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