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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  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl");
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54         struct work_struct work;
  55 };
  56
  57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  59 #endif
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67
  68 extern char line_buf[80];
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 /*
  81  * "Ode to _OSI(Linux)"
  82  *
  83  * osi_linux -- Control response to BIOS _OSI(Linux) query.
  84  *
  85  * As Linux evolves, the features that it supports change.
  86  * So an OSI string such as "Linux" is not specific enough
  87  * to be useful across multiple versions of Linux.  It
  88  * doesn't identify any particular feature, interface,
  89  * or even any particular version of Linux...
  90  *
  91  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
  92  * to a BIOS _OSI(Linux) query.  When
  93  * a reference mobile BIOS started using it, its use
  94  * started to spread to many vendor platforms.
  95  * As it is not supportable, we need to halt that spread.
  96  *
  97  * Today, most BIOS references to _OSI(Linux) are noise --
  98  * they have no functional effect and are just dead code
  99  * carried over from the reference BIOS.
 100  *
 101  * The next most common case is that _OSI(Linux) harms Linux,
 102  * usually by causing the BIOS to follow paths that are
 103  * not tested during Windows validation.
 104  *
 105  * Finally, there is a short list of platforms
 106  * where OSI(Linux) benefits Linux.
 107  *
 108  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 109  * DMI is used to disable the dmesg warning about OSI(Linux)
 110  * on platforms where it is known to have no effect.
 111  * But a dmesg warning remains for systems where
 112  * we do not know if OSI(Linux) is good or bad for the system.
 113  * DMI is also used to enable OSI(Linux) for the machines
 114  * that are known to need it.
 115  *
 116  * BIOS writers should NOT query _OSI(Linux) on future systems.
 117  * It will be ignored by default, and to get Linux to
 118  * not ignore it will require a kernel source update to
 119  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 120  */
 121 #define OSI_LINUX_ENABLE 0
 122
 123 struct osi_linux {
 124         unsigned int    enable:1;
 125         unsigned int    dmi:1;
 126         unsigned int    cmdline:1;
 127         unsigned int    known:1;
 128 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 129
 130 static void __init acpi_request_region (struct acpi_generic_address *addr,
 131         unsigned int length, char *desc)
 132 {
 133         struct resource *res;
 134
 135         if (!addr->address || !length)
 136                 return;
 137
 138         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 139                 res = request_region(addr->address, length, desc);
 140         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 141                 res = request_mem_region(addr->address, length, desc);
 142 }
 143
 144 static int __init acpi_reserve_resources(void)
 145 {
 146         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 147                 "ACPI PM1a_EVT_BLK");
 148
 149         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 150                 "ACPI PM1b_EVT_BLK");
 151
 152         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 153                 "ACPI PM1a_CNT_BLK");
 154
 155         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 156                 "ACPI PM1b_CNT_BLK");
 157
 158         if (acpi_gbl_FADT.pm_timer_length == 4)
 159                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 160
 161         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 162                 "ACPI PM2_CNT_BLK");
 163
 164         /* Length of GPE blocks must be a non-negative multiple of 2 */
 165
 166         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 167                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 168                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 169
 170         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 171                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 172                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 173
 174         return 0;
 175 }
 176 device_initcall(acpi_reserve_resources);
 177
 178 acpi_status __init acpi_os_initialize(void)
 179 {
 180         return AE_OK;
 181 }
 182
 183 acpi_status acpi_os_initialize1(void)
 184 {
 185         /*
 186          * Initialize PCI configuration space access, as we'll need to access
 187          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 188          */
 189         if (!raw_pci_ops) {
 190                 printk(KERN_ERR PREFIX
 191                        "Access to PCI configuration space unavailable\n");
 192                 return AE_NULL_ENTRY;
 193         }
 194         kacpid_wq = create_singlethread_workqueue("kacpid");
 195         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 196         BUG_ON(!kacpid_wq);
 197         BUG_ON(!kacpi_notify_wq);
 198         return AE_OK;
 199 }
 200
 201 acpi_status acpi_os_terminate(void)
 202 {
 203         if (acpi_irq_handler) {
 204                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 205                                                  acpi_irq_handler);
 206         }
 207
 208         destroy_workqueue(kacpid_wq);
 209         destroy_workqueue(kacpi_notify_wq);
 210
 211         return AE_OK;
 212 }
 213
 214 void acpi_os_printf(const char *fmt, ...)
