Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
[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/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(KERN_CONT "%s", buffer);
232         }
233 #else
234         printk(KERN_CONT "%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 __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
276 {
277         if (acpi_gbl_permanent_mmap)
278                 iounmap(virt);
279         else
280                 __acpi_unmap_table(virt, size);
281 }
282 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
283
284 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
285 {
286         if (!acpi_gbl_permanent_mmap)
287                 __acpi_unmap_table(virt, size);
288 }
289
290 #ifdef ACPI_FUTURE_USAGE
291 acpi_status
292 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
293 {
294         if (!phys || !virt)
295                 return AE_BAD_PARAMETER;
296
297         *phys = virt_to_phys(virt);
298
299         return AE_OK;
300 }
301 #endif
302
303 #define ACPI_MAX_OVERRIDE_LEN 100
304
305 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
306
307 acpi_status
308 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
309                             acpi_string * new_val)
310 {
311         if (!init_val || !new_val)
312                 return AE_BAD_PARAMETER;
313
314         *new_val = NULL;
315         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
316                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
317                        acpi_os_name);
318                 *new_val = acpi_os_name;
319         }
320
321         return AE_OK;
322 }
323
324 acpi_status
325 acpi_os_table_override(struct acpi_table_header * existing_table,
326                        struct acpi_table_header ** new_table)
327 {
328         if (!existing_table || !new_table)
329                 return AE_BAD_PARAMETER;
330
331         *new_table = NULL;
332
333 #ifdef CONFIG_ACPI_CUSTOM_DSDT
334         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
335                 *new_table = (struct acpi_table_header *)AmlCode;
336 #endif
337         if (*new_table != NULL) {
338                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
339                            "this is unsafe: tainting kernel\n",
340                        existing_table->signature,
341                        existing_table->oem_table_id);
342                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
343         }
344         return AE_OK;
345 }
346
347 static irqreturn_t acpi_irq(int irq, void *dev_id)
348 {
349         u32 handled;
350
351         handled = (*acpi_irq_handler) (acpi_irq_context);
352
353         if (handled) {
354                 acpi_irq_handled++;
355                 return IRQ_HANDLED;
356         } else
357                 return IRQ_NONE;
358 }
359
360 acpi_status
361 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
362                                   void *context)
363 {
364         unsigned int irq;
365
366         acpi_irq_stats_init();
367
368         /*
369          * Ignore the GSI from the core, and use the value in our copy of the
370          * FADT. It may not be the same if an interrupt source override exists
371          * for the SCI.
372          */
373         gsi = acpi_gbl_FADT.sci_interrupt;
374         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
375                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
376                        gsi);
377                 return AE_OK;
378         }
379
380         acpi_irq_handler = handler;
381         acpi_irq_context = context;
382         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
383                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
384                 return AE_NOT_ACQUIRED;
385         }
386         acpi_irq_irq = irq;
387
388         return AE_OK;
389 }
390
391 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
392 {
393         if (irq) {
394                 free_irq(irq, acpi_irq);
395                 acpi_irq_handler = NULL;
396                 acpi_irq_irq = 0;
397         }
398
399         return AE_OK;
400 }
401
402 /*
403  * Running in interpreter thread context, safe to sleep
404  */
405
406 void acpi_os_sleep(acpi_integer ms)
407 {
408         schedule_timeout_interruptible(msecs_to_jiffies(ms));
409 }
410
411 void acpi_os_stall(u32 us)
412 {
413         while (us) {
414                 u32 delay = 1000;
415
416                 if (delay > us)
417                         delay = us;
418                 udelay(delay);
419                 touch_nmi_watchdog();
420                 us -= delay;
421         }
422 }
423
424 /*
425  * Support ACPI 3.0 AML Timer operand
426  * Returns 64-bit free-running, monotonically increasing timer
427  * with 100ns granularity
428  */
429 u64 acpi_os_get_timer(void)
430 {
431         static u64 t;
432
433 #ifdef  CONFIG_HPET
434         /* TBD: use HPET if available */
435 #endif
436
437 #ifdef  CONFIG_X86_PM_TIMER
438         /* TBD: default to PM timer if HPET was not available */
439 #endif
440         if (!t)
441                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
442
443         return ++t;
444 }
445
446 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
447 {
448         u32 dummy;
449
450         if (!value)
451                 value = &dummy;
452
453         *value = 0;
454         if (width <= 8) {
455                 *(u8 *) value = inb(port);
