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 void __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 } 215 216 void acpi_os_printf(const char *fmt, ...) 217 { 218 va_list args; 219 va_start(args, fmt); 220 acpi_os_vprintf(fmt, args); 221 va_end(args); 222 } 223 224 void acpi_os_vprintf(const char *fmt, va_list args) 225 { 226 static char buffer[512]; 227 228 vsprintf(buffer, fmt, args); 229 230 #ifdef ENABLE_DEBUGGER 231 if (acpi_in_debugger) { 232 kdb_printf("%s", buffer); 233 } else { 234 printk(KERN_CONT "%s", buffer); 235 } 236 #else 237 printk(KERN_CONT "%s", buffer); 238 #endif 239 } 240 241 #ifdef CONFIG_KEXEC 242 static unsigned long acpi_rsdp; 243 static int __init setup_acpi_rsdp(char *arg) 244 { 245 if (kstrtoul(arg, 16, &acpi_rsdp)) 246 return -EINVAL; 247 return 0; 248 } 249 early_param("acpi_rsdp", setup_acpi_rsdp); 250 #endif 251 252 acpi_physical_address __init acpi_os_get_root_pointer(void) 253 { 254 #ifdef CONFIG_KEXEC 255 if (acpi_rsdp) 256 return acpi_rsdp; 257 #endif 258 259 if (efi_enabled(EFI_CONFIG_TABLES)) { 260 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 261 return efi.acpi20; 262 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 263 return efi.acpi; 264 else { 265 printk(KERN_ERR PREFIX 266 "System description tables not found\n"); 267 return 0; 268 } 269 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) { 270 acpi_physical_address pa = 0; 271 272 acpi_find_root_pointer(&pa); 273 return pa; 274 } 275 276 return 0; 277 } 278 279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 280 static struct acpi_ioremap * 281 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 282 { 283 struct acpi_ioremap *map; 284 285 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 286 if (map->phys <= phys && 287 phys + size <= map->phys + map->size) 288 return map; 289 290 return NULL; 291 } 292 293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 294 static void __iomem * 295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 296 { 297 struct acpi_ioremap *map; 298 299 map = acpi_map_lookup(phys, size); 300 if (map) 301 return map->virt + (phys - map->phys); 302 303 return NULL; 304 } 305 306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 307 { 308 struct acpi_ioremap *map; 309 void __iomem *virt = NULL; 310 311 mutex_lock(&acpi_ioremap_lock); 312 map = acpi_map_lookup(phys, size); 313 if (map) { 314 virt = map->virt + (phys - map->phys); 315 map->refcount++; 316 } 317 mutex_unlock(&acpi_ioremap_lock); 318 return virt; 319 } 320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 321 322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 323 static struct acpi_ioremap * 324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 325 { 326 struct acpi_ioremap *map; 327 328 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 329 if (map->virt <= virt && 330 virt + size <= map->virt + map->size) 331 return map; 332 333 return NULL; 334 } 335 336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64) 337 /* ioremap will take care of cache attributes */ 338 #define should_use_kmap(pfn) 0 339 #else 340 #define should_use_kmap(pfn) page_is_ram(pfn) 341 #endif 342 343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 344 { 345 unsigned long pfn; 346 347 pfn = pg_off >> PAGE_SHIFT; 348 if (should_use_kmap(pfn)) { 349 if (pg_sz > PAGE_SIZE) 350 return NULL; 351 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 352 } else 353 return acpi_os_ioremap(pg_off, pg_sz); 354 } 355 356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 357 { 358 unsigned long pfn; 359 360 pfn = pg_off >> PAGE_SHIFT; 361 if (should_use_kmap(pfn)) 362 kunmap(pfn_to_page(pfn)); 363 else 364 iounmap(vaddr); 365 } 366 367 void __iomem *__init_refok 368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size) 369 { 370 struct acpi_ioremap *map; 371 void __iomem *virt; 372 acpi_physical_address pg_off; 373 acpi_size pg_sz; 374 375 if (phys > ULONG_MAX) { 376 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 377 return NULL; 378 } 379 380 if (!acpi_gbl_permanent_mmap) 381 return __acpi_map_table((unsigned long)phys, size); 382 383 mutex_lock(&acpi_ioremap_lock); 384 /* Check if there's a suitable mapping already. */ 385 map = acpi_map_lookup(phys, size); 386 if (map) { 387 map->refcount++; 388 goto out; 389 } 390 391 map = kzalloc(sizeof(*map), GFP_KERNEL); 392 if (!map) { 393 mutex_unlock(&acpi_ioremap_lock); 394 return NULL; 395 } 396 397 pg_off = round_down(phys, PAGE_SIZE); 398 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 399 virt = acpi_map(pg_off, pg_sz); 400 if (!virt) { 401 mutex_unlock(&acpi_ioremap_lock); 402 kfree(map); 403 return NULL; 404 } 405 406 INIT_LIST_HEAD(&map->list); 407 map->virt = virt; 408 map->phys = pg_off; 409 map->size = pg_sz; 410 map->refcount = 1; 411 412 list_add_tail_rcu(&map->list, &acpi_ioremaps); 413 414 out: 415 mutex_unlock(&acpi_ioremap_lock); 416 return map->virt + (phys - map->phys); 417 } 418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem); 419 420 void *__init_refok 421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 422 { 423 return (void *)acpi_os_map_iomem(phys, size); 424 } 425 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 426 427 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 428 { 429 if (!