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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/highmem.h>
31 #include <linux/pci.h>
32 #include <linux/interrupt.h>
33 #include <linux/kmod.h>
34 #include <linux/delay.h>
35 #include <linux/workqueue.h>
36 #include <linux/nmi.h>
37 #include <linux/acpi.h>
38 #include <linux/efi.h>
39 #include <linux/ioport.h>
40 #include <linux/list.h>
41 #include <linux/jiffies.h>
42 #include <linux/semaphore.h>
43
44 #include <asm/io.h>
45 #include <asm/uaccess.h>
46 #include <linux/io-64-nonatomic-lo-hi.h>
47
48 #include "internal.h"
49
50 #define _COMPONENT ACPI_OS_SERVICES
51 ACPI_MODULE_NAME("osl");
52
53 struct acpi_os_dpc {
54 acpi_osd_exec_callback function;
55 void *context;
56 struct work_struct work;
57 };
58
59 #ifdef CONFIG_ACPI_CUSTOM_DSDT
60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
61 #endif
62
63 #ifdef ENABLE_DEBUGGER
64 #include <linux/kdb.h>
65
66 /* stuff for debugger support */
67 int acpi_in_debugger;
68 EXPORT_SYMBOL(acpi_in_debugger);
69 #endif /*ENABLE_DEBUGGER */
70
71 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
72 u32 pm1b_ctrl);
73 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
74 u32 val_b);
75
76 static acpi_osd_handler acpi_irq_handler;
77 static void *acpi_irq_context;
78 static struct workqueue_struct *kacpid_wq;
79 static struct workqueue_struct *kacpi_notify_wq;
80 static struct workqueue_struct *kacpi_hotplug_wq;
81 static bool acpi_os_initialized;
82 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
83
84 /*
85 * This list of permanent mappings is for memory that may be accessed from
86 * interrupt context, where we can't do the ioremap().
87 */
88 struct acpi_ioremap {
89 struct list_head list;
90 void __iomem *virt;
91 acpi_physical_address phys;
92 acpi_size size;
93 unsigned long refcount;
94 };
95
96 static LIST_HEAD(acpi_ioremaps);
97 static DEFINE_MUTEX(acpi_ioremap_lock);
98
99 static void __init acpi_osi_setup_late(void);
100
101 /*
102 * The story of _OSI(Linux)
103 *
104 * From pre-history through Linux-2.6.22,
105 * Linux responded TRUE upon a BIOS OSI(Linux) query.
106 *
107 * Unfortunately, reference BIOS writers got wind of this
108 * and put OSI(Linux) in their example code, quickly exposing
109 * this string as ill-conceived and opening the door to
110 * an un-bounded number of BIOS incompatibilities.
111 *
112 * For example, OSI(Linux) was used on resume to re-POST a
113 * video card on one system, because Linux at that time
114 * could not do a speedy restore in its native driver.
115 * But then upon gaining quick native restore capability,
116 * Linux has no way to tell the BIOS to skip the time-consuming
117 * POST -- putting Linux at a permanent performance disadvantage.
118 * On another system, the BIOS writer used OSI(Linux)
119 * to infer native OS support for IPMI! On other systems,
120 * OSI(Linux) simply got in the way of Linux claiming to
121 * be compatible with other operating systems, exposing
122 * BIOS issues such as skipped device initialization.
123 *
124 * So "Linux" turned out to be a really poor chose of
125 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
126 *
127 * BIOS writers should NOT query _OSI(Linux) on future systems.
128 * Linux will complain on the console when it sees it, and return FALSE.
129 * To get Linux to return TRUE for your system will require
130 * a kernel source update to add a DMI entry,
131 * or boot with "acpi_osi=Linux"
132 */
133
134 static struct osi_linux {
135 unsigned int enable:1;
136 unsigned int dmi:1;
137 unsigned int cmdline:1;
138 u8 default_disabling;
139 } osi_linux = {0, 0, 0, 0};
140
acpi_osi_handler(acpi_string interface,u32 supported)141 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
142 {
143 if (!strcmp("Linux", interface)) {
144
145 printk_once(KERN_NOTICE FW_BUG PREFIX
146 "BIOS _OSI(Linux) query %s%s\n",
147 osi_linux.enable ? "honored" : "ignored",
148 osi_linux.cmdline ? " via cmdline" :
149 osi_linux.dmi ? " via DMI" : "");
150 }
151
152 if (!strcmp("Darwin", interface)) {
153 /*
154 * Apple firmware will behave poorly if it receives positive
155 * answers to "Darwin" and any other OS. Respond positively
156 * to Darwin and then disable all other vendor strings.
157 */
158 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
159 supported = ACPI_UINT32_MAX;
160 }
161
162 return supported;
163 }
164
acpi_request_region(struct acpi_generic_address * gas,unsigned int length,char * desc)165 static void __init acpi_request_region (struct acpi_generic_address *gas,
166 unsigned int length, char *desc)
167 {
168 u64 addr;
169
170 /* Handle possible alignment issues */
171 memcpy(&addr, &gas->address, sizeof(addr));
172 if (!addr || !length)
173 return;
174
175 /* Resources are never freed */
176 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
177 request_region(addr, length, desc);
178 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
179 request_mem_region(addr, length, desc);
180 }
181
acpi_reserve_resources(void)182 static int __init acpi_reserve_resources(void)
183 {
184 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
185 "ACPI PM1a_EVT_BLK");
186
187 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
188 "ACPI PM1b_EVT_BLK");
189
190 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
191 "ACPI PM1a_CNT_BLK");
192
193 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
194 "ACPI PM1b_CNT_BLK");
195
196 if (acpi_gbl_FADT.pm_timer_length == 4)
197 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
198
199 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
200 "ACPI PM2_CNT_BLK");
201
202 /* Length of GPE blocks must be a non-negative multiple of 2 */
203
204 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
205 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
206 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
207
208 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
209 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
210 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
211
212 return 0;
213 }
214 fs_initcall_sync(acpi_reserve_resources);
215
acpi_os_printf(const char * fmt,...)216 void acpi_os_printf(const char *fmt, ...)
