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 int wait; 62 }; 63 64 #ifdef CONFIG_ACPI_CUSTOM_DSDT 65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 66 #endif 67 68 #ifdef ENABLE_DEBUGGER 69 #include <linux/kdb.h> 70 71 /* stuff for debugger support */ 72 int acpi_in_debugger; 73 EXPORT_SYMBOL(acpi_in_debugger); 74 75 extern char line_buf[80]; 76 #endif /*ENABLE_DEBUGGER */ 77 78 static unsigned int acpi_irq_irq; 79 static acpi_osd_handler acpi_irq_handler; 80 static void *acpi_irq_context; 81 static struct workqueue_struct *kacpid_wq; 82 static struct workqueue_struct *kacpi_notify_wq; 83 static struct workqueue_struct *kacpi_hotplug_wq; 84 85 struct acpi_res_list { 86 resource_size_t start; 87 resource_size_t end; 88 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/ 89 char name[5]; /* only can have a length of 4 chars, make use of this 90 one instead of res->name, no need to kalloc then */ 91 struct list_head resource_list; 92 int count; 93 }; 94 95 static LIST_HEAD(resource_list_head); 96 static DEFINE_SPINLOCK(acpi_res_lock); 97 98 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 99 static char osi_additional_string[OSI_STRING_LENGTH_MAX]; 100 101 /* 102 * The story of _OSI(Linux) 103 * 104 * From pre-history through Linux-2.6.22, 105 * Linux responded TRUE upon a BIOS OSI(Linux) query. 106 * 107 * Unfortunately, reference BIOS writers got wind of this 108 * and put OSI(Linux) in their example code, quickly exposing 109 * this string as ill-conceived and opening the door to 110 * an un-bounded number of BIOS incompatibilities. 111 * 112 * For example, OSI(Linux) was used on resume to re-POST a 113 * video card on one system, because Linux at that time 114 * could not do a speedy restore in its native driver. 115 * But then upon gaining quick native restore capability, 116 * Linux has no way to tell the BIOS to skip the time-consuming 117 * POST -- putting Linux at a permanent performance disadvantage. 118 * On another system, the BIOS writer used OSI(Linux) 119 * to infer native OS support for IPMI! On other systems, 120 * OSI(Linux) simply got in the way of Linux claiming to 121 * be compatible with other operating systems, exposing 122 * BIOS issues such as skipped device initialization. 123 * 124 * So "Linux" turned out to be a really poor chose of 125 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 126 * 127 * BIOS writers should NOT query _OSI(Linux) on future systems. 128 * Linux will complain on the console when it sees it, and return FALSE. 129 * To get Linux to return TRUE for your system will require 130 * a kernel source update to add a DMI entry, 131 * or boot with "acpi_osi=Linux" 132 */ 133 134 static struct osi_linux { 135 unsigned int enable:1; 136 unsigned int dmi:1; 137 unsigned int cmdline:1; 138 unsigned int known:1; 139 } osi_linux = { 0, 0, 0, 0}; 140 141 static void __init acpi_request_region (struct acpi_generic_address *addr, 142 unsigned int length, char *desc) 143 { 144 struct resource *res; 145 146 if (!addr->address || !length) 147 return; 148 149 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 150 res = request_region(addr->address, length, desc); 151 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 152 res = request_mem_region(addr->address, length, desc); 153 } 154 155 static int __init acpi_reserve_resources(void) 156 { 157 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 158 "ACPI PM1a_EVT_BLK"); 159 160 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 161 "ACPI PM1b_EVT_BLK"); 162 163 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 164 "ACPI PM1a_CNT_BLK"); 165 166 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 167 "ACPI PM1b_CNT_BLK"); 168 169 if (acpi_gbl_FADT.pm_timer_length == 4) 170 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 171 172 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 173 "ACPI PM2_CNT_BLK"); 174 175 /* Length of GPE blocks must be a non-negative multiple of 2 */ 176 177 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 178 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 179 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 180 181 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 182 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 183 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 184 185 return 0; 186 } 187 device_initcall(acpi_reserve_resources); 188 189 acpi_status __init acpi_os_initialize(void) 190 { 191 return AE_OK; 192 } 193 194 acpi_status acpi_os_initialize1(void) 195 { 196 kacpid_wq = create_workqueue("kacpid"); 197 kacpi_notify_wq = create_workqueue("kacpi_notify"); 198 kacpi_hotplug_wq = create_workqueue("kacpi_hotplug"); 199 BUG_ON(!kacpid_wq); 200 BUG_ON(!kacpi_notify_wq); 201 BUG_ON(!kacpi_hotplug_wq); 202 return AE_OK; 203 } 204 205 acpi_status acpi_os_terminate(void) 206 { 207 if (acpi_irq_handler) { 208 acpi_os_remove_interrupt_handler(acpi_irq_irq, 209 acpi_irq_handler); 210 } 211 212 destroy_workqueue(kacpid_wq); 213 destroy_workqueue(kacpi_notify_wq); 214 destroy_workqueue(kacpi_hotplug_wq); 215 216 return AE_OK; 217 } 218 219 void acpi_os_printf(const char *fmt, ...) 220 { 221 va_list args; 222 va_start(args, fmt); 223 acpi_os_vprintf(fmt, args); 224 va_end(args); 225 } 226 227 void acpi_os_vprintf(const char *fmt, va_list args) 228 { 229 static char buffer[512]; 230 231 vsprintf(buffer, fmt, args); 232 233 #ifdef ENABLE_DEBUGGER 234 if (acpi_in_debugger) { 235 kdb_printf("%s", buffer); 236 } else { 237 printk(KERN_CONT "%s", buffer); 238 } 239 #else 240 printk(KERN_CONT "%s", buffer); 241 #endif 242 } 243 244 acpi_physical_address __init acpi_os_get_root_pointer(void) 245 { 246 if (efi_enabled) { 247 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 248 return efi.acpi20; 249 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 250 return efi.acpi; 251 else { 252 printk(KERN_ERR PREFIX 253 "System description tables not found\n"); 254 return 0; 255 } 256 } else { 257 acpi_physical_address pa = 0; 258 259 acpi_find_root_pointer(&pa); 260 return pa; 261 } 262 } 263 264 void __iomem *__init_refok 265 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 266 { 267 if (phys > ULONG_MAX) { 268 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 269 return NULL; 270 } 271 if (acpi_gbl_permanent_mmap) 272 /* 273 * ioremap checks to ensure this is in reserved space 274 */ 275 return ioremap((unsigned long)phys, size); 276 else 277 return __acpi_map_table((unsigned long)phys, size); 278 } 279 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 280 281 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 282 { 283 if (acpi_gbl_permanent_mmap) 284 iounmap(virt); 285 else 286 __acpi_unmap_table(virt, size); 287 } 288 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 289 290 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 291 { 292 if (!acpi_gbl_permanent_mmap) 293 __acpi_unmap_table(virt, size); 294 } 295 296 #ifdef ACPI_FUTURE_USAGE 297 acpi_status 298 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 299 { 300 if (!phys || !virt) 301 return AE_BAD_PARAMETER; 302 303 *phys = virt_to_phys(virt); 304 305 return AE_OK; 306 } 307 #endif 308 309 #define ACPI_MAX_OVERRIDE_LEN 100 310 311 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 312 313 acpi_status 314 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 315 acpi_string * new_val) 316 { 317 if (!init_val || !new_val) 318 return AE_BAD_PARAMETER; 319 320 *new_val = NULL; 321 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 322 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 323 acpi_os_name); 324 *new_val = acpi_os_name; 325 } 326 327 return AE_OK; 328 } 329 330 acpi_status 331 acpi_os_table_override(struct acpi_table_header * existing_table, 332 struct acpi_table_header ** new_table) 333 { 334 if (!existing_table || !new_table) 335 return AE_BAD_PARAMETER; 336 337 *new_table = NULL; 338 339 #ifdef CONFIG_ACPI_CUSTOM_DSDT 340 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 341 *new_table = (struct acpi_table_header *)AmlCode; 342 #endif 343 if (*new_table != NULL) { 344 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 345 "this is unsafe: tainting kernel\n", 346 existing_table->signature, 347 existing_table->oem_table_id); 348 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 349 } 350 return AE_OK; 351 } 352 353 static irqreturn_t acpi_irq(int irq, void *dev_id) 354 { 355 u32 handled; 356 357 handled = (*acpi_irq_handler) (acpi_irq_context); 358 359 if (handled) { 360 acpi_irq_handled++; 361 return IRQ_HANDLED; 362 } else { 363 acpi_irq_not_handled++; 364 return IRQ_NONE; 365 } 366 } 367 368 acpi_status 369 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 370 void *context) 371 { 372 unsigned int irq; 373 374 acpi_irq_stats_init(); 375 376 /* 377 * Ignore the GSI from the core, and use the value in our copy of the 378 * FADT. It may not be the same if an interrupt source override exists 379 * for the SCI. 380 */ 381 gsi = acpi_gbl_FADT.sci_interrupt; 382 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 383 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 384 gsi); 385 return AE_OK; 386 } 387 388 acpi_irq_handler = handler; 389 acpi_irq_context = context; 390 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 391 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 392 return AE_NOT_ACQUIRED; 393 } 394 acpi_irq_irq = irq; 395 396 return AE_OK; 397 } 398 399 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 400 { 401 if (irq) { 402 free_irq(irq, acpi_irq); 403 acpi_irq_handler = NULL; 404 acpi_irq_irq = 0; 405 } 406 407 return AE_OK; 408 } 409 410 /* 411 * Running in interpreter thread context, safe to sleep 412 */ 413 414 void acpi_os_sleep(u64 ms) 415 { 416 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 417 } 418 419 void acpi_os_stall(u32 us) 420 { 421 while (us) { 422 u32 delay = 1000; 423 424 if (delay > us) 425 delay = us; 426 udelay(delay); 427 touch_nmi_watchdog(); 428 us -= delay; 429 } 430 } 431 432 /* 433 * Support ACPI 3.0 AML Timer operand 434 * Returns 64-bit free-running, monotonically increasing timer 435 * with 100ns granularity 436 */ 437 u64 acpi_os_get_timer(void) 438 { 439 static u64 t; 440 441 #ifdef CONFIG_HPET 442 /* TBD: use HPET if available */ 443 #endif 444 445 #ifdef CONFIG_X86_PM_TIMER 446 /* TBD: default to PM timer if HPET was not available */ 447 #endif 448 if (!t) 449 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 450 451 return ++t; 452 } 453 454 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 455 { 456 u32 dummy; 457 458 if (!value) 459 value = &dummy; 460 461 *value = 0; 462 if (width <= 8) { 463 *(u8 *) value = inb(port); 464 } else if (width <= 16) { 465 *(u16 *) value = inw(port); 466 } else if (width <= 32) { 467 *(u32 *) value = inl(port); 468 } else { 469 BUG(); 470 } 471 472 return AE_OK; 473 } 474 475 EXPORT_SYMBOL(acpi_os_read_port); 476 477 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 478 { 479 if (width <= 8) { 480 outb(value, port); 481 } else if (width <= 16) { 482 outw(value, port); 483 } else if (width <= 32) { 484 outl(value, port); 485 } else { 486 BUG(); 487 } 488 489 return AE_OK; 490 } 491 492 EXPORT_SYMBOL(acpi_os_write_port); 493 494 acpi_status 495 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 496 { 497 u32 dummy; 498 void __iomem *virt_addr; 499 500 virt_addr = ioremap(phys_addr, width); 501 if (!value) 502 value = &dummy; 503 504 switch (width) { 505 case 8: 506 *(u8 *) value = readb(virt_addr); 507 break; 508 case 16: 509 *(u16 *) value = readw(virt_addr); 510 break; 511 case 32: 512 *(u32 *) value = readl(virt_addr); 513 break; 514 default: 515 BUG(); 516 } 517 518 iounmap(virt_addr); 519 520 return AE_OK; 521 } 522 523 acpi_status 524 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 525 { 526 void __iomem *virt_addr; 527 528 virt_addr = ioremap(phys_addr, width); 529 530 switch (width) { 531 case 8: 532 writeb(value, virt_addr); 533 break; 534 case 16: 535 writew(value, virt_addr); 536 break; 537 case 32: 538 writel(value, virt_addr); 539 break; 540 default: 541 BUG(); 542 } 543 544 iounmap(virt_addr); 545 546 return AE_OK; 547 } 548 549 acpi_status 550 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 551 u32 *value, u32 width) 552 { 553 int result, size; 554 555 if (!value) 556 return AE_BAD_PARAMETER; 557 558 switch (width) { 559 case 8: 560 size = 1; 561 break; 562 case 16: 563 size = 2; 564 break; 565 case 32: 566 size = 4; 567 break; 568 default: 569 return AE_ERROR; 570 } 571 572 result = raw_pci_read(pci_id->segment, pci_id->bus, 573 PCI_DEVFN(pci_id->device, pci_id->function), 574 reg, size, value); 575 576 return (result ? AE_ERROR : AE_OK); 577 } 578 579 acpi_status 580 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 581 u64 value, u32 width) 582 { 583 int result, size; 