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/mutex.h> 50 51 #include "../pci.h" 52 #include "acpiphp.h" 53 54 static LIST_HEAD(bridge_list); 55 static LIST_HEAD(ioapic_list); 56 static DEFINE_SPINLOCK(ioapic_list_lock); 57 58 #define MY_NAME "acpiphp_glue" 59 60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *); 61 static void acpiphp_sanitize_bus(struct pci_bus *bus); 62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus); 63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); 64 65 66 /* 67 * initialization & terminatation routines 68 */ 69 70 /** 71 * is_ejectable - determine if a slot is ejectable 72 * @handle: handle to acpi namespace 73 * 74 * Ejectable slot should satisfy at least these conditions: 75 * 76 * 1. has _ADR method 77 * 2. has _EJ0 method 78 * 79 * optionally 80 * 81 * 1. has _STA method 82 * 2. has _PS0 method 83 * 3. has _PS3 method 84 * 4. .. 85 */ 86 static int is_ejectable(acpi_handle handle) 87 { 88 acpi_status status; 89 acpi_handle tmp; 90 91 status = acpi_get_handle(handle, "_ADR", &tmp); 92 if (ACPI_FAILURE(status)) { 93 return 0; 94 } 95 96 status = acpi_get_handle(handle, "_EJ0", &tmp); 97 if (ACPI_FAILURE(status)) { 98 return 0; 99 } 100 101 return 1; 102 } 103 104 105 /* callback routine to check for the existence of ejectable slots */ 106 static acpi_status 107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 108 { 109 int *count = (int *)context; 110 111 if (is_ejectable(handle)) { 112 (*count)++; 113 /* only one ejectable slot is enough */ 114 return AE_CTRL_TERMINATE; 115 } else { 116 return AE_OK; 117 } 118 } 119 120 /* callback routine to check for the existence of a pci dock device */ 121 static acpi_status 122 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) 123 { 124 int *count = (int *)context; 125 126 if (is_dock_device(handle)) { 127 (*count)++; 128 return AE_CTRL_TERMINATE; 129 } else { 130 return AE_OK; 131 } 132 } 133 134 135 136 137 /* 138 * the _DCK method can do funny things... and sometimes not 139 * hah-hah funny. 140 * 141 * TBD - figure out a way to only call fixups for 142 * systems that require them. 143 */ 144 static int post_dock_fixups(struct notifier_block *nb, unsigned long val, 145 void *v) 146 { 147 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); 148 struct pci_bus *bus = func->slot->bridge->pci_bus; 149 u32 buses; 150 151 if (!bus->self) 152 return NOTIFY_OK; 153 154 /* fixup bad _DCK function that rewrites 155 * secondary bridge on slot 156 */ 157 pci_read_config_dword(bus->self, 158 PCI_PRIMARY_BUS, 159 &buses); 160 161 if (((buses >> 8) & 0xff) != bus->secondary) { 162 buses = (buses & 0xff000000) 163 | ((unsigned int)(bus->primary) << 0) 164 | ((unsigned int)(bus->secondary) << 8) 165 | ((unsigned int)(bus->subordinate) << 16); 166 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 167 } 168 return NOTIFY_OK; 169 } 170 171 172 173 174 /* callback routine to register each ACPI PCI slot object */ 175 static acpi_status 176 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 177 { 178 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 179 struct acpiphp_slot *slot; 180 struct acpiphp_func *newfunc; 181 acpi_handle tmp; 182 acpi_status status = AE_OK; 183 unsigned long adr, sun; 184 int device, function, retval; 185 186 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 187 188 if (ACPI_FAILURE(status)) 189 return AE_OK; 190 191 status = acpi_get_handle(handle, "_EJ0", &tmp); 192 193 if (ACPI_FAILURE(status) && !(is_dock_device(handle))) 194 return AE_OK; 195 196 device = (adr >> 16) & 0xffff; 197 function = adr & 0xffff; 198 199 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 200 if (!newfunc) 201 return AE_NO_MEMORY; 202 203 INIT_LIST_HEAD(&newfunc->sibling); 204 newfunc->handle = handle; 205 newfunc->function = function; 206 if (ACPI_SUCCESS(status)) 207 newfunc->flags = FUNC_HAS_EJ0; 208 209 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 210 newfunc->flags |= FUNC_HAS_STA; 211 212 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 213 newfunc->flags |= FUNC_HAS_PS0; 214 215 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 216 newfunc->flags |= FUNC_HAS_PS3; 217 218 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 219 newfunc->flags |= FUNC_HAS_DCK; 220 221 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 222 if (ACPI_FAILURE(status)) { 223 /* 224 * use the count of the number of slots we've found 225 * for the number of the slot 226 */ 227 sun = bridge->nr_slots+1; 228 } 229 230 /* search for objects that share the same slot */ 231 for (slot = bridge->slots; slot; slot = slot->next) 232 if (slot->device == device) { 233 if (slot->sun != sun) 234 warn("sibling found, but _SUN doesn't match!\n"); 235 break; 236 } 237 238 if (!slot) { 239 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 240 if (!slot) { 241 kfree(newfunc); 242 return AE_NO_MEMORY; 243 } 244 245 slot->bridge = bridge; 246 slot->device = device; 247 slot->sun = sun; 248 INIT_LIST_HEAD(&slot->funcs); 249 mutex_init(&slot->crit_sect); 250 251 slot->next = bridge->slots; 252 bridge->slots = slot; 253 254 bridge->nr_slots++; 255 256 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n", 257 slot->sun, pci_domain_nr(bridge->pci_bus), 258 bridge->pci_bus->number, slot->device); 259 retval = acpiphp_register_hotplug_slot(slot); 260 if (retval) { 261 warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval); 262 goto err_exit; 263 } 264 } 265 266 newfunc->slot = slot; 267 list_add_tail(&newfunc->sibling, &slot->funcs); 268 269 /* associate corresponding pci_dev */ 270 newfunc->pci_dev = pci_get_slot(bridge->pci_bus, 271 PCI_DEVFN(device, function)); 272 if (newfunc->pci_dev) { 273 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 274 } 275 276 if (is_dock_device(handle)) { 277 /* we don't want to call this device's _EJ0 278 * because we want the dock notify handler 279 * to call it after it calls _DCK 280 */ 281 newfunc->flags &= ~FUNC_HAS_EJ0; 282 if (register_hotplug_dock_device(handle, 283 handle_hotplug_event_func, newfunc)) 284 dbg("failed to register dock device\n"); 285 286 /* we need to be notified when dock events happen 287 * outside of the hotplug operation, since we may 288 * need to do fixups before we can hotplug. 