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 unsigned int acpi_irq_irq;
  80 static acpi_osd_handler acpi_irq_handler;
  81 static void *acpi_irq_context;
  82 static struct workqueue_struct *kacpid_wq;
  83 static struct workqueue_struct *kacpi_notify_wq;
  84 static struct workqueue_struct *kacpi_hotplug_wq;
  85
  86 struct acpi_res_list {
  87         resource_size_t start;
  88         resource_size_t end;
  89         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  90         char name[5];   /* only can have a length of 4 chars, make use of this
  91                            one instead of res->name, no need to kalloc then */
  92         struct list_head resource_list;
  93         int count;
  94 };
  95
  96 static LIST_HEAD(resource_list_head);
  97 static DEFINE_SPINLOCK(acpi_res_lock);
  98
  99 /*
 100  * This list of permanent mappings is for memory that may be accessed from
 101  * interrupt context, where we can't do the ioremap().
 102  */
 103 struct acpi_ioremap {
 104         struct list_head list;
 105         void __iomem *virt;
 106         acpi_physical_address phys;
 107         acpi_size size;
 108         struct kref ref;
 109 };
 110
 111 static LIST_HEAD(acpi_ioremaps);
 112 static DEFINE_SPINLOCK(acpi_ioremap_lock);
 113
 114 static void __init acpi_osi_setup_late(void);
 115
 116 /*
 117  * The story of _OSI(Linux)
 118  *
 119  * From pre-history through Linux-2.6.22,
 120  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 121  *
 122  * Unfortunately, reference BIOS writers got wind of this
 123  * and put OSI(Linux) in their example code, quickly exposing
 124  * this string as ill-conceived and opening the door to
 125  * an un-bounded number of BIOS incompatibilities.
 126  *
 127  * For example, OSI(Linux) was used on resume to re-POST a
 128  * video card on one system, because Linux at that time
 129  * could not do a speedy restore in its native driver.
 130  * But then upon gaining quick native restore capability,
 131  * Linux has no way to tell the BIOS to skip the time-consuming
 132  * POST -- putting Linux at a permanent performance disadvantage.
 133  * On another system, the BIOS writer used OSI(Linux)
 134  * to infer native OS support for IPMI!  On other systems,
 135  * OSI(Linux) simply got in the way of Linux claiming to
 136  * be compatible with other operating systems, exposing
 137  * BIOS issues such as skipped device initialization.
 138  *
 139  * So "Linux" turned out to be a really poor chose of
 140  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 141  *
 142  * BIOS writers should NOT query _OSI(Linux) on future systems.
 143  * Linux will complain on the console when it sees it, and return FALSE.
 144  * To get Linux to return TRUE for your system  will require
 145  * a kernel source update to add a DMI entry,
 146  * or boot with "acpi_osi=Linux"
 147  */
 148
 149 static struct osi_linux {
 150         unsigned int    enable:1;
 151         unsigned int    dmi:1;
 152         unsigned int    cmdline:1;
 153 } osi_linux = {0, 0, 0};
 154
 155 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 156 {
 157         if (!strcmp("Linux", interface)) {
 158
 159                 printk(KERN_NOTICE FW_BUG PREFIX
 160                         "BIOS _OSI(Linux) query %s%s\n",
 161                         osi_linux.enable ? "honored" : "ignored",
 162                         osi_linux.cmdline ? " via cmdline" :
 163                         osi_linux.dmi ? " via DMI" : "");
 164         }
 165
 166         return supported;
 167 }
 168
 169 static void __init acpi_request_region (struct acpi_generic_address *addr,
 170         unsigned int length, char *desc)
 171 {
 172         if (!addr->address || !length)
 173                 return;
 174
 175         /* Resources are never freed */
 176         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 177                 request_region(addr->address, length, desc);
 178         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 179                 request_mem_region(addr->address, length, desc);
 180 }
 181
 182 static int __init acpi_reserve_resources(void)
 183 {
 184         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 185                 "ACPI PM1a_EVT_BLK");
 186
 187         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 188                 "ACPI PM1b_EVT_BLK");
 189
 190         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 191                 "ACPI PM1a_CNT_BLK");
 192
 193         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 194                 "ACPI PM1b_CNT_BLK");
 195
 196         if (acpi_gbl_FADT.pm_timer_length == 4)
 197                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 198
 199         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 200                 "ACPI PM2_CNT_BLK");
 201
 202         /* Length of GPE blocks must be a non-negative multiple of 2 */
 203
 204         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 205                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 206                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 207
 208         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 209                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 210                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 211
 212         return 0;
 213 }
 214 device_initcall(acpi_reserve_resources);
 215
 216 void acpi_os_printf(const char *fmt, ...)
 217 {
 218         va_list args;
 219         va_start(args, fmt);
 220         acpi_os_vprintf(fmt, args);
 221         va_end(args);
 222 }
 223
 224 void acpi_os_vprintf(const char *fmt, va_list args)
 225 {
 226         static char buffer[512];
 227
 228         vsprintf(buffer, fmt, args);
 229
 230 #ifdef ENABLE_DEBUGGER
 231         if (acpi_in_debugger) {
 232                 kdb_printf("%s", buffer);
 233         } else {
 234                 printk(KERN_CONT "%s", buffer);
 235         }
 236 #else
 237         printk(KERN_CONT "%s", buffer);
 238 #endif
 239 }
 240
 241 acpi_physical_address __init acpi_os_get_root_pointer(void)
 242 {
 243         if (efi_enabled) {
 244                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 245                         return efi.acpi20;
 246                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 247                         return efi.acpi;
 248                 else {
 249                         printk(KERN_ERR PREFIX
 250                                "System description tables not found\n");
 251                         return 0;
 252                 }
 253         } else {
 254                 acpi_physical_address pa = 0;
 255
 256                 acpi_find_root_pointer(&pa);
 257                 return pa;
 258         }
 259 }
 260
 261 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 262 static struct acpi_ioremap *
 263 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 264 {
 265         struct acpi_ioremap *map;
 266
 267         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 268                 if (map->phys <= phys &&
 269                     phys + size <= map->phys + map->size)
 270                         return map;
 271
 272         return NULL;
 273 }
 274
 275 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 276 static void __iomem *
 277 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 278 {
 279         struct acpi_ioremap *map;
 280
 281         map = acpi_map_lookup(phys, size);
 282         if (map)
 283                 return map->virt + (phys - map->phys);
 284
 285         return NULL;
 286 }
 287
 288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 289 static struct acpi_ioremap *
 290 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 291 {
 292         struct acpi_ioremap *map;
 293
 294         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 295                 if (map->virt <= virt &&
 296                     virt + size <= map->virt + map->size)
 297                         return map;
 298
 299         return NULL;
 300 }
 301
 302 void __iomem *__init_refok
 303 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 304 {
 305         struct acpi_ioremap *map, *tmp_map;
 306         unsigned long flags;
 307         void __iomem *virt;
 308         acpi_physical_address pg_off;
 309         acpi_size pg_sz;
 310
 311         if (phys > ULONG_MAX) {
 312                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 313                 return NULL;
 314         }
 315
 316         if (!acpi_gbl_permanent_mmap)
 317                 return __acpi_map_table((unsigned long)phys, size);
 318
 319         map = kzalloc(sizeof(*map), GFP_KERNEL);
 320         if (!map)
 321                 return NULL;
 322
 323         pg_off = round_down(phys, PAGE_SIZE);
 324         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 325         virt = acpi_os_ioremap(pg_off, pg_sz);
 326         if (!virt) {
 327                 kfree(map);
 328                 return NULL;
 329         }
 330
 331         INIT_LIST_HEAD(&map->list);
 332         map->virt = virt;
 333         map->phys = pg_off;
 334         map->size = pg_sz;
 335         kref_init(&map->ref);
 336
 337         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 338         /* Check if page has already been mapped. */
 339         tmp_map = acpi_map_lookup(phys, size);
 340         if (tmp_map) {
 341                 kref_get(&tmp_map->ref);
 342                 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 343                 iounmap(map->virt);
 344                 kfree(map);
 345                 return tmp_map->virt + (phys - tmp_map->phys);
 346         }
 347         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 348         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 349
 350         return map->virt + (phys - map->phys);
 351 }
 352 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 353
 354 static void acpi_kref_del_iomap(struct kref *ref)
 355 {
 356         struct acpi_ioremap *map;
 357
 358         map = container_of(ref, struct acpi_ioremap, ref);
 359         list_del_rcu(&map->list);
 360 }
 361
 362 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 363 {
 364         struct acpi_ioremap *map;
 365         unsigned long flags;
 366         int del;
 367
 368         if (!acpi_gbl_permanent_mmap) {
 369                 __acpi_unmap_table(virt, size);
 370                 return;
 371         }
 372
 373         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 374         map = acpi_map_lookup_virt(virt, size);
 375         if (!map) {
 376                 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 377                 printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt);
 378                 dump_stack();
 379                 return;
 380         }
 381
 382         del = kref_put(&map->ref, acpi_kref_del_iomap);
 383         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 384
 385         if (!del)
 386                 return;
 387
 388         synchronize_rcu();
 389         iounmap(map->virt);
 390         kfree(map);
 391 }
 392 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 393
 394 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 395 {
 396         if (!acpi_gbl_permanent_mmap)
 397                 __acpi_unmap_table(virt, size);
 398 }
 399
 400 int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 401 {
 402         void __iomem *virt;
 403
 404         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 405                 return 0;
 406
 407         if (!addr->address || !addr->bit_width)
 408                 return -EINVAL;
 409
 410         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 411         if (!virt)
 412                 return -EIO;
 413
 414         return 0;
 415 }
 416 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address);
 417
 418 void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 419 {
 420         void __iomem *virt;
 421         unsigned long flags;
 422         acpi_size size = addr->bit_width / 8;
