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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 <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
320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
322 if (IS_ENABLED(CONFIG_ACPI_PRMT))
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
324 if (IS_ENABLED(CONFIG_ACPI_FFH))
325 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
326
327#ifdef CONFIG_ARM64
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
329#endif
330#ifdef CONFIG_X86
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
332#endif
333
334#ifdef CONFIG_ACPI_CPPC_LIB
335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
337#endif
338
339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
340
341 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
343
344 if (IS_ENABLED(CONFIG_USB4))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
346
347 if (!ghes_disable)
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
349 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
350 return;
351
352 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
353 return;
354
355 capbuf_ret = context.ret.pointer;
356 if (context.ret.length <= OSC_SUPPORT_DWORD) {
357 kfree(context.ret.pointer);
358 return;
359 }
360
361 /*
362 * Now run _OSC again with query flag clear and with the caps
363 * supported by both the OS and the platform.
364 */
365 capbuf[OSC_QUERY_DWORD] = 0;
366 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
367 kfree(context.ret.pointer);
368
369 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
370 return;
371
372 capbuf_ret = context.ret.pointer;
373 if (context.ret.length > OSC_SUPPORT_DWORD) {
374#ifdef CONFIG_ACPI_CPPC_LIB
375 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
376#endif
377
378 osc_sb_apei_support_acked =
379 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
380 osc_pc_lpi_support_confirmed =
381 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
382 osc_sb_native_usb4_support_confirmed =
383 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
384 osc_cpc_flexible_adr_space_confirmed =
385 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
386 }
387
388 kfree(context.ret.pointer);
389}
390
391/*
392 * Native control of USB4 capabilities. If any of the tunneling bits is
393 * set it means OS is in control and we use software based connection
394 * manager.
395 */
396u32 osc_sb_native_usb4_control;
397EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
398
399static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
400{
401 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
402 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
403 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
404 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
405 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
406}
407
408static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
409static void acpi_bus_osc_negotiate_usb_control(void)
410{
411 u32 capbuf[3], *capbuf_ret;
412 struct acpi_osc_context context = {
413 .uuid_str = sb_usb_uuid_str,
414 .rev = 1,
415 .cap.length = sizeof(capbuf),
416 .cap.pointer = capbuf,
417 };
418 acpi_handle handle;
419 acpi_status status;
420 u32 control;
421
422 if (!osc_sb_native_usb4_support_confirmed)
423 return;
424
425 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
426 return;
427
428 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
429 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
430
431 /*
432 * Run _OSC first with query bit set, trying to get control over
433 * all tunneling. The platform can then clear out bits in the
434 * control dword that it does not want to grant to the OS.
435 */
436 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
437 capbuf[OSC_SUPPORT_DWORD] = 0;
438 capbuf[OSC_CONTROL_DWORD] = control;
439
440 status = acpi_run_osc(handle, &context);
441 if (ACPI_FAILURE(status))
442 return;
443
444 if (context.ret.length != sizeof(capbuf)) {
445 pr_info("USB4 _OSC: returned invalid length buffer\n");
446 goto out_free;
447 }
448
449 /*
450 * Run _OSC again now with query bit clear and the control dword
451 * matching what the platform granted (which may not have all
452 * the control bits set).
453 */
454 capbuf_ret = context.ret.pointer;
455
456 capbuf[OSC_QUERY_DWORD] = 0;
457 capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];
458
459 kfree(context.ret.pointer);
460
461 status = acpi_run_osc(handle, &context);
462 if (ACPI_FAILURE(status))
463 return;
464
465 if (context.ret.length != sizeof(capbuf)) {
466 pr_info("USB4 _OSC: returned invalid length buffer\n");
467 goto out_free;
468 }
469
470 osc_sb_native_usb4_control =
471 control & acpi_osc_ctx_get_pci_control(&context);
472
473 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
474 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
475 osc_sb_native_usb4_control);
476
477out_free:
478 kfree(context.ret.pointer);
479}
480
481/* --------------------------------------------------------------------------
482 Notification Handling
483 -------------------------------------------------------------------------- */
484
485/**
486 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
487 * @handle: Target ACPI object.
488 * @type: Notification type.
489 * @data: Ignored.
490 *
491 * This only handles notifications related to device hotplug.
492 */
493static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
494{
495 struct acpi_device *adev;
496
497 switch (type) {
498 case ACPI_NOTIFY_BUS_CHECK:
499 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
500 break;
501
502 case ACPI_NOTIFY_DEVICE_CHECK:
503 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
504 break;
505
506 case ACPI_NOTIFY_DEVICE_WAKE:
507 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
508 return;
509
510 case ACPI_NOTIFY_EJECT_REQUEST:
511 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
512 break;
513
514 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
515 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
516 /* TBD: Exactly what does 'light' mean? */
517 return;
518
519 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
520 acpi_handle_err(handle, "Device cannot be configured due "
521 "to a frequency mismatch\n");
522 return;
523
524 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
525 acpi_handle_err(handle, "Device cannot be configured due "
526 "to a bus mode mismatch\n");
527 return;
528
529 case ACPI_NOTIFY_POWER_FAULT:
530 acpi_handle_err(handle, "Device has suffered a power fault\n");
531 return;
532
533 default:
534 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
535 return;
536 }
537
538 adev = acpi_get_acpi_dev(handle);
539
540 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
541 return;
542
543 acpi_put_acpi_dev(adev);
544
545 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
546}
547
548static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
549{
550 struct acpi_device *device = data;
551 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
552
553 acpi_drv->ops.notify(device, event);
554}
555
556static int acpi_device_install_notify_handler(struct acpi_device *device,
557 struct acpi_driver *acpi_drv)
558{
559 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
560 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
561 acpi_status status;
562
563 status = acpi_install_notify_handler(device->handle, type,
564 acpi_notify_device, device);
565 if (ACPI_FAILURE(status))
566 return -EINVAL;
567
568 return 0;
569}
570
571static void acpi_device_remove_notify_handler(struct acpi_device *device,
572 struct acpi_driver *acpi_drv)
573{
574 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
575 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
576
577 acpi_remove_notify_handler(device->handle, type,
578 acpi_notify_device);
579
580 acpi_os_wait_events_complete();
581}
582
583int acpi_dev_install_notify_handler(struct acpi_device *adev,
584 u32 handler_type,
585 acpi_notify_handler handler, void *context)
586{
587 acpi_status status;
588
589 status = acpi_install_notify_handler(adev->handle, handler_type,
590 handler, context);
591 if (ACPI_FAILURE(status))
592 return -ENODEV;
593
594 return 0;
595}
596EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
597
598void acpi_dev_remove_notify_handler(struct acpi_device *adev,
599 u32 handler_type,
600 acpi_notify_handler handler)
601{
602 acpi_remove_notify_handler(adev->handle, handler_type, handler);
603 acpi_os_wait_events_complete();
604}
605EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
606
607/* Handle events targeting \_SB device (at present only graceful shutdown) */
608
609#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
610#define ACPI_SB_INDICATE_INTERVAL 10000
611
612static void sb_notify_work(struct work_struct *dummy)
613{
614 acpi_handle sb_handle;
615
616 orderly_poweroff(true);
617
618 /*
619 * After initiating graceful shutdown, the ACPI spec requires OSPM
620 * to evaluate _OST method once every 10seconds to indicate that
621 * the shutdown is in progress
622 */
623 acpi_get_handle(NULL, "\\_SB", &sb_handle);
624 while (1) {
625 pr_info("Graceful shutdown in progress.\n");
626 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
627 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
628 msleep(ACPI_SB_INDICATE_INTERVAL);
629 }
630}
631
632static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
633{
634 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
635
636 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
637 if (!work_busy(&acpi_sb_work))
638 schedule_work(&acpi_sb_work);
639 } else {
640 pr_warn("event %x is not supported by \\_SB device\n", event);
641 }
642}
643
644static int __init acpi_setup_sb_notify_handler(void)
645{
646 acpi_handle sb_handle;
647
648 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
649 return -ENXIO;
650
651 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
652 acpi_sb_notify, NULL)))
653 return -EINVAL;
654
655 return 0;
656}
657
658/* --------------------------------------------------------------------------
659 Device Matching
660 -------------------------------------------------------------------------- */
661
662/**
663 * acpi_get_first_physical_node - Get first physical node of an ACPI device
664 * @adev: ACPI device in question
665 *
666 * Return: First physical node of ACPI device @adev
667 */
668struct device *acpi_get_first_physical_node(struct acpi_device *adev)
669{
670 struct mutex *physical_node_lock = &adev->physical_node_lock;
671 struct device *phys_dev;
672
673 mutex_lock(physical_node_lock);
674 if (list_empty(&adev->physical_node_list)) {
675 phys_dev = NULL;
676 } else {
677 const struct acpi_device_physical_node *node;
678
679 node = list_first_entry(&adev->physical_node_list,
680 struct acpi_device_physical_node, node);
681
682 phys_dev = node->dev;
683 }
684 mutex_unlock(physical_node_lock);
685 return phys_dev;
686}
687EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
688
689static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
690 const struct device *dev)
691{
692 const struct device *phys_dev = acpi_get_first_physical_node(adev);
693
694 return phys_dev && phys_dev == dev ? adev : NULL;
695}
696
697/**
698 * acpi_device_is_first_physical_node - Is given dev first physical node
699 * @adev: ACPI companion device
700 * @dev: Physical device to check
701 *
702 * Function checks if given @dev is the first physical devices attached to
703 * the ACPI companion device. This distinction is needed in some cases
704 * where the same companion device is shared between many physical devices.
705 *
706 * Note that the caller have to provide valid @adev pointer.
707 */
708bool acpi_device_is_first_physical_node(struct acpi_device *adev,
709 const struct device *dev)
710{
711 return !!acpi_primary_dev_companion(adev, dev);
712}
713
714/*
715 * acpi_companion_match() - Can we match via ACPI companion device
716 * @dev: Device in question
717 *
718 * Check if the given device has an ACPI companion and if that companion has
719 * a valid list of PNP IDs, and if the device is the first (primary) physical
720 * device associated with it. Return the companion pointer if that's the case
721 * or NULL otherwise.
722 *
723 * If multiple physical devices are attached to a single ACPI companion, we need
724 * to be careful. The usage scenario for this kind of relationship is that all
725 * of the physical devices in question use resources provided by the ACPI
726 * companion. A typical case is an MFD device where all the sub-devices share
727 * the parent's ACPI companion. In such cases we can only allow the primary
728 * (first) physical device to be matched with the help of the companion's PNP
729 * IDs.
730 *
731 * Additional physical devices sharing the ACPI companion can still use
732 * resources available from it but they will be matched normally using functions
733 * provided by their bus types (and analogously for their modalias).
734 */
735const struct acpi_device *acpi_companion_match(const struct device *dev)
736{
737 struct acpi_device *adev;
738
739 adev = ACPI_COMPANION(dev);
740 if (!adev)
741 return NULL;
742
743 if (list_empty(&adev->pnp.ids))
744 return NULL;
745
746 return acpi_primary_dev_companion(adev, dev);
747}
748
749/**
750 * acpi_of_match_device - Match device object using the "compatible" property.
751 * @adev: ACPI device object to match.
752 * @of_match_table: List of device IDs to match against.
753 * @of_id: OF ID if matched
754 *
755 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
756 * identifiers and a _DSD object with the "compatible" property, use that
757 * property to match against the given list of identifiers.
758 */
759static bool acpi_of_match_device(const struct acpi_device *adev,
760 const struct of_device_id *of_match_table,
761 const struct of_device_id **of_id)
762{
763 const union acpi_object *of_compatible, *obj;
764 int i, nval;
765
766 if (!adev)
767 return false;
768
769 of_compatible = adev->data.of_compatible;
770 if (!of_match_table || !of_compatible)
771 return false;
772
773 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
774 nval = of_compatible->package.count;
775 obj = of_compatible->package.elements;
776 } else { /* Must be ACPI_TYPE_STRING. */
777 nval = 1;
778 obj = of_compatible;
779 }
780 /* Now we can look for the driver DT compatible strings */
781 for (i = 0; i < nval; i++, obj++) {
782 const struct of_device_id *id;
783
784 for (id = of_match_table; id->compatible[0]; id++)
785 if (!strcasecmp(obj->string.pointer, id->compatible)) {
786 if (of_id)
787 *of_id = id;
788 return true;
789 }
790 }
791
792 return false;
793}
794
795static bool acpi_of_modalias(struct acpi_device *adev,
796 char *modalias, size_t len)
797{
798 const union acpi_object *of_compatible;
799 const union acpi_object *obj;
800 const char *str, *chr;
801
802 of_compatible = adev->data.of_compatible;
803 if (!of_compatible)
804 return false;
805
806 if (of_compatible->type == ACPI_TYPE_PACKAGE)
807 obj = of_compatible->package.elements;
808 else /* Must be ACPI_TYPE_STRING. */
809 obj = of_compatible;
810
811 str = obj->string.pointer;
812 chr = strchr(str, ',');
813 strscpy(modalias, chr ? chr + 1 : str, len);
814
815 return true;
816}
817
818/**
819 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
820 * @adev: ACPI device object to match
821 * @default_id: ID string to use as default if no compatible string found
822 * @modalias: Pointer to buffer that modalias value will be copied into
823 * @len: Length of modalias buffer
824 *
825 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
826 * objects. If there is a compatible string for @adev, it will be copied to
827 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
828 * used.
829 */
830void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
831 char *modalias, size_t len)
832{
833 if (!acpi_of_modalias(adev, modalias, len))
834 strscpy(modalias, default_id, len);
835}
836EXPORT_SYMBOL_GPL(acpi_set_modalias);
837
838static bool __acpi_match_device_cls(const struct acpi_device_id *id,
839 struct acpi_hardware_id *hwid)
840{
841 int i, msk, byte_shift;
842 char buf[3];
843
844 if (!id->cls)
845 return false;
846
847 /* Apply class-code bitmask, before checking each class-code byte */
848 for (i = 1; i <= 3; i++) {
849 byte_shift = 8 * (3 - i);
850 msk = (id->cls_msk >> byte_shift) & 0xFF;
851 if (!msk)
852 continue;
853
854 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
855 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
856 return false;
857 }
858 return true;
859}
860
861static bool __acpi_match_device(const struct acpi_device *device,
862 const struct acpi_device_id *acpi_ids,
863 const struct of_device_id *of_ids,
864 const struct acpi_device_id **acpi_id,
865 const struct of_device_id **of_id)
866{
867 const struct acpi_device_id *id;
868 struct acpi_hardware_id *hwid;
869
870 /*
871 * If the device is not present, it is unnecessary to load device
872 * driver for it.
873 */
874 if (!device || !device->status.present)
875 return false;
876
877 list_for_each_entry(hwid, &device->pnp.ids, list) {
878 /* First, check the ACPI/PNP IDs provided by the caller. */
879 if (acpi_ids) {
880 for (id = acpi_ids; id->id[0] || id->cls; id++) {
881 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
882 goto out_acpi_match;
883 if (id->cls && __acpi_match_device_cls(id, hwid))
884 goto out_acpi_match;
885 }
886 }
887
888 /*
889 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
890 * "compatible" property if found.
891 */
892 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
893 return acpi_of_match_device(device, of_ids, of_id);
894 }
895 return false;
896
897out_acpi_match:
898 if (acpi_id)
899 *acpi_id = id;
900 return true;
901}
902
903/**
904 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
905 * @ids: Array of struct acpi_device_id objects to match against.
906 * @adev: The ACPI device pointer to match.
907 *
908 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
909 *
910 * Return:
911 * a pointer to the first matching ACPI ID on success or %NULL on failure.
912 */
913const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
914 const struct acpi_device *adev)
915{
916 const struct acpi_device_id *id = NULL;
917
918 __acpi_match_device(adev, ids, NULL, &id, NULL);
919 return id;
920}
921EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
922
923/**
924 * acpi_match_device - Match a struct device against a given list of ACPI IDs
925 * @ids: Array of struct acpi_device_id object to match against.
926 * @dev: The device structure to match.
927 *
928 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
929 * object for that handle and use that object to match against a given list of
930 * device IDs.
931 *
932 * Return a pointer to the first matching ID on success or %NULL on failure.
933 */
934const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
935 const struct device *dev)
936{
937 return acpi_match_acpi_device(ids, acpi_companion_match(dev));
938}
939EXPORT_SYMBOL_GPL(acpi_match_device);
940
941static const void *acpi_of_device_get_match_data(const struct device *dev)
942{
943 struct acpi_device *adev = ACPI_COMPANION(dev);
944 const struct of_device_id *match = NULL;
945
946 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
947 return NULL;
948
949 return match->data;
950}
951
952const void *acpi_device_get_match_data(const struct device *dev)
953{
954 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
955 const struct acpi_device_id *match;
956
957 if (!acpi_ids)
958 return acpi_of_device_get_match_data(dev);
959
960 match = acpi_match_device(acpi_ids, dev);
961 if (!match)
962 return NULL;
963
964 return (const void *)match->driver_data;
965}
966EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
967
968int acpi_match_device_ids(struct acpi_device *device,
969 const struct acpi_device_id *ids)
970{
971 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
972}
973EXPORT_SYMBOL(acpi_match_device_ids);
974
975bool acpi_driver_match_device(struct device *dev,
976 const struct device_driver *drv)
977{
978 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
979 const struct of_device_id *of_ids = drv->of_match_table;
980
981 if (!acpi_ids)
982 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
983
984 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
985}
986EXPORT_SYMBOL_GPL(acpi_driver_match_device);
987
988/* --------------------------------------------------------------------------
989 ACPI Driver Management
990 -------------------------------------------------------------------------- */
991
992/**
993 * acpi_bus_register_driver - register a driver with the ACPI bus
994 * @driver: driver being registered
995 *
996 * Registers a driver with the ACPI bus. Searches the namespace for all
997 * devices that match the driver's criteria and binds. Returns zero for
998 * success or a negative error status for failure.
