1 /* 2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 3 * 4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 6 * Copyright (C) 2002,2003 NEC Corporation 7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) 8 * Copyright (C) 2003-2005 Hewlett Packard 9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 10 * Copyright (C) 2005 Intel Corporation 11 * 12 * All rights reserved. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or (at 17 * your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, but 20 * WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 22 * NON INFRINGEMENT. See the GNU General Public License for more 23 * details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Send feedback to <kristen.c.accardi@intel.com> 30 * 31 */ 32 33 /* 34 * Lifetime rules for pci_dev: 35 * - The one in acpiphp_func has its refcount elevated by pci_get_slot() 36 * when the driver is loaded or when an insertion event occurs. It loses 37 * a refcount when its ejected or the driver unloads. 38 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 39 * when the bridge is scanned and it loses a refcount when the bridge 40 * is removed. 41 */ 42 43 #include <linux/init.h> 44 #include <linux/module.h> 45 46 #include <linux/kernel.h> 47 #include <linux/pci.h> 48 #include <linux/pci_hotplug.h> 49 #include <linux/mutex.h> 50 51 #include "../pci.h" 52 #include "acpiphp.h" 53 54 static LIST_HEAD(bridge_list); 55 static LIST_HEAD(ioapic_list); 56 static DEFINE_SPINLOCK(ioapic_list_lock); 57 58 #define MY_NAME "acpiphp_glue" 59 60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *); 61 static void acpiphp_sanitize_bus(struct pci_bus *bus); 62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus); 63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); 64 65 66 /* 67 * initialization & terminatation routines 68 */ 69 70 /** 71 * is_ejectable - determine if a slot is ejectable 72 * @handle: handle to acpi namespace 73 * 74 * Ejectable slot should satisfy at least these conditions: 75 * 76 * 1. has _ADR method 77 * 2. has _EJ0 method 78 * 79 * optionally 80 * 81 * 1. has _STA method 82 * 2. has _PS0 method 83 * 3. has _PS3 method 84 * 4. .. 85 */ 86 static int is_ejectable(acpi_handle handle) 87 { 88 acpi_status status; 89 acpi_handle tmp; 90 91 status = acpi_get_handle(handle, "_ADR", &tmp); 92 if (ACPI_FAILURE(status)) { 93 return 0; 94 } 95 96 status = acpi_get_handle(handle, "_EJ0", &tmp); 97 if (ACPI_FAILURE(status)) { 98 return 0; 99 } 100 101 return 1; 102 } 103 104 105 /* callback routine to check for the existence of ejectable slots */ 106 static acpi_status 107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 108 { 109 int *count = (int *)context; 110 111 if (is_ejectable(handle)) { 112 (*count)++; 113 /* only one ejectable slot is enough */ 114 return AE_CTRL_TERMINATE; 115 } else { 116 return AE_OK; 117 } 118 } 119 120 /* callback routine to check for the existence of a pci dock device */ 121 static acpi_status 122 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) 123 { 124 int *count = (int *)context; 125 126 if (is_dock_device(handle)) { 127 (*count)++; 128 return AE_CTRL_TERMINATE; 129 } else { 130 return AE_OK; 131 } 132 } 133 134 135 136 137 /* 138 * the _DCK method can do funny things... and sometimes not 139 * hah-hah funny. 140 * 141 * TBD - figure out a way to only call fixups for 142 * systems that require them. 143 */ 144 static int post_dock_fixups(struct notifier_block *nb, unsigned long val, 145 void *v) 146 { 147 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); 148 struct pci_bus *bus = func->slot->bridge->pci_bus; 149 u32 buses; 150 151 if (!bus->self) 152 return NOTIFY_OK; 153 154 /* fixup bad _DCK function that rewrites 155 * secondary bridge on slot 156 */ 157 pci_read_config_dword(bus->self, 158 PCI_PRIMARY_BUS, 159 &buses); 160 161 if (((buses >> 8) & 0xff) != bus->secondary) { 162 buses = (buses & 0xff000000) 163 | ((unsigned int)(bus->primary) << 0) 164 | ((unsigned int)(bus->secondary) << 8) 165 | ((unsigned int)(bus->subordinate) << 16); 166 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 167 } 168 return NOTIFY_OK; 169 } 170 171 172 static struct acpi_dock_ops acpiphp_dock_ops = { 173 .handler = handle_hotplug_event_func, 174 }; 175 176 /* callback routine to register each ACPI PCI slot object */ 177 static acpi_status 178 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 179 { 180 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 181 struct acpiphp_slot *slot; 182 struct acpiphp_func *newfunc; 183 acpi_handle tmp; 184 acpi_status status = AE_OK; 185 unsigned long long adr, sun; 186 int device, function, retval; 187 188 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 189 190 if (ACPI_FAILURE(status)) 191 return AE_OK; 192 193 status = acpi_get_handle(handle, "_EJ0", &tmp); 194 195 if (ACPI_FAILURE(status) && !(is_dock_device(handle))) 196 return AE_OK; 197 198 device = (adr >> 16) & 0xffff; 199 function = adr & 0xffff; 200 201 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 202 if (!newfunc) 203 return AE_NO_MEMORY; 204 205 INIT_LIST_HEAD(&newfunc->sibling); 206 newfunc->handle = handle; 207 newfunc->function = function; 208 if (ACPI_SUCCESS(status)) 209 newfunc->flags = FUNC_HAS_EJ0; 210 211 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 212 newfunc->flags |= FUNC_HAS_STA; 213 214 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 215 newfunc->flags |= FUNC_HAS_PS0; 216 217 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 218 newfunc->flags |= FUNC_HAS_PS3; 219 220 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 221 newfunc->flags |= FUNC_HAS_DCK; 222 223 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 224 if (ACPI_FAILURE(status)) { 225 /* 226 * use the count of the number of slots we've found 227 * for the number of the slot 228 */ 229 sun = bridge->nr_slots+1; 230 } 231 232 /* search for objects that share the same slot */ 233 for (slot = bridge->slots; slot; slot = slot->next) 234 if (slot->device == device) { 235 if (slot->sun != sun) 236 warn("sibling found, but _SUN doesn't match!