drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <[email protected]>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pci.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kmod.h>
  34 #include <linux/delay.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/nmi.h>
  37 #include <linux/acpi.h>
  38 #include <linux/efi.h>
  39 #include <linux/ioport.h>
  40 #include <linux/list.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/semaphore.h>
  43
  44 #include <asm/io.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/io-64-nonatomic-lo-hi.h>
  47
  48 #include "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;
 193
 194 #ifdef CONFIG_KEXEC
 195         if (acpi_rsdp)
 196                 return acpi_rsdp;
 197 #endif
 198         pa = acpi_arch_get_root_pointer();
 199         if (pa)
 200                 return pa;
 201
 202         if (efi_enabled(EFI_CONFIG_TABLES)) {
 203                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 204                         return efi.acpi20;
 205                 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 206                         return efi.acpi;
 207                 pr_err(PREFIX "System description tables not found\n");
 208         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 209                 acpi_find_root_pointer(&pa);
 210         }
 211
 212         return pa;
 213 }
 214
 215 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 216 static struct acpi_ioremap *
 217 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 218 {
 219         struct acpi_ioremap *map;
 220
 221         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 222                 if (map->phys <= phys &&
 223                     phys + size <= map->phys + map->size)
 224                         return map;
 225
 226         return NULL;
 227 }
 228
 229 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 230 static void __iomem *
 231 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 232 {
 233         struct acpi_ioremap *map;
 234
 235         map = acpi_map_lookup(phys, size);
 236         if (map)
 237                 return map->virt + (phys - map->phys);
 238
 239         return NULL;
 240 }
 241
 242 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 243 {
 244         struct acpi_ioremap *map;
 245         void __iomem *virt = NULL;
 246
 247         mutex_lock(&acpi_ioremap_lock);
 248         map = acpi_map_lookup(phys, size);
 249         if (map) {
 250                 virt = map->virt + (phys - map->phys);
 251                 map->refcount++;
 252         }
 253         mutex_unlock(&acpi_ioremap_lock);
 254         return virt;
 255 }
 256 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 257
 258 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 259 static struct acpi_ioremap *
 260 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 261 {
 262         struct acpi_ioremap *map;
 263
 264         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 265                 if (map->virt <= virt &&
 266                     virt + size <= map->virt + map->size)
 267                         return map;
 268
 269         return NULL;
 270 }
 271
 272 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 273 /* ioremap will take care of cache attributes */
 274 #define should_use_kmap(pfn)   0
 275 #else
 276 #define should_use_kmap(pfn)   page_is_ram(pfn)
 277 #endif
 278
 279 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 280 {
 281         unsigned long pfn;
 282
 283         pfn = pg_off >> PAGE_SHIFT;
 284         if (should_use_kmap(pfn)) {
 285                 if (pg_sz > PAGE_SIZE)
 286                         return NULL;
 287                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 288         } else
 289                 return acpi_os_ioremap(pg_off, pg_sz);
 290 }
 291
 292 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 293 {
 294         unsigned long pfn;
 295
 296         pfn = pg_off >> PAGE_SHIFT;
 297         if (should_use_kmap(pfn))
 298                 kunmap(pfn_to_page(pfn));
 299         else
 300                 iounmap(vaddr);
 301 }
 302
 303 /**
 304  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 305  * @phys: Start of the physical address range to map.
 306  * @size: Size of the physical address range to map.
 307  *
 308  * Look up the given physical address range in the list of existing ACPI memory
 309  * mappings.  If found, get a reference to it and return a pointer to it (its
 310  * virtual address).  If not found, map it, add it to that list and return a
 311  * pointer to it.
 312  *
 313  * During early init (when acpi_permanent_mmap has not been set yet) this
 314  * routine simply calls __acpi_map_table() to get the job done.
 315  */
 316 void __iomem *__ref
 317 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 318 {
 319         struct acpi_ioremap *map;
 320         void __iomem *virt;
 321         acpi_physical_address pg_off;
 322         acpi_size pg_sz;
 323
 324         if (phys > ULONG_MAX) {
 325                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 326                 return NULL;
 327         }
 328
 329         if (!acpi_permanent_mmap)
 330                 return __acpi_map_table((unsigned long)phys, size);
 331
 332         mutex_lock(&acpi_ioremap_lock);
 333         /* Check if there's a suitable mapping already. */
 334         map = acpi_map_lookup(phys, size);
 335         if (map) {
 336                 map->refcount++;
 337                 goto out;
 338         }
 339
 340         map = kzalloc(sizeof(*map), GFP_KERNEL);
 341         if (!map) {
 342                 mutex_unlock(&acpi_ioremap_lock);
 343                 return NULL;
 344         }
 345
 346         pg_off = round_down(phys, PAGE_SIZE);
 347         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 348         virt = acpi_map(pg_off, pg_sz);
 349         if (!virt) {
 350                 mutex_unlock(&acpi_ioremap_lock);
 351                 kfree(map);
 352                 return NULL;
 353         }
 354
 355         INIT_LIST_HEAD(&map->list);
 356         map->virt = virt;
 357         map->phys = pg_off;
 358         map->size = pg_sz;
 359         map->refcount = 1;
 360
 361         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 362
 363 out:
 364         mutex_unlock(&acpi_ioremap_lock);
 365         return map->virt + (phys - map->phys);
 366 }
 367 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 368
 369 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 370 {
 371         return (void *)acpi_os_map_iomem(phys, size);
 372 }
 373 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 374
 375 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 376 {
 377         if (!--map->refcount)
 378                 list_del_rcu(&map->list);
 379 }
 380
 381 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 382 {
 383         if (!map->refcount) {
 384                 synchronize_rcu_expedited();
 385                 acpi_unmap(map->phys, map->virt);
 386                 kfree(map);
 387         }
 388 }
 389
 390 /**
 391  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 392  * @virt: Start of the address range to drop a reference to.
 393  * @size: Size of the address range to drop a reference to.
 394  *
 395  * Look up the given virtual address range in the list of existing ACPI memory
 396  * mappings, drop a reference to it and unmap it if there are no more active
 397  * references to it.
 398  *
 399  * During early init (when acpi_permanent_mmap has not been set yet) this
 400  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 401  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 402  * here.
 403  */
 404 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 405 {
 406         struct acpi_ioremap *map;
 407
 408         if (!acpi_permanent_mmap) {
 409                 __acpi_unmap_table(virt, size);
 410                 return;
 411         }
 412
 413         mutex_lock(&acpi_ioremap_lock);
 414         map = acpi_map_lookup_virt(virt, size);
 415         if (!map) {
 416                 mutex_unlock(&acpi_ioremap_lock);
 417                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 418                 return;
 419         }
 420         acpi_os_drop_map_ref(map);
 421         mutex_unlock(&acpi_ioremap_lock);
 422
 423         acpi_os_map_cleanup(map);
 424 }
 425 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 426
 427 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 428 {
 429         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 430 }
 431 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 432
 433 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 434 {
 435         u64 addr;
 436         void __iomem *virt;
 437
 438         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 439                 return 0;
 440
 441         /* Handle possible alignment issues */
 442         memcpy(&addr, &gas->address, sizeof(addr));
 443         if (!addr || !gas->bit_width)
 444                 return -EINVAL;
 445
 446         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 447         if (!virt)
 448                 return -EIO;
 449
 450         return 0;
 451 }
 452 EXPORT_SYMBOL(acpi_os_map_generic_address);
 453
 454 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 455 {
 456         u64 addr;
 457         struct acpi_ioremap *map;
 458
 459         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 460                 return;
 461
 462         /* Handle possible alignment issues */
 463         memcpy(&addr, &gas->address, sizeof(addr));
 464         if (!addr || !gas->bit_width)
 465                 return;
 466
 467         mutex_lock(&acpi_ioremap_lock);
 468         map = acpi_map_lookup(addr, gas->bit_width / 8);
 469         if (!map) {
 470                 mutex_unlock(&acpi_ioremap_lock);
 471                 return;
 472         }
 473         acpi_os_drop_map_ref(map);
 474         mutex_unlock(&acpi_ioremap_lock);
 475
 476         acpi_os_map_cleanup(map);
 477 }
 478 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 479
 480 #ifdef ACPI_FUTURE_USAGE
 481 acpi_status
 482 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 483 {
 484         if (!phys || !virt)
 485                 return AE_BAD_PARAMETER;
 486
 487         *phys = virt_to_phys(virt);
 488
 489         return AE_OK;
 490 }
 491 #endif
 492
 493 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 494 static bool acpi_rev_override;
 495
 496 int __init acpi_rev_override_setup(char *str)
 497 {
 498         acpi_rev_override = true;
 499         return 1;
 500 }
 501 __setup("acpi_rev_override", acpi_rev_override_setup);
 502 #else
 503 #define acpi_rev_override       false
 504 #endif
 505
 506 #define ACPI_MAX_OVERRIDE_LEN 100
 507
 508 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 509
 510 acpi_status
 511 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 512                             acpi_string *new_val)
 513 {
 514         if (!init_val || !new_val)
 515                 return AE_BAD_PARAMETER;
 516
 517         *new_val = NULL;
 518         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 519                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 520                        acpi_os_name);
 521                 *new_val = acpi_os_name;
 522         }
 523
 524         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 525                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 526                 *new_val = (char *)5;
 527         }
 528
 529         return AE_OK;
 530 }
 531
 532 static irqreturn_t acpi_irq(int irq, void *dev_id)
 533 {
 534         u32 handled;
 535
 536         handled = (*acpi_irq_handler) (acpi_irq_context);
 537
 538         if (handled) {
 539                 acpi_irq_handled++;
 540                 return IRQ_HANDLED;
 541         } else {
 542                 acpi_irq_not_handled++;
 543                 return IRQ_NONE;
 544         }
 545 }
 546
 547 acpi_status
 548 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 549                                   void *context)
 550 {
 551         unsigned int irq;
 552
 553         acpi_irq_stats_init();
 554
 555         /*
 556          * ACPI interrupts different from the SCI in our copy of the FADT are
 557          * not supported.
 558          */
 559         if (gsi != acpi_gbl_FADT.sci_interrupt)
 560                 return AE_BAD_PARAMETER;
 561
 562         if (acpi_irq_handler)
 563                 return AE_ALREADY_ACQUIRED;
 564
 565         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 566                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 567                        gsi);
 568                 return AE_OK;
 569         }
 570
 571         acpi_irq_handler = handler;
 572         acpi_irq_context = context;
 573         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 574                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 575                 acpi_irq_handler = NULL;
 576                 return AE_NOT_ACQUIRED;
 577         }
 578         acpi_sci_irq = irq;
 579
 580         return AE_OK;
 581 }
 582
 583 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 584 {
 585         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 586                 return AE_BAD_PARAMETER;
 587
 588         free_irq(acpi_sci_irq, acpi_irq);
 589         acpi_irq_handler = NULL;
 590         acpi_sci_irq = INVALID_ACPI_IRQ;
 591
 592         return AE_OK;
 593 }
 594
 595 /*
 596  * Running in interpreter thread context, safe to sleep
 597  */
 598
 599 void acpi_os_sleep(u64 ms)
 600 {
 601         msleep(ms);
 602 }
 603
 604 void acpi_os_stall(u32 us)
 605 {
 606         while (us) {
 607                 u32 delay = 1000;
 608
 609                 if (delay > us)
 610                         delay = us;
 611                 udelay(delay);
 612                 touch_nmi_watchdog();
 613                 us -= delay;
 614         }
 615 }
 616
 617 /*
 618  * Support ACPI 3.0 AML Timer operand
 619  * Returns 64-bit free-running, monotonically increasing timer
 620  * with 100ns granularity
 621  */
 622 u64 acpi_os_get_timer(void)
 623 {
 624         u64 time_ns = ktime_to_ns(ktime_get());
 625         do_div(time_ns, 100);
 626         return time_ns;
 627 }
 628
 629 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 630 {
 631         u32 dummy;
 632
 633         if (!value)
 634                 value = &dummy;
 635
 636         *value = 0;
 637         if (width <= 8) {
 638                 *(u8 *) value = inb(port);
 639         } else if (width <= 16) {
 640                 *(u16 *) value = inw(port);
 641         } else if (width <= 32) {
 642                 *(u32 *) value = inl(port);
 643         } else {
 644                 BUG();
 645         }
 646
 647         return AE_OK;
 648 }
 649
 650 EXPORT_SYMBOL(acpi_os_read_port);
 651
 652 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 653 {
 654         if (width <= 8) {
 655                 outb(value, port);
 656         } else if (width <= 16) {
 657                 outw(value, port);
 658         } else if (width <= 32) {
 659                 outl(value, port);
 660         } else {
 661                 BUG();
 662         }
 663
 664         return AE_OK;
 665 }
 666
 667 EXPORT_SYMBOL(acpi_os_write_port);
 668
 669 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 670 {
 671
 672         switch (width) {
 673         case 8:
 674                 *(u8 *) value = readb(virt_addr);
 675                 break;
 676         case 16:
 677                 *(u16 *) value = readw(virt_addr);
 678                 break;
 679         case 32:
 680                 *(u32 *) value = readl(virt_addr);
 681                 break;
 682         case 64:
 683                 *(u64 *) value = readq(virt_addr);
 684                 break;
 685         default:
 686                 return -EINVAL;
 687         }
 688
 689         return 0;
 690 }
 691
 692 acpi_status
 693 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 694 {
 695         void __iomem *virt_addr;
 696         unsigned int size = width / 8;
 697         bool unmap = false;
 698         u64 dummy;
 699         int error;
 700
 701         rcu_read_lock();
 702         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 703         if (!virt_addr) {
 704                 rcu_read_unlock();
 705                 virt_addr = acpi_os_ioremap(phys_addr, size);
 706                 if (!virt_addr)
 707                         return AE_BAD_ADDRESS;
 708                 unmap = true;
 709         }
 710
 711         if (!value)
 712                 value = &dummy;
 713
 714         error = acpi_os_read_iomem(virt_addr, value, width);
 715         BUG_ON(error);
 716
 717         if (unmap)
 718                 iounmap(virt_addr);
 719         else
 720                 rcu_read_unlock();
 721
 722         return AE_OK;
 723 }
 724
 725 acpi_status
 726 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 727 {
 728         void __iomem *virt_addr;
 729         unsigned int size = width / 8;
 730         bool unmap = false;
 731
 732         rcu_read_lock();
 733         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 734         if (!virt_addr) {
 735                 rcu_read_unlock();
 736                 virt_addr = acpi_os_ioremap(phys_addr, size);
 737                 if (!virt_addr)
 738                         return AE_BAD_ADDRESS;
 739                 unmap = true;
 740         }
 741
 742         switch (width) {
 743         case 8:
 744                 writeb(value, virt_addr);
 745                 break;
 746         case 16:
 747                 writew(value, virt_addr);
 748                 break;
 749         case 32:
 750                 writel(value, virt_addr);
 751                 break;
 752         case 64:
 753                 writeq(value, virt_addr);
 754                 break;
 755         default:
 756                 BUG();
 757         }
 758
 759         if (unmap)
 760                 iounmap(virt_addr);
 761         else
 762                 rcu_read_unlock();
 763
 764         return AE_OK;
 765 }
 766
 767 acpi_status
 768 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 769                                u64 *value, u32 width)
 770 {
 771         int result, size;
 772         u32 value32;
 773
 774         if (!value)
 775                 return AE_BAD_PARAMETER;
 776
 777         switch (width) {
 778         case 8:
 779                 size = 1;
 780                 break;
 781         case 16:
 782                 size = 2;
 783                 break;
 784         case 32:
 785                 size = 4;
 786                 break;
 787         default:
 788                 return AE_ERROR;
 789         }
 790
 791         result = raw_pci_read(pci_id->segment, pci_id->bus,
 792                                 PCI_DEVFN(pci_id->device, pci_id->function),
 793                                 reg, size, &value32);
 794         *value = value32;
 795
 796         return (result ? AE_ERROR : AE_OK);
 797 }
 798
 799 acpi_status
 800 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 801                                 u64 value, u32 width)
 802 {
 803         int result, size;
 804
 805         switch (width) {
 806         case 8:
 807                 size = 1;
 808                 break;
 809         case 16:
 810                 size = 2;
 811                 break;
 812         case 32:
 813                 size = 4;
 814                 break;
 815         default:
 816                 return AE_ERROR;
 817         }
 818
 819         result = raw_pci_write(pci_id->segment, pci_id->bus,
 820                                 PCI_DEVFN(pci_id->device, pci_id->function),
 821                                 reg, size, value);
 822
 823         return (result ? AE_ERROR : AE_OK);
 824 }
 825
 826 static void acpi_os_execute_deferred(struct work_struct *work)
 827 {
 828         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 829
 830         dpc->function(dpc->context);
 831         kfree(dpc);
 832 }
 833
 834 #ifdef CONFIG_ACPI_DEBUGGER
 835 static struct acpi_debugger acpi_debugger;
 836 static bool acpi_debugger_initialized;
 837
 838 int acpi_register_debugger(struct module *owner,
 839                            const struct acpi_debugger_ops *ops)
 840 {
 841         int ret = 0;
 842
 843         mutex_lock(&acpi_debugger.lock);
 844         if (acpi_debugger.ops) {
 845                 ret = -EBUSY;
 846                 goto err_lock;
 847         }
 848
 849         acpi_debugger.owner = owner;
 850         acpi_debugger.ops = ops;
 851
 852 err_lock:
 853         mutex_unlock(&acpi_debugger.lock);
 854         return ret;
 855 }
 856 EXPORT_SYMBOL(acpi_register_debugger);
 857
 858 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 859 {
 860         mutex_lock(&acpi_debugger.lock);
 861         if (ops == acpi_debugger.ops) {
 862                 acpi_debugger.ops = NULL;
 863                 acpi_debugger.owner = NULL;
 864         }
 865         mutex_unlock(&acpi_debugger.lock);
 866 }
 867 EXPORT_SYMBOL(acpi_unregister_debugger);
 868
 869 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 870 {
 871         int ret;
 872         int (*func)(acpi_osd_exec_callback, void *);
 873         struct module *owner;
 874
 875         if (!acpi_debugger_initialized)
 876                 return -ENODEV;
 877         mutex_lock(&acpi_debugger.lock);
 878         if (!acpi_debugger.ops) {
 879                 ret = -ENODEV;
 880                 goto err_lock;
 881         }
 882         if (!try_module_get(acpi_debugger.owner)) {
 883                 ret = -ENODEV;
 884                 goto err_lock;
 885         }
 886         func = acpi_debugger.ops->create_thread;
 887         owner = acpi_debugger.owner;
 888         mutex_unlock(&acpi_debugger.lock);
 889
 890         ret = func(function, context);
 891
 892         mutex_lock(&acpi_debugger.lock);
 893         module_put(owner);
 894 err_lock:
 895         mutex_unlock(&acpi_debugger.lock);
 896         return ret;
 897 }
 898
 899 ssize_t acpi_debugger_write_log(const char *msg)
 900 {
 901         ssize_t ret;
 902         ssize_t (*func)(const char *);
 903         struct module *owner;
 904
 905         if (!acpi_debugger_initialized)
 906                 return -ENODEV;
 907         mutex_lock(&acpi_debugger.lock);
 908         if (!acpi_debugger.ops) {
 909                 ret = -ENODEV;
 910                 goto err_lock;
 911         }
 912         if (!try_module_get(acpi_debugger.owner)) {
 913                 ret = -ENODEV;
 914                 goto err_lock;
 915         }
 916         func = acpi_debugger.ops->write_log;
 917         owner = acpi_debugger.owner;
 918         mutex_unlock(&acpi_debugger.lock);
 919
 920         ret = func(msg);
 921
 922         mutex_lock(&acpi_debugger.lock);
 923         module_put(owner);
 924 err_lock:
 925         mutex_unlock(&acpi_debugger.lock);
 926         return ret;
 927 }
 928
 929 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 930 {
 931         ssize_t ret;
 932         ssize_t (*func)(char *, size_t);
 933         struct module *owner;
 934
 935         if (!acpi_debugger_initialized)
 936                 return -ENODEV;
 937         mutex_lock(&acpi_debugger.lock);
 938         if (!acpi_debugger.ops) {
 939                 ret = -ENODEV;
 940                 goto err_lock;
 941         }
 942         if (!try_module_get(acpi_debugger.owner)) {
 943                 ret = -ENODEV;
 944                 goto err_lock;
 945         }
 946         func = acpi_debugger.ops->read_cmd;
 947         owner = acpi_debugger.owner;
 948         mutex_unlock(&acpi_debugger.lock);
 949
 950         ret = func(buffer, buffer_length);
 951
 952         mutex_lock(&acpi_debugger.lock);
 953         module_put(owner);
 954 err_lock:
 955         mutex_unlock(&acpi_debugger.lock);
 956         return ret;
 957 }
 958
 959 int acpi_debugger_wait_command_ready(void)
 960 {
 961         int ret;
 962         int (*func)(bool, char *, size_t);
 963         struct module *owner;
 964
