1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 4 * 5 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 6 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 7 * Copyright (C) 2002,2003 NEC Corporation 8 * Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org) 9 * Copyright (C) 2003-2005 Hewlett Packard 10 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 11 * Copyright (C) 2005 Intel Corporation 12 * 13 * All rights reserved. 14 * 15 * Send feedback to <kristen.c.accardi@intel.com> 16 * 17 */ 18 19/* 20 * Lifetime rules for pci_dev: 21 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 22 * when the bridge is scanned and it loses a refcount when the bridge 23 * is removed. 24 * - When a P2P bridge is present, we elevate the refcount on the subordinate 25 * bus. It loses the refcount when the the driver unloads. 26 */ 27 28#define pr_fmt(fmt) "acpiphp_glue: " fmt 29 30#include <linux/module.h> 31 32#include <linux/kernel.h> 33#include <linux/pci.h> 34#include <linux/pci_hotplug.h> 35#include <linux/pci-acpi.h> 36#include <linux/pm_runtime.h> 37#include <linux/mutex.h> 38#include <linux/slab.h> 39#include <linux/acpi.h> 40 41#include "../pci.h" 42#include "acpiphp.h" 43 44static LIST_HEAD(bridge_list); 45static DEFINE_MUTEX(bridge_mutex); 46 47static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type); 48static void acpiphp_post_dock_fixup(struct acpi_device *adev); 49static void acpiphp_sanitize_bus(struct pci_bus *bus); 50static void hotplug_event(u32 type, struct acpiphp_context *context); 51static void free_bridge(struct kref *kref); 52 53/** 54 * acpiphp_init_context - Create hotplug context and grab a reference to it. 55 * @adev: ACPI device object to create the context for. 56 * 57 * Call under acpi_hp_context_lock. 58 */ 59static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev) 60{ 61 struct acpiphp_context *context; 62 63 context = kzalloc(sizeof(*context), GFP_KERNEL); 64 if (!context) 65 return NULL; 66 67 context->refcount = 1; 68 context->hp.notify = acpiphp_hotplug_notify; 69 context->hp.fixup = acpiphp_post_dock_fixup; 70 acpi_set_hp_context(adev, &context->hp); 71 return context; 72} 73 74/** 75 * acpiphp_get_context - Get hotplug context and grab a reference to it. 76 * @adev: ACPI device object to get the context for. 77 * 78 * Call under acpi_hp_context_lock. 79 */ 80static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev) 81{ 82 struct acpiphp_context *context; 83 84 if (!adev->hp) 85 return NULL; 86 87 context = to_acpiphp_context(adev->hp); 88 context->refcount++; 89 return context; 90} 91 92/** 93 * acpiphp_put_context - Drop a reference to ACPI hotplug context. 94 * @context: ACPI hotplug context to drop a reference to. 95 * 96 * The context object is removed if there are no more references to it. 97 * 98 * Call under acpi_hp_context_lock. 99 */ 100static void acpiphp_put_context(struct acpiphp_context *context) 101{ 102 if (--context->refcount) 103 return; 104 105 WARN_ON(context->bridge); 106 context->hp.self->hp = NULL; 107 kfree(context); 108} 109 110static inline void get_bridge(struct acpiphp_bridge *bridge) 111{ 112 kref_get(&bridge->ref); 113} 114 115static inline void put_bridge(struct acpiphp_bridge *bridge) 116{ 117 kref_put(&bridge->ref, free_bridge); 118} 119 120static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev) 121{ 122 struct acpiphp_context *context; 123 124 acpi_lock_hp_context(); 125 126 context = acpiphp_get_context(adev); 127 if (!context) 128 goto unlock; 129 130 if (context->func.parent->is_going_away) { 131 