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/acpi_io.h> 43 #include <linux/efi.h> 44 #include <linux/ioport.h> 45 #include <linux/list.h> 46 #include <linux/jiffies.h> 47 #include <linux/semaphore.h> 48 49 #include <asm/io.h> 50 #include <asm/uaccess.h> 51 52 #include <acpi/acpi.h> 53 #include <acpi/acpi_bus.h> 54 #include <acpi/processor.h> 55 #include "internal.h" 56 57 #define _COMPONENT ACPI_OS_SERVICES 58 ACPI_MODULE_NAME("osl"); 59 #define PREFIX "ACPI: " 60 struct acpi_os_dpc { 61 acpi_osd_exec_callback function; 62 void *context; 63 struct work_struct work; 64 int wait; 65 }; 66 67 #ifdef CONFIG_ACPI_CUSTOM_DSDT 68 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 69 #endif 70 71 #ifdef ENABLE_DEBUGGER 72 #include <linux/kdb.h> 73 74 /* stuff for debugger support */ 75 int acpi_in_debugger; 76 EXPORT_SYMBOL(acpi_in_debugger); 77 78 extern char line_buf[80]; 79 #endif /*ENABLE_DEBUGGER */ 80 81 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl, 82 u32 pm1b_ctrl); 83 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a, 84 u32 val_b); 85 86 static acpi_osd_handler acpi_irq_handler; 87 static void *acpi_irq_context; 88 static struct workqueue_struct *kacpid_wq; 89 static struct workqueue_struct *kacpi_notify_wq; 90 static struct workqueue_struct *kacpi_hotplug_wq; 91 92 /* 93 * This list of permanent mappings is for memory that may be accessed from 94 * interrupt context, where we can't do the ioremap(). 95 */ 96 struct acpi_ioremap { 97 struct list_head list; 98 void __iomem *virt; 99 acpi_physical_address phys; 100 acpi_size size; 101 unsigned long refcount; 102 }; 103 104 static LIST_HEAD(acpi_ioremaps); 105 static DEFINE_MUTEX(acpi_ioremap_lock); 106 107 static void __init acpi_osi_setup_late(void); 108 109 /* 110 * The story of _OSI(Linux) 111 * 112 * From pre-history through Linux-2.6.22, 113 * Linux responded TRUE upon a BIOS OSI(Linux) query. 114 * 115 * Unfortunately, reference BIOS writers got wind of this 116 * and put OSI(Linux) in their example code, quickly exposing 117 * this string as ill-conceived and opening the door to 118 * an un-bounded number of BIOS incompatibilities. 119 * 120 * For example, OSI(Linux) was used on resume to re-POST a 121 * video card on one system, because Linux at that time 122 * could not do a speedy restore in its native driver. 123 * But then upon gaining quick native restore capability, 124 * Linux has no way to tell the BIOS to skip the time-consuming 125 * POST -- putting Linux at a permanent performance disadvantage. 126 * On another system, the BIOS writer used OSI(Linux) 127 * to infer native OS support for IPMI! On other systems, 128 * OSI(Linux) simply got in the way of Linux claiming to 129 * be compatible with other operating systems, exposing 130 * BIOS issues such as skipped device initialization. 131 * 132 * So "Linux" turned out to be a really poor chose of 133 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 134 * 135 * BIOS writers should NOT query _OSI(Linux) on future systems. 136 * Linux will complain on the console when it sees it, and return FALSE. 137 * To get Linux to return TRUE for your system will require 138 * a kernel source update to add a DMI entry, 139 * or boot with "acpi_osi=Linux" 140 */ 141 142 static struct osi_linux { 143 unsigned int enable:1; 144 unsigned int dmi:1; 145 unsigned int cmdline:1; 146 unsigned int default_disabling:1; 147 } osi_linux = {0, 0, 0, 0}; 148 149 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 150 { 151 if (!strcmp("Linux", interface)) { 152 153 printk_once(KERN_NOTICE FW_BUG PREFIX 154 "BIOS _OSI(Linux) query %s%s\n", 155 osi_linux.enable ? "honored" : "ignored", 156 osi_linux.cmdline ? " via cmdline" : 157 osi_linux.dmi ? " via DMI" : ""); 158 } 159 160 return supported; 161 } 162 163 static void __init acpi_request_region (struct acpi_generic_address *gas, 164 unsigned int length, char *desc) 165 { 166 u64 addr; 167 168 /* Handle possible alignment issues */ 169 memcpy(&addr, &gas->address, sizeof(addr)); 170 if (!addr || !length) 171 return; 172 173 /* Resources are never freed */ 174 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 175 request_region(addr, length, desc); 176 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 177 request_mem_region(addr, length, desc); 178 } 179 180 static int __init acpi_reserve_resources(void) 181 { 182 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 183 "ACPI PM1a_EVT_BLK"); 184 185 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 186 "ACPI PM1b_EVT_BLK"); 187 188 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 189 "ACPI PM1a_CNT_BLK"); 190 191 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 192 "ACPI PM1b_CNT_BLK"); 193 194 if (acpi_gbl_FADT.pm_timer_length == 4) 195 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 196 197 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 198 "ACPI PM2_CNT_BLK"); 199 200 /* Length of GPE blocks must be a non-negative multiple of 2 */ 201 202 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 203 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 204 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 205 206 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 207 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 208 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 209 210 return 0; 211 } 212 device_initcall(acpi_reserve_resources); 213 214 void acpi_os_printf(const char *fmt, ...) 