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 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 667 {
 668
 669         switch (width) {
 670         case 8:
 671                 *(u8 *) value = readb(virt_addr);
 672                 break;
 673         case 16:
 674                 *(u16 *) value = readw(virt_addr);
 675                 break;
 676         case 32:
 677                 *(u32 *) value = readl(virt_addr);
 678                 break;
 679         case 64:
 680                 *(u64 *) value = readq(virt_addr);
 681                 break;
 682         default:
 683                 return -EINVAL;
 684         }
 685
 686         return 0;
 687 }
 688
 689 acpi_status
 690 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 691 {
 692         void __iomem *virt_addr;
 693         unsigned int size = width / 8;
 694         bool unmap = false;
 695         u64 dummy;
 696         int error;
 697
 698         rcu_read_lock();
 699         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 700         if (!virt_addr) {
 701                 rcu_read_unlock();
 702                 virt_addr = acpi_os_ioremap(phys_addr, size);
 703                 if (!virt_addr)
 704                         return AE_BAD_ADDRESS;
 705                 unmap = true;
 706         }
 707
 708         if (!value)
 709                 value = &dummy;
 710
 711         error = acpi_os_read_iomem(virt_addr, value, width);
 712         BUG_ON(error);
 713
 714         if (unmap)
 715                 iounmap(virt_addr);
 716         else
 717                 rcu_read_unlock();
 718
 719         return AE_OK;
 720 }
 721
 722 acpi_status
 723 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 724 {
 725         void __iomem *virt_addr;
 726         unsigned int size = width / 8;
 727         bool unmap = false;
 728
 729         rcu_read_lock();
 730         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 731         if (!virt_addr) {
 732                 rcu_read_unlock();
 733                 virt_addr = acpi_os_ioremap(phys_addr, size);
 734                 if (!virt_addr)
 735                         return AE_BAD_ADDRESS;
 736                 unmap = true;
 737         }
 738
 739         switch (width) {
 740         case 8:
 741                 writeb(value, virt_addr);
 742                 break;
 743         case 16:
 744                 writew(value, virt_addr);
 745                 break;
 746         case 32:
 747                 writel(value, virt_addr);
 748                 break;
 749         case 64:
 750                 writeq(value, virt_addr);
 751                 break;
 752         default:
 753                 BUG();
 754         }
 755
 756         if (unmap)
 757                 iounmap(virt_addr);
 758         else
 759                 rcu_read_unlock();
 760
 761         return AE_OK;
 762 }
 763
 764 acpi_status
 765 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 766                                u64 *value, u32 width)
 767 {
 768         int result, size;
 769         u32 value32;
 770
 771         if (!value)
 772                 return AE_BAD_PARAMETER;
 773
 774         switch (width) {
 775         case 8:
 776                 size = 1;
 777                 break;
 778         case 16:
 779                 size = 2;
 780                 break;
 781         case 32:
 782                 size = 4;
 783                 break;
 784         default:
 785                 return AE_ERROR;
 786         }
 787
 788         result = raw_pci_read(pci_id->segment, pci_id->bus,
 789                                 PCI_DEVFN(pci_id->device, pci_id->function),
 790                                 reg, size, &value32);
 791         *value = value32;
 792
 793         return (result ? AE_ERROR : AE_OK);
 794 }
 795
 796 acpi_status
 797 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 798                                 u64 value, u32 width)
 799 {
 800         int result, size;
 801
 802         switch (width) {
 803         case 8:
 804                 size = 1;
 805                 break;
 806         case 16:
 807                 size = 2;
 808                 break;
 809         case 32:
 810                 size = 4;
 811                 break;
 812         default:
 813                 return AE_ERROR;
 814         }
 815
 816         result = raw_pci_write(pci_id->segment, pci_id->bus,
 817                                 PCI_DEVFN(pci_id->device, pci_id->function),
 818                                 reg, size, value);
 819
 820         return (result ? AE_ERROR : AE_OK);
 821 }
 822
 823 static void acpi_os_execute_deferred(struct work_struct *work)
 824 {
 825         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 826
 827         dpc->function(dpc->context);
 828         kfree(dpc);
 829 }
 830
 831 #ifdef CONFIG_ACPI_DEBUGGER
 832 static struct acpi_debugger acpi_debugger;
 833 static bool acpi_debugger_initialized;
 834
 835 int acpi_register_debugger(struct module *owner,
 836                            const struct acpi_debugger_ops *ops)
 837 {
 838         int ret = 0;
 839
 840         mutex_lock(&acpi_debugger.lock);
 841         if (acpi_debugger.ops) {
 842                 ret = -EBUSY;
 843                 goto err_lock;
 844         }
 845
 846         acpi_debugger.owner = owner;
 847         acpi_debugger.ops = ops;
 848
 849 err_lock:
 850         mutex_unlock(&acpi_debugger.lock);
 851         return ret;
 852 }
 853 EXPORT_SYMBOL(acpi_register_debugger);
 854
 855 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 856 {
 857         mutex_lock(&acpi_debugger.lock);
 858         if (ops == acpi_debugger.ops) {
 859                 acpi_debugger.ops = NULL;
 860                 acpi_debugger.owner = NULL;
 861         }
 862         mutex_unlock(&acpi_debugger.lock);
 863 }
 864 EXPORT_SYMBOL(acpi_unregister_debugger);
 865
 866 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 867 {
 868         int ret;
 869         int (*func)(acpi_osd_exec_callback, void *);
 870         struct module *owner;
 871
 872         if (!acpi_debugger_initialized)
 873                 return -ENODEV;
 874         mutex_lock(&acpi_debugger.lock);
 875         if (!acpi_debugger.ops) {
 876                 ret = -ENODEV;
 877                 goto err_lock;
 878         }
 879         if (!try_module_get(acpi_debugger.owner)) {
 880                 ret = -ENODEV;
 881                 goto err_lock;
 882         }
 883         func = acpi_debugger.ops->create_thread;
 884         owner = acpi_debugger.owner;
 885         mutex_unlock(&acpi_debugger.lock);
 886
 887         ret = func(function, context);
 888
 889         mutex_lock(&acpi_debugger.lock);
 890         module_put(owner);
 891 err_lock:
 892         mutex_unlock(&acpi_debugger.lock);
 893         return ret;
 894 }
 895
 896 ssize_t acpi_debugger_write_log(const char *msg)
 897 {
 898         ssize_t ret;
 899         ssize_t (*func)(const char *);
 900         struct module *owner;
 901
 902         if (!acpi_debugger_initialized)
 903                 return -ENODEV;
 904         mutex_lock(&acpi_debugger.lock);
 905         if (!acpi_debugger.ops) {
 906                 ret = -ENODEV;
 907                 goto err_lock;
 908         }
 909         if (!try_module_get(acpi_debugger.owner)) {
 910                 ret = -ENODEV;
 911                 goto err_lock;
 912         }
 913         func = acpi_debugger.ops->write_log;
 914         owner = acpi_debugger.owner;
 915         mutex_unlock(&acpi_debugger.lock);
 916
 917         ret = func(msg);
 918
 919         mutex_lock(&acpi_debugger.lock);
 920         module_put(owner);
 921 err_lock:
 922         mutex_unlock(&acpi_debugger.lock);
 923         return ret;
 924 }
 925
 926 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 927 {
 928         ssize_t ret;
 929         ssize_t (*func)(char *, size_t);
 930         struct module *owner;
 931
 932         if (!acpi_debugger_initialized)
 933                 return -ENODEV;
 934         mutex_lock(&acpi_debugger.lock);
 935         if (!acpi_debugger.ops) {
 936                 ret = -ENODEV;
 937                 goto err_lock;
 938         }
 939         if (!try_module_get(acpi_debugger.owner)) {
 940                 ret = -ENODEV;
 941                 goto err_lock;
 942         }
 943         func = acpi_debugger.ops->read_cmd;
 944         owner = acpi_debugger.owner;
 945         mutex_unlock(&acpi_debugger.lock);
 946
 947         ret = func(buffer, buffer_length);
 948
 949         mutex_lock(&acpi_debugger.lock);
 950         module_put(owner);
 951 err_lock:
 952         mutex_unlock(&acpi_debugger.lock);
 953         return ret;
 954 }
 955
 956 int acpi_debugger_wait_command_ready(void)
 957 {
 958         int ret;
 959         int (*func)(bool, char *, size_t);
 960         struct module *owner;
 961
 962         if (!acpi_debugger_initialized)
 963                 return -ENODEV;
 964         mutex_lock(&acpi_debugger.lock);
 965         if (!acpi_debugger.ops) {
 966                 ret = -ENODEV;
 967                 goto err_lock;
 968         }
 969         if (!try_module_get(acpi_debugger.owner)) {
 970                 ret = -ENODEV;
 971                 goto err_lock;
 972         }
 973         func = acpi_debugger.ops->wait_command_ready;
 974         owner = acpi_debugger.owner;
 975         mutex_unlock(&acpi_debugger.lock);
 976
 977         ret = func(acpi_gbl_method_executing,
 978                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
 979
 980         mutex_lock(&acpi_debugger.lock);
 981         module_put(owner);
 982 err_lock:
 983         mutex_unlock(&acpi_debugger.lock);
 984         return ret;
 985 }
 986
 987 int acpi_debugger_notify_command_complete(void)
 988 {
 989         int ret;
 990         int (*func)(void);
 991         struct module *owner;
 992
 993         if (!acpi_debugger_initialized)
 994                 return -ENODEV;
 995         mutex_lock(&acpi_debugger.lock);
 996         if (!acpi_debugger.ops) {
 997                 ret = -ENODEV;
 998                 goto err_lock;
 999         }
1000         if (!try_module_get(acpi_debugger.owner)) {
1001                 ret = -ENODEV;
1002                 goto err_lock;
1003         }
1004         func = acpi_debugger.ops->notify_command_complete;
1005         owner = acpi_debugger.owner;
1006         mutex_unlock(&acpi_debugger.lock);
1007
1008         ret = func();
1009
1010         mutex_lock(&acpi_debugger.lock);
1011         module_put(owner);
1012 err_lock:
1013         mutex_unlock(&acpi_debugger.lock);
1014         return ret;
1015 }
1016
1017 int __init acpi_debugger_init(void)
1018 {
1019         mutex_init(&acpi_debugger.lock);
1020         acpi_debugger_initialized = true;
1021         return 0;
1022 }
1023 #endif
1024
1025 /*******************************************************************************
1026  *
1027  * FUNCTION:    acpi_os_execute
1028  *
1029  * PARAMETERS:  Type               - Type of the callback
1030  *              Function           - Function to be executed
1031  *              Context            - Function parameters
1032  *
1033  * RETURN:      Status
1034  *
1035  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1036  *              immediately executes function on a separate thread.
1037  *
1038  ******************************************************************************/
1039
1040 acpi_status acpi_os_execute(acpi_execute_type type,
1041                             acpi_osd_exec_callback function, void *context)
1042 {
1043         acpi_status status = AE_OK;
1044         struct acpi_os_dpc *dpc;
1045         struct workqueue_struct *queue;
1046         int ret;
1047         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1048                           "Scheduling function [%p(%p)] for deferred execution.\n",
1049                           function, context));
1050
1051         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1052                 ret = acpi_debugger_create_thread(function, context);
1053                 if (ret) {
1054                         pr_err("Call to kthread_create() failed.\n");
1055                         status = AE_ERROR;
1056                 }
1057                 goto out_thread;
1058         }
1059
1060         /*
1061          * Allocate/initialize DPC structure.  Note that this memory will be
1062          * freed by the callee.  The kernel handles the work_struct list  in a
1063          * way that allows us to also free its memory inside the callee.
1064          * Because we may want to schedule several tasks with different
1065          * parameters we can't use the approach some kernel code uses of
1066          * having a static work_struct.
1067          */
1068
1069         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1070         if (!dpc)
1071                 return AE_NO_MEMORY;
1072
1073         dpc->function = function;
1074         dpc->context = context;
1075
1076         /*
1077          * To prevent lockdep from complaining unnecessarily, make sure that
1078          * there is a different static lockdep key for each workqueue by using
1079          * INIT_WORK() for each of them separately.
1080          */
1081         if (type == OSL_NOTIFY_HANDLER) {
1082                 queue = kacpi_notify_wq;
1083                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1084         } else if (type == OSL_GPE_HANDLER) {
1085                 queue = kacpid_wq;
1086                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1087         } else {
1088                 pr_err("Unsupported os_execute type %d.\n", type);
1089                 status = AE_ERROR;
1090         }
1091
1092         if (ACPI_FAILURE(status))
1093                 goto err_workqueue;
1094
1095         /*
1096          * On some machines, a software-initiated SMI causes corruption unless
1097          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1098          * typically it's done in GPE-related methods that are run via
1099          * workqueues, so we can avoid the known corruption cases by always
1100          * queueing on CPU 0.
