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/acpi_io.h>
  42 #include <linux/efi.h>
  43 #include <linux/ioport.h>
  44 #include <linux/list.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/semaphore.h>
  47
  48 #include <asm/io.h>
  49 #include <asm/uaccess.h>
  50
  51 #include <acpi/acpi.h>
  52 #include <acpi/acpi_bus.h>
  53 #include <acpi/processor.h>
  54
  55 #define _COMPONENT              ACPI_OS_SERVICES
  56 ACPI_MODULE_NAME("osl");
  57 #define PREFIX          "ACPI: "
  58 struct acpi_os_dpc {
  59         acpi_osd_exec_callback function;
  60         void *context;
  61         struct work_struct work;
  62         int wait;
  63 };
  64
  65 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  67 #endif
  68
  69 #ifdef ENABLE_DEBUGGER
  70 #include <linux/kdb.h>
  71
  72 /* stuff for debugger support */
  73 int acpi_in_debugger;
  74 EXPORT_SYMBOL(acpi_in_debugger);
  75
  76 extern char line_buf[80];
  77 #endif                          /*ENABLE_DEBUGGER */
  78
  79 static acpi_osd_handler acpi_irq_handler;
  80 static void *acpi_irq_context;
  81 static struct workqueue_struct *kacpid_wq;
  82 static struct workqueue_struct *kacpi_notify_wq;
  83 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         unsigned long refcount;
 108 };
 109
 110 static LIST_HEAD(acpi_ioremaps);
 111 static DEFINE_MUTEX(acpi_ioremap_lock);
 112
 113 static void __init acpi_osi_setup_late(void);
 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 } osi_linux = {0, 0, 0};
 153
 154 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 155 {
 156         if (!strcmp("Linux", interface)) {
 157
 158                 printk(KERN_NOTICE FW_BUG PREFIX
 159                         "BIOS _OSI(Linux) query %s%s\n",
 160                         osi_linux.enable ? "honored" : "ignored",
 161                         osi_linux.cmdline ? " via cmdline" :
 162                         osi_linux.dmi ? " via DMI" : "");
 163         }
 164
 165         return supported;
 166 }
 167
 168 static void __init acpi_request_region (struct acpi_generic_address *addr,
 169         unsigned int length, char *desc)
 170 {
 171         if (!addr->address || !length)
 172                 return;
 173
 174         /* Resources are never freed */
 175         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 176                 request_region(addr->address, length, desc);
 177         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 178                 request_mem_region(addr->address, length, desc);
 179 }
 180
 181 static int __init acpi_reserve_resources(void)
 182 {
 183         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 184                 "ACPI PM1a_EVT_BLK");
 185
 186         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 187                 "ACPI PM1b_EVT_BLK");
 188
 189         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 190                 "ACPI PM1a_CNT_BLK");
 191
 192         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 193                 "ACPI PM1b_CNT_BLK");
 194
 195         if (acpi_gbl_FADT.pm_timer_length == 4)
 196                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 197
 198         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 199                 "ACPI PM2_CNT_BLK");
 200
 201         /* Length of GPE blocks must be a non-negative multiple of 2 */
 202
 203         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 204                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 205                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 206
 207         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 208                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 209                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 210
 211         return 0;
 212 }
 213 device_initcall(acpi_reserve_resources);
 214
 215 void acpi_os_printf(const char *fmt, ...)
