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_once(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 #ifdef CONFIG_KEXEC
 241 static unsigned long acpi_rsdp;
 242 static int __init setup_acpi_rsdp(char *arg)
 243 {
 244         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 245         return 0;
 246 }
 247 early_param("acpi_rsdp", setup_acpi_rsdp);
 248 #endif
 249
 250 acpi_physical_address __init acpi_os_get_root_pointer(void)
 251 {
 252 #ifdef CONFIG_KEXEC
 253         if (acpi_rsdp)
 254                 return acpi_rsdp;
 255 #endif
 256
 257         if (efi_enabled) {
 258                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 259                         return efi.acpi20;
 260                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 261                         return efi.acpi;
 262                 else {
 263                         printk(KERN_ERR PREFIX
 264                                "System description tables not found\n");
 265                         return 0;
 266                 }
 267         } else {
 268                 acpi_physical_address pa = 0;
 269
 270                 acpi_find_root_pointer(&pa);
 271                 return pa;
 272         }
 273 }
 274
 275 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 276 static struct acpi_ioremap *
 277 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 278 {
 279         struct acpi_ioremap *map;
 280
 281         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 282                 if (map->phys <= phys &&
 283                     phys + size <= map->phys + map->size)
 284                         return map;
 285
 286         return NULL;
 287 }
 288
 289 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 290 static void __iomem *
 291 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 292 {
 293         struct acpi_ioremap *map;
 294
 295         map = acpi_map_lookup(phys, size);
 296         if (map)
 297                 return map->virt + (phys - map->phys);
 298
 299         return NULL;
 300 }
 301
 302 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 303 {
 304         struct acpi_ioremap *map;
 305         void __iomem *virt = NULL;
 306
 307         mutex_lock(&acpi_ioremap_lock);
 308         map = acpi_map_lookup(phys, size);
 309         if (map) {
 310                 virt = map->virt + (phys - map->phys);
 311                 map->refcount++;
 312         }
 313         mutex_unlock(&acpi_ioremap_lock);
 314         return virt;
 315 }
 316 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 317
 318 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 319 static struct acpi_ioremap *
 320 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 321 {
 322         struct acpi_ioremap *map;
 323
 324         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 325                 if (map->virt <= virt &&
 326                     virt + size <= map->virt + map->size)
 327                         return map;
 328
 329         return NULL;
 330 }
 331
 332 void __iomem *__init_refok
 333 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 334 {
 335         struct acpi_ioremap *map;
 336         void __iomem *virt;
 337         acpi_physical_address pg_off;
 338         acpi_size pg_sz;
 339
 340         if (phys > ULONG_MAX) {
 341                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 342                 return NULL;
 343         }
 344
 345         if (!acpi_gbl_permanent_mmap)
 346                 return __acpi_map_table((unsigned long)phys, size);
 347
 348         mutex_lock(&acpi_ioremap_lock);
 349         /* Check if there's a suitable mapping already. */
 350         map = acpi_map_lookup(phys, size);
 351         if (map) {
 352                 map->refcount++;
 353                 goto out;
 354         }
 355
 356         map = kzalloc(sizeof(*map), GFP_KERNEL);
 357         if (!map) {
 358                 mutex_unlock(&acpi_ioremap_lock);
 359                 return NULL;
 360         }
 361
 362         pg_off = round_down(phys, PAGE_SIZE);
 363         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 364         virt = acpi_os_ioremap(pg_off, pg_sz);
 365         if (!virt) {
 366                 mutex_unlock(&acpi_ioremap_lock);
 367                 kfree(map);
 368                 return NULL;
 369         }
 370
 371         INIT_LIST_HEAD(&map->list);
 372         map->virt = virt;
 373         map->phys = pg_off;
 374         map->size = pg_sz;
 375         map->refcount = 1;
 376
 377         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 378
 379  out:
 380         mutex_unlock(&acpi_ioremap_lock);
 381         return map->virt + (phys - map->phys);
 382 }
 383 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 384
 385 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 386 {
 387         if (!--map->refcount)
 388                 list_del_rcu(&map->list);
 389 }
 390
 391 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 392 {
 393         if (!map->refcount) {
 394                 synchronize_rcu();
 395                 iounmap(map->virt);
 396                 kfree(map);
 397         }
 398 }
 399
 400 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 401 {
 402         struct acpi_ioremap *map;
 403
 404         if (!acpi_gbl_permanent_mmap) {
 405                 __acpi_unmap_table(virt, size);
 406                 return;
 407         }
 408
 409         mutex_lock(&acpi_ioremap_lock);
 410         map = acpi_map_lookup_virt(virt, size);
 411         if (!map) {
 412                 mutex_unlock(&acpi_ioremap_lock);
 413                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 414                 return;
 415         }
 416         acpi_os_drop_map_ref(map);
 417         mutex_unlock(&acpi_ioremap_lock);
 418
 419         acpi_os_map_cleanup(map);
 420 }
 421 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 422
 423 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 424 {
 425         if (!acpi_gbl_permanent_mmap)
 426                 __acpi_unmap_table(virt, size);
 427 }
 428
 429 static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 430 {
 431         void __iomem *virt;
 432
 433         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 434                 return 0;
 435
 436         if (!addr->address || !addr->bit_width)
 437                 return -EINVAL;
 438
 439         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 440         if (!virt)
 441                 return -EIO;
 442
 443         return 0;
 444 }
 445
 446 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 447 {
 448         struct acpi_ioremap *map;
 449
 450         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 451                 return;
 452
 453         if (!addr->address || !addr->bit_width)
 454                 return;
 455
 456         mutex_lock(&acpi_ioremap_lock);
 457         map = acpi_map_lookup(addr->address, addr->bit_width / 8);
 458         if (!map) {
 459                 mutex_unlock(&acpi_ioremap_lock);
 460                 return;
 461         }
 462         acpi_os_drop_map_ref(map);
 463         mutex_unlock(&acpi_ioremap_lock);
 464
 465         acpi_os_map_cleanup(map);
 466 }
 467
 468 #ifdef ACPI_FUTURE_USAGE
 469 acpi_status
 470 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 471 {
 472         if (!phys || !virt)
 473                 return AE_BAD_PARAMETER;
 474
 475         *phys = virt_to_phys(virt);
 476
 477         return AE_OK;
 478 }
 479 #endif
 480
 481 #define ACPI_MAX_OVERRIDE_LEN 100
 482
 483 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 484
 485 acpi_status
 486 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 487                             acpi_string * new_val)
 488 {
 489         if (!init_val || !new_val)
 490                 return AE_BAD_PARAMETER;
 491
 492         *new_val = NULL;
 493         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 494                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 495                        acpi_os_name);
 496                 *new_val = acpi_os_name;
 497         }
 498
 499         return AE_OK;
 500 }
 501
 502 acpi_status
 503 acpi_os_table_override(struct acpi_table_header * existing_table,
 504                        struct acpi_table_header ** new_table)
 505 {
 506         if (!existing_table || !new_table)
 507                 return AE_BAD_PARAMETER;
 508
 509         *new_table = NULL;
 510
 511 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 512         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 513                 *new_table = (struct acpi_table_header *)AmlCode;
 514 #endif
 515         if (*new_table != NULL) {
 516                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 517                            "this is unsafe: tainting kernel\n",
 518                        existing_table->signature,
 519                        existing_table->oem_table_id);
 520                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 521         }
 522         return AE_OK;
 523 }
 524
 525 static irqreturn_t acpi_irq(int irq, void *dev_id)
 526 {
 527         u32 handled;
 528
 529         handled = (*acpi_irq_handler) (acpi_irq_context);
 530
 531         if (handled) {
 532                 acpi_irq_handled++;
 533                 return IRQ_HANDLED;
 534         } else {
 535                 acpi_irq_not_handled++;
 536                 return IRQ_NONE;
 537         }
 538 }
 539
 540 acpi_status
 541 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 542                                   void *context)
 543 {
 544         unsigned int irq;
 545
 546         acpi_irq_stats_init();
 547
 548         /*
 549          * ACPI interrupts different from the SCI in our copy of the FADT are
 550          * not supported.
 551          */
 552         if (gsi != acpi_gbl_FADT.sci_interrupt)
 553                 return AE_BAD_PARAMETER;
 554
 555         if (acpi_irq_handler)
 556                 return AE_ALREADY_ACQUIRED;
 557
 558         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 559                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 560                        gsi);
 561                 return AE_OK;
 562         }
 563
 564         acpi_irq_handler = handler;
 565         acpi_irq_context = context;
 566         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 567                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 568                 acpi_irq_handler = NULL;
 569                 return AE_NOT_ACQUIRED;
 570         }
 571
 572         return AE_OK;
 573 }
 574
 575 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 576 {
 577         if (irq != acpi_gbl_FADT.sci_interrupt)
 578                 return AE_BAD_PARAMETER;
 579
 580         free_irq(irq, acpi_irq);
 581         acpi_irq_handler = NULL;
 582
 583         return AE_OK;
 584 }
 585
 586 /*
 587  * Running in interpreter thread context, safe to sleep
 588  */
 589
 590 void acpi_os_sleep(u64 ms)
 591 {
 592         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 593 }
 594
 595 void acpi_os_stall(u32 us)
 596 {
 597         while (us) {
 598                 u32 delay = 1000;
 599
 600                 if (delay > us)
 601                         delay = us;
 602                 udelay(delay);
 603                 touch_nmi_watchdog();
 604                 us -= delay;
 605         }
 606 }
 607
 608 /*
 609  * Support ACPI 3.0 AML Timer operand
 610  * Returns 64-bit free-running, monotonically increasing timer
 611  * with 100ns granularity
 612  */
 613 u64 acpi_os_get_timer(void)
 614 {
 615         static u64 t;
 616
 617 #ifdef  CONFIG_HPET
 618         /* TBD: use HPET if available */
 619 #endif
 620
 621 #ifdef  CONFIG_X86_PM_TIMER
 622         /* TBD: default to PM timer if HPET was not available */
 623 #endif
 624         if (!t)
 625                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 626
 627         return ++t;
 628 }
 629
 630 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 631 {
 632         u32 dummy;
 633
 634         if (!value)
 635                 value = &dummy;
 636
 637         *value = 0;
 638         if (width <= 8) {
 639                 *(u8 *) value = inb(port);
 640         } else if (width <= 16) {
 641                 *(u16 *) value = inw(port);
 642         } else if (width <= 32) {
 643                 *(u32 *) value = inl(port);
 644         } else {
 645                 BUG();
 646         }
 647
 648         return AE_OK;
 649 }
 650
 651 EXPORT_SYMBOL(acpi_os_read_port);
 652
 653 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 654 {
 655         if (width <= 8) {
 656                 outb(value, port);
 657         } else if (width <= 16) {
 658                 outw(value, port);
 659         } else if (width <= 32) {
 660                 outl(value, port);
 661         } else {
 662                 BUG();
 663         }
 664
 665         return AE_OK;
 666 }
 667
 668 EXPORT_SYMBOL(acpi_os_write_port);
 669
 670 acpi_status
 671 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 672 {
 673         void __iomem *virt_addr;
 674         unsigned int size = width / 8;
 675         bool unmap = false;
 676         u32 dummy;
 677
 678         rcu_read_lock();
 679         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 680         if (!virt_addr) {
 681                 rcu_read_unlock();
 682                 virt_addr = acpi_os_ioremap(phys_addr, size);
 683                 if (!virt_addr)
 684                         return AE_BAD_ADDRESS;
 685                 unmap = true;
 686         }
 687
 688         if (!value)
 689                 value = &dummy;
 690
 691         switch (width) {
 692         case 8:
 693                 *(u8 *) value = readb(virt_addr);
 694                 break;
 695         case 16:
 696                 *(u16 *) value = readw(virt_addr);
 697                 break;
 698         case 32:
 699                 *(u32 *) value = readl(virt_addr);
 700                 break;
 701         default:
 702                 BUG();
 703         }
 704
 705         if (unmap)
 706                 iounmap(virt_addr);
 707         else
 708                 rcu_read_unlock();
 709
 710         return AE_OK;
 711 }
 712
 713 acpi_status
 714 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 715 {
 716         void __iomem *virt_addr;
 717         unsigned int size = width / 8;
 718         bool unmap = false;
 719
 720         rcu_read_lock();
 721         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 722         if (!virt_addr) {
 723                 rcu_read_unlock();
 724                 virt_addr = acpi_os_ioremap(phys_addr, size);
 725                 if (!virt_addr)
 726                         return AE_BAD_ADDRESS;
 727                 unmap = true;
 728         }
 729
 730         switch (width) {
 731         case 8:
 732                 writeb(value, virt_addr);
 733                 break;
 734         case 16:
 735                 writew(value, virt_addr);
 736                 break;
 737         case 32:
 738                 writel(value, virt_addr);
 739                 break;
 740         default:
 741                 BUG();
 742         }
 743
 744         if (unmap)
 745                 iounmap(virt_addr);
 746         else
 747                 rcu_read_unlock();
 748
 749         return AE_OK;
 750 }
 751
 752 acpi_status
 753 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 754                                u64 *value, u32 width)
 755 {
 756         int result, size;
 757         u32 value32;
 758
 759         if (!value)
 760                 return AE_BAD_PARAMETER;
 761
 762         switch (width) {
 763         case 8:
 764                 size = 1;
 765                 break;
 766         case 16:
 767                 size = 2;
 768                 break;
 769         case 32:
 770                 size = 4;
 771                 break;
 772         default:
 773                 return AE_ERROR;
 774         }
 775
 776         result = raw_pci_read(pci_id->segment, pci_id->bus,
 777                                 PCI_DEVFN(pci_id->device, pci_id->function),
 778                                 reg, size, &value32);
 779         *value = value32;
 780
 781         return (result ? AE_ERROR : AE_OK);
 782 }
 783
 784 acpi_status
 785 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 786                                 u64 value, u32 width)
 787 {
 788         int result, size;
 789
 790         switch (width) {
 791         case 8:
 792                 size = 1;
 793                 break;
 794         case 16:
 795                 size = 2;
 796                 break;
 797         case 32:
 798                 size = 4;
 799                 break;
 800         default:
 801                 return AE_ERROR;
 802         }
 803
 804         result = raw_pci_write(pci_id->segment, pci_id->bus,
 805                                 PCI_DEVFN(pci_id->device, pci_id->function),
 806                                 reg, size, value);
 807
 808         return (result ? AE_ERROR : AE_OK);
 809 }
 810
 811 static void acpi_os_execute_deferred(struct work_struct *work)
 812 {
 813         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 814
 815         if (dpc->wait)
 816                 acpi_os_wait_events_complete(NULL);
 817
 818         dpc->function(dpc->context);
 819         kfree(dpc);
 820 }
 821
 822 /*******************************************************************************
 823  *
 824  * FUNCTION:    acpi_os_execute
 825  *
 826  * PARAMETERS:  Type               - Type of the callback
 827  *              Function           - Function to be executed
 828  *              Context            - Function parameters
 829  *
 830  * RETURN:      Status
 831  *
 832  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 833  *              immediately executes function on a separate thread.
 834  *
 835  ******************************************************************************/
 836
 837 static acpi_status __acpi_os_execute(acpi_execute_type type,
 838         acpi_osd_exec_callback function, void *context, int hp)
 839 {
 840         acpi_status status = AE_OK;
 841         struct acpi_os_dpc *dpc;
 842         struct workqueue_struct *queue;
 843         int ret;
 844         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 845                           "Scheduling function [%p(%p)] for deferred execution.\n",
 846                           function, context));
 847
 848         /*
 849          * Allocate/initialize DPC structure.  Note that this memory will be
 850          * freed by the callee.  The kernel handles the work_struct list  in a
 851          * way that allows us to also free its memory inside the callee.
 852          * Because we may want to schedule several tasks with different
 853          * parameters we can't use the approach some kernel code uses of
 854          * having a static work_struct.
 855          */
 856
 857         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 858         if (!dpc)
 859                 return AE_NO_MEMORY;
 860
 861         dpc->function = function;
 862         dpc->context = context;
 863
 864         /*
 865          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 866          * because the hotplug code may call driver .remove() functions,
 867          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 868          * to flush these workqueues.
 869          */
 870         queue = hp ? kacpi_hotplug_wq :
 871                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 872         dpc->wait = hp ? 1 : 0;
 873
 874         if (queue == kacpi_hotplug_wq)
 875                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 876         else if (queue == kacpi_notify_wq)
 877                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 878         else
 879                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 880
 881         /*
 882          * On some machines, a software-initiated SMI causes corruption unless
 883          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 884          * typically it's done in GPE-related methods that are run via
 885          * workqueues, so we can avoid the known corruption cases by always
 886          * queueing on CPU 0.
 887          */
 888         ret = queue_work_on(0, queue, &dpc->work);
 889
 890         if (!ret) {
 891                 printk(KERN_ERR PREFIX
 892                           "Call to queue_work() failed.\n");
 893                 status = AE_ERROR;
 894                 kfree(dpc);
 895         }
 896         return status;
 897 }
 898
 899 acpi_status acpi_os_execute(acpi_execute_type type,
 900                             acpi_osd_exec_callback function, void *context)
 901 {
 902         return __acpi_os_execute(type, function, context, 0);
 903 }
 904 EXPORT_SYMBOL(acpi_os_execute);
 905
 906 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 907         void *context)
 908 {
 909         return __acpi_os_execute(0, function, context, 1);
 910 }
 911
 912 void acpi_os_wait_events_complete(void *context)
 913 {
 914         flush_workqueue(kacpid_wq);
 915         flush_workqueue(kacpi_notify_wq);
 916 }
 917
 918 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 919
 920 acpi_status
 921 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 922 {
 923         struct semaphore *sem = NULL;
 924
 925         sem = acpi_os_allocate(sizeof(struct semaphore));
 926         if (!sem)
 927                 return AE_NO_MEMORY;
 928         memset(sem, 0, sizeof(struct semaphore));
 929
 930         sema_init(sem, initial_units);
 931
 932         *handle = (acpi_handle *) sem;
 933
 934         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 935                           *handle, initial_units));
 936
 937         return AE_OK;
 938 }
 939
 940 /*
 941  * TODO: A better way to delete semaphores?  Linux doesn't have a
 942  * 'delete_semaphore()' function -- may result in an invalid
 943  * pointer dereference for non-synchronized consumers.  Should
 944  * we at least check for blocked threads and signal/cancel them?
 945  */
 946
 947 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 948 {
 949         struct semaphore *sem = (struct semaphore *)handle;
 950
 951         if (!sem)
 952                 return AE_BAD_PARAMETER;
 953
 954         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 955
 956         BUG_ON(!list_empty(&sem->wait_list));
 957         kfree(sem);
 958         sem = NULL;
 959
 960         return AE_OK;
 961 }
 962
 963 /*
 964  * TODO: Support for units > 1?
