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https://bugs.freedesktop.org/show_bug.cgi?id=6242
------- Additional Comments From [EMAIL PROTECTED] 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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