summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/nsxfname.c
blob: 03487546da5a7135c87001342a3371b2b8e89512 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: nsxfname - Public interfaces to the ACPI subsystem
 *                         ACPI Namespace oriented interfaces
 *
 * Copyright (C) 2000 - 2021, Intel Corp.
 *
 *****************************************************************************/

#define EXPORT_ACPI_INTERFACES

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acparser.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsxfname")

/* Local prototypes */
static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
				    struct acpi_pnp_device_id *source,
				    char *string_area);

/******************************************************************************
 *
 * FUNCTION:    acpi_get_handle
 *
 * PARAMETERS:  parent          - Object to search under (search scope).
 *              pathname        - Pointer to an asciiz string containing the
 *                                name
 *              ret_handle      - Where the return handle is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This routine will search for a caller specified name in the
 *              name space. The caller can restrict the search region by
 *              specifying a non NULL parent. The parent value is itself a
 *              namespace handle.
 *
 ******************************************************************************/

acpi_status
acpi_get_handle(acpi_handle parent,
		acpi_string pathname, acpi_handle *ret_handle)
{
	acpi_status status;
	struct acpi_namespace_node *node = NULL;
	struct acpi_namespace_node *prefix_node = NULL;

	ACPI_FUNCTION_ENTRY();

	/* Parameter Validation */

	if (!ret_handle || !pathname) {
		return (AE_BAD_PARAMETER);
	}

	/* Convert a parent handle to a prefix node */

	if (parent) {
		prefix_node = acpi_ns_validate_handle(parent);
		if (!prefix_node) {
			return (AE_BAD_PARAMETER);
		}
	}

	/*
	 * Valid cases are:
	 * 1) Fully qualified pathname
	 * 2) Parent + Relative pathname
	 *
	 * Error for <null Parent + relative path>
	 */
	if (ACPI_IS_ROOT_PREFIX(pathname[0])) {

		/* Pathname is fully qualified (starts with '\') */

		/* Special case for root-only, since we can't search for it */

		if (!strcmp(pathname, ACPI_NS_ROOT_PATH)) {
			*ret_handle =
			    ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
			return (AE_OK);
		}
	} else if (!prefix_node) {

		/* Relative path with null prefix is disallowed */

		return (AE_BAD_PARAMETER);
	}

	/* Find the Node and convert to a handle */

	status =
	    acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
	if (ACPI_SUCCESS(status)) {
		*ret_handle = ACPI_CAST_PTR(acpi_handle, node);
	}

	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_handle)

/******************************************************************************
 *
 * FUNCTION:    acpi_get_name
 *
 * PARAMETERS:  handle          - Handle to be converted to a pathname
 *              name_type       - Full pathname or single segment
 *              buffer          - Buffer for returned path
 *
 * RETURN:      Pointer to a string containing the fully qualified Name.
 *
 * DESCRIPTION: This routine returns the fully qualified name associated with
 *              the Handle parameter. This and the acpi_pathname_to_handle are
 *              complementary functions.
 *
 ******************************************************************************/
acpi_status
acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer *buffer)
{
	acpi_status status;

	/* Parameter validation */

	if (name_type > ACPI_NAME_TYPE_MAX) {
		return (AE_BAD_PARAMETER);
	}

	status = acpi_ut_validate_buffer(buffer);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/*
	 * Wants the single segment ACPI name.
	 * Validate handle and convert to a namespace Node
	 */
	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	if (name_type == ACPI_FULL_PATHNAME ||
	    name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {

		/* Get the full pathname (From the namespace root) */

		status = acpi_ns_handle_to_pathname(handle, buffer,
						    name_type ==
						    ACPI_FULL_PATHNAME ? FALSE :
						    TRUE);
	} else {
		/* Get the single name */

		status = acpi_ns_handle_to_name(handle, buffer);
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_name)

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_copy_device_id
 *
 * PARAMETERS:  dest                - Pointer to the destination PNP_DEVICE_ID
 *              source              - Pointer to the source PNP_DEVICE_ID
 *              string_area         - Pointer to where to copy the dest string
 *
 * RETURN:      Pointer to the next string area
 *
 * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
 *
 ******************************************************************************/
static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
				    struct acpi_pnp_device_id *source,
				    char *string_area)
{
	/* Create the destination PNP_DEVICE_ID */

	dest->string = string_area;
	dest->length = source->length;