 215 {
 216         va_list args;
 217         va_start(args, fmt);
 218         acpi_os_vprintf(fmt, args);
 219         va_end(args);
 220 }
 221
 222 EXPORT_SYMBOL(acpi_os_printf);
 223
 224 void acpi_os_vprintf(const char *fmt, va_list args)
 225 {
 226         static char buffer[512];
 227
 228         vsprintf(buffer, fmt, args);
 229
 230 #ifdef ENABLE_DEBUGGER
 231         if (acpi_in_debugger) {
 232                 kdb_printf("%s", buffer);
 233         } else {
 234                 printk("%s", buffer);
 235         }
 236 #else
 237         printk("%s", buffer);
 238 #endif
 239 }
 240
 241 acpi_physical_address __init acpi_os_get_root_pointer(void)
 242 {
 243         if (efi_enabled) {
 244                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 245                         return efi.acpi20;
 246                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 247                         return efi.acpi;
 248                 else {
 249                         printk(KERN_ERR PREFIX
 250                                "System description tables not found\n");
 251                         return 0;
 252                 }
 253         } else
 254                 return acpi_find_rsdp();
 255 }
 256
 257 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 258 {
 259         if (phys > ULONG_MAX) {
 260                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 261                 return NULL;
 262         }
 263         if (acpi_gbl_permanent_mmap)
 264                 /*
 265                 * ioremap checks to ensure this is in reserved space
 266                 */
 267                 return ioremap((unsigned long)phys, size);
 268         else
 269                 return __acpi_map_table((unsigned long)phys, size);
 270 }
 271 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 272
 273 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 274 {
 275         if (acpi_gbl_permanent_mmap) {
 276                 iounmap(virt);
 277         }
 278 }
 279 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 280
 281 #ifdef ACPI_FUTURE_USAGE
 282 acpi_status
 283 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 284 {
 285         if (!phys || !virt)
 286                 return AE_BAD_PARAMETER;
 287
 288         *phys = virt_to_phys(virt);
 289
 290         return AE_OK;
 291 }
 292 #endif
 293
 294 #define ACPI_MAX_OVERRIDE_LEN 100
 295
 296 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 297
 298 acpi_status
 299 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 300                             acpi_string * new_val)
 301 {
 302         if (!init_val || !new_val)
 303                 return AE_BAD_PARAMETER;
 304
 305         *new_val = NULL;
 306         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 307                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 308                        acpi_os_name);
 309                 *new_val = acpi_os_name;
 310         }
 311
 312         return AE_OK;
 313 }
 314
 315 acpi_status
 316 acpi_os_table_override(struct acpi_table_header * existing_table,
 317                        struct acpi_table_header ** new_table)
 318 {
 319         if (!existing_table || !new_table)
 320                 return AE_BAD_PARAMETER;
 321
 322 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 323         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 324                 *new_table = (struct acpi_table_header *)AmlCode;
 325         else
 326                 *new_table = NULL;
 327 #else
 328         *new_table = NULL;
 329 #endif
 330         return AE_OK;
 331 }
 332
 333 static irqreturn_t acpi_irq(int irq, void *dev_id)
 334 {
 335         u32 handled;
 336
 337         handled = (*acpi_irq_handler) (acpi_irq_context);
 338
 339         if (handled) {
 340                 acpi_irq_handled++;
 341                 return IRQ_HANDLED;
 342         } else
 343                 return IRQ_NONE;
 344 }
 345
 346 acpi_status
 347 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 348                                   void *context)
 349 {
 350         unsigned int irq;
 351
 352         acpi_irq_stats_init();
 353
 354         /*
 355          * Ignore the GSI from the core, and use the value in our copy of the
 356          * FADT. It may not be the same if an interrupt source override exists
 357          * for the SCI.
