82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* inspector-atf: cpuinspect inspector for EFI-based systems
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*
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* Copyright (c) Huawei Technologies Co., Ltd. 2022-2023. All rights reserved.
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*
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* Author: Yu Liao <liaoyu15@huawei.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/cpuinspect.h>
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#include <linux/arm-smccc.h>
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#define PRIVATE_ARM_SMC_ID_STL_GET_MAX_GROUP 0x83000504
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#define PRIVATE_ARM_SMC_ID_STL_ONLINE_TEST 0x83000505
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#define CPUINSPECT_NOT_SUPPORTED -1
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static struct cpu_inspector atf_inspector;
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static int atf_get_group_num(void)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(PRIVATE_ARM_SMC_ID_STL_GET_MAX_GROUP, 0, 0, 0, 0,
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0, 0, 0, &res);
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return res.a0;
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}
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static int atf_run_chip_test(unsigned int group)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(PRIVATE_ARM_SMC_ID_STL_ONLINE_TEST, group, 0, 0, 0,
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0, 0, 0, &res);
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return res.a0;
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}
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static struct cpu_inspector atf_inspector = {
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.name = "atf",
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.start_inspect = atf_run_chip_test,
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};
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/**
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* init_atf_inspector - initializes the inspector
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*/
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static __init int init_atf_inspector(void)
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{
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unsigned long ret;
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ret = atf_get_group_num();
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if (ret == CPUINSPECT_NOT_SUPPORTED) {
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pr_info("BIOS does not support CPU inspect.\nFailed to register inspector %s\n",
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atf_inspector.name);
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return -EOPNOTSUPP;
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}
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atf_inspector.group_num = ret;
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return cpuinspect_register_inspector(&atf_inspector);
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}
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static __exit void exit_atf_inspector(void)
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{
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cpuinspect_unregister_inspector(&atf_inspector);
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}
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MODULE_LICENSE("GPL");
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module_init(init_atf_inspector);
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module_exit(exit_atf_inspector);
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