Fw: add find_bo_from_cpu_mapping interface

[Christian König]

Well a bit background would probably help here.

This is useful because certain applications are hopelessly braindead and 
pass a CPU which they got from the driver in the first place and which 
is a pointer to a memory mapped BO back to the driver.

With this IOCTL the driver is capable to handle this case gracefully and 
use the original BO for example as replacement for an userptr.

Regards,
Christian.

On 03.12.2015 14:02, Zhou, David(ChunMing) wrote:
>
>
> UMD can find the bo by the cpu address of BO. Any comments?
>
>
> Regards,
>
> David Zhou
>
>
>
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