ACPI, APEI, GHES: Add PCIe AER recovery support
[linux-2.6.git] / drivers / acpi / osl.c
1 /*
2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3  *
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>
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
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.
16  *
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.
21  *
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
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  *
28  */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/pci.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.h>
40 #include <linux/acpi.h>
41 #include <linux/acpi_io.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
47
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
54
55 #define _COMPONENT              ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX          "ACPI: "
58 struct acpi_os_dpc {
59         acpi_osd_exec_callback function;
60         void *context;
61         struct work_struct work;
62         int wait;
63 };
64
65 #ifdef CONFIG_ACPI_CUSTOM_DSDT
66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
67 #endif
68
69 #ifdef ENABLE_DEBUGGER
70 #include <linux/kdb.h>
71
72 /* stuff for debugger support */
73 int acpi_in_debugger;
74 EXPORT_SYMBOL(acpi_in_debugger);
75
76 extern char line_buf[80];
77 #endif                          /*ENABLE_DEBUGGER */
78
79 static acpi_osd_handler acpi_irq_handler;
80 static void *acpi_irq_context;
81 static struct workqueue_struct *kacpid_wq;
82 static struct workqueue_struct *kacpi_notify_wq;
83 struct workqueue_struct *kacpi_hotplug_wq;
84 EXPORT_SYMBOL(kacpi_hotplug_wq);
85
86 struct acpi_res_list {
87         resource_size_t start;
88         resource_size_t end;
89         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
90         char name[5];   /* only can have a length of 4 chars, make use of this
91                            one instead of res->name, no need to kalloc then */
92         struct list_head resource_list;
93         int count;
94 };
95
96 static LIST_HEAD(resource_list_head);
97 static DEFINE_SPINLOCK(acpi_res_lock);
98
99 /*
100  * This list of permanent mappings is for memory that may be accessed from
101  * interrupt context, where we can't do the ioremap().
102  */
103 struct acpi_ioremap {
104         struct list_head list;
105         void __iomem *virt;
106         acpi_physical_address phys;
107         acpi_size size;
108         unsigned long refcount;
109 };
110
111 static LIST_HEAD(acpi_ioremaps);
112 static DEFINE_MUTEX(acpi_ioremap_lock);
113
114 static void __init acpi_osi_setup_late(void);
115
116 /*
117  * The story of _OSI(Linux)
118  *
119  * From pre-history through Linux-2.6.22,
120  * Linux responded TRUE upon a BIOS OSI(Linux) query.
121  *
122  * Unfortunately, reference BIOS writers got wind of this
123  * and put OSI(Linux) in their example code, quickly exposing
124  * this string as ill-conceived and opening the door to
125  * an un-bounded number of BIOS incompatibilities.
126  *
127  * For example, OSI(Linux) was used on resume to re-POST a
128  * video card on one system, because Linux at that time
129  * could not do a speedy restore in its native driver.
130  * But then upon gaining quick native restore capability,
131  * Linux has no way to tell the BIOS to skip the time-consuming
132  * POST -- putting Linux at a permanent performance disadvantage.
133  * On another system, the BIOS writer used OSI(Linux)
134  * to infer native OS support for IPMI!  On other systems,
135  * OSI(Linux) simply got in the way of Linux claiming to
136  * be compatible with other operating systems, exposing
137  * BIOS issues such as skipped device initialization.
138  *
139  * So "Linux" turned out to be a really poor chose of
140  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
141  *
142  * BIOS writers should NOT query _OSI(Linux) on future systems.
143  * Linux will complain on the console when it sees it, and return FALSE.
144  * To get Linux to return TRUE for your system  will require
145  * a kernel source update to add a DMI entry,
146  * or boot with "acpi_osi=Linux"
147  */
148
149 static struct osi_linux {
150         unsigned int    enable:1;
151         unsigned int    dmi:1;
152         unsigned int    cmdline:1;
153 } osi_linux = {0, 0, 0};
154
155 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
156 {
157         if (!strcmp("Linux", interface)) {
158
159                 printk_once(KERN_NOTICE FW_BUG PREFIX
160                         "BIOS _OSI(Linux) query %s%s\n",
161                         osi_linux.enable ? "honored" : "ignored",
162                         osi_linux.cmdline ? " via cmdline" :
163                         osi_linux.dmi ? " via DMI" : "");
164         }
165
166         return supported;
167 }
168
169 static void __init acpi_request_region (struct acpi_generic_address *addr,
170         unsigned int length, char *desc)
171 {
172         if (!addr->address || !length)
173                 return;
174
175         /* Resources are never freed */
176         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
177                 request_region(addr->address, length, desc);
178         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
179                 request_mem_region(addr->address, length, desc);
180 }
181
182 static int __init acpi_reserve_resources(void)
183 {
184         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
185                 "ACPI PM1a_EVT_BLK");
186
187         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
188                 "ACPI PM1b_EVT_BLK");
189
190         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
191                 "ACPI PM1a_CNT_BLK");
192
193         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
194                 "ACPI PM1b_CNT_BLK");
195
196         if (acpi_gbl_FADT.pm_timer_length == 4)
197                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
198
199         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
200                 "ACPI PM2_CNT_BLK");
201
202         /* Length of GPE blocks must be a non-negative multiple of 2 */
203
204         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
205                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
206                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
207
208         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
209                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
210                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
211
212         return 0;
213 }
214 device_initcall(acpi_reserve_resources);
215
216 void acpi_os_printf(const char *fmt, ...)
