drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pci.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kmod.h>
  34 #include <linux/delay.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/nmi.h>
  37 #include <linux/acpi.h>
  38 #include <linux/efi.h>
  39 #include <linux/ioport.h>
  40 #include <linux/list.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/semaphore.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/io-64-nonatomic-lo-hi.h>
  47
  48 #include "internal.h"
  49
  50 #define _COMPONENT              ACPI_OS_SERVICES
  51 ACPI_MODULE_NAME("osl");
  52
  53 struct acpi_os_dpc {
  54         acpi_osd_exec_callback function;
  55         void *context;
  56         struct work_struct work;
  57 };
  58
  59 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  61 #endif
  62
  63 #ifdef ENABLE_DEBUGGER
  64 #include <linux/kdb.h>
  65
  66 /* stuff for debugger support */
  67 int acpi_in_debugger;
  68 EXPORT_SYMBOL(acpi_in_debugger);
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  72                                       u32 pm1b_ctrl);
  73 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  74                                       u32 val_b);
  75
  76 static acpi_osd_handler acpi_irq_handler;
  77 static void *acpi_irq_context;
  78 static struct workqueue_struct *kacpid_wq;
  79 static struct workqueue_struct *kacpi_notify_wq;
  80 static struct workqueue_struct *kacpi_hotplug_wq;
  81 static bool acpi_os_initialized;
  82 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  83
  84 /*
  85  * This list of permanent mappings is for memory that may be accessed from
  86  * interrupt context, where we can't do the ioremap().
  87  */
  88 struct acpi_ioremap {
  89         struct list_head list;
  90         void __iomem *virt;
  91         acpi_physical_address phys;
  92         acpi_size size;
  93         unsigned long refcount;
  94 };
  95
  96 static LIST_HEAD(acpi_ioremaps);
  97 static DEFINE_MUTEX(acpi_ioremap_lock);
  98
  99 static void __init acpi_osi_setup_late(void);
 100
 101 /*
 102  * The story of _OSI(Linux)
 103  *
 104  * From pre-history through Linux-2.6.22,
 105  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 106  *
 107  * Unfortunately, reference BIOS writers got wind of this
 108  * and put OSI(Linux) in their example code, quickly exposing
 109  * this string as ill-conceived and opening the door to
 110  * an un-bounded number of BIOS incompatibilities.
 111  *
 112  * For example, OSI(Linux) was used on resume to re-POST a
 113  * video card on one system, because Linux at that time
 114  * could not do a speedy restore in its native driver.
 115  * But then upon gaining quick native restore capability,
 116  * Linux has no way to tell the BIOS to skip the time-consuming
 117  * POST -- putting Linux at a permanent performance disadvantage.
 118  * On another system, the BIOS writer used OSI(Linux)
 119  * to infer native OS support for IPMI!  On other systems,
 120  * OSI(Linux) simply got in the way of Linux claiming to
 121  * be compatible with other operating systems, exposing
 122  * BIOS issues such as skipped device initialization.
 123  *
 124  * So "Linux" turned out to be a really poor chose of
 125  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 126  *
 127  * BIOS writers should NOT query _OSI(Linux) on future systems.
 128  * Linux will complain on the console when it sees it, and return FALSE.
 129  * To get Linux to return TRUE for your system  will require
 130  * a kernel source update to add a DMI entry,
 131  * or boot with "acpi_osi=Linux"
 132  */
 133
 134 static struct osi_linux {
 135         unsigned int    enable:1;
 136         unsigned int    dmi:1;
 137         unsigned int    cmdline:1;
 138         u8              default_disabling;
 139 } osi_linux = {0, 0, 0, 0};
 140
 141 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 142 {
 143         if (!strcmp("Linux", interface)) {
 144
 145                 printk_once(KERN_NOTICE FW_BUG PREFIX
 146                         "BIOS _OSI(Linux) query %s%s\n",
 147                         osi_linux.enable ? "honored" : "ignored",
 148                         osi_linux.cmdline ? " via cmdline" :
 149                         osi_linux.dmi ? " via DMI" : "");
 150         }
 151
 152         if (!strcmp("Darwin", interface)) {
 153                 /*
 154                  * Apple firmware will behave poorly if it receives positive
 155                  * answers to "Darwin" and any other OS. Respond positively
 156                  * to Darwin and then disable all other vendor strings.
 157                  */
 158                 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
 159                 supported = ACPI_UINT32_MAX;
 160         }
 161
 162         return supported;
 163 }
 164
 165 static void __init acpi_request_region (struct acpi_generic_address *gas,
 166         unsigned int length, char *desc)
 167 {
 168         u64 addr;
 169
 170         /* Handle possible alignment issues */
 171         memcpy(&addr, &gas->address, sizeof(addr));
 172         if (!addr || !length)
 173                 return;
 174
 175         /* Resources are never freed */
 176         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 177                 request_region(addr, length, desc);
 178         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 179                 request_mem_region(addr, length, desc);
 180 }
 181
 182 static int __init acpi_reserve_resources(void)
 183 {
 184         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 185                 "ACPI PM1a_EVT_BLK");
 186
 187         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 188                 "ACPI PM1b_EVT_BLK");
 189
 190         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 191                 "ACPI PM1a_CNT_BLK");
 192
 193         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 194                 "ACPI PM1b_CNT_BLK");
 195
 196         if (acpi_gbl_FADT.pm_timer_length == 4)
 197                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 198
 199         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 200                 "ACPI PM2_CNT_BLK");
 201
 202         /* Length of GPE blocks must be a non-negative multiple of 2 */
 203
 204         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 205                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 206                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 207
 208         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 209                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 210                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 211
 212         return 0;
 213 }
 214 fs_initcall_sync(acpi_reserve_resources);
 215
 216 void acpi_os_printf(const char *fmt, ...)
 217 {
 218         va_list args;
 219         va_start(args, fmt);
 220         acpi_os_vprintf(fmt, args);
 221         va_end(args);
 222 }
 223
 224 void acpi_os_vprintf(const char *fmt, va_list args)
 225 {
 226         static char buffer[512];
 227
 228         vsprintf(buffer, fmt, args);
 229
 230 #ifdef ENABLE_DEBUGGER
 231         if (acpi_in_debugger) {
 232                 kdb_printf("%s", buffer);
 233         } else {
 234                 printk(KERN_CONT "%s", buffer);
 235         }
 236 #else
 237         printk(KERN_CONT "%s", buffer);
 238 #endif
 239 }
 240
 241 #ifdef CONFIG_KEXEC
 242 static unsigned long acpi_rsdp;
 243 static int __init setup_acpi_rsdp(char *arg)
 244 {
 245         if (kstrtoul(arg, 16, &acpi_rsdp))
 246                 return -EINVAL;
 247         return 0;
 248 }
 249 early_param("acpi_rsdp", setup_acpi_rsdp);
 250 #endif
 251
 252 acpi_physical_address __init acpi_os_get_root_pointer(void)
 253 {
 254 #ifdef CONFIG_KEXEC
 255         if (acpi_rsdp)
 256                 return acpi_rsdp;
 257 #endif
 258
 259         if (efi_enabled(EFI_CONFIG_TABLES)) {
 260                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 261                         return efi.acpi20;
 262                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 263                         return efi.acpi;
 264                 else {
 265                         printk(KERN_ERR PREFIX
 266                                "System description tables not found\n");
 267                         return 0;
 268                 }
 269         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 270                 acpi_physical_address pa = 0;
 271
 272                 acpi_find_root_pointer(&pa);
 273                 return pa;
 274         }
 275
 276         return 0;
 277 }
 278
 279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 280 static struct acpi_ioremap *
 281 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 282 {
 283         struct acpi_ioremap *map;
 284
 285         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 286                 if (map->phys <= phys &&
 287                     phys + size <= map->phys + map->size)
 288                         return map;
 289
 290         return NULL;
 291 }
 292
 293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 294 static void __iomem *
 295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 296 {
 297         struct acpi_ioremap *map;
 298
 299         map = acpi_map_lookup(phys, size);
 300         if (map)
 301                 return map->virt + (phys - map->phys);
 302
 303         return NULL;
 304 }
 305
 306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 307 {
 308         struct acpi_ioremap *map;
 309         void __iomem *virt = NULL;
 310
 311         mutex_lock(&acpi_ioremap_lock);
 312         map = acpi_map_lookup(phys, size);
 313         if (map) {
 314                 virt = map->virt + (phys - map->phys);
 315                 map->refcount++;
 316         }
 317         mutex_unlock(&acpi_ioremap_lock);
 318         return virt;
 319 }
 320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 321
 322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 323 static struct acpi_ioremap *
 324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 325 {
 326         struct acpi_ioremap *map;
 327
 328         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 329                 if (map->virt <= virt &&
 330                     virt + size <= map->virt + map->size)
 331                         return map;
 332
 333         return NULL;
 334 }
 335
 336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 337 /* ioremap will take care of cache attributes */
 338 #define should_use_kmap(pfn)   0
 339 #else
 340 #define should_use_kmap(pfn)   page_is_ram(pfn)
 341 #endif
 342
 343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 344 {
 345         unsigned long pfn;
 346
 347         pfn = pg_off >> PAGE_SHIFT;
 348         if (should_use_kmap(pfn)) {
 349                 if (pg_sz > PAGE_SIZE)
 350                         return NULL;
 351                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 352         } else
 353                 return acpi_os_ioremap(pg_off, pg_sz);
 354 }
 355
 356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 357 {
 358         unsigned long pfn;
 359
 360         pfn = pg_off >> PAGE_SHIFT;
 361         if (should_use_kmap(pfn))
 362                 kunmap(pfn_to_page(pfn));
 363         else
 364                 iounmap(vaddr);
 365 }
 366
 367 void __iomem *__init_refok
 368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 369 {
 370         struct acpi_ioremap *map;
 371         void __iomem *virt;
 372         acpi_physical_address pg_off;
 373         acpi_size pg_sz;
 374
 375         if (phys > ULONG_MAX) {
 376                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 377                 return NULL;
 378         }
 379
 380         if (!acpi_gbl_permanent_mmap)
 381                 return __acpi_map_table((unsigned long)phys, size);
 382
 383         mutex_lock(&acpi_ioremap_lock);
 384         /* Check if there's a suitable mapping already. */
 385         map = acpi_map_lookup(phys, size);
 386         if (map) {
 387                 map->refcount++;
 388                 goto out;
 389         }
 390
 391         map = kzalloc(sizeof(*map), GFP_KERNEL);
 392         if (!map) {
 393                 mutex_unlock(&acpi_ioremap_lock);
 394                 return NULL;
 395         }
 396
 397         pg_off = round_down(phys, PAGE_SIZE);
 398         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 399         virt = acpi_map(pg_off, pg_sz);
 400         if (!virt) {
 401                 mutex_unlock(&acpi_ioremap_lock);
 402                 kfree(map);
 403                 return NULL;
 404         }
 405
 406         INIT_LIST_HEAD(&map->list);
 407         map->virt = virt;
 408         map->phys = pg_off;
 409         map->size = pg_sz;
 410         map->refcount = 1;
 411
 412         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 413
 414 out:
 415         mutex_unlock(&acpi_ioremap_lock);
 416         return map->virt + (phys - map->phys);
 417 }
 418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 419
 420 void *__init_refok
 421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 422 {
 423         return (void *)acpi_os_map_iomem(phys, size);
 424 }
 425 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 426
 427 /* Must be called with mutex_lock(&acpi_ioremap_lock) */
 428 static unsigned long acpi_os_drop_map_ref(struct acpi_ioremap *map)
 429 {
 430         unsigned long refcount = --map->refcount;
 431
 432         if (!refcount)
 433                 list_del_rcu(&map->list);
 434         return refcount;
 435 }
 436
 437 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 438 {
 439         synchronize_rcu_expedited();
 440         acpi_unmap(map->phys, map->virt);
 441         kfree(map);
 442 }
 443
 444 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 445 {
 446         struct acpi_ioremap *map;
 447         unsigned long refcount;
 448
 449         if (!acpi_gbl_permanent_mmap) {
 450                 __acpi_unmap_table(virt, size);
 451                 return;
 452         }
 453
 454         mutex_lock(&acpi_ioremap_lock);
 455         map = acpi_map_lookup_virt(virt, size);
 456         if (!map) {
 457                 mutex_unlock(&acpi_ioremap_lock);
 458                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 459                 return;
 460         }
 461         refcount = acpi_os_drop_map_ref(map);
 462         mutex_unlock(&acpi_ioremap_lock);
 463
 464         if (!refcount)
 465                 acpi_os_map_cleanup(map);
 466 }
 467 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 468
 469 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 470 {
 471         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 472 }
 473 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 474
 475 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 476 {
 477         if (!acpi_gbl_permanent_mmap)
