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Merge tag 'pm+acpi-3.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[deliverable/linux.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 return supported;
156 }
157
158 static void __init acpi_request_region (struct acpi_generic_address *gas,
159 unsigned int length, char *desc)
160 {
161 u64 addr;
162
163 /* Handle possible alignment issues */
164 memcpy(&addr, &gas->address, sizeof(addr));
165 if (!addr || !length)
166 return;
167
168 /* Resources are never freed */
169 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
170 request_region(addr, length, desc);
171 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
172 request_mem_region(addr, length, desc);
173 }
174
175 static int __init acpi_reserve_resources(void)
176 {
177 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
178 "ACPI PM1a_EVT_BLK");
179
180 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
181 "ACPI PM1b_EVT_BLK");
182
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
184 "ACPI PM1a_CNT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
187 "ACPI PM1b_CNT_BLK");
188
189 if (acpi_gbl_FADT.pm_timer_length == 4)
190 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
193 "ACPI PM2_CNT_BLK");
194
195 /* Length of GPE blocks must be a non-negative multiple of 2 */
196
197 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
198 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
199 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200
201 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
202 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
203 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
204
205 return 0;
206 }
207 device_initcall(acpi_reserve_resources);
208
209 void acpi_os_printf(const char *fmt, ...)
210 {
211 va_list args;
212 va_start(args, fmt);
213 acpi_os_vprintf(fmt, args);
214 va_end(args);
215 }
216
217 void acpi_os_vprintf(const char *fmt, va_list args)
218 {
219 static char buffer[512];
220
221 vsprintf(buffer, fmt, args);
222
223 #ifdef ENABLE_DEBUGGER
224 if (acpi_in_debugger) {
225 kdb_printf("%s", buffer);
226 } else {
227 printk(KERN_CONT "%s", buffer);
228 }
229 #else
230 printk(KERN_CONT "%s", buffer);
231 #endif
232 }
233
234 #ifdef CONFIG_KEXEC
235 static unsigned long acpi_rsdp;
236 static int __init setup_acpi_rsdp(char *arg)
237 {
238 if (kstrtoul(arg, 16, &acpi_rsdp))
239 return -EINVAL;
240 return 0;
241 }
242 early_param("acpi_rsdp", setup_acpi_rsdp);
243 #endif
244
245 acpi_physical_address __init acpi_os_get_root_pointer(void)
246 {
247 #ifdef CONFIG_KEXEC
248 if (acpi_rsdp)
249 return acpi_rsdp;
250 #endif
251
252 if (efi_enabled(EFI_CONFIG_TABLES)) {
253 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
254 return efi.acpi20;
255 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
256 return efi.acpi;
257 else {
258 printk(KERN_ERR PREFIX
259 "System description tables not found\n");
260 return 0;
261 }
262 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
263 acpi_physical_address pa = 0;
264
265 acpi_find_root_pointer(&pa);
266 return pa;
267 }
268
269 return 0;
270 }
271
272 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
273 static struct acpi_ioremap *
274 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
275 {
276 struct acpi_ioremap *map;
277
278 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
279 if (map->phys <= phys &&
280 phys + size <= map->phys + map->size)
281 return map;
282
283 return NULL;
284 }
285
286 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
287 static void __iomem *
288 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
289 {
290 struct acpi_ioremap *map;
291
292 map = acpi_map_lookup(phys, size);
293 if (map)
294 return map->virt + (phys - map->phys);
295
296 return NULL;
297 }
298
299 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
300 {
301 struct acpi_ioremap *map;
302 void __iomem *virt = NULL;
303
304 mutex_lock(&acpi_ioremap_lock);
305 map = acpi_map_lookup(phys, size);
306 if (map) {
307 virt = map->virt + (phys - map->phys);
308 map->refcount++;
309 }
310 mutex_unlock(&acpi_ioremap_lock);
311 return virt;
312 }
313 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
314
315 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
316 static struct acpi_ioremap *
317 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
318 {
319 struct acpi_ioremap *map;
320
321 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
322 if (map->virt <= virt &&
323 virt + size <= map->virt + map->size)
324 return map;
325
326 return NULL;
327 }
328
329 #ifndef CONFIG_IA64
330 #define should_use_kmap(pfn) page_is_ram(pfn)
331 #else
332 /* ioremap will take care of cache attributes */
333 #define should_use_kmap(pfn) 0
334 #endif
335
336 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
337 {
338 unsigned long pfn;
339
340 pfn = pg_off >> PAGE_SHIFT;
341 if (should_use_kmap(pfn)) {
342 if (pg_sz > PAGE_SIZE)
343 return NULL;
344 return (void __iomem __force *)kmap(pfn_to_page(pfn));
345 } else
346 return acpi_os_ioremap(pg_off, pg_sz);
347 }
348
349 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
350 {
351 unsigned long pfn;
352
353 pfn = pg_off >> PAGE_SHIFT;
354 if (should_use_kmap(pfn))
355 kunmap(pfn_to_page(pfn));
356 else
357 iounmap(vaddr);
358 }
359
360 void __iomem *__init_refok
361 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
362 {
363 struct acpi_ioremap *map;
364 void __iomem *virt;
365 acpi_physical_address pg_off;
366 acpi_size pg_sz;
367
368 if (phys > ULONG_MAX) {
369 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
370 return NULL;
371 }
372
373 if (!acpi_gbl_permanent_mmap)
374 return __acpi_map_table((unsigned long)phys, size);
375
376 mutex_lock(&acpi_ioremap_lock);
377 /* Check if there's a suitable mapping already. */
378 map = acpi_map_lookup(phys, size);
379 if (map) {
380 map->refcount++;
381 goto out;
382 }
383
384 map = kzalloc(sizeof(*map), GFP_KERNEL);
385 if (!map) {
386 mutex_unlock(&acpi_ioremap_lock);
387 return NULL;
388 }
389
390 pg_off = round_down(phys, PAGE_SIZE);
391 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
392 virt = acpi_map(pg_off, pg_sz);
393 if (!virt) {
394 mutex_unlock(&acpi_ioremap_lock);
395 kfree(map);
396 return NULL;
397 }
398
399 INIT_LIST_HEAD(&map->list);
400 map->virt = virt;
401 map->phys = pg_off;
402 map->size = pg_sz;
403 map->refcount = 1;
404
405 list_add_tail_rcu(&map->list, &acpi_ioremaps);
406
407 out:
408 mutex_unlock(&acpi_ioremap_lock);
409 return map->virt + (phys - map->phys);
