TIMESTAMP register

Lawrynowicz, Jacek
2012-04-17T19:12:45Z

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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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