1 /* 2 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or (at 12 * your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 */ 25 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <linux/types.h> 30 #include <linux/mutex.h> 31 #include <linux/pm.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/pci.h> 34 #include <linux/pci-acpi.h> 35 #include <linux/pci-aspm.h> 36 #include <linux/acpi.h> 37 #include <linux/slab.h> 38 #include <acpi/acpi_bus.h> 39 #include <acpi/acpi_drivers.h> 40 #include <acpi/apei.h> 41 42 #define PREFIX "ACPI: " 43 44 #define _COMPONENT ACPI_PCI_COMPONENT 45 ACPI_MODULE_NAME("pci_root"); 46 #define ACPI_PCI_ROOT_CLASS "pci_bridge" 47 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 48 static int acpi_pci_root_add(struct acpi_device *device, 49 const struct acpi_device_id *not_used); 50 static void acpi_pci_root_remove(struct acpi_device *device); 51 52 #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ 53 | OSC_ACTIVE_STATE_PWR_SUPPORT \ 54 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ 55 | OSC_MSI_SUPPORT) 56 57 static const struct acpi_device_id root_device_ids[] = { 58 {"PNP0A03", 0}, 59 {"", 0}, 60 }; 61 62 static struct acpi_scan_handler pci_root_handler = { 63 .ids = root_device_ids, 64 .attach = acpi_pci_root_add, 65 .detach = acpi_pci_root_remove, 66 }; 67 68 /* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */ 69 static DEFINE_MUTEX(acpi_pci_root_lock); 70 static LIST_HEAD(acpi_pci_roots); 71 static LIST_HEAD(acpi_pci_drivers); 72 73 static DEFINE_MUTEX(osc_lock); 74 75 int acpi_pci_register_driver(struct acpi_pci_driver *driver) 76 { 77 int n = 0; 78 struct acpi_pci_root *root; 79 80 mutex_lock(&acpi_pci_root_lock); 81 list_add_tail(&driver->node, &acpi_pci_drivers); 82 if (driver->add) 83 list_for_each_entry(root, &acpi_pci_roots, node) { 84 driver->add(root); 85 n++; 86 } 87 mutex_unlock(&acpi_pci_root_lock); 88 89 return n; 90 } 91 EXPORT_SYMBOL(acpi_pci_register_driver); 92 93 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) 94 { 95 struct acpi_pci_root *root; 96 97 mutex_lock(&acpi_pci_root_lock); 98 list_del(&driver->node); 99 if (driver->remove) 100 list_for_each_entry(root, &acpi_pci_roots, node) 101 driver->remove(root); 102 mutex_unlock(&acpi_pci_root_lock); 103 } 104 EXPORT_SYMBOL(acpi_pci_unregister_driver); 105 106 /** 107 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 108 * @handle - the ACPI CA node in question. 109 * 110 * Note: we could make this API take a struct acpi_device * instead, but 111 * for now, it's more convenient to operate on an acpi_handle. 112 */ 113 int acpi_is_root_bridge(acpi_handle handle) 114 { 115 int ret; 116 struct acpi_device *device; 117 118 ret = acpi_bus_get_device(handle, &device); 119 if (ret) 120 return 0; 121 122 ret = acpi_match_device_ids(device, root_device_ids); 123 if (ret) 124 return 0; 125 else 126 return 1; 127 } 128 EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 129 130 static acpi_status 131 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 132 { 133 struct resource *res = data; 134 struct acpi_resource_address64 address; 135 136 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && 137 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && 138 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) 139 return AE_OK; 140 141 acpi_resource_to_address64(resource, &address); 142 if ((address.address_length > 0) && 143 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 144 res->start = address.minimum; 145 res->end = address.minimum + address.address_length - 1; 146 } 147 148 return AE_OK; 149 } 150 151 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 152 struct resource *res) 153 { 154 acpi_status status; 155 156 res->start = -1; 157 status = 158 acpi_walk_resources(handle, METHOD_NAME__CRS, 159 get_root_bridge_busnr_callback, res); 160 if (ACPI_FAILURE(status)) 161 return status; 162 if (res->start == -1) 163 return AE_ERROR; 164 return AE_OK; 165 } 166 167 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 168 169 static acpi_status acpi_pci_run_osc(acpi_handle handle, 170 const u32 *capbuf, u32 *retval) 171 { 172 struct acpi_osc_context context = { 173 .uuid_str = pci_osc_uuid_str, 174 .rev = 