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
);
99 * This list of permanent mappings is for memory that may be accessed from
100 * interrupt context, where we can't do the ioremap().
102 struct acpi_ioremap
{
103 struct list_head list
;
105 acpi_physical_address phys
;
110 static LIST_HEAD(acpi_ioremaps
);
111 static DEFINE_SPINLOCK(acpi_ioremap_lock
);
113 static void __init
acpi_osi_setup_late(void);
116 * The story of _OSI(Linux)
118 * From pre-history through Linux-2.6.22,
119 * Linux responded TRUE upon a BIOS OSI(Linux) query.
121 * Unfortunately, reference BIOS writers got wind of this
122 * and put OSI(Linux) in their example code, quickly exposing
123 * this string as ill-conceived and opening the door to
124 * an un-bounded number of BIOS incompatibilities.
126 * For example, OSI(Linux) was used on resume to re-POST a
127 * video card on one system, because Linux at that time
128 * could not do a speedy restore in its native driver.
129 * But then upon gaining quick native restore capability,
130 * Linux has no way to tell the BIOS to skip the time-consuming
131 * POST -- putting Linux at a permanent performance disadvantage.
132 * On another system, the BIOS writer used OSI(Linux)
133 * to infer native OS support for IPMI! On other systems,
134 * OSI(Linux) simply got in the way of Linux claiming to
135 * be compatible with other operating systems, exposing
136 * BIOS issues such as skipped device initialization.
138 * So "Linux" turned out to be a really poor chose of
139 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
141 * BIOS writers should NOT query _OSI(Linux) on future systems.
142 * Linux will complain on the console when it sees it, and return FALSE.
143 * To get Linux to return TRUE for your system will require
144 * a kernel source update to add a DMI entry,
145 * or boot with "acpi_osi=Linux"
148 static struct osi_linux
{
149 unsigned int enable
:1;
151 unsigned int cmdline
:1;
152 } osi_linux
= {0, 0, 0};
154 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
156 if (!strcmp("Linux", interface
)) {
158 printk(KERN_NOTICE FW_BUG PREFIX
159 "BIOS _OSI(Linux) query %s%s\n",
160 osi_linux
.enable
? "honored" : "ignored",
161 osi_linux
.cmdline
? " via cmdline" :
162 osi_linux
.dmi
? " via DMI" : "");
168 static void __init
acpi_request_region (struct acpi_generic_address
*addr
,
169 unsigned int length
, char *desc
)
171 if (!addr
->address
|| !length
)
174 /* Resources are never freed */
175 if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
176 request_region(addr
->address
, length
, desc
);
177 else if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
)
178 request_mem_region(addr
->address
, length
, desc
);
181 static int __init
acpi_reserve_resources(void)
183 acpi_request_region(&acpi_gbl_FADT
.xpm1a_event_block
, acpi_gbl_FADT
.pm1_event_length
,
184 "ACPI PM1a_EVT_BLK");
186 acpi_request_region(&acpi_gbl_FADT
.xpm1b_event_block
, acpi_gbl_FADT
.pm1_event_length
,
187 "ACPI PM1b_EVT_BLK");
189 acpi_request_region(&acpi_gbl_FADT
.xpm1a_control_block
, acpi_gbl_FADT
.pm1_control_length
,
190 "ACPI PM1a_CNT_BLK");
192 acpi_request_region(&acpi_gbl_FADT
.xpm1b_control_block
, acpi_gbl_FADT
.pm1_control_length
,
193 "ACPI PM1b_CNT_BLK");
195 if (acpi_gbl_FADT
.pm_timer_length
== 4)
196 acpi_request_region(&acpi_gbl_FADT
.xpm_timer_block
, 4, "ACPI PM_TMR");
198 acpi_request_region(&acpi_gbl_FADT
.xpm2_control_block
, acpi_gbl_FADT
.pm2_control_length
,
201 /* Length of GPE blocks must be a non-negative multiple of 2 */
203 if (!(acpi_gbl_FADT
.gpe0_block_length
& 0x1))
204 acpi_request_region(&acpi_gbl_FADT
.xgpe0_block
,
205 acpi_gbl_FADT
.gpe0_block_length
, "ACPI GPE0_BLK");
207 if (!(acpi_gbl_FADT
.gpe1_block_length
& 0x1))
208 acpi_request_region(&acpi_gbl_FADT
.xgpe1_block
,
209 acpi_gbl_FADT
.gpe1_block_length
, "ACPI GPE1_BLK");
213 device_initcall(acpi_reserve_resources
);
215 void acpi_os_printf(const char *fmt
, ...)