 965         if (!acpi_debugger_initialized)
 966                 return -ENODEV;
 967         mutex_lock(&acpi_debugger.lock);
 968         if (!acpi_debugger.ops) {
 969                 ret = -ENODEV;
 970                 goto err_lock;
 971         }
 972         if (!try_module_get(acpi_debugger.owner)) {
 973                 ret = -ENODEV;
 974                 goto err_lock;
 975         }
 976         func = acpi_debugger.ops->wait_command_ready;
 977         owner = acpi_debugger.owner;
 978         mutex_unlock(&acpi_debugger.lock);
 979
 980         ret = func(acpi_gbl_method_executing,
 981                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
 982
 983         mutex_lock(&acpi_debugger.lock);
 984         module_put(owner);
 985 err_lock:
 986         mutex_unlock(&acpi_debugger.lock);
 987         return ret;
 988 }
 989
 990 int acpi_debugger_notify_command_complete(void)
 991 {
 992         int ret;
 993         int (*func)(void);
 994         struct module *owner;
 995
 996         if (!acpi_debugger_initialized)
 997                 return -ENODEV;
 998         mutex_lock(&acpi_debugger.lock);
 999         if (!acpi_debugger.ops) {
1000                 ret = -ENODEV;
1001                 goto err_lock;
1002         }
1003         if (!try_module_get(acpi_debugger.owner)) {
1004                 ret = -ENODEV;
1005                 goto err_lock;
1006         }
1007         func = acpi_debugger.ops->notify_command_complete;
1008         owner = acpi_debugger.owner;
1009         mutex_unlock(&acpi_debugger.lock);
1010
1011         ret = func();
1012
1013         mutex_lock(&acpi_debugger.lock);
1014         module_put(owner);
1015 err_lock:
1016         mutex_unlock(&acpi_debugger.lock);
1017         return ret;
1018 }
1019
1020 int __init acpi_debugger_init(void)
1021 {
1022         mutex_init(&acpi_debugger.lock);
1023         acpi_debugger_initialized = true;
1024         return 0;
1025 }
1026 #endif
1027
1028 /*******************************************************************************
1029  *
1030  * FUNCTION:    acpi_os_execute
1031  *
1032  * PARAMETERS:  Type               - Type of the callback
1033  *              Function           - Function to be executed
1034  *              Context            - Function parameters
1035  *
1036  * RETURN:      Status
1037  *
1038  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1039  *              immediately executes function on a separate thread.
1040  *
1041  ******************************************************************************/
1042
1043 acpi_status acpi_os_execute(acpi_execute_type type,
1044                             acpi_osd_exec_callback function, void *context)
1045 {
1046         acpi_status status = AE_OK;
1047         struct acpi_os_dpc *dpc;
1048         struct workqueue_struct *queue;
1049         int ret;
1050         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1051                           "Scheduling function [%p(%p)] for deferred execution.\n",
1052                           function, context));
1053
1054         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1055                 ret = acpi_debugger_create_thread(function, context);
1056                 if (ret) {
1057                         pr_err("Call to kthread_create() failed.\n");
1058                         status = AE_ERROR;
1059                 }
1060                 goto out_thread;
1061         }
1062
1063         /*
1064          * Allocate/initialize DPC structure.  Note that this memory will be
1065          * freed by the callee.  The kernel handles the work_struct list  in a
1066          * way that allows us to also free its memory inside the callee.
1067          * Because we may want to schedule several tasks with different
1068          * parameters we can't use the approach some kernel code uses of
1069          * having a static work_struct.
1070          */
1071
1072         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1073         if (!dpc)
1074                 return AE_NO_MEMORY;
1075
1076         dpc->function = function;
1077         dpc->context = context;
1078
1079         /*
1080          * To prevent lockdep from complaining unnecessarily, make sure that
1081          * there is a different static lockdep key for each workqueue by using
1082          * INIT_WORK() for each of them separately.
1083          */
1084         if (type == OSL_NOTIFY_HANDLER) {
1085                 queue = kacpi_notify_wq;
1086                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1087         } else if (type == OSL_GPE_HANDLER) {
1088                 queue = kacpid_wq;
1089                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1090         } else {
1091                 pr_err("Unsupported os_execute type %d.\n", type);
1092                 status = AE_ERROR;
1093         }
1094
1095         if (ACPI_FAILURE(status))
1096                 goto err_workqueue;
1097
1098         /*
1099          * On some machines, a software-initiated SMI causes corruption unless
1100          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1101          * typically it's done in GPE-related methods that are run via
1102          * workqueues, so we can avoid the known corruption cases by always
1103          * queueing on CPU 0.
1104          */
1105         ret = queue_work_on(0, queue, &dpc->work);
1106         if (!ret) {
1107                 printk(KERN_ERR PREFIX
1108                           "Call to queue_work() failed.\n");
1109                 status = AE_ERROR;
1110         }
1111 err_workqueue:
1112         if (ACPI_FAILURE(status))
1113                 kfree(dpc);
1114 out_thread:
1115         return status;
1116 }
1117 EXPORT_SYMBOL(acpi_os_execute);
1118
1119 void acpi_os_wait_events_complete(void)
1120 {
1121         /*
1122          * Make sure the GPE handler or the fixed event handler is not used
1123          * on another CPU after removal.
1124          */
1125         if (acpi_sci_irq_valid())
1126                 synchronize_hardirq(acpi_sci_irq);
1127         flush_workqueue(kacpid_wq);
1128         flush_workqueue(kacpi_notify_wq);
1129 }
1130
1131 struct acpi_hp_work {
1132         struct work_struct work;
1133         struct acpi_device *adev;
1134         u32 src;
1135 };
1136
1137 static void acpi_hotplug_work_fn(struct work_struct *work)
1138 {
1139         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1140
1141         acpi_os_wait_events_complete();
1142         acpi_device_hotplug(hpw->adev, hpw->src);
1143         kfree(hpw);
1144 }
1145
1146 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1147 {
1148         struct acpi_hp_work *hpw;
1149
1150         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1151                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1152                   adev, src));
1153
1154         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1155         if (!hpw)
1156                 return AE_NO_MEMORY;
1157
1158         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1159         hpw->adev = adev;
1160         hpw->src = src;
1161         /*
1162          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1163          * the hotplug code may call driver .remove() functions, which may
1164          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1165          * these workqueues.
1166          */
1167         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1168                 kfree(hpw);
1169                 return AE_ERROR;
1170         }
1171         return AE_OK;
1172 }
1173
1174 bool acpi_queue_hotplug_work(struct work_struct *work)
1175 {
1176         return queue_work(kacpi_hotplug_wq, work);
1177 }
1178
1179 acpi_status
1180 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1181 {
1182         struct semaphore *sem = NULL;
1183
1184         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1185         if (!sem)
1186                 return AE_NO_MEMORY;
1187
1188         sema_init(sem, initial_units);
1189
1190         *handle = (acpi_handle *) sem;
1191
1192         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1193                           *handle, initial_units));
1194
1195         return AE_OK;
1196 }
1197
1198 /*
1199  * TODO: A better way to delete semaphores?  Linux doesn't have a
1200  * 'delete_semaphore()' function -- may result in an invalid
1201  * pointer dereference for non-synchronized consumers.  Should
1202  * we at least check for blocked threads and signal/cancel them?
1203  */
1204
1205 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1206 {
1207         struct semaphore *sem = (struct semaphore *)handle;
1208
1209         if (!sem)
1210                 return AE_BAD_PARAMETER;
1211
1212         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1213
1214         BUG_ON(!list_empty(&sem->wait_list));
1215         kfree(sem);
1216         sem = NULL;
1217
1218         return AE_OK;
1219 }
1220
1221 /*
1222  * TODO: Support for units > 1?
1223  */
1224 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1225 {
1226         acpi_status status = AE_OK;
1227         struct semaphore *sem = (struct semaphore *)handle;
1228         long jiffies;
1229         int ret = 0;
1230
1231         if (!acpi_os_initialized)
1232                 return AE_OK;
1233
1234         if (!sem || (units < 1))
1235                 return AE_BAD_PARAMETER;
1236
1237         if (units > 1)
1238                 return AE_SUPPORT;
1239
1240         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1241                           handle, units, timeout));
1242
1243         if (timeout == ACPI_WAIT_FOREVER)
1244                 jiffies = MAX_SCHEDULE_TIMEOUT;
1245         else
1246                 jiffies = msecs_to_jiffies(timeout);
1247
1248         ret = down_timeout(sem, jiffies);
1249         if (ret)
1250                 status = AE_TIME;
1251
1252         if (ACPI_FAILURE(status)) {
1253                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1254                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1255                                   handle, units, timeout,
1256                                   acpi_format_exception(status)));
1257         } else {
1258                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1259                                   "Acquired semaphore[%p|%d|%d]", handle,
1260                                   units, timeout));
1261         }
1262
1263         return status;
1264 }
1265
1266 /*
1267  * TODO: Support for units > 1?
1268  */
1269 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1270 {
1271         struct semaphore *sem = (struct semaphore *)handle;
1272
1273         if (!acpi_os_initialized)
1274                 return AE_OK;
1275
1276         if (!sem || (units < 1))
1277                 return AE_BAD_PARAMETER;
1278
1279         if (units > 1)
1280                 return AE_SUPPORT;
1281
1282         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1283                           units));
1284
1285         up(sem);
1286
1287         return AE_OK;
1288 }
1289
1290 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1291 {
1292 #ifdef ENABLE_DEBUGGER
1293         if (acpi_in_debugger) {
1294                 u32 chars;
1295
1296                 kdb_read(buffer, buffer_length);
1297
1298                 /* remove the CR kdb includes */
1299                 chars = strlen(buffer) - 1;
1300                 buffer[chars] = '\0';
1301         }
1302 #else
1303         int ret;
1304
1305         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1306         if (ret < 0)
1307                 return AE_ERROR;
1308         if (bytes_read)
1309                 *bytes_read = ret;
1310 #endif
1311
1312         return AE_OK;
1313 }
1314 EXPORT_SYMBOL(acpi_os_get_line);
1315
1316 acpi_status acpi_os_wait_command_ready(void)
1317 {
1318         int ret;
1319
1320         ret = acpi_debugger_wait_command_ready();
1321         if (ret < 0)
1322                 return AE_ERROR;
1323         return AE_OK;
1324 }
1325
1326 acpi_status acpi_os_notify_command_complete(void)
1327 {
1328         int ret;
1329
1330         ret = acpi_debugger_notify_command_complete();
1331         if (ret < 0)
1332                 return AE_ERROR;
1333         return AE_OK;
1334 }
1335
1336 acpi_status acpi_os_signal(u32 function, void *info)
1337 {
1338         switch (function) {
1339         case ACPI_SIGNAL_FATAL:
1340                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1341                 break;
1342         case ACPI_SIGNAL_BREAKPOINT:
1343                 /*
1344                  * AML Breakpoint
1345                  * ACPI spec. says to treat it as a NOP unless
1346                  * you are debugging.  So if/when we integrate
1347                  * AML debugger into the kernel debugger its
1348                  * hook will go here.  But until then it is
1349                  * not useful to print anything on breakpoints.