 478                 __acpi_unmap_table(virt, size);
 479 }
 480
 481 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 482 {
 483         u64 addr;
 484         void __iomem *virt;
 485
 486         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 487                 return 0;
 488
 489         /* Handle possible alignment issues */
 490         memcpy(&addr, &gas->address, sizeof(addr));
 491         if (!addr || !gas->bit_width)
 492                 return -EINVAL;
 493
 494         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 495         if (!virt)
 496                 return -EIO;
 497
 498         return 0;
 499 }
 500 EXPORT_SYMBOL(acpi_os_map_generic_address);
 501
 502 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 503 {
 504         u64 addr;
 505         struct acpi_ioremap *map;
 506         unsigned long refcount;
 507
 508         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 509                 return;
 510
 511         /* Handle possible alignment issues */
 512         memcpy(&addr, &gas->address, sizeof(addr));
 513         if (!addr || !gas->bit_width)
 514                 return;
 515
 516         mutex_lock(&acpi_ioremap_lock);
 517         map = acpi_map_lookup(addr, gas->bit_width / 8);
 518         if (!map) {
 519                 mutex_unlock(&acpi_ioremap_lock);
 520                 return;
 521         }
 522         refcount = acpi_os_drop_map_ref(map);
 523         mutex_unlock(&acpi_ioremap_lock);
 524
 525         if (!refcount)
 526                 acpi_os_map_cleanup(map);
 527 }
 528 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 529
 530 #ifdef ACPI_FUTURE_USAGE
 531 acpi_status
 532 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 533 {
 534         if (!phys || !virt)
 535                 return AE_BAD_PARAMETER;
 536
 537         *phys = virt_to_phys(virt);
 538
 539         return AE_OK;
 540 }
 541 #endif
 542
 543 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 544 static bool acpi_rev_override;
 545
 546 int __init acpi_rev_override_setup(char *str)
 547 {
 548         acpi_rev_override = true;
 549         return 1;
 550 }
 551 __setup("acpi_rev_override", acpi_rev_override_setup);
 552 #else
 553 #define acpi_rev_override       false
 554 #endif
 555
 556 #define ACPI_MAX_OVERRIDE_LEN 100
 557
 558 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 559
 560 acpi_status
 561 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 562                             char **new_val)
 563 {
 564         if (!init_val || !new_val)
 565                 return AE_BAD_PARAMETER;
 566
 567         *new_val = NULL;
 568         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 569                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 570                        acpi_os_name);
 571                 *new_val = acpi_os_name;
 572         }
 573
 574         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 575                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 576                 *new_val = (char *)5;
 577         }
 578
 579         return AE_OK;
 580 }
 581
 582 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 583 #include <linux/earlycpio.h>
 584 #include <linux/memblock.h>
 585
 586 static u64 acpi_tables_addr;
 587 static int all_tables_size;
 588
 589 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 590 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 591 {
 592         u8 sum = 0;
 593         u8 *end = buffer + length;
 594
 595         while (buffer < end)
 596                 sum = (u8) (sum + *(buffer++));
 597         return sum;
 598 }
 599
 600 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 601 static const char * const table_sigs[] = {
 602         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 603         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 604         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 605         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 606         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 607         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 608         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 609         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 610         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 611
 612 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 613
 614 #define ACPI_OVERRIDE_TABLES 64
 615 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 616
 617 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 618
 619 void __init acpi_initrd_override(void *data, size_t size)
 620 {
 621         int sig, no, table_nr = 0, total_offset = 0;
 622         long offset = 0;
 623         struct acpi_table_header *table;
 624         char cpio_path[32] = "kernel/firmware/acpi/";
 625         struct cpio_data file;
 626
 627         if (data == NULL || size == 0)
 628                 return;
 629
 630         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 631                 file = find_cpio_data(cpio_path, data, size, &offset);
 632                 if (!file.data)
 633                         break;
 634
 635                 data += offset;
 636                 size -= offset;
 637
 638                 if (file.size < sizeof(struct acpi_table_header)) {
 639                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 640                                 cpio_path, file.name);
 641                         continue;
 642                 }
 643
 644                 table = file.data;
 645
 646                 for (sig = 0; table_sigs[sig]; sig++)
 647                         if (!memcmp(table->signature, table_sigs[sig], 4))
 648                                 break;
 649
 650                 if (!table_sigs[sig]) {
 651                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 652                                 cpio_path, file.name);
 653                         continue;
 654                 }
 655                 if (file.size != table->length) {
 656                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 657                                 cpio_path, file.name);
 658                         continue;
 659                 }
 660                 if (acpi_table_checksum(file.data, table->length)) {
 661                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 662                                 cpio_path, file.name);
 663                         continue;
 664                 }
 665
 666                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 667                         table->signature, cpio_path, file.name, table->length);
 668
 669                 all_tables_size += table->length;
 670                 acpi_initrd_files[table_nr].data = file.data;
 671                 acpi_initrd_files[table_nr].size = file.size;
 672                 table_nr++;
 673         }
 674         if (table_nr == 0)
 675                 return;
 676
 677         acpi_tables_addr =
 678                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 679                                        all_tables_size, PAGE_SIZE);
 680         if (!acpi_tables_addr) {
 681                 WARN_ON(1);
 682                 return;
 683         }
 684         /*
 685          * Only calling e820_add_reserve does not work and the
 686          * tables are invalid (memory got used) later.
 687          * memblock_reserve works as expected and the tables won't get modified.
 688          * But it's not enough on X86 because ioremap will
 689          * complain later (used by acpi_os_map_memory) that the pages
 690          * that should get mapped are not marked "reserved".
 691          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 692          * works fine.
 693          */
 694         memblock_reserve(acpi_tables_addr, all_tables_size);
 695         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 696
 697         /*
 698          * early_ioremap only can remap 256k one time. If we map all
 699          * tables one time, we will hit the limit. Need to map chunks
 700          * one by one during copying the same as that in relocate_initrd().
 701          */
 702         for (no = 0; no < table_nr; no++) {
 703                 unsigned char *src_p = acpi_initrd_files[no].data;
 704                 phys_addr_t size = acpi_initrd_files[no].size;
 705                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 706                 phys_addr_t slop, clen;
 707                 char *dest_p;
 708
 709                 total_offset += size;
 710
 711                 while (size) {
 712                         slop = dest_addr & ~PAGE_MASK;
 713                         clen = size;
 714                         if (clen > MAP_CHUNK_SIZE - slop)
 715                                 clen = MAP_CHUNK_SIZE - slop;
 716                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 717                                                  clen + slop);
 718                         memcpy(dest_p + slop, src_p, clen);
 719                         early_iounmap(dest_p, clen + slop);
 720                         src_p += clen;
 721                         dest_addr += clen;
 722                         size -= clen;
 723                 }
 724         }
 725 }
 726 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 727
 728 static void acpi_table_taint(struct acpi_table_header *table)
 729 {
 730         pr_warn(PREFIX
 731                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 732                 table->signature, table->oem_table_id);
 733         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 734 }
 735
 736
 737 acpi_status
 738 acpi_os_table_override(struct acpi_table_header * existing_table,
 739                        struct acpi_table_header ** new_table)
 740 {
 741         if (!existing_table || !new_table)
 742                 return AE_BAD_PARAMETER;
 743
 744         *new_table = NULL;
 745
 746 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 747         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 748                 *new_table = (struct acpi_table_header *)AmlCode;
 749 #endif
 750         if (*new_table != NULL)
 751                 acpi_table_taint(existing_table);
 752         return AE_OK;
 753 }
 754
 755 acpi_status
 756 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 757                                 acpi_physical_address *address,
 758                                 u32 *table_length)
 759 {
 760 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 761         *table_length = 0;
 762         *address = 0;
 763         return AE_OK;
 764 #else
 765         int table_offset = 0;
 766         struct acpi_table_header *table;
 767
 768         *table_length = 0;
 769         *address = 0;
 770
 771         if (!acpi_tables_addr)
 772                 return AE_OK;
 773
 774         do {
 775                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 776                         WARN_ON(1);
 777                         return AE_OK;
 778                 }
 779
 780                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 781                                            ACPI_HEADER_SIZE);
 782
 783                 if (table_offset + table->length > all_tables_size) {
 784                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 785                         WARN_ON(1);
 786                         return AE_OK;
 787                 }
 788
 789                 table_offset += table->length;
 790
 791                 if (memcmp(existing_table->signature, table->signature, 4)) {
 792                         acpi_os_unmap_memory(table,
 793                                      ACPI_HEADER_SIZE);
 794                         continue;
 795                 }
 796
 797                 /* Only override tables with matching oem id */
 798                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 799                            ACPI_OEM_TABLE_ID_SIZE)) {
 800                         acpi_os_unmap_memory(table,
 801                                      ACPI_HEADER_SIZE);
 802                         continue;
 803                 }
 804
 805                 table_offset -= table->length;
 806                 *table_length = table->length;
 807                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 808                 *address = acpi_tables_addr + table_offset;
 809                 break;
 810         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 811
 812         if (*address != 0)
 813                 acpi_table_taint(existing_table);
 814         return AE_OK;
 815 #endif
 816 }
 817
 818 static irqreturn_t acpi_irq(int irq, void *dev_id)
 819 {
 820         u32 handled;
 821
 822         handled = (*acpi_irq_handler) (acpi_irq_context);
 823
 824         if (handled) {
 825                 acpi_irq_handled++;
 826                 return IRQ_HANDLED;
 827         } else {
 828                 acpi_irq_not_handled++;
 829                 return IRQ_NONE;
 830         }
 831 }
 832
 833 acpi_status
 834 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 835                                   void *context)
 836 {
 837         unsigned int irq;
 838
 839         acpi_irq_stats_init();
 840
 841         /*
 842          * ACPI interrupts different from the SCI in our copy of the FADT are
 843          * not supported.
 844          */
 845         if (gsi != acpi_gbl_FADT.sci_interrupt)
 846                 return AE_BAD_PARAMETER;
 847
 848         if (acpi_irq_handler)
 849                 return AE_ALREADY_ACQUIRED;
 850
 851         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 852                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 853                        gsi);
 854                 return AE_OK;
 855         }
 856
 857         acpi_irq_handler = handler;
 858         acpi_irq_context = context;
 859         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 860                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 861                 acpi_irq_handler = NULL;
 862                 return AE_NOT_ACQUIRED;
 863         }
 864         acpi_sci_irq = irq;
 865
 866         return AE_OK;
 867 }
 868
 869 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 870 {
 871         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 872                 return AE_BAD_PARAMETER;
 873
 874         free_irq(acpi_sci_irq, acpi_irq);
 875         acpi_irq_handler = NULL;
 876         acpi_sci_irq = INVALID_ACPI_IRQ;
 877
 878         return AE_OK;
 879 }
 880
 881 /*
 882  * Running in interpreter thread context, safe to sleep
 883  */
 884
 885 void acpi_os_sleep(u64 ms)
 886 {
 887         msleep(ms);
 888 }
 889
 890 void acpi_os_stall(u32 us)
 891 {
 892         while (us) {
 893                 u32 delay = 1000;
 894
 895                 if (delay > us)
 896                         delay = us;
 897                 udelay(delay);
 898                 touch_nmi_watchdog();
 899                 us -= delay;
 900         }
 901 }
 902
 903 /*
 904  * Support ACPI 3.0 AML Timer operand
 905  * Returns 64-bit free-running, monotonically increasing timer
 906  * with 100ns granularity
 907  */
 908 u64 acpi_os_get_timer(void)
 909 {
 910         u64 time_ns = ktime_to_ns(ktime_get());
 911         do_div(time_ns, 100);
 912         return time_ns;
 913 }
 914
 915 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 916 {
 917         u32 dummy;
 918
 919         if (!value)
 920                 value = &dummy;
 921
 922         *value = 0;
 923         if (width <= 8) {
 924                 *(u8 *) value = inb(port);
 925         } else if (width <= 16) {
 926                 *(u16 *) value = inw(port);
 927         } else if (width <= 32) {
 928                 *(u32 *) value = inl(port);
 929         } else {
 930                 BUG();
 931         }
 932
 933         return AE_OK;
 934 }
 935
 936 EXPORT_SYMBOL(acpi_os_read_port);
 937
 938 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 939 {
 940         if (width <= 8) {
 941                 outb(value, port);
 942         } else if (width <= 16) {
 943                 outw(value, port);
