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/highmem.h> 35#include <linux/pci.h> 36#include <linux/interrupt.h> 37#include <linux/kmod.h> 38#include <linux/delay.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 "internal.h" 52 53#define _COMPONENT ACPI_OS_SERVICES 54ACPI_MODULE_NAME("osl"); 55 56struct acpi_os_dpc { 57 acpi_osd_exec_callback function; 58 void *context; 59 struct work_struct work; 60}; 61 62#ifdef CONFIG_ACPI_CUSTOM_DSDT 63#include CONFIG_ACPI_CUSTOM_DSDT_FILE 64#endif 65 66#ifdef ENABLE_DEBUGGER 67#include <linux/kdb.h> 68 69/* stuff for debugger support */ 70int acpi_in_debugger; 71EXPORT_SYMBOL(acpi_in_debugger); 72 73extern char line_buf[80]; 74#endif /*ENABLE_DEBUGGER */ 75 76static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl, 77 u32 pm1b_ctrl); 78static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a, 79 u32 val_b); 80 81static acpi_osd_handler acpi_irq_handler; 82static void *acpi_irq_context; 83static struct workqueue_struct *kacpid_wq; 84static struct workqueue_struct *kacpi_notify_wq; 85static struct workqueue_struct *kacpi_hotplug_wq; 86 87/* 88 * This list of permanent mappings is for memory that may be accessed from 89 * interrupt context, where we can't do the ioremap(). 90 */ 91struct acpi_ioremap { 92 struct list_head list; 93 void __iomem *virt; 94 acpi_physical_address phys; 95 acpi_size size; 96 unsigned long refcount; 97}; 98 99static LIST_HEAD(acpi_ioremaps); 100static DEFINE_MUTEX(acpi_ioremap_lock); 101 102static void __init acpi_osi_setup_late(void); 103 104/* 105 * The story of _OSI(Linux) 106 * 107 * From pre-history through Linux-2.6.22, 108 * Linux responded TRUE upon a BIOS OSI(Linux) query. 109 * 110 * Unfortunately, reference BIOS writers got wind of this 111 * and put OSI(Linux) in their example code, quickly exposing 112 * this string as ill-conceived and opening the door to 113 * an un-bounded number of BIOS incompatibilities. 114 * 115 * For example, OSI(Linux) was used on resume to re-POST a 116 * video card on one system, because Linux at that time 117 * could not do a speedy restore in its native driver. 118 * But then upon gaining quick native restore capability, 119 * Linux has no way to tell the BIOS to skip the time-consuming 120 * POST -- putting Linux at a permanent performance disadvantage. 121 * On another system, the BIOS writer used OSI(Linux) 122 * to infer native OS support for IPMI! On other systems, 123 * OSI(Linux) simply got in the way of Linux claiming to 124 * be compatible with other operating systems, exposing 125 * BIOS issues such as skipped device initialization. 126 * 127 * So "Linux" turned out to be a really poor chose of 128 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 129 * 130 * BIOS writers should NOT query _OSI(Linux) on future systems. 131 * Linux will complain on the console when it sees it, and return FALSE. 132 * To get Linux to return TRUE for your system will require 133 * a kernel source update to add a DMI entry, 134 * or boot with "acpi_osi=Linux" 135 */ 136 137static struct osi_linux { 138 unsigned int enable:1; 139 unsigned int dmi:1; 140 unsigned int cmdline:1; 141 u8 default_disabling; 142} osi_linux = {0, 0, 0, 0}; 143 144static u32 acpi_osi_handler(acpi_string interface, u32 supported) 145{ 146 if (!strcmp("Linux", interface)) { 147 148 printk_once(KERN_NOTICE FW_BUG PREFIX 149 "BIOS _OSI(Linux) query %s%s\n", 150 osi_linux.enable ? "honored" : "ignored", 151 osi_linux.cmdline ? " via cmdline" : 152 osi_linux.dmi ? " via DMI" : ""); 153 } 154 155 if (!strcmp("Darwin", interface)) { 156 /* 157 * Apple firmware will behave poorly if it receives positive 158 * answers to "Darwin" and any other OS. Respond positively 159 * to Darwin and then disable all other vendor strings. 160 */ 161 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 162 supported = ACPI_UINT32_MAX; 163 } 164 165 return supported; 166} 167 168static void __init acpi_request_region (struct acpi_generic_address *gas, 169 unsigned int length, char *desc) 170{ 171 u64 addr; 172 173 /* Handle possible alignment issues */ 174 memcpy(&addr, &gas->address, sizeof(addr)); 175 if (!addr || !length) 176 return; 177 178 /* Resources are never freed */ 179 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 180 request_region(addr, length, desc); 181 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 182 request_mem_region(addr, length, desc); 183} 184 185static int __init acpi_reserve_resources(void) 186{ 187 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 188 "ACPI PM1a_EVT_BLK"); 189 190 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 191 "ACPI PM1b_EVT_BLK"); 192 193 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 194 "ACPI PM1a_CNT_BLK"); 195 196 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 197 "ACPI PM1b_CNT_BLK"); 198 199 if (acpi_gbl_FADT.pm_timer_length == 4) 200 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 201 202 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 203 "ACPI PM2_CNT_BLK"); 204 205 /* Length of GPE blocks must be a non-negative multiple of 2 */ 206 207 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 208 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 209 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 210 211 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 212 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 213 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 214 215 return 0; 216} 217fs_initcall_sync(acpi_reserve_resources); 218 219void 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 227void 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#ifdef CONFIG_KEXEC 245static unsigned long acpi_rsdp; 246static int __init setup_acpi_rsdp(char *arg) 247{ 248 if (kstrtoul(arg, 16, &acpi_rsdp)) 249 return -EINVAL; 250 return 0; 251} 252early_param("acpi_rsdp", setup_acpi_rsdp); 253#endif 254 255acpi_physical_address __init acpi_os_get_root_pointer(void) 256{ 257#ifdef CONFIG_KEXEC 258 if (acpi_rsdp) 259 return acpi_rsdp; 260#endif 261 262 if (efi_enabled(EFI_CONFIG_TABLES)) { 263 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 264 return efi.acpi20; 265 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 266 return efi.acpi; 267 else { 268 printk(KERN_ERR PREFIX 269 "System description tables not found\n"); 270 return 0; 271 } 272 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) { 273 acpi_physical_address pa = 0; 274 275 acpi_find_root_pointer(&pa); 276 return pa; 277 } 278 279 return 0; 280} 281 282/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 283static struct acpi_ioremap * 284acpi_map_lookup(acpi_physical_address phys, acpi_size size) 285{ 286 struct acpi_ioremap *map; 287 288 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 289 if (map->phys <= phys && 290 phys + size <= map->phys + map->size) 291 return map; 292 293 return NULL; 294} 295 296/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 297static void __iomem * 298acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 299{ 300 struct acpi_ioremap *map; 301 302 map = acpi_map_lookup(phys, size); 303 if (map) 304 return map->virt + (phys - map->phys); 305 306 return NULL; 307} 308 309void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 310{ 311 struct acpi_ioremap *map; 312 void __iomem *virt = NULL; 313 314 mutex_lock(&acpi_ioremap_lock); 315 map = acpi_map_lookup(phys, size); 316 if (map) { 317 virt = map->virt + (phys - map->phys); 318 map->refcount++; 319 } 320 mutex_unlock(&acpi_ioremap_lock); 321 return virt; 322} 323EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 324 325/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 326static struct acpi_ioremap * 327acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 328{ 329 struct acpi_ioremap *map; 330 331 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 332 if (map->virt <= virt && 333 virt + size <= map->virt + map->size) 334 return map; 335 336 return NULL; 337} 338 339#if defined(CONFIG_IA64) || defined(CONFIG_ARM64) 340/* ioremap will take care of cache attributes */ 341#define should_use_kmap(pfn) 0 342#else 343#define should_use_kmap(pfn) page_is_ram(pfn) 344#endif 345 346static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 347{ 348 unsigned long pfn; 349 350 pfn = pg_off >> PAGE_SHIFT; 351 if (should_use_kmap(pfn)) { 352 if (pg_sz > PAGE_SIZE) 353 return NULL; 354 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 355 } else 356 return acpi_os_ioremap(pg_off, pg_sz); 357} 358 359static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 360{ 361 unsigned long pfn; 362 363 pfn = pg_off >> PAGE_SHIFT; 364 if (should_use_kmap(pfn)) 365 kunmap(pfn_to_page(pfn)); 366 else 367 iounmap(vaddr); 368} 369 370void __iomem *__init_refok 371acpi_os_map_iomem(acpi_physical_address phys, acpi_size size) 372{ 373 struct acpi_ioremap *map; 374 void __iomem *virt; 375 acpi_physical_address pg_off; 376 acpi_size pg_sz; 377 378 if (phys > ULONG_MAX) { 379 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 380 return NULL; 381 } 382 383 if (!acpi_gbl_permanent_mmap) 384 return __acpi_map_table((unsigned long)phys, size); 385 386 mutex_lock(&acpi_ioremap_lock); 387 /* Check if there's a suitable mapping already. */ 388 map = acpi_map_lookup(phys, size); 389 if (map) { 390 map->refcount++; 391 goto out; 392 } 393 394 map = kzalloc(sizeof(*map), GFP_KERNEL); 395 if (!map) { 396 mutex_unlock(&acpi_ioremap_lock); 397 return NULL; 398 } 399 400 pg_off = round_down(phys, PAGE_SIZE); 401 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 402 virt = acpi_map(pg_off, pg_sz); 403 if (!virt) { 404 mutex_unlock(&acpi_ioremap_lock); 405 kfree(map); 406 return NULL; 407 } 408 409 INIT_LIST_HEAD(&map->list); 410 map->virt = virt; 411 map->phys = pg_off; 412 map->size = pg_sz; 413 map->refcount = 1; 414 415 list_add_tail_rcu(&map->list, &acpi_ioremaps); 416 417out: 418 mutex_unlock(&acpi_ioremap_lock); 419 return map->virt + (phys - map->phys); 420} 421EXPORT_SYMBOL_GPL(acpi_os_map_iomem); 422 423void *__init_refok 424acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 425{ 426 return (void *)acpi_os_map_iomem(phys, size); 427} 428EXPORT_SYMBOL_GPL(acpi_os_map_memory); 429 430static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 431{ 432 if (!--map->refcount) 433 list_del_rcu(&map->list); 434} 435 436static void acpi_os_map_cleanup(struct acpi_ioremap *map) 437{ 438 if (!map->refcount) { 439 synchronize_rcu_expedited(); 440 acpi_unmap(map->phys, map->virt); 441 kfree(map); 442 } 443} 444 445void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) 446{ 447 struct acpi_ioremap *map; 448 449 if (!acpi_gbl_permanent_mmap) { 450 __acpi_unmap_table(virt, size); 451 return; 452 } 453 454 mutex_lock(&acpi_ioremap_lock); 455 map = acpi_map_lookup_virt(virt, size); 456 if (!map) { 457 mutex_unlock(&acpi_ioremap_lock); 458 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 459 return; 460 } 461 acpi_os_drop_map_ref(map); 462 mutex_unlock(&acpi_ioremap_lock); 463 464 acpi_os_map_cleanup(map); 465} 466EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem); 467 468void __ref acpi_os_unmap_memory(void *virt, acpi_size size) 469{ 470 return acpi_os_unmap_iomem((void __iomem *)virt, size); 471} 472EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 473 474void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 475{ 476 if (!acpi_gbl_permanent_mmap) 477 __acpi_unmap_table(virt, size); 478} 479 480int acpi_os_map_generic_address(struct acpi_generic_address *gas) 481{ 482 u64 addr; 483 void __iomem *virt; 484 485 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 486 return 0; 487 488 /* Handle possible alignment issues */ 489 memcpy(&addr, &gas->address, sizeof(addr)); 490 if (!addr || !gas->bit_width) 491 return -EINVAL; 492 493 virt = acpi_os_map_iomem(addr, gas->bit_width / 8); 494 if (!virt) 495 return -EIO; 496 497 return 0; 498} 499EXPORT_SYMBOL(acpi_os_map_generic_address); 500 501void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 502{ 503 u64 addr; 504 struct acpi_ioremap *map; 505 506 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 507 return; 508 509 /* Handle