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
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX "ACPI: "
58 struct 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 */
73 int acpi_in_debugger;
74 EXPORT_SYMBOL(acpi_in_debugger);
75
76 extern char line_buf[80];
77 #endif /*ENABLE_DEBUGGER */
78
79 static acpi_osd_handler acpi_irq_handler;
80 static void *acpi_irq_context;
81 static struct workqueue_struct *kacpid_wq;
82 static struct workqueue_struct *kacpi_notify_wq;
83 static struct workqueue_struct *kacpi_hotplug_wq;
84
85 struct 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
95 static LIST_HEAD(resource_list_head);
96 static 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 */
102 struct 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
110 static LIST_HEAD(acpi_ioremaps);
111 static DEFINE_MUTEX(acpi_ioremap_lock);
112
113 static 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
148 static 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
acpi_osi_handler(acpi_string interface,u32 supported)154 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
155 {
156 if (!strcmp("Linux", interface)) {
157
158 printk(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
acpi_request_region(struct acpi_generic_address * addr,unsigned int length,char * desc)168 static 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
acpi_reserve_resources(void)181 static 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 }
213 device_initcall(acpi_reserve_resources);
214
acpi_os_printf(const char * fmt,...)215 void 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
acpi_os_vprintf(const char * fmt,va_list args)223 void 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
acpi_os_get_root_pointer(void)240 acpi_physical_address __init acpi_os_get_root_pointer(void)
241 {
242 if (efi_enabled) {
243 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
244 return efi.acpi20;
245 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
246 return efi.acpi;
247 else {
248 printk(KERN_ERR PREFIX
249 "System description tables not found\n");
250 return 0;
251 }
252 } else {
253 acpi_physical_address pa = 0;
254
255 acpi_find_root_pointer(&pa);
256 return pa;
257 }
258 }
259
260 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
261 static struct acpi_ioremap *
acpi_map_lookup(acpi_physical_address phys,acpi_size size)262 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
263 {
264 struct acpi_ioremap *map;
265
266 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
267 if (map->phys <= phys &&
268 phys + size <= map->phys + map->size)
269 return map;
270
271 return NULL;
272 }
273
274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
275 static void __iomem *
acpi_map_vaddr_lookup(acpi_physical_address phys,unsigned int size)276 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
277 {
278 struct acpi_ioremap *map;
279
280 map = acpi_map_lookup(phys, size);
281 if (map)
282 return map->virt + (phys - map->phys);
283
284 return NULL;
285 }
286
acpi_os_get_iomem(acpi_physical_address phys,unsigned int size)287 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
288 {
289 struct acpi_ioremap *map;
290 void __iomem *virt = NULL;
291
292 mutex_lock(&acpi_ioremap_lock);
293 map = acpi_map_lookup(phys, size);
294 if (map) {
295 virt = map->virt + (phys - map->phys);
296 map->refcount++;
297 }
298 mutex_unlock(&acpi_ioremap_lock);
299 return virt;
300 }
301 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
302
303 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
304 static struct acpi_ioremap *
acpi_map_lookup_virt(void __iomem * virt,acpi_size size)305 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
306 {
307 struct acpi_ioremap *map;
308
309 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
310 if (map->virt <= virt &&
311 virt + size <= map->virt + map->size)
312 return map;
313
314 return NULL;
315 }
316
317 void __iomem *__init_refok
acpi_os_map_memory(acpi_physical_address phys,acpi_size size)318 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
319 {
320 struct acpi_ioremap *map;
321 void __iomem *virt;
322 acpi_physical_address pg_off;
323 acpi_size pg_sz;
324
325 if (phys > ULONG_MAX) {
326 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
327 return NULL;
328 }
329
330 if (!acpi_gbl_permanent_mmap)
331 return __acpi_map_table((unsigned long)phys, size);
332
333 mutex_lock(&acpi_ioremap_lock);
334 /* Check if there's a suitable mapping already. */
335 map = acpi_map_lookup(phys, size);
336 if (map) {
337 map->refcount++;
338 goto out;
339 }
340
341 map = kzalloc(sizeof(*map), GFP_KERNEL);
342 if (!map) {
343 mutex_unlock(&acpi_ioremap_lock);
344 return NULL;
345 }
346
347 pg_off = round_down(phys, PAGE_SIZE);
348 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
349 virt = acpi_os_ioremap(pg_off, pg_sz);
350 if (!virt) {
351 mutex_unlock(&acpi_ioremap_lock);
352 kfree(map);
353 return NULL;
354 }
355
356 INIT_LIST_HEAD(&map->list);
357 map->virt = virt;
358 map->phys = pg_off;
359 map->size = pg_sz;
360 map->refcount = 1;
361
362 list_add_tail_rcu(&map->list, &acpi_ioremaps);
363
364 out:
365 mutex_unlock(&acpi_ioremap_lock);
366 return map->virt + (phys - map->phys);
367 }
368 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
369
acpi_os_drop_map_ref(struct acpi_ioremap * map)370 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
371 {
372 if (!--map->refcount)
373 list_del_rcu(&map->list);
374 }
375
acpi_os_map_cleanup(struct acpi_ioremap * map)376 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
377 {
378 if (!map->refcount) {
379 synchronize_rcu();
380 iounmap(map->virt);
381 kfree(map);
382 }
383 }
384
acpi_os_unmap_memory(void __iomem * virt,acpi_size size)385 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
386 {
387 struct acpi_ioremap *map;
388
389 if (!acpi_gbl_permanent_mmap) {
390 __acpi_unmap_table(virt, size);
391 return;
392 }
393
394 mutex_lock(&acpi_ioremap_lock);
395 map = acpi_map_lookup_virt(virt, size);
396 if (!map) {
397 mutex_unlock(&acpi_ioremap_lock);
398 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
399 return;
400 }
401 acpi_os_drop_map_ref(map);
402 mutex_unlock(&acpi_ioremap_lock);
403
404 acpi_os_map_cleanup(map);
405 }
406 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
407
early_acpi_os_unmap_memory(void __iomem * virt,acpi_size size)408 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
409 {
410 if (!acpi_gbl_permanent_mmap)
411 __acpi_unmap_table(virt, size);
412 }
413
acpi_os_map_generic_address(struct acpi_generic_address * addr)414 static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
415 {
416 void __iomem *virt;
417
418 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
419 return 0;
420
421 if (!addr->address || !addr->bit_width)
422 return -EINVAL;
423
424 virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
425 if (!virt)
426 return -EIO;
427
428 return 0;
429 }
430
acpi_os_unmap_generic_address(struct acpi_generic_address * addr)431 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
432 {
433 struct acpi_ioremap *map;
434
435 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
436 return;
437
438 if (!addr->address || !addr->bit_width)
439 return;
440
441 mutex_lock(&acpi_ioremap_lock);
442 map = acpi_map_lookup(addr->address, addr->bit_width / 8);
443 if (!map) {
444 mutex_unlock(&acpi_ioremap_lock);
445 return;
446 }
447 acpi_os_drop_map_ref(map);
448 mutex_unlock(&acpi_ioremap_lock);
449
450 acpi_os_map_cleanup(map);
451 }
452
453 #ifdef ACPI_FUTURE_USAGE
454 acpi_status
acpi_os_get_physical_address(void * virt,acpi_physical_address * phys)455 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
456 {
457 if (!phys || !virt)
458 return AE_BAD_PARAMETER;
459
460 *phys = virt_to_phys(virt);
461
462 return AE_OK;
463 }
464 #endif
465
466 #define ACPI_MAX_OVERRIDE_LEN 100
467
468 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
469
470 acpi_status
acpi_os_predefined_override(const struct acpi_predefined_names * init_val,acpi_string * new_val)471 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
472 acpi_string * new_val)
473 {
474 if (!init_val || !new_val)
475 return AE_BAD_PARAMETER;
476
477 *new_val = NULL;
478 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
479 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
480 acpi_os_name);
481 *new_val = acpi_os_name;
482 }
483
484 return AE_OK;
485 }
486
487 acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)488 acpi_os_table_override(struct acpi_table_header * existing_table,
489 struct acpi_table_header ** new_table)
490 {
491 if (!existing_table || !new_table)
492 return AE_BAD_PARAMETER;
493
494 *new_table = NULL;
495
496 #ifdef CONFIG_ACPI_CUSTOM_DSDT
497 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
498 *new_table = (struct acpi_table_header *)AmlCode;
499 #endif
500 if (*new_table != NULL) {
501 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
502 "this is unsafe: tainting kernel\n",
503 existing_table->signature,
504 existing_table->oem_table_id);
505 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
506 }
507 return AE_OK;
508 }
509
acpi_irq(int irq,void * dev_id)510 static irqreturn_t acpi_irq(int irq, void *dev_id)
511 {
512 u32 handled;
513
514 handled = (*acpi_irq_handler) (acpi_irq_context);
515
516 if (handled) {
517 acpi_irq_handled++;
518 return IRQ_HANDLED;
519 } else {
520 acpi_irq_not_handled++;
521 return IRQ_NONE;
522 }
523 }
524
525 acpi_status
acpi_os_install_interrupt_handler(u32 gsi,acpi_osd_handler handler,void * context)526 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
527 void *context)
528 {
529 unsigned int irq;
530
531 acpi_irq_stats_init();
532
533 /*
534 * ACPI interrupts different from the SCI in our copy of the FADT are
535 * not supported.
