mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 05:42:46 +01:00
Alexander Usyskin
65f0ecb9ec
The ISSEI (Intel Silicon Security Engine Interface) subsystem provides a communication channel between the host and the Silicon Security Engine. Prepare basic driver functions and character device for user-space communication. Add DMA access routines for ISSEI HECI devices. Add of DMA-related structures and implementation of routines for setting up DMA, as well as reading and writing DMA buffers. Reviewed-by: Karol Wachowski <[email protected]> Co-developed-by: Vitaly Lubart <[email protected]> Signed-off-by: Vitaly Lubart <[email protected]> Signed-off-by: Alexander Usyskin <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Copyright (C) 2023-2026 Intel Corporation
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* Intel Silicon Security Engine Interface (ISSEI) Linux driver:
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* ISSEI Interface Header
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*/
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#ifndef _LINUX_ISSEI_H
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#define _LINUX_ISSEI_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/*
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* This ioctl is used to associate the current file descriptor with a
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* FW Client (given by UUID). This opens a communication channel
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* between a host client and a FW client. From this point every read and write
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* will communicate with the associated FW client.
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* The communication between the clients can be terminated by
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* IOCTL_ISSEI_DISCONNECT_CLIENT IOCTL or by
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* closing the file descriptor (file_operation release()).
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*
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* The ioctl argument is a struct with a union that contains
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* the input parameter and the output parameter for this ioctl.
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*
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* The input parameter is UUID of the FW Client.
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* The output parameter is the properties of the FW client
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* (FW protocol version, max message size and client flags).
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*/
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#define IOCTL_ISSEI_CONNECT_CLIENT \
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_IOWR('H', 0x01, struct issei_connect_client_data)
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/**
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* struct issei_client - ISSEI client information structure
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* @max_msg_length: maximum message length supported by the firmware client (in bytes)
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* @protocol_version: protocol version reported by the firmware client
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* @reserved1: reserved
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* @flags: flag bitmask reported by the firmware client
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* @reserved2: reserved
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*/
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struct issei_client {
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__u32 max_msg_length;
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__u8 protocol_version;
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__u8 reserved1[3];
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__u32 flags;
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__u32 reserved2;
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};
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#define ISSEI_IOCTL_UUID_LEN 16
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/**
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* struct issei_connect_client_data - ioctl Connect Client Data structure
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* @in_client_uuid: unique id of the firmware client to connect to (from user space to kernel)
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* @out_client_properties: connected firmware client properties (from kernel to user space)
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*/
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struct issei_connect_client_data {
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union {
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__u8 in_client_uuid[ISSEI_IOCTL_UUID_LEN];
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struct issei_client out_client_properties;
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};
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};
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/*
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* This ioctl is used to terminate association between
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* the host client and the FW client.
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*/
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#define IOCTL_ISSEI_DISCONNECT_CLIENT \
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_IO('H', 0x02)
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#endif /* _LINUX_ISSEI_H */
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