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 55ACPI_MODULE_NAME("osl"); 56#define PREFIX "ACPI: " 57struct 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 */ 72int acpi_in_debugger; 73EXPORT_SYMBOL(acpi_in_debugger); 74 75extern char line_buf[80]; 76#endif /*ENABLE_DEBUGGER */ 77 78static unsigned int acpi_irq_irq; 79static acpi_osd_handler acpi_irq_handler; 80static void *acpi_irq_context; 81static struct workqueue_struct *kacpid_wq; 82static struct workqueue_struct *kacpi_notify_wq; 83static struct workqueue_struct *kacpi_hotplug_wq; 84 85struct 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 95static LIST_HEAD(resource_list_head); 96static DEFINE_SPINLOCK(acpi_res_lock); 97 98#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 99static 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 134static 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 141static void __init acpi_request_region (struct acpi_generic_address *addr, 142 unsigned int length, char *desc) 143{ 144 if (!addr->address || !length) 145 return; 146 147 /* Resources are never freed */ 148 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 149 request_region(addr->address, length, desc); 150 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 151 request_mem_region(addr->address, length, desc); 152} 153 154static int __init acpi_reserve_resources(void) 155{ 156 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 157 "ACPI PM1a_EVT_BLK"); 158 159 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 160 "ACPI PM1b_EVT_BLK"); 161 162 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 163 "ACPI PM1a_CNT_BLK"); 164 165 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 166 "ACPI PM1b_CNT_BLK"); 167 168 if (acpi_gbl_FADT.pm_timer_length == 4) 169 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 170 171 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 172 "ACPI PM2_CNT_BLK"); 173 174 /* Length of GPE blocks must be a non-negative multiple of 2 */ 175 176 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 177 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 178 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 179 180 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 181 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 182 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 183 184 return 0; 185} 186device_initcall(acpi_reserve_resources); 187 188acpi_status __init acpi_os_initialize(void) 189{ 190 return AE_OK; 191} 192 193acpi_status acpi_os_initialize1(void) 194{ 195 kacpid_wq = create_workqueue("kacpid"); 196 kacpi_notify_wq = create_workqueue("kacpi_notify"); 197 kacpi_hotplug_wq = create_workqueue("kacpi_hotplug"); 198 BUG_ON(!kacpid_wq); 199 BUG_ON(!kacpi_notify_wq); 200 BUG_ON(!kacpi_hotplug_wq); 201 return AE_OK; 202} 203 204acpi_status acpi_os_terminate(void) 205{ 206 if (acpi_irq_handler) { 207 acpi_os_remove_interrupt_handler(acpi_irq_irq, 208 acpi_irq_handler); 209 } 210 211 destroy_workqueue(kacpid_wq); 212 destroy_workqueue(kacpi_notify_wq); 213 destroy_workqueue(kacpi_hotplug_wq); 214 215 return AE_OK; 216} 217 218void acpi_os_printf(const char *fmt, ...) 219{ 220 va_list args; 221 va_start(args, fmt); 222 acpi_os_vprintf(fmt, args); 223 va_end(args); 224} 225 226void acpi_os_vprintf(const char *fmt, va_list args) 227{ 228 static char buffer[512]; 229 230 vsprintf(buffer, fmt, args); 231 232#ifdef ENABLE_DEBUGGER 233 if (acpi_in_debugger) { 234 kdb_printf("%s", buffer); 235 } else { 236 printk(KERN_CONT "%s", buffer); 237 } 238#else 239 printk(KERN_CONT "%s", buffer); 240#endif 241} 242 243acpi_physical_address __init acpi_os_get_root_pointer(void) 244{ 245 if (efi_enabled) { 246 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 247 return efi.acpi20; 248 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 249 return efi.acpi; 250 else { 251 printk(KERN_ERR PREFIX 252 "System description tables not found\n"); 253 return 0; 254 } 255 } else { 256 acpi_physical_address pa = 0; 257 258 acpi_find_root_pointer(&pa); 259 return pa; 260 } 261} 262 263void __iomem *__init_refok 264acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 265{ 266 if (phys > ULONG_MAX) { 267 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 268 return NULL; 269 } 270 if (acpi_gbl_permanent_mmap) 