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_and_remove_bus_device(pdev); 924 pci_dev_put(pdev); 925 } 926 927 list_for_each_entry(func, &slot->funcs, sibling) { 928 acpiphp_bus_trim(func->handle); 929 } 930 931 slot->flags &= (~SLOT_ENABLED); 932 933 err_exit: 934 return 0; 935 } 936 937 938 /** 939 * get_slot_status - get ACPI slot status 940 * @slot: ACPI PHP slot 941 * 942 * If a slot has _STA for each function and if any one of them 943 * returned non-zero status, return it. 944 * 945 * If a slot doesn't have _STA and if any one of its functions' 946 * configuration space is configured, return 0x0f as a _STA. 947 * 948 * Otherwise return 0. 949 */ 950 static unsigned int get_slot_status(struct acpiphp_slot *slot) 951 { 952 acpi_status status; 953 unsigned long long sta = 0; 954 u32 dvid; 955 struct acpiphp_func *func; 956 957 list_for_each_entry(func, &slot->funcs, sibling) { 958 if (func->flags & FUNC_HAS_STA) { 959 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 960 if (ACPI_SUCCESS(status) && sta) 961 break; 962 } else { 963 pci_bus_read_config_dword(slot->bridge->pci_bus, 964 PCI_DEVFN(slot->device, 965 func->function), 966 PCI_VENDOR_ID, &dvid); 967 if (dvid != 0xffffffff) { 968 sta = ACPI_STA_ALL; 969 break; 970 } 971 } 972 } 973 974 return (unsigned int)sta; 975 } 976 977 /** 978 * acpiphp_eject_slot - physically eject the slot 979 * @slot: ACPI PHP slot 980 */ 981 int acpiphp_eject_slot(struct acpiphp_slot *slot) 982 { 983 acpi_status status; 984 struct acpiphp_func *func; 985 struct acpi_object_list arg_list; 986 union acpi_object arg; 987 988 list_for_each_entry(func, &slot->funcs, sibling) { 989 /* We don't want to call _EJ0 on non-existing functions. */ 990 if ((func->flags & FUNC_HAS_EJ0)) { 991 /* _EJ0 method take one argument */ 992 arg_list.count = 1; 993 arg_list.pointer = &arg; 994 arg.type = ACPI_TYPE_INTEGER; 995 arg.integer.value = 1; 996 997 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 998 if (ACPI_FAILURE(status)) { 999 warn("%s: _EJ0 failed\n", __func__); 1000 return -1; 1001 } else 1002 break; 1003 } 1004 } 1005 return 0; 1006 } 1007 1008 /** 1009 * acpiphp_check_bridge - re-enumerate devices 1010 * @bridge: where to begin re-enumeration 1011 * 1012 * Iterate over all slots under this bridge and make sure that if a 1013 * card is present they are enabled, and if not they are disabled. 1014 */ 1015 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1016 { 1017 struct acpiphp_slot *slot; 1018 int retval = 0; 1019 int enabled, disabled; 1020 1021 enabled = disabled = 0; 1022 1023 for (slot = bridge->slots; slot; slot = slot->next) { 1024 unsigned int status = get_slot_status(slot); 1025 if (slot->flags & SLOT_ENABLED) { 1026 if (status == ACPI_STA_ALL) 1027 continue; 1028 retval = acpiphp_disable_slot(slot); 1029 if (retval) { 1030 err("Error occurred in disabling\n"); 1031 goto err_exit; 1032 } else { 1033 acpiphp_eject_slot(slot); 1034 } 1035 disabled++; 1036 } else { 1037 if (status != ACPI_STA_ALL) 1038 continue; 1039 retval = acpiphp_enable_slot(slot); 1040 if (retval) { 1041 err("Error occurred in enabling\n"); 1042 goto err_exit; 1043 } 1044 enabled++; 1045 } 1046 } 1047 1048 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 1049 1050 err_exit: 1051 return retval; 1052 } 1053 1054 static void acpiphp_set_hpp_values(struct pci_bus *bus) 1055 { 1056 struct pci_dev *dev; 1057 1058 list_for_each_entry(dev, &bus->devices, bus_list) 1059 pci_configure_slot(dev); 