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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pci.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kmod.h>
  34 #include <linux/delay.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/nmi.h>
  37 #include <linux/acpi.h>
  38 #include <linux/efi.h>
  39 #include <linux/ioport.h>
  40 #include <linux/list.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/semaphore.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/io-64-nonatomic-lo-hi.h>
  47
  48 #include "internal.h"
  49
  50 #define _COMPONENT              ACPI_OS_SERVICES
  51 ACPI_MODULE_NAME("osl");
  52
  53 struct acpi_os_dpc {
  54         acpi_osd_exec_callback function;
  55         void *context;
  56         struct work_struct work;
  57 };
  58
  59 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  61 #endif
  62
  63 #ifdef ENABLE_DEBUGGER
  64 #include <linux/kdb.h>
  65
  66 /* stuff for debugger support */
  67 int acpi_in_debugger;
  68 EXPORT_SYMBOL(acpi_in_debugger);
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  72                                       u32 pm1b_ctrl);
  73 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  74                                       u32 val_b);
  75
  76 static acpi_osd_handler acpi_irq_handler;
  77 static void *acpi_irq_context;
  78 static struct workqueue_struct *kacpid_wq;
  79 static struct workqueue_struct *kacpi_notify_wq;
  80 static struct workqueue_struct *kacpi_hotplug_wq;
  81 static bool acpi_os_initialized;
  82 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  83
  84 /*
  85  * This list of permanent mappings is for memory that may be accessed from
  86  * interrupt context, where we can't do the ioremap().
  87  */
  88 struct acpi_ioremap {
  89         struct list_head list;
  90         void __iomem *virt;
  91         acpi_physical_address phys;
  92         acpi_size size;
  93         unsigned long refcount;
  94 };
  95
  96 static LIST_HEAD(acpi_ioremaps);
  97 static DEFINE_MUTEX(acpi_ioremap_lock);
  98
  99 static void __init acpi_osi_setup_late(void);
 100
 101 /*
 102  * The story of _OSI(Linux)
 103  *
 104  * From pre-history through Linux-2.6.22,
 105  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 106  *
 107  * Unfortunately, reference BIOS writers got wind of this
 108  * and put OSI(Linux) in their example code, quickly exposing
 109  * this string as ill-conceived and opening the door to
 110  * an un-bounded number of BIOS incompatibilities.
 111  *
 112  * For example, OSI(Linux) was used on resume to re-POST a
 113  * video card on one system, because Linux at that time
 114  * could not do a speedy restore in its native driver.
 115  * But then upon gaining quick native restore capability,
 116  * Linux has no way to tell the BIOS to skip the time-consuming
 117  * POST -- putting Linux at a permanent performance disadvantage.
 118  * On another system, the BIOS writer used OSI(Linux)
 119  * to infer native OS support for IPMI!  On other systems,
 120  * OSI(Linux) simply got in the way of Linux claiming to
 121  * be compatible with other operating systems, exposing
 122  * BIOS issues such as skipped device initialization.
 123  *
 124  * So "Linux" turned out to be a really poor chose of
 125  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 126  *
 127  * BIOS writers should NOT query _OSI(Linux) on future systems.
 128  * Linux will complain on the console when it sees it, and return FALSE.
 129  * To get Linux to return TRUE for your system  will require
 130  * a kernel source update to add a DMI entry,
 131  * or boot with "acpi_osi=Linux"
 132  */
 133
 134 static struct osi_linux {
 135         unsigned int    enable:1;
 136         unsigned int    dmi:1;
 137         unsigned int    cmdline:1;
 138         unsigned int    default_disabling:1;
 139 } osi_linux = {0, 0, 0, 0};
 140
 141 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 142 {
 143         if (!strcmp("Linux", interface)) {
 144
 145                 printk_once(KERN_NOTICE FW_BUG PREFIX
 146                         "BIOS _OSI(Linux) query %s%s\n",
 147                         osi_linux.enable ? "honored" : "ignored",
 148                         osi_linux.cmdline ? " via cmdline" :
 149                         osi_linux.dmi ? " via DMI" : "");
 150         }
 151
 152         if (!strcmp("Darwin", interface)) {
 153                 /*
 154                  * Apple firmware will behave poorly if it receives positive
 155                  * answers to "Darwin" and any other OS. Respond positively
 156                  * to Darwin and then disable all other vendor strings.
 157                  */
 158                 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
 159                 supported = ACPI_UINT32_MAX;
 160         }
 161
 162         return supported;
 163 }
 164
 165 static void __init acpi_request_region (struct acpi_generic_address *gas,
 166         unsigned int length, char *desc)
 167 {
 168         u64 addr;
 169
 170         /* Handle possible alignment issues */
 171         memcpy(&addr, &gas->address, sizeof(addr));
 172         if (!addr || !length)
 173                 return;
 174
 175         /* Resources are never freed */
 176         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 177                 request_region(addr, length, desc);
 178         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 179                 request_mem_region(addr, length, desc);
 180 }
 181
 182 static int __init acpi_reserve_resources(void)
 183 {
 184         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 185                 "ACPI PM1a_EVT_BLK");
 186
 187         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 188                 "ACPI PM1b_EVT_BLK");
 189
 190         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 191                 "ACPI PM1a_CNT_BLK");
 192
 193         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 194                 "ACPI PM1b_CNT_BLK");
 195
 196         if (acpi_gbl_FADT.pm_timer_length == 4)
 197                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 198
 199         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 200                 "ACPI PM2_CNT_BLK");
 201
 202         /* Length of GPE blocks must be a non-negative multiple of 2 */
 203
 204         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 205                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 206                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 207
 208         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 209                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 210                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 211
 212         return 0;
 213 }
 214 fs_initcall_sync(acpi_reserve_resources);
 215
 216 void acpi_os_printf(const char *fmt, ...)
