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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty...
[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 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 void __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
216 void acpi_os_printf(const char *fmt, ...)
217 {
218 va_list args;
219 va_start(args, fmt);
220 acpi_os_vprintf(fmt, args);
221 va_end(args);
222 }
223
224 void acpi_os_vprintf(const char *fmt, va_list args)
225 {
226 static char buffer[512];
227
228 vsprintf(buffer, fmt, args);
229
230 #ifdef ENABLE_DEBUGGER
231 if (acpi_in_debugger) {
232 kdb_printf("%s", buffer);
233 } else {
234 printk(KERN_CONT "%s", buffer);
235 }
236 #else
237 printk(KERN_CONT "%s", buffer);
238 #endif
239 }
240
241 #ifdef CONFIG_KEXEC
242 static unsigned long acpi_rsdp;
243 static int __init setup_acpi_rsdp(char *arg)
244 {
245 if (kstrtoul(arg, 16, &acpi_rsdp))
246 return -EINVAL;
247 return 0;
248 }
249 early_param("acpi_rsdp", setup_acpi_rsdp);
250 #endif
251
252 acpi_physical_address __init acpi_os_get_root_pointer(void)
253 {
254 #ifdef CONFIG_KEXEC
255 if (acpi_rsdp)
256 return acpi_rsdp;
257 #endif
258
259 if (efi_enabled(EFI_CONFIG_TABLES)) {
260 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
261 return efi.acpi20;
262 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
263 return efi.acpi;
264 else {
265 printk(KERN_ERR PREFIX
266 "System description tables not found\n");
267 return 0;
268 }
269 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
270 acpi_physical_address pa = 0;
271
272 acpi_find_root_pointer(&pa);
273 return pa;
274 }
275
276 return 0;
277 }
278
279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
280 static struct acpi_ioremap *
281 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
282 {
283 struct acpi_ioremap *map;
284
285 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
286 if (map->phys <= phys &&
287 phys + size <= map->phys + map->size)
288 return map;
289
290 return NULL;
291 }
292
293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
294 static void __iomem *
295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
296 {
297 struct acpi_ioremap *map;
298
299 map = acpi_map_lookup(phys, size);
300 if (map)
301 return map->virt + (phys - map->phys);
302
303 return NULL;
304 }
305
306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
307 {
308 struct acpi_ioremap *map;
309 void __iomem *virt = NULL;
310
311 mutex_lock(&acpi_ioremap_lock);
312 map = acpi_map_lookup(phys, size);
313 if (map) {
314 virt = map->virt + (phys - map->phys);
315 map->refcount++;
316 }
317 mutex_unlock(&acpi_ioremap_lock);
318 return virt;
319 }
320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
321
322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
323 static struct acpi_ioremap *
324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
325 {
326 struct acpi_ioremap *map;
327
328 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
329 if (map->virt <= virt &&
330 virt + size <= map->virt + map->size)
331 return map;
332
333 return NULL;
334 }
335
336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
337 /* ioremap will take care of cache attributes */
338 #define should_use_kmap(pfn) 0
339 #else
340 #define should_use_kmap(pfn) page_is_ram(pfn)
341 #endif
342
343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
344 {
345 unsigned long pfn;
346
347 pfn = pg_off >> PAGE_SHIFT;
348 if (should_use_kmap(pfn)) {
349 if (pg_sz > PAGE_SIZE)
350 return NULL;
351 return (void __iomem __force *)kmap(pfn_to_page(pfn));
352 } else
353 return acpi_os_ioremap(pg_off, pg_sz);
354 }
355
356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
357 {
358 unsigned long pfn;
359
360 pfn = pg_off >> PAGE_SHIFT;
361 if (should_use_kmap(pfn))
362 kunmap(pfn_to_page(pfn));
363 else
364 iounmap(vaddr);
365 }
366
367 void __iomem *__init_refok
368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
369 {
370 struct acpi_ioremap *map;
371 void __iomem *virt;
372 acpi_physical_address pg_off;
373 acpi_size pg_sz;
374
375 if (phys > ULONG_MAX) {
376 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
377 return NULL;
378 }
379
380 if (!acpi_gbl_permanent_mmap)
381 return __acpi_map_table((unsigned long)phys, size);
382
383 mutex_lock(&acpi_ioremap_lock);
384 /* Check if there's a suitable mapping already. */
385 map = acpi_map_lookup(phys, size);
386 if (map) {
387 map->refcount++;
388 goto out;
389 }
390
391 map = kzalloc(sizeof(*map), GFP_KERNEL);
392 if (!map) {
393 mutex_unlock(&acpi_ioremap_lock);
394 return NULL;
395 }
396
397 pg_off = round_down(phys, PAGE_SIZE);
398 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
399 virt = acpi_map(pg_off, pg_sz);
400 if (!virt) {
401 mutex_unlock(&acpi_ioremap_lock);
402 kfree(map);
403 return NULL;
404 }
405
406 INIT_LIST_HEAD(&map->list);
407 map->virt = virt;
408 map->phys = pg_off;
409 map->size = pg_sz;
410 map->refcount = 1;
411
412 list_add_tail_rcu(&map->list, &acpi_ioremaps);
413
414 out:
415 mutex_unlock(&acpi_ioremap_lock);
416 return map->virt + (phys - map->phys);
417 }
418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
419
420 void *__init_refok
421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
422 {
423 return (void *)acpi_os_map_iomem(phys, size);
424 }
425 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
426
427 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
428 {
429 if (!--map->refcount)
430 list_del_rcu(&map->list);
431 }
432
433 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
434 {
435 if (!map->refcount) {
436 synchronize_rcu_expedited();
437 acpi_unmap(map->phys, map->virt);
438 kfree(map);
439 }
440 }
441
442 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
443 {
444 struct acpi_ioremap *map;
445
446 if (!acpi_gbl_permanent_mmap) {
447 __acpi_unmap_table(virt, size);
448 return;
449 }
450
451 mutex_lock(&acpi_ioremap_lock);
452 map = acpi_map_lookup_virt(virt, size);
453 if (!map) {
454 mutex_unlock(&acpi_ioremap_lock);
455 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
456 return;
457 }
458 acpi_os_drop_map_ref(map);
459 mutex_unlock(&acpi_ioremap_lock);
460
461 acpi_os_map_cleanup(map);
462 }
463 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
464
465 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
466 {
467 return acpi_os_unmap_iomem((void __iomem *)virt, size);
468 }
469 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
470
471 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
472 {
473 if (!acpi_gbl_permanent_mmap)
474 __acpi_unmap_table(virt, size);
475 }
476
477 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
478 {
479 u64 addr;
480 void __iomem *virt;
481
482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 return 0;
484
485 /* Handle possible alignment issues */
486 memcpy(&addr, &gas->address, sizeof(addr));
487 if (!addr || !gas->bit_width)
488 return -EINVAL;
489
490 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
491 if (!virt)
492 return -EIO;
493
494 return 0;
495 }
496 EXPORT_SYMBOL(acpi_os_map_generic_address);
497
498 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
499 {
500 u64 addr;
501 struct acpi_ioremap *map;
502
503 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
504 return;
505
506 /* Handle possible alignment issues */
507 memcpy(&addr, &gas->address, sizeof(addr));
508 if (!addr || !gas->bit_width)
509 return;
510
511 mutex_lock(&acpi_ioremap_lock);
512 map = acpi_map_lookup(addr, gas->bit_width / 8);
513 if (!map) {
514 mutex_unlock(&acpi_ioremap_lock);
515 return;
516 }
517 acpi_os_drop_map_ref(map);
518 mutex_unlock(&acpi_ioremap_lock);
519
520 acpi_os_map_cleanup(map);
521 }
522 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
523
524 #ifdef ACPI_FUTURE_USAGE
525 acpi_status
526 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
527 {
528 if (!phys || !virt)
529 return AE_BAD_PARAMETER;
530
531 *phys = virt_to_phys(virt);
532
533 return AE_OK;
534 }
535 #endif
536
537 #define ACPI_MAX_OVERRIDE_LEN 100
538
539 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
540
541 acpi_status
542 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
543 acpi_string * new_val)
544 {
545 if (!init_val || !new_val)
546 return AE_BAD_PARAMETER;
547
548 *new_val = NULL;
549 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
550 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
551 acpi_os_name);
552 *new_val = acpi_os_name;
553 }
554
555 return AE_OK;
556 }
557
558 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
559 #include <linux/earlycpio.h>
560 #include <linux/memblock.h>
561
562 static u64 acpi_tables_addr;
563 static int all_tables_size;
564
565 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
566 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
567 {
568 u8 sum = 0;
569 u8 *end = buffer + length;
570
571 while (buffer < end)
572 sum = (u8) (sum + *(buffer++));
573 return sum;
574 }
575
576 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
577 static const char * const table_sigs[] = {
578 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
579 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
580 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
581 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
582 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
583 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
584 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
585 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
586 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
587
588 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
589
590 #define ACPI_OVERRIDE_TABLES 64
591 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
592
593 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
594
595 void __init acpi_initrd_override(void *data, size_t size)
596 {
597 int sig, no, table_nr = 0, total_offset = 0;
598 long offset = 0;
599 struct acpi_table_header *table;
600 char cpio_path[32] = "kernel/firmware/acpi/";
601 struct cpio_data file;
602
603 if (data == NULL || size == 0)
604 return;
605
606 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
607 file = find_cpio_data(cpio_path, data, size, &offset);
608 if (!file.data)
609 break;
610
611 data += offset;
612 size -= offset;
613
614 if (file.size < sizeof(struct acpi_table_header)) {
615 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
616 cpio_path, file.name);
617 continue;
618 }
619
620 table = file.data;
621
622 for (sig = 0; table_sigs[sig]; sig++)
623 if (!memcmp(table->signature, table_sigs[sig], 4))
624 break;
625
626 if (!table_sigs[sig]) {
627 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
628 cpio_path, file.name);
629 continue;
630 }
631 if (file.size != table->length) {
632 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
633 cpio_path, file.name);
634 continue;
635 }
636 if (acpi_table_checksum(file.data, table->length)) {
637 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
638 cpio_path, file.name);
639 continue;
640 }
641
642 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
643 table->signature, cpio_path, file.name, table->length);
644
645 all_tables_size += table->length;
646 acpi_initrd_files[table_nr].data = file.data;
647 acpi_initrd_files[table_nr].size = file.size;
648 table_nr++;
649 }
650 if (table_nr == 0)
651 return;
652
653 acpi_tables_addr =
654 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
655 all_tables_size, PAGE_SIZE);
656 if (!acpi_tables_addr) {
657 WARN_ON(1);
658 return;
659 }
660 /*
661 * Only calling e820_add_reserve does not work and the
662 * tables are invalid (memory got used) later.
