Add down_timeout and change ACPI to use it
[linux-2.6.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/dmi.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
47
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
54
55 #define _COMPONENT              ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX          "ACPI: "
58 struct acpi_os_dpc {
59         acpi_osd_exec_callback function;
60         void *context;
61         struct work_struct work;
62 };
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
84 struct acpi_res_list {
85         resource_size_t start;
86         resource_size_t end;
87         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
88         char name[5];   /* only can have a length of 4 chars, make use of this
89                            one instead of res->name, no need to kalloc then */
90         struct list_head resource_list;
91 };
92
93 static LIST_HEAD(resource_list_head);
94 static DEFINE_SPINLOCK(acpi_res_lock);
95
96 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
97 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
98
99 /*
100  * "Ode to _OSI(Linux)"
101  *
102  * osi_linux -- Control response to BIOS _OSI(Linux) query.
103  *
104  * As Linux evolves, the features that it supports change.
105  * So an OSI string such as "Linux" is not specific enough
106  * to be useful across multiple versions of Linux.  It
107  * doesn't identify any particular feature, interface,
108  * or even any particular version of Linux...
109  *
110  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
111  * to a BIOS _OSI(Linux) query.  When
112  * a reference mobile BIOS started using it, its use
113  * started to spread to many vendor platforms.
114  * As it is not supportable, we need to halt that spread.
115  *
116  * Today, most BIOS references to _OSI(Linux) are noise --
117  * they have no functional effect and are just dead code
118  * carried over from the reference BIOS.
119  *
120  * The next most common case is that _OSI(Linux) harms Linux,
121  * usually by causing the BIOS to follow paths that are
122  * not tested during Windows validation.
123  *
124  * Finally, there is a short list of platforms
125  * where OSI(Linux) benefits Linux.
126  *
127  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
128  * DMI is used to disable the dmesg warning about OSI(Linux)
129  * on platforms where it is known to have no effect.
130  * But a dmesg warning remains for systems where
131  * we do not know if OSI(Linux) is good or bad for the system.
132  * DMI is also used to enable OSI(Linux) for the machines
133  * that are known to need it.
134  *
135  * BIOS writers should NOT query _OSI(Linux) on future systems.
136  * It will be ignored by default, and to get Linux to
137  * not ignore it will require a kernel source update to
138  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
139  */
140 #define OSI_LINUX_ENABLE 0
141
142 static struct osi_linux {
143         unsigned int    enable:1;
144         unsigned int    dmi:1;
145         unsigned int    cmdline:1;
146         unsigned int    known:1;
147 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
148
149 static void __init acpi_request_region (struct acpi_generic_address *addr,
150         unsigned int length, char *desc)
151 {
152         struct resource *res;
153
154         if (!addr->address || !length)
155                 return;
156
157         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
158                 res = request_region(addr->address, length, desc);
159         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
160                 res = request_mem_region(addr->address, length, desc);
161 }
162
163 static int __init acpi_reserve_resources(void)
164 {
165         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
166                 "ACPI PM1a_EVT_BLK");
167
168         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
169                 "ACPI PM1b_EVT_BLK");
170
171         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
172                 "ACPI PM1a_CNT_BLK");
173
174         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
175                 "ACPI PM1b_CNT_BLK");
176
177         if (acpi_gbl_FADT.pm_timer_length == 4)
178                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
179
180         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
181                 "ACPI PM2_CNT_BLK");
182
183         /* Length of GPE blocks must be a non-negative multiple of 2 */
184
185         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
186                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
187                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
188
189         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
190                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
191                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
192
193         return 0;
194 }
195 device_initcall(acpi_reserve_resources);
196
197 acpi_status __init acpi_os_initialize(void)
198 {
199         return AE_OK;
200 }
201
202 acpi_status acpi_os_initialize1(void)
203 {
204         kacpid_wq = create_singlethread_workqueue("kacpid");
205         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
206         BUG_ON(!kacpid_wq);
207         BUG_ON(!kacpi_notify_wq);
208         return AE_OK;
209 }
210
211 acpi_status acpi_os_terminate(void)
212 {
213         if (acpi_irq_handler) {
214                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
215                                                  acpi_irq_handler);
216         }
217
218         destroy_workqueue(kacpid_wq);
219         destroy_workqueue(kacpi_notify_wq);
220
221         return AE_OK;
222 }
223
224 void acpi_os_printf(const char *fmt, ...)
225 {
226         va_list args;
227         va_start(args, fmt);
228         acpi_os_vprintf(fmt, args);
229         va_end(args);
230 }
231
232 void acpi_os_vprintf(const char *fmt, va_list args)
233 {
234         static char buffer[512];
235
236         vsprintf(buffer, fmt, args);
237
238 #ifdef ENABLE_DEBUGGER
239         if (acpi_in_debugger) {
240                 kdb_printf("%s", buffer);
241         } else {
242                 printk("%s", buffer);
243         }
244 #else
245         printk("%s", buffer);
246 #endif
247 }
248
249 acpi_physical_address __init acpi_os_get_root_pointer(void)
250 {
251         if (efi_enabled) {
252                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
253                         return efi.acpi20;
254                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
255                         return efi.acpi;
256                 else {
257                         printk(KERN_ERR PREFIX
258                                "System description tables not found\n");
259                         return 0;
260                 }
261         } else {
262                 acpi_physical_address pa = 0;
263
264                 acpi_find_root_pointer(&pa);
265                 return pa;
266         }
267 }
268
269 void __iomem *__init_refok
270 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
271 {
272         if (phys > ULONG_MAX) {
273                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
274                 return NULL;
275         }
276         if (acpi_gbl_permanent_mmap)
277                 /*
278                 * ioremap checks to ensure this is in reserved space
279                 */
280                 return ioremap((unsigned long)phys, size);
281         else
282                 return __acpi_map_table((unsigned long)phys, size);
283 }
284 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
285
286 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
287 {
288         if (acpi_gbl_permanent_mmap) {
289                 iounmap(virt);
290         }
291 }
292 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
293
294 #ifdef ACPI_FUTURE_USAGE
295 acpi_status
296 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
297 {
298         if (!phys || !virt)
299                 return AE_BAD_PARAMETER;
300
301         *phys = virt_to_phys(virt);
302
303         return AE_OK;
304 }
305 #endif
306
307 #define ACPI_MAX_OVERRIDE_LEN 100
308
309 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
310
311 acpi_status
312 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
313                             acpi_string * new_val)
314 {
315         if (!init_val || !new_val)
316                 return AE_BAD_PARAMETER;
317
318         *new_val = NULL;
319         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
320                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
321                        acpi_os_name);
322                 *new_val = acpi_os_name;
323         }
324
325         return AE_OK;
326 }
327
328 acpi_status
329 acpi_os_table_override(struct acpi_table_header * existing_table,
330                        struct acpi_table_header ** new_table)
331 {
332         if (!existing_table || !new_table)
333                 return AE_BAD_PARAMETER;
334
335         *new_table = NULL;
336
337 #ifdef CONFIG_ACPI_CUSTOM_DSDT
338         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
339                 *new_table = (struct acpi_table_header *)AmlCode;
340 #endif
341         if (*new_table != NULL) {
342                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
343                            "this is unsafe: tainting kernel\n",
344                        existing_table->signature,
345                        existing_table->oem_table_id);
346                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
347         }
348         return AE_OK;
349 }
350
351 static irqreturn_t acpi_irq(int irq, void *dev_id)
352 {
353         u32 handled;
354
355         handled = (*acpi_irq_handler) (acpi_irq_context);
356
357         if (handled) {
358                 acpi_irq_handled++;
359                 return IRQ_HANDLED;
360         } else
361                 return IRQ_NONE;
362 }
363
364 acpi_status
365 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
366                                   void *context)
367 {
368         unsigned int irq;
369
370         acpi_irq_stats_init();
371
372         /*
373          * Ignore the GSI from the core, and use the value in our copy of the
374          * FADT. It may not be the same if an interrupt source override exists
375          * for the SCI.
