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 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 struct workqueue_struct
*kacpi_hotplug_wq
;
84 EXPORT_SYMBOL(kacpi_hotplug_wq
);
87 * This list of permanent mappings is for memory that may be accessed from
88 * interrupt context, where we can't do the ioremap().
91 struct list_head list
;
93 acpi_physical_address phys
;
95 unsigned long refcount
;
98 static LIST_HEAD(acpi_ioremaps
);
99 static DEFINE_MUTEX(acpi_ioremap_lock
);
101 static void __init
acpi_osi_setup_late(void);
104 * The story of _OSI(Linux)
106 * From pre-history through Linux-2.6.22,
107 * Linux responded TRUE upon a BIOS OSI(Linux) query.
109 * Unfortunately, reference BIOS writers got wind of this
110 * and put OSI(Linux) in their example code, quickly exposing
111 * this string as ill-conceived and opening the door to
112 * an un-bounded number of BIOS incompatibilities.
114 * For example, OSI(Linux) was used on resume to re-POST a
115 * video card on one system, because Linux at that time
116 * could not do a speedy restore in its native driver.
117 * But then upon gaining quick native restore capability,
118 * Linux has no way to tell the BIOS to skip the time-consuming
119 * POST -- putting Linux at a permanent performance disadvantage.
120 * On another system, the BIOS writer used OSI(Linux)
121 * to infer native OS support for IPMI! On other systems,
122 * OSI(Linux) simply got in the way of Linux claiming to
123 * be compatible with other operating systems, exposing
124 * BIOS issues such as skipped device initialization.
126 * So "Linux" turned out to be a really poor chose of
127 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
129 * BIOS writers should NOT query _OSI(Linux) on future systems.
130 * Linux will complain on the console when it sees it, and return FALSE.
131 * To get Linux to return TRUE for your system will require
132 * a kernel source update to add a DMI entry,
133 * or boot with "acpi_osi=Linux"
136 static struct osi_linux
{
137 unsigned int enable
:1;
139 unsigned int cmdline
:1;
140 } osi_linux
= {0, 0, 0};
142 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
144 if (!strcmp("Linux", interface
)) {
146 printk_once(KERN_NOTICE FW_BUG PREFIX
147 "BIOS _OSI(Linux) query %s%s\n",
148 osi_linux
.enable
? "honored" : "ignored",
149 osi_linux
.cmdline
? " via cmdline" :
150 osi_linux
.dmi
? " via DMI" : "");
156 static void __init
acpi_request_region (struct acpi_generic_address
*addr
,
157 unsigned int length
, char *desc
)
159 if (!addr
->address
|| !length
)
162 /* Resources are never freed */
163 if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
164 request_region(addr
->address
, length
, desc
);
165 else if (addr
->space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
)
166 request_mem_region(addr
->address
, length
, desc
);
169 static int __init
acpi_reserve_resources(void)
171 acpi_request_region(&acpi_gbl_FADT
.xpm1a_event_block
, acpi_gbl_FADT
.pm1_event_length
,
172 "ACPI PM1a_EVT_BLK");
174 acpi_request_region(&acpi_gbl_FADT
.xpm1b_event_block
, acpi_gbl_FADT
.pm1_event_length
,
175 "ACPI PM1b_EVT_BLK");
177 acpi_request_region(&acpi_gbl_FADT
.xpm1a_control_block
, acpi_gbl_FADT
.pm1_control_length
,
178 "ACPI PM1a_CNT_BLK");
180 acpi_request_region(&acpi_gbl_FADT
.xpm1b_control_block
, acpi_gbl_FADT
.pm1_control_length
,
181 "ACPI PM1b_CNT_BLK");
183 if (acpi_gbl_FADT
.pm_timer_length
== 4)
184 acpi_request_region(&acpi_gbl_FADT
.xpm_timer_block
, 4, "ACPI PM_TMR");
186 acpi_request_region(&acpi_gbl_FADT
.xpm2_control_block
, acpi_gbl_FADT
.pm2_control_length
,
189 /* Length of GPE blocks must be a non-negative multiple of 2 */
191 if (!(acpi_gbl_FADT
.gpe0_block_length
& 0x1))
192 acpi_request_region(&acpi_gbl_FADT
.xgpe0_block
,
193 acpi_gbl_FADT
.gpe0_block_length
, "ACPI GPE0_BLK");
195 if (!(acpi_gbl_FADT
.gpe1_block_length
& 0x1))
196 acpi_request_region(&acpi_gbl_FADT
.xgpe1_block
,
197 acpi_gbl_FADT
.gpe1_block_length
, "ACPI GPE1_BLK");
201 device_initcall(acpi_reserve_resources
);
203 void acpi_os_printf(const char *fmt
, ...)
