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

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Date:	Thu, 25 Jul 2013 22:52:59 +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 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)?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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