drivers/acpi/acpica/exfield.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2014, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acdispat.h"
  47 #include "acinterp.h"
  48 #include "amlcode.h"
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exfield")
  52
  53 /* Local prototypes */
  54 static u32
  55 acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length);
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_ex_get_serial_access_length
  60  *
  61  * PARAMETERS:  accessor_type   - The type of the protocol indicated by region
  62  *                                field access attributes
  63  *              access_length   - The access length of the region field
  64  *
  65  * RETURN:      Decoded access length
  66  *
  67  * DESCRIPTION: This routine returns the length of the generic_serial_bus
  68  *              protocol bytes
  69  *
  70  ******************************************************************************/
  71
  72 static u32
  73 acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length)
  74 {
  75         u32 length;
  76
  77         switch (accessor_type) {
  78         case AML_FIELD_ATTRIB_QUICK:
  79
  80                 length = 0;
  81                 break;
  82
  83         case AML_FIELD_ATTRIB_SEND_RCV:
  84         case AML_FIELD_ATTRIB_BYTE:
  85
  86                 length = 1;
  87                 break;
  88
  89         case AML_FIELD_ATTRIB_WORD:
  90         case AML_FIELD_ATTRIB_WORD_CALL:
  91
  92                 length = 2;
  93                 break;
  94
  95         case AML_FIELD_ATTRIB_MULTIBYTE:
  96         case AML_FIELD_ATTRIB_RAW_BYTES:
  97         case AML_FIELD_ATTRIB_RAW_PROCESS:
  98
  99                 length = access_length;
 100                 break;
 101
 102         case AML_FIELD_ATTRIB_BLOCK:
 103         case AML_FIELD_ATTRIB_BLOCK_CALL:
 104         default:
 105
 106                 length = ACPI_GSBUS_BUFFER_SIZE - 2;
 107                 break;
 108         }
 109
 110         return (length);
 111 }
 112
 113 /*******************************************************************************
 114  *
 115  * FUNCTION:    acpi_ex_read_data_from_field
 116  *
 117  * PARAMETERS:  walk_state          - Current execution state
 118  *              obj_desc            - The named field
 119  *              ret_buffer_desc     - Where the return data object is stored
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Read from a named field. Returns either an Integer or a
 124  *              Buffer, depending on the size of the field.
 125  *
 126  ******************************************************************************/
 127
 128 acpi_status
 129 acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state,
 130                              union acpi_operand_object *obj_desc,
 131                              union acpi_operand_object **ret_buffer_desc)
 132 {
 133         acpi_status status;
 134         union acpi_operand_object *buffer_desc;
 135         acpi_size length;
 136         void *buffer;
 137         u32 function;
 138         u16 accessor_type;
 139
 140         ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
 141
 142         /* Parameter validation */
 143
 144         if (!obj_desc) {
 145                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 146         }
 147         if (!ret_buffer_desc) {
 148                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 149         }
 150
 151         if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
 152                 /*
 153                  * If the buffer_field arguments have not been previously evaluated,
 154                  * evaluate them now and save the results.
 155                  */
 156                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 157                         status = acpi_ds_get_buffer_field_arguments(obj_desc);
 158                         if (ACPI_FAILURE(status)) {
 159                                 return_ACPI_STATUS(status);
 160                         }
 161                 }
 162         } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
 163                    (obj_desc->field.region_obj->region.space_id ==
 164                     ACPI_ADR_SPACE_SMBUS
 165                     || obj_desc->field.region_obj->region.space_id ==
 166                     ACPI_ADR_SPACE_GSBUS
 167                     || obj_desc->field.region_obj->region.space_id ==
 168                     ACPI_ADR_SPACE_IPMI)) {
 169                 /*
 170                  * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
 171                  * the data and then directly access the region handler.
 172                  *
 173                  * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
 174                  */
 175                 if (obj_desc->field.region_obj->region.space_id ==
 176                     ACPI_ADR_SPACE_SMBUS) {
 177                         length = ACPI_SMBUS_BUFFER_SIZE;
 178                         function =
 179                             ACPI_READ | (obj_desc->field.attribute << 16);
 180                 } else if (obj_desc->field.region_obj->region.space_id ==
 181                            ACPI_ADR_SPACE_GSBUS) {
 182                         accessor_type = obj_desc->field.attribute;
 183                         length = acpi_ex_get_serial_access_length(accessor_type,
 184                                                                   obj_desc->
 185                                                                   field.
