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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel.h>
25 #include <linux/list.h>
26 #include <linux/sched.h>
27 #include <linux/pm.h>
28 #include <linux/device.h>
29 #include <linux/proc_fs.h>
30 #include <linux/acpi.h>
31 #include <linux/slab.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/workqueue.h>
34 #include <linux/reboot.h>
35 #include <linux/delay.h>
36 #ifdef CONFIG_X86
37 #include <asm/mpspec.h>
38 #endif
39 #include <linux/acpi_iort.h>
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
48 ACPI_MODULE_NAME("bus");
49
50 struct acpi_device *acpi_root;
51 struct proc_dir_entry *acpi_root_dir;
52 EXPORT_SYMBOL(acpi_root_dir);
53
54 #ifdef CONFIG_X86
55 #ifdef CONFIG_ACPI_CUSTOM_DSDT
set_copy_dsdt(const struct dmi_system_id * id)56 static inline int set_copy_dsdt(const struct dmi_system_id *id)
57 {
58 return 0;
59 }
60 #else
set_copy_dsdt(const struct dmi_system_id * id)61 static int set_copy_dsdt(const struct dmi_system_id *id)
62 {
63 printk(KERN_NOTICE "%s detected - "
64 "force copy of DSDT to local memory\n", id->ident);
65 acpi_gbl_copy_dsdt_locally = 1;
66 return 0;
67 }
68 #endif
69
70 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
71 /*
72 * Invoke DSDT corruption work-around on all Toshiba Satellite.
73 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
74 */
75 {
76 .callback = set_copy_dsdt,
77 .ident = "TOSHIBA Satellite",
78 .matches = {
79 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
80 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
81 },
82 },
83 {}
84 };
85 #else
86 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
87 {}
88 };
89 #endif
90
91 /* --------------------------------------------------------------------------
92 Device Management
93 -------------------------------------------------------------------------- */
94
acpi_bus_get_status_handle(acpi_handle handle,unsigned long long * sta)95 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
96 unsigned long long *sta)
97 {
98 acpi_status status;
99
100 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
101 if (ACPI_SUCCESS(status))
102 return AE_OK;
103
104 if (status == AE_NOT_FOUND) {
105 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
106 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
107 return AE_OK;
108 }
109 return status;
110 }
111
acpi_bus_get_status(struct acpi_device * device)112 int acpi_bus_get_status(struct acpi_device *device)
113 {
114 acpi_status status;
115 unsigned long long sta;
116
117 status = acpi_bus_get_status_handle(device->handle, &sta);
118 if (ACPI_FAILURE(status))
119 return -ENODEV;
120
121 acpi_set_device_status(device, sta);
122
123 if (device->status.functional && !device->status.present) {
124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
125 "functional but not present;\n",
126 device->pnp.bus_id, (u32)sta));
127 }
128
129 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
130 device->pnp.bus_id, (u32)sta));
131 return 0;
132 }
133 EXPORT_SYMBOL(acpi_bus_get_status);
134
acpi_bus_private_data_handler(acpi_handle handle,void * context)135 void acpi_bus_private_data_handler(acpi_handle handle,
136 void *context)
137 {
138 return;
139 }
140 EXPORT_SYMBOL(acpi_bus_private_data_handler);
141
acpi_bus_attach_private_data(acpi_handle handle,void * data)142 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
143 {
144 acpi_status status;
145
146 status = acpi_attach_data(handle,
147 acpi_bus_private_data_handler, data);
148 if (ACPI_FAILURE(status)) {
149 acpi_handle_debug(handle, "Error attaching device data\n");
150 return -ENODEV;
151 }
152
153 return 0;
154 }
155 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
156
acpi_bus_get_private_data(acpi_handle handle,void ** data)157 int acpi_bus_get_private_data(acpi_handle handle, void **data)
158 {
159 acpi_status status;
160
161 if (!*data)
162 return -EINVAL;
163
164 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
165 if (ACPI_FAILURE(status)) {
166 acpi_handle_debug(handle, "No context for object\n");
167 return -ENODEV;
168 }
169
170 return 0;
171 }
172 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
173
acpi_bus_detach_private_data(acpi_handle handle)174 void acpi_bus_detach_private_data(acpi_handle handle)
175 {
176 acpi_detach_data(handle, acpi_bus_private_data_handler);
177 }
178 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
179
acpi_print_osc_error(acpi_handle handle,struct acpi_osc_context * context,char * error)180 static void acpi_print_osc_error(acpi_handle handle,
181 struct acpi_osc_context *context, char *error)
182 {
183 int i;
184
185 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
186
187 pr_debug("_OSC request data:");
188 for (i = 0; i < context->cap.length; i += sizeof(u32))
189 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
190
191 pr_debug("\n");
192 }
193
acpi_str_to_uuid(char * str,u8 * uuid)194 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
195 {
196 int i;
197 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
198 24, 26, 28, 30, 32, 34};
199
200 if (strlen(str) != 36)
201 return AE_BAD_PARAMETER;
202 for (i = 0; i < 36; i++) {
203 if (i == 8 || i == 13 || i == 18 || i == 23) {
204 if (str[i] != '-')
205 return AE_BAD_PARAMETER;
206 } else if (!isxdigit(str[i]))
207 return AE_BAD_PARAMETER;
208 }
209 for (i = 0; i < 16; i++) {
210 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
211 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
212 }
213 return AE_OK;
214 }
215 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
216
acpi_run_osc(acpi_handle handle,struct acpi_osc_context * context)217 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
218 {
219 acpi_status status;
220 struct acpi_object_list input;
221 union acpi_object in_params[4];
222 union acpi_object *out_obj;
223 u8 uuid[16];
224 u32 errors;
225 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
226
227 if (!context)
228 return AE_ERROR;
229 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
230 return AE_ERROR;
231 context->ret.length = ACPI_ALLOCATE_BUFFER;
232 context->ret.pointer = NULL;
233
234 /* Setting up input parameters */
235 input.count = 4;
236 input.pointer = in_params;
237 in_params[0].type = ACPI_TYPE_BUFFER;
238 in_params[0].buffer.length = 16;
239 in_params[0].buffer.pointer = uuid;
240 in_params[1].type = ACPI_TYPE_INTEGER;
241 in_params[1].integer.value = context->rev;
242 in_params[2].type = ACPI_TYPE_INTEGER;
243 in_params[2].integer.value = context->cap.length/sizeof(u32);
244 in_params[3].type = ACPI_TYPE_BUFFER;
245 in_params[3].buffer.length = context->cap.length;
246 in_params[3].buffer.pointer = context->cap.pointer;
247
248 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
249 if (ACPI_FAILURE(status))
250 return status;
251
252 if (!output.length)
253 return AE_NULL_OBJECT;
254
255 out_obj = output.pointer;
256 if (out_obj->type != ACPI_TYPE_BUFFER
257 || out_obj->buffer.length != context->cap.length) {
258 acpi_print_osc_error(handle, context,
259 "_OSC evaluation returned wrong type");
260 status = AE_TYPE;
261 goto out_kfree;
262 }
263 /* Need to ignore the bit0 in result code */
264 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
265 if (errors) {
266 if (errors & OSC_REQUEST_ERROR)
267 acpi_print_osc_error(handle, context,
268 "_OSC request failed");
269 if (errors & OSC_INVALID_UUID_ERROR)
270 acpi_print_osc_error(handle, context,
271 "_OSC invalid UUID");
272 if (errors & OSC_INVALID_REVISION_ERROR)
273 acpi_print_osc_error(handle, context,
274 "_OSC invalid revision");
275 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
276 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
277 & OSC_QUERY_ENABLE)
278 goto out_success;
279 status = AE_SUPPORT;
280 goto out_kfree;
281 }
282 status = AE_ERROR;
283 goto out_kfree;
284 }
285 out_success:
286 context->ret.length = out_obj->buffer.length;
287 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
288 context->ret.length, GFP_KERNEL);
289 if (!context->ret.pointer) {
290 status = AE_NO_MEMORY;
291 goto out_kfree;
292 }
293 status = AE_OK;
294
295 out_kfree:
296 kfree(output.pointer);
297 if (status != AE_OK)
298 context->ret.pointer = NULL;
299 return status;
300 }
301 EXPORT_SYMBOL(acpi_run_osc);
302
303 bool osc_sb_apei_support_acked;
304
305 /*
306 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
307 * OSPM supports platform coordinated low power idle(LPI) states
308 */
309 bool osc_pc_lpi_support_confirmed;
310 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
311
312 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
acpi_bus_osc_support(void)313 static void acpi_bus_osc_support(void)
314 {
315 u32 capbuf[2];
316 struct acpi_osc_context context = {
317 .uuid_str = sb_uuid_str,
318 .rev = 1,
319 .cap.length = 8,
320 .cap.pointer = capbuf,
321 };
322 acpi_handle handle;
323
324 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
325 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
326 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
328 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
329 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
330
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
332 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
333
334 if (!ghes_disable)
335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
336 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
337 return;
338 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
339 u32 *capbuf_ret = context.ret.pointer;
340 if (context.ret.length > OSC_SUPPORT_DWORD) {
341 osc_sb_apei_support_acked =