 217 {
 218         va_list args;
 219         va_start(args, fmt);
 220         acpi_os_vprintf(fmt, args);
 221         va_end(args);
 222 }
 223 EXPORT_SYMBOL(acpi_os_printf);
 224
 225 void acpi_os_vprintf(const char *fmt, va_list args)
 226 {
 227         static char buffer[512];
 228
 229         vsprintf(buffer, fmt, args);
 230
 231 #ifdef ENABLE_DEBUGGER
 232         if (acpi_in_debugger) {
 233                 kdb_printf("%s", buffer);
 234         } else {
 235                 printk(KERN_CONT "%s", buffer);
 236         }
 237 #else
 238         if (acpi_debugger_write_log(buffer) < 0)
 239                 printk(KERN_CONT "%s", buffer);
 240 #endif
 241 }
 242
 243 #ifdef CONFIG_KEXEC
 244 static unsigned long acpi_rsdp;
 245 static int __init setup_acpi_rsdp(char *arg)
 246 {
 247         if (kstrtoul(arg, 16, &acpi_rsdp))
 248                 return -EINVAL;
 249         return 0;
 250 }
 251 early_param("acpi_rsdp", setup_acpi_rsdp);
 252 #endif
 253
 254 acpi_physical_address __init acpi_os_get_root_pointer(void)
 255 {
 256 #ifdef CONFIG_KEXEC
 257         if (acpi_rsdp)
 258                 return acpi_rsdp;
 259 #endif
 260
 261         if (efi_enabled(EFI_CONFIG_TABLES)) {
 262                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 263                         return efi.acpi20;
 264                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 265                         return efi.acpi;
 266                 else {
 267                         printk(KERN_ERR PREFIX
 268                                "System description tables not found\n");
 269                         return 0;
 270                 }
 271         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 272                 acpi_physical_address pa = 0;
 273
 274                 acpi_find_root_pointer(&pa);
 275                 return pa;
 276         }
 277
 278         return 0;
 279 }
 280
 281 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 282 static struct acpi_ioremap *
 283 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 284 {
 285         struct acpi_ioremap *map;
 286
 287         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 288                 if (map->phys <= phys &&
 289                     phys + size <= map->phys + map->size)
 290                         return map;
 291
 292         return NULL;
 293 }
 294
 295 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 296 static void __iomem *
 297 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 298 {
 299         struct acpi_ioremap *map;
 300
 301         map = acpi_map_lookup(phys, size);
 302         if (map)
 303                 return map->virt + (phys - map->phys);
 304
 305         return NULL;
 306 }
 307
 308 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 309 {
 310         struct acpi_ioremap *map;
 311         void __iomem *virt = NULL;
 312
 313         mutex_lock(&acpi_ioremap_lock);
 314         map = acpi_map_lookup(phys, size);
 315         if (map) {
 316                 virt = map->virt + (phys - map->phys);
 317                 map->refcount++;
 318         }
 319         mutex_unlock(&acpi_ioremap_lock);
 320         return virt;
 321 }
 322 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 323
 324 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 325 static struct acpi_ioremap *
 326 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 327 {
 328         struct acpi_ioremap *map;
 329
 330         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 331                 if (map->virt <= virt &&
 332                     virt + size <= map->virt + map->size)
 333                         return map;
 334
 335         return NULL;
 336 }
 337
 338 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 339 /* ioremap will take care of cache attributes */
 340 #define should_use_kmap(pfn)   0
 341 #else
 342 #define should_use_kmap(pfn)   page_is_ram(pfn)
 343 #endif
 344
 345 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 346 {
 347         unsigned long pfn;
 348
 349         pfn = pg_off >> PAGE_SHIFT;
 350         if (should_use_kmap(pfn)) {
 351                 if (pg_sz > PAGE_SIZE)
 352                         return NULL;
 353                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 354         } else
 355                 return acpi_os_ioremap(pg_off, pg_sz);
 356 }
 357
 358 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 359 {
 360         unsigned long pfn;
 361
 362         pfn = pg_off >> PAGE_SHIFT;
 363         if (should_use_kmap(pfn))
 364                 kunmap(pfn_to_page(pfn));
 365         else
 366                 iounmap(vaddr);
 367 }
 368
 369 /**
 370  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 371  * @phys: Start of the physical address range to map.
 372  * @size: Size of the physical address range to map.
 373  *
 374  * Look up the given physical address range in the list of existing ACPI memory
 375  * mappings.  If found, get a reference to it and return a pointer to it (its
 376  * virtual address).  If not found, map it, add it to that list and return a
 377  * pointer to it.
 378  *
 379  * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
 380  * routine simply calls __acpi_map_table() to get the job done.
 381  */
 382 void __iomem *__init_refok
 383 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 384 {
 385         struct acpi_ioremap *map;
 386         void __iomem *virt;
 387         acpi_physical_address pg_off;
 388         acpi_size pg_sz;
 389
 390         if (phys > ULONG_MAX) {
 391                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 392                 return NULL;
 393         }
 394
 395         if (!acpi_gbl_permanent_mmap)
 396                 return __acpi_map_table((unsigned long)phys, size);
 397
 398         mutex_lock(&acpi_ioremap_lock);
 399         /* Check if there's a suitable mapping already. */
 400         map = acpi_map_lookup(phys, size);
 401         if (map) {
 402                 map->refcount++;
 403                 goto out;
 404         }
 405
 406         map = kzalloc(sizeof(*map), GFP_KERNEL);
 407         if (!map) {
 408                 mutex_unlock(&acpi_ioremap_lock);
 409                 return NULL;
 410         }
 411
 412         pg_off = round_down(phys, PAGE_SIZE);
 413         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 414         virt = acpi_map(pg_off, pg_sz);
 415         if (!virt) {
 416                 mutex_unlock(&acpi_ioremap_lock);
 417                 kfree(map);
 418                 return NULL;
 419         }
 420
 421         INIT_LIST_HEAD(&map->list);
 422         map->virt = virt;
 423         map->phys = pg_off;
 424         map->size = pg_sz;
 425         map->refcount = 1;
 426
 427         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 428
 429 out:
 430         mutex_unlock(&acpi_ioremap_lock);
 431         return map->virt + (phys - map->phys);
 432 }
 433 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 434
 435 void *__init_refok
 436 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 437 {
 438         return (void *)acpi_os_map_iomem(phys, size);
 439 }
 440 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 441
 442 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 443 {
 444         if (!--map->refcount)
 445                 list_del_rcu(&map->list);
 446 }
 447
 448 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 449 {
 450         if (!map->refcount) {
 451                 synchronize_rcu_expedited();
 452                 acpi_unmap(map->phys, map->virt);
 453                 kfree(map);
 454         }
 455 }
 456
 457 /**
 458  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 459  * @virt: Start of the address range to drop a reference to.
 460  * @size: Size of the address range to drop a reference to.
 461  *
 462  * Look up the given virtual address range in the list of existing ACPI memory
 463  * mappings, drop a reference to it and unmap it if there are no more active
 464  * references to it.
 465  *
 466  * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
 467  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 468  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 469  * here.
 470  */
 471 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 472 {
 473         struct acpi_ioremap *map;
 474
 475         if (!acpi_gbl_permanent_mmap) {
 476                 __acpi_unmap_table(virt, size);
 477                 return;
 478         }
 479
 480         mutex_lock(&acpi_ioremap_lock);
 481         map = acpi_map_lookup_virt(virt, size);
 482         if (!map) {
 483                 mutex_unlock(&acpi_ioremap_lock);
 484                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 485                 return;
 486         }
 487         acpi_os_drop_map_ref(map);
 488         mutex_unlock(&acpi_ioremap_lock);
 489
 490         acpi_os_map_cleanup(map);
 491 }
 492 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 493
 494 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 495 {
 496         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 497 }
 498 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 499
 500 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 501 {
 502         if (!acpi_gbl_permanent_mmap)
 503                 __acpi_unmap_table(virt, size);
 504 }
 505
 506 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 507 {
 508         u64 addr;
 509         void __iomem *virt;
 510
 511         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 512                 return 0;
 513
 514         /* Handle possible alignment issues */
 515         memcpy(&addr, &gas->address, sizeof(addr));
 516         if (!addr || !gas->bit_width)
 517                 return -EINVAL;
 518
 519         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 520         if (!virt)
 521                 return -EIO;
 522
 523         return 0;
 524 }
 525 EXPORT_SYMBOL(acpi_os_map_generic_address);
 526
 527 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 528 {
 529         u64 addr;
 530         struct acpi_ioremap *map;
 531
 532         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 533                 return;
 534
 535         /* Handle possible alignment issues */
 536         memcpy(&addr, &gas->address, sizeof(addr));
 537         if (!addr || !gas->bit_width)
 538                 return;
 539
 540         mutex_lock(&acpi_ioremap_lock);
 541         map = acpi_map_lookup(addr, gas->bit_width / 8);
 542         if (!map) {
 543                 mutex_unlock(&acpi_ioremap_lock);
 544                 return;
 545         }
 546         acpi_os_drop_map_ref(map);
 547         mutex_unlock(&acpi_ioremap_lock);
 548
 549         acpi_os_map_cleanup(map);
 550 }
 551 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 552
 553 #ifdef ACPI_FUTURE_USAGE
 554 acpi_status
 555 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 556 {
 557         if (!phys || !virt)
 558                 return AE_BAD_PARAMETER;
 559
 560         *phys = virt_to_phys(virt);
 561
 562         return AE_OK;
 563 }
 564 #endif
 565
 566 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 567 static bool acpi_rev_override;
 568
 569 int __init acpi_rev_override_setup(char *str)
 570 {
 571         acpi_rev_override = true;
 572         return 1;
 573 }
 574 __setup("acpi_rev_override", acpi_rev_override_setup);
 575 #else
 576 #define acpi_rev_override       false
 577 #endif
 578
 579 #define ACPI_MAX_OVERRIDE_LEN 100
 580
 581 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 582
 583 acpi_status
 584 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 585                             char **new_val)
 586 {
 587         if (!init_val || !new_val)
 588                 return AE_BAD_PARAMETER;
 589
 590         *new_val = NULL;
 591         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 592                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 593                        acpi_os_name);
 594                 *new_val = acpi_os_name;
 595         }
 596
 597         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 598                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 599                 *new_val = (char *)5;
 600         }
 601
 602         return AE_OK;
 603 }
 604
 605 static void acpi_table_taint(struct acpi_table_header *table)
 606 {
 607         pr_warn(PREFIX
 608                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 609                 table->signature, table->oem_table_id);
 610         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 611 }
 612
 613 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 614 #include <linux/earlycpio.h>
 615 #include <linux/memblock.h>
 616
 617 static u64 acpi_tables_addr;
 618 static int all_tables_size;
 619
 620 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 621 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 622 {
 623         u8 sum = 0;
 624         u8 *end = buffer + length;
 625
 626         while (buffer < end)
 627                 sum = (u8) (sum + *(buffer++));
 628         return sum;
 629 }
 630
 631 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 632 static const char * const table_sigs[] = {
 633         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 634         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 635         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 636         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 637         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 638         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 639         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 640         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 641         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 642
 643 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 644
 645 #define ACPI_OVERRIDE_TABLES 64
 646 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 647 static DECLARE_BITMAP(acpi_initrd_installed, ACPI_OVERRIDE_TABLES);
 648
 649 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 650
 651 void __init acpi_initrd_override(void *data, size_t size)
 652 {
 653         int sig, no, table_nr = 0, total_offset = 0;
 654         long offset = 0;
 655         struct acpi_table_header *table;
 656         char cpio_path[32] = "kernel/firmware/acpi/";
 657         struct cpio_data file;
 658
 659         if (data == NULL || size == 0)
 660                 return;
 661
 662         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 663                 file = find_cpio_data(cpio_path, data, size, &offset);
 664                 if (!file.data)
 665                         break;
 666
 667                 data += offset;
 668                 size -= offset;
 669
 670                 if (file.size < sizeof(struct acpi_table_header)) {
 671                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 672                                 cpio_path, file.name);
 673                         continue;
 674                 }
 675
 676                 table = file.data;
 677
 678                 for (sig = 0; table_sigs[sig]; sig++)
 679                         if (!memcmp(table->signature, table_sigs[sig], 4))
 680                                 break;
 681
 682                 if (!table_sigs[sig]) {
 683                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 684                                 cpio_path, file.name);
 685                         continue;
 686                 }
 687                 if (file.size != table->length) {
 688                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 689                                 cpio_path, file.name);
 690                         continue;
 691                 }
 692                 if (acpi_table_checksum(file.data, table->length)) {
 693                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 694                                 cpio_path, file.name);
 695                         continue;
 696                 }
 697
 698                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 699                         table->signature, cpio_path, file.name, table->length);
 700
 701                 all_tables_size += table->length;
 702                 acpi_initrd_files[table_nr].data = file.data;
 703                 acpi_initrd_files[table_nr].size = file.size;
 704                 table_nr++;
 705         }
 706         if (table_nr == 0)
 707                 return;
 708
 709         acpi_tables_addr =
 710                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 711                                        all_tables_size, PAGE_SIZE);
 712         if (!acpi_tables_addr) {
 713                 WARN_ON(1);
 714                 return;
 715         }
 716         /*
 717          * Only calling e820_add_reserve does not work and the
 718          * tables are invalid (memory got used) later.
 719          * memblock_reserve works as expected and the tables won't get modified.
 720          * But it's not enough on X86 because ioremap will
 721          * complain later (used by acpi_os_map_memory) that the pages
 722          * that should get mapped are not marked "reserved".
 723          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 724          * works fine.
 725          */
 726         memblock_reserve(acpi_tables_addr, all_tables_size);
 727         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 728
 729         /*
 730          * early_ioremap only can remap 256k one time. If we map all
 731          * tables one time, we will hit the limit. Need to map chunks
 732          * one by one during copying the same as that in relocate_initrd().
 733          */
 734         for (no = 0; no < table_nr; no++) {
 735                 unsigned char *src_p = acpi_initrd_files[no].data;
 736                 phys_addr_t size = acpi_initrd_files[no].size;
 737                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 738                 phys_addr_t slop, clen;
 739                 char *dest_p;
 740
 741                 total_offset += size;
 742
 743                 while (size) {
 744                         slop = dest_addr & ~PAGE_MASK;
 745                         clen = size;
 746                         if (clen > MAP_CHUNK_SIZE - slop)
 747                                 clen = MAP_CHUNK_SIZE - slop;
 748                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 749                                                  clen + slop);
 750                         memcpy(dest_p + slop, src_p, clen);
 751                         early_iounmap(dest_p, clen + slop);
 752                         src_p += clen;
 753                         dest_addr += clen;
 754                         size -= clen;
 755                 }
 756         }
 757 }
 758
 759 acpi_status
 760 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 761                                 acpi_physical_address *address, u32 *length)
 762 {
 763         int table_offset = 0;
 764         int table_index = 0;
 765         struct acpi_table_header *table;
 766         u32 table_length;
 767
 768         *length = 0;
 769         *address = 0;
 770         if (!acpi_tables_addr)
 771                 return AE_OK;
 772
 773         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 774                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 775                                            ACPI_HEADER_SIZE);
 776                 if (table_offset + table->length > all_tables_size) {
 777                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 778                         WARN_ON(1);
 779                         return AE_OK;
 780                 }
 781
 782                 table_length = table->length;
 783
 784                 /* Only override tables matched */
 785                 if (test_bit(table_index, acpi_initrd_installed) ||
 786                     memcmp(existing_table->signature, table->signature, 4) ||
 787                     memcmp(table->oem_table_id, existing_table->oem_table_id,
 788                            ACPI_OEM_TABLE_ID_SIZE)) {
 789                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 790                         goto next_table;
 791                 }
 792
 793                 *length = table_length;
 794                 *address = acpi_tables_addr + table_offset;
 795                 acpi_table_taint(existing_table);
 796                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 797                 set_bit(table_index, acpi_initrd_installed);
 798                 break;
 799
 800 next_table:
 801                 table_offset += table_length;
 802                 table_index++;
 803         }
 804         return AE_OK;
 805 }
 806
 807 void __init acpi_initrd_initialize_tables(void)
 808 {
 809         int table_offset = 0;
 810         int table_index = 0;
 811         u32 table_length;
 812         struct acpi_table_header *table;
 813
 814         if (!acpi_tables_addr)
 815                 return;
 816
 817         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 818                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 819                                            ACPI_HEADER_SIZE);
 820                 if (table_offset + table->length > all_tables_size) {
 821                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 822                         WARN_ON(1);
 823                         return;
 824                 }
 825
 826                 table_length = table->length;
 827
 828                 /* Skip RSDT/XSDT which should only be used for override */
 829                 if (test_bit(table_index, acpi_initrd_installed) ||
 830                     ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
 831                     ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
 832                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 833                         goto next_table;
 834                 }
 835
 836                 acpi_table_taint(table);
 837                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 838                 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
 839                 set_bit(table_index, acpi_initrd_installed);
 840 next_table:
 841                 table_offset += table_length;
 842                 table_index++;
 843         }
 844 }
 845 #else
 846 acpi_status
 847 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 848                                 acpi_physical_address *address,
 849                                 u32 *table_length)
 850 {
 851         *table_length = 0;
 852         *address = 0;
 853         return AE_OK;
 854 }
 855
 856 void __init acpi_initrd_initialize_tables(void)
 857 {
 858 }
 859 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 860
 861 acpi_status
 862 acpi_os_table_override(struct acpi_table_header *existing_table,
 863                        struct acpi_table_header **new_table)
 864 {
 865         if (!existing_table || !new_table)
 866                 return AE_BAD_PARAMETER;
 867
 868         *new_table = NULL;
 869
 870 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 871         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 872                 *new_table = (struct acpi_table_header *)AmlCode;
 873 #endif
 874         if (*new_table != NULL)
 875                 acpi_table_taint(existing_table);
 876         return AE_OK;
 877 }
 878
 879 static irqreturn_t acpi_irq(int irq, void *dev_id)
 880 {
 881         u32 handled;
 882
 883         handled = (*acpi_irq_handler) (acpi_irq_context);
 884
 885         if (handled) {
 886                 acpi_irq_handled++;
 887                 return IRQ_HANDLED;
 888         } else {
 889                 acpi_irq_not_handled++;
 890                 return IRQ_NONE;
 891         }
 892 }
 893
 894 acpi_status
 895 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 896                                   void *context)
 897 {
 898         unsigned int irq;
 899
 900         acpi_irq_stats_init();
 901
 902         /*
 903          * ACPI interrupts different from the SCI in our copy of the FADT are
 904          * not supported.