215 { 216 va_list args; 217 va_start(args, fmt); 218 acpi_os_vprintf(fmt, args); 219 va_end(args); 220 } 221 222 void acpi_os_vprintf(const char *fmt, va_list args) 223 { 224 static char buffer[512]; 225 226 vsprintf(buffer, fmt, args); 227 228 #ifdef ENABLE_DEBUGGER 229 if (acpi_in_debugger) { 230 kdb_printf("%s", buffer); 231 } else { 232 printk(KERN_CONT "%s", buffer); 233 } 234 #else 235 printk(KERN_CONT "%s", buffer); 236 #endif 237 } 238 239 #ifdef CONFIG_KEXEC 240 static unsigned long acpi_rsdp; 241 static int __init setup_acpi_rsdp(char *arg) 242 { 243 acpi_rsdp = simple_strtoul(arg, NULL, 16); 244 return 0; 245 } 246 early_param("acpi_rsdp", setup_acpi_rsdp); 247 #endif 248 249 acpi_physical_address __init acpi_os_get_root_pointer(void) 250 { 251 #ifdef CONFIG_KEXEC 252 if (acpi_rsdp) 253 return acpi_rsdp; 254 #endif 255 256 if (efi_enabled(EFI_CONFIG_TABLES)) { 257 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 258 return efi.acpi20; 259 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 260 return efi.acpi; 261 else { 262 printk(KERN_ERR PREFIX 263 "System description tables not found\n"); 264 return 0; 265 } 266 } else { 267 acpi_physical_address pa = 0; 268 269 acpi_find_root_pointer(&pa); 270 return pa; 271 } 272 } 273 274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 275 static struct acpi_ioremap * 276 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 277 { 278 struct acpi_ioremap *map; 279 280 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 281 if (map->phys <= phys && 282 phys + size <= map->phys + map->size) 283 return map; 284 285 return NULL; 286 } 287 288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 289 static void __iomem * 290 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 291 { 292 struct acpi_ioremap *map; 293 294 map = acpi_map_lookup(phys, size); 295 if (map) 296 return map->virt + (phys - map->phys); 297 298 return NULL; 299 } 300 301 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 302 { 303 struct acpi_ioremap *map; 304 void __iomem *virt = NULL; 305 306 mutex_lock(&acpi_ioremap_lock); 307 map = acpi_map_lookup(phys, size); 308 if (map) { 309 virt = map->virt + (phys - map->phys); 310 map->refcount++; 311 } 312 mutex_unlock(&acpi_ioremap_lock); 313 return virt; 314 } 315 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 316 317 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 318 static struct acpi_ioremap * 319 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 320 { 321 struct acpi_ioremap *map; 322 323 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 324 if (map->virt <= virt && 325 virt + size <= map->virt + map->size) 326 return map; 327 328 return NULL; 329 } 330 331 #ifndef CONFIG_IA64 332 #define should_use_kmap(pfn) page_is_ram(pfn) 333 #else 334 /* ioremap will take care of cache attributes */ 335 #define should_use_kmap(pfn) 0 336 #endif 337 338 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 339 { 340 unsigned long pfn; 341 342 pfn = pg_off >> PAGE_SHIFT; 343 if (should_use_kmap(pfn)) { 344 if (pg_sz > PAGE_SIZE) 345 return NULL; 346 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 347 } else 348 return acpi_os_ioremap(pg_off, pg_sz); 349 } 350 351 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 352 { 353 unsigned long pfn; 354 355 pfn = pg_off >> PAGE_SHIFT; 356 if (should_use_kmap(pfn)) 357 kunmap(pfn_to_page(pfn)); 358 else 359 iounmap(vaddr); 360 } 361 362 void __iomem *__init_refok 363 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 364 { 365 struct acpi_ioremap *map; 366 void __iomem *virt; 367 acpi_physical_address pg_off; 368 acpi_size pg_sz; 369 370 if (phys > ULONG_MAX) { 371 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 372 return NULL; 373 } 374 375 if (!acpi_gbl_permanent_mmap) 376 return __acpi_map_table((unsigned long)phys, size); 377 378 mutex_lock(&acpi_ioremap_lock); 379 /* Check if there's a suitable mapping already. */ 380 map = acpi_map_lookup(phys, size); 381 if (map) { 382 map->refcount++; 383 goto out; 384 } 385 386 map = kzalloc(sizeof(*map), GFP_KERNEL); 387 if (!map) { 388 mutex_unlock(&acpi_ioremap_lock); 389 return NULL; 390 } 391 392 pg_off = round_down(phys, PAGE_SIZE); 393 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 394 virt = acpi_map(pg_off, pg_sz); 395 if (!virt) { 396 mutex_unlock(&acpi_ioremap_lock); 397 kfree(map); 398 return NULL; 399 } 400 401 INIT_LIST_HEAD(&map->list); 402 map->virt = virt; 403 map->phys = pg_off; 404 map->size = pg_sz; 405 map->refcount = 1; 406 407 list_add_tail_rcu(&map->list, &acpi_ioremaps); 408 409 out: 410 mutex_unlock(&acpi_ioremap_lock); 411 return map->virt + (phys - map->phys); 412 } 413 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 414 415 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 416 { 417 if (!--map->refcount) 418 list_del_rcu(&map->list); 419 } 420 421 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 422 { 423 if (!map->refcount) { 424 synchronize_rcu(); 425 acpi_unmap(map->phys, map->virt); 426 kfree(map); 427 } 428 } 429 430 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 431 { 432 struct acpi_ioremap *map; 433 434 if (!acpi_gbl_permanent_mmap) { 435 __acpi_unmap_table(virt, size); 436 return; 437 } 438 439 mutex_lock(&acpi_ioremap_lock); 440 map = acpi_map_lookup_virt(virt, size); 441 if (!map) { 442 mutex_unlock(&acpi_ioremap_lock); 443 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 444 return; 445 } 446 acpi_os_drop_map_ref(map); 447 mutex_unlock(&acpi_ioremap_lock); 448 449 acpi_os_map_cleanup(map); 450 } 451 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 452 453 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 454 { 455 if (!acpi_gbl_permanent_mmap) 456 __acpi_unmap_table(virt, size); 457 } 458 459 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 460 { 461 u64 addr; 462 void __iomem *virt; 463 464 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 465 return 0; 466 467 /* Handle possible alignment issues */ 468 memcpy(&addr, &gas->address, sizeof(addr)); 469 if (!addr || !gas->bit_width) 470 return -EINVAL; 471 472 virt = acpi_os_map_memory(addr, gas->bit_width / 8); 473 if (!virt) 474 return -EIO; 475 476 return 0; 477 } 478 EXPORT_SYMBOL(acpi_os_map_generic_address); 