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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 <[email protected]>
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 if (!device->status.present && device->status.enabled) {
116 pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n",
117 device->pnp.bus_id, (u32)sta);
118 device->status.enabled = 0;
119 /*
120 * The status is clearly invalid, so clear the functional bit as
121 * well to avoid attempting to use the device.
122 */
123 device->status.functional = 0;
124 }
125
126 acpi_set_device_status(device, sta);
127
128 if (device->status.functional && !device->status.present) {
129 pr_debug("Device [%s] status [%08x]: functional but not present\n",
130 device->pnp.bus_id, (u32)sta);
131 }
132
133 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
134 return 0;
135}
136EXPORT_SYMBOL(acpi_bus_get_status);
137
138void acpi_bus_private_data_handler(acpi_handle handle,
139 void *context)
140{
141 return;
142}
143EXPORT_SYMBOL(acpi_bus_private_data_handler);
144
145int acpi_bus_attach_private_data(acpi_handle handle, void *data)
146{
147 acpi_status status;
148
149 status = acpi_attach_data(handle,
150 acpi_bus_private_data_handler, data);
151 if (ACPI_FAILURE(status)) {
152 acpi_handle_debug(handle, "Error attaching device data\n");
153 return -ENODEV;
154 }
155
156 return 0;
157}
158EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
159
160int acpi_bus_get_private_data(acpi_handle handle, void **data)
161{
162 acpi_status status;
163
164 if (!data)
165 return -EINVAL;
166
167 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
168 if (ACPI_FAILURE(status)) {
169 acpi_handle_debug(handle, "No context for object\n");
170 return -ENODEV;
171 }
172
173 return 0;
174}
175EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
176
177void acpi_bus_detach_private_data(acpi_handle handle)
178{
179 acpi_detach_data(handle, acpi_bus_private_data_handler);
180}
181EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
182
183static void acpi_dump_osc_data(acpi_handle handle, const guid_t *guid, int rev,
184 struct acpi_buffer *cap)
185{
186 u32 *capbuf = cap->pointer;
187 int i;
188
189 acpi_handle_debug(handle, "_OSC: UUID: %pUL, rev: %d\n", guid, rev);
190 for (i = 0; i < cap->length / sizeof(u32); i++)
191 acpi_handle_debug(handle, "_OSC: capabilities DWORD %i: [%08x]\n",
192 i, capbuf[i]);
193}
194
195#define OSC_ERROR_MASK (OSC_REQUEST_ERROR | OSC_INVALID_UUID_ERROR | \
196 OSC_INVALID_REVISION_ERROR | \
197 OSC_CAPABILITIES_MASK_ERROR)
198
199static int acpi_eval_osc(acpi_handle handle, guid_t *guid, int rev,
200 struct acpi_buffer *cap,
201 union acpi_object in_params[at_least 4],
202 struct acpi_buffer *output)
203{
204 struct acpi_object_list input;
205 union acpi_object *out_obj;
206 acpi_status status;
207
208 in_params[0].type = ACPI_TYPE_BUFFER;
209 in_params[0].buffer.length = sizeof(*guid);
210 in_params[0].buffer.pointer = (u8 *)guid;
211 in_params[1].type = ACPI_TYPE_INTEGER;
212 in_params[1].integer.value = rev;
213 in_params[2].type = ACPI_TYPE_INTEGER;
214 in_params[2].integer.value = cap->length / sizeof(u32);
215 in_params[3].type = ACPI_TYPE_BUFFER;
216 in_params[3].buffer.length = cap->length;
217 in_params[3].buffer.pointer = cap->pointer;
218 input.pointer = in_params;
219 input.count = 4;
220
221 output->length = ACPI_ALLOCATE_BUFFER;
222 output->pointer = NULL;
223
224 status = acpi_evaluate_object(handle, "_OSC", &input, output);
225 if (ACPI_FAILURE(status) || !output->length)
226 return -ENODATA;
227
228 out_obj = output->pointer;
229 if (out_obj->type != ACPI_TYPE_BUFFER ||
230 out_obj->buffer.length != cap->length) {
231 acpi_handle_debug(handle, "Invalid _OSC return buffer\n");
232 acpi_dump_osc_data(handle, guid, rev, cap);
233 ACPI_FREE(out_obj);
234 return -ENODATA;
235 }
236
237 return 0;
238}
239
240static bool acpi_osc_error_check(acpi_handle handle, guid_t *guid, int rev,
241 struct acpi_buffer *cap, u32 *retbuf)
242{
243 /* Only take defined error bits into account. */
244 u32 errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK;
245 u32 *capbuf = cap->pointer;
246 bool fail;
247
248 /*
249 * If OSC_QUERY_ENABLE is set, ignore the "capabilities masked"
250 * bit because it merely means that some features have not been
251 * acknowledged which is not unexpected.
252 */
253 if (capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE)
254 errors &= ~OSC_CAPABILITIES_MASK_ERROR;
255
256 if (!errors)
257 return false;
258
259 acpi_dump_osc_data(handle, guid, rev, cap);
260 /*
261 * As a rule, fail only if OSC_QUERY_ENABLE is set because otherwise the
262 * acknowledged features need to be controlled.