289 */ 290 newfunc->nb.notifier_call = post_dock_fixups; 291 if (register_dock_notifier(&newfunc->nb)) 292 dbg("failed to register a dock notifier"); 293 } 294 295 /* install notify handler */ 296 if (!(newfunc->flags & FUNC_HAS_DCK)) { 297 status = acpi_install_notify_handler(handle, 298 ACPI_SYSTEM_NOTIFY, 299 handle_hotplug_event_func, 300 newfunc); 301 302 if (ACPI_FAILURE(status)) 303 err("failed to register interrupt notify handler\n"); 304 } else 305 status = AE_OK; 306 307 return status; 308 309 err_exit: 310 bridge->nr_slots--; 311 bridge->slots = slot->next; 312 kfree(slot); 313 kfree(newfunc); 314 315 return AE_OK; 316 } 317 318 319 /* see if it's worth looking at this bridge */ 320 static int detect_ejectable_slots(acpi_handle *bridge_handle) 321 { 322 acpi_status status; 323 int count; 324 325 count = 0; 326 327 /* only check slots defined directly below bridge object */ 328 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, 329 is_ejectable_slot, (void *)&count, NULL); 330 331 /* 332 * we also need to add this bridge if there is a dock bridge or 333 * other pci device on a dock station (removable) 334 */ 335 if (!count) 336 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, 337 (u32)1, is_pci_dock_device, (void *)&count, 338 NULL); 339 340 return count; 341 } 342 343 344 /* decode ACPI 2.0 _HPP hot plug parameters */ 345 static void decode_hpp(struct acpiphp_bridge *bridge) 346 { 347 acpi_status status; 348 349 status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp); 350 if (ACPI_FAILURE(status) || 351 !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) { 352 /* use default numbers */ 353 printk(KERN_WARNING 354 "%s: Could not get hotplug parameters. Use defaults\n", 355 __FUNCTION__); 356 bridge->hpp.t0 = &bridge->hpp.type0_data; 357 bridge->hpp.t0->revision = 0; 358 bridge->hpp.t0->cache_line_size = 0x10; 359 bridge->hpp.t0->latency_timer = 0x40; 360 bridge->hpp.t0->enable_serr = 0; 361 bridge->hpp.t0->enable_perr = 0; 362 } 363 } 364 365 366 367 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 368 static void init_bridge_misc(struct acpiphp_bridge *bridge) 369 { 370 acpi_status status; 371 372 /* decode ACPI 2.0 _HPP (hot plug parameters) */ 373 decode_hpp(bridge); 374 375 /* must be added to the list prior to calling register_slot */ 376 list_add(&bridge->list, &bridge_list); 377 378 /* register all slot objects under this bridge */ 379 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 380 register_slot, bridge, NULL); 381 if (ACPI_FAILURE(status)) { 382 list_del(&bridge->list); 383 return; 384 } 385 386 /* install notify handler */ 387 if (bridge->type != BRIDGE_TYPE_HOST) { 388 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 389 status = acpi_remove_notify_handler(bridge->func->handle, 390 ACPI_SYSTEM_NOTIFY, 391 handle_hotplug_event_func); 392 if (ACPI_FAILURE(status)) 393 err("failed to remove notify handler\n"); 394 } 395 status = acpi_install_notify_handler(bridge->handle, 396 ACPI_SYSTEM_NOTIFY, 397 handle_hotplug_event_bridge, 398 bridge); 399 400 if (ACPI_FAILURE(status)) { 401 err("failed to register interrupt notify handler\n"); 402 } 403 } 404 } 405 406 407 /* find acpiphp_func from acpiphp_bridge */ 408 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 409 { 410 struct list_head *node, *l; 411 struct acpiphp_bridge *bridge; 412 struct acpiphp_slot *slot; 413 struct acpiphp_func *func; 414 415 list_for_each(node, &bridge_list) { 416 bridge = list_entry(node, struct acpiphp_bridge, list); 417 for (slot = bridge->slots; slot; slot = slot->next) { 418 list_for_each(l, &slot->funcs) { 419 func = list_entry(l, struct acpiphp_func, 420 sibling); 421 if (func->handle == handle) 422 return func; 423 } 424 } 425 } 426 427 return NULL; 428 } 429 430 431 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) 432 { 433 acpi_handle dummy_handle; 434 435 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 436 "_STA", &dummy_handle))) 437 bridge->flags |= BRIDGE_HAS_STA; 438 439 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 440 "_EJ0", &dummy_handle))) 441 bridge->flags |= BRIDGE_HAS_EJ0; 442 443 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 444 "_PS0", &dummy_handle))) 445 bridge->flags |= BRIDGE_HAS_PS0; 446 447 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 448 "_PS3", &dummy_handle))) 449 bridge->flags |= BRIDGE_HAS_PS3; 450 451 /* is this ejectable p2p bridge? */ 452 if (bridge->flags & BRIDGE_HAS_EJ0) { 453 struct acpiphp_func *func; 454 455 dbg("found ejectable p2p bridge\n"); 456 457 /* make link between PCI bridge and PCI function */ 458 func = acpiphp_bridge_handle_to_function(bridge->handle); 459 if (!func) 460 return; 461 bridge->func = func; 462 func->bridge = bridge; 463 } 464 } 465 466 467 /* allocate and initialize host bridge data structure */ 