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1/*
2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/kernel.h>
29#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
32#include <linux/device.h>
33#include <linux/proc_fs.h>
34#include <linux/acpi.h>
35#include <linux/slab.h>
36#ifdef CONFIG_X86
37#include <asm/mpspec.h>
38#endif
39#include <linux/pci.h>
40#include <acpi/acpi_bus.h>
41#include <acpi/acpi_drivers.h>
42#include <acpi/apei.h>
43#include <linux/dmi.h>
44#include <linux/suspend.h>
45
46#include "internal.h"
47
48#define _COMPONENT ACPI_BUS_COMPONENT
49ACPI_MODULE_NAME("bus");
50
51struct acpi_device *acpi_root;
52struct proc_dir_entry *acpi_root_dir;
53EXPORT_SYMBOL(acpi_root_dir);
54
55#define STRUCT_TO_INT(s) (*((int*)&s))
56
57
58#ifdef CONFIG_X86
59static int set_copy_dsdt(const struct dmi_system_id *id)
60{
61 printk(KERN_NOTICE "%s detected - "
62 "force copy of DSDT to local memory\n", id->ident);
63 acpi_gbl_copy_dsdt_locally = 1;
64 return 0;
65}
66
67static struct dmi_system_id dsdt_dmi_table[] __initdata = {
68 /*
69 * Invoke DSDT corruption work-around on all Toshiba Satellite.
70 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
71 */
72 {
73 .callback = set_copy_dsdt,
74 .ident = "TOSHIBA Satellite",
75 .matches = {
76 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
77 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
78 },
79 },
80 {}
81};
82#else
83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
84 {}
85};
86#endif
87
88/* --------------------------------------------------------------------------
89 Device Management
90 -------------------------------------------------------------------------- */
91
92int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
93{
94 acpi_status status = AE_OK;
95
96
97 if (!device)
98 return -EINVAL;
99
100 /* TBD: Support fixed-feature devices */
101
102 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
103 if (ACPI_FAILURE(status) || !*device) {
104 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
105 handle));
106 return -ENODEV;
107 }
108
109 return 0;
110}
111
112EXPORT_SYMBOL(acpi_bus_get_device);
113
114acpi_status acpi_bus_get_status_handle(acpi_handle handle,
115 unsigned long long *sta)
116{
117 acpi_status status;
118
119 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
120 if (ACPI_SUCCESS(status))
121 return AE_OK;
122
123 if (status == AE_NOT_FOUND) {
124 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
125 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
126 return AE_OK;
127 }
128 return status;
129}
130
131int acpi_bus_get_status(struct acpi_device *device)
132{
133 acpi_status status;
134 unsigned long long sta;
135
136 status = acpi_bus_get_status_handle(device->handle, &sta);
137 if (ACPI_FAILURE(status))
138 return -ENODEV;
139
140 STRUCT_TO_INT(device->status) = (int) sta;
141
142 if (device->status.functional && !device->status.present) {
143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
144 "functional but not present;\n",
145 device->pnp.bus_id,
146 (u32) STRUCT_TO_INT(device->status)));
147 }
148
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
150 device->pnp.bus_id,
151 (u32) STRUCT_TO_INT(device->status)));
152 return 0;
153}
154EXPORT_SYMBOL(acpi_bus_get_status);
155
156void acpi_bus_private_data_handler(acpi_handle handle,
157 void *context)
158{
159 return;
160}
161EXPORT_SYMBOL(acpi_bus_private_data_handler);
162
163int acpi_bus_get_private_data(acpi_handle handle, void **data)
164{
165 acpi_status status = AE_OK;
166
167 if (!*data)
168 return -EINVAL;
169
170 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
171 if (ACPI_FAILURE(status) || !*data) {
172 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
173 handle));
174 return -ENODEV;
175 }
176
177 return 0;
178}
179EXPORT_SYMBOL(acpi_bus_get_private_data);
180
181/* --------------------------------------------------------------------------
182 Power Management
183 -------------------------------------------------------------------------- */
184
185static int __acpi_bus_get_power(struct acpi_device *device, int *state)
186{
187 int result = 0;
188 acpi_status status = 0;
189 unsigned long long psc = 0;
190
191 if (!device || !state)
192 return -EINVAL;
193
194 *state = ACPI_STATE_UNKNOWN;
195
196 if (device->flags.power_manageable) {
197 /*
198 * Get the device's power state either directly (via _PSC) or
199 * indirectly (via power resources).
200 */
201 if (device->power.flags.power_resources) {
202 result = acpi_power_get_inferred_state(device, state);
203 if (result)
204 return result;
205 } else if (device->power.flags.explicit_get) {
206 status = acpi_evaluate_integer(device->handle, "_PSC",
207 NULL, &psc);
208 if (ACPI_FAILURE(status))
209 return -ENODEV;
210 *state = (int)psc;
211 }
212 } else {
213 /* TBD: Non-recursive algorithm for walking up hierarchy. */
214 *state = device->parent ?
215 device->parent->power.state : ACPI_STATE_D0;
216 }
217
218 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
219 device->pnp.bus_id, *state));
220
221 return 0;
222}
223
224
225static int __acpi_bus_set_power(struct acpi_device *device, int state)
226{
227 int result = 0;
228 acpi_status status = AE_OK;
229 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
230
231 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
232 return -EINVAL;
233
234 /* Make sure this is a valid target state */
235
236 if (state == device->power.state) {
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
238 state));
239 return 0;
240 }
241
242 if (!device->power.states[state].flags.valid) {
243 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
244 return -ENODEV;
245 }
246 if (device->parent && (state < device->parent->power.state)) {
247 printk(KERN_WARNING PREFIX
248 "Cannot set device to a higher-powered"
249 " state than parent\n");
250 return -ENODEV;
251 }
252
253 /*
254 * Transition Power
255 * ----------------
256 * On transitions to a high-powered state we first apply power (via
257 * power resources) then evalute _PSx. Conversly for transitions to
258 * a lower-powered state.