possible alignment issues */ 510 memcpy(&addr, &gas->address, sizeof(addr)); 511 if (!addr || !gas->bit_width) 512 return; 513 514 mutex_lock(&acpi_ioremap_lock); 515 map = acpi_map_lookup(addr, gas->bit_width / 8); 516 if (!map) { 517 mutex_unlock(&acpi_ioremap_lock); 518 return; 519 } 520 acpi_os_drop_map_ref(map); 521 mutex_unlock(&acpi_ioremap_lock); 522 523 acpi_os_map_cleanup(map); 524} 525EXPORT_SYMBOL(acpi_os_unmap_generic_address); 526 527#ifdef ACPI_FUTURE_USAGE 528acpi_status 529acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 530{ 531 if (!phys || !virt) 532 return AE_BAD_PARAMETER; 533 534 *phys = virt_to_phys(virt); 535 536 return AE_OK; 537} 538#endif 539 540#define ACPI_MAX_OVERRIDE_LEN 100 541 542static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 543 544acpi_status 545acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 546 acpi_string * new_val) 547{ 548 if (!init_val || !new_val) 549 return AE_BAD_PARAMETER; 550 551 *new_val = NULL; 552 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 553 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 554 acpi_os_name); 555 *new_val = acpi_os_name; 556 } 557 558 return AE_OK; 559} 560 561#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 562#include <linux/earlycpio.h> 563#include <linux/memblock.h> 564 565static u64 acpi_tables_addr; 566static int all_tables_size; 567 568/* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 569static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 570{ 571 u8 sum = 0; 572 u8 *end = buffer + length; 573 574 while (buffer < end) 575 sum = (u8) (sum + *(buffer++)); 576 return sum; 577} 578 579/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 580static const char * const table_sigs[] = { 581 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 582 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 583 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 584 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 585 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 586 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 587 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 588 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 589 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 590 591#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 592 593#define ACPI_OVERRIDE_TABLES 64 594static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 595 596#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 597 598void __init acpi_initrd_override(void *data, size_t size) 599{ 600 int sig, no, table_nr = 0, total_offset = 0; 601 long offset = 0; 602 struct acpi_table_header *table; 603 char cpio_path[32] = "kernel/firmware/acpi/"; 604 struct cpio_data file; 605 606 if (data == NULL || size == 0) 607 return; 608 609 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 610 file = find_cpio_data(cpio_path, data, size, &offset); 611 if (!file.data) 612 break; 613 614 data += offset; 615 size -= offset; 616 617 if (file.size < sizeof(struct acpi_table_header)) { 618 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 619 cpio_path, file.name); 620 continue; 621 } 622 623 table = file.data; 624 625 for (sig = 0; table_sigs[sig]; sig++) 626 if (!memcmp(table->signature, table_sigs[sig], 4)) 627 break; 628 629 if (!table_sigs[sig]) { 630 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 631 cpio_path, file.name); 632 continue; 633 } 634 if (file.size != table->length) { 635 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 636 cpio_path, file.name); 637 continue; 638 } 639 if (acpi_table_checksum(file.data, table->length)) { 640 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 641 cpio_path, file.name); 642 continue; 643 } 644 645 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 646 table->signature, cpio_path, file.name, table->length); 647 648 all_tables_size += table->length; 649 acpi_initrd_files[table_nr].data = file.data; 650 acpi_initrd_files[table_nr].size = file.size; 651 table_nr++; 652 } 653 if (table_nr == 0) 654 return; 655 656 acpi_tables_addr = 657 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 658 all_tables_size, PAGE_SIZE); 659 if (!acpi_tables_addr) { 660 WARN_ON(1); 661 return; 662 } 663 /* 664 * Only calling e820_add_reserve does not work and the 665 * tables are invalid (memory got used) later. 666 * memblock_reserve works as expected and the tables won't get modified. 667 * But it's not enough on X86 because ioremap will 668 * complain later (used by acpi_os_map_memory) that the pages 669 * that should get mapped are not marked "reserved". 670 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 671 * works fine. 672 */ 673 memblock_reserve(acpi_tables_addr, all_tables_size); 674 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 675 676 /* 677 * early_ioremap only can remap 256k one time. If we map all 678 * tables one time, we will hit the limit. Need to map chunks 679 * one by one during copying the same as that in relocate_initrd(). 680 */ 681 for (no = 0; no < table_nr; no++) { 682 unsigned char *src_p = acpi_initrd_files[no].data; 683 phys_addr_t size = acpi_initrd_files[no].size; 684 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 685 phys_addr_t slop, clen; 686 char *dest_p; 687 688 total_offset += size; 689 690 while (size) { 691 slop = dest_addr & ~PAGE_MASK; 692 clen = size; 693 if (clen > MAP_CHUNK_SIZE - slop) 694 clen = MAP_CHUNK_SIZE - slop; 695 dest_p = early_ioremap(dest_addr & PAGE_MASK, 696 clen + slop); 697 memcpy(dest_p + slop, src_p, clen); 698 early_iounmap(dest_p, clen + slop); 699 src_p += clen; 700 dest_addr += clen; 701 size -= clen; 702 } 703 } 704} 705#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 706 707static void acpi_table_taint(struct acpi_table_header *table) 708{ 709 pr_warn(PREFIX 710 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 711 table->signature, table->oem_table_id); 712 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 713} 714 715 716acpi_status 717acpi_os_table_override(struct acpi_table_header * existing_table, 