263 */
264 fail = !!(capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE);
265
266 if (errors & OSC_REQUEST_ERROR)
267 acpi_handle_debug(handle, "_OSC: request failed\n");
268
269 if (errors & OSC_INVALID_UUID_ERROR) {
270 acpi_handle_debug(handle, "_OSC: invalid UUID\n");
271 /*
272 * Always fail if this bit is set because it means that the
273 * request could not be processed.
274 */
275 fail = true;
276 }
277
278 if (errors & OSC_INVALID_REVISION_ERROR)
279 acpi_handle_debug(handle, "_OSC: invalid revision\n");
280
281 if (errors & OSC_CAPABILITIES_MASK_ERROR)
282 acpi_handle_debug(handle, "_OSC: capability bits masked\n");
283
284 return fail;
285}
286
287acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
288{
289 union acpi_object in_params[4], *out_obj;
290 struct acpi_buffer output;
291 acpi_status status = AE_OK;
292 guid_t guid;
293 u32 *retbuf;
294 int ret;
295
296 if (!context || !context->cap.pointer ||
297 context->cap.length < 2 * sizeof(u32) ||
298 guid_parse(context->uuid_str, &guid))
299 return AE_BAD_PARAMETER;
300
301 ret = acpi_eval_osc(handle, &guid, context->rev, &context->cap,
302 in_params, &output);
303 if (ret)
304 return AE_ERROR;
305
306 out_obj = output.pointer;
307 retbuf = (u32 *)out_obj->buffer.pointer;
308
309 if (acpi_osc_error_check(handle, &guid, context->rev, &context->cap, retbuf)) {
310 status = AE_ERROR;
311 goto out;
312 }
313
314 context->ret.length = out_obj->buffer.length;
315 context->ret.pointer = kmemdup(retbuf, context->ret.length, GFP_KERNEL);
316 if (!context->ret.pointer) {
317 status = AE_NO_MEMORY;
318 goto out;
319 }
320 status = AE_OK;
321
322out:
323 ACPI_FREE(out_obj);
324 return status;
325}
326EXPORT_SYMBOL(acpi_run_osc);
327
328static int acpi_osc_handshake(acpi_handle handle, const char *uuid_str,
329 int rev, u32 *capbuf, size_t bufsize)
330{
331 union acpi_object in_params[4], *out_obj;
332 struct acpi_object_list input;
333 struct acpi_buffer cap = {
334 .pointer = capbuf,
335 .length = bufsize * sizeof(u32),
336 };
337 struct acpi_buffer output;
338 u32 *retbuf, test, errors;
339 guid_t guid;
340 int ret, i;
341
342 if (!capbuf || bufsize < 2 || guid_parse(uuid_str, &guid))
343 return -EINVAL;
344
345 /* First evaluate _OSC with OSC_QUERY_ENABLE set. */
346 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
347
348 ret = acpi_eval_osc(handle, &guid, rev, &cap, in_params, &output);
349 if (ret)
350 return ret;
351
352 out_obj = output.pointer;
353 retbuf = (u32 *)out_obj->buffer.pointer;
354
355 if (acpi_osc_error_check(handle, &guid, rev, &cap, retbuf)) {
356 ret = -ENODATA;
357 goto out;
358 }
359
360 /*
361 * Clear the feature bits in the capabilities buffer that have not been
362 * acknowledged and clear the return buffer.
363 */
364 for (i = OSC_QUERY_DWORD + 1, test = 0; i < bufsize; i++) {
365 capbuf[i] &= retbuf[i];
366 test |= capbuf[i];
367 retbuf[i] = 0;
368 }
369 /*
370 * If none of the feature bits have been acknowledged, there's nothing
371 * more to do. capbuf[] contains a feature mask of all zeros.
372 */
373 if (!test)
374 goto out;
375
376 retbuf[OSC_QUERY_DWORD] = 0;
377 /*
378 * Now evaluate _OSC again (directly) with OSC_QUERY_ENABLE clear and
379 * the updated input and output buffers used before. Since the feature
380 * bits that were clear in the return buffer from the previous _OSC
381 * evaluation are also clear in the capabilities buffer now, this _OSC
382 * evaluation is not expected to fail.
383 */
384 capbuf[OSC_QUERY_DWORD] = 0;
385 /* Reuse in_params[] populated by acpi_eval_osc(). */
386 input.pointer = in_params;
387 input.count = 4;
388
389 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_OSC", &input, &output))) {
390 ret = -ENODATA;
391 goto out;
392 }
393
394 /*
395 * Clear the feature bits in capbuf[] that have not been acknowledged.
396 * After that, capbuf[] contains the resultant feature mask.
397 */
398 for (i = OSC_QUERY_DWORD + 1, test = 0; i < bufsize; i++) {
399 test |= capbuf[i] & ~retbuf[i];
400 capbuf[i] &= retbuf[i];
401 }
402
403 errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK;
404 /*
405 * Some platforms set OSC_CAPABILITIES_MASK_ERROR even though they
406 * acknowledge all of the requested features, so avoid complaining in
407 * those cases unless any other error bits are also set.
408 */
409 if (errors && (test || errors != OSC_CAPABILITIES_MASK_ERROR)) {
410 /*
411 * Complain about the unexpected errors and print diagnostic
412 * information related to them.
