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/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 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); 63 64 65 /* 66 * initialization & terminatation routines 67 */ 68 69 /** 70 * is_ejectable - determine if a slot is ejectable 71 * @handle: handle to acpi namespace 72 * 73 * Ejectable slot should satisfy at least these conditions: 74 * 75 * 1. has _ADR method 76 * 2. has _EJ0 method 77 * 78 * optionally 79 * 80 * 1. has _STA method 81 * 2. has _PS0 method 82 * 3. has _PS3 method 83 * 4. .. 84 * 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 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 existance 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 (((acpi_table_entry_header *)table)->type) { 775 case ACPI_MADT_IOSAPIC: 776 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base; 777 result = 0; 778 break; 779 case ACPI_MADT_IOAPIC: 780 *gsi_base = ((struct acpi_table_ioapic *)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; 800 801 /* Evaluate _STA if present */ 802 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 803 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 804 return AE_CTRL_DEPTH; 805 806 /* Scan only PCI bus scope */ 807 status = acpi_get_handle(handle, "_HID", &tmp); 808 if (ACPI_SUCCESS(status)) 809 return AE_CTRL_DEPTH; 810 811 if (get_gsi_base(handle, &gsi_base)) 812 return AE_OK; 813 814 pdev = get_apic_pci_info(handle); 815 if (!pdev) 816 return AE_OK; 817 818 if (pci_enable_device(pdev)) { 819 pci_dev_put(pdev); 820 return AE_OK; 821 } 822 823 pci_set_master(pdev); 824 825 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) { 826 pci_disable_device(pdev); 827 pci_dev_put(pdev); 828 return AE_OK; 829 } 830 831 phys_addr = pci_resource_start(pdev, 0); 832 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) { 833 pci_release_region(pdev, 0); 834 pci_disable_device(pdev); 835 pci_dev_put(pdev); 836 return AE_OK; 837 } 838 839 return AE_OK; 840 } 841 842 static int acpiphp_configure_ioapics(acpi_handle handle) 843 { 844 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 845 ACPI_UINT32_MAX, ioapic_add, NULL, NULL); 846 return 0; 847 } 848 849 static int power_on_slot(struct acpiphp_slot *slot) 850 { 851 acpi_status status; 852 struct acpiphp_func *func; 853 struct list_head *l; 854 int retval = 0; 855 856 /* if already enabled, just skip */ 857 if (slot->flags & SLOT_POWEREDON) 858 goto err_exit; 859 860 list_for_each (l, &slot->funcs) { 861 func = list_entry(l, struct acpiphp_func, sibling); 862 863 if (func->flags & FUNC_HAS_PS0) { 864 dbg("%s: executing _PS0\n", __FUNCTION__); 865 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 866 if (ACPI_FAILURE(status)) { 867 warn("%s: _PS0 failed\n", __FUNCTION__); 868 retval = -1; 869 goto err_exit; 870 } else 871 break; 872 } 873 } 874 875 /* TBD: evaluate _STA to check if the slot is enabled */ 876 877 slot->flags |= SLOT_POWEREDON; 878 879 err_exit: 880 return retval; 881 } 882 883 884 static int power_off_slot(struct acpiphp_slot *slot) 885 { 886 acpi_status status; 887 struct acpiphp_func *func; 888 struct list_head *l; 889 890 int retval = 0; 891 892 /* if already disabled, just skip */ 893 if ((slot->flags & SLOT_POWEREDON) == 0) 894 goto err_exit; 895 896 list_for_each (l, &slot->funcs) { 897 func = list_entry(l, struct acpiphp_func, sibling); 898 899 if (func->flags & FUNC_HAS_PS3) { 900 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 901 if (ACPI_FAILURE(status)) { 902 warn("%s: _PS3 failed\n", __FUNCTION__); 903 retval = -1; 904 goto err_exit; 905 } else 906 break; 907 } 908 } 909 910 /* TBD: evaluate _STA to check if the slot is disabled */ 911 912 slot->flags &= (~SLOT_POWEREDON); 913 914 err_exit: 915 return retval; 916 } 917 918 919 920 /** 921 * acpiphp_max_busnr - return the highest reserved bus number under 922 * the given bus. 923 * @bus: bus to start search with 924 * 925 */ 926 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 927 { 928 struct list_head *tmp; 929 unsigned char max, n; 930 931 /* 932 * pci_bus_max_busnr will return the highest 933 * reserved busnr for all these children. 