2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
4 * Copyright (C) 2000 Andrew Henroid
7 * Copyright (c) 2008 Intel Corporation
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
34 #include <linux/pci.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.h>
40 #include <linux/acpi.h>
41 #include <linux/efi.h>
42 #include <linux/ioport.h>
43 #include <linux/list.h>
44 #include <linux/jiffies.h>
45 #include <linux/semaphore.h>
48 #include <asm/uaccess.h>
50 #include <acpi/acpi.h>
51 #include <acpi/acpi_bus.h>
52 #include <acpi/processor.h>
54 #define _COMPONENT ACPI_OS_SERVICES
55 ACPI_MODULE_NAME("osl");
56 #define PREFIX "ACPI: "
58 acpi_osd_exec_callback function;
60 struct work_struct work;
64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
68 #ifdef ENABLE_DEBUGGER
69 #include <linux/kdb.h>
71 /* stuff for debugger support */
73 EXPORT_SYMBOL(acpi_in_debugger);
75 extern char line_buf[80];
76 #endif /*ENABLE_DEBUGGER */
78 static unsigned int acpi_irq_irq;
79 static acpi_osd_handler acpi_irq_handler;
80 static void *acpi_irq_context;
81 static struct workqueue_struct *kacpid_wq;
82 static struct workqueue_struct *kacpi_notify_wq;
83 static struct workqueue_struct *kacpi_hotplug_wq;
85 struct acpi_res_list {
86 resource_size_t start;
88 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
89 char name[5]; /* only can have a length of 4 chars, make use of this
90 one instead of res->name, no need to kalloc then */
91 struct list_head resource_list;
95 static LIST_HEAD(resource_list_head);
96 static DEFINE_SPINLOCK(acpi_res_lock);
98 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
99 static char osi_setup_string[OSI_STRING_LENGTH_MAX];
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 unsigned int known:1;
141 } osi_linux = { 0, 0, 0, 0};
143 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145 if (!strcmp("Linux", interface)) {
147 printk(KERN_NOTICE FW_BUG PREFIX
148 "BIOS _OSI(Linux) query %s%s\n",
149 osi_linux.enable ? "honored" : "ignored",
150 osi_linux.cmdline ? " via cmdline" :
151 osi_linux.dmi ? " via DMI" : "");
157 static void __init acpi_request_region (struct acpi_generic_address *addr,
158 unsigned int length, char *desc)
160 if (!addr->address || !length)
163 /* Resources are never freed */
164 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
165 request_region(addr->address, length, desc);
166 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
167 request_mem_region(addr->address, length, desc);
170 static int __init acpi_reserve_resources(void)
172 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
173 "ACPI PM1a_EVT_BLK");
175 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
176 "ACPI PM1b_EVT_BLK");
178 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
179 "ACPI PM1a_CNT_BLK");
181 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
182 "ACPI PM1b_CNT_BLK");
184 if (acpi_gbl_FADT.pm_timer_length == 4)
185 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
187 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
190 /* Length of GPE blocks must be a non-negative multiple of 2 */
192 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
193 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
194 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
196 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
197 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
198 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
202 device_initcall(acpi_reserve_resources);
204 acpi_status __init acpi_os_initialize(void)
209 acpi_status acpi_os_initialize1(void)
211 kacpid_wq = create_workqueue("kacpid");
212 kacpi_notify_wq = create_workqueue("kacpi_notify");
213 kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
215 BUG_ON(!kacpi_notify_wq);
216 BUG_ON(!kacpi_hotplug_wq);
217 acpi_install_interface_handler(acpi_osi_handler);
218 acpi_osi_setup_late();
222 acpi_status acpi_os_terminate(void)
224 if (acpi_irq_handler) {
225 acpi_os_remove_interrupt_handler(acpi_irq_irq,
229 destroy_workqueue(kacpid_wq);
230 destroy_workqueue(kacpi_notify_wq);
231 destroy_workqueue(kacpi_hotplug_wq);
236 void acpi_os_printf(const char *fmt, ...)
240 acpi_os_vprintf(fmt, args);
244 void acpi_os_vprintf(const char *fmt, va_list args)
246 static char buffer[512];
248 vsprintf(buffer, fmt, args);
250 #ifdef ENABLE_DEBUGGER
251 if (acpi_in_debugger) {
252 kdb_printf("%s", buffer);
254 printk(KERN_CONT "%s", buffer);
257 printk(KERN_CONT "%s", buffer);
261 acpi_physical_address __init acpi_os_get_root_pointer(void)
264 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
266 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
269 printk(KERN_ERR PREFIX
270 "System description tables not found\n");
274 acpi_physical_address pa = 0;
276 acpi_find_root_pointer(&pa);
281 void __iomem *__init_refok
282 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
284 if (phys > ULONG_MAX) {
285 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
288 if (acpi_gbl_permanent_mmap)
290 * ioremap checks to ensure this is in reserved space
292 return ioremap((unsigned long)phys, size);
294 return __acpi_map_table((unsigned long)phys, size);
296 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
298 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
300 if (acpi_gbl_permanent_mmap)
303 __acpi_unmap_table(virt, size);
305 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
307 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
309 if (!acpi_gbl_permanent_mmap)
310 __acpi_unmap_table(virt, size);
313 #ifdef ACPI_FUTURE_USAGE
315 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
318 return AE_BAD_PARAMETER;
320 *phys = virt_to_phys(virt);
326 #define ACPI_MAX_OVERRIDE_LEN 100
328 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
331 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
332 acpi_string * new_val)
334 if (!init_val || !new_val)
335 return AE_BAD_PARAMETER;
338 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
339 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
341 *new_val = acpi_os_name;
348 acpi_os_table_override(struct acpi_table_header * existing_table,
349 struct acpi_table_header ** new_table)
351 if (!existing_table || !new_table)
352 return AE_BAD_PARAMETER;
356 #ifdef CONFIG_ACPI_CUSTOM_DSDT
357 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
358 *new_table = (struct acpi_table_header *)AmlCode;
360 if (*new_table != NULL) {
361 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
362 "this is unsafe: tainting kernel\n",
363 existing_table->signature,
364 existing_table->oem_table_id);
365 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
370 static irqreturn_t acpi_irq(int irq, void *dev_id)
374 handled = (*acpi_irq_handler) (acpi_irq_context);
380 acpi_irq_not_handled++;
386 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
391 acpi_irq_stats_init();
394 * Ignore the GSI from the core, and use the value in our copy of the
395 * FADT. It may not be the same if an interrupt source override exists
398 gsi = acpi_gbl_FADT.sci_interrupt;
399 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
400 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
405 acpi_irq_handler = handler;
406 acpi_irq_context = context;
407 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
408 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
409 return AE_NOT_ACQUIRED;
416 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
419 free_irq(irq, acpi_irq);
420 acpi_irq_handler = NULL;
428 * Running in interpreter thread context, safe to sleep
431 void acpi_os_sleep(u64 ms)
433 schedule_timeout_interruptible(msecs_to_jiffies(ms));
436 void acpi_os_stall(u32 us)
444 touch_nmi_watchdog();
450 * Support ACPI 3.0 AML Timer operand
451 * Returns 64-bit free-running, monotonically increasing timer
452 * with 100ns granularity
454 u64 acpi_os_get_timer(void)
459 /* TBD: use HPET if available */
462 #ifdef CONFIG_X86_PM_TIMER
463 /* TBD: default to PM timer if HPET was not available */
466 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
471 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
480 *(u8 *) value = inb(port);
481 } else if (width <= 16) {
482 *(u16 *) value = inw(port);
483 } else if (width <= 32) {
484 *(u32 *) value = inl(port);
492 EXPORT_SYMBOL(acpi_os_read_port);
494 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
498 } else if (width <= 16) {
500 } else if (width <= 32) {
509 EXPORT_SYMBOL(acpi_os_write_port);
512 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
515 void __iomem *virt_addr;
517 virt_addr = ioremap(phys_addr, width);
523 *(u8 *) value = readb(virt_addr);
526 *(u16 *) value = readw(virt_addr);
529 *(u32 *) value = readl(virt_addr);
541 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
543 void __iomem *virt_addr;
545 virt_addr = ioremap(phys_addr, width);
549 writeb(value, virt_addr);
552 writew(value, virt_addr);
555 writel(value, virt_addr);
567 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
568 u64 *value, u32 width)
574 return AE_BAD_PARAMETER;
590 result = raw_pci_read(pci_id->segment, pci_id->bus,
591 PCI_DEVFN(pci_id->device, pci_id->function),
592 reg, size, &value32);
595 return (result ? AE_ERROR : AE_OK);
599 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
600 u64 value, u32 width)
618 result = raw_pci_write(pci_id->segment, pci_id->bus,
619 PCI_DEVFN(pci_id->device, pci_id->function),
622 return (result ? AE_ERROR : AE_OK);
625 static void acpi_os_execute_deferred(struct work_struct *work)
627 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
630 acpi_os_wait_events_complete(NULL);
632 dpc->function(dpc->context);
636 /*******************************************************************************
638 * FUNCTION: acpi_os_execute
640 * PARAMETERS: Type - Type of the callback
641 * Function - Function to be executed
642 * Context - Function parameters
646 * DESCRIPTION: Depending on type, either queues function for deferred execution or
647 * immediately executes function on a separate thread.
649 ******************************************************************************/
651 static acpi_status __acpi_os_execute(acpi_execute_type type,
652 acpi_osd_exec_callback function, void *context, int hp)
654 acpi_status status = AE_OK;
655 struct acpi_os_dpc *dpc;
656 struct workqueue_struct *queue;
658 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
659 "Scheduling function [%p(%p)] for deferred execution.\n",
663 * Allocate/initialize DPC structure. Note that this memory will be
664 * freed by the callee. The kernel handles the work_struct list in a
665 * way that allows us to also free its memory inside the callee.
666 * Because we may want to schedule several tasks with different
667 * parameters we can't use the approach some kernel code uses of
668 * having a static work_struct.
671 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
675 dpc->function = function;
676 dpc->context = context;
679 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
680 * because the hotplug code may call driver .remove() functions,
681 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
682 * to flush these workqueues.
684 queue = hp ? kacpi_hotplug_wq :
685 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
686 dpc->wait = hp ? 1 : 0;
688 if (queue == kacpi_hotplug_wq)
689 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
690 else if (queue == kacpi_notify_wq)
691 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
693 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
696 * On some machines, a software-initiated SMI causes corruption unless
697 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
698 * typically it's done in GPE-related methods that are run via
699 * workqueues, so we can avoid the known corruption cases by always
702 ret = queue_work_on(0, queue, &dpc->work);
705 printk(KERN_ERR PREFIX
706 "Call to queue_work() failed.\n");
713 acpi_status acpi_os_execute(acpi_execute_type type,
714 acpi_osd_exec_callback function, void *context)
716 return __acpi_os_execute(type, function, context, 0);
718 EXPORT_SYMBOL(acpi_os_execute);
720 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
723 return __acpi_os_execute(0, function, context, 1);
726 void acpi_os_wait_events_complete(void *context)
728 flush_workqueue(kacpid_wq);
729 flush_workqueue(kacpi_notify_wq);
732 EXPORT_SYMBOL(acpi_os_wait_events_complete);
735 * Allocate the memory for a spinlock and initialize it.
737 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
739 spin_lock_init(*handle);
745 * Deallocate the memory for a spinlock.
747 void acpi_os_delete_lock(acpi_spinlock handle)
753 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
755 struct semaphore *sem = NULL;
757 sem = acpi_os_allocate(sizeof(struct semaphore));
760 memset(sem, 0, sizeof(struct semaphore));
762 sema_init(sem, initial_units);
764 *handle = (acpi_handle *) sem;
766 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
767 *handle, initial_units));
773 * TODO: A better way to delete semaphores? Linux doesn't have a
774 * 'delete_semaphore()' function -- may result in an invalid
775 * pointer dereference for non-synchronized consumers. Should
776 * we at least check for blocked threads and signal/cancel them?
779 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
781 struct semaphore *sem = (struct semaphore *)handle;
784 return AE_BAD_PARAMETER;
786 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
788 BUG_ON(!list_empty(&sem->wait_list));
796 * TODO: Support for units > 1?
798 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
800 acpi_status status = AE_OK;
801 struct semaphore *sem = (struct semaphore *)handle;
805 if (!sem || (units < 1))
806 return AE_BAD_PARAMETER;
811 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
812 handle, units, timeout));
814 if (timeout == ACPI_WAIT_FOREVER)
815 jiffies = MAX_SCHEDULE_TIMEOUT;
817 jiffies = msecs_to_jiffies(timeout);
819 ret = down_timeout(sem, jiffies);
823 if (ACPI_FAILURE(status)) {
824 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
825 "Failed to acquire semaphore[%p|%d|%d], %s",
826 handle, units, timeout,
827 acpi_format_exception(status)));
829 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
830 "Acquired semaphore[%p|%d|%d]", handle,
838 * TODO: Support for units > 1?
840 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
842 struct semaphore *sem = (struct semaphore *)handle;
844 if (!sem || (units < 1))
845 return AE_BAD_PARAMETER;
850 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
858 #ifdef ACPI_FUTURE_USAGE
859 u32 acpi_os_get_line(char *buffer)
862 #ifdef ENABLE_DEBUGGER
863 if (acpi_in_debugger) {
866 kdb_read(buffer, sizeof(line_buf));
868 /* remove the CR kdb includes */
869 chars = strlen(buffer) - 1;
870 buffer[chars] = '\0';
876 #endif /* ACPI_FUTURE_USAGE */
878 acpi_status acpi_os_signal(u32 function, void *info)
881 case ACPI_SIGNAL_FATAL:
882 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
884 case ACPI_SIGNAL_BREAKPOINT:
887 * ACPI spec. says to treat it as a NOP unless
888 * you are debugging. So if/when we integrate
889 * AML debugger into the kernel debugger its
890 * hook will go here. But until then it is
891 * not useful to print anything on breakpoints.
901 static int __init acpi_os_name_setup(char *str)
903 char *p = acpi_os_name;
904 int count = ACPI_MAX_OVERRIDE_LEN - 1;
909 for (; count-- && str && *str; str++) {
910 if (isalnum(*str) || *str == ' ' || *str == ':')
912 else if (*str == '\'' || *str == '"')
923 __setup("acpi_os_name=", acpi_os_name_setup);
925 static void __init set_osi_linux(unsigned int enable)
927 if (osi_linux.enable != enable) {
928 osi_linux.enable = enable;
929 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
930 enable ? "Add": "Delet");
933 if (osi_linux.enable)
934 acpi_osi_setup("Linux");
936 acpi_osi_setup("!Linux");
941 static void __init acpi_cmdline_osi_linux(unsigned int enable)
943 osi_linux.cmdline = 1; /* cmdline set the default */
944 set_osi_linux(enable);
949 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
951 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
953 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
958 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
960 set_osi_linux(enable);
966 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
968 * empty string disables _OSI
969 * string starting with '!' disables that string
970 * otherwise string is added to list, augmenting built-in strings
972 static void __init acpi_osi_setup_late(void)
974 char *str = osi_setup_string;
979 if (!strcmp("!Linux", str)) {
980 acpi_cmdline_osi_linux(0); /* !enable */
981 } else if (*str == '!') {
982 if (acpi_remove_interface(++str) == AE_OK)
983 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
984 } else if (!strcmp("Linux", str)) {
985 acpi_cmdline_osi_linux(1); /* enable */
987 if (acpi_install_interface(str) == AE_OK)
988 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
992 int __init acpi_osi_setup(char *str)
994 if (str == NULL || *str == '\0') {
995 printk(KERN_INFO PREFIX "_OSI method disabled\n");
996 acpi_gbl_create_osi_method = FALSE;
998 strncpy(osi_setup_string, str, OSI_STRING_LENGTH_MAX);
1004 __setup("acpi_osi=", acpi_osi_setup);
1006 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1007 static int __init acpi_serialize_setup(char *str)
1009 printk(KERN_INFO PREFIX "serialize enabled\n");
1011 acpi_gbl_all_methods_serialized = TRUE;
1016 __setup("acpi_serialize", acpi_serialize_setup);
1018 /* Check of resource interference between native drivers and ACPI
1019 * OperationRegions (SystemIO and System Memory only).
1020 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1021 * in arbitrary AML code and can interfere with legacy drivers.
1022 * acpi_enforce_resources= can be set to:
1024 * - strict (default) (2)
1025 * -> further driver trying to access the resources will not load
1027 * -> further driver trying to access the resources will load, but you
1028 * get a system message that something might go wrong...
1031 * -> ACPI Operation Region resources will not be registered
1034 #define ENFORCE_RESOURCES_STRICT 2
1035 #define ENFORCE_RESOURCES_LAX 1
1036 #define ENFORCE_RESOURCES_NO 0
1038 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1040 static int __init acpi_enforce_resources_setup(char *str)
1042 if (str == NULL || *str == '\0')
1045 if (!strcmp("strict", str))
1046 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1047 else if (!strcmp("lax", str))
1048 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1049 else if (!strcmp("no", str))
1050 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1055 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1057 /* Check for resource conflicts between ACPI OperationRegions and native
1059 int acpi_check_resource_conflict(const struct resource *res)
1061 struct acpi_res_list *res_list_elem;
1065 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1067 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1070 ioport = res->flags & IORESOURCE_IO;
1072 spin_lock(&acpi_res_lock);
1073 list_for_each_entry(res_list_elem, &resource_list_head,
1075 if (ioport && (res_list_elem->resource_type
1076 != ACPI_ADR_SPACE_SYSTEM_IO))
1078 if (!ioport && (res_list_elem->resource_type
1079 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1082 if (res->end < res_list_elem->start
1083 || res_list_elem->end < res->start)
1088 spin_unlock(&acpi_res_lock);
1091 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1092 printk(KERN_WARNING "ACPI: resource %s %pR"
1093 " conflicts with ACPI region %s %pR\n",
1094 res->name, res, res_list_elem->name,
1096 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1097 printk(KERN_NOTICE "ACPI: This conflict may"
1098 " cause random problems and system"
1100 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1101 " for this device, you should use it instead of"
1102 " the native driver\n");
1104 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1109 EXPORT_SYMBOL(acpi_check_resource_conflict);
1111 int acpi_check_region(resource_size_t start, resource_size_t n,
1114 struct resource res = {
1116 .end = start + n - 1,
1118 .flags = IORESOURCE_IO,
1121 return acpi_check_resource_conflict(&res);
1123 EXPORT_SYMBOL(acpi_check_region);
1125 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1128 struct resource res = {
1130 .end = start + n - 1,
1132 .flags = IORESOURCE_MEM,
1135 return acpi_check_resource_conflict(&res);
1138 EXPORT_SYMBOL(acpi_check_mem_region);
1141 * Let drivers know whether the resource checks are effective
1143 int acpi_resources_are_enforced(void)
1145 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1147 EXPORT_SYMBOL(acpi_resources_are_enforced);
1150 * Acquire a spinlock.
1152 * handle is a pointer to the spinlock_t.
1155 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1157 acpi_cpu_flags flags;
1158 spin_lock_irqsave(lockp, flags);
1163 * Release a spinlock. See above.
1166 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1168 spin_unlock_irqrestore(lockp, flags);
1171 #ifndef ACPI_USE_LOCAL_CACHE
1173 /*******************************************************************************
1175 * FUNCTION: acpi_os_create_cache
1177 * PARAMETERS: name - Ascii name for the cache
1178 * size - Size of each cached object
1179 * depth - Maximum depth of the cache (in objects) <ignored>
1180 * cache - Where the new cache object is returned
1184 * DESCRIPTION: Create a cache object
1186 ******************************************************************************/
1189 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1191 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1198 /*******************************************************************************
1200 * FUNCTION: acpi_os_purge_cache
1202 * PARAMETERS: Cache - Handle to cache object
1206 * DESCRIPTION: Free all objects within the requested cache.
1208 ******************************************************************************/
1210 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1212 kmem_cache_shrink(cache);
1216 /*******************************************************************************
1218 * FUNCTION: acpi_os_delete_cache
1220 * PARAMETERS: Cache - Handle to cache object
1224 * DESCRIPTION: Free all objects within the requested cache and delete the
1227 ******************************************************************************/
1229 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1231 kmem_cache_destroy(cache);
1235 /*******************************************************************************
1237 * FUNCTION: acpi_os_release_object
1239 * PARAMETERS: Cache - Handle to cache object
1240 * Object - The object to be released
1244 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1245 * the object is deleted.
1247 ******************************************************************************/
1249 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1251 kmem_cache_free(cache, object);
1255 static inline int acpi_res_list_add(struct acpi_res_list *res)
1257 struct acpi_res_list *res_list_elem;
1259 list_for_each_entry(res_list_elem, &resource_list_head,
1262 if (res->resource_type == res_list_elem->resource_type &&
1263 res->start == res_list_elem->start &&
1264 res->end == res_list_elem->end) {
1267 * The Region(addr,len) already exist in the list,
1268 * just increase the count
1271 res_list_elem->count++;
1277 list_add(&res->resource_list, &resource_list_head);
1281 static inline void acpi_res_list_del(struct acpi_res_list *res)
1283 struct acpi_res_list *res_list_elem;
1285 list_for_each_entry(res_list_elem, &resource_list_head,
1288 if (res->resource_type == res_list_elem->resource_type &&
1289 res->start == res_list_elem->start &&
1290 res->end == res_list_elem->end) {
1293 * If the res count is decreased to 0,
1294 * remove and free it
1297 if (--res_list_elem->count == 0) {
1298 list_del(&res_list_elem->resource_list);
1299 kfree(res_list_elem);
1307 acpi_os_invalidate_address(
1309 acpi_physical_address address,
1312 struct acpi_res_list res;
1315 case ACPI_ADR_SPACE_SYSTEM_IO:
1316 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1317 /* Only interference checks against SystemIO and SystemMemory
1319 res.start = address;
1320 res.end = address + length - 1;
1321 res.resource_type = space_id;
1322 spin_lock(&acpi_res_lock);
1323 acpi_res_list_del(&res);
1324 spin_unlock(&acpi_res_lock);
1326 case ACPI_ADR_SPACE_PCI_CONFIG:
1327 case ACPI_ADR_SPACE_EC:
1328 case ACPI_ADR_SPACE_SMBUS:
1329 case ACPI_ADR_SPACE_CMOS:
1330 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1331 case ACPI_ADR_SPACE_DATA_TABLE:
1332 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1338 /******************************************************************************
1340 * FUNCTION: acpi_os_validate_address
1342 * PARAMETERS: space_id - ACPI space ID
1343 * address - Physical address
1344 * length - Address length
1346 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1347 * should return AE_AML_ILLEGAL_ADDRESS.
1349 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1350 * the addresses accessed by AML operation regions.
1352 *****************************************************************************/
1355 acpi_os_validate_address (
1357 acpi_physical_address address,
1361 struct acpi_res_list *res;
1363 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1367 case ACPI_ADR_SPACE_SYSTEM_IO:
1368 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1369 /* Only interference checks against SystemIO and SystemMemory
1371 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1374 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1375 strlcpy(res->name, name, 5);
1376 res->start = address;
1377 res->end = address + length - 1;
1378 res->resource_type = space_id;
1379 spin_lock(&acpi_res_lock);
1380 added = acpi_res_list_add(res);
1381 spin_unlock(&acpi_res_lock);
1382 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1383 "name: %s\n", added ? "Added" : "Already exist",
1384 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1385 ? "SystemIO" : "System Memory",
1386 (unsigned long long)res->start,
1387 (unsigned long long)res->end,
1392 case ACPI_ADR_SPACE_PCI_CONFIG:
1393 case ACPI_ADR_SPACE_EC:
1394 case ACPI_ADR_SPACE_SMBUS:
1395 case ACPI_ADR_SPACE_CMOS:
1396 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1397 case ACPI_ADR_SPACE_DATA_TABLE:
1398 case ACPI_ADR_SPACE_FIXED_HARDWARE: