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powerpc: pSeries reconfig notifier error injection module

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

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

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>
This commit is contained in:
Akinobu Mita 2012-07-30 14:43:13 -07:00 committed by Linus Torvalds
parent 9579f5bd31
commit 08dfb4ddee
3 changed files with 70 additions and 0 deletions
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17
lib/Kconfig.debug
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@ -1166,6 +1166,23 @@ config MEMORY_NOTIFIER_ERROR_INJECT
If unsure, say N.
config PSERIES_RECONFIG_NOTIFIER_ERROR_INJECT
tristate "pSeries reconfig notifier error injection module"
depends on PPC_PSERIES && NOTIFIER_ERROR_INJECTION
help
This option provides the ability to inject artifical errors to
pSeries reconfig notifier chain callbacks. It is controlled
through debugfs interface under
/sys/kernel/debug/notifier-error-inject/pSeries-reconfig/
If the notifier call chain should be failed with some events
notified, write the error code to "actions/<notifier event>/error".
To compile this code as a module, choose M here: the module will
be called memory-notifier-error-inject.
If unsure, say N.
config FAULT_INJECTION
bool "Fault-injection framework"
depends on DEBUG_KERNEL

2
lib/Makefile
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@ -94,6 +94,8 @@ 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
obj-$(CONFIG_PSERIES_RECONFIG_NOTIFIER_ERROR_INJECT) += \
pSeries-reconfig-notifier-error-inject.o
lib-$(CONFIG_GENERIC_BUG) += bug.o

51
lib/pSeries-reconfig-notifier-error-inject.c Normal file
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@ -0,0 +1,51 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/pSeries_reconfig.h>
#include "notifier-error-inject.h"
static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify pSeries reconfig notifier priority");
static struct notifier_err_inject reconfig_err_inject = {
.actions = {
{ NOTIFIER_ERR_INJECT_ACTION(PSERIES_RECONFIG_ADD) },
{ NOTIFIER_ERR_INJECT_ACTION(PSERIES_RECONFIG_REMOVE) },
{ NOTIFIER_ERR_INJECT_ACTION(PSERIES_DRCONF_MEM_ADD) },
{ NOTIFIER_ERR_INJECT_ACTION(PSERIES_DRCONF_MEM_REMOVE) },
{}
}
};
static struct dentry *dir;
static int err_inject_init(void)
{
int err;
dir = notifier_err_inject_init("pSeries-reconfig",
notifier_err_inject_dir, &reconfig_err_inject, priority);
if (IS_ERR(dir))
return PTR_ERR(dir);
err = pSeries_reconfig_notifier_register(&reconfig_err_inject.nb);
if (err)
debugfs_remove_recursive(dir);
return err;
}
static void err_inject_exit(void)
{
pSeries_reconfig_notifier_unregister(&reconfig_err_inject.nb);
debugfs_remove_recursive(dir);
}
module_init(err_inject_init);
module_exit(err_inject_exit);
MODULE_DESCRIPTION("pSeries reconfig notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");