On Tue, Apr 17, 2012 at 07:12:40PM +0000, Lawrynowicz, Jacek wrote: > 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. Like occlusion queries I presume this should be done with a pipe control qword write issued from a batch. GETPARAM makes absolutely no sense, that is for driver features, not hw features and just used so that a new driver also can work on an older kernel. -Daniel -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
