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1/*
2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3 *
4 * Copyright (C) 2000 Andrew Henroid
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (c) 2008 Intel Corporation
8 * Author: Matthew Wilcox <willy@linux.intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 *
28 */
29
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/slab.h>
33#include <linux/mm.h>
34#include <linux/highmem.h>
35#include <linux/pci.h>
36#include <linux/interrupt.h>
37#include <linux/kmod.h>
38#include <linux/delay.h>
39#include <linux/workqueue.h>
40#include <linux/nmi.h>
41#include <linux/acpi.h>
42#include <linux/acpi_io.h>
43#include <linux/efi.h>
44#include <linux/ioport.h>
45#include <linux/list.h>
46#include <linux/jiffies.h>
47#include <linux/semaphore.h>
48
49#include <asm/io.h>
50#include <asm/uaccess.h>
51
52#include <acpi/acpi.h>
53#include <acpi/acpi_bus.h>
54#include <acpi/processor.h>
55
56#define _COMPONENT ACPI_OS_SERVICES
57ACPI_MODULE_NAME("osl");
58#define PREFIX "ACPI: "
59struct acpi_os_dpc {
60 acpi_osd_exec_callback function;
61 void *context;
62 struct work_struct work;
63 int wait;
64};
65
66#ifdef CONFIG_ACPI_CUSTOM_DSDT
67#include CONFIG_ACPI_CUSTOM_DSDT_FILE
68#endif
69
70#ifdef ENABLE_DEBUGGER
71#include <linux/kdb.h>
72
73/* stuff for debugger support */
74int acpi_in_debugger;
75EXPORT_SYMBOL(acpi_in_debugger);
76
77extern char line_buf[80];
78#endif /*ENABLE_DEBUGGER */
79
80static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81 u32 pm1b_ctrl);
82
83static acpi_osd_handler acpi_irq_handler;
84static void *acpi_irq_context;
85static struct workqueue_struct *kacpid_wq;
86static struct workqueue_struct *kacpi_notify_wq;
87struct workqueue_struct *kacpi_hotplug_wq;
88EXPORT_SYMBOL(kacpi_hotplug_wq);
89
90/*
91 * This list of permanent mappings is for memory that may be accessed from
92 * interrupt context, where we can't do the ioremap().
93 */
94struct acpi_ioremap {
95 struct list_head list;
96 void __iomem *virt;
97 acpi_physical_address phys;
98 acpi_size size;
99 unsigned long refcount;
100};
101
102static LIST_HEAD(acpi_ioremaps);
103static DEFINE_MUTEX(acpi_ioremap_lock);
104
105static void __init acpi_osi_setup_late(void);
106
107/*
108 * The story of _OSI(Linux)
109 *
110 * From pre-history through Linux-2.6.22,
111 * Linux responded TRUE upon a BIOS OSI(Linux) query.
112 *
113 * Unfortunately, reference BIOS writers got wind of this
114 * and put OSI(Linux) in their example code, quickly exposing
115 * this string as ill-conceived and opening the door to
116 * an un-bounded number of BIOS incompatibilities.
117 *
118 * For example, OSI(Linux) was used on resume to re-POST a
119 * video card on one system, because Linux at that time
120 * could not do a speedy restore in its native driver.
121 * But then upon gaining quick native restore capability,
122 * Linux has no way to tell the BIOS to skip the time-consuming
123 * POST -- putting Linux at a permanent performance disadvantage.
124 * On another system, the BIOS writer used OSI(Linux)
125 * to infer native OS support for IPMI! On other systems,
126 * OSI(Linux) simply got in the way of Linux claiming to
127 * be compatible with other operating systems, exposing
128 * BIOS issues such as skipped device initialization.
129 *
130 * So "Linux" turned out to be a really poor chose of
131 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132 *
133 * BIOS writers should NOT query _OSI(Linux) on future systems.
134 * Linux will complain on the console when it sees it, and return FALSE.
135 * To get Linux to return TRUE for your system will require
136 * a kernel source update to add a DMI entry,
137 * or boot with "acpi_osi=Linux"
138 */
139
140static struct osi_linux {
141 unsigned int enable:1;
142 unsigned int dmi:1;
143 unsigned int cmdline:1;
144} osi_linux = {0, 0, 0};
145
146static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147{
148 if (!strcmp("Linux", interface)) {
149
150 printk_once(KERN_NOTICE FW_BUG PREFIX
151 "BIOS _OSI(Linux) query %s%s\n",
152 osi_linux.enable ? "honored" : "ignored",
153 osi_linux.cmdline ? " via cmdline" :
154 osi_linux.dmi ? " via DMI" : "");
155 }
156
157 return supported;
158}
159
160static void __init acpi_request_region (struct acpi_generic_address *gas,
161 unsigned int length, char *desc)
162{
163 u64 addr;
164
165 /* Handle possible alignment issues */
166 memcpy(&addr, &gas->address, sizeof(addr));
167 if (!addr || !length)
168 return;
169
170 /* Resources are never freed */
171 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
172 request_region(addr, length, desc);
173 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
174 request_mem_region(addr, length, desc);
175}
176
177static int __init acpi_reserve_resources(void)
178{
179 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
180 "ACPI PM1a_EVT_BLK");
181
182 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
183 "ACPI PM1b_EVT_BLK");
184
185 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
186 "ACPI PM1a_CNT_BLK");
187
188 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
189 "ACPI PM1b_CNT_BLK");
190
191 if (acpi_gbl_FADT.pm_timer_length == 4)
192 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193
194 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
195 "ACPI PM2_CNT_BLK");
196
197 /* Length of GPE blocks must be a non-negative multiple of 2 */
198
199 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
200 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
201 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202
203 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
204 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
205 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206
207 return 0;
208}
209device_initcall(acpi_reserve_resources);
210
211void acpi_os_printf(const char *fmt, ...)
212{
213 va_list args;
214 va_start(args, fmt);
215 acpi_os_vprintf(fmt, args);
216 va_end(args);
217}
218
219void acpi_os_vprintf(const char *fmt, va_list args)
220{
221 static char buffer[512];
222
223 vsprintf(buffer, fmt, args);
224
225#ifdef ENABLE_DEBUGGER
226 if (acpi_in_debugger) {
227 kdb_printf("%s", buffer);
228 } else {
229 printk(KERN_CONT "%s", buffer);
230 }
231#else
232 printk(KERN_CONT "%s", buffer);
233#endif
234}
235
236#ifdef CONFIG_KEXEC
237static unsigned long acpi_rsdp;
238static int __init setup_acpi_rsdp(char *arg)
239{
240 acpi_rsdp = simple_strtoul(arg, NULL, 16);
241 return 0;
242}
243early_param("acpi_rsdp", setup_acpi_rsdp);
244#endif
245
246acpi_physical_address __init acpi_os_get_root_pointer(void)
247{
248#ifdef CONFIG_KEXEC
249 if (acpi_rsdp)
250 return acpi_rsdp;
251#endif
252
253 if (efi_enabled) {
254 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
255 return efi.acpi20;
256 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
257 return efi.acpi;
258 else {
259 printk(KERN_ERR PREFIX
260 "System description tables not found\n");
261 return 0;
262 }
263 } else {
264 acpi_physical_address pa = 0;
265
266 acpi_find_root_pointer(&pa);
267 return pa;
268 }
269}
270
271/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272static struct acpi_ioremap *
273acpi_map_lookup(acpi_physical_address phys, acpi_size size)
274{
275 struct acpi_ioremap *map;
276
277 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
278 if (map->phys <= phys &&
279 phys + size <= map->phys + map->size)
280 return map;
281
282 return NULL;
283}
284
285/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286static void __iomem *
287acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
288{
289 struct acpi_ioremap *map;
290
291 map = acpi_map_lookup(phys, size);
292 if (map)
293 return map->virt + (phys - map->phys);
294
295 return NULL;
296}
297
298void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
299{
300 struct acpi_ioremap *map;
301 void __iomem *virt = NULL;
302
303 mutex_lock(&acpi_ioremap_lock);
304 map = acpi_map_lookup(phys, size);
305 if (map) {
306 virt = map->virt + (phys - map->phys);
307 map->refcount++;
308 }
309 mutex_unlock(&acpi_ioremap_lock);
310 return virt;
311}
312EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
313
314/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315static struct acpi_ioremap *
316acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
317{
318 struct acpi_ioremap *map;
319
320 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
321 if (map->virt <= virt &&
322 virt + size <= map->virt + map->size)
323 return map;
324
325 return NULL;
326}
327
328#ifndef CONFIG_IA64
329#define should_use_kmap(pfn) page_is_ram(pfn)
330#else
331/* ioremap will take care of cache attributes */
332#define should_use_kmap(pfn) 0
333#endif
334
335static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336{
337 unsigned long pfn;
338
339 pfn = pg_off >> PAGE_SHIFT;
340 if (should_use_kmap(pfn)) {
341 if (pg_sz > PAGE_SIZE)
342 return NULL;
343 return (void __iomem __force *)kmap(pfn_to_page(pfn));
344 } else
345 return acpi_os_ioremap(pg_off, pg_sz);
346}
347
348static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349{
350 unsigned long pfn;
351
352 pfn = pg_off >> PAGE_SHIFT;
353 if (should_use_kmap(pfn))
354 kunmap(pfn_to_page(pfn));
355 else
356 iounmap(vaddr);
357}
358
359void __iomem *__init_refok
360acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
361{
362 struct acpi_ioremap *map;
363 void __iomem *virt;
364 acpi_physical_address pg_off;
365 acpi_size pg_sz;
366
367 if (phys > ULONG_MAX) {
368 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369 return NULL;
370 }
371
372 if (!acpi_gbl_permanent_mmap)
373 return __acpi_map_table((unsigned long)phys, size);
374
375 mutex_lock(&acpi_ioremap_lock);
376 /* Check if there's a suitable mapping already. */
377 map = acpi_map_lookup(phys, size);
378 if (map) {
379 map->refcount++;
380 goto out;
381 }
382
383 map = kzalloc(sizeof(*map), GFP_KERNEL);
384 if (!map) {
385 mutex_unlock(&acpi_ioremap_lock);
386 return NULL;
387 }
388
389 pg_off = round_down(phys, PAGE_SIZE);
390 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
391 virt = acpi_map(pg_off, pg_sz);
392 if (!virt) {
393 mutex_unlock(&acpi_ioremap_lock);
394 kfree(map);
395 return NULL;
396 }
397
398 INIT_LIST_HEAD(&map->list);
399 map->virt = virt;
400 map->phys = pg_off;
401 map->size = pg_sz;
402 map->refcount = 1;
403
404 list_add_tail_rcu(&map->list, &acpi_ioremaps);
405
406 out:
407 mutex_unlock(&acpi_ioremap_lock);
408 return map->virt + (phys - map->phys);
409}
410EXPORT_SYMBOL_GPL(acpi_os_map_memory);
411
412static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
413{
414 if (!--map->refcount)
415 list_del_rcu(&map->list);
416}
417
418static void acpi_os_map_cleanup(struct acpi_ioremap *map)
419{
420 if (!map->refcount) {
421 synchronize_rcu();
422 acpi_unmap(map->phys, map->virt);
423 kfree(map);
424 }
425}
426
427void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
428{
429 struct acpi_ioremap *map;
430
431 if (!acpi_gbl_permanent_mmap) {
432 __acpi_unmap_table(virt, size);
433 return;
434 }
435
436 mutex_lock(&acpi_ioremap_lock);
437 map = acpi_map_lookup_virt(virt, size);
438 if (!map) {
439 mutex_unlock(&acpi_ioremap_lock);
440 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
441 return;
442 }
443 acpi_os_drop_map_ref(map);
444 mutex_unlock(&acpi_ioremap_lock);
445
446 acpi_os_map_cleanup(map);
447}
448EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
451{
452 if (!acpi_gbl_permanent_mmap)
453 __acpi_unmap_table(virt, size);
454}
455
456int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457{
458 u64 addr;
459 void __iomem *virt;
460
461 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462 return 0;
463
464 /* Handle possible alignment issues */
465 memcpy(&addr, &gas->address, sizeof(addr));
466 if (!addr || !gas->bit_width)
467 return -EINVAL;
468
469 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
470 if (!virt)
471 return -EIO;
472
473 return 0;
474}
475EXPORT_SYMBOL(acpi_os_map_generic_address);
476
477void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
478{
479 u64 addr;
480 struct acpi_ioremap *map;
481
482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 return;
484
485 /* Handle possible alignment issues */
486 memcpy(&addr, &gas->address, sizeof(addr));
487 if (!addr || !gas->bit_width)
488 return;
489
490 mutex_lock(&acpi_ioremap_lock);
491 map = acpi_map_lookup(addr, gas->bit_width / 8);
492 if (!map) {
493 mutex_unlock(&acpi_ioremap_lock);
494 return;
495 }
496 acpi_os_drop_map_ref(map);
497 mutex_unlock(&acpi_ioremap_lock);
498
499 acpi_os_map_cleanup(map);
500}
501EXPORT_SYMBOL(acpi_os_unmap_generic_address);
502
503#ifdef ACPI_FUTURE_USAGE
504acpi_status
505acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
506{
507 if (!phys || !virt)
508 return AE_BAD_PARAMETER;
509
510 *phys = virt_to_phys(virt);
511
512 return AE_OK;
513}
514#endif
515
516#define ACPI_MAX_OVERRIDE_LEN 100
517
518static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519
520acpi_status
521acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
522 acpi_string * new_val)
523{
524 if (!init_val || !new_val)
525 return AE_BAD_PARAMETER;
526
527 *new_val = NULL;
528 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
529 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
530 acpi_os_name);
531 *new_val = acpi_os_name;
532 }
533
534 return AE_OK;
535}
536
537acpi_status
538acpi_os_table_override(struct acpi_table_header * existing_table,
539 struct acpi_table_header ** new_table)
540{
541 if (!existing_table || !new_table)
542 return AE_BAD_PARAMETER;
543
544 *new_table = NULL;
545
546#ifdef CONFIG_ACPI_CUSTOM_DSDT
547 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
548 *new_table = (struct acpi_table_header *)AmlCode;
549#endif
550 if (*new_table != NULL) {
551 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
552 "this is unsafe: tainting kernel\n",
553 existing_table->signature,
554 existing_table->oem_table_id);
555 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
556 }
557 return AE_OK;
558}
559
560acpi_status
561acpi_os_physical_table_override(struct acpi_table_header *existing_table,
562 acpi_physical_address * new_address,
563 u32 *new_table_length)
564{
565 return AE_SUPPORT;
566}
567
568
569static irqreturn_t acpi_irq(int irq, void *dev_id)
570{
571 u32 handled;
572
573 handled = (*acpi_irq_handler) (acpi_irq_context);
574
575 if (handled) {
576 acpi_irq_handled++;
577 return IRQ_HANDLED;
578 } else {
579 acpi_irq_not_handled++;
580 return IRQ_NONE;
581 }
582}
583
584acpi_status
585acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
586 void *context)
587{
588 unsigned int irq;
589
590 acpi_irq_stats_init();
591
592 /*
593 * ACPI interrupts different from the SCI in our copy of the FADT are
594 * not supported.
595 */
596 if (gsi != acpi_gbl_FADT.sci_interrupt)
597 return AE_BAD_PARAMETER;
598
599 if (acpi_irq_handler)
600 return AE_ALREADY_ACQUIRED;
601
602 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
603 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
604 gsi);
605 return AE_OK;
606 }
607
608 acpi_irq_handler = handler;
609 acpi_irq_context = context;
610 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
611 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
612 acpi_irq_handler = NULL;
613 return AE_NOT_ACQUIRED;
614 }
615
616 return AE_OK;
617}
618
619acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
620{
621 if (irq != acpi_gbl_FADT.sci_interrupt)
622 return AE_BAD_PARAMETER;
623
624 free_irq(irq, acpi_irq);
625 acpi_irq_handler = NULL;
626
627 return AE_OK;
628}
629
630/*
631 * Running in interpreter thread context, safe to sleep
632 */
633
634void acpi_os_sleep(u64 ms)
635{
636 schedule_timeout_interruptible(msecs_to_jiffies(ms));
637}
638
639void acpi_os_stall(u32 us)
640{
641 while (us) {
642 u32 delay = 1000;
643
644 if (delay > us)
645 delay = us;
646 udelay(delay);
647 touch_nmi_watchdog();
648 us -= delay;
649 }
650}
651
652/*
653 * Support ACPI 3.0 AML Timer operand
654 * Returns 64-bit free-running, monotonically increasing timer
655 * with 100ns granularity
656 */
657u64 acpi_os_get_timer(void)
658{
659 static u64 t;
660
661#ifdef CONFIG_HPET
662 /* TBD: use HPET if available */
663#endif
664
665#ifdef CONFIG_X86_PM_TIMER
666 /* TBD: default to PM timer if HPET was not available */
667#endif
668 if (!t)
669 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
670
671 return ++t;
672}
673
674acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
675{
676 u32 dummy;
677
678 if (!value)
679 value = &dummy;
680
681 *value = 0;
682 if (width <= 8) {
683 *(u8 *) value = inb(port);
684 } else if (width <= 16) {
685 *(u16 *) value = inw(port);
686 } else if (width <= 32) {
687 *(u32 *) value = inl(port);
688 } else {
689 BUG();
690 }
691
692 return AE_OK;
693}
694
695EXPORT_SYMBOL(acpi_os_read_port);
696
697acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
698{
699 if (width <= 8) {
700 outb(value, port);
701 } else if (width <= 16) {
702 outw(value, port);
703 } else if (width <= 32) {
704 outl(value, port);
705 } else {
706 BUG();
707 }
708
709 return AE_OK;
710}
711
712EXPORT_SYMBOL(acpi_os_write_port);
713
714#ifdef readq
715static inline u64 read64(const volatile void __iomem *addr)
716{
717 return readq(addr);
718}
719#else
720static inline u64 read64(const volatile void __iomem *addr)
721{
722 u64 l, h;
723 l = readl(addr);
724 h = readl(addr+4);
725 return l | (h << 32);
726}
727#endif
728
729acpi_status
730acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
731{
732 void __iomem *virt_addr;
733 unsigned int size = width / 8;
734 bool unmap = false;
735 u64 dummy;
736
737 rcu_read_lock();
738 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
739 if (!virt_addr) {
740 rcu_read_unlock();
741 virt_addr = acpi_os_ioremap(phys_addr, size);
742 if (!virt_addr)
743 return AE_BAD_ADDRESS;
744 unmap = true;
745 }
746
747 if (!value)
748 value = &dummy;
749
750 switch (width) {
751 case 8:
752 *(u8 *) value = readb(virt_addr);
753 break;
754 case 16:
755 *(u16 *) value = readw(virt_addr);
756 break;
757 case 32:
758 *(u32 *) value = readl(virt_addr);
759 break;
760 case 64:
761 *(u64 *) value = read64(virt_addr);
762 break;
763 default:
764 BUG();
765 }
766
767 if (unmap)
768 iounmap(virt_addr);
769 else
770 rcu_read_unlock();
771
772 return AE_OK;
773}
774
775#ifdef writeq
776static inline void write64(u64 val, volatile void __iomem *addr)
777{
778 writeq(val, addr);
779}
780#else
781static inline void write64(u64 val, volatile void __iomem *addr)
782{
783 writel(val, addr);
784 writel(val>>32, addr+4);
785}
786#endif
787
788acpi_status
789acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
790{
791 void __iomem *virt_addr;
792 unsigned int size = width / 8;
793 bool unmap = false;
794
795 rcu_read_lock();
796 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
797 if (!virt_addr) {
798 rcu_read_unlock();
799 virt_addr = acpi_os_ioremap(phys_addr, size);
800 if (!virt_addr)
801 return AE_BAD_ADDRESS;
802 unmap = true;
803 }
804
805 switch (width) {
806 case 8:
807 writeb(value, virt_addr);
808 break;
809 case 16:
810 writew(value, virt_addr);
811 break;
812 case 32:
813 writel(value, virt_addr);
814 break;
815 case 64:
816 write64(value, virt_addr);
817 break;
818 default:
819 BUG();
820 }
821
822 if (unmap)
823 iounmap(virt_addr);
824 else
825 rcu_read_unlock();
826
827 return AE_OK;
828}
829
830acpi_status
831acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
832 u64 *value, u32 width)
833{
834 int result, size;
835 u32 value32;
836
837 if (!value)
838 return AE_BAD_PARAMETER;
839
840 switch (width) {
841 case 8:
842 size = 1;
843 break;
844 case 16:
845 size = 2;
846 break;
847 case 32:
848 size = 4;
849 break;
850 default:
851 return AE_ERROR;
852 }
853
854 result = raw_pci_read(pci_id->segment, pci_id->bus,
855 PCI_DEVFN(pci_id->device, pci_id->function),
856 reg, size, &value32);
857 *value = value32;
858
859 return (result ? AE_ERROR : AE_OK);
860}
861
862acpi_status
863acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
864 u64 value, u32 width)
865{
866 int result, size;
867
868 switch (width) {
869 case 8:
870 size = 1;
871 break;
872 case 16:
873 size = 2;
874 break;
875 case 32:
876 size = 4;
877 break;
878 default:
879 return AE_ERROR;
880 }
881
882 result = raw_pci_write(pci_id->segment, pci_id->bus,
883 PCI_DEVFN(pci_id->device, pci_id->function),
884 reg, size, value);
885
886 return (result ? AE_ERROR : AE_OK);
887}
888
889static void acpi_os_execute_deferred(struct work_struct *work)
890{
891 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
892
893 if (dpc->wait)
894 acpi_os_wait_events_complete(NULL);
895
896 dpc->function(dpc->context);
897 kfree(dpc);
898}
899
900/*******************************************************************************
901 *
902 * FUNCTION: acpi_os_execute
903 *
904 * PARAMETERS: Type - Type of the callback
905 * Function - Function to be executed
906 * Context - Function parameters
907 *
908 * RETURN: Status
909 *
910 * DESCRIPTION: Depending on type, either queues function for deferred execution or
911 * immediately executes function on a separate thread.
912 *
913 ******************************************************************************/
914
915static acpi_status __acpi_os_execute(acpi_execute_type type,
916 acpi_osd_exec_callback function, void *context, int hp)
917{
918 acpi_status status = AE_OK;
919 struct acpi_os_dpc *dpc;
920 struct workqueue_struct *queue;
921 int ret;
922 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
923 "Scheduling function [%p(%p)] for deferred execution.\n",
924 function, context));
925
926 /*
927 * Allocate/initialize DPC structure. Note that this memory will be
928 * freed by the callee. The kernel handles the work_struct list in a
929 * way that allows us to also free its memory inside the callee.
930 * Because we may want to schedule several tasks with different
931 * parameters we can't use the approach some kernel code uses of
932 * having a static work_struct.
933 */
934
935 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
936 if (!dpc)
937 return AE_NO_MEMORY;
938
939 dpc->function = function;
940 dpc->context = context;
941
942 /*
943 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
944 * because the hotplug code may call driver .remove() functions,
945 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
946 * to flush these workqueues.
947 */
948 queue = hp ? kacpi_hotplug_wq :
949 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
950 dpc->wait = hp ? 1 : 0;
951
952 if (queue == kacpi_hotplug_wq)
953 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
954 else if (queue == kacpi_notify_wq)
955 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
956 else
957 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
958
959 /*
960 * On some machines, a software-initiated SMI causes corruption unless
961 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
962 * typically it's done in GPE-related methods that are run via
963 * workqueues, so we can avoid the known corruption cases by always
964 * queueing on CPU 0.
965 */
966 ret = queue_work_on(0, queue, &dpc->work);
967
968 if (!ret) {
969 printk(KERN_ERR PREFIX
970 "Call to queue_work() failed.\n");
971 status = AE_ERROR;
972 kfree(dpc);
973 }
974 return status;
975}
976
977acpi_status acpi_os_execute(acpi_execute_type type,
978 acpi_osd_exec_callback function, void *context)
979{
980 return __acpi_os_execute(type, function, context, 0);
981}
982EXPORT_SYMBOL(acpi_os_execute);
983
984acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
985 void *context)
986{
987 return __acpi_os_execute(0, function, context, 1);
988}
989
990void acpi_os_wait_events_complete(void *context)
991{
992 flush_workqueue(kacpid_wq);
993 flush_workqueue(kacpi_notify_wq);
994}
995
996EXPORT_SYMBOL(acpi_os_wait_events_complete);
997
998acpi_status
999acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1000{
1001 struct semaphore *sem = NULL;
1002
1003 sem = acpi_os_allocate(sizeof(struct semaphore));
1004 if (!sem)
1005 return AE_NO_MEMORY;
1006 memset(sem, 0, sizeof(struct semaphore));
1007
1008 sema_init(sem, initial_units);
1009
1010 *handle = (acpi_handle *) sem;
1011
1012 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1013 *handle, initial_units));
1014
1015 return AE_OK;
1016}
1017
1018/*
1019 * TODO: A better way to delete semaphores? Linux doesn't have a
1020 * 'delete_semaphore()' function -- may result in an invalid
1021 * pointer dereference for non-synchronized consumers. Should
1022 * we at least check for blocked threads and signal/cancel them?
1023 */
1024
1025acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1026{
1027 struct semaphore *sem = (struct semaphore *)handle;
1028
1029 if (!sem)
1030 return AE_BAD_PARAMETER;
1031
1032 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1033
1034 BUG_ON(!list_empty(&sem->wait_list));
1035 kfree(sem);
1036 sem = NULL;
1037
1038 return AE_OK;
1039}
1040
1041/*
1042 * TODO: Support for units > 1?
1043 */
1044acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1045{
1046 acpi_status status = AE_OK;
1047 struct semaphore *sem = (struct semaphore *)handle;
1048 long jiffies;
1049 int ret = 0;
1050
1051 if (!sem || (units < 1))
1052 return AE_BAD_PARAMETER;
1053
1054 if (units > 1)
1055 return AE_SUPPORT;
1056
1057 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1058 handle, units, timeout));
1059
1060 if (timeout == ACPI_WAIT_FOREVER)
1061 jiffies = MAX_SCHEDULE_TIMEOUT;
1062 else
1063 jiffies = msecs_to_jiffies(timeout);
1064
1065 ret = down_timeout(sem, jiffies);
1066 if (ret)
1067 status = AE_TIME;
1068
1069 if (ACPI_FAILURE(status)) {
1070 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1071 "Failed to acquire semaphore[%p|%d|%d], %s",
1072 handle, units, timeout,
1073 acpi_format_exception(status)));
1074 } else {
1075 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1076 "Acquired semaphore[%p|%d|%d]", handle,
1077 units, timeout));
1078 }
1079
1080 return status;
1081}
1082
1083/*
1084 * TODO: Support for units > 1?
