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  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/pci.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/kmod.h>
  37 #include <linux/delay.h>
  38 #include <linux/workqueue.h>
  39 #include <linux/nmi.h>
  40 #include <linux/acpi.h>
  41 #include <linux/efi.h>
  42 #include <linux/ioport.h>
  43 #include <linux/list.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/semaphore.h>
  46
  47 #include <asm/io.h>
  48 #include <asm/uaccess.h>
  49
  50 #include <acpi/acpi.h>
  51 #include <acpi/acpi_bus.h>
  52 #include <acpi/processor.h>
  53
  54 #define _COMPONENT              ACPI_OS_SERVICES
  55 ACPI_MODULE_NAME("osl");
  56 #define PREFIX          "ACPI: "
  57 struct acpi_os_dpc {
  58         acpi_osd_exec_callback function;
  59         void *context;
  60         struct work_struct work;
  61         int wait;
  62 };
  63
  64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  66 #endif
  67
  68 #ifdef ENABLE_DEBUGGER
  69 #include <linux/kdb.h>
  70
  71 /* stuff for debugger support */
  72 int acpi_in_debugger;
  73 EXPORT_SYMBOL(acpi_in_debugger);
  74
  75 extern char line_buf[80];
  76 #endif                          /*ENABLE_DEBUGGER */
  77
  78 static unsigned int acpi_irq_irq;
  79 static acpi_osd_handler acpi_irq_handler;
  80 static void *acpi_irq_context;
  81 static struct workqueue_struct *kacpid_wq;
  82 static struct workqueue_struct *kacpi_notify_wq;
  83 static struct workqueue_struct *kacpi_hotplug_wq;
  84
  85 struct acpi_res_list {
  86         resource_size_t start;
  87         resource_size_t end;
  88         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  89         char name[5];   /* only can have a length of 4 chars, make use of this
  90                            one instead of res->name, no need to kalloc then */
  91         struct list_head resource_list;
  92         int count;
  93 };
  94
  95 static LIST_HEAD(resource_list_head);
  96 static DEFINE_SPINLOCK(acpi_res_lock);
  97
  98 /*
  99  * This list of permanent mappings is for memory that may be accessed from
 100  * interrupt context, where we can't do the ioremap().
 101  */
 102 struct acpi_ioremap {
 103         struct list_head list;
 104         void __iomem *virt;
 105         acpi_physical_address phys;
 106         acpi_size size;
 107         struct kref ref;
 108 };
 109
 110 static LIST_HEAD(acpi_ioremaps);
 111 static DEFINE_SPINLOCK(acpi_ioremap_lock);
 112
 113 static void __init acpi_osi_setup_late(void);
 114
 115 /*
 116  * The story of _OSI(Linux)
 117  *
 118  * From pre-history through Linux-2.6.22,
 119  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 120  *
 121  * Unfortunately, reference BIOS writers got wind of this
 122  * and put OSI(Linux) in their example code, quickly exposing
 123  * this string as ill-conceived and opening the door to
 124  * an un-bounded number of BIOS incompatibilities.
 125  *
 126  * For example, OSI(Linux) was used on resume to re-POST a
 127  * video card on one system, because Linux at that time
 128  * could not do a speedy restore in its native driver.
 129  * But then upon gaining quick native restore capability,
 130  * Linux has no way to tell the BIOS to skip the time-consuming
 131  * POST -- putting Linux at a permanent performance disadvantage.
 132  * On another system, the BIOS writer used OSI(Linux)
 133  * to infer native OS support for IPMI!  On other systems,
 134  * OSI(Linux) simply got in the way of Linux claiming to
 135  * be compatible with other operating systems, exposing
 136  * BIOS issues such as skipped device initialization.
 137  *
 138  * So "Linux" turned out to be a really poor chose of
 139  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 140  *
 141  * BIOS writers should NOT query _OSI(Linux) on future systems.
 142  * Linux will complain on the console when it sees it, and return FALSE.
 143  * To get Linux to return TRUE for your system  will require
 144  * a kernel source update to add a DMI entry,
 145  * or boot with "acpi_osi=Linux"
 146  */
 147
 148 static struct osi_linux {
 149         unsigned int    enable:1;
 150         unsigned int    dmi:1;
 151         unsigned int    cmdline:1;
 152 } osi_linux = {0, 0, 0};
 153
 154 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 155 {
 156         if (!strcmp("Linux", interface)) {
 157
 158                 printk(KERN_NOTICE FW_BUG PREFIX
 159                         "BIOS _OSI(Linux) query %s%s\n",
 160                         osi_linux.enable ? "honored" : "ignored",
 161                         osi_linux.cmdline ? " via cmdline" :
 162                         osi_linux.dmi ? " via DMI" : "");
 163         }
 164
 165         return supported;
 166 }
 167
 168 static void __init acpi_request_region (struct acpi_generic_address *addr,
 169         unsigned int length, char *desc)
 170 {
 171         if (!addr->address || !length)
 172                 return;
 173
 174         /* Resources are never freed */
 175         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 176                 request_region(addr->address, length, desc);
 177         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 178                 request_mem_region(addr->address, length, desc);
 179 }
 180
 181 static int __init acpi_reserve_resources(void)
 182 {
 183         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 184                 "ACPI PM1a_EVT_BLK");
 185
 186         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 187                 "ACPI PM1b_EVT_BLK");
 188
 189         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 190                 "ACPI PM1a_CNT_BLK");
 191
 192         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 193                 "ACPI PM1b_CNT_BLK");
 194
 195         if (acpi_gbl_FADT.pm_timer_length == 4)
 196                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 197
 198         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 199                 "ACPI PM2_CNT_BLK");
 200
 201         /* Length of GPE blocks must be a non-negative multiple of 2 */
 202
 203         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 204                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 205                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 206
 207         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 208                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 209                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 210
 211         return 0;
 212 }
 213 device_initcall(acpi_reserve_resources);
 214
 215 void acpi_os_printf(const char *fmt, ...)
 216 {
 217         va_list args;
 218         va_start(args, fmt);
 219         acpi_os_vprintf(fmt, args);
 220         va_end(args);
 221 }
 222
 223 void acpi_os_vprintf(const char *fmt, va_list args)
 224 {
 225         static char buffer[512];
 226
 227         vsprintf(buffer, fmt, args);
 228
 229 #ifdef ENABLE_DEBUGGER
 230         if (acpi_in_debugger) {
 231                 kdb_printf("%s", buffer);
 232         } else {
 233                 printk(KERN_CONT "%s", buffer);
 234         }
 235 #else
 236         printk(KERN_CONT "%s", buffer);
 237 #endif
 238 }
 239
 240 acpi_physical_address __init acpi_os_get_root_pointer(void)
 241 {
 242         if (efi_enabled) {
 243                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 244                         return efi.acpi20;
 245                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 246                         return efi.acpi;
 247                 else {
 248                         printk(KERN_ERR PREFIX
 249                                "System description tables not found\n");
 250                         return 0;
 251                 }
 252         } else {
 253                 acpi_physical_address pa = 0;
 254
 255                 acpi_find_root_pointer(&pa);
 256                 return pa;
 257         }
 258 }
 259
 260 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 261 static struct acpi_ioremap *
 262 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 263 {
 264         struct acpi_ioremap *map;
 265
 266         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 267                 if (map->phys <= phys &&
 268                     phys + size <= map->phys + map->size)
 269                         return map;
 270
 271         return NULL;
 272 }
 273
 274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 275 static void __iomem *
 276 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 277 {
 278         struct acpi_ioremap *map;
 279
 280         map = acpi_map_lookup(phys, size);
 281         if (map)
 282                 return map->virt + (phys - map->phys);
 283
 284         return NULL;
 285 }
 286
 287 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 288 static struct acpi_ioremap *
 289 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 290 {
 291         struct acpi_ioremap *map;
 292
 293         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 294                 if (map->virt <= virt &&
 295                     virt + size <= map->virt + map->size)
 296                         return map;
 297
 298         return NULL;
 299 }
 300
 301 void __iomem *__init_refok
 302 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 303 {
 304         struct acpi_ioremap *map, *tmp_map;
 305         unsigned long flags, pg_sz;
 306         void __iomem *virt;
 307         phys_addr_t pg_off;
 308
 309         if (phys > ULONG_MAX) {
 310                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 311                 return NULL;
 312         }
 313
 314         if (!acpi_gbl_permanent_mmap)
 315                 return __acpi_map_table((unsigned long)phys, size);
 316
 317         map = kzalloc(sizeof(*map), GFP_KERNEL);
 318         if (!map)
 319                 return NULL;
 320
 321         pg_off = round_down(phys, PAGE_SIZE);
 322         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 323         virt = ioremap_cache(pg_off, pg_sz);
 324         if (!virt) {
 325                 kfree(map);
 326                 return NULL;
 327         }
 328
 329         INIT_LIST_HEAD(&map->list);
 330         map->virt = virt;
 331         map->phys = pg_off;
 332         map->size = pg_sz;
 333         kref_init(&map->ref);
 334
 335         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 336         /* Check if page has already been mapped. */
 337         tmp_map = acpi_map_lookup(phys, size);
 338         if (tmp_map) {
 339                 kref_get(&tmp_map->ref);
 340                 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 341                 iounmap(map->virt);
 342                 kfree(map);
 343                 return tmp_map->virt + (phys - tmp_map->phys);
 344         }
 345         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 346         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 347
 348         return map->virt + (phys - map->phys);
 349 }
 350 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 351
 352 static void acpi_kref_del_iomap(struct kref *ref)
 353 {
 354         struct acpi_ioremap *map;
 355
 356         map = container_of(ref, struct acpi_ioremap, ref);
 357         list_del_rcu(&map->list);
 358 }
 359
 360 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 361 {
 362         struct acpi_ioremap *map;
 363         unsigned long flags;
 364         int del;
 365
 366         if (!acpi_gbl_permanent_mmap) {
 367                 __acpi_unmap_table(virt, size);
 368                 return;
 369         }
 370
 371         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 372         map = acpi_map_lookup_virt(virt, size);
 373         if (!map) {
 374                 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 375                 printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt);
 376                 dump_stack();
 377                 return;
 378         }
 379
 380         del = kref_put(&map->ref, acpi_kref_del_iomap);
 381         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 382
 383         if (!del)
 384                 return;
 385
 386         synchronize_rcu();
 387         iounmap(map->virt);
 388         kfree(map);
 389 }
 390 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 391
 392 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 393 {
 394         if (!acpi_gbl_permanent_mmap)
 395                 __acpi_unmap_table(virt, size);
 396 }
 397
 398 int acpi_os_map_generic_address(struct acpi_generic_address *addr)
 399 {
 400         void __iomem *virt;
 401
 402         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 403                 return 0;
 404
 405         if (!addr->address || !addr->bit_width)
 406                 return -EINVAL;
 407
 408         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
 409         if (!virt)
 410                 return -EIO;
 411
 412         return 0;
 413 }
 414 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address);
 415
 416 void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
 417 {
 418         void __iomem *virt;
 419         unsigned long flags;
 420         acpi_size size = addr->bit_width / 8;
 421
 422         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 423                 return;
 424
 425         if (!addr->address || !addr->bit_width)
 426                 return;
 427
 428         spin_lock_irqsave(&acpi_ioremap_lock, flags);
 429         virt = acpi_map_vaddr_lookup(addr->address, size);
 430         spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
 431
 432         acpi_os_unmap_memory(virt, size);
 433 }
 434 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address);
 435
 436 #ifdef ACPI_FUTURE_USAGE
 437 acpi_status
 438 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 439 {
 440         if (!phys || !virt)
 441                 return AE_BAD_PARAMETER;
 442
 443         *phys = virt_to_phys(virt);
 444
 445         return AE_OK;
 446 }
 447 #endif
 448
 449 #define ACPI_MAX_OVERRIDE_LEN 100
 450
 451 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 452
 453 acpi_status
 454 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 455                             acpi_string * new_val)
 456 {
 457         if (!init_val || !new_val)
 458                 return AE_BAD_PARAMETER;
 459
 460         *new_val = NULL;
 461         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 462                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 463                        acpi_os_name);
 464                 *new_val = acpi_os_name;
 465         }
 466
 467         return AE_OK;
 468 }
 469
 470 acpi_status
 471 acpi_os_table_override(struct acpi_table_header * existing_table,
 472                        struct acpi_table_header ** new_table)
 473 {
 474         if (!existing_table || !new_table)
 475                 return AE_BAD_PARAMETER;
 476
 477         *new_table = NULL;
 478
 479 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 480         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 481                 *new_table = (struct acpi_table_header *)AmlCode;
 482 #endif
 483         if (*new_table != NULL) {
 484                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 485                            "this is unsafe: tainting kernel\n",
 486                        existing_table->signature,
 487                        existing_table->oem_table_id);
 488                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 489         }
 490         return AE_OK;
 491 }
 492
 493 static irqreturn_t acpi_irq(int irq, void *dev_id)
 494 {
 495         u32 handled;
 496
 497         handled = (*acpi_irq_handler) (acpi_irq_context);
 498
 499         if (handled) {
 500                 acpi_irq_handled++;
 501                 return IRQ_HANDLED;
 502         } else {
 503                 acpi_irq_not_handled++;
 504                 return IRQ_NONE;
 505         }
 506 }
 507
 508 acpi_status
 509 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 510                                   void *context)
 511 {
 512         unsigned int irq;
 513
 514         acpi_irq_stats_init();
 515
 516         /*
 517          * Ignore the GSI from the core, and use the value in our copy of the
 518          * FADT. It may not be the same if an interrupt source override exists
 519          * for the SCI.
 520          */
 521         gsi = acpi_gbl_FADT.sci_interrupt;
 522         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 523                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 524                        gsi);
 525                 return AE_OK;
 526         }
 527
 528         acpi_irq_handler = handler;
 529         acpi_irq_context = context;
 530         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 531                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 532                 return AE_NOT_ACQUIRED;
 533         }
 534         acpi_irq_irq = irq;
 535
 536         return AE_OK;
 537 }
 538
 539 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 540 {
 541         if (irq) {
 542                 free_irq(irq, acpi_irq);
 543                 acpi_irq_handler = NULL;
 544                 acpi_irq_irq = 0;
 545         }
 546
 547         return AE_OK;
 548 }
 549
 550 /*
 551  * Running in interpreter thread context, safe to sleep
 552  */
 553
 554 void acpi_os_sleep(u64 ms)
 555 {
 556         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 557 }
 558
 559 void acpi_os_stall(u32 us)
 560 {
 561         while (us) {
 562                 u32 delay = 1000;
 563
 564                 if (delay > us)
 565                         delay = us;
 566                 udelay(delay);
 567                 touch_nmi_watchdog();
 568                 us -= delay;
 569         }
 570 }
 571
 572 /*
 573  * Support ACPI 3.0 AML Timer operand
 574  * Returns 64-bit free-running, monotonically increasing timer
 575  * with 100ns granularity
 576  */
 577 u64 acpi_os_get_timer(void)
 578 {
 579         static u64 t;
 580
 581 #ifdef  CONFIG_HPET
 582         /* TBD: use HPET if available */
 583 #endif
 584
 585 #ifdef  CONFIG_X86_PM_TIMER
 586         /* TBD: default to PM timer if HPET was not available */
 587 #endif
 588         if (!t)
 589                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 590
 591         return ++t;
 592 }
 593
 594 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 595 {
 596         u32 dummy;
 597
 598         if (!value)
 599                 value = &dummy;
 600
 601         *value = 0;
 602         if (width <= 8) {
 603                 *(u8 *) value = inb(port);
 604         } else if (width <= 16) {
 605                 *(u16 *) value = inw(port);
 606         } else if (width <= 32) {
 607                 *(u32 *) value = inl(port);
 608         } else {
 609                 BUG();
 610         }
 611
 612         return AE_OK;
 613 }
 614
 615 EXPORT_SYMBOL(acpi_os_read_port);
 616
 617 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 618 {
 619         if (width <= 8) {
 620                 outb(value, port);
 621         } else if (width <= 16) {
 622                 outw(value, port);
 623         } else if (width <= 32) {
 624                 outl(value, port);
 625         } else {
 626                 BUG();
 627         }
 628
 629         return AE_OK;
 630 }
 631
 632 EXPORT_SYMBOL(acpi_os_write_port);
 633
 634 acpi_status
 635 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 636 {
 637         u32 dummy;
 638         void __iomem *virt_addr;
 639         int size = width / 8, unmap = 0;
 640
 641         rcu_read_lock();
 642         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 643         rcu_read_unlock();
 644         if (!virt_addr) {
 645                 virt_addr = ioremap_cache(phys_addr, size);
 646                 unmap = 1;
 647         }
 648         if (!value)
 649                 value = &dummy;
 650
 651         switch (width) {
 652         case 8:
 653                 *(u8 *) value = readb(virt_addr);
 654                 break;
 655         case 16:
 656                 *(u16 *) value = readw(virt_addr);
 657                 break;
 658         case 32:
 659                 *(u32 *) value = readl(virt_addr);
 660                 break;
 661         default:
 662                 BUG();
 663         }
 664
 665         if (unmap)
 666                 iounmap(virt_addr);
 667
 668         return AE_OK;
 669 }
 670
 671 acpi_status
 672 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 673 {
 674         void __iomem *virt_addr;
 675         int size = width / 8, unmap = 0;
 676
 677         rcu_read_lock();
 678         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 679         rcu_read_unlock();
 680         if (!virt_addr) {
 681                 virt_addr = ioremap_cache(phys_addr, size);
 682                 unmap = 1;
 683         }
 684
 685         switch (width) {
 686         case 8:
 687                 writeb(value, virt_addr);
 688                 break;
 689         case 16:
 690                 writew(value, virt_addr);
 691                 break;
 692         case 32:
 693                 writel(value, virt_addr);
 694                 break;
 695         default:
 696                 BUG();
 697         }
 698
 699         if (unmap)
 700                 iounmap(virt_addr);
 701
 702         return AE_OK;
 703 }
 704
 705 acpi_status
 706 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 707                                u64 *value, u32 width)
 708 {
 709         int result, size;
 710         u32 value32;
 711
 712         if (!value)
 713                 return AE_BAD_PARAMETER;
 714
 715         switch (width) {
 716         case 8:
 717                 size = 1;
 718                 break;
 719         case 16:
 720                 size = 2;
 721                 break;
 722         case 32:
 723                 size = 4;
 724                 break;
 725         default:
 726                 return AE_ERROR;
 727         }
 728
 729         result = raw_pci_read(pci_id->segment, pci_id->bus,
 730                                 PCI_DEVFN(pci_id->device, pci_id->function),
 731                                 reg, size, &value32);
 732         *value = value32;
 733
 734         return (result ? AE_ERROR : AE_OK);
 735 }
 736
 737 acpi_status
 738 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 739                                 u64 value, u32 width)
 740 {
 741         int result, size;
 742
 743         switch (width) {
 744         case 8:
 745                 size = 1;
 746                 break;
 747         case 16:
 748                 size = 2;
 749                 break;
 750         case 32:
 751                 size = 4;
 752                 break;
 753         default:
 754                 return AE_ERROR;
 755         }
 756
 757         result = raw_pci_write(pci_id->segment, pci_id->bus,
 758                                 PCI_DEVFN(pci_id->device, pci_id->function),
 759                                 reg, size, value);
 760
 761         return (result ? AE_ERROR : AE_OK);
 762 }
 763
 764 static void acpi_os_execute_deferred(struct work_struct *work)
 765 {
 766         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 767
 768         if (dpc->wait)
 769                 acpi_os_wait_events_complete(NULL);
 770
 771         dpc->function(dpc->context);
 772         kfree(dpc);
 773 }
 774
 775 /*******************************************************************************
 776  *
 777  * FUNCTION:    acpi_os_execute
 778  *
 779  * PARAMETERS:  Type               - Type of the callback
 780  *              Function           - Function to be executed
 781  *              Context            - Function parameters
 782  *
 783  * RETURN:      Status
 784  *
 785  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 786  *              immediately executes function on a separate thread.
 787  *
 788  ******************************************************************************/
 789
 790 static acpi_status __acpi_os_execute(acpi_execute_type type,
 791         acpi_osd_exec_callback function, void *context, int hp)
 792 {
 793         acpi_status status = AE_OK;
 794         struct acpi_os_dpc *dpc;
 795         struct workqueue_struct *queue;
 796         int ret;
 797         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 798                           "Scheduling function [%p(%p)] for deferred execution.\n",
 799                           function, context));
 800
 801         /*
 802          * Allocate/initialize DPC structure.  Note that this memory will be
 803          * freed by the callee.  The kernel handles the work_struct list  in a
 804          * way that allows us to also free its memory inside the callee.
 805          * Because we may want to schedule several tasks with different
 806          * parameters we can't use the approach some kernel code uses of
 807          * having a static work_struct.
 808          */
 809
 810         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 811         if (!dpc)
 812                 return AE_NO_MEMORY;
 813
 814         dpc->function = function;
 815         dpc->context = context;
 816
 817         /*
 818          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 819          * because the hotplug code may call driver .remove() functions,
 820          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 821          * to flush these workqueues.
 822          */
 823         queue = hp ? kacpi_hotplug_wq :
 824                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 825         dpc->wait = hp ? 1 : 0;
 826
 827         if (queue == kacpi_hotplug_wq)
 828                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 829         else if (queue == kacpi_notify_wq)
 830                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 831         else
 832                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 833
 834         /*
 835          * On some machines, a software-initiated SMI causes corruption unless
 836          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 837          * typically it's done in GPE-related methods that are run via
 838          * workqueues, so we can avoid the known corruption cases by always
 839          * queueing on CPU 0.
 840          */
 841         ret = queue_work_on(0, queue, &dpc->work);
 842
 843         if (!ret) {
 844                 printk(KERN_ERR PREFIX
 845                           "Call to queue_work() failed.\n");
 846                 status = AE_ERROR;
 847                 kfree(dpc);
 848         }
 849         return status;
 850 }
 851
 852 acpi_status acpi_os_execute(acpi_execute_type type,
 853                             acpi_osd_exec_callback function, void *context)
 854 {
 855         return __acpi_os_execute(type, function, context, 0);
 856 }
 857 EXPORT_SYMBOL(acpi_os_execute);
 858
 859 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 860         void *context)
 861 {
 862         return __acpi_os_execute(0, function, context, 1);
 863 }
 864
 865 void acpi_os_wait_events_complete(void *context)
 866 {
 867         flush_workqueue(kacpid_wq);
 868         flush_workqueue(kacpi_notify_wq);
 869 }
 870
 871 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 872
 873 /*
 874  * Deallocate the memory for a spinlock.
 875  */
 876 void acpi_os_delete_lock(acpi_spinlock handle)
 877 {
 878         return;
 879 }
 880
 881 acpi_status
 882 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 883 {
 884         struct semaphore *sem = NULL;
 885
 886         sem = acpi_os_allocate(sizeof(struct semaphore));
 887         if (!sem)
 888                 return AE_NO_MEMORY;
 889         memset(sem, 0, sizeof(struct semaphore));
 890
 891         sema_init(sem, initial_units);
 892
 893         *handle = (acpi_handle *) sem;
 894
 895         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 896                           *handle, initial_units));
 897
 898         return AE_OK;
 899 }
 900
 901 /*
 902  * TODO: A better way to delete semaphores?  Linux doesn't have a
 903  * 'delete_semaphore()' function -- may result in an invalid
 904  * pointer dereference for non-synchronized consumers.  Should
 905  * we at least check for blocked threads and signal/cancel them?
 906  */
 907
 908 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 909 {
 910         struct semaphore *sem = (struct semaphore *)handle;
 911
 912         if (!sem)
 913                 return AE_BAD_PARAMETER;
 914
 915         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 916
 917         BUG_ON(!list_empty(&sem->wait_list));
 918         kfree(sem);
 919         sem = NULL;
 920
 921         return AE_OK;
 922 }
 923
 924 /*
 925  * TODO: Support for units > 1?
 926  */
 927 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 928 {
 929         acpi_status status = AE_OK;
 930         struct semaphore *sem = (struct semaphore *)handle;
 931         long jiffies;
 932         int ret = 0;
 933
 934         if (!sem || (units < 1))
 935                 return AE_BAD_PARAMETER;
 936
 937         if (units > 1)
 938                 return AE_SUPPORT;
 939
 940         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 941                           handle, units, timeout));
 942
 943         if (timeout == ACPI_WAIT_FOREVER)
 944                 jiffies = MAX_SCHEDULE_TIMEOUT;
 945         else
 946                 jiffies = msecs_to_jiffies(timeout);
 947
 948         ret = down_timeout(sem, jiffies);
 949         if (ret)
 950                 status = AE_TIME;
 951
 952         if (ACPI_FAILURE(status)) {
 953                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 954                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 955                                   handle, units, timeout,
 956                                   acpi_format_exception(status)));
 957         } else {
 958                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 959                                   "Acquired semaphore[%p|%d|%d]", handle,
 960                                   units, timeout));
 961         }
 962
 963         return status;
 964 }
 965
 966 /*
 967  * TODO: Support for units > 1?
 968  */
 969 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 970 {
 971         struct semaphore *sem = (struct semaphore *)handle;
 972
 973         if (!sem || (units < 1))
 974                 return AE_BAD_PARAMETER;
 975
 976         if (units > 1)
 977                 return AE_SUPPORT;
 978
 979         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 980                           units));
 981
 982         up(sem);
 983
 984         return AE_OK;
 985 }
 986
 987 #ifdef ACPI_FUTURE_USAGE
 988 u32 acpi_os_get_line(char *buffer)
 989 {
 990
 991 #ifdef ENABLE_DEBUGGER
 992         if (acpi_in_debugger) {
 993                 u32 chars;
 994
 995                 kdb_read(buffer, sizeof(line_buf));
 996
 997                 /* remove the CR kdb includes */
 998                 chars = strlen(buffer) - 1;
 999                 buffer[chars] = '\0';
1000         }
1001 #endif
1002
1003         return 0;
1004 }
1005 #endif                          /*  ACPI_FUTURE_USAGE  */
1006
1007 acpi_status acpi_os_signal(u32 function, void *info)
1008 {
1009         switch (function) {
1010         case ACPI_SIGNAL_FATAL:
1011                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1012                 break;
1013         case ACPI_SIGNAL_BREAKPOINT:
1014                 /*
1015                  * AML Breakpoint
1016                  * ACPI spec. says to treat it as a NOP unless
1017                  * you are debugging.  So if/when we integrate
1018                  * AML debugger into the kernel debugger its
1019                  * hook will go here.  But until then it is
1020                  * not useful to print anything on breakpoints.
1021                  */
1022                 break;
1023         default:
1024                 break;
1025         }
1026
1027         return AE_OK;
1028 }
1029
1030 static int __init acpi_os_name_setup(char *str)
1031 {
1032         char *p = acpi_os_name;
1033         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1034
1035         if (!str || !*str)
1036                 return 0;
1037
1038         for (; count-- && str && *str; str++) {
1039                 if (isalnum(*str) || *str == ' ' || *str == ':')
1040                         *p++ = *str;
1041                 else if (*str == '\'' || *str == '"')
1042                         continue;
1043                 else
1044                         break;
1045         }
1046         *p = 0;
1047
1048         return 1;
1049
1050 }
1051
1052 __setup("acpi_os_name=", acpi_os_name_setup);
1053
1054 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1055 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1056
1057 struct osi_setup_entry {
1058         char string[OSI_STRING_LENGTH_MAX];
1059         bool enable;
1060 };
1061
1062 static struct osi_setup_entry __initdata osi_setup_entries[OSI_STRING_ENTRIES_MAX];
1063
1064 void __init acpi_osi_setup(char *str)
1065 {
1066         struct osi_setup_entry *osi;
1067         bool enable = true;
1068         int i;
1069
1070         if (!acpi_gbl_create_osi_method)
1071                 return;
1072
1073         if (str == NULL || *str == '\0') {
1074                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1075                 acpi_gbl_create_osi_method = FALSE;
1076                 return;
1077         }
1078
1079         if (*str == '!') {
1080                 str++;
1081                 enable = false;
1082         }
1083
1084         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1085                 osi = &osi_setup_entries[i];
1086                 if (!strcmp(osi->string, str)) {
1087                         osi->enable = enable;
1088                         break;
1089                 } else if (osi->string[0] == '\0') {
1090                         osi->enable = enable;
1091                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1092                         break;
1093                 }
1094         }
1095 }
1096
1097 static void __init set_osi_linux(unsigned int enable)
1098 {
1099         if (osi_linux.enable != enable)
1100                 osi_linux.enable = enable;
1101
1102         if (osi_linux.enable)
1103                 acpi_osi_setup("Linux");
1104         else
1105                 acpi_osi_setup("!Linux");
1106
1107         return;
1108 }
1109
1110 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1111 {
1112         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1113         osi_linux.dmi = 0;
1114         set_osi_linux(enable);
1115
1116         return;
1117 }
1118
1119 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1120 {
1121         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1122
1123         if (enable == -1)
1124                 return;
1125
1126         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1127         set_osi_linux(enable);
1128
1129         return;
1130 }
1131
1132 /*
1133  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1134  *
1135  * empty string disables _OSI
1136  * string starting with '!' disables that string
1137  * otherwise string is added to list, augmenting built-in strings
1138  */
1139 static void __init acpi_osi_setup_late(void)
1140 {
1141         struct osi_setup_entry *osi;
1142         char *str;
1143         int i;
1144         acpi_status status;
1145
1146         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1147                 osi = &osi_setup_entries[i];
1148                 str = osi->string;
1149
1150                 if (*str == '\0')
1151                         break;
1152                 if (osi->enable) {
1153                         status = acpi_install_interface(str);
1154
1155                         if (ACPI_SUCCESS(status))
1156                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1157                 } else {
1158                         status = acpi_remove_interface(str);
1159
1160                         if (ACPI_SUCCESS(status))
1161                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1162                 }
1163         }
1164 }
1165
1166 static int __init osi_setup(char *str)
1167 {
1168         if (str && !strcmp("Linux", str))
1169                 acpi_cmdline_osi_linux(1);
1170         else if (str && !strcmp("!Linux", str))
1171                 acpi_cmdline_osi_linux(0);
1172         else
1173                 acpi_osi_setup(str);
1174
1175         return 1;
1176 }
1177
1178 __setup("acpi_osi=", osi_setup);
1179
1180 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1181 static int __init acpi_serialize_setup(char *str)
1182 {
1183         printk(KERN_INFO PREFIX "serialize enabled\n");
1184
1185         acpi_gbl_all_methods_serialized = TRUE;
1186
1187         return 1;
1188 }
1189
1190 __setup("acpi_serialize", acpi_serialize_setup);
1191
1192 /* Check of resource interference between native drivers and ACPI
1193  * OperationRegions (SystemIO and System Memory only).
1194  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1195  * in arbitrary AML code and can interfere with legacy drivers.
1196  * acpi_enforce_resources= can be set to:
1197  *
1198  *   - strict (default) (2)
1199  *     -> further driver trying to access the resources will not load
1200  *   - lax              (1)
1201  *     -> further driver trying to access the resources will load, but you
1202  *     get a system message that something might go wrong...
