Loading...
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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
4 *
5 * Copyright (C) 2000 Andrew Henroid
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 * Copyright (c) 2008 Intel Corporation
9 * Author: Matthew Wilcox <willy@linux.intel.com>
10 */
11
12#define pr_fmt(fmt) "ACPI: OSL: " fmt
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/mm.h>
18#include <linux/highmem.h>
19#include <linux/lockdep.h>
20#include <linux/pci.h>
21#include <linux/interrupt.h>
22#include <linux/kmod.h>
23#include <linux/delay.h>
24#include <linux/workqueue.h>
25#include <linux/nmi.h>
26#include <linux/acpi.h>
27#include <linux/efi.h>
28#include <linux/ioport.h>
29#include <linux/list.h>
30#include <linux/jiffies.h>
31#include <linux/semaphore.h>
32#include <linux/security.h>
33
34#include <asm/io.h>
35#include <linux/uaccess.h>
36#include <linux/io-64-nonatomic-lo-hi.h>
37
38#include "acpica/accommon.h"
39#include "internal.h"
40
41/* Definitions for ACPI_DEBUG_PRINT() */
42#define _COMPONENT ACPI_OS_SERVICES
43ACPI_MODULE_NAME("osl");
44
45struct acpi_os_dpc {
46 acpi_osd_exec_callback function;
47 void *context;
48 struct work_struct work;
49};
50
51#ifdef ENABLE_DEBUGGER
52#include <linux/kdb.h>
53
54/* stuff for debugger support */
55int acpi_in_debugger;
56EXPORT_SYMBOL(acpi_in_debugger);
57#endif /*ENABLE_DEBUGGER */
58
59static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
60 u32 pm1b_ctrl);
61static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
62 u32 val_b);
63
64static acpi_osd_handler acpi_irq_handler;
65static void *acpi_irq_context;
66static struct workqueue_struct *kacpid_wq;
67static struct workqueue_struct *kacpi_notify_wq;
68static struct workqueue_struct *kacpi_hotplug_wq;
69static bool acpi_os_initialized;
70unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
71bool acpi_permanent_mmap = false;
72
73/*
74 * This list of permanent mappings is for memory that may be accessed from
75 * interrupt context, where we can't do the ioremap().
76 */
77struct acpi_ioremap {
78 struct list_head list;
79 void __iomem *virt;
80 acpi_physical_address phys;
81 acpi_size size;
82 union {
83 unsigned long refcount;
84 struct rcu_work rwork;
85 } track;
86};
87
88static LIST_HEAD(acpi_ioremaps);
89static DEFINE_MUTEX(acpi_ioremap_lock);
90#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
91
92static void __init acpi_request_region (struct acpi_generic_address *gas,
93 unsigned int length, char *desc)
94{
95 u64 addr;
96
97 /* Handle possible alignment issues */
98 memcpy(&addr, &gas->address, sizeof(addr));
99 if (!addr || !length)
100 return;
101
102 /* Resources are never freed */
103 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
104 request_region(addr, length, desc);
105 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
106 request_mem_region(addr, length, desc);
107}
108
109static int __init acpi_reserve_resources(void)
110{
111 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
112 "ACPI PM1a_EVT_BLK");
113
114 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
115 "ACPI PM1b_EVT_BLK");
116
117 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
118 "ACPI PM1a_CNT_BLK");
119
120 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
121 "ACPI PM1b_CNT_BLK");
122
123 if (acpi_gbl_FADT.pm_timer_length == 4)
124 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
125
126 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
127 "ACPI PM2_CNT_BLK");
128
129 /* Length of GPE blocks must be a non-negative multiple of 2 */
130
131 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
132 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
133 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
134
135 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
136 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
137 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
138
139 return 0;
140}
141fs_initcall_sync(acpi_reserve_resources);
142
143void acpi_os_printf(const char *fmt, ...)
144{
145 va_list args;
146 va_start(args, fmt);
147 acpi_os_vprintf(fmt, args);
148 va_end(args);
149}
150EXPORT_SYMBOL(acpi_os_printf);
151
152void __printf(1, 0) acpi_os_vprintf(const char *fmt, va_list args)
153{
154 static char buffer[512];
155
156 vsprintf(buffer, fmt, args);
157
158#ifdef ENABLE_DEBUGGER
159 if (acpi_in_debugger) {
160 kdb_printf("%s", buffer);
161 } else {
162 if (printk_get_level(buffer))
163 printk("%s", buffer);
164 else
165 printk(KERN_CONT "%s", buffer);
166 }
167#else
168 if (acpi_debugger_write_log(buffer) < 0) {
169 if (printk_get_level(buffer))
170 printk("%s", buffer);
171 else
172 printk(KERN_CONT "%s", buffer);
173 }
174#endif
175}
176
177#ifdef CONFIG_KEXEC
178static unsigned long acpi_rsdp;
179static int __init setup_acpi_rsdp(char *arg)
180{
181 return kstrtoul(arg, 16, &acpi_rsdp);
182}
183early_param("acpi_rsdp", setup_acpi_rsdp);
184#endif
185
186acpi_physical_address __init acpi_os_get_root_pointer(void)
187{
188 acpi_physical_address pa;
189
190#ifdef CONFIG_KEXEC
191 /*
192 * We may have been provided with an RSDP on the command line,
193 * but if a malicious user has done so they may be pointing us
194 * at modified ACPI tables that could alter kernel behaviour -
195 * so, we check the lockdown status before making use of
196 * it. If we trust it then also stash it in an architecture
197 * specific location (if appropriate) so it can be carried
198 * over further kexec()s.
199 */
200 if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
201 acpi_arch_set_root_pointer(acpi_rsdp);
202 return acpi_rsdp;
203 }
204#endif
205 pa = acpi_arch_get_root_pointer();
206 if (pa)
207 return pa;
208
209 if (efi_enabled(EFI_CONFIG_TABLES)) {
210 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
211 return efi.acpi20;
212 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
213 return efi.acpi;
214 pr_err("System description tables not found\n");
215 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
216 acpi_find_root_pointer(&pa);
217 }
218
219 return pa;
220}
221
222/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
223static struct acpi_ioremap *
224acpi_map_lookup(acpi_physical_address phys, acpi_size size)
225{
226 struct acpi_ioremap *map;
227
228 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
229 if (map->phys <= phys &&
230 phys + size <= map->phys + map->size)
231 return map;
232
233 return NULL;
234}
235
236/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
237static void __iomem *
238acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
239{
240 struct acpi_ioremap *map;
241
242 map = acpi_map_lookup(phys, size);
243 if (map)
244 return map->virt + (phys - map->phys);
245
246 return NULL;
247}
248
249void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
250{
251 struct acpi_ioremap *map;
252 void __iomem *virt = NULL;
253
254 mutex_lock(&acpi_ioremap_lock);
255 map = acpi_map_lookup(phys, size);
256 if (map) {
257 virt = map->virt + (phys - map->phys);
258 map->track.refcount++;
259 }
260 mutex_unlock(&acpi_ioremap_lock);
261 return virt;
262}
263EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
264
265/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
266static struct acpi_ioremap *
267acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
268{
269 struct acpi_ioremap *map;
270
271 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
272 if (map->virt <= virt &&
273 virt + size <= map->virt + map->size)
274 return map;
275
276 return NULL;
277}
278
279#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
280/* ioremap will take care of cache attributes */
281#define should_use_kmap(pfn) 0
282#else
283#define should_use_kmap(pfn) page_is_ram(pfn)
284#endif
285
286static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
287{
288 unsigned long pfn;
289
290 pfn = pg_off >> PAGE_SHIFT;
291 if (should_use_kmap(pfn)) {
292 if (pg_sz > PAGE_SIZE)
293 return NULL;
294 return (void __iomem __force *)kmap(pfn_to_page(pfn));
295 } else
296 return acpi_os_ioremap(pg_off, pg_sz);
297}
298
299static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
300{
301 unsigned long pfn;
302
303 pfn = pg_off >> PAGE_SHIFT;
304 if (should_use_kmap(pfn))
305 kunmap(pfn_to_page(pfn));
306 else
307 iounmap(vaddr);
308}
309
310/**
311 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
312 * @phys: Start of the physical address range to map.
313 * @size: Size of the physical address range to map.
314 *
315 * Look up the given physical address range in the list of existing ACPI memory
316 * mappings. If found, get a reference to it and return a pointer to it (its
317 * virtual address). If not found, map it, add it to that list and return a
318 * pointer to it.
319 *
320 * During early init (when acpi_permanent_mmap has not been set yet) this
321 * routine simply calls __acpi_map_table() to get the job done.
322 */
323void __iomem __ref
324*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
325{
326 struct acpi_ioremap *map;
327 void __iomem *virt;
328 acpi_physical_address pg_off;
329 acpi_size pg_sz;
330
331 if (phys > ULONG_MAX) {
332 pr_err("Cannot map memory that high: 0x%llx\n", phys);
333 return NULL;
334 }
335
336 if (!acpi_permanent_mmap)
337 return __acpi_map_table((unsigned long)phys, size);
338
339 mutex_lock(&acpi_ioremap_lock);
340 /* Check if there's a suitable mapping already. */
341 map = acpi_map_lookup(phys, size);
342 if (map) {
343 map->track.refcount++;
344 goto out;
345 }
346
347 map = kzalloc(sizeof(*map), GFP_KERNEL);
348 if (!map) {
349 mutex_unlock(&acpi_ioremap_lock);
350 return NULL;
351 }
352
353 pg_off = round_down(phys, PAGE_SIZE);
354 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
355 virt = acpi_map(phys, size);
356 if (!virt) {
357 mutex_unlock(&acpi_ioremap_lock);
358 kfree(map);
359 return NULL;
360 }
361
362 INIT_LIST_HEAD(&map->list);
363 map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
364 map->phys = pg_off;
365 map->size = pg_sz;
366 map->track.refcount = 1;
367
368 list_add_tail_rcu(&map->list, &acpi_ioremaps);
369
370out:
371 mutex_unlock(&acpi_ioremap_lock);
372 return map->virt + (phys - map->phys);
373}
374EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
375
376void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
377{
378 return (void *)acpi_os_map_iomem(phys, size);
379}
380EXPORT_SYMBOL_GPL(acpi_os_map_memory);
381
382static void acpi_os_map_remove(struct work_struct *work)
383{
384 struct acpi_ioremap *map = container_of(to_rcu_work(work),
385 struct acpi_ioremap,
386 track.rwork);
387
388 acpi_unmap(map->phys, map->virt);
389 kfree(map);
390}
391
392/* Must be called with mutex_lock(&acpi_ioremap_lock) */
393static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
394{
395 if (--map->track.refcount)
396 return;
397
398 list_del_rcu(&map->list);
399
400 INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
401 queue_rcu_work(system_wq, &map->track.rwork);
402}
403
404/**
405 * acpi_os_unmap_iomem - Drop a memory mapping reference.
406 * @virt: Start of the address range to drop a reference to.
407 * @size: Size of the address range to drop a reference to.
408 *
409 * Look up the given virtual address range in the list of existing ACPI memory
410 * mappings, drop a reference to it and if there are no more active references
411 * to it, queue it up for later removal.
412 *
413 * During early init (when acpi_permanent_mmap has not been set yet) this
414 * routine simply calls __acpi_unmap_table() to get the job done. Since
415 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
416 * here.
417 */
418void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
419{
420 struct acpi_ioremap *map;
421
422 if (!acpi_permanent_mmap) {
423 __acpi_unmap_table(virt, size);
424 return;
425 }
426
427 mutex_lock(&acpi_ioremap_lock);
428
429 map = acpi_map_lookup_virt(virt, size);
430 if (!map) {
431 mutex_unlock(&acpi_ioremap_lock);
432 WARN(true, "ACPI: %s: bad address %p\n", __func__, virt);
433 return;
434 }
435 acpi_os_drop_map_ref(map);
436
437 mutex_unlock(&acpi_ioremap_lock);
438}
439EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
440
441/**
442 * acpi_os_unmap_memory - Drop a memory mapping reference.