536 */
537 if (gsi != acpi_gbl_FADT.sci_interrupt)
538 return AE_BAD_PARAMETER;
539
540 if (acpi_irq_handler)
541 return AE_ALREADY_ACQUIRED;
542
543 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
544 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
545 gsi);
546 return AE_OK;
547 }
548
549 acpi_irq_handler = handler;
550 acpi_irq_context = context;
551 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
552 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
553 acpi_irq_handler = NULL;
554 return AE_NOT_ACQUIRED;
555 }
556
557 return AE_OK;
558 }
559
acpi_os_remove_interrupt_handler(u32 irq,acpi_osd_handler handler)560 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
561 {
562 if (irq != acpi_gbl_FADT.sci_interrupt)
563 return AE_BAD_PARAMETER;
564
565 free_irq(irq, acpi_irq);
566 acpi_irq_handler = NULL;
567
568 return AE_OK;
569 }
570
571 /*
572 * Running in interpreter thread context, safe to sleep
573 */
574
acpi_os_sleep(u64 ms)575 void acpi_os_sleep(u64 ms)
576 {
577 schedule_timeout_interruptible(msecs_to_jiffies(ms));
578 }
579
acpi_os_stall(u32 us)580 void acpi_os_stall(u32 us)
581 {
582 while (us) {
583 u32 delay = 1000;
584
585 if (delay > us)
586 delay = us;
587 udelay(delay);
588 touch_nmi_watchdog();
589 us -= delay;
590 }
591 }
592
593 /*
594 * Support ACPI 3.0 AML Timer operand
595 * Returns 64-bit free-running, monotonically increasing timer
596 * with 100ns granularity
597 */
acpi_os_get_timer(void)598 u64 acpi_os_get_timer(void)
599 {
600 static u64 t;
601
602 #ifdef CONFIG_HPET
603 /* TBD: use HPET if available */
604 #endif
605
606 #ifdef CONFIG_X86_PM_TIMER
607 /* TBD: default to PM timer if HPET was not available */
608 #endif
609 if (!t)
610 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
611
612 return ++t;
613 }
614
acpi_os_read_port(acpi_io_address port,u32 * value,u32 width)615 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
616 {
617 u32 dummy;
618
619 if (!value)
620 value = &dummy;
621
622 *value = 0;
623 if (width <= 8) {
624 *(u8 *) value = inb(port);
625 } else if (width <= 16) {
626 *(u16 *) value = inw(port);
627 } else if (width <= 32) {
628 *(u32 *) value = inl(port);
629 } else {
630 BUG();
631 }
632
633 return AE_OK;
634 }
635
636 EXPORT_SYMBOL(acpi_os_read_port);
637
acpi_os_write_port(acpi_io_address port,u32 value,u32 width)638 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
639 {
640 if (width <= 8) {
641 outb(value, port);
642 } else if (width <= 16) {
643 outw(value, port);
644 } else if (width <= 32) {
645 outl(value, port);
646 } else {
647 BUG();
648 }
649
650 return AE_OK;
651 }
652
653 EXPORT_SYMBOL(acpi_os_write_port);
654
655 acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr,u32 * value,u32 width)656 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
657 {
658 void __iomem *virt_addr;
659 unsigned int size = width / 8;
660 bool unmap = false;
661 u32 dummy;
662
663 rcu_read_lock();
664 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
665 if (!virt_addr) {
666 rcu_read_unlock();
667 virt_addr = acpi_os_ioremap(phys_addr, size);
668 if (!virt_addr)
669 return AE_BAD_ADDRESS;
670 unmap = true;
671 }
672
673 if (!value)
674 value = &dummy;
675
676 switch (width) {
677 case 8:
678 *(u8 *) value = readb(virt_addr);
679 break;
680 case 16:
681 *(u16 *) value = readw(virt_addr);
682 break;
683 case 32:
684 *(u32 *) value = readl(virt_addr);
685 break;
686 default:
687 BUG();
688 }
689
690 if (unmap)
691 iounmap(virt_addr);
692 else
693 rcu_read_unlock();
694
695 return AE_OK;
696 }
697
698 acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr,u32 value,u32 width)699 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
700 {
701 void __iomem *virt_addr;
702 unsigned int size = width / 8;
703 bool unmap = false;
704
705 rcu_read_lock();
706 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
707 if (!virt_addr) {
708 rcu_read_unlock();
709 virt_addr = acpi_os_ioremap(phys_addr, size);
710 if (!virt_addr)
711 return AE_BAD_ADDRESS;
712 unmap = true;
713 }
714
715 switch (width) {
716 case 8:
717 writeb(value, virt_addr);
718 break;
719 case 16:
720 writew(value, virt_addr);
721 break;
722 case 32:
723 writel(value, virt_addr);
724 break;
725 default:
726 BUG();
727 }
728
729 if (unmap)
730 iounmap(virt_addr);
731 else
732 rcu_read_unlock();
733
734 return AE_OK;
735 }
736
737 acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id,u32 reg,u64 * value,u32 width)738 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
739 u64 *value, u32 width)
740 {
741 int result, size;
742 u32 value32;
743
744 if (!value)
745 return AE_BAD_PARAMETER;
746
747 switch (width) {
748 case 8:
749 size = 1;
750 break;
751 case 16:
752 size = 2;
753 break;
754 case 32:
755 size = 4;
756 break;
757 default:
758 return AE_ERROR;
759 }
760
761 result = raw_pci_read(pci_id->segment, pci_id->bus,
762 PCI_DEVFN(pci_id->device, pci_id->function),
763 reg, size, &value32);
764 *value = value32;
765
766 return (result ? AE_ERROR : AE_OK);
767 }
768
769 acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id,u32 reg,u64 value,u32 width)770 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
771 u64 value, u32 width)
772 {
773 int result, size;
774
775 switch (width) {
776 case 8:
777 size = 1;
778 break;
779 case 16:
780 size = 2;
781 break;
782 case 32:
783 size = 4;
784 break;
785 default:
786 return AE_ERROR;
787 }
788
789 result = raw_pci_write(pci_id->segment, pci_id->bus,
790 PCI_DEVFN(pci_id->device, pci_id->function),
791 reg, size, value);
792
793 return (result ? AE_ERROR : AE_OK);
794 }
795
acpi_os_execute_deferred(struct work_struct * work)796 static void acpi_os_execute_deferred(struct work_struct *work)
797 {
798 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
799
800 if (dpc->wait)
801 acpi_os_wait_events_complete(NULL);
802
803 dpc->function(dpc->context);
804 kfree(dpc);
805 }
806
807 /*******************************************************************************
808 *
809 * FUNCTION: acpi_os_execute
810 *
811 * PARAMETERS: Type - Type of the callback
812 * Function - Function to be executed
813 * Context - Function parameters
814 *
815 * RETURN: Status
816 *
817 * DESCRIPTION: Depending on type, either queues function for deferred execution or
818 * immediately executes function on a separate thread.
