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drm/i915/bdw: Reorganize PPGTT init
[deliverable/linux.git] / drivers / acpi / osl.c
1 /*
2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3 *
4 * Copyright (C) 2000 Andrew Henroid
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (c) 2008 Intel Corporation
8 * Author: Matthew Wilcox <willy@linux.intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/acpi_io.h>
43 #include <linux/efi.h>
44 #include <linux/ioport.h>
45 #include <linux/list.h>
46 #include <linux/jiffies.h>
47 #include <linux/semaphore.h>
48
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
55 #include "internal.h"
56
57 #define _COMPONENT ACPI_OS_SERVICES
58 ACPI_MODULE_NAME("osl");
59 #define PREFIX "ACPI: "
60 struct acpi_os_dpc {
61 acpi_osd_exec_callback function;
62 void *context;
63 struct work_struct work;
64 };
65
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
68 #endif
69
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
72
73 /* stuff for debugger support */
74 int acpi_in_debugger;
75 EXPORT_SYMBOL(acpi_in_debugger);
76
77 extern char line_buf[80];
78 #endif /*ENABLE_DEBUGGER */
79
80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81 u32 pm1b_ctrl);
82 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
83 u32 val_b);
84
85 static acpi_osd_handler acpi_irq_handler;
86 static void *acpi_irq_context;
87 static struct workqueue_struct *kacpid_wq;
88 static struct workqueue_struct *kacpi_notify_wq;
89 static struct workqueue_struct *kacpi_hotplug_wq;
90
91 /*
92 * This list of permanent mappings is for memory that may be accessed from
93 * interrupt context, where we can't do the ioremap().
94 */
95 struct acpi_ioremap {
96 struct list_head list;
97 void __iomem *virt;
98 acpi_physical_address phys;
99 acpi_size size;
100 unsigned long refcount;
101 };
102
103 static LIST_HEAD(acpi_ioremaps);
104 static DEFINE_MUTEX(acpi_ioremap_lock);
105
106 static void __init acpi_osi_setup_late(void);
107
108 /*
109 * The story of _OSI(Linux)
110 *
111 * From pre-history through Linux-2.6.22,
112 * Linux responded TRUE upon a BIOS OSI(Linux) query.
113 *
114 * Unfortunately, reference BIOS writers got wind of this
115 * and put OSI(Linux) in their example code, quickly exposing
116 * this string as ill-conceived and opening the door to
117 * an un-bounded number of BIOS incompatibilities.
118 *
119 * For example, OSI(Linux) was used on resume to re-POST a
120 * video card on one system, because Linux at that time
121 * could not do a speedy restore in its native driver.
122 * But then upon gaining quick native restore capability,
123 * Linux has no way to tell the BIOS to skip the time-consuming
124 * POST -- putting Linux at a permanent performance disadvantage.
125 * On another system, the BIOS writer used OSI(Linux)
126 * to infer native OS support for IPMI! On other systems,
127 * OSI(Linux) simply got in the way of Linux claiming to
128 * be compatible with other operating systems, exposing
129 * BIOS issues such as skipped device initialization.
130 *
131 * So "Linux" turned out to be a really poor chose of
132 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
133 *
134 * BIOS writers should NOT query _OSI(Linux) on future systems.
135 * Linux will complain on the console when it sees it, and return FALSE.
136 * To get Linux to return TRUE for your system will require
137 * a kernel source update to add a DMI entry,
138 * or boot with "acpi_osi=Linux"
139 */
140
141 static struct osi_linux {
142 unsigned int enable:1;
143 unsigned int dmi:1;
144 unsigned int cmdline:1;
145 unsigned int default_disabling:1;
146 } osi_linux = {0, 0, 0, 0};
147
148 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
149 {
150 if (!strcmp("Linux", interface)) {
151
152 printk_once(KERN_NOTICE FW_BUG PREFIX
153 "BIOS _OSI(Linux) query %s%s\n",
154 osi_linux.enable ? "honored" : "ignored",
155 osi_linux.cmdline ? " via cmdline" :
156 osi_linux.dmi ? " via DMI" : "");
157 }
158
159 return supported;
160 }
161
162 static void __init acpi_request_region (struct acpi_generic_address *gas,
163 unsigned int length, char *desc)
164 {
165 u64 addr;
166
167 /* Handle possible alignment issues */
168 memcpy(&addr, &gas->address, sizeof(addr));
169 if (!addr || !length)
170 return;
171
172 /* Resources are never freed */
173 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
174 request_region(addr, length, desc);
175 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
176 request_mem_region(addr, length, desc);
177 }
178
179 static int __init acpi_reserve_resources(void)
180 {
181 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
182 "ACPI PM1a_EVT_BLK");
183
184 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
185 "ACPI PM1b_EVT_BLK");
186
187 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
188 "ACPI PM1a_CNT_BLK");
189
190 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
191 "ACPI PM1b_CNT_BLK");
192
193 if (acpi_gbl_FADT.pm_timer_length == 4)
194 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
195
196 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
197 "ACPI PM2_CNT_BLK");
198
199 /* Length of GPE blocks must be a non-negative multiple of 2 */
200
201 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
202 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
203 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
204
205 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
206 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
207 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
208
209 return 0;
210 }
211 device_initcall(acpi_reserve_resources);
212
213 void acpi_os_printf(const char *fmt, ...)
214 {
215 va_list args;
216 va_start(args, fmt);
217 acpi_os_vprintf(fmt, args);
218 va_end(args);
219 }
220
221 void acpi_os_vprintf(const char *fmt, va_list args)
222 {
223 static char buffer[512];
224
225 vsprintf(buffer, fmt, args);
226
227 #ifdef ENABLE_DEBUGGER
228 if (acpi_in_debugger) {
229 kdb_printf("%s", buffer);
230 } else {
231 printk(KERN_CONT "%s", buffer);
232 }
233 #else
234 printk(KERN_CONT "%s", buffer);
235 #endif
236 }
237
238 #ifdef CONFIG_KEXEC
239 static unsigned long acpi_rsdp;
240 static int __init setup_acpi_rsdp(char *arg)
241 {
242 acpi_rsdp = simple_strtoul(arg, NULL, 16);
243 return 0;
244 }
245 early_param("acpi_rsdp", setup_acpi_rsdp);
246 #endif
247
248 acpi_physical_address __init acpi_os_get_root_pointer(void)
249 {
250 #ifdef CONFIG_KEXEC
251 if (acpi_rsdp)
252 return acpi_rsdp;
253 #endif
254
255 if (efi_enabled(EFI_CONFIG_TABLES)) {
256 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
257 return efi.acpi20;
258 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
259 return efi.acpi;
260 else {
261 printk(KERN_ERR PREFIX
262 "System description tables not found\n");
263 return 0;
264 }
265 } else {
266 acpi_physical_address pa = 0;
267
268 acpi_find_root_pointer(&pa);
269 return pa;
270 }
271 }
272
273 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
274 static struct acpi_ioremap *
275 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
276 {
277 struct acpi_ioremap *map;
278
279 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
280 if (map->phys <= phys &&
281 phys + size <= map->phys + map->size)
282 return map;
283
284 return NULL;
285 }
286
287 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
288 static void __iomem *
289 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
290 {
291 struct acpi_ioremap *map;
292
293 map = acpi_map_lookup(phys, size);
294 if (map)
295 return map->virt + (phys - map->phys);
296
297 return NULL;
298 }
299
300 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
301 {
302 struct acpi_ioremap *map;
303 void __iomem *virt = NULL;
304
305 mutex_lock(&acpi_ioremap_lock);
306 map = acpi_map_lookup(phys, size);
307 if (map) {
308 virt = map->virt + (phys - map->phys);
309 map->refcount++;
310 }
311 mutex_unlock(&acpi_ioremap_lock);
312 return virt;
313 }
314 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
315
316 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
317 static struct acpi_ioremap *
318 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
319 {
320 struct acpi_ioremap *map;
321
322 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
323 if (map->virt <= virt &&
324 virt + size <= map->virt + map->size)
325 return map;
326
327 return NULL;
328 }
329
330 #ifndef CONFIG_IA64
331 #define should_use_kmap(pfn) page_is_ram(pfn)
332 #else
333 /* ioremap will take care of cache attributes */
334 #define should_use_kmap(pfn) 0
335 #endif
336
337 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
338 {
339 unsigned long pfn;
340
341 pfn = pg_off >> PAGE_SHIFT;
342 if (should_use_kmap(pfn)) {
343 if (pg_sz > PAGE_SIZE)
344 return NULL;
345 return (void __iomem __force *)kmap(pfn_to_page(pfn));
346 } else
347 return acpi_os_ioremap(pg_off, pg_sz);
348 }
349
350 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
351 {
352 unsigned long pfn;
353
354 pfn = pg_off >> PAGE_SHIFT;
355 if (should_use_kmap(pfn))
356 kunmap(pfn_to_page(pfn));
357 else
358 iounmap(vaddr);
359 }
360
361 void __iomem *__init_refok
362 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
363 {
364 struct acpi_ioremap *map;
365 void __iomem *virt;
366 acpi_physical_address pg_off;
367 acpi_size pg_sz;
368
369 if (phys > ULONG_MAX) {
370 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
371 return NULL;
372 }
373
374 if (!acpi_gbl_permanent_mmap)
375 return __acpi_map_table((unsigned long)phys, size);
376
377 mutex_lock(&acpi_ioremap_lock);
378 /* Check if there's a suitable mapping already. */
379 map = acpi_map_lookup(phys, size);
380 if (map) {
381 map->refcount++;
382 goto out;
383 }
384
385 map = kzalloc(sizeof(*map), GFP_KERNEL);
386 if (!map) {
387 mutex_unlock(&acpi_ioremap_lock);
388 return NULL;
389 }
390
391 pg_off = round_down(phys, PAGE_SIZE);
392 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
393 virt = acpi_map(pg_off, pg_sz);
394 if (!virt) {
395 mutex_unlock(&acpi_ioremap_lock);
396 kfree(map);
397 return NULL;
398 }
399
400 INIT_LIST_HEAD(&map->list);
401 map->virt = virt;
402 map->phys = pg_off;
403 map->size = pg_sz;
404 map->refcount = 1;
405
406 list_add_tail_rcu(&map->list, &acpi_ioremaps);
407
408 out:
409 mutex_unlock(&acpi_ioremap_lock);
410 return map->virt + (phys - map->phys);
411 }
412 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
413
414 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
415 {
416 if (!--map->refcount)
417 list_del_rcu(&map->list);
418 }
419
420 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
421 {
422 if (!map->refcount) {
423 synchronize_rcu();
424 acpi_unmap(map->phys, map->virt);
425 kfree(map);
426 }
427 }
428
429 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
430 {
431 struct acpi_ioremap *map;
432
433 if (!acpi_gbl_permanent_mmap) {
434 __acpi_unmap_table(virt, size);
435 return;
436 }
437
438 mutex_lock(&acpi_ioremap_lock);
439 map = acpi_map_lookup_virt(virt, size);
440 if (!map) {
441 mutex_unlock(&acpi_ioremap_lock);
442 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
443 return;
444 }
445 acpi_os_drop_map_ref(map);
446 mutex_unlock(&acpi_ioremap_lock);
447
448 acpi_os_map_cleanup(map);
449 }
450 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
451
452 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
453 {
454 if (!acpi_gbl_permanent_mmap)
455 __acpi_unmap_table(virt, size);
456 }
457
458 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
459 {
460 u64 addr;
461 void __iomem *virt;
462
463 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
464 return 0;
465
466 /* Handle possible alignment issues */
467 memcpy(&addr, &gas->address, sizeof(addr));
468 if (!addr || !gas->bit_width)
469 return -EINVAL;
470
471 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
472 if (!virt)
473 return -EIO;
474
475 return 0;
476 }
477 EXPORT_SYMBOL(acpi_os_map_generic_address);
478
479 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
480 {
481 u64 addr;
482 struct acpi_ioremap *map;
483
484 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
485 return;
486
487 /* Handle possible alignment issues */
488 memcpy(&addr, &gas->address, sizeof(addr));
489 if (!addr || !gas->bit_width)
490 return;
491
492 mutex_lock(&acpi_ioremap_lock);
493 map = acpi_map_lookup(addr, gas->bit_width / 8);
494 if (!map) {
495 mutex_unlock(&acpi_ioremap_lock);
496 return;
497 }
498 acpi_os_drop_map_ref(map);
499 mutex_unlock(&acpi_ioremap_lock);
500
501 acpi_os_map_cleanup(map);
502 }
503 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
504
505 #ifdef ACPI_FUTURE_USAGE
506 acpi_status
507 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
508 {
509 if (!phys || !virt)
510 return AE_BAD_PARAMETER;
511
512 *phys = virt_to_phys(virt);
513
514 return AE_OK;
515 }
516 #endif
517
518 #define ACPI_MAX_OVERRIDE_LEN 100
519
520 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
521
522 acpi_status
523 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
524 acpi_string * new_val)
525 {
526 if (!init_val || !new_val)
527 return AE_BAD_PARAMETER;
528
529 *new_val = NULL;
530 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
531 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
532 acpi_os_name);
533 *new_val = acpi_os_name;
534 }
535
536 return AE_OK;
537 }
538
539 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
540 #include <linux/earlycpio.h>
541 #include <linux/memblock.h>
542
543 static u64 acpi_tables_addr;
544 static int all_tables_size;
545
546 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
547 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
548 {
549 u8 sum = 0;
550 u8 *end = buffer + length;
551
552 while (buffer < end)
553 sum = (u8) (sum + *(buffer++));
554 return sum;
555 }
556
557 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
558 static const char * const table_sigs[] = {
559 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
560 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
561 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
562 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
563 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
564 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
565 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
566 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
567 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
568
569 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
570
571 #define ACPI_OVERRIDE_TABLES 64
572 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
573
574 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
575
576 void __init acpi_initrd_override(void *data, size_t size)
577 {
578 int sig, no, table_nr = 0, total_offset = 0;
579 long offset = 0;
580 struct acpi_table_header *table;
581 char cpio_path[32] = "kernel/firmware/acpi/";
582 struct cpio_data file;
583
584 if (data == NULL || size == 0)
585 return;
586
587 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
588 file = find_cpio_data(cpio_path, data, size, &offset);
589 if (!file.data)
590 break;
591
592 data += offset;
593 size -= offset;
594
595 if (file.size < sizeof(struct acpi_table_header)) {
596 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
597 cpio_path, file.name);
598 continue;
599 }
600
601 table = file.data;
602
603 for (sig = 0; table_sigs[sig]; sig++)
604 if (!memcmp(table->signature, table_sigs[sig], 4))
605 break;
606
607 if (!table_sigs[sig]) {
608 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
609 cpio_path, file.name);
610 continue;
611 }
612 if (file.size != table->length) {
613 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
614 cpio_path, file.name);
615 continue;
616 }
617 if (acpi_table_checksum(file.data, table->length)) {
618 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
619 cpio_path, file.name);
620 continue;
621 }
622
623 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
624 table->signature, cpio_path, file.name, table->length);
625
626 all_tables_size += table->length;
627 acpi_initrd_files[table_nr].data = file.data;
628 acpi_initrd_files[table_nr].size = file.size;
629 table_nr++;
630 }
631 if (table_nr == 0)
632 return;
633
634 acpi_tables_addr =
635 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
636 all_tables_size, PAGE_SIZE);
637 if (!acpi_tables_addr) {
638 WARN_ON(1);
639 return;
640 }
641 /*
642 * Only calling e820_add_reserve does not work and the
643 * tables are invalid (memory got used) later.
644 * memblock_reserve works as expected and the tables won't get modified.
645 * But it's not enough on X86 because ioremap will
646 * complain later (used by acpi_os_map_memory) that the pages
647 * that should get mapped are not marked "reserved".
648 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
649 * works fine.
650 */
651 memblock_reserve(acpi_tables_addr, all_tables_size);
652 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
653
654 /*
655 * early_ioremap only can remap 256k one time. If we map all
656 * tables one time, we will hit the limit. Need to map chunks
657 * one by one during copying the same as that in relocate_initrd().