410 }
411 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
412
413 void *__init_refok
414 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
415 {
416 return (void *)acpi_os_map_iomem(phys, size);
417 }
418 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
419
420 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
421 {
422 if (!--map->refcount)
423 list_del_rcu(&map->list);
424 }
425
426 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
427 {
428 if (!map->refcount) {
429 synchronize_rcu();
430 acpi_unmap(map->phys, map->virt);
431 kfree(map);
432 }
433 }
434
435 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
436 {
437 struct acpi_ioremap *map;
438
439 if (!acpi_gbl_permanent_mmap) {
440 __acpi_unmap_table(virt, size);
441 return;
442 }
443
444 mutex_lock(&acpi_ioremap_lock);
445 map = acpi_map_lookup_virt(virt, size);
446 if (!map) {
447 mutex_unlock(&acpi_ioremap_lock);
448 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
449 return;
450 }
451 acpi_os_drop_map_ref(map);
452 mutex_unlock(&acpi_ioremap_lock);
453
454 acpi_os_map_cleanup(map);
455 }
456 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
457
458 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
459 {
460 return acpi_os_unmap_iomem((void __iomem *)virt, size);
461 }
462 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
463
464 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
465 {
466 if (!acpi_gbl_permanent_mmap)
467 __acpi_unmap_table(virt, size);
468 }
469
470 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
471 {
472 u64 addr;
473 void __iomem *virt;
474
475 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
476 return 0;
477
478 /* Handle possible alignment issues */
479 memcpy(&addr, &gas->address, sizeof(addr));
480 if (!addr || !gas->bit_width)
481 return -EINVAL;
482
483 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
484 if (!virt)
485 return -EIO;
486
487 return 0;
488 }
489 EXPORT_SYMBOL(acpi_os_map_generic_address);
490
491 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
492 {
493 u64 addr;
494 struct acpi_ioremap *map;
495
496 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
497 return;
498
499 /* Handle possible alignment issues */
500 memcpy(&addr, &gas->address, sizeof(addr));
501 if (!addr || !gas->bit_width)
502 return;
503
504 mutex_lock(&acpi_ioremap_lock);
505 map = acpi_map_lookup(addr, gas->bit_width / 8);
506 if (!map) {
507 mutex_unlock(&acpi_ioremap_lock);
508 return;
509 }
510 acpi_os_drop_map_ref(map);
511 mutex_unlock(&acpi_ioremap_lock);
512
513 acpi_os_map_cleanup(map);
514 }
515 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
516
517 #ifdef ACPI_FUTURE_USAGE
518 acpi_status
519 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
520 {
521 if (!phys || !virt)
522 return AE_BAD_PARAMETER;
523
524 *phys = virt_to_phys(virt);
525
526 return AE_OK;
527 }
528 #endif
529
530 #define ACPI_MAX_OVERRIDE_LEN 100
531
532 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
533
534 acpi_status
535 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
536 acpi_string * new_val)
537 {
538 if (!init_val || !new_val)
539 return AE_BAD_PARAMETER;
540
541 *new_val = NULL;
542 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
543 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
544 acpi_os_name);
545 *new_val = acpi_os_name;
546 }
547
548 return AE_OK;
549 }
550
551 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
552 #include <linux/earlycpio.h>
553 #include <linux/memblock.h>
554
555 static u64 acpi_tables_addr;
556 static int all_tables_size;
557
558 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
559 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
560 {
561 u8 sum = 0;
562 u8 *end = buffer + length;
563
564 while (buffer < end)
565 sum = (u8) (sum + *(buffer++));
566 return sum;
567 }
568
569 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
570 static const char * const table_sigs[] = {
571 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
572 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
573 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
574 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
575 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
576 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
577 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
578 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
579 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
580
581 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
582
583 #define ACPI_OVERRIDE_TABLES 64
584 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
585
586 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
587
588 void __init acpi_initrd_override(void *data, size_t size)
589 {
590 int sig, no, table_nr = 0, total_offset = 0;
591 long offset = 0;
592 struct acpi_table_header *table;
593 char cpio_path[32] = "kernel/firmware/acpi/";
594 struct cpio_data file;
595
596 if (data == NULL || size == 0)
597 return;
598
599 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
600 file = find_cpio_data(cpio_path, data, size, &offset);
601 if (!file.data)
602 break;
603
604 data += offset;
605 size -= offset;
606
607 if (file.size < sizeof(struct acpi_table_header)) {
608 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
609 cpio_path, file.name);
610 continue;
611 }
612
613 table = file.data;
614
615 for (sig = 0; table_sigs[sig]; sig++)
616 if (!memcmp(table->signature, table_sigs[sig], 4))
617 break;
618
619 if (!table_sigs[sig]) {
620 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
621 cpio_path, file.name);
622 continue;
623 }
624 if (file.size != table->length) {
625 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
626 cpio_path, file.name);
627 continue;
628 }
629 if (acpi_table_checksum(file.data, table->length)) {
630 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
631 cpio_path, file.name);
632 continue;
633 }
634
635 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
636 table->signature, cpio_path, file.name, table->length);
637
638 all_tables_size += table->length;
639 acpi_initrd_files[table_nr].data = file.data;
640 acpi_initrd_files[table_nr].size = file.size;
641 table_nr++;
642 }
643 if (table_nr == 0)
644 return;
645
646 acpi_tables_addr =
647 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
648 all_tables_size, PAGE_SIZE);
649 if (!acpi_tables_addr) {
650 WARN_ON(1);
651 return;
652 }
653 /*
654 * Only calling e820_add_reserve does not work and the
655 * tables are invalid (memory got used) later.
656 * memblock_reserve works as expected and the tables won't get modified.
657 * But it's not enough on X86 because ioremap will
658 * complain later (used by acpi_os_map_memory) that the pages
659 * that should get mapped are not marked "reserved".
660 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
661 * works fine.
662 */
663 memblock_reserve(acpi_tables_addr, all_tables_size);
664 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
665
666 /*
667 * early_ioremap only can remap 256k one time. If we map all
668 * tables one time, we will hit the limit. Need to map chunks
669 * one by one during copying the same as that in relocate_initrd().
670 */
671 for (no = 0; no < table_nr; no++) {
672 unsigned char *src_p = acpi_initrd_files[no].data;
673 phys_addr_t size = acpi_initrd_files[no].size;
674 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
675 phys_addr_t slop, clen;
676 char *dest_p;
677
678 total_offset += size;
679
680 while (size) {
681 slop = dest_addr & ~PAGE_MASK;
682 clen = size;
683 if (clen > MAP_CHUNK_SIZE - slop)
684 clen = MAP_CHUNK_SIZE - slop;
685 dest_p = early_ioremap(dest_addr & PAGE_MASK,
686 clen + slop);
687 memcpy(dest_p + slop, src_p, clen);
688 early_iounmap(dest_p, clen + slop);
689 src_p += clen;
690 dest_addr += clen;
691 size -= clen;
692 }
693 }
694 }
695 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
696
697 static void acpi_table_taint(struct acpi_table_header *table)
698 {
699 pr_warn(PREFIX
700 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
701 table->signature, table->oem_table_id);
702 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
703 }
704
705
706 acpi_status
707 acpi_os_table_override(struct acpi_table_header * existing_table,
708 struct acpi_table_header ** new_table)
709 {
710 if (!existing_table || !new_table)
711 return AE_BAD_PARAMETER;
712
713 *new_table = NULL;
714
715 #ifdef CONFIG_ACPI_CUSTOM_DSDT
716 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
717 *new_table = (struct acpi_table_header *)AmlCode;
718 #endif
719 if (*new_table != NULL)
720 acpi_table_taint(existing_table);
721 return AE_OK;
722 }
723
724 acpi_status
725 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
726 acpi_physical_address *address,
727 u32 *table_length)
728 {
729 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
730 *table_length = 0;
731 *address = 0;
732 return AE_OK;
733 #else
734 int table_offset = 0;
735 struct acpi_table_header *table;
736
737 *table_length = 0;
738 *address = 0;
739
740 if (!acpi_tables_addr)
741 return AE_OK;
742
743 do {
744 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
745 WARN_ON(1);
746 return AE_OK;
747 }
748
749 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
750 ACPI_HEADER_SIZE);
751
752 if (table_offset + table->length > all_tables_size) {
753 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
754 WARN_ON(1);
755 return AE_OK;
756 }
757
758 table_offset += table->length;
759
760 if (memcmp(existing_table->signature, table->signature, 4)) {
761 acpi_os_unmap_memory(table,
762 ACPI_HEADER_SIZE);
763 continue;
764 }
765
766 /* Only override tables with matching oem id */
767 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
768 ACPI_OEM_TABLE_ID_SIZE)) {
769 acpi_os_unmap_memory(table,
770 ACPI_HEADER_SIZE);
771 continue;
772 }
773
774 table_offset -= table->length;
775 *table_length = table->length;
776 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
777 *address = acpi_tables_addr + table_offset;
778 break;
779 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
780
781 if (*address != 0)
782 acpi_table_taint(existing_table);
783 return AE_OK;
784 #endif
785 }
786
787 static irqreturn_t acpi_irq(int irq, void *dev_id)
788 {
789 u32 handled;
790
791 handled = (*acpi_irq_handler) (acpi_irq_context);
792
793 if (handled) {
794 acpi_irq_handled++;
795 return IRQ_HANDLED;
796 } else {
797 acpi_irq_not_handled++;
798 return IRQ_NONE;
799 }
800 }
801
802 acpi_status
803 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
804 void *context)
805 {
806 unsigned int irq;
807
808 acpi_irq_stats_init();
809
810 /*
811 * ACPI interrupts different from the SCI in our copy of the FADT are
812 * not supported.
