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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 const char *state_string(int state)
186{
187 switch (state) {
188 case ACPI_STATE_D0:
189 return "D0";
190 case ACPI_STATE_D1:
191 return "D1";
192 case ACPI_STATE_D2:
193 return "D2";
194 case ACPI_STATE_D3_HOT:
195 return "D3hot";
196 case ACPI_STATE_D3_COLD:
197 return "D3";
198 default:
199 return "(unknown)";
200 }
201}
202
203static int __acpi_bus_get_power(struct acpi_device *device, int *state)
204{
205 int result = ACPI_STATE_UNKNOWN;
206
207 if (!device || !state)
208 return -EINVAL;
209
210 if (!device->flags.power_manageable) {
211 /* TBD: Non-recursive algorithm for walking up hierarchy. */
212 *state = device->parent ?
213 device->parent->power.state : ACPI_STATE_D0;
214 goto out;
215 }
216
217 /*
218 * Get the device's power state either directly (via _PSC) or
219 * indirectly (via power resources).
220 */
221 if (device->power.flags.explicit_get) {
222 unsigned long long psc;
223 acpi_status status = acpi_evaluate_integer(device->handle,
224 "_PSC", NULL, &psc);
225 if (ACPI_FAILURE(status))
226 return -ENODEV;
227
228 result = psc;
229 }
230 /* The test below covers ACPI_STATE_UNKNOWN too. */
231 if (result <= ACPI_STATE_D2) {
232 ; /* Do nothing. */
233 } else if (device->power.flags.power_resources) {
234 int error = acpi_power_get_inferred_state(device, &result);
235 if (error)
236 return error;
237 } else if (result == ACPI_STATE_D3_HOT) {
238 result = ACPI_STATE_D3;
239 }
240
241 /*
242 * If we were unsure about the device parent's power state up to this
243 * point, the fact that the device is in D0 implies that the parent has
244 * to be in D0 too.
245 */
246 if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
247 && result == ACPI_STATE_D0)
248 device->parent->power.state = ACPI_STATE_D0;
249
250 *state = result;
251
252 out:
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
254 device->pnp.bus_id, state_string(*state)));
255
256 return 0;
257}
258
259
260static int __acpi_bus_set_power(struct acpi_device *device, int state)
261{
262 int result = 0;
263 acpi_status status = AE_OK;
264 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
265
266 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
267 return -EINVAL;
268
269 /* Make sure this is a valid target state */
270
271 if (state == device->power.state) {
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
273 state_string(state)));
274 return 0;
275 }
276
277 if (!device->power.states[state].flags.valid) {
278 printk(KERN_WARNING PREFIX "Device does not support %s\n",
279 state_string(state));
280 return -ENODEV;
281 }
282 if (device->parent && (state < device->parent->power.state)) {
283 printk(KERN_WARNING PREFIX
284 "Cannot set device to a higher-powered"
285 " state than parent\n");
286 return -ENODEV;
287 }
288
289 /* For D3cold we should execute _PS3, not _PS4. */
290 if (state == ACPI_STATE_D3_COLD)
291 object_name[3] = '3';
292
293 /*
294 * Transition Power
295 * ----------------
296 * On transitions to a high-powered state we first apply power (via
297 * power resources) then evalute _PSx. Conversly for transitions to
298 * a lower-powered state.
299 */
300 if (state < device->power.state) {
301 if (device->power.flags.power_resources) {
302 result = acpi_power_transition(device, state);
303 if (result)
304 goto end;
305 }
306 if (device->power.states[state].flags.explicit_set) {
307 status = acpi_evaluate_object(device->handle,
308 object_name, NULL, NULL);
309 if (ACPI_FAILURE(status)) {
310 result = -ENODEV;
311 goto end;
312 }
313 }
314 } else {
315 if (device->power.states[state].flags.explicit_set) {
316 status = acpi_evaluate_object(device->handle,
317 object_name, NULL, NULL);
318 if (ACPI_FAILURE(status)) {
319 result = -ENODEV;
320 goto end;
321 }
322 }
323 if (device->power.flags.power_resources) {
324 result = acpi_power_transition(device, state);
325 if (result)
326 goto end;
327 }
328 }
329
330 end:
331 if (result)
332 printk(KERN_WARNING PREFIX
333 "Device [%s] failed to transition to %s\n",
334 device->pnp.bus_id, state_string(state));
335 else {
336 device->power.state = state;
337 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
338 "Device [%s] transitioned to %s\n",
339 device->pnp.bus_id, state_string(state)));
340 }
341
342 return result;
343}
344
345
346int acpi_bus_set_power(acpi_handle handle, int state)
347{
348 struct acpi_device *device;
349 int result;
350
351 result = acpi_bus_get_device(handle, &device);
352 if (result)
353 return result;
354
355 if (!device->flags.power_manageable) {
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
357 "Device [%s] is not power manageable\n",
358 dev_name(&device->dev)));
359 return -ENODEV;
360 }
361
362 return __acpi_bus_set_power(device, state);
363}
364EXPORT_SYMBOL(acpi_bus_set_power);
365
366
367int acpi_bus_init_power(struct acpi_device *device)
368{
369 int state;
370 int result;
371
372 if (!device)
373 return -EINVAL;
374
375 device->power.state = ACPI_STATE_UNKNOWN;
376
377 result = __acpi_bus_get_power(device, &state);
378 if (result)
379 return result;
380
381 if (device->power.flags.power_resources)
382 result = acpi_power_on_resources(device, state);
383
384 if (!result)
385 device->power.state = state;
386
387 return result;
388}
389
390
391int acpi_bus_update_power(acpi_handle handle, int *state_p)
392{
393 struct acpi_device *device;
394 int state;
395 int result;
396
397 result = acpi_bus_get_device(handle, &device);
398 if (result)
399 return result;
400
401 result = __acpi_bus_get_power(device, &state);
402 if (result)
403 return result;
404
405 result = __acpi_bus_set_power(device, state);
406 if (!result && state_p)
407 *state_p = state;
408
409 return result;
410}
411EXPORT_SYMBOL_GPL(acpi_bus_update_power);
412
413
414bool acpi_bus_power_manageable(acpi_handle handle)
415{
416 struct acpi_device *device;
417 int result;
418
419 result = acpi_bus_get_device(handle, &device);
420 return result ? false : device->flags.power_manageable;
421}
422
423EXPORT_SYMBOL(acpi_bus_power_manageable);
424
425bool acpi_bus_can_wakeup(acpi_handle handle)
426{
427 struct acpi_device *device;
428 int result;
429
430 result = acpi_bus_get_device(handle, &device);
431 return result ? false : device->wakeup.flags.valid;
432}
433
434EXPORT_SYMBOL(acpi_bus_can_wakeup);
435
436static void acpi_print_osc_error(acpi_handle handle,
437 struct acpi_osc_context *context, char *error)
438{
439 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
440 int i;
441
442 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
443 printk(KERN_DEBUG "%s\n", error);
444 else {
445 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
446 kfree(buffer.pointer);
447 }
448 printk(KERN_DEBUG"_OSC request data:");
449 for (i = 0; i < context->cap.length; i += sizeof(u32))
450 printk("%x ", *((u32 *)(context->cap.pointer + i)));
451 printk("\n");
452}
453
454static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
455{
456 int i;
457 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
458 24, 26, 28, 30, 32, 34};
459
460 if (strlen(str) != 36)
461 return AE_BAD_PARAMETER;
462 for (i = 0; i < 36; i++) {
463 if (i == 8 || i == 13 || i == 18 || i == 23) {
464 if (str[i] != '-')
465 return AE_BAD_PARAMETER;
466 } else if (!isxdigit(str[i]))
467 return AE_BAD_PARAMETER;
468 }
469 for (i = 0; i < 16; i++) {
470 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
471 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
472 }
473 return AE_OK;
474}
475
476acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
477{
478 acpi_status status;
479 struct acpi_object_list input;
480 union acpi_object in_params[4];
481 union acpi_object *out_obj;
