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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
4 *
5 * Copyright (C) 2000 Andrew Henroid
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 * Copyright (c) 2008 Intel Corporation
9 * Author: Matthew Wilcox <willy@linux.intel.com>
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/mm.h>
16#include <linux/highmem.h>
17#include <linux/lockdep.h>
18#include <linux/pci.h>
19#include <linux/interrupt.h>
20#include <linux/kmod.h>
21#include <linux/delay.h>
22#include <linux/workqueue.h>
23#include <linux/nmi.h>
24#include <linux/acpi.h>
25#include <linux/efi.h>
26#include <linux/ioport.h>
27#include <linux/list.h>
28#include <linux/jiffies.h>
29#include <linux/semaphore.h>
30#include <linux/security.h>
31
32#include <asm/io.h>
33#include <linux/uaccess.h>
34#include <linux/io-64-nonatomic-lo-hi.h>
35
36#include "acpica/accommon.h"
37#include "acpica/acnamesp.h"
38#include "internal.h"
39
40#define _COMPONENT ACPI_OS_SERVICES
41ACPI_MODULE_NAME("osl");
42
43struct acpi_os_dpc {
44 acpi_osd_exec_callback function;
45 void *context;
46 struct work_struct work;
47};
48
49#ifdef ENABLE_DEBUGGER
50#include <linux/kdb.h>
51
52/* stuff for debugger support */
53int acpi_in_debugger;
54EXPORT_SYMBOL(acpi_in_debugger);
55#endif /*ENABLE_DEBUGGER */
56
57static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
58 u32 pm1b_ctrl);
59static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
60 u32 val_b);
61
62static acpi_osd_handler acpi_irq_handler;
63static void *acpi_irq_context;
64static struct workqueue_struct *kacpid_wq;
65static struct workqueue_struct *kacpi_notify_wq;
66static struct workqueue_struct *kacpi_hotplug_wq;
67static bool acpi_os_initialized;
68unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
69bool acpi_permanent_mmap = false;
70
71/*
72 * This list of permanent mappings is for memory that may be accessed from
73 * interrupt context, where we can't do the ioremap().
74 */
75struct acpi_ioremap {
76 struct list_head list;
77 void __iomem *virt;
78 acpi_physical_address phys;
79 acpi_size size;
80 union {
81 unsigned long refcount;
82 struct rcu_work rwork;
83 } track;
84};
85
86static LIST_HEAD(acpi_ioremaps);
87static DEFINE_MUTEX(acpi_ioremap_lock);
88#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
89
90static void __init acpi_request_region (struct acpi_generic_address *gas,
91 unsigned int length, char *desc)
92{
93 u64 addr;
94
95 /* Handle possible alignment issues */
96 memcpy(&addr, &gas->address, sizeof(addr));
97 if (!addr || !length)
98 return;
99
100 /* Resources are never freed */
101 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
102 request_region(addr, length, desc);
103 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
104 request_mem_region(addr, length, desc);
105}
106
107static int __init acpi_reserve_resources(void)
108{
109 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
110 "ACPI PM1a_EVT_BLK");
111
112 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
113 "ACPI PM1b_EVT_BLK");
114
115 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
116 "ACPI PM1a_CNT_BLK");
117
118 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
119 "ACPI PM1b_CNT_BLK");
120
121 if (acpi_gbl_FADT.pm_timer_length == 4)
122 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
123
124 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
125 "ACPI PM2_CNT_BLK");
126
127 /* Length of GPE blocks must be a non-negative multiple of 2 */
128
129 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
130 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
131 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
132
133 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
134 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
135 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
136
137 return 0;
138}
139fs_initcall_sync(acpi_reserve_resources);
140
141void acpi_os_printf(const char *fmt, ...)
142{
143 va_list args;
144 va_start(args, fmt);
145 acpi_os_vprintf(fmt, args);
146 va_end(args);
147}
148EXPORT_SYMBOL(acpi_os_printf);
149
150void acpi_os_vprintf(const char *fmt, va_list args)
151{
152 static char buffer[512];
153
154 vsprintf(buffer, fmt, args);
155
156#ifdef ENABLE_DEBUGGER
157 if (acpi_in_debugger) {
158 kdb_printf("%s", buffer);
159 } else {
160 if (printk_get_level(buffer))
161 printk("%s", buffer);
162 else
163 printk(KERN_CONT "%s", buffer);
164 }
165#else
166 if (acpi_debugger_write_log(buffer) < 0) {
167 if (printk_get_level(buffer))
168 printk("%s", buffer);
169 else
170 printk(KERN_CONT "%s", buffer);
171 }
172#endif
173}
174
175#ifdef CONFIG_KEXEC
176static unsigned long acpi_rsdp;
177static int __init setup_acpi_rsdp(char *arg)
178{
179 return kstrtoul(arg, 16, &acpi_rsdp);
180}
181early_param("acpi_rsdp", setup_acpi_rsdp);
182#endif
183
184acpi_physical_address __init acpi_os_get_root_pointer(void)
185{
186 acpi_physical_address pa;
187
188#ifdef CONFIG_KEXEC
189 /*
190 * We may have been provided with an RSDP on the command line,
191 * but if a malicious user has done so they may be pointing us
192 * at modified ACPI tables that could alter kernel behaviour -
193 * so, we check the lockdown status before making use of
194 * it. If we trust it then also stash it in an architecture
195 * specific location (if appropriate) so it can be carried
196 * over further kexec()s.
197 */
198 if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
199 acpi_arch_set_root_pointer(acpi_rsdp);
200 return acpi_rsdp;
201 }
202#endif
203 pa = acpi_arch_get_root_pointer();
204 if (pa)
205 return pa;
206
207 if (efi_enabled(EFI_CONFIG_TABLES)) {
208 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
209 return efi.acpi20;
210 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
211 return efi.acpi;
212 pr_err(PREFIX "System description tables not found\n");
213 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
214 acpi_find_root_pointer(&pa);
215 }
216
217 return pa;
218}
219
220/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
221static struct acpi_ioremap *
222acpi_map_lookup(acpi_physical_address phys, acpi_size size)
223{
224 struct acpi_ioremap *map;
225
226 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
227 if (map->phys <= phys &&
228 phys + size <= map->phys + map->size)
229 return map;
230
231 return NULL;
232}
233
234/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
235static void __iomem *
236acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
237{
238 struct acpi_ioremap *map;
239
240 map = acpi_map_lookup(phys, size);
241 if (map)
242 return map->virt + (phys - map->phys);
243
244 return NULL;
245}
246
247void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
248{
249 struct acpi_ioremap *map;
250 void __iomem *virt = NULL;
251
252 mutex_lock(&acpi_ioremap_lock);
253 map = acpi_map_lookup(phys, size);
254 if (map) {
255 virt = map->virt + (phys - map->phys);
256 map->track.refcount++;
257 }
258 mutex_unlock(&acpi_ioremap_lock);
259 return virt;
260}
261EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
262
263/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
264static struct acpi_ioremap *
265acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
266{
267 struct acpi_ioremap *map;
268
269 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
270 if (map->virt <= virt &&
271 virt + size <= map->virt + map->size)
272 return map;
273
274 return NULL;
275}
276
277#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
278/* ioremap will take care of cache attributes */
279#define should_use_kmap(pfn) 0
280#else
281#define should_use_kmap(pfn) page_is_ram(pfn)
282#endif
283
284static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
285{
286 unsigned long pfn;
287
288 pfn = pg_off >> PAGE_SHIFT;
289 if (should_use_kmap(pfn)) {
290 if (pg_sz > PAGE_SIZE)
291 return NULL;
292 return (void __iomem __force *)kmap(pfn_to_page(pfn));
293 } else
294 return acpi_os_ioremap(pg_off, pg_sz);
295}
296
297static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
298{
299 unsigned long pfn;
300
301 pfn = pg_off >> PAGE_SHIFT;
302 if (should_use_kmap(pfn))
303 kunmap(pfn_to_page(pfn));
304 else
305 iounmap(vaddr);
306}
307
308/**
309 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
310 * @phys: Start of the physical address range to map.
311 * @size: Size of the physical address range to map.
312 *
313 * Look up the given physical address range in the list of existing ACPI memory
314 * mappings. If found, get a reference to it and return a pointer to it (its
315 * virtual address). If not found, map it, add it to that list and return a
316 * pointer to it.
317 *
318 * During early init (when acpi_permanent_mmap has not been set yet) this
319 * routine simply calls __acpi_map_table() to get the job done.
320 */
321void __iomem __ref
322*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
323{
324 struct acpi_ioremap *map;
325 void __iomem *virt;
326 acpi_physical_address pg_off;
327 acpi_size pg_sz;
328
329 if (phys > ULONG_MAX) {
330 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
331 return NULL;
332 }
333
334 if (!acpi_permanent_mmap)
335 return __acpi_map_table((unsigned long)phys, size);
336
337 mutex_lock(&acpi_ioremap_lock);
338 /* Check if there's a suitable mapping already. */
339 map = acpi_map_lookup(phys, size);
340 if (map) {
341 map->track.refcount++;
342 goto out;
343 }
344
345 map = kzalloc(sizeof(*map), GFP_KERNEL);
346 if (!map) {
347 mutex_unlock(&acpi_ioremap_lock);
348 return NULL;
349 }
350
351 pg_off = round_down(phys, PAGE_SIZE);
352 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
353 virt = acpi_map(phys, size);
354 if (!virt) {
355 mutex_unlock(&acpi_ioremap_lock);
356 kfree(map);
357 return NULL;
358 }
359
360 INIT_LIST_HEAD(&map->list);
361 map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
362 map->phys = pg_off;
363 map->size = pg_sz;
364 map->track.refcount = 1;
365
366 list_add_tail_rcu(&map->list, &acpi_ioremaps);
367
368out:
369 mutex_unlock(&acpi_ioremap_lock);
370 return map->virt + (phys - map->phys);
371}
372EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
373
374void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
375{
376 return (void *)acpi_os_map_iomem(phys, size);
377}
378EXPORT_SYMBOL_GPL(acpi_os_map_memory);
379
380static void acpi_os_map_remove(struct work_struct *work)
381{
382 struct acpi_ioremap *map = container_of(to_rcu_work(work),
383 struct acpi_ioremap,
384 track.rwork);
385
386 acpi_unmap(map->phys, map->virt);
387 kfree(map);
388}
389
390/* Must be called with mutex_lock(&acpi_ioremap_lock) */
391static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
392{
393 if (--map->track.refcount)
394 return;
395
396 list_del_rcu(&map->list);
397
398 INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
399 queue_rcu_work(system_wq, &map->track.rwork);
400}
401
402/**
403 * acpi_os_unmap_iomem - Drop a memory mapping reference.
404 * @virt: Start of the address range to drop a reference to.
405 * @size: Size of the address range to drop a reference to.
406 *
407 * Look up the given virtual address range in the list of existing ACPI memory
408 * mappings, drop a reference to it and if there are no more active references
409 * to it, queue it up for later removal.
410 *
411 * During early init (when acpi_permanent_mmap has not been set yet) this
412 * routine simply calls __acpi_unmap_table() to get the job done. Since
413 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
414 * here.
415 */
416void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
417{
418 struct acpi_ioremap *map;
419
420 if (!acpi_permanent_mmap) {
421 __acpi_unmap_table(virt, size);
422 return;
423 }
424
425 mutex_lock(&acpi_ioremap_lock);
426
427 map = acpi_map_lookup_virt(virt, size);
428 if (!map) {
429 mutex_unlock(&acpi_ioremap_lock);
430 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
431 return;
432 }
433 acpi_os_drop_map_ref(map);
434
435 mutex_unlock(&acpi_ioremap_lock);
436}
437EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
438
439/**
440 * acpi_os_unmap_memory - Drop a memory mapping reference.
