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Staging: Merge branch 'tidspbridge-for-2.6.39' of git://dev.omapzoom.org/pub/scm...
[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/pci.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.h>
40 #include <linux/acpi.h>
41 #include <linux/acpi_io.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 <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
54
55 #define _COMPONENT ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX "ACPI: "
58 struct acpi_os_dpc {
59 acpi_osd_exec_callback function;
60 void *context;
61 struct work_struct work;
62 int wait;
63 };
64
65 #ifdef CONFIG_ACPI_CUSTOM_DSDT
66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
67 #endif
68
69 #ifdef ENABLE_DEBUGGER
70 #include <linux/kdb.h>
71
72 /* stuff for debugger support */
73 int acpi_in_debugger;
74 EXPORT_SYMBOL(acpi_in_debugger);
75
76 extern char line_buf[80];
77 #endif /*ENABLE_DEBUGGER */
78
79 static unsigned int acpi_irq_irq;
80 static acpi_osd_handler acpi_irq_handler;
81 static void *acpi_irq_context;
82 static struct workqueue_struct *kacpid_wq;
83 static struct workqueue_struct *kacpi_notify_wq;
84 static struct workqueue_struct *kacpi_hotplug_wq;
85
86 struct acpi_res_list {
87 resource_size_t start;
88 resource_size_t end;
89 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
90 char name[5]; /* only can have a length of 4 chars, make use of this
91 one instead of res->name, no need to kalloc then */
92 struct list_head resource_list;
93 int count;
94 };
95
96 static LIST_HEAD(resource_list_head);
97 static DEFINE_SPINLOCK(acpi_res_lock);
98
99 /*
100 * This list of permanent mappings is for memory that may be accessed from
101 * interrupt context, where we can't do the ioremap().
102 */
103 struct acpi_ioremap {
104 struct list_head list;
105 void __iomem *virt;
106 acpi_physical_address phys;
107 acpi_size size;
108 struct kref ref;
109 };
110
111 static LIST_HEAD(acpi_ioremaps);
112 static DEFINE_SPINLOCK(acpi_ioremap_lock);
113
114 static void __init acpi_osi_setup_late(void);
115
116 /*
117 * The story of _OSI(Linux)
118 *
119 * From pre-history through Linux-2.6.22,
120 * Linux responded TRUE upon a BIOS OSI(Linux) query.
121 *
122 * Unfortunately, reference BIOS writers got wind of this
123 * and put OSI(Linux) in their example code, quickly exposing
124 * this string as ill-conceived and opening the door to
125 * an un-bounded number of BIOS incompatibilities.
126 *
127 * For example, OSI(Linux) was used on resume to re-POST a
128 * video card on one system, because Linux at that time
129 * could not do a speedy restore in its native driver.
130 * But then upon gaining quick native restore capability,
131 * Linux has no way to tell the BIOS to skip the time-consuming
132 * POST -- putting Linux at a permanent performance disadvantage.
133 * On another system, the BIOS writer used OSI(Linux)
134 * to infer native OS support for IPMI! On other systems,
135 * OSI(Linux) simply got in the way of Linux claiming to
136 * be compatible with other operating systems, exposing
137 * BIOS issues such as skipped device initialization.
138 *
139 * So "Linux" turned out to be a really poor chose of
140 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
141 *
142 * BIOS writers should NOT query _OSI(Linux) on future systems.
143 * Linux will complain on the console when it sees it, and return FALSE.
144 * To get Linux to return TRUE for your system will require
145 * a kernel source update to add a DMI entry,
146 * or boot with "acpi_osi=Linux"
147 */
148
149 static struct osi_linux {
150 unsigned int enable:1;
151 unsigned int dmi:1;
152 unsigned int cmdline:1;
153 } osi_linux = {0, 0, 0};
154
155 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
156 {
157 if (!strcmp("Linux", interface)) {
158
159 printk(KERN_NOTICE FW_BUG PREFIX
160 "BIOS _OSI(Linux) query %s%s\n",
161 osi_linux.enable ? "honored" : "ignored",
162 osi_linux.cmdline ? " via cmdline" :
163 osi_linux.dmi ? " via DMI" : "");
164 }
165
166 return supported;
167 }
168
169 static void __init acpi_request_region (struct acpi_generic_address *addr,
170 unsigned int length, char *desc)
171 {
172 if (!addr->address || !length)
173 return;
174
175 /* Resources are never freed */
176 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
177 request_region(addr->address, length, desc);
178 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
179 request_mem_region(addr->address, length, desc);
180 }
181
182 static int __init acpi_reserve_resources(void)
183 {
184 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
185 "ACPI PM1a_EVT_BLK");
186
187 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
188 "ACPI PM1b_EVT_BLK");
189
190 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
191 "ACPI PM1a_CNT_BLK");
192
193 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
194 "ACPI PM1b_CNT_BLK");
195
196 if (acpi_gbl_FADT.pm_timer_length == 4)
197 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
198
199 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
200 "ACPI PM2_CNT_BLK");
201
202 /* Length of GPE blocks must be a non-negative multiple of 2 */
203
204 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
205 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
206 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
207
208 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
209 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
210 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
211
212 return 0;
213 }
214 device_initcall(acpi_reserve_resources);
215
216 void acpi_os_printf(const char *fmt, ...)