482 u8 uuid[16];
483 u32 errors;
484 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
485
486 if (!context)
487 return AE_ERROR;
488 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
489 return AE_ERROR;
490 context->ret.length = ACPI_ALLOCATE_BUFFER;
491 context->ret.pointer = NULL;
492
493 /* Setting up input parameters */
494 input.count = 4;
495 input.pointer = in_params;
496 in_params[0].type = ACPI_TYPE_BUFFER;
497 in_params[0].buffer.length = 16;
498 in_params[0].buffer.pointer = uuid;
499 in_params[1].type = ACPI_TYPE_INTEGER;
500 in_params[1].integer.value = context->rev;
501 in_params[2].type = ACPI_TYPE_INTEGER;
502 in_params[2].integer.value = context->cap.length/sizeof(u32);
503 in_params[3].type = ACPI_TYPE_BUFFER;
504 in_params[3].buffer.length = context->cap.length;
505 in_params[3].buffer.pointer = context->cap.pointer;
506
507 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
508 if (ACPI_FAILURE(status))
509 return status;
510
511 if (!output.length)
512 return AE_NULL_OBJECT;
513
514 out_obj = output.pointer;
515 if (out_obj->type != ACPI_TYPE_BUFFER
516 || out_obj->buffer.length != context->cap.length) {
517 acpi_print_osc_error(handle, context,
518 "_OSC evaluation returned wrong type");
519 status = AE_TYPE;
520 goto out_kfree;
521 }
522 /* Need to ignore the bit0 in result code */
523 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
524 if (errors) {
525 if (errors & OSC_REQUEST_ERROR)
526 acpi_print_osc_error(handle, context,
527 "_OSC request failed");
528 if (errors & OSC_INVALID_UUID_ERROR)
529 acpi_print_osc_error(handle, context,
530 "_OSC invalid UUID");
531 if (errors & OSC_INVALID_REVISION_ERROR)
532 acpi_print_osc_error(handle, context,
533 "_OSC invalid revision");
534 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
535 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
536 & OSC_QUERY_ENABLE)
537 goto out_success;
538 status = AE_SUPPORT;
539 goto out_kfree;
540 }
541 status = AE_ERROR;
542 goto out_kfree;
543 }
544out_success:
545 context->ret.length = out_obj->buffer.length;
546 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
547 if (!context->ret.pointer) {
548 status = AE_NO_MEMORY;
549 goto out_kfree;
550 }
551 memcpy(context->ret.pointer, out_obj->buffer.pointer,
552 context->ret.length);
553 status = AE_OK;
554
555out_kfree:
556 kfree(output.pointer);
557 if (status != AE_OK)
558 context->ret.pointer = NULL;
559 return status;
560}
561EXPORT_SYMBOL(acpi_run_osc);
562
563bool osc_sb_apei_support_acked;
564static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
565static void acpi_bus_osc_support(void)
566{
567 u32 capbuf[2];
568 struct acpi_osc_context context = {
569 .uuid_str = sb_uuid_str,
570 .rev = 1,
571 .cap.length = 8,
572 .cap.pointer = capbuf,
573 };
574 acpi_handle handle;
575
576 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
577 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
578#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
579 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
580 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
581#endif
582
583#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
584 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
585#endif
586
587 if (!ghes_disable)
588 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
589 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
590 return;
591 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
592 u32 *capbuf_ret = context.ret.pointer;
593 if (context.ret.length > OSC_SUPPORT_TYPE)
594 osc_sb_apei_support_acked =
595 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
596 kfree(context.ret.pointer);
597 }
598 /* do we need to check other returned cap? Sounds no */
599}
600
601/* --------------------------------------------------------------------------
602 Event Management
603 -------------------------------------------------------------------------- */
604
605#ifdef CONFIG_ACPI_PROC_EVENT
606static DEFINE_SPINLOCK(acpi_bus_event_lock);
607
608LIST_HEAD(acpi_bus_event_list);
609DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
610
611extern int event_is_open;
612
613int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
614{
615 struct acpi_bus_event *event;
616 unsigned long flags = 0;
617
618 /* drop event on the floor if no one's listening */
619 if (!event_is_open)
620 return 0;
621
622 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
623 if (!event)
624 return -ENOMEM;
625
626 strcpy(event->device_class, device_class);
627 strcpy(event->bus_id, bus_id);
628 event->type = type;
629 event->data = data;
630
631 spin_lock_irqsave(&acpi_bus_event_lock, flags);
632 list_add_tail(&event->node, &acpi_bus_event_list);
633 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
634
635 wake_up_interruptible(&acpi_bus_event_queue);
636
637 return 0;
638
639}
640
641EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
642
643int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
644{
645 if (!device)
646 return -EINVAL;
647 return acpi_bus_generate_proc_event4(device->pnp.device_class,
648 device->pnp.bus_id, type, data);
649}
650
651EXPORT_SYMBOL(acpi_bus_generate_proc_event);
652
653int acpi_bus_receive_event(struct acpi_bus_event *event)
654{
655 unsigned long flags = 0;
656 struct acpi_bus_event *entry = NULL;
657
658 DECLARE_WAITQUEUE(wait, current);
659
660
661 if (!event)
662 return -EINVAL;
663
664 if (list_empty(&acpi_bus_event_list)) {
665
666 set_current_state(TASK_INTERRUPTIBLE);
667 add_wait_queue(&acpi_bus_event_queue, &wait);
668
669 if (list_empty(&acpi_bus_event_list))
670 schedule();
671
672 remove_wait_queue(&acpi_bus_event_queue, &wait);
673 set_current_state(TASK_RUNNING);
674
675 if (signal_pending(current))
676 return -ERESTARTSYS;
677 }
678
679 spin_lock_irqsave(&acpi_bus_event_lock, flags);
680 if (!list_empty(&acpi_bus_event_list)) {
681 entry = list_entry(acpi_bus_event_list.next,
682 struct acpi_bus_event, node);
683 list_del(&entry->node);
684 }
685 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
686
687 if (!entry)
688 return -ENODEV;
689
690 memcpy(event, entry, sizeof(struct acpi_bus_event));
691
692 kfree(entry);
693
694 return 0;
695}
696
697#endif /* CONFIG_ACPI_PROC_EVENT */
698
699/* --------------------------------------------------------------------------
700 Notification Handling
701 -------------------------------------------------------------------------- */
702
703static void acpi_bus_check_device(acpi_handle handle)
704{
705 struct acpi_device *device;
706 acpi_status status;
707 struct acpi_device_status old_status;
708
709 if (acpi_bus_get_device(handle, &device))
710 return;
711 if (!device)
712 return;
713
714 old_status = device->status;
715
716 /*
717 * Make sure this device's parent is present before we go about
718 * messing with the device.
719 */
720 if (device->parent && !device->parent->status.present) {
721 device->status = device->parent->status;
722 return;
723 }
724
725 status = acpi_bus_get_status(device);
726 if (ACPI_FAILURE(status))
727 return;
728
729 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
730 return;
731
732 /*
733 * Device Insertion/Removal
734 */
735 if ((device->status.present) && !(old_status.present)) {
736 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
737 /* TBD: Handle device insertion */
738 } else if (!(device->status.present) && (old_status.present)) {
739 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
740 /* TBD: Handle device removal */
741 }
742}
743
744static void acpi_bus_check_scope(acpi_handle handle)
745{
746 /* Status Change? */
747 acpi_bus_check_device(handle);
748
749 /*
750 * TBD: Enumerate child devices within this device's scope and
751 * run acpi_bus_check_device()'s on them.
