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 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 119 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 120 { 121 u32 reg32; 122 acpi_handle tmp; 123 struct acpi_pci_root *root; 124 125 /* Check whether the PCIe port supports native PCIe hotplug */ 126 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 127 return false; 128 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 129 return false; 130 131 /* 132 * Check whether native PCIe hotplug has been enabled for 133 * this PCIe hierarchy. 134 */ 135 tmp = acpi_find_root_bridge_handle(pdev); 136 if (!tmp) 137 return false; 138 root = acpi_pci_find_root(tmp); 139 if (!root) 140 return false; 141 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 142 return false; 143 144 return true; 145 } 146 147 /* callback routine to register each ACPI PCI slot object */ 148 static acpi_status 149 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 150 { 151 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 152 struct acpiphp_slot *slot; 153 struct acpiphp_func *newfunc; 154 acpi_handle tmp; 155 acpi_status status = AE_OK; 156 unsigned long long adr, sun; 157 int device, function, retval; 158 struct pci_bus *pbus = bridge->pci_bus; 159 struct pci_dev *pdev; 160 161 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) 162 return AE_OK; 163 164 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 165 if (ACPI_FAILURE(status)) { 166 warn("can't evaluate _ADR (%#x)\n", status); 167 return AE_OK; 168 } 169 170 device = (adr >> 16) & 0xffff; 171 function = adr & 0xffff; 172 173 pdev = pbus->self; 174 if (pdev && device_is_managed_by_native_pciehp(pdev)) 175 return AE_OK; 176 177 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 178 if (!newfunc) 179 return AE_NO_MEMORY; 180 181 INIT_LIST_HEAD(&newfunc->sibling); 182 newfunc->handle = handle; 183 newfunc->function = function; 184 185 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) 186 newfunc->flags = FUNC_HAS_EJ0; 187 188 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 189 newfunc->flags |= FUNC_HAS_STA; 190 191 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 192 newfunc->flags |= FUNC_HAS_PS0; 193 194 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 195 newfunc->flags |= FUNC_HAS_PS3; 196 197 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 198 newfunc->flags |= FUNC_HAS_DCK; 199 200 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 201 if (ACPI_FAILURE(status)) { 202 /* 203 * use the count of the number of slots we've found 204 * for the number of the slot 205 */ 206 sun = bridge->nr_slots+1; 207 } 208 209 /* search for objects that share the same slot */ 210 for (slot = bridge->slots; slot; slot = slot->next) 211 if (slot->device == device) { 212 if (slot->sun != sun) 213 warn("sibling found, but _SUN doesn't match!\n"); 214 break; 215 } 216 217 if (!slot) { 218 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 219 if (!slot) { 220 kfree(newfunc); 221 return AE_NO_MEMORY; 222 } 223 224 slot->bridge = bridge; 225 slot->device = device; 226 slot->sun = sun; 227 INIT_LIST_HEAD(&slot->funcs); 228 mutex_init(&slot->crit_sect); 229 230 slot->next = bridge->slots; 231 bridge->slots = slot; 232 233 bridge->nr_slots++; 234 235 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 236 slot->sun, pci_domain_nr(pbus), pbus->number, device); 237 retval = acpiphp_register_hotplug_slot(slot); 238 if (retval) { 239 if (retval == -EBUSY) 240 warn("Slot %llu already registered by another " 241 "hotplug driver\n", slot->sun); 242 else 243 warn("acpiphp_register_hotplug_slot failed " 244 "(err code = 0x%x)\n", retval); 245 goto err_exit; 246 } 247 } 248 249 newfunc->slot = slot; 250 list_add_tail(&newfunc->sibling, &slot->funcs); 251 252 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function)); 253 if (pdev) { 254 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 255 pci_dev_put(pdev); 256 } 257 258 if (is_dock_device(handle)) { 259 /* we don't want to call this device's _EJ0 260 * because we want the dock notify handler 261 * to call it after it calls _DCK 262 */ 263 newfunc->flags &= ~FUNC_HAS_EJ0; 264 if (register_hotplug_dock_device(handle, 265 &acpiphp_dock_ops, newfunc)) 266 dbg("failed to register dock device\n"); 267 268 /* we need to be notified when dock events happen 269 * outside of the hotplug operation, since we may 270 * need to do fixups before we can hotplug. 271 */ 272 newfunc->nb.notifier_call = post_dock_fixups; 273 if (register_dock_notifier(&newfunc->nb)) 274 dbg("failed to register a dock notifier"); 275 } 276 277 /* install notify handler */ 278 if (!