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 <asm/uaccess.h>
46 #include <linux/io-64-nonatomic-lo-hi.h>
50 #define _COMPONENT ACPI_OS_SERVICES
51 ACPI_MODULE_NAME("osl");
54 acpi_osd_exec_callback function;
56 struct work_struct work;
59 #ifdef ENABLE_DEBUGGER
60 #include <linux/kdb.h>
62 /* stuff for debugger support */
64 EXPORT_SYMBOL(acpi_in_debugger);
65 #endif /*ENABLE_DEBUGGER */
67 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
69 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
72 static acpi_osd_handler acpi_irq_handler;
73 static void *acpi_irq_context;
74 static struct workqueue_struct *kacpid_wq;
75 static struct workqueue_struct *kacpi_notify_wq;
76 static struct workqueue_struct *kacpi_hotplug_wq;
77 static bool acpi_os_initialized;
78 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
81 * This list of permanent mappings is for memory that may be accessed from
82 * interrupt context, where we can't do the ioremap().
85 struct list_head list;
87 acpi_physical_address phys;
89 unsigned long refcount;
92 static LIST_HEAD(acpi_ioremaps);
93 static DEFINE_MUTEX(acpi_ioremap_lock);
95 static void __init acpi_request_region (struct acpi_generic_address *gas,
96 unsigned int length, char *desc)
100 /* Handle possible alignment issues */
101 memcpy(&addr, &gas->address, sizeof(addr));
102 if (!addr || !length)
105 /* Resources are never freed */
106 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
107 request_region(addr, length, desc);
108 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
109 request_mem_region(addr, length, desc);
112 static int __init acpi_reserve_resources(void)
114 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
115 "ACPI PM1a_EVT_BLK");
117 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
118 "ACPI PM1b_EVT_BLK");
120 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
121 "ACPI PM1a_CNT_BLK");
123 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
124 "ACPI PM1b_CNT_BLK");
126 if (acpi_gbl_FADT.pm_timer_length == 4)
127 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
129 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
132 /* Length of GPE blocks must be a non-negative multiple of 2 */
134 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
135 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
136 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
138 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
139 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
140 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
144 fs_initcall_sync(acpi_reserve_resources);
146 void acpi_os_printf(const char *fmt, ...)
150 acpi_os_vprintf(fmt, args);
153 EXPORT_SYMBOL(acpi_os_printf);
155 void acpi_os_vprintf(const char *fmt, va_list args)
157 static char buffer[512];
159 vsprintf(buffer, fmt, args);
161 #ifdef ENABLE_DEBUGGER
162 if (acpi_in_debugger) {
163 kdb_printf("%s", buffer);
165 if (printk_get_level(buffer))
166 printk("%s", buffer);
168 printk(KERN_CONT "%s", buffer);
171 if (acpi_debugger_write_log(buffer) < 0) {
172 if (printk_get_level(buffer))
173 printk("%s", buffer);
175 printk(KERN_CONT "%s", buffer);
181 static unsigned long acpi_rsdp;
182 static int __init setup_acpi_rsdp(char *arg)
184 if (kstrtoul(arg, 16, &acpi_rsdp))
188 early_param("acpi_rsdp", setup_acpi_rsdp);
191 acpi_physical_address __init acpi_os_get_root_pointer(void)
198 if (efi_enabled(EFI_CONFIG_TABLES)) {
199 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
201 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
204 printk(KERN_ERR PREFIX
205 "System description tables not found\n");
208 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
209 acpi_physical_address pa = 0;
211 acpi_find_root_pointer(&pa);
218 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
219 static struct acpi_ioremap *
220 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
222 struct acpi_ioremap *map;
224 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
225 if (map->phys <= phys &&
226 phys + size <= map->phys + map->size)
232 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
233 static void __iomem *
234 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
236 struct acpi_ioremap *map;
238 map = acpi_map_lookup(phys, size);
240 return map->virt + (phys - map->phys);
245 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
247 struct acpi_ioremap *map;
248 void __iomem *virt = NULL;
250 mutex_lock(&acpi_ioremap_lock);
251 map = acpi_map_lookup(phys, size);
253 virt = map->virt + (phys - map->phys);
256 mutex_unlock(&acpi_ioremap_lock);
259 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
261 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
262 static struct acpi_ioremap *
263 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
265 struct acpi_ioremap *map;
267 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
268 if (map->virt <= virt &&
269 virt + size <= map->virt + map->size)
275 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
276 /* ioremap will take care of cache attributes */
277 #define should_use_kmap(pfn) 0
279 #define should_use_kmap(pfn) page_is_ram(pfn)
282 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
286 pfn = pg_off >> PAGE_SHIFT;
287 if (should_use_kmap(pfn)) {
288 if (pg_sz > PAGE_SIZE)
290 return (void __iomem __force *)kmap(pfn_to_page(pfn));
292 return acpi_os_ioremap(pg_off, pg_sz);
295 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
299 pfn = pg_off >> PAGE_SHIFT;
300 if (should_use_kmap(pfn))
301 kunmap(pfn_to_page(pfn));
307 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
308 * @phys: Start of the physical address range to map.
