On Fri, Jul 18, 2014 at 1:16 AM, Ben Widawsky <b...@bwidawsk.net> wrote:
> On Fri, Jul 11, 2014 at 10:20:08AM -0700, armin.c.re...@intel.com wrote:
>> From: Armin Reese <armin.c.re...@intel.com>
>>
>> Signed-off-by: Armin Reese <armin.c.re...@intel.com>
>> ---
>> drivers/gpu/drm/i915/i915_gem_gtt.c | 13 ++++++-------
>> 1 file changed, 6 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
>> b/drivers/gpu/drm/i915/i915_gem_gtt.c
>> index afd4eef..7e2190e 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
>> @@ -1624,18 +1624,17 @@ static void ggtt_unbind_vma(struct i915_vma *vma)
>>
>> void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj)
>> {
>> - struct drm_device *dev = obj->base.dev;
>> - struct drm_i915_private *dev_priv = dev->dev_private;
>> - bool interruptible;
>> -
>> - interruptible = do_idling(dev_priv);
>> + if (!obj->has_dma_mapping) {
>> + struct drm_device *dev = obj->base.dev;
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> + bool interruptible = do_idling(dev_priv);
>>
>> - if (!obj->has_dma_mapping)
>> dma_unmap_sg(&dev->pdev->dev,
>> obj->pages->sgl, obj->pages->nents,
>> PCI_DMA_BIDIRECTIONAL);
>>
>> - undo_idling(dev_priv, interruptible);
>> + undo_idling(dev_priv, interruptible);
>> + }
>> }
>>
>> static void i915_gtt_color_adjust(struct drm_mm_node *node,
>
> Note that this doesn't do much on platforms you care about.
To elaborate: This w/a is _only_ used on ironlake when the iommu is
enabled. Also the performance impact of it is so disastrous that any
kind of optimization is pointless.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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