584 585 switch (width) { 586 case 8: 587 size = 1; 588 break; 589 case 16: 590 size = 2; 591 break; 592 case 32: 593 size = 4; 594 break; 595 default: 596 return AE_ERROR; 597 } 598 599 result = raw_pci_write(pci_id->segment, pci_id->bus, 600 PCI_DEVFN(pci_id->device, pci_id->function), 601 reg, size, value); 602 603 return (result ? AE_ERROR : AE_OK); 604 } 605 606 /* TODO: Change code to take advantage of driver model more */ 607 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */ 608 acpi_handle chandle, /* current node */ 609 struct acpi_pci_id **id, 610 int *is_bridge, u8 * bus_number) 611 { 612 acpi_handle handle; 613 struct acpi_pci_id *pci_id = *id; 614 acpi_status status; 615 unsigned long long temp; 616 acpi_object_type type; 617 618 acpi_get_parent(chandle, &handle); 619 if (handle != rhandle) { 620 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, 621 bus_number); 622 623 status = acpi_get_type(handle, &type); 624 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE)) 625 return; 626 627 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, 628 &temp); 629 if (ACPI_SUCCESS(status)) { 630 u32 val; 631 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp)); 632 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp)); 633 634 if (*is_bridge) 635 pci_id->bus = *bus_number; 636 637 /* any nicer way to get bus number of bridge ? */ 638 status = 639 acpi_os_read_pci_configuration(pci_id, 0x0e, &val, 640 8); 641 if (ACPI_SUCCESS(status) 642 && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) { 643 status = 644 acpi_os_read_pci_configuration(pci_id, 0x18, 645 &val, 8); 646 if (!ACPI_SUCCESS(status)) { 647 /* Certainly broken... FIX ME */ 648 return; 649 } 650 *is_bridge = 1; 651 pci_id->bus = val; 652 status = 653 acpi_os_read_pci_configuration(pci_id, 0x19, 654 &val, 8); 655 if (ACPI_SUCCESS(status)) { 656 *bus_number = val; 657 } 658 } else 659 *is_bridge = 0; 660 } 661 } 662 } 663 664 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */ 665 acpi_handle chandle, /* current node */ 666 struct acpi_pci_id **id) 667 { 668 int is_bridge = 1; 669 u8 bus_number = (*id)->bus; 670 671 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number); 672 } 673 674 static void acpi_os_execute_deferred(struct work_struct *work) 675 { 676 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 677 678 if (dpc->wait) 679 acpi_os_wait_events_complete(NULL); 680 681 dpc->function(dpc->context); 682 kfree(dpc); 683 } 684 685 /******************************************************************************* 686 * 687 * FUNCTION: acpi_os_execute 688 * 689 * PARAMETERS: Type - Type of the callback 690 * Function - Function to be executed 691 * Context - Function parameters 692 * 693 * RETURN: Status 694 * 695 * DESCRIPTION: Depending on type, either queues function for deferred execution or 696 * immediately executes function on a separate thread. 697 * 698 ******************************************************************************/ 699 700 static acpi_status __acpi_os_execute(acpi_execute_type type, 701 acpi_osd_exec_callback function, void *context, int hp) 702 { 703 acpi_status status = AE_OK; 704 struct acpi_os_dpc *dpc; 705 struct workqueue_struct *queue; 706 int ret; 707 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 708 "Scheduling function [%p(%p)] for deferred execution.\n", 709 function, context)); 710 711 /* 712 * Allocate/initialize DPC structure. Note that this memory will be 713 * freed by the callee. The kernel handles the work_struct list in a 714 * way that allows us to also free its memory inside the callee. 715 * Because we may want to schedule several tasks with different 716 * parameters we can't use the approach some kernel code uses of 717 * having a static work_struct. 718 */ 719 720 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 721 if (!dpc) 722 return AE_NO_MEMORY; 723 724 dpc->function = function; 725 dpc->context = context; 726 727 /* 728 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq 729 * because the hotplug code may call driver .remove() functions, 730 * which invoke flush_scheduled_work/acpi_os_wait_events_complete 731 * to flush these workqueues. 732 */ 733 queue = hp ? kacpi_hotplug_wq : 734 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); 735 dpc->wait = hp ? 