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 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 acpi_device *adev = acpi_fetch_acpi_dev(handle); 230 struct acpiphp_bridge *bridge = data; 231 struct acpiphp_context *context; 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 if (!adev) 242 return AE_OK; 243 244 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 245 if (ACPI_FAILURE(status)) { 246 if (status != AE_NOT_FOUND) 247 acpi_handle_warn(handle, 248 "can't evaluate _ADR (%#x)\n", status); 249 return AE_OK; 250 } 251 252 device = (adr >> 16) & 0xffff; 253 function = adr & 0xffff; 254 255 acpi_lock_hp_context(); 256 context = acpiphp_init_context(adev); 257 if (!context) { 258 acpi_unlock_hp_context(); 259 acpi_handle_err(handle, "No hotplug context\n"); 260 return AE_NOT_EXIST; 261 } 262 newfunc = &context->func; 263 newfunc->function = function; 264 newfunc->parent = bridge; 265 acpi_unlock_hp_context(); 266 267 /* 268 * If this is a dock device, its _EJ0 should be executed by the dock 269 * notify handler after calling _DCK. 270 */ 271 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0")) 272 newfunc->flags = FUNC_HAS_EJ0; 273 274 if (acpi_has_method(handle, "_STA")) 275 newfunc->flags |= FUNC_HAS_STA; 276 277 /* search for objects that share the same slot */ 278 list_for_each_entry(slot, &bridge->slots, node) 279 if (slot->device == device) 280 goto slot_found; 281 282 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 283 if (!slot) { 284 acpi_lock_hp_context(); 285 acpiphp_put_context(context); 286 acpi_unlock_hp_context(); 287 return AE_NO_MEMORY; 288 } 289 290 slot->bus = bridge->pci_bus; 291 slot->device = device; 292 INIT_LIST_HEAD(&slot->funcs); 293 294 list_add_tail(&slot->node, &bridge->slots); 295 296 /* 297 * Expose slots to user space for functions that have _EJ0 or _RMV or 298 * are located in dock stations. Do not expose them for devices handled 299 * by the native PCIe hotplug (PCIeHP) or standard PCI hotplug 300 * (SHPCHP), because that code is supposed to expose slots to user 301 * space in those cases. 302 */ 303 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev)) 304 && !(pdev && hotplug_is_native(pdev))) { 305 unsigned long long sun; 306 int retval; 307 308 bridge->nr_slots++; 309 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 310 if (ACPI_FAILURE(status)) 311 sun = bridge->nr_slots; 312 313 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 314 sun, pci_domain_nr(pbus), pbus->number, device); 315 316 retval = acpiphp_register_hotplug_slot(slot, sun); 317 if (retval) { 318 slot->slot = NULL; 319 bridge->nr_slots--; 320 if (retval == -EBUSY) 321 pr_warn("Slot %llu already registered by another hotplug driver\n", sun); 322 else 323 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval); 324 } 325 /* Even if the slot registration fails, we can still use it. */ 326 } 327 328 slot_found: 329 newfunc->slot = slot; 330 list_add_tail(&newfunc->sibling, &slot->funcs); 331 332 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 333 &val, 60*1000)) 334 slot->flags |= SLOT_ENABLED; 335 336 return AE_OK; 337} 338 339static void cleanup_bridge(struct acpiphp_bridge *bridge) 340{ 341 struct acpiphp_slot *slot; 342 struct acpiphp_func *func; 343 344 list_for_each_entry(slot, &bridge->slots, node) { 345 list_for_each_entry(func, &slot->funcs, sibling) { 346 struct acpi_device *adev = func_to_acpi_device(func); 347 348 acpi_lock_hp_context(); 349 adev->hp->notify = NULL; 350 adev->hp->fixup = NULL; 351 acpi_unlock_hp_context(); 352 } 353 slot->flags |= SLOT_IS_GOING_AWAY; 354 if (slot->slot) 355 acpiphp_unregister_hotplug_slot(slot); 356 } 357 358 mutex_lock(&bridge_mutex); 359 list_del(&bridge->list); 360 mutex_unlock(&bridge_mutex); 361 362 acpi_lock_hp_context(); 363 bridge->is_going_away = true; 364 acpi_unlock_hp_context(); 365} 366 367/** 368 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 369 * @bus: bus to start search with 370 */ 371static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 372{ 373 struct pci_bus *tmp; 374 unsigned char max, n; 375 376 /* 377 * pci_bus_max_busnr will return the highest 378 * reserved busnr for all these children. 