413 */
414 acpi_handle_err(handle, "_OSC: errors while processing control request\n");
415 acpi_handle_err(handle, "_OSC: some features may be missing\n");
416 acpi_osc_error_check(handle, &guid, rev, &cap, retbuf);
417 }
418
419out:
420 ACPI_FREE(out_obj);
421 return ret;
422}
423
424bool osc_sb_apei_support_acked;
425
426/*
427 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
428 * OSPM supports platform coordinated low power idle(LPI) states
429 */
430bool osc_pc_lpi_support_confirmed;
431EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
432
433/*
434 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
435 * Starting with ACPI Specification 6.2, all _CPC registers can be in
436 * PCC, System Memory, System IO, or Functional Fixed Hardware address
437 * spaces. OSPM support for this more flexible register space scheme is
438 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
439 *
440 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
441 * - PCC or Functional Fixed Hardware address space if defined
442 * - SystemMemory address space (NULL register) if not defined
443 */
444bool osc_cpc_flexible_adr_space_confirmed;
445EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
446
447/*
448 * ACPI 6.4 Operating System Capabilities for USB.
449 */
450bool osc_sb_native_usb4_support_confirmed;
451EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
452
453bool osc_sb_cppc2_support_acked;
454
455static void acpi_bus_osc_negotiate_platform_control(void)
456{
457 static const u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
458 u32 capbuf[2], feature_mask;
459 acpi_handle handle;
460
461 feature_mask = OSC_SB_PR3_SUPPORT | OSC_SB_HOTPLUG_OST_SUPPORT |
462 OSC_SB_PCLPI_SUPPORT | OSC_SB_OVER_16_PSTATES_SUPPORT |
463 OSC_SB_GED_SUPPORT | OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT;
464
465 if (IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_X86))
466 feature_mask |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
467
468 if (IS_ENABLED(CONFIG_ACPI_CPPC_LIB)) {
469 feature_mask |= OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT |
470 OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
471 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
472 feature_mask |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
473 }
474
475 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
476 feature_mask |= OSC_SB_PAD_SUPPORT;
477
478 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
479 feature_mask |= OSC_SB_PPC_OST_SUPPORT;
480
481 if (IS_ENABLED(CONFIG_ACPI_THERMAL))
482 feature_mask |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
483
484 if (IS_ENABLED(CONFIG_ACPI_BATTERY))
485 feature_mask |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT;
486
487 if (IS_ENABLED(CONFIG_ACPI_PRMT))
488 feature_mask |= OSC_SB_PRM_SUPPORT;
489
490 if (IS_ENABLED(CONFIG_ACPI_FFH))
491 feature_mask |= OSC_SB_FFH_OPR_SUPPORT;
492
493 if (IS_ENABLED(CONFIG_USB4))
494 feature_mask |= OSC_SB_NATIVE_USB4_SUPPORT;
495
496 if (!ghes_disable)
497 feature_mask |= OSC_SB_APEI_SUPPORT;
498
499 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
500 return;
501
502 capbuf[OSC_SUPPORT_DWORD] = feature_mask;
503
504 acpi_handle_info(handle, "platform _OSC: OS support mask [%08x]\n", feature_mask);
505
506 if (acpi_osc_handshake(handle, sb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf)))
507 return;
508
509 feature_mask = capbuf[OSC_SUPPORT_DWORD];
510
511 acpi_handle_info(handle, "platform _OSC: OS control mask [%08x]\n", feature_mask);
512
513 osc_sb_cppc2_support_acked = feature_mask & OSC_SB_CPCV2_SUPPORT;
514 osc_sb_apei_support_acked = feature_mask & OSC_SB_APEI_SUPPORT;
515 osc_pc_lpi_support_confirmed = feature_mask & OSC_SB_PCLPI_SUPPORT;
516 osc_sb_native_usb4_support_confirmed = feature_mask & OSC_SB_NATIVE_USB4_SUPPORT;
517 osc_cpc_flexible_adr_space_confirmed = feature_mask & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
518}
519
520/*
521 * Native control of USB4 capabilities. If any of the tunneling bits is
522 * set it means OS is in control and we use software based connection
523 * manager.
524 */
525u32 osc_sb_native_usb4_control;
526EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
527
528static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
529{
530 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
531 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
532 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
533 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
534 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
535}
536
537static void acpi_bus_osc_negotiate_usb_control(void)
538{
539 static const u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
540 u32 capbuf[3], control;
541 acpi_handle handle;
542
543 if (!osc_sb_native_usb4_support_confirmed)
544 return;
545
546 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
547 return;
548
549 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
550 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
551
552 capbuf[OSC_SUPPORT_DWORD] = 0;
553 capbuf[OSC_CONTROL_DWORD] = control;
554
555 if (acpi_osc_handshake(handle, sb_usb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf)))
556 return;
557
558 osc_sb_native_usb4_control = capbuf[OSC_CONTROL_DWORD];
559
560 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
561 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", osc_sb_native_usb4_control);
562}
563
564/* --------------------------------------------------------------------------
565 Notification Handling
566 -------------------------------------------------------------------------- */
567
568/**
569 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
570 * @handle: Target ACPI object.
571 * @type: Notification type.
572 * @data: Ignored.
573 *
574 * This only handles notifications related to device hotplug.
