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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 unsigned long refcount;
81};
82
83static LIST_HEAD(acpi_ioremaps);
84static DEFINE_MUTEX(acpi_ioremap_lock);
85#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
86
87static void __init acpi_request_region (struct acpi_generic_address *gas,
88 unsigned int length, char *desc)
89{
90 u64 addr;
91
92 /* Handle possible alignment issues */
93 memcpy(&addr, &gas->address, sizeof(addr));
94 if (!addr || !length)
95 return;
96
97 /* Resources are never freed */
98 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
99 request_region(addr, length, desc);
100 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
101 request_mem_region(addr, length, desc);
102}
103
104static int __init acpi_reserve_resources(void)
105{
106 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
107 "ACPI PM1a_EVT_BLK");
108
109 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
110 "ACPI PM1b_EVT_BLK");
111
112 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
113 "ACPI PM1a_CNT_BLK");
114
115 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
116 "ACPI PM1b_CNT_BLK");
117
118 if (acpi_gbl_FADT.pm_timer_length == 4)
119 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
120
121 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
122 "ACPI PM2_CNT_BLK");
123
124 /* Length of GPE blocks must be a non-negative multiple of 2 */
125
126 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
127 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
128 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
129
130 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
131 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
132 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
133
134 return 0;
135}
136fs_initcall_sync(acpi_reserve_resources);
137
138void acpi_os_printf(const char *fmt, ...)
139{
140 va_list args;
141 va_start(args, fmt);
142 acpi_os_vprintf(fmt, args);
143 va_end(args);
144}
145EXPORT_SYMBOL(acpi_os_printf);
146
147void acpi_os_vprintf(const char *fmt, va_list args)
148{
149 static char buffer[512];
150
151 vsprintf(buffer, fmt, args);
152
153#ifdef ENABLE_DEBUGGER
154 if (acpi_in_debugger) {
155 kdb_printf("%s", buffer);
156 } else {
157 if (printk_get_level(buffer))
158 printk("%s", buffer);
159 else
160 printk(KERN_CONT "%s", buffer);
161 }
162#else
163 if (acpi_debugger_write_log(buffer) < 0) {
164 if (printk_get_level(buffer))
165 printk("%s", buffer);
166 else
167 printk(KERN_CONT "%s", buffer);
168 }
169#endif
170}
171
172#ifdef CONFIG_KEXEC
173static unsigned long acpi_rsdp;
174static int __init setup_acpi_rsdp(char *arg)
175{
176 return kstrtoul(arg, 16, &acpi_rsdp);
177}
178early_param("acpi_rsdp", setup_acpi_rsdp);
179#endif
180
181acpi_physical_address __init acpi_os_get_root_pointer(void)
182{
183 acpi_physical_address pa;
184
185#ifdef CONFIG_KEXEC
186 /*
187 * We may have been provided with an RSDP on the command line,
188 * but if a malicious user has done so they may be pointing us
189 * at modified ACPI tables that could alter kernel behaviour -
190 * so, we check the lockdown status before making use of
191 * it. If we trust it then also stash it in an architecture
192 * specific location (if appropriate) so it can be carried
193 * over further kexec()s.
194 */
195 if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
196 acpi_arch_set_root_pointer(acpi_rsdp);
197 return acpi_rsdp;
198 }
199#endif
200 pa = acpi_arch_get_root_pointer();
201 if (pa)
202 return pa;
203
204 if (efi_enabled(EFI_CONFIG_TABLES)) {
205 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
206 return efi.acpi20;
207 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
208 return efi.acpi;
209 pr_err(PREFIX "System description tables not found\n");
210 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
211 acpi_find_root_pointer(&pa);
212 }
213
214 return pa;
215}
216
217/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
218static struct acpi_ioremap *
219acpi_map_lookup(acpi_physical_address phys, acpi_size size)
220{
221 struct acpi_ioremap *map;
222
223 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
224 if (map->phys <= phys &&
225 phys + size <= map->phys + map->size)
226 return map;
227
228 return NULL;
229}
230
231/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
232static void __iomem *
233acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
234{
235 struct acpi_ioremap *map;
236
237 map = acpi_map_lookup(phys, size);
238 if (map)
239 return map->virt + (phys - map->phys);
240
241 return NULL;
242}
243
244void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
245{
246 struct acpi_ioremap *map;
247 void __iomem *virt = NULL;
248
249 mutex_lock(&acpi_ioremap_lock);
250 map = acpi_map_lookup(phys, size);
251 if (map) {
252 virt = map->virt + (phys - map->phys);
253 map->refcount++;
254 }
255 mutex_unlock(&acpi_ioremap_lock);
256 return virt;
257}
258EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
259
260/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
261static struct acpi_ioremap *
262acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
263{
264 struct acpi_ioremap *map;
265
266 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
267 if (map->virt <= virt &&
268 virt + size <= map->virt + map->size)
269 return map;
270
271 return NULL;
272}
273
274#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
275/* ioremap will take care of cache attributes */
276#define should_use_kmap(pfn) 0
277#else
278#define should_use_kmap(pfn) page_is_ram(pfn)
279#endif
280
281static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
282{
283 unsigned long pfn;
284
285 pfn = pg_off >> PAGE_SHIFT;
286 if (should_use_kmap(pfn)) {
287 if (pg_sz > PAGE_SIZE)
288 return NULL;
289 return (void __iomem __force *)kmap(pfn_to_page(pfn));
290 } else
291 return acpi_os_ioremap(pg_off, pg_sz);
292}
293
294static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
295{
296 unsigned long pfn;
297
298 pfn = pg_off >> PAGE_SHIFT;
299 if (should_use_kmap(pfn))
300 kunmap(pfn_to_page(pfn));
301 else
302 iounmap(vaddr);
303}
304
305/**
306 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
307 * @phys: Start of the physical address range to map.
308 * @size: Size of the physical address range to map.
309 *
310 * Look up the given physical address range in the list of existing ACPI memory
311 * mappings. If found, get a reference to it and return a pointer to it (its
312 * virtual address). If not found, map it, add it to that list and return a
313 * pointer to it.
314 *
315 * During early init (when acpi_permanent_mmap has not been set yet) this
316 * routine simply calls __acpi_map_table() to get the job done.
317 */
318void __iomem __ref
319*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
320{
321 struct acpi_ioremap *map;
322 void __iomem *virt;
323 acpi_physical_address pg_off;
324 acpi_size pg_sz;
325
326 if (phys > ULONG_MAX) {
327 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
328 return NULL;
329 }
330
331 if (!acpi_permanent_mmap)
332 return __acpi_map_table((unsigned long)phys, size);
333
334 mutex_lock(&acpi_ioremap_lock);
335 /* Check if there's a suitable mapping already. */
336 map = acpi_map_lookup(phys, size);
337 if (map) {
338 map->refcount++;
339 goto out;
340 }
341
342 map = kzalloc(sizeof(*map), GFP_KERNEL);
343 if (!map) {
344 mutex_unlock(&acpi_ioremap_lock);
345 return NULL;
346 }
347
348 pg_off = round_down(phys, PAGE_SIZE);
349 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
350 virt = acpi_map(pg_off, pg_sz);
351 if (!virt) {
352 mutex_unlock(&acpi_ioremap_lock);
353 kfree(map);
354 return NULL;
355 }
356
357 INIT_LIST_HEAD(&map->list);
358 map->virt = virt;
359 map->phys = pg_off;
360 map->size = pg_sz;
361 map->refcount = 1;
362
363 list_add_tail_rcu(&map->list, &acpi_ioremaps);
364
365out:
366 mutex_unlock(&acpi_ioremap_lock);
367 return map->virt + (phys - map->phys);
368}
369EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
370
371void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
372{
373 return (void *)acpi_os_map_iomem(phys, size);
374}
375EXPORT_SYMBOL_GPL(acpi_os_map_memory);
376
377static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
378{
379 if (!--map->refcount)
380 list_del_rcu(&map->list);
381}
382
383static void acpi_os_map_cleanup(struct acpi_ioremap *map)
384{
385 if (!map->refcount) {
386 synchronize_rcu_expedited();
387 acpi_unmap(map->phys, map->virt);
388 kfree(map);
389 }
390}
391
392/**
393 * acpi_os_unmap_iomem - Drop a memory mapping reference.
394 * @virt: Start of the address range to drop a reference to.
395 * @size: Size of the address range to drop a reference to.
396 *
397 * Look up the given virtual address range in the list of existing ACPI memory
398 * mappings, drop a reference to it and unmap it if there are no more active
399 * references to it.
400 *
401 * During early init (when acpi_permanent_mmap has not been set yet) this
402 * routine simply calls __acpi_unmap_table() to get the job done. Since
403 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
404 * here.
405 */
406void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
407{
408 struct acpi_ioremap *map;
409
410 if (!acpi_permanent_mmap) {
411 __acpi_unmap_table(virt, size);
412 return;
413 }
414
415 mutex_lock(&acpi_ioremap_lock);
416 map = acpi_map_lookup_virt(virt, size);
417 if (!map) {
418 mutex_unlock(&acpi_ioremap_lock);
419 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
420 return;
421 }
422 acpi_os_drop_map_ref(map);
423 mutex_unlock(&acpi_ioremap_lock);
424
425 acpi_os_map_cleanup(map);
426}
427EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
428
429void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
430{
431 return acpi_os_unmap_iomem((void __iomem *)virt, size);
432}
433EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
434
435int acpi_os_map_generic_address(struct acpi_generic_address *gas)
436{
437 u64 addr;
438 void __iomem *virt;
439
440 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
441 return 0;
442
443 /* Handle possible alignment issues */
444 memcpy(&addr, &gas->address, sizeof(addr));
445 if (!addr || !gas->bit_width)
446 return -EINVAL;
447
448 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
449 if (!virt)
450 return -EIO;
451
452 return 0;
453}
454EXPORT_SYMBOL(acpi_os_map_generic_address);
455
456void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
457{
458 u64 addr;
459 struct acpi_ioremap *map;
460
461 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462 return;
463
464 /* Handle possible alignment issues */
465 memcpy(&addr, &gas->address, sizeof(addr));
466 if (!addr || !gas->bit_width)
467 return;
468
469 mutex_lock(&acpi_ioremap_lock);
470 map = acpi_map_lookup(addr, gas->bit_width / 8);
471 if (!map) {
472 mutex_unlock(&acpi_ioremap_lock);
473 return;
474 }
475 acpi_os_drop_map_ref(map);
476 mutex_unlock(&acpi_ioremap_lock);
477
478 acpi_os_map_cleanup(map);
479}
480EXPORT_SYMBOL(acpi_os_unmap_generic_address);
481
482#ifdef ACPI_FUTURE_USAGE
483acpi_status
484acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
485{
486 if (!phys || !virt)
487 return AE_BAD_PARAMETER;
488
489 *phys = virt_to_phys(virt);
490
491 return AE_OK;
492}
493#endif
494
495#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
496static bool acpi_rev_override;
497
498int __init acpi_rev_override_setup(char *str)
499{
500 acpi_rev_override = true;
501 return 1;
502}
503__setup("acpi_rev_override", acpi_rev_override_setup);
504#else
505#define acpi_rev_override false
506#endif
507
508#define ACPI_MAX_OVERRIDE_LEN 100
509
510static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
511
512acpi_status
513acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
514 acpi_string *new_val)
515{
516 if (!init_val || !new_val)
517 return AE_BAD_PARAMETER;
518
519 *new_val = NULL;
520 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
521 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
522 acpi_os_name);
523 *new_val = acpi_os_name;
524 }
525
526 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
527 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
528 *new_val = (char *)5;
529 }
530
531 return AE_OK;
532}
533
534static irqreturn_t acpi_irq(int irq, void *dev_id)
535{
536 u32 handled;
537
538 handled = (*acpi_irq_handler) (acpi_irq_context);
539
540 if (handled) {
541 acpi_irq_handled++;
542 return IRQ_HANDLED;
543 } else {
544 acpi_irq_not_handled++;
545 return IRQ_NONE;
546 }
547}
548
549acpi_status
550acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
551 void *context)
552{
553 unsigned int irq;
554
555 acpi_irq_stats_init();
556
557 /*
558 * ACPI interrupts different from the SCI in our copy of the FADT are
559 * not supported.
560 */
561 if (gsi != acpi_gbl_FADT.sci_interrupt)
562 return AE_BAD_PARAMETER;
563
564 if (acpi_irq_handler)
565 return AE_ALREADY_ACQUIRED;
566
567 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
568 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
569 gsi);
570 return AE_OK;
571 }
572
573 acpi_irq_handler = handler;
574 acpi_irq_context = context;
575 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
576 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
577 acpi_irq_handler = NULL;
578 return AE_NOT_ACQUIRED;
579 }
580 acpi_sci_irq = irq;
581
582 return AE_OK;
583}
584
585acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
586{
587 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
588 return AE_BAD_PARAMETER;
589
590 free_irq(acpi_sci_irq, acpi_irq);
591 acpi_irq_handler = NULL;
592 acpi_sci_irq = INVALID_ACPI_IRQ;
593
594 return AE_OK;
595}
596
597/*
598 * Running in interpreter thread context, safe to sleep
599 */
600
601void acpi_os_sleep(u64 ms)
602{
603 msleep(ms);
604}
605
606void acpi_os_stall(u32 us)
607{
608 while (us) {
609 u32 delay = 1000;
610
611 if (delay > us)
612 delay = us;
613 udelay(delay);
614 touch_nmi_watchdog();
615 us -= delay;
616 }
617}
618
619/*
620 * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
621 * monotonically increasing timer with 100ns granularity. Do not use
622 * ktime_get() to implement this function because this function may get
623 * called after timekeeping has been suspended. Note: calling this function
624 * after timekeeping has been suspended may lead to unexpected results
625 * because when timekeeping is suspended the jiffies counter is not
626 * incremented. See also timekeeping_suspend().
627 */
628u64 acpi_os_get_timer(void)
629{
630 return (get_jiffies_64() - INITIAL_JIFFIES) *
631 (ACPI_100NSEC_PER_SEC / HZ);
632}
633
634acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
635{
636 u32 dummy;
637
638 if (!value)
639 value = &dummy;
640
641 *value = 0;
642 if (width <= 8) {
643 *(u8 *) value = inb(port);
644 } else if (width <= 16) {
645 *(u16 *) value = inw(port);
646 } else if (width <= 32) {
647 *(u32 *) value = inl(port);
648 } else {
649 BUG();
650 }
651
652 return AE_OK;
653}
654
655EXPORT_SYMBOL(acpi_os_read_port);
656
657acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
658{
659 if (width <= 8) {
660 outb(value, port);
661 } else if (width <= 16) {
662 outw(value, port);
663 } else if (width <= 32) {
664 outl(value, port);
665 } else {
666 BUG();
667 }
668
669 return AE_OK;
670}
671
672EXPORT_SYMBOL(acpi_os_write_port);
673
674int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
675{
676
677 switch (width) {
678 case 8:
679 *(u8 *) value = readb(virt_addr);
680 break;
681 case 16:
682 *(u16 *) value = readw(virt_addr);
683 break;
684 case 32:
685 *(u32 *) value = readl(virt_addr);
686 break;
687 case 64:
688 *(u64 *) value = readq(virt_addr);
689 break;
690 default:
691 return -EINVAL;
692 }
693
694 return 0;
695}
696
697acpi_status
698acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
699{
700 void __iomem *virt_addr;
701 unsigned int size = width / 8;
702 bool unmap = false;
703 u64 dummy;
704 int error;
705
706 rcu_read_lock();
707 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
708 if (!virt_addr) {
709 rcu_read_unlock();
710 virt_addr = acpi_os_ioremap(phys_addr, size);
711 if (!virt_addr)
712 return AE_BAD_ADDRESS;
713 unmap = true;
714 }
715
716 if (!value)
717 value = &dummy;
718
719 error = acpi_os_read_iomem(virt_addr, value, width);
720 BUG_ON(error);
721
722 if (unmap)
723 iounmap(virt_addr);
724 else
725 rcu_read_unlock();
726
727 return AE_OK;
728}
729
730acpi_status
731acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
732{
733 void __iomem *virt_addr;
734 unsigned int size = width / 8;
735 bool unmap = false;
736
737 rcu_read_lock();
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
739 if (!virt_addr) {
740 rcu_read_unlock();
741 virt_addr = acpi_os_ioremap(phys_addr, size);
742 if (!virt_addr)
743 return AE_BAD_ADDRESS;
744 unmap = true;
745 }
746
747 switch (width) {
748 case 8:
749 writeb(value, virt_addr);
750 break;
751 case 16:
752 writew(value, virt_addr);
753 break;
754 case 32:
755 writel(value, virt_addr);
756 break;
757 case 64:
758 writeq(value, virt_addr);
759 break;
760 default:
761 BUG();
762 }
763
764 if (unmap)
765 iounmap(virt_addr);
766 else
767 rcu_read_unlock();
768
769 return AE_OK;
770}
771
772#ifdef CONFIG_PCI
773acpi_status
774acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
775 u64 *value, u32 width)
776{
777 int result, size;
778 u32 value32;
779
780 if (!value)
781 return AE_BAD_PARAMETER;
782
783 switch (width) {
784 case 8:
785 size = 1;
786 break;
787 case 16:
788 size = 2;
789 break;
790 case 32:
791 size = 4;
792 break;
793 default:
794 return AE_ERROR;
795 }
796
797 result = raw_pci_read(pci_id->segment, pci_id->bus,
798 PCI_DEVFN(pci_id->device, pci_id->function),
799 reg, size, &value32);
800 *value = value32;
801
802 return (result ? AE_ERROR : AE_OK);
803}
804
805acpi_status
806acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
807 u64 value, u32 width)
808{
809 int result, size;
810
811 switch (width) {
812 case 8:
813 size = 1;
814 break;
815 case 16:
816 size = 2;
817 break;
818 case 32:
819 size = 4;
820 break;
821 default:
822 return AE_ERROR;
823 }
824
825 result = raw_pci_write(pci_id->segment, pci_id->bus,
826 PCI_DEVFN(pci_id->device, pci_id->function),
827 reg, size, value);
828
829 return (result ? AE_ERROR : AE_OK);
830}
831#endif
832
833static void acpi_os_execute_deferred(struct work_struct *work)
834{
835 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
836
837 dpc->function(dpc->context);
838 kfree(dpc);
839}
840
841#ifdef CONFIG_ACPI_DEBUGGER
842static struct acpi_debugger acpi_debugger;
843static bool acpi_debugger_initialized;
844
845int acpi_register_debugger(struct module *owner,
846 const struct acpi_debugger_ops *ops)
847{
848 int ret = 0;
849
850 mutex_lock(&acpi_debugger.lock);
851 if (acpi_debugger.ops) {
852 ret = -EBUSY;
853 goto err_lock;
854 }
855
856 acpi_debugger.owner = owner;
857 acpi_debugger.ops = ops;
858
859err_lock:
860 mutex_unlock(&acpi_debugger.lock);
861 return ret;
862}
863EXPORT_SYMBOL(acpi_register_debugger);
864
865void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
866{
867 mutex_lock(&acpi_debugger.lock);
868 if (ops == acpi_debugger.ops) {
869 acpi_debugger.ops = NULL;
870 acpi_debugger.owner = NULL;
871 }
872 mutex_unlock(&acpi_debugger.lock);
873}
874EXPORT_SYMBOL(acpi_unregister_debugger);
875
876int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
877{
878 int ret;
879 int (*func)(acpi_osd_exec_callback, void *);
880 struct module *owner;
881
882 if (!acpi_debugger_initialized)
883 return -ENODEV;
884 mutex_lock(&acpi_debugger.lock);
885 if (!acpi_debugger.ops) {
886 ret = -ENODEV;
887 goto err_lock;
888 }
889 if (!try_module_get(acpi_debugger.owner)) {
890 ret = -ENODEV;
891 goto err_lock;
892 }
893 func = acpi_debugger.ops->create_thread;
894 owner = acpi_debugger.owner;
895 mutex_unlock(&acpi_debugger.lock);
896
897 ret = func(function, context);
898
899 mutex_lock(&acpi_debugger.lock);
900 module_put(owner);
901err_lock:
902 mutex_unlock(&acpi_debugger.lock);
903 return ret;
904}
905
906ssize_t acpi_debugger_write_log(const char *msg)
907{
908 ssize_t ret;
909 ssize_t (*func)(const char *);
910 struct module *owner;
911
912 if (!acpi_debugger_initialized)
913 return -ENODEV;
914 mutex_lock(&acpi_debugger.lock);
915 if (!acpi_debugger.ops) {
916 ret = -ENODEV;
917 goto err_lock;
918 }
919 if (!try_module_get(acpi_debugger.owner)) {
920 ret = -ENODEV;
921 goto err_lock;
922 }
923 func = acpi_debugger.ops->write_log;
924 owner = acpi_debugger.owner;
925 mutex_unlock(&acpi_debugger.lock);
926
927 ret = func(msg);
928
929 mutex_lock(&acpi_debugger.lock);
930 module_put(owner);
931err_lock:
932 mutex_unlock(&acpi_debugger.lock);
933 return ret;
934}
935
936ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
937{
938 ssize_t ret;
939 ssize_t (*func)(char *, size_t);
940 struct module *owner;
941
942 if (!acpi_debugger_initialized)
943 return -ENODEV;
944 mutex_lock(&acpi_debugger.lock);
945 if (!acpi_debugger.ops) {
946 ret = -ENODEV;
947 goto err_lock;
948 }
949 if (!try_module_get(acpi_debugger.owner)) {
950 ret = -ENODEV;
951 goto err_lock;
952 }
953 func = acpi_debugger.ops->read_cmd;
954 owner = acpi_debugger.owner;
955 mutex_unlock(&acpi_debugger.lock);
956
957 ret = func(buffer, buffer_length);
958
959 mutex_lock(&acpi_debugger.lock);
960 module_put(owner);