	/* Copy actual string and return a pointer to the next string area */

	memcpy(string_area, source->string, source->length);
	return (string_area + source->length);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_get_object_info
 *
 * PARAMETERS:  handle              - Object Handle
 *              return_buffer       - Where the info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Returns information about an object as gleaned from the
 *              namespace node and possibly by running several standard
 *              control methods (Such as in the case of a device.)
 *
 * For Device and Processor objects, run the Device _HID, _UID, _CID,
 * _CLS, _ADR, _sx_w, and _sx_d methods.
 *
 * Note: Allocates the return buffer, must be freed by the caller.
 *
 * Note: This interface is intended to be used during the initial device
 * discovery namespace traversal. Therefore, no complex methods can be
 * executed, especially those that access operation regions. Therefore, do
 * not add any additional methods that could cause problems in this area.
 * Because of this reason support for the following methods has been removed:
 * 1) _SUB method was removed (11/2015)
 * 2) _STA method was removed (02/2018)
 *
 ******************************************************************************/

acpi_status
acpi_get_object_info(acpi_handle handle,
		     struct acpi_device_info **return_buffer)
{
	struct acpi_namespace_node *node;
	struct acpi_device_info *info;
	struct acpi_pnp_device_id_list *cid_list = NULL;
	struct acpi_pnp_device_id *hid = NULL;
	struct acpi_pnp_device_id *uid = NULL;
	struct acpi_pnp_device_id *cls = NULL;
	char *next_id_string;
	acpi_object_type type;
	acpi_name name;
	u8 param_count = 0;
	u16 valid = 0;
	u32 info_size;
	u32 i;
	acpi_status status;

	/* Parameter validation */

	if (!handle || !return_buffer) {
		return (AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	node = acpi_ns_validate_handle(handle);
	if (!node) {
		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
		return (AE_BAD_PARAMETER);
	}

	/* Get the namespace node data while the namespace is locked */

	info_size = sizeof(struct acpi_device_info);
	type = node->type;
	name = node->name.integer;

	if (node->type == ACPI_TYPE_METHOD) {
		param_count = node->object->method.param_count;
	}

	status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
		/*
		 * Get extra info for ACPI Device/Processor objects only:
		 * Run the Device _HID, _UID, _CLS, and _CID methods.
		 *
		 * Note: none of these methods are required, so they may or may
		 * not be present for this device. The Info->Valid bitfield is used
		 * to indicate which methods were found and run successfully.
		 */

		/* Execute the Device._HID method */

		status = acpi_ut_execute_HID(node, &hid);
		if (ACPI_SUCCESS(status)) {
			info_size += hid->length;
			valid |= ACPI_VALID_HID;
		}

		/* Execute the Device._UID method */

		status = acpi_ut_execute_UID(node, &uid);
		if (ACPI_SUCCESS(status)) {
			info_size += uid->length;
			valid |= ACPI_VALID_UID;
		}

		/* Execute the Device._CID method */

		status = acpi_ut_execute_CID(node, &cid_list);
		if (ACPI_SUCCESS(status)) {

			/* Add size of CID strings and CID pointer array */

			info_size +=
			    (cid_list->list_size -
			     sizeof(struct acpi_pnp_device_id_list));
			valid |= ACPI_VALID_CID;
		}

		/* Execute the Device._CLS method */

		status = acpi_ut_execute_CLS(node, &cls);
		if (ACPI_SUCCESS(status)) {
			info_size += cls->length;
			valid |= ACPI_VALID_CLS;
		}
	}

	/*
	 * Now that we have the variable-length data, we can allocate the
	 * return buffer
	 */
	info = ACPI_ALLOCATE_ZEROED(info_size);
	if (!info) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Get the fixed-length data */

	if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
		/*
		 * Get extra info for ACPI Device/Processor objects only:
		 * Run the _ADR and, sx_w, and _sx_d methods.
		 *
		 * Notes: none of these methods are required, so they may or may
		 * not be present for this device. The Info->Valid bitfield is used
		 * to indicate which methods were found and run successfully.
		 */

		/* Execute the Device._ADR method */

		status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
							 &info->address);
		if (ACPI_SUCCESS(status)) {
			valid |= ACPI_VALID_ADR;
		}

		/* Execute the Device._sx_w methods */

		status = acpi_ut_execute_power_methods(node,
						       acpi_gbl_lowest_dstate_names,
						       ACPI_NUM_sx_w_METHODS,
						       info->lowest_dstates);
		if (ACPI_SUCCESS(status)) {
			valid |= ACPI_VALID_SXWS;
		}

		/* Execute the Device._sx_d methods */

		status = acpi_ut_execute_power_methods(node,
						       acpi_gbl_highest_dstate_names,
						       ACPI_NUM_sx_d_METHODS,
						       info->highest_dstates);
		if (ACPI_SUCCESS(status)) {
			valid |= ACPI_VALID_SXDS;
		}
	}

	/*
	 * Create a pointer to the string area of the return buffer.
	 * Point to the end of the base struct acpi_device_info structure.
	 */
	next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
	if (cid_list) {

		/* Point past the CID PNP_DEVICE_ID array */

		next_id_string +=
		    ((acpi_size)cid_list->count *
		     sizeof(struct acpi_pnp_device_id));
	}

	/*
	 * Copy the HID, UID, and CIDs to the return buffer. The variable-length
	 * strings are copied to the reserved area at the end of the buffer.
	 *
	 * For HID and CID, check if the ID is a PCI Root Bridge.
	 */
	if (hid) {
		next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
							hid, next_id_string);

		if (acpi_ut_is_pci_root_bridge(hid->string)) {
			info->flags |= ACPI_PCI_ROOT_BRIDGE;
		}
	}

	if (uid) {
		next_id_string = acpi_ns_copy_device_id(&info->unique_id,
							uid, next_id_string);
	}

	if (cid_list) {
		info->compatible_id_list.count = cid_list->count;
		info->compatible_id_list.list_size = cid_list->list_size;

