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ACPICA: Fix acpi_os_read_pci_configuration prototype
[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 int wait;
62 };
63
64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
66 #endif
67
68 #ifdef ENABLE_DEBUGGER
69 #include <linux/kdb.h>
70
71 /* stuff for debugger support */
72 int acpi_in_debugger;
73 EXPORT_SYMBOL(acpi_in_debugger);
74
75 extern char line_buf[80];
76 #endif /*ENABLE_DEBUGGER */
77
78 static unsigned int acpi_irq_irq;
79 static acpi_osd_handler acpi_irq_handler;
80 static void *acpi_irq_context;
81 static struct workqueue_struct *kacpid_wq;
82 static struct workqueue_struct *kacpi_notify_wq;
83 static struct workqueue_struct *kacpi_hotplug_wq;
84
85 struct 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
95 static LIST_HEAD(resource_list_head);
96 static DEFINE_SPINLOCK(acpi_res_lock);
97
98 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
99 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
100
101 /*
102 * The story of _OSI(Linux)
103 *
104 * From pre-history through Linux-2.6.22,
105 * Linux responded TRUE upon a BIOS OSI(Linux) query.
106 *
107 * Unfortunately, reference BIOS writers got wind of this
108 * and put OSI(Linux) in their example code, quickly exposing
109 * this string as ill-conceived and opening the door to
110 * an un-bounded number of BIOS incompatibilities.
111 *
112 * For example, OSI(Linux) was used on resume to re-POST a
113 * video card on one system, because Linux at that time
114 * could not do a speedy restore in its native driver.
115 * But then upon gaining quick native restore capability,
116 * Linux has no way to tell the BIOS to skip the time-consuming
117 * POST -- putting Linux at a permanent performance disadvantage.
118 * On another system, the BIOS writer used OSI(Linux)
119 * to infer native OS support for IPMI! On other systems,
120 * OSI(Linux) simply got in the way of Linux claiming to
121 * be compatible with other operating systems, exposing
122 * BIOS issues such as skipped device initialization.
123 *
124 * So "Linux" turned out to be a really poor chose of
125 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
126 *
127 * BIOS writers should NOT query _OSI(Linux) on future systems.
128 * Linux will complain on the console when it sees it, and return FALSE.
129 * To get Linux to return TRUE for your system will require
130 * a kernel source update to add a DMI entry,
131 * or boot with "acpi_osi=Linux"
132 */
133
134 static struct osi_linux {
135 unsigned int enable:1;
136 unsigned int dmi:1;
137 unsigned int cmdline:1;
138 unsigned int known:1;
139 } osi_linux = { 0, 0, 0, 0};
140
141 static void __init acpi_request_region (struct acpi_generic_address *addr,
142 unsigned int length, char *desc)
143 {
144 if (!addr->address || !length)
145 return;
146
147 /* Resources are never freed */
148 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
149 request_region(addr->address, length, desc);
150 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
151 request_mem_region(addr->address, length, desc);
152 }
153
154 static int __init acpi_reserve_resources(void)
155 {
156 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
157 "ACPI PM1a_EVT_BLK");
158
159 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
160 "ACPI PM1b_EVT_BLK");
161
162 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
163 "ACPI PM1a_CNT_BLK");
164
165 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
166 "ACPI PM1b_CNT_BLK");
167
168 if (acpi_gbl_FADT.pm_timer_length == 4)
169 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
170
171 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
172 "ACPI PM2_CNT_BLK");
173
174 /* Length of GPE blocks must be a non-negative multiple of 2 */
175
176 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
177 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
178 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
179
180 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
181 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
182 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
183
184 return 0;
185 }
186 device_initcall(acpi_reserve_resources);
187
188 acpi_status __init acpi_os_initialize(void)
189 {
190 return AE_OK;
191 }
192
193 acpi_status acpi_os_initialize1(void)
194 {
195 kacpid_wq = create_workqueue("kacpid");
196 kacpi_notify_wq = create_workqueue("kacpi_notify");
197 kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
198 BUG_ON(!kacpid_wq);
199 BUG_ON(!kacpi_notify_wq);
200 BUG_ON(!kacpi_hotplug_wq);
201 return AE_OK;
202 }
203
204 acpi_status acpi_os_terminate(void)
205 {
206 if (acpi_irq_handler) {
207 acpi_os_remove_interrupt_handler(acpi_irq_irq,
208 acpi_irq_handler);
209 }
210
211 destroy_workqueue(kacpid_wq);
212 destroy_workqueue(kacpi_notify_wq);
213 destroy_workqueue(kacpi_hotplug_wq);
214
215 return AE_OK;
216 }
217
218 void acpi_os_printf(const char *fmt, ...)
219 {
220 va_list args;
221 va_start(args, fmt);
222 acpi_os_vprintf(fmt, args);
223 va_end(args);
224 }
225
226 void acpi_os_vprintf(const char *fmt, va_list args)
227 {
228 static char buffer[512];
229
230 vsprintf(buffer, fmt, args);
231
232 #ifdef ENABLE_DEBUGGER
233 if (acpi_in_debugger) {
234 kdb_printf("%s", buffer);
235 } else {
236 printk(KERN_CONT "%s", buffer);
237 }
238 #else
239 printk(KERN_CONT "%s", buffer);
240 #endif
241 }
242
243 acpi_physical_address __init acpi_os_get_root_pointer(void)
244 {
245 if (efi_enabled) {
246 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
247 return efi.acpi20;
248 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
249 return efi.acpi;
250 else {
251 printk(KERN_ERR PREFIX
252 "System description tables not found\n");
253 return 0;
254 }
255 } else {
256 acpi_physical_address pa = 0;
257
258 acpi_find_root_pointer(&pa);
259 return pa;
260 }
261 }
262
263 void __iomem *__init_refok
264 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
265 {
266 if (phys > ULONG_MAX) {
267 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
268 return NULL;
269 }
270 if (acpi_gbl_permanent_mmap)
271 /*
272 * ioremap checks to ensure this is in reserved space
273 */
274 return ioremap((unsigned long)phys, size);
275 else
276 return __acpi_map_table((unsigned long)phys, size);
277 }
278 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
279
280 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
281 {
282 if (acpi_gbl_permanent_mmap)
283 iounmap(virt);
284 else
285 __acpi_unmap_table(virt, size);
286 }
287 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
288
289 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
290 {
291 if (!acpi_gbl_permanent_mmap)
292 __acpi_unmap_table(virt, size);
293 }
294
295 #ifdef ACPI_FUTURE_USAGE
296 acpi_status
297 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
298 {
299 if (!phys || !virt)
300 return AE_BAD_PARAMETER;
301
302 *phys = virt_to_phys(virt);
303
304 return AE_OK;
305 }
306 #endif
307
308 #define ACPI_MAX_OVERRIDE_LEN 100
309
310 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
311
312 acpi_status
313 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
314 acpi_string * new_val)
315 {
316 if (!init_val || !new_val)
317 return AE_BAD_PARAMETER;
318
319 *new_val = NULL;
320 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
321 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
322 acpi_os_name);
323 *new_val = acpi_os_name;
324 }
325
326 return AE_OK;
327 }
328
329 acpi_status
330 acpi_os_table_override(struct acpi_table_header * existing_table,
331 struct acpi_table_header ** new_table)
332 {
333 if (!existing_table || !new_table)
334 return AE_BAD_PARAMETER;
335
336 *new_table = NULL;
337
338 #ifdef CONFIG_ACPI_CUSTOM_DSDT
339 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
340 *new_table = (struct acpi_table_header *)AmlCode;
341 #endif
342 if (*new_table != NULL) {
343 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
344 "this is unsafe: tainting kernel\n",
345 existing_table->signature,
346 existing_table->oem_table_id);
347 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
348 }
349 return AE_OK;
350 }
351
352 static irqreturn_t acpi_irq(int irq, void *dev_id)
353 {
354 u32 handled;
355
356 handled = (*acpi_irq_handler) (acpi_irq_context);
357
358 if (handled) {
359 acpi_irq_handled++;
360 return IRQ_HANDLED;
361 } else {
362 acpi_irq_not_handled++;
363 return IRQ_NONE;
364 }
365 }
366
367 acpi_status
368 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
369 void *context)
370 {
371 unsigned int irq;
372
373 acpi_irq_stats_init();
374
375 /*
376 * Ignore the GSI from the core, and use the value in our copy of the
377 * FADT. It may not be the same if an interrupt source override exists
378 * for the SCI.
379 */
380 gsi = acpi_gbl_FADT.sci_interrupt;
381 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
382 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
383 gsi);
384 return AE_OK;
385 }
386
387 acpi_irq_handler = handler;
388 acpi_irq_context = context;
389 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
390 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
391 return AE_NOT_ACQUIRED;
392 }
393 acpi_irq_irq = irq;
394
395 return AE_OK;
396 }
397
398 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
399 {
400 if (irq) {
401 free_irq(irq, acpi_irq);
402 acpi_irq_handler = NULL;
403 acpi_irq_irq = 0;
404 }
405
406 return AE_OK;
407 }
408
409 /*
410 * Running in interpreter thread context, safe to sleep
411 */
412
413 void acpi_os_sleep(u64 ms)
414 {
415 schedule_timeout_interruptible(msecs_to_jiffies(ms));
416 }
417
418 void acpi_os_stall(u32 us)
419 {
420 while (us) {
421 u32 delay = 1000;
422
423 if (delay > us)
424 delay = us;
425 udelay(delay);
426 touch_nmi_watchdog();
427 us -= delay;
428 }
429 }
430
431 /*
432 * Support ACPI 3.0 AML Timer operand
433 * Returns 64-bit free-running, monotonically increasing timer
434 * with 100ns granularity
435 */
436 u64 acpi_os_get_timer(void)
437 {
438 static u64 t;
439
440 #ifdef CONFIG_HPET
441 /* TBD: use HPET if available */
442 #endif
443
444 #ifdef CONFIG_X86_PM_TIMER
445 /* TBD: default to PM timer if HPET was not available */
446 #endif
447 if (!t)
448 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
449
450 return ++t;
451 }
452
453 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
454 {
455 u32 dummy;
456
457 if (!value)
458 value = &dummy;
459
460 *value = 0;
461 if (width <= 8) {
462 *(u8 *) value = inb(port);
463 } else if (width <= 16) {
464 *(u16 *) value = inw(port);
465 } else if (width <= 32) {
466 *(u32 *) value = inl(port);
467 } else {
468 BUG();
469 }
470
471 return AE_OK;
472 }
473
474 EXPORT_SYMBOL(acpi_os_read_port);
475
476 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
477 {
478 if (width <= 8) {
479 outb(value, port);
480 } else if (width <= 16) {
481 outw(value, port);
482 } else if (width <= 32) {
483 outl(value, port);
484 } else {
485 BUG();
486 }
487
488 return AE_OK;
489 }
490
491 EXPORT_SYMBOL(acpi_os_write_port);
492
493 acpi_status
494 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
495 {
496 u32 dummy;
497 void __iomem *virt_addr;
498
499 virt_addr = ioremap(phys_addr, width);
500 if (!value)
501 value = &dummy;
502
503 switch (width) {
504 case 8:
505 *(u8 *) value = readb(virt_addr);
506 break;
507 case 16:
508 *(u16 *) value = readw(virt_addr);
509 break;
510 case 32:
511 *(u32 *) value = readl(virt_addr);
512 break;
513 default:
514 BUG();
515 }
516
517 iounmap(virt_addr);
518
519 return AE_OK;
520 }
521
522 acpi_status
523 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
524 {
525 void __iomem *virt_addr;
526
527 virt_addr = ioremap(phys_addr, width);
528
529 switch (width) {
530 case 8:
531 writeb(value, virt_addr);
532 break;
533 case 16:
534 writew(value, virt_addr);
535 break;
536 case 32:
537 writel(value, virt_addr);
538 break;
539 default:
540 BUG();
541 }
542
543 iounmap(virt_addr);
544
545 return AE_OK;
546 }
547
548 acpi_status
549 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
550 u64 *value, u32 width)
551 {
552 int result, size;
553 u32 value32;
554
555 if (!value)
556 return AE_BAD_PARAMETER;
557
558 switch (width) {
559 case 8:
560 size = 1;
561 break;
562 case 16:
563 size = 2;
564 break;
565 case 32:
566 size = 4;
567 break;
568 default:
569 return AE_ERROR;
570 }
571
572 result = raw_pci_read(pci_id->segment, pci_id->bus,
573 PCI_DEVFN(pci_id->device, pci_id->function),
574 reg, size, &value32);
575 *value = value32;
576
577 return (result ? AE_ERROR : AE_OK);
578 }
579
580 acpi_status
581 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
582 u64 value, u32 width)
583 {
584 int result, size;
585
586 switch (width) {
587 case 8:
588 size = 1;
589 break;
590 case 16:
591 size = 2;
592 break;
593 case 32:
594 size = 4;
595 break;
596 default:
597 return AE_ERROR;
598 }
599
600 result = raw_pci_write(pci_id->segment, pci_id->bus,
601 PCI_DEVFN(pci_id->device, pci_id->function),
602 reg, size, value);
603
604 return (result ? AE_ERROR : AE_OK);
605 }
606
607 /* TODO: Change code to take advantage of driver model more */
608 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */
609 acpi_handle chandle, /* current node */
610 struct acpi_pci_id **id,
611 int *is_bridge, u8 * bus_number)
612 {
613 acpi_handle handle;
614 struct acpi_pci_id *pci_id = *id;
615 acpi_status status;
616 unsigned long long temp;
617 acpi_object_type type;
618
619 acpi_get_parent(chandle, &handle);
620 if (handle != rhandle) {
621 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
622 bus_number);
623
624 status = acpi_get_type(handle, &type);
625 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
626 return;
627
628 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
629 &temp);
630 if (ACPI_SUCCESS(status)) {
631 u64 val;
632 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
633 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
634
635 if (*is_bridge)
636 pci_id->bus = *bus_number;
637
638 /* any nicer way to get bus number of bridge ? */
639 status =
640 acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
641 8);
642 if (ACPI_SUCCESS(status)
643 && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
644 status =
645 acpi_os_read_pci_configuration(pci_id, 0x18,
646 &val, 8);
647 if (!ACPI_SUCCESS(status)) {
648 /* Certainly broken... FIX ME */
649 return;
650 }
651 *is_bridge = 1;
652 pci_id->bus = val;
653 status =
654 acpi_os_read_pci_configuration(pci_id, 0x19,
655 &val, 8);
656 if (ACPI_SUCCESS(status)) {
657 *bus_number = val;
658 }
659 } else
660 *is_bridge = 0;
661 }
662 }
663 }
664
665 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */
666 acpi_handle chandle, /* current node */
667 struct acpi_pci_id **id)
668 {
669 int is_bridge = 1;
670 u8 bus_number = (*id)->bus;
671
672 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
673 }
674
675 static void acpi_os_execute_deferred(struct work_struct *work)
676 {
677 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
678
679 if (dpc->wait)
680 acpi_os_wait_events_complete(NULL);
681
682 dpc->function(dpc->context);
683 kfree(dpc);
684 }
685
686 /*******************************************************************************
687 *
688 * FUNCTION: acpi_os_execute
689 *
690 * PARAMETERS: Type - Type of the callback
691 * Function - Function to be executed
692 * Context - Function parameters
693 *
694 * RETURN: Status
695 *
696 * DESCRIPTION: Depending on type, either queues function for deferred execution or
697 * immediately executes function on a separate thread.
698 *
699 ******************************************************************************/
700
701 static acpi_status __acpi_os_execute(acpi_execute_type type,
702 acpi_osd_exec_callback function, void *context, int hp)
703 {
704 acpi_status status = AE_OK;
705 struct acpi_os_dpc *dpc;
706 struct workqueue_struct *queue;
707 int ret;
708 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
709 "Scheduling function [%p(%p)] for deferred execution.\n",
710 function, context));
711
712 /*
713 * Allocate/initialize DPC structure. Note that this memory will be
714 * freed by the callee. The kernel handles the work_struct list in a
715 * way that allows us to also free its memory inside the callee.
716 * Because we may want to schedule several tasks with different
717 * parameters we can't use the approach some kernel code uses of
718 * having a static work_struct.
719 */
720
721 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
722 if (!dpc)
723 return AE_NO_MEMORY;
724
725 dpc->function = function;
726 dpc->context = context;
727
728 /*
729 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
730 * because the hotplug code may call driver .remove() functions,
731 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
732 * to flush these workqueues.
733 */
734 queue = hp ? kacpi_hotplug_wq :
735 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
736 dpc->wait = hp ? 1 : 0;
737
738 if (queue == kacpi_hotplug_wq)
739 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
740 else if (queue == kacpi_notify_wq)
741 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
742 else
743 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
744
745 /*
746 * On some machines, a software-initiated SMI causes corruption unless
747 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
748 * typically it's done in GPE-related methods that are run via
749 * workqueues, so we can avoid the known corruption cases by always
750 * queueing on CPU 0.
751 */
752 ret = queue_work_on(0, queue, &dpc->work);
753
754 if (!ret) {
755 printk(KERN_ERR PREFIX
756 "Call to queue_work() failed.\n");
757 status = AE_ERROR;
758 kfree(dpc);
759 }
760 return status;
761 }
762
763 acpi_status acpi_os_execute(acpi_execute_type type,
764 acpi_osd_exec_callback function, void *context)
765 {
766 return __acpi_os_execute(type, function, context, 0);
767 }
768 EXPORT_SYMBOL(acpi_os_execute);
769
770 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
771 void *context)
772 {
773 return __acpi_os_execute(0, function, context, 1);
774 }
775
776 void acpi_os_wait_events_complete(void *context)
777 {
778 flush_workqueue(kacpid_wq);
779 flush_workqueue(kacpi_notify_wq);
780 }
781
782 EXPORT_SYMBOL(acpi_os_wait_events_complete);
783
784 /*
785 * Allocate the memory for a spinlock and initialize it.
786 */
787 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
788 {
789 spin_lock_init(*handle);
790
791 return AE_OK;
792 }
793
794 /*
795 * Deallocate the memory for a spinlock.
