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 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE 534 static bool acpi_rev_override; 535 536 int __init acpi_rev_override_setup(char *str) 537 { 538 acpi_rev_override = true; 539 return 1; 540 } 541 __setup("acpi_rev_override", acpi_rev_override_setup); 542 #else 543 #define acpi_rev_override false 544 #endif 545 546 #define ACPI_MAX_OVERRIDE_LEN 100 547 548 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 549 550 acpi_status 551 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 552 char **new_val) 553 { 554 if (!init_val || !new_val) 555 return AE_BAD_PARAMETER; 556 557 *new_val = NULL; 558 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 559 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 560 acpi_os_name); 561 *new_val = acpi_os_name; 562 } 563 564 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) { 565 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n"); 566 *new_val = (char *)5; 567 } 568 569 return AE_OK; 570 } 571 572 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 573 #include <linux/earlycpio.h> 574 #include <linux/memblock.h> 575 576 static u64 acpi_tables_addr; 577 static int all_tables_size; 578 579 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 580 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 581 { 582 u8 sum = 0; 583 u8 *end = buffer + length; 584 585 while (buffer < end) 586 sum = (u8) (sum + *(buffer++)); 587 return sum; 588 } 589 590 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 591 static const char * const table_sigs[] = { 592 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 593 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 594 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 595 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 596 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 597 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 598 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 599 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 600 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 601 602 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 603 604 #define ACPI_OVERRIDE_TABLES 64 605 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 606 607 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 608 609 void __init acpi_initrd_override(void *data, size_t size) 610 { 611 int sig, no, table_nr = 0, total_offset = 0; 612 long offset = 0; 613 struct acpi_table_header *table; 614 char cpio_path[32] = "kernel/firmware/acpi/"; 615 struct cpio_data file; 616 617 if (data == NULL || size == 0) 618 return; 619 620 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 621 file = find_cpio_data(cpio_path, data, size, &offset); 622 if (!file.data) 623 break; 624 625 data += offset; 626 size -= offset; 627 628 if (file.size < sizeof(struct acpi_table_header)) { 629 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 630 cpio_path, file.name); 631 continue; 632 } 633 634 table = file.data; 635 636 for (sig = 0; table_sigs[sig]; sig++) 637 if (!memcmp(table->signature, table_sigs[sig], 4)) 638 break; 639 640 if (!table_sigs[sig]) { 641 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 642 cpio_path, file.name); 643 continue; 644 } 645 if (file.size != table->length) { 646 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 647 cpio_path, file.name); 648 continue; 649 } 650 if (acpi_table_checksum(file.data, table->length)) { 651 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 652 cpio_path, file.name); 653 continue; 654 } 655 656 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 657 table->signature, cpio_path, file.name, table->length); 658 659 all_tables_size += table->length; 660 acpi_initrd_files[table_nr].data = file.data; 661 acpi_initrd_files[table_nr].size = file.size; 662 table_nr++; 663 } 664 if (table_nr == 0) 665 return; 666 667 acpi_tables_addr = 668 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 669 all_tables_size, PAGE_SIZE); 670 if (!acpi_tables_addr) { 671 WARN_ON(1); 672 return; 673 } 674 /* 675 * Only calling e820_add_reserve does not work and the 676 * tables are invalid (memory got used) later. 677 * memblock_reserve works as expected and the tables won't get modified. 678 * But it's not enough on X86 because ioremap will 679 * complain later (used by acpi_os_map_memory) that the pages 680 * that should get mapped are not marked "reserved". 