acpiphp_put_context(context); 132 context = NULL; 133 goto unlock; 134 } 135 136 get_bridge(context->func.parent); 137 acpiphp_put_context(context); 138 139unlock: 140 acpi_unlock_hp_context(); 141 return context; 142} 143 144static void acpiphp_let_context_go(struct acpiphp_context *context) 145{ 146 put_bridge(context->func.parent); 147} 148 149static void free_bridge(struct kref *kref) 150{ 151 struct acpiphp_context *context; 152 struct acpiphp_bridge *bridge; 153 struct acpiphp_slot *slot, *next; 154 struct acpiphp_func *func, *tmp; 155 156 acpi_lock_hp_context(); 157 158 bridge = container_of(kref, struct acpiphp_bridge, ref); 159 160 list_for_each_entry_safe(slot, next, &bridge->slots, node) { 161 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) 162 acpiphp_put_context(func_to_context(func)); 163 164 kfree(slot); 165 } 166 167 context = bridge->context; 168 /* Root bridges will not have hotplug context. */ 169 if (context) { 170 /* Release the reference taken by acpiphp_enumerate_slots(). */ 171 put_bridge(context->func.parent); 172 context->bridge = NULL; 173 acpiphp_put_context(context); 174 } 175 176 put_device(&bridge->pci_bus->dev); 177 pci_dev_put(bridge->pci_dev); 178 kfree(bridge); 179 180 acpi_unlock_hp_context(); 181} 182 183/** 184 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices. 185 * @adev: ACPI device object corresponding to a PCI device. 186 * 187 * TBD - figure out a way to only call fixups for systems that require them. 188 */ 189static void acpiphp_post_dock_fixup(struct acpi_device *adev) 190{ 191 struct acpiphp_context *context = acpiphp_grab_context(adev); 192 struct pci_bus *bus; 193 u32 buses; 194 195 if (!context) 196 return; 197 198 bus = context->func.slot->bus; 199 if (!bus->self) 200 goto out; 201 202 /* fixup bad _DCK function that rewrites 203 * secondary bridge on slot 204 */ 205 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses); 206 207 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 208 buses = (buses & 0xff000000) 209 | ((unsigned int)(bus->primary) << 0) 210 | ((unsigned int)(bus->busn_res.start) << 8) 211 | ((unsigned int)(bus->busn_res.end) << 16); 212 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 213 } 214 215 out: 216 acpiphp_let_context_go(context); 217} 218 219/** 220 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object. 221 * @handle: ACPI handle of the object to add a context to. 222 * @lvl: Not used. 223 * @data: The object's parent ACPIPHP bridge. 224 * @rv: Not used. 225 */ 226static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, 227 void **rv) 228{ 229 struct acpiphp_bridge *bridge = data; 230 struct acpiphp_context *context; 231 struct acpi_device *adev; 232 struct acpiphp_slot *slot; 233 struct acpiphp_func *newfunc; 234 acpi_status status = AE_OK; 235 unsigned long long adr; 236 int device, function; 237 struct pci_bus *pbus = bridge->pci_bus; 238 struct pci_dev *pdev = bridge->pci_dev; 239 u32 val; 240 241 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 242 if (ACPI_FAILURE(status)) { 243 if (status != AE_NOT_FOUND) 244 acpi_handle_warn(handle, 245 "can't evaluate _ADR (%#x)\n", status); 246 return AE_OK; 247 } 248 if (acpi_bus_get_device(handle, &adev)) 249 return AE_OK; 250 251 device = (adr >> 16) & 0xffff; 252 function = adr & 0xffff; 253 254 acpi_lock_hp_context(); 255 context = acpiphp_init_context(adev); 256 if (!context) { 257 acpi_unlock_hp_context(); 258 acpi_handle_err(handle, "No hotplug context\n"); 259 return AE_NOT_EXIST; 260 } 261 newfunc = &context->func; 262 newfunc->function = function; 