1 /* 2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $) 3 * 4 * Copyright (C) 2000 Andrew Henroid 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * Copyright (c) 2008 Intel Corporation 8 * Author: Matthew Wilcox <willy@linux.intel.com> 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 27 * 28 */ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/slab.h> 33 #include <linux/mm.h> 34 #include <linux/pci.h> 35 #include <linux/interrupt.h> 36 #include <linux/kmod.h> 37 #include <linux/delay.h> 38 #include <linux/workqueue.h> 39 #include <linux/nmi.h> 40 #include <linux/acpi.h> 41 #include <linux/acpi_io.h> 42 #include <linux/efi.h> 43 #include <linux/ioport.h> 44 #include <linux/list.h> 45 #include <linux/jiffies.h> 46 #include <linux/semaphore.h> 47 48 #include <asm/io.h> 49 #include <asm/uaccess.h> 50 51 #include <acpi/acpi.h> 52 #include <acpi/acpi_bus.h> 53 #include <acpi/processor.h> 54 55 #define _COMPONENT ACPI_OS_SERVICES 56 ACPI_MODULE_NAME("osl"); 57 #define PREFIX "ACPI: " 58 struct acpi_os_dpc { 59 acpi_osd_exec_callback function; 60 void *context; 61 struct work_struct work; 62 int wait; 63 }; 64 65 #ifdef CONFIG_ACPI_CUSTOM_DSDT 66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 67 #endif 68 69 #ifdef ENABLE_DEBUGGER 70 #include <linux/kdb.h> 71 72 /* stuff for debugger support */ 73 int acpi_in_debugger; 74 EXPORT_SYMBOL(acpi_in_debugger); 75 76 extern char line_buf[80]; 77 #endif /*ENABLE_DEBUGGER */ 78 79 static acpi_osd_handler acpi_irq_handler; 80 static void *acpi_irq_context; 81 static struct workqueue_struct *kacpid_wq; 82 static struct workqueue_struct *kacpi_notify_wq; 83 struct workqueue_struct *kacpi_hotplug_wq; 84 EXPORT_SYMBOL(kacpi_hotplug_wq); 85 86 /* 87 * This list of permanent mappings is for memory that may be accessed from 88 * interrupt context, where we can't do the ioremap(). 89 */ 90 struct acpi_ioremap { 91 struct list_head list; 92 void __iomem *virt; 93 acpi_physical_address phys; 94 acpi_size size; 95 unsigned long refcount; 96 }; 97 98 static LIST_HEAD(acpi_ioremaps); 99 static DEFINE_MUTEX(acpi_ioremap_lock); 100 101 static void __init acpi_osi_setup_late(void); 102 103 /* 104 * The story of _OSI(Linux) 105 * 106 * From pre-history through Linux-2.6.22, 107 * Linux responded TRUE upon a BIOS OSI(Linux) query. 108 * 109 * Unfortunately, reference BIOS writers got wind of this 110 * and put OSI(Linux) in their example code, quickly exposing 111 * this string as ill-conceived and opening the door to 112 * an un-bounded number of BIOS incompatibilities. 113 * 114 * For example, OSI(Linux) was used on resume to re-POST a 115 * video card on one system, because Linux at that time 116 * could not do a speedy restore in its native driver. 117 * But then upon gaining quick native restore capability, 118 * Linux has no way to tell the BIOS to skip the time-consuming 119 * POST -- putting Linux at a permanent performance disadvantage. 120 * On another system, the BIOS writer used OSI(Linux) 121 * to infer native OS support for IPMI! On other systems, 122 * OSI(Linux) simply got in the way of Linux claiming to 123 * be compatible with other operating systems, exposing 124 * BIOS issues such as skipped device initialization. 125 * 126 * So "Linux" turned out to be a really poor chose of 127 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 128 * 129 * BIOS writers should NOT query _OSI(Linux) on future systems. 130 * Linux will complain on the console when it sees it, and return FALSE. 131 * To get Linux to return TRUE for your system will require 132 * a kernel source update to add a DMI entry, 133 * or boot with "acpi_osi=Linux" 134 */ 135 136 static struct osi_linux { 137 unsigned int enable:1; 138 unsigned int dmi:1; 139 unsigned int cmdline:1; 140 } osi_linux = {0, 0, 0}; 141 142 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 143 { 144 if (!strcmp("Linux", interface)) { 145 146 printk_once(KERN_NOTICE FW_BUG PREFIX 147 "BIOS _OSI(Linux) query %s%s\n", 148 osi_linux.enable ? "honored" : "ignored", 149 osi_linux.cmdline ? " via cmdline" : 150 osi_linux.dmi ? " via DMI" : ""); 151 } 152 153 return supported; 154 } 155 156 static void __init acpi_request_region (struct acpi_generic_address *gas, 157 unsigned int length, char *desc) 158 { 159 u64 addr; 160 161 /* Handle possible alignment issues */ 162 memcpy(&addr, &gas->address, sizeof(addr)); 163 if (!addr || !length) 164 return; 165 166 /* Resources are never freed */ 167 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 168 request_region(addr, length, desc); 169 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 170 request_mem_region(addr, length, desc); 171 } 172 173 static int __init