 423
 424         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 425                 return;
 426
 427         if (!addr->address || !addr->bit_width)
 428                 return;
 429
 430         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 431         virt = acpi_map_vaddr_lookup(addr->address, size);
 432         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 433
 434         acpi_os_unmap_memory(virt, size);
 435 }
 436 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address);
 437
 438 #ifdef ACPI_FUTURE_USAGE
 439 acpi_status
 440 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 441 {
 442         if (!phys || !virt)
 443                 return AE_BAD_PARAMETER;
 444
 445         *phys = virt_to_phys(virt);
 446
 447         return AE_OK;
 448 }
 449 #endif
 450
 451 #define ACPI_MAX_OVERRIDE_LEN 100
 452
 453 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 454
 455 acpi_status
 456 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 457                             acpi_string * new_val)
 458 {
 459         if (!init_val || !new_val)
 460                 return AE_BAD_PARAMETER;
 461
 462         *new_val = NULL;
 463         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 464                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 465                        acpi_os_name);
 466                 *new_val = acpi_os_name;
 467         }
 468
 469         return AE_OK;
 470 }
 471
 472 acpi_status
 473 acpi_os_table_override(struct acpi_table_header * existing_table,
 474                        struct acpi_table_header ** new_table)
 475 {
 476         if (!existing_table || !new_table)
 477                 return AE_BAD_PARAMETER;
 478
 479         *new_table = NULL;
 480
 481 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 482         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 483                 *new_table = (struct acpi_table_header *)AmlCode;
 484 #endif
 485         if (*new_table != NULL) {
 486                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 487                            "this is unsafe: tainting kernel\n",
 488                        existing_table->signature,
 489                        existing_table->oem_table_id);
 490                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 491         }
 492         return AE_OK;
 493 }
 494
 495 static irqreturn_t acpi_irq(int irq, void *dev_id)
 496 {
 497         u32 handled;
 498
 499         handled = (*acpi_irq_handler) (acpi_irq_context);
 500
 501         if (handled) {
 502                 acpi_irq_handled++;
 503                 return IRQ_HANDLED;
 504         } else {
 505                 acpi_irq_not_handled++;
 506                 return IRQ_NONE;
 507         }
 508 }
 509
 510 acpi_status
 511 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 512                                   void *context)
 513 {
 514         unsigned int irq;
 515
 516         acpi_irq_stats_init();
 517
 518         /*
 519          * Ignore the GSI from the core, and use the value in our copy of the
 520          * FADT. It may not be the same if an interrupt source override exists
 521          * for the SCI.
 522          */
 523         gsi = acpi_gbl_FADT.sci_interrupt;
 524         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 525                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 526                        gsi);
 527                 return AE_OK;
 528         }
 529
 530         acpi_irq_handler = handler;
 531         acpi_irq_context = context;
 532         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 533                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 534                 return AE_NOT_ACQUIRED;
 535         }
 536         acpi_irq_irq = irq;
 537
 538         return AE_OK;
 539 }
 540
 541 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 542 {
 543         if (irq) {
 544                 free_irq(irq, acpi_irq);
 545                 acpi_irq_handler = NULL;
 546                 acpi_irq_irq = 0;
 547         }
 548
 549         return AE_OK;
 550 }
 551
 552 /*
 553  * Running in interpreter thread context, safe to sleep
 554  */
 555
 556 void acpi_os_sleep(u64 ms)
 557 {
 558         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 559 }
 560
 561 void acpi_os_stall(u32 us)
 562 {
 563         while (us) {
 564                 u32 delay = 1000;
 565
 566                 if (delay > us)
 567                         delay = us;
 568                 udelay(delay);
 569                 touch_nmi_watchdog();
 570                 us -= delay;
 571         }
 572 }
 573
 574 /*
 575  * Support ACPI 3.0 AML Timer operand
 576  * Returns 64-bit free-running, monotonically increasing timer
 577  * with 100ns granularity
 578  */
 579 u64 acpi_os_get_timer(void)
 580 {
 581         static u64 t;
 582
 583 #ifdef  CONFIG_HPET
 584         /* TBD: use HPET if available */
 585 #endif
 586
 587 #ifdef  CONFIG_X86_PM_TIMER
 588         /* TBD: default to PM timer if HPET was not available */
 589 #endif
 590         if (!t)
 591                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 592
 593         return ++t;
 594 }
 595
 596 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 597 {
 598         u32 dummy;
 599
 600         if (!value)
 601                 value = &dummy;
 602
 603         *value = 0;
 604         if (width <= 8) {
 605                 *(u8 *) value = inb(port);
 606         } else if (width <= 16) {
 607                 *(u16 *) value = inw(port);
 608         } else if (width <= 32) {
 609                 *(u32 *) value = inl(port);
 610         } else {
 611                 BUG();
 612         }
 613
 614         return AE_OK;
 615 }
 616
 617 EXPORT_SYMBOL(acpi_os_read_port);
 618
 619 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 620 {
 621         if (width <= 8) {
 622                 outb(value, port);
 623         } else if (width <= 16) {
 624                 outw(value, port);
 625         } else if (width <= 32) {
 626                 outl(value, port);
 627         } else {
 628                 BUG();
 629         }
 630
 631         return AE_OK;
 632 }
 633
 634 EXPORT_SYMBOL(acpi_os_write_port);
 635
 636 acpi_status
 637 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 638 {
 639         u32 dummy;
 640         void __iomem *virt_addr;
 641         int size = width / 8, unmap = 0;
 642
 643         rcu_read_lock();
 644         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 645         rcu_read_unlock();
 646         if (!virt_addr) {
