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