1 : 0; 736 737 if (queue == kacpi_hotplug_wq) 738 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 739 else if (queue == kacpi_notify_wq) 740 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 741 else 742 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 743 744 /* 745 * On some machines, a software-initiated SMI causes corruption unless 746 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 747 * typically it's done in GPE-related methods that are run via 748 * workqueues, so we can avoid the known corruption cases by always 749 * queueing on CPU 0. 750 */ 751 ret = queue_work_on(0, queue, &dpc->work); 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 /* Check of resource interference between native drivers and ACPI 1050 * OperationRegions (SystemIO and System Memory only). 1051 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1052 * in arbitrary AML code and can interfere with legacy drivers. 1053 * acpi_enforce_resources= can be set to: 1054 * 1055 * - strict (default) (2) 1056 * -> further driver trying to access the resources will not load 1057 * - lax (1) 1058 * -> further driver trying to access the resources will load, but you 1059 * get a system message that something might go wrong... 1060 * 1061 * - no (0) 1062 * -> ACPI Operation Region resources will not be registered 1063 * 1064 */ 1065 #define ENFORCE_RESOURCES_STRICT 2 1066 #define ENFORCE_RESOURCES_LAX 1 1067 #define ENFORCE_RESOURCES_NO 0 1068 1069 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1070 1071 static int __init acpi_enforce_resources_setup(char *str) 1072 { 1073 if (str == NULL || *str == '\0') 1074 return 0; 1075 1076 if (!strcmp("strict", str)) 1077 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1078 else if (!strcmp("lax", str)) 1079 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1080 else if (!strcmp("no", str)) 1081 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1082 1083 return 1; 1084 } 1085 1086 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1087 1088 /* Check for resource conflicts between ACPI OperationRegions and native 1089 * drivers */ 1090 int acpi_check_resource_conflict(const struct resource *res) 1091 { 1092 struct acpi_res_list *res_list_elem; 1093 int ioport; 1094 int clash = 0; 1095 1096 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1097 return 0; 1098 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1099 return 0; 1100 1101 ioport = res->flags & IORESOURCE_IO; 1102 1103 spin_lock(&acpi_res_lock); 1104 list_for_each_entry(res_list_elem, &resource_list_head, 1105 resource_list) { 1106 if (ioport && (res_list_elem->resource_type 1107 != ACPI_ADR_SPACE_SYSTEM_IO)) 1108 continue; 1109 if (!ioport && (res_list_elem->resource_type 1110 != ACPI_ADR_SPACE_SYSTEM_MEMORY)) 1111 continue; 1112 1113 if (res->end < res_list_elem->start 1114 || res_list_elem->end < res->start) 1115 continue; 1116 clash = 1; 1117 break; 1118 } 1119 spin_unlock(&acpi_res_lock); 1120 1121 if (clash) { 1122 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1123 printk(KERN_WARNING "ACPI: resource %s %pR" 1124 " conflicts with ACPI region %s %pR\n", 1125 res->name, res, res_list_elem->name, 1126 res_list_elem); 1127 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1128 printk(KERN_NOTICE "ACPI: This conflict may" 1129 " cause random problems and system" 1130 " instability\n"); 1131 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1132 " for this device, you should use it instead of" 1133 " the native driver\n"); 1134 } 1135 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1136 return -EBUSY; 1137 } 1138 return 0; 1139 } 1140 EXPORT_SYMBOL(acpi_check_resource_conflict); 1141 1142 int acpi_check_region(resource_size_t start, resource_size_t n, 1143 const char *name) 1144 { 1145 struct resource res = { 1146 .start = start, 1147 .end = start + n - 1, 1148 .name = name, 1149 .flags = IORESOURCE_IO, 1150 }; 1151 1152 return acpi_check_resource_conflict(&res); 1153 } 1154 EXPORT_SYMBOL(acpi_check_region); 1155 1156 int acpi_check_mem_region(resource_size_t start, resource_size_t n, 1157 const char *name) 1158 { 1159 struct resource res = { 1160 .start = start, 1161 .end = start + n - 1, 1162 .name = name, 1163 .flags = IORESOURCE_MEM, 1164 }; 1165 1166 return acpi_check_resource_conflict(&res); 1167 1168 } 1169 EXPORT_SYMBOL(acpi_check_mem_region); 1170 1171 /* 1172 * Let drivers know whether the resource checks are effective 1173 */ 1174 int acpi_resources_are_enforced(void) 1175 { 1176 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1177 } 1178 EXPORT_SYMBOL(acpi_resources_are_enforced); 1179 1180 /* 1181 * Acquire a spinlock. 