += r_size;
 396                         if (order < 0)
 397                                 order = 0;
 398                         /* Exclude ranges with size > align from
 399                            calculation of the alignment. */
 400                         if (r_size == align)
 401                                 aligns[order] += align;
 402                         if (order > max_order)
 403                                 max_order = order;
 404                         mem64_mask &= r->flags & IORESOURCE_MEM_64;
 405                 }
 406         }
 407
 408         align = 0;
 409         min_align = 0;
 410         for (order = 0; order <= max_order; order++) {
 411                 resource_size_t align1 = 1;
 412
 413                 align1 <<= (order + 20);
 414
 415                 if (!align)
 416                         min_align = align1;
 417                 else if (ALIGN(align + min_align, min_align) < align1)
 418                         min_align = align1 >> 1;
 419                 align += aligns[order];
 420         }
 421         size = ALIGN(size, min_align);
 422         if (!size) {
 423                 b_res->flags = 0;
 424                 return 1;
 425         }
 426         b_res->start = min_align;
 427         b_res->end = size + min_align - 1;
 428         b_res->flags |= IORESOURCE_STARTALIGN;
 429         b_res->flags |= mem64_mask;
 430         return 1;
 431 }
 432
 433 static void pci_bus_size_cardbus(struct pci_bus *bus)
 434 {
 435         struct pci_dev *bridge = bus->self;
 436         struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
 437         u16 ctrl;
 438
 439         /*
 440          * Reserve some resources for CardBus.  We reserve
 441          * a fixed amount of bus space for CardBus bridges.
 442          */
 443         b_res[0].start = 0;
 444         b_res[0].end = pci_cardbus_io_size - 1;
 445         b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 446
 447         b_res[1].start = 0;
 448         b_res[1].end = pci_cardbus_io_size - 1;
 449         b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 450
 451         /*
 452          * Check whether prefetchable memory is supported
 453          * by this bridge.
 454          */
 455         pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
 456         if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
 457                 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
 458                 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
 459                 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
 460         }
 461
 462         /*
 463          * If we have prefetchable memory support, allocate
 464          * two regions.  Otherwise, allocate one region of
 465          * twice the size.
 466          */
 467         if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
 468                 b_res[2].start = 0;
 469                 b_res[2].end = pci_cardbus_mem_size - 1;
 470                 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
 471
 472                 b_res[3].start = 0;
 473                 b_res[3].end = pci_cardbus_mem_size - 1;
 474                 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 475         } else {
 476                 b_res[3].start = 0;
 477                 b_res[3].end = pci_cardbus_mem_size * 2 - 1;
 478                 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 479         }
 480 }
 481
 482 void __ref pci_bus_size_bridges(struct pci_bus *bus)
 483 {
 484         struct pci_dev *dev;
 485         unsigned long mask, prefmask;
 486
 487         list_for_each_entry(dev, &bus->devices, bus_list) {
 488                 struct pci_bus *b = dev->subordinate;
 489                 if (!b)
 490                         continue;
 491
 492                 switch (dev->class >> 8) {
 493                 case PCI_CLASS_BRIDGE_CARDBUS:
 494                         pci_bus_size_cardbus(b);
 495                         break;
 496
 497                 case PCI_CLASS_BRIDGE_PCI:
 498                 default:
 499                         pci_bus_size_bridges(b);
 500                         break;
 501                 }
 502         }
 503
 504         /* The root bus? */
 505         if (!bus->self)
 506                 return;
 507
 508         switch (bus->self->class >> 8) {
 509         case PCI_CLASS_BRIDGE_CARDBUS:
 510                 /* don't size cardbuses yet. */
 511                 break;
 512
 513         case PCI_CLASS_BRIDGE_PCI:
 514                 pci_bridge_check_ranges(bus);
 515         default:
 516                 pbus_size_io(bus);
 517                 /* If the bridge supports prefetchable range, size it
 518                    separately. If it doesn't, or its prefetchable window
 519                    has already been allocated by arch code, try
 520                    non-prefetchable range for both types of PCI memory
 521                    resources. */
 522                 mask = IORESOURCE_MEM;
 523                 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 524                 if (pbus_size_mem(bus, prefmask, prefmask))
 525                         mask = prefmask; /* Success, size non-prefetch only. */
 526                 pbus_size_mem(bus, mask, IORESOURCE_MEM);
 527                 break;
 528         }
 529 }
 530 EXPORT_SYMBOL(pci_bus_size_bridges);
 531
 532 void __ref pci_bus_assign_resources(const struct pci_bus *bus)
 533 {
 534         struct pci_bus *b;
 535         struct pci_dev *dev;
 536
 537         pbus_assign_resources_sorted(bus);
 538
 539         list_for_each_entry(dev, &bus->devices, bus_list) {
 540                 b = dev->subordinate;
 541                 if (!b)
 542                         continue;
 543
 544                 pci_bus_assign_resources(b);
 545
 546                 switch (dev->class >> 8) {
 547                 case PCI_CLASS_BRIDGE_PCI:
 548                         pci_setup_bridge(b);
 549                         break;
 550
 551                 case PCI_CLASS_BRIDGE_CARDBUS:
 552                         pci_setup_cardbus(b);
 553                         break;
 554
 555                 default:
 556                         dev_info(&dev->dev, "not setting up bridge for bus "
 557                                  "%04x:%02x\n", pci_domain_nr(b), b->number);
 558                         break;
 559                 }
 560         }
 561 }
 562 EXPORT_SYMBOL(pci_bus_assign_resources);
 563
 564 static void pci_bus_dump_res(struct pci_bus *bus)
 565 {
 566         int i;
 567
 568         for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
 569                 struct resource *res = bus->resource[i];
 570                 if (!res || !res->end)
 571                         continue;
 572
 573                 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %s %pR\n", i,
 574                            (res->flags & IORESOURCE_IO) ? "io: " :
 575                             ((res->flags & IORESOURCE_PREFETCH)? "pref mem":"mem:"),
 576                            res);
 577         }
 578 }
 579
 580 static void pci_bus_dump_resources(struct pci_bus *bus)
 581 {
 582         struct pci_bus *b;
 583         struct pci_dev *dev;
 584
 585
 586         pci_bus_dump_res(bus);
 587
 588         list_for_each_entry(dev, &bus->devices, bus_list) {
 589                 b = dev->subordinate;
 590                 if (!b)
 591                         continue;
 592
 593                 pci_bus_dump_resources(b);
 594         }
 595 }
 596
 597 void __init
 598 pci_assign_unassigned_resources(void)
 599 {
 600         struct pci_bus *bus;
 601
 602         /* Depth first, calculate sizes and alignments of all
 603            subordinate buses. */
 604         list_for_each_entry(bus, &pci_root_buses, node) {
 605                 pci_bus_size_bridges(bus);
 606         }
 607         /* Depth last, allocate resources and update the hardware. */
 608         list_for_each_entry(bus, &pci_root_buses, node) {
 609                 pci_bus_assign_resources(bus);
 610                 pci_enable_bridges(bus);
 611         }
 612
 613         /* dump the resource on buses */
 614         list_for_each_entry(bus, &pci_root_buses, node) {
 615                 pci_bus_dump_resources(bus);
 616         }
 617 }