drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <[email protected]>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pci.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kmod.h>
  34 #include <linux/delay.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/nmi.h>
  37 #include <linux/acpi.h>
  38 #include <linux/efi.h>
  39 #include <linux/ioport.h>
  40 #include <linux/list.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/semaphore.h>
  43
  44 #include <asm/io.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/io-64-nonatomic-lo-hi.h>
  47
  48 #include "acpica/accommon.h"
  49 #include "acpica/acnamesp.h"
  50 #include "internal.h"
  51
  52 #define _COMPONENT              ACPI_OS_SERVICES
  53 ACPI_MODULE_NAME("osl");
  54
  55 struct acpi_os_dpc {
  56         acpi_osd_exec_callback function;
  57         void *context;
  58         struct work_struct work;
  59 };
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67 #endif                          /*ENABLE_DEBUGGER */
  68
  69 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  70                                       u32 pm1b_ctrl);
  71 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  72                                       u32 val_b);
  73
  74 static acpi_osd_handler acpi_irq_handler;
  75 static void *acpi_irq_context;
  76 static struct workqueue_struct *kacpid_wq;
  77 static struct workqueue_struct *kacpi_notify_wq;
  78 static struct workqueue_struct *kacpi_hotplug_wq;
  79 static bool acpi_os_initialized;
  80 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  81 bool acpi_permanent_mmap = false;
  82
  83 /*
  84  * This list of permanent mappings is for memory that may be accessed from
  85  * interrupt context, where we can't do the ioremap().
  86  */
  87 struct acpi_ioremap {
  88         struct list_head list;
  89         void __iomem *virt;
  90         acpi_physical_address phys;
  91         acpi_size size;
  92         unsigned long refcount;
  93 };
  94
  95 static LIST_HEAD(acpi_ioremaps);
  96 static DEFINE_MUTEX(acpi_ioremap_lock);
  97
  98 static void __init acpi_request_region (struct acpi_generic_address *gas,
  99         unsigned int length, char *desc)
 100 {
 101         u64 addr;
 102
 103         /* Handle possible alignment issues */
 104         memcpy(&addr, &gas->address, sizeof(addr));
 105         if (!addr || !length)
 106                 return;
 107
 108         /* Resources are never freed */
 109         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 110                 request_region(addr, length, desc);
 111         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 112                 request_mem_region(addr, length, desc);
 113 }
 114
 115 static int __init acpi_reserve_resources(void)
 116 {
 117         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 118                 "ACPI PM1a_EVT_BLK");
 119
 120         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 121                 "ACPI PM1b_EVT_BLK");
 122
 123         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 124                 "ACPI PM1a_CNT_BLK");
 125
 126         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 127                 "ACPI PM1b_CNT_BLK");
 128
 129         if (acpi_gbl_FADT.pm_timer_length == 4)
 130                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 131
 132         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 133                 "ACPI PM2_CNT_BLK");
 134
 135         /* Length of GPE blocks must be a non-negative multiple of 2 */
 136
 137         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 138                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 139                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 140
 141         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 142                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 143                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 144
 145         return 0;
 146 }
 147 fs_initcall_sync(acpi_reserve_resources);
 148
 149 void acpi_os_printf(const char *fmt, ...)
 150 {
 151         va_list args;
 152         va_start(args, fmt);
 153         acpi_os_vprintf(fmt, args);
 154         va_end(args);
 155 }
 156 EXPORT_SYMBOL(acpi_os_printf);
 157
 158 void acpi_os_vprintf(const char *fmt, va_list args)
 159 {
 160         static char buffer[512];
 161
 162         vsprintf(buffer, fmt, args);
 163
 164 #ifdef ENABLE_DEBUGGER
 165         if (acpi_in_debugger) {
 166                 kdb_printf("%s", buffer);
 167         } else {
 168                 if (printk_get_level(buffer))
 169                         printk("%s", buffer);
 170                 else
 171                         printk(KERN_CONT "%s", buffer);
 172         }
 173 #else
 174         if (acpi_debugger_write_log(buffer) < 0) {
 175                 if (printk_get_level(buffer))
 176                         printk("%s", buffer);
 177                 else
 178                         printk(KERN_CONT "%s", buffer);
 179         }
 180 #endif
 181 }
 182
 183 #ifdef CONFIG_KEXEC
 184 static unsigned long acpi_rsdp;
 185 static int __init setup_acpi_rsdp(char *arg)
 186 {
 187         return kstrtoul(arg, 16, &acpi_rsdp);
 188 }
 189 early_param("acpi_rsdp", setup_acpi_rsdp);
 190 #endif
 191
 192 acpi_physical_address __init acpi_os_get_root_pointer(void)
 193 {
 194         acpi_physical_address pa;
 195
 196 #ifdef CONFIG_KEXEC
 197         if (acpi_rsdp)
 198                 return acpi_rsdp;
 199 #endif
 200         pa = acpi_arch_get_root_pointer();
 201         if (pa)
 202                 return pa;
 203
 204         if (efi_enabled(EFI_CONFIG_TABLES)) {
 205                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 206                         return efi.acpi20;
 207                 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 208                         return efi.acpi;
 209                 pr_err(PREFIX "System description tables not found\n");
 210         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 211                 acpi_find_root_pointer(&pa);
 212         }
 213
 214         return pa;
 215 }
 216
 217 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 218 static struct acpi_ioremap *
 219 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 220 {
 221         struct acpi_ioremap *map;
 222
 223         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 224                 if (map->phys <= phys &&
 225                     phys + size <= map->phys + map->size)
 226                         return map;
 227
 228         return NULL;
 229 }
 230
 231 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 232 static void __iomem *
 233 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 234 {
 235         struct acpi_ioremap *map;
 236
 237         map = acpi_map_lookup(phys, size);
 238         if (map)
 239                 return map->virt + (phys - map->phys);
 240
 241         return NULL;
 242 }
 243
 244 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 245 {
 246         struct acpi_ioremap *map;
 247         void __iomem *virt = NULL;
 248
 249         mutex_lock(&acpi_ioremap_lock);
 250         map = acpi_map_lookup(phys, size);
 251         if (map) {
 252                 virt = map->virt + (phys - map->phys);
 253                 map->refcount++;
 254         }
 255         mutex_unlock(&acpi_ioremap_lock);
 256         return virt;
 257 }
 258 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 259
 260 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 261 static struct acpi_ioremap *
 262 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 263 {
 264         struct acpi_ioremap *map;
 265
 266         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 267                 if (map->virt <= virt &&
 268                     virt + size <= map->virt + map->size)
 269                         return map;
 270
 271         return NULL;
 272 }
 273
 274 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 275 /* ioremap will take care of cache attributes */
 276 #define should_use_kmap(pfn)   0
 277 #else
 278 #define should_use_kmap(pfn)   page_is_ram(pfn)
 279 #endif
 280
 281 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 282 {
 283         unsigned long pfn;
 284
 285         pfn = pg_off >> PAGE_SHIFT;
 286         if (should_use_kmap(pfn)) {
 287                 if (pg_sz > PAGE_SIZE)
 288                         return NULL;
 289                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 290         } else
 291                 return acpi_os_ioremap(pg_off, pg_sz);
 292 }
 293
 294 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 295 {
 296         unsigned long pfn;
 297
 298         pfn = pg_off >> PAGE_SHIFT;
 299         if (should_use_kmap(pfn))
 300                 kunmap(pfn_to_page(pfn));
 301         else
 302                 iounmap(vaddr);
 303 }
 304
 305 /**
 306  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 307  * @phys: Start of the physical address range to map.
