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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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/mm.h>
30#include <linux/highmem.h>
31#include <linux/pci.h>
32#include <linux/interrupt.h>
33#include <linux/kmod.h>
34#include <linux/delay.h>
35#include <linux/workqueue.h>
36#include <linux/nmi.h>
37#include <linux/acpi.h>
38#include <linux/efi.h>
39#include <linux/ioport.h>
40#include <linux/list.h>
41#include <linux/jiffies.h>
42#include <linux/semaphore.h>
43
44#include <asm/io.h>
45#include <asm/uaccess.h>
46#include <linux/io-64-nonatomic-lo-hi.h>
47
48#include "internal.h"
49
50#define _COMPONENT ACPI_OS_SERVICES
51ACPI_MODULE_NAME("osl");
52
53struct acpi_os_dpc {
54 acpi_osd_exec_callback function;
55 void *context;
56 struct work_struct work;
57};
58
59#ifdef CONFIG_ACPI_CUSTOM_DSDT
60#include CONFIG_ACPI_CUSTOM_DSDT_FILE
61#endif
62
63#ifdef ENABLE_DEBUGGER
64#include <linux/kdb.h>
65
66/* stuff for debugger support */
67int acpi_in_debugger;
68EXPORT_SYMBOL(acpi_in_debugger);
69#endif /*ENABLE_DEBUGGER */
70
71static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
72 u32 pm1b_ctrl);
73static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
74 u32 val_b);
75
76static acpi_osd_handler acpi_irq_handler;
77static void *acpi_irq_context;
78static struct workqueue_struct *kacpid_wq;
79static struct workqueue_struct *kacpi_notify_wq;
80static struct workqueue_struct *kacpi_hotplug_wq;
81static bool acpi_os_initialized;
82unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
83
84/*
85 * This list of permanent mappings is for memory that may be accessed from
86 * interrupt context, where we can't do the ioremap().
87 */
88struct acpi_ioremap {
89 struct list_head list;
90 void __iomem *virt;
91 acpi_physical_address phys;
92 acpi_size size;
93 unsigned long refcount;
94};
95
96static LIST_HEAD(acpi_ioremaps);
97static DEFINE_MUTEX(acpi_ioremap_lock);
98
99static void __init acpi_osi_setup_late(void);
100
101/*
102 * The story of _OSI(Linux)
103 *
104 * From pre-history through Linux-2.6.22,
105 * Linux responded TRUE upon a BIOS OSI(Linux) query.
106 *
107 * Unfortunately, reference BIOS writers got wind of this
108 * and put OSI(Linux) in their example code, quickly exposing
109 * this string as ill-conceived and opening the door to
110 * an un-bounded number of BIOS incompatibilities.
111 *
112 * For example, OSI(Linux) was used on resume to re-POST a
113 * video card on one system, because Linux at that time
114 * could not do a speedy restore in its native driver.
115 * But then upon gaining quick native restore capability,
116 * Linux has no way to tell the BIOS to skip the time-consuming
117 * POST -- putting Linux at a permanent performance disadvantage.
118 * On another system, the BIOS writer used OSI(Linux)
119 * to infer native OS support for IPMI! On other systems,
120 * OSI(Linux) simply got in the way of Linux claiming to
121 * be compatible with other operating systems, exposing
122 * BIOS issues such as skipped device initialization.
123 *
124 * So "Linux" turned out to be a really poor chose of
125 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
126 *
127 * BIOS writers should NOT query _OSI(Linux) on future systems.
128 * Linux will complain on the console when it sees it, and return FALSE.
129 * To get Linux to return TRUE for your system will require
130 * a kernel source update to add a DMI entry,
131 * or boot with "acpi_osi=Linux"
132 */
133
134static struct osi_linux {
135 unsigned int enable:1;
136 unsigned int dmi:1;
137 unsigned int cmdline:1;
138 unsigned int default_disabling:1;
139} osi_linux = {0, 0, 0, 0};
140
141static u32 acpi_osi_handler(acpi_string interface, u32 supported)
142{
143 if (!strcmp("Linux", interface)) {
144
145 printk_once(KERN_NOTICE FW_BUG PREFIX
146 "BIOS _OSI(Linux) query %s%s\n",
147 osi_linux.enable ? "honored" : "ignored",
148 osi_linux.cmdline ? " via cmdline" :
149 osi_linux.dmi ? " via DMI" : "");
150 }
151
152 if (!strcmp("Darwin", interface)) {
153 /*
154 * Apple firmware will behave poorly if it receives positive
155 * answers to "Darwin" and any other OS. Respond positively
156 * to Darwin and then disable all other vendor strings.
157 */
158 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
159 supported = ACPI_UINT32_MAX;
160 }
161
162 return supported;
163}
164
165static void __init acpi_request_region (struct acpi_generic_address *gas,
166 unsigned int length, char *desc)
167{
168 u64 addr;
169
170 /* Handle possible alignment issues */
171 memcpy(&addr, &gas->address, sizeof(addr));
172 if (!addr || !length)
173 return;
174
175 /* Resources are never freed */
176 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
177 request_region(addr, length, desc);
178 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
179 request_mem_region(addr, length, desc);
180}
181
182static int __init acpi_reserve_resources(void)
183{
184 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
185 "ACPI PM1a_EVT_BLK");
186
187 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
188 "ACPI PM1b_EVT_BLK");
189
190 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
191 "ACPI PM1a_CNT_BLK");
192
193 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
194 "ACPI PM1b_CNT_BLK");
195
196 if (acpi_gbl_FADT.pm_timer_length == 4)
197 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
198
199 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
200 "ACPI PM2_CNT_BLK");
201
202 /* Length of GPE blocks must be a non-negative multiple of 2 */
203
204 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
205 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
206 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
207
208 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
209 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
210 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
211
212 return 0;
213}
214fs_initcall_sync(acpi_reserve_resources);
215
216void acpi_os_printf(const char *fmt, ...)
217{
218 va_list args;
219 va_start(args, fmt);
220 acpi_os_vprintf(fmt, args);
221 va_end(args);
222}
223EXPORT_SYMBOL(acpi_os_printf);
224
225void acpi_os_vprintf(const char *fmt, va_list args)
226{
227 static char buffer[512];
228
229 vsprintf(buffer, fmt, args);
230
231#ifdef ENABLE_DEBUGGER
232 if (acpi_in_debugger) {
233 kdb_printf("%s", buffer);
234 } else {
235 printk(KERN_CONT "%s", buffer);
236 }
237#else
238 if (acpi_debugger_write_log(buffer) < 0)
239 printk(KERN_CONT "%s", buffer);
240#endif
241}
242
243#ifdef CONFIG_KEXEC
244static unsigned long acpi_rsdp;
245static int __init setup_acpi_rsdp(char *arg)
246{
247 if (kstrtoul(arg, 16, &acpi_rsdp))
248 return -EINVAL;
249 return 0;
250}
251early_param("acpi_rsdp", setup_acpi_rsdp);
252#endif
253
254acpi_physical_address __init acpi_os_get_root_pointer(void)
255{
256#ifdef CONFIG_KEXEC
257 if (acpi_rsdp)
258 return acpi_rsdp;
259#endif
260
261 if (efi_enabled(EFI_CONFIG_TABLES)) {
262 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
263 return efi.acpi20;
264 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
265 return efi.acpi;
266 else {
267 printk(KERN_ERR PREFIX
268 "System description tables not found\n");
269 return 0;
270 }
271 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
272 acpi_physical_address pa = 0;
273
274 acpi_find_root_pointer(&pa);
275 return pa;
276 }
277
278 return 0;
279}
280
281/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
282static struct acpi_ioremap *
283acpi_map_lookup(acpi_physical_address phys, acpi_size size)
284{
285 struct acpi_ioremap *map;
286
287 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
288 if (map->phys <= phys &&
289 phys + size <= map->phys + map->size)
290 return map;
291
292 return NULL;
293}
294
295/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
296static void __iomem *
297acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
298{
299 struct acpi_ioremap *map;
300
301 map = acpi_map_lookup(phys, size);
302 if (map)
303 return map->virt + (phys - map->phys);
304
305 return NULL;
306}
307
308void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
309{
310 struct acpi_ioremap *map;
311 void __iomem *virt = NULL;
312
313 mutex_lock(&acpi_ioremap_lock);
314 map = acpi_map_lookup(phys, size);
315 if (map) {
316 virt = map->virt + (phys - map->phys);
317 map->refcount++;
318 }
319 mutex_unlock(&acpi_ioremap_lock);
320 return virt;
321}
322EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
323
324/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
325static struct acpi_ioremap *
326acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
327{
328 struct acpi_ioremap *map;
329
330 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
331 if (map->virt <= virt &&
332 virt + size <= map->virt + map->size)
333 return map;
334
335 return NULL;
336}
337
338#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
339/* ioremap will take care of cache attributes */
340#define should_use_kmap(pfn) 0
341#else
342#define should_use_kmap(pfn) page_is_ram(pfn)
343#endif
344
345static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
346{
347 unsigned long pfn;
348
349 pfn = pg_off >> PAGE_SHIFT;
350 if (should_use_kmap(pfn)) {
351 if (pg_sz > PAGE_SIZE)
352 return NULL;
353 return (void __iomem __force *)kmap(pfn_to_page(pfn));
354 } else
355 return acpi_os_ioremap(pg_off, pg_sz);
356}
357
358static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
359{
360 unsigned long pfn;
361
362 pfn = pg_off >> PAGE_SHIFT;
363 if (should_use_kmap(pfn))
364 kunmap(pfn_to_page(pfn));
365 else
366 iounmap(vaddr);
367}
368
369/**
370 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
371 * @phys: Start of the physical address range to map.
372 * @size: Size of the physical address range to map.
373 *
374 * Look up the given physical address range in the list of existing ACPI memory
375 * mappings. If found, get a reference to it and return a pointer to it (its
376 * virtual address). If not found, map it, add it to that list and return a
377 * pointer to it.
378 *
379 * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
380 * routine simply calls __acpi_map_table() to get the job done.
381 */
382void __iomem *__init_refok
383acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
384{
385 struct acpi_ioremap *map;
386 void __iomem *virt;
387 acpi_physical_address pg_off;
388 acpi_size pg_sz;
389
390 if (phys > ULONG_MAX) {
391 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
392 return NULL;
393 }
394
395 if (!acpi_gbl_permanent_mmap)
396 return __acpi_map_table((unsigned long)phys, size);
397
398 mutex_lock(&acpi_ioremap_lock);
399 /* Check if there's a suitable mapping already. */
400 map = acpi_map_lookup(phys, size);
401 if (map) {
402 map->refcount++;
403 goto out;
404 }
405
406 map = kzalloc(sizeof(*map), GFP_KERNEL);
407 if (!map) {
408 mutex_unlock(&acpi_ioremap_lock);
409 return NULL;
410 }
411
412 pg_off = round_down(phys, PAGE_SIZE);
413 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
414 virt = acpi_map(pg_off, pg_sz);
415 if (!virt) {
416 mutex_unlock(&acpi_ioremap_lock);
417 kfree(map);
418 return NULL;
419 }
420
421 INIT_LIST_HEAD(&map->list);
422 map->virt = virt;
423 map->phys = pg_off;
424 map->size = pg_sz;
425 map->refcount = 1;
426
427 list_add_tail_rcu(&map->list, &acpi_ioremaps);
428
429out:
430 mutex_unlock(&acpi_ioremap_lock);
431 return map->virt + (phys - map->phys);
432}
433EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
434
435void *__init_refok
436acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
437{
438 return (void *)acpi_os_map_iomem(phys, size);
439}
440EXPORT_SYMBOL_GPL(acpi_os_map_memory);
441
442static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
443{
444 if (!--map->refcount)
445 list_del_rcu(&map->list);
446}
447
448static void acpi_os_map_cleanup(struct acpi_ioremap *map)
449{
450 if (!map->refcount) {
451 synchronize_rcu_expedited();
452 acpi_unmap(map->phys, map->virt);
453 kfree(map);
454 }
455}
456
457/**
458 * acpi_os_unmap_iomem - Drop a memory mapping reference.
459 * @virt: Start of the address range to drop a reference to.
460 * @size: Size of the address range to drop a reference to.
461 *
462 * Look up the given virtual address range in the list of existing ACPI memory
463 * mappings, drop a reference to it and unmap it if there are no more active
464 * references to it.
465 *
466 * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
467 * routine simply calls __acpi_unmap_table() to get the job done. Since
468 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
469 * here.
