drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   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/workqueue.h>
  37 #include <linux/nmi.h>
  38 #include <linux/acpi.h>
  39 #include <acpi/acpi.h>
  40 #include <asm/io.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/processor.h>
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/efi.h>
  46
  47 #define _COMPONENT              ACPI_OS_SERVICES
  48 ACPI_MODULE_NAME("osl");
  49 #define PREFIX          "ACPI: "
  50 struct acpi_os_dpc {
  51         acpi_osd_exec_callback function;
  52         void *context;
  53         struct work_struct work;
  54 };
  55
  56 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  57 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  58 #endif
  59
  60 #ifdef ENABLE_DEBUGGER
  61 #include <linux/kdb.h>
  62
  63 /* stuff for debugger support */
  64 int acpi_in_debugger;
  65 EXPORT_SYMBOL(acpi_in_debugger);
  66
  67 extern char line_buf[80];
  68 #endif                          /*ENABLE_DEBUGGER */
  69
  70 static unsigned int acpi_irq_irq;
  71 static acpi_osd_handler acpi_irq_handler;
  72 static void *acpi_irq_context;
  73 static struct workqueue_struct *kacpid_wq;
  74 static struct workqueue_struct *kacpi_notify_wq;
  75
  76 static void __init acpi_request_region (struct acpi_generic_address *addr,
  77         unsigned int length, char *desc)
  78 {
  79         struct resource *res;
  80
  81         if (!addr->address || !length)
  82                 return;
  83
  84         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  85                 res = request_region(addr->address, length, desc);
  86         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  87                 res = request_mem_region(addr->address, length, desc);
  88 }
  89
  90 static int __init acpi_reserve_resources(void)
  91 {
  92         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
  93                 "ACPI PM1a_EVT_BLK");
  94
  95         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
  96                 "ACPI PM1b_EVT_BLK");
  97
  98         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
  99                 "ACPI PM1a_CNT_BLK");
 100
 101         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 102                 "ACPI PM1b_CNT_BLK");
 103
 104         if (acpi_gbl_FADT.pm_timer_length == 4)
 105                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 106
 107         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 108                 "ACPI PM2_CNT_BLK");
 109
 110         /* Length of GPE blocks must be a non-negative multiple of 2 */
 111
 112         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 113                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 114                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 115
 116         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 117                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 118                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 119
 120         return 0;
 121 }
 122 device_initcall(acpi_reserve_resources);
 123
 124 acpi_status acpi_os_initialize(void)
 125 {
 126         return AE_OK;
 127 }
 128
 129 acpi_status acpi_os_initialize1(void)
 130 {
 131         /*
 132          * Initialize PCI configuration space access, as we'll need to access
 133          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 134          */
 135         if (!raw_pci_ops) {
 136                 printk(KERN_ERR PREFIX
 137                        "Access to PCI configuration space unavailable\n");
 138                 return AE_NULL_ENTRY;
 139         }
 140         kacpid_wq = create_singlethread_workqueue("kacpid");
 141         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 142         BUG_ON(!kacpid_wq);
 143         BUG_ON(!kacpi_notify_wq);
 144         return AE_OK;
 145 }
 146
 147 acpi_status acpi_os_terminate(void)
 148 {
 149         if (acpi_irq_handler) {
 150                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 151                                                  acpi_irq_handler);
 152         }
 153
 154         destroy_workqueue(kacpid_wq);
 155         destroy_workqueue(kacpi_notify_wq);
 156
 157         return AE_OK;
 158 }
 159
 160 void acpi_os_printf(const char *fmt, ...)
