summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/exfield.c
blob: 6907ce0c704c8f9eb4f9c06966930f155495d933 (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
/******************************************************************************
 *
 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2014, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exfield")

/* Local prototypes */
static u32
acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_get_serial_access_length
 *
 * PARAMETERS:  accessor_type   - The type of the protocol indicated by region
 *                                field access attributes
 *              access_length   - The access length of the region field
 *
 * RETURN:      Decoded access length
 *
 * DESCRIPTION: This routine returns the length of the generic_serial_bus
 *              protocol bytes
 *
 ******************************************************************************/

static u32
acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length)
{
	u32 length;

	switch (accessor_type) {
	case AML_FIELD_ATTRIB_QUICK:

		length = 0;
		break;

	case AML_FIELD_ATTRIB_SEND_RCV:
	case AML_FIELD_ATTRIB_BYTE:

		length = 1;
		break;

	case AML_FIELD_ATTRIB_WORD:
	case AML_FIELD_ATTRIB_WORD_CALL:

		length = 2;
		break;

	case AML_FIELD_ATTRIB_MULTIBYTE:
	case AML_FIELD_ATTRIB_RAW_BYTES:
	case AML_FIELD_ATTRIB_RAW_PROCESS:

		length = access_length;
		break;

	case AML_FIELD_ATTRIB_BLOCK:
	case AML_FIELD_ATTRIB_BLOCK_CALL:
	default:

		length = ACPI_GSBUS_BUFFER_SIZE - 2;
		break;
	}

	return (length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_read_data_from_field
 *
 * PARAMETERS:  walk_state          - Current execution state
 *              obj_desc            - The named field
 *              ret_buffer_desc     - Where the return data object is stored
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Read from a named field. Returns either an Integer or a
 *              Buffer, depending on the size of the field.
 *
 ******************************************************************************/

acpi_status
acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state,
			     union acpi_operand_object *obj_desc,
			     union acpi_operand_object **ret_buffer_desc)
{
	acpi_status status;
	union acpi_operand_object *buffer_desc;
	acpi_size length;
	void *buffer;
	u32 function;
	u16 accessor_type;

	ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);

	/* Parameter validation */

	if (!obj_desc) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}
	if (!ret_buffer_desc) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
		/*
		 * If the buffer_field arguments have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_buffer_field_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_GSBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI)) {
		/*
		 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
		 * the data and then directly access the region handler.
		 *
		 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
		 */
		if (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS) {
			length = ACPI_SMBUS_BUFFER_SIZE;
			function =
			    ACPI_READ | (obj_desc->field.attribute << 16);
		} else if (obj_desc->field.region_obj->region.space_id ==
			   ACPI_ADR_SPACE_GSBUS) {
			accessor_type = obj_desc->field.attribute;
			length = acpi_ex_get_serial_access_length(accessor_type,
								  obj_desc->
								  field.
								  access_length);

			/*
			 * Add additional 2 bytes for the generic_serial_bus data buffer:
			 *
			 *     Status;      (Byte 0 of the data buffer)
			 *     Length;      (Byte 1 of the data buffer)
			 *     Data[x-1];   (Bytes 2-x of the arbitrary length data buffer)
			 */
			length += 2;
			function = ACPI_READ | (accessor_type << 16);
		} else {	/* IPMI */

			length = ACPI_IPMI_BUFFER_SIZE;
			function = ACPI_READ;
		}

		buffer_desc = acpi_ut_create_buffer_object(length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Lock entire transaction if requested */

		acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

		/* Call the region handler for the read */

		status = acpi_ex_access_region(obj_desc, 0,
					       ACPI_CAST_PTR(u64,
							     buffer_desc->
							     buffer.pointer),
					       function);
		acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
		goto exit;
	}

	/*
	 * Allocate a buffer for the contents of the field.
	 *
	 * If the field is larger than the current integer width, create
	 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
	 * the use of arithmetic operators on the returned value if the
	 * field size is equal or smaller than an Integer.
	 *
	 * Note: Field.length is in bits.
	 */
	length =
	    (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
	if (length > acpi_gbl_integer_byte_width) {

		/* Field is too large for an Integer, create a Buffer instead */

		buffer_desc = acpi_ut_create_buffer_object(length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
		buffer = buffer_desc->buffer.pointer;
	} else {
		/* Field will fit within an Integer (normal case) */

		buffer_desc = acpi_ut_create_integer_object((u64) 0);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		length = acpi_gbl_integer_byte_width;
		buffer = &buffer_desc->integer.value;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
			  obj_desc, obj_desc->common.type, buffer,
			  (u32) length));
	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
			  obj_desc->common_field.bit_length,
			  obj_desc->common_field.start_field_bit_offset,
			  obj_desc->common_field.base_byte_offset));

