1 /* 2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $) 3 * 4 * Copyright (C) 2000 Andrew Henroid 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * Copyright (c) 2008 Intel Corporation 8 * Author: Matthew Wilcox <willy@linux.intel.com> 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 27 * 28 */ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/slab.h> 33 #include <linux/mm.h> 34 #include <linux/highmem.h> 35 #include <linux/pci.h> 36 #include <linux/interrupt.h> 37 #include <linux/kmod.h> 38 #include <linux/delay.h> 39 #include <linux/workqueue.h> 40 #include <linux/nmi.h> 41 #include <linux/acpi.h> 42 #include <linux/efi.h> 43 #include <linux/ioport.h> 44 #include <linux/list.h> 45 #include <linux/jiffies.h> 46 #include <linux/semaphore.h> 47 48 #include <asm/io.h> 49 #include <asm/uaccess.h> 50 51 #include "internal.h" 52 53 #define _COMPONENT ACPI_OS_SERVICES 54 ACPI_MODULE_NAME("osl"); 55 56 struct acpi_os_dpc { 57 acpi_osd_exec_callback function; 58 void *context; 59 struct work_struct work; 60 }; 61 62 #ifdef CONFIG_ACPI_CUSTOM_DSDT 63 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 64 #endif 65 66 #ifdef ENABLE_DEBUGGER 67 #include <linux/kdb.h> 68 69 /* stuff for debugger support */ 70 int acpi_in_debugger; 71 EXPORT_SYMBOL(acpi_in_debugger); 72 73 extern char line_buf[80]; 74 #endif /*ENABLE_DEBUGGER */ 75 76 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl, 77 u32 pm1b_ctrl); 78 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a, 79 u32 val_b); 80 81 static acpi_osd_handler acpi_irq_handler; 82 static void *acpi_irq_context; 83 static struct workqueue_struct *kacpid_wq; 84 static struct workqueue_struct *kacpi_notify_wq; 85 static struct workqueue_struct *kacpi_hotplug_wq; 86 87 /* 88 * This list of permanent mappings is for memory that may be accessed from 89 * interrupt context, where we can't do the ioremap(). 90 */ 91 struct acpi_ioremap { 92 struct list_head list; 93 void __iomem *virt; 94 acpi_physical_address phys; 95 acpi_size size; 96 unsigned long refcount; 97 }; 98 99 static LIST_HEAD(acpi_ioremaps); 100 static DEFINE_MUTEX(acpi_ioremap_lock); 101 102 static void __init acpi_osi_setup_late(void); 103 104 /* 105 * The story of _OSI(Linux) 106 * 107 * From pre-history through Linux-2.6.22, 108 * Linux responded TRUE upon a BIOS OSI(Linux) query. 109 * 110 * Unfortunately, reference BIOS writers got wind of this 111 * and put OSI(Linux) in their example code, quickly exposing 112 * this string as ill-conceived and opening the door to 113 * an un-bounded number of BIOS incompatibilities. 114 * 115 * For example, OSI(Linux) was used on resume to re-POST a 116 * video card on one system, because Linux at that time 117 * could not do a speedy restore in its native driver. 118 * But then upon gaining quick native restore capability, 119 * Linux has no way to tell the BIOS to skip the time-consuming 120 * POST -- putting Linux at a permanent performance disadvantage. 121 * On another system, the BIOS writer used OSI(Linux) 122 * to infer native OS support for IPMI! On other systems, 123 * OSI(Linux) simply got in the way of Linux claiming to 124 * be compatible with other operating systems, exposing 125 * BIOS issues such as skipped device initialization. 126 * 127 * So "Linux" turned out to be a really poor chose of 128 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 129 * 130 * BIOS writers should NOT query _OSI(Linux) on future systems. 131 * Linux will complain on the console when it sees it, and return FALSE. 132 * To get Linux to return TRUE for your system will require 133 * a kernel source update to add a DMI entry, 134 * or boot with "acpi_osi=Linux" 135 */ 136 137 static struct osi_linux { 138 unsigned int enable:1; 139 unsigned int dmi:1; 140 unsigned int cmdline:1; 141 unsigned int default_disabling:1; 142 } osi_linux = {0, 0, 0, 0}; 143 144 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 145 { 146 if (!strcmp("Linux", interface)) { 147 148 printk_once(KERN_NOTICE FW_BUG PREFIX 149 "BIOS _OSI(Linux) query %s%s\n", 150 osi_linux.enable ? "honored" : "ignored", 151 osi_linux.cmdline ? " via cmdline" : 152 osi_linux.dmi ? " via DMI" : ""); 153 } 154 155 if (!strcmp("Darwin", interface)) { 156 /* 157 * Apple firmware will behave poorly if it receives positive 158 * answers to "Darwin" and any other OS. Respond positively 159 * to Darwin and then disable all other vendor strings. 160 */ 161 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 162 supported = ACPI_UINT32_MAX; 163 } 164 165 return supported; 166 } 167 168 static void __init acpi_request_region (struct acpi_generic_address *gas, 169 unsigned int length, char *desc) 170 { 171 u64 addr; 172 173 /* Handle possible alignment issues */ 174 memcpy(&addr, &gas->address, sizeof(addr)); 175 if (!addr || !length) 176 return; 177 178 /* Resources are never freed */ 179 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 180 request_region(addr, length, desc); 181 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 182 request_mem_region(addr, length, desc); 183 } 184 185 static int __init acpi_reserve_resources(void) 186 { 187 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 188 "ACPI PM1a_EVT_BLK"); 189 190 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 191 "ACPI PM1b_EVT_BLK"); 192 193 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 194 "ACPI PM1a_CNT_BLK"); 195 196 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 197 "ACPI PM1b_CNT_BLK"); 198 199 if (acpi_gbl_FADT.pm_timer_length == 4) 200 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 201 202 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 203 "ACPI PM2_CNT_BLK"); 204 205 /* Length of GPE blocks must be a non-negative multiple of 2 */ 206 207 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 208 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 209 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 210 211 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 212 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 213 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 214 215 return 0; 216 } 217 device_initcall(acpi_reserve_resources); 218 219 void acpi_os_printf(const char *fmt, ...) 220 { 221 va_list args; 222 va_start(args, fmt); 223 acpi_os_vprintf(fmt, args); 224 va_end(args); 225 } 226 227 void acpi_os_vprintf(const char *fmt, va_list args) 228 { 229 static char buffer[512]; 230 231 vsprintf(buffer, fmt, args); 232 233 #ifdef ENABLE_DEBUGGER 234 if (acpi_in_debugger) { 235 kdb_printf("%s", buffer); 236 } else { 237 printk(KERN_CONT "%s", buffer); 238 } 239 #else 240 printk(KERN_CONT "%s", buffer); 241 #endif 242 } 243 244 #ifdef CONFIG_KEXEC 245 static unsigned long acpi_rsdp; 246 static int __init setup_acpi_rsdp(char *arg) 247 { 248 if (kstrtoul(arg, 16, &acpi_rsdp)) 249 return -EINVAL; 250 return 0; 251 } 252 early_param("acpi_rsdp", setup_acpi_rsdp); 253 #endif 254 255 acpi_physical_address __init acpi_os_get_root_pointer(void) 256 { 257 #ifdef CONFIG_KEXEC 258 if (acpi_rsdp) 259 return acpi_rsdp; 260 #endif 261 262 if (efi_enabled(EFI_CONFIG_TABLES)) { 263 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 264 return efi.acpi20; 265 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 266 return efi.acpi; 267 else { 268 printk(KERN_ERR PREFIX 269 "System description tables not found\n"); 270 return 0; 271 } 272 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) { 273 acpi_physical_address pa = 0; 274 275 acpi_find_root_pointer(&pa); 276 return pa; 277 } 278 279 return 0; 280 } 281 282 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 283 static struct acpi_ioremap * 284 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 285 { 286 struct acpi_ioremap *map; 287 288 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 289 if (map->phys <= phys && 290 phys + size <= map->phys + map->size) 291 return map; 292 293 return NULL; 294 } 295 296 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 297 static void __iomem * 298 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 299 { 300 struct acpi_ioremap *map; 301 302 map = acpi_map_lookup(phys, size); 303 if (map) 304 return map->virt + (phys - map->phys); 305 306 return NULL; 307 } 308 309 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 310 { 311 struct acpi_ioremap *map; 312 void __iomem *virt = NULL; 313 314 mutex_lock(&acpi_ioremap_lock); 315 map = acpi_map_lookup(phys, size); 316 if (map) { 317 virt = map->virt + (phys - map->phys); 318 map->refcount++; 319 } 320 mutex_unlock(&acpi_ioremap_lock); 321 return virt; 322 } 323 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 324 325 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 326 static struct acpi_ioremap * 327 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 328 { 329 struct acpi_ioremap *map; 330 331 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 332 if (map->virt <= virt && 333 virt + size <= map->virt + map->size) 334 return map; 335 336 return NULL; 337 } 338 339 #ifndef CONFIG_IA64 340 #define should_use_kmap(pfn) page_is_ram(pfn) 341 #else 342 /* ioremap will take care of cache attributes */ 343 #define should_use_kmap(pfn) 0 344 #endif 345 346 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 347 { 348 unsigned long pfn; 349 350 pfn = pg_off >> PAGE_SHIFT; 351 if (should_use_kmap(pfn)) { 352 if (pg_sz > PAGE_SIZE) 353 return NULL; 354 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 355 } else 356 return acpi_os_ioremap(pg_off, pg_sz); 357 } 358 359 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 360 { 361 unsigned long pfn; 362 363 pfn = pg_off >> PAGE_SHIFT; 364 if (should_use_kmap(pfn)) 365 kunmap(pfn_to_page(pfn)); 366 else 367 iounmap(vaddr); 368 } 369 370 void __iomem *__init_refok 371 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size) 372 { 373 struct acpi_ioremap *map; 374 void __iomem *virt; 375 acpi_physical_address pg_off; 376 acpi_size pg_sz; 377 378 if (phys > ULONG_MAX) { 379 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 380 return NULL; 381 } 382 383 if (!acpi_gbl_permanent_mmap) 384 return __acpi_map_table((unsigned long)phys, size); 385 386 mutex_lock(&acpi_ioremap_lock); 387 /* Check if there's a suitable mapping already. */ 388 map = acpi_map_lookup(phys, size); 389 if (map) { 390 map->refcount++; 391 goto out; 392 } 393 394 map = kzalloc(sizeof(*map), GFP_KERNEL); 395 if (!map) { 396 mutex_unlock(&acpi_ioremap_lock); 397 return NULL; 398 } 399 400 pg_off = round_down(phys, PAGE_SIZE); 401 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 402 virt = acpi_map(pg_off, pg_sz); 403 if (!virt) { 404 mutex_unlock(&acpi_ioremap_lock); 405 kfree(map); 406 return NULL; 407 } 408 409 INIT_LIST_HEAD(&map->list); 410 map->virt = virt; 411 map->phys = pg_off; 412 map->size = pg_sz; 413 map->refcount = 1; 414 415 list_add_tail_rcu(&map->list, &acpi_ioremaps); 416 417 out: 418 mutex_unlock(&acpi_ioremap_lock); 419 return map->virt + (phys - map->phys); 420 } 421 EXPORT_SYMBOL_GPL(acpi_os_map_iomem); 422 423 void *__init_refok 424 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 425 { 426 return (void *)acpi_os_map_iomem(phys, size); 427 } 428 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 429 430 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 431 { 432 if (!--map->refcount) 433 list_del_rcu(&map->list); 434 } 435 436 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 437 { 438 if (!map->refcount) { 439 synchronize_rcu(); 440 acpi_unmap(map->phys, map->virt); 441 kfree(map); 442 } 443 } 444 445 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) 446 { 447 struct acpi_ioremap *map; 448 449 if (!acpi_gbl_permanent_mmap) { 450 __acpi_unmap_table(virt, size); 451 return; 452 } 453 454 mutex_lock(&acpi_ioremap_lock); 455 map = acpi_map_lookup_virt(virt, size); 456 if (!map) { 457 mutex_unlock(&acpi_ioremap_lock); 458 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 459 return; 460 } 461 acpi_os_drop_map_ref(map); 462 mutex_unlock(&acpi_ioremap_lock); 463 464 acpi_os_map_cleanup(map); 465 } 466 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem); 467 468 void __ref acpi_os_unmap_memory(void *virt, acpi_size size) 469 { 470 return acpi_os_unmap_iomem((void __iomem *)virt, size); 471 } 472 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 473 474 