--map->refcount) 430 list_del_rcu(&map->list); 431 } 432 433 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 434 { 435 if (!map->refcount) { 436 synchronize_rcu_expedited(); 437 acpi_unmap(map->phys, map->virt); 438 kfree(map); 439 } 440 } 441 442 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) 443 { 444 struct acpi_ioremap *map; 445 446 if (!acpi_gbl_permanent_mmap) { 447 __acpi_unmap_table(virt, size); 448 return; 449 } 450 451 mutex_lock(&acpi_ioremap_lock); 452 map = acpi_map_lookup_virt(virt, size); 453 if (!map) { 454 mutex_unlock(&acpi_ioremap_lock); 455 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 456 return; 457 } 458 acpi_os_drop_map_ref(map); 459 mutex_unlock(&acpi_ioremap_lock); 460 461 acpi_os_map_cleanup(map); 462 } 463 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem); 464 465 void __ref acpi_os_unmap_memory(void *virt, acpi_size size) 466 { 467 return acpi_os_unmap_iomem((void __iomem *)virt, size); 468 } 469 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 470 471 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 472 { 473 if (!acpi_gbl_permanent_mmap) 474 __acpi_unmap_table(virt, size); 475 } 476 477 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 478 { 479 u64 addr; 480 void __iomem *virt; 481 482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 483 return 0; 484 485 /* Handle possible alignment issues */ 486 memcpy(&addr, &gas->address, sizeof(addr)); 487 if (!addr || !gas->bit_width) 488 return -EINVAL; 489 490 virt = acpi_os_map_iomem(addr, gas->bit_width / 8); 491 if (!virt) 492 return -EIO; 493 494 return 0; 495 } 496 EXPORT_SYMBOL(acpi_os_map_generic_address); 497 498 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 499 { 500 u64 addr; 501 struct acpi_ioremap *map; 502 503 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 504 return; 505 506 /* Handle possible alignment issues */ 507 memcpy(&addr, &gas->address, sizeof(addr)); 508 if (!addr || !gas->bit_width) 509 return; 510 511 mutex_lock(&acpi_ioremap_lock); 512 map = acpi_map_lookup(addr, gas->bit_width / 8); 513 if (!map) { 514 mutex_unlock(&acpi_ioremap_lock); 515 return; 516 } 517 acpi_os_drop_map_ref(map); 518 mutex_unlock(&acpi_ioremap_lock); 519 520 acpi_os_map_cleanup(map); 521 } 522 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 523 524 #ifdef ACPI_FUTURE_USAGE 525 acpi_status 526 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 527 { 528 if (!phys || !virt) 529 return AE_BAD_PARAMETER; 530 531 *phys = virt_to_phys(virt); 532 533 return AE_OK; 534 } 535 #endif 536 537 #define ACPI_MAX_OVERRIDE_LEN 100 538 539 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 540 541 acpi_status 542 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 543 acpi_string * new_val) 544 { 545 if (!init_val || !new_val) 546 return AE_BAD_PARAMETER; 547 548 *new_val = NULL; 549 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 550 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 551 acpi_os_name); 552 *new_val = acpi_os_name; 553 } 554 555 return AE_OK; 556 } 557 558 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 559 #include <linux/earlycpio.h> 560 #include <linux/memblock.h> 561 562 static u64 acpi_tables_addr; 563 static int all_tables_size; 564 565 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 566 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 567 { 568 u8 sum = 0; 569 u8 *end = buffer + length; 570 571 while (buffer < end) 572 sum = (u8) (sum + *(buffer++)); 573 return sum; 574 } 575 576 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 577 static const char * const table_sigs[] = { 578 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 579 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 580 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 581 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 582 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 583 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 584 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 585 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 586 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 587 588 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 589 590 #define ACPI_OVERRIDE_TABLES 64 591 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 592 593 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 594 595 void __init acpi_initrd_override(void *data, size_t size) 596 { 597 int sig, no, table_nr = 0, total_offset = 0; 598 long offset = 0; 599 struct acpi_table_header *table; 600 char cpio_path[32] = "kernel/firmware/acpi/"; 601 struct cpio_data file; 602 603 if (data == NULL || size == 0) 604 return; 605 606 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 607 file = find_cpio_data(cpio_path, data, size, &offset); 608 if (!file.data) 609 break; 610 611 data += offset; 612 size -= offset; 613 614 if (file.size < sizeof(struct acpi_table_header)) { 615 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 616 cpio_path, file.name); 617 continue; 618 } 619 620 table = file.data; 621 622 for (sig = 0; table_sigs[sig]; sig++) 623 if (!memcmp(table->signature, table_sigs[sig], 4)) 624 break; 625 626 if (!table_sigs[sig]) { 627 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 628 cpio_path, file.name); 629 continue; 630 } 631 if (file.size != table->length) { 632 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 633 cpio_path, file.name); 634 continue; 635 } 636 if (acpi_table_checksum(file.data, table->length)) { 637 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 638 cpio_path, file.name); 639 continue; 640 } 641 642 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 643 table->signature, cpio_path, file.name, table->length); 644 645 all_tables_size += table->length; 646 acpi_initrd_files[table_nr].data = file.data; 647 acpi_initrd_files[table_nr].size = file.size; 648 table_nr++; 649 } 650 if (table_nr == 0) 651 return; 652 653 acpi_tables_addr = 654 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 655 all_tables_size, PAGE_SIZE); 656 if (!acpi_tables_addr) { 657 WARN_ON(1); 658 return; 659 } 660 /* 661 * Only calling e820_add_reserve does not work and the 662 * tables are invalid (memory got used) later. 