		/* Copy each CID */

		for (i = 0; i < cid_list->count; i++) {
			next_id_string =
			    acpi_ns_copy_device_id(&info->compatible_id_list.
						   ids[i], &cid_list->ids[i],
						   next_id_string);

			if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
				info->flags |= ACPI_PCI_ROOT_BRIDGE;
			}
		}
	}

	if (cls) {
		(void)acpi_ns_copy_device_id(&info->class_code,
					     cls, next_id_string);
	}

	/* Copy the fixed-length data */

	info->info_size = info_size;
	info->type = type;
	info->name = name;
	info->param_count = param_count;
	info->valid = valid;

	*return_buffer = info;
	status = AE_OK;

cleanup:
	if (hid) {
		ACPI_FREE(hid);
	}
	if (uid) {
		ACPI_FREE(uid);
	}
	if (cid_list) {
		ACPI_FREE(cid_list);
	}
	if (cls) {
		ACPI_FREE(cls);
	}
	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_object_info)

/******************************************************************************
 *
 * FUNCTION:    acpi_install_method
 *
 * PARAMETERS:  buffer         - An ACPI table containing one control method
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a control method into the namespace. If the method
 *              name already exists in the namespace, it is overwritten. The
 *              input buffer must contain a valid DSDT or SSDT containing a
 *              single control method.
 *
 ******************************************************************************/
acpi_status acpi_install_method(u8 *buffer)
{
	struct acpi_table_header *table =
	    ACPI_CAST_PTR(struct acpi_table_header, buffer);
	u8 *aml_buffer;
	u8 *aml_start;
	char *path;
	struct acpi_namespace_node *node;
	union acpi_operand_object *method_obj;
	struct acpi_parse_state parser_state;
	u32 aml_length;
	u16 opcode;
	u8 method_flags;
	acpi_status status;

	/* Parameter validation */

	if (!buffer) {
		return (AE_BAD_PARAMETER);
	}

	/* Table must be a DSDT or SSDT */

	if (!ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_DSDT) &&
	    !ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_SSDT)) {
		return (AE_BAD_HEADER);
	}

	/* First AML opcode in the table must be a control method */

	parser_state.aml = buffer + sizeof(struct acpi_table_header);
	opcode = acpi_ps_peek_opcode(&parser_state);
	if (opcode != AML_METHOD_OP) {
		return (AE_BAD_PARAMETER);
	}

	/* Extract method information from the raw AML */

	parser_state.aml += acpi_ps_get_opcode_size(opcode);
	parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
	path = acpi_ps_get_next_namestring(&parser_state);

	method_flags = *parser_state.aml++;
	aml_start = parser_state.aml;
	aml_length = (u32)ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);

	/*
	 * Allocate resources up-front. We don't want to have to delete a new
	 * node from the namespace if we cannot allocate memory.
	 */
	aml_buffer = ACPI_ALLOCATE(aml_length);
	if (!aml_buffer) {
		return (AE_NO_MEMORY);
	}

	method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
	if (!method_obj) {
		ACPI_FREE(aml_buffer);
		return (AE_NO_MEMORY);
	}

	/* Lock namespace for acpi_ns_lookup, we may be creating a new node */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto error_exit;
	}

	/* The lookup either returns an existing node or creates a new one */

	status =
	    acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
			   ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
			   NULL, &node);

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {	/* ns_lookup */
		if (status != AE_ALREADY_EXISTS) {
			goto error_exit;
		}

		/* Node existed previously, make sure it is a method node */

		if (node->type != ACPI_TYPE_METHOD) {
			status = AE_TYPE;
			goto error_exit;
		}
	}

	/* Copy the method AML to the local buffer */

	memcpy(aml_buffer, aml_start, aml_length);

	/* Initialize the method object with the new method's information */

	method_obj->method.aml_start = aml_buffer;
	method_obj->method.aml_length = aml_length;

	method_obj->method.param_count = (u8)
	    (method_flags & AML_METHOD_ARG_COUNT);

	if (method_flags & AML_METHOD_SERIALIZED) {
		method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;

		method_obj->method.sync_level = (u8)
		    ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
	}

	/*
	 * Now that it is complete, we can attach the new method object to
	 * the method Node (detaches/deletes any existing object)
	 */
	status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);

	/*
	 * Flag indicates AML buffer is dynamic, must be deleted later.
	 * Must be set only after attach above.
	 */
	node->flags |= ANOBJ_ALLOCATED_BUFFER;

	/* Remove local reference to the method object */

	acpi_ut_remove_reference(method_obj);
	return (status);

error_exit:

	ACPI_FREE(aml_buffer);
	ACPI_FREE(method_obj);
	return (status);
}
ACPI_EXPORT_SYMBOL(acpi_install_method)