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 struct workqueue_struct *kacpi_hotplug_wq;
  84 EXPORT_SYMBOL(kacpi_hotplug_wq);
  85 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  86
  87 struct acpi_res_list {
  88         resource_size_t start;
  89         resource_size_t end;
  90         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  91         char name[5];   /* only can have a length of 4 chars, make use of this
  92                            one instead of res->name, no need to kalloc then */
  93         struct list_head resource_list;
  94         int count;
  95 };
  96
  97 static LIST_HEAD(resource_list_head);
  98 static DEFINE_SPINLOCK(acpi_res_lock);
  99
 100 /*
 101  * This list of permanent mappings is for memory that may be accessed from
 102  * interrupt context, where we can't do the ioremap().
 103  */
 104 struct acpi_ioremap {
 105         struct list_head list;
 106         void __iomem *virt;
 107         acpi_physical_address phys;
 108         acpi_size size;
 109         unsigned long refcount;
 110 };
 111
 112 static LIST_HEAD(acpi_ioremaps);
 113 static DEFINE_MUTEX(acpi_ioremap_lock);
 114
 115 static void __init acpi_osi_setup_late(void);
 116
 117 /*
 118  * The story of _OSI(Linux)
 119  *
 120  * From pre-history through Linux-2.6.22,
 121  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 122  *
 123  * Unfortunately, reference BIOS writers got wind of this
 124  * and put OSI(Linux) in their example code, quickly exposing
 125  * this string as ill-conceived and opening the door to
 126  * an un-bounded number of BIOS incompatibilities.
 127  *
 128  * For example, OSI(Linux) was used on resume to re-POST a
 129  * video card on one system, because Linux at that time
 130  * could not do a speedy restore in its native driver.
 131  * But then upon gaining quick native restore capability,
 132  * Linux has no way to tell the BIOS to skip the time-consuming
 133  * POST -- putting Linux at a permanent performance disadvantage.
 134  * On another system, the BIOS writer used OSI(Linux)
 135  * to infer native OS support for IPMI!  On other systems,
 136  * OSI(Linux) simply got in the way of Linux claiming to
 137  * be compatible with other operating systems, exposing
 138  * BIOS issues such as skipped device initialization.
 139  *
 140  * So "Linux" turned out to be a really poor chose of
 141  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 142  *
 143  * BIOS writers should NOT query _OSI(Linux) on future systems.
 144  * Linux will complain on the console when it sees it, and return FALSE.
 145  * To get Linux to return TRUE for your system  will require
 146  * a kernel source update to add a DMI entry,
 147  * or boot with "acpi_osi=Linux"
 148  */
 149
 150 static struct osi_linux {
 151         unsigned int    enable:1;
 152         unsigned int    dmi:1;
 153         unsigned int    cmdline:1;
 154 } osi_linux = {0, 0, 0};
 155
 156 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 157 {
 158         if (!strcmp("Linux", interface)) {
 159
 160                 printk_once(KERN_NOTICE FW_BUG PREFIX
 161                         "BIOS _OSI(Linux) query %s%s\n",
 162                         osi_linux.enable ? "honored" : "ignored",
 163                         osi_linux.cmdline ? " via cmdline" :
 164                         osi_linux.dmi ? " via DMI" : "");
 165         }
 166
 167         return supported;
 168 }
 169
 170 static void __init acpi_request_region (struct acpi_generic_address *addr,
 171         unsigned int length, char *desc)
 172 {
 173         if (!addr->address || !length)
 174                 return;
 175
 176         /* Resources are never freed */
 177         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 178                 request_region(addr->address, length, desc);
 179         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 180                 request_mem_region(addr->address, length, desc);
 181 }
 182
 183 static void __init acpi_reserve_resources(void)
 184 {
 185         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 186                 "ACPI PM1a_EVT_BLK");
 187
 188         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 189                 "ACPI PM1b_EVT_BLK");
 190
 191         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 192                 "ACPI PM1a_CNT_BLK");
 193
 194         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 195                 "ACPI PM1b_CNT_BLK");
 196
 197         if (acpi_gbl_FADT.pm_timer_length == 4)
 198                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 199
 200         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 201                 "ACPI PM2_CNT_BLK");
 202
 203         /* Length of GPE blocks must be a non-negative multiple of 2 */
 204
 205         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 206                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 207                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 208
 209         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 210                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 211                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 212 }
 213
 214 void acpi_os_printf(const char *fmt, ...)
