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 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/acpi_io.h>
43 #include <linux/efi.h>
44 #include <linux/ioport.h>
45 #include <linux/list.h>
46 #include <linux/jiffies.h>
47 #include <linux/semaphore.h>
50 #include <asm/uaccess.h>
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
56 #define _COMPONENT ACPI_OS_SERVICES
57 ACPI_MODULE_NAME("osl");
58 #define PREFIX "ACPI: "
60 acpi_osd_exec_callback function
;
62 struct work_struct work
;
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
73 /* stuff for debugger support */
75 EXPORT_SYMBOL(acpi_in_debugger
);
77 extern char line_buf
[80];
78 #endif /*ENABLE_DEBUGGER */
80 static acpi_osd_handler acpi_irq_handler
;
81 static void *acpi_irq_context
;
82 static struct workqueue_struct
*kacpid_wq
;
83 static struct workqueue_struct
*kacpi_notify_wq
;
84 struct workqueue_struct
*kacpi_hotplug_wq
;
85 EXPORT_SYMBOL(kacpi_hotplug_wq
);
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
92 struct list_head list
;
94 acpi_physical_address phys
;
96 unsigned long refcount
;
99 static LIST_HEAD(acpi_ioremaps
);
100 static DEFINE_MUTEX(acpi_ioremap_lock
);
102 static void __init
acpi_osi_setup_late(void);
105 * The story of _OSI(Linux)
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
137 static struct osi_linux
{
138 unsigned int enable
:1;
140 unsigned int cmdline
:1;
141 } osi_linux
= {0, 0, 0};
143 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
145 if (!strcmp("Linux", interface
)) {
147 printk_once(KERN_NOTICE FW_BUG PREFIX
148 "BIOS _OSI(Linux) query %s%s\n",
149 osi_linux
.enable
? "honored" : "ignored",
150 osi_linux
.cmdline
? " via cmdline" :
151 osi_linux
.dmi
? " via DMI" : "");
157 static void __init
acpi_request_region (struct acpi_generic_address
*gas
,
158 unsigned int length
, char *desc
)
162 /* Handle possible alignment issues */
163 memcpy(&addr
, &gas
->address
, sizeof(addr
));
164 if (!addr
|| !length
)
167 /* Resources are never freed */
168 if (gas
->space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
169 request_region(addr
, length
, desc
);
170 else if (gas
->space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
)
171 request_mem_region(addr
, length
, desc
);
174 static int __init
acpi_reserve_resources(void)
176 acpi_request_region(&acpi_gbl_FADT
.xpm1a_event_block
, acpi_gbl_FADT
.pm1_event_length
,
177 "ACPI PM1a_EVT_BLK");
179 acpi_request_region(&acpi_gbl_FADT
.xpm1b_event_block
, acpi_gbl_FADT
.pm1_event_length
,
180 "ACPI PM1b_EVT_BLK");
182 acpi_request_region(&acpi_gbl_FADT
.xpm1a_control_block
, acpi_gbl_FADT
.pm1_control_length
,
183 "ACPI PM1a_CNT_BLK");
185 acpi_request_region(&acpi_gbl_FADT
.xpm1b_control_block
, acpi_gbl_FADT
.pm1_control_length
,
186 "ACPI PM1b_CNT_BLK");
188 if (acpi_gbl_FADT
.pm_timer_length
== 4)
189 acpi_request_region(&acpi_gbl_FADT
.xpm_timer_block
, 4, "ACPI PM_TMR");
191 acpi_request_region(&acpi_gbl_FADT
.xpm2_control_block
, acpi_gbl_FADT
.pm2_control_length
,
194 /* Length of GPE blocks must be a non-negative multiple of 2 */
196 if (!(acpi_gbl_FADT
.gpe0_block_length
& 0x1))
197 acpi_request_region(&acpi_gbl_FADT
.xgpe0_block
,
198 acpi_gbl_FADT
.gpe0_block_length
, "ACPI GPE0_BLK");
200 if (!(acpi_gbl_FADT
.gpe1_block_length
& 0x1))
201 acpi_request_region(&acpi_gbl_FADT
.xgpe1_block
,
202 acpi_gbl_FADT
.gpe1_block_length
, "ACPI GPE1_BLK");
206 device_initcall(acpi_reserve_resources
);
208 void acpi_os_printf(const char *fmt
, ...)
212 acpi_os_vprintf(fmt
, args
);
216 void acpi_os_vprintf(const char *fmt
, va_list args
)
218 static char buffer
[512];
220 vsprintf(buffer
, fmt
, args
);
222 #ifdef ENABLE_DEBUGGER
223 if (acpi_in_debugger
) {
224 kdb_printf("%s", buffer
);
226 printk(KERN_CONT
"%s", buffer
);
229 printk(KERN_CONT
"%s", buffer
);
234 static unsigned long acpi_rsdp
;
235 static int __init
setup_acpi_rsdp(char *arg
)
237 acpi_rsdp
= simple_strtoul(arg
, NULL
, 16);
240 early_param("acpi_rsdp", setup_acpi_rsdp
);
243 acpi_physical_address __init
acpi_os_get_root_pointer(void)
251 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
253 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
256 printk(KERN_ERR PREFIX
257 "System description tables not found\n");
261 acpi_physical_address pa
= 0;
263 acpi_find_root_pointer(&pa
);
268 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
269 static struct acpi_ioremap
*
270 acpi_map_lookup(acpi_physical_address phys
, acpi_size size
)
272 struct acpi_ioremap
*map
;
274 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
275 if (map
->phys
<= phys
&&
276 phys
+ size
<= map
->phys
+ map
->size
)
282 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
283 static void __iomem
*
284 acpi_map_vaddr_lookup(acpi_physical_address phys
, unsigned int size
)
286 struct acpi_ioremap
*map
;
288 map
= acpi_map_lookup(phys
, size
);
290 return map
->virt
+ (phys
- map
->phys
);
295 void __iomem
*acpi_os_get_iomem(acpi_physical_address phys
, unsigned int size
)
297 struct acpi_ioremap
*map
;
298 void __iomem
*virt
= NULL
;
300 mutex_lock(&acpi_ioremap_lock
);
301 map
= acpi_map_lookup(phys
, size
);
303 virt
= map
->virt
+ (phys
- map
->phys
);
306 mutex_unlock(&acpi_ioremap_lock
);
309 EXPORT_SYMBOL_GPL(acpi_os_get_iomem
);
311 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
312 static struct acpi_ioremap
*
313 acpi_map_lookup_virt(void __iomem
*virt
, acpi_size size
)
315 struct acpi_ioremap
*map
;
317 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
318 if (map
->virt
<= virt
&&
319 virt
+ size
<= map
->virt
+ map
->size
)
326 #define should_use_kmap(pfn) page_is_ram(pfn)
328 /* ioremap will take care of cache attributes */
329 #define should_use_kmap(pfn) 0
332 static void __iomem
*acpi_map(acpi_physical_address pg_off
, unsigned long pg_sz
)
336 pfn
= pg_off
>> PAGE_SHIFT
;
337 if (should_use_kmap(pfn
)) {
338 if (pg_sz
> PAGE_SIZE
)
340 return (void __iomem __force
*)kmap(pfn_to_page(pfn
));
342 return acpi_os_ioremap(pg_off
, pg_sz
);
345 static void acpi_unmap(acpi_physical_address pg_off
, void __iomem
*vaddr
)
349 pfn
= pg_off
>> PAGE_SHIFT
;
350 if (page_is_ram(pfn
))
351 kunmap(pfn_to_page(pfn
));
356 void __iomem
*__init_refok
357 acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
359 struct acpi_ioremap
*map
;
361 acpi_physical_address pg_off
;
364 if (phys
> ULONG_MAX
) {
365 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
369 if (!acpi_gbl_permanent_mmap
)
370 return __acpi_map_table((unsigned long)phys
, size
);
372 mutex_lock(&acpi_ioremap_lock
);
373 /* Check if there's a suitable mapping already. */
374 map
= acpi_map_lookup(phys
, size
);
380 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
382 mutex_unlock(&acpi_ioremap_lock
);
386 pg_off
= round_down(phys
, PAGE_SIZE
);
387 pg_sz
= round_up(phys
+ size
, PAGE_SIZE
) - pg_off
;
388 virt
= acpi_map(pg_off
, pg_sz
);
390 mutex_unlock(&acpi_ioremap_lock
);
395 INIT_LIST_HEAD(&map
->list
);
401 list_add_tail_rcu(&map
->list
, &acpi_ioremaps
);
404 mutex_unlock(&acpi_ioremap_lock
);
405 return map
->virt
+ (phys
- map
->phys
);
407 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
409 static void acpi_os_drop_map_ref(struct acpi_ioremap
*map
)
411 if (!--map
->refcount
)
412 list_del_rcu(&map
->list
);
415 static void acpi_os_map_cleanup(struct acpi_ioremap
*map
)
417 if (!map
->refcount
) {
419 acpi_unmap(map
->phys
, map
->virt
);
424 void __ref
acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
426 struct acpi_ioremap
*map
;
428 if (!acpi_gbl_permanent_mmap
) {
429 __acpi_unmap_table(virt
, size
);
433 mutex_lock(&acpi_ioremap_lock
);
434 map
= acpi_map_lookup_virt(virt
, size
);
436 mutex_unlock(&acpi_ioremap_lock
);
437 WARN(true, PREFIX
"%s: bad address %p\n", __func__
, virt
);
440 acpi_os_drop_map_ref(map
);
441 mutex_unlock(&acpi_ioremap_lock
);
443 acpi_os_map_cleanup(map
);
445 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
447 void __init
early_acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
449 if (!acpi_gbl_permanent_mmap
)
450 __acpi_unmap_table(virt
, size
);
453 int acpi_os_map_generic_address(struct acpi_generic_address
*gas
)
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 virt
= acpi_os_map_memory(addr
, gas
->bit_width
/ 8);
472 EXPORT_SYMBOL(acpi_os_map_generic_address
);
474 void acpi_os_unmap_generic_address(struct acpi_generic_address
*gas
)
477 struct acpi_ioremap
*map
;
479 if (gas
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
482 /* Handle possible alignment issues */
483 memcpy(&addr
, &gas
->address
, sizeof(addr
));
484 if (!addr
|| !gas
->bit_width
)
487 mutex_lock(&acpi_ioremap_lock
);
488 map
= acpi_map_lookup(addr
, gas
->bit_width
/ 8);
490 mutex_unlock(&acpi_ioremap_lock
);
493 acpi_os_drop_map_ref(map
);
494 mutex_unlock(&acpi_ioremap_lock
);
496 acpi_os_map_cleanup(map
);
498 EXPORT_SYMBOL(acpi_os_unmap_generic_address
);
500 #ifdef ACPI_FUTURE_USAGE
502 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
505 return AE_BAD_PARAMETER
;
507 *phys
= virt_to_phys(virt
);
513 #define ACPI_MAX_OVERRIDE_LEN 100
515 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
518 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
519 acpi_string
* new_val
)
521 if (!init_val
|| !new_val
)
522 return AE_BAD_PARAMETER
;
525 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
526 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
528 *new_val
= acpi_os_name
;
535 acpi_os_table_override(struct acpi_table_header
* existing_table
,
536 struct acpi_table_header
** new_table
)
538 if (!existing_table
|| !new_table
)
539 return AE_BAD_PARAMETER
;
543 #ifdef CONFIG_ACPI_CUSTOM_DSDT
544 if (strncmp(existing_table
->signature
, "DSDT", 4) == 0)
545 *new_table
= (struct acpi_table_header
*)AmlCode
;
547 if (*new_table
!= NULL
) {
548 printk(KERN_WARNING PREFIX
"Override [%4.4s-%8.8s], "
549 "this is unsafe: tainting kernel\n",
550 existing_table
->signature
,
551 existing_table
->oem_table_id
);
552 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE
);
557 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
561 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
567 acpi_irq_not_handled
++;
573 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
578 acpi_irq_stats_init();
581 * ACPI interrupts different from the SCI in our copy of the FADT are
584 if (gsi
!= acpi_gbl_FADT
.sci_interrupt
)
585 return AE_BAD_PARAMETER
;
587 if (acpi_irq_handler
)
588 return AE_ALREADY_ACQUIRED
;
590 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
591 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
596 acpi_irq_handler
= handler
;
597 acpi_irq_context
= context
;
598 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
599 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
600 acpi_irq_handler
= NULL
;
601 return AE_NOT_ACQUIRED
;
607 acpi_status
acpi_os_remove_interrupt_handler(u32 irq
, acpi_osd_handler handler
)
609 if (irq
!= acpi_gbl_FADT
.sci_interrupt
)
610 return AE_BAD_PARAMETER
;
612 free_irq(irq
, acpi_irq
);
613 acpi_irq_handler
= NULL
;
619 * Running in interpreter thread context, safe to sleep
622 void acpi_os_sleep(u64 ms
)
624 schedule_timeout_interruptible(msecs_to_jiffies(ms
));
627 void acpi_os_stall(u32 us
)
635 touch_nmi_watchdog();
641 * Support ACPI 3.0 AML Timer operand
642 * Returns 64-bit free-running, monotonically increasing timer
643 * with 100ns granularity
645 u64
acpi_os_get_timer(void)
650 /* TBD: use HPET if available */
653 #ifdef CONFIG_X86_PM_TIMER
654 /* TBD: default to PM timer if HPET was not available */
657 printk(KERN_ERR PREFIX
"acpi_os_get_timer() TBD\n");
662 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
671 *(u8
*) value
= inb(port
);
672 } else if (width
<= 16) {
673 *(u16
*) value
= inw(port
);
674 } else if (width
<= 32) {
675 *(u32
*) value
= inl(port
);
683 EXPORT_SYMBOL(acpi_os_read_port
);
685 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
689 } else if (width
<= 16) {
691 } else if (width
<= 32) {
700 EXPORT_SYMBOL(acpi_os_write_port
);
703 acpi_os_read_memory(acpi_physical_address phys_addr
, u32
* value
, u32 width
)
705 void __iomem
*virt_addr
;
706 unsigned int size
= width
/ 8;
711 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
714 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
716 return AE_BAD_ADDRESS
;
725 *(u8
*) value
= readb(virt_addr
);
728 *(u16
*) value
= readw(virt_addr
);
731 *(u32
*) value
= readl(virt_addr
);
746 static inline u64
read64(const volatile void __iomem
*addr
)
751 static inline u64
read64(const volatile void __iomem
*addr
)
756 return l
| (h
<< 32);
761 acpi_os_read_memory64(acpi_physical_address phys_addr
, u64
*value
, u32 width
)
763 void __iomem
*virt_addr
;
764 unsigned int size
= width
/ 8;
769 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
772 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
774 return AE_BAD_ADDRESS
;
783 *(u8
*) value
= readb(virt_addr
);
786 *(u16
*) value
= readw(virt_addr
);
789 *(u32
*) value
= readl(virt_addr
);
792 *(u64
*) value
= read64(virt_addr
);
807 acpi_os_write_memory(acpi_physical_address phys_addr
, u32 value
, u32 width
)
809 void __iomem
*virt_addr
;
810 unsigned int size
= width
/ 8;
814 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
817 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
819 return AE_BAD_ADDRESS
;
825 writeb(value
, virt_addr
);
828 writew(value
, virt_addr
);
831 writel(value
, virt_addr
);
846 static inline void write64(u64 val
, volatile void __iomem
*addr
)
851 static inline void write64(u64 val
, volatile void __iomem
*addr
)
854 writel(val
>>32, addr
+4);
859 acpi_os_write_memory64(acpi_physical_address phys_addr
, u64 value
, u32 width
)
861 void __iomem
*virt_addr
;
862 unsigned int size
= width
/ 8;
866 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
869 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
871 return AE_BAD_ADDRESS
;
877 writeb(value
, virt_addr
);
880 writew(value
, virt_addr
);
883 writel(value
, virt_addr
);
886 write64(value
, virt_addr
);
901 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
902 u64
*value
, u32 width
)
908 return AE_BAD_PARAMETER
;
924 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
925 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
926 reg
, size
, &value32
);
929 return (result
? AE_ERROR
: AE_OK
);
933 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
934 u64 value
, u32 width
)
952 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
953 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
956 return (result
? AE_ERROR
: AE_OK
);
959 static void acpi_os_execute_deferred(struct work_struct
*work
)
961 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
964 acpi_os_wait_events_complete(NULL
);
966 dpc
->function(dpc
->context
);
970 /*******************************************************************************
972 * FUNCTION: acpi_os_execute
974 * PARAMETERS: Type - Type of the callback
975 * Function - Function to be executed
976 * Context - Function parameters
980 * DESCRIPTION: Depending on type, either queues function for deferred execution or
981 * immediately executes function on a separate thread.
983 ******************************************************************************/
985 static acpi_status
__acpi_os_execute(acpi_execute_type type
,
986 acpi_osd_exec_callback function
, void *context
, int hp
)
988 acpi_status status
= AE_OK
;
989 struct acpi_os_dpc
*dpc
;
990 struct workqueue_struct
*queue
;
992 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
993 "Scheduling function [%p(%p)] for deferred execution.\n",
997 * Allocate/initialize DPC structure. Note that this memory will be
998 * freed by the callee. The kernel handles the work_struct list in a
999 * way that allows us to also free its memory inside the callee.
1000 * Because we may want to schedule several tasks with different
1001 * parameters we can't use the approach some kernel code uses of
1002 * having a static work_struct.
1005 dpc
= kmalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
1007 return AE_NO_MEMORY
;
1009 dpc
->function
= function
;
1010 dpc
->context
= context
;
1013 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1014 * because the hotplug code may call driver .remove() functions,
1015 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1016 * to flush these workqueues.
1018 queue
= hp
? kacpi_hotplug_wq
:
1019 (type
== OSL_NOTIFY_HANDLER
? kacpi_notify_wq
: kacpid_wq
);
1020 dpc
->wait
= hp
? 1 : 0;
1022 if (queue
== kacpi_hotplug_wq
)
1023 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1024 else if (queue
== kacpi_notify_wq
)
1025 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1027 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1030 * On some machines, a software-initiated SMI causes corruption unless
1031 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1032 * typically it's done in GPE-related methods that are run via
1033 * workqueues, so we can avoid the known corruption cases by always
1034 * queueing on CPU 0.
1036 ret
= queue_work_on(0, queue
, &dpc
->work
);
1039 printk(KERN_ERR PREFIX
1040 "Call to queue_work() failed.\n");
1047 acpi_status
acpi_os_execute(acpi_execute_type type
,
1048 acpi_osd_exec_callback function
, void *context
)
1050 return __acpi_os_execute(type
, function
, context
, 0);
1052 EXPORT_SYMBOL(acpi_os_execute
);
1054 acpi_status
acpi_os_hotplug_execute(acpi_osd_exec_callback function
,
1057 return __acpi_os_execute(0, function
, context
, 1);
1060 void acpi_os_wait_events_complete(void *context
)
1062 flush_workqueue(kacpid_wq
);
1063 flush_workqueue(kacpi_notify_wq
);
1066 EXPORT_SYMBOL(acpi_os_wait_events_complete
);
1069 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
1071 struct semaphore
*sem
= NULL
;
1073 sem
= acpi_os_allocate(sizeof(struct semaphore
));
1075 return AE_NO_MEMORY
;
1076 memset(sem
, 0, sizeof(struct semaphore
));
1078 sema_init(sem
, initial_units
);
1080 *handle
= (acpi_handle
*) sem
;
1082 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
1083 *handle
, initial_units
));
1089 * TODO: A better way to delete semaphores? Linux doesn't have a
1090 * 'delete_semaphore()' function -- may result in an invalid
1091 * pointer dereference for non-synchronized consumers. Should
1092 * we at least check for blocked threads and signal/cancel them?
1095 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
1097 struct semaphore
*sem
= (struct semaphore
*)handle
;
1100 return AE_BAD_PARAMETER
;
1102 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
1104 BUG_ON(!list_empty(&sem
->wait_list
));
1112 * TODO: Support for units > 1?
1114 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
1116 acpi_status status
= AE_OK
;
1117 struct semaphore
*sem
= (struct semaphore
*)handle
;
1121 if (!sem
|| (units
< 1))
1122 return AE_BAD_PARAMETER
;
1127 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
1128 handle
, units
, timeout
));
1130 if (timeout
== ACPI_WAIT_FOREVER
)
1131 jiffies
= MAX_SCHEDULE_TIMEOUT
;
1133 jiffies
= msecs_to_jiffies(timeout
);
1135 ret
= down_timeout(sem
, jiffies
);
1139 if (ACPI_FAILURE(status
)) {
1140 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
1141 "Failed to acquire semaphore[%p|%d|%d], %s",
1142 handle
, units
, timeout
,
1143 acpi_format_exception(status
)));
1145 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
1146 "Acquired semaphore[%p|%d|%d]", handle
,
1154 * TODO: Support for units > 1?
1156 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
1158 struct semaphore
*sem
= (struct semaphore
*)handle
;
1160 if (!sem
|| (units
< 1))
1161 return AE_BAD_PARAMETER
;
1166 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
1174 #ifdef ACPI_FUTURE_USAGE
1175 u32
acpi_os_get_line(char *buffer
)
1178 #ifdef ENABLE_DEBUGGER
1179 if (acpi_in_debugger
) {
1182 kdb_read(buffer
, sizeof(line_buf
));
1184 /* remove the CR kdb includes */
1185 chars
= strlen(buffer
) - 1;
1186 buffer
[chars
] = '\0';
1192 #endif /* ACPI_FUTURE_USAGE */
1194 acpi_status
acpi_os_signal(u32 function
, void *info
)
1197 case ACPI_SIGNAL_FATAL
:
1198 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
1200 case ACPI_SIGNAL_BREAKPOINT
:
1203 * ACPI spec. says to treat it as a NOP unless
1204 * you are debugging. So if/when we integrate
1205 * AML debugger into the kernel debugger its
1206 * hook will go here. But until then it is
1207 * not useful to print anything on breakpoints.
1217 static int __init
acpi_os_name_setup(char *str
)
1219 char *p
= acpi_os_name
;
1220 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
1225 for (; count
-- && str
&& *str
; str
++) {
1226 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
1228 else if (*str
== '\'' || *str
== '"')
1239 __setup("acpi_os_name=", acpi_os_name_setup
);
1241 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1242 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1244 struct osi_setup_entry
{
1245 char string
[OSI_STRING_LENGTH_MAX
];
1249 static struct osi_setup_entry __initdata
1250 osi_setup_entries
[OSI_STRING_ENTRIES_MAX
] = {
1251 {"Module Device", true},
1252 {"Processor Device", true},
1253 {"3.0 _SCP Extensions", true},
1254 {"Processor Aggregator Device", true},
1257 void __init
acpi_osi_setup(char *str
)
1259 struct osi_setup_entry
*osi
;
1263 if (!acpi_gbl_create_osi_method
)
1266 if (str
== NULL
|| *str
== '\0') {
1267 printk(KERN_INFO PREFIX
"_OSI method disabled\n");
1268 acpi_gbl_create_osi_method
= FALSE
;
1277 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1278 osi
= &osi_setup_entries
[i
];
1279 if (!strcmp(osi
->string
, str
)) {
1280 osi
->enable
= enable
;
1282 } else if (osi
->string
[0] == '\0') {
1283 osi
->enable
= enable
;
1284 strncpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
1290 static void __init
set_osi_linux(unsigned int enable
)
1292 if (osi_linux
.enable
!= enable
)
1293 osi_linux
.enable
= enable
;
1295 if (osi_linux
.enable
)
1296 acpi_osi_setup("Linux");
1298 acpi_osi_setup("!Linux");
1303 static void __init
acpi_cmdline_osi_linux(unsigned int enable
)
1305 osi_linux
.cmdline
= 1; /* cmdline set the default and override DMI */
1307 set_osi_linux(enable
);
1312 void __init
acpi_dmi_osi_linux(int enable
, const struct dmi_system_id
*d
)
1314 printk(KERN_NOTICE PREFIX
"DMI detected: %s\n", d
->ident
);
1319 osi_linux
.dmi
= 1; /* DMI knows that this box asks OSI(Linux) */
1320 set_osi_linux(enable
);
1326 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1328 * empty string disables _OSI
1329 * string starting with '!' disables that string
1330 * otherwise string is added to list, augmenting built-in strings
1332 static void __init
acpi_osi_setup_late(void)
1334 struct osi_setup_entry
*osi
;
1339 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1340 osi
= &osi_setup_entries
[i
];
1346 status
= acpi_install_interface(str
);
1348 if (ACPI_SUCCESS(status
))
1349 printk(KERN_INFO PREFIX
"Added _OSI(%s)\n", str
);
1351 status
= acpi_remove_interface(str
);
1353 if (ACPI_SUCCESS(status
))
1354 printk(KERN_INFO PREFIX
"Deleted _OSI(%s)\n", str
);
1359 static int __init
osi_setup(char *str
)
1361 if (str
&& !strcmp("Linux", str
))
1362 acpi_cmdline_osi_linux(1);
1363 else if (str
&& !strcmp("!Linux", str
))
1364 acpi_cmdline_osi_linux(0);
1366 acpi_osi_setup(str
);
1371 __setup("acpi_osi=", osi_setup
);
1373 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1374 static int __init
acpi_serialize_setup(char *str
)
1376 printk(KERN_INFO PREFIX
"serialize enabled\n");
1378 acpi_gbl_all_methods_serialized
= TRUE
;
1383 __setup("acpi_serialize", acpi_serialize_setup
);
1385 /* Check of resource interference between native drivers and ACPI
1386 * OperationRegions (SystemIO and System Memory only).
1387 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1388 * in arbitrary AML code and can interfere with legacy drivers.
1389 * acpi_enforce_resources= can be set to:
1391 * - strict (default) (2)
1392 * -> further driver trying to access the resources will not load
1394 * -> further driver trying to access the resources will load, but you
1395 * get a system message that something might go wrong...
1398 * -> ACPI Operation Region resources will not be registered
1401 #define ENFORCE_RESOURCES_STRICT 2
1402 #define ENFORCE_RESOURCES_LAX 1
1403 #define ENFORCE_RESOURCES_NO 0
1405 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1407 static int __init
acpi_enforce_resources_setup(char *str
)
1409 if (str
== NULL
|| *str
== '\0')
1412 if (!strcmp("strict", str
))
1413 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1414 else if (!strcmp("lax", str
))
1415 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1416 else if (!strcmp("no", str
))
1417 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1422 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1424 /* Check for resource conflicts between ACPI OperationRegions and native
1426 int acpi_check_resource_conflict(const struct resource
*res
)
1428 acpi_adr_space_type space_id
;
1433 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1435 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1438 if (res
->flags
& IORESOURCE_IO
)
1439 space_id
= ACPI_ADR_SPACE_SYSTEM_IO
;
1441 space_id
= ACPI_ADR_SPACE_SYSTEM_MEMORY
;
1443 length
= res
->end
- res
->start
+ 1;
1444 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
)
1446 clash
= acpi_check_address_range(space_id
, res
->start
, length
, warn
);
1449 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1450 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1451 printk(KERN_NOTICE
"ACPI: This conflict may"
1452 " cause random problems and system"
1454 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1455 " for this device, you should use it instead of"
1456 " the native driver\n");
1458 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1463 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1465 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1468 struct resource res
= {
1470 .end
= start
+ n
- 1,
1472 .flags
= IORESOURCE_IO
,
1475 return acpi_check_resource_conflict(&res
);
1477 EXPORT_SYMBOL(acpi_check_region
);
1480 * Let drivers know whether the resource checks are effective
1482 int acpi_resources_are_enforced(void)
1484 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1486 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1489 * Deallocate the memory for a spinlock.
1491 void acpi_os_delete_lock(acpi_spinlock handle
)
1497 * Acquire a spinlock.
1499 * handle is a pointer to the spinlock_t.
1502 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1504 acpi_cpu_flags flags
;
1505 spin_lock_irqsave(lockp
, flags
);
1510 * Release a spinlock. See above.
1513 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1515 spin_unlock_irqrestore(lockp
, flags
);
1518 #ifndef ACPI_USE_LOCAL_CACHE
1520 /*******************************************************************************
1522 * FUNCTION: acpi_os_create_cache
1524 * PARAMETERS: name - Ascii name for the cache
1525 * size - Size of each cached object
1526 * depth - Maximum depth of the cache (in objects) <ignored>
1527 * cache - Where the new cache object is returned
1531 * DESCRIPTION: Create a cache object
1533 ******************************************************************************/
1536 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1538 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1545 /*******************************************************************************
1547 * FUNCTION: acpi_os_purge_cache
1549 * PARAMETERS: Cache - Handle to cache object
1553 * DESCRIPTION: Free all objects within the requested cache.
1555 ******************************************************************************/
1557 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1559 kmem_cache_shrink(cache
);
1563 /*******************************************************************************
1565 * FUNCTION: acpi_os_delete_cache
1567 * PARAMETERS: Cache - Handle to cache object
1571 * DESCRIPTION: Free all objects within the requested cache and delete the
1574 ******************************************************************************/
1576 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1578 kmem_cache_destroy(cache
);
1582 /*******************************************************************************
1584 * FUNCTION: acpi_os_release_object
1586 * PARAMETERS: Cache - Handle to cache object
1587 * Object - The object to be released
1591 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1592 * the object is deleted.
1594 ******************************************************************************/
1596 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1598 kmem_cache_free(cache
, object
);
1603 acpi_status __init
acpi_os_initialize(void)
1605 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1606 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1607 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1608 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1613 acpi_status __init
acpi_os_initialize1(void)
1615 kacpid_wq
= alloc_workqueue("kacpid", 0, 1);
1616 kacpi_notify_wq
= alloc_workqueue("kacpi_notify", 0, 1);
1617 kacpi_hotplug_wq
= alloc_workqueue("kacpi_hotplug", 0, 1);
1619 BUG_ON(!kacpi_notify_wq
);
1620 BUG_ON(!kacpi_hotplug_wq
);
1621 acpi_install_interface_handler(acpi_osi_handler
);
1622 acpi_osi_setup_late();
1626 acpi_status
acpi_os_terminate(void)
1628 if (acpi_irq_handler
) {
1629 acpi_os_remove_interrupt_handler(acpi_gbl_FADT
.sci_interrupt
,
1633 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1634 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1635 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1636 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1638 destroy_workqueue(kacpid_wq
);
1639 destroy_workqueue(kacpi_notify_wq
);
1640 destroy_workqueue(kacpi_hotplug_wq
);