259 */
260 if (state < device->power.state) {
261 if (device->power.flags.power_resources) {
262 result = acpi_power_transition(device, state);
263 if (result)
264 goto end;
265 }
266 if (device->power.states[state].flags.explicit_set) {
267 status = acpi_evaluate_object(device->handle,
268 object_name, NULL, NULL);
269 if (ACPI_FAILURE(status)) {
270 result = -ENODEV;
271 goto end;
272 }
273 }
274 } else {
275 if (device->power.states[state].flags.explicit_set) {
276 status = acpi_evaluate_object(device->handle,
277 object_name, NULL, NULL);
278 if (ACPI_FAILURE(status)) {
279 result = -ENODEV;
280 goto end;
281 }
282 }
283 if (device->power.flags.power_resources) {
284 result = acpi_power_transition(device, state);
285 if (result)
286 goto end;
287 }
288 }
289
290 end:
291 if (result)
292 printk(KERN_WARNING PREFIX
293 "Device [%s] failed to transition to D%d\n",
294 device->pnp.bus_id, state);
295 else {
296 device->power.state = state;
297 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
298 "Device [%s] transitioned to D%d\n",
299 device->pnp.bus_id, state));
300 }
301
302 return result;
303}
304
305
306int acpi_bus_set_power(acpi_handle handle, int state)
307{
308 struct acpi_device *device;
309 int result;
310
311 result = acpi_bus_get_device(handle, &device);
312 if (result)
313 return result;
314
315 if (!device->flags.power_manageable) {
316 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
317 "Device [%s] is not power manageable\n",
318 dev_name(&device->dev)));
319 return -ENODEV;
320 }
321
322 return __acpi_bus_set_power(device, state);
323}
324EXPORT_SYMBOL(acpi_bus_set_power);
325
326
327int acpi_bus_init_power(struct acpi_device *device)
328{
329 int state;
330 int result;
331
332 if (!device)
333 return -EINVAL;
334
335 device->power.state = ACPI_STATE_UNKNOWN;
336
337 result = __acpi_bus_get_power(device, &state);
338 if (result)
339 return result;
340
341 if (device->power.flags.power_resources)
342 result = acpi_power_on_resources(device, state);
343
344 if (!result)
345 device->power.state = state;
346
347 return result;
348}
349
350
351int acpi_bus_update_power(acpi_handle handle, int *state_p)
352{
353 struct acpi_device *device;
354 int state;
355 int result;
356
357 result = acpi_bus_get_device(handle, &device);
358 if (result)
359 return result;
360
361 result = __acpi_bus_get_power(device, &state);
362 if (result)
363 return result;
364
365 result = __acpi_bus_set_power(device, state);
366 if (!result && state_p)
367 *state_p = state;
368
369 return result;
370}
371EXPORT_SYMBOL_GPL(acpi_bus_update_power);
372
373
374bool acpi_bus_power_manageable(acpi_handle handle)
375{
376 struct acpi_device *device;
377 int result;
378
379 result = acpi_bus_get_device(handle, &device);
380 return result ? false : device->flags.power_manageable;
381}
382
383EXPORT_SYMBOL(acpi_bus_power_manageable);
384
385bool acpi_bus_can_wakeup(acpi_handle handle)
386{
387 struct acpi_device *device;
388 int result;
389
390 result = acpi_bus_get_device(handle, &device);
391 return result ? false : device->wakeup.flags.valid;
392}
393
394EXPORT_SYMBOL(acpi_bus_can_wakeup);
395
396static void acpi_print_osc_error(acpi_handle handle,
397 struct acpi_osc_context *context, char *error)
398{
399 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
400 int i;
401
402 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
403 printk(KERN_DEBUG "%s\n", error);
404 else {
405 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
406 kfree(buffer.pointer);
407 }
408 printk(KERN_DEBUG"_OSC request data:");
409 for (i = 0; i < context->cap.length; i += sizeof(u32))
410 printk("%x ", *((u32 *)(context->cap.pointer + i)));
411 printk("\n");
412}
413
414static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
415{
416 int i;
417 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
418 24, 26, 28, 30, 32, 34};
419
420 if (strlen(str) != 36)
421 return AE_BAD_PARAMETER;
422 for (i = 0; i < 36; i++) {
423 if (i == 8 || i == 13 || i == 18 || i == 23) {
424 if (str[i] != '-')
425 return AE_BAD_PARAMETER;
426 } else if (!isxdigit(str[i]))
427 return AE_BAD_PARAMETER;
428 }
429 for (i = 0; i < 16; i++) {
430 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
431 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
432 }
433 return AE_OK;
434}
435
436acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
437{
438 acpi_status status;
439 struct acpi_object_list input;
440 union acpi_object in_params[4];
441 union acpi_object *out_obj;
442 u8 uuid[16];
443 u32 errors;
444 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
445
446 if (!context)
447 return AE_ERROR;
448 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
449 return AE_ERROR;
450 context->ret.length = ACPI_ALLOCATE_BUFFER;
451 context->ret.pointer = NULL;
452
453 /* Setting up input parameters */
454 input.count = 4;
455 input.pointer = in_params;
456 in_params[0].type = ACPI_TYPE_BUFFER;
457 in_params[0].buffer.length = 16;
458 in_params[0].buffer.pointer = uuid;
459 in_params[1].type = ACPI_TYPE_INTEGER;
460 in_params[1].integer.value = context->rev;
461 in_params[2].type = ACPI_TYPE_INTEGER;
462 in_params[2].integer.value = context->cap.length/sizeof(u32);
463 in_params[3].type = ACPI_TYPE_BUFFER;
464 in_params[3].buffer.length = context->cap.length;
465 in_params[3].buffer.pointer = context->cap.pointer;
466
467 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
468 if (ACPI_FAILURE(status))
469 return status;
470
471 if (!output.length)
472 return AE_NULL_OBJECT;
473
474 out_obj = output.pointer;
475 if (out_obj->type != ACPI_TYPE_BUFFER
476 || out_obj->buffer.length != context->cap.length) {
477 acpi_print_osc_error(handle, context,
478 "_OSC evaluation returned wrong type");
479 status = AE_TYPE;
480 goto out_kfree;
481 }
482 /* Need to ignore the bit0 in result code */
483 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
484 if (errors) {
485 if (errors & OSC_REQUEST_ERROR)
486 acpi_print_osc_error(handle, context,
487 "_OSC request failed");
488 if (errors & OSC_INVALID_UUID_ERROR)
489 acpi_print_osc_error(handle, context,
490 "_OSC invalid UUID");
491 if (errors & OSC_INVALID_REVISION_ERROR)
492 acpi_print_osc_error(handle, context,
493 "_OSC invalid revision");
494 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
495 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
496 & OSC_QUERY_ENABLE)
497 goto out_success;
498 status = AE_SUPPORT;
499 goto out_kfree;
500 }
501 status = AE_ERROR;
502 goto out_kfree;
503 }
504out_success:
505 context->ret.length = out_obj->buffer.length;
506 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
507 if (!context->ret.pointer) {
508 status = AE_NO_MEMORY;
509 goto out_kfree;
510 }
511 memcpy(context->ret.pointer, out_obj->buffer.pointer,
512 context->ret.length);
513 status = AE_OK;
514
515out_kfree:
516 kfree(output.pointer);
517 if (status != AE_OK)
518 context->ret.pointer = NULL;
519 return status;
520}
521EXPORT_SYMBOL(acpi_run_osc);
522
523bool osc_sb_apei_support_acked;
524static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
525static void acpi_bus_osc_support(void)
526{
527 u32 capbuf[2];
528 struct acpi_osc_context context = {
529 .uuid_str = sb_uuid_str,
530 .rev = 1,
531 .cap.length = 8,
532 .cap.pointer = capbuf,
533 };
534 acpi_handle handle;
535
536 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
537 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
538#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
539 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
540 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
541#endif
542
543#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
544 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
545#endif
546
547 if (!ghes_disable)
548 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
549 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
550 return;
551 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
552 u32 *capbuf_ret = context.ret.pointer;
553 if (context.ret.length > OSC_SUPPORT_TYPE)
554 osc_sb_apei_support_acked =
555 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
556 kfree(context.ret.pointer);
557 }
558 /* do we need to check other returned cap? Sounds no */
559}
560
561/* --------------------------------------------------------------------------
562 Event Management
563 -------------------------------------------------------------------------- */
564
565#ifdef CONFIG_ACPI_PROC_EVENT
566static DEFINE_SPINLOCK(acpi_bus_event_lock);
567
568LIST_HEAD(acpi_bus_event_list);
569DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
570
571extern int event_is_open;
572
573int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
574{
575 struct acpi_bus_event *event;
576 unsigned long flags = 0;
577
578 /* drop event on the floor if no one's listening */
579 if (!event_is_open)
580 return 0;
581
582 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
583 if (!event)
584 return -ENOMEM;
585
586 strcpy(event->device_class, device_class);
587 strcpy(event->bus_id, bus_id);
588 event->type = type;
589 event->data = data;
590
591 spin_lock_irqsave(&acpi_bus_event_lock, flags);
592 list_add_tail(&event->node, &acpi_bus_event_list);
593 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
594
595 wake_up_interruptible(&acpi_bus_event_queue);
596
597 return 0;
598
599}
600
601EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
602
603int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
604{
605 if (!device)
606 return -EINVAL;
607 return acpi_bus_generate_proc_event4(device->pnp.device_class,
608 device->pnp.bus_id, type, data);
609}
610
611EXPORT_SYMBOL(acpi_bus_generate_proc_event);
612
613int acpi_bus_receive_event(struct acpi_bus_event *event)
614{
615 unsigned long flags = 0;
616 struct acpi_bus_event *entry = NULL;
617
618 DECLARE_WAITQUEUE(wait, current);
619
620
621 if (!event)
622 return -EINVAL;
623
624 if (list_empty(&acpi_bus_event_list)) {
625
626 set_current_state(TASK_INTERRUPTIBLE);
627 add_wait_queue(&acpi_bus_event_queue, &wait);
628
629 if (list_empty(&acpi_bus_event_list))
630 schedule();
631
632 remove_wait_queue(&acpi_bus_event_queue, &wait);
633 set_current_state(TASK_RUNNING);
634
635 if (signal_pending(current))
636 return -ERESTARTSYS;
637 }
638
639 spin_lock_irqsave(&acpi_bus_event_lock, flags);
640 if (!list_empty(&acpi_bus_event_list)) {
641 entry = list_entry(acpi_bus_event_list.next,
642 struct acpi_bus_event, node);
643 list_del(&entry->node);
644 }
645 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
646
647 if (!entry)
648 return -ENODEV;
649
650 memcpy(event, entry, sizeof(struct acpi_bus_event));
651
652 kfree(entry);
653
654 return 0;
655}
656
657#endif /* CONFIG_ACPI_PROC_EVENT */
658
659/* --------------------------------------------------------------------------
660 Notification Handling
661 -------------------------------------------------------------------------- */
662
663static void acpi_bus_check_device(acpi_handle handle)
664{
665 struct acpi_device *device;
666 acpi_status status;
667 struct acpi_device_status old_status;
668
669 if (acpi_bus_get_device(handle, &device))
670 return;
671 if (!device)
672 return;
673
674 old_status = device->status;
675
676 /*
677 * Make sure this device's parent is present before we go about
678 * messing with the device.
679 */
680 if (device->parent && !device->parent->status.present) {
681 device->status = device->parent->status;
682 return;
683 }
684
685 status = acpi_bus_get_status(device);
686 if (ACPI_FAILURE(status))
687 return;
688
689 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
690 return;
691
692 /*
693 * Device Insertion/Removal
694 */
695 if ((device->status.present) && !(old_status.present)) {
696 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
697 /* TBD: Handle device insertion */
698 } else if (!(device->status.present) && (old_status.present)) {
699 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
700 /* TBD: Handle device removal */
701 }
702}
703
704static void acpi_bus_check_scope(acpi_handle handle)
705{
706 /* Status Change? */
707 acpi_bus_check_device(handle);
708
709 /*
710 * TBD: Enumerate child devices within this device's scope and
711 * run acpi_bus_check_device()'s on them.
712 */
713}
714
715static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
716int register_acpi_bus_notifier(struct notifier_block *nb)
717{
718 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
719}
720EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
721
722void unregister_acpi_bus_notifier(struct notifier_block *nb)
723{
724 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
725}
726EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
727
728/**
729 * acpi_bus_notify
730 * ---------------
731 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
732 */
733static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
734{
735 struct acpi_device *device = NULL;
736 struct acpi_driver *driver;
737
738 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
739 type, handle));
740
741 blocking_notifier_call_chain(&acpi_bus_notify_list,
742 type, (void *)handle);
743
744 switch (type) {
745
746 case ACPI_NOTIFY_BUS_CHECK:
747 acpi_bus_check_scope(handle);
748 /*
749 * TBD: We'll need to outsource certain events to non-ACPI
750 * drivers via the device manager (device.c).
751 */
752 break;
753
754 case ACPI_NOTIFY_DEVICE_CHECK:
755 acpi_bus_check_device(handle);
756 /*
757 * TBD: We'll need to outsource certain events to non-ACPI
758 * drivers via the device manager (device.c).
759 */
760 break;
761
762 case ACPI_NOTIFY_DEVICE_WAKE:
763 /* TBD */
764 break;
765
766 case ACPI_NOTIFY_EJECT_REQUEST:
767 /* TBD */
768 break;
769
770 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
771 /* TBD: Exactly what does 'light' mean? */
772 break;
773
774 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
775 /* TBD */
776 break;
777
778 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
779 /* TBD */
780 break;
781
782 case ACPI_NOTIFY_POWER_FAULT:
783 /* TBD */
784 break;
785
786 default:
787 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
788 "Received unknown/unsupported notification [%08x]\n",
789 type));
790 break;
791 }
792
793 acpi_bus_get_device(handle, &device);
794 if (device) {
795 driver = device->driver;
796 if (driver && driver->ops.notify &&
797 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
798 driver->ops.notify(device, type);
799 }
800}
801
802/* --------------------------------------------------------------------------
803 Initialization/Cleanup
804 -------------------------------------------------------------------------- */
805
806static int __init acpi_bus_init_irq(void)
807{
808 acpi_status status = AE_OK;
809 union acpi_object arg = { ACPI_TYPE_INTEGER };
810 struct acpi_object_list arg_list = { 1, &arg };
811 char *message = NULL;
812
813
814 /*
815 * Let the system know what interrupt model we are using by
816 * evaluating the \_PIC object, if exists.
817 */
818
819 switch (acpi_irq_model) {
820 case ACPI_IRQ_MODEL_PIC:
821 message = "PIC";
822 break;
823 case ACPI_IRQ_MODEL_IOAPIC:
824 message = "IOAPIC";
825 break;
826 case ACPI_IRQ_MODEL_IOSAPIC:
827 message = "IOSAPIC";
828 break;
829 case ACPI_IRQ_MODEL_PLATFORM:
830 message = "platform specific model";
831 break;
832 default:
833 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
834 return -ENODEV;
835 }
836
837 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
838
839 arg.integer.value = acpi_irq_model;
840
841 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
842 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
843 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
844 return -ENODEV;
845 }
846
847 return 0;
848}
849
850u8 acpi_gbl_permanent_mmap;
851
852
853void __init acpi_early_init(void)
854{
855 acpi_status status = AE_OK;
856
857 if (acpi_disabled)
858 return;
859
860 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
861
862 /* enable workarounds, unless strict ACPI spec. compliance */
863 if (!acpi_strict)
864 acpi_gbl_enable_interpreter_slack = TRUE;
865
866 acpi_gbl_permanent_mmap = 1;
867
868 /*
869 * If the machine falls into the DMI check table,
870 * DSDT will be copied to memory
871 */
872 dmi_check_system(dsdt_dmi_table);
873
874 status = acpi_reallocate_root_table();
875 if (ACPI_FAILURE(status)) {
876 printk(KERN_ERR PREFIX
877 "Unable to reallocate ACPI tables\n");
878 goto error0;
879 }
880
881 status = acpi_initialize_subsystem();
882 if (ACPI_FAILURE(status)) {
883 printk(KERN_ERR PREFIX
884 "Unable to initialize the ACPI Interpreter\n");
885 goto error0;
886 }
887
888 status = acpi_load_tables();
889 if (ACPI_FAILURE(status)) {
890 printk(KERN_ERR PREFIX
891 "Unable to load the System Description Tables\n");
892 goto error0;
893 }
894
895#ifdef CONFIG_X86
896 if (!acpi_ioapic) {
897 /* compatible (0) means level (3) */
898 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
899 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
900 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
901 }
902 /* Set PIC-mode SCI trigger type */
903 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
904 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
905 } else {
906 /*
907 * now that acpi_gbl_FADT is initialized,
908 * update it with result from INT_SRC_OVR parsing
909 */
910 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
911 }
912#endif
913
914 status =
915 acpi_enable_subsystem(~
916 (ACPI_NO_HARDWARE_INIT |
917 ACPI_NO_ACPI_ENABLE));
918 if (ACPI_FAILURE(status)) {
919 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
920 goto error0;
921 }
922
923 return;
924
925 error0:
926 disable_acpi();
927 return;
928}
929
930static int __init acpi_bus_init(void)
931{
932 int result = 0;
933 acpi_status status = AE_OK;
934 extern acpi_status acpi_os_initialize1(void);
935
936 acpi_os_initialize1();
937
938 status =
939 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
940 if (ACPI_FAILURE(status)) {
941 printk(KERN_ERR PREFIX
942 "Unable to start the ACPI Interpreter\n");
943 goto error1;
944 }
945
946 /*
947 * ACPI 2.0 requires the EC driver to be loaded and work before
948 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
949 * is called).
950 *
951 * This is accomplished by looking for the ECDT table, and getting
952 * the EC parameters out of that.
953 */
954 status = acpi_ec_ecdt_probe();
955 /* Ignore result. Not having an ECDT is not fatal. */
956
957 acpi_bus_osc_support();
958
959 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
960 if (ACPI_FAILURE(status)) {
961 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
962 goto error1;
963 }
964
965 /*
966 * _PDC control method may load dynamic SSDT tables,
967 * and we need to install the table handler before that.