470 */
471void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
472{
473 struct acpi_ioremap *map;
474
475 if (!acpi_gbl_permanent_mmap) {
476 __acpi_unmap_table(virt, size);
477 return;
478 }
479
480 mutex_lock(&acpi_ioremap_lock);
481 map = acpi_map_lookup_virt(virt, size);
482 if (!map) {
483 mutex_unlock(&acpi_ioremap_lock);
484 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
485 return;
486 }
487 acpi_os_drop_map_ref(map);
488 mutex_unlock(&acpi_ioremap_lock);
489
490 acpi_os_map_cleanup(map);
491}
492EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
493
494void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
495{
496 return acpi_os_unmap_iomem((void __iomem *)virt, size);
497}
498EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
499
500void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
501{
502 if (!acpi_gbl_permanent_mmap)
503 __acpi_unmap_table(virt, size);
504}
505
506int acpi_os_map_generic_address(struct acpi_generic_address *gas)
507{
508 u64 addr;
509 void __iomem *virt;
510
511 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
512 return 0;
513
514 /* Handle possible alignment issues */
515 memcpy(&addr, &gas->address, sizeof(addr));
516 if (!addr || !gas->bit_width)
517 return -EINVAL;
518
519 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
520 if (!virt)
521 return -EIO;
522
523 return 0;
524}
525EXPORT_SYMBOL(acpi_os_map_generic_address);
526
527void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
528{
529 u64 addr;
530 struct acpi_ioremap *map;
531
532 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
533 return;
534
535 /* Handle possible alignment issues */
536 memcpy(&addr, &gas->address, sizeof(addr));
537 if (!addr || !gas->bit_width)
538 return;
539
540 mutex_lock(&acpi_ioremap_lock);
541 map = acpi_map_lookup(addr, gas->bit_width / 8);
542 if (!map) {
543 mutex_unlock(&acpi_ioremap_lock);
544 return;
545 }
546 acpi_os_drop_map_ref(map);
547 mutex_unlock(&acpi_ioremap_lock);
548
549 acpi_os_map_cleanup(map);
550}
551EXPORT_SYMBOL(acpi_os_unmap_generic_address);
552
553#ifdef ACPI_FUTURE_USAGE
554acpi_status
555acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
556{
557 if (!phys || !virt)
558 return AE_BAD_PARAMETER;
559
560 *phys = virt_to_phys(virt);
561
562 return AE_OK;
563}
564#endif
565
566#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
567static bool acpi_rev_override;
568
569int __init acpi_rev_override_setup(char *str)
570{
571 acpi_rev_override = true;
572 return 1;
573}
574__setup("acpi_rev_override", acpi_rev_override_setup);
575#else
576#define acpi_rev_override false
577#endif
578
579#define ACPI_MAX_OVERRIDE_LEN 100
580
581static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
582
583acpi_status
584acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
585 char **new_val)
586{
587 if (!init_val || !new_val)
588 return AE_BAD_PARAMETER;
589
590 *new_val = NULL;
591 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
592 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
593 acpi_os_name);
594 *new_val = acpi_os_name;
595 }
596
597 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
598 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
599 *new_val = (char *)5;
600 }
601
602 return AE_OK;
603}
604
605static void acpi_table_taint(struct acpi_table_header *table)
606{
607 pr_warn(PREFIX
608 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
609 table->signature, table->oem_table_id);
610 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
611}
612
613#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
614#include <linux/earlycpio.h>
615#include <linux/memblock.h>
616
617static u64 acpi_tables_addr;
618static int all_tables_size;
619
620/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
621static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
622{
623 u8 sum = 0;
624 u8 *end = buffer + length;
625
626 while (buffer < end)
627 sum = (u8) (sum + *(buffer++));
628 return sum;
629}
630
631/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
632static const char * const table_sigs[] = {
633 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
634 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
635 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
636 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
637 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
638 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
639 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
640 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
641 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
642
643#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
644
645#define ACPI_OVERRIDE_TABLES 64
646static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
647static DECLARE_BITMAP(acpi_initrd_installed, ACPI_OVERRIDE_TABLES);
648
649#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
650
651void __init acpi_initrd_override(void *data, size_t size)
652{
653 int sig, no, table_nr = 0, total_offset = 0;
654 long offset = 0;
655 struct acpi_table_header *table;
656 char cpio_path[32] = "kernel/firmware/acpi/";
657 struct cpio_data file;
658
659 if (data == NULL || size == 0)
660 return;
661
662 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
663 file = find_cpio_data(cpio_path, data, size, &offset);
664 if (!file.data)
665 break;
666
667 data += offset;
668 size -= offset;
669
670 if (file.size < sizeof(struct acpi_table_header)) {
671 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
672 cpio_path, file.name);
673 continue;
674 }
675
676 table = file.data;
677
678 for (sig = 0; table_sigs[sig]; sig++)
679 if (!memcmp(table->signature, table_sigs[sig], 4))
680 break;
681
682 if (!table_sigs[sig]) {
683 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
684 cpio_path, file.name);
685 continue;
686 }
687 if (file.size != table->length) {
688 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
689 cpio_path, file.name);
690 continue;
691 }
692 if (acpi_table_checksum(file.data, table->length)) {
693 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
694 cpio_path, file.name);
695 continue;
696 }
697
698 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
699 table->signature, cpio_path, file.name, table->length);
700
701 all_tables_size += table->length;
702 acpi_initrd_files[table_nr].data = file.data;
703 acpi_initrd_files[table_nr].size = file.size;
704 table_nr++;
705 }
706 if (table_nr == 0)
707 return;
708
709 acpi_tables_addr =
710 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
711 all_tables_size, PAGE_SIZE);
712 if (!acpi_tables_addr) {
713 WARN_ON(1);
714 return;
715 }
716 /*
717 * Only calling e820_add_reserve does not work and the
718 * tables are invalid (memory got used) later.
719 * memblock_reserve works as expected and the tables won't get modified.
720 * But it's not enough on X86 because ioremap will
721 * complain later (used by acpi_os_map_memory) that the pages
722 * that should get mapped are not marked "reserved".
723 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
724 * works fine.
725 */
726 memblock_reserve(acpi_tables_addr, all_tables_size);
727 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
728
729 /*
730 * early_ioremap only can remap 256k one time. If we map all
731 * tables one time, we will hit the limit. Need to map chunks
732 * one by one during copying the same as that in relocate_initrd().
733 */
734 for (no = 0; no < table_nr; no++) {
735 unsigned char *src_p = acpi_initrd_files[no].data;
736 phys_addr_t size = acpi_initrd_files[no].size;
737 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
738 phys_addr_t slop, clen;
739 char *dest_p;
740
741 total_offset += size;
742
743 while (size) {
744 slop = dest_addr & ~PAGE_MASK;
745 clen = size;
746 if (clen > MAP_CHUNK_SIZE - slop)
747 clen = MAP_CHUNK_SIZE - slop;
748 dest_p = early_ioremap(dest_addr & PAGE_MASK,
749 clen + slop);
750 memcpy(dest_p + slop, src_p, clen);
751 early_iounmap(dest_p, clen + slop);
752 src_p += clen;
753 dest_addr += clen;
754 size -= clen;
755 }
756 }
757}
758
759acpi_status
760acpi_os_physical_table_override(struct acpi_table_header *existing_table,
761 acpi_physical_address *address, u32 *length)
762{
763 int table_offset = 0;
764 int table_index = 0;
765 struct acpi_table_header *table;
766 u32 table_length;
767
768 *length = 0;
769 *address = 0;
770 if (!acpi_tables_addr)
771 return AE_OK;
772
773 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
774 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
775 ACPI_HEADER_SIZE);
776 if (table_offset + table->length > all_tables_size) {
777 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
778 WARN_ON(1);
779 return AE_OK;
780 }
781
782 table_length = table->length;
783
784 /* Only override tables matched */
785 if (test_bit(table_index, acpi_initrd_installed) ||
786 memcmp(existing_table->signature, table->signature, 4) ||
787 memcmp(table->oem_table_id, existing_table->oem_table_id,
788 ACPI_OEM_TABLE_ID_SIZE)) {
789 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
790 goto next_table;
791 }
792
793 *length = table_length;
794 *address = acpi_tables_addr + table_offset;
795 acpi_table_taint(existing_table);
796 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
797 set_bit(table_index, acpi_initrd_installed);
798 break;
799
800next_table:
801 table_offset += table_length;
802 table_index++;
803 }
804 return AE_OK;
805}
806
807void __init acpi_initrd_initialize_tables(void)
808{
809 int table_offset = 0;
810 int table_index = 0;
811 u32 table_length;
812 struct acpi_table_header *table;
813
814 if (!acpi_tables_addr)
815 return;
816
817 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
818 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
819 ACPI_HEADER_SIZE);
820 if (table_offset + table->length > all_tables_size) {
821 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
822 WARN_ON(1);
823 return;
824 }
825
826 table_length = table->length;
827
828 /* Skip RSDT/XSDT which should only be used for override */
829 if (test_bit(table_index, acpi_initrd_installed) ||
830 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
831 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
832 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
833 goto next_table;
834 }
835
836 acpi_table_taint(table);
837 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
838 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
839 set_bit(table_index, acpi_initrd_installed);
840next_table:
841 table_offset += table_length;
842 table_index++;
843 }
844}
845#else
846acpi_status
847acpi_os_physical_table_override(struct acpi_table_header *existing_table,
848 acpi_physical_address *address,
849 u32 *table_length)
850{
851 *table_length = 0;
852 *address = 0;
853 return AE_OK;
854}
855
856void __init acpi_initrd_initialize_tables(void)
857{
858}
859#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
860
861acpi_status
862acpi_os_table_override(struct acpi_table_header *existing_table,
863 struct acpi_table_header **new_table)
864{
865 if (!existing_table || !new_table)
866 return AE_BAD_PARAMETER;
867
868 *new_table = NULL;
869
870#ifdef CONFIG_ACPI_CUSTOM_DSDT
871 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
872 *new_table = (struct acpi_table_header *)AmlCode;
873#endif
874 if (*new_table != NULL)
875 acpi_table_taint(existing_table);
876 return AE_OK;
877}
878
879static irqreturn_t acpi_irq(int irq, void *dev_id)
880{
881 u32 handled;
882
883 handled = (*acpi_irq_handler) (acpi_irq_context);
884
885 if (handled) {
886 acpi_irq_handled++;
887 return IRQ_HANDLED;
888 } else {
889 acpi_irq_not_handled++;
890 return IRQ_NONE;
891 }
892}
893
894acpi_status
895acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
896 void *context)
897{
898 unsigned int irq;
899
900 acpi_irq_stats_init();
901
902 /*
903 * ACPI interrupts different from the SCI in our copy of the FADT are
904 * not supported.
