1 /* 2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $) 3 * 4 * Copyright (C) 2000 Andrew Henroid 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * Copyright (c) 2008 Intel Corporation 8 * Author: Matthew Wilcox <willy@linux.intel.com> 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 27 * 28 */ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/slab.h> 33 #include <linux/mm.h> 34 #include <linux/pci.h> 35 #include <linux/interrupt.h> 36 #include <linux/kmod.h> 37 #include <linux/delay.h> 38 #include <linux/workqueue.h> 39 #include <linux/nmi.h> 40 #include <linux/acpi.h> 41 #include <linux/efi.h> 42 #include <linux/ioport.h> 43 #include <linux/list.h> 44 #include <linux/jiffies.h> 45 #include <linux/semaphore.h> 46 47 #include <asm/io.h> 48 #include <asm/uaccess.h> 49 50 #include <acpi/acpi.h> 51 #include <acpi/acpi_bus.h> 52 #include <acpi/processor.h> 53 54 #define _COMPONENT ACPI_OS_SERVICES 55 ACPI_MODULE_NAME("osl"); 56 #define PREFIX "ACPI: " 57 struct acpi_os_dpc { 58 acpi_osd_exec_callback function; 59 void *context; 60 struct work_struct work; 61 }; 62 63 #ifdef CONFIG_ACPI_CUSTOM_DSDT 64 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 65 #endif 66 67 #ifdef ENABLE_DEBUGGER 68 #include <linux/kdb.h> 69 70 /* stuff for debugger support */ 71 int acpi_in_debugger; 72 EXPORT_SYMBOL(acpi_in_debugger); 73 74 extern char line_buf[80]; 75 #endif /*ENABLE_DEBUGGER */ 76 77 static unsigned int acpi_irq_irq; 78 static acpi_osd_handler acpi_irq_handler; 79 static void *acpi_irq_context; 80 static struct workqueue_struct *kacpid_wq; 81 static struct workqueue_struct *kacpi_notify_wq; 82 83 struct acpi_res_list { 84 resource_size_t start; 85 resource_size_t end; 86 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/ 87 char name[5]; /* only can have a length of 4 chars, make use of this 88 one instead of res->name, no need to kalloc then */ 89 struct list_head resource_list; 90 }; 91 92 static LIST_HEAD(resource_list_head); 93 static DEFINE_SPINLOCK(acpi_res_lock); 94 95 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 96 static char osi_additional_string[OSI_STRING_LENGTH_MAX]; 97 98 /* 99 * The story of _OSI(Linux) 100 * 101 * From pre-history through Linux-2.6.22, 102 * Linux responded TRUE upon a BIOS OSI(Linux) query. 103 * 104 * Unfortunately, reference BIOS writers got wind of this 105 * and put OSI(Linux) in their example code, quickly exposing 106 * this string as ill-conceived and opening the door to 107 * an un-bounded number of BIOS incompatibilities. 108 * 109 * For example, OSI(Linux) was used on resume to re-POST a 110 * video card on one system, because Linux at that time 111 * could not do a speedy restore in its native driver. 112 * But then upon gaining quick native restore capability, 113 * Linux has no way to tell the BIOS to skip the time-consuming 114 * POST -- putting Linux at a permanent performance disadvantage. 115 * On another system, the BIOS writer used OSI(Linux) 116 * to infer native OS support for IPMI! On other systems, 117 * OSI(Linux) simply got in the way of Linux claiming to 118 * be compatible with other operating systems, exposing 119 * BIOS issues such as skipped device initialization. 120 * 121 * So "Linux" turned out to be a really poor chose of 122 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 123 * 124 * BIOS writers should NOT query _OSI(Linux) on future systems. 125 * Linux will complain on the console when it sees it, and return FALSE. 126 * To get Linux to return TRUE for your system will require 127 * a kernel source update to add a DMI entry, 128 * or boot with "acpi_osi=Linux" 129 */ 130 131 static struct osi_linux { 132 unsigned int enable:1; 133 unsigned int dmi:1; 134 unsigned int cmdline:1; 135 unsigned int known:1; 136 } osi_linux = { 0, 0, 0, 0}; 137 138 static void __init acpi_request_region (struct acpi_generic_address *addr, 139 unsigned int length, char *desc) 140 { 141 struct resource *res; 142 143 if (!addr->address || !length) 144 return; 145 146 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 147 res = request_region(addr->address, length, desc); 148 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 149 res = request_mem_region(addr->address, length, desc); 150 } 151 152 static int __init acpi_reserve_resources(void) 153 { 154 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 155 "ACPI PM1a_EVT_BLK"); 156 157 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 158 "ACPI PM1b_EVT_BLK"); 159 160 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 161 "ACPI PM1a_CNT_BLK"); 162 163 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 164 "ACPI PM1b_CNT_BLK"); 165 166 if (acpi_gbl_FADT.pm_timer_length == 4) 167 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 168 169 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 170 "ACPI PM2_CNT_BLK"); 171 172 /* Length of GPE blocks must be a non-negative multiple of 2 */ 173 174 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 175 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 176 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 177 178 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 179 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 180 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 181 182 return 0; 183 } 184 device_initcall(acpi_reserve_resources); 185 186 acpi_status __init acpi_os_initialize(void) 187 { 188 return AE_OK; 189 } 190 191 acpi_status acpi_os_initialize1(void) 192 { 193 kacpid_wq = create_singlethread_workqueue("kacpid"); 194 kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify"); 195 BUG_ON(!kacpid_wq); 196 BUG_ON(!kacpi_notify_wq); 197 return AE_OK; 198 } 199 200 acpi_status acpi_os_terminate(void) 201 { 202 if (acpi_irq_handler) { 203 acpi_os_remove_interrupt_handler(acpi_irq_irq, 204 acpi_irq_handler); 205 } 206 207 destroy_workqueue(kacpid_wq); 208 destroy_workqueue(kacpi_notify_wq); 209 210 return AE_OK; 211 } 212 213 void acpi_os_printf(const char *fmt, ...) 214 { 215 va_list args; 216 va_start(args, fmt); 217 acpi_os_vprintf(fmt, args); 218 va_end(args); 219 } 220 221 void acpi_os_vprintf(const char *fmt, va_list args) 222 { 223 static char buffer[512]; 224 225 vsprintf(buffer, fmt, args); 226 227 #ifdef ENABLE_DEBUGGER 228 if (acpi_in_debugger) { 229 kdb_printf("%s", buffer); 230 } else { 231 printk(KERN_CONT "%s", buffer); 232 } 233 #else 234 printk(KERN_CONT "%s", buffer); 235 #endif 236 } 237 238 acpi_physical_address __init acpi_os_get_root_pointer(void) 239 { 240 if (efi_enabled) { 241 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 242 return efi.acpi20; 243 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 244 return efi.acpi; 245 else { 246 printk(KERN_ERR PREFIX 247 "System description tables not found\n"); 248 return 0; 249 } 250 } else { 251 acpi_physical_address pa = 0; 252 253 acpi_find_root_pointer(&pa); 254 return pa; 255 } 256 } 257 258 void __iomem *__init_refok 259 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 260 { 261 if (phys > ULONG_MAX) { 262 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 263 return NULL; 264 } 265 if (acpi_gbl_permanent_mmap) 266 /* 267 * ioremap checks to ensure this is in reserved space 268 */ 269 return ioremap((unsigned long)phys, size); 270 else 271 return __acpi_map_table((unsigned long)phys, size); 272 } 273 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 274 275 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 276 { 277 if (acpi_gbl_permanent_mmap) 278 iounmap(virt); 279 else 280 __acpi_unmap_table(virt, size); 281 } 282 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 283 284 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 285 { 286 if (!acpi_gbl_permanent_mmap) 287 __acpi_unmap_table(virt, size); 288 } 289 290 #ifdef ACPI_FUTURE_USAGE 291 acpi_status 292 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 293 { 294 if (!phys || !virt) 295 return AE_BAD_PARAMETER; 296 297 *phys = virt_to_phys(virt); 298 299 return AE_OK; 300 } 301 #endif 302 303 #define ACPI_MAX_OVERRIDE_LEN 100 304 305 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 306 307 acpi_status 308 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 309 acpi_string * new_val) 310 { 311 if (!init_val || !new_val) 312 return AE_BAD_PARAMETER; 313 314 *new_val = NULL; 315 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 316 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 317 acpi_os_name); 318 *new_val = acpi_os_name; 319 } 320 321 return AE_OK; 322 } 323 324 acpi_status 325 acpi_os_table_override(struct acpi_table_header * existing_table, 326 struct acpi_table_header ** new_table) 327 { 328 if (!existing_table || !new_table) 329 return AE_BAD_PARAMETER; 330 331 *new_table = NULL; 332 333 #ifdef CONFIG_ACPI_CUSTOM_DSDT 334 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 335 *new_table = (struct acpi_table_header *)AmlCode; 336 #endif 337 if (*new_table != NULL) { 338 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 339 "this is unsafe: tainting kernel\n", 340 existing_table->signature, 341 existing_table->oem_table_id); 342 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 343 } 344 return AE_OK; 345 } 346 347 static irqreturn_t acpi_irq(int irq, void *dev_id) 348 { 349 u32 handled; 350 351 handled = (*acpi_irq_handler) (acpi_irq_context); 352 353 if (handled) { 354 acpi_irq_handled++; 355 return IRQ_HANDLED; 356 } else { 357 acpi_irq_not_handled++; 358 return IRQ_NONE; 359 } 360 } 361 362 acpi_status 363 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 364 void *context) 365 { 366 unsigned int irq; 367 368 acpi_irq_stats_init(); 369 370 /* 371 * Ignore the GSI from the core, and use the value in our copy of the 372 * FADT. It may not be the same if an interrupt source override exists 373 * for the SCI. 374 */ 375 gsi = acpi_gbl_FADT.sci_interrupt; 376 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 377 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 378 gsi); 379 return AE_OK; 380 } 381 382 acpi_irq_handler = handler; 383 acpi_irq_context = context; 384 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 385 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 386 return AE_NOT_ACQUIRED; 387 } 388 acpi_irq_irq = irq; 389 390 return AE_OK; 391 } 392 393 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 394 { 395 if (irq) { 396 free_irq(irq, acpi_irq); 397 acpi_irq_handler = NULL; 398 acpi_irq_irq = 0; 399 } 400 401 return AE_OK; 402 } 403 404 /* 405 * Running in interpreter thread context, safe to sleep 406 */ 407 408 void acpi_os_sleep(acpi_integer ms) 409 { 410 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 411 } 412 413 void acpi_os_stall(u32 us) 414 { 415 while (us) { 416 u32 delay = 1000; 417 418 if (delay > us) 419 delay = us; 420 udelay(delay); 421 touch_nmi_watchdog(); 422 us -= delay; 423 } 424 } 425 426 /* 427 * Support ACPI 3.0 AML Timer operand 428 * Returns 64-bit free-running, monotonically increasing timer 429 * with 100ns granularity 430 */ 431 u64 acpi_os_get_timer(void) 432 { 433 static u64 t; 434 435 #ifdef CONFIG_HPET 436 /* TBD: use HPET if available */ 437 #endif 438 439 #ifdef CONFIG_X86_PM_TIMER 440 /* TBD: default to PM timer if HPET was not available */ 441 #endif 442 if (!t) 443 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 444 445 return ++t; 446 } 447 448 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 449 { 450 u32 dummy; 451 452 if (!value) 453 value = &dummy; 454 455 *value = 0; 456 if (width <= 8) { 457 *(u8 *) value = inb(port); 458 } else if (width <= 16) { 459 *(u16 *) value = inw(port); 460 } else if (width <= 32) { 461 *(u32 *) value = inl(port); 462 } else { 463 BUG(); 464 } 465 466 return AE_OK; 467 } 468 469 EXPORT_SYMBOL(acpi_os_read_port); 470 471 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 472 { 473 if (width <= 8) { 474 outb(value, port); 475 } else if (width <= 16) { 476 outw(value, port); 477 } else if (width <= 32) { 478 outl(value, port); 479 } else { 480 BUG(); 481 } 482 483 return AE_OK; 484 } 485 486 EXPORT_SYMBOL(acpi_os_write_port); 487 488 acpi_status 489 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 490 { 491 u32 dummy; 492 void __iomem *virt_addr; 493 494 virt_addr = ioremap(phys_addr, width); 495 if (!value) 496 value = &dummy; 497 498 switch (width) { 499 case 8: 500 *(u8 *) value = readb(virt_addr); 501 break; 502 case 16: 503 *(u16 *) value = readw(virt_addr); 504 break; 505 case 32: 506 *(u32 *) value = readl(virt_addr); 507 break; 508 default: 509 BUG(); 510 } 511 512 iounmap(virt_addr); 513 514 return AE_OK; 515 } 516 517 acpi_status 518 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 519 { 520 void __iomem *virt_addr; 521 522 virt_addr = ioremap(phys_addr, width); 523 524 switch (width) { 525 case 8: 526 writeb(value, virt_addr); 527 break; 528 case 16: 529 writew(value, virt_addr); 530 break; 531 case 32: 532 writel(value, virt_addr); 533 break; 534 default: 535 BUG(); 536 } 537 538 iounmap(virt_addr); 539 540 return AE_OK; 541 } 542 543 acpi_status 544 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 545 u32 *value, u32 width) 546 { 547 int result, size; 548 549 if (!value) 550 return AE_BAD_PARAMETER; 551 552 switch (width) { 553 case 8: 554 size = 1; 555 break; 556 case 16: 557 size = 2; 558 break; 559 case 32: 560 size = 4; 561 break; 562 default: 563 return AE_ERROR; 564 } 565 566 result = raw_pci_read(pci_id->segment, pci_id->bus, 567 PCI_DEVFN(pci_id->device, pci_id->function), 568 reg, size, value); 569 570 return (result ? AE_ERROR : AE_OK); 571 } 572 573 acpi_status 574 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 575 acpi_integer value, u32 width) 576 { 577 int result, size; 578 579 switch (width) { 580 case 8: 581 size = 1; 582 break; 583 case 16: 584 size = 2; 585 break; 586 case 32: 587 size = 4; 588 break; 589 default: 590 return AE_ERROR; 591 } 592 593 result = raw_pci_write(pci_id->segment, pci_id->bus, 594 PCI_DEVFN(pci_id->device, pci_id->function), 595 reg, size, value); 596 597 return (result ? AE_ERROR : AE_OK); 598 } 599 600 /* TODO: Change code to take advantage of driver model more */ 601 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */ 602 acpi_handle chandle, /* current node */ 603 struct acpi_pci_id **id, 604 int *is_bridge, u8 * bus_number) 605 { 606 acpi_handle handle; 607 struct acpi_pci_id *pci_id = *id; 608 acpi_status status; 609 unsigned long long temp; 610 acpi_object_type type; 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 = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, 622 &temp); 623 if (ACPI_SUCCESS(status)) { 624 u32 val; 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, &val, 634 8); 635 if (ACPI_SUCCESS(status) 636 && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) { 637 status = 638 acpi_os_read_pci_configuration(pci_id, 0x18, 639 &val, 8); 640 if (!ACPI_SUCCESS(status)) { 641 /* Certainly broken... FIX ME */ 642 return; 643 } 644 *is_bridge = 1; 645 pci_id->bus = val; 646 status = 647 acpi_os_read_pci_configuration(pci_id, 0x19, 648 &val, 8); 649 if (ACPI_SUCCESS(status)) { 650 *bus_number = val; 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 static void acpi_os_execute_hp_deferred(struct work_struct *work) 683 { 684 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 685 if (!dpc) { 686 printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); 687 return; 688 } 689 690 acpi_os_wait_events_complete(NULL); 691 692 dpc->function(dpc->context); 693 kfree(dpc); 694 695 return; 696 } 697 698 /******************************************************************************* 699 * 700 * FUNCTION: acpi_os_execute 701 * 702 * PARAMETERS: Type - Type of the callback 703 * Function - Function to be executed 704 * Context - Function parameters 705 * 706 * RETURN: Status 707 * 708 * DESCRIPTION: Depending on type, either queues function for deferred execution or 709 * immediately executes function on a separate thread. 710 * 711 ******************************************************************************/ 712 713 static acpi_status __acpi_os_execute(acpi_execute_type type, 714 acpi_osd_exec_callback function, void *context, int hp) 715 { 716 acpi_status status = AE_OK; 717 struct acpi_os_dpc *dpc; 718 struct workqueue_struct *queue; 719 int ret; 720 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 721 "Scheduling function [%p(%p)] for deferred execution.\n", 722 function, context)); 723 724 if (!function) 725 return AE_BAD_PARAMETER; 726 727 /* 728 * Allocate/initialize DPC structure. Note that this memory will be 729 * freed by the callee. The kernel handles the work_struct list in a 730 * way that allows us to also free its memory inside the callee. 731 * Because we may want to schedule several tasks with different 732 * parameters we can't use the approach some kernel code uses of 733 * having a static work_struct. 734 */ 735 736 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 737 if (!dpc) 738 return AE_NO_MEMORY; 739 740 dpc->function = function; 741 dpc->context = context; 742 743 if (!hp) { 744 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 745 queue = (type == OSL_NOTIFY_HANDLER) ? 746 kacpi_notify_wq : kacpid_wq; 747 ret = queue_work(queue, &dpc->work); 748 } else { 749 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred); 750 ret = schedule_work(&dpc->work); 751 } 752 753 if (!ret) { 754 printk(KERN_ERR PREFIX 755 "Call to queue_work() failed.\n"); 756 status = AE_ERROR; 757 kfree(dpc); 758 } 759 return status; 760 } 761 762 acpi_status acpi_os_execute(acpi_execute_type type, 763 acpi_osd_exec_callback function, void *context) 764 { 765 return __acpi_os_execute(type, function, context, 0); 766 } 767 EXPORT_SYMBOL(acpi_os_execute); 768 769 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function, 770 void *context) 771 { 772 return __acpi_os_execute(0, function, context, 1); 773 } 774 775 void acpi_os_wait_events_complete(void *context) 776 { 777 flush_workqueue(kacpid_wq); 778 flush_workqueue(kacpi_notify_wq); 779 } 780 781 EXPORT_SYMBOL(acpi_os_wait_events_complete); 782 783 /* 784 * Allocate the memory for a spinlock and initialize it. 785 */ 786 acpi_status acpi_os_create_lock(acpi_spinlock * handle) 787 { 788 spin_lock_init(*handle); 789 790 return AE_OK; 791 } 792 793 /* 794 * Deallocate the memory for a spinlock. 795 */ 796 void acpi_os_delete_lock(acpi_spinlock handle) 797 { 798 return; 799 } 800 801 acpi_status 802 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 803 { 804 struct semaphore *sem = NULL; 805 806 sem = acpi_os_allocate(sizeof(struct semaphore)); 807 if (!sem) 808 return AE_NO_MEMORY; 809 memset(sem, 0, sizeof(struct semaphore)); 810 811 sema_init(sem, initial_units); 812 813 *handle = (acpi_handle *) sem; 814 815 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 816 *handle, initial_units)); 817 818 return AE_OK; 819 } 820 821 /* 822 * TODO: A better way to delete semaphores? Linux doesn't have a 823 * 'delete_semaphore()' function -- may result in an invalid 824 * pointer dereference for non-synchronized consumers. Should 825 * we at least check for blocked threads and signal/cancel them? 826 */ 827 828 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 829 { 830 struct semaphore *sem = (struct semaphore *)handle; 831 832 if (!sem) 833 return AE_BAD_PARAMETER; 834 835 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 836 837 BUG_ON(!list_empty(&sem->wait_list)); 838 kfree(sem); 839 sem = NULL; 840 841 return AE_OK; 842 } 843 844 /* 845 * TODO: Support for units > 1? 846 */ 847 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 848 { 849 acpi_status status = AE_OK; 850 struct semaphore *sem = (struct semaphore *)handle; 851 long jiffies; 852 int ret = 0; 853 854 if (!sem || (units < 1)) 855 return AE_BAD_PARAMETER; 856 857 if (units > 1) 858 return AE_SUPPORT; 859 860 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 861 handle, units, timeout)); 862 863 if (timeout == ACPI_WAIT_FOREVER) 864 jiffies = MAX_SCHEDULE_TIMEOUT; 865 else 866 jiffies = msecs_to_jiffies(timeout); 867 868 ret = down_timeout(sem, jiffies); 869 if (ret) 870 status = AE_TIME; 871 872 if (ACPI_FAILURE(status)) { 873 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 874 "Failed to acquire semaphore[%p|%d|%d], %s", 875 handle, units, timeout, 876 acpi_format_exception(status))); 877 } else { 878 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 879 "Acquired semaphore[%p|%d|%d]", handle, 880 units, timeout)); 881 } 882 883 return status; 884 } 885 886 /* 887 * TODO: Support for units > 1? 888 */ 889 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 890 { 891 struct semaphore *sem = (struct semaphore *)handle; 892 893 if (!sem || (units < 1)) 894 return AE_BAD_PARAMETER; 895 896 if (units > 1) 897 return AE_SUPPORT; 898 899 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 900 units)); 901 902 up(sem); 903 904 return AE_OK; 905 } 906 907 #ifdef ACPI_FUTURE_USAGE 908 u32 acpi_os_get_line(char *buffer) 909 { 910 911 #ifdef ENABLE_DEBUGGER 912 if (acpi_in_debugger) { 913 u32 chars; 914 915 kdb_read(buffer, sizeof(line_buf)); 916 917 /* remove the CR kdb includes */ 918 chars = strlen(buffer) - 1; 919 buffer[chars] = '\0'; 920 } 921 #endif 922 923 return 0; 924 } 925 #endif /* ACPI_FUTURE_USAGE */ 926 927 acpi_status acpi_os_signal(u32 function, void *info) 928 { 929 switch (function) { 930 case ACPI_SIGNAL_FATAL: 931 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 932 break; 933 case ACPI_SIGNAL_BREAKPOINT: 934 /* 935 * AML Breakpoint 936 * ACPI spec. says to treat it as a NOP unless 937 * you are debugging. So if/when we integrate 938 * AML debugger into the kernel debugger its 939 * hook will go here. But until then it is 940 * not useful to print anything on breakpoints. 941 */ 942 break; 943 default: 944 break; 945 } 946 947 return AE_OK; 948 } 949 950 static int __init acpi_os_name_setup(char *str) 951 { 952 char *p = acpi_os_name; 953 int count = ACPI_MAX_OVERRIDE_LEN - 1; 954 955 if (!str || !*str) 956 return 0; 957 958 for (; count-- && str && *str; str++) { 959 if (isalnum(*str) || *str == ' ' || *str == ':') 960 *p++ = *str; 961 else if (*str == '\'' || *str == '"') 962 continue; 963 else 964 break; 965 } 966 *p = 0; 967 968 return 1; 969 970 } 971 972 __setup("acpi_os_name=", acpi_os_name_setup); 973 974 static void __init set_osi_linux(unsigned int enable) 975 { 976 if (osi_linux.enable != enable) { 977 osi_linux.enable = enable; 978 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n", 979 enable ? "Add": "Delet"); 980 } 981 return; 982 } 983 984 static void __init acpi_cmdline_osi_linux(unsigned int enable) 985 { 986 osi_linux.cmdline = 1; /* cmdline set the default */ 987 set_osi_linux(enable); 988 989 return; 990 } 991 992 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 993 { 994 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 995 996 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 997 998 if (enable == -1) 999 return; 1000 1001 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */ 1002 1003 set_osi_linux(enable); 1004 1005 return; 1006 } 1007 1008 /* 1009 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1010 * 1011 * empty string disables _OSI 1012 * string starting with '!' disables that string 1013 * otherwise string is added to list, augmenting built-in strings 1014 */ 1015 int __init acpi_osi_setup(char *str) 1016 { 1017 if (str == NULL || *str == '\0') { 1018 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1019 acpi_gbl_create_osi_method = FALSE; 1020 } else if (!strcmp("!Linux", str)) { 1021 acpi_cmdline_osi_linux(0); /* !enable */ 1022 } else if (*str == '!') { 1023 if (acpi_osi_invalidate(++str) == AE_OK) 1024 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1025 } else if (!strcmp("Linux", str)) { 1026 acpi_cmdline_osi_linux(1); /* enable */ 1027 } else if (*osi_additional_string == '\0') { 1028 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX); 1029 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1030 } 1031 1032 return 1; 1033 } 1034 1035 __setup("acpi_osi=", acpi_osi_setup); 1036 1037 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1038 static int __init acpi_serialize_setup(char *str) 1039 { 1040 printk(KERN_INFO PREFIX "serialize enabled\n"); 1041 1042 acpi_gbl_all_methods_serialized = TRUE; 1043 1044 return 1; 1045 } 1046 1047 __setup("acpi_serialize", acpi_serialize_setup); 1048 1049 /* 1050 * Wake and Run-Time GPES are expected to be separate. 1051 * We disable wake-GPEs at run-time to prevent spurious 1052 * interrupts. 1053 * 1054 * However, if a system exists that shares Wake and 1055 * Run-time events on the same GPE this flag is available 1056 * to tell Linux to keep the wake-time GPEs enabled at run-time. 1057 */ 1058 static int __init acpi_wake_gpes_always_on_setup(char *str) 1059 { 1060 printk(KERN_INFO PREFIX "wake GPEs not disabled\n"); 1061 1062 acpi_gbl_leave_wake_gpes_disabled = FALSE; 1063 1064 return 1; 1065 } 1066 1067 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup); 1068 1069 /* Check of resource interference between native drivers and ACPI 1070 * OperationRegions (SystemIO and System Memory only). 1071 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1072 * in arbitrary AML code and can interfere with legacy drivers. 1073 * acpi_enforce_resources= can be set to: 1074 * 1075 * - strict (default) (2) 1076 * -> further driver trying to access the resources will not load 1077 * - lax (1) 1078 * -> further driver trying to access the resources will load, but you 1079 * get a system message that something might go wrong... 