999 */
1000int acpi_bus_register_driver(struct acpi_driver *driver)
1001{
1002 if (acpi_disabled)
1003 return -ENODEV;
1004 driver->drv.name = driver->name;
1005 driver->drv.bus = &acpi_bus_type;
1006 driver->drv.owner = driver->owner;
1007
1008 return driver_register(&driver->drv);
1009}
1010
1011EXPORT_SYMBOL(acpi_bus_register_driver);
1012
1013/**
1014 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1015 * @driver: driver to unregister
1016 *
1017 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1018 * devices that match the driver's criteria and unbinds.
1019 */
1020void acpi_bus_unregister_driver(struct acpi_driver *driver)
1021{
1022 driver_unregister(&driver->drv);
1023}
1024
1025EXPORT_SYMBOL(acpi_bus_unregister_driver);
1026
1027/* --------------------------------------------------------------------------
1028 ACPI Bus operations
1029 -------------------------------------------------------------------------- */
1030
1031static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1032{
1033 struct acpi_device *acpi_dev = to_acpi_device(dev);
1034 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1035
1036 return acpi_dev->flags.match_driver
1037 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1038}
1039
1040static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1041{
1042 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1043}
1044
1045static int acpi_device_probe(struct device *dev)
1046{
1047 struct acpi_device *acpi_dev = to_acpi_device(dev);
1048 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1049 int ret;
1050
1051 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1052 return -EINVAL;
1053
1054 if (!acpi_drv->ops.add)
1055 return -ENOSYS;
1056
1057 ret = acpi_drv->ops.add(acpi_dev);
1058 if (ret) {
1059 acpi_dev->driver_data = NULL;
1060 return ret;
1061 }
1062
1063 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1064 acpi_drv->name, acpi_dev->pnp.bus_id);
1065
1066 if (acpi_drv->ops.notify) {
1067 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1068 if (ret) {
1069 if (acpi_drv->ops.remove)
1070 acpi_drv->ops.remove(acpi_dev);
1071
1072 acpi_dev->driver_data = NULL;
1073 return ret;
1074 }
1075 }
1076
1077 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1078 acpi_dev->pnp.bus_id);
1079
1080 get_device(dev);
1081 return 0;
1082}
1083
1084static void acpi_device_remove(struct device *dev)
1085{
1086 struct acpi_device *acpi_dev = to_acpi_device(dev);
1087 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1088
1089 if (acpi_drv->ops.notify)
1090 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1091
1092 if (acpi_drv->ops.remove)
1093 acpi_drv->ops.remove(acpi_dev);
1094
1095 acpi_dev->driver_data = NULL;
1096
1097 put_device(dev);
1098}
1099
1100struct bus_type acpi_bus_type = {
1101 .name = "acpi",
1102 .match = acpi_bus_match,
1103 .probe = acpi_device_probe,
1104 .remove = acpi_device_remove,
1105 .uevent = acpi_device_uevent,
1106};
1107
1108int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1109{
1110 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1111}
1112EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1113
1114struct acpi_dev_walk_context {
1115 int (*fn)(struct acpi_device *, void *);
1116 void *data;
1117};
1118
1119static int acpi_dev_for_one_check(struct device *dev, void *context)
1120{
1121 struct acpi_dev_walk_context *adwc = context;
1122
1123 if (dev->bus != &acpi_bus_type)
1124 return 0;
1125
1126 return adwc->fn(to_acpi_device(dev), adwc->data);
1127}
1128EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1129
1130int acpi_dev_for_each_child(struct acpi_device *adev,
1131 int (*fn)(struct acpi_device *, void *), void *data)
1132{
1133 struct acpi_dev_walk_context adwc = {
1134 .fn = fn,
1135 .data = data,
1136 };
1137
1138 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1139}
1140
1141int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1142 int (*fn)(struct acpi_device *, void *),
1143 void *data)
1144{
1145 struct acpi_dev_walk_context adwc = {
1146 .fn = fn,
1147 .data = data,
1148 };
1149
1150 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1151}
1152
1153/* --------------------------------------------------------------------------
1154 Initialization/Cleanup
1155 -------------------------------------------------------------------------- */
1156
1157static int __init acpi_bus_init_irq(void)
1158{
1159 acpi_status status;
1160 char *message = NULL;
1161
1162
1163 /*
1164 * Let the system know what interrupt model we are using by
1165 * evaluating the \_PIC object, if exists.
1166 */
1167
1168 switch (acpi_irq_model) {
1169 case ACPI_IRQ_MODEL_PIC:
1170 message = "PIC";
1171 break;
1172 case ACPI_IRQ_MODEL_IOAPIC:
1173 message = "IOAPIC";
1174 break;
1175 case ACPI_IRQ_MODEL_IOSAPIC:
1176 message = "IOSAPIC";
1177 break;
1178 case ACPI_IRQ_MODEL_GIC:
1179 message = "GIC";
1180 break;
1181 case ACPI_IRQ_MODEL_PLATFORM:
1182 message = "platform specific model";
1183 break;
1184 case ACPI_IRQ_MODEL_LPIC:
1185 message = "LPIC";
1186 break;
1187 default:
1188 pr_info("Unknown interrupt routing model\n");
1189 return -ENODEV;
1190 }
1191
1192 pr_info("Using %s for interrupt routing\n", message);
1193
1194 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1195 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1196 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1197 return -ENODEV;
1198 }
1199
1200 return 0;
1201}
1202
1203/**
1204 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1205 *
1206 * The ACPI tables are accessible after this, but the handling of events has not
1207 * been initialized and the global lock is not available yet, so AML should not
1208 * be executed at this point.
1209 *
1210 * Doing this before switching the EFI runtime services to virtual mode allows
1211 * the EfiBootServices memory to be freed slightly earlier on boot.
1212 */
1213void __init acpi_early_init(void)
1214{
1215 acpi_status status;
1216
1217 if (acpi_disabled)
1218 return;
1219
1220 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1221
1222 /* enable workarounds, unless strict ACPI spec. compliance */
1223 if (!acpi_strict)
1224 acpi_gbl_enable_interpreter_slack = TRUE;
1225
1226 acpi_permanent_mmap = true;
1227
1228#ifdef CONFIG_X86
1229 /*
1230 * If the machine falls into the DMI check table,
1231 * DSDT will be copied to memory.
1232 * Note that calling dmi_check_system() here on other architectures
1233 * would not be OK because only x86 initializes dmi early enough.
1234 * Thankfully only x86 systems need such quirks for now.
1235 */
1236 dmi_check_system(dsdt_dmi_table);
1237#endif
1238
1239 status = acpi_reallocate_root_table();
1240 if (ACPI_FAILURE(status)) {
1241 pr_err("Unable to reallocate ACPI tables\n");
1242 goto error0;
1243 }
1244
1245 status = acpi_initialize_subsystem();
1246 if (ACPI_FAILURE(status)) {
1247 pr_err("Unable to initialize the ACPI Interpreter\n");
1248 goto error0;
1249 }
1250
1251#ifdef CONFIG_X86
1252 if (!acpi_ioapic) {
1253 /* compatible (0) means level (3) */
1254 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1255 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1256 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1257 }
1258 /* Set PIC-mode SCI trigger type */
1259 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1260 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1261 } else {
1262 /*
1263 * now that acpi_gbl_FADT is initialized,
1264 * update it with result from INT_SRC_OVR parsing
1265 */
1266 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1267 }
1268#endif
1269 return;
1270
1271 error0:
1272 disable_acpi();
1273}
1274
1275/**
1276 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1277 *
1278 * Switch over the platform to the ACPI mode (if possible).
1279 *
1280 * Doing this too early is generally unsafe, but at the same time it needs to be
1281 * done before all things that really depend on ACPI. The right spot appears to
1282 * be before finalizing the EFI initialization.