468 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus) 469 { 470 struct acpiphp_bridge *bridge; 471 472 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 473 if (bridge == NULL) 474 return; 475 476 bridge->type = BRIDGE_TYPE_HOST; 477 bridge->handle = handle; 478 479 bridge->pci_bus = pci_bus; 480 481 spin_lock_init(&bridge->res_lock); 482 483 init_bridge_misc(bridge); 484 } 485 486 487 /* allocate and initialize PCI-to-PCI bridge data structure */ 488 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev) 489 { 490 struct acpiphp_bridge *bridge; 491 492 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 493 if (bridge == NULL) { 494 err("out of memory\n"); 495 return; 496 } 497 498 bridge->type = BRIDGE_TYPE_P2P; 499 bridge->handle = handle; 500 config_p2p_bridge_flags(bridge); 501 502 bridge->pci_dev = pci_dev_get(pci_dev); 503 bridge->pci_bus = pci_dev->subordinate; 504 if (!bridge->pci_bus) { 505 err("This is not a PCI-to-PCI bridge!\n"); 506 goto err; 507 } 508 509 spin_lock_init(&bridge->res_lock); 510 511 init_bridge_misc(bridge); 512 return; 513 err: 514 pci_dev_put(pci_dev); 515 kfree(bridge); 516 return; 517 } 518 519 520 /* callback routine to find P2P bridges */ 521 static acpi_status 522 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 523 { 524 acpi_status status; 525 acpi_handle dummy_handle; 526 unsigned long tmp; 527 int device, function; 528 struct pci_dev *dev; 529 struct pci_bus *pci_bus = context; 530 531 status = acpi_get_handle(handle, "_ADR", &dummy_handle); 532 if (ACPI_FAILURE(status)) 533 return AE_OK; /* continue */ 534 535 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); 536 if (ACPI_FAILURE(status)) { 537 dbg("%s: _ADR evaluation failure\n", __FUNCTION__); 538 return AE_OK; 539 } 540 541 device = (tmp >> 16) & 0xffff; 542 function = tmp & 0xffff; 543 544 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); 545 546 if (!dev || !dev->subordinate) 547 goto out; 548 549 /* check if this bridge has ejectable slots */ 550 if ((detect_ejectable_slots(handle) > 0)) { 551 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 552 add_p2p_bridge(handle, dev); 553 } 554 555 /* search P2P bridges under this p2p bridge */ 556 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 557 find_p2p_bridge, dev->subordinate, NULL); 558 if (ACPI_FAILURE(status)) 559 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 560 561 out: 562 pci_dev_put(dev); 563 return AE_OK; 564 } 565 566 567 /* find hot-pluggable slots, and then find P2P bridge */ 568 static int add_bridge(acpi_handle handle) 569 { 570 acpi_status status; 571 unsigned long tmp; 572 int seg, bus; 573 acpi_handle dummy_handle; 574 struct pci_bus *pci_bus; 575 576 /* if the bridge doesn't have _STA, we assume it is always there */ 577 status = acpi_get_handle(handle, "_STA", &dummy_handle); 578 if (ACPI_SUCCESS(status)) { 579 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 580 if (ACPI_FAILURE(status)) { 581 dbg("%s: _STA evaluation failure\n", __FUNCTION__); 582 return 0; 583 } 584 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 585 /* don't register this object */ 586 return 0; 587 } 588 589 /* get PCI segment number */ 590 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); 591 592 seg = ACPI_SUCCESS(status) ? tmp : 0; 593 594 /* get PCI bus number */ 595 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); 596 597 if (ACPI_SUCCESS(status)) { 598 bus = tmp; 599 } else { 600 warn("can't get bus number, assuming 0\n"); 601 bus = 0; 602 } 603 604 pci_bus = pci_find_bus(seg, bus); 605 if (!pci_bus) { 606 err("Can't find bus %04x:%02x\n", seg, bus); 607 return 0; 608 } 609 610 /* check if this bridge has ejectable slots */ 611 if (detect_ejectable_slots(handle) > 0) { 612 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 613 add_host_bridge(handle, pci_bus); 614 } 615 616 /* search P2P bridges under this host bridge */ 617 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 618 find_p2p_bridge, pci_bus, NULL); 619 620 if (ACPI_FAILURE(status)) 621 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 622 623 return 0; 624 } 625 626 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 627 { 628 struct list_head *head; 629 list_for_each(head, &bridge_list) { 630 struct acpiphp_bridge *bridge = list_entry(head, 631 struct acpiphp_bridge, list); 632 if (bridge->handle == handle) 633 return bridge; 634 } 635 636 return NULL; 637 } 638 639 static void cleanup_bridge(struct acpiphp_bridge *bridge) 640 { 641 struct list_head *list, *tmp; 642 struct acpiphp_slot *slot; 643 acpi_status status; 644 acpi_handle handle = bridge->handle; 645 646 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 647 handle_hotplug_event_bridge); 648 if (ACPI_FAILURE(status)) 649 err("failed to remove notify handler\n"); 650 651 if ((bridge->type != BRIDGE_TYPE_HOST) && 652 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 653 status = acpi_install_notify_handler(bridge->func->handle, 654 ACPI_SYSTEM_NOTIFY, 655 handle_hotplug_event_func, 656 bridge->func); 657 if (ACPI_FAILURE(status)) 658 err("failed to install interrupt notify handler\n"); 659 } 660 661 slot = bridge->slots; 662 while (slot) { 663 struct acpiphp_slot *next = slot->next; 664 list_for_each_safe (list, tmp, &slot->funcs) { 665 struct acpiphp_func *func; 666 func = list_entry(list, struct acpiphp_func, sibling); 667 if (is_dock_device(func->handle)) { 668 unregister_hotplug_dock_device(func->handle); 669 unregister_dock_notifier(&func->nb); 670 } 671 if (!