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 <[email protected]>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <[email protected]>
   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/efi.h>
  42 #include <linux/ioport.h>
  43 #include <linux/list.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/semaphore.h>
  46
  47 #include <asm/io.h>
  48 #include <asm/uaccess.h>
  49
  50 #include <acpi/acpi.h>
  51 #include <acpi/acpi_bus.h>
  52 #include <acpi/processor.h>
  53
  54 #define _COMPONENT              ACPI_OS_SERVICES
  55 ACPI_MODULE_NAME("osl");
  56 #define PREFIX          "ACPI: "
  57 struct acpi_os_dpc {
  58         acpi_osd_exec_callback function;
  59         void *context;
  60         struct work_struct work;
  61         int wait;
  62 };
  63
  64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  66 #endif
  67
  68 #ifdef ENABLE_DEBUGGER
  69 #include <linux/kdb.h>
  70
  71 /* stuff for debugger support */
  72 int acpi_in_debugger;
  73 EXPORT_SYMBOL(acpi_in_debugger);
  74
  75 extern char line_buf[80];
  76 #endif                          /*ENABLE_DEBUGGER */
  77
  78 static unsigned int acpi_irq_irq;
  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 static struct workqueue_struct *kacpi_hotplug_wq;
  84
  85 struct acpi_res_list {
  86         resource_size_t start;
  87         resource_size_t end;
  88         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  89         char name[5];   /* only can have a length of 4 chars, make use of this
  90                            one instead of res->name, no need to kalloc then */
  91         struct list_head resource_list;
  92         int count;
  93 };
  94
  95 static LIST_HEAD(resource_list_head);
  96 static DEFINE_SPINLOCK(acpi_res_lock);
  97
  98 /*
  99  * This list of permanent mappings is for memory that may be accessed from
 100  * interrupt context, where we can't do the ioremap().
 101  */
 102 struct acpi_ioremap {
 103         struct list_head list;
 104         void __iomem *virt;
 105         acpi_physical_address phys;
 106         acpi_size size;
 107 };
 108
 109 static LIST_HEAD(acpi_ioremaps);
 110 static DEFINE_SPINLOCK(acpi_ioremap_lock);
 111
 112 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
 113 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
 114
 115 /*
 116  * The story of _OSI(Linux)
 117  *
 118  * From pre-history through Linux-2.6.22,
 119  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 120  *
 121  * Unfortunately, reference BIOS writers got wind of this
 122  * and put OSI(Linux) in their example code, quickly exposing
 123  * this string as ill-conceived and opening the door to
 124  * an un-bounded number of BIOS incompatibilities.
 125  *
 126  * For example, OSI(Linux) was used on resume to re-POST a
 127  * video card on one system, because Linux at that time
 128  * could not do a speedy restore in its native driver.
 129  * But then upon gaining quick native restore capability,
 130  * Linux has no way to tell the BIOS to skip the time-consuming
 131  * POST -- putting Linux at a permanent performance disadvantage.
 132  * On another system, the BIOS writer used OSI(Linux)
 133  * to infer native OS support for IPMI!  On other systems,
 134  * OSI(Linux) simply got in the way of Linux claiming to
 135  * be compatible with other operating systems, exposing
 136  * BIOS issues such as skipped device initialization.
 137  *
 138  * So "Linux" turned out to be a really poor chose of
 139  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 140  *
 141  * BIOS writers should NOT query _OSI(Linux) on future systems.
 142  * Linux will complain on the console when it sees it, and return FALSE.
 143  * To get Linux to return TRUE for your system  will require
 144  * a kernel source update to add a DMI entry,
 145  * or boot with "acpi_osi=Linux"
 146  */
 147
 148 static struct osi_linux {
 149         unsigned int    enable:1;
 150         unsigned int    dmi:1;
 151         unsigned int    cmdline:1;
 152         unsigned int    known:1;
 153 } osi_linux = { 0, 0, 0, 0};
 154
 155 static void __init acpi_request_region (struct acpi_generic_address *addr,
 156         unsigned int length, char *desc)
 157 {
 158         if (!addr->address || !length)
 159                 return;
 160
 161         /* Resources are never freed */
 162         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 163                 request_region(addr->address, length, desc);
 164         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 165                 request_mem_region(addr->address, length, desc);
 166 }
 167
 168 static int __init acpi_reserve_resources(void)
 169 {
 170         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 171                 "ACPI PM1a_EVT_BLK");
 172
 173         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 174                 "ACPI PM1b_EVT_BLK");
 175
 176         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 177                 "ACPI PM1a_CNT_BLK");
 178
 179         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 180                 "ACPI PM1b_CNT_BLK");
 181
 182         if (acpi_gbl_FADT.pm_timer_length == 4)
 183                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 184
 185         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 186                 "ACPI PM2_CNT_BLK");
 187
 188         /* Length of GPE blocks must be a non-negative multiple of 2 */
 189
 190         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 191                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 192                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 193
 194         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 195                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 196                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 197
 198         return 0;
 199 }
 200 device_initcall(acpi_reserve_resources);
 201
 202 void acpi_os_printf(const char *fmt, ...)
 203 {
 204         va_list args;
 205         va_start(args, fmt);
 206         acpi_os_vprintf(fmt, args);
 207         va_end(args);
 208 }
 209
 210 void acpi_os_vprintf(const char *fmt, va_list args)
 211 {
 212         static char buffer[512];
 213
 214         vsprintf(buffer, fmt, args);
 215
 216 #ifdef ENABLE_DEBUGGER
 217         if (acpi_in_debugger) {
 218                 kdb_printf("%s", buffer);
 219         } else {
 220                 printk(KERN_CONT "%s", buffer);
 221         }
 222 #else
 223         printk(KERN_CONT "%s", buffer);
 224 #endif
 225 }
 226
 227 acpi_physical_address __init acpi_os_get_root_pointer(void)
 228 {
 229         if (efi_enabled) {
 230                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 231                         return efi.acpi20;
 232                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 233                         return efi.acpi;
 234                 else {
 235                         printk(KERN_ERR PREFIX
 236                                "System description tables not found\n");
 237                         return 0;
 238                 }
 239         } else {
 240                 acpi_physical_address pa = 0;
 241
 242                 acpi_find_root_pointer(&pa);
 243                 return pa;
 244         }
 245 }
 246
 247 /* Must be called with 'acpi_ioremap_lock' lock held. */
 248 static void __iomem *
 249 acpi_map_vaddr_lookup(acpi_physical_address phys, acpi_size size)
 250 {
 251         struct acpi_ioremap *map;
 252
 253         list_for_each_entry(map, &acpi_ioremaps, list)
 254                 if (map->phys <= phys &&
 255                     phys + size <= map->phys + map->size)
 256                         return map->virt + (phys - map->phys);
 257
 258         return NULL;
 259 }
 260
 261 /* Must be called with 'acpi_ioremap_lock' lock held. */
 262 static struct acpi_ioremap *
 263 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 264 {
 265         struct acpi_ioremap *map;
 266
 267         list_for_each_entry(map, &acpi_ioremaps, list)
 268                 if (map->virt == virt && map->size == size)
 269                         return map;
 270
 271         return NULL;
 272 }
 273
 274 void __iomem *__init_refok
 275 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 276 {
 277         struct acpi_ioremap *map;
 278         unsigned long flags;
 279         void __iomem *virt;
 280
 281         if (phys > ULONG_MAX) {
 282                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 283                 return NULL;
 284         }
 285
 286         if (!acpi_gbl_permanent_mmap)
 287                 return __acpi_map_table((unsigned long)phys, size);
 288
 289         map = kzalloc(sizeof(*map), GFP_KERNEL);
 290         if (!map)
 291                 return NULL;
 292
 293         virt = ioremap(phys, size);
 294         if (!virt) {
 295                 kfree(map);
 296                 return NULL;
 297         }
 298
 299         INIT_LIST_HEAD(&map->list);
 300         map->virt = virt;
 301         map->phys = phys;
 302         map->size = size;
 303
 304         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 305         list_add_tail(&map->list, &acpi_ioremaps);
 306         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 307
 308         return virt;
 309 }
 310 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 311
 312 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 313 {
 314         struct acpi_ioremap *map;
 315         unsigned long flags;
 316
 317         if (!acpi_gbl_permanent_mmap) {
 318                 __acpi_unmap_table(virt, size);
 319                 return;
 320         }
 321
 322         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 323         map = acpi_map_lookup_virt(virt, size);
 324         if (!map) {
 325                 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 326                 printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt);
 327                 dump_stack();
 328                 return;
 329         }
 330
 331         list_del(&map->list);
 332         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 333
 334         iounmap(map->virt);
 335         kfree(map);
 336 }
 337 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 338
 339 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 340 {
 341         if (!acpi_gbl_permanent_mmap)
 342                 __acpi_unmap_table(virt, size);
 343 }
 344
 345 int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 346 {
 347         void __iomem *virt;
 348
 349         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 350                 return 0;
 351
 352         if (!addr->address || !addr->bit_width)
 353                 return -EINVAL;
 354
 355         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 356         if (!virt)
 357                 return -EIO;
 358
 359         return 0;
 360 }
 361 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address);
 362
 363 void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 364 {
 365         void __iomem *virt;
 366         unsigned long flags;
 367         acpi_size size = addr->bit_width / 8;
 368
 369         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 370                 return;
 371
 372         if (!addr->address || !addr->bit_width)
 373                 return;
 374
 375         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 376         virt = acpi_map_vaddr_lookup(addr->address, size);
 377         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 378
 379         acpi_os_unmap_memory(virt, size);
 380 }
 381 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address);
 382
 383 #ifdef ACPI_FUTURE_USAGE
 384 acpi_status
 385 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 386 {
 387         if (!phys || !virt)
 388                 return AE_BAD_PARAMETER;
 389
 390         *phys = virt_to_phys(virt);
 391
 392         return AE_OK;
 393 }
 394 #endif
 395
 396 #define ACPI_MAX_OVERRIDE_LEN 100
 397
 398 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 399
 400 acpi_status
 401 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 402                             acpi_string * new_val)
 403 {
 404         if (!init_val || !new_val)
 405                 return AE_BAD_PARAMETER;
 406
 407         *new_val = NULL;
 408         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 409                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 410                        acpi_os_name);
 411                 *new_val = acpi_os_name;
 412         }
 413
 414         return AE_OK;
 415 }
 416
 417 acpi_status
 418 acpi_os_table_override(struct acpi_table_header * existing_table,
 419                        struct acpi_table_header ** new_table)
 420 {
 421         if (!existing_table || !new_table)
 422                 return AE_BAD_PARAMETER;
 423
 424         *new_table = NULL;
 425
 426 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 427         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 428                 *new_table = (struct acpi_table_header *)AmlCode;
 429 #endif
 430         if (*new_table != NULL) {
 431                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 432                            "this is unsafe: tainting kernel\n",
 433                        existing_table->signature,
 434                        existing_table->oem_table_id);
 435                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 436         }
 437         return AE_OK;
 438 }
 439
 440 static irqreturn_t acpi_irq(int irq, void *dev_id)
 441 {
 442         u32 handled;
 443
 444         handled = (*acpi_irq_handler) (acpi_irq_context);
 445
 446         if (handled) {
 447                 acpi_irq_handled++;
 448                 return IRQ_HANDLED;
 449         } else {
 450                 acpi_irq_not_handled++;
 451                 return IRQ_NONE;
 452         }
 453 }
 454
 455 acpi_status
 456 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 457                                   void *context)
 458 {
 459         unsigned int irq;
 460
 461         acpi_irq_stats_init();
 462
 463         /*
 464          * Ignore the GSI from the core, and use the value in our copy of the
 465          * FADT. It may not be the same if an interrupt source override exists
 466          * for the SCI.
 467          */
 468         gsi = acpi_gbl_FADT.sci_interrupt;
 469         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 470                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 471                        gsi);
 472                 return AE_OK;
 473         }
 474
 475         acpi_irq_handler = handler;
 476         acpi_irq_context = context;
 477         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 478                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 479                 return AE_NOT_ACQUIRED;
 480         }
 481         acpi_irq_irq = irq;
 482
 483         return AE_OK;
 484 }
 485
 486 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 487 {
 488         if (irq) {
 489                 free_irq(irq, acpi_irq);
 490                 acpi_irq_handler = NULL;
 491                 acpi_irq_irq = 0;
 492         }
 493
 494         return AE_OK;
 495 }
 496
 497 /*
 498  * Running in interpreter thread context, safe to sleep
 499  */
 500
 501 void acpi_os_sleep(u64 ms)
 502 {
 503         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 504 }
 505
 506 void acpi_os_stall(u32 us)
 507 {
 508         while (us) {
 509                 u32 delay = 1000;
 510
 511                 if (delay > us)
 512                         delay = us;
 513                 udelay(delay);
 514                 touch_nmi_watchdog();
 515                 us -= delay;
 516         }
 517 }
 518
 519 /*
 520  * Support ACPI 3.0 AML Timer operand
 521  * Returns 64-bit free-running, monotonically increasing timer
 522  * with 100ns granularity
 523  */
 524 u64 acpi_os_get_timer(void)
 525 {
 526         static u64 t;
 527
 528 #ifdef  CONFIG_HPET
 529         /* TBD: use HPET if available */
 530 #endif
 531
 532 #ifdef  CONFIG_X86_PM_TIMER
 533         /* TBD: default to PM timer if HPET was not available */
 534 #endif
 535         if (!t)
 536                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 537
 538         return ++t;
 539 }
 540
 541 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 542 {
 543         u32 dummy;
 544
 545         if (!value)
 546                 value = &dummy;
 547
 548         *value = 0;
 549         if (width <= 8) {
 550                 *(u8 *) value = inb(port);
 551         } else if (width <= 16) {
 552                 *(u16 *) value = inw(port);
 553         } else if (width <= 32) {
 554                 *(u32 *) value = inl(port);
 555         } else {
 556                 BUG();
 557         }
 558
 559         return AE_OK;
 560 }
 561
 562 EXPORT_SYMBOL(acpi_os_read_port);
 563
 564 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 565 {
 566         if (width <= 8) {
 567                 outb(value, port);
 568         } else if (width <= 16) {
 569                 outw(value, port);
 570         } else if (width <= 32) {
 571                 outl(value, port);
 572         } else {
 573                 BUG();
 574         }
 575
 576         return AE_OK;
 577 }
 578
 579 EXPORT_SYMBOL(acpi_os_write_port);
 580
 581 acpi_status
 582 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 583 {
 584         u32 dummy;
 585         void __iomem *virt_addr;
 586         int size = width / 8, unmap = 0;
 587         unsigned long flags;
 588
 589         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 590         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 591         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 592         if (!virt_addr) {
 593                 virt_addr = ioremap(phys_addr, size);
 594                 unmap = 1;
 595         }
 596         if (!value)
 597                 value = &dummy;
 598
 599         switch (width) {
 600         case 8:
 601                 *(u8 *) value = readb(virt_addr);
 602                 break;
 603         case 16:
 604                 *(u16 *) value = readw(virt_addr);
 605                 break;
 606         case 32:
 607                 *(u32 *) value = readl(virt_addr);
 608                 break;
 609         default:
 610                 BUG();
 611         }
 612
 613         if (unmap)
 614                 iounmap(virt_addr);
 615
 616         return AE_OK;
 617 }
 618
 619 acpi_status
 620 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 621 {
 622         void __iomem *virt_addr;
 623         int size = width / 8, unmap = 0;
 624         unsigned long flags;
 625
 626         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 627         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 628         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 629         if (!virt_addr) {
 630                 virt_addr = ioremap(phys_addr, size);
 631                 unmap = 1;
 632         }
 633
 634         switch (width) {
 635         case 8:
 636                 writeb(value, virt_addr);
 637                 break;
 638         case 16:
 639                 writew(value, virt_addr);
 640                 break;
 641         case 32:
 642                 writel(value, virt_addr);
 643                 break;
 644         default:
 645                 BUG();
 646         }
 647
 648         if (unmap)
 649                 iounmap(virt_addr);
 650
 651         return AE_OK;
 652 }
 653
 654 acpi_status
 655 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 656                                u32 *value, u32 width)
 657 {
 658         int result, size;
 659
 660         if (!value)
 661                 return AE_BAD_PARAMETER;
 662
 663         switch (width) {
 664         case 8:
 665                 size = 1;
 666                 break;
 667         case 16:
 668                 size = 2;
 669                 break;
 670         case 32:
 671                 size = 4;
 672                 break;
 673         default:
 674                 return AE_ERROR;
 675         }
 676
 677         result = raw_pci_read(pci_id->segment, pci_id->bus,
 678                                 PCI_DEVFN(pci_id->device, pci_id->function),
 679                                 reg, size, value);
 680
 681         return (result ? AE_ERROR : AE_OK);
 682 }
 683
 684 acpi_status
 685 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 686                                 u64 value, u32 width)
 687 {
 688         int result, size;
 689
 690         switch (width) {
 691         case 8:
 692                 size = 1;
 693                 break;
 694         case 16:
 695                 size = 2;
 696                 break;
 697         case 32:
 698                 size = 4;
 699                 break;
 700         default:
 701                 return AE_ERROR;
 702         }
 703
 704         result = raw_pci_write(pci_id->segment, pci_id->bus,
