1 /* 2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 3 * 4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 6 * Copyright (C) 2002,2003 NEC Corporation 7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) 8 * Copyright (C) 2003-2005 Hewlett Packard 9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 10 * Copyright (C) 2005 Intel Corporation 11 * 12 * All rights reserved. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or (at 17 * your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, but 20 * WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 22 * NON INFRINGEMENT. See the GNU General Public License for more 23 * details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Send feedback to <kristen.c.accardi@intel.com> 30 * 31 */ 32 33 /* 34 * Lifetime rules for pci_dev: 35 * - The one in acpiphp_func has its refcount elevated by pci_get_slot() 36 * when the driver is loaded or when an insertion event occurs. It loses 37 * a refcount when its ejected or the driver unloads. 38 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 39 * when the bridge is scanned and it loses a refcount when the bridge 40 * is removed. 41 */ 42 43 #include <linux/init.h> 44 #include <linux/module.h> 45 46 #include <linux/kernel.h> 47 #include <linux/pci.h> 48 #include <linux/pci_hotplug.h> 49 #include <linux/smp_lock.h> 50 #include <linux/mutex.h> 51 52 #include "../pci.h" 53 #include "acpiphp.h" 54 55 static LIST_HEAD(bridge_list); 56 static LIST_HEAD(ioapic_list); 57 static DEFINE_SPINLOCK(ioapic_list_lock); 58 59 #define MY_NAME "acpiphp_glue" 60 61 static void handle_hotplug_event_bridge (acpi_handle, u32, void *); 62 static void acpiphp_sanitize_bus(struct pci_bus *bus); 63 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus); 64 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); 65 66 67 /* 68 * initialization & terminatation routines 69 */ 70 71 /** 72 * is_ejectable - determine if a slot is ejectable 73 * @handle: handle to acpi namespace 74 * 75 * Ejectable slot should satisfy at least these conditions: 76 * 77 * 1. has _ADR method 78 * 2. has _EJ0 method 79 * 80 * optionally 81 * 82 * 1. has _STA method 83 * 2. has _PS0 method 84 * 3. has _PS3 method 85 * 4. .. 86 * 87 */ 88 static int is_ejectable(acpi_handle handle) 89 { 90 acpi_status status; 91 acpi_handle tmp; 92 93 status = acpi_get_handle(handle, "_ADR", &tmp); 94 if (ACPI_FAILURE(status)) { 95 return 0; 96 } 97 98 status = acpi_get_handle(handle, "_EJ0", &tmp); 99 if (ACPI_FAILURE(status)) { 100 return 0; 101 } 102 103 return 1; 104 } 105 106 107 /* callback routine to check the existence of ejectable slots */ 108 static acpi_status 109 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 110 { 111 int *count = (int *)context; 112 113 if (is_ejectable(handle)) { 114 (*count)++; 115 /* only one ejectable slot is enough */ 116 return AE_CTRL_TERMINATE; 117 } else { 118 return AE_OK; 119 } 120 } 121 122 /* callback routine to check for the existance of a pci dock device */ 123 static acpi_status 124 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) 125 { 126 int *count = (int *)context; 127 128 if (is_dock_device(handle)) { 129 (*count)++; 130 return AE_CTRL_TERMINATE; 131 } else { 132 return AE_OK; 133 } 134 } 135 136 137 138 139 /* 140 * the _DCK method can do funny things... and sometimes not 141 * hah-hah funny. 142 * 143 * TBD - figure out a way to only call fixups for 144 * systems that require them. 145 */ 146 static int post_dock_fixups(struct notifier_block *nb, unsigned long val, 147 void *v) 148 { 149 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); 150 struct pci_bus *bus = func->slot->bridge->pci_bus; 151 u32 buses; 152 153 if (!bus->self) 154 return NOTIFY_OK; 155 156 /* fixup bad _DCK function that rewrites 157 * secondary bridge on slot 158 */ 159 pci_read_config_dword(bus->self, 160 PCI_PRIMARY_BUS, 161 &buses); 162 163 if (((buses >> 8) & 0xff) != bus->secondary) { 164 buses = (buses & 0xff000000) 165 | ((unsigned int)(bus->primary) << 0) 166 | ((unsigned int)(bus->secondary) << 8) 167 | ((unsigned int)(bus->subordinate) << 16); 168 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 169 } 170 return NOTIFY_OK; 171 } 172 173 174 175 176 /* callback routine to register each ACPI PCI slot object */ 177 static acpi_status 178 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 179 { 180 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 181 struct acpiphp_slot *slot; 182 struct acpiphp_func *newfunc; 183 acpi_handle tmp; 184 acpi_status status = AE_OK; 185 unsigned long adr, sun; 186 int device, function, retval; 187 188 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 189 190 if (ACPI_FAILURE(status)) 191 return AE_OK; 192 193 status = acpi_get_handle(handle, "_EJ0", &tmp); 194 195 if (ACPI_FAILURE(status) && !(is_dock_device(handle))) 196 return AE_OK; 197 198 device = (adr >> 16) & 0xffff; 199 function = adr & 0xffff; 200 201 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 202 if (!newfunc) 203 return AE_NO_MEMORY; 204 205 INIT_LIST_HEAD(&newfunc->sibling); 206 newfunc->handle = handle; 207 newfunc->function = function; 208 if (ACPI_SUCCESS(status)) 209 newfunc->flags = FUNC_HAS_EJ0; 210 211 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 212 newfunc->flags |= FUNC_HAS_STA; 213 214 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 215 newfunc->flags |= FUNC_HAS_PS0; 216 217 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 218 newfunc->flags |= FUNC_HAS_PS3; 219 220 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 221 newfunc->flags |= FUNC_HAS_DCK; 222 223 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 224 if (ACPI_FAILURE(status)) { 225 /* 226 * use the count of the number of slots we've found 227 * for the number of the slot 228 */ 229 sun = bridge->nr_slots+1; 230 } 231 232 /* search for objects that share the same slot */ 233 for (slot = bridge->slots; slot; slot = slot->next) 234 if (slot->device == device) { 235 if (slot->sun != sun) 236 warn("sibling found, but _SUN doesn't match!