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/pci.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.h>
40 #include <linux/acpi.h>
41 #include <linux/efi.h>
42 #include <linux/ioport.h>
43 #include <linux/list.h>
44 #include <linux/jiffies.h>
45 #include <linux/semaphore.h>
48 #include <asm/uaccess.h>
50 #include <acpi/acpi.h>
51 #include <acpi/acpi_bus.h>
52 #include <acpi/processor.h>
54 #define _COMPONENT ACPI_OS_SERVICES
55 ACPI_MODULE_NAME("osl");
56 #define PREFIX "ACPI: "
58 acpi_osd_exec_callback function
;
60 struct work_struct work
;
64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
68 #ifdef ENABLE_DEBUGGER
69 #include <linux/kdb.h>
71 /* stuff for debugger support */
73 EXPORT_SYMBOL(acpi_in_debugger
);
75 extern char line_buf
[80];
76 #endif /*ENABLE_DEBUGGER */
78 static unsigned int acpi_irq_irq
;
79 static acpi_osd_handler acpi_irq_handler
;
80 static void *acpi_irq_context
;
81 static struct workqueue_struct
*kacpid_wq
;
82 static struct workqueue_struct
*kacpi_notify_wq
;
83 static struct workqueue_struct
*kacpi_hotplug_wq
;
85 struct acpi_res_list
{
86 resource_size_t start
;
88 acpi_adr_space_type resource_type
; /* IO port, System memory, ...*/
89 char name
[5]; /* only can have a length of 4 chars, make use of this
90 one instead of res->name, no need to kalloc then */
91 struct list_head resource_list
;
95 static LIST_HEAD(resource_list_head
);
96 static DEFINE_SPINLOCK(acpi_res_lock
);
98 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
99 static char osi_additional_string
[OSI_STRING_LENGTH_MAX
];
102 * The story of _OSI(Linux)
104 * From pre-history through Linux-2.6.22,
105 * Linux responded TRUE upon a BIOS OSI(Linux) query.
107 * Unfortunately, reference BIOS writers got wind of this
108 * and put OSI(Linux) in their example code, quickly exposing
109 * this string as ill-conceived and opening the door to
110 * an un-bounded number of BIOS incompatibilities.
112 * For example, OSI(Linux) was used on resume to re-POST a
113 * video card on one system, because Linux at that time
114 * could not do a speedy restore in its native driver.
115 * But then upon gaining quick native restore capability,
116 * Linux has no way to tell the BIOS to skip the time-consuming
117 * POST -- putting Linux at a permanent performance disadvantage.
118 * On another system, the BIOS writer used OSI(Linux)
119 * to infer native OS support for IPMI! On other systems,
120 * OSI(Linux) simply got in the way of Linux claiming to
121 * be compatible with other operating systems, exposing
122 * BIOS issues such as skipped device initialization.
124 * So "Linux" turned out to be a really poor chose of
125 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
127 * BIOS writers should NOT query _OSI(Linux) on future systems.
128 * Linux will complain on the console when it sees it, and return FALSE.
129 * To get Linux to return TRUE for your system will require
130 * a kernel source update to add a DMI entry,
131 * or boot with "acpi_osi=Linux"
134 static struct osi_linux
{
135 unsigned int enable
:1;
137 unsigned int cmdline
:1;
138 unsigned int known
:1;
139 } osi_linux
= { 0, 0, 0, 0};
141 static void __init
acpi_request_region (struct acpi_generic_address
*addr
,
142 unsigned int length
, char *desc
)
144 struct resource
*res
;
146 if (!addr
->address
|| !length
)
149 if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
150 res
= request_region(addr
->address
, length
, desc
);
151 else if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
)
152 res
= request_mem_region(addr
->address
, length
, desc
);
155 static int __init
acpi_reserve_resources(void)
157 acpi_request_region(&acpi_gbl_FADT
.xpm1a_event_block
, acpi_gbl_FADT
.pm1_event_length
,
158 "ACPI PM1a_EVT_BLK");
160 acpi_request_region(&acpi_gbl_FADT
.xpm1b_event_block
, acpi_gbl_FADT
.pm1_event_length
,
161 "ACPI PM1b_EVT_BLK");
163 acpi_request_region(&acpi_gbl_FADT
.xpm1a_control_block
, acpi_gbl_FADT
.pm1_control_length
,
164 "ACPI PM1a_CNT_BLK");
166 acpi_request_region(&acpi_gbl_FADT
.xpm1b_control_block
, acpi_gbl_FADT
.pm1_control_length
,
167 "ACPI PM1b_CNT_BLK");
169 if (acpi_gbl_FADT
.pm_timer_length
== 4)
170 acpi_request_region(&acpi_gbl_FADT
.xpm_timer_block
, 4, "ACPI PM_TMR");
172 acpi_request_region(&acpi_gbl_FADT
.xpm2_control_block
, acpi_gbl_FADT
.pm2_control_length
,
175 /* Length of GPE blocks must be a non-negative multiple of 2 */
177 if (!(acpi_gbl_FADT
.gpe0_block_length
& 0x1))
178 acpi_request_region(&acpi_gbl_FADT
.xgpe0_block
,
179 acpi_gbl_FADT
.gpe0_block_length
, "ACPI GPE0_BLK");
181 if (!(acpi_gbl_FADT
.gpe1_block_length
& 0x1))
182 acpi_request_region(&acpi_gbl_FADT
.xgpe1_block
,
183 acpi_gbl_FADT
.gpe1_block_length
, "ACPI GPE1_BLK");
187 device_initcall(acpi_reserve_resources
);
189 acpi_status __init
acpi_os_initialize(void)
194 acpi_status
acpi_os_initialize1(void)
196 kacpid_wq
= create_workqueue("kacpid");
197 kacpi_notify_wq
= create_workqueue("kacpi_notify");
198 kacpi_hotplug_wq
= create_workqueue("kacpi_hotplug");
200 BUG_ON(!kacpi_notify_wq
);
201 BUG_ON(!kacpi_hotplug_wq
);
205 acpi_status
acpi_os_terminate(void)
207 if (acpi_irq_handler
) {
208 acpi_os_remove_interrupt_handler(acpi_irq_irq
,
212 destroy_workqueue(kacpid_wq
);
213 destroy_workqueue(kacpi_notify_wq
);
214 destroy_workqueue(kacpi_hotplug_wq
);
219 void acpi_os_printf(const char *fmt
, ...)
223 acpi_os_vprintf(fmt
, args
);
227 void acpi_os_vprintf(const char *fmt
, va_list args
)
229 static char buffer
[512];
231 vsprintf(buffer
, fmt
, args
);
233 #ifdef ENABLE_DEBUGGER
234 if (acpi_in_debugger
) {
235 kdb_printf("%s", buffer
);
237 printk(KERN_CONT
"%s", buffer
);
240 printk(KERN_CONT
"%s", buffer
);
244 acpi_physical_address __init
acpi_os_get_root_pointer(void)
247 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
249 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
252 printk(KERN_ERR PREFIX
253 "System description tables not found\n");
257 acpi_physical_address pa
= 0;
259 acpi_find_root_pointer(&pa
);
264 void __iomem
*__init_refok
265 acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
267 if (phys
> ULONG_MAX
) {
268 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
271 if (acpi_gbl_permanent_mmap
)
273 * ioremap checks to ensure this is in reserved space
275 return ioremap((unsigned long)phys
, size
);
277 return __acpi_map_table((unsigned long)phys
, size
);
279 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
281 void __ref
acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
283 if (acpi_gbl_permanent_mmap
)
286 __acpi_unmap_table(virt
, size
);
288 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
290 void __init
early_acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
292 if (!acpi_gbl_permanent_mmap
)
293 __acpi_unmap_table(virt
, size
);
296 #ifdef ACPI_FUTURE_USAGE
298 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
301 return AE_BAD_PARAMETER
;
303 *phys
= virt_to_phys(virt
);
309 #define ACPI_MAX_OVERRIDE_LEN 100
311 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
314 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
315 acpi_string
* new_val
)
317 if (!init_val
|| !new_val
)
318 return AE_BAD_PARAMETER
;
321 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
322 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
324 *new_val
= acpi_os_name
;
331 acpi_os_table_override(struct acpi_table_header
* existing_table
,
332 struct acpi_table_header
** new_table
)
334 if (!existing_table
|| !new_table
)
335 return AE_BAD_PARAMETER
;
339 #ifdef CONFIG_ACPI_CUSTOM_DSDT
340 if (strncmp(existing_table
->signature
, "DSDT", 4) == 0)
341 *new_table
= (struct acpi_table_header
*)AmlCode
;
343 if (*new_table
!= NULL
) {
344 printk(KERN_WARNING PREFIX
"Override [%4.4s-%8.8s], "
345 "this is unsafe: tainting kernel\n",
346 existing_table
->signature
,
347 existing_table
->oem_table_id
);
348 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE
);
353 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
357 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
363 acpi_irq_not_handled
++;
369 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
374 acpi_irq_stats_init();
377 * Ignore the GSI from the core, and use the value in our copy of the
378 * FADT. It may not be the same if an interrupt source override exists
381 gsi
= acpi_gbl_FADT
.sci_interrupt
;
382 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
383 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
388 acpi_irq_handler
= handler
;
389 acpi_irq_context
= context
;
390 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
391 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
392 return AE_NOT_ACQUIRED
;
399 acpi_status
acpi_os_remove_interrupt_handler(u32 irq
, acpi_osd_handler handler
)
402 free_irq(irq
, acpi_irq
);
403 acpi_irq_handler
= NULL
;
411 * Running in interpreter thread context, safe to sleep
414 void acpi_os_sleep(u64 ms
)
416 schedule_timeout_interruptible(msecs_to_jiffies(ms
));
419 void acpi_os_stall(u32 us
)
427 touch_nmi_watchdog();
433 * Support ACPI 3.0 AML Timer operand
434 * Returns 64-bit free-running, monotonically increasing timer
435 * with 100ns granularity
437 u64
acpi_os_get_timer(void)
442 /* TBD: use HPET if available */
445 #ifdef CONFIG_X86_PM_TIMER
446 /* TBD: default to PM timer if HPET was not available */
449 printk(KERN_ERR PREFIX
"acpi_os_get_timer() TBD\n");
454 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
463 *(u8
*) value
= inb(port
);
464 } else if (width
<= 16) {
465 *(u16
*) value
= inw(port
);
466 } else if (width
<= 32) {
467 *(u32
*) value
= inl(port
);
475 EXPORT_SYMBOL(acpi_os_read_port
);
477 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
481 } else if (width
<= 16) {
483 } else if (width
<= 32) {
492 EXPORT_SYMBOL(acpi_os_write_port
);
495 acpi_os_read_memory(acpi_physical_address phys_addr
, u32
* value
, u32 width
)
498 void __iomem
*virt_addr
;
500 virt_addr
= ioremap(phys_addr
, width
);
506 *(u8
*) value
= readb(virt_addr
);
509 *(u16
*) value
= readw(virt_addr
);
512 *(u32
*) value
= readl(virt_addr
);
524 acpi_os_write_memory(acpi_physical_address phys_addr
, u32 value
, u32 width
)
526 void __iomem
*virt_addr
;
528 virt_addr
= ioremap(phys_addr
, width
);
532 writeb(value
, virt_addr
);
535 writew(value
, virt_addr
);
538 writel(value
, virt_addr
);
