/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
/*
 * Userspace interface for AMD Seamless Firmware Servicing (SFS)
 *
 * Copyright (C) 2025 Advanced Micro Devices, Inc.
 *
 * Author: Ashish Kalra <ashish.kalra@amd.com>
 */

#ifndef __PSP_SFS_USER_H__
#define __PSP_SFS_USER_H__

#include <linux/types.h>

/**
 * SFS: AMD Seamless Firmware Support (SFS) interface
 */

#define PAYLOAD_NAME_SIZE	64
#define TEE_EXT_CMD_BUFFER_SIZE	4096

/**
 * struct sfs_user_get_fw_versions - get current level of base firmware (output).
 * @blob:                  current level of base firmware for ASP and patch levels (input/output).
 * @sfs_status:            32-bit SFS status value (output).
 * @sfs_extended_status:   32-bit SFS extended status value (output).
 */
struct sfs_user_get_fw_versions {
	__u8	blob[TEE_EXT_CMD_BUFFER_SIZE];
	__u32	sfs_status;
	__u32	sfs_extended_status;
} __attribute__((packed));

/**
 * struct sfs_user_update_package - update SFS package (input).
 * @payload_name:          name of SFS package to load, verify and execute (input).
 * @sfs_status:            32-bit SFS status value (output).
 * @sfs_extended_status:   32-bit SFS extended status value (output).
 */
struct sfs_user_update_package {
	char	payload_name[PAYLOAD_NAME_SIZE];
	__u32	sfs_status;
	__u32	sfs_extended_status;
} __attribute__((packed));

/**
 * Seamless Firmware Support (SFS) IOC
 *
 * possible return codes for all SFS 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:       PSP I/O error
 */
#define SFS_IOC_TYPE	'S'

/**
 * SFSIOCFWVERS - returns blob containing FW versions
 *                ASP provides the current level of Base Firmware for the ASP
 *                and the other microprocessors as well as current patch
 *                level(s).
 */
#define SFSIOCFWVERS	_IOWR(SFS_IOC_TYPE, 0x1, struct sfs_user_get_fw_versions)

/**
 * SFSIOCUPDATEPKG - updates package/payload
 *                   ASP loads, verifies and executes the SFS package.
 *                   By default, the SFS package/payload is loaded from
 *                   /lib/firmware/amd, but alternative firmware loading
 *                   path can be specified using kernel parameter
 *                   firmware_class.path or the firmware loading path
 *                   can be customized using sysfs file:
 *                   /sys/module/firmware_class/parameters/path.
 */
#define SFSIOCUPDATEPKG	_IOWR(SFS_IOC_TYPE, 0x2, struct sfs_user_update_package)

#endif /* __PSP_SFS_USER_H__ */