663 * memblock_reserve works as expected and the tables won't get modified. 664 * But it's not enough on X86 because ioremap will 665 * complain later (used by acpi_os_map_memory) that the pages 666 * that should get mapped are not marked "reserved". 667 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 668 * works fine. 669 */ 670 memblock_reserve(acpi_tables_addr, all_tables_size); 671 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 672 673 /* 674 * early_ioremap only can remap 256k one time. If we map all 675 * tables one time, we will hit the limit. Need to map chunks 676 * one by one during copying the same as that in relocate_initrd(). 677 */ 678 for (no = 0; no < table_nr; no++) { 679 unsigned char *src_p = acpi_initrd_files[no].data; 680 phys_addr_t size = acpi_initrd_files[no].size; 681 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 682 phys_addr_t slop, clen; 683 char *dest_p; 684 685 total_offset += size; 686 687 while (size) { 688 slop = dest_addr & ~PAGE_MASK; 689 clen = size; 690 if (clen > MAP_CHUNK_SIZE - slop) 691 clen = MAP_CHUNK_SIZE - slop; 692 dest_p = early_ioremap(dest_addr & PAGE_MASK, 693 clen + slop); 694 memcpy(dest_p + slop, src_p, clen); 695 early_iounmap(dest_p, clen + slop); 696 src_p += clen; 697 dest_addr += clen; 698 size -= clen; 699 } 700 } 701 } 702 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 703 704 static void acpi_table_taint(struct acpi_table_header *table) 705 { 706 pr_warn(PREFIX 707 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 708 table->signature, table->oem_table_id); 709 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 710 } 711 712 713 acpi_status 714 acpi_os_table_override(struct acpi_table_header * existing_table, 715 struct acpi_table_header ** new_table) 716 { 717 if (!existing_table || !new_table) 718 return AE_BAD_PARAMETER; 719 720 *new_table = NULL; 721 722 #ifdef CONFIG_ACPI_CUSTOM_DSDT 723 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 724 *new_table = (struct acpi_table_header *)AmlCode; 725 #endif 726 if (*new_table != NULL) 727 acpi_table_taint(existing_table); 728 return AE_OK; 729 } 730 731 acpi_status 732 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 733 acpi_physical_address *address, 734 u32 *table_length) 735 { 736 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 737 *table_length = 0; 738 *address = 0; 739 return AE_OK; 740 #else 741 int table_offset = 0; 742 struct acpi_table_header *table; 743 744 *table_length = 0; 745 *address = 0; 746 747 if (!acpi_tables_addr) 748 return AE_OK; 749 750 do { 751 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 752 WARN_ON(1); 753 return AE_OK; 754 } 755 756 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 757 ACPI_HEADER_SIZE); 758 759 if (table_offset + table->length > all_tables_size) { 760 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 761 WARN_ON(1); 762 return AE_OK; 763 } 764 765 table_offset += table->length; 766 767 if (memcmp(existing_table->signature, table->signature, 4)) { 768 acpi_os_unmap_memory(table, 769 ACPI_HEADER_SIZE); 770 continue; 771 } 772 773 /* Only override tables with matching oem id */ 774 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 775 ACPI_OEM_TABLE_ID_SIZE)) { 776 acpi_os_unmap_memory(table, 777 ACPI_HEADER_SIZE); 778 continue; 779 } 780 781 table_offset -= table->length; 782 *table_length = table->length; 783 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 784 *address = acpi_tables_addr + table_offset; 785 break; 786 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 787 788 if (*address != 0) 789 acpi_table_taint(existing_table); 790 return AE_OK; 791 #endif 792 } 793 794 static irqreturn_t acpi_irq(int irq, void *dev_id) 795 { 796 u32 handled; 797 798 handled = (*acpi_irq_handler) (acpi_irq_context); 799 800 if (handled) { 801 acpi_irq_handled++; 802 return IRQ_HANDLED; 803 } else { 804 acpi_irq_not_handled++; 805 return IRQ_NONE; 806 } 807 } 808 809 acpi_status 810 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 811 void *context) 812 { 813 unsigned int irq; 814 815 acpi_irq_stats_init(); 816 817 /* 818 * ACPI interrupts different from the SCI in our copy of the FADT are 819 * not supported. 