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