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 #include "pci.h"
  29
  30 struct resource_list_x {
  31         struct resource_list_x *next;
  32         struct resource *res;
  33         struct pci_dev *dev;
  34         resource_size_t start;
  35         resource_size_t end;
  36         unsigned long flags;
  37 };
  38
  39 static void add_to_failed_list(struct resource_list_x *head,
  40                                  struct pci_dev *dev, struct resource *res)
  41 {
  42         struct resource_list_x *list = head;
  43         struct resource_list_x *ln = list->next;
  44         struct resource_list_x *tmp;
  45
  46         tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
  47         if (!tmp) {
  48                 pr_warning("add_to_failed_list: kmalloc() failed!\n");
  49                 return;
  50         }
  51
  52         tmp->next = ln;
  53         tmp->res = res;
  54         tmp->dev = dev;
  55         tmp->start = res->start;
  56         tmp->end = res->end;
  57         tmp->flags = res->flags;
  58         list->next = tmp;
  59 }
  60
  61 static void free_failed_list(struct resource_list_x *head)
  62 {
  63         struct resource_list_x *list, *tmp;
  64
  65         for (list = head->next; list;) {
  66                 tmp = list;
  67                 list = list->next;
  68                 kfree(tmp);
  69         }
  70
  71         head->next = NULL;
  72 }
  73
  74 static void __dev_sort_resources(struct pci_dev *dev,
  75                                  struct resource_list *head)
  76 {
  77         u16 class = dev->class >> 8;
  78
  79         /* Don't touch classless devices or host bridges or ioapics.  */
  80         if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
  81                 return;
  82
  83         /* Don't touch ioapic devices already enabled by firmware */
  84         if (class == PCI_CLASS_SYSTEM_PIC) {
  85                 u16 command;
  86                 pci_read_config_word(dev, PCI_COMMAND, &command);
  87                 if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
  88                         return;
  89         }
  90
  91         pdev_sort_resources(dev, head);
  92 }
  93
  94 static void __assign_resources_sorted(struct resource_list *head,
  95                                  struct resource_list_x *fail_head)
  96 {
  97         struct resource *res;
  98         struct resource_list *list, *tmp;
  99         int idx;
 100
 101         for (list = head->next; list;) {
 102                 res = list->res;
 103                 idx = res - &list->dev->resource[0];
 104
 105                 if (pci_assign_resource(list->dev, idx)) {
 106                         if (fail_head && !pci_is_root_bus(list->dev->bus)) {
 107                                 /*
 108                                  * if the failed res is for ROM BAR, and it will
 109                                  * be enabled later, don't add it to the list
 110                                  */
 111                                 if (!((idx == PCI_ROM_RESOURCE) &&
 112                                       (!(res->flags & IORESOURCE_ROM_ENABLE))))
 113                                         add_to_failed_list(fail_head, list->dev, res);
 114                         }
 115                         res->start = 0;
 116                         res->end = 0;
 117                         res->flags = 0;
 118                 }
 119                 tmp = list;
 120                 list = list->next;
 121                 kfree(tmp);
 122         }
 123 }
 124
 125 static void pdev_assign_resources_sorted(struct pci_dev *dev,
 126                                  struct resource_list_x *fail_head)
 127 {
 128         struct resource_list head;
 129
 130         head.next = NULL;
 131         __dev_sort_resources(dev, &head);
 132         __assign_resources_sorted(&head, fail_head);
 133
 134 }
 135
 136 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
 137                                          struct resource_list_x *fail_head)
 138 {
 139         struct pci_dev *dev;
 140         struct resource_list head;
 141
 142         head.next = NULL;
 143         list_for_each_entry(dev, &bus->devices, bus_list)
 144                 __dev_sort_resources(dev, &head);
 145
 146         __assign_resources_sorted(&head, fail_head);
 147 }
 148
 149 void pci_setup_cardbus(struct pci_bus *bus)
 150 {
 151         struct pci_dev *bridge = bus->self;
 152         struct resource *res;
 153         struct pci_bus_region region;
 154
 155         dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n",
 156                  bus->secondary, bus->subordinate);
 157
 158         res = bus->resource[0];
 159         pcibios_resource_to_bus(bridge, &region, res);
 160         if (res->flags & IORESOURCE_IO) {
 161                 /*
 162                  * The IO resource is allocated a range twice as large as it
 163                  * would normally need.  This allows us to set both IO regs.
