<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [BSW BDW] [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang after resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=96526#c60">Comment # 60</a> on <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [BSW BDW] [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang after resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=96526">bug 96526</a> from <a class="email" href="mailto:humberto.i.perez.rodriguez@intel.com" title="Humberto Israel Perez Rodriguez <humberto.i.perez.rodriguez@intel.com>"> Humberto Israel Perez Rodriguez</a> <pre>(In reply to Humberto Israel Perez Rodriguez from <a href="show_bug.cgi?id=96526#c59">comment #59</a>) > (In reply to Chris Wilson from <a href="show_bug.cgi?id=96526#c58">comment #58</a>) > > commit bafb2f7d4755bf1571bd5e9a03b97f3fc4fe69ae > > Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> > > Date: Wed Sep 21 14:51:08 2016 +0100 > > > > drm/i915/execlists: Reset RING registers upon resume > > > > There is a disparity in the context image saved to disk and our own > > bookkeeping - that is we presume the RING_HEAD and RING_TAIL match our > > stored ce->ring->tail value. However, as we emit WA_TAIL_DWORDS into the > > ring but may not tell the GPU about them, the GPU may be lagging behind > > our bookkeeping. Upon hibernation we do not save stolen pages, presuming > > that their contents are volatile. This means that although we start > > writing into the ring at tail, the GPU starts executing from its HEAD > > and there may be some garbage in between and so the GPU promptly hangs > > upon resume. > > > > Testcase: igt/gem_exec_suspend/basic-S4 > > Bugzilla: <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [BSW BDW] [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang after resume" href="show_bug.cgi?id=96526">https://bugs.freedesktop.org/show_bug.cgi?id=96526</a> > > Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> > > Reviewed-by: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>> > > Link: > > <a href="http://patchwork.freedesktop.org/patch/msgid/20160921135108.29574-3">http://patchwork.freedesktop.org/patch/msgid/20160921135108.29574-3</a>- > > <a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a> > > > with this commit and the following configuration on BXT this test pass : > > gem_exec_suspend basic-s4 > > Component : drm > tag : libdrm-2.4.70-15-gabfa680 > commit : abfa680 > > Component : cairo > tag : 1.15.2-58-gb207a93 > commit : b207a93 > > Component : intel-gpu-tools > tag : intel-gpu-tools-1.16-36-gd16318a > commit : d16318a > > > > Hardware information > ============================================ > Platform : BXT-P > Motherboard model : Broxton P > Motherboard type : NOTEBOOK Hand Held > Motherboard manufacturer : Intel Corp. > CPU family : Other > CPU information : 06/5c > GPU Card : Intel Corporation Device 5a84 (rev 0a) > (prog-if 00 [VGA controller]) > Memory ram : 16 GB > Maximum memory ram allowed : 16 GB > CPU thread : 4 > CPU core : 4 with the same gfx stack configuration and the same kernel this test pass as well in BDW platform : Hardware information ============================================ Platform : BDW Motherboard type : NUC5i5RYB Desktop CPU family : Core i5 CPU information : Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz GPU Card : Intel Corporation Broadwell-U Integrated Graphics (rev 09) (prog-if 00 [VGA controller]) Memory ram : 8 GB Maximum memory ram allowed : 16 GB CPU thread : 4 CPU core : 2 Socket : Socket BGA1168 Signature : Type 0, Family 6, Model 61, Stepping 4</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> </ul> </body> </html>