 965  */
 966 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 967 {
 968         acpi_status status = AE_OK;
 969         struct semaphore *sem = (struct semaphore *)handle;
 970         long jiffies;
 971         int ret = 0;
 972
 973         if (!sem || (units < 1))
 974                 return AE_BAD_PARAMETER;
 975
 976         if (units > 1)
 977                 return AE_SUPPORT;
 978
 979         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 980                           handle, units, timeout));
 981
 982         if (timeout == ACPI_WAIT_FOREVER)
 983                 jiffies = MAX_SCHEDULE_TIMEOUT;
 984         else
 985                 jiffies = msecs_to_jiffies(timeout);
 986
 987         ret = down_timeout(sem, jiffies);
 988         if (ret)
 989                 status = AE_TIME;
 990
 991         if (ACPI_FAILURE(status)) {
 992                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 993                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 994                                   handle, units, timeout,
 995                                   acpi_format_exception(status)));
 996         } else {
 997                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 998                                   "Acquired semaphore[%p|%d|%d]", handle,
 999                                   units, timeout));
1000         }
1001
1002         return status;
1003 }
1004
1005 /*
1006  * TODO: Support for units > 1?
1007  */
1008 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1009 {
1010         struct semaphore *sem = (struct semaphore *)handle;
1011
1012         if (!sem || (units < 1))
1013                 return AE_BAD_PARAMETER;
1014
1015         if (units > 1)
1016                 return AE_SUPPORT;
1017
1018         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1019                           units));
1020
1021         up(sem);
1022
1023         return AE_OK;
1024 }
1025
1026 #ifdef ACPI_FUTURE_USAGE
1027 u32 acpi_os_get_line(char *buffer)
1028 {
1029
1030 #ifdef ENABLE_DEBUGGER
1031         if (acpi_in_debugger) {
1032                 u32 chars;
1033
1034                 kdb_read(buffer, sizeof(line_buf));
1035
1036                 /* remove the CR kdb includes */
1037                 chars = strlen(buffer) - 1;
1038                 buffer[chars] = '\0';
1039         }
1040 #endif
1041
1042         return 0;
1043 }
1044 #endif                          /*  ACPI_FUTURE_USAGE  */
1045
1046 acpi_status acpi_os_signal(u32 function, void *info)
1047 {
1048         switch (function) {
1049         case ACPI_SIGNAL_FATAL:
1050                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1051                 break;
1052         case ACPI_SIGNAL_BREAKPOINT:
1053                 /*
1054                  * AML Breakpoint
1055                  * ACPI spec. says to treat it as a NOP unless
1056                  * you are debugging.  So if/when we integrate
1057                  * AML debugger into the kernel debugger its
1058                  * hook will go here.  But until then it is
1059                  * not useful to print anything on breakpoints.
1060                  */
1061                 break;
1062         default:
1063                 break;
1064         }
1065
1066         return AE_OK;
1067 }
1068
1069 static int __init acpi_os_name_setup(char *str)
1070 {
1071         char *p = acpi_os_name;
1072         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1073
1074         if (!str || !*str)
1075                 return 0;
1076
1077         for (; count-- && str && *str; str++) {
1078                 if (isalnum(*str) || *str == ' ' || *str == ':')
1079                         *p++ = *str;
1080                 else if (*str == '\'' || *str == '"')
1081                         continue;
1082                 else
1083                         break;
1084         }
1085         *p = 0;
1086
1087         return 1;
1088
1089 }
1090
1091 __setup("acpi_os_name=", acpi_os_name_setup);
1092
1093 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1094 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1095
1096 struct osi_setup_entry {
1097         char string[OSI_STRING_LENGTH_MAX];
1098         bool enable;
1099 };
1100
1101 static struct osi_setup_entry __initdata
1102                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1103         {"Module Device", true},
1104         {"Processor Device", true},
1105         {"3.0 _SCP Extensions", true},
1106         {"Processor Aggregator Device", true},
1107 };
1108
1109 void __init acpi_osi_setup(char *str)
1110 {
1111         struct osi_setup_entry *osi;
1112         bool enable = true;
1113         int i;
1114
1115         if (!acpi_gbl_create_osi_method)
1116                 return;
1117
1118         if (str == NULL || *str == '\0') {
1119                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1120                 acpi_gbl_create_osi_method = FALSE;
1121                 return;
1122         }
1123
1124         if (*str == '!') {
1125                 str++;
1126                 enable = false;
1127         }
1128
1129         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1130                 osi = &osi_setup_entries[i];
1131                 if (!strcmp(osi->string, str)) {
1132                         osi->enable = enable;
1133                         break;
1134                 } else if (osi->string[0] == '\0') {
1135                         osi->enable = enable;
1136                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1137                         break;
1138                 }
1139         }
1140 }
1141
1142 static void __init set_osi_linux(unsigned int enable)
1143 {
1144         if (osi_linux.enable != enable)
1145                 osi_linux.enable = enable;
1146
1147         if (osi_linux.enable)
1148                 acpi_osi_setup("Linux");
1149         else
1150                 acpi_osi_setup("!Linux");
1151
1152         return;
1153 }
1154
1155 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1156 {
1157         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1158         osi_linux.dmi = 0;
1159         set_osi_linux(enable);
1160
1161         return;
1162 }
1163
1164 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1165 {
1166         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1167
1168         if (enable == -1)
1169                 return;
1170
1171         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1172         set_osi_linux(enable);
1173
1174         return;
1175 }
1176
1177 /*
1178  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1179  *
1180  * empty string disables _OSI
1181  * string starting with '!' disables that string
1182  * otherwise string is added to list, augmenting built-in strings
1183  */
1184 static void __init acpi_osi_setup_late(void)
1185 {
1186         struct osi_setup_entry *osi;
1187         char *str;
1188         int i;
1189         acpi_status status;
1190
1191         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1192                 osi = &osi_setup_entries[i];
1193                 str = osi->string;
1194
1195                 if (*str == '\0')
1196                         break;
1197                 if (osi->enable) {
1198                         status = acpi_install_interface(str);
1199
1200                         if (ACPI_SUCCESS(status))
1201                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1202                 } else {
1203                         status = acpi_remove_interface(str);
1204
1205                         if (ACPI_SUCCESS(status))
1206                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1207                 }
1208         }
1209 }
1210
1211 static int __init osi_setup(char *str)
1212 {
1213         if (str && !strcmp("Linux", str))
1214                 acpi_cmdline_osi_linux(1);
1215         else if (str && !strcmp("!Linux", str))
1216                 acpi_cmdline_osi_linux(0);
1217         else
1218                 acpi_osi_setup(str);
1219
1220         return 1;
1221 }
1222
1223 __setup("acpi_osi=", osi_setup);
1224
1225 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1226 static int __init acpi_serialize_setup(char *str)
1227 {
1228         printk(KERN_INFO PREFIX "serialize enabled\n");
1229
1230         acpi_gbl_all_methods_serialized = TRUE;
1231
1232         return 1;
1233 }
1234
1235 __setup("acpi_serialize", acpi_serialize_setup);
1236
1237 /* Check of resource interference between native drivers and ACPI
1238  * OperationRegions (SystemIO and System Memory only).
1239  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1240  * in arbitrary AML code and can interfere with legacy drivers.
1241  * acpi_enforce_resources= can be set to:
1242  *
1243  *   - strict (default) (2)
1244  *     -> further driver trying to access the resources will not load
1245  *   - lax              (1)
1246  *     -> further driver trying to access the resources will load, but you
1247  *     get a system message that something might go wrong...
1248  *
1249  *   - no               (0)
1250  *     -> ACPI Operation Region resources will not be registered
1251  *
1252  */
1253 #define ENFORCE_RESOURCES_STRICT 2
1254 #define ENFORCE_RESOURCES_LAX    1
1255 #define ENFORCE_RESOURCES_NO     0
1256
1257 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1258
1259 static int __init acpi_enforce_resources_setup(char *str)
1260 {
1261         if (str == NULL || *str == '\0')
1262                 return 0;
1263
1264         if (!strcmp("strict", str))
1265                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1266         else if (!strcmp("lax", str))
1267                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1268         else if (!strcmp("no", str))
1269                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1270
1271         return 1;
1272 }
1273
1274 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1275
1276 /* Check for resource conflicts between ACPI OperationRegions and native
1277  * drivers */
1278 int acpi_check_resource_conflict(const struct resource *res)
1279 {
1280         struct acpi_res_list *res_list_elem;
1281         int ioport = 0, clash = 0;
1282
1283         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1284                 return 0;
1285         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1286                 return 0;
1287
1288         ioport = res->flags & IORESOURCE_IO;
1289
1290         spin_lock(&acpi_res_lock);
1291         list_for_each_entry(res_list_elem, &resource_list_head,
1292                             resource_list) {
1293                 if (ioport && (res_list_elem->resource_type
1294                                != ACPI_ADR_SPACE_SYSTEM_IO))
1295                         continue;
1296                 if (!ioport && (res_list_elem->resource_type
1297                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1298                         continue;
1299
1300                 if (res->end < res_list_elem->start
1301                     || res_list_elem->end < res->start)
1302                         continue;
1303                 clash = 1;
1304                 break;
1305         }
1306         spin_unlock(&acpi_res_lock);
1307
1308         if (clash) {
1309                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1310                         printk(KERN_WARNING "ACPI: resource %s %pR"
1311                                " conflicts with ACPI region %s "
1312                                "[%s 0x%zx-0x%zx]\n",
1313                                res->name, res, res_list_elem->name,
1314                                (res_list_elem->resource_type ==
1315                                 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1316                                (size_t) res_list_elem->start,
1317                                (size_t) res_list_elem->end);
1318                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1319                                 printk(KERN_NOTICE "ACPI: This conflict may"
1320                                        " cause random problems and system"
1321                                        " instability\n");
1322                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1323                                " for this device, you should use it instead of"
1324                                " the native driver\n");
1325                 }
1326                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1327                         return -EBUSY;
1328         }
1329         return 0;
1330 }
1331 EXPORT_SYMBOL(acpi_check_resource_conflict);
1332
1333 int acpi_check_region(resource_size_t start, resource_size_t n,
1334                       const char *name)
1335 {
1336         struct resource res = {
1337                 .start = start,
1338                 .end   = start + n - 1,
1339                 .name  = name,
1340                 .flags = IORESOURCE_IO,
1341         };
1342
1343         return acpi_check_resource_conflict(&res);
1344 }
1345 EXPORT_SYMBOL(acpi_check_region);
1346
1347 /*
1348  * Let drivers know whether the resource checks are effective
1349  */
1350 int acpi_resources_are_enforced(void)
1351 {
1352         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1353 }
1354 EXPORT_SYMBOL(acpi_resources_are_enforced);
1355
1356 /*
1357  * Deallocate the memory for a spinlock.
