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 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/mm.h>
  16 #include <linux/highmem.h>
  17 #include <linux/lockdep.h>
  18 #include <linux/pci.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/kmod.h>
  21 #include <linux/delay.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/nmi.h>
  24 #include <linux/acpi.h>
  25 #include <linux/efi.h>
  26 #include <linux/ioport.h>
  27 #include <linux/list.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/semaphore.h>
  30 #include <linux/security.h>
  31
  32 #include <asm/io.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/io-64-nonatomic-lo-hi.h>
  35
  36 #include "acpica/accommon.h"
  37 #include "acpica/acnamesp.h"
  38 #include "internal.h"
  39
  40 #define _COMPONENT              ACPI_OS_SERVICES
  41 ACPI_MODULE_NAME("osl");
  42
  43 struct acpi_os_dpc {
  44         acpi_osd_exec_callback function;
  45         void *context;
  46         struct work_struct work;
  47 };
  48
  49 #ifdef ENABLE_DEBUGGER
  50 #include <linux/kdb.h>
  51
  52 /* stuff for debugger support */
  53 int acpi_in_debugger;
  54 EXPORT_SYMBOL(acpi_in_debugger);
  55 #endif                          /*ENABLE_DEBUGGER */
  56
  57 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  58                                       u32 pm1b_ctrl);
  59 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  60                                       u32 val_b);
  61
  62 static acpi_osd_handler acpi_irq_handler;
  63 static void *acpi_irq_context;
  64 static struct workqueue_struct *kacpid_wq;
  65 static struct workqueue_struct *kacpi_notify_wq;
  66 static struct workqueue_struct *kacpi_hotplug_wq;
  67 static bool acpi_os_initialized;
  68 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  69 bool acpi_permanent_mmap = false;
  70
  71 /*
  72  * This list of permanent mappings is for memory that may be accessed from
  73  * interrupt context, where we can't do the ioremap().
  74  */
  75 struct acpi_ioremap {
  76         struct list_head list;
  77         void __iomem *virt;
  78         acpi_physical_address phys;
  79         acpi_size size;
  80         union {
  81                 unsigned long refcount;
  82                 struct rcu_work rwork;
  83         } track;
  84 };
  85
  86 static LIST_HEAD(acpi_ioremaps);
  87 static DEFINE_MUTEX(acpi_ioremap_lock);
  88 #define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
  89
  90 static void __init acpi_request_region (struct acpi_generic_address *gas,
  91         unsigned int length, char *desc)
  92 {
  93         u64 addr;
  94
  95         /* Handle possible alignment issues */
  96         memcpy(&addr, &gas->address, sizeof(addr));
  97         if (!addr || !length)
  98                 return;
  99
 100         /* Resources are never freed */
 101         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 102                 request_region(addr, length, desc);
 103         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 104                 request_mem_region(addr, length, desc);
 105 }
 106
 107 static int __init acpi_reserve_resources(void)
 108 {
 109         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 110                 "ACPI PM1a_EVT_BLK");
 111
 112         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 113                 "ACPI PM1b_EVT_BLK");
 114
 115         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 116                 "ACPI PM1a_CNT_BLK");
 117
 118         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 119                 "ACPI PM1b_CNT_BLK");
 120
 121         if (acpi_gbl_FADT.pm_timer_length == 4)
 122                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 123
 124         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 125                 "ACPI PM2_CNT_BLK");
 126
 127         /* Length of GPE blocks must be a non-negative multiple of 2 */
 128
 129         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 130                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 131                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 132
 133         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 134                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 135                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 136
 137         return 0;
 138 }
 139 fs_initcall_sync(acpi_reserve_resources);
 140
 141 void acpi_os_printf(const char *fmt, ...)
 142 {
 143         va_list args;
 144         va_start(args, fmt);
 145         acpi_os_vprintf(fmt, args);
 146         va_end(args);
 147 }
 148 EXPORT_SYMBOL(acpi_os_printf);
 149
 150 void acpi_os_vprintf(const char *fmt, va_list args)
 151 {
 152         static char buffer[512];
 153
 154         vsprintf(buffer, fmt, args);
 155
 156 #ifdef ENABLE_DEBUGGER
 157         if (acpi_in_debugger) {
 158                 kdb_printf("%s", buffer);
 159         } else {
 160                 if (printk_get_level(buffer))
 161                         printk("%s", buffer);
 162                 else
 163                         printk(KERN_CONT "%s", buffer);
 164         }
 165 #else
 166         if (acpi_debugger_write_log(buffer) < 0) {
 167                 if (printk_get_level(buffer))
 168                         printk("%s", buffer);
 169                 else
 170                         printk(KERN_CONT "%s", buffer);
 171         }
 172 #endif
 173 }
 174
 175 #ifdef CONFIG_KEXEC
 176 static unsigned long acpi_rsdp;
 177 static int __init setup_acpi_rsdp(char *arg)
 178 {
 179         return kstrtoul(arg, 16, &acpi_rsdp);
 180 }
 181 early_param("acpi_rsdp", setup_acpi_rsdp);
 182 #endif
 183
 184 acpi_physical_address __init acpi_os_get_root_pointer(void)
 185 {
 186         acpi_physical_address pa;
 187
 188 #ifdef CONFIG_KEXEC
 189         /*
 190          * We may have been provided with an RSDP on the command line,
 191          * but if a malicious user has done so they may be pointing us
 192          * at modified ACPI tables that could alter kernel behaviour -
 193          * so, we check the lockdown status before making use of
 194          * it. If we trust it then also stash it in an architecture
 195          * specific location (if appropriate) so it can be carried
 196          * over further kexec()s.
