drivers/acpi/osl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   4  *
   5  *  Copyright (C) 2000       Andrew Henroid
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *  Copyright (c) 2008 Intel Corporation
   9  *   Author: Matthew Wilcox <willy@linux.intel.com>
  10  */
  11
  12 #define pr_fmt(fmt) "ACPI: OSL: " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/mm.h>
  18 #include <linux/highmem.h>
  19 #include <linux/lockdep.h>
  20 #include <linux/pci.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/kmod.h>
  23 #include <linux/delay.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/nmi.h>
  26 #include <linux/acpi.h>
  27 #include <linux/efi.h>
  28 #include <linux/ioport.h>
  29 #include <linux/list.h>
  30 #include <linux/jiffies.h>
  31 #include <linux/semaphore.h>
  32 #include <linux/security.h>
  33
  34 #include <asm/io.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/io-64-nonatomic-lo-hi.h>
  37
  38 #include "acpica/accommon.h"
  39 #include "internal.h"
  40
  41 /* Definitions for ACPI_DEBUG_PRINT() */
  42 #define _COMPONENT              ACPI_OS_SERVICES
  43 ACPI_MODULE_NAME("osl");
  44
  45 struct acpi_os_dpc {
  46         acpi_osd_exec_callback function;
  47         void *context;
  48         struct work_struct work;
  49 };
  50
  51 #ifdef ENABLE_DEBUGGER
  52 #include <linux/kdb.h>
  53
  54 /* stuff for debugger support */
  55 int acpi_in_debugger;
  56 EXPORT_SYMBOL(acpi_in_debugger);
  57 #endif                          /*ENABLE_DEBUGGER */
  58
  59 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  60                                       u32 pm1b_ctrl);
  61 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  62                                       u32 val_b);
  63
  64 static acpi_osd_handler acpi_irq_handler;
  65 static void *acpi_irq_context;
  66 static struct workqueue_struct *kacpid_wq;
  67 static struct workqueue_struct *kacpi_notify_wq;
  68 static struct workqueue_struct *kacpi_hotplug_wq;
  69 static bool acpi_os_initialized;
  70 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  71 bool acpi_permanent_mmap = false;
  72
  73 /*
  74  * This list of permanent mappings is for memory that may be accessed from
  75  * interrupt context, where we can't do the ioremap().
  76  */
  77 struct acpi_ioremap {
  78         struct list_head list;
  79         void __iomem *virt;
  80         acpi_physical_address phys;
  81         acpi_size size;
  82         union {
  83                 unsigned long refcount;
  84                 struct rcu_work rwork;
  85         } track;
  86 };
  87
  88 static LIST_HEAD(acpi_ioremaps);
  89 static DEFINE_MUTEX(acpi_ioremap_lock);
  90 #define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
  91
  92 static void __init acpi_request_region (struct acpi_generic_address *gas,
  93         unsigned int length, char *desc)
  94 {
  95         u64 addr;
  96
  97         /* Handle possible alignment issues */
  98         memcpy(&addr, &gas->address, sizeof(addr));
  99         if (!addr || !length)
 100                 return;
 101
 102         /* Resources are never freed */
 103         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 104                 request_region(addr, length, desc);
 105         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 106                 request_mem_region(addr, length, desc);
 107 }
 108
 109 static int __init acpi_reserve_resources(void)
 110 {
 111         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 112                 "ACPI PM1a_EVT_BLK");
 113
 114         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 115                 "ACPI PM1b_EVT_BLK");
 116
 117         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 118                 "ACPI PM1a_CNT_BLK");
 119
 120         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 121                 "ACPI PM1b_CNT_BLK");
 122
 123         if (acpi_gbl_FADT.pm_timer_length == 4)
 124                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 125
 126         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 127                 "ACPI PM2_CNT_BLK");
 128
 129         /* Length of GPE blocks must be a non-negative multiple of 2 */
 130
 131         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 132                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 133                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 134
 135         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 136                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 137                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 138
 139         return 0;
 140 }
 141 fs_initcall_sync(acpi_reserve_resources);
 142
 143 void acpi_os_printf(const char *fmt, ...)
 144 {
 145         va_list args;
 146         va_start(args, fmt);
 147         acpi_os_vprintf(fmt, args);
 148         va_end(args);
 149 }
 150 EXPORT_SYMBOL(acpi_os_printf);
 151
 152 void __printf(1, 0) acpi_os_vprintf(const char *fmt, va_list args)
 153 {
 154         static char buffer[512];
 155
 156         vsprintf(buffer, fmt, args);
 157
 158 #ifdef ENABLE_DEBUGGER
 159         if (acpi_in_debugger) {
 160                 kdb_printf("%s", buffer);
 161         } else {
 162                 if (printk_get_level(buffer))
 163                         printk("%s", buffer);
 164                 else
 165                         printk(KERN_CONT "%s", buffer);
 166         }
 167 #else
 168         if (acpi_debugger_write_log(buffer) < 0) {
 169                 if (printk_get_level(buffer))
 170                         printk("%s", buffer);
 171                 else
 172                         printk(KERN_CONT "%s", buffer);
 173         }
 174 #endif
 175 }
 176
 177 #ifdef CONFIG_KEXEC
 178 static unsigned long acpi_rsdp;
 179 static int __init setup_acpi_rsdp(char *arg)
 180 {
 181         return kstrtoul(arg, 16, &acpi_rsdp);
 182 }
 183 early_param("acpi_rsdp", setup_acpi_rsdp);
 184 #endif
 185
 186 acpi_physical_address __init acpi_os_get_root_pointer(void)
 187 {
 188         acpi_physical_address pa;
 189
 190 #ifdef CONFIG_KEXEC
 191         /*
 192          * We may have been provided with an RSDP on the command line,
 193          * but if a malicious user has done so they may be pointing us
 194          * at modified ACPI tables that could alter kernel behaviour -
 195          * so, we check the lockdown status before making use of
 196          * it. If we trust it then also stash it in an architecture
 197          * specific location (if appropriate) so it can be carried
 198          * over further kexec()s.
 199          */
 200         if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
 201                 acpi_arch_set_root_pointer(acpi_rsdp);
 202                 return acpi_rsdp;
 203         }
 204 #endif
 205         pa = acpi_arch_get_root_pointer();
 206         if (pa)
 207                 return pa;
 208
 209         if (efi_enabled(EFI_CONFIG_TABLES)) {
 210                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 211                         return efi.acpi20;
 212                 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 213                         return efi.acpi;
 214                 pr_err("System description tables not found\n");
 215         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 216                 acpi_find_root_pointer(&pa);
 217         }
 218
 219         return pa;
 220 }
 221
 222 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 223 static struct acpi_ioremap *
 224 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 225 {
 226         struct acpi_ioremap *map;
 227
 228         list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
 229                 if (map->phys <= phys &&
 230                     phys + size <= map->phys + map->size)
 231                         return map;
 232
 233         return NULL;
 234 }
 235
 236 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 237 static void __iomem *
 238 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 239 {
 240         struct acpi_ioremap *map;
 241
 242         map = acpi_map_lookup(phys, size);
 243         if (map)
 244                 return map->virt + (phys - map->phys);
 245
 246         return NULL;
 247 }
 248
 249 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 250 {
 251         struct acpi_ioremap *map;
 252         void __iomem *virt = NULL;
 253
 254         mutex_lock(&acpi_ioremap_lock);
 255         map = acpi_map_lookup(phys, size);
 256         if (map) {
 257                 virt = map->virt + (phys - map->phys);
 258                 map->track.refcount++;
 259         }
 260         mutex_unlock(&acpi_ioremap_lock);
 261         return virt;
 262 }
 263 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 264
 265 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 266 static struct acpi_ioremap *
 267 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 268 {
 269         struct acpi_ioremap *map;
 270
 271         list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
 272                 if (map->virt <= virt &&
 273                     virt + size <= map->virt + map->size)
 274                         return map;
 275
 276         return NULL;
 277 }
 278
 279 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 280 /* ioremap will take care of cache attributes */
 281 #define should_use_kmap(pfn)   0
 282 #else
 283 #define should_use_kmap(pfn)   page_is_ram(pfn)
 284 #endif
 285
 286 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 287 {
 288         unsigned long pfn;
 289
 290         pfn = pg_off >> PAGE_SHIFT;
 291         if (should_use_kmap(pfn)) {
 292                 if (pg_sz > PAGE_SIZE)
 293                         return NULL;
 294                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 295         } else
 296                 return acpi_os_ioremap(pg_off, pg_sz);
 297 }
 298
 299 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 300 {
 301         unsigned long pfn;
 302
 303         pfn = pg_off >> PAGE_SHIFT;
 304         if (should_use_kmap(pfn))
 305                 kunmap(pfn_to_page(pfn));
 306         else
 307                 iounmap(vaddr);
 308 }
 309
 310 /**
 311  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 312  * @phys: Start of the physical address range to map.
 313  * @size: Size of the physical address range to map.
 314  *
 315  * Look up the given physical address range in the list of existing ACPI memory
 316  * mappings.  If found, get a reference to it and return a pointer to it (its
 317  * virtual address).  If not found, map it, add it to that list and return a
 318  * pointer to it.
 319  *
 320  * During early init (when acpi_permanent_mmap has not been set yet) this
 321  * routine simply calls __acpi_map_table() to get the job done.
 322  */
 323 void __iomem __ref
 324 *acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 325 {
 326         struct acpi_ioremap *map;
 327         void __iomem *virt;
 328         acpi_physical_address pg_off;
 329         acpi_size pg_sz;
 330
 331         if (phys > ULONG_MAX) {
 332                 pr_err("Cannot map memory that high: 0x%llx\n", phys);
 333                 return NULL;
 334         }
 335
 336         if (!acpi_permanent_mmap)
 337                 return __acpi_map_table((unsigned long)phys, size);
 338
 339         mutex_lock(&acpi_ioremap_lock);
 340         /* Check if there's a suitable mapping already. */
 341         map = acpi_map_lookup(phys, size);
 342         if (map) {
 343                 map->track.refcount++;
 344                 goto out;
 345         }
 346
 347         map = kzalloc(sizeof(*map), GFP_KERNEL);
 348         if (!map) {
 349                 mutex_unlock(&acpi_ioremap_lock);
 350                 return NULL;
 351         }
 352
 353         pg_off = round_down(phys, PAGE_SIZE);
 354         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 355         virt = acpi_map(phys, size);
 356         if (!virt) {
 357                 mutex_unlock(&acpi_ioremap_lock);
 358                 kfree(map);
 359                 return NULL;
 360         }
 361
 362         INIT_LIST_HEAD(&map->list);
 363         map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
 364         map->phys = pg_off;
 365         map->size = pg_sz;
 366         map->track.refcount = 1;
 367
 368         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 369
 370 out:
 371         mutex_unlock(&acpi_ioremap_lock);
 372         return map->virt + (phys - map->phys);
 373 }
 374 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 375
 376 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 377 {
 378         return (void *)acpi_os_map_iomem(phys, size);
 379 }
 380 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 381
 382 static void acpi_os_map_remove(struct work_struct *work)
 383 {
 384         struct acpi_ioremap *map = container_of(to_rcu_work(work),
 385                                                 struct acpi_ioremap,
 386                                                 track.rwork);
 387
 388         acpi_unmap(map->phys, map->virt);
 389         kfree(map);
 390 }
 391
 392 /* Must be called with mutex_lock(&acpi_ioremap_lock) */
 393 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 394 {
 395         if (--map->track.refcount)
 396                 return;
 397
 398         list_del_rcu(&map->list);
 399
 400         INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
 401         queue_rcu_work(system_wq, &map->track.rwork);
 402 }
 403
 404 /**
 405  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 406  * @virt: Start of the address range to drop a reference to.
 407  * @size: Size of the address range to drop a reference to.
 408  *
 409  * Look up the given virtual address range in the list of existing ACPI memory
 410  * mappings, drop a reference to it and if there are no more active references
 411  * to it, queue it up for later removal.
 412  *
 413  * During early init (when acpi_permanent_mmap has not been set yet) this
 414  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 415  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 416  * here.
 417  */
 418 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 419 {
 420         struct acpi_ioremap *map;
 421
 422         if (!acpi_permanent_mmap) {
 423                 __acpi_unmap_table(virt, size);
 424                 return;
 425         }
 426
 427         mutex_lock(&acpi_ioremap_lock);
 428
 429         map = acpi_map_lookup_virt(virt, size);
 430         if (!map) {
 431                 mutex_unlock(&acpi_ioremap_lock);
 432                 WARN(true, "ACPI: %s: bad address %p\n", __func__, virt);
 433                 return;
 434         }
 435         acpi_os_drop_map_ref(map);
 436
 437         mutex_unlock(&acpi_ioremap_lock);
 438 }
 439 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 440
 441 /**
 442  * acpi_os_unmap_memory - Drop a memory mapping reference.