 358          */
 359         gsi = acpi_gbl_FADT.sci_interrupt;
 360         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 361                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 362                        gsi);
 363                 return AE_OK;
 364         }
 365
 366         acpi_irq_handler = handler;
 367         acpi_irq_context = context;
 368         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 369                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 370                 return AE_NOT_ACQUIRED;
 371         }
 372         acpi_irq_irq = irq;
 373
 374         return AE_OK;
 375 }
 376
 377 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 378 {
 379         if (irq) {
 380                 free_irq(irq, acpi_irq);
 381                 acpi_irq_handler = NULL;
 382                 acpi_irq_irq = 0;
 383         }
 384
 385         return AE_OK;
 386 }
 387
 388 /*
 389  * Running in interpreter thread context, safe to sleep
 390  */
 391
 392 void acpi_os_sleep(acpi_integer ms)
 393 {
 394         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 395 }
 396
 397 EXPORT_SYMBOL(acpi_os_sleep);
 398
 399 void acpi_os_stall(u32 us)
 400 {
 401         while (us) {
 402                 u32 delay = 1000;
 403
 404                 if (delay > us)
 405                         delay = us;
 406                 udelay(delay);
 407                 touch_nmi_watchdog();
 408                 us -= delay;
 409         }
 410 }
 411
 412 EXPORT_SYMBOL(acpi_os_stall);
 413
 414 /*
 415  * Support ACPI 3.0 AML Timer operand
 416  * Returns 64-bit free-running, monotonically increasing timer
 417  * with 100ns granularity
 418  */
 419 u64 acpi_os_get_timer(void)
 420 {
 421         static u64 t;
 422
 423 #ifdef  CONFIG_HPET
 424         /* TBD: use HPET if available */
 425 #endif
 426
 427 #ifdef  CONFIG_X86_PM_TIMER
 428         /* TBD: default to PM timer if HPET was not available */
 429 #endif
 430         if (!t)
 431                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 432
 433         return ++t;
 434 }
 435
 436 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 437 {
 438         u32 dummy;
 439
 440         if (!value)
 441                 value = &dummy;
 442
 443         *value = 0;
 444         if (width <= 8) {
 445                 *(u8 *) value = inb(port);
 446         } else if (width <= 16) {
 447                 *(u16 *) value = inw(port);
 448         } else if (width <= 32) {
 449                 *(u32 *) value = inl(port);
 450         } else {
 451                 BUG();
 452         }
 453
 454         return AE_OK;
 455 }
 456
 457 EXPORT_SYMBOL(acpi_os_read_port);
 458
 459 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 460 {
 461         if (width <= 8) {
 462                 outb(value, port);
 463         } else if (width <= 16) {
 464                 outw(value, port);
 465         } else if (width <= 32) {
 466                 outl(value, port);
 467         } else {
 468                 BUG();
 469         }
 470
 471         return AE_OK;
 472 }
 473
 474 EXPORT_SYMBOL(acpi_os_write_port);
 475
 476 acpi_status
 477 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 478 {
 479         u32 dummy;
 480         void __iomem *virt_addr;
 481
 482         virt_addr = ioremap(phys_addr, width);
 483         if (!value)
 484                 value = &dummy;
 485
 486         switch (width) {
 487         case 8:
 488                 *(u8 *) value = readb(virt_addr);
 489                 break;
 490         case 16:
 491                 *(u16 *) value = readw(virt_addr);
 492                 break;
 493         case 32:
 494                 *(u32 *) value = readl(virt_addr);
 495                 break;
 496         default:
 497                 BUG();
 498         }
 499
 500         iounmap(virt_addr);
 501
 502         return AE_OK;
 503 }
 504
 505 acpi_status
 506 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 507 {
 508         void __iomem *virt_addr;
 509
 510         virt_addr = ioremap(phys_addr, width);
 511
 512         switch (width) {
 513         case 8:
 514                 writeb(value, virt_addr);
 515                 break;
 516         case 16:
 517                 writew(value, virt_addr);
 518                 break;
 519         case 32:
 520                 writel(value, virt_addr);
 521                 break;
 522         default:
 523                 BUG();
 524         }
 525
 526         iounmap(virt_addr);
 527
 528         return AE_OK;
 529 }
 530
 531 acpi_status
 532 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 533                                void *value, u32 width)
 534 {
 535         int result, size;
 536
 537         if (!value)
 538                 return AE_BAD_PARAMETER;
 539
 540         switch (width) {
 541         case 8:
 542                 size = 1;
 543                 break;
 544         case 16:
 545                 size = 2;
 546                 break;
 547         case 32:
 548                 size = 4;
 549                 break;
 550         default:
 551                 return AE_ERROR;
 552         }
 553
 554         BUG_ON(!raw_pci_ops);
 555
 556         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 557                                    PCI_DEVFN(pci_id->device, pci_id->function),
 558                                    reg, size, value);
 559
 560         return (result ? AE_ERROR : AE_OK);
 561 }
 562