 215 {
 216         va_list args;
 217         va_start(args, fmt);
 218         acpi_os_vprintf(fmt, args);
 219         va_end(args);
 220 }
 221
 222 void acpi_os_vprintf(const char *fmt, va_list args)
 223 {
 224         static char buffer[512];
 225
 226         vsprintf(buffer, fmt, args);
 227
 228 #ifdef ENABLE_DEBUGGER
 229         if (acpi_in_debugger) {
 230                 kdb_printf("%s", buffer);
 231         } else {
 232                 printk(KERN_CONT "%s", buffer);
 233         }
 234 #else
 235         printk(KERN_CONT "%s", buffer);
 236 #endif
 237 }
 238
 239 #ifdef CONFIG_KEXEC
 240 static unsigned long acpi_rsdp;
 241 static int __init setup_acpi_rsdp(char *arg)
 242 {
 243         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 244         return 0;
 245 }
 246 early_param("acpi_rsdp", setup_acpi_rsdp);
 247 #endif
 248
 249 acpi_physical_address __init acpi_os_get_root_pointer(void)
 250 {
 251 #ifdef CONFIG_KEXEC
 252         if (acpi_rsdp)
 253                 return acpi_rsdp;
 254 #endif
 255
 256         if (efi_enabled(EFI_CONFIG_TABLES)) {
 257                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 258                         return efi.acpi20;
 259                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 260                         return efi.acpi;
 261                 else {
 262                         printk(KERN_ERR PREFIX
 263                                "System description tables not found\n");
 264                         return 0;
 265                 }
 266         } else {
 267                 acpi_physical_address pa = 0;
 268
 269                 acpi_find_root_pointer(&pa);
 270                 return pa;
 271         }
 272 }
 273
 274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 275 static struct acpi_ioremap *
 276 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 277 {
 278         struct acpi_ioremap *map;
 279
 280         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 281                 if (map->phys <= phys &&
 282                     phys + size <= map->phys + map->size)
 283                         return map;
 284
 285         return NULL;
 286 }
 287
 288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 289 static void __iomem *
 290 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 291 {
 292         struct acpi_ioremap *map;
 293
 294         map = acpi_map_lookup(phys, size);
 295         if (map)
 296                 return map->virt + (phys - map->phys);
 297
 298         return NULL;
 299 }
 300
 301 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 302 {
 303         struct acpi_ioremap *map;
 304         void __iomem *virt = NULL;
 305
 306         mutex_lock(&acpi_ioremap_lock);
 307         map = acpi_map_lookup(phys, size);
 308         if (map) {
 309                 virt = map->virt + (phys - map->phys);
 310                 map->refcount++;
 311         }
 312         mutex_unlock(&acpi_ioremap_lock);
 313         return virt;
 314 }
 315 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 316
 317 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 318 static struct acpi_ioremap *
 319 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 320 {
 321         struct acpi_ioremap *map;
 322
 323         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 324                 if (map->virt <= virt &&
 325                     virt + size <= map->virt + map->size)
 326                         return map;
 327
 328         return NULL;
 329 }
 330
 331 void __iomem *__init_refok
 332 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 333 {
 334         struct acpi_ioremap *map;
 335         void __iomem *virt;
 336         acpi_physical_address pg_off;
 337         acpi_size pg_sz;
 338
 339         if (phys > ULONG_MAX) {
 340                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 341                 return NULL;
 342         }
 343
 344         if (!acpi_gbl_permanent_mmap)
 345                 return __acpi_map_table((unsigned long)phys, size);
 346
 347         mutex_lock(&acpi_ioremap_lock);
 348         /* Check if there's a suitable mapping already. */
 349         map = acpi_map_lookup(phys, size);
 350         if (map) {
 351                 map->refcount++;
 352                 goto out;
 353         }
 354
 355         map = kzalloc(sizeof(*map), GFP_KERNEL);
 356         if (!map) {
 357                 mutex_unlock(&acpi_ioremap_lock);
 358                 return NULL;
 359         }
 360
 361         pg_off = round_down(phys, PAGE_SIZE);
 362         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 363         virt = acpi_os_ioremap(pg_off, pg_sz);
 364         if (!virt) {
 365                 mutex_unlock(&acpi_ioremap_lock);
 366                 kfree(map);
 367                 return NULL;
 368         }
 369
 370         INIT_LIST_HEAD(&map->list);
 371         map->virt = virt;
 372         map->phys = pg_off;
 373         map->size = pg_sz;
 374         map->refcount = 1;
 375
 376         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 377
 378  out:
 379         mutex_unlock(&acpi_ioremap_lock);
 380         return map->virt + (phys - map->phys);
 381 }
 382 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 383
 384 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 385 {
 386         if (!--map->refcount)
 387                 list_del_rcu(&map->list);
 388 }
 389
 390 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 391 {
 392         if (!map->refcount) {
 393                 synchronize_rcu();
 394                 iounmap(map->virt);
 395                 kfree(map);
 396         }
 397 }
 398
 399 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 400 {
 401         struct acpi_ioremap *map;
 402
 403         if (!acpi_gbl_permanent_mmap) {
 404                 __acpi_unmap_table(virt, size);
 405                 return;
 406         }
 407
 408         mutex_lock(&acpi_ioremap_lock);
 409         map = acpi_map_lookup_virt(virt, size);
 410         if (!map) {
 411                 mutex_unlock(&acpi_ioremap_lock);
 412                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 413                 return;
 414         }
 415         acpi_os_drop_map_ref(map);
 416         mutex_unlock(&acpi_ioremap_lock);
 417
 418         acpi_os_map_cleanup(map);
 419 }
 420 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 421
 422 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 423 {
 424         if (!acpi_gbl_permanent_mmap)
 425                 __acpi_unmap_table(virt, size);
 426 }
 427
 428 static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 429 {
 430         void __iomem *virt;
 431