456         } else if (width <= 16) {
457                 *(u16 *) value = inw(port);
458         } else if (width <= 32) {
459                 *(u32 *) value = inl(port);
460         } else {
461                 BUG();
462         }
463
464         return AE_OK;
465 }
466
467 EXPORT_SYMBOL(acpi_os_read_port);
468
469 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
470 {
471         if (width <= 8) {
472                 outb(value, port);
473         } else if (width <= 16) {
474                 outw(value, port);
475         } else if (width <= 32) {
476                 outl(value, port);
477         } else {
478                 BUG();
479         }
480
481         return AE_OK;
482 }
483
484 EXPORT_SYMBOL(acpi_os_write_port);
485
486 acpi_status
487 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
488 {
489         u32 dummy;
490         void __iomem *virt_addr;
491
492         virt_addr = ioremap(phys_addr, width);
493         if (!value)
494                 value = &dummy;
495
496         switch (width) {
497         case 8:
498                 *(u8 *) value = readb(virt_addr);
499                 break;
500         case 16:
501                 *(u16 *) value = readw(virt_addr);
502                 break;
503         case 32:
504                 *(u32 *) value = readl(virt_addr);
505                 break;
506         default:
507                 BUG();
508         }
509
510         iounmap(virt_addr);
511
512         return AE_OK;
513 }
514
515 acpi_status
516 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
517 {
518         void __iomem *virt_addr;
519
520         virt_addr = ioremap(phys_addr, width);
521
522         switch (width) {
523         case 8:
524                 writeb(value, virt_addr);
525                 break;
526         case 16:
527                 writew(value, virt_addr);
528                 break;
529         case 32:
530                 writel(value, virt_addr);
531                 break;
532         default:
533                 BUG();
534         }
535
536         iounmap(virt_addr);
537
538         return AE_OK;
539 }
540
541 acpi_status
542 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
543                                u32 *value, u32 width)
544 {
545         int result, size;
546
547         if (!value)
548                 return AE_BAD_PARAMETER;
549
550         switch (width) {
551         case 8:
552                 size = 1;
553                 break;
554         case 16:
555                 size = 2;
556                 break;
557         case 32:
558                 size = 4;
559                 break;
560         default:
561                 return AE_ERROR;
562         }
563
564         result = raw_pci_read(pci_id->segment, pci_id->bus,
565                                 PCI_DEVFN(pci_id->device, pci_id->function),
566                                 reg, size, value);
567
568         return (result ? AE_ERROR : AE_OK);
569 }
570
571 acpi_status
572 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
573                                 acpi_integer value, u32 width)
574 {
575         int result, size;
576
577         switch (width) {
578         case 8:
579                 size = 1;
580                 break;
581         case 16:
582                 size = 2;
583                 break;
584         case 32:
585                 size = 4;
586                 break;
587         default:
588                 return AE_ERROR;
589         }
590
591         result = raw_pci_write(pci_id->segment, pci_id->bus,
592                                 PCI_DEVFN(pci_id->device, pci_id->function),
593                                 reg, size, value);
594
595         return (result ? AE_ERROR : AE_OK);
596 }
597
598 /* TODO: Change code to take advantage of driver model more */
599 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
600                                     acpi_handle chandle,        /* current node */
601                                     struct acpi_pci_id **id,
602                                     int *is_bridge, u8 * bus_number)
603 {
604         acpi_handle handle;
605         struct acpi_pci_id *pci_id = *id;
606         acpi_status status;
607         unsigned long long temp;
608         acpi_object_type type;
609
610         acpi_get_parent(chandle, &handle);
611         if (handle != rhandle) {
612                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
613                                         bus_number);
614
615                 status = acpi_get_type(handle, &type);
616                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
617                         return;
618
619                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
620                                           &temp);
621                 if (ACPI_SUCCESS(status)) {
622                         u32 val;
623                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
624                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
625
626                         if (*is_bridge)
627                                 pci_id->bus = *bus_number;
628
629                         /* any nicer way to get bus number of bridge ? */
630                         status =
631                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
632                                                            8);
633                         if (ACPI_SUCCESS(status)
634                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
635                                 status =
636                                     acpi_os_read_pci_configuration(pci_id, 0x18,
637                                                                    &val, 8);
638                                 if (!ACPI_SUCCESS(status)) {
639                                         /* Certainly broken...  FIX ME */
640                                         return;
641                                 }
642                                 *is_bridge = 1;
643                                 pci_id->bus = val;
644                                 status =
645                                     acpi_os_read_pci_configuration(pci_id, 0x19,
646                                                                    &val, 8);
647                                 if (ACPI_SUCCESS(status)) {
648                                         *bus_number = val;
649                                 }
650                         } else
651                                 *is_bridge = 0;
652                 }
653         }
654 }
655
656 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
657                            acpi_handle chandle, /* current node */
658                            struct acpi_pci_id **id)
659 {
660         int is_bridge = 1;
661         u8 bus_number = (*id)->bus;
662
663         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
664 }
665
666 static void acpi_os_execute_deferred(struct work_struct *work)
667 {
668         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
669         if (!dpc) {
670                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
671                 return;
672         }
673
674         dpc->function(dpc->context);
675         kfree(dpc);
676
677         return;
678 }
679
680 static void acpi_os_execute_hp_deferred(struct work_struct *work)
681 {
682         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
683         if (!dpc) {
684                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
685                 return;
686         }
687
688         acpi_os_wait_events_complete(NULL);
689
690         dpc->function(dpc->context);
691         kfree(dpc);
692
693         return;
694 }
695
696 /*******************************************************************************
697  *
698  * FUNCTION:    acpi_os_execute
699  *
700  * PARAMETERS:  Type               - Type of the callback
701  *              Function           - Function to be executed
702  *              Context            - Function parameters
703  *
704  * RETURN:      Status
705  *
706  * DESCRIPTION: Depending on type, either queues function for deferred execution or
707  *              immediately executes function on a separate thread.
708  *
709  ******************************************************************************/
710
711 static acpi_status __acpi_os_execute(acpi_execute_type type,
712         acpi_osd_exec_callback function, void *context, int hp)
713 {
714         acpi_status status = AE_OK;
715         struct acpi_os_dpc *dpc;
716         struct workqueue_struct *queue;
717         int ret;
718         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
719                           "Scheduling function [%p(%p)] for deferred execution.\n",
720                           function, context));
721
722         if (!function)
723                 return AE_BAD_PARAMETER;
724
725         /*
726          * Allocate/initialize DPC structure.  Note that this memory will be
727          * freed by the callee.  The kernel handles the work_struct list  in a
728          * way that allows us to also free its memory inside the callee.
729          * Because we may want to schedule several tasks with different
730          * parameters we can't use the approach some kernel code uses of
731          * having a static work_struct.
732          */
733
734         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
735         if (!dpc)
736                 return AE_NO_MEMORY;
737
738         dpc->function = function;
739         dpc->context = context;
740
741         if (!hp) {
742                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
743                 queue = (type == OSL_NOTIFY_HANDLER) ?
744                         kacpi_notify_wq : kacpid_wq;
745                 ret = queue_work(queue, &dpc->work);
746         } else {
747                 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
748                 ret = schedule_work(&dpc->work);
749         }
750
751         if (!ret) {
752                 printk(KERN_ERR PREFIX
753                           "Call to queue_work() failed.\n");
754                 status = AE_ERROR;
755                 kfree(dpc);
756         }
757         return status;
758 }
759
760 acpi_status acpi_os_execute(acpi_execute_type type,
761                             acpi_osd_exec_callback function, void *context)
762 {
763         return __acpi_os_execute(type, function, context, 0);
764 }
765 EXPORT_SYMBOL(acpi_os_execute);
766
767 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
768         void *context)
769 {
770         return __acpi_os_execute(0, function, context, 1);
771 }
772
773 void acpi_os_wait_events_complete(void *context)
774 {
775         flush_workqueue(kacpid_wq);
776         flush_workqueue(kacpi_notify_wq);
777 }
778
779 EXPORT_SYMBOL(acpi_os_wait_events_complete);
780
781 /*
782  * Allocate the memory for a spinlock and initialize it.
