linux-kernel - Re: [PATCH v1 3/3] scsi: ufs: Utilize Transfer Request List Completion Notification Register

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Message-ID: <88dc0251ee98aee5af2217f5d864f0a893dbdef8.camel@gmail.com>
Date:   Mon, 31 May 2021 18:05:24 +0200
From:   Bean Huo <huobean@...il.com>
To:     Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com
Cc:     Stanley Chu <stanley.chu@...iatek.com>,
        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>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Satya Tangirala <satyat@...gle.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Caleb Connolly <caleb@...nolly.tech>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 3/3] scsi: ufs: Utilize Transfer Request List
 Completion Notification Register

On Mon, 2021-05-24 at 01:36 -0700, Can Guo wrote:
> By reading the UTP Transfer Request List Completion Notification
> Register,
> 
> which is added in UFSHCI Ver 3.0, SW can easily get the compeleted
> transfer
> 
> requests. Thus, SW can get rid of host lock, which is used to
> synchronize
> 
> the tr_doorbell and outstanding_reqs, on transfer requests dispatch
> and
> 
> completion paths. This can further benefit random read/write
> performance.
> 
> 
> 
> Cc: Stanley Chu <stanley.chu@...iatek.com>
> 
> Co-developed-by: Asutosh Das <asutoshd@...eaurora.org>
> 
> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>

Reviewed-by: Bean Huo <beanhuo@...ron.com>