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