[Intel-gfx] TIMESTAMP register

[Lawrynowicz, Jacek]

Hi,

 

Starting from IVB the main TIMESTAMP register is longer than 32 bits (it’s 36 bits long).

How should we pass its 36 bit value from i915 to user space?

GET_PARAM ioctls supports only 32 bit params. Should we add GET_PARAM64 or create separate ioctl to access the TIMESTAMP?

Any suggestions?

 

This functionality is required for any OpenGL driver which implements GL_ARB_timer_query.

 

Regards,

Jacek

 

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