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