217 {
218 va_list args;
219 va_start(args, fmt);
220 acpi_os_vprintf(fmt, args);
221 va_end(args);
222 }
223
224 void acpi_os_vprintf(const char *fmt, va_list args)
225 {
226 static char buffer[512];
227
228 vsprintf(buffer, fmt, args);
229
230 #ifdef ENABLE_DEBUGGER
231 if (acpi_in_debugger) {
232 kdb_printf("%s", buffer);
233 } else {
234 printk(KERN_CONT "%s", buffer);
235 }
236 #else
237 printk(KERN_CONT "%s", buffer);
238 #endif
239 }
240
241 acpi_physical_address __init acpi_os_get_root_pointer(void)
242 {
243 if (efi_enabled) {
244 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
245 return efi.acpi20;
246 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
247 return efi.acpi;
248 else {
249 printk(KERN_ERR PREFIX
250 "System description tables not found\n");
251 return 0;
252 }
253 } else {
254 acpi_physical_address pa = 0;
255
256 acpi_find_root_pointer(&pa);
257 return pa;
258 }
259 }
260
261 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
262 static struct acpi_ioremap *
263 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
264 {
265 struct acpi_ioremap *map;
266
267 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
268 if (map->phys <= phys &&
269 phys + size <= map->phys + map->size)
270 return map;
271
272 return NULL;
273 }
274
275 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
276 static void __iomem *
277 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
278 {
279 struct acpi_ioremap *map;
280
281 map = acpi_map_lookup(phys, size);
282 if (map)
283 return map->virt + (phys - map->phys);
284
285 return NULL;
286 }
287
288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
289 static struct acpi_ioremap *
290 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
291 {
292 struct acpi_ioremap *map;
293
294 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
295 if (map->virt <= virt &&
296 virt + size <= map->virt + map->size)
297 return map;
298
299 return NULL;
300 }
301
302 void __iomem *__init_refok
303 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
304 {
305 struct acpi_ioremap *map, *tmp_map;
306 unsigned long flags;
307 void __iomem *virt;
308 acpi_physical_address pg_off;
309 acpi_size pg_sz;
310
311 if (phys > ULONG_MAX) {
312 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
313 return NULL;
314 }
315
316 if (!acpi_gbl_permanent_mmap)
317 return __acpi_map_table((unsigned long)phys, size);
318
319 map = kzalloc(sizeof(*map), GFP_KERNEL);
320 if (!map)
321 return NULL;
322
323 pg_off = round_down(phys, PAGE_SIZE);
324 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
325 virt = acpi_os_ioremap(pg_off, pg_sz);
326 if (!virt) {
327 kfree(map);
328 return NULL;
329 }
330
331 INIT_LIST_HEAD(&map->list);
332 map->virt = virt;
333 map->phys = pg_off;
334 map->size = pg_sz;
335 kref_init(&map->ref);
336
337 spin_lock_irqsave(&acpi_ioremap_lock, flags);
338 /* Check if page has already been mapped. */
339 tmp_map = acpi_map_lookup(phys, size);
340 if (tmp_map) {
341 kref_get(&tmp_map->ref);
342 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
343 iounmap(map->virt);
344 kfree(map);
345 return tmp_map->virt + (phys - tmp_map->phys);
346 }
347 list_add_tail_rcu(&map->list, &acpi_ioremaps);
348 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
349
350 return map->virt + (phys - map->phys);
351 }
352 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
353
354 static void acpi_kref_del_iomap(struct kref *ref)
355 {
356 struct acpi_ioremap *map;
357
358 map = container_of(ref, struct acpi_ioremap, ref);
359 list_del_rcu(&map->list);
360 }
361
362 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
363 {
364 struct acpi_ioremap *map;
365 unsigned long flags;
366 int del;
367
368 if (!acpi_gbl_permanent_mmap) {
369 __acpi_unmap_table(virt, size);
370 return;
371 }
372
373 spin_lock_irqsave(&acpi_ioremap_lock, flags);
374 map = acpi_map_lookup_virt(virt, size);
375 if (!map) {
376 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
377 printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt);
378 dump_stack();
379 return;
380 }
381
382 del = kref_put(&map->ref, acpi_kref_del_iomap);
383 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
384
385 if (!del)
386 return;
387
388 synchronize_rcu();
389 iounmap(map->virt);
390 kfree(map);
391 }
392 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
393
394 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
395 {
396 if (!acpi_gbl_permanent_mmap)
397 __acpi_unmap_table(virt, size);
398 }
399
400 int acpi_os_map_generic_address(struct acpi_generic_address *addr)
401 {
402 void __iomem *virt;
403
404 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
405 return 0;
406
407 if (!addr->address || !addr->bit_width)
408 return -EINVAL;
409
410 virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
411 if (!virt)
412 return -EIO;
413
414 return 0;
415 }
416 EXPORT_SYMBOL_GPL(acpi_os_map_generic_address);
417
418 void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