acpi_reserve_resources(void) 174 { 175 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 176 "ACPI PM1a_EVT_BLK"); 177 178 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 179 "ACPI PM1b_EVT_BLK"); 180 181 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 182 "ACPI PM1a_CNT_BLK"); 183 184 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 185 "ACPI PM1b_CNT_BLK"); 186 187 if (acpi_gbl_FADT.pm_timer_length == 4) 188 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 189 190 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 191 "ACPI PM2_CNT_BLK"); 192 193 /* Length of GPE blocks must be a non-negative multiple of 2 */ 194 195 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 196 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 197 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 198 199 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 200 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 201 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 202 203 return 0; 204 } 205 device_initcall(acpi_reserve_resources); 206 207 void acpi_os_printf(const char *fmt, ...) 208 { 209 va_list args; 210 va_start(args, fmt); 211 acpi_os_vprintf(fmt, args); 212 va_end(args); 213 } 214 215 void acpi_os_vprintf(const char *fmt, va_list args) 216 { 217 static char buffer[512]; 218 219 vsprintf(buffer, fmt, args); 220 221 #ifdef ENABLE_DEBUGGER 222 if (acpi_in_debugger) { 223 kdb_printf("%s", buffer); 224 } else { 225 printk(KERN_CONT "%s", buffer); 226 } 227 #else 228 printk(KERN_CONT "%s", buffer); 229 #endif 230 } 231 232 #ifdef CONFIG_KEXEC 233 static unsigned long acpi_rsdp; 234 static int __init setup_acpi_rsdp(char *arg) 235 { 236 acpi_rsdp = simple_strtoul(arg, NULL, 16); 237 return 0; 238 } 239 early_param("acpi_rsdp", setup_acpi_rsdp); 240 #endif 241 242 acpi_physical_address __init acpi_os_get_root_pointer(void) 243 { 244 #ifdef CONFIG_KEXEC 245 if (acpi_rsdp) 246 return acpi_rsdp; 247 #endif 248 249 if (efi_enabled) { 250 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 251 return efi.acpi20; 252 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 253 return efi.acpi; 254 else { 255 printk(KERN_ERR PREFIX 256 "System description tables not found\n"); 257 return 0; 258 } 259 } else { 260 acpi_physical_address pa = 0; 261 262 acpi_find_root_pointer(&pa); 263 return pa; 264 } 265 } 266 267 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 268 static struct acpi_ioremap * 269 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 270 { 271 struct acpi_ioremap *map; 272 273 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 274 if (map->phys <= phys && 275 phys + size <= map->phys + map->size) 276 return map; 277 278 return NULL; 279 } 280 281 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 282 static void __iomem * 283 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 284 { 285 struct acpi_ioremap *map; 286 287 map = acpi_map_lookup(phys, size); 288 if (map) 289 return map->virt + (phys - map->phys); 290 291 return NULL; 292 } 293 294 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 295 { 296 struct acpi_ioremap *map; 297 void __iomem *virt = NULL; 298 299 mutex_lock(&acpi_ioremap_lock); 300 map = acpi_map_lookup(phys, size); 301 if (map) { 302 virt = map->virt + (phys - map->phys); 303 map->refcount++; 304 } 305 mutex_unlock(&acpi_ioremap_lock); 306 return virt; 307 } 308 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 309 310 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 311 static struct acpi_ioremap * 312 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 313 { 314 struct acpi_ioremap *map; 315 316 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 317 if (map->virt <= virt && 318 virt + size <= map->virt + map->size) 319 return map; 320 321 return NULL; 322 } 323 324 void __iomem *__init_refok 325 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 326 { 327 struct acpi_ioremap *map; 328 void __iomem *virt; 329 acpi_physical_address pg_off; 330 acpi_size pg_sz; 331 332 if (phys > ULONG_MAX) { 333 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 334 return NULL; 335 } 336 337 if (!acpi_gbl_permanent_mmap) 338 return __acpi_map_table((unsigned long)phys, size); 339 340 mutex_lock(&acpi_ioremap_lock); 341 /* Check if there's a suitable mapping already. */ 342 map = acpi_map_lookup(phys, size); 343 if (map) { 344 map->refcount++; 345 goto out; 346 } 347 348 map = kzalloc(sizeof(*map), GFP_KERNEL); 349 if (!map) { 350 mutex_unlock(&acpi_ioremap_lock); 351 return NULL; 352 } 353 354 pg_off = round_down(phys, PAGE_SIZE); 355 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 356 virt = acpi_os_ioremap(pg_off, pg_sz); 357 if (!virt) { 358 mutex_unlock(&acpi_ioremap_lock); 359 kfree(map); 360 return NULL; 361 } 362 363 INIT_LIST_HEAD(&map->list); 364 map->virt = virt; 365 map->phys = pg_off; 366 map->size = pg_sz; 367 map->refcount = 1; 368 369 list_add_tail_rcu(&map->list, &acpi_ioremaps); 370 371 out: 372 mutex_unlock(&acpi_ioremap_lock); 373 return map->virt + (phys - map->phys); 374 } 375 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 376 377 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 378 { 379 if (!--map->refcount) 380 list_del_rcu(&map->list); 381 } 382 383 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 384 { 385 if (!map->refcount) { 386 synchronize_rcu(); 387 iounmap(map->virt); 388 kfree(map); 389 } 390 } 391 392 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 393 { 394 struct acpi_ioremap *map; 395 396 if (!acpi_gbl_permanent_mmap) { 397 __acpi_unmap_table(virt, size); 398 return; 399 } 400 401 mutex_lock(&acpi_ioremap_lock); 402 map = acpi_map_lookup_virt(virt, size); 403 if (!map) { 404 mutex_unlock(&acpi_ioremap_lock); 405 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 406 return; 407 } 408 acpi_os_drop_map_ref(map); 409 mutex_unlock(&acpi_ioremap_lock); 410 411 acpi_os_map_cleanup(map); 412 } 413 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 414 415 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 416 { 417 if (!acpi_gbl_permanent_mmap) 418 __acpi_unmap_table(virt, size); 419 } 420 421 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 422 { 423 u64 addr; 424 void __iomem *virt; 425 426 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 427 return 0; 428 429 /* Handle possible alignment issues */ 430 memcpy(&addr, &gas->address, sizeof(addr)); 431 if (!addr || !gas->bit_width) 432 return -EINVAL; 433 434 virt = acpi_os_map_memory(addr, gas->bit_width / 8); 435 if (!virt) 436 return -EIO; 437 438 return 0; 439 } 440 EXPORT_SYMBOL(acpi_os_map_generic_address); 441 442 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 443 { 444 u64 addr; 445 struct acpi_ioremap *map; 446 447 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 448 return; 449 450 /* Handle possible alignment issues */ 451 memcpy(&addr, &gas->address, sizeof(addr)); 452 if (!addr || !gas->bit_width) 453 return; 454 455 mutex_lock(&acpi_ioremap_lock); 456 map = acpi_map_lookup(addr, gas->bit_width / 8); 457 if (!map) { 458 mutex_unlock(&acpi_ioremap_lock); 459 return; 460 } 461 acpi_os_drop_map_ref(map); 462 mutex_unlock(&acpi_ioremap_lock); 463 464 acpi_os_map_cleanup(map); 465 } 466 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 467 468 #ifdef ACPI_FUTURE_USAGE 469 acpi_status 470 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 471 { 472 if (!phys || !virt) 473 return AE_BAD_PARAMETER; 474 475 *phys = virt_to_phys(virt); 476 477 return AE_OK; 478 } 479 #endif 480 481 #define ACPI_MAX_OVERRIDE_LEN 100 482 483 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 484 485 acpi_status 486 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 487 acpi_string * new_val) 488 { 489 if (!init_val || !new_val) 490 return AE_BAD_PARAMETER; 491 492 *new_val = NULL; 493 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 494 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 495 acpi_os_name); 496 *new_val = acpi_os_name; 497 } 498 499 return AE_OK; 500 } 501 502 acpi_status 503 acpi_os_table_override(struct acpi_table_header * existing_table, 504 struct acpi_table_header ** new_table) 505 { 506 if (!existing_table || !new_table) 507 return AE_BAD_PARAMETER; 508 509 *new_table = NULL; 510 511 #ifdef CONFIG_ACPI_CUSTOM_DSDT 512 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 513 *new_table = (struct acpi_table_header *)AmlCode; 514 #endif 515 if (*new_table != NULL) { 516 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 517 "this is unsafe: tainting kernel\n", 518 existing_table->signature, 519 existing_table->oem_table_id); 520 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 521 } 522 return AE_OK; 523 } 524 525 static irqreturn_t acpi_irq(int irq, void *dev_id) 526 { 527 u32 handled; 528 529 handled = (*acpi_irq_handler) (acpi_irq_context); 530 531 if (handled) { 532 acpi_irq_handled++; 533 return IRQ_HANDLED; 534 } else { 535 acpi_irq_not_handled++; 536 return IRQ_NONE; 537 } 538 } 539 540 acpi_status 541 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 542 void *context) 543 { 544 unsigned int irq; 545 546 acpi_irq_stats_init(); 547 548 /* 549 * ACPI interrupts different from the SCI in our copy of the FADT are 550 * not supported. 