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/pci.h> 35 #include <linux/interrupt.h> 36 #include <linux/kmod.h> 37 #include <linux/delay.h> 38 #include <linux/workqueue.h> 39 #include <linux/nmi.h> 40 #include <linux/acpi.h> 41 #include <linux/acpi_io.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 <acpi/acpi.h> 52 #include <acpi/acpi_bus.h> 53 #include <acpi/processor.h> 54 55 #define _COMPONENT ACPI_OS_SERVICES 56 ACPI_MODULE_NAME("osl"); 57 #define PREFIX "ACPI: " 58 struct acpi_os_dpc { 59 acpi_osd_exec_callback function; 60 void *context; 61 struct work_struct work; 62 int wait; 63 }; 64 65 #ifdef CONFIG_ACPI_CUSTOM_DSDT 66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 67 #endif 68 69 #ifdef ENABLE_DEBUGGER 70 #include <linux/kdb.h> 71 72 /* stuff for debugger support */ 73 int acpi_in_debugger; 74 EXPORT_SYMBOL(acpi_in_debugger); 75 76 extern char line_buf[80]; 77 #endif /*ENABLE_DEBUGGER */ 78 79 static acpi_osd_handler acpi_irq_handler; 80 static void *acpi_irq_context; 81 static struct workqueue_struct *kacpid_wq; 82 static struct workqueue_struct *kacpi_notify_wq; 83 struct workqueue_struct *kacpi_hotplug_wq; 84 EXPORT_SYMBOL(kacpi_hotplug_wq); 85 86 struct acpi_res_list { 87 resource_size_t start; 88 resource_size_t end; 89 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/ 90 char name[5]; /* only can have a length of 4 chars, make use of this 91 one instead of res->name, no need to kalloc then */ 92 struct list_head resource_list; 93 int count; 94 }; 95 96 static LIST_HEAD(resource_list_head); 97 static DEFINE_SPINLOCK(acpi_res_lock); 98 99 /* 100 * This list of permanent mappings is for memory that may be accessed from 101 * interrupt context, where we can't do the ioremap(). 102 */ 103 struct acpi_ioremap { 104 struct list_head list; 105 void __iomem *virt; 106 acpi_physical_address phys; 107 acpi_size size; 108 unsigned long refcount; 109 }; 110 111 static LIST_HEAD(acpi_ioremaps); 112 static DEFINE_MUTEX(acpi_ioremap_lock); 113 114 static void __init acpi_osi_setup_late(void); 115 116 /* 117 * The story of _OSI(Linux) 118 * 119 * From pre-history through Linux-2.6.22, 120 * Linux responded TRUE upon a BIOS OSI(Linux) query. 121 * 122 * Unfortunately, reference BIOS writers got wind of this 123 * and put OSI(Linux) in their example code, quickly exposing 124 * this string as ill-conceived and opening the door to 125 * an un-bounded number of BIOS incompatibilities. 126 * 127 * For example, OSI(Linux) was used on resume to re-POST a 128 * video card on one system, because Linux at that time 129 * could not do a speedy restore in its native driver. 130 * But then upon gaining quick native restore capability, 131 * Linux has no way to tell the BIOS to skip the time-consuming 132 * POST -- putting Linux at a permanent performance disadvantage. 133 * On another system, the BIOS writer used OSI(Linux) 134 * to infer native OS support for IPMI! On other systems, 135 * OSI(Linux) simply got in the way of Linux claiming to 136 * be compatible with other operating systems, exposing 137 * BIOS issues such as skipped device initialization. 138 * 139 * So "Linux" turned out to be a really poor chose of 140 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 141 * 142 * BIOS writers should NOT query _OSI(Linux) on future systems. 143 * Linux will complain on the console when it sees it, and return FALSE. 144 * To get Linux to return TRUE for your system will require 145 * a kernel source update to add a DMI entry, 146 * or boot with "acpi_osi=Linux" 147 */ 148 149 static struct osi_linux { 150 unsigned int enable:1; 151 unsigned int dmi:1; 152 unsigned int cmdline:1; 153 } osi_linux = {0, 0, 0}; 154 155 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 156 { 157 if (!strcmp("Linux", interface)) { 158 159 printk_once(KERN_NOTICE FW_BUG PREFIX 160 "BIOS _OSI(Linux) query %s%s\n", 161 osi_linux.enable ? "honored" : "ignored", 162 osi_linux.cmdline ? " via cmdline" : 163 osi_linux.dmi ? " via DMI" : ""); 164 } 165 166 return supported; 167 } 168 169 static void __init acpi_request_region (struct acpi_generic_address *addr, 170 unsigned int length, char *desc) 171 { 172 if (!addr->address || !length) 173 return; 174 175 /* Resources are never freed */ 176 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 177 request_region(addr->address, length, desc); 178 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 179 request_mem_region(addr->address, length, desc); 180 } 181 182 static int __init acpi_reserve_resources(void) 183 { 184 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 185 "ACPI PM1a_EVT_BLK"); 186 187 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 188 "ACPI PM1b_EVT_BLK"); 189 190 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 191 "ACPI PM1a_CNT_BLK"); 192 193 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 194 "ACPI PM1b_CNT_BLK"); 195 196 if (acpi_gbl_FADT.pm_timer_length == 4) 197 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 198 199 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 200 "ACPI PM2_CNT_BLK"); 201 202 /* Length of GPE blocks must be a non-negative multiple of 2 */ 203 204 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 205 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 206 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 207 208 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 209 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 210 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 211 212 return 0; 213 } 214 device_initcall(acpi_reserve_resources); 215 216 void acpi_os_printf(const char *fmt, ...) 