 308  * @size: Size of the physical address range to map.
 309  *
 310  * Look up the given physical address range in the list of existing ACPI memory
 311  * mappings.  If found, get a reference to it and return a pointer to it (its
 312  * virtual address).  If not found, map it, add it to that list and return a
 313  * pointer to it.
 314  *
 315  * During early init (when acpi_permanent_mmap has not been set yet) this
 316  * routine simply calls __acpi_map_table() to get the job done.
 317  */
 318 void __iomem *__ref
 319 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 320 {
 321         struct acpi_ioremap *map;
 322         void __iomem *virt;
 323         acpi_physical_address pg_off;
 324         acpi_size pg_sz;
 325
 326         if (phys > ULONG_MAX) {
 327                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 328                 return NULL;
 329         }
 330
 331         if (!acpi_permanent_mmap)
 332                 return __acpi_map_table((unsigned long)phys, size);
 333
 334         mutex_lock(&acpi_ioremap_lock);
 335         /* Check if there's a suitable mapping already. */
 336         map = acpi_map_lookup(phys, size);
 337         if (map) {
 338                 map->refcount++;
 339                 goto out;
 340         }
 341
 342         map = kzalloc(sizeof(*map), GFP_KERNEL);
 343         if (!map) {
 344                 mutex_unlock(&acpi_ioremap_lock);
 345                 return NULL;
 346         }
 347
 348         pg_off = round_down(phys, PAGE_SIZE);
 349         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 350         virt = acpi_map(pg_off, pg_sz);
 351         if (!virt) {
 352                 mutex_unlock(&acpi_ioremap_lock);
 353                 kfree(map);
 354                 return NULL;
 355         }
 356
 357         INIT_LIST_HEAD(&map->list);
 358         map->virt = virt;
 359         map->phys = pg_off;
 360         map->size = pg_sz;
 361         map->refcount = 1;
 362
 363         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 364
 365 out:
 366         mutex_unlock(&acpi_ioremap_lock);
 367         return map->virt + (phys - map->phys);
 368 }
 369 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 370
 371 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 372 {
 373         return (void *)acpi_os_map_iomem(phys, size);
 374 }
 375 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 376
 377 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 378 {
 379         if (!--map->refcount)
 380                 list_del_rcu(&map->list);
 381 }
 382
 383 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 384 {
 385         if (!map->refcount) {
 386                 synchronize_rcu_expedited();
 387                 acpi_unmap(map->phys, map->virt);
 388                 kfree(map);
 389         }
 390 }
 391
 392 /**
 393  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 394  * @virt: Start of the address range to drop a reference to.
 395  * @size: Size of the address range to drop a reference to.
 396  *
 397  * Look up the given virtual address range in the list of existing ACPI memory
 398  * mappings, drop a reference to it and unmap it if there are no more active
 399  * references to it.
 400  *
 401  * During early init (when acpi_permanent_mmap has not been set yet) this
 402  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 403  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 404  * here.
 405  */
 406 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 407 {
 408         struct acpi_ioremap *map;
 409
 410         if (!acpi_permanent_mmap) {
 411                 __acpi_unmap_table(virt, size);
 412                 return;
 413         }
 414
 415         mutex_lock(&acpi_ioremap_lock);
 416         map = acpi_map_lookup_virt(virt, size);
 417         if (!map) {
 418                 mutex_unlock(&acpi_ioremap_lock);
 419                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 420                 return;
 421         }
 422         acpi_os_drop_map_ref(map);
 423         mutex_unlock(&acpi_ioremap_lock);
 424
 425         acpi_os_map_cleanup(map);
 426 }
 427 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 428
 429 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 430 {
 431         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 432 }
 433 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 434
 435 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 436 {
 437         u64 addr;
 438         void __iomem *virt;
 439
 440         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 441                 return 0;
 442
 443         /* Handle possible alignment issues */
 444         memcpy(&addr, &gas->address, sizeof(addr));
 445         if (!addr || !gas->bit_width)
 446                 return -EINVAL;
 447
 448         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 449         if (!virt)
 450                 return -EIO;
 451
 452         return 0;
 453 }
 454 EXPORT_SYMBOL(acpi_os_map_generic_address);
 455
 456 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 457 {
 458         u64 addr;
 459         struct acpi_ioremap *map;
 460
 461         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 462                 return;
 463
 464         /* Handle possible alignment issues */
 465         memcpy(&addr, &gas->address, sizeof(addr));
 466         if (!addr || !gas->bit_width)
 467                 return;
 468
 469         mutex_lock(&acpi_ioremap_lock);
 470         map = acpi_map_lookup(addr, gas->bit_width / 8);
 471         if (!map) {
 472                 mutex_unlock(&acpi_ioremap_lock);
 473                 return;
 474         }
 475         acpi_os_drop_map_ref(map);
 476         mutex_unlock(&acpi_ioremap_lock);
 477
 478         acpi_os_map_cleanup(map);
 479 }
 480 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 481
 482 #ifdef ACPI_FUTURE_USAGE
 483 acpi_status
 484 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 485 {
 486         if (!phys || !virt)
 487                 return AE_BAD_PARAMETER;
 488
 489         *phys = virt_to_phys(virt);
 490
 491         return AE_OK;
 492 }
 493 #endif
 494
 495 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 496 static bool acpi_rev_override;
 497
 498 int __init acpi_rev_override_setup(char *str)
 499 {
 500         acpi_rev_override = true;
 501         return 1;
 502 }
 503 __setup("acpi_rev_override", acpi_rev_override_setup);
 504 #else
 505 #define acpi_rev_override       false
 506 #endif
 507
 508 #define ACPI_MAX_OVERRIDE_LEN 100
 509
 510 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 511
 512 acpi_status
 513 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 514                             acpi_string *new_val)
 515 {
 516         if (!init_val || !new_val)
 517                 return AE_BAD_PARAMETER;
 518
 519         *new_val = NULL;
 520         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 521                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 522                        acpi_os_name);
 523                 *new_val = acpi_os_name;
 524         }
 525
 526         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 527                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 528                 *new_val = (char *)5;
 529         }
 530
 531         return AE_OK;
 532 }
 533
 534 static irqreturn_t acpi_irq(int irq, void *dev_id)
 535 {
 536         u32 handled;
 537
 538         handled = (*acpi_irq_handler) (acpi_irq_context);
 539
 540         if (handled) {
 541                 acpi_irq_handled++;
 542                 return IRQ_HANDLED;
 543         } else {
 544                 acpi_irq_not_handled++;
 545                 return IRQ_NONE;
 546         }
 547 }
 548
 549 acpi_status
 550 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 551                                   void *context)
 552 {
 553         unsigned int irq;
 554
 555         acpi_irq_stats_init();
 556
 557         /*
 558          * ACPI interrupts different from the SCI in our copy of the FADT are
 559          * not supported.
