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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#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/mm.h>
16#include <linux/highmem.h>
17#include <linux/lockdep.h>
18#include <linux/pci.h>
19#include <linux/interrupt.h>
20#include <linux/kmod.h>
21#include <linux/delay.h>
22#include <linux/workqueue.h>
23#include <linux/nmi.h>
24#include <linux/acpi.h>
25#include <linux/efi.h>
26#include <linux/ioport.h>
27#include <linux/list.h>
28#include <linux/jiffies.h>
29#include <linux/semaphore.h>
30#include <linux/security.h>
31
32#include <asm/io.h>
33#include <linux/uaccess.h>
34#include <linux/io-64-nonatomic-lo-hi.h>
35
36#include "acpica/accommon.h"
37#include "acpica/acnamesp.h"
38#include "internal.h"
39
40#define _COMPONENT ACPI_OS_SERVICES
41ACPI_MODULE_NAME("osl");
42
43struct acpi_os_dpc {
44 acpi_osd_exec_callback function;
45 void *context;
46 struct work_struct work;
47};
48
49#ifdef ENABLE_DEBUGGER
50#include <linux/kdb.h>
51
52/* stuff for debugger support */
53int acpi_in_debugger;
54EXPORT_SYMBOL(acpi_in_debugger);
55#endif /*ENABLE_DEBUGGER */
56
57static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
58 u32 pm1b_ctrl);
59static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
60 u32 val_b);
61
62static acpi_osd_handler acpi_irq_handler;
63static void *acpi_irq_context;
64static struct workqueue_struct *kacpid_wq;
65static struct workqueue_struct *kacpi_notify_wq;
66static struct workqueue_struct *kacpi_hotplug_wq;
67static bool acpi_os_initialized;
68unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
69bool acpi_permanent_mmap = false;
70
71/*
72 * This list of permanent mappings is for memory that may be accessed from
73 * interrupt context, where we can't do the ioremap().
74 */
75struct acpi_ioremap {
76 struct list_head list;
77 void __iomem *virt;
78 acpi_physical_address phys;
79 acpi_size size;
80 union {
81 unsigned long refcount;
82 struct rcu_work rwork;
83 } track;
84};
85
86static LIST_HEAD(acpi_ioremaps);
87static DEFINE_MUTEX(acpi_ioremap_lock);
88#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
89
90static void __init acpi_request_region (struct acpi_generic_address *gas,
91 unsigned int length, char *desc)
92{
93 u64 addr;
94
95 /* Handle possible alignment issues */
96 memcpy(&addr, &gas->address, sizeof(addr));
97 if (!addr || !length)
98 return;
99
100 /* Resources are never freed */
101 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
102 request_region(addr, length, desc);
103 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
104 request_mem_region(addr, length, desc);
105}
106
107static int __init acpi_reserve_resources(void)
108{
109 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
110 "ACPI PM1a_EVT_BLK");
111
112 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
113 "ACPI PM1b_EVT_BLK");
114
115 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
116 "ACPI PM1a_CNT_BLK");
117
118 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
119 "ACPI PM1b_CNT_BLK");
120
121 if (acpi_gbl_FADT.pm_timer_length == 4)
122 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
123
124 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
125 "ACPI PM2_CNT_BLK");
126
127 /* Length of GPE blocks must be a non-negative multiple of 2 */
128
129 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
130 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
131 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
132
133 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
134 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
135 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
136
137 return 0;
138}
139fs_initcall_sync(acpi_reserve_resources);
140
141void acpi_os_printf(const char *fmt, ...)
142{
143 va_list args;
144 va_start(args, fmt);
145 acpi_os_vprintf(fmt, args);
146 va_end(args);
147}
148EXPORT_SYMBOL(acpi_os_printf);
149
150void acpi_os_vprintf(const char *fmt, va_list args)
151{
152 static char buffer[512];
153
154 vsprintf(buffer, fmt, args);
155
156#ifdef ENABLE_DEBUGGER
157 if (acpi_in_debugger) {
158 kdb_printf("%s", buffer);
159 } else {
160 if (printk_get_level(buffer))
161 printk("%s", buffer);
162 else
163 printk(KERN_CONT "%s", buffer);
164 }
165#else
166 if (acpi_debugger_write_log(buffer) < 0) {
167 if (printk_get_level(buffer))
168 printk("%s", buffer);
169 else
170 printk(KERN_CONT "%s", buffer);
171 }
172#endif
173}
174
175#ifdef CONFIG_KEXEC
176static unsigned long acpi_rsdp;
177static int __init setup_acpi_rsdp(char *arg)
178{
179 return kstrtoul(arg, 16, &acpi_rsdp);
180}
181early_param("acpi_rsdp", setup_acpi_rsdp);
182#endif
183
184acpi_physical_address __init acpi_os_get_root_pointer(void)
185{
186 acpi_physical_address pa;
187
188#ifdef CONFIG_KEXEC
189 /*
190 * We may have been provided with an RSDP on the command line,
191 * but if a malicious user has done so they may be pointing us
192 * at modified ACPI tables that could alter kernel behaviour -
193 * so, we check the lockdown status before making use of
194 * it. If we trust it then also stash it in an architecture
195 * specific location (if appropriate) so it can be carried
196 * over further kexec()s.
