linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: fix i915 running as dom0 under Xen

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Date:   Thu, 2 Feb 2017 10:55:31 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Juergen Gross <jgross@...e.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        airlied@...ux.ie, daniel.vetter@...el.com, konrad.wilk@...cle.com
Subject: Re: [Intel-gfx] [PATCH] drm/i915: fix i915 running as dom0 under Xen

On Thu, Feb 02, 2017 at 11:48:21AM +0100, Daniel Vetter wrote:
> On Thu, Feb 02, 2017 at 10:47:11AM +0100, Juergen Gross wrote:
> > Commit 920cf4194954ec ("drm/i915: Introduce an internal allocator for
> > disposable private objects") introduced a regression for the kernel
> > running as Xen dom0: when switching to graphics mode a GPU HANG
> > occurred.
> > 
> > Reason seems to be a missing adaption similar to that done in
> > commit 7453c549f5f648 ("swiotlb: Export swiotlb_max_segment to users")
> > to i915_gem_object_get_pages_internal().
> > 
> > So limit the maximum page order to be used according to the maximum
> > swiotlb segment size instead to the complete swiotlb size.
> > 
> > Signed-off-by: Juergen Gross <jgross@...e.com>
> Fixes: 920cf4194954 ("drm/i915: Introduce an internal allocator for disposable private objects")
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
> Cc: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: intel-gfx@...ts.freedesktop.org
> Cc: <drm-intel-fixes@...ts.freedesktop.org> # v4.10-rc1+
> 
> We have a nice script for these :-)

Pffifle. 7453c549f5f648 allowed Xen to change it and silently conflicted
with those that already used the previous limits, which didn't land in
our tree until v4.10-rc3.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre