Merge branches 'acpi-config', 'acpi-osl', 'acpi-utils' and 'acpi-tables'
[linux-drm-fsl-dcu.git] / drivers / acpi / osl.c
1 /*
2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3  *
4  *  Copyright (C) 2000       Andrew Henroid
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  *  Copyright (c) 2008 Intel Corporation
8  *   Author: Matthew Wilcox <willy@linux.intel.com>
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or
15  *  (at your option) any later version.
16  *
17  *  This program is distributed in the hope that it will be useful,
18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  *  GNU General Public License for more details.
21  *
22  *  You should have received a copy of the GNU General Public License
23  *  along with this program; if not, write to the Free Software
24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  *
28  */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
47
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include "internal.h"
52
53 #define _COMPONENT              ACPI_OS_SERVICES
54 ACPI_MODULE_NAME("osl");
55
56 struct acpi_os_dpc {
57         acpi_osd_exec_callback function;
58         void *context;
59         struct work_struct work;
60 };
61
62 #ifdef CONFIG_ACPI_CUSTOM_DSDT
63 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
64 #endif
65
66 #ifdef ENABLE_DEBUGGER
67 #include <linux/kdb.h>
68
69 /* stuff for debugger support */
70 int acpi_in_debugger;
71 EXPORT_SYMBOL(acpi_in_debugger);
72
73 extern char line_buf[80];
74 #endif                          /*ENABLE_DEBUGGER */
75
76 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
77                                       u32 pm1b_ctrl);
78 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
79                                       u32 val_b);
80
81 static acpi_osd_handler acpi_irq_handler;
82 static void *acpi_irq_context;
83 static struct workqueue_struct *kacpid_wq;
84 static struct workqueue_struct *kacpi_notify_wq;
85 static struct workqueue_struct *kacpi_hotplug_wq;
86
87 /*
88  * This list of permanent mappings is for memory that may be accessed from
89  * interrupt context, where we can't do the ioremap().
90  */
91 struct acpi_ioremap {
92         struct list_head list;
93         void __iomem *virt;
94         acpi_physical_address phys;
95         acpi_size size;
96         unsigned long refcount;
97 };
98
99 static LIST_HEAD(acpi_ioremaps);
100 static DEFINE_MUTEX(acpi_ioremap_lock);
101
102 static void __init acpi_osi_setup_late(void);
103
104 /*
105  * The story of _OSI(Linux)
106  *
107  * From pre-history through Linux-2.6.22,
108  * Linux responded TRUE upon a BIOS OSI(Linux) query.
109  *
110  * Unfortunately, reference BIOS writers got wind of this
111  * and put OSI(Linux) in their example code, quickly exposing
112  * this string as ill-conceived and opening the door to
113  * an un-bounded number of BIOS incompatibilities.
114  *
115  * For example, OSI(Linux) was used on resume to re-POST a
116  * video card on one system, because Linux at that time
117  * could not do a speedy restore in its native driver.
118  * But then upon gaining quick native restore capability,
119  * Linux has no way to tell the BIOS to skip the time-consuming
120  * POST -- putting Linux at a permanent performance disadvantage.
121  * On another system, the BIOS writer used OSI(Linux)
122  * to infer native OS support for IPMI!  On other systems,
123  * OSI(Linux) simply got in the way of Linux claiming to
124  * be compatible with other operating systems, exposing
125  * BIOS issues such as skipped device initialization.
126  *
127  * So "Linux" turned out to be a really poor chose of
128  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
129  *
130  * BIOS writers should NOT query _OSI(Linux) on future systems.
131  * Linux will complain on the console when it sees it, and return FALSE.
132  * To get Linux to return TRUE for your system  will require
133  * a kernel source update to add a DMI entry,
134  * or boot with "acpi_osi=Linux"
135  */
136
137 static struct osi_linux {
138         unsigned int    enable:1;
139         unsigned int    dmi:1;
140         unsigned int    cmdline:1;
141         unsigned int    default_disabling:1;
142 } osi_linux = {0, 0, 0, 0};
143
144 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145 {
146         if (!strcmp("Linux", interface)) {
147
148                 printk_once(KERN_NOTICE FW_BUG PREFIX
149                         "BIOS _OSI(Linux) query %s%s\n",
150                         osi_linux.enable ? "honored" : "ignored",
151                         osi_linux.cmdline ? " via cmdline" :
152                         osi_linux.dmi ? " via DMI" : "");
153         }
154
155         if (!strcmp("Darwin", interface)) {
156                 /*
157                  * Apple firmware will behave poorly if it receives positive
158                  * answers to "Darwin" and any other OS. Respond positively
159                  * to Darwin and then disable all other vendor strings.
160                  */
161                 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
162                 supported = ACPI_UINT32_MAX;
163         }
164
165         return supported;
166 }
167
168 static void __init acpi_request_region (struct acpi_generic_address *gas,
169         unsigned int length, char *desc)
170 {
171         u64 addr;
172
173         /* Handle possible alignment issues */
174         memcpy(&addr, &gas->address, sizeof(addr));
175         if (!addr || !length)
176                 return;
177
178         /* Resources are never freed */
179         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
180                 request_region(addr, length, desc);
181         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
182                 request_mem_region(addr, length, desc);
183 }
184
185 static int __init acpi_reserve_resources(void)
186 {
187         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
188                 "ACPI PM1a_EVT_BLK");
189
190         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
191                 "ACPI PM1b_EVT_BLK");
192
193         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
194                 "ACPI PM1a_CNT_BLK");
195
196         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
197                 "ACPI PM1b_CNT_BLK");
198
199         if (acpi_gbl_FADT.pm_timer_length == 4)
200                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
201
202         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
203                 "ACPI PM2_CNT_BLK");
204
205         /* Length of GPE blocks must be a non-negative multiple of 2 */
206
207         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
208                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
209                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
210
211         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
212                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
213                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
214
215         return 0;
216 }
217 device_initcall(acpi_reserve_resources);
218
219 void acpi_os_printf(const char *fmt, ...)
220 {
221         va_list args;
222         va_start(args, fmt);
223         acpi_os_vprintf(fmt, args);
224         va_end(args);
225 }
226
227 void acpi_os_vprintf(const char *fmt, va_list args)
228 {
229         static char buffer[512];
230
231         vsprintf(buffer, fmt, args);
232
233 #ifdef ENABLE_DEBUGGER
234         if (acpi_in_debugger) {
235                 kdb_printf("%s", buffer);
236         } else {
237                 printk(KERN_CONT "%s", buffer);
238         }
239 #else
240         printk(KERN_CONT "%s", buffer);
241 #endif
242 }
243
244 #ifdef CONFIG_KEXEC
245 static unsigned long acpi_rsdp;
246 static int __init setup_acpi_rsdp(char *arg)
247 {
248         if (kstrtoul(arg, 16, &acpi_rsdp))
249                 return -EINVAL;
250         return 0;
251 }
252 early_param("acpi_rsdp", setup_acpi_rsdp);
253 #endif
254
255 acpi_physical_address __init acpi_os_get_root_pointer(void)
256 {
257 #ifdef CONFIG_KEXEC
258         if (acpi_rsdp)
259                 return acpi_rsdp;
260 #endif
261
262         if (efi_enabled(EFI_CONFIG_TABLES)) {
263                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
264                         return efi.acpi20;
265                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
266                         return efi.acpi;
267                 else {
268                         printk(KERN_ERR PREFIX
269                                "System description tables not found\n");
270                         return 0;
271                 }
272         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
273                 acpi_physical_address pa = 0;
274
275                 acpi_find_root_pointer(&pa);
276                 return pa;
277         }
278
279         return 0;
280 }
281
282 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
283 static struct acpi_ioremap *
284 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
285 {
286         struct acpi_ioremap *map;
287
288         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
289                 if (map->phys <= phys &&
290                     phys + size <= map->phys + map->size)
291                         return map;
292
293         return NULL;
294 }
295
296 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
297 static void __iomem *
298 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
299 {
300         struct acpi_ioremap *map;
301
302         map = acpi_map_lookup(phys, size);
303         if (map)
304                 return map->virt + (phys - map->phys);
305
306         return NULL;
307 }
308
309 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
310 {
311         struct acpi_ioremap *map;
312         void __iomem *virt = NULL;
313
314         mutex_lock(&acpi_ioremap_lock);
315         map = acpi_map_lookup(phys, size);
316         if (map) {
317                 virt = map->virt + (phys - map->phys);
318                 map->refcount++;
319         }
320         mutex_unlock(&acpi_ioremap_lock);
321         return virt;
322 }
323 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
324
325 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
326 static struct acpi_ioremap *
327 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
328 {
329         struct acpi_ioremap *map;
330
331         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
332                 if (map->virt <= virt &&
333                     virt + size <= map->virt + map->size)
334                         return map;
335
336         return NULL;
337 }
338
339 #ifndef CONFIG_IA64
340 #define should_use_kmap(pfn)   page_is_ram(pfn)
341 #else
342 /* ioremap will take care of cache attributes */
343 #define should_use_kmap(pfn)   0
344 #endif
345
346 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
347 {
348         unsigned long pfn;
349
350         pfn = pg_off >> PAGE_SHIFT;
351         if (should_use_kmap(pfn)) {
352                 if (pg_sz > PAGE_SIZE)
353                         return NULL;
354                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
355         } else
356                 return acpi_os_ioremap(pg_off, pg_sz);
357 }
358
359 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
360 {
361         unsigned long pfn;
362
363         pfn = pg_off >> PAGE_SHIFT;
364         if (should_use_kmap(pfn))
365                 kunmap(pfn_to_page(pfn));
366         else
367                 iounmap(vaddr);
368 }
369
370 void __iomem *__init_refok
371 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
372 {
373         struct acpi_ioremap *map;
374         void __iomem *virt;
375         acpi_physical_address pg_off;
376         acpi_size pg_sz;
377
378         if (phys > ULONG_MAX) {
379                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
380                 return NULL;
381         }
382
383         if (!acpi_gbl_permanent_mmap)
384                 return __acpi_map_table((unsigned long)phys, size);
385
386         mutex_lock(&acpi_ioremap_lock);
387         /* Check if there's a suitable mapping already. */
388         map = acpi_map_lookup(phys, size);
389         if (map) {
390                 map->refcount++;
391                 goto out;
392         }
393
394         map = kzalloc(sizeof(*map), GFP_KERNEL);
395         if (!map) {
396                 mutex_unlock(&acpi_ioremap_lock);
397                 return NULL;
398         }
399
400         pg_off = round_down(phys, PAGE_SIZE);
401         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
402         virt = acpi_map(pg_off, pg_sz);
403         if (!virt) {
404                 mutex_unlock(&acpi_ioremap_lock);
405                 kfree(map);
406                 return NULL;
407         }
408
409         INIT_LIST_HEAD(&map->list);
410         map->virt = virt;
411         map->phys = pg_off;
412         map->size = pg_sz;
413         map->refcount = 1;
414
415         list_add_tail_rcu(&map->list, &acpi_ioremaps);
416
417 out:
418         mutex_unlock(&acpi_ioremap_lock);
419         return map->virt + (phys - map->phys);
420 }
421 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
422
423 void *__init_refok
424 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
425 {
426         return (void *)acpi_os_map_iomem(phys, size);
427 }
428 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
429
430 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
431 {
432         if (!--map->refcount)
433                 list_del_rcu(&map->list);
434 }
435
436 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
437 {
438         if (!map->refcount) {
439                 synchronize_rcu_expedited();
440                 acpi_unmap(map->phys, map->virt);
441                 kfree(map);
442         }
443 }
444
445 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
446 {
447         struct acpi_ioremap *map;
448
449         if (!acpi_gbl_permanent_mmap) {
450                 __acpi_unmap_table(virt, size);
451                 return;
452         }
453
454         mutex_lock(&acpi_ioremap_lock);
455         map = acpi_map_lookup_virt(virt, size);
456         if (!map) {
457                 mutex_unlock(&acpi_ioremap_lock);
458                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
459                 return;
460         }
461         acpi_os_drop_map_ref(map);
462         mutex_unlock(&acpi_ioremap_lock);
463
464         acpi_os_map_cleanup(map);
465 }
466 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
467
468 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
469 {
470         return acpi_os_unmap_iomem((void __iomem *)virt, size);