479 480 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 481 { 482 u64 addr; 483 struct acpi_ioremap *map; 484 485 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 486 return; 487 488 /* Handle possible alignment issues */ 489 memcpy(&addr, &gas->address, sizeof(addr)); 490 if (!addr || !gas->bit_width) 491 return; 492 493 mutex_lock(&acpi_ioremap_lock); 494 map = acpi_map_lookup(addr, gas->bit_width / 8); 495 if (!map) { 496 mutex_unlock(&acpi_ioremap_lock); 497 return; 498 } 499 acpi_os_drop_map_ref(map); 500 mutex_unlock(&acpi_ioremap_lock); 501 502 acpi_os_map_cleanup(map); 503 } 504 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 505 506 #ifdef ACPI_FUTURE_USAGE 507 acpi_status 508 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 509 { 510 if (!phys || !virt) 511 return AE_BAD_PARAMETER; 512 513 *phys = virt_to_phys(virt); 514 515 return AE_OK; 516 } 517 #endif 518 519 #define ACPI_MAX_OVERRIDE_LEN 100 520 521 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 522 523 acpi_status 524 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 525 acpi_string * new_val) 526 { 527 if (!init_val || !new_val) 528 return AE_BAD_PARAMETER; 529 530 *new_val = NULL; 531 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 532 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 533 acpi_os_name); 534 *new_val = acpi_os_name; 535 } 536 537 return AE_OK; 538 } 539 540 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 541 #include <linux/earlycpio.h> 542 #include <linux/memblock.h> 543 544 static u64 acpi_tables_addr; 545 static int all_tables_size; 546 547 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 548 u8 __init acpi_table_checksum(u8 *buffer, u32 length) 549 { 550 u8 sum = 0; 551 u8 *end = buffer + length; 552 553 while (buffer < end) 554 sum = (u8) (sum + *(buffer++)); 555 return sum; 556 } 557 558 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 559 static const char * const table_sigs[] = { 560 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 561 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 562 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 563 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 564 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 565 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 566 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 567 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 568 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 569 570 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 571 572 /* Must not increase 10 or needs code modification below */ 573 #define ACPI_OVERRIDE_TABLES 10 574 575 void __init acpi_initrd_override(void *data, size_t size) 576 { 577 int sig, no, table_nr = 0, total_offset = 0; 578 long offset = 0; 579 struct acpi_table_header *table; 580 char cpio_path[32] = "kernel/firmware/acpi/"; 581 struct cpio_data file; 582 struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES]; 583 char *p; 584 585 if (data == NULL || size == 0) 586 return; 587 588 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 589 file = find_cpio_data(cpio_path, data, size, &offset); 590 if (!file.data) 591 break; 592 593 data += offset; 594 size -= offset; 595 596 if (file.size < sizeof(struct acpi_table_header)) { 597 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 598 cpio_path, file.name); 599 continue; 600 } 601 602 table = file.data; 603 604 for (sig = 0; table_sigs[sig]; sig++) 605 if (!memcmp(table->signature, table_sigs[sig], 4)) 606 break; 607 608 if (!table_sigs[sig]) { 609 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 610 cpio_path, file.name); 611 continue; 612 } 613 if (file.size != table->length) { 614 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 615 cpio_path, file.name); 616 continue; 617 } 618 if (acpi_table_checksum(file.data, table->length)) { 619 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 620 cpio_path, file.name); 621 continue; 622 } 623 624 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 625 table->signature, cpio_path, file.name, table->length); 626 627 all_tables_size += table->length; 628 early_initrd_files[table_nr].data = file.data; 629 early_initrd_files[table_nr].size = file.size; 630 table_nr++; 631 } 632 if (table_nr == 0) 633 return; 634 635 acpi_tables_addr = 636 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 637 all_tables_size, PAGE_SIZE); 638 if (!acpi_tables_addr) { 639 WARN_ON(1); 640 return; 641 } 642 /* 643 * Only calling e820_add_reserve does not work and the 644 * tables are invalid (memory got used) later. 645 * memblock_reserve works as expected and the tables won't get modified. 646 * But it's not enough on X86 because ioremap will 647 * complain later (used by acpi_os_map_memory) that the pages 648 * that should get mapped are not marked "reserved". 649 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 650 * works fine. 651 */ 652 memblock_reserve(acpi_tables_addr, all_tables_size); 653 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 654 655 p = early_ioremap(acpi_tables_addr, all_tables_size); 656 657 for (no = 0; no < table_nr; no++) { 658 memcpy(p + total_offset, early_initrd_files[no].data, 659 early_initrd_files[no].size); 660 total_offset += early_initrd_files[no].size; 661 } 662 early_iounmap(p, all_tables_size); 663 } 664 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 665 666 static void acpi_table_taint(struct acpi_table_header *table) 667 { 668 pr_warn(PREFIX 669 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 670 table->signature, table->oem_table_id); 671 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 672 } 673 674 675 acpi_status 676 acpi_os_table_override(struct acpi_table_header * existing_table, 677 struct acpi_table_header ** new_table) 678 { 679 if (!existing_table || !new_table) 680 return