934 * that is equivalent to the bus->subordinate 935 * value. We don't want to use the parent's 936 * bus->subordinate value because it could have 937 * padding in it. 938 */ 939 max = bus->secondary; 940 941 list_for_each(tmp, &bus->children) { 942 n = pci_bus_max_busnr(pci_bus_b(tmp)); 943 if (n > max) 944 max = n; 945 } 946 return max; 947 } 948 949 950 /** 951 * acpiphp_bus_add - add a new bus to acpi subsystem 952 * @func: acpiphp_func of the bridge 953 * 954 */ 955 static int acpiphp_bus_add(struct acpiphp_func *func) 956 { 957 acpi_handle phandle; 958 struct acpi_device *device, *pdevice; 959 int ret_val; 960 961 acpi_get_parent(func->handle, &phandle); 962 if (acpi_bus_get_device(phandle, &pdevice)) { 963 dbg("no parent device, assuming NULL\n"); 964 pdevice = NULL; 965 } 966 if (!acpi_bus_get_device(func->handle, &device)) { 967 dbg("bus exists... trim\n"); 968 /* this shouldn't be in here, so remove 969 * the bus then re-add it... 970 */ 971 ret_val = acpi_bus_trim(device, 1); 972 dbg("acpi_bus_trim return %x\n", ret_val); 973 } 974 975 ret_val = acpi_bus_add(&device, pdevice, func->handle, 976 ACPI_BUS_TYPE_DEVICE); 977 if (ret_val) { 978 dbg("error adding bus, %x\n", 979 -ret_val); 980 goto acpiphp_bus_add_out; 981 } 982 /* 983 * try to start anyway. We could have failed to add 984 * simply because this bus had previously been added 985 * on another add. Don't bother with the return value 986 * we just keep going. 987 */ 988 ret_val = acpi_bus_start(device); 989 990 acpiphp_bus_add_out: 991 return ret_val; 992 } 993 994 995 /** 996 * acpiphp_bus_trim - trim a bus from acpi subsystem 997 * @handle: handle to acpi namespace 998 * 999 */ 1000 static int acpiphp_bus_trim(acpi_handle handle) 1001 { 1002 struct acpi_device *device; 1003 int retval; 1004 1005 retval = acpi_bus_get_device(handle, &device); 1006 if (retval) { 1007 dbg("acpi_device not found\n"); 1008 return retval; 1009 } 1010 1011 retval = acpi_bus_trim(device, 1); 1012 if (retval) 1013 err("cannot remove from acpi list\n"); 1014 1015 return retval; 1016 } 1017 1018 /** 1019 * enable_device - enable, configure a slot 1020 * @slot: slot to be enabled 1021 * 1022 * This function should be called per *physical slot*, 1023 * not per each slot object in ACPI namespace. 1024 * 1025 */ 1026 static int enable_device(struct acpiphp_slot *slot) 1027 { 1028 struct pci_dev *dev; 1029 struct pci_bus *bus = slot->bridge->pci_bus; 1030 struct list_head *l; 1031 struct acpiphp_func *func; 1032 int retval = 0; 1033 int num, max, pass; 1034 acpi_status status; 1035 1036 if (slot->flags & SLOT_ENABLED) 1037 goto err_exit; 1038 1039 /* sanity check: dev should be NULL when hot-plugged in */ 1040 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 1041 if (dev) { 1042 /* This case shouldn't happen */ 1043 err("pci_dev structure already exists.