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 acpi_handle phandle; 738 struct acpi_device *device, *pdevice; 739 int ret_val; 740 741 acpi_get_parent(func->handle, &phandle); 742 if (acpi_bus_get_device(phandle, &pdevice)) { 743 dbg("no parent device, assuming NULL\n"); 744 pdevice = NULL; 745 } 746 if (!acpi_bus_get_device(func->handle, &device)) { 747 dbg("bus exists... trim\n"); 748 /* this shouldn't be in here, so remove 749 * the bus then re-add it... 750 */ 751 ret_val = acpi_bus_trim(device, 1); 752 dbg("acpi_bus_trim return %x\n", ret_val); 753 } 754 755 ret_val = acpi_bus_add(&device, pdevice, func->handle, 756 ACPI_BUS_TYPE_DEVICE); 757 if (ret_val) { 758 dbg("error adding bus, %x\n", 759 -ret_val); 760 goto acpiphp_bus_add_out; 761 } 762 763 acpiphp_bus_add_out: 764 return ret_val; 765 } 766 767 768 /** 769 * acpiphp_bus_trim - trim a bus from acpi subsystem 770 * @handle: handle to acpi namespace 771 */ 772 static int acpiphp_bus_trim(acpi_handle handle) 773 { 774 struct acpi_device *device; 775 int retval; 776 777 retval = acpi_bus_get_device(handle, &device); 778 if (retval) { 779 dbg("acpi_device not found\n"); 780 return retval; 781 } 782 783 retval = acpi_bus_trim(device, 1); 784 if (retval) 785 err("cannot remove from acpi list\n"); 786 787 return retval; 788 } 789 790 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 791 { 792 struct acpiphp_func *func; 793 union acpi_object params[2]; 794 struct acpi_object_list arg_list; 795 796 list_for_each_entry(func, &slot->funcs, sibling) { 797 arg_list.count = 2; 798 arg_list.pointer = params; 799 params[0].type = ACPI_TYPE_INTEGER; 800 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 801 params[1].type = ACPI_TYPE_INTEGER; 802 params[1].integer.value = 1; 803 /* _REG is optional, we don't care about if there is failure */ 804 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL); 805 } 806 } 807 808 /** 809 * enable_device - enable, configure a slot 810 * @slot: slot to be enabled 811 * 812 * This function should be called per *physical slot*, 813 * not per each slot object in ACPI namespace. 814 */ 815 static int __ref enable_device(struct acpiphp_slot *slot) 816 { 817 struct pci_dev *dev; 818 struct pci_bus *bus = slot->bridge->pci_bus; 819 struct acpiphp_func *func; 820 int retval = 0; 821 int num, max, pass; 822 acpi_status status; 823 824 if (slot->flags & SLOT_ENABLED) 825 goto err_exit; 826 827 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 828 if (num == 0) { 829 /* Maybe only part of funcs are added. */ 830 dbg("No new device found\n"); 831 goto err_exit; 832 } 833 834 max = acpiphp_max_busnr(bus); 835 for (pass = 0; pass < 2; pass++) { 836 list_for_each_entry(dev, &bus->devices, bus_list) { 837 if (PCI_SLOT(dev->devfn) != slot->device) 838 continue; 839 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 840 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 841 max = pci_scan_bridge(bus, dev, max, pass); 842 if (pass && dev->subordinate) 843 pci_bus_size_bridges(dev->subordinate); 844 } 845 } 846 } 847 848 list_for_each_entry(func, &slot->funcs, sibling) 849 acpiphp_bus_add(func); 850 851 pci_bus_assign_resources(bus); 852 acpiphp_sanitize_bus(bus); 853 acpiphp_set_hpp_values(bus); 854 acpiphp_set_acpi_region(slot); 855 pci_enable_bridges(bus); 856 857 list_for_each_entry(dev, &bus->devices, bus_list) { 858 /* Assume that newly added devices are powered on already. */ 859 if (!dev->is_added) 860 dev->current_state = PCI_D0; 861 } 862 863 pci_bus_add_devices(bus); 864 865 slot->flags |= SLOT_ENABLED; 866 list_for_each_entry(func, &slot->funcs, sibling) { 867 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 868 func->function)); 869 if (!dev) { 870 /* Do not