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