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/acpi_io.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
49 #include <asm/uaccess.h>
51 #include <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
55 #define _COMPONENT ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX "ACPI: "
59 acpi_osd_exec_callback function
;
61 struct work_struct work
;
65 #ifdef CONFIG_ACPI_CUSTOM_DSDT
66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
69 #ifdef ENABLE_DEBUGGER
70 #include <linux/kdb.h>
72 /* stuff for debugger support */
74 EXPORT_SYMBOL(acpi_in_debugger
);
76 extern char line_buf
[80];
77 #endif /*ENABLE_DEBUGGER */
79 static unsigned int acpi_irq_irq
;
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 static struct workqueue_struct
*kacpi_hotplug_wq
;
86 struct acpi_res_list
{
87 resource_size_t start
;
89 acpi_adr_space_type resource_type
; /* IO port, System memory, ...*/
90 char name
[5]; /* only can have a length of 4 chars, make use of this
91 one instead of res->name, no need to kalloc then */
92 struct list_head resource_list
;
96 static LIST_HEAD(resource_list_head
);
97 static DEFINE_SPINLOCK(acpi_res_lock
);
100 * This list of permanent mappings is for memory that may be accessed from
101 * interrupt context, where we can't do the ioremap().
103 struct acpi_ioremap
{
104 struct list_head list
;
106 acpi_physical_address phys
;
111 static LIST_HEAD(acpi_ioremaps
);
112 static DEFINE_SPINLOCK(acpi_ioremap_lock
);
114 static void __init
acpi_osi_setup_late(void);
117 * The story of _OSI(Linux)
119 * From pre-history through Linux-2.6.22,
120 * Linux responded TRUE upon a BIOS OSI(Linux) query.
122 * Unfortunately, reference BIOS writers got wind of this
123 * and put OSI(Linux) in their example code, quickly exposing
124 * this string as ill-conceived and opening the door to
125 * an un-bounded number of BIOS incompatibilities.
127 * For example, OSI(Linux) was used on resume to re-POST a
128 * video card on one system, because Linux at that time
129 * could not do a speedy restore in its native driver.
130 * But then upon gaining quick native restore capability,
131 * Linux has no way to tell the BIOS to skip the time-consuming
132 * POST -- putting Linux at a permanent performance disadvantage.
133 * On another system, the BIOS writer used OSI(Linux)
134 * to infer native OS support for IPMI! On other systems,
135 * OSI(Linux) simply got in the way of Linux claiming to
136 * be compatible with other operating systems, exposing
137 * BIOS issues such as skipped device initialization.
139 * So "Linux" turned out to be a really poor chose of
140 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
142 * BIOS writers should NOT query _OSI(Linux) on future systems.
143 * Linux will complain on the console when it sees it, and return FALSE.
144 * To get Linux to return TRUE for your system will require
145 * a kernel source update to add a DMI entry,
146 * or boot with "acpi_osi=Linux"
149 static struct osi_linux
{
150 unsigned int enable
:1;
152 unsigned int cmdline
:1;
153 } osi_linux
= {0, 0, 0};
155 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
157 if (!strcmp("Linux", interface
)) {
159 printk(KERN_NOTICE FW_BUG PREFIX
160 "BIOS _OSI(Linux) query %s%s\n",
161 osi_linux
.enable
? "honored" : "ignored",
162 osi_linux
.cmdline
? " via cmdline" :
163 osi_linux
.dmi
? " via DMI" : "");
169 static void __init
acpi_request_region (struct acpi_generic_address
*addr
,
170 unsigned int length
, char *desc
)
172 if (!addr
->address
|| !length
)
175 /* Resources are never freed */
176 if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
177 request_region(addr
->address
, length
, desc
);
178 else if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
)
179 request_mem_region(addr
->address
, length
, desc
);
182 static int __init
acpi_reserve_resources(void)
184 acpi_request_region(&acpi_gbl_FADT
.xpm1a_event_block
, acpi_gbl_FADT
.pm1_event_length
,
185 "ACPI PM1a_EVT_BLK");
187 acpi_request_region(&acpi_gbl_FADT
.xpm1b_event_block
, acpi_gbl_FADT
.pm1_event_length
,
188 "ACPI PM1b_EVT_BLK");
190 acpi_request_region(&acpi_gbl_FADT
.xpm1a_control_block
, acpi_gbl_FADT
.pm1_control_length
,