217 { 218 va_list args; 219 va_start(args, fmt); 220 acpi_os_vprintf(fmt, args); 221 va_end(args); 222 } 223 224 void acpi_os_vprintf(const char *fmt, va_list args) 225 { 226 static char buffer[512]; 227 228 vsprintf(buffer, fmt, args); 229 230 #ifdef ENABLE_DEBUGGER 231 if (acpi_in_debugger) { 232 kdb_printf("%s", buffer); 233 } else { 234 printk(KERN_CONT "%s", buffer); 235 } 236 #else 237 printk(KERN_CONT "%s", buffer); 238 #endif 239 } 240 241 #ifdef CONFIG_KEXEC 242 static unsigned long acpi_rsdp; 243 static int __init setup_acpi_rsdp(char *arg) 244 { 245 acpi_rsdp = simple_strtoul(arg, NULL, 16); 246 return 0; 247 } 248 early_param("acpi_rsdp", setup_acpi_rsdp); 249 #endif 250 251 acpi_physical_address __init acpi_os_get_root_pointer(void) 252 { 253 #ifdef CONFIG_KEXEC 254 if (acpi_rsdp) 255 return acpi_rsdp; 256 #endif 257 258 if (efi_enabled) { 259 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 260 return efi.acpi20; 261 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 262 return efi.acpi; 263 else { 264 printk(KERN_ERR PREFIX 265 "System description tables not found\n"); 266 return 0; 267 } 268 } else { 269 acpi_physical_address pa = 0; 270 271 acpi_find_root_pointer(&pa); 272 return pa; 273 } 274 } 275 276 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 277 static struct acpi_ioremap * 278 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 279 { 280 struct acpi_ioremap *map; 281 282 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 283 if (map->phys <= phys && 284 phys + size <= map->phys + map->size) 285 return map; 286 287 return NULL; 288 } 289 290 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 291 static void __iomem * 292 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 293 { 294 struct acpi_ioremap *map; 295 296 map = acpi_map_lookup(phys, size); 297 if (map) 298 return map->virt + (phys - map->phys); 299 300 return NULL; 301 } 302 303 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 304 { 305 struct acpi_ioremap *map; 306 void __iomem *virt = NULL; 307 308 mutex_lock(&acpi_ioremap_lock); 309 map = acpi_map_lookup(phys, size); 310 if (map) { 311 virt = map->virt + (phys - map->phys); 312 map->refcount++; 313 } 314 mutex_unlock(&acpi_ioremap_lock); 315 return virt; 316 } 317 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 318 319 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 320 static struct acpi_ioremap * 321 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 322 { 323 struct acpi_ioremap *map; 324 325 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 326 if (map->virt <= virt && 327 virt + size <= map->virt + map->size) 328 return map; 329 330 return NULL; 331 } 332 333 void __iomem *__init_refok 334 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 335 { 336 struct acpi_ioremap *map; 337 void __iomem *virt; 338 acpi_physical_address pg_off; 339 acpi_size pg_sz; 340 341 if (phys > ULONG_MAX) { 342 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 343 return NULL; 344 } 345 346 if (!acpi_gbl_permanent_mmap) 347 return __acpi_map_table((unsigned long)phys, size); 348 349 mutex_lock(&acpi_ioremap_lock); 350 /* Check if there's a suitable mapping already. */ 351 map = acpi_map_lookup(phys, size); 352 if (map) { 353 map->refcount++; 354 goto out; 355 } 356 357 map = kzalloc(sizeof(*map), GFP_KERNEL); 358 if (!map) { 359 mutex_unlock(&acpi_ioremap_lock); 360 return NULL; 361 } 362 363 pg_off = round_down(phys, PAGE_SIZE); 364 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 365 virt = acpi_os_ioremap(pg_off, pg_sz); 366 if (!virt) { 367 mutex_unlock(&acpi_ioremap_lock); 368 kfree(map); 369 return NULL; 370 } 371 372 INIT_LIST_HEAD(&map->list); 373 map->virt = virt; 374 map->phys = pg_off; 375 map->size = pg_sz; 376 map->refcount = 1; 377 378 list_add_tail_rcu(&map->list, &acpi_ioremaps); 379 380 out: 381 mutex_unlock(&acpi_ioremap_lock); 382 return map->virt + (phys - map->phys); 383 } 384 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 385 386 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 387 { 388 if (!