drivers/acpi/osl.c

   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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pci.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kmod.h>
  34 #include <linux/delay.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/nmi.h>
  37 #include <linux/acpi.h>
  38 #include <linux/efi.h>
  39 #include <linux/ioport.h>
  40 #include <linux/list.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/semaphore.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/io-64-nonatomic-lo-hi.h>
  47
  48 #include "internal.h"
  49
  50 #define _COMPONENT              ACPI_OS_SERVICES
  51 ACPI_MODULE_NAME("osl");
  52
  53 struct acpi_os_dpc {
  54         acpi_osd_exec_callback function;
  55         void *context;
  56         struct work_struct work;
  57 };
  58
  59 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  61 #endif
  62
  63 #ifdef ENABLE_DEBUGGER
  64 #include <linux/kdb.h>
  65
  66 /* stuff for debugger support */
  67 int acpi_in_debugger;
  68 EXPORT_SYMBOL(acpi_in_debugger);
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  72                                       u32 pm1b_ctrl);
  73 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  74                                       u32 val_b);
  75
  76 static acpi_osd_handler acpi_irq_handler;
  77 static void *acpi_irq_context;
  78 static struct workqueue_struct *kacpid_wq;
  79 static struct workqueue_struct *kacpi_notify_wq;
  80 static struct workqueue_struct *kacpi_hotplug_wq;
  81 static bool acpi_os_initialized;
  82 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  83
  84 /*
  85  * This list of permanent mappings is for memory that may be accessed from
  86  * interrupt context, where we can't do the ioremap().
  87  */
  88 struct acpi_ioremap {
  89         struct list_head list;
  90         void __iomem *virt;
  91         acpi_physical_address phys;
  92         acpi_size size;
  93         unsigned long refcount;
  94 };
  95
  96 static LIST_HEAD(acpi_ioremaps);
  97 static DEFINE_MUTEX(acpi_ioremap_lock);
  98
  99 static void __init acpi_osi_setup_late(void);
 100
 101 /*
 102  * The story of _OSI(Linux)
 103  *
 104  * From pre-history through Linux-2.6.22,
 105  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 106  *
 107  * Unfortunately, reference BIOS writers got wind of this
 108  * and put OSI(Linux) in their example code, quickly exposing
 109  * this string as ill-conceived and opening the door to
 110  * an un-bounded number of BIOS incompatibilities.
 111  *
 112  * For example, OSI(Linux) was used on resume to re-POST a
 113  * video card on one system, because Linux at that time
 114  * could not do a speedy restore in its native driver.
 115  * But then upon gaining quick native restore capability,
 116  * Linux has no way to tell the BIOS to skip the time-consuming
 117  * POST -- putting Linux at a permanent performance disadvantage.
 118  * On another system, the BIOS writer used OSI(Linux)
 119  * to infer native OS support for IPMI!  On other systems,
 120  * OSI(Linux) simply got in the way of Linux claiming to
 121  * be compatible with other operating systems, exposing
 122  * BIOS issues such as skipped device initialization.
 123  *
 124  * So "Linux" turned out to be a really poor chose of
 125  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 126  *
 127  * BIOS writers should NOT query _OSI(Linux) on future systems.
 128  * Linux will complain on the console when it sees it, and return FALSE.
 129  * To get Linux to return TRUE for your system  will require
 130  * a kernel source update to add a DMI entry,
 131  * or boot with "acpi_osi=Linux"
 132  */
 133
 134 static struct osi_linux {
 135         unsigned int    enable:1;
 136         unsigned int    dmi:1;
 137         unsigned int    cmdline:1;
 138         unsigned int    default_disabling:1;
 139 } osi_linux = {0, 0, 0, 0};
 140
 141 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 142 {
 143         if (!strcmp("Linux", interface)) {
 144
 145                 printk_once(KERN_NOTICE FW_BUG PREFIX
 146                         "BIOS _OSI(Linux) query %s%s\n",
 147                         osi_linux.enable ? "honored" : "ignored",
 148                         osi_linux.cmdline ? " via cmdline" :
 149                         osi_linux.dmi ? " via DMI" : "");
 150         }
 151
 152         if (!strcmp("Darwin", interface)) {
 153                 /*
 154                  * Apple firmware will behave poorly if it receives positive
 155                  * answers to "Darwin" and any other OS. Respond positively
 156                  * to Darwin and then disable all other vendor strings.
 157                  */
 158                 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
 159                 supported = ACPI_UINT32_MAX;
 160         }
 161
 162         return supported;
 163 }
 164
 165 static void __init acpi_request_region (struct acpi_generic_address *gas,
 166         unsigned int length, char *desc)
 167 {
 168         u64 addr;
 169
 170         /* Handle possible alignment issues */
 171         memcpy(&addr, &gas->address, sizeof(addr));
 172         if (!addr || !length)
 173                 return;
 174
 175         /* Resources are never freed */
 176         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 177                 request_region(addr, length, desc);
 178         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 179                 request_mem_region(addr, length, desc);
 180 }
 181
 182 static int __init acpi_reserve_resources(void)
 183 {
 184         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 185                 "ACPI PM1a_EVT_BLK");
 186
 187         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 188                 "ACPI PM1b_EVT_BLK");
 189
 190         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 191                 "ACPI PM1a_CNT_BLK");
 192
 193         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 194                 "ACPI PM1b_CNT_BLK");
 195
 196         if (acpi_gbl_FADT.pm_timer_length == 4)
 197                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 198
 199         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 200                 "ACPI PM2_CNT_BLK");
 201
 202         /* Length of GPE blocks must be a non-negative multiple of 2 */
 203
 204         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 205                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 206                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 207
 208         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 209                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 210                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 211
 212         return 0;
 213 }
 214 fs_initcall_sync(acpi_reserve_resources);
 215
 216 void acpi_os_printf(const char *fmt, ...)
 217 {
 218         va_list args;
 219         va_start(args, fmt);
 220         acpi_os_vprintf(fmt, args);
 221         va_end(args);
 222 }
 223 EXPORT_SYMBOL(acpi_os_printf);
 224
 225 void acpi_os_vprintf(const char *fmt, va_list args)
 226 {
 227         static char buffer[512];
 228
 229         vsprintf(buffer, fmt, args);
 230
 231 #ifdef ENABLE_DEBUGGER
 232         if (acpi_in_debugger) {
 233                 kdb_printf("%s", buffer);
 234         } else {
 235                 printk(KERN_CONT "%s", buffer);
 236         }
 237 #else
 238         if (acpi_debugger_write_log(buffer) < 0)
 239                 printk(KERN_CONT "%s", buffer);
 240 #endif
 241 }
 242
 243 #ifdef CONFIG_KEXEC
 244 static unsigned long acpi_rsdp;
 245 static int __init setup_acpi_rsdp(char *arg)
 246 {
 247         if (kstrtoul(arg, 16, &acpi_rsdp))
 248                 return -EINVAL;
 249         return 0;
 250 }
 251 early_param("acpi_rsdp", setup_acpi_rsdp);
 252 #endif
 253
 254 acpi_physical_address __init acpi_os_get_root_pointer(void)
 255 {
 256 #ifdef CONFIG_KEXEC
 257         if (acpi_rsdp)
 258                 return acpi_rsdp;
 259 #endif
 260
 261         if (efi_enabled(EFI_CONFIG_TABLES)) {
 262                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 263                         return efi.acpi20;
 264                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 265                         return efi.acpi;
 266                 else {
 267                         printk(KERN_ERR PREFIX
 268                                "System description tables not found\n");
 269                         return 0;
 270                 }
 271         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 272                 acpi_physical_address pa = 0;
 273
 274                 acpi_find_root_pointer(&pa);
 275                 return pa;
 276         }
 277
 278         return 0;
 279 }
 280
 281 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 282 static struct acpi_ioremap *
 283 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 284 {
 285         struct acpi_ioremap *map;
 286
 287         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 288                 if (map->phys <= phys &&
 289                     phys + size <= map->phys + map->size)
 290                         return map;
 291
 292         return NULL;
 293 }
 294
 295 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 296 static void __iomem *
 297 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 298 {
 299         struct acpi_ioremap *map;
 300
 301         map = acpi_map_lookup(phys, size);
 302         if (map)
 303                 return map->virt + (phys - map->phys);
 304
 305         return NULL;
 306 }
 307
 308 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 309 {
 310         struct acpi_ioremap *map;
 311         void __iomem *virt = NULL;
 312
 313         mutex_lock(&acpi_ioremap_lock);
 314         map = acpi_map_lookup(phys, size);
 315         if (map) {
 316                 virt = map->virt + (phys - map->phys);
 317                 map->refcount++;
 318         }
 319         mutex_unlock(&acpi_ioremap_lock);
 320         return virt;
 321 }
 322 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 323
 324 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 325 static struct acpi_ioremap *
 326 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 327 {
 328         struct acpi_ioremap *map;
 329
 330         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 331                 if (map->virt <= virt &&
 332                     virt + size <= map->virt + map->size)
 333                         return map;
 334
 335         return NULL;
 336 }
 337
 338 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 339 /* ioremap will take care of cache attributes */
 340 #define should_use_kmap(pfn)   0
 341 #else
 342 #define should_use_kmap(pfn)   page_is_ram(pfn)
 343 #endif
 344
 345 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 346 {
 347         unsigned long pfn;
 348
 349         pfn = pg_off >> PAGE_SHIFT;
 350         if (should_use_kmap(pfn)) {
 351                 if (pg_sz > PAGE_SIZE)
 352                         return NULL;
 353                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 354         } else
 355                 return acpi_os_ioremap(pg_off, pg_sz);
 356 }
 357
 358 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 359 {
 360         unsigned long pfn;
 361
 362         pfn = pg_off >> PAGE_SHIFT;
 363         if (should_use_kmap(pfn))
 364                 kunmap(pfn_to_page(pfn));
 365         else
 366                 iounmap(vaddr);
 367 }
 368
 369 /**
 370  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 371  * @phys: Start of the physical address range to map.
 372  * @size: Size of the physical address range to map.
 373  *
 374  * Look up the given physical address range in the list of existing ACPI memory
 375  * mappings.  If found, get a reference to it and return a pointer to it (its
 376  * virtual address).  If not found, map it, add it to that list and return a
 377  * pointer to it.
 378  *
 379  * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
 380  * routine simply calls __acpi_map_table() to get the job done.
 381  */
 382 void __iomem *__init_refok
 383 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 384 {
 385         struct acpi_ioremap *map;
 386         void __iomem *virt;
 387         acpi_physical_address pg_off;
 388         acpi_size pg_sz;
 389
 390         if (phys > ULONG_MAX) {
 391                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 392                 return NULL;
 393         }
 394
 395         if (!acpi_gbl_permanent_mmap)
 396                 return __acpi_map_table((unsigned long)phys, size);
 397
 398         mutex_lock(&acpi_ioremap_lock);
 399         /* Check if there's a suitable mapping already. */
 400         map = acpi_map_lookup(phys, size);
 401         if (map) {
 402                 map->refcount++;
 403                 goto out;
 404         }
 405
 406         map = kzalloc(sizeof(*map), GFP_KERNEL);
 407         if (!map) {
 408                 mutex_unlock(&acpi_ioremap_lock);
 409                 return NULL;
 410         }
 411
 412         pg_off = round_down(phys, PAGE_SIZE);
 413         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 414         virt = acpi_map(pg_off, pg_sz);
 415         if (!virt) {
 416                 mutex_unlock(&acpi_ioremap_lock);
 417                 kfree(map);
 418                 return NULL;
 419         }
 420
 421         INIT_LIST_HEAD(&map->list);
 422         map->virt = virt;
 423         map->phys = pg_off;
 424         map->size = pg_sz;
 425         map->refcount = 1;
 426
 427         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 428
 429 out:
 430         mutex_unlock(&acpi_ioremap_lock);
 431         return map->virt + (phys - map->phys);
 432 }
 433 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 434
 435 void *__init_refok
 436 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 437 {
 438         return (void *)acpi_os_map_iomem(phys, size);
 439 }
 440 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 441
 442 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 443 {
 444         if (!--map->refcount)
 445                 list_del_rcu(&map->list);
 446 }
 447
 448 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 449 {
 450         if (!map->refcount) {
 451                 synchronize_rcu_expedited();
 452                 acpi_unmap(map->phys, map->virt);
 453                 kfree(map);
 454         }
 455 }
 456
 457 /**
 458  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 459  * @virt: Start of the address range to drop a reference to.
 460  * @size: Size of the address range to drop a reference to.
 461  *
 462  * Look up the given virtual address range in the list of existing ACPI memory
 463  * mappings, drop a reference to it and unmap it if there are no more active
 464  * references to it.
 465  *
 466  * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
 467  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 468  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 469  * here.