 647                 virt_addr = acpi_os_ioremap(phys_addr, size);
 648                 unmap = 1;
 649         }
 650         if (!value)
 651                 value = &dummy;
 652
 653         switch (width) {
 654         case 8:
 655                 *(u8 *) value = readb(virt_addr);
 656                 break;
 657         case 16:
 658                 *(u16 *) value = readw(virt_addr);
 659                 break;
 660         case 32:
 661                 *(u32 *) value = readl(virt_addr);
 662                 break;
 663         default:
 664                 BUG();
 665         }
 666
 667         if (unmap)
 668                 iounmap(virt_addr);
 669
 670         return AE_OK;
 671 }
 672
 673 acpi_status
 674 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 675 {
 676         void __iomem *virt_addr;
 677         int size = width / 8, unmap = 0;
 678
 679         rcu_read_lock();
 680         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 681         rcu_read_unlock();
 682         if (!virt_addr) {
 683                 virt_addr = acpi_os_ioremap(phys_addr, size);
 684                 unmap = 1;
 685         }
 686
 687         switch (width) {
 688         case 8:
 689                 writeb(value, virt_addr);
 690                 break;
 691         case 16:
 692                 writew(value, virt_addr);
 693                 break;
 694         case 32:
 695                 writel(value, virt_addr);
 696                 break;
 697         default:
 698                 BUG();
 699         }
 700
 701         if (unmap)
 702                 iounmap(virt_addr);
 703
 704         return AE_OK;
 705 }
 706
 707 acpi_status
 708 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 709                                u64 *value, u32 width)
 710 {
 711         int result, size;
 712         u32 value32;
 713
 714         if (!value)
 715                 return AE_BAD_PARAMETER;
 716
 717         switch (width) {
 718         case 8:
 719                 size = 1;
 720                 break;
 721         case 16:
 722                 size = 2;
 723                 break;
 724         case 32:
 725                 size = 4;
 726                 break;
 727         default:
 728                 return AE_ERROR;
 729         }
 730
 731         result = raw_pci_read(pci_id->segment, pci_id->bus,
 732                                 PCI_DEVFN(pci_id->device, pci_id->function),
 733                                 reg, size, &value32);
 734         *value = value32;
 735
 736         return (result ? AE_ERROR : AE_OK);
 737 }
 738
 739 acpi_status
 740 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 741                                 u64 value, u32 width)
 742 {
 743         int result, size;
 744
 745         switch (width) {
 746         case 8:
 747                 size = 1;
 748                 break;
 749         case 16:
 750                 size = 2;
 751                 break;
 752         case 32:
 753                 size = 4;
 754                 break;
 755         default:
 756                 return AE_ERROR;
 757         }
 758
 759         result = raw_pci_write(pci_id->segment, pci_id->bus,
 760                                 PCI_DEVFN(pci_id->device, pci_id->function),
 761                                 reg, size, value);
 762
 763         return (result ? AE_ERROR : AE_OK);
 764 }
 765
 766 static void acpi_os_execute_deferred(struct work_struct *work)
 767 {
 768         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 769
 770         if (dpc->wait)
 771                 acpi_os_wait_events_complete(NULL);
 772
 773         dpc->function(dpc->context);
 774         kfree(dpc);
 775 }
 776
 777 /*******************************************************************************
 778  *
 779  * FUNCTION:    acpi_os_execute
 780  *
 781  * PARAMETERS:  Type               - Type of the callback
 782  *              Function           - Function to be executed
 783  *              Context            - Function parameters
 784  *
 785  * RETURN:      Status
 786  *
 787  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 788  *              immediately executes function on a separate thread.
 789  *
 790  ******************************************************************************/
 791
 792 static acpi_status __acpi_os_execute(acpi_execute_type type,
 793         acpi_osd_exec_callback function, void *context, int hp)
 794 {
 795         acpi_status status = AE_OK;
 796         struct acpi_os_dpc *dpc;
 797         struct workqueue_struct *queue;
 798         int ret;
 799         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 800                           "Scheduling function [%p(%p)] for deferred execution.\n",
 801                           function, context));
 802
 803         /*
 804          * Allocate/initialize DPC structure.  Note that this memory will be
 805          * freed by the callee.  The kernel handles the work_struct list  in a
 806          * way that allows us to also free its memory inside the callee.
 807          * Because we may want to schedule several tasks with different
 808          * parameters we can't use the approach some kernel code uses of
 809          * having a static work_struct.
 810          */
 811
 812         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 813         if (!dpc)
 814                 return AE_NO_MEMORY;
 815
 816         dpc->function = function;
 817         dpc->context = context;
 818
 819         /*
 820          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 821          * because the hotplug code may call driver .remove() functions,
 822          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 823          * to flush these workqueues.
 824          */
 825         queue = hp ? kacpi_hotplug_wq :
 826                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 827         dpc->wait = hp ? 1 : 0;
 828
 829         if (queue == kacpi_hotplug_wq)
 830                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 831         else if (queue == kacpi_notify_wq)
 832                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 833         else
 834                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 835
 836         /*
 837          * On some machines, a software-initiated SMI causes corruption unless
 838          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 839          * typically it's done in GPE-related methods that are run via
 840          * workqueues, so we can avoid the known corruption cases by always
 841          * queueing on CPU 0.
