memory: memory notifier error injection module

This provides the ability to inject artifical errors to memory hotplug
notifier chain callbacks.  It is controlled through debugfs interface
under /sys/kernel/debug/notifier-error-inject/memory

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

Example: Inject memory hotplug offline error (-12 == -ENOMEM)

	# cd /sys/kernel/debug/notifier-error-inject/memory
	# echo -12 > actions/MEM_GOING_OFFLINE/error
	# echo offline > /sys/devices/system/memory/memoryXXX/state
	bash: echo: write error: Cannot allocate memory

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Greg KH <greg@kroah.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c2024d8..35cfd9e 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1143,6 +1143,29 @@ config PM_NOTIFIER_ERROR_INJECT
 
          If unsure, say N.
 
+config MEMORY_NOTIFIER_ERROR_INJECT
+       tristate "Memory hotplug notifier error injection module"
+       depends on MEMORY_HOTPLUG_SPARSE && NOTIFIER_ERROR_INJECTION
+       help
+         This option provides the ability to inject artifical errors to
+         memory hotplug notifier chain callbacks.  It is controlled through
+         debugfs interface under /sys/kernel/debug/notifier-error-inject/memory
+
+         If the notifier call chain should be failed with some events
+         notified, write the error code to "actions/<notifier event>/error".
+
+         Example: Inject memory hotplug offline error (-12 == -ENOMEM)
+
+         # cd /sys/kernel/debug/notifier-error-inject/memory
+         # echo -12 > actions/MEM_GOING_OFFLINE/error
+         # echo offline > /sys/devices/system/memory/memoryXXX/state
+         bash: echo: write error: Cannot allocate memory
+
+         To compile this code as a module, choose M here: the module will
+         be called pSeries-reconfig-notifier-error-inject.
+
+         If unsure, say N.
+
 config FAULT_INJECTION
        bool "Fault-injection framework"
        depends on DEBUG_KERNEL

diff --git a/lib/Makefile b/lib/Makefile
index c32c664..c347193 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -93,6 +93,7 @@ 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
+obj-$(CONFIG_MEMORY_NOTIFIER_ERROR_INJECT) += memory-notifier-error-inject.o
 
 lib-$(CONFIG_GENERIC_BUG) += bug.o
 

diff --git a/lib/memory-notifier-error-inject.c b/lib/memory-notifier-error-inject.c
new file mode 100644 (file)
index 0000000..e6239bf
--- /dev/null
+++ b/lib/memory-notifier-error-inject.c
@@ -0,0 +1,48 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/memory.h>
+
+#include "notifier-error-inject.h"
+
+static int priority;
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify memory notifier priority");
+
+static struct notifier_err_inject memory_notifier_err_inject = {
+       .actions = {
+               { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
+               { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
+               {}
+       }
+};
+
+static struct dentry *dir;
+
+static int err_inject_init(void)
+{
+       int err;
+
+       dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
+                                       &memory_notifier_err_inject, priority);
+       if (IS_ERR(dir))
+               return PTR_ERR(dir);
+
+       err = register_memory_notifier(&memory_notifier_err_inject.nb);
+       if (err)
+               debugfs_remove_recursive(dir);
+
+       return err;
+}
+
+static void err_inject_exit(void)
+{
+       unregister_memory_notifier(&memory_notifier_err_inject.nb);
+       debugfs_remove_recursive(dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("memory notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");