Hi!
Vladimir Dergachev wrote:
This has just been implemented in the Unichrome driver, and I'm not sure wether it's the best or most appopriate way to do it but it works as follows:Hi all,
Can someone more knowledgable explain to me how to properly access AGP space from within Mesa driver ?
What I want to do is to copy vertex data (i.e. coordinates, colors, etc) into an array in AGP space so that R300 engine can fetch it from there. Ideally, I would be able to tell Mesa to just store them there to begin with.
I looked at R200 MAOS code and I do not understand it - it looks like it does not use GART memory for vertex buffers, but instead users indirect buffers.
thank you
Vladimir Dergachev
1. The Mesa driver fills a "malloced" system memory buffer with vertex data.
2. The Mesa driver then calls the DRM through a via-specific IOCTL. (via_ioctl.c)
3. The via drm copies the buffer to another buffer in kernel system memory ( static storage ), (via_dma.c)
4. The via drm verifies the content of the buffer to reject buffers that contain commands that are considered harmful. (via_verifier.c)
5. The buffer is copied to AGP space, and the engine pointers are updated. (via_dma.c)
The reason for 3. is that running the verifier directly on AGP memory is very slow.
/Thomas
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