961err_lock:
962 mutex_unlock(&acpi_debugger.lock);
963 return ret;
964}
965
966int acpi_debugger_wait_command_ready(void)
967{
968 int ret;
969 int (*func)(bool, char *, size_t);
970 struct module *owner;
971
972 if (!acpi_debugger_initialized)
973 return -ENODEV;
974 mutex_lock(&acpi_debugger.lock);
975 if (!acpi_debugger.ops) {
976 ret = -ENODEV;
977 goto err_lock;
978 }
979 if (!try_module_get(acpi_debugger.owner)) {
980 ret = -ENODEV;
981 goto err_lock;
982 }
983 func = acpi_debugger.ops->wait_command_ready;
984 owner = acpi_debugger.owner;
985 mutex_unlock(&acpi_debugger.lock);
986
987 ret = func(acpi_gbl_method_executing,
988 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
989
990 mutex_lock(&acpi_debugger.lock);
991 module_put(owner);
992err_lock:
993 mutex_unlock(&acpi_debugger.lock);
994 return ret;
995}
996
997int acpi_debugger_notify_command_complete(void)
998{
999 int ret;
1000 int (*func)(void);
1001 struct module *owner;
1002
1003 if (!acpi_debugger_initialized)
1004 return -ENODEV;
1005 mutex_lock(&acpi_debugger.lock);
1006 if (!acpi_debugger.ops) {
1007 ret = -ENODEV;
1008 goto err_lock;
1009 }
1010 if (!try_module_get(acpi_debugger.owner)) {
1011 ret = -ENODEV;
1012 goto err_lock;
1013 }
1014 func = acpi_debugger.ops->notify_command_complete;
1015 owner = acpi_debugger.owner;
1016 mutex_unlock(&acpi_debugger.lock);
1017
1018 ret = func();
1019
1020 mutex_lock(&acpi_debugger.lock);
1021 module_put(owner);
1022err_lock:
1023 mutex_unlock(&acpi_debugger.lock);
1024 return ret;
1025}
1026
1027int __init acpi_debugger_init(void)
1028{
1029 mutex_init(&acpi_debugger.lock);
1030 acpi_debugger_initialized = true;
1031 return 0;
1032}
1033#endif
1034
1035/*******************************************************************************
1036 *
1037 * FUNCTION: acpi_os_execute
1038 *
1039 * PARAMETERS: Type - Type of the callback
1040 * Function - Function to be executed
1041 * Context - Function parameters
1042 *
1043 * RETURN: Status
1044 *
1045 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1046 * immediately executes function on a separate thread.
1047 *
1048 ******************************************************************************/
1049
1050acpi_status acpi_os_execute(acpi_execute_type type,
1051 acpi_osd_exec_callback function, void *context)
1052{
1053 acpi_status status = AE_OK;
1054 struct acpi_os_dpc *dpc;
1055 struct workqueue_struct *queue;
1056 int ret;
1057 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1058 "Scheduling function [%p(%p)] for deferred execution.\n",
1059 function, context));
1060
1061 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1062 ret = acpi_debugger_create_thread(function, context);
1063 if (ret) {
1064 pr_err("Call to kthread_create() failed.\n");
1065 status = AE_ERROR;
1066 }
1067 goto out_thread;
1068 }
1069
1070 /*
1071 * Allocate/initialize DPC structure. Note that this memory will be
1072 * freed by the callee. The kernel handles the work_struct list in a
1073 * way that allows us to also free its memory inside the callee.
1074 * Because we may want to schedule several tasks with different
1075 * parameters we can't use the approach some kernel code uses of
1076 * having a static work_struct.
1077 */
1078
1079 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1080 if (!dpc)
1081 return AE_NO_MEMORY;
1082
1083 dpc->function = function;
1084 dpc->context = context;
1085
1086 /*
1087 * To prevent lockdep from complaining unnecessarily, make sure that
1088 * there is a different static lockdep key for each workqueue by using
1089 * INIT_WORK() for each of them separately.
1090 */
1091 if (type == OSL_NOTIFY_HANDLER) {
1092 queue = kacpi_notify_wq;
1093 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1094 } else if (type == OSL_GPE_HANDLER) {
1095 queue = kacpid_wq;
1096 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1097 } else {
1098 pr_err("Unsupported os_execute type %d.\n", type);
1099 status = AE_ERROR;
1100 }
1101
1102 if (ACPI_FAILURE(status))
1103 goto err_workqueue;
1104
1105 /*
1106 * On some machines, a software-initiated SMI causes corruption unless
1107 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1108 * typically it's done in GPE-related methods that are run via
1109 * workqueues, so we can avoid the known corruption cases by always
1110 * queueing on CPU 0.
1111 */
1112 ret = queue_work_on(0, queue, &dpc->work);
1113 if (!ret) {
1114 printk(KERN_ERR PREFIX
1115 "Call to queue_work() failed.\n");
1116 status = AE_ERROR;
1117 }
1118err_workqueue:
1119 if (ACPI_FAILURE(status))
1120 kfree(dpc);
1121out_thread:
1122 return status;
1123}
1124EXPORT_SYMBOL(acpi_os_execute);
1125
1126void acpi_os_wait_events_complete(void)
1127{
1128 /*
1129 * Make sure the GPE handler or the fixed event handler is not used
1130 * on another CPU after removal.
1131 */
1132 if (acpi_sci_irq_valid())
1133 synchronize_hardirq(acpi_sci_irq);
1134 flush_workqueue(kacpid_wq);
1135 flush_workqueue(kacpi_notify_wq);
1136}
1137EXPORT_SYMBOL(acpi_os_wait_events_complete);
1138
1139struct acpi_hp_work {
1140 struct work_struct work;
1141 struct acpi_device *adev;
1142 u32 src;
1143};
1144
1145static void acpi_hotplug_work_fn(struct work_struct *work)
1146{
1147 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1148
1149 acpi_os_wait_events_complete();
1150 acpi_device_hotplug(hpw->adev, hpw->src);
1151 kfree(hpw);
1152}
1153
1154acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1155{
1156 struct acpi_hp_work *hpw;
1157
1158 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1159 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1160 adev, src));
1161
1162 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1163 if (!hpw)
1164 return AE_NO_MEMORY;
1165
1166 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1167 hpw->adev = adev;
1168 hpw->src = src;
1169 /*
1170 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1171 * the hotplug code may call driver .remove() functions, which may
1172 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1173 * these workqueues.
1174 */
1175 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1176 kfree(hpw);
1177 return AE_ERROR;
1178 }
1179 return AE_OK;
1180}
1181
1182bool acpi_queue_hotplug_work(struct work_struct *work)
1183{
1184 return queue_work(kacpi_hotplug_wq, work);
1185}
1186
1187acpi_status
1188acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1189{
1190 struct semaphore *sem = NULL;
1191
1192 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1193 if (!sem)
1194 return AE_NO_MEMORY;
1195
1196 sema_init(sem, initial_units);
1197
1198 *handle = (acpi_handle *) sem;
1199
1200 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1201 *handle, initial_units));
1202
1203 return AE_OK;
1204}
1205
1206/*
1207 * TODO: A better way to delete semaphores? Linux doesn't have a
1208 * 'delete_semaphore()' function -- may result in an invalid
1209 * pointer dereference for non-synchronized consumers. Should
1210 * we at least check for blocked threads and signal/cancel them?
1211 */
1212
1213acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1214{
1215 struct semaphore *sem = (struct semaphore *)handle;
1216
1217 if (!sem)
1218 return AE_BAD_PARAMETER;
1219
1220 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1221
1222 BUG_ON(!list_empty(&sem->wait_list));
1223 kfree(sem);
1224 sem = NULL;
1225
1226 return AE_OK;
1227}
1228
1229/*
1230 * TODO: Support for units > 1?
1231 */
1232acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1233{
1234 acpi_status status = AE_OK;
1235 struct semaphore *sem = (struct semaphore *)handle;
1236 long jiffies;
1237 int ret = 0;
1238
1239 if (!acpi_os_initialized)
1240 return AE_OK;
1241
1242 if (!sem || (units < 1))
1243 return AE_BAD_PARAMETER;
1244
1245 if (units > 1)
1246 return AE_SUPPORT;
1247
1248 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1249 handle, units, timeout));
1250
1251 if (timeout == ACPI_WAIT_FOREVER)
1252 jiffies = MAX_SCHEDULE_TIMEOUT;
1253 else
1254 jiffies = msecs_to_jiffies(timeout);
1255
1256 ret = down_timeout(sem, jiffies);
1257 if (ret)
1258 status = AE_TIME;
1259
1260 if (ACPI_FAILURE(status)) {
1261 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1262 "Failed to acquire semaphore[%p|%d|%d], %s",
1263 handle, units, timeout,
1264 acpi_format_exception(status)));
1265 } else {
1266 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1267 "Acquired semaphore[%p|%d|%d]", handle,
1268 units, timeout));
1269 }
1270
1271 return status;
1272}
1273
1274/*
1275 * TODO: Support for units > 1?