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 475 { 476 if (!acpi_gbl_permanent_mmap) 477 __acpi_unmap_table(virt, size); 478 } 479 480 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 481 { 482 u64 addr; 483 void __iomem *virt; 484 485 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 486 return 0; 487 488 /* Handle possible alignment issues */ 489 memcpy(&addr, &gas->address, sizeof(addr)); 490 if (!addr || !gas->bit_width) 491 return -EINVAL; 492 493 virt = acpi_os_map_iomem(addr, gas->bit_width / 8); 494 if (!virt) 495 return -EIO; 496 497 return 0; 498 } 499 EXPORT_SYMBOL(acpi_os_map_generic_address); 500 501 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 502 { 503 u64 addr; 504 struct acpi_ioremap *map; 505 506 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 507 return; 508 509 /* Handle possible alignment issues */ 510 memcpy(&addr, &gas->address, sizeof(addr)); 511 if (!addr || !gas->bit_width) 512 return; 513 514 mutex_lock(&acpi_ioremap_lock); 515 map = acpi_map_lookup(addr, gas->bit_width / 8); 516 if (!map) { 517 mutex_unlock(&acpi_ioremap_lock); 518 return; 519 } 520 acpi_os_drop_map_ref(map); 521 mutex_unlock(&acpi_ioremap_lock); 522 523 acpi_os_map_cleanup(map); 524 } 525 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 526 527 #ifdef ACPI_FUTURE_USAGE 528 acpi_status 529 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 530 { 531 if (!phys || !virt) 532 return AE_BAD_PARAMETER; 533 534 *phys = virt_to_phys(virt); 535 536 return AE_OK; 537 } 538 #endif 539 540 #define ACPI_MAX_OVERRIDE_LEN 100 541 542 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 543 544 acpi_status 545 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 546 acpi_string * new_val) 547 { 548 if (!init_val || !new_val) 549 return AE_BAD_PARAMETER; 550 551 *new_val = NULL; 552 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 553 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 554 acpi_os_name); 555 *new_val = acpi_os_name; 556 } 557 558 return AE_OK; 559 } 560 561 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 562 #include <linux/earlycpio.h> 563 #include <linux/memblock.h> 564 565 static u64 acpi_tables_addr; 566 static int all_tables_size; 567 568 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 569 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 570 { 571 u8 sum = 0; 572 u8 *end = buffer + length; 573 574 while (buffer < end) 575 sum = (u8) (sum + *(buffer++)); 576 return sum; 577 } 578 579 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 580 static const char * const table_sigs[] = { 581 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 582 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 583 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 584 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 585 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 586 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 587 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 588 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 589 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 590 591 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 592 593 #define ACPI_OVERRIDE_TABLES 64 594 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 595 596 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 597 598 void __init acpi_initrd_override(void *data, size_t size) 599 { 600 int sig, no, table_nr = 0, total_offset = 0; 601 long offset = 0; 602 struct acpi_table_header *table; 603 char cpio_path[32] = "kernel/firmware/acpi/"; 604 struct cpio_data file; 605 606 if (data == NULL || size == 0) 607 return; 608 609 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 610 file = find_cpio_data(cpio_path, data, size, &offset); 611 if (!file.data) 612 break; 613 614 data += offset; 615 size -= offset; 616 617 if (file.size < sizeof(struct acpi_table_header)) { 618 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 619 cpio_path, file.name); 620 continue; 621 } 622 623 table = file.data; 624 625 for (sig = 0; table_sigs[sig]; sig++) 626 if (!memcmp(table->signature, table_sigs[sig], 4)) 627 break; 628 629 if (!table_sigs[sig]) { 630 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 631 cpio_path, file.name); 632 continue; 633 } 634 if (file.size != table->length) { 635 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 636 cpio_path, file.name); 637 continue; 638 } 639 if (acpi_table_checksum(file.data, table->length)) { 640 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 641 cpio_path, file.name); 642 continue; 643 } 644 645 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 646 table->signature, cpio_path, file.name, table->length); 647 648 all_tables_size += table->length; 649 acpi_initrd_files[table_nr].data = file.data; 650 acpi_initrd_files[table_nr].size = file.size; 651 table_nr++; 652 } 653 if (table_nr == 0) 654 return; 655 656 acpi_tables_addr = 657 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 658 all_tables_size, PAGE_SIZE); 659 if (!acpi_tables_addr) { 660 WARN_ON(1); 661 return; 662 } 663 /* 664 * Only calling e820_add_reserve does not work and the 665 * tables are invalid (memory got used) later. 666 * memblock_reserve works as expected and the tables won't get modified. 667 * But it's not enough on X86 because ioremap will 668 * complain later (used by acpi_os_map_memory) that the pages 669 * that should get mapped are not marked "reserved". 670 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 671 * works fine. 672 */ 673 memblock_reserve(acpi_tables_addr, all_tables_size); 674 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 675 676 /* 677 * early_ioremap only can remap 256k one time. If we map all 678 * tables one time, we will hit the limit. Need to map chunks 679 * one by one during copying the same as that in relocate_initrd(). 