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From: Kai-Heng Feng <kai.heng.feng@canonical.com>
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
Date: Thu, 2 Jul 2020 20:04:20 +0800	[thread overview]
Message-ID: <546DB0FA-FDEB-4FD1-93CD-AA5474B5F0DD@canonical.com> (raw)

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.

[1] https://gitlab.freedesktop.org/drm/amd/-/issues/1204

Kai-Heng
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             reply	other threads:[~2020-07-02 12:04 UTC|newest]

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

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