1358  */
1359 void acpi_os_delete_lock(acpi_spinlock handle)
1360 {
1361         ACPI_FREE(handle);
1362 }
1363
1364 /*
1365  * Acquire a spinlock.
1366  *
1367  * handle is a pointer to the spinlock_t.
1368  */
1369
1370 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1371 {
1372         acpi_cpu_flags flags;
1373         spin_lock_irqsave(lockp, flags);
1374         return flags;
1375 }
1376
1377 /*
1378  * Release a spinlock. See above.
1379  */
1380
1381 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1382 {
1383         spin_unlock_irqrestore(lockp, flags);
1384 }
1385
1386 #ifndef ACPI_USE_LOCAL_CACHE
1387
1388 /*******************************************************************************
1389  *
1390  * FUNCTION:    acpi_os_create_cache
1391  *
1392  * PARAMETERS:  name      - Ascii name for the cache
1393  *              size      - Size of each cached object
1394  *              depth     - Maximum depth of the cache (in objects) <ignored>
1395  *              cache     - Where the new cache object is returned
1396  *
1397  * RETURN:      status
1398  *
1399  * DESCRIPTION: Create a cache object
1400  *
1401  ******************************************************************************/
1402
1403 acpi_status
1404 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1405 {
1406         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1407         if (*cache == NULL)
1408                 return AE_ERROR;
1409         else
1410                 return AE_OK;
1411 }
1412
1413 /*******************************************************************************
1414  *
1415  * FUNCTION:    acpi_os_purge_cache
1416  *
1417  * PARAMETERS:  Cache           - Handle to cache object
1418  *
1419  * RETURN:      Status
1420  *
1421  * DESCRIPTION: Free all objects within the requested cache.
1422  *
1423  ******************************************************************************/
1424
1425 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1426 {
1427         kmem_cache_shrink(cache);
1428         return (AE_OK);
1429 }
1430
1431 /*******************************************************************************
1432  *
1433  * FUNCTION:    acpi_os_delete_cache
1434  *
1435  * PARAMETERS:  Cache           - Handle to cache object
1436  *
1437  * RETURN:      Status
1438  *
1439  * DESCRIPTION: Free all objects within the requested cache and delete the
1440  *              cache object.
1441  *
1442  ******************************************************************************/
1443
1444 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1445 {
1446         kmem_cache_destroy(cache);
1447         return (AE_OK);
1448 }
1449
1450 /*******************************************************************************
1451  *
1452  * FUNCTION:    acpi_os_release_object
1453  *
1454  * PARAMETERS:  Cache       - Handle to cache object
1455  *              Object      - The object to be released
1456  *
1457  * RETURN:      None
1458  *
1459  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1460  *              the object is deleted.
