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