Re: CUDA port for intel graphics

[Chris Wilson <chris@chris-wilson.co.uk>]

Hi Gregory,

I think most of your questions can be answered by reading the [interface]
design document for GEM - the Graphics Execution Manager.

http://lwn.net/Articles/283798/

That will give you a better idea of the separation of the execution and
memory management which is performed by the kernel and how it is
controlled by userspace. All userspace clients are [more or less] equal
and submit batch buffers to the kernel to be scheduled for execution. Each
batch is a list of buffers [your textures, command streams, vertex buffers
etc] which the kernel then maps into the graphics aperture and performs
relocations upon the command streams. As such the GPU is then shared
between multiple independent clients. If you want to perform a privileged
operation such as modifying the ring buffer or registers prior to the
execution of your batch, you will need to extend the GEM interface to
allow you to do so.

Hope this helps, and you have a lot of fun programming with the GPU
directly.
-- 
Chris Wilson, Intel Open Source Technology Centre