From: Christoph Hellwig <hch@lst.de>
To: Meelis Roos <mroos@linux.ee>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>,
iommu@lists.linux-foundation.org
Subject: Re: 4.19-rc3: IOMMU PT warnings: WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:4065 __alloc_pages_slowpath+0xb7b/0xcd0
Date: Mon, 10 Sep 2018 15:23:04 +0200 [thread overview]
Message-ID: <20180910132304.GA20244@lst.de> (raw)
In-Reply-To: <alpine.LRH.2.21.1809101111040.31938@math.ut.ee>
On Mon, Sep 10, 2018 at 11:16:12AM +0300, Meelis Roos wrote:
> In 4.19-rc1, I found that to keep Intel integrated graphics working when
> VT-d is on, I need to have IOMMU passthough on or GPU init would fail
> with DMAR error and the screen would display static gibberish. So I
> turned IOMMU PT on by default in kernel config. It worked, also in rc2.
>
> Now with rc3, it still works but I get some warning splats in dmesg
> about IOMMU passthrough:
Any chance you could bisect this down to a specific commit? For
a start it might be worth if it is reproducable with:
git://git.infradead.org/users/hch/dma-mapping.git dma-mapping-4.19-2
which were the only dma-mapping changes post -rc2.
next prev parent reply other threads:[~2018-09-10 13:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-10 8:16 4.19-rc3: IOMMU PT warnings: WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:4065 __alloc_pages_slowpath+0xb7b/0xcd0 Meelis Roos
2018-09-10 8:16 ` Meelis Roos
2018-09-10 13:23 ` Christoph Hellwig [this message]
[not found] ` <20180910132304.GA20244-jcswGhMUV9g@public.gmane.org>
2018-09-10 13:26 ` Robin Murphy
2018-09-10 13:26 ` Robin Murphy
[not found] ` <e3f0e78a-3e3d-aae7-2588-599184dee534-5wv7dgnIgG8@public.gmane.org>
2018-09-10 14:07 ` Meelis Roos
2018-09-10 14:07 ` Meelis Roos
2018-09-10 14:36 ` Robin Murphy
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