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