 470  */
 471 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 472 {
 473         struct acpi_ioremap *map;
 474
 475         if (!acpi_gbl_permanent_mmap) {
 476                 __acpi_unmap_table(virt, size);
 477                 return;
 478         }
 479
 480         mutex_lock(&acpi_ioremap_lock);
 481         map = acpi_map_lookup_virt(virt, size);
 482         if (!map) {
 483                 mutex_unlock(&acpi_ioremap_lock);
 484                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 485                 return;
 486         }
 487         acpi_os_drop_map_ref(map);
 488         mutex_unlock(&acpi_ioremap_lock);
 489
 490         acpi_os_map_cleanup(map);
 491 }
 492 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 493
 494 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 495 {
 496         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 497 }
 498 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 499
 500 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 501 {
 502         if (!acpi_gbl_permanent_mmap)
 503                 __acpi_unmap_table(virt, size);
 504 }
 505
 506 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 507 {
 508         u64 addr;
 509         void __iomem *virt;
 510
 511         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 512                 return 0;
 513
 514         /* Handle possible alignment issues */
 515         memcpy(&addr, &gas->address, sizeof(addr));
 516         if (!addr || !gas->bit_width)
 517                 return -EINVAL;
 518
 519         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 520         if (!virt)
 521                 return -EIO;
 522
 523         return 0;
 524 }
 525 EXPORT_SYMBOL(acpi_os_map_generic_address);
 526
 527 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 528 {
 529         u64 addr;
 530         struct acpi_ioremap *map;
 531
 532         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 533                 return;
 534
 535         /* Handle possible alignment issues */
 536         memcpy(&addr, &gas->address, sizeof(addr));
 537         if (!addr || !gas->bit_width)
 538                 return;
 539
 540         mutex_lock(&acpi_ioremap_lock);
 541         map = acpi_map_lookup(addr, gas->bit_width / 8);
 542         if (!map) {
 543                 mutex_unlock(&acpi_ioremap_lock);
 544                 return;
 545         }
 546         acpi_os_drop_map_ref(map);
 547         mutex_unlock(&acpi_ioremap_lock);
 548
 549         acpi_os_map_cleanup(map);
 550 }
 551 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 552
 553 #ifdef ACPI_FUTURE_USAGE
 554 acpi_status
 555 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 556 {
 557         if (!phys || !virt)
 558                 return AE_BAD_PARAMETER;
 559
 560         *phys = virt_to_phys(virt);
 561
 562         return AE_OK;
 563 }
 564 #endif
 565
 566 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 567 static bool acpi_rev_override;
 568
 569 int __init acpi_rev_override_setup(char *str)
 570 {
 571         acpi_rev_override = true;
 572         return 1;
 573 }
 574 __setup("acpi_rev_override", acpi_rev_override_setup);
 575 #else
 576 #define acpi_rev_override       false
 577 #endif
 578
 579 #define ACPI_MAX_OVERRIDE_LEN 100
 580
 581 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 582
 583 acpi_status
 584 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 585                             char **new_val)
 586 {
 587         if (!init_val || !new_val)
 588                 return AE_BAD_PARAMETER;
 589
 590         *new_val = NULL;
 591         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 592                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 593                        acpi_os_name);
 594                 *new_val = acpi_os_name;
 595         }
 596
 597         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 598                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 599                 *new_val = (char *)5;
 600         }
 601
 602         return AE_OK;
 603 }
 604
 605 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 606 #include <linux/earlycpio.h>
 607 #include <linux/memblock.h>
 608
 609 static u64 acpi_tables_addr;
 610 static int all_tables_size;
 611
 612 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 613 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 614 {
 615         u8 sum = 0;
 616         u8 *end = buffer + length;
 617
 618         while (buffer < end)
 619                 sum = (u8) (sum + *(buffer++));
 620         return sum;
 621 }
 622
 623 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 624 static const char * const table_sigs[] = {
 625         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 626         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 627         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 628         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 629         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 630         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 631         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 632         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 633         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 634
 635 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 636
 637 #define ACPI_OVERRIDE_TABLES 64
 638 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 639
 640 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 641
 642 void __init acpi_initrd_override(void *data, size_t size)
 643 {
 644         int sig, no, table_nr = 0, total_offset = 0;
 645         long offset = 0;
 646         struct acpi_table_header *table;
 647         char cpio_path[32] = "kernel/firmware/acpi/";
 648         struct cpio_data file;
 649
 650         if (data == NULL || size == 0)
 651                 return;
 652
 653         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 654                 file = find_cpio_data(cpio_path, data, size, &offset);
 655                 if (!file.data)
 656                         break;
 657
 658                 data += offset;
 659                 size -= offset;
 660
 661                 if (file.size < sizeof(struct acpi_table_header)) {
 662                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 663                                 cpio_path, file.name);
 664                         continue;
 665                 }
 666
 667                 table = file.data;
 668
 669                 for (sig = 0; table_sigs[sig]; sig++)
 670                         if (!memcmp(table->signature, table_sigs[sig], 4))
 671                                 break;
 672
 673                 if (!table_sigs[sig]) {
 674                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 675                                 cpio_path, file.name);
 676                         continue;
 677                 }
 678                 if (file.size != table->length) {
 679                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 680                                 cpio_path, file.name);
 681                         continue;
 682                 }
 683                 if (acpi_table_checksum(file.data, table->length)) {
 684                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 685                                 cpio_path, file.name);
 686                         continue;
 687                 }
 688
 689                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 690                         table->signature, cpio_path, file.name, table->length);
 691
 692                 all_tables_size += table->length;
 693                 acpi_initrd_files[table_nr].data = file.data;
 694                 acpi_initrd_files[table_nr].size = file.size;
 695                 table_nr++;
 696         }
 697         if (table_nr == 0)
 698                 return;
 699
 700         acpi_tables_addr =
 701                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 702                                        all_tables_size, PAGE_SIZE);
 703         if (!acpi_tables_addr) {
 704                 WARN_ON(1);
 705                 return;
 706         }
 707         /*
 708          * Only calling e820_add_reserve does not work and the
 709          * tables are invalid (memory got used) later.
 710          * memblock_reserve works as expected and the tables won't get modified.
 711          * But it's not enough on X86 because ioremap will
 712          * complain later (used by acpi_os_map_memory) that the pages
 713          * that should get mapped are not marked "reserved".
 714          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 715          * works fine.
 716          */
 717         memblock_reserve(acpi_tables_addr, all_tables_size);
 718         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 719
 720         /*
 721          * early_ioremap only can remap 256k one time. If we map all
 722          * tables one time, we will hit the limit. Need to map chunks
 723          * one by one during copying the same as that in relocate_initrd().
 724          */
 725         for (no = 0; no < table_nr; no++) {
 726                 unsigned char *src_p = acpi_initrd_files[no].data;
 727                 phys_addr_t size = acpi_initrd_files[no].size;
 728                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 729                 phys_addr_t slop, clen;
 730                 char *dest_p;
 731
 732                 total_offset += size;
 733
 734                 while (size) {
 735                         slop = dest_addr & ~PAGE_MASK;
 736                         clen = size;
 737                         if (clen > MAP_CHUNK_SIZE - slop)
 738                                 clen = MAP_CHUNK_SIZE - slop;
 739                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 740                                                  clen + slop);
 741                         memcpy(dest_p + slop, src_p, clen);
 742                         early_iounmap(dest_p, clen + slop);
 743                         src_p += clen;
 744                         dest_addr += clen;
 745                         size -= clen;
 746                 }
 747         }
 748 }
 749 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 750
 751 static void acpi_table_taint(struct acpi_table_header *table)
 752 {
 753         pr_warn(PREFIX
 754                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 755                 table->signature, table->oem_table_id);
 756         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 757 }
 758
 759
 760 acpi_status
 761 acpi_os_table_override(struct acpi_table_header * existing_table,
 762                        struct acpi_table_header ** new_table)
 763 {
 764         if (!existing_table || !new_table)
 765                 return AE_BAD_PARAMETER;
 766
 767         *new_table = NULL;
 768
 769 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 770         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 771                 *new_table = (struct acpi_table_header *)AmlCode;
 772 #endif
 773         if (*new_table != NULL)
 774                 acpi_table_taint(existing_table);
 775         return AE_OK;
 776 }
 777
 778 acpi_status
 779 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 780                                 acpi_physical_address *address,
 781                                 u32 *table_length)
 782 {
 783 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 784         *table_length = 0;
 785         *address = 0;
 786         return AE_OK;
 787 #else
 788         int table_offset = 0;
 789         struct acpi_table_header *table;
 790
 791         *table_length = 0;
 792         *address = 0;
 793
 794         if (!acpi_tables_addr)
 795                 return AE_OK;
 796
 797         do {
 798                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 799                         WARN_ON(1);
 800                         return AE_OK;
 801                 }
 802
 803                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 804                                            ACPI_HEADER_SIZE);
 805
 806                 if (table_offset + table->length > all_tables_size) {
 807                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 808                         WARN_ON(1);
 809                         return AE_OK;
 810                 }
 811
 812                 table_offset += table->length;
 813
 814                 if (memcmp(existing_table->signature, table->signature, 4)) {
 815                         acpi_os_unmap_memory(table,
 816                                      ACPI_HEADER_SIZE);
 817                         continue;
 818                 }
 819
 820                 /* Only override tables with matching oem id */
 821                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 822                            ACPI_OEM_TABLE_ID_SIZE)) {
 823                         acpi_os_unmap_memory(table,
 824                                      ACPI_HEADER_SIZE);
 825                         continue;
 826                 }
 827
 828                 table_offset -= table->length;
 829                 *table_length = table->length;
 830                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 831                 *address = acpi_tables_addr + table_offset;
 832                 break;
 833         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 834
 835         if (*address != 0)
 836                 acpi_table_taint(existing_table);
 837         return AE_OK;
 838 #endif
 839 }
 840
 841 static irqreturn_t acpi_irq(int irq, void *dev_id)
 842 {
 843         u32 handled;
 844
 845         handled = (*acpi_irq_handler) (acpi_irq_context);
 846
 847         if (handled) {
 848                 acpi_irq_handled++;
 849                 return IRQ_HANDLED;
 850         } else {
 851                 acpi_irq_not_handled++;
 852                 return IRQ_NONE;
 853         }
 854 }
 855
 856 acpi_status
 857 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 858                                   void *context)
 859 {
 860         unsigned int irq;
 861
 862         acpi_irq_stats_init();
 863
 864         /*
 865          * ACPI interrupts different from the SCI in our copy of the FADT are
 866          * not supported.
 867          */
 868         if (gsi != acpi_gbl_FADT.sci_interrupt)
 869                 return AE_BAD_PARAMETER;
 870
 871         if (acpi_irq_handler)
 872                 return AE_ALREADY_ACQUIRED;
 873
 874         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 875                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 876                        gsi);
 877                 return AE_OK;
 878         }
 879
 880         acpi_irq_handler = handler;
 881         acpi_irq_context = context;
 882         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 883                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 884                 acpi_irq_handler = NULL;
 885                 return AE_NOT_ACQUIRED;
 886         }
 887         acpi_sci_irq = irq;
 888
 889         return AE_OK;
 890 }
 891
 892 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 893 {
 894         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 895                 return AE_BAD_PARAMETER;
 896
 897         free_irq(acpi_sci_irq, acpi_irq);
 898         acpi_irq_handler = NULL;
 899         acpi_sci_irq = INVALID_ACPI_IRQ;
 900
 901         return AE_OK;
 902 }
 903
 904 /*
 905  * Running in interpreter thread context, safe to sleep
 906  */
 907
 908 void acpi_os_sleep(u64 ms)
 909 {
 910         msleep(ms);
 911 }
 912
 913 void acpi_os_stall(u32 us)
 914 {
 915         while (us) {
 916                 u32 delay = 1000;
 917
 918                 if (delay > us)
 919                         delay = us;
 920                 udelay(delay);
 921                 touch_nmi_watchdog();
 922                 us -= delay;
 923         }
 924 }
 925
 926 /*
 927  * Support ACPI 3.0 AML Timer operand
 928  * Returns 64-bit free-running, monotonically increasing timer
 929  * with 100ns granularity
 930  */
 931 u64 acpi_os_get_timer(void)
 932 {
 933         u64 time_ns = ktime_to_ns(ktime_get());
 934         do_div(time_ns, 100);
 935         return time_ns;
 936 }
 937
 938 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 939 {
 940         u32 dummy;
 941
 942         if (!value)
 943                 value = &dummy;
 944
 945         *value = 0;
 946         if (width <= 8) {
 947                 *(u8 *) value = inb(port);
 948         } else if (width <= 16) {
 949                 *(u16 *) value = inw(port);
 950         } else if (width <= 32) {
 951                 *(u32 *) value = inl(port);
 952         } else {
 953                 BUG();
 954         }
 955
 956         return AE_OK;
 957 }
 958
 959 EXPORT_SYMBOL(acpi_os_read_port);
 960
 961 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 962 {
 963         if (width <= 8) {
 964                 outb(value, port);
 965         } else if (width <= 16) {
 966                 outw(value, port);
 967         } else if (width <= 32) {
 968                 outl(value, port);
 969         } else {
 970                 BUG();
 971         }
 972
 973         return AE_OK;
 974 }
 975
 976 EXPORT_SYMBOL(acpi_os_write_port);
 977
 978 acpi_status
 979 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 980 {
 981         void __iomem *virt_addr;
 982         unsigned int size = width / 8;
 983         bool unmap = false;
 984         u64 dummy;
 985
 986         rcu_read_lock();
 987         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 988         if (!virt_addr) {
 989                 rcu_read_unlock();
 990                 virt_addr = acpi_os_ioremap(phys_addr, size);
 991                 if (!virt_addr)
 992                         return AE_BAD_ADDRESS;
 993                 unmap = true;
 994         }
 995
 996         if (!value)
 997                 value = &dummy;
 998
 999         switch (width) {
1000         case 8:
1001                 *(u8 *) value = readb(virt_addr);
1002                 break;
1003         case 16:
1004                 *(u16 *) value = readw(virt_addr);
1005                 break;
1006         case 32:
1007                 *(u32 *) value = readl(virt_addr);
1008                 break;
1009         case 64:
1010                 *(u64 *) value = readq(virt_addr);
1011                 break;
1012         default:
1013                 BUG();
1014         }
1015
1016         if (unmap)
1017                 iounmap(virt_addr);
1018         else
1019                 rcu_read_unlock();
1020
1021         return AE_OK;
1022 }
1023
1024 acpi_status
1025 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1026 {
1027         void __iomem *virt_addr;
1028         unsigned int size = width / 8;
1029         bool unmap = false;
1030
1031         rcu_read_lock();
1032         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1033         if (!virt_addr) {
1034                 rcu_read_unlock();
1035                 virt_addr = acpi_os_ioremap(phys_addr, size);
1036                 if (!virt_addr)
1037                         return AE_BAD_ADDRESS;
1038                 unmap = true;
1039         }
1040
1041         switch (width) {
1042         case 8:
1043                 writeb(value, virt_addr);
1044                 break;
1045         case 16:
1046                 writew(value, virt_addr);
1047                 break;
1048         case 32:
1049                 writel(value, virt_addr);
1050                 break;
1051         case 64:
1052                 writeq(value, virt_addr);
1053                 break;
1054         default:
1055                 BUG();
1056         }
1057
1058         if (unmap)
1059                 iounmap(virt_addr);
1060         else
1061                 rcu_read_unlock();
1062
1063         return AE_OK;
1064 }
1065
1066 acpi_status
1067 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1068                                u64 *value, u32 width)
1069 {
1070         int result, size;
1071         u32 value32;
1072
1073         if (!value)
1074                 return AE_BAD_PARAMETER;
1075
1076         switch (width) {
1077         case 8:
1078                 size = 1;
1079                 break;
1080         case 16:
1081                 size = 2;
1082                 break;
1083         case 32:
1084                 size = 4;
1085                 break;
1086         default:
1087                 return AE_ERROR;
1088         }
1089
1090         result = raw_pci_read(pci_id->segment, pci_id->bus,
1091                                 PCI_DEVFN(pci_id->device, pci_id->function),
1092                                 reg, size, &value32);
1093         *value = value32;
1094
1095         return (result ? AE_ERROR : AE_OK);
1096 }
1097
1098 acpi_status
1099 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1100                                 u64 value, u32 width)
1101 {
1102         int result, size;
1103
1104         switch (width) {
1105         case 8:
1106                 size = 1;
1107                 break;
1108         case 16:
1109                 size = 2;
1110                 break;
1111         case 32:
1112                 size = 4;
1113                 break;
1114         default:
1115                 return AE_ERROR;
1116         }
1117
1118         result = raw_pci_write(pci_id->segment, pci_id->bus,
1119                                 PCI_DEVFN(pci_id->device, pci_id->function),
1120                                 reg, size, value);
1121
1122         return (result ? AE_ERROR : AE_OK);
1123 }
1124
1125 static void acpi_os_execute_deferred(struct work_struct *work)
1126 {
1127         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1128
1129         dpc->function(dpc->context);
1130         kfree(dpc);
1131 }
1132
1133 #ifdef CONFIG_ACPI_DEBUGGER
1134 static struct acpi_debugger acpi_debugger;
1135 static bool acpi_debugger_initialized;
1136
1137 int acpi_register_debugger(struct module *owner,
1138                            const struct acpi_debugger_ops *ops)
1139 {
1140         int ret = 0;
1141
1142         mutex_lock(&acpi_debugger.lock);
1143         if (acpi_debugger.ops) {
1144                 ret = -EBUSY;
1145                 goto err_lock;
1146         }
1147
1148         acpi_debugger.owner = owner;
1149         acpi_debugger.ops = ops;
1150
1151 err_lock:
1152         mutex_unlock(&acpi_debugger.lock);
1153         return ret;
1154 }
1155 EXPORT_SYMBOL(acpi_register_debugger);
1156
1157 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
1158 {
1159         mutex_lock(&acpi_debugger.lock);
1160         if (ops == acpi_debugger.ops) {
1161                 acpi_debugger.ops = NULL;
1162                 acpi_debugger.owner = NULL;
1163         }
1164         mutex_unlock(&acpi_debugger.lock);
1165 }
1166 EXPORT_SYMBOL(acpi_unregister_debugger);
1167
1168 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
1169 {
1170         int ret;
1171         int (*func)(acpi_osd_exec_callback, void *);
1172         struct module *owner;
1173
1174         if (!acpi_debugger_initialized)
1175                 return -ENODEV;
1176         mutex_lock(&acpi_debugger.lock);
1177         if (!acpi_debugger.ops) {
1178                 ret = -ENODEV;
1179                 goto err_lock;
1180         }
1181         if (!try_module_get(acpi_debugger.owner)) {
1182                 ret = -ENODEV;
1183                 goto err_lock;
1184         }
1185         func = acpi_debugger.ops->create_thread;
1186         owner = acpi_debugger.owner;
1187         mutex_unlock(&acpi_debugger.lock);
1188
1189         ret = func(function, context);
1190
1191         mutex_lock(&acpi_debugger.lock);
1192         module_put(owner);
1193 err_lock:
1194         mutex_unlock(&acpi_debugger.lock);
1195         return ret;
1196 }
1197
1198 ssize_t acpi_debugger_write_log(const char *msg)
1199 {
1200         ssize_t ret;
1201         ssize_t (*func)(const char *);
1202         struct module *owner;
1203
1204         if (!acpi_debugger_initialized)
1205                 return -ENODEV;
1206         mutex_lock(&acpi_debugger.lock);
1207         if (!acpi_debugger.ops) {
1208                 ret = -ENODEV;
1209                 goto err_lock;
1210         }
1211         if (!try_module_get(acpi_debugger.owner)) {
1212                 ret = -ENODEV;
1213                 goto err_lock;
1214         }
1215         func = acpi_debugger.ops->write_log;
1216         owner = acpi_debugger.owner;
1217         mutex_unlock(&acpi_debugger.lock);
1218
1219         ret = func(msg);
1220
1221         mutex_lock(&acpi_debugger.lock);
1222         module_put(owner);
1223 err_lock:
1224         mutex_unlock(&acpi_debugger.lock);
1225         return ret;
1226 }
1227
1228 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
1229 {
1230         ssize_t ret;
1231         ssize_t (*func)(char *, size_t);
1232         struct module *owner;
1233
1234         if (!acpi_debugger_initialized)
1235                 return -ENODEV;
1236         mutex_lock(&acpi_debugger.lock);
1237         if (!acpi_debugger.ops) {
1238                 ret = -ENODEV;
1239                 goto err_lock;
1240         }
1241         if (!try_module_get(acpi_debugger.owner)) {
1242                 ret = -ENODEV;
1243                 goto err_lock;
1244         }
1245         func = acpi_debugger.ops->read_cmd;
1246         owner = acpi_debugger.owner;
1247         mutex_unlock(&acpi_debugger.lock);
1248
1249         ret = func(buffer, buffer_length);
1250
1251         mutex_lock(&acpi_debugger.lock);
1252         module_put(owner);
1253 err_lock:
1254         mutex_unlock(&acpi_debugger.lock);
1255         return ret;
1256 }
1257
1258 int acpi_debugger_wait_command_ready(void)
1259 {
1260         int ret;
1261         int (*func)(bool, char *, size_t);
1262         struct module *owner;
1263
1264         if (!acpi_debugger_initialized)
1265                 return -ENODEV;
1266         mutex_lock(&acpi_debugger.lock);
1267         if (!acpi_debugger.ops) {
1268                 ret = -ENODEV;
1269                 goto err_lock;
1270         }
1271         if (!try_module_get(acpi_debugger.owner)) {
1272                 ret = -ENODEV;
1273                 goto err_lock;
1274         }
1275         func = acpi_debugger.ops->wait_command_ready;
1276         owner = acpi_debugger.owner;
1277         mutex_unlock(&acpi_debugger.lock);
1278
1279         ret = func(acpi_gbl_method_executing,
1280                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1281
1282         mutex_lock(&acpi_debugger.lock);
1283         module_put(owner);
1284 err_lock:
1285         mutex_unlock(&acpi_debugger.lock);
1286         return ret;
1287 }
1288
1289 int acpi_debugger_notify_command_complete(void)
1290 {
1291         int ret;
1292         int (*func)(void);
1293         struct module *owner;
1294
1295         if (!acpi_debugger_initialized)
1296                 return -ENODEV;
1297         mutex_lock(&acpi_debugger.lock);
1298         if (!acpi_debugger.ops) {
1299                 ret = -ENODEV;
1300                 goto err_lock;
1301         }
1302         if (!try_module_get(acpi_debugger.owner)) {
1303                 ret = -ENODEV;
1304                 goto err_lock;
1305         }
1306         func = acpi_debugger.ops->notify_command_complete;
1307         owner = acpi_debugger.owner;
1308         mutex_unlock(&acpi_debugger.lock);
1309
1310         ret = func();
1311
1312         mutex_lock(&acpi_debugger.lock);
1313         module_put(owner);
1314 err_lock:
1315         mutex_unlock(&acpi_debugger.lock);
1316         return ret;
1317 }
1318
1319 int __init acpi_debugger_init(void)
1320 {
1321         mutex_init(&acpi_debugger.lock);
1322         acpi_debugger_initialized = true;
1323         return 0;
1324 }
1325 #endif
1326
1327 /*******************************************************************************
1328  *
1329  * FUNCTION:    acpi_os_execute
1330  *
1331  * PARAMETERS:  Type               - Type of the callback
1332  *              Function           - Function to be executed
1333  *              Context            - Function parameters
1334  *
1335  * RETURN:      Status
1336  *
1337  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1338  *              immediately executes function on a separate thread.
1339  *
1340  ******************************************************************************/
1341
1342 acpi_status acpi_os_execute(acpi_execute_type type,
1343                             acpi_osd_exec_callback function, void *context)
1344 {
1345         acpi_status status = AE_OK;
1346         struct acpi_os_dpc *dpc;
1347         struct workqueue_struct *queue;
1348         int ret;
1349         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1350                           "Scheduling function [%p(%p)] for deferred execution.\n",
1351                           function, context));
1352
1353         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1354                 ret = acpi_debugger_create_thread(function, context);
1355                 if (ret) {
1356                         pr_err("Call to kthread_create() failed.\n");
1357                         status = AE_ERROR;
1358                 }
1359                 goto out_thread;
1360         }
1361
1362         /*
1363          * Allocate/initialize DPC structure.  Note that this memory will be
1364          * freed by the callee.  The kernel handles the work_struct list  in a
1365          * way that allows us to also free its memory inside the callee.