(newfunc->flags & FUNC_HAS_DCK)) { 279 status = acpi_install_notify_handler(handle, 280 ACPI_SYSTEM_NOTIFY, 281 handle_hotplug_event_func, 282 newfunc); 283 284 if (ACPI_FAILURE(status)) 285 err("failed to register interrupt notify handler\n"); 286 } else 287 status = AE_OK; 288 289 return status; 290 291 err_exit: 292 bridge->nr_slots--; 293 bridge->slots = slot->next; 294 kfree(slot); 295 kfree(newfunc); 296 297 return AE_OK; 298 } 299 300 301 /* see if it's worth looking at this bridge */ 302 static int detect_ejectable_slots(acpi_handle handle) 303 { 304 int found = acpi_pci_detect_ejectable(handle); 305 if (!found) { 306 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 307 is_pci_dock_device, NULL, (void *)&found, NULL); 308 } 309 return found; 310 } 311 312 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 313 static void init_bridge_misc(struct acpiphp_bridge *bridge) 314 { 315 acpi_status status; 316 317 /* must be added to the list prior to calling register_slot */ 318 list_add(&bridge->list, &bridge_list); 319 320 /* register all slot objects under this bridge */ 321 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 322 register_slot, NULL, bridge, NULL); 323 if (ACPI_FAILURE(status)) { 324 list_del(&bridge->list); 325 return; 326 } 327 328 /* install notify handler */ 329 if (bridge->type != BRIDGE_TYPE_HOST) { 330 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 331 status = acpi_remove_notify_handler(bridge->func->handle, 332 ACPI_SYSTEM_NOTIFY, 333 handle_hotplug_event_func); 334 if (ACPI_FAILURE(status)) 335 err("failed to remove notify handler\n"); 336 } 337 status = acpi_install_notify_handler(bridge->handle, 338 ACPI_SYSTEM_NOTIFY, 339 handle_hotplug_event_bridge, 340 bridge); 341 342 if (ACPI_FAILURE(status)) { 343 err("failed to register interrupt notify handler\n"); 344 } 345 } 346 } 347 348 349 /* find acpiphp_func from acpiphp_bridge */ 350 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 351 { 352 struct acpiphp_bridge *bridge; 353 struct acpiphp_slot *slot; 354 struct acpiphp_func *func; 355 356 list_for_each_entry(bridge, &bridge_list, list) { 357 for (slot = bridge->slots; slot; slot = slot->next) { 358 list_for_each_entry(func, &slot->funcs, sibling) { 359 if (func->handle == handle) 360 return func; 361 } 362 } 363 } 364 365 return NULL; 366 } 367 368 369 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) 370 { 371 acpi_handle dummy_handle; 372 373 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 374 "_STA", &dummy_handle))) 375 bridge->flags |= BRIDGE_HAS_STA; 376 377 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 378 "_EJ0", &dummy_handle))) 379 bridge->flags |= BRIDGE_HAS_EJ0; 380 381 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 382 "_PS0", &dummy_handle))) 383 bridge->flags |= BRIDGE_HAS_PS0; 384 385 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, 386 "_PS3", &dummy_handle))) 387 bridge->flags |= BRIDGE_HAS_PS3; 388 389 /* is this ejectable p2p bridge? */ 390 if (bridge->flags & BRIDGE_HAS_EJ0) { 391 struct acpiphp_func *func; 392 393 dbg("found ejectable p2p bridge\n"); 394 395 /* make link between PCI bridge and PCI function */ 396 func = acpiphp_bridge_handle_to_function(bridge->handle); 397 if (!func) 398 return; 399 bridge->func = func; 400 func->bridge = bridge; 401 } 402 } 403 404 405 /* allocate and initialize host bridge data structure */ 406 static void add_host_bridge(struct acpi_pci_root *root) 407 { 408 struct acpiphp_bridge *bridge; 409 acpi_handle handle = root->device->handle; 410 411 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 412 if (bridge == NULL) 413 return; 414 415 bridge->type = BRIDGE_TYPE_HOST; 416 bridge->handle = handle; 417 418 bridge->pci_bus = root->bus; 419 420 init_bridge_misc(bridge); 421 } 422 423 424 /* allocate and initialize PCI-to-PCI bridge data structure */ 425 static void add_p2p_bridge(acpi_handle *handle) 426 { 427 struct acpiphp_bridge *bridge; 428 429 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 430 if (bridge == NULL) { 431 err("out of memory\n"); 432 return; 433 } 434 435 bridge->type = BRIDGE_TYPE_P2P; 436 bridge->handle = handle; 437 config_p2p_bridge_flags(bridge); 438 439 bridge->pci_dev = acpi_get_pci_dev(handle); 440 bridge->pci_bus = bridge->pci_dev->subordinate; 441 if (!bridge->pci_bus) { 442 err("This is not a PCI-to-PCI bridge!\n"); 443 goto err; 444 } 445 446 /* 447 * Grab a ref to the subordinate PCI bus in case the bus is 448 * removed via PCI core logical hotplug. The ref pins the bus 449 * (which we access during module unload). 