680 */ 681 for (no = 0; no < table_nr; no++) { 682 unsigned char *src_p = acpi_initrd_files[no].data; 683 phys_addr_t size = acpi_initrd_files[no].size; 684 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 685 phys_addr_t slop, clen; 686 char *dest_p; 687 688 total_offset += size; 689 690 while (size) { 691 slop = dest_addr & ~PAGE_MASK; 692 clen = size; 693 if (clen > MAP_CHUNK_SIZE - slop) 694 clen = MAP_CHUNK_SIZE - slop; 695 dest_p = early_ioremap(dest_addr & PAGE_MASK, 696 clen + slop); 697 memcpy(dest_p + slop, src_p, clen); 698 early_iounmap(dest_p, clen + slop); 699 src_p += clen; 700 dest_addr += clen; 701 size -= clen; 702 } 703 } 704 } 705 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 706 707 static void acpi_table_taint(struct acpi_table_header *table) 708 { 709 pr_warn(PREFIX 710 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 711 table->signature, table->oem_table_id); 712 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 713 } 714 715 716 acpi_status 717 acpi_os_table_override(struct acpi_table_header * existing_table, 718 struct acpi_table_header ** new_table) 719 { 720 if (!existing_table || !new_table) 721 return AE_BAD_PARAMETER; 722 723 *new_table = NULL; 724 725 #ifdef CONFIG_ACPI_CUSTOM_DSDT 726 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 727 *new_table = (struct acpi_table_header *)AmlCode; 728 #endif 729 if (*new_table != NULL) 730 acpi_table_taint(existing_table); 731 return AE_OK; 732 } 733 734 acpi_status 735 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 736 acpi_physical_address *address, 737 u32 *table_length) 738 { 739 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 740 *table_length = 0; 741 *address = 0; 742 return AE_OK; 743 #else 744 int table_offset = 0; 745 struct acpi_table_header *table; 746 747 *table_length = 0; 748 *address = 0; 749 750 if (!acpi_tables_addr) 751 return AE_OK; 752 753 do { 754 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 755 WARN_ON(1); 756 return AE_OK; 757 } 758 759 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 760 ACPI_HEADER_SIZE); 761 762 if (table_offset + table->length > all_tables_size) { 763 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 764 WARN_ON(1); 765 return AE_OK; 766 } 767 768 table_offset += table->length; 769 770 if (memcmp(existing_table->signature, table->signature, 4)) { 771 acpi_os_unmap_memory(table, 772 ACPI_HEADER_SIZE); 773 continue; 774 } 775 776 /* Only override tables with matching oem id */ 777 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 778 ACPI_OEM_TABLE_ID_SIZE)) { 779 acpi_os_unmap_memory(table, 780 ACPI_HEADER_SIZE); 781 continue; 782 } 783 784 table_offset -= table->length; 785 *table_length = table->length; 786 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 787 *address = acpi_tables_addr + table_offset; 788 break; 789 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 790 791 if (*address != 0) 792 acpi_table_taint(existing_table); 793 return AE_OK; 794 #endif 795 } 796 797 static irqreturn_t acpi_irq(int irq, void *dev_id) 798 { 799 u32 handled; 800 801 handled = (*acpi_irq_handler) (acpi_irq_context); 802 803 if (handled) { 804 acpi_irq_handled++; 805 return IRQ_HANDLED; 806 } else { 807 acpi_irq_not_handled++; 808 return IRQ_NONE; 809 } 810 } 811 812 acpi_status 813 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 814 void *context) 815 { 816 unsigned int irq; 817 818 acpi_irq_stats_init(); 819 820 /* 821 * ACPI interrupts different from the SCI in our copy of the FADT are 822 * not supported. 823 */ 824 if (gsi != acpi_gbl_FADT.sci_interrupt) 825 return AE_BAD_PARAMETER; 826 827 if (acpi_irq_handler) 828 return AE_ALREADY_ACQUIRED; 829 830 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 831 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 832 gsi); 833 return AE_OK; 834 } 835 836 acpi_irq_handler = handler; 837 acpi_irq_context = context; 838 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 839 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 840 acpi_irq_handler = NULL; 841 return AE_NOT_ACQUIRED; 842 } 843 844 return AE_OK; 845 } 846 847 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 848 { 849 if (irq != acpi_gbl_FADT.sci_interrupt) 850 return AE_BAD_PARAMETER; 851 852 free_irq(irq, acpi_irq); 853 acpi_irq_handler = NULL; 854 855 return AE_OK; 856 } 857 858 /* 859 * Running in interpreter thread context, safe to sleep 860 */ 861 862 void acpi_os_sleep(u64 ms) 863 { 864 msleep(ms); 865 } 866 867 void acpi_os_stall(u32 us) 868 { 869 while (us) { 870 u32 delay = 1000; 871 872 if (delay > us) 873 delay = us; 874 udelay(delay); 875 touch_nmi_watchdog(); 876 us -= delay; 877 } 878 } 879 880 /* 881 * Support ACPI 3.0 AML Timer operand 882 * Returns 64-bit free-running, monotonically increasing timer 883 * with 100ns granularity 884 */ 885 u64 acpi_os_get_timer(void) 886 { 887 u64 time_ns = ktime_to_ns(ktime_get()); 888 do_div(time_ns, 100); 889 return time_ns; 890 } 891 892 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 893 { 894 u32 dummy; 895 896 if (!value) 897 value = &dummy; 898 899 *value = 0; 900 if (width <= 8) { 901 *(u8 *) value = inb(port); 902 } else if (width <= 16) { 903 *(u16 *) value = inw(port); 904 } else if (width <= 32) { 905 *(u32 *) value = inl(port); 906 } else { 907 BUG(); 908 } 909 910 return AE_OK; 911 } 912 913 EXPORT_SYMBOL(acpi_os_read_port); 914 915 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 916 { 917 if (width <= 8) { 918 outb(value, port); 919 } else if (width <= 16) { 920 outw(value, port); 921 } else if (width <= 32) { 922 outl(value, port); 923 } else { 924 BUG(); 925 } 926 927 return AE_OK; 928 } 929 930 EXPORT_SYMBOL(acpi_os_write_port); 931 932 #ifdef readq 933 static inline u64 read64(const volatile void __iomem *addr) 934 { 935 return readq(addr); 936 } 937 #else 938 static inline u64 read64(const volatile void __iomem *addr) 939 { 940 u64 l, h; 941 l = readl(addr); 942 h = readl(addr+4); 943 return l | (h << 32); 944 } 945 #endif 946 947 acpi_status 948 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 949 { 950 void __iomem *virt_addr; 951 unsigned int size = width / 8; 952 bool unmap = false; 953 u64 dummy; 954 955 rcu_read_lock(); 956 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 957 if (!virt_addr) { 958 rcu_read_unlock(); 959 virt_addr = acpi_os_ioremap(phys_addr, size); 960 if (!virt_addr) 961 return AE_BAD_ADDRESS; 962 unmap = true; 963 } 964 965 if (!value) 966 