658 */
659 for (no = 0; no < table_nr; no++) {
660 unsigned char *src_p = acpi_initrd_files[no].data;
661 phys_addr_t size = acpi_initrd_files[no].size;
662 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
663 phys_addr_t slop, clen;
664 char *dest_p;
665
666 total_offset += size;
667
668 while (size) {
669 slop = dest_addr & ~PAGE_MASK;
670 clen = size;
671 if (clen > MAP_CHUNK_SIZE - slop)
672 clen = MAP_CHUNK_SIZE - slop;
673 dest_p = early_ioremap(dest_addr & PAGE_MASK,
674 clen + slop);
675 memcpy(dest_p + slop, src_p, clen);
676 early_iounmap(dest_p, clen + slop);
677 src_p += clen;
678 dest_addr += clen;
679 size -= clen;
680 }
681 }
682 }
683 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
684
685 static void acpi_table_taint(struct acpi_table_header *table)
686 {
687 pr_warn(PREFIX
688 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
689 table->signature, table->oem_table_id);
690 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
691 }
692
693
694 acpi_status
695 acpi_os_table_override(struct acpi_table_header * existing_table,
696 struct acpi_table_header ** new_table)
697 {
698 if (!existing_table || !new_table)
699 return AE_BAD_PARAMETER;
700
701 *new_table = NULL;
702
703 #ifdef CONFIG_ACPI_CUSTOM_DSDT
704 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
705 *new_table = (struct acpi_table_header *)AmlCode;
706 #endif
707 if (*new_table != NULL)
708 acpi_table_taint(existing_table);
709 return AE_OK;
710 }
711
712 acpi_status
713 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
714 acpi_physical_address *address,
715 u32 *table_length)
716 {
717 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
718 *table_length = 0;
719 *address = 0;
720 return AE_OK;
721 #else
722 int table_offset = 0;
723 struct acpi_table_header *table;
724
725 *table_length = 0;
726 *address = 0;
727
728 if (!acpi_tables_addr)
729 return AE_OK;
730
731 do {
732 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
733 WARN_ON(1);
734 return AE_OK;
735 }
736
737 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
738 ACPI_HEADER_SIZE);
739
740 if (table_offset + table->length > all_tables_size) {
741 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
742 WARN_ON(1);
743 return AE_OK;
744 }
745
746 table_offset += table->length;
747
748 if (memcmp(existing_table->signature, table->signature, 4)) {
749 acpi_os_unmap_memory(table,
750 ACPI_HEADER_SIZE);
751 continue;
752 }
753
754 /* Only override tables with matching oem id */
755 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
756 ACPI_OEM_TABLE_ID_SIZE)) {
757 acpi_os_unmap_memory(table,
758 ACPI_HEADER_SIZE);
759 continue;
760 }
761
762 table_offset -= table->length;
763 *table_length = table->length;
764 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
765 *address = acpi_tables_addr + table_offset;
766 break;
767 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
768
769 if (*address != 0)
770 acpi_table_taint(existing_table);
771 return AE_OK;
772 #endif
773 }
774
775 static irqreturn_t acpi_irq(int irq, void *dev_id)
776 {
777 u32 handled;
778
779 handled = (*acpi_irq_handler) (acpi_irq_context);
780
781 if (handled) {
782 acpi_irq_handled++;
783 return IRQ_HANDLED;
784 } else {
785 acpi_irq_not_handled++;
786 return IRQ_NONE;
787 }
788 }
789
790 acpi_status
791 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
792 void *context)
793 {
794 unsigned int irq;
795
796 acpi_irq_stats_init();
797
798 /*
799 * ACPI interrupts different from the SCI in our copy of the FADT are
800 * not supported.
801 */
802 if (gsi != acpi_gbl_FADT.sci_interrupt)
803 return AE_BAD_PARAMETER;
804
805 if (acpi_irq_handler)
806 return AE_ALREADY_ACQUIRED;
807
808 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
809 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
810 gsi);
811 return AE_OK;
812 }
813
814 acpi_irq_handler = handler;
815 acpi_irq_context = context;
816 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
817 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
818 acpi_irq_handler = NULL;
819 return AE_NOT_ACQUIRED;
820 }
821
822 return AE_OK;
823 }
824
825 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
826 {
827 if (irq != acpi_gbl_FADT.sci_interrupt)
828 return AE_BAD_PARAMETER;
829
830 free_irq(irq, acpi_irq);
831 acpi_irq_handler = NULL;
832
833 return AE_OK;
834 }
835
836 /*
837 * Running in interpreter thread context, safe to sleep
838 */
839
840 void acpi_os_sleep(u64 ms)
841 {
842 msleep(ms);
843 }
844
845 void acpi_os_stall(u32 us)
846 {
847 while (us) {
848 u32 delay = 1000;
849
850 if (delay > us)
851 delay = us;
852 udelay(delay);
853 touch_nmi_watchdog();
854 us -= delay;
855 }
856 }
857
858 /*
859 * Support ACPI 3.0 AML Timer operand
860 * Returns 64-bit free-running, monotonically increasing timer
861 * with 100ns granularity
862 */
863 u64 acpi_os_get_timer(void)
864 {
865 u64 time_ns = ktime_to_ns(ktime_get());
866 do_div(time_ns, 100);
867 return time_ns;
868 }
869
870 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
871 {
872 u32 dummy;
873
874 if (!value)
875 value = &dummy;
876
877 *value = 0;
878 if (width <= 8) {
879 *(u8 *) value = inb(port);
880 } else if (width <= 16) {
881 *(u16 *) value = inw(port);
882 } else if (width <= 32) {
883 *(u32 *) value = inl(port);
884 } else {
885 BUG();
886 }
887
888 return AE_OK;
889 }
890
891 EXPORT_SYMBOL(acpi_os_read_port);
892
893 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
894 {
895 if (width <= 8) {
896 outb(value, port);
897 } else if (width <= 16) {
898 outw(value, port);
899 } else if (width <= 32) {
900 outl(value, port);
901 } else {
902 BUG();
903 }
904
905 return AE_OK;
906 }
907
908 EXPORT_SYMBOL(acpi_os_write_port);
909
910 #ifdef readq
911 static inline u64 read64(const volatile void __iomem *addr)
