Merge branch 'linus' into test
[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/dmi.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
47
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
54
55 #define _COMPONENT              ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX          "ACPI: "
58 struct acpi_os_dpc {
59         acpi_osd_exec_callback function;
60         void *context;
61         struct work_struct work;
62 };
63
64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
66 #endif
67
68 #ifdef ENABLE_DEBUGGER
69 #include <linux/kdb.h>
70
71 /* stuff for debugger support */
72 int acpi_in_debugger;
73 EXPORT_SYMBOL(acpi_in_debugger);
74
75 extern char line_buf[80];
76 #endif                          /*ENABLE_DEBUGGER */
77
78 static unsigned int acpi_irq_irq;
79 static acpi_osd_handler acpi_irq_handler;
80 static void *acpi_irq_context;
81 static struct workqueue_struct *kacpid_wq;
82 static struct workqueue_struct *kacpi_notify_wq;
83
84 struct acpi_res_list {
85         resource_size_t start;
86         resource_size_t end;
87         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
88         char name[5];   /* only can have a length of 4 chars, make use of this
89                            one instead of res->name, no need to kalloc then */
90         struct list_head resource_list;
91 };
92
93 static LIST_HEAD(resource_list_head);
94 static DEFINE_SPINLOCK(acpi_res_lock);
95
96 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
97 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
98
99 /*
100  * "Ode to _OSI(Linux)"
101  *
102  * osi_linux -- Control response to BIOS _OSI(Linux) query.
103  *
104  * As Linux evolves, the features that it supports change.
105  * So an OSI string such as "Linux" is not specific enough
106  * to be useful across multiple versions of Linux.  It
107  * doesn't identify any particular feature, interface,
108  * or even any particular version of Linux...
109  *
110  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
111  * to a BIOS _OSI(Linux) query.  When
112  * a reference mobile BIOS started using it, its use
113  * started to spread to many vendor platforms.
114  * As it is not supportable, we need to halt that spread.
115  *
116  * Today, most BIOS references to _OSI(Linux) are noise --
117  * they have no functional effect and are just dead code
118  * carried over from the reference BIOS.
119  *
120  * The next most common case is that _OSI(Linux) harms Linux,
121  * usually by causing the BIOS to follow paths that are
122  * not tested during Windows validation.
123  *
124  * Finally, there is a short list of platforms
125  * where OSI(Linux) benefits Linux.
126  *
127  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
128  * DMI is used to disable the dmesg warning about OSI(Linux)
129  * on platforms where it is known to have no effect.
130  * But a dmesg warning remains for systems where
131  * we do not know if OSI(Linux) is good or bad for the system.
132  * DMI is also used to enable OSI(Linux) for the machines
133  * that are known to need it.
134  *
135  * BIOS writers should NOT query _OSI(Linux) on future systems.
136  * It will be ignored by default, and to get Linux to
137  * not ignore it will require a kernel source update to
138  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
139  */
140 #define OSI_LINUX_ENABLE 0
141
142 static struct osi_linux {
143         unsigned int    enable:1;
144         unsigned int    dmi:1;
145         unsigned int    cmdline:1;
146         unsigned int    known:1;
147 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
148
149 static void __init acpi_request_region (struct acpi_generic_address *addr,
150         unsigned int length, char *desc)
151 {
152         struct resource *res;
153
154         if (!addr->address || !length)
155                 return;
156
157         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
158                 res = request_region(addr->address, length, desc);
159         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
160                 res = request_mem_region(addr->address, length, desc);
161 }
162
163 static int __init acpi_reserve_resources(void)
164 {
165         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
166                 "ACPI PM1a_EVT_BLK");
167
168         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
169                 "ACPI PM1b_EVT_BLK");
170
171         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
172                 "ACPI PM1a_CNT_BLK");
173
174         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
175                 "ACPI PM1b_CNT_BLK");
176
177         if (acpi_gbl_FADT.pm_timer_length == 4)
178                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
179
180         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
181                 "ACPI PM2_CNT_BLK");
182
183         /* Length of GPE blocks must be a non-negative multiple of 2 */
184
185         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
186                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
187                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
188
189         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
190                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
191                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
192
193         return 0;
194 }
195 device_initcall(acpi_reserve_resources);
196
197 acpi_status __init acpi_os_initialize(void)
198 {
199         return AE_OK;
200 }
201
202 acpi_status acpi_os_initialize1(void)
203 {
204         kacpid_wq = create_singlethread_workqueue("kacpid");
205         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
206         BUG_ON(!kacpid_wq);
207         BUG_ON(!kacpi_notify_wq);
208         return AE_OK;
209 }
210
211 acpi_status acpi_os_terminate(void)
212 {
213         if (acpi_irq_handler) {
214                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
215                                                  acpi_irq_handler);
216         }
217
218         destroy_workqueue(kacpid_wq);
219         destroy_workqueue(kacpi_notify_wq);
220
221         return AE_OK;
222 }
223
224 void acpi_os_printf(const char *fmt, ...)
225 {
226         va_list args;
227         va_start(args, fmt);
228         acpi_os_vprintf(fmt, args);
229         va_end(args);
230 }
231
232 void acpi_os_vprintf(const char *fmt, va_list args)
233 {
234         static char buffer[512];
235
236         vsprintf(buffer, fmt, args);
237
238 #ifdef ENABLE_DEBUGGER
239         if (acpi_in_debugger) {
240                 kdb_printf("%s", buffer);
241         } else {
242                 printk("%s", buffer);
243         }
244 #else
245         printk("%s", buffer);
246 #endif
247 }
248
249 acpi_physical_address __init acpi_os_get_root_pointer(void)
250 {
251         if (efi_enabled) {
252                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
253                         return efi.acpi20;
254                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
255                         return efi.acpi;
256                 else {
257                         printk(KERN_ERR PREFIX
258                                "System description tables not found\n");
259                         return 0;
260                 }
261         } else {
262                 acpi_physical_address pa = 0;
263
264                 acpi_find_root_pointer(&pa);
265                 return pa;
266         }
267 }
268
269 void __iomem *__init_refok
270 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
271 {
272         if (phys > ULONG_MAX) {
273                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
274                 return NULL;
275         }
276         if (acpi_gbl_permanent_mmap)
277                 /*
278                 * ioremap checks to ensure this is in reserved space
279                 */
280                 return ioremap((unsigned long)phys, size);
281         else
282                 return __acpi_map_table((unsigned long)phys, size);
283 }
284 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
285
286 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
287 {
288         if (acpi_gbl_permanent_mmap) {
289                 iounmap(virt);
290         }
291 }
292 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
293
294 #ifdef ACPI_FUTURE_USAGE
295 acpi_status
296 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
297 {
298         if (!phys || !virt)
299                 return AE_BAD_PARAMETER;
300
301         *phys = virt_to_phys(virt);
302
303         return AE_OK;
304 }
305 #endif
306
307 #define ACPI_MAX_OVERRIDE_LEN 100
308
309 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
310
311 acpi_status
312 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
313                             acpi_string * new_val)
314 {
315         if (!init_val || !new_val)
316                 return AE_BAD_PARAMETER;
317
318         *new_val = NULL;
319         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
320                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
321                        acpi_os_name);
322                 *new_val = acpi_os_name;
323         }
324
325         return AE_OK;
326 }
327
328 acpi_status
329 acpi_os_table_override(struct acpi_table_header * existing_table,
330                        struct acpi_table_header ** new_table)
331 {
332         if (!existing_table || !new_table)
333                 return AE_BAD_PARAMETER;
334
335         *new_table = NULL;
336
337 #ifdef CONFIG_ACPI_CUSTOM_DSDT
338         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
339                 *new_table = (struct acpi_table_header *)AmlCode;
340 #endif
341         if (*new_table != NULL) {
342                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
343                            "this is unsafe: tainting kernel\n",
344                        existing_table->signature,
345                        existing_table->oem_table_id);
346                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
347         }
348         return AE_OK;
349 }
350
351 static irqreturn_t acpi_irq(int irq, void *dev_id)
352 {
353         u32 handled;
354
355         handled = (*acpi_irq_handler) (acpi_irq_context);
356
357         if (handled) {
358                 acpi_irq_handled++;
359                 return IRQ_HANDLED;
360         } else
361                 return IRQ_NONE;
362 }
363
364 acpi_status
365 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
366                                   void *context)
367 {
368         unsigned int irq;
369
370         acpi_irq_stats_init();
371
372         /*
373          * Ignore the GSI from the core, and use the value in our copy of the
374          * FADT. It may not be the same if an interrupt source override exists
375          * for the SCI.