\n"); 237 break; 238 } 239 240 if (!slot) { 241 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 242 if (!slot) { 243 kfree(newfunc); 244 return AE_NO_MEMORY; 245 } 246 247 slot->bridge = bridge; 248 slot->device = device; 249 slot->sun = sun; 250 INIT_LIST_HEAD(&slot->funcs); 251 mutex_init(&slot->crit_sect); 252 253 slot->next = bridge->slots; 254 bridge->slots = slot; 255 256 bridge->nr_slots++; 257 258 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n", 259 slot->sun, pci_domain_nr(bridge->pci_bus), 260 bridge->pci_bus->number, slot->device); 261 retval = acpiphp_register_hotplug_slot(slot); 262 if (retval) { 263 warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval); 264 goto err_exit; 265 } 266 } 267 268 newfunc->slot = slot; 269 list_add_tail(&newfunc->sibling, &slot->funcs); 270 271 /* associate corresponding pci_dev */ 272 newfunc->pci_dev = pci_get_slot(bridge->pci_bus, 273 PCI_DEVFN(device, function)); 274 if (newfunc->pci_dev) { 275 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 276 } 277 278 if (is_dock_device(handle)) { 279 /* we don't want to call this device's _EJ0 280 * because we want the dock notify handler 281 * to call it after it calls _DCK 282 */ 283 newfunc->flags &= ~FUNC_HAS_EJ0; 284 if (register_hotplug_dock_device(handle, 285 handle_hotplug_event_func, newfunc)) 286 dbg("failed to register dock device\n"); 287 288 /* we need to be notified when dock events happen 289 * outside of the hotplug operation, since we may 290 * need to do fixups before we can hotplug. 291 */ 292 newfunc->nb.notifier_call = post_dock_fixups; 293 if (register_dock_notifier(&newfunc->nb)) 294 dbg("failed to register a dock notifier"); 295 } 296 297 /* install notify handler */ 298 if (!(newfunc->flags & FUNC_HAS_DCK)) { 299 status = acpi_install_notify_handler(handle, 300 ACPI_SYSTEM_NOTIFY, 301 handle_hotplug_event_func, 302 newfunc); 303 304 if (ACPI_FAILURE(status)) 305 err("failed to register interrupt notify handler\n"); 306 } else 307 status = AE_OK; 308 309 return status; 310 311 err_exit: 312 bridge->nr_slots--; 313 bridge->slots = slot->next; 314 kfree(slot); 315 kfree(newfunc); 316 317 return AE_OK; 318 } 319 320 321 /* see if it's worth looking at this bridge */ 322 static int detect_ejectable_slots(acpi_handle *bridge_handle) 323 { 324 acpi_status status; 325 int count; 326 327 count = 0; 328 329 /* only check slots defined directly below bridge object */ 330 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, 331 is_ejectable_slot, (void *)&count, NULL); 332 333 /* 334 * we also need to add this bridge if there is a dock bridge or 335 * other pci device on a dock station (removable) 336 */ 337 if (!count) 338 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, 339 (u32)1, is_pci_dock_device, (void *)&count, 340 NULL); 341 342 return count; 343 } 344 345 346 /* decode ACPI 2.0 _HPP hot plug parameters */ 347 static void decode_hpp(struct acpiphp_bridge *bridge) 348 { 349 acpi_status status; 350 351 status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp); 352 if (ACPI_FAILURE(status) || 353 !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) { 354 /* use default numbers */ 355 printk(KERN_WARNING 356 "%s: Could not get hotplug parameters. Use defaults\n", 357 __FUNCTION__); 358 bridge->hpp.t0 = &bridge->hpp.type0_data; 359 bridge->hpp.t0->revision = 0; 360 bridge->hpp.t0->cache_line_size = 0x10; 361 bridge->hpp.t0->latency_timer = 0x40; 362 bridge->hpp.t0->enable_serr = 0; 363 bridge->hpp.t0->enable_perr = 0; 364 } 365 } 366 367 368 369 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 370 static void init_bridge_misc(struct acpiphp_bridge *bridge) 371 { 372 acpi_status status; 373 374 /* decode ACPI 2.0 _HPP (hot plug parameters) */ 375 decode_hpp(bridge); 376 377 /* must be added to the list prior to calling register_slot */ 378 list_add(&bridge->list, &bridge_list); 379 380 /* register all slot objects under this bridge */ 381 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 382 register_slot, bridge, NULL); 383 if (ACPI_FAILURE(status)) { 384 list_del(&bridge->list); 385 return; 386 } 387 388 /* install notify handler */ 389 if (bridge->type != BRIDGE_TYPE_HOST) { 390 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 391 status = acpi_remove_notify_handler(bridge->func->handle, 392 ACPI_SYSTEM_NOTIFY, 393 handle_hotplug_event_func); 394 if (ACPI_FAILURE(status)) 395 err("failed to remove notify handler\n"); 396 } 397 status = acpi_install_notify_handler(bridge->handle, 398 ACPI_SYSTEM_NOTIFY, 399 handle_hotplug_event_bridge, 400 bridge); 401 402 if (ACPI_FAILURE(status)) { 403 err("failed to register interrupt notify handler\n"); 404 } 405 } 406 } 407 408 409 /* find acpiphp_func from acpiphp_bridge */ 410 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 411 { 412 struct list_head *node, *l; 413 struct acpiphp_bridge *bridge; 414 struct acpiphp_slot *slot; 415 struct acpiphp_func *func; 416 417 list_for_each(node, &bridge_list) { 418 bridge = list_entry(node, struct acpiphp_bridge, list); 419 for (slot = bridge->slots; slot; slot = slot->next) { 420 list_for_each(l, &slot->funcs) { 421 func = list_entry(l, struct acpiphp_func, 422 sibling); 423 if (func->handle == handle) 424 return func; 425 } 426 } 427 } 428 429 return NULL; 430 } 431 432 433 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) 434 { 435 acpi_handle dummy_handle; 436 437 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 438 "_STA", &dummy_handle))) 439 bridge->flags |= BRIDGE_HAS_STA; 440 441 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 442 "_EJ0", &dummy_handle))) 443 bridge->flags |= BRIDGE_HAS_EJ0; 444 445 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 446 "_PS0", &dummy_handle))) 447 bridge->flags |= BRIDGE_HAS_PS0; 448 449 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 450 "_PS3", &dummy_handle))) 451 bridge->flags |= BRIDGE_HAS_PS3; 452 453 /* is this ejectable p2p bridge? */ 454 if (bridge->flags & BRIDGE_HAS_EJ0) { 455 