718 struct acpi_table_header ** new_table) 719{ 720 if (!existing_table || !new_table) 721 return AE_BAD_PARAMETER; 722 723 *new_table = NULL; 724 725#ifdef CONFIG_ACPI_CUSTOM_DSDT 726 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 727 *new_table = (struct acpi_table_header *)AmlCode; 728#endif 729 if (*new_table != NULL) 730 acpi_table_taint(existing_table); 731 return AE_OK; 732} 733 734acpi_status 735acpi_os_physical_table_override(struct acpi_table_header *existing_table, 736 acpi_physical_address *address, 737 u32 *table_length) 738{ 739#ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 740 *table_length = 0; 741 *address = 0; 742 return AE_OK; 743#else 744 int table_offset = 0; 745 struct acpi_table_header *table; 746 747 *table_length = 0; 748 *address = 0; 749 750 if (!acpi_tables_addr) 751 return AE_OK; 752 753 do { 754 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 755 WARN_ON(1); 756 return AE_OK; 757 } 758 759 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 760 ACPI_HEADER_SIZE); 761 762 if (table_offset + table->length > all_tables_size) { 763 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 764 WARN_ON(1); 765 return AE_OK; 766 } 767 768 table_offset += table->length; 769 770 if (memcmp(existing_table->signature, table->signature, 4)) { 771 acpi_os_unmap_memory(table, 772 ACPI_HEADER_SIZE); 773 continue; 774 } 775 776 /* Only override tables with matching oem id */ 777 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 778 ACPI_OEM_TABLE_ID_SIZE)) { 779 acpi_os_unmap_memory(table, 780 ACPI_HEADER_SIZE); 781 continue; 782 } 783 784 table_offset -= table->length; 785 *table_length = table->length; 786 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 787 *address = acpi_tables_addr + table_offset; 788 break; 789 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 790 791 if (*address != 0) 792 acpi_table_taint(existing_table); 793 return AE_OK; 794#endif 795} 796 797static irqreturn_t acpi_irq(int irq, void *dev_id) 798{ 799 u32 handled; 800 801 handled = (*acpi_irq_handler) (acpi_irq_context); 802 803 if (handled) { 804 acpi_irq_handled++; 805 return IRQ_HANDLED; 806 } else { 807 acpi_irq_not_handled++; 808 return IRQ_NONE; 809 } 810} 811 812acpi_status 813acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 814 void *context) 815{ 816 unsigned int irq; 817 818 acpi_irq_stats_init(); 819 820 /* 821 * ACPI interrupts different from the SCI in our copy of the FADT are 822 * not supported. 823 */ 824 if (gsi != acpi_gbl_FADT.sci_interrupt) 825 return AE_BAD_PARAMETER; 826 827 if (acpi_irq_handler) 828 return AE_ALREADY_ACQUIRED; 829 830 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 831 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 832 gsi); 833 return AE_OK; 834 } 835 836 acpi_irq_handler = handler; 837 acpi_irq_context = context; 838 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 839 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 840 acpi_irq_handler = NULL; 841 return AE_NOT_ACQUIRED; 842 } 843 844 return AE_OK; 845} 846 847acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 848{ 849 if (irq != acpi_gbl_FADT.sci_interrupt) 850 return AE_BAD_PARAMETER; 851 852 free_irq(irq, acpi_irq); 853 acpi_irq_handler = NULL; 854 855 return AE_OK; 856} 857 858/* 859 * Running in interpreter thread context, safe to sleep 860 */ 861 862void acpi_os_sleep(u64 ms) 863{ 864 msleep(ms); 865} 866 867void acpi_os_stall(u32 us) 868{ 869 while (us) { 870 u32 delay = 1000; 871 872 if (delay > us) 873 delay = us; 874 udelay(delay); 875 touch_nmi_watchdog(); 876 us -= delay; 877 } 878} 879 880/* 881 * Support ACPI 3.0 AML Timer operand 882 * Returns 64-bit free-running, monotonically increasing timer 883 * with 100ns granularity 884 */ 885u64 acpi_os_get_timer(void) 886{ 887 u64 time_ns = ktime_to_ns(ktime_get()); 888 do_div(time_ns, 100); 889 return time_ns; 890} 891 892acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 893{ 894 u32 dummy; 895 896 if (!value) 897 value = &dummy; 898 899 *value = 0; 900 if (width <= 8) { 901 *(u8 *) value = inb(port); 902 } else if (width <= 16) { 903 *(u16 *) value = inw(port); 904 } else if (width <= 32) { 905 *(u32 *) value = inl(port); 906 } else { 907 BUG(); 908 } 909 910 return AE_OK; 911} 912 913EXPORT_SYMBOL(acpi_os_read_port); 914 915acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 916{ 917 if (width <= 8) { 918 outb(value, port); 919 } else if (width <= 16) { 920 outw(value, port); 921 } else if (width <= 32) { 922 outl(value, port); 923 } else { 924 BUG(); 925 } 926 927 return AE_OK; 928} 929 930EXPORT_SYMBOL(acpi_os_write_port); 931 932#ifdef readq 933static inline u64 read64(const volatile void __iomem *addr) 934{ 935 return readq(addr); 936} 937#else 938static inline u64 read64(const volatile void __iomem *addr) 939{ 940 u64 l, h; 941 l = readl(addr); 942 h = readl(addr+4); 943 return l | (h << 32); 944} 945#endif 946 947acpi_status 948acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 949{ 950 void __iomem *virt_addr; 951 unsigned int size = width / 8; 952 bool unmap = false; 953 u64 dummy; 954 955 rcu_read_lock(); 956 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 957 if (!virt_addr) { 958 rcu_read_unlock(); 959 virt_addr = acpi_os_ioremap(phys_addr, size); 960 if (!virt_addr) 961 return AE_BAD_ADDRESS; 962 unmap = true; 963 } 964 965 if (!value) 966 value = &dummy; 967 968 switch (width) { 969 case 8: 970 *(u8 *) value = readb(virt_addr); 971 break; 972 case 16: 973 *(u16 *) value = readw(virt_addr); 974 break; 975 case 32: 976 *(u32 *) value = readl(virt_addr); 977 break; 978 case 64: 979 *(u64 *) value = read64(virt_addr); 980 break; 981 default: 982 BUG(); 983 } 984 985 if (unmap) 986 iounmap(virt_addr); 987 else 988 rcu_read_unlock(); 989 990 return AE_OK; 991} 992 993#ifdef writeq 994static inline void write64(u64 val, volatile void __iomem *addr) 995{ 996 writeq(val, addr); 997} 998#else 999static inline void write64(u64 val, volatile void __iomem *addr) 1000{ 1001 writel(val, addr); 1002 writel(val>>32, addr+4); 1003} 1004#endif 