550 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
551 u32
*value
, u32 width
)
556 return AE_BAD_PARAMETER
;
572 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
573 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
576 return (result
? AE_ERROR
: AE_OK
);
580 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
581 u64 value
, u32 width
)
599 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
600 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
603 return (result
? AE_ERROR
: AE_OK
);
606 /* TODO: Change code to take advantage of driver model more */
607 static void acpi_os_derive_pci_id_2(acpi_handle rhandle
, /* upper bound */
608 acpi_handle chandle
, /* current node */
609 struct acpi_pci_id
**id
,
610 int *is_bridge
, u8
* bus_number
)
613 struct acpi_pci_id
*pci_id
= *id
;
615 unsigned long long temp
;
616 acpi_object_type type
;
618 acpi_get_parent(chandle
, &handle
);
619 if (handle
!= rhandle
) {
620 acpi_os_derive_pci_id_2(rhandle
, handle
, &pci_id
, is_bridge
,
623 status
= acpi_get_type(handle
, &type
);
624 if ((ACPI_FAILURE(status
)) || (type
!= ACPI_TYPE_DEVICE
))
627 status
= acpi_evaluate_integer(handle
, METHOD_NAME__ADR
, NULL
,
629 if (ACPI_SUCCESS(status
)) {
631 pci_id
->device
= ACPI_HIWORD(ACPI_LODWORD(temp
));
632 pci_id
->function
= ACPI_LOWORD(ACPI_LODWORD(temp
));
635 pci_id
->bus
= *bus_number
;
637 /* any nicer way to get bus number of bridge ? */
639 acpi_os_read_pci_configuration(pci_id
, 0x0e, &val
,
641 if (ACPI_SUCCESS(status
)
642 && ((val
& 0x7f) == 1 || (val
& 0x7f) == 2)) {
644 acpi_os_read_pci_configuration(pci_id
, 0x18,
646 if (!ACPI_SUCCESS(status
)) {
647 /* Certainly broken... FIX ME */
653 acpi_os_read_pci_configuration(pci_id
, 0x19,
655 if (ACPI_SUCCESS(status
)) {
664 void acpi_os_derive_pci_id(acpi_handle rhandle
, /* upper bound */
665 acpi_handle chandle
, /* current node */
666 struct acpi_pci_id
**id
)
669 u8 bus_number
= (*id
)->bus
;
671 acpi_os_derive_pci_id_2(rhandle
, chandle
, id
, &is_bridge
, &bus_number
);
674 static void acpi_os_execute_deferred(struct work_struct
*work
)
676 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
679 acpi_os_wait_events_complete(NULL
);
681 dpc
->function(dpc
->context
);
685 /*******************************************************************************
687 * FUNCTION: acpi_os_execute
689 * PARAMETERS: Type - Type of the callback
690 * Function - Function to be executed
691 * Context - Function parameters
695 * DESCRIPTION: Depending on type, either queues function for deferred execution or
696 * immediately executes function on a separate thread.
698 ******************************************************************************/
700 static acpi_status
__acpi_os_execute(acpi_execute_type type
,
701 acpi_osd_exec_callback function
, void *context
, int hp
)
703 acpi_status status
= AE_OK
;
704 struct acpi_os_dpc
*dpc
;
705 struct workqueue_struct
*queue
;
707 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
708 "Scheduling function [%p(%p)] for deferred execution.\n",
712 * Allocate/initialize DPC structure. Note that this memory will be
713 * freed by the callee. The kernel handles the work_struct list in a
714 * way that allows us to also free its memory inside the callee.
715 * Because we may want to schedule several tasks with different
716 * parameters we can't use the approach some kernel code uses of
717 * having a static work_struct.
720 dpc
= kmalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
724 dpc
->function
= function
;
725 dpc
->context
= context
;
728 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
729 * because the hotplug code may call driver .remove() functions,
730 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
731 * to flush these workqueues.