471 }
472 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
473
474 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
475 {
476         if (!acpi_gbl_permanent_mmap)
477                 __acpi_unmap_table(virt, size);
478 }
479
480 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
481 {
482         u64 addr;
483         void __iomem *virt;
484
485         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
486                 return 0;
487
488         /* Handle possible alignment issues */
489         memcpy(&addr, &gas->address, sizeof(addr));
490         if (!addr || !gas->bit_width)
491                 return -EINVAL;
492
493         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
494         if (!virt)
495                 return -EIO;
496
497         return 0;
498 }
499 EXPORT_SYMBOL(acpi_os_map_generic_address);
500
501 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
502 {
503         u64 addr;
504         struct acpi_ioremap *map;
505
506         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
507                 return;
508
509         /* Handle possible alignment issues */
510         memcpy(&addr, &gas->address, sizeof(addr));
511         if (!addr || !gas->bit_width)
512                 return;
513
514         mutex_lock(&acpi_ioremap_lock);
515         map = acpi_map_lookup(addr, gas->bit_width / 8);
516         if (!map) {
517                 mutex_unlock(&acpi_ioremap_lock);
518                 return;
519         }
520         acpi_os_drop_map_ref(map);
521         mutex_unlock(&acpi_ioremap_lock);
522
523         acpi_os_map_cleanup(map);
524 }
525 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
526
527 #ifdef ACPI_FUTURE_USAGE
528 acpi_status
529 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
530 {
531         if (!phys || !virt)
532                 return AE_BAD_PARAMETER;
533
534         *phys = virt_to_phys(virt);
535
536         return AE_OK;
537 }
538 #endif
539
540 #define ACPI_MAX_OVERRIDE_LEN 100
541
542 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
543
544 acpi_status
545 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
546                             acpi_string * new_val)
547 {
548         if (!init_val || !new_val)
549                 return AE_BAD_PARAMETER;
550
551         *new_val = NULL;
552         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
553                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
554                        acpi_os_name);
555                 *new_val = acpi_os_name;
556         }
557
558         return AE_OK;
559 }
560
561 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
562 #include <linux/earlycpio.h>
563 #include <linux/memblock.h>
564
565 static u64 acpi_tables_addr;
566 static int all_tables_size;
567
568 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
569 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
570 {
571         u8 sum = 0;
572         u8 *end = buffer + length;
573
574         while (buffer < end)
575                 sum = (u8) (sum + *(buffer++));
576         return sum;
577 }
578
579 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
580 static const char * const table_sigs[] = {
581         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
582         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
583         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
584         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
585         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
586         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
587         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
588         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
589         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
590
591 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
592
593 #define ACPI_OVERRIDE_TABLES 64
594 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
595
596 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
597
598 void __init acpi_initrd_override(void *data, size_t size)
599 {
600         int sig, no, table_nr = 0, total_offset = 0;
601         long offset = 0;
602         struct acpi_table_header *table;
603         char cpio_path[32] = "kernel/firmware/acpi/";
604         struct cpio_data file;
605
606         if (data == NULL || size == 0)
607                 return;
608
609         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
610                 file = find_cpio_data(cpio_path, data, size, &offset);
611                 if (!file.data)
612                         break;
613
614                 data += offset;
615                 size -= offset;
616
617                 if (file.size < sizeof(struct acpi_table_header)) {
618                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
619                                 cpio_path, file.name);
620                         continue;
621                 }
622
623                 table = file.data;
624
625                 for (sig = 0; table_sigs[sig]; sig++)
626                         if (!memcmp(table->signature, table_sigs[sig], 4))
627                                 break;
628
629                 if (!table_sigs[sig]) {
630                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
631                                 cpio_path, file.name);
632                         continue;
633                 }
634                 if (file.size != table->length) {
635                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
636                                 cpio_path, file.name);
637                         continue;
638                 }
639                 if (acpi_table_checksum(file.data, table->length)) {
640                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
641                                 cpio_path, file.name);
642                         continue;
643                 }
644
645                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
646                         table->signature, cpio_path, file.name, table->length);
647
648                 all_tables_size += table->length;
649                 acpi_initrd_files[table_nr].data = file.data;
650                 acpi_initrd_files[table_nr].size = file.size;
651                 table_nr++;
652         }
653         if (table_nr == 0)
654                 return;
655
656         acpi_tables_addr =
657                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
658                                        all_tables_size, PAGE_SIZE);
659         if (!acpi_tables_addr) {
660                 WARN_ON(1);
661                 return;
662         }
663         /*
664          * Only calling e820_add_reserve does not work and the
665          * tables are invalid (memory got used) later.
666          * memblock_reserve works as expected and the tables won't get modified.
667          * But it's not enough on X86 because ioremap will
668          * complain later (used by acpi_os_map_memory) that the pages
669          * that should get mapped are not marked "reserved".
670          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
671          * works fine.
672          */
673         memblock_reserve(acpi_tables_addr, all_tables_size);
674         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
675
676         /*
677          * early_ioremap only can remap 256k one time. If we map all
678          * tables one time, we will hit the limit. Need to map chunks
679          * one by one during copying the same as that in relocate_initrd().
