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 56 #define _COMPONENT ACPI_OS_SERVICES 57 ACPI_MODULE_NAME("osl"); 58 #define PREFIX "ACPI: " 59 struct acpi_os_dpc { 60 acpi_osd_exec_callback function; 61 void *context; 62 struct work_struct work; 63 int wait; 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 83 static acpi_osd_handler acpi_irq_handler; 84 static void *acpi_irq_context; 85 static struct workqueue_struct *kacpid_wq; 86 static struct workqueue_struct *kacpi_notify_wq; 87 static struct workqueue_struct *kacpi_hotplug_wq; 88 89 /* 90 * This list of permanent mappings is for memory that may be accessed from 91 * interrupt context, where we can't do the ioremap(). 92 */ 93 struct acpi_ioremap { 94 struct list_head list; 95 void __iomem *virt; 96 acpi_physical_address phys; 97 acpi_size size; 98 unsigned long refcount; 99 }; 100 101 static LIST_HEAD(acpi_ioremaps); 102 static DEFINE_MUTEX(acpi_ioremap_lock); 103 104 static void __init acpi_osi_setup_late(void); 105 106 /* 107 * The story of _OSI(Linux) 108 * 109 * From pre-history through Linux-2.6.22, 110 * Linux responded TRUE upon a BIOS OSI(Linux) query. 111 * 112 * Unfortunately, reference BIOS writers got wind of this 113 * and put OSI(Linux) in their example code, quickly exposing 114 * this string as ill-conceived and opening the door to 115 * an un-bounded number of BIOS incompatibilities. 116 * 117 * For example, OSI(Linux) was used on resume to re-POST a 118 * video card on one system, because Linux at that time 119 * could not do a speedy restore in its native driver. 120 * But then upon gaining quick native restore capability, 121 * Linux has no way to tell the BIOS to skip the time-consuming 122 * POST -- putting Linux at a permanent performance disadvantage. 123 * On another system, the BIOS writer used OSI(Linux) 124 * to infer native OS support for IPMI! On other systems, 125 * OSI(Linux) simply got in the way of Linux claiming to 126 * be compatible with other operating systems, exposing 127 * BIOS issues such as skipped device initialization. 128 * 129 * So "Linux" turned out to be a really poor chose of 130 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 131 * 132 * BIOS writers should NOT query _OSI(Linux) on future systems. 133 * Linux will complain on the console when it sees it, and return FALSE. 134 * To get Linux to return TRUE for your system will require 135 * a kernel source update to add a DMI entry, 136 * or boot with "acpi_osi=Linux" 137 */ 138 139 static struct osi_linux { 140 unsigned int enable:1; 141 unsigned int dmi:1; 142 unsigned int cmdline:1; 143 } osi_linux = {0, 0, 0}; 144 145 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 146 { 147 if (!strcmp("Linux", interface)) { 148 149 printk_once(KERN_NOTICE FW_BUG PREFIX 150 "BIOS _OSI(Linux) query %s%s\n", 151 osi_linux.enable ? "honored" : "ignored", 152 osi_linux.cmdline ? " via cmdline" : 153 osi_linux.dmi ? " via DMI" : ""); 154 } 155 156 return supported; 157 } 158 159 static void __init acpi_request_region (struct acpi_generic_address *gas, 160 unsigned int length, char *desc) 161 { 162 u64 addr; 163 164 /* Handle possible alignment issues */ 165 memcpy(&addr, &gas->address, sizeof(addr)); 166 if (!addr || !length) 167 return; 168 169 /* Resources are never freed */ 170 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 171 request_region(addr, length, desc); 172 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 173 request_mem_region(addr, length, desc); 174 } 175 176 static int __init acpi_reserve_resources(void) 177 { 178 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 179 "ACPI PM1a_EVT_BLK"); 180 181 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 182 "ACPI PM1b_EVT_BLK"); 183 184 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 185 "ACPI PM1a_CNT_BLK"); 186 187 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 188 "ACPI PM1b_CNT_BLK"); 189 190 if (acpi_gbl_FADT.pm_timer_length == 4) 191 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 192 193 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 194 "ACPI PM2_CNT_BLK"); 195 196 /* Length of GPE blocks must be a non-negative multiple of 2 */ 197 198 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 199 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 200 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 201 202 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 203 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 204 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 205 206 return 0; 207 } 208 device_initcall(acpi_reserve_resources); 209 210 void acpi_os_printf(const char *fmt, ...) 211 { 212 va_list args; 213 va_start(args, fmt); 214 acpi_os_vprintf(fmt, args); 215 va_end(args); 216 } 217 218 void acpi_os_vprintf(const char *fmt, va_list args) 219 { 220 static char buffer[512]; 221 222 vsprintf(buffer, fmt, args); 223 224 #ifdef ENABLE_DEBUGGER 225 if (acpi_in_debugger) { 226 kdb_printf("%s", buffer); 227 } else { 228 printk(KERN_CONT "%s", buffer); 229 } 230 #else 231 printk(KERN_CONT "%s", buffer); 232 #endif 233 } 234 235 #ifdef CONFIG_KEXEC 236 static unsigned long acpi_rsdp; 237 static int __init setup_acpi_rsdp(char *arg) 238 { 239 acpi_rsdp = simple_strtoul(arg, NULL, 16); 240 return 0; 241 } 242 early_param("acpi_rsdp", setup_acpi_rsdp); 243 #endif 244 245 acpi_physical_address __init acpi_os_get_root_pointer(void) 246 { 247 #ifdef CONFIG_KEXEC 248 if (acpi_rsdp) 249 return acpi_rsdp; 250 #endif 251 252 if (efi_enabled(EFI_CONFIG_TABLES)) { 253 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 254 return efi.acpi20; 255 