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_bridge has its refcount elevated by pci_get_slot() 36 * when the bridge is scanned and it loses a refcount when the bridge 37 * is removed. 38 * - When a P2P bridge is present, we elevate the refcount on the subordinate 39 * bus. It loses the refcount when the the driver unloads. 40 */ 41 42 #include <linux/init.h> 43 #include <linux/module.h> 44 45 #include <linux/kernel.h> 46 #include <linux/pci.h> 47 #include <linux/pci_hotplug.h> 48 #include <linux/pci-acpi.h> 49 #include <linux/mutex.h> 50 #include <linux/slab.h> 51 #include <linux/acpi.h> 52 53 #include "../pci.h" 54 #include "acpiphp.h" 55 56 static LIST_HEAD(bridge_list); 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(struct pci_bus *bus); 63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); 64 65 /* callback routine to check for the existence of a pci dock device */ 66 static acpi_status 67 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) 68 { 69 int *count = (int *)context; 70 71 if (is_dock_device(handle)) { 72 (*count)++; 73 return AE_CTRL_TERMINATE; 74 } else { 75 return AE_OK; 76 } 77 } 78 79 /* 80 * the _DCK method can do funny things... and sometimes not 81 * hah-hah funny. 82 * 83 * TBD - figure out a way to only call fixups for 84 * systems that require them. 85 */ 86 static int post_dock_fixups(struct notifier_block *nb, unsigned long val, 87 void *v) 88 { 89 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); 90 struct pci_bus *bus = func->slot->bridge->pci_bus; 91 u32 buses; 92 93 if (!bus->self) 94 return NOTIFY_OK; 95 96 /* fixup bad _DCK function that rewrites 97 * secondary bridge on slot 98 */ 99 pci_read_config_dword(bus->self, 100 PCI_PRIMARY_BUS, 101 &buses); 102 103 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 104 buses = (buses & 0xff000000) 105 | ((unsigned int)(bus->primary) << 0) 106 | ((unsigned int)(bus->busn_res.start) << 8) 107 | ((unsigned int)(bus->busn_res.end) << 16); 108 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 109 } 110 return NOTIFY_OK; 111 } 112 113 114 static const struct acpi_dock_ops acpiphp_dock_ops = { 115 .handler = handle_hotplug_event_func, 116 }; 117 118 /* callback routine to register each ACPI PCI slot object */ 119 static acpi_status 120 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 121 { 122 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 123 struct acpiphp_slot *slot; 124 struct acpiphp_func *newfunc; 125 acpi_handle tmp; 126 acpi_status status = AE_OK; 127 unsigned long long adr, sun; 128 int device, function, retval; 129 struct pci_bus *pbus = bridge->pci_bus; 130 struct pci_dev *pdev; 131 132 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) 133 return AE_OK; 134 135 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 136 if (ACPI_FAILURE(status)) { 137 warn("can't evaluate _ADR (%#x)\n", status); 138 return AE_OK; 139 } 140 141 device = (adr >> 16) & 0xffff; 142 function = adr & 0xffff; 143 144 pdev = pbus->self; 145 if (pdev && pci_is_pcie(pdev)) { 146 tmp = acpi_find_root_bridge_handle(pdev); 147 if (tmp) { 148 struct acpi_pci_root *root = acpi_pci_find_root(tmp); 149 150 if (root && (root->osc_control_set & 151 OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 152 return AE_OK; 153 } 154 } 155 156 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 157 if (!newfunc) 158 return AE_NO_MEMORY; 159 160 INIT_LIST_HEAD(&newfunc->sibling); 161 newfunc->handle = handle; 162 newfunc->function = function; 163 164 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) 165 newfunc->flags = FUNC_HAS_EJ0; 166 167 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 168 newfunc->flags |= FUNC_HAS_STA; 169 170 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 171 newfunc->flags |= FUNC_HAS_PS0; 172 173 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 174 newfunc->flags |= FUNC_HAS_PS3; 175 176 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 177 newfunc->flags |= FUNC_HAS_DCK; 178 179 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 180 if (ACPI_FAILURE(status)) { 181 /* 182 * use the count of the number of slots we've found 183 * for the number of the slot 184 */ 185 sun = bridge->nr_slots+1; 186 } 187 188 /* search for objects that share the same slot */ 189 for (slot = bridge->slots; slot; slot = slot->next) 190 if (slot->device == device) { 191 if (slot->sun != sun) 192 warn("sibling found, but _SUN doesn't match!