lkml.org 
[lkml]   [2014]   [Mar]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 3.13 06/46] drm/i915: Disable stolen memory when DMAR is active
    Date
    3.13-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Chris Wilson <chris@chris-wilson.co.uk>

    commit 0f4706d2740f2a221cd502922b22e522009041d9 upstream.

    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.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68535
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Signed-off-by: Jani Nikula <jani.nikula@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/i915/i915_gem_stolen.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
    +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
    @@ -201,6 +201,13 @@ int i915_gem_init_stolen(struct drm_devi
    struct drm_i915_private *dev_priv = dev->dev_private;
    int bios_reserved = 0;

    +#ifdef CONFIG_INTEL_IOMMU
    + if (intel_iommu_gfx_mapped) {
    + DRM_INFO("DMAR active, disabling use of stolen memory\n");
    + return 0;
    + }
    +#endif
    +
    if (dev_priv->gtt.stolen_size == 0)
    return 0;




    \
     
     \ /
      Last update: 2014-03-28 20:01    [W:4.296 / U:0.108 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site