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/acpi_io.h> 43 #include <linux/efi.h> 44 #include <linux/ioport.h> 45 #include <linux/list.h> 46 #include <linux/jiffies.h> 47 #include <linux/semaphore.h> 48 49 #include <asm/io.h> 50 #include <asm/uaccess.h> 51 52 #include <acpi/acpi.h> 53 #include <acpi/acpi_bus.h> 54 #include <acpi/processor.h> 55 #include "internal.h" 56 57 #define _COMPONENT ACPI_OS_SERVICES 58 ACPI_MODULE_NAME("osl"); 59 #define PREFIX "ACPI: " 60 struct acpi_os_dpc { 61 acpi_osd_exec_callback function; 62 void *context; 63 struct work_struct work; 64 }; 65 66 #ifdef CONFIG_ACPI_CUSTOM_DSDT 67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 68 #endif 69 70 #ifdef ENABLE_DEBUGGER 71 #include <linux/kdb.h> 72 73 /* stuff for debugger support */ 74 int acpi_in_debugger; 75 EXPORT_SYMBOL(acpi_in_debugger); 76 77 extern char line_buf[80]; 78 #endif /*ENABLE_DEBUGGER */ 79 80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl, 81 u32 pm1b_ctrl); 82 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a, 83 u32 val_b); 84 85 static acpi_osd_handler acpi_irq_handler; 86 static void *acpi_irq_context; 87 static struct workqueue_struct *kacpid_wq; 88 static struct workqueue_struct *kacpi_notify_wq; 89 static struct workqueue_struct *kacpi_hotplug_wq; 90 91 /* 92 * This list of permanent mappings is for memory that may be accessed from 93 * interrupt context, where we can't do the ioremap(). 94 */ 95 struct acpi_ioremap { 96 struct list_head list; 97 void __iomem *virt; 98 acpi_physical_address phys; 99 acpi_size size; 100 unsigned long refcount; 101 }; 102 103 static LIST_HEAD(acpi_ioremaps); 104 static DEFINE_MUTEX(acpi_ioremap_lock); 105 106 static void __init acpi_osi_setup_late(void); 107 108 /* 109 * The story of _OSI(Linux) 110 * 111 * From pre-history through Linux-2.6.22, 112 * Linux responded TRUE upon a BIOS OSI(Linux) query. 113 * 114 * Unfortunately, reference BIOS writers got wind of this 115 * and put OSI(Linux) in their example code, quickly exposing 116 * this string as ill-conceived and opening the door to 117 * an un-bounded number of BIOS incompatibilities. 118 * 119 * For example, OSI(Linux) was used on resume to re-POST a 120 * video card on one system, because Linux at that time 121 * could not do a speedy restore in its native driver. 122 * But then upon gaining quick native restore capability, 123 * Linux has no way to tell the BIOS to skip the time-consuming 124 * POST -- putting Linux at a permanent performance disadvantage. 125 * On another system, the BIOS writer used OSI(Linux) 126 * to infer native OS support for IPMI! On other systems, 127 * OSI(Linux) simply got in the way of Linux claiming to 128 * be compatible with other operating systems, exposing 129 * BIOS issues such as skipped device initialization. 130 * 131 * So "Linux" turned out to be a really poor chose of 132 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 133 * 134 * BIOS writers should NOT query _OSI(Linux) on future systems. 135 * Linux will complain on the console when it sees it, and return FALSE. 136 * To get Linux to return TRUE for your system will require 137 * a kernel source update to add a DMI entry, 138 * or boot with "acpi_osi=Linux" 139 */ 140 141 static struct osi_linux { 142 unsigned int enable:1; 143 unsigned int dmi:1; 144 unsigned int cmdline:1; 145 unsigned int default_disabling:1; 146 } osi_linux = {0, 0, 0, 0}; 147 148 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 149 { 150 if (!strcmp("Linux", interface)) { 151 152 printk_once(KERN_NOTICE FW_BUG PREFIX 153 "BIOS _OSI(Linux) query %s%s\n", 154 osi_linux.enable ? "honored" : "ignored", 155 osi_linux.cmdline ? " via cmdline" : 156 osi_linux.dmi ? " via DMI" : ""); 157 } 158 159 return supported; 160 } 161 162 static void __init acpi_request_region (struct acpi_generic_address *gas, 163 unsigned int length, char *desc) 164 { 165 u64 addr; 166 167 /* Handle possible alignment issues */ 168 memcpy(&addr, &gas->address, sizeof(addr)); 169 if (!addr || !length) 170 return; 171 172 /* Resources are never freed */ 173 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 174 request_region(addr, length, desc); 175 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 176 request_mem_region(addr, length, desc); 177 } 178 179 static int __init acpi_reserve_resources(void) 180 { 181 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 182 "ACPI PM1a_EVT_BLK"); 183 184 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 185 "ACPI PM1b_EVT_BLK"); 186 187 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 188 "ACPI PM1a_CNT_BLK"); 189 190 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 191 "ACPI PM1b_CNT_BLK"); 192 193 if (acpi_gbl_FADT.pm_timer_length == 4) 194 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 195 196 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 197 "ACPI PM2_CNT_BLK"); 198 199 /* Length of GPE blocks must be a non-negative multiple of 2 */ 200 201 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 202 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 203 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 204 205 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 206 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 207 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 208 209 return 0; 210 } 211 device_initcall(acpi_reserve_resources); 212 213 void acpi_os_printf(const char *fmt, ...) 