1, 175 .cap.length = 12, 176 .cap.pointer = (void *)capbuf, 177 }; 178 acpi_status status; 179 180 status = acpi_run_osc(handle, &context); 181 if (ACPI_SUCCESS(status)) { 182 *retval = *((u32 *)(context.ret.pointer + 8)); 183 kfree(context.ret.pointer); 184 } 185 return status; 186 } 187 188 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 189 u32 support, 190 u32 *control) 191 { 192 acpi_status status; 193 u32 result, capbuf[3]; 194 195 support &= OSC_PCI_SUPPORT_MASKS; 196 support |= root->osc_support_set; 197 198 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 199 capbuf[OSC_SUPPORT_TYPE] = support; 200 if (control) { 201 *control &= OSC_PCI_CONTROL_MASKS; 202 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; 203 } else { 204 /* Run _OSC query for all possible controls. */ 205 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS; 206 } 207 208 status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 209 if (ACPI_SUCCESS(status)) { 210 root->osc_support_set = support; 211 if (control) 212 *control = result; 213 } 214 return status; 215 } 216 217 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 218 { 219 acpi_status status; 220 acpi_handle tmp; 221 222 status = acpi_get_handle(root->device->handle, "_OSC", &tmp); 223 if (ACPI_FAILURE(status)) 224 return status; 225 mutex_lock(&osc_lock); 226 status = acpi_pci_query_osc(root, flags, NULL); 227 mutex_unlock(&osc_lock); 228 return status; 229 } 230 231 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 232 { 233 struct acpi_pci_root *root; 234 struct acpi_device *device; 235 236 if (acpi_bus_get_device(handle, &device) || 237 acpi_match_device_ids(device, root_device_ids)) 238 return NULL; 239 240 root = acpi_driver_data(device); 241 242 return root; 243 } 244 EXPORT_SYMBOL_GPL(acpi_pci_find_root); 245 246 struct acpi_handle_node { 247 struct list_head node; 248 acpi_handle handle; 249 }; 250 251 /** 252 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 253 * @handle: the handle in question 254 * 255 * Given an ACPI CA handle, the desired PCI device is located in the 256 * list of PCI devices. 257 * 258 * If the device is found, its reference count is increased and this 259 * function returns a pointer to its data structure. The caller must 260 * decrement the reference count by calling pci_dev_put(). 261 * If no device is found, %NULL is returned. 262 */ 263 struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 264 { 265 int dev, fn; 266 unsigned long long adr; 267 acpi_status status; 268 acpi_handle phandle; 269 struct pci_bus *pbus; 270 struct pci_dev *pdev = NULL; 271 struct acpi_handle_node *node, *tmp; 272 struct acpi_pci_root *root; 273 LIST_HEAD(device_list); 274 275 /* 276 * Walk up the ACPI CA namespace until we reach a PCI root bridge. 277 */ 278 phandle = handle; 279 while (!acpi_is_root_bridge(phandle)) { 280 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 281 if (!node) 282 goto out; 283 284 INIT_LIST_HEAD(&node->node); 285 node->handle = phandle; 286 list_add(&node->node, &device_list); 287 288 status = acpi_get_parent(phandle, &phandle); 289 if (ACPI_FAILURE(status)) 290 goto out; 291 } 292 293 root = acpi_pci_find_root(phandle); 294 if (!root) 295 goto out; 296 297 pbus = root->bus; 298 299 /* 300 * Now, walk back down the PCI device tree until we return to our 301 * original handle. Assumes that everything between the PCI root 302 * bridge and the device we're looking for must be a P2P bridge. 303 */ 304 list_for_each_entry(node, &device_list, node) { 305 acpi_handle hnd = node->handle; 306 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 307 if (ACPI_FAILURE(status)) 308 goto out; 309 dev = (adr >> 16) & 0xffff; 310 fn = adr & 0xffff; 311 312 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 313 if (!pdev || hnd == handle) 314 break; 315 316 pbus = pdev->subordinate; 317 pci_dev_put(pdev); 318 319 /* 320 * This function may be called for a non-PCI device that has a 321 * PCI parent (eg. a disk under a PCI SATA controller). In that 322 * case pdev->subordinate will be NULL for the parent. 