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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
56ACPI_MODULE_NAME("osl");
57#define PREFIX "ACPI: "
58struct 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 */
73int acpi_in_debugger;
74EXPORT_SYMBOL(acpi_in_debugger);
75
76extern char line_buf[80];
77#endif /*ENABLE_DEBUGGER */
78
79static acpi_osd_handler acpi_irq_handler;
80static void *acpi_irq_context;
81static struct workqueue_struct *kacpid_wq;
82static struct workqueue_struct *kacpi_notify_wq;
83static struct workqueue_struct *kacpi_hotplug_wq;
84
85struct acpi_res_list {
86 resource_size_t start;
87 resource_size_t end;
88 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
89 char name[5]; /* only can have a length of 4 chars, make use of this
90 one instead of res->name, no need to kalloc then */
91 struct list_head resource_list;
92 int count;
93};
94
95static LIST_HEAD(resource_list_head);
96static DEFINE_SPINLOCK(acpi_res_lock);
97
98/*
99 * This list of permanent mappings is for memory that may be accessed from
100 * interrupt context, where we can't do the ioremap().
101 */
102struct acpi_ioremap {
103 struct list_head list;
104 void __iomem *virt;
105 acpi_physical_address phys;
106 acpi_size size;
107 unsigned long refcount;
108};
109
110static LIST_HEAD(acpi_ioremaps);
111static DEFINE_MUTEX(acpi_ioremap_lock);
112
113static void __init acpi_osi_setup_late(void);
114
115/*
116 * The story of _OSI(Linux)
117 *
118 * From pre-history through Linux-2.6.22,
119 * Linux responded TRUE upon a BIOS OSI(Linux) query.
120 *
121 * Unfortunately, reference BIOS writers got wind of this
122 * and put OSI(Linux) in their example code, quickly exposing
123 * this string as ill-conceived and opening the door to
124 * an un-bounded number of BIOS incompatibilities.
125 *
126 * For example, OSI(Linux) was used on resume to re-POST a
127 * video card on one system, because Linux at that time
128 * could not do a speedy restore in its native driver.
129 * But then upon gaining quick native restore capability,
130 * Linux has no way to tell the BIOS to skip the time-consuming
131 * POST -- putting Linux at a permanent performance disadvantage.
132 * On another system, the BIOS writer used OSI(Linux)
133 * to infer native OS support for IPMI! On other systems,
134 * OSI(Linux) simply got in the way of Linux claiming to
135 * be compatible with other operating systems, exposing
136 * BIOS issues such as skipped device initialization.
137 *
138 * So "Linux" turned out to be a really poor chose of
139 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
140 *
141 * BIOS writers should NOT query _OSI(Linux) on future systems.
142 * Linux will complain on the console when it sees it, and return FALSE.
143 * To get Linux to return TRUE for your system will require
144 * a kernel source update to add a DMI entry,
145 * or boot with "acpi_osi=Linux"
146 */
147
148static struct osi_linux {
149 unsigned int enable:1;
150 unsigned int dmi:1;
151 unsigned int cmdline:1;
152} osi_linux = {0, 0, 0};
153
154static u32 acpi_osi_handler(acpi_string interface, u32 supported)
155{
156 if (!strcmp("Linux", interface)) {
157
158 printk_once(KERN_NOTICE FW_BUG PREFIX
159 "BIOS _OSI(Linux) query %s%s\n",
160 osi_linux.enable ? "honored" : "ignored",
161 osi_linux.cmdline ? " via cmdline" :
162 osi_linux.dmi ? " via DMI" : "");
163 }
164
165 return supported;
166}
167
168static void __init acpi_request_region (struct acpi_generic_address *addr,
169 unsigned int length, char *desc)
170{
171 if (!addr->address || !length)
172 return;
173
174 /* Resources are never freed */
175 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
176 request_region(addr->address, length, desc);
177 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
178 request_mem_region(addr->address, length, desc);
179}
180
181static int __init acpi_reserve_resources(void)
182{
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
184 "ACPI PM1a_EVT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
187 "ACPI PM1b_EVT_BLK");
188
189 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
190 "ACPI PM1a_CNT_BLK");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
193 "ACPI PM1b_CNT_BLK");
194
195 if (acpi_gbl_FADT.pm_timer_length == 4)
196 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
197
198 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
199 "ACPI PM2_CNT_BLK");
200
201 /* Length of GPE blocks must be a non-negative multiple of 2 */
202
203 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
204 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
205 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
206
207 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
208 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
209 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
210
211 return 0;
212}
213device_initcall(acpi_reserve_resources);
214
215void acpi_os_printf(const char *fmt, ...)
216{
217 va_list args;
218 va_start(args, fmt);
219 acpi_os_vprintf(fmt, args);
220 va_end(args);
221}
222
223void acpi_os_vprintf(const char *fmt, va_list args)
224{
225 static char buffer[512];
226
227 vsprintf(buffer, fmt, args);
228
229#ifdef ENABLE_DEBUGGER
230 if (acpi_in_debugger) {
231 kdb_printf("%s", buffer);
232 } else {
233 printk(KERN_CONT "%s", buffer);
234 }
235#else
236 printk(KERN_CONT "%s", buffer);
237#endif
238}
239
240#ifdef CONFIG_KEXEC
241static unsigned long acpi_rsdp;
242static int __init setup_acpi_rsdp(char *arg)
243{
244 acpi_rsdp = simple_strtoul(arg, NULL, 16);
245 return 0;
246}
247early_param("acpi_rsdp", setup_acpi_rsdp);
248#endif
249
250acpi_physical_address __init acpi_os_get_root_pointer(void)
251{
252#ifdef CONFIG_KEXEC
253 if (acpi_rsdp)
254 return acpi_rsdp;
255#endif
256
257 if (efi_enabled) {
258 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
259 return efi.acpi20;
260 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
261 return efi.acpi;
262 else {
263 printk(KERN_ERR PREFIX
264 "System description tables not found\n");
265 return 0;
266 }
267 } else {
268 acpi_physical_address pa = 0;
269
270 acpi_find_root_pointer(&pa);
271 return pa;
272 }
273}
274
275/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
276static struct acpi_ioremap *
277acpi_map_lookup(acpi_physical_address phys, acpi_size size)
278{
279 struct acpi_ioremap *map;
280
281 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
282 if (map->phys <= phys &&
283 phys + size <= map->phys + map->size)
284 return map;
285
286 return NULL;
287}
288
289/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
290static void __iomem *
291acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
292{
293 struct acpi_ioremap *map;
294
295 map = acpi_map_lookup(phys, size);
296 if (map)
297 return map->virt + (phys - map->phys);
298
299 return NULL;
300}
301
302void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
303{
304 struct acpi_ioremap *map;
305 void __iomem *virt = NULL;
306
307 mutex_lock(&acpi_ioremap_lock);
308 map = acpi_map_lookup(phys, size);
309 if (map) {
310 virt = map->virt + (phys - map->phys);
311 map->refcount++;
312 }
313 mutex_unlock(&acpi_ioremap_lock);
314 return virt;
315}
316EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
317
318/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
319static struct acpi_ioremap *
320acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
321{
322 struct acpi_ioremap *map;
323
324 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
325 if (map->virt <= virt &&
326 virt + size <= map->virt + map->size)
327 return map;
328
329 return NULL;
330}
331
332void __iomem *__init_refok
333acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
334{
335 struct acpi_ioremap *map;
336 void __iomem *virt;
337 acpi_physical_address pg_off;
338 acpi_size pg_sz;
339
340 if (phys > ULONG_MAX) {
341 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
342 return NULL;
343 }
344
345 if (!acpi_gbl_permanent_mmap)
346 return __acpi_map_table((unsigned long)phys, size);
347
348 mutex_lock(&acpi_ioremap_lock);
349 /* Check if there's a suitable mapping already. */
350 map = acpi_map_lookup(phys, size);
351 if (map) {
352 map->refcount++;
353 goto out;
354 }
355
356 map = kzalloc(sizeof(*map), GFP_KERNEL);
357 if (!map) {
358 mutex_unlock(&acpi_ioremap_lock);
359 return NULL;
360 }
361
362 pg_off = round_down(phys, PAGE_SIZE);
363 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
364 virt = acpi_os_ioremap(pg_off, pg_sz);
365 if (!virt) {
366 mutex_unlock(&acpi_ioremap_lock);
367 kfree(map);
368 return NULL;
369 }
370
371 INIT_LIST_HEAD(&map->list);
372 map->virt = virt;
373 map->phys = pg_off;
374 map->size = pg_sz;
375 map->refcount = 1;
376
377 list_add_tail_rcu(&map->list, &acpi_ioremaps);
378
379 out:
380 mutex_unlock(&acpi_ioremap_lock);
381 return map->virt + (phys - map->phys);
382}
383EXPORT_SYMBOL_GPL(acpi_os_map_memory);
384
385static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
386{
387 if (!--map->refcount)
388 list_del_rcu(&map->list);
389}
390
391static void acpi_os_map_cleanup(struct acpi_ioremap *map)
392{
393 if (!map->refcount) {
394 synchronize_rcu();
395 iounmap(map->virt);
396 kfree(map);
397 }
398}
399
400void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
401{
402 struct acpi_ioremap *map;
403
404 if (!acpi_gbl_permanent_mmap) {
405 __acpi_unmap_table(virt, size);
406 return;
407 }
408
409 mutex_lock(&acpi_ioremap_lock);
410 map = acpi_map_lookup_virt(virt, size);
411 if (!map) {
412 mutex_unlock(&acpi_ioremap_lock);
413 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
414 return;
415 }
416 acpi_os_drop_map_ref(map);
417 mutex_unlock(&acpi_ioremap_lock);
418
419 acpi_os_map_cleanup(map);
420}
421EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
422
423void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
424{
425 if (!acpi_gbl_permanent_mmap)
426 __acpi_unmap_table(virt, size);
427}
428
429static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
430{
431 void __iomem *virt;
432
433 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
434 return 0;
435
436 if (!addr->address || !addr->bit_width)
437 return -EINVAL;
438
439 virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
440 if (!virt)
441 return -EIO;
442
443 return 0;
444}
445
446static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
447{
448 struct acpi_ioremap *map;
449
450 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
451 return;
452
453 if (!addr->address || !addr->bit_width)
454 return;
455
456 mutex_lock(&acpi_ioremap_lock);
457 map = acpi_map_lookup(addr->address, addr->bit_width / 8);
458 if (!map) {
459 mutex_unlock(&acpi_ioremap_lock);
460 return;
461 }
462 acpi_os_drop_map_ref(map);
463 mutex_unlock(&acpi_ioremap_lock);
464
465 acpi_os_map_cleanup(map);
466}
467
468#ifdef ACPI_FUTURE_USAGE
469acpi_status
470acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
471{
472 if (!phys || !virt)
473 return AE_BAD_PARAMETER;
474
475 *phys = virt_to_phys(virt);
476
477 return AE_OK;
478}
479#endif
480
481#define ACPI_MAX_OVERRIDE_LEN 100
482
483static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
484
485acpi_status
486acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
487 acpi_string * new_val)
488{
489 if (!init_val || !new_val)
490 return AE_BAD_PARAMETER;
491
492 *new_val = NULL;
493 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
494 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
495 acpi_os_name);
496 *new_val = acpi_os_name;
497 }
498
499 return AE_OK;
500}
501
502acpi_status
503acpi_os_table_override(struct acpi_table_header * existing_table,
504 struct acpi_table_header ** new_table)
505{
506 if (!existing_table || !new_table)
507 return AE_BAD_PARAMETER;
508
509 *new_table = NULL;
510
511#ifdef CONFIG_ACPI_CUSTOM_DSDT
512 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
513 *new_table = (struct acpi_table_header *)AmlCode;
514#endif
515 if (*new_table != NULL) {
516 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
517 "this is unsafe: tainting kernel\n",
518 existing_table->signature,
519 existing_table->oem_table_id);
520 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
521 }
522 return AE_OK;
523}
524
525static irqreturn_t acpi_irq(int irq, void *dev_id)
526{
527 u32 handled;
528
529 handled = (*acpi_irq_handler) (acpi_irq_context);
530
531 if (handled) {
532 acpi_irq_handled++;
533 return IRQ_HANDLED;
534 } else {
535 acpi_irq_not_handled++;
536 return IRQ_NONE;
537 }
538}
539
540acpi_status
541acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
542 void *context)
543{
544 unsigned int irq;
545
546 acpi_irq_stats_init();
547
548 /*
549 * ACPI interrupts different from the SCI in our copy of the FADT are
550 * not supported.