214 { 215 va_list args; 216 va_start(args, fmt); 217 acpi_os_vprintf(fmt, args); 218 va_end(args); 219 } 220 221 void acpi_os_vprintf(const char *fmt, va_list args) 222 { 223 static char buffer[512]; 224 225 vsprintf(buffer, fmt, args); 226 227 #ifdef ENABLE_DEBUGGER 228 if (acpi_in_debugger) { 229 kdb_printf("%s", buffer); 230 } else { 231 printk(KERN_CONT "%s", buffer); 232 } 233 #else 234 printk(KERN_CONT "%s", buffer); 235 #endif 236 } 237 238 #ifdef CONFIG_KEXEC 239 static unsigned long acpi_rsdp; 240 static int __init setup_acpi_rsdp(char *arg) 241 { 242 acpi_rsdp = simple_strtoul(arg, NULL, 16); 243 return 0; 244 } 245 early_param("acpi_rsdp", setup_acpi_rsdp); 246 #endif 247 248 acpi_physical_address __init acpi_os_get_root_pointer(void) 249 { 250 #ifdef CONFIG_KEXEC 251 if (acpi_rsdp) 252 return acpi_rsdp; 253 #endif 254 255 if (efi_enabled(EFI_CONFIG_TABLES)) { 256 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 257 return efi.acpi20; 258 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 259 return efi.acpi; 260 else { 261 printk(KERN_ERR PREFIX 262 "System description tables not found\n"); 263 return 0; 264 } 265 } else { 266 acpi_physical_address pa = 0; 267 268 acpi_find_root_pointer(&pa); 269 return pa; 270 } 271 } 272 273 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 274 static struct acpi_ioremap * 275 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 276 { 277 struct acpi_ioremap *map; 278 279 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 280 if (map->phys <= phys && 281 phys + size <= map->phys + map->size) 282 return map; 283 284 return NULL; 285 } 286 287 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 288 static void __iomem * 289 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 290 { 291 struct acpi_ioremap *map; 292 293 map = acpi_map_lookup(phys, size); 294 if (map) 295 return map->virt + (phys - map->phys); 296 297 return NULL; 298 } 299 300 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 301 { 302 struct acpi_ioremap *map; 303 void __iomem *virt = NULL; 304 305 mutex_lock(&acpi_ioremap_lock); 306 map = acpi_map_lookup(phys, size); 307 if (map) { 308 virt = map->virt + (phys - map->phys); 309 map->refcount++; 310 } 311 mutex_unlock(&acpi_ioremap_lock); 312 return virt; 313 } 314 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 315 316 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 317 static struct acpi_ioremap * 318 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 319 { 320 struct acpi_ioremap *map; 321 322 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 323 if (map->virt <= virt && 324 virt + size <= map->virt + map->size) 325 return map; 326 327 return NULL; 328 } 329 330 #ifndef CONFIG_IA64 331 #define should_use_kmap(pfn) page_is_ram(pfn) 332 #else 333 /* ioremap will take care of cache attributes */ 334 #define should_use_kmap(pfn) 0 335 #endif 336 337 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 338 { 339 unsigned long pfn; 340 341 pfn = pg_off >> PAGE_SHIFT; 342 if (should_use_kmap(pfn)) { 343 if (pg_sz > PAGE_SIZE) 344 return NULL; 345 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 346 } else 347 return acpi_os_ioremap(pg_off, pg_sz); 348 } 349 350 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 351 { 352 unsigned long pfn; 353 354 pfn = pg_off >> PAGE_SHIFT; 355 if (should_use_kmap(pfn)) 356 kunmap(pfn_to_page(pfn)); 357 else 358 iounmap(vaddr); 359 } 360 361 void __iomem *__init_refok 362 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 363 { 364 struct acpi_ioremap *map; 365 void __iomem *virt; 366 acpi_physical_address pg_off; 367 acpi_size pg_sz; 368 369 if (phys > ULONG_MAX) { 370 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 371 return NULL; 372 } 373 374 if (!acpi_gbl_permanent_mmap) 375 return __acpi_map_table((unsigned long)phys, size); 376 377 mutex_lock(&acpi_ioremap_lock); 378 /* Check if there's a suitable mapping already. */ 379 map = acpi_map_lookup(phys, size); 380 if (map) { 381 map->refcount++; 382 goto out; 383 } 384 385 map = kzalloc(sizeof(*map), GFP_KERNEL); 386 if (!map) { 387 mutex_unlock(&acpi_ioremap_lock); 388 return NULL; 389 } 390 391 pg_off = round_down(phys, PAGE_SIZE); 392 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 393 virt = acpi_map(pg_off, pg_sz); 394 if (!virt) { 395 mutex_unlock(&acpi_ioremap_lock); 396 kfree(map); 397 return NULL; 398 } 399 400 INIT_LIST_HEAD(&map->list); 401 map->virt = virt; 402 map->phys = pg_off; 403 map->size = pg_sz; 404 map->refcount = 1; 405 406 list_add_tail_rcu(&map->list, &acpi_ioremaps); 407 408 out: 409 mutex_unlock(&acpi_ioremap_lock); 410 return map->virt + (phys - map->phys); 411 } 412 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 413 414 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 415 { 416 if (!--map->refcount) 417 list_del_rcu(&map->list); 418 } 419 420 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 421 { 422 if (!map->refcount) { 423 synchronize_rcu(); 424 acpi_unmap(map->phys, map->virt); 425 kfree(map); 426 } 427 } 428 429 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 430 { 431 struct acpi_ioremap *map; 432 433 if (!acpi_gbl_permanent_mmap) { 434 __acpi_unmap_table(virt, size); 435 return; 436 } 437 438 mutex_lock(&acpi_ioremap_lock); 439 map = acpi_map_lookup_virt(virt, size); 440 if (!map) { 441 mutex_unlock(&acpi_ioremap_lock); 442 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 443 return; 444 } 445 acpi_os_drop_map_ref(map); 446 mutex_unlock(&acpi_ioremap_lock); 447 448 acpi_os_map_cleanup(map); 449 } 450 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 451 452 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 453 { 454 if (!acpi_gbl_permanent_mmap) 455 __acpi_unmap_table(virt, size); 456 } 457 458 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 459 { 460 u64 addr; 461 void __iomem *virt; 462 463 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 464 return 0; 465 466 /* Handle possible alignment issues */ 467 memcpy(&addr, &gas->address, sizeof(addr)); 468 if (!addr || !gas->bit_width) 469 return -EINVAL; 470 471 virt = acpi_os_map_memory(addr, gas->bit_width / 8); 472 if (!virt) 473 return -EIO; 474 475 return 0; 476 } 477 EXPORT_SYMBOL(acpi_os_map_generic_address); 478 479 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 480 { 481 u64 