 197          */
 198         if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
 199                 acpi_arch_set_root_pointer(acpi_rsdp);
 200                 return acpi_rsdp;
 201         }
 202 #endif
 203         pa = acpi_arch_get_root_pointer();
 204         if (pa)
 205                 return pa;
 206
 207         if (efi_enabled(EFI_CONFIG_TABLES)) {
 208                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 209                         return efi.acpi20;
 210                 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 211                         return efi.acpi;
 212                 pr_err(PREFIX "System description tables not found\n");
 213         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 214                 acpi_find_root_pointer(&pa);
 215         }
 216
 217         return pa;
 218 }
 219
 220 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 221 static struct acpi_ioremap *
 222 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 223 {
 224         struct acpi_ioremap *map;
 225
 226         list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
 227                 if (map->phys <= phys &&
 228                     phys + size <= map->phys + map->size)
 229                         return map;
 230
 231         return NULL;
 232 }
 233
 234 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 235 static void __iomem *
 236 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 237 {
 238         struct acpi_ioremap *map;
 239
 240         map = acpi_map_lookup(phys, size);
 241         if (map)
 242                 return map->virt + (phys - map->phys);
 243
 244         return NULL;
 245 }
 246
 247 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 248 {
 249         struct acpi_ioremap *map;
 250         void __iomem *virt = NULL;
 251
 252         mutex_lock(&acpi_ioremap_lock);
 253         map = acpi_map_lookup(phys, size);
 254         if (map) {
 255                 virt = map->virt + (phys - map->phys);
 256                 map->track.refcount++;
 257         }
 258         mutex_unlock(&acpi_ioremap_lock);
 259         return virt;
 260 }
 261 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 262
 263 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 264 static struct acpi_ioremap *
 265 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 266 {
 267         struct acpi_ioremap *map;
 268
 269         list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
 270                 if (map->virt <= virt &&
 271                     virt + size <= map->virt + map->size)
 272                         return map;
 273
 274         return NULL;
 275 }
 276
 277 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 278 /* ioremap will take care of cache attributes */
 279 #define should_use_kmap(pfn)   0
 280 #else
 281 #define should_use_kmap(pfn)   page_is_ram(pfn)
 282 #endif
 283
 284 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 285 {
 286         unsigned long pfn;
 287
 288         pfn = pg_off >> PAGE_SHIFT;
 289         if (should_use_kmap(pfn)) {
 290                 if (pg_sz > PAGE_SIZE)
 291                         return NULL;
 292                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 293         } else
 294                 return acpi_os_ioremap(pg_off, pg_sz);
 295 }
 296
 297 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 298 {
 299         unsigned long pfn;
 300
 301         pfn = pg_off >> PAGE_SHIFT;
 302         if (should_use_kmap(pfn))
 303                 kunmap(pfn_to_page(pfn));
 304         else
 305                 iounmap(vaddr);
 306 }
 307
 308 /**
 309  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 310  * @phys: Start of the physical address range to map.
 311  * @size: Size of the physical address range to map.
 312  *
 313  * Look up the given physical address range in the list of existing ACPI memory
 314  * mappings.  If found, get a reference to it and return a pointer to it (its
 315  * virtual address).  If not found, map it, add it to that list and return a
 316  * pointer to it.
 317  *
 318  * During early init (when acpi_permanent_mmap has not been set yet) this
 319  * routine simply calls __acpi_map_table() to get the job done.
 320  */
 321 void __iomem __ref
 322 *acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 323 {
 324         struct acpi_ioremap *map;
 325         void __iomem *virt;
 326         acpi_physical_address pg_off;
 327         acpi_size pg_sz;
 328
 329         if (phys > ULONG_MAX) {
 330                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 331                 return NULL;
 332         }
 333
 334         if (!acpi_permanent_mmap)
 335                 return __acpi_map_table((unsigned long)phys, size);
 336
 337         mutex_lock(&acpi_ioremap_lock);
 338         /* Check if there's a suitable mapping already. */
 339         map = acpi_map_lookup(phys, size);
 340         if (map) {
 341                 map->track.refcount++;
 342                 goto out;
 343         }
 344
 345         map = kzalloc(sizeof(*map), GFP_KERNEL);
 346         if (!map) {
 347                 mutex_unlock(&acpi_ioremap_lock);
 348                 return NULL;
 349         }
 350
 351         pg_off = round_down(phys, PAGE_SIZE);
 352         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 353         virt = acpi_map(phys, size);
 354         if (!virt) {
 355                 mutex_unlock(&acpi_ioremap_lock);
 356                 kfree(map);
 357                 return NULL;
 358         }
 359
 360         INIT_LIST_HEAD(&map->list);
 361         map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
 362         map->phys = pg_off;
 363         map->size = pg_sz;
 364         map->track.refcount = 1;
 365
 366         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 367
 368 out:
 369         mutex_unlock(&acpi_ioremap_lock);
 370         return map->virt + (phys - map->phys);
 371 }
 372 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 373
 374 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 375 {
 376         return (void *)acpi_os_map_iomem(phys, size);
 377 }
 378 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 379
 380 static void acpi_os_map_remove(struct work_struct *work)
 381 {
 382         struct acpi_ioremap *map = container_of(to_rcu_work(work),
 383                                                 struct acpi_ioremap,
 384                                                 track.rwork);
 385
 386         acpi_unmap(map->phys, map->virt);
 387         kfree(map);
 388 }
 389
 390 /* Must be called with mutex_lock(&acpi_ioremap_lock) */
 391 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 392 {
 393         if (--map->track.refcount)
 394                 return;
 395
 396         list_del_rcu(&map->list);
 397
 398         INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
 399         queue_rcu_work(system_wq, &map->track.rwork);
 400 }
 401
 402 /**
 403  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 404  * @virt: Start of the address range to drop a reference to.
 405  * @size: Size of the address range to drop a reference to.
 406  *
 407  * Look up the given virtual address range in the list of existing ACPI memory
 408  * mappings, drop a reference to it and if there are no more active references
 409  * to it, queue it up for later removal.
 410  *
 411  * During early init (when acpi_permanent_mmap has not been set yet) this
 412  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 413  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 414  * here.
 415  */
 416 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 417 {
 418         struct acpi_ioremap *map;
 419
 420         if (!acpi_permanent_mmap) {
 421                 __acpi_unmap_table(virt, size);
 422                 return;
 423         }
 424
 425         mutex_lock(&acpi_ioremap_lock);
 426
 427         map = acpi_map_lookup_virt(virt, size);
 428         if (!map) {
 429                 mutex_unlock(&acpi_ioremap_lock);
 430                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 431                 return;
 432         }
 433         acpi_os_drop_map_ref(map);
 434
 435         mutex_unlock(&acpi_ioremap_lock);
 436 }
 437 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 438
 439 /**
 440  * acpi_os_unmap_memory - Drop a memory mapping reference.
 441  * @virt: Start of the address range to drop a reference to.
 442  * @size: Size of the address range to drop a reference to.
 443  */
 444 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 445 {
 446         acpi_os_unmap_iomem((void __iomem *)virt, size);
 447 }
 448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 449
 450 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 451 {
 452         u64 addr;
 453         void __iomem *virt;
 454
 455         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 456                 return 0;
 457
 458         /* Handle possible alignment issues */
 459         memcpy(&addr, &gas->address, sizeof(addr));
 460         if (!addr || !gas->bit_width)
 461                 return -EINVAL;
 462
 463         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 464         if (!virt)
 465                 return -EIO;
 466
 467         return 0;
 468 }
 469 EXPORT_SYMBOL(acpi_os_map_generic_address);
 470
 471 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 472 {
 473         u64 addr;
 474         struct acpi_ioremap *map;
 475
 476         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 477                 return;
 478
 479         /* Handle possible alignment issues */
 480         memcpy(&addr, &gas->address, sizeof(addr));
 481         if (!addr || !gas->bit_width)
 482                 return;
 483
 484         mutex_lock(&acpi_ioremap_lock);
 485
 486         map = acpi_map_lookup(addr, gas->bit_width / 8);
 487         if (!map) {
 488                 mutex_unlock(&acpi_ioremap_lock);
 489                 return;
 490         }
 491         acpi_os_drop_map_ref(map);
 492
 493         mutex_unlock(&acpi_ioremap_lock);
 494 }
 495 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 496
 497 #ifdef ACPI_FUTURE_USAGE
 498 acpi_status
 499 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 500 {
 501         if (!phys || !virt)
 502                 return AE_BAD_PARAMETER;
 503
 504         *phys = virt_to_phys(virt);
 505
 506         return AE_OK;
 507 }
 508 #endif
 509
 510 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 511 static bool acpi_rev_override;
 512
 513 int __init acpi_rev_override_setup(char *str)
 514 {
 515         acpi_rev_override = true;
 516         return 1;
 517 }
 518 __setup("acpi_rev_override", acpi_rev_override_setup);
 519 #else
 520 #define acpi_rev_override       false
 521 #endif
 522
 523 #define ACPI_MAX_OVERRIDE_LEN 100
 524
 525 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 526
 527 acpi_status
 528 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 529                             acpi_string *new_val)
 530 {
 531         if (!init_val || !new_val)
 532                 return AE_BAD_PARAMETER;
 533
 534         *new_val = NULL;
 535         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 536                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 537                        acpi_os_name);
 538                 *new_val = acpi_os_name;
 539         }
 540
 541         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 542                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 543                 *new_val = (char *)5;
 544         }
 545
 546         return AE_OK;
 547 }
 548
 549 static irqreturn_t acpi_irq(int irq, void *dev_id)
 550 {
 551         u32 handled;
 552
 553         handled = (*acpi_irq_handler) (acpi_irq_context);
 554
 555         if (handled) {
 556                 acpi_irq_handled++;
 557                 return IRQ_HANDLED;
 558         } else {
 559                 acpi_irq_not_handled++;
 560                 return IRQ_NONE;
 561         }
 562 }
 563
 564 acpi_status
 565 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 566                                   void *context)
 567 {
 568         unsigned int irq;
 569
 570         acpi_irq_stats_init();
 571
 572         /*
 573          * ACPI interrupts different from the SCI in our copy of the FADT are
 574          * not supported.
 575          */
 576         if (gsi != acpi_gbl_FADT.sci_interrupt)
 577                 return AE_BAD_PARAMETER;
 578
 579         if (acpi_irq_handler)
 580                 return AE_ALREADY_ACQUIRED;
 581
 582         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 583                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 584                        gsi);
 585                 return AE_OK;
 586         }
 587
 588         acpi_irq_handler = handler;
 589         acpi_irq_context = context;
 590         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 591                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 592                 acpi_irq_handler = NULL;
 593                 return AE_NOT_ACQUIRED;
 594         }
 595         acpi_sci_irq = irq;
 596
 597         return AE_OK;
 598 }
 599
 600 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 601 {
 602         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 603                 return AE_BAD_PARAMETER;
 604
 605         free_irq(acpi_sci_irq, acpi_irq);
 606         acpi_irq_handler = NULL;
 607         acpi_sci_irq = INVALID_ACPI_IRQ;
 608
 609         return AE_OK;
 610 }
 611
 612 /*
 613  * Running in interpreter thread context, safe to sleep
 614  */
 615
 616 void acpi_os_sleep(u64 ms)
 617 {
 618         msleep(ms);
 619 }
 620
 621 void acpi_os_stall(u32 us)
 622 {
 623         while (us) {
 624                 u32 delay = 1000;
 625
 626                 if (delay > us)
 627                         delay = us;
 628                 udelay(delay);
 629                 touch_nmi_watchdog();
 630                 us -= delay;
 631         }
 632 }
 633
 634 /*
 635  * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
 636  * monotonically increasing timer with 100ns granularity. Do not use
 637  * ktime_get() to implement this function because this function may get
 638  * called after timekeeping has been suspended. Note: calling this function
 639  * after timekeeping has been suspended may lead to unexpected results
 640  * because when timekeeping is suspended the jiffies counter is not
 641  * incremented. See also timekeeping_suspend().