 216 {
 217         va_list args;
 218         va_start(args, fmt);
 219         acpi_os_vprintf(fmt, args);
 220         va_end(args);
 221 }
 222
 223 void acpi_os_vprintf(const char *fmt, va_list args)
 224 {
 225         static char buffer[512];
 226
 227         vsprintf(buffer, fmt, args);
 228
 229 #ifdef ENABLE_DEBUGGER
 230         if (acpi_in_debugger) {
 231                 kdb_printf("%s", buffer);
 232         } else {
 233                 printk(KERN_CONT "%s", buffer);
 234         }
 235 #else
 236         printk(KERN_CONT "%s", buffer);
 237 #endif
 238 }
 239
 240 acpi_physical_address __init acpi_os_get_root_pointer(void)
 241 {
 242         if (efi_enabled) {
 243                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 244                         return efi.acpi20;
 245                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 246                         return efi.acpi;
 247                 else {
 248                         printk(KERN_ERR PREFIX
 249                                "System description tables not found\n");
 250                         return 0;
 251                 }
 252         } else {
 253                 acpi_physical_address pa = 0;
 254
 255                 acpi_find_root_pointer(&pa);
 256                 return pa;
 257         }
 258 }
 259
 260 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 261 static struct acpi_ioremap *
 262 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 263 {
 264         struct acpi_ioremap *map;
 265
 266         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 267                 if (map->phys <= phys &&
 268                     phys + size <= map->phys + map->size)
 269                         return map;
 270
 271         return NULL;
 272 }
 273
 274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 275 static void __iomem *
 276 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 277 {
 278         struct acpi_ioremap *map;
 279
 280         map = acpi_map_lookup(phys, size);
 281         if (map)
 282                 return map->virt + (phys - map->phys);
 283
 284         return NULL;
 285 }
 286
 287 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 288 {
 289         struct acpi_ioremap *map;
 290         void __iomem *virt = NULL;
 291
 292         mutex_lock(&acpi_ioremap_lock);
 293         map = acpi_map_lookup(phys, size);
 294         if (map) {
 295                 virt = map->virt + (phys - map->phys);
 296                 map->refcount++;
 297         }
 298         mutex_unlock(&acpi_ioremap_lock);
 299         return virt;
 300 }
 301 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 302
 303 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 304 static struct acpi_ioremap *
 305 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 306 {
 307         struct acpi_ioremap *map;
 308
 309         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 310                 if (map->virt <= virt &&
 311                     virt + size <= map->virt + map->size)
 312                         return map;
 313
 314         return NULL;
 315 }
 316
 317 void __iomem *__init_refok
 318 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 319 {
 320         struct acpi_ioremap *map;
 321         void __iomem *virt;
 322         acpi_physical_address pg_off;
 323         acpi_size pg_sz;
 324
 325         if (phys > ULONG_MAX) {
 326                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 327                 return NULL;
 328         }
 329
 330         if (!acpi_gbl_permanent_mmap)
 331                 return __acpi_map_table((unsigned long)phys, size);
 332
 333         mutex_lock(&acpi_ioremap_lock);
 334         /* Check if there's a suitable mapping already. */
 335         map = acpi_map_lookup(phys, size);
 336         if (map) {
 337                 map->refcount++;
 338                 goto out;
 339         }
 340
 341         map = kzalloc(sizeof(*map), GFP_KERNEL);
 342         if (!map) {
 343                 mutex_unlock(&acpi_ioremap_lock);
 344                 return NULL;
 345         }
 346
 347         pg_off = round_down(phys, PAGE_SIZE);
 348         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 349         virt = acpi_os_ioremap(pg_off, pg_sz);
 350         if (!virt) {
 351                 mutex_unlock(&acpi_ioremap_lock);
 352                 kfree(map);
 353                 return NULL;
 354         }
 355
 356         INIT_LIST_HEAD(&map->list);
 357         map->virt = virt;
 358         map->phys = pg_off;
 359         map->size = pg_sz;
 360         map->refcount = 1;
 361
 362         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 363
 364  out:
 365         mutex_unlock(&acpi_ioremap_lock);
 366         return map->virt + (phys - map->phys);
 367 }
 368 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 369
 370 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 371 {
 372         if (!--map->refcount)
 373                 list_del_rcu(&map->list);
 374 }
 375
 376 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 377 {
 378         if (!map->refcount) {
 379                 synchronize_rcu();
 380                 iounmap(map->virt);
 381                 kfree(map);
 382         }
 383 }
 384
 385 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 386 {
 387         struct acpi_ioremap *map;
 388
 389         if (!acpi_gbl_permanent_mmap) {
 390                 __acpi_unmap_table(virt, size);
 391                 return;
 392         }
 393
 394         mutex_lock(&acpi_ioremap_lock);
 395         map = acpi_map_lookup_virt(virt, size);
 396         if (!map) {
 397                 mutex_unlock(&acpi_ioremap_lock);
 398                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 399                 return;
 400         }
 401         acpi_os_drop_map_ref(map);
 402         mutex_unlock(&acpi_ioremap_lock);
 403
 404         acpi_os_map_cleanup(map);
 405 }
 406 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 407
 408 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 409 {
 410         if (!acpi_gbl_permanent_mmap)
 411                 __acpi_unmap_table(virt, size);
 412 }
 413
 414 static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 415 {
 416         void __iomem *virt;
 417
 418         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 419                 return 0;
 420
 421         if (!addr->address || !addr->bit_width)
 422                 return -EINVAL;
 423
 424         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 425         if (!virt)
 426                 return -EIO;
 427
 428         return 0;
 429 }
 430
 431 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 432 {
 433         struct acpi_ioremap *map;
 434
 435         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 436                 return;
 437
 438         if (!addr->address || !addr->bit_width)
 439                 return;
 440
 441         mutex_lock(&acpi_ioremap_lock);
 442         map = acpi_map_lookup(addr->address, addr->bit_width / 8);
 443         if (!map) {
 444                 mutex_unlock(&acpi_ioremap_lock);
 445                 return;
 446         }
 447         acpi_os_drop_map_ref(map);
 448         mutex_unlock(&acpi_ioremap_lock);
 449
 450         acpi_os_map_cleanup(map);
 451 }
 452
 453 #ifdef ACPI_FUTURE_USAGE
 454 acpi_status
 455 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 456 {
 457         if (!phys || !virt)
 458                 return AE_BAD_PARAMETER;
 459
 460         *phys = virt_to_phys(virt);
 461
 462         return AE_OK;
 463 }
 464 #endif
 465
 466 #define ACPI_MAX_OVERRIDE_LEN 100
 467
 468 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 469
 470 acpi_status
 471 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 472                             acpi_string * new_val)
 473 {
 474         if (!init_val || !new_val)
 475                 return AE_BAD_PARAMETER;
 476
 477         *new_val = NULL;
 478         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 479                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 480                        acpi_os_name);
 481                 *new_val = acpi_os_name;
 482         }
 483
 484         return AE_OK;
 485 }
 486
 487 acpi_status
 488 acpi_os_table_override(struct acpi_table_header * existing_table,
 489                        struct acpi_table_header ** new_table)
 490 {
 491         if (!existing_table || !new_table)
 492                 return AE_BAD_PARAMETER;
 493
 494         *new_table = NULL;
 495
 496 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 497         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 498                 *new_table = (struct acpi_table_header *)AmlCode;
 499 #endif
 500         if (*new_table != NULL) {
 501                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 502                            "this is unsafe: tainting kernel\n",
 503                        existing_table->signature,
 504                        existing_table->oem_table_id);
 505                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 506         }
 507         return AE_OK;
 508 }
 509
 510 static irqreturn_t acpi_irq(int irq, void *dev_id)
 511 {
 512         u32 handled;
 513
 514         handled = (*acpi_irq_handler) (acpi_irq_context);
 515
 516         if (handled) {
 517                 acpi_irq_handled++;
 518                 return IRQ_HANDLED;
 519         } else {
 520                 acpi_irq_not_handled++;
 521                 return IRQ_NONE;
 522         }
 523 }
 524
 525 acpi_status
 526 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 527                                   void *context)
 528 {
 529         unsigned int irq;
 530
 531         acpi_irq_stats_init();
 532
 533         /*
 534          * ACPI interrupts different from the SCI in our copy of the FADT are
 535          * not supported.
 536          */
 537         if (gsi != acpi_gbl_FADT.sci_interrupt)
 538                 return AE_BAD_PARAMETER;
 539
 540         if (acpi_irq_handler)
 541                 return AE_ALREADY_ACQUIRED;
 542
 543         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 544                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 545                        gsi);
 546                 return AE_OK;
 547         }
 548
 549         acpi_irq_handler = handler;
 550         acpi_irq_context = context;
 551         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 552                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 553                 acpi_irq_handler = NULL;
 554                 return AE_NOT_ACQUIRED;
 555         }
 556
 557         return AE_OK;
 558 }
 559
 560 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 561 {
 562         if (irq != acpi_gbl_FADT.sci_interrupt)
 563                 return AE_BAD_PARAMETER;
 564
 565         free_irq(irq, acpi_irq);
 566         acpi_irq_handler = NULL;
 567
 568         return AE_OK;
 569 }
 570
 571 /*
 572  * Running in interpreter thread context, safe to sleep
 573  */
 574
 575 void acpi_os_sleep(u64 ms)
 576 {
 577         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 578 }
 579
 580 void acpi_os_stall(u32 us)
 581 {
 582         while (us) {
 583                 u32 delay = 1000;
 584
 585                 if (delay > us)
 586                         delay = us;
 587                 udelay(delay);
 588                 touch_nmi_watchdog();
 589                 us -= delay;
 590         }
 591 }
 592
 593 /*
 594  * Support ACPI 3.0 AML Timer operand
 595  * Returns 64-bit free-running, monotonically increasing timer
 596  * with 100ns granularity
 597  */
 598 u64 acpi_os_get_timer(void)
 599 {
 600         static u64 t;
 601
 602 #ifdef  CONFIG_HPET
 603         /* TBD: use HPET if available */
 604 #endif
 605
 606 #ifdef  CONFIG_X86_PM_TIMER
 607         /* TBD: default to PM timer if HPET was not available */
 608 #endif
 609         if (!t)
 610                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 611
 612         return ++t;
 613 }
 614
 615 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 616 {
 617         u32 dummy;
 618
 619         if (!value)
 620                 value = &dummy;
 621
 622         *value = 0;
 623         if (width <= 8) {
 624                 *(u8 *) value = inb(port);
 625         } else if (width <= 16) {
 626                 *(u16 *) value = inw(port);
 627         } else if (width <= 32) {
 628                 *(u32 *) value = inl(port);
 629         } else {
 630                 BUG();
 631         }
 632
 633         return AE_OK;
 634 }
 635
 636 EXPORT_SYMBOL(acpi_os_read_port);
 637
 638 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 639 {
 640         if (width <= 8) {
 641                 outb(value, port);
 642         } else if (width <= 16) {
 643                 outw(value, port);
 644         } else if (width <= 32) {
 645                 outl(value, port);
 646         } else {
 647                 BUG();
 648         }
 649
 650         return AE_OK;
 651 }
 652
 653 EXPORT_SYMBOL(acpi_os_write_port);
 654
 655 acpi_status
 656 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 657 {
 658         void __iomem *virt_addr;
 659         unsigned int size = width / 8;
 660         bool unmap = false;
 661         u32 dummy;
 662
 663         rcu_read_lock();
 664         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 665         if (!virt_addr) {
 666                 rcu_read_unlock();
 667                 virt_addr = acpi_os_ioremap(phys_addr, size);
 668                 if (!virt_addr)
 669                         return AE_BAD_ADDRESS;
 670                 unmap = true;
 671         }
 672
 673         if (!value)
 674                 value = &dummy;
 675
 676         switch (width) {
 677         case 8:
 678                 *(u8 *) value = readb(virt_addr);
 679                 break;
 680         case 16:
 681                 *(u16 *) value = readw(virt_addr);
 682                 break;
 683         case 32:
 684                 *(u32 *) value = readl(virt_addr);
 685                 break;
 686         default:
 687                 BUG();
 688         }
 689
 690         if (unmap)
 691                 iounmap(virt_addr);
 692         else
 693                 rcu_read_unlock();
 694
 695         return AE_OK;
 696 }
 697
 698 acpi_status
 699 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 700 {
 701         void __iomem *virt_addr;
 702         unsigned int size = width / 8;
 703         bool unmap = false;
 704
 705         rcu_read_lock();
 706         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 707         if (!virt_addr) {
 708                 rcu_read_unlock();
 709                 virt_addr = acpi_os_ioremap(phys_addr, size);
 710                 if (!virt_addr)
 711                         return AE_BAD_ADDRESS;
 712                 unmap = true;
 713         }
 714
 715         switch (width) {
 716         case 8:
 717                 writeb(value, virt_addr);
 718                 break;
 719         case 16:
 720                 writew(value, virt_addr);
 721                 break;
 722         case 32:
 723                 writel(value, virt_addr);
 724                 break;
 725         default:
 726                 BUG();
 727         }
 728
 729         if (unmap)
 730                 iounmap(virt_addr);
 731         else
 732                 rcu_read_unlock();
 733
 734         return AE_OK;
 735 }
 736
 737 acpi_status
 738 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 739                                u64 *value, u32 width)
 740 {
 741         int result, size;
 742         u32 value32;
 743
 744         if (!value)
 745                 return AE_BAD_PARAMETER;
 746
 747         switch (width) {
 748         case 8:
 749                 size = 1;
 750                 break;
 751         case 16:
 752                 size = 2;
 753                 break;
 754         case 32:
 755                 size = 4;
 756                 break;
 757         default:
 758                 return AE_ERROR;
 759         }
 760
 761         result = raw_pci_read(pci_id->segment, pci_id->bus,
 762                                 PCI_DEVFN(pci_id->device, pci_id->function),
 763                                 reg, size, &value32);
 764         *value = value32;
 765
 766         return (result ? AE_ERROR : AE_OK);
 767 }
 768
 769 acpi_status
 770 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 771                                 u64 value, u32 width)
 772 {
 773         int result, size;
 774
 775         switch (width) {
 776         case 8:
 777                 size = 1;
 778                 break;
 779         case 16:
 780                 size = 2;
 781                 break;
 782         case 32:
 783                 size = 4;
 784                 break;
 785         default:
 786                 return AE_ERROR;
 787         }
 788
 789         result = raw_pci_write(pci_id->segment, pci_id->bus,
 790                                 PCI_DEVFN(pci_id->device, pci_id->function),
 791                                 reg, size, value);
 792
 793         return (result ? AE_ERROR : AE_OK);
 794 }
 795
 796 static void acpi_os_execute_deferred(struct work_struct *work)
 797 {
 798         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 799
 800         if (dpc->wait)
 801                 acpi_os_wait_events_complete(NULL);
 802
 803         dpc->function(dpc->context);
 804         kfree(dpc);
 805 }
 806
 807 /*******************************************************************************
 808  *
 809  * FUNCTION:    acpi_os_execute
 810  *
 811  * PARAMETERS:  Type               - Type of the callback
 812  *              Function           - Function to be executed
 813  *              Context            - Function parameters
 814  *
 815  * RETURN:      Status
 816  *
 817  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 818  *              immediately executes function on a separate thread.