 842          */
 843         ret = queue_work_on(0, queue, &dpc->work);
 844
 845         if (!ret) {
 846                 printk(KERN_ERR PREFIX
 847                           "Call to queue_work() failed.\n");
 848                 status = AE_ERROR;
 849                 kfree(dpc);
 850         }
 851         return status;
 852 }
 853
 854 acpi_status acpi_os_execute(acpi_execute_type type,
 855                             acpi_osd_exec_callback function, void *context)
 856 {
 857         return __acpi_os_execute(type, function, context, 0);
 858 }
 859 EXPORT_SYMBOL(acpi_os_execute);
 860
 861 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 862         void *context)
 863 {
 864         return __acpi_os_execute(0, function, context, 1);
 865 }
 866
 867 void acpi_os_wait_events_complete(void *context)
 868 {
 869         flush_workqueue(kacpid_wq);
 870         flush_workqueue(kacpi_notify_wq);
 871 }
 872
 873 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 874
 875 /*
 876  * Deallocate the memory for a spinlock.
 877  */
 878 void acpi_os_delete_lock(acpi_spinlock handle)
 879 {
 880         return;
 881 }
 882
 883 acpi_status
 884 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 885 {
 886         struct semaphore *sem = NULL;
 887
 888         sem = acpi_os_allocate(sizeof(struct semaphore));
 889         if (!sem)
 890                 return AE_NO_MEMORY;
 891         memset(sem, 0, sizeof(struct semaphore));
 892
 893         sema_init(sem, initial_units);
 894
 895         *handle = (acpi_handle *) sem;
 896
 897         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 898                           *handle, initial_units));
 899
 900         return AE_OK;
 901 }
 902
 903 /*
 904  * TODO: A better way to delete semaphores?  Linux doesn't have a
 905  * 'delete_semaphore()' function -- may result in an invalid
 906  * pointer dereference for non-synchronized consumers.  Should
 907  * we at least check for blocked threads and signal/cancel them?
 908  */
 909
 910 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 911 {
 912         struct semaphore *sem = (struct semaphore *)handle;
 913
 914         if (!sem)
 915                 return AE_BAD_PARAMETER;
 916
 917         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 918
 919         BUG_ON(!list_empty(&sem->wait_list));
 920         kfree(sem);
 921         sem = NULL;
 922
 923         return AE_OK;
 924 }
 925
 926 /*
 927  * TODO: Support for units > 1?
 928  */
 929 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 930 {
 931         acpi_status status = AE_OK;
 932         struct semaphore *sem = (struct semaphore *)handle;
 933         long jiffies;
 934         int ret = 0;
 935
 936         if (!sem || (units < 1))
 937                 return AE_BAD_PARAMETER;
 938
 939         if (units > 1)
 940                 return AE_SUPPORT;
 941
 942         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 943                           handle, units, timeout));
 944
 945         if (timeout == ACPI_WAIT_FOREVER)
 946                 jiffies = MAX_SCHEDULE_TIMEOUT;
 947         else
 948                 jiffies = msecs_to_jiffies(timeout);
 949
 950         ret = down_timeout(sem, jiffies);
 951         if (ret)
 952                 status = AE_TIME;
 953
 954         if (ACPI_FAILURE(status)) {
 955                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 956                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 957                                   handle, units, timeout,
 958                                   acpi_format_exception(status)));
 959         } else {
 960                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 961                                   "Acquired semaphore[%p|%d|%d]", handle,
 962                                   units, timeout));
 963         }
 964
 965         return status;
 966 }
 967
 968 /*
 969  * TODO: Support for units > 1?
 970  */
 971 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 972 {
 973         struct semaphore *sem = (struct semaphore *)handle;
 974
 975         if (!sem || (units < 1))
 976                 return AE_BAD_PARAMETER;
 977
 978         if (units > 1)
 979                 return AE_SUPPORT;
 980
 981         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 982                           units));
 983
 984         up(sem);
 985
 986         return AE_OK;
 987 }
 988
 989 #ifdef ACPI_FUTURE_USAGE
 990 u32 acpi_os_get_line(char *buffer)
 991 {
 992
 993 #ifdef ENABLE_DEBUGGER
 994         if (acpi_in_debugger) {
 995                 u32 chars;
 996
 997                 kdb_read(buffer, sizeof(line_buf));
 998
 999                 /* remove the CR kdb includes */
1000                 chars = strlen(buffer) - 1;
1001                 buffer[chars] = '\0';
1002         }
1003 #endif
1004
1005         return 0;
1006 }
1007 #endif                          /*  ACPI_FUTURE_USAGE  */
1008
1009 acpi_status acpi_os_signal(u32 function, void *info)
1010 {
1011         switch (function) {
1012         case ACPI_SIGNAL_FATAL:
1013                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1014                 break;
1015         case ACPI_SIGNAL_BREAKPOINT:
1016                 /*
1017                  * AML Breakpoint
1018                  * ACPI spec. says to treat it as a NOP unless
1019                  * you are debugging.  So if/when we integrate
1020                  * AML debugger into the kernel debugger its
1021                  * hook will go here.  But until then it is
1022                  * not useful to print anything on breakpoints.