 705                                 PCI_DEVFN(pci_id->device, pci_id->function),
 706                                 reg, size, value);
 707
 708         return (result ? AE_ERROR : AE_OK);
 709 }
 710
 711 /* TODO: Change code to take advantage of driver model more */
 712 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 713                                     acpi_handle chandle,        /* current node */
 714                                     struct acpi_pci_id **id,
 715                                     int *is_bridge, u8 * bus_number)
 716 {
 717         acpi_handle handle;
 718         struct acpi_pci_id *pci_id = *id;
 719         acpi_status status;
 720         unsigned long long temp;
 721         acpi_object_type type;
 722
 723         acpi_get_parent(chandle, &handle);
 724         if (handle != rhandle) {
 725                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 726                                         bus_number);
 727
 728                 status = acpi_get_type(handle, &type);
 729                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 730                         return;
 731
 732                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 733                                           &temp);
 734                 if (ACPI_SUCCESS(status)) {
 735                         u32 val;
 736                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 737                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 738
 739                         if (*is_bridge)
 740                                 pci_id->bus = *bus_number;
 741
 742                         /* any nicer way to get bus number of bridge ? */
 743                         status =
 744                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 745                                                            8);
 746                         if (ACPI_SUCCESS(status)
 747                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 748                                 status =
 749                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 750                                                                    &val, 8);
 751                                 if (!ACPI_SUCCESS(status)) {
 752                                         /* Certainly broken...  FIX ME */
 753                                         return;
 754                                 }
 755                                 *is_bridge = 1;
 756                                 pci_id->bus = val;
 757                                 status =
 758                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 759                                                                    &val, 8);
 760                                 if (ACPI_SUCCESS(status)) {
 761                                         *bus_number = val;
 762                                 }
 763                         } else
 764                                 *is_bridge = 0;
 765                 }
 766         }
 767 }
 768
 769 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 770                            acpi_handle chandle, /* current node */
 771                            struct acpi_pci_id **id)
 772 {
 773         int is_bridge = 1;
 774         u8 bus_number = (*id)->bus;
 775
 776         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 777 }
 778
 779 static void acpi_os_execute_deferred(struct work_struct *work)
 780 {
 781         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 782
 783         if (dpc->wait)
 784                 acpi_os_wait_events_complete(NULL);
 785
 786         dpc->function(dpc->context);
 787         kfree(dpc);
 788 }
 789
 790 /*******************************************************************************
 791  *
 792  * FUNCTION:    acpi_os_execute
 793  *
 794  * PARAMETERS:  Type               - Type of the callback
 795  *              Function           - Function to be executed
 796  *              Context            - Function parameters
 797  *
 798  * RETURN:      Status
 799  *
 800  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 801  *              immediately executes function on a separate thread.
 802  *
 803  ******************************************************************************/
 804
 805 static acpi_status __acpi_os_execute(acpi_execute_type type,
 806         acpi_osd_exec_callback function, void *context, int hp)
 807 {
 808         acpi_status status = AE_OK;
 809         struct acpi_os_dpc *dpc;
 810         struct workqueue_struct *queue;
 811         int ret;
 812         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 813                           "Scheduling function [%p(%p)] for deferred execution.\n",
 814                           function, context));
 815
 816         /*
 817          * Allocate/initialize DPC structure.  Note that this memory will be
 818          * freed by the callee.  The kernel handles the work_struct list  in a
 819          * way that allows us to also free its memory inside the callee.
 820          * Because we may want to schedule several tasks with different
 821          * parameters we can't use the approach some kernel code uses of
 822          * having a static work_struct.
 823          */
 824
 825         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 826         if (!dpc)
 827                 return AE_NO_MEMORY;
 828
 829         dpc->function = function;
 830         dpc->context = context;
 831
 832         /*
 833          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 834          * because the hotplug code may call driver .remove() functions,
 835          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 836          * to flush these workqueues.
 837          */
 838         queue = hp ? kacpi_hotplug_wq :
 839                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 840         dpc->wait = hp ? 1 : 0;
 841
 842         if (queue == kacpi_hotplug_wq)
 843                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 844         else if (queue == kacpi_notify_wq)
 845                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 846         else
 847                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 848
 849         /*
 850          * On some machines, a software-initiated SMI causes corruption unless
 851          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 852          * typically it's done in GPE-related methods that are run via
 853          * workqueues, so we can avoid the known corruption cases by always
 854          * queueing on CPU 0.
 855          */
 856         ret = queue_work_on(0, queue, &dpc->work);
 857
 858         if (!ret) {
 859                 printk(KERN_ERR PREFIX
 860                           "Call to queue_work() failed.\n");
 861                 status = AE_ERROR;
 862                 kfree(dpc);
 863         }
 864         return status;
 865 }
 866
 867 acpi_status acpi_os_execute(acpi_execute_type type,
 868                             acpi_osd_exec_callback function, void *context)
 869 {
 870         return __acpi_os_execute(type, function, context, 0);
 871 }
 872 EXPORT_SYMBOL(acpi_os_execute);
 873
 874 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 875         void *context)
 876 {
 877         return __acpi_os_execute(0, function, context, 1);
 878 }
 879
 880 void acpi_os_wait_events_complete(void *context)
 881 {
 882         flush_workqueue(kacpid_wq);
 883         flush_workqueue(kacpi_notify_wq);
 884 }
 885
 886 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 887
 888 /*
 889  * Allocate the memory for a spinlock and initialize it.
 890  */
 891 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 892 {
 893         spin_lock_init(*handle);
 894
 895         return AE_OK;
 896 }
 897
 898 /*
 899  * Deallocate the memory for a spinlock.
 900  */
 901 void acpi_os_delete_lock(acpi_spinlock handle)
 902 {
 903         return;
 904 }
 905
 906 acpi_status
 907 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 908 {
 909         struct semaphore *sem = NULL;
 910
 911         sem = acpi_os_allocate(sizeof(struct semaphore));
 912         if (!sem)
 913                 return AE_NO_MEMORY;
 914         memset(sem, 0, sizeof(struct semaphore));
 915
 916         sema_init(sem, initial_units);
 917
 918         *handle = (acpi_handle *) sem;
 919
 920         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 921                           *handle, initial_units));
 922
 923         return AE_OK;
 924 }
 925
 926 /*
 927  * TODO: A better way to delete semaphores?  Linux doesn't have a
 928  * 'delete_semaphore()' function -- may result in an invalid
 929  * pointer dereference for non-synchronized consumers.  Should
 930  * we at least check for blocked threads and signal/cancel them?
 931  */
 932
 933 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 934 {
 935         struct semaphore *sem = (struct semaphore *)handle;
 936
 937         if (!sem)
 938                 return AE_BAD_PARAMETER;
 939
 940         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 941
 942         BUG_ON(!list_empty(&sem->wait_list));
 943         kfree(sem);
 944         sem = NULL;
 945
 946         return AE_OK;
 947 }
 948
 949 /*
 950  * TODO: Support for units > 1?
 951  */
 952 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 953 {
 954         acpi_status status = AE_OK;
 955         struct semaphore *sem = (struct semaphore *)handle;
 956         long jiffies;
 957         int ret = 0;
 958
 959         if (!sem || (units < 1))
 960                 return AE_BAD_PARAMETER;
 961
 962         if (units > 1)
 963                 return AE_SUPPORT;
 964
 965         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 966                           handle, units, timeout));
 967
 968         if (timeout == ACPI_WAIT_FOREVER)
 969                 jiffies = MAX_SCHEDULE_TIMEOUT;
 970         else
 971                 jiffies = msecs_to_jiffies(timeout);
 972
 973         ret = down_timeout(sem, jiffies);
 974         if (ret)
 975                 status = AE_TIME;
 976
 977         if (ACPI_FAILURE(status)) {
 978                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 979                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 980                                   handle, units, timeout,
 981                                   acpi_format_exception(status)));
 982         } else {
 983                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 984                                   "Acquired semaphore[%p|%d|%d]", handle,
 985                                   units, timeout));
 986         }
 987
 988         return status;
 989 }
 990
 991 /*
 992  * TODO: Support for units > 1?
 993  */
 994 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 995 {
 996         struct semaphore *sem = (struct semaphore *)handle;
 997
 998         if (!sem || (units < 1))
 999                 return AE_BAD_PARAMETER;
1000
1001         if (units > 1)
1002                 return AE_SUPPORT;
1003
1004         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1005                           units));
1006
1007         up(sem);
1008
1009         return AE_OK;
1010 }
1011
1012 #ifdef ACPI_FUTURE_USAGE
1013 u32 acpi_os_get_line(char *buffer)
1014 {
1015
1016 #ifdef ENABLE_DEBUGGER
1017         if (acpi_in_debugger) {
1018                 u32 chars;
1019
1020                 kdb_read(buffer, sizeof(line_buf));
1021
1022                 /* remove the CR kdb includes */
1023                 chars = strlen(buffer) - 1;
1024                 buffer[chars] = '\0';
1025         }
1026 #endif
1027
1028         return 0;
1029 }
1030 #endif                          /*  ACPI_FUTURE_USAGE  */
1031
1032 acpi_status acpi_os_signal(u32 function, void *info)
1033 {
1034         switch (function) {
1035         case ACPI_SIGNAL_FATAL:
1036                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1037                 break;
1038         case ACPI_SIGNAL_BREAKPOINT:
1039                 /*
1040                  * AML Breakpoint
1041                  * ACPI spec. says to treat it as a NOP unless
1042                  * you are debugging.  So if/when we integrate
1043                  * AML debugger into the kernel debugger its
1044                  * hook will go here.  But until then it is
1045                  * not useful to print anything on breakpoints.
1046                  */
1047                 break;
1048         default:
1049                 break;
1050         }
1051
1052         return AE_OK;
1053 }
1054
1055 static int __init acpi_os_name_setup(char *str)
1056 {
1057         char *p = acpi_os_name;
1058         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1059
1060         if (!str || !*str)
1061                 return 0;
1062
1063         for (; count-- && str && *str; str++) {
1064                 if (isalnum(*str) || *str == ' ' || *str == ':')
1065                         *p++ = *str;
1066                 else if (*str == '\'' || *str == '"')
1067                         continue;
1068                 else
1069                         break;
1070         }
1071         *p = 0;
1072
1073         return 1;
1074
1075 }
1076
1077 __setup("acpi_os_name=", acpi_os_name_setup);
1078
1079 static void __init set_osi_linux(unsigned int enable)
1080 {
1081         if (osi_linux.enable != enable) {
1082                 osi_linux.enable = enable;
1083                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1084                         enable ? "Add": "Delet");
1085         }
1086         return;
1087 }
1088
1089 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1090 {
1091         osi_linux.cmdline = 1;  /* cmdline set the default */
1092         set_osi_linux(enable);
1093
1094         return;
1095 }
1096
1097 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1098 {
1099         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1100
1101         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1102
1103         if (enable == -1)
1104                 return;
1105
1106         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1107
1108         set_osi_linux(enable);
1109
1110         return;
1111 }
1112
1113 /*
1114  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1115  *
1116  * empty string disables _OSI
1117  * string starting with '!' disables that string
1118  * otherwise string is added to list, augmenting built-in strings
1119  */
1120 int __init acpi_osi_setup(char *str)
1121 {
1122         if (str == NULL || *str == '\0') {
1123                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1124                 acpi_gbl_create_osi_method = FALSE;
1125         } else if (!strcmp("!Linux", str)) {
1126                 acpi_cmdline_osi_linux(0);      /* !enable */
1127         } else if (*str == '!') {
1128                 if (acpi_osi_invalidate(++str) == AE_OK)
1129                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1130         } else if (!strcmp("Linux", str)) {
1131                 acpi_cmdline_osi_linux(1);      /* enable */
1132         } else if (*osi_additional_string == '\0') {
1133                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1134                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1135         }
1136
1137         return 1;
1138 }
1139
1140 __setup("acpi_osi=", acpi_osi_setup);
1141
1142 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1143 static int __init acpi_serialize_setup(char *str)
1144 {
1145         printk(KERN_INFO PREFIX "serialize enabled\n");
1146
1147         acpi_gbl_all_methods_serialized = TRUE;
1148
1149         return 1;
1150 }
1151
1152 __setup("acpi_serialize", acpi_serialize_setup);
1153
1154 /* Check of resource interference between native drivers and ACPI
1155  * OperationRegions (SystemIO and System Memory only).
1156  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1157  * in arbitrary AML code and can interfere with legacy drivers.
1158  * acpi_enforce_resources= can be set to:
1159  *
1160  *   - strict (default) (2)
1161  *     -> further driver trying to access the resources will not load
1162  *   - lax              (1)
1163  *     -> further driver trying to access the resources will load, but you
1164  *     get a system message that something might go wrong...
1165  *
1166  *   - no               (0)
1167  *     -> ACPI Operation Region resources will not be registered
1168  *
1169  */
1170 #define ENFORCE_RESOURCES_STRICT 2
1171 #define ENFORCE_RESOURCES_LAX    1
1172 #define ENFORCE_RESOURCES_NO     0
1173
1174 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1175
1176 static int __init acpi_enforce_resources_setup(char *str)
1177 {
1178         if (str == NULL || *str == '\0')
1179                 return 0;
1180
1181         if (!strcmp("strict", str))
1182                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1183         else if (!strcmp("lax", str))
1184                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1185         else if (!strcmp("no", str))
1186                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1187
1188         return 1;
1189 }
1190
1191 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1192
1193 /* Check for resource conflicts between ACPI OperationRegions and native
1194  * drivers */
1195 int acpi_check_resource_conflict(const struct resource *res)
1196 {
1197         struct acpi_res_list *res_list_elem;
1198         int ioport;
1199         int clash = 0;
1200
1201         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1202                 return 0;
1203         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1204                 return 0;
1205
1206         ioport = res->flags & IORESOURCE_IO;
1207
1208         spin_lock(&acpi_res_lock);
1209         list_for_each_entry(res_list_elem, &resource_list_head,
1210                             resource_list) {
1211                 if (ioport && (res_list_elem->resource_type
1212                                != ACPI_ADR_SPACE_SYSTEM_IO))
1213                         continue;
1214                 if (!ioport && (res_list_elem->resource_type
1215                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1216                         continue;
1217
1218                 if (res->end < res_list_elem->start
1219                     || res_list_elem->end < res->start)
1220                         continue;
1221                 clash = 1;
1222                 break;
1223         }
1224         spin_unlock(&acpi_res_lock);
1225
1226         if (clash) {
1227                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1228                         printk(KERN_WARNING "ACPI: resource %s %pR"
1229                                " conflicts with ACPI region %s %pR\n",
1230                                res->name, res, res_list_elem->name,
1231                                res_list_elem);
1232                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1233                                 printk(KERN_NOTICE "ACPI: This conflict may"
1234                                        " cause random problems and system"
1235                                        " instability\n");
1236                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1237                                " for this device, you should use it instead of"
1238                                " the native driver\n");
1239                 }
1240                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1241                         return -EBUSY;
1242         }
1243         return 0;
1244 }
1245 EXPORT_SYMBOL(acpi_check_resource_conflict);
1246
1247 int acpi_check_region(resource_size_t start, resource_size_t n,
1248                       const char *name)
1249 {
1250         struct resource res = {
1251                 .start = start,
1252                 .end   = start + n - 1,
1253                 .name  = name,
1254                 .flags = IORESOURCE_IO,
1255         };
1256
1257         return acpi_check_resource_conflict(&res);
1258 }
1259 EXPORT_SYMBOL(acpi_check_region);
1260
1261 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1262                       const char *name)
1263 {
1264         struct resource res = {
1265                 .start = start,
1266                 .end   = start + n - 1,
1267                 .name  = name,
1268                 .flags = IORESOURCE_MEM,
1269         };
1270
1271         return acpi_check_resource_conflict(&res);
1272
1273 }
1274 EXPORT_SYMBOL(acpi_check_mem_region);
1275
1276 /*
1277  * Let drivers know whether the resource checks are effective
1278  */
1279 int acpi_resources_are_enforced(void)
1280 {
1281         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1282 }
1283 EXPORT_SYMBOL(acpi_resources_are_enforced);
1284
1285 /*
1286  * Acquire a spinlock.
1287  *
1288  * handle is a pointer to the spinlock_t.
1289  */
1290
1291 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1292 {
1293         acpi_cpu_flags flags;
1294         spin_lock_irqsave(lockp, flags);
1295         return flags;
1296 }
1297
1298 /*
1299  * Release a spinlock. See above.
1300  */
1301
1302 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1303 {
1304         spin_unlock_irqrestore(lockp, flags);
1305 }
1306
1307 #ifndef ACPI_USE_LOCAL_CACHE
1308
1309 /*******************************************************************************
1310  *
1311  * FUNCTION:    acpi_os_create_cache
1312  *
1313  * PARAMETERS:  name      - Ascii name for the cache
1314  *              size      - Size of each cached object
1315  *              depth     - Maximum depth of the cache (in objects) <ignored>
1316  *              cache     - Where the new cache object is returned
1317  *
1318  * RETURN:      status
1319  *
1320  * DESCRIPTION: Create a cache object
1321  *
1322  ******************************************************************************/
1323
1324 acpi_status
1325 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1326 {
1327         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1328         if (*cache == NULL)
1329                 return AE_ERROR;
1330         else
1331                 return AE_OK;
1332 }
1333
1334 /*******************************************************************************
1335  *
1336  * FUNCTION:    acpi_os_purge_cache
1337  *
1338  * PARAMETERS:  Cache           - Handle to cache object
1339  *
1340  * RETURN:      Status
1341  *
1342  * DESCRIPTION: Free all objects within the requested cache.
1343  *
1344  ******************************************************************************/
1345
1346 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1347 {
1348         kmem_cache_shrink(cache);
1349         return (AE_OK);
1350 }
1351
1352 /*******************************************************************************
1353  *
1354  * FUNCTION:    acpi_os_delete_cache
1355  *
1356  * PARAMETERS:  Cache           - Handle to cache object
1357  *
1358  * RETURN:      Status
1359  *
1360  * DESCRIPTION: Free all objects within the requested cache and delete the
1361  *              cache object.
1362  *
1363  ******************************************************************************/
1364
1365 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1366 {
1367         kmem_cache_destroy(cache);
1368         return (AE_OK);
1369 }
1370
1371 /*******************************************************************************
1372  *
1373  * FUNCTION:    acpi_os_release_object
1374  *
1375  * PARAMETERS:  Cache       - Handle to cache object
1376  *              Object      - The object to be released
1377  *
1378  * RETURN:      None
1379  *
1380  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1381  *              the object is deleted.
1382  *
1383  ******************************************************************************/
1384
1385 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1386 {
1387         kmem_cache_free(cache, object);
1388         return (AE_OK);
1389 }
1390
1391 /******************************************************************************
1392  *
1393  * FUNCTION:    acpi_os_validate_interface
1394  *
1395  * PARAMETERS:  interface           - Requested interface to be validated
1396  *
1397  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1398  *
1399  * DESCRIPTION: Match an interface string to the interfaces supported by the
1400  *              host. Strings originate from an AML call to the _OSI method.
