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

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Date:   Wed, 13 Jan 2021 10:36:33 +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,

> > +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