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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/pci.h>
35#include <linux/interrupt.h>
36#include <linux/kmod.h>
37#include <linux/delay.h>
38#include <linux/workqueue.h>
39#include <linux/nmi.h>
40#include <linux/acpi.h>
41#include <linux/acpi_io.h>
42#include <linux/efi.h>
43#include <linux/ioport.h>
44#include <linux/list.h>
45#include <linux/jiffies.h>
46#include <linux/semaphore.h>
47
48#include <asm/io.h>
49#include <asm/uaccess.h>
50
51#include <acpi/acpi.h>
52#include <acpi/acpi_bus.h>
53#include <acpi/processor.h>
54
55#define _COMPONENT ACPI_OS_SERVICES
56ACPI_MODULE_NAME("osl");
57#define PREFIX "ACPI: "
58struct acpi_os_dpc {
59 acpi_osd_exec_callback function;
60 void *context;
61 struct work_struct work;
62 int wait;
63};
64
65#ifdef CONFIG_ACPI_CUSTOM_DSDT
66#include CONFIG_ACPI_CUSTOM_DSDT_FILE
67#endif
68
69#ifdef ENABLE_DEBUGGER
70#include <linux/kdb.h>
71
72/* stuff for debugger support */
73int acpi_in_debugger;
74EXPORT_SYMBOL(acpi_in_debugger);
75
76extern char line_buf[80];
77#endif /*ENABLE_DEBUGGER */
78
79static acpi_osd_handler acpi_irq_handler;
80static void *acpi_irq_context;
81static struct workqueue_struct *kacpid_wq;
82static struct workqueue_struct *kacpi_notify_wq;
83static struct workqueue_struct *kacpi_hotplug_wq;
84
85struct acpi_res_list {
86 resource_size_t start;
87 resource_size_t end;
88 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
89 char name[5]; /* only can have a length of 4 chars, make use of this
90 one instead of res->name, no need to kalloc then */
91 struct list_head resource_list;
92 int count;
93};
94
95static LIST_HEAD(resource_list_head);
96static DEFINE_SPINLOCK(acpi_res_lock);
97
98/*
99 * This list of permanent mappings is for memory that may be accessed from
100 * interrupt context, where we can't do the ioremap().
101 */
102struct acpi_ioremap {
103 struct list_head list;
104 void __iomem *virt;
105 acpi_physical_address phys;
106 acpi_size size;
107 unsigned long refcount;
108};
109
110static LIST_HEAD(acpi_ioremaps);
111static DEFINE_MUTEX(acpi_ioremap_lock);
112
113static void __init acpi_osi_setup_late(void);
114
115/*
116 * The story of _OSI(Linux)
117 *
118 * From pre-history through Linux-2.6.22,
119 * Linux responded TRUE upon a BIOS OSI(Linux) query.
120 *
121 * Unfortunately, reference BIOS writers got wind of this
122 * and put OSI(Linux) in their example code, quickly exposing
123 * this string as ill-conceived and opening the door to
124 * an un-bounded number of BIOS incompatibilities.
125 *
126 * For example, OSI(Linux) was used on resume to re-POST a
127 * video card on one system, because Linux at that time
128 * could not do a speedy restore in its native driver.
129 * But then upon gaining quick native restore capability,
130 * Linux has no way to tell the BIOS to skip the time-consuming
131 * POST -- putting Linux at a permanent performance disadvantage.
132 * On another system, the BIOS writer used OSI(Linux)
133 * to infer native OS support for IPMI! On other systems,
134 * OSI(Linux) simply got in the way of Linux claiming to
135 * be compatible with other operating systems, exposing
136 * BIOS issues such as skipped device initialization.
137 *
138 * So "Linux" turned out to be a really poor chose of
139 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
140 *
141 * BIOS writers should NOT query _OSI(Linux) on future systems.
142 * Linux will complain on the console when it sees it, and return FALSE.
143 * To get Linux to return TRUE for your system will require
144 * a kernel source update to add a DMI entry,
145 * or boot with "acpi_osi=Linux"
146 */
147
148static struct osi_linux {
149 unsigned int enable:1;
150 unsigned int dmi:1;
151 unsigned int cmdline:1;
152} osi_linux = {0, 0, 0};
153
154static u32 acpi_osi_handler(acpi_string interface, u32 supported)
155{
156 if (!strcmp("Linux", interface)) {
157
158 printk_once(KERN_NOTICE FW_BUG PREFIX
159 "BIOS _OSI(Linux) query %s%s\n",
160 osi_linux.enable ? "honored" : "ignored",
161 osi_linux.cmdline ? " via cmdline" :
162 osi_linux.dmi ? " via DMI" : "");
163 }
164
165 return supported;
166}
167
168static void __init acpi_request_region (struct acpi_generic_address *addr,
169 unsigned int length, char *desc)
170{
171 if (!addr->address || !length)
172 return;
173
174 /* Resources are never freed */
175 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
176 request_region(addr->address, length, desc);
177 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
178 request_mem_region(addr->address, length, desc);
179}
180
181static int __init acpi_reserve_resources(void)
182{
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
184 "ACPI PM1a_EVT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
187 "ACPI PM1b_EVT_BLK");
188
189 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
190 "ACPI PM1a_CNT_BLK");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
193 "ACPI PM1b_CNT_BLK");
194
195 if (acpi_gbl_FADT.pm_timer_length == 4)
196 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
197
198 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
199 "ACPI PM2_CNT_BLK");
200
201 /* Length of GPE blocks must be a non-negative multiple of 2 */
202
203 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
204 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
205 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
206
207 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
208 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
209 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
210
211 return 0;
212}
213device_initcall(acpi_reserve_resources);
214
215void acpi_os_printf(const char *fmt, ...)
216{
217 va_list args;
218 va_start(args, fmt);
219 acpi_os_vprintf(fmt, args);
220 va_end(args);
221}
222
223void acpi_os_vprintf(const char *fmt, va_list args)
224{
225 static char buffer[512];
226
227 vsprintf(buffer, fmt, args);
228
229#ifdef ENABLE_DEBUGGER
230 if (acpi_in_debugger) {
231 kdb_printf("%s", buffer);
232 } else {
233 printk(KERN_CONT "%s", buffer);
234 }
235#else
236 printk(KERN_CONT "%s", buffer);
237#endif
238}
239
240#ifdef CONFIG_KEXEC
241static unsigned long acpi_rsdp;
242static int __init setup_acpi_rsdp(char *arg)
243{
244 acpi_rsdp = simple_strtoul(arg, NULL, 16);
245 return 0;
246}
247early_param("acpi_rsdp", setup_acpi_rsdp);
248#endif
249
250acpi_physical_address __init acpi_os_get_root_pointer(void)
251{
252#ifdef CONFIG_KEXEC
253 if (acpi_rsdp)
254 return acpi_rsdp;
255#endif
256
257 if (efi_enabled) {
258 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
259 return efi.acpi20;
260 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
261 return efi.acpi;
262 else {
263 printk(KERN_ERR PREFIX
264 "System description tables not found\n");
265 return 0;
266 }
267 } else {
268 acpi_physical_address pa = 0;
269
270 acpi_find_root_pointer(&pa);
271 return pa;
272 }
273}
274
275/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
276static struct acpi_ioremap *
277acpi_map_lookup(acpi_physical_address phys, acpi_size size)
278{
279 struct acpi_ioremap *map;
280
281 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
282 if (map->phys <= phys &&
283 phys + size <= map->phys + map->size)
284 return map;
285
286 return NULL;
287}
288
289/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
290static void __iomem *
291acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
292{
293 struct acpi_ioremap *map;
294
295 map = acpi_map_lookup(phys, size);
296 if (map)
297 return map->virt + (phys - map->phys);
298
299 return NULL;
300}
301
302void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
303{
304 struct acpi_ioremap *map;
305 void __iomem *virt = NULL;
306
307 mutex_lock(&acpi_ioremap_lock);
308 map = acpi_map_lookup(phys, size);
309 if (map) {
310 virt = map->virt + (phys - map->phys);
311 map->refcount++;
312 }
313 mutex_unlock(&acpi_ioremap_lock);
314 return virt;
315}
316EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
317
318/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
319static struct acpi_ioremap *
320acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
321{
322 struct acpi_ioremap *map;
323
324 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
325 if (map->virt <= virt &&
326 virt + size <= map->virt + map->size)
327 return map;
328
329 return NULL;
330}
331
332void __iomem *__init_refok
333acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
334{
335 struct acpi_ioremap *map;
336 void __iomem *virt;
337 acpi_physical_address pg_off;
338 acpi_size pg_sz;
339
340 if (phys > ULONG_MAX) {
341 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
342 return NULL;
343 }
344
345 if (!acpi_gbl_permanent_mmap)
346 return __acpi_map_table((unsigned long)phys, size);
347
348 mutex_lock(&acpi_ioremap_lock);
349 /* Check if there's a suitable mapping already. */
350 map = acpi_map_lookup(phys, size);
351 if (map) {
352 map->refcount++;
353 goto out;
354 }
355
356 map = kzalloc(sizeof(*map), GFP_KERNEL);
357 if (!map) {
358 mutex_unlock(&acpi_ioremap_lock);
359 return NULL;
360 }
361
362 pg_off = round_down(phys, PAGE_SIZE);
363 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
364 virt = acpi_os_ioremap(pg_off, pg_sz);
365 if (!virt) {
366 mutex_unlock(&acpi_ioremap_lock);
367 kfree(map);
368 return NULL;
369 }
370
371 INIT_LIST_HEAD(&map->list);
372 map->virt = virt;
373 map->phys = pg_off;
374 map->size = pg_sz;
375 map->refcount = 1;
376
377 list_add_tail_rcu(&map->list, &acpi_ioremaps);
378
379 out:
380 mutex_unlock(&acpi_ioremap_lock);
381 return map->virt + (phys - map->phys);
382}
383EXPORT_SYMBOL_GPL(acpi_os_map_memory);
384
385static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
386{
387 if (!--map->refcount)
388 list_del_rcu(&map->list);
389}
390
391static void acpi_os_map_cleanup(struct acpi_ioremap *map)
392{
393 if (!map->refcount) {
394 synchronize_rcu();
395 iounmap(map->virt);
396 kfree(map);
397 }
398}
399
400void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
401{
402 struct acpi_ioremap *map;
403
404 if (!acpi_gbl_permanent_mmap) {
405 __acpi_unmap_table(virt, size);
406 return;
407 }
408
409 mutex_lock(&acpi_ioremap_lock);
410 map = acpi_map_lookup_virt(virt, size);
411 if (!map) {
412 mutex_unlock(&acpi_ioremap_lock);
413 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
414 return;
415 }
416 acpi_os_drop_map_ref(map);
417 mutex_unlock(&acpi_ioremap_lock);
418
419 acpi_os_map_cleanup(map);
420}
421EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
422
423void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
424{
425 if (!acpi_gbl_permanent_mmap)
426 __acpi_unmap_table(virt, size);
427}
428
429static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
430{
431 void __iomem *virt;
432
433 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
434 return 0;
435
436 if (!addr->address || !addr->bit_width)
437 return -EINVAL;
438
439 virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
440 if (!virt)
441 return -EIO;
442
443 return 0;
444}
445
446static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
447{
448 struct acpi_ioremap *map;
449
450 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
451 return;
452
453 if (!addr->address || !addr->bit_width)
454 return;
455
456 mutex_lock(&acpi_ioremap_lock);
457 map = acpi_map_lookup(addr->address, addr->bit_width / 8);
458 if (!map) {
459 mutex_unlock(&acpi_ioremap_lock);
460 return;
461 }
462 acpi_os_drop_map_ref(map);
463 mutex_unlock(&acpi_ioremap_lock);
464
465 acpi_os_map_cleanup(map);
466}
467
468#ifdef ACPI_FUTURE_USAGE
469acpi_status
470acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
471{
472 if (!phys || !virt)
473 return AE_BAD_PARAMETER;
474
475 *phys = virt_to_phys(virt);
476
477 return AE_OK;
478}
479#endif
480
481#define ACPI_MAX_OVERRIDE_LEN 100
482
483static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
484
485acpi_status
486acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
487 acpi_string * new_val)
488{
489 if (!init_val || !new_val)
490 return AE_BAD_PARAMETER;
491
492 *new_val = NULL;
493 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
494 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
495 acpi_os_name);
496 *new_val = acpi_os_name;
497 }
498
499 return AE_OK;
500}
501
502acpi_status
503acpi_os_table_override(struct acpi_table_header * existing_table,
504 struct acpi_table_header ** new_table)
505{
506 if (!existing_table || !new_table)
507 return AE_BAD_PARAMETER;
508
509 *new_table = NULL;
510
511#ifdef CONFIG_ACPI_CUSTOM_DSDT
512 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
513 *new_table = (struct acpi_table_header *)AmlCode;
514#endif
515 if (*new_table != NULL) {
516 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
517 "this is unsafe: tainting kernel\n",
518 existing_table->signature,
519 existing_table->oem_table_id);
520 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
521 }
522 return AE_OK;
523}
524
525static irqreturn_t acpi_irq(int irq, void *dev_id)
526{
527 u32 handled;
528
529 handled = (*acpi_irq_handler) (acpi_irq_context);
530
531 if (handled) {
532 acpi_irq_handled++;
533 return IRQ_HANDLED;
534 } else {
535 acpi_irq_not_handled++;
536 return IRQ_NONE;
537 }
538}
539
540acpi_status
541acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
542 void *context)
543{
544 unsigned int irq;
545
546 acpi_irq_stats_init();
547
548 /*
549 * ACPI interrupts different from the SCI in our copy of the FADT are
550 * not supported.
