[DellEMC] DMA errors are seen when loading bullseye kernel

[aravindmani-1]

Why I did it

Following errors are seen continuously on SMBus controller when loading bullseye kernel.

[ 273.643046] DMAR: [DMA Write] Request device [00:12.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set
[ 273.785784] DMAR: DRHD: handling fault status reg 2
[ 273.844072] DMAR: [DMA Write] Request device [00:12.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set
[ 273.986804] DMAR: DRHD: handling fault status reg 2
[ 274.045101] DMAR: [DMA Write] Request device [00:12.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set
[ 274.187789] DMAR: DRHD: handling fault status reg 2

root@sonic:~# lspci -s 00:12.0 -vv
00:12.0 System peripheral: Intel Corporation Atom Processor C3000 Series SMBus Contoller - Host (rev 11)

Issue was not seen in buster.

How I did it

Modified platform specific installer.conf to turn off io_mmu

How to verify it

Check syslogs after making the changes in installer.conf

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)

[ingmaf]

Hi guys,

I'm still seeing those messages. Fresh install with:

SONiC Software Version: SONiC.master.160907-1f2ee7b72
Distribution: Debian 11.5
Kernel: 5.10.0-12-2-amd64
Build commit: 1f2ee7b72
Build date: Sat Oct 15 18:01:35 UTC 2022
Built by: AzDevOps@sonic-build-workers-0028R2

Platform: x86_64-dellemc_s5248f_c3538-r0
HwSKU: DellEMC-S5248f-P-25G
ASIC: broadcom
ASIC Count: 1
Serial Number: G9C10Q2
Model Number: 046MRJ
Hardware Revision: N/A
Uptime: 17:29:39 up  3:52,  1 user,  load average: 1.42, 1.57, 1.63
Date: Fri 21 Oct 2022 17:29:39

Any ideas?

Thanks in advance.
Regards.