207 acpi_os_vprintf(fmt
, args
);
211 void acpi_os_vprintf(const char *fmt
, va_list args
)
213 static char buffer
[512];
215 vsprintf(buffer
, fmt
, args
);
217 #ifdef ENABLE_DEBUGGER
218 if (acpi_in_debugger
) {
219 kdb_printf("%s", buffer
);
221 printk(KERN_CONT
"%s", buffer
);
224 printk(KERN_CONT
"%s", buffer
);
229 static unsigned long acpi_rsdp
;
230 static int __init
setup_acpi_rsdp(char *arg
)
232 acpi_rsdp
= simple_strtoul(arg
, NULL
, 16);
235 early_param("acpi_rsdp", setup_acpi_rsdp
);
238 acpi_physical_address __init
acpi_os_get_root_pointer(void)
246 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
248 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
251 printk(KERN_ERR PREFIX
252 "System description tables not found\n");
256 acpi_physical_address pa
= 0;
258 acpi_find_root_pointer(&pa
);
263 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
264 static struct acpi_ioremap
*
265 acpi_map_lookup(acpi_physical_address phys
, acpi_size size
)
267 struct acpi_ioremap
*map
;
269 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
270 if (map
->phys
<= phys
&&
271 phys
+ size
<= map
->phys
+ map
->size
)
277 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
278 static void __iomem
*
279 acpi_map_vaddr_lookup(acpi_physical_address phys
, unsigned int size
)
281 struct acpi_ioremap
*map
;
283 map
= acpi_map_lookup(phys
, size
);
285 return map
->virt
+ (phys
- map
->phys
);
290 void __iomem
*acpi_os_get_iomem(acpi_physical_address phys
, unsigned int size
)
292 struct acpi_ioremap
*map
;
293 void __iomem
*virt
= NULL
;
295 mutex_lock(&acpi_ioremap_lock
);
296 map
= acpi_map_lookup(phys
, size
);
298 virt
= map
->virt
+ (phys
- map
->phys
);
301 mutex_unlock(&acpi_ioremap_lock
);
304 EXPORT_SYMBOL_GPL(acpi_os_get_iomem
);
306 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
307 static struct acpi_ioremap
*
308 acpi_map_lookup_virt(void __iomem
*virt
, acpi_size size
)
310 struct acpi_ioremap
*map
;
312 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
313 if (map
->virt
<= virt
&&
314 virt
+ size
<= map
->virt
+ map
->size
)
320 void __iomem
*__init_refok
321 acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
323 struct acpi_ioremap
*map
;
325 acpi_physical_address pg_off
;
328 if (phys
> ULONG_MAX
) {
329 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
333 if (!acpi_gbl_permanent_mmap
)
334 return __acpi_map_table((unsigned long)phys
, size
);
336 mutex_lock(&acpi_ioremap_lock
);
337 /* Check if there's a suitable mapping already. */
338 map
= acpi_map_lookup(phys
, size
);
344 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
346 mutex_unlock(&acpi_ioremap_lock
);
350 pg_off
= round_down(phys
, PAGE_SIZE
);
351 pg_sz
= round_up(phys
+ size
, PAGE_SIZE
) - pg_off
;
352 virt
= acpi_os_ioremap(pg_off
, pg_sz
);
354 mutex_unlock(&acpi_ioremap_lock
);
359 INIT_LIST_HEAD(&map
->list
);
365 list_add_tail_rcu(&map
->list
, &acpi_ioremaps
);
368 mutex_unlock(&acpi_ioremap_lock
);
369 return map
->virt
+ (phys
- map
->phys
);
371 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
373 static void acpi_os_drop_map_ref(struct acpi_ioremap
*map
)
375 if (!--map
->refcount
)
376 list_del_rcu(&map
->list
);
379 static void acpi_os_map_cleanup(struct acpi_ioremap
*map
)
381 if (!map
->refcount
) {
388 void __ref
acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
390 struct acpi_ioremap
*map
;
392 if (!acpi_gbl_permanent_mmap
) {
393 __acpi_unmap_table(virt
, size
);
397 mutex_lock(&acpi_ioremap_lock
);
398 map
= acpi_map_lookup_virt(virt
, size
);
400 mutex_unlock(&acpi_ioremap_lock
);
401 WARN(true, PREFIX
"%s: bad address %p\n", __func__
, virt
);
404 acpi_os_drop_map_ref(map
);
405 mutex_unlock(&acpi_ioremap_lock
);
407 acpi_os_map_cleanup(map
);
409 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
411 void __init
early_acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
413 if (!acpi_gbl_permanent_mmap
)
414 __acpi_unmap_table(virt
, size
);
417 static int acpi_os_map_generic_address(struct acpi_generic_address
*addr
)
421 if (addr
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
424 if (!addr
->address
|| !addr
->bit_width
)
427 virt
= acpi_os_map_memory(addr
->address
, addr
->bit_width
/ 8);
434 static void acpi_os_unmap_generic_address(struct acpi_generic_address
*addr
)
436 struct acpi_ioremap
*map
;
438 if (addr
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
441 if (!addr
->address
|| !addr
->bit_width
)
444 mutex_lock(&acpi_ioremap_lock
);
445 map
= acpi_map_lookup(addr
->address
, addr
->bit_width
/ 8);
447 mutex_unlock(&acpi_ioremap_lock
);
450 acpi_os_drop_map_ref(map
);
451 mutex_unlock(&acpi_ioremap_lock
);
453 acpi_os_map_cleanup(map
);
456 #ifdef ACPI_FUTURE_USAGE
458 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
461 return AE_BAD_PARAMETER
;
463 *phys
= virt_to_phys(virt
);
469 #define ACPI_MAX_OVERRIDE_LEN 100
471 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
474 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
475 acpi_string
* new_val
)
477 if (!init_val
|| !new_val
)
478 return AE_BAD_PARAMETER
;
481 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
482 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
484 *new_val
= acpi_os_name
;
491 acpi_os_table_override(struct acpi_table_header
* existing_table
,
492 struct acpi_table_header
** new_table
)
494 if (!existing_table
|| !new_table
)
495 return AE_BAD_PARAMETER
;
499 #ifdef CONFIG_ACPI_CUSTOM_DSDT
500 if (strncmp(existing_table
->signature
, "DSDT", 4) == 0)
501 *new_table
= (struct acpi_table_header
*)AmlCode
;
503 if (*new_table
!= NULL
) {
504 printk(KERN_WARNING PREFIX
"Override [%4.4s-%8.8s], "
505 "this is unsafe: tainting kernel\n",
506 existing_table
->signature
,
507 existing_table
->oem_table_id
);
508 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE
);
513 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
517 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
523 acpi_irq_not_handled
++;
529 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
534 acpi_irq_stats_init();
537 * ACPI interrupts different from the SCI in our copy of the FADT are
540 if (gsi
!= acpi_gbl_FADT
.sci_interrupt
)
541 return AE_BAD_PARAMETER
;
543 if (acpi_irq_handler
)
544 return AE_ALREADY_ACQUIRED
;
546 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
547 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
552 acpi_irq_handler
= handler
;
553 acpi_irq_context
= context
;
554 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
555 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
556 acpi_irq_handler
= NULL
;
557 return AE_NOT_ACQUIRED
;
563 acpi_status
acpi_os_remove_interrupt_handler(u32 irq
, acpi_osd_handler handler
)
565 if (irq
!= acpi_gbl_FADT
.sci_interrupt
)
566 return AE_BAD_PARAMETER
;
568 free_irq(irq
, acpi_irq
);
569 acpi_irq_handler
= NULL
;
575 * Running in interpreter thread context, safe to sleep
578 void acpi_os_sleep(u64 ms
)
580 schedule_timeout_interruptible(msecs_to_jiffies(ms
));
583 void acpi_os_stall(u32 us
)
591 touch_nmi_watchdog();
597 * Support ACPI 3.0 AML Timer operand
598 * Returns 64-bit free-running, monotonically increasing timer
599 * with 100ns granularity
601 u64
acpi_os_get_timer(void)
606 /* TBD: use HPET if available */