1101          */
1102         ret = queue_work_on(0, queue, &dpc->work);
1103         if (!ret) {
1104                 printk(KERN_ERR PREFIX
1105                           "Call to queue_work() failed.\n");
1106                 status = AE_ERROR;
1107         }
1108 err_workqueue:
1109         if (ACPI_FAILURE(status))
1110                 kfree(dpc);
1111 out_thread:
1112         return status;
1113 }
1114 EXPORT_SYMBOL(acpi_os_execute);
1115
1116 void acpi_os_wait_events_complete(void)
1117 {
1118         /*
1119          * Make sure the GPE handler or the fixed event handler is not used
1120          * on another CPU after removal.
1121          */
1122         if (acpi_sci_irq_valid())
1123                 synchronize_hardirq(acpi_sci_irq);
1124         flush_workqueue(kacpid_wq);
1125         flush_workqueue(kacpi_notify_wq);
1126 }
1127
1128 struct acpi_hp_work {
1129         struct work_struct work;
1130         struct acpi_device *adev;
1131         u32 src;
1132 };
1133
1134 static void acpi_hotplug_work_fn(struct work_struct *work)
1135 {
1136         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1137
1138         acpi_os_wait_events_complete();
1139         acpi_device_hotplug(hpw->adev, hpw->src);
1140         kfree(hpw);
1141 }
1142
1143 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1144 {
1145         struct acpi_hp_work *hpw;
1146
1147         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1148                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1149                   adev, src));
1150
1151         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1152         if (!hpw)
1153                 return AE_NO_MEMORY;
1154
1155         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1156         hpw->adev = adev;
1157         hpw->src = src;
1158         /*
1159          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1160          * the hotplug code may call driver .remove() functions, which may
1161          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1162          * these workqueues.
1163          */
1164         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1165                 kfree(hpw);
1166                 return AE_ERROR;
1167         }
1168         return AE_OK;
1169 }
1170
1171 bool acpi_queue_hotplug_work(struct work_struct *work)
1172 {
1173         return queue_work(kacpi_hotplug_wq, work);
1174 }
1175
1176 acpi_status
1177 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1178 {
1179         struct semaphore *sem = NULL;
1180
1181         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1182         if (!sem)
1183                 return AE_NO_MEMORY;
1184
1185         sema_init(sem, initial_units);
1186
1187         *handle = (acpi_handle *) sem;
1188
1189         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1190                           *handle, initial_units));
1191
1192         return AE_OK;
1193 }
1194
1195 /*
1196  * TODO: A better way to delete semaphores?  Linux doesn't have a
1197  * 'delete_semaphore()' function -- may result in an invalid
1198  * pointer dereference for non-synchronized consumers.  Should
1199  * we at least check for blocked threads and signal/cancel them?
1200  */
1201
1202 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1203 {
1204         struct semaphore *sem = (struct semaphore *)handle;
1205
1206         if (!sem)
1207                 return AE_BAD_PARAMETER;
1208
1209         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1210
1211         BUG_ON(!list_empty(&sem->wait_list));
1212         kfree(sem);
1213         sem = NULL;
1214
1215         return AE_OK;
1216 }
1217
1218 /*
1219  * TODO: Support for units > 1?
1220  */
1221 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1222 {
1223         acpi_status status = AE_OK;
1224         struct semaphore *sem = (struct semaphore *)handle;
1225         long jiffies;
1226         int ret = 0;
1227
1228         if (!acpi_os_initialized)
1229                 return AE_OK;
1230
1231         if (!sem || (units < 1))
1232                 return AE_BAD_PARAMETER;
1233
1234         if (units > 1)
1235                 return AE_SUPPORT;
1236
1237         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1238                           handle, units, timeout));
1239
1240         if (timeout == ACPI_WAIT_FOREVER)
1241                 jiffies = MAX_SCHEDULE_TIMEOUT;
1242         else
1243                 jiffies = msecs_to_jiffies(timeout);
1244
1245         ret = down_timeout(sem, jiffies);
1246         if (ret)
1247                 status = AE_TIME;
1248
1249         if (ACPI_FAILURE(status)) {
1250                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1251                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1252                                   handle, units, timeout,
1253                                   acpi_format_exception(status)));
1254         } else {
1255                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1256                                   "Acquired semaphore[%p|%d|%d]", handle,
1257                                   units, timeout));
1258         }
1259
1260         return status;
1261 }
1262
1263 /*
1264  * TODO: Support for units > 1?
1265  */
1266 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1267 {
1268         struct semaphore *sem = (struct semaphore *)handle;
1269
1270         if (!acpi_os_initialized)
1271                 return AE_OK;
1272
1273         if (!sem || (units < 1))
1274                 return AE_BAD_PARAMETER;
1275
1276         if (units > 1)
1277                 return AE_SUPPORT;
1278
1279         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1280                           units));
1281
1282         up(sem);
1283
1284         return AE_OK;
1285 }
1286
1287 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1288 {
1289 #ifdef ENABLE_DEBUGGER
1290         if (acpi_in_debugger) {
1291                 u32 chars;
1292
1293                 kdb_read(buffer, buffer_length);
1294
1295                 /* remove the CR kdb includes */
1296                 chars = strlen(buffer) - 1;
1297                 buffer[chars] = '\0';
1298         }
1299 #else
1300         int ret;
1301
1302         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1303         if (ret < 0)
1304                 return AE_ERROR;
1305         if (bytes_read)
1306                 *bytes_read = ret;
1307 #endif
1308
1309         return AE_OK;
1310 }
1311 EXPORT_SYMBOL(acpi_os_get_line);
1312
1313 acpi_status acpi_os_wait_command_ready(void)
1314 {
1315         int ret;
1316
1317         ret = acpi_debugger_wait_command_ready();
1318         if (ret < 0)
1319                 return AE_ERROR;
1320         return AE_OK;
1321 }
1322
1323 acpi_status acpi_os_notify_command_complete(void)
1324 {
1325         int ret;
1326
1327         ret = acpi_debugger_notify_command_complete();
1328         if (ret < 0)
1329                 return AE_ERROR;
1330         return AE_OK;
1331 }
1332
1333 acpi_status acpi_os_signal(u32 function, void *info)
1334 {
1335         switch (function) {
1336         case ACPI_SIGNAL_FATAL:
1337                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1338                 break;
1339         case ACPI_SIGNAL_BREAKPOINT:
1340                 /*
1341                  * AML Breakpoint
1342                  * ACPI spec. says to treat it as a NOP unless
1343                  * you are debugging.  So if/when we integrate
1344                  * AML debugger into the kernel debugger its
1345                  * hook will go here.  But until then it is
1346                  * not useful to print anything on breakpoints.
1347                  */
1348                 break;
1349         default:
1350                 break;
1351         }
1352
1353         return AE_OK;
1354 }
1355
1356 static int __init acpi_os_name_setup(char *str)
1357 {
1358         char *p = acpi_os_name;
1359         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1360
1361         if (!str || !*str)
1362                 return 0;
1363
1364         for (; count-- && *str; str++) {
1365                 if (isalnum(*str) || *str == ' ' || *str == ':')
1366                         *p++ = *str;
1367                 else if (*str == '\'' || *str == '"')
1368                         continue;
1369                 else
1370                         break;
1371         }
1372         *p = 0;
1373
1374         return 1;
1375
1376 }
1377
1378 __setup("acpi_os_name=", acpi_os_name_setup);
1379
1380 /*
1381  * Disable the auto-serialization of named objects creation methods.
1382  *
1383  * This feature is enabled by default.  It marks the AML control methods
1384  * that contain the opcodes to create named objects as "Serialized".
1385  */
1386 static int __init acpi_no_auto_serialize_setup(char *str)
1387 {
1388         acpi_gbl_auto_serialize_methods = FALSE;
1389         pr_info("ACPI: auto-serialization disabled\n");
1390
1391         return 1;
1392 }
1393
1394 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1395
1396 /* Check of resource interference between native drivers and ACPI
1397  * OperationRegions (SystemIO and System Memory only).
1398  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1399  * in arbitrary AML code and can interfere with legacy drivers.
1400  * acpi_enforce_resources= can be set to:
1401  *
1402  *   - strict (default) (2)
1403  *     -> further driver trying to access the resources will not load
1404  *   - lax              (1)
1405  *     -> further driver trying to access the resources will load, but you
1406  *     get a system message that something might go wrong...
1407  *
1408  *   - no               (0)
1409  *     -> ACPI Operation Region resources will not be registered
1410  *
1411  */
1412 #define ENFORCE_RESOURCES_STRICT 2
1413 #define ENFORCE_RESOURCES_LAX    1
1414 #define ENFORCE_RESOURCES_NO     0
1415
1416 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1417
1418 static int __init acpi_enforce_resources_setup(char *str)
1419 {
1420         if (str == NULL || *str == '\0')
1421                 return 0;
1422
1423         if (!strcmp("strict", str))
1424                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1425         else if (!strcmp("lax", str))
1426                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1427         else if (!strcmp("no", str))
1428                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1429
1430         return 1;
1431 }
1432
1433 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1434
1435 /* Check for resource conflicts between ACPI OperationRegions and native
1436  * drivers */
1437 int acpi_check_resource_conflict(const struct resource *res)
1438 {
1439         acpi_adr_space_type space_id;
1440         acpi_size length;
1441         u8 warn = 0;
1442         int clash = 0;
1443
1444         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1445                 return 0;
1446         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1447                 return 0;
1448
1449         if (res->flags & IORESOURCE_IO)
1450                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1451         else
1452                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1453
1454         length = resource_size(res);
1455         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1456                 warn = 1;
1457         clash = acpi_check_address_range(space_id, res->start, length, warn);
1458
1459         if (clash) {
1460                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1461                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1462                                 printk(KERN_NOTICE "ACPI: This conflict may"
1463                                        " cause random problems and system"
1464                                        " instability\n");
1465                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1466                                " for this device, you should use it instead of"
1467                                " the native driver\n");
1468                 }
1469                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1470                         return -EBUSY;
1471         }
1472         return 0;
1473 }
1474 EXPORT_SYMBOL(acpi_check_resource_conflict);
1475
1476 int acpi_check_region(resource_size_t start, resource_size_t n,
1477                       const char *name)
1478 {
1479         struct resource res = {
1480                 .start = start,
1481                 .end   = start + n - 1,
1482                 .name  = name,
1483                 .flags = IORESOURCE_IO,
1484         };
1485
1486         return acpi_check_resource_conflict(&res);
1487 }
1488 EXPORT_SYMBOL(acpi_check_region);
1489
1490 /*
1491  * Let drivers know whether the resource checks are effective
1492  */
1493 int acpi_resources_are_enforced(void)
1494 {
1495         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1496 }
1497 EXPORT_SYMBOL(acpi_resources_are_enforced);
1498
1499 /*
1500  * Deallocate the memory for a spinlock.
1501  */
1502 void acpi_os_delete_lock(acpi_spinlock handle)
1503 {
1504         ACPI_FREE(handle);
1505 }
1506
1507 /*
1508  * Acquire a spinlock.
1509  *
1510  * handle is a pointer to the spinlock_t.
1511  */
1512
1513 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1514 {
1515         acpi_cpu_flags flags;
1516         spin_lock_irqsave(lockp, flags);
1517         return flags;
1518 }
1519
1520 /*
1521  * Release a spinlock. See above.
1522  */
1523
1524 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1525 {
1526         spin_unlock_irqrestore(lockp, flags);
1527 }
1528
1529 #ifndef ACPI_USE_LOCAL_CACHE
1530
1531 /*******************************************************************************
1532  *
1533  * FUNCTION:    acpi_os_create_cache
1534  *
1535  * PARAMETERS:  name      - Ascii name for the cache
1536  *              size      - Size of each cached object
1537  *              depth     - Maximum depth of the cache (in objects) <ignored>
1538  *              cache     - Where the new cache object is returned
1539  *
1540  * RETURN:      status
1541  *
1542  * DESCRIPTION: Create a cache object
1543  *
1544  ******************************************************************************/
1545
1546 acpi_status
1547 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1548 {
1549         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1550         if (*cache == NULL)
1551                 return AE_ERROR;
1552         else
1553                 return AE_OK;
1554 }
1555
1556 /*******************************************************************************
1557  *
1558  * FUNCTION:    acpi_os_purge_cache
1559  *
1560  * PARAMETERS:  Cache           - Handle to cache object
1561  *
1562  * RETURN:      Status
1563  *
1564  * DESCRIPTION: Free all objects within the requested cache.
1565  *
1566  ******************************************************************************/
1567
1568 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1569 {
1570         kmem_cache_shrink(cache);
1571         return (AE_OK);
1572 }
1573
1574 /*******************************************************************************
1575  *
1576  * FUNCTION:    acpi_os_delete_cache
1577  *
1578  * PARAMETERS:  Cache           - Handle to cache object
1579  *
1580  * RETURN:      Status
1581  *
1582  * DESCRIPTION: Free all objects within the requested cache and delete the
1583  *              cache object.
