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usb: gadget: r8a66597-udc: use devm_clk_get() to get clock
[linux-2.6/btrfs-unstable.git] / drivers / acpi / osl.c
blobbad25b070fe0bfe8b0204cce2ddd5ce30f07ec91
1 /*
2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3 *
4 * Copyright (C) 2000 Andrew Henroid
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (c) 2008 Intel Corporation
8 * Author: Matthew Wilcox <willy@linux.intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
47
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include "internal.h"
52
53 #define _COMPONENT ACPI_OS_SERVICES
54 ACPI_MODULE_NAME("osl");
55
56 struct acpi_os_dpc {
57 acpi_osd_exec_callback function;
58 void *context;
59 struct work_struct work;
60 };
61
62 #ifdef CONFIG_ACPI_CUSTOM_DSDT
63 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
64 #endif
65
66 #ifdef ENABLE_DEBUGGER
67 #include <linux/kdb.h>
68
69 /* stuff for debugger support */
70 int acpi_in_debugger;
71 EXPORT_SYMBOL(acpi_in_debugger);
72
73 extern char line_buf[80];
74 #endif /*ENABLE_DEBUGGER */
75
76 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
77 u32 pm1b_ctrl);
78 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
79 u32 val_b);
80
81 static acpi_osd_handler acpi_irq_handler;
82 static void *acpi_irq_context;
83 static struct workqueue_struct *kacpid_wq;
84 static struct workqueue_struct *kacpi_notify_wq;
85 static struct workqueue_struct *kacpi_hotplug_wq;
86
87 /*
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
90 */
91 struct acpi_ioremap {
92 struct list_head list;
93 void __iomem *virt;
94 acpi_physical_address phys;
95 acpi_size size;
96 unsigned long refcount;
97 };
98
99 static LIST_HEAD(acpi_ioremaps);
100 static DEFINE_MUTEX(acpi_ioremap_lock);
101
102 static void __init acpi_osi_setup_late(void);
103
104 /*
105 * The story of _OSI(Linux)
106 *
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
109 *
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
114 *
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
126 *
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
129 *
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
135 */
136
137 static struct osi_linux {
138 unsigned int enable:1;
139 unsigned int dmi:1;
140 unsigned int cmdline:1;
141 unsigned int default_disabling:1;
142 } osi_linux = {0, 0, 0, 0};
143
144 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145 {
146 if (!strcmp("Linux", interface)) {
147
148 printk_once(KERN_NOTICE FW_BUG PREFIX
149 "BIOS _OSI(Linux) query %s%s\n",
150 osi_linux.enable ? "honored" : "ignored",
151 osi_linux.cmdline ? " via cmdline" :
152 osi_linux.dmi ? " via DMI" : "");
153 }
154
155 return supported;
156 }
157
158 static void __init acpi_request_region (struct acpi_generic_address *gas,
159 unsigned int length, char *desc)
160 {
161 u64 addr;
162
163 /* Handle possible alignment issues */
164 memcpy(&addr, &gas->address, sizeof(addr));
165 if (!addr || !length)
166 return;
167
168 /* Resources are never freed */
169 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
170 request_region(addr, length, desc);
171 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
172 request_mem_region(addr, length, desc);
173 }
174
175 static int __init acpi_reserve_resources(void)
176 {
177 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
178 "ACPI PM1a_EVT_BLK");
179
180 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
181 "ACPI PM1b_EVT_BLK");
182
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
184 "ACPI PM1a_CNT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
187 "ACPI PM1b_CNT_BLK");
188
189 if (acpi_gbl_FADT.pm_timer_length == 4)
190 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
193 "ACPI PM2_CNT_BLK");
194
195 /* Length of GPE blocks must be a non-negative multiple of 2 */
196
197 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
198 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
199 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200
201 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
202 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
203 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
204
205 return 0;
206 }
207 device_initcall(acpi_reserve_resources);
208
209 void acpi_os_printf(const char *fmt, ...)
210 {
211 va_list args;
212 va_start(args, fmt);
213 acpi_os_vprintf(fmt, args);
214 va_end(args);
215 }
216
217 void acpi_os_vprintf(const char *fmt, va_list args)
218 {
219 static char buffer[512];
220
221 vsprintf(buffer, fmt, args);
222
223 #ifdef ENABLE_DEBUGGER
224 if (acpi_in_debugger) {
225 kdb_printf("%s", buffer);
226 } else {
227 printk(KERN_CONT "%s", buffer);
228 }
229 #else
230 printk(KERN_CONT "%s", buffer);
231 #endif
232 }
233
234 #ifdef CONFIG_KEXEC
235 static unsigned long acpi_rsdp;
236 static int __init setup_acpi_rsdp(char *arg)
237 {
238 if (kstrtoul(arg, 16, &acpi_rsdp))
239 return -EINVAL;
240 return 0;
241 }
242 early_param("acpi_rsdp", setup_acpi_rsdp);
243 #endif
244
245 acpi_physical_address __init acpi_os_get_root_pointer(void)
246 {
247 #ifdef CONFIG_KEXEC
248 if (acpi_rsdp)
249 return acpi_rsdp;
250 #endif
251
252 if (efi_enabled(EFI_CONFIG_TABLES)) {
253 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
254 return efi.acpi20;
255 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
256 return efi.acpi;
257 else {
258 printk(KERN_ERR PREFIX
259 "System description tables not found\n");
260 return 0;
261 }
262 } else {
263 acpi_physical_address pa = 0;
264
265 acpi_find_root_pointer(&pa);
266 return pa;
267 }
268 }
269
270 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
271 static struct acpi_ioremap *
272 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
273 {
274 struct acpi_ioremap *map;
275
276 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
277 if (map->phys <= phys &&
278 phys + size <= map->phys + map->size)
279 return map;
280
281 return NULL;
282 }
283
284 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
285 static void __iomem *
286 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
287 {
288 struct acpi_ioremap *map;
289
290 map = acpi_map_lookup(phys, size);
291 if (map)
292 return map->virt + (phys - map->phys);
293
294 return NULL;
295 }
296
297 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
298 {
299 struct acpi_ioremap *map;
300 void __iomem *virt = NULL;
301
302 mutex_lock(&acpi_ioremap_lock);
303 map = acpi_map_lookup(phys, size);
304 if (map) {
305 virt = map->virt + (phys - map->phys);
306 map->refcount++;
307 }
308 mutex_unlock(&acpi_ioremap_lock);
309 return virt;
310 }