\n"); 193 break; 194 } 195 196 if (!slot) { 197 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 198 if (!slot) { 199 kfree(newfunc); 200 return AE_NO_MEMORY; 201 } 202 203 slot->bridge = bridge; 204 slot->device = device; 205 slot->sun = sun; 206 INIT_LIST_HEAD(&slot->funcs); 207 mutex_init(&slot->crit_sect); 208 209 slot->next = bridge->slots; 210 bridge->slots = slot; 211 212 bridge->nr_slots++; 213 214 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 215 slot->sun, pci_domain_nr(pbus), pbus->number, device); 216 retval = acpiphp_register_hotplug_slot(slot); 217 if (retval) { 218 if (retval == -EBUSY) 219 warn("Slot %llu already registered by another " 220 "hotplug driver\n", slot->sun); 221 else 222 warn("acpiphp_register_hotplug_slot failed " 223 "(err code = 0x%x)\n", retval); 224 goto err_exit; 225 } 226 } 227 228 newfunc->slot = slot; 229 list_add_tail(&newfunc->sibling, &slot->funcs); 230 231 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function)); 232 if (pdev) { 233 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 234 pci_dev_put(pdev); 235 } 236 237 if (is_dock_device(handle)) { 238 /* we don't want to call this device's _EJ0 239 * because we want the dock notify handler 240 * to call it after it calls _DCK 241 */ 242 newfunc->flags &= ~FUNC_HAS_EJ0; 243 if (register_hotplug_dock_device(handle, 244 &acpiphp_dock_ops, newfunc)) 245 dbg("failed to register dock device\n"); 246 247 /* we need to be notified when dock events happen 248 * outside of the hotplug operation, since we may 249 * need to do fixups before we can hotplug. 250 */ 251 newfunc->nb.notifier_call = post_dock_fixups; 252 if (register_dock_notifier(&newfunc->nb)) 253 dbg("failed to register a dock notifier"); 254 } 255 256 /* install notify handler */ 257 if (!(newfunc->flags & FUNC_HAS_DCK)) { 258 status = acpi_install_notify_handler(handle, 259 ACPI_SYSTEM_NOTIFY, 260 handle_hotplug_event_func, 261 newfunc); 262 263 if (ACPI_FAILURE(status)) 264 err("failed to register interrupt notify handler\n"); 265 } else 266 status = AE_OK; 267 268 return status; 269 270 err_exit: 271 bridge->nr_slots--; 272 bridge->slots = slot->next; 273 kfree(slot); 274 kfree(newfunc); 275 276 return AE_OK; 277 } 278 279 280 /* see if it's worth looking at this bridge */ 281 static int detect_ejectable_slots(acpi_handle handle) 282 { 283 int found = acpi_pci_detect_ejectable(handle); 284 if (!found) { 285 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 286 is_pci_dock_device, NULL, (void *)&found, NULL); 287 } 288 return found; 289 } 290 291 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 292 static void init_bridge_misc(struct acpiphp_bridge *bridge) 293 { 294 acpi_status status; 295 296 /* must be added to the list prior to calling register_slot */ 297 list_add(&bridge->list, &bridge_list); 298 299 /* register all slot objects under this bridge */ 300 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 301 register_slot, NULL, bridge, NULL); 302 if (ACPI_FAILURE(status)) { 303 list_del(&bridge->list); 304 return; 305 } 306 307 /* install notify handler */ 308 if (bridge->type != BRIDGE_TYPE_HOST) { 309 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 310 status = acpi_remove_notify_handler(bridge->func->handle, 311 ACPI_SYSTEM_NOTIFY, 312 handle_hotplug_event_func); 313 if (ACPI_FAILURE(status)) 314 err("failed to remove notify handler\n"); 315 } 316 status = acpi_install_notify_handler(bridge->handle, 317 ACPI_SYSTEM_NOTIFY, 318 handle_hotplug_event_bridge, 319 bridge); 320 321 if (ACPI_FAILURE(status)) { 322 err("failed to register interrupt notify handler\n"); 323 } 324 } 325 } 326 327 328 /* find acpiphp_func from acpiphp_bridge */ 329 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 330 { 331 struct acpiphp_bridge *bridge; 332 struct acpiphp_slot *slot; 333 struct acpiphp_func *func; 334 335 list_for_each_entry(bridge, &bridge_list, list) { 336 for (slot = bridge->slots; slot; slot = slot->next) { 337 list_for_each_entry(func, &slot->funcs, sibling) { 338 if (func->handle == handle) 339 return func; 340 } 341 } 342 } 343 344 return NULL; 345 } 346 347 348 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) 349 { 350 acpi_handle dummy_handle; 351 352 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 353 "_STA", &dummy_handle))) 354 bridge->flags |= BRIDGE_HAS_STA; 355 356 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 357 "_EJ0", &dummy_handle))) 358 bridge->flags |= BRIDGE_HAS_EJ0; 359 360 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 361 "_PS0", &dummy_handle))) 362 bridge->flags |= BRIDGE_HAS_PS0; 363 364 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 365 "_PS3", &dummy_handle))) 366 bridge->flags |= BRIDGE_HAS_PS3; 367 368 /* is this ejectable p2p bridge? */ 369 if (bridge->flags & BRIDGE_HAS_EJ0) { 370 struct acpiphp_func *func; 371 372 dbg("found ejectable p2p bridge\n"); 373 374 /* make link between PCI bridge and PCI function */ 375 func = acpiphp_bridge_handle_to_function(bridge->handle); 376 if (!func) 377 return; 378 bridge->func = func; 379 func->bridge = bridge; 380 } 381 } 382 383 384 /* allocate and initialize host bridge data structure */ 385 static void add_host_bridge(acpi_handle *handle) 386 { 387 struct acpiphp_bridge *bridge; 388 struct acpi_pci_root *root = acpi_pci_find_root(handle); 389 390 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 391 if (bridge == NULL) 392 return; 393 394 bridge->type = BRIDGE_TYPE_HOST; 395 bridge->handle = handle; 396 397 bridge->pci_bus = root->bus; 398 399 init_bridge_misc(bridge); 400 } 401 402 403 /* allocate and initialize PCI-to-PCI bridge data structure */ 404 static void add_p2p_bridge(acpi_handle *handle) 405 { 406 struct acpiphp_bridge *bridge; 407 408 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 409 if (bridge == NULL) { 410 err("out of memory\n"); 411 return; 412 } 413 414 bridge->type = BRIDGE_TYPE_P2P; 415 bridge->handle = handle; 416 config_p2p_bridge_flags(bridge); 417 418 bridge->pci_dev = acpi_get_pci_dev(handle); 419 bridge->pci_bus = bridge->pci_dev->subordinate; 420 if (!bridge->pci_bus) { 421 err("This is not a PCI-to-PCI bridge!