551 */
552 if (gsi != acpi_gbl_FADT.sci_interrupt)
553 return AE_BAD_PARAMETER;
554
555 if (acpi_irq_handler)
556 return AE_ALREADY_ACQUIRED;
557
558 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
559 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
560 gsi);
561 return AE_OK;
562 }
563
564 acpi_irq_handler = handler;
565 acpi_irq_context = context;
566 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
567 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
568 acpi_irq_handler = NULL;
569 return AE_NOT_ACQUIRED;
570 }
571
572 return AE_OK;
573}
574
575acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
576{
577 if (irq != acpi_gbl_FADT.sci_interrupt)
578 return AE_BAD_PARAMETER;
579
580 free_irq(irq, acpi_irq);
581 acpi_irq_handler = NULL;
582
583 return AE_OK;
584}
585
586/*
587 * Running in interpreter thread context, safe to sleep
588 */
589
590void acpi_os_sleep(u64 ms)
591{
592 schedule_timeout_interruptible(msecs_to_jiffies(ms));
593}
594
595void acpi_os_stall(u32 us)
596{
597 while (us) {
598 u32 delay = 1000;
599
600 if (delay > us)
601 delay = us;
602 udelay(delay);
603 touch_nmi_watchdog();
604 us -= delay;
605 }
606}
607
608/*
609 * Support ACPI 3.0 AML Timer operand
610 * Returns 64-bit free-running, monotonically increasing timer
611 * with 100ns granularity
612 */
613u64 acpi_os_get_timer(void)
614{
615 static u64 t;
616
617#ifdef CONFIG_HPET
618 /* TBD: use HPET if available */
619#endif
620
621#ifdef CONFIG_X86_PM_TIMER
622 /* TBD: default to PM timer if HPET was not available */
623#endif
624 if (!t)
625 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
626
627 return ++t;
628}
629
630acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
631{
632 u32 dummy;
633
634 if (!value)
635 value = &dummy;
636
637 *value = 0;
638 if (width <= 8) {
639 *(u8 *) value = inb(port);
640 } else if (width <= 16) {
641 *(u16 *) value = inw(port);
642 } else if (width <= 32) {
643 *(u32 *) value = inl(port);
644 } else {
645 BUG();
646 }
647
648 return AE_OK;
649}
650
651EXPORT_SYMBOL(acpi_os_read_port);
652
653acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
654{
655 if (width <= 8) {
656 outb(value, port);
657 } else if (width <= 16) {
658 outw(value, port);
659 } else if (width <= 32) {
660 outl(value, port);
661 } else {
662 BUG();
663 }
664
665 return AE_OK;
666}
667
668EXPORT_SYMBOL(acpi_os_write_port);
669
670acpi_status
671acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
672{
673 void __iomem *virt_addr;
674 unsigned int size = width / 8;
675 bool unmap = false;
676 u32 dummy;
677
678 rcu_read_lock();
679 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
680 if (!virt_addr) {
681 rcu_read_unlock();
682 virt_addr = acpi_os_ioremap(phys_addr, size);
683 if (!virt_addr)
684 return AE_BAD_ADDRESS;
685 unmap = true;
686 }
687
688 if (!value)
689 value = &dummy;
690
691 switch (width) {
692 case 8:
693 *(u8 *) value = readb(virt_addr);
694 break;
695 case 16:
696 *(u16 *) value = readw(virt_addr);
697 break;
698 case 32:
699 *(u32 *) value = readl(virt_addr);
700 break;
701 default:
702 BUG();
703 }
704
705 if (unmap)
706 iounmap(virt_addr);
707 else
708 rcu_read_unlock();
709
710 return AE_OK;
711}
712
713acpi_status
714acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
715{
716 void __iomem *virt_addr;
717 unsigned int size = width / 8;
718 bool unmap = false;
719
720 rcu_read_lock();
721 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
722 if (!virt_addr) {
723 rcu_read_unlock();
724 virt_addr = acpi_os_ioremap(phys_addr, size);
725 if (!virt_addr)
726 return AE_BAD_ADDRESS;
727 unmap = true;
728 }
729
730 switch (width) {
731 case 8:
732 writeb(value, virt_addr);
733 break;
734 case 16:
735 writew(value, virt_addr);
736 break;
737 case 32:
738 writel(value, virt_addr);
739 break;
740 default:
741 BUG();
742 }
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_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
754 u64 *value, u32 width)
755{
756 int result, size;
757 u32 value32;
758
759 if (!value)
760 return AE_BAD_PARAMETER;
761
762 switch (width) {
763 case 8:
764 size = 1;
765 break;
766 case 16:
767 size = 2;
768 break;
769 case 32:
770 size = 4;
771 break;
772 default:
773 return AE_ERROR;
774 }
775
776 result = raw_pci_read(pci_id->segment, pci_id->bus,
777 PCI_DEVFN(pci_id->device, pci_id->function),
778 reg, size, &value32);
779 *value = value32;
780
781 return (result ? AE_ERROR : AE_OK);
782}
783
784acpi_status
785acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
786 u64 value, u32 width)
787{
788 int result, size;
789
790 switch (width) {
791 case 8:
792 size = 1;
793 break;
794 case 16:
795 size = 2;
796 break;
797 case 32:
798 size = 4;
799 break;
800 default:
801 return AE_ERROR;
802 }
803
804 result = raw_pci_write(pci_id->segment, pci_id->bus,
805 PCI_DEVFN(pci_id->device, pci_id->function),
806 reg, size, value);
807
808 return (result ? AE_ERROR : AE_OK);
809}
810
811static void acpi_os_execute_deferred(struct work_struct *work)
812{
813 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
814
815 if (dpc->wait)
816 acpi_os_wait_events_complete(NULL);
817
818 dpc->function(dpc->context);
819 kfree(dpc);
820}
821
822/*******************************************************************************
823 *
824 * FUNCTION: acpi_os_execute
825 *
826 * PARAMETERS: Type - Type of the callback
827 * Function - Function to be executed
828 * Context - Function parameters
829 *
830 * RETURN: Status
831 *
832 * DESCRIPTION: Depending on type, either queues function for deferred execution or
833 * immediately executes function on a separate thread.
834 *
835 ******************************************************************************/
836
837static acpi_status __acpi_os_execute(acpi_execute_type type,
838 acpi_osd_exec_callback function, void *context, int hp)
839{
840 acpi_status status = AE_OK;
841 struct acpi_os_dpc *dpc;
842 struct workqueue_struct *queue;
843 int ret;
844 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
845 "Scheduling function [%p(%p)] for deferred execution.\n",
846 function, context));
847
848 /*
849 * Allocate/initialize DPC structure. Note that this memory will be
850 * freed by the callee. The kernel handles the work_struct list in a
851 * way that allows us to also free its memory inside the callee.
852 * Because we may want to schedule several tasks with different
853 * parameters we can't use the approach some kernel code uses of
854 * having a static work_struct.
855 */
856
857 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
858 if (!dpc)
859 return AE_NO_MEMORY;
860
861 dpc->function = function;
862 dpc->context = context;
863
864 /*
865 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
866 * because the hotplug code may call driver .remove() functions,
867 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
868 * to flush these workqueues.
869 */
870 queue = hp ? kacpi_hotplug_wq :
871 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
872 dpc->wait = hp ? 1 : 0;
873
874 if (queue == kacpi_hotplug_wq)
875 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
876 else if (queue == kacpi_notify_wq)
877 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
878 else
879 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
880
881 /*
882 * On some machines, a software-initiated SMI causes corruption unless
883 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
884 * typically it's done in GPE-related methods that are run via
885 * workqueues, so we can avoid the known corruption cases by always
886 * queueing on CPU 0.