376          */
377         gsi = acpi_gbl_FADT.sci_interrupt;
378         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
379                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
380                        gsi);
381                 return AE_OK;
382         }
383
384         acpi_irq_handler = handler;
385         acpi_irq_context = context;
386         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
387                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
388                 return AE_NOT_ACQUIRED;
389         }
390         acpi_irq_irq = irq;
391
392         return AE_OK;
393 }
394
395 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
396 {
397         if (irq) {
398                 free_irq(irq, acpi_irq);
399                 acpi_irq_handler = NULL;
400                 acpi_irq_irq = 0;
401         }
402
403         return AE_OK;
404 }
405
406 /*
407  * Running in interpreter thread context, safe to sleep
408  */
409
410 void acpi_os_sleep(acpi_integer ms)
411 {
412         schedule_timeout_interruptible(msecs_to_jiffies(ms));
413 }
414
415 void acpi_os_stall(u32 us)
416 {
417         while (us) {
418                 u32 delay = 1000;
419
420                 if (delay > us)
421                         delay = us;
422                 udelay(delay);
423                 touch_nmi_watchdog();
424                 us -= delay;
425         }
426 }
427
428 /*
429  * Support ACPI 3.0 AML Timer operand
430  * Returns 64-bit free-running, monotonically increasing timer
431  * with 100ns granularity
432  */
433 u64 acpi_os_get_timer(void)
434 {
435         static u64 t;
436
437 #ifdef  CONFIG_HPET
438         /* TBD: use HPET if available */
439 #endif
440
441 #ifdef  CONFIG_X86_PM_TIMER
442         /* TBD: default to PM timer if HPET was not available */
443 #endif
444         if (!t)
445                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
446
447         return ++t;
448 }
449
450 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
451 {
452         u32 dummy;
453
454         if (!value)
455                 value = &dummy;
456
457         *value = 0;
458         if (width <= 8) {
459                 *(u8 *) value = inb(port);
460         } else if (width <= 16) {
461                 *(u16 *) value = inw(port);
462         } else if (width <= 32) {
463                 *(u32 *) value = inl(port);
464         } else {
465                 BUG();
466         }
467
468         return AE_OK;
469 }
470
471 EXPORT_SYMBOL(acpi_os_read_port);
472
473 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
474 {
475         if (width <= 8) {
476                 outb(value, port);
477         } else if (width <= 16) {
478                 outw(value, port);
479         } else if (width <= 32) {
480                 outl(value, port);
481         } else {
482                 BUG();
483         }
484
485         return AE_OK;
486 }
487
488 EXPORT_SYMBOL(acpi_os_write_port);
489
490 acpi_status
491 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
492 {
493         u32 dummy;
494         void __iomem *virt_addr;
495
496         virt_addr = ioremap(phys_addr, width);
497         if (!value)
498                 value = &dummy;
499
500         switch (width) {
501         case 8:
502                 *(u8 *) value = readb(virt_addr);
503                 break;
504         case 16:
505                 *(u16 *) value = readw(virt_addr);
506                 break;
507         case 32:
508                 *(u32 *) value = readl(virt_addr);
509                 break;
510         default:
511                 BUG();
512         }
513
514         iounmap(virt_addr);
515
516         return AE_OK;
517 }
518
519 acpi_status
520 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
521 {
522         void __iomem *virt_addr;
523
524         virt_addr = ioremap(phys_addr, width);
525
526         switch (width) {
527         case 8:
528                 writeb(value, virt_addr);
529                 break;
530         case 16:
531                 writew(value, virt_addr);
532                 break;
533         case 32:
534                 writel(value, virt_addr);
535                 break;
536         default:
537                 BUG();
538         }
539
540         iounmap(virt_addr);
541
542         return AE_OK;
543 }
544
545 acpi_status
546 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
547                                u32 *value, u32 width)
548 {
549         int result, size;
550
551         if (!value)
552                 return AE_BAD_PARAMETER;
553
554         switch (width) {
555         case 8:
556                 size = 1;
557                 break;
558         case 16:
559                 size = 2;
560                 break;
561         case 32:
562                 size = 4;
563                 break;
564         default:
565                 return AE_ERROR;
566         }
567
568         result = raw_pci_read(pci_id->segment, pci_id->bus,
569                                 PCI_DEVFN(pci_id->device, pci_id->function),
570                                 reg, size, value);
571
572         return (result ? AE_ERROR : AE_OK);
573 }
574
575 acpi_status
576 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
577                                 acpi_integer value, u32 width)
578 {
579         int result, size;
580
581         switch (width) {
582         case 8:
583                 size = 1;
584                 break;
585         case 16:
586                 size = 2;
587                 break;
588         case 32:
589                 size = 4;
590                 break;
591         default:
592                 return AE_ERROR;
593         }
594
595         result = raw_pci_write(pci_id->segment, pci_id->bus,
596                                 PCI_DEVFN(pci_id->device, pci_id->function),
597                                 reg, size, value);
598
599         return (result ? AE_ERROR : AE_OK);
600 }
601
602 /* TODO: Change code to take advantage of driver model more */
603 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
604                                     acpi_handle chandle,        /* current node */
605                                     struct acpi_pci_id **id,
606                                     int *is_bridge, u8 * bus_number)
607 {
608         acpi_handle handle;
609         struct acpi_pci_id *pci_id = *id;
610         acpi_status status;
611         unsigned long long temp;
612         acpi_object_type type;
613
614         acpi_get_parent(chandle, &handle);
615         if (handle != rhandle) {
616                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
