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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
Date: Thu, 2 Jul 2020 16:30:44 +0000	[thread overview]
Message-ID: <MN2PR12MB448836EAEA1ECA6E821B8371F76D0@MN2PR12MB4488.namprd12.prod.outlook.com> (raw)
In-Reply-To: <546DB0FA-FDEB-4FD1-93CD-AA5474B5F0DD@canonical.com>

[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
> 
> Hi,
> 
> A more detailed bug report can be found at [1].
> 
> I have a AMD Renoir system that can't enter graphical session because there
> are many IOMMU splat.
> 
> Alex suggested to disable "Pre-boot DMA Protection", I can confirm once it'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 properly handle this properly on Linux.  Stay tuned.

Alex

> 
> [1]
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitla
> b.freedesktop.org%2Fdrm%2Famd%2F-
> %2Fissues%2F1204&amp;data=02%7C01%7Calexander.deucher%40amd.com
> %7C60746a6fecf04a5e570908d81e8011c6%7C3dd8961fe4884e608e11a82d994
> e183d%7C0%7C0%7C637292882713301680&amp;sdata=r6cj19Vc8N0%2FSmsb
> CAJva%2BabMD2b5r2lvPLIxZSacoY%3D&amp;reserved=0
> 
> Kai-Heng
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      reply	other threads:[~2020-07-02 16:30 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02 12:04 Kai-Heng Feng
2020-07-02 16:30 ` Deucher, Alexander [this message]

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