drivers/acpi/osl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   4  *
   5  *  Copyright (C) 2000       Andrew Henroid
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *  Copyright (c) 2008 Intel Corporation
   9  *   Author: Matthew Wilcox <willy@linux.intel.com>
  10  */
  11
  12 #define pr_fmt(fmt) "ACPI: OSL: " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/mm.h>
  18 #include <linux/highmem.h>
  19 #include <linux/lockdep.h>
  20 #include <linux/pci.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/kmod.h>
  23 #include <linux/delay.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/nmi.h>
  26 #include <linux/acpi.h>
  27 #include <linux/efi.h>
  28 #include <linux/ioport.h>
  29 #include <linux/list.h>
  30 #include <linux/jiffies.h>
  31 #include <linux/semaphore.h>
  32 #include <linux/security.h>
  33
  34 #include <asm/io.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/io-64-nonatomic-lo-hi.h>
  37
  38 #include "acpica/accommon.h"
  39 #include "acpica/acnamesp.h"
  40 #include "internal.h"
  41
  42 /* Definitions for ACPI_DEBUG_PRINT() */
  43 #define _COMPONENT              ACPI_OS_SERVICES
  44 ACPI_MODULE_NAME("osl");
  45
  46 struct acpi_os_dpc {
  47         acpi_osd_exec_callback function;
  48         void *context;
  49         struct work_struct work;
  50 };
  51
  52 #ifdef ENABLE_DEBUGGER
  53 #include <linux/kdb.h>
  54
  55 /* stuff for debugger support */
  56 int acpi_in_debugger;
  57 EXPORT_SYMBOL(acpi_in_debugger);
  58 #endif                          /*ENABLE_DEBUGGER */
  59
  60 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  61                                       u32 pm1b_ctrl);
  62 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  63                                       u32 val_b);
  64
  65 static acpi_osd_handler acpi_irq_handler;
  66 static void *acpi_irq_context;
  67 static struct workqueue_struct *kacpid_wq;
  68 static struct workqueue_struct *kacpi_notify_wq;
  69 static struct workqueue_struct *kacpi_hotplug_wq;
  70 static bool acpi_os_initialized;
  71 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  72 bool acpi_permanent_mmap = false;
  73
  74 /*
  75  * This list of permanent mappings is for memory that may be accessed from
  76  * interrupt context, where we can't do the ioremap().
  77  */
  78 struct acpi_ioremap {
  79         struct list_head list;
  80         void __iomem *virt;
  81         acpi_physical_address phys;
  82         acpi_size size;
  83         union {
  84                 unsigned long refcount;
  85                 struct rcu_work rwork;
  86         } track;
  87 };
  88
  89 static LIST_HEAD(acpi_ioremaps);
  90 static DEFINE_MUTEX(acpi_ioremap_lock);
  91 #define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
  92
  93 static void __init acpi_request_region (struct acpi_generic_address *gas,
  94         unsigned int length, char *desc)
  95 {
  96         u64 addr;
  97
  98         /* Handle possible alignment issues */
  99         memcpy(&addr, &gas->address, sizeof(addr));
 100         if (!addr || !length)
 101                 return;
 102
 103         /* Resources are never freed */
 104         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 105                 request_region(addr, length, desc);
 106         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 107                 request_mem_region(addr, length, desc);
 108 }
 109
 110 static int __init acpi_reserve_resources(void)
 111 {
 112         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 113                 "ACPI PM1a_EVT_BLK");
 114
 115         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 116                 "ACPI PM1b_EVT_BLK");
 117
 118         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 119                 "ACPI PM1a_CNT_BLK");
 120
 121         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 122                 "ACPI PM1b_CNT_BLK");
 123
 124         if (acpi_gbl_FADT.pm_timer_length == 4)
 125                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 126
 127         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 128                 "ACPI PM2_CNT_BLK");
 129
 130         /* Length of GPE blocks must be a non-negative multiple of 2 */
 131
 132         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 133                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 134                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 135
 136         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 137                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 138                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 139
 140         return 0;
 141 }
 142 fs_initcall_sync(acpi_reserve_resources);
 143
 144 void acpi_os_printf(const char *fmt, ...)
 145 {
 146         va_list args;
 147         va_start(args, fmt);
 148         acpi_os_vprintf(fmt, args);
 149         va_end(args);
 150 }
 151 EXPORT_SYMBOL(acpi_os_printf);
 152
 153 void acpi_os_vprintf(const char *fmt, va_list args)
 154 {
 155         static char buffer[512];
 156
 157         vsprintf(buffer, fmt, args);
 158
 159 #ifdef ENABLE_DEBUGGER
 160         if (acpi_in_debugger) {
 161                 kdb_printf("%s", buffer);
 162         } else {
 163                 if (printk_get_level(buffer))
 164                         printk("%s", buffer);
 165                 else
 166                         printk(KERN_CONT "%s", buffer);
 167         }
 168 #else
 169         if (acpi_debugger_write_log(buffer) < 0) {
 170                 if (printk_get_level(buffer))
 171                         printk("%s", buffer);
 172                 else
 173                         printk(KERN_CONT "%s", buffer);
 174         }
 175 #endif
 176 }
 177
 178 #ifdef CONFIG_KEXEC
 179 static unsigned long acpi_rsdp;
 180 static int __init setup_acpi_rsdp(char *arg)
 181 {
 182         return kstrtoul(arg, 16, &acpi_rsdp);
 183 }
 184 early_param("acpi_rsdp", setup_acpi_rsdp);
 185 #endif
 186
 187 acpi_physical_address __init acpi_os_get_root_pointer(void)
 188 {
 189         acpi_physical_address pa;
 190
 191 #ifdef CONFIG_KEXEC
 192         /*
 193          * We may have been provided with an RSDP on the command line,
 194          * but if a malicious user has done so they may be pointing us
 195          * at modified ACPI tables that could alter kernel behaviour -
 196          * so, we check the lockdown status before making use of
 197          * it. If we trust it then also stash it in an architecture
 198          * specific location (if appropriate) so it can be carried
 199          * over further kexec()s.
 200          */
 201         if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
 202                 acpi_arch_set_root_pointer(acpi_rsdp);
 203                 return acpi_rsdp;
 204         }
 205 #endif
 206         pa = acpi_arch_get_root_pointer();
 207         if (pa)
 208                 return pa;
 209
 210         if (efi_enabled(EFI_CONFIG_TABLES)) {
 211                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 212                         return efi.acpi20;
 213                 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 214                         return efi.acpi;
 215                 pr_err(PREFIX "System description tables not found\n");
 216         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 217                 acpi_find_root_pointer(&pa);
 218         }
 219
 220         return pa;
 221 }
 222
 223 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 224 static struct acpi_ioremap *
 225 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 226 {
 227         struct acpi_ioremap *map;
 228
 229         list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
 230                 if (map->phys <= phys &&
 231                     phys + size <= map->phys + map->size)
 232                         return map;
 233
 234         return NULL;
 235 }
 236
 237 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 238 static void __iomem *
 239 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 240 {
 241         struct acpi_ioremap *map;
 242
 243         map = acpi_map_lookup(phys, size);
 244         if (map)
 245                 return map->virt + (phys - map->phys);
 246
 247         return NULL;
 248 }
 249
 250 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 251 {
 252         struct acpi_ioremap *map;
 253         void __iomem *virt = NULL;
 254
 255         mutex_lock(&acpi_ioremap_lock);
 256         map = acpi_map_lookup(phys, size);
 257         if (map) {
 258                 virt = map->virt + (phys - map->phys);
 259                 map->track.refcount++;
 260         }
 261         mutex_unlock(&acpi_ioremap_lock);
 262         return virt;
 263 }
 264 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 265
 266 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 267 static struct acpi_ioremap *
 268 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 269 {
 270         struct acpi_ioremap *map;
 271
 272         list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
 273                 if (map->virt <= virt &&
 274                     virt + size <= map->virt + map->size)
 275                         return map;
 276
 277         return NULL;
 278 }
 279
 280 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 281 /* ioremap will take care of cache attributes */
 282 #define should_use_kmap(pfn)   0
 283 #else
 284 #define should_use_kmap(pfn)   page_is_ram(pfn)
 285 #endif
 286
 287 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 288 {
 289         unsigned long pfn;
 290
 291         pfn = pg_off >> PAGE_SHIFT;
 292         if (should_use_kmap(pfn)) {
 293                 if (pg_sz > PAGE_SIZE)
 294                         return NULL;
 295                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 296         } else
 297                 return acpi_os_ioremap(pg_off, pg_sz);
 298 }
 299
 300 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 301 {
 302         unsigned long pfn;
 303
 304         pfn = pg_off >> PAGE_SHIFT;
 305         if (should_use_kmap(pfn))
 306                 kunmap(pfn_to_page(pfn));
 307         else
 308                 iounmap(vaddr);
 309 }
 310
 311 /**
 312  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 313  * @phys: Start of the physical address range to map.
 314  * @size: Size of the physical address range to map.
 315  *
 316  * Look up the given physical address range in the list of existing ACPI memory
 317  * mappings.  If found, get a reference to it and return a pointer to it (its
 318  * virtual address).  If not found, map it, add it to that list and return a
 319  * pointer to it.
 320  *
 321  * During early init (when acpi_permanent_mmap has not been set yet) this
 322  * routine simply calls __acpi_map_table() to get the job done.
 323  */
 324 void __iomem __ref
 325 *acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 326 {
 327         struct acpi_ioremap *map;
 328         void __iomem *virt;
 329         acpi_physical_address pg_off;
 330         acpi_size pg_sz;
 331
 332         if (phys > ULONG_MAX) {
 333                 pr_err("Cannot map memory that high: 0x%llx\n", phys);
 334                 return NULL;
 335         }
 336
 337         if (!acpi_permanent_mmap)
 338                 return __acpi_map_table((unsigned long)phys, size);
 339
 340         mutex_lock(&acpi_ioremap_lock);
 341         /* Check if there's a suitable mapping already. */
 342         map = acpi_map_lookup(phys, size);
 343         if (map) {
 344                 map->track.refcount++;
 345                 goto out;
 346         }
 347
 348         map = kzalloc(sizeof(*map), GFP_KERNEL);
 349         if (!map) {
 350                 mutex_unlock(&acpi_ioremap_lock);
 351                 return NULL;
 352         }
 353
 354         pg_off = round_down(phys, PAGE_SIZE);
 355         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 356         virt = acpi_map(phys, size);
 357         if (!virt) {
 358                 mutex_unlock(&acpi_ioremap_lock);
 359                 kfree(map);
 360                 return NULL;
 361         }
 362
 363         INIT_LIST_HEAD(&map->list);
 364         map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
 365         map->phys = pg_off;
 366         map->size = pg_sz;
 367         map->track.refcount = 1;
 368
 369         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 370
 371 out:
 372         mutex_unlock(&acpi_ioremap_lock);
 373         return map->virt + (phys - map->phys);
 374 }
 375 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 376
 377 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 378 {
 379         return (void *)acpi_os_map_iomem(phys, size);
 380 }
 381 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 382
 383 static void acpi_os_map_remove(struct work_struct *work)
 384 {
 385         struct acpi_ioremap *map = container_of(to_rcu_work(work),
 386                                                 struct acpi_ioremap,
 387                                                 track.rwork);
 388
 389         acpi_unmap(map->phys, map->virt);
 390         kfree(map);
 391 }
 392
 393 /* Must be called with mutex_lock(&acpi_ioremap_lock) */
 394 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 395 {
 396         if (--map->track.refcount)
 397                 return;
 398
 399         list_del_rcu(&map->list);
 400
 401         INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
 402         queue_rcu_work(system_wq, &map->track.rwork);
 403 }
 404
 405 /**
 406  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 407  * @virt: Start of the address range to drop a reference to.
 408  * @size: Size of the address range to drop a reference to.
 409  *
 410  * Look up the given virtual address range in the list of existing ACPI memory
 411  * mappings, drop a reference to it and if there are no more active references
 412  * to it, queue it up for later removal.
 413  *
 414  * During early init (when acpi_permanent_mmap has not been set yet) this
 415  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 416  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 417  * here.
 418  */
 419 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 420 {
 421         struct acpi_ioremap *map;
 422
 423         if (!acpi_permanent_mmap) {
 424                 __acpi_unmap_table(virt, size);
 425                 return;
 426         }
 427
 428         mutex_lock(&acpi_ioremap_lock);
 429
 430         map = acpi_map_lookup_virt(virt, size);
 431         if (!map) {
 432                 mutex_unlock(&acpi_ioremap_lock);
 433                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 434                 return;
 435         }
 436         acpi_os_drop_map_ref(map);
 437
 438         mutex_unlock(&acpi_ioremap_lock);
 439 }
 440 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 441
 442 /**
 443  * acpi_os_unmap_memory - Drop a memory mapping reference.
 444  * @virt: Start of the address range to drop a reference to.
 445  * @size: Size of the address range to drop a reference to.
