Commit 133e66ca authored by Yu Liao's avatar Yu Liao
Browse files

cpuinspect: add ATF inspector 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7ZBQB



----------------------------------

This inspector implements the execution of inspection instructions
in BIOS.

Using smc to get group num and execute inspection test cases from
arm-trusted-firmware.

Signed-off-by: default avatarYu Liao <liaoyu15@huawei.com>
parent d91c6db8

drivers/cpuinspect/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -10,4 +10,15 @@ config CPU_INSPECT 
	  of SDC by proactively executing CPU inspection test cases. It

	  includes modular inspector that can be swapped during runtime.



if CPU_INSPECT



config CPU_INSPECTOR_ATF

    tristate "ATF CPU inspector"

        depends on ARM64

        default n

        help

          This inspector implements the execution of inspection instructions

          in BIOS.



endif

endmenu

drivers/cpuinspect/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,4 +3,5 @@ 
# Makefile for cpuinspect.

#

obj-$(CONFIG_CPU_INSPECT) += cpu_inspect.o

obj-$(CONFIG_CPU_INSPECTOR_ATF) += inspector-atf.o

cpu_inspect-y = cpuinspect.o inspector.o sysfs.o

drivers/cpuinspect/inspector-atf.c

0 → 100644
+81 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * inspector-atf: cpuinspect inspector for EFI-based systems

 *

 * Copyright (c) Huawei Technologies Co., Ltd. 2022-2023. All rights reserved.

 *

 * Author: Yu Liao <liaoyu15@huawei.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/cpuinspect.h>

#include <linux/arm-smccc.h>



#define PRIVATE_ARM_SMC_ID_STL_GET_MAX_GROUP	0x83000504

#define PRIVATE_ARM_SMC_ID_STL_ONLINE_TEST	0x83000505

#define CPUINSPECT_NOT_SUPPORTED		-1



static struct cpu_inspector atf_inspector;



static int atf_get_group_num(void)

{

	struct arm_smccc_res res;



	arm_smccc_smc(PRIVATE_ARM_SMC_ID_STL_GET_MAX_GROUP, 0, 0, 0, 0,

			0, 0, 0, &res);



	return res.a0;

}



static int atf_run_chip_test(unsigned int group)

{

	struct arm_smccc_res res;



	arm_smccc_smc(PRIVATE_ARM_SMC_ID_STL_ONLINE_TEST, group, 0, 0, 0,

			0, 0, 0, &res);



	return res.a0;

}



static struct cpu_inspector atf_inspector = {

	.name		= "atf",

	.start_inspect	= atf_run_chip_test,

};



/**

 * init_atf_inspector - initializes the inspector

 */

static __init int init_atf_inspector(void)

{

	unsigned long ret;



	ret = atf_get_group_num();

	if (ret == CPUINSPECT_NOT_SUPPORTED) {

		pr_info("BIOS does not support CPU inspect.\nFailed to register inspector %s\n",

			atf_inspector.name);

		return -EOPNOTSUPP;

	}



	atf_inspector.group_num = ret;



	return cpuinspect_register_inspector(&atf_inspector);

}



static __exit void exit_atf_inspector(void)

{

	cpuinspect_unregister_inspector(&atf_inspector);

}



MODULE_LICENSE("GPL");

module_init(init_atf_inspector);

module_exit(exit_atf_inspector);