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/mutex.h> 50 #include <linux/slab.h> 51 #include <linux/acpi.h> 52 53 #include "../pci.h" 54 #include "acpiphp.h" 55 56 static LIST_HEAD(bridge_list); 57 static DEFINE_MUTEX(bridge_mutex); 58 59 #define MY_NAME "acpiphp_glue" 60 61 static void handle_hotplug_event_bridge (acpi_handle, u32, void *); 62 static void acpiphp_sanitize_bus(struct pci_bus *bus); 63 static void acpiphp_set_hpp_values(struct pci_bus *bus); 64 static void hotplug_event_func(acpi_handle handle, u32 type, void *context); 65 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); 66 static void free_bridge(struct kref *kref); 67 68 /* callback routine to check for the existence of a pci dock device */ 69 static acpi_status 70 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) 71 { 72 int *count = (int *)context; 73 74 if (is_dock_device(handle)) { 75 (*count)++; 76 return AE_CTRL_TERMINATE; 77 } else { 78 return AE_OK; 79 } 80 } 81 82 static inline void get_bridge(struct acpiphp_bridge *bridge) 83 { 84 kref_get(&bridge->ref); 85 } 86 87 static inline void put_bridge(struct acpiphp_bridge *bridge) 88 { 89 kref_put(&bridge->ref, free_bridge); 90 } 91 92 static void free_bridge(struct kref *kref) 93 { 94 struct acpiphp_bridge *bridge; 95 struct acpiphp_slot *slot, *next; 96 struct acpiphp_func *func, *tmp; 97 98 bridge = container_of(kref, struct acpiphp_bridge, ref); 99 100 list_for_each_entry_safe(slot, next, &bridge->slots, node) { 101 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) { 102 kfree(func); 103 } 104 kfree(slot); 105 } 106 107 /* Release reference acquired by acpiphp_bridge_handle_to_function() */ 108 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) 109 put_bridge(bridge->func->slot->bridge); 110 put_device(&bridge->pci_bus->dev); 111 pci_dev_put(bridge->pci_dev); 112 kfree(bridge); 113 } 114 115 /* 116 * the _DCK method can do funny things... and sometimes not 117 * hah-hah funny. 118 * 119 * TBD - figure out a way to only call fixups for 120 * systems that require them. 121 */ 122 static int post_dock_fixups(struct notifier_block *nb, unsigned long val, 123 void *v) 124 { 125 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); 126 struct pci_bus *bus = func->slot->bridge->pci_bus; 127 u32 buses; 128 129 if (!bus->self) 130 return NOTIFY_OK; 131 132 /* fixup bad _DCK function that rewrites 133 * secondary bridge on slot 134 */ 135 pci_read_config_dword(bus->self, 136 PCI_PRIMARY_BUS, 137 &buses); 138 139 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 140 buses = (buses & 0xff000000) 141 | ((unsigned int)(bus->primary) << 0) 142 | ((unsigned int)(bus->busn_res.start) << 8) 143 | ((unsigned int)(bus->busn_res.end) << 16); 144 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 145 } 146 return NOTIFY_OK; 147 } 148 149 150 static const struct acpi_dock_ops acpiphp_dock_ops = { 151 .handler = hotplug_event_func, 152 }; 153 154 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 155 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 156 { 157 u32 reg32; 158 acpi_handle tmp; 159 struct acpi_pci_root *root; 160 161 /* Check whether the PCIe port supports native PCIe hotplug */ 162 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 163 return false; 164 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 165 return false; 166 167 /* 168 * Check whether native PCIe hotplug has been enabled for 169 * this PCIe hierarchy. 170 */ 171 tmp = acpi_find_root_bridge_handle(pdev); 172 if (!tmp) 173 return false; 174 root = acpi_pci_find_root(tmp); 175 if (!root) 176 return false; 177 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 178 return false; 179 180 return true; 181 } 182 183 static void acpiphp_dock_init(void *data) 184 { 185 struct acpiphp_func *func = data; 186 187 get_bridge(func->slot->bridge); 188 } 189 190 static void acpiphp_dock_release(void *data) 191 { 192 struct acpiphp_func *func = data; 193 194 put_bridge(func->slot->bridge); 195 } 196 197 /* callback routine to register each ACPI PCI slot object */ 198 static acpi_status 199 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 200 { 201 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 202 struct acpiphp_slot *slot; 203 struct acpiphp_func *newfunc; 204 acpi_handle tmp; 205 acpi_status status = AE_OK; 206 unsigned long long adr, sun; 207 int device, function, retval, found = 0; 208 struct pci_bus *pbus = bridge->pci_bus; 209 struct pci_dev *pdev; 210 u32 val; 211 212 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) 213 return AE_OK; 214 215 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 216 if (ACPI_FAILURE(status)) { 217 warn("can't evaluate _ADR (%#x)\n", status); 218 return AE_OK; 219 } 220 221 device = (adr >> 16) & 0xffff; 222 function = adr & 0xffff; 223 224 pdev = bridge->pci_dev; 225 if (pdev && device_is_managed_by_native_pciehp(pdev)) 226 return AE_OK; 227 228 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 229 if (!newfunc) 230 return AE_NO_MEMORY; 231 232 newfunc->handle = handle; 233 newfunc->function = function; 234 235 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) 236 newfunc->flags = FUNC_HAS_EJ0; 237 238 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 239 newfunc->flags |= FUNC_HAS_STA; 240 241 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 242 newfunc->flags |= FUNC_HAS_PS0; 243 244 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 245 newfunc->flags |= FUNC_HAS_PS3; 246 247 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 248 newfunc->flags |= FUNC_HAS_DCK; 249 250 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 251 if (ACPI_FAILURE(status)) { 252 /* 253 * use the count of the number of slots we've found 254 * for the number of the slot 255 */ 256 sun = bridge->nr_slots+1; 257 } 258 259 /* search for objects that share the same slot */ 260 list_for_each_entry(slot, &bridge->slots, node) 261 if (slot->device == device) { 262 if (slot->sun != sun) 263 warn("sibling found, but _SUN doesn't match!\n"); 264 found = 1; 265 break; 266 } 267 268 if (!found) { 269 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 270 if (!slot) { 271 kfree(newfunc); 272 return AE_NO_MEMORY; 273 } 274 275 slot->bridge = bridge; 276 slot->device = device; 277 slot->sun = sun; 278 INIT_LIST_HEAD(&slot->funcs); 279 mutex_init(&slot->crit_sect); 280 281 mutex_lock(&bridge_mutex); 282 list_add_tail(&slot->node, &bridge->slots); 283 mutex_unlock(&bridge_mutex); 284 bridge->nr_slots++; 285 286 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 287 slot->sun, pci_domain_nr(pbus), pbus->number, device); 288 retval = acpiphp_register_hotplug_slot(slot); 289 if (retval) { 290 if (retval == -EBUSY) 291 warn("Slot %llu already registered by another " 292 "hotplug driver\n", slot->sun); 293 else 294 warn("acpiphp_register_hotplug_slot failed " 295 "(err code = 0x%x)\n", retval); 296 goto err_exit; 297 } 298 } 299 300 newfunc->slot = slot; 301 mutex_lock(&bridge_mutex); 302 list_add_tail(&newfunc->sibling, &slot->funcs); 303 mutex_unlock(&bridge_mutex); 304 305 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 306 &val, 60*1000)) 307 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 308 309 if (is_dock_device(handle)) { 310 /* we don't want to call this device's _EJ0 311 * because we want the dock notify handler 312 * to call it after it calls _DCK 313 */ 314 newfunc->flags &= ~FUNC_HAS_EJ0; 315 if (register_hotplug_dock_device(handle, 316 &acpiphp_dock_ops, newfunc, 317 acpiphp_dock_init, acpiphp_dock_release)) 318 dbg("failed to register dock device\n"); 319 320 /* we need to be notified when dock events happen 321 * outside of the hotplug operation, since we may 322 * need to do fixups before we can hotplug. 323 */ 324 newfunc->nb.notifier_call = post_dock_fixups; 325 if (register_dock_notifier(&newfunc->nb)) 326 dbg("failed to register a dock notifier"); 327 } 328 329 /* install notify handler */ 330 if (!