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Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / osl.c
blob98f5316aad7277053d58a205c28d2952128b35b9
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 fs_initcall_sync(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 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
340 /* ioremap will take care of cache attributes */
341 #define should_use_kmap(pfn) 0
342 #else
343 #define should_use_kmap(pfn) page_is_ram(pfn)
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 }
Linux with added FPC-III support