[Bug 91127] Graphics problems with intel_iommu=on on Linux >= 3.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91127

--- Comment #7 from Ting-Wei Lan <lantw44 at gmail.com> ---
(In reply to Chris Wilson from comment #6)
> (In reply to Ting-Wei Lan from comment #5)
> > My gpu_devid is 0x0042, but
> > PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB is 0x0044 and
> > PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG is 0x0046.
> 
> diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
> index 3bb678e..7c68576 100644
> --- a/drivers/char/agp/intel-gtt.c
> +++ b/drivers/char/agp/intel-gtt.c
> @@ -581,7 +581,7 @@ static inline int needs_ilk_vtd_wa(void)
>         /* Query intel_iommu to see if we need the workaround. Presumably
> that
>          * was loaded first.
>          */
> -       if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB ||
> +       if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
>              gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
>              intel_iommu_gfx_mapped)
>                 return 1;

This patch fixes the problem on my machine.

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