drivers/acpi/osl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   4  *
   5  *  Copyright (C) 2000       Andrew Henroid
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *  Copyright (c) 2008 Intel Corporation
   9  *   Author: Matthew Wilcox <willy@linux.intel.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/mm.h>
  16 #include <linux/highmem.h>
  17 #include <linux/pci.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/kmod.h>
  20 #include <linux/delay.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/nmi.h>
  23 #include <linux/acpi.h>
  24 #include <linux/efi.h>
  25 #include <linux/ioport.h>
  26 #include <linux/list.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/semaphore.h>
  29
  30 #include <asm/io.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/io-64-nonatomic-lo-hi.h>
  33
  34 #include "acpica/accommon.h"
  35 #include "acpica/acnamesp.h"
  36 #include "internal.h"
  37
  38 #define _COMPONENT              ACPI_OS_SERVICES
  39 ACPI_MODULE_NAME("osl");
  40
  41 struct acpi_os_dpc {
  42         acpi_osd_exec_callback function;
  43         void *context;
  44         struct work_struct work;
  45 };
  46
  47 #ifdef ENABLE_DEBUGGER
  48 #include <linux/kdb.h>
  49
  50 /* stuff for debugger support */
  51 int acpi_in_debugger;
  52 EXPORT_SYMBOL(acpi_in_debugger);
  53 #endif                          /*ENABLE_DEBUGGER */
  54
  55 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  56                                       u32 pm1b_ctrl);
  57 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  58                                       u32 val_b);
  59
  60 static acpi_osd_handler acpi_irq_handler;
  61 static void *acpi_irq_context;
  62 static struct workqueue_struct *kacpid_wq;
  63 static struct workqueue_struct *kacpi_notify_wq;
  64 static struct workqueue_struct *kacpi_hotplug_wq;
  65 static bool acpi_os_initialized;
  66 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
  67 bool acpi_permanent_mmap = false;
  68
  69 /*
  70  * This list of permanent mappings is for memory that may be accessed from
  71  * interrupt context, where we can't do the ioremap().
  72  */
  73 struct acpi_ioremap {
  74         struct list_head list;
  75         void __iomem *virt;
  76         acpi_physical_address phys;
  77         acpi_size size;
  78         unsigned long refcount;
  79 };
  80
  81 static LIST_HEAD(acpi_ioremaps);
  82 static DEFINE_MUTEX(acpi_ioremap_lock);
  83
  84 static void __init acpi_request_region (struct acpi_generic_address *gas,
  85         unsigned int length, char *desc)
  86 {
  87         u64 addr;
  88
  89         /* Handle possible alignment issues */
  90         memcpy(&addr, &gas->address, sizeof(addr));
  91         if (!addr || !length)
  92                 return;
  93
  94         /* Resources are never freed */
  95         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  96                 request_region(addr, length, desc);
  97         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  98                 request_mem_region(addr, length, desc);
  99 }
 100
 101 static int __init acpi_reserve_resources(void)
 102 {
 103         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 104                 "ACPI PM1a_EVT_BLK");
 105
 106         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 107                 "ACPI PM1b_EVT_BLK");
 108
 109         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 110                 "ACPI PM1a_CNT_BLK");
 111
 112         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 113                 "ACPI PM1b_CNT_BLK");
 114
 115         if (acpi_gbl_FADT.pm_timer_length == 4)
 116                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 117
 118         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 119                 "ACPI PM2_CNT_BLK");
 120
 121         /* Length of GPE blocks must be a non-negative multiple of 2 */
 122
 123         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 124                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 125                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 126
 127         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 128                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 129                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 130
 131         return 0;
 132 }
 133 fs_initcall_sync(acpi_reserve_resources);
 134
 135 void acpi_os_printf(const char *fmt, ...)
 136 {
 137         va_list args;
 138         va_start(args, fmt);
 139         acpi_os_vprintf(fmt, args);
 140         va_end(args);
 141 }
 142 EXPORT_SYMBOL(acpi_os_printf);
 143
 144 void acpi_os_vprintf(const char *fmt, va_list args)
 145 {
 146         static char buffer[512];
 147
 148         vsprintf(buffer, fmt, args);
 149
 150 #ifdef ENABLE_DEBUGGER
 151         if (acpi_in_debugger) {
 152                 kdb_printf("%s", buffer);
 153         } else {
 154                 if (printk_get_level(buffer))
 155                         printk("%s", buffer);
 156                 else
 157                         printk(KERN_CONT "%s", buffer);
 158         }
 159 #else
 160         if (acpi_debugger_write_log(buffer) < 0) {
 161                 if (printk_get_level(buffer))
 162                         printk("%s", buffer);
 163                 else
 164                         printk(KERN_CONT "%s", buffer);
 165         }
 166 #endif
 167 }
 168
 169 #ifdef CONFIG_KEXEC
 170 static unsigned long acpi_rsdp;
 171 static int __init setup_acpi_rsdp(char *arg)
 172 {
 173         return kstrtoul(arg, 16, &acpi_rsdp);
 174 }
 175 early_param("acpi_rsdp", setup_acpi_rsdp);
 176 #endif
 177
 178 acpi_physical_address __init acpi_os_get_root_pointer(void)
 179 {
 180         acpi_physical_address pa;
 181
 182 #ifdef CONFIG_KEXEC
 183         if (acpi_rsdp)
 184                 return acpi_rsdp;
 185 #endif
 186         pa = acpi_arch_get_root_pointer();
 187         if (pa)
 188                 return pa;
 189
 190         if (efi_enabled(EFI_CONFIG_TABLES)) {
 191                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 192                         return efi.acpi20;
 193                 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 194                         return efi.acpi;
 195                 pr_err(PREFIX "System description tables not found\n");
 196         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 197                 acpi_find_root_pointer(&pa);
 198         }
 199
 200         return pa;
 201 }
 202
 203 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 204 static struct acpi_ioremap *
 205 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 206 {
 207         struct acpi_ioremap *map;
 208
 209         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 210                 if (map->phys <= phys &&
 211                     phys + size <= map->phys + map->size)
 212                         return map;
 213
 214         return NULL;
 215 }
 216
 217 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 218 static void __iomem *
 219 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 220 {
 221         struct acpi_ioremap *map;
 222
 223         map = acpi_map_lookup(phys, size);
 224         if (map)
 225                 return map->virt + (phys - map->phys);
 226
 227         return NULL;
 228 }
 229
 230 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 231 {
 232         struct acpi_ioremap *map;
 233         void __iomem *virt = NULL;
 234
 235         mutex_lock(&acpi_ioremap_lock);
 236         map = acpi_map_lookup(phys, size);
 237         if (map) {
 238                 virt = map->virt + (phys - map->phys);
 239                 map->refcount++;
 240         }
 241         mutex_unlock(&acpi_ioremap_lock);
 242         return virt;
 243 }
 244 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 245
 246 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 247 static struct acpi_ioremap *
 248 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 249 {
 250         struct acpi_ioremap *map;
 251
 252         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 253                 if (map->virt <= virt &&
 254                     virt + size <= map->virt + map->size)
 255                         return map;
 256
 257         return NULL;
 258 }
 259
 260 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 261 /* ioremap will take care of cache attributes */
 262 #define should_use_kmap(pfn)   0
 263 #else
 264 #define should_use_kmap(pfn)   page_is_ram(pfn)
 265 #endif
 266
 267 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 268 {
 269         unsigned long pfn;
 270
 271         pfn = pg_off >> PAGE_SHIFT;
 272         if (should_use_kmap(pfn)) {
 273                 if (pg_sz > PAGE_SIZE)
 274                         return NULL;
 275                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 276         } else
 277                 return acpi_os_ioremap(pg_off, pg_sz);
 278 }
 279
 280 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 281 {
 282         unsigned long pfn;
 283
 284         pfn = pg_off >> PAGE_SHIFT;
 285         if (should_use_kmap(pfn))
 286                 kunmap(pfn_to_page(pfn));
 287         else
 288                 iounmap(vaddr);
 289 }
 290
 291 /**
 292  * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 293  * @phys: Start of the physical address range to map.