263 newfunc->parent = bridge; 264 acpi_unlock_hp_context(); 265 266 /* 267 * If this is a dock device, its _EJ0 should be executed by the dock 268 * notify handler after calling _DCK. 269 */ 270 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0")) 271 newfunc->flags = FUNC_HAS_EJ0; 272 273 if (acpi_has_method(handle, "_STA")) 274 newfunc->flags |= FUNC_HAS_STA; 275 276 /* search for objects that share the same slot */ 277 list_for_each_entry(slot, &bridge->slots, node) 278 if (slot->device == device) 279 goto slot_found; 280 281 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 282 if (!slot) { 283 acpi_lock_hp_context(); 284 acpiphp_put_context(context); 285 acpi_unlock_hp_context(); 286 return AE_NO_MEMORY; 287 } 288 289 slot->bus = bridge->pci_bus; 290 slot->device = device; 291 INIT_LIST_HEAD(&slot->funcs); 292 293 list_add_tail(&slot->node, &bridge->slots); 294 295 /* 296 * Expose slots to user space for functions that have _EJ0 or _RMV or 297 * are located in dock stations. Do not expose them for devices handled 298 * by the native PCIe hotplug (PCIeHP) or standard PCI hotplug 299 * (SHPCHP), because that code is supposed to expose slots to user 300 * space in those cases. 301 */ 302 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev)) 303 && !(pdev && hotplug_is_native(pdev))) { 304 unsigned long long sun; 305 int retval; 306 307 bridge->nr_slots++; 308 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 309 if (ACPI_FAILURE(status)) 310 sun = bridge->nr_slots; 311 312 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 313 sun, pci_domain_nr(pbus), pbus->number, device); 314 315 retval = acpiphp_register_hotplug_slot(slot, sun); 316 if (retval) { 317 slot->slot = NULL; 318 bridge->nr_slots--; 319 if (retval == -EBUSY) 320 pr_warn("Slot %llu already registered by another hotplug driver\n", sun); 321 else 322 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval); 323 } 324 /* Even if the slot registration fails, we can still use it. */ 325 } 326 327 slot_found: 328 newfunc->slot = slot; 329 list_add_tail(&newfunc->sibling, &slot->funcs); 330 331 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 332 &val, 60*1000)) 333 slot->flags |= SLOT_ENABLED; 334 335 return AE_OK; 336} 337 338static void cleanup_bridge(struct acpiphp_bridge *bridge) 339{ 340 struct acpiphp_slot *slot; 341 struct acpiphp_func *func; 342 343 list_for_each_entry(slot, &bridge->slots, node) { 344 list_for_each_entry(func, &slot->funcs, sibling) { 345 struct acpi_device *adev = func_to_acpi_device(func); 346 347 acpi_lock_hp_context(); 348 adev->hp->notify = NULL; 349 adev->hp->fixup = NULL; 350 acpi_unlock_hp_context(); 351 } 352 slot->flags |= SLOT_IS_GOING_AWAY; 353 if (slot->slot) 354 acpiphp_unregister_hotplug_slot(slot); 355 } 356 357 mutex_lock(&bridge_mutex); 358 list_del(&bridge->list); 359 mutex_unlock(&bridge_mutex); 360 361 acpi_lock_hp_context(); 362 bridge->is_going_away = true; 363 acpi_unlock_hp_context(); 364} 365 366/** 367 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 368 * @bus: bus to start search with 369 */ 370static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 371{ 372 struct pci_bus *tmp; 373 unsigned char max, n; 374 375 /* 376 * pci_bus_max_busnr will return the highest 377 * reserved busnr for all these children. 