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 256 return efi.acpi; 257 else { 258 printk(KERN_ERR PREFIX 259 "System description tables not found\n"); 260 return 0; 261 } 262 } else { 263 acpi_physical_address pa = 0; 264 265 acpi_find_root_pointer(&pa); 266 return pa; 267 } 268 } 269 270 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 271 static struct acpi_ioremap * 272 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 273 { 274 struct acpi_ioremap *map; 275 276 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 277 if (map->phys <= phys && 278 phys + size <= map->phys + map->size) 279 return map; 280 281 return NULL; 282 } 283 284 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 285 static void __iomem * 286 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 287 { 288 struct acpi_ioremap *map; 289 290 map = acpi_map_lookup(phys, size); 291 if (map) 292 return map->virt + (phys - map->phys); 293 294 return NULL; 295 } 296 297 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 298 { 299 struct acpi_ioremap *map; 300 void __iomem *virt = NULL; 301 302 mutex_lock(&acpi_ioremap_lock); 303 map = acpi_map_lookup(phys, size); 304 if (map) { 305 virt = map->virt + (phys - map->phys); 306 map->refcount++; 307 } 308 mutex_unlock(&acpi_ioremap_lock); 309 return virt; 310 } 311 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 312 313 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 314 static struct acpi_ioremap * 315 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 316 { 317 struct acpi_ioremap *map; 318 319 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 320 if (map->virt <= virt && 321 virt + size <= map->virt + map->size) 322 return map; 323 324 return NULL; 325 } 326 327 #ifndef CONFIG_IA64 328 #define should_use_kmap(pfn) page_is_ram(pfn) 329 #else 330 /* ioremap will take care of cache attributes */ 331 #define should_use_kmap(pfn) 0 332 #endif 333 334 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 335 { 336 unsigned long pfn; 337 338 pfn = pg_off >> PAGE_SHIFT; 339 if (should_use_kmap(pfn)) { 340 if (pg_sz > PAGE_SIZE) 341 return NULL; 342 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 343 } else 344 return acpi_os_ioremap(pg_off, pg_sz); 345 } 346 347 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 348 { 349 unsigned long pfn; 350 351 pfn = pg_off >> PAGE_SHIFT; 352 if (should_use_kmap(pfn)) 353 kunmap(pfn_to_page(pfn)); 354 else 355 iounmap(vaddr); 356 } 357 358 void __iomem *__init_refok 359 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 360 { 361 struct acpi_ioremap *map; 362 void __iomem *virt; 363 acpi_physical_address pg_off; 364 acpi_size pg_sz; 365 366 if (phys > ULONG_MAX) { 367 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 368 return NULL; 369 } 370 371 if (!acpi_gbl_permanent_mmap) 372 return __acpi_map_table((unsigned long)phys, size); 373 374 mutex_lock(&acpi_ioremap_lock); 375 /* Check if there's a suitable mapping already. */ 376 map = acpi_map_lookup(phys, size); 377 if (map) { 378 map->refcount++; 379 goto out; 380 } 381 382 map = kzalloc(sizeof(*map), GFP_KERNEL); 383 if (!map) { 384 mutex_unlock(&acpi_ioremap_lock); 385 return NULL; 386 } 387 388 pg_off = round_down(phys, PAGE_SIZE); 389 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 390 virt = acpi_map(pg_off, pg_sz); 391 if (!virt) { 392 mutex_unlock(&acpi_ioremap_lock); 393 kfree(map); 394 return NULL; 395 } 396 397 INIT_LIST_HEAD(&map->list); 398 map->virt = virt; 399 map->phys = pg_off; 400 map->size = pg_sz; 401 map->refcount = 1; 402 403 list_add_tail_rcu(&map->list, &acpi_ioremaps); 404 405 out: 406 mutex_unlock(&acpi_ioremap_lock); 407 return map->virt + (phys - map->phys); 408 } 409 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 410 411 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 412 { 413 if (!--map->refcount) 414 list_del_rcu(&map->list); 415 } 416 417 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 418 { 419 if (!map->refcount) { 420 synchronize_rcu(); 421 acpi_unmap(map->phys, map->virt); 422 kfree(map); 423 } 424 } 425 426 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 427 { 428 struct acpi_ioremap *map; 429 430 if (!acpi_gbl_permanent_mmap) { 431 __acpi_unmap_table(virt, size); 432 return; 433 } 434 435 mutex_lock(&acpi_ioremap_lock); 436 map = acpi_map_lookup_virt(virt, size); 437 if (!map) { 438 mutex_unlock(&acpi_ioremap_lock); 439 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 440 return; 441 } 442 acpi_os_drop_map_ref(map); 443 mutex_unlock(&acpi_ioremap_lock); 444 445 acpi_os_map_cleanup(map); 446 } 447 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 448 449 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 450 { 451 if (!acpi_gbl_permanent_mmap) 452 __acpi_unmap_table(virt, size); 453 } 454 455 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 456 { 457 u64 addr; 458 void __iomem *virt; 459 460 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 461 return 0; 462 463 /* Handle possible alignment issues */ 464 memcpy(&addr, &gas->address, sizeof(addr)); 465 if (!addr || !gas->bit_width) 466 return -EINVAL; 467 468 virt = acpi_os_map_memory(addr, gas->bit_width / 8); 469 if (!virt) 470 return -EIO; 471 472 return 0; 473 } 474 EXPORT_SYMBOL(acpi_os_map_generic_address); 475 476 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 477 { 478 u64 addr; 479 struct acpi_ioremap *map; 480 481 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 482 return; 483 484 /* Handle possible alignment issues */ 485 memcpy(&addr, &gas->address, sizeof(addr)); 486 if (!addr || !gas->bit_width) 487 return; 488 489 