 944         } else if (width <= 32) {
 945                 outl(value, port);
 946         } else {
 947                 BUG();
 948         }
 949
 950         return AE_OK;
 951 }
 952
 953 EXPORT_SYMBOL(acpi_os_write_port);
 954
 955 acpi_status
 956 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 957 {
 958         void __iomem *virt_addr;
 959         unsigned int size = width / 8;
 960         bool unmap = false;
 961         u64 dummy;
 962
 963         rcu_read_lock();
 964         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 965         if (!virt_addr) {
 966                 rcu_read_unlock();
 967                 virt_addr = acpi_os_ioremap(phys_addr, size);
 968                 if (!virt_addr)
 969                         return AE_BAD_ADDRESS;
 970                 unmap = true;
 971         }
 972
 973         if (!value)
 974                 value = &dummy;
 975
 976         switch (width) {
 977         case 8:
 978                 *(u8 *) value = readb(virt_addr);
 979                 break;
 980         case 16:
 981                 *(u16 *) value = readw(virt_addr);
 982                 break;
 983         case 32:
 984                 *(u32 *) value = readl(virt_addr);
 985                 break;
 986         case 64:
 987                 *(u64 *) value = readq(virt_addr);
 988                 break;
 989         default:
 990                 BUG();
 991         }
 992
 993         if (unmap)
 994                 iounmap(virt_addr);
 995         else
 996                 rcu_read_unlock();
 997
 998         return AE_OK;
 999 }
1000
1001 acpi_status
1002 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1003 {
1004         void __iomem *virt_addr;
1005         unsigned int size = width / 8;
1006         bool unmap = false;
1007
1008         rcu_read_lock();
1009         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1010         if (!virt_addr) {
1011                 rcu_read_unlock();
1012                 virt_addr = acpi_os_ioremap(phys_addr, size);
1013                 if (!virt_addr)
1014                         return AE_BAD_ADDRESS;
1015                 unmap = true;
1016         }
1017
1018         switch (width) {
1019         case 8:
1020                 writeb(value, virt_addr);
1021                 break;
1022         case 16:
1023                 writew(value, virt_addr);
1024                 break;
1025         case 32:
1026                 writel(value, virt_addr);
1027                 break;
1028         case 64:
1029                 writeq(value, virt_addr);
1030                 break;
1031         default:
1032                 BUG();
1033         }
1034
1035         if (unmap)
1036                 iounmap(virt_addr);
1037         else
1038                 rcu_read_unlock();
1039
1040         return AE_OK;
1041 }
1042
1043 acpi_status
1044 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1045                                u64 *value, u32 width)
1046 {
1047         int result, size;
1048         u32 value32;
1049
1050         if (!value)
1051                 return AE_BAD_PARAMETER;
1052
1053         switch (width) {
1054         case 8:
1055                 size = 1;
1056                 break;
1057         case 16:
1058                 size = 2;
1059                 break;
1060         case 32:
1061                 size = 4;
1062                 break;
1063         default:
1064                 return AE_ERROR;
1065         }
1066
1067         result = raw_pci_read(pci_id->segment, pci_id->bus,
1068                                 PCI_DEVFN(pci_id->device, pci_id->function),
1069                                 reg, size, &value32);
1070         *value = value32;
1071
1072         return (result ? AE_ERROR : AE_OK);
1073 }
1074
1075 acpi_status
1076 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1077                                 u64 value, u32 width)
1078 {
1079         int result, size;
1080
1081         switch (width) {
1082         case 8:
1083                 size = 1;
1084                 break;
1085         case 16:
1086                 size = 2;
1087                 break;
1088         case 32:
1089                 size = 4;
1090                 break;
1091         default:
1092                 return AE_ERROR;
1093         }
1094
1095         result = raw_pci_write(pci_id->segment, pci_id->bus,
1096                                 PCI_DEVFN(pci_id->device, pci_id->function),
1097                                 reg, size, value);
1098
1099         return (result ? AE_ERROR : AE_OK);
1100 }
1101
1102 static void acpi_os_execute_deferred(struct work_struct *work)
1103 {
1104         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1105
1106         dpc->function(dpc->context);
1107         kfree(dpc);
1108 }
1109
1110 /*******************************************************************************
1111  *
1112  * FUNCTION:    acpi_os_execute
1113  *
1114  * PARAMETERS:  Type               - Type of the callback
1115  *              Function           - Function to be executed
1116  *              Context            - Function parameters
1117  *
1118  * RETURN:      Status
1119  *
1120  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1121  *              immediately executes function on a separate thread.
1122  *
1123  ******************************************************************************/
1124
1125 acpi_status acpi_os_execute(acpi_execute_type type,
1126                             acpi_osd_exec_callback function, void *context)
1127 {
1128         acpi_status status = AE_OK;
1129         struct acpi_os_dpc *dpc;
1130         struct workqueue_struct *queue;
1131         int ret;
1132         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1133                           "Scheduling function [%p(%p)] for deferred execution.\n",
1134                           function, context));
1135
1136         /*
1137          * Allocate/initialize DPC structure.  Note that this memory will be
1138          * freed by the callee.  The kernel handles the work_struct list  in a
1139          * way that allows us to also free its memory inside the callee.
1140          * Because we may want to schedule several tasks with different
1141          * parameters we can't use the approach some kernel code uses of
1142          * having a static work_struct.
1143          */
1144
1145         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1146         if (!dpc)
1147                 return AE_NO_MEMORY;
1148
1149         dpc->function = function;
1150         dpc->context = context;
1151
1152         /*
1153          * To prevent lockdep from complaining unnecessarily, make sure that
1154          * there is a different static lockdep key for each workqueue by using
1155          * INIT_WORK() for each of them separately.
1156          */
1157         if (type == OSL_NOTIFY_HANDLER) {
1158                 queue = kacpi_notify_wq;
1159                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1160         } else {
1161                 queue = kacpid_wq;
1162                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1163         }
1164
1165         /*
1166          * On some machines, a software-initiated SMI causes corruption unless
1167          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1168          * typically it's done in GPE-related methods that are run via
1169          * workqueues, so we can avoid the known corruption cases by always
1170          * queueing on CPU 0.
1171          */
1172         ret = queue_work_on(0, queue, &dpc->work);
1173
1174         if (!ret) {
1175                 printk(KERN_ERR PREFIX
1176                           "Call to queue_work() failed.\n");
1177                 status = AE_ERROR;
1178                 kfree(dpc);
1179         }
1180         return status;
1181 }
1182 EXPORT_SYMBOL(acpi_os_execute);
1183
1184 void acpi_os_wait_events_complete(void)
1185 {
1186         /*
1187          * Make sure the GPE handler or the fixed event handler is not used
1188          * on another CPU after removal.
