1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/kconfig.h> 4 #include <linux/types.h> 5 #include <linux/fault-inject.h> 6 #include <linux/module.h> 7 #include "ufs-fault-injection.h" 8 9 static int ufs_fault_get(char *buffer, const struct kernel_param *kp); 10 static int ufs_fault_set(const char *val, const struct kernel_param *kp); 11 12 static const struct kernel_param_ops ufs_fault_ops = { 13 .get = ufs_fault_get, 14 .set = ufs_fault_set, 15 }; 16 17 enum { FAULT_INJ_STR_SIZE = 80 }; 18 19 /* 20 * For more details about fault injection, please refer to 21 * Documentation/fault-injection/fault-injection.rst. 22 */ 23 static char g_trigger_eh_str[FAULT_INJ_STR_SIZE]; 24 module_param_cb(trigger_eh, &ufs_fault_ops, g_trigger_eh_str, 0644); 25 MODULE_PARM_DESC(trigger_eh, 26 "Fault injection. trigger_eh=<interval>,<probability>,<space>,<times>"); 27 static DECLARE_FAULT_ATTR(ufs_trigger_eh_attr); 28 29 static char g_timeout_str[FAULT_INJ_STR_SIZE]; 30 module_param_cb(timeout, &ufs_fault_ops, g_timeout_str, 0644); 31 MODULE_PARM_DESC(timeout, 32 "Fault injection. timeout=<interval>,<probability>,<space>,<times>"); 33 static DECLARE_FAULT_ATTR(ufs_timeout_attr); 34 35 static int ufs_fault_get(char *buffer, const struct kernel_param *kp) 36 { 37 const char *fault_str = kp->arg; 38 39 return sysfs_emit(buffer, "%s\n", fault_str); 40 } 41 42 static int ufs_fault_set(const char *val, const struct kernel_param *kp) 43 { 44 struct fault_attr *attr = NULL; 45 46 if (kp->arg == g_trigger_eh_str) 47 attr = &ufs_trigger_eh_attr; 48 else if (kp->arg == g_timeout_str) 49 attr = &ufs_timeout_attr; 50 51 if (WARN_ON_ONCE(!attr)) 52 return -EINVAL; 53 54 if (!setup_fault_attr(attr, (char *)val)) 55 return -EINVAL; 56 57 strscpy(kp->arg, val, FAULT_INJ_STR_SIZE); 58 59 return 0; 60 } 61 62 bool ufs_trigger_eh(void) 63 { 64 return should_fail(&ufs_trigger_eh_attr, 1); 65 } 66 67 bool ufs_fail_completion(void) 68 { 69 return should_fail(&ufs_timeout_attr, 1); 70 } 71