 164                  */
 165                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 166                 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
 167                                         region.start);
 168                 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
 169                                         region.end);
 170         }
 171
 172         res = bus->resource[1];
 173         pcibios_resource_to_bus(bridge, &region, res);
 174         if (res->flags & IORESOURCE_IO) {
 175                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 176                 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
 177                                         region.start);
 178                 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
 179                                         region.end);
 180         }
 181
 182         res = bus->resource[2];
 183         pcibios_resource_to_bus(bridge, &region, res);
 184         if (res->flags & IORESOURCE_MEM) {
 185                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 186                 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
 187                                         region.start);
 188                 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
 189                                         region.end);
 190         }
 191
 192         res = bus->resource[3];
 193         pcibios_resource_to_bus(bridge, &region, res);
 194         if (res->flags & IORESOURCE_MEM) {
 195                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 196                 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
 197                                         region.start);
 198                 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
 199                                         region.end);
 200         }
 201 }
 202 EXPORT_SYMBOL(pci_setup_cardbus);
 203
 204 /* Initialize bridges with base/limit values we have collected.
 205    PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
 206    requires that if there is no I/O ports or memory behind the
 207    bridge, corresponding range must be turned off by writing base
 208    value greater than limit to the bridge's base/limit registers.
 209
 210    Note: care must be taken when updating I/O base/limit registers
 211    of bridges which support 32-bit I/O. This update requires two
 212    config space writes, so it's quite possible that an I/O window of
 213    the bridge will have some undesirable address (e.g. 0) after the
 214    first write. Ditto 64-bit prefetchable MMIO.  */
 215 static void pci_setup_bridge_io(struct pci_bus *bus)
 216 {
 217         struct pci_dev *bridge = bus->self;
 218         struct resource *res;
 219         struct pci_bus_region region;
 220         u32 l, io_upper16;
 221
 222         /* Set up the top and bottom of the PCI I/O segment for this bus. */
 223         res = bus->resource[0];
 224         pcibios_resource_to_bus(bridge, &region, res);
 225         if (res->flags & IORESOURCE_IO) {
 226                 pci_read_config_dword(bridge, PCI_IO_BASE, &l);
 227                 l &= 0xffff0000;
 228                 l |= (region.start >> 8) & 0x00f0;
 229                 l |= region.end & 0xf000;
 230                 /* Set up upper 16 bits of I/O base/limit. */
 231                 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
 232                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 233         } else {
 234                 /* Clear upper 16 bits of I/O base/limit. */
 235                 io_upper16 = 0;
 236                 l = 0x00f0;
 237                 dev_info(&bridge->dev, "  bridge window [io  disabled]\n");
 238         }
 239         /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
 240         pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
 241         /* Update lower 16 bits of I/O base/limit. */
 242         pci_write_config_dword(bridge, PCI_IO_BASE, l);
 243         /* Update upper 16 bits of I/O base/limit. */
 244         pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
 245 }
 246
 247 static void pci_setup_bridge_mmio(struct pci_bus *bus)
 248 {
 249         struct pci_dev *bridge = bus->self;
 250         struct resource *res;
 251         struct pci_bus_region region;
 252         u32 l;
 253
 254         /* Set up the top and bottom of the PCI Memory segment for this bus. */
 255         res = bus->resource[1];
 256         pcibios_resource_to_bus(bridge, &region, res);
 257         if (res->flags & IORESOURCE_MEM) {
 258                 l = (region.start >> 16) & 0xfff0;
 259                 l |= region.end & 0xfff00000;
 260                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 261         } else {
 262                 l = 0x0000fff0;
 263                 dev_info(&bridge->dev, "  bridge window [mem disabled]\n");
 264         }
 265         pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
 266 }
 267
 268 static void pci_setup_bridge_mmio_pref(struct pci_bus *bus)
 269 {
 270         struct pci_dev *bridge = bus->self;
 271         struct resource *res;
 272         struct pci_bus_region region;
 273         u32 l, bu, lu;
 274
 275         /* Clear out the upper 32 bits of PREF limit.