617                                         bus_number);
618
619                 status = acpi_get_type(handle, &type);
620                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
621                         return;
622
623                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
624                                           &temp);
625                 if (ACPI_SUCCESS(status)) {
626                         u32 val;
627                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
628                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
629
630                         if (*is_bridge)
631                                 pci_id->bus = *bus_number;
632
633                         /* any nicer way to get bus number of bridge ? */
634                         status =
635                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
636                                                            8);
637                         if (ACPI_SUCCESS(status)
638                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
639                                 status =
640                                     acpi_os_read_pci_configuration(pci_id, 0x18,
641                                                                    &val, 8);
642                                 if (!ACPI_SUCCESS(status)) {
643                                         /* Certainly broken...  FIX ME */
644                                         return;
645                                 }
646                                 *is_bridge = 1;
647                                 pci_id->bus = val;
648                                 status =
649                                     acpi_os_read_pci_configuration(pci_id, 0x19,
650                                                                    &val, 8);
651                                 if (ACPI_SUCCESS(status)) {
652                                         *bus_number = val;
653                                 }
654                         } else
655                                 *is_bridge = 0;
656                 }
657         }
658 }
659
660 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
661                            acpi_handle chandle, /* current node */
662                            struct acpi_pci_id **id)
663 {
664         int is_bridge = 1;
665         u8 bus_number = (*id)->bus;
666
667         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
668 }
669
670 static void acpi_os_execute_deferred(struct work_struct *work)
671 {
672         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
673         if (!dpc) {
674                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
675                 return;
676         }
677
678         dpc->function(dpc->context);
679         kfree(dpc);
680
681         return;
682 }
683
684 static void acpi_os_execute_hp_deferred(struct work_struct *work)
685 {
686         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
687         if (!dpc) {
688                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
689                 return;
690         }
691
692         acpi_os_wait_events_complete(NULL);
693
694         dpc->function(dpc->context);
695         kfree(dpc);
696
697         return;
698 }
699
700 /*******************************************************************************
701  *
702  * FUNCTION:    acpi_os_execute
703  *
704  * PARAMETERS:  Type               - Type of the callback
705  *              Function           - Function to be executed
706  *              Context            - Function parameters
707  *
708  * RETURN:      Status
709  *
710  * DESCRIPTION: Depending on type, either queues function for deferred execution or
711  *              immediately executes function on a separate thread.
712  *
713  ******************************************************************************/
714
715 static acpi_status __acpi_os_execute(acpi_execute_type type,
716         acpi_osd_exec_callback function, void *context, int hp)
717 {
718         acpi_status status = AE_OK;
719         struct acpi_os_dpc *dpc;
720         struct workqueue_struct *queue;
721         int ret;
722         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
723                           "Scheduling function [%p(%p)] for deferred execution.\n",
724                           function, context));
725
726         if (!function)
727                 return AE_BAD_PARAMETER;
728
729         /*
730          * Allocate/initialize DPC structure.  Note that this memory will be
731          * freed by the callee.  The kernel handles the work_struct list  in a
732          * way that allows us to also free its memory inside the callee.
733          * Because we may want to schedule several tasks with different
734          * parameters we can't use the approach some kernel code uses of
735          * having a static work_struct.
736          */
737
738         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
739         if (!dpc)
740                 return_ACPI_STATUS(AE_NO_MEMORY);
741
742         dpc->function = function;
743         dpc->context = context;
744
745         if (!hp) {
746                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
747                 queue = (type == OSL_NOTIFY_HANDLER) ?
748                         kacpi_notify_wq : kacpid_wq;
749                 ret = queue_work(queue, &dpc->work);
750         } else {
751                 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
752                 ret = schedule_work(&dpc->work);
753         }
754
755         if (!ret) {
756                 printk(KERN_ERR PREFIX
757                           "Call to queue_work() failed.\n");
758                 status = AE_ERROR;
759                 kfree(dpc);
760         }
761         return_ACPI_STATUS(status);
762 }
763
764 acpi_status acpi_os_execute(acpi_execute_type type,
765                             acpi_osd_exec_callback function, void *context)
766 {
767         return __acpi_os_execute(type, function, context, 0);
768 }
769 EXPORT_SYMBOL(acpi_os_execute);
770
771 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
772         void *context)
773 {
774         return __acpi_os_execute(0, function, context, 1);
775 }
776
777 void acpi_os_wait_events_complete(void *context)
778 {
779         flush_workqueue(kacpid_wq);
780         flush_workqueue(kacpi_notify_wq);
781 }
782
783 EXPORT_SYMBOL(acpi_os_wait_events_complete);
784
785 /*
786  * Allocate the memory for a spinlock and initialize it.
