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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/*
2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/kernel.h>
29#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
32#include <linux/device.h>
33#include <linux/proc_fs.h>
34#include <linux/acpi.h>
35#include <linux/slab.h>
36#include <linux/regulator/machine.h>
37#ifdef CONFIG_X86
38#include <asm/mpspec.h>
39#endif
40#include <linux/pci.h>
41#include <acpi/apei.h>
42#include <linux/dmi.h>
43#include <linux/suspend.h>
44
45#include "internal.h"
46
47#define _COMPONENT ACPI_BUS_COMPONENT
48ACPI_MODULE_NAME("bus");
49
50struct acpi_device *acpi_root;
51struct proc_dir_entry *acpi_root_dir;
52EXPORT_SYMBOL(acpi_root_dir);
53
54#ifdef CONFIG_X86
55static int set_copy_dsdt(const struct dmi_system_id *id)
56{
57 printk(KERN_NOTICE "%s detected - "
58 "force copy of DSDT to local memory\n", id->ident);
59 acpi_gbl_copy_dsdt_locally = 1;
60 return 0;
61}
62
63static struct dmi_system_id dsdt_dmi_table[] __initdata = {
64 /*
65 * Invoke DSDT corruption work-around on all Toshiba Satellite.
66 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
67 */
68 {
69 .callback = set_copy_dsdt,
70 .ident = "TOSHIBA Satellite",
71 .matches = {
72 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
73 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
74 },
75 },
76 {}
77};
78#else
79static struct dmi_system_id dsdt_dmi_table[] __initdata = {
80 {}
81};
82#endif
83
84/* --------------------------------------------------------------------------
85 Device Management
86 -------------------------------------------------------------------------- */
87
88acpi_status acpi_bus_get_status_handle(acpi_handle handle,
89 unsigned long long *sta)
90{
91 acpi_status status;
92
93 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
94 if (ACPI_SUCCESS(status))
95 return AE_OK;
96
97 if (status == AE_NOT_FOUND) {
98 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
99 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
100 return AE_OK;
101 }
102 return status;
103}
104
105int acpi_bus_get_status(struct acpi_device *device)
106{
107 acpi_status status;
108 unsigned long long sta;
109
110 status = acpi_bus_get_status_handle(device->handle, &sta);
111 if (ACPI_FAILURE(status))
112 return -ENODEV;
113
114 acpi_set_device_status(device, sta);
115
116 if (device->status.functional && !device->status.present) {
117 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
118 "functional but not present;\n",
119 device->pnp.bus_id, (u32)sta));
120 }
121
122 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
123 device->pnp.bus_id, (u32)sta));
124 return 0;
125}
126EXPORT_SYMBOL(acpi_bus_get_status);
127
128void acpi_bus_private_data_handler(acpi_handle handle,
129 void *context)
130{
131 return;
132}
133EXPORT_SYMBOL(acpi_bus_private_data_handler);
134
135int acpi_bus_get_private_data(acpi_handle handle, void **data)
136{
137 acpi_status status;
138
139 if (!*data)
140 return -EINVAL;
141
142 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
143 if (ACPI_FAILURE(status) || !*data) {
144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
145 handle));
146 return -ENODEV;
147 }
148
149 return 0;
150}
151EXPORT_SYMBOL(acpi_bus_get_private_data);
152
153void acpi_bus_no_hotplug(acpi_handle handle)
154{
155 struct acpi_device *adev = NULL;
156
157 acpi_bus_get_device(handle, &adev);
158 if (adev)
159 adev->flags.no_hotplug = true;
160}
161EXPORT_SYMBOL_GPL(acpi_bus_no_hotplug);
162
163static void acpi_print_osc_error(acpi_handle handle,
164 struct acpi_osc_context *context, char *error)
165{
166 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
167 int i;
168
169 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
170 printk(KERN_DEBUG "%s\n", error);
171 else {
172 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
173 kfree(buffer.pointer);
174 }
175 printk(KERN_DEBUG"_OSC request data:");
176 for (i = 0; i < context->cap.length; i += sizeof(u32))
177 printk("%x ", *((u32 *)(context->cap.pointer + i)));
178 printk("\n");
179}
180
181acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
182{
183 int i;
184 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
185 24, 26, 28, 30, 32, 34};
186
187 if (strlen(str) != 36)
188 return AE_BAD_PARAMETER;
189 for (i = 0; i < 36; i++) {
190 if (i == 8 || i == 13 || i == 18 || i == 23) {
191 if (str[i] != '-')
192 return AE_BAD_PARAMETER;
193 } else if (!isxdigit(str[i]))
194 return AE_BAD_PARAMETER;
195 }
196 for (i = 0; i < 16; i++) {
197 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
198 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
199 }
200 return AE_OK;
201}
202EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