 294  * @size: Size of the physical address range to map.
 295  *
 296  * Look up the given physical address range in the list of existing ACPI memory
 297  * mappings.  If found, get a reference to it and return a pointer to it (its
 298  * virtual address).  If not found, map it, add it to that list and return a
 299  * pointer to it.
 300  *
 301  * During early init (when acpi_permanent_mmap has not been set yet) this
 302  * routine simply calls __acpi_map_table() to get the job done.
 303  */
 304 void __iomem __ref
 305 *acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 306 {
 307         struct acpi_ioremap *map;
 308         void __iomem *virt;
 309         acpi_physical_address pg_off;
 310         acpi_size pg_sz;
 311
 312         if (phys > ULONG_MAX) {
 313                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 314                 return NULL;
 315         }
 316
 317         if (!acpi_permanent_mmap)
 318                 return __acpi_map_table((unsigned long)phys, size);
 319
 320         mutex_lock(&acpi_ioremap_lock);
 321         /* Check if there's a suitable mapping already. */
 322         map = acpi_map_lookup(phys, size);
 323         if (map) {
 324                 map->refcount++;
 325                 goto out;
 326         }
 327
 328         map = kzalloc(sizeof(*map), GFP_KERNEL);
 329         if (!map) {
 330                 mutex_unlock(&acpi_ioremap_lock);
 331                 return NULL;
 332         }
 333
 334         pg_off = round_down(phys, PAGE_SIZE);
 335         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 336         virt = acpi_map(pg_off, pg_sz);
 337         if (!virt) {
 338                 mutex_unlock(&acpi_ioremap_lock);
 339                 kfree(map);
 340                 return NULL;
 341         }
 342
 343         INIT_LIST_HEAD(&map->list);
 344         map->virt = virt;
 345         map->phys = pg_off;
 346         map->size = pg_sz;
 347         map->refcount = 1;
 348
 349         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 350
 351 out:
 352         mutex_unlock(&acpi_ioremap_lock);
 353         return map->virt + (phys - map->phys);
 354 }
 355 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 356
 357 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 358 {
 359         return (void *)acpi_os_map_iomem(phys, size);
 360 }
 361 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 362
 363 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 364 {
 365         if (!--map->refcount)
 366                 list_del_rcu(&map->list);
 367 }
 368
 369 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 370 {
 371         if (!map->refcount) {
 372                 synchronize_rcu_expedited();
 373                 acpi_unmap(map->phys, map->virt);
 374                 kfree(map);
 375         }
 376 }
 377
 378 /**
 379  * acpi_os_unmap_iomem - Drop a memory mapping reference.
 380  * @virt: Start of the address range to drop a reference to.
 381  * @size: Size of the address range to drop a reference to.
 382  *
 383  * Look up the given virtual address range in the list of existing ACPI memory
 384  * mappings, drop a reference to it and unmap it if there are no more active
 385  * references to it.
 386  *
 387  * During early init (when acpi_permanent_mmap has not been set yet) this
 388  * routine simply calls __acpi_unmap_table() to get the job done.  Since
 389  * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 390  * here.