820 */ 821 if (gsi != acpi_gbl_FADT.sci_interrupt) 822 return AE_BAD_PARAMETER; 823 824 if (acpi_irq_handler) 825 return AE_ALREADY_ACQUIRED; 826 827 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 828 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 829 gsi); 830 return AE_OK; 831 } 832 833 acpi_irq_handler = handler; 834 acpi_irq_context = context; 835 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 836 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 837 acpi_irq_handler = NULL; 838 return AE_NOT_ACQUIRED; 839 } 840 841 return AE_OK; 842 } 843 844 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 845 { 846 if (irq != acpi_gbl_FADT.sci_interrupt) 847 return AE_BAD_PARAMETER; 848 849 free_irq(irq, acpi_irq); 850 acpi_irq_handler = NULL; 851 852 return AE_OK; 853 } 854 855 /* 856 * Running in interpreter thread context, safe to sleep 857 */ 858 859 void acpi_os_sleep(u64 ms) 860 { 861 msleep(ms); 862 } 863 864 void acpi_os_stall(u32 us) 865 { 866 while (us) { 867 u32 delay = 1000; 868 869 if (delay > us) 870 delay = us; 871 udelay(delay); 872 touch_nmi_watchdog(); 873 us -= delay; 874 } 875 } 876 877 /* 878 * Support ACPI 3.0 AML Timer operand 879 * Returns 64-bit free-running, monotonically increasing timer 880 * with 100ns granularity 881 */ 882 u64 acpi_os_get_timer(void) 883 { 884 u64 time_ns = ktime_to_ns(ktime_get()); 885 do_div(time_ns, 100); 886 return time_ns; 887 } 888 889 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 890 { 891 u32 dummy; 892 893 if (!value) 894 value = &dummy; 895 896 *value = 0; 897 if (width <= 8) { 898 *(u8 *) value = inb(port); 899 } else if (width <= 16) { 900 *(u16 *) value = inw(port); 901 } else if (width <= 32) { 902 *(u32 *) value = inl(port); 903 } else { 904 BUG(); 905 } 906 907 return AE_OK; 908 } 909 910 EXPORT_SYMBOL(acpi_os_read_port); 911 912 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 913 { 914 if (width <= 8) { 915 outb(value, port); 916 } else if (width <= 16) { 917 outw(value, port); 918 } else if (width <= 32) { 919 outl(value, port); 920 } else { 921 BUG(); 922 } 923 924 return AE_OK; 925 } 926 927 EXPORT_SYMBOL(acpi_os_write_port); 928 929 #ifdef readq 930 static inline u64 read64(const volatile void __iomem *addr) 931 { 932 return readq(addr); 933 } 934 #else 935 static inline u64 read64(const volatile void __iomem *addr) 936 { 937 u64 l, h; 938 l = readl(addr); 939 h = readl(addr+4); 940 return l | (h << 32); 941 } 942 #endif 943 944 acpi_status 945 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 946 { 947 void __iomem *virt_addr; 948 unsigned int size = width / 8; 949 bool unmap = false; 950 u64 dummy; 951 952 rcu_read_lock(); 953 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 954 if (!virt_addr) { 955 rcu_read_unlock(); 956 virt_addr = acpi_os_ioremap(phys_addr, size); 957 if (!virt_addr) 958 return AE_BAD_ADDRESS; 959 unmap = true; 960 } 961 962 if (!value) 963 value = &dummy; 964 965 switch (width) { 966 case 8: 967 *(u8 *) value = readb(virt_addr); 968 break; 969 case 16: 970 *(u16 *) value = readw(virt_addr); 971 break; 972 case 32: 973 *(u32 *) value = readl(virt_addr); 974 break; 975 case 64: 976 *(u64 *) value = read64(virt_addr); 977 break; 978 default: 979 BUG(); 980 } 981 982 if (unmap) 983 iounmap(virt_addr); 984 else 985 rcu_read_unlock(); 986 987 return AE_OK; 988 } 989 990 #ifdef writeq 991 static inline void write64(u64 val, volatile void __iomem *addr) 992 { 993 writeq(val, addr); 994 } 995 #else 996 static inline void write64(u64 val, volatile void __iomem *addr) 997 { 998 writel(val, addr); 999 writel(val>>32, addr+4); 1000 } 1001 #endif 1002 1003 acpi_status 1004 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 1005 { 1006 void __iomem *virt_addr; 1007 unsigned int size = width / 8; 1008 bool unmap = false; 1009 1010 rcu_read_lock(); 1011 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1012 if (!virt_addr) { 1013 rcu_read_unlock(); 1014 virt_addr = acpi_os_ioremap(phys_addr, size); 1015 if (!virt_addr) 1016 return AE_BAD_ADDRESS; 1017 unmap = true; 1018 } 1019 1020 switch (width) { 1021 case 8: 1022 writeb(value, virt_addr); 1023 break; 1024 case 16: 1025 writew(value, virt_addr); 1026 break; 1027 case 32: 1028 writel(value, virt_addr); 1029 break; 1030 case 64: 1031 write64(value, virt_addr); 1032 break; 1033 default: 1034 BUG(); 1035 } 1036 1037 if (unmap) 1038 iounmap(virt_addr); 1039 else 1040 rcu_read_unlock(); 1041 1042 return AE_OK; 1043 } 1044 1045 acpi_status 1046 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1047 u64 *value, u32 width) 1048 { 1049 int result, size; 1050 u32 value32; 1051 1052 if (!value) 1053 return AE_BAD_PARAMETER; 1054 1055 switch (width) { 1056 case 8: 1057 size = 1; 1058 break; 1059 case 16: 1060 size = 2; 1061 break; 1062 case 32: 1063 size = 4; 1064 break; 1065 default: 1066 return AE_ERROR; 1067 } 1068 1069 result = raw_pci_read(pci_id->segment, pci_id->bus, 1070 PCI_DEVFN(pci_id->device, pci_id->function), 1071 reg, size, &value32); 1072 *value = value32; 1073 1074 return (result ? AE_ERROR : AE_OK); 1075 } 1076 1077 acpi_status 1078 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1079 u64 value, u32 width) 1080 { 1081 int result, size; 1082 1083 switch (width) { 1084 case 8: 1085 size = 1; 1086 break; 1087 case 16: 1088 size = 2; 1089 break; 1090 case 32: 1091 size = 4; 1092 break; 1093 default: 1094 return AE_ERROR; 1095 } 1096 1097 result = raw_pci_write(pci_id->segment, pci_id->bus, 1098 PCI_DEVFN(pci_id->device, pci_id->function), 1099 reg, size, value); 1100 1101 return (result ? AE_ERROR : AE_OK); 1102 } 1103 1104 static void acpi_os_execute_deferred(struct work_struct *work) 1105 { 1106 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1107 1108 dpc->function(dpc->context); 1109 kfree(dpc); 1110 } 1111 1112 /******************************************************************************* 1113 * 1114 * FUNCTION: acpi_os_execute 1115 * 1116 * PARAMETERS: Type - Type of the callback 1117 * Function - Function to be executed 1118 * Context - Function parameters 1119 * 1120 * RETURN: Status 1121 * 1122 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1123 * immediately executes function on a separate thread. 1124 * 1125 ******************************************************************************/ 1126 1127 acpi_status acpi_os_execute(acpi_execute_type type, 1128 acpi_osd_exec_callback function, void *context) 1129 { 1130 acpi_status status = AE_OK; 1131 struct acpi_os_dpc *dpc; 1132 struct workqueue_struct *queue; 1133 int ret; 1134 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1135 "Scheduling function [%p(%p)] for deferred execution.\n", 1136 function, context)); 1137 1138 /* 1139 * Allocate/initialize DPC structure. Note that this memory will be 1140 * freed by the callee. The kernel handles the work_struct list in a 1141 * way that allows us to also free its memory inside the callee. 1142 * Because we may want to schedule several tasks with different 1143 * parameters we can't use the approach some kernel code uses of 1144 * having a static work_struct. 1145 */ 1146 1147 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1148 if (!dpc) 1149 return AE_NO_MEMORY; 1150 1151 dpc->function = function; 1152 dpc->context = context; 1153 1154 /* 1155 * To prevent lockdep from complaining unnecessarily, make sure that 1156 * there is a different static lockdep key for each workqueue by using 1157 * INIT_WORK() for each of them separately. 1158 */ 1159 if (type == OSL_NOTIFY_HANDLER) { 1160 queue = kacpi_notify_wq; 1161 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1162 } else { 1163 queue = kacpid_wq; 1164 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1165 } 1166 1167 /* 1168 * On some machines, a software-initiated SMI causes corruption unless 1169 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1170 * typically it's done in GPE-related methods that are run via 1171 * workqueues, so we can avoid the known corruption cases by always 1172 * queueing on CPU 0. 1173 */ 1174 ret = queue_work_on(0, queue, &dpc->work); 1175 1176 if (!ret) { 1177 printk(KERN_ERR PREFIX 1178 "Call to queue_work() failed.\n"); 1179 status = AE_ERROR; 1180 kfree(dpc); 1181 } 1182 return status; 1183 } 1184 EXPORT_SYMBOL(acpi_os_execute); 1185 1186 void acpi_os_wait_events_complete(void) 1187 { 1188 /* 1189 * Make sure the GPE handler or the fixed event handler is not used 1190 * on another CPU after removal. 1191 */ 1192 if (acpi_irq_handler) 1193 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt); 1194 flush_workqueue(kacpid_wq); 1195 flush_workqueue(kacpi_notify_wq); 1196 } 1197 1198 struct acpi_hp_work { 1199 struct work_struct work; 1200 struct acpi_device *adev; 1201 u32 src; 1202 }; 1203 1204 static void acpi_hotplug_work_fn(struct work_struct *work) 1205 { 1206 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1207 1208 acpi_os_wait_events_complete(); 1209 acpi_device_hotplug(hpw->adev, hpw->src); 1210 kfree(hpw); 1211 } 1212 1213 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1214 { 1215 struct acpi_hp_work *hpw; 1216 1217 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1218 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1219 adev, src)); 1220 1221 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1222 if (!hpw) 1223 return AE_NO_MEMORY; 1224 1225 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1226 hpw->adev = adev; 1227 hpw->src = src; 1228 /* 1229 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1230 * the hotplug code may call driver .remove() functions, which may 1231 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1232 * these workqueues. 1233 */ 1234 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1235 kfree(hpw); 1236 return AE_ERROR; 1237 } 1238 return AE_OK; 1239 } 1240 1241 bool acpi_queue_hotplug_work(struct work_struct *work) 1242 { 1243 return queue_work(kacpi_hotplug_wq, work); 1244 } 1245 1246 acpi_status 1247 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1248 { 1249 struct semaphore *sem = NULL; 1250 1251 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1252 if (!sem) 1253 return AE_NO_MEMORY; 1254 1255 sema_init(sem, initial_units); 1256 1257 *handle = (acpi_handle *) sem; 1258 1259 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1260 *handle, initial_units)); 1261 1262 return AE_OK; 1263 } 1264 1265 /* 1266 * TODO: A better way to delete semaphores? Linux doesn't have a 1267 * 'delete_semaphore()' function -- may result in an invalid 1268 * pointer dereference for non-synchronized consumers. Should 1269 * we at least check for blocked threads and signal/cancel them? 1270 */ 1271 1272 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1273 { 1274 struct semaphore *sem = (struct semaphore *)handle; 1275 1276 if (!sem) 1277 return AE_BAD_PARAMETER; 1278 1279 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1280 1281 BUG_ON(!list_empty(&sem->wait_list)); 1282 kfree(sem); 1283 sem = NULL; 1284 1285 return AE_OK; 1286 } 1287 1288 /* 1289 * TODO: Support for units > 1? 