mutex_lock(&acpi_ioremap_lock); 490 map = acpi_map_lookup(addr, gas->bit_width / 8); 491 if (!map) { 492 mutex_unlock(&acpi_ioremap_lock); 493 return; 494 } 495 acpi_os_drop_map_ref(map); 496 mutex_unlock(&acpi_ioremap_lock); 497 498 acpi_os_map_cleanup(map); 499 } 500 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 501 502 #ifdef ACPI_FUTURE_USAGE 503 acpi_status 504 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 505 { 506 if (!phys || !virt) 507 return AE_BAD_PARAMETER; 508 509 *phys = virt_to_phys(virt); 510 511 return AE_OK; 512 } 513 #endif 514 515 #define ACPI_MAX_OVERRIDE_LEN 100 516 517 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 518 519 acpi_status 520 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 521 acpi_string * new_val) 522 { 523 if (!init_val || !new_val) 524 return AE_BAD_PARAMETER; 525 526 *new_val = NULL; 527 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 528 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 529 acpi_os_name); 530 *new_val = acpi_os_name; 531 } 532 533 return AE_OK; 534 } 535 536 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 537 #include <linux/earlycpio.h> 538 #include <linux/memblock.h> 539 540 static u64 acpi_tables_addr; 541 static int all_tables_size; 542 543 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 544 u8 __init acpi_table_checksum(u8 *buffer, u32 length) 545 { 546 u8 sum = 0; 547 u8 *end = buffer + length; 548 549 while (buffer < end) 550 sum = (u8) (sum + *(buffer++)); 551 return sum; 552 } 553 554 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 555 static const char * const table_sigs[] = { 556 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 557 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 558 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 559 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 560 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 561 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 562 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 563 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 564 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 565 566 /* Non-fatal errors: Affected tables/files are ignored */ 567 #define INVALID_TABLE(x, path, name) \ 568 { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; } 569 570 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 571 572 /* Must not increase 10 or needs code modification below */ 573 #define ACPI_OVERRIDE_TABLES 10 574 575 void __init acpi_initrd_override(void *data, size_t size) 576 { 577 int sig, no, table_nr = 0, total_offset = 0; 578 long offset = 0; 579 struct acpi_table_header *table; 580 char cpio_path[32] = "kernel/firmware/acpi/"; 581 struct cpio_data file; 582 struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES]; 583 char *p; 584 585 if (data == NULL || size == 0) 586 return; 587 588 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 589 file = find_cpio_data(cpio_path, data, size, &offset); 590 if (!file.data) 591 break; 592 593 data += offset; 594 size -= offset; 595 596 if (file.size < sizeof(struct acpi_table_header)) 597 INVALID_TABLE("Table smaller than ACPI header", 598 cpio_path, file.name); 599 600 table = file.data; 601 602 for (sig = 0; table_sigs[sig]; sig++) 603 if (!memcmp(table->signature, table_sigs[sig], 4)) 604 break; 605 606 if (!table_sigs[sig]) 607 INVALID_TABLE("Unknown signature", 608 cpio_path, file.name); 609 if (file.size != table->length) 610 INVALID_TABLE("File length does not match table length", 611 cpio_path, file.name); 612 if (acpi_table_checksum(file.data, table->length)) 613 INVALID_TABLE("Bad table checksum", 614 cpio_path, file.name); 615 616 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 617 table->signature, cpio_path, file.name, table->length); 618 619 all_tables_size += table->length; 620 early_initrd_files[table_nr].data = file.data; 621 early_initrd_files[table_nr].size = file.size; 622 table_nr++; 623 } 624 if (table_nr == 0) 625 return; 626 627 acpi_tables_addr = 628 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 629 all_tables_size, PAGE_SIZE); 630 if (!acpi_tables_addr) { 631 WARN_ON(1); 632 return; 633 } 634 /* 635 * Only calling e820_add_reserve does not work and the 636 * tables are invalid (memory got used) later. 637 * memblock_reserve works as expected and the tables won't get modified. 638 * But it's not enough on X86 because ioremap will 639 * complain later (used by acpi_os_map_memory) that the pages 640 * that should get mapped are not marked "reserved". 641 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 642 * works fine. 643 */ 644 memblock_reserve(acpi_tables_addr, all_tables_size); 645 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 646 647 p = early_ioremap(acpi_tables_addr, all_tables_size); 648 649 for (no = 0; no < table_nr; no++) { 650 memcpy(p + total_offset, early_initrd_files[no].data, 651 early_initrd_files[no].size); 652 total_offset += early_initrd_files[no].size; 653 } 654 early_iounmap(p, all_tables_size); 655 } 656 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 657 658 static void acpi_table_taint(struct acpi_table_header *table) 659 { 660 pr_warn(PREFIX 661 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 662 table->signature, table->oem_table_id); 663 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 664 } 665 666 667 acpi_status 668 acpi_os_table_override(struct acpi_table_header * existing_table, 669 struct acpi_table_header ** new_table) 670 { 671 if (!existing_table || !new_table) 672 return AE_BAD_PARAMETER; 673 674 *new_table = NULL; 675 676 #ifdef CONFIG_ACPI_CUSTOM_DSDT 677 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 678 *new_table = (struct acpi_table_header *)AmlCode; 679 #endif 680 if (*new_table != NULL) 681 acpi_table_taint(existing_table); 682 return AE_OK; 683 } 684 685 acpi_status 686 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 687 acpi_physical_address *address, 688 u32 *table_length) 689 { 690 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 691 *table_length = 0; 692 *address = 0; 693 return AE_OK; 694 #else 695 int table_offset = 0; 696 struct acpi_table_header *table; 697 698 *table_length = 0; 699 *address = 0; 700 701 if (!acpi_tables_addr) 702 return AE_OK; 703 704 do { 705 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 706 WARN_ON(1); 707 return AE_OK; 708 } 709 710 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 711 ACPI_HEADER_SIZE); 712 713 if (table_offset + table->length > all_tables_size) { 714 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 715 WARN_ON(1); 716 return AE_OK; 717 } 718 719 table_offset += table->length; 720 721 if (memcmp(existing_table->signature, table->signature, 4)) { 722 acpi_os_unmap_memory(table, 723 ACPI_HEADER_SIZE); 724 continue; 725 } 726 727 /* Only override tables with matching oem id */ 728 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 729 ACPI_OEM_TABLE_ID_SIZE)) { 730 acpi_os_unmap_memory(table, 731 ACPI_HEADER_SIZE); 732 continue; 733 } 734 735 table_offset -= table->length; 736 *table_length = table->length; 737 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 738 *address = acpi_tables_addr + table_offset; 739 break; 740 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 741 742 if (*address != 0) 743 acpi_table_taint(existing_table); 744 return AE_OK; 745 #endif 746 } 747 748 static irqreturn_t acpi_irq(int irq, void *dev_id) 749 { 750 u32 handled; 751 752 handled = (*acpi_irq_handler) (acpi_irq_context); 753 754 if (handled) { 755 acpi_irq_handled++; 756 return IRQ_HANDLED; 757 } else { 758 acpi_irq_not_handled++; 759 return IRQ_NONE; 760 } 761 } 762 763 acpi_status 764 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 765 void *context) 766 { 767 unsigned int irq; 768 769 acpi_irq_stats_init(); 770 771 /* 772 * ACPI interrupts different from the SCI in our copy of the FADT are 773 * not supported. 774 */ 775 if (gsi != acpi_gbl_FADT.sci_interrupt) 776 return AE_BAD_PARAMETER; 777 778 if (acpi_irq_handler) 779 return AE_ALREADY_ACQUIRED; 780 781 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 782 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 783 gsi); 784 return AE_OK; 785 } 786 787 acpi_irq_handler = handler; 788 acpi_irq_context = context; 789 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) { 790 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 791 acpi_irq_handler = NULL; 792 return AE_NOT_ACQUIRED; 793 } 794 795 return AE_OK; 796 } 797 798 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 799 { 800 if (irq != acpi_gbl_FADT.sci_interrupt) 801 return AE_BAD_PARAMETER; 802 803 free_irq(irq, acpi_irq); 804 acpi_irq_handler = NULL; 805 806 return AE_OK; 807 } 808 809 /* 810 * Running in interpreter thread context, safe to sleep 811 */ 812 813 void acpi_os_sleep(u64 ms) 814 { 815 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 816 } 817 818 void acpi_os_stall(u32 us) 819 { 820 while (us) { 821 u32 delay = 1000; 822 823 if (delay > us) 824 delay = us; 825 udelay(delay); 826 touch_nmi_watchdog(); 827 us -= delay; 828 } 829 } 830 831 /* 832 * Support ACPI 3.0 AML Timer operand 833 * Returns 64-bit free-running, monotonically increasing timer 834 * with 100ns granularity 835 */ 836 u64 acpi_os_get_timer(void) 837 { 838 static u64 t; 839 840 #ifdef CONFIG_HPET 841 /* TBD: use HPET if available */ 842 #endif 843 844 #ifdef CONFIG_X86_PM_TIMER 845 /* TBD: default to PM timer if HPET was not available */ 846 #endif 847 if (!t) 848 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 849 850 return ++t; 851 } 852 853 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 854 { 855 u32 dummy; 856 857 if (!value) 858 value = &dummy; 859 860 *value = 0; 861 if (width <= 8) { 862 *(u8 *) value = inb(port); 863 } else if (width <= 16) { 864 *(u16 *) value = inw(port); 865 } else if (width <= 32) { 866 *(u32 *) value = inl(port); 867 } else { 868 BUG(); 869 } 870 871 return AE_OK; 872 } 873 874 EXPORT_SYMBOL(acpi_os_read_port); 875 876 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 877 { 878 if (width <= 8) { 879 outb(value, port); 880 } else if (width <= 16) { 881 outw(value, port); 882 } else if (width <= 32) { 883 outl(value, port); 884 } else { 885 BUG(); 886 } 887 888 return AE_OK; 889 } 890 891 EXPORT_SYMBOL(acpi_os_write_port); 892 893 #ifdef readq 894 static inline u64 read64(const volatile void __iomem *addr) 895 { 896 return readq(addr); 897 } 898 #else 899 static inline u64 read64(const volatile void __iomem *addr) 900 { 901 u64 l, h; 902 l = readl(addr); 903 h = readl(addr+4); 904 return l | (h << 32); 905 } 906 #endif 907 908 acpi_status 909 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 910 { 911 void __iomem *virt_addr; 912 unsigned int size = width / 8; 913 bool unmap = false; 914 u64 dummy; 915 916 rcu_read_lock(); 917 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 918 if (!virt_addr) { 919 rcu_read_unlock(); 920 virt_addr = acpi_os_ioremap(phys_addr, size); 921 if (!virt_addr) 922 return AE_BAD_ADDRESS; 923 unmap = true; 924 } 925 926 if (!value) 927 value = &dummy; 928 929 switch (width) { 930 case 8: 931 *(u8 *) value = readb(virt_addr); 932 break; 933 case 16: 934 *(u16 *) value = readw(virt_addr); 935 