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 #define pr_fmt(fmt) "acpiphp_glue: " fmt 43 44 #include <linux/init.h> 45 #include <linux/module.h> 46 47 #include <linux/kernel.h> 48 #include <linux/pci.h> 49 #include <linux/pci_hotplug.h> 50 #include <linux/pci-acpi.h> 51 #include <linux/pm_runtime.h> 52 #include <linux/mutex.h> 53 #include <linux/slab.h> 54 #include <linux/acpi.h> 55 56 #include "../pci.h" 57 #include "acpiphp.h" 58 59 static LIST_HEAD(bridge_list); 60 static DEFINE_MUTEX(bridge_mutex); 61 static DEFINE_MUTEX(acpiphp_context_lock); 62 63 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); 64 static void acpiphp_sanitize_bus(struct pci_bus *bus); 65 static void acpiphp_set_hpp_values(struct pci_bus *bus); 66 static void hotplug_event(acpi_handle handle, u32 type, void *data); 67 static void free_bridge(struct kref *kref); 68 69 static void acpiphp_context_handler(acpi_handle handle, void *context) 70 { 71 /* Intentionally empty. */ 72 } 73 74 /** 75 * acpiphp_init_context - Create hotplug context and grab a reference to it. 76 * @handle: ACPI object handle to create the context for. 77 * 78 * Call under acpiphp_context_lock. 79 */ 80 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle) 81 { 82 struct acpiphp_context *context; 83 acpi_status status; 84 85 context = kzalloc(sizeof(*context), GFP_KERNEL); 86 if (!context) 87 return NULL; 88 89 context->handle = handle; 90 context->refcount = 1; 91 status = acpi_attach_data(handle, acpiphp_context_handler, context); 92 if (ACPI_FAILURE(status)) { 93 kfree(context); 94 return NULL; 95 } 96 return context; 97 } 98 99 /** 100 * acpiphp_get_context - Get hotplug context and grab a reference to it. 101 * @handle: ACPI object handle to get the context for. 102 * 103 * Call under acpiphp_context_lock. 104 */ 105 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle) 106 { 107 struct acpiphp_context *context = NULL; 108 acpi_status status; 109 void *data; 110 111 status = acpi_get_data(handle, acpiphp_context_handler, &data); 112 if (ACPI_SUCCESS(status)) { 113 context = data; 114 context->refcount++; 115 } 116 return context; 117 } 118 119 /** 120 * acpiphp_put_context - Drop a reference to ACPI hotplug context. 121 * @handle: ACPI object handle to put the context for. 122 * 123 * The context object is removed if there are no more references to it. 124 * 125 * Call under acpiphp_context_lock. 126 */ 127 static void acpiphp_put_context(struct acpiphp_context *context) 128 { 129 if (--context->refcount) 130 return; 131 132 WARN_ON(context->bridge); 133 acpi_detach_data(context->handle, acpiphp_context_handler); 134 kfree(context); 135 } 136 137 static inline void get_bridge(struct acpiphp_bridge *bridge) 138 { 139 kref_get(&bridge->ref); 140 } 141 142 static inline void put_bridge(struct acpiphp_bridge *bridge) 143 { 144 kref_put(&bridge->ref, free_bridge); 145 } 146 147 static void free_bridge(struct kref *kref) 148 { 149 struct acpiphp_context *context; 150 struct acpiphp_bridge *bridge; 151 struct acpiphp_slot *slot, *next; 152 struct acpiphp_func *func, *tmp; 153 154 mutex_lock(&acpiphp_context_lock); 155 156 bridge = container_of(kref, struct acpiphp_bridge, ref); 157 158 list_for_each_entry_safe(slot, next, &bridge->slots, node) { 159 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) 160 acpiphp_put_context(func_to_context(func)); 161 162 kfree(slot); 163 } 164 165 context = bridge->context; 166 /* Root bridges will not have hotplug context. */ 167 if (context) { 168 /* Release the reference taken by acpiphp_enumerate_slots(). */ 169 put_bridge(context->func.parent); 170 context->bridge = NULL; 171 acpiphp_put_context(context); 172 } 173 174 put_device(&bridge->pci_bus->dev); 175 pci_dev_put(bridge->pci_dev); 176 kfree(bridge); 177 178 mutex_unlock(&acpiphp_context_lock); 179 } 180 181 /* 182 * the _DCK method can do funny things... and sometimes not 183 * hah-hah funny. 