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 fs_initcall_sync(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 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64) 340 /* ioremap will take care of cache attributes */ 341 #define should_use_kmap(pfn) 0 342 #else 343 #define should_use_kmap(pfn) page_is_ram(pfn) 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_expedited(); 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 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE 541 static bool acpi_rev_override; 542 543 int __init acpi_rev_override_setup(char *str) 544 { 545 acpi_rev_override = true; 546 return 1; 547 } 548 __setup("acpi_rev_override", acpi_rev_override_setup); 549 #else 550 #define acpi_rev_override false 551 #endif 552 553 #define ACPI_MAX_OVERRIDE_LEN 100 554 555 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 556 557 acpi_status 558 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 559 char **new_val) 560 { 561 if (!init_val || !new_val) 562 return AE_BAD_PARAMETER; 563 564 *new_val = NULL; 565 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 566 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 567 acpi_os_name); 568 *new_val = acpi_os_name; 569 } 570 571 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) { 572 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n"); 573 *new_val = (char *)5; 574 } 575 576 return AE_OK; 577 } 578 579 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 580 #include <linux/earlycpio.h> 581 #include <linux/memblock.h> 582 583 static u64 acpi_tables_addr; 584 static int all_tables_size; 585 586 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 587 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 588 { 589 u8 sum = 0; 590 u8 *end = buffer + length; 591 592 while (buffer < end) 593 sum = (u8) (sum + *(buffer++)); 594 return sum; 595 } 596 597 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 598 static const char * const table_sigs[] = { 599 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 600 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 601 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 602 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 603 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 604 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 605 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 606 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 607 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 608 609 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 610 611 #define ACPI_OVERRIDE_TABLES 64 612 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 613 614 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 615 616 void __init acpi_initrd_override(void *data, size_t size) 617 { 618 int sig, no, table_nr = 0, total_offset = 0; 619 long offset = 0; 620 struct acpi_table_header *table; 621 char cpio_path[32] = "kernel/firmware/acpi/"; 622 struct cpio_data file; 623 624 if (data == NULL || size == 0) 625 return; 626 627 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 628 file = find_cpio_data(cpio_path, data, size, &offset); 629 if (!file.data) 630 break; 631 632 data += offset; 633 size -= offset; 634 635 if (file.size < sizeof(struct acpi_table_header)) { 636 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 637 cpio_path, file.name); 638 continue; 639 } 640 641 table = file.data; 642 643 for (sig = 0; table_sigs[sig]; sig++) 644 if (!memcmp(table->signature, table_sigs[sig], 4)) 645 break; 646 647 if (!table_sigs[sig]) { 648 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 649 cpio_path, file.name); 650 continue; 651 } 652 if (file.size != table->length) { 653 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 654 cpio_path, file.name); 655 continue; 656 } 657 if (acpi_table_checksum(file.data, table->length)) { 658 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 659 cpio_path, file.name); 660 continue; 661 } 662 663 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 664 table->signature, cpio_path, file.name, table->length); 665 666 all_tables_size += table->length; 667 acpi_initrd_files[table_nr].data = file.data; 668 acpi_initrd_files[table_nr].size = file.size; 669 table_nr++; 670 } 671 if (table_nr == 0) 672 return; 673 674 acpi_tables_addr = 675 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 676 all_tables_size, PAGE_SIZE); 677 if (!acpi_tables_addr) { 678 WARN_ON(1); 679 return; 680 } 681 /* 682 * Only calling e820_add_reserve does not work and the 683 * tables are invalid (memory got used) later. 684 * memblock_reserve works as expected and the tables won't get modified. 685 * But it's not enough on X86 because ioremap will 686 * complain later (used by acpi_os_map_memory) that the pages 687 * that should get mapped are not marked "reserved". 688 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 689 * works fine. 690 */ 691 memblock_reserve(acpi_tables_addr, all_tables_size); 692 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 693 694 /* 695 * early_ioremap only can remap 256k one time. If we map all 696 * tables one time, we will hit the limit. Need to map chunks 697 * one by one during copying the same as that in relocate_initrd(). 698 */ 699 for (no = 0; no < table_nr; no++) { 700 unsigned char *src_p = acpi_initrd_files[no].data; 701 phys_addr_t size = acpi_initrd_files[no].size; 702 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 703 phys_addr_t slop, clen; 704 char *dest_p; 705 706 total_offset += size; 707 708 while (size) { 709 slop = dest_addr & ~PAGE_MASK; 710 clen = size; 711 if (clen > MAP_CHUNK_SIZE - slop) 712 clen = MAP_CHUNK_SIZE - slop; 713 dest_p = early_ioremap(dest_addr & PAGE_MASK, 714 clen + slop); 715 memcpy(dest_p + slop, src_p, clen); 716 early_iounmap(dest_p, clen + slop); 717 src_p += clen; 718 dest_addr += clen; 719 size -= clen; 720 } 721 } 722 } 723 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 724 725 static void acpi_table_taint(struct acpi_table_header *table) 726 { 727 pr_warn(PREFIX 728 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 729 table->signature, table->oem_table_id); 730 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 731 } 732 733 734 acpi_status 735 acpi_os_table_override(struct acpi_table_header * existing_table, 736 struct acpi_table_header ** new_table) 737 { 738 if (!existing_table || !new_table) 739 return AE_BAD_PARAMETER; 740 741 *new_table = NULL; 742 743 #ifdef CONFIG_ACPI_CUSTOM_DSDT 744 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 745 *new_table = (struct acpi_table_header *)AmlCode; 746 #endif 747 if (*new_table != NULL) 748 acpi_table_taint(existing_table); 749 return AE_OK; 750 } 751 752 acpi_status 753 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 754 acpi_physical_address *address, 755 u32 *table_length) 756 { 757 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 758 *table_length = 0; 759 *address = 0; 760 return AE_OK; 761 #else 762 int table_offset = 0; 763 struct acpi_table_header *table; 764 765 *table_length = 0; 766 *address = 0; 767 768 if (!acpi_tables_addr) 769 return AE_OK; 770 771 do { 772 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 773 WARN_ON(1); 774 return AE_OK; 775 } 776 777 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 778 ACPI_HEADER_SIZE); 779 780 if (table_offset + table->length > all_tables_size) { 781 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 782 WARN_ON(1); 783 return AE_OK; 784 } 785 786 table_offset += table->length; 787 788 if (memcmp(existing_table->signature, table->signature, 4)) { 789 acpi_os_unmap_memory(table, 790 ACPI_HEADER_SIZE); 791 continue; 792 } 793 794 /* Only override tables with matching oem id */ 795 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 796 ACPI_OEM_TABLE_ID_SIZE)) { 797 acpi_os_unmap_memory(table, 798 ACPI_HEADER_SIZE); 799 continue; 800 } 801 802 table_offset -= table->length; 803 *table_length = table->length; 804 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 805 *address = acpi_tables_addr + table_offset; 806 break; 807 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 808 809 if (*address != 0) 810 acpi_table_taint(existing_table); 811 return AE_OK; 812 #endif 813 } 814 815 static irqreturn_t acpi_irq(int irq, void *dev_id) 816 { 817 u32 handled; 818 819 handled = (*acpi_irq_handler) (acpi_irq_context); 820 821 if (handled) { 822 acpi_irq_handled++; 823 return IRQ_HANDLED; 824 } else { 825 acpi_irq_not_handled++; 826 return IRQ_NONE; 827 } 828 } 829 830 acpi_status 831 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 832 void *context) 833 { 834 unsigned int irq; 835 836 acpi_irq_stats_init(); 837 838 /* 839 * ACPI interrupts different from the SCI in our copy of the FADT are 840 * not supported. 