680          */
681         for (no = 0; no < table_nr; no++) {
682                 unsigned char *src_p = acpi_initrd_files[no].data;
683                 phys_addr_t size = acpi_initrd_files[no].size;
684                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
685                 phys_addr_t slop, clen;
686                 char *dest_p;
687
688                 total_offset += size;
689
690                 while (size) {
691                         slop = dest_addr & ~PAGE_MASK;
692                         clen = size;
693                         if (clen > MAP_CHUNK_SIZE - slop)
694                                 clen = MAP_CHUNK_SIZE - slop;
695                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
696                                                  clen + slop);
697                         memcpy(dest_p + slop, src_p, clen);
698                         early_iounmap(dest_p, clen + slop);
699                         src_p += clen;
700                         dest_addr += clen;
701                         size -= clen;
702                 }
703         }
704 }
705 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
706
707 static void acpi_table_taint(struct acpi_table_header *table)
708 {
709         pr_warn(PREFIX
710                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
711                 table->signature, table->oem_table_id);
712         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
713 }
714
715
716 acpi_status
717 acpi_os_table_override(struct acpi_table_header * existing_table,
718                        struct acpi_table_header ** new_table)
719 {
720         if (!existing_table || !new_table)
721                 return AE_BAD_PARAMETER;
722
723         *new_table = NULL;
724
725 #ifdef CONFIG_ACPI_CUSTOM_DSDT
726         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
727                 *new_table = (struct acpi_table_header *)AmlCode;
728 #endif
729         if (*new_table != NULL)
730                 acpi_table_taint(existing_table);
731         return AE_OK;
732 }
733
734 acpi_status
735 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
736                                 acpi_physical_address *address,
737                                 u32 *table_length)
738 {
739 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
740         *table_length = 0;
741         *address = 0;
742         return AE_OK;
743 #else
744         int table_offset = 0;
745         struct acpi_table_header *table;
746
747         *table_length = 0;
748         *address = 0;
749
750         if (!acpi_tables_addr)
751                 return AE_OK;
752
753         do {
754                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
755                         WARN_ON(1);
756                         return AE_OK;
757                 }
758
759                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
760                                            ACPI_HEADER_SIZE);
761
762                 if (table_offset + table->length > all_tables_size) {
763                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
764                         WARN_ON(1);
765                         return AE_OK;
766                 }
767
768                 table_offset += table->length;
769
770                 if (memcmp(existing_table->signature, table->signature, 4)) {
771                         acpi_os_unmap_memory(table,
772                                      ACPI_HEADER_SIZE);
773                         continue;
774                 }
775
776                 /* Only override tables with matching oem id */
777                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
778                            ACPI_OEM_TABLE_ID_SIZE)) {
779                         acpi_os_unmap_memory(table,
780                                      ACPI_HEADER_SIZE);
781                         continue;
782                 }
783
784                 table_offset -= table->length;
785                 *table_length = table->length;
786                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
787                 *address = acpi_tables_addr + table_offset;
788                 break;
789         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
790
791         if (*address != 0)
792                 acpi_table_taint(existing_table);
793         return AE_OK;
794 #endif
795 }
796
797 static irqreturn_t acpi_irq(int irq, void *dev_id)
798 {
799         u32 handled;
800
801         handled = (*acpi_irq_handler) (acpi_irq_context);
802
803         if (handled) {
804                 acpi_irq_handled++;
805                 return IRQ_HANDLED;
806         } else {
807                 acpi_irq_not_handled++;
808                 return IRQ_NONE;
809         }
810 }
811
812 acpi_status
813 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
814                                   void *context)
815 {
816         unsigned int irq;
817
818         acpi_irq_stats_init();
819
820         /*
821          * ACPI interrupts different from the SCI in our copy of the FADT are
822          * not supported.
823          */
824         if (gsi != acpi_gbl_FADT.sci_interrupt)
825                 return AE_BAD_PARAMETER;
826
827         if (acpi_irq_handler)
828                 return AE_ALREADY_ACQUIRED;
829
830         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
831                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
832                        gsi);
833                 return AE_OK;
834         }
835
836         acpi_irq_handler = handler;
837         acpi_irq_context = context;
838         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
839                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
840                 acpi_irq_handler = NULL;
841                 return AE_NOT_ACQUIRED;
842         }
843
844         return AE_OK;
845 }
846
847 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
848 {
849         if (irq != acpi_gbl_FADT.sci_interrupt)
850                 return AE_BAD_PARAMETER;
851
852         free_irq(irq, acpi_irq);
853         acpi_irq_handler = NULL;
854
855         return AE_OK;
856 }
857
858 /*
859  * Running in interpreter thread context, safe to sleep
860  */
861
862 void acpi_os_sleep(u64 ms)
863 {
864         msleep(ms);
865 }
866
867 void acpi_os_stall(u32 us)
868 {
869         while (us) {
870                 u32 delay = 1000;
871
872                 if (delay > us)
873                         delay = us;
874                 udelay(delay);
875                 touch_nmi_watchdog();
876                 us -= delay;
877         }
878 }
879
880 /*
881  * Support ACPI 3.0 AML Timer operand
882  * Returns 64-bit free-running, monotonically increasing timer
883  * with 100ns granularity
884  */
885 u64 acpi_os_get_timer(void)
886 {
887         u64 time_ns = ktime_to_ns(ktime_get());
888         do_div(time_ns, 100);
889         return time_ns;
890 }
891
892 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
893 {
894         u32 dummy;
895
896         if (!value)
897                 value = &dummy;
898
899         *value = 0;
900         if (width <= 8) {
901                 *(u8 *) value = inb(port);
902         } else if (width <= 16) {
903                 *(u16 *) value = inw(port);
904         } else if (width <= 32) {
905                 *(u32 *) value = inl(port);
906         } else {
907                 BUG();
908         }
909
910         return AE_OK;
911 }
912
913 EXPORT_SYMBOL(acpi_os_read_port);
914
915 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
916 {
917         if (width <= 8) {
918                 outb(value, port);
919         } else if (width <= 16) {
920                 outw(value, port);
921         } else if (width <= 32) {
922                 outl(value, port);
923         } else {
924                 BUG();
925         }
926
927         return AE_OK;
928 }
929
930 EXPORT_SYMBOL(acpi_os_write_port);
931
932 #ifdef readq
933 static inline u64 read64(const volatile void __iomem *addr)
934 {
935         return readq(addr);
936 }
937 #else
938 static inline u64 read64(const volatile void __iomem *addr)
939 {
940         u64 l, h;
941         l = readl(addr);
