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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Tue, 27 Aug 2019 16:45:20 +0900
Message-ID: <CAK7LNATYOLEboUTO4qPx2z7cqwDrHBO1HFHG8VzZEJ15STv+nw@mail.gmail.com>
Subject: Re: [PATCH v2 2/2] dma-contiguous: Use fallback alloc_pages for
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To:     Christoph Hellwig <hch@lst.de>
Cc:     Nicolin Chen <nicoleotsuka@gmail.com>,
        linux-mmc <linux-mmc@vger.kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>, vdumpa@nvidia.com,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
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        Max Filippov <jcmvbkbc@gmail.com>,
        Joerg Roedel <joro@8bytes.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Tony Lindgren <tony@atomide.com>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Thierry Reding <treding@nvidia.com>,
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On Mon, Aug 26, 2019 at 4:33 PM Christoph Hellwig <hch@lst.de> wrote:
>
> On Mon, Aug 26, 2019 at 11:05:00AM +0900, Masahiro Yamada wrote:
> > This is included in v5.3-rc6
> > so I tested it.
>
> So there is no allocation failure, but you get I/O errors later?

Right.

>
> Does the device use a device-private CMA area?

Not sure.
My driver is drivers/mmc/host/sdhci-cadence.c
It reuses routines in drivers/mmc/host/sdhci.c


>  Does it work with Linux
> 5.2 if CONFIG_DMA_CMA is disabled?

No.
5.2 + disable CONFIG_DMA_CMA
failed in the same way.


-- 
Best Regards
Masahiro Yamada