733 queue
= hp
? kacpi_hotplug_wq
:
734 (type
== OSL_NOTIFY_HANDLER
? kacpi_notify_wq
: kacpid_wq
);
735 dpc
->wait
= hp
? 1 : 0;
737 if (queue
== kacpi_hotplug_wq
)
738 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
739 else if (queue
== kacpi_notify_wq
)
740 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
742 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
745 * On some machines, a software-initiated SMI causes corruption unless
746 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
747 * typically it's done in GPE-related methods that are run via
748 * workqueues, so we can avoid the known corruption cases by always
751 ret
= queue_work_on(0, queue
, &dpc
->work
);
754 printk(KERN_ERR PREFIX
755 "Call to queue_work() failed.\n");
762 acpi_status
acpi_os_execute(acpi_execute_type type
,
763 acpi_osd_exec_callback function
, void *context
)
765 return __acpi_os_execute(type
, function
, context
, 0);
767 EXPORT_SYMBOL(acpi_os_execute
);
769 acpi_status
acpi_os_hotplug_execute(acpi_osd_exec_callback function
,
772 return __acpi_os_execute(0, function
, context
, 1);
775 void acpi_os_wait_events_complete(void *context
)
777 flush_workqueue(kacpid_wq
);
778 flush_workqueue(kacpi_notify_wq
);
781 EXPORT_SYMBOL(acpi_os_wait_events_complete
);
784 * Allocate the memory for a spinlock and initialize it.
786 acpi_status
acpi_os_create_lock(acpi_spinlock
* handle
)
788 spin_lock_init(*handle
);
794 * Deallocate the memory for a spinlock.
796 void acpi_os_delete_lock(acpi_spinlock handle
)
802 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
804 struct semaphore
*sem
= NULL
;
806 sem
= acpi_os_allocate(sizeof(struct semaphore
));
809 memset(sem
, 0, sizeof(struct semaphore
));
811 sema_init(sem
, initial_units
);
813 *handle
= (acpi_handle
*) sem
;
815 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
816 *handle
, initial_units
));
822 * TODO: A better way to delete semaphores? Linux doesn't have a
823 * 'delete_semaphore()' function -- may result in an invalid
824 * pointer dereference for non-synchronized consumers. Should
825 * we at least check for blocked threads and signal/cancel them?
828 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
830 struct semaphore
*sem
= (struct semaphore
*)handle
;
833 return AE_BAD_PARAMETER
;
835 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
837 BUG_ON(!list_empty(&sem
->wait_list
));
845 * TODO: Support for units > 1?
847 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
849 acpi_status status
= AE_OK
;
850 struct semaphore
*sem
= (struct semaphore
*)handle
;
854 if (!sem
|| (units
< 1))
855 return AE_BAD_PARAMETER
;
860 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
861 handle
, units
, timeout
));
863 if (timeout
== ACPI_WAIT_FOREVER
)
864 jiffies
= MAX_SCHEDULE_TIMEOUT
;
866 jiffies
= msecs_to_jiffies(timeout
);
868 ret
= down_timeout(sem
, jiffies
);
872 if (ACPI_FAILURE(status
)) {
873 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
874 "Failed to acquire semaphore[%p|%d|%d], %s",
875 handle
, units
, timeout
,
876 acpi_format_exception(status
)));
878 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
879 "Acquired semaphore[%p|%d|%d]", handle
,
887 * TODO: Support for units > 1?
889 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
891 struct semaphore
*sem
= (struct semaphore
*)handle
;
893 if (!sem
|| (units
< 1))
894 return AE_BAD_PARAMETER
;
899 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
907 #ifdef ACPI_FUTURE_USAGE
908 u32
acpi_os_get_line(char *buffer
)
911 #ifdef ENABLE_DEBUGGER
912 if (acpi_in_debugger
) {
915 kdb_read(buffer
, sizeof(line_buf
));
917 /* remove the CR kdb includes */
918 chars
= strlen(buffer
) - 1;
919 buffer
[chars
] = '\0';
925 #endif /* ACPI_FUTURE_USAGE */
927 acpi_status
acpi_os_signal(u32 function
, void *info
)
930 case ACPI_SIGNAL_FATAL
:
931 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
933 case ACPI_SIGNAL_BREAKPOINT
:
936 * ACPI spec. says to treat it as a NOP unless
937 * you are debugging. So if/when we integrate
938 * AML debugger into the kernel debugger its
939 * hook will go here. But until then it is
940 * not useful to print anything on breakpoints.