841 */ 842 if (gsi != acpi_gbl_FADT.sci_interrupt) 843 return AE_BAD_PARAMETER; 844 845 if (acpi_irq_handler) 846 return AE_ALREADY_ACQUIRED; 847 848 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 849 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 850 gsi); 851 return AE_OK; 852 } 853 854 acpi_irq_handler = handler; 855 acpi_irq_context = context; 856 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 857 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 858 acpi_irq_handler = NULL; 859 return AE_NOT_ACQUIRED; 860 } 861 862 return AE_OK; 863 } 864 865 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 866 { 867 if (irq != acpi_gbl_FADT.sci_interrupt) 868 return AE_BAD_PARAMETER; 869 870 free_irq(irq, acpi_irq); 871 acpi_irq_handler = NULL; 872 873 return AE_OK; 874 } 875 876 /* 877 * Running in interpreter thread context, safe to sleep 878 */ 879 880 void acpi_os_sleep(u64 ms) 881 { 882 msleep(ms); 883 } 884 885 void acpi_os_stall(u32 us) 886 { 887 while (us) { 888 u32 delay = 1000; 889 890 if (delay > us) 891 delay = us; 892 udelay(delay); 893 touch_nmi_watchdog(); 894 us -= delay; 895 } 896 } 897 898 /* 899 * Support ACPI 3.0 AML Timer operand 900 * Returns 64-bit free-running, monotonically increasing timer 901 * with 100ns granularity 902 */ 903 u64 acpi_os_get_timer(void) 904 { 905 u64 time_ns = ktime_to_ns(ktime_get()); 906 do_div(time_ns, 100); 907 return time_ns; 908 } 909 910 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 911 { 912 u32 dummy; 913 914 if (!value) 915 value = &dummy; 916 917 *value = 0; 918 if (width <= 8) { 919 *(u8 *) value = inb(port); 920 } else if (width <= 16) { 921 *(u16 *) value = inw(port); 922 } else if (width <= 32) { 923 *(u32 *) value = inl(port); 924 } else { 925 BUG(); 926 } 927 928 return AE_OK; 929 } 930 931 EXPORT_SYMBOL(acpi_os_read_port); 932 933 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 934 { 935 if (width <= 8) { 936 outb(value, port); 937 } else if (width <= 16) { 938 outw(value, port); 939 } else if (width <= 32) { 940 outl(value, port); 941 } else { 942 BUG(); 943 } 944 945 return AE_OK; 946 } 947 948 EXPORT_SYMBOL(acpi_os_write_port); 949 950 #ifdef readq 951 static inline u64 read64(const volatile void __iomem *addr) 952 { 953 return readq(addr); 954 } 955 #else 956 static inline u64 read64(const volatile void __iomem *addr) 957 { 958 u64 l, h; 959 l = readl(addr); 960 h = readl(addr+4); 961 return l | (h << 32); 962 } 963 #endif 964 965 acpi_status 966 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 967 { 968 void __iomem *virt_addr; 969 unsigned int size = width / 8; 970 bool unmap = false; 971 u64 dummy; 972 973 rcu_read_lock(); 974 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 975 if (!virt_addr) { 976 rcu_read_unlock(); 977 virt_addr = acpi_os_ioremap(phys_addr, size); 978 if (!virt_addr) 979 return AE_BAD_ADDRESS; 980 unmap = true; 981 } 982 983 if (!value) 984 value = &dummy; 985 986 switch (width) { 987 case 8: 988 *(u8 *) value = readb(virt_addr); 989 break; 990 case 16: 991 *(u16 *) value = readw(virt_addr); 992 break; 993 case 32: 994 *(u32 *) value = readl(virt_addr); 995 break; 996 case 64: 997 *(u64 *) value = read64(virt_addr); 998 break; 999 default: 1000 BUG(); 1001 } 1002 1003 if (unmap) 1004 iounmap(virt_addr); 1005 else 1006 rcu_read_unlock(); 1007 1008 return AE_OK; 1009 } 1010 1011 #ifdef writeq 1012 static inline void write64(u64 val, volatile void __iomem *addr) 1013 { 1014 writeq(val, addr); 1015 } 1016 #else 1017 static inline void write64(u64 val, volatile void __iomem *addr) 1018 { 1019 writel(val, addr); 1020 writel(val>>32, addr+4); 1021 } 1022 #endif 1023 1024 acpi_status 1025 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 1026 { 1027 void __iomem *virt_addr; 1028 unsigned int size = width / 8; 1029 bool unmap = false; 1030 1031 rcu_read_lock(); 1032 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1033 if (!virt_addr) { 1034 rcu_read_unlock(); 1035 virt_addr = acpi_os_ioremap(phys_addr, size); 1036 if (!virt_addr) 1037 return AE_BAD_ADDRESS; 1038 unmap = true; 1039 } 1040 1041 switch (width) { 1042 case 8: 1043 writeb(value, virt_addr); 1044 break; 1045 case 16: 1046 writew(value, virt_addr); 1047 break; 1048 case 32: 1049 writel(value, virt_addr); 1050 break; 1051 case 64: 1052 write64(value, virt_addr); 1053 break; 1054 default: 1055 BUG(); 1056 } 1057 1058 if (unmap) 1059 iounmap(virt_addr); 1060 else 1061 rcu_read_unlock(); 1062 1063 return AE_OK; 1064 } 1065 1066 acpi_status 1067 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1068 u64 *value, u32 width) 1069 { 1070 int result, size; 1071 u32 value32; 1072 1073 if (!value) 1074 return AE_BAD_PARAMETER; 1075 1076 switch (width) { 1077 case 8: 1078 size = 1; 1079 break; 1080 case 16: 1081 size = 2; 1082 break; 1083 case 32: 1084 size = 4; 1085 break; 1086 default: 1087 return AE_ERROR; 1088 } 1089 1090 result = raw_pci_read(pci_id->segment, pci_id->bus, 1091 PCI_DEVFN(pci_id->device, pci_id->function), 