197 */
198 if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
199 acpi_arch_set_root_pointer(acpi_rsdp);
200 return acpi_rsdp;
201 }
202#endif
203 pa = acpi_arch_get_root_pointer();
204 if (pa)
205 return pa;
206
207 if (efi_enabled(EFI_CONFIG_TABLES)) {
208 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
209 return efi.acpi20;
210 if (efi.acpi != EFI_INVALID_TABLE_ADDR)
211 return efi.acpi;
212 pr_err(PREFIX "System description tables not found\n");
213 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
214 acpi_find_root_pointer(&pa);
215 }
216
217 return pa;
218}
219
220/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
221static struct acpi_ioremap *
222acpi_map_lookup(acpi_physical_address phys, acpi_size size)
223{
224 struct acpi_ioremap *map;
225
226 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
227 if (map->phys <= phys &&
228 phys + size <= map->phys + map->size)
229 return map;
230
231 return NULL;
232}
233
234/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
235static void __iomem *
236acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
237{
238 struct acpi_ioremap *map;
239
240 map = acpi_map_lookup(phys, size);
241 if (map)
242 return map->virt + (phys - map->phys);
243
244 return NULL;
245}
246
247void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
248{
249 struct acpi_ioremap *map;
250 void __iomem *virt = NULL;
251
252 mutex_lock(&acpi_ioremap_lock);
253 map = acpi_map_lookup(phys, size);
254 if (map) {
255 virt = map->virt + (phys - map->phys);
256 map->track.refcount++;
257 }
258 mutex_unlock(&acpi_ioremap_lock);
259 return virt;
260}
261EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
262
263/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
264static struct acpi_ioremap *
265acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
266{
267 struct acpi_ioremap *map;
268
269 list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
270 if (map->virt <= virt &&
271 virt + size <= map->virt + map->size)
272 return map;
273
274 return NULL;
275}
276
277#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
278/* ioremap will take care of cache attributes */
279#define should_use_kmap(pfn) 0
280#else
281#define should_use_kmap(pfn) page_is_ram(pfn)
282#endif
283
284static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
285{
286 unsigned long pfn;
287
288 pfn = pg_off >> PAGE_SHIFT;
289 if (should_use_kmap(pfn)) {
290 if (pg_sz > PAGE_SIZE)
291 return NULL;
292 return (void __iomem __force *)kmap(pfn_to_page(pfn));
293 } else
294 return acpi_os_ioremap(pg_off, pg_sz);
295}
296
297static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
298{
299 unsigned long pfn;
300
301 pfn = pg_off >> PAGE_SHIFT;
302 if (should_use_kmap(pfn))
303 kunmap(pfn_to_page(pfn));
304 else
305 iounmap(vaddr);
306}
307
308/**
309 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
310 * @phys: Start of the physical address range to map.
311 * @size: Size of the physical address range to map.
312 *
313 * Look up the given physical address range in the list of existing ACPI memory
314 * mappings. If found, get a reference to it and return a pointer to it (its
315 * virtual address). If not found, map it, add it to that list and return a
316 * pointer to it.
317 *
318 * During early init (when acpi_permanent_mmap has not been set yet) this
319 * routine simply calls __acpi_map_table() to get the job done.
320 */
321void __iomem __ref
322*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
323{
324 struct acpi_ioremap *map;
325 void __iomem *virt;
326 acpi_physical_address pg_off;
327 acpi_size pg_sz;
328
329 if (phys > ULONG_MAX) {
330 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
331 return NULL;
332 }
333
334 if (!acpi_permanent_mmap)
335 return __acpi_map_table((unsigned long)phys, size);
336
337 mutex_lock(&acpi_ioremap_lock);
338 /* Check if there's a suitable mapping already. */
339 map = acpi_map_lookup(phys, size);
340 if (map) {
341 map->track.refcount++;
342 goto out;
343 }
344
345 map = kzalloc(sizeof(*map), GFP_KERNEL);
346 if (!map) {
347 mutex_unlock(&acpi_ioremap_lock);
348 return NULL;
349 }
350
351 pg_off = round_down(phys, PAGE_SIZE);
352 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
353 virt = acpi_map(phys, size);
354 if (!virt) {
355 mutex_unlock(&acpi_ioremap_lock);
356 kfree(map);
357 return NULL;
358 }
359
360 INIT_LIST_HEAD(&map->list);
361 map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
362 map->phys = pg_off;
363 map->size = pg_sz;
364 map->track.refcount = 1;
365
366 list_add_tail_rcu(&map->list, &acpi_ioremaps);
367
368out:
369 mutex_unlock(&acpi_ioremap_lock);
370 return map->virt + (phys - map->phys);
371}
372EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
373
374void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
375{
376 return (void *)acpi_os_map_iomem(phys, size);
377}
378EXPORT_SYMBOL_GPL(acpi_os_map_memory);
379
380static void acpi_os_map_remove(struct work_struct *work)
381{
382 struct acpi_ioremap *map = container_of(to_rcu_work(work),
383 struct acpi_ioremap,
384 track.rwork);
385
386 acpi_unmap(map->phys, map->virt);
387 kfree(map);
388}
389
390/* Must be called with mutex_lock(&acpi_ioremap_lock) */
391static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
392{
393 if (--map->track.refcount)
394 return;
395
396 list_del_rcu(&map->list);
397
398 INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
399 queue_rcu_work(system_wq, &map->track.rwork);
400}
401
402/**
403 * acpi_os_unmap_iomem - Drop a memory mapping reference.
404 * @virt: Start of the address range to drop a reference to.
405 * @size: Size of the address range to drop a reference to.
406 *
407 * Look up the given virtual address range in the list of existing ACPI memory
408 * mappings, drop a reference to it and if there are no more active references
409 * to it, queue it up for later removal.
410 *
411 * During early init (when acpi_permanent_mmap has not been set yet) this
412 * routine simply calls __acpi_unmap_table() to get the job done. Since
413 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
414 * here.
415 */
416void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
417{
418 struct acpi_ioremap *map;
419
420 if (!acpi_permanent_mmap) {
421 __acpi_unmap_table(virt, size);
422 return;
423 }
424
425 mutex_lock(&acpi_ioremap_lock);
426
427 map = acpi_map_lookup_virt(virt, size);
428 if (!map) {
429 mutex_unlock(&acpi_ioremap_lock);
430 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
431 return;
432 }
433 acpi_os_drop_map_ref(map);
434
435 mutex_unlock(&acpi_ioremap_lock);
436}
437EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
438
439/**
440 * acpi_os_unmap_memory - Drop a memory mapping reference.
441 * @virt: Start of the address range to drop a reference to.
442 * @size: Size of the address range to drop a reference to.