311 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
312
313 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
314 static struct acpi_ioremap *
315 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
316 {
317 struct acpi_ioremap *map;
318
319 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
320 if (map->virt <= virt &&
321 virt + size <= map->virt + map->size)
322 return map;
323
324 return NULL;
325 }
326
327 #ifndef CONFIG_IA64
328 #define should_use_kmap(pfn) page_is_ram(pfn)
329 #else
330 /* ioremap will take care of cache attributes */
331 #define should_use_kmap(pfn) 0
332 #endif
333
334 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
335 {
336 unsigned long pfn;
337
338 pfn = pg_off >> PAGE_SHIFT;
339 if (should_use_kmap(pfn)) {
340 if (pg_sz > PAGE_SIZE)
341 return NULL;
342 return (void __iomem __force *)kmap(pfn_to_page(pfn));
343 } else
344 return acpi_os_ioremap(pg_off, pg_sz);
345 }
346
347 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
348 {
349 unsigned long pfn;
350
351 pfn = pg_off >> PAGE_SHIFT;
352 if (should_use_kmap(pfn))
353 kunmap(pfn_to_page(pfn));
354 else
355 iounmap(vaddr);
356 }
357
358 void __iomem *__init_refok
359 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
360 {
361 struct acpi_ioremap *map;
362 void __iomem *virt;
363 acpi_physical_address pg_off;
364 acpi_size pg_sz;
365
366 if (phys > ULONG_MAX) {
367 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
368 return NULL;
369 }
370
371 if (!acpi_gbl_permanent_mmap)
372 return __acpi_map_table((unsigned long)phys, size);
373
374 mutex_lock(&acpi_ioremap_lock);
375 /* Check if there's a suitable mapping already. */
376 map = acpi_map_lookup(phys, size);
377 if (map) {
378 map->refcount++;
379 goto out;
380 }
381
382 map = kzalloc(sizeof(*map), GFP_KERNEL);
383 if (!map) {
384 mutex_unlock(&acpi_ioremap_lock);
385 return NULL;
386 }
387
388 pg_off = round_down(phys, PAGE_SIZE);
389 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
390 virt = acpi_map(pg_off, pg_sz);
391 if (!virt) {
392 mutex_unlock(&acpi_ioremap_lock);
393 kfree(map);
394 return NULL;
395 }
396
397 INIT_LIST_HEAD(&map->list);
398 map->virt = virt;
399 map->phys = pg_off;
400 map->size = pg_sz;
401 map->refcount = 1;
402
403 list_add_tail_rcu(&map->list, &acpi_ioremaps);
404
405 out:
406 mutex_unlock(&acpi_ioremap_lock);
407 return map->virt + (phys - map->phys);
408 }
409 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
410
411 void *__init_refok
412 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
413 {
414 return (void *)acpi_os_map_iomem(phys, size);
415 }
416 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
417
418 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
419 {
420 if (!--map->refcount)
421 list_del_rcu(&map->list);
422 }
423
424 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
425 {
426 if (!map->refcount) {
427 synchronize_rcu();
428 acpi_unmap(map->phys, map->virt);
429 kfree(map);
430 }
431 }
432
433 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
434 {
435 struct acpi_ioremap *map;
436
437 if (!acpi_gbl_permanent_mmap) {
438 __acpi_unmap_table(virt, size);
439 return;
440 }
441
442 mutex_lock(&acpi_ioremap_lock);
443 map = acpi_map_lookup_virt(virt, size);
444 if (!map) {
445 mutex_unlock(&acpi_ioremap_lock);
446 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
447 return;
448 }
449 acpi_os_drop_map_ref(map);
450 mutex_unlock(&acpi_ioremap_lock);
451
452 acpi_os_map_cleanup(map);
453 }
454 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
455
456 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
457 {
458 return acpi_os_unmap_iomem((void __iomem *)virt, size);
459 }
460 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
461
462 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
463 {
464 if (!acpi_gbl_permanent_mmap)
465 __acpi_unmap_table(virt, size);
466 }
467
468 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
469 {
470 u64 addr;
471 void __iomem *virt;
472
473 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
474 return 0;
475
476 /* Handle possible alignment issues */
477 memcpy(&addr, &gas->address, sizeof(addr));
478 if (!addr || !gas->bit_width)
479 return -EINVAL;
480
481 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
482 if (!virt)
483 return -EIO;
484
485 return 0;
486 }
487 EXPORT_SYMBOL(acpi_os_map_generic_address);
488
489 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
490 {
491 u64 addr;
492 struct acpi_ioremap *map;
493
494 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
495 return;
496
497 /* Handle possible alignment issues */
498 memcpy(&addr, &gas->address, sizeof(addr));
499 if (!addr || !gas->bit_width)
500 return;
501
502 mutex_lock(&acpi_ioremap_lock);
503 map = acpi_map_lookup(addr, gas->bit_width / 8);
504 if (!map) {
505 mutex_unlock(&acpi_ioremap_lock);
506 return;
507 }
508 acpi_os_drop_map_ref(map);
509 mutex_unlock(&acpi_ioremap_lock);
510
511 acpi_os_map_cleanup(map);
512 }
513 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
514
515 #ifdef ACPI_FUTURE_USAGE
516 acpi_status
517 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
518 {
519 if (!phys || !virt)
520 return AE_BAD_PARAMETER;
521
522 *phys = virt_to_phys(virt);
523
524 return AE_OK;
525 }
526 #endif
527
528 #define ACPI_MAX_OVERRIDE_LEN 100
529
530 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
531
532 acpi_status
533 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
534 acpi_string * new_val)
535 {
536 if (!init_val || !new_val)
537 return AE_BAD_PARAMETER;
538
539 *new_val = NULL;
540 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
541 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
542 acpi_os_name);
543 *new_val = acpi_os_name;
544 }
545
546 return AE_OK;
547 }
548
549 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
550 #include <linux/earlycpio.h>
551 #include <linux/memblock.h>
552
553 static u64 acpi_tables_addr;
554 static int all_tables_size;
555
556 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
557 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
558 {
559 u8 sum = 0;
560 u8 *end = buffer + length;
561
562 while (buffer < end)
563 sum = (u8) (sum + *(buffer++));
564 return sum;
565 }
566
567 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
568 static const char * const table_sigs[] = {
569 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
570 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
571 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
572 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