1401  *
1402  *****************************************************************************/
1403
1404 acpi_status
1405 acpi_os_validate_interface (char *interface)
1406 {
1407         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1408                 return AE_OK;
1409         if (!strcmp("Linux", interface)) {
1410
1411                 printk(KERN_NOTICE PREFIX
1412                         "BIOS _OSI(Linux) query %s%s\n",
1413                         osi_linux.enable ? "honored" : "ignored",
1414                         osi_linux.cmdline ? " via cmdline" :
1415                         osi_linux.dmi ? " via DMI" : "");
1416
1417                 if (osi_linux.enable)
1418                         return AE_OK;
1419         }
1420         return AE_SUPPORT;
1421 }
1422
1423 static inline int acpi_res_list_add(struct acpi_res_list *res)
1424 {
1425         struct acpi_res_list *res_list_elem;
1426
1427         list_for_each_entry(res_list_elem, &resource_list_head,
1428                             resource_list) {
1429
1430                 if (res->resource_type == res_list_elem->resource_type &&
1431                     res->start == res_list_elem->start &&
1432                     res->end == res_list_elem->end) {
1433
1434                         /*
1435                          * The Region(addr,len) already exist in the list,
1436                          * just increase the count
1437                          */
1438
1439                         res_list_elem->count++;
1440                         return 0;
1441                 }
1442         }
1443
1444         res->count = 1;
1445         list_add(&res->resource_list, &resource_list_head);
1446         return 1;
1447 }
1448
1449 static inline void acpi_res_list_del(struct acpi_res_list *res)
1450 {
1451         struct acpi_res_list *res_list_elem;
1452
1453         list_for_each_entry(res_list_elem, &resource_list_head,
1454                             resource_list) {
1455
1456                 if (res->resource_type == res_list_elem->resource_type &&
1457                     res->start == res_list_elem->start &&
1458                     res->end == res_list_elem->end) {
1459
1460                         /*
1461                          * If the res count is decreased to 0,
1462                          * remove and free it
1463                          */
1464
1465                         if (--res_list_elem->count == 0) {
1466                                 list_del(&res_list_elem->resource_list);
1467                                 kfree(res_list_elem);
1468                         }
1469                         return;
1470                 }
1471         }
1472 }
1473
1474 acpi_status
1475 acpi_os_invalidate_address(
1476     u8                   space_id,
1477     acpi_physical_address   address,
1478     acpi_size               length)
1479 {
1480         struct acpi_res_list res;
1481
1482         switch (space_id) {
1483         case ACPI_ADR_SPACE_SYSTEM_IO:
1484         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1485                 /* Only interference checks against SystemIO and SystemMemory
1486                    are needed */
1487                 res.start = address;
1488                 res.end = address + length - 1;
1489                 res.resource_type = space_id;
1490                 spin_lock(&acpi_res_lock);
1491                 acpi_res_list_del(&res);
1492                 spin_unlock(&acpi_res_lock);
1493                 break;
1494         case ACPI_ADR_SPACE_PCI_CONFIG:
1495         case ACPI_ADR_SPACE_EC:
1496         case ACPI_ADR_SPACE_SMBUS:
1497         case ACPI_ADR_SPACE_CMOS:
1498         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1499         case ACPI_ADR_SPACE_DATA_TABLE:
1500         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1501                 break;
1502         }
1503         return AE_OK;
1504 }
1505
1506 /******************************************************************************
1507  *
1508  * FUNCTION:    acpi_os_validate_address
1509  *
1510  * PARAMETERS:  space_id             - ACPI space ID
1511  *              address             - Physical address
1512  *              length              - Address length
1513  *
1514  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1515  *              should return AE_AML_ILLEGAL_ADDRESS.
1516  *
1517  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1518  *              the addresses accessed by AML operation regions.
1519  *
1520  *****************************************************************************/
1521
1522 acpi_status
1523 acpi_os_validate_address (
1524     u8                   space_id,
1525     acpi_physical_address   address,
1526     acpi_size               length,
1527     char *name)
1528 {
1529         struct acpi_res_list *res;
1530         int added;
1531         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1532                 return AE_OK;
1533
1534         switch (space_id) {
1535         case ACPI_ADR_SPACE_SYSTEM_IO:
1536         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1537                 /* Only interference checks against SystemIO and SystemMemory
1538                    are needed */
1539                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1540                 if (!res)
1541                         return AE_OK;
1542                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1543                 strlcpy(res->name, name, 5);
1544                 res->start = address;
1545                 res->end = address + length - 1;
1546                 res->resource_type = space_id;
1547                 spin_lock(&acpi_res_lock);
1548                 added = acpi_res_list_add(res);
1549                 spin_unlock(&acpi_res_lock);
1550                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1551                          "name: %s\n", added ? "Added" : "Already exist",
1552                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1553                          ? "SystemIO" : "System Memory",
1554                          (unsigned long long)res->start,
1555                          (unsigned long long)res->end,
1556                          res->name);
1557                 if (!added)
1558                         kfree(res);
1559                 break;
1560         case ACPI_ADR_SPACE_PCI_CONFIG:
1561         case ACPI_ADR_SPACE_EC:
1562         case ACPI_ADR_SPACE_SMBUS:
1563         case ACPI_ADR_SPACE_CMOS:
1564         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1565         case ACPI_ADR_SPACE_DATA_TABLE:
1566         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1567                 break;
1568         }
1569         return AE_OK;
1570 }
1571 #endif
1572
1573 acpi_status __init acpi_os_initialize(void)
1574 {
1575         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1576         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1577         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1578         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1579
1580         return AE_OK;
1581 }
1582
1583 acpi_status acpi_os_initialize1(void)
1584 {
1585         kacpid_wq = create_workqueue("kacpid");
1586         kacpi_notify_wq = create_workqueue("kacpi_notify");
1587         kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
1588         BUG_ON(!kacpid_wq);
1589         BUG_ON(!kacpi_notify_wq);
1590         BUG_ON(!kacpi_hotplug_wq);
1591         return AE_OK;
1592 }
1593
1594 acpi_status acpi_os_terminate(void)
1595 {
1596         if (acpi_irq_handler) {
1597                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
1598                                                  acpi_irq_handler);
1599         }
1600
1601         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1602         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1603         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1604         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1605
1606         destroy_workqueue(kacpid_wq);
1607         destroy_workqueue(kacpi_notify_wq);
1608         destroy_workqueue(kacpi_hotplug_wq);
1609
1610         return AE_OK;
1611 }