virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB7PU3 CVE: NA
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To ensure energy efficiency, haltpoll is disabled by default. But In some performance scenarios, you can enable haltpoll using the following methods:
echo Y > /sys/module/cpuidle_haltpoll/parameters/force
Signed-off-by: Xiangyou Xie xiexiangyou@huawei.com Signed-off-by: lishusen lishusen2@huawei.com --- drivers/cpuidle/cpuidle-haltpoll.c | 95 +++++++++++++++++++++++++++++- 1 file changed, 93 insertions(+), 2 deletions(-)
diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c index d47906632ce3..24f379d72b04 100644 --- a/drivers/cpuidle/cpuidle-haltpoll.c +++ b/drivers/cpuidle/cpuidle-haltpoll.c @@ -17,9 +17,16 @@ #include <linux/sched/idle.h> #include <linux/cpuidle_haltpoll.h>
-static bool force __read_mostly; -module_param(force, bool, 0444); +static bool force; MODULE_PARM_DESC(force, "Load unconditionally"); +static int enable_haltpoll_driver(const char *val, const struct kernel_param *kp); + +static const struct kernel_param_ops enable_haltpoll_ops = { + .set = enable_haltpoll_driver, + .get = param_get_bool, +}; +module_param_cb(force, &enable_haltpoll_ops, &force, 0644); +
static struct cpuidle_device __percpu *haltpoll_cpuidle_devices; static enum cpuhp_state haltpoll_hp_state; @@ -129,6 +136,90 @@ static void __exit haltpoll_exit(void) haltpoll_uninit(); }
+#ifdef CONFIG_ARM64 +static int register_haltpoll_driver(void) +{ + int ret; + struct cpuidle_driver *drv = &haltpoll_driver; + +#ifdef CONFIG_X86 + /* Do not load haltpoll if idle= is passed */ + if (boot_option_idle_override != IDLE_NO_OVERRIDE) + return -ENODEV; +#endif + + cpuidle_poll_state_init(drv); + + ret = cpuidle_register_driver(drv); + if (ret < 0) + return ret; + + haltpoll_cpuidle_devices = alloc_percpu(struct cpuidle_device); + if (haltpoll_cpuidle_devices == NULL) { + cpuidle_unregister_driver(drv); + return -ENOMEM; + } + + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "cpuidle/haltpoll:online", + haltpoll_cpu_online, haltpoll_cpu_offline); + if (ret < 0) { + haltpoll_uninit(); + } else { + haltpoll_hp_state = ret; + ret = 0; + } + + return ret; +} + +static void unregister_haltpoll_driver(void) +{ + if (haltpoll_hp_state) + cpuhp_remove_state(haltpoll_hp_state); + cpuidle_unregister_driver(&haltpoll_driver); + + free_percpu(haltpoll_cpuidle_devices); + haltpoll_cpuidle_devices = NULL; + +} + +static int enable_haltpoll_driver(const char *val, const struct kernel_param *kp) +{ + int ret; + bool do_enable; + + if (!val) + return 0; + + ret = strtobool(val, &do_enable); + + if (ret || force == do_enable) + return ret; + + if (do_enable) { + ret = register_haltpoll_driver(); + + if (!ret) { + pr_info("Enable haltpoll driver.\n"); + force = 1; + } else { + pr_err("Fail to enable haltpoll driver.\n"); + } + } else { + unregister_haltpoll_driver(); + force = 0; + pr_info("Unregister haltpoll driver.\n"); + } + + return ret; +} +#else +static int enable_haltpoll_driver(const char *val, const struct kernel_param *kp) +{ + return -1; +} +#endif + module_init(haltpoll_init); module_exit(haltpoll_exit); MODULE_LICENSE("GPL");