2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
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>
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/pci.h>
32 #include <linux/interrupt.h>
33 #include <linux/kmod.h>
34 #include <linux/delay.h>
35 #include <linux/workqueue.h>
36 #include <linux/nmi.h>
37 #include <linux/acpi.h>
38 #include <linux/efi.h>
39 #include <linux/ioport.h>
40 #include <linux/list.h>
41 #include <linux/jiffies.h>
42 #include <linux/semaphore.h>
45 #include <linux/uaccess.h>
46 #include <linux/io-64-nonatomic-lo-hi.h>
48 #include "acpica/accommon.h"
49 #include "acpica/acnamesp.h"
52 #define _COMPONENT ACPI_OS_SERVICES
53 ACPI_MODULE_NAME("osl");
56 acpi_osd_exec_callback function;
58 struct work_struct work;
61 #ifdef ENABLE_DEBUGGER
62 #include <linux/kdb.h>
64 /* stuff for debugger support */
66 EXPORT_SYMBOL(acpi_in_debugger);
67 #endif /*ENABLE_DEBUGGER */
69 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
71 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
74 static acpi_osd_handler acpi_irq_handler;
75 static void *acpi_irq_context;
76 static struct workqueue_struct *kacpid_wq;
77 static struct workqueue_struct *kacpi_notify_wq;
78 static struct workqueue_struct *kacpi_hotplug_wq;
79 static bool acpi_os_initialized;
80 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
81 bool acpi_permanent_mmap = false;
84 * This list of permanent mappings is for memory that may be accessed from
85 * interrupt context, where we can't do the ioremap().
88 struct list_head list;
90 acpi_physical_address phys;
92 unsigned long refcount;
95 static LIST_HEAD(acpi_ioremaps);
96 static DEFINE_MUTEX(acpi_ioremap_lock);
98 static void __init acpi_request_region (struct acpi_generic_address *gas,
99 unsigned int length, char *desc)
103 /* Handle possible alignment issues */
104 memcpy(&addr, &gas->address, sizeof(addr));
105 if (!addr || !length)
108 /* Resources are never freed */
109 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
110 request_region(addr, length, desc);
111 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
112 request_mem_region(addr, length, desc);
115 static int __init acpi_reserve_resources(void)
117 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
118 "ACPI PM1a_EVT_BLK");
120 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
121 "ACPI PM1b_EVT_BLK");
123 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
124 "ACPI PM1a_CNT_BLK");
126 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
127 "ACPI PM1b_CNT_BLK");
129 if (acpi_gbl_FADT.pm_timer_length == 4)
130 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
132 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
135 /* Length of GPE blocks must be a non-negative multiple of 2 */
137 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
138 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
139 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
141 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
142 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
143 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
147 fs_initcall_sync(acpi_reserve_resources);
149 void acpi_os_printf(const char *fmt, ...)
153 acpi_os_vprintf(fmt, args);
156 EXPORT_SYMBOL(acpi_os_printf);
158 void acpi_os_vprintf(const char *fmt, va_list args)
160 static char buffer[512];
162 vsprintf(buffer, fmt, args);
164 #ifdef ENABLE_DEBUGGER
165 if (acpi_in_debugger) {
166 kdb_printf("%s", buffer);
168 if (printk_get_level(buffer))
169 printk("%s", buffer);
171 printk(KERN_CONT "%s", buffer);
174 if (acpi_debugger_write_log(buffer) < 0) {
175 if (printk_get_level(buffer))
176 printk("%s", buffer);
178 printk(KERN_CONT "%s", buffer);
184 static unsigned long acpi_rsdp;
185 static int __init setup_acpi_rsdp(char *arg)
187 return kstrtoul(arg, 16, &acpi_rsdp);
189 early_param("acpi_rsdp", setup_acpi_rsdp);
192 acpi_physical_address __init acpi_os_get_root_pointer(void)
194 acpi_physical_address pa;
200 pa = acpi_arch_get_root_pointer();
204 if (efi_enabled(EFI_CONFIG_TABLES)) {
205 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
207 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
209 pr_err(PREFIX "System description tables not found\n");
210 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
211 acpi_find_root_pointer(&pa);
217 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
218 static struct acpi_ioremap *
219 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
221 struct acpi_ioremap *map;
223 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
224 if (map->phys <= phys &&
225 phys + size <= map->phys + map->size)
231 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
232 static void __iomem *
233 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
235 struct acpi_ioremap *map;
237 map = acpi_map_lookup(phys, size);
239 return map->virt + (phys - map->phys);
244 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
246 struct acpi_ioremap *map;
247 void __iomem *virt = NULL;
249 mutex_lock(&acpi_ioremap_lock);
250 map = acpi_map_lookup(phys, size);
252 virt = map->virt + (phys - map->phys);
255 mutex_unlock(&acpi_ioremap_lock);
258 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
260 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
261 static struct acpi_ioremap *
262 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
264 struct acpi_ioremap *map;
266 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
267 if (map->virt <= virt &&
268 virt + size <= map->virt + map->size)
274 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
275 /* ioremap will take care of cache attributes */
276 #define should_use_kmap(pfn) 0
278 #define should_use_kmap(pfn) page_is_ram(pfn)
281 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
285 pfn = pg_off >> PAGE_SHIFT;
286 if (should_use_kmap(pfn)) {
287 if (pg_sz > PAGE_SIZE)
289 return (void __iomem __force *)kmap(pfn_to_page(pfn));
291 return acpi_os_ioremap(pg_off, pg_sz);
294 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
298 pfn = pg_off >> PAGE_SHIFT;
299 if (should_use_kmap(pfn))
300 kunmap(pfn_to_page(pfn));
306 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
307 * @phys: Start of the physical address range to map.
308 * @size: Size of the physical address range to map.
310 * Look up the given physical address range in the list of existing ACPI memory
311 * mappings. If found, get a reference to it and return a pointer to it (its
312 * virtual address). If not found, map it, add it to that list and return a
315 * During early init (when acpi_permanent_mmap has not been set yet) this
316 * routine simply calls __acpi_map_table() to get the job done.
319 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
321 struct acpi_ioremap *map;
323 acpi_physical_address pg_off;
326 if (phys > ULONG_MAX) {
327 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
331 if (!acpi_permanent_mmap)
332 return __acpi_map_table((unsigned long)phys, size);
334 mutex_lock(&acpi_ioremap_lock);
335 /* Check if there's a suitable mapping already. */
336 map = acpi_map_lookup(phys, size);
342 map = kzalloc(sizeof(*map), GFP_KERNEL);
344 mutex_unlock(&acpi_ioremap_lock);
348 pg_off = round_down(phys, PAGE_SIZE);
349 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
350 virt = acpi_map(pg_off, pg_sz);
352 mutex_unlock(&acpi_ioremap_lock);
357 INIT_LIST_HEAD(&map->list);
363 list_add_tail_rcu(&map->list, &acpi_ioremaps);
366 mutex_unlock(&acpi_ioremap_lock);
367 return map->virt + (phys - map->phys);
369 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
371 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
373 return (void *)acpi_os_map_iomem(phys, size);
375 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
377 /* Must be called with mutex_lock(&acpi_ioremap_lock) */
378 static unsigned long acpi_os_drop_map_ref(struct acpi_ioremap *map)
380 unsigned long refcount = --map->refcount;
383 list_del_rcu(&map->list);
387 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
389 synchronize_rcu_expedited();
390 acpi_unmap(map->phys, map->virt);
395 * acpi_os_unmap_iomem - Drop a memory mapping reference.
396 * @virt: Start of the address range to drop a reference to.
397 * @size: Size of the address range to drop a reference to.
