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