551 */ 552 if (gsi != acpi_gbl_FADT.sci_interrupt) 553 return AE_BAD_PARAMETER; 554 555 if (acpi_irq_handler) 556 return AE_ALREADY_ACQUIRED; 557 558 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 559 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 560 gsi); 561 return AE_OK; 562 } 563 564 acpi_irq_handler = handler; 565 acpi_irq_context = context; 566 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 567 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 568 acpi_irq_handler = NULL; 569 return AE_NOT_ACQUIRED; 570 } 571 572 return AE_OK; 573 } 574 575 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 576 { 577 if (irq != acpi_gbl_FADT.sci_interrupt) 578 return AE_BAD_PARAMETER; 579 580 free_irq(irq, acpi_irq); 581 acpi_irq_handler = NULL; 582 583 return AE_OK; 584 } 585 586 /* 587 * Running in interpreter thread context, safe to sleep 588 */ 589 590 void acpi_os_sleep(u64 ms) 591 { 592 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 593 } 594 595 void acpi_os_stall(u32 us) 596 { 597 while (us) { 598 u32 delay = 1000; 599 600 if (delay > us) 601 delay = us; 602 udelay(delay); 603 touch_nmi_watchdog(); 604 us -= delay; 605 } 606 } 607 608 /* 609 * Support ACPI 3.0 AML Timer operand 610 * Returns 64-bit free-running, monotonically increasing timer 611 * with 100ns granularity 612 */ 613 u64 acpi_os_get_timer(void) 614 { 615 static u64 t; 616 617 #ifdef CONFIG_HPET 618 /* TBD: use HPET if available */ 619 #endif 620 621 #ifdef CONFIG_X86_PM_TIMER 622 /* TBD: default to PM timer if HPET was not available */ 623 #endif 624 if (!t) 625 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 626 627 return ++t; 628 } 629 630 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 631 { 632 u32 dummy; 633 634 if (!value) 635 value = &dummy; 636 637 *value = 0; 638 if (width <= 8) { 639 *(u8 *) value = inb(port); 640 } else if (width <= 16) { 641 *(u16 *) value = inw(port); 642 } else if (width <= 32) { 643 *(u32 *) value = inl(port); 644 } else { 645 BUG(); 646 } 647 648 return AE_OK; 649 } 650 651 EXPORT_SYMBOL(acpi_os_read_port); 652 653 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 654 { 655 if (width <= 8) { 656 outb(value, port); 657 } else if (width <= 16) { 658 outw(value, port); 659 } else if (width <= 32) { 660 outl(value, port); 661 } else { 662 BUG(); 663 } 664 665 return AE_OK; 666 } 667 668 EXPORT_SYMBOL(acpi_os_write_port); 669 670 acpi_status 671 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 672 { 673 void __iomem *virt_addr; 674 unsigned int size = width / 8; 675 bool unmap = false; 676 u32 dummy; 677 678 rcu_read_lock(); 679 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 680 if (!virt_addr) { 681 rcu_read_unlock(); 682 virt_addr = acpi_os_ioremap(phys_addr, size); 683 if (!virt_addr) 684 return AE_BAD_ADDRESS; 685 unmap = true; 686 } 687 688 if (!value) 689 value = &dummy; 690 691 switch (width) { 692 case 8: 693 *(u8 *) value = readb(virt_addr); 694 break; 695 case 16: 696 *(u16 *) value = readw(virt_addr); 697 break; 698 case 32: 699 *(u32 *) value = readl(virt_addr); 700 break; 701 default: 702 BUG(); 703 } 704 705 if (unmap) 706 iounmap(virt_addr); 707 else 708 rcu_read_unlock(); 709 710 return AE_OK; 711 } 712 713 acpi_status 714 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 715 { 716 void __iomem *virt_addr; 717 unsigned int size = width / 8; 718 bool unmap = false; 719 720 rcu_read_lock(); 721 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 722 if (!virt_addr) { 723 rcu_read_unlock(); 724 virt_addr = acpi_os_ioremap(phys_addr, size); 725 if (!virt_addr) 726 return AE_BAD_ADDRESS; 727 unmap = true; 728 } 729 730 switch (width) { 731 case 8: 732 writeb(value, virt_addr); 733 break; 734 case 16: 735 writew(value, virt_addr); 736 break; 737 case 32: 738 writel(value, virt_addr); 739 break; 740 default: 741 BUG(); 742 } 743 744 if (unmap) 745 iounmap(virt_addr); 746 else 747 rcu_read_unlock(); 748 749 return AE_OK; 750 } 751 752 acpi_status 753 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 754 u64 *value, u32 width) 755 { 756 int result, size; 757 u32 value32; 758 759 if (!value) 760 return AE_BAD_PARAMETER; 761 762 switch (width) { 763 case 8: 764 size = 1; 765 break; 766 case 16: 767 size = 2; 768 break; 769 case 32: 770 size = 4; 771 break; 772 default: 773 return AE_ERROR; 774 } 775 776 result = raw_pci_read(pci_id->segment, pci_id->bus, 777 PCI_DEVFN(pci_id->device, pci_id->function), 778 reg, size, &value32); 779 *value = value32; 780 781 return (result ? AE_ERROR : AE_OK); 782 } 783 784 acpi_status 785 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 786 u64 value, u32 width) 787 { 788 int result, size; 789 790 switch (width) { 791 case 8: 792 size = 1; 793 break; 794 case 16: 795 size = 2; 796 break; 797 case 32: 798 size = 4; 799 break; 800 default: 801 return AE_ERROR; 