609 #ifdef CONFIG_X86_PM_TIMER
610 /* TBD: default to PM timer if HPET was not available */
613 printk(KERN_ERR PREFIX
"acpi_os_get_timer() TBD\n");
618 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
627 *(u8
*) value
= inb(port
);
628 } else if (width
<= 16) {
629 *(u16
*) value
= inw(port
);
630 } else if (width
<= 32) {
631 *(u32
*) value
= inl(port
);
639 EXPORT_SYMBOL(acpi_os_read_port
);
641 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
645 } else if (width
<= 16) {
647 } else if (width
<= 32) {
656 EXPORT_SYMBOL(acpi_os_write_port
);
659 acpi_os_read_memory(acpi_physical_address phys_addr
, u32
* value
, u32 width
)
661 void __iomem
*virt_addr
;
662 unsigned int size
= width
/ 8;
667 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
670 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
672 return AE_BAD_ADDRESS
;
681 *(u8
*) value
= readb(virt_addr
);
684 *(u16
*) value
= readw(virt_addr
);
687 *(u32
*) value
= readl(virt_addr
);
702 acpi_os_write_memory(acpi_physical_address phys_addr
, u32 value
, u32 width
)
704 void __iomem
*virt_addr
;
705 unsigned int size
= width
/ 8;
709 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
712 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
714 return AE_BAD_ADDRESS
;
720 writeb(value
, virt_addr
);
723 writew(value
, virt_addr
);
726 writel(value
, virt_addr
);
741 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
742 u64
*value
, u32 width
)
748 return AE_BAD_PARAMETER
;
764 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
765 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
766 reg
, size
, &value32
);
769 return (result
? AE_ERROR
: AE_OK
);
773 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
774 u64 value
, u32 width
)
792 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
793 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
796 return (result
? AE_ERROR
: AE_OK
);
799 static void acpi_os_execute_deferred(struct work_struct
*work
)
801 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
804 acpi_os_wait_events_complete(NULL
);
806 dpc
->function(dpc
->context
);
810 /*******************************************************************************
812 * FUNCTION: acpi_os_execute
814 * PARAMETERS: Type - Type of the callback
815 * Function - Function to be executed
816 * Context - Function parameters
820 * DESCRIPTION: Depending on type, either queues function for deferred execution or
821 * immediately executes function on a separate thread.
823 ******************************************************************************/
825 static acpi_status
__acpi_os_execute(acpi_execute_type type
,
826 acpi_osd_exec_callback function
, void *context
, int hp
)
828 acpi_status status
= AE_OK
;
829 struct acpi_os_dpc
*dpc
;
830 struct workqueue_struct
*queue
;
832 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
833 "Scheduling function [%p(%p)] for deferred execution.\n",
837 * Allocate/initialize DPC structure. Note that this memory will be
838 * freed by the callee. The kernel handles the work_struct list in a
839 * way that allows us to also free its memory inside the callee.
840 * Because we may want to schedule several tasks with different
841 * parameters we can't use the approach some kernel code uses of
842 * having a static work_struct.
845 dpc
= kmalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
849 dpc
->function
= function
;
850 dpc
->context
= context
;
853 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
854 * because the hotplug code may call driver .remove() functions,
855 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
856 * to flush these workqueues.