681 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 682 * works fine. 683 */ 684 memblock_reserve(acpi_tables_addr, all_tables_size); 685 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 686 687 /* 688 * early_ioremap only can remap 256k one time. If we map all 689 * tables one time, we will hit the limit. Need to map chunks 690 * one by one during copying the same as that in relocate_initrd(). 691 */ 692 for (no = 0; no < table_nr; no++) { 693 unsigned char *src_p = acpi_initrd_files[no].data; 694 phys_addr_t size = acpi_initrd_files[no].size; 695 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 696 phys_addr_t slop, clen; 697 char *dest_p; 698 699 total_offset += size; 700 701 while (size) { 702 slop = dest_addr & ~PAGE_MASK; 703 clen = size; 704 if (clen > MAP_CHUNK_SIZE - slop) 705 clen = MAP_CHUNK_SIZE - slop; 706 dest_p = early_ioremap(dest_addr & PAGE_MASK, 707 clen + slop); 708 memcpy(dest_p + slop, src_p, clen); 709 early_iounmap(dest_p, clen + slop); 710 src_p += clen; 711 dest_addr += clen; 712 size -= clen; 713 } 714 } 715 } 716 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 717 718 static void acpi_table_taint(struct acpi_table_header *table) 719 { 720 pr_warn(PREFIX 721 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 722 table->signature, table->oem_table_id); 723 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 724 } 725 726 727 acpi_status 728 acpi_os_table_override(struct acpi_table_header * existing_table, 729 struct acpi_table_header ** new_table) 730 { 731 if (!existing_table || !new_table) 732 return AE_BAD_PARAMETER; 733 734 *new_table = NULL; 735 736 #ifdef CONFIG_ACPI_CUSTOM_DSDT 737 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 738 *new_table = (struct acpi_table_header *)AmlCode; 739 #endif 740 if (*new_table != NULL) 741 acpi_table_taint(existing_table); 742 return AE_OK; 743 } 744 745 acpi_status 746 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 747 acpi_physical_address *address, 748 u32 *table_length) 749 { 750 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 751 *table_length = 0; 752 *address = 0; 753 return AE_OK; 754 #else 755 int table_offset = 0; 756 struct acpi_table_header *table; 757 758 *table_length = 0; 759 *address = 0; 760 761 if (!acpi_tables_addr) 762 return AE_OK; 763 764 do { 765 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 766 WARN_ON(1); 767 return AE_OK; 768 } 769 770 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 771 ACPI_HEADER_SIZE); 772 773 if (table_offset + table->length > all_tables_size) { 774 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 775 WARN_ON(1); 776 return AE_OK; 777 } 778 779 table_offset += table->length; 780 781 if (memcmp(existing_table->signature, table->signature, 4)) { 782 acpi_os_unmap_memory(table, 783 ACPI_HEADER_SIZE); 784 continue; 785 } 786 787 /* Only override tables with matching oem id */ 788 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 789 ACPI_OEM_TABLE_ID_SIZE)) { 790 acpi_os_unmap_memory(table, 791 ACPI_HEADER_SIZE); 792 continue; 793 } 794 795 table_offset -= table->length; 796 *table_length = table->length; 797 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 798 *address = acpi_tables_addr + table_offset; 799 break; 800 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 801 802 if (*address != 0) 803 acpi_table_taint(existing_table); 804 return AE_OK; 805 #endif 806 } 807 808 static irqreturn_t acpi_irq(int irq, void *dev_id) 809 { 810 u32 handled; 811 812 handled = (*acpi_irq_handler) (acpi_irq_context); 813 814 if (handled) { 815 acpi_irq_handled++; 816 return IRQ_HANDLED; 817 } else { 818 acpi_irq_not_handled++; 819 return IRQ_NONE; 820 } 821 } 822 823 acpi_status 824 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 825 void *context) 826 { 827 unsigned int irq; 828 829 acpi_irq_stats_init(); 830 831 /* 832 * ACPI interrupts different from the SCI in our copy of the FADT are 833 * not supported. 834 */ 835 if (gsi != acpi_gbl_FADT.sci_interrupt) 836 return AE_BAD_PARAMETER; 837 838 if (acpi_irq_handler) 839 return AE_ALREADY_ACQUIRED; 840 841 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 842 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 843 gsi); 844 return AE_OK; 845 } 846 847 acpi_irq_handler = handler; 848 acpi_irq_context = context; 849 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 850 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 851 acpi_irq_handler = NULL; 852 return AE_NOT_ACQUIRED; 853 } 854 855 return AE_OK; 856 } 857 858 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 859 { 860 if (irq != acpi_gbl_FADT.sci_interrupt) 861 return