break; 936 case 32: 937 *(u32 *) value = readl(virt_addr); 938 break; 939 case 64: 940 *(u64 *) value = read64(virt_addr); 941 break; 942 default: 943 BUG(); 944 } 945 946 if (unmap) 947 iounmap(virt_addr); 948 else 949 rcu_read_unlock(); 950 951 return AE_OK; 952 } 953 954 #ifdef writeq 955 static inline void write64(u64 val, volatile void __iomem *addr) 956 { 957 writeq(val, addr); 958 } 959 #else 960 static inline void write64(u64 val, volatile void __iomem *addr) 961 { 962 writel(val, addr); 963 writel(val>>32, addr+4); 964 } 965 #endif 966 967 acpi_status 968 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 969 { 970 void __iomem *virt_addr; 971 unsigned int size = width / 8; 972 bool unmap = false; 973 974 rcu_read_lock(); 975 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 976 if (!virt_addr) { 977 rcu_read_unlock(); 978 virt_addr = acpi_os_ioremap(phys_addr, size); 979 if (!virt_addr) 980 return AE_BAD_ADDRESS; 981 unmap = true; 982 } 983 984 switch (width) { 985 case 8: 986 writeb(value, virt_addr); 987 break; 988 case 16: 989 writew(value, virt_addr); 990 break; 991 case 32: 992 writel(value, virt_addr); 993 break; 994 case 64: 995 write64(value, virt_addr); 996 break; 997 default: 998 BUG(); 999 } 1000 1001 if (unmap) 1002 iounmap(virt_addr); 1003 else 1004 rcu_read_unlock(); 1005 1006 return AE_OK; 1007 } 1008 1009 acpi_status 1010 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1011 u64 *value, u32 width) 1012 { 1013 int result, size; 1014 u32 value32; 1015 1016 if (!value) 1017 return AE_BAD_PARAMETER; 1018 1019 switch (width) { 1020 case 8: 1021 size = 1; 1022 break; 1023 case 16: 1024 size = 2; 1025 break; 1026 case 32: 1027 size = 4; 1028 break; 1029 default: 1030 return AE_ERROR; 1031 } 1032 1033 result = raw_pci_read(pci_id->segment, pci_id->bus, 1034 PCI_DEVFN(pci_id->device, pci_id->function), 1035 reg, size, &value32); 1036 *value = value32; 1037 1038 return (result ? AE_ERROR : AE_OK); 1039 } 1040 1041 acpi_status 1042 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1043 u64 value, u32 width) 1044 { 1045 int result, size; 1046 1047 switch (width) { 1048 case 8: 1049 size = 1; 1050 break; 1051 case 16: 1052 size = 2; 1053 break; 1054 case 32: 1055 size = 4; 1056 break; 1057 default: 1058 return AE_ERROR; 1059 } 1060 1061 result = raw_pci_write(pci_id->segment, pci_id->bus, 1062 PCI_DEVFN(pci_id->device, pci_id->function), 1063 reg, size, value); 1064 1065 return (result ? AE_ERROR : AE_OK); 1066 } 1067 1068 static void acpi_os_execute_deferred(struct work_struct *work) 1069 { 1070 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1071 1072 if (dpc->wait) 1073 acpi_os_wait_events_complete(); 1074 1075 dpc->function(dpc->context); 1076 kfree(dpc); 1077 } 1078 1079 /******************************************************************************* 1080 * 1081 * FUNCTION: acpi_os_execute 1082 * 1083 * PARAMETERS: Type - Type of the callback 1084 * Function - Function to be executed 1085 * Context - Function parameters 1086 * 1087 * RETURN: Status 1088 * 1089 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1090 * immediately executes function on a separate thread. 1091 * 1092 ******************************************************************************/ 1093 1094 static acpi_status __acpi_os_execute(acpi_execute_type type, 1095 acpi_osd_exec_callback function, void *context, int hp) 1096 { 1097 acpi_status status = AE_OK; 1098 struct acpi_os_dpc *dpc; 1099 struct workqueue_struct *queue; 1100 int ret; 1101 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1102 "Scheduling function [%p(%p)] for deferred execution.\n", 1103 function, context)); 1104 1105 /* 1106 * Allocate/initialize DPC structure. Note that this memory will be 1107 * freed by the callee. The kernel handles the work_struct list in a 1108 * way that allows us to also free its memory inside the callee. 1109 * Because we may want to schedule several tasks with different 1110 * parameters we can't use the approach some kernel code uses of 1111 * having a static work_struct. 1112 */ 1113 1114 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1115 if (!dpc) 1116 return AE_NO_MEMORY; 1117 1118 dpc->function = function; 1119 dpc->context = context; 1120 1121 /* 1122 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq 1123 * because the hotplug code may call driver .remove() functions, 1124 * which invoke flush_scheduled_work/acpi_os_wait_events_complete 1125 * to flush these workqueues. 1126 * 1127 * To prevent lockdep from complaining unnecessarily, make sure that 1128 * there is a different static lockdep key for each workqueue by using 1129 * INIT_WORK() for each of them separately. 1130 */ 1131 if (hp) { 1132 queue = kacpi_hotplug_wq; 1133 dpc->wait = 1; 1134 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1135 } else if (type == OSL_NOTIFY_HANDLER) { 1136 queue = kacpi_notify_wq; 1137 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1138 } else { 1139 queue = kacpid_wq; 1140 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1141 } 1142 1143 /* 1144 * On some machines, a software-initiated SMI causes corruption unless 1145 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1146 * typically it's done in GPE-related methods that are run via 1147 * workqueues, so we can avoid the known corruption cases by always 1148 * queueing on CPU 0. 1149 */ 1150 ret = queue_work_on(0, queue, &dpc->work); 1151 1152 if (!ret) { 1153 printk(KERN_ERR PREFIX 1154 "Call to queue_work() failed.