addr; 482 struct acpi_ioremap *map; 483 484 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 485 return; 486 487 /* Handle possible alignment issues */ 488 memcpy(&addr, &gas->address, sizeof(addr)); 489 if (!addr || !gas->bit_width) 490 return; 491 492 mutex_lock(&acpi_ioremap_lock); 493 map = acpi_map_lookup(addr, gas->bit_width / 8); 494 if (!map) { 495 mutex_unlock(&acpi_ioremap_lock); 496 return; 497 } 498 acpi_os_drop_map_ref(map); 499 mutex_unlock(&acpi_ioremap_lock); 500 501 acpi_os_map_cleanup(map); 502 } 503 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 504 505 #ifdef ACPI_FUTURE_USAGE 506 acpi_status 507 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 508 { 509 if (!phys || !virt) 510 return AE_BAD_PARAMETER; 511 512 *phys = virt_to_phys(virt); 513 514 return AE_OK; 515 } 516 #endif 517 518 #define ACPI_MAX_OVERRIDE_LEN 100 519 520 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 521 522 acpi_status 523 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 524 acpi_string * new_val) 525 { 526 if (!init_val || !new_val) 527 return AE_BAD_PARAMETER; 528 529 *new_val = NULL; 530 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 531 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 532 acpi_os_name); 533 *new_val = acpi_os_name; 534 } 535 536 return AE_OK; 537 } 538 539 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 540 #include <linux/earlycpio.h> 541 #include <linux/memblock.h> 542 543 static u64 acpi_tables_addr; 544 static int all_tables_size; 545 546 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 547 u8 __init acpi_table_checksum(u8 *buffer, u32 length) 548 { 549 u8 sum = 0; 550 u8 *end = buffer + length; 551 552 while (buffer < end) 553 sum = (u8) (sum + *(buffer++)); 554 return sum; 555 } 556 557 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 558 static const char * const table_sigs[] = { 559 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 560 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 561 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 562 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 563 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 564 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 565 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 566 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 567 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 568 569 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 570 571 #define ACPI_OVERRIDE_TABLES 64 572 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 573 574 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 575 576 void __init acpi_initrd_override(void *data, size_t size) 577 { 578 int sig, no, table_nr = 0, total_offset = 0; 579 long offset = 0; 580 struct acpi_table_header *table; 581 char cpio_path[32] = "kernel/firmware/acpi/"; 582 struct cpio_data file; 583 584 if (data == NULL || size == 0) 585 return; 586 587 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 588 file = find_cpio_data(cpio_path, data, size, &offset); 589 if (!file.data) 590 break; 591 592 data += offset; 593 size -= offset; 594 595 if (file.size < sizeof(struct acpi_table_header)) { 596 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 597 cpio_path, file.name); 598 continue; 599 } 600 601 table = file.data; 602 603 for (sig = 0; table_sigs[sig]; sig++) 604 if (!memcmp(table->signature, table_sigs[sig], 4)) 605 break; 606 607 if (!table_sigs[sig]) { 608 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 609 cpio_path, file.name); 610 continue; 611 } 612 if (file.size != table->length) { 613 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 614 cpio_path, file.name); 615 continue; 616 } 617 if (acpi_table_checksum(file.data, table->length)) { 618 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 619 cpio_path, file.name); 620 continue; 621 } 622 623 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 624 table->signature, cpio_path, file.name, table->length); 625 626 all_tables_size += table->length; 627 acpi_initrd_files[table_nr].data = file.data; 628 acpi_initrd_files[table_nr].size = file.size; 629 table_nr++; 630 } 631 if (table_nr == 0) 632 return; 633 634 acpi_tables_addr = 635 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 636 all_tables_size, PAGE_SIZE); 637 if (!acpi_tables_addr) { 638 WARN_ON(1); 639 return; 640 } 641 /* 642 * Only calling e820_add_reserve does not work and the 643 * tables are invalid (memory got used) later. 644 * memblock_reserve works as expected and the tables won't get modified. 645 * But it's not enough on X86 because ioremap will 646 * complain later (used by acpi_os_map_memory) that the pages 647 * that should get mapped are not marked "reserved". 648 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 649 * works fine. 650 */ 651 memblock_reserve(acpi_tables_addr, all_tables_size); 652 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 653 654 /* 655 * early_ioremap only can remap 256k one time. If we map all 656 * tables one time, we will hit the limit. Need to map chunks 657 * one by one during copying the same as that in relocate_initrd(). 