752 */
753}
754
755static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
756int register_acpi_bus_notifier(struct notifier_block *nb)
757{
758 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
759}
760EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
761
762void unregister_acpi_bus_notifier(struct notifier_block *nb)
763{
764 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
765}
766EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
767
768/**
769 * acpi_bus_notify
770 * ---------------
771 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
772 */
773static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
774{
775 struct acpi_device *device = NULL;
776 struct acpi_driver *driver;
777
778 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
779 type, handle));
780
781 blocking_notifier_call_chain(&acpi_bus_notify_list,
782 type, (void *)handle);
783
784 switch (type) {
785
786 case ACPI_NOTIFY_BUS_CHECK:
787 acpi_bus_check_scope(handle);
788 /*
789 * TBD: We'll need to outsource certain events to non-ACPI
790 * drivers via the device manager (device.c).
791 */
792 break;
793
794 case ACPI_NOTIFY_DEVICE_CHECK:
795 acpi_bus_check_device(handle);
796 /*
797 * TBD: We'll need to outsource certain events to non-ACPI
798 * drivers via the device manager (device.c).
799 */
800 break;
801
802 case ACPI_NOTIFY_DEVICE_WAKE:
803 /* TBD */
804 break;
805
806 case ACPI_NOTIFY_EJECT_REQUEST:
807 /* TBD */
808 break;
809
810 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
811 /* TBD: Exactly what does 'light' mean? */
812 break;
813
814 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
815 /* TBD */
816 break;
817
818 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
819 /* TBD */
820 break;
821
822 case ACPI_NOTIFY_POWER_FAULT:
823 /* TBD */
824 break;
825
826 default:
827 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
828 "Received unknown/unsupported notification [%08x]\n",
829 type));
830 break;
831 }
832
833 acpi_bus_get_device(handle, &device);
834 if (device) {
835 driver = device->driver;
836 if (driver && driver->ops.notify &&
837 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
838 driver->ops.notify(device, type);
839 }
840}
841
842/* --------------------------------------------------------------------------
843 Initialization/Cleanup
844 -------------------------------------------------------------------------- */
845
846static int __init acpi_bus_init_irq(void)
847{
848 acpi_status status = AE_OK;
849 union acpi_object arg = { ACPI_TYPE_INTEGER };
850 struct acpi_object_list arg_list = { 1, &arg };
851 char *message = NULL;
852
853
854 /*
855 * Let the system know what interrupt model we are using by
856 * evaluating the \_PIC object, if exists.
857 */
858
859 switch (acpi_irq_model) {
860 case ACPI_IRQ_MODEL_PIC:
861 message = "PIC";
862 break;
863 case ACPI_IRQ_MODEL_IOAPIC:
864 message = "IOAPIC";
865 break;
866 case ACPI_IRQ_MODEL_IOSAPIC:
867 message = "IOSAPIC";
868 break;
869 case ACPI_IRQ_MODEL_PLATFORM:
870 message = "platform specific model";
871 break;
872 default:
873 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
874 return -ENODEV;
875 }
876
877 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
878
879 arg.integer.value = acpi_irq_model;
880
881 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
882 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
883 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
884 return -ENODEV;
885 }
886
887 return 0;
888}
889
890u8 acpi_gbl_permanent_mmap;
891
892
893void __init acpi_early_init(void)
894{
895 acpi_status status = AE_OK;
896
897 if (acpi_disabled)
898 return;
899
900 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
901
902 /* enable workarounds, unless strict ACPI spec. compliance */
903 if (!acpi_strict)
904 acpi_gbl_enable_interpreter_slack = TRUE;
905
906 acpi_gbl_permanent_mmap = 1;
907
908 /*
909 * If the machine falls into the DMI check table,
910 * DSDT will be copied to memory
911 */
912 dmi_check_system(dsdt_dmi_table);
913
914 status = acpi_reallocate_root_table();
915 if (ACPI_FAILURE(status)) {
916 printk(KERN_ERR PREFIX
917 "Unable to reallocate ACPI tables\n");
918 goto error0;
919 }
920
921 status = acpi_initialize_subsystem();
922 if (ACPI_FAILURE(status)) {
923 printk(KERN_ERR PREFIX
924 "Unable to initialize the ACPI Interpreter\n");
925 goto error0;
926 }
927
928 status = acpi_load_tables();
929 if (ACPI_FAILURE(status)) {
930 printk(KERN_ERR PREFIX
931 "Unable to load the System Description Tables\n");
932 goto error0;
933 }
934
935#ifdef CONFIG_X86
936 if (!acpi_ioapic) {
937 /* compatible (0) means level (3) */
938 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
939 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
940 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
941 }
942 /* Set PIC-mode SCI trigger type */
943 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
944 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
945 } else {
946 /*
947 * now that acpi_gbl_FADT is initialized,
948 * update it with result from INT_SRC_OVR parsing
949 */
950 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
951 }
952#endif
953
954 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
955 if (ACPI_FAILURE(status)) {
956 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
957 goto error0;
958 }
959
960 return;
961
962 error0:
963 disable_acpi();
964 return;
965}
966
967static int __init acpi_bus_init(void)
968{
969 int result = 0;
970 acpi_status status = AE_OK;
971 extern acpi_status acpi_os_initialize1(void);
972
973 acpi_os_initialize1();
974
975 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
976 if (ACPI_FAILURE(status)) {
977 printk(KERN_ERR PREFIX
978 "Unable to start the ACPI Interpreter\n");
979 goto error1;
980 }
981
982 /*
983 * ACPI 2.0 requires the EC driver to be loaded and work before
984 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
985 * is called).
986 *
987 * This is accomplished by looking for the ECDT table, and getting
988 * the EC parameters out of that.
989 */
990 status = acpi_ec_ecdt_probe();
991 /* Ignore result. Not having an ECDT is not fatal. */
992
993 acpi_bus_osc_support();
994
995 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
996 if (ACPI_FAILURE(status)) {
997 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
998 goto error1;
999 }
1000
1001 /*
1002 * _PDC control method may load dynamic SSDT tables,
1003 * and we need to install the table handler before that.
1004 */
1005 acpi_sysfs_init();
1006
1007 acpi_early_processor_set_pdc();
1008
1009 /*
1010 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1011 * is necessary to enable it as early as possible.
1012 */
1013 acpi_boot_ec_enable();
1014
1015 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1016
1017 /* Initialize sleep structures */
1018 acpi_sleep_init();
1019
1020 /*
1021 * Get the system interrupt model and evaluate \_PIC.
1022 */
1023 result = acpi_bus_init_irq();
1024 if (result)
1025 goto error1;
1026
1027 /*
1028 * Register the for all standard device notifications.
1029 */
1030 status =
1031 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1032 &acpi_bus_notify, NULL);
1033 if (ACPI_FAILURE(status)) {
1034 printk(KERN_ERR PREFIX
1035 "Unable to register for device notifications\n");
1036 goto error1;
1037 }
1038
1039 /*
1040 * Create the top ACPI proc directory
1041 */
1042 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1043
1044 return 0;
1045
1046 /* Mimic structured exception handling */
1047 error1:
1048 acpi_terminate();
1049 return -ENODEV;
1050}
1051
1052struct kobject *acpi_kobj;
1053EXPORT_SYMBOL_GPL(acpi_kobj);
1054
1055static int __init acpi_init(void)
1056{
1057 int result;
1058
1059 if (acpi_disabled) {
1060 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1061 return -ENODEV;
1062 }
1063
1064 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1065 if (!acpi_kobj) {
1066 printk(KERN_WARNING "%s: kset create error\n", __func__);
1067 acpi_kobj = NULL;
1068 }
1069
1070 init_acpi_device_notify();
1071 result = acpi_bus_init();
1072 if (result) {
1073 disable_acpi();
1074 return result;
1075 }
1076
1077 pci_mmcfg_late_init();
1078 acpi_scan_init();
1079 acpi_ec_init();
1080 acpi_debugfs_init();
1081 acpi_sleep_proc_init();
1082 acpi_wakeup_device_init();
1083 return 0;
1084}
1085
1086subsys_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_viot.h>
30#include <linux/pci.h>
31#include <acpi/apei.h>
32#include <linux/suspend.h>
33#include <linux/prmt.h>
34
35#include "internal.h"
36
37struct acpi_device *acpi_root;
38struct proc_dir_entry *acpi_root_dir;
39EXPORT_SYMBOL(acpi_root_dir);
40
41#ifdef CONFIG_X86
42#ifdef CONFIG_ACPI_CUSTOM_DSDT
43static inline int set_copy_dsdt(const struct dmi_system_id *id)
44{
45 return 0;
46}
47#else
48static int set_copy_dsdt(const struct dmi_system_id *id)
49{
50 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
51 acpi_gbl_copy_dsdt_locally = 1;
52 return 0;
53}
54#endif
55
56static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
57 /*
58 * Invoke DSDT corruption work-around on all Toshiba Satellite.
59 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
60 */
61 {
62 .callback = set_copy_dsdt,
63 .ident = "TOSHIBA Satellite",
64 .matches = {
65 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
66 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
67 },
68 },
69 {}
70};
71#endif
72
73/* --------------------------------------------------------------------------
74 Device Management
75 -------------------------------------------------------------------------- */
76
77acpi_status acpi_bus_get_status_handle(acpi_handle handle,
78 unsigned long long *sta)
79{
80 acpi_status status;
81
82 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
83 if (ACPI_SUCCESS(status))
84 return AE_OK;
85
86 if (status == AE_NOT_FOUND) {
87 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
88 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
89 return AE_OK;
90 }
91 return status;
92}
93EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
94
95int acpi_bus_get_status(struct acpi_device *device)
96{
97 acpi_status status;
98 unsigned long long sta;
99
100 if (acpi_device_override_status(device, &sta)) {
101 acpi_set_device_status(device, sta);
102 return 0;
103 }
104
105 /* Battery devices must have their deps met before calling _STA */
106 if (acpi_device_is_battery(device) && device->dep_unmet) {
107 acpi_set_device_status(device, 0);
108 return 0;
109 }
110
111 status = acpi_bus_get_status_handle(device->handle, &sta);
112 if (ACPI_FAILURE(status))
113 return -ENODEV;
114
115 acpi_set_device_status(device, sta);
116
117 if (device->status.functional && !device->status.present) {
118 pr_debug("Device [%s] status [%08x]: functional but not present\n",
119 device->pnp.bus_id, (u32)sta);
120 }
121
122 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
123 return 0;
124}
125EXPORT_SYMBOL(acpi_bus_get_status);
126
127void acpi_bus_private_data_handler(acpi_handle handle,
128 void *context)
129{
130 return;
131}
132EXPORT_SYMBOL(acpi_bus_private_data_handler);
133
134int acpi_bus_attach_private_data(acpi_handle handle, void *data)
135{
136 acpi_status status;
137
138 status = acpi_attach_data(handle,
139 acpi_bus_private_data_handler, data);
140 if (ACPI_FAILURE(status)) {
141 acpi_handle_debug(handle, "Error attaching device data\n");
142 return -ENODEV;
143 }
144
145 return 0;
146}
147EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
148
149int acpi_bus_get_private_data(acpi_handle handle, void **data)
150{
151 acpi_status status;
152
153 if (!data)
154 return -EINVAL;
155
156 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
157 if (ACPI_FAILURE(status)) {
158 acpi_handle_debug(handle, "No context for object\n");
159 return -ENODEV;
160 }
161
162 return 0;
163}
164EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
165
166void acpi_bus_detach_private_data(acpi_handle handle)
167{
168 acpi_detach_data(handle, acpi_bus_private_data_handler);
169}
170EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
171
172static void acpi_print_osc_error(acpi_handle handle,
173 struct acpi_osc_context *context, char *error)
174{
175 int i;
176
177 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
178
179 pr_debug("_OSC request data:");
180 for (i = 0; i < context->cap.length; i += sizeof(u32))
181 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
182
183 pr_debug("\n");
184}
185
186acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
187{
188 acpi_status status;
189 struct acpi_object_list input;
190 union acpi_object in_params[4];
191 union acpi_object *out_obj;
192 guid_t guid;
193 u32 errors;
194 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
195
196 if (!context)
197 return AE_ERROR;
198 if (guid_parse(context->uuid_str, &guid))
199 return AE_ERROR;
200 context->ret.length = ACPI_ALLOCATE_BUFFER;
201 context->ret.pointer = NULL;
202
203 /* Setting up input parameters */
204 input.count = 4;
205 input.pointer = in_params;
206 in_params[0].type = ACPI_TYPE_BUFFER;
207 in_params[0].buffer.length = 16;
208 in_params[0].buffer.pointer = (u8 *)&guid;
209 in_params[1].type = ACPI_TYPE_INTEGER;
210 in_params[1].integer.value = context->rev;
211 in_params[2].type = ACPI_TYPE_INTEGER;
212 in_params[2].integer.value = context->cap.length/sizeof(u32);
213 in_params[3].type = ACPI_TYPE_BUFFER;
214 in_params[3].buffer.length = context->cap.length;
215 in_params[3].buffer.pointer = context->cap.pointer;
216
217 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
218 if (ACPI_FAILURE(status))
219 return status;
220
221 if (!output.length)
222 return AE_NULL_OBJECT;
223
224 out_obj = output.pointer;
225 if (out_obj->type != ACPI_TYPE_BUFFER
226 || out_obj->buffer.length != context->cap.length) {
227 acpi_print_osc_error(handle, context,
228 "_OSC evaluation returned wrong type");
229 status = AE_TYPE;
230 goto out_kfree;
231 }
232 /* Need to ignore the bit0 in result code */
233 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
234 if (errors) {
235 if (errors & OSC_REQUEST_ERROR)
236 acpi_print_osc_error(handle, context,
237 "_OSC request failed");
238 if (errors & OSC_INVALID_UUID_ERROR)
239 acpi_print_osc_error(handle, context,
240 "_OSC invalid UUID");
241 if (errors & OSC_INVALID_REVISION_ERROR)
242 acpi_print_osc_error(handle, context,
243 "_OSC invalid revision");
244 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
245 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
246 & OSC_QUERY_ENABLE)
247 goto out_success;
248 status = AE_SUPPORT;
249 goto out_kfree;
250 }
251 status = AE_ERROR;
252 goto out_kfree;
253 }
254out_success:
255 context->ret.length = out_obj->buffer.length;
256 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
257 context->ret.length, GFP_KERNEL);
258 if (!context->ret.pointer) {
259 status = AE_NO_MEMORY;
260 goto out_kfree;
261 }
262 status = AE_OK;
263
264out_kfree:
265 kfree(output.pointer);
266 return status;
267}
268EXPORT_SYMBOL(acpi_run_osc);
269
270bool osc_sb_apei_support_acked;
271
272/*
273 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
274 * OSPM supports platform coordinated low power idle(LPI) states
275 */
276bool osc_pc_lpi_support_confirmed;
277EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
278
279/*
280 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
281 * Starting with ACPI Specification 6.2, all _CPC registers can be in
282 * PCC, System Memory, System IO, or Functional Fixed Hardware address
283 * spaces. OSPM support for this more flexible register space scheme is
284 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
285 *
286 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
287 * - PCC or Functional Fixed Hardware address space if defined
288 * - SystemMemory address space (NULL register) if not defined
289 */
290bool osc_cpc_flexible_adr_space_confirmed;
291EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
292
293/*
294 * ACPI 6.4 Operating System Capabilities for USB.
