linux-kernel - Re: [PATCH v2 01/26] dma-direct: take dma-ranges/offsets into account in resource mapping

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Message-ID: <20220512232811.6epllnb3ivb7vegq@mobilestation>
Date:   Fri, 13 May 2022 02:28:11 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        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>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH v2 01/26] dma-direct: take dma-ranges/offsets into
 account in resource mapping

On Mon, May 09, 2022 at 08:15:52AM +0200, Christoph Hellwig wrote:
> So I think the big problem pointed out by Robin is that existing DTs
> might not take this into account. 

I'd say that the biggest problem isn't in the DT part but in the
drivers using the dma_map_resource() method since they don't expect
the non-uniform DMA-direct mapping can be available.

> So I think we need to do a little
> research and at least Cc all maintainers and lists for relevant in-tree
> DTs for drivers that use dma_map_resource to discuss this.

Right. I'll send the next patchset revision out with all possibly
interested maintainers and lists in Cc of this patch.

-Sergey

>