 276            If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
 277            disables PREF range, which is ok. */
 278         pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
 279
 280         /* Set up PREF base/limit. */
 281         bu = lu = 0;
 282         res = bus->resource[2];
 283         pcibios_resource_to_bus(bridge, &region, res);
 284         if (res->flags & IORESOURCE_PREFETCH) {
 285                 l = (region.start >> 16) & 0xfff0;
 286                 l |= region.end & 0xfff00000;
 287                 if (res->flags & IORESOURCE_MEM_64) {
 288                         bu = upper_32_bits(region.start);
 289                         lu = upper_32_bits(region.end);
 290                 }
 291                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
 292         } else {
 293                 l = 0x0000fff0;
 294                 dev_info(&bridge->dev, "  bridge window [mem pref disabled]\n");
 295         }
 296         pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
 297
 298         /* Set the upper 32 bits of PREF base & limit. */
 299         pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
 300         pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
 301 }
 302
 303 static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
 304 {
 305         struct pci_dev *bridge = bus->self;
 306
 307         dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
 308                  bus->secondary, bus->subordinate);
 309
 310         if (type & IORESOURCE_IO)
 311                 pci_setup_bridge_io(bus);
 312
 313         if (type & IORESOURCE_MEM)
 314                 pci_setup_bridge_mmio(bus);
 315
 316         if (type & IORESOURCE_PREFETCH)
 317                 pci_setup_bridge_mmio_pref(bus);
 318
 319         pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
 320 }
 321
 322 static void pci_setup_bridge(struct pci_bus *bus)
 323 {
 324         unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
 325                                   IORESOURCE_PREFETCH;
 326
 327         __pci_setup_bridge(bus, type);
 328 }
 329
 330 /* Check whether the bridge supports optional I/O and
 331    prefetchable memory ranges. If not, the respective
 332    base/limit registers must be read-only and read as 0. */
 333 static void pci_bridge_check_ranges(struct pci_bus *bus)
 334 {
 335         u16 io;
 336         u32 pmem;
 337         struct pci_dev *bridge = bus->self;
 338         struct resource *b_res;
 339
 340         b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
 341         b_res[1].flags |= IORESOURCE_MEM;
 342
 343         pci_read_config_word(bridge, PCI_IO_BASE, &io);
 344         if (!io) {
 345                 pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0);
 346                 pci_read_config_word(bridge, PCI_IO_BASE, &io);
 347                 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
 348         }
 349         if (io)
 350                 b_res[0].flags |= IORESOURCE_IO;
 351         /*  DECchip 21050 pass 2 errata: the bridge may miss an address
 352             disconnect boundary by one PCI data phase.
 353             Workaround: do not use prefetching on this device. */
 354         if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
 355                 return;
 356         pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 357         if (!pmem) {
 358                 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
 359                                                0xfff0fff0);
 360                 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 361                 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
 362         }
 363         if (pmem) {
 364                 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
 365                 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
 366                     PCI_PREF_RANGE_TYPE_64) {
 367                         b_res[2].flags |= IORESOURCE_MEM_64;
 368                         b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
 369                 }
 370         }
 371
 372         /* double check if bridge does support 64 bit pref */
 373         if (b_res[2].flags & IORESOURCE_MEM_64) {
 374                 u32 mem_base_hi, tmp;
 375                 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 376                                          &mem_base_hi);
 377                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 378                                                0xffffffff);
 379                 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
 380                 if (!tmp)
 381                         b_res[2].flags &= ~IORESOURCE_MEM_64;
 382                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 383                                        mem_base_hi);
 384         }
 385 }
 386
 387 /* Helper function for sizing routines: find first available
 388    bus resource of a given type. Note: we intentionally skip
 389    the bus resources which have already been assigned (that is,
 390    have non-NULL parent resource). */
 391 static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
 392 {
 393         int i;
 394         struct resource *r;
 395         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
 396                                   IORESOURCE_PREFETCH;
 397
 398         pci_bus_for_each_resource(bus, r, i) {
 399                 if (r == &ioport_resource || r == &iomem_resource)
 400                         continue;
 401                 if (r && (r->flags & type_mask) == type && !r->parent)
 402                         return r;
 403         }
 404         return NULL;
 405 }
 406
 407 /* Sizing the IO windows of the PCI-PCI bridge is trivial,
 408    since these windows have 4K granularity and the IO ranges
 409    of non-bridge PCI devices are limited to 256 bytes.
 410    We must be careful with the ISA aliasing though. */
 411 static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
 412 {
 413         struct pci_dev *dev;
 414         struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
 415         unsigned long size = 0, size1 = 0, old_size;
 416
 417         if (!b_res)
 418                 return;
 419
 420         list_for_each_entry(dev, &bus->devices, bus_list) {
 421                 int i;
 422
 423                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 424                         struct resource *r = &dev->resource[i];
 425                         unsigned long r_size;
 426
 427                         if (r->parent || !(r->flags & IORESOURCE_IO))
 428                                 continue;
 429                         r_size = resource_size(r);
 430
 431                         if (r_size < 0x400)
 432                                 /* Might be re-aligned for ISA */
 433                                 size += r_size;
 434                         else
 435                                 size1 += r_size;
 436                 }
 437         }
 438         if (size < min_size)
 439                 size = min_size;
 440         old_size = resource_size(b_res);
 441         if (old_size == 1)
 442                 old_size = 0;
 443 /* To be fixed in 2.5: we should have sort of HAVE_ISA
 444    flag in the struct pci_bus. */
 445 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
 446         size = (size & 0xff) + ((size & ~0xffUL) << 2);
 447 #endif
 448         size = ALIGN(size + size1, 4096);
 449         if (size < old_size)
 450                 size = old_size;
 451         if (!size) {
 452                 if (b_res->start || b_res->end)
 453                         dev_info(&bus->self->dev, "disabling bridge window "
 454                                  "%pR to [bus %02x-%02x] (unused)\n", b_res,
 455                                  bus->secondary, bus->subordinate);
 456                 b_res->flags = 0;
 457                 return;
 458         }
 459         /* Alignment of the IO window is always 4K */
 460         b_res->start = 4096;
 461         b_res->end = b_res->start + size - 1;
 462         b_res->flags |= IORESOURCE_STARTALIGN;
 463 }
 464
 465 /* Calculate the size of the bus and minimal alignment which
 466    guarantees that all child resources fit in this size. */
 467 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 468                          unsigned long type, resource_size_t min_size)
 469 {
 470         struct pci_dev *dev;
 471         resource_size_t min_align, align, size, old_size;
 472         resource_size_t aligns[12];     /* Alignments from 1Mb to 2Gb */
 473         int order, max_order;
 474         struct resource *b_res = find_free_bus_resource(bus, type);
 475         unsigned int mem64_mask = 0;
 476
 477         if (!b_res)
 478                 return 0;
 479
 480         memset(aligns, 0, sizeof(aligns));
 481         max_order = 0;
 482         size = 0;
 483
 484         mem64_mask = b_res->flags & IORESOURCE_MEM_64;
 485         b_res->flags &= ~IORESOURCE_MEM_64;
 486
 487         list_for_each_entry(dev, &bus->devices, bus_list) {
 488                 int i;
 489
 490                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 491                         struct resource *r = &dev->resource[i];
 492                         resource_size_t r_size;
 493
 494                         if (r->parent || (r->flags & mask) != type)
 495                                 continue;
 496                         r_size = resource_size(r);
 497                         /* For bridges size != alignment */
 498                         align = pci_resource_alignment(dev, r);
 499                         order = __ffs(align) - 20;
 500                         if (order > 11) {
 501                                 dev_warn(&dev->dev, "disabling BAR %d: %pR "
 502                                          "(bad alignment %#llx)\n", i, r,
 503                                          (unsigned long long) align);
 504                                 r->flags = 0;
 505                                 continue;
 506                         }
 507                         size += r_size;
 508                         if (order < 0)
 509                                 order = 0;
 510                         /* Exclude ranges with size > align from
 511                            calculation of the alignment. */
 512                         if (r_size == align)
 513                                 aligns[order] += align;
 514                         if (order > max_order)
 515                                 max_order = order;
 516                         mem64_mask &= r->flags & IORESOURCE_MEM_64;
 517                 }
 518         }
 519         if (size < min_size)
 520                 size = min_size;
 521         old_size = resource_size(b_res);
 522         if (old_size == 1)
 523                 old_size = 0;
 524         if (size < old_size)
 525                 size = old_size;
 526
 527         align = 0;
 528         min_align = 0;
 529         for (order = 0; order <= max_order; order++) {
 530                 resource_size_t align1 = 1;
 531
 532                 align1 <<= (order + 20);
 533
 534                 if (!align)
 535                         min_align = align1;
 536                 else if (ALIGN(align + min_align, min_align) < align1)
 537                         min_align = align1 >> 1;
 538                 align += aligns[order];
 539         }
 540         size = ALIGN(size, min_align);
 541         if (!size) {
 542                 if (b_res->start || b_res->end)
 543                         dev_info(&bus->self->dev, "disabling bridge window "
 544                                  "%pR to [bus %02x-%02x] (unused)\n", b_res,
 545                                  bus->secondary, bus->subordinate);
 546                 b_res->flags = 0;
 547                 return 1;
 548         }
 549         b_res->start = min_align;
 550         b_res->end = size + min_align - 1;
 551         b_res->flags |= IORESOURCE_STARTALIGN;
 552         b_res->flags |= mem64_mask;
 553         return 1;
 554 }
 555
 556 static void pci_bus_size_cardbus(struct pci_bus *bus)
 557 {
 558         struct pci_dev *bridge = bus->self;
 559         struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
 560         u16 ctrl;
 561
 562         /*
 563          * Reserve some resources for CardBus.  We reserve
 564          * a fixed amount of bus space for CardBus bridges.
 565          */
 566         b_res[0].start = 0;
 567         b_res[0].end = pci_cardbus_io_size - 1;
 568         b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 569
 570         b_res[1].start = 0;
 571         b_res[1].end = pci_cardbus_io_size - 1;
 572         b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 573
 574         /*
 575          * Check whether prefetchable memory is supported
 576          * by this bridge.
 577          */
 578         pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
 579         if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
 580                 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
 581                 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
 582                 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
 583         }
 584
 585         /*
 586          * If we have prefetchable memory support, allocate
 587          * two regions.  Otherwise, allocate one region of
 588          * twice the size.
 589          */
 590         if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
 591                 b_res[2].start = 0;
 592                 b_res[2].end = pci_cardbus_mem_size - 1;
 593                 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
 594
 595                 b_res[3].start = 0;
 596                 b_res[3].end = pci_cardbus_mem_size - 1;
 597                 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 598         } else {
 599                 b_res[3].start = 0;
 600                 b_res[3].end = pci_cardbus_mem_size * 2 - 1;
 601                 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 602         }
 603 }
 604
 605 void __ref pci_bus_size_bridges(struct pci_bus *bus)
 606 {
 607         struct pci_dev *dev;
 608         unsigned long mask, prefmask;
 609         resource_size_t min_mem_size = 0, min_io_size = 0;
 610
 611         list_for_each_entry(dev, &bus->devices, bus_list) {
 612                 struct pci_bus *b = dev->subordinate;
 613                 if (!b)
 614                         continue;
 615
 616                 switch (dev->class >> 8) {
 617                 case PCI_CLASS_BRIDGE_CARDBUS:
 618                         pci_bus_size_cardbus(b);
 619                         break;
 620
 621                 case PCI_CLASS_BRIDGE_PCI:
 622                 default:
 623                         pci_bus_size_bridges(b);
 624                         break;
 625                 }
 626         }
 627
 628         /* The root bus? */
 629         if (!bus->self)
 630                 return;
 631
 632         switch (bus->self->class >> 8) {
 633         case PCI_CLASS_BRIDGE_CARDBUS:
 634                 /* don't size cardbuses yet. */
 635                 break;
 636
 637         case PCI_CLASS_BRIDGE_PCI:
 638                 pci_bridge_check_ranges(bus);
 639                 if (bus->self->is_hotplug_bridge) {
 640                         min_io_size  = pci_hotplug_io_size;
 641                         min_mem_size = pci_hotplug_mem_size;
 642                 }
 643         default:
 644                 pbus_size_io(bus, min_io_size);
 645                 /* If the bridge supports prefetchable range, size it
 646                    separately. If it doesn't, or its prefetchable window
 647                    has already been allocated by arch code, try
 648                    non-prefetchable range for both types of PCI memory
 649                    resources. */
 650                 mask = IORESOURCE_MEM;
 651                 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 652                 if (pbus_size_mem(bus, prefmask, prefmask, min_mem_size))
 653                         mask = prefmask; /* Success, size non-prefetch only. */
 654                 else
 655                         min_mem_size += min_mem_size;
 656                 pbus_size_mem(bus, mask, IORESOURCE_MEM, min_mem_size);
 657                 break;
 658         }
 659 }
 660 EXPORT_SYMBOL(pci_bus_size_bridges);
 661
 662 static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
 663                                          struct resource_list_x *fail_head)
 664 {
 665         struct pci_bus *b;
 666         struct pci_dev *dev;
 667
 668         pbus_assign_resources_sorted(bus, fail_head);
 669
 670         list_for_each_entry(dev, &bus->devices, bus_list) {
 671                 b = dev->subordinate;
 672                 if (!b)
 673                         continue;
 674
 675                 __pci_bus_assign_resources(b, fail_head);
 676
 677                 switch (dev->class >> 8) {
 678                 case PCI_CLASS_BRIDGE_PCI:
 679                         if (!pci_is_enabled(dev))
 680                                 pci_setup_bridge(b);
 681                         break;
 682
 683                 case PCI_CLASS_BRIDGE_CARDBUS:
 684                         pci_setup_cardbus(b);
 685                         break;
 686
 687                 default:
 688                         dev_info(&dev->dev, "not setting up bridge for bus "
 689                                  "%04x:%02x\n", pci_domain_nr(b), b->number);
 690                         break;
 691                 }
 692         }
 693 }
 694
 695 void __ref pci_bus_assign_resources(const struct pci_bus *bus)
 696 {
 697         __pci_bus_assign_resources(bus, NULL);
 698 }
 699 EXPORT_SYMBOL(pci_bus_assign_resources);
 700
 701 static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
 702                                          struct resource_list_x *fail_head)
 703 {
 704         struct pci_bus *b;
 705
 706         pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head);
 707
 708         b = bridge->subordinate;
 709         if (!b)
 710                 return;
 711
 712         __pci_bus_assign_resources(b, fail_head);
 713
 714         switch (bridge->class >> 8) {
 715         case PCI_CLASS_BRIDGE_PCI:
 716                 pci_setup_bridge(b);
 717                 break;
 718
 719         case PCI_CLASS_BRIDGE_CARDBUS:
 720                 pci_setup_cardbus(b);
 721                 break;
 722
 723         default:
 724                 dev_info(&bridge->dev, "not setting up bridge for bus "
 725                          "%04x:%02x\n", pci_domain_nr(b), b->number);
 726                 break;
 727         }
 728 }
 729 static void pci_bridge_release_resources(struct pci_bus *bus,
 730                                           unsigned long type)
 731 {
 732         int idx;
 733         bool changed = false;
 734         struct pci_dev *dev;
 735         struct resource *r;
 736         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
 737                                   IORESOURCE_PREFETCH;
 738
 739         dev = bus->self;
 740         for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
 741              idx++) {
 742                 r = &dev->resource[idx];
 743                 if ((r->flags & type_mask) != type)
 744                         continue;
 745                 if (!r->parent)
 746                         continue;
 747                 /*
 748                  * if there are children under that, we should release them
 749                  *  all
 750                  */
 751                 release_child_resources(r);
 752                 if (!release_resource(r)) {
 753                         dev_printk(KERN_DEBUG, &dev->dev,
 754                                  "resource %d %pR released\n", idx, r);
 755                         /* keep the old size */
 756                         r->end = resource_size(r) - 1;
 757                         r->start = 0;
 758                         r->flags = 0;
 759                         changed = true;
 760                 }
 761         }
 762
 763         if (changed) {
 764                 /* avoiding touch the one without PREF */
 765                 if (type & IORESOURCE_PREFETCH)
 766                         type = IORESOURCE_PREFETCH;
 767                 __pci_setup_bridge(bus, type);
 768         }
 769 }
 770
 771 enum release_type {
 772         leaf_only,
 773         whole_subtree,
 774 };
 775 /*
 776  * try to release pci bridge resources that is from leaf bridge,
 777  * so we can allocate big new one later
 778  */