658 */ 659 for (no = 0; no < table_nr; no++) { 660 unsigned char *src_p = acpi_initrd_files[no].data; 661 phys_addr_t size = acpi_initrd_files[no].size; 662 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 663 phys_addr_t slop, clen; 664 char *dest_p; 665 666 total_offset += size; 667 668 while (size) { 669 slop = dest_addr & ~PAGE_MASK; 670 clen = size; 671 if (clen > MAP_CHUNK_SIZE - slop) 672 clen = MAP_CHUNK_SIZE - slop; 673 dest_p = early_ioremap(dest_addr & PAGE_MASK, 674 clen + slop); 675 memcpy(dest_p + slop, src_p, clen); 676 early_iounmap(dest_p, clen + slop); 677 src_p += clen; 678 dest_addr += clen; 679 size -= clen; 680 } 681 } 682 } 683 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 684 685 static void acpi_table_taint(struct acpi_table_header *table) 686 { 687 pr_warn(PREFIX 688 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 689 table->signature, table->oem_table_id); 690 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 691 } 692 693 694 acpi_status 695 acpi_os_table_override(struct acpi_table_header * existing_table, 696 struct acpi_table_header ** new_table) 697 { 698 if (!existing_table || !new_table) 699 return AE_BAD_PARAMETER; 700 701 *new_table = NULL; 702 703 #ifdef CONFIG_ACPI_CUSTOM_DSDT 704 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 705 *new_table = (struct acpi_table_header *)AmlCode; 706 #endif 707 if (*new_table != NULL) 708 acpi_table_taint(existing_table); 709 return AE_OK; 710 } 711 712 acpi_status 713 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 714 acpi_physical_address *address, 715 u32 *table_length) 716 { 717 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 718 *table_length = 0; 719 *address = 0; 720 return AE_OK; 721 #else 722 int table_offset = 0; 723 struct acpi_table_header *table; 724 725 *table_length = 0; 726 *address = 0; 727 728 if (!acpi_tables_addr) 729 return AE_OK; 730 731 do { 732 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 733 WARN_ON(1); 734 return AE_OK; 735 } 736 737 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 738 ACPI_HEADER_SIZE); 739 740 if (table_offset + table->length > all_tables_size) { 741 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 742 WARN_ON(1); 743 return AE_OK; 744 } 745 746 table_offset += table->length; 747 748 if (memcmp(existing_table->signature, table->signature, 4)) { 749 acpi_os_unmap_memory(table, 750 ACPI_HEADER_SIZE); 751 continue; 752 } 753 754 /* Only override tables with matching oem id */ 755 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 756 ACPI_OEM_TABLE_ID_SIZE)) { 757 acpi_os_unmap_memory(table, 758 ACPI_HEADER_SIZE); 759 continue; 760 } 761 762 table_offset -= table->length; 763 *table_length = table->length; 764 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 765 *address = acpi_tables_addr + table_offset; 766 break; 767 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 768 769 if (*address != 0) 770 acpi_table_taint(existing_table); 771 return AE_OK; 772 #endif 773 } 774 775 static irqreturn_t acpi_irq(int irq, void *dev_id) 776 { 777 u32 handled; 778 779 handled = (*acpi_irq_handler) (acpi_irq_context); 780 781 if (handled) { 782 acpi_irq_handled++; 783 return IRQ_HANDLED; 784 } else { 785 acpi_irq_not_handled++; 786 return IRQ_NONE; 787 } 788 } 789 790 acpi_status 791 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 792 void *context) 793 { 794 unsigned int irq; 795 796 acpi_irq_stats_init(); 797 798 /* 799 * ACPI interrupts different from the SCI in our copy of the FADT are 800 * not supported. 801 */ 802 if (gsi != acpi_gbl_FADT.sci_interrupt) 803 return AE_BAD_PARAMETER; 804 805 if (acpi_irq_handler) 806 return AE_ALREADY_ACQUIRED; 807 808 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 809 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 810 gsi); 811 return AE_OK; 812 } 813 814 acpi_irq_handler = handler; 815 acpi_irq_context = context; 816 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) { 817 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 818 acpi_irq_handler = NULL; 819 return AE_NOT_ACQUIRED; 820 } 821 822 return AE_OK; 823 } 824 825 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 826 { 827 if (irq != acpi_gbl_FADT.sci_interrupt) 828 return AE_BAD_PARAMETER; 829 830 free_irq(irq, acpi_irq); 831 acpi_irq_handler = NULL; 832 833 return AE_OK; 834 } 835 836 /* 837 * Running in interpreter thread context, safe to sleep 838 */ 839 840 void acpi_os_sleep(u64 ms) 841 { 842 msleep(ms); 843 } 844 845 void acpi_os_stall(u32 us) 846 { 847 while (us) { 848 u32 delay = 1000; 849 850 if (delay > us) 851 delay = us; 852 udelay(delay); 853 touch_nmi_watchdog(); 854 us -= delay; 855 } 856 } 857 858 /* 859 * Support ACPI 3.0 AML Timer operand 860 * Returns 64-bit free-running, monotonically increasing timer 861 * with 100ns granularity 862 */ 863 u64 acpi_os_get_timer(void) 864 { 865 u64 time_ns = ktime_to_ns(ktime_get()); 866 do_div(time_ns, 100); 867 return time_ns; 868 } 869 870 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 871 { 872 u32 dummy; 873 874 if (!value) 875 value = &dummy; 876 877 *value = 0; 878 if (width <= 8) { 879 *(u8 *) value = inb(port); 880 } else if (width <= 16) { 881 *(u16 *) value = inw(port); 882 } else if (width <= 32) { 883 *(u32 *) value = inl(port); 884 } else { 885 BUG(); 886 } 887 888 return AE_OK; 889 } 890 891 EXPORT_SYMBOL(acpi_os_read_port); 892 893 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 894 { 895 if (width <= 8) { 896 outb(value, port); 897 } else if (width <= 16) { 898 outw(value, port); 899 } else if (width <= 32) { 900 outl(value, port); 901 } else { 902 BUG(); 903 } 904 905 return AE_OK; 906 } 907 908 EXPORT_SYMBOL(acpi_os_write_port); 909 910 #ifdef readq 911 static inline u64 read64(const volatile void __iomem *addr) 912 { 913 return readq(addr); 914 } 915 #else 916 static inline u64 read64(const volatile void __iomem *addr) 917 { 918 u64 l, h; 919 l = readl(addr); 920 h = readl(addr+4); 921 return l | (h << 32); 922 } 923 #endif 924 925 acpi_status 926 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 927 { 928 void __iomem *virt_addr; 929 unsigned int size = width / 8; 930 bool unmap = false; 931 u64 dummy; 932 933 rcu_read_lock(); 934 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 935 if (!virt_addr) { 936 rcu_read_unlock(); 937 virt_addr = acpi_os_ioremap(phys_addr, size); 938 if (!virt_addr) 939 return AE_BAD_ADDRESS; 940 unmap = true; 941 } 942 943 if (!value) 944 value = &dummy; 945 946 switch (width) { 947 case 8: 948 *(u8 *) value = readb(virt_addr); 949 break; 950 case 16: 951 *(u16 *) value = readw(virt_addr); 