399 * Look up the given virtual address range in the list of existing ACPI memory
400 * mappings, drop a reference to it and unmap it if there are no more active
403 * During early init (when acpi_permanent_mmap has not been set yet) this
404 * routine simply calls __acpi_unmap_table() to get the job done. Since
405 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
408 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
410 struct acpi_ioremap *map;
411 unsigned long refcount;
413 if (!acpi_permanent_mmap) {
414 __acpi_unmap_table(virt, size);
418 mutex_lock(&acpi_ioremap_lock);
419 map = acpi_map_lookup_virt(virt, size);
421 mutex_unlock(&acpi_ioremap_lock);
422 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
425 refcount = acpi_os_drop_map_ref(map);
426 mutex_unlock(&acpi_ioremap_lock);
429 acpi_os_map_cleanup(map);
431 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
433 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
435 return acpi_os_unmap_iomem((void __iomem *)virt, size);
437 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
439 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
444 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
447 /* Handle possible alignment issues */
448 memcpy(&addr, &gas->address, sizeof(addr));
449 if (!addr || !gas->bit_width)
452 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
458 EXPORT_SYMBOL(acpi_os_map_generic_address);
460 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
463 struct acpi_ioremap *map;
464 unsigned long refcount;
466 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
469 /* Handle possible alignment issues */
470 memcpy(&addr, &gas->address, sizeof(addr));
471 if (!addr || !gas->bit_width)
474 mutex_lock(&acpi_ioremap_lock);
475 map = acpi_map_lookup(addr, gas->bit_width / 8);
477 mutex_unlock(&acpi_ioremap_lock);
480 refcount = acpi_os_drop_map_ref(map);
481 mutex_unlock(&acpi_ioremap_lock);
484 acpi_os_map_cleanup(map);
486 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
488 #ifdef ACPI_FUTURE_USAGE
490 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
493 return AE_BAD_PARAMETER;
495 *phys = virt_to_phys(virt);
501 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
502 static bool acpi_rev_override;
504 int __init acpi_rev_override_setup(char *str)
506 acpi_rev_override = true;
509 __setup("acpi_rev_override", acpi_rev_override_setup);
511 #define acpi_rev_override false
514 #define ACPI_MAX_OVERRIDE_LEN 100
516 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
520 acpi_string *new_val)
522 if (!init_val || !new_val)
523 return AE_BAD_PARAMETER;
526 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
527 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
529 *new_val = acpi_os_name;
532 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
533 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
534 *new_val = (char *)5;
540 static irqreturn_t acpi_irq(int irq, void *dev_id)
544 handled = (*acpi_irq_handler) (acpi_irq_context);
550 acpi_irq_not_handled++;
556 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
561 acpi_irq_stats_init();
564 * ACPI interrupts different from the SCI in our copy of the FADT are
567 if (gsi != acpi_gbl_FADT.sci_interrupt)
568 return AE_BAD_PARAMETER;
570 if (acpi_irq_handler)
571 return AE_ALREADY_ACQUIRED;
573 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
574 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
579 acpi_irq_handler = handler;
580 acpi_irq_context = context;
581 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
582 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
583 acpi_irq_handler = NULL;
584 return AE_NOT_ACQUIRED;
591 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
593 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
594 return AE_BAD_PARAMETER;
596 free_irq(acpi_sci_irq, acpi_irq);
597 acpi_irq_handler = NULL;
598 acpi_sci_irq = INVALID_ACPI_IRQ;
604 * Running in interpreter thread context, safe to sleep
607 void acpi_os_sleep(u64 ms)
612 void acpi_os_stall(u32 us)
620 touch_nmi_watchdog();
626 * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
627 * monotonically increasing timer with 100ns granularity. Do not use
628 * ktime_get() to implement this function because this function may get
629 * called after timekeeping has been suspended. Note: calling this function
630 * after timekeeping has been suspended may lead to unexpected results
631 * because when timekeeping is suspended the jiffies counter is not
632 * incremented. See also timekeeping_suspend().
