[Intel-gfx] TIMESTAMP register

Lawrynowicz, Jacek jacek.lawrynowicz at intel.com
Tue Apr 17 21:12:40 CEST 2012



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.





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