573 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
574 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
575 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
576 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
577 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
578
579 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
580
581 #define ACPI_OVERRIDE_TABLES 64
582 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
583
584 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
585
586 void __init acpi_initrd_override(void *data, size_t size)
587 {
588 int sig, no, table_nr = 0, total_offset = 0;
589 long offset = 0;
590 struct acpi_table_header *table;
591 char cpio_path[32] = "kernel/firmware/acpi/";
592 struct cpio_data file;
593
594 if (data == NULL || size == 0)
595 return;
596
597 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
598 file = find_cpio_data(cpio_path, data, size, &offset);
599 if (!file.data)
600 break;
601
602 data += offset;
603 size -= offset;
604
605 if (file.size < sizeof(struct acpi_table_header)) {
606 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
607 cpio_path, file.name);
608 continue;
609 }
610
611 table = file.data;
612
613 for (sig = 0; table_sigs[sig]; sig++)
614 if (!memcmp(table->signature, table_sigs[sig], 4))
615 break;
616
617 if (!table_sigs[sig]) {
618 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
619 cpio_path, file.name);
620 continue;
621 }
622 if (file.size != table->length) {
623 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
624 cpio_path, file.name);
625 continue;
626 }
627 if (acpi_table_checksum(file.data, table->length)) {
628 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
629 cpio_path, file.name);
630 continue;
631 }
632
633 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
634 table->signature, cpio_path, file.name, table->length);
635
636 all_tables_size += table->length;
637 acpi_initrd_files[table_nr].data = file.data;
638 acpi_initrd_files[table_nr].size = file.size;
639 table_nr++;
640 }
641 if (table_nr == 0)
642 return;
643
644 acpi_tables_addr =
645 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
646 all_tables_size, PAGE_SIZE);
647 if (!acpi_tables_addr) {
648 WARN_ON(1);
649 return;
650 }
651 /*
652 * Only calling e820_add_reserve does not work and the
653 * tables are invalid (memory got used) later.
654 * memblock_reserve works as expected and the tables won't get modified.
655 * But it's not enough on X86 because ioremap will
656 * complain later (used by acpi_os_map_memory) that the pages
657 * that should get mapped are not marked "reserved".
658 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
659 * works fine.
660 */
661 memblock_reserve(acpi_tables_addr, all_tables_size);
662 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
663
664 /*
665 * early_ioremap only can remap 256k one time. If we map all
666 * tables one time, we will hit the limit. Need to map chunks
667 * one by one during copying the same as that in relocate_initrd().
668 */
669 for (no = 0; no < table_nr; no++) {
670 unsigned char *src_p = acpi_initrd_files[no].data;
671 phys_addr_t size = acpi_initrd_files[no].size;
672 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
673 phys_addr_t slop, clen;
674 char *dest_p;
675
676 total_offset += size;
677
678 while (size) {
679 slop = dest_addr & ~PAGE_MASK;
680 clen = size;
681 if (clen > MAP_CHUNK_SIZE - slop)
682 clen = MAP_CHUNK_SIZE - slop;
683 dest_p = early_ioremap(dest_addr & PAGE_MASK,
684 clen + slop);
685 memcpy(dest_p + slop, src_p, clen);
686 early_iounmap(dest_p, clen + slop);
687 src_p += clen;
688 dest_addr += clen;
689 size -= clen;
690 }
691 }
692 }
693 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
694
695 static void acpi_table_taint(struct acpi_table_header *table)
696 {
697 pr_warn(PREFIX
698 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
699 table->signature, table->oem_table_id);
700 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
701 }
702
703
704 acpi_status
705 acpi_os_table_override(struct acpi_table_header * existing_table,
706 struct acpi_table_header ** new_table)
707 {
708 if (!existing_table || !new_table)
709 return AE_BAD_PARAMETER;
710
711 *new_table = NULL;
712
713 #ifdef CONFIG_ACPI_CUSTOM_DSDT
714 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
715 *new_table = (struct acpi_table_header *)AmlCode;
716 #endif
717 if (*new_table != NULL)
718 acpi_table_taint(existing_table);
719 return AE_OK;
720 }
721
722 acpi_status
723 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
724 acpi_physical_address *address,
725 u32 *table_length)
726 {
727 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
728 *table_length = 0;
729 *address = 0;
730 return AE_OK;
731 #else
732 int table_offset = 0;
733 struct acpi_table_header *table;
734
735 *table_length = 0;
736 *address = 0;
737
738 if (!acpi_tables_addr)
739 return AE_OK;
740
741 do {
742 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
743 WARN_ON(1);
744 return AE_OK;
745 }
746
747 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
748 ACPI_HEADER_SIZE);
749
750 if (table_offset + table->length > all_tables_size) {
751 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
752 WARN_ON(1);
753 return AE_OK;
754 }
755
756 table_offset += table->length;
757
758 if (memcmp(existing_table->signature, table->signature, 4)) {
759 acpi_os_unmap_memory(table,
760 ACPI_HEADER_SIZE);
761 continue;
762 }
763
764 /* Only override tables with matching oem id */
765 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
766 ACPI_OEM_TABLE_ID_SIZE)) {
767 acpi_os_unmap_memory(table,
768 ACPI_HEADER_SIZE);
769 continue;
770 }
771
772 table_offset -= table->length;
773 *table_length = table->length;
774 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
775 *address = acpi_tables_addr + table_offset;
776 break;
777 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
778
779 if (*address != 0)
780 acpi_table_taint(existing_table);
781 return AE_OK;
782 #endif
783 }
784
785 static irqreturn_t acpi_irq(int irq, void *dev_id)
786 {
787 u32 handled;
788
789 handled = (*acpi_irq_handler) (acpi_irq_context);
790
791 if (handled) {
792 acpi_irq_handled++;
793 return IRQ_HANDLED;
794 } else {
795 acpi_irq_not_handled++;
796 return IRQ_NONE;
797 }
798 }
799
800 acpi_status
801 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
802 void *context)
803 {
804 unsigned int irq;
805
806 acpi_irq_stats_init();
807
808 /*
809 * ACPI interrupts different from the SCI in our copy of the FADT are
810 * not supported.