1023                  */
1024                 break;
1025         default:
1026                 break;
1027         }
1028
1029         return AE_OK;
1030 }
1031
1032 static int __init acpi_os_name_setup(char *str)
1033 {
1034         char *p = acpi_os_name;
1035         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1036
1037         if (!str || !*str)
1038                 return 0;
1039
1040         for (; count-- && str && *str; str++) {
1041                 if (isalnum(*str) || *str == ' ' || *str == ':')
1042                         *p++ = *str;
1043                 else if (*str == '\'' || *str == '"')
1044                         continue;
1045                 else
1046                         break;
1047         }
1048         *p = 0;
1049
1050         return 1;
1051
1052 }
1053
1054 __setup("acpi_os_name=", acpi_os_name_setup);
1055
1056 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1057 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1058
1059 struct osi_setup_entry {
1060         char string[OSI_STRING_LENGTH_MAX];
1061         bool enable;
1062 };
1063
1064 static struct osi_setup_entry __initdata osi_setup_entries[OSI_STRING_ENTRIES_MAX];
1065
1066 void __init acpi_osi_setup(char *str)
1067 {
1068         struct osi_setup_entry *osi;
1069         bool enable = true;
1070         int i;
1071
1072         if (!acpi_gbl_create_osi_method)
1073                 return;
1074
1075         if (str == NULL || *str == '\0') {
1076                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1077                 acpi_gbl_create_osi_method = FALSE;
1078                 return;
1079         }
1080
1081         if (*str == '!') {
1082                 str++;
1083                 enable = false;
1084         }
1085
1086         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1087                 osi = &osi_setup_entries[i];
1088                 if (!strcmp(osi->string, str)) {
1089                         osi->enable = enable;
1090                         break;
1091                 } else if (osi->string[0] == '\0') {
1092                         osi->enable = enable;
1093                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1094                         break;
1095                 }
1096         }
1097 }
1098
1099 static void __init set_osi_linux(unsigned int enable)
1100 {
1101         if (osi_linux.enable != enable)
1102                 osi_linux.enable = enable;
1103
1104         if (osi_linux.enable)
1105                 acpi_osi_setup("Linux");
1106         else
1107                 acpi_osi_setup("!Linux");
1108
1109         return;
1110 }
1111
1112 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1113 {
1114         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1115         osi_linux.dmi = 0;
1116         set_osi_linux(enable);
1117
1118         return;
1119 }
1120
1121 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1122 {
1123         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1124
1125         if (enable == -1)
1126                 return;
1127
1128         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1129         set_osi_linux(enable);
1130
1131         return;
1132 }
1133
1134 /*
1135  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1136  *
1137  * empty string disables _OSI
1138  * string starting with '!' disables that string
1139  * otherwise string is added to list, augmenting built-in strings
1140  */
1141 static void __init acpi_osi_setup_late(void)
1142 {
1143         struct osi_setup_entry *osi;
1144         char *str;
1145         int i;
1146         acpi_status status;
1147
1148         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1149                 osi = &osi_setup_entries[i];
1150                 str = osi->string;
1151
1152                 if (*str == '\0')
1153                         break;
1154                 if (osi->enable) {
1155                         status = acpi_install_interface(str);
1156
1157                         if (ACPI_SUCCESS(status))
1158                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1159                 } else {
1160                         status = acpi_remove_interface(str);
1161
1162                         if (ACPI_SUCCESS(status))
1163                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1164                 }
1165         }
1166 }
1167
1168 static int __init osi_setup(char *str)
1169 {
1170         if (str && !strcmp("Linux", str))
1171                 acpi_cmdline_osi_linux(1);
1172         else if (str && !strcmp("!Linux", str))
1173                 acpi_cmdline_osi_linux(0);
1174         else
1175                 acpi_osi_setup(str);
1176
1177         return 1;
1178 }
1179
1180 __setup("acpi_osi=", osi_setup);
1181
1182 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1183 static int __init acpi_serialize_setup(char *str)
1184 {
1185         printk(KERN_INFO PREFIX "serialize enabled\n");
1186
1187         acpi_gbl_all_methods_serialized = TRUE;
1188
1189         return 1;
1190 }
1191
1192 __setup("acpi_serialize", acpi_serialize_setup);
1193
1194 /* Check of resource interference between native drivers and ACPI
1195  * OperationRegions (SystemIO and System Memory only).
1196  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1197  * in arbitrary AML code and can interfere with legacy drivers.
1198  * acpi_enforce_resources= can be set to:
1199  *
1200  *   - strict (default) (2)
1201  *     -> further driver trying to access the resources will not load
1202  *   - lax              (1)
1203  *     -> further driver trying to access the resources will load, but you
1204  *     get a system message that something might go wrong...
