Bug 27609

Summary: Regression: r600 CS checker rejects narrow FBO renderbuffers.
Product: DRI Reporter: Nick Bowler <nbowler>
Component: DRM/RadeonAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact:
Severity: major    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Full kernel log including failure message. none

Description Nick Bowler 2010-04-12 18:36:55 UTC 
Created attachment 34944 [details]
Full kernel log including failure message.

The R600 CS checker recently merged into the mainline kernel breaks rendering
to FBOs with renderbuffers of width <= 48.  The height does not matter.
Attempting to run such a program terminates with

  drmRadeonCmdBuffer: -22. Kernel failed to parse or rejected command stream.
  See dmesg for more info.

and in dmesg:
  radeon 0000:03:00.0: r600_cs_track_validate_cb:198 cb pitch (32 x 4 = 128) invalid
  radeon 0000:03:00.0: r600_packet3_check:1109 invalid cmd stream 514
  [drm:radeon_cs_ioctl] *ERROR* Invalid command stream !

Please see the test case attached to bug 27590 for a program which triggers
this issue.  The program works on Linux 2.6.33 and with the software
rasterizer.  The problem is reproducible with both mesa 7.8.1 and git master, against latest Linus git kernel.
Comment 1 Nick Bowler 2010-04-12 18:50:33 UTC 
I forgot to mention that the test program also (obviously) works if you adjust the renderbuffer width (-DXRES=##) to be at least 49.
Comment 2 Martin Peres 2019-11-19 08:12:24 UTC 
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