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/dmi.h> 39 #include <linux/workqueue.h> 40 #include <linux/nmi.h> 41 #include <linux/acpi.h> 42 #include <linux/efi.h> 43 #include <linux/ioport.h> 44 #include <linux/list.h> 45 #include <linux/jiffies.h> 46 #include <linux/semaphore.h> 47 48 #include <asm/io.h> 49 #include <asm/uaccess.h> 50 51 #include <acpi/acpi.h> 52 #include <acpi/acpi_bus.h> 53 #include <acpi/processor.h> 54 55 #define _COMPONENT ACPI_OS_SERVICES 56 ACPI_MODULE_NAME("osl"); 57 #define PREFIX "ACPI: " 58 struct acpi_os_dpc { 59 acpi_osd_exec_callback function; 60 void *context; 61 struct work_struct work; 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 84 struct acpi_res_list { 85 resource_size_t start; 86 resource_size_t end; 87 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/ 88 char name[5]; /* only can have a length of 4 chars, make use of this 89 one instead of res->name, no need to kalloc then */ 90 struct list_head resource_list; 91 }; 92 93 static LIST_HEAD(resource_list_head); 94 static DEFINE_SPINLOCK(acpi_res_lock); 95 96 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 97 static char osi_additional_string[OSI_STRING_LENGTH_MAX]; 98 99 /* 100 * "Ode to _OSI(Linux)" 101 * 102 * osi_linux -- Control response to BIOS _OSI(Linux) query. 103 * 104 * As Linux evolves, the features that it supports change. 105 * So an OSI string such as "Linux" is not specific enough 106 * to be useful across multiple versions of Linux. It 107 * doesn't identify any particular feature, interface, 108 * or even any particular version of Linux... 109 * 110 * Unfortunately, Linux-2.6.22 and earlier responded "yes" 111 * to a BIOS _OSI(Linux) query. When 112 * a reference mobile BIOS started using it, its use 113 * started to spread to many vendor platforms. 114 * As it is not supportable, we need to halt that spread. 115 * 116 * Today, most BIOS references to _OSI(Linux) are noise -- 117 * they have no functional effect and are just dead code 118 * carried over from the reference BIOS. 119 * 120 * The next most common case is that _OSI(Linux) harms Linux, 121 * usually by causing the BIOS to follow paths that are 122 * not tested during Windows validation. 123 * 124 * Finally, there is a short list of platforms 125 * where OSI(Linux) benefits Linux. 126 * 127 * In Linux-2.6.23, OSI(Linux) is first disabled by default. 128 * DMI is used to disable the dmesg warning about OSI(Linux) 129 * on platforms where it is known to have no effect. 130 * But a dmesg warning remains for systems where 131 * we do not know if OSI(Linux) is good or bad for the system. 132 * DMI is also used to enable OSI(Linux) for the machines 133 * that are known to need it. 134 * 135 * BIOS writers should NOT query _OSI(Linux) on future systems. 136 * It will be ignored by default, and to get Linux to 137 * not ignore it will require a kernel source update to 138 * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation. 139 */ 140 #define OSI_LINUX_ENABLE 0 141 142 static struct osi_linux { 143 unsigned int enable:1; 144 unsigned int dmi:1; 145 unsigned int cmdline:1; 146 unsigned int known:1; 147 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0}; 148 149 static void __init acpi_request_region (struct acpi_generic_address *addr, 150 unsigned int length, char *desc) 151 { 152 struct resource *res; 153 154 if (!addr->address || !length) 155 return; 156 157 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 158 res = request_region(addr->address, length, desc); 159 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 160 res = request_mem_region(addr->address, length, desc); 161 } 162 163 static int __init acpi_reserve_resources(void) 164 { 165 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 166 "ACPI PM1a_EVT_BLK"); 167 168 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 169 "ACPI PM1b_EVT_BLK"); 170 171 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 172 "ACPI PM1a_CNT_BLK"); 173 174 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 175 "ACPI PM1b_CNT_BLK"); 176 177 if (acpi_gbl_FADT.pm_timer_length == 4) 178 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 179 180 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 181 "ACPI PM2_CNT_BLK"); 182 183 /* Length of GPE blocks must be a non-negative multiple of 2 */ 184 185 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 186 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 187 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 188 189 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 190 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 191 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 192 193 return 0; 194 } 195 device_initcall(acpi_reserve_resources); 196 197 acpi_status __init acpi_os_initialize(void) 198 { 199 return AE_OK; 200 } 201 202 acpi_status acpi_os_initialize1(void) 203 { 204 kacpid_wq = create_singlethread_workqueue("kacpid"); 205 kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify"); 206 BUG_ON(!kacpid_wq); 207 BUG_ON(!kacpi_notify_wq); 208 return AE_OK; 209 } 210 211 acpi_status acpi_os_terminate(void) 212 { 213 if (acpi_irq_handler) { 214 acpi_os_remove_interrupt_handler(acpi_irq_irq, 215 acpi_irq_handler); 216 } 217 218 destroy_workqueue(kacpid_wq); 219 destroy_workqueue(kacpi_notify_wq); 220 221 return AE_OK; 222 } 223 224 void acpi_os_printf(const char *fmt, ...) 225 { 226 va_list args; 227 va_start(args, fmt); 228 acpi_os_vprintf(fmt, args); 229 va_end(args); 230 } 231 232 void acpi_os_vprintf(const char *fmt, va_list args) 233 { 234 static char buffer[512]; 235 236 vsprintf(buffer, fmt, args); 237 238 #ifdef ENABLE_DEBUGGER 239 if (acpi_in_debugger) { 240 kdb_printf("%s", buffer); 241 } else { 242 printk("%s", buffer); 243 } 244 #else 245 printk("%s", buffer); 246 #endif 247 } 248 249 acpi_physical_address __init acpi_os_get_root_pointer(void) 250 { 251 if (efi_enabled) { 252 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 253 return efi.acpi20; 254 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 255 return efi.acpi; 256 else { 257 printk(KERN_ERR PREFIX 258 "System description tables not found\n"); 259 return 0; 260 } 261 } else { 262 acpi_physical_address pa = 0; 263 264 acpi_find_root_pointer(&pa); 265 return pa; 266 } 267 } 268 269 void __iomem *__init_refok 270 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 271 { 272 if (phys > ULONG_MAX) { 273 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 274 return NULL; 275 } 276 if (acpi_gbl_permanent_mmap) 277 /* 278 * ioremap checks to ensure this is in reserved space 279 */ 280 return ioremap((unsigned long)phys, size); 281 else 282 return __acpi_map_table((unsigned long)phys, size); 283 } 284 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 285 286 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size) 287 { 288 if (acpi_gbl_permanent_mmap) { 289 iounmap(virt); 290 } 291 } 292 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 293 294 #ifdef ACPI_FUTURE_USAGE 295 acpi_status 296 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 297 { 298 if (!phys || !virt) 299 return AE_BAD_PARAMETER; 300 301 *phys = virt_to_phys(virt); 302 303 return AE_OK; 304 } 305 #endif 306 307 #define ACPI_MAX_OVERRIDE_LEN 100 308 309 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 310 311 acpi_status 312 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 313 acpi_string * new_val) 314 { 315 if (!init_val || !new_val) 316 return AE_BAD_PARAMETER; 317 318 *new_val = NULL; 319 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 320 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 321 acpi_os_name); 322 *new_val = acpi_os_name; 323 } 324 325 return AE_OK; 326 } 327 328 acpi_status 329 acpi_os_table_override(struct acpi_table_header * existing_table, 330 struct acpi_table_header ** new_table) 331 { 332 if (!existing_table || !new_table) 333 return AE_BAD_PARAMETER; 334 335 *new_table = NULL; 336 337 #ifdef CONFIG_ACPI_CUSTOM_DSDT 338 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 339 *new_table = (struct acpi_table_header *)AmlCode; 340 #endif 341 if (*new_table != NULL) { 342 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 343 "this is unsafe: tainting kernel\n", 344 existing_table->signature, 345 existing_table->oem_table_id); 346 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 347 } 348 return AE_OK; 349 } 350 351 static irqreturn_t acpi_irq(int irq, void *dev_id) 352 { 353 u32 handled; 354 355 handled = (*acpi_irq_handler) (acpi_irq_context); 356 357 if (handled) { 358 acpi_irq_handled++; 359 return IRQ_HANDLED; 360 } else 361 return IRQ_NONE; 362 } 363 364 acpi_status 365 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 366 void *context) 367 { 368 unsigned int irq; 369 370 acpi_irq_stats_init(); 371 372 /* 373 * Ignore the GSI from the core, and use the value in our copy of the 374 * FADT. It may not be the same if an interrupt source override exists 375 * for the SCI. 376 */ 377 gsi = acpi_gbl_FADT.sci_interrupt; 378 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 379 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 380 gsi); 381 return AE_OK; 382 } 383 384 acpi_irq_handler = handler; 385 acpi_irq_context = context; 386 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 387 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 388 return AE_NOT_ACQUIRED; 389 } 390 acpi_irq_irq = irq; 391 392 return AE_OK; 393 } 394 395 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 396 { 397 if (irq) { 398 free_irq(irq, acpi_irq); 399 acpi_irq_handler = NULL; 400 acpi_irq_irq = 0; 401 } 402 403 return AE_OK; 404 } 405 406 /* 407 * Running in interpreter thread context, safe to sleep 408 */ 409 410 void acpi_os_sleep(acpi_integer ms) 411 { 412 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 413 } 414 415 void acpi_os_stall(u32 us) 416 { 417 while (us) { 418 u32 delay = 1000; 419 420 if (delay > us) 421 delay = us; 422 udelay(delay); 423 touch_nmi_watchdog(); 424 us -= delay; 425 } 426 } 427 428 /* 429 * Support ACPI 3.0 AML Timer operand 430 * Returns 64-bit free-running, monotonically increasing timer 431 * with 100ns granularity 432 */ 433 u64 acpi_os_get_timer(void) 434 { 435 static u64 t; 436 437 #ifdef CONFIG_HPET 438 /* TBD: use HPET if available */ 439 #endif 440 441 #ifdef CONFIG_X86_PM_TIMER 442 /* TBD: default to PM timer if HPET was not available */ 443 #endif 444 if (!t) 445 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 446 447 return ++t; 448 } 449 450 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 451 { 452 u32 dummy; 453 454 if (!value) 455 value = &dummy; 456 457 *value = 0; 458 if (width <= 8) { 459 *(u8 *) value = inb(port); 460 } else if (width <= 16) { 461 *(u16 *) value = inw(port); 462 } else if (width <= 32) { 463 *(u32 *) value = inl(port); 464 } else { 465 BUG(); 466 } 467 468 return AE_OK; 469 } 470 471 EXPORT_SYMBOL(acpi_os_read_port); 472 473 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 474 { 475 if (width <= 8) { 476 outb(value, port); 477 } else if (width <= 16) { 478 outw(value, port); 479 } else if (width <= 32) { 480 outl(value, port); 481 } else { 482 BUG(); 483 } 484 485 return AE_OK; 486 } 487 488 EXPORT_SYMBOL(acpi_os_write_port); 489 490 acpi_status 491 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 492 { 493 u32 dummy; 494 void __iomem *virt_addr; 495 496 virt_addr = ioremap(phys_addr, width); 497 if (!value) 498 value = &dummy; 499 500 switch (width) { 501 case 8: 502 *(u8 *) value = readb(virt_addr); 503 break; 504 case 16: 505 *(u16 *) value = readw(virt_addr); 506 break; 507 case 32: 508 *(u32 *) value = readl(virt_addr); 509 break; 510 default: 511 BUG(); 512 } 513 514 iounmap(virt_addr); 515 516 return AE_OK; 517 } 518 519 acpi_status 520 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 521 { 522 void __iomem *virt_addr; 523 524 virt_addr = ioremap(phys_addr, width); 525 526 switch (width) { 527 case 8: 528 writeb(value, virt_addr); 529 break; 530 case 16: 531 writew(value, virt_addr); 532 break; 533 case 32: 534 writel(value, virt_addr); 535 break; 536 default: 537 BUG(); 538 } 539 540 iounmap(virt_addr); 541 542 return AE_OK; 543 } 544 545 acpi_status 546 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 547 u32 *value, u32 width) 548 { 549 int result, size; 550 551 if (!value) 552 return AE_BAD_PARAMETER; 553 554 switch (width) { 555 case 8: 556 size = 1; 557 break; 558 case 16: 559 size = 2; 560 break; 561 case 32: 562 size = 4; 563 break; 564 default: 565 return AE_ERROR; 566 } 567 568 result = raw_pci_read(pci_id->segment, pci_id->bus, 569 PCI_DEVFN(pci_id->device, pci_id->function), 570 reg, size, value); 571 572 return (result ? AE_ERROR : AE_OK); 573 } 574 575 acpi_status 576 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 577 acpi_integer value, u32 width) 578 { 579 int result, size; 580 581 switch (width) { 582 case 8: 583 size = 1; 584 break; 585 case 