[lkml]   [2020]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/6] arm64: dts: qcom: sm8250: add apps_smmu node
On Mon 25 May 04:53 PDT 2020, Jonathan Marek wrote:
> I guess the commit message is ambiguous, that's not what I meant. Is "Now
> that the kernel initializes the iommu, the bypass mappings set by the
> bootloader are cleared. Adding the iommus property is required so that new
> mappings are created for UFS." better?

This looks better, but it's actually not a bypass mapping that we
inherit from the bootloader, it's the stream mapping pointing to a
disabled (~ARM_SMMU_SCTLR_M) context bank. So when we wipe the stream
mappings we will fault on the unmatched stream - which secure world
"handles" for us...

As such, I think you should replace "bypass" with "stream".


 \ /
  Last update: 2020-05-29 04:50    [W:0.109 / U:1.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site