796 */
797 void acpi_os_delete_lock(acpi_spinlock handle)
798 {
799 return;
800 }
801
802 acpi_status
803 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
804 {
805 struct semaphore *sem = NULL;
806
807 sem = acpi_os_allocate(sizeof(struct semaphore));
808 if (!sem)
809 return AE_NO_MEMORY;
810 memset(sem, 0, sizeof(struct semaphore));
811
812 sema_init(sem, initial_units);
813
814 *handle = (acpi_handle *) sem;
815
816 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
817 *handle, initial_units));
818
819 return AE_OK;
820 }
821
822 /*
823 * TODO: A better way to delete semaphores? Linux doesn't have a
824 * 'delete_semaphore()' function -- may result in an invalid
825 * pointer dereference for non-synchronized consumers. Should
826 * we at least check for blocked threads and signal/cancel them?
827 */
828
829 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
830 {
831 struct semaphore *sem = (struct semaphore *)handle;
832
833 if (!sem)
834 return AE_BAD_PARAMETER;
835
836 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
837
838 BUG_ON(!list_empty(&sem->wait_list));
839 kfree(sem);
840 sem = NULL;
841
842 return AE_OK;
843 }
844
845 /*
846 * TODO: Support for units > 1?
847 */
848 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
849 {
850 acpi_status status = AE_OK;
851 struct semaphore *sem = (struct semaphore *)handle;
852 long jiffies;
853 int ret = 0;
854
855 if (!sem || (units < 1))
856 return AE_BAD_PARAMETER;
857
858 if (units > 1)
859 return AE_SUPPORT;
860
861 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
862 handle, units, timeout));
863
864 if (timeout == ACPI_WAIT_FOREVER)
865 jiffies = MAX_SCHEDULE_TIMEOUT;
866 else
867 jiffies = msecs_to_jiffies(timeout);
868
869 ret = down_timeout(sem, jiffies);
870 if (ret)
871 status = AE_TIME;
872
873 if (ACPI_FAILURE(status)) {
874 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
875 "Failed to acquire semaphore[%p|%d|%d], %s",
876 handle, units, timeout,
877 acpi_format_exception(status)));
878 } else {
879 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
880 "Acquired semaphore[%p|%d|%d]", handle,
881 units, timeout));
882 }
883
884 return status;
885 }
886
887 /*
888 * TODO: Support for units > 1?
889 */
890 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
891 {
892 struct semaphore *sem = (struct semaphore *)handle;
893
894 if (!sem || (units < 1))
895 return AE_BAD_PARAMETER;
896
897 if (units > 1)
898 return AE_SUPPORT;
899
900 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
901 units));
902
903 up(sem);
904
905 return AE_OK;
906 }
907
908 #ifdef ACPI_FUTURE_USAGE
909 u32 acpi_os_get_line(char *buffer)
910 {
911
912 #ifdef ENABLE_DEBUGGER
913 if (acpi_in_debugger) {
914 u32 chars;
915
916 kdb_read(buffer, sizeof(line_buf));
917
918 /* remove the CR kdb includes */
919 chars = strlen(buffer) - 1;
920 buffer[chars] = '\0';
921 }
922 #endif
923
924 return 0;
925 }
926 #endif /* ACPI_FUTURE_USAGE */
927
928 acpi_status acpi_os_signal(u32 function, void *info)
929 {
930 switch (function) {
931 case ACPI_SIGNAL_FATAL:
932 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
933 break;
934 case ACPI_SIGNAL_BREAKPOINT:
935 /*
936 * AML Breakpoint
937 * ACPI spec. says to treat it as a NOP unless
938 * you are debugging. So if/when we integrate
939 * AML debugger into the kernel debugger its
940 * hook will go here. But until then it is
941 * not useful to print anything on breakpoints.