 905          */
 906         if (gsi != acpi_gbl_FADT.sci_interrupt)
 907                 return AE_BAD_PARAMETER;
 908
 909         if (acpi_irq_handler)
 910                 return AE_ALREADY_ACQUIRED;
 911
 912         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 913                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 914                        gsi);
 915                 return AE_OK;
 916         }
 917
 918         acpi_irq_handler = handler;
 919         acpi_irq_context = context;
 920         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 921                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 922                 acpi_irq_handler = NULL;
 923                 return AE_NOT_ACQUIRED;
 924         }
 925         acpi_sci_irq = irq;
 926
 927         return AE_OK;
 928 }
 929
 930 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 931 {
 932         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 933                 return AE_BAD_PARAMETER;
 934
 935         free_irq(acpi_sci_irq, acpi_irq);
 936         acpi_irq_handler = NULL;
 937         acpi_sci_irq = INVALID_ACPI_IRQ;
 938
 939         return AE_OK;
 940 }
 941
 942 /*
 943  * Running in interpreter thread context, safe to sleep
 944  */
 945
 946 void acpi_os_sleep(u64 ms)
 947 {
 948         msleep(ms);
 949 }
 950
 951 void acpi_os_stall(u32 us)
 952 {
 953         while (us) {
 954                 u32 delay = 1000;
 955
 956                 if (delay > us)
 957                         delay = us;
 958                 udelay(delay);
 959                 touch_nmi_watchdog();
 960                 us -= delay;
 961         }
 962 }
 963
 964 /*
 965  * Support ACPI 3.0 AML Timer operand
 966  * Returns 64-bit free-running, monotonically increasing timer
 967  * with 100ns granularity
 968  */
 969 u64 acpi_os_get_timer(void)
 970 {
 971         u64 time_ns = ktime_to_ns(ktime_get());
 972         do_div(time_ns, 100);
 973         return time_ns;
 974 }
 975
 976 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 977 {
 978         u32 dummy;
 979
 980         if (!value)
 981                 value = &dummy;
 982
 983         *value = 0;
 984         if (width <= 8) {
 985                 *(u8 *) value = inb(port);
 986         } else if (width <= 16) {
 987                 *(u16 *) value = inw(port);
 988         } else if (width <= 32) {
 989                 *(u32 *) value = inl(port);
 990         } else {
 991                 BUG();
 992         }
 993
 994         return AE_OK;
 995 }
 996
 997 EXPORT_SYMBOL(acpi_os_read_port);
 998
 999 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
1000 {
1001         if (width <= 8) {
1002                 outb(value, port);
1003         } else if (width <= 16) {
1004                 outw(value, port);
1005         } else if (width <= 32) {
1006                 outl(value, port);
1007         } else {
1008                 BUG();
1009         }
1010
1011         return AE_OK;
1012 }
1013
1014 EXPORT_SYMBOL(acpi_os_write_port);
1015
1016 acpi_status
1017 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
1018 {
1019         void __iomem *virt_addr;
1020         unsigned int size = width / 8;
1021         bool unmap = false;
1022         u64 dummy;
1023
1024         rcu_read_lock();
1025         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1026         if (!virt_addr) {
1027                 rcu_read_unlock();
1028                 virt_addr = acpi_os_ioremap(phys_addr, size);
1029                 if (!virt_addr)
1030                         return AE_BAD_ADDRESS;
1031                 unmap = true;
1032         }
1033
1034         if (!value)
1035                 value = &dummy;
1036
1037         switch (width) {
1038         case 8:
1039                 *(u8 *) value = readb(virt_addr);
1040                 break;
1041         case 16:
1042                 *(u16 *) value = readw(virt_addr);
1043                 break;
1044         case 32:
1045                 *(u32 *) value = readl(virt_addr);
1046                 break;
1047         case 64:
1048                 *(u64 *) value = readq(virt_addr);
1049                 break;
1050         default:
1051                 BUG();
1052         }
1053
1054         if (unmap)
1055                 iounmap(virt_addr);
1056         else
1057                 rcu_read_unlock();
1058
1059         return AE_OK;
1060 }
1061
1062 acpi_status
1063 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1064 {
1065         void __iomem *virt_addr;
1066         unsigned int size = width / 8;
1067         bool unmap = false;
1068
1069         rcu_read_lock();
1070         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1071         if (!virt_addr) {
1072                 rcu_read_unlock();
1073                 virt_addr = acpi_os_ioremap(phys_addr, size);
1074                 if (!virt_addr)
1075                         return AE_BAD_ADDRESS;
1076                 unmap = true;
1077         }
1078
1079         switch (width) {
1080         case 8:
1081                 writeb(value, virt_addr);
1082                 break;
1083         case 16:
1084                 writew(value, virt_addr);
1085                 break;
1086         case 32:
1087                 writel(value, virt_addr);
1088                 break;
1089         case 64:
1090                 writeq(value, virt_addr);
1091                 break;
1092         default:
1093                 BUG();
1094         }
1095
1096         if (unmap)
1097                 iounmap(virt_addr);
1098         else
1099                 rcu_read_unlock();
1100
1101         return AE_OK;
1102 }
1103
1104 acpi_status
1105 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1106                                u64 *value, u32 width)
1107 {
1108         int result, size;
1109         u32 value32;
1110
1111         if (!value)
1112                 return AE_BAD_PARAMETER;
1113
1114         switch (width) {
1115         case 8:
1116                 size = 1;
1117                 break;
1118         case 16:
1119                 size = 2;
1120                 break;
1121         case 32:
1122                 size = 4;
1123                 break;
1124         default:
1125                 return AE_ERROR;
1126         }
1127
1128         result = raw_pci_read(pci_id->segment, pci_id->bus,
1129                                 PCI_DEVFN(pci_id->device, pci_id->function),
1130                                 reg, size, &value32);
1131         *value = value32;
1132
1133         return (result ? AE_ERROR : AE_OK);
1134 }
1135
1136 acpi_status
1137 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1138                                 u64 value, u32 width)
1139 {
1140         int result, size;
1141
1142         switch (width) {
1143         case 8:
1144                 size = 1;
1145                 break;
1146         case 16:
1147                 size = 2;
1148                 break;
1149         case 32:
1150                 size = 4;
1151                 break;
1152         default:
1153                 return AE_ERROR;