378 * that is equivalent to the bus->subordinate 379 * value. We don't want to use the parent's 380 * bus->subordinate value because it could have 381 * padding in it. 382 */ 383 max = bus->busn_res.start; 384 385 list_for_each_entry(tmp, &bus->children, node) { 386 n = pci_bus_max_busnr(tmp); 387 if (n > max) 388 max = n; 389 } 390 return max; 391} 392 393static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 394{ 395 struct acpiphp_func *func; 396 397 list_for_each_entry(func, &slot->funcs, sibling) { 398 /* _REG is optional, we don't care about if there is failure */ 399 acpi_evaluate_reg(func_to_handle(func), 400 ACPI_ADR_SPACE_PCI_CONFIG, 401 ACPI_REG_CONNECT); 402 } 403} 404 405static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 406{ 407 struct acpiphp_func *func; 408 409 /* quirk, or pcie could set it already */ 410 if (dev->is_hotplug_bridge) 411 return; 412 413 list_for_each_entry(func, &slot->funcs, sibling) { 414 if (PCI_FUNC(dev->devfn) == func->function) { 415 dev->is_hotplug_bridge = 1; 416 break; 417 } 418 } 419} 420 421static int acpiphp_rescan_slot(struct acpiphp_slot *slot) 422{ 423 struct acpiphp_func *func; 424 425 list_for_each_entry(func, &slot->funcs, sibling) { 426 struct acpi_device *adev = func_to_acpi_device(func); 427 428 acpi_bus_scan(adev->handle); 429 if (acpi_device_enumerated(adev)) 430 acpi_device_set_power(adev, ACPI_STATE_D0); 431 } 432 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); 433} 434 435static void acpiphp_native_scan_bridge(struct pci_dev *bridge) 436{ 437 struct pci_bus *bus = bridge->subordinate; 438 struct pci_dev *dev; 439 int max; 440 441 if (!bus) 442 return; 443 444 max = bus->busn_res.start; 445 /* Scan already configured non-hotplug bridges */ 446 for_each_pci_bridge(dev, bus) { 447 if (!hotplug_is_native(dev)) 448 max = pci_scan_bridge(bus, dev, max, 0); 449 } 450 451 /* Scan non-hotplug bridges that need to be reconfigured */ 452 for_each_pci_bridge(dev, bus) { 453 if (hotplug_is_native(dev)) 454 continue; 455 456 max = pci_scan_bridge(bus, dev, max, 1); 457 if (dev->subordinate) { 458 pcibios_resource_survey_bus(dev->subordinate); 459 pci_bus_size_bridges(dev->subordinate); 460 pci_bus_assign_resources(dev->subordinate); 461 } 462 } 463} 464 465/** 466 * enable_slot - enable, configure a slot 467 * @slot: slot to be enabled 468 * @bridge: true if enable is for the whole bridge (not a single slot) 469 * 470 * This function should be called per *physical slot*, 471 * not per each slot object in ACPI namespace. 472 */ 473static void enable_slot(struct acpiphp_slot *slot, bool bridge) 474{ 475 struct pci_dev *dev; 476 struct pci_bus *bus = slot->bus; 477 struct acpiphp_func *func; 478 479 if (bridge && bus->self && hotplug_is_native(bus->self)) { 480 /* 481 * If native hotplug is used, it will take care of hotplug 482 * slot management and resource allocation for hotplug 483 * bridges. However, ACPI hotplug may still be used for 484 * non-hotplug bridges to bring in additional devices such 485 * as a Thunderbolt host controller. 486 */ 487 for_each_pci_bridge(dev, bus) { 488 if (PCI_SLOT(dev->devfn) == slot->device) 489 acpiphp_native_scan_bridge(dev); 490 } 491 } else { 492 LIST_HEAD(add_list); 493 int max, pass; 494 495 acpiphp_rescan_slot(slot); 496 max = acpiphp_max_busnr(bus); 497 for (pass = 0; pass < 2; pass++) { 498 for_each_pci_bridge(dev, bus) { 499 if (PCI_SLOT(dev->devfn) != slot->device) 500 continue; 501 502 max = pci_scan_bridge(bus, dev, max, pass); 503 if (pass && dev->subordinate) { 504 check_hotplug_bridge(slot, dev); 505 pcibios_resource_survey_bus(dev->subordinate); 506 __pci_bus_size_bridges(dev->subordinate, 507 &add_list); 508 } 509 } 510 } 511 __pci_bus_assign_resources(bus, &add_list, NULL); 512 } 513 514 acpiphp_sanitize_bus(bus); 515 pcie_bus_configure_settings(bus); 