887 */
888 ret = queue_work_on(0, queue, &dpc->work);
889
890 if (!ret) {
891 printk(KERN_ERR PREFIX
892 "Call to queue_work() failed.\n");
893 status = AE_ERROR;
894 kfree(dpc);
895 }
896 return status;
897}
898
899acpi_status acpi_os_execute(acpi_execute_type type,
900 acpi_osd_exec_callback function, void *context)
901{
902 return __acpi_os_execute(type, function, context, 0);
903}
904EXPORT_SYMBOL(acpi_os_execute);
905
906acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
907 void *context)
908{
909 return __acpi_os_execute(0, function, context, 1);
910}
911
912void acpi_os_wait_events_complete(void *context)
913{
914 flush_workqueue(kacpid_wq);
915 flush_workqueue(kacpi_notify_wq);
916}
917
918EXPORT_SYMBOL(acpi_os_wait_events_complete);
919
920acpi_status
921acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
922{
923 struct semaphore *sem = NULL;
924
925 sem = acpi_os_allocate(sizeof(struct semaphore));
926 if (!sem)
927 return AE_NO_MEMORY;
928 memset(sem, 0, sizeof(struct semaphore));
929
930 sema_init(sem, initial_units);
931
932 *handle = (acpi_handle *) sem;
933
934 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
935 *handle, initial_units));
936
937 return AE_OK;
938}
939
940/*
941 * TODO: A better way to delete semaphores? Linux doesn't have a
942 * 'delete_semaphore()' function -- may result in an invalid
943 * pointer dereference for non-synchronized consumers. Should
944 * we at least check for blocked threads and signal/cancel them?
945 */
946
947acpi_status acpi_os_delete_semaphore(acpi_handle handle)
948{
949 struct semaphore *sem = (struct semaphore *)handle;
950
951 if (!sem)
952 return AE_BAD_PARAMETER;
953
954 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
955
956 BUG_ON(!list_empty(&sem->wait_list));
957 kfree(sem);
958 sem = NULL;
959
960 return AE_OK;
961}
962
963/*
964 * TODO: Support for units > 1?
965 */
966acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
967{
968 acpi_status status = AE_OK;
969 struct semaphore *sem = (struct semaphore *)handle;
970 long jiffies;
971 int ret = 0;
972
973 if (!sem || (units < 1))
974 return AE_BAD_PARAMETER;
975
976 if (units > 1)
977 return AE_SUPPORT;
978
979 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
980 handle, units, timeout));
981
982 if (timeout == ACPI_WAIT_FOREVER)
983 jiffies = MAX_SCHEDULE_TIMEOUT;
984 else
985 jiffies = msecs_to_jiffies(timeout);
986
987 ret = down_timeout(sem, jiffies);
988 if (ret)
989 status = AE_TIME;
990
991 if (ACPI_FAILURE(status)) {
992 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
993 "Failed to acquire semaphore[%p|%d|%d], %s",
994 handle, units, timeout,
995 acpi_format_exception(status)));
996 } else {
997 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
998 "Acquired semaphore[%p|%d|%d]", handle,
999 units, timeout));
1000 }
1001
1002 return status;
1003}
1004
1005/*
1006 * TODO: Support for units > 1?
1007 */
1008acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1009{
1010 struct semaphore *sem = (struct semaphore *)handle;
1011
1012 if (!sem || (units < 1))
1013 return AE_BAD_PARAMETER;
1014
1015 if (units > 1)
1016 return AE_SUPPORT;
1017
1018 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1019 units));
1020
1021 up(sem);
1022
1023 return AE_OK;
1024}
1025
1026#ifdef ACPI_FUTURE_USAGE
1027u32 acpi_os_get_line(char *buffer)
1028{
1029
1030#ifdef ENABLE_DEBUGGER
1031 if (acpi_in_debugger) {
1032 u32 chars;
1033
1034 kdb_read(buffer, sizeof(line_buf));
1035
1036 /* remove the CR kdb includes */
1037 chars = strlen(buffer) - 1;
1038 buffer[chars] = '\0';
1039 }
1040#endif
1041
1042 return 0;
1043}
1044#endif /* ACPI_FUTURE_USAGE */
1045
1046acpi_status acpi_os_signal(u32 function, void *info)
1047{
1048 switch (function) {
1049 case ACPI_SIGNAL_FATAL:
1050 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1051 break;
1052 case ACPI_SIGNAL_BREAKPOINT:
1053 /*
1054 * AML Breakpoint
1055 * ACPI spec. says to treat it as a NOP unless
1056 * you are debugging. So if/when we integrate
1057 * AML debugger into the kernel debugger its
1058 * hook will go here. But until then it is
1059 * not useful to print anything on breakpoints.
1060 */
1061 break;
1062 default:
1063 break;
1064 }
1065
1066 return AE_OK;
1067}
1068
1069static int __init acpi_os_name_setup(char *str)
1070{
1071 char *p = acpi_os_name;
1072 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1073
1074 if (!str || !*str)
1075 return 0;
1076
1077 for (; count-- && str && *str; str++) {
1078 if (isalnum(*str) || *str == ' ' || *str == ':')
1079 *p++ = *str;
1080 else if (*str == '\'' || *str == '"')
1081 continue;
1082 else
1083 break;
1084 }
1085 *p = 0;
1086
1087 return 1;
1088
1089}
1090
1091__setup("acpi_os_name=", acpi_os_name_setup);
1092
1093#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1094#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1095
1096struct osi_setup_entry {
1097 char string[OSI_STRING_LENGTH_MAX];
1098 bool enable;
1099};
1100
1101static struct osi_setup_entry __initdata
1102 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1103 {"Module Device", true},
1104 {"Processor Device", true},
1105 {"3.0 _SCP Extensions", true},
1106 {"Processor Aggregator Device", true},
1107};
1108
1109void __init acpi_osi_setup(char *str)
1110{
1111 struct osi_setup_entry *osi;
1112 bool enable = true;
1113 int i;
1114
1115 if (!acpi_gbl_create_osi_method)
1116 return;
1117
1118 if (str == NULL || *str == '\0') {
1119 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1120 acpi_gbl_create_osi_method = FALSE;
1121 return;
1122 }
1123
1124 if (*str == '!') {
1125 str++;
1126 enable = false;
1127 }
1128
1129 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1130 osi = &osi_setup_entries[i];
1131 if (!strcmp(osi->string, str)) {
1132 osi->enable = enable;
1133 break;
1134 } else if (osi->string[0] == '\0') {
1135 osi->enable = enable;
1136 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1137 break;
1138 }
1139 }
1140}
1141
1142static void __init set_osi_linux(unsigned int enable)
1143{
1144 if (osi_linux.enable != enable)
1145 osi_linux.enable = enable;
1146
1147 if (osi_linux.enable)
1148 acpi_osi_setup("Linux");
1149 else
1150 acpi_osi_setup("!Linux");
1151
1152 return;
1153}
1154
1155static void __init acpi_cmdline_osi_linux(unsigned int enable)
1156{
1157 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1158 osi_linux.dmi = 0;
1159 set_osi_linux(enable);
1160
1161 return;
1162}
1163
1164void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1165{
1166 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1167
1168 if (enable == -1)
1169 return;
1170
1171 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1172 set_osi_linux(enable);
1173
1174 return;
1175}
1176
1177/*
1178 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1179 *
1180 * empty string disables _OSI
1181 * string starting with '!' disables that string
1182 * otherwise string is added to list, augmenting built-in strings
1183 */
1184static void __init acpi_osi_setup_late(void)
1185{
1186 struct osi_setup_entry *osi;
1187 char *str;
1188 int i;
1189 acpi_status status;
1190
1191 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1192 osi = &osi_setup_entries[i];
1193 str = osi->string;
1194
1195 if (*str == '\0')
1196 break;
1197 if (osi->enable) {
1198 status = acpi_install_interface(str);
1199
1200 if (ACPI_SUCCESS(status))
1201 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1202 } else {
1203 status = acpi_remove_interface(str);
1204
1205 if (ACPI_SUCCESS(status))
1206 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1207 }
1208 }
1209}
1210
1211static int __init osi_setup(char *str)
1212{
1213 if (str && !strcmp("Linux", str))
1214 acpi_cmdline_osi_linux(1);
1215 else if (str && !strcmp("!Linux", str))
1216 acpi_cmdline_osi_linux(0);
1217 else
1218 acpi_osi_setup(str);
1219
1220 return 1;
1221}
1222
1223__setup("acpi_osi=", osi_setup);
1224
1225/* enable serialization to combat AE_ALREADY_EXISTS errors */
1226static int __init acpi_serialize_setup(char *str)
1227{
1228 printk(KERN_INFO PREFIX "serialize enabled\n");
1229
1230 acpi_gbl_all_methods_serialized = TRUE;
1231
1232 return 1;
1233}
1234
1235__setup("acpi_serialize", acpi_serialize_setup);
1236
1237/* Check of resource interference between native drivers and ACPI
1238 * OperationRegions (SystemIO and System Memory only).
1239 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1240 * in arbitrary AML code and can interfere with legacy drivers.
1241 * acpi_enforce_resources= can be set to:
1242 *
1243 * - strict (default) (2)
1244 * -> further driver trying to access the resources will not load
1245 * - lax (1)
1246 * -> further driver trying to access the resources will load, but you
1247 * get a system message that something might go wrong...
1248 *
1249 * - no (0)
1250 * -> ACPI Operation Region resources will not be registered
1251 *
1252 */
1253#define ENFORCE_RESOURCES_STRICT 2
1254#define ENFORCE_RESOURCES_LAX 1
1255#define ENFORCE_RESOURCES_NO 0
1256
1257static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1258
1259static int __init acpi_enforce_resources_setup(char *str)
1260{
1261 if (str == NULL || *str == '\0')
1262 return 0;
1263
1264 if (!strcmp("strict", str))
1265 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1266 else if (!strcmp("lax", str))
1267 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1268 else if (!strcmp("no", str))
1269 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1270
1271 return 1;
1272}
1273
1274__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1275
1276/* Check for resource conflicts between ACPI OperationRegions and native
1277 * drivers */
1278int acpi_check_resource_conflict(const struct resource *res)
1279{
1280 struct acpi_res_list *res_list_elem;
1281 int ioport = 0, clash = 0;
1282
1283 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1284 return 0;
1285 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1286 return 0;
1287
1288 ioport = res->flags & IORESOURCE_IO;
1289
1290 spin_lock(&acpi_res_lock);
1291 list_for_each_entry(res_list_elem, &resource_list_head,
1292 resource_list) {
1293 if (ioport && (res_list_elem->resource_type
1294 != ACPI_ADR_SPACE_SYSTEM_IO))
1295 continue;
1296 if (!ioport && (res_list_elem->resource_type
1297 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1298 continue;
1299
1300 if (res->end < res_list_elem->start
1301 || res_list_elem->end < res->start)
1302 continue;
1303 clash = 1;
1304 break;
1305 }
1306 spin_unlock(&acpi_res_lock);
1307
1308 if (clash) {
1309 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1310 printk(KERN_WARNING "ACPI: resource %s %pR"
1311 " conflicts with ACPI region %s "
1312 "[%s 0x%zx-0x%zx]\n",
1313 res->name, res, res_list_elem->name,
1314 (res_list_elem->resource_type ==
1315 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1316 (size_t) res_list_elem->start,
1317 (size_t) res_list_elem->end);
1318 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1319 printk(KERN_NOTICE "ACPI: This conflict may"
1320 " cause random problems and system"
1321 " instability\n");
1322 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1323 " for this device, you should use it instead of"
1324 " the native driver\n");
1325 }
1326 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1327 return -EBUSY;
1328 }
1329 return 0;
1330}
1331EXPORT_SYMBOL(acpi_check_resource_conflict);
1332
1333int acpi_check_region(resource_size_t start, resource_size_t n,
1334 const char *name)
1335{
1336 struct resource res = {
1337 .start = start,
1338 .end = start + n - 1,
1339 .name = name,
1340 .flags = IORESOURCE_IO,
1341 };
1342
1343 return acpi_check_resource_conflict(&res);
1344}
1345EXPORT_SYMBOL(acpi_check_region);
1346
1347/*
1348 * Let drivers know whether the resource checks are effective
1349 */
1350int acpi_resources_are_enforced(void)
1351{
1352 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1353}
1354EXPORT_SYMBOL(acpi_resources_are_enforced);
1355
1356/*
1357 * Deallocate the memory for a spinlock.
1358 */
1359void acpi_os_delete_lock(acpi_spinlock handle)
1360{
1361 ACPI_FREE(handle);
1362}
1363
1364/*
1365 * Acquire a spinlock.
1366 *
1367 * handle is a pointer to the spinlock_t.
1368 */
1369
1370acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1371{
1372 acpi_cpu_flags flags;
1373 spin_lock_irqsave(lockp, flags);
1374 return flags;
1375}
1376
1377/*
1378 * Release a spinlock. See above.
1379 */
1380
1381void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1382{
1383 spin_unlock_irqrestore(lockp, flags);
1384}
1385
1386#ifndef ACPI_USE_LOCAL_CACHE
1387
1388/*******************************************************************************
1389 *
1390 * FUNCTION: acpi_os_create_cache
1391 *
1392 * PARAMETERS: name - Ascii name for the cache
1393 * size - Size of each cached object
1394 * depth - Maximum depth of the cache (in objects) <ignored>
1395 * cache - Where the new cache object is returned
1396 *
1397 * RETURN: status
1398 *
1399 * DESCRIPTION: Create a cache object
1400 *
1401 ******************************************************************************/
1402
1403acpi_status
1404acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1405{
1406 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1407 if (*cache == NULL)
1408 return AE_ERROR;
1409 else
1410 return AE_OK;
1411}
1412
1413/*******************************************************************************
1414 *
1415 * FUNCTION: acpi_os_purge_cache
1416 *
1417 * PARAMETERS: Cache - Handle to cache object
1418 *
1419 * RETURN: Status
1420 *
1421 * DESCRIPTION: Free all objects within the requested cache.
1422 *
1423 ******************************************************************************/
1424
1425acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1426{
1427 kmem_cache_shrink(cache);
1428 return (AE_OK);
1429}
1430
1431/*******************************************************************************
1432 *
1433 * FUNCTION: acpi_os_delete_cache
1434 *
1435 * PARAMETERS: Cache - Handle to cache object
1436 *
1437 * RETURN: Status
1438 *
1439 * DESCRIPTION: Free all objects within the requested cache and delete the
1440 * cache object.
1441 *
1442 ******************************************************************************/
1443
1444acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1445{
1446 kmem_cache_destroy(cache);
1447 return (AE_OK);
1448}
1449
1450/*******************************************************************************
1451 *
1452 * FUNCTION: acpi_os_release_object
1453 *
1454 * PARAMETERS: Cache - Handle to cache object
1455 * Object - The object to be released
1456 *
1457 * RETURN: None
1458 *
1459 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1460 * the object is deleted.
1461 *
1462 ******************************************************************************/
1463
1464acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1465{
1466 kmem_cache_free(cache, object);
1467 return (AE_OK);
1468}
1469
1470static inline int acpi_res_list_add(struct acpi_res_list *res)
1471{
1472 struct acpi_res_list *res_list_elem;
1473
1474 list_for_each_entry(res_list_elem, &resource_list_head,
1475 resource_list) {
1476
1477 if (res->resource_type == res_list_elem->resource_type &&
1478 res->start == res_list_elem->start &&
1479 res->end == res_list_elem->end) {
1480
1481 /*
1482 * The Region(addr,len) already exist in the list,
1483 * just increase the count
1484 */
1485
1486 res_list_elem->count++;
1487 return 0;
1488 }
1489 }
1490
1491 res->count = 1;
1492 list_add(&res->resource_list, &resource_list_head);
1493 return 1;
1494}
1495
1496static inline void acpi_res_list_del(struct acpi_res_list *res)
1497{
1498 struct acpi_res_list *res_list_elem;
1499
1500 list_for_each_entry(res_list_elem, &resource_list_head,
1501 resource_list) {
1502
1503 if (res->resource_type == res_list_elem->resource_type &&
1504 res->start == res_list_elem->start &&
1505 res->end == res_list_elem->end) {
1506
1507 /*
1508 * If the res count is decreased to 0,
1509 * remove and free it
1510 */
1511
1512 if (--res_list_elem->count == 0) {
1513 list_del(&res_list_elem->resource_list);
1514 kfree(res_list_elem);
1515 }
1516 return;
1517 }
1518 }
1519}
1520
1521acpi_status
1522acpi_os_invalidate_address(
1523 u8 space_id,
1524 acpi_physical_address address,
1525 acpi_size length)
1526{
1527 struct acpi_res_list res;
1528
1529 switch (space_id) {
1530 case ACPI_ADR_SPACE_SYSTEM_IO:
1531 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1532 /* Only interference checks against SystemIO and SystemMemory
1533 are needed */
1534 res.start = address;
1535 res.end = address + length - 1;
1536 res.resource_type = space_id;
1537 spin_lock(&acpi_res_lock);
1538 acpi_res_list_del(&res);
1539 spin_unlock(&acpi_res_lock);
1540 break;
1541 case ACPI_ADR_SPACE_PCI_CONFIG:
1542 case ACPI_ADR_SPACE_EC:
1543 case ACPI_ADR_SPACE_SMBUS:
1544 case ACPI_ADR_SPACE_CMOS:
1545 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1546 case ACPI_ADR_SPACE_DATA_TABLE:
1547 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1548 break;
1549 }
1550 return AE_OK;
1551}
1552
1553/******************************************************************************
1554 *
1555 * FUNCTION: acpi_os_validate_address
1556 *
1557 * PARAMETERS: space_id - ACPI space ID
1558 * address - Physical address
1559 * length - Address length
1560 *
1561 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1562 * should return AE_AML_ILLEGAL_ADDRESS.
1563 *
1564 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1565 * the addresses accessed by AML operation regions.
1566 *
1567 *****************************************************************************/
1568
1569acpi_status
1570acpi_os_validate_address (
1571 u8 space_id,
1572 acpi_physical_address address,
1573 acpi_size length,
1574 char *name)
1575{
1576 struct acpi_res_list *res;
1577 int added;
1578 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1579 return AE_OK;
1580
1581 switch (space_id) {
1582 case ACPI_ADR_SPACE_SYSTEM_IO:
1583 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1584 /* Only interference checks against SystemIO and SystemMemory
1585 are needed */
1586 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1587 if (!res)
1588 return AE_OK;
1589 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1590 strlcpy(res->name, name, 5);
1591 res->start = address;
1592 res->end = address + length - 1;
1593 res->resource_type = space_id;
1594 spin_lock(&acpi_res_lock);
1595 added = acpi_res_list_add(res);
1596 spin_unlock(&acpi_res_lock);
1597 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1598 "name: %s\n", added ? "Added" : "Already exist",
1599 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1600 ? "SystemIO" : "System Memory",
1601 (unsigned long long)res->start,
1602 (unsigned long long)res->end,
1603 res->name);
1604 if (!added)
1605 kfree(res);
1606 break;
1607 case ACPI_ADR_SPACE_PCI_CONFIG:
1608 case ACPI_ADR_SPACE_EC:
1609 case ACPI_ADR_SPACE_SMBUS:
1610 case ACPI_ADR_SPACE_CMOS:
1611 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1612 case ACPI_ADR_SPACE_DATA_TABLE:
1613 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1614 break;
1615 }
1616 return AE_OK;
1617}
1618#endif
1619
1620acpi_status __init acpi_os_initialize(void)
1621{
1622 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1623 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1624 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1625 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1626
1627 return AE_OK;
1628}
1629
1630acpi_status __init acpi_os_initialize1(void)
1631{
1632 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1633 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1634 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1635 BUG_ON(!kacpid_wq);
1636 BUG_ON(!kacpi_notify_wq);
1637 BUG_ON(!kacpi_hotplug_wq);
1638 acpi_install_interface_handler(acpi_osi_handler);
1639 acpi_osi_setup_late();
1640 return AE_OK;
1641}
1642
1643acpi_status acpi_os_terminate(void)
1644{
1645 if (acpi_irq_handler) {
1646 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1647 acpi_irq_handler);
1648 }
1649
1650 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1651 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1652 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1653 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1654
1655 destroy_workqueue(kacpid_wq);
1656 destroy_workqueue(kacpi_notify_wq);
1657 destroy_workqueue(kacpi_hotplug_wq);
1658
1659 return AE_OK;
1660}
1/*
2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3 *
4 * Copyright (C) 2000 Andrew Henroid
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (c) 2008 Intel Corporation
8 * Author: Matthew Wilcox <willy@linux.intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 *
28 */
29
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/slab.h>
33#include <linux/mm.h>
34#include <linux/highmem.h>
35#include <linux/pci.h>
36#include <linux/interrupt.h>
37#include <linux/kmod.h>
38#include <linux/delay.h>
39#include <linux/workqueue.h>
40#include <linux/nmi.h>
41#include <linux/acpi.h>
42#include <linux/efi.h>
43#include <linux/ioport.h>
44#include <linux/list.h>
45#include <linux/jiffies.h>
46#include <linux/semaphore.h>
47
48#include <asm/io.h>
49#include <asm/uaccess.h>
50
51#include "internal.h"
52
53#define _COMPONENT ACPI_OS_SERVICES
54ACPI_MODULE_NAME("osl");
55
56struct acpi_os_dpc {
57 acpi_osd_exec_callback function;
58 void *context;
59 struct work_struct work;
60};
61
62#ifdef CONFIG_ACPI_CUSTOM_DSDT
63#include CONFIG_ACPI_CUSTOM_DSDT_FILE
64#endif
65
66#ifdef ENABLE_DEBUGGER
67#include <linux/kdb.h>
68
69/* stuff for debugger support */
70int acpi_in_debugger;
71EXPORT_SYMBOL(acpi_in_debugger);
72
73extern char line_buf[80];
74#endif /*ENABLE_DEBUGGER */
75
76static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
77 u32 pm1b_ctrl);
78static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
79 u32 val_b);
80
81static acpi_osd_handler acpi_irq_handler;
82static void *acpi_irq_context;
83static struct workqueue_struct *kacpid_wq;
84static struct workqueue_struct *kacpi_notify_wq;
85static struct workqueue_struct *kacpi_hotplug_wq;
86
87/*
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
90 */
91struct acpi_ioremap {
92 struct list_head list;
93 void __iomem *virt;
94 acpi_physical_address phys;
95 acpi_size size;
96 unsigned long refcount;
97};
98
99static LIST_HEAD(acpi_ioremaps);
100static DEFINE_MUTEX(acpi_ioremap_lock);
101
102static void __init acpi_osi_setup_late(void);
103
104/*
105 * The story of _OSI(Linux)
106 *
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
109 *
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
114 *
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
126 *
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
129 *
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
135 */
136
137static struct osi_linux {
138 unsigned int enable:1;
139 unsigned int dmi:1;
140 unsigned int cmdline:1;
141 unsigned int default_disabling:1;
142} osi_linux = {0, 0, 0, 0};
143
144static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145{
146 if (!strcmp("Linux", interface)) {
147
148 printk_once(KERN_NOTICE FW_BUG PREFIX
149 "BIOS _OSI(Linux) query %s%s\n",
150 osi_linux.enable ? "honored" : "ignored",
151 osi_linux.cmdline ? " via cmdline" :
152 osi_linux.dmi ? " via DMI" : "");
153 }
154
155 return supported;
156}
157
158static void __init acpi_request_region (struct acpi_generic_address *gas,
159 unsigned int length, char *desc)
160{
161 u64 addr;
162
163 /* Handle possible alignment issues */
164 memcpy(&addr, &gas->address, sizeof(addr));
165 if (!addr || !length)
166 return;
167
168 /* Resources are never freed */
169 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
170 request_region(addr, length, desc);
171 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
172 request_mem_region(addr, length, desc);
173}
174
175static int __init acpi_reserve_resources(void)
176{
177 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
178 "ACPI PM1a_EVT_BLK");
179
180 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
181 "ACPI PM1b_EVT_BLK");
182
183 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
184 "ACPI PM1a_CNT_BLK");
185
186 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
187 "ACPI PM1b_CNT_BLK");
188
189 if (acpi_gbl_FADT.pm_timer_length == 4)
190 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191
192 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
193 "ACPI PM2_CNT_BLK");
194
195 /* Length of GPE blocks must be a non-negative multiple of 2 */
196
197 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
198 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
199 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200
201 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
202 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
203 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
204
205 return 0;
206}
207device_initcall(acpi_reserve_resources);
208
209void acpi_os_printf(const char *fmt, ...)