342 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
343 osc_pc_lpi_support_confirmed =
344 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
345 }
346 kfree(context.ret.pointer);
347 }
348 /* do we need to check other returned cap? Sounds no */
349 }
350
351 /* --------------------------------------------------------------------------
352 Notification Handling
353 -------------------------------------------------------------------------- */
354
355 /**
356 * acpi_bus_notify
357 * ---------------
358 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
359 */
acpi_bus_notify(acpi_handle handle,u32 type,void * data)360 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
361 {
362 struct acpi_device *adev;
363 struct acpi_driver *driver;
364 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
365 bool hotplug_event = false;
366
367 switch (type) {
368 case ACPI_NOTIFY_BUS_CHECK:
369 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
370 hotplug_event = true;
371 break;
372
373 case ACPI_NOTIFY_DEVICE_CHECK:
374 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
375 hotplug_event = true;
376 break;
377
378 case ACPI_NOTIFY_DEVICE_WAKE:
379 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
380 break;
381
382 case ACPI_NOTIFY_EJECT_REQUEST:
383 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
384 hotplug_event = true;
385 break;
386
387 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
388 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
389 /* TBD: Exactly what does 'light' mean? */
390 break;
391
392 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
393 acpi_handle_err(handle, "Device cannot be configured due "
394 "to a frequency mismatch\n");
395 break;
396
397 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
398 acpi_handle_err(handle, "Device cannot be configured due "
399 "to a bus mode mismatch\n");
400 break;
401
402 case ACPI_NOTIFY_POWER_FAULT:
403 acpi_handle_err(handle, "Device has suffered a power fault\n");
404 break;
405
406 default:
407 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
408 break;
409 }
410
411 adev = acpi_bus_get_acpi_device(handle);
412 if (!adev)
413 goto err;
414
415 driver = adev->driver;
416 if (driver && driver->ops.notify &&
417 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
418 driver->ops.notify(adev, type);
419
420 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
421 return;
422
423 acpi_bus_put_acpi_device(adev);
424 return;
425
426 err:
427 acpi_evaluate_ost(handle, type, ost_code, NULL);
428 }
429
acpi_device_notify(acpi_handle handle,u32 event,void * data)430 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
431 {
432 struct acpi_device *device = data;
433
434 device->driver->ops.notify(device, event);
435 }
436
acpi_device_notify_fixed(void * data)437 static void acpi_device_notify_fixed(void *data)
438 {
439 struct acpi_device *device = data;
440
441 /* Fixed hardware devices have no handles */
442 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
443 }
444
acpi_device_fixed_event(void * data)445 static u32 acpi_device_fixed_event(void *data)
446 {
447 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
448 return ACPI_INTERRUPT_HANDLED;
449 }
450
acpi_device_install_notify_handler(struct acpi_device * device)451 static int acpi_device_install_notify_handler(struct acpi_device *device)
452 {
453 acpi_status status;
454
455 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
456 status =
457 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
458 acpi_device_fixed_event,
459 device);
460 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
461 status =
462 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
463 acpi_device_fixed_event,
464 device);
465 else
466 status = acpi_install_notify_handler(device->handle,
467 ACPI_DEVICE_NOTIFY,
468 acpi_device_notify,
469 device);
470
471 if (ACPI_FAILURE(status))
472 return -EINVAL;
473 return 0;
474 }
475
acpi_device_remove_notify_handler(struct acpi_device * device)476 static void acpi_device_remove_notify_handler(struct acpi_device *device)
477 {
478 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
479 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
480 acpi_device_fixed_event);
481 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
482 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
483 acpi_device_fixed_event);
484 else
485 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
486 acpi_device_notify);
487 }
488
489 /* Handle events targeting \_SB device (at present only graceful shutdown) */
490
491 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
492 #define ACPI_SB_INDICATE_INTERVAL 10000
493
sb_notify_work(struct work_struct * dummy)494 static void sb_notify_work(struct work_struct *dummy)
495 {
496 acpi_handle sb_handle;