 391  */
 392 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 393 {
 394         struct acpi_ioremap *map;
 395
 396         if (!acpi_permanent_mmap) {
 397                 __acpi_unmap_table(virt, size);
 398                 return;
 399         }
 400
 401         mutex_lock(&acpi_ioremap_lock);
 402         map = acpi_map_lookup_virt(virt, size);
 403         if (!map) {
 404                 mutex_unlock(&acpi_ioremap_lock);
 405                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 406                 return;
 407         }
 408         acpi_os_drop_map_ref(map);
 409         mutex_unlock(&acpi_ioremap_lock);
 410
 411         acpi_os_map_cleanup(map);
 412 }
 413 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 414
 415 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 416 {
 417         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 418 }
 419 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 420
 421 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 422 {
 423         u64 addr;
 424         void __iomem *virt;
 425
 426         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 427                 return 0;
 428
 429         /* Handle possible alignment issues */
 430         memcpy(&addr, &gas->address, sizeof(addr));
 431         if (!addr || !gas->bit_width)
 432                 return -EINVAL;
 433
 434         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 435         if (!virt)
 436                 return -EIO;
 437
 438         return 0;
 439 }
 440 EXPORT_SYMBOL(acpi_os_map_generic_address);
 441
 442 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 443 {
 444         u64 addr;
 445         struct acpi_ioremap *map;
 446
 447         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 448                 return;
 449
 450         /* Handle possible alignment issues */
 451         memcpy(&addr, &gas->address, sizeof(addr));
 452         if (!addr || !gas->bit_width)
 453                 return;
 454
 455         mutex_lock(&acpi_ioremap_lock);
 456         map = acpi_map_lookup(addr, gas->bit_width / 8);
 457         if (!map) {
 458                 mutex_unlock(&acpi_ioremap_lock);
 459                 return;
 460         }
 461         acpi_os_drop_map_ref(map);
 462         mutex_unlock(&acpi_ioremap_lock);
 463
 464         acpi_os_map_cleanup(map);
 465 }
 466 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 467
 468 #ifdef ACPI_FUTURE_USAGE
 469 acpi_status
 470 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 471 {
 472         if (!phys || !virt)
 473                 return AE_BAD_PARAMETER;
 474
 475         *phys = virt_to_phys(virt);
 476
 477         return AE_OK;
 478 }
 479 #endif
 480
 481 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
 482 static bool acpi_rev_override;
 483
 484 int __init acpi_rev_override_setup(char *str)
 485 {
 486         acpi_rev_override = true;
 487         return 1;
 488 }
 489 __setup("acpi_rev_override", acpi_rev_override_setup);
 490 #else
 491 #define acpi_rev_override       false
 492 #endif
 493
 494 #define ACPI_MAX_OVERRIDE_LEN 100
 495
 496 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 497
 498 acpi_status
 499 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 500                             acpi_string *new_val)
 501 {
 502         if (!init_val || !new_val)
 503                 return AE_BAD_PARAMETER;
 504
 505         *new_val = NULL;
 506         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 507                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 508                        acpi_os_name);
 509                 *new_val = acpi_os_name;
 510         }
 511
 512         if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
 513                 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
 514                 *new_val = (char *)5;
 515         }
 516
 517         return AE_OK;
 518 }
 519
 520 static irqreturn_t acpi_irq(int irq, void *dev_id)
 521 {
 522         u32 handled;
 523
 524         handled = (*acpi_irq_handler) (acpi_irq_context);
 525
 526         if (handled) {
 527                 acpi_irq_handled++;
 528                 return IRQ_HANDLED;
 529         } else {
 530                 acpi_irq_not_handled++;
 531                 return IRQ_NONE;
 532         }
 533 }
 534
 535 acpi_status
 536 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 537                                   void *context)
 538 {
 539         unsigned int irq;
 540
 541         acpi_irq_stats_init();
 542
 543         /*
 544          * ACPI interrupts different from the SCI in our copy of the FADT are
 545          * not supported.
 546          */
 547         if (gsi != acpi_gbl_FADT.sci_interrupt)
 548                 return AE_BAD_PARAMETER;
 549
 550         if (acpi_irq_handler)
 551                 return AE_ALREADY_ACQUIRED;
 552
 553         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 554                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 555                        gsi);
 556                 return AE_OK;
 557         }
 558
 559         acpi_irq_handler = handler;
 560         acpi_irq_context = context;
 561         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 562                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 563                 acpi_irq_handler = NULL;
 564                 return AE_NOT_ACQUIRED;
 565         }
 566         acpi_sci_irq = irq;
 567
 568         return AE_OK;
 569 }
 570
 571 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
 572 {
 573         if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
 574                 return AE_BAD_PARAMETER;
 575
 576         free_irq(acpi_sci_irq, acpi_irq);
 577         acpi_irq_handler = NULL;
 578         acpi_sci_irq = INVALID_ACPI_IRQ;
 579
 580         return AE_OK;
 581 }
 582
 583 /*
 584  * Running in interpreter thread context, safe to sleep
 585  */
 586
 587 void acpi_os_sleep(u64 ms)
 588 {
 589         msleep(ms);
 590 }
 591
 592 void acpi_os_stall(u32 us)
 593 {
 594         while (us) {
 595                 u32 delay = 1000;
 596
 597                 if (delay > us)
 598                         delay = us;
 599                 udelay(delay);
 600                 touch_nmi_watchdog();
 601                 us -= delay;
 602         }
 603 }
 604
 605 /*
 606  * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
 607  * monotonically increasing timer with 100ns granularity. Do not use
 608  * ktime_get() to implement this function because this function may get
 609  * called after timekeeping has been suspended. Note: calling this function
 610  * after timekeeping has been suspended may lead to unexpected results
 611  * because when timekeeping is suspended the jiffies counter is not
 612  * incremented. See also timekeeping_suspend().
 613  */
 614 u64 acpi_os_get_timer(void)
 615 {
 616         return (get_jiffies_64() - INITIAL_JIFFIES) *
 617                 (ACPI_100NSEC_PER_SEC / HZ);
 618 }
 619
 620 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 621 {
 622         u32 dummy;
 623
 624         if (!value)
 625                 value = &dummy;
 626
 627         *value = 0;
 628         if (width <= 8) {
 629                 *(u8 *) value = inb(port);
 630         } else if (width <= 16) {
 631                 *(u16 *) value = inw(port);
 632         } else if (width <= 32) {
 633                 *(u32 *) value = inl(port);
 634         } else {
 635                 BUG();
 636         }
 637
 638         return AE_OK;
 639 }
 640
 641 EXPORT_SYMBOL(acpi_os_read_port);
 642