663 * memblock_reserve works as expected and the tables won't get modified.
664 * But it's not enough on X86 because ioremap will
665 * complain later (used by acpi_os_map_memory) that the pages
666 * that should get mapped are not marked "reserved".
667 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
668 * works fine.
669 */
670 memblock_reserve(acpi_tables_addr, all_tables_size);
671 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
672
673 /*
674 * early_ioremap only can remap 256k one time. If we map all
675 * tables one time, we will hit the limit. Need to map chunks
676 * one by one during copying the same as that in relocate_initrd().
677 */
678 for (no = 0; no < table_nr; no++) {
679 unsigned char *src_p = acpi_initrd_files[no].data;
680 phys_addr_t size = acpi_initrd_files[no].size;
681 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
682 phys_addr_t slop, clen;
683 char *dest_p;
684
685 total_offset += size;
686
687 while (size) {
688 slop = dest_addr & ~PAGE_MASK;
689 clen = size;
690 if (clen > MAP_CHUNK_SIZE - slop)
691 clen = MAP_CHUNK_SIZE - slop;
692 dest_p = early_ioremap(dest_addr & PAGE_MASK,
693 clen + slop);
694 memcpy(dest_p + slop, src_p, clen);
695 early_iounmap(dest_p, clen + slop);
696 src_p += clen;
697 dest_addr += clen;
698 size -= clen;
699 }
700 }
701 }
702 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
703
704 static void acpi_table_taint(struct acpi_table_header *table)
705 {
706 pr_warn(PREFIX
707 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
708 table->signature, table->oem_table_id);
709 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
710 }
711
712
713 acpi_status
714 acpi_os_table_override(struct acpi_table_header * existing_table,
715 struct acpi_table_header ** new_table)
716 {
717 if (!existing_table || !new_table)
718 return AE_BAD_PARAMETER;
719
720 *new_table = NULL;
721
722 #ifdef CONFIG_ACPI_CUSTOM_DSDT
723 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
724 *new_table = (struct acpi_table_header *)AmlCode;
725 #endif
726 if (*new_table != NULL)
727 acpi_table_taint(existing_table);
728 return AE_OK;
729 }
730
731 acpi_status
732 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
733 acpi_physical_address *address,
734 u32 *table_length)
735 {
736 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
737 *table_length = 0;
738 *address = 0;
739 return AE_OK;
740 #else
741 int table_offset = 0;
742 struct acpi_table_header *table;
743
744 *table_length = 0;
745 *address = 0;
746
747 if (!acpi_tables_addr)
748 return AE_OK;
749
750 do {
751 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
752 WARN_ON(1);
753 return AE_OK;
754 }
755
756 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
757 ACPI_HEADER_SIZE);
758
759 if (table_offset + table->length > all_tables_size) {
760 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
761 WARN_ON(1);
762 return AE_OK;
763 }
764
765 table_offset += table->length;
766
767 if (memcmp(existing_table->signature, table->signature, 4)) {
768 acpi_os_unmap_memory(table,
769 ACPI_HEADER_SIZE);
770 continue;
771 }
772
773 /* Only override tables with matching oem id */
774 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
775 ACPI_OEM_TABLE_ID_SIZE)) {
776 acpi_os_unmap_memory(table,
777 ACPI_HEADER_SIZE);
778 continue;
779 }
780
781 table_offset -= table->length;
782 *table_length = table->length;
783 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
784 *address = acpi_tables_addr + table_offset;
785 break;
786 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
787
788 if (*address != 0)
789 acpi_table_taint(existing_table);
790 return AE_OK;
791 #endif
792 }
793
794 static irqreturn_t acpi_irq(int irq, void *dev_id)
795 {
796 u32 handled;
797
798 handled = (*acpi_irq_handler) (acpi_irq_context);
799
800 if (handled) {
801 acpi_irq_handled++;
802 return IRQ_HANDLED;
803 } else {
804 acpi_irq_not_handled++;
805 return IRQ_NONE;
806 }
807 }
808
809 acpi_status
810 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
811 void *context)
812 {
813 unsigned int irq;
814
815 acpi_irq_stats_init();
816
817 /*
818 * ACPI interrupts different from the SCI in our copy of the FADT are
819 * not supported.
