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Merge branch 'for-2.6.29' of git://git.kernel.dk/linux-2.6-block
[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/efi.h>
42 #include <linux/ioport.h>
43 #include <linux/list.h>
44 #include <linux/jiffies.h>
45 #include <linux/semaphore.h>
46
47 #include <asm/io.h>
48 #include <asm/uaccess.h>
49
50 #include <acpi/acpi.h>
51 #include <acpi/acpi_bus.h>
52 #include <acpi/processor.h>
53
54 #define _COMPONENT ACPI_OS_SERVICES
55 ACPI_MODULE_NAME("osl");
56 #define PREFIX "ACPI: "
57 struct acpi_os_dpc {
58 acpi_osd_exec_callback function;
59 void *context;
60 struct work_struct work;
61 };
62
63 #ifdef CONFIG_ACPI_CUSTOM_DSDT
64 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
65 #endif
66
67 #ifdef ENABLE_DEBUGGER
68 #include <linux/kdb.h>
69
70 /* stuff for debugger support */
71 int acpi_in_debugger;
72 EXPORT_SYMBOL(acpi_in_debugger);
73
74 extern char line_buf[80];
75 #endif /*ENABLE_DEBUGGER */
76
77 static unsigned int acpi_irq_irq;
78 static acpi_osd_handler acpi_irq_handler;
79 static void *acpi_irq_context;
80 static struct workqueue_struct *kacpid_wq;
81 static struct workqueue_struct *kacpi_notify_wq;
82
83 struct acpi_res_list {
84 resource_size_t start;
85 resource_size_t end;
86 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
87 char name[5]; /* only can have a length of 4 chars, make use of this
88 one instead of res->name, no need to kalloc then */
89 struct list_head resource_list;
90 };
91
92 static LIST_HEAD(resource_list_head);
93 static DEFINE_SPINLOCK(acpi_res_lock);
94
95 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
96 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
97
98 /*
99 * The story of _OSI(Linux)
100 *
101 * From pre-history through Linux-2.6.22,
102 * Linux responded TRUE upon a BIOS OSI(Linux) query.
103 *
104 * Unfortunately, reference BIOS writers got wind of this
105 * and put OSI(Linux) in their example code, quickly exposing
106 * this string as ill-conceived and opening the door to
107 * an un-bounded number of BIOS incompatibilities.
108 *
109 * For example, OSI(Linux) was used on resume to re-POST a
110 * video card on one system, because Linux at that time
111 * could not do a speedy restore in its native driver.
112 * But then upon gaining quick native restore capability,
113 * Linux has no way to tell the BIOS to skip the time-consuming
114 * POST -- putting Linux at a permanent performance disadvantage.
115 * On another system, the BIOS writer used OSI(Linux)
116 * to infer native OS support for IPMI! On other systems,
117 * OSI(Linux) simply got in the way of Linux claiming to
118 * be compatible with other operating systems, exposing
119 * BIOS issues such as skipped device initialization.
120 *
121 * So "Linux" turned out to be a really poor chose of
122 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
123 *
124 * BIOS writers should NOT query _OSI(Linux) on future systems.
125 * Linux will complain on the console when it sees it, and return FALSE.
126 * To get Linux to return TRUE for your system will require
127 * a kernel source update to add a DMI entry,
128 * or boot with "acpi_osi=Linux"
129 */
130
131 static struct osi_linux {
132 unsigned int enable:1;
133 unsigned int dmi:1;
134 unsigned int cmdline:1;
135 unsigned int known:1;
136 } osi_linux = { 0, 0, 0, 0};
137
138 static void __init acpi_request_region (struct acpi_generic_address *addr,
139 unsigned int length, char *desc)
140 {
141 struct resource *res;
142
143 if (!addr->address || !length)
144 return;
145
146 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
147 res = request_region(addr->address, length, desc);
148 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
149 res = request_mem_region(addr->address, length, desc);
150 }
151
152 static int __init acpi_reserve_resources(void)
153 {
154 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
155 "ACPI PM1a_EVT_BLK");
156
157 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
158 "ACPI PM1b_EVT_BLK");
159
160 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
161 "ACPI PM1a_CNT_BLK");
162
163 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
164 "ACPI PM1b_CNT_BLK");
165
166 if (acpi_gbl_FADT.pm_timer_length == 4)
167 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
168
169 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
170 "ACPI PM2_CNT_BLK");
171
172 /* Length of GPE blocks must be a non-negative multiple of 2 */
173
174 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
175 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
176 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
177
178 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
179 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
180 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
181
182 return 0;
183 }
184 device_initcall(acpi_reserve_resources);
185
186 acpi_status __init acpi_os_initialize(void)
187 {
188 return AE_OK;
189 }
190
191 acpi_status acpi_os_initialize1(void)
192 {
193 kacpid_wq = create_singlethread_workqueue("kacpid");
194 kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
195 BUG_ON(!kacpid_wq);
196 BUG_ON(!kacpi_notify_wq);
197 return AE_OK;
198 }
199
200 acpi_status acpi_os_terminate(void)
201 {
202 if (acpi_irq_handler) {
203 acpi_os_remove_interrupt_handler(acpi_irq_irq,
204 acpi_irq_handler);
205 }
206
207 destroy_workqueue(kacpid_wq);
208 destroy_workqueue(kacpi_notify_wq);
209
210 return AE_OK;
211 }
212
213 void acpi_os_printf(const char *fmt, ...)