952 break; 953 case 32: 954 *(u32 *) value = readl(virt_addr); 955 break; 956 case 64: 957 *(u64 *) value = read64(virt_addr); 958 break; 959 default: 960 BUG(); 961 } 962 963 if (unmap) 964 iounmap(virt_addr); 965 else 966 rcu_read_unlock(); 967 968 return AE_OK; 969 } 970 971 #ifdef writeq 972 static inline void write64(u64 val, volatile void __iomem *addr) 973 { 974 writeq(val, addr); 975 } 976 #else 977 static inline void write64(u64 val, volatile void __iomem *addr) 978 { 979 writel(val, addr); 980 writel(val>>32, addr+4); 981 } 982 #endif 983 984 acpi_status 985 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 986 { 987 void __iomem *virt_addr; 988 unsigned int size = width / 8; 989 bool unmap = false; 990 991 rcu_read_lock(); 992 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 993 if (!virt_addr) { 994 rcu_read_unlock(); 995 virt_addr = acpi_os_ioremap(phys_addr, size); 996 if (!virt_addr) 997 return AE_BAD_ADDRESS; 998 unmap = true; 999 } 1000 1001 switch (width) { 1002 case 8: 1003 writeb(value, virt_addr); 1004 break; 1005 case 16: 1006 writew(value, virt_addr); 1007 break; 1008 case 32: 1009 writel(value, virt_addr); 1010 break; 1011 case 64: 1012 write64(value, virt_addr); 1013 break; 1014 default: 1015 BUG(); 1016 } 1017 1018 if (unmap) 1019 iounmap(virt_addr); 1020 else 1021 rcu_read_unlock(); 1022 1023 return AE_OK; 1024 } 1025 1026 acpi_status 1027 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1028 u64 *value, u32 width) 1029 { 1030 int result, size; 1031 u32 value32; 1032 1033 if (!value) 1034 return AE_BAD_PARAMETER; 1035 1036 switch (width) { 1037 case 8: 1038 size = 1; 1039 break; 1040 case 16: 1041 size = 2; 1042 break; 1043 case 32: 1044 size = 4; 1045 break; 1046 default: 1047 return AE_ERROR; 1048 } 1049 1050 result = raw_pci_read(pci_id->segment, pci_id->bus, 1051 PCI_DEVFN(pci_id->device, pci_id->function), 1052 reg, size, &value32); 1053 *value = value32; 1054 1055 return (result ? AE_ERROR : AE_OK); 1056 } 1057 1058 acpi_status 1059 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1060 u64 value, u32 width) 1061 { 1062 int result, size; 1063 1064 switch (width) { 1065 case 8: 1066 size = 1; 1067 break; 1068 case 16: 1069 size = 2; 1070 break; 1071 case 32: 1072 size = 4; 1073 break; 1074 default: 1075 return AE_ERROR; 1076 } 1077 1078 result = raw_pci_write(pci_id->segment, pci_id->bus, 1079 PCI_DEVFN(pci_id->device, pci_id->function), 1080 reg, size, value); 1081 1082 return (result ? AE_ERROR : AE_OK); 1083 } 1084 1085 static void acpi_os_execute_deferred(struct work_struct *work) 1086 { 1087 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1088 1089 dpc->function(dpc->context); 1090 kfree(dpc); 1091 } 1092 1093 /******************************************************************************* 1094 * 1095 * FUNCTION: acpi_os_execute 1096 * 1097 * PARAMETERS: Type - Type of the callback 1098 * Function - Function to be executed 1099 * Context - Function parameters 1100 * 1101 * RETURN: Status 1102 * 1103 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1104 * immediately executes function on a separate thread. 1105 * 1106 ******************************************************************************/ 1107 1108 acpi_status acpi_os_execute(acpi_execute_type type, 1109 acpi_osd_exec_callback function, void *context) 1110 { 1111 acpi_status status = AE_OK; 1112 struct acpi_os_dpc *dpc; 1113 struct workqueue_struct *queue; 1114 int ret; 1115 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1116 "Scheduling function [%p(%p)] for deferred execution.\n", 1117 function, context)); 1118 1119 /* 1120 * Allocate/initialize DPC structure. Note that this memory will be 1121 * freed by the callee. The kernel handles the work_struct list in a 1122 * way that allows us to also free its memory inside the callee. 1123 * Because we may want to schedule several tasks with different 1124 * parameters we can't use the approach some kernel code uses of 1125 * having a static work_struct. 1126 */ 1127 1128 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1129 if (!dpc) 1130 return AE_NO_MEMORY; 1131 1132 dpc->function = function; 1133 dpc->context = context; 1134 1135 /* 1136 * To prevent lockdep from complaining unnecessarily, make sure that 1137 * there is a different static lockdep key for each workqueue by using 1138 * INIT_WORK() for each of them separately. 1139 */ 1140 if (type == OSL_NOTIFY_HANDLER) { 1141 queue = kacpi_notify_wq; 1142 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1143 } else { 1144 queue = kacpid_wq; 1145 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1146 } 1147 1148 /* 1149 * On some machines, a software-initiated SMI causes corruption unless 1150 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1151 * typically it's done in GPE-related methods that are run via 1152 * workqueues, so we can avoid the known corruption cases by always 1153 * queueing on CPU 0. 1154 */ 1155 ret = queue_work_on(0, queue, &dpc->work); 1156 1157 if (!ret) { 1158 printk(KERN_ERR PREFIX 1159 "Call to queue_work() failed.\n"); 1160 status = AE_ERROR; 1161 kfree(dpc); 1162 } 1163 return status; 1164 } 1165 EXPORT_SYMBOL(acpi_os_execute); 1166 1167 void acpi_os_wait_events_complete(void) 1168 { 1169 flush_workqueue(kacpid_wq); 1170 flush_workqueue(kacpi_notify_wq); 1171 } 1172 1173 struct acpi_hp_work { 1174 struct work_struct work; 1175 acpi_hp_callback func; 1176 void *data; 1177 u32 src; 1178 }; 1179 1180 static void acpi_hotplug_work_fn(struct work_struct *work) 1181 { 1182 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1183 1184 acpi_os_wait_events_complete(); 1185 hpw->func(hpw->data, hpw->src); 1186 kfree(hpw); 1187 } 1188 1189 acpi_status acpi_hotplug_execute(acpi_hp_callback func, void *data, u32 src) 1190 { 1191 struct acpi_hp_work *hpw; 1192 1193 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1194 "Scheduling function [%p(%p, %u)] for deferred execution.