[PATCH v5] iommu/mediatek: check 4GB mode by reading infracfg

Joerg Roedel joro at 8bytes.org
Fri Sep 4 05:42:33 EDT 2020

On Mon, Aug 31, 2020 at 06:56:39PM +0800, Miles Chen wrote:
> In previous discussion [1] and [2], we found that it is risky to
> use max_pfn or totalram_pages to tell if 4GB mode is enabled.
> Check 4GB mode by reading infracfg register, remove the usage
> of the un-exported symbol max_pfn.
> This is a step towards building mtk_iommu as a kernel module.
> [1] https://lore.kernel.org/lkml/20200603161132.2441-1-miles.chen@mediatek.com/
> [2] https://lore.kernel.org/lkml/20200604080120.2628-1-miles.chen@mediatek.com/
> [3] https://lore.kernel.org/lkml/20200715205120.GA778876@bogus/
> Cc: Mike Rapoport <rppt at linux.ibm.com>
> Cc: David Hildenbrand <david at redhat.com>
> Cc: Yong Wu <yong.wu at mediatek.com>
> Cc: Yingjoe Chen <yingjoe.chen at mediatek.com>
> Cc: Christoph Hellwig <hch at lst.de>
> Cc: Rob Herring <robh at kernel.org>
> Cc: Matthias Brugger <matthias.bgg at gmail.com>
> Signed-off-by: Miles Chen <miles.chen at mediatek.com>

You forgot to add the tags here from v4, at least Matthias' Reviewed-by
is missing. Please add the missing tags and resend.


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