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[pohmelfs.git] / drivers / acpi / osl.c
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1 /*
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>
33 #include <linux/mm.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>
49 #include <asm/io.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: "
59 struct acpi_os_dpc {
60 acpi_osd_exec_callback function;
61 void *context;
62 struct work_struct work;
63 int wait;
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
68 #endif
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
73 /* stuff for debugger support */
74 int acpi_in_debugger;
75 EXPORT_SYMBOL(acpi_in_debugger);
77 extern char line_buf[80];
78 #endif /*ENABLE_DEBUGGER */
80 static acpi_osd_handler acpi_irq_handler;
81 static void *acpi_irq_context;
82 static struct workqueue_struct *kacpid_wq;
83 static struct workqueue_struct *kacpi_notify_wq;
84 struct workqueue_struct *kacpi_hotplug_wq;
85 EXPORT_SYMBOL(kacpi_hotplug_wq);
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
91 struct acpi_ioremap {
92 struct list_head list;
93 void __iomem *virt;
94 acpi_physical_address phys;
95 acpi_size size;
96 unsigned long refcount;
99 static LIST_HEAD(acpi_ioremaps);
100 static DEFINE_MUTEX(acpi_ioremap_lock);
102 static void __init acpi_osi_setup_late(void);
105 * The story of _OSI(Linux)
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
137 static struct osi_linux {
138 unsigned int enable:1;
139 unsigned int dmi:1;
140 unsigned int cmdline:1;
141 } osi_linux = {0, 0, 0};
143 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145 if (!strcmp("Linux", interface)) {
147 printk_once(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" : "");
154 return supported;
157 static void __init acpi_request_region (struct acpi_generic_address *gas,
158 unsigned int length, char *desc)
160 u64 addr;
162 /* Handle possible alignment issues */
163 memcpy(&addr, &gas->address, sizeof(addr));
164 if (!addr || !length)
165 return;
167 /* Resources are never freed */
168 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
169 request_region(addr, length, desc);
170 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
171 request_mem_region(addr, length, desc);
174 static int __init acpi_reserve_resources(void)
176 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
177 "ACPI PM1a_EVT_BLK");
179 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
180 "ACPI PM1b_EVT_BLK");
182 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
183 "ACPI PM1a_CNT_BLK");
185 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
186 "ACPI PM1b_CNT_BLK");
188 if (acpi_gbl_FADT.pm_timer_length == 4)
189 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
192 "ACPI PM2_CNT_BLK");
194 /* Length of GPE blocks must be a non-negative multiple of 2 */
196 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
197 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
198 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
201 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
202 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
204 return 0;
206 device_initcall(acpi_reserve_resources);
208 void acpi_os_printf(const char *fmt, ...)
210 va_list args;
211 va_start(args, fmt);
212 acpi_os_vprintf(fmt, args);
213 va_end(args);
216 void acpi_os_vprintf(const char *fmt, va_list args)
218 static char buffer[512];
220 vsprintf(buffer, fmt, args);
222 #ifdef ENABLE_DEBUGGER
223 if (acpi_in_debugger) {
224 kdb_printf("%s", buffer);
225 } else {
226 printk(KERN_CONT "%s", buffer);
228 #else
229 printk(KERN_CONT "%s", buffer);
230 #endif
233 #ifdef CONFIG_KEXEC
234 static unsigned long acpi_rsdp;
235 static int __init setup_acpi_rsdp(char *arg)
237 acpi_rsdp = simple_strtoul(arg, NULL, 16);
238 return 0;
240 early_param("acpi_rsdp", setup_acpi_rsdp);
241 #endif
243 acpi_physical_address __init acpi_os_get_root_pointer(void)
245 #ifdef CONFIG_KEXEC
246 if (acpi_rsdp)
247 return acpi_rsdp;
248 #endif
250 if (efi_enabled) {
251 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
252 return efi.acpi20;
253 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
254 return efi.acpi;
255 else {
256 printk(KERN_ERR PREFIX
257 "System description tables not found\n");
258 return 0;
260 } else {
261 acpi_physical_address pa = 0;
263 acpi_find_root_pointer(&pa);
264 return pa;
268 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
269 static struct acpi_ioremap *
270 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
272 struct acpi_ioremap *map;
274 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
275 if (map->phys <= phys &&
276 phys + size <= map->phys + map->size)
277 return map;
279 return NULL;
282 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
283 static void __iomem *
284 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
286 struct acpi_ioremap *map;
288 map = acpi_map_lookup(phys, size);
289 if (map)
290 return map->virt + (phys - map->phys);
292 return NULL;
295 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
297 struct acpi_ioremap *map;
298 void __iomem *virt = NULL;
300 mutex_lock(&acpi_ioremap_lock);
301 map = acpi_map_lookup(phys, size);
302 if (map) {
303 virt = map->virt + (phys - map->phys);
304 map->refcount++;
306 mutex_unlock(&acpi_ioremap_lock);
307 return virt;
309 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
311 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
312 static struct acpi_ioremap *
313 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
315 struct acpi_ioremap *map;
317 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
318 if (map->virt <= virt &&
319 virt + size <= map->virt + map->size)
320 return map;
322 return NULL;
325 #ifndef CONFIG_IA64
326 #define should_use_kmap(pfn) page_is_ram(pfn)
327 #else
328 /* ioremap will take care of cache attributes */
329 #define should_use_kmap(pfn) 0
330 #endif
332 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
334 unsigned long pfn;
336 pfn = pg_off >> PAGE_SHIFT;
337 if (should_use_kmap(pfn)) {
338 if (pg_sz > PAGE_SIZE)
339 return NULL;
340 return (void __iomem __force *)kmap(pfn_to_page(pfn));
341 } else
342 return acpi_os_ioremap(pg_off, pg_sz);
345 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
347 unsigned long pfn;
349 pfn = pg_off >> PAGE_SHIFT;
350 if (page_is_ram(pfn))
351 kunmap(pfn_to_page(pfn));
352 else
353 iounmap(vaddr);
356 void __iomem *__init_refok
357 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
359 struct acpi_ioremap *map;
360 void __iomem *virt;
361 acpi_physical_address pg_off;
362 acpi_size pg_sz;
364 if (phys > ULONG_MAX) {
365 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
366 return NULL;
369 if (!acpi_gbl_permanent_mmap)
370 return __acpi_map_table((unsigned long)phys, size);
372 mutex_lock(&acpi_ioremap_lock);
373 /* Check if there's a suitable mapping already. */
374 map = acpi_map_lookup(phys, size);
375 if (map) {
376 map->refcount++;
377 goto out;
380 map = kzalloc(sizeof(*map), GFP_KERNEL);
381 if (!map) {
382 mutex_unlock(&acpi_ioremap_lock);
383 return NULL;
386 pg_off = round_down(phys, PAGE_SIZE);
387 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
388 virt = acpi_map(pg_off, pg_sz);
389 if (!virt) {
390 mutex_unlock(&acpi_ioremap_lock);
391 kfree(map);
392 return NULL;
395 INIT_LIST_HEAD(&map->list);
396 map->virt = virt;
397 map->phys = pg_off;
398 map->size = pg_sz;
399 map->refcount = 1;
401 list_add_tail_rcu(&map->list, &acpi_ioremaps);
403 out:
404 mutex_unlock(&acpi_ioremap_lock);
405 return map->virt + (phys - map->phys);
407 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
409 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
411 if (!--map->refcount)
412 list_del_rcu(&map->list);
415 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
417 if (!map->refcount) {
418 synchronize_rcu();
419 acpi_unmap(map->phys, map->virt);
420 kfree(map);
424 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
426 struct acpi_ioremap *map;
428 if (!acpi_gbl_permanent_mmap) {
429 __acpi_unmap_table(virt, size);
430 return;
433 mutex_lock(&acpi_ioremap_lock);
434 map = acpi_map_lookup_virt(virt, size);
435 if (!map) {
436 mutex_unlock(&acpi_ioremap_lock);
437 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
438 return;
440 acpi_os_drop_map_ref(map);
441 mutex_unlock(&acpi_ioremap_lock);
443 acpi_os_map_cleanup(map);
445 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
447 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
449 if (!acpi_gbl_permanent_mmap)
450 __acpi_unmap_table(virt, size);
453 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
455 u64 addr;
456 void __iomem *virt;
458 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
459 return 0;
461 /* Handle possible alignment issues */
462 memcpy(&addr, &gas->address, sizeof(addr));
463 if (!addr || !gas->bit_width)
464 return -EINVAL;
466 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
467 if (!virt)
468 return -EIO;
470 return 0;
472 EXPORT_SYMBOL(acpi_os_map_generic_address);
474 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
476 u64 addr;
477 struct acpi_ioremap *map;
479 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
480 return;
482 /* Handle possible alignment issues */
483 memcpy(&addr, &gas->address, sizeof(addr));
484 if (!addr || !gas->bit_width)
485 return;
487 mutex_lock(&acpi_ioremap_lock);
488 map = acpi_map_lookup(addr, gas->bit_width / 8);
489 if (!map) {
490 mutex_unlock(&acpi_ioremap_lock);
491 return;
493 acpi_os_drop_map_ref(map);
494 mutex_unlock(&acpi_ioremap_lock);
496 acpi_os_map_cleanup(map);
498 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
500 #ifdef ACPI_FUTURE_USAGE
501 acpi_status
502 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
504 if (!phys || !virt)
505 return AE_BAD_PARAMETER;
507 *phys = virt_to_phys(virt);
509 return AE_OK;
511 #endif
513 #define ACPI_MAX_OVERRIDE_LEN 100
515 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
517 acpi_status
518 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
519 acpi_string * new_val)
521 if (!init_val || !new_val)
522 return AE_BAD_PARAMETER;
524 *new_val = NULL;
525 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
526 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
527 acpi_os_name);
528 *new_val = acpi_os_name;
531 return AE_OK;
534 acpi_status
535 acpi_os_table_override(struct acpi_table_header * existing_table,
536 struct acpi_table_header ** new_table)
538 if (!existing_table || !new_table)
539 return AE_BAD_PARAMETER;
541 *new_table = NULL;
543 #ifdef CONFIG_ACPI_CUSTOM_DSDT
544 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
545 *new_table = (struct acpi_table_header *)AmlCode;
546 #endif
547 if (*new_table != NULL) {
548 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
549 "this is unsafe: tainting kernel\n",
550 existing_table->signature,
551 existing_table->oem_table_id);
552 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
554 return AE_OK;
557 static irqreturn_t acpi_irq(int irq, void *dev_id)
559 u32 handled;
561 handled = (*acpi_irq_handler) (acpi_irq_context);
563 if (handled) {
564 acpi_irq_handled++;
565 return IRQ_HANDLED;
566 } else {
567 acpi_irq_not_handled++;
568 return IRQ_NONE;
572 acpi_status
573 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
574 void *context)
576 unsigned int irq;
578 acpi_irq_stats_init();
581 * ACPI interrupts different from the SCI in our copy of the FADT are
582 * not supported.
584 if (gsi != acpi_gbl_FADT.sci_interrupt)
585 return AE_BAD_PARAMETER;
587 if (acpi_irq_handler)
588 return AE_ALREADY_ACQUIRED;
590 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
591 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
592 gsi);
593 return AE_OK;
596 acpi_irq_handler = handler;
597 acpi_irq_context = context;
598 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
599 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
600 acpi_irq_handler = NULL;
601 return AE_NOT_ACQUIRED;
604 return AE_OK;
607 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
609 if (irq != acpi_gbl_FADT.sci_interrupt)
610 return AE_BAD_PARAMETER;
612 free_irq(irq, acpi_irq);
613 acpi_irq_handler = NULL;
615 return AE_OK;
619 * Running in interpreter thread context, safe to sleep
622 void acpi_os_sleep(u64 ms)
624 schedule_timeout_interruptible(msecs_to_jiffies(ms));
627 void acpi_os_stall(u32 us)
629 while (us) {
630 u32 delay = 1000;
632 if (delay > us)
633 delay = us;
634 udelay(delay);
635 touch_nmi_watchdog();
636 us -= delay;
641 * Support ACPI 3.0 AML Timer operand
642 * Returns 64-bit free-running, monotonically increasing timer
643 * with 100ns granularity
645 u64 acpi_os_get_timer(void)
647 static u64 t;
649 #ifdef CONFIG_HPET
650 /* TBD: use HPET if available */
651 #endif
653 #ifdef CONFIG_X86_PM_TIMER
654 /* TBD: default to PM timer if HPET was not available */
655 #endif
656 if (!t)
657 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
659 return ++t;
662 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
664 u32 dummy;
666 if (!value)
667 value = &dummy;
669 *value = 0;
670 if (width <= 8) {
671 *(u8 *) value = inb(port);
672 } else if (width <= 16) {
673 *(u16 *) value = inw(port);
674 } else if (width <= 32) {
675 *(u32 *) value = inl(port);
676 } else {
677 BUG();
680 return AE_OK;
683 EXPORT_SYMBOL(acpi_os_read_port);
685 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
687 if (width <= 8) {
688 outb(value, port);
689 } else if (width <= 16) {
690 outw(value, port);
691 } else if (width <= 32) {
692 outl(value, port);
693 } else {
694 BUG();
697 return AE_OK;
700 EXPORT_SYMBOL(acpi_os_write_port);
702 acpi_status
703 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
705 void __iomem *virt_addr;
706 unsigned int size = width / 8;
707 bool unmap = false;
708 u32 dummy;
710 rcu_read_lock();
711 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
712 if (!virt_addr) {
713 rcu_read_unlock();
714 virt_addr = acpi_os_ioremap(phys_addr, size);
715 if (!virt_addr)
716 return AE_BAD_ADDRESS;
717 unmap = true;
720 if (!value)
721 value = &dummy;
723 switch (width) {
724 case 8:
725 *(u8 *) value = readb(virt_addr);
726 break;
727 case 16:
728 *(u16 *) value = readw(virt_addr);
729 break;
730 case 32:
731 *(u32 *) value = readl(virt_addr);
732 break;
733 default:
734 BUG();
737 if (unmap)
738 iounmap(virt_addr);
739 else
740 rcu_read_unlock();
742 return AE_OK;
745 #ifdef readq
746 static inline u64 read64(const volatile void __iomem *addr)
748 return readq(addr);
750 #else
751 static inline u64 read64(const volatile void __iomem *addr)
753 u64 l, h;
754 l = readl(addr);
755 h = readl(addr+4);
756 return l | (h << 32);
758 #endif
760 acpi_status
761 acpi_os_read_memory64(acpi_physical_address phys_addr, u64 *value, u32 width)
763 void __iomem *virt_addr;
764 unsigned int size = width / 8;
765 bool unmap = false;
766 u64 dummy;
768 rcu_read_lock();
769 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
770 if (!virt_addr) {
771 rcu_read_unlock();
772 virt_addr = acpi_os_ioremap(phys_addr, size);
773 if (!virt_addr)
774 return AE_BAD_ADDRESS;
775 unmap = true;
778 if (!value)
779 value = &dummy;
781 switch (width) {
782 case 8:
783 *(u8 *) value = readb(virt_addr);
784 break;
785 case 16:
786 *(u16 *) value = readw(virt_addr);
787 break;
788 case 32:
789 *(u32 *) value = readl(virt_addr);
790 break;
791 case 64:
792 *(u64 *) value = read64(virt_addr);
793 break;
794 default:
795 BUG();
798 if (unmap)
799 iounmap(virt_addr);
800 else
801 rcu_read_unlock();
803 return AE_OK;
806 acpi_status
807 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
809 void __iomem *virt_addr;
810 unsigned int size = width / 8;
811 bool unmap = false;
813 rcu_read_lock();
814 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
815 if (!virt_addr) {
816 rcu_read_unlock();
817 virt_addr = acpi_os_ioremap(phys_addr, size);
818 if (!virt_addr)
819 return AE_BAD_ADDRESS;
820 unmap = true;
823 switch (width) {
824 case 8:
825 writeb(value, virt_addr);
826 break;
827 case 16:
828 writew(value, virt_addr);
829 break;
830 case 32:
831 writel(value, virt_addr);
832 break;
833 default:
834 BUG();
837 if (unmap)
838 iounmap(virt_addr);
839 else
840 rcu_read_unlock();
842 return AE_OK;
845 #ifdef writeq
846 static inline void write64(u64 val, volatile void __iomem *addr)
848 writeq(val, addr);
850 #else
851 static inline void write64(u64 val, volatile void __iomem *addr)
853 writel(val, addr);
854 writel(val>>32, addr+4);
856 #endif
858 acpi_status
859 acpi_os_write_memory64(acpi_physical_address phys_addr, u64 value, u32 width)
861 void __iomem *virt_addr;
862 unsigned int size = width / 8;