set SLOT_ENABLED flag if some funcs 871 are not added. */ 872 slot->flags &= (~SLOT_ENABLED); 873 continue; 874 } 875 876 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 877 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) { 878 pci_dev_put(dev); 879 continue; 880 } 881 882 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 883 if (ACPI_FAILURE(status)) 884 warn("find_p2p_bridge failed (error code = 0x%x)\n", 885 status); 886 pci_dev_put(dev); 887 } 888 889 890 err_exit: 891 return retval; 892 } 893 894 /* return first device in slot, acquiring a reference on it */ 895 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 896 { 897 struct pci_bus *bus = slot->bridge->pci_bus; 898 struct pci_dev *dev; 899 struct pci_dev *ret = NULL; 900 901 down_read(&pci_bus_sem); 902 list_for_each_entry(dev, &bus->devices, bus_list) 903 if (PCI_SLOT(dev->devfn) == slot->device) { 904 ret = pci_dev_get(dev); 905 break; 906 } 907 up_read(&pci_bus_sem); 908 909 return ret; 910 } 911 912 /** 913 * disable_device - disable a slot 914 * @slot: ACPI PHP slot 915 */ 916 static int disable_device(struct acpiphp_slot *slot) 917 { 918 struct acpiphp_func *func; 919 struct pci_dev *pdev; 920 struct pci_bus *bus = slot->bridge->pci_bus; 921 922 /* The slot will be enabled when func 0 is added, so check 923 func 0 before disable the slot. */ 924 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 925 if (!pdev) 926 goto err_exit; 927 pci_dev_put(pdev); 928 929 list_for_each_entry(func, &slot->funcs, sibling) { 930 if (func->bridge) { 931 /* cleanup p2p bridges under this P2P bridge */ 932 cleanup_p2p_bridge(func->bridge->handle, 933 (u32)1, NULL, NULL); 934 func->bridge = NULL; 935 } 936 } 937 938 /* 939 * enable_device() enumerates all functions in this device via 940 * pci_scan_slot(), whether they have associated ACPI hotplug 941 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 942 * here. 943 */ 944 while ((pdev = dev_in_slot(slot))) { 945 pci_stop_and_remove_bus_device(pdev); 946 pci_dev_put(pdev); 947 } 948 949 list_for_each_entry(func, &slot->funcs, sibling) { 950 acpiphp_bus_trim(func->handle); 951 } 952 953 slot->flags &= (~SLOT_ENABLED); 954 955 err_exit: 956 return 0; 957 } 958 959 960 /** 961 * get_slot_status - get ACPI slot status 962 * @slot: ACPI PHP slot 963 * 964 * If a slot has _STA for each function and if any one of them 965 * returned non-zero status, return it. 966 * 967 * If a slot doesn't have _STA and if any one of its functions' 968 * configuration space is configured, return 0x0f as a _STA. 969 * 970 * Otherwise return 0. 971 */ 972 static unsigned int get_slot_status(struct acpiphp_slot *slot) 973 { 974 acpi_status status; 975 unsigned long long sta = 0; 976 u32 dvid; 977 struct acpiphp_func *func; 978 979 list_for_each_entry(func, &slot->funcs, sibling) { 980 if (func->flags & FUNC_HAS_STA) { 981 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 982 if (ACPI_SUCCESS(status) && sta) 983 break; 984 } else { 985 pci_bus_read_config_dword(slot->bridge->pci_bus, 986 PCI_DEVFN(slot->device, 987 func->function), 988 PCI_VENDOR_ID, &dvid); 989 if (dvid != 0xffffffff) { 990 sta = ACPI_STA_ALL; 991 break; 992 } 993 } 994 } 995 996 return (unsigned int)sta; 997 } 998 999 /** 1000 * acpiphp_eject_slot - physically eject the slot 1001 * @slot: ACPI PHP slot 1002 */ 1003 int acpiphp_eject_slot(struct acpiphp_slot *slot) 1004 { 1005 acpi_status status; 1006 struct acpiphp_func *func; 1007 struct acpi_object_list arg_list; 1008 union acpi_object arg; 1009 1010 list_for_each_entry(func, &slot->funcs, sibling) { 1011 /* We don't want to call _EJ0 on non-existing functions. */ 1012 if ((func->flags & FUNC_HAS_EJ0)) { 1013 /* _EJ0 method take one argument */ 1014 arg_list.count = 1; 1015 arg_list.pointer = &arg; 1016 arg.type = ACPI_TYPE_INTEGER; 1017 arg.integer.value = 1; 1018 1019 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1020 if (ACPI_FAILURE(status)) { 1021 warn("%s: _EJ0 failed\n", __func__); 1022 return -1; 1023 } else 1024 break; 1025 } 1026 } 1027 return 0; 1028 } 1029 1030 /** 1031 * acpiphp_check_bridge - re-enumerate devices 1032 * @bridge: where to begin re-enumeration 1033 * 1034 * Iterate over all slots under this bridge and make sure that if a 1035 * card is present they are enabled, and if not they are disabled. 1036 */ 1037 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1038 { 1039 struct acpiphp_slot *slot; 1040 int retval = 0; 1041 int enabled, disabled; 1042 1043 enabled = disabled = 0; 1044 1045 for (slot = bridge->slots; slot; slot = slot->next) { 1046 unsigned int status = get_slot_status(slot); 1047 if (slot->flags & SLOT_ENABLED) { 1048 if (status == ACPI_STA_ALL) 1049 continue; 1050 retval = acpiphp_disable_slot(slot); 1051 if (retval) { 1052 err("Error occurred in disabling\n"); 1053 goto err_exit; 1054 } else { 1055 acpiphp_eject_slot(slot); 1056 } 1057 disabled++; 1058 } else { 1059 if (status != ACPI_STA_ALL) 1060 continue; 1061 retval = acpiphp_enable_slot(slot); 1062 if (retval) { 1063 err("Error occurred in enabling\n"); 1064 goto err_exit; 1065 } 1066 enabled++; 1067 } 1068 } 1069 1070 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 1071 1072 err_exit: 1073 return retval; 1074 } 1075 1076 static void acpiphp_set_hpp_values(struct pci_bus *bus) 1077 { 1078 struct pci_dev *dev; 1079 1080 list_for_each_entry(dev, &bus->devices, bus_list) 1081 pci_configure_slot(dev); 1082 } 1083 1084 /* 1085 * Remove devices for which we could not assign resources, call 1086 * arch specific code to fix-up the bus 1087 */ 1088 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1089 { 1090 struct pci_dev *dev; 1091 int i; 1092 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1093 1094 list_for_each_entry(dev, &bus->devices, bus_list) { 1095 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1096 struct resource *res = &dev->resource[i]; 1097 if ((res->flags & type_mask) && !res->start && 1098 res->end) { 1099 /* Could not assign a required resources 1100 * for this device, remove it */ 1101 pci_stop_and_remove_bus_device(dev); 1102 break; 1103 } 1104 } 1105 } 1106 } 1107 1108 /* Program resources in newly inserted bridge */ 1109 static int acpiphp_configure_bridge (acpi_handle handle) 1110 { 1111 struct pci_bus *bus; 1112 1113 if (acpi_is_root_bridge(handle)) { 1114 struct acpi_pci_root *root = acpi_pci_find_root(handle); 1115 bus = root->bus; 1116 } else { 1117 struct pci_dev *pdev = acpi_get_pci_dev(handle); 1118 bus = pdev->subordinate; 1119 pci_dev_put(pdev); 1120 } 1121 1122 pci_bus_size_bridges(bus); 1123 pci_bus_assign_resources(bus); 1124 acpiphp_sanitize_bus(bus); 1125 acpiphp_set_hpp_values(bus); 1126 pci_enable_bridges(bus); 1127 return 0; 1128 } 1129 1130 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1131 { 1132 struct acpi_device *device, *pdevice; 1133 acpi_handle phandle; 1134 1135 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1136 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1137 err("unexpected notification type %d\n", type); 1138 return; 1139 } 1140 1141 acpi_get_parent(handle, &phandle); 1142 if (acpi_bus_get_device(phandle, &pdevice)) { 1143 dbg("no parent device, assuming NULL\n"); 1144 pdevice = NULL; 1145 } 1146 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1147 err("cannot add bridge to acpi list\n"); 1148 return; 1149 } 1150 if (!acpiphp_configure_bridge(handle)) 1151 add_bridge(handle); 1152 else 1153 err("cannot configure and start bridge\n"); 1154 1155 } 1156 1157 /* 1158 * ACPI event handlers 1159 */ 1160 1161 static acpi_status 1162 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1163 { 1164 int *count = (int *)context; 1165 struct acpiphp_bridge *bridge; 1166 1167 bridge = acpiphp_handle_to_bridge(handle); 1168 if (bridge) 1169 (*count)++; 1170 return AE_OK ; 1171 } 1172 1173 static acpi_status 1174 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1175 { 1176 struct acpiphp_bridge *bridge; 1177 char objname[64]; 1178 struct acpi_buffer buffer = { .length = sizeof(objname), 1179 .pointer = objname }; 1180 1181 bridge = acpiphp_handle_to_bridge(handle); 1182 if (bridge) { 1183 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1184 dbg("%s: re-enumerating slots under %s\n", 1185 __func__, objname); 1186 acpiphp_check_bridge(bridge); 1187 } 1188 return AE_OK ; 1189 } 1190 1191 struct acpiphp_hp_work { 1192 struct work_struct work; 1193 acpi_handle handle; 1194 u32 type; 1195 void *context; 1196 }; 1197 1198 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type, 1199 void *context, 1200 void (*func)(struct work_struct *work)) 1201 { 1202 struct acpiphp_hp_work *hp_work; 1203 int ret; 1204 1205 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); 1206 if (!hp_work) 1207 return; 1208 1209 hp_work->handle = handle; 1210 hp_work->type = type; 1211 hp_work->context = context; 1212 1213 INIT_WORK(&hp_work->work, func); 1214 ret = queue_work(kacpi_hotplug_wq, &hp_work->work); 1215 if (!ret) 1216 kfree(hp_work); 1217 } 1218 1219 static void _handle_hotplug_event_bridge(struct work_struct *work) 1220 { 1221 struct acpiphp_bridge *bridge; 1222 char objname[64]; 1223 struct acpi_buffer buffer = { .length = sizeof(objname), 1224 .pointer = objname }; 1225 struct acpi_device *device; 1226 int num_sub_bridges = 0; 1227 struct acpiphp_hp_work *hp_work; 1228 acpi_handle handle; 1229 u32 type; 1230 1231 hp_work = container_of(work, struct acpiphp_hp_work, work); 1232 handle = hp_work->handle; 1233 type = hp_work->type; 1234 1235 if (acpi_bus_get_device(handle, &device)) { 1236 /* This bridge must have just been physically inserted */ 1237 handle_bridge_insertion(handle, type); 1238 goto out; 1239 } 1240 1241 bridge = acpiphp_handle_to_bridge(handle); 1242 if (type == ACPI_NOTIFY_BUS_CHECK) { 1243 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1244 count_sub_bridges, NULL, &num_sub_bridges, NULL); 1245 } 1246 1247 if (!bridge && !num_sub_bridges) { 1248 err("cannot get bridge info\n"); 1249 goto out; 1250 } 1251 1252 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1253 1254 switch (type) { 1255 case ACPI_NOTIFY_BUS_CHECK: 1256 /* bus re-enumerate */ 1257 dbg("%s: Bus check notify on %s\n", __func__, objname); 1258 if (bridge) { 1259 dbg("%s: re-enumerating slots under %s\n", 1260 __func__, objname); 1261 acpiphp_check_bridge(bridge); 1262 } 1263 if (num_sub_bridges) 1264 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1265 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1266 break; 1267 1268 case ACPI_NOTIFY_DEVICE_CHECK: 1269 /* device check */ 1270 dbg("%s: Device check notify on %s\n", __func__, objname); 1271 acpiphp_check_bridge(bridge); 1272 break; 1273 1274 case ACPI_NOTIFY_DEVICE_WAKE: 1275 /* wake event */ 1276 dbg("%s: Device wake notify on %s\n", __func__, objname); 1277 break; 1278 1279 case ACPI_NOTIFY_EJECT_REQUEST: 1280 /* request device eject */ 1281 dbg("%s: Device eject notify on %s\n", __func__, objname); 1282 if ((bridge->type != BRIDGE_TYPE_HOST) && 1283 (bridge->flags & BRIDGE_HAS_EJ0)) { 1284 struct acpiphp_slot *slot; 1285 slot = bridge->func->slot; 1286 if (!acpiphp_disable_slot(slot)) 1287 acpiphp_eject_slot(slot); 1288 } 1289 break; 1290 1291 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1292 printk(KERN_ERR "Device %s cannot be configured due" 1293 " to a frequency mismatch\n", objname); 1294 break; 1295 1296 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1297 printk(KERN_ERR "Device %s cannot be configured due" 1298 " to a bus mode mismatch\n", objname); 1299 break; 1300 1301 case ACPI_NOTIFY_POWER_FAULT: 1302 printk(KERN_ERR "Device %s has suffered a power fault\n", 1303 objname); 1304 break; 1305 1306 default: 1307 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1308 break; 1309 } 1310 1311 out: 1312 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1313 } 1314 1315 /** 1316 * handle_hotplug_event_bridge - handle ACPI event on bridges 1317 * @handle: Notify()'ed acpi_handle 1318 * @type: Notify code 1319 * @context: pointer to acpiphp_bridge structure 1320 * 1321 * Handles ACPI event notification on {host,p2p} bridges. 1322 */ 1323 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, 1324 void *context) 1325 { 1326 /* 1327 * Currently the code adds all hotplug events to the kacpid_wq 1328 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1329 * The proper way to fix this is to reorganize the code so that 1330 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1331 * For now just re-add this work to the kacpi_hotplug_wq so we 1332 * don't deadlock on hotplug actions. 1333 */ 1334 alloc_acpiphp_hp_work(handle, type, context, 1335 _handle_hotplug_event_bridge); 1336 } 1337 1338 static void _handle_hotplug_event_func(struct work_struct *work) 1339 { 1340 struct acpiphp_func *func; 1341 char objname[64]; 1342 struct acpi_buffer buffer = { .length = sizeof(objname), 1343 .pointer = objname }; 1344 struct acpiphp_hp_work *hp_work; 1345 acpi_handle handle; 1346 u32 type; 1347 void *context; 1348 1349 hp_work = container_of(work, struct acpiphp_hp_work, work); 1350 handle = hp_work->handle; 1351 type = hp_work->type; 1352 context = hp_work->context; 1353 1354 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1355 1356 func = (struct acpiphp_func *)context; 1357 1358 switch (type) { 1359 case ACPI_NOTIFY_BUS_CHECK: 1360 /* bus re-enumerate */ 1361 dbg("%s: Bus check notify on %s\n", __func__, objname); 1362 acpiphp_enable_slot(func->slot); 1363 break; 1364 1365 case ACPI_NOTIFY_DEVICE_CHECK: 1366 /* device check : re-enumerate from parent bus */ 1367 dbg("%s: Device check notify on %s\n", __func__, objname); 1368 acpiphp_check_bridge(func->slot->bridge); 1369 break; 1370 1371 case ACPI_NOTIFY_DEVICE_WAKE: 1372 /* wake event */ 1373 dbg("%s: Device wake notify on %s\n", __func__, objname); 1374 break; 1375 1376 case ACPI_NOTIFY_EJECT_REQUEST: 1377 /* request device eject */ 1378 dbg("%s: Device eject notify on %s\n", __func__, objname); 1379 if (!(acpiphp_disable_slot(func->slot))) 1380 acpiphp_eject_slot(func->slot); 1381 break; 1382 1383 default: 1384 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1385 break; 1386 } 1387 1388 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1389 } 1390 1391 /** 1392 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1393 * @handle: Notify()'ed acpi_handle 1394 * @type: Notify code 1395 * @context: pointer to acpiphp_func structure 1396 * 1397 * Handles ACPI event notification on slots. 1398 */ 1399 static void handle_hotplug_event_func(acpi_handle handle, u32 type, 1400 void *context) 1401 { 1402 /* 1403 * Currently the code adds all hotplug events to the kacpid_wq 1404 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1405 * The proper way to fix this is to reorganize the code so that 1406 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1407 * For now just re-add this work to the kacpi_hotplug_wq so we 1408 * don't deadlock on hotplug actions. 1409 */ 1410 alloc_acpiphp_hp_work(handle, type, context, 1411 _handle_hotplug_event_func); 1412 } 1413 1414 static acpi_status 1415 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1416 { 1417 int *count = (int *)context; 1418 1419 if (!acpi_is_root_bridge(handle)) 1420 return AE_OK; 1421 1422 (*count)++; 1423 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1424 handle_hotplug_event_bridge, NULL); 1425 1426 return AE_OK ; 1427 } 1428 1429 static struct acpi_pci_driver acpi_pci_hp_driver = { 1430 .add = add_bridge, 1431 .remove = remove_bridge, 1432 }; 1433 1434 /** 1435 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1436 */ 1437 int __init acpiphp_glue_init(void) 1438 { 1439 int num = 0; 1440 1441 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1442 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); 1443 1444 if (num <= 0) 1445 return -1; 1446 else 1447 acpi_pci_register_driver(&acpi_pci_hp_driver); 1448 1449 return 0; 1450 } 1451 1452 1453 /** 1454 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1455 * 1456 * This function frees all data allocated in acpiphp_glue_init(). 1457 */ 1458 void acpiphp_glue_exit(void) 1459 { 1460 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1461 } 1462 1463 1464 /** 1465 * acpiphp_get_num_slots - count number of slots in a system 1466 */ 1467 int __init acpiphp_get_num_slots(void) 1468 { 1469 struct acpiphp_bridge *bridge; 1470 int num_slots = 0; 1471 1472 list_for_each_entry(bridge, &bridge_list, list) { 1473 dbg("Bus %04x:%02x has %d slot%s\n", 1474 pci_domain_nr(bridge->pci_bus), 1475 bridge->pci_bus->number, bridge->nr_slots, 1476 bridge->nr_slots == 1 ? "" : "s"); 1477 num_slots += bridge->nr_slots; 1478 } 1479 1480 dbg("Total %d slots\n", num_slots); 1481 return num_slots; 1482 } 1483 1484 1485 /** 1486 * acpiphp_enable_slot - power on slot 1487 * @slot: ACPI PHP slot 1488 */ 1489 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1490 { 1491 int retval; 1492 1493 mutex_lock(&slot->crit_sect); 1494 1495 /* wake up all functions */ 1496 retval = power_on_slot(slot); 1497 if (retval) 1498 goto err_exit; 1499 1500 if (get_slot_status(slot) == ACPI_STA_ALL) { 1501 /* configure all functions */ 1502 retval = enable_device(slot); 1503 if (retval) 1504 power_off_slot(slot); 1505 } else { 1506 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1507 power_off_slot(slot); 1508 } 1509 1510 err_exit: 1511 mutex_unlock(&slot->crit_sect); 1512 return retval; 1513 } 1514 1515 /** 1516 * acpiphp_disable_slot - power off slot 1517 * @slot: ACPI PHP slot 1518 */ 1519 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1520 { 1521 int retval = 0; 1522 1523 mutex_lock(&slot->crit_sect); 1524 1525 /* unconfigure all functions */ 1526 retval = disable_device(slot); 1527 if (retval) 1528 goto err_exit; 1529 1530 /* power off all functions */ 1531 retval = power_off_slot(slot); 1532 if (retval) 1533 goto err_exit; 1534 1535 err_exit: 1536 mutex_unlock(&slot->crit_sect); 1537 return retval; 1538 } 1539 1540 1541 /* 1542 * slot enabled: 1 1543 * slot disabled: 0 1544 */ 1545 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1546 { 1547 return (slot->flags & SLOT_POWEREDON); 1548 } 1549 1550 1551 /* 1552 * latch open: 1 1553 * latch closed: 0 1554 */ 1555 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1556 { 1557 unsigned int sta; 1558 1559 sta = get_slot_status(slot); 1560 1561 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1562 } 1563 1564 1565 /* 1566 * adapter presence : 1 1567 * absence : 0 1568 */ 1569 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1570 { 1571 unsigned int sta; 1572 1573 sta = get_slot_status(slot); 1574 1575 return (sta == 0) ? 0 : 1; 1576 } 1577