<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [regression] [i915] DMAR Errors Spamming Logs" href="https://bugs.freedesktop.org/show_bug.cgi?id=96584#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [regression] [i915] DMAR Errors Spamming Logs" href="https://bugs.freedesktop.org/show_bug.cgi?id=96584">bug 96584</a> from <a class="email" href="mailto:mike@fireburn.co.uk" title="Mike Lothian <mike@fireburn.co.uk>"> Mike Lothian</a> <pre>Sorry I made a mistake in the last part of the bisect The first broken commit is: commit f7770bfd9fd2ef13a5b70de1ffbc16019a929b48 Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Sat May 14 07:26:35 2016 +0100 drm/i915: Skip clearing the GGTT on full-ppgtt systems Under full-ppgtt, access to the global GTT is carefully regulated through hardware functions (i.e. userspace cannot read and write to arbitrary locations in the GGTT via the GPU). With this restriction in place, we can forgo clearing stale entries from the GGTT as they will not be accessed. For aliasing-ppgtt, we could almost do the same except that we do allow userspace access to the global-GTT via execbuf in order to workraound some quirks of certain instructions. (This execbuf path is filtered out with EINVAL on full-ppgtt.) The most dramatic effect this will have will be during resume, as with full-ppgtt the GGTT is only used sparingly. References: <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL/KBL] Init time is high" href="show_bug.cgi?id=94722">https://bugs.freedesktop.org/show_bug.cgi?id=94722</a> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Cc: David Weinehall <<a href="mailto:david.weinehall@intel.com">david.weinehall@intel.com</a>> Reviewed-by: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>> Tested-by: David Weinehall <<a href="mailto:david.weinehall@intel.com">david.weinehall@intel.com</a>> Link: <a href="http://patchwork.freedesktop.org/patch/msgid/1463207195-22076-4-git-send-email-chris@chris-wilson.co.uk">http://patchwork.freedesktop.org/patch/msgid/1463207195-22076-4-git-send-email-chris@chris-wilson.co.uk</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>