2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
4 * Copyright (C) 2000 Andrew Henroid
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (c) 2008 Intel Corporation
8 * Author: Matthew Wilcox <willy@linux.intel.com>
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/acpi_io.h>
43 #include <linux/efi.h>
44 #include <linux/ioport.h>
45 #include <linux/list.h>
46 #include <linux/jiffies.h>
47 #include <linux/semaphore.h>
50 #include <asm/uaccess.h>
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
56 #define _COMPONENT ACPI_OS_SERVICES
57 ACPI_MODULE_NAME("osl");
58 #define PREFIX "ACPI: "
60 acpi_osd_exec_callback function
;
62 struct work_struct work
;
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
73 /* stuff for debugger support */
75 EXPORT_SYMBOL(acpi_in_debugger
);
77 extern char line_buf
[80];
78 #endif /*ENABLE_DEBUGGER */
80 static int (*__acpi_os_prepare_sleep
)(u8 sleep_state
, u32 pm1a_ctrl
,
83 static acpi_osd_handler acpi_irq_handler
;
84 static void *acpi_irq_context
;
85 static struct workqueue_struct
*kacpid_wq
;
86 static struct workqueue_struct
*kacpi_notify_wq
;
87 struct workqueue_struct
*kacpi_hotplug_wq
;
88 EXPORT_SYMBOL(kacpi_hotplug_wq
);
91 * This list of permanent mappings is for memory that may be accessed from
92 * interrupt context, where we can't do the ioremap().
95 struct list_head list
;
97 acpi_physical_address phys
;
99 unsigned long refcount
;
102 static LIST_HEAD(acpi_ioremaps
);
103 static DEFINE_MUTEX(acpi_ioremap_lock
);
105 static void __init
acpi_osi_setup_late(void);
108 * The story of _OSI(Linux)
110 * From pre-history through Linux-2.6.22,
111 * Linux responded TRUE upon a BIOS OSI(Linux) query.
113 * Unfortunately, reference BIOS writers got wind of this
114 * and put OSI(Linux) in their example code, quickly exposing
115 * this string as ill-conceived and opening the door to
116 * an un-bounded number of BIOS incompatibilities.
118 * For example, OSI(Linux) was used on resume to re-POST a
119 * video card on one system, because Linux at that time
120 * could not do a speedy restore in its native driver.
121 * But then upon gaining quick native restore capability,
122 * Linux has no way to tell the BIOS to skip the time-consuming
123 * POST -- putting Linux at a permanent performance disadvantage.
124 * On another system, the BIOS writer used OSI(Linux)
125 * to infer native OS support for IPMI! On other systems,
126 * OSI(Linux) simply got in the way of Linux claiming to
127 * be compatible with other operating systems, exposing
128 * BIOS issues such as skipped device initialization.
130 * So "Linux" turned out to be a really poor chose of
131 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
133 * BIOS writers should NOT query _OSI(Linux) on future systems.
134 * Linux will complain on the console when it sees it, and return FALSE.
135 * To get Linux to return TRUE for your system will require
136 * a kernel source update to add a DMI entry,
137 * or boot with "acpi_osi=Linux"
140 static struct osi_linux
{
141 unsigned int enable
:1;
143 unsigned int cmdline
:1;
144 } osi_linux
= {0, 0, 0};
146 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
148 if (!strcmp("Linux", interface
)) {
150 printk_once(KERN_NOTICE FW_BUG PREFIX
151 "BIOS _OSI(Linux) query %s%s\n",
152 osi_linux
.enable
? "honored" : "ignored",
153 osi_linux
.cmdline
? " via cmdline" :
154 osi_linux
.dmi
? " via DMI" : "");
160 static void __init
acpi_request_region (struct acpi_generic_address
*gas
,
161 unsigned int length
, char *desc
)
165 /* Handle possible alignment issues */
166 memcpy(&addr
, &gas
->address
, sizeof(addr
));
167 if (!addr
|| !length
)
170 /* Resources are never freed */
171 if (gas
->space_id
== ACPI_ADR_SPACE_SYSTEM_IO
)
172 request_region(addr
, length
, desc
);
173 else if (gas
->space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
)
174 request_mem_region(addr
, length
, desc
);
177 static int __init
acpi_reserve_resources(void)
179 acpi_request_region(&acpi_gbl_FADT
.xpm1a_event_block
, acpi_gbl_FADT
.pm1_event_length
,
180 "ACPI PM1a_EVT_BLK");
182 acpi_request_region(&acpi_gbl_FADT
.xpm1b_event_block
, acpi_gbl_FADT
.pm1_event_length
,
183 "ACPI PM1b_EVT_BLK");
185 acpi_request_region(&acpi_gbl_FADT
.xpm1a_control_block
, acpi_gbl_FADT
.pm1_control_length
,
186 "ACPI PM1a_CNT_BLK");
188 acpi_request_region(&acpi_gbl_FADT
.xpm1b_control_block
, acpi_gbl_FADT
.pm1_control_length
,
189 "ACPI PM1b_CNT_BLK");
191 if (acpi_gbl_FADT
.pm_timer_length
== 4)
192 acpi_request_region(&acpi_gbl_FADT
.xpm_timer_block
, 4, "ACPI PM_TMR");
194 acpi_request_region(&acpi_gbl_FADT
.xpm2_control_block
, acpi_gbl_FADT
.pm2_control_length
,
197 /* Length of GPE blocks must be a non-negative multiple of 2 */
199 if (!(acpi_gbl_FADT
.gpe0_block_length
& 0x1))
200 acpi_request_region(&acpi_gbl_FADT
.xgpe0_block
,
201 acpi_gbl_FADT
.gpe0_block_length
, "ACPI GPE0_BLK");
203 if (!(acpi_gbl_FADT
.gpe1_block_length
& 0x1))
204 acpi_request_region(&acpi_gbl_FADT
.xgpe1_block
,
205 acpi_gbl_FADT
.gpe1_block_length
, "ACPI GPE1_BLK");
209 device_initcall(acpi_reserve_resources
);
211 void acpi_os_printf(const char *fmt
, ...)