1283 */
1284void __init acpi_subsystem_init(void)
1285{
1286 acpi_status status;
1287
1288 if (acpi_disabled)
1289 return;
1290
1291 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1292 if (ACPI_FAILURE(status)) {
1293 pr_err("Unable to enable ACPI\n");
1294 disable_acpi();
1295 } else {
1296 /*
1297 * If the system is using ACPI then we can be reasonably
1298 * confident that any regulators are managed by the firmware
1299 * so tell the regulator core it has everything it needs to
1300 * know.
1301 */
1302 regulator_has_full_constraints();
1303 }
1304}
1305
1306static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1307{
1308 if (event == ACPI_TABLE_EVENT_LOAD)
1309 acpi_scan_table_notify();
1310
1311 return acpi_sysfs_table_handler(event, table, context);
1312}
1313
1314static int __init acpi_bus_init(void)
1315{
1316 int result;
1317 acpi_status status;
1318
1319 acpi_os_initialize1();
1320
1321 status = acpi_load_tables();
1322 if (ACPI_FAILURE(status)) {
1323 pr_err("Unable to load the System Description Tables\n");
1324 goto error1;
1325 }
1326
1327 /*
1328 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1329 * device is found in the namespace.
1330 *
1331 * This is accomplished by looking for the ECDT table and getting the EC
1332 * parameters out of that.
1333 *
1334 * Do that before calling acpi_initialize_objects() which may trigger EC
1335 * address space accesses.
1336 */
1337 acpi_ec_ecdt_probe();
1338
1339 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1340 if (ACPI_FAILURE(status)) {
1341 pr_err("Unable to start the ACPI Interpreter\n");
1342 goto error1;
1343 }
1344
1345 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1346 if (ACPI_FAILURE(status)) {
1347 pr_err("Unable to initialize ACPI objects\n");
1348 goto error1;
1349 }
1350
1351 /*
1352 * _OSC method may exist in module level code,
1353 * so it must be run after ACPI_FULL_INITIALIZATION
1354 */
1355 acpi_bus_osc_negotiate_platform_control();
1356 acpi_bus_osc_negotiate_usb_control();
1357
1358 /*
1359 * _PDC control method may load dynamic SSDT tables,
1360 * and we need to install the table handler before that.
1361 */
1362 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1363
1364 acpi_sysfs_init();
1365
1366 acpi_early_processor_control_setup();
1367
1368 /*
1369 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1370 * is necessary to enable it as early as possible.
1371 */
1372 acpi_ec_dsdt_probe();
1373
1374 pr_info("Interpreter enabled\n");
1375
1376 /* Initialize sleep structures */
1377 acpi_sleep_init();
1378
1379 /*
1380 * Get the system interrupt model and evaluate \_PIC.
1381 */
1382 result = acpi_bus_init_irq();
1383 if (result)
1384 goto error1;
1385
1386 /*
1387 * Register the for all standard device notifications.
1388 */
1389 status =
1390 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1391 &acpi_bus_notify, NULL);
1392 if (ACPI_FAILURE(status)) {
1393 pr_err("Unable to register for system notifications\n");
1394 goto error1;
1395 }
1396
1397 /*
1398 * Create the top ACPI proc directory
1399 */
1400 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1401
1402 result = bus_register(&acpi_bus_type);
1403 if (!result)
1404 return 0;
1405
1406 /* Mimic structured exception handling */
1407 error1:
1408 acpi_terminate();
1409 return -ENODEV;
1410}
1411
1412struct kobject *acpi_kobj;
1413EXPORT_SYMBOL_GPL(acpi_kobj);
1414
1415static int __init acpi_init(void)
1416{
1417 int result;
1418
1419 if (acpi_disabled) {
1420 pr_info("Interpreter disabled.\n");
1421 return -ENODEV;
1422 }
1423
1424 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1425 if (!acpi_kobj)
1426 pr_debug("%s: kset create error\n", __func__);
1427
1428 init_prmt();
1429 acpi_init_pcc();
1430 result = acpi_bus_init();
1431 if (result) {
1432 kobject_put(acpi_kobj);
1433 disable_acpi();
1434 return result;
1435 }
1436 acpi_init_ffh();
1437
1438 pci_mmcfg_late_init();
1439 acpi_viot_early_init();
1440 acpi_hest_init();
1441 acpi_ghes_init();
1442 acpi_arm_init();
1443 acpi_scan_init();
1444 acpi_ec_init();
1445 acpi_debugfs_init();
1446 acpi_sleep_proc_init();
1447 acpi_wakeup_device_init();
1448 acpi_debugger_init();
1449 acpi_setup_sb_notify_handler();
1450 acpi_viot_init();
1451 return 0;
1452}
1453
1454subsys_initcall(acpi_init);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
4 *
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 */
7
8#define pr_fmt(fmt) "ACPI: " fmt
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/ioport.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/sched.h>
16#include <linux/pm.h>
17#include <linux/device.h>
18#include <linux/proc_fs.h>
19#include <linux/acpi.h>
20#include <linux/slab.h>
21#include <linux/regulator/machine.h>
22#include <linux/workqueue.h>
23#include <linux/reboot.h>
24#include <linux/delay.h>
25#ifdef CONFIG_X86
26#include <asm/mpspec.h>
27#include <linux/dmi.h>
28#endif
29#include <linux/acpi_agdi.h>
30#include <linux/acpi_apmt.h>
31#include <linux/acpi_iort.h>
32#include <linux/acpi_viot.h>
33#include <linux/pci.h>
34#include <acpi/apei.h>
35#include <linux/suspend.h>
36#include <linux/prmt.h>
37
38#include "internal.h"
39
40struct acpi_device *acpi_root;
41struct proc_dir_entry *acpi_root_dir;
42EXPORT_SYMBOL(acpi_root_dir);
43
44#ifdef CONFIG_X86
45#ifdef CONFIG_ACPI_CUSTOM_DSDT
46static inline int set_copy_dsdt(const struct dmi_system_id *id)
47{
48 return 0;
49}
50#else
51static int set_copy_dsdt(const struct dmi_system_id *id)
52{
53 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
54 acpi_gbl_copy_dsdt_locally = 1;
55 return 0;
56}
57#endif
58
59static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
60 /*
61 * Invoke DSDT corruption work-around on all Toshiba Satellite.