1276 */
1277acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1278{
1279 struct semaphore *sem = (struct semaphore *)handle;
1280
1281 if (!acpi_os_initialized)
1282 return AE_OK;
1283
1284 if (!sem || (units < 1))
1285 return AE_BAD_PARAMETER;
1286
1287 if (units > 1)
1288 return AE_SUPPORT;
1289
1290 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1291 units));
1292
1293 up(sem);
1294
1295 return AE_OK;
1296}
1297
1298acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1299{
1300#ifdef ENABLE_DEBUGGER
1301 if (acpi_in_debugger) {
1302 u32 chars;
1303
1304 kdb_read(buffer, buffer_length);
1305
1306 /* remove the CR kdb includes */
1307 chars = strlen(buffer) - 1;
1308 buffer[chars] = '\0';
1309 }
1310#else
1311 int ret;
1312
1313 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1314 if (ret < 0)
1315 return AE_ERROR;
1316 if (bytes_read)
1317 *bytes_read = ret;
1318#endif
1319
1320 return AE_OK;
1321}
1322EXPORT_SYMBOL(acpi_os_get_line);
1323
1324acpi_status acpi_os_wait_command_ready(void)
1325{
1326 int ret;
1327
1328 ret = acpi_debugger_wait_command_ready();
1329 if (ret < 0)
1330 return AE_ERROR;
1331 return AE_OK;
1332}
1333
1334acpi_status acpi_os_notify_command_complete(void)
1335{
1336 int ret;
1337
1338 ret = acpi_debugger_notify_command_complete();
1339 if (ret < 0)
1340 return AE_ERROR;
1341 return AE_OK;
1342}
1343
1344acpi_status acpi_os_signal(u32 function, void *info)
1345{
1346 switch (function) {
1347 case ACPI_SIGNAL_FATAL:
1348 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1349 break;
1350 case ACPI_SIGNAL_BREAKPOINT:
1351 /*
1352 * AML Breakpoint
1353 * ACPI spec. says to treat it as a NOP unless
1354 * you are debugging. So if/when we integrate
1355 * AML debugger into the kernel debugger its
1356 * hook will go here. But until then it is
1357 * not useful to print anything on breakpoints.
1358 */
1359 break;
1360 default:
1361 break;
1362 }
1363
1364 return AE_OK;
1365}
1366
1367static int __init acpi_os_name_setup(char *str)
1368{
1369 char *p = acpi_os_name;
1370 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1371
1372 if (!str || !*str)
1373 return 0;
1374
1375 for (; count-- && *str; str++) {
1376 if (isalnum(*str) || *str == ' ' || *str == ':')
1377 *p++ = *str;
1378 else if (*str == '\'' || *str == '"')
1379 continue;
1380 else
1381 break;
1382 }
1383 *p = 0;
1384
1385 return 1;
1386
1387}
1388
1389__setup("acpi_os_name=", acpi_os_name_setup);
1390
1391/*
1392 * Disable the auto-serialization of named objects creation methods.
1393 *
1394 * This feature is enabled by default. It marks the AML control methods
1395 * that contain the opcodes to create named objects as "Serialized".
1396 */
1397static int __init acpi_no_auto_serialize_setup(char *str)
1398{
1399 acpi_gbl_auto_serialize_methods = FALSE;
1400 pr_info("ACPI: auto-serialization disabled\n");
1401
1402 return 1;
1403}
1404
1405__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1406
1407/* Check of resource interference between native drivers and ACPI
1408 * OperationRegions (SystemIO and System Memory only).
1409 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1410 * in arbitrary AML code and can interfere with legacy drivers.
1411 * acpi_enforce_resources= can be set to:
1412 *
1413 * - strict (default) (2)
1414 * -> further driver trying to access the resources will not load
1415 * - lax (1)
1416 * -> further driver trying to access the resources will load, but you
1417 * get a system message that something might go wrong...
1418 *
1419 * - no (0)
1420 * -> ACPI Operation Region resources will not be registered
1421 *
1422 */
1423#define ENFORCE_RESOURCES_STRICT 2
1424#define ENFORCE_RESOURCES_LAX 1
1425#define ENFORCE_RESOURCES_NO 0
1426
1427static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1428
1429static int __init acpi_enforce_resources_setup(char *str)
1430{
1431 if (str == NULL || *str == '\0')
1432 return 0;
1433
1434 if (!strcmp("strict", str))
1435 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1436 else if (!strcmp("lax", str))
1437 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1438 else if (!strcmp("no", str))
1439 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1440
1441 return 1;
1442}
1443
1444__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1445
1446/* Check for resource conflicts between ACPI OperationRegions and native
1447 * drivers */
1448int acpi_check_resource_conflict(const struct resource *res)
1449{
1450 acpi_adr_space_type space_id;
1451 acpi_size length;
1452 u8 warn = 0;
1453 int clash = 0;
1454
1455 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1456 return 0;
1457 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1458 return 0;
1459
1460 if (res->flags & IORESOURCE_IO)
1461 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1462 else
1463 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1464
1465 length = resource_size(res);
1466 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1467 warn = 1;
1468 clash = acpi_check_address_range(space_id, res->start, length, warn);
1469
1470 if (clash) {
1471 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1472 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1473 printk(KERN_NOTICE "ACPI: This conflict may"
1474 " cause random problems and system"
1475 " instability\n");
1476 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1477 " for this device, you should use it instead of"
1478 " the native driver\n");
1479 }
1480 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1481 return -EBUSY;
1482 }
1483 return 0;
1484}
1485EXPORT_SYMBOL(acpi_check_resource_conflict);
1486
1487int acpi_check_region(resource_size_t start, resource_size_t n,
1488 const char *name)
1489{
1490 struct resource res = {
1491 .start = start,
1492 .end = start + n - 1,
1493 .name = name,
1494 .flags = IORESOURCE_IO,
1495 };
1496
1497 return acpi_check_resource_conflict(&res);
1498}
1499EXPORT_SYMBOL(acpi_check_region);
1500
1501static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1502 void *_res, void **return_value)
1503{
1504 struct acpi_mem_space_context **mem_ctx;
1505 union acpi_operand_object *handler_obj;
1506 union acpi_operand_object *region_obj2;
1507 union acpi_operand_object *region_obj;
1508 struct resource *res = _res;
1509 acpi_status status;
1510
1511 region_obj = acpi_ns_get_attached_object(handle);
1512 if (!region_obj)
1513 return AE_OK;
1514
1515 handler_obj = region_obj->region.handler;
1516 if (!handler_obj)
1517 return AE_OK;
1518
1519 if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1520 return AE_OK;
1521
1522 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1523 return AE_OK;
1524
1525 region_obj2 = acpi_ns_get_secondary_object(region_obj);
1526 if (!region_obj2)
1527 return AE_OK;
1528
1529 mem_ctx = (void *)®ion_obj2->extra.region_context;
1530
1531 if (!(mem_ctx[0]->address >= res->start &&
1532 mem_ctx[0]->address < res->end))
1533 return AE_OK;
1534
1535 status = handler_obj->address_space.setup(region_obj,
1536 ACPI_REGION_DEACTIVATE,
1537 NULL, (void **)mem_ctx);
1538 if (ACPI_SUCCESS(status))
1539 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1540
1541 return status;
1542}
1543
1544/**
1545 * acpi_release_memory - Release any mappings done to a memory region
1546 * @handle: Handle to namespace node
1547 * @res: Memory resource
1548 * @level: A level that terminates the search
1549 *
1550 * Walks through @handle and unmaps all SystemMemory Operation Regions that
1551 * overlap with @res and that have already been activated (mapped).
1552 *
1553 * This is a helper that allows drivers to place special requirements on memory
1554 * region that may overlap with operation regions, primarily allowing them to
1555 * safely map the region as non-cached memory.
1556 *
1557 * The unmapped Operation Regions will be automatically remapped next time they
1558 * are called, so the drivers do not need to do anything else.
1559 */
1560acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1561 u32 level)
1562{
1563 if (!(res->flags & IORESOURCE_MEM))
1564 return AE_TYPE;
1565
1566 return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1567 acpi_deactivate_mem_region, NULL, res, NULL);
1568}
1569EXPORT_SYMBOL_GPL(acpi_release_memory);
1570
1571/*
1572 * Let drivers know whether the resource checks are effective
1573 */
1574int acpi_resources_are_enforced(void)
1575{
1576 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1577}
1578EXPORT_SYMBOL(acpi_resources_are_enforced);
1579
1580/*
1581 * Deallocate the memory for a spinlock.
1582 */
1583void acpi_os_delete_lock(acpi_spinlock handle)
1584{
1585 ACPI_FREE(handle);
1586}
1587
1588/*
1589 * Acquire a spinlock.
1590 *
1591 * handle is a pointer to the spinlock_t.
1592 */
1593
1594acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1595{
1596 acpi_cpu_flags flags;
1597 spin_lock_irqsave(lockp, flags);
1598 return flags;
1599}
1600
1601/*
1602 * Release a spinlock. See above.
1603 */
1604
1605void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1606{
1607 spin_unlock_irqrestore(lockp, flags);
1608}
1609
1610#ifndef ACPI_USE_LOCAL_CACHE
1611
1612/*******************************************************************************
1613 *
1614 * FUNCTION: acpi_os_create_cache
1615 *
1616 * PARAMETERS: name - Ascii name for the cache
1617 * size - Size of each cached object
1618 * depth - Maximum depth of the cache (in objects) <ignored>
1619 * cache - Where the new cache object is returned
1620 *
1621 * RETURN: status
1622 *
1623 * DESCRIPTION: Create a cache object
1624 *
1625 ******************************************************************************/
1626
1627acpi_status
1628acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1629{
1630 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1631 if (*cache == NULL)
1632 return AE_ERROR;
1633 else
1634 return AE_OK;
1635}
1636
1637/*******************************************************************************
1638 *
1639 * FUNCTION: acpi_os_purge_cache
1640 *
1641 * PARAMETERS: Cache - Handle to cache object
1642 *
1643 * RETURN: Status
1644 *
1645 * DESCRIPTION: Free all objects within the requested cache.
1646 *
1647 ******************************************************************************/
1648
1649acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1650{
1651 kmem_cache_shrink(cache);
1652 return (AE_OK);
1653}
1654
1655/*******************************************************************************
1656 *
1657 * FUNCTION: acpi_os_delete_cache
1658 *
1659 * PARAMETERS: Cache - Handle to cache object
1660 *
1661 * RETURN: Status
1662 *
1663 * DESCRIPTION: Free all objects within the requested cache and delete the
1664 * cache object.
1665 *
1666 ******************************************************************************/
1667
1668acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1669{
1670 kmem_cache_destroy(cache);
1671 return (AE_OK);
1672}
1673
1674/*******************************************************************************
1675 *
1676 * FUNCTION: acpi_os_release_object
1677 *
1678 * PARAMETERS: Cache - Handle to cache object
1679 * Object - The object to be released
1680 *
1681 * RETURN: None
1682 *
1683 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1684 * the object is deleted.
1685 *
1686 ******************************************************************************/
1687
1688acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1689{
1690 kmem_cache_free(cache, object);
1691 return (AE_OK);
1692}
1693#endif
1694
1695static int __init acpi_no_static_ssdt_setup(char *s)
1696{
1697 acpi_gbl_disable_ssdt_table_install = TRUE;
1698 pr_info("ACPI: static SSDT installation disabled\n");
1699
1700 return 0;
1701}
1702
1703early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1704
1705static int __init acpi_disable_return_repair(char *s)
1706{
1707 printk(KERN_NOTICE PREFIX
1708 "ACPI: Predefined validation mechanism disabled\n");
1709 acpi_gbl_disable_auto_repair = TRUE;
1710
1711 return 1;
1712}
1713
1714__setup("acpica_no_return_repair", acpi_disable_return_repair);
1715
1716acpi_status __init acpi_os_initialize(void)
1717{
1718 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1719 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1720 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1721 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1722 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1723 /*
1724 * Use acpi_os_map_generic_address to pre-map the reset
1725 * register if it's in system memory.
1726 */
1727 int rv;
1728
1729 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1730 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1731 }
1732 acpi_os_initialized = true;
1733
1734 return AE_OK;
1735}
1736
1737acpi_status __init acpi_os_initialize1(void)
1738{
1739 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1740 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1741 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1742 BUG_ON(!kacpid_wq);
1743 BUG_ON(!kacpi_notify_wq);
1744 BUG_ON(!kacpi_hotplug_wq);
1745 acpi_osi_init();
1746 return AE_OK;
1747}
1748
1749acpi_status acpi_os_terminate(void)
1750{
1751 if (acpi_irq_handler) {
1752 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1753 acpi_irq_handler);
1754 }
1755
1756 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1757 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1758 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1759 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1760 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1761 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1762
1763 destroy_workqueue(kacpid_wq);
1764 destroy_workqueue(kacpi_notify_wq);
1765 destroy_workqueue(kacpi_hotplug_wq);
1766
1767 return AE_OK;
1768}
1769
1770acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1771 u32 pm1b_control)
1772{
1773 int rc = 0;
1774 if (__acpi_os_prepare_sleep)
1775 rc = __acpi_os_prepare_sleep(sleep_state,
1776 pm1a_control, pm1b_control);
1777 if (rc < 0)
1778 return AE_ERROR;
1779 else if (rc > 0)
1780 return AE_CTRL_TERMINATE;
1781
1782 return AE_OK;
1783}
1784
1785void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1786 u32 pm1a_ctrl, u32 pm1b_ctrl))
1787{
1788 __acpi_os_prepare_sleep = func;
1789}
1790
1791#if (ACPI_REDUCED_HARDWARE)
1792acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1793 u32 val_b)
1794{
1795 int rc = 0;
1796 if (__acpi_os_prepare_extended_sleep)
1797 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1798 val_a, val_b);
1799 if (rc < 0)
1800 return AE_ERROR;
1801 else if (rc > 0)
1802 return AE_CTRL_TERMINATE;
1803
1804 return AE_OK;
1805}
1806#else
1807acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1808 u32 val_b)
1809{
1810 return AE_OK;
1811}
1812#endif
1813
1814void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1815 u32 val_a, u32 val_b))
1816{
1817 __acpi_os_prepare_extended_sleep = func;
1818}
1819
1820acpi_status acpi_os_enter_sleep(u8 sleep_state,
1821 u32 reg_a_value, u32 reg_b_value)
1822{
1823 acpi_status status;
1824
1825 if (acpi_gbl_reduced_hardware)
1826 status = acpi_os_prepare_extended_sleep(sleep_state,
1827 reg_a_value,
1828 reg_b_value);
1829 else
1830 status = acpi_os_prepare_sleep(sleep_state,
1831 reg_a_value, reg_b_value);
1832 return status;
1833}
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/acpi_io.h>
43#include <linux/efi.h>
44#include <linux/ioport.h>
45#include <linux/list.h>
46#include <linux/jiffies.h>
47#include <linux/semaphore.h>
48
49#include <asm/io.h>
50#include <asm/uaccess.h>
51
52#include <acpi/acpi.h>
53#include <acpi/acpi_bus.h>
54#include <acpi/processor.h>
55
56#define _COMPONENT ACPI_OS_SERVICES
57ACPI_MODULE_NAME("osl");
58#define PREFIX "ACPI: "
59struct acpi_os_dpc {
60 acpi_osd_exec_callback function;
61 void *context;
62 struct work_struct work;
63 int wait;
64};
65
66#ifdef CONFIG_ACPI_CUSTOM_DSDT
67#include CONFIG_ACPI_CUSTOM_DSDT_FILE
68#endif
69
70#ifdef ENABLE_DEBUGGER
71#include <linux/kdb.h>
72
73/* stuff for debugger support */
74int acpi_in_debugger;
75EXPORT_SYMBOL(acpi_in_debugger);
76
77extern char line_buf[80];
78#endif /*ENABLE_DEBUGGER */
79
80static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81 u32 pm1b_ctrl);
82
83static acpi_osd_handler acpi_irq_handler;
84static void *acpi_irq_context;
85static struct workqueue_struct *kacpid_wq;
86static struct workqueue_struct *kacpi_notify_wq;
87struct workqueue_struct *kacpi_hotplug_wq;
88EXPORT_SYMBOL(kacpi_hotplug_wq);
89
90/*
91 * This list of permanent mappings is for memory that may be accessed from
92 * interrupt context, where we can't do the ioremap().
93 */
94struct acpi_ioremap {
95 struct list_head list;
96 void __iomem *virt;
97 acpi_physical_address phys;
98 acpi_size size;
99 unsigned long refcount;
100};
101
102static LIST_HEAD(acpi_ioremaps);
103static DEFINE_MUTEX(acpi_ioremap_lock);
104
105static void __init acpi_osi_setup_late(void);
106
107/*
108 * The story of _OSI(Linux)
109 *
110 * From pre-history through Linux-2.6.22,
111 * Linux responded TRUE upon a BIOS OSI(Linux) query.
112 *
113 * Unfortunately, reference BIOS writers got wind of this
114 * and put OSI(Linux) in their example code, quickly exposing
115 * this string as ill-conceived and opening the door to
116 * an un-bounded number of BIOS incompatibilities.
117 *
118 * For example, OSI(Linux) was used on resume to re-POST a
119 * video card on one system, because Linux at that time
120 * could not do a speedy restore in its native driver.
121 * But then upon gaining quick native restore capability,
122 * Linux has no way to tell the BIOS to skip the time-consuming
123 * POST -- putting Linux at a permanent performance disadvantage.
124 * On another system, the BIOS writer used OSI(Linux)
125 * to infer native OS support for IPMI! On other systems,
126 * OSI(Linux) simply got in the way of Linux claiming to
127 * be compatible with other operating systems, exposing
128 * BIOS issues such as skipped device initialization.
129 *
130 * So "Linux" turned out to be a really poor chose of
131 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132 *
133 * BIOS writers should NOT query _OSI(Linux) on future systems.
134 * Linux will complain on the console when it sees it, and return FALSE.
135 * To get Linux to return TRUE for your system will require
136 * a kernel source update to add a DMI entry,
137 * or boot with "acpi_osi=Linux"
138 */
139
140static struct osi_linux {
141 unsigned int enable:1;
142 unsigned int dmi:1;
143 unsigned int cmdline:1;
144} osi_linux = {0, 0, 0};
145
146static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147{
148 if (!strcmp("Linux", interface)) {
149
150 printk_once(KERN_NOTICE FW_BUG PREFIX
151 "BIOS _OSI(Linux) query %s%s\n",
152 osi_linux.enable ? "honored" : "ignored",
153 osi_linux.cmdline ? " via cmdline" :
154 osi_linux.dmi ? " via DMI" : "");
155 }
156
157 return supported;
158}
159
160static void __init acpi_request_region (struct acpi_generic_address *gas,
161 unsigned int length, char *desc)
162{
163 u64 addr;
164
165 /* Handle possible alignment issues */
166 memcpy(&addr, &gas->address, sizeof(addr));
167 if (!addr || !length)
168 return;
169
170 /* Resources are never freed */
171 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
172 request_region(addr, length, desc);
173 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
174 request_mem_region(addr, length, desc);
175}
176
177static int __init acpi_reserve_resources(void)
178{
179 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
180 "ACPI PM1a_EVT_BLK");
181
182 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
183 "ACPI PM1b_EVT_BLK");
184
185 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
186 "ACPI PM1a_CNT_BLK");
187
188 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
189 "ACPI PM1b_CNT_BLK");
190
191 if (acpi_gbl_FADT.pm_timer_length == 4)
192 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193
194 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
195 "ACPI PM2_CNT_BLK");
196
197 /* Length of GPE blocks must be a non-negative multiple of 2 */
198
199 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
200 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
201 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202
203 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
204 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
205 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206
207 return 0;
208}
209device_initcall(acpi_reserve_resources);
210
211void acpi_os_printf(const char *fmt, ...)
212{
213 va_list args;
214 va_start(args, fmt);
215 acpi_os_vprintf(fmt, args);
216 va_end(args);
217}
218
219void acpi_os_vprintf(const char *fmt, va_list args)
220{
221 static char buffer[512];
222
223 vsprintf(buffer, fmt, args);
224
225#ifdef ENABLE_DEBUGGER
226 if (acpi_in_debugger) {
227 kdb_printf("%s", buffer);
228 } else {
229 printk(KERN_CONT "%s", buffer);
230 }
231#else
232 printk(KERN_CONT "%s", buffer);
233#endif
234}
235
236#ifdef CONFIG_KEXEC
237static unsigned long acpi_rsdp;
238static int __init setup_acpi_rsdp(char *arg)
239{
240 acpi_rsdp = simple_strtoul(arg, NULL, 16);
241 return 0;
242}
243early_param("acpi_rsdp", setup_acpi_rsdp);
244#endif
245
246acpi_physical_address __init acpi_os_get_root_pointer(void)
247{
248#ifdef CONFIG_KEXEC
249 if (acpi_rsdp)
250 return acpi_rsdp;
251#endif
252
253 if (efi_enabled) {
254 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
255 return efi.acpi20;
256 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
257 return efi.acpi;
258 else {
259 printk(KERN_ERR PREFIX
260 "System description tables not found\n");
261 return 0;
262 }
263 } else {
264 acpi_physical_address pa = 0;
265
266 acpi_find_root_pointer(&pa);
267 return pa;
268 }
269}
270
271/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272static struct acpi_ioremap *
273acpi_map_lookup(acpi_physical_address phys, acpi_size size)
274{
275 struct acpi_ioremap *map;
276
277 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
278 if (map->phys <= phys &&
279 phys + size <= map->phys + map->size)
280 return map;
281
282 return NULL;
283}
284
285/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286static void __iomem *
287acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
288{
289 struct acpi_ioremap *map;
290
291 map = acpi_map_lookup(phys, size);
292 if (map)
293 return map->virt + (phys - map->phys);
294
295 return NULL;
296}
297
298void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
299{
300 struct acpi_ioremap *map;
301 void __iomem *virt = NULL;
302
303 mutex_lock(&acpi_ioremap_lock);
304 map = acpi_map_lookup(phys, size);
305 if (map) {
306 virt = map->virt + (phys - map->phys);
307 map->refcount++;
308 }
309 mutex_unlock(&acpi_ioremap_lock);
310 return virt;
311}
312EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
313
314/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315static struct acpi_ioremap *
316acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
317{
318 struct acpi_ioremap *map;
319
320 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
321 if (map->virt <= virt &&
322 virt + size <= map->virt + map->size)
323 return map;
324
325 return NULL;
326}
327
328#ifndef CONFIG_IA64
329#define should_use_kmap(pfn) page_is_ram(pfn)
330#else
331/* ioremap will take care of cache attributes */
332#define should_use_kmap(pfn) 0
333#endif
334
335static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336{
337 unsigned long pfn;
338
339 pfn = pg_off >> PAGE_SHIFT;
340 if (should_use_kmap(pfn)) {
341 if (pg_sz > PAGE_SIZE)
342 return NULL;
343 return (void __iomem __force *)kmap(pfn_to_page(pfn));
344 } else
345 return acpi_os_ioremap(pg_off, pg_sz);
346}
347
348static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349{
350 unsigned long pfn;
351
352 pfn = pg_off >> PAGE_SHIFT;
353 if (should_use_kmap(pfn))
354 kunmap(pfn_to_page(pfn));
355 else
356 iounmap(vaddr);
357}
358
359void __iomem *__init_refok
360acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
361{
362 struct acpi_ioremap *map;
363 void __iomem *virt;
364 acpi_physical_address pg_off;
365 acpi_size pg_sz;
366
367 if (phys > ULONG_MAX) {
368 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369 return NULL;
370 }
371
372 if (!acpi_gbl_permanent_mmap)
373 return __acpi_map_table((unsigned long)phys, size);
374
375 mutex_lock(&acpi_ioremap_lock);
376 /* Check if there's a suitable mapping already. */
377 map = acpi_map_lookup(phys, size);
378 if (map) {
379 map->refcount++;
380 goto out;
381 }
382
383 map = kzalloc(sizeof(*map), GFP_KERNEL);
384 if (!map) {
385 mutex_unlock(&acpi_ioremap_lock);
386 return NULL;
387 }
388
389 pg_off = round_down(phys, PAGE_SIZE);
390 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
391 virt = acpi_map(pg_off, pg_sz);
392 if (!virt) {
393 mutex_unlock(&acpi_ioremap_lock);
394 kfree(map);
395 return NULL;
396 }
397
398 INIT_LIST_HEAD(&map->list);
399 map->virt = virt;
400 map->phys = pg_off;
401 map->size = pg_sz;
402 map->refcount = 1;
403
404 list_add_tail_rcu(&map->list, &acpi_ioremaps);
405
406 out:
407 mutex_unlock(&acpi_ioremap_lock);
408 return map->virt + (phys - map->phys);
409}
410EXPORT_SYMBOL_GPL(acpi_os_map_memory);
411
412static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
413{
414 if (!--map->refcount)
415 list_del_rcu(&map->list);
416}
417
418static void acpi_os_map_cleanup(struct acpi_ioremap *map)
419{
420 if (!map->refcount) {
421 synchronize_rcu();
422 acpi_unmap(map->phys, map->virt);
423 kfree(map);
424 }
425}
426
427void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
428{
429 struct acpi_ioremap *map;
430
431 if (!acpi_gbl_permanent_mmap) {
432 __acpi_unmap_table(virt, size);
433 return;
434 }
435
436 mutex_lock(&acpi_ioremap_lock);
437 map = acpi_map_lookup_virt(virt, size);
438 if (!map) {
439 mutex_unlock(&acpi_ioremap_lock);
440 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
441 return;
442 }
443 acpi_os_drop_map_ref(map);
444 mutex_unlock(&acpi_ioremap_lock);
445
446 acpi_os_map_cleanup(map);
447}
448EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
451{
452 if (!acpi_gbl_permanent_mmap)
453 __acpi_unmap_table(virt, size);
454}
455
456int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457{
458 u64 addr;
459 void __iomem *virt;
460
461 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462 return 0;
463
464 /* Handle possible alignment issues */
465 memcpy(&addr, &gas->address, sizeof(addr));
466 if (!addr || !gas->bit_width)
467 return -EINVAL;
468
469 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
470 if (!virt)
471 return -EIO;
472
473 return 0;
474}
475EXPORT_SYMBOL(acpi_os_map_generic_address);
476
477void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
478{
479 u64 addr;
480 struct acpi_ioremap *map;
481
482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 return;
484
485 /* Handle possible alignment issues */
486 memcpy(&addr, &gas->address, sizeof(addr));
487 if (!addr || !gas->bit_width)
488 return;
489
490 mutex_lock(&acpi_ioremap_lock);
491 map = acpi_map_lookup(addr, gas->bit_width / 8);
492 if (!map) {
493 mutex_unlock(&acpi_ioremap_lock);
494 return;
495 }
496 acpi_os_drop_map_ref(map);
497 mutex_unlock(&acpi_ioremap_lock);
498
499 acpi_os_map_cleanup(map);
500}
501EXPORT_SYMBOL(acpi_os_unmap_generic_address);
502
503#ifdef ACPI_FUTURE_USAGE
504acpi_status
505acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
506{
507 if (!phys || !virt)
508 return AE_BAD_PARAMETER;
509
510 *phys = virt_to_phys(virt);
511
512 return AE_OK;
513}
514#endif
515
516#define ACPI_MAX_OVERRIDE_LEN 100
517
518static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519
520acpi_status
521acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
522 acpi_string * new_val)
523{
524 if (!init_val || !new_val)
525 return AE_BAD_PARAMETER;
526
527 *new_val = NULL;
528 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
529 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
530 acpi_os_name);
531 *new_val = acpi_os_name;
532 }
533
534 return AE_OK;
535}
536
537acpi_status
538acpi_os_table_override(struct acpi_table_header * existing_table,
539 struct acpi_table_header ** new_table)
540{
541 if (!existing_table || !new_table)
542 return AE_BAD_PARAMETER;
543
544 *new_table = NULL;
545
546#ifdef CONFIG_ACPI_CUSTOM_DSDT
547 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
548 *new_table = (struct acpi_table_header *)AmlCode;
549#endif
550 if (*new_table != NULL) {
551 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
552 "this is unsafe: tainting kernel\n",
553 existing_table->signature,
554 existing_table->oem_table_id);
555 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
556 }
557 return AE_OK;
558}
559
560acpi_status
561acpi_os_physical_table_override(struct acpi_table_header *existing_table,
562 acpi_physical_address * new_address,
563 u32 *new_table_length)
564{
565 return AE_SUPPORT;
566}
567
568
569static irqreturn_t acpi_irq(int irq, void *dev_id)
570{
571 u32 handled;
572
573 handled = (*acpi_irq_handler) (acpi_irq_context);
574
575 if (handled) {
576 acpi_irq_handled++;
577 return IRQ_HANDLED;
578 } else {
579 acpi_irq_not_handled++;
580 return IRQ_NONE;
581 }
582}
583
584acpi_status
585acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
586 void *context)
587{
588 unsigned int irq;
589
590 acpi_irq_stats_init();
591
592 /*
593 * ACPI interrupts different from the SCI in our copy of the FADT are
594 * not supported.
595 */
596 if (gsi != acpi_gbl_FADT.sci_interrupt)
597 return AE_BAD_PARAMETER;
598
599 if (acpi_irq_handler)
600 return AE_ALREADY_ACQUIRED;
601
602 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
603 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
604 gsi);
605 return AE_OK;
606 }
607
608 acpi_irq_handler = handler;
609 acpi_irq_context = context;
610 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
611 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
612 acpi_irq_handler = NULL;
613 return AE_NOT_ACQUIRED;
614 }
615
616 return AE_OK;
617}
618
619acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
620{
621 if (irq != acpi_gbl_FADT.sci_interrupt)
622 return AE_BAD_PARAMETER;
623
624 free_irq(irq, acpi_irq);
625 acpi_irq_handler = NULL;
626
627 return AE_OK;
628}
629
630/*
631 * Running in interpreter thread context, safe to sleep
632 */
633
634void acpi_os_sleep(u64 ms)
635{
636 schedule_timeout_interruptible(msecs_to_jiffies(ms));
637}
638
639void acpi_os_stall(u32 us)
640{
641 while (us) {
642 u32 delay = 1000;
643
644 if (delay > us)
645 delay = us;
646 udelay(delay);
647 touch_nmi_watchdog();
648 us -= delay;
649 }
650}
651
652/*
653 * Support ACPI 3.0 AML Timer operand
654 * Returns 64-bit free-running, monotonically increasing timer
655 * with 100ns granularity
656 */
657u64 acpi_os_get_timer(void)
658{
659 static u64 t;
660
661#ifdef CONFIG_HPET
662 /* TBD: use HPET if available */
663#endif
664
665#ifdef CONFIG_X86_PM_TIMER
666 /* TBD: default to PM timer if HPET was not available */
667#endif
668 if (!t)
669 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
670
671 return ++t;
672}
673
674acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
675{
676 u32 dummy;
677
678 if (!value)
679 value = &dummy;
680
681 *value = 0;
682 if (width <= 8) {
