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Subject: RE: Re: [PATCH v18 3/3] scsi: ufs: Prepare HPB read for cached
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Sender: Daejun Park <daejun7.park@samsung.com>
From:   Daejun Park <daejun7.park@samsung.com>
To:     Can Guo <cang@codeaurora.org>,
        Daejun Park <daejun7.park@samsung.com>
CC:     Greg KH <gregkh@linuxfoundation.org>,
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        "stanley.chu@mediatek.com" <stanley.chu@mediatek.com>,
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        ALIM AKHTAR <alim.akhtar@samsung.com>,
        "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Sung-Jun Park <sungjun07.park@samsung.com>,
        yongmyung lee <ymhungry.lee@samsung.com>,
        Jinyoung CHOI <j-young.choi@samsung.com>,
        Adel Choi <adel.choi@samsung.com>,
        BoRam Shin <boram.shin@samsung.com>,
        SEUNGUK SHIN <seunguk.shin@samsung.com>
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Message-ID: <20210113013633epcms2p60b9dccaa405ff568a18d28b94089665b@epcms2p6>
Date:   Wed, 13 Jan 2021 10:36:33 +0900
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Precedence: bulk

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.

Thanks,
Daejun