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Date:   Mon, 22 Jun 2020 11:30:04 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Subject: Re: AMD IOMMU + SME + amdgpu regression
To:     Joerg Roedel <jroedel@suse.de>
Cc:     Andy Gross <agross@kernel.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
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        Gerald Schaefer <gerald.schaefer@de.ibm.com>,
        Christoph Hellwig <hch@lst.de>,
        Heiko Stuebner <heiko@sntech.de>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>,
        jonathan.derrick@intel.com, Jonathan Hunter <jonathanh@nvidia.com>,
        Joerg Roedel <joro@8bytes.org>, Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
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        Thierry Reding <thierry.reding@gmail.com>,
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        Will Deacon <will@kernel.org>
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Excerpts from Joerg Roedel's message of June 22, 2020 6:02 am:
> Hi Alex,
>=20
> On Thu, Jun 11, 2020 at 07:05:21PM -0400, Alex Xu (Hello71) wrote:
>> I am using an ASRock B450 Pro4 with Ryzen 1600 and ASUS RX 480. I don't=20
>> understand this code at all, but let me know what I can do to=20
>> troubleshoot.
>=20
> Does it boot without SME enabled?
>=20
>=20
> Regards,
>=20
> 	Joerg
>=20

Yes, it works with SME off with dbed452a078 ("dma-pool: decouple=20
DMA_REMAP from DMA_COHERENT_POOL") applied.