1154         }
1155
1156         result = raw_pci_write(pci_id->segment, pci_id->bus,
1157                                 PCI_DEVFN(pci_id->device, pci_id->function),
1158                                 reg, size, value);
1159
1160         return (result ? AE_ERROR : AE_OK);
1161 }
1162
1163 static void acpi_os_execute_deferred(struct work_struct *work)
1164 {
1165         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1166
1167         dpc->function(dpc->context);
1168         kfree(dpc);
1169 }
1170
1171 #ifdef CONFIG_ACPI_DEBUGGER
1172 static struct acpi_debugger acpi_debugger;
1173 static bool acpi_debugger_initialized;
1174
1175 int acpi_register_debugger(struct module *owner,
1176                            const struct acpi_debugger_ops *ops)
1177 {
1178         int ret = 0;
1179
1180         mutex_lock(&acpi_debugger.lock);
1181         if (acpi_debugger.ops) {
1182                 ret = -EBUSY;
1183                 goto err_lock;
1184         }
1185
1186         acpi_debugger.owner = owner;
1187         acpi_debugger.ops = ops;
1188
1189 err_lock:
1190         mutex_unlock(&acpi_debugger.lock);
1191         return ret;
1192 }
1193 EXPORT_SYMBOL(acpi_register_debugger);
1194
1195 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
1196 {
1197         mutex_lock(&acpi_debugger.lock);
1198         if (ops == acpi_debugger.ops) {
1199                 acpi_debugger.ops = NULL;
1200                 acpi_debugger.owner = NULL;
1201         }
1202         mutex_unlock(&acpi_debugger.lock);
1203 }
1204 EXPORT_SYMBOL(acpi_unregister_debugger);
1205
1206 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
1207 {
1208         int ret;
1209         int (*func)(acpi_osd_exec_callback, void *);
1210         struct module *owner;
1211
1212         if (!acpi_debugger_initialized)
1213                 return -ENODEV;
1214         mutex_lock(&acpi_debugger.lock);
1215         if (!acpi_debugger.ops) {
1216                 ret = -ENODEV;
1217                 goto err_lock;
1218         }
1219         if (!try_module_get(acpi_debugger.owner)) {
1220                 ret = -ENODEV;
1221                 goto err_lock;
1222         }
1223         func = acpi_debugger.ops->create_thread;
1224         owner = acpi_debugger.owner;
1225         mutex_unlock(&acpi_debugger.lock);
1226
1227         ret = func(function, context);
1228
1229         mutex_lock(&acpi_debugger.lock);
1230         module_put(owner);
1231 err_lock:
1232         mutex_unlock(&acpi_debugger.lock);
1233         return ret;
1234 }
1235
1236 ssize_t acpi_debugger_write_log(const char *msg)
1237 {
1238         ssize_t ret;
1239         ssize_t (*func)(const char *);
1240         struct module *owner;
1241
1242         if (!acpi_debugger_initialized)
1243                 return -ENODEV;
1244         mutex_lock(&acpi_debugger.lock);
1245         if (!acpi_debugger.ops) {
1246                 ret = -ENODEV;
1247                 goto err_lock;
1248         }
1249         if (!try_module_get(acpi_debugger.owner)) {
1250                 ret = -ENODEV;
1251                 goto err_lock;
1252         }
1253         func = acpi_debugger.ops->write_log;
1254         owner = acpi_debugger.owner;
1255         mutex_unlock(&acpi_debugger.lock);
1256
1257         ret = func(msg);
1258
1259         mutex_lock(&acpi_debugger.lock);
1260         module_put(owner);
1261 err_lock:
1262         mutex_unlock(&acpi_debugger.lock);
1263         return ret;
1264 }
1265
1266 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
1267 {
1268         ssize_t ret;
1269         ssize_t (*func)(char *, size_t);
1270         struct module *owner;
1271
1272         if (!acpi_debugger_initialized)
1273                 return -ENODEV;
1274         mutex_lock(&acpi_debugger.lock);
1275         if (!acpi_debugger.ops) {
1276                 ret = -ENODEV;
1277                 goto err_lock;
1278         }
1279         if (!try_module_get(acpi_debugger.owner)) {
1280                 ret = -ENODEV;
1281                 goto err_lock;
1282         }
1283         func = acpi_debugger.ops->read_cmd;
1284         owner = acpi_debugger.owner;
1285         mutex_unlock(&acpi_debugger.lock);
1286
1287         ret = func(buffer, buffer_length);
1288
1289         mutex_lock(&acpi_debugger.lock);
1290         module_put(owner);
1291 err_lock:
1292         mutex_unlock(&acpi_debugger.lock);
1293         return ret;
1294 }
1295
1296 int acpi_debugger_wait_command_ready(void)
1297 {
1298         int ret;
1299         int (*func)(bool, char *, size_t);
1300         struct module *owner;
1301
1302         if (!acpi_debugger_initialized)
1303                 return -ENODEV;
1304         mutex_lock(&acpi_debugger.lock);
1305         if (!acpi_debugger.ops) {
1306                 ret = -ENODEV;
1307                 goto err_lock;
1308         }
1309         if (!try_module_get(acpi_debugger.owner)) {
1310                 ret = -ENODEV;
1311                 goto err_lock;
1312         }
1313         func = acpi_debugger.ops->wait_command_ready;
1314         owner = acpi_debugger.owner;
1315         mutex_unlock(&acpi_debugger.lock);
1316
1317         ret = func(acpi_gbl_method_executing,
1318                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1319
1320         mutex_lock(&acpi_debugger.lock);
1321         module_put(owner);
1322 err_lock:
1323         mutex_unlock(&acpi_debugger.lock);
1324         return ret;
1325 }
1326
1327 int acpi_debugger_notify_command_complete(void)
1328 {
1329         int ret;
1330         int (*func)(void);
1331         struct module *owner;
1332
1333         if (!acpi_debugger_initialized)
1334                 return -ENODEV;
1335         mutex_lock(&acpi_debugger.lock);
1336         if (!acpi_debugger.ops) {
1337                 ret = -ENODEV;
1338                 goto err_lock;
1339         }
1340         if (!try_module_get(acpi_debugger.owner)) {
1341                 ret = -ENODEV;
1342                 goto err_lock;
1343         }
1344         func = acpi_debugger.ops->notify_command_complete;
1345         owner = acpi_debugger.owner;
1346         mutex_unlock(&acpi_debugger.lock);
1347
1348         ret = func();
1349
1350         mutex_lock(&acpi_debugger.lock);
1351         module_put(owner);
1352 err_lock:
1353         mutex_unlock(&acpi_debugger.lock);
1354         return ret;
1355 }
1356
1357 int __init acpi_debugger_init(void)
1358 {
1359         mutex_init(&acpi_debugger.lock);
1360         acpi_debugger_initialized = true;
1361         return 0;
1362 }
1363 #endif
1364
1365 /*******************************************************************************
1366  *
1367  * FUNCTION:    acpi_os_execute
1368  *
1369  * PARAMETERS:  Type               - Type of the callback
1370  *              Function           - Function to be executed
1371  *              Context            - Function parameters
1372  *
1373  * RETURN:      Status
1374  *
1375  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1376  *              immediately executes function on a separate thread.