(func->flags & FUNC_HAS_DCK)) { 672 status = acpi_remove_notify_handler(func->handle, 673 ACPI_SYSTEM_NOTIFY, 674 handle_hotplug_event_func); 675 if (ACPI_FAILURE(status)) 676 err("failed to remove notify handler\n"); 677 } 678 pci_dev_put(func->pci_dev); 679 list_del(list); 680 kfree(func); 681 } 682 acpiphp_unregister_hotplug_slot(slot); 683 list_del(&slot->funcs); 684 kfree(slot); 685 slot = next; 686 } 687 688 pci_dev_put(bridge->pci_dev); 689 list_del(&bridge->list); 690 kfree(bridge); 691 } 692 693 static acpi_status 694 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 695 { 696 struct acpiphp_bridge *bridge; 697 698 /* cleanup p2p bridges under this P2P bridge 699 in a depth-first manner */ 700 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 701 cleanup_p2p_bridge, NULL, NULL); 702 703 if (!(bridge = acpiphp_handle_to_bridge(handle))) 704 return AE_OK; 705 cleanup_bridge(bridge); 706 return AE_OK; 707 } 708 709 static void remove_bridge(acpi_handle handle) 710 { 711 struct acpiphp_bridge *bridge; 712 713 /* cleanup p2p bridges under this host bridge 714 in a depth-first manner */ 715 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 716 (u32)1, cleanup_p2p_bridge, NULL, NULL); 717 718 bridge = acpiphp_handle_to_bridge(handle); 719 if (bridge) 720 cleanup_bridge(bridge); 721 } 722 723 static struct pci_dev * get_apic_pci_info(acpi_handle handle) 724 { 725 struct acpi_pci_id id; 726 struct pci_bus *bus; 727 struct pci_dev *dev; 728 729 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) 730 return NULL; 731 732 bus = pci_find_bus(id.segment, id.bus); 733 if (!bus) 734 return NULL; 735 736 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); 737 if (!dev) 738 return NULL; 739 740 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && 741 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) 742 { 743 pci_dev_put(dev); 744 return NULL; 745 } 746 747 return dev; 748 } 749 750 static int get_gsi_base(acpi_handle handle, u32 *gsi_base) 751 { 752 acpi_status status; 753 int result = -1; 754 unsigned long gsb; 755 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 756 union acpi_object *obj; 757 void *table; 758 759 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); 760 if (ACPI_SUCCESS(status)) { 761 *gsi_base = (u32)gsb; 762 return 0; 763 } 764 765 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); 766 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) 767 return -1; 768 769 obj = buffer.pointer; 770 if (obj->type != ACPI_TYPE_BUFFER) 771 goto out; 772 773 table = obj->buffer.pointer; 774 switch (((struct acpi_subtable_header *)table)->type) { 775 case ACPI_MADT_TYPE_IO_SAPIC: 776 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base; 777 result = 0; 778 break; 779 case ACPI_MADT_TYPE_IO_APIC: 780 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base; 781 result = 0; 782 break; 783 default: 784 break; 785 } 786 out: 787 kfree(buffer.pointer); 788 return result; 789 } 790 791 static acpi_status 792 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) 793 { 794 acpi_status status; 795 unsigned long sta; 796 acpi_handle tmp; 797 struct pci_dev *pdev; 798 u32 gsi_base; 799 u64 phys_addr; 800 struct acpiphp_ioapic *ioapic; 801 802 /* Evaluate _STA if present */ 803 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 804 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 805 return AE_CTRL_DEPTH; 806 807 /* Scan only PCI bus scope */ 808 status = acpi_get_handle(handle, "_HID", &tmp); 809 if (ACPI_SUCCESS(status)) 810 return AE_CTRL_DEPTH; 811 812 if (get_gsi_base(handle, &gsi_base)) 813 return AE_OK; 814 815 ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL); 816 if (!ioapic) 817 return AE_NO_MEMORY; 818 819 pdev = get_apic_pci_info(handle); 820 if (!pdev) 821 goto exit_kfree; 822 823 if (pci_enable_device(pdev)) 824 goto exit_pci_dev_put; 825 826 pci_set_master(pdev); 827 828 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) 829 goto exit_pci_disable_device; 830 831 phys_addr = pci_resource_start(pdev, 0); 832 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) 833 goto exit_pci_release_region; 834 835 ioapic->gsi_base = gsi_base; 836 ioapic->dev = pdev; 837 spin_lock(&ioapic_list_lock); 838 list_add_tail(&ioapic->list, &ioapic_list); 839 spin_unlock(&ioapic_list_lock); 840 841 return AE_OK; 842 843 exit_pci_release_region: 844 pci_release_region(pdev, 0); 845 exit_pci_disable_device: 846 pci_disable_device(pdev); 847 exit_pci_dev_put: 848 pci_dev_put(pdev); 849 exit_kfree: 850 kfree(ioapic); 851 852 return AE_OK; 853 } 854 855 static acpi_status 856 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv) 857 { 858 acpi_status status; 859 unsigned long sta; 860 acpi_handle tmp; 861 u32 gsi_base; 862 struct acpiphp_ioapic *pos, *n, *ioapic = NULL; 863 864 /* Evaluate _STA if present */ 865 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 866 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 867 return AE_CTRL_DEPTH; 868 869 /* Scan only PCI bus scope */ 870 status = acpi_get_handle(handle, "_HID", &tmp); 871 if (ACPI_SUCCESS(status)) 872 return AE_CTRL_DEPTH; 873 874 if (get_gsi_base(handle, &gsi_base)) 875 return AE_OK; 876 877 acpi_unregister_ioapic(handle, gsi_base); 878 879 spin_lock(&ioapic_list_lock); 880 list_for_each_entry_safe(pos, n, &ioapic_list, list) { 881 if (pos->gsi_base != gsi_base) 882 continue; 883 ioapic = pos; 884 list_del(&ioapic->list); 885 break; 886 } 887 spin_unlock(&ioapic_list_lock); 888 889 if (!ioapic) 890 return AE_OK; 891 892 pci_release_region(ioapic->dev, 0); 893 pci_disable_device(ioapic->dev); 894 pci_dev_put(ioapic->dev); 895 kfree(ioapic); 896 897 return AE_OK; 898 } 899 900 static int acpiphp_configure_ioapics(acpi_handle handle) 901 { 902 ioapic_add(handle, 0, NULL, NULL); 903 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 904 ACPI_UINT32_MAX, ioapic_add, NULL, NULL); 905 return 0; 906 } 907 908 static int acpiphp_unconfigure_ioapics(acpi_handle handle) 909 { 910 ioapic_remove(handle, 0, NULL, NULL); 911 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 912 ACPI_UINT32_MAX, ioapic_remove, NULL, NULL); 913 return 0; 914 } 915 916 static int power_on_slot(struct acpiphp_slot *slot) 917 { 918 acpi_status status; 919 struct acpiphp_func *func; 920 struct list_head *l; 921 int retval = 0; 922 923 /* if already enabled, just skip */ 924 if (slot->flags & SLOT_POWEREDON) 925 goto err_exit; 926 927 list_for_each (l, &slot->funcs) { 928 func = list_entry(l, struct acpiphp_func, sibling); 929 930 if (func->flags & FUNC_HAS_PS0) { 931 dbg("%s: executing _PS0\n", __FUNCTION__); 932 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 933 if (ACPI_FAILURE(status)) { 934 warn("%s: _PS0 failed\n", __FUNCTION__); 935 retval = -1; 936 goto err_exit; 937 } else 938 break; 939 } 940 } 941 942 /* TBD: evaluate _STA to check if the slot is enabled */ 943 944 slot->flags |= SLOT_POWEREDON; 945 946 err_exit: 947 return retval; 948 } 949 950 951 static int power_off_slot(struct acpiphp_slot *slot) 952 { 953 acpi_status status; 954 struct acpiphp_func *func; 955 struct list_head *l; 956 957 int retval = 0; 958 959 /* if already disabled, just skip */ 960 if ((slot->flags & SLOT_POWEREDON) == 0) 961 goto err_exit; 962 963 list_for_each (l, &slot->funcs) { 964 func = list_entry(l, struct acpiphp_func, sibling); 965 966 if (func->flags & FUNC_HAS_PS3) { 967 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 968 if (ACPI_FAILURE(status)) { 969 warn("%s: _PS3 failed\n", __FUNCTION__); 970 retval = -1; 971 goto err_exit; 972 } else 973 break; 974 } 975 } 976 977 /* TBD: evaluate _STA to check if the slot is disabled */ 978 979 slot->flags &= (~SLOT_POWEREDON); 980 981 err_exit: 982 return retval; 983 } 984 985 986 987 /** 988 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 989 * @bus: bus to start search with 990 */ 991 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 992 { 993 struct list_head *tmp; 994 unsigned char max, n; 995 996 /* 997 * pci_bus_max_busnr will return the highest 998 * reserved busnr for all these children. 999 * that is equivalent to the bus->subordinate 1000 * value. We don't want to use the parent's 1001 * bus->subordinate value because it could have 1002 * padding in it. 1003 */ 1004 max = bus->secondary; 1005 1006 list_for_each(tmp, &bus->children) { 1007 n = pci_bus_max_busnr(pci_bus_b(tmp)); 1008 if (n > max) 1009 max = n; 1010 } 1011 return max; 1012 } 1013 1014 1015 /** 1016 * acpiphp_bus_add - add a new bus to acpi subsystem 1017 * @func: acpiphp_func of the bridge 1018 */ 1019 static int acpiphp_bus_add(struct acpiphp_func *func) 1020 { 1021 acpi_handle phandle; 1022 struct acpi_device *device, *pdevice; 1023 int ret_val; 1024 1025 acpi_get_parent(func->handle, &phandle); 1026 if (acpi_bus_get_device(phandle, &pdevice)) { 1027 dbg("no parent device, assuming NULL\n"); 1028 pdevice = NULL; 1029 } 1030 if (!acpi_bus_get_device(func->handle, &device)) { 1031 dbg("bus exists... trim\n"); 1032 /* this shouldn't be in here, so remove 1033 * the bus then re-add it... 1034 */ 1035 ret_val = acpi_bus_trim(device, 1); 1036 dbg("acpi_bus_trim return %x\n", ret_val); 1037 } 1038 1039 ret_val = acpi_bus_add(&device, pdevice, func->handle, 1040 ACPI_BUS_TYPE_DEVICE); 1041 if (ret_val) { 1042 dbg("error adding bus, %x\n", 1043 -ret_val); 1044 goto acpiphp_bus_add_out; 1045 } 1046 /* 1047 * try to start anyway. We could have failed to add 1048 * simply because this bus had previously been added 1049 * on another add. Don't bother with the return value 1050 * we just keep going. 1051 */ 1052 ret_val = acpi_bus_start(device); 1053 1054 acpiphp_bus_add_out: 1055 return ret_val; 1056 } 1057 1058 1059 /** 1060 * acpiphp_bus_trim - trim a bus from acpi subsystem 1061 * @handle: handle to acpi namespace 1062 */ 1063 static int acpiphp_bus_trim(acpi_handle handle) 1064 { 1065 struct acpi_device *device; 1066 int retval; 1067 1068 retval = acpi_bus_get_device(handle, &device); 1069 if (retval) { 1070 dbg("acpi_device not found\n"); 1071 return retval; 1072 } 1073 1074 retval = acpi_bus_trim(device, 1); 1075 if (retval) 1076 err("cannot remove from acpi list\n"); 1077 1078 return retval; 1079 } 1080 1081 /** 1082 * enable_device - enable, configure a slot 1083 * @slot: slot to be enabled 1084 * 1085 * This function should be called per *physical slot*, 1086 * not per each slot object in ACPI namespace. 1087 */ 1088 static int enable_device(struct acpiphp_slot *slot) 1089 { 1090 struct pci_dev *dev; 1091 struct pci_bus *bus = slot->bridge->pci_bus; 1092 struct list_head *l; 1093 struct acpiphp_func *func; 1094 int retval = 0; 1095 int num, max, pass; 1096 acpi_status status; 1097 1098 if (slot->flags & SLOT_ENABLED) 1099 goto err_exit; 1100 1101 /* sanity check: dev should be NULL when hot-plugged in */ 1102 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 1103 if (dev) { 1104 /* This case shouldn't happen */ 1105 err("pci_dev structure already exists.