If we are about to do another context-switch in the near future skip doing performing a lite-restore now. (Forcing a lite-restore just before a context-switch effectively doubles the cost of that context-switch, so long as we can handle the interrupt and resubmit before the GPU powers down, which under normal conditions is expected.)
Signed-off-by: Chris Wilson <[email protected]> Cc: Mika Kuoppala <[email protected]> Cc: Joonas Lahtinen <[email protected]> Cc: Tvrtko Ursulin <[email protected]> --- drivers/gpu/drm/i915/intel_lrc.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 6191a2e59e8a..2edd57b3d53e 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -628,6 +628,19 @@ static void execlists_dequeue(struct intel_engine_cs *engine) if (port_count(&port[1])) goto unlock; + /* + * If we are about to do another context-switch in + * the near future skip doing performing a lite-restore + * now. (Forcing a lite-restore just before a + * context-switch effectively doubles the cost of that + * context-switch, so long as we can handle the + * interrupt and resubmit before the GPU powers down, + * which under normal conditions is expected.) + */ + if (i915_seqno_passed(intel_engine_get_seqno(engine), + last->global_seqno - 1)) + goto unlock; + /* WaIdleLiteRestore:bdw,skl * Apply the wa NOOPs to prevent * ring:HEAD == req:TAIL as we resubmit the -- 2.15.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
