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;
538 acpi_os_table_override(struct acpi_table_header * existing_table,
539 struct acpi_table_header ** new_table)
541 if (!existing_table || !new_table)
542 return AE_BAD_PARAMETER;
546 #ifdef CONFIG_ACPI_CUSTOM_DSDT
547 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
548 *new_table = (struct acpi_table_header *)AmlCode;
550 if (*new_table != NULL) {
551 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
552 "this is unsafe: tainting kernel\n",
553 existing_table->signature,
554 existing_table->oem_table_id);
555 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
561 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
562 acpi_physical_address * new_address,
563 u32 *new_table_length)
569 static irqreturn_t acpi_irq(int irq, void *dev_id)
573 handled = (*acpi_irq_handler) (acpi_irq_context);
579 acpi_irq_not_handled++;
585 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
590 acpi_irq_stats_init();
593 * ACPI interrupts different from the SCI in our copy of the FADT are
596 if (gsi != acpi_gbl_FADT.sci_interrupt)
597 return AE_BAD_PARAMETER;
599 if (acpi_irq_handler)
600 return AE_ALREADY_ACQUIRED;
602 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
603 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
608 acpi_irq_handler = handler;
609 acpi_irq_context = context;
610 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
611 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
612 acpi_irq_handler = NULL;
613 return AE_NOT_ACQUIRED;
619 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
621 if (irq != acpi_gbl_FADT.sci_interrupt)
622 return AE_BAD_PARAMETER;
624 free_irq(irq, acpi_irq);
625 acpi_irq_handler = NULL;
631 * Running in interpreter thread context, safe to sleep
634 void acpi_os_sleep(u64 ms)
636 schedule_timeout_interruptible(msecs_to_jiffies(ms));
639 void acpi_os_stall(u32 us)
647 touch_nmi_watchdog();
653 * Support ACPI 3.0 AML Timer operand
654 * Returns 64-bit free-running, monotonically increasing timer
655 * with 100ns granularity
657 u64 acpi_os_get_timer(void)
662 /* TBD: use HPET if available */
665 #ifdef CONFIG_X86_PM_TIMER
666 /* TBD: default to PM timer if HPET was not available */
669 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
674 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
683 *(u8 *) value = inb(port);
684 } else if (width <= 16) {
685 *(u16 *) value = inw(port);
686 } else if (width <= 32) {
687 *(u32 *) value = inl(port);
695 EXPORT_SYMBOL(acpi_os_read_port);
697 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
701 } else if (width <= 16) {
703 } else if (width <= 32) {
712 EXPORT_SYMBOL(acpi_os_write_port);
715 static inline u64 read64(const volatile void __iomem *addr)
720 static inline u64 read64(const volatile void __iomem *addr)
725 return l | (h << 32);
730 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
732 void __iomem *virt_addr;
733 unsigned int size = width / 8;
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
741 virt_addr = acpi_os_ioremap(phys_addr, size);
743 return AE_BAD_ADDRESS;
752 *(u8 *) value = readb(virt_addr);
755 *(u16 *) value = readw(virt_addr);
758 *(u32 *) value = readl(virt_addr);
761 *(u64 *) value = read64(virt_addr);
776 static inline void write64(u64 val, volatile void __iomem *addr)
781 static inline void write64(u64 val, volatile void __iomem *addr)
784 writel(val>>32, addr+4);
789 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
791 void __iomem *virt_addr;
792 unsigned int size = width / 8;
796 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
799 virt_addr = acpi_os_ioremap(phys_addr, size);
801 return AE_BAD_ADDRESS;
807 writeb(value, virt_addr);
810 writew(value, virt_addr);
813 writel(value, virt_addr);
816 write64(value, virt_addr);
831 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
832 u64 *value, u32 width)
838 return AE_BAD_PARAMETER;
854 result = raw_pci_read(pci_id->segment, pci_id->bus,
855 PCI_DEVFN(pci_id->device, pci_id->function),
856 reg, size, &value32);
859 return (result ? AE_ERROR : AE_OK);
863 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
864 u64 value, u32 width)
882 result = raw_pci_write(pci_id->segment, pci_id->bus,
883 PCI_DEVFN(pci_id->device, pci_id->function),
886 return (result ? AE_ERROR : AE_OK);
889 static void acpi_os_execute_deferred(struct work_struct *work)
891 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
894 acpi_os_wait_events_complete();
896 dpc->function(dpc->context);
900 /*******************************************************************************
902 * FUNCTION: acpi_os_execute
904 * PARAMETERS: Type - Type of the callback
905 * Function - Function to be executed
906 * Context - Function parameters
910 * DESCRIPTION: Depending on type, either queues function for deferred execution or
911 * immediately executes function on a separate thread.
913 ******************************************************************************/
915 static acpi_status __acpi_os_execute(acpi_execute_type type,
916 acpi_osd_exec_callback function, void *context, int hp)
918 acpi_status status = AE_OK;
919 struct acpi_os_dpc *dpc;
920 struct workqueue_struct *queue;
922 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
923 "Scheduling function [%p(%p)] for deferred execution.\n",
927 * Allocate/initialize DPC structure. Note that this memory will be
928 * freed by the callee. The kernel handles the work_struct list in a
929 * way that allows us to also free its memory inside the callee.
930 * Because we may want to schedule several tasks with different
931 * parameters we can't use the approach some kernel code uses of
932 * having a static work_struct.
935 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
939 dpc->function = function;
940 dpc->context = context;
943 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
944 * because the hotplug code may call driver .remove() functions,
945 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
946 * to flush these workqueues.
948 * To prevent lockdep from complaining unnecessarily, make sure that
949 * there is a different static lockdep key for each workqueue by using
950 * INIT_WORK() for each of them separately.
953 queue = kacpi_hotplug_wq;
955 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
956 } else if (type == OSL_NOTIFY_HANDLER) {
957 queue = kacpi_notify_wq;
958 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
961 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
965 * On some machines, a software-initiated SMI causes corruption unless
966 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
967 * typically it's done in GPE-related methods that are run via
968 * workqueues, so we can avoid the known corruption cases by always
971 ret = queue_work_on(0, queue, &dpc->work);
974 printk(KERN_ERR PREFIX
975 "Call to queue_work() failed.\n");
982 acpi_status acpi_os_execute(acpi_execute_type type,
983 acpi_osd_exec_callback function, void *context)
985 return __acpi_os_execute(type, function, context, 0);
987 EXPORT_SYMBOL(acpi_os_execute);
989 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
992 return __acpi_os_execute(0, function, context, 1);
994 EXPORT_SYMBOL(acpi_os_hotplug_execute);
996 void acpi_os_wait_events_complete(void)
998 flush_workqueue(kacpid_wq);
999 flush_workqueue(kacpi_notify_wq);
1002 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1005 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1007 struct semaphore *sem = NULL;
1009 sem = acpi_os_allocate(sizeof(struct semaphore));
1011 return AE_NO_MEMORY;
1012 memset(sem, 0, sizeof(struct semaphore));
1014 sema_init(sem, initial_units);
1016 *handle = (acpi_handle *) sem;
1018 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1019 *handle, initial_units));
1025 * TODO: A better way to delete semaphores? Linux doesn't have a
1026 * 'delete_semaphore()' function -- may result in an invalid
1027 * pointer dereference for non-synchronized consumers. Should
1028 * we at least check for blocked threads and signal/cancel them?
1031 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1033 struct semaphore *sem = (struct semaphore *)handle;
1036 return AE_BAD_PARAMETER;
1038 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1040 BUG_ON(!list_empty(&sem->wait_list));
1048 * TODO: Support for units > 1?
1050 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1052 acpi_status status = AE_OK;
1053 struct semaphore *sem = (struct semaphore *)handle;
1057 if (!sem || (units < 1))
1058 return AE_BAD_PARAMETER;
1063 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1064 handle, units, timeout));
1066 if (timeout == ACPI_WAIT_FOREVER)
1067 jiffies = MAX_SCHEDULE_TIMEOUT;
1069 jiffies = msecs_to_jiffies(timeout);
1071 ret = down_timeout(sem, jiffies);
1075 if (ACPI_FAILURE(status)) {
1076 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1077 "Failed to acquire semaphore[%p|%d|%d], %s",
1078 handle, units, timeout,
1079 acpi_format_exception(status)));
1081 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1082 "Acquired semaphore[%p|%d|%d]", handle,
1090 * TODO: Support for units > 1?
1092 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1094 struct semaphore *sem = (struct semaphore *)handle;
1096 if (!sem || (units < 1))
1097 return AE_BAD_PARAMETER;
1102 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1110 #ifdef ACPI_FUTURE_USAGE
1111 u32 acpi_os_get_line(char *buffer)
1114 #ifdef ENABLE_DEBUGGER
1115 if (acpi_in_debugger) {
1118 kdb_read(buffer, sizeof(line_buf));
1120 /* remove the CR kdb includes */
1121 chars = strlen(buffer) - 1;
1122 buffer[chars] = '\0';
1128 #endif /* ACPI_FUTURE_USAGE */
1130 acpi_status acpi_os_signal(u32 function, void *info)
1133 case ACPI_SIGNAL_FATAL:
1134 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1136 case ACPI_SIGNAL_BREAKPOINT:
1139 * ACPI spec. says to treat it as a NOP unless
1140 * you are debugging. So if/when we integrate
1141 * AML debugger into the kernel debugger its
1142 * hook will go here. But until then it is
1143 * not useful to print anything on breakpoints.
1153 static int __init acpi_os_name_setup(char *str)
1155 char *p = acpi_os_name;
1156 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1161 for (; count-- && str && *str; str++) {
1162 if (isalnum(*str) || *str == ' ' || *str == ':')
1164 else if (*str == '\'' || *str == '"')
1175 __setup("acpi_os_name=", acpi_os_name_setup);
1177 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1178 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1180 struct osi_setup_entry {
1181 char string[OSI_STRING_LENGTH_MAX];
1185 static struct osi_setup_entry __initdata
1186 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1187 {"Module Device", true},
1188 {"Processor Device", true},
1189 {"3.0 _SCP Extensions", true},
1190 {"Processor Aggregator Device", true},
1193 void __init acpi_osi_setup(char *str)
1195 struct osi_setup_entry *osi;
1199 if (!acpi_gbl_create_osi_method)
1202 if (str == NULL || *str == '\0') {
1203 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1204 acpi_gbl_create_osi_method = FALSE;
1213 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1214 osi = &osi_setup_entries[i];
1215 if (!strcmp(osi->string, str)) {
1216 osi->enable = enable;
1218 } else if (osi->string[0] == '\0') {
1219 osi->enable = enable;
1220 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1226 static void __init set_osi_linux(unsigned int enable)
1228 if (osi_linux.enable != enable)
1229 osi_linux.enable = enable;
1231 if (osi_linux.enable)
1232 acpi_osi_setup("Linux");
1234 acpi_osi_setup("!Linux");
1239 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1241 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1243 set_osi_linux(enable);
1248 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1250 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1255 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1256 set_osi_linux(enable);
1262 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1264 * empty string disables _OSI
1265 * string starting with '!' disables that string
1266 * otherwise string is added to list, augmenting built-in strings
1268 static void __init acpi_osi_setup_late(void)
1270 struct osi_setup_entry *osi;
1275 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1276 osi = &osi_setup_entries[i];
1282 status = acpi_install_interface(str);
1284 if (ACPI_SUCCESS(status))
1285 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1287 status = acpi_remove_interface(str);
1289 if (ACPI_SUCCESS(status))
1290 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1295 static int __init osi_setup(char *str)
1297 if (str && !strcmp("Linux", str))
1298 acpi_cmdline_osi_linux(1);
1299 else if (str && !strcmp("!Linux", str))
1300 acpi_cmdline_osi_linux(0);
1302 acpi_osi_setup(str);
1307 __setup("acpi_osi=", osi_setup);
1309 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1310 static int __init acpi_serialize_setup(char *str)
1312 printk(KERN_INFO PREFIX "serialize enabled\n");
1314 acpi_gbl_all_methods_serialized = TRUE;
1319 __setup("acpi_serialize", acpi_serialize_setup);
1321 /* Check of resource interference between native drivers and ACPI
1322 * OperationRegions (SystemIO and System Memory only).
1323 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1324 * in arbitrary AML code and can interfere with legacy drivers.
1325 * acpi_enforce_resources= can be set to:
1327 * - strict (default) (2)
1328 * -> further driver trying to access the resources will not load
1330 * -> further driver trying to access the resources will load, but you
1331 * get a system message that something might go wrong...
1334 * -> ACPI Operation Region resources will not be registered
1337 #define ENFORCE_RESOURCES_STRICT 2
1338 #define ENFORCE_RESOURCES_LAX 1
1339 #define ENFORCE_RESOURCES_NO 0
1341 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1343 static int __init acpi_enforce_resources_setup(char *str)
1345 if (str == NULL || *str == '\0')
1348 if (!strcmp("strict", str))
1349 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1350 else if (!strcmp("lax", str))
1351 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1352 else if (!strcmp("no", str))
1353 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1358 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1360 /* Check for resource conflicts between ACPI OperationRegions and native
1362 int acpi_check_resource_conflict(const struct resource *res)
1364 acpi_adr_space_type space_id;
1369 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1371 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1374 if (res->flags & IORESOURCE_IO)
1375 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1377 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1379 length = res->end - res->start + 1;
1380 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1382 clash = acpi_check_address_range(space_id, res->start, length, warn);
1385 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1386 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1387 printk(KERN_NOTICE "ACPI: This conflict may"
1388 " cause random problems and system"
1390 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1391 " for this device, you should use it instead of"
1392 " the native driver\n");
1394 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1399 EXPORT_SYMBOL(acpi_check_resource_conflict);
1401 int acpi_check_region(resource_size_t start, resource_size_t n,
1404 struct resource res = {
1406 .end = start + n - 1,
1408 .flags = IORESOURCE_IO,
1411 return acpi_check_resource_conflict(&res);
1413 EXPORT_SYMBOL(acpi_check_region);
1416 * Let drivers know whether the resource checks are effective
1418 int acpi_resources_are_enforced(void)
1420 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1422 EXPORT_SYMBOL(acpi_resources_are_enforced);
1425 * Deallocate the memory for a spinlock.
1427 void acpi_os_delete_lock(acpi_spinlock handle)
1433 * Acquire a spinlock.
1435 * handle is a pointer to the spinlock_t.
1438 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1440 acpi_cpu_flags flags;
1441 spin_lock_irqsave(lockp, flags);
1446 * Release a spinlock. See above.
1449 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1451 spin_unlock_irqrestore(lockp, flags);
1454 #ifndef ACPI_USE_LOCAL_CACHE
1456 /*******************************************************************************
1458 * FUNCTION: acpi_os_create_cache
1460 * PARAMETERS: name - Ascii name for the cache
1461 * size - Size of each cached object
1462 * depth - Maximum depth of the cache (in objects) <ignored>
1463 * cache - Where the new cache object is returned
1467 * DESCRIPTION: Create a cache object
1469 ******************************************************************************/
1472 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1474 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1481 /*******************************************************************************
1483 * FUNCTION: acpi_os_purge_cache
1485 * PARAMETERS: Cache - Handle to cache object
1489 * DESCRIPTION: Free all objects within the requested cache.
1491 ******************************************************************************/
1493 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1495 kmem_cache_shrink(cache);
1499 /*******************************************************************************
1501 * FUNCTION: acpi_os_delete_cache
1503 * PARAMETERS: Cache - Handle to cache object
1507 * DESCRIPTION: Free all objects within the requested cache and delete the
1510 ******************************************************************************/
1512 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1514 kmem_cache_destroy(cache);
1518 /*******************************************************************************
1520 * FUNCTION: acpi_os_release_object
1522 * PARAMETERS: Cache - Handle to cache object
1523 * Object - The object to be released
1527 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1528 * the object is deleted.
1530 ******************************************************************************/
1532 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1534 kmem_cache_free(cache, object);
1539 acpi_status __init acpi_os_initialize(void)
1541 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1542 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1543 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1544 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1549 acpi_status __init acpi_os_initialize1(void)
1551 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1552 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1553 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1555 BUG_ON(!kacpi_notify_wq);
1556 BUG_ON(!kacpi_hotplug_wq);
1557 acpi_install_interface_handler(acpi_osi_handler);
1558 acpi_osi_setup_late();
1562 acpi_status acpi_os_terminate(void)
1564 if (acpi_irq_handler) {
1565 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1569 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1570 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1571 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1572 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1574 destroy_workqueue(kacpid_wq);
1575 destroy_workqueue(kacpi_notify_wq);
1576 destroy_workqueue(kacpi_hotplug_wq);
1581 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1585 if (__acpi_os_prepare_sleep)
1586 rc = __acpi_os_prepare_sleep(sleep_state,
1587 pm1a_control, pm1b_control);
1591 return AE_CTRL_SKIP;
1596 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1597 u32 pm1a_ctrl, u32 pm1b_ctrl))
1599 __acpi_os_prepare_sleep = func;