551 */
552 if (gsi != acpi_gbl_FADT.sci_interrupt)
553 return AE_BAD_PARAMETER;
554
555 if (acpi_irq_handler)
556 return AE_ALREADY_ACQUIRED;
557
558 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
559 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
560 gsi);
561 return AE_OK;
562 }
563
564 acpi_irq_handler = handler;
565 acpi_irq_context = context;
566 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
567 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
568 acpi_irq_handler = NULL;
569 return AE_NOT_ACQUIRED;
570 }
571
572 return AE_OK;
573}
574
575acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
576{
577 if (irq != acpi_gbl_FADT.sci_interrupt)
578 return AE_BAD_PARAMETER;
579
580 free_irq(irq, acpi_irq);
581 acpi_irq_handler = NULL;
582
583 return AE_OK;
584}
585
586/*
587 * Running in interpreter thread context, safe to sleep
588 */
589
590void acpi_os_sleep(u64 ms)
591{
592 schedule_timeout_interruptible(msecs_to_jiffies(ms));
593}
594
595void acpi_os_stall(u32 us)
596{
597 while (us) {
598 u32 delay = 1000;
599
600 if (delay > us)
601 delay = us;
602 udelay(delay);
603 touch_nmi_watchdog();
604 us -= delay;
605 }
606}
607
608/*
609 * Support ACPI 3.0 AML Timer operand
610 * Returns 64-bit free-running, monotonically increasing timer
611 * with 100ns granularity
612 */
613u64 acpi_os_get_timer(void)
614{
615 static u64 t;
616
617#ifdef CONFIG_HPET
618 /* TBD: use HPET if available */
619#endif
620
621#ifdef CONFIG_X86_PM_TIMER
622 /* TBD: default to PM timer if HPET was not available */
623#endif
624 if (!t)
625 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
626
627 return ++t;
628}
629
630acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
631{
632 u32 dummy;
633
634 if (!value)
635 value = &dummy;
636
637 *value = 0;
638 if (width <= 8) {
639 *(u8 *) value = inb(port);
640 } else if (width <= 16) {
641 *(u16 *) value = inw(port);
642 } else if (width <= 32) {
643 *(u32 *) value = inl(port);
644 } else {
645 BUG();
646 }
647
648 return AE_OK;
649}
650
651EXPORT_SYMBOL(acpi_os_read_port);
652
653acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
654{
655 if (width <= 8) {
656 outb(value, port);
657 } else if (width <= 16) {
658 outw(value, port);
659 } else if (width <= 32) {
660 outl(value, port);
661 } else {
662 BUG();
663 }
664
665 return AE_OK;
666}
667
668EXPORT_SYMBOL(acpi_os_write_port);
669
670acpi_status
671acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
672{
673 void __iomem *virt_addr;
674 unsigned int size = width / 8;
675 bool unmap = false;
676 u32 dummy;
677
678 rcu_read_lock();
679 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
680 if (!virt_addr) {
681 rcu_read_unlock();
682 virt_addr = acpi_os_ioremap(phys_addr, size);
683 if (!virt_addr)
684 return AE_BAD_ADDRESS;
685 unmap = true;
686 }
687
688 if (!value)
689 value = &dummy;
690
691 switch (width) {
692 case 8:
693 *(u8 *) value = readb(virt_addr);
694 break;
695 case 16:
696 *(u16 *) value = readw(virt_addr);
697 break;
698 case 32:
699 *(u32 *) value = readl(virt_addr);
700 break;
701 default:
702 BUG();
703 }
704
705 if (unmap)
706 iounmap(virt_addr);
707 else
708 rcu_read_unlock();
709
710 return AE_OK;
711}
712
713acpi_status
714acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
715{
716 void __iomem *virt_addr;
717 unsigned int size = width / 8;
718 bool unmap = false;
719
720 rcu_read_lock();
721 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
722 if (!virt_addr) {
723 rcu_read_unlock();
724 virt_addr = acpi_os_ioremap(phys_addr, size);
725 if (!virt_addr)
726 return AE_BAD_ADDRESS;
727 unmap = true;
728 }
729
730 switch (width) {
731 case 8:
732 writeb(value, virt_addr);
733 break;
734 case 16:
735 writew(value, virt_addr);
736 break;
737 case 32:
738 writel(value, virt_addr);
739 break;
740 default:
741 BUG();
742 }
743
744 if (unmap)
745 iounmap(virt_addr);
746 else
747 rcu_read_unlock();
748
749 return AE_OK;
750}
751
752acpi_status
753acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
754 u64 *value, u32 width)
755{
756 int result, size;
757 u32 value32;
758
759 if (!value)
760 return AE_BAD_PARAMETER;
761
762 switch (width) {
763 case 8:
764 size = 1;
765 break;
766 case 16:
767 size = 2;
768 break;
769 case 32:
770 size = 4;
771 break;
772 default:
773 return AE_ERROR;
774 }
775
776 result = raw_pci_read(pci_id->segment, pci_id->bus,
777 PCI_DEVFN(pci_id->device, pci_id->function),
778 reg, size, &value32);
779 *value = value32;
780
781 return (result ? AE_ERROR : AE_OK);
782}
783
784acpi_status
785acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
786 u64 value, u32 width)
787{
788 int result, size;
789
790 switch (width) {
791 case 8:
792 size = 1;
793 break;
794 case 16:
795 size = 2;
796 break;
797 case 32:
798 size = 4;
799 break;
800 default:
801 return AE_ERROR;
802 }
803
804 result = raw_pci_write(pci_id->segment, pci_id->bus,
805 PCI_DEVFN(pci_id->device, pci_id->function),
806 reg, size, value);
807
808 return (result ? AE_ERROR : AE_OK);
809}
810
811static void acpi_os_execute_deferred(struct work_struct *work)
812{
813 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
814
815 if (dpc->wait)
816 acpi_os_wait_events_complete(NULL);
817
818 dpc->function(dpc->context);
819 kfree(dpc);
820}
821
822/*******************************************************************************
823 *
824 * FUNCTION: acpi_os_execute
825 *
826 * PARAMETERS: Type - Type of the callback
827 * Function - Function to be executed
828 * Context - Function parameters
829 *
830 * RETURN: Status
831 *
832 * DESCRIPTION: Depending on type, either queues function for deferred execution or
833 * immediately executes function on a separate thread.
834 *
835 ******************************************************************************/
836
837static acpi_status __acpi_os_execute(acpi_execute_type type,
838 acpi_osd_exec_callback function, void *context, int hp)
839{
840 acpi_status status = AE_OK;
841 struct acpi_os_dpc *dpc;
842 struct workqueue_struct *queue;
843 int ret;
844 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
845 "Scheduling function [%p(%p)] for deferred execution.\n",
846 function, context));
847
848 /*
849 * Allocate/initialize DPC structure. Note that this memory will be
850 * freed by the callee. The kernel handles the work_struct list in a
851 * way that allows us to also free its memory inside the callee.
852 * Because we may want to schedule several tasks with different
853 * parameters we can't use the approach some kernel code uses of
854 * having a static work_struct.
855 */
856
857 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
858 if (!dpc)
859 return AE_NO_MEMORY;
860
861 dpc->function = function;
862 dpc->context = context;
863
864 /*
865 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
866 * because the hotplug code may call driver .remove() functions,
867 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
868 * to flush these workqueues.
