linux-kernel - RE: [PATCH v4 5/6] scsi: ufshpb: Add handing of device reset HPB regions Infos in HPB device mode

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Date:   Tue, 10 May 2022 10:02:55 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     Bean Huo <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        Daejun Park <daejun7.park@...sung.com>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "powen.kao@...iatek.com" <powen.kao@...iatek.com>,
        Keoseong Park <keosung.park@...sung.com>,
        cpgsproxy3 <cpgsproxy3@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 5/6] scsi: ufshpb: Add handing of device reset HPB
 regions Infos in HPB device mode

Hi Bean Huo,
 
>In UFS HPB Spec JESD220-3A,
> 
>"5.8. Active and inactive information upon power cycle
>...
>When the device is powered off by the host, the device may restore L2P map data
>upon power up or build from the host’s HPB READ command. In case device powered
>up and lost HPB information, device can signal to the host through HPB Sense data,
>by setting HPB Operation as ‘2’ which will inform the host that device reset HPB
>information."
> 
>Therefore, for HPB device control mode, if the UFS device is reset via the RST_N
>pin, the active region information in the device will be reset. If the host side
>receives this notification from the device side, it is recommended to inactivate
>all active regions in the host's HPB cache.
> 
>Signed-off-by: Bean Huo <beanhuo@...ron.com>
>Reviewed-by: Keoseong Park <keosung.park@...sung.com>
 
Here is my reviewed-by tag.
Reviewed-by: Daejun Park <daejun7.park@...sung.com>
 
Thanks,
Daejun