1350                  */
1351                 break;
1352         default:
1353                 break;
1354         }
1355
1356         return AE_OK;
1357 }
1358
1359 static int __init acpi_os_name_setup(char *str)
1360 {
1361         char *p = acpi_os_name;
1362         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1363
1364         if (!str || !*str)
1365                 return 0;
1366
1367         for (; count-- && *str; str++) {
1368                 if (isalnum(*str) || *str == ' ' || *str == ':')
1369                         *p++ = *str;
1370                 else if (*str == '\'' || *str == '"')
1371                         continue;
1372                 else
1373                         break;
1374         }
1375         *p = 0;
1376
1377         return 1;
1378
1379 }
1380
1381 __setup("acpi_os_name=", acpi_os_name_setup);
1382
1383 /*
1384  * Disable the auto-serialization of named objects creation methods.
1385  *
1386  * This feature is enabled by default.  It marks the AML control methods
1387  * that contain the opcodes to create named objects as "Serialized".
1388  */
1389 static int __init acpi_no_auto_serialize_setup(char *str)
1390 {
1391         acpi_gbl_auto_serialize_methods = FALSE;
1392         pr_info("ACPI: auto-serialization disabled\n");
1393
1394         return 1;
1395 }
1396
1397 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1398
1399 /* Check of resource interference between native drivers and ACPI
1400  * OperationRegions (SystemIO and System Memory only).
1401  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1402  * in arbitrary AML code and can interfere with legacy drivers.
1403  * acpi_enforce_resources= can be set to:
1404  *
1405  *   - strict (default) (2)
1406  *     -> further driver trying to access the resources will not load
1407  *   - lax              (1)
1408  *     -> further driver trying to access the resources will load, but you
1409  *     get a system message that something might go wrong...
1410  *
1411  *   - no               (0)
1412  *     -> ACPI Operation Region resources will not be registered
1413  *
1414  */
1415 #define ENFORCE_RESOURCES_STRICT 2
1416 #define ENFORCE_RESOURCES_LAX    1
1417 #define ENFORCE_RESOURCES_NO     0
1418
1419 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1420
1421 static int __init acpi_enforce_resources_setup(char *str)
1422 {
1423         if (str == NULL || *str == '\0')
1424                 return 0;
1425
1426         if (!strcmp("strict", str))
1427                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1428         else if (!strcmp("lax", str))
1429                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1430         else if (!strcmp("no", str))
1431                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1432
1433         return 1;
1434 }
1435
1436 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1437
1438 /* Check for resource conflicts between ACPI OperationRegions and native
1439  * drivers */
1440 int acpi_check_resource_conflict(const struct resource *res)
1441 {
1442         acpi_adr_space_type space_id;
1443         acpi_size length;
1444         u8 warn = 0;
1445         int clash = 0;
1446
1447         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1448                 return 0;
1449         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1450                 return 0;
1451
1452         if (res->flags & IORESOURCE_IO)
1453                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1454         else
1455                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1456
1457         length = resource_size(res);
1458         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1459                 warn = 1;
1460         clash = acpi_check_address_range(space_id, res->start, length, warn);
1461
1462         if (clash) {
1463                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1464                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1465                                 printk(KERN_NOTICE "ACPI: This conflict may"
1466                                        " cause random problems and system"
1467                                        " instability\n");
1468                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1469                                " for this device, you should use it instead of"
1470                                " the native driver\n");
1471                 }
1472                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1473                         return -EBUSY;
1474         }
1475         return 0;
1476 }
1477 EXPORT_SYMBOL(acpi_check_resource_conflict);
1478
1479 int acpi_check_region(resource_size_t start, resource_size_t n,
1480                       const char *name)
1481 {
1482         struct resource res = {
1483                 .start = start,
1484                 .end   = start + n - 1,
1485                 .name  = name,
1486                 .flags = IORESOURCE_IO,
1487         };
1488
1489         return acpi_check_resource_conflict(&res);
1490 }
1491 EXPORT_SYMBOL(acpi_check_region);
1492
1493 /*
1494  * Let drivers know whether the resource checks are effective
1495  */
1496 int acpi_resources_are_enforced(void)
1497 {
1498         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1499 }
1500 EXPORT_SYMBOL(acpi_resources_are_enforced);
1501
1502 /*
1503  * Deallocate the memory for a spinlock.
1504  */
1505 void acpi_os_delete_lock(acpi_spinlock handle)
1506 {
1507         ACPI_FREE(handle);
1508 }
1509
1510 /*
1511  * Acquire a spinlock.
1512  *
1513  * handle is a pointer to the spinlock_t.
1514  */
1515
1516 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1517 {
1518         acpi_cpu_flags flags;
1519         spin_lock_irqsave(lockp, flags);
1520         return flags;
1521 }
1522
1523 /*
1524  * Release a spinlock. See above.
1525  */
1526
1527 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1528 {
1529         spin_unlock_irqrestore(lockp, flags);
1530 }
1531
1532 #ifndef ACPI_USE_LOCAL_CACHE
1533
1534 /*******************************************************************************
1535  *
1536  * FUNCTION:    acpi_os_create_cache
1537  *
1538  * PARAMETERS:  name      - Ascii name for the cache
1539  *              size      - Size of each cached object
1540  *              depth     - Maximum depth of the cache (in objects) <ignored>
1541  *              cache     - Where the new cache object is returned
1542  *
1543  * RETURN:      status
1544  *
1545  * DESCRIPTION: Create a cache object
1546  *
1547  ******************************************************************************/
1548
1549 acpi_status
1550 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1551 {
1552         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1553         if (*cache == NULL)
1554                 return AE_ERROR;
1555         else
1556                 return AE_OK;
1557 }
1558
1559 /*******************************************************************************
1560  *
1561  * FUNCTION:    acpi_os_purge_cache
1562  *
1563  * PARAMETERS:  Cache           - Handle to cache object
1564  *
1565  * RETURN:      Status
1566  *
1567  * DESCRIPTION: Free all objects within the requested cache.
1568  *
1569  ******************************************************************************/
1570
1571 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1572 {
1573         kmem_cache_shrink(cache);
1574         return (AE_OK);
1575 }
1576
1577 /*******************************************************************************
1578  *
1579  * FUNCTION:    acpi_os_delete_cache
1580  *
1581  * PARAMETERS:  Cache           - Handle to cache object
1582  *
1583  * RETURN:      Status
1584  *
1585  * DESCRIPTION: Free all objects within the requested cache and delete the
1586  *              cache object.
1587  *
1588  ******************************************************************************/
1589
1590 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1591 {
1592         kmem_cache_destroy(cache);
1593         return (AE_OK);
1594 }
1595
1596 /*******************************************************************************
1597  *
1598  * FUNCTION:    acpi_os_release_object
1599  *
1600  * PARAMETERS:  Cache       - Handle to cache object
1601  *              Object      - The object to be released
1602  *
1603  * RETURN:      None
1604  *
1605  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1606  *              the object is deleted.
1607  *
1608  ******************************************************************************/
1609
1610 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1611 {
1612         kmem_cache_free(cache, object);
1613         return (AE_OK);
1614 }
1615 #endif
1616
1617 static int __init acpi_no_static_ssdt_setup(char *s)
1618 {
1619         acpi_gbl_disable_ssdt_table_install = TRUE;
1620         pr_info("ACPI: static SSDT installation disabled\n");
1621
1622         return 0;
1623 }
1624
1625 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1626
1627 static int __init acpi_disable_return_repair(char *s)
1628 {
1629         printk(KERN_NOTICE PREFIX
1630                "ACPI: Predefined validation mechanism disabled\n");
1631         acpi_gbl_disable_auto_repair = TRUE;
1632
1633         return 1;
1634 }
1635
1636 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1637
1638 acpi_status __init acpi_os_initialize(void)
1639 {
1640         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1641         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1642         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1643         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1644         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1645                 /*
1646                  * Use acpi_os_map_generic_address to pre-map the reset
1647                  * register if it's in system memory.
1648                  */
1649                 int rv;
1650
1651                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1652                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1653         }
1654         acpi_os_initialized = true;
1655
1656         return AE_OK;
1657 }
1658
1659 acpi_status __init acpi_os_initialize1(void)
1660 {
1661         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1662         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1663         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1664         BUG_ON(!kacpid_wq);
1665         BUG_ON(!kacpi_notify_wq);
1666         BUG_ON(!kacpi_hotplug_wq);
1667         acpi_osi_init();
1668         return AE_OK;
1669 }
1670
1671 acpi_status acpi_os_terminate(void)
1672 {
1673         if (acpi_irq_handler) {
1674                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1675                                                  acpi_irq_handler);
1676         }
1677
1678         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1679         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1680         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1681         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1682         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1683                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1684
1685         destroy_workqueue(kacpid_wq);
1686         destroy_workqueue(kacpi_notify_wq);
1687         destroy_workqueue(kacpi_hotplug_wq);
1688
1689         return AE_OK;
1690 }
1691
1692 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1693                                   u32 pm1b_control)
1694 {
1695         int rc = 0;
1696         if (__acpi_os_prepare_sleep)
1697                 rc = __acpi_os_prepare_sleep(sleep_state,
1698                                              pm1a_control, pm1b_control);
1699         if (rc < 0)
1700                 return AE_ERROR;
1701         else if (rc > 0)
1702                 return AE_CTRL_TERMINATE;
1703
1704         return AE_OK;
1705 }
1706
1707 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1708                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1709 {
1710         __acpi_os_prepare_sleep = func;
1711 }
1712
1713 #if (ACPI_REDUCED_HARDWARE)
1714 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1715                                   u32 val_b)
1716 {
1717         int rc = 0;
1718         if (__acpi_os_prepare_extended_sleep)
1719                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1720                                              val_a, val_b);
1721         if (rc < 0)
1722                 return AE_ERROR;
1723         else if (rc > 0)
1724                 return AE_CTRL_TERMINATE;
1725
1726         return AE_OK;
1727 }
1728 #else
1729 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1730                                   u32 val_b)
1731 {
1732         return AE_OK;
1733 }
1734 #endif
1735
1736 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1737                                u32 val_a, u32 val_b))
1738 {
1739         __acpi_os_prepare_extended_sleep = func;
1740 }
1741
1742 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1743                                 u32 reg_a_value, u32 reg_b_value)
1744 {
1745         acpi_status status;
1746
1747         if (acpi_gbl_reduced_hardware)
1748                 status = acpi_os_prepare_extended_sleep(sleep_state,
1749                                                         reg_a_value,
1750                                                         reg_b_value);
1751         else
1752                 status = acpi_os_prepare_sleep(sleep_state,
1753                                                reg_a_value, reg_b_value);
1754         return status;
1755 }