191 "ACPI PM1a_CNT_BLK");
193 acpi_request_region(&acpi_gbl_FADT
.xpm1b_control_block
, acpi_gbl_FADT
.pm1_control_length
,
194 "ACPI PM1b_CNT_BLK");
196 if (acpi_gbl_FADT
.pm_timer_length
== 4)
197 acpi_request_region(&acpi_gbl_FADT
.xpm_timer_block
, 4, "ACPI PM_TMR");
199 acpi_request_region(&acpi_gbl_FADT
.xpm2_control_block
, acpi_gbl_FADT
.pm2_control_length
,
202 /* Length of GPE blocks must be a non-negative multiple of 2 */
204 if (!(acpi_gbl_FADT
.gpe0_block_length
& 0x1))
205 acpi_request_region(&acpi_gbl_FADT
.xgpe0_block
,
206 acpi_gbl_FADT
.gpe0_block_length
, "ACPI GPE0_BLK");
208 if (!(acpi_gbl_FADT
.gpe1_block_length
& 0x1))
209 acpi_request_region(&acpi_gbl_FADT
.xgpe1_block
,
210 acpi_gbl_FADT
.gpe1_block_length
, "ACPI GPE1_BLK");
214 device_initcall(acpi_reserve_resources
);
216 void acpi_os_printf(const char *fmt
, ...)
220 acpi_os_vprintf(fmt
, args
);
224 void acpi_os_vprintf(const char *fmt
, va_list args
)
226 static char buffer
[512];
228 vsprintf(buffer
, fmt
, args
);
230 #ifdef ENABLE_DEBUGGER
231 if (acpi_in_debugger
) {
232 kdb_printf("%s", buffer
);
234 printk(KERN_CONT
"%s", buffer
);
237 printk(KERN_CONT
"%s", buffer
);
241 acpi_physical_address __init
acpi_os_get_root_pointer(void)
244 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
246 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
249 printk(KERN_ERR PREFIX
250 "System description tables not found\n");
254 acpi_physical_address pa
= 0;
256 acpi_find_root_pointer(&pa
);
261 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
262 static struct acpi_ioremap
*
263 acpi_map_lookup(acpi_physical_address phys
, acpi_size size
)
265 struct acpi_ioremap
*map
;
267 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
268 if (map
->phys
<= phys
&&
269 phys
+ size
<= map
->phys
+ map
->size
)
275 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
276 static void __iomem
*
277 acpi_map_vaddr_lookup(acpi_physical_address phys
, unsigned int size
)
279 struct acpi_ioremap
*map
;
281 map
= acpi_map_lookup(phys
, size
);
283 return map
->virt
+ (phys
- map
->phys
);
288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
289 static struct acpi_ioremap
*
290 acpi_map_lookup_virt(void __iomem
*virt
, acpi_size size
)
292 struct acpi_ioremap
*map
;
294 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
295 if (map
->virt
<= virt
&&
296 virt
+ size
<= map
->virt
+ map
->size
)
302 void __iomem
*__init_refok
303 acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
305 struct acpi_ioremap
*map
, *tmp_map
;
308 acpi_physical_address pg_off
;
311 if (phys
> ULONG_MAX
) {
312 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
316 if (!acpi_gbl_permanent_mmap
)
317 return __acpi_map_table((unsigned long)phys
, size
);
319 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
323 pg_off
= round_down(phys
, PAGE_SIZE
);
324 pg_sz
= round_up(phys
+ size
, PAGE_SIZE
) - pg_off
;
325 virt
= acpi_os_ioremap(pg_off
, pg_sz
);
331 INIT_LIST_HEAD(&map
->list
);
335 kref_init(&map
->ref
);
337 spin_lock_irqsave(&acpi_ioremap_lock
, flags
);
338 /* Check if page has already been mapped. */
339 tmp_map
= acpi_map_lookup(phys
, size
);
341 kref_get(&tmp_map
->ref
);
342 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
345 return tmp_map
->virt
+ (phys
- tmp_map
->phys
);
347 list_add_tail_rcu(&map
->list
, &acpi_ioremaps
);
348 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
350 return map
->virt
+ (phys
- map
->phys
);
352 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
354 static void acpi_kref_del_iomap(struct kref
*ref
)
356 struct acpi_ioremap
*map
;
358 map
= container_of(ref
, struct acpi_ioremap
, ref
);
359 list_del_rcu(&map
->list
);
362 void __ref
acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
364 struct acpi_ioremap
*map
;
368 if (!acpi_gbl_permanent_mmap
) {
369 __acpi_unmap_table(virt
, size
);
373 spin_lock_irqsave(&acpi_ioremap_lock
, flags
);
374 map
= acpi_map_lookup_virt(virt
, size
);
376 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
377 printk(KERN_ERR PREFIX
"%s: bad address %p\n", __func__
, virt
);
382 del
= kref_put(&map
->ref
, acpi_kref_del_iomap
);
383 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
