[Bug 27609] New: Regression: r600 CS checker rejects narrow FBO renderbuffers.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27609

           Summary: Regression: r600 CS checker rejects narrow FBO
                    renderbuffers.
           Product: DRI
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: nbowler at draconx.ca


Created an attachment (id=34944)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=34944)
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.

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