863 bool unmap = false;
865 rcu_read_lock();
866 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
867 if (!virt_addr) {
868 rcu_read_unlock();
869 virt_addr = acpi_os_ioremap(phys_addr, size);
870 if (!virt_addr)
871 return AE_BAD_ADDRESS;
872 unmap = true;
875 switch (width) {
876 case 8:
877 writeb(value, virt_addr);
878 break;
879 case 16:
880 writew(value, virt_addr);
881 break;
882 case 32:
883 writel(value, virt_addr);
884 break;
885 case 64:
886 write64(value, virt_addr);
887 break;
888 default:
889 BUG();
892 if (unmap)
893 iounmap(virt_addr);
894 else
895 rcu_read_unlock();
897 return AE_OK;
900 acpi_status
901 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
902 u64 *value, u32 width)
904 int result, size;
905 u32 value32;
907 if (!value)
908 return AE_BAD_PARAMETER;
910 switch (width) {
911 case 8:
912 size = 1;
913 break;
914 case 16:
915 size = 2;
916 break;
917 case 32:
918 size = 4;
919 break;
920 default:
921 return AE_ERROR;
924 result = raw_pci_read(pci_id->segment, pci_id->bus,
925 PCI_DEVFN(pci_id->device, pci_id->function),
926 reg, size, &value32);
927 *value = value32;
929 return (result ? AE_ERROR : AE_OK);
932 acpi_status
933 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
934 u64 value, u32 width)
936 int result, size;
938 switch (width) {
939 case 8:
940 size = 1;
941 break;
942 case 16:
943 size = 2;
944 break;
945 case 32:
946 size = 4;
947 break;
948 default:
949 return AE_ERROR;
952 result = raw_pci_write(pci_id->segment, pci_id->bus,
953 PCI_DEVFN(pci_id->device, pci_id->function),
954 reg, size, value);
956 return (result ? AE_ERROR : AE_OK);
959 static void acpi_os_execute_deferred(struct work_struct *work)
961 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
963 if (dpc->wait)
964 acpi_os_wait_events_complete(NULL);
966 dpc->function(dpc->context);
967 kfree(dpc);
970 /*******************************************************************************
972 * FUNCTION: acpi_os_execute
974 * PARAMETERS: Type - Type of the callback
975 * Function - Function to be executed
976 * Context - Function parameters
978 * RETURN: Status
980 * DESCRIPTION: Depending on type, either queues function for deferred execution or
981 * immediately executes function on a separate thread.
983 ******************************************************************************/
985 static acpi_status __acpi_os_execute(acpi_execute_type type,
986 acpi_osd_exec_callback function, void *context, int hp)
988 acpi_status status = AE_OK;
989 struct acpi_os_dpc *dpc;
990 struct workqueue_struct *queue;
991 int ret;
992 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
993 "Scheduling function [%p(%p)] for deferred execution.\n",
994 function, context));
997 * Allocate/initialize DPC structure. Note that this memory will be
998 * freed by the callee. The kernel handles the work_struct list in a
999 * way that allows us to also free its memory inside the callee.
1000 * Because we may want to schedule several tasks with different
1001 * parameters we can't use the approach some kernel code uses of
1002 * having a static work_struct.
1005 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1006 if (!dpc)
1007 return AE_NO_MEMORY;
1009 dpc->function = function;
1010 dpc->context = context;
1013 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1014 * because the hotplug code may call driver .remove() functions,
1015 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1016 * to flush these workqueues.
1018 queue = hp ? kacpi_hotplug_wq :
1019 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
1020 dpc->wait = hp ? 1 : 0;
1022 if (queue == kacpi_hotplug_wq)
1023 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1024 else if (queue == kacpi_notify_wq)
1025 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1026 else
1027 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1030 * On some machines, a software-initiated SMI causes corruption unless
1031 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1032 * typically it's done in GPE-related methods that are run via
1033 * workqueues, so we can avoid the known corruption cases by always
1034 * queueing on CPU 0.
1036 ret = queue_work_on(0, queue, &dpc->work);
1038 if (!ret) {
1039 printk(KERN_ERR PREFIX
1040 "Call to queue_work() failed.\n");
1041 status = AE_ERROR;
1042 kfree(dpc);
1044 return status;
1047 acpi_status acpi_os_execute(acpi_execute_type type,
1048 acpi_osd_exec_callback function, void *context)
1050 return __acpi_os_execute(type, function, context, 0);
1052 EXPORT_SYMBOL(acpi_os_execute);
1054 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1055 void *context)
1057 return __acpi_os_execute(0, function, context, 1);
1060 void acpi_os_wait_events_complete(void *context)
1062 flush_workqueue(kacpid_wq);
1063 flush_workqueue(kacpi_notify_wq);
1066 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1068 acpi_status
1069 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1071 struct semaphore *sem = NULL;
1073 sem = acpi_os_allocate(sizeof(struct semaphore));
1074 if (!sem)
1075 return AE_NO_MEMORY;
1076 memset(sem, 0, sizeof(struct semaphore));
1078 sema_init(sem, initial_units);
1080 *handle = (acpi_handle *) sem;
1082 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1083 *handle, initial_units));
1085 return AE_OK;
1089 * TODO: A better way to delete semaphores? Linux doesn't have a
1090 * 'delete_semaphore()' function -- may result in an invalid
1091 * pointer dereference for non-synchronized consumers. Should
1092 * we at least check for blocked threads and signal/cancel them?
1095 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1097 struct semaphore *sem = (struct semaphore *)handle;
1099 if (!sem)
1100 return AE_BAD_PARAMETER;
1102 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1104 BUG_ON(!list_empty(&sem->wait_list));
1105 kfree(sem);
1106 sem = NULL;
1108 return AE_OK;
1112 * TODO: Support for units > 1?
1114 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1116 acpi_status status = AE_OK;
1117 struct semaphore *sem = (struct semaphore *)handle;
1118 long jiffies;
1119 int ret = 0;
1121 if (!sem || (units < 1))
1122 return AE_BAD_PARAMETER;
1124 if (units > 1)
1125 return AE_SUPPORT;
1127 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1128 handle, units, timeout));
1130 if (timeout == ACPI_WAIT_FOREVER)
1131 jiffies = MAX_SCHEDULE_TIMEOUT;
1132 else
1133 jiffies = msecs_to_jiffies(timeout);
1135 ret = down_timeout(sem, jiffies);
1136 if (ret)
1137 status = AE_TIME;
1139 if (ACPI_FAILURE(status)) {
1140 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1141 "Failed to acquire semaphore[%p|%d|%d], %s",
1142 handle, units, timeout,
1143 acpi_format_exception(status)));
1144 } else {
1145 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1146 "Acquired semaphore[%p|%d|%d]", handle,
1147 units, timeout));
1150 return status;
1154 * TODO: Support for units > 1?
1156 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1158 struct semaphore *sem = (struct semaphore *)handle;
1160 if (!sem || (units < 1))
1161 return AE_BAD_PARAMETER;
1163 if (units > 1)
1164 return AE_SUPPORT;
1166 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1167 units));
1169 up(sem);
1171 return AE_OK;
1174 #ifdef ACPI_FUTURE_USAGE
1175 u32 acpi_os_get_line(char *buffer)
1178 #ifdef ENABLE_DEBUGGER
1179 if (acpi_in_debugger) {
1180 u32 chars;
1182 kdb_read(buffer, sizeof(line_buf));
1184 /* remove the CR kdb includes */
1185 chars = strlen(buffer) - 1;
1186 buffer[chars] = '\0';
1188 #endif
1190 return 0;
1192 #endif /* ACPI_FUTURE_USAGE */
1194 acpi_status acpi_os_signal(u32 function, void *info)
1196 switch (function) {
1197 case ACPI_SIGNAL_FATAL:
1198 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1199 break;
1200 case ACPI_SIGNAL_BREAKPOINT:
1202 * AML Breakpoint
1203 * ACPI spec. says to treat it as a NOP unless
1204 * you are debugging. So if/when we integrate
1205 * AML debugger into the kernel debugger its
1206 * hook will go here. But until then it is
1207 * not useful to print anything on breakpoints.
1209 break;
1210 default:
1211 break;
1214 return AE_OK;
1217 static int __init acpi_os_name_setup(char *str)
1219 char *p = acpi_os_name;
1220 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1222 if (!str || !*str)
1223 return 0;
1225 for (; count-- && str && *str; str++) {
1226 if (isalnum(*str) || *str == ' ' || *str == ':')
1227 *p++ = *str;
1228 else if (*str == '\'' || *str == '"')
1229 continue;
1230 else
1231 break;
1233 *p = 0;
1235 return 1;
1239 __setup("acpi_os_name=", acpi_os_name_setup);
1241 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1242 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1244 struct osi_setup_entry {
1245 char string[OSI_STRING_LENGTH_MAX];
1246 bool enable;
1249 static struct osi_setup_entry __initdata
1250 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1251 {"Module Device", true},
1252 {"Processor Device", true},
1253 {"3.0 _SCP Extensions", true},
1254 {"Processor Aggregator Device", true},
1257 void __init acpi_osi_setup(char *str)
1259 struct osi_setup_entry *osi;
1260 bool enable = true;
1261 int i;
1263 if (!acpi_gbl_create_osi_method)
1264 return;
1266 if (str == NULL || *str == '\0') {
1267 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1268 acpi_gbl_create_osi_method = FALSE;
1269 return;
1272 if (*str == '!') {
1273 str++;
1274 enable = false;
1277 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1278 osi = &osi_setup_entries[i];
1279 if (!strcmp(osi->string, str)) {
1280 osi->enable = enable;
1281 break;
1282 } else if (osi->string[0] == '\0') {
1283 osi->enable = enable;
1284 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1285 break;
1290 static void __init set_osi_linux(unsigned int enable)
1292 if (osi_linux.enable != enable)
1293 osi_linux.enable = enable;
1295 if (osi_linux.enable)
1296 acpi_osi_setup("Linux");
1297 else
1298 acpi_osi_setup("!Linux");
1300 return;
1303 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1305 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1306 osi_linux.dmi = 0;
1307 set_osi_linux(enable);
1309 return;
1312 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1314 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1316 if (enable == -1)
1317 return;
1319 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1320 set_osi_linux(enable);
1322 return;
1326 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1328 * empty string disables _OSI
1329 * string starting with '!' disables that string
1330 * otherwise string is added to list, augmenting built-in strings
1332 static void __init acpi_osi_setup_late(void)
1334 struct osi_setup_entry *osi;
1335 char *str;
1336 int i;
1337 acpi_status status;
1339 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1340 osi = &osi_setup_entries[i];
1341 str = osi->string;
1343 if (*str == '\0')
1344 break;
1345 if (osi->enable) {
1346 status = acpi_install_interface(str);
1348 if (ACPI_SUCCESS(status))
1349 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1350 } else {
1351 status = acpi_remove_interface(str);
1353 if (ACPI_SUCCESS(status))
1354 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1359 static int __init osi_setup(char *str)
1361 if (str && !strcmp("Linux", str))
1362 acpi_cmdline_osi_linux(1);
1363 else if (str && !strcmp("!Linux", str))
1364 acpi_cmdline_osi_linux(0);
1365 else
1366 acpi_osi_setup(str);
1368 return 1;
1371 __setup("acpi_osi=", osi_setup);
1373 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1374 static int __init acpi_serialize_setup(char *str)
1376 printk(KERN_INFO PREFIX "serialize enabled\n");
1378 acpi_gbl_all_methods_serialized = TRUE;
1380 return 1;
1383 __setup("acpi_serialize", acpi_serialize_setup);
1385 /* Check of resource interference between native drivers and ACPI
1386 * OperationRegions (SystemIO and System Memory only).
1387 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1388 * in arbitrary AML code and can interfere with legacy drivers.
1389 * acpi_enforce_resources= can be set to:
1391 * - strict (default) (2)
1392 * -> further driver trying to access the resources will not load
1393 * - lax (1)
1394 * -> further driver trying to access the resources will load, but you
1395 * get a system message that something might go wrong...
1397 * - no (0)
1398 * -> ACPI Operation Region resources will not be registered
1401 #define ENFORCE_RESOURCES_STRICT 2
1402 #define ENFORCE_RESOURCES_LAX 1
1403 #define ENFORCE_RESOURCES_NO 0
1405 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1407 static int __init acpi_enforce_resources_setup(char *str)
1409 if (str == NULL || *str == '\0')
1410 return 0;
1412 if (!strcmp("strict", str))
1413 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1414 else if (!strcmp("lax", str))
1415 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1416 else if (!strcmp("no", str))
1417 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1419 return 1;
1422 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1424 /* Check for resource conflicts between ACPI OperationRegions and native
1425 * drivers */
1426 int acpi_check_resource_conflict(const struct resource *res)
1428 acpi_adr_space_type space_id;
1429 acpi_size length;
1430 u8 warn = 0;
1431 int clash = 0;
1433 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1434 return 0;
1435 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1436 return 0;
1438 if (res->flags & IORESOURCE_IO)
1439 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1440 else
1441 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1443 length = res->end - res->start + 1;
1444 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1445 warn = 1;
1446 clash = acpi_check_address_range(space_id, res->start, length, warn);
1448 if (clash) {
1449 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1450 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1451 printk(KERN_NOTICE "ACPI: This conflict may"
1452 " cause random problems and system"
1453 " instability\n");
1454 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1455 " for this device, you should use it instead of"
1456 " the native driver\n");
1458 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1459 return -EBUSY;
1461 return 0;
1463 EXPORT_SYMBOL(acpi_check_resource_conflict);
1465 int acpi_check_region(resource_size_t start, resource_size_t n,
1466 const char *name)
1468 struct resource res = {
1469 .start = start,
1470 .end = start + n - 1,
1471 .name = name,
1472 .flags = IORESOURCE_IO,
1475 return acpi_check_resource_conflict(&res);
1477 EXPORT_SYMBOL(acpi_check_region);
1480 * Let drivers know whether the resource checks are effective
1482 int acpi_resources_are_enforced(void)
1484 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1486 EXPORT_SYMBOL(acpi_resources_are_enforced);
1489 * Deallocate the memory for a spinlock.
1491 void acpi_os_delete_lock(acpi_spinlock handle)
1493 ACPI_FREE(handle);
1497 * Acquire a spinlock.
1499 * handle is a pointer to the spinlock_t.
1502 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1504 acpi_cpu_flags flags;
1505 spin_lock_irqsave(lockp, flags);
1506 return flags;
1510 * Release a spinlock. See above.
1513 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1515 spin_unlock_irqrestore(lockp, flags);
1518 #ifndef ACPI_USE_LOCAL_CACHE
1520 /*******************************************************************************
1522 * FUNCTION: acpi_os_create_cache
1524 * PARAMETERS: name - Ascii name for the cache
1525 * size - Size of each cached object
1526 * depth - Maximum depth of the cache (in objects) <ignored>
1527 * cache - Where the new cache object is returned
1529 * RETURN: status
1531 * DESCRIPTION: Create a cache object
1533 ******************************************************************************/
1535 acpi_status
1536 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1538 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1539 if (*cache == NULL)
1540 return AE_ERROR;
1541 else
1542 return AE_OK;
1545 /*******************************************************************************
1547 * FUNCTION: acpi_os_purge_cache
1549 * PARAMETERS: Cache - Handle to cache object
1551 * RETURN: Status
1553 * DESCRIPTION: Free all objects within the requested cache.
1555 ******************************************************************************/
1557 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1559 kmem_cache_shrink(cache);
1560 return (AE_OK);
1563 /*******************************************************************************
1565 * FUNCTION: acpi_os_delete_cache
1567 * PARAMETERS: Cache - Handle to cache object
1569 * RETURN: Status
1571 * DESCRIPTION: Free all objects within the requested cache and delete the
1572 * cache object.
1574 ******************************************************************************/
1576 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1578 kmem_cache_destroy(cache);
1579 return (AE_OK);
1582 /*******************************************************************************
1584 * FUNCTION: acpi_os_release_object
1586 * PARAMETERS: Cache - Handle to cache object
1587 * Object - The object to be released
1589 * RETURN: None
1591 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1592 * the object is deleted.
1594 ******************************************************************************/
1596 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1598 kmem_cache_free(cache, object);
1599 return (AE_OK);
1601 #endif
1603 acpi_status __init acpi_os_initialize(void)
1605 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1606 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1607 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1608 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1610 return AE_OK;
1613 acpi_status __init acpi_os_initialize1(void)
1615 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1616 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1617 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1618 BUG_ON(!kacpid_wq);
1619 BUG_ON(!kacpi_notify_wq);
1620 BUG_ON(!kacpi_hotplug_wq);
1621 acpi_install_interface_handler(acpi_osi_handler);
1622 acpi_osi_setup_late();
1623 return AE_OK;
1626 acpi_status acpi_os_terminate(void)
1628 if (acpi_irq_handler) {
1629 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1630 acpi_irq_handler);
1633 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1634 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1635 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1636 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1638 destroy_workqueue(kacpid_wq);
1639 destroy_workqueue(kacpi_notify_wq);
1640 destroy_workqueue(kacpi_hotplug_wq);
1642 return AE_OK;