497
498 orderly_poweroff(true);
499
500 /*
501 * After initiating graceful shutdown, the ACPI spec requires OSPM
502 * to evaluate _OST method once every 10seconds to indicate that
503 * the shutdown is in progress
504 */
505 acpi_get_handle(NULL, "\\_SB", &sb_handle);
506 while (1) {
507 pr_info("Graceful shutdown in progress.\n");
508 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
509 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
510 msleep(ACPI_SB_INDICATE_INTERVAL);
511 }
512 }
513
acpi_sb_notify(acpi_handle handle,u32 event,void * data)514 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
515 {
516 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
517
518 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
519 if (!work_busy(&acpi_sb_work))
520 schedule_work(&acpi_sb_work);
521 } else
522 pr_warn("event %x is not supported by \\_SB device\n", event);
523 }
524
acpi_setup_sb_notify_handler(void)525 static int __init acpi_setup_sb_notify_handler(void)
526 {
527 acpi_handle sb_handle;
528
529 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
530 return -ENXIO;
531
532 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
533 acpi_sb_notify, NULL)))
534 return -EINVAL;
535
536 return 0;
537 }
538
539 /* --------------------------------------------------------------------------
540 Device Matching
541 -------------------------------------------------------------------------- */
542
543 /**
544 * acpi_get_first_physical_node - Get first physical node of an ACPI device
545 * @adev: ACPI device in question
546 *
547 * Return: First physical node of ACPI device @adev
548 */
acpi_get_first_physical_node(struct acpi_device * adev)549 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
550 {
551 struct mutex *physical_node_lock = &adev->physical_node_lock;
552 struct device *phys_dev;
553
554 mutex_lock(physical_node_lock);
555 if (list_empty(&adev->physical_node_list)) {
556 phys_dev = NULL;
557 } else {
558 const struct acpi_device_physical_node *node;
559
560 node = list_first_entry(&adev->physical_node_list,
561 struct acpi_device_physical_node, node);
562
563 phys_dev = node->dev;
564 }
565 mutex_unlock(physical_node_lock);
566 return phys_dev;
567 }
568
acpi_primary_dev_companion(struct acpi_device * adev,const struct device * dev)569 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
570 const struct device *dev)
571 {
572 const struct device *phys_dev = acpi_get_first_physical_node(adev);
573
574 return phys_dev && phys_dev == dev ? adev : NULL;
575 }
576
577 /**
578 * acpi_device_is_first_physical_node - Is given dev first physical node
579 * @adev: ACPI companion device
580 * @dev: Physical device to check
581 *
582 * Function checks if given @dev is the first physical devices attached to
583 * the ACPI companion device. This distinction is needed in some cases
584 * where the same companion device is shared between many physical devices.
585 *
586 * Note that the caller have to provide valid @adev pointer.
587 */
acpi_device_is_first_physical_node(struct acpi_device * adev,const struct device * dev)588 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
589 const struct device *dev)
590 {
591 return !!acpi_primary_dev_companion(adev, dev);
592 }
593
594 /*
595 * acpi_companion_match() - Can we match via ACPI companion device
596 * @dev: Device in question
597 *
598 * Check if the given device has an ACPI companion and if that companion has
599 * a valid list of PNP IDs, and if the device is the first (primary) physical
600 * device associated with it. Return the companion pointer if that's the case
601 * or NULL otherwise.
602 *
603 * If multiple physical devices are attached to a single ACPI companion, we need
604 * to be careful. The usage scenario for this kind of relationship is that all
605 * of the physical devices in question use resources provided by the ACPI
606 * companion. A typical case is an MFD device where all the sub-devices share
607 * the parent's ACPI companion. In such cases we can only allow the primary
608 * (first) physical device to be matched with the help of the companion's PNP
609 * IDs.
610 *
611 * Additional physical devices sharing the ACPI companion can still use
612 * resources available from it but they will be matched normally using functions
613 * provided by their bus types (and analogously for their modalias).
614 */
acpi_companion_match(const struct device * dev)615 struct acpi_device *acpi_companion_match(const struct device *dev)
616 {
617 struct acpi_device *adev;
618
619 adev = ACPI_COMPANION(dev);
620 if (!adev)
621 return NULL;
622
623 if (list_empty(&adev->pnp.ids))
624 return NULL;
625
626 return acpi_primary_dev_companion(adev, dev);
627 }
628
629 /**
630 * acpi_of_match_device - Match device object using the "compatible" property.