869 */
870 queue = hp ? kacpi_hotplug_wq :
871 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
872 dpc->wait = hp ? 1 : 0;
873
874 if (queue == kacpi_hotplug_wq)
875 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
876 else if (queue == kacpi_notify_wq)
877 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
878 else
879 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
880
881 /*
882 * On some machines, a software-initiated SMI causes corruption unless
883 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
884 * typically it's done in GPE-related methods that are run via
885 * workqueues, so we can avoid the known corruption cases by always
886 * queueing on CPU 0.
887 */
888 ret = queue_work_on(0, queue, &dpc->work);
889
890 if (!ret) {
891 printk(KERN_ERR PREFIX
892 "Call to queue_work() failed.\n");
893 status = AE_ERROR;
894 kfree(dpc);
895 }
896 return status;
897}
898
899acpi_status acpi_os_execute(acpi_execute_type type,
900 acpi_osd_exec_callback function, void *context)
901{
902 return __acpi_os_execute(type, function, context, 0);
903}
904EXPORT_SYMBOL(acpi_os_execute);
905
906acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
907 void *context)
908{
909 return __acpi_os_execute(0, function, context, 1);
910}
911
912void acpi_os_wait_events_complete(void *context)
913{
914 flush_workqueue(kacpid_wq);
915 flush_workqueue(kacpi_notify_wq);
916}
917
918EXPORT_SYMBOL(acpi_os_wait_events_complete);
919
920acpi_status
921acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
922{
923 struct semaphore *sem = NULL;
924
925 sem = acpi_os_allocate(sizeof(struct semaphore));
926 if (!sem)
927 return AE_NO_MEMORY;
928 memset(sem, 0, sizeof(struct semaphore));
929
930 sema_init(sem, initial_units);
931
932 *handle = (acpi_handle *) sem;
933
934 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
935 *handle, initial_units));
936
937 return AE_OK;
938}
939
940/*
941 * TODO: A better way to delete semaphores? Linux doesn't have a
942 * 'delete_semaphore()' function -- may result in an invalid
943 * pointer dereference for non-synchronized consumers. Should
944 * we at least check for blocked threads and signal/cancel them?
945 */
946
947acpi_status acpi_os_delete_semaphore(acpi_handle handle)
948{
949 struct semaphore *sem = (struct semaphore *)handle;
950
951 if (!sem)
952 return AE_BAD_PARAMETER;
953
954 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
955
956 BUG_ON(!list_empty(&sem->wait_list));
957 kfree(sem);
958 sem = NULL;
959
960 return AE_OK;
961}
962
963/*
964 * TODO: Support for units > 1?
965 */
966acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
967{
968 acpi_status status = AE_OK;
969 struct semaphore *sem = (struct semaphore *)handle;
970 long jiffies;
971 int ret = 0;
972
973 if (!sem || (units < 1))
974 return AE_BAD_PARAMETER;
975
976 if (units > 1)
977 return AE_SUPPORT;
978
979 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
980 handle, units, timeout));
981
982 if (timeout == ACPI_WAIT_FOREVER)
983 jiffies = MAX_SCHEDULE_TIMEOUT;
984 else
985 jiffies = msecs_to_jiffies(timeout);
986
987 ret = down_timeout(sem, jiffies);
988 if (ret)
989 status = AE_TIME;
990
991 if (ACPI_FAILURE(status)) {
992 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
993 "Failed to acquire semaphore[%p|%d|%d], %s",
994 handle, units, timeout,
995 acpi_format_exception(status)));
996 } else {
997 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
998 "Acquired semaphore[%p|%d|%d]", handle,
999 units, timeout));
1000 }
1001
1002 return status;
1003}
1004
1005/*
1006 * TODO: Support for units > 1?
1007 */
1008acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1009{
1010 struct semaphore *sem = (struct semaphore *)handle;
1011
1012 if (!sem || (units < 1))
1013 return AE_BAD_PARAMETER;
1014
1015 if (units > 1)
1016 return AE_SUPPORT;
1017
1018 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1019 units));
1020
1021 up(sem);
1022
1023 return AE_OK;
1024}
1025
1026#ifdef ACPI_FUTURE_USAGE
1027u32 acpi_os_get_line(char *buffer)
1028{
1029
1030#ifdef ENABLE_DEBUGGER
1031 if (acpi_in_debugger) {
1032 u32 chars;
1033
1034 kdb_read(buffer, sizeof(line_buf));
1035
1036 /* remove the CR kdb includes */
1037 chars = strlen(buffer) - 1;
1038 buffer[chars] = '\0';
1039 }
1040#endif
1041
1042 return 0;
1043}
1044#endif /* ACPI_FUTURE_USAGE */
1045
1046acpi_status acpi_os_signal(u32 function, void *info)
1047{
1048 switch (function) {
1049 case ACPI_SIGNAL_FATAL:
1050 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1051 break;
1052 case ACPI_SIGNAL_BREAKPOINT:
1053 /*
1054 * AML Breakpoint
1055 * ACPI spec. says to treat it as a NOP unless
1056 * you are debugging. So if/when we integrate
1057 * AML debugger into the kernel debugger its
1058 * hook will go here. But until then it is
1059 * not useful to print anything on breakpoints.
1060 */
1061 break;
1062 default:
1063 break;
1064 }
1065
1066 return AE_OK;
1067}
1068
1069static int __init acpi_os_name_setup(char *str)
1070{
1071 char *p = acpi_os_name;
1072 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1073
1074 if (!str || !*str)
1075 return 0;
1076
1077 for (; count-- && str && *str; str++) {
1078 if (isalnum(*str) || *str == ' ' || *str == ':')
1079 *p++ = *str;
1080 else if (*str == '\'' || *str == '"')
1081 continue;
1082 else
1083 break;
1084 }
1085 *p = 0;
1086
1087 return 1;
1088
1089}
1090
1091__setup("acpi_os_name=", acpi_os_name_setup);
1092
1093#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1094#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1095
1096struct osi_setup_entry {
1097 char string[OSI_STRING_LENGTH_MAX];
1098 bool enable;
1099};
1100
1101static struct osi_setup_entry __initdata
1102 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1103 {"Module Device", true},
1104 {"Processor Device", true},
1105 {"3.0 _SCP Extensions", true},
1106 {"Processor Aggregator Device", true},
1107};
1108
1109void __init acpi_osi_setup(char *str)
1110{
1111 struct osi_setup_entry *osi;
1112 bool enable = true;
1113 int i;
1114
1115 if (!acpi_gbl_create_osi_method)
1116 return;
1117
1118 if (str == NULL || *str == '\0') {
1119 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1120 acpi_gbl_create_osi_method = FALSE;
1121 return;
1122 }
1123
1124 if (*str == '!') {
1125 str++;
1126 enable = false;
1127 }
1128
1129 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1130 osi = &osi_setup_entries[i];
1131 if (!strcmp(osi->string, str)) {
1132 osi->enable = enable;
1133 break;
1134 } else if (osi->string[0] == '\0') {
1135 osi->enable = enable;
1136 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1137 break;
1138 }
1139 }
1140}
1141
1142static void __init set_osi_linux(unsigned int enable)
1143{
1144 if (osi_linux.enable != enable)
1145 osi_linux.enable = enable;
1146
1147 if (osi_linux.enable)
1148 acpi_osi_setup("Linux");
1149 else
1150 acpi_osi_setup("!Linux");
1151
1152 return;
1153}
1154
1155static void __init acpi_cmdline_osi_linux(unsigned int enable)
1156{
1157 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1158 osi_linux.dmi = 0;
1159 set_osi_linux(enable);
1160
1161 return;
1162}
1163
1164void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1165{
1166 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1167
1168 if (enable == -1)
1169 return;
1170
1171 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1172 set_osi_linux(enable);
1173
1174 return;
1175}
1176
1177/*
1178 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1179 *
1180 * empty string disables _OSI
1181 * string starting with '!' disables that string
1182 * otherwise string is added to list, augmenting built-in strings
1183 */
1184static void __init acpi_osi_setup_late(void)
1185{
1186 struct osi_setup_entry *osi;
1187 char *str;
1188 int i;
1189 acpi_status status;
1190
1191 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1192 osi = &osi_setup_entries[i];
1193 str = osi->string;
1194
1195 if (*str == '\0')
1196 break;
1197 if (osi->enable) {
1198 status = acpi_install_interface(str);
1199
1200 if (ACPI_SUCCESS(status))
1201 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1202 } else {
1203 status = acpi_remove_interface(str);
1204
1205 if (ACPI_SUCCESS(status))
1206 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1207 }
1208 }
1209}
1210
1211static int __init osi_setup(char *str)
1212{
1213 if (str && !strcmp("Linux", str))
1214 acpi_cmdline_osi_linux(1);
1215 else if (str && !strcmp("!Linux", str))
1216 acpi_cmdline_osi_linux(0);
1217 else
1218 acpi_osi_setup(str);
1219
1220 return 1;
1221}
1222
1223__setup("acpi_osi=", osi_setup);
1224
1225/* enable serialization to combat AE_ALREADY_EXISTS errors */
1226static int __init acpi_serialize_setup(char *str)
1227{
1228 printk(KERN_INFO PREFIX "serialize enabled\n");
1229
1230 acpi_gbl_all_methods_serialized = TRUE;
1231
1232 return 1;
1233}
1234
1235__setup("acpi_serialize", acpi_serialize_setup);
1236
1237/* Check of resource interference between native drivers and ACPI
1238 * OperationRegions (SystemIO and System Memory only).
1239 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1240 * in arbitrary AML code and can interfere with legacy drivers.
1241 * acpi_enforce_resources= can be set to:
1242 *
1243 * - strict (default) (2)
1244 * -> further driver trying to access the resources will not load
1245 * - lax (1)
1246 * -> further driver trying to access the resources will load, but you
1247 * get a system message that something might go wrong...
1248 *
1249 * - no (0)
1250 * -> ACPI Operation Region resources will not be registered
1251 *
1252 */
1253#define ENFORCE_RESOURCES_STRICT 2
1254#define ENFORCE_RESOURCES_LAX 1
1255#define ENFORCE_RESOURCES_NO 0
1256
1257static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1258
1259static int __init acpi_enforce_resources_setup(char *str)
1260{
1261 if (str == NULL || *str == '\0')
1262 return 0;
1263
1264 if (!strcmp("strict", str))
1265 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1266 else if (!strcmp("lax", str))
1267 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1268 else if (!strcmp("no", str))
1269 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1270
1271 return 1;
1272}
1273
1274__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1275
1276/* Check for resource conflicts between ACPI OperationRegions and native
1277 * drivers */
1278int acpi_check_resource_conflict(const struct resource *res)
1279{
1280 struct acpi_res_list *res_list_elem;
1281 int ioport = 0, clash = 0;
1282
1283 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1284 return 0;
1285 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1286 return 0;
1287
1288 ioport = res->flags & IORESOURCE_IO;
1289
1290 spin_lock(&acpi_res_lock);
1291 list_for_each_entry(res_list_elem, &resource_list_head,
1292 resource_list) {
1293 if (ioport && (res_list_elem->resource_type
1294 != ACPI_ADR_SPACE_SYSTEM_IO))
1295 continue;
1296 if (!ioport && (res_list_elem->resource_type
1297 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1298 continue;
1299
1300 if (res->end < res_list_elem->start
1301 || res_list_elem->end < res->start)
1302 continue;
1303 clash = 1;
1304 break;
1305 }
1306 spin_unlock(&acpi_res_lock);
1307
1308 if (clash) {
1309 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1310 printk(KERN_WARNING "ACPI: resource %s %pR"
1311 " conflicts with ACPI region %s "
1312 "[%s 0x%zx-0x%zx]\n",
1313 res->name, res, res_list_elem->name,
1314 (res_list_elem->resource_type ==
1315 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1316 (size_t) res_list_elem->start,
1317 (size_t) res_list_elem->end);
1318 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1319 printk(KERN_NOTICE "ACPI: This conflict may"
1320 " cause random problems and system"
1321 " instability\n");
1322 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1323 " for this device, you should use it instead of"
1324 " the native driver\n");
1325 }
1326 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1327 return -EBUSY;
1328 }
1329 return 0;
1330}
1331EXPORT_SYMBOL(acpi_check_resource_conflict);
1332
1333int acpi_check_region(resource_size_t start, resource_size_t n,
1334 const char *name)
1335{
1336 struct resource res = {
1337 .start = start,
1338 .end = start + n - 1,
1339 .name = name,
1340 .flags = IORESOURCE_IO,
1341 };
1342
1343 return acpi_check_resource_conflict(&res);
1344}
1345EXPORT_SYMBOL(acpi_check_region);
1346
1347/*
1348 * Let drivers know whether the resource checks are effective
1349 */
1350int acpi_resources_are_enforced(void)
1351{
1352 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1353}
1354EXPORT_SYMBOL(acpi_resources_are_enforced);
1355
1356/*
1357 * Deallocate the memory for a spinlock.
1358 */
1359void acpi_os_delete_lock(acpi_spinlock handle)
1360{
1361 ACPI_FREE(handle);
1362}
1363
1364/*
1365 * Acquire a spinlock.
1366 *
1367 * handle is a pointer to the spinlock_t.
1368 */
1369
1370acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1371{
1372 acpi_cpu_flags flags;
1373 spin_lock_irqsave(lockp, flags);
1374 return flags;
1375}
1376
1377/*
1378 * Release a spinlock. See above.
1379 */
1380
1381void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1382{
1383 spin_unlock_irqrestore(lockp, flags);
1384}
1385
1386#ifndef ACPI_USE_LOCAL_CACHE
1387
1388/*******************************************************************************
1389 *
1390 * FUNCTION: acpi_os_create_cache
1391 *
1392 * PARAMETERS: name - Ascii name for the cache
1393 * size - Size of each cached object
1394 * depth - Maximum depth of the cache (in objects) <ignored>
1395 * cache - Where the new cache object is returned
1396 *
1397 * RETURN: status
1398 *
1399 * DESCRIPTION: Create a cache object
1400 *
1401 ******************************************************************************/
1402
1403acpi_status
1404acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1405{
1406 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1407 if (*cache == NULL)
1408 return AE_ERROR;
1409 else
1410 return AE_OK;
1411}
1412
1413/*******************************************************************************
1414 *
1415 * FUNCTION: acpi_os_purge_cache
1416 *
1417 * PARAMETERS: Cache - Handle to cache object
1418 *
1419 * RETURN: Status
1420 *
1421 * DESCRIPTION: Free all objects within the requested cache.
1422 *
1423 ******************************************************************************/
1424
1425acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1426{
1427 kmem_cache_shrink(cache);
1428 return (AE_OK);
1429}
1430
1431/*******************************************************************************
1432 *
1433 * FUNCTION: acpi_os_delete_cache
1434 *
1435 * PARAMETERS: Cache - Handle to cache object
1436 *
1437 * RETURN: Status
1438 *
1439 * DESCRIPTION: Free all objects within the requested cache and delete the
1440 * cache object.
1441 *
1442 ******************************************************************************/
1443
1444acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1445{
1446 kmem_cache_destroy(cache);
1447 return (AE_OK);
1448}
1449
1450/*******************************************************************************
1451 *
1452 * FUNCTION: acpi_os_release_object
1453 *
1454 * PARAMETERS: Cache - Handle to cache object
1455 * Object - The object to be released
1456 *
1457 * RETURN: None
1458 *
1459 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1460 * the object is deleted.
1461 *
1462 ******************************************************************************/
1463
1464acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1465{
1466 kmem_cache_free(cache, object);
1467 return (AE_OK);
1468}
1469
1470static inline int acpi_res_list_add(struct acpi_res_list *res)
1471{
1472 struct acpi_res_list *res_list_elem;
1473
1474 list_for_each_entry(res_list_elem, &resource_list_head,
1475 resource_list) {
1476
1477 if (res->resource_type == res_list_elem->resource_type &&
1478 res->start == res_list_elem->start &&
1479 res->end == res_list_elem->end) {
1480
1481 /*
1482 * The Region(addr,len) already exist in the list,
1483 * just increase the count
1484 */
1485
1486 res_list_elem->count++;
1487 return 0;
1488 }
1489 }
1490
1491 res->count = 1;
1492 list_add(&res->resource_list, &resource_list_head);
1493 return 1;
1494}
1495
1496static inline void acpi_res_list_del(struct acpi_res_list *res)
1497{
1498 struct acpi_res_list *res_list_elem;
1499
1500 list_for_each_entry(res_list_elem, &resource_list_head,
1501 resource_list) {
1502
1503 if (res->resource_type == res_list_elem->resource_type &&
1504 res->start == res_list_elem->start &&
1505 res->end == res_list_elem->end) {
1506
1507 /*
1508 * If the res count is decreased to 0,
1509 * remove and free it
1510 */
1511
1512 if (--res_list_elem->count == 0) {
1513 list_del(&res_list_elem->resource_list);
1514 kfree(res_list_elem);
1515 }
1516 return;
1517 }
1518 }
1519}
1520
1521acpi_status
1522acpi_os_invalidate_address(
1523 u8 space_id,
1524 acpi_physical_address address,
1525 acpi_size length)
1526{
1527 struct acpi_res_list res;
1528
1529 switch (space_id) {
1530 case ACPI_ADR_SPACE_SYSTEM_IO:
1531 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1532 /* Only interference checks against SystemIO and SystemMemory
1533 are needed */
1534 res.start = address;
1535 res.end = address + length - 1;
1536 res.resource_type = space_id;
1537 spin_lock(&acpi_res_lock);
1538 acpi_res_list_del(&res);
1539 spin_unlock(&acpi_res_lock);
1540 break;
1541 case ACPI_ADR_SPACE_PCI_CONFIG:
1542 case ACPI_ADR_SPACE_EC:
1543 case ACPI_ADR_SPACE_SMBUS:
1544 case ACPI_ADR_SPACE_CMOS:
1545 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1546 case ACPI_ADR_SPACE_DATA_TABLE:
1547 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1548 break;
1549 }
1550 return AE_OK;
1551}
1552
1553/******************************************************************************
1554 *
1555 * FUNCTION: acpi_os_validate_address
1556 *
1557 * PARAMETERS: space_id - ACPI space ID
1558 * address - Physical address
1559 * length - Address length
1560 *
1561 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1562 * should return AE_AML_ILLEGAL_ADDRESS.
1563 *
1564 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1565 * the addresses accessed by AML operation regions.