210{
211 va_list args;
212 va_start(args, fmt);
213 acpi_os_vprintf(fmt, args);
214 va_end(args);
215}
216
217void acpi_os_vprintf(const char *fmt, va_list args)
218{
219 static char buffer[512];
220
221 vsprintf(buffer, fmt, args);
222
223#ifdef ENABLE_DEBUGGER
224 if (acpi_in_debugger) {
225 kdb_printf("%s", buffer);
226 } else {
227 printk(KERN_CONT "%s", buffer);
228 }
229#else
230 printk(KERN_CONT "%s", buffer);
231#endif
232}
233
234#ifdef CONFIG_KEXEC
235static unsigned long acpi_rsdp;
236static int __init setup_acpi_rsdp(char *arg)
237{
238 acpi_rsdp = simple_strtoul(arg, NULL, 16);
239 return 0;
240}
241early_param("acpi_rsdp", setup_acpi_rsdp);
242#endif
243
244acpi_physical_address __init acpi_os_get_root_pointer(void)
245{
246#ifdef CONFIG_KEXEC
247 if (acpi_rsdp)
248 return acpi_rsdp;
249#endif
250
251 if (efi_enabled(EFI_CONFIG_TABLES)) {
252 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
253 return efi.acpi20;
254 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
255 return efi.acpi;
256 else {
257 printk(KERN_ERR PREFIX
258 "System description tables not found\n");
259 return 0;
260 }
261 } else {
262 acpi_physical_address pa = 0;
263
264 acpi_find_root_pointer(&pa);
265 return pa;
266 }
267}
268
269/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
270static struct acpi_ioremap *
271acpi_map_lookup(acpi_physical_address phys, acpi_size size)
272{
273 struct acpi_ioremap *map;
274
275 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
276 if (map->phys <= phys &&
277 phys + size <= map->phys + map->size)
278 return map;
279
280 return NULL;
281}
282
283/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
284static void __iomem *
285acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
286{
287 struct acpi_ioremap *map;
288
289 map = acpi_map_lookup(phys, size);
290 if (map)
291 return map->virt + (phys - map->phys);
292
293 return NULL;
294}
295
296void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
297{
298 struct acpi_ioremap *map;
299 void __iomem *virt = NULL;
300
301 mutex_lock(&acpi_ioremap_lock);
302 map = acpi_map_lookup(phys, size);
303 if (map) {
304 virt = map->virt + (phys - map->phys);
305 map->refcount++;
306 }
307 mutex_unlock(&acpi_ioremap_lock);
308 return virt;
309}
310EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
311
312/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
313static struct acpi_ioremap *
314acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
315{
316 struct acpi_ioremap *map;
317
318 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
319 if (map->virt <= virt &&
320 virt + size <= map->virt + map->size)
321 return map;
322
323 return NULL;
324}
325
326#ifndef CONFIG_IA64
327#define should_use_kmap(pfn) page_is_ram(pfn)
328#else
329/* ioremap will take care of cache attributes */
330#define should_use_kmap(pfn) 0
331#endif
332
333static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
334{
335 unsigned long pfn;
336
337 pfn = pg_off >> PAGE_SHIFT;
338 if (should_use_kmap(pfn)) {
339 if (pg_sz > PAGE_SIZE)
340 return NULL;
341 return (void __iomem __force *)kmap(pfn_to_page(pfn));
342 } else
343 return acpi_os_ioremap(pg_off, pg_sz);
344}
345
346static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
347{
348 unsigned long pfn;
349
350 pfn = pg_off >> PAGE_SHIFT;
351 if (should_use_kmap(pfn))
352 kunmap(pfn_to_page(pfn));
353 else
354 iounmap(vaddr);
355}
356
357void __iomem *__init_refok
358acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
359{
360 struct acpi_ioremap *map;
361 void __iomem *virt;
362 acpi_physical_address pg_off;
363 acpi_size pg_sz;
364
365 if (phys > ULONG_MAX) {
366 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
367 return NULL;
368 }
369
370 if (!acpi_gbl_permanent_mmap)
371 return __acpi_map_table((unsigned long)phys, size);
372
373 mutex_lock(&acpi_ioremap_lock);
374 /* Check if there's a suitable mapping already. */
375 map = acpi_map_lookup(phys, size);
376 if (map) {
377 map->refcount++;
378 goto out;
379 }
380
381 map = kzalloc(sizeof(*map), GFP_KERNEL);
382 if (!map) {
383 mutex_unlock(&acpi_ioremap_lock);
384 return NULL;
385 }
386
387 pg_off = round_down(phys, PAGE_SIZE);
388 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
389 virt = acpi_map(pg_off, pg_sz);
390 if (!virt) {
391 mutex_unlock(&acpi_ioremap_lock);
392 kfree(map);
393 return NULL;
394 }
395
396 INIT_LIST_HEAD(&map->list);
397 map->virt = virt;
398 map->phys = pg_off;
399 map->size = pg_sz;
400 map->refcount = 1;
401
402 list_add_tail_rcu(&map->list, &acpi_ioremaps);
403
404 out:
405 mutex_unlock(&acpi_ioremap_lock);
406 return map->virt + (phys - map->phys);
407}
408EXPORT_SYMBOL_GPL(acpi_os_map_memory);
409
410static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
411{
412 if (!--map->refcount)
413 list_del_rcu(&map->list);
414}
415
416static void acpi_os_map_cleanup(struct acpi_ioremap *map)
417{
418 if (!map->refcount) {
419 synchronize_rcu();
420 acpi_unmap(map->phys, map->virt);
421 kfree(map);
422 }
423}
424
425void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
426{
427 struct acpi_ioremap *map;
428
429 if (!acpi_gbl_permanent_mmap) {
430 __acpi_unmap_table(virt, size);
431 return;
432 }
433
434 mutex_lock(&acpi_ioremap_lock);
435 map = acpi_map_lookup_virt(virt, size);
436 if (!map) {
437 mutex_unlock(&acpi_ioremap_lock);
438 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
439 return;
440 }
441 acpi_os_drop_map_ref(map);
442 mutex_unlock(&acpi_ioremap_lock);
443
444 acpi_os_map_cleanup(map);
445}
446EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
447
448void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
449{
450 if (!acpi_gbl_permanent_mmap)
451 __acpi_unmap_table(virt, size);
452}
453
454int acpi_os_map_generic_address(struct acpi_generic_address *gas)
455{
456 u64 addr;
457 void __iomem *virt;
458
459 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
460 return 0;
461
462 /* Handle possible alignment issues */
463 memcpy(&addr, &gas->address, sizeof(addr));
464 if (!addr || !gas->bit_width)
465 return -EINVAL;
466
467 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
468 if (!virt)
469 return -EIO;
470
471 return 0;
472}
473EXPORT_SYMBOL(acpi_os_map_generic_address);
474
475void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
476{
477 u64 addr;
478 struct acpi_ioremap *map;
479
480 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
481 return;
482
483 /* Handle possible alignment issues */
484 memcpy(&addr, &gas->address, sizeof(addr));
485 if (!addr || !gas->bit_width)
486 return;
487
488 mutex_lock(&acpi_ioremap_lock);
489 map = acpi_map_lookup(addr, gas->bit_width / 8);
490 if (!map) {
491 mutex_unlock(&acpi_ioremap_lock);
492 return;
493 }
494 acpi_os_drop_map_ref(map);
495 mutex_unlock(&acpi_ioremap_lock);
496
497 acpi_os_map_cleanup(map);
498}
499EXPORT_SYMBOL(acpi_os_unmap_generic_address);
500
501#ifdef ACPI_FUTURE_USAGE
502acpi_status
503acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
504{
505 if (!phys || !virt)
506 return AE_BAD_PARAMETER;
507
508 *phys = virt_to_phys(virt);
509
510 return AE_OK;
511}
512#endif
513
514#define ACPI_MAX_OVERRIDE_LEN 100
515
516static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
517
518acpi_status
519acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
520 acpi_string * new_val)
521{
522 if (!init_val || !new_val)
523 return AE_BAD_PARAMETER;
524
525 *new_val = NULL;
526 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
527 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
528 acpi_os_name);
529 *new_val = acpi_os_name;
530 }
531
532 return AE_OK;
533}
534
535#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
536#include <linux/earlycpio.h>
537#include <linux/memblock.h>
538
539static u64 acpi_tables_addr;
540static int all_tables_size;
541
542/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
543static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
544{
545 u8 sum = 0;
546 u8 *end = buffer + length;
547
548 while (buffer < end)
549 sum = (u8) (sum + *(buffer++));
550 return sum;
551}
552
553/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
554static const char * const table_sigs[] = {
555 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
556 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
557 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
558 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
559 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
560 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
561 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
562 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
563 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
564
565#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
566
567#define ACPI_OVERRIDE_TABLES 64
568static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
569
570#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
571
572void __init acpi_initrd_override(void *data, size_t size)
573{
574 int sig, no, table_nr = 0, total_offset = 0;
575 long offset = 0;
576 struct acpi_table_header *table;
577 char cpio_path[32] = "kernel/firmware/acpi/";
578 struct cpio_data file;
579
580 if (data == NULL || size == 0)
581 return;
582
583 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
584 file = find_cpio_data(cpio_path, data, size, &offset);
585 if (!file.data)
586 break;
587
588 data += offset;
589 size -= offset;
590
591 if (file.size < sizeof(struct acpi_table_header)) {
592 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
593 cpio_path, file.name);
594 continue;
595 }
596
597 table = file.data;
598
599 for (sig = 0; table_sigs[sig]; sig++)
600 if (!memcmp(table->signature, table_sigs[sig], 4))
601 break;
602
603 if (!table_sigs[sig]) {
604 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
605 cpio_path, file.name);
606 continue;
607 }
608 if (file.size != table->length) {
609 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
610 cpio_path, file.name);
611 continue;
612 }
613 if (acpi_table_checksum(file.data, table->length)) {
614 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
615 cpio_path, file.name);
616 continue;
617 }
618
619 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
620 table->signature, cpio_path, file.name, table->length);
621
622 all_tables_size += table->length;
623 acpi_initrd_files[table_nr].data = file.data;
624 acpi_initrd_files[table_nr].size = file.size;
625 table_nr++;
626 }
627 if (table_nr == 0)
628 return;
629
630 acpi_tables_addr =
631 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
632 all_tables_size, PAGE_SIZE);
633 if (!acpi_tables_addr) {
634 WARN_ON(1);
635 return;
636 }
637 /*
638 * Only calling e820_add_reserve does not work and the
639 * tables are invalid (memory got used) later.