 642  */
 643 u64 acpi_os_get_timer(void)
 644 {
 645         return (get_jiffies_64() - INITIAL_JIFFIES) *
 646                 (ACPI_100NSEC_PER_SEC / HZ);
 647 }
 648
 649 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 650 {
 651         u32 dummy;
 652
 653         if (!value)
 654                 value = &dummy;
 655
 656         *value = 0;
 657         if (width <= 8) {
 658                 *(u8 *) value = inb(port);
 659         } else if (width <= 16) {
 660                 *(u16 *) value = inw(port);
 661         } else if (width <= 32) {
 662                 *(u32 *) value = inl(port);
 663         } else {
 664                 BUG();
 665         }
 666
 667         return AE_OK;
 668 }
 669
 670 EXPORT_SYMBOL(acpi_os_read_port);
 671
 672 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 673 {
 674         if (width <= 8) {
 675                 outb(value, port);
 676         } else if (width <= 16) {
 677                 outw(value, port);
 678         } else if (width <= 32) {
 679                 outl(value, port);
 680         } else {
 681                 BUG();
 682         }
 683
 684         return AE_OK;
 685 }
 686
 687 EXPORT_SYMBOL(acpi_os_write_port);
 688
 689 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 690 {
 691
 692         switch (width) {
 693         case 8:
 694                 *(u8 *) value = readb(virt_addr);
 695                 break;
 696         case 16:
 697                 *(u16 *) value = readw(virt_addr);
 698                 break;
 699         case 32:
 700                 *(u32 *) value = readl(virt_addr);
 701                 break;
 702         case 64:
 703                 *(u64 *) value = readq(virt_addr);
 704                 break;
 705         default:
 706                 return -EINVAL;
 707         }
 708
 709         return 0;
 710 }
 711
 712 acpi_status
 713 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 714 {
 715         void __iomem *virt_addr;
 716         unsigned int size = width / 8;
 717         bool unmap = false;
 718         u64 dummy;
 719         int error;
 720
 721         rcu_read_lock();
 722         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 723         if (!virt_addr) {
 724                 rcu_read_unlock();
 725                 virt_addr = acpi_os_ioremap(phys_addr, size);
 726                 if (!virt_addr)
 727                         return AE_BAD_ADDRESS;
 728                 unmap = true;
 729         }
 730
 731         if (!value)
 732                 value = &dummy;
 733
 734         error = acpi_os_read_iomem(virt_addr, value, width);
 735         BUG_ON(error);
 736
 737         if (unmap)
 738                 iounmap(virt_addr);
 739         else
 740                 rcu_read_unlock();
 741
 742         return AE_OK;
 743 }
 744
 745 acpi_status
 746 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 747 {
 748         void __iomem *virt_addr;
 749         unsigned int size = width / 8;
 750         bool unmap = false;
 751
 752         rcu_read_lock();
 753         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 754         if (!virt_addr) {
 755                 rcu_read_unlock();
 756                 virt_addr = acpi_os_ioremap(phys_addr, size);
 757                 if (!virt_addr)
 758                         return AE_BAD_ADDRESS;
 759                 unmap = true;
 760         }
 761
 762         switch (width) {
 763         case 8:
 764                 writeb(value, virt_addr);
 765                 break;
 766         case 16:
 767                 writew(value, virt_addr);
 768                 break;
 769         case 32:
 770                 writel(value, virt_addr);
 771                 break;
 772         case 64:
 773                 writeq(value, virt_addr);
 774                 break;
 775         default:
 776                 BUG();
 777         }
 778
 779         if (unmap)
 780                 iounmap(virt_addr);
 781         else
 782                 rcu_read_unlock();
 783
 784         return AE_OK;
 785 }
 786
 787 #ifdef CONFIG_PCI
 788 acpi_status
 789 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 790                                u64 *value, u32 width)
 791 {
 792         int result, size;
 793         u32 value32;
 794
 795         if (!value)
 796                 return AE_BAD_PARAMETER;
 797
 798         switch (width) {
 799         case 8:
 800                 size = 1;
 801                 break;
 802         case 16:
 803                 size = 2;
 804                 break;
 805         case 32:
 806                 size = 4;
 807                 break;
 808         default:
 809                 return AE_ERROR;
 810         }
 811
 812         result = raw_pci_read(pci_id->segment, pci_id->bus,
 813                                 PCI_DEVFN(pci_id->device, pci_id->function),
 814                                 reg, size, &value32);
 815         *value = value32;
 816
 817         return (result ? AE_ERROR : AE_OK);
 818 }
 819
 820 acpi_status
 821 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 822                                 u64 value, u32 width)
 823 {
 824         int result, size;
 825
 826         switch (width) {
 827         case 8:
 828                 size = 1;
 829                 break;
 830         case 16:
 831                 size = 2;
 832                 break;
 833         case 32:
 834                 size = 4;
 835                 break;
 836         default:
 837                 return AE_ERROR;
 838         }
 839
 840         result = raw_pci_write(pci_id->segment, pci_id->bus,
 841                                 PCI_DEVFN(pci_id->device, pci_id->function),
 842                                 reg, size, value);
 843
 844         return (result ? AE_ERROR : AE_OK);
 845 }
 846 #endif
 847
 848 static void acpi_os_execute_deferred(struct work_struct *work)
 849 {
 850         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 851
 852         dpc->function(dpc->context);
 853         kfree(dpc);
 854 }
 855
 856 #ifdef CONFIG_ACPI_DEBUGGER
 857 static struct acpi_debugger acpi_debugger;
 858 static bool acpi_debugger_initialized;
 859
 860 int acpi_register_debugger(struct module *owner,
 861                            const struct acpi_debugger_ops *ops)
 862 {
 863         int ret = 0;
 864
 865         mutex_lock(&acpi_debugger.lock);
 866         if (acpi_debugger.ops) {
 867                 ret = -EBUSY;
 868                 goto err_lock;
 869         }
 870
 871         acpi_debugger.owner = owner;
 872         acpi_debugger.ops = ops;
 873
 874 err_lock:
 875         mutex_unlock(&acpi_debugger.lock);
 876         return ret;
 877 }
 878 EXPORT_SYMBOL(acpi_register_debugger);
 879
 880 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 881 {
 882         mutex_lock(&acpi_debugger.lock);
 883         if (ops == acpi_debugger.ops) {
 884                 acpi_debugger.ops = NULL;
 885                 acpi_debugger.owner = NULL;
 886         }
 887         mutex_unlock(&acpi_debugger.lock);
 888 }
 889 EXPORT_SYMBOL(acpi_unregister_debugger);
 890
 891 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 892 {
 893         int ret;
 894         int (*func)(acpi_osd_exec_callback, void *);
 895         struct module *owner;
 896
 897         if (!acpi_debugger_initialized)
 898                 return -ENODEV;
 899         mutex_lock(&acpi_debugger.lock);
 900         if (!acpi_debugger.ops) {
 901                 ret = -ENODEV;
 902                 goto err_lock;
 903         }
 904         if (!try_module_get(acpi_debugger.owner)) {
 905                 ret = -ENODEV;
 906                 goto err_lock;
 907         }
 908         func = acpi_debugger.ops->create_thread;
 909         owner = acpi_debugger.owner;
 910         mutex_unlock(&acpi_debugger.lock);
 911
 912         ret = func(function, context);
 913
 914         mutex_lock(&acpi_debugger.lock);
 915         module_put(owner);
 916 err_lock:
 917         mutex_unlock(&acpi_debugger.lock);
 918         return ret;