443 * @virt: Start of the address range to drop a reference to.
444 * @size: Size of the address range to drop a reference to.
445 */
446void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
447{
448 acpi_os_unmap_iomem((void __iomem *)virt, size);
449}
450EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
451
452void __iomem *acpi_os_map_generic_address(struct acpi_generic_address *gas)
453{
454 u64 addr;
455
456 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
457 return NULL;
458
459 /* Handle possible alignment issues */
460 memcpy(&addr, &gas->address, sizeof(addr));
461 if (!addr || !gas->bit_width)
462 return NULL;
463
464 return acpi_os_map_iomem(addr, gas->bit_width / 8);
465}
466EXPORT_SYMBOL(acpi_os_map_generic_address);
467
468void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
469{
470 u64 addr;
471 struct acpi_ioremap *map;
472
473 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
474 return;
475
476 /* Handle possible alignment issues */
477 memcpy(&addr, &gas->address, sizeof(addr));
478 if (!addr || !gas->bit_width)
479 return;
480
481 mutex_lock(&acpi_ioremap_lock);
482
483 map = acpi_map_lookup(addr, gas->bit_width / 8);
484 if (!map) {
485 mutex_unlock(&acpi_ioremap_lock);
486 return;
487 }
488 acpi_os_drop_map_ref(map);
489
490 mutex_unlock(&acpi_ioremap_lock);
491}
492EXPORT_SYMBOL(acpi_os_unmap_generic_address);
493
494#ifdef ACPI_FUTURE_USAGE
495acpi_status
496acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
497{
498 if (!phys || !virt)
499 return AE_BAD_PARAMETER;
500
501 *phys = virt_to_phys(virt);
502
503 return AE_OK;
504}
505#endif
506
507#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
508static bool acpi_rev_override;
509
510int __init acpi_rev_override_setup(char *str)
511{
512 acpi_rev_override = true;
513 return 1;
514}
515__setup("acpi_rev_override", acpi_rev_override_setup);
516#else
517#define acpi_rev_override false
518#endif
519
520#define ACPI_MAX_OVERRIDE_LEN 100
521
522static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
523
524acpi_status
525acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
526 acpi_string *new_val)
527{
528 if (!init_val || !new_val)
529 return AE_BAD_PARAMETER;
530
531 *new_val = NULL;
532 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
533 pr_info("Overriding _OS definition to '%s'\n", acpi_os_name);
534 *new_val = acpi_os_name;
535 }
536
537 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
538 pr_info("Overriding _REV return value to 5\n");
539 *new_val = (char *)5;
540 }
541
542 return AE_OK;
543}
544
545static irqreturn_t acpi_irq(int irq, void *dev_id)
546{
547 if ((*acpi_irq_handler)(acpi_irq_context)) {
548 acpi_irq_handled++;
549 return IRQ_HANDLED;
550 } else {
551 acpi_irq_not_handled++;
552 return IRQ_NONE;
553 }
554}
555
556acpi_status
557acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
558 void *context)
559{
560 unsigned int irq;
561
562 acpi_irq_stats_init();
563
564 /*
565 * ACPI interrupts different from the SCI in our copy of the FADT are
566 * not supported.
567 */
568 if (gsi != acpi_gbl_FADT.sci_interrupt)
569 return AE_BAD_PARAMETER;
570
571 if (acpi_irq_handler)
572 return AE_ALREADY_ACQUIRED;
573
574 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
575 pr_err("SCI (ACPI GSI %d) not registered\n", gsi);
576 return AE_OK;
577 }
578
579 acpi_irq_handler = handler;
580 acpi_irq_context = context;
581 if (request_threaded_irq(irq, NULL, acpi_irq, IRQF_SHARED | IRQF_ONESHOT,
582 "acpi", acpi_irq)) {
583 pr_err("SCI (IRQ%d) allocation failed\n", irq);
584 acpi_irq_handler = NULL;
585 return AE_NOT_ACQUIRED;
586 }
587 acpi_sci_irq = irq;
588
589 return AE_OK;
590}
591
592acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
593{
594 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
595 return AE_BAD_PARAMETER;
596
597 free_irq(acpi_sci_irq, acpi_irq);
598 acpi_irq_handler = NULL;
599 acpi_sci_irq = INVALID_ACPI_IRQ;
600
601 return AE_OK;
602}
603
604/*
605 * Running in interpreter thread context, safe to sleep
606 */
607
608void acpi_os_sleep(u64 ms)
609{
610 msleep(ms);
611}
612
613void acpi_os_stall(u32 us)
614{
615 while (us) {
616 u32 delay = 1000;
617
618 if (delay > us)
619 delay = us;
620 udelay(delay);
621 touch_nmi_watchdog();
622 us -= delay;
623 }
624}
625
626/*
627 * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
628 * monotonically increasing timer with 100ns granularity. Do not use
629 * ktime_get() to implement this function because this function may get
630 * called after timekeeping has been suspended. Note: calling this function
631 * after timekeeping has been suspended may lead to unexpected results
632 * because when timekeeping is suspended the jiffies counter is not
633 * incremented. See also timekeeping_suspend().