950 static int __init
acpi_os_name_setup(char *str
)
952 char *p
= acpi_os_name
;
953 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
958 for (; count
-- && str
&& *str
; str
++) {
959 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
961 else if (*str
== '\'' || *str
== '"')
972 __setup("acpi_os_name=", acpi_os_name_setup
);
974 static void __init
set_osi_linux(unsigned int enable
)
976 if (osi_linux
.enable
!= enable
) {
977 osi_linux
.enable
= enable
;
978 printk(KERN_NOTICE PREFIX
"%sed _OSI(Linux)\n",
979 enable
? "Add": "Delet");
984 static void __init
acpi_cmdline_osi_linux(unsigned int enable
)
986 osi_linux
.cmdline
= 1; /* cmdline set the default */
987 set_osi_linux(enable
);
992 void __init
acpi_dmi_osi_linux(int enable
, const struct dmi_system_id
*d
)
994 osi_linux
.dmi
= 1; /* DMI knows that this box asks OSI(Linux) */
996 printk(KERN_NOTICE PREFIX
"DMI detected: %s\n", d
->ident
);
1001 osi_linux
.known
= 1; /* DMI knows which OSI(Linux) default needed */
1003 set_osi_linux(enable
);
1009 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1011 * empty string disables _OSI
1012 * string starting with '!' disables that string
1013 * otherwise string is added to list, augmenting built-in strings
1015 int __init
acpi_osi_setup(char *str
)
1017 if (str
== NULL
|| *str
== '\0') {
1018 printk(KERN_INFO PREFIX
"_OSI method disabled\n");
1019 acpi_gbl_create_osi_method
= FALSE
;
1020 } else if (!strcmp("!Linux", str
)) {
1021 acpi_cmdline_osi_linux(0); /* !enable */
1022 } else if (*str
== '!') {
1023 if (acpi_osi_invalidate(++str
) == AE_OK
)
1024 printk(KERN_INFO PREFIX
"Deleted _OSI(%s)\n", str
);
1025 } else if (!strcmp("Linux", str
)) {
1026 acpi_cmdline_osi_linux(1); /* enable */
1027 } else if (*osi_additional_string
== '\0') {
1028 strncpy(osi_additional_string
, str
, OSI_STRING_LENGTH_MAX
);
1029 printk(KERN_INFO PREFIX
"Added _OSI(%s)\n", str
);
1035 __setup("acpi_osi=", acpi_osi_setup
);
1037 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1038 static int __init
acpi_serialize_setup(char *str
)
1040 printk(KERN_INFO PREFIX
"serialize enabled\n");
1042 acpi_gbl_all_methods_serialized
= TRUE
;
1047 __setup("acpi_serialize", acpi_serialize_setup
);
1049 /* Check of resource interference between native drivers and ACPI
1050 * OperationRegions (SystemIO and System Memory only).
1051 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1052 * in arbitrary AML code and can interfere with legacy drivers.
1053 * acpi_enforce_resources= can be set to:
1055 * - strict (default) (2)
1056 * -> further driver trying to access the resources will not load
1058 * -> further driver trying to access the resources will load, but you
1059 * get a system message that something might go wrong...