575 */
576static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
577{
578 struct acpi_device *adev;
579
580 switch (type) {
581 case ACPI_NOTIFY_BUS_CHECK:
582 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
583 break;
584
585 case ACPI_NOTIFY_DEVICE_CHECK:
586 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
587 break;
588
589 case ACPI_NOTIFY_DEVICE_WAKE:
590 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
591 return;
592
593 case ACPI_NOTIFY_EJECT_REQUEST:
594 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
595 break;
596
597 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
598 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
599 /* TBD: Exactly what does 'light' mean? */
600 return;
601
602 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
603 acpi_handle_err(handle, "Device cannot be configured due "
604 "to a frequency mismatch\n");
605 return;
606
607 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
608 acpi_handle_err(handle, "Device cannot be configured due "
609 "to a bus mode mismatch\n");
610 return;
611
612 case ACPI_NOTIFY_POWER_FAULT:
613 acpi_handle_err(handle, "Device has suffered a power fault\n");
614 return;
615
616 default:
617 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
618 return;
619 }
620
621 adev = acpi_get_acpi_dev(handle);
622
623 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
624 return;
625
626 acpi_put_acpi_dev(adev);
627
628 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
629}
630
631int acpi_dev_install_notify_handler(struct acpi_device *adev,
632 u32 handler_type,
633 acpi_notify_handler handler, void *context)
634{
635 acpi_status status;
636
637 status = acpi_install_notify_handler(adev->handle, handler_type,
638 handler, context);
639 if (ACPI_FAILURE(status))
640 return -ENODEV;
641
642 return 0;
643}
644EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
645
646void acpi_dev_remove_notify_handler(struct acpi_device *adev,
647 u32 handler_type,
648 acpi_notify_handler handler)
649{
650 acpi_remove_notify_handler(adev->handle, handler_type, handler);
651 acpi_os_wait_events_complete();
652}
653EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
654
655struct acpi_notify_handler_devres {
656 struct acpi_device *adev;
657 acpi_notify_handler handler;
658 u32 handler_type;
659};
660
661static void devm_acpi_notify_handler_release(struct device *dev, void *res)
662{
663 struct acpi_notify_handler_devres *dr = res;
664
665 acpi_dev_remove_notify_handler(dr->adev, dr->handler_type, dr->handler);
666}
667
668/**
669 * devm_acpi_install_notify_handler - Install an ACPI notify handler for a
670 * managed device
671 * @dev: Device to install a notify handler for
672 * @handler_type: Type of the notify handler
673 * @handler: Handler function to install
674 * @context: Data passed back to the handler function
675 *
676 * This function performs the same function as acpi_dev_install_notify_handler()
677 * called for the ACPI companion of @dev with the same @handler_type, @handler,
678 * and @context arguments, but the ACPI notify handler installed by it will be
679 * automatically removed on driver detach.
680 *
681 * Callers should ensure that all resources used by @handler have been allocated
682 * prior to invoking this function, in which case those resources should be
683 * devres-managed so that they won't be released before the notify handler
684 * removal. Otherwise, special synchronization between @handler and the
685 * management of those resources is required.
686 *
687 * When the request fails, an error message is printed. Don't add extra error
688 * messages at the call sites.
689 *
690 * Return: 0 on success or a negative error number.
691 */
692int devm_acpi_install_notify_handler(struct device *dev, u32 handler_type,
693 acpi_notify_handler handler, void *context)
694{
695 struct acpi_notify_handler_devres *dr;
696 struct acpi_device *adev;
697 int ret;
698
699 adev = ACPI_COMPANION(dev);
700 if (!adev)
701 return dev_err_probe(dev, -ENODEV, "No ACPI companion\n");
702
703 dr = devres_alloc(devm_acpi_notify_handler_release, sizeof(*dr), GFP_KERNEL);
704 if (!dr)
705 return -ENOMEM;
706
707 ret = acpi_dev_install_notify_handler(adev, handler_type, handler, context);
708 if (ret) {
709 devres_free(dr);
710 return dev_err_probe(dev, ret, "Failed to install an ACPI notify handler\n");
711 }
712
713 dr->adev = adev;
714 dr->handler = handler;
715 dr->handler_type = handler_type;
716 devres_add(dev, dr);
717
718 return 0;
719}
720EXPORT_SYMBOL_GPL(devm_acpi_install_notify_handler);
721
722/* Handle events targeting \_SB device (at present only graceful shutdown) */
723
724#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
725#define ACPI_SB_INDICATE_INTERVAL 10000
726
727static void sb_notify_work(struct work_struct *dummy)
728{
729 acpi_handle sb_handle;
730
731 orderly_poweroff(true);
732
733 /*
734 * After initiating graceful shutdown, the ACPI spec requires OSPM
735 * to evaluate _OST method once every 10seconds to indicate that
736 * the shutdown is in progress
737 */
738 acpi_get_handle(NULL, "\\_SB", &sb_handle);
739 while (1) {
740 pr_info("Graceful shutdown in progress.\n");
741 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
742 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
743 msleep(ACPI_SB_INDICATE_INTERVAL);
744 }
745}
746
747static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
748{
749 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
750
751 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
752 if (!work_busy(&acpi_sb_work))
753 schedule_work(&acpi_sb_work);
754 } else {
755 pr_warn("event %x is not supported by \\_SB device\n", event);
756 }
757}
758
759static int __init acpi_setup_sb_notify_handler(void)
760{
761 acpi_handle sb_handle;
762
763 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
764 return -ENXIO;
765
766 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
767 acpi_sb_notify, NULL)))
768 return -EINVAL;
769
770 return 0;
771}
772
773/* --------------------------------------------------------------------------
774 Device Matching
775 -------------------------------------------------------------------------- */
776
777
778static struct device *primary_physical_device(struct acpi_device *adev)
779{
780 struct acpi_device_physical_node *pn;
781
782 pn = list_first_entry_or_null(&adev->physical_node_list,
783 struct acpi_device_physical_node, node);
784 if (pn)
785 return pn->dev;
786
787 return NULL;
788}
789
790/**
791 * acpi_bus_get_primary_device - Get first physical device for a given ACPI one
792 * @adev: ACPI device to get the first physical device for.