 432         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 433                 return 0;
 434
 435         if (!addr->address || !addr->bit_width)
 436                 return -EINVAL;
 437
 438         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 439         if (!virt)
 440                 return -EIO;
 441
 442         return 0;
 443 }
 444
 445 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 446 {
 447         struct acpi_ioremap *map;
 448
 449         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 450                 return;
 451
 452         if (!addr->address || !addr->bit_width)
 453                 return;
 454
 455         mutex_lock(&acpi_ioremap_lock);
 456         map = acpi_map_lookup(addr->address, addr->bit_width / 8);
 457         if (!map) {
 458                 mutex_unlock(&acpi_ioremap_lock);
 459                 return;
 460         }
 461         acpi_os_drop_map_ref(map);
 462         mutex_unlock(&acpi_ioremap_lock);
 463
 464         acpi_os_map_cleanup(map);
 465 }
 466
 467 #ifdef ACPI_FUTURE_USAGE
 468 acpi_status
 469 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 470 {
 471         if (!phys || !virt)
 472                 return AE_BAD_PARAMETER;
 473
 474         *phys = virt_to_phys(virt);
 475
 476         return AE_OK;
 477 }
 478 #endif
 479
 480 #define ACPI_MAX_OVERRIDE_LEN 100
 481
 482 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 483
 484 acpi_status
 485 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 486                             acpi_string * new_val)
 487 {
 488         if (!init_val || !new_val)
 489                 return AE_BAD_PARAMETER;
 490
 491         *new_val = NULL;
 492         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 493                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 494                        acpi_os_name);
 495                 *new_val = acpi_os_name;
 496         }
 497
 498         return AE_OK;
 499 }
 500
 501 acpi_status
 502 acpi_os_table_override(struct acpi_table_header * existing_table,
 503                        struct acpi_table_header ** new_table)
 504 {
 505         if (!existing_table || !new_table)
 506                 return AE_BAD_PARAMETER;
 507
 508         *new_table = NULL;
 509
 510 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 511         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 512                 *new_table = (struct acpi_table_header *)AmlCode;
 513 #endif
 514         if (*new_table != NULL) {
 515                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 516                            "this is unsafe: tainting kernel\n",
 517                        existing_table->signature,
 518                        existing_table->oem_table_id);
 519                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 520         }
 521         return AE_OK;
 522 }
 523
 524 static irqreturn_t acpi_irq(int irq, void *dev_id)
 525 {
 526         u32 handled;
 527
 528         handled = (*acpi_irq_handler) (acpi_irq_context);
 529
 530         if (handled) {
 531                 acpi_irq_handled++;
 532                 return IRQ_HANDLED;
 533         } else {
 534                 acpi_irq_not_handled++;
 535                 return IRQ_NONE;
 536         }
 537 }
 538
 539 acpi_status
 540 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 541                                   void *context)
 542 {
 543         unsigned int irq;
 544
 545         acpi_irq_stats_init();
 546
 547         /*
 548          * ACPI interrupts different from the SCI in our copy of the FADT are
 549          * not supported.
 550          */
 551         if (gsi != acpi_gbl_FADT.sci_interrupt)
 552                 return AE_BAD_PARAMETER;
 553
 554         if (acpi_irq_handler)
 555                 return AE_ALREADY_ACQUIRED;
 556
 557         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 558                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 559                        gsi);
 560                 return AE_OK;
 561         }
 562
 563         acpi_irq_handler = handler;
 564         acpi_irq_context = context;
 565         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 566                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 567                 acpi_irq_handler = NULL;
 568                 return AE_NOT_ACQUIRED;
 569         }
 570         acpi_sci_irq = irq;
 571
 572         return AE_OK;
 573 }
 574
 575 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 576 {
 577         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 578                 return AE_BAD_PARAMETER;
 579
 580         free_irq(acpi_sci_irq, acpi_irq);
 581         acpi_irq_handler = NULL;
 582         acpi_sci_irq = INVALID_ACPI_IRQ;
 583
 584         return AE_OK;
 585 }
 586
 587 /*
 588  * Running in interpreter thread context, safe to sleep
 589  */
 590
 591 void acpi_os_sleep(u64 ms)
 592 {
 593         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 594 }
 595
 596 void acpi_os_stall(u32 us)
 597 {
 598         while (us) {
 599                 u32 delay = 1000;
 600
 601                 if (delay > us)
 602                         delay = us;
 603                 udelay(delay);
 604                 touch_nmi_watchdog();
 605                 us -= delay;
 606         }
 607 }
 608
 609 /*
 610  * Support ACPI 3.0 AML Timer operand
 611  * Returns 64-bit free-running, monotonically increasing timer
 612  * with 100ns granularity
 613  */
 614 u64 acpi_os_get_timer(void)
 615 {
 616         static u64 t;
 617
 618 #ifdef  CONFIG_HPET
 619         /* TBD: use HPET if available */
 620 #endif
 621
 622 #ifdef  CONFIG_X86_PM_TIMER
 623         /* TBD: default to PM timer if HPET was not available */
 624 #endif
 625         if (!t)
 626                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 627
 628         return ++t;
 629 }
 630
 631 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 632 {
 633         u32 dummy;
 634
 635         if (!value)
 636                 value = &dummy;
 637
 638         *value = 0;
 639         if (width <= 8) {
 640                 *(u8 *) value = inb(port);
 641         } else if (width <= 16) {
 642                 *(u16 *) value = inw(port);
 643         } else if (width <= 32) {
 644                 *(u32 *) value = inl(port);
 645         } else {
 646                 BUG();
 647         }
 648
 649         return AE_OK;
 650 }
 651
 652 EXPORT_SYMBOL(acpi_os_read_port);
 653
 654 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 655 {
 656         if (width <= 8) {
 657                 outb(value, port);
 658         } else if (width <= 16) {
 659                 outw(value, port);
