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
= 0;
197 if (acpi_rsdp
&& !kernel_is_locked_down("ACPI RSDP specification"))
201 if (efi_enabled(EFI_CONFIG_TABLES
)) {
202 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
204 if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
206 pr_err(PREFIX
"System description tables not found\n");
207 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP
)) {
208 acpi_find_root_pointer(&pa
);
214 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
215 static struct acpi_ioremap
*
216 acpi_map_lookup(acpi_physical_address phys
, acpi_size size
)
218 struct acpi_ioremap
*map
;
220 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
221 if (map
->phys
<= phys
&&
222 phys
+ size
<= map
->phys
+ map
->size
)
228 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
229 static void __iomem
*
230 acpi_map_vaddr_lookup(acpi_physical_address phys
, unsigned int size
)
232 struct acpi_ioremap
*map
;
234 map
= acpi_map_lookup(phys
, size
);
236 return map
->virt
+ (phys
- map
->phys
);
241 void __iomem
*acpi_os_get_iomem(acpi_physical_address phys
, unsigned int size
)
243 struct acpi_ioremap
*map
;
244 void __iomem
*virt
= NULL
;
246 mutex_lock(&acpi_ioremap_lock
);
247 map
= acpi_map_lookup(phys
, size
);
249 virt
= map
->virt
+ (phys
- map
->phys
);
252 mutex_unlock(&acpi_ioremap_lock
);
255 EXPORT_SYMBOL_GPL(acpi_os_get_iomem
);
257 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
258 static struct acpi_ioremap
*
259 acpi_map_lookup_virt(void __iomem
*virt
, acpi_size size
)
261 struct acpi_ioremap
*map
;
263 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
264 if (map
->virt
<= virt
&&
265 virt
+ size
<= map
->virt
+ map
->size
)
271 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
272 /* ioremap will take care of cache attributes */
273 #define should_use_kmap(pfn) 0
275 #define should_use_kmap(pfn) page_is_ram(pfn)
278 static void __iomem
*acpi_map(acpi_physical_address pg_off
, unsigned long pg_sz
)
282 pfn
= pg_off
>> PAGE_SHIFT
;
283 if (should_use_kmap(pfn
)) {
284 if (pg_sz
> PAGE_SIZE
)
286 return (void __iomem __force
*)kmap(pfn_to_page(pfn
));
288 return acpi_os_ioremap(pg_off
, pg_sz
);
291 static void acpi_unmap(acpi_physical_address pg_off
, void __iomem
*vaddr
)
295 pfn
= pg_off
>> PAGE_SHIFT
;
296 if (should_use_kmap(pfn
))
297 kunmap(pfn_to_page(pfn
));
303 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
304 * @phys: Start of the physical address range to map.
305 * @size: Size of the physical address range to map.
307 * Look up the given physical address range in the list of existing ACPI memory
308 * mappings. If found, get a reference to it and return a pointer to it (its
309 * virtual address). If not found, map it, add it to that list and return a
312 * During early init (when acpi_permanent_mmap has not been set yet) this
313 * routine simply calls __acpi_map_table() to get the job done.
316 acpi_os_map_iomem(acpi_physical_address phys
, acpi_size size
)
318 struct acpi_ioremap
*map
;
320 acpi_physical_address pg_off
;
323 if (phys
> ULONG_MAX
) {
324 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
328 if (!acpi_permanent_mmap
)
329 return __acpi_map_table((unsigned long)phys
, size
);
331 mutex_lock(&acpi_ioremap_lock
);
332 /* Check if there's a suitable mapping already. */
333 map
= acpi_map_lookup(phys
, size
);
339 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
341 mutex_unlock(&acpi_ioremap_lock
);
345 pg_off
= round_down(phys
, PAGE_SIZE
);
346 pg_sz
= round_up(phys
+ size
, PAGE_SIZE
) - pg_off
;
347 virt
= acpi_map(pg_off
, pg_sz
);
349 mutex_unlock(&acpi_ioremap_lock
);
354 INIT_LIST_HEAD(&map
->list
);
360 list_add_tail_rcu(&map
->list
, &acpi_ioremaps
);
363 mutex_unlock(&acpi_ioremap_lock
);
364 return map
->virt
+ (phys
- map
->phys
);
366 EXPORT_SYMBOL_GPL(acpi_os_map_iomem
);
368 void *__ref
acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
370 return (void *)acpi_os_map_iomem(phys
, size
);
372 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
374 static void acpi_os_drop_map_ref(struct acpi_ioremap
*map
)
376 if (!--map
->refcount
)
377 list_del_rcu(&map
->list
);
380 static void acpi_os_map_cleanup(struct acpi_ioremap
*map
)
382 if (!map
->refcount
) {
383 synchronize_rcu_expedited();
384 acpi_unmap(map
->phys
, map
->virt
);
390 * acpi_os_unmap_iomem - Drop a memory mapping reference.