1092 reg, size, &value32); 1093 *value = value32; 1094 1095 return (result ? AE_ERROR : AE_OK); 1096 } 1097 1098 acpi_status 1099 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1100 u64 value, u32 width) 1101 { 1102 int result, size; 1103 1104 switch (width) { 1105 case 8: 1106 size = 1; 1107 break; 1108 case 16: 1109 size = 2; 1110 break; 1111 case 32: 1112 size = 4; 1113 break; 1114 default: 1115 return AE_ERROR; 1116 } 1117 1118 result = raw_pci_write(pci_id->segment, pci_id->bus, 1119 PCI_DEVFN(pci_id->device, pci_id->function), 1120 reg, size, value); 1121 1122 return (result ? AE_ERROR : AE_OK); 1123 } 1124 1125 static void acpi_os_execute_deferred(struct work_struct *work) 1126 { 1127 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1128 1129 dpc->function(dpc->context); 1130 kfree(dpc); 1131 } 1132 1133 /******************************************************************************* 1134 * 1135 * FUNCTION: acpi_os_execute 1136 * 1137 * PARAMETERS: Type - Type of the callback 1138 * Function - Function to be executed 1139 * Context - Function parameters 1140 * 1141 * RETURN: Status 1142 * 1143 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1144 * immediately executes function on a separate thread. 1145 * 1146 ******************************************************************************/ 1147 1148 acpi_status acpi_os_execute(acpi_execute_type type, 1149 acpi_osd_exec_callback function, void *context) 1150 { 1151 acpi_status status = AE_OK; 1152 struct acpi_os_dpc *dpc; 1153 struct workqueue_struct *queue; 1154 int ret; 1155 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1156 "Scheduling function [%p(%p)] for deferred execution.\n", 1157 function, context)); 1158 1159 /* 1160 * Allocate/initialize DPC structure. Note that this memory will be 1161 * freed by the callee. The kernel handles the work_struct list in a 1162 * way that allows us to also free its memory inside the callee. 1163 * Because we may want to schedule several tasks with different 1164 * parameters we can't use the approach some kernel code uses of 1165 * having a static work_struct. 1166 */ 1167 1168 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1169 if (!dpc) 1170 return AE_NO_MEMORY; 1171 1172 dpc->function = function; 1173 dpc->context = context; 1174 1175 /* 1176 * To prevent lockdep from complaining unnecessarily, make sure that 1177 * there is a different static lockdep key for each workqueue by using 1178 * INIT_WORK() for each of them separately. 1179 */ 1180 if (type == OSL_NOTIFY_HANDLER) { 1181 queue = kacpi_notify_wq; 1182 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1183 } else { 1184 queue = kacpid_wq; 1185 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1186 } 1187 1188 /* 1189 * On some machines, a software-initiated SMI causes corruption unless 1190 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1191 * typically it's done in GPE-related methods that are run via 1192 * workqueues, so we can avoid the known corruption cases by always 1193 * queueing on CPU 0. 1194 */ 1195 ret = queue_work_on(0, queue, &dpc->work); 1196 1197 if (!ret) { 1198 printk(KERN_ERR PREFIX 1199 "Call to queue_work() failed.\n"); 1200 status = AE_ERROR; 1201 kfree(dpc); 1202 } 1203 return status; 1204 } 1205 EXPORT_SYMBOL(acpi_os_execute); 1206 1207 void acpi_os_wait_events_complete(void) 1208 { 1209 /* 1210 * Make sure the GPE handler or the fixed event handler is not used 1211 * on another CPU after removal. 1212 */ 1213 if (acpi_irq_handler) 1214 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt); 1215 flush_workqueue(kacpid_wq); 1216 flush_workqueue(kacpi_notify_wq); 1217 } 1218 1219 struct acpi_hp_work { 1220 struct work_struct work; 1221 struct acpi_device *adev; 1222 u32 src; 1223 }; 1224 1225 static void acpi_hotplug_work_fn(struct work_struct *work) 1226 { 1227 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1228 1229 acpi_os_wait_events_complete(); 1230 acpi_device_hotplug(hpw->adev, hpw->src); 1231 kfree(hpw); 1232 } 1233 1234 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1235 { 1236 struct acpi_hp_work *hpw; 1237 1238 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1239 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1240 adev, src)); 1241 1242 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1243 if (!hpw) 1244 return AE_NO_MEMORY; 1245 1246 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1247 hpw->adev = adev; 1248 hpw->src = src; 1249 /* 1250 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1251 * the hotplug code may call driver .remove() functions, which may 1252 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1253 * these workqueues. 