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The UFS driver has two driver-specific fault injection mechanisms (trigger_eh and timeout). Each fault injection configuration can only be specified by a module parameter and cannot be reconfigured without reloading the driver. Also, each configuration is common to all HBAs. This change adds the following subdirectories for each UFS HBA when debugfs is enabled: /sys/kernel/debug/ufshcd/<HBA>/timeout_inject /sys/kernel/debug/ufshcd/<HBA>/trigger_eh_inject Each fault injection attribute can be dynamically set per HBA by a corresponding file in these directories. This is tested with QEMU UFS devices. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Link: https://lore.kernel.org/r/20231118124443.1007116-1-akinobu.mita@gmail.com Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
// 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/ufshcd.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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strscpy(kp->arg, val, FAULT_INJ_STR_SIZE);
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return 0;
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}
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void ufs_fault_inject_hba_init(struct ufs_hba *hba)
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{
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hba->trigger_eh_attr = ufs_trigger_eh_attr;
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hba->timeout_attr = ufs_timeout_attr;
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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fault_create_debugfs_attr("trigger_eh_inject", hba->debugfs_root, &hba->trigger_eh_attr);
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fault_create_debugfs_attr("timeout_inject", hba->debugfs_root, &hba->timeout_attr);
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#endif
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}
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bool ufs_trigger_eh(struct ufs_hba *hba)
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{
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return should_fail(&hba->trigger_eh_attr, 1);
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}
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bool ufs_fail_completion(struct ufs_hba *hba)
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{
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return should_fail(&hba->timeout_attr, 1);
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}
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