942         h = readl(addr+4);
943         return l | (h << 32);
944 }
945 #endif
946
947 acpi_status
948 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
949 {
950         void __iomem *virt_addr;
951         unsigned int size = width / 8;
952         bool unmap = false;
953         u64 dummy;
954
955         rcu_read_lock();
956         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
957         if (!virt_addr) {
958                 rcu_read_unlock();
959                 virt_addr = acpi_os_ioremap(phys_addr, size);
960                 if (!virt_addr)
961                         return AE_BAD_ADDRESS;
962                 unmap = true;
963         }
964
965         if (!value)
966                 value = &dummy;
967
968         switch (width) {
969         case 8:
970                 *(u8 *) value = readb(virt_addr);
971                 break;
972         case 16:
973                 *(u16 *) value = readw(virt_addr);
974                 break;
975         case 32:
976                 *(u32 *) value = readl(virt_addr);
977                 break;
978         case 64:
979                 *(u64 *) value = read64(virt_addr);
980                 break;
981         default:
982                 BUG();
983         }
984
985         if (unmap)
986                 iounmap(virt_addr);
987         else
988                 rcu_read_unlock();
989
990         return AE_OK;
991 }
992
993 #ifdef writeq
994 static inline void write64(u64 val, volatile void __iomem *addr)
995 {
996         writeq(val, addr);
997 }
998 #else
999 static inline void write64(u64 val, volatile void __iomem *addr)
1000 {
1001         writel(val, addr);
1002         writel(val>>32, addr+4);
1003 }
1004 #endif
1005
1006 acpi_status
1007 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1008 {
1009         void __iomem *virt_addr;
1010         unsigned int size = width / 8;
1011         bool unmap = false;
1012
1013         rcu_read_lock();
1014         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1015         if (!virt_addr) {
1016                 rcu_read_unlock();
1017                 virt_addr = acpi_os_ioremap(phys_addr, size);
1018                 if (!virt_addr)
1019                         return AE_BAD_ADDRESS;
1020                 unmap = true;
1021         }
1022
1023         switch (width) {
1024         case 8:
1025                 writeb(value, virt_addr);
1026                 break;
1027         case 16:
1028                 writew(value, virt_addr);
1029                 break;
1030         case 32:
1031                 writel(value, virt_addr);
1032                 break;
1033         case 64:
1034                 write64(value, virt_addr);
1035                 break;
1036         default:
1037                 BUG();
1038         }
1039
1040         if (unmap)
1041                 iounmap(virt_addr);
1042         else
1043                 rcu_read_unlock();
1044
1045         return AE_OK;
1046 }
1047
1048 acpi_status
1049 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1050                                u64 *value, u32 width)
1051 {
1052         int result, size;
1053         u32 value32;
1054
1055         if (!value)
1056                 return AE_BAD_PARAMETER;
1057
1058         switch (width) {
1059         case 8:
1060                 size = 1;
1061                 break;
1062         case 16:
1063                 size = 2;
1064                 break;
1065         case 32:
1066                 size = 4;
1067                 break;
1068         default:
1069                 return AE_ERROR;
1070         }
1071
1072         result = raw_pci_read(pci_id->segment, pci_id->bus,
1073                                 PCI_DEVFN(pci_id->device, pci_id->function),
1074                                 reg, size, &value32);
1075         *value = value32;
1076
1077         return (result ? AE_ERROR : AE_OK);
1078 }
1079
1080 acpi_status
1081 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1082                                 u64 value, u32 width)
1083 {
1084         int result, size;
1085
1086         switch (width) {
1087         case 8:
1088                 size = 1;
1089                 break;
1090         case 16:
1091                 size = 2;
1092                 break;
1093         case 32:
1094                 size = 4;
1095                 break;
1096         default:
1097                 return AE_ERROR;
1098         }
1099
1100         result = raw_pci_write(pci_id->segment, pci_id->bus,
1101                                 PCI_DEVFN(pci_id->device, pci_id->function),
1102                                 reg, size, value);
1103
1104         return (result ? AE_ERROR : AE_OK);
1105 }
1106
1107 static void acpi_os_execute_deferred(struct work_struct *work)
1108 {
1109         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1110
1111         dpc->function(dpc->context);
1112         kfree(dpc);
1113 }
1114
1115 /*******************************************************************************
1116  *
1117  * FUNCTION:    acpi_os_execute
1118  *
1119  * PARAMETERS:  Type               - Type of the callback
1120  *              Function           - Function to be executed
1121  *              Context            - Function parameters
1122  *
1123  * RETURN:      Status
1124  *
1125  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1126  *              immediately executes function on a separate thread.
1127  *
1128  ******************************************************************************/
1129
1130 acpi_status acpi_os_execute(acpi_execute_type type,
1131                             acpi_osd_exec_callback function, void *context)
1132 {
1133         acpi_status status = AE_OK;
1134         struct acpi_os_dpc *dpc;
1135         struct workqueue_struct *queue;
1136         int ret;
1137         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1138                           "Scheduling function [%p(%p)] for deferred execution.\n",
1139                           function, context));
1140
1141         /*
1142          * Allocate/initialize DPC structure.  Note that this memory will be
1143          * freed by the callee.  The kernel handles the work_struct list  in a
1144          * way that allows us to also free its memory inside the callee.
1145          * Because we may want to schedule several tasks with different
1146          * parameters we can't use the approach some kernel code uses of
1147          * having a static work_struct.
1148          */
1149
1150         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1151         if (!dpc)
1152                 return AE_NO_MEMORY;
1153
1154         dpc->function = function;
1155         dpc->context = context;
1156
1157         /*
1158          * To prevent lockdep from complaining unnecessarily, make sure that
1159          * there is a different static lockdep key for each workqueue by using
1160          * INIT_WORK() for each of them separately.
1161          */
1162         if (type == OSL_NOTIFY_HANDLER) {
1163                 queue = kacpi_notify_wq;
1164                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1165         } else {
1166                 queue = kacpid_wq;
1167                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1168         }
1169
1170         /*
1171          * On some machines, a software-initiated SMI causes corruption unless
1172          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1173          * typically it's done in GPE-related methods that are run via
1174          * workqueues, so we can avoid the known corruption cases by always
1175          * queueing on CPU 0.
1176          */
1177         ret = queue_work_on(0, queue, &dpc->work);
1178
1179         if (!ret) {
1180                 printk(KERN_ERR PREFIX
1181                           "Call to queue_work() failed.\n");
1182                 status = AE_ERROR;
1183                 kfree(dpc);
1184         }
1185         return status;
1186 }
1187 EXPORT_SYMBOL(acpi_os_execute);
1188
1189 void acpi_os_wait_events_complete(void)
1190 {
1191         /*
1192          * Make sure the GPE handler or the fixed event handler is not used
1193          * on another CPU after removal.
1194          */
1195         if (acpi_irq_handler)
1196                 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt);
1197         flush_workqueue(kacpid_wq);
1198         flush_workqueue(kacpi_notify_wq);
1199 }
1200
1201 struct acpi_hp_work {
1202         struct work_struct work;
1203         struct acpi_device *adev;
1204         u32 src;
1205 };
1206
1207 static void acpi_hotplug_work_fn(struct work_struct *work)
1208 {
1209         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1210
1211         acpi_os_wait_events_complete();
1212         acpi_device_hotplug(hpw->adev, hpw->src);
1213         kfree(hpw);
1214 }
1215
1216 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1217 {
1218         struct acpi_hp_work *hpw;
1219
1220         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1221                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1222                   adev, src));
1223
1224         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1225         if (!hpw)
1226                 return AE_NO_MEMORY;
1227
1228         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1229         hpw->adev = adev;
1230         hpw->src = src;
1231         /*
1232          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1233          * the hotplug code may call driver .remove() functions, which may
1234          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1235          * these workqueues.
1236          */
1237         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1238                 kfree(hpw);
1239                 return AE_ERROR;
1240         }
1241         return AE_OK;
1242 }
1243
1244 bool acpi_queue_hotplug_work(struct work_struct *work)
1245 {
1246         return queue_work(kacpi_hotplug_wq, work);
1247 }
1248
1249 acpi_status
1250 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1251 {
1252         struct semaphore *sem = NULL;
1253
1254         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1255         if (!sem)
1256                 return AE_NO_MEMORY;
1257
1258         sema_init(sem, initial_units);
1259
1260         *handle = (acpi_handle *) sem;
1261
1262         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1263                           *handle, initial_units));
1264
1265         return AE_OK;
1266 }
1267
1268 /*
1269  * TODO: A better way to delete semaphores?  Linux doesn't have a
1270  * 'delete_semaphore()' function -- may result in an invalid
1271  * pointer dereference for non-synchronized consumers.  Should
1272  * we at least check for blocked threads and signal/cancel them?
1273  */
1274
1275 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1276 {
1277         struct semaphore *sem = (struct semaphore *)handle;
1278
1279         if (!sem)
1280                 return AE_BAD_PARAMETER;
1281
1282         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1283
1284         BUG_ON(!list_empty(&sem->wait_list));
1285         kfree(sem);
1286         sem = NULL;
1287
1288         return AE_OK;
1289 }
1290
1291 /*
1292  * TODO: Support for units > 1?
1293  */
1294 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1295 {
1296         acpi_status status = AE_OK;
1297         struct semaphore *sem = (struct semaphore *)handle;
1298         long jiffies;
1299         int ret = 0;
1300
1301         if (!sem || (units < 1))
1302                 return AE_BAD_PARAMETER;
1303
1304         if (units > 1)
1305                 return AE_SUPPORT;
1306
1307         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1308                           handle, units, timeout));
1309
1310         if (timeout == ACPI_WAIT_FOREVER)
1311                 jiffies = MAX_SCHEDULE_TIMEOUT;
1312         else
1313                 jiffies = msecs_to_jiffies(timeout);
1314
1315         ret = down_timeout(sem, jiffies);
1316         if (ret)
1317                 status = AE_TIME;
1318
1319         if (ACPI_FAILURE(status)) {
1320                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1321                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1322                                   handle, units, timeout,
1323                                   acpi_format_exception(status)));
1324         } else {
1325                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1326                                   "Acquired semaphore[%p|%d|%d]", handle,
1327                                   units, timeout));
1328         }
1329
1330         return status;
1331 }
1332
1333 /*
1334  * TODO: Support for units > 1?
1335  */
1336 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1337 {
1338         struct semaphore *sem = (struct semaphore *)handle;
1339
1340         if (!sem || (units < 1))
1341                 return AE_BAD_PARAMETER;
1342
1343         if (units > 1)
1344                 return AE_SUPPORT;
1345
1346         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1347                           units));
1348
1349         up(sem);
1350
1351         return AE_OK;
1352 }
1353
1354 #ifdef ACPI_FUTURE_USAGE
1355 u32 acpi_os_get_line(char *buffer)
1356 {
1357
1358 #ifdef ENABLE_DEBUGGER
1359         if (acpi_in_debugger) {
1360                 u32 chars;
1361
1362                 kdb_read(buffer, sizeof(line_buf));
1363
1364                 /* remove the CR kdb includes */
1365                 chars = strlen(buffer) - 1;
1366                 buffer[chars] = '\0';
1367         }
1368 #endif
1369
1370         return 0;
1371 }
1372 #endif                          /*  ACPI_FUTURE_USAGE  */
1373
1374 acpi_status acpi_os_signal(u32 function, void *info)
1375 {
1376         switch (function) {
1377         case ACPI_SIGNAL_FATAL:
1378                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1379                 break;
1380         case ACPI_SIGNAL_BREAKPOINT:
1381                 /*
1382                  * AML Breakpoint
1383                  * ACPI spec. says to treat it as a NOP unless
1384                  * you are debugging.  So if/when we integrate
1385                  * AML debugger into the kernel debugger its
1386                  * hook will go here.  But until then it is
1387                  * not useful to print anything on breakpoints.