AE_BAD_PARAMETER; 681 682 *new_table = NULL; 683 684 #ifdef CONFIG_ACPI_CUSTOM_DSDT 685 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 686 *new_table = (struct acpi_table_header *)AmlCode; 687 #endif 688 if (*new_table != NULL) 689 acpi_table_taint(existing_table); 690 return AE_OK; 691 } 692 693 acpi_status 694 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 695 acpi_physical_address *address, 696 u32 *table_length) 697 { 698 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 699 *table_length = 0; 700 *address = 0; 701 return AE_OK; 702 #else 703 int table_offset = 0; 704 struct acpi_table_header *table; 705 706 *table_length = 0; 707 *address = 0; 708 709 if (!acpi_tables_addr) 710 return AE_OK; 711 712 do { 713 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 714 WARN_ON(1); 715 return AE_OK; 716 } 717 718 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 719 ACPI_HEADER_SIZE); 720 721 if (table_offset + table->length > all_tables_size) { 722 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 723 WARN_ON(1); 724 return AE_OK; 725 } 726 727 table_offset += table->length; 728 729 if (memcmp(existing_table->signature, table->signature, 4)) { 730 acpi_os_unmap_memory(table, 731 ACPI_HEADER_SIZE); 732 continue; 733 } 734 735 /* Only override tables with matching oem id */ 736 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 737 ACPI_OEM_TABLE_ID_SIZE)) { 738 acpi_os_unmap_memory(table, 739 ACPI_HEADER_SIZE); 740 continue; 741 } 742 743 table_offset -= table->length; 744 *table_length = table->length; 745 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 746 *address = acpi_tables_addr + table_offset; 747 break; 748 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 749 750 if (*address != 0) 751 acpi_table_taint(existing_table); 752 return AE_OK; 753 #endif 754 } 755 756 static irqreturn_t acpi_irq(int irq, void *dev_id) 757 { 758 u32 handled; 759 760 handled = (*acpi_irq_handler) (acpi_irq_context); 761 762 if (handled) { 763 acpi_irq_handled++; 764 return IRQ_HANDLED; 765 } else { 766 acpi_irq_not_handled++; 767 return IRQ_NONE; 768 } 769 } 770 771 acpi_status 772 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 773 void *context) 774 { 775 unsigned int irq; 776 777 acpi_irq_stats_init(); 778 779 /* 780 * ACPI interrupts different from the SCI in our copy of the FADT are 781 * not supported. 782 */ 783 if (gsi != acpi_gbl_FADT.sci_interrupt) 784 return AE_BAD_PARAMETER; 785 786 if (acpi_irq_handler) 787 return AE_ALREADY_ACQUIRED; 788 789 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 790 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 791 gsi); 792 return AE_OK; 793 } 794 795 acpi_irq_handler = handler; 796 acpi_irq_context = context; 797 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) { 798 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 799 acpi_irq_handler = NULL; 800 return AE_NOT_ACQUIRED; 801 } 802 803 return AE_OK; 804 } 805 806 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 807 { 808 if (irq != acpi_gbl_FADT.sci_interrupt) 809 return AE_BAD_PARAMETER; 810 811 free_irq(irq, acpi_irq); 812 acpi_irq_handler = NULL; 813 814 return AE_OK; 815 } 816 817 /* 818 * Running in interpreter thread context, safe to sleep 819 */ 820 821 void acpi_os_sleep(u64 ms) 822 { 823 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 824 } 825 826 void acpi_os_stall(u32 us) 827 { 828 while (us) { 829 u32 delay = 1000; 830 831 if (delay > us) 832 delay = us; 833 udelay(delay); 834 touch_nmi_watchdog(); 835 us -= delay; 836 } 837 } 838 839 /* 840 * Support ACPI 3.0 AML Timer operand 841 * Returns 64-bit free-running, monotonically increasing timer 842 * with 100ns granularity 843 */ 844 u64 acpi_os_get_timer(void) 845 { 846 u64 time_ns = ktime_to_ns(ktime_get()); 847 do_div(time_ns, 100); 848 return time_ns; 849 } 850 851 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 852 { 853 u32 dummy; 854 855 if (!value) 856 value = &dummy; 857 858 *value = 0; 859 if (width <= 8) { 860 *(u8 *) value = inb(port); 861 } else if (width <= 16) { 862 *(u16 *) value = inw(port); 863 } else if (width <= 32) { 864 *(u32 *) value = inl(port); 865 } else { 866 BUG(); 867 } 868 869 return AE_OK; 870 } 871 872 EXPORT_SYMBOL(acpi_os_read_port); 873 874 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 875 { 876 if (width <= 8) { 877 outb(value, port); 878 } else if (width <= 16) { 879 outw(value, port); 880 } else if (width <= 32) { 881 outl(value, port); 882 } else { 883 BUG(); 884 } 885 886 return AE_OK; 887 } 888 889 EXPORT_SYMBOL(acpi_os_write_port); 890 891 #ifdef readq 892 static inline u64 read64(const volatile void __iomem *addr) 893 { 894 return readq(addr); 895 } 896 #else 897 static inline u64 read64(const volatile void __iomem *addr) 898 { 899 u64 l, h; 900 l = readl(addr); 901 h = readl(addr+4); 902 return l | (h << 32); 903 } 904 #endif 905 906 acpi_status 907 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 908 { 909 void __iomem *virt_addr; 910 unsigned int size = width / 8; 911 bool unmap = false; 912 u64 dummy; 913 914 rcu_read_lock(); 915 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 916 if (!virt_addr) { 917 rcu_read_unlock(); 918 virt_addr = acpi_os_ioremap(phys_addr, size); 919 if (!virt_addr) 920 return AE_BAD_ADDRESS; 921 unmap = true; 922 } 923 924 if (!value) 925 value = &dummy; 926 927 switch (width) { 928 case 8: 929 *(u8 *) value = readb(virt_addr); 930 break; 931 case 16: 932 *(u16 *) value = readw(virt_addr); 933 break; 934 case 32: 935 *(u32 *) value = readl(virt_addr); 936 break; 937 case 64: 938 *(u64 *) value = read64(virt_addr); 939 break; 940 default: 941 BUG(); 942 } 943 944 if (unmap) 945 iounmap(virt_addr); 946 else 947 rcu_read_unlock(); 948 949 return AE_OK; 950 } 951 952 #ifdef writeq 953 static inline void write64(u64 val, volatile void __iomem *addr) 