 643 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 644 {
 645         if (width <= 8) {
 646                 outb(value, port);
 647         } else if (width <= 16) {
 648                 outw(value, port);
 649         } else if (width <= 32) {
 650                 outl(value, port);
 651         } else {
 652                 BUG();
 653         }
 654
 655         return AE_OK;
 656 }
 657
 658 EXPORT_SYMBOL(acpi_os_write_port);
 659
 660 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
 661 {
 662
 663         switch (width) {
 664         case 8:
 665                 *(u8 *) value = readb(virt_addr);
 666                 break;
 667         case 16:
 668                 *(u16 *) value = readw(virt_addr);
 669                 break;
 670         case 32:
 671                 *(u32 *) value = readl(virt_addr);
 672                 break;
 673         case 64:
 674                 *(u64 *) value = readq(virt_addr);
 675                 break;
 676         default:
 677                 return -EINVAL;
 678         }
 679
 680         return 0;
 681 }
 682
 683 acpi_status
 684 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 685 {
 686         void __iomem *virt_addr;
 687         unsigned int size = width / 8;
 688         bool unmap = false;
 689         u64 dummy;
 690         int error;
 691
 692         rcu_read_lock();
 693         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 694         if (!virt_addr) {
 695                 rcu_read_unlock();
 696                 virt_addr = acpi_os_ioremap(phys_addr, size);
 697                 if (!virt_addr)
 698                         return AE_BAD_ADDRESS;
 699                 unmap = true;
 700         }
 701
 702         if (!value)
 703                 value = &dummy;
 704
 705         error = acpi_os_read_iomem(virt_addr, value, width);
 706         BUG_ON(error);
 707
 708         if (unmap)
 709                 iounmap(virt_addr);
 710         else
 711                 rcu_read_unlock();
 712
 713         return AE_OK;
 714 }
 715
 716 acpi_status
 717 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 718 {
 719         void __iomem *virt_addr;
 720         unsigned int size = width / 8;
 721         bool unmap = false;
 722
 723         rcu_read_lock();
 724         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 725         if (!virt_addr) {
 726                 rcu_read_unlock();
 727                 virt_addr = acpi_os_ioremap(phys_addr, size);
 728                 if (!virt_addr)
 729                         return AE_BAD_ADDRESS;
 730                 unmap = true;
 731         }
 732
 733         switch (width) {
 734         case 8:
 735                 writeb(value, virt_addr);
 736                 break;
 737         case 16:
 738                 writew(value, virt_addr);
 739                 break;
 740         case 32:
 741                 writel(value, virt_addr);
 742                 break;
 743         case 64:
 744                 writeq(value, virt_addr);
 745                 break;
 746         default:
 747                 BUG();
 748         }
 749
 750         if (unmap)
 751                 iounmap(virt_addr);
 752         else
 753                 rcu_read_unlock();
 754
 755         return AE_OK;
 756 }
 757
 758 #ifdef CONFIG_PCI
 759 acpi_status
 760 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 761                                u64 *value, u32 width)
 762 {
 763         int result, size;
 764         u32 value32;
 765
 766         if (!value)
 767                 return AE_BAD_PARAMETER;
 768
 769         switch (width) {
 770         case 8:
 771                 size = 1;
 772                 break;
 773         case 16:
 774                 size = 2;
 775                 break;
 776         case 32:
 777                 size = 4;
 778                 break;
 779         default:
 780                 return AE_ERROR;
 781         }
 782
 783         result = raw_pci_read(pci_id->segment, pci_id->bus,
 784                                 PCI_DEVFN(pci_id->device, pci_id->function),
 785                                 reg, size, &value32);
 786         *value = value32;
 787
 788         return (result ? AE_ERROR : AE_OK);
 789 }
 790
 791 acpi_status
 792 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 793                                 u64 value, u32 width)
 794 {
 795         int result, size;
 796
 797         switch (width) {
 798         case 8:
 799                 size = 1;
 800                 break;
 801         case 16:
 802                 size = 2;
 803                 break;
 804         case 32:
 805                 size = 4;
 806                 break;
 807         default:
 808                 return AE_ERROR;
 809         }
 810
 811         result = raw_pci_write(pci_id->segment, pci_id->bus,
 812                                 PCI_DEVFN(pci_id->device, pci_id->function),
 813                                 reg, size, value);
 814
 815         return (result ? AE_ERROR : AE_OK);
 816 }
 817 #endif
 818
 819 static void acpi_os_execute_deferred(struct work_struct *work)
 820 {
 821         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 822
 823         dpc->function(dpc->context);
 824         kfree(dpc);
 825 }
 826
 827 #ifdef CONFIG_ACPI_DEBUGGER
 828 static struct acpi_debugger acpi_debugger;
 829 static bool acpi_debugger_initialized;
 830
 831 int acpi_register_debugger(struct module *owner,
 832                            const struct acpi_debugger_ops *ops)
 833 {
 834         int ret = 0;
 835
 836         mutex_lock(&acpi_debugger.lock);
 837         if (acpi_debugger.ops) {
 838                 ret = -EBUSY;
 839                 goto err_lock;
 840         }
 841
 842         acpi_debugger.owner = owner;
 843         acpi_debugger.ops = ops;
 844
 845 err_lock:
 846         mutex_unlock(&acpi_debugger.lock);
 847         return ret;
 848 }
 849 EXPORT_SYMBOL(acpi_register_debugger);
 850
 851 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
 852 {
 853         mutex_lock(&acpi_debugger.lock);
 854         if (ops == acpi_debugger.ops) {
 855                 acpi_debugger.ops = NULL;
 856                 acpi_debugger.owner = NULL;
 857         }
 858         mutex_unlock(&acpi_debugger.lock);
 859 }
 860 EXPORT_SYMBOL(acpi_unregister_debugger);
 861
 862 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
 863 {
 864         int ret;
 865         int (*func)(acpi_osd_exec_callback, void *);
 866         struct module *owner;
 867
 868         if (!acpi_debugger_initialized)
 869                 return -ENODEV;
 870         mutex_lock(&acpi_debugger.lock);
 871         if (!acpi_debugger.ops) {
 872                 ret = -ENODEV;
 873                 goto err_lock;
 874         }
 875         if (!try_module_get(acpi_debugger.owner)) {
 876                 ret = -ENODEV;
 877                 goto err_lock;
 878         }
 879         func = acpi_debugger.ops->create_thread;
 880         owner = acpi_debugger.owner;
 881         mutex_unlock(&acpi_debugger.lock);
 882
 883         ret = func(function, context);
 884
 885         mutex_lock(&acpi_debugger.lock);
 886         module_put(owner);
 887 err_lock:
 888         mutex_unlock(&acpi_debugger.lock);
 889         return ret;
 890 }
 891
 892 ssize_t acpi_debugger_write_log(const char *msg)
 893 {
 894         ssize_t ret;
 895         ssize_t (*func)(const char *);
 896         struct module *owner;
 897
 898         if (!acpi_debugger_initialized)
 899                 return -ENODEV;
 900         mutex_lock(&acpi_debugger.lock);
 901         if (!acpi_debugger.ops) {
 902                 ret = -ENODEV;
