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 if (bridge->type != BRIDGE_TYPE_HOST) { 547 status = acpi_remove_notify_handler(handle, 548 ACPI_SYSTEM_NOTIFY, 549 handle_hotplug_event_bridge); 550 if (ACPI_FAILURE(status)) 551 err("failed to remove notify handler\n"); 552 } 553 554 if ((bridge->type != BRIDGE_TYPE_HOST) && 555 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { 556 status = acpi_install_notify_handler(bridge->func->handle, 557 ACPI_SYSTEM_NOTIFY, 558 handle_hotplug_event_func, 559 bridge->func); 560 if (ACPI_FAILURE(status)) 561 err("failed to install interrupt notify handler\n"); 562 } 563 564 slot = bridge->slots; 565 while (slot) { 566 next = slot->next; 567 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) { 568 if (is_dock_device(func->handle)) { 569 unregister_hotplug_dock_device(func->handle); 570 unregister_dock_notifier(&func->nb); 571 } 572 if (!(func->flags & FUNC_HAS_DCK)) { 573 status = acpi_remove_notify_handler(func->handle, 574 ACPI_SYSTEM_NOTIFY, 575 handle_hotplug_event_func); 576 if (ACPI_FAILURE(status)) 577 err("failed to remove notify handler\n"); 578 } 579 list_del(&func->sibling); 580 kfree(func); 581 } 582 acpiphp_unregister_hotplug_slot(slot); 583 list_del(&slot->funcs); 584 kfree(slot); 585 slot = next; 586 } 587 588 /* 589 * Only P2P bridges have a pci_dev 590 */ 591 if (bridge->pci_dev) 592 put_device(&bridge->pci_bus->dev); 593 594 pci_dev_put(bridge->pci_dev); 595 list_del(&bridge->list); 596 kfree(bridge); 597 } 598 599 static acpi_status 600 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 601 { 602 struct acpiphp_bridge *bridge; 603 604 /* cleanup p2p bridges under this P2P bridge 605 in a depth-first manner */ 606 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 607 cleanup_p2p_bridge, NULL, NULL, NULL); 608 609 bridge = acpiphp_handle_to_bridge(handle); 610 if (bridge) 611 cleanup_bridge(bridge); 612 613 return AE_OK; 614 } 615 616 static void remove_bridge(struct acpi_pci_root *root) 617 { 618 struct acpiphp_bridge *bridge; 619 acpi_handle handle = root->device->handle; 620 621 /* cleanup p2p bridges under this host bridge 622 in a depth-first manner */ 623 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 624 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL); 625 626 /* 627 * On root bridges with hotplug slots directly underneath (ie, 628 * no p2p bridge between), we call cleanup_bridge(). 629 * 630 * The else clause cleans up root bridges that either had no 631 * hotplug slots at all, or had a p2p bridge underneath. 632 */ 633 bridge = acpiphp_handle_to_bridge(handle); 634 if (bridge) 635 cleanup_bridge(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); 746 dbg("acpi_bus_trim return %x\n", ret_val); 747 } 748 749 ret_val = acpi_bus_scan(func->handle); 750 if (!ret_val) 751 ret_val = acpi_bus_get_device(func->handle, &device); 752 753 if (ret_val) 754 dbg("error adding bus, %x\n", -ret_val); 755 756 return ret_val; 757 } 758 759 760 /** 761 * acpiphp_bus_trim - trim a bus from acpi subsystem 762 * @handle: handle to acpi namespace 763 */ 764 static int acpiphp_bus_trim(acpi_handle handle) 765 { 766 struct acpi_device *device; 767 int retval; 768 769 retval = acpi_bus_get_device(handle, &device); 770 if (retval) { 771 dbg("acpi_device not found\n"); 772 return retval; 773 } 774 775 retval = acpi_bus_trim(device); 776 if (retval) 777 err("cannot remove from acpi list\n"); 778 779 return retval; 780 } 781 782 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 783 { 784 struct acpiphp_func *func; 785 union acpi_object params[2]; 786 struct acpi_object_list arg_list; 787 788 list_for_each_entry(func, &slot->funcs, sibling) { 789 arg_list.count = 2; 790 arg_list.pointer = params; 791 params[0].type = ACPI_TYPE_INTEGER; 792 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 793 params[1].type = ACPI_TYPE_INTEGER; 794 params[1].integer.value = 1; 795 /* _REG is optional, we don't care about if there is failure */ 796 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL); 797 } 798 } 799 800 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 801 { 802 struct acpiphp_func *func; 803 804 if (!dev->subordinate) 805 return; 806 807 /* quirk, or pcie could set it already */ 808 if (dev->is_hotplug_bridge) 809 return; 810 811 if (PCI_SLOT(dev->devfn) != slot->device) 812 return; 813 814 list_for_each_entry(func, &slot->funcs, sibling) { 815 if (PCI_FUNC(dev->devfn) == func->function) { 816 /* check if this bridge has ejectable slots */ 817 if ((detect_ejectable_slots(func->handle) > 0)) 818 dev->is_hotplug_bridge = 1; 819 break; 820 } 821 } 822 } 823 /** 824 * enable_device - enable, configure a slot 825 * @slot: slot to be enabled 826 * 827 * This function should be called per *physical slot*, 828 * not per each slot object in ACPI namespace. 829 */ 830 static int __ref enable_device(struct acpiphp_slot *slot) 831 { 832 struct pci_dev *dev; 833 struct pci_bus *bus = slot->bridge->pci_bus; 834 struct acpiphp_func *func; 835 int retval = 0; 836 int num, max, pass; 837 acpi_status status; 838 839 if (slot->flags & SLOT_ENABLED) 840 goto err_exit; 841 842 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 843 if (num == 0) { 844 /* Maybe only part of funcs are added. */ 845 dbg("No new device found\n"); 846 goto err_exit; 847 } 848 849 max = acpiphp_max_busnr(bus); 850 for (pass = 0; pass < 2; pass++) { 851 list_for_each_entry(dev, &bus->devices, bus_list) { 852 if (PCI_SLOT(dev->devfn) != slot->device) 853 continue; 854 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 855 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 856 max = pci_scan_bridge(bus, dev, max, pass); 857 if (pass && dev->subordinate) { 858 check_hotplug_bridge(slot, dev); 859 pci_bus_size_bridges(dev->subordinate); 860 } 861 } 862 } 863 } 864 865 list_for_each_entry(func, &slot->funcs, sibling) 866 acpiphp_bus_add(func); 867 868 pci_bus_assign_resources(bus); 869 acpiphp_sanitize_bus(bus); 870 acpiphp_set_hpp_values(bus); 871 acpiphp_set_acpi_region(slot); 872 pci_enable_bridges(bus); 873 874 list_for_each_entry(dev, &bus->devices, bus_list) { 875 /* Assume that newly added devices are powered on already. */ 876 if (!dev->is_added) 877 dev->current_state = PCI_D0; 878 } 879 880 pci_bus_add_devices(bus); 881 882 slot->flags |= SLOT_ENABLED; 883 list_for_each_entry(func, &slot->funcs, sibling) { 884 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 885 func->function)); 886 if (!dev) { 887 /* Do not set SLOT_ENABLED flag if some funcs 888 are not added. */ 889 slot->flags &= (~SLOT_ENABLED); 890 continue; 891 } 892 893 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && 894 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) { 895 pci_dev_put(dev); 896 continue; 897 } 898 899 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); 900 if (ACPI_FAILURE(status)) 901 warn("find_p2p_bridge failed (error code = 0x%x)\n", 902 status); 903 pci_dev_put(dev); 904 } 905 906 907 err_exit: 908 return retval; 909 } 910 911 /* return first device in slot, acquiring a reference on it */ 912 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 913 { 914 struct pci_bus *bus = slot->bridge->pci_bus; 915 struct pci_dev *dev; 916 struct pci_dev *ret = NULL; 917 918 down_read(&pci_bus_sem); 919 list_for_each_entry(dev, &bus->devices, bus_list) 920 if (PCI_SLOT(dev->devfn) == slot->device) { 921 ret = pci_dev_get(dev); 922 break; 923 } 924 up_read(&pci_bus_sem); 925 926 return ret; 927 } 928 929 /** 930 * disable_device - disable a slot 931 * @slot: ACPI PHP slot 932 */ 933 static int disable_device(struct acpiphp_slot *slot) 934 { 935 struct acpiphp_func *func; 936 struct pci_dev *pdev; 937 struct pci_bus *bus = slot->bridge->pci_bus; 938 939 /* The slot will be enabled when func 0 is added, so check 940 func 0 before disable the slot. */ 941 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 