787  */
788 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
789 {
790         spin_lock_init(*handle);
791
792         return AE_OK;
793 }
794
795 /*
796  * Deallocate the memory for a spinlock.
797  */
798 void acpi_os_delete_lock(acpi_spinlock handle)
799 {
800         return;
801 }
802
803 acpi_status
804 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
805 {
806         struct semaphore *sem = NULL;
807
808         sem = acpi_os_allocate(sizeof(struct semaphore));
809         if (!sem)
810                 return AE_NO_MEMORY;
811         memset(sem, 0, sizeof(struct semaphore));
812
813         sema_init(sem, initial_units);
814
815         *handle = (acpi_handle *) sem;
816
817         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
818                           *handle, initial_units));
819
820         return AE_OK;
821 }
822
823 /*
824  * TODO: A better way to delete semaphores?  Linux doesn't have a
825  * 'delete_semaphore()' function -- may result in an invalid
826  * pointer dereference for non-synchronized consumers.  Should
827  * we at least check for blocked threads and signal/cancel them?
828  */
829
830 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
831 {
832         struct semaphore *sem = (struct semaphore *)handle;
833
834         if (!sem)
835                 return AE_BAD_PARAMETER;
836
837         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
838
839         BUG_ON(!list_empty(&sem->wait_list));
840         kfree(sem);
841         sem = NULL;
842
843         return AE_OK;
844 }
845
846 /*
847  * TODO: Support for units > 1?
848  */
849 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
850 {
851         acpi_status status = AE_OK;
852         struct semaphore *sem = (struct semaphore *)handle;
853         long jiffies;
854         int ret = 0;
855
856         if (!sem || (units < 1))
857                 return AE_BAD_PARAMETER;
858
859         if (units > 1)
860                 return AE_SUPPORT;
861
862         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
863                           handle, units, timeout));
864
865         if (timeout == ACPI_WAIT_FOREVER)
866                 jiffies = MAX_SCHEDULE_TIMEOUT;
867         else
868                 jiffies = msecs_to_jiffies(timeout);
869         
870         ret = down_timeout(sem, jiffies);
871         if (ret)
872                 status = AE_TIME;
873
874         if (ACPI_FAILURE(status)) {
875                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
876                                   "Failed to acquire semaphore[%p|%d|%d], %s",
877                                   handle, units, timeout,
878                                   acpi_format_exception(status)));
879         } else {
880                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
881                                   "Acquired semaphore[%p|%d|%d]", handle,
882                                   units, timeout));
883         }
884
885         return status;
886 }
887
888 /*
889  * TODO: Support for units > 1?
890  */
891 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
892 {
893         struct semaphore *sem = (struct semaphore *)handle;
894
895         if (!sem || (units < 1))
896                 return AE_BAD_PARAMETER;
897
898         if (units > 1)
899                 return AE_SUPPORT;
900
901         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
902                           units));
903
904         up(sem);
905
906         return AE_OK;
907 }
908
909 #ifdef ACPI_FUTURE_USAGE
910 u32 acpi_os_get_line(char *buffer)
911 {
912
913 #ifdef ENABLE_DEBUGGER
914         if (acpi_in_debugger) {
915                 u32 chars;
916
917                 kdb_read(buffer, sizeof(line_buf));
918
919                 /* remove the CR kdb includes */
920                 chars = strlen(buffer) - 1;
921                 buffer[chars] = '\0';
922         }
923 #endif
924
925         return 0;
926 }
927 #endif                          /*  ACPI_FUTURE_USAGE  */
928
929 acpi_status acpi_os_signal(u32 function, void *info)
930 {
931         switch (function) {
932         case ACPI_SIGNAL_FATAL:
933                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
934                 break;
935         case ACPI_SIGNAL_BREAKPOINT:
936                 /*
937                  * AML Breakpoint
938                  * ACPI spec. says to treat it as a NOP unless
939                  * you are debugging.  So if/when we integrate
940                  * AML debugger into the kernel debugger its
941                  * hook will go here.  But until then it is
942                  * not useful to print anything on breakpoints.