631 * @adev: ACPI device object to match.
632 * @of_match_table: List of device IDs to match against.
633 *
634 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
635 * identifiers and a _DSD object with the "compatible" property, use that
636 * property to match against the given list of identifiers.
637 */
acpi_of_match_device(struct acpi_device * adev,const struct of_device_id * of_match_table)638 static bool acpi_of_match_device(struct acpi_device *adev,
639 const struct of_device_id *of_match_table)
640 {
641 const union acpi_object *of_compatible, *obj;
642 int i, nval;
643
644 if (!adev)
645 return false;
646
647 of_compatible = adev->data.of_compatible;
648 if (!of_match_table || !of_compatible)
649 return false;
650
651 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
652 nval = of_compatible->package.count;
653 obj = of_compatible->package.elements;
654 } else { /* Must be ACPI_TYPE_STRING. */
655 nval = 1;
656 obj = of_compatible;
657 }
658 /* Now we can look for the driver DT compatible strings */
659 for (i = 0; i < nval; i++, obj++) {
660 const struct of_device_id *id;
661
662 for (id = of_match_table; id->compatible[0]; id++)
663 if (!strcasecmp(obj->string.pointer, id->compatible))
664 return true;
665 }
666
667 return false;
668 }
669
__acpi_match_device_cls(const struct acpi_device_id * id,struct acpi_hardware_id * hwid)670 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
671 struct acpi_hardware_id *hwid)
672 {
673 int i, msk, byte_shift;
674 char buf[3];
675
676 if (!id->cls)
677 return false;
678
679 /* Apply class-code bitmask, before checking each class-code byte */
680 for (i = 1; i <= 3; i++) {
681 byte_shift = 8 * (3 - i);
682 msk = (id->cls_msk >> byte_shift) & 0xFF;
683 if (!msk)
684 continue;
685
686 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
687 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
688 return false;
689 }
690 return true;
691 }
692
__acpi_match_device(struct acpi_device * device,const struct acpi_device_id * ids,const struct of_device_id * of_ids)693 static const struct acpi_device_id *__acpi_match_device(
694 struct acpi_device *device,
695 const struct acpi_device_id *ids,
696 const struct of_device_id *of_ids)
697 {
698 const struct acpi_device_id *id;
699 struct acpi_hardware_id *hwid;
700
701 /*
702 * If the device is not present, it is unnecessary to load device
703 * driver for it.
704 */
705 if (!device || !device->status.present)
706 return NULL;
707
708 list_for_each_entry(hwid, &device->pnp.ids, list) {
709 /* First, check the ACPI/PNP IDs provided by the caller. */
710 for (id = ids; id->id[0] || id->cls; id++) {
711 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
712 return id;
713 else if (id->cls && __acpi_match_device_cls(id, hwid))
714 return id;
715 }
716
717 /*
718 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
719 * "compatible" property if found.
720 *
721 * The id returned by the below is not valid, but the only
722 * caller passing non-NULL of_ids here is only interested in
723 * whether or not the return value is NULL.
724 */
725 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
726 && acpi_of_match_device(device, of_ids))
727 return id;
728 }
729 return NULL;
730 }
731
732 /**
733 * acpi_match_device - Match a struct device against a given list of ACPI IDs
734 * @ids: Array of struct acpi_device_id object to match against.
735 * @dev: The device structure to match.
736 *
737 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
738 * object for that handle and use that object to match against a given list of
739 * device IDs.
740 *
741 * Return a pointer to the first matching ID on success or %NULL on failure.
