1 /* 2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 3 * 4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 6 * Copyright (C) 2002,2003 NEC Corporation 7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) 8 * Copyright (C) 2003-2005 Hewlett Packard 9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 10 * Copyright (C) 2005 Intel Corporation 11 * 12 * All rights reserved. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or (at 17 * your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, but 20 * WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 22 * NON INFRINGEMENT. See the GNU General Public License for more 23 * details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Send feedback to <kristen.c.accardi@intel.com> 30 * 31 */ 32 33 /* 34 * Lifetime rules for pci_dev: 35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 36 * when the bridge is scanned and it loses a refcount when the bridge 37 * is removed. 38 * - When a P2P bridge is present, we elevate the refcount on the subordinate 39 * bus. It loses the refcount when the the driver unloads. 40 */ 41 42 #define pr_fmt(fmt) "acpiphp_glue: " fmt 43 44 #include <linux/init.h> 45 #include <linux/module.h> 46 47 #include <linux/kernel.h> 48 #include <linux/pci.h> 49 #include <linux/pci_hotplug.h> 50 #include <linux/pci-acpi.h> 51 #include <linux/pm_runtime.h> 52 #include <linux/mutex.h> 53 #include <linux/slab.h> 54 #include <linux/acpi.h> 55 56 #include "../pci.h" 57 #include "acpiphp.h" 58 59 static LIST_HEAD(bridge_list); 60 static DEFINE_MUTEX(bridge_mutex); 61 static DEFINE_MUTEX(acpiphp_context_lock); 62 63 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); 64 static void acpiphp_sanitize_bus(struct pci_bus *bus); 65 static void acpiphp_set_hpp_values(struct pci_bus *bus); 66 static void hotplug_event(acpi_handle handle, u32 type, void *data); 67 static void free_bridge(struct kref *kref); 68 69 static void acpiphp_context_handler(acpi_handle handle, void *context) 70 { 71 /* Intentionally empty. */ 72 } 73 74 /** 75 * acpiphp_init_context - Create hotplug context and grab a reference to it. 76 * @handle: ACPI object handle to create the context for. 77 * 78 * Call under acpiphp_context_lock. 79 */ 80 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle) 81 { 82 struct acpiphp_context *context; 83 acpi_status status; 84 85 context = kzalloc(sizeof(*context), GFP_KERNEL); 86 if (!context) 87 return NULL; 88 89 context->handle = handle; 90 context->refcount = 1; 91 status = acpi_attach_data(handle, acpiphp_context_handler, context); 92 if (ACPI_FAILURE(status)) { 93 kfree(context); 94 return NULL; 95 } 96 return context; 97 } 98 99 /** 100 * acpiphp_get_context - Get hotplug context and grab a reference to it. 101 * @handle: ACPI object handle to get the context for. 102 * 103 * Call under acpiphp_context_lock. 104 */ 105 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle) 106 { 107 struct acpiphp_context *context = NULL; 108 acpi_status status; 109 void *data; 110 111 status = acpi_get_data(handle, acpiphp_context_handler, &data); 112 if (ACPI_SUCCESS(status)) { 113 context = data; 114 context->refcount++; 115 } 116 return context; 117 } 118 119 /** 120 * acpiphp_put_context - Drop a reference to ACPI hotplug context. 121 * @handle: ACPI object handle to put the context for. 122 * 123 * The context object is removed if there are no more references to it. 124 * 125 * Call under acpiphp_context_lock. 126 */ 127 static void acpiphp_put_context(struct acpiphp_context *context) 128 { 129 if (--context->refcount) 130 return; 131 132 WARN_ON(context->bridge); 133 acpi_detach_data(context->handle, acpiphp_context_handler); 134 kfree(context); 135 } 136 137 static inline void get_bridge(struct acpiphp_bridge *bridge) 138 { 139 kref_get(&bridge->ref); 140 } 141 142 static inline void put_bridge(struct acpiphp_bridge *bridge) 143 { 144 kref_put(&bridge->ref, free_bridge); 145 } 146 147 static void free_bridge(struct kref *kref) 148 { 149 struct acpiphp_context *context; 150 struct acpiphp_bridge *bridge; 151 struct acpiphp_slot *slot, *next; 152 struct acpiphp_func *func, *tmp; 153 154 mutex_lock(&acpiphp_context_lock); 155 156 bridge = container_of(kref, struct acpiphp_bridge, ref); 157 158 list_for_each_entry_safe(slot, next, &bridge->slots, node) { 159 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) 160 acpiphp_put_context(func_to_context(func)); 161 162 kfree(slot); 163 } 164 165 context = bridge->context; 166 /* Root bridges will not have hotplug context. */ 167 if (context) { 168 /* Release the reference taken by acpiphp_enumerate_slots(). */ 169 put_bridge(context->func.parent); 170 context->bridge = NULL; 171 acpiphp_put_context(context); 172 } 173 174 put_device(&bridge->pci_bus->dev); 175 pci_dev_put(bridge->pci_dev); 176 kfree(bridge); 177 178 mutex_unlock(&acpiphp_context_lock); 179 } 180 181 /* 182 * the _DCK method can do funny things... and sometimes not 183 * hah-hah funny. 184 * 185 * TBD - figure out a way to only call fixups for 186 * systems that require them. 187 */ 188 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) 189 { 190 struct acpiphp_context *context = data; 191 struct pci_bus *bus = context->func.slot->bus; 192 u32 buses; 193 194 if (!bus->self) 195 return; 196 197 /* fixup bad _DCK function that rewrites 198 * secondary bridge on slot 199 */ 200 pci_read_config_dword(bus->self, 201 PCI_PRIMARY_BUS, 202 &buses); 203 204 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 205 buses = (buses & 0xff000000) 206 | ((unsigned int)(bus->primary) << 0) 207 | ((unsigned int)(bus->busn_res.start) << 8) 208 | ((unsigned int)(bus->busn_res.end) << 16); 209 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 210 } 211 } 212 213 static void dock_event(acpi_handle handle, u32 type, void *data) 214 { 215 struct acpiphp_context *context; 216 217 mutex_lock(&acpiphp_context_lock); 218 context = acpiphp_get_context(handle); 219 if (!context || WARN_ON(context->handle != handle) 220 || context->func.parent->is_going_away) { 221 mutex_unlock(&acpiphp_context_lock); 222 return; 223 } 224 get_bridge(context->func.parent); 225 acpiphp_put_context(context); 226 mutex_unlock(&acpiphp_context_lock); 227 228 hotplug_event(handle, type, data); 229 230 put_bridge(context->func.parent); 231 } 232 233 static const struct acpi_dock_ops acpiphp_dock_ops = { 234 .fixup = post_dock_fixups, 235 .handler = dock_event, 236 }; 237 238 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 239 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 240 { 241 u32 reg32; 242 acpi_handle tmp; 243 struct acpi_pci_root *root; 244 245 /* Check whether the PCIe port supports native PCIe hotplug */ 246 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 247 return false; 248 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 249 return false; 250 251 /* 252 * Check whether native PCIe hotplug has been enabled for 253 * this PCIe hierarchy. 254 */ 255 tmp = acpi_find_root_bridge_handle(pdev); 256 if (!tmp) 257 return false; 258 root = acpi_pci_find_root(tmp); 259 if (!root) 260 return false; 261 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 262 return false; 263 264 return true; 265 } 266 267 static void acpiphp_dock_init(void *data) 268 { 269 struct acpiphp_context *context = data; 270 271 get_bridge(context->func.parent); 272 } 273 274 static void acpiphp_dock_release(void *data) 275 { 276 struct acpiphp_context *context = data; 277 278 put_bridge(context->func.parent); 279 } 280 281 /* callback routine to register each ACPI PCI slot object */ 282 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, 283 void **rv) 284 { 285 struct acpiphp_bridge *bridge = data; 286 struct acpiphp_context *context; 287 struct acpiphp_slot *slot; 288 struct acpiphp_func *newfunc; 289 acpi_status status = AE_OK; 290 unsigned long long adr; 291 int device, function; 292 struct pci_bus *pbus = bridge->pci_bus; 293 struct pci_dev *pdev = bridge->pci_dev; 294 u32 val; 295 296 if (pdev && device_is_managed_by_native_pciehp(pdev)) 