968 */
969 acpi_sysfs_init();
970
971 acpi_early_processor_set_pdc();
972
973 /*
974 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
975 * is necessary to enable it as early as possible.
976 */
977 acpi_boot_ec_enable();
978
979 printk(KERN_INFO PREFIX "Interpreter enabled\n");
980
981 /* Initialize sleep structures */
982 acpi_sleep_init();
983
984 /*
985 * Get the system interrupt model and evaluate \_PIC.
986 */
987 result = acpi_bus_init_irq();
988 if (result)
989 goto error1;
990
991 /*
992 * Register the for all standard device notifications.
993 */
994 status =
995 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
996 &acpi_bus_notify, NULL);
997 if (ACPI_FAILURE(status)) {
998 printk(KERN_ERR PREFIX
999 "Unable to register for device notifications\n");
1000 goto error1;
1001 }
1002
1003 /*
1004 * Create the top ACPI proc directory
1005 */
1006 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1007
1008 return 0;
1009
1010 /* Mimic structured exception handling */
1011 error1:
1012 acpi_terminate();
1013 return -ENODEV;
1014}
1015
1016struct kobject *acpi_kobj;
1017
1018static int __init acpi_init(void)
1019{
1020 int result;
1021
1022 if (acpi_disabled) {
1023 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1024 return -ENODEV;
1025 }
1026
1027 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1028 if (!acpi_kobj) {
1029 printk(KERN_WARNING "%s: kset create error\n", __func__);
1030 acpi_kobj = NULL;
1031 }
1032
1033 init_acpi_device_notify();
1034 result = acpi_bus_init();
1035 if (result) {
1036 disable_acpi();
1037 return result;
1038 }
1039
1040 pci_mmcfg_late_init();
1041 acpi_scan_init();
1042 acpi_ec_init();
1043 acpi_debugfs_init();
1044 acpi_sleep_proc_init();
1045 acpi_wakeup_device_init();
1046 return 0;
1047}
1048
1049subsys_initcall(acpi_init);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
4 *
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 */
7
8#define pr_fmt(fmt) "ACPI: " fmt
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/ioport.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/sched.h>
16#include <linux/pm.h>
17#include <linux/device.h>
18#include <linux/proc_fs.h>
19#include <linux/acpi.h>
20#include <linux/slab.h>
21#include <linux/regulator/machine.h>
22#include <linux/workqueue.h>
23#include <linux/reboot.h>
24#include <linux/delay.h>
25#ifdef CONFIG_X86
26#include <asm/mpspec.h>
27#include <linux/dmi.h>
28#endif
29#include <linux/acpi_agdi.h>
30#include <linux/acpi_apmt.h>
31#include <linux/acpi_iort.h>
32#include <linux/acpi_viot.h>
33#include <linux/pci.h>
34#include <acpi/apei.h>
35#include <linux/suspend.h>
36#include <linux/prmt.h>
37
38#include "internal.h"
39
40struct acpi_device *acpi_root;
41struct proc_dir_entry *acpi_root_dir;
42EXPORT_SYMBOL(acpi_root_dir);
43
44#ifdef CONFIG_X86
45#ifdef CONFIG_ACPI_CUSTOM_DSDT
46static inline int set_copy_dsdt(const struct dmi_system_id *id)
47{
48 return 0;
49}
50#else
51static int set_copy_dsdt(const struct dmi_system_id *id)
52{
53 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
54 acpi_gbl_copy_dsdt_locally = 1;
55 return 0;
56}
57#endif
58
59static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
60 /*
61 * Invoke DSDT corruption work-around on all Toshiba Satellite.
62 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
63 */
64 {
65 .callback = set_copy_dsdt,
66 .ident = "TOSHIBA Satellite",
67 .matches = {
68 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
69 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
70 },
71 },
72 {}
73};
74#endif
75
76/* --------------------------------------------------------------------------
77 Device Management
78 -------------------------------------------------------------------------- */
79
80acpi_status acpi_bus_get_status_handle(acpi_handle handle,
81 unsigned long long *sta)
82{
83 acpi_status status;
84
85 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
86 if (ACPI_SUCCESS(status))
87 return AE_OK;
88
89 if (status == AE_NOT_FOUND) {
90 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
91 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
92 return AE_OK;
93 }
94 return status;
95}
96EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
97
98int acpi_bus_get_status(struct acpi_device *device)
99{
100 acpi_status status;
101 unsigned long long sta;
102
103 if (acpi_device_override_status(device, &sta)) {
104 acpi_set_device_status(device, sta);
105 return 0;
106 }
107
108 /* Battery devices must have their deps met before calling _STA */
109 if (acpi_device_is_battery(device) && device->dep_unmet) {
110 acpi_set_device_status(device, 0);
111 return 0;
112 }
113
114 status = acpi_bus_get_status_handle(device->handle, &sta);
115 if (ACPI_FAILURE(status))
116 return -ENODEV;
117
118 acpi_set_device_status(device, sta);
119
120 if (device->status.functional && !device->status.present) {
121 pr_debug("Device [%s] status [%08x]: functional but not present\n",
122 device->pnp.bus_id, (u32)sta);
123 }
124
125 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
126 return 0;
127}
128EXPORT_SYMBOL(acpi_bus_get_status);
129
130void acpi_bus_private_data_handler(acpi_handle handle,
131 void *context)
132{
133 return;
134}
135EXPORT_SYMBOL(acpi_bus_private_data_handler);
136
137int acpi_bus_attach_private_data(acpi_handle handle, void *data)
138{
139 acpi_status status;
140
141 status = acpi_attach_data(handle,
142 acpi_bus_private_data_handler, data);
143 if (ACPI_FAILURE(status)) {
144 acpi_handle_debug(handle, "Error attaching device data\n");
145 return -ENODEV;
146 }
147
148 return 0;
149}
150EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
151
152int acpi_bus_get_private_data(acpi_handle handle, void **data)
153{
154 acpi_status status;
155
156 if (!data)
157 return -EINVAL;
158
159 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
160 if (ACPI_FAILURE(status)) {
161 acpi_handle_debug(handle, "No context for object\n");
162 return -ENODEV;
163 }
164
165 return 0;
166}
167EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
168
169void acpi_bus_detach_private_data(acpi_handle handle)
170{
171 acpi_detach_data(handle, acpi_bus_private_data_handler);
172}
173EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
174
175static void acpi_print_osc_error(acpi_handle handle,
176 struct acpi_osc_context *context, char *error)
177{
178 int i;
179
180 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
181
182 pr_debug("_OSC request data:");
183 for (i = 0; i < context->cap.length; i += sizeof(u32))
184 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
185
186 pr_debug("\n");
187}
188
189acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
190{
191 acpi_status status;
192 struct acpi_object_list input;
193 union acpi_object in_params[4];
194 union acpi_object *out_obj;
195 guid_t guid;
196 u32 errors;
197 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
198
199 if (!context)
200 return AE_ERROR;
201 if (guid_parse(context->uuid_str, &guid))
202 return AE_ERROR;
203 context->ret.length = ACPI_ALLOCATE_BUFFER;
204 context->ret.pointer = NULL;
205
206 /* Setting up input parameters */
207 input.count = 4;
208 input.pointer = in_params;
209 in_params[0].type = ACPI_TYPE_BUFFER;
210 in_params[0].buffer.length = 16;
211 in_params[0].buffer.pointer = (u8 *)&guid;
212 in_params[1].type = ACPI_TYPE_INTEGER;
213 in_params[1].integer.value = context->rev;
214 in_params[2].type = ACPI_TYPE_INTEGER;
215 in_params[2].integer.value = context->cap.length/sizeof(u32);
216 in_params[3].type = ACPI_TYPE_BUFFER;
217 in_params[3].buffer.length = context->cap.length;
218 in_params[3].buffer.pointer = context->cap.pointer;
219
220 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
221 if (ACPI_FAILURE(status))
222 return status;
223
224 if (!output.length)
225 return AE_NULL_OBJECT;
226
227 out_obj = output.pointer;
228 if (out_obj->type != ACPI_TYPE_BUFFER
229 || out_obj->buffer.length != context->cap.length) {
230 acpi_print_osc_error(handle, context,
231 "_OSC evaluation returned wrong type");
232 status = AE_TYPE;
233 goto out_kfree;
234 }
235 /* Need to ignore the bit0 in result code */
236 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
237 if (errors) {
238 if (errors & OSC_REQUEST_ERROR)
239 acpi_print_osc_error(handle, context,
240 "_OSC request failed");
241 if (errors & OSC_INVALID_UUID_ERROR)
242 acpi_print_osc_error(handle, context,
243 "_OSC invalid UUID");
244 if (errors & OSC_INVALID_REVISION_ERROR)
245 acpi_print_osc_error(handle, context,
246 "_OSC invalid revision");
247 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
248 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
249 & OSC_QUERY_ENABLE)
250 goto out_success;
251 status = AE_SUPPORT;
252 goto out_kfree;
253 }
254 status = AE_ERROR;
255 goto out_kfree;
256 }
257out_success:
258 context->ret.length = out_obj->buffer.length;
259 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
260 context->ret.length, GFP_KERNEL);
261 if (!context->ret.pointer) {
262 status = AE_NO_MEMORY;
263 goto out_kfree;
264 }
265 status = AE_OK;
266
267out_kfree:
268 kfree(output.pointer);
269 return status;
270}
271EXPORT_SYMBOL(acpi_run_osc);
272
273bool osc_sb_apei_support_acked;
274
275/*
276 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
277 * OSPM supports platform coordinated low power idle(LPI) states
278 */
279bool osc_pc_lpi_support_confirmed;
280EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
281
282/*
283 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
284 * Starting with ACPI Specification 6.2, all _CPC registers can be in
285 * PCC, System Memory, System IO, or Functional Fixed Hardware address
286 * spaces. OSPM support for this more flexible register space scheme is
287 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
288 *
289 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
290 * - PCC or Functional Fixed Hardware address space if defined
291 * - SystemMemory address space (NULL register) if not defined
292 */
293bool osc_cpc_flexible_adr_space_confirmed;
294EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
295
296/*
297 * ACPI 6.4 Operating System Capabilities for USB.
