diff options
Diffstat (limited to 'drivers/acpi/acpica/exprep.c')
| -rw-r--r-- | drivers/acpi/acpica/exprep.c | 599 |
1 files changed, 599 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exprep.c b/drivers/acpi/acpica/exprep.c new file mode 100644 index 000000000..4a0f03157 --- /dev/null +++ b/drivers/acpi/acpica/exprep.c @@ -0,0 +1,599 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: exprep - ACPI AML field prep utilities + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acinterp.h" +#include "amlcode.h" +#include "acnamesp.h" +#include "acdispat.h" + +#define _COMPONENT ACPI_EXECUTER +ACPI_MODULE_NAME("exprep") + +/* Local prototypes */ +static u32 +acpi_ex_decode_field_access(union acpi_operand_object *obj_desc, + u8 field_flags, u32 * return_byte_alignment); + +#ifdef ACPI_UNDER_DEVELOPMENT + +static u32 +acpi_ex_generate_access(u32 field_bit_offset, + u32 field_bit_length, u32 region_length); + +/******************************************************************************* + * + * FUNCTION: acpi_ex_generate_access + * + * PARAMETERS: field_bit_offset - Start of field within parent region/buffer + * field_bit_length - Length of field in bits + * region_length - Length of parent in bytes + * + * RETURN: Field granularity (8, 16, 32 or 64) and + * byte_alignment (1, 2, 3, or 4) + * + * DESCRIPTION: Generate an optimal access width for fields defined with the + * any_acc keyword. + * + * NOTE: Need to have the region_length in order to check for boundary + * conditions (end-of-region). However, the region_length is a deferred + * operation. Therefore, to complete this implementation, the generation + * of this access width must be deferred until the region length has + * been evaluated. + * + ******************************************************************************/ + +static u32 +acpi_ex_generate_access(u32 field_bit_offset, + u32 field_bit_length, u32 region_length) +{ + u32 field_byte_length; + u32 field_byte_offset; + u32 field_byte_end_offset; + u32 access_byte_width; + u32 field_start_offset; + u32 field_end_offset; + u32 minimum_access_width = 0xFFFFFFFF; + u32 minimum_accesses = 0xFFFFFFFF; + u32 accesses; + + ACPI_FUNCTION_TRACE(ex_generate_access); + + /* Round Field start offset and length to "minimal" byte boundaries */ + + field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8)); + + field_byte_end_offset = + ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length + field_bit_offset, 8)); + + field_byte_length = field_byte_end_offset - field_byte_offset; + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Bit length %u, Bit offset %u\n", + field_bit_length, field_bit_offset)); + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Byte Length %u, Byte Offset %u, End Offset %u\n", + field_byte_length, field_byte_offset, + field_byte_end_offset)); + + /* + * Iterative search for the maximum access width that is both aligned + * and does not go beyond the end of the region + * + * Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes) + */ + for (access_byte_width = 1; access_byte_width <= 8; + access_byte_width <<= 1) { + /* + * 1) Round end offset up to next access boundary and make sure that + * this does not go beyond the end of the parent region. + * 2) When the Access width is greater than the field_byte_length, we + * are done. (This does not optimize for the perfectly aligned + * case yet). + */ + if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <= + region_length) { + field_start_offset = + ACPI_ROUND_DOWN(field_byte_offset, + access_byte_width) / + access_byte_width; + + field_end_offset = + ACPI_ROUND_UP((field_byte_length + + field_byte_offset), + access_byte_width) / + access_byte_width; + + accesses = field_end_offset - field_start_offset; + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "AccessWidth %u end is within region\n", + access_byte_width)); + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Field Start %u, Field End %u -- requires %u accesses\n", + field_start_offset, field_end_offset, + accesses)); + + /* Single access is optimal */ + + if (accesses <= 1) { + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Entire field can be accessed " + "with one operation of size %u\n", + access_byte_width)); + return_VALUE(access_byte_width); + } + + /* + * Fits in the region, but requires more than one read/write. + * try the next wider access on next iteration + */ + if (accesses < minimum_accesses) { + minimum_accesses = accesses; + minimum_access_width = access_byte_width; + } + } else { + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "AccessWidth %u end is NOT within region\n", + access_byte_width)); + if (access_byte_width == 1) { + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Field goes beyond end-of-region!\n")); + + /* Field does not fit in the region at all */ + + return_VALUE(0); + } + + /* + * This width goes beyond the end-of-region, back off to + * previous access + */ + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Backing off to previous optimal access width of %u\n", + minimum_access_width)); + return_VALUE(minimum_access_width); + } + } + + /* + * Could not read/write field with one operation, + * just use max access width + */ + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Cannot access field in one operation, using width 8\n")); + + return_VALUE(8); +} +#endif /* ACPI_UNDER_DEVELOPMENT */ + +/******************************************************************************* + * + * FUNCTION: acpi_ex_decode_field_access + * + * PARAMETERS: obj_desc - Field object + * field_flags - Encoded fieldflags (contains access bits) + * return_byte_alignment - Where the byte alignment is returned + * + * RETURN: Field granularity (8, 16, 32 or 64) and + * byte_alignment (1, 2, 3, or 4) + * + * DESCRIPTION: Decode the access_type bits of a field definition. + * + ******************************************************************************/ + +static u32 +acpi_ex_decode_field_access(union acpi_operand_object *obj_desc, + u8 field_flags, u32 * return_byte_alignment) +{ + u32 access; + u32 byte_alignment; + u32 bit_length; + + ACPI_FUNCTION_TRACE(ex_decode_field_access); + + access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK); + + switch (access) { + case AML_FIELD_ACCESS_ANY: + +#ifdef ACPI_UNDER_DEVELOPMENT + byte_alignment = + acpi_ex_generate_access(obj_desc->common_field. + start_field_bit_offset, + obj_desc->common_field.bit_length, + 0xFFFFFFFF + /* Temp until we pass region_length as parameter */ + ); + bit_length = byte_alignment * 8; +#endif + + byte_alignment = 1; + bit_length = 8; + break; + + case AML_FIELD_ACCESS_BYTE: + case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */ + + byte_alignment = 1; + bit_length = 8; + break; + + case AML_FIELD_ACCESS_WORD: + + byte_alignment = 2; + bit_length = 16; + break; + + case AML_FIELD_ACCESS_DWORD: + + byte_alignment = 4; + bit_length = 32; + break; + + case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */ + + byte_alignment = 8; + bit_length = 64; + break; + + default: + + /* Invalid field access type */ + + ACPI_ERROR((AE_INFO, "Unknown field access type 0x%X", access)); + + return_UINT32(0); + } + + if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { + /* + * buffer_field access can be on any byte boundary, so the + * byte_alignment is always 1 byte -- regardless of any byte_alignment + * implied by the field access type. + */ + byte_alignment = 1; + } + + *return_byte_alignment = byte_alignment; + return_UINT32(bit_length); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_prep_common_field_object + * + * PARAMETERS: obj_desc - The field object + * field_flags - Access, lock_rule, and update_rule. + * The format of a field_flag is described + * in the ACPI specification + * field_attribute - Special attributes (not used) + * field_bit_position - Field start position + * field_bit_length - Field length in number of bits + * + * RETURN: Status + * + * DESCRIPTION: Initialize the areas of the field object that are common + * to the various types of fields. Note: This is very "sensitive" + * code because we are solving the general case for field + * alignment. + * + ******************************************************************************/ + +acpi_status +acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc, + u8 field_flags, + u8 field_attribute, + u32 field_bit_position, u32 field_bit_length) +{ + u32 access_bit_width; + u32 byte_alignment; + u32 nearest_byte_address; + + ACPI_FUNCTION_TRACE(ex_prep_common_field_object); + + /* + * Note: the structure being initialized is the + * ACPI_COMMON_FIELD_INFO; No structure fields outside of the common + * area are initialized by this procedure. + */ + obj_desc->common_field.field_flags = field_flags; + obj_desc->common_field.attribute = field_attribute; + obj_desc->common_field.bit_length = field_bit_length; + + /* + * Decode the access type so we can compute offsets. The access type gives + * two pieces of information - the width of each field access and the + * necessary byte_alignment (address granularity) of the access. + * + * For any_acc, the access_bit_width is the largest width that is both + * necessary and possible in an attempt to access the whole field in one + * I/O operation. However, for any_acc, the byte_alignment is always one + * byte. + * + * For all Buffer Fields, the byte_alignment is always one byte. + * + * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is + * the same (equivalent) as the byte_alignment. + */ + access_bit_width = + acpi_ex_decode_field_access(obj_desc, field_flags, &byte_alignment); + if (!access_bit_width) { + return_ACPI_STATUS(AE_AML_OPERAND_VALUE); + } + + /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */ + + obj_desc->common_field.access_byte_width = (u8) + ACPI_DIV_8(access_bit_width); + + /* + * base_byte_offset is the address of the start of the field within the + * region. It is the byte address of the first *datum* (field-width data + * unit) of the field. (i.e., the first datum that contains at least the + * first *bit* of the field.) + * + * Note: byte_alignment is always either equal to the access_bit_width or 8 + * (Byte access), and it defines the addressing granularity of the parent + * region or buffer. + */ + nearest_byte_address = + ACPI_ROUND_BITS_DOWN_TO_BYTES(field_bit_position); + obj_desc->common_field.base_byte_offset = (u32) + ACPI_ROUND_DOWN(nearest_byte_address, byte_alignment); + + /* + * start_field_bit_offset is the offset of the first bit of the field within + * a field datum. + */ + obj_desc->common_field.start_field_bit_offset = (u8) + (field_bit_position - + ACPI_MUL_8(obj_desc->common_field.base_byte_offset)); + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_prep_field_value + * + * PARAMETERS: info - Contains all field creation info + * + * RETURN: Status + * + * DESCRIPTION: Construct an object of type union acpi_operand_object with a + * subtype of def_field and connect it to the parent Node. + * + ******************************************************************************/ + +acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info) +{ + union acpi_operand_object *obj_desc; + union acpi_operand_object *second_desc = NULL; + acpi_status status; + u32 access_byte_width; + u32 type; + + ACPI_FUNCTION_TRACE(ex_prep_field_value); + + /* Parameter validation */ + + if (info->field_type != ACPI_TYPE_LOCAL_INDEX_FIELD) { + if (!info->region_node) { + ACPI_ERROR((AE_INFO, "Null RegionNode")); + return_ACPI_STATUS(AE_AML_NO_OPERAND); + } + + type = acpi_ns_get_type(info->region_node); + if (type != ACPI_TYPE_REGION) { + ACPI_ERROR((AE_INFO, + "Needed Region, found type 0x%X (%s)", type, + acpi_ut_get_type_name(type))); + + return_ACPI_STATUS(AE_AML_OPERAND_TYPE); + } + } + + /* Allocate a new field object */ + + obj_desc = acpi_ut_create_internal_object(info->field_type); + if (!obj_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Initialize areas of the object that are common to all fields */ + + obj_desc->common_field.node = info->field_node; + status = acpi_ex_prep_common_field_object(obj_desc, + info->field_flags, + info->attribute, + info->field_bit_position, + info->field_bit_length); + if (ACPI_FAILURE(status)) { + acpi_ut_delete_object_desc(obj_desc); + return_ACPI_STATUS(status); + } + + /* Initialize areas of the object that are specific to the field type */ + + switch (info->field_type) { + case ACPI_TYPE_LOCAL_REGION_FIELD: + + obj_desc->field.region_obj = + acpi_ns_get_attached_object(info->region_node); + + /* Fields specific to generic_serial_bus fields */ + + obj_desc->field.access_length = info->access_length; + + if (info->connection_node) { + second_desc = info->connection_node->object; + if (!(second_desc->common.flags & AOPOBJ_DATA_VALID)) { + status = + acpi_ds_get_buffer_arguments(second_desc); + if (ACPI_FAILURE(status)) { + acpi_ut_delete_object_desc(obj_desc); + return_ACPI_STATUS(status); + } + } + + obj_desc->field.resource_buffer = + second_desc->buffer.pointer; + obj_desc->field.resource_length = + (u16)second_desc->buffer.length; + } else if (info->resource_buffer) { + obj_desc->field.resource_buffer = info->resource_buffer; + obj_desc->field.resource_length = info->resource_length; + } + + obj_desc->field.pin_number_index = info->pin_number_index; + + /* Allow full data read from EC address space */ + + if ((obj_desc->field.region_obj->region.space_id == + ACPI_ADR_SPACE_EC) + && (obj_desc->common_field.bit_length > 8)) { + access_byte_width = + ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field. + bit_length); + + /* Maximum byte width supported is 255 */ + + if (access_byte_width < 256) { + obj_desc->common_field.access_byte_width = + (u8)access_byte_width; + } + } + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n", + obj_desc->field.start_field_bit_offset, + obj_desc->field.base_byte_offset, + obj_desc->field.access_byte_width, + obj_desc->field.region_obj)); + break; + + case ACPI_TYPE_LOCAL_BANK_FIELD: + + obj_desc->bank_field.value = info->bank_value; + obj_desc->bank_field.region_obj = + acpi_ns_get_attached_object(info->region_node); + obj_desc->bank_field.bank_obj = + acpi_ns_get_attached_object(info->register_node); + + /* An additional reference for the attached objects */ + + acpi_ut_add_reference(obj_desc->bank_field.region_obj); + acpi_ut_add_reference(obj_desc->bank_field.bank_obj); + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n", + obj_desc->bank_field.start_field_bit_offset, + obj_desc->bank_field.base_byte_offset, + obj_desc->field.access_byte_width, + obj_desc->bank_field.region_obj, + obj_desc->bank_field.bank_obj)); + + /* + * Remember location in AML stream of the field unit + * opcode and operands -- since the bank_value + * operands must be evaluated. + */ + second_desc = obj_desc->common.next_object; + second_desc->extra.aml_start = + ACPI_CAST_PTR(union acpi_parse_object, + info->data_register_node)->named.data; + second_desc->extra.aml_length = + ACPI_CAST_PTR(union acpi_parse_object, + info->data_register_node)->named.length; + + break; + + case ACPI_TYPE_LOCAL_INDEX_FIELD: + + /* Get the Index and Data registers */ + + obj_desc->index_field.index_obj = + acpi_ns_get_attached_object(info->register_node); + obj_desc->index_field.data_obj = + acpi_ns_get_attached_object(info->data_register_node); + + if (!obj_desc->index_field.data_obj + || !obj_desc->index_field.index_obj) { + ACPI_ERROR((AE_INFO, + "Null Index Object during field prep")); + acpi_ut_delete_object_desc(obj_desc); + return_ACPI_STATUS(AE_AML_INTERNAL); + } + + /* An additional reference for the attached objects */ + + acpi_ut_add_reference(obj_desc->index_field.data_obj); + acpi_ut_add_reference(obj_desc->index_field.index_obj); + + /* + * April 2006: Changed to match MS behavior + * + * The value written to the Index register is the byte offset of the + * target field in units of the granularity of the index_field + * + * Previously, the value was calculated as an index in terms of the + * width of the Data register, as below: + * + * obj_desc->index_field.Value = (u32) + * (Info->field_bit_position / ACPI_MUL_8 ( + * obj_desc->Field.access_byte_width)); + * + * February 2006: Tried value as a byte offset: + * obj_desc->index_field.Value = (u32) + * ACPI_DIV_8 (Info->field_bit_position); + */ + obj_desc->index_field.value = + (u32) ACPI_ROUND_DOWN(ACPI_DIV_8(info->field_bit_position), + obj_desc->index_field. + access_byte_width); + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "IndexField: BitOff %X, Off %X, Value %X, " + "Gran %X, Index %p, Data %p\n", + obj_desc->index_field.start_field_bit_offset, + obj_desc->index_field.base_byte_offset, + obj_desc->index_field.value, + obj_desc->field.access_byte_width, + obj_desc->index_field.index_obj, + obj_desc->index_field.data_obj)); + break; + + default: + + /* No other types should get here */ + + break; + } + + /* + * Store the constructed descriptor (obj_desc) into the parent Node, + * preserving the current type of that named_obj. + */ + status = + acpi_ns_attach_object(info->field_node, obj_desc, + acpi_ns_get_type(info->field_node)); + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "Set NamedObj %p [%4.4s], ObjDesc %p\n", + info->field_node, + acpi_ut_get_node_name(info->field_node), obj_desc)); + + /* Remove local reference to the object */ + + acpi_ut_remove_reference(obj_desc); + return_ACPI_STATUS(status); +} |