905 */
906 if (gsi != acpi_gbl_FADT.sci_interrupt)
907 return AE_BAD_PARAMETER;
908
909 if (acpi_irq_handler)
910 return AE_ALREADY_ACQUIRED;
911
912 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
913 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
914 gsi);
915 return AE_OK;
916 }
917
918 acpi_irq_handler = handler;
919 acpi_irq_context = context;
920 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
921 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
922 acpi_irq_handler = NULL;
923 return AE_NOT_ACQUIRED;
924 }
925 acpi_sci_irq = irq;
926
927 return AE_OK;
928}
929
930acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
931{
932 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
933 return AE_BAD_PARAMETER;
934
935 free_irq(acpi_sci_irq, acpi_irq);
936 acpi_irq_handler = NULL;
937 acpi_sci_irq = INVALID_ACPI_IRQ;
938
939 return AE_OK;
940}
941
942/*
943 * Running in interpreter thread context, safe to sleep
944 */
945
946void acpi_os_sleep(u64 ms)
947{
948 msleep(ms);
949}
950
951void acpi_os_stall(u32 us)
952{
953 while (us) {
954 u32 delay = 1000;
955
956 if (delay > us)
957 delay = us;
958 udelay(delay);
959 touch_nmi_watchdog();
960 us -= delay;
961 }
962}
963
964/*
965 * Support ACPI 3.0 AML Timer operand
966 * Returns 64-bit free-running, monotonically increasing timer
967 * with 100ns granularity
968 */
969u64 acpi_os_get_timer(void)
970{
971 u64 time_ns = ktime_to_ns(ktime_get());
972 do_div(time_ns, 100);
973 return time_ns;
974}
975
976acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
977{
978 u32 dummy;
979
980 if (!value)
981 value = &dummy;
982
983 *value = 0;
984 if (width <= 8) {
985 *(u8 *) value = inb(port);
986 } else if (width <= 16) {
987 *(u16 *) value = inw(port);
988 } else if (width <= 32) {
989 *(u32 *) value = inl(port);
990 } else {
991 BUG();
992 }
993
994 return AE_OK;
995}
996
997EXPORT_SYMBOL(acpi_os_read_port);
998
999acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
1000{
1001 if (width <= 8) {
1002 outb(value, port);
1003 } else if (width <= 16) {
1004 outw(value, port);
1005 } else if (width <= 32) {
1006 outl(value, port);
1007 } else {
1008 BUG();
1009 }
1010
1011 return AE_OK;
1012}
1013
1014EXPORT_SYMBOL(acpi_os_write_port);
1015
1016acpi_status
1017acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
1018{
1019 void __iomem *virt_addr;
1020 unsigned int size = width / 8;
1021 bool unmap = false;
1022 u64 dummy;
1023
1024 rcu_read_lock();
1025 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1026 if (!virt_addr) {
1027 rcu_read_unlock();
1028 virt_addr = acpi_os_ioremap(phys_addr, size);
1029 if (!virt_addr)
1030 return AE_BAD_ADDRESS;
1031 unmap = true;
1032 }
1033
1034 if (!value)
1035 value = &dummy;
1036
1037 switch (width) {
1038 case 8:
1039 *(u8 *) value = readb(virt_addr);
1040 break;
1041 case 16:
1042 *(u16 *) value = readw(virt_addr);
1043 break;
1044 case 32:
1045 *(u32 *) value = readl(virt_addr);
1046 break;
1047 case 64:
1048 *(u64 *) value = readq(virt_addr);
1049 break;
1050 default:
1051 BUG();
1052 }
1053
1054 if (unmap)
1055 iounmap(virt_addr);
1056 else
1057 rcu_read_unlock();
1058
1059 return AE_OK;
1060}
1061
1062acpi_status
1063acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1064{
1065 void __iomem *virt_addr;
1066 unsigned int size = width / 8;
1067 bool unmap = false;
1068
1069 rcu_read_lock();
1070 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1071 if (!virt_addr) {
1072 rcu_read_unlock();
1073 virt_addr = acpi_os_ioremap(phys_addr, size);
1074 if (!virt_addr)
1075 return AE_BAD_ADDRESS;
1076 unmap = true;
1077 }
1078
1079 switch (width) {
1080 case 8:
1081 writeb(value, virt_addr);
1082 break;
1083 case 16:
1084 writew(value, virt_addr);
1085 break;
1086 case 32:
1087 writel(value, virt_addr);
1088 break;
1089 case 64:
1090 writeq(value, virt_addr);
1091 break;
1092 default:
1093 BUG();
1094 }
1095
1096 if (unmap)
1097 iounmap(virt_addr);
1098 else
1099 rcu_read_unlock();
1100
1101 return AE_OK;
1102}
1103
1104acpi_status
1105acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1106 u64 *value, u32 width)
1107{
1108 int result, size;
1109 u32 value32;
1110
1111 if (!value)
1112 return AE_BAD_PARAMETER;
1113
1114 switch (width) {
1115 case 8:
1116 size = 1;
1117 break;
1118 case 16:
1119 size = 2;
1120 break;
1121 case 32:
1122 size = 4;
1123 break;
1124 default:
1125 return AE_ERROR;
1126 }
1127
1128 result = raw_pci_read(pci_id->segment, pci_id->bus,
1129 PCI_DEVFN(pci_id->device, pci_id->function),
1130 reg, size, &value32);
1131 *value = value32;
1132
1133 return (result ? AE_ERROR : AE_OK);
1134}
1135
1136acpi_status
1137acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1138 u64 value, u32 width)
1139{
1140 int result, size;
1141
1142 switch (width) {
1143 case 8:
1144 size = 1;
1145 break;
1146 case 16:
1147 size = 2;
1148 break;
1149 case 32:
1150 size = 4;
1151 break;
1152 default:
1153 return AE_ERROR;
1154 }
1155
1156 result = raw_pci_write(pci_id->segment, pci_id->bus,
1157 PCI_DEVFN(pci_id->device, pci_id->function),
1158 reg, size, value);
1159
1160 return (result ? AE_ERROR : AE_OK);
1161}
1162
1163static void acpi_os_execute_deferred(struct work_struct *work)
1164{
1165 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1166
1167 dpc->function(dpc->context);
1168 kfree(dpc);
1169}
1170
1171#ifdef CONFIG_ACPI_DEBUGGER
1172static struct acpi_debugger acpi_debugger;
1173static bool acpi_debugger_initialized;
1174
1175int acpi_register_debugger(struct module *owner,
1176 const struct acpi_debugger_ops *ops)
1177{
1178 int ret = 0;
1179
1180 mutex_lock(&acpi_debugger.lock);
1181 if (acpi_debugger.ops) {
1182 ret = -EBUSY;
1183 goto err_lock;
1184 }
1185
1186 acpi_debugger.owner = owner;
1187 acpi_debugger.ops = ops;
1188
1189err_lock:
1190 mutex_unlock(&acpi_debugger.lock);
1191 return ret;
1192}
1193EXPORT_SYMBOL(acpi_register_debugger);
1194
1195void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
1196{
1197 mutex_lock(&acpi_debugger.lock);
1198 if (ops == acpi_debugger.ops) {
1199 acpi_debugger.ops = NULL;
1200 acpi_debugger.owner = NULL;
1201 }
1202 mutex_unlock(&acpi_debugger.lock);
1203}
1204EXPORT_SYMBOL(acpi_unregister_debugger);
1205
1206int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
1207{
1208 int ret;
1209 int (*func)(acpi_osd_exec_callback, void *);
1210 struct module *owner;
1211
1212 if (!acpi_debugger_initialized)
1213 return -ENODEV;
1214 mutex_lock(&acpi_debugger.lock);
1215 if (!acpi_debugger.ops) {
1216 ret = -ENODEV;
1217 goto err_lock;
1218 }
1219 if (!try_module_get(acpi_debugger.owner)) {
1220 ret = -ENODEV;
1221 goto err_lock;
1222 }
1223 func = acpi_debugger.ops->create_thread;
1224 owner = acpi_debugger.owner;
1225 mutex_unlock(&acpi_debugger.lock);
1226
1227 ret = func(function, context);
1228
1229 mutex_lock(&acpi_debugger.lock);
1230 module_put(owner);
1231err_lock:
1232 mutex_unlock(&acpi_debugger.lock);
1233 return ret;
1234}
1235
1236ssize_t acpi_debugger_write_log(const char *msg)
1237{
1238 ssize_t ret;
1239 ssize_t (*func)(const char *);
1240 struct module *owner;
1241
1242 if (!acpi_debugger_initialized)
1243 return -ENODEV;
1244 mutex_lock(&acpi_debugger.lock);
1245 if (!acpi_debugger.ops) {
1246 ret = -ENODEV;
1247 goto err_lock;
1248 }
1249 if (!try_module_get(acpi_debugger.owner)) {
1250 ret = -ENODEV;
1251 goto err_lock;
1252 }
1253 func = acpi_debugger.ops->write_log;
1254 owner = acpi_debugger.owner;
1255 mutex_unlock(&acpi_debugger.lock);
1256
1257 ret = func(msg);
1258
1259 mutex_lock(&acpi_debugger.lock);
1260 module_put(owner);
1261err_lock:
1262 mutex_unlock(&acpi_debugger.lock);
1263 return ret;
1264}
1265
1266ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
1267{
1268 ssize_t ret;
1269 ssize_t (*func)(char *, size_t);
1270 struct module *owner;
1271
1272 if (!acpi_debugger_initialized)
1273 return -ENODEV;
1274 mutex_lock(&acpi_debugger.lock);
1275 if (!acpi_debugger.ops) {
1276 ret = -ENODEV;
1277 goto err_lock;
1278 }
1279 if (!try_module_get(acpi_debugger.owner)) {
1280 ret = -ENODEV;
1281 goto err_lock;
1282 }
1283 func = acpi_debugger.ops->read_cmd;
1284 owner = acpi_debugger.owner;
1285 mutex_unlock(&acpi_debugger.lock);
1286
1287 ret = func(buffer, buffer_length);
1288
1289 mutex_lock(&acpi_debugger.lock);
1290 module_put(owner);
1291err_lock:
1292 mutex_unlock(&acpi_debugger.lock);
1293 return ret;
1294}
1295
1296int acpi_debugger_wait_command_ready(void)
1297{
1298 int ret;
1299 int (*func)(bool, char *, size_t);
1300 struct module *owner;
1301
1302 if (!acpi_debugger_initialized)
1303 return -ENODEV;
1304 mutex_lock(&acpi_debugger.lock);
1305 if (!acpi_debugger.ops) {
1306 ret = -ENODEV;
1307 goto err_lock;
1308 }
1309 if (!try_module_get(acpi_debugger.owner)) {
1310 ret = -ENODEV;
1311 goto err_lock;
1312 }
1313 func = acpi_debugger.ops->wait_command_ready;
1314 owner = acpi_debugger.owner;
1315 mutex_unlock(&acpi_debugger.lock);
1316
1317 ret = func(acpi_gbl_method_executing,
1318 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1319
1320 mutex_lock(&acpi_debugger.lock);
1321 module_put(owner);
1322err_lock:
1323 mutex_unlock(&acpi_debugger.lock);
1324 return ret;
1325}
1326
1327int acpi_debugger_notify_command_complete(void)
1328{
1329 int ret;
1330 int (*func)(void);
1331 struct module *owner;
1332
1333 if (!acpi_debugger_initialized)
1334 return -ENODEV;
1335 mutex_lock(&acpi_debugger.lock);
1336 if (!acpi_debugger.ops) {
1337 ret = -ENODEV;
1338 goto err_lock;
1339 }
1340 if (!try_module_get(acpi_debugger.owner)) {
1341 ret = -ENODEV;
1342 goto err_lock;
1343 }
1344 func = acpi_debugger.ops->notify_command_complete;
1345 owner = acpi_debugger.owner;
1346 mutex_unlock(&acpi_debugger.lock);
1347
1348 ret = func();
1349
1350 mutex_lock(&acpi_debugger.lock);
1351 module_put(owner);
1352err_lock:
1353 mutex_unlock(&acpi_debugger.lock);
1354 return ret;
1355}
1356
1357int __init acpi_debugger_init(void)
1358{
1359 mutex_init(&acpi_debugger.lock);
1360 acpi_debugger_initialized = true;
1361 return 0;
1362}
1363#endif
1364
1365/*******************************************************************************
1366 *
1367 * FUNCTION: acpi_os_execute
1368 *
1369 * PARAMETERS: Type - Type of the callback
1370 * Function - Function to be executed
1371 * Context - Function parameters
1372 *
1373 * RETURN: Status
1374 *
1375 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1376 * immediately executes function on a separate thread.
1377 *
1378 ******************************************************************************/
1379
1380acpi_status acpi_os_execute(acpi_execute_type type,
1381 acpi_osd_exec_callback function, void *context)
1382{
1383 acpi_status status = AE_OK;
1384 struct acpi_os_dpc *dpc;
1385 struct workqueue_struct *queue;
1386 int ret;
1387 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1388 "Scheduling function [%p(%p)] for deferred execution.\n",
1389 function, context));
1390
1391 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1392 ret = acpi_debugger_create_thread(function, context);
1393 if (ret) {
1394 pr_err("Call to kthread_create() failed.\n");
1395 status = AE_ERROR;
1396 }
1397 goto out_thread;
1398 }
1399
1400 /*
1401 * Allocate/initialize DPC structure. Note that this memory will be
1402 * freed by the callee. The kernel handles the work_struct list in a
1403 * way that allows us to also free its memory inside the callee.
1404 * Because we may want to schedule several tasks with different
1405 * parameters we can't use the approach some kernel code uses of
1406 * having a static work_struct.
1407 */
1408
1409 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1410 if (!dpc)
1411 return AE_NO_MEMORY;
1412
1413 dpc->function = function;
1414 dpc->context = context;
1415
1416 /*
1417 * To prevent lockdep from complaining unnecessarily, make sure that
1418 * there is a different static lockdep key for each workqueue by using
1419 * INIT_WORK() for each of them separately.
1420 */
1421 if (type == OSL_NOTIFY_HANDLER) {
1422 queue = kacpi_notify_wq;
1423 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1424 } else if (type == OSL_GPE_HANDLER) {
1425 queue = kacpid_wq;
1426 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1427 } else {
1428 pr_err("Unsupported os_execute type %d.\n", type);
1429 status = AE_ERROR;
1430 }
1431
1432 if (ACPI_FAILURE(status))
1433 goto err_workqueue;
1434
1435 /*
1436 * On some machines, a software-initiated SMI causes corruption unless
1437 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1438 * typically it's done in GPE-related methods that are run via
1439 * workqueues, so we can avoid the known corruption cases by always
1440 * queueing on CPU 0.