640 * memblock_reserve works as expected and the tables won't get modified.
641 * But it's not enough on X86 because ioremap will
642 * complain later (used by acpi_os_map_memory) that the pages
643 * that should get mapped are not marked "reserved".
644 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
645 * works fine.
646 */
647 memblock_reserve(acpi_tables_addr, all_tables_size);
648 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
649
650 /*
651 * early_ioremap only can remap 256k one time. If we map all
652 * tables one time, we will hit the limit. Need to map chunks
653 * one by one during copying the same as that in relocate_initrd().
654 */
655 for (no = 0; no < table_nr; no++) {
656 unsigned char *src_p = acpi_initrd_files[no].data;
657 phys_addr_t size = acpi_initrd_files[no].size;
658 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
659 phys_addr_t slop, clen;
660 char *dest_p;
661
662 total_offset += size;
663
664 while (size) {
665 slop = dest_addr & ~PAGE_MASK;
666 clen = size;
667 if (clen > MAP_CHUNK_SIZE - slop)
668 clen = MAP_CHUNK_SIZE - slop;
669 dest_p = early_ioremap(dest_addr & PAGE_MASK,
670 clen + slop);
671 memcpy(dest_p + slop, src_p, clen);
672 early_iounmap(dest_p, clen + slop);
673 src_p += clen;
674 dest_addr += clen;
675 size -= clen;
676 }
677 }
678}
679#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
680
681static void acpi_table_taint(struct acpi_table_header *table)
682{
683 pr_warn(PREFIX
684 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
685 table->signature, table->oem_table_id);
686 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
687}
688
689
690acpi_status
691acpi_os_table_override(struct acpi_table_header * existing_table,
692 struct acpi_table_header ** new_table)
693{
694 if (!existing_table || !new_table)
695 return AE_BAD_PARAMETER;
696
697 *new_table = NULL;
698
699#ifdef CONFIG_ACPI_CUSTOM_DSDT
700 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
701 *new_table = (struct acpi_table_header *)AmlCode;
702#endif
703 if (*new_table != NULL)
704 acpi_table_taint(existing_table);
705 return AE_OK;
706}
707
708acpi_status
709acpi_os_physical_table_override(struct acpi_table_header *existing_table,
710 acpi_physical_address *address,
711 u32 *table_length)
712{
713#ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
714 *table_length = 0;
715 *address = 0;
716 return AE_OK;
717#else
718 int table_offset = 0;
719 struct acpi_table_header *table;
720
721 *table_length = 0;
722 *address = 0;
723
724 if (!acpi_tables_addr)
725 return AE_OK;
726
727 do {
728 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
729 WARN_ON(1);
730 return AE_OK;
731 }
732
733 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
734 ACPI_HEADER_SIZE);
735
736 if (table_offset + table->length > all_tables_size) {
737 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
738 WARN_ON(1);
739 return AE_OK;
740 }
741
742 table_offset += table->length;
743
744 if (memcmp(existing_table->signature, table->signature, 4)) {
745 acpi_os_unmap_memory(table,
746 ACPI_HEADER_SIZE);
747 continue;
748 }
749
750 /* Only override tables with matching oem id */
751 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
752 ACPI_OEM_TABLE_ID_SIZE)) {
753 acpi_os_unmap_memory(table,
754 ACPI_HEADER_SIZE);
755 continue;
756 }
757
758 table_offset -= table->length;
759 *table_length = table->length;
760 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
761 *address = acpi_tables_addr + table_offset;
762 break;
763 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
764
765 if (*address != 0)
766 acpi_table_taint(existing_table);
767 return AE_OK;
768#endif
769}
770
771static irqreturn_t acpi_irq(int irq, void *dev_id)
772{
773 u32 handled;
774
775 handled = (*acpi_irq_handler) (acpi_irq_context);
776
777 if (handled) {
778 acpi_irq_handled++;
779 return IRQ_HANDLED;
780 } else {
781 acpi_irq_not_handled++;
782 return IRQ_NONE;
783 }
784}
785
786acpi_status
787acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
788 void *context)
789{
790 unsigned int irq;
791
792 acpi_irq_stats_init();
793
794 /*
795 * ACPI interrupts different from the SCI in our copy of the FADT are
796 * not supported.
797 */
798 if (gsi != acpi_gbl_FADT.sci_interrupt)
799 return AE_BAD_PARAMETER;
800
801 if (acpi_irq_handler)
802 return AE_ALREADY_ACQUIRED;
803
804 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
805 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
806 gsi);
807 return AE_OK;
808 }
809
810 acpi_irq_handler = handler;
811 acpi_irq_context = context;
812 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
813 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
814 acpi_irq_handler = NULL;
815 return AE_NOT_ACQUIRED;
816 }
817
818 return AE_OK;
819}
820
821acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
822{
823 if (irq != acpi_gbl_FADT.sci_interrupt)
824 return AE_BAD_PARAMETER;
825
826 free_irq(irq, acpi_irq);
827 acpi_irq_handler = NULL;
828
829 return AE_OK;
830}
831
832/*
833 * Running in interpreter thread context, safe to sleep
834 */
835
836void acpi_os_sleep(u64 ms)
837{
838 msleep(ms);
839}
840
841void acpi_os_stall(u32 us)
842{
843 while (us) {
844 u32 delay = 1000;
845
846 if (delay > us)
847 delay = us;
848 udelay(delay);
849 touch_nmi_watchdog();
850 us -= delay;
851 }
852}
853
854/*
855 * Support ACPI 3.0 AML Timer operand
856 * Returns 64-bit free-running, monotonically increasing timer
857 * with 100ns granularity
858 */
859u64 acpi_os_get_timer(void)
860{
861 u64 time_ns = ktime_to_ns(ktime_get());
862 do_div(time_ns, 100);
863 return time_ns;
864}
865
866acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
867{
868 u32 dummy;
869
870 if (!value)
871 value = &dummy;
872
873 *value = 0;
874 if (width <= 8) {
875 *(u8 *) value = inb(port);
876 } else if (width <= 16) {
877 *(u16 *) value = inw(port);
878 } else if (width <= 32) {
879 *(u32 *) value = inl(port);
880 } else {
881 BUG();
882 }
883
884 return AE_OK;
885}
886
887EXPORT_SYMBOL(acpi_os_read_port);
888
889acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
890{
891 if (width <= 8) {
892 outb(value, port);
893 } else if (width <= 16) {
894 outw(value, port);
895 } else if (width <= 32) {
896 outl(value, port);
897 } else {
898 BUG();
899 }
900
901 return AE_OK;
902}
903
904EXPORT_SYMBOL(acpi_os_write_port);
905
906#ifdef readq
907static inline u64 read64(const volatile void __iomem *addr)
908{
909 return readq(addr);
910}
911#else
912static inline u64 read64(const volatile void __iomem *addr)
913{
914 u64 l, h;
915 l = readl(addr);
916 h = readl(addr+4);
917 return l | (h << 32);
918}
919#endif
920
921acpi_status
922acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
923{
924 void __iomem *virt_addr;
925 unsigned int size = width / 8;
926 bool unmap = false;
927 u64 dummy;
928
929 rcu_read_lock();
930 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
931 if (!virt_addr) {
932 rcu_read_unlock();
933 virt_addr = acpi_os_ioremap(phys_addr, size);
934 if (!virt_addr)
935 return AE_BAD_ADDRESS;
936 unmap = true;
937 }
938
939 if (!value)
940 value = &dummy;
941
942 switch (width) {
943 case 8:
944 *(u8 *) value = readb(virt_addr);
945 break;
946 case 16:
947 *(u16 *) value = readw(virt_addr);
948 break;
949 case 32:
950 *(u32 *) value = readl(virt_addr);
951 break;
952 case 64:
953 *(u64 *) value = read64(virt_addr);
954 break;
955 default:
956 BUG();
957 }
958
959 if (unmap)
960 iounmap(virt_addr);
961 else
962 rcu_read_unlock();
963
964 return AE_OK;
965}
966
967#ifdef writeq
968static inline void write64(u64 val, volatile void __iomem *addr)
969{
970 writeq(val, addr);
971}
972#else
973static inline void write64(u64 val, volatile void __iomem *addr)
974{
975 writel(val, addr);
976 writel(val>>32, addr+4);
977}
978#endif
979
980acpi_status
981acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
982{
983 void __iomem *virt_addr;
984 unsigned int size = width / 8;
985 bool unmap = false;
986
987 rcu_read_lock();
988 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
989 if (!virt_addr) {
990 rcu_read_unlock();
991 virt_addr = acpi_os_ioremap(phys_addr, size);
992 if (!virt_addr)
993 return AE_BAD_ADDRESS;
994 unmap = true;
995 }
996
997 switch (width) {
998 case 8:
999 writeb(value, virt_addr);
1000 break;
1001 case 16:
1002 writew(value, virt_addr);
1003 break;
1004 case 32:
1005 writel(value, virt_addr);
1006 break;
1007 case 64:
1008 write64(value, virt_addr);
1009 break;
1010 default:
1011 BUG();
1012 }
1013
1014 if (unmap)
1015 iounmap(virt_addr);
1016 else
1017 rcu_read_unlock();
1018
1019 return AE_OK;
1020}
1021
1022acpi_status
1023acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1024 u64 *value, u32 width)
1025{
1026 int result, size;
1027 u32 value32;
1028
1029 if (!value)
1030 return AE_BAD_PARAMETER;
1031
1032 switch (width) {
1033 case 8:
1034 size = 1;
1035 break;
1036 case 16:
1037 size = 2;
1038 break;
1039 case 32:
1040 size = 4;
1041 break;
1042 default:
1043 return AE_ERROR;
1044 }
1045
1046 result = raw_pci_read(pci_id->segment, pci_id->bus,
1047 PCI_DEVFN(pci_id->device, pci_id->function),
1048 reg, size, &value32);
1049 *value = value32;
1050
1051 return (result ? AE_ERROR : AE_OK);
1052}
1053
1054acpi_status
1055acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1056 u64 value, u32 width)
1057{
1058 int result, size;
1059
1060 switch (width) {
1061 case 8:
1062 size = 1;
1063 break;
1064 case 16:
1065 size = 2;
1066 break;
1067 case 32:
1068 size = 4;
1069 break;
1070 default:
1071 return AE_ERROR;
1072 }
1073
1074 result = raw_pci_write(pci_id->segment, pci_id->bus,
1075 PCI_DEVFN(pci_id->device, pci_id->function),
1076 reg, size, value);
1077
1078 return (result ? AE_ERROR : AE_OK);
1079}
1080
1081static void acpi_os_execute_deferred(struct work_struct *work)
1082{
1083 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1084
1085 dpc->function(dpc->context);
1086 kfree(dpc);
1087}
1088
1089/*******************************************************************************
1090 *
1091 * FUNCTION: acpi_os_execute
1092 *
1093 * PARAMETERS: Type - Type of the callback
1094 * Function - Function to be executed
1095 * Context - Function parameters
1096 *
1097 * RETURN: Status
1098 *
1099 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1100 * immediately executes function on a separate thread.