783  */
784 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
785 {
786         spin_lock_init(*handle);
787
788         return AE_OK;
789 }
790
791 /*
792  * Deallocate the memory for a spinlock.
793  */
794 void acpi_os_delete_lock(acpi_spinlock handle)
795 {
796         return;
797 }
798
799 acpi_status
800 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
801 {
802         struct semaphore *sem = NULL;
803
804         sem = acpi_os_allocate(sizeof(struct semaphore));
805         if (!sem)
806                 return AE_NO_MEMORY;
807         memset(sem, 0, sizeof(struct semaphore));
808
809         sema_init(sem, initial_units);
810
811         *handle = (acpi_handle *) sem;
812
813         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
814                           *handle, initial_units));
815
816         return AE_OK;
817 }
818
819 /*
820  * TODO: A better way to delete semaphores?  Linux doesn't have a
821  * 'delete_semaphore()' function -- may result in an invalid
822  * pointer dereference for non-synchronized consumers.  Should
823  * we at least check for blocked threads and signal/cancel them?
824  */
825
826 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
827 {
828         struct semaphore *sem = (struct semaphore *)handle;
829
830         if (!sem)
831                 return AE_BAD_PARAMETER;
832
833         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
834
835         BUG_ON(!list_empty(&sem->wait_list));
836         kfree(sem);
837         sem = NULL;
838
839         return AE_OK;
840 }
841
842 /*
843  * TODO: Support for units > 1?
844  */
845 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
846 {
847         acpi_status status = AE_OK;
848         struct semaphore *sem = (struct semaphore *)handle;
849         long jiffies;
850         int ret = 0;
851
852         if (!sem || (units < 1))
853                 return AE_BAD_PARAMETER;
854
855         if (units > 1)
856                 return AE_SUPPORT;
857
858         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
859                           handle, units, timeout));
860
861         if (timeout == ACPI_WAIT_FOREVER)
862                 jiffies = MAX_SCHEDULE_TIMEOUT;
863         else
864                 jiffies = msecs_to_jiffies(timeout);
865         
866         ret = down_timeout(sem, jiffies);
867         if (ret)
868                 status = AE_TIME;
869
870         if (ACPI_FAILURE(status)) {
871                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
872                                   "Failed to acquire semaphore[%p|%d|%d], %s",
873                                   handle, units, timeout,
874                                   acpi_format_exception(status)));
875         } else {
876                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
877                                   "Acquired semaphore[%p|%d|%d]", handle,
878                                   units, timeout));
879         }
880
881         return status;
882 }
883
884 /*
885  * TODO: Support for units > 1?
886  */
887 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
888 {
889         struct semaphore *sem = (struct semaphore *)handle;
890
891         if (!sem || (units < 1))
892                 return AE_BAD_PARAMETER;
893
894         if (units > 1)
895                 return AE_SUPPORT;
896
897         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
898                           units));
899
900         up(sem);
901
902         return AE_OK;
903 }
904
905 #ifdef ACPI_FUTURE_USAGE
906 u32 acpi_os_get_line(char *buffer)
907 {
908
909 #ifdef ENABLE_DEBUGGER
910         if (acpi_in_debugger) {
911                 u32 chars;
912
913                 kdb_read(buffer, sizeof(line_buf));
914
915                 /* remove the CR kdb includes */
916                 chars = strlen(buffer) - 1;
917                 buffer[chars] = '\0';
918         }
919 #endif
920
921         return 0;
922 }
923 #endif                          /*  ACPI_FUTURE_USAGE  */
924
925 acpi_status acpi_os_signal(u32 function, void *info)
926 {
927         switch (function) {
928         case ACPI_SIGNAL_FATAL:
929                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
930                 break;
931         case ACPI_SIGNAL_BREAKPOINT:
932                 /*
933                  * AML Breakpoint
934                  * ACPI spec. says to treat it as a NOP unless
935                  * you are debugging.  So if/when we integrate
936                  * AML debugger into the kernel debugger its
937                  * hook will go here.  But until then it is
938                  * not useful to print anything on breakpoints.