\n"); 1106 pci_dev_put(dev); 1107 retval = -1; 1108 goto err_exit; 1109 } 1110 1111 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 1112 if (num == 0) { 1113 err("No new device found\n"); 1114 retval = -1; 1115 goto err_exit; 1116 } 1117 1118 max = acpiphp_max_busnr(bus); 1119 for (pass = 0; pass < 2; pass++) { 1120 list_for_each_entry(dev, &bus->devices, bus_list) { 1121 if (PCI_SLOT(dev->devfn) != slot->device) 1122 continue; 1123 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 1124 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 1125 max = pci_scan_bridge(bus, dev, max, pass); 1126 if (pass && dev->subordinate) 1127 pci_bus_size_bridges(dev->subordinate); 1128 } 1129 } 1130 } 1131 1132 list_for_each (l, &slot->funcs) { 1133 func = list_entry(l, struct acpiphp_func, sibling); 1134 acpiphp_bus_add(func); 1135 } 1136 1137 pci_bus_assign_resources(bus); 1138 acpiphp_sanitize_bus(bus); 1139 acpiphp_set_hpp_values(slot->bridge->handle, bus); 1140 list_for_each_entry(func, &slot->funcs, sibling) 1141 acpiphp_configure_ioapics(func->handle); 1142 pci_enable_bridges(bus); 1143 pci_bus_add_devices(bus); 1144 1145 /* associate pci_dev to our representation */ 1146 list_for_each (l, &slot->funcs) { 1147 func = list_entry(l, struct acpiphp_func, sibling); 1148 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 1149 func->function)); 1150 if (!func->pci_dev) 1151 continue; 1152 1153 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 1154 func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) 1155 continue; 1156 1157 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 1158 if (ACPI_FAILURE(status)) 1159 warn("find_p2p_bridge failed (error code = 0x%x)\n", 1160 status); 1161 } 1162 1163 slot->flags |= SLOT_ENABLED; 1164 1165 err_exit: 1166 return retval; 1167 } 1168 1169 static void disable_bridges(struct pci_bus *bus) 1170 { 1171 struct pci_dev *dev; 1172 list_for_each_entry(dev, &bus->devices, bus_list) { 1173 if (dev->subordinate) { 1174 disable_bridges(dev->subordinate); 1175 pci_disable_device(dev); 1176 } 1177 } 1178 } 1179 1180 /** 1181 * disable_device - disable a slot 1182 * @slot: ACPI PHP slot 1183 */ 1184 static int disable_device(struct acpiphp_slot *slot) 1185 { 1186 int retval = 0; 1187 struct acpiphp_func *func; 1188 struct list_head *l; 1189 1190 /* is this slot already disabled? */ 1191 if (!(slot->flags & SLOT_ENABLED)) 1192 goto err_exit; 1193 1194 list_for_each (l, &slot->funcs) { 1195 func = list_entry(l, struct acpiphp_func, sibling); 1196 1197 if (func->bridge) { 1198 /* cleanup p2p bridges under this P2P bridge */ 1199 cleanup_p2p_bridge(func->bridge->handle, 1200 (u32)1, NULL, NULL); 1201 func->bridge = NULL; 1202 } 1203 1204 if (func->pci_dev) { 1205 pci_stop_bus_device(func->pci_dev); 1206 if (func->pci_dev->subordinate) { 1207 disable_bridges(func->pci_dev->subordinate); 1208 pci_disable_device(func->pci_dev); 1209 } 1210 } 1211 } 1212 1213 list_for_each (l, &slot->funcs) { 1214 func = list_entry(l, struct acpiphp_func, sibling); 1215 1216 acpiphp_unconfigure_ioapics(func->handle); 1217 acpiphp_bus_trim(func->handle); 1218 /* try to remove anyway. 1219 * acpiphp_bus_add might have been failed */ 1220 1221 if (!func->pci_dev) 1222 continue; 1223 1224 pci_remove_bus_device(func->pci_dev); 1225 pci_dev_put(func->pci_dev); 1226 func->pci_dev = NULL; 1227 } 1228 1229 slot->flags &= (~SLOT_ENABLED); 1230 1231 err_exit: 1232 return retval; 1233 } 1234 1235 1236 /** 1237 * get_slot_status - get ACPI slot status 1238 * @slot: ACPI PHP slot 1239 * 1240 * If a slot has _STA for each function and if any one of them 1241 * returned non-zero status, return it. 1242 * 1243 * If a slot doesn't have _STA and if any one of its functions' 1244 * configuration space is configured, return 0x0f as a _STA. 1245 * 1246 * Otherwise return 0. 1247 */ 1248 static unsigned int get_slot_status(struct acpiphp_slot *slot) 1249 { 1250 acpi_status status; 1251 unsigned long sta = 0; 1252 u32 dvid; 1253 struct list_head *l; 1254 struct acpiphp_func *func; 1255 1256 list_for_each (l, &slot->funcs) { 1257 func = list_entry(l, struct acpiphp_func, sibling); 1258 1259 if (func->flags & FUNC_HAS_STA) { 1260 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 1261 if (ACPI_SUCCESS(status) && sta) 1262 break; 1263 } else { 1264 pci_bus_read_config_dword(slot->bridge->pci_bus, 1265 PCI_DEVFN(slot->device, 1266 func->function), 1267 PCI_VENDOR_ID, &dvid); 1268 if (dvid != 0xffffffff) { 1269 sta = ACPI_STA_ALL; 1270 break; 1271 } 1272 } 1273 } 1274 1275 return (unsigned int)sta; 1276 } 1277 1278 /** 1279 * acpiphp_eject_slot - physically eject the slot 1280 * @slot: ACPI PHP slot 1281 */ 1282 int acpiphp_eject_slot(struct acpiphp_slot *slot) 1283 { 1284 acpi_status status; 1285 struct acpiphp_func *func; 1286 struct list_head *l; 1287 struct acpi_object_list arg_list; 1288 union acpi_object arg; 1289 1290 list_for_each (l, &slot->funcs) { 1291 func = list_entry(l, struct acpiphp_func, sibling); 1292 1293 /* We don't want to call _EJ0 on non-existing functions. */ 1294 if ((func->flags & FUNC_HAS_EJ0)) { 1295 /* _EJ0 method take one argument */ 1296 arg_list.count = 1; 1297 arg_list.pointer = &arg; 1298 arg.type = ACPI_TYPE_INTEGER; 1299 arg.integer.value = 1; 1300 1301 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1302 if (ACPI_FAILURE(status)) { 1303 warn("%s: _EJ0 failed\n", __FUNCTION__); 1304 return -1; 1305 } else 1306 break; 1307 } 1308 } 1309 return 0; 1310 } 1311 1312 /** 1313 * acpiphp_check_bridge - re-enumerate devices 1314 * @bridge: where to begin re-enumeration 1315 * 1316 * Iterate over all slots under this bridge and make sure that if a 1317 * card is present they are enabled, and if not they are disabled. 