71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/kconfig.h>
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#include <linux/types.h>
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#include <linux/fault-inject.h>
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#include <linux/module.h>
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#include "ufs-fault-injection.h"
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static int ufs_fault_get(char *buffer, const struct kernel_param *kp);
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static int ufs_fault_set(const char *val, const struct kernel_param *kp);
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static const struct kernel_param_ops ufs_fault_ops = {
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.get = ufs_fault_get,
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.set = ufs_fault_set,
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};
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enum { FAULT_INJ_STR_SIZE = 80 };
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/*
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* For more details about fault injection, please refer to
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* Documentation/fault-injection/fault-injection.rst.
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*/
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static char g_trigger_eh_str[FAULT_INJ_STR_SIZE];
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module_param_cb(trigger_eh, &ufs_fault_ops, g_trigger_eh_str, 0644);
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MODULE_PARM_DESC(trigger_eh,
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"Fault injection. trigger_eh=<interval>,<probability>,<space>,<times>");
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static DECLARE_FAULT_ATTR(ufs_trigger_eh_attr);
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static char g_timeout_str[FAULT_INJ_STR_SIZE];
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module_param_cb(timeout, &ufs_fault_ops, g_timeout_str, 0644);
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MODULE_PARM_DESC(timeout,
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"Fault injection. timeout=<interval>,<probability>,<space>,<times>");
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static DECLARE_FAULT_ATTR(ufs_timeout_attr);
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static int ufs_fault_get(char *buffer, const struct kernel_param *kp)
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{
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const char *fault_str = kp->arg;
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return sysfs_emit(buffer, "%s\n", fault_str);
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}
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static int ufs_fault_set(const char *val, const struct kernel_param *kp)
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{
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struct fault_attr *attr = NULL;
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if (kp->arg == g_trigger_eh_str)
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attr = &ufs_trigger_eh_attr;
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else if (kp->arg == g_timeout_str)
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attr = &ufs_timeout_attr;
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if (WARN_ON_ONCE(!attr))
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return -EINVAL;
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if (!setup_fault_attr(attr, (char *)val))
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return -EINVAL;
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strlcpy(kp->arg, val, FAULT_INJ_STR_SIZE);
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return 0;
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}
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bool ufs_trigger_eh(void)
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{
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return should_fail(&ufs_trigger_eh_attr, 1);
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}
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bool ufs_fail_completion(void)
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{
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return should_fail(&ufs_timeout_attr, 1);
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}
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