219 acpi_os_vprintf(fmt
, args
);
223 void acpi_os_vprintf(const char *fmt
, va_list args
)
225 static char buffer
[512];
227 vsprintf(buffer
, fmt
, args
);
229 #ifdef ENABLE_DEBUGGER
230 if (acpi_in_debugger
) {
231 kdb_printf("%s", buffer
);
233 printk(KERN_CONT
"%s", buffer
);
236 printk(KERN_CONT
"%s", buffer
);
240 acpi_physical_address __init
acpi_os_get_root_pointer(void)
243 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
245 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
248 printk(KERN_ERR PREFIX
249 "System description tables not found\n");
253 acpi_physical_address pa
= 0;
255 acpi_find_root_pointer(&pa
);
260 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
261 static struct acpi_ioremap
*
262 acpi_map_lookup(acpi_physical_address phys
, acpi_size size
)
264 struct acpi_ioremap
*map
;
266 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
267 if (map
->phys
<= phys
&&
268 phys
+ size
<= map
->phys
+ map
->size
)
274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
275 static void __iomem
*
276 acpi_map_vaddr_lookup(acpi_physical_address phys
, unsigned int size
)
278 struct acpi_ioremap
*map
;
280 map
= acpi_map_lookup(phys
, size
);
282 return map
->virt
+ (phys
- map
->phys
);
287 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
288 static struct acpi_ioremap
*
289 acpi_map_lookup_virt(void __iomem
*virt
, acpi_size size
)
291 struct acpi_ioremap
*map
;
293 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
294 if (map
->virt
<= virt
&&
295 virt
+ size
<= map
->virt
+ map
->size
)
301 void __iomem
*__init_refok
302 acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
304 struct acpi_ioremap
*map
, *tmp_map
;
305 unsigned long flags
, pg_sz
;
309 if (phys
> ULONG_MAX
) {
310 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
314 if (!acpi_gbl_permanent_mmap
)
315 return __acpi_map_table((unsigned long)phys
, size
);
317 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
321 pg_off
= round_down(phys
, PAGE_SIZE
);
322 pg_sz
= round_up(phys
+ size
, PAGE_SIZE
) - pg_off
;
323 virt
= ioremap(pg_off
, pg_sz
);
329 INIT_LIST_HEAD(&map
->list
);
333 kref_init(&map
->ref
);
335 spin_lock_irqsave(&acpi_ioremap_lock
, flags
);
336 /* Check if page has already been mapped. */
337 tmp_map
= acpi_map_lookup(phys
, size
);
339 kref_get(&tmp_map
->ref
);
340 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
343 return tmp_map
->virt
+ (phys
- tmp_map
->phys
);
345 list_add_tail_rcu(&map
->list
, &acpi_ioremaps
);
346 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
348 return map
->virt
+ (phys
- map
->phys
);
350 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
352 static void acpi_kref_del_iomap(struct kref
*ref
)
354 struct acpi_ioremap
*map
;
356 map
= container_of(ref
, struct acpi_ioremap
, ref
);
357 list_del_rcu(&map
->list
);
360 void __ref
acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
362 struct acpi_ioremap
*map
;
366 if (!acpi_gbl_permanent_mmap
) {
367 __acpi_unmap_table(virt
, size
);
371 spin_lock_irqsave(&acpi_ioremap_lock
, flags
);
372 map
= acpi_map_lookup_virt(virt
, size
);
374 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
375 printk(KERN_ERR PREFIX
"%s: bad address %p\n", __func__
, virt
);
380 del
= kref_put(&map
->ref
, acpi_kref_del_iomap
);
381 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
390 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
392 void __init
early_acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
394 if (!acpi_gbl_permanent_mmap
)
395 __acpi_unmap_table(virt
, size
);
398 int acpi_os_map_generic_address(struct acpi_generic_address
*addr
)
402 if (addr
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
405 if (!addr
->address
|| !addr
->bit_width
)
408 virt
= acpi_os_map_memory(addr
->address
, addr
->bit_width
/ 8);
414 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address
);
416 void acpi_os_unmap_generic_address(struct acpi_generic_address
*addr
)
420 acpi_size size
= addr
->bit_width
/ 8;
422 if (addr
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
425 if (!addr
->address
|| !addr
->bit_width
)
428 spin_lock_irqsave(&acpi_ioremap_lock
, flags
);
429 virt
= acpi_map_vaddr_lookup(addr
->address
, size
);
430 spin_unlock_irqrestore(&acpi_ioremap_lock
, flags
);
432 acpi_os_unmap_memory(virt
, size
);
434 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address
);
436 #ifdef ACPI_FUTURE_USAGE
438 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
441 return AE_BAD_PARAMETER
;
443 *phys
= virt_to_phys(virt
);
449 #define ACPI_MAX_OVERRIDE_LEN 100
451 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
454 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
455 acpi_string
* new_val
)
457 if (!init_val
|| !new_val
)
458 return AE_BAD_PARAMETER
;
461 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
462 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
464 *new_val
= acpi_os_name
;
471 acpi_os_table_override(struct acpi_table_header
* existing_table
,
472 struct acpi_table_header
** new_table
)
474 if (!existing_table
|| !new_table
)
475 return AE_BAD_PARAMETER
;
479 #ifdef CONFIG_ACPI_CUSTOM_DSDT
480 if (strncmp(existing_table
->signature
, "DSDT", 4) == 0)
481 *new_table
= (struct acpi_table_header
*)AmlCode
;
483 if (*new_table
!= NULL
) {
484 printk(KERN_WARNING PREFIX
"Override [%4.4s-%8.8s], "
485 "this is unsafe: tainting kernel\n",
486 existing_table
->signature
,
487 existing_table
->oem_table_id
);
488 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE
);
493 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
497 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
503 acpi_irq_not_handled
++;
509 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
514 acpi_irq_stats_init();
517 * Ignore the GSI from the core, and use the value in our copy of the
518 * FADT. It may not be the same if an interrupt source override exists
521 gsi
= acpi_gbl_FADT
.sci_interrupt
;
522 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
523 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
528 acpi_irq_handler
= handler
;
529 acpi_irq_context
= context
;
530 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
531 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
532 return AE_NOT_ACQUIRED
;
539 acpi_status
acpi_os_remove_interrupt_handler(u32 irq
, acpi_osd_handler handler
)
542 free_irq(irq
, acpi_irq
);
543 acpi_irq_handler
= NULL
;
551 * Running in interpreter thread context, safe to sleep
554 void acpi_os_sleep(u64 ms
)
556 schedule_timeout_interruptible(msecs_to_jiffies(ms
));
559 void acpi_os_stall(u32 us
)
567 touch_nmi_watchdog();
573 * Support ACPI 3.0 AML Timer operand
574 * Returns 64-bit free-running, monotonically increasing timer
575 * with 100ns granularity
577 u64
acpi_os_get_timer(void)
582 /* TBD: use HPET if available */
585 #ifdef CONFIG_X86_PM_TIMER
586 /* TBD: default to PM timer if HPET was not available */
589 printk(KERN_ERR PREFIX
"acpi_os_get_timer() TBD\n");
594 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
603 *(u8
*) value
= inb(port
);
604 } else if (width
<= 16) {
605 *(u16
*) value
= inw(port
);
606 } else if (width
<= 32) {
607 *(u32
*) value
= inl(port
);
615 EXPORT_SYMBOL(acpi_os_read_port
);
617 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
621 } else if (width
<= 16) {
623 } else if (width
<= 32) {
632 EXPORT_SYMBOL(acpi_os_write_port
);
635 acpi_os_read_memory(acpi_physical_address phys_addr
, u32
* value
, u32 width
)
638 void __iomem
*virt_addr
;
639 int size
= width
/ 8, unmap
= 0;
642 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
645 virt_addr
= ioremap(phys_addr
, size
);
653 *(u8
*) value
= readb(virt_addr
);
656 *(u16
*) value
= readw(virt_addr
);
659 *(u32
*) value
= readl(virt_addr
);
672 acpi_os_write_memory(acpi_physical_address phys_addr