742 */
acpi_match_device(const struct acpi_device_id * ids,const struct device * dev)743 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
744 const struct device *dev)
745 {
746 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
747 }
748 EXPORT_SYMBOL_GPL(acpi_match_device);
749
acpi_match_device_ids(struct acpi_device * device,const struct acpi_device_id * ids)750 int acpi_match_device_ids(struct acpi_device *device,
751 const struct acpi_device_id *ids)
752 {
753 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
754 }
755 EXPORT_SYMBOL(acpi_match_device_ids);
756
acpi_driver_match_device(struct device * dev,const struct device_driver * drv)757 bool acpi_driver_match_device(struct device *dev,
758 const struct device_driver *drv)
759 {
760 if (!drv->acpi_match_table)
761 return acpi_of_match_device(ACPI_COMPANION(dev),
762 drv->of_match_table);
763
764 return !!__acpi_match_device(acpi_companion_match(dev),
765 drv->acpi_match_table, drv->of_match_table);
766 }
767 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
768
769 /* --------------------------------------------------------------------------
770 ACPI Driver Management
771 -------------------------------------------------------------------------- */
772
773 /**
774 * acpi_bus_register_driver - register a driver with the ACPI bus
775 * @driver: driver being registered
776 *
777 * Registers a driver with the ACPI bus. Searches the namespace for all
778 * devices that match the driver's criteria and binds. Returns zero for
779 * success or a negative error status for failure.
780 */
acpi_bus_register_driver(struct acpi_driver * driver)781 int acpi_bus_register_driver(struct acpi_driver *driver)
782 {
783 int ret;
784
785 if (acpi_disabled)
786 return -ENODEV;
787 driver->drv.name = driver->name;
788 driver->drv.bus = &acpi_bus_type;
789 driver->drv.owner = driver->owner;
790
791 ret = driver_register(&driver->drv);
792 return ret;
793 }
794
795 EXPORT_SYMBOL(acpi_bus_register_driver);
796
797 /**
798 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
799 * @driver: driver to unregister
800 *
801 * Unregisters a driver with the ACPI bus. Searches the namespace for all
802 * devices that match the driver's criteria and unbinds.
803 */
acpi_bus_unregister_driver(struct acpi_driver * driver)804 void acpi_bus_unregister_driver(struct acpi_driver *driver)
805 {
806 driver_unregister(&driver->drv);
807 }
808
809 EXPORT_SYMBOL(acpi_bus_unregister_driver);
810
811 /* --------------------------------------------------------------------------
812 ACPI Bus operations
813 -------------------------------------------------------------------------- */
814
acpi_bus_match(struct device * dev,struct device_driver * drv)815 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
816 {
817 struct acpi_device *acpi_dev = to_acpi_device(dev);
818 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
819
820 return acpi_dev->flags.match_driver
821 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
822 }
823
acpi_device_uevent(struct device * dev,struct kobj_uevent_env * env)824 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
825 {
826 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
827 }
828
acpi_device_probe(struct device * dev)829 static int acpi_device_probe(struct device *dev)
830 {
831 struct acpi_device *acpi_dev = to_acpi_device(dev);
832 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
833 int ret;
834
835 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
836 return -EINVAL;
837
838 if (!acpi_drv->ops.add)
839 return -ENOSYS;
840
841 ret = acpi_drv->ops.add(acpi_dev);
842 if (ret)
843 return ret;
844
845 acpi_dev->driver = acpi_drv;
846 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847 "Driver [%s] successfully bound to device [%s]\n",
848 acpi_drv->name, acpi_dev->pnp.bus_id));
849
850 if (acpi_drv->ops.notify) {
851 ret = acpi_device_install_notify_handler(acpi_dev);
852 if (ret) {
853 if (acpi_drv->ops.remove)
854 acpi_drv->ops.remove(acpi_dev);
855
856 acpi_dev->driver = NULL;
857 acpi_dev->driver_data = NULL;
858 return ret;
859 }
860 }
861
862 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
863 acpi_drv->name, acpi_dev->pnp.bus_id));
864 get_device(dev);
865 return 0;
866 }
867
acpi_device_remove(struct device * dev)868 static int acpi_device_remove(struct device * dev)
869 {
870 struct acpi_device *acpi_dev = to_acpi_device(dev);
871 struct acpi_driver *acpi_drv = acpi_dev->driver;
872
873 if (acpi_drv) {
874 if (acpi_drv->ops.notify)
875 acpi_device_remove_notify_handler(acpi_dev);
876 if (acpi_drv->ops.remove)
877 acpi_drv->ops.remove(acpi_dev);
878 }
879 acpi_dev->driver = NULL;
880 acpi_dev->driver_data = NULL;
881
882 put_device(dev);
883 return 0;
884 }
885
886 struct bus_type acpi_bus_type = {
887 .name = "acpi",
888 .match = acpi_bus_match,
889 .probe = acpi_device_probe,
890 .remove = acpi_device_remove,
891 .uevent = acpi_device_uevent,
892 };
893
894 /* --------------------------------------------------------------------------
895 Initialization/Cleanup
896 -------------------------------------------------------------------------- */
897
acpi_bus_init_irq(void)898 static int __init acpi_bus_init_irq(void)
899 {
900 acpi_status status;
901 char *message = NULL;
902
903
904 /*
905 * Let the system know what interrupt model we are using by
906 * evaluating the \_PIC object, if exists.