AE_BAD_PARAMETER; 862 863 free_irq(irq, acpi_irq); 864 acpi_irq_handler = NULL; 865 866 return AE_OK; 867 } 868 869 /* 870 * Running in interpreter thread context, safe to sleep 871 */ 872 873 void acpi_os_sleep(u64 ms) 874 { 875 msleep(ms); 876 } 877 878 void acpi_os_stall(u32 us) 879 { 880 while (us) { 881 u32 delay = 1000; 882 883 if (delay > us) 884 delay = us; 885 udelay(delay); 886 touch_nmi_watchdog(); 887 us -= delay; 888 } 889 } 890 891 /* 892 * Support ACPI 3.0 AML Timer operand 893 * Returns 64-bit free-running, monotonically increasing timer 894 * with 100ns granularity 895 */ 896 u64 acpi_os_get_timer(void) 897 { 898 u64 time_ns = ktime_to_ns(ktime_get()); 899 do_div(time_ns, 100); 900 return time_ns; 901 } 902 903 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 904 { 905 u32 dummy; 906 907 if (!value) 908 value = &dummy; 909 910 *value = 0; 911 if (width <= 8) { 912 *(u8 *) value = inb(port); 913 } else if (width <= 16) { 914 *(u16 *) value = inw(port); 915 } else if (width <= 32) { 916 *(u32 *) value = inl(port); 917 } else { 918 BUG(); 919 } 920 921 return AE_OK; 922 } 923 924 EXPORT_SYMBOL(acpi_os_read_port); 925 926 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 927 { 928 if (width <= 8) { 929 outb(value, port); 930 } else if (width <= 16) { 931 outw(value, port); 932 } else if (width <= 32) { 933 outl(value, port); 934 } else { 935 BUG(); 936 } 937 938 return AE_OK; 939 } 940 941 EXPORT_SYMBOL(acpi_os_write_port); 942 943 #ifdef readq 944 static inline u64 read64(const volatile void __iomem *addr) 945 { 946 return readq(addr); 947 } 948 #else 949 static inline u64 read64(const volatile void __iomem *addr) 950 { 951 u64 l, h; 952 l = readl(addr); 953 h = readl(addr+4); 954 return l | (h << 32); 955 } 956 #endif 957 958 acpi_status 959 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 960 { 961 void __iomem *virt_addr; 962 unsigned int size = width / 8; 963 bool unmap = false; 964 u64 dummy; 965 966 rcu_read_lock(); 967 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 968 if (!virt_addr) { 969 rcu_read_unlock(); 970 virt_addr = acpi_os_ioremap(phys_addr, size); 971 if (!virt_addr) 972 return AE_BAD_ADDRESS; 973 unmap = true; 974 } 975 976 if (!value) 977 value = &dummy; 978 979 switch (width) { 980 case 8: 981 *(u8 *) value = readb(virt_addr); 982 break; 983 case 16: 984 *(u16 *) value = readw(virt_addr); 985 break; 986 case 32: 987 *(u32 *) value = readl(virt_addr); 988 break; 989 case 64: 990 *(u64 *) value = read64(virt_addr); 991 break; 992 default: 993 BUG(); 994 } 995 996 if (unmap) 997 iounmap(virt_addr); 998 else 999 rcu_read_unlock(); 1000 1001 return AE_OK; 1002 } 1003 1004 #ifdef writeq 1005 static inline void write64(u64 val, volatile void __iomem *addr) 1006 { 1007 writeq(val, addr); 1008 } 1009 #else 1010 static inline void write64(u64 val, volatile void __iomem *addr) 1011 { 1012 writel(val, addr); 1013 writel(val>>32, addr+4); 1014 } 1015 #endif 1016 1017 acpi_status 1018 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 1019 { 1020 void __iomem *virt_addr; 1021 unsigned int size = width / 8; 1022 bool unmap = false; 1023 1024 rcu_read_lock(); 1025 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1026 if (!virt_addr) { 1027 rcu_read_unlock(); 1028 virt_addr = acpi_os_ioremap(phys_addr, size); 1029 if (!virt_addr) 1030 return AE_BAD_ADDRESS; 1031 unmap = true; 1032 } 1033 1034 switch (width) { 1035 case 8: 1036 writeb(value, virt_addr); 1037 break; 1038 case 16: 1039 writew(value, virt_addr); 1040 break; 1041 case 32: 1042 writel(value, virt_addr); 1043 break; 1044 case 64: 1045 write64(value, virt_addr); 1046 break; 1047 default: 1048 BUG(); 1049 } 1050 1051 if (unmap) 1052 iounmap(virt_addr); 1053 else 1054 rcu_read_unlock(); 1055 1056 return AE_OK; 1057 } 1058 1059 acpi_status 1060 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1061 u64 *value, u32 width) 1062 { 1063 int result, size; 1064 u32 value32; 1065 1066 if (!value) 1067 return AE_BAD_PARAMETER; 1068 1069 switch (width) { 1070 case 8: 1071 size = 1; 1072 break; 1073 case 16: 1074 size = 2; 1075 break; 1076 case 32: 1077 size = 4; 1078 break; 1079 default: 1080 return AE_ERROR; 1081 } 1082 1083 result = raw_pci_read(pci_id->segment, pci_id->bus, 1084 PCI_DEVFN(pci_id->device, pci_id->function), 1085 reg, size, &value32); 1086 *value = value32; 1087 1088 return (result ? AE_ERROR : AE_OK); 1089 } 1090 1091 acpi_status 1092 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1093 u64 value, u32 width) 1094 { 1095 int result, size; 1096 1097 switch (width) { 1098 case 8: 1099 size = 1; 1100 break; 1101 case 16: 1102 size = 2; 1103 break; 1104 case 32: 1105 size = 4; 1106 break; 1107 default: 1108 return AE_ERROR; 1109 } 1110 1111 result = raw_pci_write(pci_id->segment, pci_id->bus, 1112 PCI_DEVFN(pci_id->device, pci_id->function), 1113 reg, size, value); 1114 1115 return (result ? AE_ERROR : AE_OK); 1116 } 1117 1118 static void acpi_os_execute_deferred(struct work_struct *work) 1119 { 1120 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1121 1122 dpc->function(dpc->context); 1123 kfree(dpc); 1124 } 1125 1126 /******************************************************************************* 1127 * 1128 * FUNCTION: acpi_os_execute 1129 * 1130 * PARAMETERS: Type - Type of the callback 1131 * Function - Function to be executed 1132 * Context - Function parameters 1133 * 1134 * RETURN: Status 1135 * 1136 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1137 * immediately executes function on a separate thread. 1138 * 1139 ******************************************************************************/ 1140 1141 acpi_status acpi_os_execute(acpi_execute_type type, 1142 acpi_osd_exec_callback function, void *context) 1143 { 1144 acpi_status status = AE_OK; 1145 struct acpi_os_dpc *dpc; 1146 struct workqueue_struct *queue; 1147 int ret; 1148 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1149 "Scheduling function [%p(%p)] for deferred execution.\n", 1150 function, context)); 1151 1152 /* 1153 * Allocate/initialize DPC structure. Note that this memory will be 1154 * freed by the callee. The kernel handles the work_struct list in a 1155 * way that allows us to also free its memory inside the callee. 1156 * Because we may want to schedule several tasks with different 1157 * parameters we can't use the approach some kernel code uses of 1158 * having a static work_struct. 1159 */ 1160 1161 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1162 if (!dpc) 1163 return AE_NO_MEMORY; 1164 1165 dpc->function = function; 1166 dpc->context = context; 1167 1168 /* 1169 * To prevent lockdep from complaining unnecessarily, make sure that 1170 * there is a different static lockdep key for each workqueue by using 1171 * INIT_WORK() for each of them separately. 1172 */ 1173 if (type == OSL_NOTIFY_HANDLER) { 1174 queue = kacpi_notify_wq; 1175 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1176 } else { 1177 queue = kacpid_wq; 1178 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1179 } 1180 1181 /* 1182 * On some machines, a software-initiated SMI causes corruption unless 1183 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1184 * typically it's done in GPE-related methods that are run via 1185 * workqueues, so we can avoid the known corruption cases by always 1186 * queueing on CPU 0. 1187 */ 1188 ret = queue_work_on(0, queue, &dpc->work); 1189 1190 if (!ret) { 1191 printk(KERN_ERR PREFIX 1192 "Call to queue_work() failed.\n"); 1193 status = AE_ERROR; 1194 kfree(dpc); 1195 } 1196 return status; 1197 } 1198 EXPORT_SYMBOL(acpi_os_execute); 1199 1200 void acpi_os_wait_events_complete(void) 1201 { 1202 /* 1203 * Make sure the GPE handler or the fixed event handler is not used 1204 * on another CPU after removal. 1205 */ 1206 if (acpi_irq_handler) 1207 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt); 1208 flush_workqueue(kacpid_wq); 1209 flush_workqueue(kacpi_notify_wq); 1210 } 1211 1212 struct acpi_hp_work { 1213 struct work_struct work; 1214 struct acpi_device *adev; 1215 u32 src; 1216 }; 1217 1218 static void acpi_hotplug_work_fn(struct work_struct *work) 1219 { 1220 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1221 1222 acpi_os_wait_events_complete(); 1223 acpi_device_hotplug(hpw->adev, hpw->src); 1224 kfree(hpw); 1225 } 1226 1227 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1228 { 1229 struct acpi_hp_work *hpw; 1230 1231 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1232 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1233 adev, src)); 1234 1235 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1236 if (!hpw) 1237 return AE_NO_MEMORY; 1238 1239 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1240 hpw->adev = adev; 1241 hpw->src = src; 1242 /* 1243 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1244 * the hotplug code may call driver .remove() functions, which may 1245 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1246 * these workqueues. 