62 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
63 */
64 {
65 .callback = set_copy_dsdt,
66 .ident = "TOSHIBA Satellite",
67 .matches = {
68 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
69 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
70 },
71 },
72 {}
73};
74#endif
75
76/* --------------------------------------------------------------------------
77 Device Management
78 -------------------------------------------------------------------------- */
79
80acpi_status acpi_bus_get_status_handle(acpi_handle handle,
81 unsigned long long *sta)
82{
83 acpi_status status;
84
85 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
86 if (ACPI_SUCCESS(status))
87 return AE_OK;
88
89 if (status == AE_NOT_FOUND) {
90 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
91 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
92 return AE_OK;
93 }
94 return status;
95}
96EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
97
98int acpi_bus_get_status(struct acpi_device *device)
99{
100 acpi_status status;
101 unsigned long long sta;
102
103 if (acpi_device_override_status(device, &sta)) {
104 acpi_set_device_status(device, sta);
105 return 0;
106 }
107
108 /* Battery devices must have their deps met before calling _STA */
109 if (acpi_device_is_battery(device) && device->dep_unmet) {
110 acpi_set_device_status(device, 0);
111 return 0;
112 }
113
114 status = acpi_bus_get_status_handle(device->handle, &sta);
115 if (ACPI_FAILURE(status))
116 return -ENODEV;
117
118 acpi_set_device_status(device, sta);
119
120 if (device->status.functional && !device->status.present) {
121 pr_debug("Device [%s] status [%08x]: functional but not present\n",
122 device->pnp.bus_id, (u32)sta);
123 }
124
125 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
126 return 0;
127}
128EXPORT_SYMBOL(acpi_bus_get_status);
129
130void acpi_bus_private_data_handler(acpi_handle handle,
131 void *context)
132{
133 return;
134}
135EXPORT_SYMBOL(acpi_bus_private_data_handler);
136
137int acpi_bus_attach_private_data(acpi_handle handle, void *data)
138{
139 acpi_status status;
140
141 status = acpi_attach_data(handle,
142 acpi_bus_private_data_handler, data);
143 if (ACPI_FAILURE(status)) {
144 acpi_handle_debug(handle, "Error attaching device data\n");
145 return -ENODEV;
146 }
147
148 return 0;
149}
150EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
151
152int acpi_bus_get_private_data(acpi_handle handle, void **data)
153{
154 acpi_status status;
155
156 if (!data)
157 return -EINVAL;
158
159 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
160 if (ACPI_FAILURE(status)) {
161 acpi_handle_debug(handle, "No context for object\n");
162 return -ENODEV;
163 }
164
165 return 0;
166}
167EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
168
169void acpi_bus_detach_private_data(acpi_handle handle)
170{
171 acpi_detach_data(handle, acpi_bus_private_data_handler);
172}
173EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
174
175static void acpi_print_osc_error(acpi_handle handle,
176 struct acpi_osc_context *context, char *error)
177{
178 int i;
179
180 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
181
182 pr_debug("_OSC request data:");
183 for (i = 0; i < context->cap.length; i += sizeof(u32))
184 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
185
186 pr_debug("\n");
187}
188
189acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
190{
191 acpi_status status;
192 struct acpi_object_list input;
193 union acpi_object in_params[4];
194 union acpi_object *out_obj;
195 guid_t guid;
196 u32 errors;
197 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
198
199 if (!context)
200 return AE_ERROR;
201 if (guid_parse(context->uuid_str, &guid))
202 return AE_ERROR;
203 context->ret.length = ACPI_ALLOCATE_BUFFER;
204 context->ret.pointer = NULL;
205
206 /* Setting up input parameters */
207 input.count = 4;
208 input.pointer = in_params;
209 in_params[0].type = ACPI_TYPE_BUFFER;
210 in_params[0].buffer.length = 16;
211 in_params[0].buffer.pointer = (u8 *)&guid;
212 in_params[1].type = ACPI_TYPE_INTEGER;
213 in_params[1].integer.value = context->rev;
214 in_params[2].type = ACPI_TYPE_INTEGER;
215 in_params[2].integer.value = context->cap.length/sizeof(u32);
216 in_params[3].type = ACPI_TYPE_BUFFER;
217 in_params[3].buffer.length = context->cap.length;
218 in_params[3].buffer.pointer = context->cap.pointer;
219
220 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
221 if (ACPI_FAILURE(status))
222 return status;
223
224 if (!output.length)
225 return AE_NULL_OBJECT;
226
227 out_obj = output.pointer;
228 if (out_obj->type != ACPI_TYPE_BUFFER
229 || out_obj->buffer.length != context->cap.length) {
230 acpi_print_osc_error(handle, context,
231 "_OSC evaluation returned wrong type");
232 status = AE_TYPE;
233 goto out_kfree;
234 }
235 /* Need to ignore the bit0 in result code */
236 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
237 if (errors) {
238 if (errors & OSC_REQUEST_ERROR)
239 acpi_print_osc_error(handle, context,
240 "_OSC request failed");
241 if (errors & OSC_INVALID_UUID_ERROR)
242 acpi_print_osc_error(handle, context,
243 "_OSC invalid UUID");
244 if (errors & OSC_INVALID_REVISION_ERROR)
245 acpi_print_osc_error(handle, context,
246 "_OSC invalid revision");
247 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
248 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
249 & OSC_QUERY_ENABLE)
250 goto out_success;
251 status = AE_SUPPORT;
252 goto out_kfree;
253 }
254 status = AE_ERROR;
255 goto out_kfree;
256 }
257out_success:
258 context->ret.length = out_obj->buffer.length;
259 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
260 context->ret.length, GFP_KERNEL);
261 if (!context->ret.pointer) {
262 status = AE_NO_MEMORY;
263 goto out_kfree;
264 }
265 status = AE_OK;
266
267out_kfree:
268 kfree(output.pointer);
269 return status;
270}
271EXPORT_SYMBOL(acpi_run_osc);
272
273bool osc_sb_apei_support_acked;
274
275/*
276 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
277 * OSPM supports platform coordinated low power idle(LPI) states
278 */
279bool osc_pc_lpi_support_confirmed;
280EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
281
282/*
283 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
284 * Starting with ACPI Specification 6.2, all _CPC registers can be in
285 * PCC, System Memory, System IO, or Functional Fixed Hardware address
286 * spaces. OSPM support for this more flexible register space scheme is
287 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
288 *
289 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
290 * - PCC or Functional Fixed Hardware address space if defined
291 * - SystemMemory address space (NULL register) if not defined
292 */
293bool osc_cpc_flexible_adr_space_confirmed;
294EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
295
296/*
297 * ACPI 6.4 Operating System Capabilities for USB.
298 */
299bool osc_sb_native_usb4_support_confirmed;
300EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
301
302bool osc_sb_cppc2_support_acked;
303
304static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
305static void acpi_bus_osc_negotiate_platform_control(void)
306{
307 u32 capbuf[2], *capbuf_ret;
308 struct acpi_osc_context context = {
309 .uuid_str = sb_uuid_str,
310 .rev = 1,
311 .cap.length = 8,
312 .cap.pointer = capbuf,
313 };
314 acpi_handle handle;
315
316 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
317 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
318 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
319 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
320 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
322
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
325 if (IS_ENABLED(CONFIG_ACPI_PRMT))
326 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
327 if (IS_ENABLED(CONFIG_ACPI_FFH))
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
329
330#ifdef CONFIG_ARM64
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
332#endif
333#ifdef CONFIG_X86
334 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
335#endif
336
337#ifdef CONFIG_ACPI_CPPC_LIB
338 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
340#endif
341
342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
343
344 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
346
347 if (IS_ENABLED(CONFIG_USB4))
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
349
350 if (!ghes_disable)
351 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
352 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
353 return;
354
355 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
356 return;
357
358 capbuf_ret = context.ret.pointer;
359 if (context.ret.length <= OSC_SUPPORT_DWORD) {
360 kfree(context.ret.pointer);
361 return;
362 }
363
364 /*
365 * Now run _OSC again with query flag clear and with the caps
366 * supported by both the OS and the platform.
367 */
368 capbuf[OSC_QUERY_DWORD] = 0;
369 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
370 kfree(context.ret.pointer);
371
372 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
373 return;
374
375 capbuf_ret = context.ret.pointer;
376 if (context.ret.length > OSC_SUPPORT_DWORD) {
377#ifdef CONFIG_ACPI_CPPC_LIB
378 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
379#endif
380
381 osc_sb_apei_support_acked =
382 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
383 osc_pc_lpi_support_confirmed =
384 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
385 osc_sb_native_usb4_support_confirmed =
386 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
387 osc_cpc_flexible_adr_space_confirmed =
388 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
389 }
390
391 kfree(context.ret.pointer);
392}
393
394/*
395 * Native control of USB4 capabilities. If any of the tunneling bits is
396 * set it means OS is in control and we use software based connection
397 * manager.