323 */ 324 if (!pbus) { 325 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 326 pdev = NULL; 327 break; 328 } 329 } 330 out: 331 list_for_each_entry_safe(node, tmp, &device_list, node) 332 kfree(node); 333 334 return pdev; 335 } 336 EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 337 338 /** 339 * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 340 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 341 * @mask: Mask of _OSC bits to request control of, place to store control mask. 342 * @req: Mask of _OSC bits the control of is essential to the caller. 343 * 344 * Run _OSC query for @mask and if that is successful, compare the returned 345 * mask of control bits with @req. If all of the @req bits are set in the 346 * returned mask, run _OSC request for it. 347 * 348 * The variable at the @mask address may be modified regardless of whether or 349 * not the function returns success. On success it will contain the mask of 350 * _OSC bits the BIOS has granted control of, but its contents are meaningless 351 * on failure. 352 **/ 353 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 354 { 355 struct acpi_pci_root *root; 356 acpi_status status; 357 u32 ctrl, capbuf[3]; 358 acpi_handle tmp; 359 360 if (!mask) 361 return AE_BAD_PARAMETER; 362 363 ctrl = *mask & OSC_PCI_CONTROL_MASKS; 364 if ((ctrl & req) != req) 365 return AE_TYPE; 366 367 root = acpi_pci_find_root(handle); 368 if (!root) 369 return AE_NOT_EXIST; 370 371 status = acpi_get_handle(handle, "_OSC", &tmp); 372 if (ACPI_FAILURE(status)) 373 return status; 374 375 mutex_lock(&osc_lock); 376 377 *mask = ctrl | root->osc_control_set; 378 /* No need to evaluate _OSC if the control was already granted. */ 379 if ((root->osc_control_set & ctrl) == ctrl) 380 goto out; 381 382 /* Need to check the available controls bits before requesting them. */ 383 while (*mask) { 384 status = acpi_pci_query_osc(root, root->osc_support_set, mask); 385 if (ACPI_FAILURE(status)) 386 goto out; 387 if (ctrl == *mask) 388 break; 389 ctrl = *mask; 390 } 391 392 if ((ctrl & req) != req) { 393 status = AE_SUPPORT; 394 goto out; 395 } 396 397 capbuf[OSC_QUERY_TYPE] = 0; 398 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; 399 capbuf[OSC_CONTROL_TYPE] = ctrl; 400 status = acpi_pci_run_osc(handle, capbuf, mask); 401 if (ACPI_SUCCESS(status)) 402 root->osc_control_set = *mask; 403 out: 404 mutex_unlock(&osc_lock); 405 return status; 406 } 407 EXPORT_SYMBOL(acpi_pci_osc_control_set); 408 409 static int acpi_pci_root_add(struct acpi_device *device, 410 const struct acpi_device_id *not_used) 411 { 412 unsigned long long segment, bus; 413 acpi_status status; 414 int result; 415 struct acpi_pci_root *root; 416 struct acpi_pci_driver *driver; 417 u32 flags, base_flags; 418 419 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 420 if (!root) 421 return -ENOMEM; 422 423 segment = 0; 424 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, 425 &segment); 426 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 427 printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); 428 result = -ENODEV; 429 goto end; 430 } 431 432 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 433 root->secondary.flags = IORESOURCE_BUS; 434 status = try_get_root_bridge_busnr(device->handle, &root->secondary); 435 if (ACPI_FAILURE(status)) { 436 /* 437 * We need both the start and end of the downstream bus range 438 * to interpret _CBA (MMCONFIG base address), so it really is 439 * supposed to be in _CRS. If we don't find it there, all we 440 * can do is assume [_BBN-0xFF] or [0-0xFF]. 441 */ 442 root->secondary.end = 0xFF; 443 printk(KERN_WARNING FW_BUG PREFIX 444 "no secondary bus range in _CRS\n"); 445 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, 446 NULL, &bus); 447 if (ACPI_SUCCESS(status)) 448 root->secondary.start = bus; 449 else if (status == AE_NOT_FOUND) 450 root->secondary.start = 0; 451 else { 452 printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); 453 result = -ENODEV; 454 goto end; 455 } 456 } 457 458 INIT_LIST_HEAD(&root->node); 459 root->device = device; 460 root->segment = segment & 0xFFFF; 461 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 462 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 463 device->driver_data = root; 464 465 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", 466 acpi_device_name(device), acpi_device_bid(device), 467 root->segment, &root->secondary); 468 469 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle); 470 471 /* 472 * All supported architectures that use ACPI have support for 473 * PCI domains, so we indicate this in _OSC support capabilities. 