813 */
814 if (gsi != acpi_gbl_FADT.sci_interrupt)
815 return AE_BAD_PARAMETER;
816
817 if (acpi_irq_handler)
818 return AE_ALREADY_ACQUIRED;
819
820 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
821 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
822 gsi);
823 return AE_OK;
824 }
825
826 acpi_irq_handler = handler;
827 acpi_irq_context = context;
828 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
829 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
830 acpi_irq_handler = NULL;
831 return AE_NOT_ACQUIRED;
832 }
833
834 return AE_OK;
835 }
836
837 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
838 {
839 if (irq != acpi_gbl_FADT.sci_interrupt)
840 return AE_BAD_PARAMETER;
841
842 free_irq(irq, acpi_irq);
843 acpi_irq_handler = NULL;
844
845 return AE_OK;
846 }
847
848 /*
849 * Running in interpreter thread context, safe to sleep
850 */
851
852 void acpi_os_sleep(u64 ms)
853 {
854 msleep(ms);
855 }
856
857 void acpi_os_stall(u32 us)
858 {
859 while (us) {
860 u32 delay = 1000;
861
862 if (delay > us)
863 delay = us;
864 udelay(delay);
865 touch_nmi_watchdog();
866 us -= delay;
867 }
868 }
869
870 /*
871 * Support ACPI 3.0 AML Timer operand
872 * Returns 64-bit free-running, monotonically increasing timer
873 * with 100ns granularity
874 */
875 u64 acpi_os_get_timer(void)
876 {
877 u64 time_ns = ktime_to_ns(ktime_get());
878 do_div(time_ns, 100);
879 return time_ns;
880 }
881
882 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
883 {
884 u32 dummy;
885
886 if (!value)
887 value = &dummy;
888
889 *value = 0;
890 if (width <= 8) {
891 *(u8 *) value = inb(port);
892 } else if (width <= 16) {
893 *(u16 *) value = inw(port);
894 } else if (width <= 32) {
895 *(u32 *) value = inl(port);
896 } else {
897 BUG();
898 }
899
900 return AE_OK;
901 }
902
903 EXPORT_SYMBOL(acpi_os_read_port);
904
905 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
906 {
907 if (width <= 8) {
908 outb(value, port);
909 } else if (width <= 16) {
910 outw(value, port);
911 } else if (width <= 32) {
912 outl(value, port);
913 } else {
914 BUG();
915 }
916
917 return AE_OK;
918 }
919
920 EXPORT_SYMBOL(acpi_os_write_port);
921
922 #ifdef readq
923 static inline u64 read64(const volatile void __iomem *addr)
924 {
925 return readq(addr);
926 }
927 #else
928 static inline u64 read64(const volatile void __iomem *addr)
929 {
930 u64 l, h;
931 l = readl(addr);
932 h = readl(addr+4);
933 return l | (h << 32);
934 }
935 #endif
936
937 acpi_status
938 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
939 {
940 void __iomem *virt_addr;
941 unsigned int size = width / 8;
942 bool unmap = false;
943 u64 dummy;
944
945 rcu_read_lock();
946 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
947 if (!virt_addr) {
948 rcu_read_unlock();
949 virt_addr = acpi_os_ioremap(phys_addr, size);
950 if (!virt_addr)
951 return AE_BAD_ADDRESS;
952 unmap = true;
953 }
954
955 if (!value)
956 value = &dummy;
957
958 switch (width) {
959 case 8:
960 *(u8 *) value = readb(virt_addr);
961 break;
962 case 16:
963 *(u16 *) value = readw(virt_addr);
964 break;
965 case 32:
966 *(u32 *) value = readl(virt_addr);
967 break;
968 case 64:
969 *(u64 *) value = read64(virt_addr);
970 break;
971 default:
972 BUG();
973 }
974
975 if (unmap)
976 iounmap(virt_addr);
977 else
978 rcu_read_unlock();
979
980 return AE_OK;
981 }
982
983 #ifdef writeq
984 static inline void write64(u64 val, volatile void __iomem *addr)
985 {
986 writeq(val, addr);
987 }
988 #else
989 static inline void write64(u64 val, volatile void __iomem *addr)
990 {
991 writel(val, addr);
992 writel(val>>32, addr+4);
993 }
994 #endif
995
996 acpi_status
997 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
998 {
999 void __iomem *virt_addr;
1000 unsigned int size = width / 8;
1001 bool unmap = false;
1002
1003 rcu_read_lock();
1004 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1005 if (!virt_addr) {
1006 rcu_read_unlock();
1007 virt_addr = acpi_os_ioremap(phys_addr, size);
1008 if (!virt_addr)
1009 return AE_BAD_ADDRESS;
1010 unmap = true;
1011 }
1012
1013 switch (width) {
1014 case 8:
1015 writeb(value, virt_addr);
1016 break;
1017 case 16:
1018 writew(value, virt_addr);
1019 break;
1020 case 32:
1021 writel(value, virt_addr);
1022 break;
1023 case 64:
1024 write64(value, virt_addr);
1025 break;
1026 default:
1027 BUG();
1028 }
1029
1030 if (unmap)
1031 iounmap(virt_addr);
1032 else
1033 rcu_read_unlock();
1034
1035 return AE_OK;
1036 }
1037
1038 acpi_status
1039 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1040 u64 *value, u32 width)
1041 {
1042 int result, size;
1043 u32 value32;
1044
1045 if (!value)
1046 return AE_BAD_PARAMETER;
1047
1048 switch (width) {
1049 case 8:
1050 size = 1;
1051 break;
1052 case 16:
1053 size = 2;
1054 break;
1055 case 32:
1056 size = 4;
1057 break;
1058 default:
1059 return AE_ERROR;
1060 }
1061
1062 result = raw_pci_read(pci_id->segment, pci_id->bus,
1063 PCI_DEVFN(pci_id->device, pci_id->function),
1064 reg, size, &value32);
1065 *value = value32;
1066
1067 return (result ? AE_ERROR : AE_OK);
1068 }
1069
1070 acpi_status
1071 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1072 u64 value, u32 width)
1073 {
1074 int result, size;
1075
1076 switch (width) {
1077 case 8:
1078 size = 1;
1079 break;
1080 case 16:
1081 size = 2;
1082 break;
1083 case 32:
1084 size = 4;
1085 break;
1086 default:
1087 return AE_ERROR;
1088 }
1089
1090 result = raw_pci_write(pci_id->segment, pci_id->bus,
1091 PCI_DEVFN(pci_id->device, pci_id->function),
1092 reg, size, value);
1093
1094 return (result ? AE_ERROR : AE_OK);
1095 }
1096
1097 static void acpi_os_execute_deferred(struct work_struct *work)
1098 {
1099 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1100
1101 dpc->function(dpc->context);
1102 kfree(dpc);
1103 }
1104
1105 /*******************************************************************************
1106 *
1107 * FUNCTION: acpi_os_execute
1108 *
1109 * PARAMETERS: Type - Type of the callback
1110 * Function - Function to be executed
1111 * Context - Function parameters
1112 *
1113 * RETURN: Status
1114 *
1115 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1116 * immediately executes function on a separate thread.
1117 *
1118 ******************************************************************************/
1119
1120 acpi_status acpi_os_execute(acpi_execute_type type,
1121 acpi_osd_exec_callback function, void *context)
1122 {
1123 acpi_status status = AE_OK;
1124 struct acpi_os_dpc *dpc;
1125 struct workqueue_struct *queue;
1126 int ret;
1127 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1128 "Scheduling function [%p(%p)] for deferred execution.\n",
1129 function, context));
1130
1131 /*
1132 * Allocate/initialize DPC structure. Note that this memory will be
1133 * freed by the callee. The kernel handles the work_struct list in a
1134 * way that allows us to also free its memory inside the callee.
1135 * Because we may want to schedule several tasks with different
1136 * parameters we can't use the approach some kernel code uses of
1137 * having a static work_struct.
1138 */
1139
1140 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1141 if (!dpc)
1142 return AE_NO_MEMORY;
1143
1144 dpc->function = function;
1145 dpc->context = context;
1146
1147 /*
1148 * To prevent lockdep from complaining unnecessarily, make sure that
1149 * there is a different static lockdep key for each workqueue by using
1150 * INIT_WORK() for each of them separately.
1151 */
1152 if (type == OSL_NOTIFY_HANDLER) {
1153 queue = kacpi_notify_wq;
1154 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1155 } else {
1156 queue = kacpid_wq;
1157 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1158 }
1159
1160 /*
1161 * On some machines, a software-initiated SMI causes corruption unless
1162 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1163 * typically it's done in GPE-related methods that are run via
1164 * workqueues, so we can avoid the known corruption cases by always
1165 * queueing on CPU 0.
1166 */
1167 ret = queue_work_on(0, queue, &dpc->work);
1168
1169 if (!ret) {
1170 printk(KERN_ERR PREFIX
1171 "Call to queue_work() failed.\n");
1172 status = AE_ERROR;
1173 kfree(dpc);
1174 }
1175 return status;
1176 }
1177 EXPORT_SYMBOL(acpi_os_execute);
1178
1179 void acpi_os_wait_events_complete(void)
1180 {
1181 flush_workqueue(kacpid_wq);
1182 flush_workqueue(kacpi_notify_wq);
1183 }
1184
1185 struct acpi_hp_work {
1186 struct work_struct work;
1187 struct acpi_device *adev;
1188 u32 src;
1189 };
1190
1191 static void acpi_hotplug_work_fn(struct work_struct *work)
1192 {
1193 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1194
1195 acpi_os_wait_events_complete();
1196 acpi_device_hotplug(hpw->adev, hpw->src);
1197 kfree(hpw);
1198 }
1199
1200 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1201 {
1202 struct acpi_hp_work *hpw;
1203
1204 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1205 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1206 adev, src));
1207
1208 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1209 if (!hpw)
1210 return AE_NO_MEMORY;
1211
1212 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1213 hpw->adev = adev;
1214 hpw->src = src;
1215 /*
1216 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1217 * the hotplug code may call driver .remove() functions, which may
1218 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1219 * these workqueues.
1220 */
1221 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1222 kfree(hpw);
1223 return AE_ERROR;
1224 }
1225 return AE_OK;
1226 }
1227
1228 bool acpi_queue_hotplug_work(struct work_struct *work)
1229 {
1230 return queue_work(kacpi_hotplug_wq, work);
1231 }
1232
1233 acpi_status
1234 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1235 {
1236 struct semaphore *sem = NULL;
1237
1238 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1239 if (!sem)
1240 return AE_NO_MEMORY;
1241
1242 sema_init(sem, initial_units);
1243
1244 *handle = (acpi_handle *) sem;
1245
1246 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1247 *handle, initial_units));
1248
1249 return AE_OK;
1250 }
1251
1252 /*
1253 * TODO: A better way to delete semaphores? Linux doesn't have a
1254 * 'delete_semaphore()' function -- may result in an invalid
1255 * pointer dereference for non-synchronized consumers. Should
1256 * we at least check for blocked threads and signal/cancel them?