\n", 1195 func, data, src)); 1196 1197 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1198 if (!hpw) 1199 return AE_NO_MEMORY; 1200 1201 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1202 hpw->func = func; 1203 hpw->data = data; 1204 hpw->src = src; 1205 /* 1206 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1207 * the hotplug code may call driver .remove() functions, which may 1208 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1209 * these workqueues. 1210 */ 1211 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1212 kfree(hpw); 1213 return AE_ERROR; 1214 } 1215 return AE_OK; 1216 } 1217 1218 1219 acpi_status 1220 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1221 { 1222 struct semaphore *sem = NULL; 1223 1224 sem = acpi_os_allocate(sizeof(struct semaphore)); 1225 if (!sem) 1226 return AE_NO_MEMORY; 1227 memset(sem, 0, sizeof(struct semaphore)); 1228 1229 sema_init(sem, initial_units); 1230 1231 *handle = (acpi_handle *) sem; 1232 1233 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1234 *handle, initial_units)); 1235 1236 return AE_OK; 1237 } 1238 1239 /* 1240 * TODO: A better way to delete semaphores? Linux doesn't have a 1241 * 'delete_semaphore()' function -- may result in an invalid 1242 * pointer dereference for non-synchronized consumers. Should 1243 * we at least check for blocked threads and signal/cancel them? 1244 */ 1245 1246 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1247 { 1248 struct semaphore *sem = (struct semaphore *)handle; 1249 1250 if (!sem) 1251 return AE_BAD_PARAMETER; 1252 1253 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1254 1255 BUG_ON(!list_empty(&sem->wait_list)); 1256 kfree(sem); 1257 sem = NULL; 1258 1259 return AE_OK; 1260 } 1261 1262 /* 1263 * TODO: Support for units > 1? 1264 */ 1265 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1266 { 1267 acpi_status status = AE_OK; 1268 struct semaphore *sem = (struct semaphore *)handle; 1269 long jiffies; 1270 int ret = 0; 1271 1272 if (!sem || (units < 1)) 1273 return AE_BAD_PARAMETER; 1274 1275 if (units > 1) 1276 return AE_SUPPORT; 1277 1278 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1279 handle, units, timeout)); 1280 1281 if (timeout == ACPI_WAIT_FOREVER) 1282 jiffies = MAX_SCHEDULE_TIMEOUT; 1283 else 1284 jiffies = msecs_to_jiffies(timeout); 1285 1286 ret = down_timeout(sem, jiffies); 1287 if (ret) 1288 status = AE_TIME; 1289 1290 if (ACPI_FAILURE(status)) { 1291 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1292 "Failed to acquire semaphore[%p|%d|%d], %s", 1293 handle, units, timeout, 1294 acpi_format_exception(status))); 1295 } else { 1296 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1297 "Acquired semaphore[%p|%d|%d]", handle, 1298 units, timeout)); 1299 } 1300 1301 return status; 1302 } 1303 1304 /* 1305 * TODO: Support for units > 1? 1306 */ 1307 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1308 { 1309 struct semaphore *sem = (struct semaphore *)handle; 1310 1311 if (!sem || (units < 1)) 1312 return AE_BAD_PARAMETER; 1313 1314 if (units > 1) 1315 return AE_SUPPORT; 1316 1317 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1318 units)); 1319 1320 up(sem); 1321 1322 return AE_OK; 1323 } 1324 1325 #ifdef ACPI_FUTURE_USAGE 1326 u32 acpi_os_get_line(char *buffer) 1327 { 1328 1329 #ifdef ENABLE_DEBUGGER 1330 if (acpi_in_debugger) { 1331 u32 chars; 1332 1333 kdb_read(buffer, sizeof(line_buf)); 1334 1335 /* remove the CR kdb includes */ 1336 chars = strlen(buffer) - 1; 1337 buffer[chars] = '\0'; 1338 } 1339 #endif 1340 1341 return 0; 1342 } 1343 #endif /* ACPI_FUTURE_USAGE */ 1344 1345 acpi_status acpi_os_signal(u32 function, void *info) 1346 { 1347 switch (function) { 1348 case ACPI_SIGNAL_FATAL: 1349 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1350 break; 1351 case ACPI_SIGNAL_BREAKPOINT: 1352 /* 1353 * AML Breakpoint 1354 * ACPI spec. says to treat it as a NOP unless 1355 * you are debugging. So if/when we integrate 1356 * AML debugger into the kernel debugger its 1357 * hook will go here. But until then it is 1358 * not useful to print anything on breakpoints. 1359 */ 1360 break; 1361 default: 1362 break; 1363 } 1364 1365 return AE_OK; 1366 } 1367 1368 static int __init acpi_os_name_setup(char *str) 1369 { 1370 char *p = acpi_os_name; 1371 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1372 1373 if (!str || !*str) 1374 return 0; 1375 1376 for (; count-- && *str; str++) { 1377 if (isalnum(*str) || *str == ' ' || *str == ':') 1378 *p++ = *str; 1379 else if (*str == '\'' || *str == '"') 1380 continue; 1381 else 1382 break; 1383 } 1384 *p = 0; 1385 1386 return 1; 1387 1388 } 1389 1390 __setup("acpi_os_name=", acpi_os_name_setup); 1391 1392 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1393 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1394 1395 struct osi_setup_entry { 1396 char string[OSI_STRING_LENGTH_MAX]; 1397 bool enable; 1398 }; 1399 1400 static struct osi_setup_entry 1401 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1402 {"Module Device", true}, 1403 {"Processor Device", true}, 1404 {"3.0 _SCP Extensions", true}, 1405 {"Processor Aggregator Device", true}, 1406 }; 1407 1408 void __init acpi_osi_setup(char *str) 1409 { 1410 struct osi_setup_entry *osi; 1411 bool enable = true; 1412 int i; 1413 1414 if (!acpi_gbl_create_osi_method) 1415 return; 1416 1417 if (str == NULL || *str == '\0') { 1418 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1419 acpi_gbl_create_osi_method = FALSE; 1420 return; 1421 } 1422 1423 if (*str == '!') { 1424 str++; 1425 if (*str == '\0') { 1426 osi_linux.default_disabling = 1; 1427 return; 1428 } else if (*str == '*') { 1429 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1430 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1431 osi = &osi_setup_entries[i]; 1432 osi->enable = false; 1433 } 1434 return; 1435 } 1436 enable = false; 1437 } 1438 1439 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1440 osi = &osi_setup_entries[i]; 1441 if (!strcmp(osi->string, str)) { 1442 osi->enable = enable; 1443 break; 1444 } else if (osi->string[0] == '\0') { 1445 osi->enable = enable; 1446 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1447 break; 1448 } 1449 } 1450 } 1451 1452 static void __init set_osi_linux(unsigned int enable) 1453 { 1454 if (osi_linux.enable != enable) 1455 osi_linux.enable = enable; 1456 1457 if (osi_linux.enable) 1458 acpi_osi_setup("Linux"); 1459 else 1460 acpi_osi_setup("!Linux"); 1461 1462 return; 1463 } 1464 1465 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1466 { 1467 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1468 osi_linux.dmi = 0; 1469 set_osi_linux(enable); 1470 1471 return; 1472 } 1473 1474 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1475 { 1476 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1477 1478 if (enable == -1) 1479 return; 1480 1481 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1482 set_osi_linux(enable); 1483 1484 return; 1485 } 1486 1487 /* 1488 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1489 * 1490 * empty string disables _OSI 1491 * string starting with '!' disables that string 1492 * otherwise string is added to list, augmenting built-in strings 1493 */ 1494 static void __init acpi_osi_setup_late(void) 1495 { 1496 struct osi_setup_entry *osi; 1497 char *str; 1498 int i; 1499 acpi_status status; 1500 1501 if (osi_linux.default_disabling) { 1502 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1503 1504 if (ACPI_SUCCESS(status)) 1505 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1506 } 1507 1508 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1509 osi = &osi_setup_entries[i]; 1510 str = osi->string; 1511 1512 if (*str == '\0') 1513 break; 1514 if (osi->enable) { 1515 status = acpi_install_interface(str); 1516 1517 if (ACPI_SUCCESS(status)) 1518 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1519 } else { 1520 status = acpi_remove_interface(str); 1521 1522 if (ACPI_SUCCESS(status)) 1523 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1524 } 1525 } 1526 } 1527 1528 static int __init osi_setup(char *str) 1529 { 1530 if (str && !strcmp("Linux", str)) 1531 acpi_cmdline_osi_linux(1); 1532 else if (str && !strcmp("!Linux", str)) 1533 acpi_cmdline_osi_linux(0); 1534 else 1535 acpi_osi_setup(str); 1536 1537 return 1; 1538 } 1539 1540 __setup("acpi_osi=", osi_setup); 1541 1542 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1543 static int __init acpi_serialize_setup(char *str) 1544 { 1545 printk(KERN_INFO PREFIX "serialize enabled\n"); 1546 1547 acpi_gbl_all_methods_serialized = TRUE; 1548 1549 return 1; 1550 } 1551 1552 __setup("acpi_serialize", acpi_serialize_setup); 1553 1554 /* Check of resource interference between native drivers and ACPI 1555 * OperationRegions (SystemIO and System Memory only). 1556 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1557 * in arbitrary AML code and can interfere with legacy drivers. 1558 * acpi_enforce_resources= can be set to: 1559 * 1560 * - strict (default) (2) 1561 * -> further driver trying to access the resources will not load 1562 * - lax (1) 1563 * -> further driver trying to access the resources will load, but you 1564 * get a system message that something might go wrong... 1565 * 1566 * - no (0) 1567 * -> ACPI Operation Region resources will not be registered 1568 * 1569 */ 1570 #define ENFORCE_RESOURCES_STRICT 2 1571 #define ENFORCE_RESOURCES_LAX 1 1572 #define ENFORCE_RESOURCES_NO 0 1573 1574 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1575 1576 static int __init acpi_enforce_resources_setup(char *str) 1577 { 1578 if (str == NULL || *str == '\0') 1579 return 0; 1580 1581 if (!strcmp("strict", str)) 1582 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1583 else if (!strcmp("lax", str)) 1584 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1585 else if (!strcmp("no", str)) 1586 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1587 1588 return 1; 1589 } 1590 1591 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1592 1593 /* Check for resource conflicts between ACPI OperationRegions and native 1594 * drivers */ 1595 int acpi_check_resource_conflict(const struct resource *res) 1596 { 1597 acpi_adr_space_type space_id; 1598 acpi_size length; 1599 u8 warn = 0; 1600 int clash = 0; 1601 1602 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1603 return 0; 1604 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1605 return 0; 1606 1607 if (res->flags & IORESOURCE_IO) 1608 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1609 else 1610 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1611 1612 length = resource_size(res); 1613 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1614 warn = 1; 1615 clash = acpi_check_address_range(space_id, res->start, length, warn); 1616 1617 if (clash) { 1618 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1619 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1620 printk(KERN_NOTICE "ACPI: This conflict may" 1621 " cause random problems and system" 1622 " instability\n"); 1623 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1624 " for this device, you should use it instead of" 1625 " the native driver\n"); 1626 } 1627 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1628 return -EBUSY; 1629 } 1630 return 0; 1631 } 1632 EXPORT_SYMBOL(acpi_check_resource_conflict); 1633 1634 int acpi_check_region(resource_size_t start, resource_size_t n, 1635 const char *name) 1636 { 1637 struct resource res = { 1638 .start = start, 1639 .end = start + n - 1, 1640 .name = name, 1641 .flags = IORESOURCE_IO, 1642 }; 1643 1644 return acpi_check_resource_conflict(&res); 1645 } 1646 EXPORT_SYMBOL(acpi_check_region); 1647 1648 /* 1649 * Let drivers know whether the resource checks are effective 1650 */ 1651 int acpi_resources_are_enforced(void) 1652 { 1653 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1654 } 1655 EXPORT_SYMBOL(acpi_resources_are_enforced); 1656 1657 /* 1658 * Deallocate the memory for a spinlock. 