217 {
218 va_list args;
219 va_start(args, fmt);
220 acpi_os_vprintf(fmt, args);
221 va_end(args);
222 }
223
acpi_os_vprintf(const char * fmt,va_list args)224 void acpi_os_vprintf(const char *fmt, va_list args)
225 {
226 static char buffer[512];
227
228 vsprintf(buffer, fmt, args);
229
230 #ifdef ENABLE_DEBUGGER
231 if (acpi_in_debugger) {
232 kdb_printf("%s", buffer);
233 } else {
234 printk(KERN_CONT "%s", buffer);
235 }
236 #else
237 printk(KERN_CONT "%s", buffer);
238 #endif
239 }
240
241 #ifdef CONFIG_KEXEC
242 static unsigned long acpi_rsdp;
setup_acpi_rsdp(char * arg)243 static int __init setup_acpi_rsdp(char *arg)
244 {
245 if (kstrtoul(arg, 16, &acpi_rsdp))
246 return -EINVAL;
247 return 0;
248 }
249 early_param("acpi_rsdp", setup_acpi_rsdp);
250 #endif
251
acpi_os_get_root_pointer(void)252 acpi_physical_address __init acpi_os_get_root_pointer(void)
253 {
254 #ifdef CONFIG_KEXEC
255 if (acpi_rsdp)
256 return acpi_rsdp;
257 #endif
258
259 if (efi_enabled(EFI_CONFIG_TABLES)) {
260 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
261 return efi.acpi20;
262 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
263 return efi.acpi;
264 else {
265 printk(KERN_ERR PREFIX
266 "System description tables not found\n");
267 return 0;
268 }
269 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
270 acpi_physical_address pa = 0;
271
272 acpi_find_root_pointer(&pa);
273 return pa;
274 }
275
276 return 0;
277 }
278
279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
280 static struct acpi_ioremap *
acpi_map_lookup(acpi_physical_address phys,acpi_size size)281 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
282 {
283 struct acpi_ioremap *map;
284
285 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
286 if (map->phys <= phys &&
287 phys + size <= map->phys + map->size)
288 return map;
289
290 return NULL;
291 }
292
293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
294 static void __iomem *
acpi_map_vaddr_lookup(acpi_physical_address phys,unsigned int size)295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
296 {
297 struct acpi_ioremap *map;
298
299 map = acpi_map_lookup(phys, size);
300 if (map)
301 return map->virt + (phys - map->phys);
302
303 return NULL;
304 }
305
acpi_os_get_iomem(acpi_physical_address phys,unsigned int size)306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
307 {
308 struct acpi_ioremap *map;
309 void __iomem *virt = NULL;
310
311 mutex_lock(&acpi_ioremap_lock);
312 map = acpi_map_lookup(phys, size);
313 if (map) {
314 virt = map->virt + (phys - map->phys);
315 map->refcount++;
316 }
317 mutex_unlock(&acpi_ioremap_lock);
318 return virt;
319 }
320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
321
322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
323 static struct acpi_ioremap *
acpi_map_lookup_virt(void __iomem * virt,acpi_size size)324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
325 {
326 struct acpi_ioremap *map;
327
328 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
329 if (map->virt <= virt &&
330 virt + size <= map->virt + map->size)
331 return map;
332
333 return NULL;
334 }
335
336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
337 /* ioremap will take care of cache attributes */
338 #define should_use_kmap(pfn) 0
339 #else
340 #define should_use_kmap(pfn) page_is_ram(pfn)
341 #endif
342
acpi_map(acpi_physical_address pg_off,unsigned long pg_sz)343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
344 {
345 unsigned long pfn;
346
347 pfn = pg_off >> PAGE_SHIFT;
348 if (should_use_kmap(pfn)) {
349 if (pg_sz > PAGE_SIZE)
350 return NULL;
351 return (void __iomem __force *)kmap(pfn_to_page(pfn));
352 } else
353 return acpi_os_ioremap(pg_off, pg_sz);
354 }
355
acpi_unmap(acpi_physical_address pg_off,void __iomem * vaddr)356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
357 {
358 unsigned long pfn;
359
360 pfn = pg_off >> PAGE_SHIFT;
361 if (should_use_kmap(pfn))
362 kunmap(pfn_to_page(pfn));
363 else
364 iounmap(vaddr);
365 }
366
367 void __iomem *__init_refok
acpi_os_map_iomem(acpi_physical_address phys,acpi_size size)368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
369 {
370 struct acpi_ioremap *map;
371 void __iomem *virt;
372 acpi_physical_address pg_off;
373 acpi_size pg_sz;
374
375 if (phys > ULONG_MAX) {
376 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
377 return NULL;
378 }
379
380 if (!acpi_gbl_permanent_mmap)
381 return __acpi_map_table((unsigned long)phys, size);
382
383 mutex_lock(&acpi_ioremap_lock);
384 /* Check if there's a suitable mapping already. */
385 map = acpi_map_lookup(phys, size);
386 if (map) {
387 map->refcount++;
388 goto out;
389 }
390
391 map = kzalloc(sizeof(*map), GFP_KERNEL);
392 if (!map) {
393 mutex_unlock(&acpi_ioremap_lock);
394 return NULL;
395 }
396
397 pg_off = round_down(phys, PAGE_SIZE);
398 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
399 virt = acpi_map(pg_off, pg_sz);
400 if (!virt) {
401 mutex_unlock(&acpi_ioremap_lock);
402 kfree(map);
403 return NULL;
404 }
405
406 INIT_LIST_HEAD(&map->list);
407 map->virt = virt;
408 map->phys = pg_off;
409 map->size = pg_sz;
410 map->refcount = 1;
411
412 list_add_tail_rcu(&map->list, &acpi_ioremaps);
413
414 out:
415 mutex_unlock(&acpi_ioremap_lock);
416 return map->virt + (phys - map->phys);
417 }
418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
419
420 void *__init_refok
acpi_os_map_memory(acpi_physical_address phys,acpi_size size)421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
422 {
423 return (void *)acpi_os_map_iomem(phys, size);
424 }
425 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
426
acpi_os_drop_map_ref(struct acpi_ioremap * map)427 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
428 {
429 if (!--map->refcount)
430 list_del_rcu(&map->list);
431 }
432
acpi_os_map_cleanup(struct acpi_ioremap * map)433 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
434 {
435 if (!map->refcount) {
436 synchronize_rcu_expedited();
437 acpi_unmap(map->phys, map->virt);
438 kfree(map);
439 }
440 }
441
acpi_os_unmap_iomem(void __iomem * virt,acpi_size size)442 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
443 {
444 struct acpi_ioremap *map;
445
446 if (!acpi_gbl_permanent_mmap) {
447 __acpi_unmap_table(virt, size);
448 return;
449 }
450
451 mutex_lock(&acpi_ioremap_lock);
452 map = acpi_map_lookup_virt(virt, size);
453 if (!map) {
454 mutex_unlock(&acpi_ioremap_lock);
455 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
456 return;
457 }
458 acpi_os_drop_map_ref(map);
459 mutex_unlock(&acpi_ioremap_lock);
460
461 acpi_os_map_cleanup(map);
462 }
463 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
464
acpi_os_unmap_memory(void * virt,acpi_size size)465 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
466 {
467 return acpi_os_unmap_iomem((void __iomem *)virt, size);
468 }
469 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
470
early_acpi_os_unmap_memory(void __iomem * virt,acpi_size size)471 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
472 {
473 if (!acpi_gbl_permanent_mmap)
474 __acpi_unmap_table(virt, size);
475 }
476
acpi_os_map_generic_address(struct acpi_generic_address * gas)477 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
478 {
479 u64 addr;
480 void __iomem *virt;
481
482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 return 0;
484
485 /* Handle possible alignment issues */
486 memcpy(&addr, &gas->address, sizeof(addr));
487 if (!addr || !gas->bit_width)
488 return -EINVAL;
489
490 virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
491 if (!virt)
492 return -EIO;
493
494 return 0;
495 }
496 EXPORT_SYMBOL(acpi_os_map_generic_address);
497
acpi_os_unmap_generic_address(struct acpi_generic_address * gas)498 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
499 {
500 u64 addr;
501 struct acpi_ioremap *map;
502
503 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
504 return;
505
506 /* Handle possible alignment issues */
507 memcpy(&addr, &gas->address, sizeof(addr));
508 if (!addr || !gas->bit_width)
509 return;
510
511 mutex_lock(&acpi_ioremap_lock);
512 map = acpi_map_lookup(addr, gas->bit_width / 8);
513 if (!map) {
514 mutex_unlock(&acpi_ioremap_lock);
515 return;
516 }
517 acpi_os_drop_map_ref(map);
518 mutex_unlock(&acpi_ioremap_lock);
519
520 acpi_os_map_cleanup(map);
521 }
522 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
523
524 #ifdef ACPI_FUTURE_USAGE
525 acpi_status
acpi_os_get_physical_address(void * virt,acpi_physical_address * phys)526 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
527 {
528 if (!phys || !virt)
529 return AE_BAD_PARAMETER;
530
531 *phys = virt_to_phys(virt);
532
533 return AE_OK;
534 }
535 #endif
536
537 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
538 static bool acpi_rev_override;
539
acpi_rev_override_setup(char * str)540 int __init acpi_rev_override_setup(char *str)
541 {
542 acpi_rev_override = true;
543 return 1;
544 }
545 __setup("acpi_rev_override", acpi_rev_override_setup);
546 #else
547 #define acpi_rev_override false
548 #endif
549
550 #define ACPI_MAX_OVERRIDE_LEN 100
551
552 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
553
554 acpi_status
acpi_os_predefined_override(const struct acpi_predefined_names * init_val,char ** new_val)555 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
556 char **new_val)
557 {
558 if (!init_val || !new_val)
559 return AE_BAD_PARAMETER;
560
561 *new_val = NULL;
562 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
563 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
564 acpi_os_name);
565 *new_val = acpi_os_name;
566 }
567
568 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
569 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
570 *new_val = (char *)5;
571 }
572
573 return AE_OK;
574 }
575
576 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
577 #include <linux/earlycpio.h>
578 #include <linux/memblock.h>
579
580 static u64 acpi_tables_addr;
581 static int all_tables_size;
582
583 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
acpi_table_checksum(u8 * buffer,u32 length)584 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
585 {
586 u8 sum = 0;
587 u8 *end = buffer + length;
588
589 while (buffer < end)
590 sum = (u8) (sum + *(buffer++));
591 return sum;
592 }
593
594 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
595 static const char * const table_sigs[] = {
596 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
597 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
598 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
599 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
600 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
601 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
602 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
603 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
604 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
605
606 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
607
608 #define ACPI_OVERRIDE_TABLES 64
609 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
610
611 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
612
acpi_initrd_override(void * data,size_t size)613 void __init acpi_initrd_override(void *data, size_t size)
614 {
615 int sig, no, table_nr = 0, total_offset = 0;
616 long offset = 0;
617 struct acpi_table_header *table;
618 char cpio_path[32] = "kernel/firmware/acpi/";
619 struct cpio_data file;
620
621 if (data == NULL || size == 0)
622 return;
623
624 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
625 file = find_cpio_data(cpio_path, data, size, &offset);
626 if (!file.data)
627 break;
628
629 data += offset;
630 size -= offset;
631
632 if (file.size < sizeof(struct acpi_table_header)) {
633 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
634 cpio_path, file.name);
635 continue;
636 }
637
638 table = file.data;
639
640 for (sig = 0; table_sigs[sig]; sig++)
641 if (!memcmp(table->signature, table_sigs[sig], 4))
642 break;
643
644 if (!table_sigs[sig]) {
645 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
646 cpio_path, file.name);
647 continue;
648 }
649 if (file.size != table->length) {
650 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
651 cpio_path, file.name);
652 continue;
653 }
654 if (acpi_table_checksum(file.data, table->length)) {
655 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
656 cpio_path, file.name);
657 continue;
658 }
659
660 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
661 table->signature, cpio_path, file.name, table->length);
662
663 all_tables_size += table->length;
664 acpi_initrd_files[table_nr].data = file.data;
665 acpi_initrd_files[table_nr].size = file.size;
666 table_nr++;
667 }
668 if (table_nr == 0)
669 return;
670
671 acpi_tables_addr =
672 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
673 all_tables_size, PAGE_SIZE);
674 if (!acpi_tables_addr) {
675 WARN_ON(1);
676 return;
677 }
678 /*
679 * Only calling e820_add_reserve does not work and the
680 * tables are invalid (memory got used) later.
681 * memblock_reserve works as expected and the tables won't get modified.
682 * But it's not enough on X86 because ioremap will
683 * complain later (used by acpi_os_map_memory) that the pages
684 * that should get mapped are not marked "reserved".
685 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
686 * works fine.
687 */
688 memblock_reserve(acpi_tables_addr, all_tables_size);
689 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
690
691 /*
692 * early_ioremap only can remap 256k one time. If we map all
693 * tables one time, we will hit the limit. Need to map chunks
694 * one by one during copying the same as that in relocate_initrd().