634 u64 acpi_os_get_timer(void)
636 return (get_jiffies_64() - INITIAL_JIFFIES) *
637 (ACPI_100NSEC_PER_SEC / HZ);
640 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
649 *(u8 *) value = inb(port);
650 } else if (width <= 16) {
651 *(u16 *) value = inw(port);
652 } else if (width <= 32) {
653 *(u32 *) value = inl(port);
661 EXPORT_SYMBOL(acpi_os_read_port);
663 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
667 } else if (width <= 16) {
669 } else if (width <= 32) {
678 EXPORT_SYMBOL(acpi_os_write_port);
680 int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
685 *(u8 *) value = readb(virt_addr);
688 *(u16 *) value = readw(virt_addr);
691 *(u32 *) value = readl(virt_addr);
694 *(u64 *) value = readq(virt_addr);
704 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
706 void __iomem *virt_addr;
707 unsigned int size = width / 8;
713 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
716 virt_addr = acpi_os_ioremap(phys_addr, size);
718 return AE_BAD_ADDRESS;
725 error = acpi_os_read_iomem(virt_addr, value, width);
737 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
739 void __iomem *virt_addr;
740 unsigned int size = width / 8;
744 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
747 virt_addr = acpi_os_ioremap(phys_addr, size);
749 return AE_BAD_ADDRESS;
755 writeb(value, virt_addr);
758 writew(value, virt_addr);
761 writel(value, virt_addr);
764 writeq(value, virt_addr);
779 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
780 u64 *value, u32 width)
786 return AE_BAD_PARAMETER;
802 result = raw_pci_read(pci_id->segment, pci_id->bus,
803 PCI_DEVFN(pci_id->device, pci_id->function),
804 reg, size, &value32);
807 return (result ? AE_ERROR : AE_OK);
811 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
812 u64 value, u32 width)
830 result = raw_pci_write(pci_id->segment, pci_id->bus,
831 PCI_DEVFN(pci_id->device, pci_id->function),
834 return (result ? AE_ERROR : AE_OK);
837 static void acpi_os_execute_deferred(struct work_struct *work)
839 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
841 dpc->function(dpc->context);
845 #ifdef CONFIG_ACPI_DEBUGGER
846 static struct acpi_debugger acpi_debugger;
847 static bool acpi_debugger_initialized;
849 int acpi_register_debugger(struct module *owner,
850 const struct acpi_debugger_ops *ops)
854 mutex_lock(&acpi_debugger.lock);
855 if (acpi_debugger.ops) {
860 acpi_debugger.owner = owner;
861 acpi_debugger.ops = ops;
864 mutex_unlock(&acpi_debugger.lock);
867 EXPORT_SYMBOL(acpi_register_debugger);
869 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
871 mutex_lock(&acpi_debugger.lock);
872 if (ops == acpi_debugger.ops) {
873 acpi_debugger.ops = NULL;
874 acpi_debugger.owner = NULL;
876 mutex_unlock(&acpi_debugger.lock);
878 EXPORT_SYMBOL(acpi_unregister_debugger);
880 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
883 int (*func)(acpi_osd_exec_callback, void *);
884 struct module *owner;
886 if (!acpi_debugger_initialized)
888 mutex_lock(&acpi_debugger.lock);
889 if (!acpi_debugger.ops) {
893 if (!try_module_get(acpi_debugger.owner)) {
897 func = acpi_debugger.ops->create_thread;
898 owner = acpi_debugger.owner;
899 mutex_unlock(&acpi_debugger.lock);
901 ret = func(function, context);
903 mutex_lock(&acpi_debugger.lock);
906 mutex_unlock(&acpi_debugger.lock);
910 ssize_t acpi_debugger_write_log(const char *msg)
913 ssize_t (*func)(const char *);
914 struct module *owner;
916 if (!acpi_debugger_initialized)
918 mutex_lock(&acpi_debugger.lock);
919 if (!acpi_debugger.ops) {
923 if (!try_module_get(acpi_debugger.owner)) {
927 func = acpi_debugger.ops->write_log;
928 owner = acpi_debugger.owner;
929 mutex_unlock(&acpi_debugger.lock);
933 mutex_lock(&acpi_debugger.lock);
936 mutex_unlock(&acpi_debugger.lock);
940 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
943 ssize_t (*func)(char *, size_t);
944 struct module *owner;
946 if (!acpi_debugger_initialized)
948 mutex_lock(&acpi_debugger.lock);
949 if (!acpi_debugger.ops) {
953 if (!try_module_get(acpi_debugger.owner)) {