376          */
377         gsi = acpi_gbl_FADT.sci_interrupt;
378         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
379                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
380                        gsi);
381                 return AE_OK;
382         }
383
384         acpi_irq_handler = handler;
385         acpi_irq_context = context;
386         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
387                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
388                 return AE_NOT_ACQUIRED;
389         }
390         acpi_irq_irq = irq;
391
392         return AE_OK;
393 }
394
395 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
396 {
397         if (irq) {
398                 free_irq(irq, acpi_irq);
399                 acpi_irq_handler = NULL;
400                 acpi_irq_irq = 0;
401         }
402
403         return AE_OK;
404 }
405
406 /*
407  * Running in interpreter thread context, safe to sleep
408  */
409
410 void acpi_os_sleep(acpi_integer ms)
411 {
412         schedule_timeout_interruptible(msecs_to_jiffies(ms));
413 }
414
415 void acpi_os_stall(u32 us)
416 {
417         while (us) {
418                 u32 delay = 1000;
419
420                 if (delay > us)
421                         delay = us;
422                 udelay(delay);
423                 touch_nmi_watchdog();
424                 us -= delay;
425         }
426 }
427
428 /*
429  * Support ACPI 3.0 AML Timer operand
430  * Returns 64-bit free-running, monotonically increasing timer
431  * with 100ns granularity
432  */
433 u64 acpi_os_get_timer(void)
434 {
435         static u64 t;
436
437 #ifdef  CONFIG_HPET
438         /* TBD: use HPET if available */
439 #endif
440
441 #ifdef  CONFIG_X86_PM_TIMER
442         /* TBD: default to PM timer if HPET was not available */
443 #endif
444         if (!t)
445                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
446
447         return ++t;
448 }
449
450 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
451 {
452         u32 dummy;
453
454         if (!value)
455                 value = &dummy;
456
457         *value = 0;
458         if (width <= 8) {
459                 *(u8 *) value = inb(port);
460         } else if (width <= 16) {
461                 *(u16 *) value = inw(port);
462         } else if (width <= 32) {
463                 *(u32 *) value = inl(port);
464         } else {
465                 BUG();
466         }
467
468         return AE_OK;
469 }
470
471 EXPORT_SYMBOL(acpi_os_read_port);
472
473 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
474 {
475         if (width <= 8) {
476                 outb(value, port);
477         } else if (width <= 16) {
478                 outw(value, port);
479         } else if (width <= 32) {
480                 outl(value, port);
481         } else {
482                 BUG();
483         }
484
485         return AE_OK;
486 }
487
488 EXPORT_SYMBOL(acpi_os_write_port);
489
490 acpi_status
491 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
492 {
493         u32 dummy;
494         void __iomem *virt_addr;
495
496         virt_addr = ioremap(phys_addr, width);
497         if (!value)
498                 value = &dummy;
499
500         switch (width) {
501         case 8:
502                 *(u8 *) value = readb(virt_addr);
503                 break;
504         case 16:
505                 *(u16 *) value = readw(virt_addr);
506                 break;
507         case 32:
508                 *(u32 *) value = readl(virt_addr);
509                 break;
510         default:
511                 BUG();
512         }
513
514         iounmap(virt_addr);
515
516         return AE_OK;
517 }
518
519 acpi_status
520 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
521 {
522         void __iomem *virt_addr;
523
524         virt_addr = ioremap(phys_addr, width);
525
526         switch (width) {
527         case 8:
528                 writeb(value, virt_addr);
529                 break;
530         case 16:
531                 writew(value, virt_addr);
532                 break;
533         case 32:
534                 writel(value, virt_addr);
535                 break;
536         default:
537                 BUG();
538         }
539
540         iounmap(virt_addr);
541
542         return AE_OK;
543 }
544
545 acpi_status
546 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
547                                u32 *value, u32 width)
548 {
549         int result, size;
550
551         if (!value)
552                 return AE_BAD_PARAMETER;
553
554         switch (width) {
555         case 8:
556                 size = 1;
557                 break;
558         case 16:
559                 size = 2;
560                 break;
561         case 32:
562                 size = 4;
563                 break;
564         default:
565                 return AE_ERROR;
566         }
567
568         result = raw_pci_read(pci_id->segment, pci_id->bus,
569                                 PCI_DEVFN(pci_id->device, pci_id->function),
570                                 reg, size, value);
571
572         return (result ? AE_ERROR : AE_OK);
573 }
574
575 acpi_status
576 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
577                                 acpi_integer value, u32 width)
578 {
579         int result, size;
580
581         switch (width) {
582         case 8:
583                 size = 1;
584                 break;
585         case 16:
586                 size = 2;
587                 break;
588         case 32:
589                 size = 4;
590                 break;
591         default:
592                 return AE_ERROR;
593         }
594
595         result = raw_pci_write(pci_id->segment, pci_id->bus,
596                                 PCI_DEVFN(pci_id->device, pci_id->function),
597                                 reg, size, value);
598
599         return (result ? AE_ERROR : AE_OK);
600 }
601
602 /* TODO: Change code to take advantage of driver model more */
603 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
604                                     acpi_handle chandle,        /* current node */
