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 */ | ||