443 */
444void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
445{
446 acpi_os_unmap_iomem((void __iomem *)virt, size);
447}
448EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450int acpi_os_map_generic_address(struct acpi_generic_address *gas)
451{
452 u64 addr;
453 void __iomem *virt;
454
455 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
456 return 0;
457
458 /* Handle possible alignment issues */
459 memcpy(&addr, &gas->address, sizeof(addr));
460 if (!addr || !gas->bit_width)
461 return -EINVAL;
462
463 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
464 if (!virt)
465 return -EIO;
466
467 return 0;
468}
469EXPORT_SYMBOL(acpi_os_map_generic_address);
470
471void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
472{
473 u64 addr;
474 struct acpi_ioremap *map;
475
476 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
477 return;
478
479 /* Handle possible alignment issues */
480 memcpy(&addr, &gas->address, sizeof(addr));
481 if (!addr || !gas->bit_width)
482 return;
483
484 mutex_lock(&acpi_ioremap_lock);
485
486 map = acpi_map_lookup(addr, gas->bit_width / 8);
487 if (!map) {
488 mutex_unlock(&acpi_ioremap_lock);
489 return;
490 }
491 acpi_os_drop_map_ref(map);
492
493 mutex_unlock(&acpi_ioremap_lock);
494}
495EXPORT_SYMBOL(acpi_os_unmap_generic_address);
496
497#ifdef ACPI_FUTURE_USAGE
498acpi_status
499acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
500{
501 if (!phys || !virt)
502 return AE_BAD_PARAMETER;
503
504 *phys = virt_to_phys(virt);
505
506 return AE_OK;
507}
508#endif
509
510#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
511static bool acpi_rev_override;
512
513int __init acpi_rev_override_setup(char *str)
514{
515 acpi_rev_override = true;
516 return 1;
517}
518__setup("acpi_rev_override", acpi_rev_override_setup);
519#else
520#define acpi_rev_override false
521#endif
522
523#define ACPI_MAX_OVERRIDE_LEN 100
524
525static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
526
527acpi_status
528acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
529 acpi_string *new_val)
530{
531 if (!init_val || !new_val)
532 return AE_BAD_PARAMETER;
533
534 *new_val = NULL;
535 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
536 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
537 acpi_os_name);
538 *new_val = acpi_os_name;
539 }
540
541 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
542 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
543 *new_val = (char *)5;
544 }
545
546 return AE_OK;
547}
548
549static irqreturn_t acpi_irq(int irq, void *dev_id)
550{
551 u32 handled;
552
553 handled = (*acpi_irq_handler) (acpi_irq_context);
554
555 if (handled) {
556 acpi_irq_handled++;
557 return IRQ_HANDLED;
558 } else {
559 acpi_irq_not_handled++;
560 return IRQ_NONE;
561 }
562}
563
564acpi_status
565acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
566 void *context)
567{
568 unsigned int irq;
569
570 acpi_irq_stats_init();
571
572 /*
573 * ACPI interrupts different from the SCI in our copy of the FADT are
574 * not supported.
575 */
576 if (gsi != acpi_gbl_FADT.sci_interrupt)
577 return AE_BAD_PARAMETER;
578
579 if (acpi_irq_handler)
580 return AE_ALREADY_ACQUIRED;
581
582 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
583 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
584 gsi);
585 return AE_OK;
586 }
587
588 acpi_irq_handler = handler;
589 acpi_irq_context = context;
590 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
591 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
592 acpi_irq_handler = NULL;
593 return AE_NOT_ACQUIRED;
594 }
595 acpi_sci_irq = irq;
596
597 return AE_OK;
598}
599
600acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
601{
602 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
603 return AE_BAD_PARAMETER;
604
605 free_irq(acpi_sci_irq, acpi_irq);
606 acpi_irq_handler = NULL;
607 acpi_sci_irq = INVALID_ACPI_IRQ;
608
609 return AE_OK;
610}
611
612/*
613 * Running in interpreter thread context, safe to sleep
614 */
615
616void acpi_os_sleep(u64 ms)
617{
618 msleep(ms);
619}
620
621void acpi_os_stall(u32 us)
622{
623 while (us) {
624 u32 delay = 1000;
625
626 if (delay > us)
627 delay = us;
628 udelay(delay);
629 touch_nmi_watchdog();
630 us -= delay;
631 }
632}
633
634/*
635 * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
636 * monotonically increasing timer with 100ns granularity. Do not use
637 * ktime_get() to implement this function because this function may get
638 * called after timekeeping has been suspended. Note: calling this function
639 * after timekeeping has been suspended may lead to unexpected results
640 * because when timekeeping is suspended the jiffies counter is not
641 * incremented. See also timekeeping_suspend().
642 */
643u64 acpi_os_get_timer(void)
644{
645 return (get_jiffies_64() - INITIAL_JIFFIES) *
646 (ACPI_100NSEC_PER_SEC / HZ);
647}
648
649acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
650{
651 u32 dummy;
652
653 if (!value)
654 value = &dummy;
655
656 *value = 0;
657 if (width <= 8) {
658 *(u8 *) value = inb(port);
659 } else if (width <= 16) {
660 *(u16 *) value = inw(port);
661 } else if (width <= 32) {
662 *(u32 *) value = inl(port);
663 } else {
664 BUG();
665 }
666
667 return AE_OK;
668}
669
670EXPORT_SYMBOL(acpi_os_read_port);
671
672acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
673{
674 if (width <= 8) {
675 outb(value, port);
676 } else if (width <= 16) {
677 outw(value, port);
678 } else if (width <= 32) {
679 outl(value, port);
680 } else {
681 BUG();
682 }
683
684 return AE_OK;
685}
686
687EXPORT_SYMBOL(acpi_os_write_port);
688
689int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
690{
691
692 switch (width) {
693 case 8:
694 *(u8 *) value = readb(virt_addr);
695 break;
696 case 16:
697 *(u16 *) value = readw(virt_addr);
698 break;
699 case 32:
700 *(u32 *) value = readl(virt_addr);
701 break;