441 * @virt: Start of the address range to drop a reference to.
442 * @size: Size of the address range to drop a reference to.
443 */
444void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
445{
446 acpi_os_unmap_iomem((void __iomem *)virt, size);
447}
448EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450int acpi_os_map_generic_address(struct acpi_generic_address *gas)
451{
452 u64 addr;
453 void __iomem *virt;
454
455 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
456 return 0;
457
458 /* Handle possible alignment issues */
459 memcpy(&addr, &gas->address, sizeof(addr));
460 if (!addr || !gas->bit_width)
461 return -EINVAL;
462
463 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
464 if (!virt)
465 return -EIO;
466
467 return 0;
468}
469EXPORT_SYMBOL(acpi_os_map_generic_address);
470
471void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
472{
473 u64 addr;
474 struct acpi_ioremap *map;
475
476 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
477 return;
478
479 /* Handle possible alignment issues */
480 memcpy(&addr, &gas->address, sizeof(addr));
481 if (!addr || !gas->bit_width)
482 return;
483
484 mutex_lock(&acpi_ioremap_lock);
485
486 map = acpi_map_lookup(addr, gas->bit_width / 8);
487 if (!map) {
488 mutex_unlock(&acpi_ioremap_lock);
489 return;
490 }
491 acpi_os_drop_map_ref(map);
492
493 mutex_unlock(&acpi_ioremap_lock);
494}
495EXPORT_SYMBOL(acpi_os_unmap_generic_address);
496
497#ifdef ACPI_FUTURE_USAGE
498acpi_status
499acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
500{
501 if (!phys || !virt)
502 return AE_BAD_PARAMETER;
503
504 *phys = virt_to_phys(virt);
505
506 return AE_OK;
507}
508#endif
509
510#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
511static bool acpi_rev_override;
512
513int __init acpi_rev_override_setup(char *str)
514{
515 acpi_rev_override = true;
516 return 1;
517}
518__setup("acpi_rev_override", acpi_rev_override_setup);
519#else
520#define acpi_rev_override false
521#endif
522
523#define ACPI_MAX_OVERRIDE_LEN 100
524
525static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
526
527acpi_status
528acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
529 acpi_string *new_val)
530{
531 if (!init_val || !new_val)
532 return AE_BAD_PARAMETER;
533
534 *new_val = NULL;
535 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
536 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
537 acpi_os_name);
538 *new_val = acpi_os_name;
539 }
540
541 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
542 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
543 *new_val = (char *)5;
544 }
545
546 return AE_OK;
547}
548
549static irqreturn_t acpi_irq(int irq, void *dev_id)
550{
551 u32 handled;
552
553 handled = (*acpi_irq_handler) (acpi_irq_context);
554
555 if (handled) {
556 acpi_irq_handled++;
557 return IRQ_HANDLED;
558 } else {
559 acpi_irq_not_handled++;
560 return IRQ_NONE;
561 }
562}
563
564acpi_status
565acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
566 void *context)
567{
568 unsigned int irq;
569
570 acpi_irq_stats_init();
571
572 /*
573 * ACPI interrupts different from the SCI in our copy of the FADT are
574 * not supported.
575 */
576 if (gsi != acpi_gbl_FADT.sci_interrupt)
577 return AE_BAD_PARAMETER;
578
579 if (acpi_irq_handler)
580 return AE_ALREADY_ACQUIRED;
581
582 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
583 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
584 gsi);
585 return AE_OK;
586 }
587
588 acpi_irq_handler = handler;
589 acpi_irq_context = context;
590 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
591 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
592 acpi_irq_handler = NULL;
593 return AE_NOT_ACQUIRED;
594 }
595 acpi_sci_irq = irq;
596
597 return AE_OK;
598}
599
600acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
601{
602 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
603 return AE_BAD_PARAMETER;
604
605 free_irq(acpi_sci_irq, acpi_irq);
606 acpi_irq_handler = NULL;
607 acpi_sci_irq = INVALID_ACPI_IRQ;
608
609 return AE_OK;
610}
611
612/*
613 * Running in interpreter thread context, safe to sleep
614 */
615
616void acpi_os_sleep(u64 ms)
617{
618 msleep(ms);
619}
620
621void acpi_os_stall(u32 us)
622{
623 while (us) {
624 u32 delay = 1000;
625
626 if (delay > us)
627 delay = us;
628 udelay(delay);
629 touch_nmi_watchdog();
630 us -= delay;
631 }
632}
633
634/*
635 * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
636 * monotonically increasing timer with 100ns granularity. Do not use
637 * ktime_get() to implement this function because this function may get
638 * called after timekeeping has been suspended. Note: calling this function
639 * after timekeeping has been suspended may lead to unexpected results
640 * because when timekeeping is suspended the jiffies counter is not
641 * incremented. See also timekeeping_suspend().
642 */
643u64 acpi_os_get_timer(void)
644{
645 return (get_jiffies_64() - INITIAL_JIFFIES) *
646 (ACPI_100NSEC_PER_SEC / HZ);
647}
648
649acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
650{
651 u32 dummy;
652
653 if (!value)
654 value = &dummy;
655
656 *value = 0;
657 if (width <= 8) {
658 *(u8 *) value = inb(port);
659 } else if (width <= 16) {
660 *(u16 *) value = inw(port);
661 } else if (width <= 32) {
662 *(u32 *) value = inl(port);
663 } else {
664 BUG();
665 }
666
667 return AE_OK;
668}
669
670EXPORT_SYMBOL(acpi_os_read_port);
671
672acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
673{
674 if (width <= 8) {
675 outb(value, port);
676 } else if (width <= 16) {
677 outw(value, port);
678 } else if (width <= 32) {
679 outl(value, port);
680 } else {
681 BUG();
682 }
683
684 return AE_OK;
685}
686
687EXPORT_SYMBOL(acpi_os_write_port);
688
689int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
690{
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 case 64:
703 *(u64 *) value = readq(virt_addr);
704 break;
705 default:
706 return -EINVAL;
707 }
708
709 return 0;
710}
711
712acpi_status
713acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
714{
715 void __iomem *virt_addr;
716 unsigned int size = width / 8;
717 bool unmap = false;
718 u64 dummy;
719 int error;
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 if (!value)
732 value = &dummy;
733
734 error = acpi_os_read_iomem(virt_addr, value, width);
735 BUG_ON(error);
736
737 if (unmap)
738 iounmap(virt_addr);
739 else
740 rcu_read_unlock();
741
742 return AE_OK;
743}
744
745acpi_status
746acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
747{
748 void __iomem *virt_addr;
749 unsigned int size = width / 8;
750 bool unmap = false;
751
752 rcu_read_lock();
753 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
754 if (!virt_addr) {
755 rcu_read_unlock();
756 virt_addr = acpi_os_ioremap(phys_addr, size);
757 if (!virt_addr)
758 return AE_BAD_ADDRESS;
759 unmap = true;
760 }
761
762 switch (width) {
763 case 8:
764 writeb(value, virt_addr);
765 break;
766 case 16:
767 writew(value, virt_addr);
768 break;
769 case 32:
770 writel(value, virt_addr);
771 break;
772 case 64:
773 writeq(value, virt_addr);
774 break;
775 default:
776 BUG();
777 }
778
779 if (unmap)
780 iounmap(virt_addr);
781 else
782 rcu_read_unlock();
783
784 return AE_OK;
785}
786
787#ifdef CONFIG_PCI
788acpi_status
789acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
790 u64 *value, u32 width)
791{
792 int result, size;
793 u32 value32;
794
795 if (!value)
796 return AE_BAD_PARAMETER;
797
798 switch (width) {
799 case 8:
800 size = 1;
801 break;
802 case 16:
803 size = 2;
804 break;
805 case 32:
806 size = 4;
807 break;
808 default:
809 return AE_ERROR;
810 }
811
812 result = raw_pci_read(pci_id->segment, pci_id->bus,
813 PCI_DEVFN(pci_id->device, pci_id->function),
814 reg, size, &value32);
815 *value = value32;
816
817 return (result ? AE_ERROR : AE_OK);
818}
819
820acpi_status
821acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
822 u64 value, u32 width)
823{
824 int result, size;
825
826 switch (width) {
827 case 8:
828 size = 1;
829 break;
830 case 16:
831 size = 2;
832 break;
833 case 32:
834 size = 4;
835 break;
836 default:
837 return AE_ERROR;
838 }
839
840 result = raw_pci_write(pci_id->segment, pci_id->bus,
841 PCI_DEVFN(pci_id->device, pci_id->function),
842 reg, size, value);
843
844 return (result ? AE_ERROR : AE_OK);
845}
846#endif
847
848static void acpi_os_execute_deferred(struct work_struct *work)
849{
850 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
851
852 dpc->function(dpc->context);
853 kfree(dpc);
854}
855
856#ifdef CONFIG_ACPI_DEBUGGER
857static struct acpi_debugger acpi_debugger;
858static bool acpi_debugger_initialized;
859
860int acpi_register_debugger(struct module *owner,
861 const struct acpi_debugger_ops *ops)
862{
863 int ret = 0;
864
865 mutex_lock(&acpi_debugger.lock);
866 if (acpi_debugger.ops) {
867 ret = -EBUSY;
868 goto err_lock;
869 }
870
871 acpi_debugger.owner = owner;
872 acpi_debugger.ops = ops;
873
874err_lock:
875 mutex_unlock(&acpi_debugger.lock);
876 return ret;
877}
878EXPORT_SYMBOL(acpi_register_debugger);
879
880void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
881{
882 mutex_lock(&acpi_debugger.lock);
883 if (ops == acpi_debugger.ops) {
884 acpi_debugger.ops = NULL;
885 acpi_debugger.owner = NULL;
886 }
887 mutex_unlock(&acpi_debugger.lock);
888}
889EXPORT_SYMBOL(acpi_unregister_debugger);
890
891int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
892{
893 int ret;
894 int (*func)(acpi_osd_exec_callback, void *);
895 struct module *owner;
896
897 if (!acpi_debugger_initialized)
898 return -ENODEV;
899 mutex_lock(&acpi_debugger.lock);
900 if (!acpi_debugger.ops) {
901 ret = -ENODEV;
902 goto err_lock;
903 }
904 if (!try_module_get(acpi_debugger.owner)) {
905 ret = -ENODEV;
906 goto err_lock;
907 }
908 func = acpi_debugger.ops->create_thread;
909 owner = acpi_debugger.owner;
910 mutex_unlock(&acpi_debugger.lock);
911
912 ret = func(function, context);
913
914 mutex_lock(&acpi_debugger.lock);
915 module_put(owner);
916err_lock:
917 mutex_unlock(&acpi_debugger.lock);
918 return ret;
919}
920
921ssize_t acpi_debugger_write_log(const char *msg)
922{
923 ssize_t ret;
924 ssize_t (*func)(const char *);
925 struct module *owner;
926
927 if (!acpi_debugger_initialized)
928 return -ENODEV;
929 mutex_lock(&acpi_debugger.lock);
930 if (!acpi_debugger.ops) {
931 ret = -ENODEV;
932 goto err_lock;
933 }
934 if (!try_module_get(acpi_debugger.owner)) {
935 ret = -ENODEV;
936 goto err_lock;
937 }
938 func = acpi_debugger.ops->write_log;
939 owner = acpi_debugger.owner;
940 mutex_unlock(&acpi_debugger.lock);
941
942 ret = func(msg);
943
944 mutex_lock(&acpi_debugger.lock);
945 module_put(owner);
946err_lock:
947 mutex_unlock(&acpi_debugger.lock);
948 return ret;
949}
950
951ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
952{
953 ssize_t ret;
954 ssize_t (*func)(char *, size_t);
955 struct module *owner;
956
957 if (!acpi_debugger_initialized)
958 return -ENODEV;
959 mutex_lock(&acpi_debugger.lock);
960 if (!acpi_debugger.ops) {
961 ret = -ENODEV;
962 goto err_lock;
963 }
964 if (!try_module_get(acpi_debugger.owner)) {
965 ret = -ENODEV;
966 goto err_lock;
967 }
968 func = acpi_debugger.ops->read_cmd;
969 owner = acpi_debugger.owner;
970 mutex_unlock(&acpi_debugger.lock);
971
972 ret = func(buffer, buffer_length);
973
974 mutex_lock(&acpi_debugger.lock);
975 module_put(owner);
976err_lock:
977 mutex_unlock(&acpi_debugger.lock);
978 return ret;
979}
980
981int acpi_debugger_wait_command_ready(void)
982{
983 int ret;
984 int (*func)(bool, char *, size_t);
985 struct module *owner;
986
987 if (!acpi_debugger_initialized)
988 return -ENODEV;
989 mutex_lock(&acpi_debugger.lock);
990 if (!acpi_debugger.ops) {
991 ret = -ENODEV;
992 goto err_lock;
993 }
994 if (!try_module_get(acpi_debugger.owner)) {
995 ret = -ENODEV;
996 goto err_lock;
997 }
998 func = acpi_debugger.ops->wait_command_ready;
999 owner = acpi_debugger.owner;
1000 mutex_unlock(&acpi_debugger.lock);
1001
1002 ret = func(acpi_gbl_method_executing,
1003 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1004
1005 mutex_lock(&acpi_debugger.lock);
1006 module_put(owner);
1007err_lock:
1008 mutex_unlock(&acpi_debugger.lock);
1009 return ret;
1010}
1011
1012int acpi_debugger_notify_command_complete(void)
1013{
1014 int ret;
1015 int (*func)(void);
1016 struct module *owner;
1017
1018 if (!acpi_debugger_initialized)
1019 return -ENODEV;
1020 mutex_lock(&acpi_debugger.lock);
1021 if (!acpi_debugger.ops) {
1022 ret = -ENODEV;
1023 goto err_lock;
1024 }
1025 if (!try_module_get(acpi_debugger.owner)) {
1026 ret = -ENODEV;
1027 goto err_lock;
1028 }
1029 func = acpi_debugger.ops->notify_command_complete;
1030 owner = acpi_debugger.owner;
1031 mutex_unlock(&acpi_debugger.lock);
1032
1033 ret = func();
1034
1035 mutex_lock(&acpi_debugger.lock);
1036 module_put(owner);
1037err_lock:
1038 mutex_unlock(&acpi_debugger.lock);
1039 return ret;
1040}
1041
1042int __init acpi_debugger_init(void)
1043{
1044 mutex_init(&acpi_debugger.lock);
1045 acpi_debugger_initialized = true;
1046 return 0;
1047}
1048#endif
1049
1050/*******************************************************************************
1051 *
1052 * FUNCTION: acpi_os_execute
1053 *
1054 * PARAMETERS: Type - Type of the callback
1055 * Function - Function to be executed
1056 * Context - Function parameters
1057 *
1058 * RETURN: Status
1059 *
1060 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1061 * immediately executes function on a separate thread.
