linux-kernel - Re: [PATCH] dma-direct: take dma-ranges/offsets into account in resource mapping

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Message-ID: <20220622111641.GA27618@lst.de>
Date:   Wed, 22 Jun 2022 13:16:41 +0200
From:   Christoph Hellwig <hch@....de>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org,
        Srujana Challa <schalla@...vell.com>,
        Arnaud Ebalard <arno@...isbad.org>,
        Boris Brezillon <bbrezillon@...nel.org>,
        linux-crypto@...r.kernel.org, Vinod Koul <vkoul@...nel.org>,
        dmaengine@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Li Yang <leoyang.li@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-renesas-soc@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
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        Tomasz Figa <tfiga@...omium.org>,
        Oded Gabbay <ogabbay@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org,
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        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>, ntb@...ts.linux.dev,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-direct: take dma-ranges/offsets into account in
 resource mapping

I'd really like to hear something from the driver maintainers.  The
cod change itself looks fine, we just need to make sure it does not
break any driver assumptions.

And I think at least for the PCIe P2P and NTB cases I fear it might
break them.  The proper logic for those is in the p2p helpers, but
it seems like not everyone is using them.