214 {
215 va_list args;
216 va_start(args, fmt);
217 acpi_os_vprintf(fmt, args);
218 va_end(args);
219 }
220
221 void acpi_os_vprintf(const char *fmt, va_list args)
222 {
223 static char buffer[512];
224
225 vsprintf(buffer, fmt, args);
226
227 #ifdef ENABLE_DEBUGGER
228 if (acpi_in_debugger) {
229 kdb_printf("%s", buffer);
230 } else {
231 printk("%s", buffer);
232 }
233 #else
234 printk("%s", buffer);
235 #endif
236 }
237
238 acpi_physical_address __init acpi_os_get_root_pointer(void)
239 {
240 if (efi_enabled) {
241 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
242 return efi.acpi20;
243 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
244 return efi.acpi;
245 else {
246 printk(KERN_ERR PREFIX
247 "System description tables not found\n");
248 return 0;
249 }
250 } else {
251 acpi_physical_address pa = 0;
252
253 acpi_find_root_pointer(&pa);
254 return pa;
255 }
256 }
257
258 void __iomem *__init_refok
259 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
260 {
261 if (phys > ULONG_MAX) {
262 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
263 return NULL;
264 }
265 if (acpi_gbl_permanent_mmap)
266 /*
267 * ioremap checks to ensure this is in reserved space
268 */
269 return ioremap((unsigned long)phys, size);
270 else
271 return __acpi_map_table((unsigned long)phys, size);
272 }
273 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
274
275 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
276 {
277 if (acpi_gbl_permanent_mmap) {
278 iounmap(virt);
279 }
280 }
281 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
282
283 #ifdef ACPI_FUTURE_USAGE
284 acpi_status
285 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
286 {
287 if (!phys || !virt)
288 return AE_BAD_PARAMETER;
289
290 *phys = virt_to_phys(virt);
291
292 return AE_OK;
293 }
294 #endif
295
296 #define ACPI_MAX_OVERRIDE_LEN 100
297
298 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
299
300 acpi_status
301 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
302 acpi_string * new_val)
303 {
304 if (!init_val || !new_val)
305 return AE_BAD_PARAMETER;
306
307 *new_val = NULL;
308 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
309 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
310 acpi_os_name);
311 *new_val = acpi_os_name;
312 }
313
314 return AE_OK;
315 }
316
317 acpi_status
318 acpi_os_table_override(struct acpi_table_header * existing_table,
319 struct acpi_table_header ** new_table)
320 {
321 if (!existing_table || !new_table)
322 return AE_BAD_PARAMETER;
323
324 *new_table = NULL;
325
326 #ifdef CONFIG_ACPI_CUSTOM_DSDT
327 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
328 *new_table = (struct acpi_table_header *)AmlCode;
329 #endif
330 if (*new_table != NULL) {
331 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
332 "this is unsafe: tainting kernel\n",
333 existing_table->signature,
334 existing_table->oem_table_id);
335 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
336 }
337 return AE_OK;
338 }
339
340 static irqreturn_t acpi_irq(int irq, void *dev_id)
341 {
342 u32 handled;
343
344 handled = (*acpi_irq_handler) (acpi_irq_context);
345
346 if (handled) {
347 acpi_irq_handled++;
348 return IRQ_HANDLED;
349 } else
350 return IRQ_NONE;
351 }
352
353 acpi_status
354 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
355 void *context)
356 {
357 unsigned int irq;
358
359 acpi_irq_stats_init();
360
361 /*
362 * Ignore the GSI from the core, and use the value in our copy of the
363 * FADT. It may not be the same if an interrupt source override exists
364 * for the SCI.