939                  */
940                 break;
941         default:
942                 break;
943         }
944
945         return AE_OK;
946 }
947
948 static int __init acpi_os_name_setup(char *str)
949 {
950         char *p = acpi_os_name;
951         int count = ACPI_MAX_OVERRIDE_LEN - 1;
952
953         if (!str || !*str)
954                 return 0;
955
956         for (; count-- && str && *str; str++) {
957                 if (isalnum(*str) || *str == ' ' || *str == ':')
958                         *p++ = *str;
959                 else if (*str == '\'' || *str == '"')
960                         continue;
961                 else
962                         break;
963         }
964         *p = 0;
965
966         return 1;
967
968 }
969
970 __setup("acpi_os_name=", acpi_os_name_setup);
971
972 static void __init set_osi_linux(unsigned int enable)
973 {
974         if (osi_linux.enable != enable) {
975                 osi_linux.enable = enable;
976                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
977                         enable ? "Add": "Delet");
978         }
979         return;
980 }
981
982 static void __init acpi_cmdline_osi_linux(unsigned int enable)
983 {
984         osi_linux.cmdline = 1;  /* cmdline set the default */
985         set_osi_linux(enable);
986
987         return;
988 }
989
990 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
991 {
992         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
993
994         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
995
996         if (enable == -1)
997                 return;
998
999         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1000
1001         set_osi_linux(enable);
1002
1003         return;
1004 }
1005
1006 /*
1007  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1008  *
1009  * empty string disables _OSI
1010  * string starting with '!' disables that string
1011  * otherwise string is added to list, augmenting built-in strings
1012  */
1013 int __init acpi_osi_setup(char *str)
1014 {
1015         if (str == NULL || *str == '\0') {
1016                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1017                 acpi_gbl_create_osi_method = FALSE;
1018         } else if (!strcmp("!Linux", str)) {
1019                 acpi_cmdline_osi_linux(0);      /* !enable */
1020         } else if (*str == '!') {
1021                 if (acpi_osi_invalidate(++str) == AE_OK)
1022                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1023         } else if (!strcmp("Linux", str)) {
1024                 acpi_cmdline_osi_linux(1);      /* enable */
1025         } else if (*osi_additional_string == '\0') {
1026                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1027                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1028         }
1029
1030         return 1;
1031 }
1032
1033 __setup("acpi_osi=", acpi_osi_setup);
1034
1035 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1036 static int __init acpi_serialize_setup(char *str)
1037 {
1038         printk(KERN_INFO PREFIX "serialize enabled\n");
1039
1040         acpi_gbl_all_methods_serialized = TRUE;
1041
1042         return 1;
1043 }
1044
1045 __setup("acpi_serialize", acpi_serialize_setup);
1046
1047 /*
1048  * Wake and Run-Time GPES are expected to be separate.
1049  * We disable wake-GPEs at run-time to prevent spurious
1050  * interrupts.
1051  *
1052  * However, if a system exists that shares Wake and
1053  * Run-time events on the same GPE this flag is available
1054  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1055  */
1056 static int __init acpi_wake_gpes_always_on_setup(char *str)
1057 {
1058         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1059
1060         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1061
1062         return 1;
1063 }
1064
1065 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1066
1067 /* Check of resource interference between native drivers and ACPI
1068  * OperationRegions (SystemIO and System Memory only).
1069  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1070  * in arbitrary AML code and can interfere with legacy drivers.
1071  * acpi_enforce_resources= can be set to:
1072  *
1073  *   - strict           (2)
1074  *     -> further driver trying to access the resources will not load
1075  *   - lax (default)    (1)
1076  *     -> further driver trying to access the resources will load, but you
1077  *     get a system message that something might go wrong...