1290 */ 1291 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1292 { 1293 acpi_status status = AE_OK; 1294 struct semaphore *sem = (struct semaphore *)handle; 1295 long jiffies; 1296 int ret = 0; 1297 1298 if (!sem || (units < 1)) 1299 return AE_BAD_PARAMETER; 1300 1301 if (units > 1) 1302 return AE_SUPPORT; 1303 1304 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1305 handle, units, timeout)); 1306 1307 if (timeout == ACPI_WAIT_FOREVER) 1308 jiffies = MAX_SCHEDULE_TIMEOUT; 1309 else 1310 jiffies = msecs_to_jiffies(timeout); 1311 1312 ret = down_timeout(sem, jiffies); 1313 if (ret) 1314 status = AE_TIME; 1315 1316 if (ACPI_FAILURE(status)) { 1317 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1318 "Failed to acquire semaphore[%p|%d|%d], %s", 1319 handle, units, timeout, 1320 acpi_format_exception(status))); 1321 } else { 1322 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1323 "Acquired semaphore[%p|%d|%d]", handle, 1324 units, timeout)); 1325 } 1326 1327 return status; 1328 } 1329 1330 /* 1331 * TODO: Support for units > 1? 1332 */ 1333 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1334 { 1335 struct semaphore *sem = (struct semaphore *)handle; 1336 1337 if (!sem || (units < 1)) 1338 return AE_BAD_PARAMETER; 1339 1340 if (units > 1) 1341 return AE_SUPPORT; 1342 1343 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1344 units)); 1345 1346 up(sem); 1347 1348 return AE_OK; 1349 } 1350 1351 #ifdef ACPI_FUTURE_USAGE 1352 u32 acpi_os_get_line(char *buffer) 1353 { 1354 1355 #ifdef ENABLE_DEBUGGER 1356 if (acpi_in_debugger) { 1357 u32 chars; 1358 1359 kdb_read(buffer, sizeof(line_buf)); 1360 1361 /* remove the CR kdb includes */ 1362 chars = strlen(buffer) - 1; 1363 buffer[chars] = '\0'; 1364 } 1365 #endif 1366 1367 return 0; 1368 } 1369 #endif /* ACPI_FUTURE_USAGE */ 1370 1371 acpi_status acpi_os_signal(u32 function, void *info) 1372 { 1373 switch (function) { 1374 case ACPI_SIGNAL_FATAL: 1375 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1376 break; 1377 case ACPI_SIGNAL_BREAKPOINT: 1378 /* 1379 * AML Breakpoint 1380 * ACPI spec. says to treat it as a NOP unless 1381 * you are debugging. So if/when we integrate 1382 * AML debugger into the kernel debugger its 1383 * hook will go here. But until then it is 1384 * not useful to print anything on breakpoints. 1385 */ 1386 break; 1387 default: 1388 break; 1389 } 1390 1391 return AE_OK; 1392 } 1393 1394 static int __init acpi_os_name_setup(char *str) 1395 { 1396 char *p = acpi_os_name; 1397 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1398 1399 if (!str || !*str) 1400 return 0; 1401 1402 for (; count-- && *str; str++) { 1403 if (isalnum(*str) || *str == ' ' || *str == ':') 1404 *p++ = *str; 1405 else if (*str == '\'' || *str == '"') 1406 continue; 1407 else 1408 break; 1409 } 1410 *p = 0; 1411 1412 return 1; 1413 1414 } 1415 1416 __setup("acpi_os_name=", acpi_os_name_setup); 1417 1418 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1419 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1420 1421 struct osi_setup_entry { 1422 char string[OSI_STRING_LENGTH_MAX]; 1423 bool enable; 1424 }; 1425 1426 static struct osi_setup_entry 1427 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1428 {"Module Device", true}, 1429 {"Processor Device", true}, 1430 {"3.0 _SCP Extensions", true}, 1431 {"Processor Aggregator Device", true}, 1432 }; 1433 1434 void __init acpi_osi_setup(char *str) 1435 { 1436 struct osi_setup_entry *osi; 1437 bool enable = true; 1438 int i; 1439 1440 if (!acpi_gbl_create_osi_method) 1441 return; 1442 1443 if (str == NULL || *str == '\0') { 1444 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1445 acpi_gbl_create_osi_method = FALSE; 1446 return; 1447 } 1448 1449 if (*str == '!') { 1450 str++; 1451 if (*str == '\0') { 1452 osi_linux.default_disabling = 1; 1453 return; 1454 } else if (*str == '*') { 1455 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1456 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1457 osi = &osi_setup_entries[i]; 1458 osi->enable = false; 1459 } 1460 return; 1461 } 1462 enable = false; 1463 } 1464 1465 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1466 osi = &osi_setup_entries[i]; 1467 if (!strcmp(osi->string, str)) { 1468 osi->enable = enable; 1469 break; 1470 } else if (osi->string[0] == '\0') { 1471 osi->enable = enable; 1472 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1473 break; 1474 } 1475 } 1476 } 1477 1478 static void __init set_osi_linux(unsigned int enable) 1479 { 1480 if (osi_linux.enable != enable) 1481 osi_linux.enable = enable; 1482 1483 if (osi_linux.enable) 1484 acpi_osi_setup("Linux"); 1485 else 1486 acpi_osi_setup("!Linux"); 1487 1488 return; 1489 } 1490 1491 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1492 { 1493 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1494 osi_linux.dmi = 0; 1495 set_osi_linux(enable); 1496 1497 return; 1498 } 1499 1500 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1501 { 1502 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1503 1504 if (enable == -1) 1505 return; 1506 1507 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1508 set_osi_linux(enable); 1509 1510 return; 1511 } 1512 1513 /* 1514 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1515 * 1516 * empty string disables _OSI 1517 * string starting with '!' disables that string 1518 * otherwise string is added to list, augmenting built-in strings 1519 */ 1520 static void __init acpi_osi_setup_late(void) 1521 { 1522 struct osi_setup_entry *osi; 1523 char *str; 1524 int i; 1525 acpi_status status; 1526 1527 if (osi_linux.default_disabling) { 1528 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1529 1530 if (ACPI_SUCCESS(status)) 1531 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1532 } 1533 1534 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1535 osi = &osi_setup_entries[i]; 1536 str = osi->string; 1537 1538 if (*str == '\0') 1539 break; 1540 if (osi->enable) { 1541 status = acpi_install_interface(str); 1542 1543 if (ACPI_SUCCESS(status)) 1544 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1545 } else { 1546 status = acpi_remove_interface(str); 1547 1548 if (ACPI_SUCCESS(status)) 1549 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1550 } 1551 } 1552 } 1553 1554 static int __init osi_setup(char *str) 1555 { 1556 if (str && !strcmp("Linux", str)) 1557 acpi_cmdline_osi_linux(1); 1558 else if (str && !strcmp("!Linux", str)) 1559 acpi_cmdline_osi_linux(0); 1560 else 1561 acpi_osi_setup(str); 1562 1563 return 1; 1564 } 1565 1566 __setup("acpi_osi=", osi_setup); 1567 1568 /* 1569 * Disable the auto-serialization of named objects creation methods. 1570 * 1571 * This feature is enabled by default. It marks the AML control methods 1572 * that contain the opcodes to create named objects as "Serialized". 1573 */ 1574 static int __init acpi_no_auto_serialize_setup(char *str) 1575 { 1576 acpi_gbl_auto_serialize_methods = FALSE; 1577 pr_info("ACPI: auto-serialization disabled\n"); 1578 1579 return 1; 1580 } 1581 1582 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1583 1584 /* Check of resource interference between native drivers and ACPI 1585 * OperationRegions (SystemIO and System Memory only). 1586 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1587 * in arbitrary AML code and can interfere with legacy drivers. 1588 * acpi_enforce_resources= can be set to: 1589 * 1590 * - strict (default) (2) 1591 * -> further driver trying to access the resources will not load 1592 * - lax (1) 1593 * -> further driver trying to access the resources will load, but you 1594 * get a system message that something might go wrong... 1595 * 1596 * - no (0) 1597 * -> ACPI Operation Region resources will not be registered 1598 * 1599 */ 1600 #define ENFORCE_RESOURCES_STRICT 2 1601 #define ENFORCE_RESOURCES_LAX 1 1602 #define ENFORCE_RESOURCES_NO 0 1603 1604 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1605 1606 static int __init acpi_enforce_resources_setup(char *str) 1607 { 1608 if (str == NULL || *str == '\0') 1609 return 0; 1610 1611 if (!strcmp("strict", str)) 1612 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1613 else if (!strcmp("lax", str)) 1614 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1615 else if (!strcmp("no", str)) 1616 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1617 1618 return 1; 1619 } 1620 1621 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1622 1623 /* Check for resource conflicts between ACPI OperationRegions and native 1624 * drivers */ 1625 int acpi_check_resource_conflict(const struct resource *res) 1626 { 1627 acpi_adr_space_type space_id; 1628 acpi_size length; 1629 u8 warn = 0; 1630 int clash = 0; 1631 1632 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1633 return 0; 1634 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1635 return 0; 1636 1637 if (res->flags & IORESOURCE_IO) 1638 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1639 else 1640 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1641 1642 length = resource_size(res); 1643 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1644 warn = 1; 1645 clash = acpi_check_address_range(space_id, res->start, length, warn); 1646 1647 if (clash) { 1648 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1649 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1650 printk(KERN_NOTICE "ACPI: This conflict may" 1651 " cause random problems and system" 1652 " instability\n"); 1653 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1654 " for this device, you should use it instead of" 1655 " the native driver\n"); 1656 } 1657 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1658 return -EBUSY; 1659 } 1660 return 0; 1661 } 1662 EXPORT_SYMBOL(acpi_check_resource_conflict); 1663 1664 int acpi_check_region(resource_size_t start, resource_size_t n, 1665 const char *name) 1666 { 1667 struct resource res = { 1668 .start = start, 1669 .end = start + n - 1, 1670 .name = name, 1671 .flags = IORESOURCE_IO, 1672 }; 1673 1674 return acpi_check_resource_conflict(&res); 1675 } 1676 EXPORT_SYMBOL(acpi_check_region); 1677 1678 /* 1679 * Let drivers know whether the resource checks are effective 1680 */ 1681 int acpi_resources_are_enforced(void) 1682 { 1683 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1684 } 1685 EXPORT_SYMBOL(acpi_resources_are_enforced); 1686 1687 /* 1688 * Deallocate the memory for a spinlock. 1689 */ 1690 void acpi_os_delete_lock(acpi_spinlock handle) 1691 { 1692 ACPI_FREE(handle); 1693 } 1694 1695 /* 1696 * Acquire a spinlock. 1697 * 1698 * handle is a pointer to the spinlock_t. 1699 */ 1700 1701 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1702 { 1703 acpi_cpu_flags flags; 1704 spin_lock_irqsave(lockp, flags); 1705 return flags; 1706 } 1707 1708 /* 1709 * Release a spinlock. See above. 