KMS cursor BO semantics

[Thomas Hellstrom]

On 11/05/2011 05:10 PM, Daniel Vetter wrote:
> On Fri, Nov 04, 2011 at 11:30:06PM +0100, Thomas Hellstrom wrote:
>    
>> I'm not sure whether / how you handle the case of hardware render to
>> cursor surfaces on i915, but it seems to me like if a lot of drivers
>> need to implement driver specific "tricks" to meet the semantics of
>> a generic interface, we should perhaps consider specifying those
>> semantics in a way that helps avoid driver-specific workarounds?
>>      
> We don't handle really hanlde rendering to cursor objects. I think the
> "require a set_cursor after every cursor bo change" semantic is good, I've
> just feared that when only vmgfx needs this, no generic kms user will
> actually implement it. But nouveau seems to require this too, so I think
> at least for this case reality (and generic kms clients) will play along.
> -Daniel
>    

Great. I'll cook up a header file patch with some extra documentation.

/Thomas