1441 */
1442 ret = queue_work_on(0, queue, &dpc->work);
1443 if (!ret) {
1444 printk(KERN_ERR PREFIX
1445 "Call to queue_work() failed.\n");
1446 status = AE_ERROR;
1447 }
1448err_workqueue:
1449 if (ACPI_FAILURE(status))
1450 kfree(dpc);
1451out_thread:
1452 return status;
1453}
1454EXPORT_SYMBOL(acpi_os_execute);
1455
1456void acpi_os_wait_events_complete(void)
1457{
1458 /*
1459 * Make sure the GPE handler or the fixed event handler is not used
1460 * on another CPU after removal.
1461 */
1462 if (acpi_sci_irq_valid())
1463 synchronize_hardirq(acpi_sci_irq);
1464 flush_workqueue(kacpid_wq);
1465 flush_workqueue(kacpi_notify_wq);
1466}
1467
1468struct acpi_hp_work {
1469 struct work_struct work;
1470 struct acpi_device *adev;
1471 u32 src;
1472};
1473
1474static void acpi_hotplug_work_fn(struct work_struct *work)
1475{
1476 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1477
1478 acpi_os_wait_events_complete();
1479 acpi_device_hotplug(hpw->adev, hpw->src);
1480 kfree(hpw);
1481}
1482
1483acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1484{
1485 struct acpi_hp_work *hpw;
1486
1487 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1488 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1489 adev, src));
1490
1491 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1492 if (!hpw)
1493 return AE_NO_MEMORY;
1494
1495 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1496 hpw->adev = adev;
1497 hpw->src = src;
1498 /*
1499 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1500 * the hotplug code may call driver .remove() functions, which may
1501 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1502 * these workqueues.
1503 */
1504 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1505 kfree(hpw);
1506 return AE_ERROR;
1507 }
1508 return AE_OK;
1509}
1510
1511bool acpi_queue_hotplug_work(struct work_struct *work)
1512{
1513 return queue_work(kacpi_hotplug_wq, work);
1514}
1515
1516acpi_status
1517acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1518{
1519 struct semaphore *sem = NULL;
1520
1521 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1522 if (!sem)
1523 return AE_NO_MEMORY;
1524
1525 sema_init(sem, initial_units);
1526
1527 *handle = (acpi_handle *) sem;
1528
1529 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1530 *handle, initial_units));
1531
1532 return AE_OK;
1533}
1534
1535/*
1536 * TODO: A better way to delete semaphores? Linux doesn't have a
1537 * 'delete_semaphore()' function -- may result in an invalid
1538 * pointer dereference for non-synchronized consumers. Should
1539 * we at least check for blocked threads and signal/cancel them?
1540 */
1541
1542acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1543{
1544 struct semaphore *sem = (struct semaphore *)handle;
1545
1546 if (!sem)
1547 return AE_BAD_PARAMETER;
1548
1549 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1550
1551 BUG_ON(!list_empty(&sem->wait_list));
1552 kfree(sem);
1553 sem = NULL;
1554
1555 return AE_OK;
1556}
1557
1558/*
1559 * TODO: Support for units > 1?
1560 */
1561acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1562{
1563 acpi_status status = AE_OK;
1564 struct semaphore *sem = (struct semaphore *)handle;
1565 long jiffies;
1566 int ret = 0;
1567
1568 if (!acpi_os_initialized)
1569 return AE_OK;
1570
1571 if (!sem || (units < 1))
1572 return AE_BAD_PARAMETER;
1573
1574 if (units > 1)
1575 return AE_SUPPORT;
1576
1577 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1578 handle, units, timeout));
1579
1580 if (timeout == ACPI_WAIT_FOREVER)
1581 jiffies = MAX_SCHEDULE_TIMEOUT;
1582 else
1583 jiffies = msecs_to_jiffies(timeout);
1584
1585 ret = down_timeout(sem, jiffies);
1586 if (ret)
1587 status = AE_TIME;
1588
1589 if (ACPI_FAILURE(status)) {
1590 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1591 "Failed to acquire semaphore[%p|%d|%d], %s",
1592 handle, units, timeout,
1593 acpi_format_exception(status)));
1594 } else {
1595 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1596 "Acquired semaphore[%p|%d|%d]", handle,
1597 units, timeout));
1598 }
1599
1600 return status;
1601}
1602
1603/*
1604 * TODO: Support for units > 1?
1605 */
1606acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1607{
1608 struct semaphore *sem = (struct semaphore *)handle;
1609
1610 if (!acpi_os_initialized)
1611 return AE_OK;
1612
1613 if (!sem || (units < 1))
1614 return AE_BAD_PARAMETER;
1615
1616 if (units > 1)
1617 return AE_SUPPORT;
1618
1619 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1620 units));
1621
1622 up(sem);
1623
1624 return AE_OK;
1625}
1626
1627acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1628{
1629#ifdef ENABLE_DEBUGGER
1630 if (acpi_in_debugger) {
1631 u32 chars;
1632
1633 kdb_read(buffer, buffer_length);
1634
1635 /* remove the CR kdb includes */
1636 chars = strlen(buffer) - 1;
1637 buffer[chars] = '\0';
1638 }
1639#else
1640 int ret;
1641
1642 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1643 if (ret < 0)
1644 return AE_ERROR;
1645 if (bytes_read)
1646 *bytes_read = ret;
1647#endif
1648
1649 return AE_OK;
1650}
1651EXPORT_SYMBOL(acpi_os_get_line);
1652
1653acpi_status acpi_os_wait_command_ready(void)
1654{
1655 int ret;
1656
1657 ret = acpi_debugger_wait_command_ready();
1658 if (ret < 0)
1659 return AE_ERROR;
1660 return AE_OK;
1661}
1662
1663acpi_status acpi_os_notify_command_complete(void)
1664{
1665 int ret;
1666
1667 ret = acpi_debugger_notify_command_complete();
1668 if (ret < 0)
1669 return AE_ERROR;
1670 return AE_OK;
1671}
1672
1673acpi_status acpi_os_signal(u32 function, void *info)
1674{
1675 switch (function) {
1676 case ACPI_SIGNAL_FATAL:
1677 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1678 break;
1679 case ACPI_SIGNAL_BREAKPOINT:
1680 /*
1681 * AML Breakpoint
1682 * ACPI spec. says to treat it as a NOP unless
1683 * you are debugging. So if/when we integrate
1684 * AML debugger into the kernel debugger its
1685 * hook will go here. But until then it is
1686 * not useful to print anything on breakpoints.
1687 */
1688 break;
1689 default:
1690 break;
1691 }
1692
1693 return AE_OK;
1694}
1695
1696static int __init acpi_os_name_setup(char *str)
1697{
1698 char *p = acpi_os_name;
1699 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1700
1701 if (!str || !*str)
1702 return 0;
1703
1704 for (; count-- && *str; str++) {
1705 if (isalnum(*str) || *str == ' ' || *str == ':')
1706 *p++ = *str;
1707 else if (*str == '\'' || *str == '"')
1708 continue;
1709 else
1710 break;
1711 }
1712 *p = 0;
1713
1714 return 1;
1715
1716}
1717
1718__setup("acpi_os_name=", acpi_os_name_setup);
1719
1720#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1721#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1722
1723struct osi_setup_entry {
1724 char string[OSI_STRING_LENGTH_MAX];
1725 bool enable;
1726};
1727
1728static struct osi_setup_entry
1729 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1730 {"Module Device", true},
1731 {"Processor Device", true},
1732 {"3.0 _SCP Extensions", true},
1733 {"Processor Aggregator Device", true},
1734};
1735
1736void __init acpi_osi_setup(char *str)
1737{
1738 struct osi_setup_entry *osi;
1739 bool enable = true;
1740 int i;
1741
1742 if (!acpi_gbl_create_osi_method)
1743 return;
1744
1745 if (str == NULL || *str == '\0') {
1746 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1747 acpi_gbl_create_osi_method = FALSE;
1748 return;
1749 }
1750
1751 if (*str == '!') {
1752 str++;
1753 if (*str == '\0') {
1754 osi_linux.default_disabling = 1;
1755 return;
1756 } else if (*str == '*') {
1757 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1758 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1759 osi = &osi_setup_entries[i];
1760 osi->enable = false;
1761 }
1762 return;
1763 }
1764 enable = false;
1765 }
1766
1767 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1768 osi = &osi_setup_entries[i];
1769 if (!strcmp(osi->string, str)) {
1770 osi->enable = enable;
1771 break;
1772 } else if (osi->string[0] == '\0') {
1773 osi->enable = enable;
1774 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1775 break;
1776 }
1777 }
1778}
1779
1780static void __init set_osi_linux(unsigned int enable)
1781{
1782 if (osi_linux.enable != enable)
1783 osi_linux.enable = enable;
1784
1785 if (osi_linux.enable)
1786 acpi_osi_setup("Linux");
1787 else
1788 acpi_osi_setup("!Linux");
1789
1790 return;
1791}
1792
1793static void __init acpi_cmdline_osi_linux(unsigned int enable)
1794{
1795 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1796 osi_linux.dmi = 0;
1797 set_osi_linux(enable);
1798
1799 return;
1800}
1801
1802void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1803{
1804 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1805
1806 if (enable == -1)
1807 return;
1808
1809 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1810 set_osi_linux(enable);
1811
1812 return;
1813}
1814
1815/*
1816 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1817 *
1818 * empty string disables _OSI
1819 * string starting with '!' disables that string
1820 * otherwise string is added to list, augmenting built-in strings
1821 */
1822static void __init acpi_osi_setup_late(void)
1823{
1824 struct osi_setup_entry *osi;
1825 char *str;
1826 int i;
1827 acpi_status status;
1828
1829 if (osi_linux.default_disabling) {
1830 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1831
1832 if (ACPI_SUCCESS(status))
1833 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1834 }
1835
1836 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1837 osi = &osi_setup_entries[i];
1838 str = osi->string;
1839
1840 if (*str == '\0')
1841 break;
1842 if (osi->enable) {
1843 status = acpi_install_interface(str);
1844
1845 if (ACPI_SUCCESS(status))
1846 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1847 } else {
1848 status = acpi_remove_interface(str);
1849
1850 if (ACPI_SUCCESS(status))
1851 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1852 }
1853 }
1854}
1855
1856static int __init osi_setup(char *str)
1857{
1858 if (str && !strcmp("Linux", str))
1859 acpi_cmdline_osi_linux(1);
1860 else if (str && !strcmp("!Linux", str))
1861 acpi_cmdline_osi_linux(0);
1862 else
1863 acpi_osi_setup(str);
1864
1865 return 1;
1866}
1867
1868__setup("acpi_osi=", osi_setup);
1869
1870/*
1871 * Disable the auto-serialization of named objects creation methods.
1872 *
1873 * This feature is enabled by default. It marks the AML control methods
1874 * that contain the opcodes to create named objects as "Serialized".
1875 */
1876static int __init acpi_no_auto_serialize_setup(char *str)
1877{
1878 acpi_gbl_auto_serialize_methods = FALSE;
1879 pr_info("ACPI: auto-serialization disabled\n");
1880
1881 return 1;
1882}
1883
1884__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1885
1886/* Check of resource interference between native drivers and ACPI
1887 * OperationRegions (SystemIO and System Memory only).
1888 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1889 * in arbitrary AML code and can interfere with legacy drivers.
1890 * acpi_enforce_resources= can be set to:
1891 *
1892 * - strict (default) (2)
1893 * -> further driver trying to access the resources will not load
1894 * - lax (1)
1895 * -> further driver trying to access the resources will load, but you
1896 * get a system message that something might go wrong...
1897 *
1898 * - no (0)
1899 * -> ACPI Operation Region resources will not be registered
1900 *
1901 */
1902#define ENFORCE_RESOURCES_STRICT 2
1903#define ENFORCE_RESOURCES_LAX 1
1904#define ENFORCE_RESOURCES_NO 0
1905
1906static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1907
1908static int __init acpi_enforce_resources_setup(char *str)
1909{
1910 if (str == NULL || *str == '\0')
1911 return 0;
1912
1913 if (!strcmp("strict", str))
1914 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1915 else if (!strcmp("lax", str))
1916 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1917 else if (!strcmp("no", str))
1918 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1919
1920 return 1;
1921}
1922
1923__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1924
1925/* Check for resource conflicts between ACPI OperationRegions and native
1926 * drivers */
1927int acpi_check_resource_conflict(const struct resource *res)
1928{
1929 acpi_adr_space_type space_id;
1930 acpi_size length;
1931 u8 warn = 0;
1932 int clash = 0;
1933
1934 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1935 return 0;
1936 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1937 return 0;
1938
1939 if (res->flags & IORESOURCE_IO)
1940 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1941 else
1942 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1943
1944 length = resource_size(res);
1945 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1946 warn = 1;
1947 clash = acpi_check_address_range(space_id, res->start, length, warn);
1948
1949 if (clash) {
1950 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1951 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1952 printk(KERN_NOTICE "ACPI: This conflict may"
1953 " cause random problems and system"
1954 " instability\n");
1955 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1956 " for this device, you should use it instead of"
1957 " the native driver\n");
1958 }
1959 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1960 return -EBUSY;
1961 }
1962 return 0;
1963}
1964EXPORT_SYMBOL(acpi_check_resource_conflict);
1965
1966int acpi_check_region(resource_size_t start, resource_size_t n,
1967 const char *name)
1968{
1969 struct resource res = {
1970 .start = start,
1971 .end = start + n - 1,
1972 .name = name,
1973 .flags = IORESOURCE_IO,
1974 };
1975
1976 return acpi_check_resource_conflict(&res);
1977}
1978EXPORT_SYMBOL(acpi_check_region);
1979
1980/*
1981 * Let drivers know whether the resource checks are effective
1982 */
1983int acpi_resources_are_enforced(void)
1984{
1985 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1986}
1987EXPORT_SYMBOL(acpi_resources_are_enforced);
1988
1989bool acpi_osi_is_win8(void)
1990{
1991 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
1992}
1993EXPORT_SYMBOL(acpi_osi_is_win8);
1994
1995/*
1996 * Deallocate the memory for a spinlock.
1997 */
1998void acpi_os_delete_lock(acpi_spinlock handle)
1999{
2000 ACPI_FREE(handle);
2001}
2002
2003/*
2004 * Acquire a spinlock.
2005 *
2006 * handle is a pointer to the spinlock_t.
2007 */
2008
2009acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
2010{
2011 acpi_cpu_flags flags;
2012 spin_lock_irqsave(lockp, flags);
2013 return flags;
2014}
2015
2016/*
2017 * Release a spinlock. See above.
2018 */
2019
2020void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
2021{
2022 spin_unlock_irqrestore(lockp, flags);
2023}
2024
2025#ifndef ACPI_USE_LOCAL_CACHE
2026
2027/*******************************************************************************
2028 *
2029 * FUNCTION: acpi_os_create_cache
2030 *
2031 * PARAMETERS: name - Ascii name for the cache
2032 * size - Size of each cached object
2033 * depth - Maximum depth of the cache (in objects) <ignored>
2034 * cache - Where the new cache object is returned
2035 *
2036 * RETURN: status
2037 *
2038 * DESCRIPTION: Create a cache object
2039 *
2040 ******************************************************************************/
2041
2042acpi_status
2043acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
2044{
2045 *cache = kmem_cache_create(name, size, 0, 0, NULL);
2046 if (*cache == NULL)
2047 return AE_ERROR;
2048 else
2049 return AE_OK;
2050}
2051
2052/*******************************************************************************
2053 *
2054 * FUNCTION: acpi_os_purge_cache
2055 *
2056 * PARAMETERS: Cache - Handle to cache object
2057 *
2058 * RETURN: Status
2059 *
2060 * DESCRIPTION: Free all objects within the requested cache.
2061 *
2062 ******************************************************************************/
2063
2064acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
2065{
2066 kmem_cache_shrink(cache);
2067 return (AE_OK);
2068}
2069
2070/*******************************************************************************
2071 *
2072 * FUNCTION: acpi_os_delete_cache
2073 *
2074 * PARAMETERS: Cache - Handle to cache object
2075 *
2076 * RETURN: Status
2077 *
2078 * DESCRIPTION: Free all objects within the requested cache and delete the
2079 * cache object.
2080 *
2081 ******************************************************************************/
2082
2083acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
2084{
2085 kmem_cache_destroy(cache);
2086 return (AE_OK);
2087}
2088
2089/*******************************************************************************
2090 *
2091 * FUNCTION: acpi_os_release_object
2092 *
2093 * PARAMETERS: Cache - Handle to cache object
2094 * Object - The object to be released
2095 *
2096 * RETURN: None
2097 *
2098 * DESCRIPTION: Release an object to the specified cache. If cache is full,
2099 * the object is deleted.
2100 *
2101 ******************************************************************************/
2102
2103acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
2104{
2105 kmem_cache_free(cache, object);
2106 return (AE_OK);
2107}
2108#endif
2109
2110static int __init acpi_no_static_ssdt_setup(char *s)
2111{
2112 acpi_gbl_disable_ssdt_table_install = TRUE;
2113 pr_info("ACPI: static SSDT installation disabled\n");
2114
2115 return 0;
2116}
2117
2118early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
2119
2120static int __init acpi_disable_return_repair(char *s)
2121{
2122 printk(KERN_NOTICE PREFIX
2123 "ACPI: Predefined validation mechanism disabled\n");
2124 acpi_gbl_disable_auto_repair = TRUE;
2125
2126 return 1;
2127}
2128
2129__setup("acpica_no_return_repair", acpi_disable_return_repair);
2130
2131acpi_status __init acpi_os_initialize(void)
2132{
2133 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
2134 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
2135 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
2136 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
2137 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
2138 /*
2139 * Use acpi_os_map_generic_address to pre-map the reset
2140 * register if it's in system memory.
2141 */
2142 int rv;
2143
2144 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
2145 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
2146 }
2147 acpi_os_initialized = true;
2148
2149 return AE_OK;
2150}
2151
2152acpi_status __init acpi_os_initialize1(void)
2153{
2154 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
2155 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
2156 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
2157 BUG_ON(!kacpid_wq);
2158 BUG_ON(!kacpi_notify_wq);
2159 BUG_ON(!kacpi_hotplug_wq);
2160 acpi_install_interface_handler(acpi_osi_handler);
2161 acpi_osi_setup_late();
2162 return AE_OK;
2163}
2164
2165acpi_status acpi_os_terminate(void)
2166{
2167 if (acpi_irq_handler) {
2168 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
2169 acpi_irq_handler);
2170 }
2171
2172 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
2173 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
2174 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
2175 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
2176 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
2177 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
2178
2179 destroy_workqueue(kacpid_wq);
2180 destroy_workqueue(kacpi_notify_wq);
2181 destroy_workqueue(kacpi_hotplug_wq);
2182
2183 return AE_OK;
2184}
2185
2186acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
2187 u32 pm1b_control)
2188{
2189 int rc = 0;
2190 if (__acpi_os_prepare_sleep)
2191 rc = __acpi_os_prepare_sleep(sleep_state,
2192 pm1a_control, pm1b_control);
2193 if (rc < 0)
2194 return AE_ERROR;
2195 else if (rc > 0)
2196 return AE_CTRL_SKIP;
2197
2198 return AE_OK;
2199}
2200
2201void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
2202 u32 pm1a_ctrl, u32 pm1b_ctrl))
2203{
2204 __acpi_os_prepare_sleep = func;
2205}
2206
2207acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
2208 u32 val_b)
2209{
2210 int rc = 0;
2211 if (__acpi_os_prepare_extended_sleep)
2212 rc = __acpi_os_prepare_extended_sleep(sleep_state,
2213 val_a, val_b);
2214 if (rc < 0)
2215 return AE_ERROR;
2216 else if (rc > 0)
2217 return AE_CTRL_SKIP;
2218
2219 return AE_OK;
2220}
2221
2222void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
2223 u32 val_a, u32 val_b))
2224{
2225 __acpi_os_prepare_extended_sleep = func;
2226}
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/mm.h>
30#include <linux/highmem.h>
31#include <linux/pci.h>
32#include <linux/interrupt.h>
33#include <linux/kmod.h>
34#include <linux/delay.h>
35#include <linux/workqueue.h>
36#include <linux/nmi.h>
37#include <linux/acpi.h>
38#include <linux/efi.h>
39#include <linux/ioport.h>
40#include <linux/list.h>
41#include <linux/jiffies.h>
42#include <linux/semaphore.h>
43
44#include <asm/io.h>
45#include <linux/uaccess.h>
46#include <linux/io-64-nonatomic-lo-hi.h>
47
48#include "internal.h"
49
50#define _COMPONENT ACPI_OS_SERVICES
51ACPI_MODULE_NAME("osl");
52
53struct acpi_os_dpc {
54 acpi_osd_exec_callback function;
55 void *context;
56 struct work_struct work;
57};
58
59#ifdef ENABLE_DEBUGGER
60#include <linux/kdb.h>
61
62/* stuff for debugger support */
63int acpi_in_debugger;
64EXPORT_SYMBOL(acpi_in_debugger);
65#endif /*ENABLE_DEBUGGER */
66
67static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
68 u32 pm1b_ctrl);
69static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
70 u32 val_b);
71
72static acpi_osd_handler acpi_irq_handler;
73static void *acpi_irq_context;
74static struct workqueue_struct *kacpid_wq;
75static struct workqueue_struct *kacpi_notify_wq;
76static struct workqueue_struct *kacpi_hotplug_wq;
77static bool acpi_os_initialized;
78unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
79bool acpi_permanent_mmap = false;
80
81/*
82 * This list of permanent mappings is for memory that may be accessed from
83 * interrupt context, where we can't do the ioremap().
84 */
85struct acpi_ioremap {
86 struct list_head list;
87 void __iomem *virt;
88 acpi_physical_address phys;
89 acpi_size size;
90 unsigned long refcount;
91};
92
93static LIST_HEAD(acpi_ioremaps);
94static DEFINE_MUTEX(acpi_ioremap_lock);
95
96static void __init acpi_request_region (struct acpi_generic_address *gas,
97 unsigned int length, char *desc)
98{
99 u64 addr;
100
101 /* Handle possible alignment issues */
102 memcpy(&addr, &gas->address, sizeof(addr));
103 if (!addr || !length)
104 return;
105
106 /* Resources are never freed */
107 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
108 request_region(addr, length, desc);
109 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
110 request_mem_region(addr, length, desc);
111}
112
113static int __init acpi_reserve_resources(void)
114{
115 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
116 "ACPI PM1a_EVT_BLK");
117
118 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
119 "ACPI PM1b_EVT_BLK");
120
121 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
122 "ACPI PM1a_CNT_BLK");
123
124 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
125 "ACPI PM1b_CNT_BLK");
126
127 if (acpi_gbl_FADT.pm_timer_length == 4)
128 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
129
130 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
131 "ACPI PM2_CNT_BLK");
132
133 /* Length of GPE blocks must be a non-negative multiple of 2 */
134
135 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
136 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
137 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
138
139 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
140 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
141 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
142
143 return 0;
144}
145fs_initcall_sync(acpi_reserve_resources);
146
147void acpi_os_printf(const char *fmt, ...)
148{
149 va_list args;
150 va_start(args, fmt);
151 acpi_os_vprintf(fmt, args);
152 va_end(args);
153}
154EXPORT_SYMBOL(acpi_os_printf);
155
156void acpi_os_vprintf(const char *fmt, va_list args)
157{
158 static char buffer[512];
159
160 vsprintf(buffer, fmt, args);
161
162#ifdef ENABLE_DEBUGGER
163 if (acpi_in_debugger) {
164 kdb_printf("%s", buffer);
165 } else {
166 if (printk_get_level(buffer))
167 printk("%s", buffer);
168 else
169 printk(KERN_CONT "%s", buffer);
170 }
171#else
172 if (acpi_debugger_write_log(buffer) < 0) {
173 if (printk_get_level(buffer))
174 printk("%s", buffer);
175 else
176 printk(KERN_CONT "%s", buffer);
177 }
178#endif
179}
180
181#ifdef CONFIG_KEXEC
182static unsigned long acpi_rsdp;
183static int __init setup_acpi_rsdp(char *arg)
184{
185 return kstrtoul(arg, 16, &acpi_rsdp);
186}
187early_param("acpi_rsdp", setup_acpi_rsdp);
188#endif
189
190acpi_physical_address __init acpi_os_get_root_pointer(void)
191{
192 acpi_physical_address pa = 0;
193
194#ifdef CONFIG_KEXEC
195 if (acpi_rsdp)
196 return acpi_rsdp;
197#endif
198
199 if (efi_enabled(EFI_CONFIG_TABLES)) {
200 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
201 return efi.acpi20;
202 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
203 return efi.acpi;
204 pr_err(PREFIX "System description tables not found\n");
205 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
206 acpi_find_root_pointer(&pa);
207 }
208
209 return pa;
210}
211
212/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
213static struct acpi_ioremap *
214acpi_map_lookup(acpi_physical_address phys, acpi_size size)
215{
216 struct acpi_ioremap *map;
217
218 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
219 if (map->phys <= phys &&
220 phys + size <= map->phys + map->size)
221 return map;
222
223 return NULL;
224}
225
226/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
227static void __iomem *
228acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
229{
230 struct acpi_ioremap *map;
231
232 map = acpi_map_lookup(phys, size);
233 if (map)
234 return map->virt + (phys - map->phys);
235
236 return NULL;
237}
238
239void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
240{
241 struct acpi_ioremap *map;
242 void __iomem *virt = NULL;
243
244 mutex_lock(&acpi_ioremap_lock);
245 map = acpi_map_lookup(phys, size);
246 if (map) {
247 virt = map->virt + (phys - map->phys);
248 map->refcount++;
249 }
250 mutex_unlock(&acpi_ioremap_lock);
251 return virt;
252}
253EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
254
255/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
256static struct acpi_ioremap *
257acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
258{
259 struct acpi_ioremap *map;
260
261 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
262 if (map->virt <= virt &&
263 virt + size <= map->virt + map->size)
264 return map;
265
266 return NULL;
267}
268
269#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
270/* ioremap will take care of cache attributes */
271#define should_use_kmap(pfn) 0
272#else
273#define should_use_kmap(pfn) page_is_ram(pfn)
274#endif
275
276static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
277{
278 unsigned long pfn;
279
280 pfn = pg_off >> PAGE_SHIFT;
281 if (should_use_kmap(pfn)) {
282 if (pg_sz > PAGE_SIZE)
283 return NULL;
284 return (void __iomem __force *)kmap(pfn_to_page(pfn));
285 } else
286 return acpi_os_ioremap(pg_off, pg_sz);
287}
288
289static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
290{
291 unsigned long pfn;
292
293 pfn = pg_off >> PAGE_SHIFT;
294 if (should_use_kmap(pfn))
295 kunmap(pfn_to_page(pfn));
296 else
297 iounmap(vaddr);
298}
299
300/**
301 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
302 * @phys: Start of the physical address range to map.
303 * @size: Size of the physical address range to map.
304 *
305 * Look up the given physical address range in the list of existing ACPI memory
306 * mappings. If found, get a reference to it and return a pointer to it (its
307 * virtual address). If not found, map it, add it to that list and return a
308 * pointer to it.
309 *
310 * During early init (when acpi_permanent_mmap has not been set yet) this
311 * routine simply calls __acpi_map_table() to get the job done.
312 */
313void __iomem *__ref
314acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
315{
316 struct acpi_ioremap *map;
317 void __iomem *virt;
318 acpi_physical_address pg_off;
319 acpi_size pg_sz;
320
321 if (phys > ULONG_MAX) {
322 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
323 return NULL;
324 }
325
326 if (!acpi_permanent_mmap)
327 return __acpi_map_table((unsigned long)phys, size);
328
329 mutex_lock(&acpi_ioremap_lock);
330 /* Check if there's a suitable mapping already. */
331 map = acpi_map_lookup(phys, size);
332 if (map) {
333 map->refcount++;
334 goto out;
335 }
336
337 map = kzalloc(sizeof(*map), GFP_KERNEL);
338 if (!map) {
339 mutex_unlock(&acpi_ioremap_lock);
340 return NULL;
341 }
342
343 pg_off = round_down(phys, PAGE_SIZE);
344 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
345 virt = acpi_map(pg_off, pg_sz);
346 if (!virt) {
347 mutex_unlock(&acpi_ioremap_lock);
348 kfree(map);
349 return NULL;
350 }
351
352 INIT_LIST_HEAD(&map->list);
353 map->virt = virt;
354 map->phys = pg_off;
355 map->size = pg_sz;
356 map->refcount = 1;
357
358 list_add_tail_rcu(&map->list, &acpi_ioremaps);
359
360out:
361 mutex_unlock(&acpi_ioremap_lock);
362 return map->virt + (phys - map->phys);
363}
364EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
365
366void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
367{
368 return (void *)acpi_os_map_iomem(phys, size);
369}
370EXPORT_SYMBOL_GPL(acpi_os_map_memory);
371
372static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
373{
374 if (!--map->refcount)
375 list_del_rcu(&map->list);
376}
377
378static void acpi_os_map_cleanup(struct acpi_ioremap *map)
379{
380 if (!map->refcount) {
381 synchronize_rcu_expedited();
382 acpi_unmap(map->phys, map->virt);
383 kfree(map);
384 }
385}
386
387/**
388 * acpi_os_unmap_iomem - Drop a memory mapping reference.
389 * @virt: Start of the address range to drop a reference to.
390 * @size: Size of the address range to drop a reference to.
391 *
392 * Look up the given virtual address range in the list of existing ACPI memory
393 * mappings, drop a reference to it and unmap it if there are no more active
394 * references to it.
395 *
396 * During early init (when acpi_permanent_mmap has not been set yet) this
397 * routine simply calls __acpi_unmap_table() to get the job done. Since
398 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
399 * here.
400 */
401void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
402{
403 struct acpi_ioremap *map;
404
405 if (!acpi_permanent_mmap) {
406 __acpi_unmap_table(virt, size);
407 return;
408 }
409
410 mutex_lock(&acpi_ioremap_lock);
411 map = acpi_map_lookup_virt(virt, size);
412 if (!map) {
413 mutex_unlock(&acpi_ioremap_lock);
414 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
415 return;
416 }
417 acpi_os_drop_map_ref(map);
418 mutex_unlock(&acpi_ioremap_lock);
419
420 acpi_os_map_cleanup(map);
421}
422EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
423
424void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
425{
426 return acpi_os_unmap_iomem((void __iomem *)virt, size);
427}
428EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
429
430int acpi_os_map_generic_address(struct acpi_generic_address *gas)
431{
432 u64 addr;
433 void __iomem *virt;
434
435 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
436 return 0;
437
438 /* Handle possible alignment issues */
439 memcpy(&addr, &gas->address, sizeof(addr));
440 if (!addr || !gas->bit_width)
441 return -EINVAL;
442
443 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
444 if (!virt)
445 return -EIO;
446
447 return 0;
448}
449EXPORT_SYMBOL(acpi_os_map_generic_address);
450
451void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
452{
453 u64 addr;
454 struct acpi_ioremap *map;
455
456 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
457 return;
458
459 /* Handle possible alignment issues */
460 memcpy(&addr, &gas->address, sizeof(addr));
461 if (!addr || !gas->bit_width)
462 return;
463
464 mutex_lock(&acpi_ioremap_lock);
465 map = acpi_map_lookup(addr, gas->bit_width / 8);
466 if (!map) {
467 mutex_unlock(&acpi_ioremap_lock);
468 return;
469 }
470 acpi_os_drop_map_ref(map);
471 mutex_unlock(&acpi_ioremap_lock);
472
473 acpi_os_map_cleanup(map);
474}
475EXPORT_SYMBOL(acpi_os_unmap_generic_address);
476
477#ifdef ACPI_FUTURE_USAGE
478acpi_status
479acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
480{
481 if (!phys || !virt)
482 return AE_BAD_PARAMETER;
483
484 *phys = virt_to_phys(virt);
485
486 return AE_OK;
487}
488#endif
489
490#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
491static bool acpi_rev_override;
492
493int __init acpi_rev_override_setup(char *str)
494{
495 acpi_rev_override = true;
496 return 1;
497}
498__setup("acpi_rev_override", acpi_rev_override_setup);
499#else
500#define acpi_rev_override false
501#endif
502
503#define ACPI_MAX_OVERRIDE_LEN 100
504
505static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
506
507acpi_status
508acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
509 acpi_string *new_val)
510{
511 if (!init_val || !new_val)
512 return AE_BAD_PARAMETER;
513
514 *new_val = NULL;
515 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
516 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
517 acpi_os_name);
518 *new_val = acpi_os_name;
519 }
520
521 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
522 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
523 *new_val = (char *)5;
524 }
525
526 return AE_OK;
527}
528
529static irqreturn_t acpi_irq(int irq, void *dev_id)
530{
531 u32 handled;
532
533 handled = (*acpi_irq_handler) (acpi_irq_context);
534
535 if (handled) {
536 acpi_irq_handled++;
537 return IRQ_HANDLED;
538 } else {
539 acpi_irq_not_handled++;
540 return IRQ_NONE;
541 }
542}
543
544acpi_status
545acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
546 void *context)
547{
548 unsigned int irq;
549
550 acpi_irq_stats_init();
551
552 /*
553 * ACPI interrupts different from the SCI in our copy of the FADT are
554 * not supported.
555 */
556 if (gsi != acpi_gbl_FADT.sci_interrupt)
557 return AE_BAD_PARAMETER;
558
559 if (acpi_irq_handler)
560 return AE_ALREADY_ACQUIRED;
561
562 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
563 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
564 gsi);
565 return AE_OK;
566 }
567
568 acpi_irq_handler = handler;
569 acpi_irq_context = context;
570 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
571 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
572 acpi_irq_handler = NULL;
573 return AE_NOT_ACQUIRED;
574 }
575 acpi_sci_irq = irq;
576
577 return AE_OK;
578}
579
580acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
581{
582 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
583 return AE_BAD_PARAMETER;
584
585 free_irq(acpi_sci_irq, acpi_irq);
586 acpi_irq_handler = NULL;
587 acpi_sci_irq = INVALID_ACPI_IRQ;
588
589 return AE_OK;
590}
591
592/*
593 * Running in interpreter thread context, safe to sleep
594 */
595
596void acpi_os_sleep(u64 ms)
597{
598 msleep(ms);
599}
600
601void acpi_os_stall(u32 us)
602{
603 while (us) {
604 u32 delay = 1000;
605
606 if (delay > us)
607 delay = us;
608 udelay(delay);
609 touch_nmi_watchdog();
610 us -= delay;
611 }
612}
613
614/*
615 * Support ACPI 3.0 AML Timer operand
616 * Returns 64-bit free-running, monotonically increasing timer
617 * with 100ns granularity
618 */
619u64 acpi_os_get_timer(void)
620{
621 u64 time_ns = ktime_to_ns(ktime_get());
622 do_div(time_ns, 100);
623 return time_ns;
624}
625
626acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
627{
628 u32 dummy;
629
630 if (!value)
631 value = &dummy;
632
633 *value = 0;
634 if (width <= 8) {
635 *(u8 *) value = inb(port);
636 } else if (width <= 16) {
637 *(u16 *) value = inw(port);
638 } else if (width <= 32) {
639 *(u32 *) value = inl(port);
640 } else {
641 BUG();
642 }
643
644 return AE_OK;
645}
646
647EXPORT_SYMBOL(acpi_os_read_port);
648
649acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
650{
651 if (width <= 8) {
652 outb(value, port);
653 } else if (width <= 16) {
654 outw(value, port);
655 } else if (width <= 32) {
656 outl(value, port);
657 } else {
658 BUG();
659 }
660
661 return AE_OK;
662}
663
664EXPORT_SYMBOL(acpi_os_write_port);
665
666acpi_status
667acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
668{
669 void __iomem *virt_addr;
670 unsigned int size = width / 8;
671 bool unmap = false;
672 u64 dummy;
673
674 rcu_read_lock();
675 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
676 if (!virt_addr) {
677 rcu_read_unlock();
678 virt_addr = acpi_os_ioremap(phys_addr, size);
679 if (!virt_addr)
680 return AE_BAD_ADDRESS;
681 unmap = true;
682 }
683
684 if (!value)
685 value = &dummy;
686
687 switch (width) {
688 case 8:
689 *(u8 *) value = readb(virt_addr);
690 break;
691 case 16:
692 *(u16 *) value = readw(virt_addr);
693 break;
694 case 32:
695 *(u32 *) value = readl(virt_addr);
696 break;
697 case 64:
698 *(u64 *) value = readq(virt_addr);
699 break;
700 default:
701 BUG();
702 }
703
704 if (unmap)
705 iounmap(virt_addr);
706 else
707 rcu_read_unlock();
708
709 return AE_OK;
710}
711
712acpi_status
713acpi_os_write_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
719 rcu_read_lock();
720 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
721 if (!virt_addr) {
722 rcu_read_unlock();
723 virt_addr = acpi_os_ioremap(phys_addr, size);
724 if (!virt_addr)
725 return AE_BAD_ADDRESS;
726 unmap = true;
727 }
728
729 switch (width) {
730 case 8:
731 writeb(value, virt_addr);
732 break;
733 case 16:
734 writew(value, virt_addr);
735 break;
736 case 32:
737 writel(value, virt_addr);
738 break;
739 case 64:
740 writeq(value, virt_addr);
741 break;
742 default:
743 BUG();
744 }
745
746 if (unmap)
747 iounmap(virt_addr);
748 else
749 rcu_read_unlock();
750
751 return AE_OK;
752}
753
754acpi_status
755acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
756 u64 *value, u32 width)
757{
758 int result, size;
759 u32 value32;
760
761 if (!value)
762 return AE_BAD_PARAMETER;
763
764 switch (width) {
765 case 8:
766 size = 1;
767 break;
768 case 16:
769 size = 2;
770 break;
771 case 32:
772 size = 4;
773 break;
774 default:
775 return AE_ERROR;
776 }
777
778 result = raw_pci_read(pci_id->segment, pci_id->bus,
779 PCI_DEVFN(pci_id->device, pci_id->function),
780 reg, size, &value32);
781 *value = value32;
782
783 return (result ? AE_ERROR : AE_OK);