379 * that is equivalent to the bus->subordinate 380 * value. We don't want to use the parent's 381 * bus->subordinate value because it could have 382 * padding in it. 383 */ 384 max = bus->busn_res.start; 385 386 list_for_each_entry(tmp, &bus->children, node) { 387 n = pci_bus_max_busnr(tmp); 388 if (n > max) 389 max = n; 390 } 391 return max; 392} 393 394static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 395{ 396 struct acpiphp_func *func; 397 398 list_for_each_entry(func, &slot->funcs, sibling) { 399 /* _REG is optional, we don't care about if there is failure */ 400 acpi_evaluate_reg(func_to_handle(func), 401 ACPI_ADR_SPACE_PCI_CONFIG, 402 ACPI_REG_CONNECT); 403 } 404} 405 406static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 407{ 408 struct acpiphp_func *func; 409 410 /* quirk, or pcie could set it already */ 411 if (dev->is_hotplug_bridge) 412 return; 413 414 /* 415 * In the PCIe case, only Root Ports and Downstream Ports are capable of 416 * accommodating hotplug devices, so avoid marking Upstream Ports as 417 * "hotplug bridges". 418 */ 419 if (pci_is_pcie(dev) && pci_pcie_type(dev) == PCI_EXP_TYPE_UPSTREAM) 420 return; 421 422 list_for_each_entry(func, &slot->funcs, sibling) { 423 if (PCI_FUNC(dev->devfn) == func->function) { 424 dev->is_hotplug_bridge = 1; 425 break; 426 } 427 } 428} 429 430static int acpiphp_rescan_slot(struct acpiphp_slot *slot) 431{ 432 struct acpiphp_func *func; 433 434 list_for_each_entry(func, &slot->funcs, sibling) { 435 struct acpi_device *adev = func_to_acpi_device(func); 436 437 acpi_bus_scan(adev->handle); 438 if (acpi_device_enumerated(adev)) 439 acpi_device_set_power(adev, ACPI_STATE_D0); 440 } 441 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); 442} 443 444static void acpiphp_native_scan_bridge(struct pci_dev *bridge) 445{ 446 struct pci_bus *bus = bridge->subordinate; 447 struct pci_dev *dev; 448 int max; 449 450 if (!bus) 451 return; 452 453 max = bus->busn_res.start; 454 /* Scan already configured non-hotplug bridges */ 455 for_each_pci_bridge(dev, bus) { 456 if (!hotplug_is_native(dev)) 457 max = pci_scan_bridge(bus, dev, max, 0); 458 } 459 460 /* Scan non-hotplug bridges that need to be reconfigured */ 461 for_each_pci_bridge(dev, bus) { 462 if (hotplug_is_native(dev)) 463 continue; 464 465 max = pci_scan_bridge(bus, dev, max, 1); 466 if (dev->subordinate) { 467 pcibios_resource_survey_bus(dev->subordinate); 468 pci_bus_size_bridges(dev->subordinate); 469 pci_bus_assign_resources(dev->subordinate); 470 } 471 } 472} 473 474/** 475 * enable_slot - enable, configure a slot 476 * @slot: slot to be enabled 477 * @bridge: true if enable is for the whole bridge (not a single slot) 478 * 479 * This function should be called per *physical slot*, 480 * not per each slot object in ACPI namespace. 481 */ 482static void enable_slot(struct acpiphp_slot *slot, bool bridge) 483{ 484 struct pci_dev *dev; 485 struct pci_bus *bus = slot->bus; 486 struct acpiphp_func *func; 487 488 if (bridge && bus->self && hotplug_is_native(bus->self)) { 489 /* 490 * If native hotplug is used, it will take care of hotplug 491 * slot management and resource allocation for hotplug 492 * bridges. However, ACPI hotplug may still be used for 493 * non-hotplug bridges to bring in additional devices such 494 * as a Thunderbolt host controller. 495 */ 496 for_each_pci_bridge(dev, bus) { 497 if (PCI_SLOT(dev->devfn) == slot->device) 498 acpiphp_native_scan_bridge(dev); 499 } 500 } else { 501 LIST_HEAD(add_list); 502 int max, pass; 503 504 acpiphp_rescan_slot(slot); 505 max = acpiphp_max_busnr(bus); 506 for (pass = 0; pass < 2; pass++) { 507 for_each_pci_bridge(dev, bus) { 508 if (PCI_SLOT(dev->devfn) != slot->device) 509 continue; 510 511 max = pci_scan_bridge(bus, dev, max, pass); 512 if (pass && dev->subordinate) { 513 check_hotplug_bridge(slot, dev); 514 pcibios_resource_survey_bus(dev->subordinate); 515 __pci_bus_size_bridges(dev->subordinate, 516 &add_list); 517 } 518 } 519 } 520 __pci_bus_assign_resources(bus, &add_list, NULL); 521 } 522 523 acpiphp_sanitize_bus(bus); 524 pcie_bus_configure_settings(bus); 525 acpiphp_set_acpi_region(slot); 526 527 list_for_each_entry(dev, &bus->devices, bus_list) { 528 /* Assume that newly added devices are powered on already. */ 529 if (!pci_dev_is_added(dev)) 530 dev->current_state = PCI_D0; 531 } 532 533 pci_bus_add_devices(bus); 534 535 slot->flags |= SLOT_ENABLED; 536 list_for_each_entry(func, &slot->funcs, sibling) { 537 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 538 func->function)); 539 if (!dev) { 540 /* Do not set SLOT_ENABLED flag if some funcs 541 are not added. */ 542 slot->flags &= ~SLOT_ENABLED; 543 continue; 544 } 545 pci_dev_put(dev); 546 } 547} 548 549/** 550 * disable_slot - disable a slot 551 * @slot: ACPI PHP slot 552 */ 553static void disable_slot(struct acpiphp_slot *slot) 554{ 555 struct pci_bus *bus = slot->bus; 556 struct pci_dev *dev, *prev; 557 struct acpiphp_func *func; 558 559 /* 560 * enable_slot() enumerates all functions in this device via 561 * pci_scan_slot(), whether they have associated ACPI hotplug 562 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 563 * here. 564 */ 565 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) 566 if (PCI_SLOT(dev->devfn) == slot->device) 567 pci_stop_and_remove_bus_device(dev); 568 569 list_for_each_entry(func, &slot->funcs, sibling) 570 acpi_bus_trim(func_to_acpi_device(func)); 571 572 slot->flags &= ~SLOT_ENABLED; 573} 574 575static bool slot_no_hotplug(struct acpiphp_slot *slot) 576{ 577 struct pci_bus *bus = slot->bus; 578 struct pci_dev *dev; 579 580 list_for_each_entry(dev, &bus->devices, bus_list) { 581 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug) 582 return true; 583 } 584 return false; 585} 586 587/** 588 * get_slot_status - get ACPI slot status 589 * @slot: ACPI PHP slot 590 * 591 * If a slot has _STA for each function and if any one of them 592 * returned non-zero status, return it. 593 * 594 * If a slot doesn't have _STA and if any one of its functions' 595 * configuration space is configured, return 0x0f as a _STA. 596 * 597 * Otherwise return 0. 598 */ 599static unsigned int get_slot_status(struct acpiphp_slot *slot) 600{ 601 unsigned long long sta = 0; 602 struct acpiphp_func *func; 603 u32 dvid; 604 605 list_for_each_entry(func, &slot->funcs, sibling) { 606 if (func->flags & FUNC_HAS_STA) { 607 acpi_status status; 608 609 status = acpi_evaluate_integer(func_to_handle(func), 610 "_STA", NULL, &sta); 611 if (ACPI_SUCCESS(status) && sta) 612 break; 613 } else { 614 if (pci_bus_read_dev_vendor_id(slot->bus, 615 PCI_DEVFN(slot->device, func->function), 616 &dvid, 0)) { 617 sta = ACPI_STA_ALL; 618 break; 619 } 620 } 621 } 622 623 if (!sta) { 624 /* 625 * Check for the slot itself since it may be that the 626 * ACPI slot is a device below PCIe upstream port so in 627 * that case it may not even be reachable yet. 628 */ 629 if (pci_bus_read_dev_vendor_id(slot->bus, 630 PCI_DEVFN(slot->device, 0), &dvid, 0)) { 631 sta = ACPI_STA_ALL; 632 } 633 } 634 635 return (unsigned int)sta; 636} 637 638static inline bool device_status_valid(unsigned int sta) 639{ 640 /* 641 * ACPI spec says that _STA may return bit 0 clear with bit 3 set 642 * if the device is valid but does not require a device driver to be 643 * loaded (Section 6.3.7 of ACPI 5.0A). 644 */ 645 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING; 646 return (sta & mask) == mask; 647} 648 649/** 650 * trim_stale_devices - remove PCI devices that are not responding. 651 * @dev: PCI device to start walking the hierarchy from. 652 */ 653static void trim_stale_devices(struct pci_dev *dev) 654{ 655 struct acpi_device *adev = ACPI_COMPANION(&dev->dev); 656 struct pci_bus *bus = dev->subordinate; 657 bool alive = dev->ignore_hotplug; 658 659 if (adev) { 660 acpi_status status; 661 unsigned long long sta; 662 663 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); 664 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta)); 665 } 666 if (!alive) 667 alive = pci_device_is_present(dev); 668 669 if (!alive) { 670 pci_dev_set_disconnected(dev, NULL); 671 if (pci_has_subordinate(dev)) 672 pci_walk_bus(dev->subordinate, pci_dev_set_disconnected, 673 NULL); 674 675 pci_stop_and_remove_bus_device(dev); 676 if (adev) 677 acpi_bus_trim(adev); 678 } else if (bus) { 679 struct pci_dev *child, *tmp; 680 681 /* The device is a bridge. so check the bus below it. */ 682 pm_runtime_get_sync(&dev->dev); 683 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) 684 trim_stale_devices(child); 685 686 pm_runtime_put(&dev->dev); 687 } 688} 689 690/** 691 * acpiphp_check_bridge - re-enumerate devices 692 * @bridge: where to begin re-enumeration 693 * 694 * Iterate over all slots under this bridge and make sure that if a 695 * card is present they are enabled, and if not they are disabled. 696 */ 697static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 698{ 699 struct acpiphp_slot *slot; 700 701 /* Bail out if the bridge is going away. */ 702 if (bridge->is_going_away) 703 return; 704 705 if (bridge->pci_dev) 706 pm_runtime_get_sync(&bridge->pci_dev->dev); 707 708 list_for_each_entry(slot, &bridge->slots, node) { 709 struct pci_bus *bus = slot->bus; 710 struct pci_dev *dev, *tmp; 711 712 if (slot_no_hotplug(slot)) { 713 ; /* do nothing */ 714 } else if (device_status_valid(get_slot_status(slot))) { 715 /* remove stale devices if any */ 716 list_for_each_entry_safe_reverse(dev, tmp, 717 &bus->devices, bus_list) 718 if (PCI_SLOT(dev->devfn) == slot->device) 719 trim_stale_devices(dev); 720 721 /* configure all functions */ 722 enable_slot(slot, true); 723 } else { 724 disable_slot(slot); 725 } 726 } 727 728 if (bridge->pci_dev) 729 pm_runtime_put(&bridge->pci_dev->dev); 730} 731 732/* 733 * Remove devices for which we could not assign resources, call 734 * arch specific code to fix-up the bus 735 */ 736static void acpiphp_sanitize_bus(struct pci_bus *bus) 737{ 738 struct pci_dev *dev, *tmp; 739 int i; 740 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 741 742 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { 743 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) { 744 struct resource *res = &dev->resource[i]; 745 if ((res->flags & type_mask) && !res->start && 746 res->end) { 747 /* Could not assign a required resources 748 * for this device, remove it */ 749 pci_stop_and_remove_bus_device(dev); 750 break; 751 } 752 } 753 } 754} 755 756/* 757 * ACPI event handlers 758 */ 759 760void acpiphp_check_host_bridge(struct acpi_device *adev) 761{ 762 struct acpiphp_bridge *bridge = NULL; 763 764 acpi_lock_hp_context(); 765 if (adev->hp) { 766 bridge = to_acpiphp_root_context(adev->hp)->root_bridge; 767 if (bridge) 768 get_bridge(bridge); 769 } 770 acpi_unlock_hp_context(); 771 if (bridge) { 772 pci_lock_rescan_remove(); 773 774 acpiphp_check_bridge(bridge); 775 