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SubjectRE: [EXT] [PATCH v6 6/8] scsi: ufs: add LU Dedicated buffer mode support for WriteBooster
Date
> From: Stanley Chu <stanley.chu@mediatek.com>
> Sent: Monday, May 4, 2020 4:56 PM
> To: linux-scsi@vger.kernel.org; martin.petersen@oracle.com;
> avri.altman@wdc.com; alim.akhtar@samsung.com; jejb@linux.ibm.com;
> asutoshd@codeaurora.org
> Cc: Bean Huo (beanhuo) <beanhuo@micron.com>; cang@codeaurora.org;
> matthias.bgg@gmail.com; bvanassche@acm.org; linux-
> mediatek@lists.infradead.org; linux-arm-kernel@lists.infradead.org; linux-
> kernel@vger.kernel.org; kuohong.wang@mediatek.com;
> peter.wang@mediatek.com; chun-hung.wu@mediatek.com;
> andy.teng@mediatek.com; Stanley Chu <stanley.chu@mediatek.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@mediatek.com>
> Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>

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