419 {
420 void __iomem *virt;
421 unsigned long flags;
422 acpi_size size = addr->bit_width / 8;
423
424 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
425 return;
426
427 if (!addr->address || !addr->bit_width)
428 return;
429
430 spin_lock_irqsave(&acpi_ioremap_lock, flags);
431 virt = acpi_map_vaddr_lookup(addr->address, size);
432 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
433
434 acpi_os_unmap_memory(virt, size);
435 }
436 EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address);
437
438 #ifdef ACPI_FUTURE_USAGE
439 acpi_status
440 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
441 {
442 if (!phys || !virt)
443 return AE_BAD_PARAMETER;
444
445 *phys = virt_to_phys(virt);
446
447 return AE_OK;
448 }
449 #endif
450
451 #define ACPI_MAX_OVERRIDE_LEN 100
452
453 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
454
455 acpi_status
456 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
457 acpi_string * new_val)
458 {
459 if (!init_val || !new_val)
460 return AE_BAD_PARAMETER;
461
462 *new_val = NULL;
463 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
464 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
465 acpi_os_name);
466 *new_val = acpi_os_name;
467 }
468
469 return AE_OK;
470 }
471
472 acpi_status
473 acpi_os_table_override(struct acpi_table_header * existing_table,
474 struct acpi_table_header ** new_table)
475 {
476 if (!existing_table || !new_table)
477 return AE_BAD_PARAMETER;
478
479 *new_table = NULL;
480
481 #ifdef CONFIG_ACPI_CUSTOM_DSDT
482 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
483 *new_table = (struct acpi_table_header *)AmlCode;
484 #endif
485 if (*new_table != NULL) {
486 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
487 "this is unsafe: tainting kernel\n",
488 existing_table->signature,
489 existing_table->oem_table_id);
490 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
491 }
492 return AE_OK;
493 }
494
495 static irqreturn_t acpi_irq(int irq, void *dev_id)
496 {
497 u32 handled;
498
499 handled = (*acpi_irq_handler) (acpi_irq_context);
500
501 if (handled) {
502 acpi_irq_handled++;
503 return IRQ_HANDLED;
504 } else {
505 acpi_irq_not_handled++;
506 return IRQ_NONE;
507 }
508 }
509
510 acpi_status
511 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
512 void *context)
513 {
514 unsigned int irq;
515
516 acpi_irq_stats_init();
517
518 /*
519 * Ignore the GSI from the core, and use the value in our copy of the
520 * FADT. It may not be the same if an interrupt source override exists
521 * for the SCI.
522 */
523 gsi = acpi_gbl_FADT.sci_interrupt;
524 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
525 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
526 gsi);
527 return AE_OK;
528 }
529
530 acpi_irq_handler = handler;
531 acpi_irq_context = context;
532 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
533 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
534 return AE_NOT_ACQUIRED;
535 }
536 acpi_irq_irq = irq;
537
538 return AE_OK;
539 }
540
541 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
542 {
543 if (irq) {
544 free_irq(irq, acpi_irq);
545 acpi_irq_handler = NULL;
546 acpi_irq_irq = 0;
547 }
548
549 return AE_OK;
550 }
551
552 /*
553 * Running in interpreter thread context, safe to sleep
554 */
555
556 void acpi_os_sleep(u64 ms)
557 {
558 schedule_timeout_interruptible(msecs_to_jiffies(ms));
559 }
560
561 void acpi_os_stall(u32 us)
562 {
563 while (us) {
564 u32 delay = 1000;
565
566 if (delay > us)
567 delay = us;
568 udelay(delay);
569 touch_nmi_watchdog();
570 us -= delay;
571 }
572 }
573
574 /*
575 * Support ACPI 3.0 AML Timer operand
576 * Returns 64-bit free-running, monotonically increasing timer
577 * with 100ns granularity
578 */
579 u64 acpi_os_get_timer(void)
580 {
581 static u64 t;
582
583 #ifdef CONFIG_HPET
584 /* TBD: use HPET if available */
585 #endif
586
587 #ifdef CONFIG_X86_PM_TIMER
588 /* TBD: default to PM timer if HPET was not available */
589 #endif
590 if (!t)
591 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
592
593 return ++t;
594 }
595
596 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
597 {
598 u32 dummy;
599
600 if (!value)
601 value = &dummy;
602
603 *value = 0;
604 if (width <= 8) {
605 *(u8 *) value = inb(port);
606 } else if (width <= 16) {
607 *(u16 *) value = inw(port);
608 } else if (width <= 32) {
609 *(u32 *) value = inl(port);
610 } else {
611 BUG();
612 }
613
614 return AE_OK;
615 }
616
617 EXPORT_SYMBOL(acpi_os_read_port);
618
619 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
620 {
621 if (width <= 8) {
622 outb(value, port);
623 } else if (width <= 16) {
624 outw(value, port);
625 } else if (width <= 32) {
626 outl(value, port);
627 } else {
628 BUG();
629 }
630
631 return AE_OK;
632 }
633
634 EXPORT_SYMBOL(acpi_os_write_port);
635
636 acpi_status
637 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
638 {
639 u32 dummy;
640 void __iomem *virt_addr;
