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