1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: exfield - AML execution - field_unit read/write 5 * 6 * Copyright (C) 2000 - 2021, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acdispat.h" 13 #include "acinterp.h" 14 #include "amlcode.h" 15 16 #define _COMPONENT ACPI_EXECUTER 17 ACPI_MODULE_NAME("exfield") 18 19 /* 20 * This table maps the various Attrib protocols to the byte transfer 21 * length. Used for the generic serial bus. 22 */ 23 #define ACPI_INVALID_PROTOCOL_ID 0x80 24 #define ACPI_MAX_PROTOCOL_ID 0x0F 25 static const u8 acpi_protocol_lengths[] = { 26 ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */ 27 ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */ 28 0x00, /* 2 - ATTRIB_QUICK */ 29 ACPI_INVALID_PROTOCOL_ID, /* 3 - reserved */ 30 0x01, /* 4 - ATTRIB_SEND_RECEIVE */ 31 ACPI_INVALID_PROTOCOL_ID, /* 5 - reserved */ 32 0x01, /* 6 - ATTRIB_BYTE */ 33 ACPI_INVALID_PROTOCOL_ID, /* 7 - reserved */ 34 0x02, /* 8 - ATTRIB_WORD */ 35 ACPI_INVALID_PROTOCOL_ID, /* 9 - reserved */ 36 0xFF, /* A - ATTRIB_BLOCK */ 37 0xFF, /* B - ATTRIB_BYTES */ 38 0x02, /* C - ATTRIB_PROCESS_CALL */ 39 0xFF, /* D - ATTRIB_BLOCK_PROCESS_CALL */ 40 0xFF, /* E - ATTRIB_RAW_BYTES */ 41 0xFF /* F - ATTRIB_RAW_PROCESS_BYTES */ 42 }; 43 44 #define PCC_MASTER_SUBSPACE 3 45 46 /* 47 * The following macros determine a given offset is a COMD field. 48 * According to the specification, generic subspaces (types 0-2) contains a 49 * 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte 50 * COMD field starting at offset 12. 51 */ 52 #define GENERIC_SUBSPACE_COMMAND(a) (4 == a || a == 5) 53 #define MASTER_SUBSPACE_COMMAND(a) (12 <= a && a <= 15) 54 55 /******************************************************************************* 56 * 57 * FUNCTION: acpi_ex_get_protocol_buffer_length 58 * 59 * PARAMETERS: protocol_id - The type of the protocol indicated by region 60 * field access attributes 61 * return_length - Where the protocol byte transfer length is 62 * returned 63 * 64 * RETURN: Status and decoded byte transfer length 65 * 66 * DESCRIPTION: This routine returns the length of the generic_serial_bus 67 * protocol bytes 68 * 69 ******************************************************************************/ 70 71 acpi_status 72 acpi_ex_get_protocol_buffer_length(u32 protocol_id, u32 *return_length) 73 { 74 75 if ((protocol_id > ACPI_MAX_PROTOCOL_ID) || 76 (acpi_protocol_lengths[protocol_id] == ACPI_INVALID_PROTOCOL_ID)) { 77 ACPI_ERROR((AE_INFO, 78 "Invalid Field/AccessAs protocol ID: 0x%4.4X", 79 protocol_id)); 80 81 return (AE_AML_PROTOCOL); 82 } 83 84 *return_length = acpi_protocol_lengths[protocol_id]; 85 return (AE_OK); 86 } 87 88 /******************************************************************************* 89 * 90 * FUNCTION: acpi_ex_read_data_from_field 91 * 92 * PARAMETERS: walk_state - Current execution state 93 * obj_desc - The named field 94 * ret_buffer_desc - Where the return data object is stored 95 * 96 * RETURN: Status 97 * 98 * DESCRIPTION: Read from a named field. Returns either an Integer or a 99 * Buffer, depending on the size of the field and whether if a 100 * field is created by the create_field() operator. 101 * 102 ******************************************************************************/ 103 104 acpi_status 105 acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state, 106 union acpi_operand_object *obj_desc, 107 union acpi_operand_object **ret_buffer_desc) 108 { 109 acpi_status status; 110 union acpi_operand_object *buffer_desc; 111 void *buffer; 112 u32 buffer_length; 113 114 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc); 115 116 /* Parameter validation */ 117 118 if (!obj_desc) { 119 return_ACPI_STATUS(AE_AML_NO_OPERAND); 120 } 121 if (!ret_buffer_desc) { 122 return_ACPI_STATUS(AE_BAD_PARAMETER); 123 } 124 125 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { 126 /* 127 * If the buffer_field arguments have not been previously evaluated, 128 * evaluate them now and save the results. 