1566 *
1567 *****************************************************************************/
1568
1569acpi_status
1570acpi_os_validate_address (
1571 u8 space_id,
1572 acpi_physical_address address,
1573 acpi_size length,
1574 char *name)
1575{
1576 struct acpi_res_list *res;
1577 int added;
1578 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1579 return AE_OK;
1580
1581 switch (space_id) {
1582 case ACPI_ADR_SPACE_SYSTEM_IO:
1583 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1584 /* Only interference checks against SystemIO and SystemMemory
1585 are needed */
1586 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1587 if (!res)
1588 return AE_OK;
1589 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1590 strlcpy(res->name, name, 5);
1591 res->start = address;
1592 res->end = address + length - 1;
1593 res->resource_type = space_id;
1594 spin_lock(&acpi_res_lock);
1595 added = acpi_res_list_add(res);
1596 spin_unlock(&acpi_res_lock);
1597 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1598 "name: %s\n", added ? "Added" : "Already exist",
1599 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1600 ? "SystemIO" : "System Memory",
1601 (unsigned long long)res->start,
1602 (unsigned long long)res->end,
1603 res->name);
1604 if (!added)
1605 kfree(res);
1606 break;
1607 case ACPI_ADR_SPACE_PCI_CONFIG:
1608 case ACPI_ADR_SPACE_EC:
1609 case ACPI_ADR_SPACE_SMBUS:
1610 case ACPI_ADR_SPACE_CMOS:
1611 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1612 case ACPI_ADR_SPACE_DATA_TABLE:
1613 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1614 break;
1615 }
1616 return AE_OK;
1617}
1618#endif
1619
1620acpi_status __init acpi_os_initialize(void)
1621{
1622 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1623 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1624 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1625 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1626
1627 return AE_OK;
1628}
1629
1630acpi_status __init acpi_os_initialize1(void)
1631{
1632 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1633 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1634 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1635 BUG_ON(!kacpid_wq);
1636 BUG_ON(!kacpi_notify_wq);
1637 BUG_ON(!kacpi_hotplug_wq);
1638 acpi_install_interface_handler(acpi_osi_handler);
1639 acpi_osi_setup_late();
1640 return AE_OK;
1641}
1642
1643acpi_status acpi_os_terminate(void)
1644{
1645 if (acpi_irq_handler) {
1646 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1647 acpi_irq_handler);
1648 }
1649
1650 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1651 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1652 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1653 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1654
1655 destroy_workqueue(kacpid_wq);
1656 destroy_workqueue(kacpi_notify_wq);
1657 destroy_workqueue(kacpi_hotplug_wq);
1658
1659 return AE_OK;
1660}
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/acpi_io.h>
43#include <linux/efi.h>
44#include <linux/ioport.h>
45#include <linux/list.h>
46#include <linux/jiffies.h>
47#include <linux/semaphore.h>
48
49#include <asm/io.h>
50#include <asm/uaccess.h>
51
52#include <acpi/acpi.h>
53#include <acpi/acpi_bus.h>
54#include <acpi/processor.h>
55
56#define _COMPONENT ACPI_OS_SERVICES
57ACPI_MODULE_NAME("osl");
58#define PREFIX "ACPI: "
59struct acpi_os_dpc {
60 acpi_osd_exec_callback function;
61 void *context;
62 struct work_struct work;
63 int wait;
64};
65
66#ifdef CONFIG_ACPI_CUSTOM_DSDT
67#include CONFIG_ACPI_CUSTOM_DSDT_FILE
68#endif
69
70#ifdef ENABLE_DEBUGGER
71#include <linux/kdb.h>
72
73/* stuff for debugger support */
74int acpi_in_debugger;
75EXPORT_SYMBOL(acpi_in_debugger);
76
77extern char line_buf[80];
78#endif /*ENABLE_DEBUGGER */
79
80static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81 u32 pm1b_ctrl);
82
83static acpi_osd_handler acpi_irq_handler;
84static void *acpi_irq_context;
85static struct workqueue_struct *kacpid_wq;
86static struct workqueue_struct *kacpi_notify_wq;
87struct workqueue_struct *kacpi_hotplug_wq;
88EXPORT_SYMBOL(kacpi_hotplug_wq);
89
90/*
91 * This list of permanent mappings is for memory that may be accessed from
92 * interrupt context, where we can't do the ioremap().
93 */
94struct acpi_ioremap {
95 struct list_head list;
96 void __iomem *virt;
97 acpi_physical_address phys;
98 acpi_size size;
99 unsigned long refcount;
100};
101
102static LIST_HEAD(acpi_ioremaps);
103static DEFINE_MUTEX(acpi_ioremap_lock);
104
105static void __init acpi_osi_setup_late(void);
106
107/*
108 * The story of _OSI(Linux)
109 *
110 * From pre-history through Linux-2.6.22,
111 * Linux responded TRUE upon a BIOS OSI(Linux) query.
112 *
113 * Unfortunately, reference BIOS writers got wind of this
114 * and put OSI(Linux) in their example code, quickly exposing
115 * this string as ill-conceived and opening the door to
116 * an un-bounded number of BIOS incompatibilities.
117 *
118 * For example, OSI(Linux) was used on resume to re-POST a
119 * video card on one system, because Linux at that time
120 * could not do a speedy restore in its native driver.
121 * But then upon gaining quick native restore capability,
122 * Linux has no way to tell the BIOS to skip the time-consuming
123 * POST -- putting Linux at a permanent performance disadvantage.
124 * On another system, the BIOS writer used OSI(Linux)
125 * to infer native OS support for IPMI! On other systems,
126 * OSI(Linux) simply got in the way of Linux claiming to
127 * be compatible with other operating systems, exposing
128 * BIOS issues such as skipped device initialization.
129 *
130 * So "Linux" turned out to be a really poor chose of
131 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132 *
133 * BIOS writers should NOT query _OSI(Linux) on future systems.
134 * Linux will complain on the console when it sees it, and return FALSE.
135 * To get Linux to return TRUE for your system will require
136 * a kernel source update to add a DMI entry,
137 * or boot with "acpi_osi=Linux"
138 */
139
140static struct osi_linux {
141 unsigned int enable:1;
142 unsigned int dmi:1;
143 unsigned int cmdline:1;
144} osi_linux = {0, 0, 0};
145
146static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147{
148 if (!strcmp("Linux", interface)) {
149
150 printk_once(KERN_NOTICE FW_BUG PREFIX
151 "BIOS _OSI(Linux) query %s%s\n",
152 osi_linux.enable ? "honored" : "ignored",
153 osi_linux.cmdline ? " via cmdline" :
154 osi_linux.dmi ? " via DMI" : "");
155 }
156
157 return supported;
158}
159
160static void __init acpi_request_region (struct acpi_generic_address *gas,
161 unsigned int length, char *desc)
162{
163 u64 addr;
164
165 /* Handle possible alignment issues */
166 memcpy(&addr, &gas->address, sizeof(addr));
167 if (!addr || !length)
168 return;
169
170 /* Resources are never freed */
171 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
172 request_region(addr, length, desc);
173 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
174 request_mem_region(addr, length, desc);
175}
176
177static int __init acpi_reserve_resources(void)
178{
179 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
180 "ACPI PM1a_EVT_BLK");
181
182 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
183 "ACPI PM1b_EVT_BLK");
184
185 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
186 "ACPI PM1a_CNT_BLK");
187
188 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
189 "ACPI PM1b_CNT_BLK");
190
191 if (acpi_gbl_FADT.pm_timer_length == 4)
192 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193
194 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
195 "ACPI PM2_CNT_BLK");
196
197 /* Length of GPE blocks must be a non-negative multiple of 2 */
198
199 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
200 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
201 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202
203 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
204 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
205 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206
207 return 0;
208}
209device_initcall(acpi_reserve_resources);
210
211void acpi_os_printf(const char *fmt, ...)
212{
213 va_list args;
214 va_start(args, fmt);
215 acpi_os_vprintf(fmt, args);
216 va_end(args);
217}
218
219void acpi_os_vprintf(const char *fmt, va_list args)
220{
221 static char buffer[512];
222
223 vsprintf(buffer, fmt, args);
224
225#ifdef ENABLE_DEBUGGER
226 if (acpi_in_debugger) {
227 kdb_printf("%s", buffer);
228 } else {
229 printk(KERN_CONT "%s", buffer);
230 }
231#else
232 printk(KERN_CONT "%s", buffer);
233#endif
234}
235
236#ifdef CONFIG_KEXEC
237static unsigned long acpi_rsdp;
238static int __init setup_acpi_rsdp(char *arg)
239{
240 acpi_rsdp = simple_strtoul(arg, NULL, 16);
241 return 0;
242}
243early_param("acpi_rsdp", setup_acpi_rsdp);
244#endif
245
246acpi_physical_address __init acpi_os_get_root_pointer(void)
247{
248#ifdef CONFIG_KEXEC
249 if (acpi_rsdp)
250 return acpi_rsdp;
251#endif
252
253 if (efi_enabled) {
254 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
255 return efi.acpi20;
256 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
257 return efi.acpi;
258 else {
259 printk(KERN_ERR PREFIX
260 "System description tables not found\n");
261 return 0;
262 }
263 } else {
264 acpi_physical_address pa = 0;
265
266 acpi_find_root_pointer(&pa);
267 return pa;
268 }
269}
270
271/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272static struct acpi_ioremap *
273acpi_map_lookup(acpi_physical_address phys, acpi_size size)
274{
275 struct acpi_ioremap *map;
276
277 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
278 if (map->phys <= phys &&
279 phys + size <= map->phys + map->size)
280 return map;
281
282 return NULL;
283}
284
285/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286static void __iomem *
287acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
288{
289 struct acpi_ioremap *map;
290
291 map = acpi_map_lookup(phys, size);
292 if (map)
293 return map->virt + (phys - map->phys);
294
295 return NULL;
296}
297
298void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
299{
300 struct acpi_ioremap *map;
301 void __iomem *virt = NULL;
302
303 mutex_lock(&acpi_ioremap_lock);
304 map = acpi_map_lookup(phys, size);
305 if (map) {
306 virt = map->virt + (phys - map->phys);
307 map->refcount++;
308 }
309 mutex_unlock(&acpi_ioremap_lock);
310 return virt;
311}
312EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
313
314/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315static struct acpi_ioremap *
316acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
317{
318 struct acpi_ioremap *map;
319
320 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
321 if (map->virt <= virt &&
322 virt + size <= map->virt + map->size)
323 return map;
324
325 return NULL;
326}
327
328#ifndef CONFIG_IA64
329#define should_use_kmap(pfn) page_is_ram(pfn)
330#else
331/* ioremap will take care of cache attributes */
332#define should_use_kmap(pfn) 0
333#endif
334
335static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336{
337 unsigned long pfn;
338
339 pfn = pg_off >> PAGE_SHIFT;
340 if (should_use_kmap(pfn)) {
341 if (pg_sz > PAGE_SIZE)
342 return NULL;
343 return (void __iomem __force *)kmap(pfn_to_page(pfn));
344 } else
345 return acpi_os_ioremap(pg_off, pg_sz);
346}
347
348static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349{
350 unsigned long pfn;
351
352 pfn = pg_off >> PAGE_SHIFT;
353 if (should_use_kmap(pfn))
354 kunmap(pfn_to_page(pfn));
355 else
356 iounmap(vaddr);
357}
358
359void __iomem *__init_refok
360acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
361{
362 struct acpi_ioremap *map;
363 void __iomem *virt;