957 func = acpi_debugger.ops->read_cmd;
958 owner = acpi_debugger.owner;
959 mutex_unlock(&acpi_debugger.lock);
961 ret = func(buffer, buffer_length);
963 mutex_lock(&acpi_debugger.lock);
966 mutex_unlock(&acpi_debugger.lock);
970 int acpi_debugger_wait_command_ready(void)
973 int (*func)(bool, char *, size_t);
974 struct module *owner;
976 if (!acpi_debugger_initialized)
978 mutex_lock(&acpi_debugger.lock);
979 if (!acpi_debugger.ops) {
983 if (!try_module_get(acpi_debugger.owner)) {
987 func = acpi_debugger.ops->wait_command_ready;
988 owner = acpi_debugger.owner;
989 mutex_unlock(&acpi_debugger.lock);
991 ret = func(acpi_gbl_method_executing,
992 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
994 mutex_lock(&acpi_debugger.lock);
997 mutex_unlock(&acpi_debugger.lock);
1001 int acpi_debugger_notify_command_complete(void)
1005 struct module *owner;
1007 if (!acpi_debugger_initialized)
1009 mutex_lock(&acpi_debugger.lock);
1010 if (!acpi_debugger.ops) {
1014 if (!try_module_get(acpi_debugger.owner)) {
1018 func = acpi_debugger.ops->notify_command_complete;
1019 owner = acpi_debugger.owner;
1020 mutex_unlock(&acpi_debugger.lock);
1024 mutex_lock(&acpi_debugger.lock);
1027 mutex_unlock(&acpi_debugger.lock);
1031 int __init acpi_debugger_init(void)
1033 mutex_init(&acpi_debugger.lock);
1034 acpi_debugger_initialized = true;
1039 /*******************************************************************************
1041 * FUNCTION: acpi_os_execute
1043 * PARAMETERS: Type - Type of the callback
1044 * Function - Function to be executed
1045 * Context - Function parameters
1049 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1050 * immediately executes function on a separate thread.
1052 ******************************************************************************/
1054 acpi_status acpi_os_execute(acpi_execute_type type,
1055 acpi_osd_exec_callback function, void *context)
1057 acpi_status status = AE_OK;
1058 struct acpi_os_dpc *dpc;
1059 struct workqueue_struct *queue;
1061 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1062 "Scheduling function [%p(%p)] for deferred execution.\n",
1063 function, context));
1065 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1066 ret = acpi_debugger_create_thread(function, context);
1068 pr_err("Call to kthread_create() failed.\n");
1075 * Allocate/initialize DPC structure. Note that this memory will be
1076 * freed by the callee. The kernel handles the work_struct list in a
1077 * way that allows us to also free its memory inside the callee.
1078 * Because we may want to schedule several tasks with different
1079 * parameters we can't use the approach some kernel code uses of
1080 * having a static work_struct.
1083 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1085 return AE_NO_MEMORY;
1087 dpc->function = function;
1088 dpc->context = context;
1091 * To prevent lockdep from complaining unnecessarily, make sure that
1092 * there is a different static lockdep key for each workqueue by using
1093 * INIT_WORK() for each of them separately.
1095 if (type == OSL_NOTIFY_HANDLER) {
1096 queue = kacpi_notify_wq;
1097 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1098 } else if (type == OSL_GPE_HANDLER) {
1100 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1102 pr_err("Unsupported os_execute type %d.\n", type);
1106 if (ACPI_FAILURE(status))
1110 * On some machines, a software-initiated SMI causes corruption unless
1111 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1112 * typically it's done in GPE-related methods that are run via
1113 * workqueues, so we can avoid the known corruption cases by always
1114 * queueing on CPU 0.
1116 ret = queue_work_on(0, queue, &dpc->work);
1118 printk(KERN_ERR PREFIX
1119 "Call to queue_work() failed.\n");
1123 if (ACPI_FAILURE(status))
1128 EXPORT_SYMBOL(acpi_os_execute);
1130 void acpi_os_wait_events_complete(void)
1133 * Make sure the GPE handler or the fixed event handler is not used
1134 * on another CPU after removal.