634 */
635u64 acpi_os_get_timer(void)
636{
637 return (get_jiffies_64() - INITIAL_JIFFIES) *
638 (ACPI_100NSEC_PER_SEC / HZ);
639}
640
641acpi_status acpi_os_read_port(acpi_io_address port, u32 *value, u32 width)
642{
643 u32 dummy;
644
645 if (value)
646 *value = 0;
647 else
648 value = &dummy;
649
650 if (width <= 8) {
651 *value = inb(port);
652 } else if (width <= 16) {
653 *value = inw(port);
654 } else if (width <= 32) {
655 *value = inl(port);
656 } else {
657 pr_debug("%s: Access width %d not supported\n", __func__, width);
658 return AE_BAD_PARAMETER;
659 }
660
661 return AE_OK;
662}
663
664EXPORT_SYMBOL(acpi_os_read_port);
665
666acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
667{
668 if (width <= 8) {
669 outb(value, port);
670 } else if (width <= 16) {
671 outw(value, port);
672 } else if (width <= 32) {
673 outl(value, port);
674 } else {
675 pr_debug("%s: Access width %d not supported\n", __func__, width);
676 return AE_BAD_PARAMETER;
677 }
678
679 return AE_OK;
680}
681
682EXPORT_SYMBOL(acpi_os_write_port);
683
684int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
685{
686
687 switch (width) {
688 case 8:
689 *(u8 *) value = readb(virt_addr);
690 break;
691 case 16:
692 *(u16 *) value = readw(virt_addr);
693 break;
694 case 32:
695 *(u32 *) value = readl(virt_addr);
696 break;
697 case 64:
698 *(u64 *) value = readq(virt_addr);
699 break;
700 default:
701 return -EINVAL;
702 }
703
704 return 0;
705}
706
707acpi_status
708acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
709{
710 void __iomem *virt_addr;
711 unsigned int size = width / 8;
712 bool unmap = false;
713 u64 dummy;
714 int error;
715
716 rcu_read_lock();
717 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
718 if (!virt_addr) {
719 rcu_read_unlock();
720 virt_addr = acpi_os_ioremap(phys_addr, size);
721 if (!virt_addr)
722 return AE_BAD_ADDRESS;
723 unmap = true;
724 }
725
726 if (!value)
727 value = &dummy;
728
729 error = acpi_os_read_iomem(virt_addr, value, width);
730 BUG_ON(error);
731
732 if (unmap)
733 iounmap(virt_addr);
734 else
735 rcu_read_unlock();
736
737 return AE_OK;
738}
739
740acpi_status
741acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
742{
743 void __iomem *virt_addr;
744 unsigned int size = width / 8;
745 bool unmap = false;
746
747 rcu_read_lock();
748 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
749 if (!virt_addr) {
750 rcu_read_unlock();
751 virt_addr = acpi_os_ioremap(phys_addr, size);
752 if (!virt_addr)
753 return AE_BAD_ADDRESS;
754 unmap = true;
755 }
756
757 switch (width) {
758 case 8:
759 writeb(value, virt_addr);
760 break;
761 case 16:
762 writew(value, virt_addr);
763 break;
764 case 32:
765 writel(value, virt_addr);
766 break;
767 case 64:
768 writeq(value, virt_addr);
769 break;
770 default:
771 BUG();
772 }
773
774 if (unmap)
775 iounmap(virt_addr);
776 else
777 rcu_read_unlock();
778
779 return AE_OK;
780}
781
782#ifdef CONFIG_PCI
783acpi_status
784acpi_os_read_pci_configuration(struct acpi_pci_id *pci_id, u32 reg,
785 u64 *value, u32 width)
786{
787 int result, size;
788 u32 value32;
789
790 if (!value)
791 return AE_BAD_PARAMETER;
792
793 switch (width) {
794 case 8:
795 size = 1;
796 break;
797 case 16:
798 size = 2;
799 break;
800 case 32:
801 size = 4;
802 break;
803 default:
804 return AE_ERROR;
805 }
806
807 result = raw_pci_read(pci_id->segment, pci_id->bus,
808 PCI_DEVFN(pci_id->device, pci_id->function),
809 reg, size, &value32);
810 *value = value32;
811
812 return (result ? AE_ERROR : AE_OK);
813}
814
815acpi_status
816acpi_os_write_pci_configuration(struct acpi_pci_id *pci_id, u32 reg,
817 u64 value, u32 width)
818{
819 int result, size;
820
821 switch (width) {
822 case 8:
823 size = 1;
824 break;
825 case 16:
826 size = 2;
827 break;
828 case 32:
829 size = 4;
830 break;
831 default:
832 return AE_ERROR;
833 }
834
835 result = raw_pci_write(pci_id->segment, pci_id->bus,
836 PCI_DEVFN(pci_id->device, pci_id->function),
837 reg, size, value);
838
839 return (result ? AE_ERROR : AE_OK);
840}
841#endif
842
843static void acpi_os_execute_deferred(struct work_struct *work)
844{
845 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
846
847 dpc->function(dpc->context);
848 kfree(dpc);
849}
850
851#ifdef CONFIG_ACPI_DEBUGGER
852static struct acpi_debugger acpi_debugger;
853static bool acpi_debugger_initialized;
854
855int acpi_register_debugger(struct module *owner,
856 const struct acpi_debugger_ops *ops)
857{
858 int ret = 0;
859
860 mutex_lock(&acpi_debugger.lock);
861 if (acpi_debugger.ops) {
862 ret = -EBUSY;
863 goto err_lock;
864 }
865
866 acpi_debugger.owner = owner;
867 acpi_debugger.ops = ops;
868
869err_lock:
870 mutex_unlock(&acpi_debugger.lock);
871 return ret;
872}
873EXPORT_SYMBOL(acpi_register_debugger);
874
875void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
876{
877 mutex_lock(&acpi_debugger.lock);
878 if (ops == acpi_debugger.ops) {
879 acpi_debugger.ops = NULL;
880 acpi_debugger.owner = NULL;
881 }
882 mutex_unlock(&acpi_debugger.lock);
883}
884EXPORT_SYMBOL(acpi_unregister_debugger);
885
886int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
887{
888 int ret;
889 int (*func)(acpi_osd_exec_callback, void *);
890 struct module *owner;
891
892 if (!acpi_debugger_initialized)
893 return -ENODEV;
894 mutex_lock(&acpi_debugger.lock);
895 if (!acpi_debugger.ops) {