(newfunc->flags & FUNC_HAS_DCK)) { 331 status = acpi_install_notify_handler(handle, 332 ACPI_SYSTEM_NOTIFY, 333 handle_hotplug_event_func, 334 newfunc); 335 336 if (ACPI_FAILURE(status)) 337 err("failed to register interrupt notify handler\n"); 338 } else 339 status = AE_OK; 340 341 return status; 342 343 err_exit: 344 bridge->nr_slots--; 345 mutex_lock(&bridge_mutex); 346 list_del(&slot->node); 347 mutex_unlock(&bridge_mutex); 348 kfree(slot); 349 kfree(newfunc); 350 351 return AE_OK; 352 } 353 354 355 /* see if it's worth looking at this bridge */ 356 static int detect_ejectable_slots(acpi_handle handle) 357 { 358 int found = acpi_pci_detect_ejectable(handle); 359 if (!found) { 360 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 361 is_pci_dock_device, NULL, (void *)&found, NULL); 362 } 363 return found; 364 } 365 366 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 367 static void init_bridge_misc(struct acpiphp_bridge *bridge) 368 { 369 acpi_status status; 370 371 /* must be added to the list prior to calling register_slot */ 372 mutex_lock(&bridge_mutex); 373 list_add(&bridge->list, &bridge_list); 374 mutex_unlock(&bridge_mutex); 375 376 /* register all slot objects under this bridge */ 377 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 378 register_slot, NULL, bridge, NULL); 379 if (ACPI_FAILURE(status)) { 380 mutex_lock(&bridge_mutex); 381 list_del(&bridge->list); 382 mutex_unlock(&bridge_mutex); 383 return; 384 } 385 386 /* install notify handler for P2P bridges */ 387 if (!pci_is_root_bus(bridge->pci_bus)) { 388 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 389 status = acpi_remove_notify_handler(bridge->func->handle, 390 ACPI_SYSTEM_NOTIFY, 391 handle_hotplug_event_func); 392 if (ACPI_FAILURE(status)) 393 err("failed to remove notify handler\n"); 394 } 395 status = acpi_install_notify_handler(bridge->handle, 396 ACPI_SYSTEM_NOTIFY, 397 handle_hotplug_event_bridge, 398 bridge); 399 400 if (ACPI_FAILURE(status)) { 401 err("failed to register interrupt notify handler\n"); 402 } 403 } 404 } 405 406 407 /* find acpiphp_func from acpiphp_bridge */ 408 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) 409 { 410 struct acpiphp_bridge *bridge; 411 struct acpiphp_slot *slot; 412 struct acpiphp_func *func = NULL; 413 414 mutex_lock(&bridge_mutex); 415 list_for_each_entry(bridge, &bridge_list, list) { 416 list_for_each_entry(slot, &bridge->slots, node) { 417 list_for_each_entry(func, &slot->funcs, sibling) { 418 if (func->handle == handle) { 419 get_bridge(func->slot->bridge); 420 mutex_unlock(&bridge_mutex); 421 return func; 422 } 423 } 424 } 425 } 426 mutex_unlock(&bridge_mutex); 427 428 return NULL; 429 } 430 431 432 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 433 { 434 struct acpiphp_bridge *bridge; 435 436 mutex_lock(&bridge_mutex); 437 list_for_each_entry(bridge, &bridge_list, list) 438 if (bridge->handle == handle) { 439 get_bridge(bridge); 440 mutex_unlock(&bridge_mutex); 441 return bridge; 442 } 443 mutex_unlock(&bridge_mutex); 444 445 return NULL; 446 } 447 448 static void cleanup_bridge(struct acpiphp_bridge *bridge) 449 { 450 struct acpiphp_slot *slot; 451 struct acpiphp_func *func; 452 acpi_status status; 453 acpi_handle handle = bridge->handle; 454 455 if (!pci_is_root_bus(bridge->pci_bus)) { 456 status = acpi_remove_notify_handler(handle, 457 ACPI_SYSTEM_NOTIFY, 458 handle_hotplug_event_bridge); 459 if (ACPI_FAILURE(status)) 460 err("failed to remove notify handler\n"); 461 } 462 463 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 464 status = acpi_install_notify_handler(bridge->func->handle, 465 ACPI_SYSTEM_NOTIFY, 466 handle_hotplug_event_func, 467 bridge->func); 468 if (ACPI_FAILURE(status)) 469 err("failed to install interrupt notify handler\n"); 470 } 471 472 list_for_each_entry(slot, &bridge->slots, node) { 473 list_for_each_entry(func, &slot->funcs, sibling) { 474 if (is_dock_device(func->handle)) { 475 unregister_hotplug_dock_device(func->handle); 476 unregister_dock_notifier(&func->nb); 477 } 478 if (!(func->flags & FUNC_HAS_DCK)) { 479 status = acpi_remove_notify_handler(func->handle, 480 ACPI_SYSTEM_NOTIFY, 481 handle_hotplug_event_func); 482 if (ACPI_FAILURE(status)) 483 err("failed to remove notify handler\n"); 484 } 485 } 486 acpiphp_unregister_hotplug_slot(slot); 487 } 488 489 mutex_lock(&bridge_mutex); 490 list_del(&bridge->list); 491 mutex_unlock(&bridge_mutex); 492 } 493 494 static int power_on_slot(struct acpiphp_slot *slot) 495 { 496 acpi_status status; 497 struct acpiphp_func *func; 498 int retval = 0; 499 500 /* if already enabled, just skip */ 501 if (slot->flags & SLOT_POWEREDON) 502 goto err_exit; 503 504 list_for_each_entry(func, &slot->funcs, sibling) { 505 if (func->flags & FUNC_HAS_PS0) { 506 dbg("%s: executing _PS0\n", __func__); 507 