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Subject: Re: [PATCH] scsi: ufs: Add total count for each error history
To:     DooHyun Hwang <dh0421.hwang@samsung.com>,
        linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
        alim.akhtar@samsung.com, avri.altman@wdc.com, jejb@linux.ibm.com,
        martin.petersen@oracle.com, stanley.chu@mediatek.com,
        cang@codeaurora.org, asutoshd@codeaurora.org, beanhuo@micron.com,
        jaegeuk@kernel.org, satyat@google.com
Cc:     grant.jung@samsung.com, jt77.jang@samsung.com,
        junwoo80.lee@samsung.com, jangsub.yi@samsung.com,
        sh043.lee@samsung.com, cw9316.lee@samsung.com,
        sh8267.baek@samsung.com, wkon.kim@samsung.com
References: <CGME20210203070741epcas1p20ce8cc24d06b3c82d735dff59f0459de@epcas1p2.samsung.com>
 <20210203065346.26606-1-dh0421.hwang@samsung.com>
From:   Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki
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Date:   Wed, 3 Feb 2021 09:27:26 +0200
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On 3/02/21 8:53 am, DooHyun Hwang wrote:
> Since the total error history count is unknown because the error history
> records only the number of UFS_EVENT_HIST_LENGTH, add a member to count
> each error history.
> 
> Signed-off-by: DooHyun Hwang <dh0421.hwang@samsung.com>

Hi

Please note that the following patch is already queued - see linux-next

                                                                                       
commit b6cacaf2044fd9b82e5ceac88d8d17e04a01982f                                                                                                                                           
Author: Adrian Hunter <adrian.hunter@intel.com>                                                                                                                                           
Date:   Thu Jan 7 09:25:38 2021 +0200                                                                                                                                                     
                                                                                                                                                                                          
    scsi: ufs: ufs-debugfs: Add error counters                                                                                                                                            
                                                                                                                                                                                          
    People testing have a need to know how many errors might be occurring over                                                                                                            
    time. Add error counters and expose them via debugfs.                                                                                                                                 
                                                                                                                                                                                          
    A module initcall is used to create a debugfs root directory for                                                                                                                      
    ufshcd-related items. In the case that modules are built-in, then                                                                                                                     
    initialization is done in link order, so move ufshcd-core to the top of the
    Makefile.
    
    Link: https://lore.kernel.org/r/20210107072538.21782-1-adrian.hunter@intel.com
    Reviewed-by: Avri Altman <avri.altman@wdc.com>
    Reviewed-by: Bean Huo <beanhuo@micron.com>
    Reviewed-by: Can Guo <cang@codeaurora.org>
    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>


> ---
>  drivers/scsi/ufs/ufshcd.c | 3 +++
>  drivers/scsi/ufs/ufshcd.h | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index fb32d122f2e3..7ebc892553fc 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -437,6 +437,8 @@ static void ufshcd_print_evt(struct ufs_hba *hba, u32 id,
>  
>  	if (!found)
>  		dev_err(hba->dev, "No record of %s\n", err_name);
> +	else
> +		dev_err(hba->dev, "%s: total count=%u\n", err_name, e->count);
>  }
>  
>  static void ufshcd_print_evt_hist(struct ufs_hba *hba)
> @@ -4544,6 +4546,7 @@ void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val)
>  	e->val[e->pos] = val;
>  	e->tstamp[e->pos] = ktime_get();
>  	e->pos = (e->pos + 1) % UFS_EVENT_HIST_LENGTH;
> +	e->count++;
>  
>  	ufshcd_vops_event_notify(hba, id, &val);
>  }
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index aa9ea3552323..df28d3fc89a5 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -450,6 +450,7 @@ struct ufs_event_hist {
>  	int pos;
>  	u32 val[UFS_EVENT_HIST_LENGTH];
>  	ktime_t tstamp[UFS_EVENT_HIST_LENGTH];
> +	u32 count;
>  };
>  
>  /**
>