820 */
821 if (gsi != acpi_gbl_FADT.sci_interrupt)
822 return AE_BAD_PARAMETER;
823
824 if (acpi_irq_handler)
825 return AE_ALREADY_ACQUIRED;
826
827 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
828 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
829 gsi);
830 return AE_OK;
831 }
832
833 acpi_irq_handler = handler;
834 acpi_irq_context = context;
835 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
836 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
837 acpi_irq_handler = NULL;
838 return AE_NOT_ACQUIRED;
839 }
840
841 return AE_OK;
842 }
843
844 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
845 {
846 if (irq != acpi_gbl_FADT.sci_interrupt)
847 return AE_BAD_PARAMETER;
848
849 free_irq(irq, acpi_irq);
850 acpi_irq_handler = NULL;
851
852 return AE_OK;
853 }
854
855 /*
856 * Running in interpreter thread context, safe to sleep
857 */
858
859 void acpi_os_sleep(u64 ms)
860 {
861 msleep(ms);
862 }
863
864 void acpi_os_stall(u32 us)
865 {
866 while (us) {
867 u32 delay = 1000;
868
869 if (delay > us)
870 delay = us;
871 udelay(delay);
872 touch_nmi_watchdog();
873 us -= delay;
874 }
875 }
876
877 /*
878 * Support ACPI 3.0 AML Timer operand
879 * Returns 64-bit free-running, monotonically increasing timer
880 * with 100ns granularity
881 */
882 u64 acpi_os_get_timer(void)
883 {
884 u64 time_ns = ktime_to_ns(ktime_get());
885 do_div(time_ns, 100);
886 return time_ns;
887 }
888
889 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
890 {
891 u32 dummy;
892
893 if (!value)
894 value = &dummy;
895
896 *value = 0;
897 if (width <= 8) {
898 *(u8 *) value = inb(port);
899 } else if (width <= 16) {
900 *(u16 *) value = inw(port);
901 } else if (width <= 32) {
902 *(u32 *) value = inl(port);
903 } else {
904 BUG();
905 }
906
907 return AE_OK;
908 }
909
910 EXPORT_SYMBOL(acpi_os_read_port);
911
912 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
913 {
914 if (width <= 8) {
915 outb(value, port);
916 } else if (width <= 16) {
917 outw(value, port);
918 } else if (width <= 32) {
919 outl(value, port);
920 } else {
921 BUG();
922 }
923
924 return AE_OK;
925 }
926
927 EXPORT_SYMBOL(acpi_os_write_port);
928
929 #ifdef readq
930 static inline u64 read64(const volatile void __iomem *addr)
931 {
932 return readq(addr);
933 }
934 #else
935 static inline u64 read64(const volatile void __iomem *addr)
936 {
937 u64 l, h;
938 l = readl(addr);
939 h = readl(addr+4);
940 return l | (h << 32);
941 }
942 #endif
943
944 acpi_status
945 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
946 {
947 void __iomem *virt_addr;
948 unsigned int size = width / 8;
949 bool unmap = false;
950 u64 dummy;
951
952 rcu_read_lock();
953 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
954 if (!virt_addr) {
955 rcu_read_unlock();
956 virt_addr = acpi_os_ioremap(phys_addr, size);
957 if (!virt_addr)
958 return AE_BAD_ADDRESS;
959 unmap = true;
960 }
961
962 if (!value)
963 value = &dummy;
964
965 switch (width) {
966 case 8:
967 *(u8 *) value = readb(virt_addr);
968 break;
969 case 16:
970 *(u16 *) value = readw(virt_addr);
971 break;
972 case 32:
973 *(u32 *) value = readl(virt_addr);
974 break;
975 case 64:
976 *(u64 *) value = read64(virt_addr);
977 break;
978 default:
979 BUG();
980 }
981
982 if (unmap)
983 iounmap(virt_addr);
984 else
985 rcu_read_unlock();
986
987 return AE_OK;
988 }
989
990 #ifdef writeq
991 static inline void write64(u64 val, volatile void __iomem *addr)
992 {
993 writeq(val, addr);
994 }
995 #else
996 static inline void write64(u64 val, volatile void __iomem *addr)
997 {
998 writel(val, addr);
999 writel(val>>32, addr+4);
1000 }
1001 #endif
1002
1003 acpi_status
1004 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1005 {
1006 void __iomem *virt_addr;
1007 unsigned int size = width / 8;
1008 bool unmap = false;
1009
1010 rcu_read_lock();
1011 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1012 if (!virt_addr) {
1013 rcu_read_unlock();
1014 virt_addr = acpi_os_ioremap(phys_addr, size);
1015 if (!virt_addr)
1016 return AE_BAD_ADDRESS;
1017 unmap = true;
1018 }
1019
1020 switch (width) {
1021 case 8:
1022 writeb(value, virt_addr);
1023 break;
1024 case 16:
1025 writew(value, virt_addr);
1026 break;
1027 case 32:
1028 writel(value, virt_addr);
1029 break;
1030 case 64:
1031 write64(value, virt_addr);
1032 break;
1033 default:
1034 BUG();
1035 }
1036
1037 if (unmap)
1038 iounmap(virt_addr);
1039 else
1040 rcu_read_unlock();
1041
1042 return AE_OK;
1043 }
1044
1045 acpi_status
1046 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1047 u64 *value, u32 width)
1048 {
1049 int result, size;
1050 u32 value32;
1051
1052 if (!value)
1053 return AE_BAD_PARAMETER;
1054
1055 switch (width) {
1056 case 8:
1057 size = 1;
1058 break;
1059 case 16:
1060 size = 2;
1061 break;
1062 case 32:
1063 size = 4;
1064 break;
1065 default:
1066 return AE_ERROR;
1067 }
1068
1069 result = raw_pci_read(pci_id->segment, pci_id->bus,
1070 PCI_DEVFN(pci_id->device, pci_id->function),
1071 reg, size, &value32);
1072 *value = value32;
1073
1074 return (result ? AE_ERROR : AE_OK);
1075 }
1076
1077 acpi_status
1078 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1079 u64 value, u32 width)
1080 {
1081 int result, size;
1082
1083 switch (width) {
1084 case 8:
1085 size = 1;
1086 break;
1087 case 16:
1088 size = 2;
1089 break;
1090 case 32:
1091 size = 4;
1092 break;
1093 default:
1094 return AE_ERROR;
1095 }
1096
1097 result = raw_pci_write(pci_id->segment, pci_id->bus,
1098 PCI_DEVFN(pci_id->device, pci_id->function),
1099 reg, size, value);
1100
1101 return (result ? AE_ERROR : AE_OK);
1102 }
1103
1104 static void acpi_os_execute_deferred(struct work_struct *work)
1105 {
1106 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1107
1108 dpc->function(dpc->context);
1109 kfree(dpc);
1110 }
1111
1112 /*******************************************************************************
1113 *
1114 * FUNCTION: acpi_os_execute
1115 *
1116 * PARAMETERS: Type - Type of the callback
1117 * Function - Function to be executed
1118 * Context - Function parameters
1119 *
1120 * RETURN: Status
1121 *
1122 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1123 * immediately executes function on a separate thread.