309 * @size: Size of the physical address range to map.
311 * Look up the given physical address range in the list of existing ACPI memory
312 * mappings. If found, get a reference to it and return a pointer to it (its
313 * virtual address). If not found, map it, add it to that list and return a
316 * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
317 * routine simply calls __acpi_map_table() to get the job done.
320 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
322 struct acpi_ioremap *map;
324 acpi_physical_address pg_off;
327 if (phys > ULONG_MAX) {
328 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
332 if (!acpi_gbl_permanent_mmap)
333 return __acpi_map_table((unsigned long)phys, size);
335 mutex_lock(&acpi_ioremap_lock);
336 /* Check if there's a suitable mapping already. */
337 map = acpi_map_lookup(phys, size);
343 map = kzalloc(sizeof(*map), GFP_KERNEL);
345 mutex_unlock(&acpi_ioremap_lock);
349 pg_off = round_down(phys, PAGE_SIZE);
350 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
351 virt = acpi_map(pg_off, pg_sz);
353 mutex_unlock(&acpi_ioremap_lock);
358 INIT_LIST_HEAD(&map->list);
364 list_add_tail_rcu(&map->list, &acpi_ioremaps);
367 mutex_unlock(&acpi_ioremap_lock);
368 return map->virt + (phys - map->phys);
370 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
372 void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
374 return (void *)acpi_os_map_iomem(phys, size);
376 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
378 /* Must be called with mutex_lock(&acpi_ioremap_lock) */
379 static unsigned long acpi_os_drop_map_ref(struct acpi_ioremap *map)
381 unsigned long refcount = --map->refcount;
384 list_del_rcu(&map->list);
388 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
390 synchronize_rcu_expedited();
391 acpi_unmap(map->phys, map->virt);
396 * acpi_os_unmap_iomem - Drop a memory mapping reference.
397 * @virt: Start of the address range to drop a reference to.
398 * @size: Size of the address range to drop a reference to.
400 * Look up the given virtual address range in the list of existing ACPI memory
401 * mappings, drop a reference to it and unmap it if there are no more active
404 * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
405 * routine simply calls __acpi_unmap_table() to get the job done. Since
406 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
409 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
411 struct acpi_ioremap *map;
412 unsigned long refcount;
414 if (!acpi_gbl_permanent_mmap) {
415 __acpi_unmap_table(virt, size);
419 mutex_lock(&acpi_ioremap_lock);
420 map = acpi_map_lookup_virt(virt, size);
422 mutex_unlock(&acpi_ioremap_lock);
423 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
426 refcount = acpi_os_drop_map_ref(map);
427 mutex_unlock(&acpi_ioremap_lock);
430 acpi_os_map_cleanup(map);
432 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
434 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
436 return acpi_os_unmap_iomem((void __iomem *)virt, size);
438 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
440 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
442 if (!acpi_gbl_permanent_mmap)
443 __acpi_unmap_table(virt, size);
446 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
451 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
454 /* Handle possible alignment issues */
455 memcpy(&addr, &gas->address, sizeof(addr));
456 if (!addr || !gas->bit_width)
459 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
465 EXPORT_SYMBOL(acpi_os_map_generic_address);
467 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
470 struct acpi_ioremap *map;
471 unsigned long refcount;
473 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
476 /* Handle possible alignment issues */
477 memcpy(&addr, &gas->address, sizeof(addr));
478 if (!addr || !gas->bit_width)
481 mutex_lock(&acpi_ioremap_lock);
482 map = acpi_map_lookup(addr, gas->bit_width / 8);
484 mutex_unlock(&acpi_ioremap_lock);
487 refcount = acpi_os_drop_map_ref(map);
