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_bus, &bridge->hpp); 290 if (ACPI_FAILURE(status) || 291 !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) { 292 /* use default numbers */ 293 printk(KERN_WARNING 294 "%s: Could not get hotplug parameters. Use defaults\n", 295 __FUNCTION__); 296 bridge->hpp.t0 = &bridge->hpp.type0_data; 297 bridge->hpp.t0->revision = 0; 298 bridge->hpp.t0->cache_line_size = 0x10; 299 bridge->hpp.t0->latency_timer = 0x40; 300 bridge->hpp.t0->enable_serr = 0; 301 bridge->hpp.t0->enable_perr = 0; 302 } 303 } 304 305 306 307 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 308 static void init_bridge_misc(struct acpiphp_bridge *bridge) 309 { 310 acpi_status status; 311 312 /* decode ACPI 2.0 _HPP (hot plug parameters) */ 313 decode_hpp(bridge); 314 315 /* must be added to the list prior to calling register_slot */ 316 list_add(&bridge->list, &bridge_list); 317 318 /* register all slot objects under this bridge */ 319 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 320 register_slot, bridge, NULL); 321 if (ACPI_FAILURE(status)) { 322 list_del(&bridge->list); 323 return; 324 } 325 326 /* install notify handler */ 327 if (bridge->type != BRIDGE_TYPE_HOST) { 328 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 329 status = acpi_remove_notify_handler(bridge->func->handle, 330 ACPI_SYSTEM_NOTIFY, 331 handle_hotplug_event_func); 332 if (ACPI_FAILURE(status)) 333 err("failed to remove notify handler\n"); 334 } 335 status = acpi_install_notify_handler(bridge->handle, 336 ACPI_SYSTEM_NOTIFY, 337 handle_hotplug_event_bridge, 338 bridge); 339 340 if (ACPI_FAILURE(status)) { 341 err("failed to register interrupt notify handler\n"); 342 } 343 } 344 } 345 346 347 /* find acpiphp_func from acpiphp_bridge */ 348 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 349 { 350 struct list_head *node, *l; 351 struct acpiphp_bridge *bridge; 352 struct acpiphp_slot *slot; 353 struct acpiphp_func *func; 354 355 list_for_each(node, &bridge_list) { 356 bridge = list_entry(node, struct acpiphp_bridge, list); 357 for (slot = bridge->slots; slot; slot = slot->next) { 358 list_for_each(l, &slot->funcs) { 359 func = list_entry(l, struct acpiphp_func, 360 sibling); 361 if (func->handle == handle) 362 return func; 363 } 364 } 365 } 366 367 return NULL; 368 } 369 370 371 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) 372 { 373 acpi_handle dummy_handle; 374 375 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 376 "_STA", &dummy_handle))) 377 bridge->flags |= BRIDGE_HAS_STA; 378 379 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 380 "_EJ0", &dummy_handle))) 381 bridge->flags |= BRIDGE_HAS_EJ0; 382 383 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 384 "_PS0", &dummy_handle))) 385 bridge->flags |= BRIDGE_HAS_PS0; 386 387 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 388 "_PS3", &dummy_handle))) 389 bridge->flags |= BRIDGE_HAS_PS3; 390 391 /* is this ejectable p2p bridge? */ 392 if (bridge->flags & BRIDGE_HAS_EJ0) { 393 struct acpiphp_func *func; 394 395 dbg("found ejectable p2p bridge\n"); 396 397 /* make link between PCI bridge and PCI function */ 398 func = acpiphp_bridge_handle_to_function(bridge->handle); 399 if (!func) 400 return; 401 bridge->func = func; 402 func->bridge = bridge; 403 } 404 } 405 406 407 /* allocate and initialize host bridge data structure */ 408 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus) 409 { 410 struct acpiphp_bridge *bridge; 411 412 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 413 if (bridge == NULL) 414 return; 415 416 bridge->type = BRIDGE_TYPE_HOST; 417 bridge->handle = handle; 418 419 bridge->pci_bus = pci_bus; 420 421 spin_lock_init(&bridge->res_lock); 422 423 init_bridge_misc(bridge); 424 } 425 426 427 /* allocate and initialize PCI-to-PCI bridge data structure */ 428 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev) 429 { 430 struct acpiphp_bridge *bridge; 431 432 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 433 if (bridge == NULL) { 434 err("out of memory\n"); 435 return; 436 } 437 438 bridge->type = BRIDGE_TYPE_P2P; 439 bridge->handle = handle; 440 config_p2p_bridge_flags(bridge); 441 442 bridge->pci_dev = pci_dev_get(pci_dev); 443 bridge->pci_bus = pci_dev->subordinate; 444 if (!bridge->pci_bus) { 445 err("This is not a PCI-to-PCI bridge!