linux-kernel - RE: [EXT] [PATCH v6 6/8] scsi: ufs: add LU Dedicated buffer mode support for WriteBooster

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Date:   Mon, 4 May 2020 19:11:04 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.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>,
        "avri.altman@....com" <avri.altman@....com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>
CC:     "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: [EXT] [PATCH v6 6/8] scsi: ufs: add LU Dedicated buffer mode
 support for WriteBooster

> From: Stanley Chu <stanley.chu@...iatek.com>
> Sent: Monday, May 4, 2020 4:56 PM
> To: linux-scsi@...r.kernel.org; martin.petersen@...cle.com;
> avri.altman@....com; alim.akhtar@...sung.com; jejb@...ux.ibm.com;
> asutoshd@...eaurora.org
> Cc: Bean Huo (beanhuo) <beanhuo@...ron.com>; cang@...eaurora.org;
> matthias.bgg@...il.com; bvanassche@....org; linux-
> mediatek@...ts.infradead.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; kuohong.wang@...iatek.com;
> peter.wang@...iatek.com; chun-hung.wu@...iatek.com;
> andy.teng@...iatek.com; Stanley Chu <stanley.chu@...iatek.com>
> Subject: [EXT] [PATCH v6 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>
Reviewed-by: Bean Huo <beanhuo@...ron.com>