896 ret = -ENODEV;
897 goto err_lock;
898 }
899 if (!try_module_get(acpi_debugger.owner)) {
900 ret = -ENODEV;
901 goto err_lock;
902 }
903 func = acpi_debugger.ops->create_thread;
904 owner = acpi_debugger.owner;
905 mutex_unlock(&acpi_debugger.lock);
906
907 ret = func(function, context);
908
909 mutex_lock(&acpi_debugger.lock);
910 module_put(owner);
911err_lock:
912 mutex_unlock(&acpi_debugger.lock);
913 return ret;
914}
915
916ssize_t acpi_debugger_write_log(const char *msg)
917{
918 ssize_t ret;
919 ssize_t (*func)(const char *);
920 struct module *owner;
921
922 if (!acpi_debugger_initialized)
923 return -ENODEV;
924 mutex_lock(&acpi_debugger.lock);
925 if (!acpi_debugger.ops) {
926 ret = -ENODEV;
927 goto err_lock;
928 }
929 if (!try_module_get(acpi_debugger.owner)) {
930 ret = -ENODEV;
931 goto err_lock;
932 }
933 func = acpi_debugger.ops->write_log;
934 owner = acpi_debugger.owner;
935 mutex_unlock(&acpi_debugger.lock);
936
937 ret = func(msg);
938
939 mutex_lock(&acpi_debugger.lock);
940 module_put(owner);
941err_lock:
942 mutex_unlock(&acpi_debugger.lock);
943 return ret;
944}
945
946ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
947{
948 ssize_t ret;
949 ssize_t (*func)(char *, size_t);
950 struct module *owner;
951
952 if (!acpi_debugger_initialized)
953 return -ENODEV;
954 mutex_lock(&acpi_debugger.lock);
955 if (!acpi_debugger.ops) {
956 ret = -ENODEV;
957 goto err_lock;
958 }
959 if (!try_module_get(acpi_debugger.owner)) {
960 ret = -ENODEV;
961 goto err_lock;
962 }
963 func = acpi_debugger.ops->read_cmd;
964 owner = acpi_debugger.owner;
965 mutex_unlock(&acpi_debugger.lock);
966
967 ret = func(buffer, buffer_length);
968
969 mutex_lock(&acpi_debugger.lock);
970 module_put(owner);
971err_lock:
972 mutex_unlock(&acpi_debugger.lock);
973 return ret;
974}
975
976int acpi_debugger_wait_command_ready(void)
977{
978 int ret;
979 int (*func)(bool, char *, size_t);
980 struct module *owner;
981
982 if (!acpi_debugger_initialized)
983 return -ENODEV;
984 mutex_lock(&acpi_debugger.lock);
985 if (!acpi_debugger.ops) {
986 ret = -ENODEV;
987 goto err_lock;
988 }
989 if (!try_module_get(acpi_debugger.owner)) {
990 ret = -ENODEV;
991 goto err_lock;
992 }
993 func = acpi_debugger.ops->wait_command_ready;
994 owner = acpi_debugger.owner;
995 mutex_unlock(&acpi_debugger.lock);
996
997 ret = func(acpi_gbl_method_executing,
998 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
999
1000 mutex_lock(&acpi_debugger.lock);
1001 module_put(owner);
1002err_lock:
1003 mutex_unlock(&acpi_debugger.lock);
1004 return ret;
1005}
1006
1007int acpi_debugger_notify_command_complete(void)
1008{
1009 int ret;
1010 int (*func)(void);
1011 struct module *owner;
1012
1013 if (!acpi_debugger_initialized)
1014 return -ENODEV;
1015 mutex_lock(&acpi_debugger.lock);
1016 if (!acpi_debugger.ops) {
1017 ret = -ENODEV;
1018 goto err_lock;
1019 }
1020 if (!try_module_get(acpi_debugger.owner)) {
1021 ret = -ENODEV;
1022 goto err_lock;
1023 }
1024 func = acpi_debugger.ops->notify_command_complete;
1025 owner = acpi_debugger.owner;
1026 mutex_unlock(&acpi_debugger.lock);
1027
1028 ret = func();
1029
1030 mutex_lock(&acpi_debugger.lock);
1031 module_put(owner);
1032err_lock:
1033 mutex_unlock(&acpi_debugger.lock);
1034 return ret;
1035}
1036
1037int __init acpi_debugger_init(void)
1038{
1039 mutex_init(&acpi_debugger.lock);
1040 acpi_debugger_initialized = true;
1041 return 0;
1042}
1043#endif
1044
1045/*******************************************************************************
1046 *
1047 * FUNCTION: acpi_os_execute
1048 *
1049 * PARAMETERS: Type - Type of the callback
1050 * Function - Function to be executed
1051 * Context - Function parameters
1052 *
1053 * RETURN: Status
1054 *
1055 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1056 * immediately executes function on a separate thread.
1057 *
1058 ******************************************************************************/
1059
1060acpi_status acpi_os_execute(acpi_execute_type type,
1061 acpi_osd_exec_callback function, void *context)
1062{
1063 struct acpi_os_dpc *dpc;
1064 int ret;
1065
1066 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1067 "Scheduling function [%p(%p)] for deferred execution.\n",
1068 function, context));
1069
1070 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1071 ret = acpi_debugger_create_thread(function, context);
1072 if (ret) {
1073 pr_err("Kernel thread creation failed\n");
1074 return AE_ERROR;
1075 }
1076 return AE_OK;
1077 }
1078
1079 /*
1080 * Allocate/initialize DPC structure. Note that this memory will be
1081 * freed by the callee. The kernel handles the work_struct list in a
1082 * way that allows us to also free its memory inside the callee.
1083 * Because we may want to schedule several tasks with different
1084 * parameters we can't use the approach some kernel code uses of
1085 * having a static work_struct.
1086 */
1087
1088 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1089 if (!dpc)
1090 return AE_NO_MEMORY;
1091
1092 dpc->function = function;
1093 dpc->context = context;
1094 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1095
1096 /*
1097 * To prevent lockdep from complaining unnecessarily, make sure that
1098 * there is a different static lockdep key for each workqueue by using
1099 * INIT_WORK() for each of them separately.
1100 */
1101 switch (type) {
1102 case OSL_NOTIFY_HANDLER:
1103 ret = queue_work(kacpi_notify_wq, &dpc->work);
1104 break;
1105 case OSL_GPE_HANDLER:
1106 /*
1107 * On some machines, a software-initiated SMI causes corruption
1108 * unless the SMI runs on CPU 0. An SMI can be initiated by
1109 * any AML, but typically it's done in GPE-related methods that
1110 * are run via workqueues, so we can avoid the known corruption
1111 * cases by always queueing on CPU 0.
1112 */
1113 ret = queue_work_on(0, kacpid_wq, &dpc->work);
1114 break;
1115 default:
1116 pr_err("Unsupported os_execute type %d.\n", type);
1117 goto err;
1118 }
1119 if (!ret) {
1120 pr_err("Unable to queue work\n");
1121 goto err;
1122 }
1123
1124 return AE_OK;
1125
1126err:
1127 kfree(dpc);
1128 return AE_ERROR;
1129}
1130EXPORT_SYMBOL(acpi_os_execute);
1131
1132void acpi_os_wait_events_complete(void)
1133{
1134 /*
1135 * Make sure the GPE handler or the fixed event handler is not used
1136 * on another CPU after removal.
1137 */
1138 if (acpi_sci_irq_valid())
1139 synchronize_hardirq(acpi_sci_irq);
1140 flush_workqueue(kacpid_wq);
1141 flush_workqueue(kacpi_notify_wq);
1142}
1143EXPORT_SYMBOL(acpi_os_wait_events_complete);
1144
1145struct acpi_hp_work {
1146 struct work_struct work;
1147 struct acpi_device *adev;
1148 u32 src;
1149};
1150
1151static void acpi_hotplug_work_fn(struct work_struct *work)
1152{
1153 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1154
1155 acpi_os_wait_events_complete();
1156 acpi_device_hotplug(hpw->adev, hpw->src);
1157 kfree(hpw);
1158}
1159
1160acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1161{
1162 struct acpi_hp_work *hpw;
1163
1164 acpi_handle_debug(adev->handle,
1165 "Scheduling hotplug event %u for deferred handling\n",
1166 src);
1167
1168 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1169 if (!hpw)
1170 return AE_NO_MEMORY;
1171
1172 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1173 hpw->adev = adev;
1174 hpw->src = src;
1175 /*
1176 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1177 * the hotplug code may call driver .remove() functions, which may
1178 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1179 * these workqueues.
1180 */
1181 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1182 kfree(hpw);
1183 return AE_ERROR;
1184 }
1185 return AE_OK;
1186}
1187
1188bool acpi_queue_hotplug_work(struct work_struct *work)
1189{
1190 return queue_work(kacpi_hotplug_wq, work);
1191}
1192
1193acpi_status
1194acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle *handle)
1195{
1196 struct semaphore *sem = NULL;
1197
1198 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1199 if (!sem)
1200 return AE_NO_MEMORY;
1201
1202 sema_init(sem, initial_units);
1203
1204 *handle = (acpi_handle *) sem;
1205
1206 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1207 *handle, initial_units));
1208
1209 return AE_OK;
1210}
1211
1212/*
1213 * TODO: A better way to delete semaphores? Linux doesn't have a
1214 * 'delete_semaphore()' function -- may result in an invalid
1215 * pointer dereference for non-synchronized consumers. Should
1216 * we at least check for blocked threads and signal/cancel them?
1217 */
1218
1219acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1220{
1221 struct semaphore *sem = (struct semaphore *)handle;
1222
1223 if (!sem)
1224 return AE_BAD_PARAMETER;
1225
1226 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1227
1228 BUG_ON(!list_empty(&sem->wait_list));
1229 kfree(sem);
1230 sem = NULL;
1231
1232 return AE_OK;
1233}
1234
1235/*
1236 * TODO: Support for units > 1?
1237 */
1238acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1239{
1240 acpi_status status = AE_OK;
1241 struct semaphore *sem = (struct semaphore *)handle;
1242 long jiffies;
1243 int ret = 0;
1244
1245 if (!acpi_os_initialized)
1246 return AE_OK;
1247
1248 if (!sem || (units < 1))
1249 return AE_BAD_PARAMETER;
1250
1251 if (units > 1)
1252 return AE_SUPPORT;
1253
1254 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1255 handle, units, timeout));
1256
1257 if (timeout == ACPI_WAIT_FOREVER)
1258 jiffies = MAX_SCHEDULE_TIMEOUT;
1259 else
1260 jiffies = msecs_to_jiffies(timeout);
1261
1262 ret = down_timeout(sem, jiffies);
1263 if (ret)
1264 status = AE_TIME;
1265
1266 if (ACPI_FAILURE(status)) {
1267 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1268 "Failed to acquire semaphore[%p|%d|%d], %s",
1269 handle, units, timeout,
1270 acpi_format_exception(status)));
1271 } else {
1272 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1273 "Acquired semaphore[%p|%d|%d]", handle,
1274 units, timeout));
1275 }
1276
1277 return status;
1278}
1279
1280/*
1281 * TODO: Support for units > 1?
