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  *  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' or RCU read 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_rcu(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' or RCU read 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_rcu(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_rcu(&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_rcu(&map->list);
 332         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 333
 334         synchronize_rcu();
 335         iounmap(map->virt);
 336         kfree(map);
 337 }
 338 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 339
 340 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 341 {
 342         if (!acpi_gbl_permanent_mmap)
 343                 __acpi_unmap_table(virt, size);
 344 }
 345
 346 int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 347 {
 348         void __iomem *virt;
 349
 350         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 351                 return 0;
 352
 353         if (!addr->address || !addr->bit_width)
 354                 return -EINVAL;
 355
 356         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 357         if (!virt)
 358                 return -EIO;
 359
 360         return 0;
 361 }
 362 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address);
 363
 364 void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 365 {
 366         void __iomem *virt;
 367         unsigned long flags;
 368         acpi_size size = addr->bit_width / 8;
 369
 370         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 371                 return;
 372
 373         if (!addr->address || !addr->bit_width)
 374                 return;
 375
 376         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 377         virt = acpi_map_vaddr_lookup(addr->address, size);
 378         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 379
 380         acpi_os_unmap_memory(virt, size);
 381 }
 382 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address);
 383
 384 #ifdef ACPI_FUTURE_USAGE
 385 acpi_status
 386 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 387 {
 388         if (!phys || !virt)
 389                 return AE_BAD_PARAMETER;
 390
 391         *phys = virt_to_phys(virt);
 392
 393         return AE_OK;
 394 }
 395 #endif
 396
 397 #define ACPI_MAX_OVERRIDE_LEN 100
 398
 399 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 400
 401 acpi_status
 402 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 403                             acpi_string * new_val)
 404 {
 405         if (!init_val || !new_val)
 406                 return AE_BAD_PARAMETER;
 407
 408         *new_val = NULL;
 409         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 410                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 411                        acpi_os_name);
 412                 *new_val = acpi_os_name;
 413         }
 414
 415         return AE_OK;
 416 }
 417
 418 acpi_status
 419 acpi_os_table_override(struct acpi_table_header * existing_table,
 420                        struct acpi_table_header ** new_table)
 421 {
 422         if (!existing_table || !new_table)
 423                 return AE_BAD_PARAMETER;
 424
 425         *new_table = NULL;
 426
 427 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 428         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 429                 *new_table = (struct acpi_table_header *)AmlCode;
 430 #endif
 431         if (*new_table != NULL) {
 432                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 433                            "this is unsafe: tainting kernel\n",
 434                        existing_table->signature,
 435                        existing_table->oem_table_id);
 436                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 437         }
 438         return AE_OK;
 439 }
 440
 441 static irqreturn_t acpi_irq(int irq, void *dev_id)
 442 {
 443         u32 handled;
 444
 445         handled = (*acpi_irq_handler) (acpi_irq_context);
 446
 447         if (handled) {
 448                 acpi_irq_handled++;
 449                 return IRQ_HANDLED;
 450         } else {
 451                 acpi_irq_not_handled++;
 452                 return IRQ_NONE;
 453         }
 454 }
 455
 456 acpi_status
 457 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 458                                   void *context)
 459 {
 460         unsigned int irq;
 461
 462         acpi_irq_stats_init();
 463
 464         /*
 465          * Ignore the GSI from the core, and use the value in our copy of the
 466          * FADT. It may not be the same if an interrupt source override exists
 467          * for the SCI.