\n"); 446 goto err; 447 } 448 449 spin_lock_init(&bridge->res_lock); 450 451 init_bridge_misc(bridge); 452 return; 453 err: 454 pci_dev_put(pci_dev); 455 kfree(bridge); 456 return; 457 } 458 459 460 /* callback routine to find P2P bridges */ 461 static acpi_status 462 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 463 { 464 acpi_status status; 465 acpi_handle dummy_handle; 466 unsigned long tmp; 467 int device, function; 468 struct pci_dev *dev; 469 struct pci_bus *pci_bus = context; 470 471 status = acpi_get_handle(handle, "_ADR", &dummy_handle); 472 if (ACPI_FAILURE(status)) 473 return AE_OK; /* continue */ 474 475 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); 476 if (ACPI_FAILURE(status)) { 477 dbg("%s: _ADR evaluation failure\n", __FUNCTION__); 478 return AE_OK; 479 } 480 481 device = (tmp >> 16) & 0xffff; 482 function = tmp & 0xffff; 483 484 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); 485 486 if (!dev || !dev->subordinate) 487 goto out; 488 489 /* check if this bridge has ejectable slots */ 490 if ((detect_ejectable_slots(handle) > 0) || 491 (detect_dependent_devices(handle) > 0)) { 492 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 493 add_p2p_bridge(handle, dev); 494 } 495 496 /* search P2P bridges under this p2p bridge */ 497 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 498 find_p2p_bridge, dev->subordinate, NULL); 499 if (ACPI_FAILURE(status)) 500 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 501 502 out: 503 pci_dev_put(dev); 504 return AE_OK; 505 } 506 507 508 /* find hot-pluggable slots, and then find P2P bridge */ 509 static int add_bridge(acpi_handle handle) 510 { 511 acpi_status status; 512 unsigned long tmp; 513 int seg, bus; 514 acpi_handle dummy_handle; 515 struct pci_bus *pci_bus; 516 517 /* if the bridge doesn't have _STA, we assume it is always there */ 518 status = acpi_get_handle(handle, "_STA", &dummy_handle); 519 if (ACPI_SUCCESS(status)) { 520 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 521 if (ACPI_FAILURE(status)) { 522 dbg("%s: _STA evaluation failure\n", __FUNCTION__); 523 return 0; 524 } 525 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 526 /* don't register this object */ 527 return 0; 528 } 529 530 /* get PCI segment number */ 531 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); 532 533 seg = ACPI_SUCCESS(status) ? tmp : 0; 534 535 /* get PCI bus number */ 536 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); 537 538 if (ACPI_SUCCESS(status)) { 539 bus = tmp; 540 } else { 541 warn("can't get bus number, assuming 0\n"); 542 bus = 0; 543 } 544 545 pci_bus = pci_find_bus(seg, bus); 546 if (!pci_bus) { 547 err("Can't find bus %04x:%02x\n", seg, bus); 548 return 0; 549 } 550 551 /* check if this bridge has ejectable slots */ 552 if (detect_ejectable_slots(handle) > 0) { 553 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 554 add_host_bridge(handle, pci_bus); 555 } 556 557 /* search P2P bridges under this host bridge */ 558 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 559 find_p2p_bridge, pci_bus, NULL); 560 561 if (ACPI_FAILURE(status)) 562 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 563 564 return 0; 565 } 566 567 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 568 { 569 struct list_head *head; 570 list_for_each(head, &bridge_list) { 571 struct acpiphp_bridge *bridge = list_entry(head, 572 struct acpiphp_bridge, list); 573 if (bridge->handle == handle) 574 return bridge; 575 } 576 577 return NULL; 578 } 579 580 static void cleanup_bridge(struct acpiphp_bridge *bridge) 581 { 582 struct list_head *list, *tmp; 583 struct acpiphp_slot *slot; 584 acpi_status status; 585 acpi_handle handle = bridge->handle; 586 587 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 588 handle_hotplug_event_bridge); 589 if (ACPI_FAILURE(status)) 590 err("failed to remove notify handler\n"); 591 592 if ((bridge->type != BRIDGE_TYPE_HOST) && 593 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 594 status = acpi_install_notify_handler(bridge->func->handle, 595 ACPI_SYSTEM_NOTIFY, 596 handle_hotplug_event_func, 597 bridge->func); 598 if (ACPI_FAILURE(status)) 599 err("failed to install interrupt notify handler\n"); 600 } 601 602 slot = bridge->slots; 603 while (slot) { 604 struct acpiphp_slot *next = slot->next; 605 list_for_each_safe (list, tmp, &slot->funcs) { 606 struct acpiphp_func *func; 607 func = list_entry(list, struct acpiphp_func, sibling); 608 if (!