392 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
394 void __init
early_acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
396 if (!acpi_gbl_permanent_mmap
)
397 __acpi_unmap_table(virt
, size
);
400 int acpi_os_map_generic_address(struct acpi_generic_address
*addr
)
404 if (addr
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
407 if (!addr
->address
|| !addr
->bit_width
)
410 virt
= acpi_os_map_memory(addr
->address
, addr
->bit_width
/ 8);
416 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address
);
418 void acpi_os_unmap_generic_address(struct acpi_generic_address
*addr
)
422 acpi_size size
= addr
->bit_width
/ 8;
424 if (addr
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
427 if (!addr
->address
|| !addr
->bit_width
)
430 spin_lock_irqsave(&acpi_ioremap_lock
, flags
);
431 virt
= acpi_map_vaddr_lookup(addr
->address
, size
);
432 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
434 acpi_os_unmap_memory(virt
, size
);
436 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address
);
438 #ifdef ACPI_FUTURE_USAGE
440 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
443 return AE_BAD_PARAMETER
;
445 *phys
= virt_to_phys(virt
);
451 #define ACPI_MAX_OVERRIDE_LEN 100
453 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
456 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
457 acpi_string
* new_val
)
459 if (!init_val
|| !new_val
)
460 return AE_BAD_PARAMETER
;
463 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
464 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
466 *new_val
= acpi_os_name
;
473 acpi_os_table_override(struct acpi_table_header
* existing_table
,
474 struct acpi_table_header
** new_table
)
476 if (!existing_table
|| !new_table
)
477 return AE_BAD_PARAMETER
;
481 #ifdef CONFIG_ACPI_CUSTOM_DSDT
482 if (strncmp(existing_table
->signature
, "DSDT", 4) == 0)
483 *new_table
= (struct acpi_table_header
*)AmlCode
;
485 if (*new_table
!= NULL
) {
486 printk(KERN_WARNING PREFIX
"Override [%4.4s-%8.8s], "
487 "this is unsafe: tainting kernel\n",
488 existing_table
->signature
,
489 existing_table
->oem_table_id
);
490 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE
);
495 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
499 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
505 acpi_irq_not_handled
++;
511 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
516 acpi_irq_stats_init();
519 * Ignore the GSI from the core, and use the value in our copy of the
520 * FADT. It may not be the same if an interrupt source override exists
523 gsi
= acpi_gbl_FADT
.sci_interrupt
;
524 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
525 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
530 acpi_irq_handler
= handler
;
531 acpi_irq_context
= context
;
532 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
533 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
534 return AE_NOT_ACQUIRED
;
541 acpi_status
acpi_os_remove_interrupt_handler(u32 irq
, acpi_osd_handler handler
)
544 free_irq(irq
, acpi_irq
);
545 acpi_irq_handler
= NULL
;
553 * Running in interpreter thread context, safe to sleep
556 void acpi_os_sleep(u64 ms
)
558 schedule_timeout_interruptible(msecs_to_jiffies(ms
));
561 void acpi_os_stall(u32 us
)
569 touch_nmi_watchdog();
575 * Support ACPI 3.0 AML Timer operand
576 * Returns 64-bit free-running, monotonically increasing timer
577 * with 100ns granularity
579 u64
acpi_os_get_timer(void)
584 /* TBD: use HPET if available */
587 #ifdef CONFIG_X86_PM_TIMER
588 /* TBD: default to PM timer if HPET was not available */
591 printk(KERN_ERR PREFIX
"acpi_os_get_timer() TBD\n");
596 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
605 *(u8
*) value
= inb(port
);
606 } else if (width
<= 16) {
607 *(u16
*) value
= inw(port
);
608 } else if (width
<= 32) {
609 *(u32
*) value
= inl(port
);
617 EXPORT_SYMBOL(acpi_os_read_port
);
619 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
623 } else if (width
<= 16) {
625 } else if (width
<= 32) {
634 EXPORT_SYMBOL(acpi_os_write_port
);
637 acpi_os_read_memory(acpi_physical_address phys_addr
, u32
* value
, u32 width
)
640 void __iomem
*virt_addr
;
641 int size
= width
/ 8, unmap
= 0;
