#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include "notifier-error-inject.h"
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static int priority;
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module_param(priority, int, 0);
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MODULE_PARM_DESC(priority, "specify cpu notifier priority");
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#define UP_PREPARE 0
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#define UP_PREPARE_FROZEN 0
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#define DOWN_PREPARE 0
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#define DOWN_PREPARE_FROZEN 0
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static struct notifier_err_inject cpu_notifier_err_inject = {
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.actions = {
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{ NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE) },
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{ NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE_FROZEN) },
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{ NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE) },
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{ NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE_FROZEN) },
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{}
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}
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};
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static int notf_err_handle(struct notifier_err_inject_action *action)
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{
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int ret;
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ret = action->error;
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if (ret)
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pr_info("Injecting error (%d) to %s\n", ret, action->name);
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return ret;
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}
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static int notf_err_inj_up_prepare(unsigned int cpu)
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{
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if (!cpuhp_tasks_frozen)
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return notf_err_handle(&cpu_notifier_err_inject.actions[0]);
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else
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return notf_err_handle(&cpu_notifier_err_inject.actions[1]);
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}
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static int notf_err_inj_dead(unsigned int cpu)
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{
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if (!cpuhp_tasks_frozen)
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return notf_err_handle(&cpu_notifier_err_inject.actions[2]);
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else
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return notf_err_handle(&cpu_notifier_err_inject.actions[3]);
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}
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static struct dentry *dir;
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static int err_inject_init(void)
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{
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int err;
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dir = notifier_err_inject_init("cpu", notifier_err_inject_dir,
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&cpu_notifier_err_inject, priority);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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err = cpuhp_setup_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE,
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"cpu-err-notif:prepare",
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notf_err_inj_up_prepare,
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notf_err_inj_dead);
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if (err)
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debugfs_remove_recursive(dir);
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return err;
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}
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static void err_inject_exit(void)
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{
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cpuhp_remove_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE);
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debugfs_remove_recursive(dir);
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}
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module_init(err_inject_init);
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module_exit(err_inject_exit);
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MODULE_DESCRIPTION("CPU notifier error injection module");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
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