1060 } 1061 1062 /* 1063 * Remove devices for which we could not assign resources, call 1064 * arch specific code to fix-up the bus 1065 */ 1066 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1067 { 1068 struct pci_dev *dev; 1069 int i; 1070 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1071 1072 list_for_each_entry(dev, &bus->devices, bus_list) { 1073 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1074 struct resource *res = &dev->resource[i]; 1075 if ((res->flags & type_mask) && !res->start && 1076 res->end) { 1077 /* Could not assign a required resources 1078 * for this device, remove it */ 1079 pci_stop_and_remove_bus_device(dev); 1080 break; 1081 } 1082 } 1083 } 1084 } 1085 1086 /* Program resources in newly inserted bridge */ 1087 static int acpiphp_configure_bridge (acpi_handle handle) 1088 { 1089 struct pci_bus *bus; 1090 1091 if (acpi_is_root_bridge(handle)) { 1092 struct acpi_pci_root *root = acpi_pci_find_root(handle); 1093 bus = root->bus; 1094 } else { 1095 struct pci_dev *pdev = acpi_get_pci_dev(handle); 1096 bus = pdev->subordinate; 1097 pci_dev_put(pdev); 1098 } 1099 1100 pci_bus_size_bridges(bus); 1101 pci_bus_assign_resources(bus); 1102 acpiphp_sanitize_bus(bus); 1103 acpiphp_set_hpp_values(bus); 1104 pci_enable_bridges(bus); 1105 return 0; 1106 } 1107 1108 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1109 { 1110 struct acpi_device *device, *pdevice; 1111 acpi_handle phandle; 1112 1113 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1114 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1115 err("unexpected notification type %d\n", type); 1116 return; 1117 } 1118 1119 acpi_get_parent(handle, &phandle); 1120 if (acpi_bus_get_device(phandle, &pdevice)) { 1121 dbg("no parent device, assuming NULL\n"); 1122 pdevice = NULL; 1123 } 1124 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1125 err("cannot add bridge to acpi list\n"); 1126 return; 1127 } 1128 if (!acpiphp_configure_bridge(handle) && 1129 !acpi_bus_start(device)) 1130 add_bridge(handle); 1131 else 1132 err("cannot configure and start bridge\n"); 1133 1134 } 1135 1136 /* 1137 * ACPI event handlers 1138 */ 1139 1140 static acpi_status 1141 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1142 { 1143 int *count = (int *)context; 1144 struct acpiphp_bridge *bridge; 1145 1146 bridge = acpiphp_handle_to_bridge(handle); 1147 if (bridge) 1148 (*count)++; 1149 return AE_OK ; 1150 } 1151 1152 static acpi_status 1153 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1154 { 1155 struct acpiphp_bridge *bridge; 1156 char objname[64]; 1157 struct acpi_buffer buffer = { .length = sizeof(objname), 1158 .pointer = objname }; 1159 1160 bridge = acpiphp_handle_to_bridge(handle); 1161 if (bridge) { 1162 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1163 dbg("%s: re-enumerating slots under %s\n", 1164 __func__, objname); 1165 acpiphp_check_bridge(bridge); 1166 } 1167 return AE_OK ; 1168 } 1169 1170 struct acpiphp_hp_work { 1171 struct work_struct work; 1172 acpi_handle handle; 1173 u32 type; 1174 void *context; 1175 }; 1176 1177 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type, 1178 void *context, 1179 void (*func)(struct work_struct *work)) 1180 { 1181 struct acpiphp_hp_work *hp_work; 1182 int ret; 1183 1184 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); 1185 if (!hp_work) 1186 return; 1187 1188 hp_work->handle = handle; 1189 hp_work->type = type; 1190 hp_work->context = context; 1191 1192 