 443  * @virt: Start of the address range to drop a reference to.
 444  * @size: Size of the address range to drop a reference to.
 445  */
 446 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 447 {
 448         acpi_os_unmap_iomem((void __iomem *)virt, size);
 449 }
 450 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 451
 452 void __iomem *acpi_os_map_generic_address(struct acpi_generic_address *gas)
 453 {
 454         u64 addr;
 455
 456         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 457                 return NULL;
 458
 459         /* Handle possible alignment issues */
 460         memcpy(&addr, &gas->address, sizeof(addr));
 461         if (!addr || !gas->bit_width)
 462                 return NULL;
 463
 464         return acpi_os_map_iomem(addr, gas->bit_width / 8);
 465 }
 466 EXPORT_SYMBOL(acpi_os_map_generic_address);
 467
 468 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 469 {
 470         u64 addr;
 471         struct acpi_ioremap *map;
 472
 473         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 474                 return;
 475
 476         /* Handle possible alignment issues */
 477         memcpy(&addr, &gas->address, sizeof(addr));
 478         if (!addr || !gas->bit_width)
 479                 return;
 480
 481         mutex_lock(&acpi_ioremap_lock);
 482
 483         map = acpi_map_lookup(addr, gas->bit_width / 8);
 484         if (!map) {
 485                 mutex_unlock(&acpi_ioremap_lock);
 486                 return;
 487         }
 488         acpi_os_drop_map_ref(map);
 489
 490         mutex_unlock(&acpi_ioremap_lock);
 491 }
 492 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 493
 494 #ifdef ACPI_FUTURE_USAGE
 495 acpi_status
 496 acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
 497 {
 498         if (!phys || !virt)
 499                 return AE_BAD_PARAMETER;
 500
 501         *phys = virt_to_phys(virt);
 502
 503         return AE_OK;
 504 }
 505 #endif
 506
 507 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 508 static bool acpi_rev_override;
 509
 510 int __init acpi_rev_override_setup(char *str)
 511 {
 512         acpi_rev_override = true;
 513         return 1;
 514 }
 515 __setup("acpi_rev_override", acpi_rev_override_setup);
 516 #else
 517 #define acpi_rev_override       false
 518 #endif
 519
 520 #define ACPI_MAX_OVERRIDE_LEN 100
 521
 522 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 523
 524 acpi_status
 525 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 526                             acpi_string *new_val)
 527 {
 528         if (!init_val || !new_val)
 529                 return AE_BAD_PARAMETER;
 530
 531         *new_val = NULL;
 532         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 533                 pr_info("Overriding _OS definition to '%s'\n", acpi_os_name);
 534                 *new_val = acpi_os_name;
 535         }
 536
 537         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 538                 pr_info("Overriding _REV return value to 5\n");
 539                 *new_val = (char *)5;
 540         }
 541
 542         return AE_OK;
 543 }
 544
 545 static irqreturn_t acpi_irq(int irq, void *dev_id)
 546 {
 547         if ((*acpi_irq_handler)(acpi_irq_context)) {
 548                 acpi_irq_handled++;
 549                 return IRQ_HANDLED;
 550         } else {
 551                 acpi_irq_not_handled++;
 552                 return IRQ_NONE;
 553         }
 554 }
 555
 556 acpi_status
 557 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 558                                   void *context)
 559 {
 560         unsigned int irq;
 561
 562         acpi_irq_stats_init();
 563
 564         /*
 565          * ACPI interrupts different from the SCI in our copy of the FADT are
 566          * not supported.
 567          */
 568         if (gsi != acpi_gbl_FADT.sci_interrupt)
 569                 return AE_BAD_PARAMETER;
 570
 571         if (acpi_irq_handler)
 572                 return AE_ALREADY_ACQUIRED;
 573
 574         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 575                 pr_err("SCI (ACPI GSI %d) not registered\n", gsi);
 576                 return AE_OK;
 577         }
 578
 579         acpi_irq_handler = handler;
 580         acpi_irq_context = context;
 581         if (request_threaded_irq(irq, NULL, acpi_irq, IRQF_SHARED | IRQF_ONESHOT,
 582                                  "acpi", acpi_irq)) {
 583                 pr_err("SCI (IRQ%d) allocation failed\n", irq);
 584                 acpi_irq_handler = NULL;
 585                 return AE_NOT_ACQUIRED;
 586         }
 587         acpi_sci_irq = irq;
 588
 589         return AE_OK;
 590 }
 591
 592 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 593 {
 594         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 595                 return AE_BAD_PARAMETER;
 596
 597         free_irq(acpi_sci_irq, acpi_irq);
 598         acpi_irq_handler = NULL;
 599         acpi_sci_irq = INVALID_ACPI_IRQ;
 600
 601         return AE_OK;
 602 }
 603
 604 /*
 605  * Running in interpreter thread context, safe to sleep
 606  */
 607
 608 void acpi_os_sleep(u64 ms)
 609 {
 610         msleep(ms);
 611 }
 612
 613 void acpi_os_stall(u32 us)
 614 {
 615         while (us) {
 616                 u32 delay = 1000;
 617
 618                 if (delay > us)
 619                         delay = us;
 620                 udelay(delay);
 621                 touch_nmi_watchdog();
 622                 us -= delay;
 623         }
 624 }
 625
 626 /*
 627  * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
 628  * monotonically increasing timer with 100ns granularity. Do not use
 629  * ktime_get() to implement this function because this function may get
 630  * called after timekeeping has been suspended. Note: calling this function
 631  * after timekeeping has been suspended may lead to unexpected results
 632  * because when timekeeping is suspended the jiffies counter is not
 633  * incremented. See also timekeeping_suspend().
 634  */
 635 u64 acpi_os_get_timer(void)
 636 {
 637         return (get_jiffies_64() - INITIAL_JIFFIES) *
 638                 (ACPI_100NSEC_PER_SEC / HZ);
 639 }
 640
 641 acpi_status acpi_os_read_port(acpi_io_address port, u32 *value, u32 width)
 642 {
 643         u32 dummy;
 644
 645         if (value)
 646                 *value = 0;
 647         else
 648                 value = &dummy;
 649
 650         if (width <= 8) {
 651                 *value = inb(port);
 652         } else if (width <= 16) {
 653                 *value = inw(port);
 654         } else if (width <= 32) {
 655                 *value = inl(port);
 656         } else {
 657                 pr_debug("%s: Access width %d not supported\n", __func__, width);
 658                 return AE_BAD_PARAMETER;
 659         }
 660
 661         return AE_OK;
 662 }
 663
 664 EXPORT_SYMBOL(acpi_os_read_port);
 665
 666 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 667 {
 668         if (width <= 8) {
 669                 outb(value, port);
 670         } else if (width <= 16) {
 671                 outw(value, port);
 672         } else if (width <= 32) {
 673                 outl(value, port);
 674         } else {
 675                 pr_debug("%s: Access width %d not supported\n", __func__, width);
 676                 return AE_BAD_PARAMETER;
 677         }
 678
 679         return AE_OK;
 680 }
 681
 682 EXPORT_SYMBOL(acpi_os_write_port);
 683
 684 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 685 {
 686
 687         switch (width) {
 688         case 8:
 689                 *(u8 *) value = readb(virt_addr);
 690                 break;
 691         case 16:
 692                 *(u16 *) value = readw(virt_addr);
 693                 break;
 694         case 32:
 695                 *(u32 *) value = readl(virt_addr);
 696                 break;
 697         case 64:
 698                 *(u64 *) value = readq(virt_addr);
 699                 break;
 700         default:
 701                 return -EINVAL;
 702         }
 703
 704         return 0;
 705 }
 706
 707 acpi_status
 708 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 709 {
 710         void __iomem *virt_addr;
 711         unsigned int size = width / 8;
 712         bool unmap = false;
 713         u64 dummy;
 714         int error;
 715
 716         rcu_read_lock();
 717         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 718         if (!virt_addr) {
 719                 rcu_read_unlock();
 720                 virt_addr = acpi_os_ioremap(phys_addr, size);
 721                 if (!virt_addr)
 722                         return AE_BAD_ADDRESS;
 723                 unmap = true;
 724         }
 725
 726         if (!value)
 727                 value = &dummy;
 728
 729         error = acpi_os_read_iomem(virt_addr, value, width);
 730         BUG_ON(error);
 731
 732         if (unmap)
 733                 iounmap(virt_addr);
 734         else
 735                 rcu_read_unlock();
 736
 737         return AE_OK;
 738 }
 739
 740 acpi_status
 741 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 742 {
 743         void __iomem *virt_addr;
 744         unsigned int size = width / 8;
 745         bool unmap = false;
 746
 747         rcu_read_lock();
 748         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 749         if (!virt_addr) {
 750                 rcu_read_unlock();
 751                 virt_addr = acpi_os_ioremap(phys_addr, size);
 752                 if (!virt_addr)
 753                         return AE_BAD_ADDRESS;
 754                 unmap = true;
 755         }
 756
 757         switch (width) {
 758         case 8:
 759                 writeb(value, virt_addr);
 760                 break;
 761         case 16:
 762                 writew(value, virt_addr);
 763                 break;
 764         case 32:
 765                 writel(value, virt_addr);
 766                 break;
 767         case 64:
 768                 writeq(value, virt_addr);
 769                 break;
 770         default:
 771                 BUG();
 772         }
 773
 774         if (unmap)
 775                 iounmap(virt_addr);
 776         else
 777                 rcu_read_unlock();
 778
 779         return AE_OK;
 780 }
 781
 782 #ifdef CONFIG_PCI
 783 acpi_status
 784 acpi_os_read_pci_configuration(struct acpi_pci_id *pci_id, u32 reg,
 785                                u64 *value, u32 width)
 786 {
 787         int result, size;
 788         u32 value32;
 789
 790         if (!value)
 791                 return AE_BAD_PARAMETER;
 792
 793         switch (width) {
 794         case 8:
 795                 size = 1;
 796                 break;
 797         case 16:
 798                 size = 2;
 799                 break;
 800         case 32:
 801                 size = 4;
 802                 break;
 803         default:
 804                 return AE_ERROR;
 805         }
 806
 807         result = raw_pci_read(pci_id->segment, pci_id->bus,
 808                                 PCI_DEVFN(pci_id->device, pci_id->function),
 809                                 reg, size, &value32);
 810         *value = value32;
 811
 812         return (result ? AE_ERROR : AE_OK);
 813 }
 814
 815 acpi_status
 816 acpi_os_write_pci_configuration(struct acpi_pci_id *pci_id, u32 reg,
 817                                 u64 value, u32 width)
 818 {
 819         int result, size;
 820
 821         switch (width) {
 822         case 8:
 823                 size = 1;
 824                 break;
 825         case 16:
 826                 size = 2;
 827                 break;
 828         case 32:
 829                 size = 4;
 830                 break;
 831         default:
 832                 return AE_ERROR;
 833         }
 834
 835         result = raw_pci_write(pci_id->segment, pci_id->bus,
 836                                 PCI_DEVFN(pci_id->device, pci_id->function),
 837                                 reg, size, value);
 838
 839         return (result ? AE_ERROR : AE_OK);
 840 }
 841 #endif
 842
 843 static void acpi_os_execute_deferred(struct work_struct *work)
 844 {
 845         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 846
 847         dpc->function(dpc->context);
 848         kfree(dpc);
 849 }
 850
 851 #ifdef CONFIG_ACPI_DEBUGGER
 852 static struct acpi_debugger acpi_debugger;
 853 static bool acpi_debugger_initialized;
 854
 855 int acpi_register_debugger(struct module *owner,
 856                            const struct acpi_debugger_ops *ops)
 857 {
 858         int ret = 0;
 859
 860         mutex_lock(&acpi_debugger.lock);
 861         if (acpi_debugger.ops) {
 862                 ret = -EBUSY;
 863                 goto err_lock;
 864         }
 865
 866         acpi_debugger.owner = owner;
 867         acpi_debugger.ops = ops;
 868
 869 err_lock:
 870         mutex_unlock(&acpi_debugger.lock);
 871         return ret;
 872 }
 873 EXPORT_SYMBOL(acpi_register_debugger);
 874