641 int size = width / 8, unmap = 0;
642
643 rcu_read_lock();
644 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
645 rcu_read_unlock();
646 if (!virt_addr) {
647 virt_addr = acpi_os_ioremap(phys_addr, size);
648 unmap = 1;
649 }
650 if (!value)
651 value = &dummy;
652
653 switch (width) {
654 case 8:
655 *(u8 *) value = readb(virt_addr);
656 break;
657 case 16:
658 *(u16 *) value = readw(virt_addr);
659 break;
660 case 32:
661 *(u32 *) value = readl(virt_addr);
662 break;
663 default:
664 BUG();
665 }
666
667 if (unmap)
668 iounmap(virt_addr);
669
670 return AE_OK;
671 }
672
673 acpi_status
674 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
675 {
676 void __iomem *virt_addr;
677 int size = width / 8, unmap = 0;
678
679 rcu_read_lock();
680 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
681 rcu_read_unlock();
682 if (!virt_addr) {
683 virt_addr = acpi_os_ioremap(phys_addr, size);
684 unmap = 1;
685 }
686
687 switch (width) {
688 case 8:
689 writeb(value, virt_addr);
690 break;
691 case 16:
692 writew(value, virt_addr);
693 break;
694 case 32:
695 writel(value, virt_addr);
696 break;
697 default:
698 BUG();
699 }
700
701 if (unmap)
702 iounmap(virt_addr);
703
704 return AE_OK;
705 }
706
707 acpi_status
708 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
709 u64 *value, u32 width)
710 {
711 int result, size;
712 u32 value32;
713
714 if (!value)
715 return AE_BAD_PARAMETER;
716
717 switch (width) {
718 case 8:
719 size = 1;
720 break;
721 case 16:
722 size = 2;
723 break;
724 case 32:
725 size = 4;
726 break;
727 default:
728 return AE_ERROR;
729 }
730
731 result = raw_pci_read(pci_id->segment, pci_id->bus,
732 PCI_DEVFN(pci_id->device, pci_id->function),
733 reg, size, &value32);
734 *value = value32;
735
736 return (result ? AE_ERROR : AE_OK);
737 }
738
739 acpi_status
740 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
741 u64 value, u32 width)
742 {
743 int result, size;
744
745 switch (width) {
746 case 8:
747 size = 1;
748 break;
749 case 16:
750 size = 2;
751 break;
752 case 32:
753 size = 4;
754 break;
755 default:
756 return AE_ERROR;
757 }
758
759 result = raw_pci_write(pci_id->segment, pci_id->bus,
760 PCI_DEVFN(pci_id->device, pci_id->function),
761 reg, size, value);
762
763 return (result ? AE_ERROR : AE_OK);
764 }
765
766 static void acpi_os_execute_deferred(struct work_struct *work)
767 {
768 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
769
770 if (dpc->wait)
771 acpi_os_wait_events_complete(NULL);
772
773 dpc->function(dpc->context);
774 kfree(dpc);
775 }
776
777 /*******************************************************************************
778 *
779 * FUNCTION: acpi_os_execute
780 *
781 * PARAMETERS: Type - Type of the callback
782 * Function - Function to be executed
783 * Context - Function parameters
784 *
785 * RETURN: Status
786 *
787 * DESCRIPTION: Depending on type, either queues function for deferred execution or
788 * immediately executes function on a separate thread.
789 *
790 ******************************************************************************/
791
792 static acpi_status __acpi_os_execute(acpi_execute_type type,
793 acpi_osd_exec_callback function, void *context, int hp)
794 {
795 acpi_status status = AE_OK;
796 struct acpi_os_dpc *dpc;
797 struct workqueue_struct *queue;
798 int ret;
799 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
800 "Scheduling function [%p(%p)] for deferred execution.\n",
801 function, context));
802
803 /*
804 * Allocate/initialize DPC structure. Note that this memory will be
805 * freed by the callee. The kernel handles the work_struct list in a
806 * way that allows us to also free its memory inside the callee.
807 * Because we may want to schedule several tasks with different
808 * parameters we can't use the approach some kernel code uses of
809 * having a static work_struct.
810 */
811
812 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
813 if (!dpc)
814 return AE_NO_MEMORY;
815
816 dpc->function = function;
817 dpc->context = context;
818
819 /*
820 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
821 * because the hotplug code may call driver .remove() functions,
822 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
823 * to flush these workqueues.
824 */
825 queue = hp ? kacpi_hotplug_wq :
826 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
827 dpc->wait = hp ? 1 : 0;
828
829 if (queue == kacpi_hotplug_wq)
830 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
831 else if (queue == kacpi_notify_wq)
832 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
833 else
834 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
835
836 /*
837 * On some machines, a software-initiated SMI causes corruption unless
838 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
839 * typically it's done in GPE-related methods that are run via
840 * workqueues, so we can avoid the known corruption cases by always
841 * queueing on CPU 0.
