From: David Woodhouse <dwmw2@infradead.org>
To: Jani Nikula <jani.nikula@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH v2 for -fixes] drm/i915: Disable stolen memory when DMAR is active
Date: Wed, 19 Mar 2014 20:51:45 +0000 [thread overview]
Message-ID: <1395262305.19007.41.camel@shinybook.infradead.org> (raw)
In-Reply-To: <1395147544-16984-1-git-send-email-jani.nikula@intel.com>
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On Tue, 2014-03-18 at 14:59 +0200, Jani Nikula wrote:
> From: Chris Wilson <chris@chris-wilson.co.uk>
>
> We have reports of heavy screen corruption if we try to use the stolen
> memory reserved by the BIOS whilst the DMA-Remapper is active. This
> quirk may be only specific to a few machines or BIOSes, but first lets
> apply the big hammer and always disable use of stolen memory when DMAR
> is active.
>
> v2 by Jani: Rebase on -fixes, only look at intel_iommu_gfx_mapped.
Perhaps this (and all similar workarounds) should be predicated on
i915_preliminary_hw_support? When people are using the Linux kernel for
chipset validation, we sure as hell don't want to silently disable this
stuff and let them think it's working when it's not.
--
dwmw2
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next prev parent reply other threads:[~2014-03-19 20:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-28 12:14 [PATCH] drm/i915: Disable stolen memory when DMAR is active Chris Wilson
2014-03-05 15:17 ` Daniel Vetter
2014-03-05 15:32 ` Chris Wilson
2014-03-05 17:39 ` Daniel Vetter
2014-03-14 13:10 ` Jani Nikula
2014-03-18 12:59 ` [PATCH v2 for -fixes] " Jani Nikula
2014-03-18 16:48 ` Daniel Vetter
2014-03-18 16:50 ` Daniel Vetter
2014-03-19 9:07 ` Jani Nikula
2014-03-19 20:51 ` David Woodhouse [this message]
2014-03-20 7:36 ` Jani Nikula
2014-03-20 7:49 ` David Woodhouse
2014-03-20 9:23 ` Jani Nikula
2014-03-20 9:45 ` Daniel Vetter
2014-03-20 10:21 ` David Woodhouse
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