From: "Bean Huo (beanhuo)" <beanhuo@micron.com>
To: Stanley Chu <stanley.chu@mediatek.com>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"avri.altman@wdc.com" <avri.altman@wdc.com>,
"alim.akhtar@samsung.com" <alim.akhtar@samsung.com>,
"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
"asutoshd@codeaurora.org" <asutoshd@codeaurora.org>
Cc: "cang@codeaurora.org" <cang@codeaurora.org>,
"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
"bvanassche@acm.org" <bvanassche@acm.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kuohong.wang@mediatek.com" <kuohong.wang@mediatek.com>,
"peter.wang@mediatek.com" <peter.wang@mediatek.com>,
"chun-hung.wu@mediatek.com" <chun-hung.wu@mediatek.com>,
"andy.teng@mediatek.com" <andy.teng@mediatek.com>
Subject: RE: [EXT] [PATCH v6 6/8] scsi: ufs: add LU Dedicated buffer mode support for WriteBooster
Date: Mon, 4 May 2020 19:11:04 +0000 [thread overview]
Message-ID: <BN7PR08MB56843594B62E0852386869EADBA60@BN7PR08MB5684.namprd08.prod.outlook.com> (raw)
In-Reply-To: <20200504145622.13895-7-stanley.chu@mediatek.com>
> 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>
next prev parent reply other threads:[~2020-05-04 19:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-04 14:56 [PATCH v6 0/8] scsi: ufs: support LU Dedicated buffer mode for WriteBooster Stanley Chu
2020-05-04 14:56 ` [PATCH v6 1/8] scsi: ufs: enable WriteBooster on some pre-3.1 UFS devices Stanley Chu
2020-05-04 14:56 ` [PATCH v6 2/8] scsi: ufs: introduce fixup_dev_quirks vops Stanley Chu
2020-05-04 14:56 ` [PATCH v6 3/8] scsi: ufs: export ufs_fixup_device_setup() function Stanley Chu
2020-05-04 14:56 ` [PATCH v6 4/8] scsi: ufs-mediatek: add fixup_dev_quirks vops Stanley Chu
2020-05-04 14:56 ` [PATCH v6 5/8] scsi: ufs: add "index" in parameter list of ufshcd_query_flag() Stanley Chu
2020-05-04 14:56 ` [PATCH v6 6/8] scsi: ufs: add LU Dedicated buffer mode support for WriteBooster Stanley Chu
2020-05-04 19:11 ` Bean Huo (beanhuo) [this message]
2020-05-04 14:56 ` [PATCH v6 7/8] scsi: ufs-mediatek: enable WriteBooster capability Stanley Chu
2020-05-04 14:56 ` [PATCH v6 8/8] scsi: ufs: cleanup WriteBooster feature Stanley Chu
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