1366          * Because we may want to schedule several tasks with different
1367          * parameters we can't use the approach some kernel code uses of
1368          * having a static work_struct.
1369          */
1370
1371         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1372         if (!dpc)
1373                 return AE_NO_MEMORY;
1374
1375         dpc->function = function;
1376         dpc->context = context;
1377
1378         /*
1379          * To prevent lockdep from complaining unnecessarily, make sure that
1380          * there is a different static lockdep key for each workqueue by using
1381          * INIT_WORK() for each of them separately.
1382          */
1383         if (type == OSL_NOTIFY_HANDLER) {
1384                 queue = kacpi_notify_wq;
1385                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1386         } else if (type == OSL_GPE_HANDLER) {
1387                 queue = kacpid_wq;
1388                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1389         } else {
1390                 pr_err("Unsupported os_execute type %d.\n", type);
1391                 status = AE_ERROR;
1392         }
1393
1394         if (ACPI_FAILURE(status))
1395                 goto err_workqueue;
1396
1397         /*
1398          * On some machines, a software-initiated SMI causes corruption unless
1399          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1400          * typically it's done in GPE-related methods that are run via
1401          * workqueues, so we can avoid the known corruption cases by always
1402          * queueing on CPU 0.
1403          */
1404         ret = queue_work_on(0, queue, &dpc->work);
1405         if (!ret) {
1406                 printk(KERN_ERR PREFIX
1407                           "Call to queue_work() failed.\n");
1408                 status = AE_ERROR;
1409         }
1410 err_workqueue:
1411         if (ACPI_FAILURE(status))
1412                 kfree(dpc);
1413 out_thread:
1414         return status;
1415 }
1416 EXPORT_SYMBOL(acpi_os_execute);
1417
1418 void acpi_os_wait_events_complete(void)
1419 {
1420         /*
1421          * Make sure the GPE handler or the fixed event handler is not used
1422          * on another CPU after removal.
1423          */
1424         if (acpi_sci_irq_valid())
1425                 synchronize_hardirq(acpi_sci_irq);
1426         flush_workqueue(kacpid_wq);
1427         flush_workqueue(kacpi_notify_wq);
1428 }
1429
1430 struct acpi_hp_work {
1431         struct work_struct work;
1432         struct acpi_device *adev;
1433         u32 src;
1434 };
1435
1436 static void acpi_hotplug_work_fn(struct work_struct *work)
1437 {
1438         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1439
1440         acpi_os_wait_events_complete();
1441         acpi_device_hotplug(hpw->adev, hpw->src);
1442         kfree(hpw);
1443 }
1444
1445 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1446 {
1447         struct acpi_hp_work *hpw;
1448
1449         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1450                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1451                   adev, src));
1452
1453         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1454         if (!hpw)
1455                 return AE_NO_MEMORY;
1456
1457         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1458         hpw->adev = adev;
1459         hpw->src = src;
1460         /*
1461          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1462          * the hotplug code may call driver .remove() functions, which may
1463          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1464          * these workqueues.
1465          */
1466         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1467                 kfree(hpw);
1468                 return AE_ERROR;
1469         }
1470         return AE_OK;
1471 }
1472
1473 bool acpi_queue_hotplug_work(struct work_struct *work)
1474 {
1475         return queue_work(kacpi_hotplug_wq, work);
1476 }
1477
1478 acpi_status
1479 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1480 {
1481         struct semaphore *sem = NULL;
1482
1483         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1484         if (!sem)
1485                 return AE_NO_MEMORY;
1486
1487         sema_init(sem, initial_units);
1488
1489         *handle = (acpi_handle *) sem;
1490
1491         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1492                           *handle, initial_units));
1493
1494         return AE_OK;
1495 }
1496
1497 /*
1498  * TODO: A better way to delete semaphores?  Linux doesn't have a
1499  * 'delete_semaphore()' function -- may result in an invalid
1500  * pointer dereference for non-synchronized consumers.  Should
1501  * we at least check for blocked threads and signal/cancel them?
1502  */
1503
1504 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1505 {
1506         struct semaphore *sem = (struct semaphore *)handle;
1507
1508         if (!sem)
1509                 return AE_BAD_PARAMETER;
1510
1511         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1512
1513         BUG_ON(!list_empty(&sem->wait_list));
1514         kfree(sem);
1515         sem = NULL;
1516
1517         return AE_OK;
1518 }
1519
1520 /*
1521  * TODO: Support for units > 1?
1522  */
1523 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1524 {
1525         acpi_status status = AE_OK;
1526         struct semaphore *sem = (struct semaphore *)handle;
1527         long jiffies;
1528         int ret = 0;
1529
1530         if (!acpi_os_initialized)
1531                 return AE_OK;
1532
1533         if (!sem || (units < 1))
1534                 return AE_BAD_PARAMETER;
1535
1536         if (units > 1)
1537                 return AE_SUPPORT;
1538
1539         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1540                           handle, units, timeout));
1541
1542         if (timeout == ACPI_WAIT_FOREVER)
1543                 jiffies = MAX_SCHEDULE_TIMEOUT;
1544         else
1545                 jiffies = msecs_to_jiffies(timeout);
1546
1547         ret = down_timeout(sem, jiffies);
1548         if (ret)
1549                 status = AE_TIME;
1550
1551         if (ACPI_FAILURE(status)) {
1552                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1553                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1554                                   handle, units, timeout,
1555                                   acpi_format_exception(status)));
1556         } else {
1557                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1558                                   "Acquired semaphore[%p|%d|%d]", handle,
1559                                   units, timeout));
1560         }
1561
1562         return status;
1563 }
1564
1565 /*
1566  * TODO: Support for units > 1?
1567  */
1568 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1569 {
1570         struct semaphore *sem = (struct semaphore *)handle;
1571
1572         if (!acpi_os_initialized)
1573                 return AE_OK;
1574
1575         if (!sem || (units < 1))
1576                 return AE_BAD_PARAMETER;
1577
1578         if (units > 1)
1579                 return AE_SUPPORT;
1580
1581         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1582                           units));
1583
1584         up(sem);
1585
1586         return AE_OK;
1587 }
1588
1589 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1590 {
1591 #ifdef ENABLE_DEBUGGER
1592         if (acpi_in_debugger) {
1593                 u32 chars;
1594
1595                 kdb_read(buffer, buffer_length);
1596
1597                 /* remove the CR kdb includes */
1598                 chars = strlen(buffer) - 1;
1599                 buffer[chars] = '\0';
1600         }
1601 #else
1602         int ret;
1603
1604         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1605         if (ret < 0)
1606                 return AE_ERROR;
1607         if (bytes_read)
1608                 *bytes_read = ret;
1609 #endif
1610
1611         return AE_OK;
1612 }
1613 EXPORT_SYMBOL(acpi_os_get_line);
1614
1615 acpi_status acpi_os_wait_command_ready(void)
1616 {
1617         int ret;
1618
1619         ret = acpi_debugger_wait_command_ready();
1620         if (ret < 0)
1621                 return AE_ERROR;
1622         return AE_OK;
1623 }
1624
1625 acpi_status acpi_os_notify_command_complete(void)
1626 {
1627         int ret;
1628
1629         ret = acpi_debugger_notify_command_complete();
1630         if (ret < 0)
1631                 return AE_ERROR;
1632         return AE_OK;
1633 }
1634
1635 acpi_status acpi_os_signal(u32 function, void *info)
1636 {
1637         switch (function) {
1638         case ACPI_SIGNAL_FATAL:
1639                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1640                 break;
1641         case ACPI_SIGNAL_BREAKPOINT:
1642                 /*
1643                  * AML Breakpoint
1644                  * ACPI spec. says to treat it as a NOP unless
1645                  * you are debugging.  So if/when we integrate
1646                  * AML debugger into the kernel debugger its
1647                  * hook will go here.  But until then it is
1648                  * not useful to print anything on breakpoints.