--map->refcount) 389 list_del_rcu(&map->list); 390 } 391 392 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 393 { 394 if (!map->refcount) { 395 synchronize_rcu(); 396 iounmap(map->virt); 397 kfree(map); 398 } 399 } 400 401 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 402 { 403 struct acpi_ioremap *map; 404 405 if (!acpi_gbl_permanent_mmap) { 406 __acpi_unmap_table(virt, size); 407 return; 408 } 409 410 mutex_lock(&acpi_ioremap_lock); 411 map = acpi_map_lookup_virt(virt, size); 412 if (!map) { 413 mutex_unlock(&acpi_ioremap_lock); 414 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 415 return; 416 } 417 acpi_os_drop_map_ref(map); 418 mutex_unlock(&acpi_ioremap_lock); 419 420 acpi_os_map_cleanup(map); 421 } 422 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 423 424 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 425 { 426 if (!acpi_gbl_permanent_mmap) 427 __acpi_unmap_table(virt, size); 428 } 429 430 static int acpi_os_map_generic_address(struct acpi_generic_address *addr) 431 { 432 void __iomem *virt; 433 434 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 435 return 0; 436 437 if (!addr->address || !addr->bit_width) 438 return -EINVAL; 439 440 virt = acpi_os_map_memory(addr->address, addr->bit_width / 8); 441 if (!virt) 442 return -EIO; 443 444 return 0; 445 } 446 447 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr) 448 { 449 struct acpi_ioremap *map; 450 451 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 452 return; 453 454 if (!addr->address || !addr->bit_width) 455 return; 456 457 mutex_lock(&acpi_ioremap_lock); 458 map = acpi_map_lookup(addr->address, addr->bit_width / 8); 459 if (!map) { 460 mutex_unlock(&acpi_ioremap_lock); 461 return; 462 } 463 acpi_os_drop_map_ref(map); 464 mutex_unlock(&acpi_ioremap_lock); 465 466 acpi_os_map_cleanup(map); 467 } 468 469 #ifdef ACPI_FUTURE_USAGE 470 acpi_status 471 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 472 { 473 if (!phys || !virt) 474 return AE_BAD_PARAMETER; 475 476 *phys = virt_to_phys(virt); 477 478 return AE_OK; 479 } 480 #endif 481 482 #define ACPI_MAX_OVERRIDE_LEN 100 483 484 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 485 486 acpi_status 487 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 488 acpi_string * new_val) 489 { 490 if (!init_val || !new_val) 491 return AE_BAD_PARAMETER; 492 493 *new_val = NULL; 494 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 495 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 496 acpi_os_name); 497 *new_val = acpi_os_name; 498 } 499 500 return AE_OK; 501 } 502 503 acpi_status 504 acpi_os_table_override(struct acpi_table_header * existing_table, 505 struct acpi_table_header ** new_table) 506 { 507 if (!existing_table || !new_table) 508 return AE_BAD_PARAMETER; 509 510 *new_table = NULL; 511 512 #ifdef CONFIG_ACPI_CUSTOM_DSDT 513 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 514 *new_table = (struct acpi_table_header *)AmlCode; 515 #endif 516 if (*new_table != NULL) { 517 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 518 "this is unsafe: tainting kernel\n", 519 existing_table->signature, 520 existing_table->oem_table_id); 521 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 522 } 523 return AE_OK; 524 } 525 526 static irqreturn_t acpi_irq(int irq, void *dev_id) 527 { 528 u32 handled; 529 530 handled = (*acpi_irq_handler) (acpi_irq_context); 531 532 if (handled) { 533 acpi_irq_handled++; 534 return IRQ_HANDLED; 535 } else { 536 acpi_irq_not_handled++; 537 return IRQ_NONE; 538 } 539 } 540 541 acpi_status 542 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 543 void *context) 544 { 545 unsigned int irq; 546 547 acpi_irq_stats_init(); 548 549 /* 550 * ACPI interrupts different from the SCI in our copy of the FADT are 551 * not supported. 552 */ 553 if (gsi != acpi_gbl_FADT.sci_interrupt) 554 return AE_BAD_PARAMETER; 555 556 if (acpi_irq_handler) 557 return AE_ALREADY_ACQUIRED; 558 559 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 560 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 561 gsi); 562 return AE_OK; 563 } 564 565 acpi_irq_handler = handler; 566 acpi_irq_context = context; 567 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 568 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 569 acpi_irq_handler = NULL; 570 return AE_NOT_ACQUIRED; 571 } 572 573 return AE_OK; 574 } 575 576 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 577 { 578 if (irq != acpi_gbl_FADT.sci_interrupt) 579 return AE_BAD_PARAMETER; 580 581 free_irq(irq, acpi_irq); 582 acpi_irq_handler = NULL; 583 584 return AE_OK; 585 } 586 587 /* 588 * Running in interpreter thread context, safe to sleep 589 */ 590 591 void acpi_os_sleep(u64 ms) 592 { 593 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 594 } 595 596 void acpi_os_stall(u32 us) 597 { 598 while (us) { 599 u32 delay = 1000; 600 601 if (delay > us) 602 delay = us; 603 udelay(delay); 604 touch_nmi_watchdog(); 605 us -= delay; 606 } 607 } 608 609 /* 610 * Support ACPI 3.0 AML Timer operand 611 * Returns 64-bit free-running, monotonically increasing timer 612 * with 100ns granularity 613 */ 614 u64 acpi_os_get_timer(void) 615 { 616 static u64 t; 617 618 #ifdef CONFIG_HPET 619 /* TBD: use HPET if available */ 620 #endif 621 622 #ifdef CONFIG_X86_PM_TIMER 623 /* TBD: default to PM timer if HPET was not available */ 624 #endif 625 if (!t) 626 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 627 628 return ++t; 629 } 630 631 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 632 { 633 u32 dummy; 634 635 if (!value) 636 value = &dummy; 637 638 *value = 0; 639 if (width <= 8) { 640 *(u8 *) value = inb(port); 641 } else if (width <= 16) { 642 *(u16 *) value = inw(port); 643 } else if (width <= 32) { 644 *(u32 *) value = inl(port); 645 } else { 646 BUG(); 647 } 648 649 return AE_OK; 650 } 651 652 EXPORT_SYMBOL(acpi_os_read_port); 653 654 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 655 { 656 if (width <= 8) { 657 outb(value, port); 658 } else if (width <= 16) { 659 outw(value, port); 660 } else if (width <= 32) { 661 outl(value, port); 662 } else { 663 BUG(); 664 } 665 666 return AE_OK; 667 } 668 669 EXPORT_SYMBOL(acpi_os_write_port); 670 671 acpi_status 672 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 673 { 674 void __iomem *virt_addr; 675 unsigned int size = width / 8; 676 bool unmap = false; 677 u32 dummy; 678 679 rcu_read_lock(); 680 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 681 if (!virt_addr) { 682 rcu_read_unlock(); 683 virt_addr = acpi_os_ioremap(phys_addr, size); 684 if (!virt_addr) 685 return AE_BAD_ADDRESS; 686 unmap = true; 687 } 688 689 if (!value) 690 value = &dummy; 691 692 switch (width) { 693 case 8: 694 *(u8 *) value = readb(virt_addr); 695 break; 696 case 16: 697 *(u16 *) value = readw(virt_addr); 698 break; 699 case 32: 700 *(u32 *) value = readl(virt_addr); 701 break; 702 default: 703 BUG(); 704 } 705 706 if (unmap) 707 iounmap(virt_addr); 708 else 709 rcu_read_unlock(); 710 711 return AE_OK; 712 } 713 714 acpi_status 715 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 716 { 717 void __iomem *virt_addr; 718 unsigned int size = width / 8; 719 bool unmap = false; 720 721 rcu_read_lock(); 722 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 723 if (!virt_addr) { 724 rcu_read_unlock(); 725 virt_addr = acpi_os_ioremap(phys_addr, size); 726 if (!virt_addr) 727 return AE_BAD_ADDRESS; 728 unmap = true; 729 } 730 731 switch (width) { 732 case 8: 733 writeb(value, virt_addr); 734 break; 735 case 16: 736 writew(value, virt_addr); 737 break; 738 case 32: 739 writel(value, virt_addr); 740 break; 741 default: 742 BUG(); 743 } 744 745 if (unmap) 746 iounmap(virt_addr); 747 else 748 rcu_read_unlock(); 749 750 return AE_OK; 751 } 752 753 acpi_status 754 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 755 u64 *value, u32 width) 756 { 757 int result, size; 758 u32 value32; 759 760 if (!value) 761 return AE_BAD_PARAMETER; 762 763 switch (width) { 764 case 8: 765 size = 1; 766 break; 767 case 16: 768 size = 2; 769 break; 770 case 32: 771 size = 4; 772 break; 773 default: 774 return AE_ERROR; 775 } 776 777 result = raw_pci_read(pci_id->segment, pci_id->bus, 778 PCI_DEVFN(pci_id->device, pci_id->function), 779 reg, size, &value32); 780 *value = value32; 781 782 return (result ? AE_ERROR : AE_OK); 783 } 784 785 acpi_status 786 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 787 u64 value, u32 width) 788 { 789 int result, size; 790 791 switch (width) { 792 case 8: 793 size = 1; 794 break; 795 case 16: 796 size = 2; 797 break; 798 case 32: 799 size = 4; 800 break; 801 default: 802 return AE_ERROR; 803 } 804 805 result = raw_pci_write(pci_id->segment, pci_id->bus, 806 PCI_DEVFN(pci_id->device, pci_id->function), 807 reg, size, value); 808 809 return (result ? AE_ERROR : AE_OK); 810 } 811 812 static void acpi_os_execute_deferred(struct work_struct *work) 813 { 814 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 815 816 if (dpc->wait) 817 acpi_os_wait_events_complete(NULL); 818 819 dpc->function(dpc->context); 820 kfree(dpc); 821 } 822 823 /******************************************************************************* 824 * 825 * FUNCTION: acpi_os_execute 826 * 827 * PARAMETERS: Type - Type of the callback 828 * Function - Function to be executed 829 * Context - Function parameters 830 * 831 * RETURN: Status 832 * 833 * DESCRIPTION: Depending on type, either queues function for deferred execution or 834 * immediately executes function on a separate thread. 835 * 836 ******************************************************************************/ 837 838 static acpi_status __acpi_os_execute(acpi_execute_type type, 839 acpi_osd_exec_callback function, void *context, int hp) 840 { 841 acpi_status status = AE_OK; 842 struct acpi_os_dpc *dpc; 843 struct workqueue_struct *queue; 844 int ret; 845 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 846 "Scheduling function [%p(%p)] for deferred execution.\n", 847 function, context)); 848 849 /* 850 * Allocate/initialize DPC structure. Note that this memory will be 851 * freed by the callee. The kernel handles the work_struct list in a 852 * way that allows us to also free its memory inside the callee. 853 * Because we may want to schedule several tasks with different 854 * parameters we can't use the approach some kernel code uses of 855 * having a static work_struct. 856 */ 857 858 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 859 if (!dpc) 860 return AE_NO_MEMORY; 861 862 dpc->function = function; 863 dpc->context = context; 864 865 /* 866 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq 867 * because the hotplug code may call driver .remove() functions, 868 * which invoke flush_scheduled_work/acpi_os_wait_events_complete 869 * to flush these workqueues. 870 */ 871 queue = hp ? kacpi_hotplug_wq : 872 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); 873 dpc->wait = hp ? 1 : 0; 874 875 if (queue == kacpi_hotplug_wq) 876 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 877 else if (queue == kacpi_notify_wq) 878 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 879 else 880 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 881 882 /* 883 * On some machines, a software-initiated SMI causes corruption unless 884 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 885 * typically it's done in GPE-related methods that are run via 886 * workqueues, so we can avoid the known corruption cases by always 887 * queueing on CPU 0. 