1203  *
1204  *   - no               (0)
1205  *     -> ACPI Operation Region resources will not be registered
1206  *
1207  */
1208 #define ENFORCE_RESOURCES_STRICT 2
1209 #define ENFORCE_RESOURCES_LAX    1
1210 #define ENFORCE_RESOURCES_NO     0
1211
1212 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1213
1214 static int __init acpi_enforce_resources_setup(char *str)
1215 {
1216         if (str == NULL || *str == '\0')
1217                 return 0;
1218
1219         if (!strcmp("strict", str))
1220                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1221         else if (!strcmp("lax", str))
1222                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1223         else if (!strcmp("no", str))
1224                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1225
1226         return 1;
1227 }
1228
1229 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1230
1231 /* Check for resource conflicts between ACPI OperationRegions and native
1232  * drivers */
1233 int acpi_check_resource_conflict(const struct resource *res)
1234 {
1235         struct acpi_res_list *res_list_elem;
1236         int ioport = 0, clash = 0;
1237
1238         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1239                 return 0;
1240         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1241                 return 0;
1242
1243         ioport = res->flags & IORESOURCE_IO;
1244
1245         spin_lock(&acpi_res_lock);
1246         list_for_each_entry(res_list_elem, &resource_list_head,
1247                             resource_list) {
1248                 if (ioport && (res_list_elem->resource_type
1249                                != ACPI_ADR_SPACE_SYSTEM_IO))
1250                         continue;
1251                 if (!ioport && (res_list_elem->resource_type
1252                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1253                         continue;
1254
1255                 if (res->end < res_list_elem->start
1256                     || res_list_elem->end < res->start)
1257                         continue;
1258                 clash = 1;
1259                 break;
1260         }
1261         spin_unlock(&acpi_res_lock);
1262
1263         if (clash) {
1264                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1265                         printk(KERN_WARNING "ACPI: resource %s %pR"
1266                                " conflicts with ACPI region %s "
1267                                "[%s 0x%zx-0x%zx]\n",
1268                                res->name, res, res_list_elem->name,
1269                                (res_list_elem->resource_type ==
1270                                 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1271                                (size_t) res_list_elem->start,
1272                                (size_t) res_list_elem->end);
1273                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1274                                 printk(KERN_NOTICE "ACPI: This conflict may"
1275                                        " cause random problems and system"
1276                                        " instability\n");
1277                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1278                                " for this device, you should use it instead of"
1279                                " the native driver\n");
1280                 }
1281                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1282                         return -EBUSY;
1283         }
1284         return 0;
1285 }
1286 EXPORT_SYMBOL(acpi_check_resource_conflict);
1287
1288 int acpi_check_region(resource_size_t start, resource_size_t n,
1289                       const char *name)
1290 {
1291         struct resource res = {
1292                 .start = start,
1293                 .end   = start + n - 1,
1294                 .name  = name,
1295                 .flags = IORESOURCE_IO,
1296         };
1297
1298         return acpi_check_resource_conflict(&res);
1299 }
1300 EXPORT_SYMBOL(acpi_check_region);
1301
1302 /*
1303  * Let drivers know whether the resource checks are effective
1304  */
1305 int acpi_resources_are_enforced(void)
1306 {
1307         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1308 }
1309 EXPORT_SYMBOL(acpi_resources_are_enforced);
1310
1311 /*
1312  * Acquire a spinlock.
1313  *
1314  * handle is a pointer to the spinlock_t.
1315  */
1316
1317 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1318 {
1319         acpi_cpu_flags flags;
1320         spin_lock_irqsave(lockp, flags);
1321         return flags;
1322 }
1323
1324 /*
1325  * Release a spinlock. See above.
1326  */
1327
1328 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1329 {
1330         spin_unlock_irqrestore(lockp, flags);
1331 }
1332
1333 #ifndef ACPI_USE_LOCAL_CACHE
1334
1335 /*******************************************************************************
1336  *
1337  * FUNCTION:    acpi_os_create_cache
1338  *
1339  * PARAMETERS:  name      - Ascii name for the cache
1340  *              size      - Size of each cached object
1341  *              depth     - Maximum depth of the cache (in objects) <ignored>
1342  *              cache     - Where the new cache object is returned
1343  *
1344  * RETURN:      status
1345  *
1346  * DESCRIPTION: Create a cache object
1347  *
1348  ******************************************************************************/
1349
1350 acpi_status
1351 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1352 {
1353         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1354         if (*cache == NULL)
1355                 return AE_ERROR;
1356         else
1357                 return AE_OK;
1358 }
1359
1360 /*******************************************************************************
1361  *
1362  * FUNCTION:    acpi_os_purge_cache
1363  *
1364  * PARAMETERS:  Cache           - Handle to cache object
1365  *
1366  * RETURN:      Status
1367  *
1368  * DESCRIPTION: Free all objects within the requested cache.
1369  *
1370  ******************************************************************************/
1371
1372 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1373 {
1374         kmem_cache_shrink(cache);
1375         return (AE_OK);
1376 }
1377
1378 /*******************************************************************************
1379  *
1380  * FUNCTION:    acpi_os_delete_cache
1381  *
1382  * PARAMETERS:  Cache           - Handle to cache object
1383  *
1384  * RETURN:      Status
1385  *
1386  * DESCRIPTION: Free all objects within the requested cache and delete the
1387  *              cache object.
1388  *
1389  ******************************************************************************/
1390
1391 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1392 {
1393         kmem_cache_destroy(cache);
1394         return (AE_OK);
1395 }
1396
1397 /*******************************************************************************
1398  *
1399  * FUNCTION:    acpi_os_release_object
1400  *
1401  * PARAMETERS:  Cache       - Handle to cache object
1402  *              Object      - The object to be released
1403  *
1404  * RETURN:      None
1405  *
1406  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1407  *              the object is deleted.