1062 *
1063 ******************************************************************************/
1064
1065acpi_status acpi_os_execute(acpi_execute_type type,
1066 acpi_osd_exec_callback function, void *context)
1067{
1068 acpi_status status = AE_OK;
1069 struct acpi_os_dpc *dpc;
1070 struct workqueue_struct *queue;
1071 int ret;
1072 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1073 "Scheduling function [%p(%p)] for deferred execution.\n",
1074 function, context));
1075
1076 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1077 ret = acpi_debugger_create_thread(function, context);
1078 if (ret) {
1079 pr_err("Call to kthread_create() failed.\n");
1080 status = AE_ERROR;
1081 }
1082 goto out_thread;
1083 }
1084
1085 /*
1086 * Allocate/initialize DPC structure. Note that this memory will be
1087 * freed by the callee. The kernel handles the work_struct list in a
1088 * way that allows us to also free its memory inside the callee.
1089 * Because we may want to schedule several tasks with different
1090 * parameters we can't use the approach some kernel code uses of
1091 * having a static work_struct.
1092 */
1093
1094 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1095 if (!dpc)
1096 return AE_NO_MEMORY;
1097
1098 dpc->function = function;
1099 dpc->context = context;
1100
1101 /*
1102 * To prevent lockdep from complaining unnecessarily, make sure that
1103 * there is a different static lockdep key for each workqueue by using
1104 * INIT_WORK() for each of them separately.
1105 */
1106 if (type == OSL_NOTIFY_HANDLER) {
1107 queue = kacpi_notify_wq;
1108 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1109 } else if (type == OSL_GPE_HANDLER) {
1110 queue = kacpid_wq;
1111 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1112 } else {
1113 pr_err("Unsupported os_execute type %d.\n", type);
1114 status = AE_ERROR;
1115 }
1116
1117 if (ACPI_FAILURE(status))
1118 goto err_workqueue;
1119
1120 /*
1121 * On some machines, a software-initiated SMI causes corruption unless
1122 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1123 * typically it's done in GPE-related methods that are run via
1124 * workqueues, so we can avoid the known corruption cases by always
1125 * queueing on CPU 0.
1126 */
1127 ret = queue_work_on(0, queue, &dpc->work);
1128 if (!ret) {
1129 printk(KERN_ERR PREFIX
1130 "Call to queue_work() failed.\n");
1131 status = AE_ERROR;
1132 }
1133err_workqueue:
1134 if (ACPI_FAILURE(status))
1135 kfree(dpc);
1136out_thread:
1137 return status;
1138}
1139EXPORT_SYMBOL(acpi_os_execute);
1140
1141void acpi_os_wait_events_complete(void)
1142{
1143 /*
1144 * Make sure the GPE handler or the fixed event handler is not used
1145 * on another CPU after removal.
1146 */
1147 if (acpi_sci_irq_valid())
1148 synchronize_hardirq(acpi_sci_irq);
1149 flush_workqueue(kacpid_wq);
1150 flush_workqueue(kacpi_notify_wq);
1151}
1152EXPORT_SYMBOL(acpi_os_wait_events_complete);
1153
1154struct acpi_hp_work {
1155 struct work_struct work;
1156 struct acpi_device *adev;
1157 u32 src;
1158};
1159
1160static void acpi_hotplug_work_fn(struct work_struct *work)
1161{
1162 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1163
1164 acpi_os_wait_events_complete();
1165 acpi_device_hotplug(hpw->adev, hpw->src);
1166 kfree(hpw);
1167}
1168
1169acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1170{
1171 struct acpi_hp_work *hpw;
1172
1173 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1174 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1175 adev, src));
1176
1177 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1178 if (!hpw)
1179 return AE_NO_MEMORY;
1180
1181 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1182 hpw->adev = adev;
1183 hpw->src = src;
1184 /*
1185 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1186 * the hotplug code may call driver .remove() functions, which may
1187 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1188 * these workqueues.
1189 */
1190 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1191 kfree(hpw);
1192 return AE_ERROR;
1193 }
1194 return AE_OK;
1195}
1196
1197bool acpi_queue_hotplug_work(struct work_struct *work)
1198{
1199 return queue_work(kacpi_hotplug_wq, work);
1200}
1201
1202acpi_status
1203acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1204{
1205 struct semaphore *sem = NULL;
1206
1207 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1208 if (!sem)
1209 return AE_NO_MEMORY;
1210
1211 sema_init(sem, initial_units);
1212
1213 *handle = (acpi_handle *) sem;
1214
1215 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1216 *handle, initial_units));
1217
1218 return AE_OK;
1219}
1220
1221/*
1222 * TODO: A better way to delete semaphores? Linux doesn't have a
1223 * 'delete_semaphore()' function -- may result in an invalid
1224 * pointer dereference for non-synchronized consumers. Should
1225 * we at least check for blocked threads and signal/cancel them?
1226 */
1227
1228acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1229{
1230 struct semaphore *sem = (struct semaphore *)handle;
1231
1232 if (!sem)
1233 return AE_BAD_PARAMETER;
1234
1235 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1236
1237 BUG_ON(!list_empty(&sem->wait_list));
1238 kfree(sem);
1239 sem = NULL;
1240
1241 return AE_OK;
1242}
1243
1244/*
1245 * TODO: Support for units > 1?
1246 */
1247acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1248{
1249 acpi_status status = AE_OK;
1250 struct semaphore *sem = (struct semaphore *)handle;
1251 long jiffies;
1252 int ret = 0;
1253
1254 if (!acpi_os_initialized)
1255 return AE_OK;
1256
1257 if (!sem || (units < 1))
1258 return AE_BAD_PARAMETER;
1259
1260 if (units > 1)
1261 return AE_SUPPORT;
1262
1263 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1264 handle, units, timeout));
1265
1266 if (timeout == ACPI_WAIT_FOREVER)
1267 jiffies = MAX_SCHEDULE_TIMEOUT;
1268 else
1269 jiffies = msecs_to_jiffies(timeout);
1270
1271 ret = down_timeout(sem, jiffies);
1272 if (ret)
1273 status = AE_TIME;
1274
1275 if (ACPI_FAILURE(status)) {
1276 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1277 "Failed to acquire semaphore[%p|%d|%d], %s",
1278 handle, units, timeout,
1279 acpi_format_exception(status)));
1280 } else {
1281 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1282 "Acquired semaphore[%p|%d|%d]", handle,
1283 units, timeout));
1284 }
1285
1286 return status;
1287}
1288
1289/*
1290 * TODO: Support for units > 1?
1291 */
1292acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1293{
1294 struct semaphore *sem = (struct semaphore *)handle;
1295
1296 if (!acpi_os_initialized)
1297 return AE_OK;
1298
1299 if (!sem || (units < 1))
1300 return AE_BAD_PARAMETER;
1301
1302 if (units > 1)
1303 return AE_SUPPORT;
1304
1305 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1306 units));
1307
1308 up(sem);
1309
1310 return AE_OK;
1311}
1312
1313acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1314{
1315#ifdef ENABLE_DEBUGGER
1316 if (acpi_in_debugger) {
1317 u32 chars;
1318
1319 kdb_read(buffer, buffer_length);
1320
1321 /* remove the CR kdb includes */
1322 chars = strlen(buffer) - 1;
1323 buffer[chars] = '\0';
1324 }
1325#else
1326 int ret;
1327
1328 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1329 if (ret < 0)
1330 return AE_ERROR;
1331 if (bytes_read)
1332 *bytes_read = ret;
1333#endif
1334
1335 return AE_OK;
1336}
1337EXPORT_SYMBOL(acpi_os_get_line);
1338
1339acpi_status acpi_os_wait_command_ready(void)
1340{
1341 int ret;
1342
1343 ret = acpi_debugger_wait_command_ready();
1344 if (ret < 0)
1345 return AE_ERROR;
1346 return AE_OK;
1347}
1348
1349acpi_status acpi_os_notify_command_complete(void)
1350{
1351 int ret;
1352
1353 ret = acpi_debugger_notify_command_complete();
1354 if (ret < 0)
1355 return AE_ERROR;
1356 return AE_OK;
1357}
1358
1359acpi_status acpi_os_signal(u32 function, void *info)
1360{
1361 switch (function) {
1362 case ACPI_SIGNAL_FATAL:
1363 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1364 break;
1365 case ACPI_SIGNAL_BREAKPOINT:
1366 /*
1367 * AML Breakpoint
1368 * ACPI spec. says to treat it as a NOP unless
1369 * you are debugging. So if/when we integrate
1370 * AML debugger into the kernel debugger its
1371 * hook will go here. But until then it is
1372 * not useful to print anything on breakpoints.