1085 */
1086acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1087{
1088 struct semaphore *sem = (struct semaphore *)handle;
1089
1090 if (!sem || (units < 1))
1091 return AE_BAD_PARAMETER;
1092
1093 if (units > 1)
1094 return AE_SUPPORT;
1095
1096 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1097 units));
1098
1099 up(sem);
1100
1101 return AE_OK;
1102}
1103
1104#ifdef ACPI_FUTURE_USAGE
1105u32 acpi_os_get_line(char *buffer)
1106{
1107
1108#ifdef ENABLE_DEBUGGER
1109 if (acpi_in_debugger) {
1110 u32 chars;
1111
1112 kdb_read(buffer, sizeof(line_buf));
1113
1114 /* remove the CR kdb includes */
1115 chars = strlen(buffer) - 1;
1116 buffer[chars] = '\0';
1117 }
1118#endif
1119
1120 return 0;
1121}
1122#endif /* ACPI_FUTURE_USAGE */
1123
1124acpi_status acpi_os_signal(u32 function, void *info)
1125{
1126 switch (function) {
1127 case ACPI_SIGNAL_FATAL:
1128 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1129 break;
1130 case ACPI_SIGNAL_BREAKPOINT:
1131 /*
1132 * AML Breakpoint
1133 * ACPI spec. says to treat it as a NOP unless
1134 * you are debugging. So if/when we integrate
1135 * AML debugger into the kernel debugger its
1136 * hook will go here. But until then it is
1137 * not useful to print anything on breakpoints.
1138 */
1139 break;
1140 default:
1141 break;
1142 }
1143
1144 return AE_OK;
1145}
1146
1147static int __init acpi_os_name_setup(char *str)
1148{
1149 char *p = acpi_os_name;
1150 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1151
1152 if (!str || !*str)
1153 return 0;
1154
1155 for (; count-- && str && *str; str++) {
1156 if (isalnum(*str) || *str == ' ' || *str == ':')
1157 *p++ = *str;
1158 else if (*str == '\'' || *str == '"')
1159 continue;
1160 else
1161 break;
1162 }
1163 *p = 0;
1164
1165 return 1;
1166
1167}
1168
1169__setup("acpi_os_name=", acpi_os_name_setup);
1170
1171#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1172#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1173
1174struct osi_setup_entry {
1175 char string[OSI_STRING_LENGTH_MAX];
1176 bool enable;
1177};
1178
1179static struct osi_setup_entry __initdata
1180 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1181 {"Module Device", true},
1182 {"Processor Device", true},
1183 {"3.0 _SCP Extensions", true},
1184 {"Processor Aggregator Device", true},
1185};
1186
1187void __init acpi_osi_setup(char *str)
1188{
1189 struct osi_setup_entry *osi;
1190 bool enable = true;
1191 int i;
1192
1193 if (!acpi_gbl_create_osi_method)
1194 return;
1195
1196 if (str == NULL || *str == '\0') {
1197 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1198 acpi_gbl_create_osi_method = FALSE;
1199 return;
1200 }
1201
1202 if (*str == '!') {
1203 str++;
1204 enable = false;
1205 }
1206
1207 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1208 osi = &osi_setup_entries[i];
1209 if (!strcmp(osi->string, str)) {
1210 osi->enable = enable;
1211 break;
1212 } else if (osi->string[0] == '\0') {
1213 osi->enable = enable;
1214 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1215 break;
1216 }
1217 }
1218}
1219
1220static void __init set_osi_linux(unsigned int enable)
1221{
1222 if (osi_linux.enable != enable)
1223 osi_linux.enable = enable;
1224
1225 if (osi_linux.enable)
1226 acpi_osi_setup("Linux");
1227 else
1228 acpi_osi_setup("!Linux");
1229
1230 return;
1231}
1232
1233static void __init acpi_cmdline_osi_linux(unsigned int enable)
1234{
1235 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1236 osi_linux.dmi = 0;
1237 set_osi_linux(enable);
1238
1239 return;
1240}
1241
1242void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1243{
1244 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1245
1246 if (enable == -1)
1247 return;
1248
1249 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1250 set_osi_linux(enable);
1251
1252 return;
1253}
1254
1255/*
1256 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1257 *
1258 * empty string disables _OSI
1259 * string starting with '!' disables that string
1260 * otherwise string is added to list, augmenting built-in strings
1261 */
1262static void __init acpi_osi_setup_late(void)
1263{
1264 struct osi_setup_entry *osi;
1265 char *str;
1266 int i;
1267 acpi_status status;
1268
1269 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1270 osi = &osi_setup_entries[i];
1271 str = osi->string;
1272
1273 if (*str == '\0')
1274 break;
1275 if (osi->enable) {
1276 status = acpi_install_interface(str);
1277
1278 if (ACPI_SUCCESS(status))
1279 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1280 } else {
1281 status = acpi_remove_interface(str);
1282
1283 if (ACPI_SUCCESS(status))
1284 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1285 }
1286 }
1287}
1288
1289static int __init osi_setup(char *str)
1290{
1291 if (str && !strcmp("Linux", str))
1292 acpi_cmdline_osi_linux(1);
1293 else if (str && !strcmp("!Linux", str))
1294 acpi_cmdline_osi_linux(0);
1295 else
1296 acpi_osi_setup(str);
1297
1298 return 1;
1299}
1300
1301__setup("acpi_osi=", osi_setup);
1302
1303/* enable serialization to combat AE_ALREADY_EXISTS errors */
1304static int __init acpi_serialize_setup(char *str)
1305{
1306 printk(KERN_INFO PREFIX "serialize enabled\n");
1307
1308 acpi_gbl_all_methods_serialized = TRUE;
1309
1310 return 1;
1311}
1312
1313__setup("acpi_serialize", acpi_serialize_setup);
1314
1315/* Check of resource interference between native drivers and ACPI
1316 * OperationRegions (SystemIO and System Memory only).
1317 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1318 * in arbitrary AML code and can interfere with legacy drivers.
1319 * acpi_enforce_resources= can be set to:
1320 *
1321 * - strict (default) (2)
1322 * -> further driver trying to access the resources will not load
1323 * - lax (1)
1324 * -> further driver trying to access the resources will load, but you
1325 * get a system message that something might go wrong...
1326 *
1327 * - no (0)
1328 * -> ACPI Operation Region resources will not be registered
1329 *
1330 */
1331#define ENFORCE_RESOURCES_STRICT 2
1332#define ENFORCE_RESOURCES_LAX 1
1333#define ENFORCE_RESOURCES_NO 0
1334
1335static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1336
1337static int __init acpi_enforce_resources_setup(char *str)
1338{
1339 if (str == NULL || *str == '\0')
1340 return 0;
1341
1342 if (!strcmp("strict", str))
1343 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1344 else if (!strcmp("lax", str))
1345 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1346 else if (!strcmp("no", str))
1347 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1348
1349 return 1;
1350}
1351
1352__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1353
1354/* Check for resource conflicts between ACPI OperationRegions and native
1355 * drivers */
1356int acpi_check_resource_conflict(const struct resource *res)
1357{
1358 acpi_adr_space_type space_id;
1359 acpi_size length;
1360 u8 warn = 0;
1361 int clash = 0;
1362
1363 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1364 return 0;
1365 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1366 return 0;
1367
1368 if (res->flags & IORESOURCE_IO)
1369 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1370 else
1371 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1372
1373 length = res->end - res->start + 1;
1374 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1375 warn = 1;
1376 clash = acpi_check_address_range(space_id, res->start, length, warn);
1377
1378 if (clash) {
1379 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1380 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1381 printk(KERN_NOTICE "ACPI: This conflict may"
1382 " cause random problems and system"
1383 " instability\n");
1384 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1385 " for this device, you should use it instead of"
1386 " the native driver\n");
1387 }
1388 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1389 return -EBUSY;
1390 }
1391 return 0;
1392}
1393EXPORT_SYMBOL(acpi_check_resource_conflict);
1394
1395int acpi_check_region(resource_size_t start, resource_size_t n,
1396 const char *name)
1397{
1398 struct resource res = {
1399 .start = start,
1400 .end = start + n - 1,
1401 .name = name,
1402 .flags = IORESOURCE_IO,
1403 };
1404
1405 return acpi_check_resource_conflict(&res);
1406}
1407EXPORT_SYMBOL(acpi_check_region);
1408
1409/*
1410 * Let drivers know whether the resource checks are effective
1411 */
1412int acpi_resources_are_enforced(void)
1413{
1414 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1415}
1416EXPORT_SYMBOL(acpi_resources_are_enforced);
1417
1418/*
1419 * Deallocate the memory for a spinlock.
