forked from Minki/linux
fa86ee90eb
Add a cpuidle driver that calls the architecture default_idle routine. To be used in conjunction with the haltpoll governor. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* cpuidle driver for haltpoll governor.
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*
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* Copyright 2019 Red Hat, Inc. and/or its affiliates.
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Authors: Marcelo Tosatti <mtosatti@redhat.com>
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*/
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#include <linux/init.h>
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#include <linux/cpuidle.h>
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#include <linux/module.h>
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#include <linux/sched/idle.h>
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#include <linux/kvm_para.h>
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static int default_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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if (current_clr_polling_and_test()) {
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local_irq_enable();
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return index;
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}
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default_idle();
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return index;
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}
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static struct cpuidle_driver haltpoll_driver = {
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.name = "haltpoll",
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.owner = THIS_MODULE,
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.states = {
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{ /* entry 0 is for polling */ },
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{
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.enter = default_enter_idle,
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.exit_latency = 1,
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.target_residency = 1,
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.power_usage = -1,
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.name = "haltpoll idle",
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.desc = "default architecture idle",
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},
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},
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.safe_state_index = 0,
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.state_count = 2,
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};
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static int __init haltpoll_init(void)
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{
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struct cpuidle_driver *drv = &haltpoll_driver;
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cpuidle_poll_state_init(drv);
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if (!kvm_para_available())
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return 0;
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return cpuidle_register(&haltpoll_driver, NULL);
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}
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static void __exit haltpoll_exit(void)
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{
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cpuidle_unregister(&haltpoll_driver);
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}
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module_init(haltpoll_init);
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module_exit(haltpoll_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marcelo Tosatti <mtosatti@redhat.com>");
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