1247 */ 1248 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1249 kfree(hpw); 1250 return AE_ERROR; 1251 } 1252 return AE_OK; 1253 } 1254 1255 bool acpi_queue_hotplug_work(struct work_struct *work) 1256 { 1257 return queue_work(kacpi_hotplug_wq, work); 1258 } 1259 1260 acpi_status 1261 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1262 { 1263 struct semaphore *sem = NULL; 1264 1265 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1266 if (!sem) 1267 return AE_NO_MEMORY; 1268 1269 sema_init(sem, initial_units); 1270 1271 *handle = (acpi_handle *) sem; 1272 1273 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1274 *handle, initial_units)); 1275 1276 return AE_OK; 1277 } 1278 1279 /* 1280 * TODO: A better way to delete semaphores? Linux doesn't have a 1281 * 'delete_semaphore()' function -- may result in an invalid 1282 * pointer dereference for non-synchronized consumers. Should 1283 * we at least check for blocked threads and signal/cancel them? 1284 */ 1285 1286 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1287 { 1288 struct semaphore *sem = (struct semaphore *)handle; 1289 1290 if (!sem) 1291 return AE_BAD_PARAMETER; 1292 1293 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1294 1295 BUG_ON(!list_empty(&sem->wait_list)); 1296 kfree(sem); 1297 sem = NULL; 1298 1299 return AE_OK; 1300 } 1301 1302 /* 1303 * TODO: Support for units > 1? 1304 */ 1305 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1306 { 1307 acpi_status status = AE_OK; 1308 struct semaphore *sem = (struct semaphore *)handle; 1309 long jiffies; 1310 int ret = 0; 1311 1312 if (!sem || (units < 1)) 1313 return AE_BAD_PARAMETER; 1314 1315 if (units > 1) 1316 return AE_SUPPORT; 1317 1318 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1319 handle, units, timeout)); 1320 1321 if (timeout == ACPI_WAIT_FOREVER) 1322 jiffies = MAX_SCHEDULE_TIMEOUT; 1323 else 1324 jiffies = msecs_to_jiffies(timeout); 1325 1326 ret = down_timeout(sem, jiffies); 1327 if (ret) 1328 status = AE_TIME; 1329 1330 if (ACPI_FAILURE(status)) { 1331 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1332 "Failed to acquire semaphore[%p|%d|%d], %s", 1333 handle, units, timeout, 1334 acpi_format_exception(status))); 1335 } else { 1336 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1337 "Acquired semaphore[%p|%d|%d]", handle, 1338 units, timeout)); 1339 } 1340 1341 return status; 1342 } 1343 1344 /* 1345 * TODO: Support for units > 1? 1346 */ 1347 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1348 { 1349 struct semaphore *sem = (struct semaphore *)handle; 1350 1351 if (!sem || (units < 1)) 1352 return AE_BAD_PARAMETER; 1353 1354 if (units > 1) 1355 return AE_SUPPORT; 1356 1357 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1358 units)); 1359 1360 up(sem); 1361 1362 return AE_OK; 1363 } 1364 1365 #ifdef ACPI_FUTURE_USAGE 1366 u32 acpi_os_get_line(char *buffer) 1367 { 1368 1369 #ifdef ENABLE_DEBUGGER 1370 if (acpi_in_debugger) { 1371 u32 chars; 1372 1373 kdb_read(buffer, sizeof(line_buf)); 1374 1375 /* remove the CR kdb includes */ 1376 chars = strlen(buffer) - 1; 1377 buffer[chars] = '\0'; 1378 } 1379 #endif 1380 1381 return 0; 1382 } 1383 #endif /* ACPI_FUTURE_USAGE */ 1384 1385 acpi_status acpi_os_signal(u32 function, void *info) 1386 { 1387 switch (function) { 1388 case ACPI_SIGNAL_FATAL: 1389 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1390 break; 1391 case ACPI_SIGNAL_BREAKPOINT: 1392 /* 1393 * AML Breakpoint 1394 * ACPI spec. says to treat it as a NOP unless 1395 * you are debugging. So if/when we integrate 1396 * AML debugger into the kernel debugger its 1397 * hook will go here. But until then it is 1398 * not useful to print anything on breakpoints. 1399 */ 1400 break; 1401 default: 1402 break; 1403 } 1404 1405 return AE_OK; 1406 } 1407 1408 static int __init acpi_os_name_setup(char *str) 1409 { 1410 char *p = acpi_os_name; 1411 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1412 1413 if (!str || !*str) 1414 return 0; 1415 1416 for (; count-- && *str; str++) { 1417 if (isalnum(*str) || *str == ' ' || *str == ':') 1418 *p++ = *str; 1419 else if (*str == '\'' || *str == '"') 1420 continue; 1421 else 1422 break; 1423 } 1424 *p = 0; 1425 1426 return 1; 1427 1428 } 1429 1430 __setup("acpi_os_name=", acpi_os_name_setup); 1431 1432 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1433 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1434 1435 struct osi_setup_entry { 1436 char string[OSI_STRING_LENGTH_MAX]; 1437 bool enable; 1438 }; 1439 1440 static struct osi_setup_entry 1441 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1442 {"Module Device", true}, 1443 {"Processor