INIT_WORK(&hp_work->work, func); 1193 ret = queue_work(kacpi_hotplug_wq, &hp_work->work); 1194 if (!ret) 1195 kfree(hp_work); 1196 } 1197 1198 static void _handle_hotplug_event_bridge(struct work_struct *work) 1199 { 1200 struct acpiphp_bridge *bridge; 1201 char objname[64]; 1202 struct acpi_buffer buffer = { .length = sizeof(objname), 1203 .pointer = objname }; 1204 struct acpi_device *device; 1205 int num_sub_bridges = 0; 1206 struct acpiphp_hp_work *hp_work; 1207 acpi_handle handle; 1208 u32 type; 1209 1210 hp_work = container_of(work, struct acpiphp_hp_work, work); 1211 handle = hp_work->handle; 1212 type = hp_work->type; 1213 1214 if (acpi_bus_get_device(handle, &device)) { 1215 /* This bridge must have just been physically inserted */ 1216 handle_bridge_insertion(handle, type); 1217 goto out; 1218 } 1219 1220 bridge = acpiphp_handle_to_bridge(handle); 1221 if (type == ACPI_NOTIFY_BUS_CHECK) { 1222 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1223 count_sub_bridges, NULL, &num_sub_bridges, NULL); 1224 } 1225 1226 if (!bridge && !num_sub_bridges) { 1227 err("cannot get bridge info\n"); 1228 goto out; 1229 } 1230 1231 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1232 1233 switch (type) { 1234 case ACPI_NOTIFY_BUS_CHECK: 1235 /* bus re-enumerate */ 1236 dbg("%s: Bus check notify on %s\n", __func__, objname); 1237 if (bridge) { 1238 dbg("%s: re-enumerating slots under %s\n", 1239 __func__, objname); 1240 acpiphp_check_bridge(bridge); 1241 } 1242 if (num_sub_bridges) 1243 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1244 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1245 break; 1246 1247 case ACPI_NOTIFY_DEVICE_CHECK: 1248 /* device check */ 1249 dbg("%s: Device check notify on %s\n", __func__, objname); 1250 acpiphp_check_bridge(bridge); 1251 break; 1252 1253 case ACPI_NOTIFY_DEVICE_WAKE: 1254 /* wake event */ 1255 dbg("%s: Device wake notify on %s\n", __func__, objname); 1256 break; 1257 1258 case ACPI_NOTIFY_EJECT_REQUEST: 1259 /* request device eject */ 1260 dbg("%s: Device eject notify on %s\n", __func__, objname); 1261 if ((bridge->type != BRIDGE_TYPE_HOST) && 1262 (bridge->flags & BRIDGE_HAS_EJ0)) { 1263 struct acpiphp_slot *slot; 1264 slot = bridge->func->slot; 1265 if (!acpiphp_disable_slot(slot)) 1266 acpiphp_eject_slot(slot); 1267 } 1268 break; 1269 1270 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1271 printk(KERN_ERR "Device %s cannot be configured due" 1272 " to a frequency mismatch\n", objname); 1273 break; 1274 1275 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1276 printk(KERN_ERR "Device %s cannot be configured due" 1277 " to a bus mode mismatch\n", objname); 1278 break; 1279 1280 case ACPI_NOTIFY_POWER_FAULT: 1281 printk(KERN_ERR "Device %s has suffered a power fault\n", 1282 objname); 1283 break; 1284 1285 default: 1286 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1287 break; 1288 } 1289 1290 out: 1291 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1292 } 1293 1294 /** 1295 * handle_hotplug_event_bridge - handle ACPI event on bridges 1296 * @handle: Notify()'ed acpi_handle 1297 * @type: Notify code 1298 * @context: pointer to acpiphp_bridge structure 1299 * 1300 * Handles ACPI event notification on {host,p2p} bridges. 1301 */ 1302 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, 1303 void *context) 1304 { 1305 /* 1306 * Currently the code adds all hotplug events to the kacpid_wq 1307 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1308 * The proper way to fix this is to reorganize the code so that 1309 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1310 * For now just re-add this work to the kacpi_hotplug_wq so we 1311 * don't deadlock on hotplug actions. 