888 */ 889 ret = queue_work_on(0, queue, &dpc->work); 890 891 if (!ret) { 892 printk(KERN_ERR PREFIX 893 "Call to queue_work() failed.\n"); 894 status = AE_ERROR; 895 kfree(dpc); 896 } 897 return status; 898 } 899 900 acpi_status acpi_os_execute(acpi_execute_type type, 901 acpi_osd_exec_callback function, void *context) 902 { 903 return __acpi_os_execute(type, function, context, 0); 904 } 905 EXPORT_SYMBOL(acpi_os_execute); 906 907 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function, 908 void *context) 909 { 910 return __acpi_os_execute(0, function, context, 1); 911 } 912 913 void acpi_os_wait_events_complete(void *context) 914 { 915 flush_workqueue(kacpid_wq); 916 flush_workqueue(kacpi_notify_wq); 917 } 918 919 EXPORT_SYMBOL(acpi_os_wait_events_complete); 920 921 acpi_status 922 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 923 { 924 struct semaphore *sem = NULL; 925 926 sem = acpi_os_allocate(sizeof(struct semaphore)); 927 if (!sem) 928 return AE_NO_MEMORY; 929 memset(sem, 0, sizeof(struct semaphore)); 930 931 sema_init(sem, initial_units); 932 933 *handle = (acpi_handle *) sem; 934 935 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 936 *handle, initial_units)); 937 938 return AE_OK; 939 } 940 941 /* 942 * TODO: A better way to delete semaphores? Linux doesn't have a 943 * 'delete_semaphore()' function -- may result in an invalid 944 * pointer dereference for non-synchronized consumers. Should 945 * we at least check for blocked threads and signal/cancel them? 946 */ 947 948 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 949 { 950 struct semaphore *sem = (struct semaphore *)handle; 951 952 if (!sem) 953 return AE_BAD_PARAMETER; 954 955 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 956 957 BUG_ON(!list_empty(&sem->wait_list)); 958 kfree(sem); 959 sem = NULL; 960 961 return AE_OK; 962 } 963 964 /* 965 * TODO: Support for units > 1? 966 */ 967 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 968 { 969 acpi_status status = AE_OK; 970 struct semaphore *sem = (struct semaphore *)handle; 971 long jiffies; 972 int ret = 0; 973 974 if (!sem || (units < 1)) 975 return AE_BAD_PARAMETER; 976 977 if (units > 1) 978 return AE_SUPPORT; 979 980 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 981 handle, units, timeout)); 982 983 if (timeout == ACPI_WAIT_FOREVER) 984 jiffies = MAX_SCHEDULE_TIMEOUT; 985 else 986 jiffies = msecs_to_jiffies(timeout); 987 988 ret = down_timeout(sem, jiffies); 989 if (ret) 990 status = AE_TIME; 991 992 if (ACPI_FAILURE(status)) { 993 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 994 "Failed to acquire semaphore[%p|%d|%d], %s", 995 handle, units, timeout, 996 acpi_format_exception(status))); 997 } else { 998 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 999 "Acquired semaphore[%p|%d|%d]", handle, 1000 units, timeout)); 1001 } 1002 1003 return status; 1004 } 1005 1006 /* 1007 * TODO: Support for units > 1? 1008 */ 1009 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1010 { 1011 struct semaphore *sem = (struct semaphore *)handle; 1012 1013 if (!sem || (units < 1)) 1014 return AE_BAD_PARAMETER; 1015 1016 if (units > 1) 1017 return AE_SUPPORT; 1018 1019 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1020 units)); 1021 1022 up(sem); 1023 1024 return AE_OK; 1025 } 1026 1027 #ifdef ACPI_FUTURE_USAGE 1028 u32 acpi_os_get_line(char *buffer) 1029 { 1030 1031 #ifdef ENABLE_DEBUGGER 1032 if (acpi_in_debugger) { 1033 u32 chars; 1034 1035 kdb_read(buffer, sizeof(line_buf)); 1036 1037 /* remove the CR kdb includes */ 1038 chars = strlen(buffer) - 1; 1039 buffer[chars] = '\0'; 1040 } 1041 #endif 1042 1043 return 0; 1044 } 1045 #endif /* ACPI_FUTURE_USAGE */ 1046 1047 acpi_status acpi_os_signal(u32 function, void *info) 1048 { 1049 switch (function) { 1050 case ACPI_SIGNAL_FATAL: 1051 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1052 break; 1053 case ACPI_SIGNAL_BREAKPOINT: 1054 /* 1055 * AML Breakpoint 1056 * ACPI spec. says to treat it as a NOP unless 1057 * you are debugging. So if/when we integrate 1058 * AML debugger into the kernel debugger its 1059 * hook will go here. But until then it is 1060 * not useful to print anything on breakpoints. 1061 */ 1062 break; 1063 default: 1064 break; 1065 } 1066 1067 return AE_OK; 1068 } 1069 1070 static int __init acpi_os_name_setup(char *str) 1071 { 1072 char *p = acpi_os_name; 1073 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1074 1075 if (!str || !