 161 {
 162         va_list args;
 163         va_start(args, fmt);
 164         acpi_os_vprintf(fmt, args);
 165         va_end(args);
 166 }
 167
 168 EXPORT_SYMBOL(acpi_os_printf);
 169
 170 void acpi_os_vprintf(const char *fmt, va_list args)
 171 {
 172         static char buffer[512];
 173
 174         vsprintf(buffer, fmt, args);
 175
 176 #ifdef ENABLE_DEBUGGER
 177         if (acpi_in_debugger) {
 178                 kdb_printf("%s", buffer);
 179         } else {
 180                 printk("%s", buffer);
 181         }
 182 #else
 183         printk("%s", buffer);
 184 #endif
 185 }
 186
 187 acpi_physical_address __init acpi_os_get_root_pointer(void)
 188 {
 189         if (efi_enabled) {
 190                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 191                         return efi.acpi20;
 192                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 193                         return efi.acpi;
 194                 else {
 195                         printk(KERN_ERR PREFIX
 196                                "System description tables not found\n");
 197                         return 0;
 198                 }
 199         } else
 200                 return acpi_find_rsdp();
 201 }
 202
 203 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 204 {
 205         if (phys > ULONG_MAX) {
 206                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 207                 return NULL;
 208         }
 209         if (acpi_gbl_permanent_mmap)
 210                 /*
 211                 * ioremap checks to ensure this is in reserved space
 212                 */
 213                 return ioremap((unsigned long)phys, size);
 214         else
 215                 return __acpi_map_table((unsigned long)phys, size);
 216 }
 217 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 218
 219 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 220 {
 221         if (acpi_gbl_permanent_mmap) {
 222                 iounmap(virt);
 223         }
 224 }
 225 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 226
 227 #ifdef ACPI_FUTURE_USAGE
 228 acpi_status
 229 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 230 {
 231         if (!phys || !virt)
 232                 return AE_BAD_PARAMETER;
 233
 234         *phys = virt_to_phys(virt);
 235
 236         return AE_OK;
 237 }
 238 #endif
 239
 240 #define ACPI_MAX_OVERRIDE_LEN 100
 241
 242 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 243
 244 acpi_status
 245 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 246                             acpi_string * new_val)
 247 {
 248         if (!init_val || !new_val)
 249                 return AE_BAD_PARAMETER;
 250
 251         *new_val = NULL;
 252         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 253                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 254                        acpi_os_name);
 255                 *new_val = acpi_os_name;
 256         }
 257
 258         return AE_OK;
 259 }
 260
 261 acpi_status
 262 acpi_os_table_override(struct acpi_table_header * existing_table,
 263                        struct acpi_table_header ** new_table)
 264 {
 265         if (!existing_table || !new_table)
 266                 return AE_BAD_PARAMETER;
 267
 268 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 269         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 270                 *new_table = (struct acpi_table_header *)AmlCode;
 271         else
 272                 *new_table = NULL;
 273 #else
 274         *new_table = NULL;
 275 #endif
 276         return AE_OK;
 277 }
 278
 279 static irqreturn_t acpi_irq(int irq, void *dev_id)
 280 {
 281         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 282 }
 283
 284 acpi_status
 285 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 286                                   void *context)
 287 {
 288         unsigned int irq;
 289
 290         /*
 291          * Ignore the GSI from the core, and use the value in our copy of the
 292          * FADT. It may not be the same if an interrupt source override exists
 293          * for the SCI.
 294          */
 295         gsi = acpi_gbl_FADT.sci_interrupt;
 296         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 297                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 298                        gsi);
 299                 return AE_OK;
 300         }
 301
 302         acpi_irq_handler = handler;
 303         acpi_irq_context = context;
 304         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 305                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 306                 return AE_NOT_ACQUIRED;
 307         }
 308         acpi_irq_irq = irq;
 309
 310         return AE_OK;
 311 }
 312
 313 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 314 {
 315         if (irq) {
 316                 free_irq(irq, acpi_irq);
 317                 acpi_irq_handler = NULL;
 318                 acpi_irq_irq = 0;
 319         }
 320
 321         return AE_OK;
 322 }
 323
 324 /*
 325  * Running in interpreter thread context, safe to sleep
 326  */
 327
 328 void acpi_os_sleep(acpi_integer ms)
 329 {
 330         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 331 }
 332
 333 EXPORT_SYMBOL(acpi_os_sleep);
 334
 335 void acpi_os_stall(u32 us)
 336 {
 337         while (us) {
 338                 u32 delay = 1000;
 339
 340                 if (delay > us)
 341                         delay = us;
 342                 udelay(delay);
 343                 touch_nmi_watchdog();
 344                 us -= delay;
 345         }
 346 }
 347
 348 EXPORT_SYMBOL(acpi_os_stall);
 349
 350 /*
 351  * Support ACPI 3.0 AML Timer operand
 352  * Returns 64-bit free-running, monotonically increasing timer
 353  * with 100ns granularity
 354  */
 355 u64 acpi_os_get_timer(void)
 356 {
 357         static u64 t;
 358
 359 #ifdef  CONFIG_HPET
 360         /* TBD: use HPET if available */
 361 #endif
 362
 363 #ifdef  CONFIG_X86_PM_TIMER
 364         /* TBD: default to PM timer if HPET was not available */
 365 #endif
 366         if (!t)
 367                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 368
 369         return ++t;
 370 }
 371
 372 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 373 {
 374         u32 dummy;
 375
 376         if (!value)
 377                 value = &dummy;
 378
 379         switch (width) {
 380         case 8:
 381                 *(u8 *) value = inb(port);
 382                 break;
 383         case 16:
 384                 *(u16 *) value = inw(port);
 385                 break;
 386         case 32:
 387                 *(u32 *) value = inl(port);
 388                 break;
 389         default:
 390                 BUG();
 391         }
 392
 393         return AE_OK;
 394 }
 395
 396 EXPORT_SYMBOL(acpi_os_read_port);
 397
 398 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 399 {
 400         switch (width) {
 401         case 8:
 402                 outb(value, port);
 403                 break;
 404         case 16:
 405                 outw(value, port);
 406                 break;
 407         case 32:
 408                 outl(value, port);
 409                 break;
 410         default:
 411                 BUG();
 412         }
 413
 414         return AE_OK;
 415 }
 416
 417 EXPORT_SYMBOL(acpi_os_write_port);
 418
 419 acpi_status
 420 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 421 {
 422         u32 dummy;
 423         void __iomem *virt_addr;
 424
 425         virt_addr = ioremap(phys_addr, width);
 426         if (!value)
 427                 value = &dummy;
 428
 429         switch (width) {
 430         case 8:
 431                 *(u8 *) value = readb(virt_addr);
 432                 break;
 433         case 16:
 434                 *(u16 *) value = readw(virt_addr);
 435                 break;
 436         case 32:
 437                 *(u32 *) value = readl(virt_addr);
 438                 break;
 439         default:
 440                 BUG();
 441         }
 442
 443         iounmap(virt_addr);
 444
 445         return AE_OK;
 446 }
 447
 448 acpi_status
 449 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 450 {
 451         void __iomem *virt_addr;
 452
 453         virt_addr = ioremap(phys_addr, width);
 454
 455         switch (width) {
 456         case 8:
 457                 writeb(value, virt_addr);
 458                 break;
 459         case 16:
 460                 writew(value, virt_addr);
 461                 break;
 462         case 32:
 463                 writel(value, virt_addr);
 464                 break;
 465         default:
 466                 BUG();
 467         }
 468
 469         iounmap(virt_addr);
 470
 471         return AE_OK;
 472 }
 473
 474 acpi_status
 475 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 476                                void *value, u32 width)
 477 {
 478         int result, size;
 479
 480         if (!value)
 481                 return AE_BAD_PARAMETER;
 482
 483         switch (width) {
 484         case 8:
 485                 size = 1;
 486                 break;
 487         case 16:
 488                 size = 2;
 489                 break;
 490         case 32:
 491                 size = 4;
 492                 break;
 493         default:
 494                 return AE_ERROR;
 495         }
 496
 497         BUG_ON(!raw_pci_ops);
 498
 499         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 500                                    PCI_DEVFN(pci_id->device, pci_id->function),
 501                                    reg, size, value);
 502
 503         return (result ? AE_ERROR : AE_OK);
 504 }
 505
 506 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 507
 508 acpi_status
 509 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 510                                 acpi_integer value, u32 width)
 511 {
 512         int result, size;
 513
 514         switch (width) {
 515         case 8:
 516                 size = 1;
 517                 break;
 518         case 16:
 519                 size = 2;
 520                 break;
 521         case 32:
 522                 size = 4;
 523                 break;
 524         default:
 525                 return AE_ERROR;
 526         }
 527
 528         BUG_ON(!raw_pci_ops);
 529
 530         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 531                                     PCI_DEVFN(pci_id->device, pci_id->function),
 532                                     reg, size, value);
 533
 534         return (result ? AE_ERROR : AE_OK);
 535 }
 536
 537 /* TODO: Change code to take advantage of driver model more */
 538 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 539                                     acpi_handle chandle,        /* current node */
 540                                     struct acpi_pci_id **id,
 541                                     int *is_bridge, u8 * bus_number)
 542 {
 543         acpi_handle handle;
 544         struct acpi_pci_id *pci_id = *id;
 545         acpi_status status;
 546         unsigned long temp;
 547         acpi_object_type type;
 548         u8 tu8;
 549
 550         acpi_get_parent(chandle, &handle);
 551         if (handle != rhandle) {
 552                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 553                                         bus_number);
 554
 555                 status = acpi_get_type(handle, &type);
 556                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 557                         return;
 558
 559                 status =
 560                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 561                                           &temp);
 562                 if (ACPI_SUCCESS(status)) {
 563                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 564                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 565
 566                         if (*is_bridge)
 567                                 pci_id->bus = *bus_number;
 568
 569                         /* any nicer way to get bus number of bridge ? */
 570                         status =
 571                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 572                                                            8);
 573                         if (ACPI_SUCCESS(status)
 574                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 575                                 status =
 576                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 577                                                                    &tu8, 8);
 578                                 if (!ACPI_SUCCESS(status)) {
 579                                         /* Certainly broken...  FIX ME */
 580                                         return;
 581                                 }
 582                                 *is_bridge = 1;
 583                                 pci_id->bus = tu8;
 584                                 status =
 585                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 586                                                                    &tu8, 8);
 587                                 if (ACPI_SUCCESS(status)) {
 588                                         *bus_number = tu8;
 589                                 }
 590                         } else
 591                                 *is_bridge = 0;
 592                 }
 593         }
 594 }
 595
 596 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 597                            acpi_handle chandle, /* current node */
 598                            struct acpi_pci_id **id)
 599 {
 600         int is_bridge = 1;
 601         u8 bus_number = (*id)->bus;
 602
 603         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 604 }
 605
 606 static void acpi_os_execute_deferred(struct work_struct *work)
 607 {
 608         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 609         if (!dpc) {
 610                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 611                 return;
 612         }
 613
 614         dpc->function(dpc->context);
 615         kfree(dpc);
 616
 617         /* Yield cpu to notify thread */
 618         cond_resched();
 619
 620         return;
 621 }
 622
 623 static void acpi_os_execute_notify(struct work_struct *work)
 624 {
 625         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 626
 627         if (!dpc) {
 628                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 629                 return;
 630         }
 631
 632         dpc->function(dpc->context);
 633
 634         kfree(dpc);
 635
 636         return;
 637 }
 638
 639 /*******************************************************************************
 640  *
 641  * FUNCTION:    acpi_os_execute
 642  *
 643  * PARAMETERS:  Type               - Type of the callback
 644  *              Function           - Function to be executed
 645  *              Context            - Function parameters
 646  *
 647  * RETURN:      Status
 648  *
 649  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 650  *              immediately executes function on a separate thread.
 651  *
 652  ******************************************************************************/
 653
 654 acpi_status acpi_os_execute(acpi_execute_type type,
 655                             acpi_osd_exec_callback function, void *context)
 656 {
 657         acpi_status status = AE_OK;
 658         struct acpi_os_dpc *dpc;
 659
 660         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 661                           "Scheduling function [%p(%p)] for deferred execution.\n",
 662                           function, context));
 663
 664         if (!function)
 665                 return AE_BAD_PARAMETER;
 666
 667         /*
 668          * Allocate/initialize DPC structure.  Note that this memory will be
 669          * freed by the callee.  The kernel handles the work_struct list  in a
 670          * way that allows us to also free its memory inside the callee.
 671          * Because we may want to schedule several tasks with different
 672          * parameters we can't use the approach some kernel code uses of
 673          * having a static work_struct.
 674          */
 675
 676         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 677         if (!dpc)
 678                 return_ACPI_STATUS(AE_NO_MEMORY);
 679
 680         dpc->function = function;
 681         dpc->context = context;
 682
 683         if (type == OSL_NOTIFY_HANDLER) {
 684                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 685                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 686                         status = AE_ERROR;
 687                         kfree(dpc);
 688                 }
 689         } else {
 690                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 691                 if (!queue_work(kacpid_wq, &dpc->work)) {
 692                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 693                                   "Call to queue_work() failed.\n"));
 694                         status = AE_ERROR;
 695                         kfree(dpc);
 696                 }
 697         }
 698         return_ACPI_STATUS(status);
 699 }
 700
 701 EXPORT_SYMBOL(acpi_os_execute);
 702
 703 void acpi_os_wait_events_complete(void *context)
 704 {
 705         flush_workqueue(kacpid_wq);
 706 }
 707
 708 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 709
 710 /*
 711  * Allocate the memory for a spinlock and initialize it.