364 acpi_physical_address pg_off;
365 acpi_size pg_sz;
366
367 if (phys > ULONG_MAX) {
368 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369 return NULL;
370 }
371
372 if (!acpi_gbl_permanent_mmap)
373 return __acpi_map_table((unsigned long)phys, size);
374
375 mutex_lock(&acpi_ioremap_lock);
376 /* Check if there's a suitable mapping already. */
377 map = acpi_map_lookup(phys, size);
378 if (map) {
379 map->refcount++;
380 goto out;
381 }
382
383 map = kzalloc(sizeof(*map), GFP_KERNEL);
384 if (!map) {
385 mutex_unlock(&acpi_ioremap_lock);
386 return NULL;
387 }
388
389 pg_off = round_down(phys, PAGE_SIZE);
390 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
391 virt = acpi_map(pg_off, pg_sz);
392 if (!virt) {
393 mutex_unlock(&acpi_ioremap_lock);
394 kfree(map);
395 return NULL;
396 }
397
398 INIT_LIST_HEAD(&map->list);
399 map->virt = virt;
400 map->phys = pg_off;
401 map->size = pg_sz;
402 map->refcount = 1;
403
404 list_add_tail_rcu(&map->list, &acpi_ioremaps);
405
406 out:
407 mutex_unlock(&acpi_ioremap_lock);
408 return map->virt + (phys - map->phys);
409}
410EXPORT_SYMBOL_GPL(acpi_os_map_memory);
411
412static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
413{
414 if (!--map->refcount)
415 list_del_rcu(&map->list);
416}
417
418static void acpi_os_map_cleanup(struct acpi_ioremap *map)
419{
420 if (!map->refcount) {
421 synchronize_rcu();
422 acpi_unmap(map->phys, map->virt);
423 kfree(map);
424 }
425}
426
427void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
428{
429 struct acpi_ioremap *map;
430
431 if (!acpi_gbl_permanent_mmap) {
432 __acpi_unmap_table(virt, size);
433 return;
434 }
435
436 mutex_lock(&acpi_ioremap_lock);
437 map = acpi_map_lookup_virt(virt, size);
438 if (!map) {
439 mutex_unlock(&acpi_ioremap_lock);
440 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
441 return;
442 }
443 acpi_os_drop_map_ref(map);
444 mutex_unlock(&acpi_ioremap_lock);
445
446 acpi_os_map_cleanup(map);
447}
448EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
451{
452 if (!acpi_gbl_permanent_mmap)
453 __acpi_unmap_table(virt, size);
454}
455
456int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457{
458 u64 addr;
459 void __iomem *virt;
460
461 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462 return 0;
463
464 /* Handle possible alignment issues */
465 memcpy(&addr, &gas->address, sizeof(addr));
466 if (!addr || !gas->bit_width)
467 return -EINVAL;
468
469 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
470 if (!virt)
471 return -EIO;
472
473 return 0;
474}
475EXPORT_SYMBOL(acpi_os_map_generic_address);
476
477void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
478{
479 u64 addr;
480 struct acpi_ioremap *map;
481
482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 return;
484
485 /* Handle possible alignment issues */
486 memcpy(&addr, &gas->address, sizeof(addr));
487 if (!addr || !gas->bit_width)
488 return;
489
490 mutex_lock(&acpi_ioremap_lock);
491 map = acpi_map_lookup(addr, gas->bit_width / 8);
492 if (!map) {
493 mutex_unlock(&acpi_ioremap_lock);
494 return;
495 }
496 acpi_os_drop_map_ref(map);
497 mutex_unlock(&acpi_ioremap_lock);
498
499 acpi_os_map_cleanup(map);
500}
501EXPORT_SYMBOL(acpi_os_unmap_generic_address);
502
503#ifdef ACPI_FUTURE_USAGE
504acpi_status
505acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
506{
507 if (!phys || !virt)
508 return AE_BAD_PARAMETER;
509
510 *phys = virt_to_phys(virt);
511
512 return AE_OK;
513}
514#endif
515
516#define ACPI_MAX_OVERRIDE_LEN 100
517
518static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519
520acpi_status
521acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
522 acpi_string * new_val)
523{
524 if (!init_val || !new_val)
525 return AE_BAD_PARAMETER;
526
527 *new_val = NULL;
528 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
529 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
530 acpi_os_name);
531 *new_val = acpi_os_name;
532 }
533
534 return AE_OK;
535}
536
537acpi_status
538acpi_os_table_override(struct acpi_table_header * existing_table,
539 struct acpi_table_header ** new_table)
540{
541 if (!existing_table || !new_table)
542 return AE_BAD_PARAMETER;
543
544 *new_table = NULL;
545
546#ifdef CONFIG_ACPI_CUSTOM_DSDT
547 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
548 *new_table = (struct acpi_table_header *)AmlCode;
549#endif
550 if (*new_table != NULL) {
551 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
552 "this is unsafe: tainting kernel\n",
553 existing_table->signature,
554 existing_table->oem_table_id);
555 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
556 }
557 return AE_OK;
558}
559
560acpi_status
561acpi_os_physical_table_override(struct acpi_table_header *existing_table,
562 acpi_physical_address * new_address,
563 u32 *new_table_length)
564{
565 return AE_SUPPORT;
566}
567
568
569static irqreturn_t acpi_irq(int irq, void *dev_id)
570{
571 u32 handled;
572
573 handled = (*acpi_irq_handler) (acpi_irq_context);
574
575 if (handled) {
576 acpi_irq_handled++;
577 return IRQ_HANDLED;
578 } else {
579 acpi_irq_not_handled++;
580 return IRQ_NONE;
581 }
582}
583
584acpi_status
585acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
586 void *context)
587{
588 unsigned int irq;
589
590 acpi_irq_stats_init();
591
592 /*
593 * ACPI interrupts different from the SCI in our copy of the FADT are
594 * not supported.
595 */
596 if (gsi != acpi_gbl_FADT.sci_interrupt)
597 return AE_BAD_PARAMETER;
598
599 if (acpi_irq_handler)
600 return AE_ALREADY_ACQUIRED;
601
602 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
603 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
604 gsi);
605 return AE_OK;
606 }
607
608 acpi_irq_handler = handler;
609 acpi_irq_context = context;
610 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
611 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
612 acpi_irq_handler = NULL;
613 return AE_NOT_ACQUIRED;
614 }
615
616 return AE_OK;
617}
618
619acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
620{
621 if (irq != acpi_gbl_FADT.sci_interrupt)
622 return AE_BAD_PARAMETER;
623
624 free_irq(irq, acpi_irq);
625 acpi_irq_handler = NULL;
626
627 return AE_OK;
628}
629
630/*
631 * Running in interpreter thread context, safe to sleep
632 */
633
634void acpi_os_sleep(u64 ms)
635{
636 schedule_timeout_interruptible(msecs_to_jiffies(ms));
637}
638
639void acpi_os_stall(u32 us)
640{
641 while (us) {
642 u32 delay = 1000;
643
644 if (delay > us)
645 delay = us;
646 udelay(delay);
647 touch_nmi_watchdog();
648 us -= delay;
649 }
650}
651
652/*
653 * Support ACPI 3.0 AML Timer operand
654 * Returns 64-bit free-running, monotonically increasing timer
655 * with 100ns granularity
656 */
657u64 acpi_os_get_timer(void)
658{
659 static u64 t;
660
661#ifdef CONFIG_HPET
662 /* TBD: use HPET if available */
663#endif
664
665#ifdef CONFIG_X86_PM_TIMER
666 /* TBD: default to PM timer if HPET was not available */
667#endif
668 if (!t)
669 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
670
671 return ++t;
672}
673
674acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
675{
676 u32 dummy;
677
678 if (!value)
679 value = &dummy;
680
681 *value = 0;
682 if (width <= 8) {
683 *(u8 *) value = inb(port);
684 } else if (width <= 16) {
685 *(u16 *) value = inw(port);
686 } else if (width <= 32) {
687 *(u32 *) value = inl(port);
688 } else {
689 BUG();
690 }
691
692 return AE_OK;
693}
694
695EXPORT_SYMBOL(acpi_os_read_port);
696
697acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
698{
699 if (width <= 8) {
700 outb(value, port);
701 } else if (width <= 16) {
702 outw(value, port);
703 } else if (width <= 32) {
704 outl(value, port);
705 } else {
706 BUG();
707 }
708
709 return AE_OK;
710}
711
712EXPORT_SYMBOL(acpi_os_write_port);
713
714#ifdef readq
715static inline u64 read64(const volatile void __iomem *addr)
716{
717 return readq(addr);
718}
719#else
720static inline u64 read64(const volatile void __iomem *addr)
721{
722 u64 l, h;
723 l = readl(addr);
724 h = readl(addr+4);
725 return l | (h << 32);
726}
727#endif
728
729acpi_status
730acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
731{
732 void __iomem *virt_addr;
733 unsigned int size = width / 8;
734 bool unmap = false;
735 u64 dummy;
736
737 rcu_read_lock();
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
739 if (!virt_addr) {
740 rcu_read_unlock();
741 virt_addr = acpi_os_ioremap(phys_addr, size);
742 if (!virt_addr)
743 return AE_BAD_ADDRESS;
744 unmap = true;
745 }
746
747 if (!value)
748 value = &dummy;
749
750 switch (width) {
751 case 8:
752 *(u8 *) value = readb(virt_addr);
753 break;
754 case 16:
755 *(u16 *) value = readw(virt_addr);
756 break;
757 case 32:
758 *(u32 *) value = readl(virt_addr);
759 break;
760 case 64:
761 *(u64 *) value = read64(virt_addr);
762 break;
763 default:
764 BUG();
765 }
766
767 if (unmap)
768 iounmap(virt_addr);
769 else
770 rcu_read_unlock();
771
772 return AE_OK;
773}
774
775#ifdef writeq
776static inline void write64(u64 val, volatile void __iomem *addr)
777{
778 writeq(val, addr);
779}
780#else
781static inline void write64(u64 val, volatile void __iomem *addr)
782{
783 writel(val, addr);
784 writel(val>>32, addr+4);
785}
786#endif
787
788acpi_status
789acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
790{
791 void __iomem *virt_addr;
792 unsigned int size = width / 8;
793 bool unmap = false;
794
795 rcu_read_lock();
796 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
797 if (!virt_addr) {
798 rcu_read_unlock();
799 virt_addr = acpi_os_ioremap(phys_addr, size);
800 if (!virt_addr)
801 return AE_BAD_ADDRESS;
802 unmap = true;
803 }
804
805 switch (width) {
806 case 8:
807 writeb(value, virt_addr);
808 break;
809 case 16:
810 writew(value, virt_addr);
811 break;
812 case 32:
813 writel(value, virt_addr);
814 break;
815 case 64:
816 write64(value, virt_addr);
817 break;
818 default:
819 BUG();
820 }
821
822 if (unmap)
823 iounmap(virt_addr);
824 else
825 rcu_read_unlock();
826
827 return AE_OK;
828}
829
830acpi_status
831acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
832 u64 *value, u32 width)
833{
834 int result, size;
835 u32 value32;
836
837 if (!value)
838 return AE_BAD_PARAMETER;
839
840 switch (width) {
841 case 8:
842 size = 1;
843 break;
844 case 16:
845 size = 2;
846 break;
847 case 32:
848 size = 4;
849 break;
850 default:
851 return AE_ERROR;
852 }
853
854 result = raw_pci_read(pci_id->segment, pci_id->bus,
855 PCI_DEVFN(pci_id->device, pci_id->function),
856 reg, size, &value32);
857 *value = value32;
858
859 return (result ? AE_ERROR : AE_OK);
860}
861
862acpi_status
863acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
864 u64 value, u32 width)
865{
866 int result, size;
867
868 switch (width) {
869 case 8:
870 size = 1;
871 break;
872 case 16:
873 size = 2;
874 break;
875 case 32:
876 size = 4;
877 break;
878 default:
879 return AE_ERROR;
880 }
881
882 result = raw_pci_write(pci_id->segment, pci_id->bus,
883 PCI_DEVFN(pci_id->device, pci_id->function),
884 reg, size, value);
885
886 return (result ? AE_ERROR : AE_OK);
887}
888
889static void acpi_os_execute_deferred(struct work_struct *work)
890{
891 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
892
893 if (dpc->wait)
894 acpi_os_wait_events_complete(NULL);
895
896 dpc->function(dpc->context);
897 kfree(dpc);
898}
899
900/*******************************************************************************
901 *
902 * FUNCTION: acpi_os_execute
903 *
904 * PARAMETERS: Type - Type of the callback
905 * Function - Function to be executed
906 * Context - Function parameters
907 *
908 * RETURN: Status
909 *
910 * DESCRIPTION: Depending on type, either queues function for deferred execution or
911 * immediately executes function on a separate thread.
