PM: PM notifier error injection module (048b9c35) · Commits · 戴 / test

lib/Kconfig.debug

+24 −0

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		@@ -1119,6 +1119,30 @@ config CPU_NOTIFIER_ERROR_INJECT

		If unsure, say N.

		config PM_NOTIFIER_ERROR_INJECT
		tristate "PM notifier error injection module"
		depends on PM && NOTIFIER_ERROR_INJECTION
		default m if PM_DEBUG
		help
		This option provides the ability to inject artifical errors to
		PM notifier chain callbacks. It is controlled through debugfs
		interface /sys/kernel/debug/notifier-error-inject/pm

		If the notifier call chain should be failed with some events
		notified, write the error code to "actions/<notifier event>/error".

		Example: Inject PM suspend error (-12 = -ENOMEM)

		# cd /sys/kernel/debug/notifier-error-inject/pm/
		# echo -12 > actions/PM_SUSPEND_PREPARE/error
		# echo mem > /sys/power/state
		bash: echo: write error: Cannot allocate memory

		To compile this code as a module, choose M here: the module will
		be called pm-notifier-error-inject.

		If unsure, say N.

		config FAULT_INJECTION
		bool "Fault-injection framework"
		depends on DEBUG_KERNEL

+1 −0

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		@@ -92,6 +92,7 @@ obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
		obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
		obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
		obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
		obj-$(CONFIG_PM_NOTIFIER_ERROR_INJECT) += pm-notifier-error-inject.o

		lib-$(CONFIG_GENERIC_BUG) += bug.o

0 → 100644

+49 −0

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		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/suspend.h>

		#include "notifier-error-inject.h"

		static int priority;
		module_param(priority, int, 0);
		MODULE_PARM_DESC(priority, "specify PM notifier priority");

		static struct notifier_err_inject pm_notifier_err_inject = {
		.actions = {
		{ NOTIFIER_ERR_INJECT_ACTION(PM_HIBERNATION_PREPARE) },
		{ NOTIFIER_ERR_INJECT_ACTION(PM_SUSPEND_PREPARE) },
		{ NOTIFIER_ERR_INJECT_ACTION(PM_RESTORE_PREPARE) },
		{}
		}
		};

		static struct dentry *dir;

		static int err_inject_init(void)
		{
		int err;

		dir = notifier_err_inject_init("pm", notifier_err_inject_dir,
		&pm_notifier_err_inject, priority);
		if (IS_ERR(dir))
		return PTR_ERR(dir);

		err = register_pm_notifier(&pm_notifier_err_inject.nb);
		if (err)
		debugfs_remove_recursive(dir);

		return err;
		}

		static void err_inject_exit(void)
		{
		unregister_pm_notifier(&pm_notifier_err_inject.nb);
		debugfs_remove_recursive(dir);
		}

		module_init(err_inject_init);
		module_exit(err_inject_exit);

		MODULE_DESCRIPTION("PM notifier error injection module");
		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");