784}
785
786acpi_status
787acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
788 u64 value, u32 width)
789{
790 int result, size;
791
792 switch (width) {
793 case 8:
794 size = 1;
795 break;
796 case 16:
797 size = 2;
798 break;
799 case 32:
800 size = 4;
801 break;
802 default:
803 return AE_ERROR;
804 }
805
806 result = raw_pci_write(pci_id->segment, pci_id->bus,
807 PCI_DEVFN(pci_id->device, pci_id->function),
808 reg, size, value);
809
810 return (result ? AE_ERROR : AE_OK);
811}
812
813static void acpi_os_execute_deferred(struct work_struct *work)
814{
815 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
816
817 dpc->function(dpc->context);
818 kfree(dpc);
819}
820
821#ifdef CONFIG_ACPI_DEBUGGER
822static struct acpi_debugger acpi_debugger;
823static bool acpi_debugger_initialized;
824
825int acpi_register_debugger(struct module *owner,
826 const struct acpi_debugger_ops *ops)
827{
828 int ret = 0;
829
830 mutex_lock(&acpi_debugger.lock);
831 if (acpi_debugger.ops) {
832 ret = -EBUSY;
833 goto err_lock;
834 }
835
836 acpi_debugger.owner = owner;
837 acpi_debugger.ops = ops;
838
839err_lock:
840 mutex_unlock(&acpi_debugger.lock);
841 return ret;
842}
843EXPORT_SYMBOL(acpi_register_debugger);
844
845void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
846{
847 mutex_lock(&acpi_debugger.lock);
848 if (ops == acpi_debugger.ops) {
849 acpi_debugger.ops = NULL;
850 acpi_debugger.owner = NULL;
851 }
852 mutex_unlock(&acpi_debugger.lock);
853}
854EXPORT_SYMBOL(acpi_unregister_debugger);
855
856int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
857{
858 int ret;
859 int (*func)(acpi_osd_exec_callback, void *);
860 struct module *owner;
861
862 if (!acpi_debugger_initialized)
863 return -ENODEV;
864 mutex_lock(&acpi_debugger.lock);
865 if (!acpi_debugger.ops) {
866 ret = -ENODEV;
867 goto err_lock;
868 }
869 if (!try_module_get(acpi_debugger.owner)) {
870 ret = -ENODEV;
871 goto err_lock;
872 }
873 func = acpi_debugger.ops->create_thread;
874 owner = acpi_debugger.owner;
875 mutex_unlock(&acpi_debugger.lock);
876
877 ret = func(function, context);
878
879 mutex_lock(&acpi_debugger.lock);
880 module_put(owner);
881err_lock:
882 mutex_unlock(&acpi_debugger.lock);
883 return ret;
884}
885
886ssize_t acpi_debugger_write_log(const char *msg)
887{
888 ssize_t ret;
889 ssize_t (*func)(const char *);
890 struct module *owner;
891
892 if (!acpi_debugger_initialized)
893 return -ENODEV;
894 mutex_lock(&acpi_debugger.lock);
895 if (!acpi_debugger.ops) {
896 ret = -ENODEV;
897 goto err_lock;
898 }
899 if (!try_module_get(acpi_debugger.owner)) {
900 ret = -ENODEV;
901 goto err_lock;
902 }
903 func = acpi_debugger.ops->write_log;
904 owner = acpi_debugger.owner;
905 mutex_unlock(&acpi_debugger.lock);
906
907 ret = func(msg);
908
909 mutex_lock(&acpi_debugger.lock);
910 module_put(owner);
911err_lock:
912 mutex_unlock(&acpi_debugger.lock);
913 return ret;
914}
915
916ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
917{
918 ssize_t ret;
919 ssize_t (*func)(char *, size_t);
920 struct module *owner;
921
922 if (!acpi_debugger_initialized)
923 return -ENODEV;
924 mutex_lock(&acpi_debugger.lock);
925 if (!acpi_debugger.ops) {
926 ret = -ENODEV;
927 goto err_lock;
928 }
929 if (!try_module_get(acpi_debugger.owner)) {
930 ret = -ENODEV;
931 goto err_lock;
932 }
933 func = acpi_debugger.ops->read_cmd;
934 owner = acpi_debugger.owner;
935 mutex_unlock(&acpi_debugger.lock);
936
937 ret = func(buffer, buffer_length);
938
939 mutex_lock(&acpi_debugger.lock);
940 module_put(owner);
941err_lock:
942 mutex_unlock(&acpi_debugger.lock);
943 return ret;
944}
945
946int acpi_debugger_wait_command_ready(void)
947{
948 int ret;
949 int (*func)(bool, char *, size_t);
950 struct module *owner;
951
952 if (!acpi_debugger_initialized)
953 return -ENODEV;
954 mutex_lock(&acpi_debugger.lock);
955 if (!acpi_debugger.ops) {
956 ret = -ENODEV;
957 goto err_lock;
958 }
959 if (!try_module_get(acpi_debugger.owner)) {
960 ret = -ENODEV;
961 goto err_lock;
962 }
963 func = acpi_debugger.ops->wait_command_ready;
964 owner = acpi_debugger.owner;
965 mutex_unlock(&acpi_debugger.lock);
966
967 ret = func(acpi_gbl_method_executing,
968 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
969
970 mutex_lock(&acpi_debugger.lock);
971 module_put(owner);
972err_lock:
973 mutex_unlock(&acpi_debugger.lock);
974 return ret;
975}
976
977int acpi_debugger_notify_command_complete(void)
978{
979 int ret;
980 int (*func)(void);
981 struct module *owner;
982
983 if (!acpi_debugger_initialized)
984 return -ENODEV;
985 mutex_lock(&acpi_debugger.lock);
986 if (!acpi_debugger.ops) {
987 ret = -ENODEV;
988 goto err_lock;
989 }
990 if (!try_module_get(acpi_debugger.owner)) {
991 ret = -ENODEV;
992 goto err_lock;
993 }
994 func = acpi_debugger.ops->notify_command_complete;
995 owner = acpi_debugger.owner;
996 mutex_unlock(&acpi_debugger.lock);
997
998 ret = func();
999
1000 mutex_lock(&acpi_debugger.lock);
1001 module_put(owner);
1002err_lock:
1003 mutex_unlock(&acpi_debugger.lock);
1004 return ret;
1005}
1006
1007int __init acpi_debugger_init(void)
1008{
1009 mutex_init(&acpi_debugger.lock);
1010 acpi_debugger_initialized = true;
1011 return 0;
1012}
1013#endif
1014
1015/*******************************************************************************
1016 *
1017 * FUNCTION: acpi_os_execute
1018 *
1019 * PARAMETERS: Type - Type of the callback
1020 * Function - Function to be executed
1021 * Context - Function parameters
1022 *
1023 * RETURN: Status
1024 *
1025 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1026 * immediately executes function on a separate thread.
1027 *
1028 ******************************************************************************/
1029
1030acpi_status acpi_os_execute(acpi_execute_type type,
1031 acpi_osd_exec_callback function, void *context)
1032{
1033 acpi_status status = AE_OK;
1034 struct acpi_os_dpc *dpc;
1035 struct workqueue_struct *queue;
1036 int ret;
1037 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1038 "Scheduling function [%p(%p)] for deferred execution.\n",
1039 function, context));
1040
1041 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1042 ret = acpi_debugger_create_thread(function, context);
1043 if (ret) {
1044 pr_err("Call to kthread_create() failed.\n");
1045 status = AE_ERROR;
1046 }
1047 goto out_thread;
1048 }
1049
1050 /*
1051 * Allocate/initialize DPC structure. Note that this memory will be
1052 * freed by the callee. The kernel handles the work_struct list in a
1053 * way that allows us to also free its memory inside the callee.
1054 * Because we may want to schedule several tasks with different
1055 * parameters we can't use the approach some kernel code uses of
1056 * having a static work_struct.
1057 */
1058
1059 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1060 if (!dpc)
1061 return AE_NO_MEMORY;
1062
1063 dpc->function = function;
1064 dpc->context = context;
1065
1066 /*
1067 * To prevent lockdep from complaining unnecessarily, make sure that
1068 * there is a different static lockdep key for each workqueue by using
1069 * INIT_WORK() for each of them separately.
1070 */
1071 if (type == OSL_NOTIFY_HANDLER) {
1072 queue = kacpi_notify_wq;
1073 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1074 } else if (type == OSL_GPE_HANDLER) {
1075 queue = kacpid_wq;
1076 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1077 } else {
1078 pr_err("Unsupported os_execute type %d.\n", type);
1079 status = AE_ERROR;
1080 }
1081
1082 if (ACPI_FAILURE(status))
1083 goto err_workqueue;
1084
1085 /*
1086 * On some machines, a software-initiated SMI causes corruption unless
1087 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1088 * typically it's done in GPE-related methods that are run via
1089 * workqueues, so we can avoid the known corruption cases by always
1090 * queueing on CPU 0.
1091 */
1092 ret = queue_work_on(0, queue, &dpc->work);
1093 if (!ret) {
1094 printk(KERN_ERR PREFIX
1095 "Call to queue_work() failed.\n");
1096 status = AE_ERROR;
1097 }
1098err_workqueue:
1099 if (ACPI_FAILURE(status))
1100 kfree(dpc);
1101out_thread:
1102 return status;
1103}
1104EXPORT_SYMBOL(acpi_os_execute);
1105
1106void acpi_os_wait_events_complete(void)
1107{
1108 /*
1109 * Make sure the GPE handler or the fixed event handler is not used
1110 * on another CPU after removal.
1111 */
1112 if (acpi_sci_irq_valid())
1113 synchronize_hardirq(acpi_sci_irq);
1114 flush_workqueue(kacpid_wq);
1115 flush_workqueue(kacpi_notify_wq);
1116}
1117
1118struct acpi_hp_work {
1119 struct work_struct work;
1120 struct acpi_device *adev;
1121 u32 src;
1122};
1123
1124static void acpi_hotplug_work_fn(struct work_struct *work)
1125{
1126 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1127
1128 acpi_os_wait_events_complete();
1129 acpi_device_hotplug(hpw->adev, hpw->src);
1130 kfree(hpw);
1131}
1132
1133acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1134{
1135 struct acpi_hp_work *hpw;
1136
1137 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1138 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1139 adev, src));
1140
1141 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1142 if (!hpw)
1143 return AE_NO_MEMORY;
1144
1145 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1146 hpw->adev = adev;
1147 hpw->src = src;
1148 /*
1149 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1150 * the hotplug code may call driver .remove() functions, which may
1151 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1152 * these workqueues.
1153 */
1154 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1155 kfree(hpw);
1156 return AE_ERROR;
1157 }
1158 return AE_OK;
1159}
1160
1161bool acpi_queue_hotplug_work(struct work_struct *work)
1162{
1163 return queue_work(kacpi_hotplug_wq, work);
1164}
1165
1166acpi_status
1167acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1168{
1169 struct semaphore *sem = NULL;
1170
1171 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1172 if (!sem)
1173 return AE_NO_MEMORY;
1174
1175 sema_init(sem, initial_units);
1176
1177 *handle = (acpi_handle *) sem;
1178
1179 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1180 *handle, initial_units));
1181
1182 return AE_OK;
1183}
1184
1185/*
1186 * TODO: A better way to delete semaphores? Linux doesn't have a
1187 * 'delete_semaphore()' function -- may result in an invalid
1188 * pointer dereference for non-synchronized consumers. Should
1189 * we at least check for blocked threads and signal/cancel them?
1190 */
1191
1192acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1193{
1194 struct semaphore *sem = (struct semaphore *)handle;
1195
1196 if (!sem)
1197 return AE_BAD_PARAMETER;
1198
1199 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1200
1201 BUG_ON(!list_empty(&sem->wait_list));
1202 kfree(sem);
1203 sem = NULL;
1204
1205 return AE_OK;
1206}
1207
1208/*
1209 * TODO: Support for units > 1?
