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 };
  62
  63 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  64 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  65 #endif
  66
  67 #ifdef ENABLE_DEBUGGER
  68 #include <linux/kdb.h>
  69
  70 /* stuff for debugger support */
  71 int acpi_in_debugger;
  72 EXPORT_SYMBOL(acpi_in_debugger);
  73
  74 extern char line_buf[80];
  75 #endif                          /*ENABLE_DEBUGGER */
  76
  77 static unsigned int acpi_irq_irq;
  78 static acpi_osd_handler acpi_irq_handler;
  79 static void *acpi_irq_context;
  80 static struct workqueue_struct *kacpid_wq;
  81 static struct workqueue_struct *kacpi_notify_wq;
  82 static struct workqueue_struct *kacpi_hotplug_wq;
  83
  84 struct acpi_res_list {
  85         resource_size_t start;
  86         resource_size_t end;
  87         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  88         char name[5];   /* only can have a length of 4 chars, make use of this
  89                            one instead of res->name, no need to kalloc then */
  90         struct list_head resource_list;
  91         int count;
  92 };
  93
  94 static LIST_HEAD(resource_list_head);
  95 static DEFINE_SPINLOCK(acpi_res_lock);
  96
  97 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  98 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  99
 100 /*
 101  * The story of _OSI(Linux)
 102  *
 103  * From pre-history through Linux-2.6.22,
 104  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 105  *
 106  * Unfortunately, reference BIOS writers got wind of this
 107  * and put OSI(Linux) in their example code, quickly exposing
 108  * this string as ill-conceived and opening the door to
 109  * an un-bounded number of BIOS incompatibilities.
 110  *
 111  * For example, OSI(Linux) was used on resume to re-POST a
 112  * video card on one system, because Linux at that time
 113  * could not do a speedy restore in its native driver.
 114  * But then upon gaining quick native restore capability,
 115  * Linux has no way to tell the BIOS to skip the time-consuming
 116  * POST -- putting Linux at a permanent performance disadvantage.
 117  * On another system, the BIOS writer used OSI(Linux)
 118  * to infer native OS support for IPMI!  On other systems,
 119  * OSI(Linux) simply got in the way of Linux claiming to
 120  * be compatible with other operating systems, exposing
 121  * BIOS issues such as skipped device initialization.
 122  *
 123  * So "Linux" turned out to be a really poor chose of
 124  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 125  *
 126  * BIOS writers should NOT query _OSI(Linux) on future systems.
 127  * Linux will complain on the console when it sees it, and return FALSE.
 128  * To get Linux to return TRUE for your system  will require
 129  * a kernel source update to add a DMI entry,
 130  * or boot with "acpi_osi=Linux"
 131  */
 132
 133 static struct osi_linux {
 134         unsigned int    enable:1;
 135         unsigned int    dmi:1;
 136         unsigned int    cmdline:1;
 137         unsigned int    known:1;
 138 } osi_linux = { 0, 0, 0, 0};
 139
 140 static void __init acpi_request_region (struct acpi_generic_address *addr,
 141         unsigned int length, char *desc)
 142 {
 143         struct resource *res;
 144
 145         if (!addr->address || !length)
 146                 return;
 147
 148         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 149                 res = request_region(addr->address, length, desc);
 150         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 151                 res = request_mem_region(addr->address, length, desc);
 152 }
 153
 154 static int __init acpi_reserve_resources(void)
 155 {
 156         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 157                 "ACPI PM1a_EVT_BLK");
 158
 159         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 160                 "ACPI PM1b_EVT_BLK");
 161
 162         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 163                 "ACPI PM1a_CNT_BLK");
 164
 165         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 166                 "ACPI PM1b_CNT_BLK");
 167
 168         if (acpi_gbl_FADT.pm_timer_length == 4)
 169                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 170
 171         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 172                 "ACPI PM2_CNT_BLK");
 173
 174         /* Length of GPE blocks must be a non-negative multiple of 2 */
 175
 176         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 177                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 178                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 179
 180         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 181                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 182                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 183
 184         return 0;
 185 }
 186 device_initcall(acpi_reserve_resources);
 187
 188 acpi_status __init acpi_os_initialize(void)
 189 {
 190         return AE_OK;
 191 }
 192
 193 static void bind_to_cpu0(struct work_struct *work)
 194 {
 195         set_cpus_allowed(current, cpumask_of_cpu(0));
 196         kfree(work);
 197 }
 198
 199 static void bind_workqueue(struct workqueue_struct *wq)
 200 {
 201         struct work_struct *work;
 202
 203         work = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
 204         INIT_WORK(work, bind_to_cpu0);
 205         queue_work(wq, work);
 206 }
 207
 208 acpi_status acpi_os_initialize1(void)
 209 {
 210         /*
 211          * On some machines, a software-initiated SMI causes corruption unless
 212          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 213          * typically it's done in GPE-related methods that are run via
 214          * workqueues, so we can avoid the known corruption cases by binding
 215          * the workqueues to CPU 0.