912 *
913 ******************************************************************************/
914
915static acpi_status __acpi_os_execute(acpi_execute_type type,
916 acpi_osd_exec_callback function, void *context, int hp)
917{
918 acpi_status status = AE_OK;
919 struct acpi_os_dpc *dpc;
920 struct workqueue_struct *queue;
921 int ret;
922 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
923 "Scheduling function [%p(%p)] for deferred execution.\n",
924 function, context));
925
926 /*
927 * Allocate/initialize DPC structure. Note that this memory will be
928 * freed by the callee. The kernel handles the work_struct list in a
929 * way that allows us to also free its memory inside the callee.
930 * Because we may want to schedule several tasks with different
931 * parameters we can't use the approach some kernel code uses of
932 * having a static work_struct.
933 */
934
935 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
936 if (!dpc)
937 return AE_NO_MEMORY;
938
939 dpc->function = function;
940 dpc->context = context;
941
942 /*
943 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
944 * because the hotplug code may call driver .remove() functions,
945 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
946 * to flush these workqueues.
947 */
948 queue = hp ? kacpi_hotplug_wq :
949 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
950 dpc->wait = hp ? 1 : 0;
951
952 if (queue == kacpi_hotplug_wq)
953 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
954 else if (queue == kacpi_notify_wq)
955 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
956 else
957 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
958
959 /*
960 * On some machines, a software-initiated SMI causes corruption unless
961 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
962 * typically it's done in GPE-related methods that are run via
963 * workqueues, so we can avoid the known corruption cases by always
964 * queueing on CPU 0.
965 */
966 ret = queue_work_on(0, queue, &dpc->work);
967
968 if (!ret) {
969 printk(KERN_ERR PREFIX
970 "Call to queue_work() failed.\n");
971 status = AE_ERROR;
972 kfree(dpc);
973 }
974 return status;
975}
976
977acpi_status acpi_os_execute(acpi_execute_type type,
978 acpi_osd_exec_callback function, void *context)
979{
980 return __acpi_os_execute(type, function, context, 0);
981}
982EXPORT_SYMBOL(acpi_os_execute);
983
984acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
985 void *context)
986{
987 return __acpi_os_execute(0, function, context, 1);
988}
989
990void acpi_os_wait_events_complete(void *context)
991{
992 flush_workqueue(kacpid_wq);
993 flush_workqueue(kacpi_notify_wq);
994}
995
996EXPORT_SYMBOL(acpi_os_wait_events_complete);
997
998acpi_status
999acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1000{
1001 struct semaphore *sem = NULL;
1002
1003 sem = acpi_os_allocate(sizeof(struct semaphore));
1004 if (!sem)
1005 return AE_NO_MEMORY;
1006 memset(sem, 0, sizeof(struct semaphore));
1007
1008 sema_init(sem, initial_units);
1009
1010 *handle = (acpi_handle *) sem;
1011
1012 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1013 *handle, initial_units));
1014
1015 return AE_OK;
1016}
1017
1018/*
1019 * TODO: A better way to delete semaphores? Linux doesn't have a
1020 * 'delete_semaphore()' function -- may result in an invalid
1021 * pointer dereference for non-synchronized consumers. Should
1022 * we at least check for blocked threads and signal/cancel them?
1023 */
1024
1025acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1026{
1027 struct semaphore *sem = (struct semaphore *)handle;
1028
1029 if (!sem)
1030 return AE_BAD_PARAMETER;
1031
1032 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1033
1034 BUG_ON(!list_empty(&sem->wait_list));
1035 kfree(sem);
1036 sem = NULL;
1037
1038 return AE_OK;
1039}
1040
1041/*
1042 * TODO: Support for units > 1?
1043 */
1044acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1045{
1046 acpi_status status = AE_OK;
1047 struct semaphore *sem = (struct semaphore *)handle;
1048 long jiffies;
1049 int ret = 0;
1050
1051 if (!sem || (units < 1))
1052 return AE_BAD_PARAMETER;
1053
1054 if (units > 1)
1055 return AE_SUPPORT;
1056
1057 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1058 handle, units, timeout));
1059
1060 if (timeout == ACPI_WAIT_FOREVER)
1061 jiffies = MAX_SCHEDULE_TIMEOUT;
1062 else
1063 jiffies = msecs_to_jiffies(timeout);
1064
1065 ret = down_timeout(sem, jiffies);
1066 if (ret)
1067 status = AE_TIME;
1068
1069 if (ACPI_FAILURE(status)) {
1070 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1071 "Failed to acquire semaphore[%p|%d|%d], %s",
1072 handle, units, timeout,
1073 acpi_format_exception(status)));
1074 } else {
1075 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1076 "Acquired semaphore[%p|%d|%d]", handle,
1077 units, timeout));
1078 }
1079
1080 return status;
1081}
1082
1083/*
1084 * TODO: Support for units > 1?
1085 */
1086acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1087{
1088 struct semaphore *sem = (struct semaphore *)handle;
1089
1090 if (!sem || (units < 1))
1091 return AE_BAD_PARAMETER;
1092
1093 if (units > 1)
1094 return AE_SUPPORT;
1095
1096 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1097 units));
1098
1099 up(sem);
1100
1101 return AE_OK;
1102}
1103
1104#ifdef ACPI_FUTURE_USAGE
1105u32 acpi_os_get_line(char *buffer)
1106{
1107
1108#ifdef ENABLE_DEBUGGER
1109 if (acpi_in_debugger) {
1110 u32 chars;
1111
1112 kdb_read(buffer, sizeof(line_buf));
1113
1114 /* remove the CR kdb includes */
1115 chars = strlen(buffer) - 1;
1116 buffer[chars] = '\0';
1117 }
1118#endif
1119
1120 return 0;
1121}
1122#endif /* ACPI_FUTURE_USAGE */
1123
1124acpi_status acpi_os_signal(u32 function, void *info)
1125{
1126 switch (function) {
1127 case ACPI_SIGNAL_FATAL:
1128 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1129 break;
1130 case ACPI_SIGNAL_BREAKPOINT:
1131 /*
1132 * AML Breakpoint
1133 * ACPI spec. says to treat it as a NOP unless
1134 * you are debugging. So if/when we integrate
1135 * AML debugger into the kernel debugger its
1136 * hook will go here. But until then it is
1137 * not useful to print anything on breakpoints.
