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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/highmem.h>
35#include <linux/pci.h>
36#include <linux/interrupt.h>
37#include <linux/kmod.h>
38#include <linux/delay.h>
39#include <linux/workqueue.h>
40#include <linux/nmi.h>
41#include <linux/acpi.h>
42#include <linux/acpi_io.h>
43#include <linux/efi.h>
44#include <linux/ioport.h>
45#include <linux/list.h>
46#include <linux/jiffies.h>
47#include <linux/semaphore.h>
48
49#include <asm/io.h>
50#include <asm/uaccess.h>
51
52#include <acpi/acpi.h>
53#include <acpi/acpi_bus.h>
54#include <acpi/processor.h>
55
56#define _COMPONENT ACPI_OS_SERVICES
57ACPI_MODULE_NAME("osl");
58#define PREFIX "ACPI: "
59struct acpi_os_dpc {
60 acpi_osd_exec_callback function;
61 void *context;
62 struct work_struct work;
63 int wait;
64};
65
66#ifdef CONFIG_ACPI_CUSTOM_DSDT
67#include CONFIG_ACPI_CUSTOM_DSDT_FILE
68#endif
69
70#ifdef ENABLE_DEBUGGER
71#include <linux/kdb.h>
72
73/* stuff for debugger support */
74int acpi_in_debugger;
75EXPORT_SYMBOL(acpi_in_debugger);
76
77extern char line_buf[80];
78#endif /*ENABLE_DEBUGGER */
79
80static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81 u32 pm1b_ctrl);
82
83static acpi_osd_handler acpi_irq_handler;
84static void *acpi_irq_context;
85static struct workqueue_struct *kacpid_wq;
86static struct workqueue_struct *kacpi_notify_wq;
87struct workqueue_struct *kacpi_hotplug_wq;
88EXPORT_SYMBOL(kacpi_hotplug_wq);
89
90/*
91 * This list of permanent mappings is for memory that may be accessed from
92 * interrupt context, where we can't do the ioremap().
93 */
94struct acpi_ioremap {
95 struct list_head list;
96 void __iomem *virt;
97 acpi_physical_address phys;
98 acpi_size size;
99 unsigned long refcount;
100};
101
102static LIST_HEAD(acpi_ioremaps);
103static DEFINE_MUTEX(acpi_ioremap_lock);
104
105static void __init acpi_osi_setup_late(void);
106
107/*
108 * The story of _OSI(Linux)
109 *
110 * From pre-history through Linux-2.6.22,
111 * Linux responded TRUE upon a BIOS OSI(Linux) query.
112 *
113 * Unfortunately, reference BIOS writers got wind of this
114 * and put OSI(Linux) in their example code, quickly exposing
115 * this string as ill-conceived and opening the door to
116 * an un-bounded number of BIOS incompatibilities.
117 *
118 * For example, OSI(Linux) was used on resume to re-POST a
119 * video card on one system, because Linux at that time
120 * could not do a speedy restore in its native driver.
121 * But then upon gaining quick native restore capability,
122 * Linux has no way to tell the BIOS to skip the time-consuming
123 * POST -- putting Linux at a permanent performance disadvantage.
124 * On another system, the BIOS writer used OSI(Linux)
125 * to infer native OS support for IPMI! On other systems,
126 * OSI(Linux) simply got in the way of Linux claiming to
127 * be compatible with other operating systems, exposing
128 * BIOS issues such as skipped device initialization.
129 *
130 * So "Linux" turned out to be a really poor chose of
131 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132 *
133 * BIOS writers should NOT query _OSI(Linux) on future systems.
134 * Linux will complain on the console when it sees it, and return FALSE.
135 * To get Linux to return TRUE for your system will require
136 * a kernel source update to add a DMI entry,
137 * or boot with "acpi_osi=Linux"
138 */
139
140static struct osi_linux {
141 unsigned int enable:1;
142 unsigned int dmi:1;
143 unsigned int cmdline:1;
144} osi_linux = {0, 0, 0};
145
146static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147{
148 if (!strcmp("Linux", interface)) {
149
150 printk_once(KERN_NOTICE FW_BUG PREFIX
151 "BIOS _OSI(Linux) query %s%s\n",
152 osi_linux.enable ? "honored" : "ignored",
153 osi_linux.cmdline ? " via cmdline" :
154 osi_linux.dmi ? " via DMI" : "");
155 }
156
157 return supported;
158}
159
160static void __init acpi_request_region (struct acpi_generic_address *gas,
161 unsigned int length, char *desc)
162{
163 u64 addr;
164
165 /* Handle possible alignment issues */
166 memcpy(&addr, &gas->address, sizeof(addr));
167 if (!addr || !length)
168 return;
169
170 /* Resources are never freed */
171 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
172 request_region(addr, length, desc);
173 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
174 request_mem_region(addr, length, desc);
175}
176
177static int __init acpi_reserve_resources(void)
178{
179 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
180 "ACPI PM1a_EVT_BLK");
181
182 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
183 "ACPI PM1b_EVT_BLK");
184
185 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
186 "ACPI PM1a_CNT_BLK");
187
188 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
189 "ACPI PM1b_CNT_BLK");
190
191 if (acpi_gbl_FADT.pm_timer_length == 4)
192 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193
194 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
195 "ACPI PM2_CNT_BLK");
196
197 /* Length of GPE blocks must be a non-negative multiple of 2 */
198
199 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
200 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
201 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202
203 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
204 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
205 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206
207 return 0;
208}
209device_initcall(acpi_reserve_resources);
210
211void acpi_os_printf(const char *fmt, ...)
212{
213 va_list args;
214 va_start(args, fmt);
215 acpi_os_vprintf(fmt, args);
216 va_end(args);
217}
218
219void acpi_os_vprintf(const char *fmt, va_list args)
220{
221 static char buffer[512];
222
223 vsprintf(buffer, fmt, args);
224
225#ifdef ENABLE_DEBUGGER
226 if (acpi_in_debugger) {
227 kdb_printf("%s", buffer);
228 } else {
229 printk(KERN_CONT "%s", buffer);
230 }
231#else
232 printk(KERN_CONT "%s", buffer);
233#endif
234}
235
236#ifdef CONFIG_KEXEC
237static unsigned long acpi_rsdp;
238static int __init setup_acpi_rsdp(char *arg)
239{
240 acpi_rsdp = simple_strtoul(arg, NULL, 16);
241 return 0;
242}
243early_param("acpi_rsdp", setup_acpi_rsdp);
244#endif
245
246acpi_physical_address __init acpi_os_get_root_pointer(void)
247{
248#ifdef CONFIG_KEXEC
249 if (acpi_rsdp)
250 return acpi_rsdp;
251#endif
252
253 if (efi_enabled) {
254 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
255 return efi.acpi20;
256 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
257 return efi.acpi;
258 else {
259 printk(KERN_ERR PREFIX
260 "System description tables not found\n");
261 return 0;
262 }
263 } else {
264 acpi_physical_address pa = 0;
265
266 acpi_find_root_pointer(&pa);
267 return pa;
268 }
269}
270
271/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272static struct acpi_ioremap *
273acpi_map_lookup(acpi_physical_address phys, acpi_size size)
274{
275 struct acpi_ioremap *map;
276
277 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
278 if (map->phys <= phys &&
279 phys + size <= map->phys + map->size)
280 return map;
281
282 return NULL;
283}
284
285/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286static void __iomem *
287acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
288{
289 struct acpi_ioremap *map;
290
291 map = acpi_map_lookup(phys, size);
292 if (map)
293 return map->virt + (phys - map->phys);
294
295 return NULL;
296}
297
298void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
299{
300 struct acpi_ioremap *map;
301 void __iomem *virt = NULL;
302
303 mutex_lock(&acpi_ioremap_lock);
304 map = acpi_map_lookup(phys, size);
305 if (map) {
306 virt = map->virt + (phys - map->phys);
307 map->refcount++;
308 }
309 mutex_unlock(&acpi_ioremap_lock);
310 return virt;
311}
312EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
313
314/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315static struct acpi_ioremap *
316acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
317{
318 struct acpi_ioremap *map;
319
320 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
321 if (map->virt <= virt &&
322 virt + size <= map->virt + map->size)
323 return map;
324
325 return NULL;
326}
327
328#ifndef CONFIG_IA64
329#define should_use_kmap(pfn) page_is_ram(pfn)
330#else
331/* ioremap will take care of cache attributes */
332#define should_use_kmap(pfn) 0
333#endif
334
335static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336{
337 unsigned long pfn;
338
339 pfn = pg_off >> PAGE_SHIFT;
340 if (should_use_kmap(pfn)) {
341 if (pg_sz > PAGE_SIZE)
342 return NULL;
343 return (void __iomem __force *)kmap(pfn_to_page(pfn));
344 } else
345 return acpi_os_ioremap(pg_off, pg_sz);
346}
347
348static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349{
350 unsigned long pfn;
351
352 pfn = pg_off >> PAGE_SHIFT;
353 if (should_use_kmap(pfn))
354 kunmap(pfn_to_page(pfn));
355 else
356 iounmap(vaddr);
357}
358
359void __iomem *__init_refok
360acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
361{
362 struct acpi_ioremap *map;
363 void __iomem *virt;
364 acpi_physical_address pg_off;
365 acpi_size pg_sz;
366
367 if (phys > ULONG_MAX) {
368 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369 return NULL;
370 }
371
372 if (!acpi_gbl_permanent_mmap)
373 return __acpi_map_table((unsigned long)phys, size);
374
375 mutex_lock(&acpi_ioremap_lock);
376 /* Check if there's a suitable mapping already. */
377 map = acpi_map_lookup(phys, size);
378 if (map) {
379 map->refcount++;
380 goto out;
381 }
382
383 map = kzalloc(sizeof(*map), GFP_KERNEL);
384 if (!map) {
385 mutex_unlock(&acpi_ioremap_lock);
386 return NULL;
387 }
388
389 pg_off = round_down(phys, PAGE_SIZE);
390 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
391 virt = acpi_map(pg_off, pg_sz);
392 if (!virt) {
393 mutex_unlock(&acpi_ioremap_lock);
394 kfree(map);
395 return NULL;
396 }
397
398 INIT_LIST_HEAD(&map->list);
399 map->virt = virt;
400 map->phys = pg_off;
401 map->size = pg_sz;
402 map->refcount = 1;
403
404 list_add_tail_rcu(&map->list, &acpi_ioremaps);
405
406 out:
407 mutex_unlock(&acpi_ioremap_lock);
408 return map->virt + (phys - map->phys);
409}
410EXPORT_SYMBOL_GPL(acpi_os_map_memory);
411
412static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
413{
414 if (!--map->refcount)
415 list_del_rcu(&map->list);
416}
417
418static void acpi_os_map_cleanup(struct acpi_ioremap *map)
419{
