linux-kernel - Re: swiotlb/caamjr regression (Was: [GIT PULL] (swiotlb) stable/for-linus-5.12)

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Message-ID: <20210617051232.GB27192@lst.de>
Date:   Thu, 17 Jun 2021 07:12:32 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dominique MARTINET <dominique.martinet@...ark-techno.com>
Cc:     Konrad Rzeszutek Wilk <konrad@...nok.org>,
        Jianxiong Gao <jxgao@...gle.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Horia Geantă <horia.geanta@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lukas Hartmann <lukas@...mn.com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Marc Orr <marcorr@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Peter Gonda <pgonda@...gle.com>
Subject: Re: swiotlb/caamjr regression (Was: [GIT PULL] (swiotlb)
 stable/for-linus-5.12)

On Thu, Jun 17, 2021 at 09:39:15AM +0900, Dominique MARTINET wrote:
> Konrad Rzeszutek Wilk wrote on Wed, Jun 16, 2021 at 08:27:39PM -0400:
> > Thank you for testing that - and this is a bummer indeed.
> 
> Hm, actually not that surprising if it was working without the offset
> adjustments and doing non-aligned mappings -- perhaps the nvme code just
> needs to round the offsets down instead of expecting swiotlb to do it?

It can't.  The whole point of the series was to keep the original offsets.