1377  *
1378  ******************************************************************************/
1379
1380 acpi_status acpi_os_execute(acpi_execute_type type,
1381                             acpi_osd_exec_callback function, void *context)
1382 {
1383         acpi_status status = AE_OK;
1384         struct acpi_os_dpc *dpc;
1385         struct workqueue_struct *queue;
1386         int ret;
1387         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1388                           "Scheduling function [%p(%p)] for deferred execution.\n",
1389                           function, context));
1390
1391         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1392                 ret = acpi_debugger_create_thread(function, context);
1393                 if (ret) {
1394                         pr_err("Call to kthread_create() failed.\n");
1395                         status = AE_ERROR;
1396                 }
1397                 goto out_thread;
1398         }
1399
1400         /*
1401          * Allocate/initialize DPC structure.  Note that this memory will be
1402          * freed by the callee.  The kernel handles the work_struct list  in a
1403          * way that allows us to also free its memory inside the callee.
1404          * Because we may want to schedule several tasks with different
1405          * parameters we can't use the approach some kernel code uses of
1406          * having a static work_struct.
1407          */
1408
1409         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1410         if (!dpc)
1411                 return AE_NO_MEMORY;
1412
1413         dpc->function = function;
1414         dpc->context = context;
1415
1416         /*
1417          * To prevent lockdep from complaining unnecessarily, make sure that
1418          * there is a different static lockdep key for each workqueue by using
1419          * INIT_WORK() for each of them separately.
1420          */
1421         if (type == OSL_NOTIFY_HANDLER) {
1422                 queue = kacpi_notify_wq;
1423                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1424         } else if (type == OSL_GPE_HANDLER) {
1425                 queue = kacpid_wq;
1426                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1427         } else {
1428                 pr_err("Unsupported os_execute type %d.\n", type);
1429                 status = AE_ERROR;
1430         }
1431
1432         if (ACPI_FAILURE(status))
1433                 goto err_workqueue;
1434
1435         /*
1436          * On some machines, a software-initiated SMI causes corruption unless
1437          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1438          * typically it's done in GPE-related methods that are run via
1439          * workqueues, so we can avoid the known corruption cases by always
1440          * queueing on CPU 0.
1441          */
1442         ret = queue_work_on(0, queue, &dpc->work);
1443         if (!ret) {
1444                 printk(KERN_ERR PREFIX
1445                           "Call to queue_work() failed.\n");
1446                 status = AE_ERROR;
1447         }
1448 err_workqueue:
1449         if (ACPI_FAILURE(status))
1450                 kfree(dpc);
1451 out_thread:
1452         return status;
1453 }
1454 EXPORT_SYMBOL(acpi_os_execute);
1455
1456 void acpi_os_wait_events_complete(void)
1457 {
1458         /*
1459          * Make sure the GPE handler or the fixed event handler is not used
1460          * on another CPU after removal.
1461          */
1462         if (acpi_sci_irq_valid())
1463                 synchronize_hardirq(acpi_sci_irq);
1464         flush_workqueue(kacpid_wq);
1465         flush_workqueue(kacpi_notify_wq);
1466 }
1467
1468 struct acpi_hp_work {
1469         struct work_struct work;
1470         struct acpi_device *adev;
1471         u32 src;
1472 };
1473
1474 static void acpi_hotplug_work_fn(struct work_struct *work)
1475 {
1476         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1477
1478         acpi_os_wait_events_complete();
1479         acpi_device_hotplug(hpw->adev, hpw->src);
1480         kfree(hpw);
1481 }
1482
1483 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1484 {
1485         struct acpi_hp_work *hpw;
1486
1487         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1488                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1489                   adev, src));
1490
1491         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1492         if (!hpw)
1493                 return AE_NO_MEMORY;
1494
1495         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1496         hpw->adev = adev;
1497         hpw->src = src;
1498         /*
1499          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1500          * the hotplug code may call driver .remove() functions, which may
1501          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1502          * these workqueues.
1503          */
1504         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1505                 kfree(hpw);
1506                 return AE_ERROR;
1507         }
1508         return AE_OK;
1509 }
1510
1511 bool acpi_queue_hotplug_work(struct work_struct *work)
1512 {
1513         return queue_work(kacpi_hotplug_wq, work);
1514 }
1515
1516 acpi_status
1517 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1518 {
1519         struct semaphore *sem = NULL;
1520
1521         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1522         if (!sem)
1523                 return AE_NO_MEMORY;
1524
1525         sema_init(sem, initial_units);
1526
1527         *handle = (acpi_handle *) sem;
1528
1529         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1530                           *handle, initial_units));
1531
1532         return AE_OK;
1533 }
1534
1535 /*
1536  * TODO: A better way to delete semaphores?  Linux doesn't have a
1537  * 'delete_semaphore()' function -- may result in an invalid
1538  * pointer dereference for non-synchronized consumers.  Should
1539  * we at least check for blocked threads and signal/cancel them?
1540  */
1541
1542 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1543 {
1544         struct semaphore *sem = (struct semaphore *)handle;
1545
1546         if (!sem)
1547                 return AE_BAD_PARAMETER;
1548
1549         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1550
1551         BUG_ON(!list_empty(&sem->wait_list));
1552         kfree(sem);
1553         sem = NULL;
1554
1555         return AE_OK;
1556 }
1557
1558 /*
1559  * TODO: Support for units > 1?
1560  */
1561 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1562 {
1563         acpi_status status = AE_OK;
1564         struct semaphore *sem = (struct semaphore *)handle;
1565         long jiffies;
1566         int ret = 0;
1567
1568         if (!acpi_os_initialized)
1569                 return AE_OK;
1570
1571         if (!sem || (units < 1))
1572                 return AE_BAD_PARAMETER;
1573
1574         if (units > 1)
1575                 return AE_SUPPORT;
1576
1577         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1578                           handle, units, timeout));
1579
1580         if (timeout == ACPI_WAIT_FOREVER)
1581                 jiffies = MAX_SCHEDULE_TIMEOUT;
1582         else
1583                 jiffies = msecs_to_jiffies(timeout);
1584
1585         ret = down_timeout(sem, jiffies);
1586         if (ret)
1587                 status = AE_TIME;
1588
1589         if (ACPI_FAILURE(status)) {
1590                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1591                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1592                                   handle, units, timeout,
1593                                   acpi_format_exception(status)));
1594         } else {
1595                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1596                                   "Acquired semaphore[%p|%d|%d]", handle,
1597                                   units, timeout));
1598         }
1599
1600         return status;
1601 }
1602
1603 /*
1604  * TODO: Support for units > 1?
1605  */
1606 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1607 {
1608         struct semaphore *sem = (struct semaphore *)handle;
1609
1610         if (!acpi_os_initialized)
1611                 return AE_OK;
1612
1613         if (!sem || (units < 1))
1614                 return AE_BAD_PARAMETER;
1615
1616         if (units > 1)
1617                 return AE_SUPPORT;
1618
1619         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1620                           units));
1621
1622         up(sem);
1623
1624         return AE_OK;
1625 }
1626
1627 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1628 {
1629 #ifdef ENABLE_DEBUGGER
1630         if (acpi_in_debugger) {
1631                 u32 chars;
1632
1633                 kdb_read(buffer, buffer_length);
1634
1635                 /* remove the CR kdb includes */
1636                 chars = strlen(buffer) - 1;
1637                 buffer[chars] = '\0';
1638         }
1639 #else
1640         int ret;
1641
1642         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1643         if (ret < 0)
1644                 return AE_ERROR;
1645         if (bytes_read)
1646                 *bytes_read = ret;
1647 #endif
1648
1649         return AE_OK;
1650 }
1651 EXPORT_SYMBOL(acpi_os_get_line);
1652
1653 acpi_status acpi_os_wait_command_ready(void)
1654 {
1655         int ret;
1656
1657         ret = acpi_debugger_wait_command_ready();
1658         if (ret < 0)
1659                 return AE_ERROR;
1660         return AE_OK;
1661 }
1662
1663 acpi_status acpi_os_notify_command_complete(void)
1664 {
1665         int ret;
1666
1667         ret = acpi_debugger_notify_command_complete();
1668         if (ret < 0)
1669                 return AE_ERROR;
1670         return AE_OK;
1671 }
1672
1673 acpi_status acpi_os_signal(u32 function, void *info)
1674 {
1675         switch (function) {
1676         case ACPI_SIGNAL_FATAL:
1677                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1678                 break;
1679         case ACPI_SIGNAL_BREAKPOINT:
1680                 /*
1681                  * AML Breakpoint
1682                  * ACPI spec. says to treat it as a NOP unless
1683                  * you are debugging.  So if/when we integrate
1684                  * AML debugger into the kernel debugger its
1685                  * hook will go here.  But until then it is
1686                  * not useful to print anything on breakpoints.