1318 */ 1319 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1320 { 1321 struct acpiphp_slot *slot; 1322 int retval = 0; 1323 int enabled, disabled; 1324 1325 enabled = disabled = 0; 1326 1327 for (slot = bridge->slots; slot; slot = slot->next) { 1328 unsigned int status = get_slot_status(slot); 1329 if (slot->flags & SLOT_ENABLED) { 1330 if (status == ACPI_STA_ALL) 1331 continue; 1332 retval = acpiphp_disable_slot(slot); 1333 if (retval) { 1334 err("Error occurred in disabling\n"); 1335 goto err_exit; 1336 } else { 1337 acpiphp_eject_slot(slot); 1338 } 1339 disabled++; 1340 } else { 1341 if (status != ACPI_STA_ALL) 1342 continue; 1343 retval = acpiphp_enable_slot(slot); 1344 if (retval) { 1345 err("Error occurred in enabling\n"); 1346 goto err_exit; 1347 } 1348 enabled++; 1349 } 1350 } 1351 1352 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); 1353 1354 err_exit: 1355 return retval; 1356 } 1357 1358 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) 1359 { 1360 u16 pci_cmd, pci_bctl; 1361 struct pci_dev *cdev; 1362 1363 /* Program hpp values for this device */ 1364 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 1365 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 1366 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 1367 return; 1368 1369 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) 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 static acpi_status 1507 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1508 { 1509 int *count = (int *)context; 1510 struct acpiphp_bridge *bridge; 1511 1512 bridge = acpiphp_handle_to_bridge(handle); 1513 if (bridge) 1514 (*count)++; 1515 return AE_OK ; 1516 } 1517 1518 static acpi_status 1519 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1520 { 1521 struct acpiphp_bridge *bridge; 1522 char objname[64]; 1523 struct acpi_buffer buffer = { .length = sizeof(objname), 1524 .pointer = objname }; 1525 1526 bridge = acpiphp_handle_to_bridge(handle); 1527 if (bridge) { 1528 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1529 dbg("%s: re-enumerating slots under %s\n", 1530 __FUNCTION__, objname); 1531 acpiphp_check_bridge(bridge); 1532 } 1533 return AE_OK ; 1534 } 1535 1536 /** 1537 * handle_hotplug_event_bridge - handle ACPI event on bridges 1538 * @handle: Notify()'ed acpi_handle 1539 * @type: Notify code 1540 * @context: pointer to acpiphp_bridge structure 1541 * 1542 * Handles ACPI event notification on {host,p2p} bridges. 1543 */ 1544 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) 1545 { 1546 struct acpiphp_bridge *bridge; 1547 char objname[64]; 1548 struct acpi_buffer buffer = { .length = sizeof(objname), 1549 .pointer = objname }; 1550 struct acpi_device *device; 1551 int num_sub_bridges = 0; 1552 1553 if (acpi_bus_get_device(handle, &device)) { 1554 /* This bridge must have just been physically inserted */ 1555 handle_bridge_insertion(handle, type); 1556 return; 1557 } 1558 1559 bridge = acpiphp_handle_to_bridge(handle); 1560 if (type == ACPI_NOTIFY_BUS_CHECK) { 1561 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1562 count_sub_bridges, &num_sub_bridges, NULL); 1563 } 1564 1565 if (!bridge && !num_sub_bridges) { 1566 err("cannot get bridge info\n"); 1567 return; 1568 } 1569 1570 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1571 1572 switch (type) { 1573 case ACPI_NOTIFY_BUS_CHECK: 1574 /* bus re-enumerate */ 1575 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1576 if (bridge) { 1577 dbg("%s: re-enumerating slots under %s\n", 1578 __FUNCTION__, objname); 1579 acpiphp_check_bridge(bridge); 1580 } 1581 if (num_sub_bridges) 1582 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1583 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL); 1584 break; 1585 1586 case ACPI_NOTIFY_DEVICE_CHECK: 1587 /* device check */ 1588 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1589 acpiphp_check_bridge(bridge); 1590 break; 1591 1592 case ACPI_NOTIFY_DEVICE_WAKE: 1593 /* wake event */ 1594 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1595 break; 1596 1597 case ACPI_NOTIFY_EJECT_REQUEST: 1598 /* request device eject */ 1599 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1600 if ((bridge->type != BRIDGE_TYPE_HOST) && 1601 (bridge->flags & BRIDGE_HAS_EJ0)) { 1602 struct acpiphp_slot *slot; 1603 slot = bridge->func->slot; 1604 if (!acpiphp_disable_slot(slot)) 1605 acpiphp_eject_slot(slot); 1606 } 1607 break; 1608 1609 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1610 printk(KERN_ERR "Device %s cannot be configured due" 1611 " to a frequency mismatch\n", objname); 1612 break; 1613 1614 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1615 printk(KERN_ERR "Device %s cannot be configured due" 1616 " to a bus mode mismatch\n", objname); 1617 break; 1618 1619 case ACPI_NOTIFY_POWER_FAULT: 1620 printk(KERN_ERR "Device %s has suffered a power fault\n", 1621 objname); 1622 break; 1623 1624 default: 1625 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1626 break; 1627 } 1628 } 1629 1630 /** 1631 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1632 * @handle: Notify()'ed acpi_handle 1633 * @type: Notify code 1634 * @context: pointer to acpiphp_func structure 1635 * 1636 * Handles ACPI event notification on slots. 