 560          */
 561         if (gsi != acpi_gbl_FADT.sci_interrupt)
 562                 return AE_BAD_PARAMETER;
 563
 564         if (acpi_irq_handler)
 565                 return AE_ALREADY_ACQUIRED;
 566
 567         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 568                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 569                        gsi);
 570                 return AE_OK;
 571         }
 572
 573         acpi_irq_handler = handler;
 574         acpi_irq_context = context;
 575         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 576                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 577                 acpi_irq_handler = NULL;
 578                 return AE_NOT_ACQUIRED;
 579         }
 580         acpi_sci_irq = irq;
 581
 582         return AE_OK;
 583 }
 584
 585 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 586 {
 587         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 588                 return AE_BAD_PARAMETER;
 589
 590         free_irq(acpi_sci_irq, acpi_irq);
 591         acpi_irq_handler = NULL;
 592         acpi_sci_irq = INVALID_ACPI_IRQ;
 593
 594         return AE_OK;
 595 }
 596
 597 /*
 598  * Running in interpreter thread context, safe to sleep
 599  */
 600
 601 void acpi_os_sleep(u64 ms)
 602 {
 603         msleep(ms);
 604 }
 605
 606 void acpi_os_stall(u32 us)
 607 {
 608         while (us) {
 609                 u32 delay = 1000;
 610
 611                 if (delay > us)
 612                         delay = us;
 613                 udelay(delay);
 614                 touch_nmi_watchdog();
 615                 us -= delay;
 616         }
 617 }
 618
 619 /*
 620  * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
 621  * monotonically increasing timer with 100ns granularity. Do not use
 622  * ktime_get() to implement this function because this function may get
 623  * called after timekeeping has been suspended. Note: calling this function
 624  * after timekeeping has been suspended may lead to unexpected results
 625  * because when timekeeping is suspended the jiffies counter is not
 626  * incremented. See also timekeeping_suspend().
 627  */
 628 u64 acpi_os_get_timer(void)
 629 {
 630         return (get_jiffies_64() - INITIAL_JIFFIES) *
 631                 (ACPI_100NSEC_PER_SEC / HZ);
 632 }
 633
 634 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 635 {
 636         u32 dummy;
 637
 638         if (!value)
 639                 value = &dummy;
 640
 641         *value = 0;
 642         if (width <= 8) {
 643                 *(u8 *) value = inb(port);
 644         } else if (width <= 16) {
 645                 *(u16 *) value = inw(port);
 646         } else if (width <= 32) {
 647                 *(u32 *) value = inl(port);
 648         } else {
 649                 BUG();
 650         }
 651
 652         return AE_OK;
 653 }
 654
 655 EXPORT_SYMBOL(acpi_os_read_port);
 656
 657 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 658 {
 659         if (width <= 8) {
 660                 outb(value, port);
 661         } else if (width <= 16) {
 662                 outw(value, port);
 663         } else if (width <= 32) {
 664                 outl(value, port);
 665         } else {
 666                 BUG();
 667         }
 668
 669         return AE_OK;
 670 }
 671
 672 EXPORT_SYMBOL(acpi_os_write_port);
 673
 674 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 675 {
 676
 677         switch (width) {
 678         case 8:
 679                 *(u8 *) value = readb(virt_addr);
 680                 break;
 681         case 16:
 682                 *(u16 *) value = readw(virt_addr);
 683                 break;
 684         case 32:
 685                 *(u32 *) value = readl(virt_addr);
 686                 break;
 687         case 64:
 688                 *(u64 *) value = readq(virt_addr);
 689                 break;
 690         default:
 691                 return -EINVAL;
 692         }
 693
 694         return 0;
 695 }
 696
 697 acpi_status
 698 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 699 {
 700         void __iomem *virt_addr;
 701         unsigned int size = width / 8;
 702         bool unmap = false;
 703         u64 dummy;
 704         int error;
 705
 706         rcu_read_lock();
 707         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 708         if (!virt_addr) {
 709                 rcu_read_unlock();
 710                 virt_addr = acpi_os_ioremap(phys_addr, size);
 711                 if (!virt_addr)
 712                         return AE_BAD_ADDRESS;
 713                 unmap = true;
 714         }
 715
 716         if (!value)
 717                 value = &dummy;
 718
 719         error = acpi_os_read_iomem(virt_addr, value, width);
 720         BUG_ON(error);
 721
 722         if (unmap)
 723                 iounmap(virt_addr);
 724         else
 725                 rcu_read_unlock();
 726
 727         return AE_OK;
 728 }
 729
 730 acpi_status
 731 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 732 {
 733         void __iomem *virt_addr;
 734         unsigned int size = width / 8;
 735         bool unmap = false;
 736
 737         rcu_read_lock();
 738         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 739         if (!virt_addr) {
 740                 rcu_read_unlock();
 741                 virt_addr = acpi_os_ioremap(phys_addr, size);
 742                 if (!virt_addr)
 743                         return AE_BAD_ADDRESS;
 744                 unmap = true;
 745         }
 746
 747         switch (width) {
 748         case 8:
 749                 writeb(value, virt_addr);
 750                 break;
 751         case 16:
 752                 writew(value, virt_addr);
 753                 break;
 754         case 32:
 755                 writel(value, virt_addr);
 756                 break;
 757         case 64:
 758                 writeq(value, virt_addr);
 759                 break;
 760         default:
 761                 BUG();
 762         }
 763
 764         if (unmap)