\n"); 237 break; 238 } 239 240 if (!slot) { 241 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 242 if (!slot) { 243 kfree(newfunc); 244 return AE_NO_MEMORY; 245 } 246 247 slot->bridge = bridge; 248 slot->device = device; 249 slot->sun = sun; 250 INIT_LIST_HEAD(&slot->funcs); 251 mutex_init(&slot->crit_sect); 252 253 slot->next = bridge->slots; 254 bridge->slots = slot; 255 256 bridge->nr_slots++; 257 258 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 259 slot->sun, pci_domain_nr(bridge->pci_bus), 260 bridge->pci_bus->number, slot->device); 261 retval = acpiphp_register_hotplug_slot(slot); 262 if (retval) { 263 if (retval == -EBUSY) 264 warn("Slot %llu already registered by another " 265 "hotplug driver\n", slot->sun); 266 else 267 warn("acpiphp_register_hotplug_slot failed " 268 "(err code = 0x%x)\n", retval); 269 goto err_exit; 270 } 271 } 272 273 newfunc->slot = slot; 274 list_add_tail(&newfunc->sibling, &slot->funcs); 275 276 /* associate corresponding pci_dev */ 277 newfunc->pci_dev = pci_get_slot(bridge->pci_bus, 278 PCI_DEVFN(device, function)); 279 if (newfunc->pci_dev) { 280 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 281 } 282 283 if (is_dock_device(handle)) { 284 /* we don't want to call this device's _EJ0 285 * because we want the dock notify handler 286 * to call it after it calls _DCK 287 */ 288 newfunc->flags &= ~FUNC_HAS_EJ0; 289 if (register_hotplug_dock_device(handle, 290 &acpiphp_dock_ops, newfunc)) 291 dbg("failed to register dock device\n"); 292 293 /* we need to be notified when dock events happen 294 * outside of the hotplug operation, since we may 295 * need to do fixups before we can hotplug. 296 */ 297 newfunc->nb.notifier_call = post_dock_fixups; 298 if (register_dock_notifier(&newfunc->nb)) 299 dbg("failed to register a dock notifier"); 300 } 301 302 /* install notify handler */ 303 if (!(newfunc->flags & FUNC_HAS_DCK)) { 304 status = acpi_install_notify_handler(handle, 305 ACPI_SYSTEM_NOTIFY, 306 handle_hotplug_event_func, 307 newfunc); 308 309 if (ACPI_FAILURE(status)) 310 err("failed to register interrupt notify handler\n"); 311 } else 312 status = AE_OK; 313 314 return status; 315 316 err_exit: 317 bridge->nr_slots--; 318 bridge->slots = slot->next; 319 kfree(slot); 320 kfree(newfunc); 321 322 return AE_OK; 323 } 324 325 326 /* see if it's worth looking at this bridge */ 327 static int detect_ejectable_slots(acpi_handle *bridge_handle) 328 { 329 acpi_status status; 330 int count; 331 332 count = 0; 333 334 /* only check slots defined directly below bridge object */ 335 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, 336 is_ejectable_slot, (void *)&count, NULL); 337 338 /* 339 * we also need to add this bridge if there is a dock bridge or 340 * other pci device on a dock station (removable) 341 */ 342 if (!count) 343 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, 344 (u32)1, is_pci_dock_device, (void *)&count, 345 NULL); 346 347 return count; 348 } 349 350 351 /* decode ACPI 2.0 _HPP hot plug parameters */ 352 static void decode_hpp(struct acpiphp_bridge *bridge) 353 { 354 acpi_status status; 355 356 status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp); 357 if (ACPI_FAILURE(status) || 358 !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) { 359 /* use default numbers */ 360 printk(KERN_WARNING 361 "%s: Could not get hotplug parameters. Use defaults\n", 362 __func__); 363 bridge->hpp.t0 = &bridge->hpp.type0_data; 364 bridge->hpp.t0->revision = 0; 365 bridge->hpp.t0->cache_line_size = 0x10; 366 bridge->hpp.t0->latency_timer = 0x40; 367 bridge->hpp.t0->enable_serr = 0; 368 bridge->hpp.t0->enable_perr = 0; 369 } 370 } 371 372 373 374 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 375 static void init_bridge_misc(struct acpiphp_bridge *bridge) 376 { 377 acpi_status status; 378 379 /* decode ACPI 2.0 _HPP (hot plug parameters) */ 380 decode_hpp(bridge); 381 382 /* must be added to the list prior to calling register_slot */ 383 list_add(&bridge->list, &bridge_list); 384 385 /* register all slot objects under this bridge */ 386 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 387 register_slot, bridge, NULL); 388 if (ACPI_FAILURE(status)) { 389 list_del(&bridge->list); 390 return; 391 } 392 393 /* install notify handler */ 394 if (bridge->type != BRIDGE_TYPE_HOST) { 395 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 396 status = acpi_remove_notify_handler(bridge->func->handle, 397 ACPI_SYSTEM_NOTIFY, 398 handle_hotplug_event_func); 399 if (ACPI_FAILURE(status)) 400 err("failed to remove notify handler\n"); 401 } 402 status = acpi_install_notify_handler(bridge->handle, 403 ACPI_SYSTEM_NOTIFY, 404 handle_hotplug_event_bridge, 405 bridge); 406 407 if (ACPI_FAILURE(status)) { 408 err("failed to register interrupt notify handler\n"); 409 } 410 } 411 } 412 413 414 /* find acpiphp_func from acpiphp_bridge */ 415 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 416 { 417 struct list_head *node, *l; 418 struct acpiphp_bridge *bridge; 419 struct acpiphp_slot *slot; 420 struct acpiphp_func *func; 421 422 list_for_each(node, &bridge_list) { 423 bridge = list_entry(node, struct acpiphp_bridge, list); 424 for (slot = bridge->slots; slot; slot = slot->next) { 425 list_for_each(l, &slot->funcs) { 426 func = list_entry(l, struct acpiphp_func, 427 sibling); 428 if (func->handle == handle) 429 return func; 430 } 431 } 432 } 433 434 return NULL; 435 } 436 437 438 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) 439 { 440 acpi_handle dummy_handle; 441 442 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 443 "_STA", &dummy_handle))) 444 bridge->flags |= BRIDGE_HAS_STA; 445 446 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 447 "_EJ0", &dummy_handle))) 448 bridge->flags |= BRIDGE_HAS_EJ0; 449 450 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 451 "_PS0", &dummy_handle))) 452 bridge->flags |= BRIDGE_HAS_PS0; 453 454 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 455 "_PS3", &dummy_handle))) 456 bridge->flags |= BRIDGE_HAS_PS3; 457 458 /* is this ejectable p2p bridge? */ 459 if (bridge->flags & BRIDGE_HAS_EJ0) { 460 struct acpiphp_func *func; 461 462 dbg("found ejectable p2p bridge\n"); 463 464 /* make link between PCI bridge and PCI function */ 465 func = acpiphp_bridge_handle_to_function(bridge->handle); 466 if (!func) 467 return; 468 bridge->func = func; 