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