\n"); 1044 pci_dev_put(dev); 1045 retval = -1; 1046 goto err_exit; 1047 } 1048 1049 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 1050 if (num == 0) { 1051 err("No new device found\n"); 1052 retval = -1; 1053 goto err_exit; 1054 } 1055 1056 max = acpiphp_max_busnr(bus); 1057 for (pass = 0; pass < 2; pass++) { 1058 list_for_each_entry(dev, &bus->devices, bus_list) { 1059 if (PCI_SLOT(dev->devfn) != slot->device) 1060 continue; 1061 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 1062 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 1063 max = pci_scan_bridge(bus, dev, max, pass); 1064 if (pass && dev->subordinate) 1065 pci_bus_size_bridges(dev->subordinate); 1066 } 1067 } 1068 } 1069 1070 list_for_each (l, &slot->funcs) { 1071 func = list_entry(l, struct acpiphp_func, sibling); 1072 acpiphp_bus_add(func); 1073 } 1074 1075 pci_bus_assign_resources(bus); 1076 acpiphp_sanitize_bus(bus); 1077 acpiphp_set_hpp_values(slot->bridge->handle, bus); 1078 acpiphp_configure_ioapics(slot->bridge->handle); 1079 pci_enable_bridges(bus); 1080 pci_bus_add_devices(bus); 1081 1082 /* associate pci_dev to our representation */ 1083 list_for_each (l, &slot->funcs) { 1084 func = list_entry(l, struct acpiphp_func, sibling); 1085 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 1086 func->function)); 1087 if (!func->pci_dev) 1088 continue; 1089 1090 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 1091 func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) 1092 continue; 1093 1094 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 1095 if (ACPI_FAILURE(status)) 1096 warn("find_p2p_bridge failed (error code = 0x%x)\n", 1097 status); 1098 } 1099 1100 slot->flags |= SLOT_ENABLED; 1101 1102 err_exit: 1103 return retval; 1104 } 1105 1106 1107 /** 1108 * disable_device - disable a slot 1109 */ 1110 static int disable_device(struct acpiphp_slot *slot) 1111 { 1112 int retval = 0; 1113 struct acpiphp_func *func; 1114 struct list_head *l; 1115 1116 /* is this slot already disabled? */ 1117 if (!(slot->flags & SLOT_ENABLED)) 1118 goto err_exit; 1119 1120 list_for_each (l, &slot->funcs) { 1121 func = list_entry(l, struct acpiphp_func, sibling); 1122 1123 if (func->bridge) { 1124 /* cleanup p2p bridges under this P2P bridge */ 1125 cleanup_p2p_bridge(func->bridge->handle, 1126 (u32)1, NULL, NULL); 1127 func->bridge = NULL; 1128 } 1129 1130 acpiphp_bus_trim(func->handle); 1131 /* try to remove anyway. 1132 * acpiphp_bus_add might have been failed */ 1133 1134 if (!func->pci_dev) 1135 continue; 1136 1137 pci_remove_bus_device(func->pci_dev); 1138 pci_dev_put(func->pci_dev); 1139 func->pci_dev = NULL; 1140 } 1141 1142 slot->flags &= (~SLOT_ENABLED); 1143 1144 err_exit: 1145 return retval; 1146 } 1147 1148 1149 /** 1150 * get_slot_status - get ACPI slot status 1151 * 1152 * if a slot has _STA for each function and if any one of them 1153 * returned non-zero status, return it 1154 * 1155 * if a slot doesn't have _STA and if any one of its functions' 1156 * configuration space is configured, return 0x0f as a _STA 1157 * 1158 * otherwise return 0 1159 */ 1160 static unsigned int get_slot_status(struct acpiphp_slot *slot) 1161 { 1162 acpi_status status; 1163 unsigned long sta = 0; 1164 u32 dvid; 1165 struct list_head *l; 1166 struct acpiphp_func *func; 1167 1168 list_for_each (l, &slot->funcs) { 1169 func = list_entry(l, struct acpiphp_func, sibling); 1170 1171 if (func->flags & FUNC_HAS_STA) { 1172 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 1173 if (ACPI_SUCCESS(status) && sta) 1174 break; 1175 } else { 1176 pci_bus_read_config_dword(slot->bridge->pci_bus, 1177 PCI_DEVFN(slot->device, 1178 func->function), 1179 PCI_VENDOR_ID, &dvid); 1180 if (dvid != 0xffffffff) { 1181 sta = ACPI_STA_ALL; 1182 break; 1183 } 1184 } 1185 } 1186 1187 return (unsigned int)sta; 1188 } 1189 1190 /** 1191 * acpiphp_eject_slot - physically eject the slot 1192 */ 1193 static int acpiphp_eject_slot(struct acpiphp_slot *slot) 1194 { 1195 acpi_status status; 1196 struct