linux-kernel - Re: [PATCH v2 1/3] scsi: ufs: core: Introduce mcq ops to config cqid

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Message-ID: <1c182151-6e8c-5068-b38c-f8e842e6e13b@acm.org>
Date:   Tue, 30 May 2023 16:54:29 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Po-Wen Kao <powen.kao@...iatek.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     wsd_upstream@...iatek.com, peter.wang@...iatek.com,
        stanley.chu@...iatek.com, alice.chao@...iatek.com,
        naomi.chu@...iatek.com, chun-hung.wu@...iatek.com,
        cc.chou@...iatek.com, eddie.huang@...iatek.com
Subject: Re: [PATCH v2 1/3] scsi: ufs: core: Introduce mcq ops to config cqid

On 5/29/23 19:32, Po-Wen Kao wrote:
> MCQ sq/cq mapping is not just one for one, could many for one.
> This patch allow host driver to change the mapping, assign cqid
> for each hw queue.

What use case do you have in mind for associating multiple submission 
queues with a single completion queue?

No matter what the use case is, I think that which submission queues are 
associated with a completion queue is independent of the host driver and 
hence that such logic should exist in the UFS core instead of in a host 
driver.

Bart.