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 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  99 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
 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         unsigned int    known:1;
 139 } osi_linux = { 0, 0, 0, 0};
 140
 141 static void __init acpi_request_region (struct acpi_generic_address *addr,
 142         unsigned int length, char *desc)
 143 {
 144         struct resource *res;
 145
 146         if (!addr->address || !length)
 147                 return;
 148
 149         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 150                 res = request_region(addr->address, length, desc);
 151         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 152                 res = request_mem_region(addr->address, length, desc);
 153 }
 154
 155 static int __init acpi_reserve_resources(void)
 156 {
 157         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 158                 "ACPI PM1a_EVT_BLK");
 159
 160         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 161                 "ACPI PM1b_EVT_BLK");
 162
 163         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 164                 "ACPI PM1a_CNT_BLK");
 165
 166         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 167                 "ACPI PM1b_CNT_BLK");
 168
 169         if (acpi_gbl_FADT.pm_timer_length == 4)
 170                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 171
 172         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 173                 "ACPI PM2_CNT_BLK");
 174
 175         /* Length of GPE blocks must be a non-negative multiple of 2 */
 176
 177         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 178                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 179                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 180
 181         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 182                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 183                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 184
 185         return 0;
 186 }
 187 device_initcall(acpi_reserve_resources);
 188
 189 acpi_status __init acpi_os_initialize(void)
 190 {
 191         return AE_OK;
 192 }
 193
 194 acpi_status acpi_os_initialize1(void)
 195 {
 196         kacpid_wq = create_workqueue("kacpid");
 197         kacpi_notify_wq = create_workqueue("kacpi_notify");
 198         kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
 199         BUG_ON(!kacpid_wq);
 200         BUG_ON(!kacpi_notify_wq);
 201         BUG_ON(!kacpi_hotplug_wq);
 202         return AE_OK;
 203 }
 204
 205 acpi_status acpi_os_terminate(void)
 206 {
 207         if (acpi_irq_handler) {
 208                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 209                                                  acpi_irq_handler);
 210         }
 211
 212         destroy_workqueue(kacpid_wq);
 213         destroy_workqueue(kacpi_notify_wq);
 214         destroy_workqueue(kacpi_hotplug_wq);
 215
 216         return AE_OK;
 217 }
 218
 219 void acpi_os_printf(const char *fmt, ...)
 220 {
 221         va_list args;
 222         va_start(args, fmt);
 223         acpi_os_vprintf(fmt, args);
 224         va_end(args);
 225 }
 226
 227 void acpi_os_vprintf(const char *fmt, va_list args)
 228 {
 229         static char buffer[512];
 230
 231         vsprintf(buffer, fmt, args);
 232
 233 #ifdef ENABLE_DEBUGGER
 234         if (acpi_in_debugger) {
 235                 kdb_printf("%s", buffer);
 236         } else {
 237                 printk(KERN_CONT "%s", buffer);
 238         }
 239 #else
 240         printk(KERN_CONT "%s", buffer);
 241 #endif
 242 }
 243
 244 acpi_physical_address __init acpi_os_get_root_pointer(void)
 245 {
 246         if (efi_enabled) {
 247                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 248                         return efi.acpi20;
 249                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 250                         return efi.acpi;
 251                 else {
 252                         printk(KERN_ERR PREFIX
 253                                "System description tables not found\n");
 254                         return 0;
 255                 }
 256         } else {
 257                 acpi_physical_address pa = 0;
 258
 259                 acpi_find_root_pointer(&pa);
 260                 return pa;
 261         }
 262 }
 263
 264 void __iomem *__init_refok
 265 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 266 {
 267         if (phys > ULONG_MAX) {
 268                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 269                 return NULL;
 270         }
 271         if (acpi_gbl_permanent_mmap)
 272                 /*
 273                 * ioremap checks to ensure this is in reserved space
 274                 */
 275                 return ioremap((unsigned long)phys, size);
 276         else
 277                 return __acpi_map_table((unsigned long)phys, size);
 278 }
 279 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 280
 281 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 282 {
 283         if (acpi_gbl_permanent_mmap)
 284                 iounmap(virt);
 285         else
 286                 __acpi_unmap_table(virt, size);
 287 }
 288 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 289
 290 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 291 {
 292         if (!acpi_gbl_permanent_mmap)
 293                 __acpi_unmap_table(virt, size);
 294 }
 295
 296 #ifdef ACPI_FUTURE_USAGE
 297 acpi_status
 298 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 299 {
 300         if (!phys || !virt)
 301                 return AE_BAD_PARAMETER;
 302
 303         *phys = virt_to_phys(virt);
 304
 305         return AE_OK;
 306 }
 307 #endif
 308
 309 #define ACPI_MAX_OVERRIDE_LEN 100
 310
 311 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 312
 313 acpi_status
 314 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 315                             acpi_string * new_val)
 316 {
 317         if (!init_val || !new_val)