\n"); 1155 status = AE_ERROR; 1156 kfree(dpc); 1157 } 1158 return status; 1159 } 1160 1161 acpi_status acpi_os_execute(acpi_execute_type type, 1162 acpi_osd_exec_callback function, void *context) 1163 { 1164 return __acpi_os_execute(type, function, context, 0); 1165 } 1166 EXPORT_SYMBOL(acpi_os_execute); 1167 1168 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function, 1169 void *context) 1170 { 1171 return __acpi_os_execute(0, function, context, 1); 1172 } 1173 EXPORT_SYMBOL(acpi_os_hotplug_execute); 1174 1175 void acpi_os_wait_events_complete(void) 1176 { 1177 flush_workqueue(kacpid_wq); 1178 flush_workqueue(kacpi_notify_wq); 1179 } 1180 1181 EXPORT_SYMBOL(acpi_os_wait_events_complete); 1182 1183 acpi_status 1184 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1185 { 1186 struct semaphore *sem = NULL; 1187 1188 sem = acpi_os_allocate(sizeof(struct semaphore)); 1189 if (!sem) 1190 return AE_NO_MEMORY; 1191 memset(sem, 0, sizeof(struct semaphore)); 1192 1193 sema_init(sem, initial_units); 1194 1195 *handle = (acpi_handle *) sem; 1196 1197 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1198 *handle, initial_units)); 1199 1200 return AE_OK; 1201 } 1202 1203 /* 1204 * TODO: A better way to delete semaphores? Linux doesn't have a 1205 * 'delete_semaphore()' function -- may result in an invalid 1206 * pointer dereference for non-synchronized consumers. Should 1207 * we at least check for blocked threads and signal/cancel them? 1208 */ 1209 1210 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1211 { 1212 struct semaphore *sem = (struct semaphore *)handle; 1213 1214 if (!sem) 1215 return AE_BAD_PARAMETER; 1216 1217 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1218 1219 BUG_ON(!list_empty(&sem->wait_list)); 1220 kfree(sem); 1221 sem = NULL; 1222 1223 return AE_OK; 1224 } 1225 1226 /* 1227 * TODO: Support for units > 1? 1228 */ 1229 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1230 { 1231 acpi_status status = AE_OK; 1232 struct semaphore *sem = (struct semaphore *)handle; 1233 long jiffies; 1234 int ret = 0; 1235 1236 if (!sem || (units < 1)) 1237 return AE_BAD_PARAMETER; 1238 1239 if (units > 1) 1240 return AE_SUPPORT; 1241 1242 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1243 handle, units, timeout)); 1244 1245 if (timeout == ACPI_WAIT_FOREVER) 1246 jiffies = MAX_SCHEDULE_TIMEOUT; 1247 else 1248 jiffies = msecs_to_jiffies(timeout); 1249 1250 ret = down_timeout(sem, jiffies); 1251 if (ret) 1252 status = AE_TIME; 1253 1254 if (ACPI_FAILURE(status)) { 1255 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1256 "Failed to acquire semaphore[%p|%d|%d], %s", 1257 handle, units, timeout, 1258 acpi_format_exception(status))); 1259 } else { 1260 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1261 "Acquired semaphore[%p|%d|%d]", handle, 1262 units, timeout)); 1263 } 1264 1265 return status; 1266 } 1267 1268 /* 1269 * TODO: Support for units > 1? 1270 */ 1271 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1272 { 1273 struct semaphore *sem = (struct semaphore *)handle; 1274 1275 if (!sem || (units < 1)) 1276 return AE_BAD_PARAMETER; 1277 1278 if (units > 1) 1279 return AE_SUPPORT; 1280 1281 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1282 units)); 1283 1284 up(sem); 1285 1286 return AE_OK; 1287 } 1288 1289 #ifdef ACPI_FUTURE_USAGE 1290 u32 acpi_os_get_line(char *buffer) 1291 { 1292 1293 #ifdef ENABLE_DEBUGGER 1294 if (acpi_in_debugger) { 1295 u32 chars; 1296 1297 kdb_read(buffer, sizeof(line_buf)); 1298 1299 /* remove the CR kdb includes */ 1300 chars = strlen(buffer) - 1; 1301 buffer[chars] = '\0'; 1302 } 1303 #endif 1304 1305 return 0; 1306 } 1307 #endif /* ACPI_FUTURE_USAGE */ 1308 1309 acpi_status acpi_os_signal(u32 function, void *info) 1310 { 1311 switch (function) { 1312 case ACPI_SIGNAL_FATAL: 1313 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1314 break; 1315 case ACPI_SIGNAL_BREAKPOINT: 1316 /* 1317 * AML Breakpoint 1318 * ACPI spec. says to treat it as a NOP unless 1319 * you are debugging. So if/when we integrate 1320 * AML debugger into the kernel debugger its 1321 * hook will go here. But until then it is 1322 * not useful to print anything on breakpoints. 1323 */ 1324 break; 1325 default: 1326 break; 1327 } 1328 1329 return AE_OK; 1330 } 1331 1332 static int __init acpi_os_name_setup(char *str) 1333 { 1334 char *p = acpi_os_name; 1335 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1336 1337 if (!str || !*str) 1338 return 0; 1339 1340 for (; count-- && str && *str; str++) { 1341 if (isalnum(*str) || *str == ' ' || *str == ':') 1342 *p++ = *str; 1343 else if (*str == '\'' || *str == '"') 1344 continue; 1345 else 1346 break; 1347 } 1348 *p = 0; 1349 1350 return 1; 1351 1352 } 1353 1354 __setup("acpi_os_name=", acpi_os_name_setup); 1355 1356 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1357 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1358 1359 struct osi_setup_entry { 1360 char string[OSI_STRING_LENGTH_MAX]; 1361 bool enable; 1362 }; 1363 1364 static struct osi_setup_entry __initdata 1365 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = { 1366 {"Module Device", true}, 1367 {"Processor Device", true}, 1368 {"3.0 _SCP Extensions", true}, 1369 {"Processor Aggregator Device", true}, 1370 }; 1371 1372 void __init acpi_osi_setup(char *str) 1373 { 1374 struct osi_setup_entry *osi; 1375 bool enable = true; 1376 int i; 1377 1378 if (!acpi_gbl_create_osi_method) 1379 return; 1380 1381 if (str == NULL || *str == '\0') { 1382 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1383 acpi_gbl_create_osi_method = FALSE; 1384 return; 1385 } 1386 1387 if (*str == '!') { 1388 str++; 1389 enable = false; 1390 } 1391 1392 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1393 osi = &osi_setup_entries[i]; 1394 if (!strcmp(osi->string, str)) { 1395 osi->enable = enable; 1396 break; 1397 } else if (osi->string[0] == '\0') { 1398 osi->enable = enable; 1399 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1400 break; 1401 } 1402 } 1403 } 1404 1405 static void __init set_osi_linux(unsigned int enable) 1406 { 1407 if (osi_linux.enable != enable) 1408 osi_linux.enable = enable; 1409 1410 if (osi_linux.enable) 1411 acpi_osi_setup("Linux"); 1412 else 1413 acpi_osi_setup("!Linux"); 1414 1415 return; 1416 } 1417 1418 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1419 { 1420 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1421 osi_linux.dmi = 0; 1422 set_osi_linux(enable); 1423 1424 return; 1425 } 1426 1427 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1428 { 1429 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1430 1431 if (enable == -1) 1432 return; 1433 1434 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1435 set_osi_linux(enable); 1436 1437 return; 1438 } 1439 1440 /* 1441 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1442 * 1443 * empty string disables _OSI 1444 * string starting with '!' disables that string 1445 * otherwise string is added to list, augmenting built-in strings 1446 */ 1447 static void __init acpi_osi_setup_late(void) 1448 { 1449 struct osi_setup_entry *osi; 1450 char *str; 1451 int i; 1452 acpi_status status; 1453 1454 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1455 osi = &osi_setup_entries[i]; 1456 str = osi->string; 1457 1458 if (*str == '\0') 1459 break; 1460 if (osi->enable) { 1461 status = acpi_install_interface(str); 1462 1463 if (ACPI_SUCCESS(status)) 1464 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1465 } else { 1466 status = acpi_remove_interface(str); 1467 1468 if (ACPI_SUCCESS(status)) 1469 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1470 } 1471 } 1472 } 1473 1474 static int __init osi_setup(char *str) 1475 { 1476 if (str && !strcmp("Linux", str)) 1477 acpi_cmdline_osi_linux(1); 1478 else if (str && !strcmp("!Linux", str)) 1479 acpi_cmdline_osi_linux(0); 1480 else 1481 acpi_osi_setup(str); 1482 1483 return 1; 1484 } 1485 1486 __setup("acpi_osi=", osi_setup); 1487 1488 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1489 static int __init acpi_serialize_setup(char *str) 1490 { 1491 printk(KERN_INFO PREFIX "serialize enabled\n"); 1492 1493 acpi_gbl_all_methods_serialized = TRUE; 1494 1495 return 1; 1496 } 1497 1498 __setup("acpi_serialize", acpi_serialize_setup); 1499 1500 /* Check of resource interference between native drivers and ACPI 1501 * OperationRegions (SystemIO and System Memory only). 1502 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1503 * in arbitrary AML code and can interfere with legacy drivers. 1504 * acpi_enforce_resources= can be set to: 1505 * 1506 * - strict (default) (2) 1507 * -> further driver trying to access the resources will not load 1508 * - lax (1) 1509 * -> further driver trying to access the resources will load, but you 1510 * get a system message that something might go wrong... 1511 * 1512 * - no (0) 1513 * -> ACPI Operation Region resources will not be registered 1514 * 1515 */ 1516 #define ENFORCE_RESOURCES_STRICT 2 1517 #define ENFORCE_RESOURCES_LAX 1 1518 #define ENFORCE_RESOURCES_NO 0 1519 1520 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1521 1522 static int __init acpi_enforce_resources_setup(char *str) 1523 { 1524 if (str == NULL || *str == '\0') 1525 return 0; 1526 1527 if (!strcmp("strict", str)) 1528 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1529 else if (!strcmp("lax", str)) 1530 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1531 else if (!strcmp("no", str)) 1532 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1533 1534 return 1; 1535 } 1536 1537 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1538 1539 /* Check for resource conflicts between ACPI OperationRegions and native 1540 * drivers */ 1541 int acpi_check_resource_conflict(const struct resource *res) 1542 { 1543 acpi_adr_space_type space_id; 1544 acpi_size length; 1545 u8 warn = 0; 1546 int clash = 0; 1547 1548 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1549 return 0; 1550 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1551 return 0; 1552 1553 if (res->flags & IORESOURCE_IO) 1554 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1555 else 1556 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1557 1558 length = resource_size(res); 1559 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1560 warn = 1; 1561 clash = acpi_check_address_range(space_id, res->start, length, warn); 1562 1563 if (clash) { 1564 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1565 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1566 printk(KERN_NOTICE "ACPI: This conflict may" 1567 " cause random problems and system" 1568 " instability\n"); 1569 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1570 " for this device, you should use it instead of" 1571 " the native driver\n"); 1572 } 1573 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1574 return -EBUSY; 1575 } 1576 return 0; 1577 } 1578 EXPORT_SYMBOL(acpi_check_resource_conflict); 1579 1580 int acpi_check_region(resource_size_t start, resource_size_t n, 1581 const char *name) 1582 { 1583 struct resource res = { 1584 .start = start, 1585 .end = start + n - 1, 1586 .name = name, 1587 .flags = IORESOURCE_IO, 1588 }; 1589 1590 return acpi_check_resource_conflict(&res); 1591 } 1592 EXPORT_SYMBOL(acpi_check_region); 1593 1594 /* 1595 * Let drivers know whether the resource checks are effective 1596 */ 1597 int acpi_resources_are_enforced(void) 1598 { 1599 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1600 } 1601 EXPORT_SYMBOL(acpi_resources_are_enforced); 1602 1603 /* 1604 * Deallocate the memory for a spinlock. 1605 */ 1606 void acpi_os_delete_lock(acpi_spinlock handle) 1607 { 1608 ACPI_FREE(handle); 1609 } 1610 1611 /* 1612 * Acquire a spinlock. 1613 * 1614 * handle is a pointer to the spinlock_t. 1615 */ 1616 1617 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1618 { 1619 acpi_cpu_flags flags; 1620 spin_lock_irqsave(lockp, flags); 1621 return flags; 1622 } 1623 1624 /* 1625 * Release a spinlock. See above. 1626 */ 1627 1628 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1629 { 1630 spin_unlock_irqrestore(lockp, flags); 1631 } 1632 1633 #ifndef ACPI_USE_LOCAL_CACHE 1634 1635 /******************************************************************************* 1636 * 1637 * FUNCTION: acpi_os_create_cache 1638 * 1639 * PARAMETERS: name - Ascii name for the cache 1640 * size - Size of each cached object 1641 * depth - Maximum depth of the cache (in objects) <ignored> 1642 * cache - Where the new cache object is returned 1643 * 1644 * RETURN: status 1645 * 1646 * DESCRIPTION: Create a cache object 1647 * 1648 ******************************************************************************/ 1649 1650 acpi_status 1651 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1652 { 1653 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1654 if (*cache == NULL) 1655 return AE_ERROR; 1656 else 1657 return AE_OK; 1658 } 1659 1660 /******************************************************************************* 1661 * 1662 * FUNCTION: acpi_os_purge_cache 1663 * 1664 * PARAMETERS: Cache - Handle to cache object 1665 * 1666 * RETURN: Status 1667 * 1668 * DESCRIPTION: Free all objects within the requested cache. 1669 * 1670 ******************************************************************************/ 1671 1672 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1673 { 1674 kmem_cache_shrink(cache); 1675 return (AE_OK); 1676 } 1677 1678 /******************************************************************************* 1679 * 1680 * FUNCTION: acpi_os_delete_cache 1681 * 1682 * PARAMETERS: Cache - Handle to cache object 1683 * 1684 * RETURN: Status 1685 * 1686 * DESCRIPTION: Free all objects within the requested cache and delete the 1687 * cache object. 1688 * 1689 ******************************************************************************/ 1690 1691 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1692 { 1693 kmem_cache_destroy(cache); 1694 return (AE_OK); 1695 } 1696 1697 /******************************************************************************* 1698 * 1699 * FUNCTION: acpi_os_release_object 1700 * 1701 * PARAMETERS: Cache - Handle to cache object 1702 * Object - The object to be released 1703 * 1704 * RETURN: None 1705 * 1706 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1707 * the object is deleted. 1708 * 1709 ******************************************************************************/ 1710 1711 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1712 { 1713 kmem_cache_free(cache, object); 1714 return (AE_OK); 1715 } 1716 #endif 1717 1718 acpi_status __init acpi_os_initialize(void) 1719 { 1720 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1721 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1722 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1723 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1724 1725 return AE_OK; 1726 } 1727 1728 acpi_status __init acpi_os_initialize1(void) 1729 { 1730 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1731 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1732 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1); 1733 BUG_ON(!kacpid_wq); 1734 BUG_ON(!kacpi_notify_wq); 1735 BUG_ON(!kacpi_hotplug_wq); 1736 acpi_install_interface_handler(acpi_osi_handler); 1737 acpi_osi_setup_late(); 1738 return AE_OK; 1739 } 1740 1741 acpi_status acpi_os_terminate(void) 1742 { 1743 if (acpi_irq_handler) { 1744 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1745 acpi_irq_handler); 1746 } 1747 1748 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1749 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1750 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1751 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1752 1753 destroy_workqueue(kacpid_wq); 1754 destroy_workqueue(kacpi_notify_wq); 1755 destroy_workqueue(kacpi_hotplug_wq); 1756 1757 return AE_OK; 1758 } 1759 1760 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1761 u32 pm1b_control) 1762 { 1763 int rc = 0; 1764 if (__acpi_os_prepare_sleep) 1765 rc = __acpi_os_prepare_sleep(sleep_state, 1766 pm1a_control, pm1b_control); 1767 if (rc < 0) 1768 return AE_ERROR; 1769 else if (rc > 0) 1770 return AE_CTRL_SKIP; 1771 1772 return AE_OK; 1773 } 1774 1775 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1776 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1777 { 1778 __acpi_os_prepare_sleep = func; 1779 } 1780 1781 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context, 1782 void (*func)(struct work_struct *work)) 1783 { 1784 struct acpi_hp_work *hp_work; 1785 int ret; 1786 1787 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); 1788 if (!hp_work) 1789 return; 1790 1791 hp_work->handle = handle; 1792 hp_work->type = type; 1793 hp_work->context = context; 1794 1795 INIT_WORK(&hp_work->work, func); 1796 ret = queue_work(kacpi_hotplug_wq, &hp_work->work); 1797 if (!ret) 1798 kfree(hp_work); 1799 } 1800 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work); 1801