1 /* 2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 3 * 4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 6 * Copyright (C) 2002,2003 NEC Corporation 7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) 8 * Copyright (C) 2003-2005 Hewlett Packard 9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 10 * Copyright (C) 2005 Intel Corporation 11 * 12 * All rights reserved. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or (at 17 * your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, but 20 * WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 22 * NON INFRINGEMENT. See the GNU General Public License for more 23 * details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Send feedback to <kristen.c.accardi@intel.com> 30 * 31 */ 32 33 /* 34 * Lifetime rules for pci_dev: 35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 36 * when the bridge is scanned and it loses a refcount when the bridge 37 * is removed. 38 * - When a P2P bridge is present, we elevate the refcount on the subordinate 39 * bus. It loses the refcount when the the driver unloads. 40 */ 41 42 #include <linux/init.h> 43 #include <linux/module.h> 44 45 #include <linux/kernel.h> 46 #include <linux/pci.h> 47 #include <linux/pci_hotplug.h> 48 #include <linux/pci-acpi.h> 49 #include <linux/pm_runtime.h> 50 #include <linux/mutex.h> 51 #include <linux/slab.h> 52 #include <linux/acpi.h> 53 54 #include "../pci.h" 55 #include "acpiphp.h" 56 57 static LIST_HEAD(bridge_list); 58 static DEFINE_MUTEX(bridge_mutex); 59 static DEFINE_MUTEX(acpiphp_context_lock); 60 61 #define MY_NAME "acpiphp_glue" 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 } 212 213 214 static const struct acpi_dock_ops acpiphp_dock_ops = { 215 .fixup = post_dock_fixups, 216 .handler = hotplug_event, 217 }; 218 219 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 220 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 221 { 222 u32 reg32; 223 acpi_handle tmp; 224 struct acpi_pci_root *root; 225 226 /* Check whether the PCIe port supports native PCIe hotplug */ 227 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 228 return false; 229 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 230 return false; 231 232 /* 233 * Check whether native PCIe hotplug has been enabled for 234 * this PCIe hierarchy. 235 */ 236 tmp = acpi_find_root_bridge_handle(pdev); 237 if (!tmp) 238 return false; 239 root = acpi_pci_find_root(tmp); 240 if (!root) 241 return false; 242 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 243 return false; 244 245 return true; 246 } 247 248 static void acpiphp_dock_init(void *data) 249 { 250 struct acpiphp_context *context = data; 251 252 get_bridge(context->func.parent); 253 } 254 255 static void acpiphp_dock_release(void *data) 256 { 257 struct acpiphp_context *context = data; 258 259 put_bridge(context->func.parent); 260 } 261 262 /* callback routine to register each ACPI PCI slot object */ 263 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, 264 void **rv) 265 { 266 struct acpiphp_bridge *bridge = data; 267 struct acpiphp_context *context; 268 struct acpiphp_slot *slot; 269 struct acpiphp_func *newfunc; 270 acpi_status status = AE_OK; 271 unsigned long long adr; 272 int device, function; 273 struct pci_bus *pbus = bridge->pci_bus; 274 struct pci_dev *pdev = bridge->pci_dev; 275 u32 val; 276 277 if (pdev && device_is_managed_by_native_pciehp(pdev)) 278 return AE_OK; 279 280 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 281 if (ACPI_FAILURE(status)) { 282 acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status); 283 return AE_OK; 284 } 285 286 device = (adr >> 16) & 0xffff; 287 