1005 1006acpi_status 1007acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 1008{ 1009 void __iomem *virt_addr; 1010 unsigned int size = width / 8; 1011 bool unmap = false; 1012 1013 rcu_read_lock(); 1014 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1015 if (!virt_addr) { 1016 rcu_read_unlock(); 1017 virt_addr = acpi_os_ioremap(phys_addr, size); 1018 if (!virt_addr) 1019 return AE_BAD_ADDRESS; 1020 unmap = true; 1021 } 1022 1023 switch (width) { 1024 case 8: 1025 writeb(value, virt_addr); 1026 break; 1027 case 16: 1028 writew(value, virt_addr); 1029 break; 1030 case 32: 1031 writel(value, virt_addr); 1032 break; 1033 case 64: 1034 write64(value, virt_addr); 1035 break; 1036 default: 1037 BUG(); 1038 } 1039 1040 if (unmap) 1041 iounmap(virt_addr); 1042 else 1043 rcu_read_unlock(); 1044 1045 return AE_OK; 1046} 1047 1048acpi_status 1049acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1050 u64 *value, u32 width) 1051{ 1052 int result, size; 1053 u32 value32; 1054 1055 if (!value) 1056 return AE_BAD_PARAMETER; 1057 1058 switch (width) { 1059 case 8: 1060 size = 1; 1061 break; 1062 case 16: 1063 size = 2; 1064 break; 1065 case 32: 1066 size = 4; 1067 break; 1068 default: 1069 return AE_ERROR; 1070 } 1071 1072 result = raw_pci_read(pci_id->segment, pci_id->bus, 1073 PCI_DEVFN(pci_id->device, pci_id->function), 1074 reg, size, &value32); 1075 *value = value32; 1076 1077 return (result ? AE_ERROR : AE_OK); 1078} 1079 1080acpi_status 1081acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1082 u64 value, u32 width) 1083{ 1084 int result, size; 1085 1086 switch (width) { 1087 case 8: 1088 size = 1; 1089 break; 1090 case 16: 1091 size = 2; 1092 break; 1093 case 32: 1094 size = 4; 1095 break; 1096 default: 1097 return AE_ERROR; 1098 } 1099 1100 result = raw_pci_write(pci_id->segment, pci_id->bus, 1101 PCI_DEVFN(pci_id->device, pci_id->function), 1102 reg, size, value); 1103 1104 return (result ? AE_ERROR : AE_OK); 1105} 1106 1107static void acpi_os_execute_deferred(struct work_struct *work) 1108{ 1109 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1110 1111 dpc->function(dpc->context); 1112 kfree(dpc); 1113} 1114 1115/******************************************************************************* 1116 * 1117 * FUNCTION: acpi_os_execute 1118 * 1119 * PARAMETERS: Type - Type of the callback 1120 * Function - Function to be executed 1121 * Context - Function parameters 1122 * 1123 * RETURN: Status 1124 * 1125 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1126 * immediately executes function on a separate thread. 1127 * 1128 ******************************************************************************/ 1129 1130acpi_status acpi_os_execute(acpi_execute_type type, 1131 acpi_osd_exec_callback function, void *context) 1132{ 1133 acpi_status status = AE_OK; 1134 struct acpi_os_dpc *dpc; 1135 struct workqueue_struct *queue; 1136 int ret; 1137 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1138 "Scheduling function [%p(%p)] for deferred execution.\n", 1139 function, context)); 1140 1141 /* 1142 * Allocate/initialize DPC structure. Note that this memory will be 1143 * freed by the callee. The kernel handles the work_struct list in a 1144 * way that allows us to also free its memory inside the callee. 1145 * Because we may want to schedule several tasks with different 1146 * parameters we can't use the approach some kernel code uses of 1147 * having a static work_struct. 1148 */ 1149 1150 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1151 if (!dpc) 1152 return AE_NO_MEMORY; 1153 1154 dpc->function = function; 1155 dpc->context = context; 1156 1157 /* 1158 * To prevent lockdep from complaining unnecessarily, make sure that 1159 * there is a different static lockdep key for each workqueue by using 1160 * INIT_WORK() for each of them separately. 1161 */ 1162 if (type == OSL_NOTIFY_HANDLER) { 1163 queue = kacpi_notify_wq; 1164 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1165 } else { 1166 queue = kacpid_wq; 1167 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1168 } 1169 1170 /* 1171 * On some machines, a software-initiated SMI causes corruption unless 1172 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1173 * typically it's done in GPE-related methods that are run via 1174 * workqueues, so we can avoid the known corruption cases by always 1175 * queueing on CPU 0. 1176 */ 1177 ret = queue_work_on(0, queue, &dpc->work); 1178 1179 if (!ret) { 1180 printk(KERN_ERR PREFIX 1181 "Call to queue_work() failed.\n"); 1182 status = AE_ERROR; 1183 kfree(dpc); 1184 } 1185 return status; 1186} 1187EXPORT_SYMBOL(acpi_os_execute); 1188 1189void acpi_os_wait_events_complete(void) 1190{ 1191 /* 1192 * Make sure the GPE handler or the fixed event handler is not used 1193 * on another CPU after removal. 1194 */ 1195 if (acpi_irq_handler) 1196 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt); 1197 flush_workqueue(kacpid_wq); 1198 flush_workqueue(kacpi_notify_wq); 1199} 1200 1201struct acpi_hp_work { 1202 struct work_struct work; 1203 struct acpi_device *adev; 1204 u32 src; 1205}; 1206 1207static void acpi_hotplug_work_fn(struct work_struct *work) 1208{ 1209 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1210 1211 acpi_os_wait_events_complete(); 1212 acpi_device_hotplug(hpw->adev, hpw->src); 1213 kfree(hpw); 1214} 1215 1216acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1217{ 1218 struct acpi_hp_work *hpw; 1219 1220 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1221 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1222 adev, src)); 1223 1224 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1225 if (!hpw) 1226 return AE_NO_MEMORY; 1227 1228 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1229 hpw->adev = adev; 1230 hpw->src = src; 1231 /* 1232 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1233 * the hotplug code may call driver .remove() functions, which may 1234 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1235 * these workqueues. 