469 func->bridge = bridge; 470 } 471 } 472 473 474 /* allocate and initialize host bridge data structure */ 475 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus) 476 { 477 struct acpiphp_bridge *bridge; 478 479 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 480 if (bridge == NULL) 481 return; 482 483 bridge->type = BRIDGE_TYPE_HOST; 484 bridge->handle = handle; 485 486 bridge->pci_bus = pci_bus; 487 488 spin_lock_init(&bridge->res_lock); 489 490 init_bridge_misc(bridge); 491 } 492 493 494 /* allocate and initialize PCI-to-PCI bridge data structure */ 495 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev) 496 { 497 struct acpiphp_bridge *bridge; 498 499 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 500 if (bridge == NULL) { 501 err("out of memory\n"); 502 return; 503 } 504 505 bridge->type = BRIDGE_TYPE_P2P; 506 bridge->handle = handle; 507 config_p2p_bridge_flags(bridge); 508 509 bridge->pci_dev = pci_dev_get(pci_dev); 510 bridge->pci_bus = pci_dev->subordinate; 511 if (!bridge->pci_bus) { 512 err("This is not a PCI-to-PCI bridge!\n"); 513 goto err; 514 } 515 516 spin_lock_init(&bridge->res_lock); 517 518 init_bridge_misc(bridge); 519 return; 520 err: 521 pci_dev_put(pci_dev); 522 kfree(bridge); 523 return; 524 } 525 526 527 /* callback routine to find P2P bridges */ 528 static acpi_status 529 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 530 { 531 acpi_status status; 532 acpi_handle dummy_handle; 533 unsigned long long tmp; 534 int device, function; 535 struct pci_dev *dev; 536 struct pci_bus *pci_bus = context; 537 538 status = acpi_get_handle(handle, "_ADR", &dummy_handle); 539 if (ACPI_FAILURE(status)) 540 return AE_OK; /* continue */ 541 542 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); 543 if (ACPI_FAILURE(status)) { 544 dbg("%s: _ADR evaluation failure\n", __func__); 545 return AE_OK; 546 } 547 548 device = (tmp >> 16) & 0xffff; 549 function = tmp & 0xffff; 550 551 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); 552 553 if (!dev || !dev->subordinate) 554 goto out; 555 556 /* check if this bridge has ejectable slots */ 557 if ((detect_ejectable_slots(handle) > 0)) { 558 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 559 add_p2p_bridge(handle, dev); 560 } 561 562 /* search P2P bridges under this p2p bridge */ 563 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 564 find_p2p_bridge, dev->subordinate, NULL); 565 if (ACPI_FAILURE(status)) 566 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 567 568 out: 569 pci_dev_put(dev); 570 return AE_OK; 571 } 572 573 574 /* find hot-pluggable slots, and then find P2P bridge */ 575 static int add_bridge(acpi_handle handle) 576 { 577 acpi_status status; 578 unsigned long long tmp; 579 int seg, bus; 580 acpi_handle dummy_handle; 581 struct pci_bus *pci_bus; 582 583 /* if the bridge doesn't have _STA, we assume it is always there */ 584 status = acpi_get_handle(handle, "_STA", &dummy_handle); 585 if (ACPI_SUCCESS(status)) { 586 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 587 if (ACPI_FAILURE(status)) { 588 dbg("%s: _STA evaluation failure\n", __func__); 589 return 0; 590 } 591 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 592 /* don't register this object */ 593 return 0; 594 } 595 596 /* get PCI segment number */ 597 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); 598 599 seg = ACPI_SUCCESS(status) ? tmp : 0; 600 601 /* get PCI bus number */ 602 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); 603 604 if (ACPI_SUCCESS(status)) { 605 bus = tmp; 606 } else { 607 warn("can't get bus number, assuming 0\n"); 608 bus = 0; 609 } 610 611 pci_bus = pci_find_bus(seg, bus); 612 if (!pci_bus) { 613 err("Can't find bus %04x:%02x\n", seg, bus); 614 return 0; 615 } 616 617 /* check if this bridge has ejectable slots */ 618 if (detect_ejectable_slots(handle) > 0) { 619 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 620 add_host_bridge(handle, pci_bus); 621 } 622 623 /* search P2P bridges under this host bridge */ 624 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 625 find_p2p_bridge, pci_bus, NULL); 626 627 if (ACPI_FAILURE(status)) 628 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 629 630 return 0; 631 } 632 633 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 634 { 635 struct list_head *head; 636 list_for_each(head, &bridge_list) { 637 struct acpiphp_bridge *bridge = list_entry(head, 638 struct acpiphp_bridge, list); 639 if (bridge->handle == handle) 640 return bridge; 641 } 642 643 return NULL; 644 } 645 646 static void cleanup_bridge(struct acpiphp_bridge *bridge) 647 { 648 struct list_head *list, *tmp; 649 struct acpiphp_slot *slot; 650 acpi_status status; 651 acpi_handle handle = bridge->handle; 652 653 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 654 handle_hotplug_event_bridge); 655 if (ACPI_FAILURE(status)) 656 err("failed to remove notify handler\n"); 657 658 if ((bridge->type != BRIDGE_TYPE_HOST) && 659 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 660 status = acpi_install_notify_handler(bridge->func->handle, 661 ACPI_SYSTEM_NOTIFY, 662 handle_hotplug_event_func, 663 bridge->func); 664 if (ACPI_FAILURE(status)) 665 err("failed to install interrupt notify handler\n"); 666 } 667 668 slot = bridge->slots; 669 while (slot) { 670 struct acpiphp_slot *next = slot->next; 671 list_for_each_safe (list, tmp, &slot->funcs) { 672 struct acpiphp_func *func; 673 func = list_entry(list, struct acpiphp_func, sibling); 674 if (is_dock_device(func->handle)) { 675 unregister_hotplug_dock_device(func->handle); 676 unregister_dock_notifier(&func->nb); 677 } 678 if (!