1388                  */
1389                 break;
1390         default:
1391                 break;
1392         }
1393
1394         return AE_OK;
1395 }
1396
1397 static int __init acpi_os_name_setup(char *str)
1398 {
1399         char *p = acpi_os_name;
1400         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1401
1402         if (!str || !*str)
1403                 return 0;
1404
1405         for (; count-- && *str; str++) {
1406                 if (isalnum(*str) || *str == ' ' || *str == ':')
1407                         *p++ = *str;
1408                 else if (*str == '\'' || *str == '"')
1409                         continue;
1410                 else
1411                         break;
1412         }
1413         *p = 0;
1414
1415         return 1;
1416
1417 }
1418
1419 __setup("acpi_os_name=", acpi_os_name_setup);
1420
1421 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1422 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1423
1424 struct osi_setup_entry {
1425         char string[OSI_STRING_LENGTH_MAX];
1426         bool enable;
1427 };
1428
1429 static struct osi_setup_entry
1430                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1431         {"Module Device", true},
1432         {"Processor Device", true},
1433         {"3.0 _SCP Extensions", true},
1434         {"Processor Aggregator Device", true},
1435 };
1436
1437 void __init acpi_osi_setup(char *str)
1438 {
1439         struct osi_setup_entry *osi;
1440         bool enable = true;
1441         int i;
1442
1443         if (!acpi_gbl_create_osi_method)
1444                 return;
1445
1446         if (str == NULL || *str == '\0') {
1447                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1448                 acpi_gbl_create_osi_method = FALSE;
1449                 return;
1450         }
1451
1452         if (*str == '!') {
1453                 str++;
1454                 if (*str == '\0') {
1455                         osi_linux.default_disabling = 1;
1456                         return;
1457                 } else if (*str == '*') {
1458                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1459                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1460                                 osi = &osi_setup_entries[i];
1461                                 osi->enable = false;
1462                         }
1463                         return;
1464                 }
1465                 enable = false;
1466         }
1467
1468         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1469                 osi = &osi_setup_entries[i];
1470                 if (!strcmp(osi->string, str)) {
1471                         osi->enable = enable;
1472                         break;
1473                 } else if (osi->string[0] == '\0') {
1474                         osi->enable = enable;
1475                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1476                         break;
1477                 }
1478         }
1479 }
1480
1481 static void __init set_osi_linux(unsigned int enable)
1482 {
1483         if (osi_linux.enable != enable)
1484                 osi_linux.enable = enable;
1485
1486         if (osi_linux.enable)
1487                 acpi_osi_setup("Linux");
1488         else
1489                 acpi_osi_setup("!Linux");
1490
1491         return;
1492 }
1493
1494 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1495 {
1496         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1497         osi_linux.dmi = 0;
1498         set_osi_linux(enable);
1499
1500         return;
1501 }
1502
1503 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1504 {
1505         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1506
1507         if (enable == -1)
1508                 return;
1509
1510         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1511         set_osi_linux(enable);
1512
1513         return;
1514 }
1515
1516 /*
1517  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1518  *
1519  * empty string disables _OSI
1520  * string starting with '!' disables that string
1521  * otherwise string is added to list, augmenting built-in strings
1522  */
1523 static void __init acpi_osi_setup_late(void)
1524 {
1525         struct osi_setup_entry *osi;
1526         char *str;
1527         int i;
1528         acpi_status status;
1529
1530         if (osi_linux.default_disabling) {
1531                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1532
1533                 if (ACPI_SUCCESS(status))
1534                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1535         }
1536
1537         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1538                 osi = &osi_setup_entries[i];
1539                 str = osi->string;
1540
1541                 if (*str == '\0')
1542                         break;
1543                 if (osi->enable) {
1544                         status = acpi_install_interface(str);
1545
1546                         if (ACPI_SUCCESS(status))
1547                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1548                 } else {
1549                         status = acpi_remove_interface(str);
1550
1551                         if (ACPI_SUCCESS(status))
1552                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1553                 }
1554         }
1555 }
1556
1557 static int __init osi_setup(char *str)
1558 {
1559         if (str && !strcmp("Linux", str))
1560                 acpi_cmdline_osi_linux(1);
1561         else if (str && !strcmp("!Linux", str))
1562                 acpi_cmdline_osi_linux(0);
1563         else
1564                 acpi_osi_setup(str);
1565
1566         return 1;
1567 }
1568
1569 __setup("acpi_osi=", osi_setup);
1570
1571 /*
1572  * Disable the auto-serialization of named objects creation methods.
1573  *
1574  * This feature is enabled by default.  It marks the AML control methods
1575  * that contain the opcodes to create named objects as "Serialized".
1576  */
1577 static int __init acpi_no_auto_serialize_setup(char *str)
1578 {
1579         acpi_gbl_auto_serialize_methods = FALSE;
1580         pr_info("ACPI: auto-serialization disabled\n");
1581
1582         return 1;
1583 }
1584
1585 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1586
1587 /* Check of resource interference between native drivers and ACPI
1588  * OperationRegions (SystemIO and System Memory only).
1589  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1590  * in arbitrary AML code and can interfere with legacy drivers.
1591  * acpi_enforce_resources= can be set to:
1592  *
1593  *   - strict (default) (2)
1594  *     -> further driver trying to access the resources will not load
1595  *   - lax              (1)
1596  *     -> further driver trying to access the resources will load, but you
1597  *     get a system message that something might go wrong...
1598  *
1599  *   - no               (0)
1600  *     -> ACPI Operation Region resources will not be registered
1601  *
1602  */
1603 #define ENFORCE_RESOURCES_STRICT 2
1604 #define ENFORCE_RESOURCES_LAX    1
1605 #define ENFORCE_RESOURCES_NO     0
1606
1607 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1608
1609 static int __init acpi_enforce_resources_setup(char *str)
1610 {
1611         if (str == NULL || *str == '\0')
1612                 return 0;
1613
1614         if (!strcmp("strict", str))
1615                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1616         else if (!strcmp("lax", str))
1617                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1618         else if (!strcmp("no", str))
1619                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1620
1621         return 1;
1622 }
1623
1624 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1625
1626 /* Check for resource conflicts between ACPI OperationRegions and native
1627  * drivers */
1628 int acpi_check_resource_conflict(const struct resource *res)
1629 {
1630         acpi_adr_space_type space_id;
1631         acpi_size length;
1632         u8 warn = 0;
1633         int clash = 0;
1634
1635         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1636                 return 0;
1637         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1638                 return 0;
1639
1640         if (res->flags & IORESOURCE_IO)
1641                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1642         else
1643                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1644
1645         length = resource_size(res);
1646         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1647                 warn = 1;
1648         clash = acpi_check_address_range(space_id, res->start, length, warn);
1649
1650         if (clash) {
1651                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1652                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1653                                 printk(KERN_NOTICE "ACPI: This conflict may"
1654                                        " cause random problems and system"
1655                                        " instability\n");
1656                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1657                                " for this device, you should use it instead of"
1658                                " the native driver\n");
1659                 }
1660                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1661                         return -EBUSY;
1662         }
1663         return 0;
1664 }
1665 EXPORT_SYMBOL(acpi_check_resource_conflict);
1666
1667 int acpi_check_region(resource_size_t start, resource_size_t n,
1668                       const char *name)
1669 {
1670         struct resource res = {
1671                 .start = start,
1672                 .end   = start + n - 1,
1673                 .name  = name,
1674                 .flags = IORESOURCE_IO,
1675         };
1676
1677         return acpi_check_resource_conflict(&res);
1678 }
1679 EXPORT_SYMBOL(acpi_check_region);
1680
1681 /*
1682  * Let drivers know whether the resource checks are effective
1683  */
1684 int acpi_resources_are_enforced(void)
1685 {
1686         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1687 }
1688 EXPORT_SYMBOL(acpi_resources_are_enforced);
1689
1690 /*
1691  * Deallocate the memory for a spinlock.