702 case 64:
703 *(u64 *) value = readq(virt_addr);
704 break;
705 default:
706 return -EINVAL;
707 }
708
709 return 0;
710}
711
712acpi_status
713acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
714{
715 void __iomem *virt_addr;
716 unsigned int size = width / 8;
717 bool unmap = false;
718 u64 dummy;
719 int error;
720
721 rcu_read_lock();
722 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
723 if (!virt_addr) {
724 rcu_read_unlock();
725 virt_addr = acpi_os_ioremap(phys_addr, size);
726 if (!virt_addr)
727 return AE_BAD_ADDRESS;
728 unmap = true;
729 }
730
731 if (!value)
732 value = &dummy;
733
734 error = acpi_os_read_iomem(virt_addr, value, width);
735 BUG_ON(error);
736
737 if (unmap)
738 iounmap(virt_addr);
739 else
740 rcu_read_unlock();
741
742 return AE_OK;
743}
744
745acpi_status
746acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
747{
748 void __iomem *virt_addr;
749 unsigned int size = width / 8;
750 bool unmap = false;
751
752 rcu_read_lock();
753 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
754 if (!virt_addr) {
755 rcu_read_unlock();
756 virt_addr = acpi_os_ioremap(phys_addr, size);
757 if (!virt_addr)
758 return AE_BAD_ADDRESS;
759 unmap = true;
760 }
761
762 switch (width) {
763 case 8:
764 writeb(value, virt_addr);
765 break;
766 case 16:
767 writew(value, virt_addr);
768 break;
769 case 32:
770 writel(value, virt_addr);
771 break;
772 case 64:
773 writeq(value, virt_addr);
774 break;
775 default:
776 BUG();
777 }
778
779 if (unmap)
780 iounmap(virt_addr);
781 else
782 rcu_read_unlock();
783
784 return AE_OK;
785}
786
787#ifdef CONFIG_PCI
788acpi_status
789acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
790 u64 *value, u32 width)
791{
792 int result, size;
793 u32 value32;
794
795 if (!value)
796 return AE_BAD_PARAMETER;
797
798 switch (width) {
799 case 8:
800 size = 1;
801 break;
802 case 16:
803 size = 2;
804 break;
805 case 32:
806 size = 4;
807 break;
808 default:
809 return AE_ERROR;
810 }
811
812 result = raw_pci_read(pci_id->segment, pci_id->bus,
813 PCI_DEVFN(pci_id->device, pci_id->function),
814 reg, size, &value32);
815 *value = value32;
816
817 return (result ? AE_ERROR : AE_OK);
818}
819
820acpi_status
821acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
822 u64 value, u32 width)
823{
824 int result, size;
825
826 switch (width) {
827 case 8:
828 size = 1;
829 break;
830 case 16:
831 size = 2;
832 break;
833 case 32:
834 size = 4;
835 break;
836 default:
837 return AE_ERROR;
838 }
839
840 result = raw_pci_write(pci_id->segment, pci_id->bus,
841 PCI_DEVFN(pci_id->device, pci_id->function),
842 reg, size, value);
843
844 return (result ? AE_ERROR : AE_OK);
845}
846#endif
847
848static void acpi_os_execute_deferred(struct work_struct *work)
849{
850 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
851
852 dpc->function(dpc->context);
853 kfree(dpc);
854}
855
856#ifdef CONFIG_ACPI_DEBUGGER
857static struct acpi_debugger acpi_debugger;
858static bool acpi_debugger_initialized;
859
860int acpi_register_debugger(struct module *owner,
861 const struct acpi_debugger_ops *ops)
862{
863 int ret = 0;
864
865 mutex_lock(&acpi_debugger.lock);
866 if (acpi_debugger.ops) {
867 ret = -EBUSY;
868 goto err_lock;
869 }
870
871 acpi_debugger.owner = owner;
872 acpi_debugger.ops = ops;
873
874err_lock:
875 mutex_unlock(&acpi_debugger.lock);
876 return ret;
877}
878EXPORT_SYMBOL(acpi_register_debugger);
879
880void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
881{
882 mutex_lock(&acpi_debugger.lock);
883 if (ops == acpi_debugger.ops) {
884 acpi_debugger.ops = NULL;
885 acpi_debugger.owner = NULL;
886 }
887 mutex_unlock(&acpi_debugger.lock);
888}
889EXPORT_SYMBOL(acpi_unregister_debugger);
890
891int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
892{
893 int ret;
894 int (*func)(acpi_osd_exec_callback, void *);
895 struct module *owner;
896
897 if (!acpi_debugger_initialized)
898 return -ENODEV;
899 mutex_lock(&acpi_debugger.lock);
900 if (!acpi_debugger.ops) {
901 ret = -ENODEV;
902 goto err_lock;
903 }
904 if (!try_module_get(acpi_debugger.owner)) {
905 ret = -ENODEV;
906 goto err_lock;
907 }
908 func = acpi_debugger.ops->create_thread;
909 owner = acpi_debugger.owner;
910 mutex_unlock(&acpi_debugger.lock);
911
912 ret = func(function, context);
913
914 mutex_lock(&acpi_debugger.lock);
915 module_put(owner);
916err_lock:
917 mutex_unlock(&acpi_debugger.lock);
918 return ret;
919}
920
921ssize_t acpi_debugger_write_log(const char *msg)
922{
923 ssize_t ret;
924 ssize_t (*func)(const char *);
925 struct module *owner;
926
927 if (!acpi_debugger_initialized)
928 return -ENODEV;
929 mutex_lock(&acpi_debugger.lock);
930 if (!acpi_debugger.ops) {
931 ret = -ENODEV;
932 goto err_lock;
933 }
934 if (!try_module_get(acpi_debugger.owner)) {
935 ret = -ENODEV;
936 goto err_lock;
937 }
938 func = acpi_debugger.ops->write_log;
939 owner = acpi_debugger.owner;
940 mutex_unlock(&acpi_debugger.lock);
941
942 ret = func(msg);
943
944 mutex_lock(&acpi_debugger.lock);
945 module_put(owner);
946err_lock:
947 mutex_unlock(&acpi_debugger.lock);
948 return ret;
949}
950
951ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
952{
953 ssize_t ret;
954 ssize_t (*func)(char *, size_t);
955 struct module *owner;
956
957 if (!acpi_debugger_initialized)
958 return -ENODEV;
959 mutex_lock(&acpi_debugger.lock);
960 if (!acpi_debugger.ops) {
961 ret = -ENODEV;
962 goto err_lock;
963 }
964 if (!try_module_get(acpi_debugger.owner)) {
965 ret = -ENODEV;
966 goto err_lock;
967 }
968 func = acpi_debugger.ops->read_cmd;
969 owner = acpi_debugger.owner;
970 mutex_unlock(&acpi_debugger.lock);
971
972 ret = func(buffer, buffer_length);
973
974 mutex_lock(&acpi_debugger.lock);
975 module_put(owner);
976err_lock:
977 mutex_unlock(&acpi_debugger.lock);
978 return ret;
979}
980
981int acpi_debugger_wait_command_ready(void)
982{
983 int ret;
984 int (*func)(bool, char *, size_t);