struct acpiphp_func *func; 456 457 dbg("found ejectable p2p bridge\n"); 458 459 /* make link between PCI bridge and PCI function */ 460 func = acpiphp_bridge_handle_to_function(bridge->handle); 461 if (!func) 462 return; 463 bridge->func = func; 464 func->bridge = bridge; 465 } 466 } 467 468 469 /* allocate and initialize host bridge data structure */ 470 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus) 471 { 472 struct acpiphp_bridge *bridge; 473 474 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 475 if (bridge == NULL) 476 return; 477 478 bridge->type = BRIDGE_TYPE_HOST; 479 bridge->handle = handle; 480 481 bridge->pci_bus = pci_bus; 482 483 spin_lock_init(&bridge->res_lock); 484 485 init_bridge_misc(bridge); 486 } 487 488 489 /* allocate and initialize PCI-to-PCI bridge data structure */ 490 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev) 491 { 492 struct acpiphp_bridge *bridge; 493 494 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 495 if (bridge == NULL) { 496 err("out of memory\n"); 497 return; 498 } 499 500 bridge->type = BRIDGE_TYPE_P2P; 501 bridge->handle = handle; 502 config_p2p_bridge_flags(bridge); 503 504 bridge->pci_dev = pci_dev_get(pci_dev); 505 bridge->pci_bus = pci_dev->subordinate; 506 if (!bridge->pci_bus) { 507 err("This is not a PCI-to-PCI bridge!\n"); 508 goto err; 509 } 510 511 spin_lock_init(&bridge->res_lock); 512 513 init_bridge_misc(bridge); 514 return; 515 err: 516 pci_dev_put(pci_dev); 517 kfree(bridge); 518 return; 519 } 520 521 522 /* callback routine to find P2P bridges */ 523 static acpi_status 524 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 525 { 526 acpi_status status; 527 acpi_handle dummy_handle; 528 unsigned long tmp; 529 int device, function; 530 struct pci_dev *dev; 531 struct pci_bus *pci_bus = context; 532 533 status = acpi_get_handle(handle, "_ADR", &dummy_handle); 534 if (ACPI_FAILURE(status)) 535 return AE_OK; /* continue */ 536 537 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); 538 if (ACPI_FAILURE(status)) { 539 dbg("%s: _ADR evaluation failure\n", __FUNCTION__); 540 return AE_OK; 541 } 542 543 device = (tmp >> 16) & 0xffff; 544 function = tmp & 0xffff; 545 546 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); 547 548 if (!dev || !dev->subordinate) 549 goto out; 550 551 /* check if this bridge has ejectable slots */ 552 if ((detect_ejectable_slots(handle) > 0)) { 553 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 554 add_p2p_bridge(handle, dev); 555 } 556 557 /* search P2P bridges under this p2p bridge */ 558 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 559 find_p2p_bridge, dev->subordinate, NULL); 560 if (ACPI_FAILURE(status)) 561 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 562 563 out: 564 pci_dev_put(dev); 565 return AE_OK; 566 } 567 568 569 /* find hot-pluggable slots, and then find P2P bridge */ 570 static int add_bridge(acpi_handle handle) 571 { 572 acpi_status status; 573 unsigned long tmp; 574 int seg, bus; 575 acpi_handle dummy_handle; 576 struct pci_bus *pci_bus; 577 578 /* if the bridge doesn't have _STA, we assume it is always there */ 579 status = acpi_get_handle(handle, "_STA", &dummy_handle); 580 if (ACPI_SUCCESS(status)) { 581 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 582 if (ACPI_FAILURE(status)) { 583 dbg("%s: _STA evaluation failure\n", __FUNCTION__); 584 return 0; 585 } 586 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 587 /* don't register this object */ 588 return 0; 589 } 590 591 /* get PCI segment number */ 592 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); 593 594 seg = ACPI_SUCCESS(status) ? tmp : 0; 595 596 /* get PCI bus number */ 597 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); 598 599 if (ACPI_SUCCESS(status)) { 600 bus = tmp; 601 } else { 602 warn("can't get bus number, assuming 0\n"); 603 bus = 0; 604 } 605 606 pci_bus = pci_find_bus(seg, bus); 607 if (!pci_bus) { 608 err("Can't find bus %04x:%02x\n", seg, bus); 609 return 0; 610 } 611 612 /* check if this bridge has ejectable slots */ 613 if (detect_ejectable_slots(handle) > 0) { 614 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 615 add_host_bridge(handle, pci_bus); 616 } 617 618 /* search P2P bridges under this host bridge */ 619 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 620 find_p2p_bridge, pci_bus, NULL); 621 622 if (ACPI_FAILURE(status)) 623 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 624 625 return 0; 626 } 627 628 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 629 { 630 struct list_head *head; 631 list_for_each(head, &bridge_list) { 632 struct acpiphp_bridge *bridge = list_entry(head, 633 struct acpiphp_bridge, list); 634 if (bridge->handle == handle) 635 return bridge; 636 } 637 638 return NULL; 639 } 640 641 static void cleanup_bridge(struct acpiphp_bridge *bridge) 642 { 643 struct list_head *list, *tmp; 644 struct acpiphp_slot *slot; 645 acpi_status status; 646 acpi_handle handle = bridge->handle; 647 648 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 649 handle_hotplug_event_bridge); 650 if (ACPI_FAILURE(status)) 651 err("failed to remove notify handler\n"); 652 653 if ((bridge->type != BRIDGE_TYPE_HOST) && 654 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 655 status = acpi_install_notify_handler(bridge->func->handle, 656 ACPI_SYSTEM_NOTIFY, 657 handle_hotplug_event_func, 658 bridge->func); 659 if (ACPI_FAILURE(status)) 660 err("failed to install interrupt notify handler\n"); 661 } 662 663 slot = bridge->slots; 664 while (slot) { 665 struct acpiphp_slot *next = slot->next; 666 list_for_each_safe (list, tmp, &slot->funcs) { 667 struct acpiphp_func *func; 668 func = list_entry(list, struct acpiphp_func, sibling); 669 if (is_dock_device(func->handle)) { 670 unregister_hotplug_dock_device(func->handle); 671 unregister_dock_notifier(&func->nb); 672 } 673 if (!