802 } 803 804 result = raw_pci_write(pci_id->segment, pci_id->bus, 805 PCI_DEVFN(pci_id->device, pci_id->function), 806 reg, size, value); 807 808 return (result ? AE_ERROR : AE_OK); 809 } 810 811 static void acpi_os_execute_deferred(struct work_struct *work) 812 { 813 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 814 815 if (dpc->wait) 816 acpi_os_wait_events_complete(NULL); 817 818 dpc->function(dpc->context); 819 kfree(dpc); 820 } 821 822 /******************************************************************************* 823 * 824 * FUNCTION: acpi_os_execute 825 * 826 * PARAMETERS: Type - Type of the callback 827 * Function - Function to be executed 828 * Context - Function parameters 829 * 830 * RETURN: Status 831 * 832 * DESCRIPTION: Depending on type, either queues function for deferred execution or 833 * immediately executes function on a separate thread. 834 * 835 ******************************************************************************/ 836 837 static acpi_status __acpi_os_execute(acpi_execute_type type, 838 acpi_osd_exec_callback function, void *context, int hp) 839 { 840 acpi_status status = AE_OK; 841 struct acpi_os_dpc *dpc; 842 struct workqueue_struct *queue; 843 int ret; 844 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 845 "Scheduling function [%p(%p)] for deferred execution.\n", 846 function, context)); 847 848 /* 849 * Allocate/initialize DPC structure. Note that this memory will be 850 * freed by the callee. The kernel handles the work_struct list in a 851 * way that allows us to also free its memory inside the callee. 852 * Because we may want to schedule several tasks with different 853 * parameters we can't use the approach some kernel code uses of 854 * having a static work_struct. 855 */ 856 857 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 858 if (!dpc) 859 return AE_NO_MEMORY; 860 861 dpc->function = function; 862 dpc->context = context; 863 864 /* 865 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq 866 * because the hotplug code may call driver .remove() functions, 867 * which invoke flush_scheduled_work/acpi_os_wait_events_complete 868 * to flush these workqueues. 869 */ 870 queue = hp ? kacpi_hotplug_wq : 871 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); 872 dpc->wait = hp ? 1 : 0; 873 874 if (queue == kacpi_hotplug_wq) 875 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 876 else if (queue == kacpi_notify_wq) 877 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 878 else 879 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 880 881 /* 882 * On some machines, a software-initiated SMI causes corruption unless 883 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 884 * typically it's done in GPE-related methods that are run via 885 * workqueues, so we can avoid the known corruption cases by always 886 * queueing on CPU 0. 887 */ 888 ret = queue_work_on(0, queue, &dpc->work); 889 890 if (!ret) { 891 printk(KERN_ERR PREFIX 892 "Call to queue_work() failed.\n"); 893 status = AE_ERROR; 894 kfree(dpc); 895 } 896 return status; 897 } 898 899 acpi_status acpi_os_execute(acpi_execute_type type, 900 acpi_osd_exec_callback function, void *context) 901 { 902 return __acpi_os_execute(type, function, context, 0); 903 } 904 EXPORT_SYMBOL(acpi_os_execute); 905 906 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function, 907 void *context) 908 { 909 return __acpi_os_execute(0, function, context, 1); 910 } 911 912 void acpi_os_wait_events_complete(void *context) 913 { 914 flush_workqueue(kacpid_wq); 915 flush_workqueue(kacpi_notify_wq); 916 } 917 918 EXPORT_SYMBOL(acpi_os_wait_events_complete); 919 920 acpi_status 921 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 922 { 923 struct semaphore *sem = NULL; 924 925 sem = acpi_os_allocate(sizeof(struct semaphore)); 926 if (!sem) 927 return AE_NO_MEMORY; 928 memset(sem, 0, sizeof(struct semaphore)); 929 930 sema_init(sem, initial_units); 931 932 *handle = (acpi_handle *) sem; 933 934 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 935 *handle, initial_units)); 936 937 return AE_OK; 938 } 939 940 /* 941 * TODO: A better way to delete semaphores? Linux doesn't have a 942 * 'delete_semaphore()' function -- may result in an invalid 943 * pointer dereference for non-synchronized consumers. Should 944 * we at least check for blocked threads and signal/cancel them? 945 */ 946 947 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 948 { 949 struct semaphore *sem = (struct semaphore *)handle; 950 951 if (!sem) 952 return AE_BAD_PARAMETER; 953 954 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 955 956 BUG_ON(!list_empty(&sem->wait_list)); 957 kfree(sem); 958 sem = NULL; 959 960 return AE_OK; 961 } 962 963 /* 964 * TODO: Support for units > 1? 