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

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Message-ID: <6c4efbc1-baa0-178e-15d2-7ed8bbde75da@acm.org>
Date:   Sat, 23 Jul 2022 20:14:33 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Avri Altman <Avri.Altman@....com>, Can Guo <quic_cang@...cinc.com>,
        "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_asutoshd@...cinc.com" <quic_asutoshd@...cinc.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 7/23/22 08:26, Avri Altman wrote:
>> +
>> +               /* sqen|size|cqid */
>> +               ufsmcq_writel(hba, (1 << 31) | qsize | (i << 16),
>> +                             MCQ_CFG_n(REG_SQATTR, i));
> So there is a 1X1 SQ-CQ topology.
> Isn't that should be configurable?

Hi Avri,

I'm in favor of starting with a 1:1 SQ:CQ mapping and only adding 
support for other approaches if there is a very good reason.

Thanks,

Bart.