683 *(u8 *) value = inb(port);
684 } else if (width <= 16) {
685 *(u16 *) value = inw(port);
686 } else if (width <= 32) {
687 *(u32 *) value = inl(port);
688 } else {
689 BUG();
690 }
691
692 return AE_OK;
693}
694
695EXPORT_SYMBOL(acpi_os_read_port);
696
697acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
698{
699 if (width <= 8) {
700 outb(value, port);
701 } else if (width <= 16) {
702 outw(value, port);
703 } else if (width <= 32) {
704 outl(value, port);
705 } else {
706 BUG();
707 }
708
709 return AE_OK;
710}
711
712EXPORT_SYMBOL(acpi_os_write_port);
713
714#ifdef readq
715static inline u64 read64(const volatile void __iomem *addr)
716{
717 return readq(addr);
718}
719#else
720static inline u64 read64(const volatile void __iomem *addr)
721{
722 u64 l, h;
723 l = readl(addr);
724 h = readl(addr+4);
725 return l | (h << 32);
726}
727#endif
728
729acpi_status
730acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
731{
732 void __iomem *virt_addr;
733 unsigned int size = width / 8;
734 bool unmap = false;
735 u64 dummy;
736
737 rcu_read_lock();
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
739 if (!virt_addr) {
740 rcu_read_unlock();
741 virt_addr = acpi_os_ioremap(phys_addr, size);
742 if (!virt_addr)
743 return AE_BAD_ADDRESS;
744 unmap = true;
745 }
746
747 if (!value)
748 value = &dummy;
749
750 switch (width) {
751 case 8:
752 *(u8 *) value = readb(virt_addr);
753 break;
754 case 16:
755 *(u16 *) value = readw(virt_addr);
756 break;
757 case 32:
758 *(u32 *) value = readl(virt_addr);
759 break;
760 case 64:
761 *(u64 *) value = read64(virt_addr);
762 break;
763 default:
764 BUG();
765 }
766
767 if (unmap)
768 iounmap(virt_addr);
769 else
770 rcu_read_unlock();
771
772 return AE_OK;
773}
774
775#ifdef writeq
776static inline void write64(u64 val, volatile void __iomem *addr)
777{
778 writeq(val, addr);
779}
780#else
781static inline void write64(u64 val, volatile void __iomem *addr)
782{
783 writel(val, addr);
784 writel(val>>32, addr+4);
785}
786#endif
787
788acpi_status
789acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
790{
791 void __iomem *virt_addr;
792 unsigned int size = width / 8;
793 bool unmap = false;
794
795 rcu_read_lock();
796 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
797 if (!virt_addr) {
798 rcu_read_unlock();
799 virt_addr = acpi_os_ioremap(phys_addr, size);
800 if (!virt_addr)
801 return AE_BAD_ADDRESS;
802 unmap = true;
803 }
804
805 switch (width) {
806 case 8:
807 writeb(value, virt_addr);
808 break;
809 case 16:
810 writew(value, virt_addr);
811 break;
812 case 32:
813 writel(value, virt_addr);
814 break;
815 case 64:
816 write64(value, virt_addr);
817 break;
818 default:
819 BUG();
820 }
821
822 if (unmap)
823 iounmap(virt_addr);
824 else
825 rcu_read_unlock();
826
827 return AE_OK;
828}
829
830acpi_status
831acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
832 u64 *value, u32 width)
833{
834 int result, size;
835 u32 value32;
836
837 if (!value)
838 return AE_BAD_PARAMETER;
839
840 switch (width) {
841 case 8:
842 size = 1;
843 break;
844 case 16:
845 size = 2;
846 break;
847 case 32:
848 size = 4;
849 break;
850 default:
851 return AE_ERROR;
852 }
853
854 result = raw_pci_read(pci_id->segment, pci_id->bus,
855 PCI_DEVFN(pci_id->device, pci_id->function),
856 reg, size, &value32);
857 *value = value32;
858
859 return (result ? AE_ERROR : AE_OK);
860}
861
862acpi_status
863acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
864 u64 value, u32 width)
865{
866 int result, size;
867
868 switch (width) {
869 case 8:
870 size = 1;
871 break;
872 case 16:
873 size = 2;
874 break;
875 case 32:
876 size = 4;
877 break;
878 default:
879 return AE_ERROR;
880 }
881
882 result = raw_pci_write(pci_id->segment, pci_id->bus,
883 PCI_DEVFN(pci_id->device, pci_id->function),
884 reg, size, value);
885
886 return (result ? AE_ERROR : AE_OK);
887}
888
889static void acpi_os_execute_deferred(struct work_struct *work)
890{
891 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
892
893 if (dpc->wait)
894 acpi_os_wait_events_complete(NULL);
895
896 dpc->function(dpc->context);
897 kfree(dpc);
898}
899
900/*******************************************************************************
901 *
902 * FUNCTION: acpi_os_execute
903 *
904 * PARAMETERS: Type - Type of the callback
905 * Function - Function to be executed
906 * Context - Function parameters
907 *
908 * RETURN: Status
909 *
910 * DESCRIPTION: Depending on type, either queues function for deferred execution or
911 * immediately executes function on a separate thread.
912 *
913 ******************************************************************************/
914
915static acpi_status __acpi_os_execute(acpi_execute_type type,
916 acpi_osd_exec_callback function, void *context, int hp)
917{
918 acpi_status status = AE_OK;
919 struct acpi_os_dpc *dpc;
920 struct workqueue_struct *queue;
921 int ret;
922 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
923 "Scheduling function [%p(%p)] for deferred execution.\n",
924 function, context));
925
926 /*
927 * Allocate/initialize DPC structure. Note that this memory will be
928 * freed by the callee. The kernel handles the work_struct list in a
929 * way that allows us to also free its memory inside the callee.
930 * Because we may want to schedule several tasks with different
931 * parameters we can't use the approach some kernel code uses of
932 * having a static work_struct.
933 */
934
935 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
936 if (!dpc)
937 return AE_NO_MEMORY;
938
939 dpc->function = function;
940 dpc->context = context;
941
942 /*
943 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
944 * because the hotplug code may call driver .remove() functions,
945 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
946 * to flush these workqueues.
947 */
948 queue = hp ? kacpi_hotplug_wq :
949 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
950 dpc->wait = hp ? 1 : 0;
951
952 if (queue == kacpi_hotplug_wq)
953 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
954 else if (queue == kacpi_notify_wq)
955 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
956 else
957 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
958
959 /*
960 * On some machines, a software-initiated SMI causes corruption unless
961 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
962 * typically it's done in GPE-related methods that are run via
963 * workqueues, so we can avoid the known corruption cases by always
964 * queueing on CPU 0.
965 */
966 ret = queue_work_on(0, queue, &dpc->work);
967
968 if (!ret) {
969 printk(KERN_ERR PREFIX
970 "Call to queue_work() failed.\n");
971 status = AE_ERROR;
972 kfree(dpc);
973 }
974 return status;
975}
976
977acpi_status acpi_os_execute(acpi_execute_type type,
978 acpi_osd_exec_callback function, void *context)
979{
980 return __acpi_os_execute(type, function, context, 0);
981}
982EXPORT_SYMBOL(acpi_os_execute);
983
984acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
985 void *context)
986{
987 return __acpi_os_execute(0, function, context, 1);
988}
989
990void acpi_os_wait_events_complete(void *context)
991{
992 flush_workqueue(kacpid_wq);
993 flush_workqueue(kacpi_notify_wq);
994}
995
996EXPORT_SYMBOL(acpi_os_wait_events_complete);
997
998acpi_status
999acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1000{
1001 struct semaphore *sem = NULL;
1002
1003 sem = acpi_os_allocate(sizeof(struct semaphore));
1004 if (!sem)
1005 return AE_NO_MEMORY;
1006 memset(sem, 0, sizeof(struct semaphore));
1007
1008 sema_init(sem, initial_units);
1009
1010 *handle = (acpi_handle *) sem;
1011
1012 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1013 *handle, initial_units));
1014
1015 return AE_OK;
1016}
1017
1018/*
1019 * TODO: A better way to delete semaphores? Linux doesn't have a
1020 * 'delete_semaphore()' function -- may result in an invalid
1021 * pointer dereference for non-synchronized consumers. Should
1022 * we at least check for blocked threads and signal/cancel them?
1023 */
1024
1025acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1026{
1027 struct semaphore *sem = (struct semaphore *)handle;
1028
1029 if (!sem)
1030 return AE_BAD_PARAMETER;
1031
1032 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1033
1034 BUG_ON(!list_empty(&sem->wait_list));
1035 kfree(sem);
1036 sem = NULL;
1037
1038 return AE_OK;
1039}
1040
1041/*
1042 * TODO: Support for units > 1?
1043 */
1044acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1045{
1046 acpi_status status = AE_OK;
1047 struct semaphore *sem = (struct semaphore *)handle;
1048 long jiffies;
1049 int ret = 0;
1050
1051 if (!sem || (units < 1))
1052 return AE_BAD_PARAMETER;
1053
1054 if (units > 1)
1055 return AE_SUPPORT;
1056
1057 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1058 handle, units, timeout));
1059
1060 if (timeout == ACPI_WAIT_FOREVER)
1061 jiffies = MAX_SCHEDULE_TIMEOUT;
1062 else
1063 jiffies = msecs_to_jiffies(timeout);
1064
1065 ret = down_timeout(sem, jiffies);
1066 if (ret)
1067 status = AE_TIME;
1068
1069 if (ACPI_FAILURE(status)) {
1070 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1071 "Failed to acquire semaphore[%p|%d|%d], %s",
1072 handle, units, timeout,
1073 acpi_format_exception(status)));
1074 } else {
1075 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1076 "Acquired semaphore[%p|%d|%d]", handle,
1077 units, timeout));
1078 }
1079
1080 return status;
1081}
1082
1083/*
1084 * TODO: Support for units > 1?
1085 */
1086acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1087{
1088 struct semaphore *sem = (struct semaphore *)handle;
1089
1090 if (!sem || (units < 1))
1091 return AE_BAD_PARAMETER;
1092
1093 if (units > 1)
1094 return AE_SUPPORT;
1095
1096 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1097 units));
1098
1099 up(sem);
1100
1101 return AE_OK;
1102}
1103
1104#ifdef ACPI_FUTURE_USAGE
1105u32 acpi_os_get_line(char *buffer)
1106{
1107
1108#ifdef ENABLE_DEBUGGER
1109 if (acpi_in_debugger) {
1110 u32 chars;
1111
1112 kdb_read(buffer, sizeof(line_buf));
1113
1114 /* remove the CR kdb includes */
1115 chars = strlen(buffer) - 1;
1116 buffer[chars] = '\0';
1117 }
1118#endif
1119
1120 return 0;
1121}
1122#endif /* ACPI_FUTURE_USAGE */
1123
1124acpi_status acpi_os_signal(u32 function, void *info)
1125{
1126 switch (function) {
1127 case ACPI_SIGNAL_FATAL:
1128 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1129 break;
1130 case ACPI_SIGNAL_BREAKPOINT:
1131 /*
1132 * AML Breakpoint
1133 * ACPI spec. says to treat it as a NOP unless
1134 * you are debugging. So if/when we integrate
1135 * AML debugger into the kernel debugger its
1136 * hook will go here. But until then it is
1137 * not useful to print anything on breakpoints.
