Quoting Matthew Auld (2017-09-22 18:32:44) > Before we can fully enable 64K pages, we need to first support a 64K > scratch page if we intend to support the case where we have object sizes > < 2M, since any scratch PTE must also point to a 64K region. Without > this our 64K usage is limited to objects which completely fill the > page-table, and therefore don't need any scratch. > > v2: add reminder about why 48b PPGTT > > Reported-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> We really, really should write protect the scratch page so that we can share it between ppgtt. We can't make it simply unreadable as we use it for padding. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