819 *
820 ******************************************************************************/
821
__acpi_os_execute(acpi_execute_type type,acpi_osd_exec_callback function,void * context,int hp)822 static acpi_status __acpi_os_execute(acpi_execute_type type,
823 acpi_osd_exec_callback function, void *context, int hp)
824 {
825 acpi_status status = AE_OK;
826 struct acpi_os_dpc *dpc;
827 struct workqueue_struct *queue;
828 int ret;
829 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
830 "Scheduling function [%p(%p)] for deferred execution.\n",
831 function, context));
832
833 /*
834 * Allocate/initialize DPC structure. Note that this memory will be
835 * freed by the callee. The kernel handles the work_struct list in a
836 * way that allows us to also free its memory inside the callee.
837 * Because we may want to schedule several tasks with different
838 * parameters we can't use the approach some kernel code uses of
839 * having a static work_struct.
840 */
841
842 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
843 if (!dpc)
844 return AE_NO_MEMORY;
845
846 dpc->function = function;
847 dpc->context = context;
848
849 /*
850 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
851 * because the hotplug code may call driver .remove() functions,
852 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
853 * to flush these workqueues.
854 */
855 queue = hp ? kacpi_hotplug_wq :
856 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
857 dpc->wait = hp ? 1 : 0;
858
859 if (queue == kacpi_hotplug_wq)
860 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
861 else if (queue == kacpi_notify_wq)
862 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
863 else
864 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
865
866 /*
867 * On some machines, a software-initiated SMI causes corruption unless
868 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
869 * typically it's done in GPE-related methods that are run via
870 * workqueues, so we can avoid the known corruption cases by always
871 * queueing on CPU 0.
872 */
873 ret = queue_work_on(0, queue, &dpc->work);
874
875 if (!ret) {
876 printk(KERN_ERR PREFIX
877 "Call to queue_work() failed.\n");
878 status = AE_ERROR;
879 kfree(dpc);
880 }
881 return status;
882 }
883
acpi_os_execute(acpi_execute_type type,acpi_osd_exec_callback function,void * context)884 acpi_status acpi_os_execute(acpi_execute_type type,
885 acpi_osd_exec_callback function, void *context)
886 {
887 return __acpi_os_execute(type, function, context, 0);
888 }
889 EXPORT_SYMBOL(acpi_os_execute);
890
acpi_os_hotplug_execute(acpi_osd_exec_callback function,void * context)891 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
892 void *context)
893 {
894 return __acpi_os_execute(0, function, context, 1);
895 }
896
acpi_os_wait_events_complete(void * context)897 void acpi_os_wait_events_complete(void *context)
898 {
899 flush_workqueue(kacpid_wq);
900 flush_workqueue(kacpi_notify_wq);
901 }
902
903 EXPORT_SYMBOL(acpi_os_wait_events_complete);
904
905 /*
906 * Deallocate the memory for a spinlock.
907 */
acpi_os_delete_lock(acpi_spinlock handle)908 void acpi_os_delete_lock(acpi_spinlock handle)
909 {
910 return;
911 }
912
913 acpi_status
acpi_os_create_semaphore(u32 max_units,u32 initial_units,acpi_handle * handle)914 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
915 {
916 struct semaphore *sem = NULL;
917
918 sem = acpi_os_allocate(sizeof(struct semaphore));
919 if (!sem)
920 return AE_NO_MEMORY;
921 memset(sem, 0, sizeof(struct semaphore));
922
923 sema_init(sem, initial_units);
924
925 *handle = (acpi_handle *) sem;
926
927 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
928 *handle, initial_units));
929
930 return AE_OK;
931 }
932
933 /*
934 * TODO: A better way to delete semaphores? Linux doesn't have a
935 * 'delete_semaphore()' function -- may result in an invalid
936 * pointer dereference for non-synchronized consumers. Should
937 * we at least check for blocked threads and signal/cancel them?
938 */
939
acpi_os_delete_semaphore(acpi_handle handle)940 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
941 {
942 struct semaphore *sem = (struct semaphore *)handle;
943
944 if (!sem)
945 return AE_BAD_PARAMETER;
946
947 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
948
949 BUG_ON(!list_empty(&sem->wait_list));
950 kfree(sem);
951 sem = NULL;
952
953 return AE_OK;
954 }
955
956 /*
957 * TODO: Support for units > 1?