907 */
908
909 switch (acpi_irq_model) {
910 case ACPI_IRQ_MODEL_PIC:
911 message = "PIC";
912 break;
913 case ACPI_IRQ_MODEL_IOAPIC:
914 message = "IOAPIC";
915 break;
916 case ACPI_IRQ_MODEL_IOSAPIC:
917 message = "IOSAPIC";
918 break;
919 case ACPI_IRQ_MODEL_GIC:
920 message = "GIC";
921 break;
922 case ACPI_IRQ_MODEL_PLATFORM:
923 message = "platform specific model";
924 break;
925 default:
926 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
927 return -ENODEV;
928 }
929
930 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
931
932 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
933 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
934 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
935 return -ENODEV;
936 }
937
938 return 0;
939 }
940
941 /**
942 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
943 *
944 * The ACPI tables are accessible after this, but the handling of events has not
945 * been initialized and the global lock is not available yet, so AML should not
946 * be executed at this point.
947 *
948 * Doing this before switching the EFI runtime services to virtual mode allows
949 * the EfiBootServices memory to be freed slightly earlier on boot.
950 */
acpi_early_init(void)951 void __init acpi_early_init(void)
952 {
953 acpi_status status;
954
955 if (acpi_disabled)
956 return;
957
958 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
959
960 /* It's safe to verify table checksums during late stage */
961 acpi_gbl_verify_table_checksum = TRUE;
962
963 /* enable workarounds, unless strict ACPI spec. compliance */
964 if (!acpi_strict)
965 acpi_gbl_enable_interpreter_slack = TRUE;
966
967 acpi_gbl_permanent_mmap = 1;
968
969 /*
970 * If the machine falls into the DMI check table,
971 * DSDT will be copied to memory
972 */
973 dmi_check_system(dsdt_dmi_table);
974
975 status = acpi_reallocate_root_table();
976 if (ACPI_FAILURE(status)) {
977 printk(KERN_ERR PREFIX
978 "Unable to reallocate ACPI tables\n");
979 goto error0;
980 }
981
982 status = acpi_initialize_subsystem();
983 if (ACPI_FAILURE(status)) {
984 printk(KERN_ERR PREFIX
985 "Unable to initialize the ACPI Interpreter\n");
986 goto error0;
987 }
988
989 if (!acpi_gbl_parse_table_as_term_list &&
990 acpi_gbl_group_module_level_code) {
991 status = acpi_load_tables();
992 if (ACPI_FAILURE(status)) {
993 printk(KERN_ERR PREFIX
994 "Unable to load the System Description Tables\n");
995 goto error0;
996 }
997 }
998
999 #ifdef CONFIG_X86
1000 if (!acpi_ioapic) {
1001 /* compatible (0) means level (3) */
1002 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1003 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1004 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1005 }
1006 /* Set PIC-mode SCI trigger type */
1007 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1008 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1009 } else {
1010 /*
1011 * now that acpi_gbl_FADT is initialized,
1012 * update it with result from INT_SRC_OVR parsing
1013 */
1014 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1015 }
1016 #endif
1017 return;
1018
1019 error0:
1020 disable_acpi();
1021 }
1022
1023 /**
1024 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1025 *
1026 * Switch over the platform to the ACPI mode (if possible).
1027 *
1028 * Doing this too early is generally unsafe, but at the same time it needs to be
1029 * done before all things that really depend on ACPI. The right spot appears to
1030 * be before finalizing the EFI initialization.
1031 */
acpi_subsystem_init(void)1032 void __init acpi_subsystem_init(void)
1033 {
1034 acpi_status status;
1035
1036 if (acpi_disabled)
1037 return;
1038
1039 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1040 if (ACPI_FAILURE(status)) {
1041 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1042 disable_acpi();
1043 } else {
1044 /*
1045 * If the system is using ACPI then we can be reasonably
1046 * confident that any regulators are managed by the firmware
1047 * so tell the regulator core it has everything it needs to
1048 * know.
1049 */
1050 regulator_has_full_constraints();
1051 }
1052 }
1053
acpi_bus_table_handler(u32 event,void * table,void * context)1054 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1055 {
1056 acpi_scan_table_handler(event, table, context);
1057
1058 return acpi_sysfs_table_handler(event, table, context);
1059 }
1060
acpi_bus_init(void)1061 static int __init acpi_bus_init(void)
1062 {
1063 int result;
1064 acpi_status status;
1065
1066 acpi_os_initialize1();
1067
1068 /*
1069 * ACPI 2.0 requires the EC driver to be loaded and work before
1070 * the EC device is found in the namespace (i.e. before
1071 * acpi_load_tables() is called).
1072 *
1073 * This is accomplished by looking for the ECDT table, and getting
1074 * the EC parameters out of that.
1075 */
1076 status = acpi_ec_ecdt_probe();
1077 /* Ignore result. Not having an ECDT is not fatal. */
1078
1079 if (acpi_gbl_parse_table_as_term_list ||
1080 !acpi_gbl_group_module_level_code) {
1081 status = acpi_load_tables();
1082 if (ACPI_FAILURE(status)) {
1083 printk(KERN_ERR PREFIX
1084 "Unable to load the System Description Tables\n");
1085 goto error1;
1086 }
1087 }
1088
1089 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1090 if (ACPI_FAILURE(status)) {
1091 printk(KERN_ERR PREFIX
1092 "Unable to start the ACPI Interpreter\n");
1093 goto error1;
1094 }
1095
1096 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1097 if (ACPI_FAILURE(status)) {
1098 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1099 goto error1;
1100 }
1101
1102 /* Set capability bits for _OSC under processor scope */
1103 acpi_early_processor_osc();
1104
1105 /*
1106 * _OSC method may exist in module level code,
1107 * so it must be run after ACPI_FULL_INITIALIZATION
1108 */
1109 acpi_bus_osc_support();
1110
1111 /*
1112 * _PDC control method may load dynamic SSDT tables,
1113 * and we need to install the table handler before that.
1114 */
1115 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1116
1117 acpi_sysfs_init();
1118
1119 acpi_early_processor_set_pdc();
1120
1121 /*
1122 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1123 * is necessary to enable it as early as possible.
1124 */
1125 acpi_ec_dsdt_probe();
1126
1127 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1128
1129 /* Initialize sleep structures */
1130 acpi_sleep_init();
1131
1132 /*
1133 * Get the system interrupt model and evaluate \_PIC.
1134 */
1135 result = acpi_bus_init_irq();
1136 if (result)
1137 goto error1;
1138
1139 /*
1140 * Register the for all standard device notifications.
1141 */
1142 status =
1143 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1144 &acpi_bus_notify, NULL);
1145 if (ACPI_FAILURE(status)) {
1146 printk(KERN_ERR PREFIX
1147 "Unable to register for device notifications\n");
1148 goto error1;
1149 }
1150
1151 /*
1152 * Create the top ACPI proc directory
1153 */
1154 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1155
1156 result = bus_register(&acpi_bus_type);
1157 if (!result)
1158 return 0;
1159
1160 /* Mimic structured exception handling */
1161 error1:
1162 acpi_terminate();
1163 return -ENODEV;
1164 }
1165
1166 struct kobject *acpi_kobj;
1167 EXPORT_SYMBOL_GPL(acpi_kobj);
1168
acpi_init(void)1169 static int __init acpi_init(void)
1170 {
1171 int result;
1172
1173 if (acpi_disabled) {
1174 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1175 return -ENODEV;
1176 }
1177
1178 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1179 if (!acpi_kobj) {
1180 printk(KERN_WARNING "%s: kset create error\n", __func__);
1181 acpi_kobj = NULL;
1182 }
1183
1184 init_acpi_device_notify();
1185 result = acpi_bus_init();
1186 if (result) {
1187 disable_acpi();
1188 return result;
1189 }
1190
1191 pci_mmcfg_late_init();
1192 acpi_iort_init();
1193 acpi_scan_init();
1194 acpi_ec_init();
1195 acpi_debugfs_init();
1196 acpi_sleep_proc_init();
1197 acpi_wakeup_device_init();
1198 acpi_debugger_init();
1199 acpi_setup_sb_notify_handler();
1200 return 0;
1201 }
1202
1203 subsys_initcall(acpi_init);
1204