1687                  */
1688                 break;
1689         default:
1690                 break;
1691         }
1692
1693         return AE_OK;
1694 }
1695
1696 static int __init acpi_os_name_setup(char *str)
1697 {
1698         char *p = acpi_os_name;
1699         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1700
1701         if (!str || !*str)
1702                 return 0;
1703
1704         for (; count-- && *str; str++) {
1705                 if (isalnum(*str) || *str == ' ' || *str == ':')
1706                         *p++ = *str;
1707                 else if (*str == '\'' || *str == '"')
1708                         continue;
1709                 else
1710                         break;
1711         }
1712         *p = 0;
1713
1714         return 1;
1715
1716 }
1717
1718 __setup("acpi_os_name=", acpi_os_name_setup);
1719
1720 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1721 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1722
1723 struct osi_setup_entry {
1724         char string[OSI_STRING_LENGTH_MAX];
1725         bool enable;
1726 };
1727
1728 static struct osi_setup_entry
1729                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1730         {"Module Device", true},
1731         {"Processor Device", true},
1732         {"3.0 _SCP Extensions", true},
1733         {"Processor Aggregator Device", true},
1734 };
1735
1736 void __init acpi_osi_setup(char *str)
1737 {
1738         struct osi_setup_entry *osi;
1739         bool enable = true;
1740         int i;
1741
1742         if (!acpi_gbl_create_osi_method)
1743                 return;
1744
1745         if (str == NULL || *str == '\0') {
1746                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1747                 acpi_gbl_create_osi_method = FALSE;
1748                 return;
1749         }
1750
1751         if (*str == '!') {
1752                 str++;
1753                 if (*str == '\0') {
1754                         osi_linux.default_disabling = 1;
1755                         return;
1756                 } else if (*str == '*') {
1757                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1758                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1759                                 osi = &osi_setup_entries[i];
1760                                 osi->enable = false;
1761                         }
1762                         return;
1763                 }
1764                 enable = false;
1765         }
1766
1767         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1768                 osi = &osi_setup_entries[i];
1769                 if (!strcmp(osi->string, str)) {
1770                         osi->enable = enable;
1771                         break;
1772                 } else if (osi->string[0] == '\0') {
1773                         osi->enable = enable;
1774                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1775                         break;
1776                 }
1777         }
1778 }
1779
1780 static void __init set_osi_linux(unsigned int enable)
1781 {
1782         if (osi_linux.enable != enable)
1783                 osi_linux.enable = enable;
1784
1785         if (osi_linux.enable)
1786                 acpi_osi_setup("Linux");
1787         else
1788                 acpi_osi_setup("!Linux");
1789
1790         return;
1791 }
1792
1793 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1794 {
1795         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1796         osi_linux.dmi = 0;
1797         set_osi_linux(enable);
1798
1799         return;
1800 }
1801
1802 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1803 {
1804         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1805
1806         if (enable == -1)
1807                 return;
1808
1809         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1810         set_osi_linux(enable);
1811
1812         return;
1813 }
1814
1815 /*
1816  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1817  *
1818  * empty string disables _OSI
1819  * string starting with '!' disables that string
1820  * otherwise string is added to list, augmenting built-in strings
1821  */
1822 static void __init acpi_osi_setup_late(void)
1823 {
1824         struct osi_setup_entry *osi;
1825         char *str;
1826         int i;
1827         acpi_status status;
1828
1829         if (osi_linux.default_disabling) {
1830                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1831
1832                 if (ACPI_SUCCESS(status))
1833                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1834         }
1835
1836         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1837                 osi = &osi_setup_entries[i];
1838                 str = osi->string;
1839
1840                 if (*str == '\0')
1841                         break;
1842                 if (osi->enable) {
1843                         status = acpi_install_interface(str);
1844
1845                         if (ACPI_SUCCESS(status))
1846                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1847                 } else {
1848                         status = acpi_remove_interface(str);
1849
1850                         if (ACPI_SUCCESS(status))
1851                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1852                 }
1853         }
1854 }
1855
1856 static int __init osi_setup(char *str)
1857 {
1858         if (str && !strcmp("Linux", str))
1859                 acpi_cmdline_osi_linux(1);
1860         else if (str && !strcmp("!Linux", str))
1861                 acpi_cmdline_osi_linux(0);
1862         else
1863                 acpi_osi_setup(str);
1864
1865         return 1;
1866 }
1867
1868 __setup("acpi_osi=", osi_setup);
1869
1870 /*
1871  * Disable the auto-serialization of named objects creation methods.
1872  *
1873  * This feature is enabled by default.  It marks the AML control methods
1874  * that contain the opcodes to create named objects as "Serialized".
1875  */
1876 static int __init acpi_no_auto_serialize_setup(char *str)
1877 {
1878         acpi_gbl_auto_serialize_methods = FALSE;
1879         pr_info("ACPI: auto-serialization disabled\n");
1880
1881         return 1;
1882 }
1883
1884 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1885
1886 /* Check of resource interference between native drivers and ACPI
1887  * OperationRegions (SystemIO and System Memory only).
1888  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1889  * in arbitrary AML code and can interfere with legacy drivers.
1890  * acpi_enforce_resources= can be set to:
1891  *
1892  *   - strict (default) (2)
1893  *     -> further driver trying to access the resources will not load
1894  *   - lax              (1)
1895  *     -> further driver trying to access the resources will load, but you
1896  *     get a system message that something might go wrong...