 819  *
 820  ******************************************************************************/
 821
 822 static acpi_status __acpi_os_execute(acpi_execute_type type,
 823         acpi_osd_exec_callback function, void *context, int hp)
 824 {
 825         acpi_status status = AE_OK;
 826         struct acpi_os_dpc *dpc;
 827         struct workqueue_struct *queue;
 828         int ret;
 829         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 830                           "Scheduling function [%p(%p)] for deferred execution.\n",
 831                           function, context));
 832
 833         /*
 834          * Allocate/initialize DPC structure.  Note that this memory will be
 835          * freed by the callee.  The kernel handles the work_struct list  in a
 836          * way that allows us to also free its memory inside the callee.
 837          * Because we may want to schedule several tasks with different
 838          * parameters we can't use the approach some kernel code uses of
 839          * having a static work_struct.
 840          */
 841
 842         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 843         if (!dpc)
 844                 return AE_NO_MEMORY;
 845
 846         dpc->function = function;
 847         dpc->context = context;
 848
 849         /*
 850          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 851          * because the hotplug code may call driver .remove() functions,
 852          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 853          * to flush these workqueues.
 854          */
 855         queue = hp ? kacpi_hotplug_wq :
 856                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 857         dpc->wait = hp ? 1 : 0;
 858
 859         if (queue == kacpi_hotplug_wq)
 860                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 861         else if (queue == kacpi_notify_wq)
 862                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 863         else
 864                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 865
 866         /*
 867          * On some machines, a software-initiated SMI causes corruption unless
 868          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 869          * typically it's done in GPE-related methods that are run via
 870          * workqueues, so we can avoid the known corruption cases by always
 871          * queueing on CPU 0.
 872          */
 873         ret = queue_work_on(0, queue, &dpc->work);
 874
 875         if (!ret) {
 876                 printk(KERN_ERR PREFIX
 877                           "Call to queue_work() failed.\n");
 878                 status = AE_ERROR;
 879                 kfree(dpc);
 880         }
 881         return status;
 882 }
 883
 884 acpi_status acpi_os_execute(acpi_execute_type type,
 885                             acpi_osd_exec_callback function, void *context)
 886 {
 887         return __acpi_os_execute(type, function, context, 0);
 888 }
 889 EXPORT_SYMBOL(acpi_os_execute);
 890
 891 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 892         void *context)
 893 {
 894         return __acpi_os_execute(0, function, context, 1);
 895 }
 896
 897 void acpi_os_wait_events_complete(void *context)
 898 {
 899         flush_workqueue(kacpid_wq);
 900         flush_workqueue(kacpi_notify_wq);
 901 }
 902
 903 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 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 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1079 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1080
1081 struct osi_setup_entry {
1082         char string[OSI_STRING_LENGTH_MAX];
1083         bool enable;
1084 };
1085
1086 static struct osi_setup_entry __initdata osi_setup_entries[OSI_STRING_ENTRIES_MAX];
1087
1088 void __init acpi_osi_setup(char *str)
1089 {
1090         struct osi_setup_entry *osi;
1091         bool enable = true;
1092         int i;
1093
1094         if (!acpi_gbl_create_osi_method)
1095                 return;
1096
1097         if (str == NULL || *str == '\0') {
1098                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1099                 acpi_gbl_create_osi_method = FALSE;
1100                 return;
1101         }
1102
1103         if (*str == '!') {
1104                 str++;
1105                 enable = false;
1106         }
1107
1108         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1109                 osi = &osi_setup_entries[i];
1110                 if (!strcmp(osi->string, str)) {
1111                         osi->enable = enable;
1112                         break;
1113                 } else if (osi->string[0] == '\0') {
1114                         osi->enable = enable;
1115                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1116                         break;
1117                 }
1118         }
1119 }
1120
1121 static void __init set_osi_linux(unsigned int enable)
1122 {
1123         if (osi_linux.enable != enable)
1124                 osi_linux.enable = enable;
1125
1126         if (osi_linux.enable)
1127                 acpi_osi_setup("Linux");
1128         else
1129                 acpi_osi_setup("!Linux");
1130
1131         return;
1132 }
1133
1134 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1135 {
1136         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1137         osi_linux.dmi = 0;
1138         set_osi_linux(enable);
1139
1140         return;
1141 }
1142
1143 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1144 {
1145         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1146
1147         if (enable == -1)
1148                 return;
1149
1150         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1151         set_osi_linux(enable);
1152
1153         return;
1154 }
1155
1156 /*
1157  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1158  *
1159  * empty string disables _OSI
1160  * string starting with '!' disables that string
1161  * otherwise string is added to list, augmenting built-in strings
1162  */
1163 static void __init acpi_osi_setup_late(void)
1164 {
1165         struct osi_setup_entry *osi;
1166         char *str;
1167         int i;
1168         acpi_status status;
1169
1170         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1171                 osi = &osi_setup_entries[i];