129 */ 130 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { 131 status = acpi_ds_get_buffer_field_arguments(obj_desc); 132 if (ACPI_FAILURE(status)) { 133 return_ACPI_STATUS(status); 134 } 135 } 136 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 137 (obj_desc->field.region_obj->region.space_id == 138 ACPI_ADR_SPACE_SMBUS 139 || obj_desc->field.region_obj->region.space_id == 140 ACPI_ADR_SPACE_GSBUS 141 || obj_desc->field.region_obj->region.space_id == 142 ACPI_ADR_SPACE_IPMI 143 || obj_desc->field.region_obj->region.space_id == 144 ACPI_ADR_SPACE_PLATFORM_RT)) { 145 146 /* SMBus, GSBus, IPMI serial */ 147 148 status = acpi_ex_read_serial_bus(obj_desc, ret_buffer_desc); 149 return_ACPI_STATUS(status); 150 } 151 152 /* 153 * Allocate a buffer for the contents of the field. 154 * 155 * If the field is larger than the current integer width, create 156 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows 157 * the use of arithmetic operators on the returned value if the 158 * field size is equal or smaller than an Integer. 159 * 160 * However, all buffer fields created by create_field operator needs to 161 * remain as a buffer to match other AML interpreter implementations. 162 * 163 * Note: Field.length is in bits. 164 */ 165 buffer_length = 166 (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length); 167 168 if (buffer_length > acpi_gbl_integer_byte_width || 169 (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD && 170 obj_desc->buffer_field.is_create_field)) { 171 172 /* Field is too large for an Integer, create a Buffer instead */ 173 174 buffer_desc = acpi_ut_create_buffer_object(buffer_length); 175 if (!buffer_desc) { 176 return_ACPI_STATUS(AE_NO_MEMORY); 177 } 178 buffer = buffer_desc->buffer.pointer; 179 } else { 180 /* Field will fit within an Integer (normal case) */ 181 182 buffer_desc = acpi_ut_create_integer_object((u64) 0); 183 if (!buffer_desc) { 184 return_ACPI_STATUS(AE_NO_MEMORY); 185 } 186 187 buffer_length = acpi_gbl_integer_byte_width; 188 buffer = &buffer_desc->integer.value; 189 } 190 191 if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 192 (obj_desc->field.region_obj->region.space_id == 193 ACPI_ADR_SPACE_GPIO)) { 194 195 /* General Purpose I/O */ 196 197 status = acpi_ex_read_gpio(obj_desc, buffer); 198 goto exit; 199 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 200 (obj_desc->field.region_obj->region.space_id == 201 ACPI_ADR_SPACE_PLATFORM_COMM)) { 202 /* 203 * Reading from a PCC field unit does not require the handler because 204 * it only requires reading from the internal_pcc_buffer. 205 */ 206 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 207 "PCC FieldRead bits %u\n", 208 obj_desc->field.bit_length)); 209 210 memcpy(buffer, 211 obj_desc->field.region_obj->field.internal_pcc_buffer + 212 obj_desc->field.base_byte_offset, 213 (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field. 214 bit_length)); 215 216 *ret_buffer_desc = buffer_desc; 217 return AE_OK; 218 } 219 220 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 221 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n", 222 obj_desc, obj_desc->common.type, buffer, 223 buffer_length)); 224 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 225 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n", 226 obj_desc->common_field.bit_length, 227 obj_desc->common_field.start_field_bit_offset, 228 obj_desc->common_field.base_byte_offset)); 229 230 /* Lock entire transaction if requested */ 231 232 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 233 234 /* Read from the field */ 235 236 status = acpi_ex_extract_from_field(obj_desc, buffer, buffer_length); 237 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 238 239 exit: 240 if (ACPI_FAILURE(status)) { 241 acpi_ut_remove_reference(buffer_desc); 242 } else { 243 *ret_buffer_desc = buffer_desc; 244 } 245 246 return_ACPI_STATUS(status); 247 } 248 249 /******************************************************************************* 250 * 251 * FUNCTION: acpi_ex_write_data_to_field 252 * 253 * PARAMETERS: source_desc - Contains data to write 254 * obj_desc - The named field 255 * result_desc - Where the return value is returned, if any 256 * 257 * RETURN: Status 258 * 259 * DESCRIPTION: Write to a named field 260 * 261 ******************************************************************************/ 262 263 acpi_status 264 acpi_ex_write_data_to_field(union acpi_operand_object *source_desc, 265 union acpi_operand_object *obj_desc, 266 union acpi_operand_object **result_desc) 267 { 268 acpi_status status; 269 u32 buffer_length; 270 u32 data_length; 271 void *buffer; 272 273 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc); 274 275 /* Parameter validation */ 276 277 if (!source_desc || !obj_desc) { 278 return_ACPI_STATUS(AE_AML_NO_OPERAND); 279 } 280 281 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { 282 /* 283 * If the buffer_field arguments have not been previously evaluated, 284 * evaluate them now and save the results. 