858 queue
= hp
? kacpi_hotplug_wq
:
859 (type
== OSL_NOTIFY_HANDLER
? kacpi_notify_wq
: kacpid_wq
);
860 dpc
->wait
= hp
? 1 : 0;
862 if (queue
== kacpi_hotplug_wq
)
863 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
864 else if (queue
== kacpi_notify_wq
)
865 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
867 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
870 * On some machines, a software-initiated SMI causes corruption unless
871 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
872 * typically it's done in GPE-related methods that are run via
873 * workqueues, so we can avoid the known corruption cases by always
876 ret
= queue_work_on(0, queue
, &dpc
->work
);
879 printk(KERN_ERR PREFIX
880 "Call to queue_work() failed.\n");
887 acpi_status
acpi_os_execute(acpi_execute_type type
,
888 acpi_osd_exec_callback function
, void *context
)
890 return __acpi_os_execute(type
, function
, context
, 0);
892 EXPORT_SYMBOL(acpi_os_execute
);
894 acpi_status
acpi_os_hotplug_execute(acpi_osd_exec_callback function
,
897 return __acpi_os_execute(0, function
, context
, 1);
900 void acpi_os_wait_events_complete(void *context
)
902 flush_workqueue(kacpid_wq
);
903 flush_workqueue(kacpi_notify_wq
);
906 EXPORT_SYMBOL(acpi_os_wait_events_complete
);
909 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
911 struct semaphore
*sem
= NULL
;
913 sem
= acpi_os_allocate(sizeof(struct semaphore
));
916 memset(sem
, 0, sizeof(struct semaphore
));
918 sema_init(sem
, initial_units
);
920 *handle
= (acpi_handle
*) sem
;
922 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
923 *handle
, initial_units
));
929 * TODO: A better way to delete semaphores? Linux doesn't have a
930 * 'delete_semaphore()' function -- may result in an invalid
931 * pointer dereference for non-synchronized consumers. Should
932 * we at least check for blocked threads and signal/cancel them?
935 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
937 struct semaphore
*sem
= (struct semaphore
*)handle
;
940 return AE_BAD_PARAMETER
;
942 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
944 BUG_ON(!list_empty(&sem
->wait_list
));
952 * TODO: Support for units > 1?
954 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
956 acpi_status status
= AE_OK
;
957 struct semaphore
*sem
= (struct semaphore
*)handle
;
961 if (!sem
|| (units
< 1))
962 return AE_BAD_PARAMETER
;
967 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
968 handle
, units
, timeout
));
970 if (timeout
== ACPI_WAIT_FOREVER
)
971 jiffies
= MAX_SCHEDULE_TIMEOUT
;
973 jiffies
= msecs_to_jiffies(timeout
);
975 ret
= down_timeout(sem
, jiffies
);
979 if (ACPI_FAILURE(status
)) {
980 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
981 "Failed to acquire semaphore[%p|%d|%d], %s",
982 handle
, units
, timeout
,
983 acpi_format_exception(status
)));
985 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
986 "Acquired semaphore[%p|%d|%d]", handle
,
994 * TODO: Support for units > 1?
996 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
998 struct semaphore
*sem
= (struct semaphore
*)handle
;
1000 if (!sem
|| (units
< 1))
1001 return AE_BAD_PARAMETER
;
1006 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
1014 #ifdef ACPI_FUTURE_USAGE
1015 u32
acpi_os_get_line(char *buffer
)
1018 #ifdef ENABLE_DEBUGGER
1019 if (acpi_in_debugger
) {
1022 kdb_read(buffer
, sizeof(line_buf
));
1024 /* remove the CR kdb includes */
1025 chars
= strlen(buffer
) - 1;
1026 buffer
[chars
] = '\0';
1032 #endif /* ACPI_FUTURE_USAGE */
1034 acpi_status
acpi_os_signal(u32 function
, void *info
)
1037 case ACPI_SIGNAL_FATAL
:
1038 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
1040 case ACPI_SIGNAL_BREAKPOINT
:
1043 * ACPI spec. says to treat it as a NOP unless
1044 * you are debugging. So if/when we integrate
1045 * AML debugger into the kernel debugger its
1046 * hook will go here. But until then it is
1047 * not useful to print anything on breakpoints.
1057 static int __init
acpi_os_name_setup(char *str
)
1059 char *p
= acpi_os_name
;
1060 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
1065 for (; count
-- && str
&& *str
; str
++) {
1066 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
1068 else if (*str
== '\'' || *str
== '"')
1079 __setup("acpi_os_name=", acpi_os_name_setup
);
1081 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1082 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1084 struct osi_setup_entry
{
1085 char string
[OSI_STRING_LENGTH_MAX
];
1089 static struct osi_setup_entry __initdata
1090 osi_setup_entries
[OSI_STRING_ENTRIES_MAX
] = {
1091 {"Module Device", true},
1092 {"Processor Device", true},
1093 {"3.0 _SCP Extensions", true},
1094 {"Processor Aggregator Device", true},
1097 void __init
acpi_osi_setup(char *str
)
1099 struct osi_setup_entry
*osi
;
1103 if (!acpi_gbl_create_osi_method
)
1106 if (str
== NULL
|| *str
== '\0') {
1107 printk(KERN_INFO PREFIX
"_OSI method disabled\n");
1108 acpi_gbl_create_osi_method
= FALSE
;
1117 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1118 osi
= &osi_setup_entries
[i
];
1119 if (!strcmp(osi
->string
, str
)) {
1120 osi
->enable
= enable
;
1122 } else if (osi
->string
[0] == '\0') {
1123 osi
->enable
= enable
;
1124 strncpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
1130 static void __init
set_osi_linux(unsigned int enable
)
1132 if (osi_linux
.enable
!= enable
)
1133 osi_linux
.enable
= enable
;
1135 if (osi_linux
.enable
)
1136 acpi_osi_setup("Linux");
1138 acpi_osi_setup("!Linux");
1143 static void __init
acpi_cmdline_osi_linux(unsigned int enable
)
1145 osi_linux
.cmdline
= 1; /* cmdline set the default and override DMI */
1147 set_osi_linux(enable
);
1152 void __init
acpi_dmi_osi_linux(int enable
, const struct dmi_system_id
*d
)
1154 printk(KERN_NOTICE PREFIX
"DMI detected: %s\n", d
->ident
);
1159 osi_linux
.dmi
= 1; /* DMI knows that this box asks OSI(Linux) */
1160 set_osi_linux(enable
);
1166 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1168 * empty string disables _OSI
1169 * string starting with '!' disables that string
1170 * otherwise string is added to list, augmenting built-in strings
1172 static void __init
acpi_osi_setup_late(void)
1174 struct osi_setup_entry
*osi
;
1179 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1180 osi
= &osi_setup_entries
[i
];
1186 status
= acpi_install_interface(str
);
1188 if (ACPI_SUCCESS(status
))
1189 printk(KERN_INFO PREFIX
"Added _OSI(%s)\n", str
);
1191 status
= acpi_remove_interface(str
);
1193 if (ACPI_SUCCESS(status
))
1194 printk(KERN_INFO PREFIX
"Deleted _OSI(%s)\n", str
);
1199 static int __init
osi_setup(char *str
)
1201 if (str
&& !strcmp("Linux", str
))
1202 acpi_cmdline_osi_linux(1);
1203 else if (str
&& !strcmp("!Linux", str
))
1204 acpi_cmdline_osi_linux(0);
1206 acpi_osi_setup(str
);
1211 __setup("acpi_osi=", osi_setup
);
1213 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1214 static int __init
acpi_serialize_setup(char *str
)
1216 printk(KERN_INFO PREFIX
"serialize enabled\n");
1218 acpi_gbl_all_methods_serialized
= TRUE
;
1223 __setup("acpi_serialize", acpi_serialize_setup
);
1225 /* Check of resource interference between native drivers and ACPI
1226 * OperationRegions (SystemIO and System Memory only).
1227 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1228 * in arbitrary AML code and can interfere with legacy drivers.
1229 * acpi_enforce_resources= can be set to:
1231 * - strict (default) (2)
1232 * -> further driver trying to access the resources will not load
1234 * -> further driver trying to access the resources will load, but you
1235 * get a system message that something might go wrong...
1238 * -> ACPI Operation Region resources will not be registered
1241 #define ENFORCE_RESOURCES_STRICT 2
1242 #define ENFORCE_RESOURCES_LAX 1
1243 #define ENFORCE_RESOURCES_NO 0
1245 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1247 static int __init
acpi_enforce_resources_setup(char *str
)
1249 if (str
== NULL
|| *str
== '\0')
1252 if (!strcmp("strict", str
))
1253 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1254 else if (!strcmp("lax", str
))
1255 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1256 else if (!strcmp("no", str
))
1257 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1262 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1264 /* Check for resource conflicts between ACPI OperationRegions and native
1266 int acpi_check_resource_conflict(const struct resource
*res
)
1268 acpi_adr_space_type space_id
;
1273 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1275 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1278 if (res
->flags
& IORESOURCE_IO
)
1279 space_id
= ACPI_ADR_SPACE_SYSTEM_IO
;
1281 space_id
= ACPI_ADR_SPACE_SYSTEM_MEMORY
;
1283 length
= res
->end
- res
->start
+ 1;
1284 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
)
1286 clash
= acpi_check_address_range(space_id
, res
->start
, length
, warn
);
1289 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1290 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1291 printk(KERN_NOTICE
"ACPI: This conflict may"
1292 " cause random problems and system"
1294 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1295 " for this device, you should use it instead of"
1296 " the native driver\n");
1298 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1303 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1305 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1308 struct resource res
= {
1310 .end
= start
+ n
- 1,
1312 .flags
= IORESOURCE_IO
,
1315 return acpi_check_resource_conflict(&res
);
1317 EXPORT_SYMBOL(acpi_check_region
);
1320 * Let drivers know whether the resource checks are effective
1322 int acpi_resources_are_enforced(void)
1324 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1326 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1329 * Deallocate the memory for a spinlock.
1331 void acpi_os_delete_lock(acpi_spinlock handle
)
1337 * Acquire a spinlock.
1339 * handle is a pointer to the spinlock_t.
1342 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1344 acpi_cpu_flags flags
;
1345 spin_lock_irqsave(lockp
, flags
);
1350 * Release a spinlock. See above.
1353 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1355 spin_unlock_irqrestore(lockp
, flags
);
1358 #ifndef ACPI_USE_LOCAL_CACHE
1360 /*******************************************************************************
1362 * FUNCTION: acpi_os_create_cache
1364 * PARAMETERS: name - Ascii name for the cache
1365 * size - Size of each cached object
1366 * depth - Maximum depth of the cache (in objects) <ignored>
1367 * cache - Where the new cache object is returned
1371 * DESCRIPTION: Create a cache object
1373 ******************************************************************************/
1376 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1378 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1385 /*******************************************************************************
1387 * FUNCTION: acpi_os_purge_cache
1389 * PARAMETERS: Cache - Handle to cache object
1393 * DESCRIPTION: Free all objects within the requested cache.
1395 ******************************************************************************/
1397 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1399 kmem_cache_shrink(cache
);
1403 /*******************************************************************************
1405 * FUNCTION: acpi_os_delete_cache
1407 * PARAMETERS: Cache - Handle to cache object
1411 * DESCRIPTION: Free all objects within the requested cache and delete the
1414 ******************************************************************************/
1416 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1418 kmem_cache_destroy(cache
);
1422 /*******************************************************************************
1424 * FUNCTION: acpi_os_release_object
1426 * PARAMETERS: Cache - Handle to cache object
1427 * Object - The object to be released
1431 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1432 * the object is deleted.
1434 ******************************************************************************/
1436 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1438 kmem_cache_free(cache
, object
);
1443 acpi_status __init
acpi_os_initialize(void)
1445 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1446 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1447 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1448 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1453 acpi_status __init
acpi_os_initialize1(void)
1455 kacpid_wq
= alloc_workqueue("kacpid", 0, 1);
1456 kacpi_notify_wq
= alloc_workqueue("kacpi_notify", 0, 1);
1457 kacpi_hotplug_wq
= alloc_workqueue("kacpi_hotplug", 0, 1);
1459 BUG_ON(!kacpi_notify_wq
);
1460 BUG_ON(!kacpi_hotplug_wq
);
1461 acpi_install_interface_handler(acpi_osi_handler
);
1462 acpi_osi_setup_late();
1466 acpi_status
acpi_os_terminate(void)
1468 if (acpi_irq_handler
) {
1469 acpi_os_remove_interrupt_handler(acpi_gbl_FADT
.sci_interrupt
,
1473 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1474 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1475 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1476 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1478 destroy_workqueue(kacpid_wq
);
1479 destroy_workqueue(kacpi_notify_wq
);
1480 destroy_workqueue(kacpi_hotplug_wq
);