1189          */
1190         if (acpi_sci_irq_valid())
1191                 synchronize_hardirq(acpi_sci_irq);
1192         flush_workqueue(kacpid_wq);
1193         flush_workqueue(kacpi_notify_wq);
1194 }
1195 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1196
1197 struct acpi_hp_work {
1198         struct work_struct work;
1199         struct acpi_device *adev;
1200         u32 src;
1201 };
1202
1203 static void acpi_hotplug_work_fn(struct work_struct *work)
1204 {
1205         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1206
1207         acpi_os_wait_events_complete();
1208         acpi_device_hotplug(hpw->adev, hpw->src);
1209         kfree(hpw);
1210 }
1211
1212 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1213 {
1214         struct acpi_hp_work *hpw;
1215
1216         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1217                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1218                   adev, src));
1219
1220         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1221         if (!hpw)
1222                 return AE_NO_MEMORY;
1223
1224         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1225         hpw->adev = adev;
1226         hpw->src = src;
1227         /*
1228          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1229          * the hotplug code may call driver .remove() functions, which may
1230          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1231          * these workqueues.
1232          */
1233         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1234                 kfree(hpw);
1235                 return AE_ERROR;
1236         }
1237         return AE_OK;
1238 }
1239
1240 bool acpi_queue_hotplug_work(struct work_struct *work)
1241 {
1242         return queue_work(kacpi_hotplug_wq, work);
1243 }
1244
1245 acpi_status
1246 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1247 {
1248         struct semaphore *sem = NULL;
1249
1250         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1251         if (!sem)
1252                 return AE_NO_MEMORY;
1253
1254         sema_init(sem, initial_units);
1255
1256         *handle = (acpi_handle *) sem;
1257
1258         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1259                           *handle, initial_units));
1260
1261         return AE_OK;
1262 }
1263
1264 /*
1265  * TODO: A better way to delete semaphores?  Linux doesn't have a
1266  * 'delete_semaphore()' function -- may result in an invalid
1267  * pointer dereference for non-synchronized consumers.  Should
1268  * we at least check for blocked threads and signal/cancel them?
1269  */
1270
1271 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1272 {
1273         struct semaphore *sem = (struct semaphore *)handle;
1274
1275         if (!sem)
1276                 return AE_BAD_PARAMETER;
1277
1278         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1279
1280         BUG_ON(!list_empty(&sem->wait_list));
1281         kfree(sem);
1282         sem = NULL;
1283
1284         return AE_OK;
1285 }
1286
1287 /*
1288  * TODO: Support for units > 1?
1289  */
1290 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1291 {
1292         acpi_status status = AE_OK;
1293         struct semaphore *sem = (struct semaphore *)handle;
1294         long jiffies;
1295         int ret = 0;
1296
1297         if (!acpi_os_initialized)
1298                 return AE_OK;
1299
1300         if (!sem || (units < 1))
1301                 return AE_BAD_PARAMETER;
1302
1303         if (units > 1)
1304                 return AE_SUPPORT;
1305
1306         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1307                           handle, units, timeout));
1308
1309         if (timeout == ACPI_WAIT_FOREVER)
1310                 jiffies = MAX_SCHEDULE_TIMEOUT;
1311         else
1312                 jiffies = msecs_to_jiffies(timeout);
1313
1314         ret = down_timeout(sem, jiffies);
1315         if (ret)
1316                 status = AE_TIME;
1317
1318         if (ACPI_FAILURE(status)) {
1319                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1320                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1321                                   handle, units, timeout,
1322                                   acpi_format_exception(status)));
1323         } else {
1324                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1325                                   "Acquired semaphore[%p|%d|%d]", handle,
1326                                   units, timeout));
1327         }
1328
1329         return status;
1330 }
1331
1332 /*
1333  * TODO: Support for units > 1?
1334  */
1335 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1336 {
1337         struct semaphore *sem = (struct semaphore *)handle;
1338
1339         if (!acpi_os_initialized)
1340                 return AE_OK;
1341
1342         if (!sem || (units < 1))
1343                 return AE_BAD_PARAMETER;
1344
1345         if (units > 1)
1346                 return AE_SUPPORT;
1347
1348         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1349                           units));
1350
1351         up(sem);
1352
1353         return AE_OK;
1354 }
1355
1356 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1357 {
1358 #ifdef ENABLE_DEBUGGER
1359         if (acpi_in_debugger) {
1360                 u32 chars;
1361
1362                 kdb_read(buffer, buffer_length);
1363
1364                 /* remove the CR kdb includes */
1365                 chars = strlen(buffer) - 1;
1366                 buffer[chars] = '\0';
1367         }
1368 #endif
1369
1370         return AE_OK;
1371 }
1372
1373 acpi_status acpi_os_signal(u32 function, void *info)
1374 {
1375         switch (function) {
1376         case ACPI_SIGNAL_FATAL:
1377                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1378                 break;
1379         case ACPI_SIGNAL_BREAKPOINT:
1380                 /*
1381                  * AML Breakpoint
1382                  * ACPI spec. says to treat it as a NOP unless
1383                  * you are debugging.  So if/when we integrate
1384                  * AML debugger into the kernel debugger its
1385                  * hook will go here.  But until then it is
1386                  * not useful to print anything on breakpoints.
1387                  */
1388                 break;
1389         default:
1390                 break;
1391         }
1392
1393         return AE_OK;
1394 }
1395
1396 static int __init acpi_os_name_setup(char *str)
1397 {
1398         char *p = acpi_os_name;
1399         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1400
1401         if (!str || !*str)
1402                 return 0;
1403
1404         for (; count-- && *str; str++) {
1405                 if (isalnum(*str) || *str == ' ' || *str == ':')
1406                         *p++ = *str;
1407                 else if (*str == '\'' || *str == '"')
1408                         continue;
1409                 else
1410                         break;
1411         }
1412         *p = 0;
1413
1414         return 1;
1415
1416 }
1417
1418 __setup("acpi_os_name=", acpi_os_name_setup);
1419
1420 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1421 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1422
1423 struct osi_setup_entry {
1424         char string[OSI_STRING_LENGTH_MAX];
1425         bool enable;
1426 };
1427
1428 static struct osi_setup_entry
1429                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1430         {"Module Device", true},
1431         {"Processor Device", true},
1432         {"3.0 _SCP Extensions", true},
1433         {"Processor Aggregator Device", true},
1434 };
1435
1436 void __init acpi_osi_setup(char *str)
1437 {
1438         struct osi_setup_entry *osi;
1439         bool enable = true;
1440         int i;
1441
1442         if (!acpi_gbl_create_osi_method)
1443                 return;
1444
1445         if (str == NULL || *str == '\0') {
1446                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1447                 acpi_gbl_create_osi_method = FALSE;
1448                 return;
1449         }
1450
1451         if (*str == '!') {
1452                 str++;
1453                 if (*str == '\0') {
1454                         /* Do not override acpi_osi=!* */
1455                         if (!osi_linux.default_disabling)
1456                                 osi_linux.default_disabling =
1457                                         ACPI_DISABLE_ALL_VENDOR_STRINGS;
1458                         return;
1459                 } else if (*str == '*') {
1460                         osi_linux.default_disabling = ACPI_DISABLE_ALL_STRINGS;
1461                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1462                                 osi = &osi_setup_entries[i];
1463                                 osi->enable = false;
1464                         }
1465                         return;
1466                 }
1467                 enable = false;
1468         }
1469
1470         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1471                 osi = &osi_setup_entries[i];
1472                 if (!strcmp(osi->string, str)) {
1473                         osi->enable = enable;
1474                         break;
1475                 } else if (osi->string[0] == '\0') {
1476                         osi->enable = enable;
1477                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1478                         break;
1479                 }
1480         }
1481 }
1482
1483 static void __init set_osi_linux(unsigned int enable)
1484 {
1485         if (osi_linux.enable != enable)
1486                 osi_linux.enable = enable;
1487
1488         if (osi_linux.enable)
1489                 acpi_osi_setup("Linux");
1490         else
1491                 acpi_osi_setup("!Linux");
1492
1493         return;
1494 }
1495
1496 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1497 {
1498         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1499         osi_linux.dmi = 0;
1500         set_osi_linux(enable);
1501
1502         return;
1503 }
1504
1505 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1506 {
1507         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1508
1509         if (enable == -1)
1510                 return;
1511
1512         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1513         set_osi_linux(enable);
1514
1515         return;
1516 }
1517
1518 /*
1519  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1520  *
1521  * empty string disables _OSI
1522  * string starting with '!' disables that string
1523  * otherwise string is added to list, augmenting built-in strings
1524  */
1525 static void __init acpi_osi_setup_late(void)
1526 {
1527         struct osi_setup_entry *osi;
1528         char *str;
1529         int i;
1530         acpi_status status;
1531
1532         if (osi_linux.default_disabling) {
1533                 status = acpi_update_interfaces(osi_linux.default_disabling);
1534
1535                 if (ACPI_SUCCESS(status))
1536                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors%s\n",
1537                                 osi_linux.default_disabling ==
1538                                 ACPI_DISABLE_ALL_STRINGS ?
1539                                 " and feature groups" : "");
1540         }
1541
1542         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1543                 osi = &osi_setup_entries[i];
1544                 str = osi->string;
1545
1546                 if (*str == '\0')
1547                         break;
1548                 if (osi->enable) {
1549                         status = acpi_install_interface(str);
1550
1551                         if (ACPI_SUCCESS(status))
1552                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1553                 } else {
1554                         status = acpi_remove_interface(str);
1555
1556                         if (ACPI_SUCCESS(status))
1557                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1558                 }
1559         }
1560 }
1561
1562 static int __init osi_setup(char *str)
1563 {
1564         if (str && !strcmp("Linux", str))
1565                 acpi_cmdline_osi_linux(1);
1566         else if (str && !strcmp("!Linux", str))
1567                 acpi_cmdline_osi_linux(0);
1568         else
1569                 acpi_osi_setup(str);
1570
1571         return 1;
1572 }
1573
1574 __setup("acpi_osi=", osi_setup);
1575
1576 /*
1577  * Disable the auto-serialization of named objects creation methods.
1578  *
1579  * This feature is enabled by default.  It marks the AML control methods
1580  * that contain the opcodes to create named objects as "Serialized".
1581  */
1582 static int __init acpi_no_auto_serialize_setup(char *str)
1583 {
1584         acpi_gbl_auto_serialize_methods = FALSE;
1585         pr_info("ACPI: auto-serialization disabled\n");
1586
1587         return 1;
1588 }
1589
1590 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1591
1592 /* Check of resource interference between native drivers and ACPI
1593  * OperationRegions (SystemIO and System Memory only).
1594  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1595  * in arbitrary AML code and can interfere with legacy drivers.
1596  * acpi_enforce_resources= can be set to:
1597  *
1598  *   - strict (default) (2)
1599  *     -> further driver trying to access the resources will not load
1600  *   - lax              (1)
1601  *     -> further driver trying to access the resources will load, but you
1602  *     get a system message that something might go wrong...
1603  *
1604  *   - no               (0)
1605  *     -> ACPI Operation Region resources will not be registered
1606  *
1607  */
1608 #define ENFORCE_RESOURCES_STRICT 2
1609 #define ENFORCE_RESOURCES_LAX    1
1610 #define ENFORCE_RESOURCES_NO     0
1611
1612 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1613
1614 static int __init acpi_enforce_resources_setup(char *str)
1615 {
1616         if (str == NULL || *str == '\0')
1617                 return 0;
1618
1619         if (!strcmp("strict", str))
1620                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1621         else if (!strcmp("lax", str))
1622                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1623         else if (!strcmp("no", str))
1624                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1625
1626         return 1;
1627 }
1628
1629 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1630
1631 /* Check for resource conflicts between ACPI OperationRegions and native
1632  * drivers */
1633 int acpi_check_resource_conflict(const struct resource *res)
1634 {
1635         acpi_adr_space_type space_id;
1636         acpi_size length;
1637         u8 warn = 0;
1638         int clash = 0;
1639
1640         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1641                 return 0;
1642         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1643                 return 0;
1644
1645         if (res->flags & IORESOURCE_IO)
1646                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1647         else
1648                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1649
1650         length = resource_size(res);
1651         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1652                 warn = 1;
1653         clash = acpi_check_address_range(space_id, res->start, length, warn);
1654
1655         if (clash) {
1656                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1657                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1658                                 printk(KERN_NOTICE "ACPI: This conflict may"
1659                                        " cause random problems and system"
1660                                        " instability\n");
1661                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1662                                " for this device, you should use it instead of"
1663                                " the native driver\n");
1664                 }
1665                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1666                         return -EBUSY;
1667         }
1668         return 0;
1669 }
1670 EXPORT_SYMBOL(acpi_check_resource_conflict);
1671
1672 int acpi_check_region(resource_size_t start, resource_size_t n,
1673                       const char *name)
1674 {
1675         struct resource res = {
1676                 .start = start,
1677                 .end   = start + n - 1,
1678                 .name  = name,
1679                 .flags = IORESOURCE_IO,
1680         };
1681
1682         return acpi_check_resource_conflict(&res);
1683 }
1684 EXPORT_SYMBOL(acpi_check_region);
1685
1686 /*
1687  * Let drivers know whether the resource checks are effective
1688  */
1689 int acpi_resources_are_enforced(void)
1690 {
1691         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1692 }
1693 EXPORT_SYMBOL(acpi_resources_are_enforced);
1694
1695 bool acpi_osi_is_win8(void)
1696 {
1697         return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
1698 }
1699 EXPORT_SYMBOL(acpi_osi_is_win8);
1700
1701 /*
1702  * Deallocate the memory for a spinlock.
1703  */
1704 void acpi_os_delete_lock(acpi_spinlock handle)
1705 {
1706         ACPI_FREE(handle);
1707 }
1708
1709 /*
1710  * Acquire a spinlock.
1711  *
1712  * handle is a pointer to the spinlock_t.
1713  */
1714
1715 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1716 {
1717         acpi_cpu_flags flags;
1718         spin_lock_irqsave(lockp, flags);
1719         return flags;
1720 }
1721
1722 /*
1723  * Release a spinlock. See above.
1724  */
1725
1726 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1727 {
1728         spin_unlock_irqrestore(lockp, flags);
1729 }
1730
1731 #ifndef ACPI_USE_LOCAL_CACHE
1732
1733 /*******************************************************************************
1734  *
1735  * FUNCTION:    acpi_os_create_cache
1736  *
1737  * PARAMETERS:  name      - Ascii name for the cache
1738  *              size      - Size of each cached object
1739  *              depth     - Maximum depth of the cache (in objects) <ignored>
1740  *              cache     - Where the new cache object is returned
1741  *
1742  * RETURN:      status
1743  *
1744  * DESCRIPTION: Create a cache object
1745  *
1746  ******************************************************************************/
1747
1748 acpi_status
1749 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1750 {
1751         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1752         if (*cache == NULL)
1753                 return AE_ERROR;
1754         else
1755                 return AE_OK;
1756 }
1757
1758 /*******************************************************************************
1759  *
1760  * FUNCTION:    acpi_os_purge_cache
1761  *
1762  * PARAMETERS:  Cache           - Handle to cache object
1763  *
1764  * RETURN:      Status
1765  *
1766  * DESCRIPTION: Free all objects within the requested cache.
1767  *
1768  ******************************************************************************/
1769
1770 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1771 {
1772         kmem_cache_shrink(cache);
1773         return (AE_OK);
1774 }
1775
1776 /*******************************************************************************
1777  *
1778  * FUNCTION:    acpi_os_delete_cache
1779  *
1780  * PARAMETERS:  Cache           - Handle to cache object
1781  *
1782  * RETURN:      Status
1783  *
1784  * DESCRIPTION: Free all objects within the requested cache and delete the
1785  *              cache object.
1786  *
1787  ******************************************************************************/
1788
1789 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1790 {
1791         kmem_cache_destroy(cache);
1792         return (AE_OK);
1793 }
1794
1795 /*******************************************************************************
1796  *
1797  * FUNCTION:    acpi_os_release_object
1798  *
1799  * PARAMETERS:  Cache       - Handle to cache object
1800  *              Object      - The object to be released
1801  *
1802  * RETURN:      None
1803  *
1804  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1805  *              the object is deleted.
1806  *
1807  ******************************************************************************/
1808
1809 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1810 {
1811         kmem_cache_free(cache, object);
1812         return (AE_OK);
1813 }
1814 #endif
1815
1816 static int __init acpi_no_static_ssdt_setup(char *s)
1817 {
1818         acpi_gbl_disable_ssdt_table_install = TRUE;
1819         pr_info("ACPI: static SSDT installation disabled\n");
1820
1821         return 0;
1822 }
1823
1824 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1825
1826 static int __init acpi_disable_return_repair(char *s)
1827 {
1828         printk(KERN_NOTICE PREFIX
1829                "ACPI: Predefined validation mechanism disabled\n");
1830         acpi_gbl_disable_auto_repair = TRUE;
1831
1832         return 1;
1833 }
1834
1835 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1836
1837 acpi_status __init acpi_os_initialize(void)
1838 {
1839         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1840         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1841         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1842         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1843         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1844                 /*
1845                  * Use acpi_os_map_generic_address to pre-map the reset
1846                  * register if it's in system memory.
1847                  */
1848                 int rv;
1849
1850                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1851                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1852         }
1853         acpi_os_initialized = true;
1854
1855         return AE_OK;
1856 }
1857
1858 acpi_status __init acpi_os_initialize1(void)
1859 {
1860         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1861         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1862         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1863         BUG_ON(!kacpid_wq);
1864         BUG_ON(!kacpi_notify_wq);
1865         BUG_ON(!kacpi_hotplug_wq);
1866         acpi_install_interface_handler(acpi_osi_handler);
1867         acpi_osi_setup_late();
1868         return AE_OK;
1869 }
1870
1871 acpi_status acpi_os_terminate(void)
1872 {
1873         if (acpi_irq_handler) {
1874                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1875                                                  acpi_irq_handler);
1876         }
1877
1878         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1879         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1880         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1881         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1882         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1883                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1884
1885         destroy_workqueue(kacpid_wq);
1886         destroy_workqueue(kacpi_notify_wq);
1887         destroy_workqueue(kacpi_hotplug_wq);
1888
1889         return AE_OK;
1890 }
1891
1892 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1893                                   u32 pm1b_control)
1894 {
1895         int rc = 0;
1896         if (__acpi_os_prepare_sleep)
1897                 rc = __acpi_os_prepare_sleep(sleep_state,
1898                                              pm1a_control, pm1b_control);
1899         if (rc < 0)
1900                 return AE_ERROR;
1901         else if (rc > 0)
1902                 return AE_CTRL_SKIP;
1903
1904         return AE_OK;
1905 }
1906
1907 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1908                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1909 {
1910         __acpi_os_prepare_sleep = func;
1911 }
1912
1913 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1914                                   u32 val_b)
1915 {
1916         int rc = 0;
1917         if (__acpi_os_prepare_extended_sleep)
1918                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1919                                              val_a, val_b);
1920         if (rc < 0)
1921                 return AE_ERROR;
1922         else if (rc > 0)
1923                 return AE_CTRL_SKIP;
1924
1925         return AE_OK;
1926 }
1927
1928 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1929                                u32 val_a, u32 val_b))
1930 {
1931         __acpi_os_prepare_extended_sleep = func;
1932 }