Quoting Ewelina Musial (2018-04-11 11:20:56) > On Wed, Apr 11, 2018 at 09:48:21AM +0100, Chris Wilson wrote: > > Quoting Ewelina Musial (2018-04-11 09:27:12) > > > Test have similar functionality that gem_cs_prefetch IGT test > > > but gem_cs_prefetch is not up to date and there was an idea > > > to move this test to kselftests so this is respond for this > > > request. > > > > gem_cs_prefetch itself does one thing: verify that we cannot cross the > > page boundary beyond the last page of the GTT. It is about the Command > > Streamer prefetch; there is no command streamer here. > > > > gem_cs_prefetch could be simplified by EXEC_OBJECT_PINNED, I think the > > notes got muddled up. > > -Chris > > Probably you are right. I focused on some other point of view. My test is > checking > that if we cross the boundary beyond the last page values are stored in > scratch.
If we cross the boundary beyond the end of the last page of the GTT, there are no more pages. Hitting scratch is not a sensible test; scratch is just a figment of the imagination, the only reason it may exist in some circumstances is to prevent page faults. And other than vtd w/a that was a bad idea. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