16: 586 size = 2; 587 break; 588 case 32: 589 size = 4; 590 break; 591 default: 592 return AE_ERROR; 593 } 594 595 result = raw_pci_write(pci_id->segment, pci_id->bus, 596 PCI_DEVFN(pci_id->device, pci_id->function), 597 reg, size, value); 598 599 return (result ? AE_ERROR : AE_OK); 600 } 601 602 /* TODO: Change code to take advantage of driver model more */ 603 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */ 604 acpi_handle chandle, /* current node */ 605 struct acpi_pci_id **id, 606 int *is_bridge, u8 * bus_number) 607 { 608 acpi_handle handle; 609 struct acpi_pci_id *pci_id = *id; 610 acpi_status status; 611 unsigned long temp; 612 acpi_object_type type; 613 614 acpi_get_parent(chandle, &handle); 615 if (handle != rhandle) { 616 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, 617 bus_number); 618 619 status = acpi_get_type(handle, &type); 620 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE)) 621 return; 622 623 status = 624 acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, 625 &temp); 626 if (ACPI_SUCCESS(status)) { 627 u32 val; 628 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp)); 629 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp)); 630 631 if (*is_bridge) 632 pci_id->bus = *bus_number; 633 634 /* any nicer way to get bus number of bridge ? */ 635 status = 636 acpi_os_read_pci_configuration(pci_id, 0x0e, &val, 637 8); 638 if (ACPI_SUCCESS(status) 639 && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) { 640 status = 641 acpi_os_read_pci_configuration(pci_id, 0x18, 642 &val, 8); 643 if (!ACPI_SUCCESS(status)) { 644 /* Certainly broken... FIX ME */ 645 return; 646 } 647 *is_bridge = 1; 648 pci_id->bus = val; 649 status = 650 acpi_os_read_pci_configuration(pci_id, 0x19, 651 &val, 8); 652 if (ACPI_SUCCESS(status)) { 653 *bus_number = val; 654 } 655 } else 656 *is_bridge = 0; 657 } 658 } 659 } 660 661 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */ 662 acpi_handle chandle, /* current node */ 663 struct acpi_pci_id **id) 664 { 665 int is_bridge = 1; 666 u8 bus_number = (*id)->bus; 667 668 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number); 669 } 670 671 static void acpi_os_execute_deferred(struct work_struct *work) 672 { 673 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 674 if (!dpc) { 675 printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); 676 return; 677 } 678 679 dpc->function(dpc->context); 680 kfree(dpc); 681 682 return; 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 acpi_status acpi_os_execute(acpi_execute_type type, 701 acpi_osd_exec_callback function, void *context) 702 { 703 acpi_status status = AE_OK; 704 struct acpi_os_dpc *dpc; 705 struct workqueue_struct *queue; 706 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 707 "Scheduling function [%p(%p)] for deferred execution.\n", 708 function, context)); 709 710 if (!function) 711 return AE_BAD_PARAMETER; 712 713 /* 714 * Allocate/initialize DPC structure. Note that this memory will be 715 * freed by the callee. The kernel handles the work_struct list in a 716 * way that allows us to also free its memory inside the callee. 717 * Because we may want to schedule several tasks with different 718 * parameters we can't use the approach some kernel code uses of 719 * having a static work_struct. 720 */ 721 722 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 723 if (!dpc) 724 return_ACPI_STATUS(AE_NO_MEMORY); 725 726 dpc->function = function; 727 dpc->context = context; 728 729 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 730 queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq; 731 if (!queue_work(queue, &dpc->work)) { 732 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 733 "Call to queue_work() failed.\n")); 734 status = AE_ERROR; 735 kfree(dpc); 736 } 737 return_ACPI_STATUS(status); 738 } 739 740 EXPORT_SYMBOL(acpi_os_execute); 741 742 void acpi_os_wait_events_complete(void *context) 743 { 744 flush_workqueue(kacpid_wq); 745 } 746 747 EXPORT_SYMBOL(acpi_os_wait_events_complete); 748 749 /* 750 * Allocate the memory for a spinlock and initialize it. 751 */ 752 acpi_status acpi_os_create_lock(acpi_spinlock * handle) 753 { 754 spin_lock_init(*handle); 755 756 return AE_OK; 757 } 758 759 /* 760 * Deallocate the memory for a spinlock. 