 919 }
 920
 921 ssize_t acpi_debugger_write_log(const char *msg)
 922 {
 923         ssize_t ret;
 924         ssize_t (*func)(const char *);
 925         struct module *owner;
 926
 927         if (!acpi_debugger_initialized)
 928                 return -ENODEV;
 929         mutex_lock(&acpi_debugger.lock);
 930         if (!acpi_debugger.ops) {
 931                 ret = -ENODEV;
 932                 goto err_lock;
 933         }
 934         if (!try_module_get(acpi_debugger.owner)) {
 935                 ret = -ENODEV;
 936                 goto err_lock;
 937         }
 938         func = acpi_debugger.ops->write_log;
 939         owner = acpi_debugger.owner;
 940         mutex_unlock(&acpi_debugger.lock);
 941
 942         ret = func(msg);
 943
 944         mutex_lock(&acpi_debugger.lock);
 945         module_put(owner);
 946 err_lock:
 947         mutex_unlock(&acpi_debugger.lock);
 948         return ret;
 949 }
 950
 951 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 952 {
 953         ssize_t ret;
 954         ssize_t (*func)(char *, size_t);
 955         struct module *owner;
 956
 957         if (!acpi_debugger_initialized)
 958                 return -ENODEV;
 959         mutex_lock(&acpi_debugger.lock);
 960         if (!acpi_debugger.ops) {
 961                 ret = -ENODEV;
 962                 goto err_lock;
 963         }
 964         if (!try_module_get(acpi_debugger.owner)) {
 965                 ret = -ENODEV;
 966                 goto err_lock;
 967         }
 968         func = acpi_debugger.ops->read_cmd;
 969         owner = acpi_debugger.owner;
 970         mutex_unlock(&acpi_debugger.lock);
 971
 972         ret = func(buffer, buffer_length);
 973
 974         mutex_lock(&acpi_debugger.lock);
 975         module_put(owner);
 976 err_lock:
 977         mutex_unlock(&acpi_debugger.lock);
 978         return ret;
 979 }
 980
 981 int acpi_debugger_wait_command_ready(void)
 982 {
 983         int ret;
 984         int (*func)(bool, char *, size_t);
 985         struct module *owner;
 986
 987         if (!acpi_debugger_initialized)
 988                 return -ENODEV;
 989         mutex_lock(&acpi_debugger.lock);
 990         if (!acpi_debugger.ops) {
 991                 ret = -ENODEV;
 992                 goto err_lock;
 993         }
 994         if (!try_module_get(acpi_debugger.owner)) {
 995                 ret = -ENODEV;
 996                 goto err_lock;
 997         }
 998         func = acpi_debugger.ops->wait_command_ready;
 999         owner = acpi_debugger.owner;
1000         mutex_unlock(&acpi_debugger.lock);
1001
1002         ret = func(acpi_gbl_method_executing,
1003                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1004
1005         mutex_lock(&acpi_debugger.lock);
1006         module_put(owner);
1007 err_lock:
1008         mutex_unlock(&acpi_debugger.lock);
1009         return ret;
1010 }
1011
1012 int acpi_debugger_notify_command_complete(void)
1013 {
1014         int ret;
1015         int (*func)(void);
1016         struct module *owner;
1017
1018         if (!acpi_debugger_initialized)
1019                 return -ENODEV;
1020         mutex_lock(&acpi_debugger.lock);
1021         if (!acpi_debugger.ops) {
1022                 ret = -ENODEV;
1023                 goto err_lock;
1024         }
1025         if (!try_module_get(acpi_debugger.owner)) {
1026                 ret = -ENODEV;
1027                 goto err_lock;
1028         }
1029         func = acpi_debugger.ops->notify_command_complete;
1030         owner = acpi_debugger.owner;
1031         mutex_unlock(&acpi_debugger.lock);
1032
1033         ret = func();
1034
1035         mutex_lock(&acpi_debugger.lock);
1036         module_put(owner);
1037 err_lock:
1038         mutex_unlock(&acpi_debugger.lock);
1039         return ret;
1040 }
1041
1042 int __init acpi_debugger_init(void)
1043 {
1044         mutex_init(&acpi_debugger.lock);
1045         acpi_debugger_initialized = true;
1046         return 0;
1047 }
1048 #endif
1049
1050 /*******************************************************************************
1051  *
1052  * FUNCTION:    acpi_os_execute
1053  *
1054  * PARAMETERS:  Type               - Type of the callback
1055  *              Function           - Function to be executed
1056  *              Context            - Function parameters
1057  *
1058  * RETURN:      Status
1059  *
1060  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1061  *              immediately executes function on a separate thread.
1062  *
1063  ******************************************************************************/
1064
1065 acpi_status acpi_os_execute(acpi_execute_type type,
1066                             acpi_osd_exec_callback function, void *context)
1067 {
1068         acpi_status status = AE_OK;
1069         struct acpi_os_dpc *dpc;
1070         struct workqueue_struct *queue;
1071         int ret;
1072         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1073                           "Scheduling function [%p(%p)] for deferred execution.\n",
1074                           function, context));
1075
1076         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1077                 ret = acpi_debugger_create_thread(function, context);
1078                 if (ret) {
1079                         pr_err("Call to kthread_create() failed.\n");
1080                         status = AE_ERROR;
1081                 }
1082                 goto out_thread;
1083         }
1084
1085         /*
1086          * Allocate/initialize DPC structure.  Note that this memory will be
1087          * freed by the callee.  The kernel handles the work_struct list  in a
1088          * way that allows us to also free its memory inside the callee.
1089          * Because we may want to schedule several tasks with different
1090          * parameters we can't use the approach some kernel code uses of
1091          * having a static work_struct.
1092          */
1093
1094         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1095         if (!dpc)
1096                 return AE_NO_MEMORY;
1097
1098         dpc->function = function;
1099         dpc->context = context;
1100
1101         /*
1102          * To prevent lockdep from complaining unnecessarily, make sure that
1103          * there is a different static lockdep key for each workqueue by using
1104          * INIT_WORK() for each of them separately.
1105          */
1106         if (type == OSL_NOTIFY_HANDLER) {
1107                 queue = kacpi_notify_wq;
1108                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1109         } else if (type == OSL_GPE_HANDLER) {
1110                 queue = kacpid_wq;
1111                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1112         } else {
1113                 pr_err("Unsupported os_execute type %d.\n", type);
1114                 status = AE_ERROR;
1115         }
1116
1117         if (ACPI_FAILURE(status))
1118                 goto err_workqueue;
1119
1120         /*
1121          * On some machines, a software-initiated SMI causes corruption unless
1122          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1123          * typically it's done in GPE-related methods that are run via
1124          * workqueues, so we can avoid the known corruption cases by always
1125          * queueing on CPU 0.
1126          */
1127         ret = queue_work_on(0, queue, &dpc->work);
1128         if (!ret) {
1129                 printk(KERN_ERR PREFIX
1130                           "Call to queue_work() failed.\n");
1131                 status = AE_ERROR;
1132         }
1133 err_workqueue:
1134         if (ACPI_FAILURE(status))
1135                 kfree(dpc);
1136 out_thread:
1137         return status;
1138 }
1139 EXPORT_SYMBOL(acpi_os_execute);
1140
1141 void acpi_os_wait_events_complete(void)
1142 {
1143         /*
1144          * Make sure the GPE handler or the fixed event handler is not used
1145          * on another CPU after removal.
1146          */
1147         if (acpi_sci_irq_valid())
1148                 synchronize_hardirq(acpi_sci_irq);
1149         flush_workqueue(kacpid_wq);
1150         flush_workqueue(kacpi_notify_wq);
1151 }
1152 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1153
1154 struct acpi_hp_work {
1155         struct work_struct work;
1156         struct acpi_device *adev;
1157         u32 src;
1158 };
1159
1160 static void acpi_hotplug_work_fn(struct work_struct *work)
1161 {
1162         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1163
1164         acpi_os_wait_events_complete();
1165         acpi_device_hotplug(hpw->adev, hpw->src);
1166         kfree(hpw);
1167 }
1168
1169 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1170 {
1171         struct acpi_hp_work *hpw;
1172
1173         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1174                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1175                   adev, src));
1176
1177         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1178         if (!hpw)
1179                 return AE_NO_MEMORY;
1180
1181         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1182         hpw->adev = adev;
1183         hpw->src = src;
1184         /*
1185          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1186          * the hotplug code may call driver .remove() functions, which may
1187          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1188          * these workqueues.
1189          */
1190         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1191                 kfree(hpw);
1192                 return AE_ERROR;
1193         }
1194         return AE_OK;
1195 }
1196
1197 bool acpi_queue_hotplug_work(struct work_struct *work)
1198 {
1199         return queue_work(kacpi_hotplug_wq, work);
1200 }
1201
1202 acpi_status
1203 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1204 {
1205         struct semaphore *sem = NULL;
1206
1207         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1208         if (!sem)
1209                 return AE_NO_MEMORY;
1210
1211         sema_init(sem, initial_units);
1212
1213         *handle = (acpi_handle *) sem;
1214
1215         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1216                           *handle, initial_units));
1217
1218         return AE_OK;
1219 }
1220
1221 /*
1222  * TODO: A better way to delete semaphores?  Linux doesn't have a
1223  * 'delete_semaphore()' function -- may result in an invalid
1224  * pointer dereference for non-synchronized consumers.  Should
1225  * we at least check for blocked threads and signal/cancel them?
1226  */
1227
1228 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1229 {
1230         struct semaphore *sem = (struct semaphore *)handle;
1231
1232         if (!sem)
1233                 return AE_BAD_PARAMETER;
1234
1235         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1236
1237         BUG_ON(!list_empty(&sem->wait_list));
1238         kfree(sem);
1239         sem = NULL;
1240
1241         return AE_OK;
1242 }
1243
1244 /*
1245  * TODO: Support for units > 1?
1246  */
1247 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1248 {
1249         acpi_status status = AE_OK;
1250         struct semaphore *sem = (struct semaphore *)handle;
1251         long jiffies;
1252         int ret = 0;
1253
1254         if (!acpi_os_initialized)
1255                 return AE_OK;
1256
1257         if (!sem || (units < 1))
1258                 return AE_BAD_PARAMETER;
1259
1260         if (units > 1)
1261                 return AE_SUPPORT;
1262
1263         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1264                           handle, units, timeout));
1265
1266         if (timeout == ACPI_WAIT_FOREVER)
1267                 jiffies = MAX_SCHEDULE_TIMEOUT;
1268         else
1269                 jiffies = msecs_to_jiffies(timeout);
1270
1271         ret = down_timeout(sem, jiffies);
1272         if (ret)
1273                 status = AE_TIME;
1274
1275         if (ACPI_FAILURE(status)) {
1276                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1277                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1278                                   handle, units, timeout,
1279                                   acpi_format_exception(status)));
1280         } else {
1281                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1282                                   "Acquired semaphore[%p|%d|%d]", handle,
1283                                   units, timeout));
1284         }
1285
1286         return status;
1287 }
1288
1289 /*
1290  * TODO: Support for units > 1?
1291  */
1292 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1293 {
1294         struct semaphore *sem = (struct semaphore *)handle;
1295
1296         if (!acpi_os_initialized)
1297                 return AE_OK;
1298
1299         if (!sem || (units < 1))
1300                 return AE_BAD_PARAMETER;
1301
1302         if (units > 1)
1303                 return AE_SUPPORT;
1304
1305         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1306                           units));
1307
1308         up(sem);
1309
1310         return AE_OK;
1311 }
1312
1313 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1314 {
1315 #ifdef ENABLE_DEBUGGER
1316         if (acpi_in_debugger) {
1317                 u32 chars;
1318
1319                 kdb_read(buffer, buffer_length);
1320
1321                 /* remove the CR kdb includes */
1322                 chars = strlen(buffer) - 1;
1323                 buffer[chars] = '\0';
1324         }
1325 #else
1326         int ret;
1327
1328         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1329         if (ret < 0)
1330                 return AE_ERROR;
1331         if (bytes_read)
1332                 *bytes_read = ret;
1333 #endif
1334
1335         return AE_OK;
1336 }
1337 EXPORT_SYMBOL(acpi_os_get_line);
1338
1339 acpi_status acpi_os_wait_command_ready(void)
1340 {
1341         int ret;
1342
1343         ret = acpi_debugger_wait_command_ready();
1344         if (ret < 0)
1345                 return AE_ERROR;
1346         return AE_OK;
1347 }
1348
1349 acpi_status acpi_os_notify_command_complete(void)
1350 {
1351         int ret;
1352
1353         ret = acpi_debugger_notify_command_complete();
1354         if (ret < 0)
1355                 return AE_ERROR;
1356         return AE_OK;
1357 }
1358
1359 acpi_status acpi_os_signal(u32 function, void *info)
1360 {
1361         switch (function) {
1362         case ACPI_SIGNAL_FATAL:
1363                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1364                 break;
1365         case ACPI_SIGNAL_BREAKPOINT:
1366                 /*
1367                  * AML Breakpoint
1368                  * ACPI spec. says to treat it as a NOP unless
1369                  * you are debugging.  So if/when we integrate
1370                  * AML debugger into the kernel debugger its
1371                  * hook will go here.  But until then it is
1372                  * not useful to print anything on breakpoints.
1373                  */
1374                 break;
1375         default:
1376                 break;
1377         }
1378
1379         return AE_OK;
1380 }
1381
1382 static int __init acpi_os_name_setup(char *str)
1383 {
1384         char *p = acpi_os_name;
1385         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1386
1387         if (!str || !*str)
1388                 return 0;
1389
1390         for (; count-- && *str; str++) {
1391                 if (isalnum(*str) || *str == ' ' || *str == ':')
1392                         *p++ = *str;
1393                 else if (*str == '\'' || *str == '"')
1394                         continue;
1395                 else
1396                         break;
1397         }
1398         *p = 0;
1399
1400         return 1;
1401
1402 }
1403
1404 __setup("acpi_os_name=", acpi_os_name_setup);
1405
1406 /*
1407  * Disable the auto-serialization of named objects creation methods.