1254 */ 1255 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1256 kfree(hpw); 1257 return AE_ERROR; 1258 } 1259 return AE_OK; 1260 } 1261 1262 bool acpi_queue_hotplug_work(struct work_struct *work) 1263 { 1264 return queue_work(kacpi_hotplug_wq, work); 1265 } 1266 1267 acpi_status 1268 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1269 { 1270 struct semaphore *sem = NULL; 1271 1272 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1273 if (!sem) 1274 return AE_NO_MEMORY; 1275 1276 sema_init(sem, initial_units); 1277 1278 *handle = (acpi_handle *) sem; 1279 1280 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1281 *handle, initial_units)); 1282 1283 return AE_OK; 1284 } 1285 1286 /* 1287 * TODO: A better way to delete semaphores? Linux doesn't have a 1288 * 'delete_semaphore()' function -- may result in an invalid 1289 * pointer dereference for non-synchronized consumers. Should 1290 * we at least check for blocked threads and signal/cancel them? 1291 */ 1292 1293 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1294 { 1295 struct semaphore *sem = (struct semaphore *)handle; 1296 1297 if (!sem) 1298 return AE_BAD_PARAMETER; 1299 1300 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1301 1302 BUG_ON(!list_empty(&sem->wait_list)); 1303 kfree(sem); 1304 sem = NULL; 1305 1306 return AE_OK; 1307 } 1308 1309 /* 1310 * TODO: Support for units > 1? 1311 */ 1312 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1313 { 1314 acpi_status status = AE_OK; 1315 struct semaphore *sem = (struct semaphore *)handle; 1316 long jiffies; 1317 int ret = 0; 1318 1319 if (!sem || (units < 1)) 1320 return AE_BAD_PARAMETER; 1321 1322 if (units > 1) 1323 return AE_SUPPORT; 1324 1325 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1326 handle, units, timeout)); 1327 1328 if (timeout == ACPI_WAIT_FOREVER) 1329 jiffies = MAX_SCHEDULE_TIMEOUT; 1330 else 1331 jiffies = msecs_to_jiffies(timeout); 1332 1333 ret = down_timeout(sem, jiffies); 1334 if (ret) 1335 status = AE_TIME; 1336 1337 if (ACPI_FAILURE(status)) { 1338 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1339 "Failed to acquire semaphore[%p|%d|%d], %s", 1340 handle, units, timeout, 1341 acpi_format_exception(status))); 1342 } else { 1343 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1344 "Acquired semaphore[%p|%d|%d]", handle, 1345 units, timeout)); 1346 } 1347 1348 return status; 1349 } 1350 1351 /* 1352 * TODO: Support for units > 1? 1353 */ 1354 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1355 { 1356 struct semaphore *sem = (struct semaphore *)handle; 1357 1358 if (!sem || (units < 1)) 1359 return AE_BAD_PARAMETER; 1360 1361 if (units > 1) 1362 return AE_SUPPORT; 1363 1364 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1365 units)); 1366 1367 up(sem); 1368 1369 return AE_OK; 1370 } 1371 1372 #ifdef ACPI_FUTURE_USAGE 1373 u32 acpi_os_get_line(char *buffer) 1374 { 1375 1376 #ifdef ENABLE_DEBUGGER 1377 if (acpi_in_debugger) { 1378 u32 chars; 1379 1380 kdb_read(buffer, sizeof(line_buf)); 1381 1382 /* remove the CR kdb includes */ 1383 chars = strlen(buffer) - 1; 1384 buffer[chars] = '\0'; 1385 } 1386 #endif 1387 1388 return 0; 1389 } 1390 #endif /* ACPI_FUTURE_USAGE */ 1391 1392 acpi_status acpi_os_signal(u32 function, void *info) 1393 { 1394 switch (function) { 1395 case ACPI_SIGNAL_FATAL: 1396 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1397 break; 1398 case ACPI_SIGNAL_BREAKPOINT: 1399 /* 1400 * AML Breakpoint 1401 * ACPI spec. says to treat it as a NOP unless 1402 * you are debugging. So if/when we integrate 1403 * AML debugger into the kernel debugger its 1404 * hook will go here. But until then it is 1405 * not useful to print anything on breakpoints. 1406 */ 1407 break; 1408 default: 1409 break; 1410 } 1411 1412 return AE_OK; 1413 } 1414 1415 static int __init acpi_os_name_setup(char *str) 1416 { 1417 char *p = acpi_os_name; 1418 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1419 1420 if (!str || !