298 */
299bool osc_sb_native_usb4_support_confirmed;
300EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
301
302bool osc_sb_cppc2_support_acked;
303
304static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
305static void acpi_bus_osc_negotiate_platform_control(void)
306{
307 u32 capbuf[2], *capbuf_ret;
308 struct acpi_osc_context context = {
309 .uuid_str = sb_uuid_str,
310 .rev = 1,
311 .cap.length = 8,
312 .cap.pointer = capbuf,
313 };
314 acpi_handle handle;
315
316 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
317 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
318 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
319 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
320 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
322
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
325 if (IS_ENABLED(CONFIG_ACPI_PRMT))
326 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
327 if (IS_ENABLED(CONFIG_ACPI_FFH))
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
329
330#ifdef CONFIG_ARM64
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
332#endif
333#ifdef CONFIG_X86
334 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
335#endif
336
337#ifdef CONFIG_ACPI_CPPC_LIB
338 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
340#endif
341
342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
343
344 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
346
347 if (IS_ENABLED(CONFIG_USB4))
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
349
350 if (!ghes_disable)
351 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
352 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
353 return;
354
355 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
356 return;
357
358 capbuf_ret = context.ret.pointer;
359 if (context.ret.length <= OSC_SUPPORT_DWORD) {
360 kfree(context.ret.pointer);
361 return;
362 }
363
364 /*
365 * Now run _OSC again with query flag clear and with the caps
366 * supported by both the OS and the platform.
367 */
368 capbuf[OSC_QUERY_DWORD] = 0;
369 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
370 kfree(context.ret.pointer);
371
372 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
373 return;
374
375 capbuf_ret = context.ret.pointer;
376 if (context.ret.length > OSC_SUPPORT_DWORD) {
377#ifdef CONFIG_ACPI_CPPC_LIB
378 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
379#endif
380
381 osc_sb_apei_support_acked =
382 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
383 osc_pc_lpi_support_confirmed =
384 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
385 osc_sb_native_usb4_support_confirmed =
386 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
387 osc_cpc_flexible_adr_space_confirmed =
388 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
389 }
390
391 kfree(context.ret.pointer);
392}
393
394/*
395 * Native control of USB4 capabilities. If any of the tunneling bits is
396 * set it means OS is in control and we use software based connection
397 * manager.
398 */
399u32 osc_sb_native_usb4_control;
400EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
401
402static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
403{
404 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
405 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
406 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
407 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
408 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
409}
410
411static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
412static void acpi_bus_osc_negotiate_usb_control(void)
413{
414 u32 capbuf[3];
415 struct acpi_osc_context context = {
416 .uuid_str = sb_usb_uuid_str,
417 .rev = 1,
418 .cap.length = sizeof(capbuf),
419 .cap.pointer = capbuf,
420 };
421 acpi_handle handle;
422 acpi_status status;
423 u32 control;
424
425 if (!osc_sb_native_usb4_support_confirmed)
426 return;
427
428 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
429 return;
430
431 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
432 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
433
434 capbuf[OSC_QUERY_DWORD] = 0;
435 capbuf[OSC_SUPPORT_DWORD] = 0;
436 capbuf[OSC_CONTROL_DWORD] = control;
437
438 status = acpi_run_osc(handle, &context);
439 if (ACPI_FAILURE(status))
440 return;
441
442 if (context.ret.length != sizeof(capbuf)) {
443 pr_info("USB4 _OSC: returned invalid length buffer\n");
444 goto out_free;
445 }
446
447 osc_sb_native_usb4_control =
448 control & acpi_osc_ctx_get_pci_control(&context);
449
450 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
451 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
452 osc_sb_native_usb4_control);
453
454out_free:
455 kfree(context.ret.pointer);
456}
457
458/* --------------------------------------------------------------------------
459 Notification Handling
460 -------------------------------------------------------------------------- */
461
462/*
463 * acpi_bus_notify
464 * ---------------
465 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
466 */
467static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
468{
469 struct acpi_device *adev;
470 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
471 bool hotplug_event = false;
472
473 switch (type) {
474 case ACPI_NOTIFY_BUS_CHECK:
475 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
476 hotplug_event = true;
477 break;
478
479 case ACPI_NOTIFY_DEVICE_CHECK:
480 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
481 hotplug_event = true;
482 break;
483
484 case ACPI_NOTIFY_DEVICE_WAKE:
485 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
486 break;
487
488 case ACPI_NOTIFY_EJECT_REQUEST:
489 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
490 hotplug_event = true;
491 break;
492
493 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
494 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
495 /* TBD: Exactly what does 'light' mean? */
496 break;
497
498 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
499 acpi_handle_err(handle, "Device cannot be configured due "
500 "to a frequency mismatch\n");
501 break;
502
503 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
504 acpi_handle_err(handle, "Device cannot be configured due "
505 "to a bus mode mismatch\n");
506 break;
507
508 case ACPI_NOTIFY_POWER_FAULT:
509 acpi_handle_err(handle, "Device has suffered a power fault\n");
510 break;
511
512 default:
513 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
514 break;
515 }
516
517 adev = acpi_get_acpi_dev(handle);
518 if (!adev)
519 goto err;
520
521 if (adev->dev.driver) {
522 struct acpi_driver *driver = to_acpi_driver(adev->dev.driver);
523
524 if (driver && driver->ops.notify &&
525 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
526 driver->ops.notify(adev, type);
527 }
528
529 if (!hotplug_event) {
530 acpi_put_acpi_dev(adev);
531 return;
532 }
533
534 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
535 return;
536
537 acpi_put_acpi_dev(adev);
538
539 err:
540 acpi_evaluate_ost(handle, type, ost_code, NULL);
541}
542
543static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
544{
545 struct acpi_device *device = data;
546 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
547
548 acpi_drv->ops.notify(device, event);
549}
550
551static void acpi_notify_device_fixed(void *data)
552{
553 struct acpi_device *device = data;
554
555 /* Fixed hardware devices have no handles */
556 acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
557}
558
559static u32 acpi_device_fixed_event(void *data)
560{
561 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
562 return ACPI_INTERRUPT_HANDLED;
563}
564
565static int acpi_device_install_notify_handler(struct acpi_device *device)
566{
567 acpi_status status;
568
569 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
570 status =
571 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
572 acpi_device_fixed_event,
573 device);
574 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