1062 * -> ACPI Operation Region resources will not be registered
1065 #define ENFORCE_RESOURCES_STRICT 2
1066 #define ENFORCE_RESOURCES_LAX 1
1067 #define ENFORCE_RESOURCES_NO 0
1069 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1071 static int __init
acpi_enforce_resources_setup(char *str
)
1073 if (str
== NULL
|| *str
== '\0')
1076 if (!strcmp("strict", str
))
1077 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1078 else if (!strcmp("lax", str
))
1079 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1080 else if (!strcmp("no", str
))
1081 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1086 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1088 /* Check for resource conflicts between ACPI OperationRegions and native
1090 int acpi_check_resource_conflict(const struct resource
*res
)
1092 struct acpi_res_list
*res_list_elem
;
1096 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1098 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1101 ioport
= res
->flags
& IORESOURCE_IO
;
1103 spin_lock(&acpi_res_lock
);
1104 list_for_each_entry(res_list_elem
, &resource_list_head
,
1106 if (ioport
&& (res_list_elem
->resource_type
1107 != ACPI_ADR_SPACE_SYSTEM_IO
))
1109 if (!ioport
&& (res_list_elem
->resource_type
1110 != ACPI_ADR_SPACE_SYSTEM_MEMORY
))
1113 if (res
->end
< res_list_elem
->start
1114 || res_list_elem
->end
< res
->start
)
1119 spin_unlock(&acpi_res_lock
);
1122 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1123 printk(KERN_WARNING
"ACPI: resource %s %pR"
1124 " conflicts with ACPI region %s %pR\n",
1125 res
->name
, res
, res_list_elem
->name
,
1127 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1128 printk(KERN_NOTICE
"ACPI: This conflict may"
1129 " cause random problems and system"
1131 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1132 " for this device, you should use it instead of"
1133 " the native driver\n");
1135 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1140 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1142 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1145 struct resource res
= {
1147 .end
= start
+ n
- 1,
1149 .flags
= IORESOURCE_IO
,
1152 return acpi_check_resource_conflict(&res
);
1154 EXPORT_SYMBOL(acpi_check_region
);
1156 int acpi_check_mem_region(resource_size_t start
, resource_size_t n
,
1159 struct resource res
= {
1161 .end
= start
+ n
- 1,
1163 .flags
= IORESOURCE_MEM
,
1166 return acpi_check_resource_conflict(&res
);
1169 EXPORT_SYMBOL(acpi_check_mem_region
);
1172 * Let drivers know whether the resource checks are effective
1174 int acpi_resources_are_enforced(void)
1176 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1178 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1181 * Acquire a spinlock.
1183 * handle is a pointer to the spinlock_t.
1186 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1188 acpi_cpu_flags flags
;
1189 spin_lock_irqsave(lockp
, flags
);
1194 * Release a spinlock. See above.
1197 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1199 spin_unlock_irqrestore(lockp
, flags
);
1202 #ifndef ACPI_USE_LOCAL_CACHE
1204 /*******************************************************************************
1206 * FUNCTION: acpi_os_create_cache
1208 * PARAMETERS: name - Ascii name for the cache
1209 * size - Size of each cached object
1210 * depth - Maximum depth of the cache (in objects) <ignored>
1211 * cache - Where the new cache object is returned
1215 * DESCRIPTION: Create a cache object
1217 ******************************************************************************/
1220 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1222 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1229 /*******************************************************************************
1231 * FUNCTION: acpi_os_purge_cache
1233 * PARAMETERS: Cache - Handle to cache object
1237 * DESCRIPTION: Free all objects within the requested cache.
1239 ******************************************************************************/
1241 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1243 kmem_cache_shrink(cache
);
1247 /*******************************************************************************
1249 * FUNCTION: acpi_os_delete_cache
1251 * PARAMETERS: Cache - Handle to cache object
1255 * DESCRIPTION: Free all objects within the requested cache and delete the
1258 ******************************************************************************/
1260 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1262 kmem_cache_destroy(cache
);
1266 /*******************************************************************************
1268 * FUNCTION: acpi_os_release_object
1270 * PARAMETERS: Cache - Handle to cache object
1271 * Object - The object to be released
1275 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1276 * the object is deleted.
1278 ******************************************************************************/
1280 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1282 kmem_cache_free(cache
, object
);
1286 /******************************************************************************
1288 * FUNCTION: acpi_os_validate_interface
1290 * PARAMETERS: interface - Requested interface to be validated
1292 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise
1294 * DESCRIPTION: Match an interface string to the interfaces supported by the
1295 * host. Strings originate from an AML call to the _OSI method.