811 */
812 if (gsi != acpi_gbl_FADT.sci_interrupt)
813 return AE_BAD_PARAMETER;
814
815 if (acpi_irq_handler)
816 return AE_ALREADY_ACQUIRED;
817
818 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
819 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
820 gsi);
821 return AE_OK;
822 }
823
824 acpi_irq_handler = handler;
825 acpi_irq_context = context;
826 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
827 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
828 acpi_irq_handler = NULL;
829 return AE_NOT_ACQUIRED;
830 }
831
832 return AE_OK;
833 }
834
835 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
836 {
837 if (irq != acpi_gbl_FADT.sci_interrupt)
838 return AE_BAD_PARAMETER;
839
840 free_irq(irq, acpi_irq);
841 acpi_irq_handler = NULL;
842
843 return AE_OK;
844 }
845
846 /*
847 * Running in interpreter thread context, safe to sleep
848 */
849
850 void acpi_os_sleep(u64 ms)
851 {
852 msleep(ms);
853 }
854
855 void acpi_os_stall(u32 us)
856 {
857 while (us) {
858 u32 delay = 1000;
859
860 if (delay > us)
861 delay = us;
862 udelay(delay);
863 touch_nmi_watchdog();
864 us -= delay;
865 }
866 }
867
868 /*
869 * Support ACPI 3.0 AML Timer operand
870 * Returns 64-bit free-running, monotonically increasing timer
871 * with 100ns granularity
872 */
873 u64 acpi_os_get_timer(void)
874 {
875 u64 time_ns = ktime_to_ns(ktime_get());
876 do_div(time_ns, 100);
877 return time_ns;
878 }
879
880 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
881 {
882 u32 dummy;
883
884 if (!value)
885 value = &dummy;
886
887 *value = 0;
888 if (width <= 8) {
889 *(u8 *) value = inb(port);
890 } else if (width <= 16) {
891 *(u16 *) value = inw(port);
892 } else if (width <= 32) {
893 *(u32 *) value = inl(port);
894 } else {
895 BUG();
896 }
897
898 return AE_OK;
899 }
900
901 EXPORT_SYMBOL(acpi_os_read_port);
902
903 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
904 {
905 if (width <= 8) {
906 outb(value, port);
907 } else if (width <= 16) {
908 outw(value, port);
909 } else if (width <= 32) {
910 outl(value, port);
911 } else {
912 BUG();
913 }
914
915 return AE_OK;
916 }
917
918 EXPORT_SYMBOL(acpi_os_write_port);
919
920 #ifdef readq
921 static inline u64 read64(const volatile void __iomem *addr)
922 {
923 return readq(addr);
924 }
925 #else
926 static inline u64 read64(const volatile void __iomem *addr)
927 {
928 u64 l, h;
929 l = readl(addr);
930 h = readl(addr+4);
931 return l | (h << 32);
932 }
933 #endif
934
935 acpi_status
936 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
937 {
938 void __iomem *virt_addr;
939 unsigned int size = width / 8;
940 bool unmap = false;
941 u64 dummy;
942
943 rcu_read_lock();
944 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
945 if (!virt_addr) {
946 rcu_read_unlock();
947 virt_addr = acpi_os_ioremap(phys_addr, size);
948 if (!virt_addr)
949 return AE_BAD_ADDRESS;
950 unmap = true;
951 }
952
953 if (!value)
954 value = &dummy;
955
956 switch (width) {
957 case 8:
958 *(u8 *) value = readb(virt_addr);
959 break;
960 case 16:
961 *(u16 *) value = readw(virt_addr);
962 break;
963 case 32:
964 *(u32 *) value = readl(virt_addr);
965 break;
966 case 64:
967 *(u64 *) value = read64(virt_addr);
968 break;
969 default:
970 BUG();
971 }
972
973 if (unmap)
974 iounmap(virt_addr);
975 else
976 rcu_read_unlock();
977
978 return AE_OK;
979 }
980
981 #ifdef writeq
982 static inline void write64(u64 val, volatile void __iomem *addr)
983 {
984 writeq(val, addr);
985 }
986 #else
987 static inline void write64(u64 val, volatile void __iomem *addr)
988 {
989 writel(val, addr);
990 writel(val>>32, addr+4);
991 }
992 #endif
993
994 acpi_status
995 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
996 {
997 void __iomem *virt_addr;
998 unsigned int size = width / 8;
999 bool unmap = false;
1000
1001 rcu_read_lock();
1002 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1003 if (!virt_addr) {
1004 rcu_read_unlock();
1005 virt_addr = acpi_os_ioremap(phys_addr, size);
1006 if (!virt_addr)
1007 return AE_BAD_ADDRESS;
1008 unmap = true;
1009 }
1010
1011 switch (width) {
1012 case 8:
1013 writeb(value, virt_addr);
1014 break;
1015 case 16:
1016 writew(value, virt_addr);
1017 break;
1018 case 32:
1019 writel(value, virt_addr);
1020 break;
1021 case 64:
1022 write64(value, virt_addr);
1023 break;
1024 default:
1025 BUG();
1026 }
1027
1028 if (unmap)
1029 iounmap(virt_addr);
1030 else
1031 rcu_read_unlock();
1032
1033 return AE_OK;
1034 }
1035
1036 acpi_status
1037 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1038 u64 *value, u32 width)
1039 {
1040 int result, size;
1041 u32 value32;
1042
1043 if (!value)
1044 return AE_BAD_PARAMETER;
1045
1046 switch (width) {
1047 case 8:
1048 size = 1;