450 */ 451 get_device(&bridge->pci_bus->dev); 452 453 init_bridge_misc(bridge); 454 return; 455 err: 456 pci_dev_put(bridge->pci_dev); 457 kfree(bridge); 458 return; 459 } 460 461 462 /* callback routine to find P2P bridges */ 463 static acpi_status 464 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 465 { 466 acpi_status status; 467 struct pci_dev *dev; 468 469 dev = acpi_get_pci_dev(handle); 470 if (!dev || !dev->subordinate) 471 goto out; 472 473 /* check if this bridge has ejectable slots */ 474 if ((detect_ejectable_slots(handle) > 0)) { 475 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 476 add_p2p_bridge(handle); 477 } 478 479 /* search P2P bridges under this p2p bridge */ 480 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 481 find_p2p_bridge, NULL, NULL, NULL); 482 if (ACPI_FAILURE(status)) 483 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 484 485 out: 486 pci_dev_put(dev); 487 return AE_OK; 488 } 489 490 491 /* find hot-pluggable slots, and then find P2P bridge */ 492 static int add_bridge(struct acpi_pci_root *root) 493 { 494 acpi_status status; 495 unsigned long long tmp; 496 acpi_handle dummy_handle; 497 acpi_handle handle = root->device->handle; 498 499 /* if the bridge doesn't have _STA, we assume it is always there */ 500 status = acpi_get_handle(handle, "_STA", &dummy_handle); 501 if (ACPI_SUCCESS(status)) { 502 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 503 if (ACPI_FAILURE(status)) { 504 dbg("%s: _STA evaluation failure\n", __func__); 505 return 0; 506 } 507 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 508 /* don't register this object */ 509 return 0; 510 } 511 512 /* check if this bridge has ejectable slots */ 513 if (detect_ejectable_slots(handle) > 0) { 514 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 515 add_host_bridge(root); 516 } 517 518 /* search P2P bridges under this host bridge */ 519 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 520 find_p2p_bridge, NULL, NULL, NULL); 521 522 if (ACPI_FAILURE(status)) 523 warn("find_p2p_bridge failed (error code = 0x%x)\n", status); 524 525 return 0; 526 } 527 528 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 529 { 530 struct acpiphp_bridge *bridge; 531 532 list_for_each_entry(bridge, &bridge_list, list) 533 if (bridge->handle == handle) 534 return bridge; 535 536 return NULL; 537 } 538 539 static void cleanup_bridge(struct acpiphp_bridge *bridge) 540 { 541 struct acpiphp_slot *slot, *next; 542 struct acpiphp_func *func, *tmp; 543 acpi_status status; 544 acpi_handle handle = bridge->handle; 545 546 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 547 handle_hotplug_event_bridge); 548 if (ACPI_FAILURE(status)) 549 err("failed to remove notify handler\n"); 550 551 if ((bridge->type != BRIDGE_TYPE_HOST) && 552 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 553 status = acpi_install_notify_handler(bridge->func->handle, 554 ACPI_SYSTEM_NOTIFY, 555 handle_hotplug_event_func, 556 bridge->func); 557 if (ACPI_FAILURE(status)) 558 err("failed to install interrupt notify handler\n"); 559 } 560 561 slot = bridge->slots; 562 while (slot) { 563 next = slot->next; 564 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) { 565 if (is_dock_device(func->handle)) { 566 unregister_hotplug_dock_device(func->handle); 567 unregister_dock_notifier(&func->nb); 568 } 569 if (!(func->flags & FUNC_HAS_DCK)) { 570 status = acpi_remove_notify_handler(func->handle, 571 ACPI_SYSTEM_NOTIFY, 572 handle_hotplug_event_func); 573 if (ACPI_FAILURE(status)) 574 err("failed to remove notify handler\n"); 575 } 576 list_del(&func->sibling); 577 kfree(func); 578 } 579 acpiphp_unregister_hotplug_slot(slot); 580 list_del(&slot->funcs); 581 kfree(slot); 582 slot = next; 583 } 584 585 /* 586 * Only P2P bridges have a pci_dev 587 */ 588 if (bridge->pci_dev) 589 put_device(&bridge->pci_bus->dev); 590 591 pci_dev_put(bridge->pci_dev); 592 list_del(&bridge->list); 593 kfree(bridge); 594 } 595 596 static acpi_status 597 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 598 { 599 struct acpiphp_bridge *bridge; 600 601 /* cleanup p2p bridges under this P2P bridge 602 in a depth-first manner */ 603 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 604 cleanup_p2p_bridge, NULL, NULL, NULL); 605 606 bridge = acpiphp_handle_to_bridge(handle); 607 if (bridge) 608 cleanup_bridge(bridge); 609 610 return AE_OK; 611 } 612 613 static void remove_bridge(struct acpi_pci_root *root) 614 { 615 struct acpiphp_bridge *bridge; 616 acpi_handle handle = root->device->handle; 617 618 /* cleanup p2p bridges under this host bridge 619 in a depth-first manner */ 620 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 621 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL); 622 623 /* 624 * On root bridges with hotplug slots directly underneath (ie, 625 * no p2p bridge between), we call cleanup_bridge(). 626 * 627 * The else clause cleans up root bridges that either had no 628 * hotplug slots at all, or had a p2p bridge underneath. 