295 */
296bool osc_sb_native_usb4_support_confirmed;
297EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
298
299bool osc_sb_cppc2_support_acked;
300
301static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
302static void acpi_bus_osc_negotiate_platform_control(void)
303{
304 u32 capbuf[2], *capbuf_ret;
305 struct acpi_osc_context context = {
306 .uuid_str = sb_uuid_str,
307 .rev = 1,
308 .cap.length = 8,
309 .cap.pointer = capbuf,
310 };
311 acpi_handle handle;
312
313 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
314 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
315 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
316 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
317 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
319 if (IS_ENABLED(CONFIG_ACPI_THERMAL))
320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
321
322 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_OVER_16_PSTATES_SUPPORT;
325 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GED_SUPPORT;
326 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT;
327 if (IS_ENABLED(CONFIG_ACPI_PRMT))
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
329 if (IS_ENABLED(CONFIG_ACPI_FFH))
330 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
331
332#ifdef CONFIG_ARM64
333 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
334#endif
335#ifdef CONFIG_X86
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
337#endif
338
339#ifdef CONFIG_ACPI_CPPC_LIB
340 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
341 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
342#endif
343
344 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
345
346 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
347 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
348
349 if (IS_ENABLED(CONFIG_USB4))
350 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
351
352 if (!ghes_disable)
353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
354 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
355 return;
356
357 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
358 return;
359
360 capbuf_ret = context.ret.pointer;
361 if (context.ret.length <= OSC_SUPPORT_DWORD) {
362 kfree(context.ret.pointer);
363 return;
364 }
365
366 /*
367 * Now run _OSC again with query flag clear and with the caps
368 * supported by both the OS and the platform.
369 */
370 capbuf[OSC_QUERY_DWORD] = 0;
371 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
372 kfree(context.ret.pointer);
373
374 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
375 return;
376
377 capbuf_ret = context.ret.pointer;
378 if (context.ret.length > OSC_SUPPORT_DWORD) {
379#ifdef CONFIG_ACPI_CPPC_LIB
380 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
381#endif
382
383 osc_sb_apei_support_acked =
384 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
385 osc_pc_lpi_support_confirmed =
386 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
387 osc_sb_native_usb4_support_confirmed =
388 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
389 osc_cpc_flexible_adr_space_confirmed =
390 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
391 }
392
393 kfree(context.ret.pointer);
394}
395
396/*
397 * Native control of USB4 capabilities. If any of the tunneling bits is
398 * set it means OS is in control and we use software based connection
399 * manager.
400 */
401u32 osc_sb_native_usb4_control;
402EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
403
404static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
405{
406 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
407 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
408 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
409 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
410 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
411}
412
413static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
414static void acpi_bus_osc_negotiate_usb_control(void)
415{
416 u32 capbuf[3], *capbuf_ret;
417 struct acpi_osc_context context = {
418 .uuid_str = sb_usb_uuid_str,
419 .rev = 1,
420 .cap.length = sizeof(capbuf),
421 .cap.pointer = capbuf,
422 };
423 acpi_handle handle;
424 acpi_status status;
425 u32 control;
426
427 if (!osc_sb_native_usb4_support_confirmed)
428 return;
429
430 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
431 return;
432
433 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
434 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
435
436 /*
437 * Run _OSC first with query bit set, trying to get control over
438 * all tunneling. The platform can then clear out bits in the
439 * control dword that it does not want to grant to the OS.
440 */
441 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
442 capbuf[OSC_SUPPORT_DWORD] = 0;
443 capbuf[OSC_CONTROL_DWORD] = control;
444
445 status = acpi_run_osc(handle, &context);
446 if (ACPI_FAILURE(status))
447 return;
448
449 if (context.ret.length != sizeof(capbuf)) {
450 pr_info("USB4 _OSC: returned invalid length buffer\n");
451 goto out_free;
452 }
453
454 /*
455 * Run _OSC again now with query bit clear and the control dword
456 * matching what the platform granted (which may not have all
457 * the control bits set).
458 */
459 capbuf_ret = context.ret.pointer;
460
461 capbuf[OSC_QUERY_DWORD] = 0;
462 capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];
463
464 kfree(context.ret.pointer);
465
466 status = acpi_run_osc(handle, &context);
467 if (ACPI_FAILURE(status))
468 return;
469
470 if (context.ret.length != sizeof(capbuf)) {
471 pr_info("USB4 _OSC: returned invalid length buffer\n");
472 goto out_free;
473 }
474
475 osc_sb_native_usb4_control =
476 control & acpi_osc_ctx_get_pci_control(&context);
477
478 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
479 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
480 osc_sb_native_usb4_control);
481
482out_free:
483 kfree(context.ret.pointer);
484}
485
486/* --------------------------------------------------------------------------
487 Notification Handling
488 -------------------------------------------------------------------------- */
489
490/**
491 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
492 * @handle: Target ACPI object.
493 * @type: Notification type.
494 * @data: Ignored.
495 *
496 * This only handles notifications related to device hotplug.
497 */
498static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
499{
500 struct acpi_device *adev;
501
502 switch (type) {
503 case ACPI_NOTIFY_BUS_CHECK:
504 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
505 break;
506
507 case ACPI_NOTIFY_DEVICE_CHECK:
508 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
509 break;
510
511 case ACPI_NOTIFY_DEVICE_WAKE:
512 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
513 return;
514
515 case ACPI_NOTIFY_EJECT_REQUEST:
516 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
517 break;
518
519 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
520 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
521 /* TBD: Exactly what does 'light' mean? */
522 return;
523
524 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
525 acpi_handle_err(handle, "Device cannot be configured due "
526 "to a frequency mismatch\n");
527 return;
528
529 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
530 acpi_handle_err(handle, "Device cannot be configured due "
531 "to a bus mode mismatch\n");
532 return;
533
534 case ACPI_NOTIFY_POWER_FAULT:
535 acpi_handle_err(handle, "Device has suffered a power fault\n");
536 return;
537
538 default:
539 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
540 return;
541 }
542
543 adev = acpi_get_acpi_dev(handle);
544
545 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
546 return;
547
548 acpi_put_acpi_dev(adev);
549
550 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
551}
552
553static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
554{
555 struct acpi_device *device = data;
556 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
557
558 acpi_drv->ops.notify(device, event);
559}
560
561static int acpi_device_install_notify_handler(struct acpi_device *device,
562 struct acpi_driver *acpi_drv)
563{
564 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
565 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
566 acpi_status status;
567
568 status = acpi_install_notify_handler(device->handle, type,
569 acpi_notify_device, device);
570 if (ACPI_FAILURE(status))
571 return -EINVAL;
572
573 return 0;
574}
575
576static void acpi_device_remove_notify_handler(struct acpi_device *device,
577 struct acpi_driver *acpi_drv)
578{
579 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
580 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
581
582 acpi_remove_notify_handler(device->handle, type,
583 acpi_notify_device);
584
585 acpi_os_wait_events_complete();
586}
587
588int acpi_dev_install_notify_handler(struct acpi_device *adev,
589 u32 handler_type,
590 acpi_notify_handler handler, void *context)
