1 /* SPDX-License-Identifier: BSD-3-Clause */ 2 /* 3 * Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved. 4 * Copyright (c) 2019, Linaro Limited 5 */ 6 #ifndef SCMI_MSG_COMMON_H 7 #define SCMI_MSG_COMMON_H 8 9 #include <assert.h> 10 #include <stdbool.h> 11 #include <stdint.h> 12 #include <string.h> 13 #include <types_ext.h> 14 15 #define SCMI_VERSION 0x30000 16 #define SCMI_IMPL_VERSION 0 17 18 /* 19 * Secure copy of input payload: we expect small messages, at most the legacy 20 * SMT messages that are 128 bytes (Linux kernel) including SMT header. 21 */ 22 #define SCMI_SEC_PAYLOAD_SIZE 92 23 24 /* 25 * Copy name identifier in target buffer following the SCMI specification 26 * that state name identifier shall be a null terminated string. 27 */ 28 #define COPY_NAME_IDENTIFIER(_dst_array, _name) \ 29 do { \ 30 assert(strlen(_name) < sizeof(_dst_array)); \ 31 strncpy((_dst_array), (_name), sizeof(_dst_array)); \ 32 } while (0) 33 34 /* Common command identifiers shared by all procotols */ 35 enum scmi_common_message_id { 36 SCMI_PROTOCOL_VERSION = 0x000, 37 SCMI_PROTOCOL_ATTRIBUTES = 0x001, 38 SCMI_PROTOCOL_MESSAGE_ATTRIBUTES = 0x002 39 }; 40 41 /* Common platform-to-agent (p2a) PROTOCOL_VERSION structure */ 42 struct scmi_protocol_version_p2a { 43 int32_t status; 44 uint32_t version; 45 }; 46 47 /* Generic platform-to-agent (p2a) PROTOCOL_ATTRIBUTES structure */ 48 struct scmi_protocol_attributes_p2a { 49 int32_t status; 50 uint32_t attributes; 51 }; 52 53 /* Generic agent-to-platform (a2p) PROTOCOL_MESSAGE_ATTRIBUTES structure */ 54 struct scmi_protocol_message_attributes_a2p { 55 uint32_t message_id; 56 }; 57 58 /* Generic platform-to-agent (p2a) PROTOCOL_MESSAGE_ATTRIBUTES structure */ 59 struct scmi_protocol_message_attributes_p2a { 60 int32_t status; 61 uint32_t attributes; 62 }; 63 64 /* 65 * struct scmi_msg - SCMI message context 66 * 67 * @channel_id: SCMI channel ID, safely set from secure world 68 * @protocol_id: SCMI protocol ID for the related message, set by caller agent 69 * @message_id: SCMI message ID for the related message, set by caller agent 70 * @in: Address of the incoming message payload copied in secure memory 71 * @in_size: Byte length of the incoming message payload, set by caller agent 72 * @out: Address of of the output message payload message in non-secure memory 73 * @out_size: Byte length of the provisionned output buffer 74 * @out_size_out: Byte length of the output message payload 75 */ 76 struct scmi_msg { 77 unsigned int channel_id; 78 unsigned int protocol_id; 79 unsigned int message_id; 80 char *in; 81 size_t in_size; 82 char *out; 83 size_t out_size; 84 size_t out_size_out; 85 }; 86 87 /* 88 * Type scmi_msg_handler_t is used by procotol drivers to safely find 89 * the handler function for the incoming message ID. 90 */ 91 typedef void (*scmi_msg_handler_t)(struct scmi_msg *msg); 92 93 /* 94 * Process Read, process and write response for input SCMI message 95 * 96 * @msg: SCMI message context 97 */ 98 void scmi_process_message(struct scmi_msg *msg); 99 100 /* 101 * Write SCMI response payload to output message shared memory 102 * 103 * @msg: SCMI message context 104 * @payload: Output message payload 105 * @size: Byte size of output message payload 106 */ 107 void scmi_write_response(struct scmi_msg *msg, void *payload, size_t size); 108 109 /* 110 * Write status only SCMI response payload to output message shared memory 111 * 112 * @msg: SCMI message context 113 * @status: SCMI status value returned to caller 114 */ 115 void scmi_status_response(struct scmi_msg *msg, int32_t status); 116 117 /* 118 * Claim access to channel 119 * @channel: SCMI channel reference 120 * Return true upon success or false if the channel is already busy 121 */ 122 bool scmi_msg_claim_channel(struct scmi_msg_channel *channel); 123 124 /* 125 * Release access channel 126 * @channel: SCMI channel reference 127 */ 128 void scmi_msg_release_channel(struct scmi_msg_channel *channel); 129 130 /* 131 * Entry for processing a channel using SMT shared memory protocol 132 * @channel_id: SCMI channel identifier provided by client 133 * @payload_buf: Secure buffer where to copy input message 134 */ 135 void scmi_entry_smt(unsigned int channel_id, uint32_t *payload_buf); 136 137 /* 138 * Entry for processing a channel using SMT shared memory protocol 139 * 140 * @channel_id: SCMI channel identifier provided by client 141 * @in_buf: Shared buffer storing input SCMI message 142 * @in_size: Byte size of @in_buf, including MSG header and message payload 143 * @out_buf: Shared buffer storing input SCMI message 144 * @out_size: [in] @out_buf max byte size 145 * [out] @out_buf output byte size (MSG header and message payload) 146 * @sec_buf: Secure buffer where to copy input message 147 */ 148 TEE_Result scmi_entry_msg(unsigned int channel_id, void *in_buf, size_t in_size, 149 void *out_buf, size_t *out_size, uint32_t *sec_buf); 150 #endif /* SCMI_MSG_COMMON_H */ 151