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/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 static 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                 acpi_physical_address pa = 0;
 255
 256                 acpi_find_root_pointer(&pa);
 257                 return pa;
 258         }
 259 }
 260
 261 void __iomem *__init_refok
 262 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 263 {
 264         if (phys > ULONG_MAX) {
 265                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 266                 return NULL;
 267         }
 268         if (acpi_gbl_permanent_mmap)
 269                 /*
 270                 * ioremap checks to ensure this is in reserved space
 271                 */
 272                 return ioremap((unsigned long)phys, size);
 273         else
 274                 return __acpi_map_table((unsigned long)phys, size);
 275 }
 276 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 277
 278 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 279 {
 280         if (acpi_gbl_permanent_mmap) {
 281                 iounmap(virt);
 282         }
 283 }
 284 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 285
 286 #ifdef ACPI_FUTURE_USAGE
 287 acpi_status
 288 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 289 {
 290         if (!phys || !virt)
 291                 return AE_BAD_PARAMETER;
 292
 293         *phys = virt_to_phys(virt);
 294
 295         return AE_OK;
 296 }
 297 #endif
 298
 299 #define ACPI_MAX_OVERRIDE_LEN 100
 300
 301 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 302
 303 acpi_status
 304 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 305                             acpi_string * new_val)
 306 {
 307         if (!init_val || !new_val)
 308                 return AE_BAD_PARAMETER;
 309
 310         *new_val = NULL;
 311         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 312                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 313                        acpi_os_name);
 314                 *new_val = acpi_os_name;
 315         }
 316
 317         return AE_OK;
 318 }
 319
 320 acpi_status
 321 acpi_os_table_override(struct acpi_table_header * existing_table,
 322                        struct acpi_table_header ** new_table)
 323 {
 324         if (!existing_table || !new_table)
 325                 return AE_BAD_PARAMETER;
 326
 327 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 328         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 329                 *new_table = (struct acpi_table_header *)AmlCode;
 330         else
 331                 *new_table = NULL;
 332 #else
 333         *new_table = NULL;
 334 #endif
 335         return AE_OK;
 336 }
 337
 338 static irqreturn_t acpi_irq(int irq, void *dev_id)
 339 {
 340         u32 handled;
 341
 342         handled = (*acpi_irq_handler) (acpi_irq_context);
 343
 344         if (handled) {
 345                 acpi_irq_handled++;
 346                 return IRQ_HANDLED;
 347         } else
 348                 return IRQ_NONE;
 349 }
 350
 351 acpi_status
 352 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 353                                   void *context)
 354 {
 355         unsigned int irq;
 356
 357         acpi_irq_stats_init();
 358
 359         /*
 360          * Ignore the GSI from the core, and use the value in our copy of the
 361          * FADT. It may not be the same if an interrupt source override exists
 362          * for the SCI.
