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