695 */
696 for (no = 0; no < table_nr; no++) {
697 unsigned char *src_p = acpi_initrd_files[no].data;
698 phys_addr_t size = acpi_initrd_files[no].size;
699 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
700 phys_addr_t slop, clen;
701 char *dest_p;
702
703 total_offset += size;
704
705 while (size) {
706 slop = dest_addr & ~PAGE_MASK;
707 clen = size;
708 if (clen > MAP_CHUNK_SIZE - slop)
709 clen = MAP_CHUNK_SIZE - slop;
710 dest_p = early_ioremap(dest_addr & PAGE_MASK,
711 clen + slop);
712 memcpy(dest_p + slop, src_p, clen);
713 early_iounmap(dest_p, clen + slop);
714 src_p += clen;
715 dest_addr += clen;
716 size -= clen;
717 }
718 }
719 }
720 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
721
acpi_table_taint(struct acpi_table_header * table)722 static void acpi_table_taint(struct acpi_table_header *table)
723 {
724 pr_warn(PREFIX
725 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
726 table->signature, table->oem_table_id);
727 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
728 }
729
730
731 acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)732 acpi_os_table_override(struct acpi_table_header * existing_table,
733 struct acpi_table_header ** new_table)
734 {
735 if (!existing_table || !new_table)
736 return AE_BAD_PARAMETER;
737
738 *new_table = NULL;
739
740 #ifdef CONFIG_ACPI_CUSTOM_DSDT
741 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
742 *new_table = (struct acpi_table_header *)AmlCode;
743 #endif
744 if (*new_table != NULL)
745 acpi_table_taint(existing_table);
746 return AE_OK;
747 }
748
749 acpi_status
acpi_os_physical_table_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)750 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
751 acpi_physical_address *address,
752 u32 *table_length)
753 {
754 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
755 *table_length = 0;
756 *address = 0;
757 return AE_OK;
758 #else
759 int table_offset = 0;
760 struct acpi_table_header *table;
761
762 *table_length = 0;
763 *address = 0;
764
765 if (!acpi_tables_addr)
766 return AE_OK;
767
768 do {
769 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
770 WARN_ON(1);
771 return AE_OK;
772 }
773
774 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
775 ACPI_HEADER_SIZE);
776
777 if (table_offset + table->length > all_tables_size) {
778 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
779 WARN_ON(1);
780 return AE_OK;
781 }
782
783 table_offset += table->length;
784
785 if (memcmp(existing_table->signature, table->signature, 4)) {
786 acpi_os_unmap_memory(table,
787 ACPI_HEADER_SIZE);
788 continue;
789 }
790
791 /* Only override tables with matching oem id */
792 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
793 ACPI_OEM_TABLE_ID_SIZE)) {
794 acpi_os_unmap_memory(table,
795 ACPI_HEADER_SIZE);
796 continue;
797 }
798
799 table_offset -= table->length;
800 *table_length = table->length;
801 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
802 *address = acpi_tables_addr + table_offset;
803 break;
804 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
805
806 if (*address != 0)
807 acpi_table_taint(existing_table);
808 return AE_OK;
809 #endif
810 }
811
acpi_irq(int irq,void * dev_id)812 static irqreturn_t acpi_irq(int irq, void *dev_id)
813 {
814 u32 handled;
815
816 handled = (*acpi_irq_handler) (acpi_irq_context);
817
818 if (handled) {
819 acpi_irq_handled++;
820 return IRQ_HANDLED;
821 } else {
822 acpi_irq_not_handled++;
823 return IRQ_NONE;
824 }
825 }
826
827 acpi_status
acpi_os_install_interrupt_handler(u32 gsi,acpi_osd_handler handler,void * context)828 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
829 void *context)
830 {
831 unsigned int irq;
832
833 acpi_irq_stats_init();
834
835 /*
836 * ACPI interrupts different from the SCI in our copy of the FADT are
837 * not supported.
838 */
839 if (gsi != acpi_gbl_FADT.sci_interrupt)
840 return AE_BAD_PARAMETER;
841
842 if (acpi_irq_handler)
843 return AE_ALREADY_ACQUIRED;
844
845 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
846 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
847 gsi);
848 return AE_OK;
849 }
850
851 acpi_irq_handler = handler;
852 acpi_irq_context = context;
853 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
854 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
855 acpi_irq_handler = NULL;
856 return AE_NOT_ACQUIRED;
857 }
858 acpi_sci_irq = irq;
859
860 return AE_OK;
861 }
862
acpi_os_remove_interrupt_handler(u32 gsi,acpi_osd_handler handler)863 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
864 {
865 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
866 return AE_BAD_PARAMETER;
867
868 free_irq(acpi_sci_irq, acpi_irq);
869 acpi_irq_handler = NULL;
870 acpi_sci_irq = INVALID_ACPI_IRQ;
871
872 return AE_OK;
873 }
874
875 /*
876 * Running in interpreter thread context, safe to sleep
877 */
878
acpi_os_sleep(u64 ms)879 void acpi_os_sleep(u64 ms)
880 {
881 msleep(ms);
882 }
883
acpi_os_stall(u32 us)884 void acpi_os_stall(u32 us)
885 {
886 while (us) {
887 u32 delay = 1000;
888
889 if (delay > us)
890 delay = us;
891 udelay(delay);
892 touch_nmi_watchdog();
893 us -= delay;
894 }
895 }
896
897 /*
898 * Support ACPI 3.0 AML Timer operand
899 * Returns 64-bit free-running, monotonically increasing timer
900 * with 100ns granularity
901 */
acpi_os_get_timer(void)902 u64 acpi_os_get_timer(void)
903 {
904 u64 time_ns = ktime_to_ns(ktime_get());
905 do_div(time_ns, 100);
906 return time_ns;
907 }
908
acpi_os_read_port(acpi_io_address port,u32 * value,u32 width)909 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
910 {
911 u32 dummy;
912
913 if (!value)
914 value = &dummy;
915
916 *value = 0;
917 if (width <= 8) {
918 *(u8 *) value = inb(port);
919 } else if (width <= 16) {
920 *(u16 *) value = inw(port);
921 } else if (width <= 32) {
922 *(u32 *) value = inl(port);
923 } else {
924 BUG();
925 }
926
927 return AE_OK;
928 }
929
930 EXPORT_SYMBOL(acpi_os_read_port);
931
acpi_os_write_port(acpi_io_address port,u32 value,u32 width)932 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
933 {
934 if (width <= 8) {
935 outb(value, port);
936 } else if (width <= 16) {
937 outw(value, port);
938 } else if (width <= 32) {
939 outl(value, port);
940 } else {
941 BUG();
942 }
943
944 return AE_OK;
945 }
946
947 EXPORT_SYMBOL(acpi_os_write_port);
948
949 acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr,u64 * value,u32 width)950 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
951 {
952 void __iomem *virt_addr;
953 unsigned int size = width / 8;
954 bool unmap = false;
955 u64 dummy;
956
957 rcu_read_lock();
958 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
959 if (!virt_addr) {
960 rcu_read_unlock();
961 virt_addr = acpi_os_ioremap(phys_addr, size);
962 if (!virt_addr)
963 return AE_BAD_ADDRESS;
964 unmap = true;
965 }
966
967 if (!value)
968 value = &dummy;
969
970 switch (width) {