1101 *
1102 ******************************************************************************/
1103
1104acpi_status acpi_os_execute(acpi_execute_type type,
1105 acpi_osd_exec_callback function, void *context)
1106{
1107 acpi_status status = AE_OK;
1108 struct acpi_os_dpc *dpc;
1109 struct workqueue_struct *queue;
1110 int ret;
1111 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1112 "Scheduling function [%p(%p)] for deferred execution.\n",
1113 function, context));
1114
1115 /*
1116 * Allocate/initialize DPC structure. Note that this memory will be
1117 * freed by the callee. The kernel handles the work_struct list in a
1118 * way that allows us to also free its memory inside the callee.
1119 * Because we may want to schedule several tasks with different
1120 * parameters we can't use the approach some kernel code uses of
1121 * having a static work_struct.
1122 */
1123
1124 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1125 if (!dpc)
1126 return AE_NO_MEMORY;
1127
1128 dpc->function = function;
1129 dpc->context = context;
1130
1131 /*
1132 * To prevent lockdep from complaining unnecessarily, make sure that
1133 * there is a different static lockdep key for each workqueue by using
1134 * INIT_WORK() for each of them separately.
1135 */
1136 if (type == OSL_NOTIFY_HANDLER) {
1137 queue = kacpi_notify_wq;
1138 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1139 } else {
1140 queue = kacpid_wq;
1141 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1142 }
1143
1144 /*
1145 * On some machines, a software-initiated SMI causes corruption unless
1146 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1147 * typically it's done in GPE-related methods that are run via
1148 * workqueues, so we can avoid the known corruption cases by always
1149 * queueing on CPU 0.
1150 */
1151 ret = queue_work_on(0, queue, &dpc->work);
1152
1153 if (!ret) {
1154 printk(KERN_ERR PREFIX
1155 "Call to queue_work() failed.\n");
1156 status = AE_ERROR;
1157 kfree(dpc);
1158 }
1159 return status;
1160}
1161EXPORT_SYMBOL(acpi_os_execute);
1162
1163void acpi_os_wait_events_complete(void)
1164{
1165 flush_workqueue(kacpid_wq);
1166 flush_workqueue(kacpi_notify_wq);
1167}
1168
1169struct acpi_hp_work {
1170 struct work_struct work;
1171 struct acpi_device *adev;
1172 u32 src;
1173};
1174
1175static void acpi_hotplug_work_fn(struct work_struct *work)
1176{
1177 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1178
1179 acpi_os_wait_events_complete();
1180 acpi_device_hotplug(hpw->adev, hpw->src);
1181 kfree(hpw);
1182}
1183
1184acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1185{
1186 struct acpi_hp_work *hpw;
1187
1188 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1189 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1190 adev, src));
1191
1192 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1193 if (!hpw)
1194 return AE_NO_MEMORY;
1195
1196 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1197 hpw->adev = adev;
1198 hpw->src = src;
1199 /*
1200 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1201 * the hotplug code may call driver .remove() functions, which may
1202 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1203 * these workqueues.
1204 */
1205 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1206 kfree(hpw);
1207 return AE_ERROR;
1208 }
1209 return AE_OK;
1210}
1211
1212bool acpi_queue_hotplug_work(struct work_struct *work)
1213{
1214 return queue_work(kacpi_hotplug_wq, work);
1215}
1216
1217acpi_status
1218acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1219{
1220 struct semaphore *sem = NULL;
1221
1222 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1223 if (!sem)
1224 return AE_NO_MEMORY;
1225
1226 sema_init(sem, initial_units);
1227
1228 *handle = (acpi_handle *) sem;
1229
1230 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1231 *handle, initial_units));
1232
1233 return AE_OK;
1234}
1235
1236/*
1237 * TODO: A better way to delete semaphores? Linux doesn't have a
1238 * 'delete_semaphore()' function -- may result in an invalid
1239 * pointer dereference for non-synchronized consumers. Should
1240 * we at least check for blocked threads and signal/cancel them?
1241 */
1242
1243acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1244{
1245 struct semaphore *sem = (struct semaphore *)handle;
1246
1247 if (!sem)
1248 return AE_BAD_PARAMETER;
1249
1250 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1251
1252 BUG_ON(!list_empty(&sem->wait_list));
1253 kfree(sem);
1254 sem = NULL;
1255
1256 return AE_OK;
1257}
1258
1259/*
1260 * TODO: Support for units > 1?
1261 */
1262acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1263{
1264 acpi_status status = AE_OK;
1265 struct semaphore *sem = (struct semaphore *)handle;
1266 long jiffies;
1267 int ret = 0;
1268
1269 if (!sem || (units < 1))
1270 return AE_BAD_PARAMETER;
1271
1272 if (units > 1)
1273 return AE_SUPPORT;
1274
1275 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1276 handle, units, timeout));
1277
1278 if (timeout == ACPI_WAIT_FOREVER)
1279 jiffies = MAX_SCHEDULE_TIMEOUT;
1280 else
1281 jiffies = msecs_to_jiffies(timeout);
1282
1283 ret = down_timeout(sem, jiffies);
1284 if (ret)
1285 status = AE_TIME;
1286
1287 if (ACPI_FAILURE(status)) {
1288 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1289 "Failed to acquire semaphore[%p|%d|%d], %s",
1290 handle, units, timeout,
1291 acpi_format_exception(status)));
1292 } else {
1293 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1294 "Acquired semaphore[%p|%d|%d]", handle,
1295 units, timeout));
1296 }
1297
1298 return status;
1299}
1300
1301/*
1302 * TODO: Support for units > 1?
1303 */
1304acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1305{
1306 struct semaphore *sem = (struct semaphore *)handle;
1307
1308 if (!sem || (units < 1))
1309 return AE_BAD_PARAMETER;
1310
1311 if (units > 1)
1312 return AE_SUPPORT;
1313
1314 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1315 units));
1316
1317 up(sem);
1318
1319 return AE_OK;
1320}
1321
1322#ifdef ACPI_FUTURE_USAGE
1323u32 acpi_os_get_line(char *buffer)
1324{
1325
1326#ifdef ENABLE_DEBUGGER
1327 if (acpi_in_debugger) {
1328 u32 chars;
1329
1330 kdb_read(buffer, sizeof(line_buf));
1331
1332 /* remove the CR kdb includes */
1333 chars = strlen(buffer) - 1;
1334 buffer[chars] = '\0';
1335 }
1336#endif
1337
1338 return 0;
1339}
1340#endif /* ACPI_FUTURE_USAGE */
1341
1342acpi_status acpi_os_signal(u32 function, void *info)
1343{
1344 switch (function) {
1345 case ACPI_SIGNAL_FATAL:
1346 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1347 break;
1348 case ACPI_SIGNAL_BREAKPOINT:
1349 /*
1350 * AML Breakpoint
1351 * ACPI spec. says to treat it as a NOP unless
1352 * you are debugging. So if/when we integrate
1353 * AML debugger into the kernel debugger its
1354 * hook will go here. But until then it is
1355 * not useful to print anything on breakpoints.