 765                 iounmap(virt_addr);
 766         else
 767                 rcu_read_unlock();
 768
 769         return AE_OK;
 770 }
 771
 772 acpi_status
 773 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 774                                u64 *value, u32 width)
 775 {
 776         int result, size;
 777         u32 value32;
 778
 779         if (!value)
 780                 return AE_BAD_PARAMETER;
 781
 782         switch (width) {
 783         case 8:
 784                 size = 1;
 785                 break;
 786         case 16:
 787                 size = 2;
 788                 break;
 789         case 32:
 790                 size = 4;
 791                 break;
 792         default:
 793                 return AE_ERROR;
 794         }
 795
 796         result = raw_pci_read(pci_id->segment, pci_id->bus,
 797                                 PCI_DEVFN(pci_id->device, pci_id->function),
 798                                 reg, size, &value32);
 799         *value = value32;
 800
 801         return (result ? AE_ERROR : AE_OK);
 802 }
 803
 804 acpi_status
 805 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 806                                 u64 value, u32 width)
 807 {
 808         int result, size;
 809
 810         switch (width) {
 811         case 8:
 812                 size = 1;
 813                 break;
 814         case 16:
 815                 size = 2;
 816                 break;
 817         case 32:
 818                 size = 4;
 819                 break;
 820         default:
 821                 return AE_ERROR;
 822         }
 823
 824         result = raw_pci_write(pci_id->segment, pci_id->bus,
 825                                 PCI_DEVFN(pci_id->device, pci_id->function),
 826                                 reg, size, value);
 827
 828         return (result ? AE_ERROR : AE_OK);
 829 }
 830
 831 static void acpi_os_execute_deferred(struct work_struct *work)
 832 {
 833         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 834
 835         dpc->function(dpc->context);
 836         kfree(dpc);
 837 }
 838
 839 #ifdef CONFIG_ACPI_DEBUGGER
 840 static struct acpi_debugger acpi_debugger;
 841 static bool acpi_debugger_initialized;
 842
 843 int acpi_register_debugger(struct module *owner,
 844                            const struct acpi_debugger_ops *ops)
 845 {
 846         int ret = 0;
 847
 848         mutex_lock(&acpi_debugger.lock);
 849         if (acpi_debugger.ops) {
 850                 ret = -EBUSY;
 851                 goto err_lock;
 852         }
 853
 854         acpi_debugger.owner = owner;
 855         acpi_debugger.ops = ops;
 856
 857 err_lock:
 858         mutex_unlock(&acpi_debugger.lock);
 859         return ret;
 860 }
 861 EXPORT_SYMBOL(acpi_register_debugger);
 862
 863 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 864 {
 865         mutex_lock(&acpi_debugger.lock);
 866         if (ops == acpi_debugger.ops) {
 867                 acpi_debugger.ops = NULL;
 868                 acpi_debugger.owner = NULL;
 869         }
 870         mutex_unlock(&acpi_debugger.lock);
 871 }
 872 EXPORT_SYMBOL(acpi_unregister_debugger);
 873
 874 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 875 {
 876         int ret;
 877         int (*func)(acpi_osd_exec_callback, void *);
 878         struct module *owner;
 879
 880         if (!acpi_debugger_initialized)
 881                 return -ENODEV;
 882         mutex_lock(&acpi_debugger.lock);
 883         if (!acpi_debugger.ops) {
 884                 ret = -ENODEV;
 885                 goto err_lock;
 886         }
 887         if (!try_module_get(acpi_debugger.owner)) {
 888                 ret = -ENODEV;
 889                 goto err_lock;
 890         }
 891         func = acpi_debugger.ops->create_thread;
 892         owner = acpi_debugger.owner;
 893         mutex_unlock(&acpi_debugger.lock);
 894
 895         ret = func(function, context);
 896
 897         mutex_lock(&acpi_debugger.lock);
 898         module_put(owner);
 899 err_lock:
 900         mutex_unlock(&acpi_debugger.lock);
 901         return ret;
 902 }
 903
 904 ssize_t acpi_debugger_write_log(const char *msg)
 905 {
 906         ssize_t ret;
 907         ssize_t (*func)(const char *);
 908         struct module *owner;
 909
 910         if (!acpi_debugger_initialized)
 911                 return -ENODEV;
 912         mutex_lock(&acpi_debugger.lock);
 913         if (!acpi_debugger.ops) {
 914                 ret = -ENODEV;
 915                 goto err_lock;
 916         }
 917         if (!try_module_get(acpi_debugger.owner)) {
 918                 ret = -ENODEV;
 919                 goto err_lock;
 920         }
 921         func = acpi_debugger.ops->write_log;
 922         owner = acpi_debugger.owner;
 923         mutex_unlock(&acpi_debugger.lock);
 924
 925         ret = func(msg);
 926
 927         mutex_lock(&acpi_debugger.lock);
 928         module_put(owner);
 929 err_lock:
 930         mutex_unlock(&acpi_debugger.lock);
 931         return ret;
 932 }
 933
 934 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 935 {
 936         ssize_t ret;
 937         ssize_t (*func)(char *, size_t);
 938         struct module *owner;
 939
 940         if (!acpi_debugger_initialized)
 941                 return -ENODEV;
 942         mutex_lock(&acpi_debugger.lock);
 943         if (!acpi_debugger.ops) {
 944                 ret = -ENODEV;
 945                 goto err_lock;
 946         }
 947         if (!try_module_get(acpi_debugger.owner)) {
 948                 ret = -ENODEV;
 949                 goto err_lock;
 950         }
 951         func = acpi_debugger.ops->read_cmd;
 952         owner = acpi_debugger.owner;
 953         mutex_unlock(&acpi_debugger.lock);
 954
 955         ret = func(buffer, buffer_length);
 956
 957         mutex_lock(&acpi_debugger.lock);
 958         module_put(owner);
 959 err_lock:
 960         mutex_unlock(&acpi_debugger.lock);
 961         return ret;
 962 }
 963
 964 int acpi_debugger_wait_command_ready(void)
 965 {
 966         int ret;