644 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
647 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
655 *(u8
*) value
= readb(virt_addr
);
658 *(u16
*) value
= readw(virt_addr
);
661 *(u32
*) value
= readl(virt_addr
);
674 acpi_os_write_memory(acpi_physical_address phys_addr
, u32 value
, u32 width
)
676 void __iomem
*virt_addr
;
677 int size
= width
/ 8, unmap
= 0;
680 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
683 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
689 writeb(value
, virt_addr
);
692 writew(value
, virt_addr
);
695 writel(value
, virt_addr
);
708 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
709 u64
*value
, u32 width
)
715 return AE_BAD_PARAMETER
;
731 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
732 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
733 reg
, size
, &value32
);
736 return (result
? AE_ERROR
: AE_OK
);
740 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
741 u64 value
, u32 width
)
759 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
760 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
763 return (result
? AE_ERROR
: AE_OK
);
766 static void acpi_os_execute_deferred(struct work_struct
*work
)
768 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
771 acpi_os_wait_events_complete(NULL
);
773 dpc
->function(dpc
->context
);
777 /*******************************************************************************
779 * FUNCTION: acpi_os_execute
781 * PARAMETERS: Type - Type of the callback
782 * Function - Function to be executed
783 * Context - Function parameters
787 * DESCRIPTION: Depending on type, either queues function for deferred execution or
788 * immediately executes function on a separate thread.
790 ******************************************************************************/
792 static acpi_status
__acpi_os_execute(acpi_execute_type type
,
793 acpi_osd_exec_callback function
, void *context
, int hp
)
795 acpi_status status
= AE_OK
;
796 struct acpi_os_dpc
*dpc
;
797 struct workqueue_struct
*queue
;
799 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
800 "Scheduling function [%p(%p)] for deferred execution.\n",
804 * Allocate/initialize DPC structure. Note that this memory will be
805 * freed by the callee. The kernel handles the work_struct list in a
806 * way that allows us to also free its memory inside the callee.
807 * Because we may want to schedule several tasks with different
808 * parameters we can't use the approach some kernel code uses of
809 * having a static work_struct.
812 dpc
= kmalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
816 dpc
->function
= function
;
817 dpc
->context
= context
;
820 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
821 * because the hotplug code may call driver .remove() functions,
822 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
823 * to flush these workqueues.
825 queue
= hp
? kacpi_hotplug_wq
:
826 (type
== OSL_NOTIFY_HANDLER
? kacpi_notify_wq
: kacpid_wq
);
827 dpc
->wait
= hp
? 1 : 0;
829 if (queue
== kacpi_hotplug_wq
)
830 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
831 else if (queue
== kacpi_notify_wq
)
832 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
834 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
837 * On some machines, a software-initiated SMI causes corruption unless
838 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
839 * typically it's done in GPE-related methods that are run via
840 * workqueues, so we can avoid the known corruption cases by always
843 ret
= queue_work_on(0, queue
, &dpc
->work
);
846 printk(KERN_ERR PREFIX
847 "Call to queue_work() failed.\n");
854 acpi_status
acpi_os_execute(acpi_execute_type type
,
855 acpi_osd_exec_callback function
, void *context
)
857 return __acpi_os_execute(type
, function
, context
, 0);
859 EXPORT_SYMBOL(acpi_os_execute
);
861 acpi_status
acpi_os_hotplug_execute(acpi_osd_exec_callback function
,
864 return __acpi_os_execute(0, function
, context
, 1);
867 void acpi_os_wait_events_complete(void *context
)
869 flush_workqueue(kacpid_wq
);
870 flush_workqueue(kacpi_notify_wq
);
873 EXPORT_SYMBOL(acpi_os_wait_events_complete
);
876 * Deallocate the memory for a spinlock.