474 */ 475 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 476 acpi_pci_osc_support(root, flags); 477 478 /* 479 * TBD: Need PCI interface for enumeration/configuration of roots. 480 */ 481 482 mutex_lock(&acpi_pci_root_lock); 483 list_add_tail(&root->node, &acpi_pci_roots); 484 mutex_unlock(&acpi_pci_root_lock); 485 486 /* 487 * Scan the Root Bridge 488 * -------------------- 489 * Must do this prior to any attempt to bind the root device, as the 490 * PCI namespace does not get created until this call is made (and 491 * thus the root bridge's pci_dev does not exist). 492 */ 493 root->bus = pci_acpi_scan_root(root); 494 if (!root->bus) { 495 printk(KERN_ERR PREFIX 496 "Bus %04x:%02x not present in PCI namespace\n", 497 root->segment, (unsigned int)root->secondary.start); 498 result = -ENODEV; 499 goto out_del_root; 500 } 501 502 /* Indicate support for various _OSC capabilities. */ 503 if (pci_ext_cfg_avail()) 504 flags |= OSC_EXT_PCI_CONFIG_SUPPORT; 505 if (pcie_aspm_support_enabled()) { 506 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | 507 OSC_CLOCK_PWR_CAPABILITY_SUPPORT; 508 } 509 if (pci_msi_enabled()) 510 flags |= OSC_MSI_SUPPORT; 511 if (flags != base_flags) { 512 status = acpi_pci_osc_support(root, flags); 513 if (ACPI_FAILURE(status)) { 514 dev_info(&device->dev, "ACPI _OSC support " 515 "notification failed, disabling PCIe ASPM\n"); 516 pcie_no_aspm(); 517 flags = base_flags; 518 } 519 } 520 521 if (!pcie_ports_disabled 522 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { 523 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL 524 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 525 | OSC_PCI_EXPRESS_PME_CONTROL; 526 527 if (pci_aer_available()) { 528 if (aer_acpi_firmware_first()) 529 dev_dbg(&device->dev, 530 "PCIe errors handled by BIOS.\n"); 531 else 532 flags |= OSC_PCI_EXPRESS_AER_CONTROL; 533 } 534 535 dev_info(&device->dev, 536 "Requesting ACPI _OSC control (0x%02x)\n", flags); 537 538 status = acpi_pci_osc_control_set(device->handle, &flags, 539 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); 540 if (ACPI_SUCCESS(status)) { 541 dev_info(&device->dev, 542 "ACPI _OSC control (0x%02x) granted\n", flags); 543 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 544 /* 545 * We have ASPM control, but the FADT indicates 546 * that it's unsupported. Clear it. 547 */ 548 pcie_clear_aspm(root->bus); 549 } 550 } else { 551 dev_info(&device->dev, 552 "ACPI _OSC request failed (%s), " 553 "returned control mask: 0x%02x\n", 554 acpi_format_exception(status), flags); 555 pr_info("ACPI _OSC control for PCIe not granted, " 556 "disabling ASPM\n"); 557 pcie_no_aspm(); 558 } 559 } else { 560 dev_info(&device->dev, 561 "Unable to request _OSC control " 562 "(_OSC support mask: 0x%02x)\n", flags); 563 } 564 565 pci_acpi_add_bus_pm_notifier(device, root->bus); 566 if (device->wakeup.flags.run_wake) 567 device_set_run_wake(root->bus->bridge, true); 568 569 if (system_state != SYSTEM_BOOTING) { 570 pcibios_resource_survey_bus(root->bus); 571 pci_assign_unassigned_bus_resources(root->bus); 572 } 573 574 mutex_lock(&acpi_pci_root_lock); 575 list_for_each_entry(driver, &acpi_pci_drivers, node) 576 if (driver->add) 577 driver->add(root); 578 mutex_unlock(&acpi_pci_root_lock); 579 580 /* need to after hot-added ioapic is registered */ 581 if (system_state != SYSTEM_BOOTING) 582 pci_enable_bridges(root->bus); 583 584 pci_bus_add_devices(root->bus); 585 return 1; 586 587 out_del_root: 588 mutex_lock(&acpi_pci_root_lock); 589 list_del(&root->node); 590 mutex_unlock(&acpi_pci_root_lock); 591 592 end: 593 kfree(root); 594 return result; 595 } 596 597 static void acpi_pci_root_remove(struct acpi_device *device) 598 { 599 struct acpi_pci_root *root = acpi_driver_data(device); 600 struct acpi_pci_driver *driver; 601 602 pci_stop_root_bus(root->bus); 603 604 mutex_lock(&acpi_pci_root_lock); 605 list_for_each_entry_reverse(driver, &acpi_pci_drivers, node) 606 if (driver->remove) 