1312 */ 1313 alloc_acpiphp_hp_work(handle, type, context, 1314 _handle_hotplug_event_bridge); 1315 } 1316 1317 static void _handle_hotplug_event_func(struct work_struct *work) 1318 { 1319 struct acpiphp_func *func; 1320 char objname[64]; 1321 struct acpi_buffer buffer = { .length = sizeof(objname), 1322 .pointer = objname }; 1323 struct acpiphp_hp_work *hp_work; 1324 acpi_handle handle; 1325 u32 type; 1326 void *context; 1327 1328 hp_work = container_of(work, struct acpiphp_hp_work, work); 1329 handle = hp_work->handle; 1330 type = hp_work->type; 1331 context = hp_work->context; 1332 1333 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1334 1335 func = (struct acpiphp_func *)context; 1336 1337 switch (type) { 1338 case ACPI_NOTIFY_BUS_CHECK: 1339 /* bus re-enumerate */ 1340 dbg("%s: Bus check notify on %s\n", __func__, objname); 1341 acpiphp_enable_slot(func->slot); 1342 break; 1343 1344 case ACPI_NOTIFY_DEVICE_CHECK: 1345 /* device check : re-enumerate from parent bus */ 1346 dbg("%s: Device check notify on %s\n", __func__, objname); 1347 acpiphp_check_bridge(func->slot->bridge); 1348 break; 1349 1350 case ACPI_NOTIFY_DEVICE_WAKE: 1351 /* wake event */ 1352 dbg("%s: Device wake notify on %s\n", __func__, objname); 1353 break; 1354 1355 case ACPI_NOTIFY_EJECT_REQUEST: 1356 /* request device eject */ 1357 dbg("%s: Device eject notify on %s\n", __func__, objname); 1358 if (!(acpiphp_disable_slot(func->slot))) 1359 acpiphp_eject_slot(func->slot); 1360 break; 1361 1362 default: 1363 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1364 break; 1365 } 1366 1367 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1368 } 1369 1370 /** 1371 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1372 * @handle: Notify()'ed acpi_handle 1373 * @type: Notify code 1374 * @context: pointer to acpiphp_func structure 1375 * 1376 * Handles ACPI event notification on slots. 1377 */ 1378 static void handle_hotplug_event_func(acpi_handle handle, u32 type, 1379 void *context) 1380 { 1381 /* 1382 * Currently the code adds all hotplug events to the kacpid_wq 1383 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1384 * The proper way to fix this is to reorganize the code so that 1385 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1386 * For now just re-add this work to the kacpi_hotplug_wq so we 1387 * don't deadlock on hotplug actions. 1388 */ 1389 alloc_acpiphp_hp_work(handle, type, context, 1390 _handle_hotplug_event_func); 1391 } 1392 1393 static acpi_status 1394 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1395 { 1396 int *count = (int *)context; 1397 1398 if (!acpi_is_root_bridge(handle)) 1399 return AE_OK; 1400 1401 (*count)++; 1402 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1403 handle_hotplug_event_bridge, NULL); 1404 1405 return AE_OK ; 1406 } 1407 1408 static struct acpi_pci_driver acpi_pci_hp_driver = { 1409 .add = add_bridge, 1410 .remove = remove_bridge, 1411 }; 1412 1413 /** 1414 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1415 */ 1416 int __init acpiphp_glue_init(void) 1417 { 1418 int num = 0; 1419 1420 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1421 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); 1422 1423 if (num <= 0) 1424 return -1; 1425 else 1426 acpi_pci_register_driver(&acpi_pci_hp_driver); 1427 1428 return 0; 1429 } 1430 1431 1432 /** 1433 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1434 * 1435 * This function frees all data allocated in acpiphp_glue_init(). 