878 void acpi_os_delete_lock(acpi_spinlock handle
)
884 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
886 struct semaphore
*sem
= NULL
;
888 sem
= acpi_os_allocate(sizeof(struct semaphore
));
891 memset(sem
, 0, sizeof(struct semaphore
));
893 sema_init(sem
, initial_units
);
895 *handle
= (acpi_handle
*) sem
;
897 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
898 *handle
, initial_units
));
904 * TODO: A better way to delete semaphores? Linux doesn't have a
905 * 'delete_semaphore()' function -- may result in an invalid
906 * pointer dereference for non-synchronized consumers. Should
907 * we at least check for blocked threads and signal/cancel them?
910 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
912 struct semaphore
*sem
= (struct semaphore
*)handle
;
915 return AE_BAD_PARAMETER
;
917 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
919 BUG_ON(!list_empty(&sem
->wait_list
));
927 * TODO: Support for units > 1?
929 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
931 acpi_status status
= AE_OK
;
932 struct semaphore
*sem
= (struct semaphore
*)handle
;
936 if (!sem
|| (units
< 1))
937 return AE_BAD_PARAMETER
;
942 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
943 handle
, units
, timeout
));
945 if (timeout
== ACPI_WAIT_FOREVER
)
946 jiffies
= MAX_SCHEDULE_TIMEOUT
;
948 jiffies
= msecs_to_jiffies(timeout
);
950 ret
= down_timeout(sem
, jiffies
);
954 if (ACPI_FAILURE(status
)) {
955 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
956 "Failed to acquire semaphore[%p|%d|%d], %s",
957 handle
, units
, timeout
,
958 acpi_format_exception(status
)));
960 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
961 "Acquired semaphore[%p|%d|%d]", handle
,
969 * TODO: Support for units > 1?
971 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
973 struct semaphore
*sem
= (struct semaphore
*)handle
;
975 if (!sem
|| (units
< 1))
976 return AE_BAD_PARAMETER
;
981 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
989 #ifdef ACPI_FUTURE_USAGE
990 u32
acpi_os_get_line(char *buffer
)
993 #ifdef ENABLE_DEBUGGER
994 if (acpi_in_debugger
) {
997 kdb_read(buffer
, sizeof(line_buf
));
999 /* remove the CR kdb includes */
1000 chars
= strlen(buffer
) - 1;
1001 buffer
[chars
] = '\0';
1007 #endif /* ACPI_FUTURE_USAGE */
1009 acpi_status
acpi_os_signal(u32 function
, void *info
)
1012 case ACPI_SIGNAL_FATAL
:
1013 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
1015 case ACPI_SIGNAL_BREAKPOINT
:
1018 * ACPI spec. says to treat it as a NOP unless
1019 * you are debugging. So if/when we integrate
1020 * AML debugger into the kernel debugger its
1021 * hook will go here. But until then it is
1022 * not useful to print anything on breakpoints.
1032 static int __init
acpi_os_name_setup(char *str
)
1034 char *p
= acpi_os_name
;
1035 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
1040 for (; count
-- && str
&& *str
; str
++) {
1041 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
1043 else if (*str
== '\'' || *str
== '"')
1054 __setup("acpi_os_name=", acpi_os_name_setup
);
1056 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1057 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1059 struct osi_setup_entry
{
1060 char string
[OSI_STRING_LENGTH_MAX
];
1064 static struct osi_setup_entry __initdata osi_setup_entries
[OSI_STRING_ENTRIES_MAX
];
1066 void __init
acpi_osi_setup(char *str
)
1068 struct osi_setup_entry
*osi
;
1072 if (!acpi_gbl_create_osi_method
)
1075 if (str
== NULL
|| *str
== '\0') {
1076 printk(KERN_INFO PREFIX
"_OSI method disabled\n");
1077 acpi_gbl_create_osi_method
= FALSE
;
1086 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1087 osi
= &osi_setup_entries
[i
];
1088 if (!strcmp(osi
->string
, str
)) {
1089 osi
->enable
= enable
;
1091 } else if (osi
->string
[0] == '\0') {
1092 osi
->enable
= enable
;
1093 strncpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
1099 static void __init
set_osi_linux(unsigned int enable
)
1101 if (osi_linux
.enable
!= enable
)
1102 osi_linux
.enable
= enable
;
1104 if (osi_linux
.enable
)
1105 acpi_osi_setup("Linux");
1107 acpi_osi_setup("!Linux");
1112 static void __init
acpi_cmdline_osi_linux(unsigned int enable
)
1114 osi_linux
.cmdline
= 1; /* cmdline set the default and override DMI */
1116 set_osi_linux(enable
);
1121 void __init
acpi_dmi_osi_linux(int enable
, const struct dmi_system_id
*d
)
1123 printk(KERN_NOTICE PREFIX
"DMI detected: %s\n", d
->ident
);
1128 osi_linux
.dmi
= 1; /* DMI knows that this box asks OSI(Linux) */
1129 set_osi_linux(enable
);
1135 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1137 * empty string disables _OSI
1138 * string starting with '!' disables that string
1139 * otherwise string is added to list, augmenting built-in strings
1141 static void __init
acpi_osi_setup_late(void)
1143 struct osi_setup_entry
*osi
;
1148 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1149 osi
= &osi_setup_entries
[i
];
1155 status
= acpi_install_interface(str
);
1157 if (ACPI_SUCCESS(status
))
1158 printk(KERN_INFO PREFIX
"Added _OSI(%s)\n", str
);
1160 status
= acpi_remove_interface(str
);
1162 if (ACPI_SUCCESS(status
))
1163 printk(KERN_INFO PREFIX
"Deleted _OSI(%s)\n", str
);
1168 static int __init
osi_setup(char *str
)
1170 if (str
&& !strcmp("Linux", str
))
1171 acpi_cmdline_osi_linux(1);
1172 else if (str
&& !strcmp("!Linux", str
))
1173 acpi_cmdline_osi_linux(0);
1175 acpi_osi_setup(str
);
1180 __setup("acpi_osi=", osi_setup
);
1182 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1183 static int __init
acpi_serialize_setup(char *str
)
1185 printk(KERN_INFO PREFIX
"serialize enabled\n");
1187 acpi_gbl_all_methods_serialized
= TRUE
;
1192 __setup("acpi_serialize", acpi_serialize_setup
);
1194 /* Check of resource interference between native drivers and ACPI
1195 * OperationRegions (SystemIO and System Memory only).
1196 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1197 * in arbitrary AML code and can interfere with legacy drivers.
1198 * acpi_enforce_resources= can be set to:
1200 * - strict (default) (2)
1201 * -> further driver trying to access the resources will not load
1203 * -> further driver trying to access the resources will load, but you
1204 * get a system message that something might go wrong...
1207 * -> ACPI Operation Region resources will not be registered
1210 #define ENFORCE_RESOURCES_STRICT 2
1211 #define ENFORCE_RESOURCES_LAX 1
1212 #define ENFORCE_RESOURCES_NO 0
1214 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1216 static int __init
acpi_enforce_resources_setup(char *str
)
1218 if (str
== NULL
|| *str
== '\0')
1221 if (!strcmp("strict", str
))
1222 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1223 else if (!strcmp("lax", str
))
1224 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1225 else if (!strcmp("no", str
))
1226 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1231 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1233 /* Check for resource conflicts between ACPI OperationRegions and native
1235 int acpi_check_resource_conflict(const struct resource
*res
)
1237 struct acpi_res_list
*res_list_elem
;
1238 int ioport
= 0, clash
= 0;
1240 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1242 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1245 ioport
= res
->flags
& IORESOURCE_IO
;
1247 spin_lock(&acpi_res_lock
);
1248 list_for_each_entry(res_list_elem
, &resource_list_head
,
1250 if (ioport
&& (res_list_elem
->resource_type
1251 != ACPI_ADR_SPACE_SYSTEM_IO
))
1253 if (!ioport
&& (res_list_elem
->resource_type
1254 != ACPI_ADR_SPACE_SYSTEM_MEMORY
))
1257 if (res
->end
< res_list_elem
->start
1258 || res_list_elem
->end
< res
->start
)
1263 spin_unlock(&acpi_res_lock
);
1266 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1267 printk(KERN_WARNING
"ACPI: resource %s %pR"
1268 " conflicts with ACPI region %s "
1269 "[%s 0x%zx-0x%zx]\n",
1270 res
->name
, res
, res_list_elem
->name
,
1271 (res_list_elem
->resource_type
==
1272 ACPI_ADR_SPACE_SYSTEM_IO
) ? "io" : "mem",
1273 (size_t) res_list_elem
->start
,
1274 (size_t) res_list_elem
->end
);
1275 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1276 printk(KERN_NOTICE
"ACPI: This conflict may"
1277 " cause random problems and system"
1279 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1280 " for this device, you should use it instead of"
1281 " the native driver\n");
1283 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1288 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1290 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1293 struct resource res
= {
1295 .end
= start
+ n
- 1,
1297 .flags
= IORESOURCE_IO
,
1300 return acpi_check_resource_conflict(&res
);
1302 EXPORT_SYMBOL(acpi_check_region
);
1305 * Let drivers know whether the resource checks are effective
1307 int acpi_resources_are_enforced(void)
1309 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1311 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1314 * Acquire a spinlock.
1316 * handle is a pointer to the spinlock_t.
1319 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1321 acpi_cpu_flags flags
;
1322 spin_lock_irqsave(lockp
, flags
);
1327 * Release a spinlock. See above.
1330 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1332 spin_unlock_irqrestore(lockp
, flags
);
1335 #ifndef ACPI_USE_LOCAL_CACHE
1337 /*******************************************************************************
1339 * FUNCTION: acpi_os_create_cache
1341 * PARAMETERS: name - Ascii name for the cache
1342 * size - Size of each cached object
1343 * depth - Maximum depth of the cache (in objects) <ignored>
1344 * cache - Where the new cache object is returned
1348 * DESCRIPTION: Create a cache object
1350 ******************************************************************************/
1353 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1355 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1362 /*******************************************************************************
1364 * FUNCTION: acpi_os_purge_cache
1366 * PARAMETERS: Cache - Handle to cache object
1370 * DESCRIPTION: Free all objects within the requested cache.
1372 ******************************************************************************/
1374 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1376 kmem_cache_shrink(cache
);
1380 /*******************************************************************************
1382 * FUNCTION: acpi_os_delete_cache
1384 * PARAMETERS: Cache - Handle to cache object
1388 * DESCRIPTION: Free all objects within the requested cache and delete the
1391 ******************************************************************************/
1393 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1395 kmem_cache_destroy(cache
);
1399 /*******************************************************************************
1401 * FUNCTION: acpi_os_release_object
1403 * PARAMETERS: Cache - Handle to cache object
1404 * Object - The object to be released
1408 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1409 * the object is deleted.