value = &dummy; 967 968 switch (width) { 969 case 8: 970 *(u8 *) value = readb(virt_addr); 971 break; 972 case 16: 973 *(u16 *) value = readw(virt_addr); 974 break; 975 case 32: 976 *(u32 *) value = readl(virt_addr); 977 break; 978 case 64: 979 *(u64 *) value = read64(virt_addr); 980 break; 981 default: 982 BUG(); 983 } 984 985 if (unmap) 986 iounmap(virt_addr); 987 else 988 rcu_read_unlock(); 989 990 return AE_OK; 991 } 992 993 #ifdef writeq 994 static inline void write64(u64 val, volatile void __iomem *addr) 995 { 996 writeq(val, addr); 997 } 998 #else 999 static inline void write64(u64 val, volatile void __iomem *addr) 1000 { 1001 writel(val, addr); 1002 writel(val>>32, addr+4); 1003 } 1004 #endif 1005 1006 acpi_status 1007 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 1008 { 1009 void __iomem *virt_addr; 1010 unsigned int size = width / 8; 1011 bool unmap = false; 1012 1013 rcu_read_lock(); 1014 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1015 if (!virt_addr) { 1016 rcu_read_unlock(); 1017 virt_addr = acpi_os_ioremap(phys_addr, size); 1018 if (!virt_addr) 1019 return AE_BAD_ADDRESS; 1020 unmap = true; 1021 } 1022 1023 switch (width) { 1024 case 8: 1025 writeb(value, virt_addr); 1026 break; 1027 case 16: 1028 writew(value, virt_addr); 1029 break; 1030 case 32: 1031 writel(value, virt_addr); 1032 break; 1033 case 64: 1034 write64(value, virt_addr); 1035 break; 1036 default: 1037 BUG(); 1038 } 1039 1040 if (unmap) 1041 iounmap(virt_addr); 1042 else 1043 rcu_read_unlock(); 1044 1045 return AE_OK; 1046 } 1047 1048 acpi_status 1049 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1050 u64 *value, u32 width) 1051 { 1052 int result, size; 1053 u32 value32; 1054 1055 if (!value) 1056 return AE_BAD_PARAMETER; 1057 1058 switch (width) { 1059 case 8: 1060 size = 1; 1061 break; 1062 case 16: 1063 size = 2; 1064 break; 1065 case 32: 1066 size = 4; 1067 break; 1068 default: 1069 return AE_ERROR; 1070 } 1071 1072 result = raw_pci_read(pci_id->segment, pci_id->bus, 1073 PCI_DEVFN(pci_id->device, pci_id->function), 1074 reg, size, &value32); 1075 *value = value32; 1076 1077 return (result ? AE_ERROR : AE_OK); 1078 } 1079 1080 acpi_status 1081 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1082 u64 value, u32 width) 1083 { 1084 int result, size; 1085 1086 switch (width) { 1087 case 8: 1088 size = 1; 1089 break; 1090 case 16: 1091 size = 2; 1092 break; 1093 case 32: 1094 size = 4; 1095 break; 1096 default: 1097 return AE_ERROR; 1098 } 1099 1100 result = raw_pci_write(pci_id->segment, pci_id->bus, 1101 PCI_DEVFN(pci_id->device, pci_id->function), 1102 reg, size, value); 1103 1104 return (result ? AE_ERROR : AE_OK); 1105 } 1106 1107 static void acpi_os_execute_deferred(struct work_struct *work) 1108 { 1109 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1110 1111 dpc->function(dpc->context); 1112 kfree(dpc); 1113 } 1114 1115 /******************************************************************************* 1116 * 1117 * FUNCTION: acpi_os_execute 1118 * 1119 * PARAMETERS: Type - Type of the callback 1120 * Function - Function to be executed 1121 * Context - Function parameters 1122 * 1123 * RETURN: Status 1124 * 1125 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1126 * immediately executes function on a separate thread. 1127 * 1128 ******************************************************************************/ 1129 1130 acpi_status acpi_os_execute(acpi_execute_type type, 1131 acpi_osd_exec_callback function, void *context) 1132 { 1133 acpi_status status = AE_OK; 1134 struct acpi_os_dpc *dpc; 1135 struct workqueue_struct *queue; 1136 int ret; 1137 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1138 "Scheduling function [%p(%p)] for deferred execution.\n", 1139 function, context)); 1140 1141 /* 1142 * Allocate/initialize DPC structure. Note that this memory will be 1143 * freed by the callee. The kernel handles the work_struct list in a 1144 * way that allows us to also free its memory inside the callee. 1145 * Because we may want to schedule several tasks with different 1146 * parameters we can't use the approach some kernel code uses of 1147 * having a static work_struct. 1148 */ 1149 1150 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1151 if (!dpc) 1152 return AE_NO_MEMORY; 1153 1154 dpc->function = function; 1155 dpc->context = context; 1156 1157 /* 1158 * To prevent lockdep from complaining unnecessarily, make sure that 1159 * there is a different static lockdep key for each workqueue by using 1160 * INIT_WORK() for each of them separately. 1161 */ 1162 if (type == OSL_NOTIFY_HANDLER) { 1163 queue = kacpi_notify_wq; 1164 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1165 } else { 1166 queue = kacpid_wq; 1167 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1168 } 1169 1170 /* 1171 * On some machines, a software-initiated SMI causes corruption unless 1172 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1173 * typically it's done in GPE-related methods that are run via 1174 * workqueues, so we can avoid the known corruption cases by always 1175 * queueing on CPU 0. 1176 */ 1177 ret = queue_work_on(0, queue, &dpc->work); 1178 1179 if (!ret) { 1180 printk(KERN_ERR PREFIX 1181 "Call to queue_work() failed.\n"); 1182 status = AE_ERROR; 1183 kfree(dpc); 1184 } 1185 return status; 1186 } 1187 EXPORT_SYMBOL(acpi_os_execute); 1188 1189 void acpi_os_wait_events_complete(void) 1190 { 1191 flush_workqueue(kacpid_wq); 1192 flush_workqueue(kacpi_notify_wq); 1193 } 1194 1195 struct acpi_hp_work { 1196 struct work_struct work; 1197 struct acpi_device *adev; 1198 u32 src; 1199 }; 1200 1201 static void acpi_hotplug_work_fn(struct work_struct *work) 1202 { 1203 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1204 1205 acpi_os_wait_events_complete(); 1206 acpi_device_hotplug(hpw->adev, hpw->src); 1207 kfree(hpw); 1208 } 1209 1210 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1211 { 1212 struct acpi_hp_work *hpw; 1213 1214 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1215 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1216 adev, src)); 1217 1218 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1219 if (!hpw) 1220 return AE_NO_MEMORY; 1221 1222 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1223 hpw->adev = adev; 1224 hpw->src = src; 1225 /* 1226 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1227 * the hotplug code may call driver .remove() functions, which may 1228 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1229 * these workqueues. 