1257 */
1258
1259 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1260 {
1261 struct semaphore *sem = (struct semaphore *)handle;
1262
1263 if (!sem)
1264 return AE_BAD_PARAMETER;
1265
1266 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1267
1268 BUG_ON(!list_empty(&sem->wait_list));
1269 kfree(sem);
1270 sem = NULL;
1271
1272 return AE_OK;
1273 }
1274
1275 /*
1276 * TODO: Support for units > 1?
1277 */
1278 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1279 {
1280 acpi_status status = AE_OK;
1281 struct semaphore *sem = (struct semaphore *)handle;
1282 long jiffies;
1283 int ret = 0;
1284
1285 if (!sem || (units < 1))
1286 return AE_BAD_PARAMETER;
1287
1288 if (units > 1)
1289 return AE_SUPPORT;
1290
1291 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1292 handle, units, timeout));
1293
1294 if (timeout == ACPI_WAIT_FOREVER)
1295 jiffies = MAX_SCHEDULE_TIMEOUT;
1296 else
1297 jiffies = msecs_to_jiffies(timeout);
1298
1299 ret = down_timeout(sem, jiffies);
1300 if (ret)
1301 status = AE_TIME;
1302
1303 if (ACPI_FAILURE(status)) {
1304 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1305 "Failed to acquire semaphore[%p|%d|%d], %s",
1306 handle, units, timeout,
1307 acpi_format_exception(status)));
1308 } else {
1309 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1310 "Acquired semaphore[%p|%d|%d]", handle,
1311 units, timeout));
1312 }
1313
1314 return status;
1315 }
1316
1317 /*
1318 * TODO: Support for units > 1?
1319 */
1320 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1321 {
1322 struct semaphore *sem = (struct semaphore *)handle;
1323
1324 if (!sem || (units < 1))
1325 return AE_BAD_PARAMETER;
1326
1327 if (units > 1)
1328 return AE_SUPPORT;
1329
1330 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1331 units));
1332
1333 up(sem);
1334
1335 return AE_OK;
1336 }
1337
1338 #ifdef ACPI_FUTURE_USAGE
1339 u32 acpi_os_get_line(char *buffer)
1340 {
1341
1342 #ifdef ENABLE_DEBUGGER
1343 if (acpi_in_debugger) {
1344 u32 chars;
1345
1346 kdb_read(buffer, sizeof(line_buf));
1347
1348 /* remove the CR kdb includes */
1349 chars = strlen(buffer) - 1;
1350 buffer[chars] = '\0';
1351 }
1352 #endif
1353
1354 return 0;
1355 }
1356 #endif /* ACPI_FUTURE_USAGE */
1357
1358 acpi_status acpi_os_signal(u32 function, void *info)
1359 {
1360 switch (function) {
1361 case ACPI_SIGNAL_FATAL:
1362 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1363 break;
1364 case ACPI_SIGNAL_BREAKPOINT:
1365 /*
1366 * AML Breakpoint
1367 * ACPI spec. says to treat it as a NOP unless
1368 * you are debugging. So if/when we integrate
1369 * AML debugger into the kernel debugger its
1370 * hook will go here. But until then it is
1371 * not useful to print anything on breakpoints.
1372 */
1373 break;
1374 default:
1375 break;
1376 }
1377
1378 return AE_OK;
1379 }
1380
1381 static int __init acpi_os_name_setup(char *str)
1382 {
1383 char *p = acpi_os_name;
1384 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1385
1386 if (!str || !*str)
1387 return 0;
1388
1389 for (; count-- && *str; str++) {
1390 if (isalnum(*str) || *str == ' ' || *str == ':')
1391 *p++ = *str;
1392 else if (*str == '\'' || *str == '"')
1393 continue;
1394 else
1395 break;
1396 }
1397 *p = 0;
1398
1399 return 1;
1400
1401 }
1402
1403 __setup("acpi_os_name=", acpi_os_name_setup);
1404
1405 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1406 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1407
1408 struct osi_setup_entry {
1409 char string[OSI_STRING_LENGTH_MAX];
1410 bool enable;
1411 };
1412
1413 static struct osi_setup_entry
1414 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1415 {"Module Device", true},
1416 {"Processor Device", true},
1417 {"3.0 _SCP Extensions", true},
1418 {"Processor Aggregator Device", true},
1419 };
1420
1421 void __init acpi_osi_setup(char *str)
1422 {
1423 struct osi_setup_entry *osi;
1424 bool enable = true;
1425 int i;
1426
1427 if (!acpi_gbl_create_osi_method)
1428 return;
1429
1430 if (str == NULL || *str == '\0') {
1431 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1432 acpi_gbl_create_osi_method = FALSE;
1433 return;
1434 }
1435
1436 if (*str == '!') {
1437 str++;
1438 if (*str == '\0') {
1439 osi_linux.default_disabling = 1;
1440 return;
1441 } else if (*str == '*') {
1442 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1443 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1444 osi = &osi_setup_entries[i];
1445 osi->enable = false;
1446 }
1447 return;
1448 }
1449 enable = false;
1450 }
1451
1452 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1453 osi = &osi_setup_entries[i];
1454 if (!strcmp(osi->string, str)) {
1455 osi->enable = enable;
1456 break;
1457 } else if (osi->string[0] == '\0') {
1458 osi->enable = enable;
1459 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1460 break;
1461 }
1462 }
1463 }
1464
1465 static void __init set_osi_linux(unsigned int enable)
1466 {
1467 if (osi_linux.enable != enable)
1468 osi_linux.enable = enable;
1469
1470 if (osi_linux.enable)
1471 acpi_osi_setup("Linux");
1472 else
1473 acpi_osi_setup("!Linux");
1474
1475 return;
1476 }
1477
1478 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1479 {
1480 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1481 osi_linux.dmi = 0;
1482 set_osi_linux(enable);
1483
1484 return;
1485 }
1486
1487 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1488 {
1489 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1490
1491 if (enable == -1)
1492 return;
1493