943                  */
944                 break;
945         default:
946                 break;
947         }
948
949         return AE_OK;
950 }
951
952 static int __init acpi_os_name_setup(char *str)
953 {
954         char *p = acpi_os_name;
955         int count = ACPI_MAX_OVERRIDE_LEN - 1;
956
957         if (!str || !*str)
958                 return 0;
959
960         for (; count-- && str && *str; str++) {
961                 if (isalnum(*str) || *str == ' ' || *str == ':')
962                         *p++ = *str;
963                 else if (*str == '\'' || *str == '"')
964                         continue;
965                 else
966                         break;
967         }
968         *p = 0;
969
970         return 1;
971
972 }
973
974 __setup("acpi_os_name=", acpi_os_name_setup);
975
976 static void __init set_osi_linux(unsigned int enable)
977 {
978         if (osi_linux.enable != enable) {
979                 osi_linux.enable = enable;
980                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
981                         enable ? "Add": "Delet");
982         }
983         return;
984 }
985
986 static void __init acpi_cmdline_osi_linux(unsigned int enable)
987 {
988         osi_linux.cmdline = 1;  /* cmdline set the default */
989         set_osi_linux(enable);
990
991         return;
992 }
993
994 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
995 {
996         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
997
998         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
999
1000         if (enable == -1)
1001                 return;
1002
1003         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1004
1005         set_osi_linux(enable);
1006
1007         return;
1008 }
1009
1010 /*
1011  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1012  *
1013  * empty string disables _OSI
1014  * string starting with '!' disables that string
1015  * otherwise string is added to list, augmenting built-in strings
1016  */
1017 int __init acpi_osi_setup(char *str)
1018 {
1019         if (str == NULL || *str == '\0') {
1020                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1021                 acpi_gbl_create_osi_method = FALSE;
1022         } else if (!strcmp("!Linux", str)) {
1023                 acpi_cmdline_osi_linux(0);      /* !enable */
1024         } else if (*str == '!') {
1025                 if (acpi_osi_invalidate(++str) == AE_OK)
1026                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1027         } else if (!strcmp("Linux", str)) {
1028                 acpi_cmdline_osi_linux(1);      /* enable */
1029         } else if (*osi_additional_string == '\0') {
1030                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1031                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1032         }
1033
1034         return 1;
1035 }
1036
1037 __setup("acpi_osi=", acpi_osi_setup);
1038
1039 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1040 static int __init acpi_serialize_setup(char *str)
1041 {
1042         printk(KERN_INFO PREFIX "serialize enabled\n");
1043
1044         acpi_gbl_all_methods_serialized = TRUE;
1045
1046         return 1;
1047 }
1048
1049 __setup("acpi_serialize", acpi_serialize_setup);
1050
1051 /*
1052  * Wake and Run-Time GPES are expected to be separate.
1053  * We disable wake-GPEs at run-time to prevent spurious
1054  * interrupts.
1055  *
1056  * However, if a system exists that shares Wake and
1057  * Run-time events on the same GPE this flag is available
1058  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1059  */
1060 static int __init acpi_wake_gpes_always_on_setup(char *str)
1061 {
1062         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1063
1064         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1065
1066         return 1;
1067 }
1068
1069 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1070
1071 /* Check of resource interference between native drivers and ACPI
1072  * OperationRegions (SystemIO and System Memory only).
1073  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1074  * in arbitrary AML code and can interfere with legacy drivers.
1075  * acpi_enforce_resources= can be set to:
1076  *
1077  *   - strict           (2)
1078  *     -> further driver trying to access the resources will not load
1079  *   - lax (default)    (1)
1080  *     -> further driver trying to access the resources will load, but you
1081  *     get a system message that something might go wrong...
