linux-kernel - RE: [PATCH v19 2/3] scsi: ufs: L2P map management for HPB read

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Message-ID: <DM6PR04MB65759D6418E8FCD4B0BD6236FCB29@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Fri, 5 Feb 2021 11:42:09 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <huobean@...il.com>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        ALIM AKHTAR <alim.akhtar@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>,
        SEUNGUK SHIN <seunguk.shin@...sung.com>
Subject: RE: [PATCH v19 2/3] scsi: ufs: L2P map management for HPB read

> Hi Daejun
> 
> Thanks for your hard-working on the HPB driver.
> 
> I found you didn't take into account of allocation Length of the last
> sub-region of the last region.
> 
> UFS HPB spec:
> 
> "If the requested field of the HPB Region or HPB Sub-Region is out of
> range, then the device shall terminate the command by sending RESPONSE
> UPIU with CHECK CONDITION status, with the SENSE KEY set to ILLEGAL
> REQUEST, and the additional sense code set to INVALID FIELD IN CDB"
You don't need to worry about setting invalid ppn to HPB-READ command - 
you'll never get a read request for those LBAs.

Say all subregions are 16MB and the last subregion of the last region is 10MB.
Keep all sizes the same - 16MB, and the ppn of the last subregion contain some invalid data.
But you'll never get a read request for those LBAs anyway - they don't exist,
so you'll never get to use those invalid ppns.

Thanks,
Avri