linux-kernel - Re: [PATCH v2 1/3] scsi: ufs: Minor adjustments to error handling

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Date:   Wed, 03 Mar 2021 18:03:42 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] scsi: ufs: Minor adjustments to error handling

Hi Avri,

On 2021-03-03 15:22, Avri Altman wrote:
>> 
>> 
>> In error handling prepare stage, after SCSI requests are blocked, do a
>> down/up_write(clk_scaling_lock) to clean up the queuecommand() path.
>> Meanwhile, stop eeh_work in case it disturbs error recovery. Moreover,
>> reset ufshcd_state at the entrance of ufshcd_probe_hba(), since it may 
>> be
>> called multiple times during error recovery.
>> 
>> Signed-off-by: Can Guo <cang@...eaurora.org>
> I noticed that you tagged Adrian's patch -
> https://lore.kernel.org/lkml/20210301191940.15247-1-adrian.hunter@intel.com/
> So this patch needs to be adjusted accordingly?

Thanks for pointing me to that one, I will rebase mine.

Regards,
Can Guo.

> 
> Thanks,
> Avri
> 
>> ---
>>  drivers/scsi/ufs/ufshcd.c | 18 ++++++++++++------
>>  1 file changed, 12 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 80620c8..013eb73 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -4987,6 +4987,7 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba,
>> struct ufshcd_lrb *lrbp)
>>                          * UFS device needs urgent BKOPs.
>>                          */
>>                         if (!hba->pm_op_in_progress &&
>> +                           !ufshcd_eh_in_progress(hba) &&
>>                             
>> ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) &&
>>                             schedule_work(&hba->eeh_work)) {
>>                                 /*
>> @@ -5784,13 +5785,20 @@ static void ufshcd_err_handling_prepare(struct
>> ufs_hba *hba)
>>                         ufshcd_suspend_clkscaling(hba);
>>                 ufshcd_clk_scaling_allow(hba, false);
>>         }
>> +       ufshcd_scsi_block_requests(hba);
>> +       /* Drain ufshcd_queuecommand() */
>> +       down_write(&hba->clk_scaling_lock);
>> +       up_write(&hba->clk_scaling_lock);
>> +       cancel_work_sync(&hba->eeh_work);
>>  }
>> 
>>  static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
>>  {
>> +       ufshcd_scsi_unblock_requests(hba);
>>         ufshcd_release(hba);
>>         if (ufshcd_is_clkscaling_supported(hba))
>>                 ufshcd_clk_scaling_suspend(hba, false);
>> +       ufshcd_clear_ua_wluns(hba);
>>         pm_runtime_put(hba->dev);
>>  }
>> 
>> @@ -5882,8 +5890,8 @@ static void ufshcd_err_handler(struct 
>> work_struct
>> *work)
>>         spin_unlock_irqrestore(hba->host->host_lock, flags);
>>         ufshcd_err_handling_prepare(hba);
>>         spin_lock_irqsave(hba->host->host_lock, flags);
>> -       ufshcd_scsi_block_requests(hba);
>> -       hba->ufshcd_state = UFSHCD_STATE_RESET;
>> +       if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
>> +               hba->ufshcd_state = UFSHCD_STATE_RESET;
>> 
>>         /* Complete requests that have door-bell cleared by h/w */
>>         ufshcd_complete_requests(hba);
>> @@ -6042,12 +6050,8 @@ static void ufshcd_err_handler(struct 
>> work_struct
>> *work)
>>         }
>>         ufshcd_clear_eh_in_progress(hba);
>>         spin_unlock_irqrestore(hba->host->host_lock, flags);
>> -       ufshcd_scsi_unblock_requests(hba);
>>         ufshcd_err_handling_unprepare(hba);
>>         up(&hba->host_sem);
>> -
>> -       if (!err && needs_reset)
>> -               ufshcd_clear_ua_wluns(hba);
>>  }
>> 
>>  /**
>> @@ -7858,6 +7862,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
>> bool async)
>>         unsigned long flags;
>>         ktime_t start = ktime_get();
>> 
>> +       hba->ufshcd_state = UFSHCD_STATE_RESET;
>> +
>>         ret = ufshcd_link_startup(hba);
>>         if (ret)
>>                 goto out;
>> --
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a 
>> Linux
>> Foundation Collaborative Project.