1078  *
1079  *   - no               (0)
1080  *     -> ACPI Operation Region resources will not be registered
1081  *
1082  */
1083 #define ENFORCE_RESOURCES_STRICT 2
1084 #define ENFORCE_RESOURCES_LAX    1
1085 #define ENFORCE_RESOURCES_NO     0
1086
1087 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1088
1089 static int __init acpi_enforce_resources_setup(char *str)
1090 {
1091         if (str == NULL || *str == '\0')
1092                 return 0;
1093
1094         if (!strcmp("strict", str))
1095                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1096         else if (!strcmp("lax", str))
1097                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1098         else if (!strcmp("no", str))
1099                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1100
1101         return 1;
1102 }
1103
1104 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1105
1106 /* Check for resource conflicts between ACPI OperationRegions and native
1107  * drivers */
1108 int acpi_check_resource_conflict(struct resource *res)
1109 {
1110         struct acpi_res_list *res_list_elem;
1111         int ioport;
1112         int clash = 0;
1113
1114         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1115                 return 0;
1116         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1117                 return 0;
1118
1119         ioport = res->flags & IORESOURCE_IO;
1120
1121         spin_lock(&acpi_res_lock);
1122         list_for_each_entry(res_list_elem, &resource_list_head,
1123                             resource_list) {
1124                 if (ioport && (res_list_elem->resource_type
1125                                != ACPI_ADR_SPACE_SYSTEM_IO))
1126                         continue;
1127                 if (!ioport && (res_list_elem->resource_type
1128                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1129                         continue;
1130
1131                 if (res->end < res_list_elem->start
1132                     || res_list_elem->end < res->start)
1133                         continue;
1134                 clash = 1;
1135                 break;
1136         }
1137         spin_unlock(&acpi_res_lock);
1138
1139         if (clash) {
1140                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1141                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1142                                " conflicts with ACPI region %s"
1143                                " [0x%llx-0x%llx]\n",
1144                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1145                                ? KERN_WARNING : KERN_ERR,
1146                                ioport ? "I/O" : "Memory", res->name,
1147                                (long long) res->start, (long long) res->end,
1148                                res_list_elem->name,
1149                                (long long) res_list_elem->start,
1150                                (long long) res_list_elem->end);
1151                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1152                 }
1153                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1154                         return -EBUSY;
1155         }
1156         return 0;
1157 }
1158 EXPORT_SYMBOL(acpi_check_resource_conflict);
1159
1160 int acpi_check_region(resource_size_t start, resource_size_t n,
1161                       const char *name)
1162 {
1163         struct resource res = {
1164                 .start = start,
1165                 .end   = start + n - 1,
1166                 .name  = name,
1167                 .flags = IORESOURCE_IO,
1168         };
1169
1170         return acpi_check_resource_conflict(&res);
1171 }
1172 EXPORT_SYMBOL(acpi_check_region);
1173
1174 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1175                       const char *name)
1176 {
1177         struct resource res = {
1178                 .start = start,
1179                 .end   = start + n - 1,
1180                 .name  = name,
1181                 .flags = IORESOURCE_MEM,
1182         };
1183
1184         return acpi_check_resource_conflict(&res);
1185
1186 }
1187 EXPORT_SYMBOL(acpi_check_mem_region);
1188
1189 /*
1190  * Acquire a spinlock.
1191  *
1192  * handle is a pointer to the spinlock_t.
1193  */
1194
1195 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1196 {
1197         acpi_cpu_flags flags;
1198         spin_lock_irqsave(lockp, flags);
1199         return flags;
1200 }
1201
1202 /*
1203  * Release a spinlock. See above.
1204  */
1205
1206 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1207 {
1208         spin_unlock_irqrestore(lockp, flags);
1209 }
1210
1211 #ifndef ACPI_USE_LOCAL_CACHE
1212
1213 /*******************************************************************************
1214  *
1215  * FUNCTION:    acpi_os_create_cache
1216  *
1217  * PARAMETERS:  name      - Ascii name for the cache
1218  *              size      - Size of each cached object
1219  *              depth     - Maximum depth of the cache (in objects) <ignored>
1220  *              cache     - Where the new cache object is returned
1221  *
1222  * RETURN:      status
1223  *
1224  * DESCRIPTION: Create a cache object
1225  *
1226  ******************************************************************************/
1227
1228 acpi_status
1229 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1230 {
1231         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1232         if (*cache == NULL)
1233                 return AE_ERROR;
1234         else
1235                 return AE_OK;
1236 }
1237
1238 /*******************************************************************************
1239  *
1240  * FUNCTION:    acpi_os_purge_cache
1241  *
1242  * PARAMETERS:  Cache           - Handle to cache object
1243  *
1244  * RETURN:      Status
1245  *
1246  * DESCRIPTION: Free all objects within the requested cache.
