linux-kernel - RE: Re: [PATCH v18 3/3] scsi: ufs: Prepare HPB read for cached sub-region

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Date:   Fri, 15 Jan 2021 16:59:35 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     Can Guo <cang@...eaurora.org>,
        Daejun Park <daejun7.park@...sung.com>
CC:     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>,
        "bvanassche@....org" <bvanassche@....org>,
        "huobean@...il.com" <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "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>,
        Adel Choi <adel.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>,
        SEUNGUK SHIN <seunguk.shin@...sung.com>
Subject: RE: Re: [PATCH v18 3/3] scsi: ufs: Prepare HPB read for cached
 sub-region

Hi Can Guo,

> 
> On 2021-01-13 09:36, Daejun Park wrote:
> > Hi Can Guo,
> > 
> >> > +static void
> >> > +ufshpb_set_hpb_read_to_upiu(struct ufshpb_lu *hpb, struct ufshcd_lrb
> >> > *lrbp,
> >> > +				  u32 lpn, u64 ppn,  unsigned int transfer_len)
> >> > +{
> >> > +	unsigned char *cdb = lrbp->ucd_req_ptr->sc.cdb;
> >> > +
> >> > +	cdb[0] = UFSHPB_READ;
> >> 
> >> You are only replacing opcode in cdb[0], but 
> >> ufshcd_add_command_trace()
> >> is
> >> counting on lrbp->cmd->cmnd. This will lead to wrong opcode recorded 
> >> by
> >> UFS ftrace.
> >> 
> > You're comment is good point for improving this patch. But there is no
> > "case" for HPB read (0xF8) in ufshcd_add_command_trace().
> > So I will add codes to support tracing HPB read command in
> > ufshcd_add_command_trace() on next patch.
> > 
> 
> It is not just about ftrace. If HPB READ cmd fails with sense key infos.
> When SCSI layer prints the cmd, it still prints the READ(10) CDB, which 
> is
> misleading.

Oh, thanks. I will fix this problem on next patch.


Daejun