958 */
acpi_os_wait_semaphore(acpi_handle handle,u32 units,u16 timeout)959 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
960 {
961 acpi_status status = AE_OK;
962 struct semaphore *sem = (struct semaphore *)handle;
963 long jiffies;
964 int ret = 0;
965
966 if (!sem || (units < 1))
967 return AE_BAD_PARAMETER;
968
969 if (units > 1)
970 return AE_SUPPORT;
971
972 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
973 handle, units, timeout));
974
975 if (timeout == ACPI_WAIT_FOREVER)
976 jiffies = MAX_SCHEDULE_TIMEOUT;
977 else
978 jiffies = msecs_to_jiffies(timeout);
979
980 ret = down_timeout(sem, jiffies);
981 if (ret)
982 status = AE_TIME;
983
984 if (ACPI_FAILURE(status)) {
985 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
986 "Failed to acquire semaphore[%p|%d|%d], %s",
987 handle, units, timeout,
988 acpi_format_exception(status)));
989 } else {
990 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
991 "Acquired semaphore[%p|%d|%d]", handle,
992 units, timeout));
993 }
994
995 return status;
996 }
997
998 /*
999 * TODO: Support for units > 1?
1000 */
acpi_os_signal_semaphore(acpi_handle handle,u32 units)1001 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1002 {
1003 struct semaphore *sem = (struct semaphore *)handle;
1004
1005 if (!sem || (units < 1))
1006 return AE_BAD_PARAMETER;
1007
1008 if (units > 1)
1009 return AE_SUPPORT;
1010
1011 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1012 units));
1013
1014 up(sem);
1015
1016 return AE_OK;
1017 }
1018
1019 #ifdef ACPI_FUTURE_USAGE
acpi_os_get_line(char * buffer)1020 u32 acpi_os_get_line(char *buffer)
1021 {
1022
1023 #ifdef ENABLE_DEBUGGER
1024 if (acpi_in_debugger) {
1025 u32 chars;
1026
1027 kdb_read(buffer, sizeof(line_buf));
1028
1029 /* remove the CR kdb includes */
1030 chars = strlen(buffer) - 1;
1031 buffer[chars] = '\0';
1032 }
1033 #endif
1034
1035 return 0;
1036 }
1037 #endif /* ACPI_FUTURE_USAGE */
1038
acpi_os_signal(u32 function,void * info)1039 acpi_status acpi_os_signal(u32 function, void *info)
1040 {
1041 switch (function) {
1042 case ACPI_SIGNAL_FATAL:
1043 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1044 break;
1045 case ACPI_SIGNAL_BREAKPOINT:
1046 /*
1047 * AML Breakpoint
1048 * ACPI spec. says to treat it as a NOP unless
1049 * you are debugging. So if/when we integrate
1050 * AML debugger into the kernel debugger its
1051 * hook will go here. But until then it is
1052 * not useful to print anything on breakpoints.
1053 */
1054 break;
1055 default:
1056 break;
1057 }
1058
1059 return AE_OK;
1060 }
1061
acpi_os_name_setup(char * str)1062 static int __init acpi_os_name_setup(char *str)
1063 {
1064 char *p = acpi_os_name;
1065 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1066
1067 if (!str || !*str)
1068 return 0;
1069
1070 for (; count-- && str && *str; str++) {
1071 if (isalnum(*str) || *str == ' ' || *str == ':')
1072 *p++ = *str;
1073 else if (*str == '\'' || *str == '"')
1074 continue;
1075 else
1076 break;
1077 }
1078 *p = 0;
1079
1080 return 1;
1081
1082 }
1083
1084 __setup("acpi_os_name=", acpi_os_name_setup);
1085
1086 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1087 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1088
1089 struct osi_setup_entry {
1090 char string[OSI_STRING_LENGTH_MAX];
1091 bool enable;
1092 };
1093
1094 static struct osi_setup_entry __initdata osi_setup_entries[OSI_STRING_ENTRIES_MAX];
1095
acpi_osi_setup(char * str)1096 void __init acpi_osi_setup(char *str)
1097 {
1098 struct osi_setup_entry *osi;
1099 bool enable = true;
1100 int i;
1101
1102 if (!acpi_gbl_create_osi_method)
1103 return;
1104
1105 if (str == NULL || *str == '\0') {
1106 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1107 acpi_gbl_create_osi_method = FALSE;
1108 return;
1109 }
1110
1111 if (*str == '!') {
1112 str++;
1113 enable = false;
1114 }
1115
1116 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1117 osi = &osi_setup_entries[i];
1118 if (!strcmp(osi->string, str)) {
1119 osi->enable = enable;
1120 break;
1121 } else if (osi->string[0] == '\0') {
1122 osi->enable = enable;
1123 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1124 break;
1125 }
1126 }
1127 }
1128
set_osi_linux(unsigned int enable)1129 static void __init set_osi_linux(unsigned int enable)
1130 {
1131 if (osi_linux.enable != enable)
1132 osi_linux.enable = enable;
1133
1134 if (osi_linux.enable)
1135 acpi_osi_setup("Linux");
1136 else
1137 acpi_osi_setup("!Linux");
1138
1139 return;
1140 }
1141
acpi_cmdline_osi_linux(unsigned int enable)1142 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1143 {
1144 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1145 osi_linux.dmi = 0;
1146 set_osi_linux(enable);
1147
1148 return;
1149 }
1150
acpi_dmi_osi_linux(int enable,const struct dmi_system_id * d)1151 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1152 {
1153 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1154
1155 if (enable == -1)
1156 return;
1157
1158 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1159 set_osi_linux(enable);
1160
1161 return;
1162 }
1163
1164 /*
1165 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1166 *
1167 * empty string disables _OSI
1168 * string starting with '!' disables that string
1169 * otherwise string is added to list, augmenting built-in strings
1170 */
acpi_osi_setup_late(void)1171 static void __init acpi_osi_setup_late(void)
1172 {
1173 struct osi_setup_entry *osi;
1174 char *str;
1175 int i;
1176 acpi_status status;
1177
1178 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1179 osi = &osi_setup_entries[i];
1180 str = osi->string;
1181
1182 if (*str == '\0')
1183 break;
1184 if (osi->enable) {
1185 status = acpi_install_interface(str);
1186
1187 if (ACPI_SUCCESS(status))
1188 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1189 } else {
1190 status = acpi_remove_interface(str);
1191
1192 if (ACPI_SUCCESS(status))
1193 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1194 }
1195 }
1196 }
1197
osi_setup(char * str)1198 static int __init osi_setup(char *str)
1199 {
1200 if (str && !strcmp("Linux", str))
1201 acpi_cmdline_osi_linux(1);
1202 else if (str && !strcmp("!Linux", str))
1203 acpi_cmdline_osi_linux(0);
1204 else
1205 acpi_osi_setup(str);
1206
1207 return 1;
1208 }
1209
1210 __setup("acpi_osi=", osi_setup);
1211
1212 /* enable serialization to combat AE_ALREADY_EXISTS errors */
acpi_serialize_setup(char * str)1213 static int __init acpi_serialize_setup(char *str)
1214 {
1215 printk(KERN_INFO PREFIX "serialize enabled\n");
1216
1217 acpi_gbl_all_methods_serialized = TRUE;
1218
1219 return 1;
1220 }
1221
1222 __setup("acpi_serialize", acpi_serialize_setup);
1223
1224 /* Check of resource interference between native drivers and ACPI
1225 * OperationRegions (SystemIO and System Memory only).
1226 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1227 * in arbitrary AML code and can interfere with legacy drivers.
1228 * acpi_enforce_resources= can be set to:
1229 *
1230 * - strict (default) (2)
1231 * -> further driver trying to access the resources will not load
1232 * - lax (1)
1233 * -> further driver trying to access the resources will load, but you
1234 * get a system message that something might go wrong...
1235 *
1236 * - no (0)
1237 * -> ACPI Operation Region resources will not be registered
1238 *
1239 */
1240 #define ENFORCE_RESOURCES_STRICT 2
1241 #define ENFORCE_RESOURCES_LAX 1
1242 #define ENFORCE_RESOURCES_NO 0
1243
1244 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1245
acpi_enforce_resources_setup(char * str)1246 static int __init acpi_enforce_resources_setup(char *str)
1247 {
1248 if (str == NULL || *str == '\0')
1249 return 0;
1250
1251 if (!strcmp("strict", str))
1252 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1253 else if (!strcmp("lax", str))
1254 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1255 else if (!strcmp("no", str))
1256 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1257
1258 return 1;
1259 }
1260
1261 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1262
1263 /* Check for resource conflicts between ACPI OperationRegions and native
1264 * drivers */
acpi_check_resource_conflict(const struct resource * res)1265 int acpi_check_resource_conflict(const struct resource *res)
1266 {
1267 struct acpi_res_list *res_list_elem;
1268 int ioport = 0, clash = 0;
1269
1270 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1271 return 0;
1272 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1273 return 0;
1274
1275 ioport = res->flags & IORESOURCE_IO;
1276
1277 spin_lock(&acpi_res_lock);
1278 list_for_each_entry(res_list_elem, &resource_list_head,
1279 resource_list) {
1280 if (ioport && (res_list_elem->resource_type
1281 != ACPI_ADR_SPACE_SYSTEM_IO))
1282 continue;
1283 if (!ioport && (res_list_elem->resource_type
1284 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1285 continue;
1286
1287 if (res->end < res_list_elem->start
1288 || res_list_elem->end < res->start)
1289 continue;
1290 clash = 1;
1291 break;
1292 }
1293 spin_unlock(&acpi_res_lock);
1294
1295 if (clash) {
1296 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1297 printk(KERN_WARNING "ACPI: resource %s %pR"
1298 " conflicts with ACPI region %s "
1299 "[%s 0x%zx-0x%zx]\n",
1300 res->name, res, res_list_elem->name,
1301 (res_list_elem->resource_type ==
1302 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1303 (size_t) res_list_elem->start,
1304 (size_t) res_list_elem->end);
1305 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1306 printk(KERN_NOTICE "ACPI: This conflict may"
1307 " cause random problems and system"
1308 " instability\n");
1309 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1310 " for this device, you should use it instead of"
1311 " the native driver\n");
1312 }
1313 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1314 return -EBUSY;
1315 }
1316 return 0;
1317 }
1318 EXPORT_SYMBOL(acpi_check_resource_conflict);
1319
acpi_check_region(resource_size_t start,resource_size_t n,const char * name)1320 int acpi_check_region(resource_size_t start, resource_size_t n,
1321 const char *name)
1322 {
1323 struct resource res = {
1324 .start = start,
1325 .end = start + n - 1,
1326 .name = name,
1327 .flags = IORESOURCE_IO,
1328 };
1329
1330 return acpi_check_resource_conflict(&res);
1331 }
1332 EXPORT_SYMBOL(acpi_check_region);
1333
1334 /*
1335 * Let drivers know whether the resource checks are effective
1336 */
acpi_resources_are_enforced(void)1337 int acpi_resources_are_enforced(void)
1338 {
1339 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1340 }
1341 EXPORT_SYMBOL(acpi_resources_are_enforced);
1342
1343 /*
1344 * Acquire a spinlock.
