xref: /linux/drivers/acpi/bus.c (revision 2363088eba2ecccfb643725e4864af73c4226a04)
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 
37 struct acpi_device *acpi_root;
38 struct proc_dir_entry *acpi_root_dir;
39 EXPORT_SYMBOL(acpi_root_dir);
40 
41 #ifdef CONFIG_X86
42 #ifdef CONFIG_ACPI_CUSTOM_DSDT
43 static inline int set_copy_dsdt(const struct dmi_system_id *id)
44 {
45 	return 0;
46 }
47 #else
48 static 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 
56 static 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 
77 acpi_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 }
93 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
94 
95 int 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 }
125 EXPORT_SYMBOL(acpi_bus_get_status);
126 
127 void acpi_bus_private_data_handler(acpi_handle handle,
128 				   void *context)
129 {
130 	return;
131 }
132 EXPORT_SYMBOL(acpi_bus_private_data_handler);
133 
134 int 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 }
147 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
148 
149 int 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 }
164 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
165 
166 void acpi_bus_detach_private_data(acpi_handle handle)
167 {
168 	acpi_detach_data(handle, acpi_bus_private_data_handler);
169 }
170 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
171 
172 static 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 
186 acpi_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 	}
254 out_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 
264 out_kfree:
265 	kfree(output.pointer);
266 	return status;
267 }
268 EXPORT_SYMBOL(acpi_run_osc);
269 
270 bool 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  */
276 bool osc_pc_lpi_support_confirmed;
277 EXPORT_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  */
290 bool osc_cpc_flexible_adr_space_confirmed;
291 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
292 
293 /*
294  * ACPI 6.4 Operating System Capabilities for USB.
295  */
296 bool osc_sb_native_usb4_support_confirmed;
297 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
298 
299 bool osc_sb_cppc2_support_acked;
300 
301 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
302 static 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  */
396 u32 osc_sb_native_usb4_control;
397 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
398 
399 static 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 
408 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
409 static void acpi_bus_osc_negotiate_usb_control(void)
410 {
411 	u32 capbuf[3];
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 	capbuf[OSC_QUERY_DWORD] = 0;
432 	capbuf[OSC_SUPPORT_DWORD] = 0;
433 	capbuf[OSC_CONTROL_DWORD] = control;
434 
435 	status = acpi_run_osc(handle, &context);
436 	if (ACPI_FAILURE(status))
437 		return;
438 
439 	if (context.ret.length != sizeof(capbuf)) {
440 		pr_info("USB4 _OSC: returned invalid length buffer\n");
441 		goto out_free;
442 	}
443 
444 	osc_sb_native_usb4_control =
445 		control &  acpi_osc_ctx_get_pci_control(&context);
446 
447 	acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
448 	acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
449 				osc_sb_native_usb4_control);
450 
451 out_free:
452 	kfree(context.ret.pointer);
453 }
454 
455 /* --------------------------------------------------------------------------
456                              Notification Handling
457    -------------------------------------------------------------------------- */
458 
459 /**
460  * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
461  * @handle: Target ACPI object.
462  * @type: Notification type.
463  * @data: Ignored.
464  *
465  * This only handles notifications related to device hotplug.