 318                 return AE_BAD_PARAMETER;
 319
 320         *new_val = NULL;
 321         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 322                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 323                        acpi_os_name);
 324                 *new_val = acpi_os_name;
 325         }
 326
 327         return AE_OK;
 328 }
 329
 330 acpi_status
 331 acpi_os_table_override(struct acpi_table_header * existing_table,
 332                        struct acpi_table_header ** new_table)
 333 {
 334         if (!existing_table || !new_table)
 335                 return AE_BAD_PARAMETER;
 336
 337         *new_table = NULL;
 338
 339 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 340         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 341                 *new_table = (struct acpi_table_header *)AmlCode;
 342 #endif
 343         if (*new_table != NULL) {
 344                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 345                            "this is unsafe: tainting kernel\n",
 346                        existing_table->signature,
 347                        existing_table->oem_table_id);
 348                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 349         }
 350         return AE_OK;
 351 }
 352
 353 static irqreturn_t acpi_irq(int irq, void *dev_id)
 354 {
 355         u32 handled;
 356
 357         handled = (*acpi_irq_handler) (acpi_irq_context);
 358
 359         if (handled) {
 360                 acpi_irq_handled++;
 361                 return IRQ_HANDLED;
 362         } else {
 363                 acpi_irq_not_handled++;
 364                 return IRQ_NONE;
 365         }
 366 }
 367
 368 acpi_status
 369 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 370                                   void *context)
 371 {
 372         unsigned int irq;
 373
 374         acpi_irq_stats_init();
 375
 376         /*
 377          * Ignore the GSI from the core, and use the value in our copy of the
 378          * FADT. It may not be the same if an interrupt source override exists
 379          * for the SCI.
 380          */
 381         gsi = acpi_gbl_FADT.sci_interrupt;
 382         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 383                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 384                        gsi);
 385                 return AE_OK;
 386         }
 387
 388         acpi_irq_handler = handler;
 389         acpi_irq_context = context;
 390         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 391                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 392                 return AE_NOT_ACQUIRED;
 393         }
 394         acpi_irq_irq = irq;
 395
 396         return AE_OK;
 397 }
 398
 399 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 400 {
 401         if (irq) {
 402                 free_irq(irq, acpi_irq);
 403                 acpi_irq_handler = NULL;
 404                 acpi_irq_irq = 0;
 405         }
 406
 407         return AE_OK;
 408 }
 409
 410 /*
 411  * Running in interpreter thread context, safe to sleep
 412  */
 413
 414 void acpi_os_sleep(u64 ms)
 415 {
 416         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 417 }
 418
 419 void acpi_os_stall(u32 us)
 420 {
 421         while (us) {
 422                 u32 delay = 1000;
 423
 424                 if (delay > us)
 425                         delay = us;
 426                 udelay(delay);
 427                 touch_nmi_watchdog();
 428                 us -= delay;
 429         }
 430 }
 431
 432 /*
 433  * Support ACPI 3.0 AML Timer operand
 434  * Returns 64-bit free-running, monotonically increasing timer
 435  * with 100ns granularity
 436  */
 437 u64 acpi_os_get_timer(void)
 438 {
 439         static u64 t;
 440
 441 #ifdef  CONFIG_HPET
 442         /* TBD: use HPET if available */
 443 #endif
 444
 445 #ifdef  CONFIG_X86_PM_TIMER
 446         /* TBD: default to PM timer if HPET was not available */
 447 #endif
 448         if (!t)
 449                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 450
 451         return ++t;
 452 }
 453
 454 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 455 {
 456         u32 dummy;
 457
 458         if (!value)
 459                 value = &dummy;
 460
 461         *value = 0;
 462         if (width <= 8) {
 463                 *(u8 *) value = inb(port);
 464         } else if (width <= 16) {
 465                 *(u16 *) value = inw(port);
 466         } else if (width <= 32) {
 467                 *(u32 *) value = inl(port);
 468         } else {
 469                 BUG();
 470         }
 471
 472         return AE_OK;
 473 }
 474
 475 EXPORT_SYMBOL(acpi_os_read_port);
 476
 477 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 478 {
 479         if (width <= 8) {
 480                 outb(value, port);
 481         } else if (width <= 16) {
 482                 outw(value, port);
 483         } else if (width <= 32) {
 484                 outl(value, port);
 485         } else {
 486                 BUG();
 487         }
 488
 489         return AE_OK;
 490 }
 491
 492 EXPORT_SYMBOL(acpi_os_write_port);
 493
 494 acpi_status
 495 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 496 {
 497         u32 dummy;
 498         void __iomem *virt_addr;
 499
 500         virt_addr = ioremap(phys_addr, width);
 501         if (!value)
 502                 value = &dummy;
 503
 504         switch (width) {
 505         case 8:
 506                 *(u8 *) value = readb(virt_addr);
 507                 break;
 508         case 16:
 509                 *(u16 *) value = readw(virt_addr);
 510                 break;
 511         case 32:
 512                 *(u32 *) value = readl(virt_addr);
 513                 break;
 514         default:
 515                 BUG();
 516         }
 517
 518         iounmap(virt_addr);
 519
 520         return AE_OK;
 521 }
 522
 523 acpi_status
 524 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 525 {
 526         void __iomem *virt_addr;
 527
 528         virt_addr = ioremap(phys_addr, width);
 529
 530         switch (width) {