942 */
943 break;
944 default:
945 break;
946 }
947
948 return AE_OK;
949 }
950
951 static int __init acpi_os_name_setup(char *str)
952 {
953 char *p = acpi_os_name;
954 int count = ACPI_MAX_OVERRIDE_LEN - 1;
955
956 if (!str || !*str)
957 return 0;
958
959 for (; count-- && str && *str; str++) {
960 if (isalnum(*str) || *str == ' ' || *str == ':')
961 *p++ = *str;
962 else if (*str == '\'' || *str == '"')
963 continue;
964 else
965 break;
966 }
967 *p = 0;
968
969 return 1;
970
971 }
972
973 __setup("acpi_os_name=", acpi_os_name_setup);
974
975 static void __init set_osi_linux(unsigned int enable)
976 {
977 if (osi_linux.enable != enable) {
978 osi_linux.enable = enable;
979 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
980 enable ? "Add": "Delet");
981 }
982 return;
983 }
984
985 static void __init acpi_cmdline_osi_linux(unsigned int enable)
986 {
987 osi_linux.cmdline = 1; /* cmdline set the default */
988 set_osi_linux(enable);
989
990 return;
991 }
992
993 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
994 {
995 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
996
997 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
998
999 if (enable == -1)
1000 return;
1001
1002 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
1003
1004 set_osi_linux(enable);
1005
1006 return;
1007 }
1008
1009 /*
1010 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1011 *
1012 * empty string disables _OSI
1013 * string starting with '!' disables that string
1014 * otherwise string is added to list, augmenting built-in strings
1015 */
1016 int __init acpi_osi_setup(char *str)
1017 {
1018 if (str == NULL || *str == '\0') {
1019 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1020 acpi_gbl_create_osi_method = FALSE;
1021 } else if (!strcmp("!Linux", str)) {
1022 acpi_cmdline_osi_linux(0); /* !enable */
1023 } else if (*str == '!') {
1024 if (acpi_osi_invalidate(++str) == AE_OK)
1025 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1026 } else if (!strcmp("Linux", str)) {
1027 acpi_cmdline_osi_linux(1); /* enable */
1028 } else if (*osi_additional_string == '\0') {
1029 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1030 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1031 }
1032
1033 return 1;
1034 }
1035
1036 __setup("acpi_osi=", acpi_osi_setup);
1037
1038 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1039 static int __init acpi_serialize_setup(char *str)
1040 {
1041 printk(KERN_INFO PREFIX "serialize enabled\n");
1042
1043 acpi_gbl_all_methods_serialized = TRUE;
1044
1045 return 1;
1046 }
1047
1048 __setup("acpi_serialize", acpi_serialize_setup);
1049
1050 /* Check of resource interference between native drivers and ACPI
1051 * OperationRegions (SystemIO and System Memory only).
1052 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1053 * in arbitrary AML code and can interfere with legacy drivers.
1054 * acpi_enforce_resources= can be set to:
1055 *
1056 * - strict (default) (2)
1057 * -> further driver trying to access the resources will not load
1058 * - lax (1)
1059 * -> further driver trying to access the resources will load, but you
1060 * get a system message that something might go wrong...
1061 *
1062 * - no (0)
1063 * -> ACPI Operation Region resources will not be registered
1064 *
1065 */
1066 #define ENFORCE_RESOURCES_STRICT 2
1067 #define ENFORCE_RESOURCES_LAX 1
1068 #define ENFORCE_RESOURCES_NO 0
1069
1070 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1071
1072 static int __init acpi_enforce_resources_setup(char *str)
1073 {
1074 if (str == NULL || *str == '\0')
1075 return 0;
1076
1077 if (!strcmp("strict", str))
1078 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1079 else if (!strcmp("lax", str))
1080 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1081 else if (!strcmp("no", str))
1082 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1083
1084 return 1;
1085 }
1086
1087 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1088
1089 /* Check for resource conflicts between ACPI OperationRegions and native
1090 * drivers */
1091 int acpi_check_resource_conflict(const struct resource *res)
1092 {
1093 struct acpi_res_list *res_list_elem;
1094 int ioport;
1095 int clash = 0;
1096
1097 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1098 return 0;
1099 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1100 return 0;
1101
1102 ioport = res->flags & IORESOURCE_IO;
1103
1104 spin_lock(&acpi_res_lock);
1105 list_for_each_entry(res_list_elem, &resource_list_head,
1106 resource_list) {
1107 if (ioport && (res_list_elem->resource_type
1108 != ACPI_ADR_SPACE_SYSTEM_IO))
1109 continue;
1110 if (!ioport && (res_list_elem->resource_type
1111 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1112 continue;
1113
1114 if (res->end < res_list_elem->start
1115 || res_list_elem->end < res->start)
1116 continue;
1117 clash = 1;
1118 break;
1119 }
1120 spin_unlock(&acpi_res_lock);
1121
1122 if (clash) {
1123 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1124 printk(KERN_WARNING "ACPI: resource %s %pR"
1125 " conflicts with ACPI region %s %pR\n",
1126 res->name, res, res_list_elem->name,
1127 res_list_elem);
1128 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1129 printk(KERN_NOTICE "ACPI: This conflict may"
1130 " cause random problems and system"
1131 " instability\n");
1132 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1133 " for this device, you should use it instead of"
1134 " the native driver\n");
1135 }
1136 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1137 return -EBUSY;
1138 }
1139 return 0;
1140 }
1141 EXPORT_SYMBOL(acpi_check_resource_conflict);
1142
1143 int acpi_check_region(resource_size_t start, resource_size_t n,
1144 const char *name)
1145 {
1146 struct resource res = {
1147 .start = start,
1148 .end = start + n - 1,
1149 .name = name,
1150 .flags = IORESOURCE_IO,
1151 };
1152
1153 return acpi_check_resource_conflict(&res);
1154 }
1155 EXPORT_SYMBOL(acpi_check_region);
1156
1157 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1158 const char *name)
1159 {
1160 struct resource res = {
1161 .start = start,
1162 .end = start + n - 1,
1163 .name = name,
1164 .flags = IORESOURCE_MEM,
1165 };
1166
1167 return acpi_check_resource_conflict(&res);
1168
1169 }
1170 EXPORT_SYMBOL(acpi_check_mem_region);
1171
1172 /*
1173 * Let drivers know whether the resource checks are effective
1174 */
1175 int acpi_resources_are_enforced(void)
1176 {
1177 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1178 }
1179 EXPORT_SYMBOL(acpi_resources_are_enforced);
1180
1181 /*
1182 * Acquire a spinlock.
1183 *
1184 * handle is a pointer to the spinlock_t.
1185 */
1186
1187 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1188 {
1189 acpi_cpu_flags flags;
1190 spin_lock_irqsave(lockp, flags);
1191 return flags;
1192 }
1193
1194 /*
1195 * Release a spinlock. See above.
1196 */
1197
1198 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1199 {
1200 spin_unlock_irqrestore(lockp, flags);
1201 }
1202
1203 #ifndef ACPI_USE_LOCAL_CACHE
1204
1205 /*******************************************************************************
1206 *
1207 * FUNCTION: acpi_os_create_cache
1208 *
1209 * PARAMETERS: name - Ascii name for the cache
1210 * size - Size of each cached object
1211 * depth - Maximum depth of the cache (in objects) <ignored>
1212 * cache - Where the new cache object is returned
1213 *
1214 * RETURN: status
1215 *
1216 * DESCRIPTION: Create a cache object
1217 *
1218 ******************************************************************************/
1219
1220 acpi_status
1221 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1222 {
1223 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1224 if (*cache == NULL)
1225 return AE_ERROR;
1226 else
1227 return AE_OK;
1228 }
1229
1230 /*******************************************************************************
1231 *
1232 * FUNCTION: acpi_os_purge_cache
1233 *
1234 * PARAMETERS: Cache - Handle to cache object
1235 *
1236 * RETURN: Status
1237 *
1238 * DESCRIPTION: Free all objects within the requested cache.
1239 *
1240 ******************************************************************************/
1241
1242 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1243 {
1244 kmem_cache_shrink(cache);
1245 return (AE_OK);
1246 }
1247
1248 /*******************************************************************************
1249 *
1250 * FUNCTION: acpi_os_delete_cache
1251 *
1252 * PARAMETERS: Cache - Handle to cache object
1253 *
1254 * RETURN: Status
1255 *
1256 * DESCRIPTION: Free all objects within the requested cache and delete the
1257 * cache object.
1258 *
1259 ******************************************************************************/
1260
1261 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1262 {
1263 kmem_cache_destroy(cache);
1264 return (AE_OK);
1265 }
1266
1267 /*******************************************************************************
1268 *
1269 * FUNCTION: acpi_os_release_object
1270 *
1271 * PARAMETERS: Cache - Handle to cache object
1272 * Object - The object to be released
1273 *
1274 * RETURN: None
1275 *
1276 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1277 * the object is deleted.
1278 *
1279 ******************************************************************************/
1280
1281 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1282 {
1283 kmem_cache_free(cache, object);
1284 return (AE_OK);
1285 }
1286
1287 /******************************************************************************
1288 *
1289 * FUNCTION: acpi_os_validate_interface
1290 *
1291 * PARAMETERS: interface - Requested interface to be validated
1292 *
1293 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise
1294 *
1295 * DESCRIPTION: Match an interface string to the interfaces supported by the
1296 * host. Strings originate from an AML call to the _OSI method.