*str) 1076 return 0; 1077 1078 for (; count-- && str && *str; str++) { 1079 if (isalnum(*str) || *str == ' ' || *str == ':') 1080 *p++ = *str; 1081 else if (*str == '\'' || *str == '"') 1082 continue; 1083 else 1084 break; 1085 } 1086 *p = 0; 1087 1088 return 1; 1089 1090 } 1091 1092 __setup("acpi_os_name=", acpi_os_name_setup); 1093 1094 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1095 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1096 1097 struct osi_setup_entry { 1098 char string[OSI_STRING_LENGTH_MAX]; 1099 bool enable; 1100 }; 1101 1102 static struct osi_setup_entry __initdata 1103 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = { 1104 {"Module Device", true}, 1105 {"Processor Device", true}, 1106 {"3.0 _SCP Extensions", true}, 1107 {"Processor Aggregator Device", true}, 1108 }; 1109 1110 void __init acpi_osi_setup(char *str) 1111 { 1112 struct osi_setup_entry *osi; 1113 bool enable = true; 1114 int i; 1115 1116 if (!acpi_gbl_create_osi_method) 1117 return; 1118 1119 if (str == NULL || *str == '\0') { 1120 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1121 acpi_gbl_create_osi_method = FALSE; 1122 return; 1123 } 1124 1125 if (*str == '!') { 1126 str++; 1127 enable = false; 1128 } 1129 1130 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1131 osi = &osi_setup_entries[i]; 1132 if (!strcmp(osi->string, str)) { 1133 osi->enable = enable; 1134 break; 1135 } else if (osi->string[0] == '\0') { 1136 osi->enable = enable; 1137 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1138 break; 1139 } 1140 } 1141 } 1142 1143 static void __init set_osi_linux(unsigned int enable) 1144 { 1145 if (osi_linux.enable != enable) 1146 osi_linux.enable = enable; 1147 1148 if (osi_linux.enable) 1149 acpi_osi_setup("Linux"); 1150 else 1151 acpi_osi_setup("!Linux"); 1152 1153 return; 1154 } 1155 1156 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1157 { 1158 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1159 osi_linux.dmi = 0; 1160 set_osi_linux(enable); 1161 1162 return; 1163 } 1164 1165 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1166 { 1167 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1168 1169 if (enable == -1) 1170 return; 1171 1172 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1173 set_osi_linux(enable); 1174 1175 return; 1176 } 1177 1178 /* 1179 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1180 * 1181 * empty string disables _OSI 1182 * string starting with '!' disables that string 1183 * otherwise string is added to list, augmenting built-in strings 1184 */ 1185 static void __init acpi_osi_setup_late(void) 1186 { 1187 struct osi_setup_entry *osi; 1188 char *str; 1189 int i; 1190 acpi_status status; 1191 1192 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1193 osi = &osi_setup_entries[i]; 1194 str = osi->string; 1195 1196 if (*str == '\0') 1197 break; 1198 if (osi->enable) { 1199 status = acpi_install_interface(str); 1200 1201 if (ACPI_SUCCESS(status)) 1202 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1203 } else { 1204 status = acpi_remove_interface(str); 1205 1206 if (ACPI_SUCCESS(status)) 1207 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1208 } 1209 } 1210 } 1211 1212 static int __init osi_setup(char *str) 1213 { 1214 if (str && !strcmp("Linux", str)) 1215 acpi_cmdline_osi_linux(1); 1216 else if (str && !strcmp("!Linux", str)) 1217 acpi_cmdline_osi_linux(0); 1218 else 1219 acpi_osi_setup(str); 1220 1221 return 1; 1222 } 1223 1224 __setup("acpi_osi=", osi_setup); 1225 1226 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1227 static int __init acpi_serialize_setup(char *str) 1228 { 1229 printk(KERN_INFO PREFIX "serialize enabled\n"); 1230 1231 acpi_gbl_all_methods_serialized = TRUE; 1232 1233 return 1; 1234 } 1235 1236 __setup("acpi_serialize", acpi_serialize_setup); 1237 1238 /* Check of resource interference between native drivers and ACPI 1239 * OperationRegions (SystemIO and System Memory only). 1240 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1241 * in arbitrary AML code and can interfere with legacy drivers. 1242 * acpi_enforce_resources= can be set to: 1243 * 1244 * - strict (default) (2) 1245 * -> further driver trying to access the resources will not load 1246 * - lax (1) 1247 * -> further driver trying to access the resources will load, but you 1248 * get a system message that something might go wrong... 1249 * 1250 * - no (0) 1251 * -> ACPI Operation Region resources will not be registered 1252 * 1253 */ 1254 #define ENFORCE_RESOURCES_STRICT 2 1255 #define ENFORCE_RESOURCES_LAX 1 1256 #define ENFORCE_RESOURCES_NO 0 1257 1258 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1259 1260 static int __init acpi_enforce_resources_setup(char *str) 1261 { 1262 if (str == NULL || *str == '\0') 1263 return 0; 1264 1265 if (!strcmp("strict", str)) 1266 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1267 else if (!strcmp("lax", str)) 1268 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1269 else if (!strcmp("no", str)) 1270 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1271 1272 return 1; 1273 } 1274 1275 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1276 1277 /* Check for resource conflicts between ACPI OperationRegions and native 1278 * drivers */ 1279 int acpi_check_resource_conflict(const struct resource *res) 1280 { 1281 struct acpi_res_list *res_list_elem; 1282 int ioport = 0, clash = 0; 1283 1284 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1285 return 0; 1286 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1287 return 0; 1288 1289 ioport = res->flags & IORESOURCE_IO; 1290 1291 spin_lock(&acpi_res_lock); 1292 list_for_each_entry(res_list_elem, &resource_list_head, 1293 resource_list) { 1294 if (ioport && (res_list_elem->resource_type 1295 != ACPI_ADR_SPACE_SYSTEM_IO)) 1296 continue; 1297 if (!ioport && (res_list_elem->resource_type 1298 != ACPI_ADR_SPACE_SYSTEM_MEMORY)) 1299 continue; 1300 1301 if (res->end < res_list_elem->start 1302 || res_list_elem->end < res->start) 1303 continue; 1304 clash = 1; 1305 break; 1306 } 1307 spin_unlock(&acpi_res_lock); 1308 1309 if (clash) { 1310 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1311 printk(KERN_WARNING "ACPI: resource %s %pR" 1312 " conflicts with ACPI region %s " 1313 "[%s 0x%zx-0x%zx]\n", 1314 res->name, res, res_list_elem->name, 1315 (res_list_elem->resource_type == 1316 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem", 1317 (size_t) res_list_elem->start, 1318 (size_t) res_list_elem->end); 1319 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1320 printk(KERN_NOTICE "ACPI: This conflict may" 1321 " cause random problems and system" 1322 " instability\n"); 1323 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1324 " for this device, you should use it instead of" 1325 " the native driver\n"); 1326 } 1327 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1328 return -EBUSY; 1329 } 1330 return 0; 1331 } 1332 EXPORT_SYMBOL(acpi_check_resource_conflict); 1333 1334 int acpi_check_region(resource_size_t start, resource_size_t n, 1335 const char *name) 1336 { 1337 struct resource res = { 1338 .start = start, 1339 .end = start + n - 1, 1340 .name = name, 1341 .flags = IORESOURCE_IO, 1342 }; 1343 1344 return acpi_check_resource_conflict(&res); 1345 } 1346 EXPORT_SYMBOL(acpi_check_region); 1347 1348 /* 1349 * Let drivers know whether the resource checks are effective 1350 */ 1351 int acpi_resources_are_enforced(void) 1352 { 1353 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1354 } 1355 EXPORT_SYMBOL(acpi_resources_are_enforced); 1356 1357 /* 1358 * Deallocate the memory for a spinlock. 1359 */ 1360 void acpi_os_delete_lock(acpi_spinlock handle) 1361 { 1362 ACPI_FREE(handle); 1363 } 1364 1365 /* 1366 * Acquire a spinlock. 1367 * 1368 * handle is a pointer to the spinlock_t. 1369 */ 1370 1371 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1372 { 1373 acpi_cpu_flags flags; 1374 spin_lock_irqsave(lockp, flags); 1375 return flags; 1376 } 1377 1378 /* 1379 * Release a spinlock. See above. 1380 */ 1381 1382 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1383 { 1384 spin_unlock_irqrestore(lockp, flags); 1385 } 1386 1387 #ifndef ACPI_USE_LOCAL_CACHE 1388 1389 /******************************************************************************* 1390 * 1391 * FUNCTION: acpi_os_create_cache 1392 * 1393 * PARAMETERS: name - Ascii name for the cache 1394 * size - Size of each cached object 1395 * depth - Maximum depth of the cache (in objects) <ignored> 1396 * cache - Where the new cache object is returned 1397 * 1398 * RETURN: status 1399 * 1400 * DESCRIPTION: Create a cache object 1401 * 1402 ******************************************************************************/ 1403 1404 acpi_status 1405 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1406 { 1407 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1408 if (*cache == NULL) 1409 return AE_ERROR; 1410 else 1411 return AE_OK; 1412 } 1413 1414 /******************************************************************************* 1415 * 1416 * FUNCTION: acpi_os_purge_cache 1417 * 1418 * PARAMETERS: Cache - Handle to cache object 1419 * 1420 * RETURN: Status 1421 * 1422 * DESCRIPTION: Free all objects within the requested cache. 1423 * 1424 ******************************************************************************/ 1425 1426 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1427 { 1428 kmem_cache_shrink(cache); 1429 return (AE_OK); 1430 } 1431 1432 /******************************************************************************* 1433 * 1434 * FUNCTION: acpi_os_delete_cache 1435 * 1436 * PARAMETERS: Cache - Handle to cache object 1437 * 1438 * RETURN: Status 1439 * 1440 * DESCRIPTION: Free all objects within the requested cache and delete the 1441 * cache object. 1442 * 1443 ******************************************************************************/ 1444 1445 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1446 { 1447 kmem_cache_destroy(cache); 1448 return (AE_OK); 1449 } 1450 1451 /******************************************************************************* 1452 * 1453 * FUNCTION: acpi_os_release_object 1454 * 1455 * PARAMETERS: Cache - Handle to cache object 1456 * Object - The object to be released 1457 * 1458 * RETURN: None 1459 * 1460 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1461 * the object is deleted. 1462 * 1463 ******************************************************************************/ 1464 1465 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1466 { 1467 kmem_cache_free(cache, object); 1468 return (AE_OK); 1469 } 1470 1471 static inline int acpi_res_list_add(struct acpi_res_list *res) 1472 { 1473 struct acpi_res_list *res_list_elem; 1474 1475 list_for_each_entry(res_list_elem, &resource_list_head, 1476 resource_list) { 1477 1478 if (res->resource_type == res_list_elem->resource_type && 1479 res->start == res_list_elem->start && 1480 res->end == res_list_elem->end) { 1481 1482 /* 1483 * The Region(addr,len) already exist in the list, 1484 * just increase the count 1485 */ 1486 1487 res_list_elem->count++; 1488 return 0; 1489 } 1490 } 1491 1492 res->count = 1; 1493 list_add(&res->resource_list, &resource_list_head); 1494 return 1; 1495 } 1496 1497 static inline void acpi_res_list_del(struct acpi_res_list *res) 1498 { 1499 struct acpi_res_list *res_list_elem; 1500 1501 list_for_each_entry(res_list_elem, &resource_list_head, 1502 resource_list) { 1503 1504 if (res->resource_type == res_list_elem->resource_type && 1505 res->start == res_list_elem->start && 1506 res->end == res_list_elem->end) { 1507 1508 /* 1509 * If the res count is decreased to 0, 1510 * remove and free it 1511 */ 1512 1513 if (--res_list_elem->count == 0) { 1514 list_del(&res_list_elem->resource_list); 1515 kfree(res_list_elem); 1516 } 1517 return; 1518 } 1519 } 1520 } 1521 1522 acpi_status 1523 acpi_os_invalidate_address( 1524 u8 space_id, 1525 acpi_physical_address address, 1526 acpi_size length) 1527 { 1528 struct acpi_res_list res; 1529 1530 switch (space_id) { 1531 case ACPI_ADR_SPACE_SYSTEM_IO: 1532 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1533 /* Only interference checks against SystemIO and SystemMemory 1534 are needed */ 1535 res.start = address; 1536 res.end = address + length - 1; 1537 res.resource_type = space_id; 1538 spin_lock(&acpi_res_lock); 1539 acpi_res_list_del(&res); 1540 spin_unlock(&acpi_res_lock); 1541 break; 1542 case ACPI_ADR_SPACE_PCI_CONFIG: 1543 case ACPI_ADR_SPACE_EC: 1544 case ACPI_ADR_SPACE_SMBUS: 1545 case ACPI_ADR_SPACE_CMOS: 1546 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1547 case ACPI_ADR_SPACE_DATA_TABLE: 1548 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1549 break; 1550 } 1551 return AE_OK; 1552 } 1553 1554 /****************************************************************************** 1555 * 1556 * FUNCTION: acpi_os_validate_address 1557 * 1558 * PARAMETERS: space_id - ACPI space ID 1559 * address - Physical address 1560 * length - Address length 1561 * 1562 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1563 * should return AE_AML_ILLEGAL_ADDRESS. 1564 * 1565 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1566 * the addresses accessed by AML operation regions. 1567 * 1568 *****************************************************************************/ 1569 1570 acpi_status 1571 acpi_os_validate_address ( 1572 u8 space_id, 1573 acpi_physical_address address, 1574 acpi_size length, 1575 char *name) 1576 { 1577 struct acpi_res_list *res; 1578 int added; 1579 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1580 return AE_OK; 1581 1582 switch (space_id) { 1583 case ACPI_ADR_SPACE_SYSTEM_IO: 1584 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1585 /* Only interference checks against SystemIO and SystemMemory 1586 are needed */ 1587 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL); 1588 if (!res) 1589 return AE_OK; 1590 /* ACPI names are fixed to 4 bytes, still better use strlcpy */ 1591 strlcpy(res->name, name, 5); 1592 res->start = address; 1593 res->end = address + length - 1; 1594 res->resource_type = space_id; 1595 spin_lock(&acpi_res_lock); 1596 added = acpi_res_list_add(res); 1597 spin_unlock(&acpi_res_lock); 1598 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, " 1599 "name: %s\n", added ? "Added" : "Already exist", 1600 (space_id == ACPI_ADR_SPACE_SYSTEM_IO) 1601 ? "SystemIO" : "System Memory", 1602 (unsigned long long)res->start, 1603 (unsigned long long)res->end, 1604 res->name); 1605 if (!added) 1606 kfree(res); 1607 break; 1608 case ACPI_ADR_SPACE_PCI_CONFIG: 1609 case ACPI_ADR_SPACE_EC: 1610 case ACPI_ADR_SPACE_SMBUS: 1611 case ACPI_ADR_SPACE_CMOS: 1612 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1613 case ACPI_ADR_SPACE_DATA_TABLE: 1614 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1615 break; 1616 } 1617 return AE_OK; 1618 } 1619 #endif 1620 1621 acpi_status __init acpi_os_initialize(void) 1622 { 1623 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1624 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1625 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1626 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1627 1628 return AE_OK; 1629 } 1630 1631 acpi_status __init acpi_os_initialize1(void) 1632 { 1633 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1634 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1635 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1); 1636 BUG_ON(!kacpid_wq); 1637 BUG_ON(!kacpi_notify_wq); 1638 BUG_ON(!kacpi_hotplug_wq); 1639 acpi_install_interface_handler(acpi_osi_handler); 1640 acpi_osi_setup_late(); 1641 return AE_OK; 1642 } 1643 1644 acpi_status acpi_os_terminate(void) 1645 { 1646 if (acpi_irq_handler) { 1647 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1648 acpi_irq_handler); 1649 } 1650 1651 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1652 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1653 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1654 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1655 1656 destroy_workqueue(kacpid_wq); 1657 destroy_workqueue(kacpi_notify_wq); 1658 destroy_workqueue(kacpi_hotplug_wq); 1659 1660 return AE_OK; 1661 } 1662