516 acpiphp_set_acpi_region(slot); 517 518 list_for_each_entry(dev, &bus->devices, bus_list) { 519 /* Assume that newly added devices are powered on already. */ 520 if (!pci_dev_is_added(dev)) 521 dev->current_state = PCI_D0; 522 } 523 524 pci_bus_add_devices(bus); 525 526 slot->flags |= SLOT_ENABLED; 527 list_for_each_entry(func, &slot->funcs, sibling) { 528 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 529 func->function)); 530 if (!dev) { 531 /* Do not set SLOT_ENABLED flag if some funcs 532 are not added. */ 533 slot->flags &= ~SLOT_ENABLED; 534 continue; 535 } 536 pci_dev_put(dev); 537 } 538} 539 540/** 541 * disable_slot - disable a slot 542 * @slot: ACPI PHP slot 543 */ 544static void disable_slot(struct acpiphp_slot *slot) 545{ 546 struct pci_bus *bus = slot->bus; 547 struct pci_dev *dev, *prev; 548 struct acpiphp_func *func; 549 550 /* 551 * enable_slot() enumerates all functions in this device via 552 * pci_scan_slot(), whether they have associated ACPI hotplug 553 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 554 * here. 555 */ 556 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) 557 if (PCI_SLOT(dev->devfn) == slot->device) 558 pci_stop_and_remove_bus_device(dev); 559 560 list_for_each_entry(func, &slot->funcs, sibling) 561 acpi_bus_trim(func_to_acpi_device(func)); 562 563 slot->flags &= ~SLOT_ENABLED; 564} 565 566static bool slot_no_hotplug(struct acpiphp_slot *slot) 567{ 568 struct pci_bus *bus = slot->bus; 569 struct pci_dev *dev; 570 571 list_for_each_entry(dev, &bus->devices, bus_list) { 572 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug) 573 return true; 574 } 575 return false; 576} 577 578/** 579 * get_slot_status - get ACPI slot status 580 * @slot: ACPI PHP slot 581 * 582 * If a slot has _STA for each function and if any one of them 583 * returned non-zero status, return it. 584 * 585 * If a slot doesn't have _STA and if any one of its functions' 586 * configuration space is configured, return 0x0f as a _STA. 587 * 588 * Otherwise return 0. 589 */ 590static unsigned int get_slot_status(struct acpiphp_slot *slot) 591{ 592 unsigned long long sta = 0; 593 struct acpiphp_func *func; 594 u32 dvid; 595 596 list_for_each_entry(func, &slot->funcs, sibling) { 597 if (func->flags & FUNC_HAS_STA) { 598 acpi_status status; 599 600 status = acpi_evaluate_integer(func_to_handle(func), 601 "_STA", NULL, &sta); 602 if (ACPI_SUCCESS(status) && sta) 603 break; 604 } else { 605 if (pci_bus_read_dev_vendor_id(slot->bus, 606 PCI_DEVFN(slot->device, func->function), 607 &dvid, 0)) { 608 sta = ACPI_STA_ALL; 609 break; 610 } 611 } 612 } 613 614 if (!sta) { 615 /* 616 * Check for the slot itself since it may be that the 617 * ACPI slot is a device below PCIe upstream port so in 618 * that case it may not even be reachable yet. 619 */ 620 if (pci_bus_read_dev_vendor_id(slot->bus, 621 PCI_DEVFN(slot->device, 0), &dvid, 0)) { 622 sta = ACPI_STA_ALL; 623 } 624 } 625 626 return (unsigned int)sta; 627} 628 629static inline bool device_status_valid(unsigned int sta) 630{ 631 /* 632 * ACPI spec says that _STA may return bit 0 clear with bit 3 set 633 * if the device is valid but does not require a device driver to be 634 * loaded (Section 6.3.7 of ACPI 5.0A). 635 */ 636 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING; 637 return (sta & mask) == mask; 638} 639 640/** 641 * trim_stale_devices - remove PCI devices that are not responding. 