 875 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 876 {
 877         mutex_lock(&acpi_debugger.lock);
 878         if (ops == acpi_debugger.ops) {
 879                 acpi_debugger.ops = NULL;
 880                 acpi_debugger.owner = NULL;
 881         }
 882         mutex_unlock(&acpi_debugger.lock);
 883 }
 884 EXPORT_SYMBOL(acpi_unregister_debugger);
 885
 886 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 887 {
 888         int ret;
 889         int (*func)(acpi_osd_exec_callback, void *);
 890         struct module *owner;
 891
 892         if (!acpi_debugger_initialized)
 893                 return -ENODEV;
 894         mutex_lock(&acpi_debugger.lock);
 895         if (!acpi_debugger.ops) {
 896                 ret = -ENODEV;
 897                 goto err_lock;
 898         }
 899         if (!try_module_get(acpi_debugger.owner)) {
 900                 ret = -ENODEV;
 901                 goto err_lock;
 902         }
 903         func = acpi_debugger.ops->create_thread;
 904         owner = acpi_debugger.owner;
 905         mutex_unlock(&acpi_debugger.lock);
 906
 907         ret = func(function, context);
 908
 909         mutex_lock(&acpi_debugger.lock);
 910         module_put(owner);
 911 err_lock:
 912         mutex_unlock(&acpi_debugger.lock);
 913         return ret;
 914 }
 915
 916 ssize_t acpi_debugger_write_log(const char *msg)
 917 {
 918         ssize_t ret;
 919         ssize_t (*func)(const char *);
 920         struct module *owner;
 921
 922         if (!acpi_debugger_initialized)
 923                 return -ENODEV;
 924         mutex_lock(&acpi_debugger.lock);
 925         if (!acpi_debugger.ops) {
 926                 ret = -ENODEV;
 927                 goto err_lock;
 928         }
 929         if (!try_module_get(acpi_debugger.owner)) {
 930                 ret = -ENODEV;
 931                 goto err_lock;
 932         }
 933         func = acpi_debugger.ops->write_log;
 934         owner = acpi_debugger.owner;
 935         mutex_unlock(&acpi_debugger.lock);
 936
 937         ret = func(msg);
 938
 939         mutex_lock(&acpi_debugger.lock);
 940         module_put(owner);
 941 err_lock:
 942         mutex_unlock(&acpi_debugger.lock);
 943         return ret;
 944 }
 945
 946 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 947 {
 948         ssize_t ret;
 949         ssize_t (*func)(char *, size_t);
 950         struct module *owner;
 951
 952         if (!acpi_debugger_initialized)
 953                 return -ENODEV;
 954         mutex_lock(&acpi_debugger.lock);
 955         if (!acpi_debugger.ops) {
 956                 ret = -ENODEV;
 957                 goto err_lock;
 958         }
 959         if (!try_module_get(acpi_debugger.owner)) {
 960                 ret = -ENODEV;
 961                 goto err_lock;
 962         }
 963         func = acpi_debugger.ops->read_cmd;
 964         owner = acpi_debugger.owner;
 965         mutex_unlock(&acpi_debugger.lock);
 966
 967         ret = func(buffer, buffer_length);
 968
 969         mutex_lock(&acpi_debugger.lock);
 970         module_put(owner);
 971 err_lock:
 972         mutex_unlock(&acpi_debugger.lock);
 973         return ret;
 974 }
 975
 976 int acpi_debugger_wait_command_ready(void)
 977 {
 978         int ret;
 979         int (*func)(bool, char *, size_t);
 980         struct module *owner;
 981
 982         if (!acpi_debugger_initialized)
 983                 return -ENODEV;
 984         mutex_lock(&acpi_debugger.lock);
 985         if (!acpi_debugger.ops) {
 986                 ret = -ENODEV;
 987                 goto err_lock;
 988         }
 989         if (!try_module_get(acpi_debugger.owner)) {
 990                 ret = -ENODEV;
 991                 goto err_lock;
 992         }
 993         func = acpi_debugger.ops->wait_command_ready;
 994         owner = acpi_debugger.owner;
 995         mutex_unlock(&acpi_debugger.lock);
 996
 997         ret = func(acpi_gbl_method_executing,
 998                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
 999
1000         mutex_lock(&acpi_debugger.lock);
1001         module_put(owner);
1002 err_lock:
1003         mutex_unlock(&acpi_debugger.lock);
1004         return ret;
1005 }
1006
1007 int acpi_debugger_notify_command_complete(void)
1008 {
1009         int ret;
1010         int (*func)(void);
1011         struct module *owner;
1012
1013         if (!acpi_debugger_initialized)
1014                 return -ENODEV;
1015         mutex_lock(&acpi_debugger.lock);
1016         if (!acpi_debugger.ops) {
1017                 ret = -ENODEV;
1018                 goto err_lock;
1019         }
1020         if (!try_module_get(acpi_debugger.owner)) {
1021                 ret = -ENODEV;
1022                 goto err_lock;
1023         }
1024         func = acpi_debugger.ops->notify_command_complete;
1025         owner = acpi_debugger.owner;
1026         mutex_unlock(&acpi_debugger.lock);
1027
1028         ret = func();
1029
1030         mutex_lock(&acpi_debugger.lock);
1031         module_put(owner);
1032 err_lock:
1033         mutex_unlock(&acpi_debugger.lock);
1034         return ret;
1035 }
1036
1037 int __init acpi_debugger_init(void)
1038 {
1039         mutex_init(&acpi_debugger.lock);
1040         acpi_debugger_initialized = true;
1041         return 0;
1042 }
1043 #endif
1044
1045 /*******************************************************************************
1046  *
1047  * FUNCTION:    acpi_os_execute
1048  *
1049  * PARAMETERS:  Type               - Type of the callback
1050  *              Function           - Function to be executed
1051  *              Context            - Function parameters
1052  *
1053  * RETURN:      Status
1054  *
1055  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1056  *              immediately executes function on a separate thread.
1057  *
1058  ******************************************************************************/
1059
1060 acpi_status acpi_os_execute(acpi_execute_type type,
1061                             acpi_osd_exec_callback function, void *context)
1062 {
1063         struct acpi_os_dpc *dpc;
1064         int ret;
1065
1066         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1067                           "Scheduling function [%p(%p)] for deferred execution.\n",
1068                           function, context));
1069
1070         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1071                 ret = acpi_debugger_create_thread(function, context);
1072                 if (ret) {
1073                         pr_err("Kernel thread creation failed\n");
1074                         return AE_ERROR;
1075                 }
1076                 return AE_OK;
1077         }
1078
1079         /*
1080          * Allocate/initialize DPC structure.  Note that this memory will be
1081          * freed by the callee.  The kernel handles the work_struct list  in a
1082          * way that allows us to also free its memory inside the callee.