420 if (!map->refcount) {
421 synchronize_rcu();
422 acpi_unmap(map->phys, map->virt);
423 kfree(map);
424 }
425}
426
427void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
428{
429 struct acpi_ioremap *map;
430
431 if (!acpi_gbl_permanent_mmap) {
432 __acpi_unmap_table(virt, size);
433 return;
434 }
435
436 mutex_lock(&acpi_ioremap_lock);
437 map = acpi_map_lookup_virt(virt, size);
438 if (!map) {
439 mutex_unlock(&acpi_ioremap_lock);
440 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
441 return;
442 }
443 acpi_os_drop_map_ref(map);
444 mutex_unlock(&acpi_ioremap_lock);
445
446 acpi_os_map_cleanup(map);
447}
448EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
451{
452 if (!acpi_gbl_permanent_mmap)
453 __acpi_unmap_table(virt, size);
454}
455
456int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457{
458 u64 addr;
459 void __iomem *virt;
460
461 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462 return 0;
463
464 /* Handle possible alignment issues */
465 memcpy(&addr, &gas->address, sizeof(addr));
466 if (!addr || !gas->bit_width)
467 return -EINVAL;
468
469 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
470 if (!virt)
471 return -EIO;
472
473 return 0;
474}
475EXPORT_SYMBOL(acpi_os_map_generic_address);
476
477void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
478{
479 u64 addr;
480 struct acpi_ioremap *map;
481
482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 return;
484
485 /* Handle possible alignment issues */
486 memcpy(&addr, &gas->address, sizeof(addr));
487 if (!addr || !gas->bit_width)
488 return;
489
490 mutex_lock(&acpi_ioremap_lock);
491 map = acpi_map_lookup(addr, gas->bit_width / 8);
492 if (!map) {
493 mutex_unlock(&acpi_ioremap_lock);
494 return;
495 }
496 acpi_os_drop_map_ref(map);
497 mutex_unlock(&acpi_ioremap_lock);
498
499 acpi_os_map_cleanup(map);
500}
501EXPORT_SYMBOL(acpi_os_unmap_generic_address);
502
503#ifdef ACPI_FUTURE_USAGE
504acpi_status
505acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
506{
507 if (!phys || !virt)
508 return AE_BAD_PARAMETER;
509
510 *phys = virt_to_phys(virt);
511
512 return AE_OK;
513}
514#endif
515
516#define ACPI_MAX_OVERRIDE_LEN 100
517
518static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519
520acpi_status
521acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
522 acpi_string * new_val)
523{
524 if (!init_val || !new_val)
525 return AE_BAD_PARAMETER;
526
527 *new_val = NULL;
528 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
529 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
530 acpi_os_name);
531 *new_val = acpi_os_name;
532 }
533
534 return AE_OK;
535}
536
537acpi_status
538acpi_os_table_override(struct acpi_table_header * existing_table,
539 struct acpi_table_header ** new_table)
540{
541 if (!existing_table || !new_table)
542 return AE_BAD_PARAMETER;
543
544 *new_table = NULL;
545
546#ifdef CONFIG_ACPI_CUSTOM_DSDT
547 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
548 *new_table = (struct acpi_table_header *)AmlCode;
549#endif
550 if (*new_table != NULL) {
551 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
552 "this is unsafe: tainting kernel\n",
553 existing_table->signature,
554 existing_table->oem_table_id);
555 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
556 }
557 return AE_OK;
558}
559
560acpi_status
561acpi_os_physical_table_override(struct acpi_table_header *existing_table,
562 acpi_physical_address * new_address,
563 u32 *new_table_length)
564{
565 return AE_SUPPORT;
566}
567
568
569static irqreturn_t acpi_irq(int irq, void *dev_id)
570{
571 u32 handled;
572
573 handled = (*acpi_irq_handler) (acpi_irq_context);
574
575 if (handled) {
576 acpi_irq_handled++;
577 return IRQ_HANDLED;
578 } else {
579 acpi_irq_not_handled++;
580 return IRQ_NONE;
581 }
582}
583
584acpi_status
585acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
586 void *context)
587{
588 unsigned int irq;
589
590 acpi_irq_stats_init();
591
592 /*
593 * ACPI interrupts different from the SCI in our copy of the FADT are
594 * not supported.
595 */
596 if (gsi != acpi_gbl_FADT.sci_interrupt)
597 return AE_BAD_PARAMETER;
598
599 if (acpi_irq_handler)
600 return AE_ALREADY_ACQUIRED;
601
602 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
603 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
604 gsi);
605 return AE_OK;
606 }
607
608 acpi_irq_handler = handler;
609 acpi_irq_context = context;
610 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
611 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
612 acpi_irq_handler = NULL;
613 return AE_NOT_ACQUIRED;
614 }
615
616 return AE_OK;
617}
618
619acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
620{
621 if (irq != acpi_gbl_FADT.sci_interrupt)
622 return AE_BAD_PARAMETER;
623
624 free_irq(irq, acpi_irq);
625 acpi_irq_handler = NULL;
626
627 return AE_OK;
628}
629
630/*
631 * Running in interpreter thread context, safe to sleep
632 */
633
634void acpi_os_sleep(u64 ms)
635{
636 schedule_timeout_interruptible(msecs_to_jiffies(ms));
637}
638
639void acpi_os_stall(u32 us)
640{
641 while (us) {
642 u32 delay = 1000;
643
644 if (delay > us)
645 delay = us;
646 udelay(delay);
647 touch_nmi_watchdog();
648 us -= delay;
649 }
650}
651
652/*
653 * Support ACPI 3.0 AML Timer operand
654 * Returns 64-bit free-running, monotonically increasing timer
655 * with 100ns granularity
656 */
657u64 acpi_os_get_timer(void)
658{
659 static u64 t;
660
661#ifdef CONFIG_HPET
662 /* TBD: use HPET if available */
663#endif
664
665#ifdef CONFIG_X86_PM_TIMER
666 /* TBD: default to PM timer if HPET was not available */
667#endif
668 if (!t)
669 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
670
671 return ++t;
672}
673
674acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
675{
676 u32 dummy;
677
678 if (!value)
679 value = &dummy;
680
681 *value = 0;
682 if (width <= 8) {
683 *(u8 *) value = inb(port);
684 } else if (width <= 16) {
685 *(u16 *) value = inw(port);
686 } else if (width <= 32) {
687 *(u32 *) value = inl(port);
688 } else {
689 BUG();
690 }
691
692 return AE_OK;
693}
694
695EXPORT_SYMBOL(acpi_os_read_port);
696
697acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
698{
699 if (width <= 8) {
700 outb(value, port);
701 } else if (width <= 16) {
702 outw(value, port);
703 } else if (width <= 32) {
704 outl(value, port);
705 } else {
706 BUG();
707 }
708
709 return AE_OK;
710}
711
712EXPORT_SYMBOL(acpi_os_write_port);
713
714#ifdef readq
715static inline u64 read64(const volatile void __iomem *addr)
716{
717 return readq(addr);
718}
719#else
720static inline u64 read64(const volatile void __iomem *addr)
721{
722 u64 l, h;
723 l = readl(addr);
724 h = readl(addr+4);
725 return l | (h << 32);
726}
727#endif
728
729acpi_status
730acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
731{
732 void __iomem *virt_addr;
733 unsigned int size = width / 8;
734 bool unmap = false;
735 u64 dummy;
736
737 rcu_read_lock();
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
739 if (!virt_addr) {
740 rcu_read_unlock();
741 virt_addr = acpi_os_ioremap(phys_addr, size);
742 if (!virt_addr)
743 return AE_BAD_ADDRESS;
744 unmap = true;
745 }
746
747 if (!value)
748 value = &dummy;
749
750 switch (width) {
751 case 8:
752 *(u8 *) value = readb(virt_addr);
753 break;
754 case 16:
755 *(u16 *) value = readw(virt_addr);
756 break;
757 case 32:
758 *(u32 *) value = readl(virt_addr);
759 break;
760 case 64:
761 *(u64 *) value = read64(virt_addr);
762 break;
763 default:
764 BUG();
765 }
766
767 if (unmap)
768 iounmap(virt_addr);
769 else
770 rcu_read_unlock();
771
772 return AE_OK;
773}
774
775#ifdef writeq
776static inline void write64(u64 val, volatile void __iomem *addr)
777{
778 writeq(val, addr);
779}
780#else
781static inline void write64(u64 val, volatile void __iomem *addr)
782{
783 writel(val, addr);
784 writel(val>>32, addr+4);
785}
786#endif
787
788acpi_status
789acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
790{
791 void __iomem *virt_addr;
792 unsigned int size = width / 8;
793 bool unmap = false;
794
795 rcu_read_lock();
796 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
797 if (!virt_addr) {
798 rcu_read_unlock();
799 virt_addr = acpi_os_ioremap(phys_addr, size);
800 if (!virt_addr)
801 return AE_BAD_ADDRESS;
802 unmap = true;
803 }
804
805 switch (width) {
806 case 8:
807 writeb(value, virt_addr);
808 break;
809 case 16:
810 writew(value, virt_addr);
811 break;
812 case 32:
813 writel(value, virt_addr);
814 break;
815 case 64:
816 write64(value, virt_addr);
817 break;
818 default:
819 BUG();
820 }
821
822 if (unmap)
823 iounmap(virt_addr);
824 else
825 rcu_read_unlock();
826
827 return AE_OK;
828}
829
830acpi_status
831acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
832 u64 *value, u32 width)
833{
834 int result, size;
835 u32 value32;
836
837 if (!value)
838 return AE_BAD_PARAMETER;
839
840 switch (width) {
841 case 8:
842 size = 1;
843 break;
844 case 16:
845 size = 2;
846 break;
847 case 32:
848 size = 4;
849 break;
850 default:
851 return AE_ERROR;
852 }
853
854 result = raw_pci_read(pci_id->segment, pci_id->bus,
855 PCI_DEVFN(pci_id->device, pci_id->function),
856 reg, size, &value32);
857 *value = value32;
858
859 return (result ? AE_ERROR : AE_OK);
860}
861
862acpi_status
863acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
864 u64 value, u32 width)
865{
866 int result, size;
867
868 switch (width) {
869 case 8:
870 size = 1;
871 break;
872 case 16:
873 size = 2;
874 break;
875 case 32:
876 size = 4;
877 break;
878 default:
879 return AE_ERROR;
880 }
881
882 result = raw_pci_write(pci_id->segment, pci_id->bus,
883 PCI_DEVFN(pci_id->device, pci_id->function),
884 reg, size, value);
885
886 return (result ? AE_ERROR : AE_OK);
887}
888
889static void acpi_os_execute_deferred(struct work_struct *work)
890{
891 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
892
893 if (dpc->wait)
894 acpi_os_wait_events_complete(NULL);
895
896 dpc->function(dpc->context);
897 kfree(dpc);
898}
899
900/*******************************************************************************
901 *
902 * FUNCTION: acpi_os_execute
903 *
904 * PARAMETERS: Type - Type of the callback
905 * Function - Function to be executed
906 * Context - Function parameters
907 *
908 * RETURN: Status
909 *
910 * DESCRIPTION: Depending on type, either queues function for deferred execution or
911 * immediately executes function on a separate thread.