1210 */
1211acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1212{
1213 acpi_status status = AE_OK;
1214 struct semaphore *sem = (struct semaphore *)handle;
1215 long jiffies;
1216 int ret = 0;
1217
1218 if (!acpi_os_initialized)
1219 return AE_OK;
1220
1221 if (!sem || (units < 1))
1222 return AE_BAD_PARAMETER;
1223
1224 if (units > 1)
1225 return AE_SUPPORT;
1226
1227 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1228 handle, units, timeout));
1229
1230 if (timeout == ACPI_WAIT_FOREVER)
1231 jiffies = MAX_SCHEDULE_TIMEOUT;
1232 else
1233 jiffies = msecs_to_jiffies(timeout);
1234
1235 ret = down_timeout(sem, jiffies);
1236 if (ret)
1237 status = AE_TIME;
1238
1239 if (ACPI_FAILURE(status)) {
1240 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1241 "Failed to acquire semaphore[%p|%d|%d], %s",
1242 handle, units, timeout,
1243 acpi_format_exception(status)));
1244 } else {
1245 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1246 "Acquired semaphore[%p|%d|%d]", handle,
1247 units, timeout));
1248 }
1249
1250 return status;
1251}
1252
1253/*
1254 * TODO: Support for units > 1?
1255 */
1256acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1257{
1258 struct semaphore *sem = (struct semaphore *)handle;
1259
1260 if (!acpi_os_initialized)
1261 return AE_OK;
1262
1263 if (!sem || (units < 1))
1264 return AE_BAD_PARAMETER;
1265
1266 if (units > 1)
1267 return AE_SUPPORT;
1268
1269 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1270 units));
1271
1272 up(sem);
1273
1274 return AE_OK;
1275}
1276
1277acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1278{
1279#ifdef ENABLE_DEBUGGER
1280 if (acpi_in_debugger) {
1281 u32 chars;
1282
1283 kdb_read(buffer, buffer_length);
1284
1285 /* remove the CR kdb includes */
1286 chars = strlen(buffer) - 1;
1287 buffer[chars] = '\0';
1288 }
1289#else
1290 int ret;
1291
1292 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1293 if (ret < 0)
1294 return AE_ERROR;
1295 if (bytes_read)
1296 *bytes_read = ret;
1297#endif
1298
1299 return AE_OK;
1300}
1301EXPORT_SYMBOL(acpi_os_get_line);
1302
1303acpi_status acpi_os_wait_command_ready(void)
1304{
1305 int ret;
1306
1307 ret = acpi_debugger_wait_command_ready();
1308 if (ret < 0)
1309 return AE_ERROR;
1310 return AE_OK;
1311}
1312
1313acpi_status acpi_os_notify_command_complete(void)
1314{
1315 int ret;
1316
1317 ret = acpi_debugger_notify_command_complete();
1318 if (ret < 0)
1319 return AE_ERROR;
1320 return AE_OK;
1321}
1322
1323acpi_status acpi_os_signal(u32 function, void *info)
1324{
1325 switch (function) {
1326 case ACPI_SIGNAL_FATAL:
1327 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1328 break;
1329 case ACPI_SIGNAL_BREAKPOINT:
1330 /*
1331 * AML Breakpoint
1332 * ACPI spec. says to treat it as a NOP unless
1333 * you are debugging. So if/when we integrate
1334 * AML debugger into the kernel debugger its
1335 * hook will go here. But until then it is
1336 * not useful to print anything on breakpoints.
1337 */
1338 break;
1339 default:
1340 break;
1341 }
1342
1343 return AE_OK;
1344}
1345
1346static int __init acpi_os_name_setup(char *str)
1347{
1348 char *p = acpi_os_name;
1349 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1350
1351 if (!str || !*str)
1352 return 0;
1353
1354 for (; count-- && *str; str++) {
1355 if (isalnum(*str) || *str == ' ' || *str == ':')
1356 *p++ = *str;
1357 else if (*str == '\'' || *str == '"')
1358 continue;
1359 else
1360 break;
1361 }
1362 *p = 0;
1363
1364 return 1;
1365
1366}
1367
1368__setup("acpi_os_name=", acpi_os_name_setup);
1369
1370/*
1371 * Disable the auto-serialization of named objects creation methods.
1372 *
1373 * This feature is enabled by default. It marks the AML control methods
1374 * that contain the opcodes to create named objects as "Serialized".
1375 */
1376static int __init acpi_no_auto_serialize_setup(char *str)
1377{
1378 acpi_gbl_auto_serialize_methods = FALSE;
1379 pr_info("ACPI: auto-serialization disabled\n");
1380
1381 return 1;
1382}
1383
1384__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1385
1386/* Check of resource interference between native drivers and ACPI
1387 * OperationRegions (SystemIO and System Memory only).
1388 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1389 * in arbitrary AML code and can interfere with legacy drivers.
1390 * acpi_enforce_resources= can be set to:
1391 *
1392 * - strict (default) (2)
1393 * -> further driver trying to access the resources will not load
1394 * - lax (1)
1395 * -> further driver trying to access the resources will load, but you
1396 * get a system message that something might go wrong...
1397 *
1398 * - no (0)
1399 * -> ACPI Operation Region resources will not be registered
1400 *
1401 */
1402#define ENFORCE_RESOURCES_STRICT 2
1403#define ENFORCE_RESOURCES_LAX 1
1404#define ENFORCE_RESOURCES_NO 0
1405
1406static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1407
1408static int __init acpi_enforce_resources_setup(char *str)
1409{
1410 if (str == NULL || *str == '\0')
1411 return 0;
1412
1413 if (!strcmp("strict", str))
1414 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1415 else if (!strcmp("lax", str))
1416 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1417 else if (!strcmp("no", str))
1418 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1419
1420 return 1;
1421}
1422
1423__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1424
1425/* Check for resource conflicts between ACPI OperationRegions and native
1426 * drivers */
1427int acpi_check_resource_conflict(const struct resource *res)
1428{
1429 acpi_adr_space_type space_id;
1430 acpi_size length;
1431 u8 warn = 0;
1432 int clash = 0;
1433
1434 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1435 return 0;
1436 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1437 return 0;
1438
1439 if (res->flags & IORESOURCE_IO)
1440 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1441 else
1442 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1443
1444 length = resource_size(res);
1445 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1446 warn = 1;
1447 clash = acpi_check_address_range(space_id, res->start, length, warn);
1448
1449 if (clash) {
1450 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1451 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1452 printk(KERN_NOTICE "ACPI: This conflict may"
1453 " cause random problems and system"
1454 " instability\n");
1455 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1456 " for this device, you should use it instead of"
1457 " the native driver\n");
1458 }
1459 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1460 return -EBUSY;
1461 }
1462 return 0;
1463}
1464EXPORT_SYMBOL(acpi_check_resource_conflict);
1465
1466int acpi_check_region(resource_size_t start, resource_size_t n,
1467 const char *name)
1468{
1469 struct resource res = {
1470 .start = start,
1471 .end = start + n - 1,
1472 .name = name,
1473 .flags = IORESOURCE_IO,
1474 };
1475
1476 return acpi_check_resource_conflict(&res);
1477}
1478EXPORT_SYMBOL(acpi_check_region);
1479
1480/*
1481 * Let drivers know whether the resource checks are effective
1482 */
1483int acpi_resources_are_enforced(void)
1484{
1485 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1486}
1487EXPORT_SYMBOL(acpi_resources_are_enforced);
1488
1489/*
1490 * Deallocate the memory for a spinlock.
1491 */
1492void acpi_os_delete_lock(acpi_spinlock handle)
1493{
1494 ACPI_FREE(handle);
1495}
1496
1497/*
1498 * Acquire a spinlock.
1499 *
1500 * handle is a pointer to the spinlock_t.
1501 */
1502
1503acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1504{
1505 acpi_cpu_flags flags;
1506 spin_lock_irqsave(lockp, flags);
1507 return flags;
1508}
1509
1510/*
1511 * Release a spinlock. See above.
1512 */
1513
1514void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1515{
1516 spin_unlock_irqrestore(lockp, flags);
1517}
1518
1519#ifndef ACPI_USE_LOCAL_CACHE
1520
1521/*******************************************************************************
1522 *
1523 * FUNCTION: acpi_os_create_cache
1524 *
1525 * PARAMETERS: name - Ascii name for the cache
1526 * size - Size of each cached object
1527 * depth - Maximum depth of the cache (in objects) <ignored>
1528 * cache - Where the new cache object is returned
1529 *
1530 * RETURN: status
1531 *
1532 * DESCRIPTION: Create a cache object
1533 *
1534 ******************************************************************************/
1535
1536acpi_status
1537acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1538{
1539 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1540 if (*cache == NULL)
1541 return AE_ERROR;
1542 else
1543 return AE_OK;
1544}
1545
1546/*******************************************************************************
1547 *
1548 * FUNCTION: acpi_os_purge_cache
1549 *
1550 * PARAMETERS: Cache - Handle to cache object
1551 *
1552 * RETURN: Status
1553 *
1554 * DESCRIPTION: Free all objects within the requested cache.
1555 *
1556 ******************************************************************************/
1557
1558acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1559{
1560 kmem_cache_shrink(cache);
1561 return (AE_OK);
1562}
1563
1564/*******************************************************************************
1565 *
1566 * FUNCTION: acpi_os_delete_cache
1567 *
1568 * PARAMETERS: Cache - Handle to cache object
1569 *
1570 * RETURN: Status
1571 *
1572 * DESCRIPTION: Free all objects within the requested cache and delete the
1573 * cache object.
1574 *
1575 ******************************************************************************/
1576
1577acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1578{
1579 kmem_cache_destroy(cache);
1580 return (AE_OK);
1581}
1582
1583/*******************************************************************************
1584 *
1585 * FUNCTION: acpi_os_release_object
1586 *
1587 * PARAMETERS: Cache - Handle to cache object
1588 * Object - The object to be released
1589 *
1590 * RETURN: None
1591 *
1592 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1593 * the object is deleted.
1594 *
1595 ******************************************************************************/
1596
1597acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1598{
1599 kmem_cache_free(cache, object);
1600 return (AE_OK);
1601}
1602#endif
1603
1604static int __init acpi_no_static_ssdt_setup(char *s)
1605{
1606 acpi_gbl_disable_ssdt_table_install = TRUE;
1607 pr_info("ACPI: static SSDT installation disabled\n");
1608
1609 return 0;
1610}
1611
1612early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1613
1614static int __init acpi_disable_return_repair(char *s)
1615{
1616 printk(KERN_NOTICE PREFIX
1617 "ACPI: Predefined validation mechanism disabled\n");
1618 acpi_gbl_disable_auto_repair = TRUE;
1619
1620 return 1;
1621}
1622
1623__setup("acpica_no_return_repair", acpi_disable_return_repair);
1624
1625acpi_status __init acpi_os_initialize(void)
1626{
1627 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1628 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1629 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1630 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1631 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1632 /*
1633 * Use acpi_os_map_generic_address to pre-map the reset
1634 * register if it's in system memory.
1635 */
1636 int rv;
1637
1638 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1639 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1640 }
1641 acpi_os_initialized = true;
1642
1643 return AE_OK;
1644}
1645
1646acpi_status __init acpi_os_initialize1(void)
1647{
1648 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1649 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1650 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1651 BUG_ON(!kacpid_wq);
1652 BUG_ON(!kacpi_notify_wq);
1653 BUG_ON(!kacpi_hotplug_wq);
1654 acpi_osi_init();
1655 return AE_OK;
1656}
1657
1658acpi_status acpi_os_terminate(void)
1659{
1660 if (acpi_irq_handler) {
1661 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1662 acpi_irq_handler);
1663 }
1664
1665 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1666 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1667 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1668 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1669 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1670 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1671
1672 destroy_workqueue(kacpid_wq);
1673 destroy_workqueue(kacpi_notify_wq);
1674 destroy_workqueue(kacpi_hotplug_wq);
1675
1676 return AE_OK;
1677}
1678
1679acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1680 u32 pm1b_control)
1681{
1682 int rc = 0;
1683 if (__acpi_os_prepare_sleep)
1684 rc = __acpi_os_prepare_sleep(sleep_state,
1685 pm1a_control, pm1b_control);
1686 if (rc < 0)
1687 return AE_ERROR;
1688 else if (rc > 0)
1689 return AE_CTRL_SKIP;
1690
1691 return AE_OK;
1692}
1693
1694void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1695 u32 pm1a_ctrl, u32 pm1b_ctrl))
1696{
1697 __acpi_os_prepare_sleep = func;
1698}
1699
1700acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1701 u32 val_b)
1702{
1703 int rc = 0;
1704 if (__acpi_os_prepare_extended_sleep)
1705 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1706 val_a, val_b);
1707 if (rc < 0)
1708 return AE_ERROR;
1709 else if (rc > 0)
1710 return AE_CTRL_SKIP;
1711
1712 return AE_OK;
1713}
1714
1715void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1716 u32 val_a, u32 val_b))
1717{
1718 __acpi_os_prepare_extended_sleep = func;
1719}