184 * 185 * TBD - figure out a way to only call fixups for 186 * systems that require them. 187 */ 188 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) 189 { 190 struct acpiphp_context *context = data; 191 struct pci_bus *bus = context->func.slot->bus; 192 u32 buses; 193 194 if (!bus->self) 195 return; 196 197 /* fixup bad _DCK function that rewrites 198 * secondary bridge on slot 199 */ 200 pci_read_config_dword(bus->self, 201 PCI_PRIMARY_BUS, 202 &buses); 203 204 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 205 buses = (buses & 0xff000000) 206 | ((unsigned int)(bus->primary) << 0) 207 | ((unsigned int)(bus->busn_res.start) << 8) 208 | ((unsigned int)(bus->busn_res.end) << 16); 209 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 210 } 211 } 212 213 static void dock_event(acpi_handle handle, u32 type, void *data) 214 { 215 struct acpiphp_context *context; 216 217 mutex_lock(&acpiphp_context_lock); 218 context = acpiphp_get_context(handle); 219 if (!context || WARN_ON(context->handle != handle) 220 || context->func.parent->is_going_away) { 221 mutex_unlock(&acpiphp_context_lock); 222 return; 223 } 224 get_bridge(context->func.parent); 225 acpiphp_put_context(context); 226 mutex_unlock(&acpiphp_context_lock); 227 228 hotplug_event(handle, type, data); 229 230 put_bridge(context->func.parent); 231 } 232 233 static const struct acpi_dock_ops acpiphp_dock_ops = { 234 .fixup = post_dock_fixups, 235 .handler = dock_event, 236 }; 237 238 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 239 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 240 { 241 u32 reg32; 242 acpi_handle tmp; 243 struct acpi_pci_root *root; 244 245 /* Check whether the PCIe port supports native PCIe hotplug */ 246 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 247 return false; 248 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 249 return false; 250 251 /* 252 * Check whether native PCIe hotplug has been enabled for 253 * this PCIe hierarchy. 254 */ 255 tmp = acpi_find_root_bridge_handle(pdev); 256 if (!tmp) 257 return false; 258 root = acpi_pci_find_root(tmp); 259 if (!root) 260 return false; 261 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 262 return false; 263 264 return true; 265 } 266 267 static void acpiphp_dock_init(void *data) 268 { 269 struct acpiphp_context *context = data; 270 271 get_bridge(context->func.parent); 272 } 273 274 static void acpiphp_dock_release(void *data) 275 { 276 struct acpiphp_context *context = data; 277 278 put_bridge(context->func.parent); 279 } 280 281 /* callback routine to register each ACPI PCI slot object */ 282 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, 283 void **rv) 284 { 285 struct acpiphp_bridge *bridge = data; 286 struct acpiphp_context *context; 287 struct acpiphp_slot *slot; 288 struct acpiphp_func *newfunc; 289 acpi_status status = AE_OK; 290 unsigned long long adr; 291 int device, function; 292 struct pci_bus *pbus = bridge->pci_bus; 293 struct pci_dev *pdev = bridge->pci_dev; 294 u32 val; 295 296 if (pdev && device_is_managed_by_native_pciehp(pdev)) 297 return AE_OK; 298 299 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 300 if (ACPI_FAILURE(status)) { 301 if (status != AE_NOT_FOUND) 302 acpi_handle_warn(handle, 303 "can't evaluate _ADR (%#x)\n", status); 304 return AE_OK; 305 } 306 307 device = (adr >> 16) & 0xffff; 308 function = adr & 0xffff; 309 310 mutex_lock(&acpiphp_context_lock); 311 context = acpiphp_init_context(handle); 312 if (!context) { 313 mutex_unlock(&acpiphp_context_lock); 314 acpi_handle_err(handle, "No hotplug context\n"); 315 return AE_NOT_EXIST; 316 } 317 newfunc = &context->func; 318 newfunc->function = function; 319 newfunc->parent = bridge; 320 mutex_unlock(&acpiphp_context_lock); 321 322 if (acpi_has_method(handle, "_EJ0")) 323 newfunc->flags = FUNC_HAS_EJ0; 324 325 if (acpi_has_method(handle, "_STA")) 326 newfunc->flags |= FUNC_HAS_STA; 327 328 if (acpi_has_method(handle, "_DCK")) 329 newfunc->flags |= FUNC_HAS_DCK; 330 331 /* search for objects that share the same slot */ 332 list_for_each_entry(slot, &bridge->slots, node) 333 if (slot->device == device) 334 goto slot_found; 335 336 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 337 if (!slot) { 338 mutex_lock(&acpiphp_context_lock); 339 acpiphp_put_context(context); 340 mutex_unlock(&acpiphp_context_lock); 341 return AE_NO_MEMORY; 342 } 343 344 slot->bus = bridge->pci_bus; 345 slot->device = device; 346 INIT_LIST_HEAD(&slot->funcs); 347 mutex_init(&slot->crit_sect); 348 349 list_add_tail(&slot->node, &bridge->slots); 350 351 /* Register slots for ejectable functions only. */ 352 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { 353 unsigned long long sun; 354 int retval; 355 356 bridge->nr_slots++; 357 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 358 if (ACPI_FAILURE(status)) 359 sun = bridge->nr_slots; 360 361 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 362 sun, pci_domain_nr(pbus), pbus->number, device); 363 364 retval = acpiphp_register_hotplug_slot(slot, sun); 365 if (retval) { 366 slot->slot = NULL; 367 bridge->nr_slots--; 368 if (retval == -EBUSY) 369 pr_warn("Slot %llu already registered by another " 370 "hotplug driver\n", sun); 371 else 372 pr_warn("acpiphp_register_hotplug_slot failed " 373 "(err code = 0x%x)\n", retval); 374 } 375 /* Even if the slot registration fails, we can still use it. */ 376 } 377 378 slot_found: 379 newfunc->slot = slot; 380 list_add_tail(&newfunc->sibling, &slot->funcs); 381 382 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 383 &val, 60*1000)) 384 slot->flags |= SLOT_ENABLED; 385 386 if (is_dock_device(handle)) { 387 /* we don't want to call this device's _EJ0 388 * because we want the dock notify handler 389 * to call it after it calls _DCK 390 */ 391 newfunc->flags &= ~FUNC_HAS_EJ0; 392 if (register_hotplug_dock_device(handle, 393 &acpiphp_dock_ops, context, 394 acpiphp_dock_init, acpiphp_dock_release)) 395 pr_debug("failed to register dock device\n"); 396 } 397 398 /* install notify handler */ 399 if (!(newfunc->flags & FUNC_HAS_DCK)) { 400 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 401 handle_hotplug_event, 402 context); 403 if (ACPI_FAILURE(status)) 404 acpi_handle_err(handle, 405 "failed to install notify handler\n"); 406 } 407 408 return AE_OK; 409 } 410 411 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 412 { 413 struct acpiphp_context *context; 414 struct acpiphp_bridge *bridge = NULL; 415 416 mutex_lock(&acpiphp_context_lock); 417 context = acpiphp_get_context(handle); 418 if (context) { 419 bridge = context->bridge; 420 if (bridge) 421 get_bridge(bridge); 422 423 acpiphp_put_context(context); 424 } 425 mutex_unlock(&acpiphp_context_lock); 426 return bridge; 427 } 428 429 static void cleanup_bridge(struct acpiphp_bridge *bridge) 430 { 431 struct acpiphp_slot *slot; 432 struct acpiphp_func *func; 433 acpi_status status; 434 435 list_for_each_entry(slot, &bridge->slots, node) { 436 list_for_each_entry(func, &slot->funcs, sibling) { 437 acpi_handle handle = func_to_handle(func); 438 439 if (is_dock_device(handle)) 440 unregister_hotplug_dock_device(handle); 441 442 if (!(func->flags & FUNC_HAS_DCK)) { 443 status = acpi_remove_notify_handler(handle, 444 ACPI_SYSTEM_NOTIFY, 445 handle_hotplug_event); 446 if (ACPI_FAILURE(status)) 447 pr_err("failed to remove notify handler\n"); 448 } 449 } 450 slot->flags |= SLOT_IS_GOING_AWAY; 451 if (slot->slot) 452 acpiphp_unregister_hotplug_slot(slot); 453 } 454 455 mutex_lock(&bridge_mutex); 456 list_del(&bridge->list); 457 mutex_unlock(&bridge_mutex); 458 459 mutex_lock(&acpiphp_context_lock); 460 bridge->is_going_away = true; 461 mutex_unlock(&acpiphp_context_lock); 462 } 463 464 /** 465 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 466 * @bus: bus to start search with 467 */ 468 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 469 { 470 struct list_head *tmp; 471 unsigned char max, n; 472 473 /* 474 * pci_bus_max_busnr will return the highest 475 * reserved busnr for all these children. 