\n"); 422 goto err; 423 } 424 425 /* 426 * Grab a ref to the subordinate PCI bus in case the bus is 427 * removed via PCI core logical hotplug. The ref pins the bus 428 * (which we access during module unload). 429 */ 430 get_device(&bridge->pci_bus->dev); 431 432 init_bridge_misc(bridge); 433 return; 434 err: 435 pci_dev_put(bridge->pci_dev); 436 kfree(bridge); 437 return; 438 } 439 440 441 /* callback routine to find P2P bridges */ 442 static acpi_status 443 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 444 { 445 acpi_status status; 446 struct pci_dev *dev; 447 448 dev = acpi_get_pci_dev(handle); 449 if (!dev || !dev->subordinate) 450 goto out; 451 452 /* check if this bridge has ejectable slots */ 453 if ((detect_ejectable_slots(handle) > 0)) { 454 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 455 add_p2p_bridge(handle); 456 } 457 458 /* search P2P bridges under this p2p bridge */ 459 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 460 find_p2p_bridge, NULL, NULL, NULL); 461 if (ACPI_FAILURE(status)) 462 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 463 464 out: 465 pci_dev_put(dev); 466 return AE_OK; 467 } 468 469 470 /* find hot-pluggable slots, and then find P2P bridge */ 471 static int add_bridge(acpi_handle handle) 472 { 473 acpi_status status; 474 unsigned long long tmp; 475 acpi_handle dummy_handle; 476 477 /* if the bridge doesn't have _STA, we assume it is always there */ 478 status = acpi_get_handle(handle, "_STA", &dummy_handle); 479 if (ACPI_SUCCESS(status)) { 480 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 481 if (ACPI_FAILURE(status)) { 482 dbg("%s: _STA evaluation failure\n", __func__); 483 return 0; 484 } 485 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 486 /* don't register this object */ 487 return 0; 488 } 489 490 /* check if this bridge has ejectable slots */ 491 if (detect_ejectable_slots(handle) > 0) { 492 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 493 add_host_bridge(handle); 494 } 495 496 /* search P2P bridges under this host bridge */ 497 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 498 find_p2p_bridge, NULL, NULL, NULL); 499 500 if (ACPI_FAILURE(status)) 501 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 502 503 return 0; 504 } 505 506 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 507 { 508 struct acpiphp_bridge *bridge; 509 510 list_for_each_entry(bridge, &bridge_list, list) 511 if (bridge->handle == handle) 512 return bridge; 513 514 return NULL; 515 } 516 517 static void cleanup_bridge(struct acpiphp_bridge *bridge) 518 { 519 struct acpiphp_slot *slot, *next; 520 struct acpiphp_func *func, *tmp; 521 acpi_status status; 522 acpi_handle handle = bridge->handle; 523 524 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 525 handle_hotplug_event_bridge); 526 if (ACPI_FAILURE(status)) 527 err("failed to remove notify handler\n"); 528 529 if ((bridge->type != BRIDGE_TYPE_HOST) && 530 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 531 status = acpi_install_notify_handler(bridge->func->handle, 532 ACPI_SYSTEM_NOTIFY, 533 handle_hotplug_event_func, 534 bridge->func); 535 if (ACPI_FAILURE(status)) 536 err("failed to install interrupt notify handler\n"); 537 } 538 539 slot = bridge->slots; 540 while (slot) { 541 next = slot->next; 542 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) { 543 if (is_dock_device(func->handle)) { 544 unregister_hotplug_dock_device(func->handle); 545 unregister_dock_notifier(&func->nb); 546 } 547 if (!(func->flags & FUNC_HAS_DCK)) { 548 status = acpi_remove_notify_handler(func->handle, 549 ACPI_SYSTEM_NOTIFY, 550 handle_hotplug_event_func); 551 if (ACPI_FAILURE(status)) 552 err("failed to remove notify handler\n"); 553 } 554 list_del(&func->sibling); 555 kfree(func); 556 } 557 acpiphp_unregister_hotplug_slot(slot); 558 list_del(&slot->funcs); 559 kfree(slot); 560 slot = next; 561 } 562 563 /* 564 * Only P2P bridges have a pci_dev 565 */ 566 if (bridge->pci_dev) 567 put_device(&bridge->pci_bus->dev); 568 569 pci_dev_put(bridge->pci_dev); 570 list_del(&bridge->list); 571 kfree(bridge); 572 } 573 574 static acpi_status 575 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 576 { 577 struct acpiphp_bridge *bridge; 578 579 /* cleanup p2p bridges under this P2P bridge 580 in a depth-first manner */ 581 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 582 cleanup_p2p_bridge, NULL, NULL, NULL); 583 584 bridge = acpiphp_handle_to_bridge(handle); 585 if (bridge) 586 cleanup_bridge(bridge); 587 588 return AE_OK; 589 } 590 591 static void remove_bridge(acpi_handle handle) 592 { 593 struct acpiphp_bridge *bridge; 594 595 /* cleanup p2p bridges under this host bridge 596 in a depth-first manner */ 597 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 598 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL); 599 600 /* 601 * On root bridges with hotplug slots directly underneath (ie, 602 * no p2p bridge between), we call cleanup_bridge(). 