(func->flags & FUNC_HAS_DCK)) { 609 status = acpi_remove_notify_handler(func->handle, 610 ACPI_SYSTEM_NOTIFY, 611 handle_hotplug_event_func); 612 if (ACPI_FAILURE(status)) 613 err("failed to remove notify handler\n"); 614 } 615 pci_dev_put(func->pci_dev); 616 list_del(list); 617 kfree(func); 618 } 619 acpiphp_unregister_hotplug_slot(slot); 620 list_del(&slot->funcs); 621 kfree(slot); 622 slot = next; 623 } 624 625 pci_dev_put(bridge->pci_dev); 626 list_del(&bridge->list); 627 kfree(bridge); 628 } 629 630 static acpi_status 631 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 632 { 633 struct acpiphp_bridge *bridge; 634 635 /* cleanup p2p bridges under this P2P bridge 636 in a depth-first manner */ 637 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 638 cleanup_p2p_bridge, NULL, NULL); 639 640 if (!(bridge = acpiphp_handle_to_bridge(handle))) 641 return AE_OK; 642 cleanup_bridge(bridge); 643 return AE_OK; 644 } 645 646 static void remove_bridge(acpi_handle handle) 647 { 648 struct acpiphp_bridge *bridge; 649 650 /* cleanup p2p bridges under this host bridge 651 in a depth-first manner */ 652 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 653 (u32)1, cleanup_p2p_bridge, NULL, NULL); 654 655 bridge = acpiphp_handle_to_bridge(handle); 656 if (bridge) 657 cleanup_bridge(bridge); 658 } 659 660 static struct pci_dev * get_apic_pci_info(acpi_handle handle) 661 { 662 struct acpi_pci_id id; 663 struct pci_bus *bus; 664 struct pci_dev *dev; 665 666 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) 667 return NULL; 668 669 bus = pci_find_bus(id.segment, id.bus); 670 if (!bus) 671 return NULL; 672 673 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); 674 if (!dev) 675 return NULL; 676 677 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && 678 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) 679 { 680 pci_dev_put(dev); 681 return NULL; 682 } 683 684 return dev; 685 } 686 687 static int get_gsi_base(acpi_handle handle, u32 *gsi_base) 688 { 689 acpi_status status; 690 int result = -1; 691 unsigned long gsb; 692 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 693 union acpi_object *obj; 694 void *table; 695 696 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); 697 if (ACPI_SUCCESS(status)) { 698 *gsi_base = (u32)gsb; 699 return 0; 700 } 701 702 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); 703 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) 704 return -1; 705 706 obj = buffer.pointer; 707 if (obj->type != ACPI_TYPE_BUFFER) 708 goto out; 709 710 table = obj->buffer.pointer; 711 switch (((acpi_table_entry_header *)table)->type) { 712 case ACPI_MADT_IOSAPIC: 713 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base; 714 result = 0; 715 break; 716 case ACPI_MADT_IOAPIC: 717 *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base; 718 result = 0; 719 break; 720 default: 721 break; 722 } 723 out: 724 kfree(buffer.pointer); 725 return result; 726 } 727 728 static acpi_status 729 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) 730 { 731 acpi_status status; 732 unsigned long sta; 733 acpi_handle tmp; 734 struct pci_dev *pdev; 735 u32 gsi_base; 736 u64 phys_addr; 737 738 /* Evaluate _STA if present */ 739 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 740 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 741 return AE_CTRL_DEPTH; 742 743 /* Scan only PCI bus scope */ 744 status = acpi_get_handle(handle, "_HID", &tmp); 745 if (ACPI_SUCCESS(status)) 746 return AE_CTRL_DEPTH; 747 748 if (get_gsi_base(handle, &gsi_base)) 749 return AE_OK; 750 751 pdev = get_apic_pci_info(handle); 752 if (!pdev) 753 return AE_OK; 754 755 if (pci_enable_device(pdev)) { 756 pci_dev_put(pdev); 757 return AE_OK; 758 } 759 760 pci_set_master(pdev); 761 762 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) { 763 pci_disable_device(pdev); 764 pci_dev_put(pdev); 765 return AE_OK; 766 } 767 768 phys_addr = pci_resource_start(pdev, 0); 769 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) { 770 pci_release_region(pdev, 0); 771 pci_disable_device(pdev); 772 pci_dev_put(pdev); 773 return AE_OK; 774 } 775 776 return AE_OK; 777 } 778 779 static int acpiphp_configure_ioapics(acpi_handle handle) 780 { 781 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 782 ACPI_UINT32_MAX, ioapic_add, NULL, NULL); 783 return 0; 784 } 785 786 static int power_on_slot(struct acpiphp_slot *slot) 787 { 788 acpi_status status; 789 struct acpiphp_func *func; 790 struct list_head *l; 791 int retval = 0; 792 793 /* if already enabled, just skip */ 794 if (slot->flags & SLOT_POWEREDON) 795 goto err_exit; 796 797 list_for_each (l, &slot->funcs) { 798 func = list_entry(l, struct acpiphp_func, sibling); 799 800 if (func->flags & FUNC_HAS_PS0) { 801 dbg("%s: executing _PS0\n", __FUNCTION__); 802 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 803 if (ACPI_FAILURE(status)) { 804 warn("%s: _PS0 failed\n", __FUNCTION__); 805 retval = -1; 806 goto err_exit; 807 } else 808 break; 809 } 810 } 811 812 /* TBD: evaluate _STA to check if the slot is enabled */ 813 814 slot->flags |= SLOT_POWEREDON; 815 816 err_exit: 817 return retval; 818 } 819 820 821 static int power_off_slot(struct acpiphp_slot *slot) 822 { 823 acpi_status status; 824 struct acpiphp_func *func; 825 struct list_head *l; 826 827 int retval = 0; 828 829 /* if already disabled, just skip */ 830 if ((slot->flags & SLOT_POWEREDON) == 0) 831 goto err_exit; 832 833 list_for_each (l, &slot->funcs) { 834 func = list_entry(l, struct acpiphp_func, sibling); 835 836 if (func->flags & FUNC_HAS_PS3) { 837 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 838 if (ACPI_FAILURE(status)) { 839 warn("%s: _PS3 failed\n", __FUNCTION__); 840 retval = -1; 841 goto err_exit; 842 } else 843 break; 844 } 845 } 846 847 /* TBD: evaluate _STA to check if the slot is disabled */ 848 849 slot->flags &= (~SLOT_POWEREDON); 850 851 err_exit: 852 return retval; 853 } 854 855 856 857 /** 858 * acpiphp_max_busnr - return the highest reserved bus number under 859 * the given bus. 860 * @bus: bus to start search with 861 * 862 */ 863 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 864 { 865 struct list_head *tmp; 866 unsigned char max, n; 867 868 /* 869 * pci_bus_max_busnr will return the highest 870 * reserved busnr for all these children. 871 * that is equivalent to the bus->subordinate 872 * value. We don't want to use the parent's 873 * bus->subordinate value because it could have 874 * padding in it. 875 */ 876 max = bus->secondary; 877 878 list_for_each(tmp, &bus->children) { 879 n = pci_bus_max_busnr(pci_bus_b(tmp)); 880 if (n > max) 881 max = n; 882 } 883 return max; 884 } 885 886 887 /** 888 * acpiphp_bus_add - add a new bus to acpi subsystem 889 * @func: acpiphp_func of the bridge 890 * 891 */ 892 static int acpiphp_bus_add(struct acpiphp_func *func) 893 { 894 acpi_handle phandle; 895 struct acpi_device *device, *pdevice; 896 int ret_val; 897 898 acpi_get_parent(func->handle, &phandle); 899 if (acpi_bus_get_device(phandle, &pdevice)) { 900 dbg("no parent device, assuming NULL\n"); 901 pdevice = NULL; 902 } 903 if (!acpi_bus_get_device(func->handle, &device)) { 904 dbg("bus exists... trim\n"); 905 /* this shouldn't be in here, so remove 906 * the bus then re-add it... 907 */ 908 ret_val = acpi_bus_trim(device, 1); 909 dbg("acpi_bus_trim return %x\n", ret_val); 910 } 911 912 ret_val = acpi_bus_add(&device, pdevice, func->handle, 913 ACPI_BUS_TYPE_DEVICE); 914 if (ret_val) { 915 dbg("error adding bus, %x\n", 916 -ret_val); 917 goto acpiphp_bus_add_out; 918 } 919 /* 920 * try to start anyway. We could have failed to add 921 * simply because this bus had previously been added 922 * on another add. Don't bother with the return value 923 * we just keep going. 924 */ 925 ret_val = acpi_bus_start(device); 926 927 acpiphp_bus_add_out: 928 return ret_val; 929 } 930 931 932 /** 933 * acpiphp_bus_trim - trim a bus from acpi subsystem 934 * @handle: handle to acpi namespace 935 * 936 */ 937 int acpiphp_bus_trim(acpi_handle handle) 938 { 939 struct acpi_device *device; 940 int retval; 941 942 retval = acpi_bus_get_device(handle, &device); 943 if (retval) { 944 dbg("acpi_device not found\n"); 945 return retval; 946 } 947 948 retval = acpi_bus_trim(device, 1); 949 if (retval) 950 err("cannot remove from acpi list\n"); 951 952 return retval; 953 } 954 955 /** 956 * enable_device - enable, configure a slot 957 * @slot: slot to be enabled 958 * 959 * This function should be called per *physical slot*, 960 * not per each slot object in ACPI namespace. 961 * 962 */ 963 static int enable_device(struct acpiphp_slot *slot) 964 { 965 struct pci_dev *dev; 966 struct pci_bus *bus = slot->bridge->pci_bus; 967 struct list_head *l; 968 struct acpiphp_func *func; 969 int retval = 0; 970 int num, max, pass; 971 acpi_status status; 972 973 if (slot->flags & SLOT_ENABLED) 974 goto err_exit; 975 976 /* sanity check: dev should be NULL when hot-plugged in */ 977 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 978 if (dev) { 979 /* This case shouldn't happen */ 980 err("pci_dev structure already exists.\n"); 981 pci_dev_put(dev); 982 retval = -1; 983 goto err_exit; 984 } 985 986 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 987 if (num == 0) { 988 err("No new device found\n"); 989 retval = -1; 990 goto err_exit; 991 } 992 993 max = acpiphp_max_busnr(bus); 994 for (pass = 0; pass < 2; pass++) { 995 list_for_each_entry(dev, &bus->devices, bus_list) { 996 if (PCI_SLOT(dev->devfn) != slot->device) 997 continue; 998 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 999 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 1000 max = pci_scan_bridge(bus, dev, max, pass); 1001 if (pass && dev->subordinate) 1002 pci_bus_size_bridges(dev->subordinate); 1003 } 1004 } 1005 } 1006 1007 list_for_each (l, &slot->funcs) { 1008 func = list_entry(l, struct acpiphp_func, sibling); 1009 acpiphp_bus_add(func); 1010 } 1011 1012 pci_bus_assign_resources(bus); 1013 acpiphp_sanitize_bus(bus); 1014 pci_enable_bridges(bus); 1015 pci_bus_add_devices(bus); 1016 acpiphp_set_hpp_values(slot->bridge->handle, bus); 1017 acpiphp_configure_ioapics(slot->bridge->handle); 1018 1019 /* associate pci_dev to our representation */ 1020 list_for_each (l, &slot->funcs) { 1021 func = list_entry(l, struct acpiphp_func, sibling); 1022 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 1023 func->function)); 1024 if (!func->pci_dev) 1025 continue; 1026 1027 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 1028 func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) 1029 continue; 1030 1031 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 1032 if (ACPI_FAILURE(status)) 1033 warn("find_p2p_bridge failed (error code = 0x%x)\n", 1034 status); 1035 } 1036 1037 slot->flags |= SLOT_ENABLED; 1038 1039 err_exit: 1040 return retval; 1041 } 1042 1043 1044 /** 1045 * disable_device - disable a slot 1046 */ 1047 static int disable_device(struct acpiphp_slot *slot) 1048 { 1049 int retval = 0; 1050 struct acpiphp_func *func; 1051 struct list_head *l; 1052 1053 /* is this slot already disabled? */ 1054 if (!(slot->flags & SLOT_ENABLED)) 1055 goto err_exit; 1056 1057 list_for_each (l, &slot->funcs) { 1058 func = list_entry(l, struct acpiphp_func, sibling); 1059 1060 if (func->bridge) { 1061 /* cleanup p2p bridges under this P2P bridge */ 1062 cleanup_p2p_bridge(func->bridge->handle, 1063 (u32)1, NULL, NULL); 1064 func->bridge = NULL; 1065 } 1066 1067 acpiphp_bus_trim(func->handle); 1068 /* try to remove anyway. 1069 * acpiphp_bus_add might have been failed */ 1070 1071 if (!func->pci_dev) 1072 continue; 1073 1074 pci_remove_bus_device(func->pci_dev); 1075 pci_dev_put(func->pci_dev); 1076 func->pci_dev = NULL; 1077 } 1078 1079 slot->flags &= (~SLOT_ENABLED); 1080 1081 err_exit: 1082 return retval; 1083 } 1084 1085 1086 /** 1087 * get_slot_status - get ACPI slot status 1088 * 1089 * if a slot has _STA for each function and if any one of them 1090 * returned non-zero status, return it 1091 * 1092 * if a slot doesn't have _STA and if any one of its functions' 1093 * configuration space is configured, return 0x0f as a _STA 1094 * 1095 * otherwise return 0 1096 */ 1097 static unsigned int get_slot_status(struct acpiphp_slot *slot) 1098 { 1099 acpi_status status; 1100 unsigned long sta = 0; 1101 u32 dvid; 1102 struct list_head *l; 1103 struct acpiphp_func *func; 1104 1105 list_for_each (l, &slot->funcs) { 1106 func = list_entry(l, struct acpiphp_func, sibling); 1107 1108 if (func->flags & FUNC_HAS_STA) { 1109 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 1110 if (ACPI_SUCCESS(status) && sta) 1111 break; 1112 } else { 1113 pci_bus_read_config_dword(slot->bridge->pci_bus, 1114 PCI_DEVFN(slot->device, 1115 func->function), 1116 PCI_VENDOR_ID, &dvid); 1117 if (dvid != 0xffffffff) { 1118 sta = ACPI_STA_ALL; 1119 break; 1120 } 1121 } 1122 } 1123 1124 return (unsigned int)sta; 1125 } 1126 1127 /** 1128 * acpiphp_eject_slot - physically eject the slot 1129 */ 1130 static int acpiphp_eject_slot(struct acpiphp_slot *slot) 1131 { 1132 acpi_status status; 1133 struct acpiphp_func *func; 1134 struct list_head *l; 1135 struct acpi_object_list arg_list; 1136 union acpi_object arg; 1137 1138 list_for_each (l, &slot->funcs) { 1139 func = list_entry(l, struct acpiphp_func, sibling); 1140 1141 /* We don't want to call _EJ0 on non-existing functions. */ 1142 if ((func->flags & FUNC_HAS_EJ0)) { 1143 /* _EJ0 method take one argument */ 1144 arg_list.count = 1; 1145 arg_list.pointer = &arg; 1146 arg.type = ACPI_TYPE_INTEGER; 1147 arg.integer.value = 1; 1148 1149 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1150 if (ACPI_FAILURE(status)) { 1151 warn("%s: _EJ0 failed\n", __FUNCTION__); 1152 return -1; 1153 } else 1154 break; 1155 } 1156 } 1157 return 0; 1158 } 1159 1160 /** 1161 * acpiphp_check_bridge - re-enumerate devices 1162 * 1163 * Iterate over all slots under this bridge and make sure that if a 1164 * card is present they are enabled, and if not they are disabled. 