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drm/i915/gtt: Unmap the PCI pages after unbinding them from the GTT

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Dave Airlie spotted that his ILK laptop with DMAR enabled was generating
the occasional DMAR warning.

"The ordering in the previous code was to rewrite the GTT table before
unmapping the pages and that makes sense to me."

This is his stable patch ported to d-i-n.

Reported-by: Dave Airlie <airlied@redhat.com>
Original-patch-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-01-11 11:07:54 +00:00
parent bcfb2e2858
commit d912640058
1 changed files with 5 additions and 9 deletions
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14
drivers/gpu/drm/i915/i915_gem_gtt.c
View file

@ -85,15 +85,11 @@ int i915_gem_gtt_bind_object(struct drm_i915_gem_object *obj)
void i915_gem_gtt_unbind_object(struct drm_i915_gem_object *obj)
{
struct drm_device *dev = obj->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->mm.gtt->needs_dmar) {
intel_gtt_unmap_memory(obj->sg_list, obj->num_sg);
obj->sg_list = NULL;
obj->num_sg = 0;
}
intel_gtt_clear_range(obj->gtt_space->start >> PAGE_SHIFT,
obj->base.size >> PAGE_SHIFT);
if (obj->sg_list) {
intel_gtt_unmap_memory(obj->sg_list, obj->num_sg);
obj->sg_list = NULL;
}
}