1082  *
1083  *   - no               (0)
1084  *     -> ACPI Operation Region resources will not be registered
1085  *
1086  */
1087 #define ENFORCE_RESOURCES_STRICT 2
1088 #define ENFORCE_RESOURCES_LAX    1
1089 #define ENFORCE_RESOURCES_NO     0
1090
1091 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1092
1093 static int __init acpi_enforce_resources_setup(char *str)
1094 {
1095         if (str == NULL || *str == '\0')
1096                 return 0;
1097
1098         if (!strcmp("strict", str))
1099                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1100         else if (!strcmp("lax", str))
1101                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1102         else if (!strcmp("no", str))
1103                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1104
1105         return 1;
1106 }
1107
1108 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1109
1110 /* Check for resource conflicts between ACPI OperationRegions and native
1111  * drivers */
1112 int acpi_check_resource_conflict(struct resource *res)
1113 {
1114         struct acpi_res_list *res_list_elem;
1115         int ioport;
1116         int clash = 0;
1117
1118         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1119                 return 0;
1120         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1121                 return 0;
1122
1123         ioport = res->flags & IORESOURCE_IO;
1124
1125         spin_lock(&acpi_res_lock);
1126         list_for_each_entry(res_list_elem, &resource_list_head,
1127                             resource_list) {
1128                 if (ioport && (res_list_elem->resource_type
1129                                != ACPI_ADR_SPACE_SYSTEM_IO))
1130                         continue;
1131                 if (!ioport && (res_list_elem->resource_type
1132                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1133                         continue;
1134
1135                 if (res->end < res_list_elem->start
1136                     || res_list_elem->end < res->start)
1137                         continue;
1138                 clash = 1;
1139                 break;
1140         }
1141         spin_unlock(&acpi_res_lock);
1142
1143         if (clash) {
1144                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1145                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1146                                " conflicts with ACPI region %s"
1147                                " [0x%llx-0x%llx]\n",
1148                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1149                                ? KERN_WARNING : KERN_ERR,
1150                                ioport ? "I/O" : "Memory", res->name,
1151                                (long long) res->start, (long long) res->end,
1152                                res_list_elem->name,
1153                                (long long) res_list_elem->start,
1154                                (long long) res_list_elem->end);
1155                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1156                 }
1157                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1158                         return -EBUSY;
1159         }
1160         return 0;
1161 }
1162 EXPORT_SYMBOL(acpi_check_resource_conflict);
1163
1164 int acpi_check_region(resource_size_t start, resource_size_t n,
1165                       const char *name)
1166 {
1167         struct resource res = {
1168                 .start = start,
1169                 .end   = start + n - 1,
1170                 .name  = name,
1171                 .flags = IORESOURCE_IO,
1172         };
1173
1174         return acpi_check_resource_conflict(&res);
1175 }
1176 EXPORT_SYMBOL(acpi_check_region);
1177
1178 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1179                       const char *name)
1180 {
1181         struct resource res = {
1182                 .start = start,
1183                 .end   = start + n - 1,
1184                 .name  = name,
1185                 .flags = IORESOURCE_MEM,
1186         };
1187
1188         return acpi_check_resource_conflict(&res);
1189
1190 }
1191 EXPORT_SYMBOL(acpi_check_mem_region);
1192
1193 /*
1194  * Acquire a spinlock.
1195  *
1196  * handle is a pointer to the spinlock_t.
1197  */
1198
1199 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1200 {
1201         acpi_cpu_flags flags;
1202         spin_lock_irqsave(lockp, flags);
1203         return flags;
1204 }
1205
1206 /*
1207  * Release a spinlock. See above.
1208  */
1209
1210 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1211 {
1212         spin_unlock_irqrestore(lockp, flags);
1213 }
1214
1215 #ifndef ACPI_USE_LOCAL_CACHE
1216
1217 /*******************************************************************************
1218  *
1219  * FUNCTION:    acpi_os_create_cache
1220  *
1221  * PARAMETERS:  name      - Ascii name for the cache
1222  *              size      - Size of each cached object
1223  *              depth     - Maximum depth of the cache (in objects) <ignored>
1224  *              cache     - Where the new cache object is returned
1225  *
1226  * RETURN:      status
1227  *
1228  * DESCRIPTION: Create a cache object
1229  *
1230  ******************************************************************************/
1231
1232 acpi_status
1233 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1234 {
1235         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1236         if (*cache == NULL)
1237                 return AE_ERROR;
1238         else
1239                 return AE_OK;
1240 }
1241
1242 /*******************************************************************************
1243  *
1244  * FUNCTION:    acpi_os_purge_cache
1245  *
1246  * PARAMETERS:  Cache           - Handle to cache object
1247  *
1248  * RETURN:      Status
1249  *
1250  * DESCRIPTION: Free all objects within the requested cache.
1251  *
1252  ******************************************************************************/
1253
1254 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1255 {
1256         kmem_cache_shrink(cache);
1257         return (AE_OK);
1258 }
1259
1260 /*******************************************************************************
1261  *
1262  * FUNCTION:    acpi_os_delete_cache
1263  *
1264  * PARAMETERS:  Cache           - Handle to cache object
1265  *
1266  * RETURN:      Status
1267  *
1268  * DESCRIPTION: Free all objects within the requested cache and delete the
1269  *              cache object.
1270  *
1271  ******************************************************************************/
1272
1273 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1274 {
1275         kmem_cache_destroy(cache);
1276         return (AE_OK);
1277 }
1278
1279 /*******************************************************************************
1280  *
1281  * FUNCTION:    acpi_os_release_object
1282  *
1283  * PARAMETERS:  Cache       - Handle to cache object
1284  *              Object      - The object to be released
1285  *
1286  * RETURN:      None
1287  *
1288  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1289  *              the object is deleted.