Device", true}, 1444 {"3.0 _SCP Extensions", true}, 1445 {"Processor Aggregator Device", true}, 1446 }; 1447 1448 void __init acpi_osi_setup(char *str) 1449 { 1450 struct osi_setup_entry *osi; 1451 bool enable = true; 1452 int i; 1453 1454 if (!acpi_gbl_create_osi_method) 1455 return; 1456 1457 if (str == NULL || *str == '\0') { 1458 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1459 acpi_gbl_create_osi_method = FALSE; 1460 return; 1461 } 1462 1463 if (*str == '!') { 1464 str++; 1465 if (*str == '\0') { 1466 osi_linux.default_disabling = 1; 1467 return; 1468 } else if (*str == '*') { 1469 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1470 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1471 osi = &osi_setup_entries[i]; 1472 osi->enable = false; 1473 } 1474 return; 1475 } 1476 enable = false; 1477 } 1478 1479 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1480 osi = &osi_setup_entries[i]; 1481 if (!strcmp(osi->string, str)) { 1482 osi->enable = enable; 1483 break; 1484 } else if (osi->string[0] == '\0') { 1485 osi->enable = enable; 1486 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1487 break; 1488 } 1489 } 1490 } 1491 1492 static void __init set_osi_linux(unsigned int enable) 1493 { 1494 if (osi_linux.enable != enable) 1495 osi_linux.enable = enable; 1496 1497 if (osi_linux.enable) 1498 acpi_osi_setup("Linux"); 1499 else 1500 acpi_osi_setup("!Linux"); 1501 1502 return; 1503 } 1504 1505 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1506 { 1507 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1508 osi_linux.dmi = 0; 1509 set_osi_linux(enable); 1510 1511 return; 1512 } 1513 1514 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1515 { 1516 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1517 1518 if (enable == -1) 1519 return; 1520 1521 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1522 set_osi_linux(enable); 1523 1524 return; 1525 } 1526 1527 /* 1528 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1529 * 1530 * empty string disables _OSI 1531 * string starting with '!' disables that string 1532 * otherwise string is added to list, augmenting built-in strings 1533 */ 1534 static void __init acpi_osi_setup_late(void) 1535 { 1536 struct osi_setup_entry *osi; 1537 char *str; 1538 int i; 1539 acpi_status status; 1540 1541 if (osi_linux.default_disabling) { 1542 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1543 1544 if (ACPI_SUCCESS(status)) 1545 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1546 } 1547 1548 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1549 osi = &osi_setup_entries[i]; 1550 str = osi->string; 1551 1552 if (*str == '\0') 1553 break; 1554 if (osi->enable) { 1555 status = acpi_install_interface(str); 1556 1557 if (ACPI_SUCCESS(status)) 1558 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1559 } else { 1560 status = acpi_remove_interface(str); 1561 1562 if (ACPI_SUCCESS(status)) 1563 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1564 } 1565 } 1566 } 1567 1568 static int __init osi_setup(char *str) 1569 { 1570 if (str && !strcmp("Linux", str)) 1571 acpi_cmdline_osi_linux(1); 1572 else if (str && !strcmp("!Linux", str)) 1573 acpi_cmdline_osi_linux(0); 1574 else 1575 acpi_osi_setup(str); 1576 1577 return 1; 1578 } 1579 1580 __setup("acpi_osi=", osi_setup); 1581 1582 /* 1583 * Disable the auto-serialization of named objects creation methods. 1584 * 1585 * This feature is enabled by default. It marks the AML control methods 1586 * that contain the opcodes to create named objects as "Serialized". 1587 */ 1588 static int __init acpi_no_auto_serialize_setup(char *str) 1589 { 1590 acpi_gbl_auto_serialize_methods = FALSE; 1591 pr_info("ACPI: auto-serialization disabled\n"); 1592 1593 return 1; 1594 } 1595 1596 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1597 1598 /* Check of resource interference between native drivers and ACPI 1599 * OperationRegions (SystemIO and System Memory only). 1600 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1601 * in arbitrary AML code and can interfere with legacy drivers. 1602 * acpi_enforce_resources= can be set to: 1603 * 1604 * - strict (default) (2) 1605 * -> further driver trying to access the resources will not load 1606 * - lax (1) 1607 * -> further driver trying to access the resources will load, but you 1608 * get a system message that something might go wrong... 