 660         } else if (width <= 32) {
 661                 outl(value, port);
 662         } else {
 663                 BUG();
 664         }
 665
 666         return AE_OK;
 667 }
 668
 669 EXPORT_SYMBOL(acpi_os_write_port);
 670
 671 acpi_status
 672 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 673 {
 674         void __iomem *virt_addr;
 675         unsigned int size = width / 8;
 676         bool unmap = false;
 677         u32 dummy;
 678
 679         rcu_read_lock();
 680         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 681         if (!virt_addr) {
 682                 rcu_read_unlock();
 683                 virt_addr = acpi_os_ioremap(phys_addr, size);
 684                 if (!virt_addr)
 685                         return AE_BAD_ADDRESS;
 686                 unmap = true;
 687         }
 688
 689         if (!value)
 690                 value = &dummy;
 691
 692         switch (width) {
 693         case 8:
 694                 *(u8 *) value = readb(virt_addr);
 695                 break;
 696         case 16:
 697                 *(u16 *) value = readw(virt_addr);
 698                 break;
 699         case 32:
 700                 *(u32 *) value = readl(virt_addr);
 701                 break;
 702         default:
 703                 BUG();
 704         }
 705
 706         if (unmap)
 707                 iounmap(virt_addr);
 708         else
 709                 rcu_read_unlock();
 710
 711         return AE_OK;
 712 }
 713
 714 acpi_status
 715 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 716 {
 717         void __iomem *virt_addr;
 718         unsigned int size = width / 8;
 719         bool unmap = false;
 720
 721         rcu_read_lock();
 722         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 723         if (!virt_addr) {
 724                 rcu_read_unlock();
 725                 virt_addr = acpi_os_ioremap(phys_addr, size);
 726                 if (!virt_addr)
 727                         return AE_BAD_ADDRESS;
 728                 unmap = true;
 729         }
 730
 731         switch (width) {
 732         case 8:
 733                 writeb(value, virt_addr);
 734                 break;
 735         case 16:
 736                 writew(value, virt_addr);
 737                 break;
 738         case 32:
 739                 writel(value, virt_addr);
 740                 break;
 741         default:
 742                 BUG();
 743         }
 744
 745         if (unmap)
 746                 iounmap(virt_addr);
 747         else
 748                 rcu_read_unlock();
 749
 750         return AE_OK;
 751 }
 752
 753 acpi_status
 754 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 755                                u64 *value, u32 width)
 756 {
 757         int result, size;
 758         u32 value32;
 759
 760         if (!value)
 761                 return AE_BAD_PARAMETER;
 762
 763         switch (width) {
 764         case 8:
 765                 size = 1;
 766                 break;
 767         case 16:
 768                 size = 2;
 769                 break;
 770         case 32:
 771                 size = 4;
 772                 break;
 773         default:
 774                 return AE_ERROR;
 775         }
 776
 777         result = raw_pci_read(pci_id->segment, pci_id->bus,
 778                                 PCI_DEVFN(pci_id->device, pci_id->function),
 779                                 reg, size, &value32);
 780         *value = value32;
 781
 782         return (result ? AE_ERROR : AE_OK);
 783 }
 784
 785 acpi_status
 786 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 787                                 u64 value, u32 width)
 788 {
 789         int result, size;
 790
 791         switch (width) {
 792         case 8:
 793                 size = 1;
 794                 break;
 795         case 16:
 796                 size = 2;
 797                 break;
 798         case 32:
 799                 size = 4;
 800                 break;
 801         default:
 802                 return AE_ERROR;
 803         }
 804
 805         result = raw_pci_write(pci_id->segment, pci_id->bus,
 806                                 PCI_DEVFN(pci_id->device, pci_id->function),
 807                                 reg, size, value);
 808
 809         return (result ? AE_ERROR : AE_OK);
 810 }
 811
 812 static void acpi_os_execute_deferred(struct work_struct *work)
 813 {
 814         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 815
 816         if (dpc->wait)
 817                 acpi_os_wait_events_complete(NULL);
 818
 819         dpc->function(dpc->context);
 820         kfree(dpc);
 821 }
 822
 823 /*******************************************************************************
 824  *
 825  * FUNCTION:    acpi_os_execute
 826  *
 827  * PARAMETERS:  Type               - Type of the callback
 828  *              Function           - Function to be executed
 829  *              Context            - Function parameters
 830  *
 831  * RETURN:      Status
 832  *
 833  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 834  *              immediately executes function on a separate thread.
 835  *
 836  ******************************************************************************/
 837
 838 static acpi_status __acpi_os_execute(acpi_execute_type type,
 839         acpi_osd_exec_callback function, void *context, int hp)
 840 {
 841         acpi_status status = AE_OK;
 842         struct acpi_os_dpc *dpc;
 843         struct workqueue_struct *queue;
 844         int ret;
 845         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 846                           "Scheduling function [%p(%p)] for deferred execution.\n",
 847                           function, context));
 848
 849         /*
 850          * Allocate/initialize DPC structure.  Note that this memory will be
 851          * freed by the callee.  The kernel handles the work_struct list  in a
 852          * way that allows us to also free its memory inside the callee.
 853          * Because we may want to schedule several tasks with different
 854          * parameters we can't use the approach some kernel code uses of
 855          * having a static work_struct.
 856          */
 857
 858         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 859         if (!dpc)
 860                 return AE_NO_MEMORY;
 861
 862         dpc->function = function;
 863         dpc->context = context;
 864
 865         /*
 866          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 867          * because the hotplug code may call driver .remove() functions,
 868          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 869          * to flush these workqueues.
 870          */
 871         queue = hp ? kacpi_hotplug_wq :
 872                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 873         dpc->wait = hp ? 1 : 0;
 874
 875         if (queue == kacpi_hotplug_wq)
 876                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 877         else if (queue == kacpi_notify_wq)
 878                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 879         else
 880                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 881
 882         /*
 883          * On some machines, a software-initiated SMI causes corruption unless
 884          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 885          * typically it's done in GPE-related methods that are run via
 886          * workqueues, so we can avoid the known corruption cases by always
 887          * queueing on CPU 0.
 888          */
 889         ret = queue_work_on(0, queue, &dpc->work);
 890
 891         if (!ret) {
 892                 printk(KERN_ERR PREFIX
 893                           "Call to queue_work() failed.\n");
 894                 status = AE_ERROR;
 895                 kfree(dpc);
 896         }
 897         return status;
 898 }
 899
 900 acpi_status acpi_os_execute(acpi_execute_type type,
 901                             acpi_osd_exec_callback function, void *context)
 902 {
 903         return __acpi_os_execute(type, function, context, 0);
 904 }
 905 EXPORT_SYMBOL(acpi_os_execute);
 906
 907 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 908         void *context)
 909 {
 910         return __acpi_os_execute(0, function, context, 1);
 911 }
 912
 913 void acpi_os_wait_events_complete(void *context)
 914 {
 915         flush_workqueue(kacpid_wq);
 916         flush_workqueue(kacpi_notify_wq);
 917 }
 918
 919 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 920
 921 acpi_status
 922 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 923 {
 924         struct semaphore *sem = NULL;
 925
 926         sem = acpi_os_allocate(sizeof(struct semaphore));
 927         if (!sem)
 928                 return AE_NO_MEMORY;
 929         memset(sem, 0, sizeof(struct semaphore));
 930
 931         sema_init(sem, initial_units);
 932
 933         *handle = (acpi_handle *) sem;
 934
 935         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 936                           *handle, initial_units));
 937
 938         return AE_OK;
 939 }
 940
 941 /*
 942  * TODO: A better way to delete semaphores?  Linux doesn't have a
 943  * 'delete_semaphore()' function -- may result in an invalid
 944  * pointer dereference for non-synchronized consumers.  Should
 945  * we at least check for blocked threads and signal/cancel them?
 946  */
 947
 948 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 949 {
 950         struct semaphore *sem = (struct semaphore *)handle;
 951
 952         if (!sem)
 953                 return AE_BAD_PARAMETER;
 954
 955         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 956
 957         BUG_ON(!list_empty(&sem->wait_list));
 958         kfree(sem);
 959         sem = NULL;
 960
 961         return AE_OK;
 962 }
 963
 964 /*
 965  * TODO: Support for units > 1?
 966  */
 967 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 968 {
 969         acpi_status status = AE_OK;
 970         struct semaphore *sem = (struct semaphore *)handle;
 971         long jiffies;
 972         int ret = 0;
 973
 974         if (!sem || (units < 1))
 975                 return AE_BAD_PARAMETER;
 976
 977         if (units > 1)
 978                 return AE_SUPPORT;
 979
 980         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 981                           handle, units, timeout));
 982
 983         if (timeout == ACPI_WAIT_FOREVER)
 984                 jiffies = MAX_SCHEDULE_TIMEOUT;
 985         else
 986                 jiffies = msecs_to_jiffies(timeout);
 987
 988         ret = down_timeout(sem, jiffies);
 989         if (ret)
 990                 status = AE_TIME;
 991
 992         if (ACPI_FAILURE(status)) {
 993                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 994                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 995                                   handle, units, timeout,
 996                                   acpi_format_exception(status)));
 997         } else {
 998                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 999                                   "Acquired semaphore[%p|%d|%d]", handle,
1000                                   units, timeout));
1001         }
1002
1003         return status;
1004 }
1005
1006 /*
1007  * TODO: Support for units > 1?
1008  */
1009 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1010 {
1011         struct semaphore *sem = (struct semaphore *)handle;
1012
1013         if (!sem || (units < 1))
1014                 return AE_BAD_PARAMETER;
1015
1016         if (units > 1)
1017                 return AE_SUPPORT;
1018
1019         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1020                           units));
1021
1022         up(sem);
1023
1024         return AE_OK;
1025 }
1026
1027 #ifdef ACPI_FUTURE_USAGE
1028 u32 acpi_os_get_line(char *buffer)
1029 {
1030
1031 #ifdef ENABLE_DEBUGGER
1032         if (acpi_in_debugger) {
1033                 u32 chars;
1034
1035                 kdb_read(buffer, sizeof(line_buf));
1036
1037                 /* remove the CR kdb includes */
1038                 chars = strlen(buffer) - 1;
1039                 buffer[chars] = '\0';
1040         }
1041 #endif
1042
1043         return 0;
1044 }
1045 #endif                          /*  ACPI_FUTURE_USAGE  */
1046
1047 acpi_status acpi_os_signal(u32 function, void *info)
1048 {
1049         switch (function) {
1050         case ACPI_SIGNAL_FATAL:
1051                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1052                 break;
1053         case ACPI_SIGNAL_BREAKPOINT:
1054                 /*
1055                  * AML Breakpoint
1056                  * ACPI spec. says to treat it as a NOP unless
1057                  * you are debugging.  So if/when we integrate
1058                  * AML debugger into the kernel debugger its
1059                  * hook will go here.  But until then it is
1060                  * not useful to print anything on breakpoints.
