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 static DEFINE_MUTEX(acpiphp_context_lock); 59 60 #define MY_NAME "acpiphp_glue" 61 62 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); 63 static void acpiphp_sanitize_bus(struct pci_bus *bus); 64 static void acpiphp_set_hpp_values(struct pci_bus *bus); 65 static void 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 void acpiphp_context_handler(acpi_handle handle, void *context) 83 { 84 /* Intentionally empty. */ 85 } 86 87 /** 88 * acpiphp_init_context - Create hotplug context and grab a reference to it. 89 * @handle: ACPI object handle to create the context for. 90 * 91 * Call under acpiphp_context_lock. 92 */ 93 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle) 94 { 95 struct acpiphp_context *context; 96 acpi_status status; 97 98 context = kzalloc(sizeof(*context), GFP_KERNEL); 99 if (!context) 100 return NULL; 101 102 context->handle = handle; 103 context->refcount = 1; 104 status = acpi_attach_data(handle, acpiphp_context_handler, context); 105 if (ACPI_FAILURE(status)) { 106 kfree(context); 107 return NULL; 108 } 109 return context; 110 } 111 112 /** 113 * acpiphp_get_context - Get hotplug context and grab a reference to it. 114 * @handle: ACPI object handle to get the context for. 115 * 116 * Call under acpiphp_context_lock. 117 */ 118 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle) 119 { 120 struct acpiphp_context *context = NULL; 121 acpi_status status; 122 void *data; 123 124 status = acpi_get_data(handle, acpiphp_context_handler, &data); 125 if (ACPI_SUCCESS(status)) { 126 context = data; 127 context->refcount++; 128 } 129 return context; 130 } 131 132 /** 133 * acpiphp_put_context - Drop a reference to ACPI hotplug context. 134 * @handle: ACPI object handle to put the context for. 135 * 136 * The context object is removed if there are no more references to it. 137 * 138 * Call under acpiphp_context_lock. 139 */ 140 static void acpiphp_put_context(struct acpiphp_context *context) 141 { 142 if (--context->refcount) 143 return; 144 145 WARN_ON(context->func || context->bridge); 146 acpi_detach_data(context->handle, acpiphp_context_handler); 147 kfree(context); 148 } 149 150 static inline void get_bridge(struct acpiphp_bridge *bridge) 151 { 152 kref_get(&bridge->ref); 153 } 154 155 static inline void put_bridge(struct acpiphp_bridge *bridge) 156 { 157 kref_put(&bridge->ref, free_bridge); 158 } 159 160 static void free_bridge(struct kref *kref) 161 { 162 struct acpiphp_context *context; 163 struct acpiphp_bridge *bridge; 164 struct acpiphp_slot *slot, *next; 165 struct acpiphp_func *func, *tmp; 166 167 mutex_lock(&acpiphp_context_lock); 168 169 bridge = container_of(kref, struct acpiphp_bridge, ref); 170 171 list_for_each_entry_safe(slot, next, &bridge->slots, node) { 172 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) { 173 context = func->context; 174 context->func = NULL; 175 acpiphp_put_context(context); 176 kfree(func); 177 } 178 kfree(slot); 179 } 180 181 context = bridge->context; 182 /* Release the reference acquired by acpiphp_enumerate_slots(). */ 183 if (context->handler_for_func) 184 put_bridge(bridge->func->slot->bridge); 185 186 put_device(&bridge->pci_bus->dev); 187 pci_dev_put(bridge->pci_dev); 188 context->bridge = NULL; 189 acpiphp_put_context(context); 190 kfree(bridge); 191 192 mutex_unlock(&acpiphp_context_lock); 193 } 194 195 /* 196 * the _DCK method can do funny things... and sometimes not 197 * hah-hah funny. 198 * 199 * TBD - figure out a way to only call fixups for 200 * systems that require them. 201 */ 202 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) 203 { 204 struct acpiphp_func *func = data; 205 struct pci_bus *bus = func->slot->bridge->pci_bus; 206 u32 buses; 207 208 if (!bus->self) 209 return; 210 211 /* fixup bad _DCK function that rewrites 212 * secondary bridge on slot 213 */ 214 pci_read_config_dword(bus->self, 215 PCI_PRIMARY_BUS, 216 &buses); 217 218 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 219 buses = (buses & 0xff000000) 220 | ((unsigned int)(bus->primary) << 0) 221 | ((unsigned int)(bus->busn_res.start) << 8) 222 | ((unsigned int)(bus->busn_res.end) << 16); 223 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 224 } 225 } 226 227 228 static const struct acpi_dock_ops acpiphp_dock_ops = { 229 .fixup = post_dock_fixups, 230 .handler = hotplug_event_func, 231 }; 232 233 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 234 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 235 { 236 u32 reg32; 237 acpi_handle tmp; 238 struct acpi_pci_root *root; 239 240 /* Check whether the PCIe port supports native PCIe hotplug */ 241 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 242 return false; 243 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 244 return false; 245 246 /* 247 * Check whether native PCIe hotplug has been enabled for 248 * this PCIe hierarchy. 249 */ 250 tmp = acpi_find_root_bridge_handle(pdev); 251 if (!tmp) 252 return false; 253 root = acpi_pci_find_root(tmp); 254 if (!root) 255 return false; 256 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 257 return false; 258 259 return true; 260 } 261 262 static void acpiphp_dock_init(void *data) 263 { 264 struct acpiphp_func *func = data; 265 266 get_bridge(func->slot->bridge); 267 } 268 269 static void acpiphp_dock_release(void *data) 270 { 271 struct acpiphp_func *func = data; 272 273 put_bridge(func->slot->bridge); 274 } 275 276 /* callback routine to register each ACPI PCI slot object */ 277 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, 278 void **rv) 279 { 280 struct acpiphp_bridge *bridge = data; 281 struct acpiphp_context *context; 282 struct acpiphp_slot *slot; 283 struct acpiphp_func *newfunc; 284 acpi_status status = AE_OK; 285 unsigned long long adr, sun; 286 int device, function, retval, found = 0; 287 struct pci_bus *pbus = bridge->pci_bus; 288 struct pci_dev *pdev; 289 u32 val; 290 291 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) 292 return AE_OK; 293 294 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 295 if (ACPI_FAILURE(status)) { 296 warn("can't evaluate _ADR (%#x)\n", status); 297 return AE_OK; 298 } 299 300 device = (adr >> 16) & 0xffff; 301 function = adr & 0xffff; 302 303 pdev = bridge->pci_dev; 304 if (pdev && device_is_managed_by_native_pciehp(pdev)) 305 return AE_OK; 306 307 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 308 if (!newfunc) 309 return AE_NO_MEMORY; 310 311 newfunc->handle = handle; 312 newfunc->function = function; 313 314 mutex_lock(&acpiphp_context_lock); 315 context = acpiphp_init_context(handle); 316 if (!context) { 317 mutex_unlock(&acpiphp_context_lock); 318 acpi_handle_err(handle, "No hotplug context\n"); 319 kfree(newfunc); 320 return AE_NOT_EXIST; 321 } 322 newfunc->context = context; 323 context->func = newfunc; 324 mutex_unlock(&acpiphp_context_lock); 325 326 if (acpi_has_method(handle, "_EJ0")) 327 newfunc->flags = FUNC_HAS_EJ0; 328 329 if (acpi_has_method(handle, "_STA")) 330 newfunc->flags |= FUNC_HAS_STA; 331 332 if (acpi_has_method(handle, "_PS0")) 333 newfunc->flags |= FUNC_HAS_PS0; 334 335 if (acpi_has_method(handle, "_PS3")) 336 newfunc->flags |= FUNC_HAS_PS3; 337 338 if (acpi_has_method(handle, "_DCK")) 339 newfunc->flags |= FUNC_HAS_DCK; 340 341 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 342 if (ACPI_FAILURE(status)) { 343 /* 344 * use the count of the number of slots we've found 345 * for the number of the slot 346 */ 347 sun = bridge->nr_slots+1; 348 } 349 350 /* search for objects that share the same slot */ 351 list_for_each_entry(slot, &bridge->slots, node) 352 if (slot->device == device) { 353 if (slot->sun != sun) 354 warn("sibling found, but _SUN doesn't match!\n"); 355 found = 1; 356 break; 357 } 358 359 if (!found) { 360 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 361 if (!slot) { 362 status = AE_NO_MEMORY; 363 goto err_out; 364 } 365 366 slot->bridge = bridge; 367 slot->device = device; 368 slot->sun = sun; 369 INIT_LIST_HEAD(&slot->funcs); 370 mutex_init(&slot->crit_sect); 371 372 mutex_lock(&bridge_mutex); 373 list_add_tail(&slot->node, &bridge->slots); 374 mutex_unlock(&bridge_mutex); 375 bridge->nr_slots++; 376 377 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 378 slot->sun, pci_domain_nr(pbus), pbus->number, device); 379 retval = acpiphp_register_hotplug_slot(slot); 380 if (retval) { 381 if (retval == -EBUSY) 382 warn("Slot %llu already registered by another " 383 "hotplug driver\n", slot->sun); 384 else 385 warn("acpiphp_register_hotplug_slot failed " 386 "(err code = 0x%x)\n", retval); 387 388 status = AE_OK; 389 goto err; 390 } 391 } 392 393 newfunc->slot = slot; 394 mutex_lock(&bridge_mutex); 395 list_add_tail(&newfunc->sibling, &slot->funcs); 396 mutex_unlock(&bridge_mutex); 397 398 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 399 &val, 60*1000)) 400 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 401 402 if (is_dock_device(handle)) { 403 /* we don't want to call this device's _EJ0 404 * because we want the dock notify handler 405 * to call it after it calls _DCK 406 */ 407 newfunc->flags &= ~FUNC_HAS_EJ0; 408 if (register_hotplug_dock_device(handle, 409 &acpiphp_dock_ops, newfunc, 410 acpiphp_dock_init, acpiphp_dock_release)) 411 dbg("failed to register dock device\n"); 412 } 413 414 /* install notify handler */ 415 if (!(newfunc->flags & FUNC_HAS_DCK)) { 416 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 417 handle_hotplug_event, 418 context); 419 if (ACPI_SUCCESS(status)) 420 context->handler_for_func = true; 421 else 422 err("failed to register interrupt notify handler\n"); 423 } 424 425 return AE_OK; 426 427 err: 428 bridge->nr_slots--; 429 mutex_lock(&bridge_mutex); 430 list_del(&slot->node); 431 mutex_unlock(&bridge_mutex); 432 kfree(slot); 433 434 err_out: 435 mutex_lock(&acpiphp_context_lock); 436 context->func = NULL; 437 acpiphp_put_context(context); 438 mutex_unlock(&acpiphp_context_lock); 439 kfree(newfunc); 440 return status; 441 } 442 443 444 /* see if it's worth looking at this bridge */ 445 static int detect_ejectable_slots(acpi_handle handle) 446 { 447 int found = acpi_pci_detect_ejectable(handle); 448 if (!found) { 449 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 450 is_pci_dock_device, NULL, (void *)&found, NULL); 451 } 452 return found; 453 } 454 455 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 456 { 457 struct acpiphp_bridge *bridge; 458 459 mutex_lock(&bridge_mutex); 460 list_for_each_entry(bridge, &bridge_list, list) 461 if (bridge->handle == handle) { 462 get_bridge(bridge); 463 mutex_unlock(&bridge_mutex); 464 return bridge; 465 } 466 mutex_unlock(&bridge_mutex); 467 468 return NULL; 469 } 470 471 static void cleanup_bridge(struct acpiphp_bridge *bridge) 472 { 473 struct acpiphp_slot *slot; 474 struct acpiphp_func *func; 475 acpi_status status; 476 acpi_handle handle = bridge->handle; 477 478 if (!bridge->context->handler_for_func) { 479 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 480 handle_hotplug_event); 481 if (ACPI_FAILURE(status)) 482 err("failed to remove notify handler\n"); 483 } 484 485 list_for_each_entry(slot, &bridge->slots, node) { 486 list_for_each_entry(func, &slot->funcs, sibling) { 487 if (is_dock_device(func->handle)) { 488 unregister_hotplug_dock_device(func->handle); 489 } 490 if (!(func->flags & FUNC_HAS_DCK)) { 491 func->context->handler_for_func = false; 492 status = acpi_remove_notify_handler(func->handle, 493 ACPI_SYSTEM_NOTIFY, 494 handle_hotplug_event); 495 if (ACPI_FAILURE(status)) 496 err("failed to remove notify handler\n"); 497 } 498 } 499 acpiphp_unregister_hotplug_slot(slot); 500 } 501 502 mutex_lock(&bridge_mutex); 503 list_del(&bridge->list); 504 mutex_unlock(&bridge_mutex); 505 } 506 507 static int power_on_slot(struct acpiphp_slot *slot) 508 { 509 acpi_status status; 510 struct acpiphp_func *func; 511 int retval = 0; 512 513 /* if already enabled, just skip */ 514 if (slot->flags & SLOT_POWEREDON) 515 goto err_exit; 516 517 list_for_each_entry(func, &slot->funcs, sibling) { 518 if (func->flags & FUNC_HAS_PS0) { 519 dbg("%s: executing _PS0\n", __func__); 520 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 521 if (ACPI_FAILURE(status)) { 522 warn("%s: _PS0 failed\n", __func__); 523 retval = -1; 524 goto err_exit; 525 } else 526 break; 527 } 528 } 529 530 /* TBD: evaluate _STA to check if the slot is enabled */ 531 532 slot->flags |= SLOT_POWEREDON; 533 534 err_exit: 535 return retval; 536 } 537 538 539 static int power_off_slot(struct acpiphp_slot *slot) 540 { 541 acpi_status status; 542 struct acpiphp_func *func; 543 544 int retval = 0; 545 546 /* if already disabled, just skip */ 547 if ((slot->flags & SLOT_POWEREDON) == 0) 548 goto err_exit; 549 550 list_for_each_entry(func, &slot->funcs, sibling) { 551 if (func->flags & FUNC_HAS_PS3) { 552 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 553 if (ACPI_FAILURE(status)) { 554 warn("%s: _PS3 failed\n", __func__); 555 retval = -1; 556 goto err_exit; 557 } else 558 break; 559 } 560 } 561 562 /* TBD: evaluate _STA to check if the slot is disabled */ 563 564 slot->flags &= (~SLOT_POWEREDON); 565 566 err_exit: 567 return retval; 568 } 569 570 571 572 /** 573 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 574 * @bus: bus to start search with 575 */ 576 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 577 { 578 struct list_head *tmp; 579 unsigned char max, n; 580 581 /* 582 * pci_bus_max_busnr will return the highest 583 * reserved busnr for all these children. 584 * that is equivalent to the bus->subordinate 585 * value. We don't want to use the parent's 586 * bus->subordinate value because it could have 587 * padding in it. 588 */ 589 max = bus->busn_res.start; 590 591 list_for_each(tmp, &bus->children) { 592 n = pci_bus_max_busnr(pci_bus_b(tmp)); 593 if (n > max) 594 max = n; 595 } 596 return max; 597 } 598 599 600 /** 601 * acpiphp_bus_add - add a new bus to acpi subsystem 602 * @func: acpiphp_func of the bridge 603 */ 604 static int acpiphp_bus_add(struct acpiphp_func *func) 605 { 606 struct acpi_device *device; 607 int ret_val; 608 609 if (!acpi_bus_get_device(func->handle, &device)) { 610 dbg("bus exists... trim\n"); 611 /* this shouldn't be in here, so remove 612 * the bus then re-add it... 613 */ 614 acpi_bus_trim(device); 615 } 616 617 ret_val = acpi_bus_scan(func->handle); 618 if (!ret_val) 619 ret_val = acpi_bus_get_device(func->handle, &device); 620 621 if (ret_val) 622 dbg("error adding bus, %x\n", -ret_val); 623 624 return ret_val; 625 } 626 627 628 /** 629 * acpiphp_bus_trim - trim a bus from acpi subsystem 630 * @handle: handle to acpi namespace 631 */ 632 static int acpiphp_bus_trim(acpi_handle handle) 633 { 634 struct acpi_device *device; 635 int retval; 636 637 retval = acpi_bus_get_device(handle, &device); 638 if (retval) { 639 dbg("acpi_device not found\n"); 640 return retval; 641 } 642 643 acpi_bus_trim(device); 644 return 0; 645 } 646 647 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 648 { 649 struct acpiphp_func *func; 650 union acpi_object params[2]; 651 struct acpi_object_list arg_list; 652 653 list_for_each_entry(func, &slot->funcs, sibling) { 654 arg_list.count = 2; 655 arg_list.pointer = params; 656 params[0].type = ACPI_TYPE_INTEGER; 657 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 658 params[1].type = ACPI_TYPE_INTEGER; 659 params[1].integer.value = 1; 660 /* _REG is optional, we don't care about if there is failure */ 661 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL); 662 } 663 } 664 665 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 666 { 667 struct acpiphp_func *func; 668 669 if (!dev->subordinate) 670 return; 671 672 /* quirk, or pcie could set it already */ 673 if (dev->is_hotplug_bridge) 674 return; 675 676 if (PCI_SLOT(dev->devfn) != slot->device) 677 return; 678 679 list_for_each_entry(func, &slot->funcs, sibling) { 680 if (PCI_FUNC(dev->devfn) == func->function) { 681 /* check if this bridge has ejectable slots */ 682 if ((detect_ejectable_slots(func->handle) > 0)) 683 dev->is_hotplug_bridge = 1; 684 break; 685 } 686 } 687 } 688 689 /** 690 * enable_device - enable, configure a slot 691 * @slot: slot to be enabled 692 * 693 * This function should be called per *physical slot*, 694 * not per each slot object in ACPI namespace. 695 */ 696 static int __ref enable_device(struct acpiphp_slot *slot) 697 { 698 struct pci_dev *dev; 699 struct pci_bus *bus = slot->bridge->pci_bus; 700 struct acpiphp_func *func; 701 int num, max, pass; 702 LIST_HEAD(add_list); 703 704 if (slot->flags & SLOT_ENABLED) 705 goto err_exit; 706 707 list_for_each_entry(func, &slot->funcs, sibling) 708 acpiphp_bus_add(func); 709 710 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 711 if (num == 0) { 712 /* Maybe only part of funcs are added. */ 713 dbg("No new device found\n"); 714 goto err_exit; 715 } 716 717 max = acpiphp_max_busnr(bus); 718 for (pass = 0; pass < 2; pass++) { 719 list_for_each_entry(dev, &bus->devices, bus_list) { 720 if (PCI_SLOT(dev->devfn) != slot->device) 721 continue; 722 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 723 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 724 max = pci_scan_bridge(bus, dev, max, pass); 725 if (pass && dev->subordinate) { 726 check_hotplug_bridge(slot, dev); 727 pcibios_resource_survey_bus(dev->subordinate); 728 __pci_bus_size_bridges(dev->subordinate, 729 &add_list); 730 } 731 } 732 } 733 } 734 735 __pci_bus_assign_resources(bus, &add_list, NULL); 736 acpiphp_sanitize_bus(bus); 737 acpiphp_set_hpp_values(bus); 738 acpiphp_set_acpi_region(slot); 739 pci_enable_bridges(bus); 740 741 list_for_each_entry(dev, &bus->devices, bus_list) { 742 /* Assume that newly added devices are powered on already. */ 743 if (!dev->is_added) 744 dev->current_state = PCI_D0; 745 } 746 747 pci_bus_add_devices(bus); 748 749 slot->flags |= SLOT_ENABLED; 750 list_for_each_entry(func, &slot->funcs, sibling) { 751 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 752 func->function)); 753 if (!dev) { 754 /* Do not set SLOT_ENABLED flag if some funcs 755 are not added. */ 756 slot->flags &= (~SLOT_ENABLED); 757 continue; 758 } 759 } 760 761 762 err_exit: 763 return 0; 764 } 765 766 /* return first device in slot, acquiring a reference on it */ 767 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 768 { 769 struct pci_bus *bus = slot->bridge->pci_bus; 770 struct pci_dev *dev; 771 struct pci_dev *ret = NULL; 772 773 down_read(&pci_bus_sem); 774 list_for_each_entry(dev, &bus->devices, bus_list) 775 if (PCI_SLOT(dev->devfn) == slot->device) { 776 ret = pci_dev_get(dev); 777 break; 778 } 779 up_read(&pci_bus_sem); 780 781 return ret; 782 } 783 784 /** 785 * disable_device - disable a slot 786 * @slot: ACPI PHP slot 787 */ 788 static int disable_device(struct acpiphp_slot *slot) 789 { 790 struct acpiphp_func *func; 791 struct pci_dev *pdev; 792 793 /* 794 * enable_device() enumerates all functions in this device via 795 * pci_scan_slot(), whether they have associated ACPI hotplug 796 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 797 * here. 798 */ 799 while ((pdev = dev_in_slot(slot))) { 800 pci_stop_and_remove_bus_device(pdev); 801 pci_dev_put(pdev); 802 } 803 804 list_for_each_entry(func, &slot->funcs, sibling) { 805 acpiphp_bus_trim(func->handle); 806 } 807 808 slot->flags &= (~SLOT_ENABLED); 809 810 return 0; 811 } 812 813 814 /** 815 * get_slot_status - get ACPI slot status 816 * @slot: ACPI PHP slot 817 * 818 * If a slot has _STA for each function and if any one of them 819 * returned non-zero status, return it. 820 * 821 * If a slot doesn't have _STA and if any one of its functions' 822 * configuration space is configured, return 0x0f as a _STA. 823 * 824 * Otherwise return 0. 825 */ 826 static unsigned int get_slot_status(struct acpiphp_slot *slot) 827 { 828 acpi_status status; 829 unsigned long long sta = 0; 830 u32 dvid; 831 struct acpiphp_func *func; 832 833 list_for_each_entry(func, &slot->funcs, sibling) { 834 if (func->flags & FUNC_HAS_STA) { 835 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 836 if (ACPI_SUCCESS(status) && sta) 837 break; 838 } else { 839 pci_bus_read_config_dword(slot->bridge->pci_bus, 840 PCI_DEVFN(slot->device, 841 func->function), 842 PCI_VENDOR_ID, &dvid); 843 if (dvid != 0xffffffff) { 844 sta = ACPI_STA_ALL; 845 break; 846 } 847 } 848 } 849 850 return (unsigned int)sta; 851 } 852 853 /** 854 * acpiphp_eject_slot - physically eject the slot 855 * @slot: ACPI PHP slot 856 */ 857 int acpiphp_eject_slot(struct acpiphp_slot *slot) 858 { 859 struct acpiphp_func *func; 860 861 list_for_each_entry(func, &slot->funcs, sibling) { 862 /* We don't want to call _EJ0 on non-existing functions. */ 863 if ((func->flags & FUNC_HAS_EJ0)) { 864 if (ACPI_FAILURE(acpi_evaluate_ej0(func->handle))) 865 return -1; 866 else 867 break; 868 } 869 } 870 return 0; 871 } 872 873 /** 874 * acpiphp_check_bridge - re-enumerate devices 875 * @bridge: where to begin re-enumeration 876 * 877 * Iterate over all slots under this bridge and make sure that if a 878 * card is present they are enabled, and if not they are disabled. 879 */ 880 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 881 { 882 struct acpiphp_slot *slot; 883 int retval = 0; 884 int enabled, disabled; 885 886 enabled = disabled = 0; 887 888 list_for_each_entry(slot, &bridge->slots, node) { 889 unsigned int status = get_slot_status(slot); 890 if (slot->flags & SLOT_ENABLED) { 891 if (status == ACPI_STA_ALL) 892 continue; 893 retval = acpiphp_disable_slot(slot); 894 if (retval) { 895 err("Error occurred in disabling\n"); 896 goto err_exit; 897 } else { 898 acpiphp_eject_slot(slot); 899 } 900 disabled++; 901 } else { 902 if (status != ACPI_STA_ALL) 903 continue; 904 retval = acpiphp_enable_slot(slot); 905 if (retval) { 906 err("Error occurred in enabling\n"); 907 goto err_exit; 908 } 909 enabled++; 910 } 911 } 912 913 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); 914 915 err_exit: 916 return retval; 917 } 918 919 static void acpiphp_set_hpp_values(struct pci_bus *bus) 920 { 921 struct pci_dev *dev; 922 923 list_for_each_entry(dev, &bus->devices, bus_list) 924 pci_configure_slot(dev); 925 } 926 927 /* 928 * Remove devices for which we could not assign resources, call 929 * arch specific code to fix-up the bus 930 */ 931 static void acpiphp_sanitize_bus(struct pci_bus *bus) 932 { 933 struct pci_dev *dev, *tmp; 934 int i; 935 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 936 937 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 938 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 939 struct resource *res = &dev->resource[i]; 940 if ((res->flags & type_mask) && !res->start && 941 res->end) { 942 /* Could not assign a required resources 943 * for this device, remove it */ 944 pci_stop_and_remove_bus_device(dev); 945 break; 946 } 947 } 948 } 949 } 950 951 /* 952 * ACPI event handlers 953 */ 954 955 static acpi_status 956 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 957 { 958 struct acpiphp_bridge *bridge; 959 char objname[64]; 960 struct acpi_buffer buffer = { .length = sizeof(objname), 961 .pointer = objname }; 962 963 bridge = acpiphp_handle_to_bridge(handle); 964 if (bridge) { 965 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 966 dbg("%s: re-enumerating slots under %s\n", 967 __func__, objname); 968 acpiphp_check_bridge(bridge); 969 put_bridge(bridge); 970 } 971 return AE_OK ; 972 } 973 974 void acpiphp_check_host_bridge(acpi_handle handle) 975 { 976 struct acpiphp_bridge *bridge; 977 978 bridge = acpiphp_handle_to_bridge(handle); 979 if (bridge) { 980 acpiphp_check_bridge(bridge); 981 put_bridge(bridge); 982 } 983 984 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 985 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 986 } 987 988 static void _handle_hotplug_event_bridge(struct work_struct *work) 989 { 990 struct acpiphp_bridge *bridge; 991 char objname[64]; 992 struct acpi_buffer buffer = { .length = sizeof(objname), 993 .pointer = objname }; 994 struct acpi_hp_work *hp_work; 995 acpi_handle handle; 996 u32 type; 997 998 hp_work = container_of(work, struct acpi_hp_work, work); 999 handle = hp_work->handle; 1000 type = hp_work->type; 1001 bridge = (struct acpiphp_bridge *)hp_work->context; 1002 1003 acpi_scan_lock_acquire(); 1004 1005 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1006 1007 switch (type) { 1008 case ACPI_NOTIFY_BUS_CHECK: 1009 /* bus re-enumerate */ 1010 dbg("%s: Bus check notify on %s\n", __func__, objname); 1011 dbg("%s: re-enumerating slots under %s\n", __func__, objname); 1012 acpiphp_check_bridge(bridge); 1013 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1014 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); 1015 break; 1016 1017 case ACPI_NOTIFY_DEVICE_CHECK: 1018 /* device check */ 1019 dbg("%s: Device check notify on %s\n", __func__, objname); 1020 acpiphp_check_bridge(bridge); 1021 break; 1022 1023 case ACPI_NOTIFY_DEVICE_WAKE: 1024 /* wake event */ 1025 dbg("%s: Device wake notify on %s\n", __func__, objname); 1026 break; 1027 1028 case ACPI_NOTIFY_EJECT_REQUEST: 1029 /* request device eject */ 1030 dbg("%s: Device eject notify on %s\n", __func__, objname); 1031 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { 1032 struct acpiphp_slot *slot; 1033 slot = bridge->func->slot; 1034 if (!acpiphp_disable_slot(slot)) 1035 acpiphp_eject_slot(slot); 1036 } 1037 break; 1038 1039 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1040 printk(KERN_ERR "Device %s cannot be configured due" 1041 " to a frequency mismatch\n", objname); 1042 break; 1043 1044 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1045 printk(KERN_ERR "Device %s cannot be configured due" 1046 " to a bus mode mismatch\n", objname); 1047 break; 1048 1049 case ACPI_NOTIFY_POWER_FAULT: 1050 printk(KERN_ERR "Device %s has suffered a power fault\n", 1051 objname); 1052 break; 1053 1054 default: 1055 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1056 break; 1057 } 1058 1059 acpi_scan_lock_release(); 1060 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 1061 put_bridge(bridge); 1062 } 1063 1064 static void hotplug_event_func(acpi_handle handle, u32 type, void *context) 1065 { 1066 struct acpiphp_func *func = context; 1067 char objname[64]; 1068 struct acpi_buffer buffer = { .length = sizeof(objname), 1069 .pointer = objname }; 1070 1071 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1072 1073 switch (type) { 1074 case ACPI_NOTIFY_BUS_CHECK: 1075 /* bus re-enumerate */ 1076 dbg("%s: Bus check notify on %s\n", __func__, objname); 1077 acpiphp_enable_slot(func->slot); 1078 break; 1079 1080 case ACPI_NOTIFY_DEVICE_CHECK: 1081 /* device check : re-enumerate from parent bus */ 1082 dbg("%s: Device check notify on %s\n", __func__, objname); 1083 acpiphp_check_bridge(func->slot->bridge); 1084 break; 1085 1086 case ACPI_NOTIFY_DEVICE_WAKE: 1087 /* wake event */ 1088 dbg("%s: Device wake notify on %s\n", __func__, objname); 1089 break; 1090 1091 case ACPI_NOTIFY_EJECT_REQUEST: 1092 /* request device eject */ 1093 dbg("%s: Device eject notify on %s\n", __func__, objname); 1094 if (!(acpiphp_disable_slot(func->slot))) 1095 acpiphp_eject_slot(func->slot); 1096 break; 1097 1098 default: 1099 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1100 break; 1101 } 1102 } 1103 1104 static void _handle_hotplug_event_func(struct work_struct *work) 1105 { 1106 struct acpi_hp_work *hp_work; 1107 struct acpiphp_func *func; 1108 1109 hp_work = container_of(work, struct acpi_hp_work, work); 1110 func = hp_work->context; 1111 acpi_scan_lock_acquire(); 1112 1113 hotplug_event_func(hp_work->handle, hp_work->type, func); 1114 1115 acpi_scan_lock_release(); 1116 kfree(hp_work); /* allocated in handle_hotplug_event_func */ 1117 put_bridge(func->slot->bridge); 1118 } 1119 1120 /** 1121 * handle_hotplug_event - handle ACPI hotplug event 1122 * @handle: Notify()'ed acpi_handle 1123 * @type: Notify code 1124 * @data: pointer to acpiphp_context structure 1125 * 1126 * Handles ACPI event notification on slots. 1127 */ 1128 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 1129 { 1130 struct acpiphp_context *context; 1131 void (*work_func)(struct work_struct *work) = NULL; 1132 1133 mutex_lock(&acpiphp_context_lock); 1134 context = acpiphp_get_context(handle); 1135 if (context) { 1136 if (context->bridge) { 1137 get_bridge(context->bridge); 1138 data = context->bridge; 1139 work_func = _handle_hotplug_event_bridge; 1140 } else if (context->func) { 1141 get_bridge(context->func->slot->bridge); 1142 data = context->func; 1143 work_func = _handle_hotplug_event_func; 1144 } 1145 acpiphp_put_context(context); 1146 } 1147 mutex_unlock(&acpiphp_context_lock); 1148 1149 /* 1150 * Currently the code adds all hotplug events to the kacpid_wq 1151 * queue when it should add hotplug events to the kacpi_hotplug_wq. 1152 * The proper way to fix this is to reorganize the code so that 1153 * drivers (dock, etc.) do not call acpi_os_execute(), etc. 1154 * For now just re-add this work to the kacpi_hotplug_wq so we 1155 * don't deadlock on hotplug actions. 1156 */ 1157 if (work_func) 1158 alloc_acpi_hp_work(handle, type, data, work_func); 1159 } 1160 1161 /* 1162 * Create hotplug slots for the PCI bus. 1163 * It should always return 0 to avoid skipping following notifiers. 1164 */ 1165 void acpiphp_enumerate_slots(struct pci_bus *bus) 1166 { 1167 struct acpiphp_context *context; 1168 struct acpiphp_bridge *bridge; 1169 acpi_handle handle; 1170 acpi_status status; 1171 1172 if (acpiphp_disabled) 1173 return; 1174 1175 handle = ACPI_HANDLE(bus->bridge); 1176 if (!handle || detect_ejectable_slots(handle) <= 0) 1177 return; 1178 1179 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 1180 if (!bridge) { 1181 acpi_handle_err(handle, "No memory for bridge object\n"); 1182 return; 1183 } 1184 1185 INIT_LIST_HEAD(&bridge->slots); 1186 kref_init(&bridge->ref); 1187 bridge->handle = handle; 1188 bridge->pci_dev = pci_dev_get(bus->self); 1189 bridge->pci_bus = bus; 1190 1191 mutex_lock(&acpiphp_context_lock); 1192 context = acpiphp_get_context(handle); 1193 if (!context) { 1194 context = acpiphp_init_context(handle); 1195 if (!context) { 1196 mutex_unlock(&acpiphp_context_lock); 1197 acpi_handle_err(handle, "No hotplug context\n"); 1198 kfree(bridge); 1199 return; 1200 } 1201 } 1202 bridge->context = context; 1203 context->bridge = bridge; 1204 mutex_unlock(&acpiphp_context_lock); 1205 1206 /* 1207 * Grab a ref to the subordinate PCI bus in case the bus is 1208 * removed via PCI core logical hotplug. The ref pins the bus 1209 * (which we access during module unload). 1210 */ 1211 get_device(&bus->dev); 1212 1213 /* must be added to the list prior to calling register_slot */ 1214 mutex_lock(&bridge_mutex); 1215 list_add(&bridge->list, &bridge_list); 1216 mutex_unlock(&bridge_mutex); 1217 1218 /* register all slot objects under this bridge */ 1219 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, 1, 1220 register_slot, NULL, bridge, NULL); 1221 if (ACPI_FAILURE(status)) { 1222 acpi_handle_err(bridge->handle, "failed to register slots\n"); 1223 goto err; 1224 } 1225 1226 if (pci_is_root_bus(bridge->pci_bus)) 1227 return; 1228 1229 if (acpi_has_method(bridge->handle, "_EJ0")) { 1230 dbg("found ejectable p2p bridge\n"); 1231 bridge->flags |= BRIDGE_HAS_EJ0; 1232 } 1233 if (context->handler_for_func) { 1234 /* Notify handler already installed. */ 1235 bridge->func = context->func; 1236 get_bridge(context->func->slot->bridge); 1237 return; 1238 } 1239 1240 /* install notify handler for P2P bridges */ 1241 status = acpi_install_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY, 1242 handle_hotplug_event, NULL); 1243 if (ACPI_SUCCESS(status)) 1244 return; 1245 1246 acpi_handle_err(bridge->handle, "failed to register notify handler\n"); 1247 1248 err: 1249 cleanup_bridge(bridge); 1250 put_bridge(bridge); 1251 } 1252 1253 /* Destroy hotplug slots associated with the PCI bus */ 1254 void acpiphp_remove_slots(struct pci_bus *bus) 1255 { 1256 struct acpiphp_bridge *bridge, *tmp; 1257 1258 if (acpiphp_disabled) 1259 return; 1260 1261 list_for_each_entry_safe(bridge, tmp, &bridge_list, list) 1262 if (bridge->pci_bus == bus) { 1263 cleanup_bridge(bridge); 1264 put_bridge(bridge); 1265 break; 1266 } 1267 } 1268 1269 /** 1270 * acpiphp_enable_slot - power on slot 1271 * @slot: ACPI PHP slot 1272 */ 1273 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1274 { 1275 int retval; 1276 1277 mutex_lock(&slot->crit_sect); 1278 1279 /* wake up all functions */ 1280 retval = power_on_slot(slot); 1281 if (retval) 1282 goto err_exit; 1283 1284 if (get_slot_status(slot) == ACPI_STA_ALL) { 1285 /* configure all functions */ 1286 retval = enable_device(slot); 1287 if (retval) 1288 power_off_slot(slot); 1289 } else { 1290 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); 1291 power_off_slot(slot); 1292 } 1293 1294 err_exit: 1295 mutex_unlock(&slot->crit_sect); 1296 return retval; 1297 } 1298 1299 /** 1300 * acpiphp_disable_slot - power off slot 1301 * @slot: ACPI PHP slot 1302 */ 1303 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1304 { 1305 int retval = 0; 1306 1307 mutex_lock(&slot->crit_sect); 1308 1309 /* unconfigure all functions */ 1310 retval = disable_device(slot); 1311 if (retval) 1312 goto err_exit; 1313 1314 /* power off all functions */ 1315 retval = power_off_slot(slot); 1316 if (retval) 1317 goto err_exit; 1318 1319 err_exit: 1320 mutex_unlock(&slot->crit_sect); 1321 return retval; 1322 } 1323 1324 1325 /* 1326 * slot enabled: 1 1327 * slot disabled: 0 1328 */ 1329 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1330 { 1331 return (slot->flags & SLOT_POWEREDON); 1332 } 1333 1334 1335 /* 1336 * latch open: 1 1337 * latch closed: 0 1338 */ 1339 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1340 { 1341 unsigned int sta; 1342 1343 sta = get_slot_status(slot); 1344 1345 return (sta & ACPI_STA_DEVICE_UI) ? 0 : 1; 1346 } 1347 1348 1349 /* 1350 * adapter presence : 1 1351 * absence : 0 1352 */ 1353 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1354 { 1355 unsigned int sta; 1356 1357 sta = get_slot_status(slot); 1358 1359 return (sta == 0) ? 0 : 1; 1360 } 1361