842 */
843 ret = queue_work_on(0, queue, &dpc->work);
844
845 if (!ret) {
846 printk(KERN_ERR PREFIX
847 "Call to queue_work() failed.\n");
848 status = AE_ERROR;
849 kfree(dpc);
850 }
851 return status;
852 }
853
854 acpi_status acpi_os_execute(acpi_execute_type type,
855 acpi_osd_exec_callback function, void *context)
856 {
857 return __acpi_os_execute(type, function, context, 0);
858 }
859 EXPORT_SYMBOL(acpi_os_execute);
860
861 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
862 void *context)
863 {
864 return __acpi_os_execute(0, function, context, 1);
865 }
866
867 void acpi_os_wait_events_complete(void *context)
868 {
869 flush_workqueue(kacpid_wq);
870 flush_workqueue(kacpi_notify_wq);
871 }
872
873 EXPORT_SYMBOL(acpi_os_wait_events_complete);
874
875 /*
876 * Deallocate the memory for a spinlock.
877 */
878 void acpi_os_delete_lock(acpi_spinlock handle)
879 {
880 return;
881 }
882
883 acpi_status
884 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
885 {
886 struct semaphore *sem = NULL;
887
888 sem = acpi_os_allocate(sizeof(struct semaphore));
889 if (!sem)
890 return AE_NO_MEMORY;
891 memset(sem, 0, sizeof(struct semaphore));
892
893 sema_init(sem, initial_units);
894
895 *handle = (acpi_handle *) sem;
896
897 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
898 *handle, initial_units));
899
900 return AE_OK;
901 }
902
903 /*
904 * TODO: A better way to delete semaphores? Linux doesn't have a
905 * 'delete_semaphore()' function -- may result in an invalid
906 * pointer dereference for non-synchronized consumers. Should
907 * we at least check for blocked threads and signal/cancel them?
908 */
909
910 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
911 {
912 struct semaphore *sem = (struct semaphore *)handle;
913
914 if (!sem)
915 return AE_BAD_PARAMETER;
916
917 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
918
919 BUG_ON(!list_empty(&sem->wait_list));
920 kfree(sem);
921 sem = NULL;
922
923 return AE_OK;
924 }
925
926 /*
927 * TODO: Support for units > 1?
928 */
929 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
930 {
931 acpi_status status = AE_OK;
932 struct semaphore *sem = (struct semaphore *)handle;
933 long jiffies;
934 int ret = 0;
935
936 if (!sem || (units < 1))
937 return AE_BAD_PARAMETER;
938
939 if (units > 1)
940 return AE_SUPPORT;
941
942 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
943 handle, units, timeout));
944
945 if (timeout == ACPI_WAIT_FOREVER)
946 jiffies = MAX_SCHEDULE_TIMEOUT;
947 else
948 jiffies = msecs_to_jiffies(timeout);
949
950 ret = down_timeout(sem, jiffies);
951 if (ret)
952 status = AE_TIME;
953
954 if (ACPI_FAILURE(status)) {
955 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
956 "Failed to acquire semaphore[%p|%d|%d], %s",
957 handle, units, timeout,
958 acpi_format_exception(status)));
959 } else {
960 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
961 "Acquired semaphore[%p|%d|%d]", handle,
962 units, timeout));
963 }
964
965 return status;
966 }
967
968 /*
969 * TODO: Support for units > 1?
970 */
971 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
972 {
973 struct semaphore *sem = (struct semaphore *)handle;
974
975 if (!sem || (units < 1))
976 return AE_BAD_PARAMETER;
977
978 if (units > 1)
979 return AE_SUPPORT;
980
981 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
982 units));
983
984 up(sem);
985
986 return AE_OK;
987 }
988
989 #ifdef ACPI_FUTURE_USAGE
990 u32 acpi_os_get_line(char *buffer)
991 {
992
993 #ifdef ENABLE_DEBUGGER
994 if (acpi_in_debugger) {
995 u32 chars;
996
997 kdb_read(buffer, sizeof(line_buf));
998
999 /* remove the CR kdb includes */
1000 chars = strlen(buffer) - 1;
1001 buffer[chars] = '\0';
1002 }
1003 #endif
1004
1005 return 0;
1006 }
1007 #endif /* ACPI_FUTURE_USAGE */
1008
1009 acpi_status acpi_os_signal(u32 function, void *info)
1010 {
1011 switch (function) {
1012 case ACPI_SIGNAL_FATAL:
1013 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1014 break;
1015 case ACPI_SIGNAL_BREAKPOINT:
1016 /*
1017 * AML Breakpoint
1018 * ACPI spec. says to treat it as a NOP unless
1019 * you are debugging. So if/when we integrate
1020 * AML debugger into the kernel debugger its
1021 * hook will go here. But until then it is
1022 * not useful to print anything on breakpoints.