1080 * 1081 * - no (0) 1082 * -> ACPI Operation Region resources will not be registered 1083 * 1084 */ 1085 #define ENFORCE_RESOURCES_STRICT 2 1086 #define ENFORCE_RESOURCES_LAX 1 1087 #define ENFORCE_RESOURCES_NO 0 1088 1089 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1090 1091 static int __init acpi_enforce_resources_setup(char *str) 1092 { 1093 if (str == NULL || *str == '\0') 1094 return 0; 1095 1096 if (!strcmp("strict", str)) 1097 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1098 else if (!strcmp("lax", str)) 1099 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1100 else if (!strcmp("no", str)) 1101 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1102 1103 return 1; 1104 } 1105 1106 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1107 1108 /* Check for resource conflicts between ACPI OperationRegions and native 1109 * drivers */ 1110 int acpi_check_resource_conflict(struct resource *res) 1111 { 1112 struct acpi_res_list *res_list_elem; 1113 int ioport; 1114 int clash = 0; 1115 1116 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1117 return 0; 1118 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1119 return 0; 1120 1121 ioport = res->flags & IORESOURCE_IO; 1122 1123 spin_lock(&acpi_res_lock); 1124 list_for_each_entry(res_list_elem, &resource_list_head, 1125 resource_list) { 1126 if (ioport && (res_list_elem->resource_type 1127 != ACPI_ADR_SPACE_SYSTEM_IO)) 1128 continue; 1129 if (!ioport && (res_list_elem->resource_type 1130 != ACPI_ADR_SPACE_SYSTEM_MEMORY)) 1131 continue; 1132 1133 if (res->end < res_list_elem->start 1134 || res_list_elem->end < res->start) 1135 continue; 1136 clash = 1; 1137 break; 1138 } 1139 spin_unlock(&acpi_res_lock); 1140 1141 if (clash) { 1142 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1143 printk("%sACPI: %s resource %s [0x%llx-0x%llx]" 1144 " conflicts with ACPI region %s" 1145 " [0x%llx-0x%llx]\n", 1146 acpi_enforce_resources == ENFORCE_RESOURCES_LAX 1147 ? KERN_WARNING : KERN_ERR, 1148 ioport ? "I/O" : "Memory", res->name, 1149 (long long) res->start, (long long) res->end, 1150 res_list_elem->name, 1151 (long long) res_list_elem->start, 1152 (long long) res_list_elem->end); 1153 printk(KERN_INFO "ACPI: Device needs an ACPI driver\n"); 1154 } 1155 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1156 return -EBUSY; 1157 } 1158 return 0; 1159 } 1160 EXPORT_SYMBOL(acpi_check_resource_conflict); 1161 1162 int acpi_check_region(resource_size_t start, resource_size_t n, 1163 const char *name) 1164 { 1165 struct resource res = { 1166 .start = start, 1167 .end = start + n - 1, 1168 .name = name, 1169 .flags = IORESOURCE_IO, 1170 }; 1171 1172 return acpi_check_resource_conflict(&res); 1173 } 1174 EXPORT_SYMBOL(acpi_check_region); 1175 1176 int acpi_check_mem_region(resource_size_t start, resource_size_t n, 1177 const char *name) 1178 { 1179 struct resource res = { 1180 .start = start, 1181 .end = start + n - 1, 1182 .name = name, 1183 .flags = IORESOURCE_MEM, 1184 }; 1185 1186 return acpi_check_resource_conflict(&res); 1187 1188 } 1189 EXPORT_SYMBOL(acpi_check_mem_region); 1190 1191 /* 1192 * Acquire a spinlock. 1193 * 1194 * handle is a pointer to the spinlock_t. 1195 */ 1196 1197 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1198 { 1199 acpi_cpu_flags flags; 1200 spin_lock_irqsave(lockp, flags); 1201 return flags; 1202 } 1203 1204 /* 1205 * Release a spinlock. See above. 1206 */ 1207 1208 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1209 { 1210 spin_unlock_irqrestore(lockp, flags); 1211 } 1212 1213 #ifndef ACPI_USE_LOCAL_CACHE 1214 1215 /******************************************************************************* 1216 * 1217 * FUNCTION: acpi_os_create_cache 1218 * 1219 * PARAMETERS: name - Ascii name for the cache 1220 * size - Size of each cached object 1221 * depth - Maximum depth of the cache (in objects) <ignored> 1222 * cache - Where the new cache object is returned 1223 * 1224 * RETURN: status 1225 * 1226 * DESCRIPTION: Create a cache object 1227 * 1228 ******************************************************************************/ 1229 1230 acpi_status 1231 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1232 { 1233 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1234 if (*cache == NULL) 1235 return AE_ERROR; 1236 else 1237 return AE_OK; 1238 } 1239 1240 /******************************************************************************* 1241 * 1242 * FUNCTION: acpi_os_purge_cache 1243 * 1244 * PARAMETERS: Cache - Handle to cache object 1245 * 1246 * RETURN: Status 1247 * 1248 * DESCRIPTION: Free all objects within the requested cache. 