629 */ 630 bridge = acpiphp_handle_to_bridge(handle); 631 if (bridge) 632 cleanup_bridge(bridge); 633 else 634 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 635 handle_hotplug_event_bridge); 636 } 637 638 static int power_on_slot(struct acpiphp_slot *slot) 639 { 640 acpi_status status; 641 struct acpiphp_func *func; 642 int retval = 0; 643 644 /* if already enabled, just skip */ 645 if (slot->flags & SLOT_POWEREDON) 646 goto err_exit; 647 648 list_for_each_entry(func, &slot->funcs, sibling) { 649 if (func->flags & FUNC_HAS_PS0) { 650 dbg("%s: executing _PS0\n", __func__); 651 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 652 if (ACPI_FAILURE(status)) { 653 warn("%s: _PS0 failed\n", __func__); 654 retval = -1; 655 goto err_exit; 656 } else 657 break; 658 } 659 } 660 661 /* TBD: evaluate _STA to check if the slot is enabled */ 662 663 slot->flags |= SLOT_POWEREDON; 664 665 err_exit: 666 return retval; 667 } 668 669 670 static int power_off_slot(struct acpiphp_slot *slot) 671 { 672 acpi_status status; 673 struct acpiphp_func *func; 674 675 int retval = 0; 676 677 /* if already disabled, just skip */ 678 if ((slot->flags & SLOT_POWEREDON) == 0) 679 goto err_exit; 680 681 list_for_each_entry(func, &slot->funcs, sibling) { 682 if (func->flags & FUNC_HAS_PS3) { 683 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 684 if (ACPI_FAILURE(status)) { 685 warn("%s: _PS3 failed\n", __func__); 686 retval = -1; 687 goto err_exit; 688 } else 689 break; 690 } 691 } 692 693 /* TBD: evaluate _STA to check if the slot is disabled */ 694 695 slot->flags &= (~SLOT_POWEREDON); 696 697 err_exit: 698 return retval; 699 } 700 701 702 703 /** 704 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 705 * @bus: bus to start search with 706 */ 707 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 708 { 709 struct list_head *tmp; 710 unsigned char max, n; 711 712 /* 713 * pci_bus_max_busnr will return the highest 714 * reserved busnr for all these children. 715 * that is equivalent to the bus->subordinate 716 * value. We don't want to use the parent's 717 * bus->subordinate value because it could have 718 * padding in it. 719 */ 720 max = bus->busn_res.start; 721 722 list_for_each(tmp, &bus->children) { 723 n = pci_bus_max_busnr(pci_bus_b(tmp)); 724 if (n > max) 725 max = n; 726 } 727 return max; 728 } 729 730 731 /** 732 * acpiphp_bus_add - add a new bus to acpi subsystem 733 * @func: acpiphp_func of the bridge 734 */ 735 static int acpiphp_bus_add(struct acpiphp_func *func) 736 { 737 struct acpi_device *device; 738 int ret_val; 739 740 if (!acpi_bus_get_device(func->handle, &device)) { 741 dbg("bus exists... trim\n"); 742 /* this shouldn't be in here, so remove 743 * the bus then re-add it... 744 */ 745 ret_val = acpi_bus_trim(device, 1); 746 dbg("acpi_bus_trim return %x\n", ret_val); 747 } 748 749 ret_val = acpi_bus_add(func->handle, &device); 750 if (ret_val) { 751 dbg("error adding bus, %x\n", 752 -ret_val); 753 goto acpiphp_bus_add_out; 754 } 755 756 acpiphp_bus_add_out: 757 return ret_val; 758 } 759 760 761 /** 762 * acpiphp_bus_trim - trim a bus from acpi subsystem 763 * @handle: handle to acpi namespace 764 */ 765 static int acpiphp_bus_trim(acpi_handle handle) 766 { 767 struct acpi_device *device; 768 int retval; 769 770 retval = acpi_bus_get_device(handle, &device); 771 if (retval) { 772 dbg("acpi_device not found\n"); 773 return retval; 774 } 775 776 retval = acpi_bus_trim(device, 1); 777 if (retval) 778 err("cannot remove from acpi list\n"); 779 780 return retval; 781 } 782 783 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 784 { 785 struct acpiphp_func *func; 786 union acpi_object params[2]; 787 struct acpi_object_list arg_list; 788 789 list_for_each_entry(func, &slot->funcs, sibling) { 790 arg_list.count = 2; 791 arg_list.pointer = params; 792 params[0].type = ACPI_TYPE_INTEGER; 793 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 794 params[1].type = ACPI_TYPE_INTEGER; 795 params[1].integer.value = 1; 796 /* _REG is optional, we don't care about if there is failure */ 797 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL); 798 } 799 } 800 801 /** 802 * enable_device - enable, configure a slot 803 * @slot: slot to be enabled 804 * 805 * This function should be called per *physical slot*, 806 * not per each slot object in ACPI namespace. 807 */ 808 static int __ref enable_device(struct acpiphp_slot *slot) 809 { 810 struct pci_dev *dev; 811 struct pci_bus *bus = slot->bridge->pci_bus; 812 struct acpiphp_func *func; 813 int retval = 0; 814 int num, max, pass; 815 acpi_status status; 816 817 if (slot->flags & SLOT_ENABLED) 818 goto err_exit; 819 820 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 821 if (num == 0) { 822 /* Maybe only part of funcs are added. */ 823 dbg("No new device found\n"); 824 goto err_exit; 825 } 826 827 max = acpiphp_max_busnr(bus); 828 for (pass = 0; pass < 2; pass++) { 829 list_for_each_entry(dev, &bus->devices, bus_list) { 830 if (PCI_SLOT(dev->devfn) != slot->device) 831 continue; 832 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 