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 508 if (ACPI_FAILURE(status)) { 509 warn("%s: _PS0 failed\n", __func__); 510 retval = -1; 511 goto err_exit; 512 } else 513 break; 514 } 515 } 516 517 /* TBD: evaluate _STA to check if the slot is enabled */ 518 519 slot->flags |= SLOT_POWEREDON; 520 521 err_exit: 522 return retval; 523 } 524 525 526 static int power_off_slot(struct acpiphp_slot *slot) 527 { 528 acpi_status status; 529 struct acpiphp_func *func; 530 531 int retval = 0; 532 533 /* if already disabled, just skip */ 534 if ((slot->flags & SLOT_POWEREDON) == 0) 535 goto err_exit; 536 537 list_for_each_entry(func, &slot->funcs, sibling) { 538 if (func->flags & FUNC_HAS_PS3) { 539 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 540 if (ACPI_FAILURE(status)) { 541 warn("%s: _PS3 failed\n", __func__); 542 retval = -1; 543 goto err_exit; 544 } else 545 break; 546 } 547 } 548 549 /* TBD: evaluate _STA to check if the slot is disabled */ 550 551 slot->flags &= (~SLOT_POWEREDON); 552 553 err_exit: 554 return retval; 555 } 556 557 558 559 /** 560 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 561 * @bus: bus to start search with 562 */ 563 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 564 { 565 struct list_head *tmp; 566 unsigned char max, n; 567 568 /* 569 * pci_bus_max_busnr will return the highest 570 * reserved busnr for all these children. 571 * that is equivalent to the bus->subordinate 572 * value. We don't want to use the parent's 573 * bus->subordinate value because it could have 574 * padding in it. 575 */ 576 max = bus->busn_res.start; 577 578 list_for_each(tmp, &bus->children) { 579 n = pci_bus_max_busnr(pci_bus_b(tmp)); 580 if (n > max) 581 max = n; 582 } 583 return max; 584 } 585 586 587 /** 588 * acpiphp_bus_add - add a new bus to acpi subsystem 589 * @func: acpiphp_func of the bridge 590 */ 591 static int acpiphp_bus_add(struct acpiphp_func *func) 592 { 593 struct acpi_device *device; 594 int ret_val; 595 596 if (!acpi_bus_get_device(func->handle, &device)) { 597 dbg("bus exists... trim\n"); 598 /* this shouldn't be in here, so remove 599 * the bus then re-add it... 600 */ 601 acpi_bus_trim(device); 602 } 603 604 ret_val = acpi_bus_scan(func->handle); 605 if (!ret_val) 606 ret_val = acpi_bus_get_device(func->handle, &device); 607 608 if (ret_val) 609 dbg("error adding bus, %x\n", -ret_val); 610 611 return ret_val; 612 } 613 614 615 /** 616 * acpiphp_bus_trim - trim a bus from acpi subsystem 617 * @handle: handle to acpi namespace 618 */ 619 static int acpiphp_bus_trim(acpi_handle handle) 620 { 621 struct acpi_device *device; 622 int retval; 623 624 retval = acpi_bus_get_device(handle, &device); 625 if (retval) { 626 dbg("acpi_device not found\n"); 627 return retval; 628 } 629 630 acpi_bus_trim(device); 631 return 0; 632 } 633 634 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 635 { 636 struct acpiphp_func *func; 637 union acpi_object params[2]; 638 struct acpi_object_list arg_list; 639 640 list_for_each_entry(func, &slot->funcs, sibling) { 641 arg_list.count = 2; 642 arg_list.pointer = params; 643 params[0].type = ACPI_TYPE_INTEGER; 644 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 645 params[1].type = ACPI_TYPE_INTEGER; 646 params[1].integer.value = 1; 647 /* _REG is optional, we don't care about if there is failure */ 648 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL); 649 } 650 } 651 652 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 653 { 654 struct acpiphp_func *func; 655 656 if (!dev->subordinate) 657 return; 658 659 /* quirk, or pcie could set it already */ 660 if (dev->is_hotplug_bridge) 661 return; 662 663 if (PCI_SLOT(dev->devfn) != slot->device) 664 return; 665 666 list_for_each_entry(func, &slot->funcs, sibling) { 667 if (PCI_FUNC(dev->devfn) == func->function) { 668 /* check if this bridge has ejectable slots */ 669 if ((detect_ejectable_slots(func->handle) > 0)) 670 dev->is_hotplug_bridge = 1; 671 break; 672 } 673 } 674 } 675 676 /** 677 * enable_device - enable, configure a slot 678 * @slot: slot to be enabled 679 * 680 * This function should be called per *physical slot*, 681 * not per each slot object in ACPI namespace. 