1373 */
1374 break;
1375 default:
1376 break;
1377 }
1378
1379 return AE_OK;
1380}
1381
1382static int __init acpi_os_name_setup(char *str)
1383{
1384 char *p = acpi_os_name;
1385 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1386
1387 if (!str || !*str)
1388 return 0;
1389
1390 for (; count-- && *str; str++) {
1391 if (isalnum(*str) || *str == ' ' || *str == ':')
1392 *p++ = *str;
1393 else if (*str == '\'' || *str == '"')
1394 continue;
1395 else
1396 break;
1397 }
1398 *p = 0;
1399
1400 return 1;
1401
1402}
1403
1404__setup("acpi_os_name=", acpi_os_name_setup);
1405
1406/*
1407 * Disable the auto-serialization of named objects creation methods.
1408 *
1409 * This feature is enabled by default. It marks the AML control methods
1410 * that contain the opcodes to create named objects as "Serialized".
1411 */
1412static int __init acpi_no_auto_serialize_setup(char *str)
1413{
1414 acpi_gbl_auto_serialize_methods = FALSE;
1415 pr_info("ACPI: auto-serialization disabled\n");
1416
1417 return 1;
1418}
1419
1420__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1421
1422/* Check of resource interference between native drivers and ACPI
1423 * OperationRegions (SystemIO and System Memory only).
1424 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1425 * in arbitrary AML code and can interfere with legacy drivers.
1426 * acpi_enforce_resources= can be set to:
1427 *
1428 * - strict (default) (2)
1429 * -> further driver trying to access the resources will not load
1430 * - lax (1)
1431 * -> further driver trying to access the resources will load, but you
1432 * get a system message that something might go wrong...
1433 *
1434 * - no (0)
1435 * -> ACPI Operation Region resources will not be registered
1436 *
1437 */
1438#define ENFORCE_RESOURCES_STRICT 2
1439#define ENFORCE_RESOURCES_LAX 1
1440#define ENFORCE_RESOURCES_NO 0
1441
1442static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1443
1444static int __init acpi_enforce_resources_setup(char *str)
1445{
1446 if (str == NULL || *str == '\0')
1447 return 0;
1448
1449 if (!strcmp("strict", str))
1450 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1451 else if (!strcmp("lax", str))
1452 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1453 else if (!strcmp("no", str))
1454 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1455
1456 return 1;
1457}
1458
1459__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1460
1461/* Check for resource conflicts between ACPI OperationRegions and native
1462 * drivers */
1463int acpi_check_resource_conflict(const struct resource *res)
1464{
1465 acpi_adr_space_type space_id;
1466 acpi_size length;
1467 u8 warn = 0;
1468 int clash = 0;
1469
1470 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1471 return 0;
1472 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1473 return 0;
1474
1475 if (res->flags & IORESOURCE_IO)
1476 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1477 else
1478 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1479
1480 length = resource_size(res);
1481 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1482 warn = 1;
1483 clash = acpi_check_address_range(space_id, res->start, length, warn);
1484
1485 if (clash) {
1486 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1487 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1488 printk(KERN_NOTICE "ACPI: This conflict may"
1489 " cause random problems and system"
1490 " instability\n");
1491 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1492 " for this device, you should use it instead of"
1493 " the native driver\n");
1494 }
1495 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1496 return -EBUSY;
1497 }
1498 return 0;
1499}
1500EXPORT_SYMBOL(acpi_check_resource_conflict);
1501
1502int acpi_check_region(resource_size_t start, resource_size_t n,
1503 const char *name)
1504{
1505 struct resource res = {
1506 .start = start,
1507 .end = start + n - 1,
1508 .name = name,
1509 .flags = IORESOURCE_IO,
1510 };
1511
1512 return acpi_check_resource_conflict(&res);
1513}
1514EXPORT_SYMBOL(acpi_check_region);
1515
1516static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1517 void *_res, void **return_value)
1518{
1519 struct acpi_mem_space_context **mem_ctx;
1520 union acpi_operand_object *handler_obj;
1521 union acpi_operand_object *region_obj2;
1522 union acpi_operand_object *region_obj;
1523 struct resource *res = _res;
1524 acpi_status status;
1525
1526 region_obj = acpi_ns_get_attached_object(handle);
1527 if (!region_obj)
1528 return AE_OK;
1529
1530 handler_obj = region_obj->region.handler;
1531 if (!handler_obj)
1532 return AE_OK;
1533
1534 if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1535 return AE_OK;
1536
1537 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1538 return AE_OK;
1539
1540 region_obj2 = acpi_ns_get_secondary_object(region_obj);
1541 if (!region_obj2)
1542 return AE_OK;
1543
1544 mem_ctx = (void *)®ion_obj2->extra.region_context;
1545
1546 if (!(mem_ctx[0]->address >= res->start &&
1547 mem_ctx[0]->address < res->end))
1548 return AE_OK;
1549
1550 status = handler_obj->address_space.setup(region_obj,
1551 ACPI_REGION_DEACTIVATE,
1552 NULL, (void **)mem_ctx);
1553 if (ACPI_SUCCESS(status))
1554 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1555
1556 return status;
1557}
1558
1559/**
1560 * acpi_release_memory - Release any mappings done to a memory region
1561 * @handle: Handle to namespace node
1562 * @res: Memory resource
1563 * @level: A level that terminates the search
1564 *
1565 * Walks through @handle and unmaps all SystemMemory Operation Regions that
1566 * overlap with @res and that have already been activated (mapped).
1567 *
1568 * This is a helper that allows drivers to place special requirements on memory
1569 * region that may overlap with operation regions, primarily allowing them to
1570 * safely map the region as non-cached memory.
1571 *
1572 * The unmapped Operation Regions will be automatically remapped next time they
1573 * are called, so the drivers do not need to do anything else.
1574 */
1575acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1576 u32 level)
1577{
1578 acpi_status status;
1579
1580 if (!(res->flags & IORESOURCE_MEM))
1581 return AE_TYPE;
1582
1583 status = acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1584 acpi_deactivate_mem_region, NULL,
1585 res, NULL);
1586 if (ACPI_FAILURE(status))
1587 return status;
1588
1589 /*
1590 * Wait for all of the mappings queued up for removal by
1591 * acpi_deactivate_mem_region() to actually go away.
1592 */
1593 synchronize_rcu();
1594 rcu_barrier();
1595 flush_scheduled_work();
1596
1597 return AE_OK;
1598}
1599EXPORT_SYMBOL_GPL(acpi_release_memory);
1600
1601/*
1602 * Let drivers know whether the resource checks are effective
1603 */
1604int acpi_resources_are_enforced(void)
1605{
1606 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1607}
1608EXPORT_SYMBOL(acpi_resources_are_enforced);
1609
1610/*
1611 * Deallocate the memory for a spinlock.
1612 */
1613void acpi_os_delete_lock(acpi_spinlock handle)
1614{
1615 ACPI_FREE(handle);
1616}
1617
1618/*
1619 * Acquire a spinlock.
1620 *
1621 * handle is a pointer to the spinlock_t.
1622 */
1623
1624acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1625 __acquires(lockp)
1626{
1627 acpi_cpu_flags flags;
1628 spin_lock_irqsave(lockp, flags);
1629 return flags;
1630}
1631
1632/*
1633 * Release a spinlock. See above.
1634 */
1635
1636void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1637 __releases(lockp)
1638{
1639 spin_unlock_irqrestore(lockp, flags);
1640}
1641
1642#ifndef ACPI_USE_LOCAL_CACHE
1643
1644/*******************************************************************************
1645 *
1646 * FUNCTION: acpi_os_create_cache
1647 *
1648 * PARAMETERS: name - Ascii name for the cache
1649 * size - Size of each cached object
1650 * depth - Maximum depth of the cache (in objects) <ignored>
1651 * cache - Where the new cache object is returned
1652 *
1653 * RETURN: status
1654 *
1655 * DESCRIPTION: Create a cache object
1656 *
1657 ******************************************************************************/
1658
1659acpi_status
1660acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1661{
1662 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1663 if (*cache == NULL)
1664 return AE_ERROR;
1665 else
1666 return AE_OK;
1667}
1668
1669/*******************************************************************************
1670 *
1671 * FUNCTION: acpi_os_purge_cache
1672 *
1673 * PARAMETERS: Cache - Handle to cache object
1674 *
1675 * RETURN: Status
1676 *
1677 * DESCRIPTION: Free all objects within the requested cache.
1678 *
1679 ******************************************************************************/
1680
1681acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1682{
1683 kmem_cache_shrink(cache);
1684 return (AE_OK);
1685}
1686
1687/*******************************************************************************
1688 *
1689 * FUNCTION: acpi_os_delete_cache
1690 *
1691 * PARAMETERS: Cache - Handle to cache object
1692 *
1693 * RETURN: Status
1694 *
1695 * DESCRIPTION: Free all objects within the requested cache and delete the
1696 * cache object.
1697 *
1698 ******************************************************************************/
1699
1700acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1701{
1702 kmem_cache_destroy(cache);
1703 return (AE_OK);
1704}
1705
1706/*******************************************************************************
1707 *
1708 * FUNCTION: acpi_os_release_object
1709 *
1710 * PARAMETERS: Cache - Handle to cache object
1711 * Object - The object to be released
1712 *
1713 * RETURN: None
1714 *
1715 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1716 * the object is deleted.
1717 *
1718 ******************************************************************************/
1719
1720acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1721{
1722 kmem_cache_free(cache, object);
1723 return (AE_OK);
1724}
1725#endif
1726
1727static int __init acpi_no_static_ssdt_setup(char *s)
1728{
1729 acpi_gbl_disable_ssdt_table_install = TRUE;
1730 pr_info("ACPI: static SSDT installation disabled\n");
1731
1732 return 0;
1733}
1734
1735early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1736
1737static int __init acpi_disable_return_repair(char *s)
1738{
1739 printk(KERN_NOTICE PREFIX
1740 "ACPI: Predefined validation mechanism disabled\n");
1741 acpi_gbl_disable_auto_repair = TRUE;
1742
1743 return 1;
1744}
1745
1746__setup("acpica_no_return_repair", acpi_disable_return_repair);
1747
1748acpi_status __init acpi_os_initialize(void)
1749{
1750 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1751 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1752 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1753 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1754 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1755 /*
1756 * Use acpi_os_map_generic_address to pre-map the reset
1757 * register if it's in system memory.