, u32 value
, u32 width
)
674 void __iomem
*virt_addr
;
675 int size
= width
/ 8, unmap
= 0;
678 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
681 virt_addr
= ioremap(phys_addr
, size
);
687 writeb(value
, virt_addr
);
690 writew(value
, virt_addr
);
693 writel(value
, virt_addr
);
706 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
707 u64
*value
, u32 width
)
713 return AE_BAD_PARAMETER
;
729 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
730 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
731 reg
, size
, &value32
);
734 return (result
? AE_ERROR
: AE_OK
);
738 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
739 u64 value
, u32 width
)
757 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
758 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
761 return (result
? AE_ERROR
: AE_OK
);
764 static void acpi_os_execute_deferred(struct work_struct
*work
)
766 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
769 acpi_os_wait_events_complete(NULL
);
771 dpc
->function(dpc
->context
);
775 /*******************************************************************************
777 * FUNCTION: acpi_os_execute
779 * PARAMETERS: Type - Type of the callback
780 * Function - Function to be executed
781 * Context - Function parameters
785 * DESCRIPTION: Depending on type, either queues function for deferred execution or
786 * immediately executes function on a separate thread.
788 ******************************************************************************/
790 static acpi_status
__acpi_os_execute(acpi_execute_type type
,
791 acpi_osd_exec_callback function
, void *context
, int hp
)
793 acpi_status status
= AE_OK
;
794 struct acpi_os_dpc
*dpc
;
795 struct workqueue_struct
*queue
;
797 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
798 "Scheduling function [%p(%p)] for deferred execution.\n",
802 * Allocate/initialize DPC structure. Note that this memory will be
803 * freed by the callee. The kernel handles the work_struct list in a
804 * way that allows us to also free its memory inside the callee.
805 * Because we may want to schedule several tasks with different
806 * parameters we can't use the approach some kernel code uses of
807 * having a static work_struct.
810 dpc
= kmalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
814 dpc
->function
= function
;
815 dpc
->context
= context
;
818 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
819 * because the hotplug code may call driver .remove() functions,
820 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
821 * to flush these workqueues.
823 queue
= hp
? kacpi_hotplug_wq
:
824 (type
== OSL_NOTIFY_HANDLER
? kacpi_notify_wq
: kacpid_wq
);
825 dpc
->wait
= hp
? 1 : 0;
827 if (queue
== kacpi_hotplug_wq
)
828 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
829 else if (queue
== kacpi_notify_wq
)
830 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
832 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
835 * On some machines, a software-initiated SMI causes corruption unless
836 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
837 * typically it's done in GPE-related methods that are run via
838 * workqueues, so we can avoid the known corruption cases by always
841 ret
= queue_work_on(0, queue
, &dpc
->work
);
844 printk(KERN_ERR PREFIX
845 "Call to queue_work() failed.\n");
852 acpi_status
acpi_os_execute(acpi_execute_type type
,
853 acpi_osd_exec_callback function
, void *context
)
855 return __acpi_os_execute(type
, function
, context
, 0);
857 EXPORT_SYMBOL(acpi_os_execute
);
859 acpi_status
acpi_os_hotplug_execute(acpi_osd_exec_callback function
,
862 return __acpi_os_execute(0, function
, context
, 1);
865 void acpi_os_wait_events_complete(void *context
)
867 flush_workqueue(kacpid_wq
);
868 flush_workqueue(kacpi_notify_wq
);
871 EXPORT_SYMBOL(acpi_os_wait_events_complete
);
874 * Deallocate the memory for a spinlock.
876 void acpi_os_delete_lock(acpi_spinlock handle
)
882 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
884 struct semaphore
*sem
= NULL
;
886 sem
= acpi_os_allocate(sizeof(struct semaphore
));
889 memset(sem
, 0, sizeof(struct semaphore
));
891 sema_init(sem
, initial_units
);
893 *handle
= (acpi_handle
*) sem
;
895 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
896 *handle
, initial_units
));
902 * TODO: A better way to delete semaphores? Linux doesn't have a
903 * 'delete_semaphore()' function -- may result in an invalid
904 * pointer dereference for non-synchronized consumers. Should
905 * we at least check for blocked threads and signal/cancel them?
908 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
910 struct semaphore
*sem
= (struct semaphore
*)handle
;
913 return AE_BAD_PARAMETER
;
915 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
917 BUG_ON(!list_empty(&sem
->wait_list
));
925 * TODO: Support for units > 1?
927 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
929 acpi_status status
= AE_OK
;
930 struct semaphore
*sem
= (struct semaphore
*)handle
;
934 if (!sem
|| (units
< 1))
935 return AE_BAD_PARAMETER
;
940 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
941 handle
, units
, timeout
));
943 if (timeout
== ACPI_WAIT_FOREVER
)
944 jiffies
= MAX_SCHEDULE_TIMEOUT
;
946 jiffies
= msecs_to_jiffies(timeout
);
948 ret
= down_timeout(sem
, jiffies
);
952 if (ACPI_FAILURE(status
)) {
953 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
954 "Failed to acquire semaphore[%p|%d|%d], %s",
955 handle
, units
, timeout
,
956 acpi_format_exception(status
)));
958 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
959 "Acquired semaphore[%p|%d|%d]", handle
,
967 * TODO: Support for units > 1?
969 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
971 struct semaphore
*sem
= (struct semaphore
*)handle
;
973 if (!sem
|| (units
< 1))
974 return AE_BAD_PARAMETER
;
979 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
987 #ifdef ACPI_FUTURE_USAGE
988 u32
acpi_os_get_line(char *buffer
)
991 #ifdef ENABLE_DEBUGGER
992 if (acpi_in_debugger
) {
995 kdb_read(buffer
, sizeof(line_buf
));
997 /* remove the CR kdb includes */
998 chars
= strlen(buffer
) - 1;
999 buffer
[chars
] = '\0';
1005 #endif /* ACPI_FUTURE_USAGE */
1007 acpi_status
acpi_os_signal(u32 function
, void *info
)
1010 case ACPI_SIGNAL_FATAL
:
1011 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
1013 case ACPI_SIGNAL_BREAKPOINT
:
1016 * ACPI spec. says to treat it as a NOP unless
1017 * you are debugging. So if/when we integrate
1018 * AML debugger into the kernel debugger its
1019 * hook will go here. But until then it is
1020 * not useful to print anything on breakpoints.
