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@@ -720,8 +720,9 @@ void intel_crt_init(struct drm_device *dev)
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provides memory to back each object. When mapped into the GTT
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provides memory to back each object. When mapped into the GTT
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or used in a command buffer, the backing pages for an object are
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or used in a command buffer, the backing pages for an object are
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flushed to memory and marked write combined so as to be coherent
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flushed to memory and marked write combined so as to be coherent
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- with the GPU. Likewise, when the GPU finishes rendering to an object,
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- if the CPU accesses it, it must be made coherent with the CPU's view
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+ with the GPU. Likewise, if the CPU accesses an object after the GPU
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+ has finished rendering to the object, then the object must be made
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+ coherent with the CPU's view
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of memory, usually involving GPU cache flushing of various kinds.
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of memory, usually involving GPU cache flushing of various kinds.
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This core CPU<->GPU coherency management is provided by the GEM
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This core CPU<->GPU coherency management is provided by the GEM
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set domain function, which evaluates an object's current domain and
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set domain function, which evaluates an object's current domain and
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Michael Witten