391 * @virt: Start of the address range to drop a reference to.
392 * @size: Size of the address range to drop a reference to.
394 * Look up the given virtual address range in the list of existing ACPI memory
395 * mappings, drop a reference to it and unmap it if there are no more active
398 * During early init (when acpi_permanent_mmap has not been set yet) this
399 * routine simply calls __acpi_unmap_table() to get the job done. Since
400 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
403 void __ref
acpi_os_unmap_iomem(void __iomem
*virt
, acpi_size size
)
405 struct acpi_ioremap
*map
;
407 if (!acpi_permanent_mmap
) {
408 __acpi_unmap_table(virt
, size
);
412 mutex_lock(&acpi_ioremap_lock
);
413 map
= acpi_map_lookup_virt(virt
, size
);
415 mutex_unlock(&acpi_ioremap_lock
);
416 WARN(true, PREFIX
"%s: bad address %p\n", __func__
, virt
);
419 acpi_os_drop_map_ref(map
);
420 mutex_unlock(&acpi_ioremap_lock
);
422 acpi_os_map_cleanup(map
);
424 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem
);
426 void __ref
acpi_os_unmap_memory(void *virt
, acpi_size size
)
428 return acpi_os_unmap_iomem((void __iomem
*)virt
, size
);
430 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
432 int acpi_os_map_generic_address(struct acpi_generic_address
*gas
)
437 if (gas
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
440 /* Handle possible alignment issues */
441 memcpy(&addr
, &gas
->address
, sizeof(addr
));
442 if (!addr
|| !gas
->bit_width
)
445 virt
= acpi_os_map_iomem(addr
, gas
->bit_width
/ 8);
451 EXPORT_SYMBOL(acpi_os_map_generic_address
);
453 void acpi_os_unmap_generic_address(struct acpi_generic_address
*gas
)
456 struct acpi_ioremap
*map
;
458 if (gas
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
461 /* Handle possible alignment issues */
462 memcpy(&addr
, &gas
->address
, sizeof(addr
));
463 if (!addr
|| !gas
->bit_width
)
466 mutex_lock(&acpi_ioremap_lock
);
467 map
= acpi_map_lookup(addr
, gas
->bit_width
/ 8);
469 mutex_unlock(&acpi_ioremap_lock
);
472 acpi_os_drop_map_ref(map
);
473 mutex_unlock(&acpi_ioremap_lock
);
475 acpi_os_map_cleanup(map
);
477 EXPORT_SYMBOL(acpi_os_unmap_generic_address
);
479 #ifdef ACPI_FUTURE_USAGE
481 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
484 return AE_BAD_PARAMETER
;
486 *phys
= virt_to_phys(virt
);
492 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
493 static bool acpi_rev_override
;
495 int __init
acpi_rev_override_setup(char *str
)
497 acpi_rev_override
= true;
500 __setup("acpi_rev_override", acpi_rev_override_setup
);
502 #define acpi_rev_override false
505 #define ACPI_MAX_OVERRIDE_LEN 100
507 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
510 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
511 acpi_string
*new_val
)
513 if (!init_val
|| !new_val
)
514 return AE_BAD_PARAMETER
;
517 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
518 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
520 *new_val
= acpi_os_name
;
523 if (!memcmp(init_val
->name
, "_REV", 4) && acpi_rev_override
) {
524 printk(KERN_INFO PREFIX
"Overriding _REV return value to 5\n");
525 *new_val
= (char *)5;
531 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
535 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
541 acpi_irq_not_handled
++;
547 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
552 acpi_irq_stats_init();
555 * ACPI interrupts different from the SCI in our copy of the FADT are
558 if (gsi
!= acpi_gbl_FADT
.sci_interrupt
)
559 return AE_BAD_PARAMETER
;
561 if (acpi_irq_handler
)
562 return AE_ALREADY_ACQUIRED
;
564 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
565 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
570 acpi_irq_handler
= handler
;
571 acpi_irq_context
= context
;
572 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
573 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
574 acpi_irq_handler
= NULL
;
575 return AE_NOT_ACQUIRED
;
582 acpi_status
acpi_os_remove_interrupt_handler(u32 gsi
, acpi_osd_handler handler
)
584 if (gsi
!= acpi_gbl_FADT
.sci_interrupt
|| !acpi_sci_irq_valid())
585 return AE_BAD_PARAMETER
;
587 free_irq(acpi_sci_irq
, acpi_irq
);
588 acpi_irq_handler
= NULL
;
589 acpi_sci_irq
= INVALID_ACPI_IRQ
;
595 * Running in interpreter thread context, safe to sleep
598 void acpi_os_sleep(u64 ms
)
603 void acpi_os_stall(u32 us
)
611 touch_nmi_watchdog();
617 * Support ACPI 3.0 AML Timer operand
618 * Returns 64-bit free-running, monotonically increasing timer
619 * with 100ns granularity
621 u64
acpi_os_get_timer(void)
623 u64 time_ns
= ktime_to_ns(ktime_get());
624 do_div(time_ns
, 100);
628 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
637 *(u8
*) value
= inb(port
);
638 } else if (width
<= 16) {
639 *(u16
*) value
= inw(port
);
640 } else if (width
<= 32) {
641 *(u32
*) value
= inl(port
);
649 EXPORT_SYMBOL(acpi_os_read_port
);
651 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
655 } else if (width
<= 16) {
657 } else if (width
<= 32) {
666 EXPORT_SYMBOL(acpi_os_write_port
);
668 int acpi_os_read_iomem(void __iomem
*virt_addr
, u64
*value
, u32 width
)
673 *(u8
*) value
= readb(virt_addr
);
676 *(u16
*) value
= readw(virt_addr
);
679 *(u32
*) value
= readl(virt_addr
);
682 *(u64
*) value
= readq(virt_addr
);
692 acpi_os_read_memory(acpi_physical_address phys_addr
, u64
*value
, u32 width
)
694 void __iomem
*virt_addr
;
695 unsigned int size
= width
/ 8;
701 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
704 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
706 return AE_BAD_ADDRESS
;
713 error
= acpi_os_read_iomem(virt_addr
, value
, width
);
725 acpi_os_write_memory(acpi_physical_address phys_addr
, u64 value
, u32 width
)
727 void __iomem
*virt_addr
;
728 unsigned int size
= width
/ 8;
732 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
735 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
737 return AE_BAD_ADDRESS
;
743 writeb(value
, virt_addr
);
746 writew(value
, virt_addr
);
749 writel(value
, virt_addr
);
752 writeq(value
, virt_addr
);
767 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
768 u64
*value
, u32 width
)
774 return AE_BAD_PARAMETER
;
790 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
791 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
792 reg
, size
, &value32
);
795 return (result
? AE_ERROR
: AE_OK
);
799 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
800 u64 value
, u32 width
)
818 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
819 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
822 return (result
? AE_ERROR
: AE_OK
);
825 static void acpi_os_execute_deferred(struct work_struct
*work
)
827 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
829 dpc
->function(dpc
->context
);
833 #ifdef CONFIG_ACPI_DEBUGGER
834 static struct acpi_debugger acpi_debugger
;
835 static bool acpi_debugger_initialized
;
837 int acpi_register_debugger(struct module
*owner
,
838 const struct acpi_debugger_ops
*ops
)
842 mutex_lock(&acpi_debugger
.lock
);
843 if (acpi_debugger
.ops
) {
848 acpi_debugger
.owner
= owner
;
849 acpi_debugger
.ops
= ops
;
852 mutex_unlock(&acpi_debugger
.lock
);
855 EXPORT_SYMBOL(acpi_register_debugger
);
857 void acpi_unregister_debugger(const struct acpi_debugger_ops
*ops
)
859 mutex_lock(&acpi_debugger
.lock
);
860 if (ops
== acpi_debugger
.ops
) {
861 acpi_debugger
.ops
= NULL
;
862 acpi_debugger
.owner
= NULL
;
864 mutex_unlock(&acpi_debugger
.lock
);
866 EXPORT_SYMBOL(acpi_unregister_debugger
);
868 int acpi_debugger_create_thread(acpi_osd_exec_callback function
, void *context
)
871 int (*func
)(acpi_osd_exec_callback
, void *);
872 struct module
*owner
;
874 if (!acpi_debugger_initialized
)
876 mutex_lock(&acpi_debugger
.lock
);
877 if (!acpi_debugger
.ops
) {
881 if (!try_module_get(acpi_debugger
.owner
)) {
885 func
= acpi_debugger
.ops
->create_thread
;
886 owner
= acpi_debugger
.owner
;
887 mutex_unlock(&acpi_debugger
.lock
);
889 ret
= func(function
, context
);
891 mutex_lock(&acpi_debugger
.lock
);
894 mutex_unlock(&acpi_debugger
.lock
);
898 ssize_t
acpi_debugger_write_log(const char *msg
)
901 ssize_t (*func
)(const char *);
902 struct module
*owner
;
904 if (!acpi_debugger_initialized
)
906 mutex_lock(&acpi_debugger
.lock
);
907 if (!acpi_debugger
.ops
) {
911 if (!try_module_get(acpi_debugger
.owner
)) {
915 func
= acpi_debugger
.ops
->write_log
;
916 owner
= acpi_debugger
.owner
;
917 mutex_unlock(&acpi_debugger
.lock
);
921 mutex_lock(&acpi_debugger
.lock
);
924 mutex_unlock(&acpi_debugger
.lock
);
928 ssize_t
acpi_debugger_read_cmd(char *buffer
, size_t buffer_length
)
931 ssize_t (*func
)(char *, size_t);
932 struct module
*owner
;
934 if (!acpi_debugger_initialized
)
936 mutex_lock(&acpi_debugger
.lock
);
937 if (!acpi_debugger
.ops
) {
941 if (!try_module_get(acpi_debugger
.owner
)) {
945 func
= acpi_debugger
.ops
->read_cmd
;
946 owner
= acpi_debugger
.owner
;
947 mutex_unlock(&acpi_debugger
.lock
);
949 ret
= func(buffer
, buffer_length
);
951 mutex_lock(&acpi_debugger
.lock
);
954 mutex_unlock(&acpi_debugger
.lock
);
958 int acpi_debugger_wait_command_ready(void)
961 int (*func
)(bool, char *, size_t);
962 struct module
*owner
;
964 if (!acpi_debugger_initialized
)
966 mutex_lock(&acpi_debugger
.lock
);
967 if (!acpi_debugger
.ops
) {
971 if (!try_module_get(acpi_debugger
.owner
)) {
975 func
= acpi_debugger
.ops
->wait_command_ready
;
976 owner
= acpi_debugger
.owner
;
977 mutex_unlock(&acpi_debugger
.lock
);
979 ret
= func(acpi_gbl_method_executing
,
980 acpi_gbl_db_line_buf
, ACPI_DB_LINE_BUFFER_SIZE
);
982 mutex_lock(&acpi_debugger
.lock
);
985 mutex_unlock(&acpi_debugger
.lock
);
989 int acpi_debugger_notify_command_complete(void)
993 struct module
*owner
;
995 if (!acpi_debugger_initialized
)
997 mutex_lock(&acpi_debugger
.lock
);
998 if (!acpi_debugger
.ops
) {
1002 if (!try_module_get(acpi_debugger
.owner
)) {
1006 func
= acpi_debugger
.ops
->notify_command_complete
;
1007 owner
= acpi_debugger
.owner
;
1008 mutex_unlock(&acpi_debugger
.lock
);
1012 mutex_lock(&acpi_debugger
.lock
);
1015 mutex_unlock(&acpi_debugger
.lock
);
1019 int __init
acpi_debugger_init(void)
1021 mutex_init(&acpi_debugger
.lock
);
1022 acpi_debugger_initialized
= true;
1027 /*******************************************************************************
1029 * FUNCTION: acpi_os_execute
1031 * PARAMETERS: Type - Type of the callback
1032 * Function - Function to be executed
1033 * Context - Function parameters
1037 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1038 * immediately executes function on a separate thread.
1040 ******************************************************************************/
1042 acpi_status
acpi_os_execute(acpi_execute_type type
,
1043 acpi_osd_exec_callback function
, void *context
)
1045 acpi_status status
= AE_OK
;
1046 struct acpi_os_dpc
*dpc
;
1047 struct workqueue_struct
*queue
;
1049 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
1050 "Scheduling function [%p(%p)] for deferred execution.\n",
1051 function
, context
));
1053 if (type
== OSL_DEBUGGER_MAIN_THREAD
) {
1054 ret
= acpi_debugger_create_thread(function
, context
);
1056 pr_err("Call to kthread_create() failed.\n");
1063 * Allocate/initialize DPC structure. Note that this memory will be
1064 * freed by the callee. The kernel handles the work_struct list in a
1065 * way that allows us to also free its memory inside the callee.
1066 * Because we may want to schedule several tasks with different
1067 * parameters we can't use the approach some kernel code uses of
1068 * having a static work_struct.
1071 dpc
= kzalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
1073 return AE_NO_MEMORY
;
1075 dpc
->function
= function
;
1076 dpc
->context
= context
;
1079 * To prevent lockdep from complaining unnecessarily, make sure that
1080 * there is a different static lockdep key for each workqueue by using
1081 * INIT_WORK() for each of them separately.
1083 if (type
== OSL_NOTIFY_HANDLER
) {
1084 queue
= kacpi_notify_wq
;
1085 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1086 } else if (type
== OSL_GPE_HANDLER
) {
1088 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1090 pr_err("Unsupported os_execute type %d.\n", type
);
1094 if (ACPI_FAILURE(status
))
1098 * On some machines, a software-initiated SMI causes corruption unless
1099 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1100 * typically it's done in GPE-related methods that are run via
1101 * workqueues, so we can avoid the known corruption cases by always
1102 * queueing on CPU 0.
1104 ret
= queue_work_on(0, queue
, &dpc
->work
);
1106 printk(KERN_ERR PREFIX
1107 "Call to queue_work() failed.\n");
1111 if (ACPI_FAILURE(status
))
1116 EXPORT_SYMBOL(acpi_os_execute
);
1118 void acpi_os_wait_events_complete(void)
1121 * Make sure the GPE handler or the fixed event handler is not used
1122 * on another CPU after removal.
1124 if (acpi_sci_irq_valid())
1125 synchronize_hardirq(acpi_sci_irq
);
1126 flush_workqueue(kacpid_wq
);
1127 flush_workqueue(kacpi_notify_wq
);
1130 struct acpi_hp_work
{
1131 struct work_struct work
;
1132 struct acpi_device
*adev
;
1136 static void acpi_hotplug_work_fn(struct work_struct
*work
)
1138 struct acpi_hp_work
*hpw
= container_of(work
, struct acpi_hp_work
, work
);
1140 acpi_os_wait_events_complete();
1141 acpi_device_hotplug(hpw
->adev
, hpw
->src
);
1145 acpi_status
acpi_hotplug_schedule(struct acpi_device
*adev
, u32 src
)
1147 struct acpi_hp_work
*hpw
;
1149 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
1150 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1153 hpw
= kmalloc(sizeof(*hpw
), GFP_KERNEL
);
1155 return AE_NO_MEMORY
;
1157 INIT_WORK(&hpw
->work
, acpi_hotplug_work_fn
);
1161 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1162 * the hotplug code may call driver .remove() functions, which may
1163 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1166 if (!queue_work(kacpi_hotplug_wq
, &hpw
->work
)) {
1173 bool acpi_queue_hotplug_work(struct work_struct
*work
)
1175 return queue_work(kacpi_hotplug_wq
, work
);
1179 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
1181 struct semaphore
*sem
= NULL
;
1183 sem
= acpi_os_allocate_zeroed(sizeof(struct semaphore
));
1185 return AE_NO_MEMORY
;
1187 sema_init(sem
, initial_units
);
1189 *handle
= (acpi_handle
*) sem
;
1191 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
1192 *handle
, initial_units
));
1198 * TODO: A better way to delete semaphores? Linux doesn't have a
1199 * 'delete_semaphore()' function -- may result in an invalid
1200 * pointer dereference for non-synchronized consumers. Should
1201 * we at least check for blocked threads and signal/cancel them?
1204 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
1206 struct semaphore
*sem
= (struct semaphore
*)handle
;
1209 return AE_BAD_PARAMETER
;
1211 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
1213 BUG_ON(!list_empty(&sem
->wait_list
));
1221 * TODO: Support for units > 1?
1223 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
1225 acpi_status status
= AE_OK
;
1226 struct semaphore
*sem
= (struct semaphore
*)handle
;
1230 if (!acpi_os_initialized
)
1233 if (!sem
|| (units
< 1))
1234 return AE_BAD_PARAMETER
;
1239 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
1240 handle
, units
, timeout
));
1242 if (timeout
== ACPI_WAIT_FOREVER
)
1243 jiffies
= MAX_SCHEDULE_TIMEOUT
;
1245 jiffies
= msecs_to_jiffies(timeout
);
1247 ret
= down_timeout(sem
, jiffies
);
1251 if (ACPI_FAILURE(status
)) {
1252 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
1253 "Failed to acquire semaphore[%p|%d|%d], %s",
1254 handle
, units
, timeout
,
1255 acpi_format_exception(status
)));
1257 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
1258 "Acquired semaphore[%p|%d|%d]", handle
,
1266 * TODO: Support for units > 1?
1268 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
1270 struct semaphore
*sem
= (struct semaphore
*)handle
;
1272 if (!acpi_os_initialized
)
1275 if (!sem
|| (units
< 1))
1276 return AE_BAD_PARAMETER
;
1281 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
1289 acpi_status
acpi_os_get_line(char *buffer
, u32 buffer_length
, u32
*bytes_read
)
1291 #ifdef ENABLE_DEBUGGER
1292 if (acpi_in_debugger
) {
1295 kdb_read(buffer
, buffer_length
);
1297 /* remove the CR kdb includes */
1298 chars
= strlen(buffer
) - 1;
1299 buffer
[chars
] = '\0';
1304 ret
= acpi_debugger_read_cmd(buffer
, buffer_length
);
1313 EXPORT_SYMBOL(acpi_os_get_line
);
1315 acpi_status
acpi_os_wait_command_ready(void)
1319 ret
= acpi_debugger_wait_command_ready();
1325 acpi_status
acpi_os_notify_command_complete(void)
1329 ret
= acpi_debugger_notify_command_complete();
1335 acpi_status
acpi_os_signal(u32 function
, void *info
)
1338 case ACPI_SIGNAL_FATAL
:
1339 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
1341 case ACPI_SIGNAL_BREAKPOINT
:
1344 * ACPI spec. says to treat it as a NOP unless
1345 * you are debugging. So if/when we integrate
1346 * AML debugger into the kernel debugger its
1347 * hook will go here. But until then it is
1348 * not useful to print anything on breakpoints.
1358 static int __init
acpi_os_name_setup(char *str
)
1360 char *p
= acpi_os_name
;
1361 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
1366 for (; count
-- && *str
; str
++) {
1367 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
1369 else if (*str
== '\'' || *str
== '"')
1380 __setup("acpi_os_name=", acpi_os_name_setup
);
1383 * Disable the auto-serialization of named objects creation methods.
1385 * This feature is enabled by default. It marks the AML control methods
1386 * that contain the opcodes to create named objects as "Serialized".
1388 static int __init
acpi_no_auto_serialize_setup(char *str
)
1390 acpi_gbl_auto_serialize_methods
= FALSE
;
1391 pr_info("ACPI: auto-serialization disabled\n");
1396 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup
);
1398 /* Check of resource interference between native drivers and ACPI
1399 * OperationRegions (SystemIO and System Memory only).
1400 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1401 * in arbitrary AML code and can interfere with legacy drivers.
1402 * acpi_enforce_resources= can be set to:
1404 * - strict (default) (2)
1405 * -> further driver trying to access the resources will not load
1407 * -> further driver trying to access the resources will load, but you
1408 * get a system message that something might go wrong...
1411 * -> ACPI Operation Region resources will not be registered
1414 #define ENFORCE_RESOURCES_STRICT 2
1415 #define ENFORCE_RESOURCES_LAX 1
1416 #define ENFORCE_RESOURCES_NO 0
1418 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1420 static int __init
acpi_enforce_resources_setup(char *str
)
1422 if (str
== NULL
|| *str
== '\0')
1425 if (!strcmp("strict", str
))
1426 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1427 else if (!strcmp("lax", str
))
1428 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1429 else if (!strcmp("no", str
))
1430 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1435 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1437 /* Check for resource conflicts between ACPI OperationRegions and native
1439 int acpi_check_resource_conflict(const struct resource
*res
)
1441 acpi_adr_space_type space_id
;
1446 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1448 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1451 if (res
->flags
& IORESOURCE_IO
)
1452 space_id
= ACPI_ADR_SPACE_SYSTEM_IO
;
1454 space_id
= ACPI_ADR_SPACE_SYSTEM_MEMORY
;
1456 length
= resource_size(res
);
1457 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
)
1459 clash
= acpi_check_address_range(space_id
, res
->start
, length
, warn
);
1462 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1463 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1464 printk(KERN_NOTICE
"ACPI: This conflict may"
1465 " cause random problems and system"
1467 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1468 " for this device, you should use it instead of"
1469 " the native driver\n");
1471 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1476 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1478 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1481 struct resource res
= {
1483 .end
= start
+ n
- 1,
1485 .flags
= IORESOURCE_IO
,
1488 return acpi_check_resource_conflict(&res
);
1490 EXPORT_SYMBOL(acpi_check_region
);
1492 static acpi_status
acpi_deactivate_mem_region(acpi_handle handle
, u32 level
,
1493 void *_res
, void **return_value
)
1495 struct acpi_mem_space_context
**mem_ctx
;
1496 union acpi_operand_object
*handler_obj
;
1497 union acpi_operand_object
*region_obj2
;
1498 union acpi_operand_object
*region_obj
;
1499 struct resource
*res
= _res
;
1502 region_obj
= acpi_ns_get_attached_object(handle
);
1506 handler_obj
= region_obj
->region
.handler
;
1510 if (region_obj
->region
.space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
1513 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
))
1516 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
1520 mem_ctx
= (void *)®ion_obj2
->extra
.region_context
;
1522 if (!(mem_ctx
[0]->address
>= res
->start
&&
1523 mem_ctx
[0]->address
< res
->end
))
1526 status
= handler_obj
->address_space
.setup(region_obj
,
1527 ACPI_REGION_DEACTIVATE
,
1528 NULL
, (void **)mem_ctx
);
1529 if (ACPI_SUCCESS(status
))
1530 region_obj
->region
.flags
&= ~(AOPOBJ_SETUP_COMPLETE
);
1536 * acpi_release_memory - Release any mappings done to a memory region
1537 * @handle: Handle to namespace node
1538 * @res: Memory resource
1539 * @level: A level that terminates the search
1541 * Walks through @handle and unmaps all SystemMemory Operation Regions that
1542 * overlap with @res and that have already been activated (mapped).
1544 * This is a helper that allows drivers to place special requirements on memory
1545 * region that may overlap with operation regions, primarily allowing them to
1546 * safely map the region as non-cached memory.
1548 * The unmapped Operation Regions will be automatically remapped next time they
1549 * are called, so the drivers do not need to do anything else.
1551 acpi_status
acpi_release_memory(acpi_handle handle
, struct resource
*res
,
1554 if (!(res
->flags
& IORESOURCE_MEM
))
1557 return acpi_walk_namespace(ACPI_TYPE_REGION
, handle
, level
,
1558 acpi_deactivate_mem_region
, NULL
, res
, NULL
);
1560 EXPORT_SYMBOL_GPL(acpi_release_memory
);
1563 * Let drivers know whether the resource checks are effective
1565 int acpi_resources_are_enforced(void)
1567 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1569 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1572 * Deallocate the memory for a spinlock.
1574 void acpi_os_delete_lock(acpi_spinlock handle
)
1580 * Acquire a spinlock.
1582 * handle is a pointer to the spinlock_t.
1585 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1587 acpi_cpu_flags flags
;
1588 spin_lock_irqsave(lockp
, flags
);
1593 * Release a spinlock. See above.
1596 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1598 spin_unlock_irqrestore(lockp
, flags
);
1601 #ifndef ACPI_USE_LOCAL_CACHE
1603 /*******************************************************************************
1605 * FUNCTION: acpi_os_create_cache
1607 * PARAMETERS: name - Ascii name for the cache
1608 * size - Size of each cached object
1609 * depth - Maximum depth of the cache (in objects) <ignored>
1610 * cache - Where the new cache object is returned
1614 * DESCRIPTION: Create a cache object
1616 ******************************************************************************/
1619 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1621 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1628 /*******************************************************************************
1630 * FUNCTION: acpi_os_purge_cache
1632 * PARAMETERS: Cache - Handle to cache object
1636 * DESCRIPTION: Free all objects within the requested cache.
1638 ******************************************************************************/
1640 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1642 kmem_cache_shrink(cache
);
1646 /*******************************************************************************
1648 * FUNCTION: acpi_os_delete_cache
1650 * PARAMETERS: Cache - Handle to cache object
1654 * DESCRIPTION: Free all objects within the requested cache and delete the
1657 ******************************************************************************/
1659 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1661 kmem_cache_destroy(cache
);
1665 /*******************************************************************************
1667 * FUNCTION: acpi_os_release_object
1669 * PARAMETERS: Cache - Handle to cache object
1670 * Object - The object to be released
1674 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1675 * the object is deleted.
1677 ******************************************************************************/
1679 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1681 kmem_cache_free(cache
, object
);
1686 static int __init
acpi_no_static_ssdt_setup(char *s
)
1688 acpi_gbl_disable_ssdt_table_install
= TRUE
;
1689 pr_info("ACPI: static SSDT installation disabled\n");
1694 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup
);
1696 static int __init
acpi_disable_return_repair(char *s
)
1698 printk(KERN_NOTICE PREFIX
1699 "ACPI: Predefined validation mechanism disabled\n");
1700 acpi_gbl_disable_auto_repair
= TRUE
;
1705 __setup("acpica_no_return_repair", acpi_disable_return_repair
);
1707 acpi_status __init
acpi_os_initialize(void)
1709 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1710 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1711 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1712 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1713 if (acpi_gbl_FADT
.flags
& ACPI_FADT_RESET_REGISTER
) {
1715 * Use acpi_os_map_generic_address to pre-map the reset
1716 * register if it's in system memory.
1720 rv
= acpi_os_map_generic_address(&acpi_gbl_FADT
.reset_register
);
1721 pr_debug(PREFIX
"%s: map reset_reg status %d\n", __func__
, rv
);
1723 acpi_os_initialized
= true;
1728 acpi_status __init
acpi_os_initialize1(void)
1730 kacpid_wq
= alloc_workqueue("kacpid", 0, 1);
1731 kacpi_notify_wq
= alloc_workqueue("kacpi_notify", 0, 1);
1732 kacpi_hotplug_wq
= alloc_ordered_workqueue("kacpi_hotplug", 0);
1734 BUG_ON(!kacpi_notify_wq
);
1735 BUG_ON(!kacpi_hotplug_wq
);
1740 acpi_status
acpi_os_terminate(void)
1742 if (acpi_irq_handler
) {
1743 acpi_os_remove_interrupt_handler(acpi_gbl_FADT
.sci_interrupt
,
1747 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1748 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1749 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1750 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1751 if (acpi_gbl_FADT
.flags
& ACPI_FADT_RESET_REGISTER
)
1752 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.reset_register
);
1754 destroy_workqueue(kacpid_wq
);
1755 destroy_workqueue(kacpi_notify_wq
);
1756 destroy_workqueue(kacpi_hotplug_wq
);
1761 acpi_status
acpi_os_prepare_sleep(u8 sleep_state
, u32 pm1a_control
,
1765 if (__acpi_os_prepare_sleep
)
1766 rc
= __acpi_os_prepare_sleep(sleep_state
,
1767 pm1a_control
, pm1b_control
);
1771 return AE_CTRL_TERMINATE
;
1776 void acpi_os_set_prepare_sleep(int (*func
)(u8 sleep_state
,
1777 u32 pm1a_ctrl
, u32 pm1b_ctrl
))
1779 __acpi_os_prepare_sleep
= func
;
1782 #if (ACPI_REDUCED_HARDWARE)
1783 acpi_status
acpi_os_prepare_extended_sleep(u8 sleep_state
, u32 val_a
,
1787 if (__acpi_os_prepare_extended_sleep
)
1788 rc
= __acpi_os_prepare_extended_sleep(sleep_state
,
1793 return AE_CTRL_TERMINATE
;
1798 acpi_status
acpi_os_prepare_extended_sleep(u8 sleep_state
, u32 val_a
,
1805 void acpi_os_set_prepare_extended_sleep(int (*func
)(u8 sleep_state
,
1806 u32 val_a
, u32 val_b
))
1808 __acpi_os_prepare_extended_sleep
= func
;
1811 acpi_status
acpi_os_enter_sleep(u8 sleep_state
,
1812 u32 reg_a_value
, u32 reg_b_value
)
1816 if (acpi_gbl_reduced_hardware
)
1817 status
= acpi_os_prepare_extended_sleep(sleep_state
,
1821 status
= acpi_os_prepare_sleep(sleep_state
,
1822 reg_a_value
, reg_b_value
);