 363          */
 364         gsi = acpi_gbl_FADT.sci_interrupt;
 365         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 366                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 367                        gsi);
 368                 return AE_OK;
 369         }
 370
 371         acpi_irq_handler = handler;
 372         acpi_irq_context = context;
 373         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 374                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 375                 return AE_NOT_ACQUIRED;
 376         }
 377         acpi_irq_irq = irq;
 378
 379         return AE_OK;
 380 }
 381
 382 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 383 {
 384         if (irq) {
 385                 free_irq(irq, acpi_irq);
 386                 acpi_irq_handler = NULL;
 387                 acpi_irq_irq = 0;
 388         }
 389
 390         return AE_OK;
 391 }
 392
 393 /*
 394  * Running in interpreter thread context, safe to sleep
 395  */
 396
 397 void acpi_os_sleep(acpi_integer ms)
 398 {
 399         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 400 }
 401
 402 EXPORT_SYMBOL(acpi_os_sleep);
 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 EXPORT_SYMBOL(acpi_os_stall);
 418
 419 /*
 420  * Support ACPI 3.0 AML Timer operand
 421  * Returns 64-bit free-running, monotonically increasing timer
 422  * with 100ns granularity
 423  */
 424 u64 acpi_os_get_timer(void)
 425 {
 426         static u64 t;
 427
 428 #ifdef  CONFIG_HPET
 429         /* TBD: use HPET if available */
 430 #endif
 431
 432 #ifdef  CONFIG_X86_PM_TIMER
 433         /* TBD: default to PM timer if HPET was not available */
 434 #endif
 435         if (!t)
 436                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 437
 438         return ++t;
 439 }
 440
 441 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 442 {
 443         u32 dummy;
 444
 445         if (!value)
 446                 value = &dummy;
 447
 448         *value = 0;
 449         if (width <= 8) {
 450                 *(u8 *) value = inb(port);
 451         } else if (width <= 16) {
 452                 *(u16 *) value = inw(port);
 453         } else if (width <= 32) {
 454                 *(u32 *) value = inl(port);
 455         } else {
 456                 BUG();
 457         }
 458
 459         return AE_OK;
 460 }
 461
 462 EXPORT_SYMBOL(acpi_os_read_port);
 463
 464 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 465 {
 466         if (width <= 8) {
 467                 outb(value, port);
 468         } else if (width <= 16) {
 469                 outw(value, port);
 470         } else if (width <= 32) {
 471                 outl(value, port);
 472         } else {
 473                 BUG();
 474         }
 475
 476         return AE_OK;
 477 }
 478
 479 EXPORT_SYMBOL(acpi_os_write_port);
 480
 481 acpi_status
 482 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 483 {
 484         u32 dummy;
 485         void __iomem *virt_addr;
 486
 487         virt_addr = ioremap(phys_addr, width);
 488         if (!value)
 489                 value = &dummy;
 490
 491         switch (width) {
 492         case 8:
 493                 *(u8 *) value = readb(virt_addr);
 494                 break;
 495         case 16:
 496                 *(u16 *) value = readw(virt_addr);
 497                 break;
 498         case 32:
 499                 *(u32 *) value = readl(virt_addr);
 500                 break;
 501         default:
 502                 BUG();
 503         }
 504
 505         iounmap(virt_addr);
 506
 507         return AE_OK;
 508 }
 509
 510 acpi_status
 511 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 512 {
 513         void __iomem *virt_addr;
 514
 515         virt_addr = ioremap(phys_addr, width);
 516
 517         switch (width) {
 518         case 8:
 519                 writeb(value, virt_addr);
 520                 break;
 521         case 16:
 522                 writew(value, virt_addr);
 523                 break;
 524         case 32:
 525                 writel(value, virt_addr);
 526                 break;
 527         default:
 528                 BUG();
 529         }
 530
 531         iounmap(virt_addr);
 532
 533         return AE_OK;
 534 }
 535
 536 acpi_status
 537 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 538                                void *value, u32 width)
 539 {
 540         int result, size;
 541
 542         if (!value)
 543                 return AE_BAD_PARAMETER;
 544
 545         switch (width) {
 546         case 8:
 547                 size = 1;
 548                 break;
 549         case 16:
 550                 size = 2;
 551                 break;
 552         case 32:
 553                 size = 4;
 554                 break;
 555         default:
 556                 return AE_ERROR;
 557         }
 558
 559         BUG_ON(!raw_pci_ops);
 560
 561         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 562                                    PCI_DEVFN(pci_id->device, pci_id->function),
 563                                    reg, size, value);
 564
 565         return (result ? AE_ERROR : AE_OK);
 566 }
 567
 568 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 569
 570 acpi_status
 571 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 572                                 acpi_integer value, u32 width)
 573 {
 574         int result, size;
 575
 576         switch (width) {
 577         case 8:
 578                 size = 1;
 579                 break;
 580         case 16:
 581                 size = 2;
 582                 break;
 583         case 32:
 584                 size = 4;
 585                 break;
 586         default:
 587                 return AE_ERROR;
 588         }
 589
 590         BUG_ON(!raw_pci_ops);
 591
 592         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 593                                     PCI_DEVFN(pci_id->device, pci_id->function),
 594                                     reg, size, value);
 595
 596         return (result ? AE_ERROR : AE_OK);
 597 }
 598
 599 /* TODO: Change code to take advantage of driver model more */
 600 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 601                                     acpi_handle chandle,        /* current node */
 602                                     struct acpi_pci_id **id,
 603                                     int *is_bridge, u8 * bus_number)
 604 {
 605         acpi_handle handle;
 606         struct acpi_pci_id *pci_id = *id;
 607         acpi_status status;
 608         unsigned long temp;
 609         acpi_object_type type;
 610         u8 tu8;
 611
 612         acpi_get_parent(chandle, &handle);
 613         if (handle != rhandle) {
 614                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 615                                         bus_number);
 616
 617                 status = acpi_get_type(handle, &type);
 618                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 619                         return;
 620
 621                 status =
 622                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 623                                           &temp);
 624                 if (ACPI_SUCCESS(status)) {
 625                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 626                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 627
 628                         if (*is_bridge)
 629                                 pci_id->bus = *bus_number;
 630
 631                         /* any nicer way to get bus number of bridge ? */
 632                         status =
 633                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 634                                                            8);
 635                         if (ACPI_SUCCESS(status)
 636                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 637                                 status =
 638                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 639                                                                    &tu8, 8);
 640                                 if (!ACPI_SUCCESS(status)) {
 641                                         /* Certainly broken...  FIX ME */
 642                                         return;
 643                                 }
 644                                 *is_bridge = 1;
 645                                 pci_id->bus = tu8;
 646                                 status =
 647                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 648                                                                    &tu8, 8);
 649                                 if (ACPI_SUCCESS(status)) {
 650                                         *bus_number = tu8;
 651                                 }
 652                         } else
 653                                 *is_bridge = 0;
 654                 }
 655         }
 656 }
 657
 658 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 659                            acpi_handle chandle, /* current node */
 660                            struct acpi_pci_id **id)
 661 {
 662         int is_bridge = 1;
 663         u8 bus_number = (*id)->bus;
 664
 665         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 666 }
 667
 668 static void acpi_os_execute_deferred(struct work_struct *work)
 669 {
 670         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 671         if (!dpc) {
 672                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 673                 return;
 674         }
 675
 676         dpc->function(dpc->context);
 677         kfree(dpc);
 678
 679         return;
 680 }
 681
 682 /*******************************************************************************
 683  *
 684  * FUNCTION:    acpi_os_execute
 685  *
 686  * PARAMETERS:  Type               - Type of the callback
 687  *              Function           - Function to be executed
 688  *              Context            - Function parameters
 689  *
 690  * RETURN:      Status
 691  *
 692  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 693  *              immediately executes function on a separate thread.
 694  *
 695  ******************************************************************************/
 696
 697 acpi_status acpi_os_execute(acpi_execute_type type,
 698                             acpi_osd_exec_callback function, void *context)
 699 {
 700         acpi_status status = AE_OK;
 701         struct acpi_os_dpc *dpc;
 702         struct workqueue_struct *queue;
 703         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 704                           "Scheduling function [%p(%p)] for deferred execution.\n",
 705                           function, context));
 706
 707         if (!function)
 708                 return AE_BAD_PARAMETER;
 709
 710         /*
 711          * Allocate/initialize DPC structure.  Note that this memory will be
 712          * freed by the callee.  The kernel handles the work_struct list  in a
 713          * way that allows us to also free its memory inside the callee.
 714          * Because we may want to schedule several tasks with different
 715          * parameters we can't use the approach some kernel code uses of
 716          * having a static work_struct.
 717          */
 718
 719         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 720         if (!dpc)
 721                 return_ACPI_STATUS(AE_NO_MEMORY);
 722
 723         dpc->function = function;
 724         dpc->context = context;
 725
 726         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 727         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
 728         if (!queue_work(queue, &dpc->work)) {
 729                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 730                           "Call to queue_work() failed.\n"));
 731                 status = AE_ERROR;
 732                 kfree(dpc);
 733         }
 734         return_ACPI_STATUS(status);
 735 }
 736
 737 EXPORT_SYMBOL(acpi_os_execute);
 738
 739 void acpi_os_wait_events_complete(void *context)
 740 {
 741         flush_workqueue(kacpid_wq);
 742 }
 743
 744 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 745
 746 /*
 747  * Allocate the memory for a spinlock and initialize it.
 748  */
 749 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 750 {
 751         spin_lock_init(*handle);
 752
 753         return AE_OK;
 754 }
 755
 756 /*
 757  * Deallocate the memory for a spinlock.
 758  */
 759 void acpi_os_delete_lock(acpi_spinlock handle)
 760 {
 761         return;
 762 }
 763
 764 acpi_status
 765 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 766 {
 767         struct semaphore *sem = NULL;
 768
 769
 770         sem = acpi_os_allocate(sizeof(struct semaphore));
 771         if (!sem)
 772                 return AE_NO_MEMORY;
 773         memset(sem, 0, sizeof(struct semaphore));
 774
 775         sema_init(sem, initial_units);
 776
 777         *handle = (acpi_handle *) sem;
 778
 779         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 780                           *handle, initial_units));
 781
 782         return AE_OK;
 783 }
 784
 785 EXPORT_SYMBOL(acpi_os_create_semaphore);
 786
 787 /*
 788  * TODO: A better way to delete semaphores?  Linux doesn't have a
 789  * 'delete_semaphore()' function -- may result in an invalid
 790  * pointer dereference for non-synchronized consumers.  Should
 791  * we at least check for blocked threads and signal/cancel them?
 792  */
 793
 794 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 795 {
 796         struct semaphore *sem = (struct semaphore *)handle;
 797
 798
 799         if (!sem)
 800                 return AE_BAD_PARAMETER;
 801
 802         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 803
 804         kfree(sem);
 805         sem = NULL;
 806
 807         return AE_OK;
 808 }
 809
 810 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 811
 812 /*
 813  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 814  * improvise.  The process is to sleep for one scheduler quantum
 815  * until the semaphore becomes available.  Downside is that this
 816  * may result in starvation for timeout-based waits when there's
 817  * lots of semaphore activity.
 818  *
 819  * TODO: Support for units > 1?
 820  */
 821 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 822 {
 823         acpi_status status = AE_OK;
 824         struct semaphore *sem = (struct semaphore *)handle;
 825         int ret = 0;
 826
 827
 828         if (!sem || (units < 1))
 829                 return AE_BAD_PARAMETER;
 830
 831         if (units > 1)
 832                 return AE_SUPPORT;
 833
 834         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 835                           handle, units, timeout));
 836
 837         /*
 838          * This can be called during resume with interrupts off.
 839          * Like boot-time, we should be single threaded and will
 840          * always get the lock if we try -- timeout or not.
 841          * If this doesn't succeed, then we will oops courtesy of
 842          * might_sleep() in down().
 843          */
 844         if (!down_trylock(sem))
 845                 return AE_OK;
 846
 847         switch (timeout) {
 848                 /*
 849                  * No Wait:
 850                  * --------
 851                  * A zero timeout value indicates that we shouldn't wait - just
 852                  * acquire the semaphore if available otherwise return AE_TIME
 853                  * (a.k.a. 'would block').
 854                  */
 855         case 0:
 856                 if (down_trylock(sem))
 857                         status = AE_TIME;
 858                 break;
 859
 860                 /*
 861                  * Wait Indefinitely:
 862                  * ------------------
 863                  */
 864         case ACPI_WAIT_FOREVER:
 865                 down(sem);
 866                 break;
 867
 868                 /*
 869                  * Wait w/ Timeout:
 870                  * ----------------
 871                  */
 872         default:
 873                 // TODO: A better timeout algorithm?