215 acpi_os_vprintf(fmt
, args
);
219 void acpi_os_vprintf(const char *fmt
, va_list args
)
221 static char buffer
[512];
223 vsprintf(buffer
, fmt
, args
);
225 #ifdef ENABLE_DEBUGGER
226 if (acpi_in_debugger
) {
227 kdb_printf("%s", buffer
);
229 printk(KERN_CONT
"%s", buffer
);
232 printk(KERN_CONT
"%s", buffer
);
237 static unsigned long acpi_rsdp
;
238 static int __init
setup_acpi_rsdp(char *arg
)
240 acpi_rsdp
= simple_strtoul(arg
, NULL
, 16);
243 early_param("acpi_rsdp", setup_acpi_rsdp
);
246 acpi_physical_address __init
acpi_os_get_root_pointer(void)
254 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
256 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
259 printk(KERN_ERR PREFIX
260 "System description tables not found\n");
264 acpi_physical_address pa
= 0;
266 acpi_find_root_pointer(&pa
);
271 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272 static struct acpi_ioremap
*
273 acpi_map_lookup(acpi_physical_address phys
, acpi_size size
)
275 struct acpi_ioremap
*map
;
277 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
278 if (map
->phys
<= phys
&&
279 phys
+ size
<= map
->phys
+ map
->size
)
285 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286 static void __iomem
*
287 acpi_map_vaddr_lookup(acpi_physical_address phys
, unsigned int size
)
289 struct acpi_ioremap
*map
;
291 map
= acpi_map_lookup(phys
, size
);
293 return map
->virt
+ (phys
- map
->phys
);
298 void __iomem
*acpi_os_get_iomem(acpi_physical_address phys
, unsigned int size
)
300 struct acpi_ioremap
*map
;
301 void __iomem
*virt
= NULL
;
303 mutex_lock(&acpi_ioremap_lock
);
304 map
= acpi_map_lookup(phys
, size
);
306 virt
= map
->virt
+ (phys
- map
->phys
);
309 mutex_unlock(&acpi_ioremap_lock
);
312 EXPORT_SYMBOL_GPL(acpi_os_get_iomem
);
314 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315 static struct acpi_ioremap
*
316 acpi_map_lookup_virt(void __iomem
*virt
, acpi_size size
)
318 struct acpi_ioremap
*map
;
320 list_for_each_entry_rcu(map
, &acpi_ioremaps
, list
)
321 if (map
->virt
<= virt
&&
322 virt
+ size
<= map
->virt
+ map
->size
)
329 #define should_use_kmap(pfn) page_is_ram(pfn)
331 /* ioremap will take care of cache attributes */
332 #define should_use_kmap(pfn) 0
335 static void __iomem
*acpi_map(acpi_physical_address pg_off
, unsigned long pg_sz
)
339 pfn
= pg_off
>> PAGE_SHIFT
;
340 if (should_use_kmap(pfn
)) {
341 if (pg_sz
> PAGE_SIZE
)
343 return (void __iomem __force
*)kmap(pfn_to_page(pfn
));
345 return acpi_os_ioremap(pg_off
, pg_sz
);
348 static void acpi_unmap(acpi_physical_address pg_off
, void __iomem
*vaddr
)
352 pfn
= pg_off
>> PAGE_SHIFT
;
353 if (should_use_kmap(pfn
))
354 kunmap(pfn_to_page(pfn
));
359 void __iomem
*__init_refok
360 acpi_os_map_memory(acpi_physical_address phys
, acpi_size size
)
362 struct acpi_ioremap
*map
;
364 acpi_physical_address pg_off
;
367 if (phys
> ULONG_MAX
) {
368 printk(KERN_ERR PREFIX
"Cannot map memory that high\n");
372 if (!acpi_gbl_permanent_mmap
)
373 return __acpi_map_table((unsigned long)phys
, size
);
375 mutex_lock(&acpi_ioremap_lock
);
376 /* Check if there's a suitable mapping already. */
377 map
= acpi_map_lookup(phys
, size
);
383 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
385 mutex_unlock(&acpi_ioremap_lock
);
389 pg_off
= round_down(phys
, PAGE_SIZE
);
390 pg_sz
= round_up(phys
+ size
, PAGE_SIZE
) - pg_off
;
391 virt
= acpi_map(pg_off
, pg_sz
);
393 mutex_unlock(&acpi_ioremap_lock
);
398 INIT_LIST_HEAD(&map
->list
);
404 list_add_tail_rcu(&map
->list
, &acpi_ioremaps
);
407 mutex_unlock(&acpi_ioremap_lock
);
408 return map
->virt
+ (phys
- map
->phys
);
410 EXPORT_SYMBOL_GPL(acpi_os_map_memory
);
412 static void acpi_os_drop_map_ref(struct acpi_ioremap
*map
)
414 if (!--map
->refcount
)
415 list_del_rcu(&map
->list
);
418 static void acpi_os_map_cleanup(struct acpi_ioremap
*map
)
420 if (!map
->refcount
) {
422 acpi_unmap(map
->phys
, map
->virt
);
427 void __ref
acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
429 struct acpi_ioremap
*map
;
431 if (!acpi_gbl_permanent_mmap
) {
432 __acpi_unmap_table(virt
, size
);
436 mutex_lock(&acpi_ioremap_lock
);
437 map
= acpi_map_lookup_virt(virt
, size
);
439 mutex_unlock(&acpi_ioremap_lock
);
440 WARN(true, PREFIX
"%s: bad address %p\n", __func__
, virt
);
443 acpi_os_drop_map_ref(map
);
444 mutex_unlock(&acpi_ioremap_lock
);
446 acpi_os_map_cleanup(map
);
448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory
);
450 void __init
early_acpi_os_unmap_memory(void __iomem
*virt
, acpi_size size
)
452 if (!acpi_gbl_permanent_mmap
)
453 __acpi_unmap_table(virt
, size
);
456 int acpi_os_map_generic_address(struct acpi_generic_address
*gas
)
461 if (gas
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
464 /* Handle possible alignment issues */
465 memcpy(&addr
, &gas
->address
, sizeof(addr
));
466 if (!addr
|| !gas
->bit_width
)
469 virt
= acpi_os_map_memory(addr
, gas
->bit_width
/ 8);
475 EXPORT_SYMBOL(acpi_os_map_generic_address
);
477 void acpi_os_unmap_generic_address(struct acpi_generic_address
*gas
)
480 struct acpi_ioremap
*map
;
482 if (gas
->space_id
!= ACPI_ADR_SPACE_SYSTEM_MEMORY
)
485 /* Handle possible alignment issues */
486 memcpy(&addr
, &gas
->address
, sizeof(addr
));
487 if (!addr
|| !gas
->bit_width
)
490 mutex_lock(&acpi_ioremap_lock
);
491 map
= acpi_map_lookup(addr
, gas
->bit_width
/ 8);
493 mutex_unlock(&acpi_ioremap_lock
);
496 acpi_os_drop_map_ref(map
);
497 mutex_unlock(&acpi_ioremap_lock
);
499 acpi_os_map_cleanup(map
);
501 EXPORT_SYMBOL(acpi_os_unmap_generic_address
);
503 #ifdef ACPI_FUTURE_USAGE
505 acpi_os_get_physical_address(void *virt
, acpi_physical_address
* phys
)
508 return AE_BAD_PARAMETER
;
510 *phys
= virt_to_phys(virt
);
516 #define ACPI_MAX_OVERRIDE_LEN 100
518 static char acpi_os_name
[ACPI_MAX_OVERRIDE_LEN
];
521 acpi_os_predefined_override(const struct acpi_predefined_names
*init_val
,
522 acpi_string
* new_val
)
524 if (!init_val
|| !new_val
)
525 return AE_BAD_PARAMETER
;
528 if (!memcmp(init_val
->name
, "_OS_", 4) && strlen(acpi_os_name
)) {
529 printk(KERN_INFO PREFIX
"Overriding _OS definition to '%s'\n",
531 *new_val
= acpi_os_name
;
537 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
538 #include <linux/earlycpio.h>
539 #include <linux/memblock.h>
541 static u64 acpi_tables_addr
;
542 static int all_tables_size
;
544 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
545 u8 __init
acpi_table_checksum(u8
*buffer
, u32 length
)
548 u8
*end
= buffer
+ length
;
551 sum
= (u8
) (sum
+ *(buffer
++));
555 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
556 static const char * const table_sigs
[] = {
557 ACPI_SIG_BERT
, ACPI_SIG_CPEP
, ACPI_SIG_ECDT
, ACPI_SIG_EINJ
,
558 ACPI_SIG_ERST
, ACPI_SIG_HEST
, ACPI_SIG_MADT
, ACPI_SIG_MSCT
,
559 ACPI_SIG_SBST
, ACPI_SIG_SLIT
, ACPI_SIG_SRAT
, ACPI_SIG_ASF
,
560 ACPI_SIG_BOOT
, ACPI_SIG_DBGP
, ACPI_SIG_DMAR
, ACPI_SIG_HPET
,
561 ACPI_SIG_IBFT
, ACPI_SIG_IVRS
, ACPI_SIG_MCFG
, ACPI_SIG_MCHI
,
562 ACPI_SIG_SLIC
, ACPI_SIG_SPCR
, ACPI_SIG_SPMI
, ACPI_SIG_TCPA
,
563 ACPI_SIG_UEFI
, ACPI_SIG_WAET
, ACPI_SIG_WDAT
, ACPI_SIG_WDDT
,
564 ACPI_SIG_WDRT
, ACPI_SIG_DSDT
, ACPI_SIG_FADT
, ACPI_SIG_PSDT
,
565 ACPI_SIG_RSDT
, ACPI_SIG_XSDT
, ACPI_SIG_SSDT
, NULL
};
567 /* Non-fatal errors: Affected tables/files are ignored */
568 #define INVALID_TABLE(x, path, name) \
569 { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
571 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
573 /* Must not increase 10 or needs code modification below */
574 #define ACPI_OVERRIDE_TABLES 10
576 void __init
acpi_initrd_override(void *data
, size_t size
)
578 int sig
, no
, table_nr
= 0, total_offset
= 0;
580 struct acpi_table_header
*table
;
581 char cpio_path
[32] = "kernel/firmware/acpi/";
582 struct cpio_data file
;
583 struct cpio_data early_initrd_files
[ACPI_OVERRIDE_TABLES
];
586 if (data
== NULL
|| size
== 0)
589 for (no
= 0; no
< ACPI_OVERRIDE_TABLES
; no
++) {
590 file
= find_cpio_data(cpio_path
, data
, size
, &offset
);
597 if (file
.size
< sizeof(struct acpi_table_header
))
598 INVALID_TABLE("Table smaller than ACPI header",
599 cpio_path
, file
.name
);
603 for (sig
= 0; table_sigs
[sig
]; sig
++)
604 if (!memcmp(table
->signature
, table_sigs
[sig
], 4))
607 if (!table_sigs
[sig
])
608 INVALID_TABLE("Unknown signature",
609 cpio_path
, file
.name
);
610 if (file
.size
!= table
->length
)
611 INVALID_TABLE("File length does not match table length",
612 cpio_path
, file
.name
);
613 if (acpi_table_checksum(file
.data
, table
->length
))
614 INVALID_TABLE("Bad table checksum",
615 cpio_path
, file
.name
);
617 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
618 table
->signature
, cpio_path
, file
.name
, table
->length
);
620 all_tables_size
+= table
->length
;
621 early_initrd_files
[table_nr
].data
= file
.data
;
622 early_initrd_files
[table_nr
].size
= file
.size
;
629 memblock_find_in_range(0, max_low_pfn_mapped
<< PAGE_SHIFT
,
630 all_tables_size
, PAGE_SIZE
);
631 if (!acpi_tables_addr
) {
636 * Only calling e820_add_reserve does not work and the
637 * tables are invalid (memory got used) later.
638 * memblock_reserve works as expected and the tables won't get modified.
639 * But it's not enough on X86 because ioremap will
640 * complain later (used by acpi_os_map_memory) that the pages
641 * that should get mapped are not marked "reserved".
642 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
645 memblock_reserve(acpi_tables_addr
, acpi_tables_addr
+ all_tables_size
);
646 arch_reserve_mem_area(acpi_tables_addr
, all_tables_size
);
648 p
= early_ioremap(acpi_tables_addr
, all_tables_size
);
650 for (no
= 0; no
< table_nr
; no
++) {
651 memcpy(p
+ total_offset
, early_initrd_files
[no
].data
,
652 early_initrd_files
[no
].size
);
653 total_offset
+= early_initrd_files
[no
].size
;
655 early_iounmap(p
, all_tables_size
);
657 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
659 static void acpi_table_taint(struct acpi_table_header
*table
)
662 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
663 table
->signature
, table
->oem_table_id
);
664 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE
);
669 acpi_os_table_override(struct acpi_table_header
* existing_table
,
670 struct acpi_table_header
** new_table
)
672 if (!existing_table
|| !new_table
)
673 return AE_BAD_PARAMETER
;
677 #ifdef CONFIG_ACPI_CUSTOM_DSDT
678 if (strncmp(existing_table
->signature
, "DSDT", 4) == 0)
679 *new_table
= (struct acpi_table_header
*)AmlCode
;
681 if (*new_table
!= NULL
)
682 acpi_table_taint(existing_table
);
687 acpi_os_physical_table_override(struct acpi_table_header
*existing_table
,
688 acpi_physical_address
*address
,
691 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
696 int table_offset
= 0;
697 struct acpi_table_header
*table
;
702 if (!acpi_tables_addr
)
706 if (table_offset
+ ACPI_HEADER_SIZE
> all_tables_size
) {
711 table
= acpi_os_map_memory(acpi_tables_addr
+ table_offset
,
714 if (table_offset
+ table
->length
> all_tables_size
) {
715 acpi_os_unmap_memory(table
, ACPI_HEADER_SIZE
);
720 table_offset
+= table
->length
;
722 if (memcmp(existing_table
->signature
, table
->signature
, 4)) {
723 acpi_os_unmap_memory(table
,
728 /* Only override tables with matching oem id */
729 if (memcmp(table
->oem_table_id
, existing_table
->oem_table_id
,
730 ACPI_OEM_TABLE_ID_SIZE
)) {
731 acpi_os_unmap_memory(table
,
736 table_offset
-= table
->length
;
737 *table_length
= table
->length
;
738 acpi_os_unmap_memory(table
, ACPI_HEADER_SIZE
);
739 *address
= acpi_tables_addr
+ table_offset
;
741 } while (table_offset
+ ACPI_HEADER_SIZE
< all_tables_size
);
744 acpi_table_taint(existing_table
);
749 static irqreturn_t
acpi_irq(int irq
, void *dev_id
)
753 handled
= (*acpi_irq_handler
) (acpi_irq_context
);
759 acpi_irq_not_handled
++;
765 acpi_os_install_interrupt_handler(u32 gsi
, acpi_osd_handler handler
,
770 acpi_irq_stats_init();
773 * ACPI interrupts different from the SCI in our copy of the FADT are
776 if (gsi
!= acpi_gbl_FADT
.sci_interrupt
)
777 return AE_BAD_PARAMETER
;
779 if (acpi_irq_handler
)
780 return AE_ALREADY_ACQUIRED
;
782 if (acpi_gsi_to_irq(gsi
, &irq
) < 0) {
783 printk(KERN_ERR PREFIX
"SCI (ACPI GSI %d) not registered\n",
788 acpi_irq_handler
= handler
;
789 acpi_irq_context
= context
;
790 if (request_irq(irq
, acpi_irq
, IRQF_SHARED
, "acpi", acpi_irq
)) {
791 printk(KERN_ERR PREFIX
"SCI (IRQ%d) allocation failed\n", irq
);
792 acpi_irq_handler
= NULL
;
793 return AE_NOT_ACQUIRED
;
799 acpi_status
acpi_os_remove_interrupt_handler(u32 irq
, acpi_osd_handler handler
)
801 if (irq
!= acpi_gbl_FADT
.sci_interrupt
)
802 return AE_BAD_PARAMETER
;
804 free_irq(irq
, acpi_irq
);
805 acpi_irq_handler
= NULL
;
811 * Running in interpreter thread context, safe to sleep
814 void acpi_os_sleep(u64 ms
)
816 schedule_timeout_interruptible(msecs_to_jiffies(ms
));
819 void acpi_os_stall(u32 us
)
827 touch_nmi_watchdog();
833 * Support ACPI 3.0 AML Timer operand
834 * Returns 64-bit free-running, monotonically increasing timer
835 * with 100ns granularity
837 u64
acpi_os_get_timer(void)
842 /* TBD: use HPET if available */
845 #ifdef CONFIG_X86_PM_TIMER
846 /* TBD: default to PM timer if HPET was not available */
849 printk(KERN_ERR PREFIX
"acpi_os_get_timer() TBD\n");
854 acpi_status
acpi_os_read_port(acpi_io_address port
, u32
* value
, u32 width
)
863 *(u8
*) value
= inb(port
);
864 } else if (width
<= 16) {
865 *(u16
*) value
= inw(port
);
866 } else if (width
<= 32) {
867 *(u32
*) value
= inl(port
);
875 EXPORT_SYMBOL(acpi_os_read_port
);
877 acpi_status
acpi_os_write_port(acpi_io_address port
, u32 value
, u32 width
)
881 } else if (width
<= 16) {
883 } else if (width
<= 32) {
892 EXPORT_SYMBOL(acpi_os_write_port
);
895 static inline u64
read64(const volatile void __iomem
*addr
)
900 static inline u64
read64(const volatile void __iomem
*addr
)
905 return l
| (h
<< 32);
910 acpi_os_read_memory(acpi_physical_address phys_addr
, u64
*value
, u32 width
)
912 void __iomem
*virt_addr
;
913 unsigned int size
= width
/ 8;
918 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
921 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
923 return AE_BAD_ADDRESS
;
932 *(u8
*) value
= readb(virt_addr
);
935 *(u16
*) value
= readw(virt_addr
);
938 *(u32
*) value
= readl(virt_addr
);
941 *(u64
*) value
= read64(virt_addr
);
956 static inline void write64(u64 val
, volatile void __iomem
*addr
)
961 static inline void write64(u64 val
, volatile void __iomem
*addr
)
964 writel(val
>>32, addr
+4);
969 acpi_os_write_memory(acpi_physical_address phys_addr
, u64 value
, u32 width
)
971 void __iomem
*virt_addr
;
972 unsigned int size
= width
/ 8;
976 virt_addr
= acpi_map_vaddr_lookup(phys_addr
, size
);
979 virt_addr
= acpi_os_ioremap(phys_addr
, size
);
981 return AE_BAD_ADDRESS
;
987 writeb(value
, virt_addr
);
990 writew(value
, virt_addr
);
993 writel(value
, virt_addr
);
996 write64(value
, virt_addr
);
1011 acpi_os_read_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
1012 u64
*value
, u32 width
)
1018 return AE_BAD_PARAMETER
;
1034 result
= raw_pci_read(pci_id
->segment
, pci_id
->bus
,
1035 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
1036 reg
, size
, &value32
);
1039 return (result
? AE_ERROR
: AE_OK
);
1043 acpi_os_write_pci_configuration(struct acpi_pci_id
* pci_id
, u32 reg
,
1044 u64 value
, u32 width
)
1062 result
= raw_pci_write(pci_id
->segment
, pci_id
->bus
,
1063 PCI_DEVFN(pci_id
->device
, pci_id
->function
),
1066 return (result
? AE_ERROR
: AE_OK
);
1069 static void acpi_os_execute_deferred(struct work_struct
*work
)
1071 struct acpi_os_dpc
*dpc
= container_of(work
, struct acpi_os_dpc
, work
);
1074 acpi_os_wait_events_complete();
1076 dpc
->function(dpc
->context
);
1080 /*******************************************************************************
1082 * FUNCTION: acpi_os_execute
1084 * PARAMETERS: Type - Type of the callback
1085 * Function - Function to be executed
1086 * Context - Function parameters
1090 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1091 * immediately executes function on a separate thread.
1093 ******************************************************************************/
1095 static acpi_status
__acpi_os_execute(acpi_execute_type type
,
1096 acpi_osd_exec_callback function
, void *context
, int hp
)
1098 acpi_status status
= AE_OK
;
1099 struct acpi_os_dpc
*dpc
;
1100 struct workqueue_struct
*queue
;
1102 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
1103 "Scheduling function [%p(%p)] for deferred execution.\n",
1104 function
, context
));
1107 * Allocate/initialize DPC structure. Note that this memory will be
1108 * freed by the callee. The kernel handles the work_struct list in a
1109 * way that allows us to also free its memory inside the callee.
1110 * Because we may want to schedule several tasks with different
1111 * parameters we can't use the approach some kernel code uses of
1112 * having a static work_struct.
1115 dpc
= kzalloc(sizeof(struct acpi_os_dpc
), GFP_ATOMIC
);
1117 return AE_NO_MEMORY
;
1119 dpc
->function
= function
;
1120 dpc
->context
= context
;
1123 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1124 * because the hotplug code may call driver .remove() functions,
1125 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1126 * to flush these workqueues.
1128 * To prevent lockdep from complaining unnecessarily, make sure that
1129 * there is a different static lockdep key for each workqueue by using
1130 * INIT_WORK() for each of them separately.
1133 queue
= kacpi_hotplug_wq
;
1135 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1136 } else if (type
== OSL_NOTIFY_HANDLER
) {
1137 queue
= kacpi_notify_wq
;
1138 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1141 INIT_WORK(&dpc
->work
, acpi_os_execute_deferred
);
1145 * On some machines, a software-initiated SMI causes corruption unless
1146 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1147 * typically it's done in GPE-related methods that are run via
1148 * workqueues, so we can avoid the known corruption cases by always
1149 * queueing on CPU 0.
1151 ret
= queue_work_on(0, queue
, &dpc
->work
);
1154 printk(KERN_ERR PREFIX
1155 "Call to queue_work() failed.\n");
1162 acpi_status
acpi_os_execute(acpi_execute_type type
,
1163 acpi_osd_exec_callback function
, void *context
)
1165 return __acpi_os_execute(type
, function
, context
, 0);
1167 EXPORT_SYMBOL(acpi_os_execute
);
1169 acpi_status
acpi_os_hotplug_execute(acpi_osd_exec_callback function
,
1172 return __acpi_os_execute(0, function
, context
, 1);
1174 EXPORT_SYMBOL(acpi_os_hotplug_execute
);
1176 void acpi_os_wait_events_complete(void)
1178 flush_workqueue(kacpid_wq
);
1179 flush_workqueue(kacpi_notify_wq
);
1182 EXPORT_SYMBOL(acpi_os_wait_events_complete
);
1185 acpi_os_create_semaphore(u32 max_units
, u32 initial_units
, acpi_handle
* handle
)
1187 struct semaphore
*sem
= NULL
;
1189 sem
= acpi_os_allocate(sizeof(struct semaphore
));
1191 return AE_NO_MEMORY
;
1192 memset(sem
, 0, sizeof(struct semaphore
));
1194 sema_init(sem
, initial_units
);
1196 *handle
= (acpi_handle
*) sem
;
1198 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Creating semaphore[%p|%d].\n",
1199 *handle
, initial_units
));
1205 * TODO: A better way to delete semaphores? Linux doesn't have a
1206 * 'delete_semaphore()' function -- may result in an invalid
1207 * pointer dereference for non-synchronized consumers. Should
1208 * we at least check for blocked threads and signal/cancel them?
1211 acpi_status
acpi_os_delete_semaphore(acpi_handle handle
)
1213 struct semaphore
*sem
= (struct semaphore
*)handle
;
1216 return AE_BAD_PARAMETER
;
1218 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Deleting semaphore[%p].\n", handle
));
1220 BUG_ON(!list_empty(&sem
->wait_list
));
1228 * TODO: Support for units > 1?
1230 acpi_status
acpi_os_wait_semaphore(acpi_handle handle
, u32 units
, u16 timeout
)
1232 acpi_status status
= AE_OK
;
1233 struct semaphore
*sem
= (struct semaphore
*)handle
;
1237 if (!sem
|| (units
< 1))
1238 return AE_BAD_PARAMETER
;
1243 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Waiting for semaphore[%p|%d|%d]\n",
1244 handle
, units
, timeout
));
1246 if (timeout
== ACPI_WAIT_FOREVER
)
1247 jiffies
= MAX_SCHEDULE_TIMEOUT
;
1249 jiffies
= msecs_to_jiffies(timeout
);
1251 ret
= down_timeout(sem
, jiffies
);
1255 if (ACPI_FAILURE(status
)) {
1256 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
1257 "Failed to acquire semaphore[%p|%d|%d], %s",
1258 handle
, units
, timeout
,
1259 acpi_format_exception(status
)));
1261 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
1262 "Acquired semaphore[%p|%d|%d]", handle
,
1270 * TODO: Support for units > 1?
1272 acpi_status
acpi_os_signal_semaphore(acpi_handle handle
, u32 units
)
1274 struct semaphore
*sem
= (struct semaphore
*)handle
;
1276 if (!sem
|| (units
< 1))
1277 return AE_BAD_PARAMETER
;
1282 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Signaling semaphore[%p|%d]\n", handle
,
1290 #ifdef ACPI_FUTURE_USAGE
1291 u32
acpi_os_get_line(char *buffer
)
1294 #ifdef ENABLE_DEBUGGER
1295 if (acpi_in_debugger
) {
1298 kdb_read(buffer
, sizeof(line_buf
));
1300 /* remove the CR kdb includes */
1301 chars
= strlen(buffer
) - 1;
1302 buffer
[chars
] = '\0';
1308 #endif /* ACPI_FUTURE_USAGE */
1310 acpi_status
acpi_os_signal(u32 function
, void *info
)
1313 case ACPI_SIGNAL_FATAL
:
1314 printk(KERN_ERR PREFIX
"Fatal opcode executed\n");
1316 case ACPI_SIGNAL_BREAKPOINT
:
1319 * ACPI spec. says to treat it as a NOP unless
1320 * you are debugging. So if/when we integrate
1321 * AML debugger into the kernel debugger its
1322 * hook will go here. But until then it is
1323 * not useful to print anything on breakpoints.
1333 static int __init
acpi_os_name_setup(char *str
)
1335 char *p
= acpi_os_name
;
1336 int count
= ACPI_MAX_OVERRIDE_LEN
- 1;
1341 for (; count
-- && str
&& *str
; str
++) {
1342 if (isalnum(*str
) || *str
== ' ' || *str
== ':')
1344 else if (*str
== '\'' || *str
== '"')
1355 __setup("acpi_os_name=", acpi_os_name_setup
);
1357 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1358 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1360 struct osi_setup_entry
{
1361 char string
[OSI_STRING_LENGTH_MAX
];
1365 static struct osi_setup_entry __initdata
1366 osi_setup_entries
[OSI_STRING_ENTRIES_MAX
] = {
1367 {"Module Device", true},
1368 {"Processor Device", true},
1369 {"3.0 _SCP Extensions", true},
1370 {"Processor Aggregator Device", true},
1373 void __init
acpi_osi_setup(char *str
)
1375 struct osi_setup_entry
*osi
;
1379 if (!acpi_gbl_create_osi_method
)
1382 if (str
== NULL
|| *str
== '\0') {
1383 printk(KERN_INFO PREFIX
"_OSI method disabled\n");
1384 acpi_gbl_create_osi_method
= FALSE
;
1393 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1394 osi
= &osi_setup_entries
[i
];
1395 if (!strcmp(osi
->string
, str
)) {
1396 osi
->enable
= enable
;
1398 } else if (osi
->string
[0] == '\0') {
1399 osi
->enable
= enable
;
1400 strncpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
1406 static void __init
set_osi_linux(unsigned int enable
)
1408 if (osi_linux
.enable
!= enable
)
1409 osi_linux
.enable
= enable
;
1411 if (osi_linux
.enable
)
1412 acpi_osi_setup("Linux");
1414 acpi_osi_setup("!Linux");
1419 static void __init
acpi_cmdline_osi_linux(unsigned int enable
)
1421 osi_linux
.cmdline
= 1; /* cmdline set the default and override DMI */
1423 set_osi_linux(enable
);
1428 void __init
acpi_dmi_osi_linux(int enable
, const struct dmi_system_id
*d
)
1430 printk(KERN_NOTICE PREFIX
"DMI detected: %s\n", d
->ident
);
1435 osi_linux
.dmi
= 1; /* DMI knows that this box asks OSI(Linux) */
1436 set_osi_linux(enable
);
1442 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1444 * empty string disables _OSI
1445 * string starting with '!' disables that string
1446 * otherwise string is added to list, augmenting built-in strings
1448 static void __init
acpi_osi_setup_late(void)
1450 struct osi_setup_entry
*osi
;
1455 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
1456 osi
= &osi_setup_entries
[i
];
1462 status
= acpi_install_interface(str
);
1464 if (ACPI_SUCCESS(status
))
1465 printk(KERN_INFO PREFIX
"Added _OSI(%s)\n", str
);
1467 status
= acpi_remove_interface(str
);
1469 if (ACPI_SUCCESS(status
))
1470 printk(KERN_INFO PREFIX
"Deleted _OSI(%s)\n", str
);
1475 static int __init
osi_setup(char *str
)
1477 if (str
&& !strcmp("Linux", str
))
1478 acpi_cmdline_osi_linux(1);
1479 else if (str
&& !strcmp("!Linux", str
))
1480 acpi_cmdline_osi_linux(0);
1482 acpi_osi_setup(str
);
1487 __setup("acpi_osi=", osi_setup
);
1489 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1490 static int __init
acpi_serialize_setup(char *str
)
1492 printk(KERN_INFO PREFIX
"serialize enabled\n");
1494 acpi_gbl_all_methods_serialized
= TRUE
;
1499 __setup("acpi_serialize", acpi_serialize_setup
);
1501 /* Check of resource interference between native drivers and ACPI
1502 * OperationRegions (SystemIO and System Memory only).
1503 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1504 * in arbitrary AML code and can interfere with legacy drivers.
1505 * acpi_enforce_resources= can be set to:
1507 * - strict (default) (2)
1508 * -> further driver trying to access the resources will not load
1510 * -> further driver trying to access the resources will load, but you
1511 * get a system message that something might go wrong...
1514 * -> ACPI Operation Region resources will not be registered
1517 #define ENFORCE_RESOURCES_STRICT 2
1518 #define ENFORCE_RESOURCES_LAX 1
1519 #define ENFORCE_RESOURCES_NO 0
1521 static unsigned int acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1523 static int __init
acpi_enforce_resources_setup(char *str
)
1525 if (str
== NULL
|| *str
== '\0')
1528 if (!strcmp("strict", str
))
1529 acpi_enforce_resources
= ENFORCE_RESOURCES_STRICT
;
1530 else if (!strcmp("lax", str
))
1531 acpi_enforce_resources
= ENFORCE_RESOURCES_LAX
;
1532 else if (!strcmp("no", str
))
1533 acpi_enforce_resources
= ENFORCE_RESOURCES_NO
;
1538 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup
);
1540 /* Check for resource conflicts between ACPI OperationRegions and native
1542 int acpi_check_resource_conflict(const struct resource
*res
)
1544 acpi_adr_space_type space_id
;
1549 if (acpi_enforce_resources
== ENFORCE_RESOURCES_NO
)
1551 if (!(res
->flags
& IORESOURCE_IO
) && !(res
->flags
& IORESOURCE_MEM
))
1554 if (res
->flags
& IORESOURCE_IO
)
1555 space_id
= ACPI_ADR_SPACE_SYSTEM_IO
;
1557 space_id
= ACPI_ADR_SPACE_SYSTEM_MEMORY
;
1559 length
= res
->end
- res
->start
+ 1;
1560 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
)
1562 clash
= acpi_check_address_range(space_id
, res
->start
, length
, warn
);
1565 if (acpi_enforce_resources
!= ENFORCE_RESOURCES_NO
) {
1566 if (acpi_enforce_resources
== ENFORCE_RESOURCES_LAX
)
1567 printk(KERN_NOTICE
"ACPI: This conflict may"
1568 " cause random problems and system"
1570 printk(KERN_INFO
"ACPI: If an ACPI driver is available"
1571 " for this device, you should use it instead of"
1572 " the native driver\n");
1574 if (acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
)
1579 EXPORT_SYMBOL(acpi_check_resource_conflict
);
1581 int acpi_check_region(resource_size_t start
, resource_size_t n
,
1584 struct resource res
= {
1586 .end
= start
+ n
- 1,
1588 .flags
= IORESOURCE_IO
,
1591 return acpi_check_resource_conflict(&res
);
1593 EXPORT_SYMBOL(acpi_check_region
);
1596 * Let drivers know whether the resource checks are effective
1598 int acpi_resources_are_enforced(void)
1600 return acpi_enforce_resources
== ENFORCE_RESOURCES_STRICT
;
1602 EXPORT_SYMBOL(acpi_resources_are_enforced
);
1605 * Deallocate the memory for a spinlock.
1607 void acpi_os_delete_lock(acpi_spinlock handle
)
1613 * Acquire a spinlock.
1615 * handle is a pointer to the spinlock_t.
1618 acpi_cpu_flags
acpi_os_acquire_lock(acpi_spinlock lockp
)
1620 acpi_cpu_flags flags
;
1621 spin_lock_irqsave(lockp
, flags
);
1626 * Release a spinlock. See above.
1629 void acpi_os_release_lock(acpi_spinlock lockp
, acpi_cpu_flags flags
)
1631 spin_unlock_irqrestore(lockp
, flags
);
1634 #ifndef ACPI_USE_LOCAL_CACHE
1636 /*******************************************************************************
1638 * FUNCTION: acpi_os_create_cache
1640 * PARAMETERS: name - Ascii name for the cache
1641 * size - Size of each cached object
1642 * depth - Maximum depth of the cache (in objects) <ignored>
1643 * cache - Where the new cache object is returned
1647 * DESCRIPTION: Create a cache object
1649 ******************************************************************************/
1652 acpi_os_create_cache(char *name
, u16 size
, u16 depth
, acpi_cache_t
** cache
)
1654 *cache
= kmem_cache_create(name
, size
, 0, 0, NULL
);
1661 /*******************************************************************************
1663 * FUNCTION: acpi_os_purge_cache
1665 * PARAMETERS: Cache - Handle to cache object
1669 * DESCRIPTION: Free all objects within the requested cache.
1671 ******************************************************************************/
1673 acpi_status
acpi_os_purge_cache(acpi_cache_t
* cache
)
1675 kmem_cache_shrink(cache
);
1679 /*******************************************************************************
1681 * FUNCTION: acpi_os_delete_cache
1683 * PARAMETERS: Cache - Handle to cache object
1687 * DESCRIPTION: Free all objects within the requested cache and delete the
1690 ******************************************************************************/
1692 acpi_status
acpi_os_delete_cache(acpi_cache_t
* cache
)
1694 kmem_cache_destroy(cache
);
1698 /*******************************************************************************
1700 * FUNCTION: acpi_os_release_object
1702 * PARAMETERS: Cache - Handle to cache object
1703 * Object - The object to be released
1707 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1708 * the object is deleted.
1710 ******************************************************************************/
1712 acpi_status
acpi_os_release_object(acpi_cache_t
* cache
, void *object
)
1714 kmem_cache_free(cache
, object
);
1719 acpi_status __init
acpi_os_initialize(void)
1721 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1722 acpi_os_map_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1723 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1724 acpi_os_map_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1729 acpi_status __init
acpi_os_initialize1(void)
1731 kacpid_wq
= alloc_workqueue("kacpid", 0, 1);
1732 kacpi_notify_wq
= alloc_workqueue("kacpi_notify", 0, 1);
1733 kacpi_hotplug_wq
= alloc_workqueue("kacpi_hotplug", 0, 1);
1735 BUG_ON(!kacpi_notify_wq
);
1736 BUG_ON(!kacpi_hotplug_wq
);
1737 acpi_install_interface_handler(acpi_osi_handler
);
1738 acpi_osi_setup_late();
1742 acpi_status
acpi_os_terminate(void)
1744 if (acpi_irq_handler
) {
1745 acpi_os_remove_interrupt_handler(acpi_gbl_FADT
.sci_interrupt
,
1749 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe1_block
);
1750 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xgpe0_block
);
1751 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1b_event_block
);
1752 acpi_os_unmap_generic_address(&acpi_gbl_FADT
.xpm1a_event_block
);
1754 destroy_workqueue(kacpid_wq
);
1755 destroy_workqueue(kacpi_notify_wq
);
1756 destroy_workqueue(kacpi_hotplug_wq
);
1761 acpi_status
acpi_os_prepare_sleep(u8 sleep_state
, u32 pm1a_control
,
1765 if (__acpi_os_prepare_sleep
)
1766 rc
= __acpi_os_prepare_sleep(sleep_state
,
1767 pm1a_control
, pm1b_control
);
1771 return AE_CTRL_SKIP
;
1776 void acpi_os_set_prepare_sleep(int (*func
)(u8 sleep_state
,
1777 u32 pm1a_ctrl
, u32 pm1b_ctrl
))
1779 __acpi_os_prepare_sleep
= func
;