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