971 case 8:
972 *(u8 *) value = readb(virt_addr);
973 break;
974 case 16:
975 *(u16 *) value = readw(virt_addr);
976 break;
977 case 32:
978 *(u32 *) value = readl(virt_addr);
979 break;
980 case 64:
981 *(u64 *) value = readq(virt_addr);
982 break;
983 default:
984 BUG();
985 }
986
987 if (unmap)
988 iounmap(virt_addr);
989 else
990 rcu_read_unlock();
991
992 return AE_OK;
993 }
994
995 acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr,u64 value,u32 width)996 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
997 {
998 void __iomem *virt_addr;
999 unsigned int size = width / 8;
1000 bool unmap = false;
1001
1002 rcu_read_lock();
1003 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1004 if (!virt_addr) {
1005 rcu_read_unlock();
1006 virt_addr = acpi_os_ioremap(phys_addr, size);
1007 if (!virt_addr)
1008 return AE_BAD_ADDRESS;
1009 unmap = true;
1010 }
1011
1012 switch (width) {
1013 case 8:
1014 writeb(value, virt_addr);
1015 break;
1016 case 16:
1017 writew(value, virt_addr);
1018 break;
1019 case 32:
1020 writel(value, virt_addr);
1021 break;
1022 case 64:
1023 writeq(value, virt_addr);
1024 break;
1025 default:
1026 BUG();
1027 }
1028
1029 if (unmap)
1030 iounmap(virt_addr);
1031 else
1032 rcu_read_unlock();
1033
1034 return AE_OK;
1035 }
1036
1037 acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id,u32 reg,u64 * value,u32 width)1038 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1039 u64 *value, u32 width)
1040 {
1041 int result, size;
1042 u32 value32;
1043
1044 if (!value)
1045 return AE_BAD_PARAMETER;
1046
1047 switch (width) {
1048 case 8:
1049 size = 1;
1050 break;
1051 case 16:
1052 size = 2;
1053 break;
1054 case 32:
1055 size = 4;
1056 break;
1057 default:
1058 return AE_ERROR;
1059 }
1060
1061 result = raw_pci_read(pci_id->segment, pci_id->bus,
1062 PCI_DEVFN(pci_id->device, pci_id->function),
1063 reg, size, &value32);
1064 *value = value32;
1065
1066 return (result ? AE_ERROR : AE_OK);
1067 }
1068
1069 acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id,u32 reg,u64 value,u32 width)1070 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1071 u64 value, u32 width)
1072 {
1073 int result, size;
1074
1075 switch (width) {
1076 case 8:
1077 size = 1;
1078 break;
1079 case 16:
1080 size = 2;
1081 break;
1082 case 32:
1083 size = 4;
1084 break;
1085 default:
1086 return AE_ERROR;
1087 }
1088
1089 result = raw_pci_write(pci_id->segment, pci_id->bus,
1090 PCI_DEVFN(pci_id->device, pci_id->function),
1091 reg, size, value);
1092
1093 return (result ? AE_ERROR : AE_OK);
1094 }
1095
acpi_os_execute_deferred(struct work_struct * work)1096 static void acpi_os_execute_deferred(struct work_struct *work)
1097 {
1098 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1099
1100 dpc->function(dpc->context);
1101 kfree(dpc);
1102 }
1103
1104 /*******************************************************************************
1105 *
1106 * FUNCTION: acpi_os_execute
1107 *
1108 * PARAMETERS: Type - Type of the callback
1109 * Function - Function to be executed
1110 * Context - Function parameters
1111 *
1112 * RETURN: Status
1113 *
1114 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1115 * immediately executes function on a separate thread.
1116 *
1117 ******************************************************************************/
1118
acpi_os_execute(acpi_execute_type type,acpi_osd_exec_callback function,void * context)1119 acpi_status acpi_os_execute(acpi_execute_type type,
1120 acpi_osd_exec_callback function, void *context)
1121 {
1122 acpi_status status = AE_OK;
1123 struct acpi_os_dpc *dpc;
1124 struct workqueue_struct *queue;
1125 int ret;
1126 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1127 "Scheduling function [%p(%p)] for deferred execution.\n",
1128 function, context));
1129
1130 /*
1131 * Allocate/initialize DPC structure. Note that this memory will be
1132 * freed by the callee. The kernel handles the work_struct list in a
1133 * way that allows us to also free its memory inside the callee.
1134 * Because we may want to schedule several tasks with different
1135 * parameters we can't use the approach some kernel code uses of
1136 * having a static work_struct.
1137 */
1138
1139 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1140 if (!dpc)
1141 return AE_NO_MEMORY;
1142
1143 dpc->function = function;
1144 dpc->context = context;
1145
1146 /*
1147 * To prevent lockdep from complaining unnecessarily, make sure that
1148 * there is a different static lockdep key for each workqueue by using
1149 * INIT_WORK() for each of them separately.
1150 */
1151 if (type == OSL_NOTIFY_HANDLER) {
1152 queue = kacpi_notify_wq;
1153 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1154 } else {
1155 queue = kacpid_wq;
1156 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1157 }
1158
1159 /*
1160 * On some machines, a software-initiated SMI causes corruption unless
1161 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1162 * typically it's done in GPE-related methods that are run via
1163 * workqueues, so we can avoid the known corruption cases by always
1164 * queueing on CPU 0.
1165 */
1166 ret = queue_work_on(0, queue, &dpc->work);
1167
1168 if (!ret) {
1169 printk(KERN_ERR PREFIX
1170 "Call to queue_work() failed.\n");
1171 status = AE_ERROR;
1172 kfree(dpc);
1173 }
1174 return status;
1175 }
1176 EXPORT_SYMBOL(acpi_os_execute);
1177
acpi_os_wait_events_complete(void)1178 void acpi_os_wait_events_complete(void)
1179 {
1180 /*
1181 * Make sure the GPE handler or the fixed event handler is not used
1182 * on another CPU after removal.
1183 */
1184 if (acpi_sci_irq_valid())
1185 synchronize_hardirq(acpi_sci_irq);
1186 flush_workqueue(kacpid_wq);
1187 flush_workqueue(kacpi_notify_wq);
1188 }
1189
1190 struct acpi_hp_work {
1191 struct work_struct work;
1192 struct acpi_device *adev;
1193 u32 src;
1194 };
1195
acpi_hotplug_work_fn(struct work_struct * work)1196 static void acpi_hotplug_work_fn(struct work_struct *work)
1197 {
1198 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1199
1200 acpi_os_wait_events_complete();
1201 acpi_device_hotplug(hpw->adev, hpw->src);
1202 kfree(hpw);
1203 }
1204
acpi_hotplug_schedule(struct acpi_device * adev,u32 src)1205 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1206 {
1207 struct acpi_hp_work *hpw;
1208
1209 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1210 "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1211 adev, src));
1212
1213 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1214 if (!hpw)
1215 return AE_NO_MEMORY;
1216
1217 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1218 hpw->adev = adev;
1219 hpw->src = src;
1220 /*
1221 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1222 * the hotplug code may call driver .remove() functions, which may
1223 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1224 * these workqueues.
1225 */
1226 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1227 kfree(hpw);
1228 return AE_ERROR;
1229 }
1230 return AE_OK;
1231 }
1232
acpi_queue_hotplug_work(struct work_struct * work)1233 bool acpi_queue_hotplug_work(struct work_struct *work)
1234 {
1235 return queue_work(kacpi_hotplug_wq, work);
1236 }
1237
1238 acpi_status
acpi_os_create_semaphore(u32 max_units,u32 initial_units,acpi_handle * handle)1239 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1240 {
1241 struct semaphore *sem = NULL;
1242
1243 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1244 if (!sem)
1245 return AE_NO_MEMORY;
1246
1247 sema_init(sem, initial_units);
1248
1249 *handle = (acpi_handle *) sem;
1250
1251 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1252 *handle, initial_units));
1253
1254 return AE_OK;
1255 }
1256
1257 /*
1258 * TODO: A better way to delete semaphores? Linux doesn't have a
1259 * 'delete_semaphore()' function -- may result in an invalid
1260 * pointer dereference for non-synchronized consumers. Should
1261 * we at least check for blocked threads and signal/cancel them?
1262 */
1263
acpi_os_delete_semaphore(acpi_handle handle)1264 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1265 {
1266 struct semaphore *sem = (struct semaphore *)handle;
1267
1268 if (!sem)
1269 return AE_BAD_PARAMETER;
1270
1271 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1272
1273 BUG_ON(!list_empty(&sem->wait_list));
1274 kfree(sem);
1275 sem = NULL;
1276
1277 return AE_OK;
1278 }
1279
1280 /*
1281 * TODO: Support for units > 1?
1282 */
acpi_os_wait_semaphore(acpi_handle handle,u32 units,u16 timeout)1283 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1284 {
1285 acpi_status status = AE_OK;
1286 struct semaphore *sem = (struct semaphore *)handle;
1287 long jiffies;
1288 int ret = 0;
1289
1290 if (!acpi_os_initialized)
1291 return AE_OK;
1292
1293 if (!sem || (units < 1))
1294 return AE_BAD_PARAMETER;
1295
1296 if (units > 1)
1297 return AE_SUPPORT;
1298
1299 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1300 handle, units, timeout));
1301
1302 if (timeout == ACPI_WAIT_FOREVER)
1303 jiffies = MAX_SCHEDULE_TIMEOUT;
1304 else
1305 jiffies = msecs_to_jiffies(timeout);
1306
1307 ret = down_timeout(sem, jiffies);
1308 if (ret)
1309 status = AE_TIME;
1310
1311 if (ACPI_FAILURE(status)) {
1312 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1313 "Failed to acquire semaphore[%p|%d|%d], %s",
1314 handle, units, timeout,
1315 acpi_format_exception(status)));
1316 } else {
1317 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1318 "Acquired semaphore[%p|%d|%d]", handle,
1319 units, timeout));
1320 }
1321
1322 return status;
1323 }
1324
1325 /*
1326 * TODO: Support for units > 1?
1327 */
acpi_os_signal_semaphore(acpi_handle handle,u32 units)1328 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1329 {
1330 struct semaphore *sem = (struct semaphore *)handle;
1331
1332 if (!acpi_os_initialized)
1333 return AE_OK;
1334
1335 if (!sem || (units < 1))
1336 return AE_BAD_PARAMETER;
1337
1338 if (units > 1)
1339 return AE_SUPPORT;
1340
1341 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1342 units));
1343
1344 up(sem);
1345
1346 return AE_OK;
1347 }
1348
acpi_os_get_line(char * buffer,u32 buffer_length,u32 * bytes_read)1349 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1350 {
1351 #ifdef ENABLE_DEBUGGER
1352 if (acpi_in_debugger) {
1353 u32 chars;
1354
1355 kdb_read(buffer, buffer_length);
1356
1357 /* remove the CR kdb includes */
1358 chars = strlen(buffer) - 1;
1359 buffer[chars] = '\0';
1360 }
1361 #endif
1362
1363 return AE_OK;
1364 }
1365
acpi_os_signal(u32 function,void * info)1366 acpi_status acpi_os_signal(u32 function, void *info)
1367 {
1368 switch (function) {
1369 case ACPI_SIGNAL_FATAL:
1370 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1371 break;
1372 case ACPI_SIGNAL_BREAKPOINT:
1373 /*
1374 * AML Breakpoint
1375 * ACPI spec. says to treat it as a NOP unless
1376 * you are debugging. So if/when we integrate
1377 * AML debugger into the kernel debugger its
1378 * hook will go here. But until then it is
1379 * not useful to print anything on breakpoints.
1380 */
1381 break;
1382 default:
1383 break;
1384 }
1385
1386 return AE_OK;
1387 }
1388
acpi_os_name_setup(char * str)1389 static int __init acpi_os_name_setup(char *str)
1390 {
1391 char *p = acpi_os_name;
1392 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1393
1394 if (!str || !*str)
1395 return 0;
1396
1397 for (; count-- && *str; str++) {
1398 if (isalnum(*str) || *str == ' ' || *str == ':')
1399 *p++ = *str;
1400 else if (*str == '\'' || *str == '"')
1401 continue;
1402 else
1403 break;
1404 }
1405 *p = 0;
1406
1407 return 1;
1408
1409 }
1410
1411 __setup("acpi_os_name=", acpi_os_name_setup);
1412
1413 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1414 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1415
1416 struct osi_setup_entry {
1417 char string[OSI_STRING_LENGTH_MAX];
1418 bool enable;
1419 };
1420
1421 static struct osi_setup_entry
1422 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1423 {"Module Device", true},
1424 {"Processor Device", true},
1425 {"3.0 _SCP Extensions", true},
1426 {"Processor Aggregator Device", true},
1427 };
1428
acpi_osi_setup(char * str)1429 void __init acpi_osi_setup(char *str)
1430 {
1431 struct osi_setup_entry *osi;
1432 bool enable = true;
1433 int i;
1434
1435 if (!acpi_gbl_create_osi_method)
1436 return;
1437
1438 if (str == NULL || *str == '\0') {
1439 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1440 acpi_gbl_create_osi_method = FALSE;
1441 return;
1442 }
1443
1444 if (*str == '!') {
1445 str++;
1446 if (*str == '\0') {
1447 /* Do not override acpi_osi=!* */
1448 if (!osi_linux.default_disabling)
1449 osi_linux.default_disabling =
1450 ACPI_DISABLE_ALL_VENDOR_STRINGS;
1451 return;
1452 } else if (*str == '*') {
1453 osi_linux.default_disabling = ACPI_DISABLE_ALL_STRINGS;
1454 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1455 osi = &osi_setup_entries[i];
1456 osi->enable = false;
1457 }
1458 return;
1459 }
1460 enable = false;
1461 }
1462
1463 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1464 osi = &osi_setup_entries[i];
1465 if (!strcmp(osi->string, str)) {
1466 osi->enable = enable;
1467 break;
1468 } else if (osi->string[0] == '\0') {
1469 osi->enable = enable;
1470 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1471 break;
1472 }
1473 }
1474 }
1475
set_osi_linux(unsigned int enable)1476 static void __init set_osi_linux(unsigned int enable)
1477 {
1478 if (osi_linux.enable != enable)
1479 osi_linux.enable = enable;
1480
1481 if (osi_linux.enable)
1482 acpi_osi_setup("Linux");
1483 else
1484 acpi_osi_setup("!Linux");
1485
1486 return;
1487 }
1488
acpi_cmdline_osi_linux(unsigned int enable)1489 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1490 {
1491 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1492 osi_linux.dmi = 0;
1493 set_osi_linux(enable);
1494
1495 return;
1496 }
1497
acpi_dmi_osi_linux(int enable,const struct dmi_system_id * d)1498 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1499 {
1500 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1501
1502 if (enable == -1)
1503 return;
1504
1505 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1506 set_osi_linux(enable);
1507
1508 return;
1509 }
1510
1511 /*
1512 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1513 *
1514 * empty string disables _OSI
1515 * string starting with '!' disables that string
1516 * otherwise string is added to list, augmenting built-in strings
1517 */
acpi_osi_setup_late(void)1518 static void __init acpi_osi_setup_late(void)
1519 {
1520 struct osi_setup_entry *osi;
1521 char *str;
1522 int i;
1523 acpi_status status;
1524
1525 if (osi_linux.default_disabling) {
1526 status = acpi_update_interfaces(osi_linux.default_disabling);
1527
1528 if (ACPI_SUCCESS(status))
1529 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors%s\n",
1530 osi_linux.default_disabling ==
1531 ACPI_DISABLE_ALL_STRINGS ?
1532 " and feature groups" : "");
1533 }
1534
1535 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1536 osi = &osi_setup_entries[i];
1537 str = osi->string;
1538
1539 if (*str == '\0')
1540 break;
1541 if (osi->enable) {
1542 status = acpi_install_interface(str);
1543
1544 if (ACPI_SUCCESS(status))
1545 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1546 } else {
1547 status = acpi_remove_interface(str);
1548
1549 if (ACPI_SUCCESS(status))
1550 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1551 }
1552 }
1553 }
1554
osi_setup(char * str)1555 static int __init osi_setup(char *str)
1556 {
1557 if (str && !strcmp("Linux", str))
1558 acpi_cmdline_osi_linux(1);
1559 else if (str && !strcmp("!Linux", str))
1560 acpi_cmdline_osi_linux(0);
1561 else
1562 acpi_osi_setup(str);
1563
1564 return 1;
1565 }
1566
1567 __setup("acpi_osi=", osi_setup);
1568
1569 /*
1570 * Disable the auto-serialization of named objects creation methods.
1571 *
1572 * This feature is enabled by default. It marks the AML control methods
1573 * that contain the opcodes to create named objects as "Serialized".
1574 */
acpi_no_auto_serialize_setup(char * str)1575 static int __init acpi_no_auto_serialize_setup(char *str)
1576 {
1577 acpi_gbl_auto_serialize_methods = FALSE;
1578 pr_info("ACPI: auto-serialization disabled\n");
1579
1580 return 1;
1581 }
1582
1583 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1584
1585 /* Check of resource interference between native drivers and ACPI
1586 * OperationRegions (SystemIO and System Memory only).
1587 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1588 * in arbitrary AML code and can interfere with legacy drivers.
1589 * acpi_enforce_resources= can be set to:
1590 *
1591 * - strict (default) (2)
1592 * -> further driver trying to access the resources will not load
1593 * - lax (1)
1594 * -> further driver trying to access the resources will load, but you
1595 * get a system message that something might go wrong...
1596 *
1597 * - no (0)
1598 * -> ACPI Operation Region resources will not be registered
1599 *
1600 */
1601 #define ENFORCE_RESOURCES_STRICT 2
1602 #define ENFORCE_RESOURCES_LAX 1
1603 #define ENFORCE_RESOURCES_NO 0
1604
1605 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1606
acpi_enforce_resources_setup(char * str)1607 static int __init acpi_enforce_resources_setup(char *str)
1608 {
1609 if (str == NULL || *str == '\0')
1610 return 0;
1611
1612 if (!strcmp("strict", str))
1613 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1614 else if (!strcmp("lax", str))
1615 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1616 else if (!strcmp("no", str))
1617 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1618
1619 return 1;
1620 }
1621
1622 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1623
1624 /* Check for resource conflicts between ACPI OperationRegions and native
1625 * drivers */
acpi_check_resource_conflict(const struct resource * res)1626 int acpi_check_resource_conflict(const struct resource *res)
1627 {
1628 acpi_adr_space_type space_id;
1629 acpi_size length;
1630 u8 warn = 0;
1631 int clash = 0;
1632
1633 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1634 return 0;
1635 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1636 return 0;
1637
1638 if (res->flags & IORESOURCE_IO)
1639 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1640 else
1641 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1642
1643 length = resource_size(res);
1644 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1645 warn = 1;
1646 clash = acpi_check_address_range(space_id, res->start, length, warn);
1647
1648 if (clash) {
1649 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1650 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1651 printk(KERN_NOTICE "ACPI: This conflict may"
1652 " cause random problems and system"
1653 " instability\n");
1654 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1655 " for this device, you should use it instead of"
1656 " the native driver\n");
1657 }
1658 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1659 return -EBUSY;
1660 }
1661 return 0;
1662 }
1663 EXPORT_SYMBOL(acpi_check_resource_conflict);
1664
acpi_check_region(resource_size_t start,resource_size_t n,const char * name)1665 int acpi_check_region(resource_size_t start, resource_size_t n,
1666 const char *name)
1667 {
1668 struct resource res = {
1669 .start = start,
1670 .end = start + n - 1,
1671 .name = name,
1672 .flags = IORESOURCE_IO,
1673 };
1674
1675 return acpi_check_resource_conflict(&res);
1676 }
1677 EXPORT_SYMBOL(acpi_check_region);
1678
1679 /*
1680 * Let drivers know whether the resource checks are effective
1681 */
acpi_resources_are_enforced(void)1682 int acpi_resources_are_enforced(void)
1683 {
1684 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1685 }
1686 EXPORT_SYMBOL(acpi_resources_are_enforced);
1687
acpi_osi_is_win8(void)1688 bool acpi_osi_is_win8(void)
1689 {
1690 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
1691 }
1692 EXPORT_SYMBOL(acpi_osi_is_win8);
1693
1694 /*
1695 * Deallocate the memory for a spinlock.
1696 */
acpi_os_delete_lock(acpi_spinlock handle)1697 void acpi_os_delete_lock(acpi_spinlock handle)
1698 {
1699 ACPI_FREE(handle);
1700 }
1701
1702 /*
1703 * Acquire a spinlock.