 563 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 564
 565 acpi_status
 566 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 567                                 acpi_integer value, u32 width)
 568 {
 569         int result, size;
 570
 571         switch (width) {
 572         case 8:
 573                 size = 1;
 574                 break;
 575         case 16:
 576                 size = 2;
 577                 break;
 578         case 32:
 579                 size = 4;
 580                 break;
 581         default:
 582                 return AE_ERROR;
 583         }
 584
 585         BUG_ON(!raw_pci_ops);
 586
 587         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 588                                     PCI_DEVFN(pci_id->device, pci_id->function),
 589                                     reg, size, value);
 590
 591         return (result ? AE_ERROR : AE_OK);
 592 }
 593
 594 /* TODO: Change code to take advantage of driver model more */
 595 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 596                                     acpi_handle chandle,        /* current node */
 597                                     struct acpi_pci_id **id,
 598                                     int *is_bridge, u8 * bus_number)
 599 {
 600         acpi_handle handle;
 601         struct acpi_pci_id *pci_id = *id;
 602         acpi_status status;
 603         unsigned long temp;
 604         acpi_object_type type;
 605         u8 tu8;
 606
 607         acpi_get_parent(chandle, &handle);
 608         if (handle != rhandle) {
 609                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 610                                         bus_number);
 611
 612                 status = acpi_get_type(handle, &type);
 613                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 614                         return;
 615
 616                 status =
 617                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 618                                           &temp);
 619                 if (ACPI_SUCCESS(status)) {
 620                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 621                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 622
 623                         if (*is_bridge)
 624                                 pci_id->bus = *bus_number;
 625
 626                         /* any nicer way to get bus number of bridge ? */
 627                         status =
 628                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 629                                                            8);
 630                         if (ACPI_SUCCESS(status)
 631                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 632                                 status =
 633                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 634                                                                    &tu8, 8);
 635                                 if (!ACPI_SUCCESS(status)) {
 636                                         /* Certainly broken...  FIX ME */
 637                                         return;
 638                                 }
 639                                 *is_bridge = 1;
 640                                 pci_id->bus = tu8;
 641                                 status =
 642                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 643                                                                    &tu8, 8);
 644                                 if (ACPI_SUCCESS(status)) {
 645                                         *bus_number = tu8;
 646                                 }
 647                         } else
 648                                 *is_bridge = 0;
 649                 }
 650         }
 651 }
 652
 653 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 654                            acpi_handle chandle, /* current node */
 655                            struct acpi_pci_id **id)
 656 {
 657         int is_bridge = 1;
 658         u8 bus_number = (*id)->bus;
 659
 660         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 661 }
 662
 663 static void acpi_os_execute_deferred(struct work_struct *work)
 664 {
 665         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 666         if (!dpc) {
 667                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 668                 return;
 669         }
 670
 671         dpc->function(dpc->context);
 672         kfree(dpc);
 673
 674         /* Yield cpu to notify thread */
 675         cond_resched();
 676
 677         return;
 678 }
 679
 680 static void acpi_os_execute_notify(struct work_struct *work)
 681 {
 682         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 683
 684         if (!dpc) {
 685                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 686                 return;
 687         }
 688
 689         dpc->function(dpc->context);
 690
 691         kfree(dpc);
 692
 693         return;
 694 }
 695
 696 /*******************************************************************************
 697  *
 698  * FUNCTION:    acpi_os_execute
 699  *
 700  * PARAMETERS:  Type               - Type of the callback
 701  *              Function           - Function to be executed
 702  *              Context            - Function parameters
 703  *
 704  * RETURN:      Status
 705  *
 706  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 707  *              immediately executes function on a separate thread.