 531         case 8:
 532                 writeb(value, virt_addr);
 533                 break;
 534         case 16:
 535                 writew(value, virt_addr);
 536                 break;
 537         case 32:
 538                 writel(value, virt_addr);
 539                 break;
 540         default:
 541                 BUG();
 542         }
 543
 544         iounmap(virt_addr);
 545
 546         return AE_OK;
 547 }
 548
 549 acpi_status
 550 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 551                                u32 *value, u32 width)
 552 {
 553         int result, size;
 554
 555         if (!value)
 556                 return AE_BAD_PARAMETER;
 557
 558         switch (width) {
 559         case 8:
 560                 size = 1;
 561                 break;
 562         case 16:
 563                 size = 2;
 564                 break;
 565         case 32:
 566                 size = 4;
 567                 break;
 568         default:
 569                 return AE_ERROR;
 570         }
 571
 572         result = raw_pci_read(pci_id->segment, pci_id->bus,
 573                                 PCI_DEVFN(pci_id->device, pci_id->function),
 574                                 reg, size, value);
 575
 576         return (result ? AE_ERROR : AE_OK);
 577 }
 578
 579 acpi_status
 580 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 581                                 u64 value, u32 width)
 582 {
 583         int result, size;
 584
 585         switch (width) {
 586         case 8:
 587                 size = 1;
 588                 break;
 589         case 16:
 590                 size = 2;
 591                 break;
 592         case 32:
 593                 size = 4;
 594                 break;
 595         default:
 596                 return AE_ERROR;
 597         }
 598
 599         result = raw_pci_write(pci_id->segment, pci_id->bus,
 600                                 PCI_DEVFN(pci_id->device, pci_id->function),
 601                                 reg, size, value);
 602
 603         return (result ? AE_ERROR : AE_OK);
 604 }
 605
 606 /* TODO: Change code to take advantage of driver model more */
 607 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 608                                     acpi_handle chandle,        /* current node */
 609                                     struct acpi_pci_id **id,
 610                                     int *is_bridge, u8 * bus_number)
 611 {
 612         acpi_handle handle;
 613         struct acpi_pci_id *pci_id = *id;
 614         acpi_status status;
 615         unsigned long long temp;
 616         acpi_object_type type;
 617
 618         acpi_get_parent(chandle, &handle);
 619         if (handle != rhandle) {
 620                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 621                                         bus_number);
 622
 623                 status = acpi_get_type(handle, &type);
 624                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 625                         return;
 626
 627                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 628                                           &temp);
 629                 if (ACPI_SUCCESS(status)) {
 630                         u32 val;
 631                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 632                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 633
 634                         if (*is_bridge)
 635                                 pci_id->bus = *bus_number;
 636
 637                         /* any nicer way to get bus number of bridge ? */
 638                         status =
 639                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 640                                                            8);
 641                         if (ACPI_SUCCESS(status)
 642                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 643                                 status =
 644                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 645                                                                    &val, 8);
 646                                 if (!ACPI_SUCCESS(status)) {
 647                                         /* Certainly broken...  FIX ME */
 648                                         return;
 649                                 }
 650                                 *is_bridge = 1;
 651                                 pci_id->bus = val;
 652                                 status =
 653                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 654                                                                    &val, 8);
 655                                 if (ACPI_SUCCESS(status)) {
 656                                         *bus_number = val;
 657                                 }
 658                         } else
 659                                 *is_bridge = 0;
 660                 }
 661         }
 662 }
 663
 664 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 665                            acpi_handle chandle, /* current node */
 666                            struct acpi_pci_id **id)
 667 {
 668         int is_bridge = 1;
 669         u8 bus_number = (*id)->bus;
 670
 671         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 672 }
 673
 674 static void acpi_os_execute_deferred(struct work_struct *work)
 675 {
 676         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 677
 678         if (dpc->wait)
 679                 acpi_os_wait_events_complete(NULL);
 680
 681         dpc->function(dpc->context);
 682         kfree(dpc);
 683 }
 684
 685 /*******************************************************************************
 686  *
 687  * FUNCTION:    acpi_os_execute
 688  *
 689  * PARAMETERS:  Type               - Type of the callback
 690  *              Function           - Function to be executed
 691  *              Context            - Function parameters
 692  *
 693  * RETURN:      Status
 694  *
 695  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 696  *              immediately executes function on a separate thread.