1408  *
1409  ******************************************************************************/
1410
1411 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1412 {
1413         kmem_cache_free(cache, object);
1414         return (AE_OK);
1415 }
1416
1417 static inline int acpi_res_list_add(struct acpi_res_list *res)
1418 {
1419         struct acpi_res_list *res_list_elem;
1420
1421         list_for_each_entry(res_list_elem, &resource_list_head,
1422                             resource_list) {
1423
1424                 if (res->resource_type == res_list_elem->resource_type &&
1425                     res->start == res_list_elem->start &&
1426                     res->end == res_list_elem->end) {
1427
1428                         /*
1429                          * The Region(addr,len) already exist in the list,
1430                          * just increase the count
1431                          */
1432
1433                         res_list_elem->count++;
1434                         return 0;
1435                 }
1436         }
1437
1438         res->count = 1;
1439         list_add(&res->resource_list, &resource_list_head);
1440         return 1;
1441 }
1442
1443 static inline void acpi_res_list_del(struct acpi_res_list *res)
1444 {
1445         struct acpi_res_list *res_list_elem;
1446
1447         list_for_each_entry(res_list_elem, &resource_list_head,
1448                             resource_list) {
1449
1450                 if (res->resource_type == res_list_elem->resource_type &&
1451                     res->start == res_list_elem->start &&
1452                     res->end == res_list_elem->end) {
1453
1454                         /*
1455                          * If the res count is decreased to 0,
1456                          * remove and free it
1457                          */
1458
1459                         if (--res_list_elem->count == 0) {
1460                                 list_del(&res_list_elem->resource_list);
1461                                 kfree(res_list_elem);
1462                         }
1463                         return;
1464                 }
1465         }
1466 }
1467
1468 acpi_status
1469 acpi_os_invalidate_address(
1470     u8                   space_id,
1471     acpi_physical_address   address,
1472     acpi_size               length)
1473 {
1474         struct acpi_res_list res;
1475
1476         switch (space_id) {
1477         case ACPI_ADR_SPACE_SYSTEM_IO:
1478         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1479                 /* Only interference checks against SystemIO and SystemMemory
1480                    are needed */
1481                 res.start = address;
1482                 res.end = address + length - 1;
1483                 res.resource_type = space_id;
1484                 spin_lock(&acpi_res_lock);
1485                 acpi_res_list_del(&res);
1486                 spin_unlock(&acpi_res_lock);
1487                 break;
1488         case ACPI_ADR_SPACE_PCI_CONFIG:
1489         case ACPI_ADR_SPACE_EC:
1490         case ACPI_ADR_SPACE_SMBUS:
1491         case ACPI_ADR_SPACE_CMOS:
1492         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1493         case ACPI_ADR_SPACE_DATA_TABLE:
1494         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1495                 break;
1496         }
1497         return AE_OK;
1498 }
1499
1500 /******************************************************************************
1501  *
1502  * FUNCTION:    acpi_os_validate_address
1503  *
1504  * PARAMETERS:  space_id             - ACPI space ID
1505  *              address             - Physical address
1506  *              length              - Address length
1507  *
1508  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1509  *              should return AE_AML_ILLEGAL_ADDRESS.
1510  *
1511  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1512  *              the addresses accessed by AML operation regions.
1513  *
1514  *****************************************************************************/
1515
1516 acpi_status
1517 acpi_os_validate_address (
1518     u8                   space_id,
1519     acpi_physical_address   address,
1520     acpi_size               length,
1521     char *name)
1522 {
1523         struct acpi_res_list *res;
1524         int added;
1525         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1526                 return AE_OK;
1527
1528         switch (space_id) {
1529         case ACPI_ADR_SPACE_SYSTEM_IO:
1530         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1531                 /* Only interference checks against SystemIO and SystemMemory
1532                    are needed */
1533                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1534                 if (!res)
1535                         return AE_OK;
1536                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1537                 strlcpy(res->name, name, 5);
1538                 res->start = address;
1539                 res->end = address + length - 1;
1540                 res->resource_type = space_id;
1541                 spin_lock(&acpi_res_lock);
1542                 added = acpi_res_list_add(res);
1543                 spin_unlock(&acpi_res_lock);
1544                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1545                          "name: %s\n", added ? "Added" : "Already exist",
1546                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1547                          ? "SystemIO" : "System Memory",
1548                          (unsigned long long)res->start,
1549                          (unsigned long long)res->end,
1550                          res->name);
1551                 if (!added)
1552                         kfree(res);
1553                 break;
1554         case ACPI_ADR_SPACE_PCI_CONFIG:
1555         case ACPI_ADR_SPACE_EC:
1556         case ACPI_ADR_SPACE_SMBUS:
1557         case ACPI_ADR_SPACE_CMOS:
1558         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1559         case ACPI_ADR_SPACE_DATA_TABLE:
1560         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1561                 break;
1562         }
1563         return AE_OK;
1564 }
1565 #endif
1566
1567 acpi_status __init acpi_os_initialize(void)
1568 {
1569         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1570         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1571         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1572         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1573
1574         return AE_OK;
1575 }
1576
1577 acpi_status __init acpi_os_initialize1(void)
1578 {
1579         kacpid_wq = create_workqueue("kacpid");
1580         kacpi_notify_wq = create_workqueue("kacpi_notify");
1581         kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
1582         BUG_ON(!kacpid_wq);
1583         BUG_ON(!kacpi_notify_wq);
1584         BUG_ON(!kacpi_hotplug_wq);
1585         acpi_install_interface_handler(acpi_osi_handler);
1586         acpi_osi_setup_late();
1587         return AE_OK;
1588 }
1589
1590 acpi_status acpi_os_terminate(void)
1591 {
1592         if (acpi_irq_handler) {
1593                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
1594                                                  acpi_irq_handler);
1595         }
1596
1597         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1598         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1599         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1600         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1601
1602         destroy_workqueue(kacpid_wq);
1603         destroy_workqueue(kacpi_notify_wq);
1604         destroy_workqueue(kacpi_hotplug_wq);
1605
1606         return AE_OK;
1607 }