1297 *
1298 *****************************************************************************/
1299
1300 acpi_status
1301 acpi_os_validate_interface (char *interface)
1302 {
1303 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1304 return AE_OK;
1305 if (!strcmp("Linux", interface)) {
1306
1307 printk(KERN_NOTICE PREFIX
1308 "BIOS _OSI(Linux) query %s%s\n",
1309 osi_linux.enable ? "honored" : "ignored",
1310 osi_linux.cmdline ? " via cmdline" :
1311 osi_linux.dmi ? " via DMI" : "");
1312
1313 if (osi_linux.enable)
1314 return AE_OK;
1315 }
1316 return AE_SUPPORT;
1317 }
1318
1319 static inline int acpi_res_list_add(struct acpi_res_list *res)
1320 {
1321 struct acpi_res_list *res_list_elem;
1322
1323 list_for_each_entry(res_list_elem, &resource_list_head,
1324 resource_list) {
1325
1326 if (res->resource_type == res_list_elem->resource_type &&
1327 res->start == res_list_elem->start &&
1328 res->end == res_list_elem->end) {
1329
1330 /*
1331 * The Region(addr,len) already exist in the list,
1332 * just increase the count
1333 */
1334
1335 res_list_elem->count++;
1336 return 0;
1337 }
1338 }
1339
1340 res->count = 1;
1341 list_add(&res->resource_list, &resource_list_head);
1342 return 1;
1343 }
1344
1345 static inline void acpi_res_list_del(struct acpi_res_list *res)
1346 {
1347 struct acpi_res_list *res_list_elem;
1348
1349 list_for_each_entry(res_list_elem, &resource_list_head,
1350 resource_list) {
1351
1352 if (res->resource_type == res_list_elem->resource_type &&
1353 res->start == res_list_elem->start &&
1354 res->end == res_list_elem->end) {
1355
1356 /*
1357 * If the res count is decreased to 0,
1358 * remove and free it
1359 */
1360
1361 if (--res_list_elem->count == 0) {
1362 list_del(&res_list_elem->resource_list);
1363 kfree(res_list_elem);
1364 }
1365 return;
1366 }
1367 }
1368 }
1369
1370 acpi_status
1371 acpi_os_invalidate_address(
1372 u8 space_id,
1373 acpi_physical_address address,
1374 acpi_size length)
1375 {
1376 struct acpi_res_list res;
1377
1378 switch (space_id) {
1379 case ACPI_ADR_SPACE_SYSTEM_IO:
1380 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1381 /* Only interference checks against SystemIO and SystemMemory
1382 are needed */
1383 res.start = address;
1384 res.end = address + length - 1;
1385 res.resource_type = space_id;
1386 spin_lock(&acpi_res_lock);
1387 acpi_res_list_del(&res);
1388 spin_unlock(&acpi_res_lock);
1389 break;
1390 case ACPI_ADR_SPACE_PCI_CONFIG:
1391 case ACPI_ADR_SPACE_EC:
1392 case ACPI_ADR_SPACE_SMBUS:
1393 case ACPI_ADR_SPACE_CMOS:
1394 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1395 case ACPI_ADR_SPACE_DATA_TABLE:
1396 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1397 break;
1398 }
1399 return AE_OK;
1400 }
1401
1402 /******************************************************************************
1403 *
1404 * FUNCTION: acpi_os_validate_address
1405 *
1406 * PARAMETERS: space_id - ACPI space ID
1407 * address - Physical address
1408 * length - Address length
1409 *
1410 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1411 * should return AE_AML_ILLEGAL_ADDRESS.
1412 *
1413 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1414 * the addresses accessed by AML operation regions.
1415 *
1416 *****************************************************************************/
1417
1418 acpi_status
1419 acpi_os_validate_address (
1420 u8 space_id,
1421 acpi_physical_address address,
1422 acpi_size length,
1423 char *name)
1424 {
1425 struct acpi_res_list *res;
1426 int added;
1427 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1428 return AE_OK;
1429
1430 switch (space_id) {
1431 case ACPI_ADR_SPACE_SYSTEM_IO:
1432 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1433 /* Only interference checks against SystemIO and SystemMemory
1434 are needed */
1435 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1436 if (!res)
1437 return AE_OK;
1438 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1439 strlcpy(res->name, name, 5);
1440 res->start = address;
1441 res->end = address + length - 1;
1442 res->resource_type = space_id;
1443 spin_lock(&acpi_res_lock);
1444 added = acpi_res_list_add(res);
1445 spin_unlock(&acpi_res_lock);
1446 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1447 "name: %s\n", added ? "Added" : "Already exist",
1448 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1449 ? "SystemIO" : "System Memory",
1450 (unsigned long long)res->start,
1451 (unsigned long long)res->end,
1452 res->name);
1453 if (!added)
1454 kfree(res);
1455 break;
1456 case ACPI_ADR_SPACE_PCI_CONFIG:
1457 case ACPI_ADR_SPACE_EC:
1458 case ACPI_ADR_SPACE_SMBUS:
1459 case ACPI_ADR_SPACE_CMOS:
1460 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1461 case ACPI_ADR_SPACE_DATA_TABLE:
1462 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1463 break;
1464 }
1465 return AE_OK;
1466 }
1467
1468 #endif
Linux kernel - Deliverables
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