365 */
366 gsi = acpi_gbl_FADT.sci_interrupt;
367 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
368 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
369 gsi);
370 return AE_OK;
371 }
372
373 acpi_irq_handler = handler;
374 acpi_irq_context = context;
375 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
376 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
377 return AE_NOT_ACQUIRED;
378 }
379 acpi_irq_irq = irq;
380
381 return AE_OK;
382 }
383
384 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
385 {
386 if (irq) {
387 free_irq(irq, acpi_irq);
388 acpi_irq_handler = NULL;
389 acpi_irq_irq = 0;
390 }
391
392 return AE_OK;
393 }
394
395 /*
396 * Running in interpreter thread context, safe to sleep
397 */
398
399 void acpi_os_sleep(acpi_integer ms)
400 {
401 schedule_timeout_interruptible(msecs_to_jiffies(ms));
402 }
403
404 void acpi_os_stall(u32 us)
405 {
406 while (us) {
407 u32 delay = 1000;
408
409 if (delay > us)
410 delay = us;
411 udelay(delay);
412 touch_nmi_watchdog();
413 us -= delay;
414 }
415 }
416
417 /*
418 * Support ACPI 3.0 AML Timer operand
419 * Returns 64-bit free-running, monotonically increasing timer
420 * with 100ns granularity
421 */
422 u64 acpi_os_get_timer(void)
423 {
424 static u64 t;
425
426 #ifdef CONFIG_HPET
427 /* TBD: use HPET if available */
428 #endif
429
430 #ifdef CONFIG_X86_PM_TIMER
431 /* TBD: default to PM timer if HPET was not available */
432 #endif
433 if (!t)
434 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
435
436 return ++t;
437 }
438
439 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
440 {
441 u32 dummy;
442
443 if (!value)
444 value = &dummy;
445
446 *value = 0;
447 if (width <= 8) {
448 *(u8 *) value = inb(port);
449 } else if (width <= 16) {
450 *(u16 *) value = inw(port);
451 } else if (width <= 32) {
452 *(u32 *) value = inl(port);
453 } else {
454 BUG();
455 }
456
457 return AE_OK;
458 }
459
460 EXPORT_SYMBOL(acpi_os_read_port);
461
462 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
463 {
464 if (width <= 8) {
465 outb(value, port);
466 } else if (width <= 16) {
467 outw(value, port);
468 } else if (width <= 32) {
469 outl(value, port);
470 } else {
471 BUG();
472 }
473
474 return AE_OK;
475 }
476
477 EXPORT_SYMBOL(acpi_os_write_port);
478
479 acpi_status
480 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
481 {
482 u32 dummy;
483 void __iomem *virt_addr;
484
485 virt_addr = ioremap(phys_addr, width);
486 if (!value)
487 value = &dummy;
488
489 switch (width) {
490 case 8:
491 *(u8 *) value = readb(virt_addr);
492 break;
493 case 16:
494 *(u16 *) value = readw(virt_addr);
495 break;
496 case 32:
497 *(u32 *) value = readl(virt_addr);
498 break;
499 default:
500 BUG();
501 }
502
503 iounmap(virt_addr);
504
505 return AE_OK;
506 }
507
508 acpi_status
509 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
510 {
511 void __iomem *virt_addr;
512
513 virt_addr = ioremap(phys_addr, width);
514
515 switch (width) {
516 case 8:
517 writeb(value, virt_addr);
518 break;
519 case 16:
520 writew(value, virt_addr);
521 break;
522 case 32:
523 writel(value, virt_addr);
524 break;
525 default:
526 BUG();
527 }
528
529 iounmap(virt_addr);
530
531 return AE_OK;
532 }
533
534 acpi_status
535 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
536 u32 *value, u32 width)
537 {
538 int result, size;
539
540 if (!value)
541 return AE_BAD_PARAMETER;
542
543 switch (width) {
544 case 8:
545 size = 1;
546 break;
547 case 16:
548 size = 2;
549 break;
550 case 32:
551 size = 4;
552 break;
553 default:
554 return AE_ERROR;
555 }
556
557 result = raw_pci_read(pci_id->segment, pci_id->bus,
558 PCI_DEVFN(pci_id->device, pci_id->function),
559 reg, size, value);
560
561 return (result ? AE_ERROR : AE_OK);
562 }
563
564 acpi_status
565 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
566 acpi_integer value, u32 width)
567 {
568 int result, size;
569
570 switch (width) {
571 case 8:
572 size = 1;
573 break;
574 case 16:
575 size = 2;
576 break;
577 case 32:
578 size = 4;
579 break;
580 default:
581 return AE_ERROR;
582 }
583
584 result = raw_pci_write(pci_id->segment, pci_id->bus,
585 PCI_DEVFN(pci_id->device, pci_id->function),