607 driver->remove(root); 608 mutex_unlock(&acpi_pci_root_lock); 609 610 device_set_run_wake(root->bus->bridge, false); 611 pci_acpi_remove_bus_pm_notifier(device); 612 613 pci_remove_root_bus(root->bus); 614 615 mutex_lock(&acpi_pci_root_lock); 616 list_del(&root->node); 617 mutex_unlock(&acpi_pci_root_lock); 618 kfree(root); 619 } 620 621 void __init acpi_pci_root_init(void) 622 { 623 acpi_hest_init(); 624 625 if (!acpi_pci_disabled) { 626 pci_acpi_crs_quirks(); 627 acpi_scan_add_handler(&pci_root_handler); 628 } 629 } 630 /* Support root bridge hotplug */ 631 632 static void handle_root_bridge_insertion(acpi_handle handle) 633 { 634 struct acpi_device *device; 635 636 if (!acpi_bus_get_device(handle, &device)) { 637 printk(KERN_DEBUG "acpi device exists...\n"); 638 return; 639 } 640 641 if (acpi_bus_scan(handle)) 642 printk(KERN_ERR "cannot add bridge to acpi list\n"); 643 } 644 645 static void handle_root_bridge_removal(struct acpi_device *device) 646 { 647 acpi_status status; 648 struct acpi_eject_event *ej_event; 649 650 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); 651 if (!ej_event) { 652 /* Inform firmware the hot-remove operation has error */ 653 (void) acpi_evaluate_hotplug_ost(device->handle, 654 ACPI_NOTIFY_EJECT_REQUEST, 655 ACPI_OST_SC_NON_SPECIFIC_FAILURE, 656 NULL); 657 return; 658 } 659 660 ej_event->device = device; 661 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; 662 663 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); 664 if (ACPI_FAILURE(status)) 665 kfree(ej_event); 666 } 667 668 static void _handle_hotplug_event_root(struct work_struct *work) 669 { 670 struct acpi_pci_root *root; 671 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER }; 672 struct acpi_hp_work *hp_work; 673 acpi_handle handle; 674 u32 type; 675 676 hp_work = container_of(work, struct acpi_hp_work, work); 677 handle = hp_work->handle; 678 type = hp_work->type; 679 680 acpi_scan_lock_acquire(); 681 682 root = acpi_pci_find_root(handle); 683 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 684 685 switch (type) { 686 case ACPI_NOTIFY_BUS_CHECK: 687 /* bus enumerate */ 688 printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__, 689 (char *)buffer.pointer); 690 if (!root) 691 handle_root_bridge_insertion(handle); 692 693 break; 694 695 case ACPI_NOTIFY_DEVICE_CHECK: 696 /* device check */ 697 printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__, 698 (char *)buffer.pointer); 699 if (!root) 700 handle_root_bridge_insertion(handle); 701 break; 702 703 case ACPI_NOTIFY_EJECT_REQUEST: 704 /* request device eject */ 705 printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__, 706 (char *)buffer.pointer); 707 if (root) 708 handle_root_bridge_removal(root->device); 709 break; 710 default: 711 printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n", 712 type, (char *)buffer.pointer); 713 break; 714 } 715 716 acpi_scan_lock_release(); 717 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ 718 kfree(buffer.pointer); 719 } 720 721 static void handle_hotplug_event_root(acpi_handle handle, u32 type, 722 void *context) 723 { 724 alloc_acpi_hp_work(handle, type, context, 725 _handle_hotplug_event_root); 726 } 727 728 static acpi_status __init 729 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 730 { 731 acpi_status status; 732 char objname[64]; 733 struct acpi_buffer buffer = { .length = sizeof(objname), 734 .pointer = objname }; 735 int *count = (int *)context; 736 737 if (!acpi_is_root_bridge(handle)) 738 return AE_OK; 739 740 (*count)++; 741 742 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 743 744 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 745 handle_hotplug_event_root, NULL); 746 if (ACPI_FAILURE(status)) 747 printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n", 748 objname, (unsigned int)status); 749 else 750 printk(KERN_DEBUG "acpi root: %s notify handler is installed\n", 751 objname); 752 753 return AE_OK; 754 } 755 756 void __init acpi_pci_root_hp_init(void) 757 { 758 int num = 0; 759 760 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 761 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); 762 763 printk(KERN_DEBUG "Found %d acpi root devices\n", num); 764 } 765