linux-kernel - Re: [PATCH v1 1/3] scsi: ufs: add write booster feature support

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Date:   Sun, 21 Jun 2020 00:55:39 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     Rob Clark <robdclark@...il.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Bean Huo <beanhuo@...ron.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Colin Ian King <colin.king@...onical.com>,
        Bart Van Assche <bvanassche@....org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] scsi: ufs: add write booster feature support

On Sun 21 Jun 00:40 PDT 2020, Avri Altman wrote:

>  
> > 
> > On Wed, Apr 8, 2020 at 3:00 PM Asutosh Das <asutoshd@...eaurora.org>
> > wrote:
> > >
> > > The write performance of TLC NAND is considerably
> > > lower than SLC NAND. Using SLC NAND as a WriteBooster
> > > Buffer enables the write request to be processed with
> > > lower latency and improves the overall write performance.
> > >
> > > Adds support for shared-buffer mode WriteBooster.
> > >
> > > WriteBooster enable: SW enables it when clocks are
> > > scaled up, thus it's enabled only in high load conditions.
> > >
> > > WriteBooster disable: SW will disable the feature,
> > > when clocks are scaled down. Thus writes would go as normal
> > > writes.
> > 
> > btw, in v5.8-rc1 (plus handful of remaining patches for lenovo c630
> > laptop (sdm850)), I'm seeing a lot of:
> > 
> >   ufshcd-qcom 1d84000.ufshc: ufshcd_query_flag: Sending flag query for
> > idn 14 failed, err = 253
> >   ufshcd-qcom 1d84000.ufshc: ufshcd_query_flag: Sending flag query for
> > idn 14 failed, err = 253
> >   ufshcd-qcom 1d84000.ufshc: ufshcd_query_flag_retry: query attribute,
> > opcode 6, idn 14, failed with error 253 after 3 retires
> >   ufshcd-qcom 1d84000.ufshc: ufshcd_wb_ctrl write booster enable failed 253
> > 
> > and at least subjectively, compiling mesa seems slower, which seems
> > like it might be related?
> This looks like a device issue to be taken with the flash vendor:

There's no way for a end-user to file a bug report with the flash vendor
on a device bought from an OEM and even if they would accept the bug
report they wouldn't re-provision the flash in an shipped device.

So you will have to work around this in the driver.

Regards,
Bjorn

> The device reports that it supports wd, but returns inalid idn for flag 0xe...
> 
> Thanks,
> Avri