linux-kernel - Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

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Message-ID: <99294805-d8b0-1c40-5f44-ebd9d0e6abb4@quicinc.com>
Date:   Mon, 25 Jul 2022 09:38:35 -0700
From:   "Asutosh Das (asd)" <quic_asutoshd@...cinc.com>
To:     Avri Altman <Avri.Altman@....com>, Can Guo <quic_cang@...cinc.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
        "quic_ziqichen@...cinc.com" <quic_ziqichen@...cinc.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>
CC:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Daejun Park <daejun7.park@...sung.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

On 7/23/2022 9:07 PM, Avri Altman wrote:
>> @@ -2558,7 +2587,8 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct
>> ufshcd_lrb *lrbp, u8 upiu_flags)
>>                                  UPIU_TRANSACTION_COMMAND, upiu_flags,
>>                                  lrbp->lun, lrbp->task_tag);
>>          ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
>> -                               UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);
>> +                               UPIU_COMMAND_SET_TYPE_SCSI |
>> +                               (lrbp->hw_queue_id << 4), 0, 0, 0);
> This is fine, as long as we have 16 queues or less.
> Otherwise, we need to fill the EXT_IID as well (only if bEXTIIDEn = 1).
> 
Yes, correct. Will add the code for EXT_IID in the next version.

> Also, don't we need to do this for query commands as well?
> Or at least add a comment that the queue id for query command is 0.
> 
Query commands would use the reserved queue whose id = 0.
I agree a comment should be added detailing this.
Will add in the next version.

> Thanks,
> Avri