linux-kernel - Re: AMD IOMMU + SME + amdgpu regression

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Date:   Wed, 15 Jul 2020 11:17:20 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
Cc:     Joerg Roedel <jroedel@...e.de>, Andy Gross <agross@...nel.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Drake <drake@...lessm.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Christoph Hellwig <hch@....de>,
        Heiko Stuebner <heiko@...ech.de>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jonathan.derrick@...el.com, Jonathan Hunter <jonathanh@...dia.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        David Rientjes <rientjes@...gle.com>,
        Rob Clark <robdclark@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        virtualization@...ts.linux-foundation.org,
        Will Deacon <will@...nel.org>
Subject: Re: AMD IOMMU + SME + amdgpu regression

On Mon, Jun 22, 2020 at 11:30:04AM -0400, Alex Xu (Hello71) wrote:
> Yes, it works with SME off with dbed452a078 ("dma-pool: decouple 
> DMA_REMAP from DMA_COHERENT_POOL") applied.

Okay, I can reproduce the problem on my Ryzen System, and the boot log
shows various warnings/bugs from the amdgpu driver. I think this should
be looked at by the AMDGPU folks first, as I didn't really got far
looking into the GPU drivers code.

Regards,

	Joerg