575 status =
576 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
577 acpi_device_fixed_event,
578 device);
579 else
580 status = acpi_install_notify_handler(device->handle,
581 ACPI_DEVICE_NOTIFY,
582 acpi_notify_device,
583 device);
584
585 if (ACPI_FAILURE(status))
586 return -EINVAL;
587 return 0;
588}
589
590static void acpi_device_remove_notify_handler(struct acpi_device *device)
591{
592 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
593 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
594 acpi_device_fixed_event);
595 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
596 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
597 acpi_device_fixed_event);
598 else
599 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
600 acpi_notify_device);
601}
602
603/* Handle events targeting \_SB device (at present only graceful shutdown) */
604
605#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
606#define ACPI_SB_INDICATE_INTERVAL 10000
607
608static void sb_notify_work(struct work_struct *dummy)
609{
610 acpi_handle sb_handle;
611
612 orderly_poweroff(true);
613
614 /*
615 * After initiating graceful shutdown, the ACPI spec requires OSPM
616 * to evaluate _OST method once every 10seconds to indicate that
617 * the shutdown is in progress
618 */
619 acpi_get_handle(NULL, "\\_SB", &sb_handle);
620 while (1) {
621 pr_info("Graceful shutdown in progress.\n");
622 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
623 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
624 msleep(ACPI_SB_INDICATE_INTERVAL);
625 }
626}
627
628static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
629{
630 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
631
632 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
633 if (!work_busy(&acpi_sb_work))
634 schedule_work(&acpi_sb_work);
635 } else
636 pr_warn("event %x is not supported by \\_SB device\n", event);
637}
638
639static int __init acpi_setup_sb_notify_handler(void)
640{
641 acpi_handle sb_handle;
642
643 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
644 return -ENXIO;
645
646 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
647 acpi_sb_notify, NULL)))
648 return -EINVAL;
649
650 return 0;
651}
652
653/* --------------------------------------------------------------------------
654 Device Matching
655 -------------------------------------------------------------------------- */
656
657/**
658 * acpi_get_first_physical_node - Get first physical node of an ACPI device
659 * @adev: ACPI device in question
660 *
661 * Return: First physical node of ACPI device @adev
662 */
663struct device *acpi_get_first_physical_node(struct acpi_device *adev)
664{
665 struct mutex *physical_node_lock = &adev->physical_node_lock;
666 struct device *phys_dev;
667
668 mutex_lock(physical_node_lock);
669 if (list_empty(&adev->physical_node_list)) {
670 phys_dev = NULL;
671 } else {
672 const struct acpi_device_physical_node *node;
673
674 node = list_first_entry(&adev->physical_node_list,
675 struct acpi_device_physical_node, node);
676
677 phys_dev = node->dev;
678 }
679 mutex_unlock(physical_node_lock);
680 return phys_dev;
681}
682EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
683
684static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
685 const struct device *dev)
686{
687 const struct device *phys_dev = acpi_get_first_physical_node(adev);
688
689 return phys_dev && phys_dev == dev ? adev : NULL;
690}
691
692/**
693 * acpi_device_is_first_physical_node - Is given dev first physical node
694 * @adev: ACPI companion device
695 * @dev: Physical device to check
696 *
697 * Function checks if given @dev is the first physical devices attached to
698 * the ACPI companion device. This distinction is needed in some cases
699 * where the same companion device is shared between many physical devices.
700 *
701 * Note that the caller have to provide valid @adev pointer.
702 */
703bool acpi_device_is_first_physical_node(struct acpi_device *adev,
704 const struct device *dev)
705{
706 return !!acpi_primary_dev_companion(adev, dev);
707}
708
709/*
710 * acpi_companion_match() - Can we match via ACPI companion device
711 * @dev: Device in question
712 *
713 * Check if the given device has an ACPI companion and if that companion has
714 * a valid list of PNP IDs, and if the device is the first (primary) physical
715 * device associated with it. Return the companion pointer if that's the case
716 * or NULL otherwise.
717 *
718 * If multiple physical devices are attached to a single ACPI companion, we need
719 * to be careful. The usage scenario for this kind of relationship is that all
720 * of the physical devices in question use resources provided by the ACPI
721 * companion. A typical case is an MFD device where all the sub-devices share
722 * the parent's ACPI companion. In such cases we can only allow the primary
723 * (first) physical device to be matched with the help of the companion's PNP
724 * IDs.
725 *
726 * Additional physical devices sharing the ACPI companion can still use
727 * resources available from it but they will be matched normally using functions
728 * provided by their bus types (and analogously for their modalias).
729 */
730struct acpi_device *acpi_companion_match(const struct device *dev)
731{
732 struct acpi_device *adev;
733
734 adev = ACPI_COMPANION(dev);
735 if (!adev)
736 return NULL;
737
738 if (list_empty(&adev->pnp.ids))
739 return NULL;
740
741 return acpi_primary_dev_companion(adev, dev);
742}
743
744/**
745 * acpi_of_match_device - Match device object using the "compatible" property.
746 * @adev: ACPI device object to match.
747 * @of_match_table: List of device IDs to match against.
748 * @of_id: OF ID if matched
749 *
750 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
751 * identifiers and a _DSD object with the "compatible" property, use that
752 * property to match against the given list of identifiers.
753 */
754static bool acpi_of_match_device(struct acpi_device *adev,
755 const struct of_device_id *of_match_table,
756 const struct of_device_id **of_id)
757{
758 const union acpi_object *of_compatible, *obj;
759 int i, nval;
760
761 if (!adev)
762 return false;
763
764 of_compatible = adev->data.of_compatible;
765 if (!of_match_table || !of_compatible)
766 return false;
767
768 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
769 nval = of_compatible->package.count;
770 obj = of_compatible->package.elements;
771 } else { /* Must be ACPI_TYPE_STRING. */
772 nval = 1;
773 obj = of_compatible;
774 }
775 /* Now we can look for the driver DT compatible strings */
776 for (i = 0; i < nval; i++, obj++) {
777 const struct of_device_id *id;
778
779 for (id = of_match_table; id->compatible[0]; id++)
780 if (!strcasecmp(obj->string.pointer, id->compatible)) {
781 if (of_id)
782 *of_id = id;
783 return true;
784 }
785 }
786
787 return false;
788}
789
790static bool acpi_of_modalias(struct acpi_device *adev,
791 char *modalias, size_t len)
792{
793 const union acpi_object *of_compatible;
794 const union acpi_object *obj;
795 const char *str, *chr;
796
797 of_compatible = adev->data.of_compatible;
798 if (!of_compatible)
799 return false;
800
801 if (of_compatible->type == ACPI_TYPE_PACKAGE)
802 obj = of_compatible->package.elements;
803 else /* Must be ACPI_TYPE_STRING. */
804 obj = of_compatible;
805
806 str = obj->string.pointer;
807 chr = strchr(str, ',');
808 strscpy(modalias, chr ? chr + 1 : str, len);
809
810 return true;
811}
812
813/**
814 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
815 * @adev: ACPI device object to match
816 * @default_id: ID string to use as default if no compatible string found
817 * @modalias: Pointer to buffer that modalias value will be copied into
818 * @len: Length of modalias buffer
819 *
820 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
821 * If there is a compatible string for @adev, it will be copied to @modalias
822 * with the vendor prefix stripped; otherwise, @default_id will be used.