1659 */ 1660 void acpi_os_delete_lock(acpi_spinlock handle) 1661 { 1662 ACPI_FREE(handle); 1663 } 1664 1665 /* 1666 * Acquire a spinlock. 1667 * 1668 * handle is a pointer to the spinlock_t. 1669 */ 1670 1671 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1672 { 1673 acpi_cpu_flags flags; 1674 spin_lock_irqsave(lockp, flags); 1675 return flags; 1676 } 1677 1678 /* 1679 * Release a spinlock. See above. 1680 */ 1681 1682 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1683 { 1684 spin_unlock_irqrestore(lockp, flags); 1685 } 1686 1687 #ifndef ACPI_USE_LOCAL_CACHE 1688 1689 /******************************************************************************* 1690 * 1691 * FUNCTION: acpi_os_create_cache 1692 * 1693 * PARAMETERS: name - Ascii name for the cache 1694 * size - Size of each cached object 1695 * depth - Maximum depth of the cache (in objects) <ignored> 1696 * cache - Where the new cache object is returned 1697 * 1698 * RETURN: status 1699 * 1700 * DESCRIPTION: Create a cache object 1701 * 1702 ******************************************************************************/ 1703 1704 acpi_status 1705 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1706 { 1707 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1708 if (*cache == NULL) 1709 return AE_ERROR; 1710 else 1711 return AE_OK; 1712 } 1713 1714 /******************************************************************************* 1715 * 1716 * FUNCTION: acpi_os_purge_cache 1717 * 1718 * PARAMETERS: Cache - Handle to cache object 1719 * 1720 * RETURN: Status 1721 * 1722 * DESCRIPTION: Free all objects within the requested cache. 1723 * 1724 ******************************************************************************/ 1725 1726 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1727 { 1728 kmem_cache_shrink(cache); 1729 return (AE_OK); 1730 } 1731 1732 /******************************************************************************* 1733 * 1734 * FUNCTION: acpi_os_delete_cache 1735 * 1736 * PARAMETERS: Cache - Handle to cache object 1737 * 1738 * RETURN: Status 1739 * 1740 * DESCRIPTION: Free all objects within the requested cache and delete the 1741 * cache object. 1742 * 1743 ******************************************************************************/ 1744 1745 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1746 { 1747 kmem_cache_destroy(cache); 1748 return (AE_OK); 1749 } 1750 1751 /******************************************************************************* 1752 * 1753 * FUNCTION: acpi_os_release_object 1754 * 1755 * PARAMETERS: Cache - Handle to cache object 1756 * Object - The object to be released 1757 * 1758 * RETURN: None 1759 * 1760 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1761 * the object is deleted. 1762 * 1763 ******************************************************************************/ 1764 1765 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1766 { 1767 kmem_cache_free(cache, object); 1768 return (AE_OK); 1769 } 1770 #endif 1771 1772 static int __init acpi_no_auto_ssdt_setup(char *s) 1773 { 1774 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n"); 1775 1776 acpi_gbl_disable_ssdt_table_load = TRUE; 1777 1778 return 1; 1779 } 1780 1781 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); 1782 1783 acpi_status __init acpi_os_initialize(void) 1784 { 1785 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1786 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1787 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1788 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1789 1790 return AE_OK; 1791 } 1792 1793 acpi_status __init acpi_os_initialize1(void) 1794 { 1795 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1796 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1797 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1); 1798 BUG_ON(!kacpid_wq); 1799 BUG_ON(!kacpi_notify_wq); 1800 BUG_ON(!kacpi_hotplug_wq); 1801 acpi_install_interface_handler(acpi_osi_handler); 1802 acpi_osi_setup_late(); 1803 return AE_OK; 1804 } 1805 1806 acpi_status acpi_os_terminate(void) 1807 { 1808 if (acpi_irq_handler) { 1809 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1810 acpi_irq_handler); 1811 } 1812 1813 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1814 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1815 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1816 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1817 1818 destroy_workqueue(kacpid_wq); 1819 destroy_workqueue(kacpi_notify_wq); 1820 destroy_workqueue(kacpi_hotplug_wq); 1821 1822 return AE_OK; 1823 } 1824 1825 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1826 u32 pm1b_control) 1827 { 1828 int rc = 0; 1829 if (__acpi_os_prepare_sleep) 1830 rc = __acpi_os_prepare_sleep(sleep_state, 1831 pm1a_control, pm1b_control); 1832 if (rc < 0) 1833 return AE_ERROR; 1834 else if (rc > 0) 1835 return AE_CTRL_SKIP; 1836 1837 return AE_OK; 1838 } 1839 1840 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1841 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1842 { 1843 __acpi_os_prepare_sleep = func; 1844 } 1845 1846 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1847 u32 val_b) 1848 { 1849 int rc = 0; 1850 if (__acpi_os_prepare_extended_sleep) 1851 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1852 val_a, val_b); 1853 if (rc < 0) 1854 return AE_ERROR; 1855 else if (rc > 0) 1856 return AE_CTRL_SKIP; 1857 1858 return AE_OK; 1859 } 1860 1861 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1862 u32 val_a, u32 val_b)) 1863 { 1864 __acpi_os_prepare_extended_sleep = func; 1865 } 1866