1290  *
1291  ******************************************************************************/
1292
1293 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1294 {
1295         kmem_cache_free(cache, object);
1296         return (AE_OK);
1297 }
1298
1299 /**
1300  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1301  *
1302  *      Returns 0 on success
1303  */
1304 static int acpi_dmi_dump(void)
1305 {
1306
1307         if (!dmi_available)
1308                 return -1;
1309
1310         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1311                 dmi_get_system_info(DMI_SYS_VENDOR));
1312         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1313                 dmi_get_system_info(DMI_PRODUCT_NAME));
1314         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1315                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1316         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1317                 dmi_get_system_info(DMI_BOARD_NAME));
1318         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1319                 dmi_get_system_info(DMI_BIOS_VENDOR));
1320         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1321                 dmi_get_system_info(DMI_BIOS_DATE));
1322
1323         return 0;
1324 }
1325
1326
1327 /******************************************************************************
1328  *
1329  * FUNCTION:    acpi_os_validate_interface
1330  *
1331  * PARAMETERS:  interface           - Requested interface to be validated
1332  *
1333  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1334  *
1335  * DESCRIPTION: Match an interface string to the interfaces supported by the
1336  *              host. Strings originate from an AML call to the _OSI method.
1337  *
1338  *****************************************************************************/
1339
1340 acpi_status
1341 acpi_os_validate_interface (char *interface)
1342 {
1343         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1344                 return AE_OK;
1345         if (!strcmp("Linux", interface)) {
1346
1347                 printk(KERN_NOTICE PREFIX
1348                         "BIOS _OSI(Linux) query %s%s\n",
1349                         osi_linux.enable ? "honored" : "ignored",
1350                         osi_linux.cmdline ? " via cmdline" :
1351                         osi_linux.dmi ? " via DMI" : "");
1352
1353                 if (!osi_linux.dmi) {
1354                         if (acpi_dmi_dump())
1355                                 printk(KERN_NOTICE PREFIX
1356                                         "[please extract dmidecode output]\n");
1357                         printk(KERN_NOTICE PREFIX
1358                                 "Please send DMI info above to "
1359                                 "linux-acpi@vger.kernel.org\n");
1360                 }
1361                 if (!osi_linux.known && !osi_linux.cmdline) {
1362                         printk(KERN_NOTICE PREFIX
1363                                 "If \"acpi_osi=%sLinux\" works better, "
1364                                 "please notify linux-acpi@vger.kernel.org\n",
1365                                 osi_linux.enable ? "!" : "");
1366                 }
1367
1368                 if (osi_linux.enable)
1369                         return AE_OK;
1370         }
1371         return AE_SUPPORT;
1372 }
1373
1374 /******************************************************************************
1375  *
1376  * FUNCTION:    acpi_os_validate_address
1377  *
1378  * PARAMETERS:  space_id             - ACPI space ID
1379  *              address             - Physical address
1380  *              length              - Address length
1381  *
1382  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1383  *              should return AE_AML_ILLEGAL_ADDRESS.
1384  *
1385  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1386  *              the addresses accessed by AML operation regions.
1387  *
1388  *****************************************************************************/
1389
1390 acpi_status
1391 acpi_os_validate_address (
1392     u8                   space_id,
1393     acpi_physical_address   address,
1394     acpi_size               length,
1395     char *name)
1396 {
1397         struct acpi_res_list *res;
1398         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1399                 return AE_OK;
1400
1401         switch (space_id) {
1402         case ACPI_ADR_SPACE_SYSTEM_IO:
1403         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1404                 /* Only interference checks against SystemIO and SytemMemory
1405                    are needed */
1406                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1407                 if (!res)
1408                         return AE_OK;
1409                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1410                 strlcpy(res->name, name, 5);
1411                 res->start = address;
1412                 res->end = address + length - 1;
1413                 res->resource_type = space_id;
1414                 spin_lock(&acpi_res_lock);
1415                 list_add(&res->resource_list, &resource_list_head);
1416                 spin_unlock(&acpi_res_lock);
1417                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1418                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1419                          ? "SystemIO" : "System Memory",
1420                          (unsigned long long)res->start,
1421                          (unsigned long long)res->end,
1422                          res->name);
1423                 break;
1424         case ACPI_ADR_SPACE_PCI_CONFIG:
1425         case ACPI_ADR_SPACE_EC:
1426         case ACPI_ADR_SPACE_SMBUS:
1427         case ACPI_ADR_SPACE_CMOS:
1428         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1429         case ACPI_ADR_SPACE_DATA_TABLE:
1430         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1431                 break;
1432         }
1433         return AE_OK;
1434 }
1435
1436 #endif