1649                  */
1650                 break;
1651         default:
1652                 break;
1653         }
1654
1655         return AE_OK;
1656 }
1657
1658 static int __init acpi_os_name_setup(char *str)
1659 {
1660         char *p = acpi_os_name;
1661         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1662
1663         if (!str || !*str)
1664                 return 0;
1665
1666         for (; count-- && *str; str++) {
1667                 if (isalnum(*str) || *str == ' ' || *str == ':')
1668                         *p++ = *str;
1669                 else if (*str == '\'' || *str == '"')
1670                         continue;
1671                 else
1672                         break;
1673         }
1674         *p = 0;
1675
1676         return 1;
1677
1678 }
1679
1680 __setup("acpi_os_name=", acpi_os_name_setup);
1681
1682 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1683 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1684
1685 struct osi_setup_entry {
1686         char string[OSI_STRING_LENGTH_MAX];
1687         bool enable;
1688 };
1689
1690 static struct osi_setup_entry
1691                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1692         {"Module Device", true},
1693         {"Processor Device", true},
1694         {"3.0 _SCP Extensions", true},
1695         {"Processor Aggregator Device", true},
1696 };
1697
1698 void __init acpi_osi_setup(char *str)
1699 {
1700         struct osi_setup_entry *osi;
1701         bool enable = true;
1702         int i;
1703
1704         if (!acpi_gbl_create_osi_method)
1705                 return;
1706
1707         if (str == NULL || *str == '\0') {
1708                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1709                 acpi_gbl_create_osi_method = FALSE;
1710                 return;
1711         }
1712
1713         if (*str == '!') {
1714                 str++;
1715                 if (*str == '\0') {
1716                         osi_linux.default_disabling = 1;
1717                         return;
1718                 } else if (*str == '*') {
1719                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1720                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1721                                 osi = &osi_setup_entries[i];
1722                                 osi->enable = false;
1723                         }
1724                         return;
1725                 }
1726                 enable = false;
1727         }
1728
1729         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1730                 osi = &osi_setup_entries[i];
1731                 if (!strcmp(osi->string, str)) {
1732                         osi->enable = enable;
1733                         break;
1734                 } else if (osi->string[0] == '\0') {
1735                         osi->enable = enable;
1736                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1737                         break;
1738                 }
1739         }
1740 }
1741
1742 static void __init set_osi_linux(unsigned int enable)
1743 {
1744         if (osi_linux.enable != enable)
1745                 osi_linux.enable = enable;
1746
1747         if (osi_linux.enable)
1748                 acpi_osi_setup("Linux");
1749         else
1750                 acpi_osi_setup("!Linux");
1751
1752         return;
1753 }
1754
1755 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1756 {
1757         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1758         osi_linux.dmi = 0;
1759         set_osi_linux(enable);
1760
1761         return;
1762 }
1763
1764 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1765 {
1766         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1767
1768         if (enable == -1)
1769                 return;
1770
1771         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1772         set_osi_linux(enable);
1773
1774         return;
1775 }
1776
1777 /*
1778  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1779  *
1780  * empty string disables _OSI
1781  * string starting with '!' disables that string
1782  * otherwise string is added to list, augmenting built-in strings
1783  */
1784 static void __init acpi_osi_setup_late(void)
1785 {
1786         struct osi_setup_entry *osi;
1787         char *str;
1788         int i;
1789         acpi_status status;
1790
1791         if (osi_linux.default_disabling) {
1792                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1793
1794                 if (ACPI_SUCCESS(status))
1795                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1796         }
1797
1798         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1799                 osi = &osi_setup_entries[i];
1800                 str = osi->string;
1801
1802                 if (*str == '\0')
1803                         break;
1804                 if (osi->enable) {
1805                         status = acpi_install_interface(str);
1806
1807                         if (ACPI_SUCCESS(status))
1808                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1809                 } else {
1810                         status = acpi_remove_interface(str);
1811
1812                         if (ACPI_SUCCESS(status))
1813                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1814                 }
1815         }
1816 }
1817
1818 static int __init osi_setup(char *str)
1819 {
1820         if (str && !strcmp("Linux", str))
1821                 acpi_cmdline_osi_linux(1);
1822         else if (str && !strcmp("!Linux", str))
1823                 acpi_cmdline_osi_linux(0);
1824         else
1825                 acpi_osi_setup(str);
1826
1827         return 1;
1828 }
1829
1830 __setup("acpi_osi=", osi_setup);
1831
1832 /*
1833  * Disable the auto-serialization of named objects creation methods.
1834  *
1835  * This feature is enabled by default.  It marks the AML control methods
1836  * that contain the opcodes to create named objects as "Serialized".
1837  */
1838 static int __init acpi_no_auto_serialize_setup(char *str)
1839 {
1840         acpi_gbl_auto_serialize_methods = FALSE;
1841         pr_info("ACPI: auto-serialization disabled\n");
1842
1843         return 1;
1844 }
1845
1846 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1847
1848 /* Check of resource interference between native drivers and ACPI
1849  * OperationRegions (SystemIO and System Memory only).
1850  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1851  * in arbitrary AML code and can interfere with legacy drivers.
1852  * acpi_enforce_resources= can be set to:
1853  *
1854  *   - strict (default) (2)
1855  *     -> further driver trying to access the resources will not load
1856  *   - lax              (1)
1857  *     -> further driver trying to access the resources will load, but you
1858  *     get a system message that something might go wrong...
1859  *
1860  *   - no               (0)
1861  *     -> ACPI Operation Region resources will not be registered
1862  *
1863  */
1864 #define ENFORCE_RESOURCES_STRICT 2
1865 #define ENFORCE_RESOURCES_LAX    1
1866 #define ENFORCE_RESOURCES_NO     0
1867
1868 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1869
1870 static int __init acpi_enforce_resources_setup(char *str)
1871 {
1872         if (str == NULL || *str == '\0')
1873                 return 0;
1874
1875         if (!strcmp("strict", str))
1876                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1877         else if (!strcmp("lax", str))
1878                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1879         else if (!strcmp("no", str))
1880                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1881
1882         return 1;
1883 }
1884
1885 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1886
1887 /* Check for resource conflicts between ACPI OperationRegions and native
1888  * drivers */
1889 int acpi_check_resource_conflict(const struct resource *res)
1890 {
1891         acpi_adr_space_type space_id;
1892         acpi_size length;
1893         u8 warn = 0;
1894         int clash = 0;
1895
1896         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1897                 return 0;
1898         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1899                 return 0;
1900
1901         if (res->flags & IORESOURCE_IO)
1902                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1903         else
1904                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1905
1906         length = resource_size(res);
1907         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1908                 warn = 1;
1909         clash = acpi_check_address_range(space_id, res->start, length, warn);
1910
1911         if (clash) {
1912                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1913                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1914                                 printk(KERN_NOTICE "ACPI: This conflict may"
1915                                        " cause random problems and system"
1916                                        " instability\n");
1917                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1918                                " for this device, you should use it instead of"
1919                                " the native driver\n");
1920                 }
1921                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1922                         return -EBUSY;
1923         }
1924         return 0;
1925 }
1926 EXPORT_SYMBOL(acpi_check_resource_conflict);
1927
1928 int acpi_check_region(resource_size_t start, resource_size_t n,
1929                       const char *name)
1930 {
1931         struct resource res = {
1932                 .start = start,
1933                 .end   = start + n - 1,
1934                 .name  = name,
1935                 .flags = IORESOURCE_IO,
1936         };
1937
1938         return acpi_check_resource_conflict(&res);
1939 }
1940 EXPORT_SYMBOL(acpi_check_region);
1941
1942 /*
1943  * Let drivers know whether the resource checks are effective
1944  */
1945 int acpi_resources_are_enforced(void)
1946 {
1947         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1948 }
1949 EXPORT_SYMBOL(acpi_resources_are_enforced);
1950
1951 bool acpi_osi_is_win8(void)
1952 {
1953         return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
1954 }
1955 EXPORT_SYMBOL(acpi_osi_is_win8);
1956
1957 /*
1958  * Deallocate the memory for a spinlock.
1959  */
1960 void acpi_os_delete_lock(acpi_spinlock handle)
1961 {
1962         ACPI_FREE(handle);
1963 }
1964
1965 /*
1966  * Acquire a spinlock.
1967  *
1968  * handle is a pointer to the spinlock_t.
1969  */
1970
1971 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1972 {
1973         acpi_cpu_flags flags;
1974         spin_lock_irqsave(lockp, flags);
1975         return flags;
1976 }
1977
1978 /*
1979  * Release a spinlock. See above.
1980  */
1981
1982 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1983 {
1984         spin_unlock_irqrestore(lockp, flags);
1985 }
1986
1987 #ifndef ACPI_USE_LOCAL_CACHE
1988
1989 /*******************************************************************************
1990  *
1991  * FUNCTION:    acpi_os_create_cache
1992  *
1993  * PARAMETERS:  name      - Ascii name for the cache
1994  *              size      - Size of each cached object
1995  *              depth     - Maximum depth of the cache (in objects) <ignored>
1996  *              cache     - Where the new cache object is returned
1997  *
1998  * RETURN:      status
1999  *
2000  * DESCRIPTION: Create a cache object
2001  *
2002  ******************************************************************************/
2003
2004 acpi_status
2005 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
2006 {
2007         *cache = kmem_cache_create(name, size, 0, 0, NULL);
2008         if (*cache == NULL)
2009                 return AE_ERROR;
2010         else
2011                 return AE_OK;
2012 }
2013
2014 /*******************************************************************************
2015  *
2016  * FUNCTION:    acpi_os_purge_cache
2017  *
2018  * PARAMETERS:  Cache           - Handle to cache object
2019  *
2020  * RETURN:      Status
2021  *
2022  * DESCRIPTION: Free all objects within the requested cache.
2023  *
2024  ******************************************************************************/
2025
2026 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
2027 {
2028         kmem_cache_shrink(cache);
2029         return (AE_OK);
2030 }
2031
2032 /*******************************************************************************
2033  *
2034  * FUNCTION:    acpi_os_delete_cache
2035  *
2036  * PARAMETERS:  Cache           - Handle to cache object
2037  *
2038  * RETURN:      Status
2039  *
2040  * DESCRIPTION: Free all objects within the requested cache and delete the
2041  *              cache object.
2042  *
2043  ******************************************************************************/
2044
2045 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
2046 {
2047         kmem_cache_destroy(cache);
2048         return (AE_OK);
2049 }
2050
2051 /*******************************************************************************
2052  *
2053  * FUNCTION:    acpi_os_release_object
2054  *
2055  * PARAMETERS:  Cache       - Handle to cache object
2056  *              Object      - The object to be released
2057  *
2058  * RETURN:      None
2059  *
2060  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
2061  *              the object is deleted.
2062  *
2063  ******************************************************************************/
2064
2065 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
2066 {
2067         kmem_cache_free(cache, object);
2068         return (AE_OK);
2069 }
2070 #endif
2071
2072 static int __init acpi_no_static_ssdt_setup(char *s)
2073 {
2074         acpi_gbl_disable_ssdt_table_install = TRUE;
2075         pr_info("ACPI: static SSDT installation disabled\n");
2076
2077         return 0;
2078 }
2079
2080 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
2081
2082 static int __init acpi_disable_return_repair(char *s)
2083 {
2084         printk(KERN_NOTICE PREFIX
2085                "ACPI: Predefined validation mechanism disabled\n");
2086         acpi_gbl_disable_auto_repair = TRUE;
2087
2088         return 1;
2089 }
2090
2091 __setup("acpica_no_return_repair", acpi_disable_return_repair);
2092
2093 acpi_status __init acpi_os_initialize(void)
2094 {
2095         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
2096         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
2097         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
2098         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
2099         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
2100                 /*
2101                  * Use acpi_os_map_generic_address to pre-map the reset
2102                  * register if it's in system memory.
2103                  */
2104                 int rv;
2105
2106                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
2107                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
2108         }
2109         acpi_os_initialized = true;
2110
2111         return AE_OK;
2112 }
2113
2114 acpi_status __init acpi_os_initialize1(void)
2115 {
2116         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
2117         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
2118         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
2119         BUG_ON(!kacpid_wq);
2120         BUG_ON(!kacpi_notify_wq);
2121         BUG_ON(!kacpi_hotplug_wq);
2122         acpi_install_interface_handler(acpi_osi_handler);
2123         acpi_osi_setup_late();
2124         return AE_OK;
2125 }
2126
2127 acpi_status acpi_os_terminate(void)
2128 {
2129         if (acpi_irq_handler) {
2130                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
2131                                                  acpi_irq_handler);
2132         }
2133
2134         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
2135         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
2136         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
2137         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
2138         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
2139                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
2140
2141         destroy_workqueue(kacpid_wq);
2142         destroy_workqueue(kacpi_notify_wq);
2143         destroy_workqueue(kacpi_hotplug_wq);
2144
2145         return AE_OK;
2146 }
2147
2148 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
2149                                   u32 pm1b_control)
2150 {
2151         int rc = 0;
2152         if (__acpi_os_prepare_sleep)
2153                 rc = __acpi_os_prepare_sleep(sleep_state,
2154                                              pm1a_control, pm1b_control);
2155         if (rc < 0)
2156                 return AE_ERROR;
2157         else if (rc > 0)
2158                 return AE_CTRL_SKIP;
2159
2160         return AE_OK;
2161 }
2162
2163 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
2164                                u32 pm1a_ctrl, u32 pm1b_ctrl))
2165 {
2166         __acpi_os_prepare_sleep = func;
2167 }
2168
2169 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
2170                                   u32 val_b)
2171 {
2172         int rc = 0;
2173         if (__acpi_os_prepare_extended_sleep)
2174                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
2175                                              val_a, val_b);
2176         if (rc < 0)
2177                 return AE_ERROR;
2178         else if (rc > 0)
2179                 return AE_CTRL_SKIP;
2180
2181         return AE_OK;
2182 }
2183
2184 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
2185                                u32 val_a, u32 val_b))
2186 {
2187         __acpi_os_prepare_extended_sleep = func;
2188 }