Subject: Re: [Intel-gfx] linux-next: Tree for Jul 25 [ call-trace: drm | drm-intel related? ]

From: Chris Wilson <[email-masked]>
Date: Thu, 25 Jul 2013 18:26:16 +0100

On Thu, Jul 25, 2013 at 07:15:03PM +0200, Sedat Dilek wrote:
> On Thu, Jul 25, 2013 at 7:01 PM, Chris Wilson <[email-masked]> wrote:
> > Basically boils down to either an object allocation failure or mmaping
> > failure. I think dmesg with drm.debug=7 is the next step.
> 
> Attached! Thanks for taking care.

Hmm, looks like i915_gem_map_gtt fails, but no reason given, so can you
please apply this for more debug:

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0563661..34e09bf 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1630,24 +1630,29 @@ i915_gem_mmap_gtt(struct drm_file *file,
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
 	if (&obj->base == NULL) {
+		DRM_DRIVER_DEBUG("Unknown object handle %d\n", handle);
 		ret = -ENOENT;
 		goto unlock;
 	}
 
 	if (obj->base.size > dev_priv->gtt.mappable_end) {
+		DRM_DRIVER_DEBUG("Object (%d) larger than mappable aperture (%d) > %d\n",
+				(int)obj->base.size, (int)dev_priv->gtt.mappable_end);
 		ret = -E2BIG;
 		goto out;
 	}
 
 	if (obj->madv != I915_MADV_WILLNEED) {
-		DRM_ERROR("Attempting to mmap a purgeable buffer\n");
+		DRM_DRIVER_DEBUG("Attempting to mmap a purgeable buffer\n");
 		ret = -EINVAL;
 		goto out;
 	}
 
 	ret = i915_gem_object_create_mmap_offset(obj);
-	if (ret)
+	if (ret) {
+		DRM_DRIVER_DEBUG("Failed to allocate mmap offset (ret=%d)\n", ret);
 		goto out;
+	}
 
 	*offset = (u64)obj->base.map_list.hash.key << PAGE_SHIFT;

-- 
Chris Wilson, Intel Open Source Technology Centre