682 */ 683 static int __ref enable_device(struct acpiphp_slot *slot) 684 { 685 struct pci_dev *dev; 686 struct pci_bus *bus = slot->bridge->pci_bus; 687 struct acpiphp_func *func; 688 int num, max, pass; 689 LIST_HEAD(add_list); 690 691 if (slot->flags & SLOT_ENABLED) 692 goto err_exit; 693 694 list_for_each_entry(func, &slot->funcs, sibling) 695 acpiphp_bus_add(func); 696 697 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 698 if (num == 0) { 699 /* Maybe only part of funcs are added. */ 700 dbg("No new device found\n"); 701 goto err_exit; 702 } 703 704 max = acpiphp_max_busnr(bus); 705 for (pass = 0; pass < 2; pass++) { 706 list_for_each_entry(dev, &bus->devices, bus_list) { 707 if (PCI_SLOT(dev->devfn) != slot->device) 708 continue; 709 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 710 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 711 max = pci_scan_bridge(bus, dev, max, pass); 712 if (pass && dev->subordinate) { 713 check_hotplug_bridge(slot, dev); 714 pcibios_resource_survey_bus(dev->subordinate); 715 __pci_bus_size_bridges(dev->subordinate, 716 &add_list); 717 } 718 } 719 } 720 } 721 722 __pci_bus_assign_resources(bus, &add_list, NULL); 723 acpiphp_sanitize_bus(bus); 724 acpiphp_set_hpp_values(bus); 725 acpiphp_set_acpi_region(slot); 726 727 list_for_each_entry(dev, &bus->devices, bus_list) { 728 /* Assume that newly added devices are powered on already. */ 729 if (!dev->is_added) 730 dev->current_state = PCI_D0; 731 } 732 733 pci_bus_add_devices(bus); 734 735 slot->flags |= SLOT_ENABLED; 736 list_for_each_entry(func, &slot->funcs, sibling) { 737 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 738 func->function)); 739 if (!dev) { 740 /* Do not set SLOT_ENABLED flag if some funcs 741 are not added. */ 742 slot->flags &= (~SLOT_ENABLED); 743 continue; 744 } 745 } 746 747 748 err_exit: 749 return 0; 750 } 751 752 /* return first device in slot, acquiring a reference on it */ 753 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 754 { 755 struct pci_bus *bus = slot->bridge->pci_bus; 756 struct pci_dev *dev; 757 struct pci_dev *ret = NULL; 758 759 down_read(&pci_bus_sem); 760 list_for_each_entry(dev, &bus->devices, bus_list) 761 if (PCI_SLOT(dev->devfn) == slot->device) { 762 ret = pci_dev_get(dev); 763 break; 764 } 765 up_read(&pci_bus_sem); 766 767 return ret; 768 } 769 770 /** 771 * disable_device - disable a slot 772 * @slot: ACPI PHP slot 773 */ 774 static int disable_device(struct acpiphp_slot *slot) 775 { 776 struct acpiphp_func *func; 777 struct pci_dev *pdev; 778 779 /* 780 * enable_device() enumerates all functions in this device via 781 * pci_scan_slot(), whether they have associated ACPI hotplug 782 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 783 * here. 784 */ 785 while ((pdev = dev_in_slot(slot))) { 786 pci_stop_and_remove_bus_device(pdev); 787 pci_dev_put(pdev); 788 } 789 790 list_for_each_entry(func, &slot->funcs, sibling) { 791 acpiphp_bus_trim(func->handle); 792 } 793 794 slot->flags &= (~SLOT_ENABLED); 795 796 return 0; 797 } 798 799 800 /** 801 * get_slot_status - get ACPI slot status 802 * @slot: ACPI PHP slot 803 * 804 * If a slot has _STA for each function and if any one of them 805 * returned non-zero status, return it. 806 * 807 * If a slot doesn't have _STA and if any one of its functions' 808 * configuration space is configured, return 0x0f as a _STA. 809 * 810 * Otherwise return 0. 811 */ 812 static unsigned int get_slot_status(struct acpiphp_slot *slot) 813 { 814 acpi_status status; 815 unsigned long long sta = 0; 816 u32 dvid; 817 struct acpiphp_func *func; 818 819 list_for_each_entry(func, &slot->funcs, sibling) { 820 if (func->flags & FUNC_HAS_STA) { 821 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 822 if (ACPI_SUCCESS(status) && sta) 823 break; 824 } else { 825 pci_bus_read_config_dword(slot->bridge->pci_bus, 826 PCI_DEVFN(slot->device, 827 func->function), 828 PCI_VENDOR_ID, &dvid); 829 if (dvid != 0xffffffff) { 830 sta = ACPI_STA_ALL; 831 break; 832 } 833 } 834 } 835 836 return (unsigned int)sta; 837 } 838 839 /** 840 * acpiphp_eject_slot - physically eject the slot 841 * @slot: ACPI PHP slot 842 */ 843 int acpiphp_eject_slot(struct acpiphp_slot *slot) 844 { 845 acpi_status status; 846 struct acpiphp_func *func; 847 struct acpi_object_list arg_list; 848 union acpi_object arg; 849 