 446  */
 447 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 448 {
 449         acpi_os_unmap_iomem((void __iomem *)virt, size);
 450 }
 451 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 452
 453 void __iomem *acpi_os_map_generic_address(struct acpi_generic_address *gas)
 454 {
 455         u64 addr;
 456
 457         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 458                 return NULL;
 459
 460         /* Handle possible alignment issues */
 461         memcpy(&addr, &gas->address, sizeof(addr));
 462         if (!addr || !gas->bit_width)
 463                 return NULL;
 464
 465         return acpi_os_map_iomem(addr, gas->bit_width / 8);
 466 }
 467 EXPORT_SYMBOL(acpi_os_map_generic_address);
 468
 469 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 470 {
 471         u64 addr;
 472         struct acpi_ioremap *map;
 473
 474         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 475                 return;
 476
 477         /* Handle possible alignment issues */
 478         memcpy(&addr, &gas->address, sizeof(addr));
 479         if (!addr || !gas->bit_width)
 480                 return;
 481
 482         mutex_lock(&acpi_ioremap_lock);
 483
 484         map = acpi_map_lookup(addr, gas->bit_width / 8);
 485         if (!map) {
 486                 mutex_unlock(&acpi_ioremap_lock);
 487                 return;
 488         }
 489         acpi_os_drop_map_ref(map);
 490
 491         mutex_unlock(&acpi_ioremap_lock);
 492 }
 493 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 494
 495 #ifdef ACPI_FUTURE_USAGE
 496 acpi_status
 497 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 498 {
 499         if (!phys || !virt)
 500                 return AE_BAD_PARAMETER;
 501
 502         *phys = virt_to_phys(virt);
 503
 504         return AE_OK;
 505 }
 506 #endif
 507
 508 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 509 static bool acpi_rev_override;
 510
 511 int __init acpi_rev_override_setup(char *str)
 512 {
 513         acpi_rev_override = true;
 514         return 1;
 515 }
 516 __setup("acpi_rev_override", acpi_rev_override_setup);
 517 #else
 518 #define acpi_rev_override       false
 519 #endif
 520
 521 #define ACPI_MAX_OVERRIDE_LEN 100
 522
 523 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 524
 525 acpi_status
 526 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 527                             acpi_string *new_val)
 528 {
 529         if (!init_val || !new_val)
 530                 return AE_BAD_PARAMETER;
 531
 532         *new_val = NULL;
 533         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 534                 pr_info("Overriding _OS definition to '%s'\n", acpi_os_name);
 535                 *new_val = acpi_os_name;
 536         }
 537
 538         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 539                 pr_info("Overriding _REV return value to 5\n");
 540                 *new_val = (char *)5;
 541         }
 542
 543         return AE_OK;
 544 }
 545
 546 static irqreturn_t acpi_irq(int irq, void *dev_id)
 547 {
 548         u32 handled;
 549
 550         handled = (*acpi_irq_handler) (acpi_irq_context);
 551
 552         if (handled) {
 553                 acpi_irq_handled++;
 554                 return IRQ_HANDLED;
 555         } else {
 556                 acpi_irq_not_handled++;
 557                 return IRQ_NONE;
 558         }
 559 }
 560
 561 acpi_status
 562 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 563                                   void *context)
 564 {
 565         unsigned int irq;
 566
 567         acpi_irq_stats_init();
 568
 569         /*
 570          * ACPI interrupts different from the SCI in our copy of the FADT are
 571          * not supported.
 572          */
 573         if (gsi != acpi_gbl_FADT.sci_interrupt)
 574                 return AE_BAD_PARAMETER;
 575
 576         if (acpi_irq_handler)
 577                 return AE_ALREADY_ACQUIRED;
 578
 579         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 580                 pr_err("SCI (ACPI GSI %d) not registered\n", gsi);
 581                 return AE_OK;
 582         }
 583
 584         acpi_irq_handler = handler;
 585         acpi_irq_context = context;
 586         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 587                 pr_err("SCI (IRQ%d) allocation failed\n", irq);
 588                 acpi_irq_handler = NULL;
 589                 return AE_NOT_ACQUIRED;
 590         }
 591         acpi_sci_irq = irq;
 592
 593         return AE_OK;
 594 }
 595
 596 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 597 {
 598         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 599                 return AE_BAD_PARAMETER;
 600
 601         free_irq(acpi_sci_irq, acpi_irq);
 602         acpi_irq_handler = NULL;
 603         acpi_sci_irq = INVALID_ACPI_IRQ;
 604
 605         return AE_OK;
 606 }
 607
 608 /*
 609  * Running in interpreter thread context, safe to sleep
 610  */
 611
 612 void acpi_os_sleep(u64 ms)
 613 {
 614         msleep(ms);
 615 }
 616
 617 void acpi_os_stall(u32 us)
 618 {
 619         while (us) {
 620                 u32 delay = 1000;
 621
 622                 if (delay > us)
 623                         delay = us;
 624                 udelay(delay);
 625                 touch_nmi_watchdog();
 626                 us -= delay;
 627         }
 628 }
 629
 630 /*
 631  * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
 632  * monotonically increasing timer with 100ns granularity. Do not use
 633  * ktime_get() to implement this function because this function may get
 634  * called after timekeeping has been suspended. Note: calling this function
 635  * after timekeeping has been suspended may lead to unexpected results
 636  * because when timekeeping is suspended the jiffies counter is not
 637  * incremented. See also timekeeping_suspend().