1704 *
1705 * handle is a pointer to the spinlock_t.
1706 */
1707
acpi_os_acquire_lock(acpi_spinlock lockp)1708 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1709 {
1710 acpi_cpu_flags flags;
1711 spin_lock_irqsave(lockp, flags);
1712 return flags;
1713 }
1714
1715 /*
1716 * Release a spinlock. See above.
1717 */
1718
acpi_os_release_lock(acpi_spinlock lockp,acpi_cpu_flags flags)1719 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1720 {
1721 spin_unlock_irqrestore(lockp, flags);
1722 }
1723
1724 #ifndef ACPI_USE_LOCAL_CACHE
1725
1726 /*******************************************************************************
1727 *
1728 * FUNCTION: acpi_os_create_cache
1729 *
1730 * PARAMETERS: name - Ascii name for the cache
1731 * size - Size of each cached object
1732 * depth - Maximum depth of the cache (in objects) <ignored>
1733 * cache - Where the new cache object is returned
1734 *
1735 * RETURN: status
1736 *
1737 * DESCRIPTION: Create a cache object
1738 *
1739 ******************************************************************************/
1740
1741 acpi_status
acpi_os_create_cache(char * name,u16 size,u16 depth,acpi_cache_t ** cache)1742 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1743 {
1744 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1745 if (*cache == NULL)
1746 return AE_ERROR;
1747 else
1748 return AE_OK;
1749 }
1750
1751 /*******************************************************************************
1752 *
1753 * FUNCTION: acpi_os_purge_cache
1754 *
1755 * PARAMETERS: Cache - Handle to cache object
1756 *
1757 * RETURN: Status
1758 *
1759 * DESCRIPTION: Free all objects within the requested cache.
1760 *
1761 ******************************************************************************/
1762
acpi_os_purge_cache(acpi_cache_t * cache)1763 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1764 {
1765 kmem_cache_shrink(cache);
1766 return (AE_OK);
1767 }
1768
1769 /*******************************************************************************
1770 *
1771 * FUNCTION: acpi_os_delete_cache
1772 *
1773 * PARAMETERS: Cache - Handle to cache object
1774 *
1775 * RETURN: Status
1776 *
1777 * DESCRIPTION: Free all objects within the requested cache and delete the
1778 * cache object.
1779 *
1780 ******************************************************************************/
1781
acpi_os_delete_cache(acpi_cache_t * cache)1782 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1783 {
1784 kmem_cache_destroy(cache);
1785 return (AE_OK);
1786 }
1787
1788 /*******************************************************************************
1789 *
1790 * FUNCTION: acpi_os_release_object
1791 *
1792 * PARAMETERS: Cache - Handle to cache object
1793 * Object - The object to be released
1794 *
1795 * RETURN: None
1796 *
1797 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1798 * the object is deleted.
1799 *
1800 ******************************************************************************/
1801
acpi_os_release_object(acpi_cache_t * cache,void * object)1802 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1803 {
1804 kmem_cache_free(cache, object);
1805 return (AE_OK);
1806 }
1807 #endif
1808
acpi_no_static_ssdt_setup(char * s)1809 static int __init acpi_no_static_ssdt_setup(char *s)
1810 {
1811 acpi_gbl_disable_ssdt_table_install = TRUE;
1812 pr_info("ACPI: static SSDT installation disabled\n");
1813
1814 return 0;
1815 }
1816
1817 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1818
acpi_disable_return_repair(char * s)1819 static int __init acpi_disable_return_repair(char *s)
1820 {
1821 printk(KERN_NOTICE PREFIX
1822 "ACPI: Predefined validation mechanism disabled\n");
1823 acpi_gbl_disable_auto_repair = TRUE;
1824
1825 return 1;
1826 }
1827
1828 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1829
acpi_os_initialize(void)1830 acpi_status __init acpi_os_initialize(void)
1831 {
1832 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1833 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1834 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1835 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1836 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1837 /*
1838 * Use acpi_os_map_generic_address to pre-map the reset
1839 * register if it's in system memory.
1840 */
1841 int rv;
1842
1843 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1844 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1845 }
1846 acpi_os_initialized = true;
1847
1848 return AE_OK;
1849 }
1850
acpi_os_initialize1(void)1851 acpi_status __init acpi_os_initialize1(void)
1852 {
1853 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1854 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1855 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1856 BUG_ON(!kacpid_wq);
1857 BUG_ON(!kacpi_notify_wq);
1858 BUG_ON(!kacpi_hotplug_wq);
1859 acpi_install_interface_handler(acpi_osi_handler);
1860 acpi_osi_setup_late();
1861 return AE_OK;
1862 }
1863
acpi_os_terminate(void)1864 acpi_status acpi_os_terminate(void)
1865 {
1866 if (acpi_irq_handler) {
1867 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1868 acpi_irq_handler);
1869 }
1870
1871 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1872 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1873 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1874 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1875 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1876 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1877
1878 destroy_workqueue(kacpid_wq);
1879 destroy_workqueue(kacpi_notify_wq);
1880 destroy_workqueue(kacpi_hotplug_wq);
1881
1882 return AE_OK;
1883 }
1884
acpi_os_prepare_sleep(u8 sleep_state,u32 pm1a_control,u32 pm1b_control)1885 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1886 u32 pm1b_control)
1887 {
1888 int rc = 0;
1889 if (__acpi_os_prepare_sleep)
1890 rc = __acpi_os_prepare_sleep(sleep_state,
1891 pm1a_control, pm1b_control);
1892 if (rc < 0)
1893 return AE_ERROR;
1894 else if (rc > 0)
1895 return AE_CTRL_SKIP;
1896
1897 return AE_OK;
1898 }
1899
acpi_os_set_prepare_sleep(int (* func)(u8 sleep_state,u32 pm1a_ctrl,u32 pm1b_ctrl))1900 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1901 u32 pm1a_ctrl, u32 pm1b_ctrl))
1902 {
1903 __acpi_os_prepare_sleep = func;
1904 }
1905
acpi_os_prepare_extended_sleep(u8 sleep_state,u32 val_a,u32 val_b)1906 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1907 u32 val_b)
1908 {
1909 int rc = 0;
1910 if (__acpi_os_prepare_extended_sleep)
1911 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1912 val_a, val_b);
1913 if (rc < 0)
1914 return AE_ERROR;
1915 else if (rc > 0)
1916 return AE_CTRL_SKIP;
1917
1918 return AE_OK;
1919 }
1920
acpi_os_set_prepare_extended_sleep(int (* func)(u8 sleep_state,u32 val_a,u32 val_b))1921 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1922 u32 val_a, u32 val_b))
1923 {
1924 __acpi_os_prepare_extended_sleep = func;
1925 }
1926