833 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 834 max = pci_scan_bridge(bus, dev, max, pass); 835 if (pass && dev->subordinate) 836 pci_bus_size_bridges(dev->subordinate); 837 } 838 } 839 } 840 841 list_for_each_entry(func, &slot->funcs, sibling) 842 acpiphp_bus_add(func); 843 844 pci_bus_assign_resources(bus); 845 acpiphp_sanitize_bus(bus); 846 acpiphp_set_hpp_values(bus); 847 acpiphp_set_acpi_region(slot); 848 pci_enable_bridges(bus); 849 850 list_for_each_entry(dev, &bus->devices, bus_list) { 851 /* Assume that newly added devices are powered on already. */ 852 if (!dev->is_added) 853 dev->current_state = PCI_D0; 854 } 855 856 pci_bus_add_devices(bus); 857 858 slot->flags |= SLOT_ENABLED; 859 list_for_each_entry(func, &slot->funcs, sibling) { 860 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 861 func->function)); 862 if (!dev) { 863 /* Do not set SLOT_ENABLED flag if some funcs 864 are not added. */ 865 slot->flags &= (~SLOT_ENABLED); 866 continue; 867 } 868 869 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 870 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) { 871 pci_dev_put(dev); 872 continue; 873 } 874 875 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 876 if (ACPI_FAILURE(status)) 877 warn("find_p2p_bridge failed (error code = 0x%x)\n", 878 status); 879 pci_dev_put(dev); 880 } 881 882 883 err_exit: 884 return retval; 885 } 886 887 /* return first device in slot, acquiring a reference on it */ 888 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 889 { 890 struct pci_bus *bus = slot->bridge->pci_bus; 891 struct pci_dev *dev; 892 struct pci_dev *ret = NULL; 893 894 down_read(&pci_bus_sem); 895 list_for_each_entry(dev, &bus->devices, bus_list) 896 if (PCI_SLOT(dev->devfn) == slot->device) { 897 ret = pci_dev_get(dev); 898 break; 899 } 900 up_read(&pci_bus_sem); 901 902 return ret; 903 } 904 905 /** 906 * disable_device - disable a slot 907 * @slot: ACPI PHP slot 908 */ 909 static int disable_device(struct acpiphp_slot *slot) 910 { 911 struct acpiphp_func *func; 912 struct pci_dev *pdev; 913 struct pci_bus *bus = slot->bridge->pci_bus; 914 915 /* The slot will be enabled when func 0 is added, so check 916 func 0 before disable the slot. */ 917 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 918 if (!pdev) 919 goto err_exit; 920 pci_dev_put(pdev); 921 922 list_for_each_entry(func, &slot->funcs, sibling) { 923 if (func->bridge) { 924 /* cleanup p2p bridges under this P2P bridge */ 925 cleanup_p2p_bridge(func->bridge->handle, 926 (u32)1, NULL, NULL); 927 func->bridge = NULL; 928 } 929 } 930 931 /* 932 * enable_device() enumerates all functions in this device via 933 * pci_scan_slot(), whether they have associated ACPI hotplug 934 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 935 * here. 936 */ 937 while ((pdev = dev_in_slot(slot))) { 938 pci_stop_and_remove_bus_device(pdev); 939 pci_dev_put(pdev); 940 } 941 942 list_for_each_entry(func, &slot->funcs, sibling) { 943 acpiphp_bus_trim(func->handle); 944 } 945 946 slot->flags &= (~SLOT_ENABLED); 947 948 err_exit: 949 return 0; 950 } 951 952 953 /** 954 * get_slot_status - get ACPI slot status 955 * @slot: ACPI PHP slot 956 * 957 * If a slot has _STA for each function and if any one of them 958 * returned non-zero status, return it. 959 * 960 * If a slot doesn't have _STA and if any one of its functions' 961 * configuration space is configured, return 0x0f as a _STA. 962 * 963 * Otherwise return 0. 964 */ 965 static unsigned int get_slot_status(struct acpiphp_slot *slot) 966 { 967 acpi_status status; 968 unsigned long long sta = 0; 969 u32 dvid; 970 struct acpiphp_func *func; 971 972 list_for_each_entry(func, &slot->funcs, sibling) { 973 if (func->flags & FUNC_HAS_STA) { 974 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 975 if (ACPI_SUCCESS(status) && sta) 976 break; 977 } else { 978 pci_bus_read_config_dword(slot->bridge->pci_bus, 979 PCI_DEVFN(slot->device, 980 func->function), 981 PCI_VENDOR_ID, &dvid); 982 if (dvid != 0xffffffff) { 983 sta = ACPI_STA_ALL; 984 break; 985 } 986 } 987 } 988 989 return (unsigned int)sta; 990 } 991 992 /** 993 * acpiphp_eject_slot - physically eject the slot 994 * @slot: ACPI PHP slot 995 */ 996 int acpiphp_eject_slot(struct acpiphp_slot *slot) 997 { 998 acpi_status status; 999 struct acpiphp_func *func; 1000 struct acpi_object_list arg_list; 1001 union acpi_object arg; 1002 1003 list_for_each_entry(func, &slot->funcs, sibling) { 1004 /* We don't want to call _EJ0 on non-existing functions. */ 1005 if ((func->flags & FUNC_HAS_EJ0)) { 1006 /* _EJ0 method take one argument */ 1007 arg_list.count = 1; 1008 arg_list.pointer = &arg; 1009 arg.type = ACPI_TYPE_INTEGER; 1010 arg.integer.value = 1; 1011 1012 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1013 if (ACPI_FAILURE(status)) { 1014 warn("%s: _EJ0 failed\n", __func__); 1015 return -1; 1016 } else 1017 break; 1018 } 1019 } 1020 return 0; 1021 } 1022 1023 /** 1024 * acpiphp_check_bridge - re-enumerate devices 1025 * @bridge: where to begin re-enumeration 1026 * 1027 * Iterate over all slots under this bridge and make sure that if a 1028 * card is present they are enabled, and if not they are disabled. 