1205  *
1206  *   - no               (0)
1207  *     -> ACPI Operation Region resources will not be registered
1208  *
1209  */
1210 #define ENFORCE_RESOURCES_STRICT 2
1211 #define ENFORCE_RESOURCES_LAX    1
1212 #define ENFORCE_RESOURCES_NO     0
1213
1214 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1215
1216 static int __init acpi_enforce_resources_setup(char *str)
1217 {
1218         if (str == NULL || *str == '\0')
1219                 return 0;
1220
1221         if (!strcmp("strict", str))
1222                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1223         else if (!strcmp("lax", str))
1224                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1225         else if (!strcmp("no", str))
1226                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1227
1228         return 1;
1229 }
1230
1231 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1232
1233 /* Check for resource conflicts between ACPI OperationRegions and native
1234  * drivers */
1235 int acpi_check_resource_conflict(const struct resource *res)
1236 {
1237         struct acpi_res_list *res_list_elem;
1238         int ioport = 0, clash = 0;
1239
1240         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1241                 return 0;
1242         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1243                 return 0;
1244
1245         ioport = res->flags & IORESOURCE_IO;
1246
1247         spin_lock(&acpi_res_lock);
1248         list_for_each_entry(res_list_elem, &resource_list_head,
1249                             resource_list) {
1250                 if (ioport && (res_list_elem->resource_type
1251                                != ACPI_ADR_SPACE_SYSTEM_IO))
1252                         continue;
1253                 if (!ioport && (res_list_elem->resource_type
1254                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1255                         continue;
1256
1257                 if (res->end < res_list_elem->start
1258                     || res_list_elem->end < res->start)
1259                         continue;
1260                 clash = 1;
1261                 break;
1262         }
1263         spin_unlock(&acpi_res_lock);
1264
1265         if (clash) {
1266                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1267                         printk(KERN_WARNING "ACPI: resource %s %pR"
1268                                " conflicts with ACPI region %s "
1269                                "[%s 0x%zx-0x%zx]\n",
1270                                res->name, res, res_list_elem->name,
1271                                (res_list_elem->resource_type ==
1272                                 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1273                                (size_t) res_list_elem->start,
1274                                (size_t) res_list_elem->end);
1275                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1276                                 printk(KERN_NOTICE "ACPI: This conflict may"
1277                                        " cause random problems and system"
1278                                        " instability\n");
1279                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1280                                " for this device, you should use it instead of"
1281                                " the native driver\n");
1282                 }
1283                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1284                         return -EBUSY;
1285         }
1286         return 0;
1287 }
1288 EXPORT_SYMBOL(acpi_check_resource_conflict);
1289
1290 int acpi_check_region(resource_size_t start, resource_size_t n,
1291                       const char *name)
1292 {
1293         struct resource res = {
1294                 .start = start,
1295                 .end   = start + n - 1,
1296                 .name  = name,
1297                 .flags = IORESOURCE_IO,
1298         };
1299
1300         return acpi_check_resource_conflict(&res);
1301 }
1302 EXPORT_SYMBOL(acpi_check_region);
1303
1304 /*
1305  * Let drivers know whether the resource checks are effective
1306  */
1307 int acpi_resources_are_enforced(void)
1308 {
1309         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1310 }
1311 EXPORT_SYMBOL(acpi_resources_are_enforced);
1312
1313 /*
1314  * Acquire a spinlock.
1315  *
1316  * handle is a pointer to the spinlock_t.
1317  */
1318
1319 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1320 {
1321         acpi_cpu_flags flags;
1322         spin_lock_irqsave(lockp, flags);
1323         return flags;
1324 }
1325
1326 /*
1327  * Release a spinlock. See above.
1328  */
1329
1330 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1331 {
1332         spin_unlock_irqrestore(lockp, flags);
1333 }
1334
1335 #ifndef ACPI_USE_LOCAL_CACHE
1336
1337 /*******************************************************************************
1338  *
1339  * FUNCTION:    acpi_os_create_cache
1340  *
1341  * PARAMETERS:  name      - Ascii name for the cache
1342  *              size      - Size of each cached object
1343  *              depth     - Maximum depth of the cache (in objects) <ignored>
1344  *              cache     - Where the new cache object is returned
1345  *
1346  * RETURN:      status
1347  *
1348  * DESCRIPTION: Create a cache object
1349  *
1350  ******************************************************************************/
1351
1352 acpi_status
1353 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1354 {
1355         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1356         if (*cache == NULL)
1357                 return AE_ERROR;
1358         else
1359                 return AE_OK;
1360 }
1361
1362 /*******************************************************************************
1363  *
1364  * FUNCTION:    acpi_os_purge_cache
1365  *
1366  * PARAMETERS:  Cache           - Handle to cache object
1367  *
1368  * RETURN:      Status
1369  *
1370  * DESCRIPTION: Free all objects within the requested cache.
1371  *
1372  ******************************************************************************/
1373
1374 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1375 {
1376         kmem_cache_shrink(cache);
1377         return (AE_OK);
1378 }
1379
1380 /*******************************************************************************
1381  *
1382  * FUNCTION:    acpi_os_delete_cache
1383  *
1384  * PARAMETERS:  Cache           - Handle to cache object
1385  *
1386  * RETURN:      Status
1387  *
1388  * DESCRIPTION: Free all objects within the requested cache and delete the
1389  *              cache object.
1390  *
1391  ******************************************************************************/
1392
1393 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1394 {
1395         kmem_cache_destroy(cache);
1396         return (AE_OK);
1397 }
1398
1399 /*******************************************************************************
1400  *
1401  * FUNCTION:    acpi_os_release_object
1402  *
1403  * PARAMETERS:  Cache       - Handle to cache object
1404  *              Object      - The object to be released
1405  *
1406  * RETURN:      None
1407  *
1408  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1409  *              the object is deleted.
