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psp-dbc.h
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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]; } __attribute__((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]; } __attribute__((packed)); /** * struct dbc_user_param - Parameter exchange structure (input/output). * @msg_index: Message indicating what parameter to set or get (input) * @param: 4 byte parameter, units are message specific. (input/output) * @signature: 32 byte signature. * - When sending a message this is to be created by software * using a previous nonce (input) * - For interpreting results, this signature is updated by the * PSP to allow software to validate the authenticity of the * results. */ struct dbc_user_param { __u32 msg_index; __u32 param; __u8 signature[DBC_SIG_SIZE]; } __attribute__((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) /** * DBCIOCPARAM - Set or get a parameter from the PSP. * This request will only work after DBCIOCUID has successfully * set the UID of the calling process. * Whether the parameter is set or get is controlled by the * message ID in the request. * This command must be sent using a 32 byte signature built * using the nonce fetched from DBCIOCNONCE. * When the command succeeds, the 32 byte signature will be * updated by the PSP for software to authenticate the results. */ #define DBCIOCPARAM _IOWR(DBC_IOC_TYPE, 0x3, struct dbc_user_param) /** * enum dbc_cmd_msg - Messages utilized by DBCIOCPARAM * @PARAM_GET_FMAX_CAP: Get frequency cap (MHz) * @PARAM_SET_FMAX_CAP: Set frequency cap (MHz) * @PARAM_GET_PWR_CAP: Get socket power cap (mW) * @PARAM_SET_PWR_CAP: Set socket power cap (mW) * @PARAM_GET_GFX_MODE: Get graphics mode (0/1) * @PARAM_SET_GFX_MODE: Set graphics mode (0/1) * @PARAM_GET_CURR_TEMP: Get current temperature (degrees C) * @PARAM_GET_FMAX_MAX: Get maximum allowed value for frequency (MHz) * @PARAM_GET_FMAX_MIN: Get minimum allowed value for frequency (MHz) * @PARAM_GET_SOC_PWR_MAX: Get maximum allowed value for SoC power (mw) * @PARAM_GET_SOC_PWR_MIN: Get minimum allowed value for SoC power (mw) * @PARAM_GET_SOC_PWR_CUR: Get current value for SoC Power (mW) */ enum dbc_cmd_msg { PARAM_GET_FMAX_CAP = 0x3, PARAM_SET_FMAX_CAP = 0x4, PARAM_GET_PWR_CAP = 0x5, PARAM_SET_PWR_CAP = 0x6, PARAM_GET_GFX_MODE = 0x7, PARAM_SET_GFX_MODE = 0x8, PARAM_GET_CURR_TEMP = 0x9, PARAM_GET_FMAX_MAX = 0xA, PARAM_GET_FMAX_MIN = 0xB, PARAM_GET_SOC_PWR_MAX = 0xC, PARAM_GET_SOC_PWR_MIN = 0xD, PARAM_GET_SOC_PWR_CUR = 0xE, }; #endif /* __PSP_DBC_USER_H__ */