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 acpi_reserve_region(addr, length, gas->space_id, 0, desc); 179 } 180 181 static void __init acpi_reserve_resources(void) 182 { 183 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 184 "ACPI PM1a_EVT_BLK"); 185 186 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 187 "ACPI PM1b_EVT_BLK"); 188 189 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 190 "ACPI PM1a_CNT_BLK"); 191 192 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 193 "ACPI PM1b_CNT_BLK"); 194 195 if (acpi_gbl_FADT.pm_timer_length == 4) 196 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 197 198 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 199 "ACPI PM2_CNT_BLK"); 200 201 /* Length of GPE blocks must be a non-negative multiple of 2 */ 202 203 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 204 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 205 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 206 207 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 208 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 209 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 210 } 211 212 void acpi_os_printf(const char *fmt, ...) 213 { 214 va_list args; 215 va_start(args, fmt); 216 acpi_os_vprintf(fmt, args); 217 va_end(args); 218 } 219 220 void acpi_os_vprintf(const char *fmt, va_list args) 221 { 222 static char buffer[512]; 223 224 vsprintf(buffer, fmt, args); 225 226 #ifdef ENABLE_DEBUGGER 227 if (acpi_in_debugger) { 228 kdb_printf("%s", buffer); 229 } else { 230 printk(KERN_CONT "%s", buffer); 231 } 232 #else 233 printk(KERN_CONT "%s", buffer); 234 #endif 235 } 236 237 #ifdef CONFIG_KEXEC 238 static unsigned long acpi_rsdp; 239 static int __init setup_acpi_rsdp(char *arg) 240 { 241 if (kstrtoul(arg, 16, &acpi_rsdp)) 242 return -EINVAL; 243 return 0; 244 } 245 early_param("acpi_rsdp", setup_acpi_rsdp); 246 #endif 247 248 acpi_physical_address __init acpi_os_get_root_pointer(void) 249 { 250 #ifdef CONFIG_KEXEC 251 if (acpi_rsdp) 252 return acpi_rsdp; 253 #endif 254 255 if (efi_enabled(EFI_CONFIG_TABLES)) { 256 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 257 return efi.acpi20; 258 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 259 return efi.acpi; 260 else { 261 printk(KERN_ERR PREFIX 262 "System description tables not found\n"); 263 return 0; 264 } 265 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) { 266 acpi_physical_address pa = 0; 267 268 acpi_find_root_pointer(&pa); 269 return pa; 270 } 271 272 return 0; 273 } 274 275 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 276 static struct acpi_ioremap * 277 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 278 { 279 struct acpi_ioremap *map; 280 281 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 282 if (map->phys <= phys && 283 phys + size <= map->phys + map->size) 284 return map; 285 286 return NULL; 287 } 288 289 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 290 static void __iomem * 291 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 292 { 293 struct acpi_ioremap *map; 294 295 map = acpi_map_lookup(phys, size); 296 if (map) 297 return map->virt + (phys - map->phys); 298 299 return NULL; 300 } 301 302 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 303 { 304 struct acpi_ioremap *map; 305 void __iomem *virt = NULL; 306 307 mutex_lock(&acpi_ioremap_lock); 308 map = acpi_map_lookup(phys, size); 309 if (map) { 310 virt = map->virt + (phys - map->phys); 311 map->refcount++; 312 } 313 mutex_unlock(&acpi_ioremap_lock); 314 return virt; 315 } 316 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 317 318 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 319 static struct acpi_ioremap * 320 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 321 { 322 struct acpi_ioremap *map; 323 324 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 325 if (map->virt <= virt && 326 virt + size <= map->virt + map->size) 327 return map; 328 329 return NULL; 330 } 331 332 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64) 333 /* ioremap will take care of cache attributes */ 334 #define should_use_kmap(pfn) 0 335 #else 336 #define should_use_kmap(pfn) page_is_ram(pfn) 337 #endif 338 339 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 340 { 341 unsigned long pfn; 342 343 pfn = pg_off >> PAGE_SHIFT; 344 if (should_use_kmap(pfn)) { 345 if (pg_sz > PAGE_SIZE) 346 return NULL; 347 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 348 } else 349 return acpi_os_ioremap(pg_off, pg_sz); 350 } 351 352 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 353 { 354 unsigned long pfn; 355 356 pfn = pg_off >> PAGE_SHIFT; 357 if (should_use_kmap(pfn)) 358 kunmap(pfn_to_page(pfn)); 359 else 360 iounmap(vaddr); 361 } 362 363 void __iomem *__init_refok 364 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size) 365 { 366 struct acpi_ioremap *map; 367 void __iomem *virt; 368 acpi_physical_address pg_off; 369 acpi_size pg_sz; 370 371 if (phys > ULONG_MAX) { 372 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 373 return NULL; 374 } 375 376 if (!acpi_gbl_permanent_mmap) 377 return __acpi_map_table((unsigned long)phys, size); 378 379 mutex_lock(&acpi_ioremap_lock); 380 /* Check if there's a suitable mapping already. */ 381 map = acpi_map_lookup(phys, size); 382 if (map) { 383 map->refcount++; 384 goto out; 385 } 386 387 map = kzalloc(sizeof(*map), GFP_KERNEL); 388 if (!map) { 389 mutex_unlock(&acpi_ioremap_lock); 390 return NULL; 391 } 392 393 pg_off = round_down(phys, PAGE_SIZE); 394 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 395 virt = acpi_map(pg_off, pg_sz); 396 if (!virt) { 397 mutex_unlock(&acpi_ioremap_lock); 398 kfree(map); 399 return NULL; 400 } 401 402 INIT_LIST_HEAD(&map->list); 403 map->virt = virt; 404 map->phys = pg_off; 405 map->size = pg_sz; 406 map->refcount = 1; 407 408 list_add_tail_rcu(&map->list, &acpi_ioremaps); 409 410 out: 411 mutex_unlock(&acpi_ioremap_lock); 412 return map->virt + (phys - map->phys); 413 } 414 EXPORT_SYMBOL_GPL(acpi_os_map_iomem); 415 416 void *__init_refok 417 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 418 { 419 return (void *)acpi_os_map_iomem(phys, size); 420 } 421 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 422 423 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 424 { 425 if (!