cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/exfield.c

/******************************************************************************
 *
 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, 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); }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng84100.00%2100.00%
Total84100.00%2100.00%

/******************************************************************************* * * 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; } if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && (obj_desc->field.region_obj->region.space_id == ACPI_ADR_SPACE_GPIO)) { /* * For GPIO (general_purpose_io), the Address will be the bit offset * from the previous Connection() operator, making it effectively a * pin number index. The bit_length is the length of the field, which * is thus the number of pins. */ ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "GPIO FieldRead [FROM]: Pin %u Bits %u\n", obj_desc->field.pin_number_index, obj_desc->field.bit_length)); /* Lock entire transaction if requested */ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); /* Perform the write */ status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ); acpi_ex_release_global_lock(obj_desc->common_field.field_flags); if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(buffer_desc); } else { *ret_buffer_desc = buffer_desc; } return_ACPI_STATUS(status); } 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore20631.31%1043.48%
Andy Grover19529.64%939.13%
Linus Torvalds16725.38%28.70%
Lin Ming649.73%14.35%
Lv Zheng263.95%14.35%
Total658100.00%23100.00%

/******************************************************************************* * * 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; 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); } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && (obj_desc->field.region_obj->region.space_id == ACPI_ADR_SPACE_GPIO)) { /* * For GPIO (general_purpose_io), we will bypass the entire field * mechanism and handoff the bit address and bit width directly to * the handler. The Address will be the bit offset * from the previous Connection() operator, making it effectively a * pin number index. The bit_length is the length of the field, which * is thus the number of pins. */ if (source_desc->common.type != ACPI_TYPE_INTEGER) { return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "GPIO FieldWrite [FROM]: (%s:%X), Val %.8X [TO]: Pin %u Bits %u\n", acpi_ut_get_type_name(source_desc->common. type), source_desc->common.type, (u32)source_desc->integer.value, obj_desc->field.pin_number_index, obj_desc->field.bit_length)); buffer = &source_desc->integer.value; /* Lock entire transaction if requested */ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); /* Perform the write */ status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE); acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore24832.80%1047.62%
Andy Grover22129.23%628.57%
Linus Torvalds17723.41%29.52%
Lin Ming688.99%14.76%
Lv Zheng263.44%14.76%
Len Brown162.12%14.76%
Total756100.00%21100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore45929.84%1546.88%
Andy Grover41827.18%928.12%
Linus Torvalds35723.21%26.25%
Lv Zheng1529.88%26.25%
Lin Ming1328.58%13.12%
Len Brown191.24%26.25%
Patrick Mochel10.07%13.12%
Total1538100.00%32100.00%
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