 708  *
 709  ******************************************************************************/
 710
 711 acpi_status acpi_os_execute(acpi_execute_type type,
 712                             acpi_osd_exec_callback function, void *context)
 713 {
 714         acpi_status status = AE_OK;
 715         struct acpi_os_dpc *dpc;
 716
 717         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 718                           "Scheduling function [%p(%p)] for deferred execution.\n",
 719                           function, context));
 720
 721         if (!function)
 722                 return AE_BAD_PARAMETER;
 723
 724         /*
 725          * Allocate/initialize DPC structure.  Note that this memory will be
 726          * freed by the callee.  The kernel handles the work_struct list  in a
 727          * way that allows us to also free its memory inside the callee.
 728          * Because we may want to schedule several tasks with different
 729          * parameters we can't use the approach some kernel code uses of
 730          * having a static work_struct.
 731          */
 732
 733         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 734         if (!dpc)
 735                 return_ACPI_STATUS(AE_NO_MEMORY);
 736
 737         dpc->function = function;
 738         dpc->context = context;
 739
 740         if (type == OSL_NOTIFY_HANDLER) {
 741                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 742                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 743                         status = AE_ERROR;
 744                         kfree(dpc);
 745                 }
 746         } else {
 747                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 748                 if (!queue_work(kacpid_wq, &dpc->work)) {
 749                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 750                                   "Call to queue_work() failed.\n"));
 751                         status = AE_ERROR;
 752                         kfree(dpc);
 753                 }
 754         }
 755         return_ACPI_STATUS(status);
 756 }
 757
 758 EXPORT_SYMBOL(acpi_os_execute);
 759
 760 void acpi_os_wait_events_complete(void *context)
 761 {
 762         flush_workqueue(kacpid_wq);
 763 }
 764
 765 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 766
 767 /*
 768  * Allocate the memory for a spinlock and initialize it.
 769  */
 770 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 771 {
 772         spin_lock_init(*handle);
 773
 774         return AE_OK;
 775 }
 776
 777 /*
 778  * Deallocate the memory for a spinlock.
 779  */
 780 void acpi_os_delete_lock(acpi_spinlock handle)
 781 {
 782         return;
 783 }
 784
 785 acpi_status
 786 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 787 {
 788         struct semaphore *sem = NULL;
 789
 790
 791         sem = acpi_os_allocate(sizeof(struct semaphore));
 792         if (!sem)
 793                 return AE_NO_MEMORY;
 794         memset(sem, 0, sizeof(struct semaphore));
 795
 796         sema_init(sem, initial_units);
 797
 798         *handle = (acpi_handle *) sem;
 799
 800         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 801                           *handle, initial_units));
 802
 803         return AE_OK;
 804 }
 805
 806 EXPORT_SYMBOL(acpi_os_create_semaphore);
 807
 808 /*
 809  * TODO: A better way to delete semaphores?  Linux doesn't have a
 810  * 'delete_semaphore()' function -- may result in an invalid
 811  * pointer dereference for non-synchronized consumers.  Should
 812  * we at least check for blocked threads and signal/cancel them?
 813  */
 814
 815 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 816 {
 817         struct semaphore *sem = (struct semaphore *)handle;
 818
 819
 820         if (!sem)
 821                 return AE_BAD_PARAMETER;
 822
 823         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 824
 825         kfree(sem);
 826         sem = NULL;
 827
 828         return AE_OK;
 829 }
 830
 831 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 832
 833 /*
 834  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 835  * improvise.  The process is to sleep for one scheduler quantum
 836  * until the semaphore becomes available.  Downside is that this
 837  * may result in starvation for timeout-based waits when there's
 838  * lots of semaphore activity.
 839  *
 840  * TODO: Support for units > 1?
 841  */
 842 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 843 {
 844         acpi_status status = AE_OK;
 845         struct semaphore *sem = (struct semaphore *)handle;
 846         int ret = 0;
 847
 848
 849         if (!sem || (units < 1))
 850                 return AE_BAD_PARAMETER;
 851
 852         if (units > 1)
 853                 return AE_SUPPORT;
 854
 855         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 856                           handle, units, timeout));
 857
 858         /*
 859          * This can be called during resume with interrupts off.
 860          * Like boot-time, we should be single threaded and will
 861          * always get the lock if we try -- timeout or not.
 862          * If this doesn't succeed, then we will oops courtesy of
 863          * might_sleep() in down().
 864          */
 865         if (!down_trylock(sem))
 866                 return AE_OK;
 867
 868         switch (timeout) {
 869                 /*
 870                  * No Wait:
 871                  * --------
 872                  * A zero timeout value indicates that we shouldn't wait - just
 873                  * acquire the semaphore if available otherwise return AE_TIME
 874                  * (a.k.a. 'would block').
 875                  */
 876         case 0:
 877                 if (down_trylock(sem))
 878                         status = AE_TIME;
 879                 break;
 880
 881                 /*
 882                  * Wait Indefinitely:
 883                  * ------------------
 884                  */
 885         case ACPI_WAIT_FOREVER:
 886                 down(sem);
 887                 break;
 888
 889                 /*
 890                  * Wait w/ Timeout:
 891                  * ----------------
 892                  */
 893         default:
 894                 // TODO: A better timeout algorithm?
 895                 {
 896                         int i = 0;
 897                         static const int quantum_ms = 1000 / HZ;
 898
 899                         ret = down_trylock(sem);
 900                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 901                                 schedule_timeout_interruptible(1);
 902                                 ret = down_trylock(sem);
 903                         }
 904
 905                         if (ret != 0)
 906                                 status = AE_TIME;
 907                 }
 908                 break;
 909         }
 910
 911         if (ACPI_FAILURE(status)) {
 912                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 913                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 914                                   handle, units, timeout,
 915                                   acpi_format_exception(status)));
 916         } else {
 917                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 918                                   "Acquired semaphore[%p|%d|%d]", handle,
 919                                   units, timeout));
 920         }
 921
 922         return status;
 923 }
 924
 925 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 926
 927 /*
 928  * TODO: Support for units > 1?
 929  */
 930 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 931 {
 932         struct semaphore *sem = (struct semaphore *)handle;
 933
 934
 935         if (!sem || (units < 1))
 936                 return AE_BAD_PARAMETER;
 937
 938         if (units > 1)
 939                 return AE_SUPPORT;
 940
 941         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 942                           units));
 943
 944         up(sem);
 945
 946         return AE_OK;
 947 }
 948
 949 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 950
 951 #ifdef ACPI_FUTURE_USAGE
 952 u32 acpi_os_get_line(char *buffer)
 953 {
 954
 955 #ifdef ENABLE_DEBUGGER
 956         if (acpi_in_debugger) {
 957                 u32 chars;
 958
 959                 kdb_read(buffer, sizeof(line_buf));
 960
 961                 /* remove the CR kdb includes */
 962                 chars = strlen(buffer) - 1;
 963                 buffer[chars] = '\0';
 964         }
 965 #endif
 966
 967         return 0;
 968 }
 969 #endif                          /*  ACPI_FUTURE_USAGE  */
 970
 971 acpi_status acpi_os_signal(u32 function, void *info)
 972 {
 973         switch (function) {
 974         case ACPI_SIGNAL_FATAL:
 975                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 976                 break;
 977         case ACPI_SIGNAL_BREAKPOINT:
 978                 /*
 979                  * AML Breakpoint
 980                  * ACPI spec. says to treat it as a NOP unless
 981                  * you are debugging.  So if/when we integrate
 982                  * AML debugger into the kernel debugger its
 983                  * hook will go here.  But until then it is
 984                  * not useful to print anything on breakpoints.