1124 *
1125 ******************************************************************************/
1126
1127 acpi_status acpi_os_execute(acpi_execute_type type,
1128 acpi_osd_exec_callback function, void *context)
1129 {
1130 acpi_status status = AE_OK;
1131 struct acpi_os_dpc *dpc;
1132 struct workqueue_struct *queue;
1133 int ret;
1134 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1135 "Scheduling function [%p(%p)] for deferred execution.\n",
1136 function, context));
1137
1138 /*
1139 * Allocate/initialize DPC structure. Note that this memory will be
1140 * freed by the callee. The kernel handles the work_struct list in a
1141 * way that allows us to also free its memory inside the callee.
1142 * Because we may want to schedule several tasks with different
1143 * parameters we can't use the approach some kernel code uses of
1144 * having a static work_struct.
1145 */
1146
1147 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1148 if (!dpc)
1149 return AE_NO_MEMORY;
1150
1151 dpc->function = function;
1152 dpc->context = context;
1153
1154 /*
1155 * To prevent lockdep from complaining unnecessarily, make sure that
1156 * there is a different static lockdep key for each workqueue by using
1157 * INIT_WORK() for each of them separately.
1158 */
1159 if (type == OSL_NOTIFY_HANDLER) {
1160 queue = kacpi_notify_wq;
1161 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1162 } else {
1163 queue = kacpid_wq;
1164 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1165 }
1166
1167 /*
1168 * On some machines, a software-initiated SMI causes corruption unless
1169 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1170 * typically it's done in GPE-related methods that are run via
1171 * workqueues, so we can avoid the known corruption cases by always
1172 * queueing on CPU 0.
1173 */
1174 ret = queue_work_on(0, queue, &dpc->work);
1175
1176 if (!ret) {
1177 printk(KERN_ERR PREFIX
1178 "Call to queue_work() failed.\n");
1179 status = AE_ERROR;
1180 kfree(dpc);
1181 }
1182 return status;
1183 }
1184 EXPORT_SYMBOL(acpi_os_execute);
1185
1186 void acpi_os_wait_events_complete(void)
1187 {
1188 /*
1189 * Make sure the GPE handler or the fixed event handler is not used
1190 * on another CPU after removal.
1191 */
1192 if (acpi_irq_handler)
1193 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt);
1194 flush_workqueue(kacpid_wq);
1195 flush_workqueue(kacpi_notify_wq);
1196 }
1197
1198 struct acpi_hp_work {
1199 struct work_struct work;
1200 struct acpi_device *adev;
1201 u32 src;
1202 };
1203
1204 static void acpi_hotplug_work_fn(struct work_struct *work)
1205 {
1206 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1207
1208 acpi_os_wait_events_complete();
1209 acpi_device_hotplug(hpw->adev, hpw->src);
1210 kfree(hpw);
1211 }
1212
1213 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1214 {
1215 struct acpi_hp_work *hpw;
1216
1217 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1218 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1219 adev, src));
1220
1221 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1222 if (!hpw)
1223 return AE_NO_MEMORY;
1224
1225 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1226 hpw->adev = adev;
1227 hpw->src = src;
1228 /*
1229 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1230 * the hotplug code may call driver .remove() functions, which may
1231 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1232 * these workqueues.
1233 */
1234 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1235 kfree(hpw);
1236 return AE_ERROR;
1237 }
1238 return AE_OK;
1239 }
1240
1241 bool acpi_queue_hotplug_work(struct work_struct *work)
1242 {
1243 return queue_work(kacpi_hotplug_wq, work);
1244 }
1245
1246 acpi_status
1247 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1248 {
1249 struct semaphore *sem = NULL;
1250
1251 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1252 if (!sem)
1253 return AE_NO_MEMORY;
1254
1255 sema_init(sem, initial_units);
1256
1257 *handle = (acpi_handle *) sem;
1258
1259 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1260 *handle, initial_units));
1261
1262 return AE_OK;
1263 }
1264
1265 /*
1266 * TODO: A better way to delete semaphores? Linux doesn't have a
1267 * 'delete_semaphore()' function -- may result in an invalid
1268 * pointer dereference for non-synchronized consumers. Should
1269 * we at least check for blocked threads and signal/cancel them?
1270 */
1271
1272 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1273 {
1274 struct semaphore *sem = (struct semaphore *)handle;
1275
1276 if (!sem)
1277 return AE_BAD_PARAMETER;
1278
1279 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1280
1281 BUG_ON(!list_empty(&sem->wait_list));
1282 kfree(sem);
1283 sem = NULL;
1284
1285 return AE_OK;
1286 }
1287
1288 /*
1289 * TODO: Support for units > 1?