1029 */ 1030 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1031 { 1032 struct acpiphp_slot *slot; 1033 int retval = 0; 1034 int enabled, disabled; 1035 1036 enabled = disabled = 0; 1037 1038 for (slot = bridge->slots; slot; slot = slot->next) { 1039 unsigned int status = get_slot_status(slot); 1040 if (slot->flags & SLOT_ENABLED) { 1041 if (status == ACPI_STA_ALL) 1042 continue; 1043 retval = acpiphp_disable_slot(slot); 1044 if (retval) { 1045 err("Error occurred in disabling\n"); 1046 goto err_exit; 1047 } else { 1048 acpiphp_eject_slot(slot); 1049 } 1050 disabled++; 1051 } else { 1052 if (status != ACPI_STA_ALL) 1053 continue; 1054 retval = acpiphp_enable_slot(slot); 1055 if (retval) { 1056 err("Error occurred in enabling\n"); 1057 goto err_exit; 1058 } 1059 enabled++; 1060 } 1061 } 1062 1063 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 1064 1065 err_exit: 1066 return retval; 1067 } 1068 1069 static void acpiphp_set_hpp_values(struct pci_bus *bus) 1070 { 1071 struct pci_dev *dev; 1072 1073 list_for_each_entry(dev, &bus->devices, bus_list) 1074 pci_configure_slot(dev); 1075 } 1076 1077 /* 1078 * Remove devices for which we could not assign resources, call 1079 * arch specific code to fix-up the bus 1080 */ 1081 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1082 { 1083 struct pci_dev *dev; 1084 int i; 1085 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1086 1087 list_for_each_entry(dev, &bus->devices, bus_list) { 1088 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1089 struct resource *res = &dev->resource[i]; 1090 if ((res->flags & type_mask) && !res->start && 1091 res->end) { 1092 /* Could not assign a required resources 1093 * for this device, remove it */ 1094 pci_stop_and_remove_bus_device(dev); 1095 break; 1096 } 1097 } 1098 } 1099 } 1100 1101 /* Program resources in newly inserted bridge */ 1102 static int acpiphp_configure_bridge (acpi_handle handle) 1103 { 1104 struct pci_bus *bus; 1105 1106 if (acpi_is_root_bridge(handle)) { 1107 struct acpi_pci_root *root = acpi_pci_find_root(handle); 1108 bus = root->bus; 1109 } else { 1110 struct pci_dev *pdev = acpi_get_pci_dev(handle); 1111 bus = pdev->subordinate; 1112 pci_dev_put(pdev); 1113 } 1114 1115 pci_bus_size_bridges(bus); 1116 pci_bus_assign_resources(bus); 1117 acpiphp_sanitize_bus(bus); 1118 acpiphp_set_hpp_values(bus); 1119 pci_enable_bridges(bus); 1120 return 0; 1121 } 1122 1123 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1124 { 1125 struct acpi_device *device; 1126 1127 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1128 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1129 err("unexpected notification type %d\n", type); 1130 return; 1131 } 1132 1133 if (acpi_bus_add(handle, &device)) { 1134 err("cannot add bridge to acpi list\n"); 1135 return; 1136 } 1137 if (!acpiphp_configure_bridge(handle)) 1138 add_bridge(handle); 1139 else 1140 err("cannot configure and start bridge\n"); 1141 1142 } 1143 1144 /* 1145 * ACPI event handlers 1146 */ 1147 1148 static acpi_status 1149 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1150 { 1151 int *count = (int *)context; 1152 struct acpiphp_bridge *bridge; 1153 1154 bridge = acpiphp_handle_to_bridge(handle); 1155 if (bridge) 1156 (*count)++; 1157 return AE_OK ; 1158 } 1159 1160 static acpi_status 1161 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1162 { 1163 struct acpiphp_bridge *bridge; 1164 char objname[64]; 1165 struct acpi_buffer buffer = { .length = sizeof(objname), 1166 .pointer = objname }; 1167 1168 bridge = acpiphp_handle_to_bridge(handle); 1169 if (bridge) { 1170 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1171 dbg("%s: re-enumerating slots under %s\n", 1172 __func__, objname); 1173 acpiphp_check_bridge(bridge); 1174 } 1175 return AE_OK ; 1176 } 1177 1178 struct acpiphp_hp_work { 1179 struct work_struct work; 1180 acpi_handle handle; 1181 u32 type; 1182 void *context; 1183 }; 1184 1185 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type, 1186 void *context, 1187 void (*func)(struct work_struct *work)) 1188 { 1189 struct acpiphp_hp_work *hp_work; 1190 int ret; 1191 1192 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); 1193 if (!hp_work) 1194 return; 1195 1196 hp_work->handle = handle; 1197 hp_work->type = type; 1198 hp_work->context = context; 1199 1200 INIT_WORK(&hp_work->work, func); 1201 ret = queue_work(kacpi_hotplug_wq, &hp_work->work); 1202 if (!ret) 1203 kfree(hp_work); 1204 } 1205 1206 static void _handle_hotplug_event_bridge(struct work_struct *work) 1207 { 1208 struct acpiphp_bridge *bridge; 1209 char objname[64]; 1210 struct acpi_buffer buffer = { .length = sizeof(objname), 1211 .pointer = objname }; 1212 struct acpi_device *device; 1213 int num_sub_bridges = 0; 1214 struct acpiphp_hp_work *hp_work; 1215 acpi_handle handle; 1216 u32 type; 1217 1218 hp_work = container_of(work, struct acpiphp_hp_work, work); 1219 handle = hp_work->handle; 1220 type = hp_work->type; 1221 1222 if (acpi_bus_get_device(handle, &device)) { 1223 /* This bridge must have just been physically inserted */ 1224 handle_bridge_insertion(handle, type); 1225 goto out; 1226 } 1227 1228 bridge = acpiphp_handle_to_bridge(handle); 1229 if (type == ACPI_NOTIFY_BUS_CHECK) { 1230 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1231 count_sub_bridges, NULL, &num_sub_bridges, NULL); 1232 } 1233 1234 if (!bridge && !num_sub_bridges) { 1235 err("cannot get bridge info\n"); 1236 goto out; 1237 } 1238 1239 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1240 1241 switch (type) { 1242 case ACPI_NOTIFY_BUS_CHECK: 1243 /* bus re-enumerate */ 1244 dbg("%s: Bus check notify on %s\n", __func__, objname); 1245 if (bridge) { 1246 dbg("%s: re-enumerating slots under %s\n", 1247 __func__, objname); 1248 acpiphp_check_bridge(bridge); 1249 } 1250 if (num_sub_bridges) 1251 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1252 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1253 break; 1254 1255 case ACPI_NOTIFY_DEVICE_CHECK: 1256 /* device check */ 1257 dbg("%s: Device check notify on %s\n", __func__, objname); 1258 acpiphp_check_bridge(bridge); 1259 break; 1260 1261 case ACPI_NOTIFY_DEVICE_WAKE: 1262 /* wake event */ 1263 dbg("%s: Device wake notify on %s\n", __func__, objname); 1264 break; 1265 1266 case ACPI_NOTIFY_EJECT_REQUEST: 1267 /* request device eject */ 1268 dbg("%s: Device eject notify on %s\n", __func__, objname); 1269 if ((bridge->type != BRIDGE_TYPE_HOST) && 1270 (bridge->flags & BRIDGE_HAS_EJ0)) { 1271 struct acpiphp_slot *slot; 1272 slot = bridge->func->slot; 1273 if (!acpiphp_disable_slot(slot)) 1274 acpiphp_eject_slot(slot); 1275 } 1276 break; 1277 1278 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1279 printk(KERN_ERR "Device %s cannot be configured due" 1280 " to a frequency mismatch\n", objname); 1281 break; 1282 1283 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1284 printk(KERN_ERR "Device %s cannot be configured due" 1285 " to a bus mode mismatch\n", objname); 1286 break; 1287 1288 case ACPI_NOTIFY_POWER_FAULT: 1289 printk(KERN_ERR "Device %s has suffered a power fault\n", 1290 objname); 1291 break; 1292 1293 default: 1294 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1295 break; 1296 } 1297 1298 out: 1299 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1300 } 1301 1302 /** 1303 * handle_hotplug_event_bridge - handle ACPI event on bridges 1304 * @handle: Notify()'ed acpi_handle 1305 * @type: Notify code 1306 * @context: pointer to acpiphp_bridge structure 1307 * 1308 * Handles ACPI event notification on {host,p2p} bridges. 1309 */ 1310 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, 1311 void *context) 1312 { 1313 /* 1314 * Currently the code adds all hotplug events to the kacpid_wq 1315 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1316 * The proper way to fix this is to reorganize the code so that 1317 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1318 * For now just re-add this work to the kacpi_hotplug_wq so we 1319 * don't deadlock on hotplug actions. 1320 */ 1321 alloc_acpiphp_hp_work(handle, type, context, 1322 _handle_hotplug_event_bridge); 1323 } 1324 1325 static void _handle_hotplug_event_func(struct work_struct *work) 1326 { 1327 struct acpiphp_func *func; 1328 char objname[64]; 1329 struct acpi_buffer buffer = { .length = sizeof(objname), 1330 .pointer = objname }; 1331 struct acpiphp_hp_work *hp_work; 1332 acpi_handle handle; 1333 u32 type; 1334 void *context; 1335 1336 hp_work = container_of(work, struct acpiphp_hp_work, work); 1337 handle = hp_work->handle; 1338 type = hp_work->type; 1339 context = hp_work->context; 1340 1341 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1342 1343 func = (struct acpiphp_func *)context; 1344 1345 switch (type) { 1346 case ACPI_NOTIFY_BUS_CHECK: 1347 /* bus re-enumerate */ 1348 dbg("%s: Bus check notify on %s\n", __func__, objname); 1349 acpiphp_enable_slot(func->slot); 1350 break; 1351 1352 case ACPI_NOTIFY_DEVICE_CHECK: 1353 /* device check : re-enumerate from parent bus */ 1354 dbg("%s: Device check notify on %s\n", __func__, objname); 1355 acpiphp_check_bridge(func->slot->bridge); 1356 break; 1357 1358 case ACPI_NOTIFY_DEVICE_WAKE: 1359 /* wake event */ 1360 dbg("%s: Device wake notify on %s\n", __func__, objname); 1361 break; 1362 1363 case ACPI_NOTIFY_EJECT_REQUEST: 1364 /* request device eject */ 1365 dbg("%s: Device eject notify on %s\n", __func__, objname); 1366 if (!(acpiphp_disable_slot(func->slot))) 1367 acpiphp_eject_slot(func->slot); 1368 break; 1369 1370 default: 1371 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1372 break; 1373 } 1374 1375 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1376 } 1377 1378 /** 1379 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1380 * @handle: Notify()'ed acpi_handle 1381 * @type: Notify code 1382 * @context: pointer to acpiphp_func structure 1383 * 1384 * Handles ACPI event notification on slots. 1385 */ 1386 static void handle_hotplug_event_func(acpi_handle handle, u32 type, 1387 void *context) 1388 { 1389 /* 1390 * Currently the code adds all hotplug events to the kacpid_wq 1391 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1392 * The proper way to fix this is to reorganize the code so that 1393 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1394 * For now just re-add this work to the kacpi_hotplug_wq so we 1395 * don't deadlock on hotplug actions. 1396 */ 1397 alloc_acpiphp_hp_work(handle, type, context, 1398 _handle_hotplug_event_func); 1399 } 1400 1401 static acpi_status 1402 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1403 { 1404 int *count = (int *)context; 1405 1406 if (!acpi_is_root_bridge(handle)) 1407 return AE_OK; 1408 1409 (*count)++; 1410 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1411 handle_hotplug_event_bridge, NULL); 1412 1413 return AE_OK ; 1414 } 1415 1416 static struct acpi_pci_driver acpi_pci_hp_driver = { 1417 .add = add_bridge, 1418 .remove = remove_bridge, 1419 }; 1420 1421 /** 1422 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1423 */ 1424 int __init acpiphp_glue_init(void) 1425 { 1426 int num = 0; 1427 1428 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1429 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); 1430 1431 if (num <= 0) 1432 return -1; 1433 else 1434 acpi_pci_register_driver(&acpi_pci_hp_driver); 1435 1436 return 0; 1437 } 1438 1439 1440 /** 1441 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1442 * 1443 * This function frees all data allocated in acpiphp_glue_init(). 1444 */ 1445 void acpiphp_glue_exit(void) 1446 { 1447 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1448 } 1449 1450 1451 /** 1452 * acpiphp_get_num_slots - count number of slots in a system 1453 */ 1454 int __init acpiphp_get_num_slots(void) 1455 { 1456 struct acpiphp_bridge *bridge; 1457 int num_slots = 0; 1458 1459 list_for_each_entry(bridge, &bridge_list, list) { 1460 dbg("Bus %04x:%02x has %d slot%s\n", 1461 pci_domain_nr(bridge->pci_bus), 1462 bridge->pci_bus->number, bridge->nr_slots, 1463 bridge->nr_slots == 1 ? "" : "s"); 1464 num_slots += bridge->nr_slots; 1465 } 1466 1467 dbg("Total %d slots\n", num_slots); 1468 return num_slots; 1469 } 1470 1471 1472 /** 1473 * acpiphp_enable_slot - power on slot 1474 * @slot: ACPI PHP slot 1475 */ 1476 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1477 { 1478 int retval; 1479 1480 mutex_lock(&slot->crit_sect); 1481 1482 /* wake up all functions */ 1483 retval = power_on_slot(slot); 1484 if (retval) 1485 goto err_exit; 1486 1487 if (get_slot_status(slot) == ACPI_STA_ALL) { 1488 /* configure all functions */ 1489 retval = enable_device(slot); 1490 if (retval) 1491 power_off_slot(slot); 1492 } else { 1493 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1494 power_off_slot(slot); 1495 } 1496 1497 err_exit: 1498 mutex_unlock(&slot->crit_sect); 1499 return retval; 1500 } 1501 1502 /** 1503 * acpiphp_disable_slot - power off slot 1504 * @slot: ACPI PHP slot 1505 */ 1506 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1507 { 1508 int retval = 0; 1509 1510 mutex_lock(&slot->crit_sect); 1511 1512 /* unconfigure all functions */ 1513 retval = disable_device(slot); 1514 if (retval) 1515 goto err_exit; 1516 1517 /* power off all functions */ 1518 retval = power_off_slot(slot); 1519 if (retval) 1520 goto err_exit; 1521 1522 err_exit: 1523 mutex_unlock(&slot->crit_sect); 1524 return retval; 1525 } 1526 1527 1528 /* 1529 * slot enabled: 1 1530 * slot disabled: 0 1531 */ 1532 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1533 { 1534 return (slot->flags & SLOT_POWEREDON); 1535 } 1536 1537 1538 /* 1539 * latch open: 1 1540 * latch closed: 0 1541 */ 1542 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1543 { 1544 unsigned int sta; 1545 1546 sta = get_slot_status(slot); 1547 1548 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1549 } 1550 1551 1552 /* 1553 * adapter presence : 1 1554 * absence : 0 1555 */ 1556 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1557 { 1558 unsigned int sta; 1559 1560 sta = get_slot_status(slot); 1561 1562 return (sta == 0) ? 0 : 1; 1563 } 1564