1420 */
1421void acpi_os_delete_lock(acpi_spinlock handle)
1422{
1423 ACPI_FREE(handle);
1424}
1425
1426/*
1427 * Acquire a spinlock.
1428 *
1429 * handle is a pointer to the spinlock_t.
1430 */
1431
1432acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1433{
1434 acpi_cpu_flags flags;
1435 spin_lock_irqsave(lockp, flags);
1436 return flags;
1437}
1438
1439/*
1440 * Release a spinlock. See above.
1441 */
1442
1443void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1444{
1445 spin_unlock_irqrestore(lockp, flags);
1446}
1447
1448#ifndef ACPI_USE_LOCAL_CACHE
1449
1450/*******************************************************************************
1451 *
1452 * FUNCTION: acpi_os_create_cache
1453 *
1454 * PARAMETERS: name - Ascii name for the cache
1455 * size - Size of each cached object
1456 * depth - Maximum depth of the cache (in objects) <ignored>
1457 * cache - Where the new cache object is returned
1458 *
1459 * RETURN: status
1460 *
1461 * DESCRIPTION: Create a cache object
1462 *
1463 ******************************************************************************/
1464
1465acpi_status
1466acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1467{
1468 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1469 if (*cache == NULL)
1470 return AE_ERROR;
1471 else
1472 return AE_OK;
1473}
1474
1475/*******************************************************************************
1476 *
1477 * FUNCTION: acpi_os_purge_cache
1478 *
1479 * PARAMETERS: Cache - Handle to cache object
1480 *
1481 * RETURN: Status
1482 *
1483 * DESCRIPTION: Free all objects within the requested cache.
1484 *
1485 ******************************************************************************/
1486
1487acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1488{
1489 kmem_cache_shrink(cache);
1490 return (AE_OK);
1491}
1492
1493/*******************************************************************************
1494 *
1495 * FUNCTION: acpi_os_delete_cache
1496 *
1497 * PARAMETERS: Cache - Handle to cache object
1498 *
1499 * RETURN: Status
1500 *
1501 * DESCRIPTION: Free all objects within the requested cache and delete the
1502 * cache object.
1503 *
1504 ******************************************************************************/
1505
1506acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1507{
1508 kmem_cache_destroy(cache);
1509 return (AE_OK);
1510}
1511
1512/*******************************************************************************
1513 *
1514 * FUNCTION: acpi_os_release_object
1515 *
1516 * PARAMETERS: Cache - Handle to cache object
1517 * Object - The object to be released
1518 *
1519 * RETURN: None
1520 *
1521 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1522 * the object is deleted.
1523 *
1524 ******************************************************************************/
1525
1526acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1527{
1528 kmem_cache_free(cache, object);
1529 return (AE_OK);
1530}
1531#endif
1532
1533acpi_status __init acpi_os_initialize(void)
1534{
1535 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1536 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1537 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1538 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1539
1540 return AE_OK;
1541}
1542
1543acpi_status __init acpi_os_initialize1(void)
1544{
1545 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1546 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1547 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1548 BUG_ON(!kacpid_wq);
1549 BUG_ON(!kacpi_notify_wq);
1550 BUG_ON(!kacpi_hotplug_wq);
1551 acpi_install_interface_handler(acpi_osi_handler);
1552 acpi_osi_setup_late();
1553 return AE_OK;
1554}
1555
1556acpi_status acpi_os_terminate(void)
1557{
1558 if (acpi_irq_handler) {
1559 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1560 acpi_irq_handler);
1561 }
1562
1563 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1564 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1565 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1566 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1567
1568 destroy_workqueue(kacpid_wq);
1569 destroy_workqueue(kacpi_notify_wq);
1570 destroy_workqueue(kacpi_hotplug_wq);
1571
1572 return AE_OK;
1573}
1574
1575acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1576 u32 pm1b_control)
1577{
1578 int rc = 0;
1579 if (__acpi_os_prepare_sleep)
1580 rc = __acpi_os_prepare_sleep(sleep_state,
1581 pm1a_control, pm1b_control);
1582 if (rc < 0)
1583 return AE_ERROR;
1584 else if (rc > 0)
1585 return AE_CTRL_SKIP;
1586
1587 return AE_OK;
1588}
1589
1590void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1591 u32 pm1a_ctrl, u32 pm1b_ctrl))
1592{
1593 __acpi_os_prepare_sleep = func;
1594}
1// 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 (!IS_ENABLED(CONFIG_HAS_IOPORT)) {
646 /*
647 * set all-1 result as if reading from non-existing
648 * I/O port
649 */
650 *value = GENMASK(width, 0);
651 return AE_NOT_IMPLEMENTED;
652 }
653
654 if (value)
655 *value = 0;
656 else
657 value = &dummy;
658
659 if (width <= 8) {
660 *value = inb(port);
661 } else if (width <= 16) {
662 *value = inw(port);
663 } else if (width <= 32) {
664 *value = inl(port);
665 } else {
666 pr_debug("%s: Access width %d not supported\n", __func__, width);
667 return AE_BAD_PARAMETER;
668 }
669
670 return AE_OK;
671}
672
673EXPORT_SYMBOL(acpi_os_read_port);
674
675acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
676{
677 if (!IS_ENABLED(CONFIG_HAS_IOPORT))
678 return AE_NOT_IMPLEMENTED;
679
680 if (width <= 8) {
681 outb(value, port);
682 } else if (width <= 16) {
683 outw(value, port);
684 } else if (width <= 32) {
685 outl(value, port);
686 } else {
687 pr_debug("%s: Access width %d not supported\n", __func__, width);
688 return AE_BAD_PARAMETER;
689 }
690
691 return AE_OK;
692}
693
694EXPORT_SYMBOL(acpi_os_write_port);
695
696int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
697{
698
699 switch (width) {
700 case 8:
701 *(u8 *) value = readb(virt_addr);
702 break;
703 case 16:
704 *(u16 *) value = readw(virt_addr);
705 break;
706 case 32:
707 *(u32 *) value = readl(virt_addr);
708 break;
709 case 64:
710 *(u64 *) value = readq(virt_addr);
711 break;
712 default:
713 return -EINVAL;
714 }
715
716 return 0;
717}
718
719acpi_status
720acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
721{
722 void __iomem *virt_addr;
723 unsigned int size = width / 8;
724 bool unmap = false;
725 u64 dummy;
726 int error;
727
728 rcu_read_lock();
729 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
730 if (!virt_addr) {
731 rcu_read_unlock();
732 virt_addr = acpi_os_ioremap(phys_addr, size);
733 if (!virt_addr)
734 return AE_BAD_ADDRESS;
735 unmap = true;
736 }
737
738 if (!value)
739 value = &dummy;
740
741 error = acpi_os_read_iomem(virt_addr, value, width);
742 BUG_ON(error);
743
744 if (unmap)
745 iounmap(virt_addr);
746 else
747 rcu_read_unlock();
748
749 return AE_OK;
750}
751
752acpi_status
753acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
754{
755 void __iomem *virt_addr;
756 unsigned int size = width / 8;
757 bool unmap = false;
758
759 rcu_read_lock();
760 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
761 if (!virt_addr) {
762 rcu_read_unlock();
763 virt_addr = acpi_os_ioremap(phys_addr, size);
764 if (!virt_addr)
765 return AE_BAD_ADDRESS;
766 unmap = true;
767 }
768
769 switch (width) {
770 case 8:
771 writeb(value, virt_addr);
772 break;
773 case 16:
774 writew(value, virt_addr);
775 break;
776 case 32:
777 writel(value, virt_addr);
778 break;
779 case 64:
780 writeq(value, virt_addr);
781 break;
782 default:
783 BUG();
784 }
785
786 if (unmap)
787 iounmap(virt_addr);
788 else
789 rcu_read_unlock();
790
791 return AE_OK;
792}
793
794#ifdef CONFIG_PCI
795acpi_status
796acpi_os_read_pci_configuration(struct acpi_pci_id *pci_id, u32 reg,
797 u64 *value, u32 width)
798{
799 int result, size;
800 u32 value32;
801
802 if (!value)
803 return AE_BAD_PARAMETER;
804