	/* Lock entire transaction if requested */

	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

	/* Read from the field */

	status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

exit:
	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(buffer_desc);
	} else {
		*ret_buffer_desc = buffer_desc;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_write_data_to_field
 *
 * PARAMETERS:  source_desc         - Contains data to write
 *              obj_desc            - The named field
 *              result_desc         - Where the return value is returned, if any
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Write to a named field
 *
 ******************************************************************************/

acpi_status
acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
			    union acpi_operand_object *obj_desc,
			    union acpi_operand_object **result_desc)
{
	acpi_status status;
	u32 length;
	void *buffer;
	union acpi_operand_object *buffer_desc;
	u32 function;
	u16 accessor_type;

	ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);

	/* Parameter validation */

	if (!source_desc || !obj_desc) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
		/*
		 * If the buffer_field arguments have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_buffer_field_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_GSBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI)) {
		/*
		 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
		 * mechanism and handoff the buffer directly to the handler. For
		 * these address spaces, the buffer is bi-directional; on a write,
		 * return data is returned in the same buffer.
		 *
		 * Source must be a buffer of sufficient size:
		 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
		 *
		 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
		 */
		if (source_desc->common.type != ACPI_TYPE_BUFFER) {
			ACPI_ERROR((AE_INFO,
				    "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
				    acpi_ut_get_object_type_name(source_desc)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		if (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS) {
			length = ACPI_SMBUS_BUFFER_SIZE;
			function =
			    ACPI_WRITE | (obj_desc->field.attribute << 16);
		} else if (obj_desc->field.region_obj->region.space_id ==
			   ACPI_ADR_SPACE_GSBUS) {
			accessor_type = obj_desc->field.attribute;
			length = acpi_ex_get_serial_access_length(accessor_type,
								  obj_desc->
								  field.
								  access_length);

			/*
			 * Add additional 2 bytes for the generic_serial_bus data buffer:
			 *
			 *     Status;      (Byte 0 of the data buffer)
			 *     Length;      (Byte 1 of the data buffer)
			 *     Data[x-1];   (Bytes 2-x of the arbitrary length data buffer)
			 */
			length += 2;
			function = ACPI_WRITE | (accessor_type << 16);
		} else {	/* IPMI */

			length = ACPI_IPMI_BUFFER_SIZE;
			function = ACPI_WRITE;
		}

		if (source_desc->buffer.length < length) {
			ACPI_ERROR((AE_INFO,
				    "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
				    length, source_desc->buffer.length));

			return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
		}

		/* Create the bi-directional buffer */

		buffer_desc = acpi_ut_create_buffer_object(length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		buffer = buffer_desc->buffer.pointer;
		ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);

		/* Lock entire transaction if requested */

		acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

		/*
		 * Perform the write (returns status and perhaps data in the
		 * same buffer)
		 */
		status = acpi_ex_access_region(obj_desc, 0,
					       (u64 *) buffer, function);
		acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

		*result_desc = buffer_desc;
		return_ACPI_STATUS(status);
	}

	/* Get a pointer to the data to be written */

	switch (source_desc->common.type) {
	case ACPI_TYPE_INTEGER:

		buffer = &source_desc->integer.value;
		length = sizeof(source_desc->integer.value);
		break;

	case ACPI_TYPE_BUFFER:

		buffer = source_desc->buffer.pointer;
		length = source_desc->buffer.length;
		break;

	case ACPI_TYPE_STRING:

		buffer = source_desc->string.pointer;
		length = source_desc->string.length;
		break;

	default:

		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
			  source_desc,
			  acpi_ut_get_type_name(source_desc->common.type),
			  source_desc->common.type, buffer, length));

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
			  obj_desc,
			  acpi_ut_get_type_name(obj_desc->common.type),
			  obj_desc->common.type,
			  obj_desc->common_field.bit_length,
			  obj_desc->common_field.start_field_bit_offset,
			  obj_desc->common_field.base_byte_offset));

	/* Lock entire transaction if requested */

	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

	/* Write to the field */

	status = acpi_ex_insert_into_field(obj_desc, buffer, length);
	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

	return_ACPI_STATUS(status);
}