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 mutex_lock(&bridge_mutex); 327 list_add_tail(&slot->node, &bridge->slots); 328 mutex_unlock(&bridge_mutex); 329 330 /* Register slots for ejectable funtions only. */ 331 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { 332 unsigned long long sun; 333 int retval; 334 335 bridge->nr_slots++; 336 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 337 if (ACPI_FAILURE(status)) 338 sun = bridge->nr_slots; 339 340 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 341 sun, pci_domain_nr(pbus), pbus->number, device); 342 343 retval = acpiphp_register_hotplug_slot(slot, sun); 344 if (retval) { 345 bridge->nr_slots--; 346 if (retval == -EBUSY) 347 warn("Slot %llu already registered by another " 348 "hotplug driver\n", sun); 349 else 350 warn("acpiphp_register_hotplug_slot failed " 351 "(err code = 0x%x)\n", retval); 352 } 353 /* Even if the slot registration fails, we can still use it. */ 354 } 355 356 slot_found: 357 newfunc->slot = slot; 358 mutex_lock(&bridge_mutex); 359 list_add_tail(&newfunc->sibling, &slot->funcs); 360 mutex_unlock(&bridge_mutex); 361 362 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 363 &val, 60*1000)) 364 slot->flags |= SLOT_ENABLED; 365 366 if (is_dock_device(handle)) { 367 /* we don't want to call this device's _EJ0 368 * because we want the dock notify handler 369 * to call it after it calls _DCK 370 */ 371 newfunc->flags &= ~FUNC_HAS_EJ0; 372 if (register_hotplug_dock_device(handle, 373 &acpiphp_dock_ops, context, 374 acpiphp_dock_init, acpiphp_dock_release)) 375 dbg("failed to register dock device\n"); 376 } 377 378 /* install notify handler */ 379 if (!(newfunc->flags & FUNC_HAS_DCK)) { 380 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 381 handle_hotplug_event, 382 context); 383 if (ACPI_FAILURE(status)) 384 acpi_handle_err(handle, 385 "failed to install notify handler\n"); 386 } 387 388 return AE_OK; 389 390 err: 391 mutex_lock(&acpiphp_context_lock); 392 acpiphp_put_context(context); 393 mutex_unlock(&acpiphp_context_lock); 394 return status; 395 } 396 397 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 398 { 399 struct acpiphp_context *context; 400 struct acpiphp_bridge *bridge = NULL; 401 402 mutex_lock(&acpiphp_context_lock); 403 context = acpiphp_get_context(handle); 404 if (context) { 405 bridge = context->bridge; 406 if (bridge) 407 get_bridge(bridge); 408 409 acpiphp_put_context(context); 410 } 411 mutex_unlock(&acpiphp_context_lock); 412 return bridge; 413 } 414 415 static void cleanup_bridge(struct acpiphp_bridge *bridge) 416 { 417 struct acpiphp_slot *slot; 418 struct acpiphp_func *func; 419 acpi_status status; 420 421 list_for_each_entry(slot, &bridge->slots, node) { 422 list_for_each_entry(func, &slot->funcs, sibling) { 423 acpi_handle handle = func_to_handle(func); 424 425 if (is_dock_device(handle)) 426 unregister_hotplug_dock_device(handle); 427 428 if (!(func->flags & FUNC_HAS_DCK)) { 429 status = acpi_remove_notify_handler(handle, 430 ACPI_SYSTEM_NOTIFY, 431 handle_hotplug_event); 432 if (ACPI_FAILURE(status)) 433 err("failed to remove notify handler\n"); 434 } 435 } 436 acpiphp_unregister_hotplug_slot(slot); 437 } 438 439 mutex_lock(&bridge_mutex); 440 list_del(&bridge->list); 441 mutex_unlock(&bridge_mutex); 442 } 443 444 /** 445 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 446 * @bus: bus to start search with 447 */ 448 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 449 { 450 struct list_head *tmp; 451 unsigned char max, n; 452 453 /* 454 * pci_bus_max_busnr will return the highest 455 * reserved busnr for all these children. 456 * that is equivalent to the bus->subordinate 457 * value. We don't want to use the parent's 458 * bus->subordinate value because it could have 459 * padding in it. 460 */ 461 max = bus->busn_res.start; 462 463 list_for_each(tmp, &bus->children) { 464 n = pci_bus_max_busnr(pci_bus_b(tmp)); 465 if (n > max) 466 max = n; 467 } 468 return max; 469 } 470 471 /** 472 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. 473 * @handle: ACPI device object handle to start from. 474 */ 475 static void acpiphp_bus_trim(acpi_handle handle) 476 { 477 struct acpi_device *adev = NULL; 478 479 acpi_bus_get_device(handle, &adev); 480 if (adev) 481 acpi_bus_trim(adev); 482 } 483 484 /** 485 * acpiphp_bus_add - Scan ACPI namespace subtree. 486 * @handle: ACPI object handle to start the scan from. 487 */ 488 static void acpiphp_bus_add(acpi_handle handle) 489 { 490 struct acpi_device *adev = NULL; 491 492 acpiphp_bus_trim(handle); 493 acpi_bus_scan(handle); 494 acpi_bus_get_device(handle, &adev); 495 if (adev) 496 acpi_device_set_power(adev, ACPI_STATE_D0); 497 } 498 499 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 500 { 501 struct acpiphp_func *func; 502 union acpi_object params[2]; 503 struct acpi_object_list arg_list; 504 505 list_for_each_entry(func, &slot->funcs, sibling) { 506 arg_list.count = 2; 507 arg_list.pointer = params; 508 params[0].type = ACPI_TYPE_INTEGER; 509 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 510 params[1].type = ACPI_TYPE_INTEGER; 511 params[1].integer.value = 1; 512 /* _REG is optional, we don't care about if there is failure */ 513 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, 514 NULL); 515 } 516 } 517 518 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 519 { 520 struct acpiphp_func *func; 521 522 /* quirk, or pcie could set it already */ 523 if (dev->is_hotplug_bridge) 524 return; 525 526 list_for_each_entry(func, &slot->funcs, sibling) { 527 if (PCI_FUNC(dev->devfn) == func->function) { 528 dev->is_hotplug_bridge = 1; 529 break; 530 } 531 } 532 } 533 534 /** 535 * enable_device - enable, configure a slot 536 * @slot: slot to be enabled 537 * 538 * This function should be called per *physical slot*, 539 * not per each slot object in ACPI namespace. 540 */ 541 static int __ref enable_device(struct acpiphp_slot *slot) 542 { 543 struct pci_dev *dev; 544 struct pci_bus *bus = slot->bus; 545 struct acpiphp_func *func; 546 int max, pass; 547 LIST_HEAD(add_list); 548 549 list_for_each_entry(func, &slot->funcs, sibling) 550 acpiphp_bus_add(func_to_handle(func)); 551 552 pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 553 554 max = acpiphp_max_busnr(bus); 555 for (pass = 0; pass < 2; pass++) { 556 list_for_each_entry(dev, &bus->devices, bus_list) { 557 if (PCI_SLOT(dev->devfn) != slot->device) 558 continue; 559 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 560 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 561 max = pci_scan_bridge(bus, dev, max, pass); 562 if (pass && dev->subordinate) { 563 check_hotplug_bridge(slot, dev); 564 pcibios_resource_survey_bus(dev->subordinate); 565 __pci_bus_size_bridges(dev->subordinate, 566 &add_list); 567 } 568 } 569 } 570 } 571 572 __pci_bus_assign_resources(bus, &add_list, NULL); 573 acpiphp_sanitize_bus(bus); 574 acpiphp_set_hpp_values(bus); 575 acpiphp_set_acpi_region(slot); 576 pci_enable_bridges(bus); 577 578 list_for_each_entry(dev, &bus->devices, bus_list) { 579 /* Assume that newly added devices are powered on already. */ 580 if (!dev->is_added) 581 dev->current_state = PCI_D0; 582 } 583 584 pci_bus_add_devices(bus); 585 586 slot->flags |= SLOT_ENABLED; 587 list_for_each_entry(func, &slot->funcs, sibling) { 588 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 589 func->function)); 590 if (!dev) { 591 /* Do not set SLOT_ENABLED flag if some funcs 592 are not added. */ 593 slot->flags &= (~SLOT_ENABLED); 594 continue; 595 } 596 } 597 598 return 0; 599 } 600 601 /* return first device in slot, acquiring a reference on it */ 602 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 603 { 604 struct pci_bus *bus = slot->bus; 605 struct pci_dev *dev; 606 struct pci_dev *ret = NULL; 607 608 down_read(&pci_bus_sem); 609 list_for_each_entry(dev, &bus->devices, bus_list) 610 if (PCI_SLOT(dev->devfn) == slot->device) { 611 ret = pci_dev_get(dev); 612 break; 613 } 614 up_read(&pci_bus_sem); 615 616 return ret; 617 } 618 619 /** 620 * disable_device - disable a slot 621 * @slot: ACPI PHP slot 622 */ 623 static int disable_device(struct acpiphp_slot *slot) 624 { 625 struct acpiphp_func *func; 626 struct pci_dev *pdev; 627 628 /* 629 * enable_device() enumerates all functions in this device via 630 * pci_scan_slot(), whether they have associated ACPI hotplug 631 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 632 * here. 633 */ 634 while ((pdev = dev_in_slot(slot))) { 635 pci_stop_and_remove_bus_device(pdev); 636 pci_dev_put(pdev); 637 } 638 639 list_for_each_entry(func, &slot->funcs, sibling) 640 acpiphp_bus_trim(func_to_handle(func)); 641 642 slot->flags &= (~SLOT_ENABLED); 643 644 return 0; 645 } 646 647 648 /** 649 * get_slot_status - get ACPI slot status 650 * @slot: ACPI PHP slot 651 * 652 * If a slot has _STA for each function and if any one of them 653 * returned non-zero status, return it. 654 * 655 * If a slot doesn't have _STA and if any one of its functions' 656 * configuration space is configured, return 0x0f as a _STA. 657 * 658 * Otherwise return 0. 659 */ 660 static unsigned int get_slot_status(struct acpiphp_slot *slot) 661 { 662 unsigned long long sta = 0; 663 struct acpiphp_func *func; 664 665 list_for_each_entry(func, &slot->funcs, sibling) { 666 if (func->flags & FUNC_HAS_STA) { 667 acpi_status status; 668 669 status = acpi_evaluate_integer(func_to_handle(func), 670 "_STA", NULL, &sta); 671 if (ACPI_SUCCESS(status) && sta) 672 break; 673 } else { 674 u32 dvid; 675 676 pci_bus_read_config_dword(slot->bus, 677 PCI_DEVFN(slot->device, 678 func->function), 679 PCI_VENDOR_ID, &dvid); 680 if (dvid != 0xffffffff) { 681 sta = ACPI_STA_ALL; 682 break; 683 } 684 } 685 } 686 687 return (unsigned int)sta; 688 } 689 690 /** 691 * trim_stale_devices - remove PCI devices that are not responding. 692 * @dev: PCI device to start walking the hierarchy from. 693 */ 694 static void trim_stale_devices(struct pci_dev *dev) 695 { 696 acpi_handle handle = ACPI_HANDLE(&dev->dev); 697 struct pci_bus *bus = dev->subordinate; 698 bool alive = false; 699 700 if (handle) { 701 acpi_status status; 702 unsigned long long sta; 703 704 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 705 alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL; 706 } 707 if (!alive) { 708 u32 v; 709 710 /* Check if the device responds. */ 711 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); 712 } 713 if (!alive) { 714 pci_stop_and_remove_bus_device(dev); 715 if (handle) 716 acpiphp_bus_trim(handle); 717 } else if (bus) { 718 struct pci_dev *child, *tmp; 719 720 /* The device is a bridge. so check the bus below it. */ 721 pm_runtime_get_sync(&dev->dev); 722 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) 723 trim_stale_devices(child); 724 725 pm_runtime_put(&dev->dev); 726 } 727 } 728 729 /** 730 * acpiphp_check_bridge - re-enumerate devices 731 * @bridge: where to begin re-enumeration 732 * 733 * Iterate over all slots under this bridge and make sure that if a 734 * card is present they are enabled, and if not they are disabled. 735 */ 736 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 737 { 738 struct acpiphp_slot *slot; 739 740 list_for_each_entry(slot, &bridge->slots, node) { 741 struct pci_bus *bus = slot->bus; 742 struct pci_dev *dev, *tmp; 743 744 mutex_lock(&slot->crit_sect); 745 /* wake up all functions */ 746 if (get_slot_status(slot) == ACPI_STA_ALL) { 747 /* remove stale devices if any */ 748 list_for_each_entry_safe(dev, tmp, &bus->devices, 749 bus_list) 750 if (PCI_SLOT(dev->devfn) == slot->device) 751 trim_stale_devices(dev); 752 753 /* configure all functions */ 754 enable_device(slot); 755 } else { 756 disable_device(slot); 757 } 758 mutex_unlock(&slot->crit_sect); 759 } 760 } 761 762 static void acpiphp_set_hpp_values(struct pci_bus *bus) 763 { 764 struct pci_dev *dev; 765 766 list_for_each_entry(dev, &bus->devices, bus_list) 767 pci_configure_slot(dev); 768 } 769 770 /* 771 * Remove devices for which we could not assign resources, call 772 * arch specific code to fix-up the bus 773 */ 774 static void acpiphp_sanitize_bus(struct pci_bus *bus) 775 { 776 struct pci_dev *dev, *tmp; 777 int i; 778 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 779 780 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 781 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 782 struct resource *res = &dev->resource[i]; 783 if ((res->flags & type_mask) && !res->start && 784 res->end) { 785 /* Could not assign a required resources 786 * for this device, remove it */ 787 pci_stop_and_remove_bus_device(dev); 788 break; 789 } 790 } 791 } 792 } 793 794 /* 795 * ACPI event handlers 796 */ 797 798 static acpi_status 799 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 800 { 801 struct acpiphp_bridge *bridge; 802 char objname[64]; 803 struct acpi_buffer buffer = { .length = sizeof(objname), 804 .pointer = objname }; 805 806 bridge = acpiphp_handle_to_bridge(handle); 807 if (bridge) { 808 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 809 dbg("%s: re-enumerating slots under %s\n", 810 __func__, objname); 811 acpiphp_check_bridge(bridge); 812 put_bridge(bridge); 813 } 814 return AE_OK ; 815 } 816 817 void acpiphp_check_host_bridge(acpi_handle handle) 818 { 819 struct acpiphp_bridge *bridge; 820 821 bridge = acpiphp_handle_to_bridge(handle); 822 if (bridge) { 823 acpiphp_check_bridge(bridge); 824 put_bridge(bridge); 825 } 826 827 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 828 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 829 } 830 831 static void hotplug_event(acpi_handle handle, u32 type, void *data) 832 { 833 struct acpiphp_context *context = data; 834 struct acpiphp_func *func = &context->func; 835 struct acpiphp_bridge *bridge; 836 char objname[64]; 837 struct acpi_buffer buffer = { .length = sizeof(objname), 838 .pointer = objname }; 839 840 mutex_lock(&acpiphp_context_lock); 841 bridge = context->bridge; 842 if (bridge) 843 get_bridge(bridge); 844 845 mutex_unlock(&acpiphp_context_lock); 846 847 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 848 849 switch (type) { 850 case ACPI_NOTIFY_BUS_CHECK: 851 /* bus re-enumerate */ 852 dbg("%s: Bus check notify on %s\n", __func__, objname); 853 dbg("%s: re-enumerating slots under %s\n", __func__, objname); 854 if (bridge) { 855 acpiphp_check_bridge(bridge); 856 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 857 ACPI_UINT32_MAX, check_sub_bridges, 858 NULL, NULL, NULL); 859 } else { 860 struct acpiphp_slot *slot = func->slot; 861 862 mutex_lock(&slot->crit_sect); 863 enable_device(slot); 864 mutex_unlock(&slot->crit_sect); 865 } 866 break; 867 868 case ACPI_NOTIFY_DEVICE_CHECK: 869 /* device check */ 870 dbg("%s: Device check notify on %s\n", __func__, objname); 871 if (bridge) 872 acpiphp_check_bridge(bridge); 873 else 874 acpiphp_check_bridge(func->parent); 875 876 break; 877 878 case ACPI_NOTIFY_EJECT_REQUEST: 879 /* request device eject */ 880 dbg("%s: Device eject notify on %s\n", __func__, objname); 881 acpiphp_disable_and_eject_slot(func->slot); 882 break; 883 } 884 885 if (bridge) 886 put_bridge(bridge); 887 } 888 889 static void hotplug_event_work(struct work_struct *work) 890 { 891 struct acpiphp_context *context; 892 struct acpi_hp_work *hp_work; 893 894 hp_work = container_of(work, struct acpi_hp_work, work); 895 context = hp_work->context; 896 acpi_scan_lock_acquire(); 897 898 hotplug_event(hp_work->handle, hp_work->type, context); 899 900 acpi_scan_lock_release(); 901 kfree(hp_work); /* allocated in handle_hotplug_event() */ 902 put_bridge(context->func.parent); 903 } 904 905 /** 906 * handle_hotplug_event - handle ACPI hotplug event 907 * @handle: Notify()'ed acpi_handle 908 * @type: Notify code 909 * @data: pointer to acpiphp_context structure 910 * 911 * Handles ACPI event notification on slots. 912 */ 913 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 914 { 915 struct acpiphp_context *context; 916 917 switch (type) { 918 case ACPI_NOTIFY_BUS_CHECK: 919 case ACPI_NOTIFY_DEVICE_CHECK: 920 case ACPI_NOTIFY_EJECT_REQUEST: 921 break; 922 923 case ACPI_NOTIFY_DEVICE_WAKE: 924 return; 925 926 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 927 acpi_handle_err(handle, "Device cannot be configured due " 928 "to a frequency mismatch\n"); 929 return; 930 931 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 932 acpi_handle_err(handle, "Device cannot be configured due " 933 "to a bus mode mismatch\n"); 934 return; 935 936 case ACPI_NOTIFY_POWER_FAULT: 937 acpi_handle_err(handle, "Device has suffered a power fault\n"); 938 return; 939 940 default: 941 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); 942 return; 943 } 944 945 mutex_lock(&acpiphp_context_lock); 946 context = acpiphp_get_context(handle); 947 if (context) { 948 get_bridge(context->func.parent); 949 acpiphp_put_context(context); 950 alloc_acpi_hp_work(handle, type, context, hotplug_event_work); 951 } 952 mutex_unlock(&acpiphp_context_lock); 953 } 954 955 /* 956 * Create hotplug slots for the PCI bus. 957 * It should always return 0 to avoid skipping following notifiers. 958 */ 959 void acpiphp_enumerate_slots(struct pci_bus *bus) 960 { 961 struct acpiphp_bridge *bridge; 962 acpi_handle handle; 963 acpi_status status; 964 965 if (acpiphp_disabled) 966 return; 967 968 handle = ACPI_HANDLE(bus->bridge); 969 if (!handle) 970 return; 971 972 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 973 if (!bridge) { 974 acpi_handle_err(handle, "No memory for bridge object\n"); 975 return; 976 } 977 978 INIT_LIST_HEAD(&bridge->slots); 979 kref_init(&bridge->ref); 980 bridge->pci_dev = pci_dev_get(bus->self); 981 bridge->pci_bus = bus; 982 983 /* 984 * Grab a ref to the subordinate PCI bus in case the bus is 985 * removed via PCI core logical hotplug. The ref pins the bus 986 * (which we access during module unload). 987 */ 988 get_device(&bus->dev); 989 990 if (!pci_is_root_bus(bridge->pci_bus)) { 991 struct acpiphp_context *context; 992 993 /* 994 * This bridge should have been registered as a hotplug function 995 * under its parent, so the context has to be there. If not, we 996 * are in deep goo. 997 */ 998 mutex_lock(&acpiphp_context_lock); 999 context = acpiphp_get_context(handle); 1000 if (WARN_ON(!context)) { 1001 mutex_unlock(&acpiphp_context_lock); 1002 put_device(&bus->dev); 1003 kfree(bridge); 1004 return; 1005 } 1006 bridge->context = context; 1007 context->bridge = bridge; 1008 /* Get a reference to the parent bridge. */ 1009 get_bridge(context->func.parent); 1010 mutex_unlock(&acpiphp_context_lock); 1011 } 1012 1013 /* must be added to the list prior to calling register_slot */ 1014 mutex_lock(&bridge_mutex); 1015 list_add(&bridge->list, &bridge_list); 1016 mutex_unlock(&bridge_mutex); 1017 1018 /* register all slot objects under this bridge */ 1019 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 1020 register_slot, NULL, bridge, NULL); 1021 if (ACPI_FAILURE(status)) { 1022 acpi_handle_err(handle, "failed to register slots\n"); 1023 cleanup_bridge(bridge); 1024 put_bridge(bridge); 1025 } 1026 } 1027 1028 /* Destroy hotplug slots associated with the PCI bus */ 1029 void acpiphp_remove_slots(struct pci_bus *bus) 1030 { 1031 struct acpiphp_bridge *bridge, *tmp; 1032 1033 if (acpiphp_disabled) 1034 return; 1035 1036 list_for_each_entry_safe(bridge, tmp, &bridge_list, list) 1037 if (bridge->pci_bus == bus) { 1038 cleanup_bridge(bridge); 1039 put_bridge(bridge); 1040 break; 1041 } 1042 } 1043 1044 /** 1045 * acpiphp_enable_slot - power on slot 1046 * @slot: ACPI PHP slot 1047 */ 1048 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1049 { 1050 int retval = 0; 1051 1052 mutex_lock(&slot->crit_sect); 1053 1054 /* configure all functions */ 1055 if (!(slot->flags & SLOT_ENABLED)) 1056 retval = enable_device(slot); 1057 1058 mutex_unlock(&slot->crit_sect); 1059 return retval; 1060 } 1061 1062 /** 1063 * acpiphp_disable_and_eject_slot - power off and eject slot 1064 * @slot: ACPI PHP slot 1065 */ 1066 int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1067 { 1068 struct acpiphp_func *func; 1069 int retval = 0; 1070 1071 mutex_lock(&slot->crit_sect); 1072 1073 /* unconfigure all functions */ 1074 retval = disable_device(slot); 1075 if (retval) 1076 goto err_exit; 1077 1078 list_for_each_entry(func, &slot->funcs, sibling) 1079 if (func->flags & FUNC_HAS_EJ0) { 1080 acpi_handle handle = func_to_handle(func); 1081 1082 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1083 acpi_handle_err(handle, "_EJ0 failed\n"); 1084 1085 break; 1086 } 1087 1088 err_exit: 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 unsigned int sta; 1111 1112 sta = get_slot_status(slot); 1113 1114 return (sta & ACPI_STA_DEVICE_UI) ? 0 : 1; 1115 } 1116 1117 1118 /* 1119 * adapter presence : 1 1120 * absence : 0 1121 */ 1122 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1123 { 1124 unsigned int sta; 1125 1126 sta = get_slot_status(slot); 1127 1128 return (sta == 0) ? 0 : 1; 1129 } 1130