 967         int (*func)(bool, char *, size_t);
 968         struct module *owner;
 969
 970         if (!acpi_debugger_initialized)
 971                 return -ENODEV;
 972         mutex_lock(&acpi_debugger.lock);
 973         if (!acpi_debugger.ops) {
 974                 ret = -ENODEV;
 975                 goto err_lock;
 976         }
 977         if (!try_module_get(acpi_debugger.owner)) {
 978                 ret = -ENODEV;
 979                 goto err_lock;
 980         }
 981         func = acpi_debugger.ops->wait_command_ready;
 982         owner = acpi_debugger.owner;
 983         mutex_unlock(&acpi_debugger.lock);
 984
 985         ret = func(acpi_gbl_method_executing,
 986                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
 987
 988         mutex_lock(&acpi_debugger.lock);
 989         module_put(owner);
 990 err_lock:
 991         mutex_unlock(&acpi_debugger.lock);
 992         return ret;
 993 }
 994
 995 int acpi_debugger_notify_command_complete(void)
 996 {
 997         int ret;
 998         int (*func)(void);
 999         struct module *owner;
1000
1001         if (!acpi_debugger_initialized)
1002                 return -ENODEV;
1003         mutex_lock(&acpi_debugger.lock);
1004         if (!acpi_debugger.ops) {
1005                 ret = -ENODEV;
1006                 goto err_lock;
1007         }
1008         if (!try_module_get(acpi_debugger.owner)) {
1009                 ret = -ENODEV;
1010                 goto err_lock;
1011         }
1012         func = acpi_debugger.ops->notify_command_complete;
1013         owner = acpi_debugger.owner;
1014         mutex_unlock(&acpi_debugger.lock);
1015
1016         ret = func();
1017
1018         mutex_lock(&acpi_debugger.lock);
1019         module_put(owner);
1020 err_lock:
1021         mutex_unlock(&acpi_debugger.lock);
1022         return ret;
1023 }
1024
1025 int __init acpi_debugger_init(void)
1026 {
1027         mutex_init(&acpi_debugger.lock);
1028         acpi_debugger_initialized = true;
1029         return 0;
1030 }
1031 #endif
1032
1033 /*******************************************************************************
1034  *
1035  * FUNCTION:    acpi_os_execute
1036  *
1037  * PARAMETERS:  Type               - Type of the callback
1038  *              Function           - Function to be executed
1039  *              Context            - Function parameters
1040  *
1041  * RETURN:      Status
1042  *
1043  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1044  *              immediately executes function on a separate thread.
1045  *
1046  ******************************************************************************/
1047
1048 acpi_status acpi_os_execute(acpi_execute_type type,
1049                             acpi_osd_exec_callback function, void *context)
1050 {
1051         acpi_status status = AE_OK;
1052         struct acpi_os_dpc *dpc;
1053         struct workqueue_struct *queue;
1054         int ret;
1055         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1056                           "Scheduling function [%p(%p)] for deferred execution.\n",
1057                           function, context));
1058
1059         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1060                 ret = acpi_debugger_create_thread(function, context);
1061                 if (ret) {
1062                         pr_err("Call to kthread_create() failed.\n");
1063                         status = AE_ERROR;
1064                 }
1065                 goto out_thread;
1066         }
1067
1068         /*
1069          * Allocate/initialize DPC structure.  Note that this memory will be
1070          * freed by the callee.  The kernel handles the work_struct list  in a
1071          * way that allows us to also free its memory inside the callee.
1072          * Because we may want to schedule several tasks with different
1073          * parameters we can't use the approach some kernel code uses of
1074          * having a static work_struct.
1075          */
1076
1077         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1078         if (!dpc)
1079                 return AE_NO_MEMORY;
1080
1081         dpc->function = function;
1082         dpc->context = context;
1083
1084         /*
1085          * To prevent lockdep from complaining unnecessarily, make sure that
1086          * there is a different static lockdep key for each workqueue by using
1087          * INIT_WORK() for each of them separately.
1088          */
1089         if (type == OSL_NOTIFY_HANDLER) {
1090                 queue = kacpi_notify_wq;
1091                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1092         } else if (type == OSL_GPE_HANDLER) {
1093                 queue = kacpid_wq;
1094                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1095         } else {
1096                 pr_err("Unsupported os_execute type %d.\n", type);
1097                 status = AE_ERROR;
1098         }
1099
1100         if (ACPI_FAILURE(status))
1101                 goto err_workqueue;
1102
1103         /*
1104          * On some machines, a software-initiated SMI causes corruption unless
1105          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1106          * typically it's done in GPE-related methods that are run via
1107          * workqueues, so we can avoid the known corruption cases by always
1108          * queueing on CPU 0.
1109          */
1110         ret = queue_work_on(0, queue, &dpc->work);
1111         if (!ret) {
1112                 printk(KERN_ERR PREFIX
1113                           "Call to queue_work() failed.\n");
1114                 status = AE_ERROR;
1115         }
1116 err_workqueue:
1117         if (ACPI_FAILURE(status))
1118                 kfree(dpc);
1119 out_thread:
1120         return status;
1121 }
1122 EXPORT_SYMBOL(acpi_os_execute);
1123
1124 void acpi_os_wait_events_complete(void)
1125 {
1126         /*
1127          * Make sure the GPE handler or the fixed event handler is not used
1128          * on another CPU after removal.
