Quoting Mika Kuoppala (2019-08-15 12:35:37) > Chris Wilson <ch...@chris-wilson.co.uk> writes: > > > Since __i915_request_queue() may be called from hardirq (timer) context, > > we cannot use local_bh_disable/enable at the lower level. As we do want > > to kick the tasklet to speed up initial submission or preemption for > > normal client submission, lift it to the normal process context > > callpath. > > > > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> > > --- > > drivers/gpu/drm/i915/i915_request.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/i915_request.c > > b/drivers/gpu/drm/i915/i915_request.c > > index 4021334dd2c5..8a2bc1d317e4 100644 > > --- a/drivers/gpu/drm/i915/i915_request.c > > +++ b/drivers/gpu/drm/i915/i915_request.c > > @@ -1203,12 +1203,10 @@ void __i915_request_queue(struct i915_request *rq, > > * decide whether to preempt the entire chain so that it is ready to > > * run at the earliest possible convenience. > > */ > > - local_bh_disable(); > > i915_sw_fence_commit(&rq->semaphore); > > if (attr && rq->engine->schedule) > > rq->engine->schedule(rq, attr); > > i915_sw_fence_commit(&rq->submit); > > - local_bh_enable(); /* Kick the execlists tasklet if just scheduled */ > > Was this here to only optimize the latency from schedule > to resubmission?
It's only for latency minimisation. If we don't do it now, the raise_softirq will not be until the process hits the scheduler. Fence -> backend is all irq-spinlocks. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