805 switch (width) {
806 case 8:
807 size = 1;
808 break;
809 case 16:
810 size = 2;
811 break;
812 case 32:
813 size = 4;
814 break;
815 default:
816 return AE_ERROR;
817 }
818
819 result = raw_pci_read(pci_id->segment, pci_id->bus,
820 PCI_DEVFN(pci_id->device, pci_id->function),
821 reg, size, &value32);
822 *value = value32;
823
824 return (result ? AE_ERROR : AE_OK);
825}
826
827acpi_status
828acpi_os_write_pci_configuration(struct acpi_pci_id *pci_id, u32 reg,
829 u64 value, u32 width)
830{
831 int result, size;
832
833 switch (width) {
834 case 8:
835 size = 1;
836 break;
837 case 16:
838 size = 2;
839 break;
840 case 32:
841 size = 4;
842 break;
843 default:
844 return AE_ERROR;
845 }
846
847 result = raw_pci_write(pci_id->segment, pci_id->bus,
848 PCI_DEVFN(pci_id->device, pci_id->function),
849 reg, size, value);
850
851 return (result ? AE_ERROR : AE_OK);
852}
853#endif
854
855static void acpi_os_execute_deferred(struct work_struct *work)
856{
857 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
858
859 dpc->function(dpc->context);
860 kfree(dpc);
861}
862
863#ifdef CONFIG_ACPI_DEBUGGER
864static struct acpi_debugger acpi_debugger;
865static bool acpi_debugger_initialized;
866
867int acpi_register_debugger(struct module *owner,
868 const struct acpi_debugger_ops *ops)
869{
870 int ret = 0;
871
872 mutex_lock(&acpi_debugger.lock);
873 if (acpi_debugger.ops) {
874 ret = -EBUSY;
875 goto err_lock;
876 }
877
878 acpi_debugger.owner = owner;
879 acpi_debugger.ops = ops;
880
881err_lock:
882 mutex_unlock(&acpi_debugger.lock);
883 return ret;
884}
885EXPORT_SYMBOL(acpi_register_debugger);
886
887void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
888{
889 mutex_lock(&acpi_debugger.lock);
890 if (ops == acpi_debugger.ops) {
891 acpi_debugger.ops = NULL;
892 acpi_debugger.owner = NULL;
893 }
894 mutex_unlock(&acpi_debugger.lock);
895}
896EXPORT_SYMBOL(acpi_unregister_debugger);
897
898int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
899{
900 int ret;
901 int (*func)(acpi_osd_exec_callback, void *);
902 struct module *owner;
903
904 if (!acpi_debugger_initialized)
905 return -ENODEV;
906 mutex_lock(&acpi_debugger.lock);
907 if (!acpi_debugger.ops) {
908 ret = -ENODEV;
909 goto err_lock;
910 }
911 if (!try_module_get(acpi_debugger.owner)) {
912 ret = -ENODEV;
913 goto err_lock;
914 }
915 func = acpi_debugger.ops->create_thread;
916 owner = acpi_debugger.owner;
917 mutex_unlock(&acpi_debugger.lock);
918
919 ret = func(function, context);
920
921 mutex_lock(&acpi_debugger.lock);
922 module_put(owner);
923err_lock:
924 mutex_unlock(&acpi_debugger.lock);
925 return ret;
926}
927
928ssize_t acpi_debugger_write_log(const char *msg)
929{
930 ssize_t ret;
931 ssize_t (*func)(const char *);
932 struct module *owner;
933
934 if (!acpi_debugger_initialized)
935 return -ENODEV;
936 mutex_lock(&acpi_debugger.lock);
937 if (!acpi_debugger.ops) {
938 ret = -ENODEV;
939 goto err_lock;
940 }
941 if (!try_module_get(acpi_debugger.owner)) {
942 ret = -ENODEV;
943 goto err_lock;
944 }
945 func = acpi_debugger.ops->write_log;
946 owner = acpi_debugger.owner;
947 mutex_unlock(&acpi_debugger.lock);
948
949 ret = func(msg);
950
951 mutex_lock(&acpi_debugger.lock);
952 module_put(owner);
953err_lock:
954 mutex_unlock(&acpi_debugger.lock);
955 return ret;
956}
957
958ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
959{
960 ssize_t ret;
961 ssize_t (*func)(char *, size_t);
962 struct module *owner;
963
964 if (!acpi_debugger_initialized)
965 return -ENODEV;
966 mutex_lock(&acpi_debugger.lock);
967 if (!acpi_debugger.ops) {
968 ret = -ENODEV;
969 goto err_lock;
970 }
971 if (!try_module_get(acpi_debugger.owner)) {
972 ret = -ENODEV;
973 goto err_lock;
974 }
975 func = acpi_debugger.ops->read_cmd;
976 owner = acpi_debugger.owner;
977 mutex_unlock(&acpi_debugger.lock);
978
979 ret = func(buffer, buffer_length);
980
981 mutex_lock(&acpi_debugger.lock);
982 module_put(owner);
983err_lock:
984 mutex_unlock(&acpi_debugger.lock);
985 return ret;
986}
987
988int acpi_debugger_wait_command_ready(void)
989{
990 int ret;
991 int (*func)(bool, char *, size_t);
992 struct module *owner;
993
994 if (!acpi_debugger_initialized)
995 return -ENODEV;
996 mutex_lock(&acpi_debugger.lock);
997 if (!acpi_debugger.ops) {
998 ret = -ENODEV;
999 goto err_lock;
1000 }
1001 if (!try_module_get(acpi_debugger.owner)) {
1002 ret = -ENODEV;
1003 goto err_lock;
1004 }
1005 func = acpi_debugger.ops->wait_command_ready;
1006 owner = acpi_debugger.owner;
1007 mutex_unlock(&acpi_debugger.lock);
1008
1009 ret = func(acpi_gbl_method_executing,
1010 acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
1011
1012 mutex_lock(&acpi_debugger.lock);
1013 module_put(owner);
1014err_lock:
1015 mutex_unlock(&acpi_debugger.lock);
1016 return ret;
1017}
1018
1019int acpi_debugger_notify_command_complete(void)
1020{
1021 int ret;
1022 int (*func)(void);
1023 struct module *owner;
1024
1025 if (!acpi_debugger_initialized)
1026 return -ENODEV;
1027 mutex_lock(&acpi_debugger.lock);
1028 if (!acpi_debugger.ops) {
1029 ret = -ENODEV;
1030 goto err_lock;
1031 }
1032 if (!try_module_get(acpi_debugger.owner)) {
1033 ret = -ENODEV;
1034 goto err_lock;
1035 }
1036 func = acpi_debugger.ops->notify_command_complete;
1037 owner = acpi_debugger.owner;
1038 mutex_unlock(&acpi_debugger.lock);
1039
1040 ret = func();
1041
1042 mutex_lock(&acpi_debugger.lock);
1043 module_put(owner);
1044err_lock:
1045 mutex_unlock(&acpi_debugger.lock);
1046 return ret;
1047}
1048
1049int __init acpi_debugger_init(void)
1050{
1051 mutex_init(&acpi_debugger.lock);
1052 acpi_debugger_initialized = true;
1053 return 0;
1054}
1055#endif
1056
1057/*******************************************************************************
1058 *
1059 * FUNCTION: acpi_os_execute
1060 *
1061 * PARAMETERS: Type - Type of the callback
1062 * Function - Function to be executed
1063 * Context - Function parameters
1064 *
1065 * RETURN: Status
1066 *
1067 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1068 * immediately executes function on a separate thread.
1069 *
1070 ******************************************************************************/
1071
1072acpi_status acpi_os_execute(acpi_execute_type type,
1073 acpi_osd_exec_callback function, void *context)
1074{
1075 struct acpi_os_dpc *dpc;
1076 int ret;
1077
1078 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1079 "Scheduling function [%p(%p)] for deferred execution.\n",
1080 function, context));
1081
1082 if (type == OSL_DEBUGGER_MAIN_THREAD) {
1083 ret = acpi_debugger_create_thread(function, context);
1084 if (ret) {
1085 pr_err("Kernel thread creation failed\n");
1086 return AE_ERROR;
1087 }
1088 return AE_OK;
1089 }
1090
1091 /*
1092 * Allocate/initialize DPC structure. Note that this memory will be
1093 * freed by the callee. The kernel handles the work_struct list in a
1094 * way that allows us to also free its memory inside the callee.
1095 * Because we may want to schedule several tasks with different
1096 * parameters we can't use the approach some kernel code uses of
1097 * having a static work_struct.
1098 */
1099
1100 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1101 if (!dpc)
1102 return AE_NO_MEMORY;
1103
1104 dpc->function = function;
1105 dpc->context = context;
1106 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1107
1108 /*
1109 * To prevent lockdep from complaining unnecessarily, make sure that
1110 * there is a different static lockdep key for each workqueue by using
1111 * INIT_WORK() for each of them separately.
1112 */
1113 switch (type) {
1114 case OSL_NOTIFY_HANDLER:
1115 ret = queue_work(kacpi_notify_wq, &dpc->work);
1116 break;
1117 case OSL_GPE_HANDLER:
1118 /*
1119 * On some machines, a software-initiated SMI causes corruption
1120 * unless the SMI runs on CPU 0. An SMI can be initiated by
1121 * any AML, but typically it's done in GPE-related methods that
1122 * are run via workqueues, so we can avoid the known corruption
1123 * cases by always queueing on CPU 0.