965 */ 966 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 967 { 968 acpi_status status = AE_OK; 969 struct semaphore *sem = (struct semaphore *)handle; 970 long jiffies; 971 int ret = 0; 972 973 if (!sem || (units < 1)) 974 return AE_BAD_PARAMETER; 975 976 if (units > 1) 977 return AE_SUPPORT; 978 979 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 980 handle, units, timeout)); 981 982 if (timeout == ACPI_WAIT_FOREVER) 983 jiffies = MAX_SCHEDULE_TIMEOUT; 984 else 985 jiffies = msecs_to_jiffies(timeout); 986 987 ret = down_timeout(sem, jiffies); 988 if (ret) 989 status = AE_TIME; 990 991 if (ACPI_FAILURE(status)) { 992 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 993 "Failed to acquire semaphore[%p|%d|%d], %s", 994 handle, units, timeout, 995 acpi_format_exception(status))); 996 } else { 997 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 998 "Acquired semaphore[%p|%d|%d]", handle, 999 units, timeout)); 1000 } 1001 1002 return status; 1003 } 1004 1005 /* 1006 * TODO: Support for units > 1? 1007 */ 1008 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1009 { 1010 struct semaphore *sem = (struct semaphore *)handle; 1011 1012 if (!sem || (units < 1)) 1013 return AE_BAD_PARAMETER; 1014 1015 if (units > 1) 1016 return AE_SUPPORT; 1017 1018 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1019 units)); 1020 1021 up(sem); 1022 1023 return AE_OK; 1024 } 1025 1026 #ifdef ACPI_FUTURE_USAGE 1027 u32 acpi_os_get_line(char *buffer) 1028 { 1029 1030 #ifdef ENABLE_DEBUGGER 1031 if (acpi_in_debugger) { 1032 u32 chars; 1033 1034 kdb_read(buffer, sizeof(line_buf)); 1035 1036 /* remove the CR kdb includes */ 1037 chars = strlen(buffer) - 1; 1038 buffer[chars] = '\0'; 1039 } 1040 #endif 1041 1042 return 0; 1043 } 1044 #endif /* ACPI_FUTURE_USAGE */ 1045 1046 acpi_status acpi_os_signal(u32 function, void *info) 1047 { 1048 switch (function) { 1049 case ACPI_SIGNAL_FATAL: 1050 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1051 break; 1052 case ACPI_SIGNAL_BREAKPOINT: 1053 /* 1054 * AML Breakpoint 1055 * ACPI spec. says to treat it as a NOP unless 1056 * you are debugging. So if/when we integrate 1057 * AML debugger into the kernel debugger its 1058 * hook will go here. But until then it is 1059 * not useful to print anything on breakpoints. 1060 */ 1061 break; 1062 default: 1063 break; 1064 } 1065 1066 return AE_OK; 1067 } 1068 1069 static int __init acpi_os_name_setup(char *str) 1070 { 1071 char *p = acpi_os_name; 1072 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1073 1074 if (!str || !*str) 1075 return 0; 1076 1077 for (; count-- && str && *str; str++) { 1078 if (isalnum(*str) || *str == ' ' || *str == ':') 1079 *p++ = *str; 1080 else if (*str == '\'' || *str == '"') 1081 continue; 1082 else 1083 break; 1084 } 1085 *p = 0; 1086 1087 return 1; 1088 1089 } 1090 1091 __setup("acpi_os_name=", acpi_os_name_setup); 1092 1093 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1094 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1095 1096 struct osi_setup_entry { 1097 char string[OSI_STRING_LENGTH_MAX]; 1098 bool enable; 1099 }; 1100 1101 static struct osi_setup_entry __initdata 1102 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = { 1103 {"Module Device", true}, 1104 {"Processor Device", true}, 1105 {"3.0 _SCP Extensions", true}, 1106 {"Processor Aggregator Device", true}, 1107 }; 1108 1109 void __init acpi_osi_setup(char *str) 1110 { 1111 struct osi_setup_entry *osi; 1112 bool enable = true; 1113 int i; 1114 1115 if (!acpi_gbl_create_osi_method) 1116 return; 1117 1118 if (str == NULL || *str == '\0') { 1119 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1120 acpi_gbl_create_osi_method = FALSE; 1121 return; 1122 } 1123 1124 if (*str == '!') { 1125 str++; 1126 enable = false; 1127 } 1128 1129 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1130 osi = &osi_setup_entries[i]; 1131 if (!strcmp(osi->string, str)) { 1132 osi->enable = enable; 1133 break; 1134 } else if (osi->string[0] == '\0') { 1135 osi->enable = enable; 1136 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1137 break; 1138 } 1139 } 1140 } 1141 1142 static void __init set_osi_linux(unsigned int enable) 1143 { 1144 if (osi_linux.enable != enable) 1145 osi_linux.enable = enable; 1146 1147 if (osi_linux.enable) 1148 acpi_osi_setup("Linux"); 1149 else 1150 acpi_osi_setup("!Linux"); 1151 1152 return; 1153 } 1154 1155 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1156 { 1157 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1158 osi_linux.dmi = 0; 1159 set_osi_linux(enable); 1160 1161 return; 1162 } 1163 1164 