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

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Message-ID: <45495479-dc4e-4d89-8c0d-836df83ee18a@acm.org>
Date:   Thu, 2 Nov 2023 12:16:15 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     naomi.chu@...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>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Asutosh Das <quic_asutoshd@...cinc.com>,
        Can Guo <quic_cang@...cinc.com>
Cc:     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

On 11/1/23 22:24, naomi.chu@...iatek.com wrote:
> 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.

Reviewed-by: Bart Van Assche <bvanassche@....org>