function = adr & 0xffff; 288 289 mutex_lock(&acpiphp_context_lock); 290 context = acpiphp_init_context(handle); 291 if (!context) { 292 mutex_unlock(&acpiphp_context_lock); 293 acpi_handle_err(handle, "No hotplug context\n"); 294 return AE_NOT_EXIST; 295 } 296 newfunc = &context->func; 297 newfunc->function = function; 298 newfunc->parent = bridge; 299 mutex_unlock(&acpiphp_context_lock); 300 301 if (acpi_has_method(handle, "_EJ0")) 302 newfunc->flags = FUNC_HAS_EJ0; 303 304 if (acpi_has_method(handle, "_STA")) 305 newfunc->flags |= FUNC_HAS_STA; 306 307 if (acpi_has_method(handle, "_DCK")) 308 newfunc->flags |= FUNC_HAS_DCK; 309 310 /* search for objects that share the same slot */ 311 list_for_each_entry(slot, &bridge->slots, node) 312 if (slot->device == device) 313 goto slot_found; 314 315 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 316 if (!slot) { 317 status = AE_NO_MEMORY; 318 goto err; 319 } 320 321 slot->bus = bridge->pci_bus; 322 slot->device = device; 323 INIT_LIST_HEAD(&slot->funcs); 324 mutex_init(&slot->crit_sect); 325 326 list_add_tail(&slot->node, &bridge->slots); 327 328 /* Register slots for ejectable funtions only. */ 329 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { 330 unsigned long long sun; 331 int retval; 332 333 bridge->nr_slots++; 334 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 335 if (ACPI_FAILURE(status)) 336 sun = bridge->nr_slots; 337 338 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 339 sun, pci_domain_nr(pbus), pbus->number, device); 340 341 retval = acpiphp_register_hotplug_slot(slot, sun); 342 if (retval) { 343 bridge->nr_slots--; 344 if (retval == -EBUSY) 345 warn("Slot %llu already registered by another " 346 "hotplug driver\n", sun); 347 else 348 warn("acpiphp_register_hotplug_slot failed " 349 "(err code = 0x%x)\n", retval); 350 } 351 /* Even if the slot registration fails, we can still use it. */ 352 } 353 354 slot_found: 355 newfunc->slot = slot; 356 list_add_tail(&newfunc->sibling, &slot->funcs); 357 358 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 359 &val, 60*1000)) 360 slot->flags |= SLOT_ENABLED; 361 362 if (is_dock_device(handle)) { 363 /* we don't want to call this device's _EJ0 364 * because we want the dock notify handler 365 * to call it after it calls _DCK 366 */ 367 newfunc->flags &= ~FUNC_HAS_EJ0; 368 if (register_hotplug_dock_device(handle, 369 &acpiphp_dock_ops, context, 370 acpiphp_dock_init, acpiphp_dock_release)) 371 dbg("failed to register dock device\n"); 372 } 373 374 /* install notify handler */ 375 if (!(newfunc->flags & FUNC_HAS_DCK)) { 376 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 377 handle_hotplug_event, 378 context); 379 if (ACPI_FAILURE(status)) 380 acpi_handle_err(handle, 381 "failed to install notify handler\n"); 382 } 383 384 return AE_OK; 385 386 err: 387 mutex_lock(&acpiphp_context_lock); 388 acpiphp_put_context(context); 389 mutex_unlock(&acpiphp_context_lock); 390 return status; 391 } 392 393 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 394 { 395 struct acpiphp_context *context; 396 struct acpiphp_bridge *bridge = NULL; 397 398 mutex_lock(&acpiphp_context_lock); 399 context = acpiphp_get_context(handle); 400 if (context) { 401 bridge = context->bridge; 402 if (bridge) 403 get_bridge(bridge); 404 405 acpiphp_put_context(context); 406 } 407 mutex_unlock(&acpiphp_context_lock); 408 return bridge; 409 } 410 411 static void cleanup_bridge(struct acpiphp_bridge *bridge) 412 { 413 struct acpiphp_slot *slot; 414 struct acpiphp_func *func; 415 acpi_status status; 416 417 list_for_each_entry(slot, &bridge->slots, node) { 418 list_for_each_entry(func, &slot->funcs, sibling) { 419 acpi_handle handle = func_to_handle(func); 420 421 if (is_dock_device(handle)) 422 unregister_hotplug_dock_device(handle); 423 424 if (!