 186                                                                   access_length);
 187
 188                         /*
 189                          * Add additional 2 bytes for the generic_serial_bus data buffer:
 190                          *
 191                          *     Status;      (Byte 0 of the data buffer)
 192                          *     Length;      (Byte 1 of the data buffer)
 193                          *     Data[x-1];   (Bytes 2-x of the arbitrary length data buffer)
 194                          */
 195                         length += 2;
 196                         function = ACPI_READ | (accessor_type << 16);
 197                 } else {        /* IPMI */
 198
 199                         length = ACPI_IPMI_BUFFER_SIZE;
 200                         function = ACPI_READ;
 201                 }
 202
 203                 buffer_desc = acpi_ut_create_buffer_object(length);
 204                 if (!buffer_desc) {
 205                         return_ACPI_STATUS(AE_NO_MEMORY);
 206                 }
 207
 208                 /* Lock entire transaction if requested */
 209
 210                 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 211
 212                 /* Call the region handler for the read */
 213
 214                 status = acpi_ex_access_region(obj_desc, 0,
 215                                                ACPI_CAST_PTR(u64,
 216                                                              buffer_desc->
 217                                                              buffer.pointer),
 218                                                function);
 219                 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
 220                 goto exit;
 221         }
 222
 223         /*
 224          * Allocate a buffer for the contents of the field.
 225          *
 226          * If the field is larger than the current integer width, create
 227          * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
 228          * the use of arithmetic operators on the returned value if the
 229          * field size is equal or smaller than an Integer.
 230          *
 231          * Note: Field.length is in bits.
 232          */
 233         length =
 234             (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
 235         if (length > acpi_gbl_integer_byte_width) {
 236
 237                 /* Field is too large for an Integer, create a Buffer instead */
 238
 239                 buffer_desc = acpi_ut_create_buffer_object(length);
 240                 if (!buffer_desc) {
 241                         return_ACPI_STATUS(AE_NO_MEMORY);
 242                 }
 243                 buffer = buffer_desc->buffer.pointer;
 244         } else {
 245                 /* Field will fit within an Integer (normal case) */
 246
 247                 buffer_desc = acpi_ut_create_integer_object((u64) 0);
 248                 if (!buffer_desc) {
 249                         return_ACPI_STATUS(AE_NO_MEMORY);
 250                 }
 251
 252                 length = acpi_gbl_integer_byte_width;
 253                 buffer = &buffer_desc->integer.value;
 254         }
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 257                           "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
 258                           obj_desc, obj_desc->common.type, buffer,
 259                           (u32) length));
 260         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 261                           "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
 262                           obj_desc->common_field.bit_length,
 263                           obj_desc->common_field.start_field_bit_offset,
 264                           obj_desc->common_field.base_byte_offset));
 265
 266         /* Lock entire transaction if requested */
 267
 268         acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 269
 270         /* Read from the field */
 271
 272         status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
 273         acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
 274
 275 exit:
 276         if (ACPI_FAILURE(status)) {
 277                 acpi_ut_remove_reference(buffer_desc);
 278         } else {
 279                 *ret_buffer_desc = buffer_desc;
 280         }
 281
 282         return_ACPI_STATUS(status);
 283 }
 284
 285 /*******************************************************************************
 286  *
 287  * FUNCTION:    acpi_ex_write_data_to_field
 288  *
 289  * PARAMETERS:  source_desc         - Contains data to write
 290  *              obj_desc            - The named field
 291  *              result_desc         - Where the return value is returned, if any
 292  *
 293  * RETURN:      Status
 294  *
 295  * DESCRIPTION: Write to a named field
 296  *
 297  ******************************************************************************/
 298
 299 acpi_status
 300 acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 301                             union acpi_operand_object *obj_desc,
 302                             union acpi_operand_object **result_desc)
 303 {
 304         acpi_status status;
 305         u32 length;
 306         void *buffer;
 307         union acpi_operand_object *buffer_desc;
 308         u32 function;
 309         u16 accessor_type;
 310
 311         ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
 312
 313         /* Parameter validation */
 314
 315         if (!source_desc || !obj_desc) {
 316                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 317         }
 318
 319         if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
 320                 /*
 321                  * If the buffer_field arguments have not been previously evaluated,
 322                  * evaluate them now and save the results.
 323                  */
 324                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 325                         status = acpi_ds_get_buffer_field_arguments(obj_desc);
 326                         if (ACPI_FAILURE(status)) {
 327                                 return_ACPI_STATUS(status);
 328                         }
 329                 }
 330         } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
 331                    (obj_desc->field.region_obj->region.space_id ==
 332                     ACPI_ADR_SPACE_SMBUS
 333                     || obj_desc->field.region_obj->region.space_id ==
 334                     ACPI_ADR_SPACE_GSBUS
 335                     || obj_desc->field.region_obj->region.space_id ==
 336                     ACPI_ADR_SPACE_IPMI)) {
 337                 /*
 338                  * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
 339                  * mechanism and handoff the buffer directly to the handler. For
 340                  * these address spaces, the buffer is bi-directional; on a write,
 341                  * return data is returned in the same buffer.
 342                  *
 343                  * Source must be a buffer of sufficient size:
 344                  * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
 345                  *
 346                  * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
 347                  */
 348                 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
 349                         ACPI_ERROR((AE_INFO,
 350                                     "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
 351                                     acpi_ut_get_object_type_name(source_desc)));
 352
 353                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 354                 }
 355
 356                 if (obj_desc->field.region_obj->region.space_id ==
 357                     ACPI_ADR_SPACE_SMBUS) {
 358                         length = ACPI_SMBUS_BUFFER_SIZE;
 359                         function =
 360                             ACPI_WRITE | (obj_desc->field.attribute << 16);
 361                 } else if (obj_desc->field.region_obj->region.space_id ==
 362                            ACPI_ADR_SPACE_GSBUS) {
 363                         accessor_type = obj_desc->field.attribute;
 364                         length = acpi_ex_get_serial_access_length(accessor_type,
 365                                                                   obj_desc->
 366                                                                   field.
 367                                                                   access_length);
 368
 369                         /*
 370                          * Add additional 2 bytes for the generic_serial_bus data buffer:
 371                          *
 372                          *     Status;      (Byte 0 of the data buffer)
 373                          *     Length;      (Byte 1 of the data buffer)
 374                          *     Data[x-1];   (Bytes 2-x of the arbitrary length data buffer)
 375                          */
 376                         length += 2;
 377                         function = ACPI_WRITE | (accessor_type << 16);
 378                 } else {        /* IPMI */
 379
 380                         length = ACPI_IPMI_BUFFER_SIZE;
 381                         function = ACPI_WRITE;
 382                 }
 383
 384                 if (source_desc->buffer.length < length) {
 385                         ACPI_ERROR((AE_INFO,
 386                                     "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
 387                                     length, source_desc->buffer.length));
 388
 389                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 390                 }
 391
 392                 /* Create the bi-directional buffer */
 393
 394                 buffer_desc = acpi_ut_create_buffer_object(length);
 395                 if (!buffer_desc) {
 396                         return_ACPI_STATUS(AE_NO_MEMORY);
 397                 }
 398
 399                 buffer = buffer_desc->buffer.pointer;
 400                 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
 401
 402                 /* Lock entire transaction if requested */
 403
 404                 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 405
 406                 /*
 407                  * Perform the write (returns status and perhaps data in the
 408                  * same buffer)
 409                  */
 410                 status = acpi_ex_access_region(obj_desc, 0,
 411                                                (u64 *) buffer, function);
 412                 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
 413
 414                 *result_desc = buffer_desc;
 415                 return_ACPI_STATUS(status);
 416         }
 417
 418         /* Get a pointer to the data to be written */
 419
 420         switch (source_desc->common.type) {
 421         case ACPI_TYPE_INTEGER:
 422
 423                 buffer = &source_desc->integer.value;
 424                 length = sizeof(source_desc->integer.value);
 425                 break;
 426
 427         case ACPI_TYPE_BUFFER:
 428
 429                 buffer = source_desc->buffer.pointer;
 430                 length = source_desc->buffer.length;
 431                 break;
 432
 433         case ACPI_TYPE_STRING:
 434
 435                 buffer = source_desc->string.pointer;
 436                 length = source_desc->string.length;
 437                 break;
 438
 439         default:
 440
 441                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 442         }
 443
 444         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 445                           "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
 446                           source_desc,
 447                           acpi_ut_get_type_name(source_desc->common.type),
 448                           source_desc->common.type, buffer, length));
 449
 450         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 451                           "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
 452                           obj_desc,
 453                           acpi_ut_get_type_name(obj_desc->common.type),
 454                           obj_desc->common.type,
 455                           obj_desc->common_field.bit_length,
 456                           obj_desc->common_field.start_field_bit_offset,
 457                           obj_desc->common_field.base_byte_offset));
 458
 459         /* Lock entire transaction if requested */
 460
 461         acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 462
 463         /* Write to the field */
 464
 465         status = acpi_ex_insert_into_field(obj_desc, buffer, length);
 466         acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
 467
 468         return_ACPI_STATUS(status);
 469 }