(func->flags & FUNC_HAS_DCK)) { 674 status = acpi_remove_notify_handler(func->handle, 675 ACPI_SYSTEM_NOTIFY, 676 handle_hotplug_event_func); 677 if (ACPI_FAILURE(status)) 678 err("failed to remove notify handler\n"); 679 } 680 pci_dev_put(func->pci_dev); 681 list_del(list); 682 kfree(func); 683 } 684 acpiphp_unregister_hotplug_slot(slot); 685 list_del(&slot->funcs); 686 kfree(slot); 687 slot = next; 688 } 689 690 pci_dev_put(bridge->pci_dev); 691 list_del(&bridge->list); 692 kfree(bridge); 693 } 694 695 static acpi_status 696 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 697 { 698 struct acpiphp_bridge *bridge; 699 700 /* cleanup p2p bridges under this P2P bridge 701 in a depth-first manner */ 702 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 703 cleanup_p2p_bridge, NULL, NULL); 704 705 if (!(bridge = acpiphp_handle_to_bridge(handle))) 706 return AE_OK; 707 cleanup_bridge(bridge); 708 return AE_OK; 709 } 710 711 static void remove_bridge(acpi_handle handle) 712 { 713 struct acpiphp_bridge *bridge; 714 715 /* cleanup p2p bridges under this host bridge 716 in a depth-first manner */ 717 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 718 (u32)1, cleanup_p2p_bridge, NULL, NULL); 719 720 bridge = acpiphp_handle_to_bridge(handle); 721 if (bridge) 722 cleanup_bridge(bridge); 723 } 724 725 static struct pci_dev * get_apic_pci_info(acpi_handle handle) 726 { 727 struct acpi_pci_id id; 728 struct pci_bus *bus; 729 struct pci_dev *dev; 730 731 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) 732 return NULL; 733 734 bus = pci_find_bus(id.segment, id.bus); 735 if (!bus) 736 return NULL; 737 738 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); 739 if (!dev) 740 return NULL; 741 742 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && 743 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) 744 { 745 pci_dev_put(dev); 746 return NULL; 747 } 748 749 return dev; 750 } 751 752 static int get_gsi_base(acpi_handle handle, u32 *gsi_base) 753 { 754 acpi_status status; 755 int result = -1; 756 unsigned long gsb; 757 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 758 union acpi_object *obj; 759 void *table; 760 761 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); 762 if (ACPI_SUCCESS(status)) { 763 *gsi_base = (u32)gsb; 764 return 0; 765 } 766 767 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); 768 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) 769 return -1; 770 771 obj = buffer.pointer; 772 if (obj->type != ACPI_TYPE_BUFFER) 773 goto out; 774 775 table = obj->buffer.pointer; 776 switch (((struct acpi_subtable_header *)table)->type) { 777 case ACPI_MADT_TYPE_IO_SAPIC: 778 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base; 779 result = 0; 780 break; 781 case ACPI_MADT_TYPE_IO_APIC: 782 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base; 783 result = 0; 784 break; 785 default: 786 break; 787 } 788 out: 789 kfree(buffer.pointer); 790 return result; 791 } 792 793 static acpi_status 794 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) 795 { 796 acpi_status status; 797 unsigned long sta; 798 acpi_handle tmp; 799 struct pci_dev *pdev; 800 u32 gsi_base; 801 u64 phys_addr; 802 struct acpiphp_ioapic *ioapic; 803 804 /* Evaluate _STA if present */ 805 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 806 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 807 return AE_CTRL_DEPTH; 808 809 /* Scan only PCI bus scope */ 810 status = acpi_get_handle(handle, "_HID", &tmp); 811 if (ACPI_SUCCESS(status)) 812 return AE_CTRL_DEPTH; 813 814 if (get_gsi_base(handle, &gsi_base)) 815 return AE_OK; 816 817 ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL); 818 if (!ioapic) 819 return AE_NO_MEMORY; 820 821 pdev = get_apic_pci_info(handle); 822 if (!pdev) 823 goto exit_kfree; 824 825 if (pci_enable_device(pdev)) 826 goto exit_pci_dev_put; 827 828 pci_set_master(pdev); 829 830 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) 831 goto exit_pci_disable_device; 832 833 phys_addr = pci_resource_start(pdev, 0); 834 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) 835 goto exit_pci_release_region; 836 837 ioapic->gsi_base = gsi_base; 838 ioapic->dev = pdev; 839 spin_lock(&ioapic_list_lock); 840 list_add_tail(&ioapic->list, &ioapic_list); 841 spin_unlock(&ioapic_list_lock); 842 843 return AE_OK; 844 845 exit_pci_release_region: 846 pci_release_region(pdev, 0); 847 exit_pci_disable_device: 848 pci_disable_device(pdev); 849 exit_pci_dev_put: 850 pci_dev_put(pdev); 851 exit_kfree: 852 kfree(ioapic); 853 854 return AE_OK; 855 } 856 857 static acpi_status 858 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv) 859 { 860 acpi_status status; 861 unsigned long sta; 862 acpi_handle tmp; 863 u32 gsi_base; 864 struct acpiphp_ioapic *pos, *n, *ioapic = NULL; 865 866 /* Evaluate _STA if present */ 867 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 868 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 869 return AE_CTRL_DEPTH; 870 871 /* Scan only PCI bus scope */ 872 status = acpi_get_handle(handle, "_HID", &tmp); 873 if (ACPI_SUCCESS(status)) 874 return AE_CTRL_DEPTH; 875 876 if (get_gsi_base(handle, &gsi_base)) 877 return AE_OK; 878 879 acpi_unregister_ioapic(handle, gsi_base); 880 881 spin_lock(&ioapic_list_lock); 882 list_for_each_entry_safe(pos, n, &ioapic_list, list) { 883 if (pos->gsi_base != gsi_base) 884 continue; 885 ioapic = pos; 886 list_del(&ioapic->list); 887 break; 888 } 889 spin_unlock(&ioapic_list_lock); 890 891 if (!ioapic) 892 return AE_OK; 893 894 pci_release_region(ioapic->dev, 0); 895 pci_disable_device(ioapic->dev); 896 pci_dev_put(ioapic->dev); 897 kfree(ioapic); 898 899 return AE_OK; 900 } 901 902 static int acpiphp_configure_ioapics(acpi_handle handle) 903 { 904 ioapic_add(handle, 0, NULL, NULL); 905 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 906 ACPI_UINT32_MAX, ioapic_add, NULL, NULL); 907 return 0; 908 } 909 910 static int acpiphp_unconfigure_ioapics(acpi_handle handle) 911 { 912 ioapic_remove(handle, 0, NULL, NULL); 913 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 914 ACPI_UINT32_MAX, ioapic_remove, NULL, NULL); 915 return 0; 916 } 917 918 static int power_on_slot(struct