912 {
913 return readq(addr);
914 }
915 #else
916 static inline u64 read64(const volatile void __iomem *addr)
917 {
918 u64 l, h;
919 l = readl(addr);
920 h = readl(addr+4);
921 return l | (h << 32);
922 }
923 #endif
924
925 acpi_status
926 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
927 {
928 void __iomem *virt_addr;
929 unsigned int size = width / 8;
930 bool unmap = false;
931 u64 dummy;
932
933 rcu_read_lock();
934 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
935 if (!virt_addr) {
936 rcu_read_unlock();
937 virt_addr = acpi_os_ioremap(phys_addr, size);
938 if (!virt_addr)
939 return AE_BAD_ADDRESS;
940 unmap = true;
941 }
942
943 if (!value)
944 value = &dummy;
945
946 switch (width) {
947 case 8:
948 *(u8 *) value = readb(virt_addr);
949 break;
950 case 16:
951 *(u16 *) value = readw(virt_addr);
952 break;
953 case 32:
954 *(u32 *) value = readl(virt_addr);
955 break;
956 case 64:
957 *(u64 *) value = read64(virt_addr);
958 break;
959 default:
960 BUG();
961 }
962
963 if (unmap)
964 iounmap(virt_addr);
965 else
966 rcu_read_unlock();
967
968 return AE_OK;
969 }
970
971 #ifdef writeq
972 static inline void write64(u64 val, volatile void __iomem *addr)
973 {
974 writeq(val, addr);
975 }
976 #else
977 static inline void write64(u64 val, volatile void __iomem *addr)
978 {
979 writel(val, addr);
980 writel(val>>32, addr+4);
981 }
982 #endif
983
984 acpi_status
985 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
986 {
987 void __iomem *virt_addr;
988 unsigned int size = width / 8;
989 bool unmap = false;
990
991 rcu_read_lock();
992 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
993 if (!virt_addr) {
994 rcu_read_unlock();
995 virt_addr = acpi_os_ioremap(phys_addr, size);
996 if (!virt_addr)
997 return AE_BAD_ADDRESS;
998 unmap = true;
999 }
1000
1001 switch (width) {
1002 case 8:
1003 writeb(value, virt_addr);
1004 break;
1005 case 16:
1006 writew(value, virt_addr);
1007 break;
1008 case 32:
1009 writel(value, virt_addr);
1010 break;
1011 case 64:
1012 write64(value, virt_addr);
1013 break;
1014 default:
1015 BUG();
1016 }
1017
1018 if (unmap)
1019 iounmap(virt_addr);
1020 else
1021 rcu_read_unlock();
1022
1023 return AE_OK;
1024 }
1025
1026 acpi_status
1027 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1028 u64 *value, u32 width)
1029 {
1030 int result, size;
1031 u32 value32;
1032
1033 if (!value)
1034 return AE_BAD_PARAMETER;
1035
1036 switch (width) {
1037 case 8:
1038 size = 1;
1039 break;
1040 case 16:
1041 size = 2;
1042 break;
1043 case 32:
1044 size = 4;
1045 break;
1046 default:
1047 return AE_ERROR;
1048 }
1049
1050 result = raw_pci_read(pci_id->segment, pci_id->bus,
1051 PCI_DEVFN(pci_id->device, pci_id->function),
1052 reg, size, &value32);
1053 *value = value32;
1054
1055 return (result ? AE_ERROR : AE_OK);
1056 }
1057
1058 acpi_status
1059 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1060 u64 value, u32 width)
1061 {
1062 int result, size;
1063
1064 switch (width) {
1065 case 8:
1066 size = 1;
1067 break;
1068 case 16:
1069 size = 2;
1070 break;
1071 case 32:
1072 size = 4;
1073 break;
1074 default:
1075 return AE_ERROR;
1076 }
1077
1078 result = raw_pci_write(pci_id->segment, pci_id->bus,
1079 PCI_DEVFN(pci_id->device, pci_id->function),
1080 reg, size, value);
1081
1082 return (result ? AE_ERROR : AE_OK);
1083 }
1084
1085 static void acpi_os_execute_deferred(struct work_struct *work)
1086 {
1087 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1088
1089 dpc->function(dpc->context);
1090 kfree(dpc);
1091 }
1092
1093 /*******************************************************************************
1094 *
1095 * FUNCTION: acpi_os_execute
1096 *
1097 * PARAMETERS: Type - Type of the callback
1098 * Function - Function to be executed
1099 * Context - Function parameters
1100 *
1101 * RETURN: Status
1102 *
1103 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1104 * immediately executes function on a separate thread.
1105 *
1106 ******************************************************************************/
1107
1108 acpi_status acpi_os_execute(acpi_execute_type type,
1109 acpi_osd_exec_callback function, void *context)
1110 {
1111 acpi_status status = AE_OK;
1112 struct acpi_os_dpc *dpc;
1113 struct workqueue_struct *queue;
1114 int ret;
1115 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1116 "Scheduling function [%p(%p)] for deferred execution.\n",
1117 function, context));
1118
1119 /*
1120 * Allocate/initialize DPC structure. Note that this memory will be
1121 * freed by the callee. The kernel handles the work_struct list in a
1122 * way that allows us to also free its memory inside the callee.
1123 * Because we may want to schedule several tasks with different
1124 * parameters we can't use the approach some kernel code uses of
1125 * having a static work_struct.
1126 */
1127
1128 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1129 if (!dpc)
1130 return AE_NO_MEMORY;
1131
1132 dpc->function = function;
1133 dpc->context = context;
1134
1135 /*
1136 * To prevent lockdep from complaining unnecessarily, make sure that
1137 * there is a different static lockdep key for each workqueue by using
1138 * INIT_WORK() for each of them separately.
1139 */
1140 if (type == OSL_NOTIFY_HANDLER) {
1141 queue = kacpi_notify_wq;
1142 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1143 } else {
1144 queue = kacpid_wq;
1145 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1146 }
1147
1148 /*
1149 * On some machines, a software-initiated SMI causes corruption unless
1150 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1151 * typically it's done in GPE-related methods that are run via
1152 * workqueues, so we can avoid the known corruption cases by always
1153 * queueing on CPU 0.
1154 */
1155 ret = queue_work_on(0, queue, &dpc->work);
1156
1157 if (!ret) {
1158 printk(KERN_ERR PREFIX
1159 "Call to queue_work() failed.\n");
1160 status = AE_ERROR;
1161 kfree(dpc);
1162 }
1163 return status;
1164 }
1165 EXPORT_SYMBOL(acpi_os_execute);
1166
1167 void acpi_os_wait_events_complete(void)
1168 {
1169 flush_workqueue(kacpid_wq);
1170 flush_workqueue(kacpi_notify_wq);
1171 }
1172
1173 struct acpi_hp_work {
1174 struct work_struct work;
1175 acpi_hp_callback func;
1176 void *data;
1177 u32 src;
1178 };
1179
1180 static void acpi_hotplug_work_fn(struct work_struct *work)
1181 {
1182 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1183
1184 acpi_os_wait_events_complete();
1185 hpw->func(hpw->data, hpw->src);
1186 kfree(hpw);
1187 }
1188
1189 acpi_status acpi_hotplug_execute(acpi_hp_callback func, void *data, u32 src)
1190 {
1191 struct acpi_hp_work *hpw;
1192
1193 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1194 "Scheduling function [%p(%p, %u)] for deferred execution.\n",
1195 func, data, src));
1196
1197 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1198 if (!hpw)
1199 return AE_NO_MEMORY;
1200
1201 INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1202 hpw->func = func;
1203 hpw->data = data;
1204 hpw->src = src;
1205 /*
1206 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1207 * the hotplug code may call driver .remove() functions, which may
1208 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1209 * these workqueues.
1210 */
1211 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1212 kfree(hpw);
1213 return AE_ERROR;
1214 }
1215 return AE_OK;
1216 }
1217
1218
1219 acpi_status
1220 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1221 {
1222 struct semaphore *sem = NULL;
1223
1224 sem = acpi_os_allocate(sizeof(struct semaphore));
1225 if (!sem)
1226 return AE_NO_MEMORY;
1227 memset(sem, 0, sizeof(struct semaphore));
1228
1229 sema_init(sem, initial_units);
1230
1231 *handle = (acpi_handle *) sem;
1232
1233 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1234 *handle, initial_units));
1235
1236 return AE_OK;
1237 }
1238
1239 /*
1240 * TODO: A better way to delete semaphores? Linux doesn't have a
1241 * 'delete_semaphore()' function -- may result in an invalid
1242 * pointer dereference for non-synchronized consumers. Should
1243 * we at least check for blocked threads and signal/cancel them?
1244 */
1245
1246 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1247 {
1248 struct semaphore *sem = (struct semaphore *)handle;
1249
1250 if (!sem)
1251 return AE_BAD_PARAMETER;
1252
1253 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1254
1255 BUG_ON(!list_empty(&sem->wait_list));
1256 kfree(sem);
1257 sem = NULL;
1258
1259 return AE_OK;
1260 }
1261
1262 /*
1263 * TODO: Support for units > 1?
1264 */
1265 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1266 {
1267 acpi_status status = AE_OK;
1268 struct semaphore *sem = (struct semaphore *)handle;
1269 long jiffies;
1270 int ret = 0;
1271
1272 if (!sem || (units < 1))
1273 return AE_BAD_PARAMETER;
1274
1275 if (units > 1)
1276 return AE_SUPPORT;
1277
1278 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1279 handle, units, timeout));
1280
1281 if (timeout == ACPI_WAIT_FOREVER)
1282 jiffies = MAX_SCHEDULE_TIMEOUT;
1283 else
1284 jiffies = msecs_to_jiffies(timeout);
1285
1286 ret = down_timeout(sem, jiffies);
1287 if (ret)
1288 status = AE_TIME;
1289
1290 if (ACPI_FAILURE(status)) {
1291 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1292 "Failed to acquire semaphore[%p|%d|%d], %s",
1293 handle, units, timeout,
1294 acpi_format_exception(status)));
1295 } else {
1296 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1297 "Acquired semaphore[%p|%d|%d]", handle,
1298 units, timeout));
1299 }
1300
1301 return status;
1302 }
1303
1304 /*
1305 * TODO: Support for units > 1?
1306 */
1307 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1308 {
1309 struct semaphore *sem = (struct semaphore *)handle;
1310
1311 if (!sem || (units < 1))
1312 return AE_BAD_PARAMETER;
1313
1314 if (units > 1)
1315 return AE_SUPPORT;
1316
1317 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1318 units));
1319
1320 up(sem);
1321
1322 return AE_OK;
1323 }
1324
1325 #ifdef ACPI_FUTURE_USAGE
1326 u32 acpi_os_get_line(char *buffer)
1327 {
1328
1329 #ifdef ENABLE_DEBUGGER
1330 if (acpi_in_debugger) {
1331 u32 chars;
1332
1333 kdb_read(buffer, sizeof(line_buf));
1334
1335 /* remove the CR kdb includes */
1336 chars = strlen(buffer) - 1;
1337 buffer[chars] = '\0';
1338 }
1339 #endif
1340
1341 return 0;
1342 }
1343 #endif /* ACPI_FUTURE_USAGE */
1344
1345 acpi_status acpi_os_signal(u32 function, void *info)
1346 {
1347 switch (function) {
1348 case ACPI_SIGNAL_FATAL:
1349 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1350 break;
1351 case ACPI_SIGNAL_BREAKPOINT:
1352 /*
1353 * AML Breakpoint
1354 * ACPI spec. says to treat it as a NOP unless
1355 * you are debugging. So if/when we integrate
1356 * AML debugger into the kernel debugger its
1357 * hook will go here. But until then it is
1358 * not useful to print anything on breakpoints.
1359 */
1360 break;
1361 default:
1362 break;
1363 }
1364
1365 return AE_OK;
1366 }
1367
1368 static int __init acpi_os_name_setup(char *str)
1369 {
1370 char *p = acpi_os_name;
1371 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1372
1373 if (!str || !*str)
1374 return 0;
1375
1376 for (; count-- && *str; str++) {
1377 if (isalnum(*str) || *str == ' ' || *str == ':')
1378 *p++ = *str;
1379 else if (*str == '\'' || *str == '"')
1380 continue;
1381 else
1382 break;
1383 }
1384 *p = 0;
1385
1386 return 1;
1387
1388 }
1389
1390 __setup("acpi_os_name=", acpi_os_name_setup);
1391
1392 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1393 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1394
1395 struct osi_setup_entry {
1396 char string[OSI_STRING_LENGTH_MAX];
1397 bool enable;
1398 };
1399
1400 static struct osi_setup_entry
1401 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1402 {"Module Device", true},
1403 {"Processor Device", true},
1404 {"3.0 _SCP Extensions", true},
1405 {"Processor Aggregator Device", true},
1406 };
1407
1408 void __init acpi_osi_setup(char *str)
1409 {
1410 struct osi_setup_entry *osi;
1411 bool enable = true;
1412 int i;
1413
1414 if (!acpi_gbl_create_osi_method)
1415 return;
1416
1417 if (str == NULL || *str == '\0') {
1418 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1419 acpi_gbl_create_osi_method = FALSE;
1420 return;
1421 }
1422
1423 if (*str == '!') {
1424 str++;
1425 if (*str == '\0') {
1426 osi_linux.default_disabling = 1;
1427 return;
1428 } else if (*str == '*') {
1429 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1430 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1431 osi = &osi_setup_entries[i];
1432 osi->enable = false;
1433 }
1434 return;
1435 }
1436 enable = false;
1437 }
1438
1439 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1440 osi = &osi_setup_entries[i];
1441 if (!strcmp(osi->string, str)) {
1442 osi->enable = enable;
1443 break;
1444 } else if (osi->string[0] == '\0') {
1445 osi->enable = enable;
1446 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1447 break;
1448 }
1449 }
1450 }
1451
1452 static void __init set_osi_linux(unsigned int enable)
1453 {
1454 if (osi_linux.enable != enable)
1455 osi_linux.enable = enable;
1456
1457 if (osi_linux.enable)
1458 acpi_osi_setup("Linux");
1459 else
1460 acpi_osi_setup("!Linux");
1461
1462 return;
1463 }
1464
1465 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1466 {
1467 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1468 osi_linux.dmi = 0;
1469 set_osi_linux(enable);
1470
1471 return;
1472 }
1473
1474 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1475 {
1476 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1477
1478 if (enable == -1)
1479 return;
1480
1481 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1482 set_osi_linux(enable);
1483
1484 return;
1485 }
1486
1487 /*
1488 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1489 *
1490 * empty string disables _OSI
1491 * string starting with '!' disables that string
1492 * otherwise string is added to list, augmenting built-in strings
1493 */
1494 static void __init acpi_osi_setup_late(void)
1495 {
1496 struct osi_setup_entry *osi;
1497 char *str;
1498 int i;
1499 acpi_status status;
1500
1501 if (osi_linux.default_disabling) {
1502 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1503
1504 if (ACPI_SUCCESS(status))
1505 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1506 }
1507
1508 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1509 osi = &osi_setup_entries[i];
1510 str = osi->string;
1511
1512 if (*str == '\0')
1513 break;
1514 if (osi->enable) {
1515 status = acpi_install_interface(str);
1516
1517 if (ACPI_SUCCESS(status))
1518 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1519 } else {
1520 status = acpi_remove_interface(str);
1521
1522 if (ACPI_SUCCESS(status))
1523 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1524 }
1525 }
1526 }
1527
1528 static int __init osi_setup(char *str)
1529 {
1530 if (str && !strcmp("Linux", str))
1531 acpi_cmdline_osi_linux(1);
1532 else if (str && !strcmp("!Linux", str))
1533 acpi_cmdline_osi_linux(0);
1534 else
1535 acpi_osi_setup(str);
1536
1537 return 1;
1538 }
1539
1540 __setup("acpi_osi=", osi_setup);
1541
1542 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1543 static int __init acpi_serialize_setup(char *str)
1544 {
1545 printk(KERN_INFO PREFIX "serialize enabled\n");
1546
1547 acpi_gbl_all_methods_serialized = TRUE;
1548
1549 return 1;
1550 }
1551
1552 __setup("acpi_serialize", acpi_serialize_setup);
1553
1554 /* Check of resource interference between native drivers and ACPI
1555 * OperationRegions (SystemIO and System Memory only).
1556 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1557 * in arbitrary AML code and can interfere with legacy drivers.
1558 * acpi_enforce_resources= can be set to:
1559 *
1560 * - strict (default) (2)
1561 * -> further driver trying to access the resources will not load
1562 * - lax (1)
1563 * -> further driver trying to access the resources will load, but you
1564 * get a system message that something might go wrong...
1565 *
1566 * - no (0)
1567 * -> ACPI Operation Region resources will not be registered
1568 *
1569 */
1570 #define ENFORCE_RESOURCES_STRICT 2
1571 #define ENFORCE_RESOURCES_LAX 1
1572 #define ENFORCE_RESOURCES_NO 0
1573
1574 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1575
1576 static int __init acpi_enforce_resources_setup(char *str)
1577 {
1578 if (str == NULL || *str == '\0')
1579 return 0;
1580
1581 if (!strcmp("strict", str))
1582 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1583 else if (!strcmp("lax", str))
1584 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1585 else if (!strcmp("no", str))
1586 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1587
1588 return 1;
1589 }
1590
1591 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1592
1593 /* Check for resource conflicts between ACPI OperationRegions and native
1594 * drivers */
1595 int acpi_check_resource_conflict(const struct resource *res)
1596 {
1597 acpi_adr_space_type space_id;
1598 acpi_size length;
1599 u8 warn = 0;
1600 int clash = 0;
1601
1602 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1603 return 0;
1604 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1605 return 0;
1606
1607 if (res->flags & IORESOURCE_IO)
1608 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1609 else
1610 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1611
1612 length = resource_size(res);
1613 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1614 warn = 1;
1615 clash = acpi_check_address_range(space_id, res->start, length, warn);
1616
1617 if (clash) {
1618 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1619 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1620 printk(KERN_NOTICE "ACPI: This conflict may"
1621 " cause random problems and system"
1622 " instability\n");
1623 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1624 " for this device, you should use it instead of"
1625 " the native driver\n");
1626 }
1627 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1628 return -EBUSY;
1629 }
1630 return 0;
1631 }
1632 EXPORT_SYMBOL(acpi_check_resource_conflict);
1633
1634 int acpi_check_region(resource_size_t start, resource_size_t n,
1635 const char *name)
1636 {
1637 struct resource res = {
1638 .start = start,
1639 .end = start + n - 1,
1640 .name = name,
1641 .flags = IORESOURCE_IO,
1642 };
1643
1644 return acpi_check_resource_conflict(&res);
1645 }
1646 EXPORT_SYMBOL(acpi_check_region);
1647
1648 /*
1649 * Let drivers know whether the resource checks are effective
1650 */
1651 int acpi_resources_are_enforced(void)
1652 {
1653 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1654 }
1655 EXPORT_SYMBOL(acpi_resources_are_enforced);
1656
1657 /*
1658 * Deallocate the memory for a spinlock.