605                                     struct acpi_pci_id **id,
606                                     int *is_bridge, u8 * bus_number)
607 {
608         acpi_handle handle;
609         struct acpi_pci_id *pci_id = *id;
610         acpi_status status;
611         unsigned long temp;
612         acpi_object_type type;
613
614         acpi_get_parent(chandle, &handle);
615         if (handle != rhandle) {
616                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
617                                         bus_number);
618
619                 status = acpi_get_type(handle, &type);
620                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
621                         return;
622
623                 status =
624                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
625                                           &temp);
626                 if (ACPI_SUCCESS(status)) {
627                         u32 val;
628                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
629                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
630
631                         if (*is_bridge)
632                                 pci_id->bus = *bus_number;
633
634                         /* any nicer way to get bus number of bridge ? */
635                         status =
636                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
637                                                            8);
638                         if (ACPI_SUCCESS(status)
639                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
640                                 status =
641                                     acpi_os_read_pci_configuration(pci_id, 0x18,
642                                                                    &val, 8);
643                                 if (!ACPI_SUCCESS(status)) {
644                                         /* Certainly broken...  FIX ME */
645                                         return;
646                                 }
647                                 *is_bridge = 1;
648                                 pci_id->bus = val;
649                                 status =
650                                     acpi_os_read_pci_configuration(pci_id, 0x19,
651                                                                    &val, 8);
652                                 if (ACPI_SUCCESS(status)) {
653                                         *bus_number = val;
654                                 }
655                         } else
656                                 *is_bridge = 0;
657                 }
658         }
659 }
660
661 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
662                            acpi_handle chandle, /* current node */
663                            struct acpi_pci_id **id)
664 {
665         int is_bridge = 1;
666         u8 bus_number = (*id)->bus;
667
668         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
669 }
670
671 static void acpi_os_execute_deferred(struct work_struct *work)
672 {
673         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
674         if (!dpc) {
675                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
676                 return;
677         }
678
679         dpc->function(dpc->context);
680         kfree(dpc);
681
682         return;
683 }
684
685 /*******************************************************************************
686  *
687  * FUNCTION:    acpi_os_execute
688  *
689  * PARAMETERS:  Type               - Type of the callback
690  *              Function           - Function to be executed
691  *              Context            - Function parameters
692  *
693  * RETURN:      Status
694  *
695  * DESCRIPTION: Depending on type, either queues function for deferred execution or
696  *              immediately executes function on a separate thread.
697  *
698  ******************************************************************************/
699
700 acpi_status acpi_os_execute(acpi_execute_type type,
701                             acpi_osd_exec_callback function, void *context)
702 {
703         acpi_status status = AE_OK;
704         struct acpi_os_dpc *dpc;
705         struct workqueue_struct *queue;
706         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
707                           "Scheduling function [%p(%p)] for deferred execution.\n",
708                           function, context));
709
710         if (!function)
711                 return AE_BAD_PARAMETER;
712
713         /*
714          * Allocate/initialize DPC structure.  Note that this memory will be
715          * freed by the callee.  The kernel handles the work_struct list  in a
716          * way that allows us to also free its memory inside the callee.
717          * Because we may want to schedule several tasks with different
718          * parameters we can't use the approach some kernel code uses of
719          * having a static work_struct.
720          */
721
722         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
723         if (!dpc)
724                 return_ACPI_STATUS(AE_NO_MEMORY);
725
726         dpc->function = function;
727         dpc->context = context;
728
729         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
730         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
731         if (!queue_work(queue, &dpc->work)) {
732                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
733                           "Call to queue_work() failed.\n"));
734                 status = AE_ERROR;
735                 kfree(dpc);
736         }
737         return_ACPI_STATUS(status);
738 }
739
740 EXPORT_SYMBOL(acpi_os_execute);
741
742 void acpi_os_wait_events_complete(void *context)
743 {
744         flush_workqueue(kacpid_wq);
745 }
746
747 EXPORT_SYMBOL(acpi_os_wait_events_complete);
748
749 /*
750  * Allocate the memory for a spinlock and initialize it.
751  */
752 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
753 {
754         spin_lock_init(*handle);
755
756         return AE_OK;
757 }
758
759 /*
760  * Deallocate the memory for a spinlock.
761  */
762 void acpi_os_delete_lock(acpi_spinlock handle)
763 {
764         return;
765 }
766
767 acpi_status
768 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
769 {
770         struct semaphore *sem = NULL;
771
772         sem = acpi_os_allocate(sizeof(struct semaphore));
773         if (!sem)
774                 return AE_NO_MEMORY;
775         memset(sem, 0, sizeof(struct semaphore));
776
777         sema_init(sem, initial_units);
778
779         *handle = (acpi_handle *) sem;
780
781         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
782                           *handle, initial_units));
783
784         return AE_OK;
785 }
786
787 /*
788  * TODO: A better way to delete semaphores?  Linux doesn't have a
789  * 'delete_semaphore()' function -- may result in an invalid
790  * pointer dereference for non-synchronized consumers.  Should
791  * we at least check for blocked threads and signal/cancel them?
792  */
793
794 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
795 {
796         struct semaphore *sem = (struct semaphore *)handle;
797
798         if (!sem)
799                 return AE_BAD_PARAMETER;
800
801         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
802
803         BUG_ON(!list_empty(&sem->wait_list));
804         kfree(sem);
805         sem = NULL;
806
807         return AE_OK;
808 }
809
810 /*
811  * TODO: Support for units > 1?
812  */
813 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
814 {
815         acpi_status status = AE_OK;
816         struct semaphore *sem = (struct semaphore *)handle;
817         long jiffies;
818         int ret = 0;
819
820         if (!sem || (units < 1))
821                 return AE_BAD_PARAMETER;
822
823         if (units > 1)
824                 return AE_SUPPORT;
825
826         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
827                           handle, units, timeout));
828
829         if (timeout == ACPI_WAIT_FOREVER)
830                 jiffies = MAX_SCHEDULE_TIMEOUT;
831         else
832                 jiffies = msecs_to_jiffies(timeout);
833         
834         ret = down_timeout(sem, jiffies);
835         if (ret)
836                 status = AE_TIME;
837
838         if (ACPI_FAILURE(status)) {
839                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
840                                   "Failed to acquire semaphore[%p|%d|%d], %s",
841                                   handle, units, timeout,
842                                   acpi_format_exception(status)));
843         } else {
844                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
845                                   "Acquired semaphore[%p|%d|%d]", handle,
846                                   units, timeout));
847         }
848
849         return status;
850 }
851
852 /*
853  * TODO: Support for units > 1?
854  */
855 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
856 {
857         struct semaphore *sem = (struct semaphore *)handle;
858
859         if (!sem || (units < 1))
860                 return AE_BAD_PARAMETER;
861
862         if (units > 1)
863                 return AE_SUPPORT;
864
865         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
866                           units));
867
868         up(sem);
869
870         return AE_OK;
871 }
872
873 #ifdef ACPI_FUTURE_USAGE
874 u32 acpi_os_get_line(char *buffer)
875 {
876
877 #ifdef ENABLE_DEBUGGER
878         if (acpi_in_debugger) {
879                 u32 chars;
880
881                 kdb_read(buffer, sizeof(line_buf));
882
883                 /* remove the CR kdb includes */
884                 chars = strlen(buffer) - 1;
885                 buffer[chars] = '\0';
886         }
887 #endif
888
889         return 0;
890 }
891 #endif                          /*  ACPI_FUTURE_USAGE  */
892
893 acpi_status acpi_os_signal(u32 function, void *info)
894 {
895         switch (function) {
896         case ACPI_SIGNAL_FATAL:
897                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
898                 break;
899         case ACPI_SIGNAL_BREAKPOINT:
900                 /*
901                  * AML Breakpoint
902                  * ACPI spec. says to treat it as a NOP unless
903                  * you are debugging.  So if/when we integrate
904                  * AML debugger into the kernel debugger its
905                  * hook will go here.  But until then it is
906                  * not useful to print anything on breakpoints.
907                  */
908                 break;
909         default:
910                 break;
911         }
912
913         return AE_OK;
914 }
915
916 static int __init acpi_os_name_setup(char *str)
917 {
918         char *p = acpi_os_name;
919         int count = ACPI_MAX_OVERRIDE_LEN - 1;
920
921         if (!str || !*str)
922                 return 0;
923
924         for (; count-- && str && *str; str++) {
925                 if (isalnum(*str) || *str == ' ' || *str == ':')
926                         *p++ = *str;
927                 else if (*str == '\'' || *str == '"')
928                         continue;
929                 else
930                         break;
931         }
932         *p = 0;
933
934         return 1;
935
936 }
937
938 __setup("acpi_os_name=", acpi_os_name_setup);
939
940 static void __init set_osi_linux(unsigned int enable)
941 {
942         if (osi_linux.enable != enable) {
943                 osi_linux.enable = enable;
944                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
945                         enable ? "Add": "Delet");
946         }
947         return;
948 }
949
950 static void __init acpi_cmdline_osi_linux(unsigned int enable)
951 {
952         osi_linux.cmdline = 1;  /* cmdline set the default */
953         set_osi_linux(enable);
954
955         return;
956 }
957
958 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
959 {
960         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
961
962         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
963
964         if (enable == -1)
965                 return;
966
967         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
968
969         set_osi_linux(enable);
970
971         return;
972 }
973
974 /*
975  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
976  *
977  * empty string disables _OSI
978  * string starting with '!' disables that string
979  * otherwise string is added to list, augmenting built-in strings
980  */
981 int __init acpi_osi_setup(char *str)
982 {
983         if (str == NULL || *str == '\0') {
984                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
985                 acpi_gbl_create_osi_method = FALSE;
986         } else if (!strcmp("!Linux", str)) {
987                 acpi_cmdline_osi_linux(0);      /* !enable */
988         } else if (*str == '!') {
989                 if (acpi_osi_invalidate(++str) == AE_OK)
990                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
991         } else if (!strcmp("Linux", str)) {
992                 acpi_cmdline_osi_linux(1);      /* enable */
993         } else if (*osi_additional_string == '\0') {
994                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
995                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
996         }
997
998         return 1;
999 }
1000
1001 __setup("acpi_osi=", acpi_osi_setup);
1002
1003 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1004 static int __init acpi_serialize_setup(char *str)
1005 {
1006         printk(KERN_INFO PREFIX "serialize enabled\n");
1007
1008         acpi_gbl_all_methods_serialized = TRUE;
1009
1010         return 1;
1011 }
1012
1013 __setup("acpi_serialize", acpi_serialize_setup);
1014
1015 /*
1016  * Wake and Run-Time GPES are expected to be separate.
1017  * We disable wake-GPEs at run-time to prevent spurious
1018  * interrupts.
1019  *
1020  * However, if a system exists that shares Wake and
1021  * Run-time events on the same GPE this flag is available
1022  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1023  */
1024 static int __init acpi_wake_gpes_always_on_setup(char *str)
1025 {
1026         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1027
1028         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1029
1030         return 1;
1031 }
1032
1033 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1034
1035 /* Check of resource interference between native drivers and ACPI
1036  * OperationRegions (SystemIO and System Memory only).
1037  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1038  * in arbitrary AML code and can interfere with legacy drivers.
1039  * acpi_enforce_resources= can be set to:
1040  *
1041  *   - strict           (2)
1042  *     -> further driver trying to access the resources will not load
1043  *   - lax (default)    (1)
1044  *     -> further driver trying to access the resources will load, but you
1045  *     get a system message that something might go wrong...
1046  *
1047  *   - no               (0)
1048  *     -> ACPI Operation Region resources will not be registered
1049  *
1050  */
1051 #define ENFORCE_RESOURCES_STRICT 2
1052 #define ENFORCE_RESOURCES_LAX    1
1053 #define ENFORCE_RESOURCES_NO     0
1054
1055 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1056
1057 static int __init acpi_enforce_resources_setup(char *str)
1058 {
1059         if (str == NULL || *str == '\0')
1060                 return 0;
1061
1062         if (!strcmp("strict", str))
1063                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1064         else if (!strcmp("lax", str))
1065                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1066         else if (!strcmp("no", str))
1067                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1068
1069         return 1;
1070 }
1071
1072 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1073
1074 /* Check for resource conflicts between ACPI OperationRegions and native
1075  * drivers */
1076 int acpi_check_resource_conflict(struct resource *res)
1077 {
1078         struct acpi_res_list *res_list_elem;
1079         int ioport;
1080         int clash = 0;
1081
1082         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1083                 return 0;
1084         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1085                 return 0;