985 struct module *owner;
986
987 if (!acpi_debugger_initialized)
988 return -ENODEV;
989 mutex_lock(&acpi_debugger.lock);
990 if (!acpi_debugger.ops) {
991 ret = -ENODEV;
992 goto err_lock;
993 }
994 if (!try_module_get(acpi_debugger.owner)) {
995 ret = -ENODEV;
996 goto err_lock;
997 }
998 func = acpi_debugger.ops->wait_command_ready;
999 owner = acpi_debugger.owner;
1000 mutex_unlock(&acpi_debugger.lock);
1001
1002 ret = func(acpi_gbl_method_executing,
1003 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1004
1005 mutex_lock(&acpi_debugger.lock);
1006 module_put(owner);
1007err_lock:
1008 mutex_unlock(&acpi_debugger.lock);
1009 return ret;
1010}
1011
1012int acpi_debugger_notify_command_complete(void)
1013{
1014 int ret;
1015 int (*func)(void);
1016 struct module *owner;
1017
1018 if (!acpi_debugger_initialized)
1019 return -ENODEV;
1020 mutex_lock(&acpi_debugger.lock);
1021 if (!acpi_debugger.ops) {
1022 ret = -ENODEV;
1023 goto err_lock;
1024 }
1025 if (!try_module_get(acpi_debugger.owner)) {
1026 ret = -ENODEV;
1027 goto err_lock;
1028 }
1029 func = acpi_debugger.ops->notify_command_complete;
1030 owner = acpi_debugger.owner;
1031 mutex_unlock(&acpi_debugger.lock);
1032
1033 ret = func();
1034
1035 mutex_lock(&acpi_debugger.lock);
1036 module_put(owner);
1037err_lock:
1038 mutex_unlock(&acpi_debugger.lock);
1039 return ret;
1040}
1041
1042int __init acpi_debugger_init(void)
1043{
1044 mutex_init(&acpi_debugger.lock);
1045 acpi_debugger_initialized = true;
1046 return 0;
1047}
1048#endif
1049
1050/*******************************************************************************
1051 *
1052 * FUNCTION: acpi_os_execute
1053 *
1054 * PARAMETERS: Type - Type of the callback
1055 * Function - Function to be executed
1056 * Context - Function parameters
1057 *
1058 * RETURN: Status
1059 *
1060 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1061 * immediately executes function on a separate thread.
1062 *
1063 ******************************************************************************/
1064
1065acpi_status acpi_os_execute(acpi_execute_type type,
1066 acpi_osd_exec_callback function, void *context)
1067{
1068 acpi_status status = AE_OK;
1069 struct acpi_os_dpc *dpc;
1070 struct workqueue_struct *queue;
1071 int ret;
1072 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1073 "Scheduling function [%p(%p)] for deferred execution.\n",
1074 function, context));
1075
1076 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1077 ret = acpi_debugger_create_thread(function, context);
1078 if (ret) {
1079 pr_err("Call to kthread_create() failed.\n");
1080 status = AE_ERROR;
1081 }
1082 goto out_thread;
1083 }
1084
1085 /*
1086 * Allocate/initialize DPC structure. Note that this memory will be
1087 * freed by the callee. The kernel handles the work_struct list in a
1088 * way that allows us to also free its memory inside the callee.
1089 * Because we may want to schedule several tasks with different
1090 * parameters we can't use the approach some kernel code uses of
1091 * having a static work_struct.
1092 */
1093
1094 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1095 if (!dpc)
1096 return AE_NO_MEMORY;
1097
1098 dpc->function = function;
1099 dpc->context = context;
1100
1101 /*
1102 * To prevent lockdep from complaining unnecessarily, make sure that
1103 * there is a different static lockdep key for each workqueue by using
1104 * INIT_WORK() for each of them separately.
1105 */
1106 if (type == OSL_NOTIFY_HANDLER) {
1107 queue = kacpi_notify_wq;
1108 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1109 } else if (type == OSL_GPE_HANDLER) {
1110 queue = kacpid_wq;
1111 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1112 } else {
1113 pr_err("Unsupported os_execute type %d.\n", type);
1114 status = AE_ERROR;
1115 }
1116
1117 if (ACPI_FAILURE(status))
1118 goto err_workqueue;
1119
1120 /*
1121 * On some machines, a software-initiated SMI causes corruption unless
1122 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1123 * typically it's done in GPE-related methods that are run via
1124 * workqueues, so we can avoid the known corruption cases by always
1125 * queueing on CPU 0.
1126 */
1127 ret = queue_work_on(0, queue, &dpc->work);
1128 if (!ret) {
1129 printk(KERN_ERR PREFIX
1130 "Call to queue_work() failed.\n");
1131 status = AE_ERROR;
1132 }
1133err_workqueue:
1134 if (ACPI_FAILURE(status))
1135 kfree(dpc);
1136out_thread:
1137 return status;
1138}
1139EXPORT_SYMBOL(acpi_os_execute);
1140
1141void acpi_os_wait_events_complete(void)
1142{
1143 /*
1144 * Make sure the GPE handler or the fixed event handler is not used
1145 * on another CPU after removal.
1146 */
1147 if (acpi_sci_irq_valid())
1148 synchronize_hardirq(acpi_sci_irq);
1149 flush_workqueue(kacpid_wq);
1150 flush_workqueue(kacpi_notify_wq);
1151}
1152EXPORT_SYMBOL(acpi_os_wait_events_complete);
1153
1154struct acpi_hp_work {
1155 struct work_struct work;
1156 struct acpi_device *adev;
1157 u32 src;
1158};
1159
1160static void acpi_hotplug_work_fn(struct work_struct *work)
1161{
1162 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1163
1164 acpi_os_wait_events_complete();
1165 acpi_device_hotplug(hpw->adev, hpw->src);
1166 kfree(hpw);
1167}
1168
1169acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1170{
1171 struct acpi_hp_work *hpw;
1172
1173 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1174 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1175 adev, src));
1176
1177 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1178 if (!hpw)
1179 return AE_NO_MEMORY;
1180
1181 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1182 hpw->adev = adev;
1183 hpw->src = src;
1184 /*
1185 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1186 * the hotplug code may call driver .remove() functions, which may
1187 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1188 * these workqueues.