1247  *
1248  ******************************************************************************/
1249
1250 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1251 {
1252         kmem_cache_shrink(cache);
1253         return (AE_OK);
1254 }
1255
1256 /*******************************************************************************
1257  *
1258  * FUNCTION:    acpi_os_delete_cache
1259  *
1260  * PARAMETERS:  Cache           - Handle to cache object
1261  *
1262  * RETURN:      Status
1263  *
1264  * DESCRIPTION: Free all objects within the requested cache and delete the
1265  *              cache object.
1266  *
1267  ******************************************************************************/
1268
1269 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1270 {
1271         kmem_cache_destroy(cache);
1272         return (AE_OK);
1273 }
1274
1275 /*******************************************************************************
1276  *
1277  * FUNCTION:    acpi_os_release_object
1278  *
1279  * PARAMETERS:  Cache       - Handle to cache object
1280  *              Object      - The object to be released
1281  *
1282  * RETURN:      None
1283  *
1284  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1285  *              the object is deleted.
1286  *
1287  ******************************************************************************/
1288
1289 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1290 {
1291         kmem_cache_free(cache, object);
1292         return (AE_OK);
1293 }
1294
1295 /******************************************************************************
1296  *
1297  * FUNCTION:    acpi_os_validate_interface
1298  *
1299  * PARAMETERS:  interface           - Requested interface to be validated
1300  *
1301  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1302  *
1303  * DESCRIPTION: Match an interface string to the interfaces supported by the
1304  *              host. Strings originate from an AML call to the _OSI method.
1305  *
1306  *****************************************************************************/
1307
1308 acpi_status
1309 acpi_os_validate_interface (char *interface)
1310 {
1311         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1312                 return AE_OK;
1313         if (!strcmp("Linux", interface)) {
1314
1315                 printk(KERN_NOTICE PREFIX
1316                         "BIOS _OSI(Linux) query %s%s\n",
1317                         osi_linux.enable ? "honored" : "ignored",
1318                         osi_linux.cmdline ? " via cmdline" :
1319                         osi_linux.dmi ? " via DMI" : "");
1320
1321                 if (osi_linux.enable)
1322                         return AE_OK;
1323         }
1324         return AE_SUPPORT;
1325 }
1326
1327 /******************************************************************************
1328  *
1329  * FUNCTION:    acpi_os_validate_address
1330  *
1331  * PARAMETERS:  space_id             - ACPI space ID
1332  *              address             - Physical address
1333  *              length              - Address length
1334  *
1335  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1336  *              should return AE_AML_ILLEGAL_ADDRESS.
1337  *
1338  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1339  *              the addresses accessed by AML operation regions.
1340  *
1341  *****************************************************************************/
1342
1343 acpi_status
1344 acpi_os_validate_address (
1345     u8                   space_id,
1346     acpi_physical_address   address,
1347     acpi_size               length,
1348     char *name)
1349 {
1350         struct acpi_res_list *res;
1351         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1352                 return AE_OK;
1353
1354         switch (space_id) {
1355         case ACPI_ADR_SPACE_SYSTEM_IO:
1356         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1357                 /* Only interference checks against SystemIO and SytemMemory
1358                    are needed */
1359                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1360                 if (!res)
1361                         return AE_OK;
1362                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1363                 strlcpy(res->name, name, 5);
1364                 res->start = address;
1365                 res->end = address + length - 1;
1366                 res->resource_type = space_id;
1367                 spin_lock(&acpi_res_lock);
1368                 list_add(&res->resource_list, &resource_list_head);
1369                 spin_unlock(&acpi_res_lock);
1370                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1371                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1372                          ? "SystemIO" : "System Memory",
1373                          (unsigned long long)res->start,
1374                          (unsigned long long)res->end,
1375                          res->name);
1376                 break;
1377         case ACPI_ADR_SPACE_PCI_CONFIG:
1378         case ACPI_ADR_SPACE_EC:
1379         case ACPI_ADR_SPACE_SMBUS:
1380         case ACPI_ADR_SPACE_CMOS:
1381         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1382         case ACPI_ADR_SPACE_DATA_TABLE:
1383         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1384                 break;
1385         }
1386         return AE_OK;
1387 }
1388
1389 #endif