 216          */
 217         kacpid_wq = create_singlethread_workqueue("kacpid");
 218         bind_workqueue(kacpid_wq);
 219         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 220         bind_workqueue(kacpi_notify_wq);
 221         kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
 222         bind_workqueue(kacpi_hotplug_wq);
 223         BUG_ON(!kacpid_wq);
 224         BUG_ON(!kacpi_notify_wq);
 225         BUG_ON(!kacpi_hotplug_wq);
 226         return AE_OK;
 227 }
 228
 229 acpi_status acpi_os_terminate(void)
 230 {
 231         if (acpi_irq_handler) {
 232                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 233                                                  acpi_irq_handler);
 234         }
 235
 236         destroy_workqueue(kacpid_wq);
 237         destroy_workqueue(kacpi_notify_wq);
 238         destroy_workqueue(kacpi_hotplug_wq);
 239
 240         return AE_OK;
 241 }
 242
 243 void acpi_os_printf(const char *fmt, ...)
 244 {
 245         va_list args;
 246         va_start(args, fmt);
 247         acpi_os_vprintf(fmt, args);
 248         va_end(args);
 249 }
 250
 251 void acpi_os_vprintf(const char *fmt, va_list args)
 252 {
 253         static char buffer[512];
 254
 255         vsprintf(buffer, fmt, args);
 256
 257 #ifdef ENABLE_DEBUGGER
 258         if (acpi_in_debugger) {
 259                 kdb_printf("%s", buffer);
 260         } else {
 261                 printk(KERN_CONT "%s", buffer);
 262         }
 263 #else
 264         printk(KERN_CONT "%s", buffer);
 265 #endif
 266 }
 267
 268 acpi_physical_address __init acpi_os_get_root_pointer(void)
 269 {
 270         if (efi_enabled) {
 271                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 272                         return efi.acpi20;
 273                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 274                         return efi.acpi;
 275                 else {
 276                         printk(KERN_ERR PREFIX
 277                                "System description tables not found\n");
 278                         return 0;
 279                 }
 280         } else {
 281                 acpi_physical_address pa = 0;
 282
 283                 acpi_find_root_pointer(&pa);
 284                 return pa;
 285         }
 286 }
 287
 288 void __iomem *__init_refok
 289 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 290 {
 291         if (phys > ULONG_MAX) {
 292                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 293                 return NULL;
 294         }
 295         if (acpi_gbl_permanent_mmap)
 296                 /*
 297                 * ioremap checks to ensure this is in reserved space
 298                 */
 299                 return ioremap((unsigned long)phys, size);
 300         else
 301                 return __acpi_map_table((unsigned long)phys, size);
 302 }
 303 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 304
 305 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 306 {
 307         if (acpi_gbl_permanent_mmap)
 308                 iounmap(virt);
 309         else
 310                 __acpi_unmap_table(virt, size);
 311 }
 312 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 313
 314 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 315 {
 316         if (!acpi_gbl_permanent_mmap)
 317                 __acpi_unmap_table(virt, size);
 318 }
 319
 320 #ifdef ACPI_FUTURE_USAGE
 321 acpi_status
 322 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 323 {
 324         if (!phys || !virt)
 325                 return AE_BAD_PARAMETER;
 326
 327         *phys = virt_to_phys(virt);
 328
 329         return AE_OK;
 330 }
 331 #endif
 332
 333 #define ACPI_MAX_OVERRIDE_LEN 100
 334
 335 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 336
 337 acpi_status
 338 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 339                             acpi_string * new_val)
 340 {
 341         if (!init_val || !new_val)
 342                 return AE_BAD_PARAMETER;
 343
 344         *new_val = NULL;
 345         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 346                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 347                        acpi_os_name);
 348                 *new_val = acpi_os_name;
 349         }
 350
 351         return AE_OK;
 352 }
 353
 354 acpi_status
 355 acpi_os_table_override(struct acpi_table_header * existing_table,
 356                        struct acpi_table_header ** new_table)
 357 {
 358         if (!existing_table || !new_table)
 359                 return AE_BAD_PARAMETER;
 360
 361         *new_table = NULL;
 362
 363 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 364         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 365                 *new_table = (struct acpi_table_header *)AmlCode;
 366 #endif
 367         if (*new_table != NULL) {
 368                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 369                            "this is unsafe: tainting kernel\n",
 370                        existing_table->signature,
 371                        existing_table->oem_table_id);
 372                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 373         }
 374         return AE_OK;
 375 }
 376
 377 static irqreturn_t acpi_irq(int irq, void *dev_id)
 378 {
 379         u32 handled;
 380
 381         handled = (*acpi_irq_handler) (acpi_irq_context);
 382
 383         if (handled) {
 384                 acpi_irq_handled++;
 385                 return IRQ_HANDLED;
 386         } else {
 387                 acpi_irq_not_handled++;
 388                 return IRQ_NONE;
 389         }
 390 }
 391
 392 acpi_status
 393 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 394                                   void *context)
 395 {
 396         unsigned int irq;
 397
 398         acpi_irq_stats_init();
 399
 400         /*
 401          * Ignore the GSI from the core, and use the value in our copy of the
 402          * FADT. It may not be the same if an interrupt source override exists
 403          * for the SCI.
 404          */
 405         gsi = acpi_gbl_FADT.sci_interrupt;
 406         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 407                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 408                        gsi);
 409                 return AE_OK;
 410         }
 411
 412         acpi_irq_handler = handler;
 413         acpi_irq_context = context;
 414         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 415                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 416                 return AE_NOT_ACQUIRED;
 417         }
 418         acpi_irq_irq = irq;
 419
 420         return AE_OK;
 421 }
 422
 423 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 424 {
 425         if (irq) {
 426                 free_irq(irq, acpi_irq);
 427                 acpi_irq_handler = NULL;
 428                 acpi_irq_irq = 0;
 429         }
 430
 431         return AE_OK;
 432 }
 433
 434 /*
 435  * Running in interpreter thread context, safe to sleep
 436  */
 437
 438 void acpi_os_sleep(acpi_integer ms)
 439 {
 440         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 441 }
 442
 443 void acpi_os_stall(u32 us)
 444 {
 445         while (us) {
 446                 u32 delay = 1000;
 447
 448                 if (delay > us)
 449                         delay = us;
 450                 udelay(delay);
 451                 touch_nmi_watchdog();
 452                 us -= delay;
 453         }
 454 }
 455
 456 /*
 457  * Support ACPI 3.0 AML Timer operand
 458  * Returns 64-bit free-running, monotonically increasing timer
 459  * with 100ns granularity
 460  */
 461 u64 acpi_os_get_timer(void)
 462 {
 463         static u64 t;
 464
 465 #ifdef  CONFIG_HPET
 466         /* TBD: use HPET if available */
 467 #endif
 468
 469 #ifdef  CONFIG_X86_PM_TIMER
 470         /* TBD: default to PM timer if HPET was not available */
 471 #endif
 472         if (!t)
 473                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 474
 475         return ++t;
 476 }
 477
 478 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 479 {
 480         u32 dummy;
 481
 482         if (!value)
 483                 value = &dummy;
 484
 485         *value = 0;
 486         if (width <= 8) {
 487                 *(u8 *) value = inb(port);
 488         } else if (width <= 16) {
 489                 *(u16 *) value = inw(port);
 490         } else if (width <= 32) {
 491                 *(u32 *) value = inl(port);
 492         } else {
 493                 BUG();
 494         }
 495
 496         return AE_OK;
 497 }
 498
 499 EXPORT_SYMBOL(acpi_os_read_port);
 500
 501 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 502 {
 503         if (width <= 8) {
 504                 outb(value, port);
 505         } else if (width <= 16) {
 506                 outw(value, port);
 507         } else if (width <= 32) {
 508                 outl(value, port);
 509         } else {
 510                 BUG();
 511         }
 512
 513         return AE_OK;
 514 }
 515
 516 EXPORT_SYMBOL(acpi_os_write_port);
 517
 518 acpi_status
 519 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 520 {
 521         u32 dummy;
 522         void __iomem *virt_addr;
 523
 524         virt_addr = ioremap(phys_addr, width);
 525         if (!value)
 526                 value = &dummy;
 527
 528         switch (width) {
 529         case 8:
 530                 *(u8 *) value = readb(virt_addr);
 531                 break;
 532         case 16:
 533                 *(u16 *) value = readw(virt_addr);
 534                 break;
 535         case 32:
 536                 *(u32 *) value = readl(virt_addr);
 537                 break;
 538         default:
 539                 BUG();
 540         }
 541
 542         iounmap(virt_addr);
 543
 544         return AE_OK;
 545 }
 546
 547 acpi_status
 548 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 549 {
 550         void __iomem *virt_addr;
 551
 552         virt_addr = ioremap(phys_addr, width);
 553
 554         switch (width) {
 555         case 8:
 556                 writeb(value, virt_addr);
 557                 break;
 558         case 16:
 559                 writew(value, virt_addr);
 560                 break;
 561         case 32:
 562                 writel(value, virt_addr);
 563                 break;
 564         default:
 565                 BUG();
 566         }
 567
 568         iounmap(virt_addr);
 569
 570         return AE_OK;
 571 }
 572
 573 acpi_status
 574 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 575                                u32 *value, u32 width)
 576 {
 577         int result, size;
 578
 579         if (!value)
 580                 return AE_BAD_PARAMETER;
 581
 582         switch (width) {
 583         case 8:
 584                 size = 1;
 585                 break;
 586         case 16:
 587                 size = 2;
 588                 break;
 589         case 32:
 590                 size = 4;
 591                 break;
 592         default:
 593                 return AE_ERROR;
 594         }
 595
 596         result = raw_pci_read(pci_id->segment, pci_id->bus,
 597                                 PCI_DEVFN(pci_id->device, pci_id->function),
 598                                 reg, size, value);
 599
 600         return (result ? AE_ERROR : AE_OK);
 601 }
 602
 603 acpi_status
 604 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 605                                 acpi_integer value, u32 width)
 606 {
 607         int result, size;
 608
 609         switch (width) {
 610         case 8:
 611                 size = 1;
 612                 break;
 613         case 16:
 614                 size = 2;
 615                 break;
 616         case 32:
 617                 size = 4;
 618                 break;
 619         default:
 620                 return AE_ERROR;
 621         }
 622
 623         result = raw_pci_write(pci_id->segment, pci_id->bus,
 624                                 PCI_DEVFN(pci_id->device, pci_id->function),
 625                                 reg, size, value);
 626
 627         return (result ? AE_ERROR : AE_OK);
 628 }
 629
 630 /* TODO: Change code to take advantage of driver model more */
