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 static struct workqueue_struct *kacpi_hotplug_wq;
90 * This list of permanent mappings is for memory that may be accessed from
91 * interrupt context, where we can't do the ioremap().
94 struct list_head list;
96 acpi_physical_address phys;
98 unsigned long refcount;
101 static LIST_HEAD(acpi_ioremaps);
102 static DEFINE_MUTEX(acpi_ioremap_lock);
104 static void __init acpi_osi_setup_late(void);
107 * The story of _OSI(Linux)
109 * From pre-history through Linux-2.6.22,
110 * Linux responded TRUE upon a BIOS OSI(Linux) query.
112 * Unfortunately, reference BIOS writers got wind of this
113 * and put OSI(Linux) in their example code, quickly exposing
114 * this string as ill-conceived and opening the door to
115 * an un-bounded number of BIOS incompatibilities.
117 * For example, OSI(Linux) was used on resume to re-POST a
118 * video card on one system, because Linux at that time
119 * could not do a speedy restore in its native driver.
120 * But then upon gaining quick native restore capability,
121 * Linux has no way to tell the BIOS to skip the time-consuming
122 * POST -- putting Linux at a permanent performance disadvantage.
123 * On another system, the BIOS writer used OSI(Linux)
124 * to infer native OS support for IPMI! On other systems,
125 * OSI(Linux) simply got in the way of Linux claiming to
126 * be compatible with other operating systems, exposing
127 * BIOS issues such as skipped device initialization.
129 * So "Linux" turned out to be a really poor chose of
130 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132 * BIOS writers should NOT query _OSI(Linux) on future systems.
133 * Linux will complain on the console when it sees it, and return FALSE.
134 * To get Linux to return TRUE for your system will require
135 * a kernel source update to add a DMI entry,
136 * or boot with "acpi_osi=Linux"
139 static struct osi_linux {
140 unsigned int enable:1;
142 unsigned int cmdline:1;
143 } osi_linux = {0, 0, 0};
145 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147 if (!strcmp("Linux", interface)) {
149 printk_once(KERN_NOTICE FW_BUG PREFIX
150 "BIOS _OSI(Linux) query %s%s\n",
151 osi_linux.enable ? "honored" : "ignored",
152 osi_linux.cmdline ? " via cmdline" :
153 osi_linux.dmi ? " via DMI" : "");
159 static void __init acpi_request_region (struct acpi_generic_address *gas,
160 unsigned int length, char *desc)
164 /* Handle possible alignment issues */
165 memcpy(&addr, &gas->address, sizeof(addr));
166 if (!addr || !length)
169 /* Resources are never freed */
170 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
171 request_region(addr, length, desc);
172 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
173 request_mem_region(addr, length, desc);
176 static void __init acpi_reserve_resources(void)
178 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
179 "ACPI PM1a_EVT_BLK");
181 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
182 "ACPI PM1b_EVT_BLK");
184 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
185 "ACPI PM1a_CNT_BLK");
187 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
188 "ACPI PM1b_CNT_BLK");
190 if (acpi_gbl_FADT.pm_timer_length == 4)
191 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
196 /* Length of GPE blocks must be a non-negative multiple of 2 */
198 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
199 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
200 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
203 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
204 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
207 void acpi_os_printf(const char *fmt, ...)
211 acpi_os_vprintf(fmt, args);
215 void acpi_os_vprintf(const char *fmt, va_list args)
217 static char buffer[512];
219 vsprintf(buffer, fmt, args);
221 #ifdef ENABLE_DEBUGGER
222 if (acpi_in_debugger) {
223 kdb_printf("%s", buffer);
225 printk(KERN_CONT "%s", buffer);
228 printk(KERN_CONT "%s", buffer);
233 static unsigned long acpi_rsdp;
234 static int __init setup_acpi_rsdp(char *arg)
236 acpi_rsdp = simple_strtoul(arg, NULL, 16);
239 early_param("acpi_rsdp", setup_acpi_rsdp);
242 acpi_physical_address __init acpi_os_get_root_pointer(void)
249 if (efi_enabled(EFI_CONFIG_TABLES)) {
250 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
252 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
255 printk(KERN_ERR PREFIX
256 "System description tables not found\n");
260 acpi_physical_address pa = 0;
262 acpi_find_root_pointer(&pa);
267 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
268 static struct acpi_ioremap *
269 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
271 struct acpi_ioremap *map;
273 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
274 if (map->phys <= phys &&
275 phys + size <= map->phys + map->size)
281 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
282 static void __iomem *
283 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
285 struct acpi_ioremap *map;
287 map = acpi_map_lookup(phys, size);
289 return map->virt + (phys - map->phys);
294 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
296 struct acpi_ioremap *map;
297 void __iomem *virt = NULL;
299 mutex_lock(&acpi_ioremap_lock);
300 map = acpi_map_lookup(phys, size);
302 virt = map->virt + (phys - map->phys);
305 mutex_unlock(&acpi_ioremap_lock);
308 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
310 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
311 static struct acpi_ioremap *
312 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
314 struct acpi_ioremap *map;
316 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
317 if (map->virt <= virt &&
318 virt + size <= map->virt + map->size)
325 #define should_use_kmap(pfn) page_is_ram(pfn)
327 /* ioremap will take care of cache attributes */
328 #define should_use_kmap(pfn) 0
331 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
335 pfn = pg_off >> PAGE_SHIFT;
336 if (should_use_kmap(pfn)) {
337 if (pg_sz > PAGE_SIZE)
339 return (void __iomem __force *)kmap(pfn_to_page(pfn));
341 return acpi_os_ioremap(pg_off, pg_sz);
344 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
348 pfn = pg_off >> PAGE_SHIFT;
349 if (should_use_kmap(pfn))
350 kunmap(pfn_to_page(pfn));
355 void __iomem *__init_refok
356 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
358 struct acpi_ioremap *map;
360 acpi_physical_address pg_off;
363 if (phys > ULONG_MAX) {
364 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
368 if (!acpi_gbl_permanent_mmap)
369 return __acpi_map_table((unsigned long)phys, size);
371 mutex_lock(&acpi_ioremap_lock);
372 /* Check if there's a suitable mapping already. */
373 map = acpi_map_lookup(phys, size);
379 map = kzalloc(sizeof(*map), GFP_KERNEL);
381 mutex_unlock(&acpi_ioremap_lock);
385 pg_off = round_down(phys, PAGE_SIZE);
386 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
387 virt = acpi_map(pg_off, pg_sz);
389 mutex_unlock(&acpi_ioremap_lock);
394 INIT_LIST_HEAD(&map->list);
400 list_add_tail_rcu(&map->list, &acpi_ioremaps);
403 mutex_unlock(&acpi_ioremap_lock);
404 return map->virt + (phys - map->phys);
406 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
408 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
410 if (!--map->refcount)
411 list_del_rcu(&map->list);
414 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
416 if (!map->refcount) {
418 acpi_unmap(map->phys, map->virt);
423 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
425 struct acpi_ioremap *map;
427 if (!acpi_gbl_permanent_mmap) {
428 __acpi_unmap_table(virt, size);
432 mutex_lock(&acpi_ioremap_lock);
433 map = acpi_map_lookup_virt(virt, size);
435 mutex_unlock(&acpi_ioremap_lock);
436 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
439 acpi_os_drop_map_ref(map);
440 mutex_unlock(&acpi_ioremap_lock);
442 acpi_os_map_cleanup(map);
444 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
446 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
448 if (!acpi_gbl_permanent_mmap)
449 __acpi_unmap_table(virt, size);
452 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
460 /* Handle possible alignment issues */
461 memcpy(&addr, &gas->address, sizeof(addr));
462 if (!addr || !gas->bit_width)
465 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
471 EXPORT_SYMBOL(acpi_os_map_generic_address);
473 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
476 struct acpi_ioremap *map;
478 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
481 /* Handle possible alignment issues */
482 memcpy(&addr, &gas->address, sizeof(addr));
483 if (!addr || !gas->bit_width)
486 mutex_lock(&acpi_ioremap_lock);
487 map = acpi_map_lookup(addr, gas->bit_width / 8);
