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/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
/*
* Userspace interface for AMD Dynamic Boost Control (DBC)
*
* Copyright (C) 2023 Advanced Micro Devices, Inc.
*
* Author: Mario Limonciello <mario.limonciello@amd.com>
*/
#ifndef __PSP_DBC_USER_H__
#define __PSP_DBC_USER_H__
#include <linux/types.h>
/**
* DOC: AMD Dynamic Boost Control (DBC) interface
*/
#define DBC_NONCE_SIZE 16
#define DBC_SIG_SIZE 32
#define DBC_UID_SIZE 16
/**
* struct dbc_user_nonce - Nonce exchange structure (input/output).
* @auth_needed: Whether the PSP should authenticate this request (input).
* 0: no authentication, PSP will return single use nonce.
* 1: authentication: PSP will return multi-use nonce.
* @nonce: 8 byte value used for future authentication (output).
* @signature: Optional 32 byte signature created by software using a
* previous nonce (input).
*/
struct dbc_user_nonce {
__u32 auth_needed;
__u8 nonce[DBC_NONCE_SIZE];
__u8 signature[DBC_SIG_SIZE];
} __packed;
/**
* struct dbc_user_setuid - UID exchange structure (input).
* @uid: 16 byte value representing software identity
* @signature: 32 byte signature created by software using a previous nonce
*/
struct dbc_user_setuid {
__u8 uid[DBC_UID_SIZE];
__u8 signature[DBC_SIG_SIZE];
} __packed;
/**
* Dynamic Boost Control (DBC) IOC
*
* possible return codes for all DBC IOCTLs:
* 0: success
* -EINVAL: invalid input
* -E2BIG: excess data passed
* -EFAULT: failed to copy to/from userspace
* -EBUSY: mailbox in recovery or in use
* -ENODEV: driver not bound with PSP device
* -EACCES: request isn't authorized
* -EINVAL: invalid parameter
* -ETIMEDOUT: request timed out
* -EAGAIN: invalid request for state machine
* -ENOENT: not implemented
* -ENFILE: overflow
* -EPERM: invalid signature
* -EIO: unknown error
*/
#define DBC_IOC_TYPE 'D'
/**
* DBCIOCNONCE - Fetch a nonce from the PSP for authenticating commands.
* If a nonce is fetched without authentication it can only
* be utilized for one command.
* If a nonce is fetched with authentication it can be used
* for multiple requests.
*/
#define DBCIOCNONCE _IOWR(DBC_IOC_TYPE, 0x1, struct dbc_user_nonce)
/**
* DBCIOCUID - Set the user ID (UID) of a calling process.
* The user ID is 8 bytes long. It must be programmed using a
* 32 byte signature built using the nonce fetched from
* DBCIOCNONCE.
* The UID can only be set once until the system is rebooted.
*/
#define DBCIOCUID _IOW(DBC_IOC_TYPE, 0x2, struct dbc_user_setuid)
#endif /* __PSP_DBC_USER_H__ */
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