1172                 str = osi->string;
1173
1174                 if (*str == '\0')
1175                         break;
1176                 if (osi->enable) {
1177                         status = acpi_install_interface(str);
1178
1179                         if (ACPI_SUCCESS(status))
1180                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1181                 } else {
1182                         status = acpi_remove_interface(str);
1183
1184                         if (ACPI_SUCCESS(status))
1185                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1186                 }
1187         }
1188 }
1189
1190 static int __init osi_setup(char *str)
1191 {
1192         if (str && !strcmp("Linux", str))
1193                 acpi_cmdline_osi_linux(1);
1194         else if (str && !strcmp("!Linux", str))
1195                 acpi_cmdline_osi_linux(0);
1196         else
1197                 acpi_osi_setup(str);
1198
1199         return 1;
1200 }
1201
1202 __setup("acpi_osi=", osi_setup);
1203
1204 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1205 static int __init acpi_serialize_setup(char *str)
1206 {
1207         printk(KERN_INFO PREFIX "serialize enabled\n");
1208
1209         acpi_gbl_all_methods_serialized = TRUE;
1210
1211         return 1;
1212 }
1213
1214 __setup("acpi_serialize", acpi_serialize_setup);
1215
1216 /* Check of resource interference between native drivers and ACPI
1217  * OperationRegions (SystemIO and System Memory only).
1218  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1219  * in arbitrary AML code and can interfere with legacy drivers.
1220  * acpi_enforce_resources= can be set to:
1221  *
1222  *   - strict (default) (2)
1223  *     -> further driver trying to access the resources will not load
1224  *   - lax              (1)
1225  *     -> further driver trying to access the resources will load, but you
1226  *     get a system message that something might go wrong...
1227  *
1228  *   - no               (0)
1229  *     -> ACPI Operation Region resources will not be registered
1230  *
1231  */
1232 #define ENFORCE_RESOURCES_STRICT 2
1233 #define ENFORCE_RESOURCES_LAX    1
1234 #define ENFORCE_RESOURCES_NO     0
1235
1236 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1237
1238 static int __init acpi_enforce_resources_setup(char *str)
1239 {
1240         if (str == NULL || *str == '\0')
1241                 return 0;
1242
1243         if (!strcmp("strict", str))
1244                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1245         else if (!strcmp("lax", str))
1246                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1247         else if (!strcmp("no", str))
1248                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1249
1250         return 1;
1251 }
1252
1253 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1254
1255 /* Check for resource conflicts between ACPI OperationRegions and native
1256  * drivers */
1257 int acpi_check_resource_conflict(const struct resource *res)
1258 {
1259         struct acpi_res_list *res_list_elem;
1260         int ioport = 0, clash = 0;
1261
1262         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1263                 return 0;
1264         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1265                 return 0;
1266
1267         ioport = res->flags & IORESOURCE_IO;
1268
1269         spin_lock(&acpi_res_lock);
1270         list_for_each_entry(res_list_elem, &resource_list_head,
1271                             resource_list) {
1272                 if (ioport && (res_list_elem->resource_type
1273                                != ACPI_ADR_SPACE_SYSTEM_IO))
1274                         continue;
1275                 if (!ioport && (res_list_elem->resource_type
1276                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1277                         continue;
1278
1279                 if (res->end < res_list_elem->start
1280                     || res_list_elem->end < res->start)
1281                         continue;
1282                 clash = 1;
1283                 break;
1284         }
1285         spin_unlock(&acpi_res_lock);
1286
1287         if (clash) {
1288                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1289                         printk(KERN_WARNING "ACPI: resource %s %pR"
1290                                " conflicts with ACPI region %s "
1291                                "[%s 0x%zx-0x%zx]\n",
1292                                res->name, res, res_list_elem->name,
1293                                (res_list_elem->resource_type ==
1294                                 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1295                                (size_t) res_list_elem->start,
1296                                (size_t) res_list_elem->end);
1297                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1298                                 printk(KERN_NOTICE "ACPI: This conflict may"
1299                                        " cause random problems and system"
1300                                        " instability\n");
1301                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1302                                " for this device, you should use it instead of"
1303                                " the native driver\n");
1304                 }
1305                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1306                         return -EBUSY;
1307         }
1308         return 0;
1309 }
1310 EXPORT_SYMBOL(acpi_check_resource_conflict);
1311
1312 int acpi_check_region(resource_size_t start, resource_size_t n,
1313                       const char *name)
1314 {
1315         struct resource res = {
1316                 .start = start,
1317                 .end   = start + n - 1,
1318                 .name  = name,
1319                 .flags = IORESOURCE_IO,
1320         };
1321
1322         return acpi_check_resource_conflict(&res);
1323 }
1324 EXPORT_SYMBOL(acpi_check_region);
1325
1326 /*
1327  * Let drivers know whether the resource checks are effective
1328  */
1329 int acpi_resources_are_enforced(void)
1330 {
1331         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1332 }
1333 EXPORT_SYMBOL(acpi_resources_are_enforced);
1334
1335 /*
1336  * Deallocate the memory for a spinlock.