1189 */
1190 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1191 kfree(hpw);
1192 return AE_ERROR;
1193 }
1194 return AE_OK;
1195}
1196
1197bool acpi_queue_hotplug_work(struct work_struct *work)
1198{
1199 return queue_work(kacpi_hotplug_wq, work);
1200}
1201
1202acpi_status
1203acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1204{
1205 struct semaphore *sem = NULL;
1206
1207 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1208 if (!sem)
1209 return AE_NO_MEMORY;
1210
1211 sema_init(sem, initial_units);
1212
1213 *handle = (acpi_handle *) sem;
1214
1215 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1216 *handle, initial_units));
1217
1218 return AE_OK;
1219}
1220
1221/*
1222 * TODO: A better way to delete semaphores? Linux doesn't have a
1223 * 'delete_semaphore()' function -- may result in an invalid
1224 * pointer dereference for non-synchronized consumers. Should
1225 * we at least check for blocked threads and signal/cancel them?
1226 */
1227
1228acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1229{
1230 struct semaphore *sem = (struct semaphore *)handle;
1231
1232 if (!sem)
1233 return AE_BAD_PARAMETER;
1234
1235 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1236
1237 BUG_ON(!list_empty(&sem->wait_list));
1238 kfree(sem);
1239 sem = NULL;
1240
1241 return AE_OK;
1242}
1243
1244/*
1245 * TODO: Support for units > 1?
1246 */
1247acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1248{
1249 acpi_status status = AE_OK;
1250 struct semaphore *sem = (struct semaphore *)handle;
1251 long jiffies;
1252 int ret = 0;
1253
1254 if (!acpi_os_initialized)
1255 return AE_OK;
1256
1257 if (!sem || (units < 1))
1258 return AE_BAD_PARAMETER;
1259
1260 if (units > 1)
1261 return AE_SUPPORT;
1262
1263 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1264 handle, units, timeout));
1265
1266 if (timeout == ACPI_WAIT_FOREVER)
1267 jiffies = MAX_SCHEDULE_TIMEOUT;
1268 else
1269 jiffies = msecs_to_jiffies(timeout);
1270
1271 ret = down_timeout(sem, jiffies);
1272 if (ret)
1273 status = AE_TIME;
1274
1275 if (ACPI_FAILURE(status)) {
1276 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1277 "Failed to acquire semaphore[%p|%d|%d], %s",
1278 handle, units, timeout,
1279 acpi_format_exception(status)));
1280 } else {
1281 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1282 "Acquired semaphore[%p|%d|%d]", handle,
1283 units, timeout));
1284 }
1285
1286 return status;
1287}
1288
1289/*
1290 * TODO: Support for units > 1?
1291 */
1292acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1293{
1294 struct semaphore *sem = (struct semaphore *)handle;
1295
1296 if (!acpi_os_initialized)
1297 return AE_OK;
1298
1299 if (!sem || (units < 1))
1300 return AE_BAD_PARAMETER;
1301
1302 if (units > 1)
1303 return AE_SUPPORT;
1304
1305 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1306 units));
1307
1308 up(sem);
1309
1310 return AE_OK;
1311}
1312
1313acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1314{
1315#ifdef ENABLE_DEBUGGER
1316 if (acpi_in_debugger) {
1317 u32 chars;
1318
1319 kdb_read(buffer, buffer_length);
1320
1321 /* remove the CR kdb includes */
1322 chars = strlen(buffer) - 1;
1323 buffer[chars] = '\0';
1324 }
1325#else
1326 int ret;
1327
1328 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1329 if (ret < 0)
1330 return AE_ERROR;
1331 if (bytes_read)
1332 *bytes_read = ret;
1333#endif
1334
1335 return AE_OK;
1336}
1337EXPORT_SYMBOL(acpi_os_get_line);
1338
1339acpi_status acpi_os_wait_command_ready(void)
1340{
1341 int ret;
1342
1343 ret = acpi_debugger_wait_command_ready();
1344 if (ret < 0)
1345 return AE_ERROR;
1346 return AE_OK;
1347}
1348
1349acpi_status acpi_os_notify_command_complete(void)
1350{
1351 int ret;
1352
1353 ret = acpi_debugger_notify_command_complete();
1354 if (ret < 0)
1355 return AE_ERROR;
1356 return AE_OK;
1357}
1358
1359acpi_status acpi_os_signal(u32 function, void *info)
1360{
1361 switch (function) {
1362 case ACPI_SIGNAL_FATAL:
1363 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1364 break;
1365 case ACPI_SIGNAL_BREAKPOINT:
1366 /*
1367 * AML Breakpoint
1368 * ACPI spec. says to treat it as a NOP unless
1369 * you are debugging. So if/when we integrate
1370 * AML debugger into the kernel debugger its
1371 * hook will go here. But until then it is
1372 * not useful to print anything on breakpoints.
1373 */
1374 break;
1375 default:
1376 break;
1377 }
1378
1379 return AE_OK;
1380}
1381
1382static int __init acpi_os_name_setup(char *str)
1383{
1384 char *p = acpi_os_name;
1385 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1386
1387 if (!str || !*str)
1388 return 0;
1389
1390 for (; count-- && *str; str++) {
1391 if (isalnum(*str) || *str == ' ' || *str == ':')
1392 *p++ = *str;
1393 else if (*str == '\'' || *str == '"')
1394 continue;
1395 else
1396 break;
1397 }
1398 *p = 0;
1399
1400 return 1;
1401
1402}
1403
1404__setup("acpi_os_name=", acpi_os_name_setup);
1405
1406/*
1407 * Disable the auto-serialization of named objects creation methods.
1408 *
1409 * This feature is enabled by default. It marks the AML control methods
1410 * that contain the opcodes to create named objects as "Serialized".
