125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* inspector.c - inspector support
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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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#define pr_fmt(fmt) "CPUINSPECT: " fmt
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#include <linux/cpu.h>
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#include <linux/cpuinspect.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/pm_qos.h>
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#include "cpuinspect.h"
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char param_inspector[CPUINSPECT_NAME_LEN];
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LIST_HEAD(cpu_inspectors);
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struct cpu_inspector *curr_cpu_inspector;
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struct cpu_inspector *prev_cpu_inspector;
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/**
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* cpuinspect_find_inspector - finds a inspector of the specified name
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* @str: the name
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*/
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static struct cpu_inspector *cpuinspect_find_inspector(const char *str)
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{
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struct cpu_inspector *insp;
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list_for_each_entry(insp, &cpu_inspectors, list)
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if (!strncasecmp(str, insp->name, CPUINSPECT_NAME_LEN))
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return insp;
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return NULL;
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}
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/**
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* cpuinspect_switch_inspector - changes the inspector
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* @insp: the new target inspector
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*/
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int cpuinspect_switch_inspector(struct cpu_inspector *insp)
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{
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if (!insp)
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return -EINVAL;
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if (insp == curr_cpu_inspector)
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return 0;
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curr_cpu_inspector = insp;
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pr_info("using inspector %s, group_num: %lu\n", insp->name, insp->group_num);
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return 0;
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}
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/**
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* cpuinspect_register_inspector - registers a inspector
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* @insp: the inspector
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*/
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int cpuinspect_register_inspector(struct cpu_inspector *insp)
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{
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int ret = -EEXIST;
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if (!insp)
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return -EINVAL;
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mutex_lock(&cpuinspect_lock);
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if (cpuinspect_find_inspector(insp->name) == NULL) {
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ret = 0;
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list_add_tail(&insp->list, &cpu_inspectors);
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/*
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* We select the inspector if current inspector is NULL or it is
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* one specificed by kernel parameter.
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*/
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if (!curr_cpu_inspector ||
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!strncasecmp(param_inspector, insp->name, CPUINSPECT_NAME_LEN))
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cpuinspect_switch_inspector(insp);
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}
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mutex_unlock(&cpuinspect_lock);
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return ret;
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}
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EXPORT_SYMBOL(cpuinspect_register_inspector);
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/**
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* cpuinspect_unregister_inspector - unregisters a inspector
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* @insp: the inspector
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*/
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int cpuinspect_unregister_inspector(struct cpu_inspector *insp)
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{
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if (!insp)
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return -EINVAL;
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mutex_lock(&cpuinspect_lock);
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if (curr_cpu_inspector == insp) {
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if (ci_core.inspect_on) {
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mutex_unlock(&cpuinspect_lock);
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return -EBUSY;
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}
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curr_cpu_inspector = NULL;
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}
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if (!list_empty(&insp->list))
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list_del(&insp->list);
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mutex_unlock(&cpuinspect_lock);
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return 0;
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}
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EXPORT_SYMBOL(cpuinspect_unregister_inspector);
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