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drm/i915: Kill GTT mappings when moving from GTT domain 

In order to force a page-fault on a GTT mapping after we start using it
from the GPU and so enforce correct CPU/GPU synchronisation, we need to
invalidate the mapping.

Pointed out by Owain G. Ainsworth.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-10-28 14:44:08 +01:00
parent e5281ccd2e
commit 4a684a4117
1 changed files with 10 additions and 4 deletions
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14
drivers/gpu/drm/i915/i915_gem.c
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@ -1314,12 +1314,12 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
ret = i915_gem_object_bind_to_gtt(obj, 0, true);
if (ret)
goto unlock;
ret = i915_gem_object_set_to_gtt_domain(obj, write);
if (ret)
goto unlock;
}
ret = i915_gem_object_set_to_gtt_domain(obj, write);
if (ret)
goto unlock;
if (!obj_priv->fault_mappable) {
obj_priv->fault_mappable = true;
i915_gem_info_update_mappable(dev_priv, obj, true);
@ -2859,6 +2859,8 @@ i915_gem_object_flush_gtt_write_domain(struct drm_gem_object *obj)
* to it immediately go to main memory as far as we know, so there's
* no chipset flush. It also doesn't land in render cache.
*/
i915_gem_release_mmap(obj);
old_write_domain = obj->write_domain;
obj->write_domain = 0;
@ -3183,6 +3185,10 @@ i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj,
if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_CPU)
i915_gem_clflush_object(obj);
/* blow away mappings if mapped through GTT */
if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_GTT)
i915_gem_release_mmap(obj);
/* The actual obj->write_domain will be updated with
* pending_write_domain after we emit the accumulated flush for all
* of our domain changes in execbuffers (which clears objects'