drivers/acpi/osl.c

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