 712  */
 713 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 714 {
 715         spin_lock_init(*handle);
 716
 717         return AE_OK;
 718 }
 719
 720 /*
 721  * Deallocate the memory for a spinlock.
 722  */
 723 void acpi_os_delete_lock(acpi_spinlock handle)
 724 {
 725         return;
 726 }
 727
 728 acpi_status
 729 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 730 {
 731         struct semaphore *sem = NULL;
 732
 733
 734         sem = acpi_os_allocate(sizeof(struct semaphore));
 735         if (!sem)
 736                 return AE_NO_MEMORY;
 737         memset(sem, 0, sizeof(struct semaphore));
 738
 739         sema_init(sem, initial_units);
 740
 741         *handle = (acpi_handle *) sem;
 742
 743         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 744                           *handle, initial_units));
 745
 746         return AE_OK;
 747 }
 748
 749 EXPORT_SYMBOL(acpi_os_create_semaphore);
 750
 751 /*
 752  * TODO: A better way to delete semaphores?  Linux doesn't have a
 753  * 'delete_semaphore()' function -- may result in an invalid
 754  * pointer dereference for non-synchronized consumers.  Should
 755  * we at least check for blocked threads and signal/cancel them?
 756  */
 757
 758 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 759 {
 760         struct semaphore *sem = (struct semaphore *)handle;
 761
 762
 763         if (!sem)
 764                 return AE_BAD_PARAMETER;
 765
 766         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 767
 768         kfree(sem);
 769         sem = NULL;
 770
 771         return AE_OK;
 772 }
 773
 774 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 775
 776 /*
 777  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 778  * improvise.  The process is to sleep for one scheduler quantum
 779  * until the semaphore becomes available.  Downside is that this
 780  * may result in starvation for timeout-based waits when there's
 781  * lots of semaphore activity.
 782  *
 783  * TODO: Support for units > 1?
 784  */
 785 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 786 {
 787         acpi_status status = AE_OK;
 788         struct semaphore *sem = (struct semaphore *)handle;
 789         int ret = 0;
 790
 791
 792         if (!sem || (units < 1))
 793                 return AE_BAD_PARAMETER;
 794
 795         if (units > 1)
 796                 return AE_SUPPORT;
 797
 798         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 799                           handle, units, timeout));
 800
 801         /*
 802          * This can be called during resume with interrupts off.
 803          * Like boot-time, we should be single threaded and will
 804          * always get the lock if we try -- timeout or not.
 805          * If this doesn't succeed, then we will oops courtesy of
 806          * might_sleep() in down().
 807          */
 808         if (!down_trylock(sem))
 809                 return AE_OK;
 810
 811         switch (timeout) {
 812                 /*
 813                  * No Wait:
 814                  * --------
 815                  * A zero timeout value indicates that we shouldn't wait - just
 816                  * acquire the semaphore if available otherwise return AE_TIME
 817                  * (a.k.a. 'would block').
 818                  */
 819         case 0:
 820                 if (down_trylock(sem))
 821                         status = AE_TIME;
 822                 break;
 823
 824                 /*
 825                  * Wait Indefinitely:
 826                  * ------------------
 827                  */
 828         case ACPI_WAIT_FOREVER:
 829                 down(sem);
 830                 break;
 831
 832                 /*
 833                  * Wait w/ Timeout:
 834                  * ----------------
 835                  */
 836         default:
 837                 // TODO: A better timeout algorithm?
 838                 {
 839                         int i = 0;
 840                         static const int quantum_ms = 1000 / HZ;
 841
 842                         ret = down_trylock(sem);
 843                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 844                                 schedule_timeout_interruptible(1);
 845                                 ret = down_trylock(sem);
 846                         }
 847
 848                         if (ret != 0)
 849                                 status = AE_TIME;
 850                 }
 851                 break;
 852         }
 853
 854         if (ACPI_FAILURE(status)) {
 855                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 856                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 857                                   handle, units, timeout,
 858                                   acpi_format_exception(status)));
 859         } else {
 860                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 861                                   "Acquired semaphore[%p|%d|%d]", handle,
 862                                   units, timeout));
 863         }
 864
 865         return status;
 866 }
 867
 868 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 869
 870 /*
 871  * TODO: Support for units > 1?
 872  */
 873 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 874 {
 875         struct semaphore *sem = (struct semaphore *)handle;
 876
 877
 878         if (!sem || (units < 1))
 879                 return AE_BAD_PARAMETER;
 880
 881         if (units > 1)
 882                 return AE_SUPPORT;
 883
 884         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 885                           units));
 886
 887         up(sem);
 888
 889         return AE_OK;
 890 }
 891
 892 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 893
 894 #ifdef ACPI_FUTURE_USAGE
 895 u32 acpi_os_get_line(char *buffer)
 896 {
 897
 898 #ifdef ENABLE_DEBUGGER
 899         if (acpi_in_debugger) {
 900                 u32 chars;
 901
 902                 kdb_read(buffer, sizeof(line_buf));
 903
 904                 /* remove the CR kdb includes */
 905                 chars = strlen(buffer) - 1;
 906                 buffer[chars] = '\0';
 907         }
 908 #endif
 909
 910         return 0;
 911 }
 912 #endif                          /*  ACPI_FUTURE_USAGE  */
 913
 914 acpi_status acpi_os_signal(u32 function, void *info)
 915 {
 916         switch (function) {
 917         case ACPI_SIGNAL_FATAL:
 918                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 919                 break;
 920         case ACPI_SIGNAL_BREAKPOINT:
 921                 /*
 922                  * AML Breakpoint
 923                  * ACPI spec. says to treat it as a NOP unless
 924                  * you are debugging.  So if/when we integrate
 925                  * AML debugger into the kernel debugger its
 926                  * hook will go here.  But until then it is
 927                  * not useful to print anything on breakpoints.
 928                  */
 929                 break;
 930         default:
 931                 break;
 932         }
 933
 934         return AE_OK;
 935 }
 936
 937 EXPORT_SYMBOL(acpi_os_signal);
 938
 939 static int __init acpi_os_name_setup(char *str)
 940 {
 941         char *p = acpi_os_name;
 942         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 943
 944         if (!str || !*str)
 945                 return 0;
 946
 947         for (; count-- && str && *str; str++) {
 948                 if (isalnum(*str) || *str == ' ' || *str == ':')
 949                         *p++ = *str;
 950                 else if (*str == '\'' || *str == '"')
 951                         continue;
 952                 else
 953                         break;
 954         }
 955         *p = 0;
 956
 957         return 1;
 958
 959 }
 960
 961 __setup("acpi_os_name=", acpi_os_name_setup);
 962
 963 /*
 964  * _OSI control
 965  * empty string disables _OSI
 966  * TBD additional string adds to _OSI
 967  */
 968 static int __init acpi_osi_setup(char *str)
 969 {
 970         if (str == NULL || *str == '\0') {
 971                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 972                 acpi_gbl_create_osi_method = FALSE;
 973         } else {
 974                 /* TBD */
 975                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 976                        str);
 977         }
 978
 979         return 1;
 980 }
 981
 982 __setup("acpi_osi=", acpi_osi_setup);
 983
 984 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 985 static int __init acpi_serialize_setup(char *str)
 986 {
 987         printk(KERN_INFO PREFIX "serialize enabled\n");
 988
 989         acpi_gbl_all_methods_serialized = TRUE;
 990
 991         return 1;
 992 }
 993
 994 __setup("acpi_serialize", acpi_serialize_setup);
 995
 996 /*
 997  * Wake and Run-Time GPES are expected to be separate.
 998  * We disable wake-GPEs at run-time to prevent spurious
 999  * interrupts.
1000  *
1001  * However, if a system exists that shares Wake and
1002  * Run-time events on the same GPE this flag is available
1003  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1004  */
1005 static int __init acpi_wake_gpes_always_on_setup(char *str)
1006 {
1007         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1008
1009         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1010
1011         return 1;
1012 }
1013
1014 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1015
1016 /*
1017  * max_cstate is defined in the base kernel so modules can
1018  * change it w/o depending on the state of the processor module.
1019  */
1020 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1021
1022 EXPORT_SYMBOL(max_cstate);
1023
1024 /*
1025  * Acquire a spinlock.
1026  *
1027  * handle is a pointer to the spinlock_t.
1028  */
1029
1030 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1031 {
1032         acpi_cpu_flags flags;
1033         spin_lock_irqsave(lockp, flags);
1034         return flags;
1035 }
1036
1037 /*
1038  * Release a spinlock. See above.
1039  */
1040
1041 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1042 {
1043         spin_unlock_irqrestore(lockp, flags);
1044 }
1045
1046 #ifndef ACPI_USE_LOCAL_CACHE
1047
1048 /*******************************************************************************
1049  *
1050  * FUNCTION:    acpi_os_create_cache
1051  *
1052  * PARAMETERS:  name      - Ascii name for the cache
1053  *              size      - Size of each cached object
1054  *              depth     - Maximum depth of the cache (in objects) <ignored>
1055  *              cache     - Where the new cache object is returned
1056  *
1057  * RETURN:      status
1058  *
1059  * DESCRIPTION: Create a cache object
1060  *
1061  ******************************************************************************/
1062
1063 acpi_status
1064 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1065 {
1066         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1067         if (*cache == NULL)
1068                 return AE_ERROR;
1069         else
1070                 return AE_OK;
1071 }
1072
1073 /*******************************************************************************
1074  *
1075  * FUNCTION:    acpi_os_purge_cache
1076  *
1077  * PARAMETERS:  Cache           - Handle to cache object
1078  *
1079  * RETURN:      Status
1080  *
1081  * DESCRIPTION: Free all objects within the requested cache.
1082  *
1083  ******************************************************************************/
1084
1085 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1086 {
1087         kmem_cache_shrink(cache);
1088         return (AE_OK);
1089 }
1090
1091 /*******************************************************************************
1092  *
1093  * FUNCTION:    acpi_os_delete_cache
1094  *
1095  * PARAMETERS:  Cache           - Handle to cache object
1096  *
1097  * RETURN:      Status
1098  *
1099  * DESCRIPTION: Free all objects within the requested cache and delete the
1100  *              cache object.
1101  *
1102  ******************************************************************************/
1103
1104 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1105 {
1106         kmem_cache_destroy(cache);
1107         return (AE_OK);
1108 }
1109
1110 /*******************************************************************************
1111  *
1112  * FUNCTION:    acpi_os_release_object
1113  *
1114  * PARAMETERS:  Cache       - Handle to cache object
1115  *              Object      - The object to be released
1116  *
1117  * RETURN:      None
1118  *
1119  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1120  *              the object is deleted.
1121  *
1122  ******************************************************************************/
1123
1124 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1125 {
1126         kmem_cache_free(cache, object);
1127         return (AE_OK);
1128 }
1129
1130 /******************************************************************************
1131  *
1132  * FUNCTION:    acpi_os_validate_interface
1133  *
1134  * PARAMETERS:  interface           - Requested interface to be validated
1135  *
1136  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1137  *
1138  * DESCRIPTION: Match an interface string to the interfaces supported by the
1139  *              host. Strings originate from an AML call to the _OSI method.
1140  *
1141  *****************************************************************************/
1142
1143 acpi_status
1144 acpi_os_validate_interface (char *interface)
1145 {
1146
1147     return AE_SUPPORT;
1148 }
1149
1150
1151 /******************************************************************************
1152  *
1153  * FUNCTION:    acpi_os_validate_address
1154  *
1155  * PARAMETERS:  space_id             - ACPI space ID
1156  *              address             - Physical address
1157  *              length              - Address length
1158  *
1159  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1160  *              should return AE_AML_ILLEGAL_ADDRESS.
1161  *
1162  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1163  *              the addresses accessed by AML operation regions.
1164  *
1165  *****************************************************************************/
1166
1167 acpi_status
1168 acpi_os_validate_address (
1169     u8                   space_id,
1170     acpi_physical_address   address,
1171     acpi_size               length)
1172 {
1173
1174     return AE_OK;
1175 }
1176
1177
1178 #endif