 874                 {
 875                         int i = 0;
 876                         static const int quantum_ms = 1000 / HZ;
 877
 878                         ret = down_trylock(sem);
 879                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 880                                 schedule_timeout_interruptible(1);
 881                                 ret = down_trylock(sem);
 882                         }
 883
 884                         if (ret != 0)
 885                                 status = AE_TIME;
 886                 }
 887                 break;
 888         }
 889
 890         if (ACPI_FAILURE(status)) {
 891                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 892                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 893                                   handle, units, timeout,
 894                                   acpi_format_exception(status)));
 895         } else {
 896                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 897                                   "Acquired semaphore[%p|%d|%d]", handle,
 898                                   units, timeout));
 899         }
 900
 901         return status;
 902 }
 903
 904 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 905
 906 /*
 907  * TODO: Support for units > 1?
 908  */
 909 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 910 {
 911         struct semaphore *sem = (struct semaphore *)handle;
 912
 913
 914         if (!sem || (units < 1))
 915                 return AE_BAD_PARAMETER;
 916
 917         if (units > 1)
 918                 return AE_SUPPORT;
 919
 920         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 921                           units));
 922
 923         up(sem);
 924
 925         return AE_OK;
 926 }
 927
 928 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 929
 930 #ifdef ACPI_FUTURE_USAGE
 931 u32 acpi_os_get_line(char *buffer)
 932 {
 933
 934 #ifdef ENABLE_DEBUGGER
 935         if (acpi_in_debugger) {
 936                 u32 chars;
 937
 938                 kdb_read(buffer, sizeof(line_buf));
 939
 940                 /* remove the CR kdb includes */
 941                 chars = strlen(buffer) - 1;
 942                 buffer[chars] = '\0';
 943         }
 944 #endif
 945
 946         return 0;
 947 }
 948 #endif                          /*  ACPI_FUTURE_USAGE  */
 949
 950 acpi_status acpi_os_signal(u32 function, void *info)
 951 {
 952         switch (function) {
 953         case ACPI_SIGNAL_FATAL:
 954                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 955                 break;
 956         case ACPI_SIGNAL_BREAKPOINT:
 957                 /*
 958                  * AML Breakpoint
 959                  * ACPI spec. says to treat it as a NOP unless
 960                  * you are debugging.  So if/when we integrate
 961                  * AML debugger into the kernel debugger its
 962                  * hook will go here.  But until then it is
 963                  * not useful to print anything on breakpoints.
 964                  */
 965                 break;
 966         default:
 967                 break;
 968         }
 969
 970         return AE_OK;
 971 }
 972
 973 EXPORT_SYMBOL(acpi_os_signal);
 974
 975 static int __init acpi_os_name_setup(char *str)
 976 {
 977         char *p = acpi_os_name;
 978         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 979
 980         if (!str || !*str)
 981                 return 0;
 982
 983         for (; count-- && str && *str; str++) {
 984                 if (isalnum(*str) || *str == ' ' || *str == ':')
 985                         *p++ = *str;
 986                 else if (*str == '\'' || *str == '"')
 987                         continue;
 988                 else
 989                         break;
 990         }
 991         *p = 0;
 992
 993         return 1;
 994
 995 }
 996
 997 __setup("acpi_os_name=", acpi_os_name_setup);
 998
 999 static void __init set_osi_linux(unsigned int enable)
1000 {
1001         if (osi_linux.enable != enable) {
1002                 osi_linux.enable = enable;
1003                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1004                         enable ? "Add": "Delet");
1005         }
1006         return;
1007 }
1008
1009 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1010 {
1011         osi_linux.cmdline = 1;  /* cmdline set the default */
1012         set_osi_linux(enable);
1013
1014         return;
1015 }
1016
1017 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1018 {
1019         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1020
1021         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1022
1023         if (enable == -1)
1024                 return;
1025
1026         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1027
1028         set_osi_linux(enable);
1029
1030         return;
1031 }
1032
1033 /*
1034  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1035  *
1036  * empty string disables _OSI
1037  * string starting with '!' disables that string
1038  * otherwise string is added to list, augmenting built-in strings
1039  */
1040 static int __init acpi_osi_setup(char *str)
1041 {
1042         if (str == NULL || *str == '\0') {
1043                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1044                 acpi_gbl_create_osi_method = FALSE;
1045         } else if (!strcmp("!Linux", str)) {
1046                 acpi_cmdline_osi_linux(0);      /* !enable */
1047         } else if (*str == '!') {
1048                 if (acpi_osi_invalidate(++str) == AE_OK)
1049                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1050         } else if (!strcmp("Linux", str)) {
1051                 acpi_cmdline_osi_linux(1);      /* enable */
1052         } else if (*osi_additional_string == '\0') {
1053                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1054                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1055         }
1056
1057         return 1;
1058 }
1059
1060 __setup("acpi_osi=", acpi_osi_setup);
1061
1062 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1063 static int __init acpi_serialize_setup(char *str)
1064 {
1065         printk(KERN_INFO PREFIX "serialize enabled\n");
1066
1067         acpi_gbl_all_methods_serialized = TRUE;
1068
1069         return 1;
1070 }
1071
1072 __setup("acpi_serialize", acpi_serialize_setup);
1073
1074 /*
1075  * Wake and Run-Time GPES are expected to be separate.
1076  * We disable wake-GPEs at run-time to prevent spurious
1077  * interrupts.
1078  *
1079  * However, if a system exists that shares Wake and
1080  * Run-time events on the same GPE this flag is available
1081  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1082  */
1083 static int __init acpi_wake_gpes_always_on_setup(char *str)
1084 {
1085         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1086
1087         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1088
1089         return 1;
1090 }
1091
1092 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1093
1094 /*
1095  * Acquire a spinlock.
1096  *
1097  * handle is a pointer to the spinlock_t.
1098  */
1099
1100 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1101 {
1102         acpi_cpu_flags flags;
1103         spin_lock_irqsave(lockp, flags);
1104         return flags;
1105 }
1106
1107 /*
1108  * Release a spinlock. See above.
1109  */
1110
1111 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1112 {
1113         spin_unlock_irqrestore(lockp, flags);
1114 }
1115
1116 #ifndef ACPI_USE_LOCAL_CACHE
1117
1118 /*******************************************************************************
1119  *
1120  * FUNCTION:    acpi_os_create_cache
1121  *
1122  * PARAMETERS:  name      - Ascii name for the cache
1123  *              size      - Size of each cached object
1124  *              depth     - Maximum depth of the cache (in objects) <ignored>
1125  *              cache     - Where the new cache object is returned
1126  *
1127  * RETURN:      status
1128  *
1129  * DESCRIPTION: Create a cache object
1130  *
1131  ******************************************************************************/
1132
1133 acpi_status
1134 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1135 {
1136         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1137         if (*cache == NULL)
1138                 return AE_ERROR;
1139         else
1140                 return AE_OK;
1141 }
1142
1143 /*******************************************************************************
1144  *
1145  * FUNCTION:    acpi_os_purge_cache
1146  *
1147  * PARAMETERS:  Cache           - Handle to cache object
1148  *
1149  * RETURN:      Status
1150  *
1151  * DESCRIPTION: Free all objects within the requested cache.
1152  *
1153  ******************************************************************************/
1154
1155 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1156 {
1157         kmem_cache_shrink(cache);
1158         return (AE_OK);
1159 }
1160
1161 /*******************************************************************************
1162  *
1163  * FUNCTION:    acpi_os_delete_cache
1164  *
1165  * PARAMETERS:  Cache           - Handle to cache object
1166  *
1167  * RETURN:      Status
1168  *
1169  * DESCRIPTION: Free all objects within the requested cache and delete the
1170  *              cache object.
