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.
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| 1 | +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | |
| 2 | +/* | |
| 3 | + * Copyright (C) 2023-2026 Intel Corporation | |
| 4 | + * Intel Silicon Security Engine Interface (ISSEI) Linux driver: | |
| 5 | + * ISSEI Interface Header | |
| 6 | + */ | |
| 7 | +#ifndef _LINUX_ISSEI_H | |
| 8 | +#define _LINUX_ISSEI_H | |
| 9 | + | |
| 10 | +#include <linux/ioctl.h> | |
| 11 | +#include <linux/types.h> | |
| 12 | + | |
| 13 | +/* | |
| 14 | + * This ioctl is used to associate the current file descriptor with a | |
| 15 | + * FW Client (given by UUID). This opens a communication channel | |
| 16 | + * between a host client and a FW client. From this point every read and write | |
| 17 | + * will communicate with the associated FW client. | |
| 18 | + * The communication between the clients can be terminated by | |
| 19 | + * IOCTL_ISSEI_DISCONNECT_CLIENT IOCTL or by | |
| 20 | + * closing the file descriptor (file_operation release()). | |
| 21 | + * | |
| 22 | + * The ioctl argument is a struct with a union that contains | |
| 23 | + * the input parameter and the output parameter for this ioctl. | |
| 24 | + * | |
| 25 | + * The input parameter is UUID of the FW Client. | |
| 26 | + * The output parameter is the properties of the FW client | |
| 27 | + * (FW protocol version, max message size and client flags). | |
| 28 | + */ | |
| 29 | +#define IOCTL_ISSEI_CONNECT_CLIENT \ | |
| 30 | + _IOWR('H', 0x01, struct issei_connect_client_data) | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * struct issei_client - ISSEI client information structure | |
| 34 | + * @max_msg_length: maximum message length supported by the firmware client (in bytes) | |
| 35 | + * @protocol_version: protocol version reported by the firmware client | |
| 36 | + * @reserved1: reserved | |
| 37 | + * @flags: flag bitmask reported by the firmware client | |
| 38 | + * @reserved2: reserved | |
| 39 | + */ | |
| 40 | +struct issei_client { | |
| 41 | + __u32 max_msg_length; | |
| 42 | + __u8 protocol_version; | |
| 43 | + __u8 reserved1[3]; | |
| 44 | + __u32 flags; | |
| 45 | + __u32 reserved2; | |
| 46 | +}; | |
| 47 | + | |
| 48 | +#define ISSEI_IOCTL_UUID_LEN 16 | |
| 49 | + | |
| 50 | +/** | |
| 51 | + * struct issei_connect_client_data - ioctl Connect Client Data structure | |
| 52 | + * @in_client_uuid: unique id of the firmware client to connect to (from user space to kernel) | |
| 53 | + * @out_client_properties: connected firmware client properties (from kernel to user space) | |
| 54 | + */ | |
| 55 | +struct issei_connect_client_data { | |
| 56 | + union { | |
| 57 | + __u8 in_client_uuid[ISSEI_IOCTL_UUID_LEN]; | |
| 58 | + struct issei_client out_client_properties; | |
| 59 | + }; | |
| 60 | +}; | |
| 61 | + | |
| 62 | +/* | |
| 63 | + * This ioctl is used to terminate association between | |
| 64 | + * the host client and the FW client. | |
| 65 | + */ | |
| 66 | +#define IOCTL_ISSEI_DISCONNECT_CLIENT \ | |
| 67 | + _IO('H', 0x02) | |
| 68 | + | |
| 69 | +#endif /* _LINUX_ISSEI_H */ | |