1138 */
1139 break;
1140 default:
1141 break;
1142 }
1143
1144 return AE_OK;
1145}
1146
1147static int __init acpi_os_name_setup(char *str)
1148{
1149 char *p = acpi_os_name;
1150 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1151
1152 if (!str || !*str)
1153 return 0;
1154
1155 for (; count-- && str && *str; str++) {
1156 if (isalnum(*str) || *str == ' ' || *str == ':')
1157 *p++ = *str;
1158 else if (*str == '\'' || *str == '"')
1159 continue;
1160 else
1161 break;
1162 }
1163 *p = 0;
1164
1165 return 1;
1166
1167}
1168
1169__setup("acpi_os_name=", acpi_os_name_setup);
1170
1171#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1172#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1173
1174struct osi_setup_entry {
1175 char string[OSI_STRING_LENGTH_MAX];
1176 bool enable;
1177};
1178
1179static struct osi_setup_entry __initdata
1180 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1181 {"Module Device", true},
1182 {"Processor Device", true},
1183 {"3.0 _SCP Extensions", true},
1184 {"Processor Aggregator Device", true},
1185};
1186
1187void __init acpi_osi_setup(char *str)
1188{
1189 struct osi_setup_entry *osi;
1190 bool enable = true;
1191 int i;
1192
1193 if (!acpi_gbl_create_osi_method)
1194 return;
1195
1196 if (str == NULL || *str == '\0') {
1197 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1198 acpi_gbl_create_osi_method = FALSE;
1199 return;
1200 }
1201
1202 if (*str == '!') {
1203 str++;
1204 enable = false;
1205 }
1206
1207 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1208 osi = &osi_setup_entries[i];
1209 if (!strcmp(osi->string, str)) {
1210 osi->enable = enable;
1211 break;
1212 } else if (osi->string[0] == '\0') {
1213 osi->enable = enable;
1214 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1215 break;
1216 }
1217 }
1218}
1219
1220static void __init set_osi_linux(unsigned int enable)
1221{
1222 if (osi_linux.enable != enable)
1223 osi_linux.enable = enable;
1224
1225 if (osi_linux.enable)
1226 acpi_osi_setup("Linux");
1227 else
1228 acpi_osi_setup("!Linux");
1229
1230 return;
1231}
1232
1233static void __init acpi_cmdline_osi_linux(unsigned int enable)
1234{
1235 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1236 osi_linux.dmi = 0;
1237 set_osi_linux(enable);
1238
1239 return;
1240}
1241
1242void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1243{
1244 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1245
1246 if (enable == -1)
1247 return;
1248
1249 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1250 set_osi_linux(enable);
1251
1252 return;
1253}
1254
1255/*
1256 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1257 *
1258 * empty string disables _OSI
1259 * string starting with '!' disables that string
1260 * otherwise string is added to list, augmenting built-in strings
1261 */
1262static void __init acpi_osi_setup_late(void)
1263{
1264 struct osi_setup_entry *osi;
1265 char *str;
1266 int i;
1267 acpi_status status;
1268
1269 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1270 osi = &osi_setup_entries[i];
1271 str = osi->string;
1272
1273 if (*str == '\0')
1274 break;
1275 if (osi->enable) {
1276 status = acpi_install_interface(str);
1277
1278 if (ACPI_SUCCESS(status))
1279 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1280 } else {
1281 status = acpi_remove_interface(str);
1282
1283 if (ACPI_SUCCESS(status))
1284 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1285 }
1286 }
1287}
1288
1289static int __init osi_setup(char *str)
1290{
1291 if (str && !strcmp("Linux", str))
1292 acpi_cmdline_osi_linux(1);
1293 else if (str && !strcmp("!Linux", str))
1294 acpi_cmdline_osi_linux(0);
1295 else
1296 acpi_osi_setup(str);
1297
1298 return 1;
1299}
1300
1301__setup("acpi_osi=", osi_setup);
1302
1303/* enable serialization to combat AE_ALREADY_EXISTS errors */
1304static int __init acpi_serialize_setup(char *str)
1305{
1306 printk(KERN_INFO PREFIX "serialize enabled\n");
1307
1308 acpi_gbl_all_methods_serialized = TRUE;
1309
1310 return 1;
1311}
1312
1313__setup("acpi_serialize", acpi_serialize_setup);
1314
1315/* Check of resource interference between native drivers and ACPI
1316 * OperationRegions (SystemIO and System Memory only).
1317 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1318 * in arbitrary AML code and can interfere with legacy drivers.
1319 * acpi_enforce_resources= can be set to:
1320 *
1321 * - strict (default) (2)
1322 * -> further driver trying to access the resources will not load
1323 * - lax (1)
1324 * -> further driver trying to access the resources will load, but you
1325 * get a system message that something might go wrong...
1326 *
1327 * - no (0)
1328 * -> ACPI Operation Region resources will not be registered
1329 *
1330 */
1331#define ENFORCE_RESOURCES_STRICT 2
1332#define ENFORCE_RESOURCES_LAX 1
1333#define ENFORCE_RESOURCES_NO 0
1334
1335static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1336
1337static int __init acpi_enforce_resources_setup(char *str)
1338{
1339 if (str == NULL || *str == '\0')
1340 return 0;
1341
1342 if (!strcmp("strict", str))
1343 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1344 else if (!strcmp("lax", str))
1345 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1346 else if (!strcmp("no", str))
1347 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1348
1349 return 1;
1350}
1351
1352__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1353
1354/* Check for resource conflicts between ACPI OperationRegions and native
1355 * drivers */
1356int acpi_check_resource_conflict(const struct resource *res)
1357{
1358 acpi_adr_space_type space_id;
1359 acpi_size length;
1360 u8 warn = 0;
1361 int clash = 0;
1362
1363 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1364 return 0;
1365 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1366 return 0;
1367
1368 if (res->flags & IORESOURCE_IO)
1369 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1370 else
1371 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1372
1373 length = res->end - res->start + 1;
1374 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1375 warn = 1;
1376 clash = acpi_check_address_range(space_id, res->start, length, warn);
1377
1378 if (clash) {
1379 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1380 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1381 printk(KERN_NOTICE "ACPI: This conflict may"
1382 " cause random problems and system"
1383 " instability\n");
1384 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1385 " for this device, you should use it instead of"
1386 " the native driver\n");
1387 }
1388 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1389 return -EBUSY;
1390 }
1391 return 0;
1392}
1393EXPORT_SYMBOL(acpi_check_resource_conflict);
1394
1395int acpi_check_region(resource_size_t start, resource_size_t n,
1396 const char *name)
1397{
1398 struct resource res = {
1399 .start = start,
1400 .end = start + n - 1,
1401 .name = name,
1402 .flags = IORESOURCE_IO,
1403 };
1404
1405 return acpi_check_resource_conflict(&res);
1406}
1407EXPORT_SYMBOL(acpi_check_region);
1408
1409/*
1410 * Let drivers know whether the resource checks are effective
1411 */
1412int acpi_resources_are_enforced(void)
1413{
1414 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1415}
1416EXPORT_SYMBOL(acpi_resources_are_enforced);
1417
1418/*
1419 * Deallocate the memory for a spinlock.
1420 */
1421void acpi_os_delete_lock(acpi_spinlock handle)
1422{
1423 ACPI_FREE(handle);
1424}
1425
1426/*
1427 * Acquire a spinlock.
1428 *
1429 * handle is a pointer to the spinlock_t.
1430 */
1431
1432acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1433{
1434 acpi_cpu_flags flags;
1435 spin_lock_irqsave(lockp, flags);
1436 return flags;
1437}
1438
1439/*
1440 * Release a spinlock. See above.
1441 */
1442
1443void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1444{
1445 spin_unlock_irqrestore(lockp, flags);
1446}
1447
1448#ifndef ACPI_USE_LOCAL_CACHE
1449
1450/*******************************************************************************
1451 *
1452 * FUNCTION: acpi_os_create_cache
1453 *
1454 * PARAMETERS: name - Ascii name for the cache
1455 * size - Size of each cached object
1456 * depth - Maximum depth of the cache (in objects) <ignored>
1457 * cache - Where the new cache object is returned
1458 *
1459 * RETURN: status
1460 *
1461 * DESCRIPTION: Create a cache object
1462 *
1463 ******************************************************************************/
1464
1465acpi_status
1466acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1467{
1468 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1469 if (*cache == NULL)
1470 return AE_ERROR;
1471 else
1472 return AE_OK;
1473}
1474
1475/*******************************************************************************
1476 *
1477 * FUNCTION: acpi_os_purge_cache
1478 *
1479 * PARAMETERS: Cache - Handle to cache object
1480 *
1481 * RETURN: Status
1482 *
1483 * DESCRIPTION: Free all objects within the requested cache.
1484 *
1485 ******************************************************************************/
1486
1487acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1488{
1489 kmem_cache_shrink(cache);
1490 return (AE_OK);
1491}
1492
1493/*******************************************************************************
1494 *
1495 * FUNCTION: acpi_os_delete_cache
1496 *
1497 * PARAMETERS: Cache - Handle to cache object
1498 *
1499 * RETURN: Status
1500 *
1501 * DESCRIPTION: Free all objects within the requested cache and delete the
1502 * cache object.
1503 *
1504 ******************************************************************************/
1505
1506acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1507{
1508 kmem_cache_destroy(cache);
1509 return (AE_OK);
1510}
1511
1512/*******************************************************************************
1513 *
1514 * FUNCTION: acpi_os_release_object
1515 *
1516 * PARAMETERS: Cache - Handle to cache object
1517 * Object - The object to be released
1518 *
1519 * RETURN: None
1520 *
1521 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1522 * the object is deleted.
1523 *
1524 ******************************************************************************/
1525
1526acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1527{
1528 kmem_cache_free(cache, object);
1529 return (AE_OK);
1530}
1531#endif
1532
1533acpi_status __init acpi_os_initialize(void)
1534{
1535 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1536 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1537 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1538 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1539
1540 return AE_OK;
1541}
1542
1543acpi_status __init acpi_os_initialize1(void)
1544{
1545 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1546 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1547 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1548 BUG_ON(!kacpid_wq);
1549 BUG_ON(!kacpi_notify_wq);
1550 BUG_ON(!kacpi_hotplug_wq);
1551 acpi_install_interface_handler(acpi_osi_handler);
1552 acpi_osi_setup_late();
1553 return AE_OK;
1554}
1555
1556acpi_status acpi_os_terminate(void)
1557{
1558 if (acpi_irq_handler) {
1559 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1560 acpi_irq_handler);
1561 }
1562
1563 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1564 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1565 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1566 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1567
1568 destroy_workqueue(kacpid_wq);
1569 destroy_workqueue(kacpi_notify_wq);
1570 destroy_workqueue(kacpi_hotplug_wq);
1571
1572 return AE_OK;
1573}
1574
1575acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1576 u32 pm1b_control)
1577{
1578 int rc = 0;
1579 if (__acpi_os_prepare_sleep)
1580 rc = __acpi_os_prepare_sleep(sleep_state,
1581 pm1a_control, pm1b_control);
1582 if (rc < 0)
1583 return AE_ERROR;
1584 else if (rc > 0)
1585 return AE_CTRL_SKIP;
1586
1587 return AE_OK;
1588}
1589
1590void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1591 u32 pm1a_ctrl, u32 pm1b_ctrl))
1592{
1593 __acpi_os_prepare_sleep = func;
1594}