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From:   "Deucher, Alexander" <Alexander.Deucher@amd.com>
To:     Kai-Heng Feng <kai.heng.feng@canonical.com>,
        Joerg Roedel <jroedel@suse.de>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>
CC:     "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: RE: [BUG] "Pre-boot DMA Protection" makes AMDGPU stop working
Thread-Topic: [BUG] "Pre-boot DMA Protection" makes AMDGPU stop working
Thread-Index: AQHWUGjxeTZverwQ6kmRoYr5I/0L+qj0epvw
Date:   Thu, 2 Jul 2020 16:30:44 +0000
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[AMD Public Use]

> -----Original Message-----
> From: Kai-Heng Feng <kai.heng.feng@canonical.com>
> Sent: Thursday, July 2, 2020 8:04 AM
> To: Joerg Roedel <jroedel@suse.de>
> Cc: Deucher, Alexander <Alexander.Deucher@amd.com>;
> iommu@lists.linux-foundation.org; open list <linux-kernel@vger.kernel.org=
>
> Subject: [BUG] "Pre-boot DMA Protection" makes AMDGPU stop working
>=20
> Hi,
>=20
> A more detailed bug report can be found at [1].
>=20
> I have a AMD Renoir system that can't enter graphical session because the=
re
> are many IOMMU splat.
>=20
> Alex suggested to disable "Pre-boot DMA Protection", I can confirm once i=
t's
> disabled, AMDGPU starts working with IOMMU enabled.
> So raise the issue here because I have no knowledge on how to reset the
> IOMMU.

+ Suravee

This is part of MS's Secure Core initiative.  We are investigating how to p=
roperly handle this properly on Linux.  Stay tuned.

Alex

>=20
> [1]
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgitla
> b.freedesktop.org%2Fdrm%2Famd%2F-
> %2Fissues%2F1204&amp;data=3D02%7C01%7Calexander.deucher%40amd.com
> %7C60746a6fecf04a5e570908d81e8011c6%7C3dd8961fe4884e608e11a82d994
> e183d%7C0%7C0%7C637292882713301680&amp;sdata=3Dr6cj19Vc8N0%2FSmsb
> CAJva%2BabMD2b5r2lvPLIxZSacoY%3D&amp;reserved=3D0
>=20
> Kai-Heng