acpiphp_slot *slot) 919 { 920 acpi_status status; 921 struct acpiphp_func *func; 922 struct list_head *l; 923 int retval = 0; 924 925 /* if already enabled, just skip */ 926 if (slot->flags & SLOT_POWEREDON) 927 goto err_exit; 928 929 list_for_each (l, &slot->funcs) { 930 func = list_entry(l, struct acpiphp_func, sibling); 931 932 if (func->flags & FUNC_HAS_PS0) { 933 dbg("%s: executing _PS0\n", __FUNCTION__); 934 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 935 if (ACPI_FAILURE(status)) { 936 warn("%s: _PS0 failed\n", __FUNCTION__); 937 retval = -1; 938 goto err_exit; 939 } else 940 break; 941 } 942 } 943 944 /* TBD: evaluate _STA to check if the slot is enabled */ 945 946 slot->flags |= SLOT_POWEREDON; 947 948 err_exit: 949 return retval; 950 } 951 952 953 static int power_off_slot(struct acpiphp_slot *slot) 954 { 955 acpi_status status; 956 struct acpiphp_func *func; 957 struct list_head *l; 958 959 int retval = 0; 960 961 /* if already disabled, just skip */ 962 if ((slot->flags & SLOT_POWEREDON) == 0) 963 goto err_exit; 964 965 list_for_each (l, &slot->funcs) { 966 func = list_entry(l, struct acpiphp_func, sibling); 967 968 if (func->flags & FUNC_HAS_PS3) { 969 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 970 if (ACPI_FAILURE(status)) { 971 warn("%s: _PS3 failed\n", __FUNCTION__); 972 retval = -1; 973 goto err_exit; 974 } else 975 break; 976 } 977 } 978 979 /* TBD: evaluate _STA to check if the slot is disabled */ 980 981 slot->flags &= (~SLOT_POWEREDON); 982 983 err_exit: 984 return retval; 985 } 986 987 988 989 /** 990 * acpiphp_max_busnr - return the highest reserved bus number under 991 * the given bus. 992 * @bus: bus to start search with 993 * 994 */ 995 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 996 { 997 struct list_head *tmp; 998 unsigned char max, n; 999 1000 /* 1001 * pci_bus_max_busnr will return the highest 1002 * reserved busnr for all these children. 1003 * that is equivalent to the bus->subordinate 1004 * value. We don't want to use the parent's 1005 * bus->subordinate value because it could have 1006 * padding in it. 1007 */ 1008 max = bus->secondary; 1009 1010 list_for_each(tmp, &bus->children) { 1011 n = pci_bus_max_busnr(pci_bus_b(tmp)); 1012 if (n > max) 1013 max = n; 1014 } 1015 return max; 1016 } 1017 1018 1019 /** 1020 * acpiphp_bus_add - add a new bus to acpi subsystem 1021 * @func: acpiphp_func of the bridge 1022 * 1023 */ 1024 static int acpiphp_bus_add(struct acpiphp_func *func) 1025 { 1026 acpi_handle phandle; 1027 struct acpi_device *device, *pdevice; 1028 int ret_val; 1029 1030 acpi_get_parent(func->handle, &phandle); 1031 if (acpi_bus_get_device(phandle, &pdevice)) { 1032 dbg("no parent device, assuming NULL\n"); 1033 pdevice = NULL; 1034 } 1035 if (!acpi_bus_get_device(func->handle, &device)) { 1036 dbg("bus exists... trim\n"); 1037 /* this shouldn't be in here, so remove 1038 * the bus then re-add it... 1039 */ 1040 ret_val = acpi_bus_trim(device, 1); 1041 dbg("acpi_bus_trim return %x\n", ret_val); 1042 } 1043 1044 ret_val = acpi_bus_add(&device, pdevice, func->handle, 1045 ACPI_BUS_TYPE_DEVICE); 1046 if (ret_val) { 1047 dbg("error adding bus, %x\n", 1048 -ret_val); 1049 goto acpiphp_bus_add_out; 1050 } 1051 /* 1052 * try to start anyway. We could have failed to add 1053 * simply because this bus had previously been added 1054 * on another add. Don't bother with the return value 1055 * we just keep going. 1056 */ 1057 ret_val = acpi_bus_start(device); 1058 1059 acpiphp_bus_add_out: 1060 return ret_val; 1061 } 1062 1063 1064 /** 1065 * acpiphp_bus_trim - trim a bus from acpi subsystem 1066 * @handle: handle to acpi namespace 1067 * 1068 */ 1069 static int acpiphp_bus_trim(acpi_handle handle) 1070 { 1071 struct acpi_device *device; 1072 int retval; 1073 1074 retval = acpi_bus_get_device(handle, &device); 1075 if (retval) { 1076 dbg("acpi_device not found\n"); 1077 return retval; 1078 } 1079 1080 retval = acpi_bus_trim(device, 1); 1081 if (retval) 1082 err("cannot remove from acpi list\n"); 1083 1084 return retval; 1085 } 1086 1087 /** 1088 * enable_device - enable, configure a slot 1089 * @slot: slot to be enabled 1090 * 1091 * This function should be called per *physical slot*, 1092 * not per each slot object in ACPI namespace. 1093 * 1094 */ 1095 static int enable_device(struct acpiphp_slot *slot) 1096 { 1097 struct pci_dev *dev; 1098 struct pci_bus *bus = slot->bridge->pci_bus; 1099 struct list_head *l; 1100 struct acpiphp_func *func; 1101 int retval = 0; 1102 int num, max, pass; 1103 acpi_status status; 1104 1105 if (slot->flags & SLOT_ENABLED) 1106 goto err_exit; 1107 1108 /* sanity check: dev should be NULL when hot-plugged in */ 1109 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 1110 if (dev) { 1111 /* This case shouldn't happen */ 1112 err("pci_dev structure already exists.\n"); 1113 pci_dev_put(dev); 1114 retval = -1; 1115 goto err_exit; 1116 } 1117 1118 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 1119 if (num == 0) { 1120 err("No new device found\n"); 1121 retval = -1; 1122 goto err_exit; 1123 } 1124 1125 max = acpiphp_max_busnr(bus); 1126 for (pass = 0; pass < 2; pass++) { 1127 list_for_each_entry(dev, &bus->devices, bus_list) { 1128 if (PCI_SLOT(dev->devfn) != slot->device) 1129 continue; 1130 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 1131 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 1132 max = pci_scan_bridge(bus, dev, max, pass); 1133 if (pass && dev->subordinate) 1134 pci_bus_size_bridges(dev->subordinate); 1135 } 1136 } 1137 } 1138 1139 list_for_each (l, &slot->funcs) { 1140 func = list_entry(l, struct acpiphp_func, sibling); 1141 acpiphp_bus_add(func); 1142 } 1143 1144 pci_bus_assign_resources(bus); 1145 acpiphp_sanitize_bus(bus); 1146 acpiphp_set_hpp_values(slot->bridge->handle, bus); 1147 list_for_each_entry(func, &slot->funcs, sibling) 1148 acpiphp_configure_ioapics(func->handle); 1149 pci_enable_bridges(bus); 1150 pci_bus_add_devices(bus); 1151 1152 /* associate pci_dev to our representation */ 