942 if (!pdev) 943 goto err_exit; 944 pci_dev_put(pdev); 945 946 list_for_each_entry(func, &slot->funcs, sibling) { 947 if (func->bridge) { 948 /* cleanup p2p bridges under this P2P bridge */ 949 cleanup_p2p_bridge(func->bridge->handle, 950 (u32)1, NULL, NULL); 951 func->bridge = NULL; 952 } 953 } 954 955 /* 956 * enable_device() enumerates all functions in this device via 957 * pci_scan_slot(), whether they have associated ACPI hotplug 958 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 959 * here. 960 */ 961 while ((pdev = dev_in_slot(slot))) { 962 pci_stop_and_remove_bus_device(pdev); 963 pci_dev_put(pdev); 964 } 965 966 list_for_each_entry(func, &slot->funcs, sibling) { 967 acpiphp_bus_trim(func->handle); 968 } 969 970 slot->flags &= (~SLOT_ENABLED); 971 972 err_exit: 973 return 0; 974 } 975 976 977 /** 978 * get_slot_status - get ACPI slot status 979 * @slot: ACPI PHP slot 980 * 981 * If a slot has _STA for each function and if any one of them 982 * returned non-zero status, return it. 983 * 984 * If a slot doesn't have _STA and if any one of its functions' 985 * configuration space is configured, return 0x0f as a _STA. 986 * 987 * Otherwise return 0. 988 */ 989 static unsigned int get_slot_status(struct acpiphp_slot *slot) 990 { 991 acpi_status status; 992 unsigned long long sta = 0; 993 u32 dvid; 994 struct acpiphp_func *func; 995 996 list_for_each_entry(func, &slot->funcs, sibling) { 997 if (func->flags & FUNC_HAS_STA) { 998 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 999 if (ACPI_SUCCESS(status) && sta) 1000 break; 1001 } else { 1002 pci_bus_read_config_dword(slot->bridge->pci_bus, 1003 PCI_DEVFN(slot->device, 1004 func->function), 1005 PCI_VENDOR_ID, &dvid); 1006 if (dvid != 0xffffffff) { 1007 sta = ACPI_STA_ALL; 1008 break; 1009 } 1010 } 1011 } 1012 1013 return (unsigned int)sta; 1014 } 1015 1016 /** 1017 * acpiphp_eject_slot - physically eject the slot 1018 * @slot: ACPI PHP slot 1019 */ 1020 int acpiphp_eject_slot(struct acpiphp_slot *slot) 1021 { 1022 acpi_status status; 1023 struct acpiphp_func *func; 1024 struct acpi_object_list arg_list; 1025 union acpi_object arg; 1026 1027 list_for_each_entry(func, &slot->funcs, sibling) { 1028 /* We don't want to call _EJ0 on non-existing functions. */ 1029 if ((func->flags & FUNC_HAS_EJ0)) { 1030 /* _EJ0 method take one argument */ 1031 arg_list.count = 1; 1032 arg_list.pointer = &arg; 1033 arg.type = ACPI_TYPE_INTEGER; 1034 arg.integer.value = 1; 1035 1036 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 1037 if (ACPI_FAILURE(status)) { 1038 warn("%s: _EJ0 failed\n", __func__); 1039 return -1; 1040 } else 1041 break; 1042 } 1043 } 1044 return 0; 1045 } 1046 1047 /** 1048 * acpiphp_check_bridge - re-enumerate devices 1049 * @bridge: where to begin re-enumeration 1050 * 1051 * Iterate over all slots under this bridge and make sure that if a 1052 * card is present they are enabled, and if not they are disabled. 1053 */ 1054 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 1055 { 1056 struct acpiphp_slot *slot; 1057 int retval = 0; 1058 int enabled, disabled; 1059 1060 enabled = disabled = 0; 1061 1062 for (slot = bridge->slots; slot; slot = slot->next) { 1063 unsigned int status = get_slot_status(slot); 1064 if (slot->flags & SLOT_ENABLED) { 1065 if (status == ACPI_STA_ALL) 1066 continue; 1067 retval = acpiphp_disable_slot(slot); 1068 if (retval) { 1069 err("Error occurred in disabling\n"); 1070 goto err_exit; 1071 } else { 1072 acpiphp_eject_slot(slot); 1073 } 1074 disabled++; 1075 } else { 1076 if (status != ACPI_STA_ALL) 1077 continue; 1078 retval = acpiphp_enable_slot(slot); 1079 if (retval) { 1080 err("Error occurred in enabling\n"); 1081 goto err_exit; 1082 } 1083 enabled++; 1084 } 1085 } 1086 1087 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 1088 1089 err_exit: 1090 return retval; 1091 } 1092 1093 static void acpiphp_set_hpp_values(struct pci_bus *bus) 1094 { 1095 struct pci_dev *dev; 1096 1097 list_for_each_entry(dev, &bus->devices, bus_list) 1098 pci_configure_slot(dev); 1099 } 1100 1101 /* 1102 * Remove devices for which we could not assign resources, call 1103 * arch specific code to fix-up the bus 1104 */ 1105 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1106 { 1107 struct pci_dev *dev; 1108 int i; 1109 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1110 1111 list_for_each_entry(dev, &bus->devices, bus_list) { 1112 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1113 struct resource *res = &dev->resource[i]; 1114 if ((res->flags & type_mask) && !res->start && 1115 res->end) { 1116 /* Could not assign a required resources 1117 * for this device, remove it */ 1118 pci_stop_and_remove_bus_device(dev); 1119 break; 1120 } 1121 } 1122 } 1123 } 1124 1125 /* Program resources in newly inserted bridge */ 1126 static int acpiphp_configure_p2p_bridge(acpi_handle handle) 1127 { 1128 struct pci_dev *pdev = acpi_get_pci_dev(handle); 1129 struct pci_bus *bus = pdev->subordinate; 1130 1131 pci_dev_put(pdev); 1132 1133 pci_bus_size_bridges(bus); 1134 pci_bus_assign_resources(bus); 1135 acpiphp_sanitize_bus(bus); 1136 acpiphp_set_hpp_values(bus); 1137 pci_enable_bridges(bus); 1138 return 0; 1139 } 1140 1141 static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type) 1142 { 1143 struct acpi_device *device; 1144 1145 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1146 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1147 err("unexpected notification type %d\n", type); 1148 return; 1149 } 1150 1151 if (acpi_bus_scan(handle)) { 1152 err("cannot add bridge to acpi list\n"); 1153 return; 1154 } 1155 if (acpi_bus_get_device(handle, &device)) { 1156 err("ACPI device object missing\n"); 1157 return; 1158 } 1159 if (!acpiphp_configure_p2p_bridge(handle)) 1160 add_p2p_bridge(handle); 1161 else 1162 err("cannot configure and start bridge\n"); 1163 1164 } 1165 1166 /* 1167 * ACPI event handlers 1168 */ 1169 1170 static acpi_status 1171 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1172 { 1173 int *count = (int *)context; 1174 struct acpiphp_bridge *bridge; 1175 1176 bridge = acpiphp_handle_to_bridge(handle); 1177 if (bridge) 1178 (*count)++; 1179 return AE_OK ; 1180 } 1181 1182 static acpi_status 1183 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1184 { 1185 struct acpiphp_bridge *bridge; 1186 char objname[64]; 1187 struct acpi_buffer buffer = { .length = sizeof(objname), 1188 .pointer = objname }; 1189 1190 bridge = acpiphp_handle_to_bridge(handle); 1191 if (bridge) { 1192 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1193 dbg("%s: re-enumerating slots under %s\n", 1194 __func__, objname); 1195 acpiphp_check_bridge(bridge); 1196 } 1197 return AE_OK ; 1198 } 1199 1200 static void _handle_hotplug_event_bridge(struct work_struct *work) 1201 { 1202 struct acpiphp_bridge *bridge; 1203 char objname[64]; 1204 struct acpi_buffer buffer = { .length = sizeof(objname), 1205 .pointer = objname }; 1206 struct acpi_device *device; 1207 int num_sub_bridges = 0; 1208 struct acpi_hp_work *hp_work; 1209 acpi_handle handle; 1210 u32 type; 1211 1212 hp_work = container_of(work, struct acpi_hp_work, work); 1213 handle = hp_work->handle; 1214 type = hp_work->type; 1215 1216 if (acpi_bus_get_device(handle, &device)) { 1217 /* This bridge must have just been physically inserted */ 1218 handle_p2p_bridge_insertion(handle, type); 1219 goto out; 1220 } 1221 1222 bridge = acpiphp_handle_to_bridge(handle); 1223 if (type == ACPI_NOTIFY_BUS_CHECK) { 1224 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, 1225 count_sub_bridges, NULL, &num_sub_bridges, NULL); 1226 } 1227 1228 if (!bridge && !num_sub_bridges) { 1229 err("cannot get bridge info\n"); 1230 goto out; 1231 } 1232 1233 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1234 1235 switch (type) { 1236 case ACPI_NOTIFY_BUS_CHECK: 1237 /* bus re-enumerate */ 1238 dbg("%s: Bus check notify on %s\n", __func__, objname); 1239 if (bridge) { 1240 dbg("%s: re-enumerating slots under %s\n", 1241 __func__, objname); 1242 acpiphp_check_bridge(bridge); 1243 } 1244 if (num_sub_bridges) 1245 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1246 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1247 break; 1248 1249 case ACPI_NOTIFY_DEVICE_CHECK: 1250 /* device check */ 1251 dbg("%s: Device check notify on %s\n", __func__, objname); 1252 acpiphp_check_bridge(bridge); 1253 break; 1254 1255 case ACPI_NOTIFY_DEVICE_WAKE: 1256 /* wake event */ 1257 dbg("%s: Device wake notify on %s\n", __func__, objname); 1258 break; 1259 1260 case ACPI_NOTIFY_EJECT_REQUEST: 1261 /* request device eject */ 1262 dbg("%s: Device eject notify on %s\n", __func__, objname); 1263 if ((bridge->type != BRIDGE_TYPE_HOST) && 1264 (bridge->flags & BRIDGE_HAS_EJ0)) { 1265 struct acpiphp_slot *slot; 1266 slot = bridge->func->slot; 1267 if (!acpiphp_disable_slot(slot)) 1268 acpiphp_eject_slot(slot); 1269 } 1270 break; 1271 1272 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1273 printk(KERN_ERR "Device %s cannot be configured due" 1274 " to a frequency mismatch\n", objname); 1275 break; 1276 1277 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1278 printk(KERN_ERR "Device %s cannot be configured due" 1279 " to a bus mode mismatch\n", objname); 1280 break; 1281 1282 case ACPI_NOTIFY_POWER_FAULT: 1283 printk(KERN_ERR "Device %s has suffered a power fault\n", 1284 objname); 1285 break; 1286 1287 default: 1288 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1289 break; 1290 } 1291 1292 out: 1293 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1294 } 1295 1296 /** 1297 * handle_hotplug_event_bridge - handle ACPI event on bridges 1298 * @handle: Notify()'ed acpi_handle 1299 * @type: Notify code 1300 * @context: pointer to acpiphp_bridge structure 1301 * 1302 * Handles ACPI event notification on {host,p2p} bridges. 1303 */ 1304 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, 1305 void *context) 1306 { 1307 /* 1308 * Currently the code adds all hotplug events to the kacpid_wq 1309 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1310 * The proper way to fix this is to reorganize the code so that 1311 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1312 * For now just re-add this work to the kacpi_hotplug_wq so we 1313 * don't deadlock on hotplug actions. 1314 */ 1315 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge); 1316 } 1317 1318 static void _handle_hotplug_event_func(struct work_struct *work) 1319 { 1320 struct acpiphp_func *func; 1321 char objname[64]; 1322 struct acpi_buffer buffer = { .length = sizeof(objname), 1323 .pointer = objname }; 1324 struct acpi_hp_work *hp_work; 1325 acpi_handle handle; 1326 u32 type; 1327 void *context; 1328 1329 hp_work = container_of(work, struct acpi_hp_work, work); 1330 handle = hp_work->handle; 1331 type = hp_work->type; 1332 context = hp_work->context; 1333 1334 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1335 1336 func = (struct acpiphp_func *)context; 1337 1338 switch (type) { 1339 case ACPI_NOTIFY_BUS_CHECK: 1340 /* bus re-enumerate */ 1341 dbg("%s: Bus check notify on %s\n", __func__, objname); 1342 acpiphp_enable_slot(func->slot); 1343 break; 1344 1345 case ACPI_NOTIFY_DEVICE_CHECK: 1346 /* device check : re-enumerate from parent bus */ 1347 dbg("%s: Device check notify on %s\n", __func__, objname); 1348 acpiphp_check_bridge(func->slot->bridge); 1349 break; 1350 1351 case ACPI_NOTIFY_DEVICE_WAKE: 1352 /* wake event */ 1353 dbg("%s: Device wake notify on %s\n", __func__, objname); 1354 break; 1355 1356 case ACPI_NOTIFY_EJECT_REQUEST: 1357 /* request device eject */ 1358 dbg("%s: Device eject notify on %s\n", __func__, objname); 1359 if (!