793 *
794 * Find the first physical device for which @adev is the ACPI companion and
795 * reference count it if present.
796 *
797 * Return: Pointer to the first physical counterpart of @adev or NULL if there
798 * are none. Callers are responsible for invoking put_device() on the returned
799 * device.
800 */
801struct device *acpi_bus_get_primary_device(struct acpi_device *adev)
802{
803 if (!adev)
804 return NULL;
805
806 guard(mutex)(&adev->physical_node_lock);
807
808 return get_device(primary_physical_device(adev));
809}
810EXPORT_SYMBOL_GPL(acpi_bus_get_primary_device);
811
812/**
813 * acpi_get_first_physical_node - Find first physical node of an ACPI device
814 * @adev: ACPI device in question
815 *
816 * Return: First physical node of ACPI device @adev
817 */
818struct device *acpi_get_first_physical_node(struct acpi_device *adev)
819{
820 guard(mutex)(&adev->physical_node_lock);
821
822 return primary_physical_device(adev);
823}
824EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
825
826static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
827 const struct device *dev)
828{
829 const struct device *phys_dev = acpi_get_first_physical_node(adev);
830
831 return phys_dev && phys_dev == dev ? adev : NULL;
832}
833
834/**
835 * acpi_device_is_first_physical_node - Is given dev first physical node
836 * @adev: ACPI companion device
837 * @dev: Physical device to check
838 *
839 * Function checks if given @dev is the first physical devices attached to
840 * the ACPI companion device. This distinction is needed in some cases
841 * where the same companion device is shared between many physical devices.
842 *
843 * Note that the caller have to provide valid @adev pointer.
844 */
845bool acpi_device_is_first_physical_node(struct acpi_device *adev,
846 const struct device *dev)
847{
848 return !!acpi_primary_dev_companion(adev, dev);
849}
850
851/*
852 * acpi_companion_match() - Can we match via ACPI companion device
853 * @dev: Device in question
854 *
855 * Check if the given device has an ACPI companion and if that companion has
856 * a valid list of PNP IDs, and if the device is the first (primary) physical
857 * device associated with it. Return the companion pointer if that's the case
858 * or NULL otherwise.
859 *
860 * If multiple physical devices are attached to a single ACPI companion, we need
861 * to be careful. The usage scenario for this kind of relationship is that all
862 * of the physical devices in question use resources provided by the ACPI
863 * companion. A typical case is an MFD device where all the sub-devices share
864 * the parent's ACPI companion. In such cases we can only allow the primary
865 * (first) physical device to be matched with the help of the companion's PNP
866 * IDs.
867 *
868 * Additional physical devices sharing the ACPI companion can still use
869 * resources available from it but they will be matched normally using functions
870 * provided by their bus types (and analogously for their modalias).
871 */
872const struct acpi_device *acpi_companion_match(const struct device *dev)
873{
874 struct acpi_device *adev;
875
876 adev = ACPI_COMPANION(dev);
877 if (!adev)
878 return NULL;
879
880 if (list_empty(&adev->pnp.ids))
881 return NULL;
882
883 return acpi_primary_dev_companion(adev, dev);
884}
885
886/**
887 * acpi_of_match_device - Match device object using the "compatible" property.
888 * @adev: ACPI device object to match.
889 * @of_match_table: List of device IDs to match against.
890 * @of_id: OF ID if matched
891 *
892 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
893 * identifiers and a _DSD object with the "compatible" property, use that
894 * property to match against the given list of identifiers.
895 */
896static bool acpi_of_match_device(const struct acpi_device *adev,
897 const struct of_device_id *of_match_table,
898 const struct of_device_id **of_id)
899{
900 const union acpi_object *of_compatible, *obj;
901 int i, nval;
902
903 if (!adev)
904 return false;
905
906 of_compatible = adev->data.of_compatible;
907 if (!of_match_table || !of_compatible)
908 return false;
909
910 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
911 nval = of_compatible->package.count;
912 obj = of_compatible->package.elements;
913 } else { /* Must be ACPI_TYPE_STRING. */
914 nval = 1;
915 obj = of_compatible;
916 }
917 /* Now we can look for the driver DT compatible strings */
918 for (i = 0; i < nval; i++, obj++) {
919 const struct of_device_id *id;
920
921 for (id = of_match_table; id->compatible[0]; id++)
922 if (!strcasecmp(obj->string.pointer, id->compatible)) {
923 if (of_id)
924 *of_id = id;
925 return true;
926 }
927 }
928
929 return false;
930}
931
932static bool acpi_of_modalias(struct acpi_device *adev,
933 char *modalias, size_t len)
934{
935 const union acpi_object *of_compatible;
936 const union acpi_object *obj;
937 const char *str, *chr;
938
939 of_compatible = adev->data.of_compatible;
940 if (!of_compatible)
941 return false;
942
943 if (of_compatible->type == ACPI_TYPE_PACKAGE)
944 obj = of_compatible->package.elements;
945 else /* Must be ACPI_TYPE_STRING. */
946 obj = of_compatible;
947
948 str = obj->string.pointer;
949 chr = strchr(str, ',');
950 strscpy(modalias, chr ? chr + 1 : str, len);
951
952 return true;
953}
954
955/**
956 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
957 * @adev: ACPI device object to match
958 * @default_id: ID string to use as default if no compatible string found
959 * @modalias: Pointer to buffer that modalias value will be copied into
960 * @len: Length of modalias buffer
961 *
962 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
963 * objects. If there is a compatible string for @adev, it will be copied to
964 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
965 * used.
