linux-kernel - Re: [PATCH v31 2/4] scsi: ufs: L2P map management for HPB read

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Date:   Tue, 23 Mar 2021 12:22:28 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Bean Huo <huobean@...il.com>
Cc:     daejun7.park@...sung.com, Greg KH <gregkh@...uxfoundation.org>,
        avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, asutoshd@...eaurora.org,
        stanley.chu@...iatek.com, bvanassche@....org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        JinHwan Park <jh.i.park@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        Dukhyun Kwon <d_hyun.kwon@...sung.com>,
        Keoseong Park <keosung.park@...sung.com>,
        Jaemyung Lee <jaemyung.lee@...sung.com>,
        Jieon Seol <jieon.seol@...sung.com>
Subject: Re: [PATCH v31 2/4] scsi: ufs: L2P map management for HPB read

On 2021-03-22 17:11, Bean Huo wrote:
> On Mon, 2021-03-22 at 15:54 +0900, Daejun Park wrote:
>> +       switch (rsp_field->hpb_op) {
>> 
>> +       case HPB_RSP_REQ_REGION_UPDATE:
>> 
>> +               if (data_seg_len != DEV_DATA_SEG_LEN)
>> 
>> +                       dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
>> 
>> +                                "%s: data seg length is not
>> same.\n",
>> 
>> +                                __func__);
>> 
>> +               ufshpb_rsp_req_region_update(hpb, rsp_field);
>> 
>> +               break;
>> 
>> +       case HPB_RSP_DEV_RESET:
>> 
>> +               dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
>> 
>> +                        "UFS device lost HPB information during
>> PM.\n");
>> 
>> +               break;
> 
> Hi Deajun,
> This series looks good to me. Just here I have one question. You didn't
> handle HPB_RSP_DEV_RESET, just a warning.  Based on your SS UFS, how to
> handle HPB_RSP_DEV_RESET from the host side? Do you think we shoud
> reset host side HPB entry as well or what else?
> 
> 
> Bean

Same question here - I am still collecting feedbacks from flash vendors 
about
what is recommanded host behavior on reception of HPB Op code 0x2, since 
it
is not cleared defined in HPB2.0 specs.

Can Guo.