1136 if (acpi_sci_irq_valid())
1137 synchronize_hardirq(acpi_sci_irq);
1138 flush_workqueue(kacpid_wq);
1139 flush_workqueue(kacpi_notify_wq);
1141 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1143 struct acpi_hp_work {
1144 struct work_struct work;
1145 struct acpi_device *adev;
1149 static void acpi_hotplug_work_fn(struct work_struct *work)
1151 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1153 acpi_os_wait_events_complete();
1154 acpi_device_hotplug(hpw->adev, hpw->src);
1158 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1160 struct acpi_hp_work *hpw;
1162 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1163 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1166 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1168 return AE_NO_MEMORY;
1170 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1174 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1175 * the hotplug code may call driver .remove() functions, which may
1176 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1179 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1186 bool acpi_queue_hotplug_work(struct work_struct *work)
1188 return queue_work(kacpi_hotplug_wq, work);
1192 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1194 struct semaphore *sem = NULL;
1196 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1198 return AE_NO_MEMORY;
1200 sema_init(sem, initial_units);
1202 *handle = (acpi_handle *) sem;
1204 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1205 *handle, initial_units));
1211 * TODO: A better way to delete semaphores? Linux doesn't have a
1212 * 'delete_semaphore()' function -- may result in an invalid
1213 * pointer dereference for non-synchronized consumers. Should
1214 * we at least check for blocked threads and signal/cancel them?
1217 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1219 struct semaphore *sem = (struct semaphore *)handle;
1222 return AE_BAD_PARAMETER;
1224 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1226 BUG_ON(!list_empty(&sem->wait_list));
1234 * TODO: Support for units > 1?
1236 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1238 acpi_status status = AE_OK;
1239 struct semaphore *sem = (struct semaphore *)handle;
1243 if (!acpi_os_initialized)
1246 if (!sem || (units < 1))
1247 return AE_BAD_PARAMETER;
1252 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1253 handle, units, timeout));
1255 if (timeout == ACPI_WAIT_FOREVER)
1256 jiffies = MAX_SCHEDULE_TIMEOUT;
1258 jiffies = msecs_to_jiffies(timeout);
1260 ret = down_timeout(sem, jiffies);
1264 if (ACPI_FAILURE(status)) {
1265 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1266 "Failed to acquire semaphore[%p|%d|%d], %s",
1267 handle, units, timeout,
1268 acpi_format_exception(status)));
1270 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1271 "Acquired semaphore[%p|%d|%d]", handle,
1279 * TODO: Support for units > 1?
1281 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1283 struct semaphore *sem = (struct semaphore *)handle;
1285 if (!acpi_os_initialized)
1288 if (!sem || (units < 1))
1289 return AE_BAD_PARAMETER;
1294 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1302 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1304 #ifdef ENABLE_DEBUGGER
1305 if (acpi_in_debugger) {
1308 kdb_read(buffer, buffer_length);
1310 /* remove the CR kdb includes */
1311 chars = strlen(buffer) - 1;
1312 buffer[chars] = '\0';
1317 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1326 EXPORT_SYMBOL(acpi_os_get_line);
1328 acpi_status acpi_os_wait_command_ready(void)
1332 ret = acpi_debugger_wait_command_ready();
1338 acpi_status acpi_os_notify_command_complete(void)
1342 ret = acpi_debugger_notify_command_complete();
1348 acpi_status acpi_os_signal(u32 function, void *info)
1351 case ACPI_SIGNAL_FATAL:
1352 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1354 case ACPI_SIGNAL_BREAKPOINT:
1357 * ACPI spec. says to treat it as a NOP unless
1358 * you are debugging. So if/when we integrate
1359 * AML debugger into the kernel debugger its
1360 * hook will go here. But until then it is
1361 * not useful to print anything on breakpoints.
1371 static int __init acpi_os_name_setup(char *str)
1373 char *p = acpi_os_name;
1374 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1379 for (; count-- && *str; str++) {
1380 if (isalnum(*str) || *str == ' ' || *str == ':')
1382 else if (*str == '\'' || *str == '"')
1393 __setup("acpi_os_name=", acpi_os_name_setup);
1396 * Disable the auto-serialization of named objects creation methods.
1398 * This feature is enabled by default. It marks the AML control methods
1399 * that contain the opcodes to create named objects as "Serialized".
1401 static int __init acpi_no_auto_serialize_setup(char *str)
1403 acpi_gbl_auto_serialize_methods = FALSE;
1404 pr_info("ACPI: auto-serialization disabled\n");
1409 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1411 /* Check of resource interference between native drivers and ACPI
1412 * OperationRegions (SystemIO and System Memory only).
1413 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1414 * in arbitrary AML code and can interfere with legacy drivers.
1415 * acpi_enforce_resources= can be set to:
1417 * - strict (default) (2)
1418 * -> further driver trying to access the resources will not load
1420 * -> further driver trying to access the resources will load, but you
1421 * get a system message that something might go wrong...
1424 * -> ACPI Operation Region resources will not be registered
1427 #define ENFORCE_RESOURCES_STRICT 2
1428 #define ENFORCE_RESOURCES_LAX 1
1429 #define ENFORCE_RESOURCES_NO 0
1431 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1433 static int __init acpi_enforce_resources_setup(char *str)
1435 if (str == NULL || *str == '\0')
1438 if (!strcmp("strict", str))
1439 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1440 else if (!strcmp("lax", str))
1441 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1442 else if (!strcmp("no", str))
1443 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1448 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1450 /* Check for resource conflicts between ACPI OperationRegions and native
1452 int acpi_check_resource_conflict(const struct resource *res)
1454 acpi_adr_space_type space_id;
1459 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1461 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1464 if (res->flags & IORESOURCE_IO)
1465 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1467 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1469 length = resource_size(res);
1470 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1472 clash = acpi_check_address_range(space_id, res->start, length, warn);
1475 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1476 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1477 printk(KERN_NOTICE "ACPI: This conflict may"
1478 " cause random problems and system"
1480 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1481 " for this device, you should use it instead of"
1482 " the native driver\n");
1484 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1489 EXPORT_SYMBOL(acpi_check_resource_conflict);
1491 int acpi_check_region(resource_size_t start, resource_size_t n,
1494 struct resource res = {
1496 .end = start + n - 1,
1498 .flags = IORESOURCE_IO,
1501 return acpi_check_resource_conflict(&res);
1503 EXPORT_SYMBOL(acpi_check_region);
1505 static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1506 void *_res, void **return_value)
1508 struct acpi_mem_space_context **mem_ctx;
1509 union acpi_operand_object *handler_obj;
1510 union acpi_operand_object *region_obj2;
1511 union acpi_operand_object *region_obj;
1512 struct resource *res = _res;
1515 region_obj = acpi_ns_get_attached_object(handle);
1519 handler_obj = region_obj->region.handler;
1523 if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1526 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1529 region_obj2 = acpi_ns_get_secondary_object(region_obj);
1533 mem_ctx = (void *)®ion_obj2->extra.region_context;
1535 if (!(mem_ctx[0]->address >= res->start &&
1536 mem_ctx[0]->address < res->end))
1539 status = handler_obj->address_space.setup(region_obj,
1540 ACPI_REGION_DEACTIVATE,
1541 NULL, (void **)mem_ctx);
1542 if (ACPI_SUCCESS(status))
1543 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1549 * acpi_release_memory - Release any mappings done to a memory region
1550 * @handle: Handle to namespace node
1551 * @res: Memory resource
1552 * @level: A level that terminates the search
1554 * Walks through @handle and unmaps all SystemMemory Operation Regions that
1555 * overlap with @res and that have already been activated (mapped).
1557 * This is a helper that allows drivers to place special requirements on memory
1558 * region that may overlap with operation regions, primarily allowing them to
1559 * safely map the region as non-cached memory.
1561 * The unmapped Operation Regions will be automatically remapped next time they
1562 * are called, so the drivers do not need to do anything else.
1564 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1567 if (!(res->flags & IORESOURCE_MEM))
1570 return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1571 acpi_deactivate_mem_region, NULL, res, NULL);
1573 EXPORT_SYMBOL_GPL(acpi_release_memory);
1576 * Let drivers know whether the resource checks are effective
1578 int acpi_resources_are_enforced(void)
1580 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1582 EXPORT_SYMBOL(acpi_resources_are_enforced);
1585 * Deallocate the memory for a spinlock.
1587 void acpi_os_delete_lock(acpi_spinlock handle)
1593 * Acquire a spinlock.
1595 * handle is a pointer to the spinlock_t.
1598 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1600 acpi_cpu_flags flags;
1601 spin_lock_irqsave(lockp, flags);
1606 * Release a spinlock. See above.
1609 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1611 spin_unlock_irqrestore(lockp, flags);
1614 #ifndef ACPI_USE_LOCAL_CACHE
1616 /*******************************************************************************
1618 * FUNCTION: acpi_os_create_cache
1620 * PARAMETERS: name - Ascii name for the cache
1621 * size - Size of each cached object
1622 * depth - Maximum depth of the cache (in objects) <ignored>
1623 * cache - Where the new cache object is returned
1627 * DESCRIPTION: Create a cache object
1629 ******************************************************************************/
1632 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1634 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1641 /*******************************************************************************
1643 * FUNCTION: acpi_os_purge_cache
1645 * PARAMETERS: Cache - Handle to cache object
1649 * DESCRIPTION: Free all objects within the requested cache.
1651 ******************************************************************************/
1653 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1655 kmem_cache_shrink(cache);
1659 /*******************************************************************************
1661 * FUNCTION: acpi_os_delete_cache
1663 * PARAMETERS: Cache - Handle to cache object
1667 * DESCRIPTION: Free all objects within the requested cache and delete the
1670 ******************************************************************************/
1672 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1674 kmem_cache_destroy(cache);
1678 /*******************************************************************************
1680 * FUNCTION: acpi_os_release_object
1682 * PARAMETERS: Cache - Handle to cache object
1683 * Object - The object to be released
1687 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1688 * the object is deleted.
1690 ******************************************************************************/
1692 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1694 kmem_cache_free(cache, object);
1699 static int __init acpi_no_static_ssdt_setup(char *s)
1701 acpi_gbl_disable_ssdt_table_install = TRUE;
1702 pr_info("ACPI: static SSDT installation disabled\n");
1707 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1709 static int __init acpi_disable_return_repair(char *s)
1711 printk(KERN_NOTICE PREFIX
1712 "ACPI: Predefined validation mechanism disabled\n");
1713 acpi_gbl_disable_auto_repair = TRUE;
1718 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1720 acpi_status __init acpi_os_initialize(void)
1722 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1723 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1724 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1725 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1726 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1728 * Use acpi_os_map_generic_address to pre-map the reset
1729 * register if it's in system memory.
1733 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1734 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1736 acpi_os_initialized = true;
1741 acpi_status __init acpi_os_initialize1(void)
1743 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1744 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1745 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1747 BUG_ON(!kacpi_notify_wq);
1748 BUG_ON(!kacpi_hotplug_wq);
1753 acpi_status acpi_os_terminate(void)
1755 if (acpi_irq_handler) {
1756 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1760 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1761 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1762 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1763 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1764 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1765 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1767 destroy_workqueue(kacpid_wq);
1768 destroy_workqueue(kacpi_notify_wq);
1769 destroy_workqueue(kacpi_hotplug_wq);
1774 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1778 if (__acpi_os_prepare_sleep)
1779 rc = __acpi_os_prepare_sleep(sleep_state,
1780 pm1a_control, pm1b_control);
1784 return AE_CTRL_TERMINATE;
1789 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1790 u32 pm1a_ctrl, u32 pm1b_ctrl))
1792 __acpi_os_prepare_sleep = func;
1795 #if (ACPI_REDUCED_HARDWARE)
1796 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1800 if (__acpi_os_prepare_extended_sleep)
1801 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1806 return AE_CTRL_TERMINATE;
1811 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1818 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1819 u32 val_a, u32 val_b))
1821 __acpi_os_prepare_extended_sleep = func;
1824 acpi_status acpi_os_enter_sleep(u8 sleep_state,
1825 u32 reg_a_value, u32 reg_b_value)
1829 if (acpi_gbl_reduced_hardware)
1830 status = acpi_os_prepare_extended_sleep(sleep_state,
1834 status = acpi_os_prepare_sleep(sleep_state,
1835 reg_a_value, reg_b_value);