 903                 goto err_lock;
 904         }
 905         if (!try_module_get(acpi_debugger.owner)) {
 906                 ret = -ENODEV;
 907                 goto err_lock;
 908         }
 909         func = acpi_debugger.ops->write_log;
 910         owner = acpi_debugger.owner;
 911         mutex_unlock(&acpi_debugger.lock);
 912
 913         ret = func(msg);
 914
 915         mutex_lock(&acpi_debugger.lock);
 916         module_put(owner);
 917 err_lock:
 918         mutex_unlock(&acpi_debugger.lock);
 919         return ret;
 920 }
 921
 922 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
 923 {
 924         ssize_t ret;
 925         ssize_t (*func)(char *, size_t);
 926         struct module *owner;
 927
 928         if (!acpi_debugger_initialized)
 929                 return -ENODEV;
 930         mutex_lock(&acpi_debugger.lock);
 931         if (!acpi_debugger.ops) {
 932                 ret = -ENODEV;
 933                 goto err_lock;
 934         }
 935         if (!try_module_get(acpi_debugger.owner)) {
 936                 ret = -ENODEV;
 937                 goto err_lock;
 938         }
 939         func = acpi_debugger.ops->read_cmd;
 940         owner = acpi_debugger.owner;
 941         mutex_unlock(&acpi_debugger.lock);
 942
 943         ret = func(buffer, buffer_length);
 944
 945         mutex_lock(&acpi_debugger.lock);
 946         module_put(owner);
 947 err_lock:
 948         mutex_unlock(&acpi_debugger.lock);
 949         return ret;
 950 }
 951
 952 int acpi_debugger_wait_command_ready(void)
 953 {
 954         int ret;
 955         int (*func)(bool, char *, size_t);
 956         struct module *owner;
 957
 958         if (!acpi_debugger_initialized)
 959                 return -ENODEV;
 960         mutex_lock(&acpi_debugger.lock);
 961         if (!acpi_debugger.ops) {
 962                 ret = -ENODEV;
 963                 goto err_lock;
 964         }
 965         if (!try_module_get(acpi_debugger.owner)) {
 966                 ret = -ENODEV;
 967                 goto err_lock;
 968         }
 969         func = acpi_debugger.ops->wait_command_ready;
 970         owner = acpi_debugger.owner;
 971         mutex_unlock(&acpi_debugger.lock);
 972
 973         ret = func(acpi_gbl_method_executing,
 974                    acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
 975
 976         mutex_lock(&acpi_debugger.lock);
 977         module_put(owner);
 978 err_lock:
 979         mutex_unlock(&acpi_debugger.lock);
 980         return ret;
 981 }
 982
 983 int acpi_debugger_notify_command_complete(void)
 984 {
 985         int ret;
 986         int (*func)(void);
 987         struct module *owner;
 988
 989         if (!acpi_debugger_initialized)
 990                 return -ENODEV;
 991         mutex_lock(&acpi_debugger.lock);
 992         if (!acpi_debugger.ops) {
 993                 ret = -ENODEV;
 994                 goto err_lock;
 995         }
 996         if (!try_module_get(acpi_debugger.owner)) {
 997                 ret = -ENODEV;
 998                 goto err_lock;
 999         }
1000         func = acpi_debugger.ops->notify_command_complete;
1001         owner = acpi_debugger.owner;
1002         mutex_unlock(&acpi_debugger.lock);
1003
1004         ret = func();
1005
1006         mutex_lock(&acpi_debugger.lock);
1007         module_put(owner);
1008 err_lock:
1009         mutex_unlock(&acpi_debugger.lock);
1010         return ret;
1011 }
1012
1013 int __init acpi_debugger_init(void)
1014 {
1015         mutex_init(&acpi_debugger.lock);
1016         acpi_debugger_initialized = true;
1017         return 0;
1018 }
1019 #endif
1020
1021 /*******************************************************************************
1022  *
1023  * FUNCTION:    acpi_os_execute
1024  *
1025  * PARAMETERS:  Type               - Type of the callback
1026  *              Function           - Function to be executed
1027  *              Context            - Function parameters
1028  *
1029  * RETURN:      Status
1030  *
1031  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1032  *              immediately executes function on a separate thread.
1033  *
1034  ******************************************************************************/
1035
1036 acpi_status acpi_os_execute(acpi_execute_type type,
1037                             acpi_osd_exec_callback function, void *context)
1038 {
1039         acpi_status status = AE_OK;
1040         struct acpi_os_dpc *dpc;
1041         struct workqueue_struct *queue;
1042         int ret;
1043         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1044                           "Scheduling function [%p(%p)] for deferred execution.\n",
1045                           function, context));
1046
1047         if (type == OSL_DEBUGGER_MAIN_THREAD) {
1048                 ret = acpi_debugger_create_thread(function, context);
1049                 if (ret) {
1050                         pr_err("Call to kthread_create() failed.\n");
1051                         status = AE_ERROR;
1052                 }
1053                 goto out_thread;
1054         }
1055
1056         /*
1057          * Allocate/initialize DPC structure.  Note that this memory will be
1058          * freed by the callee.  The kernel handles the work_struct list  in a
1059          * way that allows us to also free its memory inside the callee.
1060          * Because we may want to schedule several tasks with different
1061          * parameters we can't use the approach some kernel code uses of
1062          * having a static work_struct.
1063          */
1064
1065         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1066         if (!dpc)
1067                 return AE_NO_MEMORY;
1068
1069         dpc->function = function;
1070         dpc->context = context;
1071
1072         /*
1073          * To prevent lockdep from complaining unnecessarily, make sure that
1074          * there is a different static lockdep key for each workqueue by using
1075          * INIT_WORK() for each of them separately.
1076          */
1077         if (type == OSL_NOTIFY_HANDLER) {
1078                 queue = kacpi_notify_wq;
1079                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1080         } else if (type == OSL_GPE_HANDLER) {
1081                 queue = kacpid_wq;
1082                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1083         } else {
1084                 pr_err("Unsupported os_execute type %d.\n", type);
1085                 status = AE_ERROR;
1086         }
1087
1088         if (ACPI_FAILURE(status))
1089                 goto err_workqueue;
1090
1091         /*
1092          * On some machines, a software-initiated SMI causes corruption unless
1093          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1094          * typically it's done in GPE-related methods that are run via
1095          * workqueues, so we can avoid the known corruption cases by always
1096          * queueing on CPU 0.
1097          */
1098         ret = queue_work_on(0, queue, &dpc->work);
1099         if (!ret) {
1100                 printk(KERN_ERR PREFIX
1101                           "Call to queue_work() failed.\n");
1102                 status = AE_ERROR;
1103         }
1104 err_workqueue:
1105         if (ACPI_FAILURE(status))
1106                 kfree(dpc);
1107 out_thread:
1108         return status;
1109 }
1110 EXPORT_SYMBOL(acpi_os_execute);
1111
1112 void acpi_os_wait_events_complete(void)
1113 {
1114         /*
1115          * Make sure the GPE handler or the fixed event handler is not used
1116          * on another CPU after removal.
1117          */
1118         if (acpi_sci_irq_valid())
1119                 synchronize_hardirq(acpi_sci_irq);
1120         flush_workqueue(kacpid_wq);
1121         flush_workqueue(kacpi_notify_wq);
1122 }
1123 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1124
1125 struct acpi_hp_work {
1126         struct work_struct work;
1127         struct acpi_device *adev;
1128         u32 src;
1129 };
1130
1131 static void acpi_hotplug_work_fn(struct work_struct *work)
1132 {
1133         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1134
1135         acpi_os_wait_events_complete();
1136         acpi_device_hotplug(hpw->adev, hpw->src);
1137         kfree(hpw);
1138 }
1139
1140 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1141 {
1142         struct acpi_hp_work *hpw;
1143
1144         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1145                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1146                   adev, src));
1147
1148         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1149         if (!hpw)
1150                 return AE_NO_MEMORY;
1151
1152         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1153         hpw->adev = adev;
1154         hpw->src = src;
1155         /*
1156          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1157          * the hotplug code may call driver .remove() functions, which may
1158          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1159          * these workqueues.
1160          */
1161         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1162                 kfree(hpw);
1163                 return AE_ERROR;
1164         }
1165         return AE_OK;
1166 }
1167
1168 bool acpi_queue_hotplug_work(struct work_struct *work)
1169 {
1170         return queue_work(kacpi_hotplug_wq, work);
1171 }
1172
1173 acpi_status
1174 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1175 {
1176         struct semaphore *sem = NULL;
1177
1178         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1179         if (!sem)
1180                 return AE_NO_MEMORY;
1181
1182         sema_init(sem, initial_units);
1183
1184         *handle = (acpi_handle *) sem;
1185
1186         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1187                           *handle, initial_units));
1188
1189         return AE_OK;
1190 }
1191
1192 /*
1193  * TODO: A better way to delete semaphores?  Linux doesn't have a
1194  * 'delete_semaphore()' function -- may result in an invalid
1195  * pointer dereference for non-synchronized consumers.  Should
1196  * we at least check for blocked threads and signal/cancel them?
1197  */
1198
1199 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1200 {
1201         struct semaphore *sem = (struct semaphore *)handle;
1202
1203         if (!sem)
1204                 return AE_BAD_PARAMETER;
1205
1206         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1207
1208         BUG_ON(!list_empty(&sem->wait_list));
1209         kfree(sem);
1210         sem = NULL;
1211
1212         return AE_OK;
1213 }
1214
1215 /*
1216  * TODO: Support for units > 1?
1217  */
1218 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1219 {
1220         acpi_status status = AE_OK;
1221         struct semaphore *sem = (struct semaphore *)handle;
1222         long jiffies;
1223         int ret = 0;
1224
1225         if (!acpi_os_initialized)
1226                 return AE_OK;
1227
1228         if (!sem || (units < 1))
1229                 return AE_BAD_PARAMETER;
1230
1231         if (units > 1)
1232                 return AE_SUPPORT;
1233
1234         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1235                           handle, units, timeout));
1236
1237         if (timeout == ACPI_WAIT_FOREVER)
1238                 jiffies = MAX_SCHEDULE_TIMEOUT;
1239         else
1240                 jiffies = msecs_to_jiffies(timeout);
1241
1242         ret = down_timeout(sem, jiffies);
1243         if (ret)
1244                 status = AE_TIME;
1245
1246         if (ACPI_FAILURE(status)) {
1247                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1248                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1249                                   handle, units, timeout,
1250                                   acpi_format_exception(status)));
1251         } else {
1252                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1253                                   "Acquired semaphore[%p|%d|%d]", handle,
1254                                   units, timeout));
1255         }
1256
1257         return status;
1258 }
1259
1260 /*
1261  * TODO: Support for units > 1?
1262  */
1263 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1264 {
1265         struct semaphore *sem = (struct semaphore *)handle;
1266
1267         if (!acpi_os_initialized)
1268                 return AE_OK;
1269
1270         if (!sem || (units < 1))
1271                 return AE_BAD_PARAMETER;
1272
1273         if (units > 1)
1274                 return AE_SUPPORT;
1275
1276         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1277                           units));
1278
1279         up(sem);
1280
1281         return AE_OK;
1282 }
1283
1284 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1285 {
1286 #ifdef ENABLE_DEBUGGER
1287         if (acpi_in_debugger) {
1288                 u32 chars;
1289
1290                 kdb_read(buffer, buffer_length);
1291
1292                 /* remove the CR kdb includes */
1293                 chars = strlen(buffer) - 1;
1294                 buffer[chars] = '\0';
1295         }
1296 #else
1297         int ret;
1298
1299         ret = acpi_debugger_read_cmd(buffer, buffer_length);
1300         if (ret < 0)
1301                 return AE_ERROR;
1302         if (bytes_read)
1303                 *bytes_read = ret;
1304 #endif
1305
1306         return AE_OK;
1307 }
1308 EXPORT_SYMBOL(acpi_os_get_line);
1309
1310 acpi_status acpi_os_wait_command_ready(void)
1311 {
1312         int ret;
1313
1314         ret = acpi_debugger_wait_command_ready();
1315         if (ret < 0)
1316                 return AE_ERROR;
1317         return AE_OK;
1318 }
1319
1320 acpi_status acpi_os_notify_command_complete(void)
1321 {
1322         int ret;
1323
1324         ret = acpi_debugger_notify_command_complete();
1325         if (ret < 0)
1326                 return AE_ERROR;
1327         return AE_OK;
1328 }
1329
1330 acpi_status acpi_os_signal(u32 function, void *info)
1331 {
1332         switch (function) {
1333         case ACPI_SIGNAL_FATAL:
1334                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1335                 break;
1336         case ACPI_SIGNAL_BREAKPOINT:
1337                 /*
1338                  * AML Breakpoint
1339                  * ACPI spec. says to treat it as a NOP unless
1340                  * you are debugging.  So if/when we integrate
1341                  * AML debugger into the kernel debugger its
1342                  * hook will go here.  But until then it is
1343                  * not useful to print anything on breakpoints.