466  */
467 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
468 {
469 	struct acpi_device *adev;
470 
471 	switch (type) {
472 	case ACPI_NOTIFY_BUS_CHECK:
473 		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
474 		break;
475 
476 	case ACPI_NOTIFY_DEVICE_CHECK:
477 		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
478 		break;
479 
480 	case ACPI_NOTIFY_DEVICE_WAKE:
481 		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
482 		return;
483 
484 	case ACPI_NOTIFY_EJECT_REQUEST:
485 		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
486 		break;
487 
488 	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
489 		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
490 		/* TBD: Exactly what does 'light' mean? */
491 		return;
492 
493 	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
494 		acpi_handle_err(handle, "Device cannot be configured due "
495 				"to a frequency mismatch\n");
496 		return;
497 
498 	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
499 		acpi_handle_err(handle, "Device cannot be configured due "
500 				"to a bus mode mismatch\n");
501 		return;
502 
503 	case ACPI_NOTIFY_POWER_FAULT:
504 		acpi_handle_err(handle, "Device has suffered a power fault\n");
505 		return;
506 
507 	default:
508 		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
509 		return;
510 	}
511 
512 	adev = acpi_get_acpi_dev(handle);
513 
514 	if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
515 		return;
516 
517 	acpi_put_acpi_dev(adev);
518 
519 	acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
520 }
521 
522 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
523 {
524 	struct acpi_device *device = data;
525 	struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
526 
527 	acpi_drv->ops.notify(device, event);
528 }
529 
530 static int acpi_device_install_notify_handler(struct acpi_device *device,
531 					      struct acpi_driver *acpi_drv)
532 {
533 	u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
534 				ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
535 	acpi_status status;
536 
537 	status = acpi_install_notify_handler(device->handle, type,
538 					     acpi_notify_device, device);
539 	if (ACPI_FAILURE(status))
540 		return -EINVAL;
541 
542 	return 0;
543 }
544 
545 static void acpi_device_remove_notify_handler(struct acpi_device *device,
546 					      struct acpi_driver *acpi_drv)
547 {
548 	u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
549 				ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
550 
551 	acpi_remove_notify_handler(device->handle, type,
552 				   acpi_notify_device);
553 
554 	acpi_os_wait_events_complete();
555 }
556 
557 /* Handle events targeting \_SB device (at present only graceful shutdown) */
558 
559 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
560 #define ACPI_SB_INDICATE_INTERVAL	10000
561 
562 static void sb_notify_work(struct work_struct *dummy)
563 {
564 	acpi_handle sb_handle;
565 
566 	orderly_poweroff(true);
567 
568 	/*
569 	 * After initiating graceful shutdown, the ACPI spec requires OSPM
570 	 * to evaluate _OST method once every 10seconds to indicate that
571 	 * the shutdown is in progress
572 	 */
573 	acpi_get_handle(NULL, "\\_SB", &sb_handle);
574 	while (1) {
575 		pr_info("Graceful shutdown in progress.\n");
576 		acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
577 				ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
578 		msleep(ACPI_SB_INDICATE_INTERVAL);
579 	}
580 }
581 
582 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
583 {
584 	static DECLARE_WORK(acpi_sb_work, sb_notify_work);
585 
586 	if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
587 		if (!work_busy(&acpi_sb_work))
588 			schedule_work(&acpi_sb_work);
589 	} else {
590 		pr_warn("event %x is not supported by \\_SB device\n", event);
591 	}
592 }
593 
594 static int __init acpi_setup_sb_notify_handler(void)
595 {
596 	acpi_handle sb_handle;
597 
598 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
599 		return -ENXIO;
600 
601 	if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
602 						acpi_sb_notify, NULL)))
603 		return -EINVAL;
604 
605 	return 0;
606 }
607 
608 /* --------------------------------------------------------------------------
609                              Device Matching
610    -------------------------------------------------------------------------- */
611 
612 /**
613  * acpi_get_first_physical_node - Get first physical node of an ACPI device
614  * @adev:	ACPI device in question
615  *
616  * Return: First physical node of ACPI device @adev
617  */
618 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
619 {
620 	struct mutex *physical_node_lock = &adev->physical_node_lock;
621 	struct device *phys_dev;
622 
623 	mutex_lock(physical_node_lock);
624 	if (list_empty(&adev->physical_node_list)) {
625 		phys_dev = NULL;
626 	} else {
627 		const struct acpi_device_physical_node *node;
628 
629 		node = list_first_entry(&adev->physical_node_list,
630 					struct acpi_device_physical_node, node);
631 
632 		phys_dev = node->dev;
633 	}
634 	mutex_unlock(physical_node_lock);
635 	return phys_dev;
636 }
637 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
638 
639 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
640 						      const struct device *dev)
641 {
642 	const struct device *phys_dev = acpi_get_first_physical_node(adev);
643 
644 	return phys_dev && phys_dev == dev ? adev : NULL;
645 }
646 
647 /**
648  * acpi_device_is_first_physical_node - Is given dev first physical node
649  * @adev: ACPI companion device
650  * @dev: Physical device to check
651  *
652  * Function checks if given @dev is the first physical devices attached to
653  * the ACPI companion device. This distinction is needed in some cases
654  * where the same companion device is shared between many physical devices.
