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