1710 */ 1711 1712 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1713 { 1714 spin_unlock_irqrestore(lockp, flags); 1715 } 1716 1717 #ifndef ACPI_USE_LOCAL_CACHE 1718 1719 /******************************************************************************* 1720 * 1721 * FUNCTION: acpi_os_create_cache 1722 * 1723 * PARAMETERS: name - Ascii name for the cache 1724 * size - Size of each cached object 1725 * depth - Maximum depth of the cache (in objects) <ignored> 1726 * cache - Where the new cache object is returned 1727 * 1728 * RETURN: status 1729 * 1730 * DESCRIPTION: Create a cache object 1731 * 1732 ******************************************************************************/ 1733 1734 acpi_status 1735 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1736 { 1737 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1738 if (*cache == NULL) 1739 return AE_ERROR; 1740 else 1741 return AE_OK; 1742 } 1743 1744 /******************************************************************************* 1745 * 1746 * FUNCTION: acpi_os_purge_cache 1747 * 1748 * PARAMETERS: Cache - Handle to cache object 1749 * 1750 * RETURN: Status 1751 * 1752 * DESCRIPTION: Free all objects within the requested cache. 1753 * 1754 ******************************************************************************/ 1755 1756 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1757 { 1758 kmem_cache_shrink(cache); 1759 return (AE_OK); 1760 } 1761 1762 /******************************************************************************* 1763 * 1764 * FUNCTION: acpi_os_delete_cache 1765 * 1766 * PARAMETERS: Cache - Handle to cache object 1767 * 1768 * RETURN: Status 1769 * 1770 * DESCRIPTION: Free all objects within the requested cache and delete the 1771 * cache object. 1772 * 1773 ******************************************************************************/ 1774 1775 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1776 { 1777 kmem_cache_destroy(cache); 1778 return (AE_OK); 1779 } 1780 1781 /******************************************************************************* 1782 * 1783 * FUNCTION: acpi_os_release_object 1784 * 1785 * PARAMETERS: Cache - Handle to cache object 1786 * Object - The object to be released 1787 * 1788 * RETURN: None 1789 * 1790 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1791 * the object is deleted. 1792 * 1793 ******************************************************************************/ 1794 1795 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1796 { 1797 kmem_cache_free(cache, object); 1798 return (AE_OK); 1799 } 1800 #endif 1801 1802 static int __init acpi_no_static_ssdt_setup(char *s) 1803 { 1804 acpi_gbl_disable_ssdt_table_install = TRUE; 1805 pr_info("ACPI: static SSDT installation disabled\n"); 1806 1807 return 0; 1808 } 1809 1810 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1811 1812 static int __init acpi_disable_return_repair(char *s) 1813 { 1814 printk(KERN_NOTICE PREFIX 1815 "ACPI: Predefined validation mechanism disabled\n"); 1816 acpi_gbl_disable_auto_repair = TRUE; 1817 1818 return 1; 1819 } 1820 1821 __setup("acpica_no_return_repair", acpi_disable_return_repair); 1822 1823 acpi_status __init acpi_os_initialize(void) 1824 { 1825 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1826 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1827 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1828 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1829 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1830 /* 1831 * Use acpi_os_map_generic_address to pre-map the reset 1832 * register if it's in system memory. 1833 */ 1834 int rv; 1835 1836 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1837 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1838 } 1839 1840 return AE_OK; 1841 } 1842 1843 acpi_status __init acpi_os_initialize1(void) 1844 { 1845 acpi_reserve_resources(); 1846 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1847 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1848 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1849 BUG_ON(!kacpid_wq); 1850 BUG_ON(!kacpi_notify_wq); 1851 BUG_ON(!kacpi_hotplug_wq); 1852 acpi_install_interface_handler(acpi_osi_handler); 1853 acpi_osi_setup_late(); 1854 return AE_OK; 1855 } 1856 1857 acpi_status acpi_os_terminate(void) 1858 { 1859 if (acpi_irq_handler) { 1860 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1861 acpi_irq_handler); 1862 } 1863 1864 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1865 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1866 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1867 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1868 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1869 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1870 1871 destroy_workqueue(kacpid_wq); 1872 destroy_workqueue(kacpi_notify_wq); 1873 destroy_workqueue(kacpi_hotplug_wq); 1874 1875 return AE_OK; 1876 } 1877 1878 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1879 u32 pm1b_control) 1880 { 1881 int rc = 0; 1882 if (__acpi_os_prepare_sleep) 1883 rc = __acpi_os_prepare_sleep(sleep_state, 1884 pm1a_control, pm1b_control); 1885 if (rc < 0) 1886 return AE_ERROR; 1887 else if (rc > 0) 1888 return AE_CTRL_SKIP; 1889 1890 return AE_OK; 1891 } 1892 1893 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1894 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1895 { 1896 __acpi_os_prepare_sleep = func; 1897 } 1898 1899 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1900 u32 val_b) 1901 { 1902 int rc = 0; 1903 if (__acpi_os_prepare_extended_sleep) 1904 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1905 val_a, val_b); 1906 if (rc < 0) 1907 return AE_ERROR; 1908 else if (rc > 0) 1909 return AE_CTRL_SKIP; 1910 1911 return AE_OK; 1912 } 1913 1914 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1915 u32 val_a, u32 val_b)) 1916 { 1917 __acpi_os_prepare_extended_sleep = func; 1918 } 1919