linux-kernel - RE: Re: [PATCH v35 3/4] scsi: ufs: Prepare HPB read for cached sub-region

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Date:   Fri, 04 Jun 2021 10:11:24 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     Bart Van Assche <bvanassche@....org>,
        Daejun Park <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>,
        "huobean@...il.com" <huobean@...il.com>,
        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>,
        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: Re: [PATCH v35 3/4] scsi: ufs: Prepare HPB read for cached
 sub-region

Hi Bart,

>> +static void
>> +ufshpb_set_hpb_read_to_upiu(struct ufshpb_lu *hpb, struct ufshcd_lrb *lrbp,
>> +                            u32 lpn, u64 ppn, u8 transfer_len)
>> +{
>> +        unsigned char *cdb = lrbp->cmd->cmnd;
>> +
>> +        cdb[0] = UFSHPB_READ;
>> +
>> +        /* ppn value is stored as big-endian in the host memory */
> 
>I think that that comment means that the type of the 'ppn' argument
>should be changed from 'u64' into __be64.

OK, I will change it.

> 
>> +        memcpy(&cdb[6], &ppn, sizeof(__be64));
>> +        cdb[14] = transfer_len;
>> +
>> +        lrbp->cmd->cmd_len = UFS_CDB_SIZE;
>> +}
>> +
>> +/*
>> + * This function will set up HPB read command using host-side L2P map data.
>> + * In HPB v1.0, maximum size of HPB read command is 4KB.
>> + */
>> +void ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>> +{
>[ ... ]
>> +
>> +        ufshpb_set_hpb_read_to_upiu(hpb, lrbp, lpn, ppn, transfer_len);
> 
>'transfer_len' has type int and is truncated to type 'u8' when passed as
>an argument to ufshpb_set_hpb_read_to_upiu(). Please handle transfer_len
>values >= 256 properly.

Before entering the function, ufshpb_is_supported_chunk() checks whether
transfer_len <= hpb->pre_req_max_tr_len which is set to
HPB_MULTI_CHUNK_HIGH (128) on initalization.

Thanks,
Daejun