603 * 604 * The else clause cleans up root bridges that either had no 605 * hotplug slots at all, or had a p2p bridge underneath. 606 */ 607 bridge = acpiphp_handle_to_bridge(handle); 608 if (bridge) 609 cleanup_bridge(bridge); 610 else 611 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 612 handle_hotplug_event_bridge); 613 } 614 615 static int power_on_slot(struct acpiphp_slot *slot) 616 { 617 acpi_status status; 618 struct acpiphp_func *func; 619 int retval = 0; 620 621 /* if already enabled, just skip */ 622 if (slot->flags & SLOT_POWEREDON) 623 goto err_exit; 624 625 list_for_each_entry(func, &slot->funcs, sibling) { 626 if (func->flags & FUNC_HAS_PS0) { 627 dbg("%s: executing _PS0\n", __func__); 628 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 629 if (ACPI_FAILURE(status)) { 630 warn("%s: _PS0 failed\n", __func__); 631 retval = -1; 632 goto err_exit; 633 } else 634 break; 635 } 636 } 637 638 /* TBD: evaluate _STA to check if the slot is enabled */ 639 640 slot->flags |= SLOT_POWEREDON; 641 642 err_exit: 643 return retval; 644 } 645 646 647 static int power_off_slot(struct acpiphp_slot *slot) 648 { 649 acpi_status status; 650 struct acpiphp_func *func; 651 652 int retval = 0; 653 654 /* if already disabled, just skip */ 655 if ((slot->flags & SLOT_POWEREDON) == 0) 656 goto err_exit; 657 658 list_for_each_entry(func, &slot->funcs, sibling) { 659 if (func->flags & FUNC_HAS_PS3) { 660 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 661 if (ACPI_FAILURE(status)) { 662 warn("%s: _PS3 failed\n", __func__); 663 retval = -1; 664 goto err_exit; 665 } else 666 break; 667 } 668 } 669 670 /* TBD: evaluate _STA to check if the slot is disabled */ 671 672 slot->flags &= (~SLOT_POWEREDON); 673 674 err_exit: 675 return retval; 676 } 677 678 679 680 /** 681 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 682 * @bus: bus to start search with 683 */ 684 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 685 { 686 struct list_head *tmp; 687 unsigned char max, n; 688 689 /* 690 * pci_bus_max_busnr will return the highest 691 * reserved busnr for all these children. 692 * that is equivalent to the bus->subordinate 693 * value. We don't want to use the parent's 694 * bus->subordinate value because it could have 695 * padding in it. 696 */ 697 max = bus->busn_res.start; 698 699 list_for_each(tmp, &bus->children) { 700 n = pci_bus_max_busnr(pci_bus_b(tmp)); 701 if (n > max) 702 max = n; 703 } 704 return max; 705 } 706 707 708 /** 709 * acpiphp_bus_add - add a new bus to acpi subsystem 710 * @func: acpiphp_func of the bridge 711 */ 712 static int acpiphp_bus_add(struct acpiphp_func *func) 713 { 714 acpi_handle phandle; 715 struct acpi_device *device, *pdevice; 716 int ret_val; 717 718 acpi_get_parent(func->handle, &phandle); 719 if (acpi_bus_get_device(phandle, &pdevice)) { 720 dbg("no parent device, assuming NULL\n"); 721 pdevice = NULL; 722 } 723 if (!acpi_bus_get_device(func->handle, &device)) { 724 dbg("bus exists... trim\n"); 725 /* this shouldn't be in here, so remove 726 * the bus then re-add it... 727 */ 728 ret_val = acpi_bus_trim(device, 1); 729 dbg("acpi_bus_trim return %x\n", ret_val); 730 } 731 732 ret_val = acpi_bus_add(&device, pdevice, func->handle, 733 ACPI_BUS_TYPE_DEVICE); 734 if (ret_val) { 735 dbg("error adding bus, %x\n", 736 -ret_val); 737 goto acpiphp_bus_add_out; 738 } 739 ret_val = acpi_bus_start(device); 740 741 acpiphp_bus_add_out: 742 return ret_val; 743 } 744 745 746 /** 747 * acpiphp_bus_trim - trim a bus from acpi subsystem 748 * @handle: handle to acpi namespace 749 */ 750 static int acpiphp_bus_trim(acpi_handle handle) 751 { 752 struct acpi_device *device; 753 int retval; 754 755 retval = acpi_bus_get_device(handle, &device); 756 if (retval) { 757 dbg("acpi_device not found\n"); 758 return retval; 759 } 760 761 retval = acpi_bus_trim(device, 1); 762 if (retval) 763 err("cannot remove from acpi list\n"); 764 765 return retval; 766 } 767 768 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 769 { 770 struct acpiphp_func *func; 771 union acpi_object params[2]; 772 struct acpi_object_list arg_list; 773 774 list_for_each_entry(func, &slot->funcs, sibling) { 775 arg_list.count = 2; 776 arg_list.pointer = params; 777 params[0].type = ACPI_TYPE_INTEGER; 778 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 779 params[1].type = ACPI_TYPE_INTEGER; 780 params[1].integer.value = 1; 781 /* _REG is optional, we don't care about if there is failure */ 782 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL); 783 } 784 } 785 786 /** 787 * enable_device - enable, configure a slot 788 * @slot: slot to be enabled 789 * 790 * This function should be called per *physical slot*, 791 * not per each slot object in ACPI namespace. 