linux-kernel - Re: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1

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Message-ID: <yq1h6lv64cz.fsf@ca-mkp.ca.oracle.com>
Date:   Wed, 08 Nov 2023 21:35:53 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     <naomi.chu@...iatek.com>
Cc:     <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>,
        Bart Van Assche <bvanassche@....org>,
        "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>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Asutosh Das <quic_asutoshd@...cinc.com>,
        Can Guo <quic_cang@...cinc.com>, <wsd_upstream@...iatek.com>,
        <peter.wang@...iatek.com>, <casper.li@...iatek.com>,
        <powen.kao@...iatek.com>, <alice.chao@...iatek.com>,
        <chun-hung.wu@...iatek.com>, <cc.chou@...iatek.com>,
        <eddie.huang@...iatek.com>
Subject: Re: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to
 DeviceQueueDepth + 1


> The UFSHCI 4.0 specification mandates that there should always be at
> least one empty slot in each queue for distinguishing between full and
> empty states. Enlarge the `hwq->max_entries` to `DeviceQueueDepth +1`
> to allow UFSHCI 4.0 controllers to fully utilize MCQ queue slots.

Applied to 6.7/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering