1 /* 2 * probe.c - PCI detection and setup code 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/delay.h> 7 #include <linux/init.h> 8 #include <linux/pci.h> 9 #include <linux/pci_hotplug.h> 10 #include <linux/slab.h> 11 #include <linux/module.h> 12 #include <linux/cpumask.h> 13 #include <linux/pci-aspm.h> 14 #include <asm-generic/pci-bridge.h> 15 #include "pci.h" 16 17 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ 18 #define CARDBUS_RESERVE_BUSNR 3 19 20 static struct resource busn_resource = { 21 .name = "PCI busn", 22 .start = 0, 23 .end = 255, 24 .flags = IORESOURCE_BUS, 25 }; 26 27 /* Ugh. Need to stop exporting this to modules. */ 28 LIST_HEAD(pci_root_buses); 29 EXPORT_SYMBOL(pci_root_buses); 30 31 static LIST_HEAD(pci_domain_busn_res_list); 32 33 struct pci_domain_busn_res { 34 struct list_head list; 35 struct resource res; 36 int domain_nr; 37 }; 38 39 static struct resource *get_pci_domain_busn_res(int domain_nr) 40 { 41 struct pci_domain_busn_res *r; 42 43 list_for_each_entry(r, &pci_domain_busn_res_list, list) 44 if (r->domain_nr == domain_nr) 45 return &r->res; 46 47 r = kzalloc(sizeof(*r), GFP_KERNEL); 48 if (!r) 49 return NULL; 50 51 r->domain_nr = domain_nr; 52 r->res.start = 0; 53 r->res.end = 0xff; 54 r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED; 55 56 list_add_tail(&r->list, &pci_domain_busn_res_list); 57 58 return &r->res; 59 } 60 61 static int find_anything(struct device *dev, void *data) 62 { 63 return 1; 64 } 65 66 /* 67 * Some device drivers need know if pci is initiated. 68 * Basically, we think pci is not initiated when there 69 * is no device to be found on the pci_bus_type. 70 */ 71 int no_pci_devices(void) 72 { 73 struct device *dev; 74 int no_devices; 75 76 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); 77 no_devices = (dev == NULL); 78 put_device(dev); 79 return no_devices; 80 } 81 EXPORT_SYMBOL(no_pci_devices); 82 83 /* 84 * PCI Bus Class 85 */ 86 static void release_pcibus_dev(struct device *dev) 87 { 88 struct pci_bus *pci_bus = to_pci_bus(dev); 89 90 put_device(pci_bus->bridge); 91 pci_bus_remove_resources(pci_bus); 92 pci_release_bus_of_node(pci_bus); 93 kfree(pci_bus); 94 } 95 96 static struct class pcibus_class = { 97 .name = "pci_bus", 98 .dev_release = &release_pcibus_dev, 99 .dev_groups = pcibus_groups, 100 }; 101 102 static int __init pcibus_class_init(void) 103 { 104 return class_register(&pcibus_class); 105 } 106 postcore_initcall(pcibus_class_init); 107 108 static u64 pci_size(u64 base, u64 maxbase, u64 mask) 109 { 110 u64 size = mask & maxbase; /* Find the significant bits */ 111 if (!size) 112 return 0; 113 114 /* Get the lowest of them to find the decode size, and 115 from that the extent. */ 116 size = (size & ~(size-1)) - 1; 117 118 /* base == maxbase can be valid only if the BAR has 119 already been programmed with all 1s. */ 120 if (base == maxbase && ((base | size) & mask) != mask) 121 return 0; 122 123 return size; 124 } 125 126 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar) 127 { 128 u32 mem_type; 129 unsigned long flags; 130 131 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { 132 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; 133 flags |= IORESOURCE_IO; 134 return flags; 135 } 136 137 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; 138 flags |= IORESOURCE_MEM; 139 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) 140 flags |= IORESOURCE_PREFETCH; 141 142 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK; 143 switch (mem_type) { 144 case PCI_BASE_ADDRESS_MEM_TYPE_32: 145 break; 146 case PCI_BASE_ADDRESS_MEM_TYPE_1M: 147 /* 1M mem BAR treated as 32-bit BAR */ 148 break; 149 case PCI_BASE_ADDRESS_MEM_TYPE_64: 150 flags |= IORESOURCE_MEM_64; 151 break; 152 default: 153 /* mem unknown type treated as 32-bit BAR */ 154 break; 155 } 156 return flags; 157 } 158 159 #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO) 160 161 /** 162 * pci_read_base - read a PCI BAR 163 * @dev: the PCI device 164 * @type: type of the BAR 165 * @res: resource buffer to be filled in 166 * @pos: BAR position in the config space 167 * 168 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. 169 */ 170 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, 171 struct resource *res, unsigned int pos) 172 { 173 u32 l, sz, mask; 174 u64 l64, sz64, mask64; 175 u16 orig_cmd; 176 struct pci_bus_region region, inverted_region; 177 178 mask = type ? PCI_ROM_ADDRESS_MASK : ~0; 179 180 /* No printks while decoding is disabled! */ 181 if (!dev->mmio_always_on) { 182 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); 183 if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) { 184 pci_write_config_word(dev, PCI_COMMAND, 185 orig_cmd & ~PCI_COMMAND_DECODE_ENABLE); 186 } 187 } 188 189 res->name = pci_name(dev); 190 191 pci_read_config_dword(dev, pos, &l); 192 pci_write_config_dword(dev, pos, l | mask); 193 pci_read_config_dword(dev, pos, &sz); 194 pci_write_config_dword(dev, pos, l); 195 196 /* 197 * All bits set in sz means the device isn't working properly. 198 * If the BAR isn't implemented, all bits must be 0. If it's a 199 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit 200 * 1 must be clear. 201 */ 202 if (sz == 0xffffffff) 203 sz = 0; 204 205 /* 206 * I don't know how l can have all bits set. Copied from old code. 207 * Maybe it fixes a bug on some ancient platform. 208 */ 209 if (l == 0xffffffff) 210 l = 0; 211 212 if (type == pci_bar_unknown) { 213 res->flags = decode_bar(dev, l); 214 res->flags |= IORESOURCE_SIZEALIGN; 215 if (res->flags & IORESOURCE_IO) { 216 l64 = l & PCI_BASE_ADDRESS_IO_MASK; 217 sz64 = sz & PCI_BASE_ADDRESS_IO_MASK; 218 mask64 = PCI_BASE_ADDRESS_IO_MASK & (u32)IO_SPACE_LIMIT; 219 } else { 220 l64 = l & PCI_BASE_ADDRESS_MEM_MASK; 221 sz64 = sz & PCI_BASE_ADDRESS_MEM_MASK; 222 mask64 = (u32)PCI_BASE_ADDRESS_MEM_MASK; 223 } 224 } else { 225 res->flags |= (l & IORESOURCE_ROM_ENABLE); 226 l64 = l & PCI_ROM_ADDRESS_MASK; 227 sz64 = sz & PCI_ROM_ADDRESS_MASK; 228 mask64 = (u32)PCI_ROM_ADDRESS_MASK; 229 } 230 231 if (res->flags & IORESOURCE_MEM_64) { 232 pci_read_config_dword(dev, pos + 4, &l); 233 pci_write_config_dword(dev, pos + 4, ~0); 234 pci_read_config_dword(dev, pos + 4, &sz); 235 pci_write_config_dword(dev, pos + 4, l); 236 237 l64 |= ((u64)l << 32); 238 sz64 |= ((u64)sz << 32); 239 mask64 |= ((u64)~0 << 32); 240 } 241 242 if (!dev->mmio_always_on && (orig_cmd & PCI_COMMAND_DECODE_ENABLE)) 243 pci_write_config_word(dev, PCI_COMMAND, orig_cmd); 244 245 if (!sz64) 246 goto fail; 247 248 sz64 = pci_size(l64, sz64, mask64); 249 if (!sz64) { 250 dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n", 251 pos); 252 goto fail; 253 } 254 255 if (res->flags & IORESOURCE_MEM_64) { 256 if ((sizeof(dma_addr_t) < 8 || sizeof(resource_size_t) < 8) && 257 sz64 > 0x100000000ULL) { 258 res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED; 259 res->start = 0; 260 res->end = 0; 261 dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n", 262 pos, (unsigned long long)sz64); 263 goto out; 264 } 265 266 if ((sizeof(dma_addr_t) < 8) && l) { 267 /* Above 32-bit boundary; try to reallocate */ 268 res->flags |= IORESOURCE_UNSET; 269 res->start = 0; 270 res->end = sz64; 271 dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n", 272 pos, (unsigned long long)l64); 273 goto out; 274 } 275 } 276 277 region.start = l64; 278 region.end = l64 + sz64; 279 280 pcibios_bus_to_resource(dev->bus, res, ®ion); 281 pcibios_resource_to_bus(dev->bus, &inverted_region, res); 282 283 /* 284 * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is 285 * the corresponding resource address (the physical address used by 286 * the CPU. Converting that resource address back to a bus address 287 * should yield the original BAR value: 288 * 289 * resource_to_bus(bus_to_resource(A)) == A 290 * 291 * If it doesn't, CPU accesses to "bus_to_resource(A)" will not 292 * be claimed by the device. 293 */ 294 if (inverted_region.start != region.start) { 295 res->flags |= IORESOURCE_UNSET; 296 res->start = 0; 297 res->end = region.end - region.start; 298 dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n", 299 pos, (unsigned long long)region.start); 300 } 301 302 goto out; 303 304 305 fail: 306 res->flags = 0; 307 out: 308 if (res->flags) 309 dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res); 310 311 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; 312 } 313 314 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) 315 { 316 unsigned int pos, reg; 317 318 for (pos = 0; pos < howmany; pos++) { 319 struct resource *res = &dev->resource[pos]; 320 reg = PCI_BASE_ADDRESS_0 + (pos << 2); 321 pos += __pci_read_base(dev, pci_bar_unknown, res, reg); 322 } 323 324 if (rom) { 325 struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; 326 dev->rom_base_reg = rom; 327 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | 328 IORESOURCE_READONLY | IORESOURCE_CACHEABLE | 329 IORESOURCE_SIZEALIGN; 330 __pci_read_base(dev, pci_bar_mem32, res, rom); 331 } 332 } 333 334 static void pci_read_bridge_io(struct pci_bus *child) 335 { 336 struct pci_dev *dev = child->self; 337 u8 io_base_lo, io_limit_lo; 338 unsigned long io_mask, io_granularity, base, limit; 339 struct pci_bus_region region; 340 struct resource *res; 341 342 io_mask = PCI_IO_RANGE_MASK; 343 io_granularity = 0x1000; 344 if (dev->io_window_1k) { 345 /* Support 1K I/O space granularity */ 346 io_mask = PCI_IO_1K_RANGE_MASK; 347 io_granularity = 0x400; 348 } 349 350 res = child->resource[0]; 351 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); 352 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); 353 base = (io_base_lo & io_mask) << 8; 354 limit = (io_limit_lo & io_mask) << 8; 355 356 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { 357 u16 io_base_hi, io_limit_hi; 358 359 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); 360 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); 361 base |= ((unsigned long) io_base_hi << 16); 362 limit |= ((unsigned long) io_limit_hi << 16); 363 } 364 365 if (base <= limit) { 366 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; 367 region.start = base; 368 region.end = limit + io_granularity - 1; 369 pcibios_bus_to_resource(dev->bus, res, ®ion); 370 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); 371 } 372 } 373 374 static void pci_read_bridge_mmio(struct pci_bus *child) 375 { 376 struct pci_dev *dev = child->self; 377 u16 mem_base_lo, mem_limit_lo; 378 unsigned long base, limit; 379 struct pci_bus_region region; 380 struct resource *res; 381 382 res = child->resource[1]; 383 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); 384 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); 385 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; 386 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; 387 if (base <= limit) { 388 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; 389 region.start = base; 390 region.end = limit + 0xfffff; 391 pcibios_bus_to_resource(dev->bus, res, ®ion); 392 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); 393 } 394 } 395 396 static void pci_read_bridge_mmio_pref(struct pci_bus *child) 397 { 398 struct pci_dev *dev = child->self; 399 u16 mem_base_lo, mem_limit_lo; 400 u64 base64, limit64; 401 dma_addr_t base, limit; 402 struct pci_bus_region region; 403 struct resource *res; 404 405 res = child->resource[2]; 406 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); 407 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); 408 base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; 409 limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; 410 411 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { 412 u32 mem_base_hi, mem_limit_hi; 413 414 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); 415 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); 416 417 /* 418 * Some bridges set the base > limit by default, and some 419 * (broken) BIOSes do not initialize them. If we find 420 * this, just assume they are not being used. 421 */ 422 if (mem_base_hi <= mem_limit_hi) { 423 base64 |= (u64) mem_base_hi << 32; 424 limit64 |= (u64) mem_limit_hi << 32; 425 } 426 } 427 428 base = (dma_addr_t) base64; 429 limit = (dma_addr_t) limit64; 430 431 if (base != base64) { 432 dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n", 433 (unsigned long long) base64); 434 return; 435 } 436 437 if (base <= limit) { 438 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | 439 IORESOURCE_MEM | IORESOURCE_PREFETCH; 440 if (res->flags & PCI_PREF_RANGE_TYPE_64) 441 res->flags |= IORESOURCE_MEM_64; 442 region.start = base; 443 region.end = limit + 0xfffff; 444 pcibios_bus_to_resource(dev->bus, res, ®ion); 445 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); 446 } 447 } 448 449 void pci_read_bridge_bases(struct pci_bus *child) 450 { 451 struct pci_dev *dev = child->self; 452 struct resource *res; 453 int i; 454 455 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ 456 return; 457 458 dev_info(&dev->dev, "PCI bridge to %pR%s\n", 459 &child->busn_res, 460 dev->transparent ? " (subtractive decode)" : ""); 461 462 pci_bus_remove_resources(child); 463 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) 464 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; 465 466 pci_read_bridge_io(child); 467 pci_read_bridge_mmio(child); 468 pci_read_bridge_mmio_pref(child); 469 470 if (dev->transparent) { 471 pci_bus_for_each_resource(child->parent, res, i) { 472 if (res && res->flags) { 473 pci_bus_add_resource(child, res, 474 PCI_SUBTRACTIVE_DECODE); 475 dev_printk(KERN_DEBUG, &dev->dev, 476 " bridge window %pR (subtractive decode)\n", 477 res); 478 } 479 } 480 } 481 } 482 483 static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) 484 { 485 struct pci_bus *b; 486 487 b = kzalloc(sizeof(*b), GFP_KERNEL); 488 if (!b) 489 return NULL; 490 491 INIT_LIST_HEAD(&b->node); 492 INIT_LIST_HEAD(&b->children); 493 INIT_LIST_HEAD(&b->devices); 494 INIT_LIST_HEAD(&b->slots); 495 INIT_LIST_HEAD(&b->resources); 496 b->max_bus_speed = PCI_SPEED_UNKNOWN; 497 b->cur_bus_speed = PCI_SPEED_UNKNOWN; 498 #ifdef CONFIG_PCI_DOMAINS_GENERIC 499 if (parent) 500 b->domain_nr = parent->domain_nr; 501 #endif 502 return b; 503 } 504 505 static void pci_release_host_bridge_dev(struct device *dev) 506 { 507 struct pci_host_bridge *bridge = to_pci_host_bridge(dev); 508 509 if (bridge->release_fn) 510 bridge->release_fn(bridge); 511 512 pci_free_resource_list(&bridge->windows); 513 514 kfree(bridge); 515 } 516 517 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) 518 { 519 struct pci_host_bridge *bridge; 520 521 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); 522 if (!bridge) 523 return NULL; 524 525 INIT_LIST_HEAD(&bridge->windows); 526 bridge->bus = b; 527 return bridge; 528 } 529 530 static const unsigned char pcix_bus_speed[] = { 531 PCI_SPEED_UNKNOWN, /* 0 */ 532 PCI_SPEED_66MHz_PCIX, /* 1 */ 533 PCI_SPEED_100MHz_PCIX, /* 2 */ 534 PCI_SPEED_133MHz_PCIX, /* 3 */ 535 PCI_SPEED_UNKNOWN, /* 4 */ 536 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ 537 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ 538 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ 539 PCI_SPEED_UNKNOWN, /* 8 */ 540 PCI_SPEED_66MHz_PCIX_266, /* 9 */ 541 PCI_SPEED_100MHz_PCIX_266, /* A */ 542 PCI_SPEED_133MHz_PCIX_266, /* B */ 543 PCI_SPEED_UNKNOWN, /* C */ 544 PCI_SPEED_66MHz_PCIX_533, /* D */ 545 PCI_SPEED_100MHz_PCIX_533, /* E */ 546 PCI_SPEED_133MHz_PCIX_533 /* F */ 547 }; 548 549 const unsigned char pcie_link_speed[] = { 550 PCI_SPEED_UNKNOWN, /* 0 */ 551 PCIE_SPEED_2_5GT, /* 1 */ 552 PCIE_SPEED_5_0GT, /* 2 */ 553 PCIE_SPEED_8_0GT, /* 3 */ 554 PCI_SPEED_UNKNOWN, /* 4 */ 555 PCI_SPEED_UNKNOWN, /* 5 */ 556 PCI_SPEED_UNKNOWN, /* 6 */ 557 PCI_SPEED_UNKNOWN, /* 7 */ 558 PCI_SPEED_UNKNOWN, /* 8 */ 559 PCI_SPEED_UNKNOWN, /* 9 */ 560 PCI_SPEED_UNKNOWN, /* A */ 561 PCI_SPEED_UNKNOWN, /* B */ 562 PCI_SPEED_UNKNOWN, /* C */ 563 PCI_SPEED_UNKNOWN, /* D */ 564 PCI_SPEED_UNKNOWN, /* E */ 565 PCI_SPEED_UNKNOWN /* F */ 566 }; 567 568 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) 569 { 570 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; 571 } 572 EXPORT_SYMBOL_GPL(pcie_update_link_speed); 573 574 static unsigned char agp_speeds[] = { 575 AGP_UNKNOWN, 576 AGP_1X, 577 AGP_2X, 578 AGP_4X, 579 AGP_8X 580 }; 581 582 static enum pci_bus_speed agp_speed(int agp3, int agpstat) 583 { 584 int index = 0; 585 586 if (agpstat & 4) 587 index = 3; 588 else if (agpstat & 2) 589 index = 2; 590 else if (agpstat & 1) 591 index = 1; 592 else 593 goto out; 594 595 if (agp3) { 596 index += 2; 597 if (index == 5) 598 index = 0; 599 } 600 601 out: 602 return agp_speeds[index]; 603 } 604 605 static void pci_set_bus_speed(struct pci_bus *bus) 606 { 607 struct pci_dev *bridge = bus->self; 608 int pos; 609 610 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); 611 if (!pos) 612 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); 613 if (pos) { 614 u32 agpstat, agpcmd; 615 616 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); 617 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); 618 619 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); 620 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); 621 } 622 623 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); 624 if (pos) { 625 u16 status; 626 enum pci_bus_speed max; 627 628 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, 629 &status); 630 631 if (status & PCI_X_SSTATUS_533MHZ) { 632 max = PCI_SPEED_133MHz_PCIX_533; 633 } else if (status & PCI_X_SSTATUS_266MHZ) { 634 max = PCI_SPEED_133MHz_PCIX_266; 635 } else if (status & PCI_X_SSTATUS_133MHZ) { 636 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) 637 max = PCI_SPEED_133MHz_PCIX_ECC; 638 else 639 max = PCI_SPEED_133MHz_PCIX; 640 } else { 641 max = PCI_SPEED_66MHz_PCIX; 642 } 643 644 bus->max_bus_speed = max; 645 bus->cur_bus_speed = pcix_bus_speed[ 646 (status & PCI_X_SSTATUS_FREQ) >> 6]; 647 648 return; 649 } 650 651 if (pci_is_pcie(bridge)) { 652 u32 linkcap; 653 u16 linksta; 654 655 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); 656 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; 657 658 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); 659 pcie_update_link_speed(bus, linksta); 660 } 661 } 662 663 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, 664 struct pci_dev *bridge, int busnr) 665 { 666 struct pci_bus *child; 667 int i; 668 int ret; 669 670 /* 671 * Allocate a new bus, and inherit stuff from the parent.. 672 */ 673 child = pci_alloc_bus(parent); 674 if (!child) 675 return NULL; 676 677 child->parent = parent; 678 child->ops = parent->ops; 679 child->msi = parent->msi; 680 child->sysdata = parent->sysdata; 681 child->bus_flags = parent->bus_flags; 682 683 /* initialize some portions of the bus device, but don't register it 684 * now as the parent is not properly set up yet. 685 */ 686 child->dev.class = &pcibus_class; 687 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); 688 689 /* 690 * Set up the primary, secondary and subordinate 691 * bus numbers. 692 */ 693 child->number = child->busn_res.start = busnr; 694 child->primary = parent->busn_res.start; 695 child->busn_res.end = 0xff; 696 697 if (!bridge) { 698 child->dev.parent = parent->bridge; 699 goto add_dev; 700 } 701 702 child->self = bridge; 703 child->bridge = get_device(&bridge->dev); 704 child->dev.parent = child->bridge; 705 pci_set_bus_of_node(child); 706 pci_set_bus_speed(child); 707 708 /* Set up default resource pointers and names.. */ 709 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { 710 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; 711 child->resource[i]->name = child->name; 712 } 713 bridge->subordinate = child; 714 715 add_dev: 716 ret = device_register(&child->dev); 717 WARN_ON(ret < 0); 718 719 pcibios_add_bus(child); 720 721 /* Create legacy_io and legacy_mem files for this bus */ 722 pci_create_legacy_files(child); 723 724 return child; 725 } 726 727 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, 728 int busnr) 729 { 730 struct pci_bus *child; 731 732 child = pci_alloc_child_bus(parent, dev, busnr); 733 if (child) { 734 down_write(&pci_bus_sem); 735 list_add_tail(&child->node, &parent->children); 736 up_write(&pci_bus_sem); 737 } 738 return child; 739 } 740 EXPORT_SYMBOL(pci_add_new_bus); 741 742 static void pci_enable_crs(struct pci_dev *pdev) 743 { 744 u16 root_cap = 0; 745 746 /* Enable CRS Software Visibility if supported */ 747 pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); 748 if (root_cap & PCI_EXP_RTCAP_CRSVIS) 749 pcie_capability_set_word(pdev, PCI_EXP_RTCTL, 750 PCI_EXP_RTCTL_CRSSVE); 751 } 752 753 /* 754 * If it's a bridge, configure it and scan the bus behind it. 755 * For CardBus bridges, we don't scan behind as the devices will 756 * be handled by the bridge driver itself. 757 * 758 * We need to process bridges in two passes -- first we scan those 759 * already configured by the BIOS and after we are done with all of 760 * them, we proceed to assigning numbers to the remaining buses in 761 * order to avoid overlaps between old and new bus numbers. 762 */ 763 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) 764 { 765 struct pci_bus *child; 766 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); 767 u32 buses, i, j = 0; 768 u16 bctl; 769 u8 primary, secondary, subordinate; 770 int broken = 0; 771 772 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); 773 primary = buses & 0xFF; 774 secondary = (buses >> 8) & 0xFF; 775 subordinate = (buses >> 16) & 0xFF; 776 777 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", 778 secondary, subordinate, pass); 779 780 if (!primary && (primary != bus->number) && secondary && subordinate) { 781 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); 782 primary = bus->number; 783 } 784 785 /* Check if setup is sensible at all */ 786 if (!pass && 787 (primary != bus->number || secondary <= bus->number || 788 secondary > subordinate)) { 789 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", 790 secondary, subordinate); 791 broken = 1; 792 } 793 794 /* Disable MasterAbortMode during probing to avoid reporting 795 of bus errors (in some architectures) */ 796 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); 797 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, 798 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); 799 800 pci_enable_crs(dev); 801 802 if ((secondary || subordinate) && !pcibios_assign_all_busses() && 803 !is_cardbus && !broken) { 804 unsigned int cmax; 805 /* 806 * Bus already configured by firmware, process it in the first 807 * pass and just note the configuration. 808 */ 809 if (pass) 810 goto out; 811 812 /* 813 * The bus might already exist for two reasons: Either we are 814 * rescanning the bus or the bus is reachable through more than 815 * one bridge. The second case can happen with the i450NX 816 * chipset. 817 */ 818 child = pci_find_bus(pci_domain_nr(bus), secondary); 819 if (!child) { 820 child = pci_add_new_bus(bus, dev, secondary); 821 if (!child) 822 goto out; 823 child->primary = primary; 824 pci_bus_insert_busn_res(child, secondary, subordinate); 825 child->bridge_ctl = bctl; 826 } 827 828 cmax = pci_scan_child_bus(child); 829 if (cmax > subordinate) 830 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n", 831 subordinate, cmax); 832 /* subordinate should equal child->busn_res.end */ 833 if (subordinate > max) 834 max = subordinate; 835 } else { 836 /* 837 * We need to assign a number to this bus which we always 838 * do in the second pass. 839 */ 840 if (!pass) { 841 if (pcibios_assign_all_busses() || broken || is_cardbus) 842 /* Temporarily disable forwarding of the 843 configuration cycles on all bridges in 844 this bus segment to avoid possible 845 conflicts in the second pass between two 846 bridges programmed with overlapping 847 bus ranges. */ 848 pci_write_config_dword(dev, PCI_PRIMARY_BUS, 849 buses & ~0xffffff); 850 goto out; 851 } 852 853 /* Clear errors */ 854 pci_write_config_word(dev, PCI_STATUS, 0xffff); 855 856 /* Prevent assigning a bus number that already exists. 857 * This can happen when a bridge is hot-plugged, so in 858 * this case we only re-scan this bus. */ 859 child = pci_find_bus(pci_domain_nr(bus), max+1); 860 if (!child) { 861 child = pci_add_new_bus(bus, dev, max+1); 862 if (!child) 863 goto out; 864 pci_bus_insert_busn_res(child, max+1, 0xff); 865 } 866 max++; 867 buses = (buses & 0xff000000) 868 | ((unsigned int)(child->primary) << 0) 869 | ((unsigned int)(child->busn_res.start) << 8) 870 | ((unsigned int)(child->busn_res.end) << 16); 871 872 /* 873 * yenta.c forces a secondary latency timer of 176. 874 * Copy that behaviour here. 875 */ 876 if (is_cardbus) { 877 buses &= ~0xff000000; 878 buses |= CARDBUS_LATENCY_TIMER << 24; 879 } 880 881 /* 882 * We need to blast all three values with a single write. 883 */ 884 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); 885 886 if (!is_cardbus) { 887 child->bridge_ctl = bctl; 888 max = pci_scan_child_bus(child); 889 } else { 890 /* 891 * For CardBus bridges, we leave 4 bus numbers 892 * as cards with a PCI-to-PCI bridge can be 893 * inserted later. 894 */ 895 for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) { 896 struct pci_bus *parent = bus; 897 if (pci_find_bus(pci_domain_nr(bus), 898 max+i+1)) 899 break; 900 while (parent->parent) { 901 if ((!pcibios_assign_all_busses()) && 902 (parent->busn_res.end > max) && 903 (parent->busn_res.end <= max+i)) { 904 j = 1; 905 } 906 parent = parent->parent; 907 } 908 if (j) { 909 /* 910 * Often, there are two cardbus bridges 911 * -- try to leave one valid bus number 912 * for each one. 913 */ 914 i /= 2; 915 break; 916 } 917 } 918 max += i; 919 } 920 /* 921 * Set the subordinate bus number to its real value. 922 */ 923 pci_bus_update_busn_res_end(child, max); 924 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); 925 } 926 927 sprintf(child->name, 928 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), 929 pci_domain_nr(bus), child->number); 930 931 /* Has only triggered on CardBus, fixup is in yenta_socket */ 932 while (bus->parent) { 933 if ((child->busn_res.end > bus->busn_res.end) || 934 (child->number > bus->busn_res.end) || 935 (child->number < bus->number) || 936 (child->busn_res.end < bus->number)) { 937 dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n", 938 &child->busn_res, 939 (bus->number > child->busn_res.end && 940 bus->busn_res.end < child->number) ? 941 "wholly" : "partially", 942 bus->self->transparent ? " transparent" : "", 943 dev_name(&bus->dev), 944 &bus->busn_res); 945 } 946 bus = bus->parent; 947 } 948 949 out: 950 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); 951 952 return max; 953 } 954 EXPORT_SYMBOL(pci_scan_bridge); 955 956 /* 957 * Read interrupt line and base address registers. 958 * The architecture-dependent code can tweak these, of course. 959 */ 960 static void pci_read_irq(struct pci_dev *dev) 961 { 962 unsigned char irq; 963 964 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); 965 dev->pin = irq; 966 if (irq) 967 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); 968 dev->irq = irq; 969 } 970 971 void set_pcie_port_type(struct pci_dev *pdev) 972 { 973 int pos; 974 u16 reg16; 975 976 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); 977 if (!pos) 978 return; 979 pdev->pcie_cap = pos; 980 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); 981 pdev->pcie_flags_reg = reg16; 982 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); 983 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; 984 } 985 986 void set_pcie_hotplug_bridge(struct pci_dev *pdev) 987 { 988 u32 reg32; 989 990 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); 991 if (reg32 & PCI_EXP_SLTCAP_HPC) 992 pdev->is_hotplug_bridge = 1; 993 } 994 995 /** 996 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config? 997 * @dev: PCI device 998 * 999 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that 1000 * when forwarding a type1 configuration request the bridge must check that 1001 * the extended register address field is zero. The bridge is not permitted 1002 * to forward the transactions and must handle it as an Unsupported Request. 1003 * Some bridges do not follow this rule and simply drop the extended register 1004 * bits, resulting in the standard config space being aliased, every 256 1005 * bytes across the entire configuration space. Test for this condition by 1006 * comparing the first dword of each potential alias to the vendor/device ID. 1007 * Known offenders: 1008 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03) 1009 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40) 1010 */ 1011 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev) 1012 { 1013 #ifdef CONFIG_PCI_QUIRKS 1014 int pos; 1015 u32 header, tmp; 1016 1017 pci_read_config_dword(dev, PCI_VENDOR_ID, &header); 1018 1019 for (pos = PCI_CFG_SPACE_SIZE; 1020 pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) { 1021 if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL 1022 || header != tmp) 1023 return false; 1024 } 1025 1026 return true; 1027 #else 1028 return false; 1029 #endif 1030 } 1031 1032 /** 1033 * pci_cfg_space_size - get the configuration space size of the PCI device. 1034 * @dev: PCI device 1035 * 1036 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices 1037 * have 4096 bytes. Even if the device is capable, that doesn't mean we can 1038 * access it. Maybe we don't have a way to generate extended config space 1039 * accesses, or the device is behind a reverse Express bridge. So we try 1040 * reading the dword at 0x100 which must either be 0 or a valid extended 1041 * capability header. 1042 */ 1043 static int pci_cfg_space_size_ext(struct pci_dev *dev) 1044 { 1045 u32 status; 1046 int pos = PCI_CFG_SPACE_SIZE; 1047 1048 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) 1049 goto fail; 1050 if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev)) 1051 goto fail; 1052 1053 return PCI_CFG_SPACE_EXP_SIZE; 1054 1055 fail: 1056 return PCI_CFG_SPACE_SIZE; 1057 } 1058 1059 int pci_cfg_space_size(struct pci_dev *dev) 1060 { 1061 int pos; 1062 u32 status; 1063 u16 class; 1064 1065 class = dev->class >> 8; 1066 if (class == PCI_CLASS_BRIDGE_HOST) 1067 return pci_cfg_space_size_ext(dev); 1068 1069 if (!pci_is_pcie(dev)) { 1070 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); 1071 if (!pos) 1072 goto fail; 1073 1074 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); 1075 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) 1076 goto fail; 1077 } 1078 1079 return pci_cfg_space_size_ext(dev); 1080 1081 fail: 1082 return PCI_CFG_SPACE_SIZE; 1083 } 1084 1085 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) 1086 1087 /** 1088 * pci_setup_device - fill in class and map information of a device 1089 * @dev: the device structure to fill 1090 * 1091 * Initialize the device structure with information about the device's 1092 * vendor,class,memory and IO-space addresses,IRQ lines etc. 1093 * Called at initialisation of the PCI subsystem and by CardBus services. 1094 * Returns 0 on success and negative if unknown type of device (not normal, 1095 * bridge or CardBus). 1096 */ 1097 int pci_setup_device(struct pci_dev *dev) 1098 { 1099 u32 class; 1100 u8 hdr_type; 1101 struct pci_slot *slot; 1102 int pos = 0; 1103 struct pci_bus_region region; 1104 struct resource *res; 1105 1106 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) 1107 return -EIO; 1108 1109 dev->sysdata = dev->bus->sysdata; 1110 dev->dev.parent = dev->bus->bridge; 1111 dev->dev.bus = &pci_bus_type; 1112 dev->hdr_type = hdr_type & 0x7f; 1113 dev->multifunction = !!(hdr_type & 0x80); 1114 dev->error_state = pci_channel_io_normal; 1115 set_pcie_port_type(dev); 1116 1117 list_for_each_entry(slot, &dev->bus->slots, list) 1118 if (PCI_SLOT(dev->devfn) == slot->number) 1119 dev->slot = slot; 1120 1121 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) 1122 set this higher, assuming the system even supports it. */ 1123 dev->dma_mask = 0xffffffff; 1124 1125 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), 1126 dev->bus->number, PCI_SLOT(dev->devfn), 1127 PCI_FUNC(dev->devfn)); 1128 1129 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); 1130 dev->revision = class & 0xff; 1131 dev->class = class >> 8; /* upper 3 bytes */ 1132 1133 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", 1134 dev->vendor, dev->device, dev->hdr_type, dev->class); 1135 1136 /* need to have dev->class ready */ 1137 dev->cfg_size = pci_cfg_space_size(dev); 1138 1139 /* "Unknown power state" */ 1140 dev->current_state = PCI_UNKNOWN; 1141 1142 /* Early fixups, before probing the BARs */ 1143 pci_fixup_device(pci_fixup_early, dev); 1144 /* device class may be changed after fixup */ 1145 class = dev->class >> 8; 1146 1147 switch (dev->hdr_type) { /* header type */ 1148 case PCI_HEADER_TYPE_NORMAL: /* standard header */ 1149 if (class == PCI_CLASS_BRIDGE_PCI) 1150 goto bad; 1151 pci_read_irq(dev); 1152 pci_read_bases(dev, 6, PCI_ROM_ADDRESS); 1153 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); 1154 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); 1155 1156 /* 1157 * Do the ugly legacy mode stuff here rather than broken chip 1158 * quirk code. Legacy mode ATA controllers have fixed 1159 * addresses. These are not always echoed in BAR0-3, and 1160 * BAR0-3 in a few cases contain junk! 1161 */ 1162 if (class == PCI_CLASS_STORAGE_IDE) { 1163 u8 progif; 1164 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); 1165 if ((progif & 1) == 0) { 1166 region.start = 0x1F0; 1167 region.end = 0x1F7; 1168 res = &dev->resource[0]; 1169 res->flags = LEGACY_IO_RESOURCE; 1170 pcibios_bus_to_resource(dev->bus, res, ®ion); 1171 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n", 1172 res); 1173 region.start = 0x3F6; 1174 region.end = 0x3F6; 1175 res = &dev->resource[1]; 1176 res->flags = LEGACY_IO_RESOURCE; 1177 pcibios_bus_to_resource(dev->bus, res, ®ion); 1178 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n", 1179 res); 1180 } 1181 if ((progif & 4) == 0) { 1182 region.start = 0x170; 1183 region.end = 0x177; 1184 res = &dev->resource[2]; 1185 res->flags = LEGACY_IO_RESOURCE; 1186 pcibios_bus_to_resource(dev->bus, res, ®ion); 1187 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n", 1188 res); 1189 region.start = 0x376; 1190 region.end = 0x376; 1191 res = &dev->resource[3]; 1192 res->flags = LEGACY_IO_RESOURCE; 1193 pcibios_bus_to_resource(dev->bus, res, ®ion); 1194 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n", 1195 res); 1196 } 1197 } 1198 break; 1199 1200 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ 1201 if (class != PCI_CLASS_BRIDGE_PCI) 1202 goto bad; 1203 /* The PCI-to-PCI bridge spec requires that subtractive 1204 decoding (i.e. transparent) bridge must have programming 1205 interface code of 0x01. */ 1206 pci_read_irq(dev); 1207 dev->transparent = ((dev->class & 0xff) == 1); 1208 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); 1209 set_pcie_hotplug_bridge(dev); 1210 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); 1211 if (pos) { 1212 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); 1213 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); 1214 } 1215 break; 1216 1217 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ 1218 if (class != PCI_CLASS_BRIDGE_CARDBUS) 1219 goto bad; 1220 pci_read_irq(dev); 1221 pci_read_bases(dev, 1, 0); 1222 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); 1223 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); 1224 break; 1225 1226 default: /* unknown header */ 1227 dev_err(&dev->dev, "unknown header type %02x, ignoring device\n", 1228 dev->hdr_type); 1229 return -EIO; 1230 1231 bad: 1232 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n", 1233 dev->class, dev->hdr_type); 1234 dev->class = PCI_CLASS_NOT_DEFINED; 1235 } 1236 1237 /* We found a fine healthy device, go go go... */ 1238 return 0; 1239 } 1240 1241 static struct hpp_type0 pci_default_type0 = { 1242 .revision = 1, 1243 .cache_line_size = 8, 1244 .latency_timer = 0x40, 1245 .enable_serr = 0, 1246 .enable_perr = 0, 1247 }; 1248 1249 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp) 1250 { 1251 u16 pci_cmd, pci_bctl; 1252 1253 if (!hpp) 1254 hpp = &pci_default_type0; 1255 1256 if (hpp->revision > 1) { 1257 dev_warn(&dev->dev, 1258 "PCI settings rev %d not supported; using defaults\n", 1259 hpp->revision); 1260 hpp = &pci_default_type0; 1261 } 1262 1263 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size); 1264 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer); 1265 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 1266 if (hpp->enable_serr) 1267 pci_cmd |= PCI_COMMAND_SERR; 1268 if (hpp->enable_perr) 1269 pci_cmd |= PCI_COMMAND_PARITY; 1270 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 1271 1272 /* Program bridge control value */ 1273 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 1274 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 1275 hpp->latency_timer); 1276 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 1277 if (hpp->enable_serr) 1278 pci_bctl |= PCI_BRIDGE_CTL_SERR; 1279 if (hpp->enable_perr) 1280 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 1281 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 1282 } 1283 } 1284 1285 static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp) 1286 { 1287 if (hpp) 1288 dev_warn(&dev->dev, "PCI-X settings not supported\n"); 1289 } 1290 1291 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) 1292 { 1293 int pos; 1294 u32 reg32; 1295 1296 if (!hpp) 1297 return; 1298 1299 if (hpp->revision > 1) { 1300 dev_warn(&dev->dev, "PCIe settings rev %d not supported\n", 1301 hpp->revision); 1302 return; 1303 } 1304 1305 /* 1306 * Don't allow _HPX to change MPS or MRRS settings. We manage 1307 * those to make sure they're consistent with the rest of the 1308 * platform. 1309 */ 1310 hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD | 1311 PCI_EXP_DEVCTL_READRQ; 1312 hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD | 1313 PCI_EXP_DEVCTL_READRQ); 1314 1315 /* Initialize Device Control Register */ 1316 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, 1317 ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or); 1318 1319 /* Initialize Link Control Register */ 1320 if (pcie_cap_has_lnkctl(dev)) 1321 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL, 1322 ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or); 1323 1324 /* Find Advanced Error Reporting Enhanced Capability */ 1325 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); 1326 if (!pos) 1327 return; 1328 1329 /* Initialize Uncorrectable Error Mask Register */ 1330 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32); 1331 reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or; 1332 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32); 1333 1334 /* Initialize Uncorrectable Error Severity Register */ 1335 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32); 1336 reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or; 1337 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32); 1338 1339 /* Initialize Correctable Error Mask Register */ 1340 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32); 1341 reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or; 1342 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32); 1343 1344 /* Initialize Advanced Error Capabilities and Control Register */ 1345 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); 1346 reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or; 1347 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); 1348 1349 /* 1350 * FIXME: The following two registers are not supported yet. 1351 * 1352 * o Secondary Uncorrectable Error Severity Register 1353 * o Secondary Uncorrectable Error Mask Register 1354 */ 1355 } 1356 1357 static void pci_configure_device(struct pci_dev *dev) 1358 { 1359 struct hotplug_params hpp; 1360 int ret; 1361 1362 memset(&hpp, 0, sizeof(hpp)); 1363 ret = pci_get_hp_params(dev, &hpp); 1364 if (ret) 1365 return; 1366 1367 program_hpp_type2(dev, hpp.t2); 1368 program_hpp_type1(dev, hpp.t1); 1369 program_hpp_type0(dev, hpp.t0); 1370 } 1371 1372 static void pci_release_capabilities(struct pci_dev *dev) 1373 { 1374 pci_vpd_release(dev); 1375 pci_iov_release(dev); 1376 pci_free_cap_save_buffers(dev); 1377 } 1378 1379 /** 1380 * pci_release_dev - free a pci device structure when all users of it are finished. 1381 * @dev: device that's been disconnected 1382 * 1383 * Will be called only by the device core when all users of this pci device are 1384 * done. 1385 */ 1386 static void pci_release_dev(struct device *dev) 1387 { 1388 struct pci_dev *pci_dev; 1389 1390 pci_dev = to_pci_dev(dev); 1391 pci_release_capabilities(pci_dev); 1392 pci_release_of_node(pci_dev); 1393 pcibios_release_device(pci_dev); 1394 pci_bus_put(pci_dev->bus); 1395 kfree(pci_dev->driver_override); 1396 kfree(pci_dev); 1397 } 1398 1399 struct pci_dev *pci_alloc_dev(struct pci_bus *bus) 1400 { 1401 struct pci_dev *dev; 1402 1403 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); 1404 if (!dev) 1405 return NULL; 1406 1407 INIT_LIST_HEAD(&dev->bus_list); 1408 dev->dev.type = &pci_dev_type; 1409 dev->bus = pci_bus_get(bus); 1410 1411 return dev; 1412 } 1413 EXPORT_SYMBOL(pci_alloc_dev); 1414 1415 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, 1416 int crs_timeout) 1417 { 1418 int delay = 1; 1419 1420 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) 1421 return false; 1422 1423 /* some broken boards return 0 or ~0 if a slot is empty: */ 1424 if (*l == 0xffffffff || *l == 0x00000000 || 1425 *l == 0x0000ffff || *l == 0xffff0000) 1426 return false; 1427 1428 /* 1429 * Configuration Request Retry Status. Some root ports return the 1430 * actual device ID instead of the synthetic ID (0xFFFF) required 1431 * by the PCIe spec. Ignore the device ID and only check for 1432 * (vendor id == 1). 1433 */ 1434 while ((*l & 0xffff) == 0x0001) { 1435 if (!crs_timeout) 1436 return false; 1437 1438 msleep(delay); 1439 delay *= 2; 1440 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) 1441 return false; 1442 /* Card hasn't responded in 60 seconds? Must be stuck. */ 1443 if (delay > crs_timeout) { 1444 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n", 1445 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), 1446 PCI_FUNC(devfn)); 1447 return false; 1448 } 1449 } 1450 1451 return true; 1452 } 1453 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); 1454 1455 /* 1456 * Read the config data for a PCI device, sanity-check it 1457 * and fill in the dev structure... 1458 */ 1459 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) 1460 { 1461 struct pci_dev *dev; 1462 u32 l; 1463 1464 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) 1465 return NULL; 1466 1467 dev = pci_alloc_dev(bus); 1468 if (!dev) 1469 return NULL; 1470 1471 dev->devfn = devfn; 1472 dev->vendor = l & 0xffff; 1473 dev->device = (l >> 16) & 0xffff; 1474 1475 pci_set_of_node(dev); 1476 1477 if (pci_setup_device(dev)) { 1478 pci_bus_put(dev->bus); 1479 kfree(dev); 1480 return NULL; 1481 } 1482 1483 return dev; 1484 } 1485 1486 static void pci_init_capabilities(struct pci_dev *dev) 1487 { 1488 /* MSI/MSI-X list */ 1489 pci_msi_init_pci_dev(dev); 1490 1491 /* Buffers for saving PCIe and PCI-X capabilities */ 1492 pci_allocate_cap_save_buffers(dev); 1493 1494 /* Power Management */ 1495 pci_pm_init(dev); 1496 1497 /* Vital Product Data */ 1498 pci_vpd_pci22_init(dev); 1499 1500 /* Alternative Routing-ID Forwarding */ 1501 pci_configure_ari(dev); 1502 1503 /* Single Root I/O Virtualization */ 1504 pci_iov_init(dev); 1505 1506 /* Enable ACS P2P upstream forwarding */ 1507 pci_enable_acs(dev); 1508 } 1509 1510 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) 1511 { 1512 int ret; 1513 1514 pci_configure_device(dev); 1515 1516 device_initialize(&dev->dev); 1517 dev->dev.release = pci_release_dev; 1518 1519 set_dev_node(&dev->dev, pcibus_to_node(bus)); 1520 dev->dev.dma_mask = &dev->dma_mask; 1521 dev->dev.dma_parms = &dev->dma_parms; 1522 dev->dev.coherent_dma_mask = 0xffffffffull; 1523 1524 pci_set_dma_max_seg_size(dev, 65536); 1525 pci_set_dma_seg_boundary(dev, 0xffffffff); 1526 1527 /* Fix up broken headers */ 1528 pci_fixup_device(pci_fixup_header, dev); 1529 1530 /* moved out from quirk header fixup code */ 1531 pci_reassigndev_resource_alignment(dev); 1532 1533 /* Clear the state_saved flag. */ 1534 dev->state_saved = false; 1535 1536 /* Initialize various capabilities */ 1537 pci_init_capabilities(dev); 1538 1539 /* 1540 * Add the device to our list of discovered devices 1541 * and the bus list for fixup functions, etc. 1542 */ 1543 down_write(&pci_bus_sem); 1544 list_add_tail(&dev->bus_list, &bus->devices); 1545 up_write(&pci_bus_sem); 1546 1547 ret = pcibios_add_device(dev); 1548 WARN_ON(ret < 0); 1549 1550 /* Notifier could use PCI capabilities */ 1551 dev->match_driver = false; 1552 ret = device_add(&dev->dev); 1553 WARN_ON(ret < 0); 1554 } 1555 1556 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn) 1557 { 1558 struct pci_dev *dev; 1559 1560 dev = pci_get_slot(bus, devfn); 1561 if (dev) { 1562 pci_dev_put(dev); 1563 return dev; 1564 } 1565 1566 dev = pci_scan_device(bus, devfn); 1567 if (!dev) 1568 return NULL; 1569 1570 pci_device_add(dev, bus); 1571 1572 return dev; 1573 } 1574 EXPORT_SYMBOL(pci_scan_single_device); 1575 1576 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) 1577 { 1578 int pos; 1579 u16 cap = 0; 1580 unsigned next_fn; 1581 1582 if (pci_ari_enabled(bus)) { 1583 if (!dev) 1584 return 0; 1585 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); 1586 if (!pos) 1587 return 0; 1588 1589 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); 1590 next_fn = PCI_ARI_CAP_NFN(cap); 1591 if (next_fn <= fn) 1592 return 0; /* protect against malformed list */ 1593 1594 return next_fn; 1595 } 1596 1597 /* dev may be NULL for non-contiguous multifunction devices */ 1598 if (!dev || dev->multifunction) 1599 return (fn + 1) % 8; 1600 1601 return 0; 1602 } 1603 1604 static int only_one_child(struct pci_bus *bus) 1605 { 1606 struct pci_dev *parent = bus->self; 1607 1608 if (!parent || !pci_is_pcie(parent)) 1609 return 0; 1610 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) 1611 return 1; 1612 if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM && 1613 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) 1614 return 1; 1615 return 0; 1616 } 1617 1618 /** 1619 * pci_scan_slot - scan a PCI slot on a bus for devices. 1620 * @bus: PCI bus to scan 1621 * @devfn: slot number to scan (must have zero function.) 1622 * 1623 * Scan a PCI slot on the specified PCI bus for devices, adding 1624 * discovered devices to the @bus->devices list. New devices 1625 * will not have is_added set. 1626 * 1627 * Returns the number of new devices found. 1628 */ 1629 int pci_scan_slot(struct pci_bus *bus, int devfn) 1630 { 1631 unsigned fn, nr = 0; 1632 struct pci_dev *dev; 1633 1634 if (only_one_child(bus) && (devfn > 0)) 1635 return 0; /* Already scanned the entire slot */ 1636 1637 dev = pci_scan_single_device(bus, devfn); 1638 if (!dev) 1639 return 0; 1640 if (!dev->is_added) 1641 nr++; 1642 1643 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { 1644 dev = pci_scan_single_device(bus, devfn + fn); 1645 if (dev) { 1646 if (!dev->is_added) 1647 nr++; 1648 dev->multifunction = 1; 1649 } 1650 } 1651 1652 /* only one slot has pcie device */ 1653 if (bus->self && nr) 1654 pcie_aspm_init_link_state(bus->self); 1655 1656 return nr; 1657 } 1658 EXPORT_SYMBOL(pci_scan_slot); 1659 1660 static int pcie_find_smpss(struct pci_dev *dev, void *data) 1661 { 1662 u8 *smpss = data; 1663 1664 if (!pci_is_pcie(dev)) 1665 return 0; 1666 1667 /* 1668 * We don't have a way to change MPS settings on devices that have 1669 * drivers attached. A hot-added device might support only the minimum 1670 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge 1671 * where devices may be hot-added, we limit the fabric MPS to 128 so 1672 * hot-added devices will work correctly. 1673 * 1674 * However, if we hot-add a device to a slot directly below a Root 1675 * Port, it's impossible for there to be other existing devices below 1676 * the port. We don't limit the MPS in this case because we can 1677 * reconfigure MPS on both the Root Port and the hot-added device, 1678 * and there are no other devices involved. 1679 * 1680 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA. 1681 */ 1682 if (dev->is_hotplug_bridge && 1683 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) 1684 *smpss = 0; 1685 1686 if (*smpss > dev->pcie_mpss) 1687 *smpss = dev->pcie_mpss; 1688 1689 return 0; 1690 } 1691 1692 static void pcie_write_mps(struct pci_dev *dev, int mps) 1693 { 1694 int rc; 1695 1696 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { 1697 mps = 128 << dev->pcie_mpss; 1698 1699 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && 1700 dev->bus->self) 1701 /* For "Performance", the assumption is made that 1702 * downstream communication will never be larger than 1703 * the MRRS. So, the MPS only needs to be configured 1704 * for the upstream communication. This being the case, 1705 * walk from the top down and set the MPS of the child 1706 * to that of the parent bus. 1707 * 1708 * Configure the device MPS with the smaller of the 1709 * device MPSS or the bridge MPS (which is assumed to be 1710 * properly configured at this point to the largest 1711 * allowable MPS based on its parent bus). 1712 */ 1713 mps = min(mps, pcie_get_mps(dev->bus->self)); 1714 } 1715 1716 rc = pcie_set_mps(dev, mps); 1717 if (rc) 1718 dev_err(&dev->dev, "Failed attempting to set the MPS\n"); 1719 } 1720 1721 static void pcie_write_mrrs(struct pci_dev *dev) 1722 { 1723 int rc, mrrs; 1724 1725 /* In the "safe" case, do not configure the MRRS. There appear to be 1726 * issues with setting MRRS to 0 on a number of devices. 1727 */ 1728 if (pcie_bus_config != PCIE_BUS_PERFORMANCE) 1729 return; 1730 1731 /* For Max performance, the MRRS must be set to the largest supported 1732 * value. However, it cannot be configured larger than the MPS the 1733 * device or the bus can support. This should already be properly 1734 * configured by a prior call to pcie_write_mps. 1735 */ 1736 mrrs = pcie_get_mps(dev); 1737 1738 /* MRRS is a R/W register. Invalid values can be written, but a 1739 * subsequent read will verify if the value is acceptable or not. 1740 * If the MRRS value provided is not acceptable (e.g., too large), 1741 * shrink the value until it is acceptable to the HW. 1742 */ 1743 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { 1744 rc = pcie_set_readrq(dev, mrrs); 1745 if (!rc) 1746 break; 1747 1748 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); 1749 mrrs /= 2; 1750 } 1751 1752 if (mrrs < 128) 1753 dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n"); 1754 } 1755 1756 static void pcie_bus_detect_mps(struct pci_dev *dev) 1757 { 1758 struct pci_dev *bridge = dev->bus->self; 1759 int mps, p_mps; 1760 1761 if (!bridge) 1762 return; 1763 1764 mps = pcie_get_mps(dev); 1765 p_mps = pcie_get_mps(bridge); 1766 1767 if (mps != p_mps) 1768 dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", 1769 mps, pci_name(bridge), p_mps); 1770 } 1771 1772 static int pcie_bus_configure_set(struct pci_dev *dev, void *data) 1773 { 1774 int mps, orig_mps; 1775 1776 if (!pci_is_pcie(dev)) 1777 return 0; 1778 1779 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) { 1780 pcie_bus_detect_mps(dev); 1781 return 0; 1782 } 1783 1784 mps = 128 << *(u8 *)data; 1785 orig_mps = pcie_get_mps(dev); 1786 1787 pcie_write_mps(dev, mps); 1788 pcie_write_mrrs(dev); 1789 1790 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n", 1791 pcie_get_mps(dev), 128 << dev->pcie_mpss, 1792 orig_mps, pcie_get_readrq(dev)); 1793 1794 return 0; 1795 } 1796 1797 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, 1798 * parents then children fashion. If this changes, then this code will not 1799 * work as designed. 1800 */ 1801 void pcie_bus_configure_settings(struct pci_bus *bus) 1802 { 1803 u8 smpss = 0; 1804 1805 if (!bus->self) 1806 return; 1807 1808 if (!pci_is_pcie(bus->self)) 1809 return; 1810 1811 /* FIXME - Peer to peer DMA is possible, though the endpoint would need 1812 * to be aware of the MPS of the destination. To work around this, 1813 * simply force the MPS of the entire system to the smallest possible. 1814 */ 1815 if (pcie_bus_config == PCIE_BUS_PEER2PEER) 1816 smpss = 0; 1817 1818 if (pcie_bus_config == PCIE_BUS_SAFE) { 1819 smpss = bus->self->pcie_mpss; 1820 1821 pcie_find_smpss(bus->self, &smpss); 1822 pci_walk_bus(bus, pcie_find_smpss, &smpss); 1823 } 1824 1825 pcie_bus_configure_set(bus->self, &smpss); 1826 pci_walk_bus(bus, pcie_bus_configure_set, &smpss); 1827 } 1828 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); 1829 1830 unsigned int pci_scan_child_bus(struct pci_bus *bus) 1831 { 1832 unsigned int devfn, pass, max = bus->busn_res.start; 1833 struct pci_dev *dev; 1834 1835 dev_dbg(&bus->dev, "scanning bus\n"); 1836 1837 /* Go find them, Rover! */ 1838 for (devfn = 0; devfn < 0x100; devfn += 8) 1839 pci_scan_slot(bus, devfn); 1840 1841 /* Reserve buses for SR-IOV capability. */ 1842 max += pci_iov_bus_range(bus); 1843 1844 /* 1845 * After performing arch-dependent fixup of the bus, look behind 1846 * all PCI-to-PCI bridges on this bus. 1847 */ 1848 if (!bus->is_added) { 1849 dev_dbg(&bus->dev, "fixups for bus\n"); 1850 pcibios_fixup_bus(bus); 1851 bus->is_added = 1; 1852 } 1853 1854 for (pass = 0; pass < 2; pass++) 1855 list_for_each_entry(dev, &bus->devices, bus_list) { 1856 if (pci_is_bridge(dev)) 1857 max = pci_scan_bridge(bus, dev, max, pass); 1858 } 1859 1860 /* 1861 * We've scanned the bus and so we know all about what's on 1862 * the other side of any bridges that may be on this bus plus 1863 * any devices. 1864 * 1865 * Return how far we've got finding sub-buses. 1866 */ 1867 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); 1868 return max; 1869 } 1870 EXPORT_SYMBOL_GPL(pci_scan_child_bus); 1871 1872 /** 1873 * pcibios_root_bridge_prepare - Platform-specific host bridge setup. 1874 * @bridge: Host bridge to set up. 1875 * 1876 * Default empty implementation. Replace with an architecture-specific setup 1877 * routine, if necessary. 1878 */ 1879 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) 1880 { 1881 return 0; 1882 } 1883 1884 void __weak pcibios_add_bus(struct pci_bus *bus) 1885 { 1886 } 1887 1888 void __weak pcibios_remove_bus(struct pci_bus *bus) 1889 { 1890 } 1891 1892 struct pci_bus *pci_create_root_bus(struct device *parent, int bus, 1893 struct pci_ops *ops, void *sysdata, struct list_head *resources) 1894 { 1895 int error; 1896 struct pci_host_bridge *bridge; 1897 struct pci_bus *b, *b2; 1898 struct resource_entry *window, *n; 1899 struct resource *res; 1900 resource_size_t offset; 1901 char bus_addr[64]; 1902 char *fmt; 1903 1904 b = pci_alloc_bus(NULL); 1905 if (!b) 1906 return NULL; 1907 1908 b->sysdata = sysdata; 1909 b->ops = ops; 1910 b->number = b->busn_res.start = bus; 1911 pci_bus_assign_domain_nr(b, parent); 1912 b2 = pci_find_bus(pci_domain_nr(b), bus); 1913 if (b2) { 1914 /* If we already got to this bus through a different bridge, ignore it */ 1915 dev_dbg(&b2->dev, "bus already known\n"); 1916 goto err_out; 1917 } 1918 1919 bridge = pci_alloc_host_bridge(b); 1920 if (!bridge) 1921 goto err_out; 1922 1923 bridge->dev.parent = parent; 1924 bridge->dev.release = pci_release_host_bridge_dev; 1925 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); 1926 error = pcibios_root_bridge_prepare(bridge); 1927 if (error) { 1928 kfree(bridge); 1929 goto err_out; 1930 } 1931 1932 error = device_register(&bridge->dev); 1933 if (error) { 1934 put_device(&bridge->dev); 1935 goto err_out; 1936 } 1937 b->bridge = get_device(&bridge->dev); 1938 device_enable_async_suspend(b->bridge); 1939 pci_set_bus_of_node(b); 1940 1941 if (!parent) 1942 set_dev_node(b->bridge, pcibus_to_node(b)); 1943 1944 b->dev.class = &pcibus_class; 1945 b->dev.parent = b->bridge; 1946 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); 1947 error = device_register(&b->dev); 1948 if (error) 1949 goto class_dev_reg_err; 1950 1951 pcibios_add_bus(b); 1952 1953 /* Create legacy_io and legacy_mem files for this bus */ 1954 pci_create_legacy_files(b); 1955 1956 if (parent) 1957 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); 1958 else 1959 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); 1960 1961 /* Add initial resources to the bus */ 1962 resource_list_for_each_entry_safe(window, n, resources) { 1963 list_move_tail(&window->node, &bridge->windows); 1964 res = window->res; 1965 offset = window->offset; 1966 if (res->flags & IORESOURCE_BUS) 1967 pci_bus_insert_busn_res(b, bus, res->end); 1968 else 1969 pci_bus_add_resource(b, res, 0); 1970 if (offset) { 1971 if (resource_type(res) == IORESOURCE_IO) 1972 fmt = " (bus address [%#06llx-%#06llx])"; 1973 else 1974 fmt = " (bus address [%#010llx-%#010llx])"; 1975 snprintf(bus_addr, sizeof(bus_addr), fmt, 1976 (unsigned long long) (res->start - offset), 1977 (unsigned long long) (res->end - offset)); 1978 } else 1979 bus_addr[0] = '\0'; 1980 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); 1981 } 1982 1983 down_write(&pci_bus_sem); 1984 list_add_tail(&b->node, &pci_root_buses); 1985 up_write(&pci_bus_sem); 1986 1987 return b; 1988 1989 class_dev_reg_err: 1990 put_device(&bridge->dev); 1991 device_unregister(&bridge->dev); 1992 err_out: 1993 kfree(b); 1994 return NULL; 1995 } 1996 1997 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) 1998 { 1999 struct resource *res = &b->busn_res; 2000 struct resource *parent_res, *conflict; 2001 2002 res->start = bus; 2003 res->end = bus_max; 2004 res->flags = IORESOURCE_BUS; 2005 2006 if (!pci_is_root_bus(b)) 2007 parent_res = &b->parent->busn_res; 2008 else { 2009 parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); 2010 res->flags |= IORESOURCE_PCI_FIXED; 2011 } 2012 2013 conflict = request_resource_conflict(parent_res, res); 2014 2015 if (conflict) 2016 dev_printk(KERN_DEBUG, &b->dev, 2017 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", 2018 res, pci_is_root_bus(b) ? "domain " : "", 2019 parent_res, conflict->name, conflict); 2020 2021 return conflict == NULL; 2022 } 2023 2024 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) 2025 { 2026 struct resource *res = &b->busn_res; 2027 struct resource old_res = *res; 2028 resource_size_t size; 2029 int ret; 2030 2031 if (res->start > bus_max) 2032 return -EINVAL; 2033 2034 size = bus_max - res->start + 1; 2035 ret = adjust_resource(res, res->start, size); 2036 dev_printk(KERN_DEBUG, &b->dev, 2037 "busn_res: %pR end %s updated to %02x\n", 2038 &old_res, ret ? "can not be" : "is", bus_max); 2039 2040 if (!ret && !res->parent) 2041 pci_bus_insert_busn_res(b, res->start, res->end); 2042 2043 return ret; 2044 } 2045 2046 void pci_bus_release_busn_res(struct pci_bus *b) 2047 { 2048 struct resource *res = &b->busn_res; 2049 int ret; 2050 2051 if (!res->flags || !res->parent) 2052 return; 2053 2054 ret = release_resource(res); 2055 dev_printk(KERN_DEBUG, &b->dev, 2056 "busn_res: %pR %s released\n", 2057 res, ret ? "can not be" : "is"); 2058 } 2059 2060 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, 2061 struct pci_ops *ops, void *sysdata, struct list_head *resources) 2062 { 2063 struct resource_entry *window; 2064 bool found = false; 2065 struct pci_bus *b; 2066 int max; 2067 2068 resource_list_for_each_entry(window, resources) 2069 if (window->res->flags & IORESOURCE_BUS) { 2070 found = true; 2071 break; 2072 } 2073 2074 b = pci_create_root_bus(parent, bus, ops, sysdata, resources); 2075 if (!b) 2076 return NULL; 2077 2078 if (!found) { 2079 dev_info(&b->dev, 2080 "No busn resource found for root bus, will use [bus %02x-ff]\n", 2081 bus); 2082 pci_bus_insert_busn_res(b, bus, 255); 2083 } 2084 2085 max = pci_scan_child_bus(b); 2086 2087 if (!found) 2088 pci_bus_update_busn_res_end(b, max); 2089 2090 pci_bus_add_devices(b); 2091 return b; 2092 } 2093 EXPORT_SYMBOL(pci_scan_root_bus); 2094 2095 /* Deprecated; use pci_scan_root_bus() instead */ 2096 struct pci_bus *pci_scan_bus_parented(struct device *parent, 2097 int bus, struct pci_ops *ops, void *sysdata) 2098 { 2099 LIST_HEAD(resources); 2100 struct pci_bus *b; 2101 2102 pci_add_resource(&resources, &ioport_resource); 2103 pci_add_resource(&resources, &iomem_resource); 2104 pci_add_resource(&resources, &busn_resource); 2105 b = pci_create_root_bus(parent, bus, ops, sysdata, &resources); 2106 if (b) 2107 pci_scan_child_bus(b); 2108 else 2109 pci_free_resource_list(&resources); 2110 return b; 2111 } 2112 EXPORT_SYMBOL(pci_scan_bus_parented); 2113 2114 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, 2115 void *sysdata) 2116 { 2117 LIST_HEAD(resources); 2118 struct pci_bus *b; 2119 2120 pci_add_resource(&resources, &ioport_resource); 2121 pci_add_resource(&resources, &iomem_resource); 2122 pci_add_resource(&resources, &busn_resource); 2123 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); 2124 if (b) { 2125 pci_scan_child_bus(b); 2126 pci_bus_add_devices(b); 2127 } else { 2128 pci_free_resource_list(&resources); 2129 } 2130 return b; 2131 } 2132 EXPORT_SYMBOL(pci_scan_bus); 2133 2134 /** 2135 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. 2136 * @bridge: PCI bridge for the bus to scan 2137 * 2138 * Scan a PCI bus and child buses for new devices, add them, 2139 * and enable them, resizing bridge mmio/io resource if necessary 2140 * and possible. The caller must ensure the child devices are already 2141 * removed for resizing to occur. 2142 * 2143 * Returns the max number of subordinate bus discovered. 2144 */ 2145 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge) 2146 { 2147 unsigned int max; 2148 struct pci_bus *bus = bridge->subordinate; 2149 2150 max = pci_scan_child_bus(bus); 2151 2152 pci_assign_unassigned_bridge_resources(bridge); 2153 2154 pci_bus_add_devices(bus); 2155 2156 return max; 2157 } 2158 2159 /** 2160 * pci_rescan_bus - scan a PCI bus for devices. 2161 * @bus: PCI bus to scan 2162 * 2163 * Scan a PCI bus and child buses for new devices, adds them, 2164 * and enables them. 2165 * 2166 * Returns the max number of subordinate bus discovered. 2167 */ 2168 unsigned int pci_rescan_bus(struct pci_bus *bus) 2169 { 2170 unsigned int max; 2171 2172 max = pci_scan_child_bus(bus); 2173 pci_assign_unassigned_bus_resources(bus); 2174 pci_bus_add_devices(bus); 2175 2176 return max; 2177 } 2178 EXPORT_SYMBOL_GPL(pci_rescan_bus); 2179 2180 /* 2181 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal 2182 * routines should always be executed under this mutex. 2183 */ 2184 static DEFINE_MUTEX(pci_rescan_remove_lock); 2185 2186 void pci_lock_rescan_remove(void) 2187 { 2188 mutex_lock(&pci_rescan_remove_lock); 2189 } 2190 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); 2191 2192 void pci_unlock_rescan_remove(void) 2193 { 2194 mutex_unlock(&pci_rescan_remove_lock); 2195 } 2196 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); 2197 2198 static int __init pci_sort_bf_cmp(const struct device *d_a, 2199 const struct device *d_b) 2200 { 2201 const struct pci_dev *a = to_pci_dev(d_a); 2202 const struct pci_dev *b = to_pci_dev(d_b); 2203 2204 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; 2205 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; 2206 2207 if (a->bus->number < b->bus->number) return -1; 2208 else if (a->bus->number > b->bus->number) return 1; 2209 2210 if (a->devfn < b->devfn) return -1; 2211 else if (a->devfn > b->devfn) return 1; 2212 2213 return 0; 2214 } 2215 2216 void __init pci_sort_breadthfirst(void) 2217 { 2218 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); 2219 } 2220