1345 *
1346 * handle is a pointer to the spinlock_t.
1347 */
1348
acpi_os_acquire_lock(acpi_spinlock lockp)1349 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1350 {
1351 acpi_cpu_flags flags;
1352 spin_lock_irqsave(lockp, flags);
1353 return flags;
1354 }
1355
1356 /*
1357 * Release a spinlock. See above.
1358 */
1359
acpi_os_release_lock(acpi_spinlock lockp,acpi_cpu_flags flags)1360 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1361 {
1362 spin_unlock_irqrestore(lockp, flags);
1363 }
1364
1365 #ifndef ACPI_USE_LOCAL_CACHE
1366
1367 /*******************************************************************************
1368 *
1369 * FUNCTION: acpi_os_create_cache
1370 *
1371 * PARAMETERS: name - Ascii name for the cache
1372 * size - Size of each cached object
1373 * depth - Maximum depth of the cache (in objects) <ignored>
1374 * cache - Where the new cache object is returned
1375 *
1376 * RETURN: status
1377 *
1378 * DESCRIPTION: Create a cache object
1379 *
1380 ******************************************************************************/
1381
1382 acpi_status
acpi_os_create_cache(char * name,u16 size,u16 depth,acpi_cache_t ** cache)1383 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1384 {
1385 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1386 if (*cache == NULL)
1387 return AE_ERROR;
1388 else
1389 return AE_OK;
1390 }
1391
1392 /*******************************************************************************
1393 *
1394 * FUNCTION: acpi_os_purge_cache
1395 *
1396 * PARAMETERS: Cache - Handle to cache object
1397 *
1398 * RETURN: Status
1399 *
1400 * DESCRIPTION: Free all objects within the requested cache.
1401 *
1402 ******************************************************************************/
1403
acpi_os_purge_cache(acpi_cache_t * cache)1404 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1405 {
1406 kmem_cache_shrink(cache);
1407 return (AE_OK);
1408 }
1409
1410 /*******************************************************************************
1411 *
1412 * FUNCTION: acpi_os_delete_cache
1413 *
1414 * PARAMETERS: Cache - Handle to cache object
1415 *
1416 * RETURN: Status
1417 *
1418 * DESCRIPTION: Free all objects within the requested cache and delete the
1419 * cache object.
1420 *
1421 ******************************************************************************/
1422
acpi_os_delete_cache(acpi_cache_t * cache)1423 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1424 {
1425 kmem_cache_destroy(cache);
1426 return (AE_OK);
1427 }
1428
1429 /*******************************************************************************
1430 *
1431 * FUNCTION: acpi_os_release_object
1432 *
1433 * PARAMETERS: Cache - Handle to cache object
1434 * Object - The object to be released
1435 *
1436 * RETURN: None
1437 *
1438 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1439 * the object is deleted.