761 */ 762 void acpi_os_delete_lock(acpi_spinlock handle) 763 { 764 return; 765 } 766 767 acpi_status 768 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 769 { 770 struct semaphore *sem = NULL; 771 772 sem = acpi_os_allocate(sizeof(struct semaphore)); 773 if (!sem) 774 return AE_NO_MEMORY; 775 memset(sem, 0, sizeof(struct semaphore)); 776 777 sema_init(sem, initial_units); 778 779 *handle = (acpi_handle *) sem; 780 781 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 782 *handle, initial_units)); 783 784 return AE_OK; 785 } 786 787 /* 788 * TODO: A better way to delete semaphores? Linux doesn't have a 789 * 'delete_semaphore()' function -- may result in an invalid 790 * pointer dereference for non-synchronized consumers. Should 791 * we at least check for blocked threads and signal/cancel them? 792 */ 793 794 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 795 { 796 struct semaphore *sem = (struct semaphore *)handle; 797 798 if (!sem) 799 return AE_BAD_PARAMETER; 800 801 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 802 803 BUG_ON(!list_empty(&sem->wait_list)); 804 kfree(sem); 805 sem = NULL; 806 807 return AE_OK; 808 } 809 810 /* 811 * TODO: Support for units > 1? 812 */ 813 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 814 { 815 acpi_status status = AE_OK; 816 struct semaphore *sem = (struct semaphore *)handle; 817 long jiffies; 818 int ret = 0; 819 820 if (!sem || (units < 1)) 821 return AE_BAD_PARAMETER; 822 823 if (units > 1) 824 return AE_SUPPORT; 825 826 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 827 handle, units, timeout)); 828 829 if (timeout == ACPI_WAIT_FOREVER) 830 jiffies = MAX_SCHEDULE_TIMEOUT; 831 else 832 jiffies = msecs_to_jiffies(timeout); 833 834 ret = down_timeout(sem, jiffies); 835 if (ret) 836 status = AE_TIME; 837 838 if (ACPI_FAILURE(status)) { 839 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 840 "Failed to acquire semaphore[%p|%d|%d], %s", 841 handle, units, timeout, 842 acpi_format_exception(status))); 843 } else { 844 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 845 "Acquired semaphore[%p|%d|%d]", handle, 846 units, timeout)); 847 } 848 849 return status; 850 } 851 852 /* 853 * TODO: Support for units > 1? 854 */ 855 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 856 { 857 struct semaphore *sem = (struct semaphore *)handle; 858 859 if (!sem || (units < 1)) 860 return AE_BAD_PARAMETER; 861 862 if (units > 1) 863 return AE_SUPPORT; 864 865 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 866 units)); 867 868 up(sem); 869 870 return AE_OK; 871 } 872 873 #ifdef ACPI_FUTURE_USAGE 874 u32 acpi_os_get_line(char *buffer) 875 { 876 877 #ifdef ENABLE_DEBUGGER 878 if (acpi_in_debugger) { 879 u32 chars; 880 881 kdb_read(buffer, sizeof(line_buf)); 882 883 /* remove the CR kdb includes */ 884 chars = strlen(buffer) - 1; 885 buffer[chars] = '\0'; 886 } 887 #endif 888 889 return 0; 890 } 891 #endif /* ACPI_FUTURE_USAGE */ 892 893 acpi_status acpi_os_signal(u32 function, void *info) 894 { 895 switch (function) { 896 case ACPI_SIGNAL_FATAL: 897 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 898 break; 899 case ACPI_SIGNAL_BREAKPOINT: 900 /* 901 * AML Breakpoint 902 * ACPI spec. says to treat it as a NOP unless 903 * you are debugging. So if/when we integrate 904 * AML debugger into the kernel debugger its 905 * hook will go here. But until then it is 906 * not useful to print anything on breakpoints. 907 */ 908 break; 909 default: 910 break; 911 } 912 913 return AE_OK; 914 } 915 916 static int __init acpi_os_name_setup(char *str) 917 { 918 char *p = acpi_os_name; 919 int count = ACPI_MAX_OVERRIDE_LEN - 1; 920 921 if (!str || !*str) 922 return 0; 923 924 for (; count-- && str && *str; str++) { 925 if (isalnum(*str) || *str == ' ' || *str == ':') 926 *p++ = *str; 927 else if (*str == '\'' || *str == '"') 928 continue; 929 else 930 break; 931 } 932 *p = 0; 933 934 return 1; 935 936 } 937 938 __setup("acpi_os_name=", acpi_os_name_setup); 939 940 static void __init set_osi_linux(unsigned int enable) 941 { 942 if (osi_linux.enable != enable) { 943 osi_linux.enable = enable; 944 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n", 945 enable ? "Add": "Delet"); 946 } 947 return; 948 } 949 950 static void __init acpi_cmdline_osi_linux(unsigned int enable) 951 { 952 osi_linux.cmdline = 1; /* cmdline set the default */ 953 set_osi_linux(enable); 954 955 return; 956 } 957 958 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 959 { 960 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 961 962 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 963 964 if (enable == -1) 965 return; 966 967 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */ 968 969 set_osi_linux(enable); 970 971 return; 972 } 973 974 /* 975 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 976 * 977 * empty string disables _OSI 978 * string starting with '!' disables that string 979 * otherwise string is added to list, augmenting built-in strings 980 */ 981 int __init acpi_osi_setup(char *str) 982 { 983 if (str == NULL || *str == '\0') { 984 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 985 acpi_gbl_create_osi_method = FALSE; 986 } else if (!strcmp("!Linux", str)) { 987 acpi_cmdline_osi_linux(0); /* !enable */ 988 } else if (*str == '!') { 989 if (acpi_osi_invalidate(++str) == AE_OK) 990 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 991 } else if (!strcmp("Linux", str)) { 992 acpi_cmdline_osi_linux(1); /* enable */ 993 } else if (*osi_additional_string == '\0') { 994 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX); 995 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 996 } 997 998 return 1; 999 } 1000 1001 __setup("acpi_osi=", acpi_osi_setup); 1002 1003 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1004 static int __init acpi_serialize_setup(char *str) 1005 { 1006 printk(KERN_INFO PREFIX "serialize enabled\n"); 1007 1008 acpi_gbl_all_methods_serialized = TRUE; 1009 1010 return 1; 1011 } 1012 1013 __setup("acpi_serialize", acpi_serialize_setup); 1014 1015 /* 1016 * Wake and Run-Time GPES are expected to be separate. 1017 * We disable wake-GPEs at run-time to prevent spurious 1018 * interrupts. 1019 * 1020 * However, if a system exists that shares Wake and 1021 * Run-time events on the same GPE this flag is available 1022 * to tell Linux to keep the wake-time GPEs enabled at run-time. 1023 */ 1024 static int __init acpi_wake_gpes_always_on_setup(char *str) 1025 { 1026 printk(KERN_INFO PREFIX "wake GPEs not disabled\n"); 1027 1028 acpi_gbl_leave_wake_gpes_disabled = FALSE; 1029 1030 return 1; 1031 } 1032 1033 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup); 1034 1035 /* Check of resource interference between native drivers and ACPI 1036 * OperationRegions (SystemIO and System Memory only). 1037 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1038 * in arbitrary AML code and can interfere with legacy drivers. 1039 * acpi_enforce_resources= can be set to: 1040 * 1041 * - strict (2) 1042 * -> further driver trying to access the resources will not load 1043 * - lax (default) (1) 1044 * -> further driver trying to access the resources will load, but you 1045 * get a system message that something might go wrong... 1046 * 1047 * - no (0) 1048 * -> ACPI Operation Region resources will not be registered 1049 * 1050 */ 1051 #define ENFORCE_RESOURCES_STRICT 2 1052 #define ENFORCE_RESOURCES_LAX 1 1053 #define ENFORCE_RESOURCES_NO 0 1054 1055 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1056 1057 static int __init acpi_enforce_resources_setup(char *str) 1058 { 1059 if (str == NULL || *str == '\0') 1060 return 0; 1061 1062 if (!strcmp("strict", str)) 1063 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1064 else if (!strcmp("lax", str)) 1065 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1066 else if (!strcmp("no", str)) 1067 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1068 1069 return 1; 1070 } 1071 1072 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1073 1074 /* Check for resource conflicts between ACPI OperationRegions and native 1075 * drivers */ 1076 int acpi_check_resource_conflict(struct resource *res) 1077 { 1078 struct acpi_res_list *res_list_elem; 1079 int ioport; 1080 int clash = 0; 1081 1082 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1083 return 0; 1084 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1085 return 0; 1086 1087 ioport = res->flags & IORESOURCE_IO; 1088 1089 spin_lock(&acpi_res_lock); 1090 list_for_each_entry(res_list_elem, &resource_list_head, 1091 resource_list) { 1092 if (ioport && (res_list_elem->resource_type 1093 != ACPI_ADR_SPACE_SYSTEM_IO)) 1094 continue; 1095 if (!ioport && (res_list_elem->resource_type 1096 != ACPI_ADR_SPACE_SYSTEM_MEMORY)) 1097 continue; 1098 1099 if (res->end < res_list_elem->start 1100 || res_list_elem->end < res->start) 1101 continue; 1102 clash = 1; 1103 break; 1104 } 1105 spin_unlock(&acpi_res_lock); 1106 1107 if (clash) { 1108 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1109 printk("%sACPI: %s resource %s [0x%llx-0x%llx]" 1110 " conflicts with ACPI region %s" 1111 " [0x%llx-0x%llx]\n", 1112 acpi_enforce_resources == ENFORCE_RESOURCES_LAX 1113 ? KERN_WARNING : KERN_ERR, 1114 ioport ? "I/O" : "Memory", res->name, 1115 (long long) res->start, (long long) res->end, 1116 res_list_elem->name, 1117 (long long) res_list_elem->start, 1118 (long long) res_list_elem->end); 1119 printk(KERN_INFO "ACPI: Device needs an ACPI driver\n"); 1120 } 1121 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1122 return -EBUSY; 1123 } 1124 return 0; 1125 } 1126 EXPORT_SYMBOL(acpi_check_resource_conflict); 1127 1128 int acpi_check_region(resource_size_t start, resource_size_t n, 1129 const char *name) 1130 { 1131 struct resource res = { 1132 .start = start, 1133 .end = start + n - 1, 1134 .name = name, 1135 .flags = IORESOURCE_IO, 1136 }; 1137 1138 return acpi_check_resource_conflict(&res); 1139 } 1140 EXPORT_SYMBOL(acpi_check_region); 1141 1142 int acpi_check_mem_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_MEM, 1150 }; 1151 1152 return acpi_check_resource_conflict(&res); 1153 1154 } 1155 EXPORT_SYMBOL(acpi_check_mem_region); 1156 1157 /* 1158 * Acquire a spinlock. 1159 * 1160 * handle is a pointer to the spinlock_t. 1161 */ 1162 1163 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1164 { 1165 acpi_cpu_flags flags; 1166 spin_lock_irqsave(lockp, flags); 1167 return flags; 1168 } 1169 1170 /* 1171 * Release a spinlock. See above. 1172 */ 1173 1174 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1175 { 1176 spin_unlock_irqrestore(lockp, flags); 1177 } 1178 1179 #ifndef ACPI_USE_LOCAL_CACHE 1180 1181 /******************************************************************************* 1182 * 1183 * FUNCTION: acpi_os_create_cache 1184 * 1185 * PARAMETERS: name - Ascii name for the cache 1186 * size - Size of each cached object 1187 * depth - Maximum depth of the cache (in objects) <ignored> 1188 * cache - Where the new cache object is returned 1189 * 1190 * RETURN: status 1191 * 1192 * DESCRIPTION: Create a cache object 1193 * 1194 ******************************************************************************/ 1195 1196 acpi_status 1197 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1198 { 1199 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1200 if (*cache == NULL) 1201 return AE_ERROR; 1202 else 1203 return AE_OK; 1204 } 1205 1206 /******************************************************************************* 1207 * 1208 * FUNCTION: acpi_os_purge_cache 1209 * 1210 * PARAMETERS: Cache - Handle to cache object 1211 * 1212 * RETURN: Status 1213 * 1214 * DESCRIPTION: Free all objects within the requested cache. 1215 * 1216 ******************************************************************************/ 1217 1218 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1219 { 1220 kmem_cache_shrink(cache); 1221 return (AE_OK); 1222 } 1223 1224 /******************************************************************************* 1225 * 1226 * FUNCTION: acpi_os_delete_cache 1227 * 1228 * PARAMETERS: Cache - Handle to cache object 1229 * 1230 * RETURN: Status 1231 * 1232 * DESCRIPTION: Free all objects within the requested cache and delete the 1233 * cache object. 1234 * 1235 ******************************************************************************/ 1236 1237 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1238 { 1239 kmem_cache_destroy(cache); 1240 return (AE_OK); 1241 } 1242 1243 /******************************************************************************* 1244 * 1245 * FUNCTION: acpi_os_release_object 1246 * 1247 * PARAMETERS: Cache - Handle to cache object 1248 * Object - The object to be released 1249 * 1250 * RETURN: None 1251 * 1252 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1253 * the object is deleted. 