*str) 1421 return 0; 1422 1423 for (; count-- && *str; str++) { 1424 if (isalnum(*str) || *str == ' ' || *str == ':') 1425 *p++ = *str; 1426 else if (*str == '\'' || *str == '"') 1427 continue; 1428 else 1429 break; 1430 } 1431 *p = 0; 1432 1433 return 1; 1434 1435 } 1436 1437 __setup("acpi_os_name=", acpi_os_name_setup); 1438 1439 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1440 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1441 1442 struct osi_setup_entry { 1443 char string[OSI_STRING_LENGTH_MAX]; 1444 bool enable; 1445 }; 1446 1447 static struct osi_setup_entry 1448 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1449 {"Module Device", true}, 1450 {"Processor Device", true}, 1451 {"3.0 _SCP Extensions", true}, 1452 {"Processor Aggregator Device", true}, 1453 }; 1454 1455 void __init acpi_osi_setup(char *str) 1456 { 1457 struct osi_setup_entry *osi; 1458 bool enable = true; 1459 int i; 1460 1461 if (!acpi_gbl_create_osi_method) 1462 return; 1463 1464 if (str == NULL || *str == '\0') { 1465 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1466 acpi_gbl_create_osi_method = FALSE; 1467 return; 1468 } 1469 1470 if (*str == '!') { 1471 str++; 1472 if (*str == '\0') { 1473 osi_linux.default_disabling = 1; 1474 return; 1475 } else if (*str == '*') { 1476 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1477 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1478 osi = &osi_setup_entries[i]; 1479 osi->enable = false; 1480 } 1481 return; 1482 } 1483 enable = false; 1484 } 1485 1486 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1487 osi = &osi_setup_entries[i]; 1488 if (!strcmp(osi->string, str)) { 1489 osi->enable = enable; 1490 break; 1491 } else if (osi->string[0] == '\0') { 1492 osi->enable = enable; 1493 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1494 break; 1495 } 1496 } 1497 } 1498 1499 static void __init set_osi_linux(unsigned int enable) 1500 { 1501 if (osi_linux.enable != enable) 1502 osi_linux.enable = enable; 1503 1504 if (osi_linux.enable) 1505 acpi_osi_setup("Linux"); 1506 else 1507 acpi_osi_setup("!Linux"); 1508 1509 return; 1510 } 1511 1512 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1513 { 1514 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1515 osi_linux.dmi = 0; 1516 set_osi_linux(enable); 1517 1518 return; 1519 } 1520 1521 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1522 { 1523 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1524 1525 if (enable == -1) 1526 return; 1527 1528 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1529 set_osi_linux(enable); 1530 1531 return; 1532 } 1533 1534 /* 1535 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1536 * 1537 * empty string disables _OSI 1538 * string starting with '!' disables that string 1539 * otherwise string is added to list, augmenting built-in strings 1540 */ 1541 static void __init acpi_osi_setup_late(void) 1542 { 1543 struct osi_setup_entry *osi; 1544 char *str; 1545 int i; 1546 acpi_status status; 1547 1548 if (osi_linux.default_disabling) { 1549 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1550 1551 if (ACPI_SUCCESS(status)) 1552 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1553 } 1554 1555 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1556 osi = &osi_setup_entries[i]; 1557 str = osi->string; 1558 1559 if (*str == '\0') 1560 break; 1561 if (osi->enable) { 1562 status = acpi_install_interface(str); 1563 1564 if (ACPI_SUCCESS(status)) 1565 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1566 } else { 1567 status = acpi_remove_interface(str); 1568 1569 if (ACPI_SUCCESS(status)) 1570 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1571 } 1572 } 1573 } 1574 1575 static int __init osi_setup(char *str) 1576 { 1577 if (str && !strcmp("Linux", str)) 1578 acpi_cmdline_osi_linux(1); 1579 else if (str && !strcmp("!Linux", str)) 1580 acpi_cmdline_osi_linux(0); 1581 else 1582 acpi_osi_setup(str); 1583 1584 return 1; 1585 } 1586 1587 __setup("acpi_osi=", osi_setup); 1588 1589 /* 1590 * Disable the auto-serialization of named objects creation methods. 1591 * 1592 * This feature is enabled by default. It marks the AML control methods 1593 * that contain the opcodes to create named objects as "Serialized". 1594 */ 1595 static int __init acpi_no_auto_serialize_setup(char *str) 1596 { 1597 acpi_gbl_auto_serialize_methods = FALSE; 1598 pr_info("ACPI: auto-serialization disabled\n"); 1599 1600 return 1; 1601 } 1602 1603 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1604 1605 /* Check of resource interference between native drivers and ACPI 1606 * OperationRegions (SystemIO and System Memory only). 1607 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1608 * in arbitrary AML code and can interfere with legacy drivers. 1609 * acpi_enforce_resources= can be set to: 1610 * 1611 * - strict (default) (2) 1612 * -> further driver trying to access the resources will not load 1613 * - lax (1) 1614 * -> further driver trying to access the resources will load, but you 1615 * get a system message that something might go wrong... 1616 * 1617 * - no (0) 1618 * -> ACPI Operation Region resources will not be registered 1619 * 1620 */ 1621 #define ENFORCE_RESOURCES_STRICT 2 1622 #define ENFORCE_RESOURCES_LAX 1 1623 #define ENFORCE_RESOURCES_NO 0 1624 1625 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1626 1627 static int __init acpi_enforce_resources_setup(char *str) 1628 { 1629 if (str == NULL || *str == '\0') 1630 return 0; 1631 1632 if (!strcmp("strict", str)) 1633 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1634 else if (!strcmp("lax", str)) 1635 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1636 else if (!strcmp("no", str)) 1637 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1638 1639 return 1; 1640 } 1641 1642 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1643 1644 /* Check for resource conflicts between ACPI OperationRegions and native 1645 * drivers */ 1646 int acpi_check_resource_conflict(const struct resource *res) 1647 { 1648 acpi_adr_space_type space_id; 1649 acpi_size length; 1650 u8 warn = 0; 1651 int clash = 0; 1652 1653 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1654 return 0; 1655 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1656 return 0; 1657 1658 if (res->flags & IORESOURCE_IO) 1659 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1660 else 1661 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1662 1663 length = resource_size(res); 1664 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1665 warn = 1; 1666 clash = acpi_check_address_range(space_id, res->start, length, warn); 1667 1668 if (clash) { 1669 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1670 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1671 printk(KERN_NOTICE "ACPI: This conflict may" 1672 " cause random problems and system" 1673 " instability\n"); 1674 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1675 " for this device, you should use it instead of" 1676 " the native driver\n"); 1677 } 1678 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1679 return -EBUSY; 1680 } 1681 return 0; 1682 } 1683 EXPORT_SYMBOL(acpi_check_resource_conflict); 1684 1685 int acpi_check_region(resource_size_t start, resource_size_t n, 1686 const char *name) 1687 { 1688 struct resource res = { 1689 .start = start, 1690 .end = start + n - 1, 1691 .name = name, 1692 .flags = IORESOURCE_IO, 1693 }; 1694 1695 return acpi_check_resource_conflict(&res); 1696 } 1697 EXPORT_SYMBOL(acpi_check_region); 1698 1699 /* 1700 * Let drivers know whether the resource checks are effective 1701 */ 1702 int acpi_resources_are_enforced(void) 1703 { 1704 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1705 } 1706 EXPORT_SYMBOL(acpi_resources_are_enforced); 1707 1708 bool acpi_osi_is_win8(void) 1709 { 1710 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8; 1711 } 1712 EXPORT_SYMBOL(acpi_osi_is_win8); 1713 1714 /* 1715 * Deallocate the memory for a spinlock. 1716 */ 1717 void acpi_os_delete_lock(acpi_spinlock handle) 1718 { 1719 ACPI_FREE(handle); 1720 } 1721 1722 /* 1723 * Acquire a spinlock. 1724 * 1725 * handle is a pointer to the spinlock_t. 1726 */ 1727 1728 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1729 { 1730 acpi_cpu_flags flags; 1731 spin_lock_irqsave(lockp, flags); 1732 return flags; 1733 } 1734 1735 /* 1736 * Release a spinlock. See above. 1737 */ 1738 1739 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1740 { 1741 spin_unlock_irqrestore(lockp, flags); 1742 } 1743 1744 #ifndef ACPI_USE_LOCAL_CACHE 1745 1746 /******************************************************************************* 1747 * 1748 * FUNCTION: acpi_os_create_cache 1749 * 1750 * PARAMETERS: name - Ascii name for the cache 1751 * size - Size of each cached object 1752 * depth - Maximum depth of the cache (in objects) <ignored> 1753 * cache - Where the new cache object is returned 1754 * 1755 * RETURN: status 1756 * 1757 * DESCRIPTION: Create a cache object 1758 * 1759 ******************************************************************************/ 1760 1761 acpi_status 1762 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1763 { 1764 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1765 if (*cache == NULL) 1766 return AE_ERROR; 1767 else 1768 return AE_OK; 1769 } 1770 1771 /******************************************************************************* 1772 * 1773 * FUNCTION: acpi_os_purge_cache 1774 * 1775 * PARAMETERS: Cache - Handle to cache object 1776 * 1777 * RETURN: Status 1778 * 1779 * DESCRIPTION: Free all objects within the requested cache. 