792 */ 793 static int __ref enable_device(struct acpiphp_slot *slot) 794 { 795 struct pci_dev *dev; 796 struct pci_bus *bus = slot->bridge->pci_bus; 797 struct acpiphp_func *func; 798 int retval = 0; 799 int num, max, pass; 800 acpi_status status; 801 802 if (slot->flags & SLOT_ENABLED) 803 goto err_exit; 804 805 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 806 if (num == 0) { 807 /* Maybe only part of funcs are added. */ 808 dbg("No new device found\n"); 809 goto err_exit; 810 } 811 812 max = acpiphp_max_busnr(bus); 813 for (pass = 0; pass < 2; pass++) { 814 list_for_each_entry(dev, &bus->devices, bus_list) { 815 if (PCI_SLOT(dev->devfn) != slot->device) 816 continue; 817 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 818 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 819 max = pci_scan_bridge(bus, dev, max, pass); 820 if (pass && dev->subordinate) 821 pci_bus_size_bridges(dev->subordinate); 822 } 823 } 824 } 825 826 list_for_each_entry(func, &slot->funcs, sibling) 827 acpiphp_bus_add(func); 828 829 pci_bus_assign_resources(bus); 830 acpiphp_sanitize_bus(bus); 831 acpiphp_set_hpp_values(bus); 832 acpiphp_set_acpi_region(slot); 833 pci_enable_bridges(bus); 834 835 list_for_each_entry(dev, &bus->devices, bus_list) { 836 /* Assume that newly added devices are powered on already. */ 837 if (!dev->is_added) 838 dev->current_state = PCI_D0; 839 } 840 841 pci_bus_add_devices(bus); 842 843 slot->flags |= SLOT_ENABLED; 844 list_for_each_entry(func, &slot->funcs, sibling) { 845 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 846 func->function)); 847 if (!dev) { 848 /* Do not set SLOT_ENABLED flag if some funcs 849 are not added. */ 850 slot->flags &= (~SLOT_ENABLED); 851 continue; 852 } 853 854 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 855 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) { 856 pci_dev_put(dev); 857 continue; 858 } 859 860 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 861 if (ACPI_FAILURE(status)) 862 warn("find_p2p_bridge failed (error code = 0x%x)\n", 863 status); 864 pci_dev_put(dev); 865 } 866 867 868 err_exit: 869 return retval; 870 } 871 872 /* return first device in slot, acquiring a reference on it */ 873 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 874 { 875 struct pci_bus *bus = slot->bridge->pci_bus; 876 struct pci_dev *dev; 877 struct pci_dev *ret = NULL; 878 879 down_read(&pci_bus_sem); 880 list_for_each_entry(dev, &bus->devices, bus_list) 881 if (PCI_SLOT(dev->devfn) == slot->device) { 882 ret = pci_dev_get(dev); 883 break; 884 } 885 up_read(&pci_bus_sem); 886 887 return ret; 888 } 889 890 /** 891 * disable_device - disable a slot 892 * @slot: ACPI PHP slot 893 */ 894 static int disable_device(struct acpiphp_slot *slot) 895 { 896 struct acpiphp_func *func; 897 struct pci_dev *pdev; 898 struct pci_bus *bus = slot->bridge->pci_bus; 899 900 /* The slot will be enabled when func 0 is added, so check 901 func 0 before disable the slot. */ 902 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 903 if (!pdev) 904 goto err_exit; 905 pci_dev_put(pdev); 906 907 list_for_each_entry(func, &slot->funcs, sibling) { 908 if (func->bridge) { 909 /* cleanup p2p bridges under this P2P bridge */ 910 cleanup_p2p_bridge(func->bridge->handle, 911 (u32)1, NULL, NULL); 912 func->bridge = NULL; 913 } 914 } 915 916 /* 917 * enable_device() enumerates all functions in this device via 918 * pci_scan_slot(), whether they have associated ACPI hotplug 919 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 920 * here. 921 */ 922 while ((pdev = dev_in_slot(slot))) { 923 pci_stop_bus_device(pdev); 924 __pci_remove_bus_device(pdev); 925 pci_dev_put(pdev); 926 } 927 928 list_for_each_entry(func, &slot->funcs, sibling) { 929 acpiphp_bus_trim(func->handle); 930 } 931 932 slot->flags &= (~SLOT_ENABLED); 933 934 err_exit: 935 return 0; 936 } 937 938 939 /** 940 * get_slot_status - get ACPI slot status 941 * @slot: ACPI PHP slot 942 * 943 * If a slot has _STA for each function and if any one of them 944 * returned non-zero status, return it. 945 * 946 * If a slot doesn't have _STA and if any one of its functions' 947 * configuration space is configured, return 0x0f as a _STA. 948 * 949 * Otherwise return 0. 950 */ 951 static unsigned int get_slot_status(struct acpiphp_slot *slot) 952 { 953 acpi_status status; 954 unsigned long long sta = 0; 955 u32 dvid; 956 struct acpiphp_func *func; 957 958 list_for_each_entry(func, &slot->funcs, sibling) { 959 if (func->flags & FUNC_HAS_STA) { 960 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 961 if (ACPI_SUCCESS(status) && sta) 962 break; 963 } else { 964 pci_bus_read_config_dword(slot->bridge->pci_bus, 965 PCI_DEVFN(slot->device, 966 func->function), 967 PCI_VENDOR_ID, &dvid); 968 if (dvid != 0xffffffff) { 969 sta = ACPI_STA_ALL; 970 break; 971 } 972 } 973 } 974 975 return (unsigned int)sta; 976 } 977 978 /** 979 * acpiphp_eject_slot - physically eject the slot 980 * @slot: ACPI PHP slot 981 */ 982 int acpiphp_eject_slot(struct acpiphp_slot *slot) 983 { 984 acpi_status status; 985 struct acpiphp_func *func; 986 struct acpi_object_list arg_list; 987 union acpi_object arg; 988 989 list_for_each_entry(func, &slot->funcs, sibling) { 990 /* We don't want to call _EJ0 on non-existing functions. */ 991 if ((func->flags & FUNC_HAS_EJ0)) { 992 /* _EJ0 method take one argument */ 993 arg_list.count = 1; 994 arg_list.pointer = &arg; 995 arg.type = ACPI_TYPE_INTEGER; 996 arg.integer.value = 1; 997 998 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 999 if (ACPI_FAILURE(status)) { 1000 warn("%s: _EJ0 failed\n", __func__); 1001 return -1; 1002 } else 1003 break; 1004 } 1005 } 1006 return 0; 1007 } 1008 1009 /** 1010 * acpiphp_check_bridge - re-enumerate devices 1011 * @bridge: where to begin re-enumeration 1012 * 1013 * Iterate over all slots under this bridge and make sure that if a 1014 * card is present they are enabled, and if not they are disabled. 1015 */ 1016 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1017 { 1018 struct acpiphp_slot *slot; 1019 int retval = 0; 1020 int enabled, disabled; 1021 1022 enabled = disabled = 0; 1023 1024 for (slot = bridge->slots; slot; slot = slot->next) { 1025 unsigned int status = get_slot_status(slot); 1026 if (slot->flags & SLOT_ENABLED) { 1027 if (status == ACPI_STA_ALL) 1028 continue; 1029 retval = acpiphp_disable_slot(slot); 1030 if (retval) { 1031 err("Error occurred in disabling\n"); 1032 goto err_exit; 1033 } else { 1034 acpiphp_eject_slot(slot); 1035 } 1036 disabled++; 1037 } else { 1038 if (status != ACPI_STA_ALL) 1039 continue; 1040 retval = acpiphp_enable_slot(slot); 1041 if (retval) { 1042 err("Error occurred in enabling\n"); 1043 goto err_exit; 1044 } 1045 enabled++; 1046 } 1047 } 1048 1049 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 1050 1051 err_exit: 1052 return retval; 1053 } 1054 1055 static void acpiphp_set_hpp_values(struct pci_bus *bus) 1056 { 1057 struct pci_dev *dev; 1058 1059 list_for_each_entry(dev, &bus->devices, bus_list) 1060 pci_configure_slot(dev); 1061 } 1062 1063 /* 1064 * Remove devices for which we could not assign resources, call 1065 * arch specific code to fix-up the bus 1066 */ 1067 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1068 { 1069 struct pci_dev *dev; 1070 int i; 1071 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1072 1073 list_for_each_entry(dev, &bus->devices, bus_list) { 1074 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1075 struct resource *res = &dev->resource[i]; 1076 if ((res->flags & type_mask) && !res->start && 1077 res->end) { 1078 /* Could not assign a required resources 1079 * for this device, remove it */ 1080 pci_stop_and_remove_bus_device(dev); 1081 break; 1082 } 1083 } 1084 } 1085 } 1086 1087 /* Program resources in newly inserted bridge */ 1088 static int acpiphp_configure_bridge (acpi_handle handle) 1089 { 1090 struct pci_bus *bus; 1091 1092 if (acpi_is_root_bridge(handle)) { 1093 struct acpi_pci_root *root = acpi_pci_find_root(handle); 1094 bus = root->bus; 1095 } else { 1096 struct pci_dev *pdev = acpi_get_pci_dev(handle); 1097 bus = pdev->subordinate; 1098 pci_dev_put(pdev); 1099 } 1100 1101 pci_bus_size_bridges(bus); 1102 pci_bus_assign_resources(bus); 1103 acpiphp_sanitize_bus(bus); 1104 acpiphp_set_hpp_values(bus); 1105 pci_enable_bridges(bus); 1106 return 0; 1107 } 1108 1109 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1110 { 1111 struct acpi_device *device, *pdevice; 1112 acpi_handle phandle; 1113 1114 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1115 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1116 err("unexpected notification type %d\n", type); 1117 return; 1118 } 1119 1120 acpi_get_parent(handle, &phandle); 1121 if (acpi_bus_get_device(phandle, &pdevice)) { 1122 dbg("no parent device, assuming NULL\n"); 1123 pdevice = NULL; 1124 } 1125 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1126 err("cannot add bridge to acpi list\n"); 1127 return; 1128 } 1129 if (!acpiphp_configure_bridge(handle) && 1130 !acpi_bus_start(device)) 1131 add_bridge(handle); 1132 else 1133 err("cannot configure and start bridge\n"); 1134 1135 } 1136 1137 /* 1138 * ACPI event handlers 1139 */ 1140 1141 static acpi_status 1142 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1143 { 1144 int *count = (int *)context; 1145 struct acpiphp_bridge *bridge; 1146 1147 bridge = acpiphp_handle_to_bridge(handle); 1148 if (bridge) 1149 (*count)++; 1150 return AE_OK ; 1151 } 1152 1153 static acpi_status 1154 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1155 { 1156 struct acpiphp_bridge *bridge; 1157 char objname[64]; 1158 struct acpi_buffer buffer = { .length = sizeof(objname), 1159 .pointer = objname }; 1160 1161 bridge = acpiphp_handle_to_bridge(handle); 1162 if (bridge) { 1163 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1164 dbg("%s: re-enumerating slots under %s\n", 1165 __func__, objname); 1166 acpiphp_check_bridge(bridge); 1167 } 1168 return AE_OK ; 1169 } 1170 1171 struct acpiphp_hp_work { 1172 struct work_struct work; 1173 acpi_handle handle; 1174 u32 type; 1175 void *context; 1176 }; 1177 1178 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type, 1179 void *context, 1180 void (*func)(struct work_struct *work)) 1181 { 1182 struct acpiphp_hp_work *hp_work; 1183 int ret; 1184 1185 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); 1186 if (!hp_work) 1187 return; 1188 1189 hp_work->handle = handle; 1190 hp_work->type = type; 1191 hp_work->context = context; 1192 1193 INIT_WORK(&hp_work->work, func); 1194 ret = queue_work(kacpi_hotplug_wq, &hp_work->work); 1195 if (!ret) 1196 kfree(hp_work); 