271 /* 272 * ioremap checks to ensure this is in reserved space 273 */ 274 return ioremap((unsigned long)phys, size); 275 else 276 return __acpi_map_table((unsigned long)phys, size); 277} 278EXPORT_SYMBOL_GPL(acpi_os_map_memory); 279 280void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 281{ 282 if (acpi_gbl_permanent_mmap) 283 iounmap(virt); 284 else 285 __acpi_unmap_table(virt, size); 286} 287EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 288 289void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 290{ 291 if (!acpi_gbl_permanent_mmap) 292 __acpi_unmap_table(virt, size); 293} 294 295#ifdef ACPI_FUTURE_USAGE 296acpi_status 297acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 298{ 299 if (!phys || !virt) 300 return AE_BAD_PARAMETER; 301 302 *phys = virt_to_phys(virt); 303 304 return AE_OK; 305} 306#endif 307 308#define ACPI_MAX_OVERRIDE_LEN 100 309 310static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 311 312acpi_status 313acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 314 acpi_string * new_val) 315{ 316 if (!init_val || !new_val) 317 return AE_BAD_PARAMETER; 318 319 *new_val = NULL; 320 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 321 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 322 acpi_os_name); 323 *new_val = acpi_os_name; 324 } 325 326 return AE_OK; 327} 328 329acpi_status 330acpi_os_table_override(struct acpi_table_header * existing_table, 331 struct acpi_table_header ** new_table) 332{ 333 if (!existing_table || !new_table) 334 return AE_BAD_PARAMETER; 335 336 *new_table = NULL; 337 338#ifdef CONFIG_ACPI_CUSTOM_DSDT 339 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 340 *new_table = (struct acpi_table_header *)AmlCode; 341#endif 342 if (*new_table != NULL) { 343 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 344 "this is unsafe: tainting kernel\n", 345 existing_table->signature, 346 existing_table->oem_table_id); 347 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 348 } 349 return AE_OK; 350} 351 352static irqreturn_t acpi_irq(int irq, void *dev_id) 353{ 354 u32 handled; 355 356 handled = (*acpi_irq_handler) (acpi_irq_context); 357 358 if (handled) { 359 acpi_irq_handled++; 360 return IRQ_HANDLED; 361 } else { 362 acpi_irq_not_handled++; 363 return IRQ_NONE; 364 } 365} 366 367acpi_status 368acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 369 void *context) 370{ 371 unsigned int irq; 372 373 acpi_irq_stats_init(); 374 375 /* 376 * Ignore the GSI from the core, and use the value in our copy of the 377 * FADT. It may not be the same if an interrupt source override exists 378 * for the SCI. 379 */ 380 gsi = acpi_gbl_FADT.sci_interrupt; 381 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 382 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 383 gsi); 384 return AE_OK; 385 } 386 387 acpi_irq_handler = handler; 388 acpi_irq_context = context; 389 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 390 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 391 return AE_NOT_ACQUIRED; 392 } 393 acpi_irq_irq = irq; 394 395 return AE_OK; 396} 397 398acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 399{ 400 if (irq) { 401 free_irq(irq, acpi_irq); 402 acpi_irq_handler = NULL; 403 acpi_irq_irq = 0; 404 } 405 406 return AE_OK; 407} 408 409/* 410 * Running in interpreter thread context, safe to sleep 411 */ 412 413void acpi_os_sleep(u64 ms) 414{ 415 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 416} 417 418void acpi_os_stall(u32 us) 419{ 420 while (us) { 421 u32 delay = 1000; 422 423 if (delay > us) 424 delay = us; 425 udelay(delay); 426 touch_nmi_watchdog(); 427 us -= delay; 428 } 429} 430 431/* 432 * Support ACPI 3.0 AML Timer operand 433 * Returns 64-bit free-running, monotonically increasing timer 434 * with 100ns granularity 435 */ 436u64 acpi_os_get_timer(void) 437{ 438 static u64 t; 439 440#ifdef CONFIG_HPET 441 /* TBD: use HPET if available */ 442#endif 443 444#ifdef CONFIG_X86_PM_TIMER 445 /* TBD: default to PM timer if HPET was not available */ 446#endif 447 if (!t) 448 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 449 450 return ++t; 451} 452 453acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 454{ 455 u32 dummy; 456 457 if (!value) 458 value = &dummy; 459 460 *value = 0; 461 if (width <= 8) { 462 *(u8 *) value = inb(port); 463 } else if (width <= 16) { 464 *(u16 *) value = inw(port); 465 } else if (width <= 32) { 466 *(u32 *) value = inl(port); 467 } else { 468 BUG(); 469 } 470 471 return AE_OK; 472} 473 474EXPORT_SYMBOL(acpi_os_read_port); 475 476acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 477{ 478 if (width <= 8) { 479 outb(value, port); 480 } else if (width <= 16) { 481 outw(value, port); 482 } else if (width <= 32) { 483 outl(value, port); 484 } else { 485 BUG(); 486 } 487 488 return AE_OK; 489} 490 491EXPORT_SYMBOL(acpi_os_write_port); 492 493acpi_status 494acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 495{ 496 u32 dummy; 497 void __iomem *virt_addr; 498 499 virt_addr = ioremap(phys_addr, width); 500 if (!value) 501 value = &dummy; 502 503 switch (width) { 504 case 8: 505 *(u8 *) value = readb(virt_addr); 506 break; 507 case 16: 508 *(u16 *) value = readw(virt_addr); 509 break; 510 case 32: 511 *(u32 *) value = readl(virt_addr); 512 break; 513 default: 514 BUG(); 515 } 516 517 iounmap(virt_addr); 518 519 return AE_OK; 520} 521 522acpi_status 523acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 524{ 525 void __iomem *virt_addr; 526 527 virt_addr = ioremap(phys_addr, width); 528 529 switch (width) { 530 case 8: 531 writeb(value, virt_addr); 532 break; 533 case 16: 534 writew(value, virt_addr); 535 break; 536 case 32: 537 writel(value, virt_addr); 538 break; 539 default: 540 BUG(); 541 } 542 543 iounmap(virt_addr); 544 545 return AE_OK; 546} 547 548acpi_status 549acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 550 u32 *value, u32 width) 551{ 552 int result, size; 553 554 if (!value) 555 return AE_BAD_PARAMETER; 556 557 switch (width) { 558 case 8: 559 size = 1; 560 break; 561 case 16: 562 size = 2; 563 break; 564 case 32: 565 size = 4; 566 break; 567 default: 568 return AE_ERROR; 569 } 570 571 result = raw_pci_read(pci_id->segment, pci_id->bus, 572 PCI_DEVFN(pci_id->device, pci_id->function), 573 reg, size, value); 574 575 return (result ? AE_ERROR : AE_OK); 576} 577 578acpi_status 579acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 580 u64 value, u32 width) 581{ 582 int result, size; 583 584 switch (width) { 585 case 8: 586 size = 1; 587 break; 588 case 16: 589 size = 2; 590 break; 591 case 32: 592 size = 4; 593 break; 594 default: 595 return AE_ERROR; 596 } 597 598 result = raw_pci_write(pci_id->segment, pci_id->bus, 599 PCI_DEVFN(pci_id->device, pci_id->function), 600 reg, size, value); 601 602 return (result ? AE_ERROR : AE_OK); 603} 604 605/* TODO: Change code to take advantage of driver model more */ 606static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */ 607 acpi_handle chandle, /* current node */ 608 struct acpi_pci_id **id, 609 int *is_bridge, u8 * bus_number) 610{ 611 acpi_handle handle; 612 struct acpi_pci_id *pci_id = *id; 613 acpi_status status; 614 unsigned long long temp; 615 acpi_object_type type; 616 617 acpi_get_parent(chandle, &handle); 618 if (handle != rhandle) { 619 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, 620 bus_number); 621 622 status = acpi_get_type(handle, &type); 623 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE)) 624 return; 625 626 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, 627 &temp); 628 if (ACPI_SUCCESS(status)) { 629 u32 val; 630 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp)); 631 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp)); 632 633 if (*is_bridge) 634 pci_id->bus = *bus_number; 635 636 /* any nicer way to get bus number of bridge ? */ 637 status = 638 acpi_os_read_pci_configuration(pci_id, 0x0e, &val, 639 8); 640 if (ACPI_SUCCESS(status) 641 && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) { 642 status = 643 acpi_os_read_pci_configuration(pci_id, 0x18, 644 &val, 8); 645 if (!ACPI_SUCCESS(status)) { 646 /* Certainly broken... FIX ME */ 647 return; 648 } 649 *is_bridge = 1; 650 pci_id->bus = val; 651 status = 652 acpi_os_read_pci_configuration(pci_id, 0x19, 653 &val, 8); 654 if (ACPI_SUCCESS(status)) { 655 *bus_number = val; 656 } 657 } else 658 *is_bridge = 0; 659 } 660 } 661} 662 663void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */ 664 acpi_handle chandle, /* current node */ 665 struct acpi_pci_id **id) 666{ 667 int is_bridge = 1; 668 u8 bus_number = (*id)->bus; 669 670 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number); 671} 672 673static void acpi_os_execute_deferred(struct work_struct *work) 674{ 675 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 676 677 if (dpc->wait) 678 acpi_os_wait_events_complete(NULL); 679 680 dpc->function(dpc->context); 681 kfree(dpc); 682} 683 684/******************************************************************************* 685 * 686 * FUNCTION: acpi_os_execute 687 * 688 * PARAMETERS: Type - Type of the callback 689 * Function - Function to be executed 690 * Context - Function parameters 691 * 692 * RETURN: Status 693 * 694 * DESCRIPTION: Depending on type, either queues function for deferred execution or 695 * immediately executes function on a separate thread. 696 * 697 ******************************************************************************/ 698 699static acpi_status __acpi_os_execute(acpi_execute_type type, 700 acpi_osd_exec_callback function, void *context, int hp) 701{ 702 acpi_status status = AE_OK; 703 struct acpi_os_dpc *dpc; 704 struct workqueue_struct *queue; 705 int ret; 706 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 707 "Scheduling function [%p(%p)] for deferred execution.\n", 708 function, context)); 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 AE_NO_MEMORY; 722 723 dpc->function = function; 724 dpc->context = context; 725 726 /* 727 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq 728 * because the hotplug code may call driver .remove() functions, 729 * which invoke flush_scheduled_work/acpi_os_wait_events_complete 730 * to flush these workqueues. 731 */ 732 queue = hp ? kacpi_hotplug_wq : 733 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); 734 dpc->wait = hp ? 1 : 0; 735 736 if (queue == kacpi_hotplug_wq) 737 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 738 else if (queue == kacpi_notify_wq) 739 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 740 else 741 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 742 743 /* 744 * On some machines, a software-initiated SMI causes corruption unless 745 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 746 * typically it's done in GPE-related methods that are run via 747 * workqueues, so we can avoid the known corruption cases by always 748 * queueing on CPU 0. 749 */ 750 ret = queue_work_on(0, queue, &dpc->work); 751 752 if (!ret) { 753 printk(KERN_ERR PREFIX 754 "Call to queue_work() failed.\n"); 755 status = AE_ERROR; 756 kfree(dpc); 757 } 758 return status; 759} 760 761acpi_status acpi_os_execute(acpi_execute_type type, 762 acpi_osd_exec_callback function, void *context) 763{ 764 return __acpi_os_execute(type, function, context, 0); 765} 766EXPORT_SYMBOL(acpi_os_execute); 767 768acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function, 769 void *context) 770{ 771 return __acpi_os_execute(0, function, context, 1); 772} 773 774void acpi_os_wait_events_complete(void *context) 775{ 776 flush_workqueue(kacpid_wq); 777 flush_workqueue(kacpi_notify_wq); 778} 779 780EXPORT_SYMBOL(acpi_os_wait_events_complete); 781 782/* 783 * Allocate the memory for a spinlock and initialize it. 784 */ 785acpi_status acpi_os_create_lock(acpi_spinlock * handle) 786{ 787 spin_lock_init(*handle); 788 789 return AE_OK; 790} 791 792/* 793 * Deallocate the memory for a spinlock. 794 */ 795void acpi_os_delete_lock(acpi_spinlock handle) 796{ 797 return; 798} 799 800acpi_status 801acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 802{ 803 struct semaphore *sem = NULL; 804 805 sem = acpi_os_allocate(sizeof(struct semaphore)); 806 if (!sem) 807 return AE_NO_MEMORY; 808 memset(sem, 0, sizeof(struct semaphore)); 809 810 sema_init(sem, initial_units); 811 812 *handle = (acpi_handle *) sem; 813 814 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 815 *handle, initial_units)); 816 817 return AE_OK; 818} 819 820/* 821 * TODO: A better way to delete semaphores? Linux doesn't have a 822 * 'delete_semaphore()' function -- may result in an invalid 823 * pointer dereference for non-synchronized consumers. Should 824 * we at least check for blocked threads and signal/cancel them? 825 */ 826 827acpi_status acpi_os_delete_semaphore(acpi_handle handle) 828{ 829 struct semaphore *sem = (struct semaphore *)handle; 830 831 if (!sem) 832 return AE_BAD_PARAMETER; 833 834 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 835 836 BUG_ON(!list_empty(&sem->wait_list)); 837 kfree(sem); 838 sem = NULL; 839 840 return AE_OK; 841} 842 843/* 844 * TODO: Support for units > 1? 845 */ 846acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 847{ 848 acpi_status status = AE_OK; 849 struct semaphore *sem = (struct semaphore *)handle; 850 long jiffies; 851 int ret = 0; 852 853 if (!sem || (units < 1)) 854 return AE_BAD_PARAMETER; 855 856 if (units > 1) 857 return AE_SUPPORT; 858 859 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 860 handle, units, timeout)); 861 862 if (timeout == ACPI_WAIT_FOREVER) 863 jiffies = MAX_SCHEDULE_TIMEOUT; 864 else 865 jiffies = msecs_to_jiffies(timeout); 866 867 ret = down_timeout(sem, jiffies); 868 if (ret) 869 status = AE_TIME; 870 871 if (ACPI_FAILURE(status)) { 872 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 873 "Failed to acquire semaphore[%p|%d|%d], %s", 874 handle, units, timeout, 875 acpi_format_exception(status))); 876 } else { 877 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 878 "Acquired semaphore[%p|%d|%d]", handle, 879 units, timeout)); 880 } 881 882 return status; 883} 884 885/* 886 * TODO: Support for units > 1? 887 */ 888acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 889{ 890 struct semaphore *sem = (struct semaphore *)handle; 891 892 if (!sem || (units < 1)) 893 return AE_BAD_PARAMETER; 894 895 if (units > 1) 896 return AE_SUPPORT; 897 898 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 899 units)); 900 901 up(sem); 902 903 return AE_OK; 904} 905 906#ifdef ACPI_FUTURE_USAGE 907u32 acpi_os_get_line(char *buffer) 908{ 909 910#ifdef ENABLE_DEBUGGER 911 if (acpi_in_debugger) { 912 u32 chars; 913 914 kdb_read(buffer, sizeof(line_buf)); 915 916 /* remove the CR kdb includes */ 917 chars = strlen(buffer) - 1; 918 buffer[chars] = '\0'; 919 } 920#endif 921 922 return 0; 923} 924#endif /* ACPI_FUTURE_USAGE */ 925 926acpi_status acpi_os_signal(u32 function, void *info) 927{ 928 switch (function) { 929 case ACPI_SIGNAL_FATAL: 930 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 931 break; 932 case ACPI_SIGNAL_BREAKPOINT: 933 /* 934 * AML Breakpoint 935 * ACPI spec. says to treat it as a NOP unless 936 * you are debugging. So if/when we integrate 937 * AML debugger into the kernel debugger its 938 * hook will go here. But until then it is 939 * not useful to print anything on breakpoints. 940 */ 941 break; 942 default: 943 break; 944 } 945 946 return AE_OK; 947} 948 949static int __init acpi_os_name_setup(char *str) 950{ 951 char *p = acpi_os_name; 952 int count = ACPI_MAX_OVERRIDE_LEN - 1; 953 954 if (!str || !*str) 955 return 0; 956 957 for (; count-- && str && *str; str++) { 958 if (isalnum(*str) || *str == ' ' || *str == ':') 959 *p++ = *str; 960 else if (*str == '\'' || *str == '"') 961 continue; 962 else 963 break; 964 } 965 *p = 0; 966 967 return 1; 968 969} 970 971__setup("acpi_os_name=", acpi_os_name_setup); 972 973static void __init set_osi_linux(unsigned int enable) 974{ 975 if (osi_linux.enable != enable) { 976 osi_linux.enable = enable; 977 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n", 978 enable ? "Add": "Delet"); 979 } 980 return; 981} 982 983static void __init acpi_cmdline_osi_linux(unsigned int enable) 984{ 985 osi_linux.cmdline = 1; /* cmdline set the default */ 986 set_osi_linux(enable); 987 988 return; 989} 990 991void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 992{ 993 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 994 995 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 996 997 if (enable == -1) 998 return; 999 1000 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */ 1001 1002 set_osi_linux(enable); 1003 1004 return; 1005} 1006 1007/* 1008 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1009 * 1010 * empty string disables _OSI 1011 * string starting with '!' disables that string 1012 * otherwise string is added to list, augmenting built-in strings 1013 */ 1014int __init acpi_osi_setup(char *str) 1015{ 1016 if (str == NULL || *str == '\0') { 1017 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1018 acpi_gbl_create_osi_method = FALSE; 1019 } else if (!strcmp("!Linux", str)) { 1020 acpi_cmdline_osi_linux(0); /* !enable */ 1021 } else if (*str == '!') { 1022 if (acpi_osi_invalidate(++str) == AE_OK) 1023 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1024 } else if (!strcmp("Linux", str)) { 1025 acpi_cmdline_osi_linux(1); /* enable */ 1026 } else if (*osi_additional_string == '\0') { 1027 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX); 1028 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1029 } 1030 1031 return 1; 1032} 1033 1034__setup("acpi_osi=", acpi_osi_setup); 1035 1036/* enable serialization to combat AE_ALREADY_EXISTS errors */ 1037static int __init acpi_serialize_setup(char *str) 1038{ 1039 printk(KERN_INFO PREFIX "serialize enabled\n"); 1040 1041 acpi_gbl_all_methods_serialized = TRUE; 1042 1043 return 1; 1044} 1045 1046__setup("acpi_serialize", acpi_serialize_setup); 1047 1048/* Check of resource interference between native drivers and ACPI 1049 * OperationRegions (SystemIO and System Memory only). 1050 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1051 * in arbitrary AML code and can interfere with legacy drivers. 1052 * acpi_enforce_resources= can be set to: 1053 * 1054 * - strict (default) (2) 1055 * -> further driver trying to access the resources will not load 1056 * - lax (1) 1057 * -> further driver trying to access the resources will load, but you 1058 * get a system message that something might go wrong... 1059 * 1060 * - no (0) 1061 * -> ACPI Operation Region resources will not be registered 1062 * 1063 */ 1064#define ENFORCE_RESOURCES_STRICT 2 1065#define ENFORCE_RESOURCES_LAX 1 1066#define ENFORCE_RESOURCES_NO 0 1067 1068static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1069 1070static int __init acpi_enforce_resources_setup(char *str) 1071{ 1072 if (str == NULL || *str == '\0') 1073 return 0; 1074 1075 if (!strcmp("strict", str)) 1076 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1077 else if (!strcmp("lax", str)) 1078 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1079 else if (!strcmp("no", str)) 1080 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1081 1082 return 1; 1083} 1084 1085__setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1086 1087/* Check for resource conflicts between ACPI OperationRegions and native 1088 * drivers */ 1089int acpi_check_resource_conflict(const struct resource *res) 1090{ 1091 struct acpi_res_list *res_list_elem; 1092 int ioport; 1093 int clash = 0; 1094 1095 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1096 return 0; 1097 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1098 return 0; 1099 1100 ioport = res->flags & IORESOURCE_IO; 1101 1102 spin_lock(&acpi_res_lock); 1103 list_for_each_entry(res_list_elem, &resource_list_head, 1104 resource_list) { 1105 if (ioport && (res_list_elem->resource_type 1106 != ACPI_ADR_SPACE_SYSTEM_IO)) 1107 continue; 1108 if (!ioport && (res_list_elem->resource_type 1109 != ACPI_ADR_SPACE_SYSTEM_MEMORY)) 1110 continue; 1111 1112 if (res->end < res_list_elem->start 1113 || res_list_elem->end < res->start) 1114 continue; 1115 clash = 1; 1116 break; 1117 } 1118 spin_unlock(&acpi_res_lock); 1119 1120 if (clash) { 1121 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1122 printk(KERN_WARNING "ACPI: resource %s %pR" 1123 " conflicts with ACPI region %s %pR\n", 1124 res->name, res, res_list_elem->name, 1125 res_list_elem); 1126 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1127 printk(KERN_NOTICE "ACPI: This conflict may" 1128 " cause random problems and system" 1129 " instability\n"); 1130 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1131 " for this device, you should use it instead of" 1132 " the native driver\n"); 1133 } 1134 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1135 return -EBUSY; 1136 } 1137 return 0; 1138} 1139EXPORT_SYMBOL(acpi_check_resource_conflict); 1140 1141int acpi_check_region(resource_size_t start, resource_size_t n, 1142 const char *name) 1143{ 1144 struct resource res = { 1145 .start = start, 1146 .end = start + n - 1, 1147 .name = name, 1148 .flags = IORESOURCE_IO, 1149 }; 1150 1151 return acpi_check_resource_conflict(&res); 1152} 1153EXPORT_SYMBOL(acpi_check_region); 1154 1155int acpi_check_mem_region(resource_size_t start, resource_size_t n, 1156 const char *name) 1157{ 1158 struct resource res = { 1159 .start = start, 1160 .end = start + n - 1, 1161 .name = name, 1162 .flags = IORESOURCE_MEM, 1163 }; 1164 1165 return acpi_check_resource_conflict(&res); 1166 1167} 1168EXPORT_SYMBOL(acpi_check_mem_region); 1169 1170/* 1171 * Let drivers know whether the resource checks are effective 1172 */ 1173int acpi_resources_are_enforced(void) 1174{ 1175 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1176} 1177EXPORT_SYMBOL(acpi_resources_are_enforced); 1178 1179/* 1180 * Acquire a spinlock. 