[Bug 1950] New: AGP Ring-buffer support for the Unichrome driver.

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https://bugs.freedesktop.org/show_bug.cgi?id=1950        
   
           Summary: AGP Ring-buffer support for the Unichrome driver.
           Product: Mesa
           Version: CVS
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Drivers/DRI/Unichrome
        AssignedTo: dri...@li...
        ReportedBy: uni...@sh...


The Unichrome (via) DRM module implements an AGP ring buffer and the Unichrome
Mesa driver is currently not using it, but instead relies on its own programming
of the DMA engine. This is not good from a security point of view, since the
register space of the Unichrome chip must be exported read-write.

This patch makes the Unichrome driver use the AGP ring buffer in the DRM or fall
back to a PCI MMIO mechanism also in DRM if AGP is not enabled. 

Before this patch is commited, DRM must implement a more versatile command
buffer verifier. The current one does not let any 3D commands through, so it
must be disabled for this code to work. This code will help people debug such a
command verifier.

The patch also removes the VQ disabling from the driver. It uses direct video
register writes and it apparently is there for Tuxracer when the pci path is
used, but this seems to work fine on my test setup.

/Thomas        
   
   
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