1758 */
1759 int rv;
1760
1761 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1762 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1763 }
1764 acpi_os_initialized = true;
1765
1766 return AE_OK;
1767}
1768
1769acpi_status __init acpi_os_initialize1(void)
1770{
1771 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1772 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1773 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1774 BUG_ON(!kacpid_wq);
1775 BUG_ON(!kacpi_notify_wq);
1776 BUG_ON(!kacpi_hotplug_wq);
1777 acpi_osi_init();
1778 return AE_OK;
1779}
1780
1781acpi_status acpi_os_terminate(void)
1782{
1783 if (acpi_irq_handler) {
1784 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1785 acpi_irq_handler);
1786 }
1787
1788 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1789 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1790 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1791 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1792 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1793 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1794
1795 destroy_workqueue(kacpid_wq);
1796 destroy_workqueue(kacpi_notify_wq);
1797 destroy_workqueue(kacpi_hotplug_wq);
1798
1799 return AE_OK;
1800}
1801
1802acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1803 u32 pm1b_control)
1804{
1805 int rc = 0;
1806 if (__acpi_os_prepare_sleep)
1807 rc = __acpi_os_prepare_sleep(sleep_state,
1808 pm1a_control, pm1b_control);
1809 if (rc < 0)
1810 return AE_ERROR;
1811 else if (rc > 0)
1812 return AE_CTRL_TERMINATE;
1813
1814 return AE_OK;
1815}
1816
1817void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1818 u32 pm1a_ctrl, u32 pm1b_ctrl))
1819{
1820 __acpi_os_prepare_sleep = func;
1821}
1822
1823#if (ACPI_REDUCED_HARDWARE)
1824acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1825 u32 val_b)
1826{
1827 int rc = 0;
1828 if (__acpi_os_prepare_extended_sleep)
1829 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1830 val_a, val_b);
1831 if (rc < 0)
1832 return AE_ERROR;
1833 else if (rc > 0)
1834 return AE_CTRL_TERMINATE;
1835
1836 return AE_OK;
1837}
1838#else
1839acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1840 u32 val_b)
1841{
1842 return AE_OK;
1843}
1844#endif
1845
1846void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1847 u32 val_a, u32 val_b))
1848{
1849 __acpi_os_prepare_extended_sleep = func;
1850}
1851
1852acpi_status acpi_os_enter_sleep(u8 sleep_state,
1853 u32 reg_a_value, u32 reg_b_value)
1854{
1855 acpi_status status;
1856
1857 if (acpi_gbl_reduced_hardware)
1858 status = acpi_os_prepare_extended_sleep(sleep_state,
1859 reg_a_value,
1860 reg_b_value);
1861 else
1862 status = acpi_os_prepare_sleep(sleep_state,
1863 reg_a_value, reg_b_value);
1864 return status;
1865}
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/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/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 "internal.h"
52
53#define _COMPONENT ACPI_OS_SERVICES
54ACPI_MODULE_NAME("osl");
55
56struct acpi_os_dpc {
57 acpi_osd_exec_callback function;
58 void *context;
59 struct work_struct work;
60};
61
62#ifdef CONFIG_ACPI_CUSTOM_DSDT
63#include CONFIG_ACPI_CUSTOM_DSDT_FILE
64#endif
65
66#ifdef ENABLE_DEBUGGER
67#include <linux/kdb.h>
68
69/* stuff for debugger support */
70int acpi_in_debugger;
71EXPORT_SYMBOL(acpi_in_debugger);
72
73extern char line_buf[80];
74#endif /*ENABLE_DEBUGGER */
75
76static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
77 u32 pm1b_ctrl);
78static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
79 u32 val_b);
80
81static acpi_osd_handler acpi_irq_handler;
82static void *acpi_irq_context;
83static struct workqueue_struct *kacpid_wq;
84static struct workqueue_struct *kacpi_notify_wq;
85static struct workqueue_struct *kacpi_hotplug_wq;
86
87/*
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
90 */
91struct acpi_ioremap {
92 struct list_head list;
93 void __iomem *virt;
94 acpi_physical_address phys;
95 acpi_size size;
96 unsigned long refcount;
97};
98
99static LIST_HEAD(acpi_ioremaps);
100static DEFINE_MUTEX(acpi_ioremap_lock);
101
102static void __init acpi_osi_setup_late(void);
103
104/*
105 * The story of _OSI(Linux)
106 *
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
109 *
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
114 *
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
126 *
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
129 *
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
135 */
136
137static struct osi_linux {
138 unsigned int enable:1;
139 unsigned int dmi:1;
140 unsigned int cmdline:1;
141 unsigned int default_disabling:1;
142} osi_linux = {0, 0, 0, 0};
143
144static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145{
146 if (!strcmp("Linux", interface)) {
147
148 printk_once(KERN_NOTICE FW_BUG PREFIX
149 "BIOS _OSI(Linux) query %s%s\n",
150 osi_linux.enable ? "honored" : "ignored",
151 osi_linux.cmdline ? " via cmdline" :
152 osi_linux.dmi ? " via DMI" : "");
153 }
154
155 return supported;
156}
157
158static void __init acpi_request_region (struct acpi_generic_address *gas,
159 unsigned int length, char *desc)
160{
161 u64 addr;
162
163 /* Handle possible alignment issues */
164 memcpy(&addr, &gas->address, sizeof(addr));
165 if (!addr || !length)
166 return;
167
168 /* Resources are never freed */
169 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
170 request_region(addr, length, desc);
171 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
172 request_mem_region(addr, length, desc);
173}
174
175static int __init acpi_reserve_resources(void)
176{
177 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
178 "ACPI PM1a_EVT_BLK");
179
180 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
181 "ACPI PM1b_EVT_BLK");
182
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
184 "ACPI PM1a_CNT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
187 "ACPI PM1b_CNT_BLK");
188
189 if (acpi_gbl_FADT.pm_timer_length == 4)
190 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
193 "ACPI PM2_CNT_BLK");
194
195 /* Length of GPE blocks must be a non-negative multiple of 2 */
196
197 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
198 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
199 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200
201 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
202 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
203 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
204
205 return 0;
206}
207device_initcall(acpi_reserve_resources);
208
209void acpi_os_printf(const char *fmt, ...)
210{
211 va_list args;
212 va_start(args, fmt);
213 acpi_os_vprintf(fmt, args);
214 va_end(args);
215}
216
217void acpi_os_vprintf(const char *fmt, va_list args)
218{
219 static char buffer[512];
220
221 vsprintf(buffer, fmt, args);
222
223#ifdef ENABLE_DEBUGGER
224 if (acpi_in_debugger) {
225 kdb_printf("%s", buffer);
226 } else {
227 printk(KERN_CONT "%s", buffer);
228 }
229#else
230 printk(KERN_CONT "%s", buffer);
231#endif
232}
233
234#ifdef CONFIG_KEXEC
235static unsigned long acpi_rsdp;
236static int __init setup_acpi_rsdp(char *arg)
237{
238 acpi_rsdp = simple_strtoul(arg, NULL, 16);
239 return 0;
240}
241early_param("acpi_rsdp", setup_acpi_rsdp);
242#endif
243
244acpi_physical_address __init acpi_os_get_root_pointer(void)
245{
246#ifdef CONFIG_KEXEC
247 if (acpi_rsdp)
248 return acpi_rsdp;
249#endif
250
251 if (efi_enabled(EFI_CONFIG_TABLES)) {
252 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
253 return efi.acpi20;
254 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
255 return efi.acpi;
256 else {
257 printk(KERN_ERR PREFIX
258 "System description tables not found\n");
259 return 0;
260 }
261 } else {
262 acpi_physical_address pa = 0;
263
264 acpi_find_root_pointer(&pa);
265 return pa;
266 }
267}
268
269/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
270static struct acpi_ioremap *
271acpi_map_lookup(acpi_physical_address phys, acpi_size size)
272{
273 struct acpi_ioremap *map;
274
275 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
276 if (map->phys <= phys &&
277 phys + size <= map->phys + map->size)
278 return map;
279
280 return NULL;
281}
282
283/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
284static void __iomem *
285acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
286{
287 struct acpi_ioremap *map;
288
289 map = acpi_map_lookup(phys, size);
290 if (map)
291 return map->virt + (phys - map->phys);
292
293 return NULL;
294}
295
296void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
297{
298 struct acpi_ioremap *map;
299 void __iomem *virt = NULL;
300
301 mutex_lock(&acpi_ioremap_lock);
302 map = acpi_map_lookup(phys, size);
303 if (map) {
304 virt = map->virt + (phys - map->phys);
305 map->refcount++;
306 }
307 mutex_unlock(&acpi_ioremap_lock);
308 return virt;
309}
310EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
311
312/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
313static struct acpi_ioremap *
314acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
315{
316 struct acpi_ioremap *map;
317
318 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
319 if (map->virt <= virt &&
320 virt + size <= map->virt + map->size)
321 return map;
322
323 return NULL;
324}
325
326#ifndef CONFIG_IA64
327#define should_use_kmap(pfn) page_is_ram(pfn)
328#else
329/* ioremap will take care of cache attributes */
330#define should_use_kmap(pfn) 0
331#endif
332
333static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
334{
335 unsigned long pfn;
336
337 pfn = pg_off >> PAGE_SHIFT;
338 if (should_use_kmap(pfn)) {
339 if (pg_sz > PAGE_SIZE)
340 return NULL;
341 return (void __iomem __force *)kmap(pfn_to_page(pfn));
342 } else
343 return acpi_os_ioremap(pg_off, pg_sz);
344}
345
346static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
347{
348 unsigned long pfn;
349
350 pfn = pg_off >> PAGE_SHIFT;
351 if (should_use_kmap(pfn))
352 kunmap(pfn_to_page(pfn));
353 else
354 iounmap(vaddr);
355}
356
357void __iomem *__init_refok
358acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
359{
360 struct acpi_ioremap *map;
361 void __iomem *virt;
362 acpi_physical_address pg_off;
363 acpi_size pg_sz;
364
365 if (phys > ULONG_MAX) {
366 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
367 return NULL;
368 }
369
370 if (!acpi_gbl_permanent_mmap)
371 return __acpi_map_table((unsigned long)phys, size);
372
373 mutex_lock(&acpi_ioremap_lock);
374 /* Check if there's a suitable mapping already. */
375 map = acpi_map_lookup(phys, size);
376 if (map) {
377 map->refcount++;
378 goto out;
379 }
380
381 map = kzalloc(sizeof(*map), GFP_KERNEL);
382 if (!map) {
383 mutex_unlock(&acpi_ioremap_lock);
384 return NULL;
385 }
386
387 pg_off = round_down(phys, PAGE_SIZE);
388 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
389 virt = acpi_map(pg_off, pg_sz);
390 if (!virt) {
391 mutex_unlock(&acpi_ioremap_lock);
392 kfree(map);
393 return NULL;
394 }
395
396 INIT_LIST_HEAD(&map->list);
397 map->virt = virt;
398 map->phys = pg_off;
399 map->size = pg_sz;
400 map->refcount = 1;
401
402 list_add_tail_rcu(&map->list, &acpi_ioremaps);
403
404 out:
405 mutex_unlock(&acpi_ioremap_lock);
406 return map->virt + (phys - map->phys);
407}
408EXPORT_SYMBOL_GPL(acpi_os_map_memory);
409
410static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
411{
412 if (!--map->refcount)
413 list_del_rcu(&map->list);
414}
415
416static void acpi_os_map_cleanup(struct acpi_ioremap *map)
417{
418 if (!map->refcount) {
419 synchronize_rcu();
420 acpi_unmap(map->phys, map->virt);
421 kfree(map);
422 }
423}
424
425void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
426{
427 struct acpi_ioremap *map;
428
429 if (!acpi_gbl_permanent_mmap) {
430 __acpi_unmap_table(virt, size);
431 return;
432 }
433
434 mutex_lock(&acpi_ioremap_lock);
435 map = acpi_map_lookup_virt(virt, size);
436 if (!map) {
437 mutex_unlock(&acpi_ioremap_lock);
438 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
439 return;
440 }
441 acpi_os_drop_map_ref(map);
442 mutex_unlock(&acpi_ioremap_lock);
443
444 acpi_os_map_cleanup(map);
445}
446EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
447
448void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
449{
450 if (!acpi_gbl_permanent_mmap)
451 __acpi_unmap_table(virt, size);
452}
453
454int acpi_os_map_generic_address(struct acpi_generic_address *gas)
455{
456 u64 addr;
457 void __iomem *virt;
458
459 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
460 return 0;
461
462 /* Handle possible alignment issues */
463 memcpy(&addr, &gas->address, sizeof(addr));
464 if (!addr || !gas->bit_width)
465 return -EINVAL;
466
467 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
468 if (!virt)
469 return -EIO;
470
471 return 0;
472}
473EXPORT_SYMBOL(acpi_os_map_generic_address);
474
475void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
476{
477 u64 addr;
478 struct acpi_ioremap *map;
479
480 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
481 return;
482
483 /* Handle possible alignment issues */
484 memcpy(&addr, &gas->address, sizeof(addr));
485 if (!addr || !gas->bit_width)
486 return;
487
488 mutex_lock(&acpi_ioremap_lock);
489 map = acpi_map_lookup(addr, gas->bit_width / 8);
490 if (!map) {
491 mutex_unlock(&acpi_ioremap_lock);
492 return;
493 }
494 acpi_os_drop_map_ref(map);
495 mutex_unlock(&acpi_ioremap_lock);
496
497 acpi_os_map_cleanup(map);
498}
499EXPORT_SYMBOL(acpi_os_unmap_generic_address);
500
501#ifdef ACPI_FUTURE_USAGE
502acpi_status
503acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
504{
505 if (!phys || !virt)
506 return AE_BAD_PARAMETER;
507
508 *phys = virt_to_phys(virt);
509
510 return AE_OK;
511}
512#endif
513
514#define ACPI_MAX_OVERRIDE_LEN 100
515
516static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
517
518acpi_status
519acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
520 acpi_string * new_val)
521{
522 if (!init_val || !new_val)
523 return AE_BAD_PARAMETER;
524
525 *new_val = NULL;
526 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
527 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
528 acpi_os_name);
529 *new_val = acpi_os_name;
530 }
531
532 return AE_OK;
533}
534
535#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
536#include <linux/earlycpio.h>
537#include <linux/memblock.h>
538
539static u64 acpi_tables_addr;
540static int all_tables_size;
541
542/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
543static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
544{
545 u8 sum = 0;
546 u8 *end = buffer + length;
547
548 while (buffer < end)
549 sum = (u8) (sum + *(buffer++));
550 return sum;
551}
552
553/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
554static const char * const table_sigs[] = {
555 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
556 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
557 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
558 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
559 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
560 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
561 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
562 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
563 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
564
565#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
566
567#define ACPI_OVERRIDE_TABLES 64
568static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
569
570#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
571
572void __init acpi_initrd_override(void *data, size_t size)
573{
574 int sig, no, table_nr = 0, total_offset = 0;
575 long offset = 0;
576 struct acpi_table_header *table;
577 char cpio_path[32] = "kernel/firmware/acpi/";
578 struct cpio_data file;
579
580 if (data == NULL || size == 0)
581 return;
582
583 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
584 file = find_cpio_data(cpio_path, data, size, &offset);
585 if (!file.data)
586 break;
587
588 data += offset;
589 size -= offset;
590
591 if (file.size < sizeof(struct acpi_table_header)) {
592 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
593 cpio_path, file.name);
594 continue;
595 }
596
597 table = file.data;
598
599 for (sig = 0; table_sigs[sig]; sig++)
600 if (!memcmp(table->signature, table_sigs[sig], 4))
601 break;
602
603 if (!table_sigs[sig]) {
604 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
605 cpio_path, file.name);
606 continue;
607 }
608 if (file.size != table->length) {
609 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
610 cpio_path, file.name);
611 continue;
612 }
613 if (acpi_table_checksum(file.data, table->length)) {
614 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
615 cpio_path, file.name);
616 continue;
617 }
618
619 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
620 table->signature, cpio_path, file.name, table->length);
621
622 all_tables_size += table->length;
623 acpi_initrd_files[table_nr].data = file.data;
624 acpi_initrd_files[table_nr].size = file.size;
625 table_nr++;
626 }
627 if (table_nr == 0)
628 return;
629
630 acpi_tables_addr =
631 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
632 all_tables_size, PAGE_SIZE);
633 if (!acpi_tables_addr) {
634 WARN_ON(1);
635 return;
636 }
637 /*
638 * Only calling e820_add_reserve does not work and the
639 * tables are invalid (memory got used) later.
640 * memblock_reserve works as expected and the tables won't get modified.
641 * But it's not enough on X86 because ioremap will
642 * complain later (used by acpi_os_map_memory) that the pages
643 * that should get mapped are not marked "reserved".
644 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
645 * works fine.
646 */
647 memblock_reserve(acpi_tables_addr, all_tables_size);
648 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
649
650 /*
651 * early_ioremap only can remap 256k one time. If we map all
652 * tables one time, we will hit the limit. Need to map chunks
653 * one by one during copying the same as that in relocate_initrd().
654 */
655 for (no = 0; no < table_nr; no++) {
656 unsigned char *src_p = acpi_initrd_files[no].data;
657 phys_addr_t size = acpi_initrd_files[no].size;
658 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
659 phys_addr_t slop, clen;
660 char *dest_p;
661
662 total_offset += size;
663
664 while (size) {
665 slop = dest_addr & ~PAGE_MASK;
666 clen = size;
667 if (clen > MAP_CHUNK_SIZE - slop)
668 clen = MAP_CHUNK_SIZE - slop;
669 dest_p = early_ioremap(dest_addr & PAGE_MASK,
670 clen + slop);
671 memcpy(dest_p + slop, src_p, clen);
672 early_iounmap(dest_p, clen + slop);
673 src_p += clen;
674 dest_addr += clen;
675 size -= clen;
676 }
677 }
678}
679#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
680
681static void acpi_table_taint(struct acpi_table_header *table)
682{
683 pr_warn(PREFIX
684 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
685 table->signature, table->oem_table_id);
686 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
687}
688
689
690acpi_status
691acpi_os_table_override(struct acpi_table_header * existing_table,
692 struct acpi_table_header ** new_table)
693{
694 if (!existing_table || !new_table)
695 return AE_BAD_PARAMETER;
696
697 *new_table = NULL;
698
699#ifdef CONFIG_ACPI_CUSTOM_DSDT
700 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
701 *new_table = (struct acpi_table_header *)AmlCode;
702#endif
703 if (*new_table != NULL)
704 acpi_table_taint(existing_table);
705 return AE_OK;
706}
707
708acpi_status
709acpi_os_physical_table_override(struct acpi_table_header *existing_table,
710 acpi_physical_address *address,
711 u32 *table_length)
712{
713#ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
714 *table_length = 0;
715 *address = 0;
716 return AE_OK;
717#else
718 int table_offset = 0;
719 struct acpi_table_header *table;
720
721 *table_length = 0;
722 *address = 0;
723
724 if (!acpi_tables_addr)
725 return AE_OK;
726
727 do {
728 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
729 WARN_ON(1);
730 return AE_OK;
731 }
732
733 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
734 ACPI_HEADER_SIZE);
735
736 if (table_offset + table->length > all_tables_size) {
737 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
738 WARN_ON(1);
739 return AE_OK;
740 }
741
742 table_offset += table->length;
743
744 if (memcmp(existing_table->signature, table->signature, 4)) {
745 acpi_os_unmap_memory(table,
746 ACPI_HEADER_SIZE);
747 continue;
748 }
749
750 /* Only override tables with matching oem id */
751 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
752 ACPI_OEM_TABLE_ID_SIZE)) {
753 acpi_os_unmap_memory(table,
754 ACPI_HEADER_SIZE);
755 continue;
756 }
757
758 table_offset -= table->length;
759 *table_length = table->length;
760 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
761 *address = acpi_tables_addr + table_offset;
762 break;
763 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
764
765 if (*address != 0)
766 acpi_table_taint(existing_table);
767 return AE_OK;
768#endif
769}
770
771static irqreturn_t acpi_irq(int irq, void *dev_id)
772{
773 u32 handled;
774
775 handled = (*acpi_irq_handler) (acpi_irq_context);
776
777 if (handled) {
778 acpi_irq_handled++;
779 return IRQ_HANDLED;
780 } else {
781 acpi_irq_not_handled++;
782 return IRQ_NONE;
783 }
784}
785
786acpi_status
787acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
788 void *context)
789{
790 unsigned int irq;
791
792 acpi_irq_stats_init();
793
794 /*
795 * ACPI interrupts different from the SCI in our copy of the FADT are
796 * not supported.
797 */
798 if (gsi != acpi_gbl_FADT.sci_interrupt)
799 return AE_BAD_PARAMETER;
800
801 if (acpi_irq_handler)
802 return AE_ALREADY_ACQUIRED;
803
804 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
805 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
806 gsi);
807 return AE_OK;
808 }
809
810 acpi_irq_handler = handler;
811 acpi_irq_context = context;
812 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
813 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
814 acpi_irq_handler = NULL;
815 return AE_NOT_ACQUIRED;
816 }
817
818 return AE_OK;
819}
820
821acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
822{
823 if (irq != acpi_gbl_FADT.sci_interrupt)
824 return AE_BAD_PARAMETER;
825
826 free_irq(irq, acpi_irq);
827 acpi_irq_handler = NULL;
828
829 return AE_OK;
830}
831
832/*
833 * Running in interpreter thread context, safe to sleep
834 */
835
836void acpi_os_sleep(u64 ms)
837{
838 msleep(ms);
839}
840
841void acpi_os_stall(u32 us)
842{
843 while (us) {
844 u32 delay = 1000;
845
846 if (delay > us)
847 delay = us;
848 udelay(delay);
849 touch_nmi_watchdog();
850 us -= delay;
851 }
852}
853
854/*
855 * Support ACPI 3.0 AML Timer operand
856 * Returns 64-bit free-running, monotonically increasing timer
857 * with 100ns granularity
858 */
859u64 acpi_os_get_timer(void)
860{
861 u64 time_ns = ktime_to_ns(ktime_get());
862 do_div(time_ns, 100);
863 return time_ns;
864}
865
866acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
867{
868 u32 dummy;
869
870 if (!value)
871 value = &dummy;
872
873 *value = 0;
874 if (width <= 8) {
875 *(u8 *) value = inb(port);
876 } else if (width <= 16) {
877 *(u16 *) value = inw(port);
878 } else if (width <= 32) {
879 *(u32 *) value = inl(port);
880 } else {
881 BUG();
882 }
883
884 return AE_OK;
885}
886
887EXPORT_SYMBOL(acpi_os_read_port);
888
889acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
890{
891 if (width <= 8) {
892 outb(value, port);
893 } else if (width <= 16) {
894 outw(value, port);
895 } else if (width <= 32) {
896 outl(value, port);
897 } else {
898 BUG();
899 }
900
901 return AE_OK;
902}
903
904EXPORT_SYMBOL(acpi_os_write_port);
905
906#ifdef readq
907static inline u64 read64(const volatile void __iomem *addr)
908{
909 return readq(addr);
910}
911#else
912static inline u64 read64(const volatile void __iomem *addr)
913{
914 u64 l, h;
915 l = readl(addr);
916 h = readl(addr+4);
917 return l | (h << 32);
918}
919#endif
920
921acpi_status
922acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
923{
924 void __iomem *virt_addr;
925 unsigned int size = width / 8;
926 bool unmap = false;
927 u64 dummy;
928
929 rcu_read_lock();
930 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
931 if (!virt_addr) {
932 rcu_read_unlock();
933 virt_addr = acpi_os_ioremap(phys_addr, size);
934 if (!virt_addr)
935 return AE_BAD_ADDRESS;
936 unmap = true;
937 }
938
939 if (!value)
940 value = &dummy;
941
942 switch (width) {
943 case 8:
944 *(u8 *) value = readb(virt_addr);
945 break;
946 case 16:
947 *(u16 *) value = readw(virt_addr);
948 break;
949 case 32:
950 *(u32 *) value = readl(virt_addr);
951 break;
952 case 64:
953 *(u64 *) value = read64(virt_addr);
954 break;
955 default:
956 BUG();
957 }
958
959 if (unmap)
960 iounmap(virt_addr);
961 else
962 rcu_read_unlock();
963
964 return AE_OK;
965}
966
967#ifdef writeq
968static inline void write64(u64 val, volatile void __iomem *addr)
969{
970 writeq(val, addr);
971}
972#else
973static inline void write64(u64 val, volatile void __iomem *addr)
974{
975 writel(val, addr);
976 writel(val>>32, addr+4);
977}
978#endif
979
980acpi_status
981acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
982{
983 void __iomem *virt_addr;
984 unsigned int size = width / 8;
985 bool unmap = false;
986
987 rcu_read_lock();
988 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
989 if (!virt_addr) {
990 rcu_read_unlock();
991 virt_addr = acpi_os_ioremap(phys_addr, size);
992 if (!virt_addr)
993 return AE_BAD_ADDRESS;
994 unmap = true;
995 }
996
997 switch (width) {
998 case 8:
999 writeb(value, virt_addr);
1000 break;
1001 case 16:
1002 writew(value, virt_addr);
1003 break;
1004 case 32:
1005 writel(value, virt_addr);
1006 break;
1007 case 64:
1008 write64(value, virt_addr);
1009 break;
1010 default:
1011 BUG();
1012 }
1013
1014 if (unmap)
1015 iounmap(virt_addr);
1016 else
1017 rcu_read_unlock();
1018
1019 return AE_OK;
1020}
1021
1022acpi_status
1023acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1024 u64 *value, u32 width)
1025{
1026 int result, size;
1027 u32 value32;
1028
1029 if (!value)
1030 return AE_BAD_PARAMETER;
1031
1032 switch (width) {
1033 case 8:
1034 size = 1;
1035 break;
1036 case 16:
1037 size = 2;
1038 break;
1039 case 32:
1040 size = 4;
1041 break;
1042 default:
1043 return AE_ERROR;
1044 }
1045
1046 result = raw_pci_read(pci_id->segment, pci_id->bus,
1047 PCI_DEVFN(pci_id->device, pci_id->function),
1048 reg, size, &value32);
1049 *value = value32;
1050
1051 return (result ? AE_ERROR : AE_OK);
1052}
1053
1054acpi_status
1055acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1056 u64 value, u32 width)
1057{
1058 int result, size;
1059
1060 switch (width) {
1061 case 8:
1062 size = 1;
1063 break;
1064 case 16:
1065 size = 2;
1066 break;
1067 case 32:
1068 size = 4;
1069 break;
1070 default:
1071 return AE_ERROR;
1072 }
1073
1074 result = raw_pci_write(pci_id->segment, pci_id->bus,
1075 PCI_DEVFN(pci_id->device, pci_id->function),
1076 reg, size, value);
1077
1078 return (result ? AE_ERROR : AE_OK);
1079}
1080
1081static void acpi_os_execute_deferred(struct work_struct *work)
1082{
1083 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1084
1085 dpc->function(dpc->context);
1086 kfree(dpc);
1087}
1088
1089/*******************************************************************************
1090 *
1091 * FUNCTION: acpi_os_execute
1092 *
1093 * PARAMETERS: Type - Type of the callback
1094 * Function - Function to be executed
1095 * Context - Function parameters
1096 *
1097 * RETURN: Status
1098 *
1099 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1100 * immediately executes function on a separate thread.
1101 *
1102 ******************************************************************************/
1103
1104acpi_status acpi_os_execute(acpi_execute_type type,
1105 acpi_osd_exec_callback function, void *context)
1106{
1107 acpi_status status = AE_OK;
1108 struct acpi_os_dpc *dpc;
1109 struct workqueue_struct *queue;
1110 int ret;
1111 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1112 "Scheduling function [%p(%p)] for deferred execution.\n",
1113 function, context));
1114
1115 /*
1116 * Allocate/initialize DPC structure. Note that this memory will be
1117 * freed by the callee. The kernel handles the work_struct list in a
1118 * way that allows us to also free its memory inside the callee.
1119 * Because we may want to schedule several tasks with different
1120 * parameters we can't use the approach some kernel code uses of
1121 * having a static work_struct.
1122 */
1123
1124 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1125 if (!dpc)
1126 return AE_NO_MEMORY;
1127
1128 dpc->function = function;
1129 dpc->context = context;
1130
1131 /*
1132 * To prevent lockdep from complaining unnecessarily, make sure that
1133 * there is a different static lockdep key for each workqueue by using
1134 * INIT_WORK() for each of them separately.
1135 */
1136 if (type == OSL_NOTIFY_HANDLER) {
1137 queue = kacpi_notify_wq;
1138 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1139 } else {
1140 queue = kacpid_wq;
1141 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1142 }
1143
1144 /*
1145 * On some machines, a software-initiated SMI causes corruption unless
1146 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1147 * typically it's done in GPE-related methods that are run via
1148 * workqueues, so we can avoid the known corruption cases by always
1149 * queueing on CPU 0.
1150 */
1151 ret = queue_work_on(0, queue, &dpc->work);
1152
1153 if (!ret) {
1154 printk(KERN_ERR PREFIX
1155 "Call to queue_work() failed.\n");
1156 status = AE_ERROR;
1157 kfree(dpc);
1158 }
1159 return status;
1160}
1161EXPORT_SYMBOL(acpi_os_execute);
1162
1163void acpi_os_wait_events_complete(void)
1164{
1165 flush_workqueue(kacpid_wq);
1166 flush_workqueue(kacpi_notify_wq);
1167}
1168
1169struct acpi_hp_work {
1170 struct work_struct work;
1171 struct acpi_device *adev;
1172 u32 src;
1173};
1174
1175static void acpi_hotplug_work_fn(struct work_struct *work)
1176{
1177 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1178
1179 acpi_os_wait_events_complete();
1180 acpi_device_hotplug(hpw->adev, hpw->src);
1181 kfree(hpw);
1182}
1183
1184acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1185{
1186 struct acpi_hp_work *hpw;
1187
1188 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1189 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1190 adev, src));
1191
1192 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1193 if (!hpw)
1194 return AE_NO_MEMORY;
1195
1196 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1197 hpw->adev = adev;
1198 hpw->src = src;
1199 /*
1200 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1201 * the hotplug code may call driver .remove() functions, which may
1202 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1203 * these workqueues.
1204 */
1205 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1206 kfree(hpw);
1207 return AE_ERROR;
1208 }
1209 return AE_OK;
1210}
1211
1212bool acpi_queue_hotplug_work(struct work_struct *work)
1213{
1214 return queue_work(kacpi_hotplug_wq, work);
1215}
1216
1217acpi_status
1218acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1219{
1220 struct semaphore *sem = NULL;
1221
1222 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1223 if (!sem)
1224 return AE_NO_MEMORY;
1225
1226 sema_init(sem, initial_units);
1227
1228 *handle = (acpi_handle *) sem;
1229
1230 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1231 *handle, initial_units));
1232
1233 return AE_OK;
1234}
1235
1236/*
1237 * TODO: A better way to delete semaphores? Linux doesn't have a
1238 * 'delete_semaphore()' function -- may result in an invalid
1239 * pointer dereference for non-synchronized consumers. Should
1240 * we at least check for blocked threads and signal/cancel them?
1241 */
1242
1243acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1244{
1245 struct semaphore *sem = (struct semaphore *)handle;
1246
1247 if (!sem)
1248 return AE_BAD_PARAMETER;
1249
1250 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1251
1252 BUG_ON(!list_empty(&sem->wait_list));
1253 kfree(sem);
1254 sem = NULL;
1255
1256 return AE_OK;
1257}
1258
1259/*
1260 * TODO: Support for units > 1?
1261 */
1262acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1263{
1264 acpi_status status = AE_OK;
1265 struct semaphore *sem = (struct semaphore *)handle;
1266 long jiffies;
1267 int ret = 0;
1268
1269 if (!sem || (units < 1))
1270 return AE_BAD_PARAMETER;
1271
1272 if (units > 1)
1273 return AE_SUPPORT;
1274
1275 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1276 handle, units, timeout));
1277
1278 if (timeout == ACPI_WAIT_FOREVER)
1279 jiffies = MAX_SCHEDULE_TIMEOUT;
1280 else
1281 jiffies = msecs_to_jiffies(timeout);
1282
1283 ret = down_timeout(sem, jiffies);
1284 if (ret)
1285 status = AE_TIME;
1286
1287 if (ACPI_FAILURE(status)) {
1288 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1289 "Failed to acquire semaphore[%p|%d|%d], %s",
1290 handle, units, timeout,
1291 acpi_format_exception(status)));
1292 } else {
1293 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1294 "Acquired semaphore[%p|%d|%d]", handle,
1295 units, timeout));
1296 }
1297
1298 return status;
1299}
1300
1301/*
1302 * TODO: Support for units > 1?
1303 */
1304acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1305{
1306 struct semaphore *sem = (struct semaphore *)handle;
1307
1308 if (!sem || (units < 1))
1309 return AE_BAD_PARAMETER;
1310
1311 if (units > 1)
1312 return AE_SUPPORT;
1313
1314 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1315 units));
1316
1317 up(sem);
1318
1319 return AE_OK;
1320}
1321
1322#ifdef ACPI_FUTURE_USAGE
1323u32 acpi_os_get_line(char *buffer)
1324{
1325
1326#ifdef ENABLE_DEBUGGER
1327 if (acpi_in_debugger) {
1328 u32 chars;
1329
1330 kdb_read(buffer, sizeof(line_buf));
1331
1332 /* remove the CR kdb includes */
1333 chars = strlen(buffer) - 1;
1334 buffer[chars] = '\0';
1335 }
1336#endif
1337
1338 return 0;
1339}
1340#endif /* ACPI_FUTURE_USAGE */
1341
1342acpi_status acpi_os_signal(u32 function, void *info)
1343{
1344 switch (function) {
1345 case ACPI_SIGNAL_FATAL:
1346 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1347 break;
1348 case ACPI_SIGNAL_BREAKPOINT:
1349 /*
1350 * AML Breakpoint
1351 * ACPI spec. says to treat it as a NOP unless
1352 * you are debugging. So if/when we integrate
1353 * AML debugger into the kernel debugger its
1354 * hook will go here. But until then it is
1355 * not useful to print anything on breakpoints.
1356 */
1357 break;
1358 default:
1359 break;
1360 }
1361
1362 return AE_OK;
1363}
1364
1365static int __init acpi_os_name_setup(char *str)
1366{
1367 char *p = acpi_os_name;
1368 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1369
1370 if (!str || !*str)
1371 return 0;
1372
1373 for (; count-- && *str; str++) {
1374 if (isalnum(*str) || *str == ' ' || *str == ':')
1375 *p++ = *str;
1376 else if (*str == '\'' || *str == '"')
1377 continue;
1378 else
1379 break;
1380 }
1381 *p = 0;
1382
1383 return 1;
1384
1385}
1386
1387__setup("acpi_os_name=", acpi_os_name_setup);
1388
1389#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1390#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1391
1392struct osi_setup_entry {
1393 char string[OSI_STRING_LENGTH_MAX];
1394 bool enable;
1395};
1396
1397static struct osi_setup_entry
1398 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1399 {"Module Device", true},
1400 {"Processor Device", true},
1401 {"3.0 _SCP Extensions", true},
1402 {"Processor Aggregator Device", true},
1403};
1404
1405void __init acpi_osi_setup(char *str)
1406{
1407 struct osi_setup_entry *osi;
1408 bool enable = true;
1409 int i;
1410
1411 if (!acpi_gbl_create_osi_method)
1412 return;
1413
1414 if (str == NULL || *str == '\0') {
1415 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1416 acpi_gbl_create_osi_method = FALSE;
1417 return;
1418 }
1419
1420 if (*str == '!') {
1421 str++;
1422 if (*str == '\0') {
1423 osi_linux.default_disabling = 1;
1424 return;
1425 } else if (*str == '*') {
1426 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1427 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1428 osi = &osi_setup_entries[i];
1429 osi->enable = false;
1430 }
1431 return;
1432 }
1433 enable = false;
1434 }
1435
1436 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1437 osi = &osi_setup_entries[i];
1438 if (!strcmp(osi->string, str)) {
1439 osi->enable = enable;
1440 break;
1441 } else if (osi->string[0] == '\0') {
1442 osi->enable = enable;
1443 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1444 break;
1445 }
1446 }
1447}
1448
1449static void __init set_osi_linux(unsigned int enable)
1450{
1451 if (osi_linux.enable != enable)
1452 osi_linux.enable = enable;
1453
1454 if (osi_linux.enable)
1455 acpi_osi_setup("Linux");
1456 else
1457 acpi_osi_setup("!Linux");
1458
1459 return;
1460}
1461
1462static void __init acpi_cmdline_osi_linux(unsigned int enable)
1463{
1464 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1465 osi_linux.dmi = 0;
1466 set_osi_linux(enable);
1467
1468 return;
1469}
1470
1471void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1472{
1473 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1474
1475 if (enable == -1)
1476 return;
1477
1478 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1479 set_osi_linux(enable);
1480
1481 return;
1482}
1483
1484/*
1485 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1486 *
1487 * empty string disables _OSI
1488 * string starting with '!' disables that string
1489 * otherwise string is added to list, augmenting built-in strings
1490 */
1491static void __init acpi_osi_setup_late(void)
1492{
1493 struct osi_setup_entry *osi;
1494 char *str;
1495 int i;
1496 acpi_status status;
1497
1498 if (osi_linux.default_disabling) {
1499 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1500
1501 if (ACPI_SUCCESS(status))
1502 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1503 }
1504
1505 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1506 osi = &osi_setup_entries[i];
1507 str = osi->string;
1508
1509 if (*str == '\0')
1510 break;
1511 if (osi->enable) {
1512 status = acpi_install_interface(str);
1513
1514 if (ACPI_SUCCESS(status))
1515 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1516 } else {
1517 status = acpi_remove_interface(str);
1518
1519 if (ACPI_SUCCESS(status))
1520 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1521 }
1522 }
1523}
1524
1525static int __init osi_setup(char *str)
1526{
1527 if (str && !strcmp("Linux", str))
1528 acpi_cmdline_osi_linux(1);
1529 else if (str && !strcmp("!Linux", str))
1530 acpi_cmdline_osi_linux(0);
1531 else
1532 acpi_osi_setup(str);
1533
1534 return 1;
1535}
1536
1537__setup("acpi_osi=", osi_setup);
1538
1539/*
1540 * Disable the auto-serialization of named objects creation methods.
1541 *
1542 * This feature is enabled by default. It marks the AML control methods
1543 * that contain the opcodes to create named objects as "Serialized".
1544 */
1545static int __init acpi_no_auto_serialize_setup(char *str)
1546{
1547 acpi_gbl_auto_serialize_methods = FALSE;
1548 pr_info("ACPI: auto-serialization disabled\n");
1549
1550 return 1;
1551}
1552
1553__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1554
1555/* Check of resource interference between native drivers and ACPI
1556 * OperationRegions (SystemIO and System Memory only).
1557 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1558 * in arbitrary AML code and can interfere with legacy drivers.
1559 * acpi_enforce_resources= can be set to:
1560 *
1561 * - strict (default) (2)
1562 * -> further driver trying to access the resources will not load
1563 * - lax (1)
1564 * -> further driver trying to access the resources will load, but you
1565 * get a system message that something might go wrong...
1566 *
1567 * - no (0)
1568 * -> ACPI Operation Region resources will not be registered
1569 *
1570 */
1571#define ENFORCE_RESOURCES_STRICT 2
1572#define ENFORCE_RESOURCES_LAX 1
1573#define ENFORCE_RESOURCES_NO 0
1574
1575static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1576
1577static int __init acpi_enforce_resources_setup(char *str)
1578{
1579 if (str == NULL || *str == '\0')
1580 return 0;
1581
1582 if (!strcmp("strict", str))
1583 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1584 else if (!strcmp("lax", str))
1585 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1586 else if (!strcmp("no", str))
1587 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1588
1589 return 1;
1590}
1591
1592__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1593
1594/* Check for resource conflicts between ACPI OperationRegions and native
1595 * drivers */
1596int acpi_check_resource_conflict(const struct resource *res)
1597{
1598 acpi_adr_space_type space_id;
1599 acpi_size length;
1600 u8 warn = 0;
1601 int clash = 0;
1602
1603 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1604 return 0;
1605 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1606 return 0;
1607
1608 if (res->flags & IORESOURCE_IO)
1609 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1610 else
1611 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1612
1613 length = resource_size(res);
1614 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1615 warn = 1;
1616 clash = acpi_check_address_range(space_id, res->start, length, warn);
1617
1618 if (clash) {
1619 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1620 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1621 printk(KERN_NOTICE "ACPI: This conflict may"
1622 " cause random problems and system"
1623 " instability\n");
1624 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1625 " for this device, you should use it instead of"
1626 " the native driver\n");
1627 }
1628 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1629 return -EBUSY;
1630 }
1631 return 0;
1632}
1633EXPORT_SYMBOL(acpi_check_resource_conflict);
1634
1635int acpi_check_region(resource_size_t start, resource_size_t n,
1636 const char *name)
1637{
1638 struct resource res = {
1639 .start = start,
1640 .end = start + n - 1,
1641 .name = name,
1642 .flags = IORESOURCE_IO,
1643 };
1644
1645 return acpi_check_resource_conflict(&res);
1646}
1647EXPORT_SYMBOL(acpi_check_region);
1648
1649/*
1650 * Let drivers know whether the resource checks are effective
1651 */
1652int acpi_resources_are_enforced(void)
1653{
1654 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1655}
1656EXPORT_SYMBOL(acpi_resources_are_enforced);
1657
1658/*
1659 * Deallocate the memory for a spinlock.
1660 */
1661void acpi_os_delete_lock(acpi_spinlock handle)
1662{
1663 ACPI_FREE(handle);
1664}
1665
1666/*
1667 * Acquire a spinlock.
1668 *
1669 * handle is a pointer to the spinlock_t.
1670 */
1671
1672acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1673{
1674 acpi_cpu_flags flags;
1675 spin_lock_irqsave(lockp, flags);
1676 return flags;
1677}
1678
1679/*
1680 * Release a spinlock. See above.
1681 */
1682
1683void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1684{
1685 spin_unlock_irqrestore(lockp, flags);
1686}
1687
1688#ifndef ACPI_USE_LOCAL_CACHE
1689
1690/*******************************************************************************
1691 *
1692 * FUNCTION: acpi_os_create_cache
1693 *
1694 * PARAMETERS: name - Ascii name for the cache
1695 * size - Size of each cached object
1696 * depth - Maximum depth of the cache (in objects) <ignored>
1697 * cache - Where the new cache object is returned
1698 *
1699 * RETURN: status
1700 *
1701 * DESCRIPTION: Create a cache object
1702 *
1703 ******************************************************************************/
1704
1705acpi_status
1706acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1707{
1708 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1709 if (*cache == NULL)
1710 return AE_ERROR;
1711 else
1712 return AE_OK;
1713}
1714
1715/*******************************************************************************
1716 *
1717 * FUNCTION: acpi_os_purge_cache
1718 *
1719 * PARAMETERS: Cache - Handle to cache object
1720 *
1721 * RETURN: Status
1722 *
1723 * DESCRIPTION: Free all objects within the requested cache.
1724 *
1725 ******************************************************************************/
1726
1727acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1728{
1729 kmem_cache_shrink(cache);
1730 return (AE_OK);
1731}
1732
1733/*******************************************************************************
1734 *
1735 * FUNCTION: acpi_os_delete_cache
1736 *
1737 * PARAMETERS: Cache - Handle to cache object
1738 *
1739 * RETURN: Status
1740 *
1741 * DESCRIPTION: Free all objects within the requested cache and delete the
1742 * cache object.
1743 *
1744 ******************************************************************************/
1745
1746acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1747{
1748 kmem_cache_destroy(cache);
1749 return (AE_OK);
1750}
1751
1752/*******************************************************************************
1753 *
1754 * FUNCTION: acpi_os_release_object
1755 *
1756 * PARAMETERS: Cache - Handle to cache object
1757 * Object - The object to be released
1758 *
1759 * RETURN: None
1760 *
1761 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1762 * the object is deleted.
1763 *
1764 ******************************************************************************/
1765
1766acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1767{
1768 kmem_cache_free(cache, object);
1769 return (AE_OK);
1770}
1771#endif
1772
1773static int __init acpi_no_auto_ssdt_setup(char *s)
1774{
1775 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1776
1777 acpi_gbl_disable_ssdt_table_load = TRUE;
1778
1779 return 1;
1780}
1781
1782__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1783
1784static int __init acpi_disable_return_repair(char *s)
1785{
1786 printk(KERN_NOTICE PREFIX
1787 "ACPI: Predefined validation mechanism disabled\n");
1788 acpi_gbl_disable_auto_repair = TRUE;
1789
1790 return 1;
1791}
1792
1793__setup("acpica_no_return_repair", acpi_disable_return_repair);
1794
1795acpi_status __init acpi_os_initialize(void)
1796{
1797 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1798 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1799 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1800 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1801
1802 return AE_OK;
1803}
1804
1805acpi_status __init acpi_os_initialize1(void)
1806{
1807 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1808 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1809 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1810 BUG_ON(!kacpid_wq);
1811 BUG_ON(!kacpi_notify_wq);
1812 BUG_ON(!kacpi_hotplug_wq);
1813 acpi_install_interface_handler(acpi_osi_handler);
1814 acpi_osi_setup_late();
1815 return AE_OK;
1816}
1817
1818acpi_status acpi_os_terminate(void)
1819{
1820 if (acpi_irq_handler) {
1821 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1822 acpi_irq_handler);
1823 }
1824
1825 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1826 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1827 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1828 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1829
1830 destroy_workqueue(kacpid_wq);
1831 destroy_workqueue(kacpi_notify_wq);
1832 destroy_workqueue(kacpi_hotplug_wq);
1833
1834 return AE_OK;
1835}
1836
1837acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1838 u32 pm1b_control)
1839{
1840 int rc = 0;
1841 if (__acpi_os_prepare_sleep)
1842 rc = __acpi_os_prepare_sleep(sleep_state,
1843 pm1a_control, pm1b_control);
1844 if (rc < 0)
1845 return AE_ERROR;
1846 else if (rc > 0)
1847 return AE_CTRL_SKIP;
1848
1849 return AE_OK;
1850}
1851
1852void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1853 u32 pm1a_ctrl, u32 pm1b_ctrl))
1854{
1855 __acpi_os_prepare_sleep = func;
1856}
1857
1858acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1859 u32 val_b)
1860{
1861 int rc = 0;
1862 if (__acpi_os_prepare_extended_sleep)
1863 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1864 val_a, val_b);
1865 if (rc < 0)
1866 return AE_ERROR;
1867 else if (rc > 0)
1868 return AE_CTRL_SKIP;
1869
1870 return AE_OK;
1871}
1872
1873void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1874 u32 val_a, u32 val_b))
1875{
1876 __acpi_os_prepare_extended_sleep = func;
1877}