1165 */ 1166 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1167 { 1168 struct acpiphp_slot *slot; 1169 int retval = 0; 1170 int enabled, disabled; 1171 1172 enabled = disabled = 0; 1173 1174 for (slot = bridge->slots; slot; slot = slot->next) { 1175 unsigned int status = get_slot_status(slot); 1176 if (slot->flags & SLOT_ENABLED) { 1177 if (status == ACPI_STA_ALL) 1178 continue; 1179 retval = acpiphp_disable_slot(slot); 1180 if (retval) { 1181 err("Error occurred in disabling\n"); 1182 goto err_exit; 1183 } else { 1184 acpiphp_eject_slot(slot); 1185 } 1186 disabled++; 1187 } else { 1188 if (status != ACPI_STA_ALL) 1189 continue; 1190 retval = acpiphp_enable_slot(slot); 1191 if (retval) { 1192 err("Error occurred in enabling\n"); 1193 goto err_exit; 1194 } 1195 enabled++; 1196 } 1197 } 1198 1199 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); 1200 1201 err_exit: 1202 return retval; 1203 } 1204 1205 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) 1206 { 1207 u16 pci_cmd, pci_bctl; 1208 struct pci_dev *cdev; 1209 1210 /* Program hpp values for this device */ 1211 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 1212 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 1213 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 1214 return; 1215 1216 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 1217 bridge->hpp.t0->cache_line_size); 1218 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 1219 bridge->hpp.t0->latency_timer); 1220 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 1221 if (bridge->hpp.t0->enable_serr) 1222 pci_cmd |= PCI_COMMAND_SERR; 1223 else 1224 pci_cmd &= ~PCI_COMMAND_SERR; 1225 if (bridge->hpp.t0->enable_perr) 1226 pci_cmd |= PCI_COMMAND_PARITY; 1227 else 1228 pci_cmd &= ~PCI_COMMAND_PARITY; 1229 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 1230 1231 /* Program bridge control value and child devices */ 1232 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 1233 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 1234 bridge->hpp.t0->latency_timer); 1235 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 1236 if (bridge->hpp.t0->enable_serr) 1237 pci_bctl |= PCI_BRIDGE_CTL_SERR; 1238 else 1239 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 1240 if (bridge->hpp.t0->enable_perr) 1241 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 1242 else 1243 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 1244 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 1245 if (dev->subordinate) { 1246 list_for_each_entry(cdev, &dev->subordinate->devices, 1247 bus_list) 1248 program_hpp(cdev, bridge); 1249 } 1250 } 1251 } 1252 1253 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) 1254 { 1255 struct acpiphp_bridge bridge; 1256 struct pci_dev *dev; 1257 1258 memset(&bridge, 0, sizeof(bridge)); 1259 bridge.handle = handle; 1260 bridge.pci_bus = bus; 1261 bridge.pci_dev = bus->self; 1262 decode_hpp(&bridge); 1263 list_for_each_entry(dev, &bus->devices, bus_list) 1264 program_hpp(dev, &bridge); 1265 1266 } 1267 1268 /* 1269 * Remove devices for which we could not assign resources, call 1270 * arch specific code to fix-up the bus 1271 */ 1272 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1273 { 1274 struct pci_dev *dev; 1275 int i; 1276 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1277 1278 list_for_each_entry(dev, &bus->devices, bus_list) { 1279 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1280 struct resource *res = &dev->resource[i]; 1281 if ((res->flags & type_mask) && !res->start && 1282 res->end) { 1283 /* Could not assign a required resources 1284 * for this device, remove it */ 1285 pci_remove_bus_device(dev); 1286 break; 1287 } 1288 } 1289 } 1290 } 1291 1292 /* Program resources in newly inserted bridge */ 1293 static int acpiphp_configure_bridge (acpi_handle handle) 1294 { 1295 struct acpi_pci_id pci_id; 1296 struct pci_bus *bus; 1297 1298 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { 1299 err("cannot get PCI domain and bus number for bridge\n"); 1300 return -EINVAL; 1301 } 1302 bus = pci_find_bus(pci_id.segment, pci_id.bus); 1303 if (!bus) { 1304 err("cannot find bus %d:%d\n", 1305 pci_id.segment, pci_id.bus); 1306 return -EINVAL; 1307 } 1308 1309 pci_bus_size_bridges(bus); 1310 pci_bus_assign_resources(bus); 1311 acpiphp_sanitize_bus(bus); 1312 acpiphp_set_hpp_values(handle, bus); 1313 pci_enable_bridges(bus); 1314 acpiphp_configure_ioapics(handle); 1315 return 0; 1316 } 1317 1318 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1319 { 1320 struct acpi_device *device, *pdevice; 1321 acpi_handle phandle; 1322 1323 