850 list_for_each_entry(func, &slot->funcs, sibling) { 851 /* We don't want to call _EJ0 on non-existing functions. */ 852 if ((func->flags & FUNC_HAS_EJ0)) { 853 /* _EJ0 method take one argument */ 854 arg_list.count = 1; 855 arg_list.pointer = &arg; 856 arg.type = ACPI_TYPE_INTEGER; 857 arg.integer.value = 1; 858 859 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 860 if (ACPI_FAILURE(status)) { 861 warn("%s: _EJ0 failed\n", __func__); 862 return -1; 863 } else 864 break; 865 } 866 } 867 return 0; 868 } 869 870 /** 871 * acpiphp_check_bridge - re-enumerate devices 872 * @bridge: where to begin re-enumeration 873 * 874 * Iterate over all slots under this bridge and make sure that if a 875 * card is present they are enabled, and if not they are disabled. 876 */ 877 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 878 { 879 struct acpiphp_slot *slot; 880 int retval = 0; 881 int enabled, disabled; 882 883 enabled = disabled = 0; 884 885 list_for_each_entry(slot, &bridge->slots, node) { 886 unsigned int status = get_slot_status(slot); 887 if (slot->flags & SLOT_ENABLED) { 888 if (status == ACPI_STA_ALL) 889 continue; 890 retval = acpiphp_disable_slot(slot); 891 if (retval) { 892 err("Error occurred in disabling\n"); 893 goto err_exit; 894 } else { 895 acpiphp_eject_slot(slot); 896 } 897 disabled++; 898 } else { 899 if (status != ACPI_STA_ALL) 900 continue; 901 retval = acpiphp_enable_slot(slot); 902 if (retval) { 903 err("Error occurred in enabling\n"); 904 goto err_exit; 905 } 906 enabled++; 907 } 908 } 909 910 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 911 912 err_exit: 913 return retval; 914 } 915 916 static void acpiphp_set_hpp_values(struct pci_bus *bus) 917 { 918 struct pci_dev *dev; 919 920 list_for_each_entry(dev, &bus->devices, bus_list) 921 pci_configure_slot(dev); 922 } 923 924 /* 925 * Remove devices for which we could not assign resources, call 926 * arch specific code to fix-up the bus 927 */ 928 static void acpiphp_sanitize_bus(struct pci_bus *bus) 929 { 930 struct pci_dev *dev, *tmp; 931 int i; 932 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 933 934 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 935 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 936 struct resource *res = &dev->resource[i]; 937 if ((res->flags & type_mask) && !res->start && 938 res->end) { 939 /* Could not assign a required resources 940 * for this device, remove it */ 941 pci_stop_and_remove_bus_device(dev); 942 break; 943 } 944 } 945 } 946 } 947 948 /* 949 * ACPI event handlers 950 */ 951 952 static acpi_status 953 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 954 { 955 struct acpiphp_bridge *bridge; 956 char objname[64]; 957 struct acpi_buffer buffer = { .length = sizeof(objname), 958 .pointer = objname }; 959 960 bridge = acpiphp_handle_to_bridge(handle); 961 if (bridge) { 962 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 963 dbg("%s: re-enumerating slots under %s\n", 964 __func__, objname); 965 acpiphp_check_bridge(bridge); 966 put_bridge(bridge); 967 } 968 return AE_OK ; 969 } 970 971 void acpiphp_check_host_bridge(acpi_handle handle) 972 { 973 struct acpiphp_bridge *bridge; 974 975 bridge = acpiphp_handle_to_bridge(handle); 976 if (bridge) { 977 acpiphp_check_bridge(bridge); 978 put_bridge(bridge); 979 } 980 981 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 982 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 983 } 984 985 static void _handle_hotplug_event_bridge(struct work_struct *work) 986 { 987 struct acpiphp_bridge *bridge; 988 char objname[64]; 989 struct acpi_buffer buffer = { .length = sizeof(objname), 990 .pointer = objname }; 991 struct acpi_hp_work *hp_work; 992 acpi_handle handle; 993 u32 type; 994 995 hp_work = container_of(work, struct acpi_hp_work, work); 996 handle = hp_work->handle; 997 type = hp_work->type; 998 bridge = (struct acpiphp_bridge *)hp_work->context; 999 1000 acpi_scan_lock_acquire(); 1001 1002 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1003 1004 switch (type) { 1005 case ACPI_NOTIFY_BUS_CHECK: 1006 /* bus re-enumerate */ 1007 dbg("%s: Bus check notify on %s\n", __func__, objname); 1008 dbg("%s: re-enumerating slots under %s\n", __func__, objname); 1009 acpiphp_check_bridge(bridge); 