776 pci_unlock_rescan_remove(); 777 put_bridge(bridge); 778 } 779} 780 781static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); 782 783static void hotplug_event(u32 type, struct acpiphp_context *context) 784{ 785 acpi_handle handle = context->hp.self->handle; 786 struct acpiphp_func *func = &context->func; 787 struct acpiphp_slot *slot = func->slot; 788 struct acpiphp_bridge *bridge; 789 790 acpi_lock_hp_context(); 791 bridge = context->bridge; 792 if (bridge) 793 get_bridge(bridge); 794 795 acpi_unlock_hp_context(); 796 797 pci_lock_rescan_remove(); 798 799 switch (type) { 800 case ACPI_NOTIFY_BUS_CHECK: 801 /* bus re-enumerate */ 802 acpi_handle_debug(handle, "Bus check in %s()\n", __func__); 803 if (bridge) 804 acpiphp_check_bridge(bridge); 805 else if (!(slot->flags & SLOT_IS_GOING_AWAY)) 806 enable_slot(slot, false); 807 808 break; 809 810 case ACPI_NOTIFY_DEVICE_CHECK: 811 /* device check */ 812 acpi_handle_debug(handle, "Device check in %s()\n", __func__); 813 if (bridge) { 814 acpiphp_check_bridge(bridge); 815 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) { 816 /* 817 * Check if anything has changed in the slot and rescan 818 * from the parent if that's the case. 819 */ 820 if (acpiphp_rescan_slot(slot)) 821 acpiphp_check_bridge(func->parent); 822 } 823 break; 824 825 case ACPI_NOTIFY_EJECT_REQUEST: 826 /* request device eject */ 827 acpi_handle_debug(handle, "Eject request in %s()\n", __func__); 828 acpiphp_disable_and_eject_slot(slot); 829 break; 830 } 831 832 pci_unlock_rescan_remove(); 833 if (bridge) 834 put_bridge(bridge); 835} 836 837static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) 838{ 839 struct acpiphp_context *context; 840 841 context = acpiphp_grab_context(adev); 842 if (!context) 843 return -ENODATA; 844 845 hotplug_event(type, context); 846 acpiphp_let_context_go(context); 847 return 0; 848} 849 850/** 851 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. 852 * @bus: PCI bus to enumerate the slots for. 853 * 854 * A "slot" is an object associated with a PCI device number. All functions 855 * (PCI devices) with the same bus and device number belong to the same slot. 856 */ 857void acpiphp_enumerate_slots(struct pci_bus *bus) 858{ 859 struct acpiphp_bridge *bridge; 860 struct acpi_device *adev; 861 acpi_handle handle; 862 acpi_status status; 863 864 if (acpiphp_disabled) 865 return; 866 867 adev = ACPI_COMPANION(bus->bridge); 868 if (!adev) 869 return; 870 871 handle = adev->handle; 872 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 873 if (!bridge) 874 return; 875 876 INIT_LIST_HEAD(&bridge->slots); 877 kref_init(&bridge->ref); 878 bridge->pci_dev = pci_dev_get(bus->self); 879 bridge->pci_bus = bus; 880 881 /* 882 * Grab a ref to the subordinate PCI bus in case the bus is 883 * removed via PCI core logical hotplug. The ref pins the bus 884 * (which we access during module unload). 885 */ 886 get_device(&bus->dev); 887 888 acpi_lock_hp_context(); 889 if (pci_is_root_bus(bridge->pci_bus)) { 890 struct acpiphp_root_context *root_context; 891 892 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL); 893 if (!root_context) 894 goto err; 895 896 root_context->root_bridge = bridge; 897 acpi_set_hp_context(adev, &root_context->hp); 898 } else { 899 struct acpiphp_context *context; 900 901 /* 902 * This bridge should have been registered as a hotplug function 903 * under its parent, so the context should be there, unless the 904 * parent is going to be handled by pciehp, in which case this 905 * bridge is not interesting to us either. 