(func->flags & FUNC_HAS_DCK)) { 679 status = acpi_remove_notify_handler(func->handle, 680 ACPI_SYSTEM_NOTIFY, 681 handle_hotplug_event_func); 682 if (ACPI_FAILURE(status)) 683 err("failed to remove notify handler\n"); 684 } 685 pci_dev_put(func->pci_dev); 686 list_del(list); 687 kfree(func); 688 } 689 acpiphp_unregister_hotplug_slot(slot); 690 list_del(&slot->funcs); 691 kfree(slot); 692 slot = next; 693 } 694 695 pci_dev_put(bridge->pci_dev); 696 list_del(&bridge->list); 697 kfree(bridge); 698 } 699 700 static acpi_status 701 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 702 { 703 struct acpiphp_bridge *bridge; 704 705 /* cleanup p2p bridges under this P2P bridge 706 in a depth-first manner */ 707 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 708 cleanup_p2p_bridge, NULL, NULL); 709 710 bridge = acpiphp_handle_to_bridge(handle); 711 if (bridge) 712 cleanup_bridge(bridge); 713 714 return AE_OK; 715 } 716 717 static void remove_bridge(acpi_handle handle) 718 { 719 struct acpiphp_bridge *bridge; 720 721 /* cleanup p2p bridges under this host bridge 722 in a depth-first manner */ 723 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 724 (u32)1, cleanup_p2p_bridge, NULL, NULL); 725 726 /* 727 * On root bridges with hotplug slots directly underneath (ie, 728 * no p2p bridge inbetween), we call cleanup_bridge(). 729 * 730 * The else clause cleans up root bridges that either had no 731 * hotplug slots at all, or had a p2p bridge underneath. 732 */ 733 bridge = acpiphp_handle_to_bridge(handle); 734 if (bridge) 735 cleanup_bridge(bridge); 736 else 737 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 738 handle_hotplug_event_bridge); 739 } 740 741 static struct pci_dev * get_apic_pci_info(acpi_handle handle) 742 { 743 struct acpi_pci_id id; 744 struct pci_bus *bus; 745 struct pci_dev *dev; 746 747 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) 748 return NULL; 749 750 bus = pci_find_bus(id.segment, id.bus); 751 if (!bus) 752 return NULL; 753 754 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); 755 if (!dev) 756 return NULL; 757 758 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && 759 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) 760 { 761 pci_dev_put(dev); 762 return NULL; 763 } 764 765 return dev; 766 } 767 768 static int get_gsi_base(acpi_handle handle, u32 *gsi_base) 769 { 770 acpi_status status; 771 int result = -1; 772 unsigned long long gsb; 773 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 774 union acpi_object *obj; 775 void *table; 776 777 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); 778 if (ACPI_SUCCESS(status)) { 779 *gsi_base = (u32)gsb; 780 return 0; 781 } 782 783 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); 784 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) 785 return -1; 786 787 obj = buffer.pointer; 788 if (obj->type != ACPI_TYPE_BUFFER) 789 goto out; 790 791 table = obj->buffer.pointer; 792 switch (((struct acpi_subtable_header *)table)->type) { 793 case ACPI_MADT_TYPE_IO_SAPIC: 794 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base; 795 result = 0; 796 break; 797 case ACPI_MADT_TYPE_IO_APIC: 798 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base; 799 result = 0; 800 break; 801 default: 802 break; 803 } 804 out: 805 kfree(buffer.pointer); 806 return result; 807 } 808 809 static acpi_status 810 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) 811 { 812 acpi_status status; 813 unsigned long long sta; 814 acpi_handle tmp; 815 struct pci_dev *pdev; 816 u32 gsi_base; 817 u64 phys_addr; 818 struct acpiphp_ioapic *ioapic; 819 820 /* Evaluate _STA if present */ 821 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 822 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 823 return AE_CTRL_DEPTH; 824 825 /* Scan only PCI bus scope */ 826 status = acpi_get_handle(handle, "_HID", &tmp); 827 if (ACPI_SUCCESS(status)) 828 return AE_CTRL_DEPTH; 829 830 if (get_gsi_base(handle, &gsi_base)) 831 return AE_OK; 832 833 ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL); 834 if (!ioapic) 835 return AE_NO_MEMORY; 836 837 pdev = get_apic_pci_info(handle); 838 if (!pdev) 839 goto exit_kfree; 840 841 if (pci_enable_device(pdev)) 842 goto exit_pci_dev_put; 843 844 pci_set_master(pdev); 845 846 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) 847 goto exit_pci_disable_device; 848 849 phys_addr = pci_resource_start(pdev, 0); 850 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) 851 goto exit_pci_release_region; 852 853 ioapic->gsi_base = gsi_base; 854 ioapic->dev = pdev; 855 spin_lock(&ioapic_list_lock); 856 list_add_tail(&ioapic->list, &ioapic_list); 857 spin_unlock(&ioapic_list_lock); 858 859 return AE_OK; 860 861 exit_pci_release_region: 862 pci_release_region(pdev, 0); 863 exit_pci_disable_device: 864 pci_disable_device(pdev); 865 exit_pci_dev_put: 866 pci_dev_put(pdev); 867 exit_kfree: 868 kfree(ioapic); 869 870 return AE_OK; 871 } 872 873 static acpi_status 874 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv) 875 { 876 acpi_status status; 877 unsigned long long sta; 878 acpi_handle tmp; 879 u32 gsi_base; 880 struct acpiphp_ioapic *pos, *n, *ioapic = NULL; 881 882 /* Evaluate _STA if present */ 883 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 884 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 885 return AE_CTRL_DEPTH; 886 887 /* Scan only PCI bus scope */ 888 status = acpi_get_handle(handle, "_HID", &tmp); 889 if (ACPI_SUCCESS(status)) 890 return AE_CTRL_DEPTH; 891 892 if (get_gsi_base(handle, &gsi_base)) 893 return AE_OK; 894 895 acpi_unregister_ioapic(handle, gsi_base); 896 897 spin_lock(&ioapic_list_lock); 898 list_for_each_entry_safe(pos, n, &ioapic_list, list) { 899 if (pos->gsi_base != gsi_base) 900 continue; 901 ioapic = pos; 902 list_del(&ioapic->list); 903 break; 904 } 905 spin_unlock(&ioapic_list_lock); 906 907 if (!ioapic) 908 return AE_OK; 909 910 pci_release_region(ioapic->dev, 0); 911 pci_disable_device(ioapic->dev); 912 pci_dev_put(ioapic->dev); 913 kfree(ioapic); 914 915 return AE_OK; 916 } 917 918 static int acpiphp_configure_ioapics(acpi_handle handle) 919 { 920 ioapic_add(handle, 0, NULL, NULL); 921 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 922 ACPI_UINT32_MAX, ioapic_add, NULL, NULL); 923 return 0; 924 } 925 926 static int acpiphp_unconfigure_ioapics(acpi_handle handle) 927 { 928 ioapic_remove(handle, 0, NULL, NULL); 929 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 930 ACPI_UINT32_MAX, ioapic_remove, NULL, NULL); 931 return 0; 932 } 933 934 static int power_on_slot(struct acpiphp_slot *slot) 935 { 936 acpi_status status; 937 struct acpiphp_func *func; 938 struct list_head *l; 939 int retval = 0; 940 941 /* if already enabled, just skip */ 942 if (slot->flags & SLOT_POWEREDON) 943 goto err_exit; 944 945 list_for_each (l, &slot->funcs) { 946 func = list_entry(l, struct acpiphp_func, sibling); 947 948 if (func->flags & FUNC_HAS_PS0) { 949 dbg("%s: executing _PS0\n", __func__); 950 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 951 if (ACPI_FAILURE(status)) { 952 warn("%s: _PS0 failed\n", __func__); 953 retval = -1; 954 goto err_exit; 955 } else 956 break; 957 } 958 } 959 960 /* TBD: evaluate _STA to check if the slot is enabled */ 961 962 slot->flags |= SLOT_POWEREDON; 963 964 err_exit: 965 return retval; 966 } 967 968 969 static int power_off_slot(struct acpiphp_slot *slot) 970 { 971 acpi_status status; 972 struct acpiphp_func *func; 973 struct list_head *l; 974 975 int retval = 0; 976 977 /* if already disabled, just skip */ 978 if ((slot->flags & SLOT_POWEREDON) == 0) 979 goto err_exit; 980 981 list_for_each (l, &slot->funcs) { 982 func = list_entry(l, struct acpiphp_func, sibling); 983 984 if (func->flags & FUNC_HAS_PS3) { 985 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 986 if (ACPI_FAILURE(status)) { 987 warn("%s: _PS3 failed\n", __func__); 988 retval = -1; 989 goto err_exit; 990 } else 991 break; 992 } 993 } 994 995 /* TBD: evaluate _STA to check if the slot is disabled */ 996 997 slot->flags &= (~SLOT_POWEREDON); 998 999 err_exit: 1000 return retval; 1001 } 1002 1003 1004 1005 /** 1006 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 1007 * @bus: bus to start search with 1008 */ 1009 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 1010 { 1011 struct list_head *tmp; 1012 unsigned char max, n; 1013 1014 /* 1015 * pci_bus_max_busnr will return the highest 1016 * reserved busnr for all these children. 1017 * that is equivalent to the bus->subordinate 1018 * value. We don't want to use the parent's 1019 * bus->subordinate value because it could have 1020 * padding in it. 1021 */ 1022 max = bus->secondary; 1023 1024 list_for_each(tmp, &bus->children) { 1025 n = pci_bus_max_busnr(pci_bus_b(tmp)); 1026 if (n > max) 1027 max = n; 1028 } 1029 return max; 1030 } 1031 1032 1033 /** 1034 * acpiphp_bus_add - add a new bus to acpi subsystem 1035 * @func: acpiphp_func of the bridge 1036 */ 1037 static int acpiphp_bus_add(struct acpiphp_func *func) 1038 { 1039 acpi_handle phandle; 1040 struct acpi_device *device, *pdevice; 1041 int ret_val; 1042 1043 acpi_get_parent(func->handle, &phandle); 1044 if (acpi_bus_get_device(phandle, &pdevice)) { 1045 dbg("no parent device, assuming NULL\n"); 1046 pdevice = NULL; 1047 } 1048 if (!acpi_bus_get_device(func->handle, &device)) { 1049 dbg("bus exists... trim\n"); 1050 /* this shouldn't be in here, so remove 1051 * the bus then re-add it... 1052 */ 1053 ret_val = acpi_bus_trim(device, 1); 1054 dbg("acpi_bus_trim return %x\n", ret_val); 1055 } 1056 1057 ret_val = acpi_bus_add(&device, pdevice, func->handle, 1058 ACPI_BUS_TYPE_DEVICE); 1059 if (ret_val) { 1060 dbg("error adding bus, %x\n", 1061 -ret_val); 1062 goto acpiphp_bus_add_out; 1063 } 1064 /* 1065 * try to start anyway. We could have failed to add 1066 * simply because this bus had previously been added 1067 * on another add. Don't bother with the return value 1068 * we just keep going. 1069 */ 1070 ret_val = acpi_bus_start(device); 1071 1072 acpiphp_bus_add_out: 1073 return ret_val; 1074 } 1075 1076 1077 /** 1078 * acpiphp_bus_trim - trim a bus from acpi subsystem 1079 * @handle: handle to acpi namespace 1080 */ 1081 static int acpiphp_bus_trim(acpi_handle handle) 1082 { 1083 struct acpi_device *device; 1084 int retval; 1085 1086 retval = acpi_bus_get_device(handle, &device); 1087 if (retval) { 1088 dbg("acpi_device not found\n"); 1089 return retval; 1090 } 1091 1092 retval = acpi_bus_trim(device, 1); 1093 if (retval) 1094 err("cannot remove from acpi list\n"); 1095 1096 return retval; 1097 } 1098 1099 /** 1100 * enable_device - enable, configure a slot 1101 * @slot: slot to be enabled 1102 * 1103 * This function should be called per *physical slot*, 1104 * not per each slot object in ACPI namespace. 1105 */ 1106 static int __ref enable_device(struct acpiphp_slot *slot) 1107 { 1108 struct pci_dev *dev; 1109 struct pci_bus *bus = slot->bridge->pci_bus; 1110 struct list_head *l; 1111 struct acpiphp_func *func; 1112 int retval = 0; 1113 int num, max, pass; 1114 acpi_status status; 1115 1116 if (slot->flags & SLOT_ENABLED) 1117 goto err_exit; 1118 1119 /* sanity check: dev should be NULL when hot-plugged in */ 1120 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 1121 if (dev) { 1122 /* This case shouldn't happen */ 1123 err("pci_dev structure already exists.\n"); 1124 pci_dev_put(dev); 1125 retval = -1; 1126 goto err_exit; 1127 } 1128 1129 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 1130 if (num == 0) { 1131 err("No new device found\n"); 1132 retval = -1; 1133 goto err_exit; 1134 } 1135 1136 max = acpiphp_max_busnr(bus); 1137 for (pass = 0; pass < 2; pass++) { 1138 list_for_each_entry(dev, &bus->devices, bus_list) { 1139 if (PCI_SLOT(dev->devfn) != slot->device) 1140 continue; 1141 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 1142 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 1143 max = pci_scan_bridge(bus, dev, max, pass); 1144 if (pass && dev->subordinate) 1145 pci_bus_size_bridges(dev->subordinate); 1146 } 1147 } 1148 } 1149 1150 list_for_each (l, &slot->funcs) { 1151 func = list_entry(l, struct acpiphp_func, sibling); 1152 acpiphp_bus_add(func); 1153 } 1154 1155 pci_bus_assign_resources(bus); 1156 acpiphp_sanitize_bus(bus); 1157 acpiphp_set_hpp_values(slot->bridge->handle, bus); 1158 list_for_each_entry(func, &slot->funcs, sibling) 1159 acpiphp_configure_ioapics(func->handle); 1160 pci_enable_bridges(bus); 1161 pci_bus_add_devices(bus); 1162 1163 /* associate pci_dev to our representation */ 1164 list_for_each (l, &slot->funcs) { 1165 func = list_entry(l, struct acpiphp_func, sibling); 1166 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 1167 func->function)); 1168 if (!func->pci_dev) 1169 continue; 1170 1171 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 1172 func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) 1173 continue; 1174 1175 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 1176 if (ACPI_FAILURE(status)) 1177 warn("find_p2p_bridge failed (error code = 0x%x)\n", 1178 status); 1179 } 1180 1181 slot->flags |= SLOT_ENABLED; 1182 1183 err_exit: 1184 return retval; 1185 } 1186 1187 static void disable_bridges(struct pci_bus *bus) 1188 { 1189 struct pci_dev *dev; 1190 list_for_each_entry(dev, &bus->devices, bus_list) { 1191 if (dev->subordinate) { 1192 disable_bridges(dev->subordinate); 1193 pci_disable_device(dev); 1194 } 1195 } 1196 } 1197 1198 /** 1199 * disable_device - disable a slot 1200 * @slot: ACPI PHP slot 1201 */ 1202 static int disable_device(struct acpiphp_slot *slot) 1203 { 1204 int retval = 0; 1205 struct acpiphp_func *func; 1206 struct list_head *l; 1207 1208 /* is this slot already disabled? */ 1209 if (!