 638  */
 639 u64 acpi_os_get_timer(void)
 640 {
 641         return (get_jiffies_64() - INITIAL_JIFFIES) *
 642                 (ACPI_100NSEC_PER_SEC / HZ);
 643 }
 644
 645 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 646 {
 647         u32 dummy;
 648
 649         if (!value)
 650                 value = &dummy;
 651
 652         *value = 0;
 653         if (width <= 8) {
 654                 *(u8 *) value = inb(port);
 655         } else if (width <= 16) {
 656                 *(u16 *) value = inw(port);
 657         } else if (width <= 32) {
 658                 *(u32 *) value = inl(port);
 659         } else {
 660                 BUG();
 661         }
 662
 663         return AE_OK;
 664 }
 665
 666 EXPORT_SYMBOL(acpi_os_read_port);
 667
 668 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 669 {
 670         if (width <= 8) {
 671                 outb(value, port);
 672         } else if (width <= 16) {
 673                 outw(value, port);
 674         } else if (width <= 32) {
 675                 outl(value, port);
 676         } else {
 677                 BUG();
 678         }
 679
 680         return AE_OK;
 681 }
 682
 683 EXPORT_SYMBOL(acpi_os_write_port);
 684
 685 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 686 {
 687
 688         switch (width) {
 689         case 8:
 690                 *(u8 *) value = readb(virt_addr);
 691                 break;
 692         case 16:
 693                 *(u16 *) value = readw(virt_addr);
 694                 break;
 695         case 32:
 696                 *(u32 *) value = readl(virt_addr);
 697                 break;
 698         case 64:
 699                 *(u64 *) value = readq(virt_addr);
 700                 break;
 701         default:
 702                 return -EINVAL;
 703         }
 704
 705         return 0;
 706 }
 707
 708 acpi_status
 709 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 710 {
 711         void __iomem *virt_addr;
 712         unsigned int size = width / 8;
 713         bool unmap = false;
 714         u64 dummy;
 715         int error;
 716
 717         rcu_read_lock();
 718         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 719         if (!virt_addr) {
 720                 rcu_read_unlock();
 721                 virt_addr = acpi_os_ioremap(phys_addr, size);
 722                 if (!virt_addr)
 723                         return AE_BAD_ADDRESS;
 724                 unmap = true;
 725         }
 726
 727         if (!value)
 728                 value = &dummy;
 729
 730         error = acpi_os_read_iomem(virt_addr, value, width);
 731         BUG_ON(error);
 732
 733         if (unmap)
 734                 iounmap(virt_addr);
 735         else
 736                 rcu_read_unlock();
 737
 738         return AE_OK;
 739 }
 740
 741 acpi_status
 742 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 743 {
 744         void __iomem *virt_addr;
 745         unsigned int size = width / 8;
 746         bool unmap = false;
 747
 748         rcu_read_lock();
 749         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 750         if (!virt_addr) {
 751                 rcu_read_unlock();
 752                 virt_addr = acpi_os_ioremap(phys_addr, size);
 753                 if (!virt_addr)
 754                         return AE_BAD_ADDRESS;
 755                 unmap = true;
 756         }
 757
 758         switch (width) {
 759         case 8:
 760                 writeb(value, virt_addr);
 761                 break;
 762         case 16:
 763                 writew(value, virt_addr);
 764                 break;
 765         case 32:
 766                 writel(value, virt_addr);
 767                 break;
 768         case 64:
 769                 writeq(value, virt_addr);
 770                 break;
 771         default:
 772                 BUG();
 773         }
 774
 775         if (unmap)
 776                 iounmap(virt_addr);
 777         else
 778                 rcu_read_unlock();
 779
 780         return AE_OK;
 781 }
 782
 783 #ifdef CONFIG_PCI
 784 acpi_status
 785 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 786                                u64 *value, u32 width)
 787 {
 788         int result, size;
 789         u32 value32;
 790
 791         if (!value)
 792                 return AE_BAD_PARAMETER;
 793
 794         switch (width) {
 795         case 8:
 796                 size = 1;
 797                 break;
 798         case 16:
 799                 size = 2;
 800                 break;
 801         case 32:
 802                 size = 4;
 803                 break;
 804         default:
 805                 return AE_ERROR;
 806         }
 807
 808         result = raw_pci_read(pci_id->segment, pci_id->bus,
 809                                 PCI_DEVFN(pci_id->device, pci_id->function),
 810                                 reg, size, &value32);
 811         *value = value32;
 812
 813         return (result ? AE_ERROR : AE_OK);
 814 }
 815
 816 acpi_status
 817 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 818                                 u64 value, u32 width)
 819 {
 820         int result, size;
 821
 822         switch (width) {
 823         case 8:
 824                 size = 1;
 825                 break;
 826         case 16:
 827                 size = 2;
 828                 break;
 829         case 32:
 830                 size = 4;
 831                 break;
 832         default:
 833                 return AE_ERROR;
 834         }
 835
 836         result = raw_pci_write(pci_id->segment, pci_id->bus,
 837                                 PCI_DEVFN(pci_id->device, pci_id->function),
 838                                 reg, size, value);
 839
 840         return (result ? AE_ERROR : AE_OK);
 841 }
 842 #endif
 843
 844 static void acpi_os_execute_deferred(struct work_struct *work)
 845 {
 846         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 847
 848         dpc->function(dpc->context);
 849         kfree(dpc);
 850 }
 851
 852 #ifdef CONFIG_ACPI_DEBUGGER
 853 static struct acpi_debugger acpi_debugger;
 854 static bool acpi_debugger_initialized;
 855
 856 int acpi_register_debugger(struct module *owner,
 857                            const struct acpi_debugger_ops *ops)
 858 {
 859         int ret = 0;
 860
 861         mutex_lock(&acpi_debugger.lock);
 862         if (acpi_debugger.ops) {
 863                 ret = -EBUSY;
 864                 goto err_lock;
 865         }
 866
 867         acpi_debugger.owner = owner;
 868         acpi_debugger.ops = ops;
 869
 870 err_lock:
 871         mutex_unlock(&acpi_debugger.lock);
 872         return ret;
 873 }
 874 EXPORT_SYMBOL(acpi_register_debugger);
 875
 876 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 877 {
 878         mutex_lock(&acpi_debugger.lock);
 879         if (ops == acpi_debugger.ops) {
 880                 acpi_debugger.ops = NULL;
 881                 acpi_debugger.owner = NULL;
 882         }
 883         mutex_unlock(&acpi_debugger.lock);
 884 }
 885 EXPORT_SYMBOL(acpi_unregister_debugger);
 886
 887 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 888 {
 889         int ret;
 890         int (*func)(acpi_osd_exec_callback, void *);
 891         struct module *owner;
 892
 893         if (!acpi_debugger_initialized)
 894                 return -ENODEV;
 895         mutex_lock(&acpi_debugger.lock);
 896         if (!acpi_debugger.ops) {
 897                 ret = -ENODEV;
 898                 goto err_lock;
 899         }
 900         if (!try_module_get(acpi_debugger.owner)) {
 901                 ret = -ENODEV;
 902                 goto err_lock;
 903         }
 904         func = acpi_debugger.ops->create_thread;
 905         owner = acpi_debugger.owner;
 906         mutex_unlock(&acpi_debugger.lock);
 907
 908         ret = func(function, context);
 909
 910         mutex_lock(&acpi_debugger.lock);
 911         module_put(owner);
 912 err_lock:
 913         mutex_unlock(&acpi_debugger.lock);
 914         return ret;
 915 }
 916
 917 ssize_t acpi_debugger_write_log(const char *msg)
 918 {
 919         ssize_t ret;
 920         ssize_t (*func)(const char *);
 921         struct module *owner;
 922
 923         if (!acpi_debugger_initialized)
 924                 return -ENODEV;
 925         mutex_lock(&acpi_debugger.lock);
 926         if (!acpi_debugger.ops) {
 927                 ret = -ENODEV;
 928                 goto err_lock;
 929         }
 930         if (!try_module_get(acpi_debugger.owner)) {
 931                 ret = -ENODEV;
 932                 goto err_lock;
 933         }
 934         func = acpi_debugger.ops->write_log;
 935         owner = acpi_debugger.owner;
 936         mutex_unlock(&acpi_debugger.lock);
 937
 938         ret = func(msg);
 939
 940         mutex_lock(&acpi_debugger.lock);
 941         module_put(owner);
 942 err_lock:
 943         mutex_unlock(&acpi_debugger.lock);
 944         return ret;
 945 }
 946
 947 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 948 {
 949         ssize_t ret;
 950         ssize_t (*func)(char *, size_t);
 951         struct module *owner;
 952
 953         if (!acpi_debugger_initialized)
 954                 return -ENODEV;
 955         mutex_lock(&acpi_debugger.lock);
 956         if (!acpi_debugger.ops) {
 957                 ret = -ENODEV;
 958                 goto err_lock;
 959         }
 960         if (!try_module_get(acpi_debugger.owner)) {
 961                 ret = -ENODEV;
 962                 goto err_lock;
 963         }
 964         func = acpi_debugger.ops->read_cmd;
 965         owner = acpi_debugger.owner;
 966         mutex_unlock(&acpi_debugger.lock);
 967
 968         ret = func(buffer, buffer_length);
 969
 970         mutex_lock(&acpi_debugger.lock);
 971         module_put(owner);
 972 err_lock:
 973         mutex_unlock(&acpi_debugger.lock);
 974         return ret;
 975 }
 976
 977 int acpi_debugger_wait_command_ready(void)
 978 {
 979         int ret;
 980         int (*func)(bool, char *, size_t);
 981         struct module *owner;
 982
 983         if (!acpi_debugger_initialized)
 984                 return -ENODEV;
 985         mutex_lock(&acpi_debugger.lock);
 986         if (!acpi_debugger.ops) {
 987                 ret = -ENODEV;
 988                 goto err_lock;
 989         }
 990         if (!try_module_get(acpi_debugger.owner)) {
 991                 ret = -ENODEV;
 992                 goto err_lock;
 993         }
 994         func = acpi_debugger.ops->wait_command_ready;
 995         owner = acpi_debugger.owner;
 996         mutex_unlock(&acpi_debugger.lock);
 997
 998         ret = func(acpi_gbl_method_executing,
 999                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1000
1001         mutex_lock(&acpi_debugger.lock);
1002         module_put(owner);
1003 err_lock:
1004         mutex_unlock(&acpi_debugger.lock);
1005         return ret;
1006 }
1007
1008 int acpi_debugger_notify_command_complete(void)
1009 {
1010         int ret;
1011         int (*func)(void);
1012         struct module *owner;
1013
1014         if (!acpi_debugger_initialized)
1015                 return -ENODEV;
1016         mutex_lock(&acpi_debugger.lock);
1017         if (!acpi_debugger.ops) {
1018                 ret = -ENODEV;
1019                 goto err_lock;
1020         }
1021         if (!try_module_get(acpi_debugger.owner)) {
1022                 ret = -ENODEV;
1023                 goto err_lock;
1024         }
1025         func = acpi_debugger.ops->notify_command_complete;
1026         owner = acpi_debugger.owner;
1027         mutex_unlock(&acpi_debugger.lock);
1028
1029         ret = func();
1030
1031         mutex_lock(&acpi_debugger.lock);
1032         module_put(owner);
1033 err_lock:
1034         mutex_unlock(&acpi_debugger.lock);
1035         return ret;
1036 }
1037
1038 int __init acpi_debugger_init(void)
1039 {
1040         mutex_init(&acpi_debugger.lock);
1041         acpi_debugger_initialized = true;
1042         return 0;
1043 }
1044 #endif
1045
1046 /*******************************************************************************
1047  *
1048  * FUNCTION:    acpi_os_execute
1049  *
1050  * PARAMETERS:  Type               - Type of the callback
1051  *              Function           - Function to be executed
1052  *              Context            - Function parameters
1053  *
1054  * RETURN:      Status
1055  *
1056  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1057  *              immediately executes function on a separate thread.
1058  *
1059  ******************************************************************************/
1060
1061 acpi_status acpi_os_execute(acpi_execute_type type,
1062                             acpi_osd_exec_callback function, void *context)
1063 {
1064         acpi_status status = AE_OK;
1065         struct acpi_os_dpc *dpc;
1066         struct workqueue_struct *queue;
1067         int ret;
1068         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1069                           "Scheduling function [%p(%p)] for deferred execution.\n",
1070                           function, context));
1071
1072         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1073                 ret = acpi_debugger_create_thread(function, context);
1074                 if (ret) {
1075                         pr_err("Kernel thread creation failed\n");
1076                         status = AE_ERROR;
1077                 }
1078                 goto out_thread;
1079         }
1080
1081         /*
1082          * Allocate/initialize DPC structure.  Note that this memory will be
1083          * freed by the callee.  The kernel handles the work_struct list  in a
1084          * way that allows us to also free its memory inside the callee.
1085          * Because we may want to schedule several tasks with different
1086          * parameters we can't use the approach some kernel code uses of
1087          * having a static work_struct.
1088          */
1089
1090         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1091         if (!dpc)
1092                 return AE_NO_MEMORY;
1093
1094         dpc->function = function;
1095         dpc->context = context;
1096
1097         /*
1098          * To prevent lockdep from complaining unnecessarily, make sure that
1099          * there is a different static lockdep key for each workqueue by using
1100          * INIT_WORK() for each of them separately.
1101          */
1102         if (type == OSL_NOTIFY_HANDLER) {
1103                 queue = kacpi_notify_wq;
1104                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1105         } else if (type == OSL_GPE_HANDLER) {
1106                 queue = kacpid_wq;
1107                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1108         } else {
1109                 pr_err("Unsupported os_execute type %d.\n", type);
1110                 status = AE_ERROR;
1111         }
1112
1113         if (ACPI_FAILURE(status))
1114                 goto err_workqueue;
1115
1116         /*
1117          * On some machines, a software-initiated SMI causes corruption unless
1118          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1119          * typically it's done in GPE-related methods that are run via
1120          * workqueues, so we can avoid the known corruption cases by always
1121          * queueing on CPU 0.
1122          */
1123         ret = queue_work_on(0, queue, &dpc->work);
1124         if (!ret) {
1125                 pr_err("Unable to queue work\n");
1126                 status = AE_ERROR;
1127         }
1128 err_workqueue:
1129         if (ACPI_FAILURE(status))
1130                 kfree(dpc);
1131 out_thread:
1132         return status;
1133 }
1134 EXPORT_SYMBOL(acpi_os_execute);
1135
1136 void acpi_os_wait_events_complete(void)
1137 {
1138         /*
1139          * Make sure the GPE handler or the fixed event handler is not used
1140          * on another CPU after removal.
1141          */
1142         if (acpi_sci_irq_valid())
1143                 synchronize_hardirq(acpi_sci_irq);
1144         flush_workqueue(kacpid_wq);
1145         flush_workqueue(kacpi_notify_wq);
1146 }
1147 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1148
1149 struct acpi_hp_work {
1150         struct work_struct work;
1151         struct acpi_device *adev;
1152         u32 src;
1153 };
1154
1155 static void acpi_hotplug_work_fn(struct work_struct *work)
1156 {
1157         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1158
1159         acpi_os_wait_events_complete();
1160         acpi_device_hotplug(hpw->adev, hpw->src);
1161         kfree(hpw);
1162 }
1163
1164 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1165 {
1166         struct acpi_hp_work *hpw;
1167
1168         acpi_handle_debug(adev->handle,
1169                           "Scheduling hotplug event %u for deferred handling\n",
1170                            src);
1171
1172         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1173         if (!hpw)
1174                 return AE_NO_MEMORY;
1175
1176         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1177         hpw->adev = adev;
1178         hpw->src = src;
1179         /*
1180          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1181          * the hotplug code may call driver .remove() functions, which may
1182          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1183          * these workqueues.
1184          */
1185         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1186                 kfree(hpw);
1187                 return AE_ERROR;
1188         }
1189         return AE_OK;
1190 }
1191
1192 bool acpi_queue_hotplug_work(struct work_struct *work)
1193 {
1194         return queue_work(kacpi_hotplug_wq, work);
1195 }
1196
1197 acpi_status
1198 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1199 {
1200         struct semaphore *sem = NULL;
1201
1202         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1203         if (!sem)
1204                 return AE_NO_MEMORY;
1205
1206         sema_init(sem, initial_units);
1207
1208         *handle = (acpi_handle *) sem;
1209
1210         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1211                           *handle, initial_units));
1212
1213         return AE_OK;
1214 }
1215
1216 /*
1217  * TODO: A better way to delete semaphores?  Linux doesn't have a
1218  * 'delete_semaphore()' function -- may result in an invalid
1219  * pointer dereference for non-synchronized consumers.  Should
1220  * we at least check for blocked threads and signal/cancel them?
1221  */
1222
1223 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1224 {
1225         struct semaphore *sem = (struct semaphore *)handle;
1226
1227         if (!sem)
1228                 return AE_BAD_PARAMETER;
1229
1230         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1231
1232         BUG_ON(!list_empty(&sem->wait_list));
1233         kfree(sem);
1234         sem = NULL;
1235
1236         return AE_OK;
1237 }
1238
1239 /*
1240  * TODO: Support for units > 1?
1241  */
1242 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1243 {
1244         acpi_status status = AE_OK;
1245         struct semaphore *sem = (struct semaphore *)handle;
1246         long jiffies;
1247         int ret = 0;
1248
1249         if (!acpi_os_initialized)
1250                 return AE_OK;
1251
1252         if (!sem || (units < 1))
1253                 return AE_BAD_PARAMETER;
1254
1255         if (units > 1)
1256                 return AE_SUPPORT;
1257
1258         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1259                           handle, units, timeout));
1260
1261         if (timeout == ACPI_WAIT_FOREVER)
1262                 jiffies = MAX_SCHEDULE_TIMEOUT;
1263         else
1264                 jiffies = msecs_to_jiffies(timeout);
1265
1266         ret = down_timeout(sem, jiffies);
1267         if (ret)
1268                 status = AE_TIME;
1269
1270         if (ACPI_FAILURE(status)) {
1271                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1272                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1273                                   handle, units, timeout,
1274                                   acpi_format_exception(status)));
1275         } else {
1276                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1277                                   "Acquired semaphore[%p|%d|%d]", handle,
1278                                   units, timeout));
1279         }
1280
1281         return status;
1282 }
1283
1284 /*
1285  * TODO: Support for units > 1?
1286  */
1287 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1288 {
1289         struct semaphore *sem = (struct semaphore *)handle;
1290
1291         if (!acpi_os_initialized)
1292                 return AE_OK;
1293
1294         if (!sem || (units < 1))
1295                 return AE_BAD_PARAMETER;
1296
1297         if (units > 1)
1298                 return AE_SUPPORT;
1299
1300         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1301                           units));
1302
1303         up(sem);
1304
1305         return AE_OK;
1306 }
1307
1308 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1309 {
1310 #ifdef ENABLE_DEBUGGER
1311         if (acpi_in_debugger) {
1312                 u32 chars;
1313
1314                 kdb_read(buffer, buffer_length);
1315
1316                 /* remove the CR kdb includes */
1317                 chars = strlen(buffer) - 1;
1318                 buffer[chars] = '\0';
1319         }
1320 #else
1321         int ret;
1322
1323         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1324         if (ret < 0)
1325                 return AE_ERROR;
1326         if (bytes_read)
1327                 *bytes_read = ret;
1328 #endif
1329
1330         return AE_OK;
1331 }
1332 EXPORT_SYMBOL(acpi_os_get_line);
1333
1334 acpi_status acpi_os_wait_command_ready(void)
1335 {
1336         int ret;
1337
1338         ret = acpi_debugger_wait_command_ready();
1339         if (ret < 0)
1340                 return AE_ERROR;
1341         return AE_OK;
1342 }
1343
1344 acpi_status acpi_os_notify_command_complete(void)
1345 {
1346         int ret;
1347
1348         ret = acpi_debugger_notify_command_complete();
1349         if (ret < 0)
1350                 return AE_ERROR;
1351         return AE_OK;
1352 }
1353
1354 acpi_status acpi_os_signal(u32 function, void *info)
1355 {
1356         switch (function) {
1357         case ACPI_SIGNAL_FATAL:
1358                 pr_err("Fatal opcode executed\n");
1359                 break;
1360         case ACPI_SIGNAL_BREAKPOINT:
1361                 /*
1362                  * AML Breakpoint
1363                  * ACPI spec. says to treat it as a NOP unless
1364                  * you are debugging.  So if/when we integrate
1365                  * AML debugger into the kernel debugger its
1366                  * hook will go here.  But until then it is
1367                  * not useful to print anything on breakpoints.
1368                  */
1369                 break;
1370         default:
1371                 break;
1372         }
1373
1374         return AE_OK;
1375 }
1376
1377 static int __init acpi_os_name_setup(char *str)
1378 {
1379         char *p = acpi_os_name;
1380         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1381
1382         if (!str || !*str)
1383                 return 0;
1384
1385         for (; count-- && *str; str++) {
1386                 if (isalnum(*str) || *str == ' ' || *str == ':')
1387                         *p++ = *str;
1388                 else if (*str == '\'' || *str == '"')
1389                         continue;
1390                 else
1391                         break;
1392         }
1393         *p = 0;
1394
1395         return 1;
1396
1397 }
1398
1399 __setup("acpi_os_name=", acpi_os_name_setup);
1400
1401 /*
1402  * Disable the auto-serialization of named objects creation methods.
1403  *
1404  * This feature is enabled by default.  It marks the AML control methods
1405  * that contain the opcodes to create named objects as "Serialized".
1406  */
1407 static int __init acpi_no_auto_serialize_setup(char *str)
1408 {
1409         acpi_gbl_auto_serialize_methods = FALSE;
1410         pr_info("Auto-serialization disabled\n");
1411
1412         return 1;
1413 }
1414
1415 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1416
1417 /* Check of resource interference between native drivers and ACPI
1418  * OperationRegions (SystemIO and System Memory only).
1419  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1420  * in arbitrary AML code and can interfere with legacy drivers.
1421  * acpi_enforce_resources= can be set to:
1422  *
1423  *   - strict (default) (2)
1424  *     -> further driver trying to access the resources will not load
1425  *   - lax              (1)
1426  *     -> further driver trying to access the resources will load, but you
1427  *     get a system message that something might go wrong...
1428  *
1429  *   - no               (0)
1430  *     -> ACPI Operation Region resources will not be registered
1431  *
1432  */
1433 #define ENFORCE_RESOURCES_STRICT 2
1434 #define ENFORCE_RESOURCES_LAX    1
1435 #define ENFORCE_RESOURCES_NO     0
1436
1437 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1438
1439 static int __init acpi_enforce_resources_setup(char *str)
1440 {
1441         if (str == NULL || *str == '\0')
1442                 return 0;
1443
1444         if (!strcmp("strict", str))
1445                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1446         else if (!strcmp("lax", str))
1447                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1448         else if (!strcmp("no", str))
1449                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1450
1451         return 1;
1452 }
1453
1454 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1455
1456 /* Check for resource conflicts between ACPI OperationRegions and native
1457  * drivers */
1458 int acpi_check_resource_conflict(const struct resource *res)
1459 {
1460         acpi_adr_space_type space_id;
1461
1462         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1463                 return 0;
1464
1465         if (res->flags & IORESOURCE_IO)
1466                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1467         else if (res->flags & IORESOURCE_MEM)
1468                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1469         else
1470                 return 0;
1471
1472         if (!acpi_check_address_range(space_id, res->start, resource_size(res), 1))
1473                 return 0;
1474
1475         pr_info("Resource conflict; ACPI support missing from driver?\n");
1476
1477         if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1478                 return -EBUSY;
1479
1480         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1481                 pr_notice("Resource conflict: System may be unstable or behave erratically\n");
1482
1483         return 0;
1484 }
1485 EXPORT_SYMBOL(acpi_check_resource_conflict);
1486
1487 int acpi_check_region(resource_size_t start, resource_size_t n,
1488                       const char *name)
1489 {
1490         struct resource res = {
1491                 .start = start,
1492                 .end   = start + n - 1,
1493                 .name  = name,
1494                 .flags = IORESOURCE_IO,
1495         };
1496
1497         return acpi_check_resource_conflict(&res);
1498 }
1499 EXPORT_SYMBOL(acpi_check_region);
1500
1501 static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1502                                               void *_res, void **return_value)
1503 {
1504         struct acpi_mem_space_context **mem_ctx;
1505         union acpi_operand_object *handler_obj;
1506         union acpi_operand_object *region_obj2;
1507         union acpi_operand_object *region_obj;
1508         struct resource *res = _res;
1509         acpi_status status;
1510
1511         region_obj = acpi_ns_get_attached_object(handle);
1512         if (!region_obj)
1513                 return AE_OK;
1514
1515         handler_obj = region_obj->region.handler;
1516         if (!handler_obj)
1517                 return AE_OK;
1518
1519         if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1520                 return AE_OK;
1521
1522         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1523                 return AE_OK;
1524
1525         region_obj2 = acpi_ns_get_secondary_object(region_obj);
1526         if (!region_obj2)
1527                 return AE_OK;
1528
1529         mem_ctx = (void *)&region_obj2->extra.region_context;
1530
1531         if (!(mem_ctx[0]->address >= res->start &&
1532               mem_ctx[0]->address < res->end))
1533                 return AE_OK;
1534
1535         status = handler_obj->address_space.setup(region_obj,
1536                                                   ACPI_REGION_DEACTIVATE,
1537                                                   NULL, (void **)mem_ctx);
1538         if (ACPI_SUCCESS(status))
1539                 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1540
1541         return status;
1542 }
1543
1544 /**
1545  * acpi_release_memory - Release any mappings done to a memory region
1546  * @handle: Handle to namespace node
1547  * @res: Memory resource
1548  * @level: A level that terminates the search
1549  *
1550  * Walks through @handle and unmaps all SystemMemory Operation Regions that
1551  * overlap with @res and that have already been activated (mapped).
1552  *
1553  * This is a helper that allows drivers to place special requirements on memory
1554  * region that may overlap with operation regions, primarily allowing them to
1555  * safely map the region as non-cached memory.
1556  *
1557  * The unmapped Operation Regions will be automatically remapped next time they
1558  * are called, so the drivers do not need to do anything else.
1559  */
1560 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1561                                 u32 level)
1562 {
1563         acpi_status status;
1564
1565         if (!(res->flags & IORESOURCE_MEM))
1566                 return AE_TYPE;
1567
1568         status = acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1569                                      acpi_deactivate_mem_region, NULL,
1570                                      res, NULL);
1571         if (ACPI_FAILURE(status))
1572                 return status;
1573
1574         /*
1575          * Wait for all of the mappings queued up for removal by
1576          * acpi_deactivate_mem_region() to actually go away.
1577          */
1578         synchronize_rcu();
1579         rcu_barrier();
1580         flush_scheduled_work();
1581
1582         return AE_OK;
1583 }
1584 EXPORT_SYMBOL_GPL(acpi_release_memory);
1585
1586 /*
1587  * Let drivers know whether the resource checks are effective
1588  */
1589 int acpi_resources_are_enforced(void)
1590 {
1591         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1592 }
1593 EXPORT_SYMBOL(acpi_resources_are_enforced);
1594
1595 /*
1596  * Deallocate the memory for a spinlock.
1597  */
1598 void acpi_os_delete_lock(acpi_spinlock handle)
1599 {
1600         ACPI_FREE(handle);
1601 }
1602
1603 /*
1604  * Acquire a spinlock.
1605  *
1606  * handle is a pointer to the spinlock_t.