912 *
913 ******************************************************************************/
914
915static acpi_status __acpi_os_execute(acpi_execute_type type,
916 acpi_osd_exec_callback function, void *context, int hp)
917{
918 acpi_status status = AE_OK;
919 struct acpi_os_dpc *dpc;
920 struct workqueue_struct *queue;
921 int ret;
922 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
923 "Scheduling function [%p(%p)] for deferred execution.\n",
924 function, context));
925
926 /*
927 * Allocate/initialize DPC structure. Note that this memory will be
928 * freed by the callee. The kernel handles the work_struct list in a
929 * way that allows us to also free its memory inside the callee.
930 * Because we may want to schedule several tasks with different
931 * parameters we can't use the approach some kernel code uses of
932 * having a static work_struct.
933 */
934
935 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
936 if (!dpc)
937 return AE_NO_MEMORY;
938
939 dpc->function = function;
940 dpc->context = context;
941
942 /*
943 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
944 * because the hotplug code may call driver .remove() functions,
945 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
946 * to flush these workqueues.
947 */
948 queue = hp ? kacpi_hotplug_wq :
949 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
950 dpc->wait = hp ? 1 : 0;
951
952 if (queue == kacpi_hotplug_wq)
953 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
954 else if (queue == kacpi_notify_wq)
955 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
956 else
957 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
958
959 /*
960 * On some machines, a software-initiated SMI causes corruption unless
961 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
962 * typically it's done in GPE-related methods that are run via
963 * workqueues, so we can avoid the known corruption cases by always
964 * queueing on CPU 0.
965 */
966 ret = queue_work_on(0, queue, &dpc->work);
967
968 if (!ret) {
969 printk(KERN_ERR PREFIX
970 "Call to queue_work() failed.\n");
971 status = AE_ERROR;
972 kfree(dpc);
973 }
974 return status;
975}
976
977acpi_status acpi_os_execute(acpi_execute_type type,
978 acpi_osd_exec_callback function, void *context)
979{
980 return __acpi_os_execute(type, function, context, 0);
981}
982EXPORT_SYMBOL(acpi_os_execute);
983
984acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
985 void *context)
986{
987 return __acpi_os_execute(0, function, context, 1);
988}
989
990void acpi_os_wait_events_complete(void *context)
991{
992 flush_workqueue(kacpid_wq);
993 flush_workqueue(kacpi_notify_wq);
994}
995
996EXPORT_SYMBOL(acpi_os_wait_events_complete);
997
998acpi_status
999acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1000{
1001 struct semaphore *sem = NULL;
1002
1003 sem = acpi_os_allocate(sizeof(struct semaphore));
1004 if (!sem)
1005 return AE_NO_MEMORY;
1006 memset(sem, 0, sizeof(struct semaphore));
1007
1008 sema_init(sem, initial_units);
1009
1010 *handle = (acpi_handle *) sem;
1011
1012 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1013 *handle, initial_units));
1014
1015 return AE_OK;
1016}
1017
1018/*
1019 * TODO: A better way to delete semaphores? Linux doesn't have a
1020 * 'delete_semaphore()' function -- may result in an invalid
1021 * pointer dereference for non-synchronized consumers. Should
1022 * we at least check for blocked threads and signal/cancel them?
1023 */
1024
1025acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1026{
1027 struct semaphore *sem = (struct semaphore *)handle;
1028
1029 if (!sem)
1030 return AE_BAD_PARAMETER;
1031
1032 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1033
1034 BUG_ON(!list_empty(&sem->wait_list));
1035 kfree(sem);
1036 sem = NULL;
1037
1038 return AE_OK;
1039}
1040
1041/*
1042 * TODO: Support for units > 1?
1043 */
1044acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1045{
1046 acpi_status status = AE_OK;
1047 struct semaphore *sem = (struct semaphore *)handle;
1048 long jiffies;
1049 int ret = 0;
1050
1051 if (!sem || (units < 1))
1052 return AE_BAD_PARAMETER;
1053
1054 if (units > 1)
1055 return AE_SUPPORT;
1056
1057 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1058 handle, units, timeout));
1059
1060 if (timeout == ACPI_WAIT_FOREVER)
1061 jiffies = MAX_SCHEDULE_TIMEOUT;
1062 else
1063 jiffies = msecs_to_jiffies(timeout);
1064
1065 ret = down_timeout(sem, jiffies);
1066 if (ret)
1067 status = AE_TIME;
1068
1069 if (ACPI_FAILURE(status)) {
1070 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1071 "Failed to acquire semaphore[%p|%d|%d], %s",
1072 handle, units, timeout,
1073 acpi_format_exception(status)));
1074 } else {
1075 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1076 "Acquired semaphore[%p|%d|%d]", handle,
1077 units, timeout));
1078 }
1079
1080 return status;
1081}
1082
1083/*
1084 * TODO: Support for units > 1?
1085 */
1086acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1087{
1088 struct semaphore *sem = (struct semaphore *)handle;
1089
1090 if (!sem || (units < 1))
1091 return AE_BAD_PARAMETER;
1092
1093 if (units > 1)
1094 return AE_SUPPORT;
1095
1096 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1097 units));
1098
1099 up(sem);
1100
1101 return AE_OK;
1102}
1103
1104#ifdef ACPI_FUTURE_USAGE
1105u32 acpi_os_get_line(char *buffer)
1106{
1107
1108#ifdef ENABLE_DEBUGGER
1109 if (acpi_in_debugger) {
1110 u32 chars;
1111
1112 kdb_read(buffer, sizeof(line_buf));
1113
1114 /* remove the CR kdb includes */
1115 chars = strlen(buffer) - 1;
1116 buffer[chars] = '\0';
1117 }
1118#endif
1119
1120 return 0;
1121}
1122#endif /* ACPI_FUTURE_USAGE */
1123
1124acpi_status acpi_os_signal(u32 function, void *info)
1125{
1126 switch (function) {
1127 case ACPI_SIGNAL_FATAL:
1128 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1129 break;
1130 case ACPI_SIGNAL_BREAKPOINT:
1131 /*
1132 * AML Breakpoint
1133 * ACPI spec. says to treat it as a NOP unless
1134 * you are debugging. So if/when we integrate
1135 * AML debugger into the kernel debugger its
1136 * hook will go here. But until then it is
1137 * not useful to print anything on breakpoints.
1138 */
1139 break;
1140 default:
1141 break;
1142 }
1143
1144 return AE_OK;
1145}
1146
1147static int __init acpi_os_name_setup(char *str)
1148{
1149 char *p = acpi_os_name;
1150 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1151
1152 if (!str || !*str)
1153 return 0;
1154
1155 for (; count-- && str && *str; str++) {
1156 if (isalnum(*str) || *str == ' ' || *str == ':')
1157 *p++ = *str;
1158 else if (*str == '\'' || *str == '"')
1159 continue;
1160 else
1161 break;
1162 }
1163 *p = 0;
1164
1165 return 1;
1166
1167}
1168
1169__setup("acpi_os_name=", acpi_os_name_setup);
1170
1171#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1172#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1173
1174struct osi_setup_entry {
1175 char string[OSI_STRING_LENGTH_MAX];
1176 bool enable;
1177};
1178
1179static struct osi_setup_entry __initdata
1180 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1181 {"Module Device", true},
1182 {"Processor Device", true},
1183 {"3.0 _SCP Extensions", true},
1184 {"Processor Aggregator Device", true},
1185};
1186
1187void __init acpi_osi_setup(char *str)
1188{
1189 struct osi_setup_entry *osi;
1190 bool enable = true;
1191 int i;
1192
1193 if (!acpi_gbl_create_osi_method)
1194 return;
1195
1196 if (str == NULL || *str == '\0') {
1197 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1198 acpi_gbl_create_osi_method = FALSE;
1199 return;
1200 }
1201
1202 if (*str == '!') {
1203 str++;
1204 enable = false;
1205 }
1206
1207 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1208 osi = &osi_setup_entries[i];
1209 if (!strcmp(osi->string, str)) {
1210 osi->enable = enable;
1211 break;
1212 } else if (osi->string[0] == '\0') {
1213 osi->enable = enable;
1214 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1215 break;
1216 }
1217 }
1218}
1219
1220static void __init set_osi_linux(unsigned int enable)
1221{
1222 if (osi_linux.enable != enable)
1223 osi_linux.enable = enable;
1224
1225 if (osi_linux.enable)
1226 acpi_osi_setup("Linux");
1227 else
1228 acpi_osi_setup("!Linux");
1229
1230 return;
1231}
1232
1233static void __init acpi_cmdline_osi_linux(unsigned int enable)
1234{
1235 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1236 osi_linux.dmi = 0;
1237 set_osi_linux(enable);
1238
1239 return;
1240}
1241
1242void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1243{
1244 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1245
1246 if (enable == -1)
1247 return;
1248
1249 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1250 set_osi_linux(enable);
1251
1252 return;
1253}
1254
1255/*
1256 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1257 *
1258 * empty string disables _OSI
1259 * string starting with '!' disables that string
1260 * otherwise string is added to list, augmenting built-in strings
1261 */
1262static void __init acpi_osi_setup_late(void)
1263{
1264 struct osi_setup_entry *osi;
1265 char *str;
1266 int i;
1267 acpi_status status;
1268
1269 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1270 osi = &osi_setup_entries[i];
1271 str = osi->string;
1272
1273 if (*str == '\0')
1274 break;
1275 if (osi->enable) {
1276 status = acpi_install_interface(str);
1277
1278 if (ACPI_SUCCESS(status))
1279 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1280 } else {
1281 status = acpi_remove_interface(str);
1282
1283 if (ACPI_SUCCESS(status))
1284 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1285 }
1286 }
1287}
1288
1289static int __init osi_setup(char *str)
1290{
1291 if (str && !strcmp("Linux", str))
1292 acpi_cmdline_osi_linux(1);
1293 else if (str && !strcmp("!Linux", str))
1294 acpi_cmdline_osi_linux(0);
1295 else
1296 acpi_osi_setup(str);
1297
1298 return 1;
1299}
1300
1301__setup("acpi_osi=", osi_setup);
1302
1303/* enable serialization to combat AE_ALREADY_EXISTS errors */
1304static int __init acpi_serialize_setup(char *str)
1305{
1306 printk(KERN_INFO PREFIX "serialize enabled\n");
1307
1308 acpi_gbl_all_methods_serialized = TRUE;
1309
1310 return 1;
1311}
1312
1313__setup("acpi_serialize", acpi_serialize_setup);
1314
1315/* Check of resource interference between native drivers and ACPI
1316 * OperationRegions (SystemIO and System Memory only).