297 return AE_OK; 298 299 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 300 if (ACPI_FAILURE(status)) { 301 if (status != AE_NOT_FOUND) 302 acpi_handle_warn(handle, 303 "can't evaluate _ADR (%#x)\n", status); 304 return AE_OK; 305 } 306 307 device = (adr >> 16) & 0xffff; 308 function = adr & 0xffff; 309 310 mutex_lock(&acpiphp_context_lock); 311 context = acpiphp_init_context(handle); 312 if (!context) { 313 mutex_unlock(&acpiphp_context_lock); 314 acpi_handle_err(handle, "No hotplug context\n"); 315 return AE_NOT_EXIST; 316 } 317 newfunc = &context->func; 318 newfunc->function = function; 319 newfunc->parent = bridge; 320 mutex_unlock(&acpiphp_context_lock); 321 322 if (acpi_has_method(handle, "_EJ0")) 323 newfunc->flags = FUNC_HAS_EJ0; 324 325 if (acpi_has_method(handle, "_STA")) 326 newfunc->flags |= FUNC_HAS_STA; 327 328 if (acpi_has_method(handle, "_DCK")) 329 newfunc->flags |= FUNC_HAS_DCK; 330 331 /* search for objects that share the same slot */ 332 list_for_each_entry(slot, &bridge->slots, node) 333 if (slot->device == device) 334 goto slot_found; 335 336 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 337 if (!slot) { 338 status = AE_NO_MEMORY; 339 goto err; 340 } 341 342 slot->bus = bridge->pci_bus; 343 slot->device = device; 344 INIT_LIST_HEAD(&slot->funcs); 345 mutex_init(&slot->crit_sect); 346 347 list_add_tail(&slot->node, &bridge->slots); 348 349 /* Register slots for ejectable functions only. */ 350 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { 351 unsigned long long sun; 352 int retval; 353 354 bridge->nr_slots++; 355 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 356 if (ACPI_FAILURE(status)) 357 sun = bridge->nr_slots; 358 359 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 360 sun, pci_domain_nr(pbus), pbus->number, device); 361 362 retval = acpiphp_register_hotplug_slot(slot, sun); 363 if (retval) { 364 slot->slot = NULL; 365 bridge->nr_slots--; 366 if (retval == -EBUSY) 367 pr_warn("Slot %llu already registered by another " 368 "hotplug driver\n", sun); 369 else 370 pr_warn("acpiphp_register_hotplug_slot failed " 371 "(err code = 0x%x)\n", retval); 372 } 373 /* Even if the slot registration fails, we can still use it. */ 374 } 375 376 slot_found: 377 newfunc->slot = slot; 378 list_add_tail(&newfunc->sibling, &slot->funcs); 379 380 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 381 &val, 60*1000)) 382 slot->flags |= SLOT_ENABLED; 383 384 if (is_dock_device(handle)) { 385 /* we don't want to call this device's _EJ0 386 * because we want the dock notify handler 387 * to call it after it calls _DCK 388 */ 389 newfunc->flags &= ~FUNC_HAS_EJ0; 390 if (register_hotplug_dock_device(handle, 391 &acpiphp_dock_ops, context, 392 acpiphp_dock_init, acpiphp_dock_release)) 393 pr_debug("failed to register dock device\n"); 394 } 395 396 /* install notify handler */ 397 if (!(newfunc->flags & FUNC_HAS_DCK)) { 398 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 399 handle_hotplug_event, 400 context); 401 if (ACPI_FAILURE(status)) 402 acpi_handle_err(handle, 403 "failed to install notify handler\n"); 404 } 405 406 return AE_OK; 407 408 err: 409 mutex_lock(&acpiphp_context_lock); 410 acpiphp_put_context(context); 411 mutex_unlock(&acpiphp_context_lock); 412 return status; 413 } 414 415 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 416 { 417 struct acpiphp_context *context; 418 struct acpiphp_bridge *bridge = NULL; 419 420 mutex_lock(&acpiphp_context_lock); 421 context = acpiphp_get_context(handle); 422 if (context) { 423 bridge = context->bridge; 424 if (bridge) 425 get_bridge(bridge); 426 427 acpiphp_put_context(context); 428 } 429 mutex_unlock(&acpiphp_context_lock); 430 return bridge; 431 } 432 433 static void cleanup_bridge(struct acpiphp_bridge *bridge) 434 { 435 struct acpiphp_slot *slot; 436 struct acpiphp_func *func; 437 acpi_status status; 438 439 list_for_each_entry(slot, &bridge->slots, node) { 440 list_for_each_entry(func, &slot->funcs, sibling) { 441 acpi_handle handle = func_to_handle(func); 442 443 if (is_dock_device(handle)) 444 unregister_hotplug_dock_device(handle); 445 446 if (!