285 */ 286 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { 287 status = acpi_ds_get_buffer_field_arguments(obj_desc); 288 if (ACPI_FAILURE(status)) { 289 return_ACPI_STATUS(status); 290 } 291 } 292 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 293 (obj_desc->field.region_obj->region.space_id == 294 ACPI_ADR_SPACE_GPIO)) { 295 296 /* General Purpose I/O */ 297 298 status = acpi_ex_write_gpio(source_desc, obj_desc, result_desc); 299 return_ACPI_STATUS(status); 300 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 301 (obj_desc->field.region_obj->region.space_id == 302 ACPI_ADR_SPACE_SMBUS 303 || obj_desc->field.region_obj->region.space_id == 304 ACPI_ADR_SPACE_GSBUS 305 || obj_desc->field.region_obj->region.space_id == 306 ACPI_ADR_SPACE_IPMI 307 || obj_desc->field.region_obj->region.space_id == 308 ACPI_ADR_SPACE_PLATFORM_RT)) { 309 310 /* SMBus, GSBus, IPMI serial */ 311 312 status = 313 acpi_ex_write_serial_bus(source_desc, obj_desc, 314 result_desc); 315 return_ACPI_STATUS(status); 316 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 317 (obj_desc->field.region_obj->region.space_id == 318 ACPI_ADR_SPACE_PLATFORM_COMM)) { 319 /* 320 * According to the spec a write to the COMD field will invoke the 321 * region handler. Otherwise, write to the pcc_internal buffer. This 322 * implementation will use the offsets specified rather than the name 323 * of the field. This is considered safer because some firmware tools 324 * are known to obfiscate named objects. 325 */ 326 data_length = 327 (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field. 328 bit_length); 329 memcpy(obj_desc->field.region_obj->field.internal_pcc_buffer + 330 obj_desc->field.base_byte_offset, 331 source_desc->buffer.pointer, data_length); 332 333 if (MASTER_SUBSPACE_COMMAND(obj_desc->field.base_byte_offset)) { 334 335 /* Perform the write */ 336 337 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 338 "PCC COMD field has been written. Invoking PCC handler now.\n")); 339 340 status = 341 acpi_ex_access_region(obj_desc, 0, 342 (u64 *)obj_desc->field. 343 region_obj->field. 344 internal_pcc_buffer, 345 ACPI_WRITE); 346 return_ACPI_STATUS(status); 347 } 348 return (AE_OK); 349 } 350 351 /* Get a pointer to the data to be written */ 352 353 switch (source_desc->common.type) { 354 case ACPI_TYPE_INTEGER: 355 356 buffer = &source_desc->integer.value; 357 buffer_length = sizeof(source_desc->integer.value); 358 break; 359 360 case ACPI_TYPE_BUFFER: 361 362 buffer = source_desc->buffer.pointer; 363 buffer_length = source_desc->buffer.length; 364 break; 365 366 case ACPI_TYPE_STRING: 367 368 buffer = source_desc->string.pointer; 369 buffer_length = source_desc->string.length; 370 break; 371 372 default: 373 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 374 } 375 376 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 377 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n", 378 source_desc, 379 acpi_ut_get_type_name(source_desc->common.type), 380 source_desc->common.type, buffer, buffer_length)); 381 382 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 383 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n", 384 obj_desc, 385 acpi_ut_get_type_name(obj_desc->common.type), 386 obj_desc->common.type, 387 obj_desc->common_field.bit_length, 388 obj_desc->common_field.start_field_bit_offset, 389 obj_desc->common_field.base_byte_offset)); 390 391 /* Lock entire transaction if requested */ 392 393 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 394 395 /* Write to the field */ 396 397 status = acpi_ex_insert_into_field(obj_desc, buffer, buffer_length); 398 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 399 return_ACPI_STATUS(status); 400 } 401