591{
592 acpi_status status;
593
594 status = acpi_install_notify_handler(adev->handle, handler_type,
595 handler, context);
596 if (ACPI_FAILURE(status))
597 return -ENODEV;
598
599 return 0;
600}
601EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
602
603void acpi_dev_remove_notify_handler(struct acpi_device *adev,
604 u32 handler_type,
605 acpi_notify_handler handler)
606{
607 acpi_remove_notify_handler(adev->handle, handler_type, handler);
608 acpi_os_wait_events_complete();
609}
610EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
611
612/* Handle events targeting \_SB device (at present only graceful shutdown) */
613
614#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
615#define ACPI_SB_INDICATE_INTERVAL 10000
616
617static void sb_notify_work(struct work_struct *dummy)
618{
619 acpi_handle sb_handle;
620
621 orderly_poweroff(true);
622
623 /*
624 * After initiating graceful shutdown, the ACPI spec requires OSPM
625 * to evaluate _OST method once every 10seconds to indicate that
626 * the shutdown is in progress
627 */
628 acpi_get_handle(NULL, "\\_SB", &sb_handle);
629 while (1) {
630 pr_info("Graceful shutdown in progress.\n");
631 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
632 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
633 msleep(ACPI_SB_INDICATE_INTERVAL);
634 }
635}
636
637static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
638{
639 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
640
641 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
642 if (!work_busy(&acpi_sb_work))
643 schedule_work(&acpi_sb_work);
644 } else {
645 pr_warn("event %x is not supported by \\_SB device\n", event);
646 }
647}
648
649static int __init acpi_setup_sb_notify_handler(void)
650{
651 acpi_handle sb_handle;
652
653 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
654 return -ENXIO;
655
656 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
657 acpi_sb_notify, NULL)))
658 return -EINVAL;
659
660 return 0;
661}
662
663/* --------------------------------------------------------------------------
664 Device Matching
665 -------------------------------------------------------------------------- */
666
667/**
668 * acpi_get_first_physical_node - Get first physical node of an ACPI device
669 * @adev: ACPI device in question
670 *
671 * Return: First physical node of ACPI device @adev
672 */
673struct device *acpi_get_first_physical_node(struct acpi_device *adev)
674{
675 struct mutex *physical_node_lock = &adev->physical_node_lock;
676 struct device *phys_dev;
677
678 mutex_lock(physical_node_lock);
679 if (list_empty(&adev->physical_node_list)) {
680 phys_dev = NULL;
681 } else {
682 const struct acpi_device_physical_node *node;
683
684 node = list_first_entry(&adev->physical_node_list,
685 struct acpi_device_physical_node, node);
686
687 phys_dev = node->dev;
688 }
689 mutex_unlock(physical_node_lock);
690 return phys_dev;
691}
692EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
693
694static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
695 const struct device *dev)
696{
697 const struct device *phys_dev = acpi_get_first_physical_node(adev);
698
699 return phys_dev && phys_dev == dev ? adev : NULL;
700}
701
702/**
703 * acpi_device_is_first_physical_node - Is given dev first physical node
704 * @adev: ACPI companion device
705 * @dev: Physical device to check
706 *
707 * Function checks if given @dev is the first physical devices attached to
708 * the ACPI companion device. This distinction is needed in some cases
709 * where the same companion device is shared between many physical devices.
710 *
711 * Note that the caller have to provide valid @adev pointer.
712 */
713bool acpi_device_is_first_physical_node(struct acpi_device *adev,
714 const struct device *dev)
715{
716 return !!acpi_primary_dev_companion(adev, dev);
717}
718
719/*
720 * acpi_companion_match() - Can we match via ACPI companion device
721 * @dev: Device in question
722 *
723 * Check if the given device has an ACPI companion and if that companion has
724 * a valid list of PNP IDs, and if the device is the first (primary) physical
725 * device associated with it. Return the companion pointer if that's the case
726 * or NULL otherwise.
727 *
728 * If multiple physical devices are attached to a single ACPI companion, we need
729 * to be careful. The usage scenario for this kind of relationship is that all
730 * of the physical devices in question use resources provided by the ACPI
731 * companion. A typical case is an MFD device where all the sub-devices share
732 * the parent's ACPI companion. In such cases we can only allow the primary
733 * (first) physical device to be matched with the help of the companion's PNP
734 * IDs.
735 *
736 * Additional physical devices sharing the ACPI companion can still use
737 * resources available from it but they will be matched normally using functions
738 * provided by their bus types (and analogously for their modalias).
739 */
740const struct acpi_device *acpi_companion_match(const struct device *dev)
741{
742 struct acpi_device *adev;
743
744 adev = ACPI_COMPANION(dev);
745 if (!adev)
746 return NULL;
747
748 if (list_empty(&adev->pnp.ids))
749 return NULL;
750
751 return acpi_primary_dev_companion(adev, dev);
752}
753
754/**
755 * acpi_of_match_device - Match device object using the "compatible" property.
756 * @adev: ACPI device object to match.
757 * @of_match_table: List of device IDs to match against.
758 * @of_id: OF ID if matched
759 *
760 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
761 * identifiers and a _DSD object with the "compatible" property, use that
762 * property to match against the given list of identifiers.
763 */
764static bool acpi_of_match_device(const struct acpi_device *adev,
765 const struct of_device_id *of_match_table,
766 const struct of_device_id **of_id)
767{
768 const union acpi_object *of_compatible, *obj;
769 int i, nval;
770
771 if (!adev)
772 return false;
773
774 of_compatible = adev->data.of_compatible;
775 if (!of_match_table || !of_compatible)
776 return false;
777
778 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
779 nval = of_compatible->package.count;
780 obj = of_compatible->package.elements;
781 } else { /* Must be ACPI_TYPE_STRING. */
782 nval = 1;
783 obj = of_compatible;
784 }
785 /* Now we can look for the driver DT compatible strings */
786 for (i = 0; i < nval; i++, obj++) {
787 const struct of_device_id *id;
788
789 for (id = of_match_table; id->compatible[0]; id++)
790 if (!strcasecmp(obj->string.pointer, id->compatible)) {
791 if (of_id)
792 *of_id = id;
793 return true;
794 }
795 }
796
797 return false;
798}
799
800static bool acpi_of_modalias(struct acpi_device *adev,
801 char *modalias, size_t len)
802{
803 const union acpi_object *of_compatible;
804 const union acpi_object *obj;
805 const char *str, *chr;
806
807 of_compatible = adev->data.of_compatible;
808 if (!of_compatible)
809 return false;
810
811 if (of_compatible->type == ACPI_TYPE_PACKAGE)
812 obj = of_compatible->package.elements;
813 else /* Must be ACPI_TYPE_STRING. */
814 obj = of_compatible;
815
816 str = obj->string.pointer;
817 chr = strchr(str, ',');
818 strscpy(modalias, chr ? chr + 1 : str, len);
819
820 return true;
821}
822
823/**
824 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
825 * @adev: ACPI device object to match
826 * @default_id: ID string to use as default if no compatible string found
827 * @modalias: Pointer to buffer that modalias value will be copied into
828 * @len: Length of modalias buffer
829 *
830 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
831 * objects. If there is a compatible string for @adev, it will be copied to
832 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
833 * used.
834 */
835void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
836 char *modalias, size_t len)
837{
838 if (!acpi_of_modalias(adev, modalias, len))
839 strscpy(modalias, default_id, len);
840}
841EXPORT_SYMBOL_GPL(acpi_set_modalias);
842
843static bool __acpi_match_device_cls(const struct acpi_device_id *id,
844 struct acpi_hardware_id *hwid)
845{
846 int i, msk, byte_shift;
847 char buf[3];
848
849 if (!id->cls)
850 return false;
851
852 /* Apply class-code bitmask, before checking each class-code byte */
853 for (i = 1; i <= 3; i++) {
854 byte_shift = 8 * (3 - i);
855 msk = (id->cls_msk >> byte_shift) & 0xFF;
856 if (!msk)
857 continue;
858
859 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
860 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
861 return false;
862 }
863 return true;
864}
865
866static bool __acpi_match_device(const struct acpi_device *device,
867 const struct acpi_device_id *acpi_ids,
868 const struct of_device_id *of_ids,
869 const struct acpi_device_id **acpi_id,
870 const struct of_device_id **of_id)
871{
872 const struct acpi_device_id *id;
873 struct acpi_hardware_id *hwid;
874
875 /*
876 * If the device is not present, it is unnecessary to load device
877 * driver for it.