1023 */
1024 break;
1025 default:
1026 break;
1027 }
1028
1029 return AE_OK;
1030 }
1031
1032 static int __init acpi_os_name_setup(char *str)
1033 {
1034 char *p = acpi_os_name;
1035 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1036
1037 if (!str || !*str)
1038 return 0;
1039
1040 for (; count-- && str && *str; str++) {
1041 if (isalnum(*str) || *str == ' ' || *str == ':')
1042 *p++ = *str;
1043 else if (*str == '\'' || *str == '"')
1044 continue;
1045 else
1046 break;
1047 }
1048 *p = 0;
1049
1050 return 1;
1051
1052 }
1053
1054 __setup("acpi_os_name=", acpi_os_name_setup);
1055
1056 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1057 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1058
1059 struct osi_setup_entry {
1060 char string[OSI_STRING_LENGTH_MAX];
1061 bool enable;
1062 };
1063
1064 static struct osi_setup_entry __initdata osi_setup_entries[OSI_STRING_ENTRIES_MAX];
1065
1066 void __init acpi_osi_setup(char *str)
1067 {
1068 struct osi_setup_entry *osi;
1069 bool enable = true;
1070 int i;
1071
1072 if (!acpi_gbl_create_osi_method)
1073 return;
1074
1075 if (str == NULL || *str == '\0') {
1076 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1077 acpi_gbl_create_osi_method = FALSE;
1078 return;
1079 }
1080
1081 if (*str == '!') {
1082 str++;
1083 enable = false;
1084 }
1085
1086 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1087 osi = &osi_setup_entries[i];
1088 if (!strcmp(osi->string, str)) {
1089 osi->enable = enable;
1090 break;
1091 } else if (osi->string[0] == '\0') {
1092 osi->enable = enable;
1093 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1094 break;
1095 }
1096 }
1097 }
1098
1099 static void __init set_osi_linux(unsigned int enable)
1100 {
1101 if (osi_linux.enable != enable)
1102 osi_linux.enable = enable;
1103
1104 if (osi_linux.enable)
1105 acpi_osi_setup("Linux");
1106 else
1107 acpi_osi_setup("!Linux");
1108
1109 return;
1110 }
1111
1112 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1113 {
1114 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1115 osi_linux.dmi = 0;
1116 set_osi_linux(enable);
1117
1118 return;
1119 }
1120
1121 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1122 {
1123 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1124
1125 if (enable == -1)
1126 return;
1127
1128 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1129 set_osi_linux(enable);
1130
1131 return;
1132 }
1133
1134 /*
1135 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1136 *
1137 * empty string disables _OSI
1138 * string starting with '!' disables that string
1139 * otherwise string is added to list, augmenting built-in strings
1140 */
1141 static void __init acpi_osi_setup_late(void)
1142 {
1143 struct osi_setup_entry *osi;
1144 char *str;
1145 int i;
1146 acpi_status status;
1147
1148 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1149 osi = &osi_setup_entries[i];
1150 str = osi->string;
1151
1152 if (*str == '\0')
1153 break;
1154 if (osi->enable) {
1155 status = acpi_install_interface(str);
1156
1157 if (ACPI_SUCCESS(status))
1158 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1159 } else {
1160 status = acpi_remove_interface(str);
1161
1162 if (ACPI_SUCCESS(status))
1163 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1164 }
1165 }
1166 }
1167
1168 static int __init osi_setup(char *str)
1169 {
1170 if (str && !strcmp("Linux", str))
1171 acpi_cmdline_osi_linux(1);
1172 else if (str && !strcmp("!Linux", str))
1173 acpi_cmdline_osi_linux(0);
1174 else
1175 acpi_osi_setup(str);
1176
1177 return 1;
1178 }
1179
1180 __setup("acpi_osi=", osi_setup);
1181
1182 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1183 static int __init acpi_serialize_setup(char *str)
1184 {
1185 printk(KERN_INFO PREFIX "serialize enabled\n");
1186
1187 acpi_gbl_all_methods_serialized = TRUE;
1188
1189 return 1;
1190 }
1191
1192 __setup("acpi_serialize", acpi_serialize_setup);
1193
1194 /* Check of resource interference between native drivers and ACPI
1195 * OperationRegions (SystemIO and System Memory only).
1196 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1197 * in arbitrary AML code and can interfere with legacy drivers.
1198 * acpi_enforce_resources= can be set to:
1199 *
1200 * - strict (default) (2)
1201 * -> further driver trying to access the resources will not load
1202 * - lax (1)
1203 * -> further driver trying to access the resources will load, but you
1204 * get a system message that something might go wrong...
1205 *
1206 * - no (0)
1207 * -> ACPI Operation Region resources will not be registered
1208 *
1209 */
1210 #define ENFORCE_RESOURCES_STRICT 2
1211 #define ENFORCE_RESOURCES_LAX 1
1212 #define ENFORCE_RESOURCES_NO 0
1213
1214 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1215
1216 static int __init acpi_enforce_resources_setup(char *str)
1217 {
1218 if (str == NULL || *str == '\0')
1219 return 0;
1220
1221 if (!strcmp("strict", str))
1222 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1223 else if (!strcmp("lax", str))
1224 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1225 else if (!strcmp("no", str))
1226 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1227
1228 return 1;
1229 }
1230
1231 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1232
1233 /* Check for resource conflicts between ACPI OperationRegions and native
1234 * drivers */
1235 int acpi_check_resource_conflict(const struct resource *res)
1236 {
1237 struct acpi_res_list *res_list_elem;
1238 int ioport = 0, clash = 0;
1239
1240 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1241 return 0;
1242 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1243 return 0;
1244
1245 ioport = res->flags & IORESOURCE_IO;
1246
1247 spin_lock(&acpi_res_lock);
1248 list_for_each_entry(res_list_elem, &resource_list_head,
1249 resource_list) {
1250 if (ioport && (res_list_elem->resource_type
1251 != ACPI_ADR_SPACE_SYSTEM_IO))
1252 continue;
1253 if (!ioport && (res_list_elem->resource_type
1254 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1255 continue;
1256
1257 if (res->end < res_list_elem->start
1258 || res_list_elem->end < res->start)
1259 continue;
1260 clash = 1;
1261 break;
1262 }
1263 spin_unlock(&acpi_res_lock);
1264
1265 if (clash) {
1266 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1267 printk(KERN_WARNING "ACPI: resource %s %pR"
1268 " conflicts with ACPI region %s "
1269 "[%s 0x%zx-0x%zx]\n",
1270 res->name, res, res_list_elem->name,
1271 (res_list_elem->resource_type ==
1272 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1273 (size_t) res_list_elem->start,
1274 (size_t) res_list_elem->end);
1275 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1276 printk(KERN_NOTICE "ACPI: This conflict may"
1277 " cause random problems and system"
1278 " instability\n");
1279 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1280 " for this device, you should use it instead of"
1281 " the native driver\n");
1282 }
1283 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1284 return -EBUSY;
1285 }
1286 return 0;
1287 }
1288 EXPORT_SYMBOL(acpi_check_resource_conflict);
1289
1290 int acpi_check_region(resource_size_t start, resource_size_t n,
1291 const char *name)
1292 {
1293 struct resource res = {
1294 .start = start,
1295 .end = start + n - 1,
1296 .name = name,
1297 .flags = IORESOURCE_IO,
1298 };
1299
1300 return acpi_check_resource_conflict(&res);
1301 }
1302 EXPORT_SYMBOL(acpi_check_region);
1303
1304 /*
1305 * Let drivers know whether the resource checks are effective
1306 */
1307 int acpi_resources_are_enforced(void)
1308 {
1309 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1310 }
1311 EXPORT_SYMBOL(acpi_resources_are_enforced);
1312
1313 /*
1314 * Acquire a spinlock.
1315 *
1316 * handle is a pointer to the spinlock_t.
1317 */
1318
1319 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1320 {
1321 acpi_cpu_flags flags;
1322 spin_lock_irqsave(lockp, flags);
1323 return flags;
1324 }
1325
1326 /*
1327 * Release a spinlock. See above.
1328 */
1329
1330 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1331 {
1332 spin_unlock_irqrestore(lockp, flags);
1333 }
1334
1335 #ifndef ACPI_USE_LOCAL_CACHE
1336
1337 /*******************************************************************************
1338 *
1339 * FUNCTION: acpi_os_create_cache
1340 *
1341 * PARAMETERS: name - Ascii name for the cache
1342 * size - Size of each cached object
1343 * depth - Maximum depth of the cache (in objects) <ignored>
1344 * cache - Where the new cache object is returned
1345 *
1346 * RETURN: status
1347 *
1348 * DESCRIPTION: Create a cache object
1349 *
1350 ******************************************************************************/
1351
1352 acpi_status
1353 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1354 {
1355 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1356 if (*cache == NULL)
1357 return AE_ERROR;
1358 else
1359 return AE_OK;
1360 }
1361
1362 /*******************************************************************************
1363 *
1364 * FUNCTION: acpi_os_purge_cache
1365 *
1366 * PARAMETERS: Cache - Handle to cache object
1367 *
1368 * RETURN: Status
1369 *
1370 * DESCRIPTION: Free all objects within the requested cache.
1371 *
1372 ******************************************************************************/
1373
1374 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1375 {
1376 kmem_cache_shrink(cache);
1377 return (AE_OK);
1378 }
1379
1380 /*******************************************************************************
1381 *
1382 * FUNCTION: acpi_os_delete_cache
1383 *
1384 * PARAMETERS: Cache - Handle to cache object
1385 *
1386 * RETURN: Status
1387 *
1388 * DESCRIPTION: Free all objects within the requested cache and delete the
1389 * cache object.
1390 *
1391 ******************************************************************************/
1392
1393 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1394 {
1395 kmem_cache_destroy(cache);
1396 return (AE_OK);
1397 }
1398
1399 /*******************************************************************************
1400 *
1401 * FUNCTION: acpi_os_release_object
1402 *
1403 * PARAMETERS: Cache - Handle to cache object
1404 * Object - The object to be released
1405 *
1406 * RETURN: None
1407 *
1408 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1409 * the object is deleted.