1086
1087         ioport = res->flags & IORESOURCE_IO;
1088
1089         spin_lock(&acpi_res_lock);
1090         list_for_each_entry(res_list_elem, &resource_list_head,
1091                             resource_list) {
1092                 if (ioport && (res_list_elem->resource_type
1093                                != ACPI_ADR_SPACE_SYSTEM_IO))
1094                         continue;
1095                 if (!ioport && (res_list_elem->resource_type
1096                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1097                         continue;
1098
1099                 if (res->end < res_list_elem->start
1100                     || res_list_elem->end < res->start)
1101                         continue;
1102                 clash = 1;
1103                 break;
1104         }
1105         spin_unlock(&acpi_res_lock);
1106
1107         if (clash) {
1108                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1109                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1110                                " conflicts with ACPI region %s"
1111                                " [0x%llx-0x%llx]\n",
1112                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1113                                ? KERN_WARNING : KERN_ERR,
1114                                ioport ? "I/O" : "Memory", res->name,
1115                                (long long) res->start, (long long) res->end,
1116                                res_list_elem->name,
1117                                (long long) res_list_elem->start,
1118                                (long long) res_list_elem->end);
1119                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1120                 }
1121                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1122                         return -EBUSY;
1123         }
1124         return 0;
1125 }
1126 EXPORT_SYMBOL(acpi_check_resource_conflict);
1127
1128 int acpi_check_region(resource_size_t start, resource_size_t n,
1129                       const char *name)
1130 {
1131         struct resource res = {
1132                 .start = start,
1133                 .end   = start + n - 1,
1134                 .name  = name,
1135                 .flags = IORESOURCE_IO,
1136         };
1137
1138         return acpi_check_resource_conflict(&res);
1139 }
1140 EXPORT_SYMBOL(acpi_check_region);
1141
1142 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1143                       const char *name)
1144 {
1145         struct resource res = {
1146                 .start = start,
1147                 .end   = start + n - 1,
1148                 .name  = name,
1149                 .flags = IORESOURCE_MEM,
1150         };
1151
1152         return acpi_check_resource_conflict(&res);
1153
1154 }
1155 EXPORT_SYMBOL(acpi_check_mem_region);
1156
1157 /*
1158  * Acquire a spinlock.
1159  *
1160  * handle is a pointer to the spinlock_t.
1161  */
1162
1163 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1164 {
1165         acpi_cpu_flags flags;
1166         spin_lock_irqsave(lockp, flags);
1167         return flags;
1168 }
1169
1170 /*
1171  * Release a spinlock. See above.
1172  */
1173
1174 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1175 {
1176         spin_unlock_irqrestore(lockp, flags);
1177 }
1178
1179 #ifndef ACPI_USE_LOCAL_CACHE
1180
1181 /*******************************************************************************
1182  *
1183  * FUNCTION:    acpi_os_create_cache
1184  *
1185  * PARAMETERS:  name      - Ascii name for the cache
1186  *              size      - Size of each cached object
1187  *              depth     - Maximum depth of the cache (in objects) <ignored>
1188  *              cache     - Where the new cache object is returned
1189  *
1190  * RETURN:      status
1191  *
1192  * DESCRIPTION: Create a cache object
1193  *
1194  ******************************************************************************/
1195
1196 acpi_status
1197 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1198 {
1199         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1200         if (*cache == NULL)
1201                 return AE_ERROR;
1202         else
1203                 return AE_OK;
1204 }
1205
1206 /*******************************************************************************
1207  *
1208  * FUNCTION:    acpi_os_purge_cache
1209  *
1210  * PARAMETERS:  Cache           - Handle to cache object
1211  *
1212  * RETURN:      Status
1213  *
1214  * DESCRIPTION: Free all objects within the requested cache.
1215  *
1216  ******************************************************************************/
1217
1218 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1219 {
1220         kmem_cache_shrink(cache);
1221         return (AE_OK);
1222 }
1223
1224 /*******************************************************************************
1225  *
1226  * FUNCTION:    acpi_os_delete_cache
1227  *
1228  * PARAMETERS:  Cache           - Handle to cache object
1229  *
1230  * RETURN:      Status
1231  *
1232  * DESCRIPTION: Free all objects within the requested cache and delete the
1233  *              cache object.
1234  *
1235  ******************************************************************************/
1236
1237 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1238 {
1239         kmem_cache_destroy(cache);
1240         return (AE_OK);
1241 }
1242
1243 /*******************************************************************************
1244  *
1245  * FUNCTION:    acpi_os_release_object
1246  *
1247  * PARAMETERS:  Cache       - Handle to cache object
1248  *              Object      - The object to be released
1249  *
1250  * RETURN:      None
1251  *
1252  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1253  *              the object is deleted.