1197 } 1198 1199 static void _handle_hotplug_event_bridge(struct work_struct *work) 1200 { 1201 struct acpiphp_bridge *bridge; 1202 char objname[64]; 1203 struct acpi_buffer buffer = { .length = sizeof(objname), 1204 .pointer = objname }; 1205 struct acpi_device *device; 1206 int num_sub_bridges = 0; 1207 struct acpiphp_hp_work *hp_work; 1208 acpi_handle handle; 1209 u32 type; 1210 1211 hp_work = container_of(work, struct acpiphp_hp_work, work); 1212 handle = hp_work->handle; 1213 type = hp_work->type; 1214 1215 if (acpi_bus_get_device(handle, &device)) { 1216 /* This bridge must have just been physically inserted */ 1217 handle_bridge_insertion(handle, type); 1218 goto out; 1219 } 1220 1221 bridge = acpiphp_handle_to_bridge(handle); 1222 if (type == ACPI_NOTIFY_BUS_CHECK) { 1223 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1224 count_sub_bridges, NULL, &num_sub_bridges, NULL); 1225 } 1226 1227 if (!bridge && !num_sub_bridges) { 1228 err("cannot get bridge info\n"); 1229 goto out; 1230 } 1231 1232 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1233 1234 switch (type) { 1235 case ACPI_NOTIFY_BUS_CHECK: 1236 /* bus re-enumerate */ 1237 dbg("%s: Bus check notify on %s\n", __func__, objname); 1238 if (bridge) { 1239 dbg("%s: re-enumerating slots under %s\n", 1240 __func__, objname); 1241 acpiphp_check_bridge(bridge); 1242 } 1243 if (num_sub_bridges) 1244 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1245 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1246 break; 1247 1248 case ACPI_NOTIFY_DEVICE_CHECK: 1249 /* device check */ 1250 dbg("%s: Device check notify on %s\n", __func__, objname); 1251 acpiphp_check_bridge(bridge); 1252 break; 1253 1254 case ACPI_NOTIFY_DEVICE_WAKE: 1255 /* wake event */ 1256 dbg("%s: Device wake notify on %s\n", __func__, objname); 1257 break; 1258 1259 case ACPI_NOTIFY_EJECT_REQUEST: 1260 /* request device eject */ 1261 dbg("%s: Device eject notify on %s\n", __func__, objname); 1262 if ((bridge->type != BRIDGE_TYPE_HOST) && 1263 (bridge->flags & BRIDGE_HAS_EJ0)) { 1264 struct acpiphp_slot *slot; 1265 slot = bridge->func->slot; 1266 if (!acpiphp_disable_slot(slot)) 1267 acpiphp_eject_slot(slot); 1268 } 1269 break; 1270 1271 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1272 printk(KERN_ERR "Device %s cannot be configured due" 1273 " to a frequency mismatch\n", objname); 1274 break; 1275 1276 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1277 printk(KERN_ERR "Device %s cannot be configured due" 1278 " to a bus mode mismatch\n", objname); 1279 break; 1280 1281 case ACPI_NOTIFY_POWER_FAULT: 1282 printk(KERN_ERR "Device %s has suffered a power fault\n", 1283 objname); 1284 break; 1285 1286 default: 1287 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1288 break; 1289 } 1290 1291 out: 1292 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1293 } 1294 1295 /** 1296 * handle_hotplug_event_bridge - handle ACPI event on bridges 1297 * @handle: Notify()'ed acpi_handle 1298 * @type: Notify code 1299 * @context: pointer to acpiphp_bridge structure 1300 * 1301 * Handles ACPI event notification on {host,p2p} bridges. 1302 */ 1303 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, 1304 void *context) 1305 { 1306 /* 1307 * Currently the code adds all hotplug events to the kacpid_wq 1308 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1309 * The proper way to fix this is to reorganize the code so that 1310 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1311 * For now just re-add this work to the kacpi_hotplug_wq so we 1312 * don't deadlock on hotplug actions. 1313 */ 1314 alloc_acpiphp_hp_work(handle, type, context, 1315 _handle_hotplug_event_bridge); 1316 } 1317 1318 static void _handle_hotplug_event_func(struct work_struct *work) 1319 { 1320 struct acpiphp_func *func; 1321 char objname[64]; 1322 struct acpi_buffer buffer = { .length = sizeof(objname), 1323 .pointer = objname }; 1324 struct acpiphp_hp_work *hp_work; 1325 acpi_handle handle; 1326 u32 type; 1327 void *context; 1328 1329 hp_work = container_of(work, struct acpiphp_hp_work, work); 1330 handle = hp_work->handle; 1331 type = hp_work->type; 1332 context = hp_work->context; 1333 1334 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1335 1336 func = (struct acpiphp_func *)context; 1337 1338 switch (type) { 1339 case ACPI_NOTIFY_BUS_CHECK: 1340 /* bus re-enumerate */ 1341 dbg("%s: Bus check notify on %s\n", __func__, objname); 1342 acpiphp_enable_slot(func->slot); 1343 break; 1344 1345 case ACPI_NOTIFY_DEVICE_CHECK: 1346 /* device check : re-enumerate from parent bus */ 1347 dbg("%s: Device check notify on %s\n", __func__, objname); 1348 acpiphp_check_bridge(func->slot->bridge); 1349 break; 1350 1351 case ACPI_NOTIFY_DEVICE_WAKE: 1352 /* wake event */ 1353 dbg("%s: Device wake notify on %s\n", __func__, objname); 1354 break; 1355 1356 case ACPI_NOTIFY_EJECT_REQUEST: 1357 /* request device eject */ 1358 dbg("%s: Device eject notify on %s\n", __func__, objname); 1359 if (!