Re: [PATCH 2/2] arm64: dts: qcom: hamoa: Reserve low IOVA range for Iris

[Daniel J Blueman]

On Tue, 2 Jun 2026 at 18:27, Bryan O'Donoghue <bod@xxxxxxxxxx> wrote:
>
> On 01/06/2026 05:13, Daniel J Blueman wrote:
> > On X1-family hamoa platforms, Iris DMA below IOVA 0x25800000 (600MB)
> > triggers unhandled SMMU page faults
>
> How do we know that is a correct address - does it come from qcom
> documentation or trial and error ?

@Vikash, beyond your comment I linked in the patch [1] kindly cite a
source for the different stream-ID <600MB behaviour, and share
specifics, eg if silicon, firmware, or driver and constraint, defect
or otherwise, so I can include a definitive description.

Also good to know if my workaround is good for long-term, or on the
other hand handling streams <600MB is important/useful.

Thanks,
  Dan

[1] https://github.com/qualcomm-linux/kernel-topics/issues/1157#issuecomment-4458933574

--
Daniel J Blueman