(func->flags & FUNC_HAS_DCK)) { 447 status = acpi_remove_notify_handler(handle, 448 ACPI_SYSTEM_NOTIFY, 449 handle_hotplug_event); 450 if (ACPI_FAILURE(status)) 451 pr_err("failed to remove notify handler\n"); 452 } 453 } 454 slot->flags |= SLOT_IS_GOING_AWAY; 455 if (slot->slot) 456 acpiphp_unregister_hotplug_slot(slot); 457 } 458 459 mutex_lock(&bridge_mutex); 460 list_del(&bridge->list); 461 mutex_unlock(&bridge_mutex); 462 463 mutex_lock(&acpiphp_context_lock); 464 bridge->is_going_away = true; 465 mutex_unlock(&acpiphp_context_lock); 466 } 467 468 /** 469 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 470 * @bus: bus to start search with 471 */ 472 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 473 { 474 struct list_head *tmp; 475 unsigned char max, n; 476 477 /* 478 * pci_bus_max_busnr will return the highest 479 * reserved busnr for all these children. 480 * that is equivalent to the bus->subordinate 481 * value. We don't want to use the parent's 482 * bus->subordinate value because it could have 483 * padding in it. 484 */ 485 max = bus->busn_res.start; 486 487 list_for_each(tmp, &bus->children) { 488 n = pci_bus_max_busnr(pci_bus_b(tmp)); 489 if (n > max) 490 max = n; 491 } 492 return max; 493 } 494 495 /** 496 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. 497 * @handle: ACPI device object handle to start from. 498 */ 499 static void acpiphp_bus_trim(acpi_handle handle) 500 { 501 struct acpi_device *adev = NULL; 502 503 acpi_bus_get_device(handle, &adev); 504 if (adev) 505 acpi_bus_trim(adev); 506 } 507 508 /** 509 * acpiphp_bus_add - Scan ACPI namespace subtree. 510 * @handle: ACPI object handle to start the scan from. 511 */ 512 static void acpiphp_bus_add(acpi_handle handle) 513 { 514 struct acpi_device *adev = NULL; 515 516 acpi_bus_scan(handle); 517 acpi_bus_get_device(handle, &adev); 518 if (acpi_device_enumerated(adev)) 519 acpi_device_set_power(adev, ACPI_STATE_D0); 520 } 521 522 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 523 { 524 struct acpiphp_func *func; 525 union acpi_object params[2]; 526 struct acpi_object_list arg_list; 527 528 list_for_each_entry(func, &slot->funcs, sibling) { 529 arg_list.count = 2; 530 arg_list.pointer = params; 531 params[0].type = ACPI_TYPE_INTEGER; 532 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 533 params[1].type = ACPI_TYPE_INTEGER; 534 params[1].integer.value = 1; 535 /* _REG is optional, we don't care about if there is failure */ 536 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, 537 NULL); 538 } 539 } 540 541 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 542 { 543 struct acpiphp_func *func; 544 545 /* quirk, or pcie could set it already */ 546 if (dev->is_hotplug_bridge) 547 return; 548 549 list_for_each_entry(func, &slot->funcs, sibling) { 550 if (PCI_FUNC(dev->devfn) == func->function) { 551 dev->is_hotplug_bridge = 1; 552 break; 553 } 554 } 555 } 556 557 static int acpiphp_rescan_slot(struct acpiphp_slot *slot) 558 { 559 struct acpiphp_func *func; 560 561 list_for_each_entry(func, &slot->funcs, sibling) 562 acpiphp_bus_add(func_to_handle(func)); 563 564 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); 565 } 566 567 /** 568 * enable_slot - enable, configure a slot 569 * @slot: slot to be enabled 570 * 571 * This function should be called per *physical slot*, 572 * not per each slot object in ACPI namespace. 