1659 */
1660 void acpi_os_delete_lock(acpi_spinlock handle)
1661 {
1662 ACPI_FREE(handle);
1663 }
1664
1665 /*
1666 * Acquire a spinlock.
1667 *
1668 * handle is a pointer to the spinlock_t.
1669 */
1670
1671 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1672 {
1673 acpi_cpu_flags flags;
1674 spin_lock_irqsave(lockp, flags);
1675 return flags;
1676 }
1677
1678 /*
1679 * Release a spinlock. See above.
1680 */
1681
1682 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1683 {
1684 spin_unlock_irqrestore(lockp, flags);
1685 }
1686
1687 #ifndef ACPI_USE_LOCAL_CACHE
1688
1689 /*******************************************************************************
1690 *
1691 * FUNCTION: acpi_os_create_cache
1692 *
1693 * PARAMETERS: name - Ascii name for the cache
1694 * size - Size of each cached object
1695 * depth - Maximum depth of the cache (in objects) <ignored>
1696 * cache - Where the new cache object is returned
1697 *
1698 * RETURN: status
1699 *
1700 * DESCRIPTION: Create a cache object
1701 *
1702 ******************************************************************************/
1703
1704 acpi_status
1705 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1706 {
1707 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1708 if (*cache == NULL)
1709 return AE_ERROR;
1710 else
1711 return AE_OK;
1712 }
1713
1714 /*******************************************************************************
1715 *
1716 * FUNCTION: acpi_os_purge_cache
1717 *
1718 * PARAMETERS: Cache - Handle to cache object
1719 *
1720 * RETURN: Status
1721 *
1722 * DESCRIPTION: Free all objects within the requested cache.
1723 *
1724 ******************************************************************************/
1725
1726 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1727 {
1728 kmem_cache_shrink(cache);
1729 return (AE_OK);
1730 }
1731
1732 /*******************************************************************************
1733 *
1734 * FUNCTION: acpi_os_delete_cache
1735 *
1736 * PARAMETERS: Cache - Handle to cache object
1737 *
1738 * RETURN: Status
1739 *
1740 * DESCRIPTION: Free all objects within the requested cache and delete the
1741 * cache object.
1742 *
1743 ******************************************************************************/
1744
1745 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1746 {
1747 kmem_cache_destroy(cache);
1748 return (AE_OK);
1749 }
1750
1751 /*******************************************************************************
1752 *
1753 * FUNCTION: acpi_os_release_object
1754 *
1755 * PARAMETERS: Cache - Handle to cache object
1756 * Object - The object to be released
1757 *
1758 * RETURN: None
1759 *
1760 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1761 * the object is deleted.
1762 *
1763 ******************************************************************************/
1764
1765 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1766 {
1767 kmem_cache_free(cache, object);
1768 return (AE_OK);
1769 }
1770 #endif
1771
1772 static int __init acpi_no_auto_ssdt_setup(char *s)
1773 {
1774 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1775
1776 acpi_gbl_disable_ssdt_table_load = TRUE;
1777
1778 return 1;
1779 }
1780
1781 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1782
1783 acpi_status __init acpi_os_initialize(void)
1784 {
1785 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1786 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1787 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1788 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1789
1790 return AE_OK;
1791 }
1792
1793 acpi_status __init acpi_os_initialize1(void)
1794 {
1795 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1796 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1797 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1798 BUG_ON(!kacpid_wq);
1799 BUG_ON(!kacpi_notify_wq);
1800 BUG_ON(!kacpi_hotplug_wq);
1801 acpi_install_interface_handler(acpi_osi_handler);
1802 acpi_osi_setup_late();
1803 return AE_OK;
1804 }
1805
1806 acpi_status acpi_os_terminate(void)
1807 {
1808 if (acpi_irq_handler) {
1809 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1810 acpi_irq_handler);
1811 }
1812
1813 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1814 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1815 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1816 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1817
1818 destroy_workqueue(kacpid_wq);
1819 destroy_workqueue(kacpi_notify_wq);
1820 destroy_workqueue(kacpi_hotplug_wq);
1821
1822 return AE_OK;
1823 }
1824
1825 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1826 u32 pm1b_control)
1827 {
1828 int rc = 0;
1829 if (__acpi_os_prepare_sleep)
1830 rc = __acpi_os_prepare_sleep(sleep_state,
1831 pm1a_control, pm1b_control);
1832 if (rc < 0)
1833 return AE_ERROR;
1834 else if (rc > 0)
1835 return AE_CTRL_SKIP;
1836
1837 return AE_OK;
1838 }
1839
1840 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1841 u32 pm1a_ctrl, u32 pm1b_ctrl))
1842 {
1843 __acpi_os_prepare_sleep = func;
1844 }
1845
1846 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1847 u32 val_b)
1848 {
1849 int rc = 0;
1850 if (__acpi_os_prepare_extended_sleep)
1851 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1852 val_a, val_b);
1853 if (rc < 0)
1854 return AE_ERROR;
1855 else if (rc > 0)
1856 return AE_CTRL_SKIP;
1857
1858 return AE_OK;
1859 }
1860
1861 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1862 u32 val_a, u32 val_b))
1863 {
1864 __acpi_os_prepare_extended_sleep = func;
1865 }
Linux kernel - Deliverables
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