642 * @dev: PCI device to start walking the hierarchy from. 643 */ 644static void trim_stale_devices(struct pci_dev *dev) 645{ 646 struct acpi_device *adev = ACPI_COMPANION(&dev->dev); 647 struct pci_bus *bus = dev->subordinate; 648 bool alive = dev->ignore_hotplug; 649 650 if (adev) { 651 acpi_status status; 652 unsigned long long sta; 653 654 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); 655 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta)); 656 } 657 if (!alive) 658 alive = pci_device_is_present(dev); 659 660 if (!alive) { 661 pci_dev_set_disconnected(dev, NULL); 662 if (pci_has_subordinate(dev)) 663 pci_walk_bus(dev->subordinate, pci_dev_set_disconnected, 664 NULL); 665 666 pci_stop_and_remove_bus_device(dev); 667 if (adev) 668 acpi_bus_trim(adev); 669 } else if (bus) { 670 struct pci_dev *child, *tmp; 671 672 /* The device is a bridge. so check the bus below it. */ 673 pm_runtime_get_sync(&dev->dev); 674 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) 675 trim_stale_devices(child); 676 677 pm_runtime_put(&dev->dev); 678 } 679} 680 681/** 682 * acpiphp_check_bridge - re-enumerate devices 683 * @bridge: where to begin re-enumeration 684 * 685 * Iterate over all slots under this bridge and make sure that if a 686 * card is present they are enabled, and if not they are disabled. 687 */ 688static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 689{ 690 struct acpiphp_slot *slot; 691 692 /* Bail out if the bridge is going away. */ 693 if (bridge->is_going_away) 694 return; 695 696 if (bridge->pci_dev) 697 pm_runtime_get_sync(&bridge->pci_dev->dev); 698 699 list_for_each_entry(slot, &bridge->slots, node) { 700 struct pci_bus *bus = slot->bus; 701 struct pci_dev *dev, *tmp; 702 703 if (slot_no_hotplug(slot)) { 704 ; /* do nothing */ 705 } else if (device_status_valid(get_slot_status(slot))) { 706 /* remove stale devices if any */ 707 list_for_each_entry_safe_reverse(dev, tmp, 708 &bus->devices, bus_list) 709 if (PCI_SLOT(dev->devfn) == slot->device) 710 trim_stale_devices(dev); 711 712 /* configure all functions */ 713 enable_slot(slot, true); 714 } else { 715 disable_slot(slot); 716 } 717 } 718 719 if (bridge->pci_dev) 720 pm_runtime_put(&bridge->pci_dev->dev); 721} 722 723/* 724 * Remove devices for which we could not assign resources, call 725 * arch specific code to fix-up the bus 726 */ 727static void acpiphp_sanitize_bus(struct pci_bus *bus) 728{ 729 struct pci_dev *dev, *tmp; 730 int i; 731 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 732 733 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { 734 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) { 735 struct resource *res = &dev->resource[i]; 736 if ((res->flags & type_mask) && !res->start && 737 res->end) { 738 /* Could not assign a required resources 739 * for this device, remove it */ 740 pci_stop_and_remove_bus_device(dev); 741 break; 742 } 743 } 744 } 745} 746 747/* 748 * ACPI event handlers 749 */ 750 751void acpiphp_check_host_bridge(struct acpi_device *adev) 752{ 753 struct acpiphp_bridge *bridge = NULL; 754 755 acpi_lock_hp_context(); 756 if (adev->hp) { 757 bridge = to_acpiphp_root_context(adev->hp)->root_bridge; 758 if (bridge) 759 get_bridge(bridge); 760 } 761 acpi_unlock_hp_context(); 762 if (bridge) { 763 pci_lock_rescan_remove(); 764 765 acpiphp_check_bridge(bridge); 766 767 pci_unlock_rescan_remove(); 768 put_bridge(bridge); 769 } 770} 771 772static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); 773 774static void hotplug_event(u32 type, struct acpiphp_context *context) 775{ 776 acpi_handle handle = context->hp.self->handle; 777 struct acpiphp_func *func = &context->func; 778 struct acpiphp_slot *slot = func->slot; 779 struct acpiphp_bridge *bridge; 780 781 acpi_lock_hp_context(); 782 bridge = context->bridge; 783 if (bridge) 784 get_bridge(bridge); 785 786 acpi_unlock_hp_context(); 787 788 pci_lock_rescan_remove(); 789 790 switch (type) { 791 case ACPI_NOTIFY_BUS_CHECK: 792 /* bus re-enumerate */ 793 acpi_handle_debug(handle, "Bus check in %s()\n", __func__); 794 if (bridge) 795 acpiphp_check_bridge(bridge); 796 else if (!