1230 */ 1231 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1232 kfree(hpw); 1233 return AE_ERROR; 1234 } 1235 return AE_OK; 1236 } 1237 1238 bool acpi_queue_hotplug_work(struct work_struct *work) 1239 { 1240 return queue_work(kacpi_hotplug_wq, work); 1241 } 1242 1243 acpi_status 1244 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1245 { 1246 struct semaphore *sem = NULL; 1247 1248 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1249 if (!sem) 1250 return AE_NO_MEMORY; 1251 1252 sema_init(sem, initial_units); 1253 1254 *handle = (acpi_handle *) sem; 1255 1256 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1257 *handle, initial_units)); 1258 1259 return AE_OK; 1260 } 1261 1262 /* 1263 * TODO: A better way to delete semaphores? Linux doesn't have a 1264 * 'delete_semaphore()' function -- may result in an invalid 1265 * pointer dereference for non-synchronized consumers. Should 1266 * we at least check for blocked threads and signal/cancel them? 1267 */ 1268 1269 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1270 { 1271 struct semaphore *sem = (struct semaphore *)handle; 1272 1273 if (!sem) 1274 return AE_BAD_PARAMETER; 1275 1276 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1277 1278 BUG_ON(!list_empty(&sem->wait_list)); 1279 kfree(sem); 1280 sem = NULL; 1281 1282 return AE_OK; 1283 } 1284 1285 /* 1286 * TODO: Support for units > 1? 1287 */ 1288 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1289 { 1290 acpi_status status = AE_OK; 1291 struct semaphore *sem = (struct semaphore *)handle; 1292 long jiffies; 1293 int ret = 0; 1294 1295 if (!sem || (units < 1)) 1296 return AE_BAD_PARAMETER; 1297 1298 if (units > 1) 1299 return AE_SUPPORT; 1300 1301 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1302 handle, units, timeout)); 1303 1304 if (timeout == ACPI_WAIT_FOREVER) 1305 jiffies = MAX_SCHEDULE_TIMEOUT; 1306 else 1307 jiffies = msecs_to_jiffies(timeout); 1308 1309 ret = down_timeout(sem, jiffies); 1310 if (ret) 1311 status = AE_TIME; 1312 1313 if (ACPI_FAILURE(status)) { 1314 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1315 "Failed to acquire semaphore[%p|%d|%d], %s", 1316 handle, units, timeout, 1317 acpi_format_exception(status))); 1318 } else { 1319 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1320 "Acquired semaphore[%p|%d|%d]", handle, 1321 units, timeout)); 1322 } 1323 1324 return status; 1325 } 1326 1327 /* 1328 * TODO: Support for units > 1? 1329 */ 1330 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1331 { 1332 struct semaphore *sem = (struct semaphore *)handle; 1333 1334 if (!sem || (units < 1)) 1335 return AE_BAD_PARAMETER; 1336 1337 if (units > 1) 1338 return AE_SUPPORT; 1339 1340 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1341 units)); 1342 1343 up(sem); 1344 1345 return AE_OK; 1346 } 1347 1348 #ifdef ACPI_FUTURE_USAGE 1349 u32 acpi_os_get_line(char *buffer) 1350 { 1351 1352 #ifdef ENABLE_DEBUGGER 1353 if (acpi_in_debugger) { 1354 u32 chars; 1355 1356 kdb_read(buffer, sizeof(line_buf)); 1357 1358 /* remove the CR kdb includes */ 1359 chars = strlen(buffer) - 1; 1360 buffer[chars] = '\0'; 1361 } 1362 #endif 1363 1364 return 0; 1365 } 1366 #endif /* ACPI_FUTURE_USAGE */ 1367 1368 acpi_status acpi_os_signal(u32 function, void *info) 1369 { 1370 switch (function) { 1371 case ACPI_SIGNAL_FATAL: 1372 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1373 break; 1374 case ACPI_SIGNAL_BREAKPOINT: 1375 /* 1376 * AML Breakpoint 1377 * ACPI spec. says to treat it as a NOP unless 1378 * you are debugging. So if/when we integrate 1379 * AML debugger into the kernel debugger its 1380 * hook will go here. But until then it is 1381 * not useful to print anything on breakpoints. 1382 */ 1383 break; 1384 default: 1385 break; 1386 } 1387 1388 return AE_OK; 1389 } 1390 1391 static int __init acpi_os_name_setup(char *str) 1392 { 1393 char *p = acpi_os_name; 1394 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1395 1396 if (!str || !*str) 1397 return 0; 1398 1399 for (; count-- && *str; str++) { 1400 if (isalnum(*str) || *str == ' ' || *str == ':') 1401 *p++ = *str; 1402 else if (*str == '\'' || *str == '"') 1403 continue; 1404 else 1405 break; 1406 } 1407 *p = 0; 1408 1409 return 1; 1410 1411 } 1412 1413 __setup("acpi_os_name=", acpi_os_name_setup); 1414 1415 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1416 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1417 1418 struct osi_setup_entry { 1419 char string[OSI_STRING_LENGTH_MAX]; 1420 bool enable; 1421 }; 1422 1423 static struct osi_setup_entry 1424 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1425 {"Module Device", true}, 1426 {"Processor Device", true}, 1427 {"3.0 _SCP Extensions", true}, 1428 {"Processor Aggregator Device", true}, 1429 }; 1430 1431 void __init acpi_osi_setup(char *str) 1432 { 1433 struct osi_setup_entry *osi; 1434 bool enable = true; 1435 int i; 1436 1437 if (!acpi_gbl_create_osi_method) 1438 return; 1439 1440 if (str == NULL || *str == '\0') { 1441 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1442 acpi_gbl_create_osi_method = FALSE; 1443 return; 1444 } 1445 1446 if (*str == '!') { 1447 str++; 1448 if (*str == '\0') { 1449 osi_linux.default_disabling = 1; 1450 return; 1451 } else if (*str == '*') { 1452 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1453 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1454 osi = &osi_setup_entries[i]; 1455 osi->enable = false; 1456 } 1457 return; 1458 } 1459 enable = false; 1460 } 1461 1462 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1463 osi = &osi_setup_entries[i]; 1464 if (!strcmp(osi->string, str)) { 1465 osi->enable = enable; 1466 break; 1467 } else if (osi->string[0] == '\0') { 1468 osi->enable = enable; 1469 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1470 