1171  *
1172  ******************************************************************************/
1173
1174 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1175 {
1176         kmem_cache_destroy(cache);
1177         return (AE_OK);
1178 }
1179
1180 /*******************************************************************************
1181  *
1182  * FUNCTION:    acpi_os_release_object
1183  *
1184  * PARAMETERS:  Cache       - Handle to cache object
1185  *              Object      - The object to be released
1186  *
1187  * RETURN:      None
1188  *
1189  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1190  *              the object is deleted.
1191  *
1192  ******************************************************************************/
1193
1194 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1195 {
1196         kmem_cache_free(cache, object);
1197         return (AE_OK);
1198 }
1199
1200 /**
1201  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1202  *
1203  *      Returns 0 on success
1204  */
1205 static int acpi_dmi_dump(void)
1206 {
1207
1208         if (!dmi_available)
1209                 return -1;
1210
1211         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1212                 dmi_get_system_info(DMI_SYS_VENDOR));
1213         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1214                 dmi_get_system_info(DMI_PRODUCT_NAME));
1215         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1216                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1217         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1218                 dmi_get_system_info(DMI_BOARD_NAME));
1219         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1220                 dmi_get_system_info(DMI_BIOS_VENDOR));
1221         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1222                 dmi_get_system_info(DMI_BIOS_DATE));
1223
1224         return 0;
1225 }
1226
1227
1228 /******************************************************************************
1229  *
1230  * FUNCTION:    acpi_os_validate_interface
1231  *
1232  * PARAMETERS:  interface           - Requested interface to be validated
1233  *
1234  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1235  *
1236  * DESCRIPTION: Match an interface string to the interfaces supported by the
1237  *              host. Strings originate from an AML call to the _OSI method.
1238  *
1239  *****************************************************************************/
1240
1241 acpi_status
1242 acpi_os_validate_interface (char *interface)
1243 {
1244         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1245                 return AE_OK;
1246         if (!strcmp("Linux", interface)) {
1247
1248                 printk(KERN_NOTICE PREFIX
1249                         "BIOS _OSI(Linux) query %s%s\n",
1250                         osi_linux.enable ? "honored" : "ignored",
1251                         osi_linux.cmdline ? " via cmdline" :
1252                         osi_linux.dmi ? " via DMI" : "");
1253
1254                 if (!osi_linux.dmi) {
1255                         if (acpi_dmi_dump())
1256                                 printk(KERN_NOTICE PREFIX
1257                                         "[please extract dmidecode output]\n");
1258                         printk(KERN_NOTICE PREFIX
1259                                 "Please send DMI info above to "
1260                                 "linux-acpi@vger.kernel.org\n");
1261                 }
1262                 if (!osi_linux.known && !osi_linux.cmdline) {
1263                         printk(KERN_NOTICE PREFIX
1264                                 "If \"acpi_osi=%sLinux\" works better, "
1265                                 "please notify linux-acpi@vger.kernel.org\n",
1266                                 osi_linux.enable ? "!" : "");
1267                 }
1268
1269                 if (osi_linux.enable)
1270                         return AE_OK;
1271         }
1272         return AE_SUPPORT;
1273 }
1274
1275 /******************************************************************************
1276  *
1277  * FUNCTION:    acpi_os_validate_address
1278  *
1279  * PARAMETERS:  space_id             - ACPI space ID
1280  *              address             - Physical address
1281  *              length              - Address length
1282  *
1283  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1284  *              should return AE_AML_ILLEGAL_ADDRESS.
1285  *
1286  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1287  *              the addresses accessed by AML operation regions.
1288  *
1289  *****************************************************************************/
1290
1291 acpi_status
1292 acpi_os_validate_address (
1293     u8                   space_id,
1294     acpi_physical_address   address,
1295     acpi_size               length)
1296 {
1297
1298     return AE_OK;
1299 }
1300
1301 #endif