217 {
218         va_list args;
219         va_start(args, fmt);
220         acpi_os_vprintf(fmt, args);
221         va_end(args);
222 }
223
224 void acpi_os_vprintf(const char *fmt, va_list args)
225 {
226         static char buffer[512];
227
228         vsprintf(buffer, fmt, args);
229
230 #ifdef ENABLE_DEBUGGER
231         if (acpi_in_debugger) {
232                 kdb_printf("%s", buffer);
233         } else {
234                 printk(KERN_CONT "%s", buffer);
235         }
236 #else
237         printk(KERN_CONT "%s", buffer);
238 #endif
239 }
240
241 #ifdef CONFIG_KEXEC
242 static unsigned long acpi_rsdp;
243 static int __init setup_acpi_rsdp(char *arg)
244 {
245         acpi_rsdp = simple_strtoul(arg, NULL, 16);
246         return 0;
247 }
248 early_param("acpi_rsdp", setup_acpi_rsdp);
249 #endif
250
251 acpi_physical_address __init acpi_os_get_root_pointer(void)
252 {
253 #ifdef CONFIG_KEXEC
254         if (acpi_rsdp)
255                 return acpi_rsdp;
256 #endif
257
258         if (efi_enabled) {
259                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
260                         return efi.acpi20;
261                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
262                         return efi.acpi;
263                 else {
264                         printk(KERN_ERR PREFIX
265                                "System description tables not found\n");
266                         return 0;
267                 }
268         } else {
269                 acpi_physical_address pa = 0;
270
271                 acpi_find_root_pointer(&pa);
272                 return pa;
273         }
274 }
275
276 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
277 static struct acpi_ioremap *
278 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
279 {
280         struct acpi_ioremap *map;
281
282         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
283                 if (map->phys <= phys &&
284                     phys + size <= map->phys + map->size)
285                         return map;
286
287         return NULL;
288 }
289
290 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
291 static void __iomem *
292 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
293 {
294         struct acpi_ioremap *map;
295
296         map = acpi_map_lookup(phys, size);
297         if (map)
298                 return map->virt + (phys - map->phys);
299
300         return NULL;
301 }
302
303 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
304 {
305         struct acpi_ioremap *map;
306         void __iomem *virt = NULL;
307
308         mutex_lock(&acpi_ioremap_lock);
309         map = acpi_map_lookup(phys, size);
310         if (map) {
311                 virt = map->virt + (phys - map->phys);
312                 map->refcount++;
313         }
314         mutex_unlock(&acpi_ioremap_lock);
315         return virt;
316 }
317 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
318
319 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
320 static struct acpi_ioremap *
321 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
322 {
323         struct acpi_ioremap *map;
324
325         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
326                 if (map->virt <= virt &&
327                     virt + size <= map->virt + map->size)
328                         return map;
329
330         return NULL;
331 }
332
333 void __iomem *__init_refok
334 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
335 {
336         struct acpi_ioremap *map;
337         void __iomem *virt;
338         acpi_physical_address pg_off;
339         acpi_size pg_sz;
340
341         if (phys > ULONG_MAX) {
342                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
343                 return NULL;
344         }
345
346         if (!acpi_gbl_permanent_mmap)
347                 return __acpi_map_table((unsigned long)phys, size);
348
349         mutex_lock(&acpi_ioremap_lock);
350         /* Check if there's a suitable mapping already. */
351         map = acpi_map_lookup(phys, size);
352         if (map) {
353                 map->refcount++;
354                 goto out;
355         }
356
357         map = kzalloc(sizeof(*map), GFP_KERNEL);
358         if (!map) {
359                 mutex_unlock(&acpi_ioremap_lock);
360                 return NULL;
361         }
362
363         pg_off = round_down(phys, PAGE_SIZE);
364         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
365         virt = acpi_os_ioremap(pg_off, pg_sz);
366         if (!virt) {
367                 mutex_unlock(&acpi_ioremap_lock);
368                 kfree(map);
369                 return NULL;
370         }
371
372         INIT_LIST_HEAD(&map->list);
373         map->virt = virt;
374         map->phys = pg_off;
375         map->size = pg_sz;
376         map->refcount = 1;
377
378         list_add_tail_rcu(&map->list, &acpi_ioremaps);
379
380  out:
381         mutex_unlock(&acpi_ioremap_lock);
382         return map->virt + (phys - map->phys);
383 }
384 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
385
386 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
387 {
388         if (!--map->refcount)
389                 list_del_rcu(&map->list);
390 }
391
392 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
393 {
394         if (!map->refcount) {
395                 synchronize_rcu();
396                 iounmap(map->virt);
397                 kfree(map);
398         }
399 }
400
401 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
402 {
403         struct acpi_ioremap *map;
404
405         if (!acpi_gbl_permanent_mmap) {
406                 __acpi_unmap_table(virt, size);
407                 return;
408         }
409
410         mutex_lock(&acpi_ioremap_lock);
411         map = acpi_map_lookup_virt(virt, size);
412         if (!map) {
413                 mutex_unlock(&acpi_ioremap_lock);
414                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
415                 return;
416         }
417         acpi_os_drop_map_ref(map);
418         mutex_unlock(&acpi_ioremap_lock);
419
420         acpi_os_map_cleanup(map);
421 }
422 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
423
424 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
425 {
426         if (!acpi_gbl_permanent_mmap)
427                 __acpi_unmap_table(virt, size);
428 }
429
430 static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
431 {
432         void __iomem *virt;
433
434         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
435                 return 0;
436
437         if (!addr->address || !addr->bit_width)
438                 return -EINVAL;
439
440         virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
441         if (!virt)
