linux-kernel - Re: [PATCH v5 7/7] ufs: core: Add error handling for MCQ mode

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Message-ID: <1e99521e-1e15-b7ec-30be-1f6a86ea728f@quicinc.com>
Date:   Mon, 22 May 2023 23:58:59 -0700
From:   "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To:     Bart Van Assche <bvanassche@....org>, <quic_asutoshd@...cinc.com>,
        <quic_cang@...cinc.com>, <mani@...nel.org>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <beanhuo@...ron.com>, <avri.altman@....com>,
        <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 7/7] ufs: core: Add error handling for MCQ mode

On 5/19/2023 4:03 PM, Bart Van Assche wrote:
> On 5/11/23 23:28, Bao D. Nguyen wrote:
>> @@ -6378,18 +6407,36 @@ static bool ufshcd_abort_all(struct ufs_hba *hba)
>>       bool needs_reset = false;
>>       int tag, ret;
>> -    /* Clear pending transfer requests */
>> -    for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
>> -        ret = ufshcd_try_to_abort_task(hba, tag);
>> -        dev_err(hba->dev, "Aborting tag %d / CDB %#02x %s\n", tag,
>> -            hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1,
>> -            ret ? "failed" : "succeeded");
>> -        if (ret) {
>> -            needs_reset = true;
>> -            goto out;
>> +    if (is_mcq_enabled(hba)) {
>> +        struct ufshcd_lrb *lrbp;
>> +        int tag;
>> +
>> +        for (tag = 0; tag < hba->nutrs; tag++) {
>> +            lrbp = &hba->lrb[tag];
>> +            if (!ufshcd_cmd_inflight(lrbp->cmd))
>> +                continue;
>> +            ret = ufshcd_try_to_abort_task(hba, tag);
>> +            dev_err(hba->dev, "Aborting tag %d / CDB %#02x %s\n", tag,
>> +                hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1,
>> +                ret ? "failed" : "succeeded");
>> +            if (ret) {
>> +                needs_reset = true;
>> +                goto out;
>> +            }
>> +        }
>> +    } else {
>> +        /* Clear pending transfer requests */
>> +        for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
>> +            ret = ufshcd_try_to_abort_task(hba, tag);
>> +            dev_err(hba->dev, "Aborting tag %d / CDB %#02x %s\n", tag,
>> +                hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1,
>> +                ret ? "failed" : "succeeded");
>> +            if (ret) {
>> +                needs_reset = true;
>> +                goto out;
>> +            }
>>           }
>>       }
> 
> Please move the ufshcd_cmd_inflight() check into ufshcd_try_to_abort_task()
> such that the same code path can be used for MCQ and legacy mode.
Hi Bart,
Because the ufshcd_try_to_abort_task() is shared by sdb and mcq modes, I 
feel a bit uncomfortable using the new function ufshcd_cmd_inflight() in 
ufshcd_try_to_abort_task(). In this patch series, I am trying to avoid 
changing the sdb error handling logic as much as possible; only add 
error handling support for mcq mode. If you feel there is a very good 
benefit in making the change, I would give it a try. Otherwise, I would 
prefer not touching sdb error handling code that has been working well. 
Please let me know.

Thanks,
Bao

> 
> Thanks,
> 
> Bart.