 468          */
 469         gsi = acpi_gbl_FADT.sci_interrupt;
 470         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 471                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 472                        gsi);
 473                 return AE_OK;
 474         }
 475
 476         acpi_irq_handler = handler;
 477         acpi_irq_context = context;
 478         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 479                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 480                 return AE_NOT_ACQUIRED;
 481         }
 482         acpi_irq_irq = irq;
 483
 484         return AE_OK;
 485 }
 486
 487 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 488 {
 489         if (irq) {
 490                 free_irq(irq, acpi_irq);
 491                 acpi_irq_handler = NULL;
 492                 acpi_irq_irq = 0;
 493         }
 494
 495         return AE_OK;
 496 }
 497
 498 /*
 499  * Running in interpreter thread context, safe to sleep
 500  */
 501
 502 void acpi_os_sleep(u64 ms)
 503 {
 504         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 505 }
 506
 507 void acpi_os_stall(u32 us)
 508 {
 509         while (us) {
 510                 u32 delay = 1000;
 511
 512                 if (delay > us)
 513                         delay = us;
 514                 udelay(delay);
 515                 touch_nmi_watchdog();
 516                 us -= delay;
 517         }
 518 }
 519
 520 /*
 521  * Support ACPI 3.0 AML Timer operand
 522  * Returns 64-bit free-running, monotonically increasing timer
 523  * with 100ns granularity
 524  */
 525 u64 acpi_os_get_timer(void)
 526 {
 527         static u64 t;
 528
 529 #ifdef  CONFIG_HPET
 530         /* TBD: use HPET if available */
 531 #endif
 532
 533 #ifdef  CONFIG_X86_PM_TIMER
 534         /* TBD: default to PM timer if HPET was not available */
 535 #endif
 536         if (!t)
 537                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 538
 539         return ++t;
 540 }
 541
 542 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 543 {
 544         u32 dummy;
 545
 546         if (!value)
 547                 value = &dummy;
 548
 549         *value = 0;
 550         if (width <= 8) {
 551                 *(u8 *) value = inb(port);
 552         } else if (width <= 16) {
 553                 *(u16 *) value = inw(port);
 554         } else if (width <= 32) {
 555                 *(u32 *) value = inl(port);
 556         } else {
 557                 BUG();
 558         }
 559
 560         return AE_OK;
 561 }
 562
 563 EXPORT_SYMBOL(acpi_os_read_port);
 564
 565 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 566 {
 567         if (width <= 8) {
 568                 outb(value, port);
 569         } else if (width <= 16) {
 570                 outw(value, port);
 571         } else if (width <= 32) {
 572                 outl(value, port);
 573         } else {
 574                 BUG();
 575         }
 576
 577         return AE_OK;
 578 }
 579
 580 EXPORT_SYMBOL(acpi_os_write_port);
 581
 582 acpi_status
 583 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 584 {
 585         u32 dummy;
 586         void __iomem *virt_addr;
 587         int size = width / 8, unmap = 0;
 588
 589         rcu_read_lock();
 590         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 591         rcu_read_unlock();
 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
 625         rcu_read_lock();
 626         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 627         rcu_read_unlock();
 628         if (!virt_addr) {
 629                 virt_addr = ioremap(phys_addr, size);
 630                 unmap = 1;
 631         }
 632
 633         switch (width) {
 634         case 8:
 635                 writeb(value, virt_addr);
 636                 break;
 637         case 16:
 638                 writew(value, virt_addr);
 639                 break;
 640         case 32:
 641                 writel(value, virt_addr);
 642                 break;
 643         default:
 644                 BUG();
 645         }
 646
 647         if (unmap)
 648                 iounmap(virt_addr);
 649
 650         return AE_OK;
 651 }
 652
 653 acpi_status
 654 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 655                                u32 *value, u32 width)
 656 {
 657         int result, size;
 658
 659         if (!value)
 660                 return AE_BAD_PARAMETER;
 661
 662         switch (width) {
 663         case 8:
 664                 size = 1;
 665                 break;
 666         case 16:
 667                 size = 2;
 668                 break;
 669         case 32:
 670                 size = 4;
 671                 break;
 672         default:
 673                 return AE_ERROR;
 674         }
 675
 676         result = raw_pci_read(pci_id->segment, pci_id->bus,
 677                                 PCI_DEVFN(pci_id->device, pci_id->function),
 678                                 reg, size, value);
 679
 680         return (result ? AE_ERROR : AE_OK);
 681 }
 682
 683 acpi_status
 684 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 685                                 u64 value, u32 width)
 686 {
 687         int result, size;
 688
 689         switch (width) {
 690         case 8:
 691                 size = 1;
 692                 break;
 693         case 16:
 694                 size = 2;
 695                 break;
 696         case 32:
 697                 size = 4;
 698                 break;
 699         default:
 700                 return AE_ERROR;
 701         }
 702
 703         result = raw_pci_write(pci_id->segment, pci_id->bus,
 704                                 PCI_DEVFN(pci_id->device, pci_id->function),
 705                                 reg, size, value);
 706
 707         return (result ? AE_ERROR : AE_OK);
 708 }
 709
 710 /* TODO: Change code to take advantage of driver model more */
 711 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 712                                     acpi_handle chandle,        /* current node */
 713                                     struct acpi_pci_id **id,
 714                                     int *is_bridge, u8 * bus_number)
 715 {
 716         acpi_handle handle;
 717         struct acpi_pci_id *pci_id = *id;
 718         acpi_status status;
 719         unsigned long long temp;
 720         acpi_object_type type;
 721
 722         acpi_get_parent(chandle, &handle);
 723         if (handle != rhandle) {
 724                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 725                                         bus_number);
 726
 727                 status = acpi_get_type(handle, &type);
 728                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 729                         return;
 730
 731                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 732                                           &temp);
 733                 if (ACPI_SUCCESS(status)) {
 734                         u32 val;
 735                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 736                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 737
 738                         if (*is_bridge)
 739                                 pci_id->bus = *bus_number;
 740
 741                         /* any nicer way to get bus number of bridge ? */
 742                         status =
 743                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 744                                                            8);
 745                         if (ACPI_SUCCESS(status)
 746                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 747                                 status =
 748                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 749                                                                    &val, 8);
 750                                 if (!ACPI_SUCCESS(status)) {
 751                                         /* Certainly broken...  FIX ME */
 752                                         return;
 753                                 }
 754                                 *is_bridge = 1;
 755                                 pci_id->bus = val;
 756                                 status =
 757                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 758                                                                    &val, 8);
 759                                 if (ACPI_SUCCESS(status)) {
 760                                         *bus_number = val;
 761                                 }
 762                         } else
 763                                 *is_bridge = 0;
 764                 }
 765         }
 766 }
 767
 768 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 769                            acpi_handle chandle, /* current node */
 770                            struct acpi_pci_id **id)
 771 {
 772         int is_bridge = 1;
 773         u8 bus_number = (*id)->bus;
 774
 775         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 776 }
 777
 778 static void acpi_os_execute_deferred(struct work_struct *work)
 779 {
 780         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 781
 782         if (dpc->wait)
 783                 acpi_os_wait_events_complete(NULL);
 784
 785         dpc->function(dpc->context);
 786         kfree(dpc);
 787 }
 788
 789 /*******************************************************************************
 790  *
 791  * FUNCTION:    acpi_os_execute
 792  *
 793  * PARAMETERS:  Type               - Type of the callback
 794  *              Function           - Function to be executed
 795  *              Context            - Function parameters
 796  *
 797  * RETURN:      Status
 798  *
 799  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 800  *              immediately executes function on a separate thread.
 801  *
 802  ******************************************************************************/
 803
 804 static acpi_status __acpi_os_execute(acpi_execute_type type,
 805         acpi_osd_exec_callback function, void *context, int hp)
 806 {
 807         acpi_status status = AE_OK;
 808         struct acpi_os_dpc *dpc;
 809         struct workqueue_struct *queue;
 810         int ret;
 811         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 812                           "Scheduling function [%p(%p)] for deferred execution.\n",
 813                           function, context));
 814
 815         /*
 816          * Allocate/initialize DPC structure.  Note that this memory will be
 817          * freed by the callee.  The kernel handles the work_struct list  in a
 818          * way that allows us to also free its memory inside the callee.
 819          * Because we may want to schedule several tasks with different
 820          * parameters we can't use the approach some kernel code uses of
 821          * having a static work_struct.
 822          */
 823
 824         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 825         if (!dpc)
 826                 return AE_NO_MEMORY;
 827
 828         dpc->function = function;
 829         dpc->context = context;
 830
 831         /*
 832          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 833          * because the hotplug code may call driver .remove() functions,
 834          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 835          * to flush these workqueues.
 836          */
 837         queue = hp ? kacpi_hotplug_wq :
 838                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 839         dpc->wait = hp ? 1 : 0;
 840
 841         if (queue == kacpi_hotplug_wq)
 842                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 843         else if (queue == kacpi_notify_wq)
 844                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 845         else
 846                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 847
 848         /*
 849          * On some machines, a software-initiated SMI causes corruption unless
 850          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 851          * typically it's done in GPE-related methods that are run via
 852          * workqueues, so we can avoid the known corruption cases by always
 853          * queueing on CPU 0.
