From: "Javier González" <javier.gonz@samsung.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <kbusch@kernel.org>,
Dmitry Monakhov <dmtrmonakhov@yandex-team.ru>,
<linux-kernel@vger.kernel.org>, <linux-nvme@lists.infradead.org>,
<Chaitanya.Kulkarni@wdc.com>
Subject: Re: [PATCH 1/1] nvme-pci: add the DISABLE_WRITE_ZEROES quirk for a Samsung PM1725a
Date: Thu, 8 Apr 2021 20:15:53 +0200 [thread overview]
Message-ID: <20210408181553.jlqsq664av2vs65u@mpHalley.localdomain> (raw)
In-Reply-To: <20210408121538.GA12948@lst.de>
On 08.04.2021 14:15, Christoph Hellwig wrote:
>On Thu, Apr 08, 2021 at 12:30:16PM +0200, Javier González wrote:
>>>> Aligning to MDTS is our current behavior, although all kernels up to
>>>> 5.11 had a bug in the calculation.
>>>
>>> I see. Let me check internally and see what's going on with
>>> write-zeroes on this model.
>>
>> We still need to confirm, but it seems like MDTS for write-zeroes is
>> reported wrong in the FW that Dmitry is using. We can at least reproduce
>> it.
>>
>> Would it be a possibility to add quirk infrastructure to hardcode MDTS
>> for FW versions prior TP4040?
>>
>> Another possibility is to add quirks to the TP4040 support patches to
>> enable this - it might also help reduce the list of models currently
>> blacklisted for write-zeroes.
>
>I'm not sure I understand you. Before TP4040 there is only the MDTS,
>which only applies to data transfer commands, although we also
>"volunarily" apply it to Write Zeroes. If MDTS is wrong this would
>also affect normal I/O, so we really either need a firmware update
>or a quirk. Or is the Write Zeroes limit even smaller than MTDS?
The latter. The Write Zeroes limit is smaller than MDTS.
>I'd rather not add another quirk with a specific limit in that case,
>as well grow way too many of those.
This is what I had in mind - a structure with the quirks that would set
the write zeroes limit for the cases prior to TP4040 and where this is
lower than MDTS. But fair enough; I can see how painful it can be to
maintain this.
>TP4040 is the way to go for that case.
I agree TP4040 is the way to move forward.
Here I have one question: How do you envision adding support for FW
updates that add TP4040 support (or fix MDTS) with regards with existing
quirks.
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next prev parent reply other threads:[~2021-04-08 18:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1615377076-3251-1-git-send-email-dmtrmonakhov@yandex-team.ru>
2021-03-10 13:21 ` [PATCH 1/1] nvme-pci: add the DISABLE_WRITE_ZEROES quirk for a Samsung PM1725a Christoph Hellwig
2021-03-10 13:41 ` Christoph Hellwig
2021-03-10 20:00 ` Keith Busch
2021-03-11 10:47 ` Christoph Hellwig
[not found] ` <CGME20210323083750eucas1p14d21230ac758194d854ca336caf7f3f2@eucas1p1.samsung.com>
2021-03-23 8:37 ` Javier González
2021-03-23 12:31 ` Christoph Hellwig
2021-03-23 12:43 ` Javier González
2021-04-08 10:30 ` Javier González
2021-04-08 12:15 ` Christoph Hellwig
2021-04-08 18:15 ` Javier González [this message]
2021-03-11 10:28 ` Dmitry Monakhov
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