1584  *
1585  ******************************************************************************/
1586
1587 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1588 {
1589         kmem_cache_destroy(cache);
1590         return (AE_OK);
1591 }
1592
1593 /*******************************************************************************
1594  *
1595  * FUNCTION:    acpi_os_release_object
1596  *
1597  * PARAMETERS:  Cache       - Handle to cache object
1598  *              Object      - The object to be released
1599  *
1600  * RETURN:      None
1601  *
1602  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1603  *              the object is deleted.
1604  *
1605  ******************************************************************************/
1606
1607 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1608 {
1609         kmem_cache_free(cache, object);
1610         return (AE_OK);
1611 }
1612 #endif
1613
1614 static int __init acpi_no_static_ssdt_setup(char *s)
1615 {
1616         acpi_gbl_disable_ssdt_table_install = TRUE;
1617         pr_info("ACPI: static SSDT installation disabled\n");
1618
1619         return 0;
1620 }
1621
1622 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1623
1624 static int __init acpi_disable_return_repair(char *s)
1625 {
1626         printk(KERN_NOTICE PREFIX
1627                "ACPI: Predefined validation mechanism disabled\n");
1628         acpi_gbl_disable_auto_repair = TRUE;
1629
1630         return 1;
1631 }
1632
1633 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1634
1635 acpi_status __init acpi_os_initialize(void)
1636 {
1637         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1638         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1639         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1640         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1641         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1642                 /*
1643                  * Use acpi_os_map_generic_address to pre-map the reset
1644                  * register if it's in system memory.
1645                  */
1646                 int rv;
1647
1648                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1649                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1650         }
1651         acpi_os_initialized = true;
1652
1653         return AE_OK;
1654 }
1655
1656 acpi_status __init acpi_os_initialize1(void)
1657 {
1658         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1659         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1660         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1661         BUG_ON(!kacpid_wq);
1662         BUG_ON(!kacpi_notify_wq);
1663         BUG_ON(!kacpi_hotplug_wq);
1664         acpi_osi_init();
1665         return AE_OK;
1666 }
1667
1668 acpi_status acpi_os_terminate(void)
1669 {
1670         if (acpi_irq_handler) {
1671                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1672                                                  acpi_irq_handler);
1673         }
1674
1675         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1676         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1677         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1678         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1679         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1680                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1681
1682         destroy_workqueue(kacpid_wq);
1683         destroy_workqueue(kacpi_notify_wq);
1684         destroy_workqueue(kacpi_hotplug_wq);
1685
1686         return AE_OK;
1687 }
1688
1689 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1690                                   u32 pm1b_control)
1691 {
1692         int rc = 0;
1693         if (__acpi_os_prepare_sleep)
1694                 rc = __acpi_os_prepare_sleep(sleep_state,
1695                                              pm1a_control, pm1b_control);
1696         if (rc < 0)
1697                 return AE_ERROR;
1698         else if (rc > 0)
1699                 return AE_CTRL_TERMINATE;
1700
1701         return AE_OK;
1702 }
1703
1704 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1705                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1706 {
1707         __acpi_os_prepare_sleep = func;
1708 }
1709
1710 #if (ACPI_REDUCED_HARDWARE)
1711 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1712                                   u32 val_b)
1713 {
1714         int rc = 0;
1715         if (__acpi_os_prepare_extended_sleep)
1716                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1717                                              val_a, val_b);
1718         if (rc < 0)
1719                 return AE_ERROR;
1720         else if (rc > 0)
1721                 return AE_CTRL_TERMINATE;
1722
1723         return AE_OK;
1724 }
1725 #else
1726 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1727                                   u32 val_b)
1728 {
1729         return AE_OK;
1730 }
1731 #endif
1732
1733 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1734                                u32 val_a, u32 val_b))
1735 {
1736         __acpi_os_prepare_extended_sleep = func;
1737 }
1738
1739 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1740                                 u32 reg_a_value, u32 reg_b_value)
1741 {
1742         acpi_status status;
1743
1744         if (acpi_gbl_reduced_hardware)
1745                 status = acpi_os_prepare_extended_sleep(sleep_state,
1746                                                         reg_a_value,
1747                                                         reg_b_value);
1748         else
1749                 status = acpi_os_prepare_sleep(sleep_state,
1750                                                reg_a_value, reg_b_value);
1751         return status;
1752 }