(acpiphp_disable_slot(func->slot))) 1360 acpiphp_eject_slot(func->slot); 1361 break; 1362 1363 default: 1364 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1365 break; 1366 } 1367 1368 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1369 } 1370 1371 /** 1372 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1373 * @handle: Notify()'ed acpi_handle 1374 * @type: Notify code 1375 * @context: pointer to acpiphp_func structure 1376 * 1377 * Handles ACPI event notification on slots. 1378 */ 1379 static void handle_hotplug_event_func(acpi_handle handle, u32 type, 1380 void *context) 1381 { 1382 /* 1383 * Currently the code adds all hotplug events to the kacpid_wq 1384 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1385 * The proper way to fix this is to reorganize the code so that 1386 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1387 * For now just re-add this work to the kacpi_hotplug_wq so we 1388 * don't deadlock on hotplug actions. 1389 */ 1390 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func); 1391 } 1392 1393 static struct acpi_pci_driver acpi_pci_hp_driver = { 1394 .add = add_bridge, 1395 .remove = remove_bridge, 1396 }; 1397 1398 /** 1399 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1400 */ 1401 int __init acpiphp_glue_init(void) 1402 { 1403 acpi_pci_register_driver(&acpi_pci_hp_driver); 1404 1405 return 0; 1406 } 1407 1408 1409 /** 1410 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1411 * 1412 * This function frees all data allocated in acpiphp_glue_init(). 1413 */ 1414 void acpiphp_glue_exit(void) 1415 { 1416 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1417 } 1418 1419 1420 /** 1421 * acpiphp_get_num_slots - count number of slots in a system 1422 */ 1423 int __init acpiphp_get_num_slots(void) 1424 { 1425 struct acpiphp_bridge *bridge; 1426 int num_slots = 0; 1427 1428 list_for_each_entry(bridge, &bridge_list, list) { 1429 dbg("Bus %04x:%02x has %d slot%s\n", 1430 pci_domain_nr(bridge->pci_bus), 1431 bridge->pci_bus->number, bridge->nr_slots, 1432 bridge->nr_slots == 1 ? "" : "s"); 1433 num_slots += bridge->nr_slots; 1434 } 1435 1436 dbg("Total %d slots\n", num_slots); 1437 return num_slots; 1438 } 1439 1440 1441 /** 1442 * acpiphp_enable_slot - power on slot 1443 * @slot: ACPI PHP slot 1444 */ 1445 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1446 { 1447 int retval; 1448 1449 mutex_lock(&slot->crit_sect); 1450 1451 /* wake up all functions */ 1452 retval = power_on_slot(slot); 1453 if (retval) 1454 goto err_exit; 1455 1456 if (get_slot_status(slot) == ACPI_STA_ALL) { 1457 /* configure all functions */ 1458 retval = enable_device(slot); 1459 if (retval) 1460 power_off_slot(slot); 1461 } else { 1462 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1463 power_off_slot(slot); 1464 } 1465 1466 err_exit: 1467 mutex_unlock(&slot->crit_sect); 1468 return retval; 1469 } 1470 1471 /** 1472 * acpiphp_disable_slot - power off slot 1473 * @slot: ACPI PHP slot 1474 */ 1475 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1476 { 1477 int retval = 0; 1478 1479 mutex_lock(&slot->crit_sect); 1480 1481 /* unconfigure all functions */ 1482 retval = disable_device(slot); 1483 if (retval) 1484 goto err_exit; 1485 1486 /* power off all functions */ 1487 retval = power_off_slot(slot); 1488 if (retval) 1489 goto err_exit; 1490 1491 err_exit: 1492 mutex_unlock(&slot->crit_sect); 1493 return retval; 1494 } 1495 1496 1497 /* 1498 * slot enabled: 1 1499 * slot disabled: 0 1500 */ 1501 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1502 { 1503 return (slot->flags & SLOT_POWEREDON); 1504 } 1505 1506 1507 /* 1508 * latch open: 1 1509 * latch closed: 0 1510 */ 1511 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1512 { 1513 unsigned int sta; 1514 1515 sta = get_slot_status(slot); 1516 1517 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1; 1518 } 1519 1520 1521 /* 1522 * adapter presence : 1 1523 * absence : 0 1524 */ 1525 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1526 { 1527 unsigned int sta; 1528 1529 sta = get_slot_status(slot); 1530 1531 return (sta == 0) ? 0 : 1; 1532 } 1533