linux-kernel - Re: [Intel-gfx] linux-next: Tree for Jul 25 [ call-trace: drm

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Date:	Fri, 26 Jul 2013 00:25:56 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	DRI <dri-devel@...ts.freedesktop.org>,
	linux-next <linux-next@...r.kernel.org>
Subject: Re: [Intel-gfx] linux-next: Tree for Jul 25 [ call-trace: drm |
 drm-intel related? ]

On Fri, Jul 26, 2013 at 01:21:07AM +0200, Sedat Dilek wrote:
> On Thu, Jul 25, 2013 at 11:52 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> > On Thu, Jul 25, 2013 at 10:07:02PM +0200, Sedat Dilek wrote:
> >> What means the bang line?
> >>
> >> [    54.564] (II) GLX: Initialized DRI2 GL provider for screen 0
> >> [    54.565] bang: 1159
> >> [    54.565]
> >> Fatal server error:
> >> [    54.565] failed to create screen resources
> >
> > That means between the kernel reporting success for
> > DRM_IOCTL_I915_GEM_MMAP_GTT and libdrm returning from
> > drm_intel_gem_bo_map_gtt(), something went wrong. This implies that the
> > call to mmap() failed.
> >
> > I don't see how changing versions of the ddx would unmask the bug, nor
> > why the mmap() should suddenly start failing. Anybody have any
> > suggestions other than
> >
> > diff --git a/src/intel_uxa.c b/src/intel_uxa.c
> > index 2f14173..3872258 100644
> > --- a/src/intel_uxa.c
> > +++ b/src/intel_uxa.c
> > @@ -1149,12 +1149,15 @@ Bool intel_uxa_create_screen_resources(ScreenPtr screen)
> >         PixmapPtr pixmap;
> >         intel_screen_private *intel = intel_get_screen_private(scrn);
> >         dri_bo *bo = intel->front_buffer;
> > +       int ret;
> >
> >         if (!uxa_resources_init(screen))
> >                 return FALSE;
> >
> > -       if (drm_intel_gem_bo_map_gtt(bo))
> > +       if ((ret = drm_intel_gem_bo_map_gtt(bo))) {
> > +               ErrorF("%s:%d bang, errno=%d\n", __func__, __LINE__, -ret);
> >                 return FALSE;
> > +       }
> >
> >         pixmap = screen->GetScreenPixmap(screen);
> >         intel_set_pixmap_bo(pixmap, bo);
> >
> > which is most likely to report EINVAL (22)?
> 
> Yupp, this shows me...
> 
> [    28.542] (II) GLX: Initialized DRI2 GL provider for screen 0
> [    28.543] intel_uxa_create_screen_resources:1158 bang, errno=22
> [    28.543]
> Fatal server error:
> [    28.543] failed to create screen resources

I'm out of ideas, could you bisect this? Either kernel, userspace or
both. Thanks,
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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