1249 * 1250 ******************************************************************************/ 1251 1252 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1253 { 1254 kmem_cache_shrink(cache); 1255 return (AE_OK); 1256 } 1257 1258 /******************************************************************************* 1259 * 1260 * FUNCTION: acpi_os_delete_cache 1261 * 1262 * PARAMETERS: Cache - Handle to cache object 1263 * 1264 * RETURN: Status 1265 * 1266 * DESCRIPTION: Free all objects within the requested cache and delete the 1267 * cache object. 1268 * 1269 ******************************************************************************/ 1270 1271 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1272 { 1273 kmem_cache_destroy(cache); 1274 return (AE_OK); 1275 } 1276 1277 /******************************************************************************* 1278 * 1279 * FUNCTION: acpi_os_release_object 1280 * 1281 * PARAMETERS: Cache - Handle to cache object 1282 * Object - The object to be released 1283 * 1284 * RETURN: None 1285 * 1286 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1287 * the object is deleted. 1288 * 1289 ******************************************************************************/ 1290 1291 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1292 { 1293 kmem_cache_free(cache, object); 1294 return (AE_OK); 1295 } 1296 1297 /****************************************************************************** 1298 * 1299 * FUNCTION: acpi_os_validate_interface 1300 * 1301 * PARAMETERS: interface - Requested interface to be validated 1302 * 1303 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise 1304 * 1305 * DESCRIPTION: Match an interface string to the interfaces supported by the 1306 * host. Strings originate from an AML call to the _OSI method. 1307 * 1308 *****************************************************************************/ 1309 1310 acpi_status 1311 acpi_os_validate_interface (char *interface) 1312 { 1313 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX)) 1314 return AE_OK; 1315 if (!strcmp("Linux", interface)) { 1316 1317 printk(KERN_NOTICE PREFIX 1318 "BIOS _OSI(Linux) query %s%s\n", 1319 osi_linux.enable ? "honored" : "ignored", 1320 osi_linux.cmdline ? " via cmdline" : 1321 osi_linux.dmi ? " via DMI" : ""); 1322 1323 if (osi_linux.enable) 1324 return AE_OK; 1325 } 1326 return AE_SUPPORT; 1327 } 1328 1329 /****************************************************************************** 1330 * 1331 * FUNCTION: acpi_os_validate_address 1332 * 1333 * PARAMETERS: space_id - ACPI space ID 1334 * address - Physical address 1335 * length - Address length 1336 * 1337 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1338 * should return AE_AML_ILLEGAL_ADDRESS. 1339 * 1340 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1341 * the addresses accessed by AML operation regions. 1342 * 1343 *****************************************************************************/ 1344 1345 acpi_status 1346 acpi_os_validate_address ( 1347 u8 space_id, 1348 acpi_physical_address address, 1349 acpi_size length, 1350 char *name) 1351 { 1352 struct acpi_res_list *res; 1353 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1354 return AE_OK; 1355 1356 switch (space_id) { 1357 case ACPI_ADR_SPACE_SYSTEM_IO: 1358 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1359 /* Only interference checks against SystemIO and SytemMemory 1360 are needed */ 1361 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL); 1362 if (!res) 1363 return AE_OK; 1364 /* ACPI names are fixed to 4 bytes, still better use strlcpy */ 1365 strlcpy(res->name, name, 5); 1366 res->start = address; 1367 res->end = address + length - 1; 1368 res->resource_type = space_id; 1369 spin_lock(&acpi_res_lock); 1370 list_add(&res->resource_list, &resource_list_head); 1371 spin_unlock(&acpi_res_lock); 1372 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, " 1373 "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO) 1374 ? "SystemIO" : "System Memory", 1375 (unsigned long long)res->start, 1376 (unsigned long long)res->end, 1377 res->name); 1378 break; 1379 case ACPI_ADR_SPACE_PCI_CONFIG: 1380 case ACPI_ADR_SPACE_EC: 1381 case ACPI_ADR_SPACE_SMBUS: 1382 case ACPI_ADR_SPACE_CMOS: 1383 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1384 case ACPI_ADR_SPACE_DATA_TABLE: 1385 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1386 break; 1387 } 1388 return AE_OK; 1389 } 1390 1391 #endif 1392