break; 1471 } 1472 } 1473 } 1474 1475 static void __init set_osi_linux(unsigned int enable) 1476 { 1477 if (osi_linux.enable != enable) 1478 osi_linux.enable = enable; 1479 1480 if (osi_linux.enable) 1481 acpi_osi_setup("Linux"); 1482 else 1483 acpi_osi_setup("!Linux"); 1484 1485 return; 1486 } 1487 1488 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1489 { 1490 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1491 osi_linux.dmi = 0; 1492 set_osi_linux(enable); 1493 1494 return; 1495 } 1496 1497 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1498 { 1499 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1500 1501 if (enable == -1) 1502 return; 1503 1504 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1505 set_osi_linux(enable); 1506 1507 return; 1508 } 1509 1510 /* 1511 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1512 * 1513 * empty string disables _OSI 1514 * string starting with '!' disables that string 1515 * otherwise string is added to list, augmenting built-in strings 1516 */ 1517 static void __init acpi_osi_setup_late(void) 1518 { 1519 struct osi_setup_entry *osi; 1520 char *str; 1521 int i; 1522 acpi_status status; 1523 1524 if (osi_linux.default_disabling) { 1525 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1526 1527 if (ACPI_SUCCESS(status)) 1528 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1529 } 1530 1531 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1532 osi = &osi_setup_entries[i]; 1533 str = osi->string; 1534 1535 if (*str == '\0') 1536 break; 1537 if (osi->enable) { 1538 status = acpi_install_interface(str); 1539 1540 if (ACPI_SUCCESS(status)) 1541 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1542 } else { 1543 status = acpi_remove_interface(str); 1544 1545 if (ACPI_SUCCESS(status)) 1546 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1547 } 1548 } 1549 } 1550 1551 static int __init osi_setup(char *str) 1552 { 1553 if (str && !strcmp("Linux", str)) 1554 acpi_cmdline_osi_linux(1); 1555 else if (str && !strcmp("!Linux", str)) 1556 acpi_cmdline_osi_linux(0); 1557 else 1558 acpi_osi_setup(str); 1559 1560 return 1; 1561 } 1562 1563 __setup("acpi_osi=", osi_setup); 1564 1565 /* 1566 * Disable the auto-serialization of named objects creation methods. 1567 * 1568 * This feature is enabled by default. It marks the AML control methods 1569 * that contain the opcodes to create named objects as "Serialized". 1570 */ 1571 static int __init acpi_no_auto_serialize_setup(char *str) 1572 { 1573 acpi_gbl_auto_serialize_methods = FALSE; 1574 pr_info("ACPI: auto-serialization disabled\n"); 1575 1576 return 1; 1577 } 1578 1579 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1580 1581 /* Check of resource interference between native drivers and ACPI 1582 * OperationRegions (SystemIO and System Memory only). 1583 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1584 * in arbitrary AML code and can interfere with legacy drivers. 1585 * acpi_enforce_resources= can be set to: 1586 * 1587 * - strict (default) (2) 1588 * -> further driver trying to access the resources will not load 1589 * - lax (1) 1590 * -> further driver trying to access the resources will load, but you 1591 * get a system message that something might go wrong... 1592 * 1593 * - no (0) 1594 * -> ACPI Operation Region resources will not be registered 1595 * 1596 */ 1597 #define ENFORCE_RESOURCES_STRICT 2 1598 #define ENFORCE_RESOURCES_LAX 1 1599 #define ENFORCE_RESOURCES_NO 0 1600 1601 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1602 1603 static int __init acpi_enforce_resources_setup(char *str) 1604 { 1605 if (str == NULL || *str == '\0') 1606 return 0; 1607 1608 if (!strcmp("strict", str)) 1609 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1610 else if (!strcmp("lax", str)) 1611 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1612 else if (!strcmp("no", str)) 1613 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1614 1615 return 1; 1616 } 1617 1618 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1619 1620 /* Check for resource conflicts between ACPI OperationRegions and native 1621 * drivers */ 1622 int acpi_check_resource_conflict(const struct resource *res) 1623 { 1624 acpi_adr_space_type space_id; 1625 acpi_size length; 1626 u8 warn = 0; 1627 int clash = 0; 1628 1629 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1630 return 0; 1631 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1632 return 0; 1633 1634 if (res->flags & IORESOURCE_IO) 1635 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1636 else 1637 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1638 1639 length = resource_size(res); 1640 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1641 warn = 1; 1642 clash = acpi_check_address_range(space_id, res->start, length, warn); 1643 1644 if (clash) { 1645 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1646 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1647 printk(KERN_NOTICE "ACPI: This conflict may" 1648 " cause random problems and system" 1649 " instability\n"); 1650 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1651 " for this device, you should use it instead of" 1652 " the native driver\n"); 1653 } 1654 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1655 return -EBUSY; 1656 } 1657 return 0; 1658 } 1659 EXPORT_SYMBOL(acpi_check_resource_conflict); 1660 1661 int acpi_check_region(resource_size_t start, resource_size_t n, 1662 const char *name) 1663 { 1664 struct resource res = { 1665 .start = start, 1666 .end = start + n - 1, 1667 .name = name, 1668 .flags = IORESOURCE_IO, 1669 }; 1670 1671 return acpi_check_resource_conflict(&res); 1672 } 1673 EXPORT_SYMBOL(acpi_check_region); 1674 1675 /* 1676 * Let drivers know whether the resource checks are effective 1677 */ 1678 int acpi_resources_are_enforced(void) 1679 { 1680 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1681 } 1682 EXPORT_SYMBOL(acpi_resources_are_enforced); 1683 1684 /* 1685 * Deallocate the memory for a spinlock. 1686 */ 1687 void acpi_os_delete_lock(acpi_spinlock handle) 1688 { 1689 ACPI_FREE(handle); 1690 } 1691 1692 /* 1693 * Acquire a spinlock. 