linux-kernel - Re: [PATCH] x86, aperture: Check for GART before accessing GART registers

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Date:	Thu, 2 Apr 2015 12:01:35 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, bp@...e.de, bhelgaas@...gle.com,
	linux-kernel@...r.kernel.org, Suravee.Suthikulpanit@....com,
	joro@...tes.org
Subject: Re: [PATCH] x86, aperture: Check for GART before accessing GART
 registers


* Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com> wrote:

> GART registers are not present in newer processors (Fam15h, Model 10h
> and later). So, avoid accesses to GART registers in PCI config
> space by returning early in early_gart_iommu_check() and
> gart_iommu_hole_init() if GART is not available.

In what fashion did this problem manifest itself on real systems?

Thanks,

	Ingo
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