(slot->flags & SLOT_IS_GOING_AWAY)) 797 enable_slot(slot, false); 798 799 break; 800 801 case ACPI_NOTIFY_DEVICE_CHECK: 802 /* device check */ 803 acpi_handle_debug(handle, "Device check in %s()\n", __func__); 804 if (bridge) { 805 acpiphp_check_bridge(bridge); 806 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) { 807 /* 808 * Check if anything has changed in the slot and rescan 809 * from the parent if that's the case. 810 */ 811 if (acpiphp_rescan_slot(slot)) 812 acpiphp_check_bridge(func->parent); 813 } 814 break; 815 816 case ACPI_NOTIFY_EJECT_REQUEST: 817 /* request device eject */ 818 acpi_handle_debug(handle, "Eject request in %s()\n", __func__); 819 acpiphp_disable_and_eject_slot(slot); 820 break; 821 } 822 823 pci_unlock_rescan_remove(); 824 if (bridge) 825 put_bridge(bridge); 826} 827 828static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) 829{ 830 struct acpiphp_context *context; 831 832 context = acpiphp_grab_context(adev); 833 if (!context) 834 return -ENODATA; 835 836 hotplug_event(type, context); 837 acpiphp_let_context_go(context); 838 return 0; 839} 840 841/** 842 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. 843 * @bus: PCI bus to enumerate the slots for. 844 * 845 * A "slot" is an object associated with a PCI device number. All functions 846 * (PCI devices) with the same bus and device number belong to the same slot. 847 */ 848void acpiphp_enumerate_slots(struct pci_bus *bus) 849{ 850 struct acpiphp_bridge *bridge; 851 struct acpi_device *adev; 852 acpi_handle handle; 853 acpi_status status; 854 855 if (acpiphp_disabled) 856 return; 857 858 adev = ACPI_COMPANION(bus->bridge); 859 if (!adev) 860 return; 861 862 handle = adev->handle; 863 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 864 if (!bridge) 865 return; 866 867 INIT_LIST_HEAD(&bridge->slots); 868 kref_init(&bridge->ref); 869 bridge->pci_dev = pci_dev_get(bus->self); 870 bridge->pci_bus = bus; 871 872 /* 873 * Grab a ref to the subordinate PCI bus in case the bus is 874 * removed via PCI core logical hotplug. The ref pins the bus 875 * (which we access during module unload). 876 */ 877 get_device(&bus->dev); 878 879 acpi_lock_hp_context(); 880 if (pci_is_root_bus(bridge->pci_bus)) { 881 struct acpiphp_root_context *root_context; 882 883 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL); 884 if (!root_context) 885 goto err; 886 887 root_context->root_bridge = bridge; 888 acpi_set_hp_context(adev, &root_context->hp); 889 } else { 890 struct acpiphp_context *context; 891 892 /* 893 * This bridge should have been registered as a hotplug function 894 * under its parent, so the context should be there, unless the 895 * parent is going to be handled by pciehp, in which case this 896 * bridge is not interesting to us either. 