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

2020-09-04 Thread Miles Chen
On Fri, 2020-09-04 at 11:42 +0200, Joerg Roedel wrote: > 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 reg

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

2020-09-04 Thread Joerg Roedel
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. > >

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

2020-08-31 Thread Miles Chen
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: