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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-09-06 20:04:50 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-19 22:44:31 +0300 |
| commit | 8c58898b3ecb213ad7c52aa0c7c9d3201e559be1 (patch) | |
| tree | 3375fa766e1dc1b0b383569229171ee34b8a9b7e /lib/cpu-notifier-error-inject.c | |
| parent | 30e92153b4e6f1cd01e30c34d9ef6f0986f96b0e (diff) | |
| download | linux-8c58898b3ecb213ad7c52aa0c7c9d3201e559be1.tar.xz | |
fault-injection/cpu: Convert to hotplug state machine
Install the callbacks via the state machine.
This is just a temporary vehicle to keep the interface working for now,
It'll be replaced by the sysfs interface which allows to step through the
hotplug state machine step by step.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-15-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'lib/cpu-notifier-error-inject.c')
| -rw-r--r-- | lib/cpu-notifier-error-inject.c | 46 |
1 files changed, 40 insertions, 6 deletions
diff --git a/lib/cpu-notifier-error-inject.c b/lib/cpu-notifier-error-inject.c index 707ca24f7b18..0e2c9a1e958a 100644 --- a/lib/cpu-notifier-error-inject.c +++ b/lib/cpu-notifier-error-inject.c @@ -8,16 +8,47 @@ static int priority; module_param(priority, int, 0); MODULE_PARM_DESC(priority, "specify cpu notifier priority"); +#define UP_PREPARE 0 +#define UP_PREPARE_FROZEN 0 +#define DOWN_PREPARE 0 +#define DOWN_PREPARE_FROZEN 0 + static struct notifier_err_inject cpu_notifier_err_inject = { .actions = { - { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE) }, - { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE_FROZEN) }, - { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE) }, - { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE_FROZEN) }, + { NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE) }, + { NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE_FROZEN) }, + { NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE) }, + { NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE_FROZEN) }, {} } }; +static int notf_err_handle(struct notifier_err_inject_action *action) +{ + int ret; + + ret = action->error; + if (ret) + pr_info("Injecting error (%d) to %s\n", ret, action->name); + return ret; +} + +static int notf_err_inj_up_prepare(unsigned int cpu) +{ + if (!cpuhp_tasks_frozen) + return notf_err_handle(&cpu_notifier_err_inject.actions[0]); + else + return notf_err_handle(&cpu_notifier_err_inject.actions[1]); +} + +static int notf_err_inj_dead(unsigned int cpu) +{ + if (!cpuhp_tasks_frozen) + return notf_err_handle(&cpu_notifier_err_inject.actions[2]); + else + return notf_err_handle(&cpu_notifier_err_inject.actions[3]); +} + static struct dentry *dir; static int err_inject_init(void) @@ -29,7 +60,10 @@ static int err_inject_init(void) if (IS_ERR(dir)) return PTR_ERR(dir); - err = register_hotcpu_notifier(&cpu_notifier_err_inject.nb); + err = cpuhp_setup_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE, + "cpu-err-notif:prepare", + notf_err_inj_up_prepare, + notf_err_inj_dead); if (err) debugfs_remove_recursive(dir); @@ -38,7 +72,7 @@ static int err_inject_init(void) static void err_inject_exit(void) { - unregister_hotcpu_notifier(&cpu_notifier_err_inject.nb); + cpuhp_remove_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE); debugfs_remove_recursive(dir); } |