586 reg, size, value);
587
588 return (result ? AE_ERROR : AE_OK);
589 }
590
591 /* TODO: Change code to take advantage of driver model more */
592 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */
593 acpi_handle chandle, /* current node */
594 struct acpi_pci_id **id,
595 int *is_bridge, u8 * bus_number)
596 {
597 acpi_handle handle;
598 struct acpi_pci_id *pci_id = *id;
599 acpi_status status;
600 unsigned long long temp;
601 acpi_object_type type;
602
603 acpi_get_parent(chandle, &handle);
604 if (handle != rhandle) {
605 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
606 bus_number);
607
608 status = acpi_get_type(handle, &type);
609 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
610 return;
611
612 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
613 &temp);
614 if (ACPI_SUCCESS(status)) {
615 u32 val;
616 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
617 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
618
619 if (*is_bridge)
620 pci_id->bus = *bus_number;
621
622 /* any nicer way to get bus number of bridge ? */
623 status =
624 acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
625 8);
626 if (ACPI_SUCCESS(status)
627 && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
628 status =
629 acpi_os_read_pci_configuration(pci_id, 0x18,
630 &val, 8);
631 if (!ACPI_SUCCESS(status)) {
632 /* Certainly broken... FIX ME */
633 return;
634 }
635 *is_bridge = 1;
636 pci_id->bus = val;
637 status =
638 acpi_os_read_pci_configuration(pci_id, 0x19,
639 &val, 8);
640 if (ACPI_SUCCESS(status)) {
641 *bus_number = val;
642 }
643 } else
644 *is_bridge = 0;
645 }
646 }
647 }
648
649 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */
650 acpi_handle chandle, /* current node */
651 struct acpi_pci_id **id)
652 {
653 int is_bridge = 1;
654 u8 bus_number = (*id)->bus;
655
656 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
657 }
658
659 static void acpi_os_execute_deferred(struct work_struct *work)
660 {
661 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
662 if (!dpc) {
663 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
664 return;
665 }
666
667 dpc->function(dpc->context);
668 kfree(dpc);
669
670 return;
671 }
672
673 static void acpi_os_execute_hp_deferred(struct work_struct *work)
674 {
675 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
676 if (!dpc) {
677 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
678 return;
679 }
680
681 acpi_os_wait_events_complete(NULL);
682
683 dpc->function(dpc->context);
684 kfree(dpc);
685
686 return;
687 }
688
689 /*******************************************************************************
690 *
691 * FUNCTION: acpi_os_execute
692 *
693 * PARAMETERS: Type - Type of the callback
694 * Function - Function to be executed
695 * Context - Function parameters
696 *
697 * RETURN: Status
698 *
699 * DESCRIPTION: Depending on type, either queues function for deferred execution or
700 * immediately executes function on a separate thread.
701 *
702 ******************************************************************************/
703
704 static acpi_status __acpi_os_execute(acpi_execute_type type,
705 acpi_osd_exec_callback function, void *context, int hp)
706 {
707 acpi_status status = AE_OK;
708 struct acpi_os_dpc *dpc;
709 struct workqueue_struct *queue;
710 int ret;
711 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
712 "Scheduling function [%p(%p)] for deferred execution.\n",
713 function, context));
714
715 if (!function)
716 return AE_BAD_PARAMETER;
717
718 /*
719 * Allocate/initialize DPC structure. Note that this memory will be
720 * freed by the callee. The kernel handles the work_struct list in a
721 * way that allows us to also free its memory inside the callee.
722 * Because we may want to schedule several tasks with different
723 * parameters we can't use the approach some kernel code uses of
724 * having a static work_struct.
725 */
726
727 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
728 if (!dpc)
729 return AE_NO_MEMORY;
730
731 dpc->function = function;
732 dpc->context = context;
733
734 if (!hp) {
735 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
736 queue = (type == OSL_NOTIFY_HANDLER) ?