 854          */
 855         ret = queue_work_on(0, queue, &dpc->work);
 856
 857         if (!ret) {
 858                 printk(KERN_ERR PREFIX
 859                           "Call to queue_work() failed.\n");
 860                 status = AE_ERROR;
 861                 kfree(dpc);
 862         }
 863         return status;
 864 }
 865
 866 acpi_status acpi_os_execute(acpi_execute_type type,
 867                             acpi_osd_exec_callback function, void *context)
 868 {
 869         return __acpi_os_execute(type, function, context, 0);
 870 }
 871 EXPORT_SYMBOL(acpi_os_execute);
 872
 873 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 874         void *context)
 875 {
 876         return __acpi_os_execute(0, function, context, 1);
 877 }
 878
 879 void acpi_os_wait_events_complete(void *context)
 880 {
 881         flush_workqueue(kacpid_wq);
 882         flush_workqueue(kacpi_notify_wq);
 883 }
 884
 885 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 886
 887 /*
 888  * Allocate the memory for a spinlock and initialize it.
 889  */
 890 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 891 {
 892         spin_lock_init(*handle);
 893
 894         return AE_OK;
 895 }
 896
 897 /*
 898  * Deallocate the memory for a spinlock.
 899  */
 900 void acpi_os_delete_lock(acpi_spinlock handle)
 901 {
 902         return;
 903 }
 904
 905 acpi_status
 906 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 907 {
 908         struct semaphore *sem = NULL;
 909
 910         sem = acpi_os_allocate(sizeof(struct semaphore));
 911         if (!sem)
 912                 return AE_NO_MEMORY;
 913         memset(sem, 0, sizeof(struct semaphore));
 914
 915         sema_init(sem, initial_units);
 916
 917         *handle = (acpi_handle *) sem;
 918
 919         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 920                           *handle, initial_units));
 921
 922         return AE_OK;
 923 }
 924
 925 /*
 926  * TODO: A better way to delete semaphores?  Linux doesn't have a
 927  * 'delete_semaphore()' function -- may result in an invalid
 928  * pointer dereference for non-synchronized consumers.  Should
 929  * we at least check for blocked threads and signal/cancel them?
 930  */
 931
 932 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 933 {
 934         struct semaphore *sem = (struct semaphore *)handle;
 935
 936         if (!sem)
 937                 return AE_BAD_PARAMETER;
 938
 939         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 940
 941         BUG_ON(!list_empty(&sem->wait_list));
 942         kfree(sem);
 943         sem = NULL;
 944
 945         return AE_OK;
 946 }
 947
 948 /*
 949  * TODO: Support for units > 1?
 950  */
 951 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 952 {
 953         acpi_status status = AE_OK;
 954         struct semaphore *sem = (struct semaphore *)handle;
 955         long jiffies;
 956         int ret = 0;
 957
 958         if (!sem || (units < 1))
 959                 return AE_BAD_PARAMETER;
 960
 961         if (units > 1)
 962                 return AE_SUPPORT;
 963
 964         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 965                           handle, units, timeout));
 966
 967         if (timeout == ACPI_WAIT_FOREVER)
 968                 jiffies = MAX_SCHEDULE_TIMEOUT;
 969         else
 970                 jiffies = msecs_to_jiffies(timeout);
 971
 972         ret = down_timeout(sem, jiffies);
 973         if (ret)
 974                 status = AE_TIME;
 975
 976         if (ACPI_FAILURE(status)) {
 977                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 978                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 979                                   handle, units, timeout,
 980                                   acpi_format_exception(status)));
 981         } else {
 982                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 983                                   "Acquired semaphore[%p|%d|%d]", handle,
 984                                   units, timeout));
 985         }
 986
 987         return status;
 988 }
 989
 990 /*
 991  * TODO: Support for units > 1?
 992  */
 993 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 994 {
 995         struct semaphore *sem = (struct semaphore *)handle;
 996
 997         if (!sem || (units < 1))
 998                 return AE_BAD_PARAMETER;
 999
1000         if (units > 1)
1001                 return AE_SUPPORT;
1002
1003         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1004                           units));
1005
1006         up(sem);
1007
1008         return AE_OK;
1009 }
1010
1011 #ifdef ACPI_FUTURE_USAGE
1012 u32 acpi_os_get_line(char *buffer)
1013 {
1014
1015 #ifdef ENABLE_DEBUGGER
1016         if (acpi_in_debugger) {
1017                 u32 chars;
1018
1019                 kdb_read(buffer, sizeof(line_buf));
1020
1021                 /* remove the CR kdb includes */
1022                 chars = strlen(buffer) - 1;
1023                 buffer[chars] = '\0';
1024         }
1025 #endif
1026
1027         return 0;
1028 }
1029 #endif                          /*  ACPI_FUTURE_USAGE  */
1030
1031 acpi_status acpi_os_signal(u32 function, void *info)
1032 {
1033         switch (function) {
1034         case ACPI_SIGNAL_FATAL:
1035                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1036                 break;
1037         case ACPI_SIGNAL_BREAKPOINT:
1038                 /*
1039                  * AML Breakpoint
1040                  * ACPI spec. says to treat it as a NOP unless
1041                  * you are debugging.  So if/when we integrate
1042                  * AML debugger into the kernel debugger its
1043                  * hook will go here.  But until then it is
1044                  * not useful to print anything on breakpoints.
1045                  */
1046                 break;
1047         default:
1048                 break;
1049         }
1050
1051         return AE_OK;
1052 }
1053
1054 static int __init acpi_os_name_setup(char *str)
1055 {
1056         char *p = acpi_os_name;
1057         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1058
1059         if (!str || !*str)
1060                 return 0;
1061
1062         for (; count-- && str && *str; str++) {
1063                 if (isalnum(*str) || *str == ' ' || *str == ':')
1064                         *p++ = *str;
1065                 else if (*str == '\'' || *str == '"')
1066                         continue;
1067                 else
1068                         break;
1069         }
1070         *p = 0;
1071
1072         return 1;
1073
1074 }
1075
1076 __setup("acpi_os_name=", acpi_os_name_setup);
1077
1078 static void __init set_osi_linux(unsigned int enable)
1079 {
1080         if (osi_linux.enable != enable) {
1081                 osi_linux.enable = enable;
1082                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1083                         enable ? "Add": "Delet");
1084         }
1085         return;
1086 }
1087
1088 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1089 {
1090         osi_linux.cmdline = 1;  /* cmdline set the default */
1091         set_osi_linux(enable);
1092
1093         return;
1094 }
1095
1096 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1097 {
1098         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1099
1100         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1101
1102         if (enable == -1)
1103                 return;
1104
1105         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1106
1107         set_osi_linux(enable);
1108
1109         return;
1110 }
1111
1112 /*
1113  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1114  *
1115  * empty string disables _OSI
1116  * string starting with '!' disables that string
1117  * otherwise string is added to list, augmenting built-in strings
1118  */
1119 int __init acpi_osi_setup(char *str)
1120 {
1121         if (str == NULL || *str == '\0') {
1122                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1123                 acpi_gbl_create_osi_method = FALSE;
1124         } else if (!strcmp("!Linux", str)) {
1125                 acpi_cmdline_osi_linux(0);      /* !enable */
1126         } else if (*str == '!') {
1127                 if (acpi_osi_invalidate(++str) == AE_OK)
1128                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1129         } else if (!strcmp("Linux", str)) {
1130                 acpi_cmdline_osi_linux(1);      /* enable */
1131         } else if (*osi_additional_string == '\0') {
1132                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1133                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1134         }
1135
1136         return 1;
1137 }
1138
1139 __setup("acpi_osi=", acpi_osi_setup);
1140
1141 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1142 static int __init acpi_serialize_setup(char *str)
1143 {
1144         printk(KERN_INFO PREFIX "serialize enabled\n");
1145
1146         acpi_gbl_all_methods_serialized = TRUE;
1147
1148         return 1;
1149 }
1150
1151 __setup("acpi_serialize", acpi_serialize_setup);
1152
1153 /* Check of resource interference between native drivers and ACPI
1154  * OperationRegions (SystemIO and System Memory only).
1155  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1156  * in arbitrary AML code and can interfere with legacy drivers.
1157  * acpi_enforce_resources= can be set to:
1158  *
1159  *   - strict (default) (2)
1160  *     -> further driver trying to access the resources will not load
1161  *   - lax              (1)
1162  *     -> further driver trying to access the resources will load, but you
1163  *     get a system message that something might go wrong...
1164  *
1165  *   - no               (0)
1166  *     -> ACPI Operation Region resources will not be registered
1167  *
1168  */
1169 #define ENFORCE_RESOURCES_STRICT 2
1170 #define ENFORCE_RESOURCES_LAX    1
1171 #define ENFORCE_RESOURCES_NO     0
1172
1173 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1174
1175 static int __init acpi_enforce_resources_setup(char *str)
1176 {
1177         if (str == NULL || *str == '\0')
1178                 return 0;
1179
1180         if (!strcmp("strict", str))
1181                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1182         else if (!strcmp("lax", str))
1183                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1184         else if (!strcmp("no", str))
1185                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1186
1187         return 1;
1188 }
1189
1190 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1191
1192 /* Check for resource conflicts between ACPI OperationRegions and native
1193  * drivers */
1194 int acpi_check_resource_conflict(const struct resource *res)
1195 {
1196         struct acpi_res_list *res_list_elem;
1197         int ioport;
1198         int clash = 0;
1199
1200         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1201                 return 0;
1202         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1203                 return 0;
1204
1205         ioport = res->flags & IORESOURCE_IO;
1206
1207         spin_lock(&acpi_res_lock);
1208         list_for_each_entry(res_list_elem, &resource_list_head,
1209                             resource_list) {
1210                 if (ioport && (res_list_elem->resource_type
1211                                != ACPI_ADR_SPACE_SYSTEM_IO))
1212                         continue;
1213                 if (!ioport && (res_list_elem->resource_type
1214                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1215                         continue;
1216
1217                 if (res->end < res_list_elem->start
1218                     || res_list_elem->end < res->start)
1219                         continue;
1220                 clash = 1;
1221                 break;
1222         }
1223         spin_unlock(&acpi_res_lock);
1224
1225         if (clash) {
1226                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1227                         printk(KERN_WARNING "ACPI: resource %s %pR"
1228                                " conflicts with ACPI region %s %pR\n",
1229                                res->name, res, res_list_elem->name,
1230                                res_list_elem);
1231                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1232                                 printk(KERN_NOTICE "ACPI: This conflict may"
1233                                        " cause random problems and system"
1234                                        " instability\n");
1235                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1236                                " for this device, you should use it instead of"
1237                                " the native driver\n");
1238                 }
1239                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1240                         return -EBUSY;
1241         }
1242         return 0;
1243 }
1244 EXPORT_SYMBOL(acpi_check_resource_conflict);
1245
1246 int acpi_check_region(resource_size_t start, resource_size_t n,
1247                       const char *name)
1248 {
1249         struct resource res = {
1250                 .start = start,
1251                 .end   = start + n - 1,
1252                 .name  = name,
1253                 .flags = IORESOURCE_IO,
1254         };
1255
1256         return acpi_check_resource_conflict(&res);
1257 }
1258 EXPORT_SYMBOL(acpi_check_region);
1259
1260 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1261                       const char *name)
1262 {
1263         struct resource res = {
1264                 .start = start,
1265                 .end   = start + n - 1,
1266                 .name  = name,
1267                 .flags = IORESOURCE_MEM,
1268         };
1269
1270         return acpi_check_resource_conflict(&res);
1271
1272 }
1273 EXPORT_SYMBOL(acpi_check_mem_region);
1274
1275 /*
1276  * Let drivers know whether the resource checks are effective
1277  */
1278 int acpi_resources_are_enforced(void)
1279 {
1280         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1281 }
1282 EXPORT_SYMBOL(acpi_resources_are_enforced);
1283
1284 /*
1285  * Acquire a spinlock.
1286  *
1287  * handle is a pointer to the spinlock_t.
1288  */
1289
1290 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1291 {
1292         acpi_cpu_flags flags;
1293         spin_lock_irqsave(lockp, flags);
1294         return flags;
1295 }
1296
1297 /*
1298  * Release a spinlock. See above.
1299  */
1300
1301 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1302 {
1303         spin_unlock_irqrestore(lockp, flags);
1304 }
1305
1306 #ifndef ACPI_USE_LOCAL_CACHE
1307
1308 /*******************************************************************************
1309  *
1310  * FUNCTION:    acpi_os_create_cache
1311  *
1312  * PARAMETERS:  name      - Ascii name for the cache
1313  *              size      - Size of each cached object
1314  *              depth     - Maximum depth of the cache (in objects) <ignored>
1315  *              cache     - Where the new cache object is returned
1316  *
1317  * RETURN:      status
1318  *
1319  * DESCRIPTION: Create a cache object
1320  *
1321  ******************************************************************************/
1322
1323 acpi_status
1324 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1325 {
1326         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1327         if (*cache == NULL)
1328                 return AE_ERROR;
1329         else
1330                 return AE_OK;
1331 }
1332
1333 /*******************************************************************************
1334  *
1335  * FUNCTION:    acpi_os_purge_cache
1336  *
1337  * PARAMETERS:  Cache           - Handle to cache object
1338  *
1339  * RETURN:      Status
1340  *
1341  * DESCRIPTION: Free all objects within the requested cache.
1342  *
1343  ******************************************************************************/
1344
1345 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1346 {
1347         kmem_cache_shrink(cache);
1348         return (AE_OK);
1349 }
1350
1351 /*******************************************************************************
1352  *
1353  * FUNCTION:    acpi_os_delete_cache
1354  *
1355  * PARAMETERS:  Cache           - Handle to cache object
1356  *
1357  * RETURN:      Status
1358  *
1359  * DESCRIPTION: Free all objects within the requested cache and delete the
1360  *              cache object.
1361  *
1362  ******************************************************************************/
1363
1364 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1365 {
1366         kmem_cache_destroy(cache);
1367         return (AE_OK);
1368 }
1369
1370 /*******************************************************************************
1371  *
1372  * FUNCTION:    acpi_os_release_object
1373  *
1374  * PARAMETERS:  Cache       - Handle to cache object
1375  *              Object      - The object to be released
1376  *
1377  * RETURN:      None
1378  *
1379  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1380  *              the object is deleted.
1381  *
1382  ******************************************************************************/
1383
1384 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1385 {
1386         kmem_cache_free(cache, object);
1387         return (AE_OK);
1388 }
1389
1390 /******************************************************************************
1391  *
1392  * FUNCTION:    acpi_os_validate_interface
1393  *
1394  * PARAMETERS:  interface           - Requested interface to be validated
1395  *
1396  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1397  *
1398  * DESCRIPTION: Match an interface string to the interfaces supported by the
1399  *              host. Strings originate from an AML call to the _OSI method.
1400  *
1401  *****************************************************************************/
1402
1403 acpi_status
1404 acpi_os_validate_interface (char *interface)
1405 {
1406         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1407                 return AE_OK;
1408         if (!strcmp("Linux", interface)) {
1409
1410                 printk(KERN_NOTICE PREFIX
1411                         "BIOS _OSI(Linux) query %s%s\n",
1412                         osi_linux.enable ? "honored" : "ignored",
1413                         osi_linux.cmdline ? " via cmdline" :
1414                         osi_linux.dmi ? " via DMI" : "");
1415
1416                 if (osi_linux.enable)
1417                         return AE_OK;
1418         }
1419         return AE_SUPPORT;
1420 }
1421
1422 static inline int acpi_res_list_add(struct acpi_res_list *res)
1423 {
1424         struct acpi_res_list *res_list_elem;
1425
1426         list_for_each_entry(res_list_elem, &resource_list_head,
1427                             resource_list) {
1428
1429                 if (res->resource_type == res_list_elem->resource_type &&
1430                     res->start == res_list_elem->start &&
1431                     res->end == res_list_elem->end) {
1432
1433                         /*
1434                          * The Region(addr,len) already exist in the list,
1435                          * just increase the count
1436                          */
1437
1438                         res_list_elem->count++;
1439                         return 0;
1440                 }
1441         }
1442
1443         res->count = 1;
1444         list_add(&res->resource_list, &resource_list_head);
1445         return 1;
1446 }
1447
1448 static inline void acpi_res_list_del(struct acpi_res_list *res)
1449 {
1450         struct acpi_res_list *res_list_elem;
1451
1452         list_for_each_entry(res_list_elem, &resource_list_head,
1453                             resource_list) {
1454
1455                 if (res->resource_type == res_list_elem->resource_type &&
1456                     res->start == res_list_elem->start &&
1457                     res->end == res_list_elem->end) {
1458
1459                         /*
1460                          * If the res count is decreased to 0,
1461                          * remove and free it
1462                          */
1463
1464                         if (--res_list_elem->count == 0) {
1465                                 list_del(&res_list_elem->resource_list);
1466                                 kfree(res_list_elem);
1467                         }
1468                         return;
1469                 }
1470         }
1471 }
1472
1473 acpi_status
1474 acpi_os_invalidate_address(
1475     u8                   space_id,
1476     acpi_physical_address   address,
1477     acpi_size               length)
1478 {
1479         struct acpi_res_list res;
1480
1481         switch (space_id) {
1482         case ACPI_ADR_SPACE_SYSTEM_IO:
1483         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1484                 /* Only interference checks against SystemIO and SystemMemory
1485                    are needed */
1486                 res.start = address;
1487                 res.end = address + length - 1;
1488                 res.resource_type = space_id;
1489                 spin_lock(&acpi_res_lock);
1490                 acpi_res_list_del(&res);
1491                 spin_unlock(&acpi_res_lock);
1492                 break;
1493         case ACPI_ADR_SPACE_PCI_CONFIG:
1494         case ACPI_ADR_SPACE_EC:
1495         case ACPI_ADR_SPACE_SMBUS:
1496         case ACPI_ADR_SPACE_CMOS:
1497         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1498         case ACPI_ADR_SPACE_DATA_TABLE:
1499         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1500                 break;
1501         }
1502         return AE_OK;
1503 }
1504
1505 /******************************************************************************
1506  *
1507  * FUNCTION:    acpi_os_validate_address
1508  *
1509  * PARAMETERS:  space_id             - ACPI space ID
1510  *              address             - Physical address
1511  *              length              - Address length
1512  *
1513  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1514  *              should return AE_AML_ILLEGAL_ADDRESS.
1515  *
1516  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1517  *              the addresses accessed by AML operation regions.
1518  *
1519  *****************************************************************************/
1520
1521 acpi_status
1522 acpi_os_validate_address (
1523     u8                   space_id,
1524     acpi_physical_address   address,
1525     acpi_size               length,
1526     char *name)
1527 {
1528         struct acpi_res_list *res;
1529         int added;
1530         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1531                 return AE_OK;
1532
1533         switch (space_id) {
1534         case ACPI_ADR_SPACE_SYSTEM_IO:
1535         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1536                 /* Only interference checks against SystemIO and SystemMemory
1537                    are needed */
1538                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1539                 if (!res)
1540                         return AE_OK;
1541                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1542                 strlcpy(res->name, name, 5);
1543                 res->start = address;
1544                 res->end = address + length - 1;
1545                 res->resource_type = space_id;
1546                 spin_lock(&acpi_res_lock);
1547                 added = acpi_res_list_add(res);
1548                 spin_unlock(&acpi_res_lock);
1549                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1550                          "name: %s\n", added ? "Added" : "Already exist",
1551                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1552                          ? "SystemIO" : "System Memory",
1553                          (unsigned long long)res->start,
1554                          (unsigned long long)res->end,
1555                          res->name);
1556                 if (!added)
1557                         kfree(res);
1558                 break;
1559         case ACPI_ADR_SPACE_PCI_CONFIG:
1560         case ACPI_ADR_SPACE_EC:
1561         case ACPI_ADR_SPACE_SMBUS:
1562         case ACPI_ADR_SPACE_CMOS:
1563         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1564         case ACPI_ADR_SPACE_DATA_TABLE:
1565         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1566                 break;
1567         }
1568         return AE_OK;
1569 }
1570 #endif
1571
1572 acpi_status __init acpi_os_initialize(void)
1573 {
1574         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1575         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1576         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1577         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1578
1579         return AE_OK;
1580 }
1581
1582 acpi_status acpi_os_initialize1(void)
1583 {
1584         kacpid_wq = create_workqueue("kacpid");
1585         kacpi_notify_wq = create_workqueue("kacpi_notify");
1586         kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
1587         BUG_ON(!kacpid_wq);
1588         BUG_ON(!kacpi_notify_wq);
1589         BUG_ON(!kacpi_hotplug_wq);
1590         return AE_OK;
1591 }
1592
1593 acpi_status acpi_os_terminate(void)
1594 {
1595         if (acpi_irq_handler) {
1596                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
1597                                                  acpi_irq_handler);
1598         }
1599
1600         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1601         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1602         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1603         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1604
1605         destroy_workqueue(kacpid_wq);
1606         destroy_workqueue(kacpi_notify_wq);
1607         destroy_workqueue(kacpi_hotplug_wq);
1608
1609         return AE_OK;
1610 }