1290 */
1291 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1292 {
1293 acpi_status status = AE_OK;
1294 struct semaphore *sem = (struct semaphore *)handle;
1295 long jiffies;
1296 int ret = 0;
1297
1298 if (!sem || (units < 1))
1299 return AE_BAD_PARAMETER;
1300
1301 if (units > 1)
1302 return AE_SUPPORT;
1303
1304 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1305 handle, units, timeout));
1306
1307 if (timeout == ACPI_WAIT_FOREVER)
1308 jiffies = MAX_SCHEDULE_TIMEOUT;
1309 else
1310 jiffies = msecs_to_jiffies(timeout);
1311
1312 ret = down_timeout(sem, jiffies);
1313 if (ret)
1314 status = AE_TIME;
1315
1316 if (ACPI_FAILURE(status)) {
1317 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1318 "Failed to acquire semaphore[%p|%d|%d], %s",
1319 handle, units, timeout,
1320 acpi_format_exception(status)));
1321 } else {
1322 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1323 "Acquired semaphore[%p|%d|%d]", handle,
1324 units, timeout));
1325 }
1326
1327 return status;
1328 }
1329
1330 /*
1331 * TODO: Support for units > 1?
1332 */
1333 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1334 {
1335 struct semaphore *sem = (struct semaphore *)handle;
1336
1337 if (!sem || (units < 1))
1338 return AE_BAD_PARAMETER;
1339
1340 if (units > 1)
1341 return AE_SUPPORT;
1342
1343 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1344 units));
1345
1346 up(sem);
1347
1348 return AE_OK;
1349 }
1350
1351 #ifdef ACPI_FUTURE_USAGE
1352 u32 acpi_os_get_line(char *buffer)
1353 {
1354
1355 #ifdef ENABLE_DEBUGGER
1356 if (acpi_in_debugger) {
1357 u32 chars;
1358
1359 kdb_read(buffer, sizeof(line_buf));
1360
1361 /* remove the CR kdb includes */
1362 chars = strlen(buffer) - 1;
1363 buffer[chars] = '\0';
1364 }
1365 #endif
1366
1367 return 0;
1368 }
1369 #endif /* ACPI_FUTURE_USAGE */
1370
1371 acpi_status acpi_os_signal(u32 function, void *info)
1372 {
1373 switch (function) {
1374 case ACPI_SIGNAL_FATAL:
1375 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1376 break;
1377 case ACPI_SIGNAL_BREAKPOINT:
1378 /*
1379 * AML Breakpoint
1380 * ACPI spec. says to treat it as a NOP unless
1381 * you are debugging. So if/when we integrate
1382 * AML debugger into the kernel debugger its
1383 * hook will go here. But until then it is
1384 * not useful to print anything on breakpoints.
1385 */
1386 break;
1387 default:
1388 break;
1389 }
1390
1391 return AE_OK;
1392 }
1393
1394 static int __init acpi_os_name_setup(char *str)
1395 {
1396 char *p = acpi_os_name;
1397 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1398
1399 if (!str || !*str)
1400 return 0;
1401
1402 for (; count-- && *str; str++) {
1403 if (isalnum(*str) || *str == ' ' || *str == ':')
1404 *p++ = *str;
1405 else if (*str == '\'' || *str == '"')
1406 continue;
1407 else
1408 break;
1409 }
1410 *p = 0;
1411
1412 return 1;
1413
1414 }
1415
1416 __setup("acpi_os_name=", acpi_os_name_setup);
1417
1418 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1419 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1420
1421 struct osi_setup_entry {
1422 char string[OSI_STRING_LENGTH_MAX];
1423 bool enable;
1424 };
1425
1426 static struct osi_setup_entry
1427 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1428 {"Module Device", true},
1429 {"Processor Device", true},
1430 {"3.0 _SCP Extensions", true},
1431 {"Processor Aggregator Device", true},
1432 };
1433
1434 void __init acpi_osi_setup(char *str)
1435 {
1436 struct osi_setup_entry *osi;
1437 bool enable = true;
1438 int i;
1439
1440 if (!acpi_gbl_create_osi_method)
1441 return;
1442
1443 if (str == NULL || *str == '\0') {
1444 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1445 acpi_gbl_create_osi_method = FALSE;
1446 return;
1447 }
1448
1449 if (*str == '!') {
1450 str++;
1451 if (*str == '\0') {
1452 osi_linux.default_disabling = 1;
1453 return;
1454 } else if (*str == '*') {
1455 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1456 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1457 osi = &osi_setup_entries[i];
1458 osi->enable = false;
1459 }
1460 return;
1461 }
1462 enable = false;
1463 }
1464
1465 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1466 osi = &osi_setup_entries[i];
1467 if (!strcmp(osi->string, str)) {
1468 osi->enable = enable;
1469 break;
1470 } else if (osi->string[0] == '\0') {
1471 osi->enable = enable;
1472 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1473 break;
1474 }
1475 }
1476 }
1477
1478 static void __init set_osi_linux(unsigned int enable)
1479 {
1480 if (osi_linux.enable != enable)
1481 osi_linux.enable = enable;
1482
1483 if (osi_linux.enable)
1484 acpi_osi_setup("Linux");
1485 else
1486 acpi_osi_setup("!Linux");
1487
1488 return;
1489 }
1490
1491 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1492 {
1493 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1494 osi_linux.dmi = 0;
1495 set_osi_linux(enable);
1496
1497 return;
1498 }
1499
1500 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1501 {
1502 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1503
1504 if (enable == -1)
1505 return;
1506
1507 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1508 set_osi_linux(enable);
1509
1510 return;
1511 }
1512
1513 /*
1514 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1515 *
1516 * empty string disables _OSI
1517 * string starting with '!' disables that string
1518 * otherwise string is added to list, augmenting built-in strings
1519 */
1520 static void __init acpi_osi_setup_late(void)
1521 {
1522 struct osi_setup_entry *osi;
1523 char *str;
1524 int i;
1525 acpi_status status;
1526
1527 if (osi_linux.default_disabling) {
1528 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1529
1530 if (ACPI_SUCCESS(status))
1531 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1532 }
1533
1534 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1535 osi = &osi_setup_entries[i];
1536 str = osi->string;
1537
1538 if (*str == '\0')
1539 break;
1540 if (osi->enable) {
1541 status = acpi_install_interface(str);
1542
1543 if (ACPI_SUCCESS(status))
1544 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1545 } else {
1546 status = acpi_remove_interface(str);
1547
1548 if (ACPI_SUCCESS(status))
1549 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1550 }
1551 }
1552 }
1553
1554 static int __init osi_setup(char *str)
1555 {
1556 if (str && !strcmp("Linux", str))
1557 acpi_cmdline_osi_linux(1);
1558 else if (str && !strcmp("!Linux", str))
1559 acpi_cmdline_osi_linux(0);
1560 else
1561 acpi_osi_setup(str);
1562
1563 return 1;
1564 }
1565
1566 __setup("acpi_osi=", osi_setup);
1567
1568 /*
1569 * Disable the auto-serialization of named objects creation methods.
