Merge commit 'v2.6.28-rc7' into core/locking
[linux-2.6] / 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_ACPI_STATUS(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_ACPI_STATUS(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