 985                  */
 986                 break;
 987         default:
 988                 break;
 989         }
 990
 991         return AE_OK;
 992 }
 993
 994 EXPORT_SYMBOL(acpi_os_signal);
 995
 996 static int __init acpi_os_name_setup(char *str)
 997 {
 998         char *p = acpi_os_name;
 999         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1000
1001         if (!str || !*str)
1002                 return 0;
1003
1004         for (; count-- && str && *str; str++) {
1005                 if (isalnum(*str) || *str == ' ' || *str == ':')
1006                         *p++ = *str;
1007                 else if (*str == '\'' || *str == '"')
1008                         continue;
1009                 else
1010                         break;
1011         }
1012         *p = 0;
1013
1014         return 1;
1015
1016 }
1017
1018 __setup("acpi_os_name=", acpi_os_name_setup);
1019
1020 static void __init set_osi_linux(unsigned int enable)
1021 {
1022         if (osi_linux.enable != enable) {
1023                 osi_linux.enable = enable;
1024                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1025                         enable ? "Add": "Delet");
1026         }
1027         return;
1028 }
1029
1030 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1031 {
1032         osi_linux.cmdline = 1;  /* cmdline set the default */
1033         set_osi_linux(enable);
1034
1035         return;
1036 }
1037
1038 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1039 {
1040         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1041
1042         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1043
1044         if (enable == -1)
1045                 return;
1046
1047         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1048
1049         set_osi_linux(enable);
1050
1051         return;
1052 }
1053
1054 /*
1055  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1056  *
1057  * empty string disables _OSI
1058  * string starting with '!' disables that string
1059  * otherwise string is added to list, augmenting built-in strings
1060  */
1061 static int __init acpi_osi_setup(char *str)
1062 {
1063         if (str == NULL || *str == '\0') {
1064                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1065                 acpi_gbl_create_osi_method = FALSE;
1066         } else if (!strcmp("!Linux", str)) {
1067                 acpi_cmdline_osi_linux(0);      /* !enable */
1068         } else if (*str == '!') {
1069                 if (acpi_osi_invalidate(++str) == AE_OK)
1070                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1071         } else if (!strcmp("Linux", str)) {
1072                 acpi_cmdline_osi_linux(1);      /* enable */
1073         } else if (*osi_additional_string == '\0') {
1074                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1075                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1076         }
1077
1078         return 1;
1079 }
1080
1081 __setup("acpi_osi=", acpi_osi_setup);
1082
1083 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1084 static int __init acpi_serialize_setup(char *str)
1085 {
1086         printk(KERN_INFO PREFIX "serialize enabled\n");
1087
1088         acpi_gbl_all_methods_serialized = TRUE;
1089
1090         return 1;
1091 }
1092
1093 __setup("acpi_serialize", acpi_serialize_setup);
1094
1095 /*
1096  * Wake and Run-Time GPES are expected to be separate.
1097  * We disable wake-GPEs at run-time to prevent spurious
1098  * interrupts.
1099  *
1100  * However, if a system exists that shares Wake and
1101  * Run-time events on the same GPE this flag is available
1102  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1103  */
1104 static int __init acpi_wake_gpes_always_on_setup(char *str)
1105 {
1106         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1107
1108         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1109
1110         return 1;
1111 }
1112
1113 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1114
1115 /*
1116  * Acquire a spinlock.
1117  *
1118  * handle is a pointer to the spinlock_t.
1119  */
1120
1121 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1122 {
1123         acpi_cpu_flags flags;
1124         spin_lock_irqsave(lockp, flags);
1125         return flags;
1126 }
1127
1128 /*
1129  * Release a spinlock. See above.
1130  */
1131
1132 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1133 {
1134         spin_unlock_irqrestore(lockp, flags);
1135 }
1136
1137 #ifndef ACPI_USE_LOCAL_CACHE
1138
1139 /*******************************************************************************
1140  *
1141  * FUNCTION:    acpi_os_create_cache
1142  *
1143  * PARAMETERS:  name      - Ascii name for the cache
1144  *              size      - Size of each cached object
1145  *              depth     - Maximum depth of the cache (in objects) <ignored>
1146  *              cache     - Where the new cache object is returned
1147  *
1148  * RETURN:      status
1149  *
1150  * DESCRIPTION: Create a cache object
1151  *
1152  ******************************************************************************/
1153
1154 acpi_status
1155 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1156 {
1157         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1158         if (*cache == NULL)
1159                 return AE_ERROR;
1160         else
1161                 return AE_OK;
1162 }
1163
1164 /*******************************************************************************
1165  *
1166  * FUNCTION:    acpi_os_purge_cache
1167  *
1168  * PARAMETERS:  Cache           - Handle to cache object
1169  *
1170  * RETURN:      Status
1171  *
1172  * DESCRIPTION: Free all objects within the requested cache.