398 */
399u32 osc_sb_native_usb4_control;
400EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
401
402static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
403{
404 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
405 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
406 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
407 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
408 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
409}
410
411static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
412static void acpi_bus_osc_negotiate_usb_control(void)
413{
414 u32 capbuf[3];
415 struct acpi_osc_context context = {
416 .uuid_str = sb_usb_uuid_str,
417 .rev = 1,
418 .cap.length = sizeof(capbuf),
419 .cap.pointer = capbuf,
420 };
421 acpi_handle handle;
422 acpi_status status;
423 u32 control;
424
425 if (!osc_sb_native_usb4_support_confirmed)
426 return;
427
428 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
429 return;
430
431 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
432 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
433
434 capbuf[OSC_QUERY_DWORD] = 0;
435 capbuf[OSC_SUPPORT_DWORD] = 0;
436 capbuf[OSC_CONTROL_DWORD] = control;
437
438 status = acpi_run_osc(handle, &context);
439 if (ACPI_FAILURE(status))
440 return;
441
442 if (context.ret.length != sizeof(capbuf)) {
443 pr_info("USB4 _OSC: returned invalid length buffer\n");
444 goto out_free;
445 }
446
447 osc_sb_native_usb4_control =
448 control & acpi_osc_ctx_get_pci_control(&context);
449
450 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
451 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
452 osc_sb_native_usb4_control);
453
454out_free:
455 kfree(context.ret.pointer);
456}
457
458/* --------------------------------------------------------------------------
459 Notification Handling
460 -------------------------------------------------------------------------- */
461
462/*
463 * acpi_bus_notify
464 * ---------------
465 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
466 */
467static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
468{
469 struct acpi_device *adev;
470 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
471 bool hotplug_event = false;
472
473 switch (type) {
474 case ACPI_NOTIFY_BUS_CHECK:
475 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
476 hotplug_event = true;
477 break;
478
479 case ACPI_NOTIFY_DEVICE_CHECK:
480 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
481 hotplug_event = true;
482 break;
483
484 case ACPI_NOTIFY_DEVICE_WAKE:
485 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
486 break;
487
488 case ACPI_NOTIFY_EJECT_REQUEST:
489 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
490 hotplug_event = true;
491 break;
492
493 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
494 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
495 /* TBD: Exactly what does 'light' mean? */
496 break;
497
498 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
499 acpi_handle_err(handle, "Device cannot be configured due "
500 "to a frequency mismatch\n");
501 break;
502
503 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
504 acpi_handle_err(handle, "Device cannot be configured due "
505 "to a bus mode mismatch\n");
506 break;
507
508 case ACPI_NOTIFY_POWER_FAULT:
509 acpi_handle_err(handle, "Device has suffered a power fault\n");
510 break;
511
512 default:
513 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
514 break;
515 }
516
517 adev = acpi_get_acpi_dev(handle);
518 if (!adev)
519 goto err;
520
521 if (adev->dev.driver) {
522 struct acpi_driver *driver = to_acpi_driver(adev->dev.driver);
523
524 if (driver && driver->ops.notify &&
525 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
526 driver->ops.notify(adev, type);
527 }
528
529 if (!hotplug_event) {
530 acpi_put_acpi_dev(adev);
531 return;
532 }
533
534 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
535 return;
536
537 acpi_put_acpi_dev(adev);
538
539 err:
540 acpi_evaluate_ost(handle, type, ost_code, NULL);
541}
542
543static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
544{
545 struct acpi_device *device = data;
546 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
547
548 acpi_drv->ops.notify(device, event);
549}
550
551static void acpi_notify_device_fixed(void *data)
552{
553 struct acpi_device *device = data;
554
555 /* Fixed hardware devices have no handles */
556 acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
557}
558
559static u32 acpi_device_fixed_event(void *data)
560{
561 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
562 return ACPI_INTERRUPT_HANDLED;
563}
564
565static int acpi_device_install_notify_handler(struct acpi_device *device)
566{
567 acpi_status status;
568
569 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
570 status =
571 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
572 acpi_device_fixed_event,
573 device);
574 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
575 status =
576 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
577 acpi_device_fixed_event,
578 device);
579 else
580 status = acpi_install_notify_handler(device->handle,
581 ACPI_DEVICE_NOTIFY,
582 acpi_notify_device,
583 device);
584
585 if (ACPI_FAILURE(status))
586 return -EINVAL;
587 return 0;
588}
589
590static void acpi_device_remove_notify_handler(struct acpi_device *device)
591{
592 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
593 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
594 acpi_device_fixed_event);
595 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
596 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
597 acpi_device_fixed_event);
598 else
599 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
600 acpi_notify_device);
601}
602
603/* Handle events targeting \_SB device (at present only graceful shutdown) */
604
605#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
606#define ACPI_SB_INDICATE_INTERVAL 10000
607
608static void sb_notify_work(struct work_struct *dummy)
609{
610 acpi_handle sb_handle;
611
612 orderly_poweroff(true);
613
614 /*
615 * After initiating graceful shutdown, the ACPI spec requires OSPM
616 * to evaluate _OST method once every 10seconds to indicate that
617 * the shutdown is in progress
618 */
619 acpi_get_handle(NULL, "\\_SB", &sb_handle);
620 while (1) {
621 pr_info("Graceful shutdown in progress.\n");
622 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
623 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
624 msleep(ACPI_SB_INDICATE_INTERVAL);
625 }
626}
627
628static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
629{
630 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
631
632 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
633 if (!work_busy(&acpi_sb_work))
634 schedule_work(&acpi_sb_work);
635 } else
636 pr_warn("event %x is not supported by \\_SB device\n", event);
637}
638
639static int __init acpi_setup_sb_notify_handler(void)
640{
641 acpi_handle sb_handle;
642
643 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
644 return -ENXIO;
645
646 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
647 acpi_sb_notify, NULL)))
648 return -EINVAL;
649
650 return 0;
651}
652
653/* --------------------------------------------------------------------------
654 Device Matching
655 -------------------------------------------------------------------------- */
656
657/**
658 * acpi_get_first_physical_node - Get first physical node of an ACPI device
659 * @adev: ACPI device in question
660 *
661 * Return: First physical node of ACPI device @adev
662 */
663struct device *acpi_get_first_physical_node(struct acpi_device *adev)
664{
665 struct mutex *physical_node_lock = &adev->physical_node_lock;
666 struct device *phys_dev;
667
668 mutex_lock(physical_node_lock);
669 if (list_empty(&adev->physical_node_list)) {
670 phys_dev = NULL;
671 } else {
672 const struct acpi_device_physical_node *node;
673
674 node = list_first_entry(&adev->physical_node_list,
675 struct acpi_device_physical_node, node);
676
677 phys_dev = node->dev;
678 }
679 mutex_unlock(physical_node_lock);
680 return phys_dev;
681}
682EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
683
684static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
685 const struct device *dev)
686{
687 const struct device *phys_dev = acpi_get_first_physical_node(adev);
688
689 return phys_dev && phys_dev == dev ? adev : NULL;
690}
691
692/**
693 * acpi_device_is_first_physical_node - Is given dev first physical node
694 * @adev: ACPI companion device
695 * @dev: Physical device to check
696 *
697 * Function checks if given @dev is the first physical devices attached to
698 * the ACPI companion device. This distinction is needed in some cases
699 * where the same companion device is shared between many physical devices.
700 *
701 * Note that the caller have to provide valid @adev pointer.
702 */
703bool acpi_device_is_first_physical_node(struct acpi_device *adev,
704 const struct device *dev)
705{
706 return !!acpi_primary_dev_companion(adev, dev);
707}
708
709/*
710 * acpi_companion_match() - Can we match via ACPI companion device
711 * @dev: Device in question
712 *
713 * Check if the given device has an ACPI companion and if that companion has
714 * a valid list of PNP IDs, and if the device is the first (primary) physical
715 * device associated with it. Return the companion pointer if that's the case
716 * or NULL otherwise.
717 *
718 * If multiple physical devices are attached to a single ACPI companion, we need
719 * to be careful. The usage scenario for this kind of relationship is that all
720 * of the physical devices in question use resources provided by the ACPI
721 * companion. A typical case is an MFD device where all the sub-devices share
722 * the parent's ACPI companion. In such cases we can only allow the primary
723 * (first) physical device to be matched with the help of the companion's PNP
724 * IDs.
725 *
726 * Additional physical devices sharing the ACPI companion can still use
727 * resources available from it but they will be matched normally using functions
728 * provided by their bus types (and analogously for their modalias).
729 */
730struct acpi_device *acpi_companion_match(const struct device *dev)
731{
732 struct acpi_device *adev;
733
734 adev = ACPI_COMPANION(dev);
735 if (!adev)
736 return NULL;
737
738 if (list_empty(&adev->pnp.ids))
739 return NULL;
740
741 return acpi_primary_dev_companion(adev, dev);
742}
743
744/**
745 * acpi_of_match_device - Match device object using the "compatible" property.
746 * @adev: ACPI device object to match.
747 * @of_match_table: List of device IDs to match against.
748 * @of_id: OF ID if matched
749 *
750 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
751 * identifiers and a _DSD object with the "compatible" property, use that
752 * property to match against the given list of identifiers.
753 */
754static bool acpi_of_match_device(struct acpi_device *adev,
755 const struct of_device_id *of_match_table,
756 const struct of_device_id **of_id)
757{
758 const union acpi_object *of_compatible, *obj;
759 int i, nval;
760
761 if (!adev)
762 return false;
763
764 of_compatible = adev->data.of_compatible;
765 if (!of_match_table || !of_compatible)
766 return false;
767
768 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
769 nval = of_compatible->package.count;
770 obj = of_compatible->package.elements;
771 } else { /* Must be ACPI_TYPE_STRING. */
772 nval = 1;
773 obj = of_compatible;
774 }
775 /* Now we can look for the driver DT compatible strings */
776 for (i = 0; i < nval; i++, obj++) {
777 const struct of_device_id *id;
778
779 for (id = of_match_table; id->compatible[0]; id++)
780 if (!strcasecmp(obj->string.pointer, id->compatible)) {
781 if (of_id)
782 *of_id = id;
783 return true;
784 }
785 }
786
787 return false;
788}
789
790static bool acpi_of_modalias(struct acpi_device *adev,
791 char *modalias, size_t len)
792{
793 const union acpi_object *of_compatible;
794 const union acpi_object *obj;
795 const char *str, *chr;
796
797 of_compatible = adev->data.of_compatible;
798 if (!of_compatible)
799 return false;
800
801 if (of_compatible->type == ACPI_TYPE_PACKAGE)
802 obj = of_compatible->package.elements;
803 else /* Must be ACPI_TYPE_STRING. */
804 obj = of_compatible;
805
806 str = obj->string.pointer;
807 chr = strchr(str, ',');
808 strscpy(modalias, chr ? chr + 1 : str, len);
809
810 return true;
811}
812
813/**
814 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
815 * @adev: ACPI device object to match
816 * @default_id: ID string to use as default if no compatible string found
817 * @modalias: Pointer to buffer that modalias value will be copied into
818 * @len: Length of modalias buffer
819 *
820 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
821 * If there is a compatible string for @adev, it will be copied to @modalias
822 * with the vendor prefix stripped; otherwise, @default_id will be used.