488 mutex_unlock(&acpi_ioremap_lock);
491 acpi_os_map_cleanup(map);
493 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
495 #ifdef ACPI_FUTURE_USAGE
497 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
500 return AE_BAD_PARAMETER;
502 *phys = virt_to_phys(virt);
508 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
509 static bool acpi_rev_override;
511 int __init acpi_rev_override_setup(char *str)
513 acpi_rev_override = true;
516 __setup("acpi_rev_override", acpi_rev_override_setup);
518 #define acpi_rev_override false
521 #define ACPI_MAX_OVERRIDE_LEN 100
523 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
526 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
527 acpi_string *new_val)
529 if (!init_val || !new_val)
530 return AE_BAD_PARAMETER;
533 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
534 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
536 *new_val = acpi_os_name;
539 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
540 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
541 *new_val = (char *)5;
547 static irqreturn_t acpi_irq(int irq, void *dev_id)
551 handled = (*acpi_irq_handler) (acpi_irq_context);
557 acpi_irq_not_handled++;
563 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
568 acpi_irq_stats_init();
571 * ACPI interrupts different from the SCI in our copy of the FADT are
574 if (gsi != acpi_gbl_FADT.sci_interrupt)
575 return AE_BAD_PARAMETER;
577 if (acpi_irq_handler)
578 return AE_ALREADY_ACQUIRED;
580 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
581 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
586 acpi_irq_handler = handler;
587 acpi_irq_context = context;
588 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
589 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
590 acpi_irq_handler = NULL;
591 return AE_NOT_ACQUIRED;
598 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
600 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
601 return AE_BAD_PARAMETER;
603 free_irq(acpi_sci_irq, acpi_irq);
604 acpi_irq_handler = NULL;
605 acpi_sci_irq = INVALID_ACPI_IRQ;
611 * Running in interpreter thread context, safe to sleep
614 void acpi_os_sleep(u64 ms)
619 void acpi_os_stall(u32 us)
627 touch_nmi_watchdog();
633 * Support ACPI 3.0 AML Timer operand
634 * Returns 64-bit free-running, monotonically increasing timer
635 * with 100ns granularity
637 u64 acpi_os_get_timer(void)
639 u64 time_ns = ktime_to_ns(ktime_get());
640 do_div(time_ns, 100);
644 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
653 *(u8 *) value = inb(port);
654 } else if (width <= 16) {
655 *(u16 *) value = inw(port);
656 } else if (width <= 32) {
657 *(u32 *) value = inl(port);
665 EXPORT_SYMBOL(acpi_os_read_port);
667 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
671 } else if (width <= 16) {
673 } else if (width <= 32) {
682 EXPORT_SYMBOL(acpi_os_write_port);
685 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
687 void __iomem *virt_addr;
688 unsigned int size = width / 8;
693 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
696 virt_addr = acpi_os_ioremap(phys_addr, size);
698 return AE_BAD_ADDRESS;
707 *(u8 *) value = readb(virt_addr);
710 *(u16 *) value = readw(virt_addr);
713 *(u32 *) value = readl(virt_addr);
716 *(u64 *) value = readq(virt_addr);
731 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
733 void __iomem *virt_addr;
734 unsigned int size = width / 8;
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
741 virt_addr = acpi_os_ioremap(phys_addr, size);
743 return AE_BAD_ADDRESS;
749 writeb(value, virt_addr);
752 writew(value, virt_addr);
755 writel(value, virt_addr);
758 writeq(value, virt_addr);
773 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
774 u64 *value, u32 width)
780 return AE_BAD_PARAMETER;
796 result = raw_pci_read(pci_id->segment, pci_id->bus,
797 PCI_DEVFN(pci_id->device, pci_id->function),
798 reg, size, &value32);
801 return (result ? AE_ERROR : AE_OK);
805 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
806 u64 value, u32 width)
824 result = raw_pci_write(pci_id->segment, pci_id->bus,
825 PCI_DEVFN(pci_id->device, pci_id->function),
828 return (result ? AE_ERROR : AE_OK);
831 static void acpi_os_execute_deferred(struct work_struct *work)
833 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
835 dpc->function(dpc->context);
839 #ifdef CONFIG_ACPI_DEBUGGER
840 static struct acpi_debugger acpi_debugger;
841 static bool acpi_debugger_initialized;
843 int acpi_register_debugger(struct module *owner,
844 const struct acpi_debugger_ops *ops)
848 mutex_lock(&acpi_debugger.lock);
849 if (acpi_debugger.ops) {
854 acpi_debugger.owner = owner;
855 acpi_debugger.ops = ops;
858 mutex_unlock(&acpi_debugger.lock);
861 EXPORT_SYMBOL(acpi_register_debugger);
863 void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
865 mutex_lock(&acpi_debugger.lock);
866 if (ops == acpi_debugger.ops) {
867 acpi_debugger.ops = NULL;
868 acpi_debugger.owner = NULL;
870 mutex_unlock(&acpi_debugger.lock);
872 EXPORT_SYMBOL(acpi_unregister_debugger);
874 int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
877 int (*func)(acpi_osd_exec_callback, void *);
878 struct module *owner;
880 if (!acpi_debugger_initialized)
882 mutex_lock(&acpi_debugger.lock);
883 if (!acpi_debugger.ops) {
887 if (!try_module_get(acpi_debugger.owner)) {
891 func = acpi_debugger.ops->create_thread;
892 owner = acpi_debugger.owner;
893 mutex_unlock(&acpi_debugger.lock);
895 ret = func(function, context);
897 mutex_lock(&acpi_debugger.lock);
900 mutex_unlock(&acpi_debugger.lock);
904 ssize_t acpi_debugger_write_log(const char *msg)
907 ssize_t (*func)(const char *);
908 struct module *owner;
910 if (!acpi_debugger_initialized)
912 mutex_lock(&acpi_debugger.lock);
913 if (!acpi_debugger.ops) {
917 if (!try_module_get(acpi_debugger.owner)) {
921 func = acpi_debugger.ops->write_log;
922 owner = acpi_debugger.owner;
923 mutex_unlock(&acpi_debugger.lock);
927 mutex_lock(&acpi_debugger.lock);
930 mutex_unlock(&acpi_debugger.lock);
934 ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
937 ssize_t (*func)(char *, size_t);
938 struct module *owner;
940 if (!acpi_debugger_initialized)
942 mutex_lock(&acpi_debugger.lock);
943 if (!acpi_debugger.ops) {
947 if (!try_module_get(acpi_debugger.owner)) {
951 func = acpi_debugger.ops->read_cmd;
952 owner = acpi_debugger.owner;
953 mutex_unlock(&acpi_debugger.lock);
955 ret = func(buffer, buffer_length);
957 mutex_lock(&acpi_debugger.lock);
960 mutex_unlock(&acpi_debugger.lock);
964 int acpi_debugger_wait_command_ready(void)
967 int (*func)(bool, char *, size_t);
968 struct module *owner;
970 if (!acpi_debugger_initialized)
972 mutex_lock(&acpi_debugger.lock);
973 if (!acpi_debugger.ops) {
977 if (!try_module_get(acpi_debugger.owner)) {
981 func = acpi_debugger.ops->wait_command_ready;
982 owner = acpi_debugger.owner;
983 mutex_unlock(&acpi_debugger.lock);
985 ret = func(acpi_gbl_method_executing,
986 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
988 mutex_lock(&acpi_debugger.lock);
991 mutex_unlock(&acpi_debugger.lock);
995 int acpi_debugger_notify_command_complete(void)
999 struct module *owner;
1001 if (!acpi_debugger_initialized)
1003 mutex_lock(&acpi_debugger.lock);
1004 if (!acpi_debugger.ops) {
1008 if (!try_module_get(acpi_debugger.owner)) {
1012 func = acpi_debugger.ops->notify_command_complete;
1013 owner = acpi_debugger.owner;
1014 mutex_unlock(&acpi_debugger.lock);
1018 mutex_lock(&acpi_debugger.lock);
1021 mutex_unlock(&acpi_debugger.lock);
1025 int __init acpi_debugger_init(void)
1027 mutex_init(&acpi_debugger.lock);
1028 acpi_debugger_initialized = true;
1033 /*******************************************************************************
1035 * FUNCTION: acpi_os_execute
1037 * PARAMETERS: Type - Type of the callback
1038 * Function - Function to be executed
1039 * Context - Function parameters
1043 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1044 * immediately executes function on a separate thread.
1046 ******************************************************************************/
1048 acpi_status acpi_os_execute(acpi_execute_type type,
1049 acpi_osd_exec_callback function, void *context)
1051 acpi_status status = AE_OK;
1052 struct acpi_os_dpc *dpc;
1053 struct workqueue_struct *queue;
1055 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1056 "Scheduling function [%p(%p)] for deferred execution.\n",
1057 function, context));
1059 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1060 ret = acpi_debugger_create_thread(function, context);
1062 pr_err("Call to kthread_create() failed.\n");
1069 * Allocate/initialize DPC structure. Note that this memory will be
1070 * freed by the callee. The kernel handles the work_struct list in a
1071 * way that allows us to also free its memory inside the callee.
1072 * Because we may want to schedule several tasks with different
1073 * parameters we can't use the approach some kernel code uses of
1074 * having a static work_struct.
1077 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1079 return AE_NO_MEMORY;
1081 dpc->function = function;
1082 dpc->context = context;
1085 * To prevent lockdep from complaining unnecessarily, make sure that
1086 * there is a different static lockdep key for each workqueue by using
1087 * INIT_WORK() for each of them separately.
1089 if (type == OSL_NOTIFY_HANDLER) {
1090 queue = kacpi_notify_wq;
1091 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1092 } else if (type == OSL_GPE_HANDLER) {
1094 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1096 pr_err("Unsupported os_execute type %d.\n", type);
1100 if (ACPI_FAILURE(status))
1104 * On some machines, a software-initiated SMI causes corruption unless
1105 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1106 * typically it's done in GPE-related methods that are run via
1107 * workqueues, so we can avoid the known corruption cases by always
1108 * queueing on CPU 0.
1110 ret = queue_work_on(0, queue, &dpc->work);
1112 printk(KERN_ERR PREFIX
1113 "Call to queue_work() failed.\n");
1117 if (ACPI_FAILURE(status))
1122 EXPORT_SYMBOL(acpi_os_execute);
1124 void acpi_os_wait_events_complete(void)
1127 * Make sure the GPE handler or the fixed event handler is not used
1128 * on another CPU after removal.
1130 if (acpi_sci_irq_valid())
1131 synchronize_hardirq(acpi_sci_irq);
1132 flush_workqueue(kacpid_wq);
1133 flush_workqueue(kacpi_notify_wq);
1135 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1137 struct acpi_hp_work {
1138 struct work_struct work;
1139 struct acpi_device *adev;
1143 static void acpi_hotplug_work_fn(struct work_struct *work)
1145 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1147 acpi_os_wait_events_complete();
1148 acpi_device_hotplug(hpw->adev, hpw->src);
1152 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1154 struct acpi_hp_work *hpw;
1156 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1157 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1160 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1162 return AE_NO_MEMORY;
1164 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1168 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1169 * the hotplug code may call driver .remove() functions, which may
1170 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1173 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1180 bool acpi_queue_hotplug_work(struct work_struct *work)
1182 return queue_work(kacpi_hotplug_wq, work);
1186 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1188 struct semaphore *sem = NULL;
1190 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1192 return AE_NO_MEMORY;
1194 sema_init(sem, initial_units);
1196 *handle = (acpi_handle *) sem;
1198 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1199 *handle, initial_units));
1205 * TODO: A better way to delete semaphores? Linux doesn't have a
1206 * 'delete_semaphore()' function -- may result in an invalid
1207 * pointer dereference for non-synchronized consumers. Should
1208 * we at least check for blocked threads and signal/cancel them?
1211 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1213 struct semaphore *sem = (struct semaphore *)handle;
1216 return AE_BAD_PARAMETER;
1218 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1220 BUG_ON(!list_empty(&sem->wait_list));
1228 * TODO: Support for units > 1?
1230 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1232 acpi_status status = AE_OK;
1233 struct semaphore *sem = (struct semaphore *)handle;
1237 if (!acpi_os_initialized)
1240 if (!sem || (units < 1))
1241 return AE_BAD_PARAMETER;
1246 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1247 handle, units, timeout));
1249 if (timeout == ACPI_WAIT_FOREVER)
1250 jiffies = MAX_SCHEDULE_TIMEOUT;
1252 jiffies = msecs_to_jiffies(timeout);
1254 ret = down_timeout(sem, jiffies);
1258 if (ACPI_FAILURE(status)) {
1259 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1260 "Failed to acquire semaphore[%p|%d|%d], %s",
1261 handle, units, timeout,
1262 acpi_format_exception(status)));
1264 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1265 "Acquired semaphore[%p|%d|%d]", handle,
1273 * TODO: Support for units > 1?
1275 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1277 struct semaphore *sem = (struct semaphore *)handle;
1279 if (!acpi_os_initialized)
1282 if (!sem || (units < 1))
1283 return AE_BAD_PARAMETER;
1288 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1296 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1298 #ifdef ENABLE_DEBUGGER
1299 if (acpi_in_debugger) {
1302 kdb_read(buffer, buffer_length);
1304 /* remove the CR kdb includes */
1305 chars = strlen(buffer) - 1;
1306 buffer[chars] = '\0';
1311 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1320 EXPORT_SYMBOL(acpi_os_get_line);
1322 acpi_status acpi_os_wait_command_ready(void)
1326 ret = acpi_debugger_wait_command_ready();
1332 acpi_status acpi_os_notify_command_complete(void)
1336 ret = acpi_debugger_notify_command_complete();
1342 acpi_status acpi_os_signal(u32 function, void *info)
1345 case ACPI_SIGNAL_FATAL:
1346 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1348 case ACPI_SIGNAL_BREAKPOINT:
1351 * ACPI spec. says to treat it as a NOP unless
1352 * you are debugging. So if/when we integrate
1353 * AML debugger into the kernel debugger its
1354 * hook will go here. But until then it is
1355 * not useful to print anything on breakpoints.
1365 static int __init acpi_os_name_setup(char *str)
1367 char *p = acpi_os_name;
1368 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1373 for (; count-- && *str; str++) {
1374 if (isalnum(*str) || *str == ' ' || *str == ':')
1376 else if (*str == '\'' || *str == '"')
1387 __setup("acpi_os_name=", acpi_os_name_setup);
1390 * Disable the auto-serialization of named objects creation methods.
1392 * This feature is enabled by default. It marks the AML control methods
1393 * that contain the opcodes to create named objects as "Serialized".
1395 static int __init acpi_no_auto_serialize_setup(char *str)
1397 acpi_gbl_auto_serialize_methods = FALSE;
1398 pr_info("ACPI: auto-serialization disabled\n");
1403 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1405 /* Check of resource interference between native drivers and ACPI
1406 * OperationRegions (SystemIO and System Memory only).
1407 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1408 * in arbitrary AML code and can interfere with legacy drivers.
1409 * acpi_enforce_resources= can be set to:
1411 * - strict (default) (2)
1412 * -> further driver trying to access the resources will not load
1414 * -> further driver trying to access the resources will load, but you
1415 * get a system message that something might go wrong...
1418 * -> ACPI Operation Region resources will not be registered
1421 #define ENFORCE_RESOURCES_STRICT 2
1422 #define ENFORCE_RESOURCES_LAX 1
1423 #define ENFORCE_RESOURCES_NO 0
1425 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1427 static int __init acpi_enforce_resources_setup(char *str)
1429 if (str == NULL || *str == '\0')
1432 if (!strcmp("strict", str))
1433 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1434 else if (!strcmp("lax", str))
1435 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1436 else if (!strcmp("no", str))
1437 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1442 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1444 /* Check for resource conflicts between ACPI OperationRegions and native
1446 int acpi_check_resource_conflict(const struct resource *res)
1448 acpi_adr_space_type space_id;
1453 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1455 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1458 if (res->flags & IORESOURCE_IO)
1459 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1461 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1463 length = resource_size(res);
1464 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1466 clash = acpi_check_address_range(space_id, res->start, length, warn);
1469 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1470 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1471 printk(KERN_NOTICE "ACPI: This conflict may"
1472 " cause random problems and system"
1474 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1475 " for this device, you should use it instead of"
1476 " the native driver\n");
1478 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1483 EXPORT_SYMBOL(acpi_check_resource_conflict);
1485 int acpi_check_region(resource_size_t start, resource_size_t n,
1488 struct resource res = {
1490 .end = start + n - 1,
1492 .flags = IORESOURCE_IO,
1495 return acpi_check_resource_conflict(&res);
1497 EXPORT_SYMBOL(acpi_check_region);
1500 * Let drivers know whether the resource checks are effective
1502 int acpi_resources_are_enforced(void)
1504 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1506 EXPORT_SYMBOL(acpi_resources_are_enforced);
1509 * Deallocate the memory for a spinlock.
1511 void acpi_os_delete_lock(acpi_spinlock handle)
1517 * Acquire a spinlock.
1519 * handle is a pointer to the spinlock_t.
1522 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1524 acpi_cpu_flags flags;
1525 spin_lock_irqsave(lockp, flags);
1530 * Release a spinlock. See above.
1533 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1535 spin_unlock_irqrestore(lockp, flags);
1538 #ifndef ACPI_USE_LOCAL_CACHE
1540 /*******************************************************************************
1542 * FUNCTION: acpi_os_create_cache
1544 * PARAMETERS: name - Ascii name for the cache
1545 * size - Size of each cached object
1546 * depth - Maximum depth of the cache (in objects) <ignored>
1547 * cache - Where the new cache object is returned
1551 * DESCRIPTION: Create a cache object
1553 ******************************************************************************/
1556 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1558 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1565 /*******************************************************************************
1567 * FUNCTION: acpi_os_purge_cache
1569 * PARAMETERS: Cache - Handle to cache object
1573 * DESCRIPTION: Free all objects within the requested cache.
1575 ******************************************************************************/
1577 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1579 kmem_cache_shrink(cache);
1583 /*******************************************************************************
1585 * FUNCTION: acpi_os_delete_cache
1587 * PARAMETERS: Cache - Handle to cache object
1591 * DESCRIPTION: Free all objects within the requested cache and delete the
1594 ******************************************************************************/
1596 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1598 kmem_cache_destroy(cache);
1602 /*******************************************************************************
1604 * FUNCTION: acpi_os_release_object
1606 * PARAMETERS: Cache - Handle to cache object
1607 * Object - The object to be released
1611 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1612 * the object is deleted.
1614 ******************************************************************************/
1616 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1618 kmem_cache_free(cache, object);
1623 static int __init acpi_no_static_ssdt_setup(char *s)
1625 acpi_gbl_disable_ssdt_table_install = TRUE;
1626 pr_info("ACPI: static SSDT installation disabled\n");
1631 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1633 static int __init acpi_disable_return_repair(char *s)
1635 printk(KERN_NOTICE PREFIX
1636 "ACPI: Predefined validation mechanism disabled\n");
1637 acpi_gbl_disable_auto_repair = TRUE;
1642 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1644 acpi_status __init acpi_os_initialize(void)
1646 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1647 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1648 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1649 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1650 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1652 * Use acpi_os_map_generic_address to pre-map the reset
1653 * register if it's in system memory.
1657 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1658 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1660 acpi_os_initialized = true;
1665 acpi_status __init acpi_os_initialize1(void)
1667 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1668 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1669 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1671 BUG_ON(!kacpi_notify_wq);
1672 BUG_ON(!kacpi_hotplug_wq);
1677 acpi_status acpi_os_terminate(void)
1679 if (acpi_irq_handler) {
1680 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1684 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1685 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1686 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1687 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1688 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1689 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1691 destroy_workqueue(kacpid_wq);
1692 destroy_workqueue(kacpi_notify_wq);
1693 destroy_workqueue(kacpi_hotplug_wq);
1698 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1702 if (__acpi_os_prepare_sleep)
1703 rc = __acpi_os_prepare_sleep(sleep_state,
1704 pm1a_control, pm1b_control);
1708 return AE_CTRL_SKIP;
1713 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1714 u32 pm1a_ctrl, u32 pm1b_ctrl))
1716 __acpi_os_prepare_sleep = func;
1719 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1723 if (__acpi_os_prepare_extended_sleep)
1724 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1729 return AE_CTRL_SKIP;
1734 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1735 u32 val_a, u32 val_b))
1737 __acpi_os_prepare_extended_sleep = func;