1061                  */
1062                 break;
1063         default:
1064                 break;
1065         }
1066
1067         return AE_OK;
1068 }
1069
1070 static int __init acpi_os_name_setup(char *str)
1071 {
1072         char *p = acpi_os_name;
1073         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1074
1075         if (!str || !*str)
1076                 return 0;
1077
1078         for (; count-- && str && *str; str++) {
1079                 if (isalnum(*str) || *str == ' ' || *str == ':')
1080                         *p++ = *str;
1081                 else if (*str == '\'' || *str == '"')
1082                         continue;
1083                 else
1084                         break;
1085         }
1086         *p = 0;
1087
1088         return 1;
1089
1090 }
1091
1092 __setup("acpi_os_name=", acpi_os_name_setup);
1093
1094 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1095 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1096
1097 struct osi_setup_entry {
1098         char string[OSI_STRING_LENGTH_MAX];
1099         bool enable;
1100 };
1101
1102 static struct osi_setup_entry __initdata
1103                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1104         {"Module Device", true},
1105         {"Processor Device", true},
1106         {"3.0 _SCP Extensions", true},
1107         {"Processor Aggregator Device", true},
1108 };
1109
1110 void __init acpi_osi_setup(char *str)
1111 {
1112         struct osi_setup_entry *osi;
1113         bool enable = true;
1114         int i;
1115
1116         if (!acpi_gbl_create_osi_method)
1117                 return;
1118
1119         if (str == NULL || *str == '\0') {
1120                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1121                 acpi_gbl_create_osi_method = FALSE;
1122                 return;
1123         }
1124
1125         if (*str == '!') {
1126                 str++;
1127                 enable = false;
1128         }
1129
1130         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1131                 osi = &osi_setup_entries[i];
1132                 if (!strcmp(osi->string, str)) {
1133                         osi->enable = enable;
1134                         break;
1135                 } else if (osi->string[0] == '\0') {
1136                         osi->enable = enable;
1137                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1138                         break;
1139                 }
1140         }
1141 }
1142
1143 static void __init set_osi_linux(unsigned int enable)
1144 {
1145         if (osi_linux.enable != enable)
1146                 osi_linux.enable = enable;
1147
1148         if (osi_linux.enable)
1149                 acpi_osi_setup("Linux");
1150         else
1151                 acpi_osi_setup("!Linux");
1152
1153         return;
1154 }
1155
1156 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1157 {
1158         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1159         osi_linux.dmi = 0;
1160         set_osi_linux(enable);
1161
1162         return;
1163 }
1164
1165 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1166 {
1167         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1168
1169         if (enable == -1)
1170                 return;
1171
1172         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1173         set_osi_linux(enable);
1174
1175         return;
1176 }
1177
1178 /*
1179  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1180  *
1181  * empty string disables _OSI
1182  * string starting with '!' disables that string
1183  * otherwise string is added to list, augmenting built-in strings
1184  */
1185 static void __init acpi_osi_setup_late(void)
1186 {
1187         struct osi_setup_entry *osi;
1188         char *str;
1189         int i;
1190         acpi_status status;
1191
1192         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1193                 osi = &osi_setup_entries[i];
1194                 str = osi->string;
1195
1196                 if (*str == '\0')
1197                         break;
1198                 if (osi->enable) {
1199                         status = acpi_install_interface(str);
1200
1201                         if (ACPI_SUCCESS(status))
1202                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1203                 } else {
1204                         status = acpi_remove_interface(str);
1205
1206                         if (ACPI_SUCCESS(status))
1207                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1208                 }
1209         }
1210 }
1211
1212 static int __init osi_setup(char *str)
1213 {
1214         if (str && !strcmp("Linux", str))
1215                 acpi_cmdline_osi_linux(1);
1216         else if (str && !strcmp("!Linux", str))
1217                 acpi_cmdline_osi_linux(0);
1218         else
1219                 acpi_osi_setup(str);
1220
1221         return 1;
1222 }
1223
1224 __setup("acpi_osi=", osi_setup);
1225
1226 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1227 static int __init acpi_serialize_setup(char *str)
1228 {
1229         printk(KERN_INFO PREFIX "serialize enabled\n");
1230
1231         acpi_gbl_all_methods_serialized = TRUE;
1232
1233         return 1;
1234 }
1235
1236 __setup("acpi_serialize", acpi_serialize_setup);
1237
1238 /* Check of resource interference between native drivers and ACPI
1239  * OperationRegions (SystemIO and System Memory only).
1240  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1241  * in arbitrary AML code and can interfere with legacy drivers.
1242  * acpi_enforce_resources= can be set to:
1243  *
1244  *   - strict (default) (2)
1245  *     -> further driver trying to access the resources will not load
1246  *   - lax              (1)
1247  *     -> further driver trying to access the resources will load, but you
1248  *     get a system message that something might go wrong...
1249  *
1250  *   - no               (0)
1251  *     -> ACPI Operation Region resources will not be registered
1252  *
1253  */
1254 #define ENFORCE_RESOURCES_STRICT 2
1255 #define ENFORCE_RESOURCES_LAX    1
1256 #define ENFORCE_RESOURCES_NO     0
1257
1258 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1259
1260 static int __init acpi_enforce_resources_setup(char *str)
1261 {
1262         if (str == NULL || *str == '\0')
1263                 return 0;
1264
1265         if (!strcmp("strict", str))
1266                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1267         else if (!strcmp("lax", str))
1268                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1269         else if (!strcmp("no", str))
1270                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1271
1272         return 1;
1273 }
1274
1275 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1276
1277 /* Check for resource conflicts between ACPI OperationRegions and native
1278  * drivers */
1279 int acpi_check_resource_conflict(const struct resource *res)
1280 {
1281         struct acpi_res_list *res_list_elem;
1282         int ioport = 0, clash = 0;
1283
1284         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1285                 return 0;
1286         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1287                 return 0;
1288
1289         ioport = res->flags & IORESOURCE_IO;
1290
1291         spin_lock(&acpi_res_lock);
1292         list_for_each_entry(res_list_elem, &resource_list_head,
1293                             resource_list) {
1294                 if (ioport && (res_list_elem->resource_type
1295                                != ACPI_ADR_SPACE_SYSTEM_IO))
1296                         continue;
1297                 if (!ioport && (res_list_elem->resource_type
1298                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1299                         continue;
1300
1301                 if (res->end < res_list_elem->start
1302                     || res_list_elem->end < res->start)
1303                         continue;
1304                 clash = 1;
1305                 break;
1306         }
1307         spin_unlock(&acpi_res_lock);
1308
1309         if (clash) {
1310                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1311                         printk(KERN_WARNING "ACPI: resource %s %pR"
1312                                " conflicts with ACPI region %s "
1313                                "[%s 0x%zx-0x%zx]\n",
1314                                res->name, res, res_list_elem->name,
1315                                (res_list_elem->resource_type ==
1316                                 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1317                                (size_t) res_list_elem->start,
1318                                (size_t) res_list_elem->end);
1319                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1320                                 printk(KERN_NOTICE "ACPI: This conflict may"
1321                                        " cause random problems and system"
1322                                        " instability\n");
1323                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1324                                " for this device, you should use it instead of"
1325                                " the native driver\n");
1326                 }
1327                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1328                         return -EBUSY;
1329         }
1330         return 0;
1331 }
1332 EXPORT_SYMBOL(acpi_check_resource_conflict);
1333
1334 int acpi_check_region(resource_size_t start, resource_size_t n,
1335                       const char *name)
1336 {
1337         struct resource res = {
1338                 .start = start,
1339                 .end   = start + n - 1,
1340                 .name  = name,
1341                 .flags = IORESOURCE_IO,
1342         };
1343
1344         return acpi_check_resource_conflict(&res);
1345 }
1346 EXPORT_SYMBOL(acpi_check_region);
1347
1348 /*
1349  * Let drivers know whether the resource checks are effective
1350  */
1351 int acpi_resources_are_enforced(void)
1352 {
1353         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1354 }
1355 EXPORT_SYMBOL(acpi_resources_are_enforced);
1356
1357 /*
1358  * Deallocate the memory for a spinlock.
1359  */
1360 void acpi_os_delete_lock(acpi_spinlock handle)
1361 {
1362         ACPI_FREE(handle);
1363 }
1364
1365 /*
1366  * Acquire a spinlock.
1367  *
1368  * handle is a pointer to the spinlock_t.
1369  */
1370
1371 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1372 {
1373         acpi_cpu_flags flags;
1374         spin_lock_irqsave(lockp, flags);
1375         return flags;
1376 }
1377
1378 /*
1379  * Release a spinlock. See above.
1380  */
1381
1382 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1383 {
1384         spin_unlock_irqrestore(lockp, flags);
1385 }
1386
1387 #ifndef ACPI_USE_LOCAL_CACHE
1388
1389 /*******************************************************************************
1390  *
1391  * FUNCTION:    acpi_os_create_cache
1392  *
1393  * PARAMETERS:  name      - Ascii name for the cache
1394  *              size      - Size of each cached object
1395  *              depth     - Maximum depth of the cache (in objects) <ignored>
1396  *              cache     - Where the new cache object is returned
1397  *
1398  * RETURN:      status
1399  *
1400  * DESCRIPTION: Create a cache object
1401  *
1402  ******************************************************************************/
1403
1404 acpi_status
1405 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1406 {
1407         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1408         if (*cache == NULL)
1409                 return AE_ERROR;
1410         else
1411                 return AE_OK;
1412 }
1413
1414 /*******************************************************************************
1415  *
1416  * FUNCTION:    acpi_os_purge_cache
1417  *
1418  * PARAMETERS:  Cache           - Handle to cache object
1419  *
1420  * RETURN:      Status
1421  *
1422  * DESCRIPTION: Free all objects within the requested cache.
1423  *
1424  ******************************************************************************/
1425
1426 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1427 {
1428         kmem_cache_shrink(cache);
1429         return (AE_OK);
1430 }
1431
1432 /*******************************************************************************
1433  *
1434  * FUNCTION:    acpi_os_delete_cache
1435  *
1436  * PARAMETERS:  Cache           - Handle to cache object
1437  *
1438  * RETURN:      Status
1439  *
1440  * DESCRIPTION: Free all objects within the requested cache and delete the
1441  *              cache object.
1442  *
1443  ******************************************************************************/
1444
1445 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1446 {
1447         kmem_cache_destroy(cache);
1448         return (AE_OK);
1449 }
1450
1451 /*******************************************************************************
1452  *
1453  * FUNCTION:    acpi_os_release_object
1454  *
1455  * PARAMETERS:  Cache       - Handle to cache object
1456  *              Object      - The object to be released
1457  *
1458  * RETURN:      None
1459  *
1460  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1461  *              the object is deleted.