1494 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1495 set_osi_linux(enable);
1496
1497 return;
1498 }
1499
1500 /*
1501 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1502 *
1503 * empty string disables _OSI
1504 * string starting with '!' disables that string
1505 * otherwise string is added to list, augmenting built-in strings
1506 */
1507 static void __init acpi_osi_setup_late(void)
1508 {
1509 struct osi_setup_entry *osi;
1510 char *str;
1511 int i;
1512 acpi_status status;
1513
1514 if (osi_linux.default_disabling) {
1515 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1516
1517 if (ACPI_SUCCESS(status))
1518 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1519 }
1520
1521 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1522 osi = &osi_setup_entries[i];
1523 str = osi->string;
1524
1525 if (*str == '\0')
1526 break;
1527 if (osi->enable) {
1528 status = acpi_install_interface(str);
1529
1530 if (ACPI_SUCCESS(status))
1531 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1532 } else {
1533 status = acpi_remove_interface(str);
1534
1535 if (ACPI_SUCCESS(status))
1536 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1537 }
1538 }
1539 }
1540
1541 static int __init osi_setup(char *str)
1542 {
1543 if (str && !strcmp("Linux", str))
1544 acpi_cmdline_osi_linux(1);
1545 else if (str && !strcmp("!Linux", str))
1546 acpi_cmdline_osi_linux(0);
1547 else
1548 acpi_osi_setup(str);
1549
1550 return 1;
1551 }
1552
1553 __setup("acpi_osi=", osi_setup);
1554
1555 /*
1556 * Disable the auto-serialization of named objects creation methods.
1557 *
1558 * This feature is enabled by default. It marks the AML control methods
1559 * that contain the opcodes to create named objects as "Serialized".
1560 */
1561 static int __init acpi_no_auto_serialize_setup(char *str)
1562 {
1563 acpi_gbl_auto_serialize_methods = FALSE;
1564 pr_info("ACPI: auto-serialization disabled\n");
1565
1566 return 1;
1567 }
1568
1569 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1570
1571 /* Check of resource interference between native drivers and ACPI
1572 * OperationRegions (SystemIO and System Memory only).
1573 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1574 * in arbitrary AML code and can interfere with legacy drivers.
1575 * acpi_enforce_resources= can be set to:
1576 *
1577 * - strict (default) (2)
1578 * -> further driver trying to access the resources will not load
1579 * - lax (1)
1580 * -> further driver trying to access the resources will load, but you
1581 * get a system message that something might go wrong...
1582 *
1583 * - no (0)
1584 * -> ACPI Operation Region resources will not be registered
1585 *
1586 */
1587 #define ENFORCE_RESOURCES_STRICT 2
1588 #define ENFORCE_RESOURCES_LAX 1
1589 #define ENFORCE_RESOURCES_NO 0
1590
1591 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1592
1593 static int __init acpi_enforce_resources_setup(char *str)
1594 {
1595 if (str == NULL || *str == '\0')
1596 return 0;
1597
1598 if (!strcmp("strict", str))
1599 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1600 else if (!strcmp("lax", str))
1601 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1602 else if (!strcmp("no", str))
1603 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1604
1605 return 1;
1606 }
1607
1608 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1609
1610 /* Check for resource conflicts between ACPI OperationRegions and native
1611 * drivers */
1612 int acpi_check_resource_conflict(const struct resource *res)
1613 {
1614 acpi_adr_space_type space_id;
1615 acpi_size length;
1616 u8 warn = 0;
1617 int clash = 0;
1618
1619 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1620 return 0;
1621 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1622 return 0;
1623
1624 if (res->flags & IORESOURCE_IO)
1625 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1626 else
1627 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1628
1629 length = resource_size(res);
1630 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1631 warn = 1;
1632 clash = acpi_check_address_range(space_id, res->start, length, warn);
1633
1634 if (clash) {
1635 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1636 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1637 printk(KERN_NOTICE "ACPI: This conflict may"
1638 " cause random problems and system"
1639 " instability\n");
1640 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1641 " for this device, you should use it instead of"
1642 " the native driver\n");
1643 }
1644 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1645 return -EBUSY;
1646 }
1647 return 0;
1648 }
1649 EXPORT_SYMBOL(acpi_check_resource_conflict);
1650
1651 int acpi_check_region(resource_size_t start, resource_size_t n,
1652 const char *name)
1653 {
1654 struct resource res = {
1655 .start = start,
1656 .end = start + n - 1,
1657 .name = name,
1658 .flags = IORESOURCE_IO,
1659 };
1660
1661 return acpi_check_resource_conflict(&res);
1662 }
1663 EXPORT_SYMBOL(acpi_check_region);
1664
1665 /*
1666 * Let drivers know whether the resource checks are effective
1667 */
1668 int acpi_resources_are_enforced(void)
1669 {
1670 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1671 }
1672 EXPORT_SYMBOL(acpi_resources_are_enforced);
1673
1674 /*
1675 * Deallocate the memory for a spinlock.
1676 */
1677 void acpi_os_delete_lock(acpi_spinlock handle)
1678 {
1679 ACPI_FREE(handle);
1680 }
1681
1682 /*
1683 * Acquire a spinlock.
1684 *
1685 * handle is a pointer to the spinlock_t.