1356 */
1357 break;
1358 default:
1359 break;
1360 }
1361
1362 return AE_OK;
1363}
1364
1365static int __init acpi_os_name_setup(char *str)
1366{
1367 char *p = acpi_os_name;
1368 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1369
1370 if (!str || !*str)
1371 return 0;
1372
1373 for (; count-- && *str; str++) {
1374 if (isalnum(*str) || *str == ' ' || *str == ':')
1375 *p++ = *str;
1376 else if (*str == '\'' || *str == '"')
1377 continue;
1378 else
1379 break;
1380 }
1381 *p = 0;
1382
1383 return 1;
1384
1385}
1386
1387__setup("acpi_os_name=", acpi_os_name_setup);
1388
1389#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1390#define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1391
1392struct osi_setup_entry {
1393 char string[OSI_STRING_LENGTH_MAX];
1394 bool enable;
1395};
1396
1397static struct osi_setup_entry
1398 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1399 {"Module Device", true},
1400 {"Processor Device", true},
1401 {"3.0 _SCP Extensions", true},
1402 {"Processor Aggregator Device", true},
1403};
1404
1405void __init acpi_osi_setup(char *str)
1406{
1407 struct osi_setup_entry *osi;
1408 bool enable = true;
1409 int i;
1410
1411 if (!acpi_gbl_create_osi_method)
1412 return;
1413
1414 if (str == NULL || *str == '\0') {
1415 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1416 acpi_gbl_create_osi_method = FALSE;
1417 return;
1418 }
1419
1420 if (*str == '!') {
1421 str++;
1422 if (*str == '\0') {
1423 osi_linux.default_disabling = 1;
1424 return;
1425 } else if (*str == '*') {
1426 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1427 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1428 osi = &osi_setup_entries[i];
1429 osi->enable = false;
1430 }
1431 return;
1432 }
1433 enable = false;
1434 }
1435
1436 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1437 osi = &osi_setup_entries[i];
1438 if (!strcmp(osi->string, str)) {
1439 osi->enable = enable;
1440 break;
1441 } else if (osi->string[0] == '\0') {
1442 osi->enable = enable;
1443 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1444 break;
1445 }
1446 }
1447}
1448
1449static void __init set_osi_linux(unsigned int enable)
1450{
1451 if (osi_linux.enable != enable)
1452 osi_linux.enable = enable;
1453
1454 if (osi_linux.enable)
1455 acpi_osi_setup("Linux");
1456 else
1457 acpi_osi_setup("!Linux");
1458
1459 return;
1460}
1461
1462static void __init acpi_cmdline_osi_linux(unsigned int enable)
1463{
1464 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1465 osi_linux.dmi = 0;
1466 set_osi_linux(enable);
1467
1468 return;
1469}
1470
1471void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1472{
1473 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1474
1475 if (enable == -1)
1476 return;
1477
1478 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1479 set_osi_linux(enable);
1480
1481 return;
1482}
1483
1484/*
1485 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1486 *
1487 * empty string disables _OSI
1488 * string starting with '!' disables that string
1489 * otherwise string is added to list, augmenting built-in strings
1490 */
1491static void __init acpi_osi_setup_late(void)
1492{
1493 struct osi_setup_entry *osi;
1494 char *str;
1495 int i;
1496 acpi_status status;
1497
1498 if (osi_linux.default_disabling) {
1499 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1500
1501 if (ACPI_SUCCESS(status))
1502 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1503 }
1504
1505 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1506 osi = &osi_setup_entries[i];
1507 str = osi->string;
1508
1509 if (*str == '\0')
1510 break;
1511 if (osi->enable) {
1512 status = acpi_install_interface(str);
1513
1514 if (ACPI_SUCCESS(status))
1515 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1516 } else {
1517 status = acpi_remove_interface(str);
1518
1519 if (ACPI_SUCCESS(status))
1520 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1521 }
1522 }
1523}
1524
1525static int __init osi_setup(char *str)
1526{
1527 if (str && !strcmp("Linux", str))
1528 acpi_cmdline_osi_linux(1);
1529 else if (str && !strcmp("!Linux", str))
1530 acpi_cmdline_osi_linux(0);
1531 else
1532 acpi_osi_setup(str);
1533
1534 return 1;
1535}
1536
1537__setup("acpi_osi=", osi_setup);
1538
1539/*
1540 * Disable the auto-serialization of named objects creation methods.
1541 *
1542 * This feature is enabled by default. It marks the AML control methods
1543 * that contain the opcodes to create named objects as "Serialized".
1544 */
1545static int __init acpi_no_auto_serialize_setup(char *str)
1546{
1547 acpi_gbl_auto_serialize_methods = FALSE;
1548 pr_info("ACPI: auto-serialization disabled\n");
1549
1550 return 1;
1551}
1552
1553__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1554
1555/* Check of resource interference between native drivers and ACPI
1556 * OperationRegions (SystemIO and System Memory only).
1557 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1558 * in arbitrary AML code and can interfere with legacy drivers.
1559 * acpi_enforce_resources= can be set to:
1560 *
1561 * - strict (default) (2)
1562 * -> further driver trying to access the resources will not load
1563 * - lax (1)
1564 * -> further driver trying to access the resources will load, but you
1565 * get a system message that something might go wrong...
1566 *
1567 * - no (0)
1568 * -> ACPI Operation Region resources will not be registered
1569 *
1570 */
1571#define ENFORCE_RESOURCES_STRICT 2
1572#define ENFORCE_RESOURCES_LAX 1
1573#define ENFORCE_RESOURCES_NO 0
1574
1575static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1576
1577static int __init acpi_enforce_resources_setup(char *str)
1578{
1579 if (str == NULL || *str == '\0')
1580 return 0;
1581
1582 if (!strcmp("strict", str))
1583 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1584 else if (!strcmp("lax", str))
1585 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1586 else if (!strcmp("no", str))
1587 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1588
1589 return 1;
1590}
1591
1592__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1593
1594/* Check for resource conflicts between ACPI OperationRegions and native
1595 * drivers */
1596int acpi_check_resource_conflict(const struct resource *res)
1597{
1598 acpi_adr_space_type space_id;
1599 acpi_size length;
1600 u8 warn = 0;
1601 int clash = 0;
1602
1603 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1604 return 0;
1605 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1606 return 0;
1607
1608 if (res->flags & IORESOURCE_IO)
1609 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1610 else
1611 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1612
1613 length = resource_size(res);
1614 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1615 warn = 1;
1616 clash = acpi_check_address_range(space_id, res->start, length, warn);
1617
1618 if (clash) {
1619 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1620 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1621 printk(KERN_NOTICE "ACPI: This conflict may"
1622 " cause random problems and system"
1623 " instability\n");
1624 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1625 " for this device, you should use it instead of"
1626 " the native driver\n");
1627 }
1628 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1629 return -EBUSY;
1630 }
1631 return 0;
1632}
1633EXPORT_SYMBOL(acpi_check_resource_conflict);
1634
1635int acpi_check_region(resource_size_t start, resource_size_t n,
1636 const char *name)
1637{
1638 struct resource res = {
1639 .start = start,
1640 .end = start + n - 1,
1641 .name = name,
1642 .flags = IORESOURCE_IO,
1643 };
1644
1645 return acpi_check_resource_conflict(&res);
1646}
1647EXPORT_SYMBOL(acpi_check_region);
1648
1649/*
1650 * Let drivers know whether the resource checks are effective
1651 */
1652int acpi_resources_are_enforced(void)
1653{
1654 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1655}
1656EXPORT_SYMBOL(acpi_resources_are_enforced);
1657
1658/*
1659 * Deallocate the memory for a spinlock.
1660 */
1661void acpi_os_delete_lock(acpi_spinlock handle)
1662{
1663 ACPI_FREE(handle);
1664}
1665
1666/*
1667 * Acquire a spinlock.
1668 *
1669 * handle is a pointer to the spinlock_t.
1670 */
1671
1672acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1673{
1674 acpi_cpu_flags flags;
1675 spin_lock_irqsave(lockp, flags);
1676 return flags;
1677}
1678
1679/*
1680 * Release a spinlock. See above.
1681 */
1682
1683void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1684{
1685 spin_unlock_irqrestore(lockp, flags);
1686}
1687
1688#ifndef ACPI_USE_LOCAL_CACHE
1689
1690/*******************************************************************************
1691 *
1692 * FUNCTION: acpi_os_create_cache
1693 *
1694 * PARAMETERS: name - Ascii name for the cache
1695 * size - Size of each cached object
1696 * depth - Maximum depth of the cache (in objects) <ignored>
1697 * cache - Where the new cache object is returned
1698 *
1699 * RETURN: status
1700 *
1701 * DESCRIPTION: Create a cache object
1702 *
1703 ******************************************************************************/
1704
1705acpi_status
1706acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1707{
1708 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1709 if (*cache == NULL)
1710 return AE_ERROR;
1711 else
1712 return AE_OK;
1713}
1714
1715/*******************************************************************************
1716 *
1717 * FUNCTION: acpi_os_purge_cache
1718 *
1719 * PARAMETERS: Cache - Handle to cache object
1720 *
1721 * RETURN: Status
1722 *
1723 * DESCRIPTION: Free all objects within the requested cache.
1724 *
1725 ******************************************************************************/
1726
1727acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1728{
1729 kmem_cache_shrink(cache);
1730 return (AE_OK);
1731}
1732
1733/*******************************************************************************
1734 *
1735 * FUNCTION: acpi_os_delete_cache
1736 *
1737 * PARAMETERS: Cache - Handle to cache object
1738 *
1739 * RETURN: Status
1740 *
1741 * DESCRIPTION: Free all objects within the requested cache and delete the
1742 * cache object.
1743 *
1744 ******************************************************************************/
1745
1746acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1747{
1748 kmem_cache_destroy(cache);
1749 return (AE_OK);
1750}
1751
1752/*******************************************************************************
1753 *
1754 * FUNCTION: acpi_os_release_object
1755 *
1756 * PARAMETERS: Cache - Handle to cache object
1757 * Object - The object to be released
1758 *
1759 * RETURN: None
1760 *
1761 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1762 * the object is deleted.
1763 *
1764 ******************************************************************************/
1765
1766acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1767{
1768 kmem_cache_free(cache, object);
1769 return (AE_OK);
1770}
1771#endif
1772
1773static int __init acpi_no_auto_ssdt_setup(char *s)
1774{
1775 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1776
1777 acpi_gbl_disable_ssdt_table_load = TRUE;
1778
1779 return 1;
1780}
1781
1782__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1783
1784static int __init acpi_disable_return_repair(char *s)
1785{
1786 printk(KERN_NOTICE PREFIX
1787 "ACPI: Predefined validation mechanism disabled\n");
1788 acpi_gbl_disable_auto_repair = TRUE;
1789
1790 return 1;
1791}
1792
1793__setup("acpica_no_return_repair", acpi_disable_return_repair);
1794
1795acpi_status __init acpi_os_initialize(void)
1796{
1797 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1798 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1799 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1800 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1801
1802 return AE_OK;
1803}
1804
1805acpi_status __init acpi_os_initialize1(void)
1806{
1807 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1808 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1809 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1810 BUG_ON(!kacpid_wq);
1811 BUG_ON(!kacpi_notify_wq);
1812 BUG_ON(!kacpi_hotplug_wq);
1813 acpi_install_interface_handler(acpi_osi_handler);
1814 acpi_osi_setup_late();
1815 return AE_OK;
1816}
1817
1818acpi_status acpi_os_terminate(void)
1819{
1820 if (acpi_irq_handler) {
1821 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1822 acpi_irq_handler);
1823 }
1824
1825 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1826 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1827 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1828 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1829
1830 destroy_workqueue(kacpid_wq);
1831 destroy_workqueue(kacpi_notify_wq);
1832 destroy_workqueue(kacpi_hotplug_wq);
1833
1834 return AE_OK;
1835}
1836
1837acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1838 u32 pm1b_control)
1839{
1840 int rc = 0;
1841 if (__acpi_os_prepare_sleep)
1842 rc = __acpi_os_prepare_sleep(sleep_state,
1843 pm1a_control, pm1b_control);
1844 if (rc < 0)
1845 return AE_ERROR;
1846 else if (rc > 0)
1847 return AE_CTRL_SKIP;
1848
1849 return AE_OK;
1850}
1851
1852void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1853 u32 pm1a_ctrl, u32 pm1b_ctrl))
1854{
1855 __acpi_os_prepare_sleep = func;
1856}
1857
1858acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1859 u32 val_b)
1860{
1861 int rc = 0;
1862 if (__acpi_os_prepare_extended_sleep)
1863 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1864 val_a, val_b);
1865 if (rc < 0)
1866 return AE_ERROR;
1867 else if (rc > 0)
1868 return AE_CTRL_SKIP;
1869
1870 return AE_OK;
1871}
1872
1873void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1874 u32 val_a, u32 val_b))
1875{
1876 __acpi_os_prepare_extended_sleep = func;
1877}