 697  *
 698  ******************************************************************************/
 699
 700 static acpi_status __acpi_os_execute(acpi_execute_type type,
 701         acpi_osd_exec_callback function, void *context, int hp)
 702 {
 703         acpi_status status = AE_OK;
 704         struct acpi_os_dpc *dpc;
 705         struct workqueue_struct *queue;
 706         int ret;
 707         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 708                           "Scheduling function [%p(%p)] for deferred execution.\n",
 709                           function, context));
 710
 711         /*
 712          * Allocate/initialize DPC structure.  Note that this memory will be
 713          * freed by the callee.  The kernel handles the work_struct list  in a
 714          * way that allows us to also free its memory inside the callee.
 715          * Because we may want to schedule several tasks with different
 716          * parameters we can't use the approach some kernel code uses of
 717          * having a static work_struct.
 718          */
 719
 720         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 721         if (!dpc)
 722                 return AE_NO_MEMORY;
 723
 724         dpc->function = function;
 725         dpc->context = context;
 726
 727         /*
 728          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 729          * because the hotplug code may call driver .remove() functions,
 730          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 731          * to flush these workqueues.
 732          */
 733         queue = hp ? kacpi_hotplug_wq :
 734                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 735         dpc->wait = hp ? 1 : 0;
 736
 737         if (queue == kacpi_hotplug_wq)
 738                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 739         else if (queue == kacpi_notify_wq)
 740                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 741         else
 742                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 743
 744         /*
 745          * On some machines, a software-initiated SMI causes corruption unless
 746          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 747          * typically it's done in GPE-related methods that are run via
 748          * workqueues, so we can avoid the known corruption cases by always
 749          * queueing on CPU 0.
 750          */
 751         ret = queue_work_on(0, queue, &dpc->work);
 752
 753         if (!ret) {
 754                 printk(KERN_ERR PREFIX
 755                           "Call to queue_work() failed.\n");
 756                 status = AE_ERROR;
 757                 kfree(dpc);
 758         }
 759         return status;
 760 }
 761
 762 acpi_status acpi_os_execute(acpi_execute_type type,
 763                             acpi_osd_exec_callback function, void *context)
 764 {
 765         return __acpi_os_execute(type, function, context, 0);
 766 }
 767 EXPORT_SYMBOL(acpi_os_execute);
 768
 769 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 770         void *context)
 771 {
 772         return __acpi_os_execute(0, function, context, 1);
 773 }
 774
 775 void acpi_os_wait_events_complete(void *context)
 776 {
 777         flush_workqueue(kacpid_wq);
 778         flush_workqueue(kacpi_notify_wq);
 779 }
 780
 781 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 782
 783 /*
 784  * Allocate the memory for a spinlock and initialize it.
 785  */
 786 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 787 {
 788         spin_lock_init(*handle);
 789
 790         return AE_OK;
 791 }
 792
 793 /*
 794  * Deallocate the memory for a spinlock.
 795  */
 796 void acpi_os_delete_lock(acpi_spinlock handle)
 797 {
 798         return;
 799 }
 800
 801 acpi_status
 802 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 803 {
 804         struct semaphore *sem = NULL;
 805
 806         sem = acpi_os_allocate(sizeof(struct semaphore));
 807         if (!sem)
 808                 return AE_NO_MEMORY;
 809         memset(sem, 0, sizeof(struct semaphore));
 810
 811         sema_init(sem, initial_units);
 812
 813         *handle = (acpi_handle *) sem;
 814
 815         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 816                           *handle, initial_units));
 817
 818         return AE_OK;
 819 }
 820
 821 /*
 822  * TODO: A better way to delete semaphores?  Linux doesn't have a
 823  * 'delete_semaphore()' function -- may result in an invalid
 824  * pointer dereference for non-synchronized consumers.  Should
 825  * we at least check for blocked threads and signal/cancel them?
 826  */
 827
 828 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 829 {
 830         struct semaphore *sem = (struct semaphore *)handle;
 831
 832         if (!sem)
 833                 return AE_BAD_PARAMETER;
 834
 835         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 836
 837         BUG_ON(!list_empty(&sem->wait_list));
 838         kfree(sem);
 839         sem = NULL;
 840
 841         return AE_OK;
 842 }
 843
 844 /*
 845  * TODO: Support for units > 1?