1607  */
1608
1609 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1610         __acquires(lockp)
1611 {
1612         acpi_cpu_flags flags;
1613         spin_lock_irqsave(lockp, flags);
1614         return flags;
1615 }
1616
1617 /*
1618  * Release a spinlock. See above.
1619  */
1620
1621 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1622         __releases(lockp)
1623 {
1624         spin_unlock_irqrestore(lockp, flags);
1625 }
1626
1627 #ifndef ACPI_USE_LOCAL_CACHE
1628
1629 /*******************************************************************************
1630  *
1631  * FUNCTION:    acpi_os_create_cache
1632  *
1633  * PARAMETERS:  name      - Ascii name for the cache
1634  *              size      - Size of each cached object
1635  *              depth     - Maximum depth of the cache (in objects) <ignored>
1636  *              cache     - Where the new cache object is returned
1637  *
1638  * RETURN:      status
1639  *
1640  * DESCRIPTION: Create a cache object
1641  *
1642  ******************************************************************************/
1643
1644 acpi_status
1645 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1646 {
1647         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1648         if (*cache == NULL)
1649                 return AE_ERROR;
1650         else
1651                 return AE_OK;
1652 }
1653
1654 /*******************************************************************************
1655  *
1656  * FUNCTION:    acpi_os_purge_cache
1657  *
1658  * PARAMETERS:  Cache           - Handle to cache object
1659  *
1660  * RETURN:      Status
1661  *
1662  * DESCRIPTION: Free all objects within the requested cache.
1663  *
1664  ******************************************************************************/
1665
1666 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1667 {
1668         kmem_cache_shrink(cache);
1669         return (AE_OK);
1670 }
1671
1672 /*******************************************************************************
1673  *
1674  * FUNCTION:    acpi_os_delete_cache
1675  *
1676  * PARAMETERS:  Cache           - Handle to cache object
1677  *
1678  * RETURN:      Status
1679  *
1680  * DESCRIPTION: Free all objects within the requested cache and delete the
1681  *              cache object.
1682  *
1683  ******************************************************************************/
1684
1685 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1686 {
1687         kmem_cache_destroy(cache);
1688         return (AE_OK);
1689 }
1690
1691 /*******************************************************************************
1692  *
1693  * FUNCTION:    acpi_os_release_object
1694  *
1695  * PARAMETERS:  Cache       - Handle to cache object
1696  *              Object      - The object to be released
1697  *
1698  * RETURN:      None
1699  *
1700  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1701  *              the object is deleted.
1702  *
1703  ******************************************************************************/
1704
1705 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1706 {
1707         kmem_cache_free(cache, object);
1708         return (AE_OK);
1709 }
1710 #endif
1711
1712 static int __init acpi_no_static_ssdt_setup(char *s)
1713 {
1714         acpi_gbl_disable_ssdt_table_install = TRUE;
1715         pr_info("Static SSDT installation disabled\n");
1716
1717         return 0;
1718 }
1719
1720 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1721
1722 static int __init acpi_disable_return_repair(char *s)
1723 {
1724         pr_notice("Predefined validation mechanism disabled\n");
1725         acpi_gbl_disable_auto_repair = TRUE;
1726
1727         return 1;
1728 }
1729
1730 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1731
1732 acpi_status __init acpi_os_initialize(void)
1733 {
1734         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1735         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1736
1737         acpi_gbl_xgpe0_block_logical_address =
1738                 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1739         acpi_gbl_xgpe1_block_logical_address =
1740                 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1741
1742         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1743                 /*
1744                  * Use acpi_os_map_generic_address to pre-map the reset
1745                  * register if it's in system memory.
1746                  */
1747                 void *rv;
1748
1749                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1750                 pr_debug("%s: Reset register mapping %s\n", __func__,
1751                          rv ? "successful" : "failed");
1752         }
1753         acpi_os_initialized = true;
1754
1755         return AE_OK;
1756 }
1757
1758 acpi_status __init acpi_os_initialize1(void)
1759 {
1760         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1761         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1762         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1763         BUG_ON(!kacpid_wq);
1764         BUG_ON(!kacpi_notify_wq);
1765         BUG_ON(!kacpi_hotplug_wq);
1766         acpi_osi_init();
1767         return AE_OK;
1768 }
1769
1770 acpi_status acpi_os_terminate(void)
1771 {
1772         if (acpi_irq_handler) {
1773                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1774                                                  acpi_irq_handler);
1775         }
1776
1777         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1778         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1779         acpi_gbl_xgpe0_block_logical_address = 0UL;
1780         acpi_gbl_xgpe1_block_logical_address = 0UL;
1781
1782         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1783         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1784
1785         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1786                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1787
1788         destroy_workqueue(kacpid_wq);
1789         destroy_workqueue(kacpi_notify_wq);
1790         destroy_workqueue(kacpi_hotplug_wq);
1791
1792         return AE_OK;
1793 }
1794
1795 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1796                                   u32 pm1b_control)
1797 {
1798         int rc = 0;
1799         if (__acpi_os_prepare_sleep)
1800                 rc = __acpi_os_prepare_sleep(sleep_state,
1801                                              pm1a_control, pm1b_control);
1802         if (rc < 0)
1803                 return AE_ERROR;
1804         else if (rc > 0)
1805                 return AE_CTRL_TERMINATE;
1806
1807         return AE_OK;
1808 }
1809
1810 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1811                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1812 {
1813         __acpi_os_prepare_sleep = func;
1814 }
1815
1816 #if (ACPI_REDUCED_HARDWARE)
1817 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1818                                   u32 val_b)
1819 {
1820         int rc = 0;
1821         if (__acpi_os_prepare_extended_sleep)
1822                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1823                                              val_a, val_b);
1824         if (rc < 0)
1825                 return AE_ERROR;
1826         else if (rc > 0)
1827                 return AE_CTRL_TERMINATE;
1828
1829         return AE_OK;
1830 }
1831 #else
1832 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1833                                   u32 val_b)
1834 {
1835         return AE_OK;
1836 }
1837 #endif
1838
1839 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1840                                u32 val_a, u32 val_b))
1841 {
1842         __acpi_os_prepare_extended_sleep = func;
1843 }
1844
1845 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1846                                 u32 reg_a_value, u32 reg_b_value)
1847 {
1848         acpi_status status;
1849
1850         if (acpi_gbl_reduced_hardware)
1851                 status = acpi_os_prepare_extended_sleep(sleep_state,
1852                                                         reg_a_value,
1853                                                         reg_b_value);
1854         else
1855                 status = acpi_os_prepare_sleep(sleep_state,
1856                                                reg_a_value, reg_b_value);
1857         return status;
1858 }