acpiphp_func *func; 1197 struct list_head *l; 1198 struct acpi_object_list arg_list; 1199 union acpi_object arg; 1200 1201 list_for_each (l, &slot->funcs) { 1202 func = list_entry(l, struct acpiphp_func, sibling); 1203 1204 /* We don't want to call _EJ0 on non-existing functions. */ 1205 if ((func->flags & FUNC_HAS_EJ0)) { 1206 /* _EJ0 method take one argument */ 1207 arg_list.count = 1; 1208 arg_list.pointer = &arg; 1209 arg.type = ACPI_TYPE_INTEGER; 1210 arg.integer.value = 1; 1211 1212 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1213 if (ACPI_FAILURE(status)) { 1214 warn("%s: _EJ0 failed\n", __FUNCTION__); 1215 return -1; 1216 } else 1217 break; 1218 } 1219 } 1220 return 0; 1221 } 1222 1223 /** 1224 * acpiphp_check_bridge - re-enumerate devices 1225 * 1226 * Iterate over all slots under this bridge and make sure that if a 1227 * card is present they are enabled, and if not they are disabled. 1228 */ 1229 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1230 { 1231 struct acpiphp_slot *slot; 1232 int retval = 0; 1233 int enabled, disabled; 1234 1235 enabled = disabled = 0; 1236 1237 for (slot = bridge->slots; slot; slot = slot->next) { 1238 unsigned int status = get_slot_status(slot); 1239 if (slot->flags & SLOT_ENABLED) { 1240 if (status == ACPI_STA_ALL) 1241 continue; 1242 retval = acpiphp_disable_slot(slot); 1243 if (retval) { 1244 err("Error occurred in disabling\n"); 1245 goto err_exit; 1246 } else { 1247 acpiphp_eject_slot(slot); 1248 } 1249 disabled++; 1250 } else { 1251 if (status != ACPI_STA_ALL) 1252 continue; 1253 retval = acpiphp_enable_slot(slot); 1254 if (retval) { 1255 err("Error occurred in enabling\n"); 1256 goto err_exit; 1257 } 1258 enabled++; 1259 } 1260 } 1261 1262 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); 1263 1264 err_exit: 1265 return retval; 1266 } 1267 1268 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) 1269 { 1270 u16 pci_cmd, pci_bctl; 1271 struct pci_dev *cdev; 1272 1273 /* Program hpp values for this device */ 1274 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 1275 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 1276 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 1277 return; 1278 1279 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 1280 bridge->hpp.t0->cache_line_size); 1281 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 1282 bridge->hpp.t0->latency_timer); 1283 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 1284 if (bridge->hpp.t0->enable_serr) 1285 pci_cmd |= PCI_COMMAND_SERR; 1286 else 1287 pci_cmd &= ~PCI_COMMAND_SERR; 1288 if (bridge->hpp.t0->enable_perr) 1289 pci_cmd |= PCI_COMMAND_PARITY; 1290 else 1291 pci_cmd &= ~PCI_COMMAND_PARITY; 1292 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 1293 1294 /* Program bridge control value and child devices */ 1295 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 1296 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 1297 bridge->hpp.t0->latency_timer); 1298 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 1299 if (bridge->hpp.t0->enable_serr) 1300 pci_bctl |= PCI_BRIDGE_CTL_SERR; 1301 else 1302 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 1303 if (bridge->hpp.t0->enable_perr) 1304 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 1305 else 1306 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 1307 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 1308 if (dev->subordinate) { 1309 list_for_each_entry(cdev, &dev->subordinate->devices, 1310 bus_list) 1311 program_hpp(cdev, bridge); 1312 } 1313 } 1314 } 1315 1316 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) 1317 { 1318 struct acpiphp_bridge bridge; 1319 