(slot->flags & SLOT_ENABLED)) 1210 goto err_exit; 1211 1212 list_for_each (l, &slot->funcs) { 1213 func = list_entry(l, struct acpiphp_func, sibling); 1214 1215 if (func->bridge) { 1216 /* cleanup p2p bridges under this P2P bridge */ 1217 cleanup_p2p_bridge(func->bridge->handle, 1218 (u32)1, NULL, NULL); 1219 func->bridge = NULL; 1220 } 1221 1222 if (func->pci_dev) { 1223 pci_stop_bus_device(func->pci_dev); 1224 if (func->pci_dev->subordinate) { 1225 disable_bridges(func->pci_dev->subordinate); 1226 pci_disable_device(func->pci_dev); 1227 } 1228 } 1229 } 1230 1231 list_for_each (l, &slot->funcs) { 1232 func = list_entry(l, struct acpiphp_func, sibling); 1233 1234 acpiphp_unconfigure_ioapics(func->handle); 1235 acpiphp_bus_trim(func->handle); 1236 /* try to remove anyway. 1237 * acpiphp_bus_add might have been failed */ 1238 1239 if (!func->pci_dev) 1240 continue; 1241 1242 pci_remove_bus_device(func->pci_dev); 1243 pci_dev_put(func->pci_dev); 1244 func->pci_dev = NULL; 1245 } 1246 1247 slot->flags &= (~SLOT_ENABLED); 1248 1249 err_exit: 1250 return retval; 1251 } 1252 1253 1254 /** 1255 * get_slot_status - get ACPI slot status 1256 * @slot: ACPI PHP slot 1257 * 1258 * If a slot has _STA for each function and if any one of them 1259 * returned non-zero status, return it. 1260 * 1261 * If a slot doesn't have _STA and if any one of its functions' 1262 * configuration space is configured, return 0x0f as a _STA. 1263 * 1264 * Otherwise return 0. 1265 */ 1266 static unsigned int get_slot_status(struct acpiphp_slot *slot) 1267 { 1268 acpi_status status; 1269 unsigned long long sta = 0; 1270 u32 dvid; 1271 struct list_head *l; 1272 struct acpiphp_func *func; 1273 1274 list_for_each (l, &slot->funcs) { 1275 func = list_entry(l, struct acpiphp_func, sibling); 1276 1277 if (func->flags & FUNC_HAS_STA) { 1278 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 1279 if (ACPI_SUCCESS(status) && sta) 1280 break; 1281 } else { 1282 pci_bus_read_config_dword(slot->bridge->pci_bus, 1283 PCI_DEVFN(slot->device, 1284 func->function), 1285 PCI_VENDOR_ID, &dvid); 1286 if (dvid != 0xffffffff) { 1287 sta = ACPI_STA_ALL; 1288 break; 1289 } 1290 } 1291 } 1292 1293 return (unsigned int)sta; 1294 } 1295 1296 /** 1297 * acpiphp_eject_slot - physically eject the slot 1298 * @slot: ACPI PHP slot 1299 */ 1300 int acpiphp_eject_slot(struct acpiphp_slot *slot) 1301 { 1302 acpi_status status; 1303 struct acpiphp_func *func; 1304 struct list_head *l; 1305 struct acpi_object_list arg_list; 1306 union acpi_object arg; 1307 1308 list_for_each (l, &slot->funcs) { 1309 func = list_entry(l, struct acpiphp_func, sibling); 1310 1311 /* We don't want to call _EJ0 on non-existing functions. */ 1312 if ((func->flags & FUNC_HAS_EJ0)) { 1313 /* _EJ0 method take one argument */ 1314 arg_list.count = 1; 1315 arg_list.pointer = &arg; 1316 arg.type = ACPI_TYPE_INTEGER; 1317 arg.integer.value = 1; 1318 1319 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1320 if (ACPI_FAILURE(status)) { 1321 warn("%s: _EJ0 failed\n", __func__); 1322 return -1; 1323 } else 1324 break; 1325 } 1326 } 1327 return 0; 1328 } 1329 1330 /** 1331 * acpiphp_check_bridge - re-enumerate devices 1332 * @bridge: where to begin re-enumeration 1333 * 1334 * Iterate over all slots under this bridge and make sure that if a 1335 * card is present they are enabled, and if not they are disabled. 1336 */ 1337 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1338 { 1339 struct acpiphp_slot *slot; 1340 int retval = 0; 1341 int enabled, disabled; 1342 1343 enabled = disabled = 0; 1344 1345 for (slot = bridge->slots; slot; slot = slot->next) { 1346 unsigned int status = get_slot_status(slot); 1347 if (slot->flags & SLOT_ENABLED) { 1348 if (status == ACPI_STA_ALL) 1349 continue; 1350 retval = acpiphp_disable_slot(slot); 1351 if (retval) { 1352 err("Error occurred in disabling\n"); 1353 goto err_exit; 1354 } else { 1355 acpiphp_eject_slot(slot); 1356 } 1357 disabled++; 1358 } else { 1359 if (status != ACPI_STA_ALL) 1360 continue; 1361 retval = acpiphp_enable_slot(slot); 1362 if (retval) { 1363 err("Error occurred in enabling\n"); 1364 goto err_exit; 1365 } 1366 enabled++; 1367 } 1368 } 1369 1370 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 1371 1372 err_exit: 1373 return retval; 1374 } 1375 1376 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) 1377 { 1378 u16 pci_cmd, pci_bctl; 1379 struct pci_dev *cdev; 1380 1381 /* Program hpp values for this device */ 1382 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 1383 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 1384 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 1385 return; 1386 1387 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) 1388 return; 1389 1390 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 1391 bridge->hpp.t0->cache_line_size); 1392 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 1393 bridge->hpp.t0->latency_timer); 1394 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 1395 if (bridge->hpp.t0->enable_serr) 1396 pci_cmd |= PCI_COMMAND_SERR; 1397 else 1398 pci_cmd &= ~PCI_COMMAND_SERR; 1399 if (bridge->hpp.t0->enable_perr) 1400 pci_cmd |= PCI_COMMAND_PARITY; 1401 else 1402 pci_cmd &= ~PCI_COMMAND_PARITY; 1403 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 1404 1405 /* Program bridge control value and child devices */ 1406 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 1407 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 1408 bridge->hpp.t0->latency_timer); 1409 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 1410 if (bridge->hpp.t0->enable_serr) 1411 pci_bctl |= PCI_BRIDGE_CTL_SERR; 1412 else 1413 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 1414 if (bridge->hpp.t0->enable_perr) 1415 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 1416 else 1417 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 1418 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 1419 if (dev->subordinate) { 1420 list_for_each_entry(cdev, &dev->subordinate->devices, 1421 bus_list) 1422 program_hpp(cdev, bridge); 1423 } 1424 } 1425 } 1426 1427 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) 1428 { 1429 struct acpiphp_bridge bridge; 1430 struct pci_dev *dev; 1431 1432 memset(&bridge, 0, sizeof(bridge)); 1433 bridge.handle = handle; 1434 bridge.pci_bus = bus; 1435 bridge.pci_dev = bus->self; 1436 decode_hpp(&bridge); 1437 list_for_each_entry(dev, &bus->devices, bus_list) 1438 program_hpp(dev, &bridge); 1439 1440 } 1441 1442 /* 1443 * Remove devices for which we could not assign resources, call 1444 * arch specific code to fix-up the bus 1445 */ 1446 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1447 { 1448 struct pci_dev *dev; 1449 int i; 1450 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1451 1452 list_for_each_entry(dev, &bus->devices, bus_list) { 1453 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1454 struct resource *res = &dev->resource[i]; 1455 if ((res->flags & type_mask) && !res->start && 1456 res->end) { 1457 /* Could not assign a required resources 1458 * for this device, remove it */ 1459 pci_remove_bus_device(dev); 1460 break; 1461 } 1462 } 1463 } 1464 } 1465 1466 /* Program resources in newly inserted bridge */ 1467 static int acpiphp_configure_bridge (acpi_handle handle) 1468 { 1469 struct acpi_pci_id pci_id; 1470 struct pci_bus *bus; 1471 1472 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { 1473 err("cannot get PCI domain and bus number for bridge\n"); 1474 return -EINVAL; 1475 } 1476 bus = pci_find_bus(pci_id.segment, pci_id.bus); 1477 if (!bus) { 1478 err("cannot find bus %d:%d\n", 1479 pci_id.segment, pci_id.bus); 1480 return -EINVAL; 1481 } 1482 1483 pci_bus_size_bridges(bus); 1484 pci_bus_assign_resources(bus); 1485 acpiphp_sanitize_bus(bus); 1486 acpiphp_set_hpp_values(handle, bus); 1487 pci_enable_bridges(bus); 1488 acpiphp_configure_ioapics(handle); 1489 return 0; 1490 } 1491 1492 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1493 { 1494 struct acpi_device *device, *pdevice; 1495 acpi_handle phandle; 1496 1497 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1498 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1499 err("unexpected notification type %d\n", type); 1500 return; 1501 } 1502 1503 acpi_get_parent(handle, &phandle); 1504 if (acpi_bus_get_device(phandle, &pdevice)) { 1505 dbg("no parent device, assuming NULL\n"); 1506 pdevice = NULL; 1507 } 1508 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1509 err("cannot add bridge to acpi list\n"); 1510 return; 1511 } 1512 if (!acpiphp_configure_bridge(handle) && 1513 !acpi_bus_start(device)) 1514 add_bridge(handle); 1515 else 1516 err("cannot configure and start bridge\n"); 1517 1518 } 1519 1520 /* 1521 * ACPI event handlers 1522 */ 1523 1524 static acpi_status 1525 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1526 { 1527 int *count = (int *)context; 1528 struct acpiphp_bridge *bridge; 1529 1530 bridge = acpiphp_handle_to_bridge(handle); 1531 if (bridge) 1532 (*count)++; 1533 return AE_OK ; 1534 } 1535 1536 static acpi_status 1537 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1538 { 1539 struct acpiphp_bridge *bridge; 1540 char objname[64]; 1541 struct acpi_buffer buffer = { .length = sizeof(objname), 1542 .pointer = objname }; 1543 1544 bridge = acpiphp_handle_to_bridge(handle); 1545 if (bridge) { 1546 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1547 dbg("%s: re-enumerating slots under %s\n", 1548 __func__, objname); 1549 acpiphp_check_bridge(bridge); 1550 } 1551 return AE_OK ; 1552 } 1553 1554 /** 1555 * handle_hotplug_event_bridge - handle ACPI event on bridges 1556 * @handle: Notify()'ed acpi_handle 1557 * @type: Notify code 1558 * @context: pointer to acpiphp_bridge structure 1559 * 1560 * Handles ACPI event notification on {host,p2p} bridges. 1561 */ 1562 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) 1563 { 1564 struct acpiphp_bridge *bridge; 1565 char objname[64]; 1566 struct acpi_buffer buffer = { .length = sizeof(objname), 1567 .pointer = objname }; 1568 struct acpi_device *device; 1569 int num_sub_bridges = 0; 1570 1571 if (acpi_bus_get_device(handle, &device)) { 1572 /* This bridge must have just been physically inserted */ 1573 handle_bridge_insertion(handle, type); 1574 return; 1575 } 1576 1577 bridge = acpiphp_handle_to_bridge(handle); 1578 if (type == ACPI_NOTIFY_BUS_CHECK) { 1579 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1580 count_sub_bridges, &num_sub_bridges, NULL); 1581 } 1582 1583 if (!bridge && !num_sub_bridges) { 1584 err("cannot get bridge info\n"); 1585 return; 1586 } 1587 1588 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1589 1590 switch (type) { 1591 case ACPI_NOTIFY_BUS_CHECK: 1592 /* bus re-enumerate */ 1593 dbg("%s: Bus check notify on %s\n", __func__, objname); 1594 if (bridge) { 1595 dbg("%s: re-enumerating slots under %s\n", 1596 __func__, objname); 1597 acpiphp_check_bridge(bridge); 1598 } 1599 if (num_sub_bridges) 1600 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1601 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL); 1602 break; 1603 1604 case ACPI_NOTIFY_DEVICE_CHECK: 1605 /* device check */ 1606 dbg("%s: Device check notify on %s\n", __func__, objname); 1607 acpiphp_check_bridge(bridge); 1608 break; 1609 1610 case ACPI_NOTIFY_DEVICE_WAKE: 1611 /* wake event */ 1612 dbg("%s: Device wake notify on %s\n", __func__, objname); 1613 break; 1614 1615 case ACPI_NOTIFY_EJECT_REQUEST: 1616 /* request device eject */ 1617 dbg("%s: Device eject notify on %s\n", __func__, objname); 1618 if ((bridge->type != BRIDGE_TYPE_HOST) && 1619 (bridge->flags & BRIDGE_HAS_EJ0)) { 1620 struct acpiphp_slot *slot; 1621 slot = bridge->func->slot; 1622 if (!acpiphp_disable_slot(slot)) 1623 acpiphp_eject_slot(slot); 1624 } 1625 break; 1626 1627 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1628 printk(KERN_ERR "Device %s cannot be configured due" 1629 " to a frequency mismatch\n", objname); 1630 break; 1631 1632 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1633 printk(KERN_ERR "Device %s cannot be configured due" 1634 " to a bus mode mismatch\n", objname); 1635 break; 1636 1637 case ACPI_NOTIFY_POWER_FAULT: 1638 printk(KERN_ERR "Device %s has suffered a power fault\n", 1639 objname); 1640 break; 1641 1642 default: 1643 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1644 break; 1645 } 1646 } 1647 1648 /** 1649 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1650 * @handle: Notify()'ed acpi_handle 1651 * @type: Notify code 1652 * @context: pointer to acpiphp_func structure 1653 * 1654 * Handles ACPI event notification on slots. 1655 */ 1656 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) 1657 { 1658 struct acpiphp_func *func; 1659 char objname[64]; 1660 struct acpi_buffer buffer = { .length = sizeof(objname), 1661 .pointer = objname }; 1662 1663 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1664 1665 func = (struct acpiphp_func *)context; 1666 1667 switch (type) { 1668 case ACPI_NOTIFY_BUS_CHECK: 1669 /* bus re-enumerate */ 1670 dbg("%s: Bus check notify on %s\n", __func__, objname); 1671 acpiphp_enable_slot(func->slot); 1672 break; 1673 1674 case ACPI_NOTIFY_DEVICE_CHECK: 1675 /* device check : re-enumerate from parent bus */ 1676 dbg("%s: Device check notify on %s\n", __func__, objname); 1677 acpiphp_check_bridge(func->slot->bridge); 1678 break; 1679 1680 case ACPI_NOTIFY_DEVICE_WAKE: 1681 /* wake event */ 1682 dbg("%s: Device wake notify on %s\n", __func__, objname); 1683 break; 1684 1685 case ACPI_NOTIFY_EJECT_REQUEST: 1686 /* request device eject */ 1687 dbg("%s: Device eject notify on %s\n", __func__, objname); 1688 if (!(acpiphp_disable_slot(func->slot))) 1689 acpiphp_eject_slot(func->slot); 1690 break; 1691 1692 default: 1693 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1694 break; 1695 } 1696 } 1697 1698 1699 static acpi_status 1700 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1701 { 1702 int *count = (int *)context; 1703 1704 if (acpi_root_bridge(handle)) { 1705 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1706 handle_hotplug_event_bridge, NULL); 1707 (*count)++; 1708 } 1709 return AE_OK ; 1710 } 1711 1712 static struct acpi_pci_driver acpi_pci_hp_driver = { 1713 .add = add_bridge, 1714 .remove = remove_bridge, 1715 }; 1716 1717 /** 1718 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1719 */ 1720 int __init acpiphp_glue_init(void) 1721 { 1722 int num = 0; 1723 1724 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1725 ACPI_UINT32_MAX, find_root_bridges, &num, NULL); 1726 1727 if (num <= 0) 1728 return -1; 1729 else 1730 acpi_pci_register_driver(&acpi_pci_hp_driver); 1731 1732 return 0; 1733 } 1734 1735 1736 /** 1737 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1738 * 1739 * This function frees all data allocated in acpiphp_glue_init(). 1740 */ 1741 void acpiphp_glue_exit(void) 1742 { 1743 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1744 } 1745 1746 1747 /** 1748 * acpiphp_get_num_slots - count number of slots in a system 1749 */ 1750 int __init acpiphp_get_num_slots(void) 1751 { 1752 struct acpiphp_bridge *bridge; 1753 int num_slots = 0; 1754 1755 list_for_each_entry (bridge, &bridge_list, list) { 1756 dbg("Bus %04x:%02x has %d slot%s\n", 1757 pci_domain_nr(bridge->pci_bus), 1758 bridge->pci_bus->number, bridge->nr_slots, 1759 bridge->nr_slots == 1 ? "" : "s"); 1760 num_slots += bridge->nr_slots; 1761 } 1762 1763 dbg("Total %d slots\n", num_slots); 1764 return num_slots; 1765 } 1766 1767 1768 #if 0 1769 /** 1770 * acpiphp_for_each_slot - call function for each slot 1771 * @fn: callback function 1772 * @data: context to be passed to callback function 1773 */ 1774 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1775 { 1776 struct list_head *node; 1777 struct acpiphp_bridge *bridge; 1778 struct acpiphp_slot *slot; 1779 int retval = 0; 1780 1781 list_for_each (node, &bridge_list) { 1782 bridge = (struct acpiphp_bridge *)node; 1783 for (slot = bridge->slots; slot; slot = slot->next) { 1784 retval = fn(slot, data); 1785 if (!retval) 1786 goto err_exit; 1787 } 1788 } 1789 1790 err_exit: 1791 return retval; 1792 } 1793 #endif 1794 1795 1796 /** 1797 * acpiphp_enable_slot - power on slot 1798 * @slot: ACPI PHP slot 1799 */ 1800 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1801 { 1802 int retval; 1803 1804 mutex_lock(&slot->crit_sect); 1805 1806 /* wake up all functions */ 1807 retval = power_on_slot(slot); 1808 if (retval) 1809 goto err_exit; 1810 1811 if (get_slot_status(slot) == ACPI_STA_ALL) { 1812 /* configure all functions */ 1813 retval = enable_device(slot); 1814 if (retval) 1815 power_off_slot(slot); 1816 } else { 1817 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1818 power_off_slot(slot); 1819 } 1820 1821 err_exit: 1822 mutex_unlock(&slot->crit_sect); 1823 return retval; 1824 } 1825 1826 /** 1827 * acpiphp_disable_slot - power off slot 1828 * @slot: ACPI PHP slot 1829 */ 1830 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1831 { 1832 int retval = 0; 1833 1834 mutex_lock(&slot->crit_sect); 1835 1836 /* unconfigure all functions */ 1837 retval = disable_device(slot); 1838 if (retval) 1839 goto err_exit; 1840 1841 /* power off all functions */ 1842 retval = power_off_slot(slot); 1843 if (retval) 1844 goto err_exit; 1845 1846 err_exit: 1847 mutex_unlock(&slot->crit_sect); 1848 return retval; 1849 } 1850 1851 1852 /* 1853 * slot enabled: 1 1854 * slot disabled: 0 1855 */ 1856 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1857 { 1858 return (slot->flags & SLOT_POWEREDON); 1859 } 1860 1861 1862 /* 1863 * latch open: 1 1864 * latch closed: 0 1865 */ 1866 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1867 { 1868 unsigned int sta; 1869 1870 sta = get_slot_status(slot); 1871 1872 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1873 } 1874 1875 1876 /* 1877 * adapter presence : 1 1878 * absence : 0 1879 */ 1880 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1881 { 1882 unsigned int sta; 1883 1884 sta = get_slot_status(slot); 1885 1886 return (sta == 0) ? 0 : 1; 1887 } 1888