1440 *
1441 ******************************************************************************/
1442
acpi_os_release_object(acpi_cache_t * cache,void * object)1443 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1444 {
1445 kmem_cache_free(cache, object);
1446 return (AE_OK);
1447 }
1448
acpi_res_list_add(struct acpi_res_list * res)1449 static inline int acpi_res_list_add(struct acpi_res_list *res)
1450 {
1451 struct acpi_res_list *res_list_elem;
1452
1453 list_for_each_entry(res_list_elem, &resource_list_head,
1454 resource_list) {
1455
1456 if (res->resource_type == res_list_elem->resource_type &&
1457 res->start == res_list_elem->start &&
1458 res->end == res_list_elem->end) {
1459
1460 /*
1461 * The Region(addr,len) already exist in the list,
1462 * just increase the count
1463 */
1464
1465 res_list_elem->count++;
1466 return 0;
1467 }
1468 }
1469
1470 res->count = 1;
1471 list_add(&res->resource_list, &resource_list_head);
1472 return 1;
1473 }
1474
acpi_res_list_del(struct acpi_res_list * res)1475 static inline void acpi_res_list_del(struct acpi_res_list *res)
1476 {
1477 struct acpi_res_list *res_list_elem;
1478
1479 list_for_each_entry(res_list_elem, &resource_list_head,
1480 resource_list) {
1481
1482 if (res->resource_type == res_list_elem->resource_type &&
1483 res->start == res_list_elem->start &&
1484 res->end == res_list_elem->end) {
1485
1486 /*
1487 * If the res count is decreased to 0,
1488 * remove and free it
1489 */
1490
1491 if (--res_list_elem->count == 0) {
1492 list_del(&res_list_elem->resource_list);
1493 kfree(res_list_elem);
1494 }
1495 return;
1496 }
1497 }
1498 }
1499
1500 acpi_status
acpi_os_invalidate_address(u8 space_id,acpi_physical_address address,acpi_size length)1501 acpi_os_invalidate_address(
1502 u8 space_id,
1503 acpi_physical_address address,
1504 acpi_size length)
1505 {
1506 struct acpi_res_list res;
1507
1508 switch (space_id) {
1509 case ACPI_ADR_SPACE_SYSTEM_IO:
1510 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1511 /* Only interference checks against SystemIO and SystemMemory
1512 are needed */
1513 res.start = address;
1514 res.end = address + length - 1;
1515 res.resource_type = space_id;
1516 spin_lock(&acpi_res_lock);
1517 acpi_res_list_del(&res);
1518 spin_unlock(&acpi_res_lock);
1519 break;
1520 case ACPI_ADR_SPACE_PCI_CONFIG:
1521 case ACPI_ADR_SPACE_EC:
1522 case ACPI_ADR_SPACE_SMBUS:
1523 case ACPI_ADR_SPACE_CMOS:
1524 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1525 case ACPI_ADR_SPACE_DATA_TABLE:
1526 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1527 break;
1528 }
1529 return AE_OK;
1530 }
1531
1532 /******************************************************************************
1533 *
1534 * FUNCTION: acpi_os_validate_address
1535 *
1536 * PARAMETERS: space_id - ACPI space ID
1537 * address - Physical address
1538 * length - Address length
1539 *
1540 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1541 * should return AE_AML_ILLEGAL_ADDRESS.
1542 *
1543 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1544 * the addresses accessed by AML operation regions.
1545 *
1546 *****************************************************************************/
1547
1548 acpi_status
acpi_os_validate_address(u8 space_id,acpi_physical_address address,acpi_size length,char * name)1549 acpi_os_validate_address (
1550 u8 space_id,
1551 acpi_physical_address address,
1552 acpi_size length,
1553 char *name)
1554 {
1555 struct acpi_res_list *res;
1556 int added;
1557 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1558 return AE_OK;
1559
1560 switch (space_id) {
1561 case ACPI_ADR_SPACE_SYSTEM_IO:
1562 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1563 /* Only interference checks against SystemIO and SystemMemory
1564 are needed */
1565 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1566 if (!res)
1567 return AE_OK;
1568 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1569 strlcpy(res->name, name, 5);
1570 res->start = address;
1571 res->end = address + length - 1;
1572 res->resource_type = space_id;
1573 spin_lock(&acpi_res_lock);
1574 added = acpi_res_list_add(res);
1575 spin_unlock(&acpi_res_lock);
1576 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1577 "name: %s\n", added ? "Added" : "Already exist",
1578 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1579 ? "SystemIO" : "System Memory",
1580 (unsigned long long)res->start,
1581 (unsigned long long)res->end,
1582 res->name);
1583 if (!added)
1584 kfree(res);
1585 break;
1586 case ACPI_ADR_SPACE_PCI_CONFIG:
1587 case ACPI_ADR_SPACE_EC:
1588 case ACPI_ADR_SPACE_SMBUS:
1589 case ACPI_ADR_SPACE_CMOS:
1590 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1591 case ACPI_ADR_SPACE_DATA_TABLE:
1592 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1593 break;
1594 }
1595 return AE_OK;
1596 }
1597 #endif
1598
acpi_os_initialize(void)1599 acpi_status __init acpi_os_initialize(void)
1600 {
1601 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1602 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1603 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1604 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1605
1606 return AE_OK;
1607 }
1608
acpi_os_initialize1(void)1609 acpi_status __init acpi_os_initialize1(void)
1610 {
1611 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1612 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1613 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1614 BUG_ON(!kacpid_wq);
1615 BUG_ON(!kacpi_notify_wq);
1616 BUG_ON(!kacpi_hotplug_wq);
1617 acpi_install_interface_handler(acpi_osi_handler);
1618 acpi_osi_setup_late();
1619 return AE_OK;
1620 }
1621
acpi_os_terminate(void)1622 acpi_status acpi_os_terminate(void)
1623 {
1624 if (acpi_irq_handler) {
1625 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1626 acpi_irq_handler);
1627 }
1628
1629 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1630 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1631 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1632 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1633
1634 destroy_workqueue(kacpid_wq);
1635 destroy_workqueue(kacpi_notify_wq);
1636 destroy_workqueue(kacpi_hotplug_wq);
1637
1638 return AE_OK;
1639 }
1640