1124 */
1125 ret = queue_work_on(0, kacpid_wq, &dpc->work);
1126 break;
1127 default:
1128 pr_err("Unsupported os_execute type %d.\n", type);
1129 goto err;
1130 }
1131 if (!ret) {
1132 pr_err("Unable to queue work\n");
1133 goto err;
1134 }
1135
1136 return AE_OK;
1137
1138err:
1139 kfree(dpc);
1140 return AE_ERROR;
1141}
1142EXPORT_SYMBOL(acpi_os_execute);
1143
1144void acpi_os_wait_events_complete(void)
1145{
1146 /*
1147 * Make sure the GPE handler or the fixed event handler is not used
1148 * on another CPU after removal.
1149 */
1150 if (acpi_sci_irq_valid())
1151 synchronize_hardirq(acpi_sci_irq);
1152 flush_workqueue(kacpid_wq);
1153 flush_workqueue(kacpi_notify_wq);
1154}
1155EXPORT_SYMBOL(acpi_os_wait_events_complete);
1156
1157struct acpi_hp_work {
1158 struct work_struct work;
1159 struct acpi_device *adev;
1160 u32 src;
1161};
1162
1163static void acpi_hotplug_work_fn(struct work_struct *work)
1164{
1165 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1166
1167 acpi_os_wait_events_complete();
1168 acpi_device_hotplug(hpw->adev, hpw->src);
1169 kfree(hpw);
1170}
1171
1172acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1173{
1174 struct acpi_hp_work *hpw;
1175
1176 acpi_handle_debug(adev->handle,
1177 "Scheduling hotplug event %u for deferred handling\n",
1178 src);
1179
1180 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1181 if (!hpw)
1182 return AE_NO_MEMORY;
1183
1184 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1185 hpw->adev = adev;
1186 hpw->src = src;
1187 /*
1188 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1189 * the hotplug code may call driver .remove() functions, which may
1190 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1191 * these workqueues.
1192 */
1193 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1194 kfree(hpw);
1195 return AE_ERROR;
1196 }
1197 return AE_OK;
1198}
1199
1200bool acpi_queue_hotplug_work(struct work_struct *work)
1201{
1202 return queue_work(kacpi_hotplug_wq, work);
1203}
1204
1205acpi_status
1206acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle *handle)
1207{
1208 struct semaphore *sem = NULL;
1209
1210 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1211 if (!sem)
1212 return AE_NO_MEMORY;
1213
1214 sema_init(sem, initial_units);
1215
1216 *handle = (acpi_handle *) sem;
1217
1218 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1219 *handle, initial_units));
1220
1221 return AE_OK;
1222}
1223
1224/*
1225 * TODO: A better way to delete semaphores? Linux doesn't have a
1226 * 'delete_semaphore()' function -- may result in an invalid
1227 * pointer dereference for non-synchronized consumers. Should
1228 * we at least check for blocked threads and signal/cancel them?
1229 */
1230
1231acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1232{
1233 struct semaphore *sem = (struct semaphore *)handle;
1234
1235 if (!sem)
1236 return AE_BAD_PARAMETER;
1237
1238 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1239
1240 BUG_ON(!list_empty(&sem->wait_list));
1241 kfree(sem);
1242 sem = NULL;
1243
1244 return AE_OK;
1245}
1246
1247/*
1248 * TODO: Support for units > 1?
1249 */
1250acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1251{
1252 acpi_status status = AE_OK;
1253 struct semaphore *sem = (struct semaphore *)handle;
1254 long jiffies;
1255 int ret = 0;
1256
1257 if (!acpi_os_initialized)
1258 return AE_OK;
1259
1260 if (!sem || (units < 1))
1261 return AE_BAD_PARAMETER;
1262
1263 if (units > 1)
1264 return AE_SUPPORT;
1265
1266 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1267 handle, units, timeout));
1268
1269 if (timeout == ACPI_WAIT_FOREVER)
1270 jiffies = MAX_SCHEDULE_TIMEOUT;
1271 else
1272 jiffies = msecs_to_jiffies(timeout);
1273
1274 ret = down_timeout(sem, jiffies);
1275 if (ret)
1276 status = AE_TIME;
1277
1278 if (ACPI_FAILURE(status)) {
1279 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1280 "Failed to acquire semaphore[%p|%d|%d], %s",
1281 handle, units, timeout,
1282 acpi_format_exception(status)));
1283 } else {
1284 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1285 "Acquired semaphore[%p|%d|%d]", handle,
1286 units, timeout));
1287 }
1288
1289 return status;
1290}
1291
1292/*
1293 * TODO: Support for units > 1?
1294 */
1295acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1296{
1297 struct semaphore *sem = (struct semaphore *)handle;
1298
1299 if (!acpi_os_initialized)
1300 return AE_OK;
1301
1302 if (!sem || (units < 1))
1303 return AE_BAD_PARAMETER;
1304
1305 if (units > 1)
1306 return AE_SUPPORT;
1307
1308 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1309 units));
1310
1311 up(sem);
1312
1313 return AE_OK;
1314}
1315
1316acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1317{
1318#ifdef ENABLE_DEBUGGER
1319 if (acpi_in_debugger) {
1320 u32 chars;
1321
1322 kdb_read(buffer, buffer_length);
1323
1324 /* remove the CR kdb includes */
1325 chars = strlen(buffer) - 1;
1326 buffer[chars] = '\0';
1327 }
1328#else
1329 int ret;
1330
1331 ret = acpi_debugger_read_cmd(buffer, buffer_length);
1332 if (ret < 0)
1333 return AE_ERROR;
1334 if (bytes_read)
1335 *bytes_read = ret;
1336#endif
1337
1338 return AE_OK;
1339}
1340EXPORT_SYMBOL(acpi_os_get_line);
1341
1342acpi_status acpi_os_wait_command_ready(void)
1343{
1344 int ret;
1345
1346 ret = acpi_debugger_wait_command_ready();
1347 if (ret < 0)
1348 return AE_ERROR;
1349 return AE_OK;
1350}
1351
1352acpi_status acpi_os_notify_command_complete(void)
1353{
1354 int ret;
1355
1356 ret = acpi_debugger_notify_command_complete();
1357 if (ret < 0)
1358 return AE_ERROR;
1359 return AE_OK;
1360}
1361
1362acpi_status acpi_os_signal(u32 function, void *info)
1363{
1364 switch (function) {
1365 case ACPI_SIGNAL_FATAL:
1366 pr_err("Fatal opcode executed\n");
1367 break;
1368 case ACPI_SIGNAL_BREAKPOINT:
1369 /*
1370 * AML Breakpoint
1371 * ACPI spec. says to treat it as a NOP unless
1372 * you are debugging. So if/when we integrate
1373 * AML debugger into the kernel debugger its
1374 * hook will go here. But until then it is
1375 * not useful to print anything on breakpoints.
1376 */
1377 break;
1378 default:
1379 break;
1380 }
1381
1382 return AE_OK;
1383}
1384
1385static int __init acpi_os_name_setup(char *str)
1386{
1387 char *p = acpi_os_name;
1388 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1389
1390 if (!str || !*str)
1391 return 0;
1392
1393 for (; count-- && *str; str++) {
1394 if (isalnum(*str) || *str == ' ' || *str == ':')
1395 *p++ = *str;
1396 else if (*str == '\'' || *str == '"')
1397 continue;
1398 else
1399 break;
1400 }
1401 *p = 0;
1402
1403 return 1;
1404
1405}
1406
1407__setup("acpi_os_name=", acpi_os_name_setup);
1408
1409/*
1410 * Disable the auto-serialization of named objects creation methods.
1411 *
1412 * This feature is enabled by default. It marks the AML control methods
1413 * that contain the opcodes to create named objects as "Serialized".
1414 */
1415static int __init acpi_no_auto_serialize_setup(char *str)
1416{
1417 acpi_gbl_auto_serialize_methods = FALSE;
1418 pr_info("Auto-serialization disabled\n");
1419
1420 return 1;
1421}
1422
1423__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1424
1425/* Check of resource interference between native drivers and ACPI
1426 * OperationRegions (SystemIO and System Memory only).
1427 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1428 * in arbitrary AML code and can interfere with legacy drivers.
1429 * acpi_enforce_resources= can be set to:
1430 *
1431 * - strict (default) (2)
1432 * -> further driver trying to access the resources will not load
1433 * - lax (1)
1434 * -> further driver trying to access the resources will load, but you
1435 * get a system message that something might go wrong...