954 { 955 writeq(val, addr); 956 } 957 #else 958 static inline void write64(u64 val, volatile void __iomem *addr) 959 { 960 writel(val, addr); 961 writel(val>>32, addr+4); 962 } 963 #endif 964 965 acpi_status 966 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 967 { 968 void __iomem *virt_addr; 969 unsigned int size = width / 8; 970 bool unmap = false; 971 972 rcu_read_lock(); 973 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 974 if (!virt_addr) { 975 rcu_read_unlock(); 976 virt_addr = acpi_os_ioremap(phys_addr, size); 977 if (!virt_addr) 978 return AE_BAD_ADDRESS; 979 unmap = true; 980 } 981 982 switch (width) { 983 case 8: 984 writeb(value, virt_addr); 985 break; 986 case 16: 987 writew(value, virt_addr); 988 break; 989 case 32: 990 writel(value, virt_addr); 991 break; 992 case 64: 993 write64(value, virt_addr); 994 break; 995 default: 996 BUG(); 997 } 998 999 if (unmap) 1000 iounmap(virt_addr); 1001 else 1002 rcu_read_unlock(); 1003 1004 return AE_OK; 1005 } 1006 1007 acpi_status 1008 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1009 u64 *value, u32 width) 1010 { 1011 int result, size; 1012 u32 value32; 1013 1014 if (!value) 1015 return AE_BAD_PARAMETER; 1016 1017 switch (width) { 1018 case 8: 1019 size = 1; 1020 break; 1021 case 16: 1022 size = 2; 1023 break; 1024 case 32: 1025 size = 4; 1026 break; 1027 default: 1028 return AE_ERROR; 1029 } 1030 1031 result = raw_pci_read(pci_id->segment, pci_id->bus, 1032 PCI_DEVFN(pci_id->device, pci_id->function), 1033 reg, size, &value32); 1034 *value = value32; 1035 1036 return (result ? AE_ERROR : AE_OK); 1037 } 1038 1039 acpi_status 1040 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1041 u64 value, u32 width) 1042 { 1043 int result, size; 1044 1045 switch (width) { 1046 case 8: 1047 size = 1; 1048 break; 1049 case 16: 1050 size = 2; 1051 break; 1052 case 32: 1053 size = 4; 1054 break; 1055 default: 1056 return AE_ERROR; 1057 } 1058 1059 result = raw_pci_write(pci_id->segment, pci_id->bus, 1060 PCI_DEVFN(pci_id->device, pci_id->function), 1061 reg, size, value); 1062 1063 return (result ? AE_ERROR : AE_OK); 1064 } 1065 1066 static void acpi_os_execute_deferred(struct work_struct *work) 1067 { 1068 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1069 1070 if (dpc->wait) 1071 acpi_os_wait_events_complete(); 1072 1073 dpc->function(dpc->context); 1074 kfree(dpc); 1075 } 1076 1077 /******************************************************************************* 1078 * 1079 * FUNCTION: acpi_os_execute 1080 * 1081 * PARAMETERS: Type - Type of the callback 1082 * Function - Function to be executed 1083 * Context - Function parameters 1084 * 1085 * RETURN: Status 1086 * 1087 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1088 * immediately executes function on a separate thread. 1089 * 1090 ******************************************************************************/ 1091 1092 static acpi_status __acpi_os_execute(acpi_execute_type type, 1093 acpi_osd_exec_callback function, void *context, int hp) 1094 { 1095 acpi_status status = AE_OK; 1096 struct acpi_os_dpc *dpc; 1097 struct workqueue_struct *queue; 1098 int ret; 1099 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1100 "Scheduling function [%p(%p)] for deferred execution.\n", 1101 function, context)); 1102 1103 /* 1104 * Allocate/initialize DPC structure. Note that this memory will be 1105 * freed by the callee. The kernel handles the work_struct list in a 1106 * way that allows us to also free its memory inside the callee. 1107 * Because we may want to schedule several tasks with different 1108 * parameters we can't use the approach some kernel code uses of 1109 * having a static work_struct. 1110 */ 1111 1112 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1113 if (!dpc) 1114 return AE_NO_MEMORY; 1115 1116 dpc->function = function; 1117 dpc->context = context; 1118 1119 /* 1120 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq 1121 * because the hotplug code may call driver .remove() functions, 1122 * which invoke flush_scheduled_work/acpi_os_wait_events_complete 1123 * to flush these workqueues. 1124 * 1125 * To prevent lockdep from complaining unnecessarily, make sure that 1126 * there is a different static lockdep key for each workqueue by using 1127 * INIT_WORK() for each of them separately. 1128 */ 1129 if (hp) { 1130 queue = kacpi_hotplug_wq; 1131 dpc->wait = 1; 1132 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1133 } else if (type == OSL_NOTIFY_HANDLER) { 1134 queue = kacpi_notify_wq; 1135 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1136 } else { 1137 queue = kacpid_wq; 1138 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1139 } 1140 1141 /* 1142 * On some machines, a software-initiated SMI causes corruption unless 1143 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1144 * typically it's done in GPE-related methods that are run via 1145 * workqueues, so we can avoid the known corruption cases by always 1146 * queueing on CPU 0. 1147 */ 1148 ret = queue_work_on(0, queue, &dpc->work); 1149 1150 if (!ret) { 1151 printk(KERN_ERR PREFIX 1152 "Call to queue_work() failed.\n"); 1153 status = AE_ERROR; 1154 kfree(dpc); 1155 } 1156 return status; 1157 } 1158 1159 acpi_status acpi_os_execute(acpi_execute_type type, 1160 acpi_osd_exec_callback function, void *context) 1161 { 1162 return __acpi_os_execute(type, function, context, 0); 1163 } 1164 EXPORT_SYMBOL(acpi_os_execute); 1165 1166 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function, 1167 void *context) 1168 { 1169 return __acpi_os_execute(0, function, context, 1); 1170 } 1171 EXPORT_SYMBOL(acpi_os_hotplug_execute); 1172 1173 void acpi_os_wait_events_complete(void) 1174 { 1175 flush_workqueue(kacpid_wq); 1176 flush_workqueue(kacpi_notify_wq); 1177 } 1178 1179 EXPORT_SYMBOL(acpi_os_wait_events_complete); 1180 1181 acpi_status 1182 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1183 { 1184 struct semaphore *sem = NULL; 1185 1186 sem = acpi_os_allocate(sizeof(struct semaphore)); 1187 if (!sem) 1188 return AE_NO_MEMORY; 1189 memset(sem, 0, sizeof(struct semaphore)); 1190 1191 sema_init(sem, initial_units); 1192 1193 *handle = (acpi_handle *) sem; 1194 1195 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1196 *handle, initial_units)); 1197 1198 return AE_OK; 1199 } 1200 1201 /* 1202 * TODO: A better way to delete semaphores? Linux doesn't have a 1203 * 'delete_semaphore()' function -- may result in an invalid 1204 * pointer dereference for non-synchronized consumers. Should 1205 * we at least check for blocked threads and signal/cancel them? 1206 */ 1207 1208 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1209 { 1210 struct semaphore *sem = (struct semaphore *)handle; 1211 1212 if (!sem) 1213 return AE_BAD_PARAMETER; 1214 1215 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1216 1217 BUG_ON(!list_empty(&sem->wait_list)); 1218 kfree(sem); 1219 sem = NULL; 1220 1221 return AE_OK; 1222 } 1223 1224 /* 1225 * TODO: Support for units > 1? 1226 */ 1227 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1228 { 1229 acpi_status status = AE_OK; 1230 struct semaphore *sem = (struct semaphore *)handle; 1231 long jiffies; 1232 int ret = 0; 1233 1234 if (!sem || (units < 1)) 1235 return AE_BAD_PARAMETER; 1236 1237 if (units > 1) 1238 return AE_SUPPORT; 1239 1240 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1241 handle, units, timeout)); 1242 1243 if (timeout == ACPI_WAIT_FOREVER) 1244 jiffies = MAX_SCHEDULE_TIMEOUT; 1245 else 1246 jiffies = msecs_to_jiffies(timeout); 1247 1248 ret = down_timeout(sem, jiffies); 1249 if (ret) 1250 status = AE_TIME; 1251 1252 if (ACPI_FAILURE(status)) { 1253 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1254 "Failed to acquire semaphore[%p|%d|%d], %s", 1255 handle, units, timeout, 1256 acpi_format_exception(status))); 1257 } else { 1258 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1259 "Acquired semaphore[%p|%d|%d]", handle, 1260 units, timeout)); 1261 } 1262 1263 return status; 1264 } 1265 1266 /* 1267 * TODO: Support for units > 1? 1268 */ 1269 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1270 { 1271 struct semaphore *sem = (struct semaphore *)handle; 1272 1273 if (!sem || (units < 1)) 1274 return AE_BAD_PARAMETER; 1275 1276 if (units > 1) 1277 return AE_SUPPORT; 1278 1279 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1280 units)); 1281 1282 up(sem); 1283 1284 return AE_OK; 1285 } 1286 1287 #ifdef ACPI_FUTURE_USAGE 1288 u32 acpi_os_get_line(char *buffer) 1289 { 1290 1291 #ifdef ENABLE_DEBUGGER 1292 if (acpi_in_debugger) { 1293 u32 chars; 1294 1295 kdb_read(buffer, sizeof(line_buf)); 1296 1297 /* remove the CR kdb includes */ 1298 chars = strlen(buffer) - 1; 1299 buffer[chars] = '\0'; 1300 } 1301 #endif 1302 1303 return 0; 1304 } 1305 #endif /* ACPI_FUTURE_USAGE */ 1306 1307 acpi_status acpi_os_signal(u32 function, void *info) 1308 { 1309 switch (function) { 1310 case ACPI_SIGNAL_FATAL: 1311 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1312 break; 1313 case ACPI_SIGNAL_BREAKPOINT: 1314 /* 1315 * AML Breakpoint 1316 * ACPI spec. says to treat it as a NOP unless 1317 * you are debugging. So if/when we integrate 1318 * AML debugger into the kernel debugger its 1319 * hook will go here. But until then it is 1320 * not useful to print anything on breakpoints. 1321 */ 1322 break; 1323 default: 1324 break; 1325 } 1326 1327 return AE_OK; 1328 } 1329 1330 static int __init acpi_os_name_setup(char *str) 1331 { 1332 char *p = acpi_os_name; 1333 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1334 1335 if (!str || !*str) 1336 return 0; 1337 1338 for (; count-- && str && *str; str++) { 1339 if (isalnum(*str) || *str == ' ' || *str == ':') 1340 *p++ = *str; 1341 else if (*str == '\'' || *str == '"') 1342 continue; 1343 else 1344 break; 1345 } 1346 *p = 0; 1347 1348 return 1; 1349 1350 } 1351 1352 __setup("acpi_os_name=", acpi_os_name_setup); 1353 1354 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1355 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1356 1357 struct osi_setup_entry { 1358 char string[OSI_STRING_LENGTH_MAX]; 1359 bool enable; 1360 }; 1361 1362 static struct osi_setup_entry 1363 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1364 {"Module Device", true}, 1365 {"Processor Device", true}, 1366 {"3.0 _SCP Extensions", true}, 1367 {"Processor Aggregator Device", true}, 1368 }; 1369 1370 void __init acpi_osi_setup(char *str) 1371 { 1372 struct osi_setup_entry *osi; 1373 bool enable = true; 1374 int i; 1375 1376 if (!acpi_gbl_create_osi_method) 1377 return; 1378 1379 if (str == NULL || *str == '\0') { 1380 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1381 acpi_gbl_create_osi_method = FALSE; 1382 return; 1383 } 1384 1385 if (*str == '!') { 1386 str++; 1387 if (*str == '\0') { 1388 osi_linux.default_disabling = 1; 1389 return; 1390 } else if (*str == '*') { 1391 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1392 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1393 osi = &osi_setup_entries[i]; 1394 osi->enable = false; 1395 } 1396 return; 1397 } 1398 enable = false; 1399 } 1400 1401 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1402 osi = &osi_setup_entries[i]; 1403 if (!strcmp(osi->string, str)) { 1404 osi->enable = enable; 1405 break; 1406 } else if (osi->string[0] == '\0') { 1407 osi->enable = enable; 1408 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1409 break; 1410 } 1411 } 1412 } 1413 1414 static void __init set_osi_linux(unsigned int enable) 1415 { 1416 if (osi_linux.enable != enable) 1417 osi_linux.enable = enable; 1418 1419 if (osi_linux.enable) 1420 acpi_osi_setup("Linux"); 1421 else 1422 acpi_osi_setup("!Linux"); 1423 1424 