203
204acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
205{
206 acpi_status status;
207 struct acpi_object_list input;
208 union acpi_object in_params[4];
209 union acpi_object *out_obj;
210 u8 uuid[16];
211 u32 errors;
212 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
213
214 if (!context)
215 return AE_ERROR;
216 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
217 return AE_ERROR;
218 context->ret.length = ACPI_ALLOCATE_BUFFER;
219 context->ret.pointer = NULL;
220
221 /* Setting up input parameters */
222 input.count = 4;
223 input.pointer = in_params;
224 in_params[0].type = ACPI_TYPE_BUFFER;
225 in_params[0].buffer.length = 16;
226 in_params[0].buffer.pointer = uuid;
227 in_params[1].type = ACPI_TYPE_INTEGER;
228 in_params[1].integer.value = context->rev;
229 in_params[2].type = ACPI_TYPE_INTEGER;
230 in_params[2].integer.value = context->cap.length/sizeof(u32);
231 in_params[3].type = ACPI_TYPE_BUFFER;
232 in_params[3].buffer.length = context->cap.length;
233 in_params[3].buffer.pointer = context->cap.pointer;
234
235 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
236 if (ACPI_FAILURE(status))
237 return status;
238
239 if (!output.length)
240 return AE_NULL_OBJECT;
241
242 out_obj = output.pointer;
243 if (out_obj->type != ACPI_TYPE_BUFFER
244 || out_obj->buffer.length != context->cap.length) {
245 acpi_print_osc_error(handle, context,
246 "_OSC evaluation returned wrong type");
247 status = AE_TYPE;
248 goto out_kfree;
249 }
250 /* Need to ignore the bit0 in result code */
251 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
252 if (errors) {
253 if (errors & OSC_REQUEST_ERROR)
254 acpi_print_osc_error(handle, context,
255 "_OSC request failed");
256 if (errors & OSC_INVALID_UUID_ERROR)
257 acpi_print_osc_error(handle, context,
258 "_OSC invalid UUID");
259 if (errors & OSC_INVALID_REVISION_ERROR)
260 acpi_print_osc_error(handle, context,
261 "_OSC invalid revision");
262 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
263 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
264 & OSC_QUERY_ENABLE)
265 goto out_success;
266 status = AE_SUPPORT;
267 goto out_kfree;
268 }
269 status = AE_ERROR;
270 goto out_kfree;
271 }
272out_success:
273 context->ret.length = out_obj->buffer.length;
274 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
275 context->ret.length, GFP_KERNEL);
276 if (!context->ret.pointer) {
277 status = AE_NO_MEMORY;
278 goto out_kfree;
279 }
280 status = AE_OK;
281
282out_kfree:
283 kfree(output.pointer);
284 if (status != AE_OK)
285 context->ret.pointer = NULL;
286 return status;
287}
288EXPORT_SYMBOL(acpi_run_osc);
289
290bool osc_sb_apei_support_acked;
291static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
292static void acpi_bus_osc_support(void)
293{
294 u32 capbuf[2];
295 struct acpi_osc_context context = {
296 .uuid_str = sb_uuid_str,
297 .rev = 1,
298 .cap.length = 8,
299 .cap.pointer = capbuf,
300 };
301 acpi_handle handle;
302
303 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
304 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
305#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
306 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
307 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
308#endif
309
310#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
311 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
312#endif
313
314 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
315
316 if (!ghes_disable)
317 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
318 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
319 return;
320 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
321 u32 *capbuf_ret = context.ret.pointer;
322 if (context.ret.length > OSC_SUPPORT_DWORD)
323 osc_sb_apei_support_acked =
324 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
325 kfree(context.ret.pointer);
326 }
327 /* do we need to check other returned cap? Sounds no */
328}
329
330/* --------------------------------------------------------------------------
331 Notification Handling
332 -------------------------------------------------------------------------- */
333
334/**
335 * acpi_bus_notify
336 * ---------------
337 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
338 */
339static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
340{
341 struct acpi_device *adev;
342 struct acpi_driver *driver;
343 acpi_status status;
344 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
345
346 switch (type) {
347 case ACPI_NOTIFY_BUS_CHECK:
348 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
349 break;
350
351 case ACPI_NOTIFY_DEVICE_CHECK:
352 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
353 break;
354
355 case ACPI_NOTIFY_DEVICE_WAKE:
356 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
357 break;
358
359 case ACPI_NOTIFY_EJECT_REQUEST:
360 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
361 break;
362
363 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
364 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
365 /* TBD: Exactly what does 'light' mean? */
366 break;
367
368 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
369 acpi_handle_err(handle, "Device cannot be configured due "
370 "to a frequency mismatch\n");
371 break;
372
373 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
374 acpi_handle_err(handle, "Device cannot be configured due "
375 "to a bus mode mismatch\n");
376 break;
377
378 case ACPI_NOTIFY_POWER_FAULT:
379 acpi_handle_err(handle, "Device has suffered a power fault\n");
380 break;
381
382 default:
383 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
384 break;
385 }
386
387 adev = acpi_bus_get_acpi_device(handle);
388 if (!adev)
389 goto err;
390
391 driver = adev->driver;
392 if (driver && driver->ops.notify &&
393 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
394 driver->ops.notify(adev, type);
395
396 switch (type) {
397 case ACPI_NOTIFY_BUS_CHECK:
398 case ACPI_NOTIFY_DEVICE_CHECK:
399 case ACPI_NOTIFY_EJECT_REQUEST:
400 status = acpi_hotplug_schedule(adev, type);
401 if (ACPI_SUCCESS(status))
402 return;
403 default:
404 break;
405 }
406 acpi_bus_put_acpi_device(adev);
407 return;
408
409 err:
410 acpi_evaluate_ost(handle, type, ost_code, NULL);
411}
412
413/* --------------------------------------------------------------------------
414 Initialization/Cleanup
415 -------------------------------------------------------------------------- */
416
417static int __init acpi_bus_init_irq(void)
418{
419 acpi_status status;
420 char *message = NULL;
421
422
423 /*
424 * Let the system know what interrupt model we are using by
425 * evaluating the \_PIC object, if exists.
426 */
427
428 switch (acpi_irq_model) {
429 case ACPI_IRQ_MODEL_PIC:
430 message = "PIC";
431 break;
432 case ACPI_IRQ_MODEL_IOAPIC:
433 message = "IOAPIC";
434 break;
435 case ACPI_IRQ_MODEL_IOSAPIC:
436 message = "IOSAPIC";
437 break;
438 case ACPI_IRQ_MODEL_PLATFORM:
439 message = "platform specific model";
440 break;
441 default:
442 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
443 return -ENODEV;
444 }
445
446 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
447
448 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
449 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
450 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
451 return -ENODEV;
452 }
453
454 return 0;
455}
456
457u8 acpi_gbl_permanent_mmap;
458
459
460void __init acpi_early_init(void)
461{
462 acpi_status status;
463
464 if (acpi_disabled)
465 return;
466
467 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
468
469 /* enable workarounds, unless strict ACPI spec. compliance */
470 if (!acpi_strict)
471 acpi_gbl_enable_interpreter_slack = TRUE;
472
473 acpi_gbl_permanent_mmap = 1;
474
475 /*
476 * If the machine falls into the DMI check table,
477 * DSDT will be copied to memory
478 */
479 dmi_check_system(dsdt_dmi_table);
480
481 status = acpi_reallocate_root_table();
482 if (ACPI_FAILURE(status)) {
483 printk(KERN_ERR PREFIX
484 "Unable to reallocate ACPI tables\n");
485 goto error0;
486 }
487
488 status = acpi_initialize_subsystem();
489 if (ACPI_FAILURE(status)) {
490 printk(KERN_ERR PREFIX
491 "Unable to initialize the ACPI Interpreter\n");
492 goto error0;
493 }
494
495 status = acpi_load_tables();
496 if (ACPI_FAILURE(status)) {
497 printk(KERN_ERR PREFIX
498 "Unable to load the System Description Tables\n");
499 goto error0;
500 }
501
502#ifdef CONFIG_X86
503 if (!acpi_ioapic) {
504 /* compatible (0) means level (3) */
505 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
506 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
507 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
508 }
509 /* Set PIC-mode SCI trigger type */
510 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
511 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
512 } else {
513 /*
514 * now that acpi_gbl_FADT is initialized,
515 * update it with result from INT_SRC_OVR parsing
516 */
517 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
518 }
519#endif
520
521 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
522 if (ACPI_FAILURE(status)) {
523 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
524 goto error0;
525 }
526
527 /*
528 * If the system is using ACPI then we can be reasonably
529 * confident that any regulators are managed by the firmware
530 * so tell the regulator core it has everything it needs to
531 * know.
