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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright (C) 2023-2026 Intel Corporation
* Intel Silicon Security Engine Interface (ISSEI) Linux driver:
* ISSEI Interface Header
*/
#ifndef _LINUX_ISSEI_H
#define _LINUX_ISSEI_H
#include <linux/ioctl.h>
#include <linux/types.h>
/*
* This ioctl is used to associate the current file descriptor with a
* FW Client (given by UUID). This opens a communication channel
* between a host client and a FW client. From this point every read and write
* will communicate with the associated FW client.
* The communication between the clients can be terminated by
* IOCTL_ISSEI_DISCONNECT_CLIENT IOCTL or by
* closing the file descriptor (file_operation release()).
*
* The ioctl argument is a struct with a union that contains
* the input parameter and the output parameter for this ioctl.
*
* The input parameter is UUID of the FW Client.
* The output parameter is the properties of the FW client
* (FW protocol version, max message size and client flags).
*/
#define IOCTL_ISSEI_CONNECT_CLIENT \
_IOWR('H', 0x01, struct issei_connect_client_data)
/**
* struct issei_client - ISSEI client information structure
* @max_msg_length: maximum message length supported by the firmware client (in bytes)
* @protocol_version: protocol version reported by the firmware client
* @reserved1: reserved
* @flags: flag bitmask reported by the firmware client
* @reserved2: reserved
*/
struct issei_client {
__u32 max_msg_length;
__u8 protocol_version;
__u8 reserved1[3];
__u32 flags;
__u32 reserved2;
};
#define ISSEI_IOCTL_UUID_LEN 16
/**
* struct issei_connect_client_data - ioctl Connect Client Data structure
* @in_client_uuid: unique id of the firmware client to connect to (from user space to kernel)
* @out_client_properties: connected firmware client properties (from kernel to user space)
*/
struct issei_connect_client_data {
union {
__u8 in_client_uuid[ISSEI_IOCTL_UUID_LEN];
struct issei_client out_client_properties;
};
};
/*
* This ioctl is used to terminate association between
* the host client and the FW client.
*/
#define IOCTL_ISSEI_DISCONNECT_CLIENT \
_IO('H', 0x02)
#endif /* _LINUX_ISSEI_H */
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