Quoting Ville Syrjala (2018-07-19 19:22:12) > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > The display engine stride limits are getting in our way. On SKL+ > we are limited to 8k pixels, which is easily exceeded with three > 4k displays. To overcome this limitation we can remap the pages > in the GTT to provide the display engine with a view of memory > with a smaller stride. > > The code is mostly already there as We already play tricks with > the plane surface address and x/y offsets. > > A few caveats apply: > * linear buffers need the fb stride to be page aligned, as > otherwise the remapped lines wouldn't start at the same > spot > * compressed buffers can't be remapped due to the new > ccs hash mode causing the virtual address of the pages > to affect the interpretation of the compressed data. IIRC > the old hash was limited to the low 12 bits so if we were > using that mode we could remap. As it stands we just refuse > to remapp with compressed fbs. > * no remapping gen2/3 as we'd need a fence for the remapped > vma, which we currently don't have But... you just forbade us getting a fence, there's nothing that actually would stop the fence register assignment from working? -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