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1324 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1325 err("unexpected notification type %d\n", type); 1326 return; 1327 } 1328 1329 acpi_get_parent(handle, &phandle); 1330 if (acpi_bus_get_device(phandle, &pdevice)) { 1331 dbg("no parent device, assuming NULL\n"); 1332 pdevice = NULL; 1333 } 1334 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1335 err("cannot add bridge to acpi list\n"); 1336 return; 1337 } 1338 if (!acpiphp_configure_bridge(handle) && 1339 !acpi_bus_start(device)) 1340 add_bridge(handle); 1341 else 1342 err("cannot configure and start bridge\n"); 1343 1344 } 1345 1346 /* 1347 * ACPI event handlers 1348 */ 1349 1350 /** 1351 * handle_hotplug_event_bridge - handle ACPI event on bridges 1352 * 1353 * @handle: Notify()'ed acpi_handle 1354 * @type: Notify code 1355 * @context: pointer to acpiphp_bridge structure 1356 * 1357 * handles ACPI event notification on {host,p2p} bridges 1358 * 1359 */ 1360 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) 1361 { 1362 struct acpiphp_bridge *bridge; 1363 char objname[64]; 1364 struct acpi_buffer buffer = { .length = sizeof(objname), 1365 .pointer = objname }; 1366 struct acpi_device *device; 1367 1368 if (acpi_bus_get_device(handle, &device)) { 1369 /* This bridge must have just been physically inserted */ 1370 handle_bridge_insertion(handle, type); 1371 return; 1372 } 1373 1374 bridge = acpiphp_handle_to_bridge(handle); 1375 if (!bridge) { 1376 err("cannot get bridge info\n"); 1377 return; 1378 } 1379 1380 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1381 1382 switch (type) { 1383 case ACPI_NOTIFY_BUS_CHECK: 1384 /* bus re-enumerate */ 1385 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1386 acpiphp_check_bridge(bridge); 1387 break; 1388 1389 case ACPI_NOTIFY_DEVICE_CHECK: 1390 /* device check */ 1391 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1392 acpiphp_check_bridge(bridge); 1393 break; 1394 1395 case ACPI_NOTIFY_DEVICE_WAKE: 1396 /* wake event */ 1397 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1398 break; 1399 1400 case ACPI_NOTIFY_EJECT_REQUEST: 1401 /* request device eject */ 1402 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1403 if ((bridge->type != BRIDGE_TYPE_HOST) && 1404 (bridge->flags & BRIDGE_HAS_EJ0)) { 1405 struct acpiphp_slot *slot; 1406 slot = bridge->func->slot; 1407 if (!acpiphp_disable_slot(slot)) 1408 acpiphp_eject_slot(slot); 1409 } 1410 break; 1411 1412 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1413 printk(KERN_ERR "Device %s cannot be configured due" 1414 " to a frequency mismatch\n", objname); 1415 break; 1416 1417 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1418 printk(KERN_ERR "Device %s cannot be configured due" 1419 " to a bus mode mismatch\n", objname); 1420 break; 1421 1422 case ACPI_NOTIFY_POWER_FAULT: 1423 printk(KERN_ERR "Device %s has suffered a power fault\n", 1424 objname); 1425 break; 1426 1427 default: 1428 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1429 break; 1430 } 1431 } 1432 1433 /** 1434 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1435 * 1436 * @handle: Notify()'ed acpi_handle 1437 * @type: Notify code 1438 * @context: pointer to acpiphp_func structure 1439 * 1440 * handles ACPI event notification on slots 1441 * 1442 */ 1443 void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) 1444 { 1445 struct acpiphp_func *func; 1446 char objname[64]; 1447 struct acpi_buffer buffer = { .length = sizeof(objname), 1448 .pointer = objname }; 1449 1450 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1451 1452 func = (struct acpiphp_func *)context; 1453 1454 switch (type) { 1455 case ACPI_NOTIFY_BUS_CHECK: 1456 /* bus re-enumerate */ 1457 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1458 acpiphp_enable_slot(func->slot); 1459 break; 1460 1461 case ACPI_NOTIFY_DEVICE_CHECK: 1462 /* device check : re-enumerate from parent bus */ 1463 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1464 acpiphp_check_bridge(func->slot->bridge); 1465 break; 1466 1467 case ACPI_NOTIFY_DEVICE_WAKE: 1468 /* wake event */ 1469 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1470 break; 1471 1472 case ACPI_NOTIFY_EJECT_REQUEST: 1473 /* request device eject */ 1474 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1475 if (!