1408  *
1409  * This feature is enabled by default.  It marks the AML control methods
1410  * that contain the opcodes to create named objects as "Serialized".
1411  */
1412 static int __init acpi_no_auto_serialize_setup(char *str)
1413 {
1414         acpi_gbl_auto_serialize_methods = FALSE;
1415         pr_info("ACPI: auto-serialization disabled\n");
1416
1417         return 1;
1418 }
1419
1420 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1421
1422 /* Check of resource interference between native drivers and ACPI
1423  * OperationRegions (SystemIO and System Memory only).
1424  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1425  * in arbitrary AML code and can interfere with legacy drivers.
1426  * acpi_enforce_resources= can be set to:
1427  *
1428  *   - strict (default) (2)
1429  *     -> further driver trying to access the resources will not load
1430  *   - lax              (1)
1431  *     -> further driver trying to access the resources will load, but you
1432  *     get a system message that something might go wrong...
1433  *
1434  *   - no               (0)
1435  *     -> ACPI Operation Region resources will not be registered
1436  *
1437  */
1438 #define ENFORCE_RESOURCES_STRICT 2
1439 #define ENFORCE_RESOURCES_LAX    1
1440 #define ENFORCE_RESOURCES_NO     0
1441
1442 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1443
1444 static int __init acpi_enforce_resources_setup(char *str)
1445 {
1446         if (str == NULL || *str == '\0')
1447                 return 0;
1448
1449         if (!strcmp("strict", str))
1450                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1451         else if (!strcmp("lax", str))
1452                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1453         else if (!strcmp("no", str))
1454                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1455
1456         return 1;
1457 }
1458
1459 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1460
1461 /* Check for resource conflicts between ACPI OperationRegions and native
1462  * drivers */
1463 int acpi_check_resource_conflict(const struct resource *res)
1464 {
1465         acpi_adr_space_type space_id;
1466         acpi_size length;
1467         u8 warn = 0;
1468         int clash = 0;
1469
1470         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1471                 return 0;
1472         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1473                 return 0;
1474
1475         if (res->flags & IORESOURCE_IO)
1476                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1477         else
1478                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1479
1480         length = resource_size(res);
1481         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1482                 warn = 1;
1483         clash = acpi_check_address_range(space_id, res->start, length, warn);
1484
1485         if (clash) {
1486                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1487                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1488                                 printk(KERN_NOTICE "ACPI: This conflict may"
1489                                        " cause random problems and system"
1490                                        " instability\n");
1491                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1492                                " for this device, you should use it instead of"
1493                                " the native driver\n");
1494                 }
1495                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1496                         return -EBUSY;
1497         }
1498         return 0;
1499 }
1500 EXPORT_SYMBOL(acpi_check_resource_conflict);
1501
1502 int acpi_check_region(resource_size_t start, resource_size_t n,
1503                       const char *name)
1504 {
1505         struct resource res = {
1506                 .start = start,
1507                 .end   = start + n - 1,
1508                 .name  = name,
1509                 .flags = IORESOURCE_IO,
1510         };
1511
1512         return acpi_check_resource_conflict(&res);
1513 }
1514 EXPORT_SYMBOL(acpi_check_region);
1515
1516 static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1517                                               void *_res, void **return_value)
1518 {
1519         struct acpi_mem_space_context **mem_ctx;
1520         union acpi_operand_object *handler_obj;
1521         union acpi_operand_object *region_obj2;
1522         union acpi_operand_object *region_obj;
1523         struct resource *res = _res;
1524         acpi_status status;
1525
1526         region_obj = acpi_ns_get_attached_object(handle);
1527         if (!region_obj)
1528                 return AE_OK;
1529
1530         handler_obj = region_obj->region.handler;
1531         if (!handler_obj)
1532                 return AE_OK;
1533
1534         if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1535                 return AE_OK;
1536
1537         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1538                 return AE_OK;
1539
1540         region_obj2 = acpi_ns_get_secondary_object(region_obj);
1541         if (!region_obj2)
1542                 return AE_OK;
1543
1544         mem_ctx = (void *)&region_obj2->extra.region_context;
1545
1546         if (!(mem_ctx[0]->address >= res->start &&
1547               mem_ctx[0]->address < res->end))
1548                 return AE_OK;
1549
1550         status = handler_obj->address_space.setup(region_obj,
1551                                                   ACPI_REGION_DEACTIVATE,
1552                                                   NULL, (void **)mem_ctx);
1553         if (ACPI_SUCCESS(status))
1554                 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1555
1556         return status;
1557 }
1558
1559 /**
1560  * acpi_release_memory - Release any mappings done to a memory region
1561  * @handle: Handle to namespace node
1562  * @res: Memory resource
1563  * @level: A level that terminates the search
1564  *
1565  * Walks through @handle and unmaps all SystemMemory Operation Regions that
1566  * overlap with @res and that have already been activated (mapped).
1567  *
1568  * This is a helper that allows drivers to place special requirements on memory
1569  * region that may overlap with operation regions, primarily allowing them to
1570  * safely map the region as non-cached memory.
1571  *
1572  * The unmapped Operation Regions will be automatically remapped next time they
1573  * are called, so the drivers do not need to do anything else.
1574  */
1575 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1576                                 u32 level)
1577 {
1578         acpi_status status;
1579
1580         if (!(res->flags & IORESOURCE_MEM))
1581                 return AE_TYPE;
1582
1583         status = acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1584                                      acpi_deactivate_mem_region, NULL,
1585                                      res, NULL);
1586         if (ACPI_FAILURE(status))
1587                 return status;
1588
1589         /*
1590          * Wait for all of the mappings queued up for removal by
1591          * acpi_deactivate_mem_region() to actually go away.
1592          */
1593         synchronize_rcu();
1594         rcu_barrier();
1595         flush_scheduled_work();
1596
1597         return AE_OK;
1598 }
1599 EXPORT_SYMBOL_GPL(acpi_release_memory);
1600
1601 /*
1602  * Let drivers know whether the resource checks are effective
1603  */
1604 int acpi_resources_are_enforced(void)
1605 {
1606         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1607 }
1608 EXPORT_SYMBOL(acpi_resources_are_enforced);
1609
1610 /*
1611  * Deallocate the memory for a spinlock.
1612  */
1613 void acpi_os_delete_lock(acpi_spinlock handle)
1614 {
1615         ACPI_FREE(handle);
1616 }
1617
1618 /*
1619  * Acquire a spinlock.
1620  *
1621  * handle is a pointer to the spinlock_t.
1622  */
1623
1624 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1625         __acquires(lockp)
1626 {
1627         acpi_cpu_flags flags;
1628         spin_lock_irqsave(lockp, flags);
1629         return flags;
1630 }
1631
1632 /*
1633  * Release a spinlock. See above.
1634  */
1635
1636 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1637         __releases(lockp)
1638 {
1639         spin_unlock_irqrestore(lockp, flags);
1640 }
1641
1642 #ifndef ACPI_USE_LOCAL_CACHE
1643
1644 /*******************************************************************************
1645  *
1646  * FUNCTION:    acpi_os_create_cache
1647  *
1648  * PARAMETERS:  name      - Ascii name for the cache
1649  *              size      - Size of each cached object
1650  *              depth     - Maximum depth of the cache (in objects) <ignored>
1651  *              cache     - Where the new cache object is returned
1652  *
1653  * RETURN:      status
1654  *
1655  * DESCRIPTION: Create a cache object
1656  *
1657  ******************************************************************************/
1658
1659 acpi_status
1660 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1661 {
1662         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1663         if (*cache == NULL)
1664                 return AE_ERROR;
1665         else
1666                 return AE_OK;
1667 }
1668
1669 /*******************************************************************************
1670  *
1671  * FUNCTION:    acpi_os_purge_cache
1672  *
1673  * PARAMETERS:  Cache           - Handle to cache object
1674  *
1675  * RETURN:      Status
1676  *
1677  * DESCRIPTION: Free all objects within the requested cache.
1678  *
1679  ******************************************************************************/
1680
1681 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1682 {
1683         kmem_cache_shrink(cache);
1684         return (AE_OK);
1685 }
1686
1687 /*******************************************************************************
1688  *
1689  * FUNCTION:    acpi_os_delete_cache
1690  *
1691  * PARAMETERS:  Cache           - Handle to cache object
1692  *
1693  * RETURN:      Status
1694  *
1695  * DESCRIPTION: Free all objects within the requested cache and delete the
1696  *              cache object.
1697  *
1698  ******************************************************************************/
1699
1700 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1701 {
1702         kmem_cache_destroy(cache);
1703         return (AE_OK);
1704 }
1705
1706 /*******************************************************************************
1707  *
1708  * FUNCTION:    acpi_os_release_object
1709  *
1710  * PARAMETERS:  Cache       - Handle to cache object
1711  *              Object      - The object to be released
1712  *
1713  * RETURN:      None
1714  *
1715  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1716  *              the object is deleted.
1717  *
1718  ******************************************************************************/
1719
1720 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1721 {
1722         kmem_cache_free(cache, object);
1723         return (AE_OK);
1724 }
1725 #endif
1726
1727 static int __init acpi_no_static_ssdt_setup(char *s)
1728 {
1729         acpi_gbl_disable_ssdt_table_install = TRUE;
1730         pr_info("ACPI: static SSDT installation disabled\n");
1731
1732         return 0;
1733 }
1734
1735 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1736
1737 static int __init acpi_disable_return_repair(char *s)
1738 {
1739         printk(KERN_NOTICE PREFIX
1740                "ACPI: Predefined validation mechanism disabled\n");
1741         acpi_gbl_disable_auto_repair = TRUE;
1742
1743         return 1;
1744 }
1745
1746 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1747
1748 acpi_status __init acpi_os_initialize(void)
1749 {
1750         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1751         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1752         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1753         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1754         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1755                 /*
1756                  * Use acpi_os_map_generic_address to pre-map the reset
1757                  * register if it's in system memory.
1758                  */
1759                 int rv;
1760
1761                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1762                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1763         }
1764         acpi_os_initialized = true;
1765
1766         return AE_OK;
1767 }
1768
1769 acpi_status __init acpi_os_initialize1(void)
1770 {
1771         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1772         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1773         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1774         BUG_ON(!kacpid_wq);
1775         BUG_ON(!kacpi_notify_wq);
1776         BUG_ON(!kacpi_hotplug_wq);
1777         acpi_osi_init();
1778         return AE_OK;
1779 }
1780
1781 acpi_status acpi_os_terminate(void)
1782 {
1783         if (acpi_irq_handler) {
1784                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1785                                                  acpi_irq_handler);
1786         }
1787
1788         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1789         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1790         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1791         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1792         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1793                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1794
1795         destroy_workqueue(kacpid_wq);
1796         destroy_workqueue(kacpi_notify_wq);
1797         destroy_workqueue(kacpi_hotplug_wq);
1798
1799         return AE_OK;
1800 }
1801
1802 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1803                                   u32 pm1b_control)
1804 {
1805         int rc = 0;
1806         if (__acpi_os_prepare_sleep)
1807                 rc = __acpi_os_prepare_sleep(sleep_state,
1808                                              pm1a_control, pm1b_control);
1809         if (rc < 0)
1810                 return AE_ERROR;
1811         else if (rc > 0)
1812                 return AE_CTRL_TERMINATE;
1813
1814         return AE_OK;
1815 }
1816
1817 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1818                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1819 {
1820         __acpi_os_prepare_sleep = func;
1821 }
1822
1823 #if (ACPI_REDUCED_HARDWARE)
1824 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1825                                   u32 val_b)
1826 {
1827         int rc = 0;
1828         if (__acpi_os_prepare_extended_sleep)
1829                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1830                                              val_a, val_b);
1831         if (rc < 0)
1832                 return AE_ERROR;
1833         else if (rc > 0)
1834                 return AE_CTRL_TERMINATE;
1835
1836         return AE_OK;
1837 }
1838 #else
1839 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1840                                   u32 val_b)
1841 {
1842         return AE_OK;
1843 }
1844 #endif
1845
1846 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1847                                u32 val_a, u32 val_b))
1848 {
1849         __acpi_os_prepare_extended_sleep = func;
1850 }
1851
1852 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1853                                 u32 reg_a_value, u32 reg_b_value)
1854 {
1855         acpi_status status;
1856
1857         if (acpi_gbl_reduced_hardware)
1858                 status = acpi_os_prepare_extended_sleep(sleep_state,
1859                                                         reg_a_value,
1860                                                         reg_b_value);
1861         else
1862                 status = acpi_os_prepare_sleep(sleep_state,
1863                                                reg_a_value, reg_b_value);
1864         return status;
1865 }