573 */ 574 static void __ref enable_slot(struct acpiphp_slot *slot) 575 { 576 struct pci_dev *dev; 577 struct pci_bus *bus = slot->bus; 578 struct acpiphp_func *func; 579 int max, pass; 580 LIST_HEAD(add_list); 581 582 acpiphp_rescan_slot(slot); 583 max = acpiphp_max_busnr(bus); 584 for (pass = 0; pass < 2; pass++) { 585 list_for_each_entry(dev, &bus->devices, bus_list) { 586 if (PCI_SLOT(dev->devfn) != slot->device) 587 continue; 588 589 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 590 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 591 max = pci_scan_bridge(bus, dev, max, pass); 592 if (pass && dev->subordinate) { 593 check_hotplug_bridge(slot, dev); 594 pcibios_resource_survey_bus(dev->subordinate); 595 __pci_bus_size_bridges(dev->subordinate, 596 &add_list); 597 } 598 } 599 } 600 } 601 __pci_bus_assign_resources(bus, &add_list, NULL); 602 603 acpiphp_sanitize_bus(bus); 604 acpiphp_set_hpp_values(bus); 605 acpiphp_set_acpi_region(slot); 606 607 list_for_each_entry(dev, &bus->devices, bus_list) { 608 /* Assume that newly added devices are powered on already. */ 609 if (!dev->is_added) 610 dev->current_state = PCI_D0; 611 } 612 613 pci_bus_add_devices(bus); 614 615 slot->flags |= SLOT_ENABLED; 616 list_for_each_entry(func, &slot->funcs, sibling) { 617 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 618 func->function)); 619 if (!dev) { 620 /* Do not set SLOT_ENABLED flag if some funcs 621 are not added. */ 622 slot->flags &= (~SLOT_ENABLED); 623 continue; 624 } 625 } 626 } 627 628 /** 629 * disable_slot - disable a slot 630 * @slot: ACPI PHP slot 631 */ 632 static void disable_slot(struct acpiphp_slot *slot) 633 { 634 struct pci_bus *bus = slot->bus; 635 struct pci_dev *dev, *prev; 636 struct acpiphp_func *func; 637 638 /* 639 * enable_slot() enumerates all functions in this device via 640 * pci_scan_slot(), whether they have associated ACPI hotplug 641 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 642 * here. 643 */ 644 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) 645 if (PCI_SLOT(dev->devfn) == slot->device) 646 pci_stop_and_remove_bus_device(dev); 647 648 list_for_each_entry(func, &slot->funcs, sibling) 649 acpiphp_bus_trim(func_to_handle(func)); 650 651 slot->flags &= (~SLOT_ENABLED); 652 } 653 654 static bool acpiphp_no_hotplug(acpi_handle handle) 655 { 656 struct acpi_device *adev = NULL; 657 658 acpi_bus_get_device(handle, &adev); 659 return adev && adev->flags.no_hotplug; 660 } 661 662 static bool slot_no_hotplug(struct acpiphp_slot *slot) 663 { 664 struct acpiphp_func *func; 665 666 list_for_each_entry(func, &slot->funcs, sibling) 667 if (acpiphp_no_hotplug(func_to_handle(func))) 668 return true; 669 670 return false; 671 } 672 673 /** 674 * get_slot_status - get ACPI slot status 675 * @slot: ACPI PHP slot 676 * 677 * If a slot has _STA for each function and if any one of them 678 * returned non-zero status, return it. 679 * 680 * If a slot doesn't have _STA and if any one of its functions' 681 * configuration space is configured, return 0x0f as a _STA. 682 * 683 * Otherwise return 0. 684 */ 685 static unsigned int get_slot_status(struct acpiphp_slot *slot) 686 { 687 unsigned long long sta = 0; 688 struct acpiphp_func *func; 689 690 list_for_each_entry(func, &slot->funcs, sibling) { 691 if (func->flags & FUNC_HAS_STA) { 692 acpi_status status; 693 694 status = acpi_evaluate_integer(func_to_handle(func), 695 "_STA", NULL, &sta); 696 if (ACPI_SUCCESS(status) && sta) 697 break; 698 } else { 699 u32 dvid; 700 701 pci_bus_read_config_dword(slot->bus, 702 PCI_DEVFN(slot->device, 703 func->function), 704 PCI_VENDOR_ID, &dvid); 705 if (dvid != 0xffffffff) { 706 sta = ACPI_STA_ALL; 707 break; 708 } 709 } 710 } 711 712 return (unsigned int)sta; 713 } 714 715 /** 716 * trim_stale_devices - remove PCI devices that are not responding. 717 * @dev: PCI device to start walking the hierarchy from. 718 */ 719 static void trim_stale_devices(struct pci_dev *dev) 720 { 721 acpi_handle handle = ACPI_HANDLE(&dev->dev); 722 struct pci_bus *bus = dev->subordinate; 723 bool alive = false; 724 725 if (handle) { 726 acpi_status status; 727 unsigned long long sta; 728 729 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 730 alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL) 731 || acpiphp_no_hotplug(handle); 732 } 733 if (!alive) { 734 u32 v; 735 736 /* Check if the device responds. */ 737 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); 738 } 739 if (!alive) { 740 pci_stop_and_remove_bus_device(dev); 741 if (handle) 742 acpiphp_bus_trim(handle); 743 } else if (bus) { 744 struct pci_dev *child, *tmp; 745 746 /* The device is a bridge. so check the bus below it. */ 747 pm_runtime_get_sync(&dev->dev); 748 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) 749 trim_stale_devices(child); 750 751 pm_runtime_put(&dev->dev); 752 } 753 } 754 755 /** 756 * acpiphp_check_bridge - re-enumerate devices 757 * @bridge: where to begin re-enumeration 758 * 759 * Iterate over all slots under this bridge and make sure that if a 760 * card is present they are enabled, and if not they are disabled. 761 */ 762 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 763 { 764 struct acpiphp_slot *slot; 765 766 /* Bail out if the bridge is going away. */ 767 if (bridge->is_going_away) 768 return; 769 770 list_for_each_entry(slot, &bridge->slots, node) { 771 struct pci_bus *bus = slot->bus; 772 struct pci_dev *dev, *tmp; 773 774 mutex_lock(&slot->crit_sect); 775 if (slot_no_hotplug(slot)) { 776 ; /* do nothing */ 777 } else if (get_slot_status(slot) == ACPI_STA_ALL) { 778 /* remove stale devices if any */ 779 list_for_each_entry_safe_reverse(dev, tmp, 780 &bus->devices, bus_list) 781 if (PCI_SLOT(dev->devfn) == slot->device) 782 trim_stale_devices(dev); 783 784 /* configure all functions */ 785 enable_slot(slot); 786 } else { 787 disable_slot(slot); 788 } 789 mutex_unlock(&slot->crit_sect); 790 } 791 } 792 793 static void acpiphp_set_hpp_values(struct pci_bus *bus) 794 { 795 struct pci_dev *dev; 796 797 list_for_each_entry(dev, &bus->devices, bus_list) 798 pci_configure_slot(dev); 799 } 800 801 /* 802 * Remove devices for which we could not assign resources, call 803 * arch specific code to fix-up the bus 804 */ 805 static void acpiphp_sanitize_bus(struct pci_bus *bus) 806 { 807 struct pci_dev *dev, *tmp; 808 int i; 809 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 810 811 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { 812 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 813 struct resource *res = &dev->resource[i]; 814 if ((res->flags & type_mask) && !res->start && 815 res->end) { 816 /* Could not assign a required resources 817 * for this device, remove it */ 818 pci_stop_and_remove_bus_device(dev); 819 break; 820 } 821 } 822 } 823 } 824 825 /* 826 * ACPI event handlers 827 */ 828 829 void acpiphp_check_host_bridge(acpi_handle handle) 830 { 831 struct acpiphp_bridge *bridge; 832 833 bridge = acpiphp_handle_to_bridge(handle); 834 if (bridge) { 835 pci_lock_rescan_remove(); 836 837 acpiphp_check_bridge(bridge); 838 839 pci_unlock_rescan_remove(); 840 put_bridge(bridge); 841 } 842 } 843 844 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); 845 846 static void hotplug_event(acpi_handle handle, u32 type, void *data) 847 { 848 struct acpiphp_context *context = data; 849 struct acpiphp_func *func = &context->func; 850 struct acpiphp_bridge *bridge; 851 char objname[64]; 852 struct acpi_buffer buffer = { .length = sizeof(objname), 853 .pointer = objname }; 854 855 mutex_lock(&acpiphp_context_lock); 856 bridge = context->bridge; 857 if (bridge) 858 get_bridge(bridge); 859 860 mutex_unlock(&acpiphp_context_lock); 861 862 pci_lock_rescan_remove(); 863 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 864 865 switch (type) { 866 case ACPI_NOTIFY_BUS_CHECK: 867 /* bus re-enumerate */ 868 pr_debug("%s: Bus check notify on %s\n", __func__, objname); 869 pr_debug("%s: re-enumerating slots under %s\n", 870 __func__, objname); 871 if (bridge) { 872 acpiphp_check_bridge(bridge); 873 } else { 874 struct acpiphp_slot *slot = func->slot; 875 876 if (slot->flags & SLOT_IS_GOING_AWAY) 877 break; 878 879 mutex_lock(&slot->crit_sect); 880 enable_slot(slot); 881 mutex_unlock(&slot->crit_sect); 882 } 883 break; 884 885 case ACPI_NOTIFY_DEVICE_CHECK: 886 /* device check */ 887 pr_debug("%s: Device check notify on %s\n", __func__, objname); 888 if (bridge) { 889 acpiphp_check_bridge(bridge); 890 } else { 891 struct acpiphp_slot *slot = func->slot; 892 int ret; 