1010 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1011 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1012 break; 1013 1014 case ACPI_NOTIFY_DEVICE_CHECK: 1015 /* device check */ 1016 dbg("%s: Device check notify on %s\n", __func__, objname); 1017 acpiphp_check_bridge(bridge); 1018 break; 1019 1020 case ACPI_NOTIFY_DEVICE_WAKE: 1021 /* wake event */ 1022 dbg("%s: Device wake notify on %s\n", __func__, objname); 1023 break; 1024 1025 case ACPI_NOTIFY_EJECT_REQUEST: 1026 /* request device eject */ 1027 dbg("%s: Device eject notify on %s\n", __func__, objname); 1028 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 1029 struct acpiphp_slot *slot; 1030 slot = bridge->func->slot; 1031 if (!acpiphp_disable_slot(slot)) 1032 acpiphp_eject_slot(slot); 1033 } 1034 break; 1035 1036 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1037 printk(KERN_ERR "Device %s cannot be configured due" 1038 " to a frequency mismatch\n", objname); 1039 break; 1040 1041 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1042 printk(KERN_ERR "Device %s cannot be configured due" 1043 " to a bus mode mismatch\n", objname); 1044 break; 1045 1046 case ACPI_NOTIFY_POWER_FAULT: 1047 printk(KERN_ERR "Device %s has suffered a power fault\n", 1048 objname); 1049 break; 1050 1051 default: 1052 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1053 break; 1054 } 1055 1056 acpi_scan_lock_release(); 1057 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1058 put_bridge(bridge); 1059 } 1060 1061 /** 1062 * handle_hotplug_event_bridge - handle ACPI event on bridges 1063 * @handle: Notify()'ed acpi_handle 1064 * @type: Notify code 1065 * @context: pointer to acpiphp_bridge structure 1066 * 1067 * Handles ACPI event notification on {host,p2p} bridges. 1068 */ 1069 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, 1070 void *context) 1071 { 1072 struct acpiphp_bridge *bridge = context; 1073 1074 /* 1075 * Currently the code adds all hotplug events to the kacpid_wq 1076 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1077 * The proper way to fix this is to reorganize the code so that 1078 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1079 * For now just re-add this work to the kacpi_hotplug_wq so we 1080 * don't deadlock on hotplug actions. 1081 */ 1082 get_bridge(bridge); 1083 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge); 1084 } 1085 1086 static void hotplug_event_func(acpi_handle handle, u32 type, void *context) 1087 { 1088 struct acpiphp_func *func = context; 1089 char objname[64]; 1090 struct acpi_buffer buffer = { .length = sizeof(objname), 1091 .pointer = objname }; 1092 1093 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1094 1095 switch (type) { 1096 case ACPI_NOTIFY_BUS_CHECK: 1097 /* bus re-enumerate */ 1098 dbg("%s: Bus check notify on %s\n", __func__, objname); 1099 acpiphp_enable_slot(func->slot); 1100 break; 1101 1102 case ACPI_NOTIFY_DEVICE_CHECK: 1103 /* device check : re-enumerate from parent bus */ 1104 dbg("%s: Device check notify on %s\n", __func__, objname); 1105 acpiphp_check_bridge(func->slot->bridge); 1106 break; 1107 1108 case ACPI_NOTIFY_DEVICE_WAKE: 1109 /* wake event */ 1110 dbg("%s: Device wake notify on %s\n", __func__, objname); 1111 break; 1112 1113 case ACPI_NOTIFY_EJECT_REQUEST: 1114 /* request device eject */ 1115 dbg("%s: Device eject notify on %s\n", __func__, objname); 1116 if (!(acpiphp_disable_slot(func->slot))) 1117 acpiphp_eject_slot(func->slot); 1118 break; 1119 1120 default: 1121 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1122 break; 1123 } 1124 } 1125 1126 static void _handle_hotplug_event_func(struct work_struct *work) 1127 { 1128 struct acpi_hp_work *hp_work; 1129 struct acpiphp_func *func; 1130 1131 hp_work = container_of(work, struct acpi_hp_work, work); 1132 func = hp_work->context; 1133 acpi_scan_lock_acquire(); 1134 1135 hotplug_event_func(hp_work->handle, hp_work->type, func); 1136 1137 acpi_scan_lock_release(); 1138 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1139 put_bridge(func->slot->bridge); 1140 } 1141 1142 /** 1143 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1144 * @handle: Notify()'ed acpi_handle 1145 * @type: Notify code 1146 * @context: pointer to acpiphp_func structure 1147 * 1148 * Handles ACPI event notification on slots. 1149 */ 1150 static void handle_hotplug_event_func(acpi_handle handle, u32 type, 1151 void *context) 1152 { 1153 struct acpiphp_func *func = context; 1154 1155 /* 1156 * Currently the code adds all hotplug events to the kacpid_wq 1157 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1158 * The proper way to fix this is to reorganize the code so that 1159 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1160 * For now just re-add this work to the kacpi_hotplug_wq so we 1161 * don't deadlock on hotplug actions. 1162 */ 1163 get_bridge(func->slot->bridge); 1164 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func); 1165 } 1166 1167 /* 1168 * Create hotplug slots for the PCI bus. 1169 * It should always return 0 to avoid skipping following notifiers. 1170 */ 1171 void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle) 1172 { 1173 acpi_handle dummy_handle; 1174 struct acpiphp_bridge *bridge; 1175 1176 if (acpiphp_disabled) 1177 return; 1178 1179 if (detect_ejectable_slots(handle) <= 0) 1180 return; 1181 1182 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 1183 if (bridge == NULL) { 1184 err("out of memory\n"); 1185 return; 1186 } 1187 1188 INIT_LIST_HEAD(&bridge->slots); 1189 kref_init(&bridge->ref); 1190 bridge->handle = handle; 1191 bridge->pci_dev = pci_dev_get(bus->self); 1192 bridge->pci_bus = bus; 1193 1194 /* 1195 * Grab a ref to the subordinate PCI bus in case the bus is 1196 * removed via PCI core logical hotplug. The ref pins the bus 1197 * (which we access during module unload). 1198 */ 1199 get_device(&bus->dev); 1200 1201 if (!pci_is_root_bus(bridge->pci_bus) && 1202 ACPI_SUCCESS(acpi_get_handle(bridge->handle, 1203 "_EJ0", &dummy_handle))) { 1204 dbg("found ejectable p2p bridge\n"); 1205 bridge->flags |= BRIDGE_HAS_EJ0; 1206 bridge->func = acpiphp_bridge_handle_to_function(handle); 1207 } 1208 1209 init_bridge_misc(bridge); 1210 } 1211 1212 /* Destroy hotplug slots associated with the PCI bus */ 1213 void acpiphp_remove_slots(struct pci_bus *bus) 1214 { 1215 struct acpiphp_bridge *bridge, *tmp; 1216 1217 if (acpiphp_disabled) 1218 return; 1219 1220 list_for_each_entry_safe(bridge, tmp, &bridge_list, list) 1221 if (bridge->pci_bus == bus) { 1222 cleanup_bridge(bridge); 1223 put_bridge(bridge); 1224 break; 1225 } 1226 } 1227 1228 /** 1229 * acpiphp_enable_slot - power on slot 1230 * @slot: ACPI PHP slot 1231 */ 1232 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1233 { 1234 int retval; 1235 1236 mutex_lock(&slot->crit_sect); 1237 1238 /* wake up all functions */ 1239 retval = power_on_slot(slot); 1240 if (retval) 1241 goto err_exit; 1242 1243 if (get_slot_status(slot) == ACPI_STA_ALL) { 1244 /* configure all functions */ 1245 retval = enable_device(slot); 1246 if (retval) 1247 power_off_slot(slot); 1248 } else { 1249 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1250 power_off_slot(slot); 1251 } 1252 1253 err_exit: 1254 mutex_unlock(&slot->crit_sect); 1255 return retval; 1256 } 1257 1258 /** 1259 * acpiphp_disable_slot - power off slot 1260 * @slot: ACPI PHP slot 1261 */ 1262 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1263 { 1264 int retval = 0; 1265 1266 mutex_lock(&slot->crit_sect); 1267 1268 /* unconfigure all functions */ 1269 retval = disable_device(slot); 1270 if (retval) 1271 goto err_exit; 1272 1273 /* power off all functions */ 1274 retval = power_off_slot(slot); 1275 if (retval) 1276 goto err_exit; 1277 1278 err_exit: 1279 mutex_unlock(&slot->crit_sect); 1280 return retval; 1281 } 1282 1283 1284 /* 1285 * slot enabled: 1 1286 * slot disabled: 0 1287 */ 1288 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1289 { 1290 return (slot->flags & SLOT_POWEREDON); 1291 } 1292 1293 1294 /* 1295 * latch open: 1 1296 * latch closed: 0 1297 */ 1298 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1299 { 1300 unsigned int sta; 1301 1302 sta = get_slot_status(slot); 1303 1304 return (sta & ACPI_STA_DEVICE_UI) ? 0 : 1; 1305 } 1306 1307 1308 /* 1309 * adapter presence : 1 1310 * absence : 0 1311 */ 1312 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1313 { 1314 unsigned int sta; 1315 1316 sta = get_slot_status(slot); 1317 1318 return (sta == 0) ? 0 : 1; 1319 } 1320