1254  *
1255  ******************************************************************************/
1256
1257 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1258 {
1259         kmem_cache_free(cache, object);
1260         return (AE_OK);
1261 }
1262
1263 /**
1264  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1265  *
1266  *      Returns 0 on success
1267  */
1268 static int acpi_dmi_dump(void)
1269 {
1270
1271         if (!dmi_available)
1272                 return -1;
1273
1274         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1275                 dmi_get_system_info(DMI_SYS_VENDOR));
1276         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1277                 dmi_get_system_info(DMI_PRODUCT_NAME));
1278         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1279                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1280         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1281                 dmi_get_system_info(DMI_BOARD_NAME));
1282         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1283                 dmi_get_system_info(DMI_BIOS_VENDOR));
1284         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1285                 dmi_get_system_info(DMI_BIOS_DATE));
1286
1287         return 0;
1288 }
1289
1290
1291 /******************************************************************************
1292  *
1293  * FUNCTION:    acpi_os_validate_interface
1294  *
1295  * PARAMETERS:  interface           - Requested interface to be validated
1296  *
1297  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1298  *
1299  * DESCRIPTION: Match an interface string to the interfaces supported by the
1300  *              host. Strings originate from an AML call to the _OSI method.
1301  *
1302  *****************************************************************************/
1303
1304 acpi_status
1305 acpi_os_validate_interface (char *interface)
1306 {
1307         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1308                 return AE_OK;
1309         if (!strcmp("Linux", interface)) {
1310
1311                 printk(KERN_NOTICE PREFIX
1312                         "BIOS _OSI(Linux) query %s%s\n",
1313                         osi_linux.enable ? "honored" : "ignored",
1314                         osi_linux.cmdline ? " via cmdline" :
1315                         osi_linux.dmi ? " via DMI" : "");
1316
1317                 if (!osi_linux.dmi) {
1318                         if (acpi_dmi_dump())
1319                                 printk(KERN_NOTICE PREFIX
1320                                         "[please extract dmidecode output]\n");
1321                         printk(KERN_NOTICE PREFIX
1322                                 "Please send DMI info above to "
1323                                 "linux-acpi@vger.kernel.org\n");
1324                 }
1325                 if (!osi_linux.known && !osi_linux.cmdline) {
1326                         printk(KERN_NOTICE PREFIX
1327                                 "If \"acpi_osi=%sLinux\" works better, "
1328                                 "please notify linux-acpi@vger.kernel.org\n",
1329                                 osi_linux.enable ? "!" : "");
1330                 }
1331
1332                 if (osi_linux.enable)
1333                         return AE_OK;
1334         }
1335         return AE_SUPPORT;
1336 }
1337
1338 /******************************************************************************
1339  *
1340  * FUNCTION:    acpi_os_validate_address
1341  *
1342  * PARAMETERS:  space_id             - ACPI space ID
1343  *              address             - Physical address
1344  *              length              - Address length
1345  *
1346  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1347  *              should return AE_AML_ILLEGAL_ADDRESS.
1348  *
1349  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1350  *              the addresses accessed by AML operation regions.
1351  *
1352  *****************************************************************************/
1353
1354 acpi_status
1355 acpi_os_validate_address (
1356     u8                   space_id,
1357     acpi_physical_address   address,
1358     acpi_size               length,
1359     char *name)
1360 {
1361         struct acpi_res_list *res;
1362         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1363                 return AE_OK;
1364
1365         switch (space_id) {
1366         case ACPI_ADR_SPACE_SYSTEM_IO:
1367         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1368                 /* Only interference checks against SystemIO and SytemMemory
1369                    are needed */
1370                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1371                 if (!res)
1372                         return AE_OK;
1373                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1374                 strlcpy(res->name, name, 5);
1375                 res->start = address;
1376                 res->end = address + length - 1;
1377                 res->resource_type = space_id;
1378                 spin_lock(&acpi_res_lock);
1379                 list_add(&res->resource_list, &resource_list_head);
1380                 spin_unlock(&acpi_res_lock);
1381                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1382                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1383                          ? "SystemIO" : "System Memory",
1384                          (unsigned long long)res->start,
1385                          (unsigned long long)res->end,
1386                          res->name);
1387                 break;
1388         case ACPI_ADR_SPACE_PCI_CONFIG:
1389         case ACPI_ADR_SPACE_EC:
1390         case ACPI_ADR_SPACE_SMBUS:
1391         case ACPI_ADR_SPACE_CMOS:
1392         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1393         case ACPI_ADR_SPACE_DATA_TABLE:
1394         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1395                 break;
1396         }
1397         return AE_OK;
1398 }
1399
1400 #endif