1153 list_for_each (l, &slot->funcs) { 1154 func = list_entry(l, struct acpiphp_func, sibling); 1155 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 1156 func->function)); 1157 if (!func->pci_dev) 1158 continue; 1159 1160 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 1161 func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) 1162 continue; 1163 1164 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 1165 if (ACPI_FAILURE(status)) 1166 warn("find_p2p_bridge failed (error code = 0x%x)\n", 1167 status); 1168 } 1169 1170 slot->flags |= SLOT_ENABLED; 1171 1172 err_exit: 1173 return retval; 1174 } 1175 1176 static void disable_bridges(struct pci_bus *bus) 1177 { 1178 struct pci_dev *dev; 1179 list_for_each_entry(dev, &bus->devices, bus_list) { 1180 if (dev->subordinate) { 1181 disable_bridges(dev->subordinate); 1182 pci_disable_device(dev); 1183 } 1184 } 1185 } 1186 1187 /** 1188 * disable_device - disable a slot 1189 */ 1190 static int disable_device(struct acpiphp_slot *slot) 1191 { 1192 int retval = 0; 1193 struct acpiphp_func *func; 1194 struct list_head *l; 1195 1196 /* is this slot already disabled? */ 1197 if (!(slot->flags & SLOT_ENABLED)) 1198 goto err_exit; 1199 1200 list_for_each (l, &slot->funcs) { 1201 func = list_entry(l, struct acpiphp_func, sibling); 1202 1203 if (func->bridge) { 1204 /* cleanup p2p bridges under this P2P bridge */ 1205 cleanup_p2p_bridge(func->bridge->handle, 1206 (u32)1, NULL, NULL); 1207 func->bridge = NULL; 1208 } 1209 1210 if (func->pci_dev) { 1211 pci_stop_bus_device(func->pci_dev); 1212 if (func->pci_dev->subordinate) { 1213 disable_bridges(func->pci_dev->subordinate); 1214 pci_disable_device(func->pci_dev); 1215 } 1216 } 1217 } 1218 1219 list_for_each (l, &slot->funcs) { 1220 func = list_entry(l, struct acpiphp_func, sibling); 1221 1222 acpiphp_unconfigure_ioapics(func->handle); 1223 acpiphp_bus_trim(func->handle); 1224 /* try to remove anyway. 1225 * acpiphp_bus_add might have been failed */ 1226 1227 if (!func->pci_dev) 1228 continue; 1229 1230 pci_remove_bus_device(func->pci_dev); 1231 pci_dev_put(func->pci_dev); 1232 func->pci_dev = NULL; 1233 } 1234 1235 slot->flags &= (~SLOT_ENABLED); 1236 1237 err_exit: 1238 return retval; 1239 } 1240 1241 1242 /** 1243 * get_slot_status - get ACPI slot status 1244 * 1245 * if a slot has _STA for each function and if any one of them 1246 * returned non-zero status, return it 1247 * 1248 * if a slot doesn't have _STA and if any one of its functions' 1249 * configuration space is configured, return 0x0f as a _STA 1250 * 1251 * otherwise return 0 1252 */ 1253 static unsigned int get_slot_status(struct acpiphp_slot *slot) 1254 { 1255 acpi_status status; 1256 unsigned long sta = 0; 1257 u32 dvid; 1258 struct list_head *l; 1259 struct acpiphp_func *func; 1260 1261 list_for_each (l, &slot->funcs) { 1262 func = list_entry(l, struct acpiphp_func, sibling); 1263 1264 if (func->flags & FUNC_HAS_STA) { 1265 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 1266 if (ACPI_SUCCESS(status) && sta) 1267 break; 1268 } else { 1269 pci_bus_read_config_dword(slot->bridge->pci_bus, 1270 PCI_DEVFN(slot->device, 1271 func->function), 1272 PCI_VENDOR_ID, &dvid); 1273 if (dvid != 0xffffffff) { 1274 sta = ACPI_STA_ALL; 1275 break; 1276 } 1277 } 1278 } 1279 1280 return (unsigned int)sta; 1281 } 1282 1283 /** 1284 * acpiphp_eject_slot - physically eject the slot 1285 */ 1286 static int acpiphp_eject_slot(struct acpiphp_slot *slot) 1287 { 1288 acpi_status status; 1289 struct acpiphp_func *func; 1290 struct list_head *l; 1291 struct acpi_object_list arg_list; 1292 union acpi_object arg; 1293 1294 list_for_each (l, &slot->funcs) { 1295 func = list_entry(l, struct acpiphp_func, sibling); 1296 1297 /* We don't want to call _EJ0 on non-existing functions. */ 1298 if ((func->flags & FUNC_HAS_EJ0)) { 1299 /* _EJ0 method take one argument */ 1300 arg_list.count = 1; 1301 arg_list.pointer = &arg; 1302 arg.type = ACPI_TYPE_INTEGER; 1303 arg.integer.value = 1; 1304 1305 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1306 if (ACPI_FAILURE(status)) { 1307 warn("%s: _EJ0 failed\n", __FUNCTION__); 1308 return -1; 1309 } else 1310 break; 1311 } 1312 } 1313 return 0; 1314 } 1315 1316 /** 1317 * acpiphp_check_bridge - re-enumerate devices 1318 * 1319 * Iterate over all slots under this bridge and make sure that if a 1320 * card is present they are enabled, and if not they are disabled. 1321 */ 1322 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1323 { 1324 struct acpiphp_slot *slot; 1325 int retval = 0; 1326 int enabled, disabled; 1327 1328 enabled = disabled = 0; 1329 1330 for (slot = bridge->slots; slot; slot = slot->next) { 1331 unsigned int status = get_slot_status(slot); 1332 if (slot->flags & SLOT_ENABLED) { 1333 if (status == ACPI_STA_ALL) 1334 continue; 1335 retval = acpiphp_disable_slot(slot); 1336 if (retval) { 1337 err("Error occurred in disabling\n"); 1338 goto err_exit; 1339 } else { 1340 acpiphp_eject_slot(slot); 1341 } 1342 disabled++; 1343 } else { 1344 if (status != ACPI_STA_ALL) 1345 continue; 1346 retval = acpiphp_enable_slot(slot); 1347 if (retval) { 1348 err("Error occurred in enabling\n"); 1349 goto err_exit; 1350 } 1351 enabled++; 1352 } 1353 } 1354 1355 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); 1356 1357 err_exit: 1358 return retval; 1359 } 1360 1361 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) 1362 { 1363 u16 pci_cmd, pci_bctl; 1364 struct pci_dev *cdev; 1365 1366 /* Program hpp values for this device */ 1367 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 1368 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 1369 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 1370 return; 1371 1372 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 1373 bridge->hpp.t0->cache_line_size); 1374 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 1375 bridge->hpp.t0->latency_timer); 1376 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 1377 if (bridge->hpp.t0->enable_serr) 1378 pci_cmd |= PCI_COMMAND_SERR; 1379 else 1380 pci_cmd &= ~PCI_COMMAND_SERR; 1381 if (bridge->hpp.t0->enable_perr) 1382 pci_cmd |= PCI_COMMAND_PARITY; 1383 else 1384 pci_cmd &= ~PCI_COMMAND_PARITY; 1385 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 1386 1387 /* Program bridge control value and child devices */ 1388 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 1389 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 1390 bridge->hpp.t0->latency_timer); 1391 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 1392 if (bridge->hpp.t0->enable_serr) 1393 pci_bctl |= PCI_BRIDGE_CTL_SERR; 1394 else 1395 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 1396 if (bridge->hpp.t0->enable_perr) 1397 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 1398 else 1399 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 1400 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 1401 if (dev->subordinate) { 1402 list_for_each_entry(cdev, &dev->subordinate->devices, 1403 bus_list) 1404 program_hpp(cdev, bridge); 1405 } 1406 } 1407 } 1408 1409 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) 1410 { 1411 struct acpiphp_bridge bridge; 1412 struct pci_dev *dev; 1413 1414 memset(&bridge, 0, sizeof(bridge)); 1415 bridge.handle = handle; 1416 bridge.pci_bus = bus; 1417 bridge.pci_dev = bus->self; 1418 decode_hpp(&bridge); 1419 list_for_each_entry(dev, &bus->devices, bus_list) 1420 program_hpp(dev, &bridge); 1421 1422 } 1423 1424 /* 1425 * Remove devices for which we could not assign resources, call 1426 * arch specific code to fix-up the bus 1427 */ 1428 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1429 { 1430 struct pci_dev *dev; 1431 int i; 1432 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1433 1434 list_for_each_entry(dev, &bus->devices, bus_list) { 1435 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1436 struct resource *res = &dev->resource[i]; 1437 if ((res->flags & type_mask) && !res->start && 1438 res->end) { 1439 /* Could not assign a required resources 1440 * for this device, remove it */ 1441 pci_remove_bus_device(dev); 1442 break; 1443 } 1444 } 1445 } 1446 } 1447 1448 /* Program resources in newly inserted bridge */ 1449 static int acpiphp_configure_bridge (acpi_handle handle) 1450 { 1451 struct acpi_pci_id pci_id; 1452 struct pci_bus *bus; 1453 1454 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { 1455 err("cannot get PCI domain and bus number for bridge\n"); 1456 return -EINVAL; 1457 } 1458 bus = pci_find_bus(pci_id.segment, pci_id.bus); 1459 if (!bus) { 1460 err("cannot find bus %d:%d\n", 1461 pci_id.segment, pci_id.bus); 1462 return -EINVAL; 1463 } 1464 1465 pci_bus_size_bridges(bus); 1466 pci_bus_assign_resources(bus); 1467 acpiphp_sanitize_bus(bus); 1468 acpiphp_set_hpp_values(handle, bus); 1469 pci_enable_bridges(bus); 1470 acpiphp_configure_ioapics(handle); 1471 return 0; 1472 } 1473 1474 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1475 { 1476 struct acpi_device *device, *pdevice; 1477 acpi_handle phandle; 1478 1479 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1480 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1481 err("unexpected notification type %d\n", type); 1482 return; 1483 } 1484 1485 acpi_get_parent(handle, &phandle); 1486 if (acpi_bus_get_device(phandle, &pdevice)) { 1487 dbg("no parent device, assuming NULL\n"); 1488 pdevice = NULL; 1489 } 1490 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1491 err("cannot add bridge to acpi list\n"); 1492 return; 1493 } 1494 if (!acpiphp_configure_bridge(handle) && 1495 !acpi_bus_start(device)) 1496 add_bridge(handle); 1497 else 1498 err("cannot configure and start bridge\n"); 1499 1500 } 1501 1502 /* 1503 * ACPI event handlers 1504 */ 1505 1506 /** 1507 * handle_hotplug_event_bridge - handle ACPI event on bridges 1508 * 1509 * @handle: Notify()'ed acpi_handle 1510 * @type: Notify code 1511 * @context: pointer to acpiphp_bridge structure 1512 * 1513 * handles ACPI event notification on {host,p2p} bridges 1514 * 1515 */ 1516 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) 1517 { 1518 struct acpiphp_bridge *bridge; 1519 char objname[64]; 1520 struct acpi_buffer buffer = { .length = sizeof(objname), 1521 .pointer = objname }; 1522 struct acpi_device *device; 1523 1524 if (acpi_bus_get_device(handle, &device)) { 1525 /* This bridge must have just been physically inserted */ 1526 handle_bridge_insertion(handle, type); 1527 return; 1528 } 1529 1530 bridge = acpiphp_handle_to_bridge(handle); 1531 if (!bridge) { 1532 err("cannot get bridge info\n"); 1533 return; 1534 } 1535 1536 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1537 1538 switch (type) { 1539 case ACPI_NOTIFY_BUS_CHECK: 1540 /* bus re-enumerate */ 1541 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1542 acpiphp_check_bridge(bridge); 1543 break; 1544 1545 case ACPI_NOTIFY_DEVICE_CHECK: 1546 /* device check */ 1547 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1548 acpiphp_check_bridge(bridge); 1549 break; 1550 1551 case ACPI_NOTIFY_DEVICE_WAKE: 1552 /* wake event */ 1553 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1554 break; 1555 1556 case ACPI_NOTIFY_EJECT_REQUEST: 1557 /* request device eject */ 1558 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1559 if ((bridge->type != BRIDGE_TYPE_HOST) && 1560 (bridge->flags & BRIDGE_HAS_EJ0)) { 1561 struct acpiphp_slot *slot; 1562 slot = bridge->func->slot; 1563 if (!acpiphp_disable_slot(slot)) 1564 acpiphp_eject_slot(slot); 1565 } 1566 break; 1567 1568 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1569 printk(KERN_ERR "Device %s cannot be configured due" 1570 " to a frequency mismatch\n", objname); 1571 break; 1572 1573 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1574 printk(KERN_ERR "Device %s cannot be configured due" 1575 " to a bus mode mismatch\n", objname); 1576 break; 1577 1578 case ACPI_NOTIFY_POWER_FAULT: 1579 printk(KERN_ERR "Device %s has suffered a power fault\n", 1580 objname); 1581 break; 1582 1583 default: 1584 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1585 