1410 *
1411 ******************************************************************************/
1412
1413 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1414 {
1415 kmem_cache_free(cache, object);
1416 return (AE_OK);
1417 }
1418
1419 static inline int acpi_res_list_add(struct acpi_res_list *res)
1420 {
1421 struct acpi_res_list *res_list_elem;
1422
1423 list_for_each_entry(res_list_elem, &resource_list_head,
1424 resource_list) {
1425
1426 if (res->resource_type == res_list_elem->resource_type &&
1427 res->start == res_list_elem->start &&
1428 res->end == res_list_elem->end) {
1429
1430 /*
1431 * The Region(addr,len) already exist in the list,
1432 * just increase the count
1433 */
1434
1435 res_list_elem->count++;
1436 return 0;
1437 }
1438 }
1439
1440 res->count = 1;
1441 list_add(&res->resource_list, &resource_list_head);
1442 return 1;
1443 }
1444
1445 static inline void acpi_res_list_del(struct acpi_res_list *res)
1446 {
1447 struct acpi_res_list *res_list_elem;
1448
1449 list_for_each_entry(res_list_elem, &resource_list_head,
1450 resource_list) {
1451
1452 if (res->resource_type == res_list_elem->resource_type &&
1453 res->start == res_list_elem->start &&
1454 res->end == res_list_elem->end) {
1455
1456 /*
1457 * If the res count is decreased to 0,
1458 * remove and free it
1459 */
1460
1461 if (--res_list_elem->count == 0) {
1462 list_del(&res_list_elem->resource_list);
1463 kfree(res_list_elem);
1464 }
1465 return;
1466 }
1467 }
1468 }
1469
1470 acpi_status
1471 acpi_os_invalidate_address(
1472 u8 space_id,
1473 acpi_physical_address address,
1474 acpi_size length)
1475 {
1476 struct acpi_res_list res;
1477
1478 switch (space_id) {
1479 case ACPI_ADR_SPACE_SYSTEM_IO:
1480 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1481 /* Only interference checks against SystemIO and SystemMemory
1482 are needed */
1483 res.start = address;
1484 res.end = address + length - 1;
1485 res.resource_type = space_id;
1486 spin_lock(&acpi_res_lock);
1487 acpi_res_list_del(&res);
1488 spin_unlock(&acpi_res_lock);
1489 break;
1490 case ACPI_ADR_SPACE_PCI_CONFIG:
1491 case ACPI_ADR_SPACE_EC:
1492 case ACPI_ADR_SPACE_SMBUS:
1493 case ACPI_ADR_SPACE_CMOS:
1494 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1495 case ACPI_ADR_SPACE_DATA_TABLE:
1496 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1497 break;
1498 }
1499 return AE_OK;
1500 }
1501
1502 /******************************************************************************
1503 *
1504 * FUNCTION: acpi_os_validate_address
1505 *
1506 * PARAMETERS: space_id - ACPI space ID
1507 * address - Physical address
1508 * length - Address length
1509 *
1510 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1511 * should return AE_AML_ILLEGAL_ADDRESS.
1512 *
1513 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1514 * the addresses accessed by AML operation regions.
1515 *
1516 *****************************************************************************/
1517
1518 acpi_status
1519 acpi_os_validate_address (
1520 u8 space_id,
1521 acpi_physical_address address,
1522 acpi_size length,
1523 char *name)
1524 {
1525 struct acpi_res_list *res;
1526 int added;
1527 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1528 return AE_OK;
1529
1530 switch (space_id) {
1531 case ACPI_ADR_SPACE_SYSTEM_IO:
1532 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1533 /* Only interference checks against SystemIO and SystemMemory
1534 are needed */
1535 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1536 if (!res)
1537 return AE_OK;
1538 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1539 strlcpy(res->name, name, 5);
1540 res->start = address;
1541 res->end = address + length - 1;
1542 res->resource_type = space_id;
1543 spin_lock(&acpi_res_lock);
1544 added = acpi_res_list_add(res);
1545 spin_unlock(&acpi_res_lock);
1546 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1547 "name: %s\n", added ? "Added" : "Already exist",
1548 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1549 ? "SystemIO" : "System Memory",
1550 (unsigned long long)res->start,
1551 (unsigned long long)res->end,
1552 res->name);
1553 if (!added)
1554 kfree(res);
1555 break;
1556 case ACPI_ADR_SPACE_PCI_CONFIG:
1557 case ACPI_ADR_SPACE_EC:
1558 case ACPI_ADR_SPACE_SMBUS:
1559 case ACPI_ADR_SPACE_CMOS:
1560 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1561 case ACPI_ADR_SPACE_DATA_TABLE:
1562 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1563 break;
1564 }
1565 return AE_OK;
1566 }
1567 #endif
1568
1569 acpi_status __init acpi_os_initialize(void)
1570 {
1571 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1572 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1573 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1574 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1575
1576 return AE_OK;
1577 }
1578
1579 acpi_status __init acpi_os_initialize1(void)
1580 {
1581 kacpid_wq = create_workqueue("kacpid");
1582 kacpi_notify_wq = create_workqueue("kacpi_notify");
1583 kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
1584 BUG_ON(!kacpid_wq);
1585 BUG_ON(!kacpi_notify_wq);
1586 BUG_ON(!kacpi_hotplug_wq);
1587 acpi_install_interface_handler(acpi_osi_handler);
1588 acpi_osi_setup_late();
1589 return AE_OK;
1590 }
1591
1592 acpi_status acpi_os_terminate(void)
1593 {
1594 if (acpi_irq_handler) {
1595 acpi_os_remove_interrupt_handler(acpi_irq_irq,
1596 acpi_irq_handler);
1597 }
1598
1599 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1600 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1601 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1602 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1603
1604 destroy_workqueue(kacpid_wq);
1605 destroy_workqueue(kacpi_notify_wq);
1606 destroy_workqueue(kacpi_hotplug_wq);
1607
1608 return AE_OK;
1609 }
Linux kernel - Deliverables
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