[Bug 6242] [agp mach64] Use DMA buffers for mach64_dma_vertex

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------- Additional Comments From fuf...@ho...  2006-04-10 11:34 -------
(In reply to comment #9)
> What about the following approach:
> 
> Do not map the DMA buffers to user-space.
>
> [...] 
>
> Hopefully, we can reuse the current buffer management routines. If it is
> possible to do drmAddBufs without drmMapBufs, then very little changes are
> required (I saw a comment in drm_mapbufs that PCI buffers are actually mapped
> in drm_addbufs ...).
> 
I'am trying to tackle this by mapping the DMA buffers READ_ONLY. My current
understanding is that PCI DMA buffers do actually get mapped in drm_mapbufs:
drm_mapbufs -> do_mmap(..., 0) -> drm_mmap -> drm_mmap_dma

If this is correct, can someone piggyback the following change at the
description of drm_mapbufs?

 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
 * offset equal to 0, which drm_mmap interpretes as PCI buffers and calls
 * drm_mmap_dma().



          
     
     
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