1236 */ 1237 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1238 kfree(hpw); 1239 return AE_ERROR; 1240 } 1241 return AE_OK; 1242} 1243 1244bool acpi_queue_hotplug_work(struct work_struct *work) 1245{ 1246 return queue_work(kacpi_hotplug_wq, work); 1247} 1248 1249acpi_status 1250acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1251{ 1252 struct semaphore *sem = NULL; 1253 1254 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1255 if (!sem) 1256 return AE_NO_MEMORY; 1257 1258 sema_init(sem, initial_units); 1259 1260 *handle = (acpi_handle *) sem; 1261 1262 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1263 *handle, initial_units)); 1264 1265 return AE_OK; 1266} 1267 1268/* 1269 * TODO: A better way to delete semaphores? Linux doesn't have a 1270 * 'delete_semaphore()' function -- may result in an invalid 1271 * pointer dereference for non-synchronized consumers. Should 1272 * we at least check for blocked threads and signal/cancel them? 1273 */ 1274 1275acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1276{ 1277 struct semaphore *sem = (struct semaphore *)handle; 1278 1279 if (!sem) 1280 return AE_BAD_PARAMETER; 1281 1282 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1283 1284 BUG_ON(!list_empty(&sem->wait_list)); 1285 kfree(sem); 1286 sem = NULL; 1287 1288 return AE_OK; 1289} 1290 1291/* 1292 * TODO: Support for units > 1? 1293 */ 1294acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1295{ 1296 acpi_status status = AE_OK; 1297 struct semaphore *sem = (struct semaphore *)handle; 1298 long jiffies; 1299 int ret = 0; 1300 1301 if (!sem || (units < 1)) 1302 return AE_BAD_PARAMETER; 1303 1304 if (units > 1) 1305 return AE_SUPPORT; 1306 1307 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1308 handle, units, timeout)); 1309 1310 if (timeout == ACPI_WAIT_FOREVER) 1311 jiffies = MAX_SCHEDULE_TIMEOUT; 1312 else 1313 jiffies = msecs_to_jiffies(timeout); 1314 1315 ret = down_timeout(sem, jiffies); 1316 if (ret) 1317 status = AE_TIME; 1318 1319 if (ACPI_FAILURE(status)) { 1320 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1321 "Failed to acquire semaphore[%p|%d|%d], %s", 1322 handle, units, timeout, 1323 acpi_format_exception(status))); 1324 } else { 1325 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1326 "Acquired semaphore[%p|%d|%d]", handle, 1327 units, timeout)); 1328 } 1329 1330 return status; 1331} 1332 1333/* 1334 * TODO: Support for units > 1? 1335 */ 1336acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1337{ 1338 struct semaphore *sem = (struct semaphore *)handle; 1339 1340 if (!sem || (units < 1)) 1341 return AE_BAD_PARAMETER; 1342 1343 if (units > 1) 1344 return AE_SUPPORT; 1345 1346 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1347 units)); 1348 1349 up(sem); 1350 1351 return AE_OK; 1352} 1353 1354#ifdef ACPI_FUTURE_USAGE 1355u32 acpi_os_get_line(char *buffer) 1356{ 1357 1358#ifdef ENABLE_DEBUGGER 1359 if (acpi_in_debugger) { 1360 u32 chars; 1361 1362 kdb_read(buffer, sizeof(line_buf)); 1363 1364 /* remove the CR kdb includes */ 1365 chars = strlen(buffer) - 1; 1366 buffer[chars] = '\0'; 1367 } 1368#endif 1369 1370 return 0; 1371} 1372#endif /* ACPI_FUTURE_USAGE */ 1373 1374acpi_status acpi_os_signal(u32 function, void *info) 1375{ 1376 switch (function) { 1377 case ACPI_SIGNAL_FATAL: 1378 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1379 break; 1380 case ACPI_SIGNAL_BREAKPOINT: 1381 /* 1382 * AML Breakpoint 1383 * ACPI spec. says to treat it as a NOP unless 1384 * you are debugging. So if/when we integrate 1385 * AML debugger into the kernel debugger its 1386 * hook will go here. But until then it is 1387 * not useful to print anything on breakpoints. 1388 */ 1389 break; 1390 default: 1391 break; 1392 } 1393 1394 return AE_OK; 1395} 1396 1397static int __init acpi_os_name_setup(char *str) 1398{ 1399 char *p = acpi_os_name; 1400 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1401 1402 if (!str || !*str) 1403 return 0; 1404 1405 for (; count-- && *str; str++) { 1406 if (isalnum(*str) || *str == ' ' || *str == ':') 1407 *p++ = *str; 1408 else if (*str == '\'' || *str == '"') 1409 continue; 1410 else 1411 break; 1412 } 1413 *p = 0; 1414 1415 return 1; 1416 1417} 1418 1419__setup("acpi_os_name=", acpi_os_name_setup); 1420 1421#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1422#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1423 1424struct osi_setup_entry { 1425 char string[OSI_STRING_LENGTH_MAX]; 1426 bool enable; 1427}; 1428 1429static struct osi_setup_entry 1430 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1431 {"Module Device", true}, 1432 {"Processor Device", true}, 1433 {"3.0 _SCP Extensions", true}, 1434 {"Processor Aggregator Device", true}, 1435}; 1436 1437void __init acpi_osi_setup(char *str) 1438{ 1439 struct osi_setup_entry *osi; 1440 bool enable = true; 1441 int i; 1442 1443 if (!acpi_gbl_create_osi_method) 1444 return; 1445 1446 if (str == NULL || *str == '\0') { 1447 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1448 acpi_gbl_create_osi_method = FALSE; 1449 return; 1450 } 1451 1452 if (*str == '!') { 1453 str++; 1454 if (*str == '\0') { 1455 /* Do not override acpi_osi=!* */ 1456 if (!osi_linux.default_disabling) 1457 osi_linux.default_disabling = 1458 ACPI_DISABLE_ALL_VENDOR_STRINGS; 1459 return; 1460 } else if (*str == '*') { 1461 osi_linux.default_disabling = ACPI_DISABLE_ALL_STRINGS; 1462 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1463 osi = &osi_setup_entries[i]; 1464 osi->enable = false; 1465 } 1466 return; 1467 } 1468 enable = false; 1469 } 1470 1471 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1472 osi = &osi_setup_entries[i]; 1473 if (!strcmp(osi->string, str)) { 1474 osi->enable = enable; 1475 break; 1476 } else if (osi->string[0] == '\0') { 1477 osi->enable = enable; 1478 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1479 break; 1480 } 1481 } 1482} 1483 1484static void __init set_osi_linux(unsigned int enable) 1485{ 1486 if (osi_linux.enable != enable) 1487 osi_linux.enable = enable; 1488 1489 if (osi_linux.enable) 1490 acpi_osi_setup("Linux"); 1491 else 1492 acpi_osi_setup("!Linux"); 1493 1494 return; 1495} 1496 1497static void __init acpi_cmdline_osi_linux(unsigned int enable) 1498{ 1499 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1500 osi_linux.dmi = 0; 1501 set_osi_linux(enable); 1502 1503 return; 1504} 1505 1506void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1507{ 1508 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1509 1510 if (enable == -1) 1511 return; 1512 1513 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1514 set_osi_linux(enable); 1515 1516 return; 1517} 1518 1519/* 1520 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1521 * 1522 * empty string disables _OSI 1523 * string starting with '!' disables that string 1524 * otherwise string is added to list, augmenting built-in strings 1525 */ 1526static void __init acpi_osi_setup_late(void) 1527{ 1528 struct osi_setup_entry *osi; 1529 char *str; 1530 int i; 1531 acpi_status status; 1532 1533 if (osi_linux.default_disabling) { 1534 status = acpi_update_interfaces(osi_linux.default_disabling); 1535 1536 if (ACPI_SUCCESS(status)) 1537 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors%s\n", 1538 osi_linux.default_disabling == 1539 ACPI_DISABLE_ALL_STRINGS ? 1540 " and feature groups" : ""); 1541 } 1542 1543 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1544 osi = &osi_setup_entries[i]; 1545 str = osi->string; 1546 1547 if (*str == '\0') 1548 break; 1549 if (osi->enable) { 1550 status = acpi_install_interface(str); 1551 1552 if (ACPI_SUCCESS(status)) 1553 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1554 } else { 1555 status = acpi_remove_interface(str); 1556 1557 if (ACPI_SUCCESS(status)) 1558 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1559 } 1560 } 1561} 1562 1563static int __init osi_setup(char *str) 1564{ 1565 if (str && !strcmp("Linux", str)) 1566 acpi_cmdline_osi_linux(1); 1567 else if (str && !strcmp("!Linux", str)) 1568 acpi_cmdline_osi_linux(0); 1569 else 1570 acpi_osi_setup(str); 1571 1572 return 1; 1573} 1574 1575__setup("acpi_osi=", osi_setup); 1576 1577/* 1578 * Disable the auto-serialization of named objects creation methods. 1579 * 1580 * This feature is enabled by default. It marks the AML control methods 1581 * that contain the opcodes to create named objects as "Serialized". 1582 */ 1583static int __init acpi_no_auto_serialize_setup(char *str) 1584{ 1585 acpi_gbl_auto_serialize_methods = FALSE; 1586 pr_info("ACPI: auto-serialization disabled\n"); 1587 1588 return 1; 1589} 1590 1591__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1592 1593/* Check of resource interference between native drivers and ACPI 1594 * OperationRegions (SystemIO and System Memory only). 1595 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1596 * in arbitrary AML code and can interfere with legacy drivers. 1597 * acpi_enforce_resources= can be set to: 1598 * 1599 * - strict (default) (2) 1600 * -> further driver trying to access the resources will not load 1601 * - lax (1) 1602 * -> further driver trying to access the resources will load, but you 1603 * get a system message that something might go wrong... 1604 * 1605 * - no (0) 1606 * -> ACPI Operation Region resources will not be registered 1607 * 1608 */ 1609#define ENFORCE_RESOURCES_STRICT 2 1610#define ENFORCE_RESOURCES_LAX 1 1611#define ENFORCE_RESOURCES_NO 0 1612 1613static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1614 1615static int __init acpi_enforce_resources_setup(char *str) 1616{ 1617 if (str == NULL || *str == '\0') 1618 return 0; 1619 1620 if (!strcmp("strict", str)) 1621 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1622 else if (!strcmp("lax", str)) 1623 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1624 else if (!strcmp("no", str)) 1625 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1626 1627 return 1; 1628} 1629 1630__setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1631 1632/* Check for resource conflicts between ACPI OperationRegions and native 1633 * drivers */ 1634int acpi_check_resource_conflict(const struct resource *res) 1635{ 1636 acpi_adr_space_type space_id; 1637 acpi_size length; 1638 u8 warn = 0; 1639 int clash = 0; 1640 1641 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1642 return 0; 1643 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1644 return 0; 1645 1646 if (res->flags & IORESOURCE_IO) 1647 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1648 else 1649 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1650 1651 length = resource_size(res); 1652 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1653 warn = 1; 1654 clash = acpi_check_address_range(space_id, res->start, length, warn); 1655 1656 if (clash) { 1657 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1658 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1659 printk(KERN_NOTICE "ACPI: This conflict may" 1660 " cause random problems and system" 1661 " instability\n"); 1662 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1663 " for this device, you should use it instead of" 1664 " the native driver\n"); 1665 } 1666 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1667 return -EBUSY; 1668 } 1669 return 0; 1670} 1671EXPORT_SYMBOL(acpi_check_resource_conflict); 1672 1673int acpi_check_region(resource_size_t start, resource_size_t n, 1674 const char *name) 1675{ 1676 struct resource res = { 1677 .start = start, 1678 .end = start + n - 1, 1679 .name = name, 1680 .flags = IORESOURCE_IO, 1681 }; 1682 1683 return acpi_check_resource_conflict(&res); 1684} 1685EXPORT_SYMBOL(acpi_check_region); 1686 1687/* 1688 * Let drivers know whether the resource checks are effective 1689 */ 1690int acpi_resources_are_enforced(void) 1691{ 1692 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1693} 1694EXPORT_SYMBOL(acpi_resources_are_enforced); 1695 1696/* 1697 * Deallocate the memory for a spinlock. 1698 */ 1699void acpi_os_delete_lock(acpi_spinlock handle) 1700{ 1701 ACPI_FREE(handle); 1702} 1703 1704/* 1705 * Acquire a spinlock. 