 846  */
 847 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 848 {
 849         acpi_status status = AE_OK;
 850         struct semaphore *sem = (struct semaphore *)handle;
 851         long jiffies;
 852         int ret = 0;
 853
 854         if (!sem || (units < 1))
 855                 return AE_BAD_PARAMETER;
 856
 857         if (units > 1)
 858                 return AE_SUPPORT;
 859
 860         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 861                           handle, units, timeout));
 862
 863         if (timeout == ACPI_WAIT_FOREVER)
 864                 jiffies = MAX_SCHEDULE_TIMEOUT;
 865         else
 866                 jiffies = msecs_to_jiffies(timeout);
 867
 868         ret = down_timeout(sem, jiffies);
 869         if (ret)
 870                 status = AE_TIME;
 871
 872         if (ACPI_FAILURE(status)) {
 873                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 874                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 875                                   handle, units, timeout,
 876                                   acpi_format_exception(status)));
 877         } else {
 878                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 879                                   "Acquired semaphore[%p|%d|%d]", handle,
 880                                   units, timeout));
 881         }
 882
 883         return status;
 884 }
 885
 886 /*
 887  * TODO: Support for units > 1?
 888  */
 889 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 890 {
 891         struct semaphore *sem = (struct semaphore *)handle;
 892
 893         if (!sem || (units < 1))
 894                 return AE_BAD_PARAMETER;
 895
 896         if (units > 1)
 897                 return AE_SUPPORT;
 898
 899         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 900                           units));
 901
 902         up(sem);
 903
 904         return AE_OK;
 905 }
 906
 907 #ifdef ACPI_FUTURE_USAGE
 908 u32 acpi_os_get_line(char *buffer)
 909 {
 910
 911 #ifdef ENABLE_DEBUGGER
 912         if (acpi_in_debugger) {
 913                 u32 chars;
 914
 915                 kdb_read(buffer, sizeof(line_buf));
 916
 917                 /* remove the CR kdb includes */
 918                 chars = strlen(buffer) - 1;
 919                 buffer[chars] = '\0';
 920         }
 921 #endif
 922
 923         return 0;
 924 }
 925 #endif                          /*  ACPI_FUTURE_USAGE  */
 926
 927 acpi_status acpi_os_signal(u32 function, void *info)
 928 {
 929         switch (function) {
 930         case ACPI_SIGNAL_FATAL:
 931                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 932                 break;
 933         case ACPI_SIGNAL_BREAKPOINT:
 934                 /*
 935                  * AML Breakpoint
 936                  * ACPI spec. says to treat it as a NOP unless
 937                  * you are debugging.  So if/when we integrate
 938                  * AML debugger into the kernel debugger its
 939                  * hook will go here.  But until then it is
 940                  * not useful to print anything on breakpoints.
 941                  */
 942                 break;
 943         default:
 944                 break;
 945         }
 946
 947         return AE_OK;
 948 }
 949
 950 static int __init acpi_os_name_setup(char *str)
 951 {
 952         char *p = acpi_os_name;
 953         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 954
 955         if (!str || !*str)
 956                 return 0;
 957
 958         for (; count-- && str && *str; str++) {
 959                 if (isalnum(*str) || *str == ' ' || *str == ':')
 960                         *p++ = *str;
 961                 else if (*str == '\'' || *str == '"')
 962                         continue;
 963                 else
 964                         break;
 965         }
 966         *p = 0;
 967
 968         return 1;
 969
 970 }
 971
 972 __setup("acpi_os_name=", acpi_os_name_setup);
 973
 974 static void __init set_osi_linux(unsigned int enable)
 975 {
 976         if (osi_linux.enable != enable) {
 977                 osi_linux.enable = enable;
 978                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 979                         enable ? "Add": "Delet");
 980         }
 981         return;
 982 }
 983
 984 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 985 {
 986         osi_linux.cmdline = 1;  /* cmdline set the default */
 987         set_osi_linux(enable);
 988
 989         return;
 990 }
 991
 992 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
 993 {
 994         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
 995
 996         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
 997
 998         if (enable == -1)
 999                 return;
1000
1001         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1002
1003         set_osi_linux(enable);
1004
1005         return;
1006 }
1007
1008 /*
1009  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1010  *
1011  * empty string disables _OSI
1012  * string starting with '!' disables that string
1013  * otherwise string is added to list, augmenting built-in strings
1014  */
1015 int __init acpi_osi_setup(char *str)
1016 {
1017         if (str == NULL || *str == '\0') {
1018                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1019                 acpi_gbl_create_osi_method = FALSE;
1020         } else if (!strcmp("!Linux", str)) {
1021                 acpi_cmdline_osi_linux(0);      /* !enable */
1022         } else if (*str == '!') {
1023                 if (acpi_osi_invalidate(++str) == AE_OK)
1024                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1025         } else if (!strcmp("Linux", str)) {
1026                 acpi_cmdline_osi_linux(1);      /* enable */
1027         } else if (*osi_additional_string == '\0') {
1028                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1029                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1030         }
1031
1032         return 1;
1033 }
1034
1035 __setup("acpi_osi=", acpi_osi_setup);
1036
1037 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1038 static int __init acpi_serialize_setup(char *str)
1039 {
1040         printk(KERN_INFO PREFIX "serialize enabled\n");
1041
1042         acpi_gbl_all_methods_serialized = TRUE;
1043
1044         return 1;
1045 }
1046
1047 __setup("acpi_serialize", acpi_serialize_setup);
1048
1049 /*
1050  * Wake and Run-Time GPES are expected to be separate.