1129          */
1130         if (acpi_sci_irq_valid())
1131                 synchronize_hardirq(acpi_sci_irq);
1132         flush_workqueue(kacpid_wq);
1133         flush_workqueue(kacpi_notify_wq);
1134 }
1135 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1136
1137 struct acpi_hp_work {
1138         struct work_struct work;
1139         struct acpi_device *adev;
1140         u32 src;
1141 };
1142
1143 static void acpi_hotplug_work_fn(struct work_struct *work)
1144 {
1145         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1146
1147         acpi_os_wait_events_complete();
1148         acpi_device_hotplug(hpw->adev, hpw->src);
1149         kfree(hpw);
1150 }
1151
1152 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1153 {
1154         struct acpi_hp_work *hpw;
1155
1156         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1157                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1158                   adev, src));
1159
1160         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1161         if (!hpw)
1162                 return AE_NO_MEMORY;
1163
1164         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1165         hpw->adev = adev;
1166         hpw->src = src;
1167         /*
1168          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1169          * the hotplug code may call driver .remove() functions, which may
1170          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1171          * these workqueues.
1172          */
1173         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1174                 kfree(hpw);
1175                 return AE_ERROR;
1176         }
1177         return AE_OK;
1178 }
1179
1180 bool acpi_queue_hotplug_work(struct work_struct *work)
1181 {
1182         return queue_work(kacpi_hotplug_wq, work);
1183 }
1184
1185 acpi_status
1186 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1187 {
1188         struct semaphore *sem = NULL;
1189
1190         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1191         if (!sem)
1192                 return AE_NO_MEMORY;
1193
1194         sema_init(sem, initial_units);
1195
1196         *handle = (acpi_handle *) sem;
1197
1198         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1199                           *handle, initial_units));
1200
1201         return AE_OK;
1202 }
1203
1204 /*
1205  * TODO: A better way to delete semaphores?  Linux doesn't have a
1206  * 'delete_semaphore()' function -- may result in an invalid
1207  * pointer dereference for non-synchronized consumers.  Should
1208  * we at least check for blocked threads and signal/cancel them?
1209  */
1210
1211 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1212 {
1213         struct semaphore *sem = (struct semaphore *)handle;
1214
1215         if (!sem)
1216                 return AE_BAD_PARAMETER;
1217
1218         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1219
1220         BUG_ON(!list_empty(&sem->wait_list));
1221         kfree(sem);
1222         sem = NULL;
1223
1224         return AE_OK;
1225 }
1226
1227 /*
1228  * TODO: Support for units > 1?
1229  */
1230 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1231 {
1232         acpi_status status = AE_OK;
1233         struct semaphore *sem = (struct semaphore *)handle;
1234         long jiffies;
1235         int ret = 0;
1236
1237         if (!acpi_os_initialized)
1238                 return AE_OK;
1239
1240         if (!sem || (units < 1))
1241                 return AE_BAD_PARAMETER;
1242
1243         if (units > 1)
1244                 return AE_SUPPORT;
1245
1246         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1247                           handle, units, timeout));
1248
1249         if (timeout == ACPI_WAIT_FOREVER)
1250                 jiffies = MAX_SCHEDULE_TIMEOUT;
1251         else
1252                 jiffies = msecs_to_jiffies(timeout);
1253
1254         ret = down_timeout(sem, jiffies);
1255         if (ret)
1256                 status = AE_TIME;
1257
1258         if (ACPI_FAILURE(status)) {
1259                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1260                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1261                                   handle, units, timeout,
1262                                   acpi_format_exception(status)));
1263         } else {
1264                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1265                                   "Acquired semaphore[%p|%d|%d]", handle,
1266                                   units, timeout));
1267         }
1268
1269         return status;
1270 }
1271
1272 /*
1273  * TODO: Support for units > 1?
1274  */
1275 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1276 {
1277         struct semaphore *sem = (struct semaphore *)handle;
1278
1279         if (!acpi_os_initialized)
1280                 return AE_OK;
1281
1282         if (!sem || (units < 1))
1283                 return AE_BAD_PARAMETER;
1284
1285         if (units > 1)
1286                 return AE_SUPPORT;
1287
1288         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1289                           units));
1290
1291         up(sem);
1292
1293         return AE_OK;
1294 }
1295
1296 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1297 {
1298 #ifdef ENABLE_DEBUGGER
1299         if (acpi_in_debugger) {
1300                 u32 chars;
1301
1302                 kdb_read(buffer, buffer_length);
1303
1304                 /* remove the CR kdb includes */
1305                 chars = strlen(buffer) - 1;
1306                 buffer[chars] = '\0';
1307         }
1308 #else
1309         int ret;
1310
1311         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1312         if (ret < 0)
1313                 return AE_ERROR;
1314         if (bytes_read)
1315                 *bytes_read = ret;
1316 #endif
1317
1318         return AE_OK;
1319 }
1320 EXPORT_SYMBOL(acpi_os_get_line);
1321
1322 acpi_status acpi_os_wait_command_ready(void)
1323 {
1324         int ret;
1325
1326         ret = acpi_debugger_wait_command_ready();
1327         if (ret < 0)
1328                 return AE_ERROR;
1329         return AE_OK;
1330 }
1331
1332 acpi_status acpi_os_notify_command_complete(void)
1333 {
1334         int ret;
1335
1336         ret = acpi_debugger_notify_command_complete();
1337         if (ret < 0)
1338                 return AE_ERROR;
1339         return AE_OK;
1340 }
1341
1342 acpi_status acpi_os_signal(u32 function, void *info)
1343 {
1344         switch (function) {
1345         case ACPI_SIGNAL_FATAL:
1346                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1347                 break;
1348         case ACPI_SIGNAL_BREAKPOINT:
1349                 /*
1350                  * AML Breakpoint
1351                  * ACPI spec. says to treat it as a NOP unless
1352                  * you are debugging.  So if/when we integrate
1353                  * AML debugger into the kernel debugger its
1354                  * hook will go here.  But until then it is
1355                  * not useful to print anything on breakpoints.
1356                  */
1357                 break;
1358         default:
1359                 break;
1360         }
1361
1362         return AE_OK;
1363 }
1364
1365 static int __init acpi_os_name_setup(char *str)
1366 {
1367         char *p = acpi_os_name;
1368         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1369
1370         if (!str || !*str)
1371                 return 0;
1372
1373         for (; count-- && *str; str++) {
1374                 if (isalnum(*str) || *str == ' ' || *str == ':')
1375                         *p++ = *str;
1376                 else if (*str == '\'' || *str == '"')
1377                         continue;
1378                 else
1379                         break;
1380         }
1381         *p = 0;
1382
1383         return 1;
1384
1385 }
1386
1387 __setup("acpi_os_name=", acpi_os_name_setup);
1388
1389 /*
1390  * Disable the auto-serialization of named objects creation methods.