--map->refcount) 426 list_del_rcu(&map->list); 427 } 428 429 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 430 { 431 if (!map->refcount) { 432 synchronize_rcu_expedited(); 433 acpi_unmap(map->phys, map->virt); 434 kfree(map); 435 } 436 } 437 438 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) 439 { 440 struct acpi_ioremap *map; 441 442 if (!acpi_gbl_permanent_mmap) { 443 __acpi_unmap_table(virt, size); 444 return; 445 } 446 447 mutex_lock(&acpi_ioremap_lock); 448 map = acpi_map_lookup_virt(virt, size); 449 if (!map) { 450 mutex_unlock(&acpi_ioremap_lock); 451 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 452 return; 453 } 454 acpi_os_drop_map_ref(map); 455 mutex_unlock(&acpi_ioremap_lock); 456 457 acpi_os_map_cleanup(map); 458 } 459 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem); 460 461 void __ref acpi_os_unmap_memory(void *virt, acpi_size size) 462 { 463 return acpi_os_unmap_iomem((void __iomem *)virt, size); 464 } 465 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 466 467 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 468 { 469 if (!acpi_gbl_permanent_mmap) 470 __acpi_unmap_table(virt, size); 471 } 472 473 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 474 { 475 u64 addr; 476 void __iomem *virt; 477 478 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 479 return 0; 480 481 /* Handle possible alignment issues */ 482 memcpy(&addr, &gas->address, sizeof(addr)); 483 if (!addr || !gas->bit_width) 484 return -EINVAL; 485 486 virt = acpi_os_map_iomem(addr, gas->bit_width / 8); 487 if (!virt) 488 return -EIO; 489 490 return 0; 491 } 492 EXPORT_SYMBOL(acpi_os_map_generic_address); 493 494 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 495 { 496 u64 addr; 497 struct acpi_ioremap *map; 498 499 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 500 return; 501 502 /* Handle possible alignment issues */ 503 memcpy(&addr, &gas->address, sizeof(addr)); 504 if (!addr || !gas->bit_width) 505 return; 506 507 mutex_lock(&acpi_ioremap_lock); 508 map = acpi_map_lookup(addr, gas->bit_width / 8); 509 if (!map) { 510 mutex_unlock(&acpi_ioremap_lock); 511 return; 512 } 513 acpi_os_drop_map_ref(map); 514 mutex_unlock(&acpi_ioremap_lock); 515 516 acpi_os_map_cleanup(map); 517 } 518 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 519 520 #ifdef ACPI_FUTURE_USAGE 521 acpi_status 522 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 523 { 524 if (!phys || !virt) 525 return AE_BAD_PARAMETER; 526 527 *phys = virt_to_phys(virt); 528 529 return AE_OK; 530 } 531 #endif 532 533 #define ACPI_MAX_OVERRIDE_LEN 100 534 535 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 536 537 acpi_status 538 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 539 char **new_val) 540 { 541 if (!init_val || !new_val) 542 return AE_BAD_PARAMETER; 543 544 *new_val = NULL; 545 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 546 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 547 acpi_os_name); 548 *new_val = acpi_os_name; 549 } 550 551 return AE_OK; 552 } 553 554 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 555 #include <linux/earlycpio.h> 556 #include <linux/memblock.h> 557 558 static u64 acpi_tables_addr; 559 static int all_tables_size; 560 561 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 562 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 563 { 564 u8 sum = 0; 565 u8 *end = buffer + length; 566 567 while (buffer < end) 568 sum = (u8) (sum + *(buffer++)); 569 return sum; 570 } 571 572 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 573 static const char * const table_sigs[] = { 574 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 575 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 576 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 577 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 578 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 579 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 580 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 581 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 582 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 583 584 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 585 586 #define ACPI_OVERRIDE_TABLES 64 587 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 588 589 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 590 591 void __init acpi_initrd_override(void *data, size_t size) 592 { 593 int sig, no, table_nr = 0, total_offset = 0; 594 long offset = 0; 595 struct acpi_table_header *table; 596 char cpio_path[32] = "kernel/firmware/acpi/"; 597 struct cpio_data file; 598 599 if (data == NULL || size == 0) 600 return; 601 602 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 603 file = find_cpio_data(cpio_path, data, size, &offset); 604 if (!file.data) 605 break; 606 607 data += offset; 608 size -= offset; 609 610 if (file.size < sizeof(struct acpi_table_header)) { 611 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 612 cpio_path, file.name); 613 continue; 614 } 615 616 table = file.data; 617 618 for (sig = 0; table_sigs[sig]; sig++) 619 if (!memcmp(table->signature, table_sigs[sig], 4)) 620 break; 621 622 if (!table_sigs[sig]) { 623 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 624 cpio_path, file.name); 625 continue; 626 } 627 if (file.size != table->length) { 628 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 629 cpio_path, file.name); 630 continue; 631 } 632 if (acpi_table_checksum(file.data, table->length)) { 633 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 634 cpio_path, file.name); 635 continue; 636 } 637 638 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 639 table->signature, cpio_path, file.name, table->length); 640 641 all_tables_size += table->length; 642 acpi_initrd_files[table_nr].data = file.data; 643 acpi_initrd_files[table_nr].size = file.size; 644 table_nr++; 645 } 646 if (table_nr == 0) 647 return; 648 649 acpi_tables_addr = 650 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 651 all_tables_size, PAGE_SIZE); 652 if (!acpi_tables_addr) { 653 WARN_ON(1); 654 return; 655 } 656 /* 657 * Only calling e820_add_reserve does not work and the 658 * tables are invalid (memory got used) later. 659 * memblock_reserve works as expected and the tables won't get modified. 660 * But it's not enough on X86 because ioremap will 661 * complain later (used by acpi_os_map_memory) that the pages 662 * that should get mapped are not marked "reserved". 663 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 664 * works fine. 665 */ 666 memblock_reserve(acpi_tables_addr, all_tables_size); 667 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 668 669 /* 670 * early_ioremap only can remap 256k one time. If we map all 671 * tables one time, we will hit the limit. Need to map chunks 672 * one by one during copying the same as that in relocate_initrd(). 673 */ 674 for (no = 0; no < table_nr; no++) { 675 unsigned char *src_p = acpi_initrd_files[no].data; 676 phys_addr_t size = acpi_initrd_files[no].size; 677 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 678 phys_addr_t slop, clen; 679 char *dest_p; 680 681 total_offset += size; 682 683 while (size) { 684 slop = dest_addr & ~PAGE_MASK; 685 clen = size; 686 if (clen > MAP_CHUNK_SIZE - slop) 687 clen = MAP_CHUNK_SIZE - slop; 688 dest_p = early_ioremap(dest_addr & PAGE_MASK, 689 clen + slop); 690 memcpy(dest_p + slop, src_p, clen); 691 early_iounmap(dest_p, clen + slop); 692 src_p += clen; 693 dest_addr += clen; 694 size -= clen; 695 } 696 } 697 } 698 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 699 700 static void acpi_table_taint(struct acpi_table_header *table) 701 { 702 pr_warn(PREFIX 703 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 704 table->signature, table->oem_table_id); 705 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 706 } 707 708 709 acpi_status 710 acpi_os_table_override(struct acpi_table_header * existing_table, 711 struct acpi_table_header ** new_table) 712 { 713 if (!existing_table || !new_table) 714 return AE_BAD_PARAMETER; 715 716 *new_table = NULL; 717 718 #ifdef CONFIG_ACPI_CUSTOM_DSDT 719 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 720 *new_table = (struct acpi_table_header *)AmlCode; 721 #endif 722 if (*new_table != NULL) 723 acpi_table_taint(existing_table); 724 return AE_OK; 725 } 726 727 acpi_status 728 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 729 acpi_physical_address *address, 730 u32 *table_length) 731 { 732 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 733 *table_length = 0; 734 *address = 0; 735 return AE_OK; 736 #else 737 int table_offset = 0; 738 struct acpi_table_header *table; 739 740 *table_length = 0; 741 *address = 0; 742 743 if (!acpi_tables_addr) 744 return AE_OK; 745 746 do { 747 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 748 WARN_ON(1); 749 return AE_OK; 750 } 751 752 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 753 ACPI_HEADER_SIZE); 754 755 if (table_offset + table->length > all_tables_size) { 756 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 757 WARN_ON(1); 758 return AE_OK; 759 } 760 761 table_offset += table->length; 762 763 if (memcmp(existing_table->signature, table->signature, 4)) { 764 acpi_os_unmap_memory(table, 765 ACPI_HEADER_SIZE); 766 continue; 767 } 768 769 /* Only override tables with matching oem id */ 770 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 771 ACPI_OEM_TABLE_ID_SIZE)) { 772 acpi_os_unmap_memory(table, 773 ACPI_HEADER_SIZE); 774 continue; 775 } 776 777 table_offset -= table->length; 778 *table_length = table->length; 779 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 780 *address = acpi_tables_addr + table_offset; 781 break; 782 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 783 784 if (*address != 0) 785 acpi_table_taint(existing_table); 786 return AE_OK; 787 #endif 788 } 789 790 static irqreturn_t acpi_irq(int irq, void *dev_id) 791 { 792 u32 handled; 793 794 handled = (*acpi_irq_handler) (acpi_irq_context); 795 796 if (handled) { 797 acpi_irq_handled++; 798 return IRQ_HANDLED; 799 } else { 800 acpi_irq_not_handled++; 801 return IRQ_NONE; 802 } 803 } 804 805 acpi_status 806 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 807 void *context) 808 { 809 unsigned int irq; 810 811 acpi_irq_stats_init(); 812 813 /* 814 * ACPI interrupts different from the SCI in our copy of the FADT are 815 * not supported. 