442                 return -EIO;
443
444         return 0;
445 }
446
447 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
448 {
449         struct acpi_ioremap *map;
450
451         if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
452                 return;
453
454         if (!addr->address || !addr->bit_width)
455                 return;
456
457         mutex_lock(&acpi_ioremap_lock);
458         map = acpi_map_lookup(addr->address, addr->bit_width / 8);
459         if (!map) {
460                 mutex_unlock(&acpi_ioremap_lock);
461                 return;
462         }
463         acpi_os_drop_map_ref(map);
464         mutex_unlock(&acpi_ioremap_lock);
465
466         acpi_os_map_cleanup(map);
467 }
468
469 #ifdef ACPI_FUTURE_USAGE
470 acpi_status
471 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
472 {
473         if (!phys || !virt)
474                 return AE_BAD_PARAMETER;
475
476         *phys = virt_to_phys(virt);
477
478         return AE_OK;
479 }
480 #endif
481
482 #define ACPI_MAX_OVERRIDE_LEN 100
483
484 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
485
486 acpi_status
487 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
488                             acpi_string * new_val)
489 {
490         if (!init_val || !new_val)
491                 return AE_BAD_PARAMETER;
492
493         *new_val = NULL;
494         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
495                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
496                        acpi_os_name);
497                 *new_val = acpi_os_name;
498         }
499
500         return AE_OK;
501 }
502
503 acpi_status
504 acpi_os_table_override(struct acpi_table_header * existing_table,
505                        struct acpi_table_header ** new_table)
506 {
507         if (!existing_table || !new_table)
508                 return AE_BAD_PARAMETER;
509
510         *new_table = NULL;
511
512 #ifdef CONFIG_ACPI_CUSTOM_DSDT
513         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
514                 *new_table = (struct acpi_table_header *)AmlCode;
515 #endif
516         if (*new_table != NULL) {
517                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
518                            "this is unsafe: tainting kernel\n",
519                        existing_table->signature,
520                        existing_table->oem_table_id);
521                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
522         }
523         return AE_OK;
524 }
525
526 static irqreturn_t acpi_irq(int irq, void *dev_id)
527 {
528         u32 handled;
529
530         handled = (*acpi_irq_handler) (acpi_irq_context);
531
532         if (handled) {
533                 acpi_irq_handled++;
534                 return IRQ_HANDLED;
535         } else {
536                 acpi_irq_not_handled++;
537                 return IRQ_NONE;
538         }
539 }
540
541 acpi_status
542 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
543                                   void *context)
544 {
545         unsigned int irq;
546
547         acpi_irq_stats_init();
548
549         /*
550          * ACPI interrupts different from the SCI in our copy of the FADT are
551          * not supported.
552          */
553         if (gsi != acpi_gbl_FADT.sci_interrupt)
554                 return AE_BAD_PARAMETER;
555
556         if (acpi_irq_handler)
557                 return AE_ALREADY_ACQUIRED;
558
559         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
560                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
561                        gsi);
562                 return AE_OK;
563         }
564
565         acpi_irq_handler = handler;
566         acpi_irq_context = context;
567         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
568                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
569                 acpi_irq_handler = NULL;
570                 return AE_NOT_ACQUIRED;
571         }
572
573         return AE_OK;
574 }
575
576 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
577 {
578         if (irq != acpi_gbl_FADT.sci_interrupt)
579                 return AE_BAD_PARAMETER;
580
581         free_irq(irq, acpi_irq);
582         acpi_irq_handler = NULL;
583
584         return AE_OK;
585 }
586
587 /*
588  * Running in interpreter thread context, safe to sleep
589  */
590
591 void acpi_os_sleep(u64 ms)
592 {
593         schedule_timeout_interruptible(msecs_to_jiffies(ms));
594 }
595
596 void acpi_os_stall(u32 us)
597 {
598         while (us) {
599                 u32 delay = 1000;
600
601                 if (delay > us)
602                         delay = us;
603                 udelay(delay);
604                 touch_nmi_watchdog();
605                 us -= delay;
606         }
607 }
608
609 /*
610  * Support ACPI 3.0 AML Timer operand
611  * Returns 64-bit free-running, monotonically increasing timer
612  * with 100ns granularity
613  */
614 u64 acpi_os_get_timer(void)
615 {
616         static u64 t;
617
618 #ifdef  CONFIG_HPET
619         /* TBD: use HPET if available */
620 #endif
621
622 #ifdef  CONFIG_X86_PM_TIMER
623         /* TBD: default to PM timer if HPET was not available */
624 #endif
625         if (!t)
626                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
627
628         return ++t;
629 }
630
631 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
632 {
633         u32 dummy;
634
635         if (!value)
636                 value = &dummy;
637
638         *value = 0;
639         if (width <= 8) {
640                 *(u8 *) value = inb(port);
641         } else if (width <= 16) {
642                 *(u16 *) value = inw(port);
643         } else if (width <= 32) {
644                 *(u32 *) value = inl(port);
645         } else {
646                 BUG();
647         }
648
649         return AE_OK;
650 }
651
652 EXPORT_SYMBOL(acpi_os_read_port);
653
654 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
655 {
656         if (width <= 8) {
657                 outb(value, port);
658         } else if (width <= 16) {
659                 outw(value, port);
660         } else if (width <= 32) {
661                 outl(value, port);
662         } else {
663                 BUG();
664         }
665
666         return AE_OK;
667 }
668
669 EXPORT_SYMBOL(acpi_os_write_port);
670
671 acpi_status
672 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
673 {
674         void __iomem *virt_addr;
675         unsigned int size = width / 8;
676         bool unmap = false;
677         u32 dummy;
678
679         rcu_read_lock();
680         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
681         if (!virt_addr) {
682                 rcu_read_unlock();
683                 virt_addr = acpi_os_ioremap(phys_addr, size);
