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Add GT stats to measure the time spent switching between pagefault mode and dma-fence mode. Also add a GT stat to indicate when pagefault suspend is skipped because the system is idle. These metrics will help profile pagefault workloads while 3D and display are enabled. v2: - Use GT stats helper functions (Francois) Signed-off-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Francois Dugast <francois.dugast@intel.com> Link: https://patch.msgid.link/20251212182847.1683222-8-matthew.brost@intel.com