Bug 15832

Summary:	ABI change in current DRM module for i945GM
Product:	Mesa	Reporter:	Bernhard Rosenkraenzer <bero>
Component:	Drivers/DRI/i915	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED WONTFIX	QA Contact:
Severity:	enhancement
Priority:	medium	CC:	haihao.xiang
Version:	git
Hardware:	All
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Bernhard Rosenkraenzer 2008-05-05 05:28:12 UTC

After an update from kernel 2.6.25 with DRM modules from a 2008/04/18 git checkout to kernel 2.6.25.1 with DRM modules from today's git, applications using DRI fail on startup, saying

DRM_I915_EXECBUFFER: -22

Userland is today's git xserver and mesa and xf86-video-intel-2.3.0. The same userland works well when booting into the old kernel.

With the new kernel:
$ LIBGL_DEBUG=verbose etracer
[...]
libGL: XF86DRIGetClientDriverName: 1.9.0 i915 (screen 0)
libGL: OpenDriver: trying /usr/lib/dri/tls/i915_dri.so
libGL: OpenDriver: trying /usr/lib/dri/i915_dri.so
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 8, (OK)
drmOpenByBusid: Searching for BusID pci:0000:00:02.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 8, (OK)
drmOpenByBusid: drmOpenMinor returns 8
drmOpenByBusid: drmGetBusid reports pci:0000:00:02.0
libGL error: Can't open configuration file /etc/drirc: No such file or directory.
libGL error: Can't open configuration file /home/arklinux/.drirc: No such file or directory.

DRM_I915_EXECBUFFER: -22


$ dmesg
[drm] Initialized i915 1.13.0 20080312 on minor 0
[drm] Used old pci detect: framebuffer loaded:
[drm:drm_lookup_buffer_object] *ERROR* Could not find buffer object 0x00000010
[drm:i915_validate_buffer_list] *ERROR* error on handle validate -22


There is nothing unusual in Xorg.0.log.


Chipset is a 945GM (PCI ID 8086:27a2, subsystem 17c0:4070)

Comment 1 Bernhard Rosenkraenzer 2008-05-05 12:32:37 UTC

git bisect results:

feff72929e94b6c17e352a2ec86b3440b9edf059 is first bad commit
commit feff72929e94b6c17e352a2ec86b3440b9edf059
Author: Xiang, Haihao <haihao.xiang@intel.com>
Date:   Wed Apr 23 17:16:53 2008 +0800

    i915: fix for compatibility mode

:040000 040000 e4b25270c016215377ce0438ff955945fff949c9 05bd5c5213e98211335f74b8007d0ced6db0381f M      shared-core

Comment 2 Bernhard Rosenkraenzer 2008-05-05 12:35:40 UTC

That commit looks harmless, probably it's just a matter of having to recompile the driver after making sure the current i915_drm.h is in the system...

Comment 3 Bernhard Rosenkraenzer 2008-05-05 13:44:25 UTC

Yes, it's an undetected ABI change.
Installing libdrm from git and then rebuilding mesa against it fixes the problem.

It would still be nice if the driver detected it and gave a more useful error message.

Comment 4 Gordon Jin 2008-12-04 19:56:07 UTC

I'm closing since no one showed interest in the follow-up, and it's trivial.

Comment 5 Adam Jackson 2009-08-24 12:30:11 UTC

Mass version move, cvs -> git

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