1182 * 1183 * handle is a pointer to the spinlock_t. 1184 */ 1185 1186 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1187 { 1188 acpi_cpu_flags flags; 1189 spin_lock_irqsave(lockp, flags); 1190 return flags; 1191 } 1192 1193 /* 1194 * Release a spinlock. See above. 1195 */ 1196 1197 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1198 { 1199 spin_unlock_irqrestore(lockp, flags); 1200 } 1201 1202 #ifndef ACPI_USE_LOCAL_CACHE 1203 1204 /******************************************************************************* 1205 * 1206 * FUNCTION: acpi_os_create_cache 1207 * 1208 * PARAMETERS: name - Ascii name for the cache 1209 * size - Size of each cached object 1210 * depth - Maximum depth of the cache (in objects) <ignored> 1211 * cache - Where the new cache object is returned 1212 * 1213 * RETURN: status 1214 * 1215 * DESCRIPTION: Create a cache object 1216 * 1217 ******************************************************************************/ 1218 1219 acpi_status 1220 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1221 { 1222 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1223 if (*cache == NULL) 1224 return AE_ERROR; 1225 else 1226 return AE_OK; 1227 } 1228 1229 /******************************************************************************* 1230 * 1231 * FUNCTION: acpi_os_purge_cache 1232 * 1233 * PARAMETERS: Cache - Handle to cache object 1234 * 1235 * RETURN: Status 1236 * 1237 * DESCRIPTION: Free all objects within the requested cache. 1238 * 1239 ******************************************************************************/ 1240 1241 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1242 { 1243 kmem_cache_shrink(cache); 1244 return (AE_OK); 1245 } 1246 1247 /******************************************************************************* 1248 * 1249 * FUNCTION: acpi_os_delete_cache 1250 * 1251 * PARAMETERS: Cache - Handle to cache object 1252 * 1253 * RETURN: Status 1254 * 1255 * DESCRIPTION: Free all objects within the requested cache and delete the 1256 * cache object. 1257 * 1258 ******************************************************************************/ 1259 1260 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1261 { 1262 kmem_cache_destroy(cache); 1263 return (AE_OK); 1264 } 1265 1266 /******************************************************************************* 1267 * 1268 * FUNCTION: acpi_os_release_object 1269 * 1270 * PARAMETERS: Cache - Handle to cache object 1271 * Object - The object to be released 1272 * 1273 * RETURN: None 1274 * 1275 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1276 * the object is deleted. 1277 * 1278 ******************************************************************************/ 1279 1280 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1281 { 1282 kmem_cache_free(cache, object); 1283 return (AE_OK); 1284 } 1285 1286 /****************************************************************************** 1287 * 1288 * FUNCTION: acpi_os_validate_interface 1289 * 1290 * PARAMETERS: interface - Requested interface to be validated 1291 * 1292 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise 1293 * 1294 * DESCRIPTION: Match an interface string to the interfaces supported by the 1295 * host. Strings originate from an AML call to the _OSI method. 1296 * 1297 *****************************************************************************/ 1298 1299 acpi_status 1300 acpi_os_validate_interface (char *interface) 1301 { 1302 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX)) 1303 return AE_OK; 1304 if (!strcmp("Linux", interface)) { 1305 1306 printk(KERN_NOTICE PREFIX 1307 "BIOS _OSI(Linux) query %s%s\n", 1308 osi_linux.enable ? "honored" : "ignored", 1309 osi_linux.cmdline ? " via cmdline" : 1310 osi_linux.dmi ? " via DMI" : ""); 1311 1312 if (osi_linux.enable) 1313 return AE_OK; 1314 } 1315 return AE_SUPPORT; 1316 } 1317 1318 static inline int acpi_res_list_add(struct acpi_res_list *res) 1319 { 1320 struct acpi_res_list *res_list_elem; 1321 1322 list_for_each_entry(res_list_elem, &resource_list_head, 1323 resource_list) { 1324 1325 if (res->resource_type == res_list_elem->resource_type && 1326 res->start == res_list_elem->start && 1327 res->end == res_list_elem->end) { 1328 1329 /* 1330 * The Region(addr,len) already exist in the list, 1331 * just increase the count 1332 */ 1333 1334 res_list_elem->count++; 1335 return 0; 1336 } 1337 } 1338 1339 res->count = 1; 1340 list_add(&res->resource_list, &resource_list_head); 1341 return 1; 1342 } 1343 1344 static inline void acpi_res_list_del(struct acpi_res_list *res) 1345 { 1346 struct acpi_res_list *res_list_elem; 1347 1348 list_for_each_entry(res_list_elem, &resource_list_head, 1349 resource_list) { 1350 1351 if (res->resource_type == res_list_elem->resource_type && 1352 res->start == res_list_elem->start && 1353 res->end == res_list_elem->end) { 1354 1355 /* 1356 * If the res count is decreased to 0, 1357 * remove and free it 1358 */ 1359 1360 if (--res_list_elem->count == 0) { 1361 list_del(&res_list_elem->resource_list); 1362 kfree(res_list_elem); 1363 } 1364 return; 1365 } 1366 } 1367 } 1368 1369 acpi_status 1370 acpi_os_invalidate_address( 1371 u8 space_id, 1372 acpi_physical_address address, 1373 acpi_size length) 1374 { 1375 struct acpi_res_list res; 1376 1377 switch (space_id) { 1378 case ACPI_ADR_SPACE_SYSTEM_IO: 1379 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1380 /* Only interference checks against SystemIO and SystemMemory 1381 are needed */ 1382 res.start = address; 1383 res.end = address + length - 1; 1384 res.resource_type = space_id; 1385 spin_lock(&acpi_res_lock); 1386 acpi_res_list_del(&res); 1387 spin_unlock(&acpi_res_lock); 1388 break; 1389 case ACPI_ADR_SPACE_PCI_CONFIG: 1390 case ACPI_ADR_SPACE_EC: 1391 case ACPI_ADR_SPACE_SMBUS: 1392 case ACPI_ADR_SPACE_CMOS: 1393 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1394 case ACPI_ADR_SPACE_DATA_TABLE: 1395 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1396 break; 1397 } 1398 return AE_OK; 1399 } 1400 1401 /****************************************************************************** 1402 * 1403 * FUNCTION: acpi_os_validate_address 1404 * 1405 * PARAMETERS: space_id - ACPI space ID 1406 * address - Physical address 1407 * length - Address length 1408 * 1409 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1410 * should return AE_AML_ILLEGAL_ADDRESS. 1411 * 1412 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1413 * the addresses accessed by AML operation regions. 1414 * 1415 *****************************************************************************/ 1416 1417 acpi_status 1418 acpi_os_validate_address ( 1419 u8 space_id, 1420 acpi_physical_address address, 1421 acpi_size length, 1422 char *name) 1423 { 1424 struct acpi_res_list *res; 1425 int added; 1426 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1427 return AE_OK; 1428 1429 switch (space_id) { 1430 case ACPI_ADR_SPACE_SYSTEM_IO: 1431 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1432 /* Only interference checks against SystemIO and SystemMemory 1433 are needed */ 1434 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL); 1435 if (!res) 1436 return AE_OK; 1437 /* ACPI names are fixed to 4 bytes, still better use strlcpy */ 1438 strlcpy(res->name, name, 5); 1439 res->start = address; 1440 res->end = address + length - 1; 1441 res->resource_type = space_id; 1442 spin_lock(&acpi_res_lock); 1443 added = acpi_res_list_add(res); 1444 spin_unlock(&acpi_res_lock); 1445 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, " 1446 "name: %s\n", added ? "Added" : "Already exist", 1447 (space_id == ACPI_ADR_SPACE_SYSTEM_IO) 1448 ? "SystemIO" : "System Memory", 1449 (unsigned long long)res->start, 1450 (unsigned long long)res->end, 1451 res->name); 1452 if (!added) 1453 kfree(res); 1454 break; 1455 case ACPI_ADR_SPACE_PCI_CONFIG: 1456 case ACPI_ADR_SPACE_EC: 1457 case ACPI_ADR_SPACE_SMBUS: 1458 case ACPI_ADR_SPACE_CMOS: 1459 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1460 case ACPI_ADR_SPACE_DATA_TABLE: 1461 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1462 break; 1463 } 1464 return AE_OK; 1465 } 1466 1467 #endif 1468