1694 * 1695 * handle is a pointer to the spinlock_t. 1696 */ 1697 1698 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1699 { 1700 acpi_cpu_flags flags; 1701 spin_lock_irqsave(lockp, flags); 1702 return flags; 1703 } 1704 1705 /* 1706 * Release a spinlock. See above. 1707 */ 1708 1709 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1710 { 1711 spin_unlock_irqrestore(lockp, flags); 1712 } 1713 1714 #ifndef ACPI_USE_LOCAL_CACHE 1715 1716 /******************************************************************************* 1717 * 1718 * FUNCTION: acpi_os_create_cache 1719 * 1720 * PARAMETERS: name - Ascii name for the cache 1721 * size - Size of each cached object 1722 * depth - Maximum depth of the cache (in objects) <ignored> 1723 * cache - Where the new cache object is returned 1724 * 1725 * RETURN: status 1726 * 1727 * DESCRIPTION: Create a cache object 1728 * 1729 ******************************************************************************/ 1730 1731 acpi_status 1732 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1733 { 1734 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1735 if (*cache == NULL) 1736 return AE_ERROR; 1737 else 1738 return AE_OK; 1739 } 1740 1741 /******************************************************************************* 1742 * 1743 * FUNCTION: acpi_os_purge_cache 1744 * 1745 * PARAMETERS: Cache - Handle to cache object 1746 * 1747 * RETURN: Status 1748 * 1749 * DESCRIPTION: Free all objects within the requested cache. 1750 * 1751 ******************************************************************************/ 1752 1753 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1754 { 1755 kmem_cache_shrink(cache); 1756 return (AE_OK); 1757 } 1758 1759 /******************************************************************************* 1760 * 1761 * FUNCTION: acpi_os_delete_cache 1762 * 1763 * PARAMETERS: Cache - Handle to cache object 1764 * 1765 * RETURN: Status 1766 * 1767 * DESCRIPTION: Free all objects within the requested cache and delete the 1768 * cache object. 1769 * 1770 ******************************************************************************/ 1771 1772 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1773 { 1774 kmem_cache_destroy(cache); 1775 return (AE_OK); 1776 } 1777 1778 /******************************************************************************* 1779 * 1780 * FUNCTION: acpi_os_release_object 1781 * 1782 * PARAMETERS: Cache - Handle to cache object 1783 * Object - The object to be released 1784 * 1785 * RETURN: None 1786 * 1787 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1788 * the object is deleted. 1789 * 1790 ******************************************************************************/ 1791 1792 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1793 { 1794 kmem_cache_free(cache, object); 1795 return (AE_OK); 1796 } 1797 #endif 1798 1799 static int __init acpi_no_static_ssdt_setup(char *s) 1800 { 1801 acpi_gbl_disable_ssdt_table_install = TRUE; 1802 pr_info("ACPI: static SSDT installation disabled\n"); 1803 1804 return 0; 1805 } 1806 1807 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1808 1809 static int __init acpi_disable_return_repair(char *s) 1810 { 1811 printk(KERN_NOTICE PREFIX 1812 "ACPI: Predefined validation mechanism disabled\n"); 1813 acpi_gbl_disable_auto_repair = TRUE; 1814 1815 return 1; 1816 } 1817 1818 __setup("acpica_no_return_repair", acpi_disable_return_repair); 1819 1820 acpi_status __init acpi_os_initialize(void) 1821 { 1822 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1823 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1824 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1825 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1826 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1827 /* 1828 * Use acpi_os_map_generic_address to pre-map the reset 1829 * register if it's in system memory. 1830 */ 1831 int rv; 1832 1833 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1834 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1835 } 1836 1837 return AE_OK; 1838 } 1839 1840 acpi_status __init acpi_os_initialize1(void) 1841 { 1842 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1843 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1844 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1845 BUG_ON(!kacpid_wq); 1846 BUG_ON(!kacpi_notify_wq); 1847 BUG_ON(!kacpi_hotplug_wq); 1848 acpi_install_interface_handler(acpi_osi_handler); 1849 acpi_osi_setup_late(); 1850 return AE_OK; 1851 } 1852 1853 acpi_status acpi_os_terminate(void) 1854 { 1855 if (acpi_irq_handler) { 1856 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1857 acpi_irq_handler); 1858 } 1859 1860 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1861 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1862 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1863 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1864 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1865 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1866 1867 destroy_workqueue(kacpid_wq); 1868 destroy_workqueue(kacpi_notify_wq); 1869 destroy_workqueue(kacpi_hotplug_wq); 1870 1871 return AE_OK; 1872 } 1873 1874 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1875 u32 pm1b_control) 1876 { 1877 int rc = 0; 1878 if (__acpi_os_prepare_sleep) 1879 rc = __acpi_os_prepare_sleep(sleep_state, 1880 pm1a_control, pm1b_control); 1881 if (rc < 0) 1882 return AE_ERROR; 1883 else if (rc > 0) 1884 return AE_CTRL_SKIP; 1885 1886 return AE_OK; 1887 } 1888 1889 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1890 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1891 { 1892 __acpi_os_prepare_sleep = func; 1893 } 1894 1895 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1896 u32 val_b) 1897 { 1898 int rc = 0; 1899 if (__acpi_os_prepare_extended_sleep) 1900 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1901 val_a, val_b); 1902 if (rc < 0) 1903 return AE_ERROR; 1904 else if (rc > 0) 1905 return AE_CTRL_SKIP; 1906 1907 return AE_OK; 1908 } 1909 1910 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1911 u32 val_a, u32 val_b)) 1912 { 1913 __acpi_os_prepare_extended_sleep = func; 1914 } 1915