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

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Date:   Sun, 21 Jun 2020 12:50:27 -0500
From:   Steev Klimaszewski <steev@...i.org>
To:     Rob Clark <robdclark@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Avri Altman <Avri.Altman@....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 6/21/20 11:50 AM, Rob Clark wrote:
> 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.
> oh, ugg.. well I think these msgs from dmesg identify the part if we
> end up needing to use a denylist:
>
> scsi 0:0:0:49488: Well-known LUN    SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
> scsi 0:0:0:49476: Well-known LUN    SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
> scsi 0:0:0:49456: Well-known LUN    SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
> scsi 0:0:0:0: Direct-Access     SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
> scsi 0:0:0:1: Direct-Access     SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
> sd 0:0:0:0: [sda] 29765632 4096-byte logical blocks: (122 GB/114 GiB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 00 32 00 10
> sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, supports
> DPO and FUA
> sd 0:0:0:0: [sda] Optimal transfer size 786432 bytes
> scsi 0:0:0:2: Direct-Access     SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
> scsi 0:0:0:3: Direct-Access     SKhynix  H28S8Q302CMR     A102 PQ: 0 ANSI: 6
>
>
> (otoh I guess the driver could just notice that writeboost keeps
> failing and stop trying to use it)
>
> BR,
> -R


FWIW, I see this on my c630 as well, but my LUN shows up as


scsi 0:0:0:49488: Well-known LUN    SAMSUNG  KLUDG4U1EA-B0C1   0500 PQ:
0 ANSI: 6