return; 1425 } 1426 1427 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1428 { 1429 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1430 osi_linux.dmi = 0; 1431 set_osi_linux(enable); 1432 1433 return; 1434 } 1435 1436 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1437 { 1438 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1439 1440 if (enable == -1) 1441 return; 1442 1443 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1444 set_osi_linux(enable); 1445 1446 return; 1447 } 1448 1449 /* 1450 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1451 * 1452 * empty string disables _OSI 1453 * string starting with '!' disables that string 1454 * otherwise string is added to list, augmenting built-in strings 1455 */ 1456 static void __init acpi_osi_setup_late(void) 1457 { 1458 struct osi_setup_entry *osi; 1459 char *str; 1460 int i; 1461 acpi_status status; 1462 1463 if (osi_linux.default_disabling) { 1464 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1465 1466 if (ACPI_SUCCESS(status)) 1467 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1468 } 1469 1470 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1471 osi = &osi_setup_entries[i]; 1472 str = osi->string; 1473 1474 if (*str == '\0') 1475 break; 1476 if (osi->enable) { 1477 status = acpi_install_interface(str); 1478 1479 if (ACPI_SUCCESS(status)) 1480 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1481 } else { 1482 status = acpi_remove_interface(str); 1483 1484 if (ACPI_SUCCESS(status)) 1485 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1486 } 1487 } 1488 } 1489 1490 static int __init osi_setup(char *str) 1491 { 1492 if (str && !strcmp("Linux", str)) 1493 acpi_cmdline_osi_linux(1); 1494 else if (str && !strcmp("!Linux", str)) 1495 acpi_cmdline_osi_linux(0); 1496 else 1497 acpi_osi_setup(str); 1498 1499 return 1; 1500 } 1501 1502 __setup("acpi_osi=", osi_setup); 1503 1504 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1505 static int __init acpi_serialize_setup(char *str) 1506 { 1507 printk(KERN_INFO PREFIX "serialize enabled\n"); 1508 1509 acpi_gbl_all_methods_serialized = TRUE; 1510 1511 return 1; 1512 } 1513 1514 __setup("acpi_serialize", acpi_serialize_setup); 1515 1516 /* Check of resource interference between native drivers and ACPI 1517 * OperationRegions (SystemIO and System Memory only). 1518 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1519 * in arbitrary AML code and can interfere with legacy drivers. 1520 * acpi_enforce_resources= can be set to: 1521 * 1522 * - strict (default) (2) 1523 * -> further driver trying to access the resources will not load 1524 * - lax (1) 1525 * -> further driver trying to access the resources will load, but you 1526 * get a system message that something might go wrong... 1527 * 1528 * - no (0) 1529 * -> ACPI Operation Region resources will not be registered 1530 * 1531 */ 1532 #define ENFORCE_RESOURCES_STRICT 2 1533 #define ENFORCE_RESOURCES_LAX 1 1534 #define ENFORCE_RESOURCES_NO 0 1535 1536 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1537 1538 static int __init acpi_enforce_resources_setup(char *str) 1539 { 1540 if (str == NULL || *str == '\0') 1541 return 0; 1542 1543 if (!strcmp("strict", str)) 1544 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1545 else if (!strcmp("lax", str)) 1546 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1547 else if (!strcmp("no", str)) 1548 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1549 1550 return 1; 1551 } 1552 1553 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1554 1555 /* Check for resource conflicts between ACPI OperationRegions and native 1556 * drivers */ 1557 int acpi_check_resource_conflict(const struct resource *res) 1558 { 1559 acpi_adr_space_type space_id; 1560 acpi_size length; 1561 u8 warn = 0; 1562 int clash = 0; 1563 1564 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1565 return 0; 1566 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1567 return 0; 1568 1569 if (res->flags & IORESOURCE_IO) 1570 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1571 else 1572 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1573 1574 length = resource_size(res); 1575 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1576 warn = 1; 1577 clash = acpi_check_address_range(space_id, res->start, length, warn); 1578 1579 if (clash) { 1580 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1581 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1582 printk(KERN_NOTICE "ACPI: This conflict may" 1583 " cause random problems and system" 1584 " instability\n"); 1585 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1586 " for this device, you should use it instead of" 1587 " the native driver\n"); 1588 } 1589 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1590 return -EBUSY; 1591 } 1592 return 0; 1593 } 1594 EXPORT_SYMBOL(acpi_check_resource_conflict); 1595 1596 int acpi_check_region(resource_size_t start, resource_size_t n, 1597 const char *name) 1598 { 1599 struct resource res = { 1600 .start = start, 1601 .end = start + n - 1, 1602 .name = name, 1603 .flags = IORESOURCE_IO, 1604 }; 1605 1606 return acpi_check_resource_conflict(&res); 1607 } 1608 EXPORT_SYMBOL(acpi_check_region); 1609 1610 /* 1611 * Let drivers know whether the resource checks are effective 1612 */ 1613 int acpi_resources_are_enforced(void) 1614 { 1615 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1616 } 1617 EXPORT_SYMBOL(acpi_resources_are_enforced); 1618 1619 /* 1620 * Deallocate the memory for a spinlock. 1621 */ 1622 void acpi_os_delete_lock(acpi_spinlock handle) 1623 { 1624 ACPI_FREE(handle); 1625 } 1626 1627 /* 1628 * Acquire a spinlock. 1629 * 1630 * handle is a pointer to the spinlock_t. 1631 */ 1632 1633 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1634 { 1635 acpi_cpu_flags flags; 1636 spin_lock_irqsave(lockp, flags); 1637 return flags; 1638 } 1639 1640 /* 1641 * Release a spinlock. See above. 