1083          * Because we may want to schedule several tasks with different
1084          * parameters we can't use the approach some kernel code uses of
1085          * having a static work_struct.
1086          */
1087
1088         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1089         if (!dpc)
1090                 return AE_NO_MEMORY;
1091
1092         dpc->function = function;
1093         dpc->context = context;
1094         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1095
1096         /*
1097          * To prevent lockdep from complaining unnecessarily, make sure that
1098          * there is a different static lockdep key for each workqueue by using
1099          * INIT_WORK() for each of them separately.
1100          */
1101         switch (type) {
1102         case OSL_NOTIFY_HANDLER:
1103                 ret = queue_work(kacpi_notify_wq, &dpc->work);
1104                 break;
1105         case OSL_GPE_HANDLER:
1106                 /*
1107                  * On some machines, a software-initiated SMI causes corruption
1108                  * unless the SMI runs on CPU 0.  An SMI can be initiated by
1109                  * any AML, but typically it's done in GPE-related methods that
1110                  * are run via workqueues, so we can avoid the known corruption
1111                  * cases by always queueing on CPU 0.
1112                  */
1113                 ret = queue_work_on(0, kacpid_wq, &dpc->work);
1114                 break;
1115         default:
1116                 pr_err("Unsupported os_execute type %d.\n", type);
1117                 goto err;
1118         }
1119         if (!ret) {
1120                 pr_err("Unable to queue work\n");
1121                 goto err;
1122         }
1123
1124         return AE_OK;
1125
1126 err:
1127         kfree(dpc);
1128         return AE_ERROR;
1129 }
1130 EXPORT_SYMBOL(acpi_os_execute);
1131
1132 void acpi_os_wait_events_complete(void)
1133 {
1134         /*
1135          * Make sure the GPE handler or the fixed event handler is not used
1136          * on another CPU after removal.
1137          */
1138         if (acpi_sci_irq_valid())
1139                 synchronize_hardirq(acpi_sci_irq);
1140         flush_workqueue(kacpid_wq);
1141         flush_workqueue(kacpi_notify_wq);
1142 }
1143 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1144
1145 struct acpi_hp_work {
1146         struct work_struct work;
1147         struct acpi_device *adev;
1148         u32 src;
1149 };
1150
1151 static void acpi_hotplug_work_fn(struct work_struct *work)
1152 {
1153         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1154
1155         acpi_os_wait_events_complete();
1156         acpi_device_hotplug(hpw->adev, hpw->src);
1157         kfree(hpw);
1158 }
1159
1160 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1161 {
1162         struct acpi_hp_work *hpw;
1163
1164         acpi_handle_debug(adev->handle,
1165                           "Scheduling hotplug event %u for deferred handling\n",
1166                            src);
1167
1168         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1169         if (!hpw)
1170                 return AE_NO_MEMORY;
1171
1172         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1173         hpw->adev = adev;
1174         hpw->src = src;
1175         /*
1176          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1177          * the hotplug code may call driver .remove() functions, which may
1178          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1179          * these workqueues.
1180          */
1181         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1182                 kfree(hpw);
1183                 return AE_ERROR;
1184         }
1185         return AE_OK;
1186 }
1187
1188 bool acpi_queue_hotplug_work(struct work_struct *work)
1189 {
1190         return queue_work(kacpi_hotplug_wq, work);
1191 }
1192
1193 acpi_status
1194 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle *handle)
1195 {
1196         struct semaphore *sem = NULL;
1197
1198         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1199         if (!sem)
1200                 return AE_NO_MEMORY;
1201
1202         sema_init(sem, initial_units);
1203
1204         *handle = (acpi_handle *) sem;
1205
1206         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1207                           *handle, initial_units));
1208
1209         return AE_OK;
1210 }
1211
1212 /*
1213  * TODO: A better way to delete semaphores?  Linux doesn't have a
1214  * 'delete_semaphore()' function -- may result in an invalid
1215  * pointer dereference for non-synchronized consumers.  Should
1216  * we at least check for blocked threads and signal/cancel them?
1217  */
1218
1219 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1220 {
1221         struct semaphore *sem = (struct semaphore *)handle;
1222
1223         if (!sem)
1224                 return AE_BAD_PARAMETER;
1225
1226         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1227
1228         BUG_ON(!list_empty(&sem->wait_list));
1229         kfree(sem);
1230         sem = NULL;
1231
1232         return AE_OK;
1233 }
1234
1235 /*
1236  * TODO: Support for units > 1?
1237  */
1238 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1239 {
1240         acpi_status status = AE_OK;
1241         struct semaphore *sem = (struct semaphore *)handle;
1242         long jiffies;
1243         int ret = 0;
1244
1245         if (!acpi_os_initialized)
1246                 return AE_OK;
1247
1248         if (!sem || (units < 1))
1249                 return AE_BAD_PARAMETER;
1250
1251         if (units > 1)
1252                 return AE_SUPPORT;
1253
1254         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1255                           handle, units, timeout));
1256
1257         if (timeout == ACPI_WAIT_FOREVER)
1258                 jiffies = MAX_SCHEDULE_TIMEOUT;
1259         else
1260                 jiffies = msecs_to_jiffies(timeout);
1261
1262         ret = down_timeout(sem, jiffies);
1263         if (ret)
1264                 status = AE_TIME;
1265
1266         if (ACPI_FAILURE(status)) {
1267                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1268                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1269                                   handle, units, timeout,
1270                                   acpi_format_exception(status)));
1271         } else {
1272                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1273                                   "Acquired semaphore[%p|%d|%d]", handle,
1274                                   units, timeout));
1275         }
1276
1277         return status;
1278 }
1279
1280 /*
1281  * TODO: Support for units > 1?