1173  *
1174  ******************************************************************************/
1175
1176 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1177 {
1178         kmem_cache_shrink(cache);
1179         return (AE_OK);
1180 }
1181
1182 /*******************************************************************************
1183  *
1184  * FUNCTION:    acpi_os_delete_cache
1185  *
1186  * PARAMETERS:  Cache           - Handle to cache object
1187  *
1188  * RETURN:      Status
1189  *
1190  * DESCRIPTION: Free all objects within the requested cache and delete the
1191  *              cache object.
1192  *
1193  ******************************************************************************/
1194
1195 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1196 {
1197         kmem_cache_destroy(cache);
1198         return (AE_OK);
1199 }
1200
1201 /*******************************************************************************
1202  *
1203  * FUNCTION:    acpi_os_release_object
1204  *
1205  * PARAMETERS:  Cache       - Handle to cache object
1206  *              Object      - The object to be released
1207  *
1208  * RETURN:      None
1209  *
1210  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1211  *              the object is deleted.
1212  *
1213  ******************************************************************************/
1214
1215 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1216 {
1217         kmem_cache_free(cache, object);
1218         return (AE_OK);
1219 }
1220
1221 /**
1222  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1223  *
1224  *      Returns 0 on success
1225  */
1226 int acpi_dmi_dump(void)
1227 {
1228
1229         if (!dmi_available)
1230                 return -1;
1231
1232         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1233                 dmi_get_slot(DMI_SYS_VENDOR));
1234         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1235                 dmi_get_slot(DMI_PRODUCT_NAME));
1236         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1237                 dmi_get_slot(DMI_PRODUCT_VERSION));
1238         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1239                 dmi_get_slot(DMI_BOARD_NAME));
1240         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1241                 dmi_get_slot(DMI_BIOS_VENDOR));
1242         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1243                 dmi_get_slot(DMI_BIOS_DATE));
1244
1245         return 0;
1246 }
1247
1248
1249 /******************************************************************************
1250  *
1251  * FUNCTION:    acpi_os_validate_interface
1252  *
1253  * PARAMETERS:  interface           - Requested interface to be validated
1254  *
1255  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1256  *
1257  * DESCRIPTION: Match an interface string to the interfaces supported by the
1258  *              host. Strings originate from an AML call to the _OSI method.
1259  *
1260  *****************************************************************************/
1261
1262 acpi_status
1263 acpi_os_validate_interface (char *interface)
1264 {
1265         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1266                 return AE_OK;
1267         if (!strcmp("Linux", interface)) {
1268
1269                 printk(KERN_NOTICE PREFIX
1270                         "BIOS _OSI(Linux) query %s%s\n",
1271                         osi_linux.enable ? "honored" : "ignored",
1272                         osi_linux.cmdline ? " via cmdline" :
1273                         osi_linux.dmi ? " via DMI" : "");
1274
1275                 if (!osi_linux.dmi) {
1276                         if (acpi_dmi_dump())
1277                                 printk(KERN_NOTICE PREFIX
1278                                         "[please extract dmidecode output]\n");
1279                         printk(KERN_NOTICE PREFIX
1280                                 "Please send DMI info above to "
1281                                 "linux-acpi@vger.kernel.org\n");
1282                 }
1283                 if (!osi_linux.known && !osi_linux.cmdline) {
1284                         printk(KERN_NOTICE PREFIX
1285                                 "If \"acpi_osi=%sLinux\" works better, "
1286                                 "please notify linux-acpi@vger.kernel.org\n",
1287                                 osi_linux.enable ? "!" : "");
1288                 }
1289
1290                 if (osi_linux.enable)
1291                         return AE_OK;
1292         }
1293         return AE_SUPPORT;
1294 }
1295
1296 /******************************************************************************
1297  *
1298  * FUNCTION:    acpi_os_validate_address
1299  *
1300  * PARAMETERS:  space_id             - ACPI space ID
1301  *              address             - Physical address
1302  *              length              - Address length
1303  *
1304  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1305  *              should return AE_AML_ILLEGAL_ADDRESS.
1306  *
1307  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1308  *              the addresses accessed by AML operation regions.
1309  *
1310  *****************************************************************************/
1311
1312 acpi_status
1313 acpi_os_validate_address (
1314     u8                   space_id,
1315     acpi_physical_address   address,
1316     acpi_size               length)
1317 {
1318
1319     return AE_OK;
1320 }
1321
1322 #endif