1181 * 1182 * handle is a pointer to the spinlock_t. 1183 */ 1184 1185acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1186{ 1187 acpi_cpu_flags flags; 1188 spin_lock_irqsave(lockp, flags); 1189 return flags; 1190} 1191 1192/* 1193 * Release a spinlock. See above. 1194 */ 1195 1196void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1197{ 1198 spin_unlock_irqrestore(lockp, flags); 1199} 1200 1201#ifndef ACPI_USE_LOCAL_CACHE 1202 1203/******************************************************************************* 1204 * 1205 * FUNCTION: acpi_os_create_cache 1206 * 1207 * PARAMETERS: name - Ascii name for the cache 1208 * size - Size of each cached object 1209 * depth - Maximum depth of the cache (in objects) <ignored> 1210 * cache - Where the new cache object is returned 1211 * 1212 * RETURN: status 1213 * 1214 * DESCRIPTION: Create a cache object 1215 * 1216 ******************************************************************************/ 1217 1218acpi_status 1219acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1220{ 1221 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1222 if (*cache == NULL) 1223 return AE_ERROR; 1224 else 1225 return AE_OK; 1226} 1227 1228/******************************************************************************* 1229 * 1230 * FUNCTION: acpi_os_purge_cache 1231 * 1232 * PARAMETERS: Cache - Handle to cache object 1233 * 1234 * RETURN: Status 1235 * 1236 * DESCRIPTION: Free all objects within the requested cache. 1237 * 1238 ******************************************************************************/ 1239 1240acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1241{ 1242 kmem_cache_shrink(cache); 1243 return (AE_OK); 1244} 1245 1246/******************************************************************************* 1247 * 1248 * FUNCTION: acpi_os_delete_cache 1249 * 1250 * PARAMETERS: Cache - Handle to cache object 1251 * 1252 * RETURN: Status 1253 * 1254 * DESCRIPTION: Free all objects within the requested cache and delete the 1255 * cache object. 1256 * 1257 ******************************************************************************/ 1258 1259acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1260{ 1261 kmem_cache_destroy(cache); 1262 return (AE_OK); 1263} 1264 1265/******************************************************************************* 1266 * 1267 * FUNCTION: acpi_os_release_object 1268 * 1269 * PARAMETERS: Cache - Handle to cache object 1270 * Object - The object to be released 1271 * 1272 * RETURN: None 1273 * 1274 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1275 * the object is deleted. 1276 * 1277 ******************************************************************************/ 1278 1279acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1280{ 1281 kmem_cache_free(cache, object); 1282 return (AE_OK); 1283} 1284 1285/****************************************************************************** 1286 * 1287 * FUNCTION: acpi_os_validate_interface 1288 * 1289 * PARAMETERS: interface - Requested interface to be validated 1290 * 1291 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise 1292 * 1293 * DESCRIPTION: Match an interface string to the interfaces supported by the 1294 * host. Strings originate from an AML call to the _OSI method. 1295 * 1296 *****************************************************************************/ 1297 1298acpi_status 1299acpi_os_validate_interface (char *interface) 1300{ 1301 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX)) 1302 return AE_OK; 1303 if (!strcmp("Linux", interface)) { 1304 1305 printk(KERN_NOTICE PREFIX 1306 "BIOS _OSI(Linux) query %s%s\n", 1307 osi_linux.enable ? "honored" : "ignored", 1308 osi_linux.cmdline ? " via cmdline" : 1309 osi_linux.dmi ? " via DMI" : ""); 1310 1311 if (osi_linux.enable) 1312 return AE_OK; 1313 } 1314 return AE_SUPPORT; 1315} 1316 1317static inline int acpi_res_list_add(struct acpi_res_list *res) 1318{ 1319 struct acpi_res_list *res_list_elem; 1320 1321 list_for_each_entry(res_list_elem, &resource_list_head, 1322 resource_list) { 1323 1324 if (res->resource_type == res_list_elem->resource_type && 1325 res->start == res_list_elem->start && 1326 res->end == res_list_elem->end) { 1327 1328 /* 1329 * The Region(addr,len) already exist in the list, 1330 * just increase the count 1331 */ 1332 1333 res_list_elem->count++; 1334 return 0; 1335 } 1336 } 1337 1338 res->count = 1; 1339 list_add(&res->resource_list, &resource_list_head); 1340 return 1; 1341} 1342 1343static inline void acpi_res_list_del(struct acpi_res_list *res) 1344{ 1345 struct acpi_res_list *res_list_elem; 1346 1347 list_for_each_entry(res_list_elem, &resource_list_head, 1348 resource_list) { 1349 1350 if (res->resource_type == res_list_elem->resource_type && 1351 res->start == res_list_elem->start && 1352 res->end == res_list_elem->end) { 1353 1354 /* 1355 * If the res count is decreased to 0, 1356 * remove and free it 1357 */ 1358 1359 if (--res_list_elem->count == 0) { 1360 list_del(&res_list_elem->resource_list); 1361 kfree(res_list_elem); 1362 } 1363 return; 1364 } 1365 } 1366} 1367 1368acpi_status 1369acpi_os_invalidate_address( 1370 u8 space_id, 1371 acpi_physical_address address, 1372 acpi_size length) 1373{ 1374 struct acpi_res_list res; 1375 1376 switch (space_id) { 1377 case ACPI_ADR_SPACE_SYSTEM_IO: 1378 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1379 /* Only interference checks against SystemIO and SystemMemory 1380 are needed */ 1381 res.start = address; 1382 res.end = address + length - 1; 1383 res.resource_type = space_id; 1384 spin_lock(&acpi_res_lock); 1385 acpi_res_list_del(&res); 1386 spin_unlock(&acpi_res_lock); 1387 break; 1388 case ACPI_ADR_SPACE_PCI_CONFIG: 1389 case ACPI_ADR_SPACE_EC: 1390 case ACPI_ADR_SPACE_SMBUS: 1391 case ACPI_ADR_SPACE_CMOS: 1392 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1393 case ACPI_ADR_SPACE_DATA_TABLE: 1394 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1395 break; 1396 } 1397 return AE_OK; 1398} 1399 1400/****************************************************************************** 1401 * 1402 * FUNCTION: acpi_os_validate_address 1403 * 1404 * PARAMETERS: space_id - ACPI space ID 1405 * address - Physical address 1406 * length - Address length 1407 * 1408 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1409 * should return AE_AML_ILLEGAL_ADDRESS. 1410 * 1411 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1412 * the addresses accessed by AML operation regions. 1413 * 1414 *****************************************************************************/ 1415 1416acpi_status 1417acpi_os_validate_address ( 1418 u8 space_id, 1419 acpi_physical_address address, 1420 acpi_size length, 1421 char *name) 1422{ 1423 struct acpi_res_list *res; 1424 int added; 1425 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1426 return AE_OK; 1427 1428 switch (space_id) { 1429 case ACPI_ADR_SPACE_SYSTEM_IO: 1430 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1431 /* Only interference checks against SystemIO and SystemMemory 1432 are needed */ 1433 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL); 1434 if (!res) 1435 return AE_OK; 1436 /* ACPI names are fixed to 4 bytes, still better use strlcpy */ 1437 strlcpy(res->name, name, 5); 1438 res->start = address; 1439 res->end = address + length - 1; 1440 res->resource_type = space_id; 1441 spin_lock(&acpi_res_lock); 1442 added = acpi_res_list_add(res); 1443 spin_unlock(&acpi_res_lock); 1444 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, " 1445 "name: %s\n", added ? "Added" : "Already exist", 1446 (space_id == ACPI_ADR_SPACE_SYSTEM_IO) 1447 ? "SystemIO" : "System Memory", 1448 (unsigned long long)res->start, 1449 (unsigned long long)res->end, 1450 res->name); 1451 if (!added) 1452 kfree(res); 1453 break; 1454 case ACPI_ADR_SPACE_PCI_CONFIG: 1455 case ACPI_ADR_SPACE_EC: 1456 case ACPI_ADR_SPACE_SMBUS: 1457 case ACPI_ADR_SPACE_CMOS: 1458 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1459 case ACPI_ADR_SPACE_DATA_TABLE: 1460 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1461 break; 1462 } 1463 return AE_OK; 1464} 1465 1466#endif 1467