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