816 */ 817 if (gsi != acpi_gbl_FADT.sci_interrupt) 818 return AE_BAD_PARAMETER; 819 820 if (acpi_irq_handler) 821 return AE_ALREADY_ACQUIRED; 822 823 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 824 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 825 gsi); 826 return AE_OK; 827 } 828 829 acpi_irq_handler = handler; 830 acpi_irq_context = context; 831 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 832 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 833 acpi_irq_handler = NULL; 834 return AE_NOT_ACQUIRED; 835 } 836 837 return AE_OK; 838 } 839 840 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 841 { 842 if (irq != acpi_gbl_FADT.sci_interrupt) 843 return AE_BAD_PARAMETER; 844 845 free_irq(irq, acpi_irq); 846 acpi_irq_handler = NULL; 847 848 return AE_OK; 849 } 850 851 /* 852 * Running in interpreter thread context, safe to sleep 853 */ 854 855 void acpi_os_sleep(u64 ms) 856 { 857 msleep(ms); 858 } 859 860 void acpi_os_stall(u32 us) 861 { 862 while (us) { 863 u32 delay = 1000; 864 865 if (delay > us) 866 delay = us; 867 udelay(delay); 868 touch_nmi_watchdog(); 869 us -= delay; 870 } 871 } 872 873 /* 874 * Support ACPI 3.0 AML Timer operand 875 * Returns 64-bit free-running, monotonically increasing timer 876 * with 100ns granularity 877 */ 878 u64 acpi_os_get_timer(void) 879 { 880 u64 time_ns = ktime_to_ns(ktime_get()); 881 do_div(time_ns, 100); 882 return time_ns; 883 } 884 885 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 886 { 887 u32 dummy; 888 889 if (!value) 890 value = &dummy; 891 892 *value = 0; 893 if (width <= 8) { 894 *(u8 *) value = inb(port); 895 } else if (width <= 16) { 896 *(u16 *) value = inw(port); 897 } else if (width <= 32) { 898 *(u32 *) value = inl(port); 899 } else { 900 BUG(); 901 } 902 903 return AE_OK; 904 } 905 906 EXPORT_SYMBOL(acpi_os_read_port); 907 908 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 909 { 910 if (width <= 8) { 911 outb(value, port); 912 } else if (width <= 16) { 913 outw(value, port); 914 } else if (width <= 32) { 915 outl(value, port); 916 } else { 917 BUG(); 918 } 919 920 return AE_OK; 921 } 922 923 EXPORT_SYMBOL(acpi_os_write_port); 924 925 #ifdef readq 926 static inline u64 read64(const volatile void __iomem *addr) 927 { 928 return readq(addr); 929 } 930 #else 931 static inline u64 read64(const volatile void __iomem *addr) 932 { 933 u64 l, h; 934 l = readl(addr); 935 h = readl(addr+4); 936 return l | (h << 32); 937 } 938 #endif 939 940 acpi_status 941 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 942 { 943 void __iomem *virt_addr; 944 unsigned int size = width / 8; 945 bool unmap = false; 946 u64 dummy; 947 948 rcu_read_lock(); 949 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 950 if (!virt_addr) { 951 rcu_read_unlock(); 952 virt_addr = acpi_os_ioremap(phys_addr, size); 953 if (!virt_addr) 954 return AE_BAD_ADDRESS; 955 unmap = true; 956 } 957 958 if (!value) 959 value = &dummy; 960 961 switch (width) { 962 case 8: 963 *(u8 *) value = readb(virt_addr); 964 break; 965 case 16: 966 *(u16 *) value = readw(virt_addr); 967 break; 968 case 32: 969 *(u32 *) value = readl(virt_addr); 970 break; 971 case 64: 972 *(u64 *) value = read64(virt_addr); 973 break; 974 default: 975 BUG(); 976 } 977 978 if (unmap) 979 iounmap(virt_addr); 980 else 981 rcu_read_unlock(); 982 983 return AE_OK; 984 } 985 986 #ifdef writeq 987 static inline void write64(u64 val, volatile void __iomem *addr) 988 { 989 writeq(val, addr); 990 } 991 #else 992 static inline void write64(u64 val, volatile void __iomem *addr) 993 { 994 writel(val, addr); 995 writel(val>>32, addr+4); 996 } 997 #endif 998 999 acpi_status 1000 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 1001 { 1002 void __iomem *virt_addr; 1003 unsigned int size = width / 8; 1004 bool unmap = false; 1005 1006 rcu_read_lock(); 1007 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1008 if (!virt_addr) { 1009 rcu_read_unlock(); 1010 virt_addr = acpi_os_ioremap(phys_addr, size); 1011 if (!virt_addr) 1012 return AE_BAD_ADDRESS; 1013 unmap = true; 1014 } 1015 1016 switch (width) { 1017 case 8: 1018 writeb(value, virt_addr); 1019 break; 1020 case 16: 1021 writew(value, virt_addr); 1022 break; 1023 case 32: 1024 writel(value, virt_addr); 1025 break; 1026 case 64: 1027 write64(value, virt_addr); 1028 break; 1029 default: 1030 BUG(); 1031 } 1032 1033 if (unmap) 1034 iounmap(virt_addr); 1035 else 1036 rcu_read_unlock(); 1037 1038 return AE_OK; 1039 } 1040 1041 acpi_status 1042 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1043 u64 *value, u32 width) 1044 { 1045 int result, size; 1046 u32 value32; 1047 1048 if (!value) 1049 return AE_BAD_PARAMETER; 1050 1051 switch (width) { 1052 case 8: 1053 size = 1; 1054 break; 1055 case 16: 1056 size = 2; 1057 break; 1058 case 32: 1059 size = 4; 1060 break; 1061 default: 1062 return AE_ERROR; 1063 } 1064 1065 result = raw_pci_read(pci_id->segment, pci_id->bus, 1066 PCI_DEVFN(pci_id->device, pci_id->function), 1067 reg, size, &value32); 1068 *value = value32; 1069 1070 return (result ? AE_ERROR : AE_OK); 1071 } 1072 1073 acpi_status 1074 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1075 u64 value, u32 width) 1076 { 1077 int result, size; 1078 1079 switch (width) { 1080 case 8: 1081 size = 1; 1082 break; 1083 case 16: 1084 size = 2; 1085 break; 1086 case 32: 1087 size = 4; 1088 break; 1089 default: 1090 return AE_ERROR; 1091 } 1092 1093 result = raw_pci_write(pci_id->segment, pci_id->bus, 1094 PCI_DEVFN(pci_id->device, pci_id->function), 1095 reg, size, value); 1096 1097 return (result ? AE_ERROR : AE_OK); 1098 } 1099 1100 static void acpi_os_execute_deferred(struct work_struct *work) 1101 { 1102 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1103 1104 dpc->function(dpc->context); 1105 kfree(dpc); 1106 } 1107 1108 /******************************************************************************* 1109 * 1110 * FUNCTION: acpi_os_execute 1111 * 1112 * PARAMETERS: Type - Type of the callback 1113 * Function - Function to be executed 1114 * Context - Function parameters 1115 * 1116 * RETURN: Status 1117 * 1118 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1119 * immediately executes function on a separate thread. 1120 * 1121 ******************************************************************************/ 1122 1123 acpi_status acpi_os_execute(acpi_execute_type type, 1124 acpi_osd_exec_callback function, void *context) 1125 { 1126 acpi_status status = AE_OK; 1127 struct acpi_os_dpc *dpc; 1128 struct workqueue_struct *queue; 1129 int ret; 1130 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1131 "Scheduling function [%p(%p)] for deferred execution.\n", 1132 function, context)); 1133 1134 /* 1135 * Allocate/initialize DPC structure. Note that this memory will be 1136 * freed by the callee. The kernel handles the work_struct list in a 1137 * way that allows us to also free its memory inside the callee. 1138 * Because we may want to schedule several tasks with different 1139 * parameters we can't use the approach some kernel code uses of 1140 * having a static work_struct. 1141 */ 1142 1143 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1144 if (!dpc) 1145 return AE_NO_MEMORY; 1146 1147 dpc->function = function; 1148 dpc->context = context; 1149 1150 /* 1151 * To prevent lockdep from complaining unnecessarily, make sure that 1152 * there is a different static lockdep key for each workqueue by using 1153 * INIT_WORK() for each of them separately. 1154 */ 1155 if (type == OSL_NOTIFY_HANDLER) { 1156 queue = kacpi_notify_wq; 1157 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1158 } else { 1159 queue = kacpid_wq; 1160 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1161 } 1162 1163 /* 1164 * On some machines, a software-initiated SMI causes corruption unless 1165 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1166 * typically it's done in GPE-related methods that are run via 1167 * workqueues, so we can avoid the known corruption cases by always 1168 * queueing on CPU 0. 1169 */ 1170 ret = queue_work_on(0, queue, &dpc->work); 1171 1172 if (!ret) { 1173 printk(KERN_ERR PREFIX 1174 "Call to queue_work() failed.\n"); 1175 status = AE_ERROR; 1176 kfree(dpc); 1177 } 1178 return status; 1179 } 1180 EXPORT_SYMBOL(acpi_os_execute); 1181 1182 void acpi_os_wait_events_complete(void) 1183 { 1184 /* 1185 * Make sure the GPE handler or the fixed event handler is not used 1186 * on another CPU after removal. 1187 */ 1188 if (acpi_irq_handler) 1189 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt); 1190 flush_workqueue(kacpid_wq); 1191 flush_workqueue(kacpi_notify_wq); 1192 } 1193 1194 struct acpi_hp_work { 1195 struct work_struct work; 1196 struct acpi_device *adev; 1197 u32 src; 1198 }; 1199 1200 static void acpi_hotplug_work_fn(struct work_struct *work) 1201 { 1202 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1203 1204 acpi_os_wait_events_complete(); 1205 acpi_device_hotplug(hpw->adev, hpw->src); 1206 kfree(hpw); 1207 } 1208 1209 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1210 { 1211 struct acpi_hp_work *hpw; 1212 1213 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1214 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1215 adev, src)); 1216 1217 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1218 if (!hpw) 1219 return AE_NO_MEMORY; 1220 1221 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1222 hpw->adev = adev; 1223 hpw->src = src; 1224 /* 1225 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1226 * the hotplug code may call driver .remove() functions, which may 1227 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1228 * these workqueues. 1229 */ 1230 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1231 kfree(hpw); 1232 return AE_ERROR; 1233 } 1234 return AE_OK; 1235 } 1236 1237 bool acpi_queue_hotplug_work(struct work_struct *work) 1238 { 1239 return queue_work(kacpi_hotplug_wq, work); 1240 } 1241 1242 acpi_status 1243 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1244 { 1245 struct semaphore *sem = NULL; 1246 1247 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1248 if (!sem) 1249 return AE_NO_MEMORY; 1250 1251 sema_init(sem, initial_units); 1252 1253 *handle = (acpi_handle *) sem; 1254 1255 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1256 *handle, initial_units)); 1257 1258 return AE_OK; 1259 } 1260 1261 /* 1262 * TODO: A better way to delete semaphores? Linux doesn't have a 1263 * 'delete_semaphore()' function -- may result in an invalid 1264 * pointer dereference for non-synchronized consumers. Should 1265 * we at least check for blocked threads and signal/cancel them? 1266 */ 1267 1268 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1269 { 1270 struct semaphore *sem = (struct semaphore *)handle; 1271 1272 if (!sem) 1273 return AE_BAD_PARAMETER; 1274 1275 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1276 1277 BUG_ON(!list_empty(&sem->wait_list)); 1278 kfree(sem); 1279 sem = NULL; 1280 1281 return AE_OK; 1282 } 1283 1284 /* 1285 * TODO: Support for units > 1? 1286 */ 1287 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1288 { 1289 acpi_status status = AE_OK; 1290 struct semaphore *sem = (struct semaphore *)handle; 1291 long jiffies; 1292 int ret = 0; 1293 1294 if (!sem || (units < 1)) 1295 return AE_BAD_PARAMETER; 1296 1297 if (units > 1) 1298 return AE_SUPPORT; 1299 1300 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1301 handle, units, timeout)); 1302 1303 if (timeout == ACPI_WAIT_FOREVER) 1304 jiffies = MAX_SCHEDULE_TIMEOUT; 1305 else 1306 jiffies = msecs_to_jiffies(timeout); 1307 1308 ret = down_timeout(sem, jiffies); 1309 if (ret) 1310 status = AE_TIME; 1311 1312 if (ACPI_FAILURE(status)) { 1313 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1314 "Failed to acquire semaphore[%p|%d|%d], %s", 1315 handle, units, timeout, 1316 acpi_format_exception(status))); 1317 } else { 1318 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1319 "Acquired semaphore[%p|%d|%d]", handle, 1320 units, timeout)); 1321 } 1322 1323 return status; 1324 } 1325 1326 /* 1327 * TODO: Support for units > 1? 1328 */ 1329 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1330 { 1331 struct semaphore *sem = (struct semaphore *)handle; 1332 1333 if (!sem || (units < 1)) 1334 return AE_BAD_PARAMETER; 1335 1336 if (units > 1) 1337 return AE_SUPPORT; 1338 1339 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1340 units)); 1341 1342 up(sem); 1343 1344 return AE_OK; 1345 } 1346 1347 #ifdef ACPI_FUTURE_USAGE 1348 u32 acpi_os_get_line(char *buffer) 1349 { 1350 1351 #ifdef ENABLE_DEBUGGER 1352 if (acpi_in_debugger) { 1353 u32 chars; 1354 1355 kdb_read(buffer, sizeof(line_buf)); 1356 1357 /* remove the CR kdb includes */ 1358 chars = strlen(buffer) - 1; 1359 buffer[chars] = '\0'; 1360 } 1361 #endif 1362 1363 return 0; 1364 } 1365 #endif /* ACPI_FUTURE_USAGE */ 1366 1367 acpi_status acpi_os_signal(u32 function, void *info) 1368 { 1369 switch (function) { 1370 case ACPI_SIGNAL_FATAL: 1371 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1372 break; 1373 case ACPI_SIGNAL_BREAKPOINT: 1374 /* 1375 * AML Breakpoint 1376 * ACPI spec. says to treat it as a NOP unless 1377 * you are debugging. So if/when we integrate 1378 * AML debugger into the kernel debugger its 1379 * hook will go here. But until then it is 1380 * not useful to print anything on breakpoints. 1381 */ 1382 break; 1383 default: 1384 break; 1385 } 1386 1387 return AE_OK; 1388 } 1389 1390 static int __init acpi_os_name_setup(char *str) 1391 { 1392 char *p = acpi_os_name; 1393 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1394 1395 if (!str || !*str) 1396 return 0; 1397 1398 for (; count-- && *str; str++) { 1399 if (isalnum(*str) || *str == ' ' || *str == ':') 1400 *p++ = *str; 1401 else if (*str == '\'' || *str == '"') 1402 continue; 1403 else 1404 break; 1405 } 1406 *p = 0; 1407 1408 return 1; 1409 1410 } 1411 1412 __setup("acpi_os_name=", acpi_os_name_setup); 1413 1414 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1415 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1416 1417 struct osi_setup_entry { 1418 char string[OSI_STRING_LENGTH_MAX]; 1419 bool enable; 1420 }; 1421 1422 static struct osi_setup_entry 1423 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1424 {"Module Device", true}, 1425 {"Processor Device", true}, 1426 {"3.0 _SCP Extensions", true}, 1427 {"Processor Aggregator Device", true}, 1428 }; 1429 1430 void __init acpi_osi_setup(char *str) 1431 { 1432 struct osi_setup_entry *osi; 1433 bool enable = true; 1434 int i; 1435 1436 if (!acpi_gbl_create_osi_method) 1437 return; 1438 1439 if (str == NULL || *str == '\0') { 1440 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1441 acpi_gbl_create_osi_method = FALSE; 1442 return; 1443 } 1444 1445 if (*str == '!') { 1446 str++; 1447 if (*str == '\0') { 1448 osi_linux.default_disabling = 1; 1449 return; 1450 } else if (*str == '*') { 1451 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1452 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1453 osi = &osi_setup_entries[i]; 1454 osi->enable = false; 1455 } 1456 return; 1457 } 1458 enable = false; 1459 } 1460 1461 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1462 osi = &osi_setup_entries[i]; 1463 if (!strcmp(osi->string, str)) { 1464 osi->enable = enable; 1465 break; 1466 } else if (osi->string[0] == '\0') { 1467 osi->enable = enable; 1468 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1469 break; 1470 } 1471 } 1472 } 1473 1474 static void __init set_osi_linux(unsigned int enable) 1475 { 1476 if (osi_linux.enable != enable) 1477 osi_linux.enable = enable; 1478 1479 if (osi_linux.enable) 1480 acpi_osi_setup("Linux"); 1481 else 1482 acpi_osi_setup("!Linux"); 1483 1484 return; 1485 } 1486 1487 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1488 { 1489 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1490 osi_linux.dmi = 0; 1491 set_osi_linux(enable); 1492 1493 return; 1494 } 1495 1496 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1497 { 1498 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1499 1500 if (enable == -1) 1501 return; 1502 1503 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1504 set_osi_linux(enable); 1505 1506 return; 1507 } 1508 1509 /* 1510 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1511 * 1512 * empty string disables _OSI 1513 * string starting with '!' disables that string 1514 * otherwise string is added to list, augmenting built-in strings 1515 */ 1516 static void __init acpi_osi_setup_late(void) 1517 { 1518 struct osi_setup_entry *osi; 1519 char *str; 1520 int i; 1521 acpi_status status; 1522 1523 if (osi_linux.default_disabling) { 1524 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1525 1526 if (ACPI_SUCCESS(status)) 1527 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1528 } 1529 1530 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1531 osi = &osi_setup_entries[i]; 1532 str = osi->string; 1533 1534 if (*str == '\0') 1535 break; 1536 if (osi->enable) { 1537 status = acpi_install_interface(str); 1538 1539 if (ACPI_SUCCESS(status)) 1540 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1541 } else { 1542 status = acpi_remove_interface(str); 1543 1544 if (ACPI_SUCCESS(status)) 1545 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1546 } 1547 } 1548 } 1549 1550 static int __init osi_setup(char *str) 1551 { 1552 if (str && !strcmp("Linux", str)) 1553 acpi_cmdline_osi_linux(1); 1554 else if (str && !strcmp("!Linux", str)) 1555 acpi_cmdline_osi_linux(0); 1556 else 1557 acpi_osi_setup(str); 1558 1559 return 1; 1560 } 1561 1562 __setup("acpi_osi=", osi_setup); 1563 1564 /* 1565 * Disable the auto-serialization of named objects creation methods. 1566 * 1567 * This feature is enabled by default. It marks the AML control methods 1568 * that contain the opcodes to create named objects as "Serialized". 1569 */ 1570 static int __init acpi_no_auto_serialize_setup(char *str) 1571 { 1572 acpi_gbl_auto_serialize_methods = FALSE; 1573 pr_info("ACPI: auto-serialization disabled\n"); 1574 1575 return 1; 1576 } 1577 1578 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1579 1580 /* Check of resource interference between native drivers and ACPI 1581 * OperationRegions (SystemIO and System Memory only). 1582 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1583 * in arbitrary AML code and can interfere with legacy drivers. 1584 * acpi_enforce_resources= can be set to: 1585 * 1586 * - strict (default) (2) 1587 * -> further driver trying to access the resources will not load 1588 * - lax (1) 1589 * -> further driver trying to access the resources will load, but you 1590 * get a system message that something might go wrong... 1591 * 1592 * - no (0) 1593 * -> ACPI Operation Region resources will not be registered 1594 * 1595 */ 1596 #define ENFORCE_RESOURCES_STRICT 2 1597 #define ENFORCE_RESOURCES_LAX 1 1598 #define ENFORCE_RESOURCES_NO 0 1599 1600 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1601 1602 static int __init acpi_enforce_resources_setup(char *str) 1603 { 1604 if (str == NULL || *str == '\0') 1605 return 0; 1606 1607 if (!strcmp("strict", str)) 1608 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1609 else if (!strcmp("lax", str)) 1610 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1611 else if (!strcmp("no", str)) 1612 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1613 1614 return 1; 1615 } 1616 1617 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1618 1619 /* Check for resource conflicts between ACPI OperationRegions and native 1620 * drivers */ 1621 int acpi_check_resource_conflict(const struct resource *res) 1622 { 1623 acpi_adr_space_type space_id; 1624 acpi_size length; 1625 u8 warn = 0; 1626 int clash = 0; 1627 1628 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1629 return 0; 1630 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1631 return 0; 1632 1633 if (res->flags & IORESOURCE_IO) 1634 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1635 else 1636 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1637 1638 length = resource_size(res); 1639 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1640 warn = 1; 1641 clash = acpi_check_address_range(space_id, res->start, length, warn); 1642 1643 if (clash) { 1644 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1645 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1646 printk(KERN_NOTICE "ACPI: This conflict may" 1647 " cause random problems and system" 1648 " instability\n"); 1649 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1650 " for this device, you should use it instead of" 1651 " the native driver\n"); 1652 } 1653 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1654 return -EBUSY; 1655 } 1656 return 0; 1657 } 1658 EXPORT_SYMBOL(acpi_check_resource_conflict); 1659 1660 int acpi_check_region(resource_size_t start, resource_size_t n, 1661 const char *name) 1662 { 1663 struct resource res = { 1664 .start = start, 1665 .end = start + n - 1, 1666 .name = name, 1667 .flags = IORESOURCE_IO, 1668 }; 1669 1670 return acpi_check_resource_conflict(&res); 1671 } 1672 EXPORT_SYMBOL(acpi_check_region); 1673 1674 /* 1675 * Let drivers know whether the resource checks are effective 1676 */ 1677 int acpi_resources_are_enforced(void) 1678 { 1679 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1680 } 1681 EXPORT_SYMBOL(acpi_resources_are_enforced); 1682 1683 bool acpi_osi_is_win8(void) 1684 { 1685 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8; 1686 } 1687 EXPORT_SYMBOL(acpi_osi_is_win8); 1688 1689 /* 1690 * Deallocate the memory for a spinlock. 1691 */ 1692 void acpi_os_delete_lock(acpi_spinlock handle) 1693 { 1694 ACPI_FREE(handle); 1695 } 1696 1697 /* 1698 * Acquire a spinlock. 1699 * 1700 * handle is a pointer to the spinlock_t. 1701 */ 1702 1703 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1704 { 1705 acpi_cpu_flags flags; 1706 spin_lock_irqsave(lockp, flags); 1707 return flags; 1708 } 1709 1710 /* 1711 * Release a spinlock. See above. 1712 */ 1713 1714 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1715 { 1716 spin_unlock_irqrestore(lockp, flags); 1717 } 1718 1719 #ifndef ACPI_USE_LOCAL_CACHE 1720 1721 /******************************************************************************* 1722 * 1723 * FUNCTION: acpi_os_create_cache 1724 * 1725 * PARAMETERS: name - Ascii name for the cache 1726 * size - Size of each cached object 1727 * depth - Maximum depth of the cache (in objects) <ignored> 1728 * cache - Where the new cache object is returned 1729 * 1730 * RETURN: status 1731 * 1732 * DESCRIPTION: Create a cache object 1733 * 1734 ******************************************************************************/ 1735 1736 acpi_status 1737 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1738 { 1739 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1740 if (*cache == NULL) 1741 return AE_ERROR; 1742 else 1743 return AE_OK; 1744 } 1745 1746 /******************************************************************************* 1747 * 1748 * FUNCTION: acpi_os_purge_cache 1749 * 1750 * PARAMETERS: Cache - Handle to cache object 1751 * 1752 * RETURN: Status 1753 * 1754 * DESCRIPTION: Free all objects within the requested cache. 1755 * 1756 ******************************************************************************/ 1757 1758 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1759 { 1760 kmem_cache_shrink(cache); 1761 return (AE_OK); 1762 } 1763 1764 /******************************************************************************* 1765 * 1766 * FUNCTION: acpi_os_delete_cache 1767 * 1768 * PARAMETERS: Cache - Handle to cache object 1769 * 1770 * RETURN: Status 1771 * 1772 * DESCRIPTION: Free all objects within the requested cache and delete the 1773 * cache object. 1774 * 1775 ******************************************************************************/ 1776 1777 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1778 { 1779 kmem_cache_destroy(cache); 1780 return (AE_OK); 1781 } 1782 1783 /******************************************************************************* 1784 * 1785 * FUNCTION: acpi_os_release_object 1786 * 1787 * PARAMETERS: Cache - Handle to cache object 1788 * Object - The object to be released 1789 * 1790 * RETURN: None 1791 * 1792 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1793 * the object is deleted. 1794 * 1795 ******************************************************************************/ 1796 1797 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1798 { 1799 kmem_cache_free(cache, object); 1800 return (AE_OK); 1801 } 1802 #endif 1803 1804 static int __init acpi_no_static_ssdt_setup(char *s) 1805 { 1806 acpi_gbl_disable_ssdt_table_install = TRUE; 1807 pr_info("ACPI: static SSDT installation disabled\n"); 1808 1809 return 0; 1810 } 1811 1812 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1813 1814 static int __init acpi_disable_return_repair(char *s) 1815 { 1816 printk(KERN_NOTICE PREFIX 1817 "ACPI: Predefined validation mechanism disabled\n"); 1818 acpi_gbl_disable_auto_repair = TRUE; 1819 1820 return 1; 1821 } 1822 1823 __setup("acpica_no_return_repair", acpi_disable_return_repair); 1824 1825 acpi_status __init acpi_os_initialize(void) 1826 { 1827 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1828 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1829 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1830 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1831 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1832 /* 1833 * Use acpi_os_map_generic_address to pre-map the reset 1834 * register if it's in system memory. 1835 */ 1836 int rv; 1837 1838 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1839 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1840 } 1841 1842 return AE_OK; 1843 } 1844 1845 acpi_status __init acpi_os_initialize1(void) 1846 { 1847 acpi_reserve_resources(); 1848 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1849 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1850 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1851 BUG_ON(!kacpid_wq); 1852 BUG_ON(!kacpi_notify_wq); 1853 BUG_ON(!kacpi_hotplug_wq); 1854 acpi_install_interface_handler(acpi_osi_handler); 1855 acpi_osi_setup_late(); 1856 return AE_OK; 1857 } 1858 1859 acpi_status acpi_os_terminate(void) 1860 { 1861 if (acpi_irq_handler) { 1862 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1863 acpi_irq_handler); 1864 } 1865 1866 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1867 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1868 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1869 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1870 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1871 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1872 1873 destroy_workqueue(kacpid_wq); 1874 destroy_workqueue(kacpi_notify_wq); 1875 destroy_workqueue(kacpi_hotplug_wq); 1876 1877 return AE_OK; 1878 } 1879 1880 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1881 u32 pm1b_control) 1882 { 1883 int rc = 0; 1884 if (__acpi_os_prepare_sleep) 1885 rc = __acpi_os_prepare_sleep(sleep_state, 1886 pm1a_control, pm1b_control); 1887 if (rc < 0) 1888 return AE_ERROR; 1889 else if (rc > 0) 1890 return AE_CTRL_SKIP; 1891 1892 return AE_OK; 1893 } 1894 1895 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1896 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1897 { 1898 __acpi_os_prepare_sleep = func; 1899 } 1900 1901 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1902 u32 val_b) 1903 { 1904 int rc = 0; 1905 if (__acpi_os_prepare_extended_sleep) 1906 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1907 val_a, val_b); 1908 if (rc < 0) 1909 return AE_ERROR; 1910 else if (rc > 0) 1911 return AE_CTRL_SKIP; 1912 1913 return AE_OK; 1914 } 1915 1916 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1917 u32 val_a, u32 val_b)) 1918 { 1919 __acpi_os_prepare_extended_sleep = func; 1920 } 1921