893 894 if (slot->flags & SLOT_IS_GOING_AWAY) 895 break; 896 897 /* 898 * Check if anything has changed in the slot and rescan 899 * from the parent if that's the case. 900 */ 901 mutex_lock(&slot->crit_sect); 902 ret = acpiphp_rescan_slot(slot); 903 mutex_unlock(&slot->crit_sect); 904 if (ret) 905 acpiphp_check_bridge(func->parent); 906 } 907 break; 908 909 case ACPI_NOTIFY_EJECT_REQUEST: 910 /* request device eject */ 911 pr_debug("%s: Device eject notify on %s\n", __func__, objname); 912 acpiphp_disable_and_eject_slot(func->slot); 913 break; 914 } 915 916 pci_unlock_rescan_remove(); 917 if (bridge) 918 put_bridge(bridge); 919 } 920 921 static void hotplug_event_work(void *data, u32 type) 922 { 923 struct acpiphp_context *context = data; 924 acpi_handle handle = context->handle; 925 926 acpi_scan_lock_acquire(); 927 928 hotplug_event(handle, type, context); 929 930 acpi_scan_lock_release(); 931 acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL); 932 put_bridge(context->func.parent); 933 } 934 935 /** 936 * handle_hotplug_event - handle ACPI hotplug event 937 * @handle: Notify()'ed acpi_handle 938 * @type: Notify code 939 * @data: pointer to acpiphp_context structure 940 * 941 * Handles ACPI event notification on slots. 942 */ 943 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 944 { 945 struct acpiphp_context *context; 946 u32 ost_code = ACPI_OST_SC_SUCCESS; 947 acpi_status status; 948 949 switch (type) { 950 case ACPI_NOTIFY_BUS_CHECK: 951 case ACPI_NOTIFY_DEVICE_CHECK: 952 break; 953 case ACPI_NOTIFY_EJECT_REQUEST: 954 ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS; 955 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 956 break; 957 958 case ACPI_NOTIFY_DEVICE_WAKE: 959 return; 960 961 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 962 acpi_handle_err(handle, "Device cannot be configured due " 963 "to a frequency mismatch\n"); 964 goto out; 965 966 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 967 acpi_handle_err(handle, "Device cannot be configured due " 968 "to a bus mode mismatch\n"); 969 goto out; 970 971 case ACPI_NOTIFY_POWER_FAULT: 972 acpi_handle_err(handle, "Device has suffered a power fault\n"); 973 goto out; 974 975 default: 976 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); 977 ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; 978 goto out; 979 } 980 981 mutex_lock(&acpiphp_context_lock); 982 context = acpiphp_get_context(handle); 983 if (!context || WARN_ON(context->handle != handle) 984 || context->func.parent->is_going_away) 985 goto err_out; 986 987 get_bridge(context->func.parent); 988 acpiphp_put_context(context); 989 status = acpi_hotplug_execute(hotplug_event_work, context, type); 990 if (ACPI_SUCCESS(status)) { 991 mutex_unlock(&acpiphp_context_lock); 992 return; 993 } 994 put_bridge(context->func.parent); 995 996 err_out: 997 mutex_unlock(&acpiphp_context_lock); 998 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 999 1000 out: 1001 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 1002 } 1003 1004 /** 1005 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. 1006 * @bus: PCI bus to enumerate the slots for. 1007 * 1008 * A "slot" is an object associated with a PCI device number. All functions 1009 * (PCI devices) with the same bus and device number belong to the same slot. 1010 */ 1011 void acpiphp_enumerate_slots(struct pci_bus *bus) 1012 { 1013 struct acpiphp_bridge *bridge; 1014 acpi_handle handle; 1015 acpi_status status; 1016 1017 if (acpiphp_disabled) 1018 return; 1019 1020 handle = ACPI_HANDLE(bus->bridge); 1021 if (!handle) 1022 return; 1023 1024 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 1025 if (!bridge) { 1026 acpi_handle_err(handle, "No memory for bridge object\n"); 1027 return; 1028 } 1029 1030 INIT_LIST_HEAD(&bridge->slots); 1031 kref_init(&bridge->ref); 1032 bridge->pci_dev = pci_dev_get(bus->self); 1033 bridge->pci_bus = bus; 1034 1035 /* 1036 * Grab a ref to the subordinate PCI bus in case the bus is 1037 * removed via PCI core logical hotplug. The ref pins the bus 1038 * (which we access during module unload). 1039 */ 1040 get_device(&bus->dev); 1041 1042 if (!pci_is_root_bus(bridge->pci_bus)) { 1043 struct acpiphp_context *context; 1044 1045 /* 1046 * This bridge should have been registered as a hotplug function 1047 * under its parent, so the context should be there, unless the 1048 * parent is going to be handled by pciehp, in which case this 1049 * bridge is not interesting to us either. 1050 */ 1051 mutex_lock(&acpiphp_context_lock); 1052 context = acpiphp_get_context(handle); 1053 if (!context) { 1054 mutex_unlock(&acpiphp_context_lock); 1055 put_device(&bus->dev); 1056 pci_dev_put(bridge->pci_dev); 1057 kfree(bridge); 1058 return; 1059 } 1060 bridge->context = context; 1061 context->bridge = bridge; 1062 /* Get a reference to the parent bridge. */ 1063 get_bridge(context->func.parent); 1064 mutex_unlock(&acpiphp_context_lock); 1065 } 1066 1067 /* must be added to the list prior to calling register_slot */ 1068 mutex_lock(&bridge_mutex); 1069 list_add(&bridge->list, &bridge_list); 1070 mutex_unlock(&bridge_mutex); 1071 1072 /* register all slot objects under this bridge */ 1073 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 1074 register_slot, NULL, bridge, NULL); 1075 if (ACPI_FAILURE(status)) { 1076 acpi_handle_err(handle, "failed to register slots\n"); 1077 cleanup_bridge(bridge); 1078 put_bridge(bridge); 1079 } 1080 } 1081 1082 /** 1083 * acpiphp_remove_slots - Remove slot objects associated with a given bus. 1084 * @bus: PCI bus to remove the slot objects for. 1085 */ 1086 void acpiphp_remove_slots(struct pci_bus *bus) 1087 { 1088 struct acpiphp_bridge *bridge; 1089 1090 if (acpiphp_disabled) 1091 return; 1092 1093 mutex_lock(&bridge_mutex); 1094 list_for_each_entry(bridge, &bridge_list, list) 1095 if (bridge->pci_bus == bus) { 1096 mutex_unlock(&bridge_mutex); 1097 cleanup_bridge(bridge); 1098 put_bridge(bridge); 1099 return; 1100 } 1101 1102 mutex_unlock(&bridge_mutex); 1103 } 1104 1105 /** 1106 * acpiphp_enable_slot - power on slot 1107 * @slot: ACPI PHP slot 1108 */ 1109 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1110 { 1111 pci_lock_rescan_remove(); 1112 1113 if (slot->flags & SLOT_IS_GOING_AWAY) 1114 return -ENODEV; 1115 1116 mutex_lock(&slot->crit_sect); 1117 /* configure all functions */ 1118 if (!(slot->flags & SLOT_ENABLED)) 1119 enable_slot(slot); 1120 1121 mutex_unlock(&slot->crit_sect); 1122 1123 pci_unlock_rescan_remove(); 1124 return 0; 1125 } 1126 1127 /** 1128 * acpiphp_disable_and_eject_slot - power off and eject slot 1129 * @slot: ACPI PHP slot 1130 */ 1131 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1132 { 1133 struct acpiphp_func *func; 1134 1135 if (slot->flags & SLOT_IS_GOING_AWAY) 1136 return -ENODEV; 1137 1138 mutex_lock(&slot->crit_sect); 1139 1140 /* unconfigure all functions */ 1141 disable_slot(slot); 1142 1143 list_for_each_entry(func, &slot->funcs, sibling) 1144 if (func->flags & FUNC_HAS_EJ0) { 1145 acpi_handle handle = func_to_handle(func); 1146 1147 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1148 acpi_handle_err(handle, "_EJ0 failed\n"); 1149 1150 break; 1151 } 1152 1153 mutex_unlock(&slot->crit_sect); 1154 return 0; 1155 } 1156 1157 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1158 { 1159 int ret; 1160 1161 pci_lock_rescan_remove(); 1162 ret = acpiphp_disable_and_eject_slot(slot); 1163 pci_unlock_rescan_remove(); 1164 return ret; 1165 } 1166 1167 /* 1168 * slot enabled: 1 1169 * slot disabled: 0 1170 */ 1171 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1172 { 1173 return (slot->flags & SLOT_ENABLED); 1174 } 1175 1176 /* 1177 * latch open: 1 1178 * latch closed: 0 1179 */ 1180 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1181 { 1182 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1183 } 1184 1185 /* 1186 * adapter presence : 1 1187 * absence : 0 1188 */ 1189 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1190 { 1191 return !!get_slot_status(slot); 1192 } 1193