897 */ 898 context = acpiphp_get_context(adev); 899 if (!context) 900 goto err; 901 902 bridge->context = context; 903 context->bridge = bridge; 904 /* Get a reference to the parent bridge. */ 905 get_bridge(context->func.parent); 906 } 907 acpi_unlock_hp_context(); 908 909 /* Must be added to the list prior to calling acpiphp_add_context(). */ 910 mutex_lock(&bridge_mutex); 911 list_add(&bridge->list, &bridge_list); 912 mutex_unlock(&bridge_mutex); 913 914 /* register all slot objects under this bridge */ 915 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 916 acpiphp_add_context, NULL, bridge, NULL); 917 if (ACPI_FAILURE(status)) { 918 acpi_handle_err(handle, "failed to register slots\n"); 919 cleanup_bridge(bridge); 920 put_bridge(bridge); 921 } 922 return; 923 924 err: 925 acpi_unlock_hp_context(); 926 put_device(&bus->dev); 927 pci_dev_put(bridge->pci_dev); 928 kfree(bridge); 929} 930 931static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge) 932{ 933 if (pci_is_root_bus(bridge->pci_bus)) { 934 struct acpiphp_root_context *root_context; 935 struct acpi_device *adev; 936 937 acpi_lock_hp_context(); 938 adev = ACPI_COMPANION(bridge->pci_bus->bridge); 939 root_context = to_acpiphp_root_context(adev->hp); 940 adev->hp = NULL; 941 acpi_unlock_hp_context(); 942 kfree(root_context); 943 } 944 cleanup_bridge(bridge); 945 put_bridge(bridge); 946} 947 948/** 949 * acpiphp_remove_slots - Remove slot objects associated with a given bus. 950 * @bus: PCI bus to remove the slot objects for. 951 */ 952void acpiphp_remove_slots(struct pci_bus *bus) 953{ 954 struct acpiphp_bridge *bridge; 955 956 if (acpiphp_disabled) 957 return; 958 959 mutex_lock(&bridge_mutex); 960 list_for_each_entry(bridge, &bridge_list, list) 961 if (bridge->pci_bus == bus) { 962 mutex_unlock(&bridge_mutex); 963 acpiphp_drop_bridge(bridge); 964 return; 965 } 966 967 mutex_unlock(&bridge_mutex); 968} 969 970/** 971 * acpiphp_enable_slot - power on slot 972 * @slot: ACPI PHP slot 973 */ 974int acpiphp_enable_slot(struct acpiphp_slot *slot) 975{ 976 pci_lock_rescan_remove(); 977 978 if (slot->flags & SLOT_IS_GOING_AWAY) { 979 pci_unlock_rescan_remove(); 980 return -ENODEV; 981 } 982 983 /* configure all functions */ 984 if (!(slot->flags & SLOT_ENABLED)) 985 enable_slot(slot, false); 986 987 pci_unlock_rescan_remove(); 988 return 0; 989} 990 991/** 992 * acpiphp_disable_and_eject_slot - power off and eject slot 993 * @slot: ACPI PHP slot 994 */ 995static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 996{ 997 struct acpiphp_func *func; 998 999 if (slot->flags & SLOT_IS_GOING_AWAY) 1000 return -ENODEV; 1001 1002 /* unconfigure all functions */ 1003 disable_slot(slot); 1004 1005 list_for_each_entry(func, &slot->funcs, sibling) 1006 if (func->flags & FUNC_HAS_EJ0) { 1007 acpi_handle handle = func_to_handle(func); 1008 1009 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1010 acpi_handle_err(handle, "_EJ0 failed\n"); 1011 1012 break; 1013 } 1014 1015 return 0; 1016} 1017 1018int acpiphp_disable_slot(struct acpiphp_slot *slot) 1019{ 1020 int ret; 1021 1022 /* 1023 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in 1024 * acpiphp_disable_and_eject_slot() will be synchronized properly. 1025 */ 1026 acpi_scan_lock_acquire(); 1027 pci_lock_rescan_remove(); 1028 ret = acpiphp_disable_and_eject_slot(slot); 1029 pci_unlock_rescan_remove(); 1030 acpi_scan_lock_release(); 1031 return ret; 1032} 1033 1034/* 1035 * slot enabled: 1 1036 * slot disabled: 0 1037 */ 1038u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1039{ 1040 return (slot->flags & SLOT_ENABLED); 1041} 1042 1043/* 1044 * latch open: 1 1045 * latch closed: 0 1046 */ 1047u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1048{ 1049 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1050} 1051 1052/* 1053 * adapter presence : 1 1054 * absence : 0 1055 */ 1056u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1057{ 1058 return !!get_slot_status(slot); 1059} 1060