struct pci_dev *dev; 1320 1321 memset(&bridge, 0, sizeof(bridge)); 1322 bridge.handle = handle; 1323 bridge.pci_bus = bus; 1324 bridge.pci_dev = bus->self; 1325 decode_hpp(&bridge); 1326 list_for_each_entry(dev, &bus->devices, bus_list) 1327 program_hpp(dev, &bridge); 1328 1329 } 1330 1331 /* 1332 * Remove devices for which we could not assign resources, call 1333 * arch specific code to fix-up the bus 1334 */ 1335 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1336 { 1337 struct pci_dev *dev; 1338 int i; 1339 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1340 1341 list_for_each_entry(dev, &bus->devices, bus_list) { 1342 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1343 struct resource *res = &dev->resource[i]; 1344 if ((res->flags & type_mask) && !res->start && 1345 res->end) { 1346 /* Could not assign a required resources 1347 * for this device, remove it */ 1348 pci_remove_bus_device(dev); 1349 break; 1350 } 1351 } 1352 } 1353 } 1354 1355 /* Program resources in newly inserted bridge */ 1356 static int acpiphp_configure_bridge (acpi_handle handle) 1357 { 1358 struct acpi_pci_id pci_id; 1359 struct pci_bus *bus; 1360 1361 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { 1362 err("cannot get PCI domain and bus number for bridge\n"); 1363 return -EINVAL; 1364 } 1365 bus = pci_find_bus(pci_id.segment, pci_id.bus); 1366 if (!bus) { 1367 err("cannot find bus %d:%d\n", 1368 pci_id.segment, pci_id.bus); 1369 return -EINVAL; 1370 } 1371 1372 pci_bus_size_bridges(bus); 1373 pci_bus_assign_resources(bus); 1374 acpiphp_sanitize_bus(bus); 1375 acpiphp_set_hpp_values(handle, bus); 1376 pci_enable_bridges(bus); 1377 acpiphp_configure_ioapics(handle); 1378 return 0; 1379 } 1380 1381 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1382 { 1383 struct acpi_device *device, *pdevice; 1384 acpi_handle phandle; 1385 1386 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1387 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1388 err("unexpected notification type %d\n", type); 1389 return; 1390 } 1391 1392 acpi_get_parent(handle, &phandle); 1393 if (acpi_bus_get_device(phandle, &pdevice)) { 1394 dbg("no parent device, assuming NULL\n"); 1395 pdevice = NULL; 1396 } 1397 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1398 err("cannot add bridge to acpi list\n"); 1399 return; 1400 } 1401 if (!acpiphp_configure_bridge(handle) && 1402 !acpi_bus_start(device)) 1403 add_bridge(handle); 1404 else 1405 err("cannot configure and start bridge\n"); 1406 1407 } 1408 1409 /* 1410 * ACPI event handlers 1411 */ 1412 1413 /** 1414 * handle_hotplug_event_bridge - handle ACPI event on bridges 1415 * 1416 * @handle: Notify()'ed acpi_handle 1417 * @type: Notify code 1418 * @context: pointer to acpiphp_bridge structure 1419 * 1420 * handles ACPI event notification on {host,p2p} bridges 1421 * 1422 */ 1423 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) 1424 { 1425 struct acpiphp_bridge *bridge; 1426 char objname[64]; 1427 struct acpi_buffer buffer = { .length = sizeof(objname), 1428 .pointer = objname }; 1429 struct acpi_device *device; 1430 1431 if (acpi_bus_get_device(handle, &device)) { 1432 /* This bridge must have just been physically inserted */ 1433 handle_bridge_insertion(handle, type); 1434 return; 1435 } 1436 1437 bridge = acpiphp_handle_to_bridge(handle); 1438 if (!bridge) { 1439 err("cannot get bridge info\n"); 1440 return; 1441 } 1442 1443 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1444 1445 switch (type) { 1446 case ACPI_NOTIFY_BUS_CHECK: 1447 /* bus re-enumerate */ 1448 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1449 acpiphp_check_bridge(bridge); 1450 break; 1451 1452 case ACPI_NOTIFY_DEVICE_CHECK: 1453 /* device check */ 1454 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1455 acpiphp_check_bridge(bridge); 1456 break; 1457 1458 case ACPI_NOTIFY_DEVICE_WAKE: 1459 /* wake event */ 1460 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1461 break; 1462 1463 case ACPI_NOTIFY_EJECT_REQUEST: 1464 /* request device eject */ 1465 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1466 if ((bridge->type != BRIDGE_TYPE_HOST) && 1467 (bridge->flags & BRIDGE_HAS_EJ0)) { 1468 struct acpiphp_slot *slot; 1469 slot = bridge->func->slot; 1470 if (!acpiphp_disable_slot(slot)) 1471 acpiphp_eject_slot(slot); 1472 } 1473 break; 1474 1475 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1476 printk(KERN_ERR "Device %s cannot be configured due" 1477 " to a frequency mismatch\n", objname); 1478 break; 1479 1480 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1481 printk(KERN_ERR "Device %s cannot be configured due" 1482 " to a bus mode mismatch\n", objname); 1483 break; 1484 1485 case ACPI_NOTIFY_POWER_FAULT: 1486 printk(KERN_ERR "Device %s has suffered a power fault\n", 1487 objname); 1488 break; 1489 1490 default: 1491 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1492 break; 1493 } 1494 } 1495 1496 /** 1497 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1498 * 1499 * @handle: Notify()'ed acpi_handle 1500 * @type: Notify code 1501 * @context: pointer to acpiphp_func structure 1502 * 1503 * handles ACPI event notification on slots 1504 * 1505 */ 1506 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) 1507 { 1508 struct acpiphp_func *func; 1509 char objname[64]; 1510 struct acpi_buffer buffer = { .length = sizeof(objname), 1511 .pointer = objname }; 1512 1513 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1514 1515 func = (struct acpiphp_func *)context; 1516 1517 switch (type) { 1518 case ACPI_NOTIFY_BUS_CHECK: 1519 /* bus re-enumerate */ 1520 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1521 acpiphp_enable_slot(func->slot); 1522 break; 1523 1524 case ACPI_NOTIFY_DEVICE_CHECK: 1525 /* device check : re-enumerate from parent bus */ 1526 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1527 acpiphp_check_bridge(func->slot->bridge); 1528 break; 1529 1530 case ACPI_NOTIFY_DEVICE_WAKE: 1531 /* wake event */ 1532 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1533 break; 1534 1535 case ACPI_NOTIFY_EJECT_REQUEST: 1536 /* request device eject */ 1537 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1538 if (!(acpiphp_disable_slot(func->slot))) 1539 acpiphp_eject_slot(func->slot); 1540 break; 1541 1542 default: 1543 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1544 break; 1545 } 1546 } 1547 1548 1549 static acpi_status 1550 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1551 { 1552 int *count = (int *)context; 1553 1554 if (acpi_root_bridge(handle)) { 1555 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1556 handle_hotplug_event_bridge, NULL); 1557 (*count)++; 1558 } 1559 return AE_OK ; 1560 } 1561 1562 static struct acpi_pci_driver acpi_pci_hp_driver = { 1563 .add = add_bridge, 1564 .remove = remove_bridge, 1565 }; 1566 1567 /** 1568 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1569 * 1570 */ 1571 int __init acpiphp_glue_init(void) 1572 { 1573 int num = 0; 1574 1575 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1576 ACPI_UINT32_MAX, find_root_bridges, &num, NULL); 1577 1578 if (num <= 0) 1579 return -1; 1580 else 1581 acpi_pci_register_driver(&acpi_pci_hp_driver); 1582 1583 return 0; 1584 } 1585 1586 1587 /** 1588 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1589 * 1590 * This function frees all data allocated in acpiphp_glue_init() 1591 */ 1592 void __exit acpiphp_glue_exit(void) 1593 { 1594 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1595 } 1596 1597 1598 /** 1599 * acpiphp_get_num_slots - count number of slots in a system 1600 */ 1601 int __init acpiphp_get_num_slots(void) 1602 { 1603 struct list_head *node; 1604 struct acpiphp_bridge *bridge; 1605 int num_slots; 1606 1607 num_slots = 0; 1608 1609 list_for_each (node, &bridge_list) { 1610 bridge = (struct acpiphp_bridge *)node; 1611 dbg("Bus %04x:%02x has %d slot%s\n", 1612 pci_domain_nr(bridge->pci_bus), 1613 bridge->pci_bus->number, bridge->nr_slots, 1614 bridge->nr_slots == 1 ? "" : "s"); 1615 num_slots += bridge->nr_slots; 1616 } 1617 1618 dbg("Total %d slots\n", num_slots); 1619 return num_slots; 1620 } 1621 1622 1623 #if 0 1624 /** 1625 * acpiphp_for_each_slot - call function for each slot 1626 * @fn: callback function 1627 * @data: context to be passed to callback function 1628 * 1629 */ 1630 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1631 { 1632 struct list_head *node; 1633 struct acpiphp_bridge *bridge; 1634 struct acpiphp_slot *slot; 1635 int retval = 0; 1636 1637 list_for_each (node, &bridge_list) { 1638 bridge = (struct acpiphp_bridge *)node; 1639 for (slot = bridge->slots; slot; slot = slot->next) { 1640 retval = fn(slot, data); 1641 if (!retval) 1642 goto err_exit; 1643 } 1644 } 1645 1646 err_exit: 1647 return retval; 1648 } 1649 #endif 1650 1651 1652 /** 1653 * acpiphp_enable_slot - power on slot 1654 */ 1655 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1656 { 1657 int retval; 1658 1659 mutex_lock(&slot->crit_sect); 1660 1661 /* wake up all functions */ 1662 retval = power_on_slot(slot); 1663 if (retval) 1664 goto err_exit; 1665 1666 if (get_slot_status(slot) == ACPI_STA_ALL) { 1667 /* configure all functions */ 1668 retval = enable_device(slot); 1669 if (retval) 1670 power_off_slot(slot); 1671 } else { 1672 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__); 1673 power_off_slot(slot); 1674 } 1675 1676 err_exit: 1677 mutex_unlock(&slot->crit_sect); 1678 return retval; 1679 } 1680 1681 /** 1682 * acpiphp_disable_slot - power off slot 1683 */ 1684 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1685 { 1686 int retval = 0; 1687 1688 mutex_lock(&slot->crit_sect); 1689 1690 /* unconfigure all functions */ 1691 retval = disable_device(slot); 1692 if (retval) 1693 goto err_exit; 1694 1695 /* power off all functions */ 1696 retval = power_off_slot(slot); 1697 if (retval) 1698 goto err_exit; 1699 1700 err_exit: 1701 mutex_unlock(&slot->crit_sect); 1702 return retval; 1703 } 1704 1705 1706 /* 1707 * slot enabled: 1 1708 * slot disabled: 0 1709 */ 1710 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1711 { 1712 return (slot->flags & SLOT_POWEREDON); 1713 } 1714 1715 1716 /* 1717 * latch closed: 1 1718 * latch open: 0 1719 */ 1720 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1721 { 1722 unsigned int sta; 1723 1724 sta = get_slot_status(slot); 1725 1726 return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0; 1727 } 1728 1729 1730 /* 1731 * adapter presence : 1 1732 * absence : 0 1733 */ 1734 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1735 { 1736 unsigned int sta; 1737 1738 sta = get_slot_status(slot); 1739 1740 return (sta == 0) ? 0 : 1; 1741 } 1742 1743 1744 /* 1745 * pci address (seg/bus/dev) 1746 */ 1747 u32 acpiphp_get_address(struct acpiphp_slot *slot) 1748 { 1749 u32 address; 1750 struct pci_bus *pci_bus = slot->bridge->pci_bus; 1751 1752 address = (pci_domain_nr(pci_bus) << 16) | 1753 (pci_bus->number << 8) | 1754 slot->device; 1755 1756 return address; 1757 } 1758