(func->flags & FUNC_HAS_DCK)) { 425 status = acpi_remove_notify_handler(handle, 426 ACPI_SYSTEM_NOTIFY, 427 handle_hotplug_event); 428 if (ACPI_FAILURE(status)) 429 err("failed to remove notify handler\n"); 430 } 431 } 432 acpiphp_unregister_hotplug_slot(slot); 433 } 434 435 mutex_lock(&bridge_mutex); 436 list_del(&bridge->list); 437 mutex_unlock(&bridge_mutex); 438 } 439 440 /** 441 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 442 * @bus: bus to start search with 443 */ 444 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 445 { 446 struct list_head *tmp; 447 unsigned char max, n; 448 449 /* 450 * pci_bus_max_busnr will return the highest 451 * reserved busnr for all these children. 452 * that is equivalent to the bus->subordinate 453 * value. We don't want to use the parent's 454 * bus->subordinate value because it could have 455 * padding in it. 456 */ 457 max = bus->busn_res.start; 458 459 list_for_each(tmp, &bus->children) { 460 n = pci_bus_max_busnr(pci_bus_b(tmp)); 461 if (n > max) 462 max = n; 463 } 464 return max; 465 } 466 467 /** 468 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. 469 * @handle: ACPI device object handle to start from. 470 */ 471 static void acpiphp_bus_trim(acpi_handle handle) 472 { 473 struct acpi_device *adev = NULL; 474 475 acpi_bus_get_device(handle, &adev); 476 if (adev) 477 acpi_bus_trim(adev); 478 } 479 480 /** 481 * acpiphp_bus_add - Scan ACPI namespace subtree. 482 * @handle: ACPI object handle to start the scan from. 483 */ 484 static void acpiphp_bus_add(acpi_handle handle) 485 { 486 struct acpi_device *adev = NULL; 487 488 acpiphp_bus_trim(handle); 489 acpi_bus_scan(handle); 490 acpi_bus_get_device(handle, &adev); 491 if (adev) 492 acpi_device_set_power(adev, ACPI_STATE_D0); 493 } 494 495 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 496 { 497 struct acpiphp_func *func; 498 union acpi_object params[2]; 499 struct acpi_object_list arg_list; 500 501 list_for_each_entry(func, &slot->funcs, sibling) { 502 arg_list.count = 2; 503 arg_list.pointer = params; 504 params[0].type = ACPI_TYPE_INTEGER; 505 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 506 params[1].type = ACPI_TYPE_INTEGER; 507 params[1].integer.value = 1; 508 /* _REG is optional, we don't care about if there is failure */ 509 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, 510 NULL); 511 } 512 } 513 514 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 515 { 516 struct acpiphp_func *func; 517 518 /* quirk, or pcie could set it already */ 519 if (dev->is_hotplug_bridge) 520 return; 521 522 list_for_each_entry(func, &slot->funcs, sibling) { 523 if (PCI_FUNC(dev->devfn) == func->function) { 524 dev->is_hotplug_bridge = 1; 525 break; 526 } 527 } 528 } 529 530 /** 531 * enable_slot - enable, configure a slot 532 * @slot: slot to be enabled 533 * 534 * This function should be called per *physical slot*, 535 * not per each slot object in ACPI namespace. 536 */ 537 static void __ref enable_slot(struct acpiphp_slot *slot) 538 { 539 struct pci_dev *dev; 540 struct pci_bus *bus = slot->bus; 541 struct acpiphp_func *func; 542 int max, pass; 543 LIST_HEAD(add_list); 544 545 list_for_each_entry(func, &slot->funcs, sibling) 546 acpiphp_bus_add(func_to_handle(func)); 547 548 pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 549 550 max = acpiphp_max_busnr(bus); 551 for (pass = 0; pass < 2; pass++) { 552 list_for_each_entry(dev, &bus->devices, bus_list) { 553 if (PCI_SLOT(dev->devfn) != slot->device) 554 