1049 break;
1050 case 16:
1051 size = 2;
1052 break;
1053 case 32:
1054 size = 4;
1055 break;
1056 default:
1057 return AE_ERROR;
1058 }
1059
1060 result = raw_pci_read(pci_id->segment, pci_id->bus,
1061 PCI_DEVFN(pci_id->device, pci_id->function),
1062 reg, size, &value32);
1063 *value = value32;
1064
1065 return (result ? AE_ERROR : AE_OK);
1066 }
1067
1068 acpi_status
1069 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1070 u64 value, u32 width)
1071 {
1072 int result, size;
1073
1074 switch (width) {
1075 case 8:
1076 size = 1;
1077 break;
1078 case 16:
1079 size = 2;
1080 break;
1081 case 32:
1082 size = 4;
1083 break;
1084 default:
1085 return AE_ERROR;
1086 }
1087
1088 result = raw_pci_write(pci_id->segment, pci_id->bus,
1089 PCI_DEVFN(pci_id->device, pci_id->function),
1090 reg, size, value);
1091
1092 return (result ? AE_ERROR : AE_OK);
1093 }
1094
1095 static void acpi_os_execute_deferred(struct work_struct *work)
1096 {
1097 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1098
1099 dpc->function(dpc->context);
1100 kfree(dpc);
1101 }
1102
1103 /*******************************************************************************
1104 *
1105 * FUNCTION: acpi_os_execute
1106 *
1107 * PARAMETERS: Type - Type of the callback
1108 * Function - Function to be executed
1109 * Context - Function parameters
1110 *
1111 * RETURN: Status
1112 *
1113 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1114 * immediately executes function on a separate thread.
1115 *
1116 ******************************************************************************/
1117
1118 acpi_status acpi_os_execute(acpi_execute_type type,
1119 acpi_osd_exec_callback function, void *context)
1120 {
1121 acpi_status status = AE_OK;
1122 struct acpi_os_dpc *dpc;
1123 struct workqueue_struct *queue;
1124 int ret;
1125 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1126 "Scheduling function [%p(%p)] for deferred execution.\n",
1127 function, context));
1128
1129 /*
1130 * Allocate/initialize DPC structure. Note that this memory will be
1131 * freed by the callee. The kernel handles the work_struct list in a
1132 * way that allows us to also free its memory inside the callee.
1133 * Because we may want to schedule several tasks with different
1134 * parameters we can't use the approach some kernel code uses of
1135 * having a static work_struct.
1136 */
1137
1138 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1139 if (!dpc)
1140 return AE_NO_MEMORY;
1141
1142 dpc->function = function;
1143 dpc->context = context;
1144
1145 /*
1146 * To prevent lockdep from complaining unnecessarily, make sure that
1147 * there is a different static lockdep key for each workqueue by using
1148 * INIT_WORK() for each of them separately.
1149 */
1150 if (type == OSL_NOTIFY_HANDLER) {
1151 queue = kacpi_notify_wq;
1152 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1153 } else {
1154 queue = kacpid_wq;
1155 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1156 }
1157
1158 /*
1159 * On some machines, a software-initiated SMI causes corruption unless
1160 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1161 * typically it's done in GPE-related methods that are run via
1162 * workqueues, so we can avoid the known corruption cases by always
1163 * queueing on CPU 0.
1164 */
1165 ret = queue_work_on(0, queue, &dpc->work);
1166
1167 if (!ret) {
1168 printk(KERN_ERR PREFIX
1169 "Call to queue_work() failed.\n");
1170 status = AE_ERROR;
1171 kfree(dpc);
1172 }
1173 return status;
1174 }
1175 EXPORT_SYMBOL(acpi_os_execute);
1176
1177 void acpi_os_wait_events_complete(void)
1178 {
1179 flush_workqueue(kacpid_wq);
1180 flush_workqueue(kacpi_notify_wq);
1181 }
1182
1183 struct acpi_hp_work {
1184 struct work_struct work;
1185 struct acpi_device *adev;
1186 u32 src;
1187 };
1188
1189 static void acpi_hotplug_work_fn(struct work_struct *work)
1190 {
1191 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1192
1193 acpi_os_wait_events_complete();
1194 acpi_device_hotplug(hpw->adev, hpw->src);
1195 kfree(hpw);
1196 }
1197
1198 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1199 {
1200 struct acpi_hp_work *hpw;
1201
1202 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1203 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1204 adev, src));
1205
1206 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1207 if (!hpw)
1208 return AE_NO_MEMORY;
1209
1210 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1211 hpw->adev = adev;
1212 hpw->src = src;
1213 /*
1214 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1215 * the hotplug code may call driver .remove() functions, which may
1216 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1217 * these workqueues.
1218 */
1219 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1220 kfree(hpw);
1221 return AE_ERROR;
1222 }
1223 return AE_OK;
1224 }
1225
1226 bool acpi_queue_hotplug_work(struct work_struct *work)
1227 {
1228 return queue_work(kacpi_hotplug_wq, work);
1229 }
1230
1231 acpi_status
1232 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1233 {
1234 struct semaphore *sem = NULL;
1235
1236 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1237 if (!sem)
1238 return AE_NO_MEMORY;
1239
1240 sema_init(sem, initial_units);
1241
1242 *handle = (acpi_handle *) sem;
1243
1244 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1245 *handle, initial_units));
1246
1247 return AE_OK;
1248 }
1249
1250 /*
1251 * TODO: A better way to delete semaphores? Linux doesn't have a
1252 * 'delete_semaphore()' function -- may result in an invalid
1253 * pointer dereference for non-synchronized consumers. Should
1254 * we at least check for blocked threads and signal/cancel them?
1255 */
1256
1257 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1258 {
1259 struct semaphore *sem = (struct semaphore *)handle;
1260
1261 if (!sem)
1262 return AE_BAD_PARAMETER;
1263
1264 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1265
1266 BUG_ON(!list_empty(&sem->wait_list));
1267 kfree(sem);
1268 sem = NULL;
1269
1270 return AE_OK;
1271 }
1272
1273 /*
1274 * TODO: Support for units > 1?
1275 */
1276 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1277 {
1278 acpi_status status = AE_OK;
1279 struct semaphore *sem = (struct semaphore *)handle;
1280 long jiffies;
1281 int ret = 0;
1282
1283 if (!sem || (units < 1))
1284 return AE_BAD_PARAMETER;
1285
1286 if (units > 1)
1287 return AE_SUPPORT;
1288
1289 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1290 handle, units, timeout));
1291
1292 if (timeout == ACPI_WAIT_FOREVER)
1293 jiffies = MAX_SCHEDULE_TIMEOUT;
1294 else
1295 jiffies = msecs_to_jiffies(timeout);
1296
1297 ret = down_timeout(sem, jiffies);
1298 if (ret)
1299 status = AE_TIME;
1300
1301 if (ACPI_FAILURE(status)) {
1302 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1303 "Failed to acquire semaphore[%p|%d|%d], %s",
1304 handle, units, timeout,
1305 acpi_format_exception(status)));
1306 } else {
1307 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1308 "Acquired semaphore[%p|%d|%d]", handle,
1309 units, timeout));
1310 }
1311
1312 return status;
1313 }
1314
1315 /*
1316 * TODO: Support for units > 1?
1317 */
1318 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1319 {
1320 struct semaphore *sem = (struct semaphore *)handle;
1321
1322 if (!sem || (units < 1))
1323 return AE_BAD_PARAMETER;
1324
1325 if (units > 1)
1326 return AE_SUPPORT;
1327
1328 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1329 units));
1330
1331 up(sem);
1332
1333 return AE_OK;
1334 }
1335
1336 #ifdef ACPI_FUTURE_USAGE
1337 u32 acpi_os_get_line(char *buffer)
1338 {
1339
1340 #ifdef ENABLE_DEBUGGER
1341 if (acpi_in_debugger) {
1342 u32 chars;
1343
1344 kdb_read(buffer, sizeof(line_buf));
1345
1346 /* remove the CR kdb includes */
1347 chars = strlen(buffer) - 1;
1348 buffer[chars] = '\0';
1349 }
1350 #endif
1351
1352 return 0;
1353 }
1354 #endif /* ACPI_FUTURE_USAGE */
1355
1356 acpi_status acpi_os_signal(u32 function, void *info)
1357 {
1358 switch (function) {
1359 case ACPI_SIGNAL_FATAL:
1360 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1361 break;
1362 case ACPI_SIGNAL_BREAKPOINT:
1363 /*
1364 * AML Breakpoint
1365 * ACPI spec. says to treat it as a NOP unless
1366 * you are debugging. So if/when we integrate
1367 * AML debugger into the kernel debugger its
1368 * hook will go here. But until then it is
1369 * not useful to print anything on breakpoints.
1370 */
1371 break;
1372 default:
1373 break;
1374 }
1375
1376 return AE_OK;
1377 }
1378
1379 static int __init acpi_os_name_setup(char *str)
1380 {
1381 char *p = acpi_os_name;
1382 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1383
1384 if (!str || !*str)
1385 return 0;
1386
1387 for (; count-- && *str; str++) {
1388 if (isalnum(*str) || *str == ' ' || *str == ':')
1389 *p++ = *str;
1390 else if (*str == '\'' || *str == '"')
1391 continue;
1392 else
1393 break;
1394 }
1395 *p = 0;
1396
1397 return 1;
1398
1399 }
1400
1401 __setup("acpi_os_name=", acpi_os_name_setup);
1402
1403 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1404 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1405
1406 struct osi_setup_entry {
1407 char string[OSI_STRING_LENGTH_MAX];
1408 bool enable;
1409 };
1410
1411 static struct osi_setup_entry
1412 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1413 {"Module Device", true},
1414 {"Processor Device", true},
1415 {"3.0 _SCP Extensions", true},
1416 {"Processor Aggregator Device", true},
1417 };
1418
1419 void __init acpi_osi_setup(char *str)
1420 {
1421 struct osi_setup_entry *osi;
1422 bool enable = true;
1423 int i;
1424
1425 if (!acpi_gbl_create_osi_method)
1426 return;
1427
1428 if (str == NULL || *str == '\0') {
1429 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1430 acpi_gbl_create_osi_method = FALSE;
1431 return;
1432 }
1433
1434 if (*str == '!') {
1435 str++;
1436 if (*str == '\0') {
1437 osi_linux.default_disabling = 1;
1438 return;
1439 } else if (*str == '*') {
1440 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1441 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1442 osi = &osi_setup_entries[i];
1443 osi->enable = false;
1444 }
1445 return;
1446 }
1447 enable = false;
1448 }
1449
1450 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1451 osi = &osi_setup_entries[i];
1452 if (!strcmp(osi->string, str)) {
1453 osi->enable = enable;
1454 break;
1455 } else if (osi->string[0] == '\0') {
1456 osi->enable = enable;
1457 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1458 break;
1459 }
1460 }
1461 }
1462
1463 static void __init set_osi_linux(unsigned int enable)
1464 {
