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 /** 532 * enable_slot - enable, configure a slot 533 * @slot: slot to be enabled 534 * 535 * This function should be called per *physical slot*, 536 * not per each slot object in ACPI namespace. 537 */ 538 static void __ref enable_slot(struct acpiphp_slot *slot) 539 { 540 struct pci_dev *dev; 541 struct pci_bus *bus = slot->bus; 542 struct acpiphp_func *func; 543 int max, pass; 544 LIST_HEAD(add_list); 545 int nr_found; 546 547 list_for_each_entry(func, &slot->funcs, sibling) 548 acpiphp_bus_add(func_to_handle(func)); 549 550 nr_found = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 551 max = acpiphp_max_busnr(bus); 552 for (pass = 0; pass < 2; pass++) { 553 list_for_each_entry(dev, &bus->devices, bus_list) { 554 if (PCI_SLOT(dev->devfn) != slot->device) 555 continue; 556 557 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 558 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 559 max = pci_scan_bridge(bus, dev, max, pass); 560 if (pass && dev->subordinate) { 561 check_hotplug_bridge(slot, dev); 562 pcibios_resource_survey_bus(dev->subordinate); 563 __pci_bus_size_bridges(dev->subordinate, 564 &add_list); 565 } 566 } 567 } 568 } 569 __pci_bus_assign_resources(bus, &add_list, NULL); 570 /* Nothing more to do here if there are no new devices on this bus. */ 571 if (!nr_found && (slot->flags & SLOT_ENABLED)) 572 return; 573 574 acpiphp_sanitize_bus(bus); 575 acpiphp_set_hpp_values(bus); 576 acpiphp_set_acpi_region(slot); 577 pci_enable_bridges(bus); 578 579 list_for_each_entry(dev, &bus->devices, bus_list) { 580 /* Assume that newly added devices are powered on already. */ 581 if (!dev->is_added) 582 dev->current_state = PCI_D0; 583 } 584 585 pci_bus_add_devices(bus); 586 587 slot->flags |= SLOT_ENABLED; 588 list_for_each_entry(func, &slot->funcs, sibling) { 589 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 590 func->function)); 591 if (!dev) { 592 /* Do not set SLOT_ENABLED flag if some funcs 593 are not added. */ 594 slot->flags &= (~SLOT_ENABLED); 595 continue; 596 } 597 } 598 } 599 600 /* return first device in slot, acquiring a reference on it */ 601 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 602 { 603 struct pci_bus *bus = slot->bus; 604 struct pci_dev *dev; 605 struct pci_dev *ret = NULL; 606 607 down_read(&pci_bus_sem); 608 list_for_each_entry(dev, &bus->devices, bus_list) 609 if (PCI_SLOT(dev->devfn) == slot->device) { 610 ret = pci_dev_get(dev); 611 break; 612 } 613 up_read(&pci_bus_sem); 614 615 return ret; 616 } 617 618 /** 619 * disable_slot - disable a slot 620 * @slot: ACPI PHP slot 621 */ 622 static void disable_slot(struct acpiphp_slot *slot) 623 { 624 struct acpiphp_func *func; 625 struct pci_dev *pdev; 626 627 /* 628 * enable_slot() enumerates all functions in this device via 629 * pci_scan_slot(), whether they have associated ACPI hotplug 630 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 631 * here. 632 */ 633 while ((pdev = dev_in_slot(slot))) { 634 pci_stop_and_remove_bus_device(pdev); 635 pci_dev_put(pdev); 636 } 637 638 list_for_each_entry(func, &slot->funcs, sibling) 639 acpiphp_bus_trim(func_to_handle(func)); 640 641 slot->flags &= (~SLOT_ENABLED); 642 } 643 644 645 /** 646 * get_slot_status - get ACPI slot status 647 * @slot: ACPI PHP slot 648 * 649 * If a slot has _STA for each function and if any one of them 650 * returned non-zero status, return it. 651 * 652 * If a slot doesn't have _STA and if any one of its functions' 653 * configuration space is configured, return 0x0f as a _STA. 654 * 655 * Otherwise return 0. 656 */ 657 static unsigned int get_slot_status(struct acpiphp_slot *slot) 658 { 659 unsigned long long sta = 0; 660 struct acpiphp_func *func; 661 662 list_for_each_entry(func, &slot->funcs, sibling) { 663 if (func->flags & FUNC_HAS_STA) { 664 acpi_status status; 665 666 status = acpi_evaluate_integer(func_to_handle(func), 667 "_STA", NULL, &sta); 668 if (ACPI_SUCCESS(status) && sta) 669 break; 670 } else { 671 u32 dvid; 672 673 pci_bus_read_config_dword(slot->bus, 674 PCI_DEVFN(slot->device, 675 func->function), 676 PCI_VENDOR_ID, &dvid); 677 if (dvid != 0xffffffff) { 678 sta = ACPI_STA_ALL; 679 break; 680 } 681 } 682 } 683 684 return (unsigned int)sta; 685 } 686 687 /** 688 * trim_stale_devices - remove PCI devices that are not responding. 689 * @dev: PCI device to start walking the hierarchy from. 690 */ 691 static void trim_stale_devices(struct pci_dev *dev) 692 { 693 acpi_handle handle = ACPI_HANDLE(&dev->dev); 694 struct pci_bus *bus = dev->subordinate; 695 bool alive = false; 696 697 if (handle) { 698 acpi_status status; 699 unsigned long long sta; 700 701 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 702 alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL; 703 } 704 if (!alive) { 705 u32 v; 706 707 /* Check if the device responds. */ 708 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); 709 } 710 if (!alive) { 711 pci_stop_and_remove_bus_device(dev); 712 if (handle) 713 acpiphp_bus_trim(handle); 714 } else if (bus) { 715 struct pci_dev *child, *tmp; 716 717 /* The device is a bridge. so check the bus below it. */ 718 pm_runtime_get_sync(&dev->dev); 719 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) 720 trim_stale_devices(child); 721 722 pm_runtime_put(&dev->dev); 723 } 724 } 725 726 /** 727 * acpiphp_check_bridge - re-enumerate devices 728 * @bridge: where to begin re-enumeration 729 * 730 * Iterate over all slots under this bridge and make sure that if a 731 * card is present they are enabled, and if not they are disabled. 732 */ 733 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 734 { 735 struct acpiphp_slot *slot; 736 737 list_for_each_entry(slot, &bridge->slots, node) { 738 struct pci_bus *bus = slot->bus; 739 struct pci_dev *dev, *tmp; 740 741 mutex_lock(&slot->crit_sect); 742 /* wake up all functions */ 743 if (get_slot_status(slot) == ACPI_STA_ALL) { 744 /* remove stale devices if any */ 745 list_for_each_entry_safe(dev, tmp, &bus->devices, 746 bus_list) 747 if (PCI_SLOT(dev->devfn) == slot->device) 748 trim_stale_devices(dev); 749 750 /* configure all functions */ 751 enable_slot(slot); 752 } else { 753 disable_slot(slot); 754 } 755 mutex_unlock(&slot->crit_sect); 756 } 757 } 758 759 static void acpiphp_set_hpp_values(struct pci_bus *bus) 760 { 761 struct pci_dev *dev; 762 763 list_for_each_entry(dev, &bus->devices, bus_list) 764 pci_configure_slot(dev); 765 } 766 767 /* 768 * Remove devices for which we could not assign resources, call 769 * arch specific code to fix-up the bus 770 */ 771 static void acpiphp_sanitize_bus(struct pci_bus *bus) 772 { 773 struct pci_dev *dev, *tmp; 774 int i; 775 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 776 777 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 778 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 779 struct resource *res = &dev->resource[i]; 780 if ((res->flags & type_mask) && !res->start && 781 res->end) { 782 /* Could not assign a required resources 783 * for this device, remove it */ 784 pci_stop_and_remove_bus_device(dev); 785 break; 786 } 787 } 788 } 789 } 790 791 /* 792 * ACPI event handlers 793 */ 794 795 void acpiphp_check_host_bridge(acpi_handle handle) 796 { 797 struct acpiphp_bridge *bridge; 798 799 bridge = acpiphp_handle_to_bridge(handle); 800 if (bridge) { 801 acpiphp_check_bridge(bridge); 802 put_bridge(bridge); 803 } 804 } 805 806 static void hotplug_event(acpi_handle handle, u32 type, void *data) 807 { 808 struct acpiphp_context *context = data; 809 struct acpiphp_func *func = &context->func; 810 struct acpiphp_bridge *bridge; 811 char objname[64]; 812 struct acpi_buffer buffer = { .length = sizeof(objname), 813 .pointer = objname }; 814 815 mutex_lock(&acpiphp_context_lock); 816 bridge = context->bridge; 817 if (bridge) 818 get_bridge(bridge); 819 820 mutex_unlock(&acpiphp_context_lock); 821 822 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 823 824 switch (type) { 825 case ACPI_NOTIFY_BUS_CHECK: 826 /* bus re-enumerate */ 827 dbg("%s: Bus check notify on %s\n", __func__, objname); 828 dbg("%s: re-enumerating slots under %s\n", __func__, objname); 829 if (bridge) { 830 acpiphp_check_bridge(bridge); 831 } else { 832 struct acpiphp_slot *slot = func->slot; 833 834 mutex_lock(&slot->crit_sect); 835 enable_slot(slot); 836 mutex_unlock(&slot->crit_sect); 837 } 838 break; 839 840 case ACPI_NOTIFY_DEVICE_CHECK: 841 /* device check */ 842 dbg("%s: Device check notify on %s\n", __func__, objname); 843 if (bridge) 844 acpiphp_check_bridge(bridge); 845 else 846 acpiphp_check_bridge(func->parent); 847 848 break; 849 850 case ACPI_NOTIFY_EJECT_REQUEST: 851 /* request device eject */ 852 dbg("%s: Device eject notify on %s\n", __func__, objname); 853 acpiphp_disable_and_eject_slot(func->slot); 854 break; 855 } 856 857 if (bridge) 858 put_bridge(bridge); 859 } 860 861 static void hotplug_event_work(struct work_struct *work) 862 { 863 struct acpiphp_context *context; 864 struct acpi_hp_work *hp_work; 865 866 hp_work = container_of(work, struct acpi_hp_work, work); 867 context = hp_work->context; 868 acpi_scan_lock_acquire(); 869 870 hotplug_event(hp_work->handle, hp_work->type, context); 871 872 acpi_scan_lock_release(); 873 kfree(hp_work); /* allocated in handle_hotplug_event() */ 874 put_bridge(context->func.parent); 875 } 876 877 /** 878 * handle_hotplug_event - handle ACPI hotplug event 879 * @handle: Notify()'ed acpi_handle 880 * @type: Notify code 881 * @data: pointer to acpiphp_context structure 882 * 883 * Handles ACPI event notification on slots. 884 */ 885 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 886 { 887 struct acpiphp_context *context; 888 889 switch (type) { 890 case ACPI_NOTIFY_BUS_CHECK: 891 case ACPI_NOTIFY_DEVICE_CHECK: 892 case ACPI_NOTIFY_EJECT_REQUEST: 893 break; 894 895 case ACPI_NOTIFY_DEVICE_WAKE: 896 return; 897 898 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 899 acpi_handle_err(handle, "Device cannot be configured due " 900 "to a frequency mismatch\n"); 901 return; 902 903 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 904 acpi_handle_err(handle, "Device cannot be configured due " 905 "to a bus mode mismatch\n"); 906 return; 907 908 case ACPI_NOTIFY_POWER_FAULT: 909 acpi_handle_err(handle, "Device has suffered a power fault\n"); 910 return; 911 912 default: 913 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); 914 return; 915 } 916 917 mutex_lock(&acpiphp_context_lock); 918 context = acpiphp_get_context(handle); 919 if (context) { 920 get_bridge(context->func.parent); 921 acpiphp_put_context(context); 922 alloc_acpi_hp_work(handle, type, context, hotplug_event_work); 923 } 924 mutex_unlock(&acpiphp_context_lock); 925 } 926 927 /* 928 * Create hotplug slots for the PCI bus. 929 * It should always return 0 to avoid skipping following notifiers. 930 */ 931 void acpiphp_enumerate_slots(struct pci_bus *bus) 932 { 933 struct acpiphp_bridge *bridge; 934 acpi_handle handle; 935 acpi_status status; 936 937 if (acpiphp_disabled) 938 return; 939 940 handle = ACPI_HANDLE(bus->bridge); 941 if (!handle) 942 return; 943 944 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 945 if (!bridge) { 946 acpi_handle_err(handle, "No memory for bridge object\n"); 947 return; 948 } 949 950 INIT_LIST_HEAD(&bridge->slots); 951 kref_init(&bridge->ref); 952 bridge->pci_dev = pci_dev_get(bus->self); 953 bridge->pci_bus = bus; 954 955 /* 956 * Grab a ref to the subordinate PCI bus in case the bus is 957 * removed via PCI core logical hotplug. The ref pins the bus 958 * (which we access during module unload). 959 */ 960 get_device(&bus->dev); 961 962 if (!pci_is_root_bus(bridge->pci_bus)) { 963 struct acpiphp_context *context; 964 965 /* 966 * This bridge should have been registered as a hotplug function 967 * under its parent, so the context has to be there. If not, we 968 * are in deep goo. 969 */ 970 mutex_lock(&acpiphp_context_lock); 971 context = acpiphp_get_context(handle); 972 if (WARN_ON(!context)) { 973 mutex_unlock(&acpiphp_context_lock); 974 put_device(&bus->dev); 975 kfree(bridge); 976 return; 977 } 978 bridge->context = context; 979 context->bridge = bridge; 980 /* Get a reference to the parent bridge. */ 981 get_bridge(context->func.parent); 982 mutex_unlock(&acpiphp_context_lock); 983 } 984 985 /* must be added to the list prior to calling register_slot */ 986 mutex_lock(&bridge_mutex); 987 list_add(&bridge->list, &bridge_list); 988 mutex_unlock(&bridge_mutex); 989 990 /* register all slot objects under this bridge */ 991 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 992 register_slot, NULL, bridge, NULL); 993 if (ACPI_FAILURE(status)) { 994 acpi_handle_err(handle, "failed to register slots\n"); 995 cleanup_bridge(bridge); 996 put_bridge(bridge); 997 } 998 } 999 1000 /* Destroy hotplug slots associated with the PCI bus */ 1001 void acpiphp_remove_slots(struct pci_bus *bus) 1002 { 1003 struct acpiphp_bridge *bridge; 1004 1005 if (acpiphp_disabled) 1006 return; 1007 1008 mutex_lock(&bridge_mutex); 1009 list_for_each_entry(bridge, &bridge_list, list) 1010 if (bridge->pci_bus == bus) { 1011 mutex_unlock(&bridge_mutex); 1012 cleanup_bridge(bridge); 1013 put_bridge(bridge); 1014 return; 1015 } 1016 1017 mutex_unlock(&bridge_mutex); 1018 } 1019 1020 /** 1021 * acpiphp_enable_slot - power on slot 1022 * @slot: ACPI PHP slot 1023 */ 1024 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1025 { 1026 mutex_lock(&slot->crit_sect); 1027 /* configure all functions */ 1028 if (!(slot->flags & SLOT_ENABLED)) 1029 enable_slot(slot); 1030 1031 mutex_unlock(&slot->crit_sect); 1032 return 0; 1033 } 1034 1035 /** 1036 * acpiphp_disable_and_eject_slot - power off and eject slot 1037 * @slot: ACPI PHP slot 1038 */ 1039 int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1040 { 1041 struct acpiphp_func *func; 1042 int retval = 0; 1043 1044 mutex_lock(&slot->crit_sect); 1045 1046 /* unconfigure all functions */ 1047 disable_slot(slot); 1048 1049 list_for_each_entry(func, &slot->funcs, sibling) 1050 if (func->flags & FUNC_HAS_EJ0) { 1051 acpi_handle handle = func_to_handle(func); 1052 1053 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1054 acpi_handle_err(handle, "_EJ0 failed\n"); 1055 1056 break; 1057 } 1058 1059 mutex_unlock(&slot->crit_sect); 1060 return retval; 1061 } 1062 1063 1064 /* 1065 * slot enabled: 1 1066 * slot disabled: 0 1067 */ 1068 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1069 { 1070 return (slot->flags & SLOT_ENABLED); 1071 } 1072 1073 1074 /* 1075 * latch open: 1 1076 * latch closed: 0 1077 */ 1078 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1079 { 1080 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1081 } 1082 1083 1084 /* 1085 * adapter presence : 1 1086 * absence : 0 1087 */ 1088 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1089 { 1090 return !!get_slot_status(slot); 1091 } 1092