1637 */ 1638 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) 1639 { 1640 struct acpiphp_func *func; 1641 char objname[64]; 1642 struct acpi_buffer buffer = { .length = sizeof(objname), 1643 .pointer = objname }; 1644 1645 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1646 1647 func = (struct acpiphp_func *)context; 1648 1649 switch (type) { 1650 case ACPI_NOTIFY_BUS_CHECK: 1651 /* bus re-enumerate */ 1652 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1653 acpiphp_enable_slot(func->slot); 1654 break; 1655 1656 case ACPI_NOTIFY_DEVICE_CHECK: 1657 /* device check : re-enumerate from parent bus */ 1658 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1659 acpiphp_check_bridge(func->slot->bridge); 1660 break; 1661 1662 case ACPI_NOTIFY_DEVICE_WAKE: 1663 /* wake event */ 1664 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1665 break; 1666 1667 case ACPI_NOTIFY_EJECT_REQUEST: 1668 /* request device eject */ 1669 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1670 if (!(acpiphp_disable_slot(func->slot))) 1671 acpiphp_eject_slot(func->slot); 1672 break; 1673 1674 default: 1675 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1676 break; 1677 } 1678 } 1679 1680 1681 static acpi_status 1682 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1683 { 1684 int *count = (int *)context; 1685 1686 if (acpi_root_bridge(handle)) { 1687 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1688 handle_hotplug_event_bridge, NULL); 1689 (*count)++; 1690 } 1691 return AE_OK ; 1692 } 1693 1694 static struct acpi_pci_driver acpi_pci_hp_driver = { 1695 .add = add_bridge, 1696 .remove = remove_bridge, 1697 }; 1698 1699 /** 1700 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1701 */ 1702 int __init acpiphp_glue_init(void) 1703 { 1704 int num = 0; 1705 1706 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1707 ACPI_UINT32_MAX, find_root_bridges, &num, NULL); 1708 1709 if (num <= 0) 1710 return -1; 1711 else 1712 acpi_pci_register_driver(&acpi_pci_hp_driver); 1713 1714 return 0; 1715 } 1716 1717 1718 /** 1719 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1720 * 1721 * This function frees all data allocated in acpiphp_glue_init(). 1722 */ 1723 void acpiphp_glue_exit(void) 1724 { 1725 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1726 } 1727 1728 1729 /** 1730 * acpiphp_get_num_slots - count number of slots in a system 1731 */ 1732 int __init acpiphp_get_num_slots(void) 1733 { 1734 struct acpiphp_bridge *bridge; 1735 int num_slots = 0; 1736 1737 list_for_each_entry (bridge, &bridge_list, list) { 1738 dbg("Bus %04x:%02x has %d slot%s\n", 1739 pci_domain_nr(bridge->pci_bus), 1740 bridge->pci_bus->number, bridge->nr_slots, 1741 bridge->nr_slots == 1 ? "" : "s"); 1742 num_slots += bridge->nr_slots; 1743 } 1744 1745 dbg("Total %d slots\n", num_slots); 1746 return num_slots; 1747 } 1748 1749 1750 #if 0 1751 /** 1752 * acpiphp_for_each_slot - call function for each slot 1753 * @fn: callback function 1754 * @data: context to be passed to callback function 1755 */ 1756 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1757 { 1758 struct list_head *node; 1759 struct acpiphp_bridge *bridge; 1760 struct acpiphp_slot *slot; 1761 int retval = 0; 1762 1763 list_for_each (node, &bridge_list) { 1764 bridge = (struct acpiphp_bridge *)node; 1765 for (slot = bridge->slots; slot; slot = slot->next) { 1766 retval = fn(slot, data); 1767 if (!retval) 1768 goto err_exit; 1769 } 1770 } 1771 1772 err_exit: 1773 return retval; 1774 } 1775 #endif 1776 1777 1778 /** 1779 * acpiphp_enable_slot - power on slot 1780 * @slot: ACPI PHP slot 1781 */ 1782 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1783 { 1784 int retval; 1785 1786 mutex_lock(&slot->crit_sect); 1787 1788 /* wake up all functions */ 1789 retval = power_on_slot(slot); 1790 if (retval) 1791 goto err_exit; 1792 1793 if (get_slot_status(slot) == ACPI_STA_ALL) { 1794 /* configure all functions */ 1795 retval = enable_device(slot); 1796 if (retval) 1797 power_off_slot(slot); 1798 } else { 1799 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__); 1800 power_off_slot(slot); 1801 } 1802 1803 err_exit: 1804 mutex_unlock(&slot->crit_sect); 1805 return retval; 1806 } 1807 1808 /** 1809 * acpiphp_disable_slot - power off slot 1810 * @slot: ACPI PHP slot 1811 */ 1812 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1813 { 1814 int retval = 0; 1815 1816 mutex_lock(&slot->crit_sect); 1817 1818 /* unconfigure all functions */ 1819 retval = disable_device(slot); 1820 if (retval) 1821 goto err_exit; 1822 1823 /* power off all functions */ 1824 retval = power_off_slot(slot); 1825 if (retval) 1826 goto err_exit; 1827 1828 err_exit: 1829 mutex_unlock(&slot->crit_sect); 1830 return retval; 1831 } 1832 1833 1834 /* 1835 * slot enabled: 1 1836 * slot disabled: 0 1837 */ 1838 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1839 { 1840 return (slot->flags & SLOT_POWEREDON); 1841 } 1842 1843 1844 /* 1845 * latch open: 1 1846 * latch closed: 0 1847 */ 1848 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1849 { 1850 unsigned int sta; 1851 1852 sta = get_slot_status(slot); 1853 1854 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1855 } 1856 1857 1858 /* 1859 * adapter presence : 1 1860 * absence : 0 1861 */ 1862 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1863 { 1864 unsigned int sta; 1865 1866 sta = get_slot_status(slot); 1867 1868 return (sta == 0) ? 0 : 1; 1869 } 1870 1871 1872 /* 1873 * pci address (seg/bus/dev) 1874 */ 1875 u32 acpiphp_get_address(struct acpiphp_slot *slot) 1876 { 1877 u32 address; 1878 struct pci_bus *pci_bus = slot->bridge->pci_bus; 1879 1880 address = (pci_domain_nr(pci_bus) << 16) | 1881 (pci_bus->number << 8) | 1882 slot->device; 1883 1884 return address; 1885 } 1886