1282  */
1283 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1284 {
1285         struct semaphore *sem = (struct semaphore *)handle;
1286
1287         if (!acpi_os_initialized)
1288                 return AE_OK;
1289
1290         if (!sem || (units < 1))
1291                 return AE_BAD_PARAMETER;
1292
1293         if (units > 1)
1294                 return AE_SUPPORT;
1295
1296         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1297                           units));
1298
1299         up(sem);
1300
1301         return AE_OK;
1302 }
1303
1304 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1305 {
1306 #ifdef ENABLE_DEBUGGER
1307         if (acpi_in_debugger) {
1308                 u32 chars;
1309
1310                 kdb_read(buffer, buffer_length);
1311
1312                 /* remove the CR kdb includes */
1313                 chars = strlen(buffer) - 1;
1314                 buffer[chars] = '\0';
1315         }
1316 #else
1317         int ret;
1318
1319         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1320         if (ret < 0)
1321                 return AE_ERROR;
1322         if (bytes_read)
1323                 *bytes_read = ret;
1324 #endif
1325
1326         return AE_OK;
1327 }
1328 EXPORT_SYMBOL(acpi_os_get_line);
1329
1330 acpi_status acpi_os_wait_command_ready(void)
1331 {
1332         int ret;
1333
1334         ret = acpi_debugger_wait_command_ready();
1335         if (ret < 0)
1336                 return AE_ERROR;
1337         return AE_OK;
1338 }
1339
1340 acpi_status acpi_os_notify_command_complete(void)
1341 {
1342         int ret;
1343
1344         ret = acpi_debugger_notify_command_complete();
1345         if (ret < 0)
1346                 return AE_ERROR;
1347         return AE_OK;
1348 }
1349
1350 acpi_status acpi_os_signal(u32 function, void *info)
1351 {
1352         switch (function) {
1353         case ACPI_SIGNAL_FATAL:
1354                 pr_err("Fatal opcode executed\n");
1355                 break;
1356         case ACPI_SIGNAL_BREAKPOINT:
1357                 /*
1358                  * AML Breakpoint
1359                  * ACPI spec. says to treat it as a NOP unless
1360                  * you are debugging.  So if/when we integrate
1361                  * AML debugger into the kernel debugger its
1362                  * hook will go here.  But until then it is
1363                  * not useful to print anything on breakpoints.
1364                  */
1365                 break;
1366         default:
1367                 break;
1368         }
1369
1370         return AE_OK;
1371 }
1372
1373 static int __init acpi_os_name_setup(char *str)
1374 {
1375         char *p = acpi_os_name;
1376         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1377
1378         if (!str || !*str)
1379                 return 0;
1380
1381         for (; count-- && *str; str++) {
1382                 if (isalnum(*str) || *str == ' ' || *str == ':')
1383                         *p++ = *str;
1384                 else if (*str == '\'' || *str == '"')
1385                         continue;
1386                 else
1387                         break;
1388         }
1389         *p = 0;
1390
1391         return 1;
1392
1393 }
1394
1395 __setup("acpi_os_name=", acpi_os_name_setup);
1396
1397 /*
1398  * Disable the auto-serialization of named objects creation methods.
1399  *
1400  * This feature is enabled by default.  It marks the AML control methods
1401  * that contain the opcodes to create named objects as "Serialized".
1402  */
1403 static int __init acpi_no_auto_serialize_setup(char *str)
1404 {
1405         acpi_gbl_auto_serialize_methods = FALSE;
1406         pr_info("Auto-serialization disabled\n");
1407
1408         return 1;
1409 }
1410
1411 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1412
1413 /* Check of resource interference between native drivers and ACPI
1414  * OperationRegions (SystemIO and System Memory only).
1415  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1416  * in arbitrary AML code and can interfere with legacy drivers.
1417  * acpi_enforce_resources= can be set to:
1418  *
1419  *   - strict (default) (2)
1420  *     -> further driver trying to access the resources will not load
1421  *   - lax              (1)
1422  *     -> further driver trying to access the resources will load, but you
1423  *     get a system message that something might go wrong...
1424  *
1425  *   - no               (0)
1426  *     -> ACPI Operation Region resources will not be registered
1427  *
1428  */
1429 #define ENFORCE_RESOURCES_STRICT 2
1430 #define ENFORCE_RESOURCES_LAX    1
1431 #define ENFORCE_RESOURCES_NO     0
1432
1433 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1434
1435 static int __init acpi_enforce_resources_setup(char *str)
1436 {
1437         if (str == NULL || *str == '\0')
1438                 return 0;
1439
1440         if (!strcmp("strict", str))
1441                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1442         else if (!strcmp("lax", str))
1443                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1444         else if (!strcmp("no", str))
1445                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1446
1447         return 1;
1448 }
1449
1450 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1451
1452 /* Check for resource conflicts between ACPI OperationRegions and native
1453  * drivers */
1454 int acpi_check_resource_conflict(const struct resource *res)
1455 {
1456         acpi_adr_space_type space_id;
1457
1458         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1459                 return 0;
1460
1461         if (res->flags & IORESOURCE_IO)
1462                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1463         else if (res->flags & IORESOURCE_MEM)
1464                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1465         else
1466                 return 0;
1467
1468         if (!acpi_check_address_range(space_id, res->start, resource_size(res), 1))
1469                 return 0;
1470
1471         pr_info("Resource conflict; ACPI support missing from driver?\n");
1472
1473         if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1474                 return -EBUSY;
1475
1476         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1477                 pr_notice("Resource conflict: System may be unstable or behave erratically\n");
1478
1479         return 0;
1480 }
1481 EXPORT_SYMBOL(acpi_check_resource_conflict);
1482
1483 int acpi_check_region(resource_size_t start, resource_size_t n,
1484                       const char *name)
1485 {
1486         struct resource res = DEFINE_RES_IO_NAMED(start, n, name);
1487
1488         return acpi_check_resource_conflict(&res);
1489 }
1490 EXPORT_SYMBOL(acpi_check_region);
1491
1492 /*
1493  * Let drivers know whether the resource checks are effective
1494  */
1495 int acpi_resources_are_enforced(void)
1496 {
1497         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1498 }
1499 EXPORT_SYMBOL(acpi_resources_are_enforced);
1500
1501 /*
1502  * Deallocate the memory for a spinlock.
1503  */
1504 void acpi_os_delete_lock(acpi_spinlock handle)
1505 {
1506         ACPI_FREE(handle);
1507 }
1508
1509 /*
1510  * Acquire a spinlock.
1511  *
1512  * handle is a pointer to the spinlock_t.
1513  */
1514
1515 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1516         __acquires(lockp)
1517 {
1518         spin_lock(lockp);
1519         return 0;
1520 }
1521
1522 /*
1523  * Release a spinlock. See above.