1686 */
1687
1688 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1689 {
1690 acpi_cpu_flags flags;
1691 spin_lock_irqsave(lockp, flags);
1692 return flags;
1693 }
1694
1695 /*
1696 * Release a spinlock. See above.
1697 */
1698
1699 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1700 {
1701 spin_unlock_irqrestore(lockp, flags);
1702 }
1703
1704 #ifndef ACPI_USE_LOCAL_CACHE
1705
1706 /*******************************************************************************
1707 *
1708 * FUNCTION: acpi_os_create_cache
1709 *
1710 * PARAMETERS: name - Ascii name for the cache
1711 * size - Size of each cached object
1712 * depth - Maximum depth of the cache (in objects) <ignored>
1713 * cache - Where the new cache object is returned
1714 *
1715 * RETURN: status
1716 *
1717 * DESCRIPTION: Create a cache object
1718 *
1719 ******************************************************************************/
1720
1721 acpi_status
1722 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1723 {
1724 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1725 if (*cache == NULL)
1726 return AE_ERROR;
1727 else
1728 return AE_OK;
1729 }
1730
1731 /*******************************************************************************
1732 *
1733 * FUNCTION: acpi_os_purge_cache
1734 *
1735 * PARAMETERS: Cache - Handle to cache object
1736 *
1737 * RETURN: Status
1738 *
1739 * DESCRIPTION: Free all objects within the requested cache.
1740 *
1741 ******************************************************************************/
1742
1743 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1744 {
1745 kmem_cache_shrink(cache);
1746 return (AE_OK);
1747 }
1748
1749 /*******************************************************************************
1750 *
1751 * FUNCTION: acpi_os_delete_cache
1752 *
1753 * PARAMETERS: Cache - Handle to cache object
1754 *
1755 * RETURN: Status
1756 *
1757 * DESCRIPTION: Free all objects within the requested cache and delete the
1758 * cache object.
1759 *
1760 ******************************************************************************/
1761
1762 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1763 {
1764 kmem_cache_destroy(cache);
1765 return (AE_OK);
1766 }
1767
1768 /*******************************************************************************
1769 *
1770 * FUNCTION: acpi_os_release_object
1771 *
1772 * PARAMETERS: Cache - Handle to cache object
1773 * Object - The object to be released
1774 *
1775 * RETURN: None
1776 *
1777 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1778 * the object is deleted.
1779 *
1780 ******************************************************************************/
1781
1782 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1783 {
1784 kmem_cache_free(cache, object);
1785 return (AE_OK);
1786 }
1787 #endif
1788
1789 static int __init acpi_no_static_ssdt_setup(char *s)
1790 {
1791 acpi_gbl_disable_ssdt_table_install = TRUE;
1792 pr_info("ACPI: static SSDT installation disabled\n");
1793
1794 return 0;
1795 }
1796
1797 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1798
1799 static int __init acpi_disable_return_repair(char *s)
1800 {
1801 printk(KERN_NOTICE PREFIX
1802 "ACPI: Predefined validation mechanism disabled\n");
1803 acpi_gbl_disable_auto_repair = TRUE;
1804
1805 return 1;
1806 }
1807
1808 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1809
1810 acpi_status __init acpi_os_initialize(void)
1811 {
1812 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1813 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1814 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1815 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1816 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1817 /*
1818 * Use acpi_os_map_generic_address to pre-map the reset
1819 * register if it's in system memory.
1820 */
1821 int rv;
1822
1823 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1824 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1825 }
1826
1827 return AE_OK;
1828 }
1829
1830 acpi_status __init acpi_os_initialize1(void)
1831 {
1832 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1833 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1834 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1835 BUG_ON(!kacpid_wq);
1836 BUG_ON(!kacpi_notify_wq);
1837 BUG_ON(!kacpi_hotplug_wq);
1838 acpi_install_interface_handler(acpi_osi_handler);
1839 acpi_osi_setup_late();
1840 return AE_OK;
1841 }
1842
1843 acpi_status acpi_os_terminate(void)
1844 {
1845 if (acpi_irq_handler) {
1846 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1847 acpi_irq_handler);
1848 }
1849
1850 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1851 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1852 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1853 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1854 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1855 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1856
1857 destroy_workqueue(kacpid_wq);
1858 destroy_workqueue(kacpi_notify_wq);
1859 destroy_workqueue(kacpi_hotplug_wq);
1860
1861 return AE_OK;
1862 }
1863
1864 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1865 u32 pm1b_control)
1866 {
1867 int rc = 0;
1868 if (__acpi_os_prepare_sleep)
1869 rc = __acpi_os_prepare_sleep(sleep_state,
1870 pm1a_control, pm1b_control);
1871 if (rc < 0)
1872 return AE_ERROR;
1873 else if (rc > 0)
1874 return AE_CTRL_SKIP;
1875
1876 return AE_OK;
1877 }
1878
1879 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1880 u32 pm1a_ctrl, u32 pm1b_ctrl))
1881 {
1882 __acpi_os_prepare_sleep = func;
1883 }
1884
1885 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1886 u32 val_b)
1887 {
1888 int rc = 0;
1889 if (__acpi_os_prepare_extended_sleep)
1890 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1891 val_a, val_b);
1892 if (rc < 0)
1893 return AE_ERROR;
1894 else if (rc > 0)
1895 return AE_CTRL_SKIP;
1896
1897 return AE_OK;
1898 }
1899
1900 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1901 u32 val_a, u32 val_b))
1902 {
1903 __acpi_os_prepare_extended_sleep = func;
1904 }
Linux kernel - Deliverables
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