1465 if (osi_linux.enable != enable)
1466 osi_linux.enable = enable;
1467
1468 if (osi_linux.enable)
1469 acpi_osi_setup("Linux");
1470 else
1471 acpi_osi_setup("!Linux");
1472
1473 return;
1474 }
1475
1476 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1477 {
1478 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1479 osi_linux.dmi = 0;
1480 set_osi_linux(enable);
1481
1482 return;
1483 }
1484
1485 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1486 {
1487 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1488
1489 if (enable == -1)
1490 return;
1491
1492 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1493 set_osi_linux(enable);
1494
1495 return;
1496 }
1497
1498 /*
1499 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1500 *
1501 * empty string disables _OSI
1502 * string starting with '!' disables that string
1503 * otherwise string is added to list, augmenting built-in strings
1504 */
1505 static void __init acpi_osi_setup_late(void)
1506 {
1507 struct osi_setup_entry *osi;
1508 char *str;
1509 int i;
1510 acpi_status status;
1511
1512 if (osi_linux.default_disabling) {
1513 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1514
1515 if (ACPI_SUCCESS(status))
1516 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1517 }
1518
1519 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1520 osi = &osi_setup_entries[i];
1521 str = osi->string;
1522
1523 if (*str == '\0')
1524 break;
1525 if (osi->enable) {
1526 status = acpi_install_interface(str);
1527
1528 if (ACPI_SUCCESS(status))
1529 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1530 } else {
1531 status = acpi_remove_interface(str);
1532
1533 if (ACPI_SUCCESS(status))
1534 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1535 }
1536 }
1537 }
1538
1539 static int __init osi_setup(char *str)
1540 {
1541 if (str && !strcmp("Linux", str))
1542 acpi_cmdline_osi_linux(1);
1543 else if (str && !strcmp("!Linux", str))
1544 acpi_cmdline_osi_linux(0);
1545 else
1546 acpi_osi_setup(str);
1547
1548 return 1;
1549 }
1550
1551 __setup("acpi_osi=", osi_setup);
1552
1553 /*
1554 * Disable the auto-serialization of named objects creation methods.
1555 *
1556 * This feature is enabled by default. It marks the AML control methods
1557 * that contain the opcodes to create named objects as "Serialized".
1558 */
1559 static int __init acpi_no_auto_serialize_setup(char *str)
1560 {
1561 acpi_gbl_auto_serialize_methods = FALSE;
1562 pr_info("ACPI: auto-serialization disabled\n");
1563
1564 return 1;
1565 }
1566
1567 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1568
1569 /* Check of resource interference between native drivers and ACPI
1570 * OperationRegions (SystemIO and System Memory only).
1571 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1572 * in arbitrary AML code and can interfere with legacy drivers.
1573 * acpi_enforce_resources= can be set to:
1574 *
1575 * - strict (default) (2)
1576 * -> further driver trying to access the resources will not load
1577 * - lax (1)
1578 * -> further driver trying to access the resources will load, but you
1579 * get a system message that something might go wrong...
1580 *
1581 * - no (0)
1582 * -> ACPI Operation Region resources will not be registered
1583 *
1584 */
1585 #define ENFORCE_RESOURCES_STRICT 2
1586 #define ENFORCE_RESOURCES_LAX 1
1587 #define ENFORCE_RESOURCES_NO 0
1588
1589 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1590
1591 static int __init acpi_enforce_resources_setup(char *str)
1592 {
1593 if (str == NULL || *str == '\0')
1594 return 0;
1595
1596 if (!strcmp("strict", str))
1597 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1598 else if (!strcmp("lax", str))
1599 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1600 else if (!strcmp("no", str))
1601 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1602
1603 return 1;
1604 }
1605
1606 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1607
1608 /* Check for resource conflicts between ACPI OperationRegions and native
1609 * drivers */
1610 int acpi_check_resource_conflict(const struct resource *res)
1611 {
1612 acpi_adr_space_type space_id;
1613 acpi_size length;
1614 u8 warn = 0;
1615 int clash = 0;
1616
1617 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1618 return 0;
1619 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1620 return 0;
1621
1622 if (res->flags & IORESOURCE_IO)
1623 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1624 else
1625 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1626
1627 length = resource_size(res);
1628 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1629 warn = 1;
1630 clash = acpi_check_address_range(space_id, res->start, length, warn);
1631
1632 if (clash) {
1633 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1634 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1635 printk(KERN_NOTICE "ACPI: This conflict may"
1636 " cause random problems and system"
1637 " instability\n");
1638 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1639 " for this device, you should use it instead of"
1640 " the native driver\n");
1641 }
1642 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1643 return -EBUSY;
1644 }
1645 return 0;
1646 }
1647 EXPORT_SYMBOL(acpi_check_resource_conflict);
1648
1649 int acpi_check_region(resource_size_t start, resource_size_t n,
1650 const char *name)
1651 {
1652 struct resource res = {
1653 .start = start,
1654 .end = start + n - 1,
1655 .name = name,
1656 .flags = IORESOURCE_IO,
1657 };
1658
1659 return acpi_check_resource_conflict(&res);
1660 }
1661 EXPORT_SYMBOL(acpi_check_region);
1662
1663 /*
1664 * Let drivers know whether the resource checks are effective
1665 */
1666 int acpi_resources_are_enforced(void)
1667 {
1668 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1669 }
1670 EXPORT_SYMBOL(acpi_resources_are_enforced);
1671
1672 /*
1673 * Deallocate the memory for a spinlock.