1411 */
1412static int __init acpi_no_auto_serialize_setup(char *str)
1413{
1414 acpi_gbl_auto_serialize_methods = FALSE;
1415 pr_info("ACPI: auto-serialization disabled\n");
1416
1417 return 1;
1418}
1419
1420__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1421
1422/* Check of resource interference between native drivers and ACPI
1423 * OperationRegions (SystemIO and System Memory only).
1424 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1425 * in arbitrary AML code and can interfere with legacy drivers.
1426 * acpi_enforce_resources= can be set to:
1427 *
1428 * - strict (default) (2)
1429 * -> further driver trying to access the resources will not load
1430 * - lax (1)
1431 * -> further driver trying to access the resources will load, but you
1432 * get a system message that something might go wrong...
1433 *
1434 * - no (0)
1435 * -> ACPI Operation Region resources will not be registered
1436 *
1437 */
1438#define ENFORCE_RESOURCES_STRICT 2
1439#define ENFORCE_RESOURCES_LAX 1
1440#define ENFORCE_RESOURCES_NO 0
1441
1442static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1443
1444static int __init acpi_enforce_resources_setup(char *str)
1445{
1446 if (str == NULL || *str == '\0')
1447 return 0;
1448
1449 if (!strcmp("strict", str))
1450 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1451 else if (!strcmp("lax", str))
1452 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1453 else if (!strcmp("no", str))
1454 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1455
1456 return 1;
1457}
1458
1459__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1460
1461/* Check for resource conflicts between ACPI OperationRegions and native
1462 * drivers */
1463int acpi_check_resource_conflict(const struct resource *res)
1464{
1465 acpi_adr_space_type space_id;
1466 acpi_size length;
1467 u8 warn = 0;
1468 int clash = 0;
1469
1470 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1471 return 0;
1472 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1473 return 0;
1474
1475 if (res->flags & IORESOURCE_IO)
1476 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1477 else
1478 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1479
1480 length = resource_size(res);
1481 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1482 warn = 1;
1483 clash = acpi_check_address_range(space_id, res->start, length, warn);
1484
1485 if (clash) {
1486 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1487 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1488 printk(KERN_NOTICE "ACPI: This conflict may"
1489 " cause random problems and system"
1490 " instability\n");
1491 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1492 " for this device, you should use it instead of"
1493 " the native driver\n");
1494 }
1495 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1496 return -EBUSY;
1497 }
1498 return 0;
1499}
1500EXPORT_SYMBOL(acpi_check_resource_conflict);
1501
1502int acpi_check_region(resource_size_t start, resource_size_t n,
1503 const char *name)
1504{
1505 struct resource res = {
1506 .start = start,
1507 .end = start + n - 1,
1508 .name = name,
1509 .flags = IORESOURCE_IO,
1510 };
1511
1512 return acpi_check_resource_conflict(&res);
1513}
1514EXPORT_SYMBOL(acpi_check_region);
1515
1516static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
1517 void *_res, void **return_value)
1518{
1519 struct acpi_mem_space_context **mem_ctx;
1520 union acpi_operand_object *handler_obj;
1521 union acpi_operand_object *region_obj2;
1522 union acpi_operand_object *region_obj;
1523 struct resource *res = _res;
1524 acpi_status status;
1525
1526 region_obj = acpi_ns_get_attached_object(handle);
1527 if (!region_obj)
1528 return AE_OK;
1529
1530 handler_obj = region_obj->region.handler;
1531 if (!handler_obj)
1532 return AE_OK;
1533
1534 if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
1535 return AE_OK;
1536
1537 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
1538 return AE_OK;
1539
1540 region_obj2 = acpi_ns_get_secondary_object(region_obj);
1541 if (!region_obj2)
1542 return AE_OK;
1543
1544 mem_ctx = (void *)®ion_obj2->extra.region_context;
1545
1546 if (!(mem_ctx[0]->address >= res->start &&
1547 mem_ctx[0]->address < res->end))
1548 return AE_OK;
1549
1550 status = handler_obj->address_space.setup(region_obj,
1551 ACPI_REGION_DEACTIVATE,
1552 NULL, (void **)mem_ctx);
1553 if (ACPI_SUCCESS(status))
1554 region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
1555
1556 return status;
1557}
1558
1559/**
1560 * acpi_release_memory - Release any mappings done to a memory region
1561 * @handle: Handle to namespace node
1562 * @res: Memory resource
1563 * @level: A level that terminates the search
1564 *
1565 * Walks through @handle and unmaps all SystemMemory Operation Regions that
1566 * overlap with @res and that have already been activated (mapped).
1567 *
1568 * This is a helper that allows drivers to place special requirements on memory
1569 * region that may overlap with operation regions, primarily allowing them to
1570 * safely map the region as non-cached memory.
1571 *
1572 * The unmapped Operation Regions will be automatically remapped next time they
1573 * are called, so the drivers do not need to do anything else.
1574 */
1575acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
1576 u32 level)
1577{
1578 acpi_status status;
1579
1580 if (!(res->flags & IORESOURCE_MEM))
1581 return AE_TYPE;
1582
1583 status = acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
1584 acpi_deactivate_mem_region, NULL,
1585 res, NULL);
1586 if (ACPI_FAILURE(status))
1587 return status;
1588
1589 /*
1590 * Wait for all of the mappings queued up for removal by
1591 * acpi_deactivate_mem_region() to actually go away.
1592 */
1593 synchronize_rcu();
1594 rcu_barrier();
1595 flush_scheduled_work();
1596
1597 return AE_OK;
1598}
1599EXPORT_SYMBOL_GPL(acpi_release_memory);
1600
1601/*
1602 * Let drivers know whether the resource checks are effective
1603 */
1604int acpi_resources_are_enforced(void)
1605{
1606 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1607}
1608EXPORT_SYMBOL(acpi_resources_are_enforced);
1609
1610/*
1611 * Deallocate the memory for a spinlock.
1612 */
1613void acpi_os_delete_lock(acpi_spinlock handle)
1614{
1615 ACPI_FREE(handle);
1616}
1617
1618/*
1619 * Acquire a spinlock.
1620 *
1621 * handle is a pointer to the spinlock_t.