489 mutex_unlock(&acpi_ioremap_lock);
492 acpi_os_drop_map_ref(map);
493 mutex_unlock(&acpi_ioremap_lock);
495 acpi_os_map_cleanup(map);
497 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
499 #ifdef ACPI_FUTURE_USAGE
501 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
504 return AE_BAD_PARAMETER;
506 *phys = virt_to_phys(virt);
512 #define ACPI_MAX_OVERRIDE_LEN 100
514 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
517 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
518 acpi_string * new_val)
520 if (!init_val || !new_val)
521 return AE_BAD_PARAMETER;
524 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
525 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
527 *new_val = acpi_os_name;
533 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
534 #include <linux/earlycpio.h>
535 #include <linux/memblock.h>
537 static u64 acpi_tables_addr;
538 static int all_tables_size;
540 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
541 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
544 u8 *end = buffer + length;
547 sum = (u8) (sum + *(buffer++));
551 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
552 static const char * const table_sigs[] = {
553 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
554 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
555 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
556 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
557 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
558 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
559 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
560 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
561 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
563 /* Non-fatal errors: Affected tables/files are ignored */
564 #define INVALID_TABLE(x, path, name) \
565 { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
567 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
569 /* Must not increase 10 or needs code modification below */
570 #define ACPI_OVERRIDE_TABLES 10
572 void __init acpi_initrd_override(void *data, size_t size)
574 int sig, no, table_nr = 0, total_offset = 0;
576 struct acpi_table_header *table;
577 char cpio_path[32] = "kernel/firmware/acpi/";
578 struct cpio_data file;
579 struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
582 if (data == NULL || size == 0)
585 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
586 file = find_cpio_data(cpio_path, data, size, &offset);
593 if (file.size < sizeof(struct acpi_table_header))
594 INVALID_TABLE("Table smaller than ACPI header",
595 cpio_path, file.name);
599 for (sig = 0; table_sigs[sig]; sig++)
600 if (!memcmp(table->signature, table_sigs[sig], 4))
603 if (!table_sigs[sig])
604 INVALID_TABLE("Unknown signature",
605 cpio_path, file.name);
606 if (file.size != table->length)
607 INVALID_TABLE("File length does not match table length",
608 cpio_path, file.name);
609 if (acpi_table_checksum(file.data, table->length))
610 INVALID_TABLE("Bad table checksum",
611 cpio_path, file.name);
613 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
614 table->signature, cpio_path, file.name, table->length);
616 all_tables_size += table->length;
617 early_initrd_files[table_nr].data = file.data;
618 early_initrd_files[table_nr].size = file.size;
625 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
626 all_tables_size, PAGE_SIZE);
627 if (!acpi_tables_addr) {
632 * Only calling e820_add_reserve does not work and the
633 * tables are invalid (memory got used) later.
634 * memblock_reserve works as expected and the tables won't get modified.
635 * But it's not enough on X86 because ioremap will
636 * complain later (used by acpi_os_map_memory) that the pages
637 * that should get mapped are not marked "reserved".
638 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
641 memblock_reserve(acpi_tables_addr, all_tables_size);
642 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
644 p = early_ioremap(acpi_tables_addr, all_tables_size);
646 for (no = 0; no < table_nr; no++) {
647 memcpy(p + total_offset, early_initrd_files[no].data,
648 early_initrd_files[no].size);
649 total_offset += early_initrd_files[no].size;
651 early_iounmap(p, all_tables_size);
653 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
655 static void acpi_table_taint(struct acpi_table_header *table)
658 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
659 table->signature, table->oem_table_id);
660 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
665 acpi_os_table_override(struct acpi_table_header * existing_table,
666 struct acpi_table_header ** new_table)
668 if (!existing_table || !new_table)
669 return AE_BAD_PARAMETER;
673 #ifdef CONFIG_ACPI_CUSTOM_DSDT
674 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
675 *new_table = (struct acpi_table_header *)AmlCode;
677 if (*new_table != NULL)
678 acpi_table_taint(existing_table);
683 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
684 acpi_physical_address *address,
687 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
692 int table_offset = 0;
693 struct acpi_table_header *table;
698 if (!acpi_tables_addr)
702 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
707 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
710 if (table_offset + table->length > all_tables_size) {
711 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
716 table_offset += table->length;
718 if (memcmp(existing_table->signature, table->signature, 4)) {
719 acpi_os_unmap_memory(table,
724 /* Only override tables with matching oem id */
725 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
726 ACPI_OEM_TABLE_ID_SIZE)) {
727 acpi_os_unmap_memory(table,
732 table_offset -= table->length;
733 *table_length = table->length;
734 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
735 *address = acpi_tables_addr + table_offset;
737 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
740 acpi_table_taint(existing_table);
745 static irqreturn_t acpi_irq(int irq, void *dev_id)
749 handled = (*acpi_irq_handler) (acpi_irq_context);
755 acpi_irq_not_handled++;
761 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
766 acpi_irq_stats_init();
769 * ACPI interrupts different from the SCI in our copy of the FADT are
772 if (gsi != acpi_gbl_FADT.sci_interrupt)
773 return AE_BAD_PARAMETER;
775 if (acpi_irq_handler)
776 return AE_ALREADY_ACQUIRED;
778 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
779 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
784 acpi_irq_handler = handler;
785 acpi_irq_context = context;
786 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
787 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
788 acpi_irq_handler = NULL;
789 return AE_NOT_ACQUIRED;
795 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
797 if (irq != acpi_gbl_FADT.sci_interrupt)
798 return AE_BAD_PARAMETER;
800 free_irq(irq, acpi_irq);
801 acpi_irq_handler = NULL;
807 * Running in interpreter thread context, safe to sleep
810 void acpi_os_sleep(u64 ms)
812 schedule_timeout_interruptible(msecs_to_jiffies(ms));
815 void acpi_os_stall(u32 us)
823 touch_nmi_watchdog();
829 * Support ACPI 3.0 AML Timer operand
830 * Returns 64-bit free-running, monotonically increasing timer
831 * with 100ns granularity
833 u64 acpi_os_get_timer(void)
838 /* TBD: use HPET if available */
841 #ifdef CONFIG_X86_PM_TIMER
842 /* TBD: default to PM timer if HPET was not available */
845 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
850 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
859 *(u8 *) value = inb(port);
860 } else if (width <= 16) {
861 *(u16 *) value = inw(port);
862 } else if (width <= 32) {
863 *(u32 *) value = inl(port);
871 EXPORT_SYMBOL(acpi_os_read_port);
873 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
877 } else if (width <= 16) {
879 } else if (width <= 32) {
888 EXPORT_SYMBOL(acpi_os_write_port);
891 static inline u64 read64(const volatile void __iomem *addr)
896 static inline u64 read64(const volatile void __iomem *addr)
901 return l | (h << 32);
906 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
908 void __iomem *virt_addr;
909 unsigned int size = width / 8;
914 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
917 virt_addr = acpi_os_ioremap(phys_addr, size);
919 return AE_BAD_ADDRESS;
928 *(u8 *) value = readb(virt_addr);
931 *(u16 *) value = readw(virt_addr);
934 *(u32 *) value = readl(virt_addr);
937 *(u64 *) value = read64(virt_addr);
952 static inline void write64(u64 val, volatile void __iomem *addr)
957 static inline void write64(u64 val, volatile void __iomem *addr)
960 writel(val>>32, addr+4);
965 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
967 void __iomem *virt_addr;
968 unsigned int size = width / 8;
972 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
975 virt_addr = acpi_os_ioremap(phys_addr, size);
977 return AE_BAD_ADDRESS;
983 writeb(value, virt_addr);
986 writew(value, virt_addr);
989 writel(value, virt_addr);
992 write64(value, virt_addr);
1007 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1008 u64 *value, u32 width)
1014 return AE_BAD_PARAMETER;
1030 result = raw_pci_read(pci_id->segment, pci_id->bus,
1031 PCI_DEVFN(pci_id->device, pci_id->function),
1032 reg, size, &value32);
1035 return (result ? AE_ERROR : AE_OK);
1039 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1040 u64 value, u32 width)
1058 result = raw_pci_write(pci_id->segment, pci_id->bus,
1059 PCI_DEVFN(pci_id->device, pci_id->function),
1062 return (result ? AE_ERROR : AE_OK);
1065 static void acpi_os_execute_deferred(struct work_struct *work)
1067 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1070 acpi_os_wait_events_complete();
1072 dpc->function(dpc->context);
1076 /*******************************************************************************
1078 * FUNCTION: acpi_os_execute
1080 * PARAMETERS: Type - Type of the callback
1081 * Function - Function to be executed
1082 * Context - Function parameters
1086 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1087 * immediately executes function on a separate thread.
1089 ******************************************************************************/
1091 static acpi_status __acpi_os_execute(acpi_execute_type type,
1092 acpi_osd_exec_callback function, void *context, int hp)
1094 acpi_status status = AE_OK;
1095 struct acpi_os_dpc *dpc;
1096 struct workqueue_struct *queue;
1098 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1099 "Scheduling function [%p(%p)] for deferred execution.\n",
1100 function, context));
1103 * Allocate/initialize DPC structure. Note that this memory will be
1104 * freed by the callee. The kernel handles the work_struct list in a
1105 * way that allows us to also free its memory inside the callee.
1106 * Because we may want to schedule several tasks with different
1107 * parameters we can't use the approach some kernel code uses of
1108 * having a static work_struct.
1111 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1113 return AE_NO_MEMORY;
1115 dpc->function = function;
1116 dpc->context = context;
1119 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1120 * because the hotplug code may call driver .remove() functions,
1121 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1122 * to flush these workqueues.
1124 * To prevent lockdep from complaining unnecessarily, make sure that
1125 * there is a different static lockdep key for each workqueue by using
1126 * INIT_WORK() for each of them separately.
1129 queue = kacpi_hotplug_wq;
1131 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1132 } else if (type == OSL_NOTIFY_HANDLER) {
1133 queue = kacpi_notify_wq;
1134 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1137 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1141 * On some machines, a software-initiated SMI causes corruption unless
1142 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1143 * typically it's done in GPE-related methods that are run via
1144 * workqueues, so we can avoid the known corruption cases by always
1145 * queueing on CPU 0.
1147 ret = queue_work_on(0, queue, &dpc->work);
1150 printk(KERN_ERR PREFIX
1151 "Call to queue_work() failed.\n");
1158 acpi_status acpi_os_execute(acpi_execute_type type,
1159 acpi_osd_exec_callback function, void *context)
1161 return __acpi_os_execute(type, function, context, 0);
1163 EXPORT_SYMBOL(acpi_os_execute);
1165 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1168 return __acpi_os_execute(0, function, context, 1);
1170 EXPORT_SYMBOL(acpi_os_hotplug_execute);
1172 void acpi_os_wait_events_complete(void)
1174 flush_workqueue(kacpid_wq);
1175 flush_workqueue(kacpi_notify_wq);
1178 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1181 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1183 struct semaphore *sem = NULL;
1185 sem = acpi_os_allocate(sizeof(struct semaphore));
1187 return AE_NO_MEMORY;
1188 memset(sem, 0, sizeof(struct semaphore));
1190 sema_init(sem, initial_units);
1192 *handle = (acpi_handle *) sem;
1194 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1195 *handle, initial_units));
1201 * TODO: A better way to delete semaphores? Linux doesn't have a
1202 * 'delete_semaphore()' function -- may result in an invalid
1203 * pointer dereference for non-synchronized consumers. Should
1204 * we at least check for blocked threads and signal/cancel them?
1207 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1209 struct semaphore *sem = (struct semaphore *)handle;
1212 return AE_BAD_PARAMETER;
1214 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1216 BUG_ON(!list_empty(&sem->wait_list));
1224 * TODO: Support for units > 1?
1226 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1228 acpi_status status = AE_OK;
1229 struct semaphore *sem = (struct semaphore *)handle;
1233 if (!sem || (units < 1))
1234 return AE_BAD_PARAMETER;
1239 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1240 handle, units, timeout));
1242 if (timeout == ACPI_WAIT_FOREVER)
1243 jiffies = MAX_SCHEDULE_TIMEOUT;
1245 jiffies = msecs_to_jiffies(timeout);
1247 ret = down_timeout(sem, jiffies);
1251 if (ACPI_FAILURE(status)) {
1252 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1253 "Failed to acquire semaphore[%p|%d|%d], %s",
1254 handle, units, timeout,
1255 acpi_format_exception(status)));
1257 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1258 "Acquired semaphore[%p|%d|%d]", handle,
1266 * TODO: Support for units > 1?
1268 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1270 struct semaphore *sem = (struct semaphore *)handle;
1272 if (!sem || (units < 1))
1273 return AE_BAD_PARAMETER;
1278 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1286 #ifdef ACPI_FUTURE_USAGE
1287 u32 acpi_os_get_line(char *buffer)
1290 #ifdef ENABLE_DEBUGGER
1291 if (acpi_in_debugger) {
1294 kdb_read(buffer, sizeof(line_buf));
1296 /* remove the CR kdb includes */
1297 chars = strlen(buffer) - 1;
1298 buffer[chars] = '\0';
1304 #endif /* ACPI_FUTURE_USAGE */
1306 acpi_status acpi_os_signal(u32 function, void *info)
1309 case ACPI_SIGNAL_FATAL:
1310 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1312 case ACPI_SIGNAL_BREAKPOINT:
1315 * ACPI spec. says to treat it as a NOP unless
1316 * you are debugging. So if/when we integrate
1317 * AML debugger into the kernel debugger its
1318 * hook will go here. But until then it is
1319 * not useful to print anything on breakpoints.
1329 static int __init acpi_os_name_setup(char *str)
1331 char *p = acpi_os_name;
1332 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1337 for (; count-- && str && *str; str++) {
1338 if (isalnum(*str) || *str == ' ' || *str == ':')
1340 else if (*str == '\'' || *str == '"')
1351 __setup("acpi_os_name=", acpi_os_name_setup);
1353 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1354 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1356 struct osi_setup_entry {
1357 char string[OSI_STRING_LENGTH_MAX];
1361 static struct osi_setup_entry __initdata
1362 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1363 {"Module Device", true},
1364 {"Processor Device", true},
1365 {"3.0 _SCP Extensions", true},
1366 {"Processor Aggregator Device", true},
1369 void __init acpi_osi_setup(char *str)
1371 struct osi_setup_entry *osi;
1375 if (!acpi_gbl_create_osi_method)
1378 if (str == NULL || *str == '\0') {
1379 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1380 acpi_gbl_create_osi_method = FALSE;
1389 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1390 osi = &osi_setup_entries[i];
1391 if (!strcmp(osi->string, str)) {
1392 osi->enable = enable;
1394 } else if (osi->string[0] == '\0') {
1395 osi->enable = enable;
1396 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1402 static void __init set_osi_linux(unsigned int enable)
1404 if (osi_linux.enable != enable)
1405 osi_linux.enable = enable;
1407 if (osi_linux.enable)
1408 acpi_osi_setup("Linux");
1410 acpi_osi_setup("!Linux");
1415 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1417 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1419 set_osi_linux(enable);
1424 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1426 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1431 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1432 set_osi_linux(enable);
1438 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1440 * empty string disables _OSI
1441 * string starting with '!' disables that string
1442 * otherwise string is added to list, augmenting built-in strings
1444 static void __init acpi_osi_setup_late(void)
1446 struct osi_setup_entry *osi;
1451 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1452 osi = &osi_setup_entries[i];
1458 status = acpi_install_interface(str);
1460 if (ACPI_SUCCESS(status))
1461 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1463 status = acpi_remove_interface(str);
1465 if (ACPI_SUCCESS(status))
1466 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1471 static int __init osi_setup(char *str)
1473 if (str && !strcmp("Linux", str))
1474 acpi_cmdline_osi_linux(1);
1475 else if (str && !strcmp("!Linux", str))
1476 acpi_cmdline_osi_linux(0);
1478 acpi_osi_setup(str);
1483 __setup("acpi_osi=", osi_setup);
1485 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1486 static int __init acpi_serialize_setup(char *str)
1488 printk(KERN_INFO PREFIX "serialize enabled\n");
1490 acpi_gbl_all_methods_serialized = TRUE;
1495 __setup("acpi_serialize", acpi_serialize_setup);
1497 /* Check of resource interference between native drivers and ACPI
1498 * OperationRegions (SystemIO and System Memory only).
1499 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1500 * in arbitrary AML code and can interfere with legacy drivers.
1501 * acpi_enforce_resources= can be set to:
1503 * - strict (default) (2)
1504 * -> further driver trying to access the resources will not load
1506 * -> further driver trying to access the resources will load, but you
1507 * get a system message that something might go wrong...
1510 * -> ACPI Operation Region resources will not be registered
1513 #define ENFORCE_RESOURCES_STRICT 2
1514 #define ENFORCE_RESOURCES_LAX 1
1515 #define ENFORCE_RESOURCES_NO 0
1517 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1519 static int __init acpi_enforce_resources_setup(char *str)
1521 if (str == NULL || *str == '\0')
1524 if (!strcmp("strict", str))
1525 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1526 else if (!strcmp("lax", str))
1527 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1528 else if (!strcmp("no", str))
1529 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1534 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1536 /* Check for resource conflicts between ACPI OperationRegions and native
1538 int acpi_check_resource_conflict(const struct resource *res)
1540 acpi_adr_space_type space_id;
1545 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1547 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1550 if (res->flags & IORESOURCE_IO)
1551 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1553 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1555 length = resource_size(res);
1556 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1558 clash = acpi_check_address_range(space_id, res->start, length, warn);
1561 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1562 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1563 printk(KERN_NOTICE "ACPI: This conflict may"
1564 " cause random problems and system"
1566 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1567 " for this device, you should use it instead of"
1568 " the native driver\n");
1570 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1575 EXPORT_SYMBOL(acpi_check_resource_conflict);
1577 int acpi_check_region(resource_size_t start, resource_size_t n,
1580 struct resource res = {
1582 .end = start + n - 1,
1584 .flags = IORESOURCE_IO,
1587 return acpi_check_resource_conflict(&res);
1589 EXPORT_SYMBOL(acpi_check_region);
1592 * Let drivers know whether the resource checks are effective
1594 int acpi_resources_are_enforced(void)
1596 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1598 EXPORT_SYMBOL(acpi_resources_are_enforced);
1601 * Deallocate the memory for a spinlock.
1603 void acpi_os_delete_lock(acpi_spinlock handle)
1609 * Acquire a spinlock.
1611 * handle is a pointer to the spinlock_t.
1614 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1616 acpi_cpu_flags flags;
1617 spin_lock_irqsave(lockp, flags);
1622 * Release a spinlock. See above.
1625 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1627 spin_unlock_irqrestore(lockp, flags);
1630 #ifndef ACPI_USE_LOCAL_CACHE
1632 /*******************************************************************************
1634 * FUNCTION: acpi_os_create_cache
1636 * PARAMETERS: name - Ascii name for the cache
1637 * size - Size of each cached object
1638 * depth - Maximum depth of the cache (in objects) <ignored>
1639 * cache - Where the new cache object is returned
1643 * DESCRIPTION: Create a cache object
1645 ******************************************************************************/
1648 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1650 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1657 /*******************************************************************************
1659 * FUNCTION: acpi_os_purge_cache
1661 * PARAMETERS: Cache - Handle to cache object
1665 * DESCRIPTION: Free all objects within the requested cache.
1667 ******************************************************************************/
1669 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1671 kmem_cache_shrink(cache);
1675 /*******************************************************************************
1677 * FUNCTION: acpi_os_delete_cache
1679 * PARAMETERS: Cache - Handle to cache object
1683 * DESCRIPTION: Free all objects within the requested cache and delete the
1686 ******************************************************************************/
1688 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1690 kmem_cache_destroy(cache);
1694 /*******************************************************************************
1696 * FUNCTION: acpi_os_release_object
1698 * PARAMETERS: Cache - Handle to cache object
1699 * Object - The object to be released
1703 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1704 * the object is deleted.
1706 ******************************************************************************/
1708 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1710 kmem_cache_free(cache, object);
1715 acpi_status __init acpi_os_initialize(void)
1717 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1718 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1719 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1720 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1725 acpi_status __init acpi_os_initialize1(void)
1727 acpi_reserve_resources();
1728 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1729 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1730 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1732 BUG_ON(!kacpi_notify_wq);
1733 BUG_ON(!kacpi_hotplug_wq);
1734 acpi_install_interface_handler(acpi_osi_handler);
1735 acpi_osi_setup_late();
1739 acpi_status acpi_os_terminate(void)
1741 if (acpi_irq_handler) {
1742 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1746 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1747 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1748 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1749 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1751 destroy_workqueue(kacpid_wq);
1752 destroy_workqueue(kacpi_notify_wq);
1753 destroy_workqueue(kacpi_hotplug_wq);
1758 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1762 if (__acpi_os_prepare_sleep)
1763 rc = __acpi_os_prepare_sleep(sleep_state,
1764 pm1a_control, pm1b_control);
1768 return AE_CTRL_SKIP;
1773 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1774 u32 pm1a_ctrl, u32 pm1b_ctrl))
1776 __acpi_os_prepare_sleep = func;
1779 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
1780 void (*func)(struct work_struct *work))
1782 struct acpi_hp_work *hp_work;
1785 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1789 hp_work->handle = handle;
1790 hp_work->type = type;
1791 hp_work->context = context;
1793 INIT_WORK(&hp_work->work, func);
1794 ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1798 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work);