1780 * 1781 ******************************************************************************/ 1782 1783 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1784 { 1785 kmem_cache_shrink(cache); 1786 return (AE_OK); 1787 } 1788 1789 /******************************************************************************* 1790 * 1791 * FUNCTION: acpi_os_delete_cache 1792 * 1793 * PARAMETERS: Cache - Handle to cache object 1794 * 1795 * RETURN: Status 1796 * 1797 * DESCRIPTION: Free all objects within the requested cache and delete the 1798 * cache object. 1799 * 1800 ******************************************************************************/ 1801 1802 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1803 { 1804 kmem_cache_destroy(cache); 1805 return (AE_OK); 1806 } 1807 1808 /******************************************************************************* 1809 * 1810 * FUNCTION: acpi_os_release_object 1811 * 1812 * PARAMETERS: Cache - Handle to cache object 1813 * Object - The object to be released 1814 * 1815 * RETURN: None 1816 * 1817 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1818 * the object is deleted. 1819 * 1820 ******************************************************************************/ 1821 1822 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1823 { 1824 kmem_cache_free(cache, object); 1825 return (AE_OK); 1826 } 1827 #endif 1828 1829 static int __init acpi_no_static_ssdt_setup(char *s) 1830 { 1831 acpi_gbl_disable_ssdt_table_install = TRUE; 1832 pr_info("ACPI: static SSDT installation disabled\n"); 1833 1834 return 0; 1835 } 1836 1837 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1838 1839 static int __init acpi_disable_return_repair(char *s) 1840 { 1841 printk(KERN_NOTICE PREFIX 1842 "ACPI: Predefined validation mechanism disabled\n"); 1843 acpi_gbl_disable_auto_repair = TRUE; 1844 1845 return 1; 1846 } 1847 1848 __setup("acpica_no_return_repair", acpi_disable_return_repair); 1849 1850 acpi_status __init acpi_os_initialize(void) 1851 { 1852 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1853 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1854 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1855 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1856 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1857 /* 1858 * Use acpi_os_map_generic_address to pre-map the reset 1859 * register if it's in system memory. 1860 */ 1861 int rv; 1862 1863 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1864 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1865 } 1866 1867 return AE_OK; 1868 } 1869 1870 acpi_status __init acpi_os_initialize1(void) 1871 { 1872 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1873 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1874 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1875 BUG_ON(!kacpid_wq); 1876 BUG_ON(!kacpi_notify_wq); 1877 BUG_ON(!kacpi_hotplug_wq); 1878 acpi_install_interface_handler(acpi_osi_handler); 1879 acpi_osi_setup_late(); 1880 return AE_OK; 1881 } 1882 1883 acpi_status acpi_os_terminate(void) 1884 { 1885 if (acpi_irq_handler) { 1886 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1887 acpi_irq_handler); 1888 } 1889 1890 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1891 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1892 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1893 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1894 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1895 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1896 1897 destroy_workqueue(kacpid_wq); 1898 destroy_workqueue(kacpi_notify_wq); 1899 destroy_workqueue(kacpi_hotplug_wq); 1900 1901 return AE_OK; 1902 } 1903 1904 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1905 u32 pm1b_control) 1906 { 1907 int rc = 0; 1908 if (__acpi_os_prepare_sleep) 1909 rc = __acpi_os_prepare_sleep(sleep_state, 1910 pm1a_control, pm1b_control); 1911 if (rc < 0) 1912 return AE_ERROR; 1913 else if (rc > 0) 1914 return AE_CTRL_SKIP; 1915 1916 return AE_OK; 1917 } 1918 1919 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1920 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1921 { 1922 __acpi_os_prepare_sleep = func; 1923 } 1924 1925 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1926 u32 val_b) 1927 { 1928 int rc = 0; 1929 if (__acpi_os_prepare_extended_sleep) 1930 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1931 val_a, val_b); 1932 if (rc < 0) 1933 return AE_ERROR; 1934 else if (rc > 0) 1935 return AE_CTRL_SKIP; 1936 1937 return AE_OK; 1938 } 1939 1940 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1941 u32 val_a, u32 val_b)) 1942 { 1943 __acpi_os_prepare_extended_sleep = func; 1944 } 1945