1622 */
1623
1624acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1625 __acquires(lockp)
1626{
1627 acpi_cpu_flags flags;
1628 spin_lock_irqsave(lockp, flags);
1629 return flags;
1630}
1631
1632/*
1633 * Release a spinlock. See above.
1634 */
1635
1636void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1637 __releases(lockp)
1638{
1639 spin_unlock_irqrestore(lockp, flags);
1640}
1641
1642#ifndef ACPI_USE_LOCAL_CACHE
1643
1644/*******************************************************************************
1645 *
1646 * FUNCTION: acpi_os_create_cache
1647 *
1648 * PARAMETERS: name - Ascii name for the cache
1649 * size - Size of each cached object
1650 * depth - Maximum depth of the cache (in objects) <ignored>
1651 * cache - Where the new cache object is returned
1652 *
1653 * RETURN: status
1654 *
1655 * DESCRIPTION: Create a cache object
1656 *
1657 ******************************************************************************/
1658
1659acpi_status
1660acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1661{
1662 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1663 if (*cache == NULL)
1664 return AE_ERROR;
1665 else
1666 return AE_OK;
1667}
1668
1669/*******************************************************************************
1670 *
1671 * FUNCTION: acpi_os_purge_cache
1672 *
1673 * PARAMETERS: Cache - Handle to cache object
1674 *
1675 * RETURN: Status
1676 *
1677 * DESCRIPTION: Free all objects within the requested cache.
1678 *
1679 ******************************************************************************/
1680
1681acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1682{
1683 kmem_cache_shrink(cache);
1684 return (AE_OK);
1685}
1686
1687/*******************************************************************************
1688 *
1689 * FUNCTION: acpi_os_delete_cache
1690 *
1691 * PARAMETERS: Cache - Handle to cache object
1692 *
1693 * RETURN: Status
1694 *
1695 * DESCRIPTION: Free all objects within the requested cache and delete the
1696 * cache object.
1697 *
1698 ******************************************************************************/
1699
1700acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1701{
1702 kmem_cache_destroy(cache);
1703 return (AE_OK);
1704}
1705
1706/*******************************************************************************
1707 *
1708 * FUNCTION: acpi_os_release_object
1709 *
1710 * PARAMETERS: Cache - Handle to cache object
1711 * Object - The object to be released
1712 *
1713 * RETURN: None
1714 *
1715 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1716 * the object is deleted.
1717 *
1718 ******************************************************************************/
1719
1720acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1721{
1722 kmem_cache_free(cache, object);
1723 return (AE_OK);
1724}
1725#endif
1726
1727static int __init acpi_no_static_ssdt_setup(char *s)
1728{
1729 acpi_gbl_disable_ssdt_table_install = TRUE;
1730 pr_info("ACPI: static SSDT installation disabled\n");
1731
1732 return 0;
1733}
1734
1735early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1736
1737static int __init acpi_disable_return_repair(char *s)
1738{
1739 printk(KERN_NOTICE PREFIX
1740 "ACPI: Predefined validation mechanism disabled\n");
1741 acpi_gbl_disable_auto_repair = TRUE;
1742
1743 return 1;
1744}
1745
1746__setup("acpica_no_return_repair", acpi_disable_return_repair);
1747
1748acpi_status __init acpi_os_initialize(void)
1749{
1750 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1751 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1752 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1753 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1754 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1755 /*
1756 * Use acpi_os_map_generic_address to pre-map the reset
1757 * register if it's in system memory.
1758 */
1759 int rv;
1760
1761 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1762 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1763 }
1764 acpi_os_initialized = true;
1765
1766 return AE_OK;
1767}
1768
1769acpi_status __init acpi_os_initialize1(void)
1770{
1771 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1772 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1773 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1774 BUG_ON(!kacpid_wq);
1775 BUG_ON(!kacpi_notify_wq);
1776 BUG_ON(!kacpi_hotplug_wq);
1777 acpi_osi_init();
1778 return AE_OK;
1779}
1780
1781acpi_status acpi_os_terminate(void)
1782{
1783 if (acpi_irq_handler) {
1784 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1785 acpi_irq_handler);
1786 }
1787
1788 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1789 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1790 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1791 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1792 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1793 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1794
1795 destroy_workqueue(kacpid_wq);
1796 destroy_workqueue(kacpi_notify_wq);
1797 destroy_workqueue(kacpi_hotplug_wq);
1798
1799 return AE_OK;
1800}
1801
1802acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1803 u32 pm1b_control)
1804{
1805 int rc = 0;
1806 if (__acpi_os_prepare_sleep)
1807 rc = __acpi_os_prepare_sleep(sleep_state,
1808 pm1a_control, pm1b_control);
1809 if (rc < 0)
1810 return AE_ERROR;
1811 else if (rc > 0)
1812 return AE_CTRL_TERMINATE;
1813
1814 return AE_OK;
1815}
1816
1817void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1818 u32 pm1a_ctrl, u32 pm1b_ctrl))
1819{
1820 __acpi_os_prepare_sleep = func;
1821}
1822
1823#if (ACPI_REDUCED_HARDWARE)
1824acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1825 u32 val_b)
1826{
1827 int rc = 0;
1828 if (__acpi_os_prepare_extended_sleep)
1829 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1830 val_a, val_b);
1831 if (rc < 0)
1832 return AE_ERROR;
1833 else if (rc > 0)
1834 return AE_CTRL_TERMINATE;
1835
1836 return AE_OK;
1837}
1838#else
1839acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1840 u32 val_b)
1841{
1842 return AE_OK;
1843}
1844#endif
1845
1846void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1847 u32 val_a, u32 val_b))
1848{
1849 __acpi_os_prepare_extended_sleep = func;
1850}
1851
1852acpi_status acpi_os_enter_sleep(u8 sleep_state,
1853 u32 reg_a_value, u32 reg_b_value)
1854{
1855 acpi_status status;
1856
1857 if (acpi_gbl_reduced_hardware)
1858 status = acpi_os_prepare_extended_sleep(sleep_state,
1859 reg_a_value,
1860 reg_b_value);
1861 else
1862 status = acpi_os_prepare_sleep(sleep_state,
1863 reg_a_value, reg_b_value);
1864 return status;
1865}
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}