1344                  */
1345                 break;
1346         default:
1347                 break;
1348         }
1349
1350         return AE_OK;
1351 }
1352
1353 static int __init acpi_os_name_setup(char *str)
1354 {
1355         char *p = acpi_os_name;
1356         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1357
1358         if (!str || !*str)
1359                 return 0;
1360
1361         for (; count-- && *str; str++) {
1362                 if (isalnum(*str) || *str == ' ' || *str == ':')
1363                         *p++ = *str;
1364                 else if (*str == '\'' || *str == '"')
1365                         continue;
1366                 else
1367                         break;
1368         }
1369         *p = 0;
1370
1371         return 1;
1372
1373 }
1374
1375 __setup("acpi_os_name=", acpi_os_name_setup);
1376
1377 /*
1378  * Disable the auto-serialization of named objects creation methods.
1379  *
1380  * This feature is enabled by default.  It marks the AML control methods
1381  * that contain the opcodes to create named objects as "Serialized".
1382  */
1383 static int __init acpi_no_auto_serialize_setup(char *str)
1384 {
1385         acpi_gbl_auto_serialize_methods = FALSE;
1386         pr_info("ACPI: auto-serialization disabled\n");
1387
1388         return 1;
1389 }
1390
1391 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1392
1393 /* Check of resource interference between native drivers and ACPI
1394  * OperationRegions (SystemIO and System Memory only).
1395  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1396  * in arbitrary AML code and can interfere with legacy drivers.
1397  * acpi_enforce_resources= can be set to:
1398  *
1399  *   - strict (default) (2)
1400  *     -> further driver trying to access the resources will not load
1401  *   - lax              (1)
1402  *     -> further driver trying to access the resources will load, but you
1403  *     get a system message that something might go wrong...
1404  *
1405  *   - no               (0)
1406  *     -> ACPI Operation Region resources will not be registered
1407  *
1408  */
1409 #define ENFORCE_RESOURCES_STRICT 2
1410 #define ENFORCE_RESOURCES_LAX    1
1411 #define ENFORCE_RESOURCES_NO     0
1412
1413 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1414
1415 static int __init acpi_enforce_resources_setup(char *str)
1416 {
1417         if (str == NULL || *str == '\0')
1418                 return 0;
1419
1420         if (!strcmp("strict", str))
1421                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1422         else if (!strcmp("lax", str))
1423                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1424         else if (!strcmp("no", str))
1425                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1426
1427         return 1;
1428 }
1429
1430 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1431
1432 /* Check for resource conflicts between ACPI OperationRegions and native
1433  * drivers */
1434 int acpi_check_resource_conflict(const struct resource *res)
1435 {
1436         acpi_adr_space_type space_id;
1437         acpi_size length;
1438         u8 warn = 0;
1439         int clash = 0;
1440
1441         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1442                 return 0;
1443         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1444                 return 0;
1445
1446         if (res->flags & IORESOURCE_IO)
1447                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1448         else
1449                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1450
1451         length = resource_size(res);
1452         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1453                 warn = 1;
1454         clash = acpi_check_address_range(space_id, res->start, length, warn);
1455
1456         if (clash) {
1457                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1458                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1459                                 printk(KERN_NOTICE "ACPI: This conflict may"
1460                                        " cause random problems and system"
1461                                        " instability\n");
1462                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1463                                " for this device, you should use it instead of"
1464                                " the native driver\n");
1465                 }
1466                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1467                         return -EBUSY;
1468         }
1469         return 0;
1470 }
1471 EXPORT_SYMBOL(acpi_check_resource_conflict);
1472
1473 int acpi_check_region(resource_size_t start, resource_size_t n,
1474                       const char *name)
1475 {
1476         struct resource res = {
1477                 .start = start,
1478                 .end   = start + n - 1,
1479                 .name  = name,
1480                 .flags = IORESOURCE_IO,
1481         };
1482
1483         return acpi_check_resource_conflict(&res);
1484 }
1485 EXPORT_SYMBOL(acpi_check_region);
1486
1487 static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1488                                               void *_res, void **return_value)
1489 {
1490         struct acpi_mem_space_context **mem_ctx;
1491         union acpi_operand_object *handler_obj;
1492         union acpi_operand_object *region_obj2;
1493         union acpi_operand_object *region_obj;
1494         struct resource *res = _res;
1495         acpi_status status;
1496
1497         region_obj = acpi_ns_get_attached_object(handle);
1498         if (!region_obj)
1499                 return AE_OK;
1500
1501         handler_obj = region_obj->region.handler;
1502         if (!handler_obj)
1503                 return AE_OK;
1504
1505         if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1506                 return AE_OK;
1507
1508         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1509                 return AE_OK;
1510
1511         region_obj2 = acpi_ns_get_secondary_object(region_obj);
1512         if (!region_obj2)
1513                 return AE_OK;
1514
1515         mem_ctx = (void *)&region_obj2->extra.region_context;
1516
1517         if (!(mem_ctx[0]->address >= res->start &&
1518               mem_ctx[0]->address < res->end))
1519                 return AE_OK;
1520
1521         status = handler_obj->address_space.setup(region_obj,
1522                                                   ACPI_REGION_DEACTIVATE,
1523                                                   NULL, (void **)mem_ctx);
1524         if (ACPI_SUCCESS(status))
1525                 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1526
1527         return status;
1528 }
1529
1530 /**
1531  * acpi_release_memory - Release any mappings done to a memory region
1532  * @handle: Handle to namespace node
1533  * @res: Memory resource
1534  * @level: A level that terminates the search
1535  *
1536  * Walks through @handle and unmaps all SystemMemory Operation Regions that
1537  * overlap with @res and that have already been activated (mapped).
1538  *
1539  * This is a helper that allows drivers to place special requirements on memory
1540  * region that may overlap with operation regions, primarily allowing them to
1541  * safely map the region as non-cached memory.
1542  *
1543  * The unmapped Operation Regions will be automatically remapped next time they
1544  * are called, so the drivers do not need to do anything else.
1545  */
1546 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1547                                 u32 level)
1548 {
1549         if (!(res->flags & IORESOURCE_MEM))
1550                 return AE_TYPE;
1551
1552         return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1553                                    acpi_deactivate_mem_region, NULL, res, NULL);
1554 }
1555 EXPORT_SYMBOL_GPL(acpi_release_memory);
1556
1557 /*
1558  * Let drivers know whether the resource checks are effective
1559  */
1560 int acpi_resources_are_enforced(void)
1561 {
1562         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1563 }
1564 EXPORT_SYMBOL(acpi_resources_are_enforced);
1565
1566 /*
1567  * Deallocate the memory for a spinlock.