476 * that is equivalent to the bus->subordinate 477 * value. We don't want to use the parent's 478 * bus->subordinate value because it could have 479 * padding in it. 480 */ 481 max = bus->busn_res.start; 482 483 list_for_each(tmp, &bus->children) { 484 n = pci_bus_max_busnr(pci_bus_b(tmp)); 485 if (n > max) 486 max = n; 487 } 488 return max; 489 } 490 491 /** 492 * acpiphp_bus_add - Scan ACPI namespace subtree. 493 * @handle: ACPI object handle to start the scan from. 494 */ 495 static void acpiphp_bus_add(acpi_handle handle) 496 { 497 struct acpi_device *adev = NULL; 498 499 acpi_bus_scan(handle); 500 acpi_bus_get_device(handle, &adev); 501 if (acpi_device_enumerated(adev)) 502 acpi_device_set_power(adev, ACPI_STATE_D0); 503 } 504 505 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 506 { 507 struct acpiphp_func *func; 508 union acpi_object params[2]; 509 struct acpi_object_list arg_list; 510 511 list_for_each_entry(func, &slot->funcs, sibling) { 512 arg_list.count = 2; 513 arg_list.pointer = params; 514 params[0].type = ACPI_TYPE_INTEGER; 515 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 516 params[1].type = ACPI_TYPE_INTEGER; 517 params[1].integer.value = 1; 518 /* _REG is optional, we don't care about if there is failure */ 519 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, 520 NULL); 521 } 522 } 523 524 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 525 { 526 struct acpiphp_func *func; 527 528 /* quirk, or pcie could set it already */ 529 if (dev->is_hotplug_bridge) 530 return; 531 532 list_for_each_entry(func, &slot->funcs, sibling) { 533 if (PCI_FUNC(dev->devfn) == func->function) { 534 dev->is_hotplug_bridge = 1; 535 break; 536 } 537 } 538 } 539 540 static int acpiphp_rescan_slot(struct acpiphp_slot *slot) 541 { 542 struct acpiphp_func *func; 543 544 list_for_each_entry(func, &slot->funcs, sibling) 545 acpiphp_bus_add(func_to_handle(func)); 546 547 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); 548 } 549 550 /** 551 * enable_slot - enable, configure a slot 552 * @slot: slot to be enabled 553 * 554 * This function should be called per *physical slot*, 555 * not per each slot object in ACPI namespace. 556 */ 557 static void __ref enable_slot(struct acpiphp_slot *slot) 558 { 559 struct pci_dev *dev; 560 struct pci_bus *bus = slot->bus; 561 struct acpiphp_func *func; 562 int max, pass; 563 LIST_HEAD(add_list); 564 565 acpiphp_rescan_slot(slot); 566 max = acpiphp_max_busnr(bus); 567 for (pass = 0; pass < 2; pass++) { 568 list_for_each_entry(dev, &bus->devices, bus_list) { 569 if (PCI_SLOT(dev->devfn) != slot->device) 570 continue; 571 572 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 573 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 574 max = pci_scan_bridge(bus, dev, max, pass); 575 if (pass && dev->subordinate) { 576 check_hotplug_bridge(slot, dev); 577 pcibios_resource_survey_bus(dev->subordinate); 578 __pci_bus_size_bridges(dev->subordinate, 579 &add_list); 580 } 581 } 582 } 583 } 584 __pci_bus_assign_resources(bus, &add_list, NULL); 585 586 acpiphp_sanitize_bus(bus); 587 acpiphp_set_hpp_values(bus); 588 acpiphp_set_acpi_region(slot); 589 590 list_for_each_entry(dev, &bus->devices, bus_list) { 591 /* Assume that newly added devices are powered on already. */ 592 if (!dev->is_added) 593 dev->current_state = PCI_D0; 594 } 595 596 pci_bus_add_devices(bus); 597 598 slot->flags |= SLOT_ENABLED; 599 list_for_each_entry(func, &slot->funcs, sibling) { 