1317 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1318 * in arbitrary AML code and can interfere with legacy drivers.
1319 * acpi_enforce_resources= can be set to:
1320 *
1321 * - strict (default) (2)
1322 * -> further driver trying to access the resources will not load
1323 * - lax (1)
1324 * -> further driver trying to access the resources will load, but you
1325 * get a system message that something might go wrong...
1326 *
1327 * - no (0)
1328 * -> ACPI Operation Region resources will not be registered
1329 *
1330 */
1331#define ENFORCE_RESOURCES_STRICT 2
1332#define ENFORCE_RESOURCES_LAX 1
1333#define ENFORCE_RESOURCES_NO 0
1334
1335static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1336
1337static int __init acpi_enforce_resources_setup(char *str)
1338{
1339 if (str == NULL || *str == '\0')
1340 return 0;
1341
1342 if (!strcmp("strict", str))
1343 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1344 else if (!strcmp("lax", str))
1345 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1346 else if (!strcmp("no", str))
1347 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1348
1349 return 1;
1350}
1351
1352__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1353
1354/* Check for resource conflicts between ACPI OperationRegions and native
1355 * drivers */
1356int acpi_check_resource_conflict(const struct resource *res)
1357{
1358 acpi_adr_space_type space_id;
1359 acpi_size length;
1360 u8 warn = 0;
1361 int clash = 0;
1362
1363 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1364 return 0;
1365 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1366 return 0;
1367
1368 if (res->flags & IORESOURCE_IO)
1369 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1370 else
1371 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1372
1373 length = res->end - res->start + 1;
1374 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1375 warn = 1;
1376 clash = acpi_check_address_range(space_id, res->start, length, warn);
1377
1378 if (clash) {
1379 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1380 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1381 printk(KERN_NOTICE "ACPI: This conflict may"
1382 " cause random problems and system"
1383 " instability\n");
1384 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1385 " for this device, you should use it instead of"
1386 " the native driver\n");
1387 }
1388 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1389 return -EBUSY;
1390 }
1391 return 0;
1392}
1393EXPORT_SYMBOL(acpi_check_resource_conflict);
1394
1395int acpi_check_region(resource_size_t start, resource_size_t n,
1396 const char *name)
1397{
1398 struct resource res = {
1399 .start = start,
1400 .end = start + n - 1,
1401 .name = name,
1402 .flags = IORESOURCE_IO,
1403 };
1404
1405 return acpi_check_resource_conflict(&res);
1406}
1407EXPORT_SYMBOL(acpi_check_region);
1408
1409/*
1410 * Let drivers know whether the resource checks are effective
1411 */
1412int acpi_resources_are_enforced(void)
1413{
1414 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1415}
1416EXPORT_SYMBOL(acpi_resources_are_enforced);
1417
1418/*
1419 * Deallocate the memory for a spinlock.
1420 */
1421void acpi_os_delete_lock(acpi_spinlock handle)
1422{
1423 ACPI_FREE(handle);
1424}
1425
1426/*
1427 * Acquire a spinlock.
1428 *
1429 * handle is a pointer to the spinlock_t.
1430 */
1431
1432acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1433{
1434 acpi_cpu_flags flags;
1435 spin_lock_irqsave(lockp, flags);
1436 return flags;
1437}
1438
1439/*
1440 * Release a spinlock. See above.
1441 */
1442
1443void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1444{
1445 spin_unlock_irqrestore(lockp, flags);
1446}
1447
1448#ifndef ACPI_USE_LOCAL_CACHE
1449
1450/*******************************************************************************
1451 *
1452 * FUNCTION: acpi_os_create_cache
1453 *
1454 * PARAMETERS: name - Ascii name for the cache
1455 * size - Size of each cached object
1456 * depth - Maximum depth of the cache (in objects) <ignored>
1457 * cache - Where the new cache object is returned
1458 *
1459 * RETURN: status
1460 *
1461 * DESCRIPTION: Create a cache object
1462 *
1463 ******************************************************************************/
1464
1465acpi_status
1466acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1467{
1468 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1469 if (*cache == NULL)
1470 return AE_ERROR;
1471 else
1472 return AE_OK;
1473}
1474
1475/*******************************************************************************
1476 *
1477 * FUNCTION: acpi_os_purge_cache
1478 *
1479 * PARAMETERS: Cache - Handle to cache object
1480 *
1481 * RETURN: Status
1482 *
1483 * DESCRIPTION: Free all objects within the requested cache.
1484 *
1485 ******************************************************************************/
1486
1487acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1488{
1489 kmem_cache_shrink(cache);
1490 return (AE_OK);
1491}
1492
1493/*******************************************************************************
1494 *
1495 * FUNCTION: acpi_os_delete_cache
1496 *
1497 * PARAMETERS: Cache - Handle to cache object
1498 *
1499 * RETURN: Status
1500 *
1501 * DESCRIPTION: Free all objects within the requested cache and delete the
1502 * cache object.
1503 *
1504 ******************************************************************************/
1505
1506acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1507{
1508 kmem_cache_destroy(cache);
1509 return (AE_OK);
1510}
1511
1512/*******************************************************************************
1513 *
1514 * FUNCTION: acpi_os_release_object
1515 *
1516 * PARAMETERS: Cache - Handle to cache object
1517 * Object - The object to be released
1518 *
1519 * RETURN: None
1520 *
1521 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1522 * the object is deleted.
1523 *
1524 ******************************************************************************/
1525
1526acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1527{
1528 kmem_cache_free(cache, object);
1529 return (AE_OK);
1530}
1531#endif
1532
1533acpi_status __init acpi_os_initialize(void)
1534{
1535 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1536 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1537 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1538 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1539
1540 return AE_OK;
1541}
1542
1543acpi_status __init acpi_os_initialize1(void)
1544{
1545 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1546 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1547 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1548 BUG_ON(!kacpid_wq);
1549 BUG_ON(!kacpi_notify_wq);
1550 BUG_ON(!kacpi_hotplug_wq);
1551 acpi_install_interface_handler(acpi_osi_handler);
1552 acpi_osi_setup_late();
1553 return AE_OK;
1554}
1555
1556acpi_status acpi_os_terminate(void)
1557{
1558 if (acpi_irq_handler) {
1559 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1560 acpi_irq_handler);
1561 }
1562
1563 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1564 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1565 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1566 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1567
1568 destroy_workqueue(kacpid_wq);
1569 destroy_workqueue(kacpi_notify_wq);
1570 destroy_workqueue(kacpi_hotplug_wq);
1571
1572 return AE_OK;
1573}
1574
1575acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1576 u32 pm1b_control)
1577{
1578 int rc = 0;
1579 if (__acpi_os_prepare_sleep)
1580 rc = __acpi_os_prepare_sleep(sleep_state,
1581 pm1a_control, pm1b_control);
1582 if (rc < 0)
1583 return AE_ERROR;
1584 else if (rc > 0)
1585 return AE_CTRL_SKIP;
1586
1587 return AE_OK;
1588}
1589
1590void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1591 u32 pm1a_ctrl, u32 pm1b_ctrl))
1592{
1593 __acpi_os_prepare_sleep = func;
1594}
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/highmem.h>
35#include <linux/pci.h>
36#include <linux/interrupt.h>
37#include <linux/kmod.h>
38#include <linux/delay.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 "internal.h"
52
53#define _COMPONENT ACPI_OS_SERVICES
54ACPI_MODULE_NAME("osl");
55
56struct acpi_os_dpc {
57 acpi_osd_exec_callback function;
58 void *context;
59 struct work_struct work;
60};
61
62#ifdef CONFIG_ACPI_CUSTOM_DSDT
63#include CONFIG_ACPI_CUSTOM_DSDT_FILE
64#endif
65
66#ifdef ENABLE_DEBUGGER
67#include <linux/kdb.h>
68
69/* stuff for debugger support */
70int acpi_in_debugger;
71EXPORT_SYMBOL(acpi_in_debugger);
72
73extern char line_buf[80];
74#endif /*ENABLE_DEBUGGER */
75
76static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
77 u32 pm1b_ctrl);
78static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
79 u32 val_b);
80
81static acpi_osd_handler acpi_irq_handler;
82static void *acpi_irq_context;
83static struct workqueue_struct *kacpid_wq;
84static struct workqueue_struct *kacpi_notify_wq;
85static struct workqueue_struct *kacpi_hotplug_wq;
86
87/*
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
90 */
91struct acpi_ioremap {
92 struct list_head list;
93 void __iomem *virt;
94 acpi_physical_address phys;
95 acpi_size size;
96 unsigned long refcount;
97};
98
99static LIST_HEAD(acpi_ioremaps);
100static DEFINE_MUTEX(acpi_ioremap_lock);
101
102static void __init acpi_osi_setup_late(void);
103
104/*
105 * The story of _OSI(Linux)
106 *
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
109 *
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
114 *
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
126 *
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
129 *
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
135 */
136
137static struct osi_linux {
138 unsigned int enable:1;
139 unsigned int dmi:1;
140 unsigned int cmdline:1;
141 unsigned int default_disabling:1;
142} osi_linux = {0, 0, 0, 0};
143
144static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145{
146 if (!strcmp("Linux", interface)) {
147
148 printk_once(KERN_NOTICE FW_BUG PREFIX
149 "BIOS _OSI(Linux) query %s%s\n",
150 osi_linux.enable ? "honored" : "ignored",
151 osi_linux.cmdline ? " via cmdline" :
152 osi_linux.dmi ? " via DMI" : "");
153 }
154
155 return supported;
156}
157
158static void __init acpi_request_region (struct acpi_generic_address *gas,
159 unsigned int length, char *desc)
160{
161 u64 addr;
162
163 /* Handle possible alignment issues */
164 memcpy(&addr, &gas->address, sizeof(addr));
165 if (!addr || !length)
166 return;
167
168 /* Resources are never freed */
169 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
170 request_region(addr, length, desc);
171 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
172 request_mem_region(addr, length, desc);
173}
174
175static int __init acpi_reserve_resources(void)
176{
177 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
178 "ACPI PM1a_EVT_BLK");
179
180 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
181 "ACPI PM1b_EVT_BLK");
182
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
184 "ACPI PM1a_CNT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
187 "ACPI PM1b_CNT_BLK");
188
189 if (acpi_gbl_FADT.pm_timer_length == 4)
190 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
193 "ACPI PM2_CNT_BLK");
194
195 /* Length of GPE blocks must be a non-negative multiple of 2 */
196
197 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
198 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
199 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200
201 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
202 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
203 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
204
205 return 0;
206}
207device_initcall(acpi_reserve_resources);
208
209void acpi_os_printf(const char *fmt, ...)
210{
211 va_list args;
212 va_start(args, fmt);
213 acpi_os_vprintf(fmt, args);
214 va_end(args);
215}
216
217void acpi_os_vprintf(const char *fmt, va_list args)
218{
219 static char buffer[512];
220
221 vsprintf(buffer, fmt, args);
222
223#ifdef ENABLE_DEBUGGER
224 if (acpi_in_debugger) {
225 kdb_printf("%s", buffer);
226 } else {
227 printk(KERN_CONT "%s", buffer);
228 }
229#else
230 printk(KERN_CONT "%s", buffer);
231#endif
232}
233
234#ifdef CONFIG_KEXEC
235static unsigned long acpi_rsdp;
236static int __init setup_acpi_rsdp(char *arg)
237{
238 acpi_rsdp = simple_strtoul(arg, NULL, 16);
239 return 0;
240}
241early_param("acpi_rsdp", setup_acpi_rsdp);
242#endif
243
244acpi_physical_address __init acpi_os_get_root_pointer(void)
245{
246#ifdef CONFIG_KEXEC
247 if (acpi_rsdp)
248 return acpi_rsdp;
249#endif
250
251 if (efi_enabled(EFI_CONFIG_TABLES)) {
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/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
270static struct acpi_ioremap *
271acpi_map_lookup(acpi_physical_address phys, acpi_size size)
272{
273 struct acpi_ioremap *map;
274
275 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
276 if (map->phys <= phys &&
277 phys + size <= map->phys + map->size)
278 return map;
279
280 return NULL;
281}
282
283/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
284static void __iomem *
285acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
286{
287 struct acpi_ioremap *map;
288
289 map = acpi_map_lookup(phys, size);
290 if (map)
291 return map->virt + (phys - map->phys);
292
293 return NULL;
294}
295
296void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
297{
298 struct acpi_ioremap *map;
299 void __iomem *virt = NULL;
300
301 mutex_lock(&acpi_ioremap_lock);
302 map = acpi_map_lookup(phys, size);
303 if (map) {
304 virt = map->virt + (phys - map->phys);
305 map->refcount++;
306 }
307 mutex_unlock(&acpi_ioremap_lock);
308 return virt;
309}
310EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
311
312/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
313static struct acpi_ioremap *
314acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
315{
316 struct acpi_ioremap *map;
317
318 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
319 if (map->virt <= virt &&
320 virt + size <= map->virt + map->size)
321 return map;
322
323 return NULL;
324}
325
326#ifndef CONFIG_IA64
327#define should_use_kmap(pfn) page_is_ram(pfn)
328#else
329/* ioremap will take care of cache attributes */
330#define should_use_kmap(pfn) 0
331#endif
332
333static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
334{
335 unsigned long pfn;
336
337 pfn = pg_off >> PAGE_SHIFT;
338 if (should_use_kmap(pfn)) {
339 if (pg_sz > PAGE_SIZE)
340 return NULL;
341 return (void __iomem __force *)kmap(pfn_to_page(pfn));
342 } else
343 return acpi_os_ioremap(pg_off, pg_sz);
344}
345
346static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
347{
348 unsigned long pfn;
349
350 pfn = pg_off >> PAGE_SHIFT;
351 if (should_use_kmap(pfn))
352 kunmap(pfn_to_page(pfn));
353 else
354 iounmap(vaddr);
355}
356
357void __iomem *__init_refok
358acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
359{
360 struct acpi_ioremap *map;
361 void __iomem *virt;
362 acpi_physical_address pg_off;
363 acpi_size pg_sz;
364
365 if (phys > ULONG_MAX) {
366 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
367 return NULL;
368 }
369
370 if (!acpi_gbl_permanent_mmap)
371 return __acpi_map_table((unsigned long)phys, size);
372
373 mutex_lock(&acpi_ioremap_lock);
374 /* Check if there's a suitable mapping already. */
375 map = acpi_map_lookup(phys, size);
376 if (map) {
377 map->refcount++;
378 goto out;
379 }
380
381 map = kzalloc(sizeof(*map), GFP_KERNEL);
382 if (!map) {
383 mutex_unlock(&acpi_ioremap_lock);
384 return NULL;
385 }
386
387 pg_off = round_down(phys, PAGE_SIZE);
388 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
389 virt = acpi_map(pg_off, pg_sz);
390 if (!virt) {
391 mutex_unlock(&acpi_ioremap_lock);
392 kfree(map);
393 return NULL;
394 }
395
396 INIT_LIST_HEAD(&map->list);
397 map->virt = virt;
398 map->phys = pg_off;
399 map->size = pg_sz;
400 map->refcount = 1;
401
402 list_add_tail_rcu(&map->list, &acpi_ioremaps);
403
404 out:
405 mutex_unlock(&acpi_ioremap_lock);
406 return map->virt + (phys - map->phys);
407}
408EXPORT_SYMBOL_GPL(acpi_os_map_memory);
409
410static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
411{
412 if (!--map->refcount)
413 list_del_rcu(&map->list);
414}
415
416static void acpi_os_map_cleanup(struct acpi_ioremap *map)
417{
418 if (!map->refcount) {
419 synchronize_rcu();
420 acpi_unmap(map->phys, map->virt);
421 kfree(map);
422 }
423}
424
425void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
426{
427 struct acpi_ioremap *map;
428
429 if (!acpi_gbl_permanent_mmap) {
430 __acpi_unmap_table(virt, size);
431 return;
432 }
433
434 mutex_lock(&acpi_ioremap_lock);
435 map = acpi_map_lookup_virt(virt, size);
436 if (!map) {
437 mutex_unlock(&acpi_ioremap_lock);
438 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
439 return;
440 }
441 acpi_os_drop_map_ref(map);
442 mutex_unlock(&acpi_ioremap_lock);
443
444 acpi_os_map_cleanup(map);
445}
446EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
447
448void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
449{
450 if (!acpi_gbl_permanent_mmap)
451 __acpi_unmap_table(virt, size);
452}
453
454int acpi_os_map_generic_address(struct acpi_generic_address *gas)
455{
456 u64 addr;
457 void __iomem *virt;
458
459 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
460 return 0;
461
462 /* Handle possible alignment issues */
463 memcpy(&addr, &gas->address, sizeof(addr));
464 if (!addr || !gas->bit_width)
465 return -EINVAL;
466
467 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
468 if (!virt)
469 return -EIO;
470
471 return 0;
472}
473EXPORT_SYMBOL(acpi_os_map_generic_address);
474
475void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
476{
477 u64 addr;
478 struct acpi_ioremap *map;
479
480 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
481 return;
482
483 /* Handle possible alignment issues */
484 memcpy(&addr, &gas->address, sizeof(addr));
485 if (!addr || !gas->bit_width)
486 return;
487
488 mutex_lock(&acpi_ioremap_lock);
489 map = acpi_map_lookup(addr, gas->bit_width / 8);
490 if (!map) {
491 mutex_unlock(&acpi_ioremap_lock);
492 return;
493 }
494 acpi_os_drop_map_ref(map);
495 mutex_unlock(&acpi_ioremap_lock);
496
497 acpi_os_map_cleanup(map);
498}
499EXPORT_SYMBOL(acpi_os_unmap_generic_address);
500
501#ifdef ACPI_FUTURE_USAGE
502acpi_status
503acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
504{
505 if (!phys || !virt)
506 return AE_BAD_PARAMETER;
507
508 *phys = virt_to_phys(virt);
509
510 return AE_OK;
511}
512#endif
513
514#define ACPI_MAX_OVERRIDE_LEN 100
515
516static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
517
518acpi_status
519acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
520 acpi_string * new_val)
521{
522 if (!init_val || !new_val)
523 return AE_BAD_PARAMETER;
524
525 *new_val = NULL;
526 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
527 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
528 acpi_os_name);
529 *new_val = acpi_os_name;
530 }
531
532 return AE_OK;
533}
534
535#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
536#include <linux/earlycpio.h>
537#include <linux/memblock.h>
538
539static u64 acpi_tables_addr;
540static int all_tables_size;
541
542/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
543static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
544{
545 u8 sum = 0;
546 u8 *end = buffer + length;
547
548 while (buffer < end)
549 sum = (u8) (sum + *(buffer++));
550 return sum;
551}
552
553/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
554static const char * const table_sigs[] = {
555 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
556 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
557 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
558 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
559 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
560 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
561 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
562 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
563 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
564
565#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
566
567#define ACPI_OVERRIDE_TABLES 64
568static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
569
570#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
571
572void __init acpi_initrd_override(void *data, size_t size)
573{
574 int sig, no, table_nr = 0, total_offset = 0;
575 long offset = 0;
576 struct acpi_table_header *table;
577 char cpio_path[32] = "kernel/firmware/acpi/";
578 struct cpio_data file;
579
580 if (data == NULL || size == 0)
581 return;
582
583 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
584 file = find_cpio_data(cpio_path, data, size, &offset);
585 if (!file.data)
586 break;
587
588 data += offset;
589 size -= offset;
590
591 if (file.size < sizeof(struct acpi_table_header)) {
592 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
593 cpio_path, file.name);
594 continue;
595 }
596
597 table = file.data;
598
599 for (sig = 0; table_sigs[sig]; sig++)
600 if (!memcmp(table->signature, table_sigs[sig], 4))
601 break;
602
603 if (!table_sigs[sig]) {
604 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
605 cpio_path, file.name);
606 continue;
607 }
608 if (file.size != table->length) {
609 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
610 cpio_path, file.name);
611 continue;
612 }
613 if (acpi_table_checksum(file.data, table->length)) {
614 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
615 cpio_path, file.name);
616 continue;
617 }
618
619 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
620 table->signature, cpio_path, file.name, table->length);
621
622 all_tables_size += table->length;
623 acpi_initrd_files[table_nr].data = file.data;
624 acpi_initrd_files[table_nr].size = file.size;
625 table_nr++;
626 }
627 if (table_nr == 0)
628 return;
629
630 acpi_tables_addr =
631 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
632 all_tables_size, PAGE_SIZE);
633 if (!acpi_tables_addr) {
634 WARN_ON(1);
635 return;
636 }
637 /*
638 * Only calling e820_add_reserve does not work and the
639 * tables are invalid (memory got used) later.