(acpiphp_disable_slot(func->slot))) 1476 acpiphp_eject_slot(func->slot); 1477 break; 1478 1479 default: 1480 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1481 break; 1482 } 1483 } 1484 1485 1486 static acpi_status 1487 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1488 { 1489 int *count = (int *)context; 1490 1491 if (acpi_root_bridge(handle)) { 1492 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1493 handle_hotplug_event_bridge, NULL); 1494 (*count)++; 1495 } 1496 return AE_OK ; 1497 } 1498 1499 static struct acpi_pci_driver acpi_pci_hp_driver = { 1500 .add = add_bridge, 1501 .remove = remove_bridge, 1502 }; 1503 1504 /** 1505 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1506 * 1507 */ 1508 int __init acpiphp_glue_init(void) 1509 { 1510 int num = 0; 1511 1512 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1513 ACPI_UINT32_MAX, find_root_bridges, &num, NULL); 1514 1515 if (num <= 0) 1516 return -1; 1517 else 1518 acpi_pci_register_driver(&acpi_pci_hp_driver); 1519 1520 return 0; 1521 } 1522 1523 1524 /** 1525 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1526 * 1527 * This function frees all data allocated in acpiphp_glue_init() 1528 */ 1529 void __exit acpiphp_glue_exit(void) 1530 { 1531 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1532 } 1533 1534 1535 /** 1536 * acpiphp_get_num_slots - count number of slots in a system 1537 */ 1538 int __init acpiphp_get_num_slots(void) 1539 { 1540 struct list_head *node; 1541 struct acpiphp_bridge *bridge; 1542 int num_slots; 1543 1544 num_slots = 0; 1545 1546 list_for_each (node, &bridge_list) { 1547 bridge = (struct acpiphp_bridge *)node; 1548 dbg("Bus %04x:%02x has %d slot%s\n", 1549 pci_domain_nr(bridge->pci_bus), 1550 bridge->pci_bus->number, bridge->nr_slots, 1551 bridge->nr_slots == 1 ? "" : "s"); 1552 num_slots += bridge->nr_slots; 1553 } 1554 1555 dbg("Total %d slots\n", num_slots); 1556 return num_slots; 1557 } 1558 1559 1560 #if 0 1561 /** 1562 * acpiphp_for_each_slot - call function for each slot 1563 * @fn: callback function 1564 * @data: context to be passed to callback function 1565 * 1566 */ 1567 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1568 { 1569 struct list_head *node; 1570 struct acpiphp_bridge *bridge; 1571 struct acpiphp_slot *slot; 1572 int retval = 0; 1573 1574 list_for_each (node, &bridge_list) { 1575 bridge = (struct acpiphp_bridge *)node; 1576 for (slot = bridge->slots; slot; slot = slot->next) { 1577 retval = fn(slot, data); 1578 if (!retval) 1579 goto err_exit; 1580 } 1581 } 1582 1583 err_exit: 1584 return retval; 1585 } 1586 #endif 1587 1588 1589 /** 1590 * acpiphp_enable_slot - power on slot 1591 */ 1592 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1593 { 1594 int retval; 1595 1596 mutex_lock(&slot->crit_sect); 1597 1598 /* wake up all functions */ 1599 retval = power_on_slot(slot); 1600 if (retval) 1601 goto err_exit; 1602 1603 if (get_slot_status(slot) == ACPI_STA_ALL) { 1604 /* configure all functions */ 1605 retval = enable_device(slot); 1606 if (retval) 1607 power_off_slot(slot); 1608 } else { 1609 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__); 1610 power_off_slot(slot); 1611 } 1612 1613 err_exit: 1614 mutex_unlock(&slot->crit_sect); 1615 return retval; 1616 } 1617 1618 /** 1619 * acpiphp_disable_slot - power off slot 1620 */ 1621 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1622 { 1623 int retval = 0; 1624 1625 mutex_lock(&slot->crit_sect); 1626 1627 /* unconfigure all functions */ 1628 retval = disable_device(slot); 1629 if (retval) 1630 goto err_exit; 1631 1632 /* power off all functions */ 1633 retval = power_off_slot(slot); 1634 if (retval) 1635 goto err_exit; 1636 1637 err_exit: 1638 mutex_unlock(&slot->crit_sect); 1639 return retval; 1640 } 1641 1642 1643 /* 1644 * slot enabled: 1 1645 * slot disabled: 0 1646 */ 1647 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1648 { 1649 return (slot->flags & SLOT_POWEREDON); 1650 } 1651 1652 1653 /* 1654 * latch closed: 1 1655 * latch open: 0 1656 */ 1657 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1658 { 1659 unsigned int sta; 1660 1661 sta = get_slot_status(slot); 1662 1663 return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0; 1664 } 1665 1666 1667 /* 1668 * adapter presence : 1 1669 * absence : 0 1670 */ 1671 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1672 { 1673 unsigned int sta; 1674 1675 sta = get_slot_status(slot); 1676 1677 return (sta == 0) ? 0 : 1; 1678 } 1679 1680 1681 /* 1682 * pci address (seg/bus/dev) 1683 */ 1684 u32 acpiphp_get_address(struct acpiphp_slot *slot) 1685 { 1686 u32 address; 1687 struct pci_bus *pci_bus = slot->bridge->pci_bus; 1688 1689 address = (pci_domain_nr(pci_bus) << 16) | 1690 (pci_bus->number << 8) | 1691 slot->device; 1692 1693 return address; 1694 } 1695