On Wed, 2011-11-23 at 16:41 +0100, Daniel Vetter wrote: > Hm, that comment confuses me a bit. I've always thought that igfx_off only > instantiates a identity mapping and leaves the dmar unit on. Is that > wrong?
It's completely off. If a DMAR unit has *only* graphics devices behind it (as the one for the built-in graphics does, because it's a whole boatload of speshul case for integration with the GTT), we just don't enable it at all. See the second for_each_drhd_unit() loop in init_no_remapping_devices(). -- dwmw2
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