 631 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 632                                     acpi_handle chandle,        /* current node */
 633                                     struct acpi_pci_id **id,
 634                                     int *is_bridge, u8 * bus_number)
 635 {
 636         acpi_handle handle;
 637         struct acpi_pci_id *pci_id = *id;
 638         acpi_status status;
 639         unsigned long long temp;
 640         acpi_object_type type;
 641
 642         acpi_get_parent(chandle, &handle);
 643         if (handle != rhandle) {
 644                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 645                                         bus_number);
 646
 647                 status = acpi_get_type(handle, &type);
 648                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 649                         return;
 650
 651                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 652                                           &temp);
 653                 if (ACPI_SUCCESS(status)) {
 654                         u32 val;
 655                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 656                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 657
 658                         if (*is_bridge)
 659                                 pci_id->bus = *bus_number;
 660
 661                         /* any nicer way to get bus number of bridge ? */
 662                         status =
 663                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 664                                                            8);
 665                         if (ACPI_SUCCESS(status)
 666                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 667                                 status =
 668                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 669                                                                    &val, 8);
 670                                 if (!ACPI_SUCCESS(status)) {
 671                                         /* Certainly broken...  FIX ME */
 672                                         return;
 673                                 }
 674                                 *is_bridge = 1;
 675                                 pci_id->bus = val;
 676                                 status =
 677                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 678                                                                    &val, 8);
 679                                 if (ACPI_SUCCESS(status)) {
 680                                         *bus_number = val;
 681                                 }
 682                         } else
 683                                 *is_bridge = 0;
 684                 }
 685         }
 686 }
 687
 688 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 689                            acpi_handle chandle, /* current node */
 690                            struct acpi_pci_id **id)
 691 {
 692         int is_bridge = 1;
 693         u8 bus_number = (*id)->bus;
 694
 695         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 696 }
 697
 698 static void acpi_os_execute_deferred(struct work_struct *work)
 699 {
 700         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 701         if (!dpc) {
 702                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 703                 return;
 704         }
 705
 706         dpc->function(dpc->context);
 707         kfree(dpc);
 708
 709         return;
 710 }
 711
 712 static void acpi_os_execute_hp_deferred(struct work_struct *work)
 713 {
 714         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 715         if (!dpc) {
 716                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 717                 return;
 718         }
 719
 720         acpi_os_wait_events_complete(NULL);
 721
 722         dpc->function(dpc->context);
 723         kfree(dpc);
 724
 725         return;
 726 }
 727
 728 /*******************************************************************************
 729  *
 730  * FUNCTION:    acpi_os_execute
 731  *
 732  * PARAMETERS:  Type               - Type of the callback
 733  *              Function           - Function to be executed
 734  *              Context            - Function parameters
 735  *
 736  * RETURN:      Status
 737  *
 738  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 739  *              immediately executes function on a separate thread.
 740  *
 741  ******************************************************************************/
 742
 743 static acpi_status __acpi_os_execute(acpi_execute_type type,
 744         acpi_osd_exec_callback function, void *context, int hp)
 745 {
 746         acpi_status status = AE_OK;
 747         struct acpi_os_dpc *dpc;
 748         struct workqueue_struct *queue;
 749         work_func_t func;
 750         int ret;
 751         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 752                           "Scheduling function [%p(%p)] for deferred execution.\n",
 753                           function, context));
 754
 755         if (!function)
 756                 return AE_BAD_PARAMETER;
 757
 758         /*
 759          * Allocate/initialize DPC structure.  Note that this memory will be
 760          * freed by the callee.  The kernel handles the work_struct list  in a
 761          * way that allows us to also free its memory inside the callee.
 762          * Because we may want to schedule several tasks with different
 763          * parameters we can't use the approach some kernel code uses of
 764          * having a static work_struct.
 765          */
 766
 767         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 768         if (!dpc)
 769                 return AE_NO_MEMORY;
 770
 771         dpc->function = function;
 772         dpc->context = context;
 773
 774         /*
 775          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 776          * because the hotplug code may call driver .remove() functions,
 777          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 778          * to flush these workqueues.