1568  */
1569 void acpi_os_delete_lock(acpi_spinlock handle)
1570 {
1571         ACPI_FREE(handle);
1572 }
1573
1574 /*
1575  * Acquire a spinlock.
1576  *
1577  * handle is a pointer to the spinlock_t.
1578  */
1579
1580 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1581 {
1582         acpi_cpu_flags flags;
1583         spin_lock_irqsave(lockp, flags);
1584         return flags;
1585 }
1586
1587 /*
1588  * Release a spinlock. See above.
1589  */
1590
1591 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1592 {
1593         spin_unlock_irqrestore(lockp, flags);
1594 }
1595
1596 #ifndef ACPI_USE_LOCAL_CACHE
1597
1598 /*******************************************************************************
1599  *
1600  * FUNCTION:    acpi_os_create_cache
1601  *
1602  * PARAMETERS:  name      - Ascii name for the cache
1603  *              size      - Size of each cached object
1604  *              depth     - Maximum depth of the cache (in objects) <ignored>
1605  *              cache     - Where the new cache object is returned
1606  *
1607  * RETURN:      status
1608  *
1609  * DESCRIPTION: Create a cache object
1610  *
1611  ******************************************************************************/
1612
1613 acpi_status
1614 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1615 {
1616         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1617         if (*cache == NULL)
1618                 return AE_ERROR;
1619         else
1620                 return AE_OK;
1621 }
1622
1623 /*******************************************************************************
1624  *
1625  * FUNCTION:    acpi_os_purge_cache
1626  *
1627  * PARAMETERS:  Cache           - Handle to cache object
1628  *
1629  * RETURN:      Status
1630  *
1631  * DESCRIPTION: Free all objects within the requested cache.
1632  *
1633  ******************************************************************************/
1634
1635 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1636 {
1637         kmem_cache_shrink(cache);
1638         return (AE_OK);
1639 }
1640
1641 /*******************************************************************************
1642  *
1643  * FUNCTION:    acpi_os_delete_cache
1644  *
1645  * PARAMETERS:  Cache           - Handle to cache object
1646  *
1647  * RETURN:      Status
1648  *
1649  * DESCRIPTION: Free all objects within the requested cache and delete the
1650  *              cache object.
1651  *
1652  ******************************************************************************/
1653
1654 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1655 {
1656         kmem_cache_destroy(cache);
1657         return (AE_OK);
1658 }
1659
1660 /*******************************************************************************
1661  *
1662  * FUNCTION:    acpi_os_release_object
1663  *
1664  * PARAMETERS:  Cache       - Handle to cache object
1665  *              Object      - The object to be released
1666  *
1667  * RETURN:      None
1668  *
1669  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1670  *              the object is deleted.
1671  *
1672  ******************************************************************************/
1673
1674 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1675 {
1676         kmem_cache_free(cache, object);
1677         return (AE_OK);
1678 }
1679 #endif
1680
1681 static int __init acpi_no_static_ssdt_setup(char *s)
1682 {
1683         acpi_gbl_disable_ssdt_table_install = TRUE;
1684         pr_info("ACPI: static SSDT installation disabled\n");
1685
1686         return 0;
1687 }
1688
1689 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1690
1691 static int __init acpi_disable_return_repair(char *s)
1692 {
1693         printk(KERN_NOTICE PREFIX
1694                "ACPI: Predefined validation mechanism disabled\n");
1695         acpi_gbl_disable_auto_repair = TRUE;
1696
1697         return 1;
1698 }
1699
1700 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1701
1702 acpi_status __init acpi_os_initialize(void)
1703 {
1704         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1705         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1706         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1707         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1708         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1709                 /*
1710                  * Use acpi_os_map_generic_address to pre-map the reset
1711                  * register if it's in system memory.
1712                  */
1713                 int rv;
1714
1715                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1716                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1717         }
1718         acpi_os_initialized = true;
1719
1720         return AE_OK;
1721 }
1722
1723 acpi_status __init acpi_os_initialize1(void)
1724 {
1725         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1726         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1727         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1728         BUG_ON(!kacpid_wq);
1729         BUG_ON(!kacpi_notify_wq);
1730         BUG_ON(!kacpi_hotplug_wq);
1731         acpi_osi_init();
1732         return AE_OK;
1733 }
1734
1735 acpi_status acpi_os_terminate(void)
1736 {
1737         if (acpi_irq_handler) {
1738                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1739                                                  acpi_irq_handler);
1740         }
1741
1742         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1743         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1744         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1745         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1746         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1747                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1748
1749         destroy_workqueue(kacpid_wq);
1750         destroy_workqueue(kacpi_notify_wq);
1751         destroy_workqueue(kacpi_hotplug_wq);
1752
1753         return AE_OK;
1754 }
1755
1756 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1757                                   u32 pm1b_control)
1758 {
1759         int rc = 0;
1760         if (__acpi_os_prepare_sleep)
1761                 rc = __acpi_os_prepare_sleep(sleep_state,
1762                                              pm1a_control, pm1b_control);
1763         if (rc < 0)
1764                 return AE_ERROR;
1765         else if (rc > 0)
1766                 return AE_CTRL_TERMINATE;
1767
1768         return AE_OK;
1769 }
1770
1771 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1772                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1773 {
1774         __acpi_os_prepare_sleep = func;
1775 }
1776
1777 #if (ACPI_REDUCED_HARDWARE)
1778 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1779                                   u32 val_b)
1780 {
1781         int rc = 0;
1782         if (__acpi_os_prepare_extended_sleep)
1783                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1784                                              val_a, val_b);
1785         if (rc < 0)
1786                 return AE_ERROR;
1787         else if (rc > 0)
1788                 return AE_CTRL_TERMINATE;
1789
1790         return AE_OK;
1791 }
1792 #else
1793 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1794                                   u32 val_b)
1795 {
1796         return AE_OK;
1797 }
1798 #endif
1799
1800 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1801                                u32 val_a, u32 val_b))
1802 {
1803         __acpi_os_prepare_extended_sleep = func;
1804 }
1805
1806 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1807                                 u32 reg_a_value, u32 reg_b_value)
1808 {
1809         acpi_status status;
1810
1811         if (acpi_gbl_reduced_hardware)
1812                 status = acpi_os_prepare_extended_sleep(sleep_state,
1813                                                         reg_a_value,
1814                                                         reg_b_value);
1815         else
1816                 status = acpi_os_prepare_sleep(sleep_state,
1817                                                reg_a_value, reg_b_value);
1818         return status;
1819 }