532 */
533 regulator_has_full_constraints();
534
535 return;
536
537 error0:
538 disable_acpi();
539 return;
540}
541
542static int __init acpi_bus_init(void)
543{
544 int result;
545 acpi_status status;
546
547 acpi_os_initialize1();
548
549 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
550 if (ACPI_FAILURE(status)) {
551 printk(KERN_ERR PREFIX
552 "Unable to start the ACPI Interpreter\n");
553 goto error1;
554 }
555
556 /*
557 * ACPI 2.0 requires the EC driver to be loaded and work before
558 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
559 * is called).
560 *
561 * This is accomplished by looking for the ECDT table, and getting
562 * the EC parameters out of that.
563 */
564 status = acpi_ec_ecdt_probe();
565 /* Ignore result. Not having an ECDT is not fatal. */
566
567 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
568 if (ACPI_FAILURE(status)) {
569 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
570 goto error1;
571 }
572
573 /*
574 * _OSC method may exist in module level code,
575 * so it must be run after ACPI_FULL_INITIALIZATION
576 */
577 acpi_bus_osc_support();
578
579 /*
580 * _PDC control method may load dynamic SSDT tables,
581 * and we need to install the table handler before that.
582 */
583 acpi_sysfs_init();
584
585 acpi_early_processor_set_pdc();
586
587 /*
588 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
589 * is necessary to enable it as early as possible.
590 */
591 acpi_boot_ec_enable();
592
593 printk(KERN_INFO PREFIX "Interpreter enabled\n");
594
595 /* Initialize sleep structures */
596 acpi_sleep_init();
597
598 /*
599 * Get the system interrupt model and evaluate \_PIC.
600 */
601 result = acpi_bus_init_irq();
602 if (result)
603 goto error1;
604
605 /*
606 * Register the for all standard device notifications.
607 */
608 status =
609 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
610 &acpi_bus_notify, NULL);
611 if (ACPI_FAILURE(status)) {
612 printk(KERN_ERR PREFIX
613 "Unable to register for device notifications\n");
614 goto error1;
615 }
616
617 /*
618 * Create the top ACPI proc directory
619 */
620 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
621
622 return 0;
623
624 /* Mimic structured exception handling */
625 error1:
626 acpi_terminate();
627 return -ENODEV;
628}
629
630struct kobject *acpi_kobj;
631EXPORT_SYMBOL_GPL(acpi_kobj);
632
633static int __init acpi_init(void)
634{
635 int result;
636
637 if (acpi_disabled) {
638 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
639 return -ENODEV;
640 }
641
642 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
643 if (!acpi_kobj) {
644 printk(KERN_WARNING "%s: kset create error\n", __func__);
645 acpi_kobj = NULL;
646 }
647
648 init_acpi_device_notify();
649 result = acpi_bus_init();
650 if (result) {
651 disable_acpi();
652 return result;
653 }
654
655 pci_mmcfg_late_init();
656 acpi_scan_init();
657 acpi_ec_init();
658 acpi_debugfs_init();
659 acpi_sleep_proc_init();
660 acpi_wakeup_device_init();
661 return 0;
662}
663
664subsys_initcall(acpi_init);