1138 */
1139 break;
1140 default:
1141 break;
1142 }
1143
1144 return AE_OK;
1145}
1146
1147static int __init acpi_os_name_setup(char *str)
1148{
1149 char *p = acpi_os_name;
1150 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1151
1152 if (!str || !*str)
1153 return 0;
1154
1155 for (; count-- && str && *str; str++) {
1156 if (isalnum(*str) || *str == ' ' || *str == ':')
1157 *p++ = *str;
1158 else if (*str == '\'' || *str == '"')
1159 continue;
1160 else
1161 break;
1162 }
1163 *p = 0;
1164
1165 return 1;
1166
1167}
1168
1169__setup("acpi_os_name=", acpi_os_name_setup);
1170
1171#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1172#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1173
1174struct osi_setup_entry {
1175 char string[OSI_STRING_LENGTH_MAX];
1176 bool enable;
1177};
1178
1179static struct osi_setup_entry __initdata
1180 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1181 {"Module Device", true},
1182 {"Processor Device", true},
1183 {"3.0 _SCP Extensions", true},
1184 {"Processor Aggregator Device", true},
1185};
1186
1187void __init acpi_osi_setup(char *str)
1188{
1189 struct osi_setup_entry *osi;
1190 bool enable = true;
1191 int i;
1192
1193 if (!acpi_gbl_create_osi_method)
1194 return;
1195
1196 if (str == NULL || *str == '\0') {
1197 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1198 acpi_gbl_create_osi_method = FALSE;
1199 return;
1200 }
1201
1202 if (*str == '!') {
1203 str++;
1204 enable = false;
1205 }
1206
1207 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1208 osi = &osi_setup_entries[i];
1209 if (!strcmp(osi->string, str)) {
1210 osi->enable = enable;
1211 break;
1212 } else if (osi->string[0] == '\0') {
1213 osi->enable = enable;
1214 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1215 break;
1216 }
1217 }
1218}
1219
1220static void __init set_osi_linux(unsigned int enable)
1221{
1222 if (osi_linux.enable != enable)
1223 osi_linux.enable = enable;
1224
1225 if (osi_linux.enable)
1226 acpi_osi_setup("Linux");
1227 else
1228 acpi_osi_setup("!Linux");
1229
1230 return;
1231}
1232
1233static void __init acpi_cmdline_osi_linux(unsigned int enable)
1234{
1235 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1236 osi_linux.dmi = 0;
1237 set_osi_linux(enable);
1238
1239 return;
1240}
1241
1242void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1243{
1244 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1245
1246 if (enable == -1)
1247 return;
1248
1249 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1250 set_osi_linux(enable);
1251
1252 return;
1253}
1254
1255/*
1256 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1257 *
1258 * empty string disables _OSI
1259 * string starting with '!' disables that string
1260 * otherwise string is added to list, augmenting built-in strings
1261 */
1262static void __init acpi_osi_setup_late(void)
1263{
1264 struct osi_setup_entry *osi;
1265 char *str;
1266 int i;
1267 acpi_status status;
1268
1269 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1270 osi = &osi_setup_entries[i];
1271 str = osi->string;
1272
1273 if (*str == '\0')
1274 break;
1275 if (osi->enable) {
1276 status = acpi_install_interface(str);
1277
1278 if (ACPI_SUCCESS(status))
1279 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1280 } else {
1281 status = acpi_remove_interface(str);
1282
1283 if (ACPI_SUCCESS(status))
1284 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1285 }
1286 }
1287}
1288
1289static int __init osi_setup(char *str)
1290{
1291 if (str && !strcmp("Linux", str))
1292 acpi_cmdline_osi_linux(1);
1293 else if (str && !strcmp("!Linux", str))
1294 acpi_cmdline_osi_linux(0);
1295 else
1296 acpi_osi_setup(str);
1297
1298 return 1;
1299}
1300
1301__setup("acpi_osi=", osi_setup);
1302
1303/* enable serialization to combat AE_ALREADY_EXISTS errors */
1304static int __init acpi_serialize_setup(char *str)
1305{
1306 printk(KERN_INFO PREFIX "serialize enabled\n");
1307
1308 acpi_gbl_all_methods_serialized = TRUE;
1309
1310 return 1;
1311}
1312
1313__setup("acpi_serialize", acpi_serialize_setup);
1314
1315/* Check of resource interference between native drivers and ACPI
1316 * OperationRegions (SystemIO and System Memory only).
1317 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1318 * in arbitrary AML code and can interfere with legacy drivers.
1319 * acpi_enforce_resources= can be set to:
1320 *
1321 * - strict (default) (2)
1322 * -> further driver trying to access the resources will not load
1323 * - lax (1)
1324 * -> further driver trying to access the resources will load, but you
1325 * get a system message that something might go wrong...
1326 *
1327 * - no (0)
1328 * -> ACPI Operation Region resources will not be registered
1329 *
1330 */
1331#define ENFORCE_RESOURCES_STRICT 2
1332#define ENFORCE_RESOURCES_LAX 1
1333#define ENFORCE_RESOURCES_NO 0
1334
1335static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1336
1337static int __init acpi_enforce_resources_setup(char *str)
1338{
1339 if (str == NULL || *str == '\0')
1340 return 0;
1341
1342 if (!strcmp("strict", str))
1343 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1344 else if (!strcmp("lax", str))
1345 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1346 else if (!strcmp("no", str))
1347 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1348
1349 return 1;
1350}
1351
1352__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1353
1354/* Check for resource conflicts between ACPI OperationRegions and native
1355 * drivers */
1356int acpi_check_resource_conflict(const struct resource *res)
1357{
1358 acpi_adr_space_type space_id;
1359 acpi_size length;
1360 u8 warn = 0;
1361 int clash = 0;
1362
1363 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1364 return 0;
1365 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1366 return 0;
1367
1368 if (res->flags & IORESOURCE_IO)
1369 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1370 else
1371 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1372
1373 length = res->end - res->start + 1;
1374 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1375 warn = 1;
1376 clash = acpi_check_address_range(space_id, res->start, length, warn);
1377
1378 if (clash) {
1379 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1380 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1381 printk(KERN_NOTICE "ACPI: This conflict may"
1382 " cause random problems and system"
1383 " instability\n");
1384 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1385 " for this device, you should use it instead of"
1386 " the native driver\n");
1387 }
1388 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1389 return -EBUSY;
1390 }
1391 return 0;
1392}
1393EXPORT_SYMBOL(acpi_check_resource_conflict);
1394
1395int acpi_check_region(resource_size_t start, resource_size_t n,
1396 const char *name)
1397{
1398 struct resource res = {
1399 .start = start,
1400 .end = start + n - 1,
1401 .name = name,
1402 .flags = IORESOURCE_IO,
1403 };
1404
1405 return acpi_check_resource_conflict(&res);
1406}
1407EXPORT_SYMBOL(acpi_check_region);
1408
1409/*
1410 * Let drivers know whether the resource checks are effective
1411 */
1412int acpi_resources_are_enforced(void)
1413{
1414 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1415}
1416EXPORT_SYMBOL(acpi_resources_are_enforced);
1417
1418/*
1419 * Deallocate the memory for a spinlock.
1420 */
1421void acpi_os_delete_lock(acpi_spinlock handle)
1422{
1423 ACPI_FREE(handle);
1424}
1425
1426/*
1427 * Acquire a spinlock.
1428 *
1429 * handle is a pointer to the spinlock_t.
1430 */
1431
1432acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1433{
1434 acpi_cpu_flags flags;
1435 spin_lock_irqsave(lockp, flags);
1436 return flags;
1437}
1438
1439/*
1440 * Release a spinlock. See above.
1441 */
1442
1443void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1444{
1445 spin_unlock_irqrestore(lockp, flags);
1446}
1447
1448#ifndef ACPI_USE_LOCAL_CACHE
1449
1450/*******************************************************************************
1451 *
1452 * FUNCTION: acpi_os_create_cache
1453 *
1454 * PARAMETERS: name - Ascii name for the cache
1455 * size - Size of each cached object
1456 * depth - Maximum depth of the cache (in objects) <ignored>
1457 * cache - Where the new cache object is returned
1458 *
1459 * RETURN: status
1460 *
1461 * DESCRIPTION: Create a cache object
1462 *
1463 ******************************************************************************/
1464
1465acpi_status
1466acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1467{
1468 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1469 if (*cache == NULL)
1470 return AE_ERROR;
1471 else
1472 return AE_OK;
1473}
1474
1475/*******************************************************************************
1476 *
1477 * FUNCTION: acpi_os_purge_cache
1478 *
1479 * PARAMETERS: Cache - Handle to cache object
1480 *
1481 * RETURN: Status
1482 *
1483 * DESCRIPTION: Free all objects within the requested cache.
1484 *
1485 ******************************************************************************/
1486
1487acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1488{
1489 kmem_cache_shrink(cache);
1490 return (AE_OK);
1491}
1492
1493/*******************************************************************************
1494 *
1495 * FUNCTION: acpi_os_delete_cache
1496 *
1497 * PARAMETERS: Cache - Handle to cache object
1498 *
1499 * RETURN: Status
1500 *
1501 * DESCRIPTION: Free all objects within the requested cache and delete the
1502 * cache object.
1503 *
1504 ******************************************************************************/
1505
1506acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1507{
1508 kmem_cache_destroy(cache);
1509 return (AE_OK);
1510}
1511
1512/*******************************************************************************
1513 *
1514 * FUNCTION: acpi_os_release_object
1515 *
1516 * PARAMETERS: Cache - Handle to cache object
1517 * Object - The object to be released
1518 *
1519 * RETURN: None
1520 *
1521 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1522 * the object is deleted.
1523 *
1524 ******************************************************************************/
1525
1526acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1527{
1528 kmem_cache_free(cache, object);
1529 return (AE_OK);
1530}
1531#endif
1532
1533acpi_status __init acpi_os_initialize(void)
1534{
1535 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1536 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1537 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1538 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1539
1540 return AE_OK;
1541}
1542
1543acpi_status __init acpi_os_initialize1(void)
1544{
1545 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1546 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1547 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1548 BUG_ON(!kacpid_wq);
1549 BUG_ON(!kacpi_notify_wq);
1550 BUG_ON(!kacpi_hotplug_wq);
1551 acpi_install_interface_handler(acpi_osi_handler);
1552 acpi_osi_setup_late();
1553 return AE_OK;
1554}
1555
1556acpi_status acpi_os_terminate(void)
1557{
1558 if (acpi_irq_handler) {
1559 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1560 acpi_irq_handler);
1561 }
1562
1563 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1564 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1565 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1566 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1567
1568 destroy_workqueue(kacpid_wq);
1569 destroy_workqueue(kacpi_notify_wq);
1570 destroy_workqueue(kacpi_hotplug_wq);
1571
1572 return AE_OK;
1573}
1574
1575acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1576 u32 pm1b_control)
1577{
1578 int rc = 0;
1579 if (__acpi_os_prepare_sleep)
1580 rc = __acpi_os_prepare_sleep(sleep_state,
1581 pm1a_control, pm1b_control);
1582 if (rc < 0)
1583 return AE_ERROR;
1584 else if (rc > 0)
1585 return AE_CTRL_SKIP;
1586
1587 return AE_OK;
1588}
1589
1590void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1591 u32 pm1a_ctrl, u32 pm1b_ctrl))
1592{
1593 __acpi_os_prepare_sleep = func;
1594}