640 * memblock_reserve works as expected and the tables won't get modified.
641 * But it's not enough on X86 because ioremap will
642 * complain later (used by acpi_os_map_memory) that the pages
643 * that should get mapped are not marked "reserved".
644 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
645 * works fine.
646 */
647 memblock_reserve(acpi_tables_addr, all_tables_size);
648 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
649
650 /*
651 * early_ioremap only can remap 256k one time. If we map all
652 * tables one time, we will hit the limit. Need to map chunks
653 * one by one during copying the same as that in relocate_initrd().
654 */
655 for (no = 0; no < table_nr; no++) {
656 unsigned char *src_p = acpi_initrd_files[no].data;
657 phys_addr_t size = acpi_initrd_files[no].size;
658 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
659 phys_addr_t slop, clen;
660 char *dest_p;
661
662 total_offset += size;
663
664 while (size) {
665 slop = dest_addr & ~PAGE_MASK;
666 clen = size;
667 if (clen > MAP_CHUNK_SIZE - slop)
668 clen = MAP_CHUNK_SIZE - slop;
669 dest_p = early_ioremap(dest_addr & PAGE_MASK,
670 clen + slop);
671 memcpy(dest_p + slop, src_p, clen);
672 early_iounmap(dest_p, clen + slop);
673 src_p += clen;
674 dest_addr += clen;
675 size -= clen;
676 }
677 }
678}
679#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
680
681static void acpi_table_taint(struct acpi_table_header *table)
682{
683 pr_warn(PREFIX
684 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
685 table->signature, table->oem_table_id);
686 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
687}
688
689
690acpi_status
691acpi_os_table_override(struct acpi_table_header * existing_table,
692 struct acpi_table_header ** new_table)
693{
694 if (!existing_table || !new_table)
695 return AE_BAD_PARAMETER;
696
697 *new_table = NULL;
698
699#ifdef CONFIG_ACPI_CUSTOM_DSDT
700 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
701 *new_table = (struct acpi_table_header *)AmlCode;
702#endif
703 if (*new_table != NULL)
704 acpi_table_taint(existing_table);
705 return AE_OK;
706}
707
708acpi_status
709acpi_os_physical_table_override(struct acpi_table_header *existing_table,
710 acpi_physical_address *address,
711 u32 *table_length)
712{
713#ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
714 *table_length = 0;
715 *address = 0;
716 return AE_OK;
717#else
718 int table_offset = 0;
719 struct acpi_table_header *table;
720
721 *table_length = 0;
722 *address = 0;
723
724 if (!acpi_tables_addr)
725 return AE_OK;
726
727 do {
728 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
729 WARN_ON(1);
730 return AE_OK;
731 }
732
733 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
734 ACPI_HEADER_SIZE);
735
736 if (table_offset + table->length > all_tables_size) {
737 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
738 WARN_ON(1);
739 return AE_OK;
740 }
741
742 table_offset += table->length;
743
744 if (memcmp(existing_table->signature, table->signature, 4)) {
745 acpi_os_unmap_memory(table,
746 ACPI_HEADER_SIZE);
747 continue;
748 }
749
750 /* Only override tables with matching oem id */
751 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
752 ACPI_OEM_TABLE_ID_SIZE)) {
753 acpi_os_unmap_memory(table,
754 ACPI_HEADER_SIZE);
755 continue;
756 }
757
758 table_offset -= table->length;
759 *table_length = table->length;
760 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
761 *address = acpi_tables_addr + table_offset;
762 break;
763 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
764
765 if (*address != 0)
766 acpi_table_taint(existing_table);
767 return AE_OK;
768#endif
769}
770
771static irqreturn_t acpi_irq(int irq, void *dev_id)
772{
773 u32 handled;
774
775 handled = (*acpi_irq_handler) (acpi_irq_context);
776
777 if (handled) {
778 acpi_irq_handled++;
779 return IRQ_HANDLED;
780 } else {
781 acpi_irq_not_handled++;
782 return IRQ_NONE;
783 }
784}
785
786acpi_status
787acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
788 void *context)
789{
790 unsigned int irq;
791
792 acpi_irq_stats_init();
793
794 /*
795 * ACPI interrupts different from the SCI in our copy of the FADT are
796 * not supported.
797 */
798 if (gsi != acpi_gbl_FADT.sci_interrupt)
799 return AE_BAD_PARAMETER;
800
801 if (acpi_irq_handler)
802 return AE_ALREADY_ACQUIRED;
803
804 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
805 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
806 gsi);
807 return AE_OK;
808 }
809
810 acpi_irq_handler = handler;
811 acpi_irq_context = context;
812 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
813 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
814 acpi_irq_handler = NULL;
815 return AE_NOT_ACQUIRED;
816 }
817
818 return AE_OK;
819}
820
821acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
822{
823 if (irq != acpi_gbl_FADT.sci_interrupt)
824 return AE_BAD_PARAMETER;
825
826 free_irq(irq, acpi_irq);
827 acpi_irq_handler = NULL;
828
829 return AE_OK;
830}
831
832/*
833 * Running in interpreter thread context, safe to sleep
834 */
835
836void acpi_os_sleep(u64 ms)
837{
838 msleep(ms);
839}
840
841void acpi_os_stall(u32 us)
842{
843 while (us) {
844 u32 delay = 1000;
845
846 if (delay > us)
847 delay = us;
848 udelay(delay);
849 touch_nmi_watchdog();
850 us -= delay;
851 }
852}
853
854/*
855 * Support ACPI 3.0 AML Timer operand
856 * Returns 64-bit free-running, monotonically increasing timer
857 * with 100ns granularity
858 */
859u64 acpi_os_get_timer(void)
860{
861 u64 time_ns = ktime_to_ns(ktime_get());
862 do_div(time_ns, 100);
863 return time_ns;
864}
865
866acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
867{
868 u32 dummy;
869
870 if (!value)
871 value = &dummy;
872
873 *value = 0;
874 if (width <= 8) {
875 *(u8 *) value = inb(port);
876 } else if (width <= 16) {
877 *(u16 *) value = inw(port);
878 } else if (width <= 32) {
879 *(u32 *) value = inl(port);
880 } else {
881 BUG();
882 }
883
884 return AE_OK;
885}
886
887EXPORT_SYMBOL(acpi_os_read_port);
888
889acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
890{
891 if (width <= 8) {
892 outb(value, port);
893 } else if (width <= 16) {
894 outw(value, port);
895 } else if (width <= 32) {
896 outl(value, port);
897 } else {
898 BUG();
899 }
900
901 return AE_OK;
902}
903
904EXPORT_SYMBOL(acpi_os_write_port);
905
906#ifdef readq
907static inline u64 read64(const volatile void __iomem *addr)
908{
909 return readq(addr);
910}
911#else
912static inline u64 read64(const volatile void __iomem *addr)
913{
914 u64 l, h;
915 l = readl(addr);
916 h = readl(addr+4);
917 return l | (h << 32);
918}
919#endif
920
921acpi_status
922acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
923{
924 void __iomem *virt_addr;
925 unsigned int size = width / 8;
926 bool unmap = false;
927 u64 dummy;
928
929 rcu_read_lock();
930 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
931 if (!virt_addr) {
932 rcu_read_unlock();
933 virt_addr = acpi_os_ioremap(phys_addr, size);
934 if (!virt_addr)
935 return AE_BAD_ADDRESS;
936 unmap = true;
937 }
938
939 if (!value)
940 value = &dummy;
941
942 switch (width) {
943 case 8:
944 *(u8 *) value = readb(virt_addr);
945 break;
946 case 16:
947 *(u16 *) value = readw(virt_addr);
948 break;
949 case 32:
950 *(u32 *) value = readl(virt_addr);
951 break;
952 case 64:
953 *(u64 *) value = read64(virt_addr);
954 break;
955 default:
956 BUG();
957 }
958
959 if (unmap)
960 iounmap(virt_addr);
961 else
962 rcu_read_unlock();
963
964 return AE_OK;
965}
966
967#ifdef writeq
968static inline void write64(u64 val, volatile void __iomem *addr)
969{
970 writeq(val, addr);
971}
972#else
973static inline void write64(u64 val, volatile void __iomem *addr)
974{
975 writel(val, addr);
976 writel(val>>32, addr+4);
977}
978#endif
979
980acpi_status
981acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
982{
983 void __iomem *virt_addr;
984 unsigned int size = width / 8;
985 bool unmap = false;
986
987 rcu_read_lock();
988 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
989 if (!virt_addr) {
990 rcu_read_unlock();
991 virt_addr = acpi_os_ioremap(phys_addr, size);
992 if (!virt_addr)
993 return AE_BAD_ADDRESS;
994 unmap = true;
995 }
996
997 switch (width) {
998 case 8:
999 writeb(value, virt_addr);
1000 break;
1001 case 16:
1002 writew(value, virt_addr);
1003 break;
1004 case 32:
1005 writel(value, virt_addr);
1006 break;
1007 case 64:
1008 write64(value, virt_addr);
1009 break;
1010 default:
1011 BUG();
1012 }
1013
1014 if (unmap)
1015 iounmap(virt_addr);
1016 else
1017 rcu_read_unlock();
1018
1019 return AE_OK;
1020}
1021
1022acpi_status
1023acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1024 u64 *value, u32 width)
1025{
1026 int result, size;
1027 u32 value32;
1028
1029 if (!value)
1030 return AE_BAD_PARAMETER;
1031
1032 switch (width) {
1033 case 8:
1034 size = 1;
1035 break;
1036 case 16:
1037 size = 2;
1038 break;
1039 case 32:
1040 size = 4;
1041 break;
1042 default:
1043 return AE_ERROR;
1044 }
1045
1046 result = raw_pci_read(pci_id->segment, pci_id->bus,
1047 PCI_DEVFN(pci_id->device, pci_id->function),
1048 reg, size, &value32);
1049 *value = value32;
1050
1051 return (result ? AE_ERROR : AE_OK);
1052}
1053
1054acpi_status
1055acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1056 u64 value, u32 width)
1057{
1058 int result, size;
1059
1060 switch (width) {
1061 case 8:
1062 size = 1;
1063 break;
1064 case 16:
1065 size = 2;
1066 break;
1067 case 32:
1068 size = 4;
1069 break;
1070 default:
1071 return AE_ERROR;
1072 }
1073
1074 result = raw_pci_write(pci_id->segment, pci_id->bus,
1075 PCI_DEVFN(pci_id->device, pci_id->function),
1076 reg, size, value);
1077
1078 return (result ? AE_ERROR : AE_OK);
1079}
1080
1081static void acpi_os_execute_deferred(struct work_struct *work)
1082{
1083 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1084
1085 dpc->function(dpc->context);
1086 kfree(dpc);
1087}
1088
1089/*******************************************************************************
1090 *
1091 * FUNCTION: acpi_os_execute
1092 *
1093 * PARAMETERS: Type - Type of the callback
1094 * Function - Function to be executed
1095 * Context - Function parameters
1096 *
1097 * RETURN: Status
1098 *
1099 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1100 * immediately executes function on a separate thread.