1282 */
1283acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1284{
1285 struct semaphore *sem = (struct semaphore *)handle;
1286
1287 if (!acpi_os_initialized)
1288 return AE_OK;
1289
1290 if (!sem || (units < 1))
1291 return AE_BAD_PARAMETER;
1292
1293 if (units > 1)
1294 return AE_SUPPORT;
1295
1296 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1297 units));
1298
1299 up(sem);
1300
1301 return AE_OK;
1302}
1303
1304acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1305{
1306#ifdef ENABLE_DEBUGGER
1307 if (acpi_in_debugger) {
1308 u32 chars;
1309
1310 kdb_read(buffer, buffer_length);
1311
1312 /* remove the CR kdb includes */
1313 chars = strlen(buffer) - 1;
1314 buffer[chars] = '\0';
1315 }
1316#else
1317 int ret;
1318
1319 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1320 if (ret < 0)
1321 return AE_ERROR;
1322 if (bytes_read)
1323 *bytes_read = ret;
1324#endif
1325
1326 return AE_OK;
1327}
1328EXPORT_SYMBOL(acpi_os_get_line);
1329
1330acpi_status acpi_os_wait_command_ready(void)
1331{
1332 int ret;
1333
1334 ret = acpi_debugger_wait_command_ready();
1335 if (ret < 0)
1336 return AE_ERROR;
1337 return AE_OK;
1338}
1339
1340acpi_status acpi_os_notify_command_complete(void)
1341{
1342 int ret;
1343
1344 ret = acpi_debugger_notify_command_complete();
1345 if (ret < 0)
1346 return AE_ERROR;
1347 return AE_OK;
1348}
1349
1350acpi_status acpi_os_signal(u32 function, void *info)
1351{
1352 switch (function) {
1353 case ACPI_SIGNAL_FATAL:
1354 pr_err("Fatal opcode executed\n");
1355 break;
1356 case ACPI_SIGNAL_BREAKPOINT:
1357 /*
1358 * AML Breakpoint
1359 * ACPI spec. says to treat it as a NOP unless
1360 * you are debugging. So if/when we integrate
1361 * AML debugger into the kernel debugger its
1362 * hook will go here. But until then it is
1363 * not useful to print anything on breakpoints.
1364 */
1365 break;
1366 default:
1367 break;
1368 }
1369
1370 return AE_OK;
1371}
1372
1373static int __init acpi_os_name_setup(char *str)
1374{
1375 char *p = acpi_os_name;
1376 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1377
1378 if (!str || !*str)
1379 return 0;
1380
1381 for (; count-- && *str; str++) {
1382 if (isalnum(*str) || *str == ' ' || *str == ':')
1383 *p++ = *str;
1384 else if (*str == '\'' || *str == '"')
1385 continue;
1386 else
1387 break;
1388 }
1389 *p = 0;
1390
1391 return 1;
1392
1393}
1394
1395__setup("acpi_os_name=", acpi_os_name_setup);
1396
1397/*
1398 * Disable the auto-serialization of named objects creation methods.
1399 *
1400 * This feature is enabled by default. It marks the AML control methods
1401 * that contain the opcodes to create named objects as "Serialized".
1402 */
1403static int __init acpi_no_auto_serialize_setup(char *str)
1404{
1405 acpi_gbl_auto_serialize_methods = FALSE;
1406 pr_info("Auto-serialization disabled\n");
1407
1408 return 1;
1409}
1410
1411__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1412
1413/* Check of resource interference between native drivers and ACPI
1414 * OperationRegions (SystemIO and System Memory only).
1415 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1416 * in arbitrary AML code and can interfere with legacy drivers.
1417 * acpi_enforce_resources= can be set to:
1418 *
1419 * - strict (default) (2)
1420 * -> further driver trying to access the resources will not load
1421 * - lax (1)
1422 * -> further driver trying to access the resources will load, but you
1423 * get a system message that something might go wrong...
1424 *
1425 * - no (0)
1426 * -> ACPI Operation Region resources will not be registered
1427 *
1428 */
1429#define ENFORCE_RESOURCES_STRICT 2
1430#define ENFORCE_RESOURCES_LAX 1
1431#define ENFORCE_RESOURCES_NO 0
1432
1433static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1434
1435static int __init acpi_enforce_resources_setup(char *str)
1436{
1437 if (str == NULL || *str == '\0')
1438 return 0;
1439
1440 if (!strcmp("strict", str))
1441 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1442 else if (!strcmp("lax", str))
1443 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1444 else if (!strcmp("no", str))
1445 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1446
1447 return 1;
1448}
1449
1450__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1451
1452/* Check for resource conflicts between ACPI OperationRegions and native
1453 * drivers */
1454int acpi_check_resource_conflict(const struct resource *res)
1455{
1456 acpi_adr_space_type space_id;
1457
1458 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1459 return 0;
1460
1461 if (res->flags & IORESOURCE_IO)
1462 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1463 else if (res->flags & IORESOURCE_MEM)
1464 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1465 else
1466 return 0;
1467
1468 if (!acpi_check_address_range(space_id, res->start, resource_size(res), 1))
1469 return 0;
1470
1471 pr_info("Resource conflict; ACPI support missing from driver?\n");
1472
1473 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1474 return -EBUSY;
1475
1476 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1477 pr_notice("Resource conflict: System may be unstable or behave erratically\n");
1478
1479 return 0;
1480}
1481EXPORT_SYMBOL(acpi_check_resource_conflict);
1482
1483int acpi_check_region(resource_size_t start, resource_size_t n,
1484 const char *name)
1485{
1486 struct resource res = DEFINE_RES_IO_NAMED(start, n, name);
1487
1488 return acpi_check_resource_conflict(&res);
1489}
1490EXPORT_SYMBOL(acpi_check_region);
1491
1492/*
1493 * Let drivers know whether the resource checks are effective
1494 */
1495int acpi_resources_are_enforced(void)
1496{
1497 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1498}
1499EXPORT_SYMBOL(acpi_resources_are_enforced);
1500
1501/*
1502 * Deallocate the memory for a spinlock.
1503 */
1504void acpi_os_delete_lock(acpi_spinlock handle)
1505{
1506 ACPI_FREE(handle);
1507}
1508
1509/*
1510 * Acquire a spinlock.
1511 *
1512 * handle is a pointer to the spinlock_t.
1513 */
1514
1515acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1516 __acquires(lockp)
1517{
1518 spin_lock(lockp);
1519 return 0;
1520}
1521
1522/*
1523 * Release a spinlock. See above.