906 */ 907 context = acpiphp_get_context(adev); 908 if (!context) 909 goto err; 910 911 bridge->context = context; 912 context->bridge = bridge; 913 /* Get a reference to the parent bridge. */ 914 get_bridge(context->func.parent); 915 } 916 acpi_unlock_hp_context(); 917 918 /* Must be added to the list prior to calling acpiphp_add_context(). */ 919 mutex_lock(&bridge_mutex); 920 list_add(&bridge->list, &bridge_list); 921 mutex_unlock(&bridge_mutex); 922 923 /* register all slot objects under this bridge */ 924 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 925 acpiphp_add_context, NULL, bridge, NULL); 926 if (ACPI_FAILURE(status)) { 927 acpi_handle_err(handle, "failed to register slots\n"); 928 cleanup_bridge(bridge); 929 put_bridge(bridge); 930 } 931 return; 932 933 err: 934 acpi_unlock_hp_context(); 935 put_device(&bus->dev); 936 pci_dev_put(bridge->pci_dev); 937 kfree(bridge); 938} 939 940static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge) 941{ 942 if (pci_is_root_bus(bridge->pci_bus)) { 943 struct acpiphp_root_context *root_context; 944 struct acpi_device *adev; 945 946 acpi_lock_hp_context(); 947 adev = ACPI_COMPANION(bridge->pci_bus->bridge); 948 root_context = to_acpiphp_root_context(adev->hp); 949 adev->hp = NULL; 950 acpi_unlock_hp_context(); 951 kfree(root_context); 952 } 953 cleanup_bridge(bridge); 954 put_bridge(bridge); 955} 956 957/** 958 * acpiphp_remove_slots - Remove slot objects associated with a given bus. 959 * @bus: PCI bus to remove the slot objects for. 960 */ 961void acpiphp_remove_slots(struct pci_bus *bus) 962{ 963 struct acpiphp_bridge *bridge; 964 965 if (acpiphp_disabled) 966 return; 967 968 mutex_lock(&bridge_mutex); 969 list_for_each_entry(bridge, &bridge_list, list) 970 if (bridge->pci_bus == bus) { 971 mutex_unlock(&bridge_mutex); 972 acpiphp_drop_bridge(bridge); 973 return; 974 } 975 976 mutex_unlock(&bridge_mutex); 977} 978 979/** 980 * acpiphp_enable_slot - power on slot 981 * @slot: ACPI PHP slot 982 */ 983int acpiphp_enable_slot(struct acpiphp_slot *slot) 984{ 985 pci_lock_rescan_remove(); 986 987 if (slot->flags & SLOT_IS_GOING_AWAY) { 988 pci_unlock_rescan_remove(); 989 return -ENODEV; 990 } 991 992 /* configure all functions */ 993 if (!(slot->flags & SLOT_ENABLED)) 994 enable_slot(slot, false); 995 996 pci_unlock_rescan_remove(); 997 return 0; 998} 999 1000/** 1001 * acpiphp_disable_and_eject_slot - power off and eject slot 1002 * @slot: ACPI PHP slot 1003 */ 1004static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1005{ 1006 struct acpiphp_func *func; 1007 1008 if (slot->flags & SLOT_IS_GOING_AWAY) 1009 return -ENODEV; 1010 1011 /* unconfigure all functions */ 1012 disable_slot(slot); 1013 1014 list_for_each_entry(func, &slot->funcs, sibling) 1015 if (func->flags & FUNC_HAS_EJ0) { 1016 acpi_handle handle = func_to_handle(func); 1017 1018 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1019 acpi_handle_err(handle, "_EJ0 failed\n"); 1020 1021 break; 1022 } 1023 1024 return 0; 1025} 1026 1027int acpiphp_disable_slot(struct acpiphp_slot *slot) 1028{ 1029 int ret; 1030 1031 /* 1032 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in 1033 * acpiphp_disable_and_eject_slot() will be synchronized properly. 1034 */ 1035 acpi_scan_lock_acquire(); 1036 pci_lock_rescan_remove(); 1037 ret = acpiphp_disable_and_eject_slot(slot); 1038 pci_unlock_rescan_remove(); 1039 acpi_scan_lock_release(); 1040 return ret; 1041} 1042 1043/* 1044 * slot enabled: 1 1045 * slot disabled: 0 1046 */ 1047u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1048{ 1049 return (slot->flags & SLOT_ENABLED); 1050} 1051 1052/* 1053 * latch open: 1 1054 * latch closed: 0 1055 */ 1056u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1057{ 1058 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1059} 1060 1061/* 1062 * adapter presence : 1 1063 * absence : 0 1064 */ 1065u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1066{ 1067 return !!get_slot_status(slot); 1068} 1069