1391  *
1392  * This feature is enabled by default.  It marks the AML control methods
1393  * that contain the opcodes to create named objects as "Serialized".
1394  */
1395 static int __init acpi_no_auto_serialize_setup(char *str)
1396 {
1397         acpi_gbl_auto_serialize_methods = FALSE;
1398         pr_info("ACPI: auto-serialization disabled\n");
1399
1400         return 1;
1401 }
1402
1403 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1404
1405 /* Check of resource interference between native drivers and ACPI
1406  * OperationRegions (SystemIO and System Memory only).
1407  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1408  * in arbitrary AML code and can interfere with legacy drivers.
1409  * acpi_enforce_resources= can be set to:
1410  *
1411  *   - strict (default) (2)
1412  *     -> further driver trying to access the resources will not load
1413  *   - lax              (1)
1414  *     -> further driver trying to access the resources will load, but you
1415  *     get a system message that something might go wrong...
1416  *
1417  *   - no               (0)
1418  *     -> ACPI Operation Region resources will not be registered
1419  *
1420  */
1421 #define ENFORCE_RESOURCES_STRICT 2
1422 #define ENFORCE_RESOURCES_LAX    1
1423 #define ENFORCE_RESOURCES_NO     0
1424
1425 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1426
1427 static int __init acpi_enforce_resources_setup(char *str)
1428 {
1429         if (str == NULL || *str == '\0')
1430                 return 0;
1431
1432         if (!strcmp("strict", str))
1433                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1434         else if (!strcmp("lax", str))
1435                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1436         else if (!strcmp("no", str))
1437                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1438
1439         return 1;
1440 }
1441
1442 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1443
1444 /* Check for resource conflicts between ACPI OperationRegions and native
1445  * drivers */
1446 int acpi_check_resource_conflict(const struct resource *res)
1447 {
1448         acpi_adr_space_type space_id;
1449         acpi_size length;
1450         u8 warn = 0;
1451         int clash = 0;
1452
1453         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1454                 return 0;
1455         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1456                 return 0;
1457
1458         if (res->flags & IORESOURCE_IO)
1459                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1460         else
1461                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1462
1463         length = resource_size(res);
1464         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1465                 warn = 1;
1466         clash = acpi_check_address_range(space_id, res->start, length, warn);
1467
1468         if (clash) {
1469                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1470                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1471                                 printk(KERN_NOTICE "ACPI: This conflict may"
1472                                        " cause random problems and system"
1473                                        " instability\n");
1474                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1475                                " for this device, you should use it instead of"
1476                                " the native driver\n");
1477                 }
1478                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1479                         return -EBUSY;
1480         }
1481         return 0;
1482 }
1483 EXPORT_SYMBOL(acpi_check_resource_conflict);
1484
1485 int acpi_check_region(resource_size_t start, resource_size_t n,
1486                       const char *name)
1487 {
1488         struct resource res = {
1489                 .start = start,
1490                 .end   = start + n - 1,
1491                 .name  = name,
1492                 .flags = IORESOURCE_IO,
1493         };
1494
1495         return acpi_check_resource_conflict(&res);
1496 }
1497 EXPORT_SYMBOL(acpi_check_region);
1498
1499 static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1500                                               void *_res, void **return_value)
1501 {
1502         struct acpi_mem_space_context **mem_ctx;
1503         union acpi_operand_object *handler_obj;
1504         union acpi_operand_object *region_obj2;
1505         union acpi_operand_object *region_obj;
1506         struct resource *res = _res;
1507         acpi_status status;
1508
1509         region_obj = acpi_ns_get_attached_object(handle);
1510         if (!region_obj)
1511                 return AE_OK;
1512
1513         handler_obj = region_obj->region.handler;
1514         if (!handler_obj)
1515                 return AE_OK;
1516
1517         if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1518                 return AE_OK;
1519
1520         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1521                 return AE_OK;
1522
1523         region_obj2 = acpi_ns_get_secondary_object(region_obj);
1524         if (!region_obj2)
1525                 return AE_OK;
1526
1527         mem_ctx = (void *)&region_obj2->extra.region_context;
1528
1529         if (!(mem_ctx[0]->address >= res->start &&
1530               mem_ctx[0]->address < res->end))
1531                 return AE_OK;
1532
1533         status = handler_obj->address_space.setup(region_obj,
1534                                                   ACPI_REGION_DEACTIVATE,
1535                                                   NULL, (void **)mem_ctx);
1536         if (ACPI_SUCCESS(status))
1537                 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1538
1539         return status;
1540 }
1541
1542 /**
1543  * acpi_release_memory - Release any mappings done to a memory region
1544  * @handle: Handle to namespace node
1545  * @res: Memory resource
1546  * @level: A level that terminates the search
1547  *
1548  * Walks through @handle and unmaps all SystemMemory Operation Regions that
1549  * overlap with @res and that have already been activated (mapped).
1550  *
1551  * This is a helper that allows drivers to place special requirements on memory
1552  * region that may overlap with operation regions, primarily allowing them to
1553  * safely map the region as non-cached memory.
1554  *
1555  * The unmapped Operation Regions will be automatically remapped next time they
1556  * are called, so the drivers do not need to do anything else.
1557  */
1558 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1559                                 u32 level)
1560 {
1561         if (!(res->flags & IORESOURCE_MEM))
1562                 return AE_TYPE;
1563
1564         return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1565                                    acpi_deactivate_mem_region, NULL, res, NULL);
1566 }
1567 EXPORT_SYMBOL_GPL(acpi_release_memory);
1568
1569 /*
1570  * Let drivers know whether the resource checks are effective
1571  */
1572 int acpi_resources_are_enforced(void)
1573 {
1574         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1575 }
1576 EXPORT_SYMBOL(acpi_resources_are_enforced);
1577
1578 /*
1579  * Deallocate the memory for a spinlock.
1580  */
1581 void acpi_os_delete_lock(acpi_spinlock handle)
1582 {
1583         ACPI_FREE(handle);
1584 }
1585
1586 /*
1587  * Acquire a spinlock.
1588  *
1589  * handle is a pointer to the spinlock_t.
1590  */
1591
1592 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1593 {
1594         acpi_cpu_flags flags;
1595         spin_lock_irqsave(lockp, flags);
1596         return flags;
1597 }
1598
1599 /*
1600  * Release a spinlock. See above.
1601  */
1602
1603 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1604 {
1605         spin_unlock_irqrestore(lockp, flags);
1606 }
1607
1608 #ifndef ACPI_USE_LOCAL_CACHE
1609
1610 /*******************************************************************************
1611  *
1612  * FUNCTION:    acpi_os_create_cache
1613  *
1614  * PARAMETERS:  name      - Ascii name for the cache
1615  *              size      - Size of each cached object
1616  *              depth     - Maximum depth of the cache (in objects) <ignored>
1617  *              cache     - Where the new cache object is returned
1618  *
1619  * RETURN:      status
1620  *
1621  * DESCRIPTION: Create a cache object
1622  *
1623  ******************************************************************************/
1624
1625 acpi_status
1626 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1627 {
1628         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1629         if (*cache == NULL)
1630                 return AE_ERROR;
1631         else
1632                 return AE_OK;
1633 }
1634
1635 /*******************************************************************************
1636  *
1637  * FUNCTION:    acpi_os_purge_cache
1638  *
1639  * PARAMETERS:  Cache           - Handle to cache object
1640  *
1641  * RETURN:      Status
1642  *
1643  * DESCRIPTION: Free all objects within the requested cache.
1644  *
1645  ******************************************************************************/
1646
1647 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1648 {
1649         kmem_cache_shrink(cache);
1650         return (AE_OK);
1651 }
1652
1653 /*******************************************************************************
1654  *
1655  * FUNCTION:    acpi_os_delete_cache
1656  *
1657  * PARAMETERS:  Cache           - Handle to cache object
1658  *
1659  * RETURN:      Status
1660  *
1661  * DESCRIPTION: Free all objects within the requested cache and delete the
1662  *              cache object.
1663  *
1664  ******************************************************************************/
1665
1666 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1667 {
1668         kmem_cache_destroy(cache);
1669         return (AE_OK);
1670 }
1671
1672 /*******************************************************************************
1673  *
1674  * FUNCTION:    acpi_os_release_object
1675  *
1676  * PARAMETERS:  Cache       - Handle to cache object
1677  *              Object      - The object to be released
1678  *
1679  * RETURN:      None
1680  *
1681  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1682  *              the object is deleted.
1683  *
1684  ******************************************************************************/
1685
1686 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1687 {
1688         kmem_cache_free(cache, object);
1689         return (AE_OK);
1690 }
1691 #endif
1692
1693 static int __init acpi_no_static_ssdt_setup(char *s)
1694 {
1695         acpi_gbl_disable_ssdt_table_install = TRUE;
1696         pr_info("ACPI: static SSDT installation disabled\n");
1697
1698         return 0;
1699 }
1700
1701 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1702
1703 static int __init acpi_disable_return_repair(char *s)
1704 {
1705         printk(KERN_NOTICE PREFIX
1706                "ACPI: Predefined validation mechanism disabled\n");
1707         acpi_gbl_disable_auto_repair = TRUE;
1708
1709         return 1;
1710 }
1711
1712 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1713
1714 acpi_status __init acpi_os_initialize(void)
1715 {
1716         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1717         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1718         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1719         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1720         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1721                 /*
1722                  * Use acpi_os_map_generic_address to pre-map the reset
1723                  * register if it's in system memory.
1724                  */
1725                 int rv;
1726
1727                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1728                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1729         }
1730         acpi_os_initialized = true;
1731
1732         return AE_OK;
1733 }
1734
1735 acpi_status __init acpi_os_initialize1(void)
1736 {
1737         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1738         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1739         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1740         BUG_ON(!kacpid_wq);
1741         BUG_ON(!kacpi_notify_wq);
1742         BUG_ON(!kacpi_hotplug_wq);
1743         acpi_osi_init();
1744         return AE_OK;
1745 }
1746
1747 acpi_status acpi_os_terminate(void)
1748 {
1749         if (acpi_irq_handler) {
1750                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1751                                                  acpi_irq_handler);
1752         }
1753
1754         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1755         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1756         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1757         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1758         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1759                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1760
1761         destroy_workqueue(kacpid_wq);
1762         destroy_workqueue(kacpi_notify_wq);
1763         destroy_workqueue(kacpi_hotplug_wq);
1764
1765         return AE_OK;
1766 }
1767
1768 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1769                                   u32 pm1b_control)
1770 {
1771         int rc = 0;
1772         if (__acpi_os_prepare_sleep)
1773                 rc = __acpi_os_prepare_sleep(sleep_state,
1774                                              pm1a_control, pm1b_control);
1775         if (rc < 0)
1776                 return AE_ERROR;
1777         else if (rc > 0)
1778                 return AE_CTRL_TERMINATE;
1779
1780         return AE_OK;
1781 }
1782
1783 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1784                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1785 {
1786         __acpi_os_prepare_sleep = func;
1787 }
1788
1789 #if (ACPI_REDUCED_HARDWARE)
1790 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1791                                   u32 val_b)
1792 {
1793         int rc = 0;
1794         if (__acpi_os_prepare_extended_sleep)
1795                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1796                                              val_a, val_b);
1797         if (rc < 0)
1798                 return AE_ERROR;
1799         else if (rc > 0)
1800                 return AE_CTRL_TERMINATE;
1801
1802         return AE_OK;
1803 }
1804 #else
1805 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1806                                   u32 val_b)
1807 {
1808         return AE_OK;
1809 }
1810 #endif
1811
1812 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1813                                u32 val_a, u32 val_b))
1814 {
1815         __acpi_os_prepare_extended_sleep = func;
1816 }
1817
1818 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1819                                 u32 reg_a_value, u32 reg_b_value)
1820 {
1821         acpi_status status;
1822
1823         if (acpi_gbl_reduced_hardware)
1824                 status = acpi_os_prepare_extended_sleep(sleep_state,
1825                                                         reg_a_value,
1826                                                         reg_b_value);
1827         else
1828                 status = acpi_os_prepare_sleep(sleep_state,
1829                                                reg_a_value, reg_b_value);
1830         return status;
1831 }