1297 *****************************************************************************/
1300 acpi_os_validate_interface (char *interface
)
1302 if (!strncmp(osi_additional_string
, interface
, OSI_STRING_LENGTH_MAX
))
1304 if (!strcmp("Linux", interface
)) {
1306 printk(KERN_NOTICE PREFIX
1307 "BIOS _OSI(Linux) query %s%s\n",
1308 osi_linux
.enable
? "honored" : "ignored",
1309 osi_linux
.cmdline
? " via cmdline" :
1310 osi_linux
.dmi
? " via DMI" : "");
1312 if (osi_linux
.enable
)
1318 static inline int acpi_res_list_add(struct acpi_res_list
*res
)
1320 struct acpi_res_list
*res_list_elem
;
1322 list_for_each_entry(res_list_elem
, &resource_list_head
,
1325 if (res
->resource_type
== res_list_elem
->resource_type
&&
1326 res
->start
== res_list_elem
->start
&&
1327 res
->end
== res_list_elem
->end
) {
1330 * The Region(addr,len) already exist in the list,
1331 * just increase the count
1334 res_list_elem
->count
++;
1340 list_add(&res
->resource_list
, &resource_list_head
);
1344 static inline void acpi_res_list_del(struct acpi_res_list
*res
)
1346 struct acpi_res_list
*res_list_elem
;
1348 list_for_each_entry(res_list_elem
, &resource_list_head
,
1351 if (res
->resource_type
== res_list_elem
->resource_type
&&
1352 res
->start
== res_list_elem
->start
&&
1353 res
->end
== res_list_elem
->end
) {
1356 * If the res count is decreased to 0,
1357 * remove and free it
1360 if (--res_list_elem
->count
== 0) {
1361 list_del(&res_list_elem
->resource_list
);
1362 kfree(res_list_elem
);
1370 acpi_os_invalidate_address(
1372 acpi_physical_address address
,
1375 struct acpi_res_list res
;
1378 case ACPI_ADR_SPACE_SYSTEM_IO
:
1379 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
1380 /* Only interference checks against SystemIO and SystemMemory
1382 res
.start
= address
;
1383 res
.end
= address
+ length
- 1;
1384 res
.resource_type
= space_id
;
1385 spin_lock(&acpi_res_lock
);
1386 acpi_res_list_del(&res
);
1387 spin_unlock(&acpi_res_lock
);
1389 case ACPI_ADR_SPACE_PCI_CONFIG
:
1390 case ACPI_ADR_SPACE_EC
:
1391 case ACPI_ADR_SPACE_SMBUS
:
1392 case ACPI_ADR_SPACE_CMOS
:
1393 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
1394 case ACPI_ADR_SPACE_DATA_TABLE
:
1395 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
1401 /******************************************************************************
1403 * FUNCTION: acpi_os_validate_address
1405 * PARAMETERS: space_id - ACPI space ID
1406 * address - Physical address
1407 * length - Address length
1409 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1410 * should return AE_AML_ILLEGAL_ADDRESS.
1412 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1413 * the addresses accessed by AML operation regions.
1415 *****************************************************************************/
1418 acpi_os_validate_address (
1420 acpi_physical_address address
,
1424 struct acpi_res_list
*res
;
1426 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1430 case ACPI_ADR_SPACE_SYSTEM_IO
:
1431 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
1432 /* Only interference checks against SystemIO and SystemMemory
1434 res
= kzalloc(sizeof(struct acpi_res_list
), GFP_KERNEL
);
1437 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1438 strlcpy(res
->name
, name
, 5);
1439 res
->start
= address
;
1440 res
->end
= address
+ length
- 1;
1441 res
->resource_type
= space_id
;
1442 spin_lock(&acpi_res_lock
);
1443 added
= acpi_res_list_add(res
);
1444 spin_unlock(&acpi_res_lock
);
1445 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1446 "name: %s\n", added
? "Added" : "Already exist",
1447 (space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
1448 ? "SystemIO" : "System Memory",
1449 (unsigned long long)res
->start
,
1450 (unsigned long long)res
->end
,
1455 case ACPI_ADR_SPACE_PCI_CONFIG
:
1456 case ACPI_ADR_SPACE_EC
:
1457 case ACPI_ADR_SPACE_SMBUS
:
1458 case ACPI_ADR_SPACE_CMOS
:
1459 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
1460 case ACPI_ADR_SPACE_DATA_TABLE
:
1461 case ACPI_ADR_SPACE_FIXED_HARDWARE
: