On Tue, Jul 12, 2016 at 11:50:26AM +0300, Joonas Lahtinen wrote: > On pe, 2016-06-24 at 14:07 +0100, Chris Wilson wrote: > > One of the numerous VT-d workarounds we require is that the display > > hardware reads past the end of the buffer triggering VT-d faults. This > > is acknowledged in the code as being safe "since we fill the unused > > portions of the GGTT with the scratch page". Alas, that is no longer > > always true and so we trigger DMAR read faults. > > > > Skylake also requires another workaround to avoid mixing VT-d and > > unpopulated PTE, and so there we also need to ensure we fill unused > > entries with the scratch page. > > Rather agressive W/A for just scanout, so maybe drop the scanout word?
The original w/a was just for VT'd + scanout, I was thinking of a comment, but it never materialised. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
