[Libva] I want to use VA-API to support new platform, I want know something about Intel implementation

[Randy Li]

Hi all
   I am using VA-API to support the Video Process Unit in a ARM 
platform, but it didn't use the standard kernel interface. Without the 
help of DRI, I can't implement something like vaDeriveImage() leading
a lose in performance.
   I read the Intel driver, it looks the Intel driver could access the 
the Memory of Video Unit of Intel Graphics card through the libdrm.
If that is right, could somebody told me how does it implemented in
linux kernel(which files?).
   And I am really newbies to this area(DRI), could somebody give me
guide and documents about this?
   Thank you all very much.
-- 
Randy Li
The third produce department