1524 */
1525
1526void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags not_used)
1527 __releases(lockp)
1528{
1529 spin_unlock(lockp);
1530}
1531
1532#ifndef ACPI_USE_LOCAL_CACHE
1533
1534/*******************************************************************************
1535 *
1536 * FUNCTION: acpi_os_create_cache
1537 *
1538 * PARAMETERS: name - Ascii name for the cache
1539 * size - Size of each cached object
1540 * depth - Maximum depth of the cache (in objects) <ignored>
1541 * cache - Where the new cache object is returned
1542 *
1543 * RETURN: status
1544 *
1545 * DESCRIPTION: Create a cache object
1546 *
1547 ******************************************************************************/
1548
1549acpi_status
1550acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t **cache)
1551{
1552 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1553 if (*cache == NULL)
1554 return AE_ERROR;
1555 else
1556 return AE_OK;
1557}
1558
1559/*******************************************************************************
1560 *
1561 * FUNCTION: acpi_os_purge_cache
1562 *
1563 * PARAMETERS: Cache - Handle to cache object
1564 *
1565 * RETURN: Status
1566 *
1567 * DESCRIPTION: Free all objects within the requested cache.
1568 *
1569 ******************************************************************************/
1570
1571acpi_status acpi_os_purge_cache(acpi_cache_t *cache)
1572{
1573 kmem_cache_shrink(cache);
1574 return AE_OK;
1575}
1576
1577/*******************************************************************************
1578 *
1579 * FUNCTION: acpi_os_delete_cache
1580 *
1581 * PARAMETERS: Cache - Handle to cache object
1582 *
1583 * RETURN: Status
1584 *
1585 * DESCRIPTION: Free all objects within the requested cache and delete the
1586 * cache object.
1587 *
1588 ******************************************************************************/
1589
1590acpi_status acpi_os_delete_cache(acpi_cache_t *cache)
1591{
1592 kmem_cache_destroy(cache);
1593 return AE_OK;
1594}
1595
1596/*******************************************************************************
1597 *
1598 * FUNCTION: acpi_os_release_object
1599 *
1600 * PARAMETERS: Cache - Handle to cache object
1601 * Object - The object to be released
1602 *
1603 * RETURN: None
1604 *
1605 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1606 * the object is deleted.
1607 *
1608 ******************************************************************************/
1609
1610acpi_status acpi_os_release_object(acpi_cache_t *cache, void *object)
1611{
1612 kmem_cache_free(cache, object);
1613 return AE_OK;
1614}
1615#endif
1616
1617static int __init acpi_no_static_ssdt_setup(char *s)
1618{
1619 acpi_gbl_disable_ssdt_table_install = TRUE;
1620 pr_info("Static SSDT installation disabled\n");
1621
1622 return 0;
1623}
1624
1625early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1626
1627static int __init acpi_disable_return_repair(char *s)
1628{
1629 pr_notice("Predefined validation mechanism disabled\n");
1630 acpi_gbl_disable_auto_repair = TRUE;
1631
1632 return 1;
1633}
1634
1635__setup("acpica_no_return_repair", acpi_disable_return_repair);
1636
1637acpi_status __init acpi_os_initialize(void)
1638{
1639 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1640 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1641
1642 acpi_gbl_xgpe0_block_logical_address =
1643 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1644 acpi_gbl_xgpe1_block_logical_address =
1645 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1646
1647 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1648 /*
1649 * Use acpi_os_map_generic_address to pre-map the reset
1650 * register if it's in system memory.
1651 */
1652 void *rv;
1653
1654 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1655 pr_debug("%s: Reset register mapping %s\n", __func__,
1656 rv ? "successful" : "failed");
1657 }
1658 acpi_os_initialized = true;
1659
1660 return AE_OK;
1661}
1662
1663acpi_status __init acpi_os_initialize1(void)
1664{
1665 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1666 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 0);
1667 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1668 BUG_ON(!kacpid_wq);
1669 BUG_ON(!kacpi_notify_wq);
1670 BUG_ON(!kacpi_hotplug_wq);
1671 acpi_osi_init();
1672 return AE_OK;
1673}
1674
1675acpi_status acpi_os_terminate(void)
1676{
1677 if (acpi_irq_handler) {
1678 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1679 acpi_irq_handler);
1680 }
1681
1682 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1683 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1684 acpi_gbl_xgpe0_block_logical_address = 0UL;
1685 acpi_gbl_xgpe1_block_logical_address = 0UL;
1686
1687 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1688 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1689
1690 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1691 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1692
1693 destroy_workqueue(kacpid_wq);
1694 destroy_workqueue(kacpi_notify_wq);
1695 destroy_workqueue(kacpi_hotplug_wq);
1696
1697 return AE_OK;
1698}
1699
1700acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1701 u32 pm1b_control)
1702{
1703 int rc = 0;
1704
1705 if (__acpi_os_prepare_sleep)
1706 rc = __acpi_os_prepare_sleep(sleep_state,
1707 pm1a_control, pm1b_control);
1708 if (rc < 0)
1709 return AE_ERROR;
1710 else if (rc > 0)
1711 return AE_CTRL_TERMINATE;
1712
1713 return AE_OK;
1714}
1715
1716void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1717 u32 pm1a_ctrl, u32 pm1b_ctrl))
1718{
1719 __acpi_os_prepare_sleep = func;
1720}
1721
1722#if (ACPI_REDUCED_HARDWARE)
1723acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1724 u32 val_b)
1725{
1726 int rc = 0;
1727
1728 if (__acpi_os_prepare_extended_sleep)
1729 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1730 val_a, val_b);
1731 if (rc < 0)
1732 return AE_ERROR;
1733 else if (rc > 0)
1734 return AE_CTRL_TERMINATE;
1735
1736 return AE_OK;
1737}
1738#else
1739acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1740 u32 val_b)
1741{
1742 return AE_OK;
1743}
1744#endif
1745
1746void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1747 u32 val_a, u32 val_b))
1748{
1749 __acpi_os_prepare_extended_sleep = func;
1750}
1751
1752acpi_status acpi_os_enter_sleep(u8 sleep_state,
1753 u32 reg_a_value, u32 reg_b_value)
1754{
1755 acpi_status status;
1756
1757 if (acpi_gbl_reduced_hardware)
1758 status = acpi_os_prepare_extended_sleep(sleep_state,
1759 reg_a_value,
1760 reg_b_value);
1761 else
1762 status = acpi_os_prepare_sleep(sleep_state,
1763 reg_a_value, reg_b_value);
1764 return status;
1765}