1674 */
1675 void acpi_os_delete_lock(acpi_spinlock handle)
1676 {
1677 ACPI_FREE(handle);
1678 }
1679
1680 /*
1681 * Acquire a spinlock.
1682 *
1683 * handle is a pointer to the spinlock_t.
1684 */
1685
1686 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1687 {
1688 acpi_cpu_flags flags;
1689 spin_lock_irqsave(lockp, flags);
1690 return flags;
1691 }
1692
1693 /*
1694 * Release a spinlock. See above.
1695 */
1696
1697 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1698 {
1699 spin_unlock_irqrestore(lockp, flags);
1700 }
1701
1702 #ifndef ACPI_USE_LOCAL_CACHE
1703
1704 /*******************************************************************************
1705 *
1706 * FUNCTION: acpi_os_create_cache
1707 *
1708 * PARAMETERS: name - Ascii name for the cache
1709 * size - Size of each cached object
1710 * depth - Maximum depth of the cache (in objects) <ignored>
1711 * cache - Where the new cache object is returned
1712 *
1713 * RETURN: status
1714 *
1715 * DESCRIPTION: Create a cache object
1716 *
1717 ******************************************************************************/
1718
1719 acpi_status
1720 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1721 {
1722 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1723 if (*cache == NULL)
1724 return AE_ERROR;
1725 else
1726 return AE_OK;
1727 }
1728
1729 /*******************************************************************************
1730 *
1731 * FUNCTION: acpi_os_purge_cache
1732 *
1733 * PARAMETERS: Cache - Handle to cache object
1734 *
1735 * RETURN: Status
1736 *
1737 * DESCRIPTION: Free all objects within the requested cache.
1738 *
1739 ******************************************************************************/
1740
1741 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1742 {
1743 kmem_cache_shrink(cache);
1744 return (AE_OK);
1745 }
1746
1747 /*******************************************************************************
1748 *
1749 * FUNCTION: acpi_os_delete_cache
1750 *
1751 * PARAMETERS: Cache - Handle to cache object
1752 *
1753 * RETURN: Status
1754 *
1755 * DESCRIPTION: Free all objects within the requested cache and delete the
1756 * cache object.
1757 *
1758 ******************************************************************************/
1759
1760 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1761 {
1762 kmem_cache_destroy(cache);
1763 return (AE_OK);
1764 }
1765
1766 /*******************************************************************************
1767 *
1768 * FUNCTION: acpi_os_release_object
1769 *
1770 * PARAMETERS: Cache - Handle to cache object
1771 * Object - The object to be released
1772 *
1773 * RETURN: None
1774 *
1775 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1776 * the object is deleted.
1777 *
1778 ******************************************************************************/
1779
1780 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1781 {
1782 kmem_cache_free(cache, object);
1783 return (AE_OK);
1784 }
1785 #endif
1786
1787 static int __init acpi_no_static_ssdt_setup(char *s)
1788 {
1789 acpi_gbl_disable_ssdt_table_install = TRUE;
1790 pr_info("ACPI: static SSDT installation disabled\n");
1791
1792 return 0;
1793 }
1794
1795 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1796
1797 static int __init acpi_disable_return_repair(char *s)
1798 {
1799 printk(KERN_NOTICE PREFIX
1800 "ACPI: Predefined validation mechanism disabled\n");
1801 acpi_gbl_disable_auto_repair = TRUE;
1802
1803 return 1;
1804 }
1805
1806 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1807
1808 acpi_status __init acpi_os_initialize(void)
1809 {
1810 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1811 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1812 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1813 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1814 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1815 /*
1816 * Use acpi_os_map_generic_address to pre-map the reset
1817 * register if it's in system memory.
1818 */
1819 int rv;
1820
1821 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1822 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1823 }
1824
1825 return AE_OK;
1826 }
1827
1828 acpi_status __init acpi_os_initialize1(void)
1829 {
1830 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1831 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1832 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1833 BUG_ON(!kacpid_wq);
1834 BUG_ON(!kacpi_notify_wq);
1835 BUG_ON(!kacpi_hotplug_wq);
1836 acpi_install_interface_handler(acpi_osi_handler);
1837 acpi_osi_setup_late();
1838 return AE_OK;
1839 }
1840
1841 acpi_status acpi_os_terminate(void)
1842 {
1843 if (acpi_irq_handler) {
1844 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1845 acpi_irq_handler);
1846 }
1847
1848 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1849 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1850 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1851 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1852 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1853 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1854
1855 destroy_workqueue(kacpid_wq);
1856 destroy_workqueue(kacpi_notify_wq);
1857 destroy_workqueue(kacpi_hotplug_wq);
1858
1859 return AE_OK;
1860 }
1861
1862 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1863 u32 pm1b_control)
1864 {
1865 int rc = 0;
1866 if (__acpi_os_prepare_sleep)
1867 rc = __acpi_os_prepare_sleep(sleep_state,
1868 pm1a_control, pm1b_control);
1869 if (rc < 0)
1870 return AE_ERROR;
1871 else if (rc > 0)
1872 return AE_CTRL_SKIP;
1873
1874 return AE_OK;
1875 }
1876
1877 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1878 u32 pm1a_ctrl, u32 pm1b_ctrl))
1879 {
1880 __acpi_os_prepare_sleep = func;
1881 }
1882
1883 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1884 u32 val_b)
1885 {
1886 int rc = 0;
1887 if (__acpi_os_prepare_extended_sleep)
1888 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1889 val_a, val_b);
1890 if (rc < 0)
1891 return AE_ERROR;
1892 else if (rc > 0)
1893 return AE_CTRL_SKIP;
1894
1895 return AE_OK;
1896 }
1897
1898 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1899 u32 val_a, u32 val_b))
1900 {
1901 __acpi_os_prepare_extended_sleep = func;
1902 }
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