1897  *
1898  *   - no               (0)
1899  *     -> ACPI Operation Region resources will not be registered
1900  *
1901  */
1902 #define ENFORCE_RESOURCES_STRICT 2
1903 #define ENFORCE_RESOURCES_LAX    1
1904 #define ENFORCE_RESOURCES_NO     0
1905
1906 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1907
1908 static int __init acpi_enforce_resources_setup(char *str)
1909 {
1910         if (str == NULL || *str == '\0')
1911                 return 0;
1912
1913         if (!strcmp("strict", str))
1914                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1915         else if (!strcmp("lax", str))
1916                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1917         else if (!strcmp("no", str))
1918                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1919
1920         return 1;
1921 }
1922
1923 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1924
1925 /* Check for resource conflicts between ACPI OperationRegions and native
1926  * drivers */
1927 int acpi_check_resource_conflict(const struct resource *res)
1928 {
1929         acpi_adr_space_type space_id;
1930         acpi_size length;
1931         u8 warn = 0;
1932         int clash = 0;
1933
1934         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1935                 return 0;
1936         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1937                 return 0;
1938
1939         if (res->flags & IORESOURCE_IO)
1940                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1941         else
1942                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1943
1944         length = resource_size(res);
1945         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1946                 warn = 1;
1947         clash = acpi_check_address_range(space_id, res->start, length, warn);
1948
1949         if (clash) {
1950                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1951                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1952                                 printk(KERN_NOTICE "ACPI: This conflict may"
1953                                        " cause random problems and system"
1954                                        " instability\n");
1955                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1956                                " for this device, you should use it instead of"
1957                                " the native driver\n");
1958                 }
1959                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1960                         return -EBUSY;
1961         }
1962         return 0;
1963 }
1964 EXPORT_SYMBOL(acpi_check_resource_conflict);
1965
1966 int acpi_check_region(resource_size_t start, resource_size_t n,
1967                       const char *name)
1968 {
1969         struct resource res = {
1970                 .start = start,
1971                 .end   = start + n - 1,
1972                 .name  = name,
1973                 .flags = IORESOURCE_IO,
1974         };
1975
1976         return acpi_check_resource_conflict(&res);
1977 }
1978 EXPORT_SYMBOL(acpi_check_region);
1979
1980 /*
1981  * Let drivers know whether the resource checks are effective
1982  */
1983 int acpi_resources_are_enforced(void)
1984 {
1985         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1986 }
1987 EXPORT_SYMBOL(acpi_resources_are_enforced);
1988
1989 bool acpi_osi_is_win8(void)
1990 {
1991         return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
1992 }
1993 EXPORT_SYMBOL(acpi_osi_is_win8);
1994
1995 /*
1996  * Deallocate the memory for a spinlock.
1997  */
1998 void acpi_os_delete_lock(acpi_spinlock handle)
1999 {
2000         ACPI_FREE(handle);
2001 }
2002
2003 /*
2004  * Acquire a spinlock.
2005  *
2006  * handle is a pointer to the spinlock_t.
2007  */
2008
2009 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
2010 {
2011         acpi_cpu_flags flags;
2012         spin_lock_irqsave(lockp, flags);
2013         return flags;
2014 }
2015
2016 /*
2017  * Release a spinlock. See above.
2018  */
2019
2020 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
2021 {
2022         spin_unlock_irqrestore(lockp, flags);
2023 }
2024
2025 #ifndef ACPI_USE_LOCAL_CACHE
2026
2027 /*******************************************************************************
2028  *
2029  * FUNCTION:    acpi_os_create_cache
2030  *
2031  * PARAMETERS:  name      - Ascii name for the cache
2032  *              size      - Size of each cached object
2033  *              depth     - Maximum depth of the cache (in objects) <ignored>
2034  *              cache     - Where the new cache object is returned
2035  *
2036  * RETURN:      status
2037  *
2038  * DESCRIPTION: Create a cache object
2039  *
2040  ******************************************************************************/
2041
2042 acpi_status
2043 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
2044 {
2045         *cache = kmem_cache_create(name, size, 0, 0, NULL);
2046         if (*cache == NULL)
2047                 return AE_ERROR;
2048         else
2049                 return AE_OK;
2050 }
2051
2052 /*******************************************************************************
2053  *
2054  * FUNCTION:    acpi_os_purge_cache
2055  *
2056  * PARAMETERS:  Cache           - Handle to cache object
2057  *
2058  * RETURN:      Status
2059  *
2060  * DESCRIPTION: Free all objects within the requested cache.
2061  *
2062  ******************************************************************************/
2063
2064 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
2065 {
2066         kmem_cache_shrink(cache);
2067         return (AE_OK);
2068 }
2069
2070 /*******************************************************************************
2071  *
2072  * FUNCTION:    acpi_os_delete_cache
2073  *
2074  * PARAMETERS:  Cache           - Handle to cache object
2075  *
2076  * RETURN:      Status
2077  *
2078  * DESCRIPTION: Free all objects within the requested cache and delete the
2079  *              cache object.
2080  *
2081  ******************************************************************************/
2082
2083 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
2084 {
2085         kmem_cache_destroy(cache);
2086         return (AE_OK);
2087 }
2088
2089 /*******************************************************************************
2090  *
2091  * FUNCTION:    acpi_os_release_object
2092  *
2093  * PARAMETERS:  Cache       - Handle to cache object
2094  *              Object      - The object to be released
2095  *
2096  * RETURN:      None
2097  *
2098  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
2099  *              the object is deleted.
2100  *
2101  ******************************************************************************/
2102
2103 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
2104 {
2105         kmem_cache_free(cache, object);
2106         return (AE_OK);
2107 }
2108 #endif
2109
2110 static int __init acpi_no_static_ssdt_setup(char *s)
2111 {
2112         acpi_gbl_disable_ssdt_table_install = TRUE;
2113         pr_info("ACPI: static SSDT installation disabled\n");
2114
2115         return 0;
2116 }
2117
2118 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
2119
2120 static int __init acpi_disable_return_repair(char *s)
2121 {
2122         printk(KERN_NOTICE PREFIX
2123                "ACPI: Predefined validation mechanism disabled\n");
2124         acpi_gbl_disable_auto_repair = TRUE;
2125
2126         return 1;
2127 }
2128
2129 __setup("acpica_no_return_repair", acpi_disable_return_repair);
2130
2131 acpi_status __init acpi_os_initialize(void)
2132 {
2133         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
2134         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
2135         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
2136         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
2137         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
2138                 /*
2139                  * Use acpi_os_map_generic_address to pre-map the reset
2140                  * register if it's in system memory.
2141                  */
2142                 int rv;
2143
2144                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
2145                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
2146         }
2147         acpi_os_initialized = true;
2148
2149         return AE_OK;
2150 }
2151
2152 acpi_status __init acpi_os_initialize1(void)
2153 {
2154         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
2155         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
2156         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
2157         BUG_ON(!kacpid_wq);
2158         BUG_ON(!kacpi_notify_wq);
2159         BUG_ON(!kacpi_hotplug_wq);
2160         acpi_install_interface_handler(acpi_osi_handler);
2161         acpi_osi_setup_late();
2162         return AE_OK;
2163 }
2164
2165 acpi_status acpi_os_terminate(void)
2166 {
2167         if (acpi_irq_handler) {
2168                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
2169                                                  acpi_irq_handler);
2170         }
2171
2172         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
2173         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
2174         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
2175         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
2176         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
2177                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
2178
2179         destroy_workqueue(kacpid_wq);
2180         destroy_workqueue(kacpi_notify_wq);
2181         destroy_workqueue(kacpi_hotplug_wq);
2182
2183         return AE_OK;
2184 }
2185
2186 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
2187                                   u32 pm1b_control)
2188 {
2189         int rc = 0;
2190         if (__acpi_os_prepare_sleep)
2191                 rc = __acpi_os_prepare_sleep(sleep_state,
2192                                              pm1a_control, pm1b_control);
2193         if (rc < 0)
2194                 return AE_ERROR;
2195         else if (rc > 0)
2196                 return AE_CTRL_SKIP;
2197
2198         return AE_OK;
2199 }
2200
2201 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
2202                                u32 pm1a_ctrl, u32 pm1b_ctrl))
2203 {
2204         __acpi_os_prepare_sleep = func;
2205 }
2206
2207 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
2208                                   u32 val_b)
2209 {
2210         int rc = 0;
2211         if (__acpi_os_prepare_extended_sleep)
2212                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
2213                                              val_a, val_b);
2214         if (rc < 0)
2215                 return AE_ERROR;
2216         else if (rc > 0)
2217                 return AE_CTRL_SKIP;
2218
2219         return AE_OK;
2220 }
2221
2222 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
2223                                u32 val_a, u32 val_b))
2224 {
2225         __acpi_os_prepare_extended_sleep = func;
2226 }