1410  *
1411  ******************************************************************************/
1412
1413 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1414 {
1415         kmem_cache_free(cache, object);
1416         return (AE_OK);
1417 }
1418
1419 static inline int acpi_res_list_add(struct acpi_res_list *res)
1420 {
1421         struct acpi_res_list *res_list_elem;
1422
1423         list_for_each_entry(res_list_elem, &resource_list_head,
1424                             resource_list) {
1425
1426                 if (res->resource_type == res_list_elem->resource_type &&
1427                     res->start == res_list_elem->start &&
1428                     res->end == res_list_elem->end) {
1429
1430                         /*
1431                          * The Region(addr,len) already exist in the list,
1432                          * just increase the count
1433                          */
1434
1435                         res_list_elem->count++;
1436                         return 0;
1437                 }
1438         }
1439
1440         res->count = 1;
1441         list_add(&res->resource_list, &resource_list_head);
1442         return 1;
1443 }
1444
1445 static inline void acpi_res_list_del(struct acpi_res_list *res)
1446 {
1447         struct acpi_res_list *res_list_elem;
1448
1449         list_for_each_entry(res_list_elem, &resource_list_head,
1450                             resource_list) {
1451
1452                 if (res->resource_type == res_list_elem->resource_type &&
1453                     res->start == res_list_elem->start &&
1454                     res->end == res_list_elem->end) {
1455
1456                         /*
1457                          * If the res count is decreased to 0,
1458                          * remove and free it
1459                          */
1460
1461                         if (--res_list_elem->count == 0) {
1462                                 list_del(&res_list_elem->resource_list);
1463                                 kfree(res_list_elem);
1464                         }
1465                         return;
1466                 }
1467         }
1468 }
1469
1470 acpi_status
1471 acpi_os_invalidate_address(
1472     u8                   space_id,
1473     acpi_physical_address   address,
1474     acpi_size               length)
1475 {
1476         struct acpi_res_list res;
1477
1478         switch (space_id) {
1479         case ACPI_ADR_SPACE_SYSTEM_IO:
1480         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1481                 /* Only interference checks against SystemIO and SystemMemory
1482                    are needed */
1483                 res.start = address;
1484                 res.end = address + length - 1;
1485                 res.resource_type = space_id;
1486                 spin_lock(&acpi_res_lock);
1487                 acpi_res_list_del(&res);
1488                 spin_unlock(&acpi_res_lock);
1489                 break;
1490         case ACPI_ADR_SPACE_PCI_CONFIG:
1491         case ACPI_ADR_SPACE_EC:
1492         case ACPI_ADR_SPACE_SMBUS:
1493         case ACPI_ADR_SPACE_CMOS:
1494         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1495         case ACPI_ADR_SPACE_DATA_TABLE:
1496         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1497                 break;
1498         }
1499         return AE_OK;
1500 }
1501
1502 /******************************************************************************
1503  *
1504  * FUNCTION:    acpi_os_validate_address
1505  *
1506  * PARAMETERS:  space_id             - ACPI space ID
1507  *              address             - Physical address
1508  *              length              - Address length
1509  *
1510  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1511  *              should return AE_AML_ILLEGAL_ADDRESS.
1512  *
1513  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1514  *              the addresses accessed by AML operation regions.
1515  *
1516  *****************************************************************************/
1517
1518 acpi_status
1519 acpi_os_validate_address (
1520     u8                   space_id,
1521     acpi_physical_address   address,
1522     acpi_size               length,
1523     char *name)
1524 {
1525         struct acpi_res_list *res;
1526         int added;
1527         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1528                 return AE_OK;
1529
1530         switch (space_id) {
1531         case ACPI_ADR_SPACE_SYSTEM_IO:
1532         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1533                 /* Only interference checks against SystemIO and SystemMemory
1534                    are needed */
1535                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1536                 if (!res)
1537                         return AE_OK;
1538                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1539                 strlcpy(res->name, name, 5);
1540                 res->start = address;
1541                 res->end = address + length - 1;
1542                 res->resource_type = space_id;
1543                 spin_lock(&acpi_res_lock);
1544                 added = acpi_res_list_add(res);
1545                 spin_unlock(&acpi_res_lock);
1546                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1547                          "name: %s\n", added ? "Added" : "Already exist",
1548                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1549                          ? "SystemIO" : "System Memory",
1550                          (unsigned long long)res->start,
1551                          (unsigned long long)res->end,
1552                          res->name);
1553                 if (!added)
1554                         kfree(res);
1555                 break;
1556         case ACPI_ADR_SPACE_PCI_CONFIG:
1557         case ACPI_ADR_SPACE_EC:
1558         case ACPI_ADR_SPACE_SMBUS:
1559         case ACPI_ADR_SPACE_CMOS:
1560         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1561         case ACPI_ADR_SPACE_DATA_TABLE:
1562         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1563                 break;
1564         }
1565         return AE_OK;
1566 }
1567 #endif
1568
1569 acpi_status __init acpi_os_initialize(void)
1570 {
1571         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1572         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1573         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1574         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1575
1576         return AE_OK;
1577 }
1578
1579 acpi_status __init acpi_os_initialize1(void)
1580 {
1581         kacpid_wq = create_workqueue("kacpid");
1582         kacpi_notify_wq = create_workqueue("kacpi_notify");
1583         kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
1584         BUG_ON(!kacpid_wq);
1585         BUG_ON(!kacpi_notify_wq);
1586         BUG_ON(!kacpi_hotplug_wq);
1587         acpi_install_interface_handler(acpi_osi_handler);
1588         acpi_osi_setup_late();
1589         return AE_OK;
1590 }
1591
1592 acpi_status acpi_os_terminate(void)
1593 {
1594         if (acpi_irq_handler) {
1595                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
1596                                                  acpi_irq_handler);
1597         }
1598
1599         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1600         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1601         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1602         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1603
1604         destroy_workqueue(kacpid_wq);
1605         destroy_workqueue(kacpi_notify_wq);
1606         destroy_workqueue(kacpi_hotplug_wq);
1607
1608         return AE_OK;
1609 }