823 */
824void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
825 char *modalias, size_t len)
826{
827 if (!acpi_of_modalias(adev, modalias, len))
828 strscpy(modalias, default_id, len);
829}
830EXPORT_SYMBOL_GPL(acpi_set_modalias);
831
832static bool __acpi_match_device_cls(const struct acpi_device_id *id,
833 struct acpi_hardware_id *hwid)
834{
835 int i, msk, byte_shift;
836 char buf[3];
837
838 if (!id->cls)
839 return false;
840
841 /* Apply class-code bitmask, before checking each class-code byte */
842 for (i = 1; i <= 3; i++) {
843 byte_shift = 8 * (3 - i);
844 msk = (id->cls_msk >> byte_shift) & 0xFF;
845 if (!msk)
846 continue;
847
848 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
849 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
850 return false;
851 }
852 return true;
853}
854
855static bool __acpi_match_device(struct acpi_device *device,
856 const struct acpi_device_id *acpi_ids,
857 const struct of_device_id *of_ids,
858 const struct acpi_device_id **acpi_id,
859 const struct of_device_id **of_id)
860{
861 const struct acpi_device_id *id;
862 struct acpi_hardware_id *hwid;
863
864 /*
865 * If the device is not present, it is unnecessary to load device
866 * driver for it.
867 */
868 if (!device || !device->status.present)
869 return false;
870
871 list_for_each_entry(hwid, &device->pnp.ids, list) {
872 /* First, check the ACPI/PNP IDs provided by the caller. */
873 if (acpi_ids) {
874 for (id = acpi_ids; id->id[0] || id->cls; id++) {
875 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
876 goto out_acpi_match;
877 if (id->cls && __acpi_match_device_cls(id, hwid))
878 goto out_acpi_match;
879 }
880 }
881
882 /*
883 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
884 * "compatible" property if found.
885 */
886 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
887 return acpi_of_match_device(device, of_ids, of_id);
888 }
889 return false;
890
891out_acpi_match:
892 if (acpi_id)
893 *acpi_id = id;
894 return true;
895}
896
897/**
898 * acpi_match_device - Match a struct device against a given list of ACPI IDs
899 * @ids: Array of struct acpi_device_id object to match against.
900 * @dev: The device structure to match.
901 *
902 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
903 * object for that handle and use that object to match against a given list of
904 * device IDs.
905 *
906 * Return a pointer to the first matching ID on success or %NULL on failure.
907 */
908const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
909 const struct device *dev)
910{
911 const struct acpi_device_id *id = NULL;
912
913 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
914 return id;
915}
916EXPORT_SYMBOL_GPL(acpi_match_device);
917
918static const void *acpi_of_device_get_match_data(const struct device *dev)
919{
920 struct acpi_device *adev = ACPI_COMPANION(dev);
921 const struct of_device_id *match = NULL;
922
923 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
924 return NULL;
925
926 return match->data;
927}
928
929const void *acpi_device_get_match_data(const struct device *dev)
930{
931 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
932 const struct acpi_device_id *match;
933
934 if (!acpi_ids)
935 return acpi_of_device_get_match_data(dev);
936
937 match = acpi_match_device(acpi_ids, dev);
938 if (!match)
939 return NULL;
940
941 return (const void *)match->driver_data;
942}
943EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
944
945int acpi_match_device_ids(struct acpi_device *device,
946 const struct acpi_device_id *ids)
947{
948 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
949}
950EXPORT_SYMBOL(acpi_match_device_ids);
951
952bool acpi_driver_match_device(struct device *dev,
953 const struct device_driver *drv)
954{
955 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
956 const struct of_device_id *of_ids = drv->of_match_table;
957
958 if (!acpi_ids)
959 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
960
961 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
962}
963EXPORT_SYMBOL_GPL(acpi_driver_match_device);
964
965/* --------------------------------------------------------------------------
966 ACPI Driver Management
967 -------------------------------------------------------------------------- */
968
969/**
970 * acpi_bus_register_driver - register a driver with the ACPI bus
971 * @driver: driver being registered
972 *
973 * Registers a driver with the ACPI bus. Searches the namespace for all
974 * devices that match the driver's criteria and binds. Returns zero for
975 * success or a negative error status for failure.
976 */
977int acpi_bus_register_driver(struct acpi_driver *driver)
978{
979 if (acpi_disabled)
980 return -ENODEV;
981 driver->drv.name = driver->name;
982 driver->drv.bus = &acpi_bus_type;
983 driver->drv.owner = driver->owner;
984
985 return driver_register(&driver->drv);
986}
987
988EXPORT_SYMBOL(acpi_bus_register_driver);
989
990/**
991 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
992 * @driver: driver to unregister
993 *
994 * Unregisters a driver with the ACPI bus. Searches the namespace for all
995 * devices that match the driver's criteria and unbinds.
996 */
997void acpi_bus_unregister_driver(struct acpi_driver *driver)
998{
999 driver_unregister(&driver->drv);
1000}
1001
1002EXPORT_SYMBOL(acpi_bus_unregister_driver);
1003
1004/* --------------------------------------------------------------------------
1005 ACPI Bus operations
1006 -------------------------------------------------------------------------- */
1007
1008static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1009{
1010 struct acpi_device *acpi_dev = to_acpi_device(dev);
1011 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1012
1013 return acpi_dev->flags.match_driver
1014 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1015}
1016
1017static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1018{
1019 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1020}
1021
1022static int acpi_device_probe(struct device *dev)
1023{
1024 struct acpi_device *acpi_dev = to_acpi_device(dev);
1025 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1026 int ret;
1027
1028 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1029 return -EINVAL;
1030
1031 if (!acpi_drv->ops.add)
1032 return -ENOSYS;
1033
1034 ret = acpi_drv->ops.add(acpi_dev);
1035 if (ret)
1036 return ret;
1037
1038 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1039 acpi_drv->name, acpi_dev->pnp.bus_id);
1040
1041 if (acpi_drv->ops.notify) {
1042 ret = acpi_device_install_notify_handler(acpi_dev);
1043 if (ret) {
1044 if (acpi_drv->ops.remove)
1045 acpi_drv->ops.remove(acpi_dev);
1046
1047 acpi_dev->driver_data = NULL;
1048 return ret;
1049 }
1050 }
1051
1052 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1053 acpi_dev->pnp.bus_id);
1054
1055 get_device(dev);
1056 return 0;
1057}
1058
1059static void acpi_device_remove(struct device *dev)
1060{
1061 struct acpi_device *acpi_dev = to_acpi_device(dev);
1062 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1063
1064 if (acpi_drv->ops.notify)
1065 acpi_device_remove_notify_handler(acpi_dev);
1066
1067 if (acpi_drv->ops.remove)
1068 acpi_drv->ops.remove(acpi_dev);
1069
1070 acpi_dev->driver_data = NULL;
1071
1072 put_device(dev);
1073}
1074
1075struct bus_type acpi_bus_type = {
1076 .name = "acpi",
1077 .match = acpi_bus_match,
1078 .probe = acpi_device_probe,
1079 .remove = acpi_device_remove,
1080 .uevent = acpi_device_uevent,
1081};
1082
1083int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1084{
1085 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1086}
1087EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1088
1089struct acpi_dev_walk_context {
1090 int (*fn)(struct acpi_device *, void *);
1091 void *data;
1092};
1093
1094static int acpi_dev_for_one_check(struct device *dev, void *context)
1095{
1096 struct acpi_dev_walk_context *adwc = context;
1097
1098 if (dev->bus != &acpi_bus_type)
1099 return 0;
1100
1101 return adwc->fn(to_acpi_device(dev), adwc->data);
1102}
1103EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1104
1105int acpi_dev_for_each_child(struct acpi_device *adev,
1106 int (*fn)(struct acpi_device *, void *), void *data)
1107{
1108 struct acpi_dev_walk_context adwc = {
1109 .fn = fn,
1110 .data = data,
1111 };
1112
1113 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1114}
1115
1116int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1117 int (*fn)(struct acpi_device *, void *),
1118 void *data)
1119{
1120 struct acpi_dev_walk_context adwc = {
1121 .fn = fn,
1122 .data = data,
1123 };
1124
1125 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1126}
1127
1128/* --------------------------------------------------------------------------
1129 Initialization/Cleanup
1130 -------------------------------------------------------------------------- */
1131
1132static int __init acpi_bus_init_irq(void)
1133{
1134 acpi_status status;
1135 char *message = NULL;
1136
1137
1138 /*
1139 * Let the system know what interrupt model we are using by
1140 * evaluating the \_PIC object, if exists.