1436 */ 1437 void acpiphp_glue_exit(void) 1438 { 1439 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1440 } 1441 1442 1443 /** 1444 * acpiphp_get_num_slots - count number of slots in a system 1445 */ 1446 int __init acpiphp_get_num_slots(void) 1447 { 1448 struct acpiphp_bridge *bridge; 1449 int num_slots = 0; 1450 1451 list_for_each_entry(bridge, &bridge_list, list) { 1452 dbg("Bus %04x:%02x has %d slot%s\n", 1453 pci_domain_nr(bridge->pci_bus), 1454 bridge->pci_bus->number, bridge->nr_slots, 1455 bridge->nr_slots == 1 ? "" : "s"); 1456 num_slots += bridge->nr_slots; 1457 } 1458 1459 dbg("Total %d slots\n", num_slots); 1460 return num_slots; 1461 } 1462 1463 1464 #if 0 1465 /** 1466 * acpiphp_for_each_slot - call function for each slot 1467 * @fn: callback function 1468 * @data: context to be passed to callback function 1469 */ 1470 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1471 { 1472 struct list_head *node; 1473 struct acpiphp_bridge *bridge; 1474 struct acpiphp_slot *slot; 1475 int retval = 0; 1476 1477 list_for_each (node, &bridge_list) { 1478 bridge = (struct acpiphp_bridge *)node; 1479 for (slot = bridge->slots; slot; slot = slot->next) { 1480 retval = fn(slot, data); 1481 if (!retval) 1482 goto err_exit; 1483 } 1484 } 1485 1486 err_exit: 1487 return retval; 1488 } 1489 #endif 1490 1491 1492 /** 1493 * acpiphp_enable_slot - power on slot 1494 * @slot: ACPI PHP slot 1495 */ 1496 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1497 { 1498 int retval; 1499 1500 mutex_lock(&slot->crit_sect); 1501 1502 /* wake up all functions */ 1503 retval = power_on_slot(slot); 1504 if (retval) 1505 goto err_exit; 1506 1507 if (get_slot_status(slot) == ACPI_STA_ALL) { 1508 /* configure all functions */ 1509 retval = enable_device(slot); 1510 if (retval) 1511 power_off_slot(slot); 1512 } else { 1513 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1514 power_off_slot(slot); 1515 } 1516 1517 err_exit: 1518 mutex_unlock(&slot->crit_sect); 1519 return retval; 1520 } 1521 1522 /** 1523 * acpiphp_disable_slot - power off slot 1524 * @slot: ACPI PHP slot 1525 */ 1526 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1527 { 1528 int retval = 0; 1529 1530 mutex_lock(&slot->crit_sect); 1531 1532 /* unconfigure all functions */ 1533 retval = disable_device(slot); 1534 if (retval) 1535 goto err_exit; 1536 1537 /* power off all functions */ 1538 retval = power_off_slot(slot); 1539 if (retval) 1540 goto err_exit; 1541 1542 err_exit: 1543 mutex_unlock(&slot->crit_sect); 1544 return retval; 1545 } 1546 1547 1548 /* 1549 * slot enabled: 1 1550 * slot disabled: 0 1551 */ 1552 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1553 { 1554 return (slot->flags & SLOT_POWEREDON); 1555 } 1556 1557 1558 /* 1559 * latch open: 1 1560 * latch closed: 0 1561 */ 1562 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1563 { 1564 unsigned int sta; 1565 1566 sta = get_slot_status(slot); 1567 1568 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1569 } 1570 1571 1572 /* 1573 * adapter presence : 1 1574 * absence : 0 1575 */ 1576 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1577 { 1578 unsigned int sta; 1579 1580 sta = get_slot_status(slot); 1581 1582 return (sta == 0) ? 0 : 1; 1583 } 1584