1570 *
1571 * This feature is enabled by default. It marks the AML control methods
1572 * that contain the opcodes to create named objects as "Serialized".
1573 */
1574 static int __init acpi_no_auto_serialize_setup(char *str)
1575 {
1576 acpi_gbl_auto_serialize_methods = FALSE;
1577 pr_info("ACPI: auto-serialization disabled\n");
1578
1579 return 1;
1580 }
1581
1582 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1583
1584 /* Check of resource interference between native drivers and ACPI
1585 * OperationRegions (SystemIO and System Memory only).
1586 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1587 * in arbitrary AML code and can interfere with legacy drivers.
1588 * acpi_enforce_resources= can be set to:
1589 *
1590 * - strict (default) (2)
1591 * -> further driver trying to access the resources will not load
1592 * - lax (1)
1593 * -> further driver trying to access the resources will load, but you
1594 * get a system message that something might go wrong...
1595 *
1596 * - no (0)
1597 * -> ACPI Operation Region resources will not be registered
1598 *
1599 */
1600 #define ENFORCE_RESOURCES_STRICT 2
1601 #define ENFORCE_RESOURCES_LAX 1
1602 #define ENFORCE_RESOURCES_NO 0
1603
1604 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1605
1606 static int __init acpi_enforce_resources_setup(char *str)
1607 {
1608 if (str == NULL || *str == '\0')
1609 return 0;
1610
1611 if (!strcmp("strict", str))
1612 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1613 else if (!strcmp("lax", str))
1614 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1615 else if (!strcmp("no", str))
1616 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1617
1618 return 1;
1619 }
1620
1621 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1622
1623 /* Check for resource conflicts between ACPI OperationRegions and native
1624 * drivers */
1625 int acpi_check_resource_conflict(const struct resource *res)
1626 {
1627 acpi_adr_space_type space_id;
1628 acpi_size length;
1629 u8 warn = 0;
1630 int clash = 0;
1631
1632 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1633 return 0;
1634 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1635 return 0;
1636
1637 if (res->flags & IORESOURCE_IO)
1638 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1639 else
1640 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1641
1642 length = resource_size(res);
1643 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1644 warn = 1;
1645 clash = acpi_check_address_range(space_id, res->start, length, warn);
1646
1647 if (clash) {
1648 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1649 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1650 printk(KERN_NOTICE "ACPI: This conflict may"
1651 " cause random problems and system"
1652 " instability\n");
1653 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1654 " for this device, you should use it instead of"
1655 " the native driver\n");
1656 }
1657 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1658 return -EBUSY;
1659 }
1660 return 0;
1661 }
1662 EXPORT_SYMBOL(acpi_check_resource_conflict);
1663
1664 int acpi_check_region(resource_size_t start, resource_size_t n,
1665 const char *name)
1666 {
1667 struct resource res = {
1668 .start = start,
1669 .end = start + n - 1,
1670 .name = name,
1671 .flags = IORESOURCE_IO,
1672 };
1673
1674 return acpi_check_resource_conflict(&res);
1675 }
1676 EXPORT_SYMBOL(acpi_check_region);
1677
1678 /*
1679 * Let drivers know whether the resource checks are effective
1680 */
1681 int acpi_resources_are_enforced(void)
1682 {
1683 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1684 }
1685 EXPORT_SYMBOL(acpi_resources_are_enforced);
1686
1687 /*
1688 * Deallocate the memory for a spinlock.
1689 */
1690 void acpi_os_delete_lock(acpi_spinlock handle)
1691 {
1692 ACPI_FREE(handle);
1693 }
1694
1695 /*
1696 * Acquire a spinlock.
1697 *
1698 * handle is a pointer to the spinlock_t.
1699 */
1700
1701 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1702 {
1703 acpi_cpu_flags flags;
1704 spin_lock_irqsave(lockp, flags);
1705 return flags;
1706 }
1707
1708 /*
1709 * Release a spinlock. See above.