737 kacpi_notify_wq : kacpid_wq;
738 ret = queue_work(queue, &dpc->work);
739 } else {
740 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
741 ret = schedule_work(&dpc->work);
742 }
743
744 if (!ret) {
745 printk(KERN_ERR PREFIX
746 "Call to queue_work() failed.\n");
747 status = AE_ERROR;
748 kfree(dpc);
749 }
750 return status;
751 }
752
753 acpi_status acpi_os_execute(acpi_execute_type type,
754 acpi_osd_exec_callback function, void *context)
755 {
756 return __acpi_os_execute(type, function, context, 0);
757 }
758 EXPORT_SYMBOL(acpi_os_execute);
759
760 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
761 void *context)
762 {
763 return __acpi_os_execute(0, function, context, 1);
764 }
765
766 void acpi_os_wait_events_complete(void *context)
767 {
768 flush_workqueue(kacpid_wq);
769 flush_workqueue(kacpi_notify_wq);
770 }
771
772 EXPORT_SYMBOL(acpi_os_wait_events_complete);
773
774 /*
775 * Allocate the memory for a spinlock and initialize it.
776 */
777 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
778 {
779 spin_lock_init(*handle);
780
781 return AE_OK;
782 }
783
784 /*
785 * Deallocate the memory for a spinlock.
786 */
787 void acpi_os_delete_lock(acpi_spinlock handle)
788 {
789 return;
790 }
791
792 acpi_status
793 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
794 {
795 struct semaphore *sem = NULL;
796
797 sem = acpi_os_allocate(sizeof(struct semaphore));
798 if (!sem)
799 return AE_NO_MEMORY;
800 memset(sem, 0, sizeof(struct semaphore));
801
802 sema_init(sem, initial_units);
803
804 *handle = (acpi_handle *) sem;
805
806 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
807 *handle, initial_units));
808
809 return AE_OK;
810 }
811
812 /*
813 * TODO: A better way to delete semaphores? Linux doesn't have a
814 * 'delete_semaphore()' function -- may result in an invalid
815 * pointer dereference for non-synchronized consumers. Should
816 * we at least check for blocked threads and signal/cancel them?
817 */
818
819 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
820 {
821 struct semaphore *sem = (struct semaphore *)handle;
822
823 if (!sem)
824 return AE_BAD_PARAMETER;
825
826 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
827
828 BUG_ON(!list_empty(&sem->wait_list));
829 kfree(sem);
830 sem = NULL;
831
832 return AE_OK;
833 }
834
835 /*
836 * TODO: Support for units > 1?
837 */
838 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
839 {
840 acpi_status status = AE_OK;
841 struct semaphore *sem = (struct semaphore *)handle;
842 long jiffies;
843 int ret = 0;
844
845 if (!sem || (units < 1))
846 return AE_BAD_PARAMETER;
847
848 if (units > 1)
849 return AE_SUPPORT;
850
851 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
852 handle, units, timeout));
853
854 if (timeout == ACPI_WAIT_FOREVER)
855 jiffies = MAX_SCHEDULE_TIMEOUT;
856 else
857 jiffies = msecs_to_jiffies(timeout);
858
859 ret = down_timeout(sem, jiffies);
860 if (ret)
861 status = AE_TIME;
862
863 if (ACPI_FAILURE(status)) {
864 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
865 "Failed to acquire semaphore[%p|%d|%d], %s",
866 handle, units, timeout,
867 acpi_format_exception(status)));
868 } else {
869 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
870 "Acquired semaphore[%p|%d|%d]", handle,
871 units, timeout));
872 }
873
874 return status;
875 }
876
877 /*
878 * TODO: Support for units > 1?
879 */
880 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
881 {
882 struct semaphore *sem = (struct semaphore *)handle;
883
884 if (!sem || (units < 1))
885 return AE_BAD_PARAMETER;
886
887 if (units > 1)
888 return AE_SUPPORT;
889
890 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
891 units));
892
893 up(sem);
894
895 return AE_OK;
896 }
897
898 #ifdef ACPI_FUTURE_USAGE
899 u32 acpi_os_get_line(char *buffer)
900 {
901
902 #ifdef ENABLE_DEBUGGER
903 if (acpi_in_debugger) {
904 u32 chars;
905
906 kdb_read(buffer, sizeof(line_buf));
907
908 /* remove the CR kdb includes */
909 chars = strlen(buffer) - 1;
910 buffer[chars] = '\0';
911 }
912 #endif
913
914 return 0;
915 }
916 #endif /* ACPI_FUTURE_USAGE */
917
918 acpi_status acpi_os_signal(u32 function, void *info)
919 {
920 switch (function) {
921 case ACPI_SIGNAL_FATAL:
922 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
923 break;
924 case ACPI_SIGNAL_BREAKPOINT:
925 /*
926 * AML Breakpoint
927 * ACPI spec. says to treat it as a NOP unless
928 * you are debugging. So if/when we integrate
929 * AML debugger into the kernel debugger its
930 * hook will go here. But until then it is
931 * not useful to print anything on breakpoints.
