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