600 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 601 func->function)); 602 if (!dev) { 603 /* Do not set SLOT_ENABLED flag if some funcs 604 are not added. */ 605 slot->flags &= (~SLOT_ENABLED); 606 continue; 607 } 608 } 609 } 610 611 /** 612 * disable_slot - disable a slot 613 * @slot: ACPI PHP slot 614 */ 615 static void disable_slot(struct acpiphp_slot *slot) 616 { 617 struct pci_bus *bus = slot->bus; 618 struct pci_dev *dev, *prev; 619 struct acpiphp_func *func; 620 621 /* 622 * enable_slot() enumerates all functions in this device via 623 * pci_scan_slot(), whether they have associated ACPI hotplug 624 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 625 * here. 626 */ 627 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) 628 if (PCI_SLOT(dev->devfn) == slot->device) 629 pci_stop_and_remove_bus_device(dev); 630 631 list_for_each_entry(func, &slot->funcs, sibling) { 632 struct acpi_device *adev; 633 634 if (!acpi_bus_get_device(func_to_handle(func), &adev)) 635 acpi_bus_trim(adev); 636 } 637 638 slot->flags &= (~SLOT_ENABLED); 639 } 640 641 static bool acpiphp_no_hotplug(acpi_handle handle) 642 { 643 struct acpi_device *adev = NULL; 644 645 acpi_bus_get_device(handle, &adev); 646 return adev && adev->flags.no_hotplug; 647 } 648 649 static bool slot_no_hotplug(struct acpiphp_slot *slot) 650 { 651 struct acpiphp_func *func; 652 653 list_for_each_entry(func, &slot->funcs, sibling) 654 if (acpiphp_no_hotplug(func_to_handle(func))) 655 return true; 656 657 return false; 658 } 659 660 /** 661 * get_slot_status - get ACPI slot status 662 * @slot: ACPI PHP slot 663 * 664 * If a slot has _STA for each function and if any one of them 665 * returned non-zero status, return it. 666 * 667 * If a slot doesn't have _STA and if any one of its functions' 668 * configuration space is configured, return 0x0f as a _STA. 669 * 670 * Otherwise return 0. 671 */ 672 static unsigned int get_slot_status(struct acpiphp_slot *slot) 673 { 674 unsigned long long sta = 0; 675 struct acpiphp_func *func; 676 677 list_for_each_entry(func, &slot->funcs, sibling) { 678 if (func->flags & FUNC_HAS_STA) { 679 acpi_status status; 680 681 status = acpi_evaluate_integer(func_to_handle(func), 682 "_STA", NULL, &sta); 683 if (ACPI_SUCCESS(status) && sta) 684 break; 685 } else { 686 u32 dvid; 687 688 pci_bus_read_config_dword(slot->bus, 689 PCI_DEVFN(slot->device, 690 func->function), 691 PCI_VENDOR_ID, &dvid); 692 if (dvid != 0xffffffff) { 693 sta = ACPI_STA_ALL; 694 break; 695 } 696 } 697 } 698 699 return (unsigned int)sta; 700 } 701 702 /** 703 * trim_stale_devices - remove PCI devices that are not responding. 704 * @dev: PCI device to start walking the hierarchy from. 705 */ 706 static void trim_stale_devices(struct pci_dev *dev) 707 { 708 struct acpi_device *adev = ACPI_COMPANION(&dev->dev); 709 struct pci_bus *bus = dev->subordinate; 710 bool alive = false; 711 712 if (adev) { 713 acpi_handle handle = adev->handle; 714 acpi_status status; 715 unsigned long long sta; 716 717 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 718 alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL) 719 || acpiphp_no_hotplug(handle); 720 } 721 if (!alive) { 722 u32 v; 723 724 /* Check if the device responds. */ 725 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); 726 } 727 if (!alive) { 728 pci_stop_and_remove_bus_device(dev); 729 if (adev) 730 acpi_bus_trim(adev); 731 } else if (bus) { 732 struct pci_dev *child, *tmp; 733 734 /* The device is a bridge. so check the bus below it. */ 735 pm_runtime_get_sync(&dev->dev); 736 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) 737 trim_stale_devices(child); 738 739 pm_runtime_put(&dev->dev); 740 } 741 } 742 743 /** 744 * acpiphp_check_bridge - re-enumerate devices 745 * @bridge: where to begin re-enumeration 746 * 747 * Iterate over all slots under this bridge and make sure that if a 748 * card is present they are enabled, and if not they are disabled. 749 */ 750 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 751 { 752 struct acpiphp_slot *slot; 753 754 /* Bail out if the bridge is going away. */ 755 if (bridge->is_going_away) 756 return; 757 758 list_for_each_entry(slot, &bridge->slots, node) { 759 struct pci_bus *bus = slot->bus; 760 struct pci_dev *dev, *tmp; 761 762 mutex_lock(&slot->crit_sect); 763 if (slot_no_hotplug(slot)) { 764 ; /* do nothing */ 765 } else if (get_slot_status(slot) == ACPI_STA_ALL) { 766 /* remove stale devices if any */ 767 list_for_each_entry_safe_reverse(dev, tmp, 768 &bus->devices, bus_list) 769 if (PCI_SLOT(dev->devfn) == slot->device) 770 trim_stale_devices(dev); 771 772 /* configure all functions */ 773 enable_slot(slot); 774 } else { 775 disable_slot(slot); 776 } 777 mutex_unlock(&slot->crit_sect); 778 } 779 } 780 781 static void acpiphp_set_hpp_values(struct pci_bus *bus) 782 { 783 struct pci_dev *dev; 784 785 list_for_each_entry(dev, &bus->devices, bus_list) 786 pci_configure_slot(dev); 787 } 788 789 /* 790 * Remove devices for which we could not assign resources, call 791 * arch specific code to fix-up the bus 792 */ 793 static void acpiphp_sanitize_bus(struct pci_bus *bus) 794 { 795 struct pci_dev *dev, *tmp; 796 int i; 797 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 798 799 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { 800 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 801 struct resource *res = &dev->resource[i]; 802 if ((res->flags & type_mask) && !res->start && 803 res->end) { 804 /* Could not assign a required resources 805 * for this device, remove it */ 806 pci_stop_and_remove_bus_device(dev); 807 break; 808 } 809 } 810 } 811 } 812 813 /* 814 * ACPI event handlers 815 */ 816 817 void acpiphp_check_host_bridge(acpi_handle handle) 818 { 819 struct acpiphp_bridge *bridge; 820 821 bridge = acpiphp_handle_to_bridge(handle); 822 if (bridge) { 823 pci_lock_rescan_remove(); 824 825 acpiphp_check_bridge(bridge); 826 827 pci_unlock_rescan_remove(); 828 put_bridge(bridge); 829 } 830 } 831 832 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); 833 834 static void hotplug_event(acpi_handle handle, u32 type, void *data) 835 { 836 struct acpiphp_context *context = data; 837 struct acpiphp_func *func = &context->func; 838 struct acpiphp_bridge *bridge; 839 char objname[64]; 840 struct acpi_buffer buffer = { .length = sizeof(objname), 841 .pointer = objname }; 842 843 mutex_lock(&acpiphp_context_lock); 844 bridge = context->bridge; 845 if (bridge) 846 get_bridge(bridge); 847 848 mutex_unlock(&acpiphp_context_lock); 849 850 pci_lock_rescan_remove(); 851 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 852 853 switch (type) { 854 case ACPI_NOTIFY_BUS_CHECK: 855 /* bus re-enumerate */ 856 pr_debug("%s: Bus check notify on %s\n", __func__, objname); 857 pr_debug("%s: re-enumerating slots under %s\n", 858 __func__, objname); 859 if (bridge) { 860 acpiphp_check_bridge(bridge); 861 } else { 862 struct acpiphp_slot *slot = func->slot; 863 864 if (slot->flags & SLOT_IS_GOING_AWAY) 865 break; 866 867 mutex_lock(&slot->crit_sect); 868 enable_slot(slot); 869 mutex_unlock(&slot->crit_sect); 870 } 871 break; 872 873 case ACPI_NOTIFY_DEVICE_CHECK: 874 /* device check */ 875 pr_debug("%s: Device check notify on %s\n", __func__, objname); 876 if (bridge) { 877 acpiphp_check_bridge(bridge); 878 } else { 879 struct acpiphp_slot *slot = func->slot; 880 int ret; 881 882 if (slot->flags & SLOT_IS_GOING_AWAY) 883 break; 884 885 /* 886 * Check if anything has changed in the slot and rescan 887 * from the parent if that's the case. 888 */ 889 mutex_lock(&slot->crit_sect); 890 ret = acpiphp_rescan_slot(slot); 891 mutex_unlock(&slot->crit_sect); 892 if (ret) 893 acpiphp_check_bridge(func->parent); 894 } 895 break; 896 897 case ACPI_NOTIFY_EJECT_REQUEST: 898 /* request device eject */ 899 pr_debug("%s: Device eject notify on %s\n", __func__, objname); 900 acpiphp_disable_and_eject_slot(func->slot); 901 break; 902 } 903 904 pci_unlock_rescan_remove(); 905 if (bridge) 906 put_bridge(bridge); 907 } 908 909 static void hotplug_event_work(void *data, u32 type) 910 { 911 struct acpiphp_context *context = data; 912 acpi_handle handle = context->handle; 913 914 acpi_scan_lock_acquire(); 915 916 hotplug_event(handle, type, context); 917 918 acpi_scan_lock_release(); 919 acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL); 920 put_bridge(context->func.parent); 921 } 922 923 /** 924 * handle_hotplug_event - handle ACPI hotplug event 925 * @handle: Notify()'ed acpi_handle 926 * @type: Notify code 927 * @data: pointer to acpiphp_context structure 928 * 929 * Handles ACPI event notification on slots. 930 */ 931 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 932 { 933 struct acpiphp_context *context; 934 u32 ost_code = ACPI_OST_SC_SUCCESS; 935 acpi_status status; 936 937 switch (type) { 938 case ACPI_NOTIFY_BUS_CHECK: 939 case ACPI_NOTIFY_DEVICE_CHECK: 940 break; 941 case ACPI_NOTIFY_EJECT_REQUEST: 942 ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS; 943 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 944 break; 945 946 case ACPI_NOTIFY_DEVICE_WAKE: 947 return; 948 949 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 950 acpi_handle_err(handle, "Device cannot be configured due " 951 "to a frequency mismatch\n"); 952 goto out; 953 954 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 955 acpi_handle_err(handle, "Device cannot be configured due " 956 "to a bus mode mismatch\n"); 957 goto out; 958 959 case ACPI_NOTIFY_POWER_FAULT: 960 acpi_handle_err(handle, "Device has suffered a power fault\n"); 961 goto out; 962 963 default: 964 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); 965 ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; 966 goto out; 967 } 968 969 mutex_lock(&acpiphp_context_lock); 970 context = acpiphp_get_context(handle); 971 if (!context || WARN_ON(context->handle != handle) 972 || context->func.parent->is_going_away) 973 goto err_out; 974 975 get_bridge(context->func.parent); 976 acpiphp_put_context(context); 977 status = acpi_hotplug_execute(hotplug_event_work, context, type); 978 if (ACPI_SUCCESS(status)) { 979 mutex_unlock(&acpiphp_context_lock); 980 return; 981 } 982 put_bridge(context->func.parent); 983 984 err_out: 985 mutex_unlock(&acpiphp_context_lock); 986 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 987 988 out: 989 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 990 } 991 992 /** 993 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. 994 * @bus: PCI bus to enumerate the slots for. 995 * 996 * A "slot" is an object associated with a PCI device number. All functions 997 * (PCI devices) with the same bus and device number belong to the same slot. 998 */ 999 void acpiphp_enumerate_slots(struct pci_bus *bus) 1000 { 1001 struct acpiphp_bridge *bridge; 1002 acpi_handle handle; 1003 acpi_status status; 1004 1005 if (acpiphp_disabled) 1006 return; 1007 1008 handle = ACPI_HANDLE(bus->bridge); 1009 if (!handle) 1010 return; 1011 1012 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 1013 if (!bridge) { 1014 acpi_handle_err(handle, "No memory for bridge object\n"); 1015 return; 1016 } 1017 1018 INIT_LIST_HEAD(&bridge->slots); 1019 kref_init(&bridge->ref); 1020 bridge->pci_dev = pci_dev_get(bus->self); 1021 bridge->pci_bus = bus; 1022 1023 /* 1024 * Grab a ref to the subordinate PCI bus in case the bus is 1025 * removed via PCI core logical hotplug. The ref pins the bus 1026 * (which we access during module unload). 