1524  */
1525
1526 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags not_used)
1527         __releases(lockp)
1528 {
1529         spin_unlock(lockp);
1530 }
1531
1532 #ifndef ACPI_USE_LOCAL_CACHE
1533
1534 /*******************************************************************************
1535  *
1536  * FUNCTION:    acpi_os_create_cache
1537  *
1538  * PARAMETERS:  name      - Ascii name for the cache
1539  *              size      - Size of each cached object
1540  *              depth     - Maximum depth of the cache (in objects) <ignored>
1541  *              cache     - Where the new cache object is returned
1542  *
1543  * RETURN:      status
1544  *
1545  * DESCRIPTION: Create a cache object
1546  *
1547  ******************************************************************************/
1548
1549 acpi_status
1550 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t **cache)
1551 {
1552         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1553         if (*cache == NULL)
1554                 return AE_ERROR;
1555         else
1556                 return AE_OK;
1557 }
1558
1559 /*******************************************************************************
1560  *
1561  * FUNCTION:    acpi_os_purge_cache
1562  *
1563  * PARAMETERS:  Cache           - Handle to cache object
1564  *
1565  * RETURN:      Status
1566  *
1567  * DESCRIPTION: Free all objects within the requested cache.
1568  *
1569  ******************************************************************************/
1570
1571 acpi_status acpi_os_purge_cache(acpi_cache_t *cache)
1572 {
1573         kmem_cache_shrink(cache);
1574         return AE_OK;
1575 }
1576
1577 /*******************************************************************************
1578  *
1579  * FUNCTION:    acpi_os_delete_cache
1580  *
1581  * PARAMETERS:  Cache           - Handle to cache object
1582  *
1583  * RETURN:      Status
1584  *
1585  * DESCRIPTION: Free all objects within the requested cache and delete the
1586  *              cache object.
1587  *
1588  ******************************************************************************/
1589
1590 acpi_status acpi_os_delete_cache(acpi_cache_t *cache)
1591 {
1592         kmem_cache_destroy(cache);
1593         return AE_OK;
1594 }
1595
1596 /*******************************************************************************
1597  *
1598  * FUNCTION:    acpi_os_release_object
1599  *
1600  * PARAMETERS:  Cache       - Handle to cache object
1601  *              Object      - The object to be released
1602  *
1603  * RETURN:      None
1604  *
1605  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1606  *              the object is deleted.
1607  *
1608  ******************************************************************************/
1609
1610 acpi_status acpi_os_release_object(acpi_cache_t *cache, void *object)
1611 {
1612         kmem_cache_free(cache, object);
1613         return AE_OK;
1614 }
1615 #endif
1616
1617 static int __init acpi_no_static_ssdt_setup(char *s)
1618 {
1619         acpi_gbl_disable_ssdt_table_install = TRUE;
1620         pr_info("Static SSDT installation disabled\n");
1621
1622         return 0;
1623 }
1624
1625 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1626
1627 static int __init acpi_disable_return_repair(char *s)
1628 {
1629         pr_notice("Predefined validation mechanism disabled\n");
1630         acpi_gbl_disable_auto_repair = TRUE;
1631
1632         return 1;
1633 }
1634
1635 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1636
1637 acpi_status __init acpi_os_initialize(void)
1638 {
1639         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1640         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1641
1642         acpi_gbl_xgpe0_block_logical_address =
1643                 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1644         acpi_gbl_xgpe1_block_logical_address =
1645                 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1646
1647         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1648                 /*
1649                  * Use acpi_os_map_generic_address to pre-map the reset
1650                  * register if it's in system memory.
1651                  */
1652                 void *rv;
1653
1654                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1655                 pr_debug("%s: Reset register mapping %s\n", __func__,
1656                          rv ? "successful" : "failed");
1657         }
1658         acpi_os_initialized = true;
1659
1660         return AE_OK;
1661 }
1662
1663 acpi_status __init acpi_os_initialize1(void)
1664 {
1665         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1666         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 0);
1667         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1668         BUG_ON(!kacpid_wq);
1669         BUG_ON(!kacpi_notify_wq);
1670         BUG_ON(!kacpi_hotplug_wq);
1671         acpi_osi_init();
1672         return AE_OK;
1673 }
1674
1675 acpi_status acpi_os_terminate(void)
1676 {
1677         if (acpi_irq_handler) {
1678                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1679                                                  acpi_irq_handler);
1680         }
1681
1682         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1683         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1684         acpi_gbl_xgpe0_block_logical_address = 0UL;
1685         acpi_gbl_xgpe1_block_logical_address = 0UL;
1686
1687         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1688         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1689
1690         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1691                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1692
1693         destroy_workqueue(kacpid_wq);
1694         destroy_workqueue(kacpi_notify_wq);
1695         destroy_workqueue(kacpi_hotplug_wq);
1696
1697         return AE_OK;
1698 }
1699
1700 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1701                                   u32 pm1b_control)
1702 {
1703         int rc = 0;
1704
1705         if (__acpi_os_prepare_sleep)
1706                 rc = __acpi_os_prepare_sleep(sleep_state,
1707                                              pm1a_control, pm1b_control);
1708         if (rc < 0)
1709                 return AE_ERROR;
1710         else if (rc > 0)
1711                 return AE_CTRL_TERMINATE;
1712
1713         return AE_OK;
1714 }
1715
1716 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1717                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1718 {
1719         __acpi_os_prepare_sleep = func;
1720 }
1721
1722 #if (ACPI_REDUCED_HARDWARE)
1723 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1724                                   u32 val_b)
1725 {
1726         int rc = 0;
1727
1728         if (__acpi_os_prepare_extended_sleep)
1729                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1730                                              val_a, val_b);
1731         if (rc < 0)
1732                 return AE_ERROR;
1733         else if (rc > 0)
1734                 return AE_CTRL_TERMINATE;
1735
1736         return AE_OK;
1737 }
1738 #else
1739 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1740                                   u32 val_b)
1741 {
1742         return AE_OK;
1743 }
1744 #endif
1745
1746 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1747                                u32 val_a, u32 val_b))
1748 {
1749         __acpi_os_prepare_extended_sleep = func;
1750 }
1751
1752 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1753                                 u32 reg_a_value, u32 reg_b_value)
1754 {
1755         acpi_status status;
1756
1757         if (acpi_gbl_reduced_hardware)
1758                 status = acpi_os_prepare_extended_sleep(sleep_state,
1759                                                         reg_a_value,
1760                                                         reg_b_value);
1761         else
1762                 status = acpi_os_prepare_sleep(sleep_state,
1763                                                reg_a_value, reg_b_value);
1764         return status;
1765 }