 779          */
 780         queue = hp ? kacpi_hotplug_wq :
 781                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 782         func = hp ? acpi_os_execute_hp_deferred : acpi_os_execute_deferred;
 783         INIT_WORK(&dpc->work, func);
 784         ret = queue_work(queue, &dpc->work);
 785
 786         if (!ret) {
 787                 printk(KERN_ERR PREFIX
 788                           "Call to queue_work() failed.\n");
 789                 status = AE_ERROR;
 790                 kfree(dpc);
 791         }
 792         return status;
 793 }
 794
 795 acpi_status acpi_os_execute(acpi_execute_type type,
 796                             acpi_osd_exec_callback function, void *context)
 797 {
 798         return __acpi_os_execute(type, function, context, 0);
 799 }
 800 EXPORT_SYMBOL(acpi_os_execute);
 801
 802 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 803         void *context)
 804 {
 805         return __acpi_os_execute(0, function, context, 1);
 806 }
 807
 808 void acpi_os_wait_events_complete(void *context)
 809 {
 810         flush_workqueue(kacpid_wq);
 811         flush_workqueue(kacpi_notify_wq);
 812 }
 813
 814 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 815
 816 /*
 817  * Allocate the memory for a spinlock and initialize it.
 818  */
 819 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 820 {
 821         spin_lock_init(*handle);
 822
 823         return AE_OK;
 824 }
 825
 826 /*
 827  * Deallocate the memory for a spinlock.
 828  */
 829 void acpi_os_delete_lock(acpi_spinlock handle)
 830 {
 831         return;
 832 }
 833
 834 acpi_status
 835 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 836 {
 837         struct semaphore *sem = NULL;
 838
 839         sem = acpi_os_allocate(sizeof(struct semaphore));
 840         if (!sem)
 841                 return AE_NO_MEMORY;
 842         memset(sem, 0, sizeof(struct semaphore));
 843
 844         sema_init(sem, initial_units);
 845
 846         *handle = (acpi_handle *) sem;
 847
 848         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 849                           *handle, initial_units));
 850
 851         return AE_OK;
 852 }
 853
 854 /*
 855  * TODO: A better way to delete semaphores?  Linux doesn't have a
 856  * 'delete_semaphore()' function -- may result in an invalid
 857  * pointer dereference for non-synchronized consumers.  Should
 858  * we at least check for blocked threads and signal/cancel them?
 859  */
 860
 861 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 862 {
 863         struct semaphore *sem = (struct semaphore *)handle;
 864
 865         if (!sem)
 866                 return AE_BAD_PARAMETER;
 867
 868         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 869
 870         BUG_ON(!list_empty(&sem->wait_list));
 871         kfree(sem);
 872         sem = NULL;
 873
 874         return AE_OK;
 875 }
 876
 877 /*
 878  * TODO: Support for units > 1?
 879  */
 880 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 881 {
 882         acpi_status status = AE_OK;
 883         struct semaphore *sem = (struct semaphore *)handle;
 884         long jiffies;
 885         int ret = 0;
 886
 887         if (!sem || (units < 1))
 888                 return AE_BAD_PARAMETER;
 889
 890         if (units > 1)
 891                 return AE_SUPPORT;
 892
 893         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 894                           handle, units, timeout));
 895
 896         if (timeout == ACPI_WAIT_FOREVER)
 897                 jiffies = MAX_SCHEDULE_TIMEOUT;
 898         else
 899                 jiffies = msecs_to_jiffies(timeout);
 900
 901         ret = down_timeout(sem, jiffies);
 902         if (ret)
 903                 status = AE_TIME;
 904
 905         if (ACPI_FAILURE(status)) {
 906                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 907                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 908                                   handle, units, timeout,
 909                                   acpi_format_exception(status)));
 910         } else {
 911                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 912                                   "Acquired semaphore[%p|%d|%d]", handle,
 913                                   units, timeout));
 914         }
 915
 916         return status;
 917 }
 918
 919 /*
 920  * TODO: Support for units > 1?
 921  */
 922 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 923 {
 924         struct semaphore *sem = (struct semaphore *)handle;
 925
 926         if (!sem || (units < 1))
 927                 return AE_BAD_PARAMETER;
 928
 929         if (units > 1)
 930                 return AE_SUPPORT;
 931
 932         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 933                           units));
 934
 935         up(sem);
 936
 937         return AE_OK;
 938 }
 939
 940 #ifdef ACPI_FUTURE_USAGE
 941 u32 acpi_os_get_line(char *buffer)
 942 {
 943
 944 #ifdef ENABLE_DEBUGGER
 945         if (acpi_in_debugger) {
 946                 u32 chars;
 947
 948                 kdb_read(buffer, sizeof(line_buf));
 949
 950                 /* remove the CR kdb includes */
 951                 chars = strlen(buffer) - 1;
 952                 buffer[chars] = '\0';
 953         }
 954 #endif
 955
 956         return 0;
 957 }
 958 #endif                          /*  ACPI_FUTURE_USAGE  */
 959
 960 acpi_status acpi_os_signal(u32 function, void *info)
 961 {
 962         switch (function) {
 963         case ACPI_SIGNAL_FATAL:
 964                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 965                 break;
 966         case ACPI_SIGNAL_BREAKPOINT:
 967                 /*
 968                  * AML Breakpoint
 969                  * ACPI spec. says to treat it as a NOP unless
 970                  * you are debugging.  So if/when we integrate
 971                  * AML debugger into the kernel debugger its
 972                  * hook will go here.  But until then it is
 973                  * not useful to print anything on breakpoints.