932 */
933 break;
934 default:
935 break;
936 }
937
938 return AE_OK;
939 }
940
941 static int __init acpi_os_name_setup(char *str)
942 {
943 char *p = acpi_os_name;
944 int count = ACPI_MAX_OVERRIDE_LEN - 1;
945
946 if (!str || !*str)
947 return 0;
948
949 for (; count-- && str && *str; str++) {
950 if (isalnum(*str) || *str == ' ' || *str == ':')
951 *p++ = *str;
952 else if (*str == '\'' || *str == '"')
953 continue;
954 else
955 break;
956 }
957 *p = 0;
958
959 return 1;
960
961 }
962
963 __setup("acpi_os_name=", acpi_os_name_setup);
964
965 static void __init set_osi_linux(unsigned int enable)
966 {
967 if (osi_linux.enable != enable) {
968 osi_linux.enable = enable;
969 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
970 enable ? "Add": "Delet");
971 }
972 return;
973 }
974
975 static void __init acpi_cmdline_osi_linux(unsigned int enable)
976 {
977 osi_linux.cmdline = 1; /* cmdline set the default */
978 set_osi_linux(enable);
979
980 return;
981 }
982
983 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
984 {
985 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
986
987 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
988
989 if (enable == -1)
990 return;
991
992 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
993
994 set_osi_linux(enable);
995
996 return;
997 }
998
999 /*
1000 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1001 *
1002 * empty string disables _OSI
1003 * string starting with '!' disables that string
1004 * otherwise string is added to list, augmenting built-in strings
1005 */
1006 int __init acpi_osi_setup(char *str)
1007 {
1008 if (str == NULL || *str == '\0') {
1009 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1010 acpi_gbl_create_osi_method = FALSE;
1011 } else if (!strcmp("!Linux", str)) {
1012 acpi_cmdline_osi_linux(0); /* !enable */
1013 } else if (*str == '!') {
1014 if (acpi_osi_invalidate(++str) == AE_OK)
1015 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1016 } else if (!strcmp("Linux", str)) {
1017 acpi_cmdline_osi_linux(1); /* enable */
1018 } else if (*osi_additional_string == '\0') {
1019 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1020 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1021 }
1022
1023 return 1;
1024 }
1025
1026 __setup("acpi_osi=", acpi_osi_setup);
1027
1028 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1029 static int __init acpi_serialize_setup(char *str)
1030 {
1031 printk(KERN_INFO PREFIX "serialize enabled\n");
1032
1033 acpi_gbl_all_methods_serialized = TRUE;
1034
1035 return 1;
1036 }
1037
1038 __setup("acpi_serialize", acpi_serialize_setup);
1039
1040 /*
1041 * Wake and Run-Time GPES are expected to be separate.
1042 * We disable wake-GPEs at run-time to prevent spurious
1043 * interrupts.
1044 *
1045 * However, if a system exists that shares Wake and
1046 * Run-time events on the same GPE this flag is available
1047 * to tell Linux to keep the wake-time GPEs enabled at run-time.
1048 */
1049 static int __init acpi_wake_gpes_always_on_setup(char *str)
1050 {
1051 printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1052
1053 acpi_gbl_leave_wake_gpes_disabled = FALSE;
1054
1055 return 1;
1056 }
1057
1058 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1059
1060 /* Check of resource interference between native drivers and ACPI
1061 * OperationRegions (SystemIO and System Memory only).
1062 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1063 * in arbitrary AML code and can interfere with legacy drivers.
1064 * acpi_enforce_resources= can be set to:
1065 *
1066 * - strict (2)
1067 * -> further driver trying to access the resources will not load
1068 * - lax (default) (1)
1069 * -> further driver trying to access the resources will load, but you
1070 * get a system message that something might go wrong...