878 */
879 if (!device || !device->status.present)
880 return false;
881
882 list_for_each_entry(hwid, &device->pnp.ids, list) {
883 /* First, check the ACPI/PNP IDs provided by the caller. */
884 if (acpi_ids) {
885 for (id = acpi_ids; id->id[0] || id->cls; id++) {
886 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
887 goto out_acpi_match;
888 if (id->cls && __acpi_match_device_cls(id, hwid))
889 goto out_acpi_match;
890 }
891 }
892
893 /*
894 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
895 * "compatible" property if found.
896 */
897 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
898 return acpi_of_match_device(device, of_ids, of_id);
899 }
900 return false;
901
902out_acpi_match:
903 if (acpi_id)
904 *acpi_id = id;
905 return true;
906}
907
908/**
909 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
910 * @ids: Array of struct acpi_device_id objects to match against.
911 * @adev: The ACPI device pointer to match.
912 *
913 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
914 *
915 * Return:
916 * a pointer to the first matching ACPI ID on success or %NULL on failure.
917 */
918const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
919 const struct acpi_device *adev)
920{
921 const struct acpi_device_id *id = NULL;
922
923 __acpi_match_device(adev, ids, NULL, &id, NULL);
924 return id;
925}
926EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
927
928/**
929 * acpi_match_device - Match a struct device against a given list of ACPI IDs
930 * @ids: Array of struct acpi_device_id object to match against.
931 * @dev: The device structure to match.
932 *
933 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
934 * object for that handle and use that object to match against a given list of
935 * device IDs.
936 *
937 * Return a pointer to the first matching ID on success or %NULL on failure.
938 */
939const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
940 const struct device *dev)
941{
942 return acpi_match_acpi_device(ids, acpi_companion_match(dev));
943}
944EXPORT_SYMBOL_GPL(acpi_match_device);
945
946static const void *acpi_of_device_get_match_data(const struct device *dev)
947{
948 struct acpi_device *adev = ACPI_COMPANION(dev);
949 const struct of_device_id *match = NULL;
950
951 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
952 return NULL;
953
954 return match->data;
955}
956
957const void *acpi_device_get_match_data(const struct device *dev)
958{
959 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
960 const struct acpi_device_id *match;
961
962 if (!acpi_ids)
963 return acpi_of_device_get_match_data(dev);
964
965 match = acpi_match_device(acpi_ids, dev);
966 if (!match)
967 return NULL;
968
969 return (const void *)match->driver_data;
970}
971EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
972
973int acpi_match_device_ids(struct acpi_device *device,
974 const struct acpi_device_id *ids)
975{
976 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
977}
978EXPORT_SYMBOL(acpi_match_device_ids);
979
980bool acpi_driver_match_device(struct device *dev,
981 const struct device_driver *drv)
982{
983 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
984 const struct of_device_id *of_ids = drv->of_match_table;
985
986 if (!acpi_ids)
987 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
988
989 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
990}
991EXPORT_SYMBOL_GPL(acpi_driver_match_device);
992
993/* --------------------------------------------------------------------------
994 ACPI Driver Management
995 -------------------------------------------------------------------------- */
996
997/**
998 * acpi_bus_register_driver - register a driver with the ACPI bus
999 * @driver: driver being registered
1000 *
1001 * Registers a driver with the ACPI bus. Searches the namespace for all
1002 * devices that match the driver's criteria and binds. Returns zero for
1003 * success or a negative error status for failure.
1004 */
1005int acpi_bus_register_driver(struct acpi_driver *driver)
1006{
1007 if (acpi_disabled)
1008 return -ENODEV;
1009 driver->drv.name = driver->name;
1010 driver->drv.bus = &acpi_bus_type;
1011 driver->drv.owner = driver->owner;
1012
1013 return driver_register(&driver->drv);
1014}
1015
1016EXPORT_SYMBOL(acpi_bus_register_driver);
1017
1018/**
1019 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1020 * @driver: driver to unregister
1021 *
1022 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1023 * devices that match the driver's criteria and unbinds.
1024 */
1025void acpi_bus_unregister_driver(struct acpi_driver *driver)
1026{
1027 driver_unregister(&driver->drv);
1028}
1029
1030EXPORT_SYMBOL(acpi_bus_unregister_driver);
1031
1032/* --------------------------------------------------------------------------
1033 ACPI Bus operations
1034 -------------------------------------------------------------------------- */
1035
1036static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1037{
1038 struct acpi_device *acpi_dev = to_acpi_device(dev);
1039 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1040
1041 return acpi_dev->flags.match_driver
1042 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1043}
1044
1045static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1046{
1047 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1048}
1049
1050static int acpi_device_probe(struct device *dev)
1051{
1052 struct acpi_device *acpi_dev = to_acpi_device(dev);
1053 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1054 int ret;
1055
1056 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1057 return -EINVAL;
1058
1059 if (!acpi_drv->ops.add)
1060 return -ENOSYS;
1061
1062 ret = acpi_drv->ops.add(acpi_dev);
1063 if (ret) {
1064 acpi_dev->driver_data = NULL;
1065 return ret;
1066 }
1067
1068 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1069 acpi_drv->name, acpi_dev->pnp.bus_id);
1070
1071 if (acpi_drv->ops.notify) {
1072 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1073 if (ret) {
1074 if (acpi_drv->ops.remove)
1075 acpi_drv->ops.remove(acpi_dev);
1076
1077 acpi_dev->driver_data = NULL;
1078 return ret;
1079 }
1080 }
1081
1082 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1083 acpi_dev->pnp.bus_id);
1084
1085 get_device(dev);
1086 return 0;
1087}
1088
1089static void acpi_device_remove(struct device *dev)
1090{
1091 struct acpi_device *acpi_dev = to_acpi_device(dev);
1092 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1093
1094 if (acpi_drv->ops.notify)
1095 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1096
1097 if (acpi_drv->ops.remove)
1098 acpi_drv->ops.remove(acpi_dev);
1099
1100 acpi_dev->driver_data = NULL;
1101
1102 put_device(dev);
1103}
1104
1105const struct bus_type acpi_bus_type = {
1106 .name = "acpi",
1107 .match = acpi_bus_match,
1108 .probe = acpi_device_probe,
1109 .remove = acpi_device_remove,
1110 .uevent = acpi_device_uevent,
1111};
1112
1113int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1114{
1115 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1116}
1117EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1118
1119struct acpi_dev_walk_context {
1120 int (*fn)(struct acpi_device *, void *);
1121 void *data;
1122};
1123
1124static int acpi_dev_for_one_check(struct device *dev, void *context)
1125{
1126 struct acpi_dev_walk_context *adwc = context;
1127
1128 if (dev->bus != &acpi_bus_type)
1129 return 0;
1130
1131 return adwc->fn(to_acpi_device(dev), adwc->data);
1132}
1133EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1134
1135int acpi_dev_for_each_child(struct acpi_device *adev,
1136 int (*fn)(struct acpi_device *, void *), void *data)
1137{
1138 struct acpi_dev_walk_context adwc = {
1139 .fn = fn,
1140 .data = data,
1141 };
1142
1143 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1144}
1145
1146int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1147 int (*fn)(struct acpi_device *, void *),
1148 void *data)
1149{
1150 struct acpi_dev_walk_context adwc = {
1151 .fn = fn,
1152 .data = data,
1153 };
1154
1155 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1156}
1157
1158/* --------------------------------------------------------------------------
1159 Initialization/Cleanup
1160 -------------------------------------------------------------------------- */
1161
1162static int __init acpi_bus_init_irq(void)
1163{
1164 acpi_status status;
1165 char *message = NULL;
1166
1167
1168 /*
1169 * Let the system know what interrupt model we are using by
1170 * evaluating the \_PIC object, if exists.
1171 */
1172
1173 switch (acpi_irq_model) {
1174 case ACPI_IRQ_MODEL_PIC:
1175 message = "PIC";
1176 break;
1177 case ACPI_IRQ_MODEL_IOAPIC:
1178 message = "IOAPIC";
1179 break;
1180 case ACPI_IRQ_MODEL_IOSAPIC:
1181 message = "IOSAPIC";
1182 break;
1183 case ACPI_IRQ_MODEL_GIC:
1184 message = "GIC";
1185 break;
1186 case ACPI_IRQ_MODEL_PLATFORM:
1187 message = "platform specific model";
1188 break;
1189 case ACPI_IRQ_MODEL_LPIC:
1190 message = "LPIC";
1191 break;
1192 default:
1193 pr_info("Unknown interrupt routing model\n");
1194 return -ENODEV;
1195 }
1196
1197 pr_info("Using %s for interrupt routing\n", message);
1198
1199 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1200 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1201 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1202 return -ENODEV;
1203 }
1204
1205 return 0;
1206}
1207
1208/**
1209 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1210 *
1211 * The ACPI tables are accessible after this, but the handling of events has not
1212 * been initialized and the global lock is not available yet, so AML should not
1213 * be executed at this point.
1214 *
1215 * Doing this before switching the EFI runtime services to virtual mode allows
1216 * the EfiBootServices memory to be freed slightly earlier on boot.
1217 */
1218void __init acpi_early_init(void)
1219{
1220 acpi_status status;
1221
1222 if (acpi_disabled)
1223 return;
1224
1225 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1226
1227 /* enable workarounds, unless strict ACPI spec. compliance */
1228 if (!acpi_strict)
1229 acpi_gbl_enable_interpreter_slack = TRUE;
1230
1231 acpi_permanent_mmap = true;
1232
1233#ifdef CONFIG_X86
1234 /*
1235 * If the machine falls into the DMI check table,
1236 * DSDT will be copied to memory.
1237 * Note that calling dmi_check_system() here on other architectures
1238 * would not be OK because only x86 initializes dmi early enough.
1239 * Thankfully only x86 systems need such quirks for now.
1240 */
1241 dmi_check_system(dsdt_dmi_table);
1242#endif
1243
1244 status = acpi_reallocate_root_table();
1245 if (ACPI_FAILURE(status)) {
1246 pr_err("Unable to reallocate ACPI tables\n");
1247 goto error0;
1248 }
1249
1250 status = acpi_initialize_subsystem();
1251 if (ACPI_FAILURE(status)) {
1252 pr_err("Unable to initialize the ACPI Interpreter\n");
1253 goto error0;
1254 }
1255
1256#ifdef CONFIG_X86
1257 if (!acpi_ioapic) {
1258 /* compatible (0) means level (3) */
1259 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1260 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1261 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1262 }
1263 /* Set PIC-mode SCI trigger type */
1264 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1265 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1266 } else {
1267 /*
1268 * now that acpi_gbl_FADT is initialized,
1269 * update it with result from INT_SRC_OVR parsing
1270 */
1271 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1272 }
1273#endif
1274 return;
1275
1276 error0:
1277 disable_acpi();
1278}
1279
1280/**
1281 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1282 *
1283 * Switch over the platform to the ACPI mode (if possible).
1284 *
1285 * Doing this too early is generally unsafe, but at the same time it needs to be
1286 * done before all things that really depend on ACPI. The right spot appears to
1287 * be before finalizing the EFI initialization.
1288 */
1289void __init acpi_subsystem_init(void)
1290{
1291 acpi_status status;
1292
1293 if (acpi_disabled)
1294 return;
1295
1296 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1297 if (ACPI_FAILURE(status)) {
1298 pr_err("Unable to enable ACPI\n");
1299 disable_acpi();
1300 } else {
1301 /*
1302 * If the system is using ACPI then we can be reasonably
1303 * confident that any regulators are managed by the firmware
1304 * so tell the regulator core it has everything it needs to
1305 * know.
1306 */
1307 regulator_has_full_constraints();
1308 }
1309}
1310
1311static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1312{
1313 if (event == ACPI_TABLE_EVENT_LOAD)
1314 acpi_scan_table_notify();
1315
1316 return acpi_sysfs_table_handler(event, table, context);
1317}
1318
1319static int __init acpi_bus_init(void)
1320{
1321 int result;
1322 acpi_status status;
1323
1324 acpi_os_initialize1();
1325
1326 status = acpi_load_tables();
1327 if (ACPI_FAILURE(status)) {
1328 pr_err("Unable to load the System Description Tables\n");
1329 goto error1;
1330 }
1331
1332 /*
1333 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1334 * device is found in the namespace.
1335 *
1336 * This is accomplished by looking for the ECDT table and getting the EC
1337 * parameters out of that.
1338 *
1339 * Do that before calling acpi_initialize_objects() which may trigger EC
1340 * address space accesses.
1341 */
1342 acpi_ec_ecdt_probe();
1343
1344 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1345 if (ACPI_FAILURE(status)) {
1346 pr_err("Unable to start the ACPI Interpreter\n");
1347 goto error1;
1348 }
1349
1350 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1351 if (ACPI_FAILURE(status)) {
1352 pr_err("Unable to initialize ACPI objects\n");
1353 goto error1;
1354 }
1355
1356 /*
1357 * _OSC method may exist in module level code,
1358 * so it must be run after ACPI_FULL_INITIALIZATION
1359 */
1360 acpi_bus_osc_negotiate_platform_control();
1361 acpi_bus_osc_negotiate_usb_control();
1362
1363 /*
1364 * _PDC control method may load dynamic SSDT tables,
1365 * and we need to install the table handler before that.
1366 */
1367 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1368
1369 acpi_sysfs_init();
1370
1371 acpi_early_processor_control_setup();
1372
1373 /*
1374 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1375 * is necessary to enable it as early as possible.
1376 */
1377 acpi_ec_dsdt_probe();
1378
1379 pr_info("Interpreter enabled\n");
1380
1381 /* Initialize sleep structures */
1382 acpi_sleep_init();
1383
1384 /*
1385 * Get the system interrupt model and evaluate \_PIC.
1386 */
1387 result = acpi_bus_init_irq();
1388 if (result)
1389 goto error1;
1390
1391 /*
1392 * Register the for all standard device notifications.
1393 */
1394 status =
1395 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1396 &acpi_bus_notify, NULL);
1397 if (ACPI_FAILURE(status)) {
1398 pr_err("Unable to register for system notifications\n");
1399 goto error1;
1400 }
1401
1402 /*
1403 * Create the top ACPI proc directory
1404 */
1405 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1406
1407 result = bus_register(&acpi_bus_type);
1408 if (!result)
1409 return 0;
1410
1411 /* Mimic structured exception handling */
1412 error1:
1413 acpi_terminate();
1414 return -ENODEV;
1415}
1416
1417struct kobject *acpi_kobj;
1418EXPORT_SYMBOL_GPL(acpi_kobj);
1419
1420static int __init acpi_init(void)
1421{
1422 int result;
1423
1424 if (acpi_disabled) {
1425 pr_info("Interpreter disabled.\n");
1426 return -ENODEV;
1427 }
1428
1429 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1430 if (!acpi_kobj)
1431 pr_debug("%s: kset create error\n", __func__);
1432
1433 init_prmt();
1434 acpi_init_pcc();
1435 result = acpi_bus_init();
1436 if (result) {
1437 kobject_put(acpi_kobj);
1438 disable_acpi();
1439 return result;
1440 }
1441 acpi_init_ffh();
1442
1443 pci_mmcfg_late_init();
1444 acpi_viot_early_init();
1445 acpi_hest_init();
1446 acpi_ghes_init();
1447 acpi_arm_init();
1448 acpi_scan_init();
1449 acpi_ec_init();
1450 acpi_debugfs_init();
1451 acpi_sleep_proc_init();
1452 acpi_wakeup_device_init();
1453 acpi_debugger_init();
1454 acpi_setup_sb_notify_handler();
1455 acpi_viot_init();
1456 return 0;
1457}
1458
1459subsys_initcall(acpi_init);