1027 */ 1028 get_device(&bus->dev); 1029 1030 if (!pci_is_root_bus(bridge->pci_bus)) { 1031 struct acpiphp_context *context; 1032 1033 /* 1034 * This bridge should have been registered as a hotplug function 1035 * under its parent, so the context should be there, unless the 1036 * parent is going to be handled by pciehp, in which case this 1037 * bridge is not interesting to us either. 1038 */ 1039 mutex_lock(&acpiphp_context_lock); 1040 context = acpiphp_get_context(handle); 1041 if (!context) { 1042 mutex_unlock(&acpiphp_context_lock); 1043 put_device(&bus->dev); 1044 pci_dev_put(bridge->pci_dev); 1045 kfree(bridge); 1046 return; 1047 } 1048 bridge->context = context; 1049 context->bridge = bridge; 1050 /* Get a reference to the parent bridge. */ 1051 get_bridge(context->func.parent); 1052 mutex_unlock(&acpiphp_context_lock); 1053 } 1054 1055 /* must be added to the list prior to calling register_slot */ 1056 mutex_lock(&bridge_mutex); 1057 list_add(&bridge->list, &bridge_list); 1058 mutex_unlock(&bridge_mutex); 1059 1060 /* register all slot objects under this bridge */ 1061 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 1062 register_slot, NULL, bridge, NULL); 1063 if (ACPI_FAILURE(status)) { 1064 acpi_handle_err(handle, "failed to register slots\n"); 1065 cleanup_bridge(bridge); 1066 put_bridge(bridge); 1067 } 1068 } 1069 1070 /** 1071 * acpiphp_remove_slots - Remove slot objects associated with a given bus. 1072 * @bus: PCI bus to remove the slot objects for. 1073 */ 1074 void acpiphp_remove_slots(struct pci_bus *bus) 1075 { 1076 struct acpiphp_bridge *bridge; 1077 1078 if (acpiphp_disabled) 1079 return; 1080 1081 mutex_lock(&bridge_mutex); 1082 list_for_each_entry(bridge, &bridge_list, list) 1083 if (bridge->pci_bus == bus) { 1084 mutex_unlock(&bridge_mutex); 1085 cleanup_bridge(bridge); 1086 put_bridge(bridge); 1087 return; 1088 } 1089 1090 mutex_unlock(&bridge_mutex); 1091 } 1092 1093 /** 1094 * acpiphp_enable_slot - power on slot 1095 * @slot: ACPI PHP slot 1096 */ 1097 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1098 { 1099 pci_lock_rescan_remove(); 1100 1101 if (slot->flags & SLOT_IS_GOING_AWAY) 1102 return -ENODEV; 1103 1104 mutex_lock(&slot->crit_sect); 1105 /* configure all functions */ 1106 if (!(slot->flags & SLOT_ENABLED)) 1107 enable_slot(slot); 1108 1109 mutex_unlock(&slot->crit_sect); 1110 1111 pci_unlock_rescan_remove(); 1112 return 0; 1113 } 1114 1115 /** 1116 * acpiphp_disable_and_eject_slot - power off and eject slot 1117 * @slot: ACPI PHP slot 1118 */ 1119 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1120 { 1121 struct acpiphp_func *func; 1122 1123 if (slot->flags & SLOT_IS_GOING_AWAY) 1124 return -ENODEV; 1125 1126 mutex_lock(&slot->crit_sect); 1127 1128 /* unconfigure all functions */ 1129 disable_slot(slot); 1130 1131 list_for_each_entry(func, &slot->funcs, sibling) 1132 if (func->flags & FUNC_HAS_EJ0) { 1133 acpi_handle handle = func_to_handle(func); 1134 1135 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1136 acpi_handle_err(handle, "_EJ0 failed\n"); 1137 1138 break; 1139 } 1140 1141 mutex_unlock(&slot->crit_sect); 1142 return 0; 1143 } 1144 1145 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1146 { 1147 int ret; 1148 1149 pci_lock_rescan_remove(); 1150 ret = acpiphp_disable_and_eject_slot(slot); 1151 pci_unlock_rescan_remove(); 1152 return ret; 1153 } 1154 1155 /* 1156 * slot enabled: 1 1157 * slot disabled: 0 1158 */ 1159 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1160 { 1161 return (slot->flags & SLOT_ENABLED); 1162 } 1163 1164 /* 1165 * latch open: 1 1166 * latch closed: 0 1167 */ 1168 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1169 { 1170 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1171 } 1172 1173 /* 1174 * adapter presence : 1 1175 * absence : 0 1176 */ 1177 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1178 { 1179 return !!get_slot_status(slot); 1180 } 1181