1071 *
1072 * - no (0)
1073 * -> ACPI Operation Region resources will not be registered
1074 *
1075 */
1076 #define ENFORCE_RESOURCES_STRICT 2
1077 #define ENFORCE_RESOURCES_LAX 1
1078 #define ENFORCE_RESOURCES_NO 0
1079
1080 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1081
1082 static int __init acpi_enforce_resources_setup(char *str)
1083 {
1084 if (str == NULL || *str == '\0')
1085 return 0;
1086
1087 if (!strcmp("strict", str))
1088 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1089 else if (!strcmp("lax", str))
1090 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1091 else if (!strcmp("no", str))
1092 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1093
1094 return 1;
1095 }
1096
1097 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1098
1099 /* Check for resource conflicts between ACPI OperationRegions and native
1100 * drivers */
1101 int acpi_check_resource_conflict(struct resource *res)
1102 {
1103 struct acpi_res_list *res_list_elem;
1104 int ioport;
1105 int clash = 0;
1106
1107 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1108 return 0;
1109 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1110 return 0;
1111
1112 ioport = res->flags & IORESOURCE_IO;
1113
1114 spin_lock(&acpi_res_lock);
1115 list_for_each_entry(res_list_elem, &resource_list_head,
1116 resource_list) {
1117 if (ioport && (res_list_elem->resource_type
1118 != ACPI_ADR_SPACE_SYSTEM_IO))
1119 continue;
1120 if (!ioport && (res_list_elem->resource_type
1121 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1122 continue;
1123
1124 if (res->end < res_list_elem->start
1125 || res_list_elem->end < res->start)
1126 continue;
1127 clash = 1;
1128 break;
1129 }
1130 spin_unlock(&acpi_res_lock);
1131
1132 if (clash) {
1133 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1134 printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1135 " conflicts with ACPI region %s"
1136 " [0x%llx-0x%llx]\n",
1137 acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1138 ? KERN_WARNING : KERN_ERR,
1139 ioport ? "I/O" : "Memory", res->name,
1140 (long long) res->start, (long long) res->end,
1141 res_list_elem->name,
1142 (long long) res_list_elem->start,
1143 (long long) res_list_elem->end);
1144 printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1145 }
1146 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1147 return -EBUSY;
1148 }
1149 return 0;
1150 }
1151 EXPORT_SYMBOL(acpi_check_resource_conflict);
1152
1153 int acpi_check_region(resource_size_t start, resource_size_t n,
1154 const char *name)
1155 {
1156 struct resource res = {
1157 .start = start,
1158 .end = start + n - 1,
1159 .name = name,
1160 .flags = IORESOURCE_IO,
1161 };
1162
1163 return acpi_check_resource_conflict(&res);
1164 }
1165 EXPORT_SYMBOL(acpi_check_region);
1166
1167 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1168 const char *name)
1169 {
1170 struct resource res = {
1171 .start = start,
1172 .end = start + n - 1,
1173 .name = name,
1174 .flags = IORESOURCE_MEM,
1175 };
1176
1177 return acpi_check_resource_conflict(&res);
1178
1179 }
1180 EXPORT_SYMBOL(acpi_check_mem_region);
1181
1182 /*
1183 * Acquire a spinlock.
1184 *
1185 * handle is a pointer to the spinlock_t.
1186 */
1187
1188 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1189 {
1190 acpi_cpu_flags flags;
1191 spin_lock_irqsave(lockp, flags);
1192 return flags;
1193 }
1194
1195 /*
1196 * Release a spinlock. See above.
1197 */
1198
1199 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1200 {
1201 spin_unlock_irqrestore(lockp, flags);
1202 }
1203
1204 #ifndef ACPI_USE_LOCAL_CACHE
1205
1206 /*******************************************************************************
1207 *
1208 * FUNCTION: acpi_os_create_cache
1209 *
1210 * PARAMETERS: name - Ascii name for the cache
1211 * size - Size of each cached object
1212 * depth - Maximum depth of the cache (in objects) <ignored>
1213 * cache - Where the new cache object is returned
1214 *
1215 * RETURN: status
1216 *
1217 * DESCRIPTION: Create a cache object
1218 *
1219 ******************************************************************************/
1220
1221 acpi_status
1222 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1223 {
1224 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1225 if (*cache == NULL)
1226 return AE_ERROR;
1227 else
1228 return AE_OK;
1229 }
1230
1231 /*******************************************************************************
1232 *
1233 * FUNCTION: acpi_os_purge_cache
1234 *
1235 * PARAMETERS: Cache - Handle to cache object
1236 *
1237 * RETURN: Status
1238 *
1239 * DESCRIPTION: Free all objects within the requested cache.