1101 *
1102 ******************************************************************************/
1103
1104acpi_status acpi_os_execute(acpi_execute_type type,
1105 acpi_osd_exec_callback function, void *context)
1106{
1107 acpi_status status = AE_OK;
1108 struct acpi_os_dpc *dpc;
1109 struct workqueue_struct *queue;
1110 int ret;
1111 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1112 "Scheduling function [%p(%p)] for deferred execution.\n",
1113 function, context));
1114
1115 /*
1116 * Allocate/initialize DPC structure. Note that this memory will be
1117 * freed by the callee. The kernel handles the work_struct list in a
1118 * way that allows us to also free its memory inside the callee.
1119 * Because we may want to schedule several tasks with different
1120 * parameters we can't use the approach some kernel code uses of
1121 * having a static work_struct.
1122 */
1123
1124 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1125 if (!dpc)
1126 return AE_NO_MEMORY;
1127
1128 dpc->function = function;
1129 dpc->context = context;
1130
1131 /*
1132 * To prevent lockdep from complaining unnecessarily, make sure that
1133 * there is a different static lockdep key for each workqueue by using
1134 * INIT_WORK() for each of them separately.
1135 */
1136 if (type == OSL_NOTIFY_HANDLER) {
1137 queue = kacpi_notify_wq;
1138 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1139 } else {
1140 queue = kacpid_wq;
1141 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1142 }
1143
1144 /*
1145 * On some machines, a software-initiated SMI causes corruption unless
1146 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1147 * typically it's done in GPE-related methods that are run via
1148 * workqueues, so we can avoid the known corruption cases by always
1149 * queueing on CPU 0.
1150 */
1151 ret = queue_work_on(0, queue, &dpc->work);
1152
1153 if (!ret) {
1154 printk(KERN_ERR PREFIX
1155 "Call to queue_work() failed.\n");
1156 status = AE_ERROR;
1157 kfree(dpc);
1158 }
1159 return status;
1160}
1161EXPORT_SYMBOL(acpi_os_execute);
1162
1163void acpi_os_wait_events_complete(void)
1164{
1165 flush_workqueue(kacpid_wq);
1166 flush_workqueue(kacpi_notify_wq);
1167}
1168
1169struct acpi_hp_work {
1170 struct work_struct work;
1171 struct acpi_device *adev;
1172 u32 src;
1173};
1174
1175static void acpi_hotplug_work_fn(struct work_struct *work)
1176{
1177 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1178
1179 acpi_os_wait_events_complete();
1180 acpi_device_hotplug(hpw->adev, hpw->src);
1181 kfree(hpw);
1182}
1183
1184acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1185{
1186 struct acpi_hp_work *hpw;
1187
1188 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1189 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1190 adev, src));
1191
1192 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1193 if (!hpw)
1194 return AE_NO_MEMORY;
1195
1196 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1197 hpw->adev = adev;
1198 hpw->src = src;
1199 /*
1200 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1201 * the hotplug code may call driver .remove() functions, which may
1202 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1203 * these workqueues.
1204 */
1205 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1206 kfree(hpw);
1207 return AE_ERROR;
1208 }
1209 return AE_OK;
1210}
1211
1212bool acpi_queue_hotplug_work(struct work_struct *work)
1213{
1214 return queue_work(kacpi_hotplug_wq, work);
1215}
1216
1217acpi_status
1218acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1219{
1220 struct semaphore *sem = NULL;
1221
1222 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1223 if (!sem)
1224 return AE_NO_MEMORY;
1225
1226 sema_init(sem, initial_units);
1227
1228 *handle = (acpi_handle *) sem;
1229
1230 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1231 *handle, initial_units));
1232
1233 return AE_OK;
1234}
1235
1236/*
1237 * TODO: A better way to delete semaphores? Linux doesn't have a
1238 * 'delete_semaphore()' function -- may result in an invalid
1239 * pointer dereference for non-synchronized consumers. Should
1240 * we at least check for blocked threads and signal/cancel them?
1241 */
1242
1243acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1244{
1245 struct semaphore *sem = (struct semaphore *)handle;
1246
1247 if (!sem)
1248 return AE_BAD_PARAMETER;
1249
1250 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1251
1252 BUG_ON(!list_empty(&sem->wait_list));
1253 kfree(sem);
1254 sem = NULL;
1255
1256 return AE_OK;
1257}
1258
1259/*
1260 * TODO: Support for units > 1?
1261 */
1262acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1263{
1264 acpi_status status = AE_OK;
1265 struct semaphore *sem = (struct semaphore *)handle;
1266 long jiffies;
1267 int ret = 0;
1268
1269 if (!sem || (units < 1))
1270 return AE_BAD_PARAMETER;
1271
1272 if (units > 1)
1273 return AE_SUPPORT;
1274
1275 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1276 handle, units, timeout));
1277
1278 if (timeout == ACPI_WAIT_FOREVER)
1279 jiffies = MAX_SCHEDULE_TIMEOUT;
1280 else
1281 jiffies = msecs_to_jiffies(timeout);
1282
1283 ret = down_timeout(sem, jiffies);
1284 if (ret)
1285 status = AE_TIME;
1286
1287 if (ACPI_FAILURE(status)) {
1288 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1289 "Failed to acquire semaphore[%p|%d|%d], %s",
1290 handle, units, timeout,
1291 acpi_format_exception(status)));
1292 } else {
1293 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1294 "Acquired semaphore[%p|%d|%d]", handle,
1295 units, timeout));
1296 }
1297
1298 return status;
1299}
1300
1301/*
1302 * TODO: Support for units > 1?
1303 */
1304acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1305{
1306 struct semaphore *sem = (struct semaphore *)handle;
1307
1308 if (!sem || (units < 1))
1309 return AE_BAD_PARAMETER;
1310
1311 if (units > 1)
1312 return AE_SUPPORT;
1313
1314 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1315 units));
1316
1317 up(sem);
1318
1319 return AE_OK;
1320}
1321
1322#ifdef ACPI_FUTURE_USAGE
1323u32 acpi_os_get_line(char *buffer)
1324{
1325
1326#ifdef ENABLE_DEBUGGER
1327 if (acpi_in_debugger) {
1328 u32 chars;
1329
1330 kdb_read(buffer, sizeof(line_buf));
1331
1332 /* remove the CR kdb includes */
1333 chars = strlen(buffer) - 1;
1334 buffer[chars] = '\0';
1335 }
1336#endif
1337
1338 return 0;
1339}
1340#endif /* ACPI_FUTURE_USAGE */
1341
1342acpi_status acpi_os_signal(u32 function, void *info)
1343{
1344 switch (function) {
1345 case ACPI_SIGNAL_FATAL:
1346 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1347 break;
1348 case ACPI_SIGNAL_BREAKPOINT:
1349 /*
1350 * AML Breakpoint
1351 * ACPI spec. says to treat it as a NOP unless
1352 * you are debugging. So if/when we integrate
1353 * AML debugger into the kernel debugger its
1354 * hook will go here. But until then it is
1355 * not useful to print anything on breakpoints.
1356 */
1357 break;
1358 default:
1359 break;
1360 }
1361
1362 return AE_OK;
1363}
1364
1365static int __init acpi_os_name_setup(char *str)
1366{
1367 char *p = acpi_os_name;
1368 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1369
1370 if (!str || !*str)
1371 return 0;
1372
1373 for (; count-- && *str; str++) {
1374 if (isalnum(*str) || *str == ' ' || *str == ':')
1375 *p++ = *str;
1376 else if (*str == '\'' || *str == '"')
1377 continue;
1378 else
1379 break;
1380 }
1381 *p = 0;
1382
1383 return 1;
1384
1385}
1386
1387__setup("acpi_os_name=", acpi_os_name_setup);
1388
1389#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1390#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1391
1392struct osi_setup_entry {
1393 char string[OSI_STRING_LENGTH_MAX];
1394 bool enable;
1395};
1396
1397static struct osi_setup_entry
1398 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1399 {"Module Device", true},
1400 {"Processor Device", true},
1401 {"3.0 _SCP Extensions", true},
1402 {"Processor Aggregator Device", true},
1403};
1404
1405void __init acpi_osi_setup(char *str)
1406{
1407 struct osi_setup_entry *osi;
1408 bool enable = true;
1409 int i;
1410
1411 if (!acpi_gbl_create_osi_method)
1412 return;
1413
1414 if (str == NULL || *str == '\0') {
1415 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1416 acpi_gbl_create_osi_method = FALSE;
1417 return;
1418 }
1419
1420 if (*str == '!') {
1421 str++;
1422 if (*str == '\0') {
1423 osi_linux.default_disabling = 1;
1424 return;
1425 } else if (*str == '*') {
1426 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1427 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1428 osi = &osi_setup_entries[i];
1429 osi->enable = false;
1430 }
1431 return;
1432 }
1433 enable = false;
1434 }
1435
1436 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1437 osi = &osi_setup_entries[i];
1438 if (!strcmp(osi->string, str)) {
1439 osi->enable = enable;
1440 break;
1441 } else if (osi->string[0] == '\0') {
1442 osi->enable = enable;
1443 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1444 break;
1445 }
1446 }
1447}
1448
1449static void __init set_osi_linux(unsigned int enable)
1450{
1451 if (osi_linux.enable != enable)
1452 osi_linux.enable = enable;
1453
1454 if (osi_linux.enable)
1455 acpi_osi_setup("Linux");
1456 else
1457 acpi_osi_setup("!Linux");
1458
1459 return;
1460}
1461
1462static void __init acpi_cmdline_osi_linux(unsigned int enable)
1463{
1464 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1465 osi_linux.dmi = 0;
1466 set_osi_linux(enable);
1467
1468 return;
1469}
1470
1471void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1472{
1473 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1474
1475 if (enable == -1)
1476 return;
1477
1478 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1479 set_osi_linux(enable);
1480
1481 return;
1482}
1483
1484/*
1485 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1486 *
1487 * empty string disables _OSI
1488 * string starting with '!' disables that string
1489 * otherwise string is added to list, augmenting built-in strings
1490 */
1491static void __init acpi_osi_setup_late(void)
1492{
1493 struct osi_setup_entry *osi;
1494 char *str;
1495 int i;
1496 acpi_status status;
1497
1498 if (osi_linux.default_disabling) {
1499 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1500
1501 if (ACPI_SUCCESS(status))
1502 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1503 }
1504
1505 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1506 osi = &osi_setup_entries[i];
1507 str = osi->string;
1508
1509 if (*str == '\0')
1510 break;
1511 if (osi->enable) {
1512 status = acpi_install_interface(str);
1513
1514 if (ACPI_SUCCESS(status))
1515 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1516 } else {
1517 status = acpi_remove_interface(str);
1518
1519 if (ACPI_SUCCESS(status))
1520 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1521 }
1522 }
1523}
1524
1525static int __init osi_setup(char *str)
1526{
1527 if (str && !strcmp("Linux", str))
1528 acpi_cmdline_osi_linux(1);
1529 else if (str && !strcmp("!Linux", str))
1530 acpi_cmdline_osi_linux(0);
1531 else
1532 acpi_osi_setup(str);
1533
1534 return 1;
1535}
1536
1537__setup("acpi_osi=", osi_setup);
1538
1539/*
1540 * Disable the auto-serialization of named objects creation methods.