823 */
824void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
825 char *modalias, size_t len)
826{
827 if (!acpi_of_modalias(adev, modalias, len))
828 strscpy(modalias, default_id, len);
829}
830EXPORT_SYMBOL_GPL(acpi_set_modalias);
831
832static bool __acpi_match_device_cls(const struct acpi_device_id *id,
833 struct acpi_hardware_id *hwid)
834{
835 int i, msk, byte_shift;
836 char buf[3];
837
838 if (!id->cls)
839 return false;
840
841 /* Apply class-code bitmask, before checking each class-code byte */
842 for (i = 1; i <= 3; i++) {
843 byte_shift = 8 * (3 - i);
844 msk = (id->cls_msk >> byte_shift) & 0xFF;
845 if (!msk)
846 continue;
847
848 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
849 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
850 return false;
851 }
852 return true;
853}
854
855static bool __acpi_match_device(struct acpi_device *device,
856 const struct acpi_device_id *acpi_ids,
857 const struct of_device_id *of_ids,
858 const struct acpi_device_id **acpi_id,
859 const struct of_device_id **of_id)
860{
861 const struct acpi_device_id *id;
862 struct acpi_hardware_id *hwid;
863
864 /*
865 * If the device is not present, it is unnecessary to load device
866 * driver for it.
867 */
868 if (!device || !device->status.present)
869 return false;
870
871 list_for_each_entry(hwid, &device->pnp.ids, list) {
872 /* First, check the ACPI/PNP IDs provided by the caller. */
873 if (acpi_ids) {
874 for (id = acpi_ids; id->id[0] || id->cls; id++) {
875 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
876 goto out_acpi_match;
877 if (id->cls && __acpi_match_device_cls(id, hwid))
878 goto out_acpi_match;
879 }
880 }
881
882 /*
883 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
884 * "compatible" property if found.
885 */
886 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
887 return acpi_of_match_device(device, of_ids, of_id);
888 }
889 return false;
890
891out_acpi_match:
892 if (acpi_id)
893 *acpi_id = id;
894 return true;
895}
896
897/**
898 * acpi_match_device - Match a struct device against a given list of ACPI IDs
899 * @ids: Array of struct acpi_device_id object to match against.
900 * @dev: The device structure to match.
901 *
902 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
903 * object for that handle and use that object to match against a given list of
904 * device IDs.
905 *
906 * Return a pointer to the first matching ID on success or %NULL on failure.
907 */
908const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
909 const struct device *dev)
910{
911 const struct acpi_device_id *id = NULL;
912
913 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
914 return id;
915}
916EXPORT_SYMBOL_GPL(acpi_match_device);
917
918static const void *acpi_of_device_get_match_data(const struct device *dev)
919{
920 struct acpi_device *adev = ACPI_COMPANION(dev);
921 const struct of_device_id *match = NULL;
922
923 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
924 return NULL;
925
926 return match->data;
927}
928
929const void *acpi_device_get_match_data(const struct device *dev)
930{
931 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
932 const struct acpi_device_id *match;
933
934 if (!acpi_ids)
935 return acpi_of_device_get_match_data(dev);
936
937 match = acpi_match_device(acpi_ids, dev);
938 if (!match)
939 return NULL;
940
941 return (const void *)match->driver_data;
942}
943EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
944
945int acpi_match_device_ids(struct acpi_device *device,
946 const struct acpi_device_id *ids)
947{
948 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
949}
950EXPORT_SYMBOL(acpi_match_device_ids);
951
952bool acpi_driver_match_device(struct device *dev,
953 const struct device_driver *drv)
954{
955 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
956 const struct of_device_id *of_ids = drv->of_match_table;
957
958 if (!acpi_ids)
959 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
960
961 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
962}
963EXPORT_SYMBOL_GPL(acpi_driver_match_device);
964
965/* --------------------------------------------------------------------------
966 ACPI Driver Management
967 -------------------------------------------------------------------------- */
968
969/**
970 * acpi_bus_register_driver - register a driver with the ACPI bus
971 * @driver: driver being registered
972 *
973 * Registers a driver with the ACPI bus. Searches the namespace for all
974 * devices that match the driver's criteria and binds. Returns zero for
975 * success or a negative error status for failure.
976 */
977int acpi_bus_register_driver(struct acpi_driver *driver)
978{
979 if (acpi_disabled)
980 return -ENODEV;
981 driver->drv.name = driver->name;
982 driver->drv.bus = &acpi_bus_type;
983 driver->drv.owner = driver->owner;
984
985 return driver_register(&driver->drv);
986}
987
988EXPORT_SYMBOL(acpi_bus_register_driver);
989
990/**
991 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
992 * @driver: driver to unregister
993 *
994 * Unregisters a driver with the ACPI bus. Searches the namespace for all
995 * devices that match the driver's criteria and unbinds.
996 */
997void acpi_bus_unregister_driver(struct acpi_driver *driver)
998{
999 driver_unregister(&driver->drv);
1000}
1001
1002EXPORT_SYMBOL(acpi_bus_unregister_driver);
1003
1004/* --------------------------------------------------------------------------
1005 ACPI Bus operations
1006 -------------------------------------------------------------------------- */
1007
1008static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1009{
1010 struct acpi_device *acpi_dev = to_acpi_device(dev);
1011 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1012
1013 return acpi_dev->flags.match_driver
1014 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1015}
1016
1017static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1018{
1019 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1020}
1021
1022static int acpi_device_probe(struct device *dev)
1023{
1024 struct acpi_device *acpi_dev = to_acpi_device(dev);
1025 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1026 int ret;
1027
1028 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1029 return -EINVAL;
1030
1031 if (!acpi_drv->ops.add)
1032 return -ENOSYS;
1033
1034 ret = acpi_drv->ops.add(acpi_dev);
1035 if (ret)
1036 return ret;
1037
1038 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1039 acpi_drv->name, acpi_dev->pnp.bus_id);
1040
1041 if (acpi_drv->ops.notify) {
1042 ret = acpi_device_install_notify_handler(acpi_dev);
1043 if (ret) {
1044 if (acpi_drv->ops.remove)
1045 acpi_drv->ops.remove(acpi_dev);
1046
1047 acpi_dev->driver_data = NULL;
1048 return ret;
1049 }
1050 }
1051
1052 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1053 acpi_dev->pnp.bus_id);
1054
1055 get_device(dev);
1056 return 0;
1057}
1058
1059static void acpi_device_remove(struct device *dev)
1060{
1061 struct acpi_device *acpi_dev = to_acpi_device(dev);
1062 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1063
1064 if (acpi_drv->ops.notify)
1065 acpi_device_remove_notify_handler(acpi_dev);
1066
1067 if (acpi_drv->ops.remove)
1068 acpi_drv->ops.remove(acpi_dev);
1069
1070 acpi_dev->driver_data = NULL;
1071
1072 put_device(dev);
1073}
1074
1075struct bus_type acpi_bus_type = {
1076 .name = "acpi",
1077 .match = acpi_bus_match,
1078 .probe = acpi_device_probe,
1079 .remove = acpi_device_remove,
1080 .uevent = acpi_device_uevent,
1081};
1082
1083int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1084{
1085 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1086}
1087EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1088
1089struct acpi_dev_walk_context {
1090 int (*fn)(struct acpi_device *, void *);
1091 void *data;
1092};
1093
1094static int acpi_dev_for_one_check(struct device *dev, void *context)
1095{
1096 struct acpi_dev_walk_context *adwc = context;
1097
1098 if (dev->bus != &acpi_bus_type)
1099 return 0;
1100
1101 return adwc->fn(to_acpi_device(dev), adwc->data);
1102}
1103EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1104
1105int acpi_dev_for_each_child(struct acpi_device *adev,
1106 int (*fn)(struct acpi_device *, void *), void *data)
1107{
1108 struct acpi_dev_walk_context adwc = {
1109 .fn = fn,
1110 .data = data,
1111 };
1112
1113 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1114}
1115
1116int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1117 int (*fn)(struct acpi_device *, void *),
1118 void *data)
1119{
1120 struct acpi_dev_walk_context adwc = {
1121 .fn = fn,
1122 .data = data,
1123 };
1124
1125 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1126}
1127
1128/* --------------------------------------------------------------------------
1129 Initialization/Cleanup
1130 -------------------------------------------------------------------------- */
1131
1132static int __init acpi_bus_init_irq(void)
1133{
1134 acpi_status status;
1135 char *message = NULL;
1136
1137
1138 /*
1139 * Let the system know what interrupt model we are using by
1140 * evaluating the \_PIC object, if exists.