1141 */
1142
1143 switch (acpi_irq_model) {
1144 case ACPI_IRQ_MODEL_PIC:
1145 message = "PIC";
1146 break;
1147 case ACPI_IRQ_MODEL_IOAPIC:
1148 message = "IOAPIC";
1149 break;
1150 case ACPI_IRQ_MODEL_IOSAPIC:
1151 message = "IOSAPIC";
1152 break;
1153 case ACPI_IRQ_MODEL_GIC:
1154 message = "GIC";
1155 break;
1156 case ACPI_IRQ_MODEL_PLATFORM:
1157 message = "platform specific model";
1158 break;
1159 case ACPI_IRQ_MODEL_LPIC:
1160 message = "LPIC";
1161 break;
1162 default:
1163 pr_info("Unknown interrupt routing model\n");
1164 return -ENODEV;
1165 }
1166
1167 pr_info("Using %s for interrupt routing\n", message);
1168
1169 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1170 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1171 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1172 return -ENODEV;
1173 }
1174
1175 return 0;
1176}
1177
1178/**
1179 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1180 *
1181 * The ACPI tables are accessible after this, but the handling of events has not
1182 * been initialized and the global lock is not available yet, so AML should not
1183 * be executed at this point.
1184 *
1185 * Doing this before switching the EFI runtime services to virtual mode allows
1186 * the EfiBootServices memory to be freed slightly earlier on boot.
1187 */
1188void __init acpi_early_init(void)
1189{
1190 acpi_status status;
1191
1192 if (acpi_disabled)
1193 return;
1194
1195 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1196
1197 /* enable workarounds, unless strict ACPI spec. compliance */
1198 if (!acpi_strict)
1199 acpi_gbl_enable_interpreter_slack = TRUE;
1200
1201 acpi_permanent_mmap = true;
1202
1203#ifdef CONFIG_X86
1204 /*
1205 * If the machine falls into the DMI check table,
1206 * DSDT will be copied to memory.
1207 * Note that calling dmi_check_system() here on other architectures
1208 * would not be OK because only x86 initializes dmi early enough.
1209 * Thankfully only x86 systems need such quirks for now.
1210 */
1211 dmi_check_system(dsdt_dmi_table);
1212#endif
1213
1214 status = acpi_reallocate_root_table();
1215 if (ACPI_FAILURE(status)) {
1216 pr_err("Unable to reallocate ACPI tables\n");
1217 goto error0;
1218 }
1219
1220 status = acpi_initialize_subsystem();
1221 if (ACPI_FAILURE(status)) {
1222 pr_err("Unable to initialize the ACPI Interpreter\n");
1223 goto error0;
1224 }
1225
1226#ifdef CONFIG_X86
1227 if (!acpi_ioapic) {
1228 /* compatible (0) means level (3) */
1229 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1230 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1231 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1232 }
1233 /* Set PIC-mode SCI trigger type */
1234 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1235 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1236 } else {
1237 /*
1238 * now that acpi_gbl_FADT is initialized,
1239 * update it with result from INT_SRC_OVR parsing
1240 */
1241 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1242 }
1243#endif
1244 return;
1245
1246 error0:
1247 disable_acpi();
1248}
1249
1250/**
1251 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1252 *
1253 * Switch over the platform to the ACPI mode (if possible).
1254 *
1255 * Doing this too early is generally unsafe, but at the same time it needs to be
1256 * done before all things that really depend on ACPI. The right spot appears to
1257 * be before finalizing the EFI initialization.
1258 */
1259void __init acpi_subsystem_init(void)
1260{
1261 acpi_status status;
1262
1263 if (acpi_disabled)
1264 return;
1265
1266 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1267 if (ACPI_FAILURE(status)) {
1268 pr_err("Unable to enable ACPI\n");
1269 disable_acpi();
1270 } else {
1271 /*
1272 * If the system is using ACPI then we can be reasonably
1273 * confident that any regulators are managed by the firmware
1274 * so tell the regulator core it has everything it needs to
1275 * know.
1276 */
1277 regulator_has_full_constraints();
1278 }
1279}
1280
1281static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1282{
1283 if (event == ACPI_TABLE_EVENT_LOAD)
1284 acpi_scan_table_notify();
1285
1286 return acpi_sysfs_table_handler(event, table, context);
1287}
1288
1289static int __init acpi_bus_init(void)
1290{
1291 int result;
1292 acpi_status status;
1293
1294 acpi_os_initialize1();
1295
1296 status = acpi_load_tables();
1297 if (ACPI_FAILURE(status)) {
1298 pr_err("Unable to load the System Description Tables\n");
1299 goto error1;
1300 }
1301
1302 /*
1303 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1304 * device is found in the namespace.
1305 *
1306 * This is accomplished by looking for the ECDT table and getting the EC
1307 * parameters out of that.
1308 *
1309 * Do that before calling acpi_initialize_objects() which may trigger EC
1310 * address space accesses.
1311 */
1312 acpi_ec_ecdt_probe();
1313
1314 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1315 if (ACPI_FAILURE(status)) {
1316 pr_err("Unable to start the ACPI Interpreter\n");
1317 goto error1;
1318 }
1319
1320 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1321 if (ACPI_FAILURE(status)) {
1322 pr_err("Unable to initialize ACPI objects\n");
1323 goto error1;
1324 }
1325
1326 /* Set capability bits for _OSC under processor scope */
1327 acpi_early_processor_osc();
1328
1329 /*
1330 * _OSC method may exist in module level code,
1331 * so it must be run after ACPI_FULL_INITIALIZATION
1332 */
1333 acpi_bus_osc_negotiate_platform_control();
1334 acpi_bus_osc_negotiate_usb_control();
1335
1336 /*
1337 * _PDC control method may load dynamic SSDT tables,
1338 * and we need to install the table handler before that.
1339 */
1340 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1341
1342 acpi_sysfs_init();
1343
1344 acpi_early_processor_set_pdc();
1345
1346 /*
1347 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1348 * is necessary to enable it as early as possible.
1349 */
1350 acpi_ec_dsdt_probe();
1351
1352 pr_info("Interpreter enabled\n");
1353
1354 /* Initialize sleep structures */
1355 acpi_sleep_init();
1356
1357 /*
1358 * Get the system interrupt model and evaluate \_PIC.
1359 */
1360 result = acpi_bus_init_irq();
1361 if (result)
1362 goto error1;
1363
1364 /*
1365 * Register the for all standard device notifications.
1366 */
1367 status =
1368 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1369 &acpi_bus_notify, NULL);
1370 if (ACPI_FAILURE(status)) {
1371 pr_err("Unable to register for system notifications\n");
1372 goto error1;
1373 }
1374
1375 /*
1376 * Create the top ACPI proc directory
1377 */
1378 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1379
1380 result = bus_register(&acpi_bus_type);
1381 if (!result)
1382 return 0;
1383
1384 /* Mimic structured exception handling */
1385 error1:
1386 acpi_terminate();
1387 return -ENODEV;
1388}
1389
1390struct kobject *acpi_kobj;
1391EXPORT_SYMBOL_GPL(acpi_kobj);
1392
1393static int __init acpi_init(void)
1394{
1395 int result;
1396
1397 if (acpi_disabled) {
1398 pr_info("Interpreter disabled.\n");
1399 return -ENODEV;
1400 }
1401
1402 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1403 if (!acpi_kobj)
1404 pr_debug("%s: kset create error\n", __func__);
1405
1406 init_prmt();
1407 acpi_init_pcc();
1408 result = acpi_bus_init();
1409 if (result) {
1410 kobject_put(acpi_kobj);
1411 disable_acpi();
1412 return result;
1413 }
1414 acpi_init_ffh();
1415
1416 pci_mmcfg_late_init();
1417 acpi_iort_init();
1418 acpi_viot_early_init();
1419 acpi_hest_init();
1420 acpi_ghes_init();
1421 acpi_scan_init();
1422 acpi_ec_init();
1423 acpi_debugfs_init();
1424 acpi_sleep_proc_init();
1425 acpi_wakeup_device_init();
1426 acpi_debugger_init();
1427 acpi_setup_sb_notify_handler();
1428 acpi_viot_init();
1429 acpi_agdi_init();
1430 acpi_apmt_init();
1431 return 0;
1432}
1433
1434subsys_initcall(acpi_init);