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1165 { 1166 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1167 1168 if (enable == -1) 1169 return; 1170 1171 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1172 set_osi_linux(enable); 1173 1174 return; 1175 } 1176 1177 /* 1178 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1179 * 1180 * empty string disables _OSI 1181 * string starting with '!' disables that string 1182 * otherwise string is added to list, augmenting built-in strings 1183 */ 1184 static void __init acpi_osi_setup_late(void) 1185 { 1186 struct osi_setup_entry *osi; 1187 char *str; 1188 int i; 1189 acpi_status status; 1190 1191 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1192 osi = &osi_setup_entries[i]; 1193 str = osi->string; 1194 1195 if (*str == '\0') 1196 break; 1197 if (osi->enable) { 1198 status = acpi_install_interface(str); 1199 1200 if (ACPI_SUCCESS(status)) 1201 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1202 } else { 1203 status = acpi_remove_interface(str); 1204 1205 if (ACPI_SUCCESS(status)) 1206 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1207 } 1208 } 1209 } 1210 1211 static int __init osi_setup(char *str) 1212 { 1213 if (str && !strcmp("Linux", str)) 1214 acpi_cmdline_osi_linux(1); 1215 else if (str && !strcmp("!Linux", str)) 1216 acpi_cmdline_osi_linux(0); 1217 else 1218 acpi_osi_setup(str); 1219 1220 return 1; 1221 } 1222 1223 __setup("acpi_osi=", osi_setup); 1224 1225 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1226 static int __init acpi_serialize_setup(char *str) 1227 { 1228 printk(KERN_INFO PREFIX "serialize enabled\n"); 1229 1230 acpi_gbl_all_methods_serialized = TRUE; 1231 1232 return 1; 1233 } 1234 1235 __setup("acpi_serialize", acpi_serialize_setup); 1236 1237 /* Check of resource interference between native drivers and ACPI 1238 * OperationRegions (SystemIO and System Memory only). 1239 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1240 * in arbitrary AML code and can interfere with legacy drivers. 1241 * acpi_enforce_resources= can be set to: 1242 * 1243 * - strict (default) (2) 1244 * -> further driver trying to access the resources will not load 1245 * - lax (1) 1246 * -> further driver trying to access the resources will load, but you 1247 * get a system message that something might go wrong... 1248 * 1249 * - no (0) 1250 * -> ACPI Operation Region resources will not be registered 1251 * 1252 */ 1253 #define ENFORCE_RESOURCES_STRICT 2 1254 #define ENFORCE_RESOURCES_LAX 1 1255 #define ENFORCE_RESOURCES_NO 0 1256 1257 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1258 1259 static int __init acpi_enforce_resources_setup(char *str) 1260 { 1261 if (str == NULL || *str == '\0') 1262 return 0; 1263 1264 if (!strcmp("strict", str)) 1265 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1266 else if (!strcmp("lax", str)) 1267 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1268 else if (!strcmp("no", str)) 1269 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1270 1271 return 1; 1272 } 1273 1274 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1275 1276 /* Check for resource conflicts between ACPI OperationRegions and native 1277 * drivers */ 1278 int acpi_check_resource_conflict(const struct resource *res) 1279 { 1280 acpi_adr_space_type space_id; 1281 acpi_size length; 1282 u8 warn = 0; 1283 int clash = 0; 1284 1285 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1286 return 0; 1287 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1288 return 0; 1289 1290 if (res->flags & IORESOURCE_IO) 1291 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1292 else 1293 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1294 1295 length = res->end - res->start + 1; 1296 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1297 warn = 1; 1298 clash = acpi_check_address_range(space_id, res->start, length, warn); 1299 1300 if (clash) { 1301 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1302 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1303 printk(KERN_NOTICE "ACPI: This conflict may" 1304 " cause random problems and system" 1305 " instability\n"); 1306 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1307 " for this device, you should use it instead of" 1308 " the native driver\n"); 1309 } 1310 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1311 return -EBUSY; 1312 } 1313 return 0; 1314 } 1315 EXPORT_SYMBOL(acpi_check_resource_conflict); 1316 1317 int acpi_check_region(resource_size_t start, resource_size_t n, 1318 const char *name) 1319 { 1320 struct resource res = { 1321 .start = start, 1322 .end = start + n - 1, 1323 .name = name, 1324 .flags = IORESOURCE_IO, 1325 }; 1326 1327 return acpi_check_resource_conflict(&res); 1328 } 1329 EXPORT_SYMBOL(acpi_check_region); 1330 1331 /* 1332 * Let drivers know whether the resource checks are effective 1333 */ 1334 int acpi_resources_are_enforced(void) 1335 { 1336 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1337 } 1338 EXPORT_SYMBOL(acpi_resources_are_enforced); 1339 1340 /* 1341 * Deallocate the memory for a spinlock. 1342 */ 1343 void acpi_os_delete_lock(acpi_spinlock handle) 1344 { 1345 ACPI_FREE(handle); 1346 } 1347 1348 /* 1349 * Acquire a spinlock. 1350 * 1351 * handle is a pointer to the spinlock_t. 1352 */ 1353 1354 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1355 { 1356 acpi_cpu_flags flags; 1357 spin_lock_irqsave(lockp, flags); 1358 return flags; 1359 } 1360 1361 /* 1362 * Release a spinlock. See above. 1363 */ 1364 1365 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1366 { 1367 spin_unlock_irqrestore(lockp, flags); 1368 } 1369 1370 #ifndef ACPI_USE_LOCAL_CACHE 1371 1372 /******************************************************************************* 1373 * 1374 * FUNCTION: acpi_os_create_cache 1375 * 1376 * PARAMETERS: name - Ascii name for the cache 1377 * size - Size of each cached object 1378 * depth - Maximum depth of the cache (in objects) <ignored> 1379 * cache - Where the new cache object is returned 1380 * 1381 * RETURN: status 1382 * 1383 * DESCRIPTION: Create a cache object 1384 * 1385 ******************************************************************************/ 1386 1387 acpi_status 1388 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1389 { 1390 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1391 if (*cache == NULL) 1392 return AE_ERROR; 1393 else 1394 return AE_OK; 1395 } 1396 1397 /******************************************************************************* 1398 * 1399 * FUNCTION: acpi_os_purge_cache 1400 * 1401 * PARAMETERS: Cache - Handle to cache object 1402 * 1403 * RETURN: Status 1404 * 1405 * DESCRIPTION: Free all objects within the requested cache. 1406 * 1407 ******************************************************************************/ 1408 1409 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1410 { 1411 kmem_cache_shrink(cache); 1412 return (AE_OK); 1413 } 1414 1415 /******************************************************************************* 1416 * 1417 * FUNCTION: acpi_os_delete_cache 1418 * 1419 * PARAMETERS: Cache - Handle to cache object 1420 * 1421 * RETURN: Status 1422 * 1423 * DESCRIPTION: Free all objects within the requested cache and delete the 1424 * cache object. 1425 * 1426 ******************************************************************************/ 1427 1428 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1429 { 1430 kmem_cache_destroy(cache); 1431 return (AE_OK); 1432 } 1433 1434 /******************************************************************************* 1435 * 1436 * FUNCTION: acpi_os_release_object 1437 * 1438 * PARAMETERS: Cache - Handle to cache object 1439 * Object - The object to be released 1440 * 1441 * RETURN: None 1442 * 1443 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1444 * the object is deleted. 1445 * 1446 ******************************************************************************/ 1447 1448 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1449 { 1450 kmem_cache_free(cache, object); 1451 return (AE_OK); 1452 } 1453 #endif 1454 1455 acpi_status __init acpi_os_initialize(void) 1456 { 1457 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1458 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1459 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1460 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1461 1462 return AE_OK; 1463 } 1464 1465 acpi_status __init acpi_os_initialize1(void) 1466 { 1467 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1468 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1469 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1); 1470 BUG_ON(!kacpid_wq); 1471 BUG_ON(!kacpi_notify_wq); 1472 BUG_ON(!kacpi_hotplug_wq); 1473 acpi_install_interface_handler(acpi_osi_handler); 1474 acpi_osi_setup_late(); 1475 return AE_OK; 1476 } 1477 1478 acpi_status acpi_os_terminate(void) 1479 { 1480 if (acpi_irq_handler) { 1481 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1482 acpi_irq_handler); 1483 } 1484 1485 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1486 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1487 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1488 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1489 1490 destroy_workqueue(kacpid_wq); 1491 destroy_workqueue(kacpi_notify_wq); 1492 destroy_workqueue(kacpi_hotplug_wq); 1493 1494 return AE_OK; 1495 } 1496