1141 */
1142
1143 switch (acpi_irq_model) {
1144 case ACPI_IRQ_MODEL_PIC:
1145 message = "PIC";
1146 break;
1147 case ACPI_IRQ_MODEL_IOAPIC:
1148 message = "IOAPIC";
1149 break;
1150 case ACPI_IRQ_MODEL_IOSAPIC:
1151 message = "IOSAPIC";
1152 break;
1153 case ACPI_IRQ_MODEL_GIC:
1154 message = "GIC";
1155 break;
1156 case ACPI_IRQ_MODEL_PLATFORM:
1157 message = "platform specific model";
1158 break;
1159 case ACPI_IRQ_MODEL_LPIC:
1160 message = "LPIC";
1161 break;
1162 default:
1163 pr_info("Unknown interrupt routing model\n");
1164 return -ENODEV;
1165 }
1166
1167 pr_info("Using %s for interrupt routing\n", message);
1168
1169 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1170 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1171 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1172 return -ENODEV;
1173 }
1174
1175 return 0;
1176}
1177
1178/**
1179 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1180 *
1181 * The ACPI tables are accessible after this, but the handling of events has not
1182 * been initialized and the global lock is not available yet, so AML should not
1183 * be executed at this point.
1184 *
1185 * Doing this before switching the EFI runtime services to virtual mode allows
1186 * the EfiBootServices memory to be freed slightly earlier on boot.
1187 */
1188void __init acpi_early_init(void)
1189{
1190 acpi_status status;
1191
1192 if (acpi_disabled)
1193 return;
1194
1195 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1196
1197 /* enable workarounds, unless strict ACPI spec. compliance */
1198 if (!acpi_strict)
1199 acpi_gbl_enable_interpreter_slack = TRUE;
1200
1201 acpi_permanent_mmap = true;
1202
1203#ifdef CONFIG_X86
1204 /*
1205 * If the machine falls into the DMI check table,
1206 * DSDT will be copied to memory.
1207 * Note that calling dmi_check_system() here on other architectures
1208 * would not be OK because only x86 initializes dmi early enough.
1209 * Thankfully only x86 systems need such quirks for now.
1210 */
1211 dmi_check_system(dsdt_dmi_table);
1212#endif
1213
1214 status = acpi_reallocate_root_table();
1215 if (ACPI_FAILURE(status)) {
1216 pr_err("Unable to reallocate ACPI tables\n");
1217 goto error0;
1218 }
1219
1220 status = acpi_initialize_subsystem();
1221 if (ACPI_FAILURE(status)) {
1222 pr_err("Unable to initialize the ACPI Interpreter\n");
1223 goto error0;
1224 }
1225
1226#ifdef CONFIG_X86
1227 if (!acpi_ioapic) {
1228 /* compatible (0) means level (3) */
1229 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1230 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1231 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1232 }
1233 /* Set PIC-mode SCI trigger type */
1234 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1235 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1236 } else {
1237 /*
1238 * now that acpi_gbl_FADT is initialized,
1239 * update it with result from INT_SRC_OVR parsing
1240 */
1241 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1242 }
1243#endif
1244 return;
1245
1246 error0:
1247 disable_acpi();
1248}
1249
1250/**
1251 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1252 *
1253 * Switch over the platform to the ACPI mode (if possible).
1254 *
1255 * Doing this too early is generally unsafe, but at the same time it needs to be
1256 * done before all things that really depend on ACPI. The right spot appears to
1257 * be before finalizing the EFI initialization.
1258 */
1259void __init acpi_subsystem_init(void)
1260{
1261 acpi_status status;
1262
1263 if (acpi_disabled)
1264 return;
1265
1266 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1267 if (ACPI_FAILURE(status)) {
1268 pr_err("Unable to enable ACPI\n");
1269 disable_acpi();
1270 } else {
1271 /*
1272 * If the system is using ACPI then we can be reasonably
1273 * confident that any regulators are managed by the firmware
1274 * so tell the regulator core it has everything it needs to
1275 * know.
1276 */
1277 regulator_has_full_constraints();
1278 }
1279}
1280
1281static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1282{
1283 if (event == ACPI_TABLE_EVENT_LOAD)
1284 acpi_scan_table_notify();
1285
1286 return acpi_sysfs_table_handler(event, table, context);
1287}
1288
1289static int __init acpi_bus_init(void)
1290{
1291 int result;
1292 acpi_status status;
1293
1294 acpi_os_initialize1();
1295
1296 status = acpi_load_tables();
1297 if (ACPI_FAILURE(status)) {
1298 pr_err("Unable to load the System Description Tables\n");
1299 goto error1;
1300 }
1301
1302 /*
1303 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1304 * device is found in the namespace.
1305 *
1306 * This is accomplished by looking for the ECDT table and getting the EC
1307 * parameters out of that.
1308 *
1309 * Do that before calling acpi_initialize_objects() which may trigger EC
1310 * address space accesses.
1311 */
1312 acpi_ec_ecdt_probe();
1313
1314 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1315 if (ACPI_FAILURE(status)) {
1316 pr_err("Unable to start the ACPI Interpreter\n");
1317 goto error1;
1318 }
1319
1320 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1321 if (ACPI_FAILURE(status)) {
1322 pr_err("Unable to initialize ACPI objects\n");
1323 goto error1;
1324 }
1325
1326 /* Set capability bits for _OSC under processor scope */
1327 acpi_early_processor_osc();
1328
1329 /*
1330 * _OSC method may exist in module level code,
1331 * so it must be run after ACPI_FULL_INITIALIZATION
1332 */
1333 acpi_bus_osc_negotiate_platform_control();
1334 acpi_bus_osc_negotiate_usb_control();
1335
1336 /*
1337 * _PDC control method may load dynamic SSDT tables,
1338 * and we need to install the table handler before that.
1339 */
1340 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1341
1342 acpi_sysfs_init();
1343
1344 acpi_early_processor_set_pdc();
1345
1346 /*
1347 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1348 * is necessary to enable it as early as possible.
1349 */
1350 acpi_ec_dsdt_probe();
1351
1352 pr_info("Interpreter enabled\n");
1353
1354 /* Initialize sleep structures */
1355 acpi_sleep_init();
1356
1357 /*
1358 * Get the system interrupt model and evaluate \_PIC.
1359 */
1360 result = acpi_bus_init_irq();
1361 if (result)
1362 goto error1;
1363
1364 /*
1365 * Register the for all standard device notifications.
1366 */
1367 status =
1368 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1369 &acpi_bus_notify, NULL);
1370 if (ACPI_FAILURE(status)) {
1371 pr_err("Unable to register for system notifications\n");
1372 goto error1;
1373 }
1374
1375 /*
1376 * Create the top ACPI proc directory
1377 */
1378 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1379
1380 result = bus_register(&acpi_bus_type);
1381 if (!result)
1382 return 0;
1383
1384 /* Mimic structured exception handling */
1385 error1:
1386 acpi_terminate();
1387 return -ENODEV;
1388}
1389
1390struct kobject *acpi_kobj;
1391EXPORT_SYMBOL_GPL(acpi_kobj);
1392
1393static int __init acpi_init(void)
1394{
1395 int result;
1396
1397 if (acpi_disabled) {
1398 pr_info("Interpreter disabled.\n");
1399 return -ENODEV;
1400 }
1401
1402 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1403 if (!acpi_kobj)
1404 pr_debug("%s: kset create error\n", __func__);
1405
1406 init_prmt();
1407 acpi_init_pcc();
1408 result = acpi_bus_init();
1409 if (result) {
1410 kobject_put(acpi_kobj);
1411 disable_acpi();
1412 return result;
1413 }
1414 acpi_init_ffh();
1415
1416 pci_mmcfg_late_init();
1417 acpi_iort_init();
1418 acpi_viot_early_init();
1419 acpi_hest_init();
1420 acpi_ghes_init();
1421 acpi_scan_init();
1422 acpi_ec_init();
1423 acpi_debugfs_init();
1424 acpi_sleep_proc_init();
1425 acpi_wakeup_device_init();
1426 acpi_debugger_init();
1427 acpi_setup_sb_notify_handler();
1428 acpi_viot_init();
1429 acpi_agdi_init();
1430 acpi_apmt_init();
1431 return 0;
1432}
1433
1434subsys_initcall(acpi_init);