1462  *
1463  ******************************************************************************/
1464
1465 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1466 {
1467         kmem_cache_free(cache, object);
1468         return (AE_OK);
1469 }
1470
1471 static inline int acpi_res_list_add(struct acpi_res_list *res)
1472 {
1473         struct acpi_res_list *res_list_elem;
1474
1475         list_for_each_entry(res_list_elem, &resource_list_head,
1476                             resource_list) {
1477
1478                 if (res->resource_type == res_list_elem->resource_type &&
1479                     res->start == res_list_elem->start &&
1480                     res->end == res_list_elem->end) {
1481
1482                         /*
1483                          * The Region(addr,len) already exist in the list,
1484                          * just increase the count
1485                          */
1486
1487                         res_list_elem->count++;
1488                         return 0;
1489                 }
1490         }
1491
1492         res->count = 1;
1493         list_add(&res->resource_list, &resource_list_head);
1494         return 1;
1495 }
1496
1497 static inline void acpi_res_list_del(struct acpi_res_list *res)
1498 {
1499         struct acpi_res_list *res_list_elem;
1500
1501         list_for_each_entry(res_list_elem, &resource_list_head,
1502                             resource_list) {
1503
1504                 if (res->resource_type == res_list_elem->resource_type &&
1505                     res->start == res_list_elem->start &&
1506                     res->end == res_list_elem->end) {
1507
1508                         /*
1509                          * If the res count is decreased to 0,
1510                          * remove and free it
1511                          */
1512
1513                         if (--res_list_elem->count == 0) {
1514                                 list_del(&res_list_elem->resource_list);
1515                                 kfree(res_list_elem);
1516                         }
1517                         return;
1518                 }
1519         }
1520 }
1521
1522 acpi_status
1523 acpi_os_invalidate_address(
1524     u8                   space_id,
1525     acpi_physical_address   address,
1526     acpi_size               length)
1527 {
1528         struct acpi_res_list res;
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.start = address;
1536                 res.end = address + length - 1;
1537                 res.resource_type = space_id;
1538                 spin_lock(&acpi_res_lock);
1539                 acpi_res_list_del(&res);
1540                 spin_unlock(&acpi_res_lock);
1541                 break;
1542         case ACPI_ADR_SPACE_PCI_CONFIG:
1543         case ACPI_ADR_SPACE_EC:
1544         case ACPI_ADR_SPACE_SMBUS:
1545         case ACPI_ADR_SPACE_CMOS:
1546         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1547         case ACPI_ADR_SPACE_DATA_TABLE:
1548         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1549                 break;
1550         }
1551         return AE_OK;
1552 }
1553
1554 /******************************************************************************
1555  *
1556  * FUNCTION:    acpi_os_validate_address
1557  *
1558  * PARAMETERS:  space_id             - ACPI space ID
1559  *              address             - Physical address
1560  *              length              - Address length
1561  *
1562  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1563  *              should return AE_AML_ILLEGAL_ADDRESS.
1564  *
1565  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1566  *              the addresses accessed by AML operation regions.
1567  *
1568  *****************************************************************************/
1569
1570 acpi_status
1571 acpi_os_validate_address (
1572     u8                   space_id,
1573     acpi_physical_address   address,
1574     acpi_size               length,
1575     char *name)
1576 {
1577         struct acpi_res_list *res;
1578         int added;
1579         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1580                 return AE_OK;
1581
1582         switch (space_id) {
1583         case ACPI_ADR_SPACE_SYSTEM_IO:
1584         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1585                 /* Only interference checks against SystemIO and SystemMemory
1586                    are needed */
1587                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1588                 if (!res)
1589                         return AE_OK;
1590                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1591                 strlcpy(res->name, name, 5);
1592                 res->start = address;
1593                 res->end = address + length - 1;
1594                 res->resource_type = space_id;
1595                 spin_lock(&acpi_res_lock);
1596                 added = acpi_res_list_add(res);
1597                 spin_unlock(&acpi_res_lock);
1598                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1599                          "name: %s\n", added ? "Added" : "Already exist",
1600                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1601                          ? "SystemIO" : "System Memory",
1602                          (unsigned long long)res->start,
1603                          (unsigned long long)res->end,
1604                          res->name);
1605                 if (!added)
1606                         kfree(res);
1607                 break;
1608         case ACPI_ADR_SPACE_PCI_CONFIG:
1609         case ACPI_ADR_SPACE_EC:
1610         case ACPI_ADR_SPACE_SMBUS:
1611         case ACPI_ADR_SPACE_CMOS:
1612         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1613         case ACPI_ADR_SPACE_DATA_TABLE:
1614         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1615                 break;
1616         }
1617         return AE_OK;
1618 }
1619 #endif
1620
1621 acpi_status __init acpi_os_initialize(void)
1622 {
1623         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1624         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1625         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1626         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1627
1628         return AE_OK;
1629 }
1630
1631 acpi_status __init acpi_os_initialize1(void)
1632 {
1633         acpi_reserve_resources();
1634         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1635         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1636         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1637         BUG_ON(!kacpid_wq);
1638         BUG_ON(!kacpi_notify_wq);
1639         BUG_ON(!kacpi_hotplug_wq);
1640         acpi_install_interface_handler(acpi_osi_handler);
1641         acpi_osi_setup_late();
1642         return AE_OK;
1643 }
1644
1645 acpi_status acpi_os_terminate(void)
1646 {
1647         if (acpi_irq_handler) {
1648                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1649                                                  acpi_irq_handler);
1650         }
1651
1652         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1653         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1654         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1655         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1656
1657         destroy_workqueue(kacpid_wq);
1658         destroy_workqueue(kacpi_notify_wq);
1659         destroy_workqueue(kacpi_hotplug_wq);
1660
1661         return AE_OK;
1662 }