1051  * We disable wake-GPEs at run-time to prevent spurious
1052  * interrupts.
1053  *
1054  * However, if a system exists that shares Wake and
1055  * Run-time events on the same GPE this flag is available
1056  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1057  */
1058 static int __init acpi_wake_gpes_always_on_setup(char *str)
1059 {
1060         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1061
1062         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1063
1064         return 1;
1065 }
1066
1067 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1068
1069 /* Check of resource interference between native drivers and ACPI
1070  * OperationRegions (SystemIO and System Memory only).
1071  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1072  * in arbitrary AML code and can interfere with legacy drivers.
1073  * acpi_enforce_resources= can be set to:
1074  *
1075  *   - strict (default) (2)
1076  *     -> further driver trying to access the resources will not load
1077  *   - lax              (1)
1078  *     -> further driver trying to access the resources will load, but you
1079  *     get a system message that something might go wrong...
1080  *
1081  *   - no               (0)
1082  *     -> ACPI Operation Region resources will not be registered
1083  *
1084  */
1085 #define ENFORCE_RESOURCES_STRICT 2
1086 #define ENFORCE_RESOURCES_LAX    1
1087 #define ENFORCE_RESOURCES_NO     0
1088
1089 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1090
1091 static int __init acpi_enforce_resources_setup(char *str)
1092 {
1093         if (str == NULL || *str == '\0')
1094                 return 0;
1095
1096         if (!strcmp("strict", str))
1097                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1098         else if (!strcmp("lax", str))
1099                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1100         else if (!strcmp("no", str))
1101                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1102
1103         return 1;
1104 }
1105
1106 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1107
1108 /* Check for resource conflicts between ACPI OperationRegions and native
1109  * drivers */
1110 int acpi_check_resource_conflict(const struct resource *res)
1111 {
1112         struct acpi_res_list *res_list_elem;
1113         int ioport;
1114         int clash = 0;
1115
1116         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1117                 return 0;
1118         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1119                 return 0;
1120
1121         ioport = res->flags & IORESOURCE_IO;
1122
1123         spin_lock(&acpi_res_lock);
1124         list_for_each_entry(res_list_elem, &resource_list_head,
1125                             resource_list) {
1126                 if (ioport && (res_list_elem->resource_type
1127                                != ACPI_ADR_SPACE_SYSTEM_IO))
1128                         continue;
1129                 if (!ioport && (res_list_elem->resource_type
1130                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1131                         continue;
1132
1133                 if (res->end < res_list_elem->start
1134                     || res_list_elem->end < res->start)
1135                         continue;
1136                 clash = 1;
1137                 break;
1138         }
1139         spin_unlock(&acpi_res_lock);
1140
1141         if (clash) {
1142                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1143                         printk(KERN_WARNING "ACPI: resource %s %pR"
1144                                " conflicts with ACPI region %s %pR\n",
1145                                res->name, res, res_list_elem->name,
1146                                res_list_elem);
1147                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1148                                 printk(KERN_NOTICE "ACPI: This conflict may"
1149                                        " cause random problems and system"
1150                                        " instability\n");
1151                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1152                                " for this device, you should use it instead of"
1153                                " the native driver\n");
1154                 }
1155                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1156                         return -EBUSY;
1157         }
1158         return 0;
1159 }
1160 EXPORT_SYMBOL(acpi_check_resource_conflict);
1161
1162 int acpi_check_region(resource_size_t start, resource_size_t n,
1163                       const char *name)
1164 {
1165         struct resource res = {
1166                 .start = start,
1167                 .end   = start + n - 1,
1168                 .name  = name,
1169                 .flags = IORESOURCE_IO,
1170         };
1171
1172         return acpi_check_resource_conflict(&res);
1173 }
1174 EXPORT_SYMBOL(acpi_check_region);
1175
1176 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1177                       const char *name)
1178 {
1179         struct resource res = {
1180                 .start = start,
1181                 .end   = start + n - 1,
1182                 .name  = name,
1183                 .flags = IORESOURCE_MEM,
1184         };
1185
1186         return acpi_check_resource_conflict(&res);
1187
1188 }
1189 EXPORT_SYMBOL(acpi_check_mem_region);
1190
1191 /*
1192  * Let drivers know whether the resource checks are effective
1193  */
1194 int acpi_resources_are_enforced(void)
1195 {
1196         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1197 }
1198 EXPORT_SYMBOL(acpi_resources_are_enforced);
1199
1200 /*
1201  * Acquire a spinlock.