1692  */
1693 void acpi_os_delete_lock(acpi_spinlock handle)
1694 {
1695         ACPI_FREE(handle);
1696 }
1697
1698 /*
1699  * Acquire a spinlock.
1700  *
1701  * handle is a pointer to the spinlock_t.
1702  */
1703
1704 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1705 {
1706         acpi_cpu_flags flags;
1707         spin_lock_irqsave(lockp, flags);
1708         return flags;
1709 }
1710
1711 /*
1712  * Release a spinlock. See above.
1713  */
1714
1715 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1716 {
1717         spin_unlock_irqrestore(lockp, flags);
1718 }
1719
1720 #ifndef ACPI_USE_LOCAL_CACHE
1721
1722 /*******************************************************************************
1723  *
1724  * FUNCTION:    acpi_os_create_cache
1725  *
1726  * PARAMETERS:  name      - Ascii name for the cache
1727  *              size      - Size of each cached object
1728  *              depth     - Maximum depth of the cache (in objects) <ignored>
1729  *              cache     - Where the new cache object is returned
1730  *
1731  * RETURN:      status
1732  *
1733  * DESCRIPTION: Create a cache object
1734  *
1735  ******************************************************************************/
1736
1737 acpi_status
1738 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1739 {
1740         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1741         if (*cache == NULL)
1742                 return AE_ERROR;
1743         else
1744                 return AE_OK;
1745 }
1746
1747 /*******************************************************************************
1748  *
1749  * FUNCTION:    acpi_os_purge_cache
1750  *
1751  * PARAMETERS:  Cache           - Handle to cache object
1752  *
1753  * RETURN:      Status
1754  *
1755  * DESCRIPTION: Free all objects within the requested cache.
1756  *
1757  ******************************************************************************/
1758
1759 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1760 {
1761         kmem_cache_shrink(cache);
1762         return (AE_OK);
1763 }
1764
1765 /*******************************************************************************
1766  *
1767  * FUNCTION:    acpi_os_delete_cache
1768  *
1769  * PARAMETERS:  Cache           - Handle to cache object
1770  *
1771  * RETURN:      Status
1772  *
1773  * DESCRIPTION: Free all objects within the requested cache and delete the
1774  *              cache object.
1775  *
1776  ******************************************************************************/
1777
1778 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1779 {
1780         kmem_cache_destroy(cache);
1781         return (AE_OK);
1782 }
1783
1784 /*******************************************************************************
1785  *
1786  * FUNCTION:    acpi_os_release_object
1787  *
1788  * PARAMETERS:  Cache       - Handle to cache object
1789  *              Object      - The object to be released
1790  *
1791  * RETURN:      None
1792  *
1793  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1794  *              the object is deleted.
1795  *
1796  ******************************************************************************/
1797
1798 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1799 {
1800         kmem_cache_free(cache, object);
1801         return (AE_OK);
1802 }
1803 #endif
1804
1805 static int __init acpi_no_static_ssdt_setup(char *s)
1806 {
1807         acpi_gbl_disable_ssdt_table_install = TRUE;
1808         pr_info("ACPI: static SSDT installation disabled\n");
1809
1810         return 0;
1811 }
1812
1813 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1814
1815 static int __init acpi_disable_return_repair(char *s)
1816 {
1817         printk(KERN_NOTICE PREFIX
1818                "ACPI: Predefined validation mechanism disabled\n");
1819         acpi_gbl_disable_auto_repair = TRUE;
1820
1821         return 1;
1822 }
1823
1824 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1825
1826 acpi_status __init acpi_os_initialize(void)
1827 {
1828         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1829         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1830         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1831         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1832         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1833                 /*
1834                  * Use acpi_os_map_generic_address to pre-map the reset
1835                  * register if it's in system memory.
1836                  */
1837                 int rv;
1838
1839                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1840                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1841         }
1842
1843         return AE_OK;
1844 }
1845
1846 acpi_status __init acpi_os_initialize1(void)
1847 {
1848         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1849         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1850         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1851         BUG_ON(!kacpid_wq);
1852         BUG_ON(!kacpi_notify_wq);
1853         BUG_ON(!kacpi_hotplug_wq);
1854         acpi_install_interface_handler(acpi_osi_handler);
1855         acpi_osi_setup_late();
1856         return AE_OK;
1857 }
1858
1859 acpi_status acpi_os_terminate(void)
1860 {
1861         if (acpi_irq_handler) {
1862                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1863                                                  acpi_irq_handler);
1864         }
1865
1866         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1867         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1868         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1869         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1870         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1871                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1872
1873         destroy_workqueue(kacpid_wq);
1874         destroy_workqueue(kacpi_notify_wq);
1875         destroy_workqueue(kacpi_hotplug_wq);
1876
1877         return AE_OK;
1878 }
1879
1880 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1881                                   u32 pm1b_control)
1882 {
1883         int rc = 0;
1884         if (__acpi_os_prepare_sleep)
1885                 rc = __acpi_os_prepare_sleep(sleep_state,
1886                                              pm1a_control, pm1b_control);
1887         if (rc < 0)
1888                 return AE_ERROR;
1889         else if (rc > 0)
1890                 return AE_CTRL_SKIP;
1891
1892         return AE_OK;
1893 }
1894
1895 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1896                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1897 {
1898         __acpi_os_prepare_sleep = func;
1899 }
1900
1901 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1902                                   u32 val_b)
1903 {
1904         int rc = 0;
1905         if (__acpi_os_prepare_extended_sleep)
1906                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1907                                              val_a, val_b);
1908         if (rc < 0)
1909                 return AE_ERROR;
1910         else if (rc > 0)
1911                 return AE_CTRL_SKIP;
1912
1913         return AE_OK;
1914 }
1915
1916 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1917                                u32 val_a, u32 val_b))
1918 {
1919         __acpi_os_prepare_extended_sleep = func;
1920 }