1461  *
1462  ******************************************************************************/
1463
1464 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1465 {
1466         kmem_cache_free(cache, object);
1467         return (AE_OK);
1468 }
1469
1470 static inline int acpi_res_list_add(struct acpi_res_list *res)
1471 {
1472         struct acpi_res_list *res_list_elem;
1473
1474         list_for_each_entry(res_list_elem, &resource_list_head,
1475                             resource_list) {
1476
1477                 if (res->resource_type == res_list_elem->resource_type &&
1478                     res->start == res_list_elem->start &&
1479                     res->end == res_list_elem->end) {
1480
1481                         /*
1482                          * The Region(addr,len) already exist in the list,
1483                          * just increase the count
1484                          */
1485
1486                         res_list_elem->count++;
1487                         return 0;
1488                 }
1489         }
1490
1491         res->count = 1;
1492         list_add(&res->resource_list, &resource_list_head);
1493         return 1;
1494 }
1495
1496 static inline void acpi_res_list_del(struct acpi_res_list *res)
1497 {
1498         struct acpi_res_list *res_list_elem;
1499
1500         list_for_each_entry(res_list_elem, &resource_list_head,
1501                             resource_list) {
1502
1503                 if (res->resource_type == res_list_elem->resource_type &&
1504                     res->start == res_list_elem->start &&
1505                     res->end == res_list_elem->end) {
1506
1507                         /*
1508                          * If the res count is decreased to 0,
1509                          * remove and free it
1510                          */
1511
1512                         if (--res_list_elem->count == 0) {
1513                                 list_del(&res_list_elem->resource_list);
1514                                 kfree(res_list_elem);
1515                         }
1516                         return;
1517                 }
1518         }
1519 }
1520
1521 acpi_status
1522 acpi_os_invalidate_address(
1523     u8                   space_id,
1524     acpi_physical_address   address,
1525     acpi_size               length)
1526 {
1527         struct acpi_res_list res;
1528
1529         switch (space_id) {
1530         case ACPI_ADR_SPACE_SYSTEM_IO:
1531         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1532                 /* Only interference checks against SystemIO and SystemMemory
1533                    are needed */
1534                 res.start = address;
1535                 res.end = address + length - 1;
1536                 res.resource_type = space_id;
1537                 spin_lock(&acpi_res_lock);
1538                 acpi_res_list_del(&res);
1539                 spin_unlock(&acpi_res_lock);
1540                 break;
1541         case ACPI_ADR_SPACE_PCI_CONFIG:
1542         case ACPI_ADR_SPACE_EC:
1543         case ACPI_ADR_SPACE_SMBUS:
1544         case ACPI_ADR_SPACE_CMOS:
1545         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1546         case ACPI_ADR_SPACE_DATA_TABLE:
1547         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1548                 break;
1549         }
1550         return AE_OK;
1551 }
1552
1553 /******************************************************************************
1554  *
1555  * FUNCTION:    acpi_os_validate_address
1556  *
1557  * PARAMETERS:  space_id             - ACPI space ID
1558  *              address             - Physical address
1559  *              length              - Address length
1560  *
1561  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1562  *              should return AE_AML_ILLEGAL_ADDRESS.
1563  *
1564  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1565  *              the addresses accessed by AML operation regions.
1566  *
1567  *****************************************************************************/
1568
1569 acpi_status
1570 acpi_os_validate_address (
1571     u8                   space_id,
1572     acpi_physical_address   address,
1573     acpi_size               length,
1574     char *name)
1575 {
1576         struct acpi_res_list *res;
1577         int added;
1578         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1579                 return AE_OK;
1580
1581         switch (space_id) {
1582         case ACPI_ADR_SPACE_SYSTEM_IO:
1583         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1584                 /* Only interference checks against SystemIO and SystemMemory
1585                    are needed */
1586                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1587                 if (!res)
1588                         return AE_OK;
1589                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1590                 strlcpy(res->name, name, 5);
1591                 res->start = address;
1592                 res->end = address + length - 1;
1593                 res->resource_type = space_id;
1594                 spin_lock(&acpi_res_lock);
1595                 added = acpi_res_list_add(res);
1596                 spin_unlock(&acpi_res_lock);
1597                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1598                          "name: %s\n", added ? "Added" : "Already exist",
1599                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1600                          ? "SystemIO" : "System Memory",
1601                          (unsigned long long)res->start,
1602                          (unsigned long long)res->end,
1603                          res->name);
1604                 if (!added)
1605                         kfree(res);
1606                 break;
1607         case ACPI_ADR_SPACE_PCI_CONFIG:
1608         case ACPI_ADR_SPACE_EC:
1609         case ACPI_ADR_SPACE_SMBUS:
1610         case ACPI_ADR_SPACE_CMOS:
1611         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1612         case ACPI_ADR_SPACE_DATA_TABLE:
1613         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1614                 break;
1615         }
1616         return AE_OK;
1617 }
1618 #endif
1619
1620 acpi_status __init acpi_os_initialize(void)
1621 {
1622         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1623         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1624         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1625         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1626
1627         return AE_OK;
1628 }
1629
1630 acpi_status __init acpi_os_initialize1(void)
1631 {
1632         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1633         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1634         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1635         BUG_ON(!kacpid_wq);
1636         BUG_ON(!kacpi_notify_wq);
1637         BUG_ON(!kacpi_hotplug_wq);
1638         acpi_install_interface_handler(acpi_osi_handler);
1639         acpi_osi_setup_late();
1640         return AE_OK;
1641 }
1642
1643 acpi_status acpi_os_terminate(void)
1644 {
1645         if (acpi_irq_handler) {
1646                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1647                                                  acpi_irq_handler);
1648         }
1649
1650         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1651         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1652         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1653         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1654
1655         destroy_workqueue(kacpid_wq);
1656         destroy_workqueue(kacpi_notify_wq);
1657         destroy_workqueue(kacpi_hotplug_wq);
1658
1659         return AE_OK;
1660 }