break; 1586 } 1587 } 1588 1589 /** 1590 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1591 * 1592 * @handle: Notify()'ed acpi_handle 1593 * @type: Notify code 1594 * @context: pointer to acpiphp_func structure 1595 * 1596 * handles ACPI event notification on slots 1597 * 1598 */ 1599 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) 1600 { 1601 struct acpiphp_func *func; 1602 char objname[64]; 1603 struct acpi_buffer buffer = { .length = sizeof(objname), 1604 .pointer = objname }; 1605 1606 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1607 1608 func = (struct acpiphp_func *)context; 1609 1610 switch (type) { 1611 case ACPI_NOTIFY_BUS_CHECK: 1612 /* bus re-enumerate */ 1613 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1614 acpiphp_enable_slot(func->slot); 1615 break; 1616 1617 case ACPI_NOTIFY_DEVICE_CHECK: 1618 /* device check : re-enumerate from parent bus */ 1619 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1620 acpiphp_check_bridge(func->slot->bridge); 1621 break; 1622 1623 case ACPI_NOTIFY_DEVICE_WAKE: 1624 /* wake event */ 1625 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1626 break; 1627 1628 case ACPI_NOTIFY_EJECT_REQUEST: 1629 /* request device eject */ 1630 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1631 if (!(acpiphp_disable_slot(func->slot))) 1632 acpiphp_eject_slot(func->slot); 1633 break; 1634 1635 default: 1636 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1637 break; 1638 } 1639 } 1640 1641 1642 static acpi_status 1643 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1644 { 1645 int *count = (int *)context; 1646 1647 if (acpi_root_bridge(handle)) { 1648 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1649 handle_hotplug_event_bridge, NULL); 1650 (*count)++; 1651 } 1652 return AE_OK ; 1653 } 1654 1655 static struct acpi_pci_driver acpi_pci_hp_driver = { 1656 .add = add_bridge, 1657 .remove = remove_bridge, 1658 }; 1659 1660 /** 1661 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1662 * 1663 */ 1664 int __init acpiphp_glue_init(void) 1665 { 1666 int num = 0; 1667 1668 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1669 ACPI_UINT32_MAX, find_root_bridges, &num, NULL); 1670 1671 if (num <= 0) 1672 return -1; 1673 else 1674 acpi_pci_register_driver(&acpi_pci_hp_driver); 1675 1676 return 0; 1677 } 1678 1679 1680 /** 1681 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1682 * 1683 * This function frees all data allocated in acpiphp_glue_init() 1684 */ 1685 void acpiphp_glue_exit(void) 1686 { 1687 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1688 } 1689 1690 1691 /** 1692 * acpiphp_get_num_slots - count number of slots in a system 1693 */ 1694 int __init acpiphp_get_num_slots(void) 1695 { 1696 struct acpiphp_bridge *bridge; 1697 int num_slots = 0; 1698 1699 list_for_each_entry (bridge, &bridge_list, list) { 1700 dbg("Bus %04x:%02x has %d slot%s\n", 1701 pci_domain_nr(bridge->pci_bus), 1702 bridge->pci_bus->number, bridge->nr_slots, 1703 bridge->nr_slots == 1 ? "" : "s"); 1704 num_slots += bridge->nr_slots; 1705 } 1706 1707 dbg("Total %d slots\n", num_slots); 1708 return num_slots; 1709 } 1710 1711 1712 #if 0 1713 /** 1714 * acpiphp_for_each_slot - call function for each slot 1715 * @fn: callback function 1716 * @data: context to be passed to callback function 1717 * 1718 */ 1719 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1720 { 1721 struct list_head *node; 1722 struct acpiphp_bridge *bridge; 1723 struct acpiphp_slot *slot; 1724 int retval = 0; 1725 1726 list_for_each (node, &bridge_list) { 1727 bridge = (struct acpiphp_bridge *)node; 1728 for (slot = bridge->slots; slot; slot = slot->next) { 1729 retval = fn(slot, data); 1730 if (!retval) 1731 goto err_exit; 1732 } 1733 } 1734 1735 err_exit: 1736 return retval; 1737 } 1738 #endif 1739 1740 1741 /** 1742 * acpiphp_enable_slot - power on slot 1743 */ 1744 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1745 { 1746 int retval; 1747 1748 mutex_lock(&slot->crit_sect); 1749 1750 /* wake up all functions */ 1751 retval = power_on_slot(slot); 1752 if (retval) 1753 goto err_exit; 1754 1755 if (get_slot_status(slot) == ACPI_STA_ALL) { 1756 /* configure all functions */ 1757 retval = enable_device(slot); 1758 if (retval) 1759 power_off_slot(slot); 1760 } else { 1761 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__); 1762 power_off_slot(slot); 1763 } 1764 1765 err_exit: 1766 mutex_unlock(&slot->crit_sect); 1767 return retval; 1768 } 1769 1770 /** 1771 * acpiphp_disable_slot - power off slot 1772 */ 1773 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1774 { 1775 int retval = 0; 1776 1777 mutex_lock(&slot->crit_sect); 1778 1779 /* unconfigure all functions */ 1780 retval = disable_device(slot); 1781 if (retval) 1782 goto err_exit; 1783 1784 /* power off all functions */ 1785 retval = power_off_slot(slot); 1786 if (retval) 1787 goto err_exit; 1788 1789 err_exit: 1790 mutex_unlock(&slot->crit_sect); 1791 return retval; 1792 } 1793 1794 1795 /* 1796 * slot enabled: 1 1797 * slot disabled: 0 1798 */ 1799 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1800 { 1801 return (slot->flags & SLOT_POWEREDON); 1802 } 1803 1804 1805 /* 1806 * latch open: 1 1807 * latch closed: 0 1808 */ 1809 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1810 { 1811 unsigned int sta; 1812 1813 sta = get_slot_status(slot); 1814 1815 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1816 } 1817 1818 1819 /* 1820 * adapter presence : 1 1821 * absence : 0 1822 */ 1823 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1824 { 1825 unsigned int sta; 1826 1827 sta = get_slot_status(slot); 1828 1829 return (sta == 0) ? 0 : 1; 1830 } 1831 1832 1833 /* 1834 * pci address (seg/bus/dev) 1835 */ 1836 u32 acpiphp_get_address(struct acpiphp_slot *slot) 1837 { 1838 u32 address; 1839 struct pci_bus *pci_bus = slot->bridge->pci_bus; 1840 1841 address = (pci_domain_nr(pci_bus) << 16) | 1842 (pci_bus->number << 8) | 1843 slot->device; 1844 1845 return address; 1846 } 1847