1240 *
1241 ******************************************************************************/
1242
1243 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1244 {
1245 kmem_cache_shrink(cache);
1246 return (AE_OK);
1247 }
1248
1249 /*******************************************************************************
1250 *
1251 * FUNCTION: acpi_os_delete_cache
1252 *
1253 * PARAMETERS: Cache - Handle to cache object
1254 *
1255 * RETURN: Status
1256 *
1257 * DESCRIPTION: Free all objects within the requested cache and delete the
1258 * cache object.
1259 *
1260 ******************************************************************************/
1261
1262 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1263 {
1264 kmem_cache_destroy(cache);
1265 return (AE_OK);
1266 }
1267
1268 /*******************************************************************************
1269 *
1270 * FUNCTION: acpi_os_release_object
1271 *
1272 * PARAMETERS: Cache - Handle to cache object
1273 * Object - The object to be released
1274 *
1275 * RETURN: None
1276 *
1277 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1278 * the object is deleted.
1279 *
1280 ******************************************************************************/
1281
1282 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1283 {
1284 kmem_cache_free(cache, object);
1285 return (AE_OK);
1286 }
1287
1288 /******************************************************************************
1289 *
1290 * FUNCTION: acpi_os_validate_interface
1291 *
1292 * PARAMETERS: interface - Requested interface to be validated
1293 *
1294 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise
1295 *
1296 * DESCRIPTION: Match an interface string to the interfaces supported by the
1297 * host. Strings originate from an AML call to the _OSI method.
1298 *
1299 *****************************************************************************/
1300
1301 acpi_status
1302 acpi_os_validate_interface (char *interface)
1303 {
1304 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1305 return AE_OK;
1306 if (!strcmp("Linux", interface)) {
1307
1308 printk(KERN_NOTICE PREFIX
1309 "BIOS _OSI(Linux) query %s%s\n",
1310 osi_linux.enable ? "honored" : "ignored",
1311 osi_linux.cmdline ? " via cmdline" :
1312 osi_linux.dmi ? " via DMI" : "");
1313
1314 if (osi_linux.enable)
1315 return AE_OK;
1316 }
1317 return AE_SUPPORT;
1318 }
1319
1320 /******************************************************************************
1321 *
1322 * FUNCTION: acpi_os_validate_address
1323 *
1324 * PARAMETERS: space_id - ACPI space ID
1325 * address - Physical address
1326 * length - Address length
1327 *
1328 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1329 * should return AE_AML_ILLEGAL_ADDRESS.
1330 *
1331 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1332 * the addresses accessed by AML operation regions.
1333 *
1334 *****************************************************************************/
1335
1336 acpi_status
1337 acpi_os_validate_address (
1338 u8 space_id,
1339 acpi_physical_address address,
1340 acpi_size length,
1341 char *name)
1342 {
1343 struct acpi_res_list *res;
1344 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1345 return AE_OK;
1346
1347 switch (space_id) {
1348 case ACPI_ADR_SPACE_SYSTEM_IO:
1349 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1350 /* Only interference checks against SystemIO and SytemMemory
1351 are needed */
1352 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1353 if (!res)
1354 return AE_OK;
1355 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1356 strlcpy(res->name, name, 5);
1357 res->start = address;
1358 res->end = address + length - 1;
1359 res->resource_type = space_id;
1360 spin_lock(&acpi_res_lock);
1361 list_add(&res->resource_list, &resource_list_head);
1362 spin_unlock(&acpi_res_lock);
1363 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1364 "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1365 ? "SystemIO" : "System Memory",
1366 (unsigned long long)res->start,
1367 (unsigned long long)res->end,
1368 res->name);
1369 break;
1370 case ACPI_ADR_SPACE_PCI_CONFIG:
1371 case ACPI_ADR_SPACE_EC:
1372 case ACPI_ADR_SPACE_SMBUS:
1373 case ACPI_ADR_SPACE_CMOS:
1374 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1375 case ACPI_ADR_SPACE_DATA_TABLE:
1376 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1377 break;
1378 }
1379 return AE_OK;
1380 }
1381
1382 #endif
Linux kernel - Deliverables
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