1706 * 1707 * handle is a pointer to the spinlock_t. 1708 */ 1709 1710acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1711{ 1712 acpi_cpu_flags flags; 1713 spin_lock_irqsave(lockp, flags); 1714 return flags; 1715} 1716 1717/* 1718 * Release a spinlock. See above. 1719 */ 1720 1721void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1722{ 1723 spin_unlock_irqrestore(lockp, flags); 1724} 1725 1726#ifndef ACPI_USE_LOCAL_CACHE 1727 1728/******************************************************************************* 1729 * 1730 * FUNCTION: acpi_os_create_cache 1731 * 1732 * PARAMETERS: name - Ascii name for the cache 1733 * size - Size of each cached object 1734 * depth - Maximum depth of the cache (in objects) <ignored> 1735 * cache - Where the new cache object is returned 1736 * 1737 * RETURN: status 1738 * 1739 * DESCRIPTION: Create a cache object 1740 * 1741 ******************************************************************************/ 1742 1743acpi_status 1744acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1745{ 1746 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1747 if (*cache == NULL) 1748 return AE_ERROR; 1749 else 1750 return AE_OK; 1751} 1752 1753/******************************************************************************* 1754 * 1755 * FUNCTION: acpi_os_purge_cache 1756 * 1757 * PARAMETERS: Cache - Handle to cache object 1758 * 1759 * RETURN: Status 1760 * 1761 * DESCRIPTION: Free all objects within the requested cache. 1762 * 1763 ******************************************************************************/ 1764 1765acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1766{ 1767 kmem_cache_shrink(cache); 1768 return (AE_OK); 1769} 1770 1771/******************************************************************************* 1772 * 1773 * FUNCTION: acpi_os_delete_cache 1774 * 1775 * PARAMETERS: Cache - Handle to cache object 1776 * 1777 * RETURN: Status 1778 * 1779 * DESCRIPTION: Free all objects within the requested cache and delete the 1780 * cache object. 1781 * 1782 ******************************************************************************/ 1783 1784acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1785{ 1786 kmem_cache_destroy(cache); 1787 return (AE_OK); 1788} 1789 1790/******************************************************************************* 1791 * 1792 * FUNCTION: acpi_os_release_object 1793 * 1794 * PARAMETERS: Cache - Handle to cache object 1795 * Object - The object to be released 1796 * 1797 * RETURN: None 1798 * 1799 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1800 * the object is deleted. 1801 * 1802 ******************************************************************************/ 1803 1804acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1805{ 1806 kmem_cache_free(cache, object); 1807 return (AE_OK); 1808} 1809#endif 1810 1811static int __init acpi_no_static_ssdt_setup(char *s) 1812{ 1813 acpi_gbl_disable_ssdt_table_install = TRUE; 1814 pr_info("ACPI: static SSDT installation disabled\n"); 1815 1816 return 0; 1817} 1818 1819early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1820 1821static int __init acpi_disable_return_repair(char *s) 1822{ 1823 printk(KERN_NOTICE PREFIX 1824 "ACPI: Predefined validation mechanism disabled\n"); 1825 acpi_gbl_disable_auto_repair = TRUE; 1826 1827 return 1; 1828} 1829 1830__setup("acpica_no_return_repair", acpi_disable_return_repair); 1831 1832acpi_status __init acpi_os_initialize(void) 1833{ 1834 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1835 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1836 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1837 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1838 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1839 /* 1840 * Use acpi_os_map_generic_address to pre-map the reset 1841 * register if it's in system memory. 1842 */ 1843 int rv; 1844 1845 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1846 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1847 } 1848 1849 return AE_OK; 1850} 1851 1852acpi_status __init acpi_os_initialize1(void) 1853{ 1854 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1855 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1856 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1857 BUG_ON(!kacpid_wq); 1858 BUG_ON(!kacpi_notify_wq); 1859 BUG_ON(!kacpi_hotplug_wq); 1860 acpi_install_interface_handler(acpi_osi_handler); 1861 acpi_osi_setup_late(); 1862 return AE_OK; 1863} 1864 1865acpi_status acpi_os_terminate(void) 1866{ 1867 if (acpi_irq_handler) { 1868 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1869 acpi_irq_handler); 1870 } 1871 1872 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1873 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1874 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1875 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1876 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1877 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1878 1879 destroy_workqueue(kacpid_wq); 1880 destroy_workqueue(kacpi_notify_wq); 1881 destroy_workqueue(kacpi_hotplug_wq); 1882 1883 return AE_OK; 1884} 1885 1886acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1887 u32 pm1b_control) 1888{ 1889 int rc = 0; 1890 if (__acpi_os_prepare_sleep) 1891 rc = __acpi_os_prepare_sleep(sleep_state, 1892 pm1a_control, pm1b_control); 1893 if (rc < 0) 1894 return AE_ERROR; 1895 else if (rc > 0) 1896 return AE_CTRL_SKIP; 1897 1898 return AE_OK; 1899} 1900 1901void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1902 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1903{ 1904 __acpi_os_prepare_sleep = func; 1905} 1906 1907acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1908 u32 val_b) 1909{ 1910 int rc = 0; 1911 if (__acpi_os_prepare_extended_sleep) 1912 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1913 val_a, val_b); 1914 if (rc < 0) 1915 return AE_ERROR; 1916 else if (rc > 0) 1917 return AE_CTRL_SKIP; 1918 1919 return AE_OK; 1920} 1921 1922void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1923 u32 val_a, u32 val_b)) 1924{ 1925 __acpi_os_prepare_extended_sleep = func; 1926} 1927