diff options
Diffstat (limited to 'drivers/scsi/ufs/ufs-fault-injection.c')
-rw-r--r-- | drivers/scsi/ufs/ufs-fault-injection.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufs-fault-injection.c b/drivers/scsi/ufs/ufs-fault-injection.c new file mode 100644 index 000000000000..7ac7c4e7ff83 --- /dev/null +++ b/drivers/scsi/ufs/ufs-fault-injection.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/kconfig.h> +#include <linux/types.h> +#include <linux/fault-inject.h> +#include <linux/module.h> +#include "ufs-fault-injection.h" + +static int ufs_fault_get(char *buffer, const struct kernel_param *kp); +static int ufs_fault_set(const char *val, const struct kernel_param *kp); + +static const struct kernel_param_ops ufs_fault_ops = { + .get = ufs_fault_get, + .set = ufs_fault_set, +}; + +enum { FAULT_INJ_STR_SIZE = 80 }; + +/* + * For more details about fault injection, please refer to + * Documentation/fault-injection/fault-injection.rst. + */ +static char g_trigger_eh_str[FAULT_INJ_STR_SIZE]; +module_param_cb(trigger_eh, &ufs_fault_ops, g_trigger_eh_str, 0644); +MODULE_PARM_DESC(trigger_eh, + "Fault injection. trigger_eh=<interval>,<probability>,<space>,<times>"); +static DECLARE_FAULT_ATTR(ufs_trigger_eh_attr); + +static char g_timeout_str[FAULT_INJ_STR_SIZE]; +module_param_cb(timeout, &ufs_fault_ops, g_timeout_str, 0644); +MODULE_PARM_DESC(timeout, + "Fault injection. timeout=<interval>,<probability>,<space>,<times>"); +static DECLARE_FAULT_ATTR(ufs_timeout_attr); + +static int ufs_fault_get(char *buffer, const struct kernel_param *kp) +{ + const char *fault_str = kp->arg; + + return sysfs_emit(buffer, "%s\n", fault_str); +} + +static int ufs_fault_set(const char *val, const struct kernel_param *kp) +{ + struct fault_attr *attr = NULL; + + if (kp->arg == g_trigger_eh_str) + attr = &ufs_trigger_eh_attr; + else if (kp->arg == g_timeout_str) + attr = &ufs_timeout_attr; + + if (WARN_ON_ONCE(!attr)) + return -EINVAL; + + if (!setup_fault_attr(attr, (char *)val)) + return -EINVAL; + + strlcpy(kp->arg, val, FAULT_INJ_STR_SIZE); + + return 0; +} + +bool ufs_trigger_eh(void) +{ + return should_fail(&ufs_trigger_eh_attr, 1); +} + +bool ufs_fail_completion(void) +{ + return should_fail(&ufs_timeout_attr, 1); +} |