655  *
656  * Note that the caller have to provide valid @adev pointer.
657  */
658 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
659 					const struct device *dev)
660 {
661 	return !!acpi_primary_dev_companion(adev, dev);
662 }
663 
664 /*
665  * acpi_companion_match() - Can we match via ACPI companion device
666  * @dev: Device in question
667  *
668  * Check if the given device has an ACPI companion and if that companion has
669  * a valid list of PNP IDs, and if the device is the first (primary) physical
670  * device associated with it.  Return the companion pointer if that's the case
671  * or NULL otherwise.
672  *
673  * If multiple physical devices are attached to a single ACPI companion, we need
674  * to be careful.  The usage scenario for this kind of relationship is that all
675  * of the physical devices in question use resources provided by the ACPI
676  * companion.  A typical case is an MFD device where all the sub-devices share
677  * the parent's ACPI companion.  In such cases we can only allow the primary
678  * (first) physical device to be matched with the help of the companion's PNP
679  * IDs.
680  *
681  * Additional physical devices sharing the ACPI companion can still use
682  * resources available from it but they will be matched normally using functions
683  * provided by their bus types (and analogously for their modalias).
684  */
685 const struct acpi_device *acpi_companion_match(const struct device *dev)
686 {
687 	struct acpi_device *adev;
688 
689 	adev = ACPI_COMPANION(dev);
690 	if (!adev)
691 		return NULL;
692 
693 	if (list_empty(&adev->pnp.ids))
694 		return NULL;
695 
696 	return acpi_primary_dev_companion(adev, dev);
697 }
698 
699 /**
700  * acpi_of_match_device - Match device object using the "compatible" property.
701  * @adev: ACPI device object to match.
702  * @of_match_table: List of device IDs to match against.
703  * @of_id: OF ID if matched
704  *
705  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
706  * identifiers and a _DSD object with the "compatible" property, use that
707  * property to match against the given list of identifiers.
708  */
709 static bool acpi_of_match_device(const struct acpi_device *adev,
710 				 const struct of_device_id *of_match_table,
711 				 const struct of_device_id **of_id)
712 {
713 	const union acpi_object *of_compatible, *obj;
714 	int i, nval;
715 
716 	if (!adev)
717 		return false;
718 
719 	of_compatible = adev->data.of_compatible;
720 	if (!of_match_table || !of_compatible)
721 		return false;
722 
723 	if (of_compatible->type == ACPI_TYPE_PACKAGE) {
724 		nval = of_compatible->package.count;
725 		obj = of_compatible->package.elements;
726 	} else { /* Must be ACPI_TYPE_STRING. */
727 		nval = 1;
728 		obj = of_compatible;
729 	}
730 	/* Now we can look for the driver DT compatible strings */
731 	for (i = 0; i < nval; i++, obj++) {
732 		const struct of_device_id *id;
733 
734 		for (id = of_match_table; id->compatible[0]; id++)
735 			if (!strcasecmp(obj->string.pointer, id->compatible)) {
736 				if (of_id)
737 					*of_id = id;
738 				return true;
739 			}
740 	}
741 
742 	return false;
743 }
744 
745 static bool acpi_of_modalias(struct acpi_device *adev,
746 			     char *modalias, size_t len)
747 {
748 	const union acpi_object *of_compatible;
749 	const union acpi_object *obj;
750 	const char *str, *chr;
751 
752 	of_compatible = adev->data.of_compatible;
753 	if (!of_compatible)
754 		return false;
755 
756 	if (of_compatible->type == ACPI_TYPE_PACKAGE)
757 		obj = of_compatible->package.elements;
758 	else /* Must be ACPI_TYPE_STRING. */
759 		obj = of_compatible;
760 
761 	str = obj->string.pointer;
762 	chr = strchr(str, ',');
763 	strscpy(modalias, chr ? chr + 1 : str, len);
764 
765 	return true;
766 }
767 
768 /**
769  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
770  * @adev:	ACPI device object to match
771  * @default_id:	ID string to use as default if no compatible string found
772  * @modalias:   Pointer to buffer that modalias value will be copied into
773  * @len:	Length of modalias buffer
774  *
775  * This is a counterpart of of_alias_from_compatible() for struct acpi_device
776  * objects. If there is a compatible string for @adev, it will be copied to
777  * @modalias with the vendor prefix stripped; otherwise, @default_id will be
778  * used.
779  */
780 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
781 		       char *modalias, size_t len)
782 {
783 	if (!acpi_of_modalias(adev, modalias, len))
784 		strscpy(modalias, default_id, len);
785 }
786 EXPORT_SYMBOL_GPL(acpi_set_modalias);
787 
788 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
789 				    struct acpi_hardware_id *hwid)
790 {
791 	int i, msk, byte_shift;
792 	char buf[3];
793 
794 	if (!id->cls)
795 		return false;
796 
797 	/* Apply class-code bitmask, before checking each class-code byte */
798 	for (i = 1; i <= 3; i++) {
799 		byte_shift = 8 * (3 - i);
800 		msk = (id->cls_msk >> byte_shift) & 0xFF;
801 		if (!msk)
802 			continue;
803 
804 		sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
805 		if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
806 			return false;
807 	}
808 	return true;
809 }
810 
811 static bool __acpi_match_device(const struct acpi_device *device,
812 				const struct acpi_device_id *acpi_ids,
813 				const struct of_device_id *of_ids,
814 				const struct acpi_device_id **acpi_id,
815 				const struct of_device_id **of_id)
816 {
817 	const struct acpi_device_id *id;
818 	struct acpi_hardware_id *hwid;
819 
820 	/*
821 	 * If the device is not present, it is unnecessary to load device
822 	 * driver for it.
823 	 */
824 	if (!device || !device->status.present)
825 		return false;
826 
827 	list_for_each_entry(hwid, &device->pnp.ids, list) {
828 		/* First, check the ACPI/PNP IDs provided by the caller. */
829 		if (acpi_ids) {
830 			for (id = acpi_ids; id->id[0] || id->cls; id++) {
831 				if (id->id[0] && !strcmp((char *)id->id, hwid->id))
832 					goto out_acpi_match;
833 				if (id->cls && __acpi_match_device_cls(id, hwid))
834 					goto out_acpi_match;
835 			}
836 		}
837 
838 		/*
839 		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
840 		 * "compatible" property if found.
841 		 */
842 		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
843 			return acpi_of_match_device(device, of_ids, of_id);
844 	}
845 	return false;
846 
847 out_acpi_match:
848 	if (acpi_id)
849 		*acpi_id = id;
850 	return true;
851 }
852 
853 /**
854  * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
855  * @ids: Array of struct acpi_device_id objects to match against.
856  * @adev: The ACPI device pointer to match.
857  *
858  * Match the ACPI device @adev against a given list of ACPI IDs @ids.
859  *
860  * Return:
861  * a pointer to the first matching ACPI ID on success or %NULL on failure.
862  */
863 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
864 						    const struct acpi_device *adev)
865 {
866 	const struct acpi_device_id *id = NULL;
867 
868 	__acpi_match_device(adev, ids, NULL, &id, NULL);
869 	return id;
870 }
871 EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
872 
873 /**
874  * acpi_match_device - Match a struct device against a given list of ACPI IDs
875  * @ids: Array of struct acpi_device_id object to match against.
876  * @dev: The device structure to match.
877  *
878  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
879  * object for that handle and use that object to match against a given list of
880  * device IDs.
881  *
882  * Return a pointer to the first matching ID on success or %NULL on failure.
883  */
884 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
885 					       const struct device *dev)
886 {
887 	return acpi_match_acpi_device(ids, acpi_companion_match(dev));
888 }
889 EXPORT_SYMBOL_GPL(acpi_match_device);
890 
891 static const void *acpi_of_device_get_match_data(const struct device *dev)
892 {
893 	struct acpi_device *adev = ACPI_COMPANION(dev);
894 	const struct of_device_id *match = NULL;
895 
896 	if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
897 		return NULL;
898 
899 	return match->data;
900 }
901 
902 const void *acpi_device_get_match_data(const struct device *dev)
903 {
904 	const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
905 	const struct acpi_device_id *match;
906 
907 	if (!acpi_ids)
908 		return acpi_of_device_get_match_data(dev);
909 
910 	match = acpi_match_device(acpi_ids, dev);
911 	if (!match)
912 		return NULL;
913 
914 	return (const void *)match->driver_data;
915 }
916 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
917 
918 int acpi_match_device_ids(struct acpi_device *device,
919 			  const struct acpi_device_id *ids)
920 {
921 	return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
922 }
923 EXPORT_SYMBOL(acpi_match_device_ids);
924 
925 bool acpi_driver_match_device(struct device *dev,
926 			      const struct device_driver *drv)
927 {
928 	const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
929 	const struct of_device_id *of_ids = drv->of_match_table;
930 
931 	if (!acpi_ids)
932 		return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
933 
934 	return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
935 }
936 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
937 
938 /* --------------------------------------------------------------------------
939                               ACPI Driver Management
940    -------------------------------------------------------------------------- */
941 
942 /**
943  * acpi_bus_register_driver - register a driver with the ACPI bus
944  * @driver: driver being registered
945  *
946  * Registers a driver with the ACPI bus.  Searches the namespace for all
947  * devices that match the driver's criteria and binds.  Returns zero for
948  * success or a negative error status for failure.
949  */
950 int acpi_bus_register_driver(struct acpi_driver *driver)
951 {
952 	if (acpi_disabled)
953 		return -ENODEV;
954 	driver->drv.name = driver->name;
955 	driver->drv.bus = &acpi_bus_type;
956 	driver->drv.owner = driver->owner;
957 
958 	return driver_register(&driver->drv);
959 }
960 
961 EXPORT_SYMBOL(acpi_bus_register_driver);
962 
963 /**
964  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
965  * @driver: driver to unregister
966  *
967  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
968  * devices that match the driver's criteria and unbinds.
969  */
970 void acpi_bus_unregister_driver(struct acpi_driver *driver)
971 {
972 	driver_unregister(&driver->drv);
973 }
974 
975 EXPORT_SYMBOL(acpi_bus_unregister_driver);
976 
977 /* --------------------------------------------------------------------------
978                               ACPI Bus operations
979    -------------------------------------------------------------------------- */
980 
981 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
982 {
983 	struct acpi_device *acpi_dev = to_acpi_device(dev);
984 	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
985 
986 	return acpi_dev->flags.match_driver
987 		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
988 }
989 
990 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
991 {
992 	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
993 }
994 
995 static int acpi_device_probe(struct device *dev)
996 {
997 	struct acpi_device *acpi_dev = to_acpi_device(dev);
998 	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
999 	int ret;
1000 
1001 	if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1002 		return -EINVAL;
1003 
1004 	if (!acpi_drv->ops.add)
1005 		return -ENOSYS;
1006 
1007 	ret = acpi_drv->ops.add(acpi_dev);
1008 	if (ret)
1009 		return ret;
1010 
1011 	pr_debug("Driver [%s] successfully bound to device [%s]\n",
1012 		 acpi_drv->name, acpi_dev->pnp.bus_id);
1013 
1014 	if (acpi_drv->ops.notify) {
1015 		ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1016 		if (ret) {
1017 			if (acpi_drv->ops.remove)
1018 				acpi_drv->ops.remove(acpi_dev);
1019 
1020 			acpi_dev->driver_data = NULL;
1021 			return ret;
1022 		}
1023 	}
1024 
1025 	pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1026 		 acpi_dev->pnp.bus_id);
1027 
1028 	get_device(dev);
1029 	return 0;
1030 }
1031 
1032 static void acpi_device_remove(struct device *dev)
1033 {
1034 	struct acpi_device *acpi_dev = to_acpi_device(dev);
1035 	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1036 
1037 	if (acpi_drv->ops.notify)
1038 		acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1039 
1040 	if (acpi_drv->ops.remove)
1041 		acpi_drv->ops.remove(acpi_dev);
1042 
1043 	acpi_dev->driver_data = NULL;
1044 
1045 	put_device(dev);
1046 }
1047 
1048 struct bus_type acpi_bus_type = {
1049 	.name		= "acpi",
1050 	.match		= acpi_bus_match,
1051 	.probe		= acpi_device_probe,
1052 	.remove		= acpi_device_remove,
1053 	.uevent		= acpi_device_uevent,
1054 };
1055 
1056 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1057 {
1058 	return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1059 }
1060 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1061 
1062 struct acpi_dev_walk_context {
1063 	int (*fn)(struct acpi_device *, void *);
1064 	void *data;
1065 };
1066 
1067 static int acpi_dev_for_one_check(struct device *dev, void *context)
1068 {
1069 	struct acpi_dev_walk_context *adwc = context;
1070 
1071 	if (dev->bus != &acpi_bus_type)
1072 		return 0;
1073 
1074 	return adwc->fn(to_acpi_device(dev), adwc->data);
1075 }
1076 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1077 
1078 int acpi_dev_for_each_child(struct acpi_device *adev,
1079 			    int (*fn)(struct acpi_device *, void *), void *data)
1080 {
1081 	struct acpi_dev_walk_context adwc = {
1082 		.fn = fn,
1083 		.data = data,
1084 	};
1085 
1086 	return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1087 }
1088 
1089 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1090 				    int (*fn)(struct acpi_device *, void *),
1091 				    void *data)
1092 {
1093 	struct acpi_dev_walk_context adwc = {
1094 		.fn = fn,
1095 		.data = data,
1096 	};
1097 
1098 	return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1099 }
1100 
1101 /* --------------------------------------------------------------------------
1102                              Initialization/Cleanup
1103    -------------------------------------------------------------------------- */
1104 
1105 static int __init acpi_bus_init_irq(void)
1106 {
1107 	acpi_status status;
1108 	char *message = NULL;
1109 
1110 
1111 	/*
1112 	 * Let the system know what interrupt model we are using by
1113 	 * evaluating the \_PIC object, if exists.
1114 	 */
1115 
1116 	switch (acpi_irq_model) {
1117 	case ACPI_IRQ_MODEL_PIC:
1118 		message = "PIC";
1119 		break;
1120 	case ACPI_IRQ_MODEL_IOAPIC:
1121 		message = "IOAPIC";
1122 		break;
1123 	case ACPI_IRQ_MODEL_IOSAPIC:
1124 		message = "IOSAPIC";
1125 		break;
1126 	case ACPI_IRQ_MODEL_GIC:
1127 		message = "GIC";
1128 		break;
1129 	case ACPI_IRQ_MODEL_PLATFORM:
1130 		message = "platform specific model";
1131 		break;
1132 	case ACPI_IRQ_MODEL_LPIC:
1133 		message = "LPIC";
1134 		break;
1135 	default:
1136 		pr_info("Unknown interrupt routing model\n");
1137 		return -ENODEV;
1138 	}
1139 
1140 	pr_info("Using %s for interrupt routing\n", message);
1141 
1142 	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1143 	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1144 		pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1145 		return -ENODEV;
1146 	}
1147 
1148 	return 0;
1149 }
1150 
1151 /**
1152  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1153  *
1154  * The ACPI tables are accessible after this, but the handling of events has not
1155  * been initialized and the global lock is not available yet, so AML should not
1156  * be executed at this point.