1202  *
1203  * handle is a pointer to the spinlock_t.
1204  */
1205
1206 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1207 {
1208         acpi_cpu_flags flags;
1209         spin_lock_irqsave(lockp, flags);
1210         return flags;
1211 }
1212
1213 /*
1214  * Release a spinlock. See above.
1215  */
1216
1217 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1218 {
1219         spin_unlock_irqrestore(lockp, flags);
1220 }
1221
1222 #ifndef ACPI_USE_LOCAL_CACHE
1223
1224 /*******************************************************************************
1225  *
1226  * FUNCTION:    acpi_os_create_cache
1227  *
1228  * PARAMETERS:  name      - Ascii name for the cache
1229  *              size      - Size of each cached object
1230  *              depth     - Maximum depth of the cache (in objects) <ignored>
1231  *              cache     - Where the new cache object is returned
1232  *
1233  * RETURN:      status
1234  *
1235  * DESCRIPTION: Create a cache object
1236  *
1237  ******************************************************************************/
1238
1239 acpi_status
1240 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1241 {
1242         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1243         if (*cache == NULL)
1244                 return AE_ERROR;
1245         else
1246                 return AE_OK;
1247 }
1248
1249 /*******************************************************************************
1250  *
1251  * FUNCTION:    acpi_os_purge_cache
1252  *
1253  * PARAMETERS:  Cache           - Handle to cache object
1254  *
1255  * RETURN:      Status
1256  *
1257  * DESCRIPTION: Free all objects within the requested cache.
1258  *
1259  ******************************************************************************/
1260
1261 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1262 {
1263         kmem_cache_shrink(cache);
1264         return (AE_OK);
1265 }
1266
1267 /*******************************************************************************
1268  *
1269  * FUNCTION:    acpi_os_delete_cache
1270  *
1271  * PARAMETERS:  Cache           - Handle to cache object
1272  *
1273  * RETURN:      Status
1274  *
1275  * DESCRIPTION: Free all objects within the requested cache and delete the
1276  *              cache object.
1277  *
1278  ******************************************************************************/
1279
1280 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1281 {
1282         kmem_cache_destroy(cache);
1283         return (AE_OK);
1284 }
1285
1286 /*******************************************************************************
1287  *
1288  * FUNCTION:    acpi_os_release_object
1289  *
1290  * PARAMETERS:  Cache       - Handle to cache object
1291  *              Object      - The object to be released
1292  *
1293  * RETURN:      None
1294  *
1295  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1296  *              the object is deleted.
1297  *
1298  ******************************************************************************/
1299
1300 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1301 {
1302         kmem_cache_free(cache, object);
1303         return (AE_OK);
1304 }
1305
1306 /******************************************************************************
1307  *
1308  * FUNCTION:    acpi_os_validate_interface
1309  *
1310  * PARAMETERS:  interface           - Requested interface to be validated
1311  *
1312  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1313  *
1314  * DESCRIPTION: Match an interface string to the interfaces supported by the
1315  *              host. Strings originate from an AML call to the _OSI method.
1316  *
1317  *****************************************************************************/
1318
1319 acpi_status
1320 acpi_os_validate_interface (char *interface)
1321 {
1322         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1323                 return AE_OK;
1324         if (!strcmp("Linux", interface)) {
1325
1326                 printk(KERN_NOTICE PREFIX
1327                         "BIOS _OSI(Linux) query %s%s\n",
1328                         osi_linux.enable ? "honored" : "ignored",
1329                         osi_linux.cmdline ? " via cmdline" :
1330                         osi_linux.dmi ? " via DMI" : "");
1331
1332                 if (osi_linux.enable)
1333                         return AE_OK;
1334         }
1335         return AE_SUPPORT;
1336 }
1337
1338 static inline int acpi_res_list_add(struct acpi_res_list *res)
1339 {
1340         struct acpi_res_list *res_list_elem;
1341
1342         list_for_each_entry(res_list_elem, &resource_list_head,
1343                             resource_list) {
1344
1345                 if (res->resource_type == res_list_elem->resource_type &&
1346                     res->start == res_list_elem->start &&
1347                     res->end == res_list_elem->end) {
1348
1349                         /*
1350                          * The Region(addr,len) already exist in the list,
1351                          * just increase the count
1352                          */
1353
1354                         res_list_elem->count++;
1355                         return 0;
1356                 }
1357         }
1358
1359         res->count = 1;
1360         list_add(&res->resource_list, &resource_list_head);
1361         return 1;
1362 }
1363
1364 static inline void acpi_res_list_del(struct acpi_res_list *res)
1365 {
1366         struct acpi_res_list *res_list_elem;
1367
1368         list_for_each_entry(res_list_elem, &resource_list_head,
1369                             resource_list) {
1370
1371                 if (res->resource_type == res_list_elem->resource_type &&
1372                     res->start == res_list_elem->start &&
1373                     res->end == res_list_elem->end) {
1374
1375                         /*
1376                          * If the res count is decreased to 0,
1377                          * remove and free it
1378                          */
1379
1380                         if (--res_list_elem->count == 0) {
1381                                 list_del(&res_list_elem->resource_list);
1382                                 kfree(res_list_elem);
1383                         }
1384                         return;
1385                 }
1386         }
1387 }
1388
1389 acpi_status
1390 acpi_os_invalidate_address(
1391     u8                   space_id,
1392     acpi_physical_address   address,
1393     acpi_size               length)
1394 {
1395         struct acpi_res_list res;
1396
1397         switch (space_id) {
1398         case ACPI_ADR_SPACE_SYSTEM_IO:
1399         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1400                 /* Only interference checks against SystemIO and SystemMemory
1401                    are needed */
1402                 res.start = address;
1403                 res.end = address + length - 1;
1404                 res.resource_type = space_id;
1405                 spin_lock(&acpi_res_lock);
1406                 acpi_res_list_del(&res);
1407                 spin_unlock(&acpi_res_lock);
1408                 break;
1409         case ACPI_ADR_SPACE_PCI_CONFIG:
1410         case ACPI_ADR_SPACE_EC:
1411         case ACPI_ADR_SPACE_SMBUS:
1412         case ACPI_ADR_SPACE_CMOS:
1413         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1414         case ACPI_ADR_SPACE_DATA_TABLE:
1415         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1416                 break;
1417         }
1418         return AE_OK;
1419 }
1420
1421 /******************************************************************************
1422  *
1423  * FUNCTION:    acpi_os_validate_address
1424  *
1425  * PARAMETERS:  space_id             - ACPI space ID
1426  *              address             - Physical address
1427  *              length              - Address length
1428  *
1429  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1430  *              should return AE_AML_ILLEGAL_ADDRESS.
1431  *
1432  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1433  *              the addresses accessed by AML operation regions.
1434  *
1435  *****************************************************************************/
1436
1437 acpi_status
1438 acpi_os_validate_address (
1439     u8                   space_id,
1440     acpi_physical_address   address,
1441     acpi_size               length,
1442     char *name)
1443 {
1444         struct acpi_res_list *res;
1445         int added;
1446         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1447                 return AE_OK;
1448
1449         switch (space_id) {
1450         case ACPI_ADR_SPACE_SYSTEM_IO:
1451         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1452                 /* Only interference checks against SystemIO and SystemMemory
1453                    are needed */
1454                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1455                 if (!res)
1456                         return AE_OK;
1457                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1458                 strlcpy(res->name, name, 5);
1459                 res->start = address;
1460                 res->end = address + length - 1;
1461                 res->resource_type = space_id;
1462                 spin_lock(&acpi_res_lock);
1463                 added = acpi_res_list_add(res);
1464                 spin_unlock(&acpi_res_lock);
1465                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1466                          "name: %s\n", added ? "Added" : "Already exist",
1467                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1468                          ? "SystemIO" : "System Memory",
1469                          (unsigned long long)res->start,
1470                          (unsigned long long)res->end,
1471                          res->name);
1472                 if (!added)
1473                         kfree(res);
1474                 break;
1475         case ACPI_ADR_SPACE_PCI_CONFIG:
1476         case ACPI_ADR_SPACE_EC:
1477         case ACPI_ADR_SPACE_SMBUS:
1478         case ACPI_ADR_SPACE_CMOS:
1479         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1480         case ACPI_ADR_SPACE_DATA_TABLE:
1481         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1482                 break;
1483         }
1484         return AE_OK;
1485 }
1486
1487 #endif