 974                  */
 975                 break;
 976         default:
 977                 break;
 978         }
 979
 980         return AE_OK;
 981 }
 982
 983 static int __init acpi_os_name_setup(char *str)
 984 {
 985         char *p = acpi_os_name;
 986         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 987
 988         if (!str || !*str)
 989                 return 0;
 990
 991         for (; count-- && str && *str; str++) {
 992                 if (isalnum(*str) || *str == ' ' || *str == ':')
 993                         *p++ = *str;
 994                 else if (*str == '\'' || *str == '"')
 995                         continue;
 996                 else
 997                         break;
 998         }
 999         *p = 0;
1000
1001         return 1;
1002
1003 }
1004
1005 __setup("acpi_os_name=", acpi_os_name_setup);
1006
1007 static void __init set_osi_linux(unsigned int enable)
1008 {
1009         if (osi_linux.enable != enable) {
1010                 osi_linux.enable = enable;
1011                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1012                         enable ? "Add": "Delet");
1013         }
1014         return;
1015 }
1016
1017 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1018 {
1019         osi_linux.cmdline = 1;  /* cmdline set the default */
1020         set_osi_linux(enable);
1021
1022         return;
1023 }
1024
1025 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1026 {
1027         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1028
1029         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1030
1031         if (enable == -1)
1032                 return;
1033
1034         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1035
1036         set_osi_linux(enable);
1037
1038         return;
1039 }
1040
1041 /*
1042  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1043  *
1044  * empty string disables _OSI
1045  * string starting with '!' disables that string
1046  * otherwise string is added to list, augmenting built-in strings
1047  */
1048 int __init acpi_osi_setup(char *str)
1049 {
1050         if (str == NULL || *str == '\0') {
1051                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1052                 acpi_gbl_create_osi_method = FALSE;
1053         } else if (!strcmp("!Linux", str)) {
1054                 acpi_cmdline_osi_linux(0);      /* !enable */
1055         } else if (*str == '!') {
1056                 if (acpi_osi_invalidate(++str) == AE_OK)
1057                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1058         } else if (!strcmp("Linux", str)) {
1059                 acpi_cmdline_osi_linux(1);      /* enable */
1060         } else if (*osi_additional_string == '\0') {
1061                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1062                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1063         }
1064
1065         return 1;
1066 }
1067
1068 __setup("acpi_osi=", acpi_osi_setup);
1069
1070 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1071 static int __init acpi_serialize_setup(char *str)
1072 {
1073         printk(KERN_INFO PREFIX "serialize enabled\n");
1074
1075         acpi_gbl_all_methods_serialized = TRUE;
1076
1077         return 1;
1078 }
1079
1080 __setup("acpi_serialize", acpi_serialize_setup);
1081
1082 /*
1083  * Wake and Run-Time GPES are expected to be separate.
1084  * We disable wake-GPEs at run-time to prevent spurious
1085  * interrupts.
1086  *
1087  * However, if a system exists that shares Wake and
1088  * Run-time events on the same GPE this flag is available
1089  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1090  */
1091 static int __init acpi_wake_gpes_always_on_setup(char *str)
1092 {
1093         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1094
1095         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1096
1097         return 1;
1098 }
1099
1100 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1101
1102 /* Check of resource interference between native drivers and ACPI
1103  * OperationRegions (SystemIO and System Memory only).
1104  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1105  * in arbitrary AML code and can interfere with legacy drivers.
1106  * acpi_enforce_resources= can be set to:
1107  *
1108  *   - strict (default) (2)
1109  *     -> further driver trying to access the resources will not load
1110  *   - lax              (1)
1111  *     -> further driver trying to access the resources will load, but you
1112  *     get a system message that something might go wrong...
1113  *
1114  *   - no               (0)
1115  *     -> ACPI Operation Region resources will not be registered
1116  *
1117  */
1118 #define ENFORCE_RESOURCES_STRICT 2
1119 #define ENFORCE_RESOURCES_LAX    1
1120 #define ENFORCE_RESOURCES_NO     0
1121
1122 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1123
1124 static int __init acpi_enforce_resources_setup(char *str)
1125 {
1126         if (str == NULL || *str == '\0')
1127                 return 0;
1128
1129         if (!strcmp("strict", str))
1130                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1131         else if (!strcmp("lax", str))
1132                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1133         else if (!strcmp("no", str))
1134                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1135
1136         return 1;
1137 }
1138
1139 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1140
1141 /* Check for resource conflicts between ACPI OperationRegions and native
1142  * drivers */
1143 int acpi_check_resource_conflict(struct resource *res)
1144 {
1145         struct acpi_res_list *res_list_elem;
1146         int ioport;
1147         int clash = 0;
1148
1149         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1150                 return 0;
1151         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1152                 return 0;
1153
1154         ioport = res->flags & IORESOURCE_IO;
1155
1156         spin_lock(&acpi_res_lock);
1157         list_for_each_entry(res_list_elem, &resource_list_head,
1158                             resource_list) {
1159                 if (ioport && (res_list_elem->resource_type
1160                                != ACPI_ADR_SPACE_SYSTEM_IO))
1161                         continue;
1162                 if (!ioport && (res_list_elem->resource_type
1163                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1164                         continue;
1165
1166                 if (res->end < res_list_elem->start
1167                     || res_list_elem->end < res->start)
1168                         continue;
1169                 clash = 1;
1170                 break;
1171         }
1172         spin_unlock(&acpi_res_lock);
1173
1174         if (clash) {
1175                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1176                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1177                                " conflicts with ACPI region %s"
1178                                " [0x%llx-0x%llx]\n",
1179                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1180                                ? KERN_WARNING : KERN_ERR,
1181                                ioport ? "I/O" : "Memory", res->name,
1182                                (long long) res->start, (long long) res->end,
1183                                res_list_elem->name,
1184                                (long long) res_list_elem->start,
1185                                (long long) res_list_elem->end);
1186                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1187                 }
1188                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1189                         return -EBUSY;
1190         }
1191         return 0;
1192 }
1193 EXPORT_SYMBOL(acpi_check_resource_conflict);
1194
1195 int acpi_check_region(resource_size_t start, resource_size_t n,
1196                       const char *name)
1197 {
1198         struct resource res = {
1199                 .start = start,
1200                 .end   = start + n - 1,
1201                 .name  = name,
1202                 .flags = IORESOURCE_IO,
1203         };
1204
1205         return acpi_check_resource_conflict(&res);
1206 }
1207 EXPORT_SYMBOL(acpi_check_region);
1208
1209 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1210                       const char *name)
1211 {
1212         struct resource res = {
1213                 .start = start,
1214                 .end   = start + n - 1,
1215                 .name  = name,
1216                 .flags = IORESOURCE_MEM,
1217         };
1218
1219         return acpi_check_resource_conflict(&res);
1220
1221 }
1222 EXPORT_SYMBOL(acpi_check_mem_region);
1223
1224 /*
1225  * Acquire a spinlock.
1226  *
1227  * handle is a pointer to the spinlock_t.
1228  */
1229
1230 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1231 {
1232         acpi_cpu_flags flags;
1233         spin_lock_irqsave(lockp, flags);
1234         return flags;
1235 }
1236
1237 /*
1238  * Release a spinlock. See above.
1239  */
1240
1241 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1242 {
1243         spin_unlock_irqrestore(lockp, flags);
1244 }
1245
1246 #ifndef ACPI_USE_LOCAL_CACHE
1247
1248 /*******************************************************************************
1249  *
1250  * FUNCTION:    acpi_os_create_cache
1251  *
1252  * PARAMETERS:  name      - Ascii name for the cache
1253  *              size      - Size of each cached object
1254  *              depth     - Maximum depth of the cache (in objects) <ignored>
1255  *              cache     - Where the new cache object is returned
1256  *
1257  * RETURN:      status
1258  *
1259  * DESCRIPTION: Create a cache object
1260  *
1261  ******************************************************************************/
1262
1263 acpi_status
1264 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1265 {
1266         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1267         if (*cache == NULL)
1268                 return AE_ERROR;
1269         else
1270                 return AE_OK;
1271 }
1272
1273 /*******************************************************************************
1274  *
1275  * FUNCTION:    acpi_os_purge_cache
1276  *
1277  * PARAMETERS:  Cache           - Handle to cache object
1278  *
1279  * RETURN:      Status
1280  *
1281  * DESCRIPTION: Free all objects within the requested cache.
1282  *
1283  ******************************************************************************/
1284
1285 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1286 {
1287         kmem_cache_shrink(cache);
1288         return (AE_OK);
1289 }
1290
1291 /*******************************************************************************
1292  *
1293  * FUNCTION:    acpi_os_delete_cache
1294  *
1295  * PARAMETERS:  Cache           - Handle to cache object
1296  *
1297  * RETURN:      Status
1298  *
1299  * DESCRIPTION: Free all objects within the requested cache and delete the
1300  *              cache object.
1301  *
1302  ******************************************************************************/
1303
1304 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1305 {
1306         kmem_cache_destroy(cache);
1307         return (AE_OK);
1308 }
1309
1310 /*******************************************************************************
1311  *
1312  * FUNCTION:    acpi_os_release_object
1313  *
1314  * PARAMETERS:  Cache       - Handle to cache object
1315  *              Object      - The object to be released
1316  *
1317  * RETURN:      None
1318  *
1319  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1320  *              the object is deleted.
1321  *
1322  ******************************************************************************/
1323
1324 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1325 {
1326         kmem_cache_free(cache, object);
1327         return (AE_OK);
1328 }
1329
1330 /******************************************************************************
1331  *
1332  * FUNCTION:    acpi_os_validate_interface
1333  *
1334  * PARAMETERS:  interface           - Requested interface to be validated
1335  *
1336  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1337  *
1338  * DESCRIPTION: Match an interface string to the interfaces supported by the
1339  *              host. Strings originate from an AML call to the _OSI method.
1340  *
1341  *****************************************************************************/
1342
1343 acpi_status
1344 acpi_os_validate_interface (char *interface)
1345 {
1346         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1347                 return AE_OK;
1348         if (!strcmp("Linux", interface)) {
1349
1350                 printk(KERN_NOTICE PREFIX
1351                         "BIOS _OSI(Linux) query %s%s\n",
1352                         osi_linux.enable ? "honored" : "ignored",
1353                         osi_linux.cmdline ? " via cmdline" :
1354                         osi_linux.dmi ? " via DMI" : "");
1355
1356                 if (osi_linux.enable)
1357                         return AE_OK;
1358         }
1359         return AE_SUPPORT;
1360 }
1361
1362 static inline int acpi_res_list_add(struct acpi_res_list *res)
1363 {
1364         struct acpi_res_list *res_list_elem;
1365
1366         list_for_each_entry(res_list_elem, &resource_list_head,
1367                             resource_list) {
1368
1369                 if (res->resource_type == res_list_elem->resource_type &&
1370                     res->start == res_list_elem->start &&
1371                     res->end == res_list_elem->end) {
1372
1373                         /*
1374                          * The Region(addr,len) already exist in the list,
1375                          * just increase the count
1376                          */
1377
1378                         res_list_elem->count++;
1379                         return 0;
1380                 }
1381         }
1382
1383         res->count = 1;
1384         list_add(&res->resource_list, &resource_list_head);
1385         return 1;
1386 }
1387
1388 static inline void acpi_res_list_del(struct acpi_res_list *res)
1389 {
1390         struct acpi_res_list *res_list_elem;
1391
1392         list_for_each_entry(res_list_elem, &resource_list_head,
1393                             resource_list) {
1394
1395                 if (res->resource_type == res_list_elem->resource_type &&
1396                     res->start == res_list_elem->start &&
1397                     res->end == res_list_elem->end) {
1398
1399                         /*
1400                          * If the res count is decreased to 0,
1401                          * remove and free it
1402                          */
1403
1404                         if (--res_list_elem->count == 0) {
1405                                 list_del(&res_list_elem->resource_list);
1406                                 kfree(res_list_elem);
1407                         }
1408                         return;
1409                 }
1410         }
1411 }
1412
1413 acpi_status
1414 acpi_os_invalidate_address(
1415     u8                   space_id,
1416     acpi_physical_address   address,
1417     acpi_size               length)
1418 {
1419         struct acpi_res_list res;
1420
1421         switch (space_id) {
1422         case ACPI_ADR_SPACE_SYSTEM_IO:
1423         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1424                 /* Only interference checks against SystemIO and SytemMemory
1425                    are needed */
1426                 res.start = address;
1427                 res.end = address + length - 1;
1428                 res.resource_type = space_id;
1429                 spin_lock(&acpi_res_lock);
1430                 acpi_res_list_del(&res);
1431                 spin_unlock(&acpi_res_lock);
1432                 break;
1433         case ACPI_ADR_SPACE_PCI_CONFIG:
1434         case ACPI_ADR_SPACE_EC:
1435         case ACPI_ADR_SPACE_SMBUS:
1436         case ACPI_ADR_SPACE_CMOS:
1437         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1438         case ACPI_ADR_SPACE_DATA_TABLE:
1439         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1440                 break;
1441         }
1442         return AE_OK;
1443 }
1444
1445 /******************************************************************************
1446  *
1447  * FUNCTION:    acpi_os_validate_address
1448  *
1449  * PARAMETERS:  space_id             - ACPI space ID
1450  *              address             - Physical address
1451  *              length              - Address length
1452  *
1453  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1454  *              should return AE_AML_ILLEGAL_ADDRESS.
1455  *
1456  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1457  *              the addresses accessed by AML operation regions.
1458  *
1459  *****************************************************************************/
1460
1461 acpi_status
1462 acpi_os_validate_address (
1463     u8                   space_id,
1464     acpi_physical_address   address,
1465     acpi_size               length,
1466     char *name)
1467 {
1468         struct acpi_res_list *res;
1469         int added;
1470         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1471                 return AE_OK;
1472
1473         switch (space_id) {
1474         case ACPI_ADR_SPACE_SYSTEM_IO:
1475         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1476                 /* Only interference checks against SystemIO and SytemMemory
1477                    are needed */
1478                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1479                 if (!res)
1480                         return AE_OK;
1481                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1482                 strlcpy(res->name, name, 5);
1483                 res->start = address;
1484                 res->end = address + length - 1;
1485                 res->resource_type = space_id;
1486                 spin_lock(&acpi_res_lock);
1487                 added = acpi_res_list_add(res);
1488                 spin_unlock(&acpi_res_lock);
1489                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1490                          "name: %s\n", added ? "Added" : "Already exist",
1491                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1492                          ? "SystemIO" : "System Memory",
1493                          (unsigned long long)res->start,
1494                          (unsigned long long)res->end,
1495                          res->name);
1496                 if (!added)
1497                         kfree(res);
1498                 break;
1499         case ACPI_ADR_SPACE_PCI_CONFIG:
1500         case ACPI_ADR_SPACE_EC:
1501         case ACPI_ADR_SPACE_SMBUS:
1502         case ACPI_ADR_SPACE_CMOS:
1503         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1504         case ACPI_ADR_SPACE_DATA_TABLE:
1505         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1506                 break;
1507         }
1508         return AE_OK;
1509 }
1510
1511 #endif