<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [snb] GTT mapping fails after GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=63921#c9">Comment # 9</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [snb] GTT mapping fails after GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=63921">bug 63921</a> from <a class="email" href="mailto:nicolashillegeer@gmail.com" title="Nicolas Hillegeer <nicolashillegeer@gmail.com>"> Nicolas Hillegeer</a> <pre>(In reply to <a href="show_bug.cgi?id=63921#c8">comment #8</a>) > (In reply to <a href="show_bug.cgi?id=63921#c7">comment #7</a>) > > More interesting fail: > > > > [ 4366.361686] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... > > GPU hung > > [ 4366.361694] [drm] capturing error event; look for more information > > in/sys/kernel/debug/dri/0/i915_error_state > > [ 4366.871407] [drm:i915_reset] *ERROR* Failed to reset chip. > > [ 4376.364660] [drm:i915_gem_wait_for_error] *ERROR* Timed out waiting for > > the gpu reset to complete > > > > > > Pity we can't get the i915_error_state back, but if you can isolate the > > cause of the hang that will be enough for the libva (or whoever to work on). > > Please try this specifically for the reset hang: > > diff --git a/drivers/gpu/drm/i915/i915_gem.c > b/drivers/gpu/drm/i915/i915_gem.c > index 8539177..df9dfa5 100644 > --- a/drivers/gpu/drm/i915/i915_gem.c > +++ b/drivers/gpu/drm/i915/i915_gem.c > @@ -4036,6 +4036,10 @@ i915_gem_init_hw(struct drm_device *dev) > I915_WRITE(GEN7_MSG_CTL, temp); > } > > + DRM_ERROR("Forcing no wait on PCH (SNB ONLY)\n"); > + I915_WRITE(ILK_DISPLAY_CHICKEN2, > + I915_READ(ILK_DISPLAY_CHICKEN2) & ~(0x3 << 14)); > + > i915_gem_l3_remap(dev); > > i915_gem_init_swizzling(dev); (In reply to <a href="show_bug.cgi?id=63921#c8">comment #8</a>) > (In reply to <a href="show_bug.cgi?id=63921#c7">comment #7</a>) > > More interesting fail: > > > > [ 4366.361686] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... > > GPU hung > > [ 4366.361694] [drm] capturing error event; look for more information > > in/sys/kernel/debug/dri/0/i915_error_state > > [ 4366.871407] [drm:i915_reset] *ERROR* Failed to reset chip. > > [ 4376.364660] [drm:i915_gem_wait_for_error] *ERROR* Timed out waiting for > > the gpu reset to complete > > > > > > Pity we can't get the i915_error_state back, but if you can isolate the > > cause of the hang that will be enough for the libva (or whoever to work on). > > Please try this specifically for the reset hang: > > diff --git a/drivers/gpu/drm/i915/i915_gem.c > b/drivers/gpu/drm/i915/i915_gem.c > index 8539177..df9dfa5 100644 > --- a/drivers/gpu/drm/i915/i915_gem.c > +++ b/drivers/gpu/drm/i915/i915_gem.c > @@ -4036,6 +4036,10 @@ i915_gem_init_hw(struct drm_device *dev) > I915_WRITE(GEN7_MSG_CTL, temp); > } > > + DRM_ERROR("Forcing no wait on PCH (SNB ONLY)\n"); > + I915_WRITE(ILK_DISPLAY_CHICKEN2, > + I915_READ(ILK_DISPLAY_CHICKEN2) & ~(0x3 << 14)); > + > i915_gem_l3_remap(dev); > > i915_gem_init_swizzling(dev); @Chris: I'm not sure I'll deduce the cause of the hang by just repeating my testing (i.e.: playing a lot of movies, often multiple at a time), for SNA it seems to happen about every hour, with UXA it takes quite a bit longer. I'm trying UXA again and it's been going for 4 hours now. I hope I get some genious insight in the near future :). @Ben: I'll see what I can do! That's some crazy magic right there. I'll report tomorrow with the results. Is this codepath supposed to be called with UXA, SNA or both? Because I will start testing with SNA, since that seems to crash earlier and more predictably. Thanks! Nicolas</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>