1642 */ 1643 1644 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1645 { 1646 spin_unlock_irqrestore(lockp, flags); 1647 } 1648 1649 #ifndef ACPI_USE_LOCAL_CACHE 1650 1651 /******************************************************************************* 1652 * 1653 * FUNCTION: acpi_os_create_cache 1654 * 1655 * PARAMETERS: name - Ascii name for the cache 1656 * size - Size of each cached object 1657 * depth - Maximum depth of the cache (in objects) <ignored> 1658 * cache - Where the new cache object is returned 1659 * 1660 * RETURN: status 1661 * 1662 * DESCRIPTION: Create a cache object 1663 * 1664 ******************************************************************************/ 1665 1666 acpi_status 1667 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1668 { 1669 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1670 if (*cache == NULL) 1671 return AE_ERROR; 1672 else 1673 return AE_OK; 1674 } 1675 1676 /******************************************************************************* 1677 * 1678 * FUNCTION: acpi_os_purge_cache 1679 * 1680 * PARAMETERS: Cache - Handle to cache object 1681 * 1682 * RETURN: Status 1683 * 1684 * DESCRIPTION: Free all objects within the requested cache. 1685 * 1686 ******************************************************************************/ 1687 1688 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1689 { 1690 kmem_cache_shrink(cache); 1691 return (AE_OK); 1692 } 1693 1694 /******************************************************************************* 1695 * 1696 * FUNCTION: acpi_os_delete_cache 1697 * 1698 * PARAMETERS: Cache - Handle to cache object 1699 * 1700 * RETURN: Status 1701 * 1702 * DESCRIPTION: Free all objects within the requested cache and delete the 1703 * cache object. 1704 * 1705 ******************************************************************************/ 1706 1707 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1708 { 1709 kmem_cache_destroy(cache); 1710 return (AE_OK); 1711 } 1712 1713 /******************************************************************************* 1714 * 1715 * FUNCTION: acpi_os_release_object 1716 * 1717 * PARAMETERS: Cache - Handle to cache object 1718 * Object - The object to be released 1719 * 1720 * RETURN: None 1721 * 1722 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1723 * the object is deleted. 1724 * 1725 ******************************************************************************/ 1726 1727 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1728 { 1729 kmem_cache_free(cache, object); 1730 return (AE_OK); 1731 } 1732 #endif 1733 1734 static int __init acpi_no_auto_ssdt_setup(char *s) 1735 { 1736 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n"); 1737 1738 acpi_gbl_disable_ssdt_table_load = TRUE; 1739 1740 return 1; 1741 } 1742 1743 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); 1744 1745 acpi_status __init acpi_os_initialize(void) 1746 { 1747 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1748 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1749 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1750 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1751 1752 return AE_OK; 1753 } 1754 1755 acpi_status __init acpi_os_initialize1(void) 1756 { 1757 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1758 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1759 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1); 1760 BUG_ON(!kacpid_wq); 1761 BUG_ON(!kacpi_notify_wq); 1762 BUG_ON(!kacpi_hotplug_wq); 1763 acpi_install_interface_handler(acpi_osi_handler); 1764 acpi_osi_setup_late(); 1765 return AE_OK; 1766 } 1767 1768 acpi_status acpi_os_terminate(void) 1769 { 1770 if (acpi_irq_handler) { 1771 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1772 acpi_irq_handler); 1773 } 1774 1775 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1776 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1777 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1778 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1779 1780 destroy_workqueue(kacpid_wq); 1781 destroy_workqueue(kacpi_notify_wq); 1782 destroy_workqueue(kacpi_hotplug_wq); 1783 1784 return AE_OK; 1785 } 1786 1787 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1788 u32 pm1b_control) 1789 { 1790 int rc = 0; 1791 if (__acpi_os_prepare_sleep) 1792 rc = __acpi_os_prepare_sleep(sleep_state, 1793 pm1a_control, pm1b_control); 1794 if (rc < 0) 1795 return AE_ERROR; 1796 else if (rc > 0) 1797 return AE_CTRL_SKIP; 1798 1799 return AE_OK; 1800 } 1801 1802 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1803 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1804 { 1805 __acpi_os_prepare_sleep = func; 1806 } 1807 1808 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1809 u32 val_b) 1810 { 1811 int rc = 0; 1812 if (__acpi_os_prepare_extended_sleep) 1813 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1814 val_a, val_b); 1815 if (rc < 0) 1816 return AE_ERROR; 1817 else if (rc > 0) 1818 return AE_CTRL_SKIP; 1819 1820 return AE_OK; 1821 } 1822 1823 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1824 u32 val_a, u32 val_b)) 1825 { 1826 __acpi_os_prepare_extended_sleep = func; 1827 } 1828 1829 1830 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context, 1831 void (*func)(struct work_struct *work)) 1832 { 1833 struct acpi_hp_work *hp_work; 1834 int ret; 1835 1836 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); 1837 if (!hp_work) 1838 return; 1839 1840 hp_work->handle = handle; 1841 hp_work->type = type; 1842 hp_work->context = context; 1843 1844 INIT_WORK(&hp_work->work, func); 1845 ret = queue_work(kacpi_hotplug_wq, &hp_work->work); 1846 if (!ret) 1847 kfree(hp_work); 1848 } 1849 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work); 1850