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

[Steev Klimaszewski]

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 LUNÂÂÂ SAMSUNGÂ KLUDG4U1EA-B0C1ÂÂ 0500 PQ:
0 ANSI: 6