966 */
967void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
968 char *modalias, size_t len)
969{
970 if (!acpi_of_modalias(adev, modalias, len))
971 strscpy(modalias, default_id, len);
972}
973EXPORT_SYMBOL_GPL(acpi_set_modalias);
974
975static bool __acpi_match_device_cls(const struct acpi_device_id *id,
976 struct acpi_hardware_id *hwid)
977{
978 int i, msk, byte_shift;
979 char buf[3];
980
981 if (!id->cls)
982 return false;
983
984 /* Apply class-code bitmask, before checking each class-code byte */
985 for (i = 1; i <= 3; i++) {
986 byte_shift = 8 * (3 - i);
987 msk = (id->cls_msk >> byte_shift) & 0xFF;
988 if (!msk)
989 continue;
990
991 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
992 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
993 return false;
994 }
995 return true;
996}
997
998static bool __acpi_match_device(const struct acpi_device *device,
999 const struct acpi_device_id *acpi_ids,
1000 const struct of_device_id *of_ids,
1001 const struct acpi_device_id **acpi_id,
1002 const struct of_device_id **of_id)
1003{
1004 const struct acpi_device_id *id;
1005 struct acpi_hardware_id *hwid;
1006
1007 /*
1008 * If the device is not present, it is unnecessary to load device
1009 * driver for it.
1010 */
1011 if (!device || !device->status.present)
1012 return false;
1013
1014 list_for_each_entry(hwid, &device->pnp.ids, list) {
1015 /* First, check the ACPI/PNP IDs provided by the caller. */
1016 if (acpi_ids) {
1017 for (id = acpi_ids; id->id[0] || id->cls; id++) {
1018 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
1019 goto out_acpi_match;
1020 if (id->cls && __acpi_match_device_cls(id, hwid))
1021 goto out_acpi_match;
1022 }
1023 }
1024
1025 /*
1026 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
1027 * "compatible" property if found.
1028 */
1029 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
1030 return acpi_of_match_device(device, of_ids, of_id);
1031 }
1032 return false;
1033
1034out_acpi_match:
1035 if (acpi_id)
1036 *acpi_id = id;
1037 return true;
1038}
1039
1040/**
1041 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
1042 * @ids: Array of struct acpi_device_id objects to match against.
1043 * @adev: The ACPI device pointer to match.
1044 *
1045 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
1046 *
1047 * Return:
1048 * a pointer to the first matching ACPI ID on success or %NULL on failure.
1049 */
1050const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
1051 const struct acpi_device *adev)
1052{
1053 const struct acpi_device_id *id = NULL;
1054
1055 __acpi_match_device(adev, ids, NULL, &id, NULL);
1056 return id;
1057}
1058EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
1059
1060/**
1061 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1062 * @ids: Array of struct acpi_device_id object to match against.
1063 * @dev: The device structure to match.
1064 *
1065 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1066 * object for that handle and use that object to match against a given list of
1067 * device IDs.
1068 *
1069 * Return a pointer to the first matching ID on success or %NULL on failure.
1070 */
1071const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
1072 const struct device *dev)
1073{
1074 return acpi_match_acpi_device(ids, acpi_companion_match(dev));
1075}
1076EXPORT_SYMBOL_GPL(acpi_match_device);
1077
1078const void *acpi_device_get_match_data(const struct device *dev)
1079{
1080 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
1081 const struct of_device_id *of_ids = dev->driver->of_match_table;
1082 const struct acpi_device *adev = acpi_companion_match(dev);
1083 const struct acpi_device_id *acpi_id = NULL;
1084 const struct of_device_id *of_id = NULL;
1085
1086 if (!__acpi_match_device(adev, acpi_ids, of_ids, &acpi_id, &of_id))
1087 return NULL;
1088
1089 if (acpi_id)
1090 return (const void *)acpi_id->driver_data;
1091
1092 if (of_id)
1093 return of_id->data;
1094
1095 return NULL;
1096}
1097EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
1098
1099int acpi_match_device_ids(struct acpi_device *device,
1100 const struct acpi_device_id *ids)
1101{
1102 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
1103}
1104EXPORT_SYMBOL(acpi_match_device_ids);
1105
1106bool acpi_driver_match_device(struct device *dev,
1107 const struct device_driver *drv)
1108{
1109 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
1110 const struct of_device_id *of_ids = drv->of_match_table;
1111
1112 if (!acpi_ids)
1113 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
1114
1115 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
1116}
1117EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1118
1119/* --------------------------------------------------------------------------
1120 ACPI Bus operations
1121 -------------------------------------------------------------------------- */
1122
1123static int acpi_bus_match(struct device *dev, const struct device_driver *drv)
1124{
1125 return 0;
1126}
1127
1128static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1129{
1130 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1131}
1132
1133const struct bus_type acpi_bus_type = {
1134 .name = "acpi",
1135 .match = acpi_bus_match,
1136 .uevent = acpi_device_uevent,
1137};
1138
1139int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1140{
1141 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1142}
1143EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1144
1145/**
1146 * acpi_bus_find_device_by_name() - Locate an ACPI device by its name
1147 * @name: Name of the device to match
1148 *
1149 * The caller is responsible for calling put_device() on the returned object.
1150 *
1151 * Returns:
1152 * New reference to the matched device or NULL if the device can't be found.
1153 */
1154struct device *acpi_bus_find_device_by_name(const char *name)
1155{
1156 return bus_find_device_by_name(&acpi_bus_type, NULL, name);
1157}
1158EXPORT_SYMBOL_GPL(acpi_bus_find_device_by_name);
1159
1160struct acpi_dev_walk_context {
1161 int (*fn)(struct acpi_device *, void *);
1162 void *data;
1163};
1164
1165static int acpi_dev_for_one_check(struct device *dev, void *context)
1166{
1167 struct acpi_dev_walk_context *adwc = context;
1168
1169 if (dev->bus != &acpi_bus_type)
1170 return 0;
1171
1172 return adwc->fn(to_acpi_device(dev), adwc->data);
1173}
1174EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1175
1176int acpi_dev_for_each_child(struct acpi_device *adev,
1177 int (*fn)(struct acpi_device *, void *), void *data)
1178{
1179 struct acpi_dev_walk_context adwc = {
1180 .fn = fn,
1181 .data = data,
1182 };
1183
1184 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1185}
1186
1187int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1188 int (*fn)(struct acpi_device *, void *),
1189 void *data)
1190{
1191 struct acpi_dev_walk_context adwc = {
1192 .fn = fn,
1193 .data = data,
1194 };
1195
1196 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1197}
1198
1199/* --------------------------------------------------------------------------
1200 Initialization/Cleanup
1201 -------------------------------------------------------------------------- */
1202
1203static int __init acpi_bus_init_irq(void)
1204{
1205 acpi_status status;
1206 char *message = NULL;
1207
1208
1209 /*
1210 * Let the system know what interrupt model we are using by
1211 * evaluating the \_PIC object, if exists.
1212 */
1213
1214 switch (acpi_irq_model) {
1215 case ACPI_IRQ_MODEL_PIC:
1216 message = "PIC";
1217 break;
1218 case ACPI_IRQ_MODEL_IOAPIC:
1219 message = "IOAPIC";
1220 break;
1221 case ACPI_IRQ_MODEL_IOSAPIC:
1222 message = "IOSAPIC";
1223 break;
1224 case ACPI_IRQ_MODEL_GIC:
1225 message = "GIC";
1226 break;
1227 case ACPI_IRQ_MODEL_GIC_V5:
1228 message = "GICv5";
1229 break;
1230 case ACPI_IRQ_MODEL_PLATFORM:
1231 message = "platform specific model";
1232 break;
1233 case ACPI_IRQ_MODEL_LPIC:
1234 message = "LPIC";
1235 break;
1236 case ACPI_IRQ_MODEL_RINTC:
1237 message = "RINTC";
1238 break;
1239 default:
1240 pr_info("Unknown interrupt routing model\n");
1241 return -ENODEV;
1242 }
1243
1244 pr_info("Using %s for interrupt routing\n", message);
1245
1246 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1247 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1248 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1249 return -ENODEV;
1250 }
1251
1252 return 0;
1253}
1254
1255/**
1256 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1257 *
1258 * The ACPI tables are accessible after this, but the handling of events has not
1259 * been initialized and the global lock is not available yet, so AML should not
1260 * be executed at this point.
1261 *
1262 * Doing this before switching the EFI runtime services to virtual mode allows
1263 * the EfiBootServices memory to be freed slightly earlier on boot.
1264 */
1265void __init acpi_early_init(void)
1266{
1267 acpi_status status;
1268
1269 if (acpi_disabled)
1270 return;
1271
1272 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1273
1274 /* enable workarounds, unless strict ACPI spec. compliance */
1275 if (!acpi_strict)
1276 acpi_gbl_enable_interpreter_slack = TRUE;
1277
1278 acpi_permanent_mmap = true;
1279
1280#ifdef CONFIG_X86
1281 /*
1282 * If the machine falls into the DMI check table,
1283 * DSDT will be copied to memory.
1284 * Note that calling dmi_check_system() here on other architectures
1285 * would not be OK because only x86 initializes dmi early enough.
1286 * Thankfully only x86 systems need such quirks for now.
1287 */
1288 dmi_check_system(dsdt_dmi_table);
1289#endif
1290
1291 status = acpi_reallocate_root_table();
1292 if (ACPI_FAILURE(status)) {
1293 pr_err("Unable to reallocate ACPI tables\n");
1294 goto error0;
1295 }
1296
1297 status = acpi_initialize_subsystem();
1298 if (ACPI_FAILURE(status)) {
1299 pr_err("Unable to initialize the ACPI Interpreter\n");
1300 goto error0;
1301 }
1302
1303#ifdef CONFIG_X86
1304 if (!acpi_ioapic) {
1305 /* compatible (0) means level (3) */
1306 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1307 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1308 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1309 }
1310 /* Set PIC-mode SCI trigger type */
1311 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1312 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1313 } else {
1314 /*
1315 * now that acpi_gbl_FADT is initialized,
1316 * update it with result from INT_SRC_OVR parsing
1317 */
1318 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1319 }
1320#endif
1321 return;
1322
1323 error0:
1324 disable_acpi();
1325}
1326
1327/**
1328 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1329 *
1330 * Switch over the platform to the ACPI mode (if possible).
1331 *
1332 * Doing this too early is generally unsafe, but at the same time it needs to be
1333 * done before all things that really depend on ACPI. The right spot appears to
1334 * be before finalizing the EFI initialization.
1335 */
1336void __init acpi_subsystem_init(void)
1337{
1338 acpi_status status;
1339
1340 if (acpi_disabled)
1341 return;
1342
1343 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1344 if (ACPI_FAILURE(status)) {
1345 pr_err("Unable to enable ACPI\n");
1346 disable_acpi();
1347 } else {
1348 /*
1349 * If the system is using ACPI then we can be reasonably
1350 * confident that any regulators are managed by the firmware
1351 * so tell the regulator core it has everything it needs to
1352 * know.
1353 */
1354 regulator_has_full_constraints();
1355 }
1356}
1357
1358static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1359{
1360 if (event == ACPI_TABLE_EVENT_LOAD)
1361 acpi_scan_table_notify();
1362
1363 return acpi_sysfs_table_handler(event, table, context);
1364}
1365
1366static int __init acpi_bus_init(void)
1367{
1368 int result;
1369 acpi_status status;
1370
1371 acpi_os_initialize1();
1372
1373 status = acpi_load_tables();
1374 if (ACPI_FAILURE(status)) {
1375 pr_err("Unable to load the System Description Tables\n");
1376 goto error1;
1377 }
1378
1379 /*
1380 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1381 * device is found in the namespace.
1382 *
1383 * This is accomplished by looking for the ECDT table and getting the EC
1384 * parameters out of that.
1385 *
1386 * Do that before calling acpi_initialize_objects() which may trigger EC
1387 * address space accesses.
1388 */
1389 acpi_ec_ecdt_probe();
1390
1391 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1392 if (ACPI_FAILURE(status)) {
1393 pr_err("Unable to start the ACPI Interpreter\n");
1394 goto error1;
1395 }
1396
1397 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1398 if (ACPI_FAILURE(status)) {
1399 pr_err("Unable to initialize ACPI objects\n");
1400 goto error1;
1401 }
1402
1403 /*
1404 * _OSC method may exist in module level code,
1405 * so it must be run after ACPI_FULL_INITIALIZATION
1406 */
1407 acpi_bus_osc_negotiate_platform_control();
1408 acpi_bus_osc_negotiate_usb_control();
1409
1410 /*
1411 * _PDC control method may load dynamic SSDT tables,
1412 * and we need to install the table handler before that.
1413 */
1414 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1415
1416 acpi_sysfs_init();
1417
1418 acpi_early_processor_control_setup();
1419
1420 /*
1421 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1422 * is necessary to enable it as early as possible.
1423 */
1424 acpi_ec_dsdt_probe();
1425
1426 pr_info("Interpreter enabled\n");
1427
1428 /* Initialize sleep structures */
1429 acpi_sleep_init();
1430
1431 /*
1432 * Get the system interrupt model and evaluate \_PIC.
1433 */
1434 result = acpi_bus_init_irq();
1435 if (result)
1436 goto error1;
1437
1438 /*
1439 * Register for all standard device notifications.
1440 */
1441 status =
1442 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1443 &acpi_bus_notify, NULL);
1444 if (ACPI_FAILURE(status)) {
1445 pr_err("Unable to register for system notifications\n");
1446 goto error1;
1447 }
1448
1449 /*
1450 * Create the top ACPI proc directory
1451 */
1452 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1453
1454 result = bus_register(&acpi_bus_type);
1455 if (!result)
1456 return 0;
1457
1458 /* Mimic structured exception handling */
1459 error1:
1460 acpi_terminate();
1461 return -ENODEV;
1462}
1463
1464struct kobject *acpi_kobj;
1465EXPORT_SYMBOL_GPL(acpi_kobj);
1466
1467void __weak __init acpi_arch_init(void) { }
1468
1469static int __init acpi_init(void)
1470{
1471 int result;
1472
1473 if (acpi_disabled) {
1474 pr_info("Interpreter disabled.\n");
1475 return -ENODEV;
1476 }
1477
1478 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1479 if (!acpi_kobj) {
1480 pr_err("Failed to register kobject\n");
1481 return -ENOMEM;
1482 }
1483
1484 init_prmt();
1485 acpi_init_pcc();
1486 result = acpi_bus_init();
1487 if (result) {
1488 kobject_put(acpi_kobj);
1489 disable_acpi();
1490 return result;
1491 }
1492 acpi_init_ffh();
1493
1494 pci_mmcfg_late_init();
1495 acpi_viot_early_init();
1496 acpi_hest_init();
1497 acpi_ghes_init();
1498 acpi_arch_init();
1499 acpi_scan_init();
1500 acpi_ec_init();
1501 acpi_debugfs_init();
1502 acpi_sleep_proc_init();
1503 acpi_wakeup_device_init();
1504 acpi_debugger_init();
1505 acpi_setup_sb_notify_handler();
1506 acpi_viot_init();
1507 return 0;
1508}
1509
1510subsys_initcall(acpi_init);