(acpiphp_disable_slot(func->slot))) 1360 acpiphp_eject_slot(func->slot); 1361 break; 1362 1363 default: 1364 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1365 break; 1366 } 1367 1368 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1369 } 1370 1371 /** 1372 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1373 * @handle: Notify()'ed acpi_handle 1374 * @type: Notify code 1375 * @context: pointer to acpiphp_func structure 1376 * 1377 * Handles ACPI event notification on slots. 1378 */ 1379 static void handle_hotplug_event_func(acpi_handle handle, u32 type, 1380 void *context) 1381 { 1382 /* 1383 * Currently the code adds all hotplug events to the kacpid_wq 1384 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1385 * The proper way to fix this is to reorganize the code so that 1386 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1387 * For now just re-add this work to the kacpi_hotplug_wq so we 1388 * don't deadlock on hotplug actions. 1389 */ 1390 alloc_acpiphp_hp_work(handle, type, context, 1391 _handle_hotplug_event_func); 1392 } 1393 1394 static acpi_status 1395 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1396 { 1397 int *count = (int *)context; 1398 1399 if (!acpi_is_root_bridge(handle)) 1400 return AE_OK; 1401 1402 (*count)++; 1403 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1404 handle_hotplug_event_bridge, NULL); 1405 1406 return AE_OK ; 1407 } 1408 1409 static struct acpi_pci_driver acpi_pci_hp_driver = { 1410 .add = add_bridge, 1411 .remove = remove_bridge, 1412 }; 1413 1414 /** 1415 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1416 */ 1417 int __init acpiphp_glue_init(void) 1418 { 1419 int num = 0; 1420 1421 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1422 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); 1423 1424 if (num <= 0) 1425 return -1; 1426 else 1427 acpi_pci_register_driver(&acpi_pci_hp_driver); 1428 1429 return 0; 1430 } 1431 1432 1433 /** 1434 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1435 * 1436 * This function frees all data allocated in acpiphp_glue_init(). 1437 */ 1438 void acpiphp_glue_exit(void) 1439 { 1440 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1441 } 1442 1443 1444 /** 1445 * acpiphp_get_num_slots - count number of slots in a system 1446 */ 1447 int __init acpiphp_get_num_slots(void) 1448 { 1449 struct acpiphp_bridge *bridge; 1450 int num_slots = 0; 1451 1452 list_for_each_entry(bridge, &bridge_list, list) { 1453 dbg("Bus %04x:%02x has %d slot%s\n", 1454 pci_domain_nr(bridge->pci_bus), 1455 bridge->pci_bus->number, bridge->nr_slots, 1456 bridge->nr_slots == 1 ? "" : "s"); 1457 num_slots += bridge->nr_slots; 1458 } 1459 1460 dbg("Total %d slots\n", num_slots); 1461 return num_slots; 1462 } 1463 1464 1465 #if 0 1466 /** 1467 * acpiphp_for_each_slot - call function for each slot 1468 * @fn: callback function 1469 * @data: context to be passed to callback function 1470 */ 1471 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1472 { 1473 struct list_head *node; 1474 struct acpiphp_bridge *bridge; 1475 struct acpiphp_slot *slot; 1476 int retval = 0; 1477 1478 list_for_each (node, &bridge_list) { 1479 bridge = (struct acpiphp_bridge *)node; 1480 for (slot = bridge->slots; slot; slot = slot->next) { 1481 retval = fn(slot, data); 1482 if (!retval) 1483 goto err_exit; 1484 } 1485 } 1486 1487 err_exit: 1488 return retval; 1489 } 1490 #endif 1491 1492 1493 /** 1494 * acpiphp_enable_slot - power on slot 1495 * @slot: ACPI PHP slot 1496 */ 1497 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1498 { 1499 int retval; 1500 1501 mutex_lock(&slot->crit_sect); 1502 1503 /* wake up all functions */ 1504 retval = power_on_slot(slot); 1505 if (retval) 1506 goto err_exit; 1507 1508 if (get_slot_status(slot) == ACPI_STA_ALL) { 1509 /* configure all functions */ 1510 retval = enable_device(slot); 1511 if (retval) 1512 power_off_slot(slot); 1513 } else { 1514 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1515 power_off_slot(slot); 1516 } 1517 1518 err_exit: 1519 mutex_unlock(&slot->crit_sect); 1520 return retval; 1521 } 1522 1523 /** 1524 * acpiphp_disable_slot - power off slot 1525 * @slot: ACPI PHP slot 1526 */ 1527 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1528 { 1529 int retval = 0; 1530 1531 mutex_lock(&slot->crit_sect); 1532 1533 /* unconfigure all functions */ 1534 retval = disable_device(slot); 1535 if (retval) 1536 goto err_exit; 1537 1538 /* power off all functions */ 1539 retval = power_off_slot(slot); 1540 if (retval) 1541 goto err_exit; 1542 1543 err_exit: 1544 mutex_unlock(&slot->crit_sect); 1545 return retval; 1546 } 1547 1548 1549 /* 1550 * slot enabled: 1 1551 * slot disabled: 0 1552 */ 1553 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1554 { 1555 return (slot->flags & SLOT_POWEREDON); 1556 } 1557 1558 1559 /* 1560 * latch open: 1 1561 * latch closed: 0 1562 */ 1563 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1564 { 1565 unsigned int sta; 1566 1567 sta = get_slot_status(slot); 1568 1569 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1570 } 1571 1572 1573 /* 1574 * adapter presence : 1 1575 * absence : 0 1576 */ 1577 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1578 { 1579 unsigned int sta; 1580 1581 sta = get_slot_status(slot); 1582 1583 return (sta == 0) ? 0 : 1; 1584 } 1585