linux-kernel - RE: [PATCH v5 6/8] scsi: ufs: add LU Dedicated buffer mode support for WriteBooster

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Message-ID: <SN6PR04MB4640EFE86AE1B59795249A2DFCA90@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Sun, 3 May 2020 14:26:51 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Stanley Chu <stanley.chu@...iatek.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>
CC:     "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuohong.wang@...iatek.com" <kuohong.wang@...iatek.com>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
        "andy.teng@...iatek.com" <andy.teng@...iatek.com>
Subject: RE: [PATCH v5 6/8] scsi: ufs: add LU Dedicated buffer mode support
 for WriteBooster

 
> According to UFS specification, there are two WriteBooster mode of
> operations: "LU dedicated buffer" mode and "shared buffer" mode.
> In the "LU dedicated buffer" mode, the WriteBooster Buffer is
> dedicated to a logical unit.
> 
> If the device supports the "LU dedicated buffer" mode, this mode is
> configured by setting bWriteBoosterBufferType to 00h. The logical
> unit WriteBooster Buffer size is configured by setting the
> dLUNumWriteBoosterBufferAllocUnits field of the related Unit
> Descriptor. Only a value greater than zero enables the WriteBooster
> feature in the logical unit.
> 
> Modify ufshcd_wb_probe() as above description to support LU Dedicated
> buffer mode.
> 
> Note that according to UFS 3.1 specification, the valid value of
> bDeviceMaxWriteBoosterLUs parameter in Geometry Descriptor is 1,
> which means at most one LUN can have WriteBooster buffer in "LU
> dedicated buffer mode". Therefore this patch supports only one
> LUN with WriteBooster enabled. All WriteBooster related sysfs nodes
> are specifically mapped to the LUN with WriteBooster enabled in
> LU Dedicated buffer mode.
> 
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
Reviewed-by: Avri Altman <avri.altman@....com>