684                 if (!virt_addr)
685                         return AE_BAD_ADDRESS;
686                 unmap = true;
687         }
688
689         if (!value)
690                 value = &dummy;
691
692         switch (width) {
693         case 8:
694                 *(u8 *) value = readb(virt_addr);
695                 break;
696         case 16:
697                 *(u16 *) value = readw(virt_addr);
698                 break;
699         case 32:
700                 *(u32 *) value = readl(virt_addr);
701                 break;
702         default:
703                 BUG();
704         }
705
706         if (unmap)
707                 iounmap(virt_addr);
708         else
709                 rcu_read_unlock();
710
711         return AE_OK;
712 }
713
714 acpi_status
715 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
716 {
717         void __iomem *virt_addr;
718         unsigned int size = width / 8;
719         bool unmap = false;
720
721         rcu_read_lock();
722         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
723         if (!virt_addr) {
724                 rcu_read_unlock();
725                 virt_addr = acpi_os_ioremap(phys_addr, size);
726                 if (!virt_addr)
727                         return AE_BAD_ADDRESS;
728                 unmap = true;
729         }
730
731         switch (width) {
732         case 8:
733                 writeb(value, virt_addr);
734                 break;
735         case 16:
736                 writew(value, virt_addr);
737                 break;
738         case 32:
739                 writel(value, virt_addr);
740                 break;
741         default:
742                 BUG();
743         }
744
745         if (unmap)
746                 iounmap(virt_addr);
747         else
748                 rcu_read_unlock();
749
750         return AE_OK;
751 }
752
753 acpi_status
754 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
755                                u64 *value, u32 width)
756 {
757         int result, size;
758         u32 value32;
759
760         if (!value)
761                 return AE_BAD_PARAMETER;
762
763         switch (width) {
764         case 8:
765                 size = 1;
766                 break;
767         case 16:
768                 size = 2;
769                 break;
770         case 32:
771                 size = 4;
772                 break;
773         default:
774                 return AE_ERROR;
775         }
776
777         result = raw_pci_read(pci_id->segment, pci_id->bus,
778                                 PCI_DEVFN(pci_id->device, pci_id->function),
779                                 reg, size, &value32);
780         *value = value32;
781
782         return (result ? AE_ERROR : AE_OK);
783 }
784
785 acpi_status
786 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
787                                 u64 value, u32 width)
788 {
789         int result, size;
790
791         switch (width) {
792         case 8:
793                 size = 1;
794                 break;
795         case 16:
796                 size = 2;
797                 break;
798         case 32:
799                 size = 4;
800                 break;
801         default:
802                 return AE_ERROR;
803         }
804
805         result = raw_pci_write(pci_id->segment, pci_id->bus,
806                                 PCI_DEVFN(pci_id->device, pci_id->function),
807                                 reg, size, value);
808
809         return (result ? AE_ERROR : AE_OK);
810 }
811
812 static void acpi_os_execute_deferred(struct work_struct *work)
813 {
814         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
815
816         if (dpc->wait)
817                 acpi_os_wait_events_complete(NULL);
818
819         dpc->function(dpc->context);
820         kfree(dpc);
821 }
822
823 /*******************************************************************************
824  *
825  * FUNCTION:    acpi_os_execute
826  *
827  * PARAMETERS:  Type               - Type of the callback
828  *              Function           - Function to be executed
829  *              Context            - Function parameters
830  *
831  * RETURN:      Status
832  *
833  * DESCRIPTION: Depending on type, either queues function for deferred execution or
834  *              immediately executes function on a separate thread.
835  *
836  ******************************************************************************/
837
838 static acpi_status __acpi_os_execute(acpi_execute_type type,
839         acpi_osd_exec_callback function, void *context, int hp)
840 {
841         acpi_status status = AE_OK;
842         struct acpi_os_dpc *dpc;
843         struct workqueue_struct *queue;
844         int ret;
845         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
846                           "Scheduling function [%p(%p)] for deferred execution.\n",
847                           function, context));
848
849         /*
850          * Allocate/initialize DPC structure.  Note that this memory will be
851          * freed by the callee.  The kernel handles the work_struct list  in a
852          * way that allows us to also free its memory inside the callee.
853          * Because we may want to schedule several tasks with different
854          * parameters we can't use the approach some kernel code uses of
855          * having a static work_struct.
856          */
857
858         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
859         if (!dpc)
860                 return AE_NO_MEMORY;
861
862         dpc->function = function;
863         dpc->context = context;
864
865         /*
866          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
867          * because the hotplug code may call driver .remove() functions,
868          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
869          * to flush these workqueues.
870          */
871         queue = hp ? kacpi_hotplug_wq :
872                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
873         dpc->wait = hp ? 1 : 0;
874
875         if (queue == kacpi_hotplug_wq)
876                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
877         else if (queue == kacpi_notify_wq)
878                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
879         else
880                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
881
882         /*
883          * On some machines, a software-initiated SMI causes corruption unless
884          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
885          * typically it's done in GPE-related methods that are run via
886          * workqueues, so we can avoid the known corruption cases by always
887          * queueing on CPU 0.
888          */
889         ret = queue_work_on(0, queue, &dpc->work);
890
891         if (!ret) {
892                 printk(KERN_ERR PREFIX
893                           "Call to queue_work() failed.\n");
894                 status = AE_ERROR;
895                 kfree(dpc);
896         }
897         return status;
898 }
899
900 acpi_status acpi_os_execute(acpi_execute_type type,
901                             acpi_osd_exec_callback function, void *context)
902 {
903         return __acpi_os_execute(type, function, context, 0);
904 }
905 EXPORT_SYMBOL(acpi_os_execute);
906
907 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
908         void *context)
909 {
910         return __acpi_os_execute(0, function, context, 1);
911 }
912
913 void acpi_os_wait_events_complete(void *context)
914 {
915         flush_workqueue(kacpid_wq);
916         flush_workqueue(kacpi_notify_wq);
917 }
918
919 EXPORT_SYMBOL(acpi_os_wait_events_complete);
920
921 acpi_status
922 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
923 {
924         struct semaphore *sem = NULL;
925
926         sem = acpi_os_allocate(sizeof(struct semaphore));
927         if (!sem)
928                 return AE_NO_MEMORY;
929         memset(sem, 0, sizeof(struct semaphore));
930
931         sema_init(sem, initial_units);
932
933         *handle = (acpi_handle *) sem;
934
935         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
936                           *handle, initial_units));
937
938         return AE_OK;
939 }
940
941 /*
942  * TODO: A better way to delete semaphores?  Linux doesn't have a
943  * 'delete_semaphore()' function -- may result in an invalid
944  * pointer dereference for non-synchronized consumers.  Should
945  * we at least check for blocked threads and signal/cancel them?
946  */
947
948 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
949 {
950         struct semaphore *sem = (struct semaphore *)handle;
951
952         if (!sem)
953                 return AE_BAD_PARAMETER;
954
955         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
956
957         BUG_ON(!list_empty(&sem->wait_list));
958         kfree(sem);
959         sem = NULL;
960
961         return AE_OK;
962 }
963
964 /*
965  * TODO: Support for units > 1?
966  */
967 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
968 {
969         acpi_status status = AE_OK;
970         struct semaphore *sem = (struct semaphore *)handle;
971         long jiffies;
972         int ret = 0;
973
974         if (!sem || (units < 1))
975                 return AE_BAD_PARAMETER;
976
977         if (units > 1)
978                 return AE_SUPPORT;
979
980         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
981                           handle, units, timeout));
982
983         if (timeout == ACPI_WAIT_FOREVER)
984                 jiffies = MAX_SCHEDULE_TIMEOUT;
985         else
986                 jiffies = msecs_to_jiffies(timeout);
987         
988         ret = down_timeout(sem, jiffies);
989         if (ret)
990                 status = AE_TIME;
991
992         if (ACPI_FAILURE(status)) {
993                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
994                                   "Failed to acquire semaphore[%p|%d|%d], %s",
995                                   handle, units, timeout,
996                                   acpi_format_exception(status)));
997         } else {
998                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
999                                   "Acquired semaphore[%p|%d|%d]", handle,
1000                                   units, timeout));
1001         }
1002
1003         return status;
1004 }
1005
1006 /*
1007  * TODO: Support for units > 1?
1008  */
1009 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1010 {
1011         struct semaphore *sem = (struct semaphore *)handle;
1012
1013         if (!sem || (units < 1))
1014                 return AE_BAD_PARAMETER;
1015
1016         if (units > 1)
1017                 return AE_SUPPORT;
1018
1019         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1020                           units));
1021
1022         up(sem);
1023
1024         return AE_OK;
1025 }
1026
1027 #ifdef ACPI_FUTURE_USAGE
1028 u32 acpi_os_get_line(char *buffer)
1029 {
1030
1031 #ifdef ENABLE_DEBUGGER
1032         if (acpi_in_debugger) {
1033                 u32 chars;
1034
1035                 kdb_read(buffer, sizeof(line_buf));
1036
1037                 /* remove the CR kdb includes */
1038                 chars = strlen(buffer) - 1;
1039                 buffer[chars] = '\0';
1040         }
1041 #endif
1042
1043         return 0;
1044 }
1045 #endif                          /*  ACPI_FUTURE_USAGE  */
1046
1047 acpi_status acpi_os_signal(u32 function, void *info)
1048 {
1049         switch (function) {
1050         case ACPI_SIGNAL_FATAL:
1051                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1052                 break;
1053         case ACPI_SIGNAL_BREAKPOINT:
1054                 /*
1055                  * AML Breakpoint
1056                  * ACPI spec. says to treat it as a NOP unless
1057                  * you are debugging.  So if/when we integrate
1058                  * AML debugger into the kernel debugger its
1059                  * hook will go here.  But until then it is
1060                  * not useful to print anything on breakpoints.
1061                  */
1062                 break;
1063         default:
1064                 break;
1065         }
1066
1067         return AE_OK;
1068 }
1069
1070 static int __init acpi_os_name_setup(char *str)
1071 {
1072         char *p = acpi_os_name;
1073         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1074
1075         if (!str || !*str)
1076                 return 0;
1077
1078         for (; count-- && str && *str; str++) {
1079                 if (isalnum(*str) || *str == ' ' || *str == ':')
1080                         *p++ = *str;
1081                 else if (*str == '\'' || *str == '"')
1082                         continue;
1083                 else
1084                         break;
1085         }
1086         *p = 0;
1087
1088         return 1;
1089
1090 }
1091
1092 __setup("acpi_os_name=", acpi_os_name_setup);
1093
1094 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1095 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1096
1097 struct osi_setup_entry {
1098         char string[OSI_STRING_LENGTH_MAX];
1099         bool enable;
1100 };
1101
1102 static struct osi_setup_entry __initdata
1103                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1104         {"Module Device", true},
1105         {"Processor Device", true},
1106         {"3.0 _SCP Extensions", true},
1107         {"Processor Aggregator Device", true},
1108 };
1109
1110 void __init acpi_osi_setup(char *str)
1111 {
1112         struct osi_setup_entry *osi;
1113         bool enable = true;
1114         int i;
1115
1116         if (!acpi_gbl_create_osi_method)
1117                 return;
1118
1119         if (str == NULL || *str == '\0') {
1120                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1121                 acpi_gbl_create_osi_method = FALSE;
1122                 return;
1123         }
1124
1125         if (*str == '!') {
1126                 str++;
1127                 enable = false;
1128         }
1129
1130         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1131                 osi = &osi_setup_entries[i];
1132                 if (!strcmp(osi->string, str)) {
1133                         osi->enable = enable;
1134                         break;
1135                 } else if (osi->string[0] == '\0') {
1136                         osi->enable = enable;
1137                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1138                         break;
1139                 }
1140         }
1141 }
1142
1143 static void __init set_osi_linux(unsigned int enable)
1144 {
1145         if (osi_linux.enable != enable)
1146                 osi_linux.enable = enable;
1147
1148         if (osi_linux.enable)
1149                 acpi_osi_setup("Linux");
1150         else
1151                 acpi_osi_setup("!Linux");
1152
1153         return;
1154 }
1155
1156 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1157 {
1158         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1159         osi_linux.dmi = 0;
1160         set_osi_linux(enable);
1161
1162         return;
1163 }
1164
1165 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1166 {
1167         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1168
1169         if (enable == -1)
1170                 return;
1171
1172         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1173         set_osi_linux(enable);
1174
1175         return;
1176 }
1177
1178 /*
1179  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1180  *
1181  * empty string disables _OSI
1182  * string starting with '!' disables that string
1183  * otherwise string is added to list, augmenting built-in strings
1184  */
1185 static void __init acpi_osi_setup_late(void)
1186 {
1187         struct osi_setup_entry *osi;
1188         char *str;
1189         int i;
1190         acpi_status status;
1191
1192         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1193                 osi = &osi_setup_entries[i];
1194                 str = osi->string;
1195
1196                 if (*str == '\0')
1197                         break;
1198                 if (osi->enable) {
1199                         status = acpi_install_interface(str);
1200
1201                         if (ACPI_SUCCESS(status))
1202                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1203                 } else {
1204                         status = acpi_remove_interface(str);
1205
1206                         if (ACPI_SUCCESS(status))
1207                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1208                 }
1209         }
1210 }
1211
1212 static int __init osi_setup(char *str)
1213 {
1214         if (str && !strcmp("Linux", str))
1215                 acpi_cmdline_osi_linux(1);
1216         else if (str && !strcmp("!Linux", str))
1217                 acpi_cmdline_osi_linux(0);
1218         else
1219                 acpi_osi_setup(str);
1220
1221         return 1;
1222 }
1223
1224 __setup("acpi_osi=", osi_setup);
1225
1226 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1227 static int __init acpi_serialize_setup(char *str)
1228 {
1229         printk(KERN_INFO PREFIX "serialize enabled\n");
1230
1231         acpi_gbl_all_methods_serialized = TRUE;
1232
1233         return 1;
1234 }
1235
1236 __setup("acpi_serialize", acpi_serialize_setup);
1237
1238 /* Check of resource interference between native drivers and ACPI
1239  * OperationRegions (SystemIO and System Memory only).
1240  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1241  * in arbitrary AML code and can interfere with legacy drivers.
1242  * acpi_enforce_resources= can be set to:
1243  *
1244  *   - strict (default) (2)
1245  *     -> further driver trying to access the resources will not load
1246  *   - lax              (1)
1247  *     -> further driver trying to access the resources will load, but you
1248  *     get a system message that something might go wrong...
1249  *
1250  *   - no               (0)
1251  *     -> ACPI Operation Region resources will not be registered
1252  *
1253  */
1254 #define ENFORCE_RESOURCES_STRICT 2
1255 #define ENFORCE_RESOURCES_LAX    1
1256 #define ENFORCE_RESOURCES_NO     0
1257
1258 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1259
1260 static int __init acpi_enforce_resources_setup(char *str)
1261 {
1262         if (str == NULL || *str == '\0')
1263                 return 0;
1264
1265         if (!strcmp("strict", str))
1266                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1267         else if (!strcmp("lax", str))
1268                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1269         else if (!strcmp("no", str))
1270                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1271
1272         return 1;
1273 }
1274
1275 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1276
1277 /* Check for resource conflicts between ACPI OperationRegions and native
1278  * drivers */
1279 int acpi_check_resource_conflict(const struct resource *res)
1280 {
1281         struct acpi_res_list *res_list_elem;
1282         int ioport = 0, clash = 0;
1283
1284         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1285                 return 0;
1286         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1287                 return 0;
1288
1289         ioport = res->flags & IORESOURCE_IO;
1290
1291         spin_lock(&acpi_res_lock);
1292         list_for_each_entry(res_list_elem, &resource_list_head,
1293                             resource_list) {
1294                 if (ioport && (res_list_elem->resource_type
1295                                != ACPI_ADR_SPACE_SYSTEM_IO))
1296                         continue;
1297                 if (!ioport && (res_list_elem->resource_type
1298                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1299                         continue;
1300
1301                 if (res->end < res_list_elem->start
1302                     || res_list_elem->end < res->start)
1303                         continue;
1304                 clash = 1;
1305                 break;
1306         }
1307         spin_unlock(&acpi_res_lock);
1308
1309         if (clash) {
1310                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1311                         printk(KERN_WARNING "ACPI: resource %s %pR"
1312                                " conflicts with ACPI region %s "
1313                                "[%s 0x%zx-0x%zx]\n",
1314                                res->name, res, res_list_elem->name,
1315                                (res_list_elem->resource_type ==
1316                                 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1317                                (size_t) res_list_elem->start,
1318                                (size_t) res_list_elem->end);
1319                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1320                                 printk(KERN_NOTICE "ACPI: This conflict may"
1321                                        " cause random problems and system"
1322                                        " instability\n");
1323                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1324                                " for this device, you should use it instead of"
1325                                " the native driver\n");
1326                 }
1327                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1328                         return -EBUSY;
1329         }
1330         return 0;
1331 }
1332 EXPORT_SYMBOL(acpi_check_resource_conflict);
1333
1334 int acpi_check_region(resource_size_t start, resource_size_t n,
1335                       const char *name)
1336 {
1337         struct resource res = {
1338                 .start = start,
1339                 .end   = start + n - 1,
1340                 .name  = name,
1341                 .flags = IORESOURCE_IO,
1342         };
1343
1344         return acpi_check_resource_conflict(&res);
1345 }
1346 EXPORT_SYMBOL(acpi_check_region);
1347
1348 /*
1349  * Let drivers know whether the resource checks are effective
1350  */
1351 int acpi_resources_are_enforced(void)
1352 {
1353         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1354 }
1355 EXPORT_SYMBOL(acpi_resources_are_enforced);
1356
1357 /*
1358  * Deallocate the memory for a spinlock.
1359  */
1360 void acpi_os_delete_lock(acpi_spinlock handle)
1361 {
1362         ACPI_FREE(handle);
1363 }
1364
1365 /*
1366  * Acquire a spinlock.
1367  *
1368  * handle is a pointer to the spinlock_t.
1369  */
1370
1371 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1372 {
1373         acpi_cpu_flags flags;
1374         spin_lock_irqsave(lockp, flags);
1375         return flags;
1376 }
1377
1378 /*
1379  * Release a spinlock. See above.
1380  */
1381
1382 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1383 {
1384         spin_unlock_irqrestore(lockp, flags);
1385 }
1386
1387 #ifndef ACPI_USE_LOCAL_CACHE
1388
1389 /*******************************************************************************
1390  *
1391  * FUNCTION:    acpi_os_create_cache
1392  *
1393  * PARAMETERS:  name      - Ascii name for the cache
1394  *              size      - Size of each cached object
1395  *              depth     - Maximum depth of the cache (in objects) <ignored>
1396  *              cache     - Where the new cache object is returned
1397  *
1398  * RETURN:      status
1399  *
1400  * DESCRIPTION: Create a cache object
1401  *
1402  ******************************************************************************/
1403
1404 acpi_status
1405 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1406 {
1407         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1408         if (*cache == NULL)
1409                 return AE_ERROR;
1410         else
1411                 return AE_OK;
1412 }
1413
1414 /*******************************************************************************
1415  *
1416  * FUNCTION:    acpi_os_purge_cache
1417  *
1418  * PARAMETERS:  Cache           - Handle to cache object
1419  *
1420  * RETURN:      Status
1421  *
1422  * DESCRIPTION: Free all objects within the requested cache.
1423  *
1424  ******************************************************************************/
1425
1426 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1427 {
1428         kmem_cache_shrink(cache);
1429         return (AE_OK);
1430 }
1431
1432 /*******************************************************************************
1433  *
1434  * FUNCTION:    acpi_os_delete_cache
1435  *
1436  * PARAMETERS:  Cache           - Handle to cache object
1437  *
1438  * RETURN:      Status
1439  *
1440  * DESCRIPTION: Free all objects within the requested cache and delete the
1441  *              cache object.
1442  *
1443  ******************************************************************************/
1444
1445 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1446 {
1447         kmem_cache_destroy(cache);
1448         return (AE_OK);
1449 }
1450
1451 /*******************************************************************************
1452  *
1453  * FUNCTION:    acpi_os_release_object
1454  *
1455  * PARAMETERS:  Cache       - Handle to cache object
1456  *              Object      - The object to be released
1457  *
1458  * RETURN:      None
1459  *
1460  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1461  *              the object is deleted.
1462  *
1463  ******************************************************************************/
1464
1465 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1466 {
1467         kmem_cache_free(cache, object);
1468         return (AE_OK);
1469 }
1470
1471 static inline int acpi_res_list_add(struct acpi_res_list *res)
1472 {
1473         struct acpi_res_list *res_list_elem;
1474
1475         list_for_each_entry(res_list_elem, &resource_list_head,
1476                             resource_list) {
1477
1478                 if (res->resource_type == res_list_elem->resource_type &&
1479                     res->start == res_list_elem->start &&
1480                     res->end == res_list_elem->end) {
1481
1482                         /*
1483                          * The Region(addr,len) already exist in the list,
1484                          * just increase the count
1485                          */
1486
1487                         res_list_elem->count++;
1488                         return 0;
1489                 }
1490         }
1491
1492         res->count = 1;
1493         list_add(&res->resource_list, &resource_list_head);
1494         return 1;
1495 }
1496
1497 static inline void acpi_res_list_del(struct acpi_res_list *res)
1498 {
1499         struct acpi_res_list *res_list_elem;
1500
1501         list_for_each_entry(res_list_elem, &resource_list_head,
1502                             resource_list) {
1503
1504                 if (res->resource_type == res_list_elem->resource_type &&
1505                     res->start == res_list_elem->start &&
1506                     res->end == res_list_elem->end) {
1507
1508                         /*
1509                          * If the res count is decreased to 0,
1510                          * remove and free it
1511                          */
1512
1513                         if (--res_list_elem->count == 0) {
1514                                 list_del(&res_list_elem->resource_list);
1515                                 kfree(res_list_elem);
1516                         }
1517                         return;
1518                 }
1519         }
1520 }
1521
1522 acpi_status
1523 acpi_os_invalidate_address(
1524     u8                   space_id,
1525     acpi_physical_address   address,
1526     acpi_size               length)
1527 {
1528         struct acpi_res_list res;
1529
1530         switch (space_id) {
1531         case ACPI_ADR_SPACE_SYSTEM_IO:
1532         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1533                 /* Only interference checks against SystemIO and SystemMemory
1534                    are needed */
1535                 res.start = address;
1536                 res.end = address + length - 1;
1537                 res.resource_type = space_id;
1538                 spin_lock(&acpi_res_lock);
1539                 acpi_res_list_del(&res);
1540                 spin_unlock(&acpi_res_lock);
1541                 break;
1542         case ACPI_ADR_SPACE_PCI_CONFIG:
1543         case ACPI_ADR_SPACE_EC:
1544         case ACPI_ADR_SPACE_SMBUS:
1545         case ACPI_ADR_SPACE_CMOS:
1546         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1547         case ACPI_ADR_SPACE_DATA_TABLE:
1548         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1549                 break;
1550         }
1551         return AE_OK;
1552 }
1553
1554 /******************************************************************************
1555  *
1556  * FUNCTION:    acpi_os_validate_address
1557  *
1558  * PARAMETERS:  space_id             - ACPI space ID
1559  *              address             - Physical address
1560  *              length              - Address length
1561  *
1562  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1563  *              should return AE_AML_ILLEGAL_ADDRESS.
1564  *
1565  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1566  *              the addresses accessed by AML operation regions.
1567  *
1568  *****************************************************************************/
1569
1570 acpi_status
1571 acpi_os_validate_address (
1572     u8                   space_id,
1573     acpi_physical_address   address,
1574     acpi_size               length,
1575     char *name)
1576 {
1577         struct acpi_res_list *res;
1578         int added;
1579         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1580                 return AE_OK;
1581
1582         switch (space_id) {
1583         case ACPI_ADR_SPACE_SYSTEM_IO:
1584         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1585                 /* Only interference checks against SystemIO and SystemMemory
1586                    are needed */
1587                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1588                 if (!res)
1589                         return AE_OK;
1590                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1591                 strlcpy(res->name, name, 5);
1592                 res->start = address;
1593                 res->end = address + length - 1;
1594                 res->resource_type = space_id;
1595                 spin_lock(&acpi_res_lock);
1596                 added = acpi_res_list_add(res);
1597                 spin_unlock(&acpi_res_lock);
1598                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1599                          "name: %s\n", added ? "Added" : "Already exist",
1600                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1601                          ? "SystemIO" : "System Memory",
1602                          (unsigned long long)res->start,
1603                          (unsigned long long)res->end,
1604                          res->name);
1605                 if (!added)
1606                         kfree(res);
1607                 break;
1608         case ACPI_ADR_SPACE_PCI_CONFIG:
1609         case ACPI_ADR_SPACE_EC:
1610         case ACPI_ADR_SPACE_SMBUS:
1611         case ACPI_ADR_SPACE_CMOS:
1612         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1613         case ACPI_ADR_SPACE_DATA_TABLE:
1614         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1615                 break;
1616         }
1617         return AE_OK;
1618 }
1619 #endif
1620
1621 acpi_status __init acpi_os_initialize(void)
1622 {
1623         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1624         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1625         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1626         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1627
1628         return AE_OK;
1629 }
1630
1631 acpi_status __init acpi_os_initialize1(void)
1632 {
1633         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1634         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1635         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1636         BUG_ON(!kacpid_wq);
1637         BUG_ON(!kacpi_notify_wq);
1638         BUG_ON(!kacpi_hotplug_wq);
1639         acpi_install_interface_handler(acpi_osi_handler);
1640         acpi_osi_setup_late();
1641         return AE_OK;
1642 }
1643
1644 acpi_status acpi_os_terminate(void)
1645 {
1646         if (acpi_irq_handler) {
1647                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1648                                                  acpi_irq_handler);
1649         }
1650
1651         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1652         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1653         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1654         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1655
1656         destroy_workqueue(kacpid_wq);
1657         destroy_workqueue(kacpi_notify_wq);
1658         destroy_workqueue(kacpi_hotplug_wq);
1659
1660         return AE_OK;
1661 }