1030 static int __init
acpi_os_name_setup(char *str
)
1032 char *p
= acpi_os_name
;
1033 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
1038 for (; count
-- && str
&& *str
; str
++) {
1039 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
1041 else if (*str
== '\'' || *str
== '"')
1052 __setup("acpi_os_name=", acpi_os_name_setup
);
1054 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1055 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1057 struct osi_setup_entry
{
1058 char string
[OSI_STRING_LENGTH_MAX
];
1062 static struct osi_setup_entry __initdata osi_setup_entries
[OSI_STRING_ENTRIES_MAX
];
1064 void __init
acpi_osi_setup(char *str
)
1066 struct osi_setup_entry
*osi
;
1070 if (!acpi_gbl_create_osi_method
)
1073 if (str
== NULL
|| *str
== '\0') {
1074 printk(KERN_INFO PREFIX
"_OSI method disabled\n");
1075 acpi_gbl_create_osi_method
= FALSE
;
1084 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1085 osi
= &osi_setup_entries
[i
];
1086 if (!strcmp(osi
->string
, str
)) {
1087 osi
->enable
= enable
;
1089 } else if (osi
->string
[0] == '\0') {
1090 osi
->enable
= enable
;
1091 strncpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
1097 static void __init
set_osi_linux(unsigned int enable
)
1099 if (osi_linux
.enable
!= enable
)
1100 osi_linux
.enable
= enable
;
1102 if (osi_linux
.enable
)
1103 acpi_osi_setup("Linux");
1105 acpi_osi_setup("!Linux");
1110 static void __init
acpi_cmdline_osi_linux(unsigned int enable
)
1112 osi_linux
.cmdline
= 1; /* cmdline set the default and override DMI */
1114 set_osi_linux(enable
);
1119 void __init
acpi_dmi_osi_linux(int enable
, const struct dmi_system_id
*d
)
1121 printk(KERN_NOTICE PREFIX
"DMI detected: %s\n", d
->ident
);
1126 osi_linux
.dmi
= 1; /* DMI knows that this box asks OSI(Linux) */
1127 set_osi_linux(enable
);
1133 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1135 * empty string disables _OSI
1136 * string starting with '!' disables that string
1137 * otherwise string is added to list, augmenting built-in strings
1139 static void __init
acpi_osi_setup_late(void)
1141 struct osi_setup_entry
*osi
;
1146 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1147 osi
= &osi_setup_entries
[i
];
1153 status
= acpi_install_interface(str
);
1155 if (ACPI_SUCCESS(status
))
1156 printk(KERN_INFO PREFIX
"Added _OSI(%s)\n", str
);
1158 status
= acpi_remove_interface(str
);
1160 if (ACPI_SUCCESS(status
))
1161 printk(KERN_INFO PREFIX
"Deleted _OSI(%s)\n", str
);
1166 static int __init
osi_setup(char *str
)
1168 if (str
&& !strcmp("Linux", str
))
1169 acpi_cmdline_osi_linux(1);
1170 else if (str
&& !strcmp("!Linux", str
))
1171 acpi_cmdline_osi_linux(0);
1173 acpi_osi_setup(str
);
1178 __setup("acpi_osi=", osi_setup
);
1180 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1181 static int __init
acpi_serialize_setup(char *str
)
1183 printk(KERN_INFO PREFIX
"serialize enabled\n");
1185 acpi_gbl_all_methods_serialized
= TRUE
;
1190 __setup("acpi_serialize", acpi_serialize_setup
);
1192 /* Check of resource interference between native drivers and ACPI
1193 * OperationRegions (SystemIO and System Memory only).
1194 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1195 * in arbitrary AML code and can interfere with legacy drivers.
1196 * acpi_enforce_resources= can be set to:
1198 * - strict (default) (2)
1199 * -> further driver trying to access the resources will not load
1201 * -> further driver trying to access the resources will load, but you
1202 * get a system message that something might go wrong...
1205 * -> ACPI Operation Region resources will not be registered
1208 #define ENFORCE_RESOURCES_STRICT 2
1209 #define ENFORCE_RESOURCES_LAX 1
1210 #define ENFORCE_RESOURCES_NO 0
1212 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1214 static int __init
acpi_enforce_resources_setup(char *str
)
1216 if (str
== NULL
|| *str
== '\0')
1219 if (!strcmp("strict", str
))
1220 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1221 else if (!strcmp("lax", str
))
1222 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1223 else if (!strcmp("no", str
))
1224 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1229 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1231 /* Check for resource conflicts between ACPI OperationRegions and native
1233 int acpi_check_resource_conflict(const struct resource
*res
)
1235 struct acpi_res_list
*res_list_elem
;
1239 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1241 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1244 ioport
= res
->flags
& IORESOURCE_IO
;
1246 spin_lock(&acpi_res_lock
);
1247 list_for_each_entry(res_list_elem
, &resource_list_head
,
1249 if (ioport
&& (res_list_elem
->resource_type
1250 != ACPI_ADR_SPACE_SYSTEM_IO
))
1252 if (!ioport
&& (res_list_elem
->resource_type
1253 != ACPI_ADR_SPACE_SYSTEM_MEMORY
))
1256 if (res
->end
< res_list_elem
->start
1257 || res_list_elem
->end
< res
->start
)
1262 spin_unlock(&acpi_res_lock
);
1265 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1266 printk(KERN_WARNING
"ACPI: resource %s %pR"
1267 " conflicts with ACPI region %s %pR\n",
1268 res
->name
, res
, res_list_elem
->name
,
1270 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1271 printk(KERN_NOTICE
"ACPI: This conflict may"
1272 " cause random problems and system"
1274 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1275 " for this device, you should use it instead of"
1276 " the native driver\n");
1278 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1283 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1285 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1288 struct resource res
= {
1290 .end
= start
+ n
- 1,
1292 .flags
= IORESOURCE_IO
,
1295 return acpi_check_resource_conflict(&res
);
1297 EXPORT_SYMBOL(acpi_check_region
);
1300 * Let drivers know whether the resource checks are effective
1302 int acpi_resources_are_enforced(void)
1304 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1306 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1309 * Acquire a spinlock.
1311 * handle is a pointer to the spinlock_t.
1314 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1316 acpi_cpu_flags flags
;
1317 spin_lock_irqsave(lockp
, flags
);
1322 * Release a spinlock. See above.
1325 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1327 spin_unlock_irqrestore(lockp
, flags
);
1330 #ifndef ACPI_USE_LOCAL_CACHE
1332 /*******************************************************************************
1334 * FUNCTION: acpi_os_create_cache
1336 * PARAMETERS: name - Ascii name for the cache
1337 * size - Size of each cached object
1338 * depth - Maximum depth of the cache (in objects) <ignored>
1339 * cache - Where the new cache object is returned
1343 * DESCRIPTION: Create a cache object
1345 ******************************************************************************/
1348 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1350 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1357 /*******************************************************************************
1359 * FUNCTION: acpi_os_purge_cache
1361 * PARAMETERS: Cache - Handle to cache object
1365 * DESCRIPTION: Free all objects within the requested cache.
1367 ******************************************************************************/
1369 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1371 kmem_cache_shrink(cache
);
1375 /*******************************************************************************
1377 * FUNCTION: acpi_os_delete_cache
1379 * PARAMETERS: Cache - Handle to cache object
1383 * DESCRIPTION: Free all objects within the requested cache and delete the
1386 ******************************************************************************/
1388 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1390 kmem_cache_destroy(cache
);
1394 /*******************************************************************************
1396 * FUNCTION: acpi_os_release_object
1398 * PARAMETERS: Cache - Handle to cache object
1399 * Object - The object to be released
1403 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1404 * the object is deleted.
1406 ******************************************************************************/
1408 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1410 kmem_cache_free(cache
, object
);
1414 static inline int acpi_res_list_add(struct acpi_res_list
*res
)
1416 struct acpi_res_list
*res_list_elem
;
1418 list_for_each_entry(res_list_elem
, &resource_list_head
,
1421 if (res
->resource_type
== res_list_elem
->resource_type
&&
1422 res
->start
== res_list_elem
->start
&&
1423 res
->end
== res_list_elem
->end
) {
1426 * The Region(addr,len) already exist in the list,
1427 * just increase the count
1430 res_list_elem
->count
++;
1436 list_add(&res
->resource_list
, &resource_list_head
);
1440 static inline void acpi_res_list_del(struct acpi_res_list
*res
)
1442 struct acpi_res_list
*res_list_elem
;
1444 list_for_each_entry(res_list_elem
, &resource_list_head
,
1447 if (res
->resource_type
== res_list_elem
->resource_type
&&
1448 res
->start
== res_list_elem
->start
&&
1449 res
->end
== res_list_elem
->end
) {
1452 * If the res count is decreased to 0,
1453 * remove and free it
1456 if (--res_list_elem
->count
== 0) {
1457 list_del(&res_list_elem
->resource_list
);
1458 kfree(res_list_elem
);
1466 acpi_os_invalidate_address(
1468 acpi_physical_address address
,
1471 struct acpi_res_list res
;
1474 case ACPI_ADR_SPACE_SYSTEM_IO
:
1475 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
1476 /* Only interference checks against SystemIO and SystemMemory
1478 res
.start
= address
;
1479 res
.end
= address
+ length
- 1;
1480 res
.resource_type
= space_id
;
1481 spin_lock(&acpi_res_lock
);
1482 acpi_res_list_del(&res
);
1483 spin_unlock(&acpi_res_lock
);
1485 case ACPI_ADR_SPACE_PCI_CONFIG
:
1486 case ACPI_ADR_SPACE_EC
:
1487 case ACPI_ADR_SPACE_SMBUS
:
1488 case ACPI_ADR_SPACE_CMOS
:
1489 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
1490 case ACPI_ADR_SPACE_DATA_TABLE
:
1491 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
1497 /******************************************************************************
1499 * FUNCTION: acpi_os_validate_address
1501 * PARAMETERS: space_id - ACPI space ID
1502 * address - Physical address
1503 * length - Address length
1505 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1506 * should return AE_AML_ILLEGAL_ADDRESS.
1508 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1509 * the addresses accessed by AML operation regions.
1511 *****************************************************************************/
1514 acpi_os_validate_address (
1516 acpi_physical_address address
,
1520 struct acpi_res_list
*res
;
1522 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1526 case ACPI_ADR_SPACE_SYSTEM_IO
:
1527 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
1528 /* Only interference checks against SystemIO and SystemMemory
1530 res
= kzalloc(sizeof(struct acpi_res_list
), GFP_KERNEL
);
1533 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1534 strlcpy(res
->name
, name
, 5);
1535 res
->start
= address
;
1536 res
->end
= address
+ length
- 1;
1537 res
->resource_type
= space_id
;
1538 spin_lock(&acpi_res_lock
);
1539 added
= acpi_res_list_add(res
);
1540 spin_unlock(&acpi_res_lock
);
1541 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1542 "name: %s\n", added
? "Added" : "Already exist",
1543 (space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
1544 ? "SystemIO" : "System Memory",
1545 (unsigned long long)res
->start
,
1546 (unsigned long long)res
->end
,
1551 case ACPI_ADR_SPACE_PCI_CONFIG
:
1552 case ACPI_ADR_SPACE_EC
:
1553 case ACPI_ADR_SPACE_SMBUS
:
1554 case ACPI_ADR_SPACE_CMOS
:
1555 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
1556 case ACPI_ADR_SPACE_DATA_TABLE
:
1557 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
1564 acpi_status __init
acpi_os_initialize(void)
1566 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1567 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1568 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1569 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1574 acpi_status __init
acpi_os_initialize1(void)
1576 kacpid_wq
= create_workqueue("kacpid");
1577 kacpi_notify_wq
= create_workqueue("kacpi_notify");
1578 kacpi_hotplug_wq
= create_workqueue("kacpi_hotplug");
1580 BUG_ON(!kacpi_notify_wq
);
1581 BUG_ON(!kacpi_hotplug_wq
);
1582 acpi_install_interface_handler(acpi_osi_handler
);
1583 acpi_osi_setup_late();
1587 acpi_status
acpi_os_terminate(void)
1589 if (acpi_irq_handler
) {
1590 acpi_os_remove_interrupt_handler(acpi_irq_irq
,
1594 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1595 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1596 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1597 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1599 destroy_workqueue(kacpid_wq
);
1600 destroy_workqueue(kacpi_notify_wq
);
1601 destroy_workqueue(kacpi_hotplug_wq
);