1411 ******************************************************************************/
1413 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1415 kmem_cache_free(cache
, object
);
1419 static inline int acpi_res_list_add(struct acpi_res_list
*res
)
1421 struct acpi_res_list
*res_list_elem
;
1423 list_for_each_entry(res_list_elem
, &resource_list_head
,
1426 if (res
->resource_type
== res_list_elem
->resource_type
&&
1427 res
->start
== res_list_elem
->start
&&
1428 res
->end
== res_list_elem
->end
) {
1431 * The Region(addr,len) already exist in the list,
1432 * just increase the count
1435 res_list_elem
->count
++;
1441 list_add(&res
->resource_list
, &resource_list_head
);
1445 static inline void acpi_res_list_del(struct acpi_res_list
*res
)
1447 struct acpi_res_list
*res_list_elem
;
1449 list_for_each_entry(res_list_elem
, &resource_list_head
,
1452 if (res
->resource_type
== res_list_elem
->resource_type
&&
1453 res
->start
== res_list_elem
->start
&&
1454 res
->end
== res_list_elem
->end
) {
1457 * If the res count is decreased to 0,
1458 * remove and free it
1461 if (--res_list_elem
->count
== 0) {
1462 list_del(&res_list_elem
->resource_list
);
1463 kfree(res_list_elem
);
1471 acpi_os_invalidate_address(
1473 acpi_physical_address address
,
1476 struct acpi_res_list res
;
1479 case ACPI_ADR_SPACE_SYSTEM_IO
:
1480 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
1481 /* Only interference checks against SystemIO and SystemMemory
1483 res
.start
= address
;
1484 res
.end
= address
+ length
- 1;
1485 res
.resource_type
= space_id
;
1486 spin_lock(&acpi_res_lock
);
1487 acpi_res_list_del(&res
);
1488 spin_unlock(&acpi_res_lock
);
1490 case ACPI_ADR_SPACE_PCI_CONFIG
:
1491 case ACPI_ADR_SPACE_EC
:
1492 case ACPI_ADR_SPACE_SMBUS
:
1493 case ACPI_ADR_SPACE_CMOS
:
1494 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
1495 case ACPI_ADR_SPACE_DATA_TABLE
:
1496 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
1502 /******************************************************************************
1504 * FUNCTION: acpi_os_validate_address
1506 * PARAMETERS: space_id - ACPI space ID
1507 * address - Physical address
1508 * length - Address length
1510 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1511 * should return AE_AML_ILLEGAL_ADDRESS.
1513 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1514 * the addresses accessed by AML operation regions.
1516 *****************************************************************************/
1519 acpi_os_validate_address (
1521 acpi_physical_address address
,
1525 struct acpi_res_list
*res
;
1527 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1531 case ACPI_ADR_SPACE_SYSTEM_IO
:
1532 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
1533 /* Only interference checks against SystemIO and SystemMemory
1535 res
= kzalloc(sizeof(struct acpi_res_list
), GFP_KERNEL
);
1538 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1539 strlcpy(res
->name
, name
, 5);
1540 res
->start
= address
;
1541 res
->end
= address
+ length
- 1;
1542 res
->resource_type
= space_id
;
1543 spin_lock(&acpi_res_lock
);
1544 added
= acpi_res_list_add(res
);
1545 spin_unlock(&acpi_res_lock
);
1546 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1547 "name: %s\n", added
? "Added" : "Already exist",
1548 (space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
1549 ? "SystemIO" : "System Memory",
1550 (unsigned long long)res
->start
,
1551 (unsigned long long)res
->end
,
1556 case ACPI_ADR_SPACE_PCI_CONFIG
:
1557 case ACPI_ADR_SPACE_EC
:
1558 case ACPI_ADR_SPACE_SMBUS
:
1559 case ACPI_ADR_SPACE_CMOS
:
1560 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
1561 case ACPI_ADR_SPACE_DATA_TABLE
:
1562 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
1569 acpi_status __init
acpi_os_initialize(void)
1571 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1572 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1573 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1574 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1579 acpi_status __init
acpi_os_initialize1(void)
1581 kacpid_wq
= create_workqueue("kacpid");
1582 kacpi_notify_wq
= create_workqueue("kacpi_notify");
1583 kacpi_hotplug_wq
= create_workqueue("kacpi_hotplug");
1585 BUG_ON(!kacpi_notify_wq
);
1586 BUG_ON(!kacpi_hotplug_wq
);
1587 acpi_install_interface_handler(acpi_osi_handler
);
1588 acpi_osi_setup_late();
1592 acpi_status
acpi_os_terminate(void)
1594 if (acpi_irq_handler
) {
1595 acpi_os_remove_interrupt_handler(acpi_irq_irq
,
1599 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1600 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1601 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1602 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1604 destroy_workqueue(kacpid_wq
);
1605 destroy_workqueue(kacpi_notify_wq
);
1606 destroy_workqueue(kacpi_hotplug_wq
);