continue; 555 556 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 557 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 558 max = pci_scan_bridge(bus, dev, max, pass); 559 if (pass && dev->subordinate) { 560 check_hotplug_bridge(slot, dev); 561 pcibios_resource_survey_bus(dev->subordinate); 562 __pci_bus_size_bridges(dev->subordinate, 563 &add_list); 564 } 565 } 566 } 567 } 568 569 __pci_bus_assign_resources(bus, &add_list, NULL); 570 acpiphp_sanitize_bus(bus); 571 acpiphp_set_hpp_values(bus); 572 acpiphp_set_acpi_region(slot); 573 pci_enable_bridges(bus); 574 575 list_for_each_entry(dev, &bus->devices, bus_list) { 576 /* Assume that newly added devices are powered on already. */ 577 if (!dev->is_added) 578 dev->current_state = PCI_D0; 579 } 580 581 pci_bus_add_devices(bus); 582 583 slot->flags |= SLOT_ENABLED; 584 list_for_each_entry(func, &slot->funcs, sibling) { 585 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 586 func->function)); 587 if (!dev) { 588 /* Do not set SLOT_ENABLED flag if some funcs 589 are not added. */ 590 slot->flags &= (~SLOT_ENABLED); 591 continue; 592 } 593 } 594 } 595 596 /* return first device in slot, acquiring a reference on it */ 597 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 598 { 599 struct pci_bus *bus = slot->bus; 600 struct pci_dev *dev; 601 struct pci_dev *ret = NULL; 602 603 down_read(&pci_bus_sem); 604 list_for_each_entry(dev, &bus->devices, bus_list) 605 if (PCI_SLOT(dev->devfn) == slot->device) { 606 ret = pci_dev_get(dev); 607 break; 608 } 609 up_read(&pci_bus_sem); 610 611 return ret; 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 acpiphp_func *func; 621 struct pci_dev *pdev; 622 623 /* 624 * enable_slot() enumerates all functions in this device via 625 * pci_scan_slot(), whether they have associated ACPI hotplug 626 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 627 * here. 628 */ 629 while ((pdev = dev_in_slot(slot))) { 630 pci_stop_and_remove_bus_device(pdev); 631 pci_dev_put(pdev); 632 } 633 634 list_for_each_entry(func, &slot->funcs, sibling) 635 acpiphp_bus_trim(func_to_handle(func)); 636 637 slot->flags &= (~SLOT_ENABLED); 638 } 639 640 641 /** 642 * get_slot_status - get ACPI slot status 643 * @slot: ACPI PHP slot 644 * 645 * If a slot has _STA for each function and if any one of them 646 * returned non-zero status, return it. 647 * 648 * If a slot doesn't have _STA and if any one of its functions' 649 * configuration space is configured, return 0x0f as a _STA. 650 * 651 * Otherwise return 0. 652 */ 653 static unsigned int get_slot_status(struct acpiphp_slot *slot) 654 { 655 unsigned long long sta = 0; 656 struct acpiphp_func *func; 657 658 list_for_each_entry(func, &slot->funcs, sibling) { 659 if (func->flags & FUNC_HAS_STA) { 660 acpi_status status; 661 662 status = acpi_evaluate_integer(func_to_handle(func), 663 "_STA", NULL, &sta); 664 if (ACPI_SUCCESS(status) && sta) 665 break; 666 } else { 667 u32 dvid; 668 669 pci_bus_read_config_dword(slot->bus, 670 PCI_DEVFN(slot->device, 671 func->function), 672 PCI_VENDOR_ID, &dvid); 673 if (dvid != 0xffffffff) { 674 sta = ACPI_STA_ALL; 675 break; 676 } 677 } 678 } 679 680 return (unsigned int)sta; 681 } 682 683 /** 684 * trim_stale_devices - remove PCI devices that are not responding. 685 * @dev: PCI device to start walking the hierarchy from. 686 */ 687 static void trim_stale_devices(struct pci_dev *dev) 688 { 689 acpi_handle handle = ACPI_HANDLE(&dev->dev); 690 struct pci_bus *bus = dev->subordinate; 691 bool alive = false; 692 693 if (handle) { 694 acpi_status status; 695 unsigned long long sta; 696 697 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 698 alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL; 699 } 700 if (!alive) { 701 u32 v; 702 703 /* Check if the device responds. */ 704 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); 705 } 706 if (!alive) { 707 pci_stop_and_remove_bus_device(dev); 708 if (handle) 709 acpiphp_bus_trim(handle); 710 } else if (bus) { 711 struct pci_dev *child, *tmp; 712 713 /* The device is a bridge. so check the bus below it. */ 714 pm_runtime_get_sync(&dev->dev); 715 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) 716 trim_stale_devices(child); 717 718 pm_runtime_put(&dev->dev); 719 } 720 } 721 722 /** 723 * acpiphp_check_bridge - re-enumerate devices 724 * @bridge: where to begin re-enumeration 725 * 726 * Iterate over all slots under this bridge and make sure that if a 727 * card is present they are enabled, and if not they are disabled. 728 */ 729 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 730 { 731 struct acpiphp_slot *slot; 732 733 list_for_each_entry(slot, &bridge->slots, node) { 734 struct pci_bus *bus = slot->bus; 735 struct pci_dev *dev, *tmp; 736 737 mutex_lock(&slot->crit_sect); 738 /* wake up all functions */ 739 if (get_slot_status(slot) == ACPI_STA_ALL) { 740 /* remove stale devices if any */ 741 list_for_each_entry_safe(dev, tmp, &bus->devices, 742 bus_list) 743 if (PCI_SLOT(dev->devfn) == slot->device) 744 trim_stale_devices(dev); 745 746 /* configure all functions */ 747 enable_slot(slot); 748 } else { 749 disable_slot(slot); 750 } 751 mutex_unlock(&slot->crit_sect); 752 } 753 } 754 755 static void acpiphp_set_hpp_values(struct pci_bus *bus) 756 { 757 struct pci_dev *dev; 758 759 list_for_each_entry(dev, &bus->devices, bus_list) 760 pci_configure_slot(dev); 761 } 762 763 /* 764 * Remove devices for which we could not assign resources, call 765 * arch specific code to fix-up the bus 766 */ 767 static void acpiphp_sanitize_bus(struct pci_bus *bus) 768 { 769 struct pci_dev *dev, *tmp; 770 int i; 771 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 772 773 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 774 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 775 struct resource *res = &dev->resource[i]; 776 if ((res->flags & type_mask) && !res->start && 777 res->end) { 778 /* Could not assign a required resources 779 * for this device, remove it */ 780 pci_stop_and_remove_bus_device(dev); 781 break; 782 } 783 } 784 } 785 } 786 787 /* 788 * ACPI event handlers 789 */ 790 791 static acpi_status 792 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 793 { 794 struct acpiphp_bridge *bridge; 795 char objname[64]; 796 struct acpi_buffer buffer = { .length = sizeof(objname), 797 .pointer = objname }; 798 799 bridge = acpiphp_handle_to_bridge(handle); 800 if (bridge) { 801 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 802 dbg("%s: re-enumerating slots under %s\n", 803 __func__, objname); 804 acpiphp_check_bridge(bridge); 805 put_bridge(bridge); 806 } 807 return AE_OK ; 808 } 809 810 void acpiphp_check_host_bridge(acpi_handle handle) 811 { 812 struct acpiphp_bridge *bridge; 813 814 bridge = acpiphp_handle_to_bridge(handle); 815 if (bridge) { 816 acpiphp_check_bridge(bridge); 817 put_bridge(bridge); 818 } 819 820 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 821 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 822 } 823 824 static void hotplug_event(acpi_handle handle, u32 type, void *data) 825 { 826 struct acpiphp_context *context = data; 827 struct acpiphp_func *func = &context->func; 828 struct acpiphp_bridge *bridge; 829 char objname[64]; 830 struct acpi_buffer buffer = { .length = sizeof(objname), 831 .pointer = objname }; 832 833 mutex_lock(&acpiphp_context_lock); 834 bridge = context->bridge; 835 if (bridge) 836 get_bridge(bridge); 837 838 mutex_unlock(&acpiphp_context_lock); 839 840 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 841 842 switch (type) { 843 case ACPI_NOTIFY_BUS_CHECK: 844 /* bus re-enumerate */ 845 dbg("%s: Bus check notify on %s\n", __func__, objname); 846 dbg("%s: re-enumerating slots under %s\n", __func__, objname); 847 if (bridge) { 848 acpiphp_check_bridge(bridge); 849 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 850 ACPI_UINT32_MAX, check_sub_bridges, 851 NULL, NULL, NULL); 852 } else { 853 struct acpiphp_slot *slot = func->slot; 854 855 mutex_lock(&slot->crit_sect); 856 enable_slot(slot); 857 mutex_unlock(&slot->crit_sect); 858 } 859 break; 860 861 case ACPI_NOTIFY_DEVICE_CHECK: 862 /* device check */ 863 dbg("%s: Device check notify on %s\n", __func__, objname); 864 if (bridge) 865 acpiphp_check_bridge(bridge); 866 else 867 acpiphp_check_bridge(func->parent); 868 869 break; 870 871 case ACPI_NOTIFY_EJECT_REQUEST: 872 /* request device eject */ 873 dbg("%s: Device eject notify on %s\n", __func__, objname); 874 acpiphp_disable_and_eject_slot(func->slot); 875 break; 876 } 877 878 if (bridge) 879 put_bridge(bridge); 880 } 881 882 static void hotplug_event_work(struct work_struct *work) 883 { 884 struct acpiphp_context *context; 885 struct acpi_hp_work *hp_work; 886 887 hp_work = container_of(work, struct acpi_hp_work, work); 888 context = hp_work->context; 889 acpi_scan_lock_acquire(); 890 891 hotplug_event(hp_work->handle, hp_work->type, context); 892 893 acpi_scan_lock_release(); 894 kfree(hp_work); /* allocated in handle_hotplug_event() */ 895 put_bridge(context->func.parent); 896 } 897 898 /** 899 * handle_hotplug_event - handle ACPI hotplug event 900 * @handle: Notify()'ed acpi_handle 901 * @type: Notify code 902 * @data: pointer to acpiphp_context structure 903 * 904 * Handles ACPI event notification on slots. 905 */ 906 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 907 { 908 struct acpiphp_context *context; 909 910 switch (type) { 911 case ACPI_NOTIFY_BUS_CHECK: 912 case ACPI_NOTIFY_DEVICE_CHECK: 913 case ACPI_NOTIFY_EJECT_REQUEST: 914 break; 915 916 case ACPI_NOTIFY_DEVICE_WAKE: 917 return; 918 919 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 920 acpi_handle_err(handle, "Device cannot be configured due " 921 "to a frequency mismatch\n"); 922 return; 923 924 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 925 acpi_handle_err(handle, "Device cannot be configured due " 926 "to a bus mode mismatch\n"); 927 return; 928 929 case ACPI_NOTIFY_POWER_FAULT: 930 acpi_handle_err(handle, "Device has suffered a power fault\n"); 931 return; 932 933 default: 934 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); 935 return; 936 } 937 938 mutex_lock(&acpiphp_context_lock); 939 context = acpiphp_get_context(handle); 940 if (context) { 941 get_bridge(context->func.parent); 942 acpiphp_put_context(context); 943 alloc_acpi_hp_work(handle, type, context, hotplug_event_work); 944 } 945 mutex_unlock(&acpiphp_context_lock); 946 } 947 948 /* 949 * Create hotplug slots for the PCI bus. 950 * It should always return 0 to avoid skipping following notifiers. 951 */ 952 void acpiphp_enumerate_slots(struct pci_bus *bus) 953 { 954 struct acpiphp_bridge *bridge; 955 acpi_handle handle; 956 acpi_status status; 957 958 if (acpiphp_disabled) 959 return; 960 961 handle = ACPI_HANDLE(bus->bridge); 962 if (!handle) 963 return; 964 965 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 966 if (!bridge) { 967 acpi_handle_err(handle, "No memory for bridge object\n"); 968 return; 969 } 970 971 INIT_LIST_HEAD(&bridge->slots); 972 kref_init(&bridge->ref); 973 bridge->pci_dev = pci_dev_get(bus->self); 974 bridge->pci_bus = bus; 975 976 /* 977 * Grab a ref to the subordinate PCI bus in case the bus is 978 * removed via PCI core logical hotplug. The ref pins the bus 979 * (which we access during module unload). 980 */ 981 get_device(&bus->dev); 982 983 if (!pci_is_root_bus(bridge->pci_bus)) { 984 struct acpiphp_context *context; 985 986 /* 987 * This bridge should have been registered as a hotplug function 988 * under its parent, so the context has to be there. If not, we 989 * are in deep goo. 990 */ 991 mutex_lock(&acpiphp_context_lock); 992 context = acpiphp_get_context(handle); 993 if (WARN_ON(!context)) { 994 mutex_unlock(&acpiphp_context_lock); 995 put_device(&bus->dev); 996 kfree(bridge); 997 return; 998 } 999 bridge->context = context; 1000 context->bridge = bridge; 1001 /* Get a reference to the parent bridge. */ 1002 get_bridge(context->func.parent); 1003 mutex_unlock(&acpiphp_context_lock); 1004 } 1005 1006 /* must be added to the list prior to calling register_slot */ 1007 mutex_lock(&bridge_mutex); 1008 list_add(&bridge->list, &bridge_list); 1009 mutex_unlock(&bridge_mutex); 1010 1011 /* register all slot objects under this bridge */ 1012 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 1013 register_slot, NULL, bridge, NULL); 1014 if (ACPI_FAILURE(status)) { 1015 acpi_handle_err(handle, "failed to register slots\n"); 1016 cleanup_bridge(bridge); 1017 put_bridge(bridge); 1018 } 1019 } 1020 1021 /* Destroy hotplug slots associated with the PCI bus */ 1022 void acpiphp_remove_slots(struct pci_bus *bus) 1023 { 1024 struct acpiphp_bridge *bridge; 1025 1026 if (acpiphp_disabled) 1027 return; 1028 1029 mutex_lock(&bridge_mutex); 1030 list_for_each_entry(bridge, &bridge_list, list) 1031 if (bridge->pci_bus == bus) { 1032 mutex_unlock(&bridge_mutex); 1033 cleanup_bridge(bridge); 1034 put_bridge(bridge); 1035 return; 1036 } 1037 1038 mutex_unlock(&bridge_mutex); 1039 } 1040 1041 /** 1042 * acpiphp_enable_slot - power on slot 1043 * @slot: ACPI PHP slot 1044 */ 1045 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1046 { 1047 mutex_lock(&slot->crit_sect); 1048 /* configure all functions */ 1049 if (!(slot->flags & SLOT_ENABLED)) 1050 enable_slot(slot); 1051 1052 mutex_unlock(&slot->crit_sect); 1053 return 0; 1054 } 1055 1056 /** 1057 * acpiphp_disable_and_eject_slot - power off and eject slot 1058 * @slot: ACPI PHP slot 1059 */ 1060 int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1061 { 1062 struct acpiphp_func *func; 1063 int retval = 0; 1064 1065 mutex_lock(&slot->crit_sect); 1066 1067 /* unconfigure all functions */ 1068 disable_slot(slot); 1069 1070 list_for_each_entry(func, &slot->funcs, sibling) 1071 if (func->flags & FUNC_HAS_EJ0) { 1072 acpi_handle handle = func_to_handle(func); 1073 1074 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1075 acpi_handle_err(handle, "_EJ0 failed\n"); 1076 1077 break; 1078 } 1079 1080 mutex_unlock(&slot->crit_sect); 1081 return retval; 1082 } 1083 1084 1085 /* 1086 * slot enabled: 1 1087 * slot disabled: 0 1088 */ 1089 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1090 { 1091 return (slot->flags & SLOT_ENABLED); 1092 } 1093 1094 1095 /* 1096 * latch open: 1 1097 * latch closed: 0 1098 */ 1099 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1100 { 1101 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1102 } 1103 1104 1105 /* 1106 * adapter presence : 1 1107 * absence : 0 1108 */ 1109 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1110 { 1111 return !!get_slot_status(slot); 1112 } 1113