1710 */
1711
1712 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1713 {
1714 spin_unlock_irqrestore(lockp, flags);
1715 }
1716
1717 #ifndef ACPI_USE_LOCAL_CACHE
1718
1719 /*******************************************************************************
1720 *
1721 * FUNCTION: acpi_os_create_cache
1722 *
1723 * PARAMETERS: name - Ascii name for the cache
1724 * size - Size of each cached object
1725 * depth - Maximum depth of the cache (in objects) <ignored>
1726 * cache - Where the new cache object is returned
1727 *
1728 * RETURN: status
1729 *
1730 * DESCRIPTION: Create a cache object
1731 *
1732 ******************************************************************************/
1733
1734 acpi_status
1735 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1736 {
1737 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1738 if (*cache == NULL)
1739 return AE_ERROR;
1740 else
1741 return AE_OK;
1742 }
1743
1744 /*******************************************************************************
1745 *
1746 * FUNCTION: acpi_os_purge_cache
1747 *
1748 * PARAMETERS: Cache - Handle to cache object
1749 *
1750 * RETURN: Status
1751 *
1752 * DESCRIPTION: Free all objects within the requested cache.
1753 *
1754 ******************************************************************************/
1755
1756 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1757 {
1758 kmem_cache_shrink(cache);
1759 return (AE_OK);
1760 }
1761
1762 /*******************************************************************************
1763 *
1764 * FUNCTION: acpi_os_delete_cache
1765 *
1766 * PARAMETERS: Cache - Handle to cache object
1767 *
1768 * RETURN: Status
1769 *
1770 * DESCRIPTION: Free all objects within the requested cache and delete the
1771 * cache object.
1772 *
1773 ******************************************************************************/
1774
1775 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1776 {
1777 kmem_cache_destroy(cache);
1778 return (AE_OK);
1779 }
1780
1781 /*******************************************************************************
1782 *
1783 * FUNCTION: acpi_os_release_object
1784 *
1785 * PARAMETERS: Cache - Handle to cache object
1786 * Object - The object to be released
1787 *
1788 * RETURN: None
1789 *
1790 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1791 * the object is deleted.
1792 *
1793 ******************************************************************************/
1794
1795 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1796 {
1797 kmem_cache_free(cache, object);
1798 return (AE_OK);
1799 }
1800 #endif
1801
1802 static int __init acpi_no_static_ssdt_setup(char *s)
1803 {
1804 acpi_gbl_disable_ssdt_table_install = TRUE;
1805 pr_info("ACPI: static SSDT installation disabled\n");
1806
1807 return 0;
1808 }
1809
1810 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1811
1812 static int __init acpi_disable_return_repair(char *s)
1813 {
1814 printk(KERN_NOTICE PREFIX
1815 "ACPI: Predefined validation mechanism disabled\n");
1816 acpi_gbl_disable_auto_repair = TRUE;
1817
1818 return 1;
1819 }
1820
1821 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1822
1823 acpi_status __init acpi_os_initialize(void)
1824 {
1825 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1826 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1827 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1828 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1829 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1830 /*
1831 * Use acpi_os_map_generic_address to pre-map the reset
1832 * register if it's in system memory.
1833 */
1834 int rv;
1835
1836 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1837 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1838 }
1839
1840 return AE_OK;
1841 }
1842
1843 acpi_status __init acpi_os_initialize1(void)
1844 {
1845 acpi_reserve_resources();
1846 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1847 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1848 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1849 BUG_ON(!kacpid_wq);
1850 BUG_ON(!kacpi_notify_wq);
1851 BUG_ON(!kacpi_hotplug_wq);
1852 acpi_install_interface_handler(acpi_osi_handler);
1853 acpi_osi_setup_late();
1854 return AE_OK;
1855 }
1856
1857 acpi_status acpi_os_terminate(void)
1858 {
1859 if (acpi_irq_handler) {
1860 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1861 acpi_irq_handler);
1862 }
1863
1864 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1865 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1866 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1867 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1868 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1869 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1870
1871 destroy_workqueue(kacpid_wq);
1872 destroy_workqueue(kacpi_notify_wq);
1873 destroy_workqueue(kacpi_hotplug_wq);
1874
1875 return AE_OK;
1876 }
1877
1878 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1879 u32 pm1b_control)
1880 {
1881 int rc = 0;
1882 if (__acpi_os_prepare_sleep)
1883 rc = __acpi_os_prepare_sleep(sleep_state,
1884 pm1a_control, pm1b_control);
1885 if (rc < 0)
1886 return AE_ERROR;
1887 else if (rc > 0)
1888 return AE_CTRL_SKIP;
1889
1890 return AE_OK;
1891 }
1892
1893 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1894 u32 pm1a_ctrl, u32 pm1b_ctrl))
1895 {
1896 __acpi_os_prepare_sleep = func;
1897 }
1898
1899 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1900 u32 val_b)
1901 {
1902 int rc = 0;
1903 if (__acpi_os_prepare_extended_sleep)
1904 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1905 val_a, val_b);
1906 if (rc < 0)
1907 return AE_ERROR;
1908 else if (rc > 0)
1909 return AE_CTRL_SKIP;
1910
1911 return AE_OK;
1912 }
1913
1914 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1915 u32 val_a, u32 val_b))
1916 {
1917 __acpi_os_prepare_extended_sleep = func;
1918 }
Linux kernel - Deliverables
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