linux-kernel - Re: [PATCH v25 4/4] scsi: ufs: Add HPB 2.0 support

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Message-ID: <fb70bf48fab65474bf2f15a436852ccf9a3db026.camel@gmail.com>
Date:   Tue, 02 Mar 2021 13:49:47 +0100
From:   Bean Huo <huobean@...il.com>
To:     daejun7.park@...sung.com, Greg KH <gregkh@...uxfoundation.org>,
        "avri.altman@....com" <avri.altman@....com>,
        "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>,
        Javier Gonzalez <javier.gonz@...sung.com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        JinHwan Park <jh.i.park@...sung.com>,
        SEUNGUK SHIN <seunguk.shin@...sung.com>,
        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>
Subject: Re: [PATCH v25 4/4] scsi: ufs: Add HPB 2.0 support

On Fri, 2021-02-26 at 16:35 +0900, Daejun Park wrote:
> +static void ufshpb_set_unmap_cmd(unsigned char *cdb, struct
> ufshpb_region *rgn)
> +{
> +       cdb[0] = UFSHPB_WRITE_BUFFER;
> +       cdb[1] = rgn ? UFSHPB_WRITE_BUFFER_INACT_SINGLE_ID :
> +                         UFSHPB_WRITE_BUFFER_INACT_ALL_ID;

Here is wrong, 
Valid HPB Region is (0 ~ (Ceiling( Region size calculated by
bHPBRegionSize )- 1) ). how do you know the region==0 is not 
a single normal region?

Bean


> +       if (rgn)
> +               put_unaligned_be16(rgn->rgn_idx, &cdb[2]);
> +       cdb[9] = 0x00;
> +}