1 #include <linux/kernel.h>
2 #include <linux/module.h>
5 #include "notifier-error-inject.h"
8 module_param(priority, int, 0);
9 MODULE_PARM_DESC(priority, "specify cpu notifier priority");
12 #define UP_PREPARE_FROZEN 0
13 #define DOWN_PREPARE 0
14 #define DOWN_PREPARE_FROZEN 0
16 static struct notifier_err_inject cpu_notifier_err_inject = {
18 { NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE) },
19 { NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE_FROZEN) },
20 { NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE) },
21 { NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE_FROZEN) },
26 static int notf_err_handle(struct notifier_err_inject_action *action)
32 pr_info("Injecting error (%d) to %s\n", ret, action->name);
36 static int notf_err_inj_up_prepare(unsigned int cpu)
38 if (!cpuhp_tasks_frozen)
39 return notf_err_handle(&cpu_notifier_err_inject.actions[0]);
41 return notf_err_handle(&cpu_notifier_err_inject.actions[1]);
44 static int notf_err_inj_dead(unsigned int cpu)
46 if (!cpuhp_tasks_frozen)
47 return notf_err_handle(&cpu_notifier_err_inject.actions[2]);
49 return notf_err_handle(&cpu_notifier_err_inject.actions[3]);
52 static struct dentry *dir;
54 static int err_inject_init(void)
58 dir = notifier_err_inject_init("cpu", notifier_err_inject_dir,
59 &cpu_notifier_err_inject, priority);
63 err = cpuhp_setup_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE,
64 "cpu-err-notif:prepare",
65 notf_err_inj_up_prepare,
68 debugfs_remove_recursive(dir);
73 static void err_inject_exit(void)
75 cpuhp_remove_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE);
76 debugfs_remove_recursive(dir);
79 module_init(err_inject_init);
80 module_exit(err_inject_exit);
82 MODULE_DESCRIPTION("CPU notifier error injection module");
83 MODULE_LICENSE("GPL");
84 MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");