 779 static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
 780                                                    unsigned long type,
 781                                                    enum release_type rel_type)
 782 {
 783         struct pci_dev *dev;
 784         bool is_leaf_bridge = true;
 785
 786         list_for_each_entry(dev, &bus->devices, bus_list) {
 787                 struct pci_bus *b = dev->subordinate;
 788                 if (!b)
 789                         continue;
 790
 791                 is_leaf_bridge = false;
 792
 793                 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 794                         continue;
 795
 796                 if (rel_type == whole_subtree)
 797                         pci_bus_release_bridge_resources(b, type,
 798                                                  whole_subtree);
 799         }
 800
 801         if (pci_is_root_bus(bus))
 802                 return;
 803
 804         if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 805                 return;
 806
 807         if ((rel_type == whole_subtree) || is_leaf_bridge)
 808                 pci_bridge_release_resources(bus, type);
 809 }
 810
 811 static void pci_bus_dump_res(struct pci_bus *bus)
 812 {
 813         struct resource *res;
 814         int i;
 815
 816         pci_bus_for_each_resource(bus, res, i) {
 817                 if (!res || !res->end || !res->flags)
 818                         continue;
 819
 820                 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
 821         }
 822 }
 823
 824 static void pci_bus_dump_resources(struct pci_bus *bus)
 825 {
 826         struct pci_bus *b;
 827         struct pci_dev *dev;
 828
 829
 830         pci_bus_dump_res(bus);
 831
 832         list_for_each_entry(dev, &bus->devices, bus_list) {
 833                 b = dev->subordinate;
 834                 if (!b)
 835                         continue;
 836
 837                 pci_bus_dump_resources(b);
 838         }
 839 }
 840
 841 void __init
 842 pci_assign_unassigned_resources(void)
 843 {
 844         struct pci_bus *bus;
 845
 846         /* Depth first, calculate sizes and alignments of all
 847            subordinate buses. */
 848         list_for_each_entry(bus, &pci_root_buses, node) {
 849                 pci_bus_size_bridges(bus);
 850         }
 851         /* Depth last, allocate resources and update the hardware. */
 852         list_for_each_entry(bus, &pci_root_buses, node) {
 853                 pci_bus_assign_resources(bus);
 854                 pci_enable_bridges(bus);
 855         }
 856
 857         /* dump the resource on buses */
 858         list_for_each_entry(bus, &pci_root_buses, node) {
 859                 pci_bus_dump_resources(bus);
 860         }
 861 }
 862
 863 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
 864 {
 865         struct pci_bus *parent = bridge->subordinate;
 866         int tried_times = 0;
 867         struct resource_list_x head, *list;
 868         int retval;
 869         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
 870                                   IORESOURCE_PREFETCH;
 871
 872         head.next = NULL;
 873
 874 again:
 875         pci_bus_size_bridges(parent);
 876         __pci_bridge_assign_resources(bridge, &head);
 877         retval = pci_reenable_device(bridge);
 878         pci_set_master(bridge);
 879         pci_enable_bridges(parent);
 880
 881         tried_times++;
 882
 883         if (!head.next)
 884                 return;
 885
 886         if (tried_times >= 2) {
 887                 /* still fail, don't need to try more */
 888                 free_failed_list(&head);
 889                 return;
 890         }
 891
 892         printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
 893                          tried_times + 1);
 894
 895         /*
 896          * Try to release leaf bridge's resources that doesn't fit resource of
 897          * child device under that bridge
 898          */
 899         for (list = head.next; list;) {
 900                 struct pci_bus *bus = list->dev->bus;
 901                 unsigned long flags = list->flags;
 902
 903                 pci_bus_release_bridge_resources(bus, flags & type_mask,
 904                                                  whole_subtree);
 905                 list = list->next;
 906         }
 907         /* restore size and flags */
 908         for (list = head.next; list;) {
 909                 struct resource *res = list->res;
 910
 911                 res->start = list->start;
 912                 res->end = list->end;
 913                 res->flags = list->flags;
 914                 if (list->dev->subordinate)
 915                         res->flags = 0;
 916
 917                 list = list->next;
 918         }
 919         free_failed_list(&head);
 920
 921         goto again;
 922 }
 923 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);