1436 *
1437 * - no (0)
1438 * -> ACPI Operation Region resources will not be registered
1439 *
1440 */
1441#define ENFORCE_RESOURCES_STRICT 2
1442#define ENFORCE_RESOURCES_LAX 1
1443#define ENFORCE_RESOURCES_NO 0
1444
1445static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1446
1447static int __init acpi_enforce_resources_setup(char *str)
1448{
1449 if (str == NULL || *str == '\0')
1450 return 0;
1451
1452 if (!strcmp("strict", str))
1453 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1454 else if (!strcmp("lax", str))
1455 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1456 else if (!strcmp("no", str))
1457 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1458
1459 return 1;
1460}
1461
1462__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1463
1464/* Check for resource conflicts between ACPI OperationRegions and native
1465 * drivers */
1466int acpi_check_resource_conflict(const struct resource *res)
1467{
1468 acpi_adr_space_type space_id;
1469
1470 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1471 return 0;
1472
1473 if (res->flags & IORESOURCE_IO)
1474 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1475 else if (res->flags & IORESOURCE_MEM)
1476 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1477 else
1478 return 0;
1479
1480 if (!acpi_check_address_range(space_id, res->start, resource_size(res), 1))
1481 return 0;
1482
1483 pr_info("Resource conflict; ACPI support missing from driver?\n");
1484
1485 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1486 return -EBUSY;
1487
1488 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1489 pr_notice("Resource conflict: System may be unstable or behave erratically\n");
1490
1491 return 0;
1492}
1493EXPORT_SYMBOL(acpi_check_resource_conflict);
1494
1495int acpi_check_region(resource_size_t start, resource_size_t n,
1496 const char *name)
1497{
1498 struct resource res = DEFINE_RES_IO_NAMED(start, n, name);
1499
1500 return acpi_check_resource_conflict(&res);
1501}
1502EXPORT_SYMBOL(acpi_check_region);
1503
1504/*
1505 * Let drivers know whether the resource checks are effective
1506 */
1507int acpi_resources_are_enforced(void)
1508{
1509 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1510}
1511EXPORT_SYMBOL(acpi_resources_are_enforced);
1512
1513/*
1514 * Deallocate the memory for a spinlock.
1515 */
1516void acpi_os_delete_lock(acpi_spinlock handle)
1517{
1518 ACPI_FREE(handle);
1519}
1520
1521/*
1522 * Acquire a spinlock.
1523 *
1524 * handle is a pointer to the spinlock_t.
1525 */
1526
1527acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1528 __acquires(lockp)
1529{
1530 spin_lock(lockp);
1531 return 0;
1532}
1533
1534/*
1535 * Release a spinlock. See above.
1536 */
1537
1538void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags not_used)
1539 __releases(lockp)
1540{
1541 spin_unlock(lockp);
1542}
1543
1544#ifndef ACPI_USE_LOCAL_CACHE
1545
1546/*******************************************************************************
1547 *
1548 * FUNCTION: acpi_os_create_cache
1549 *
1550 * PARAMETERS: name - Ascii name for the cache
1551 * size - Size of each cached object
1552 * depth - Maximum depth of the cache (in objects) <ignored>
1553 * cache - Where the new cache object is returned
1554 *
1555 * RETURN: status
1556 *
1557 * DESCRIPTION: Create a cache object
1558 *
1559 ******************************************************************************/
1560
1561acpi_status
1562acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t **cache)
1563{
1564 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1565 if (*cache == NULL)
1566 return AE_ERROR;
1567 else
1568 return AE_OK;
1569}
1570
1571/*******************************************************************************
1572 *
1573 * FUNCTION: acpi_os_purge_cache
1574 *
1575 * PARAMETERS: Cache - Handle to cache object
1576 *
1577 * RETURN: Status
1578 *
1579 * DESCRIPTION: Free all objects within the requested cache.
1580 *
1581 ******************************************************************************/
1582
1583acpi_status acpi_os_purge_cache(acpi_cache_t *cache)
1584{
1585 kmem_cache_shrink(cache);
1586 return AE_OK;
1587}
1588
1589/*******************************************************************************
1590 *
1591 * FUNCTION: acpi_os_delete_cache
1592 *
1593 * PARAMETERS: Cache - Handle to cache object
1594 *
1595 * RETURN: Status
1596 *
1597 * DESCRIPTION: Free all objects within the requested cache and delete the
1598 * cache object.
1599 *
1600 ******************************************************************************/
1601
1602acpi_status acpi_os_delete_cache(acpi_cache_t *cache)
1603{
1604 kmem_cache_destroy(cache);
1605 return AE_OK;
1606}
1607
1608/*******************************************************************************
1609 *
1610 * FUNCTION: acpi_os_release_object
1611 *
1612 * PARAMETERS: Cache - Handle to cache object
1613 * Object - The object to be released
1614 *
1615 * RETURN: None
1616 *
1617 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1618 * the object is deleted.
1619 *
1620 ******************************************************************************/
1621
1622acpi_status acpi_os_release_object(acpi_cache_t *cache, void *object)
1623{
1624 kmem_cache_free(cache, object);
1625 return AE_OK;
1626}
1627#endif
1628
1629static int __init acpi_no_static_ssdt_setup(char *s)
1630{
1631 acpi_gbl_disable_ssdt_table_install = TRUE;
1632 pr_info("Static SSDT installation disabled\n");
1633
1634 return 0;
1635}
1636
1637early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1638
1639static int __init acpi_disable_return_repair(char *s)
1640{
1641 pr_notice("Predefined validation mechanism disabled\n");
1642 acpi_gbl_disable_auto_repair = TRUE;
1643
1644 return 1;
1645}
1646
1647__setup("acpica_no_return_repair", acpi_disable_return_repair);
1648
1649acpi_status __init acpi_os_initialize(void)
1650{
1651 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1652 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1653
1654 acpi_gbl_xgpe0_block_logical_address =
1655 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1656 acpi_gbl_xgpe1_block_logical_address =
1657 (unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1658
1659 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1660 /*
1661 * Use acpi_os_map_generic_address to pre-map the reset
1662 * register if it's in system memory.
1663 */
1664 void *rv;
1665
1666 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1667 pr_debug("%s: Reset register mapping %s\n", __func__,
1668 rv ? "successful" : "failed");
1669 }
1670 acpi_os_initialized = true;
1671
1672 return AE_OK;
1673}
1674
1675acpi_status __init acpi_os_initialize1(void)
1676{
1677 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1678 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 0);
1679 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1680 BUG_ON(!kacpid_wq);
1681 BUG_ON(!kacpi_notify_wq);
1682 BUG_ON(!kacpi_hotplug_wq);
1683 acpi_osi_init();
1684 return AE_OK;
1685}
1686
1687acpi_status acpi_os_terminate(void)
1688{
1689 if (acpi_irq_handler) {
1690 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1691 acpi_irq_handler);
1692 }
1693
1694 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1695 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1696 acpi_gbl_xgpe0_block_logical_address = 0UL;
1697 acpi_gbl_xgpe1_block_logical_address = 0UL;
1698
1699 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1700 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1701
1702 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1703 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1704
1705 destroy_workqueue(kacpid_wq);
1706 destroy_workqueue(kacpi_notify_wq);
1707 destroy_workqueue(kacpi_hotplug_wq);
1708
1709 return AE_OK;
1710}
1711
1712acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1713 u32 pm1b_control)
1714{
1715 int rc = 0;
1716
1717 if (__acpi_os_prepare_sleep)
1718 rc = __acpi_os_prepare_sleep(sleep_state,
1719 pm1a_control, pm1b_control);
1720 if (rc < 0)
1721 return AE_ERROR;
1722 else if (rc > 0)
1723 return AE_CTRL_TERMINATE;
1724
1725 return AE_OK;
1726}
1727
1728void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1729 u32 pm1a_ctrl, u32 pm1b_ctrl))
1730{
1731 __acpi_os_prepare_sleep = func;
1732}
1733
1734#if (ACPI_REDUCED_HARDWARE)
1735acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1736 u32 val_b)
1737{
1738 int rc = 0;
1739
1740 if (__acpi_os_prepare_extended_sleep)
1741 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1742 val_a, val_b);
1743 if (rc < 0)
1744 return AE_ERROR;
1745 else if (rc > 0)
1746 return AE_CTRL_TERMINATE;
1747
1748 return AE_OK;
1749}
1750#else
1751acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1752 u32 val_b)
1753{
1754 return AE_OK;
1755}
1756#endif
1757
1758void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1759 u32 val_a, u32 val_b))
1760{
1761 __acpi_os_prepare_extended_sleep = func;
1762}
1763
1764acpi_status acpi_os_enter_sleep(u8 sleep_state,
1765 u32 reg_a_value, u32 reg_b_value)
1766{
1767 acpi_status status;
1768
1769 if (acpi_gbl_reduced_hardware)
1770 status = acpi_os_prepare_extended_sleep(sleep_state,
1771 reg_a_value,
1772 reg_b_value);
1773 else
1774 status = acpi_os_prepare_sleep(sleep_state,
1775 reg_a_value, reg_b_value);
1776 return status;
1777}