1254 * 1255 ******************************************************************************/ 1256 1257 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1258 { 1259 kmem_cache_free(cache, object); 1260 return (AE_OK); 1261 } 1262 1263 /** 1264 * acpi_dmi_dump - dump DMI slots needed for blacklist entry 1265 * 1266 * Returns 0 on success 1267 */ 1268 static int acpi_dmi_dump(void) 1269 { 1270 1271 if (!dmi_available) 1272 return -1; 1273 1274 printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n", 1275 dmi_get_system_info(DMI_SYS_VENDOR)); 1276 printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n", 1277 dmi_get_system_info(DMI_PRODUCT_NAME)); 1278 printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n", 1279 dmi_get_system_info(DMI_PRODUCT_VERSION)); 1280 printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n", 1281 dmi_get_system_info(DMI_BOARD_NAME)); 1282 printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n", 1283 dmi_get_system_info(DMI_BIOS_VENDOR)); 1284 printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n", 1285 dmi_get_system_info(DMI_BIOS_DATE)); 1286 1287 return 0; 1288 } 1289 1290 1291 /****************************************************************************** 1292 * 1293 * FUNCTION: acpi_os_validate_interface 1294 * 1295 * PARAMETERS: interface - Requested interface to be validated 1296 * 1297 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise 1298 * 1299 * DESCRIPTION: Match an interface string to the interfaces supported by the 1300 * host. Strings originate from an AML call to the _OSI method. 1301 * 1302 *****************************************************************************/ 1303 1304 acpi_status 1305 acpi_os_validate_interface (char *interface) 1306 { 1307 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX)) 1308 return AE_OK; 1309 if (!strcmp("Linux", interface)) { 1310 1311 printk(KERN_NOTICE PREFIX 1312 "BIOS _OSI(Linux) query %s%s\n", 1313 osi_linux.enable ? "honored" : "ignored", 1314 osi_linux.cmdline ? " via cmdline" : 1315 osi_linux.dmi ? " via DMI" : ""); 1316 1317 if (!osi_linux.dmi) { 1318 if (acpi_dmi_dump()) 1319 printk(KERN_NOTICE PREFIX 1320 "[please extract dmidecode output]\n"); 1321 printk(KERN_NOTICE PREFIX 1322 "Please send DMI info above to " 1323 "linux-acpi@vger.kernel.org\n"); 1324 } 1325 if (!osi_linux.known && !osi_linux.cmdline) { 1326 printk(KERN_NOTICE PREFIX 1327 "If \"acpi_osi=%sLinux\" works better, " 1328 "please notify linux-acpi@vger.kernel.org\n", 1329 osi_linux.enable ? "!" : ""); 1330 } 1331 1332 if (osi_linux.enable) 1333 return AE_OK; 1334 } 1335 return AE_SUPPORT; 1336 } 1337 1338 /****************************************************************************** 1339 * 1340 * FUNCTION: acpi_os_validate_address 1341 * 1342 * PARAMETERS: space_id - ACPI space ID 1343 * address - Physical address 1344 * length - Address length 1345 * 1346 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1347 * should return AE_AML_ILLEGAL_ADDRESS. 1348 * 1349 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1350 * the addresses accessed by AML operation regions. 1351 * 1352 *****************************************************************************/ 1353 1354 acpi_status 1355 acpi_os_validate_address ( 1356 u8 space_id, 1357 acpi_physical_address address, 1358 acpi_size length, 1359 char *name) 1360 { 1361 struct acpi_res_list *res; 1362 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1363 return AE_OK; 1364 1365 switch (space_id) { 1366 case ACPI_ADR_SPACE_SYSTEM_IO: 1367 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1368 /* Only interference checks against SystemIO and SytemMemory 1369 are needed */ 1370 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL); 1371 if (!res) 1372 return AE_OK; 1373 /* ACPI names are fixed to 4 bytes, still better use strlcpy */ 1374 strlcpy(res->name, name, 5); 1375 res->start = address; 1376 res->end = address + length - 1; 1377 res->resource_type = space_id; 1378 spin_lock(&acpi_res_lock); 1379 list_add(&res->resource_list, &resource_list_head); 1380 spin_unlock(&acpi_res_lock); 1381 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, " 1382 "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO) 1383 ? "SystemIO" : "System Memory", 1384 (unsigned long long)res->start, 1385 (unsigned long long)res->end, 1386 res->name); 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 #endif 1401