1337  */
1338 void acpi_os_delete_lock(acpi_spinlock handle)
1339 {
1340         ACPI_FREE(handle);
1341 }
1342
1343 /*
1344  * Acquire a spinlock.
1345  *
1346  * handle is a pointer to the spinlock_t.
1347  */
1348
1349 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1350 {
1351         acpi_cpu_flags flags;
1352         spin_lock_irqsave(lockp, flags);
1353         return flags;
1354 }
1355
1356 /*
1357  * Release a spinlock. See above.
1358  */
1359
1360 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1361 {
1362         spin_unlock_irqrestore(lockp, flags);
1363 }
1364
1365 #ifndef ACPI_USE_LOCAL_CACHE
1366
1367 /*******************************************************************************
1368  *
1369  * FUNCTION:    acpi_os_create_cache
1370  *
1371  * PARAMETERS:  name      - Ascii name for the cache
1372  *              size      - Size of each cached object
1373  *              depth     - Maximum depth of the cache (in objects) <ignored>
1374  *              cache     - Where the new cache object is returned
1375  *
1376  * RETURN:      status
1377  *
1378  * DESCRIPTION: Create a cache object
1379  *
1380  ******************************************************************************/
1381
1382 acpi_status
1383 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1384 {
1385         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1386         if (*cache == NULL)
1387                 return AE_ERROR;
1388         else
1389                 return AE_OK;
1390 }
1391
1392 /*******************************************************************************
1393  *
1394  * FUNCTION:    acpi_os_purge_cache
1395  *
1396  * PARAMETERS:  Cache           - Handle to cache object
1397  *
1398  * RETURN:      Status
1399  *
1400  * DESCRIPTION: Free all objects within the requested cache.
1401  *
1402  ******************************************************************************/
1403
1404 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1405 {
1406         kmem_cache_shrink(cache);
1407         return (AE_OK);
1408 }
1409
1410 /*******************************************************************************
1411  *
1412  * FUNCTION:    acpi_os_delete_cache
1413  *
1414  * PARAMETERS:  Cache           - Handle to cache object
1415  *
1416  * RETURN:      Status
1417  *
1418  * DESCRIPTION: Free all objects within the requested cache and delete the
1419  *              cache object.
1420  *
1421  ******************************************************************************/
1422
1423 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1424 {
1425         kmem_cache_destroy(cache);
1426         return (AE_OK);
1427 }
1428
1429 /*******************************************************************************
1430  *
1431  * FUNCTION:    acpi_os_release_object
1432  *
1433  * PARAMETERS:  Cache       - Handle to cache object
1434  *              Object      - The object to be released
1435  *
1436  * RETURN:      None
1437  *
1438  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1439  *              the object is deleted.
1440  *
1441  ******************************************************************************/
1442
1443 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1444 {
1445         kmem_cache_free(cache, object);
1446         return (AE_OK);
1447 }
1448
1449 static inline int acpi_res_list_add(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                          * The Region(addr,len) already exist in the list,
1462                          * just increase the count
1463                          */
1464
1465                         res_list_elem->count++;
1466                         return 0;
1467                 }
1468         }
1469
1470         res->count = 1;
1471         list_add(&res->resource_list, &resource_list_head);
1472         return 1;
1473 }
1474
1475 static inline void acpi_res_list_del(struct acpi_res_list *res)
1476 {
1477         struct acpi_res_list *res_list_elem;
1478
1479         list_for_each_entry(res_list_elem, &resource_list_head,
1480                             resource_list) {
1481
1482                 if (res->resource_type == res_list_elem->resource_type &&
1483                     res->start == res_list_elem->start &&
1484                     res->end == res_list_elem->end) {
1485
1486                         /*
1487                          * If the res count is decreased to 0,
1488                          * remove and free it
1489                          */
1490
1491                         if (--res_list_elem->count == 0) {
1492                                 list_del(&res_list_elem->resource_list);
1493                                 kfree(res_list_elem);
1494                         }
1495                         return;
1496                 }
1497         }
1498 }
1499
1500 acpi_status
1501 acpi_os_invalidate_address(
1502     u8                   space_id,
1503     acpi_physical_address   address,
1504     acpi_size               length)
1505 {
1506         struct acpi_res_list res;
1507
1508         switch (space_id) {
1509         case ACPI_ADR_SPACE_SYSTEM_IO:
1510         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1511                 /* Only interference checks against SystemIO and SystemMemory
1512                    are needed */
1513                 res.start = address;
1514                 res.end = address + length - 1;
1515                 res.resource_type = space_id;
1516                 spin_lock(&acpi_res_lock);
1517                 acpi_res_list_del(&res);
1518                 spin_unlock(&acpi_res_lock);
1519                 break;
1520         case ACPI_ADR_SPACE_PCI_CONFIG:
1521         case ACPI_ADR_SPACE_EC:
1522         case ACPI_ADR_SPACE_SMBUS:
1523         case ACPI_ADR_SPACE_CMOS:
1524         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1525         case ACPI_ADR_SPACE_DATA_TABLE:
1526         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1527                 break;
1528         }
1529         return AE_OK;
1530 }
1531
1532 /******************************************************************************
1533  *
1534  * FUNCTION:    acpi_os_validate_address
1535  *
1536  * PARAMETERS:  space_id             - ACPI space ID
1537  *              address             - Physical address
1538  *              length              - Address length
1539  *
1540  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1541  *              should return AE_AML_ILLEGAL_ADDRESS.
1542  *
1543  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1544  *              the addresses accessed by AML operation regions.
1545  *
1546  *****************************************************************************/
1547
1548 acpi_status
1549 acpi_os_validate_address (
1550     u8                   space_id,
1551     acpi_physical_address   address,
1552     acpi_size               length,
1553     char *name)
1554 {
1555         struct acpi_res_list *res;
1556         int added;
1557         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1558                 return AE_OK;
1559
1560         switch (space_id) {
1561         case ACPI_ADR_SPACE_SYSTEM_IO:
1562         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1563                 /* Only interference checks against SystemIO and SystemMemory
1564                    are needed */
1565                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1566                 if (!res)
1567                         return AE_OK;
1568                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1569                 strlcpy(res->name, name, 5);
1570                 res->start = address;
1571                 res->end = address + length - 1;
1572                 res->resource_type = space_id;
1573                 spin_lock(&acpi_res_lock);
1574                 added = acpi_res_list_add(res);
1575                 spin_unlock(&acpi_res_lock);
1576                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1577                          "name: %s\n", added ? "Added" : "Already exist",
1578                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1579                          ? "SystemIO" : "System Memory",
1580                          (unsigned long long)res->start,
1581                          (unsigned long long)res->end,
1582                          res->name);
1583                 if (!added)
1584                         kfree(res);
1585                 break;
1586         case ACPI_ADR_SPACE_PCI_CONFIG:
1587         case ACPI_ADR_SPACE_EC:
1588         case ACPI_ADR_SPACE_SMBUS:
1589         case ACPI_ADR_SPACE_CMOS:
1590         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1591         case ACPI_ADR_SPACE_DATA_TABLE:
1592         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1593                 break;
1594         }
1595         return AE_OK;
1596 }
1597 #endif
1598
1599 acpi_status __init acpi_os_initialize(void)
1600 {
1601         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1602         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1603         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1604         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1605
1606         return AE_OK;
1607 }
1608
1609 acpi_status __init acpi_os_initialize1(void)
1610 {
1611         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1612         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1613         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1614         BUG_ON(!kacpid_wq);
1615         BUG_ON(!kacpi_notify_wq);
1616         BUG_ON(!kacpi_hotplug_wq);
1617         acpi_install_interface_handler(acpi_osi_handler);
1618         acpi_osi_setup_late();
1619         return AE_OK;
1620 }
1621
1622 acpi_status acpi_os_terminate(void)
1623 {
1624         if (acpi_irq_handler) {
1625                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1626                                                  acpi_irq_handler);
1627         }
1628
1629         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1630         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1631         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1632         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1633
1634         destroy_workqueue(kacpid_wq);
1635         destroy_workqueue(kacpi_notify_wq);
1636         destroy_workqueue(kacpi_hotplug_wq);
1637
1638         return AE_OK;
1639 }