1157  *
1158  * Doing this before switching the EFI runtime services to virtual mode allows
1159  * the EfiBootServices memory to be freed slightly earlier on boot.
1160  */
1161 void __init acpi_early_init(void)
1162 {
1163 	acpi_status status;
1164 
1165 	if (acpi_disabled)
1166 		return;
1167 
1168 	pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1169 
1170 	/* enable workarounds, unless strict ACPI spec. compliance */
1171 	if (!acpi_strict)
1172 		acpi_gbl_enable_interpreter_slack = TRUE;
1173 
1174 	acpi_permanent_mmap = true;
1175 
1176 #ifdef CONFIG_X86
1177 	/*
1178 	 * If the machine falls into the DMI check table,
1179 	 * DSDT will be copied to memory.
1180 	 * Note that calling dmi_check_system() here on other architectures
1181 	 * would not be OK because only x86 initializes dmi early enough.
1182 	 * Thankfully only x86 systems need such quirks for now.
1183 	 */
1184 	dmi_check_system(dsdt_dmi_table);
1185 #endif
1186 
1187 	status = acpi_reallocate_root_table();
1188 	if (ACPI_FAILURE(status)) {
1189 		pr_err("Unable to reallocate ACPI tables\n");
1190 		goto error0;
1191 	}
1192 
1193 	status = acpi_initialize_subsystem();
1194 	if (ACPI_FAILURE(status)) {
1195 		pr_err("Unable to initialize the ACPI Interpreter\n");
1196 		goto error0;
1197 	}
1198 
1199 #ifdef CONFIG_X86
1200 	if (!acpi_ioapic) {
1201 		/* compatible (0) means level (3) */
1202 		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1203 			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1204 			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1205 		}
1206 		/* Set PIC-mode SCI trigger type */
1207 		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1208 					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1209 	} else {
1210 		/*
1211 		 * now that acpi_gbl_FADT is initialized,
1212 		 * update it with result from INT_SRC_OVR parsing
1213 		 */
1214 		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1215 	}
1216 #endif
1217 	return;
1218 
1219  error0:
1220 	disable_acpi();
1221 }
1222 
1223 /**
1224  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1225  *
1226  * Switch over the platform to the ACPI mode (if possible).
1227  *
1228  * Doing this too early is generally unsafe, but at the same time it needs to be
1229  * done before all things that really depend on ACPI.  The right spot appears to
1230  * be before finalizing the EFI initialization.
1231  */
1232 void __init acpi_subsystem_init(void)
1233 {
1234 	acpi_status status;
1235 
1236 	if (acpi_disabled)
1237 		return;
1238 
1239 	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1240 	if (ACPI_FAILURE(status)) {
1241 		pr_err("Unable to enable ACPI\n");
1242 		disable_acpi();
1243 	} else {
1244 		/*
1245 		 * If the system is using ACPI then we can be reasonably
1246 		 * confident that any regulators are managed by the firmware
1247 		 * so tell the regulator core it has everything it needs to
1248 		 * know.
1249 		 */
1250 		regulator_has_full_constraints();
1251 	}
1252 }
1253 
1254 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1255 {
1256 	if (event == ACPI_TABLE_EVENT_LOAD)
1257 		acpi_scan_table_notify();
1258 
1259 	return acpi_sysfs_table_handler(event, table, context);
1260 }
1261 
1262 static int __init acpi_bus_init(void)
1263 {
1264 	int result;
1265 	acpi_status status;
1266 
1267 	acpi_os_initialize1();
1268 
1269 	status = acpi_load_tables();
1270 	if (ACPI_FAILURE(status)) {
1271 		pr_err("Unable to load the System Description Tables\n");
1272 		goto error1;
1273 	}
1274 
1275 	/*
1276 	 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1277 	 * device is found in the namespace.
1278 	 *
1279 	 * This is accomplished by looking for the ECDT table and getting the EC
1280 	 * parameters out of that.
1281 	 *
1282 	 * Do that before calling acpi_initialize_objects() which may trigger EC
1283 	 * address space accesses.
1284 	 */
1285 	acpi_ec_ecdt_probe();
1286 
1287 	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1288 	if (ACPI_FAILURE(status)) {
1289 		pr_err("Unable to start the ACPI Interpreter\n");
1290 		goto error1;
1291 	}
1292 
1293 	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1294 	if (ACPI_FAILURE(status)) {
1295 		pr_err("Unable to initialize ACPI objects\n");
1296 		goto error1;
1297 	}
1298 
1299 	/* Set capability bits for _OSC under processor scope */
1300 	acpi_early_processor_osc();
1301 
1302 	/*
1303 	 * _OSC method may exist in module level code,
1304 	 * so it must be run after ACPI_FULL_INITIALIZATION
1305 	 */
1306 	acpi_bus_osc_negotiate_platform_control();
1307 	acpi_bus_osc_negotiate_usb_control();
1308 
1309 	/*
1310 	 * _PDC control method may load dynamic SSDT tables,
1311 	 * and we need to install the table handler before that.
1312 	 */
1313 	status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1314 
1315 	acpi_sysfs_init();
1316 
1317 	acpi_early_processor_set_pdc();
1318 
1319 	/*
1320 	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1321 	 * is necessary to enable it as early as possible.
1322 	 */
1323 	acpi_ec_dsdt_probe();
1324 
1325 	pr_info("Interpreter enabled\n");
1326 
1327 	/* Initialize sleep structures */
1328 	acpi_sleep_init();
1329 
1330 	/*
1331 	 * Get the system interrupt model and evaluate \_PIC.
1332 	 */
1333 	result = acpi_bus_init_irq();
1334 	if (result)
1335 		goto error1;
1336 
1337 	/*
1338 	 * Register the for all standard device notifications.
1339 	 */
1340 	status =
1341 	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1342 					&acpi_bus_notify, NULL);
1343 	if (ACPI_FAILURE(status)) {
1344 		pr_err("Unable to register for system notifications\n");
1345 		goto error1;
1346 	}
1347 
1348 	/*
1349 	 * Create the top ACPI proc directory
1350 	 */
1351 	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1352 
1353 	result = bus_register(&acpi_bus_type);
1354 	if (!result)
1355 		return 0;
1356 
1357 	/* Mimic structured exception handling */
1358       error1:
1359 	acpi_terminate();
1360 	return -ENODEV;
1361 }
1362 
1363 struct kobject *acpi_kobj;
1364 EXPORT_SYMBOL_GPL(acpi_kobj);
1365 
1366 static int __init acpi_init(void)
1367 {
1368 	int result;
1369 
1370 	if (acpi_disabled) {
1371 		pr_info("Interpreter disabled.\n");
1372 		return -ENODEV;
1373 	}
1374 
1375 	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1376 	if (!acpi_kobj)
1377 		pr_debug("%s: kset create error\n", __func__);
1378 
1379 	init_prmt();
1380 	acpi_init_pcc();
1381 	result = acpi_bus_init();
1382 	if (result) {
1383 		kobject_put(acpi_kobj);
1384 		disable_acpi();
1385 		return result;
1386 	}
1387 	acpi_init_ffh();
1388 
1389 	pci_mmcfg_late_init();
1390 	acpi_arm_init();
1391 	acpi_viot_early_init();
1392 	acpi_hest_init();
1393 	acpi_ghes_init();
1394 	acpi_scan_init();
1395 	acpi_ec_init();
1396 	acpi_debugfs_init();
1397 	acpi_sleep_proc_init();
1398 	acpi_wakeup_device_init();
1399 	acpi_debugger_init();
1400 	acpi_setup_sb_notify_handler();
1401 	acpi_viot_init();
1402 	return 0;
1403 }
1404 
1405 subsys_initcall(acpi_init);
1406