1609 * 1610 * - no (0) 1611 * -> ACPI Operation Region resources will not be registered 1612 * 1613 */ 1614 #define ENFORCE_RESOURCES_STRICT 2 1615 #define ENFORCE_RESOURCES_LAX 1 1616 #define ENFORCE_RESOURCES_NO 0 1617 1618 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1619 1620 static int __init acpi_enforce_resources_setup(char *str) 1621 { 1622 if (str == NULL || *str == '\0') 1623 return 0; 1624 1625 if (!strcmp("strict", str)) 1626 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1627 else if (!strcmp("lax", str)) 1628 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1629 else if (!strcmp("no", str)) 1630 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1631 1632 return 1; 1633 } 1634 1635 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1636 1637 /* Check for resource conflicts between ACPI OperationRegions and native 1638 * drivers */ 1639 int acpi_check_resource_conflict(const struct resource *res) 1640 { 1641 acpi_adr_space_type space_id; 1642 acpi_size length; 1643 u8 warn = 0; 1644 int clash = 0; 1645 1646 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1647 return 0; 1648 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1649 return 0; 1650 1651 if (res->flags & IORESOURCE_IO) 1652 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1653 else 1654 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1655 1656 length = resource_size(res); 1657 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1658 warn = 1; 1659 clash = acpi_check_address_range(space_id, res->start, length, warn); 1660 1661 if (clash) { 1662 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1663 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1664 printk(KERN_NOTICE "ACPI: This conflict may" 1665 " cause random problems and system" 1666 " instability\n"); 1667 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1668 " for this device, you should use it instead of" 1669 " the native driver\n"); 1670 } 1671 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1672 return -EBUSY; 1673 } 1674 return 0; 1675 } 1676 EXPORT_SYMBOL(acpi_check_resource_conflict); 1677 1678 int acpi_check_region(resource_size_t start, resource_size_t n, 1679 const char *name) 1680 { 1681 struct resource res = { 1682 .start = start, 1683 .end = start + n - 1, 1684 .name = name, 1685 .flags = IORESOURCE_IO, 1686 }; 1687 1688 return acpi_check_resource_conflict(&res); 1689 } 1690 EXPORT_SYMBOL(acpi_check_region); 1691 1692 /* 1693 * Let drivers know whether the resource checks are effective 1694 */ 1695 int acpi_resources_are_enforced(void) 1696 { 1697 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1698 } 1699 EXPORT_SYMBOL(acpi_resources_are_enforced); 1700 1701 bool acpi_osi_is_win8(void) 1702 { 1703 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8; 1704 } 1705 EXPORT_SYMBOL(acpi_osi_is_win8); 1706 1707 /* 1708 * Deallocate the memory for a spinlock. 1709 */ 1710 void acpi_os_delete_lock(acpi_spinlock handle) 1711 { 1712 ACPI_FREE(handle); 1713 } 1714 1715 /* 1716 * Acquire a spinlock. 1717 * 1718 * handle is a pointer to the spinlock_t. 1719 */ 1720 1721 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1722 { 1723 acpi_cpu_flags flags; 1724 spin_lock_irqsave(lockp, flags); 1725 return flags; 1726 } 1727 1728 /* 1729 * Release a spinlock. See above. 1730 */ 1731 1732 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1733 { 1734 spin_unlock_irqrestore(lockp, flags); 1735 } 1736 1737 #ifndef ACPI_USE_LOCAL_CACHE 1738 1739 /******************************************************************************* 1740 * 1741 * FUNCTION: acpi_os_create_cache 1742 * 1743 * PARAMETERS: name - Ascii name for the cache 1744 * size - Size of each cached object 1745 * depth - Maximum depth of the cache (in objects) <ignored> 1746 * cache - Where the new cache object is returned 1747 * 1748 * RETURN: status 1749 * 1750 * DESCRIPTION: Create a cache object 1751 * 1752 ******************************************************************************/ 1753 1754 acpi_status 1755 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1756 { 1757 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1758 if (*cache == NULL) 1759 return AE_ERROR; 1760 else 1761 return AE_OK; 1762 } 1763 1764 /******************************************************************************* 1765 * 1766 * FUNCTION: acpi_os_purge_cache 1767 * 1768 * PARAMETERS: Cache - Handle to cache object 1769 * 1770 * RETURN: Status 1771 * 1772 * DESCRIPTION: Free all objects within the requested cache. 1773 * 1774 ******************************************************************************/ 1775 1776 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1777 { 1778 kmem_cache_shrink(cache); 1779 return (AE_OK); 1780 } 1781 1782 /******************************************************************************* 1783 * 1784 * FUNCTION: acpi_os_delete_cache 1785 * 1786 * PARAMETERS: Cache - Handle to cache object 1787 * 1788 * RETURN: Status 1789 * 1790 * DESCRIPTION: Free all objects within the requested cache and delete the 1791 * cache object. 1792 * 1793 ******************************************************************************/ 1794 1795 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1796 { 1797 kmem_cache_destroy(cache); 1798 return (AE_OK); 1799 } 1800 1801 /******************************************************************************* 1802 * 1803 * FUNCTION: acpi_os_release_object 1804 * 1805 * PARAMETERS: Cache - Handle to cache object 1806 * Object - The object to be released 1807 * 1808 * RETURN: None 1809 * 1810 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1811 * the object is deleted. 1812 * 1813 ******************************************************************************/ 1814 1815 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1816 { 1817 kmem_cache_free(cache, object); 1818 return (AE_OK); 1819 } 1820 #endif 1821 1822 static int __init acpi_no_static_ssdt_setup(char *s) 1823 { 1824 acpi_gbl_disable_ssdt_table_install = TRUE; 1825 pr_info("ACPI: static SSDT installation disabled\n"); 1826 1827 return 0; 1828 } 1829 1830 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1831 1832 static int __init acpi_disable_return_repair(char *s) 1833 { 1834 printk(KERN_NOTICE PREFIX 1835 "ACPI: Predefined validation mechanism disabled\n"); 1836 acpi_gbl_disable_auto_repair = TRUE; 1837 1838 return 1; 1839 } 1840 1841 __setup("acpica_no_return_repair", acpi_disable_return_repair); 1842 1843 acpi_status __init acpi_os_initialize(void) 1844 { 1845 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1846 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1847 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1848 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1849 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1850 /* 1851 * Use acpi_os_map_generic_address to pre-map the reset 1852 * register if it's in system memory. 1853 */ 1854 int rv; 1855 1856 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1857 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1858 } 1859 1860 return AE_OK; 1861 } 1862 1863 acpi_status __init acpi_os_initialize1(void) 1864 { 1865 acpi_reserve_resources(); 1866 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1867 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1868 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1869 BUG_ON(!kacpid_wq); 1870 BUG_ON(!kacpi_notify_wq); 1871 BUG_ON(!kacpi_hotplug_wq); 1872 acpi_install_interface_handler(acpi_osi_handler); 1873 acpi_osi_setup_late(); 1874 return AE_OK; 1875 } 1876 1877 acpi_status acpi_os_terminate(void) 1878 { 1879 if (acpi_irq_handler) { 1880 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1881 acpi_irq_handler); 1882 } 1883 1884 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1885 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1886 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1887 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1888 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1889 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1890 1891 destroy_workqueue(kacpid_wq); 1892 destroy_workqueue(kacpi_notify_wq); 1893 destroy_workqueue(kacpi_hotplug_wq); 1894 1895 return AE_OK; 1896 } 1897 1898 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1899 u32 pm1b_control) 1900 { 1901 int rc = 0; 1902 if (__acpi_os_prepare_sleep) 1903 rc = __acpi_os_prepare_sleep(sleep_state, 1904 pm1a_control, pm1b_control); 1905 if (rc < 0) 1906 return AE_ERROR; 1907 else if (rc > 0) 1908 return AE_CTRL_SKIP; 1909 1910 return AE_OK; 1911 } 1912 1913 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1914 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1915 { 1916 __acpi_os_prepare_sleep = func; 1917 } 1918 1919 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1920 u32 val_b) 1921 { 1922 int rc = 0; 1923 if (__acpi_os_prepare_extended_sleep) 1924 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1925 val_a, val_b); 1926 if (rc < 0) 1927 return AE_ERROR; 1928 else if (rc > 0) 1929 return AE_CTRL_SKIP; 1930 1931 return AE_OK; 1932 } 1933 1934 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1935 u32 val_a, u32 val_b)) 1936 { 1937 __acpi_os_prepare_extended_sleep = func; 1938 } 1939