1541 *
1542 * This feature is enabled by default. It marks the AML control methods
1543 * that contain the opcodes to create named objects as "Serialized".
1544 */
1545static int __init acpi_no_auto_serialize_setup(char *str)
1546{
1547 acpi_gbl_auto_serialize_methods = FALSE;
1548 pr_info("ACPI: auto-serialization disabled\n");
1549
1550 return 1;
1551}
1552
1553__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1554
1555/* Check of resource interference between native drivers and ACPI
1556 * OperationRegions (SystemIO and System Memory only).
1557 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1558 * in arbitrary AML code and can interfere with legacy drivers.
1559 * acpi_enforce_resources= can be set to:
1560 *
1561 * - strict (default) (2)
1562 * -> further driver trying to access the resources will not load
1563 * - lax (1)
1564 * -> further driver trying to access the resources will load, but you
1565 * get a system message that something might go wrong...
1566 *
1567 * - no (0)
1568 * -> ACPI Operation Region resources will not be registered
1569 *
1570 */
1571#define ENFORCE_RESOURCES_STRICT 2
1572#define ENFORCE_RESOURCES_LAX 1
1573#define ENFORCE_RESOURCES_NO 0
1574
1575static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1576
1577static int __init acpi_enforce_resources_setup(char *str)
1578{
1579 if (str == NULL || *str == '\0')
1580 return 0;
1581
1582 if (!strcmp("strict", str))
1583 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1584 else if (!strcmp("lax", str))
1585 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1586 else if (!strcmp("no", str))
1587 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1588
1589 return 1;
1590}
1591
1592__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1593
1594/* Check for resource conflicts between ACPI OperationRegions and native
1595 * drivers */
1596int acpi_check_resource_conflict(const struct resource *res)
1597{
1598 acpi_adr_space_type space_id;
1599 acpi_size length;
1600 u8 warn = 0;
1601 int clash = 0;
1602
1603 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1604 return 0;
1605 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1606 return 0;
1607
1608 if (res->flags & IORESOURCE_IO)
1609 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1610 else
1611 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1612
1613 length = resource_size(res);
1614 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1615 warn = 1;
1616 clash = acpi_check_address_range(space_id, res->start, length, warn);
1617
1618 if (clash) {
1619 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1620 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1621 printk(KERN_NOTICE "ACPI: This conflict may"
1622 " cause random problems and system"
1623 " instability\n");
1624 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1625 " for this device, you should use it instead of"
1626 " the native driver\n");
1627 }
1628 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1629 return -EBUSY;
1630 }
1631 return 0;
1632}
1633EXPORT_SYMBOL(acpi_check_resource_conflict);
1634
1635int acpi_check_region(resource_size_t start, resource_size_t n,
1636 const char *name)
1637{
1638 struct resource res = {
1639 .start = start,
1640 .end = start + n - 1,
1641 .name = name,
1642 .flags = IORESOURCE_IO,
1643 };
1644
1645 return acpi_check_resource_conflict(&res);
1646}
1647EXPORT_SYMBOL(acpi_check_region);
1648
1649/*
1650 * Let drivers know whether the resource checks are effective
1651 */
1652int acpi_resources_are_enforced(void)
1653{
1654 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1655}
1656EXPORT_SYMBOL(acpi_resources_are_enforced);
1657
1658/*
1659 * Deallocate the memory for a spinlock.
1660 */
1661void acpi_os_delete_lock(acpi_spinlock handle)
1662{
1663 ACPI_FREE(handle);
1664}
1665
1666/*
1667 * Acquire a spinlock.
1668 *
1669 * handle is a pointer to the spinlock_t.
1670 */
1671
1672acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1673{
1674 acpi_cpu_flags flags;
1675 spin_lock_irqsave(lockp, flags);
1676 return flags;
1677}
1678
1679/*
1680 * Release a spinlock. See above.
1681 */
1682
1683void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1684{
1685 spin_unlock_irqrestore(lockp, flags);
1686}
1687
1688#ifndef ACPI_USE_LOCAL_CACHE
1689
1690/*******************************************************************************
1691 *
1692 * FUNCTION: acpi_os_create_cache
1693 *
1694 * PARAMETERS: name - Ascii name for the cache
1695 * size - Size of each cached object
1696 * depth - Maximum depth of the cache (in objects) <ignored>
1697 * cache - Where the new cache object is returned
1698 *
1699 * RETURN: status
1700 *
1701 * DESCRIPTION: Create a cache object
1702 *
1703 ******************************************************************************/
1704
1705acpi_status
1706acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1707{
1708 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1709 if (*cache == NULL)
1710 return AE_ERROR;
1711 else
1712 return AE_OK;
1713}
1714
1715/*******************************************************************************
1716 *
1717 * FUNCTION: acpi_os_purge_cache
1718 *
1719 * PARAMETERS: Cache - Handle to cache object
1720 *
1721 * RETURN: Status
1722 *
1723 * DESCRIPTION: Free all objects within the requested cache.
1724 *
1725 ******************************************************************************/
1726
1727acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1728{
1729 kmem_cache_shrink(cache);
1730 return (AE_OK);
1731}
1732
1733/*******************************************************************************
1734 *
1735 * FUNCTION: acpi_os_delete_cache
1736 *
1737 * PARAMETERS: Cache - Handle to cache object
1738 *
1739 * RETURN: Status
1740 *
1741 * DESCRIPTION: Free all objects within the requested cache and delete the
1742 * cache object.
1743 *
1744 ******************************************************************************/
1745
1746acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1747{
1748 kmem_cache_destroy(cache);
1749 return (AE_OK);
1750}
1751
1752/*******************************************************************************
1753 *
1754 * FUNCTION: acpi_os_release_object
1755 *
1756 * PARAMETERS: Cache - Handle to cache object
1757 * Object - The object to be released
1758 *
1759 * RETURN: None
1760 *
1761 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1762 * the object is deleted.
1763 *
1764 ******************************************************************************/
1765
1766acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1767{
1768 kmem_cache_free(cache, object);
1769 return (AE_OK);
1770}
1771#endif
1772
1773static int __init acpi_no_auto_ssdt_setup(char *s)
1774{
1775 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1776
1777 acpi_gbl_disable_ssdt_table_load = TRUE;
1778
1779 return 1;
1780}
1781
1782__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1783
1784static int __init acpi_disable_return_repair(char *s)
1785{
1786 printk(KERN_NOTICE PREFIX
1787 "ACPI: Predefined validation mechanism disabled\n");
1788 acpi_gbl_disable_auto_repair = TRUE;
1789
1790 return 1;
1791}
1792
1793__setup("acpica_no_return_repair", acpi_disable_return_repair);
1794
1795acpi_status __init acpi_os_initialize(void)
1796{
1797 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1798 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1799 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1800 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1801
1802 return AE_OK;
1803}
1804
1805acpi_status __init acpi_os_initialize1(void)
1806{
1807 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1808 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1809 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1810 BUG_ON(!kacpid_wq);
1811 BUG_ON(!kacpi_notify_wq);
1812 BUG_ON(!kacpi_hotplug_wq);
1813 acpi_install_interface_handler(acpi_osi_handler);
1814 acpi_osi_setup_late();
1815 return AE_OK;
1816}
1817
1818acpi_status acpi_os_terminate(void)
1819{
1820 if (acpi_irq_handler) {
1821 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1822 acpi_irq_handler);
1823 }
1824
1825 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1826 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1827 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1828 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1829
1830 destroy_workqueue(kacpid_wq);
1831 destroy_workqueue(kacpi_notify_wq);
1832 destroy_workqueue(kacpi_hotplug_wq);
1833
1834 return AE_OK;
1835}
1836
1837acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1838 u32 pm1b_control)
1839{
1840 int rc = 0;
1841 if (__acpi_os_prepare_sleep)
1842 rc = __acpi_os_prepare_sleep(sleep_state,
1843 pm1a_control, pm1b_control);
1844 if (rc < 0)
1845 return AE_ERROR;
1846 else if (rc > 0)
1847 return AE_CTRL_SKIP;
1848
1849 return AE_OK;
1850}
1851
1852void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1853 u32 pm1a_ctrl, u32 pm1b_ctrl))
1854{
1855 __acpi_os_prepare_sleep = func;
1856}
1857
1858acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1859 u32 val_b)
1860{
1861 int rc = 0;
1862 if (__acpi_os_prepare_extended_sleep)
1863 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1864 val_a, val_b);
1865 if (rc < 0)
1866 return AE_ERROR;
1867 else if (rc > 0)
1868 return AE_CTRL_SKIP;
1869
1870 return AE_OK;
1871}
1872
1873void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1874 u32 val_a, u32 val_b))
1875{
1876 __acpi_os_prepare_extended_sleep = func;
1877}