On Fri, Aug 26, 2016 at 12:41:16PM +0300, Mika Kuoppala wrote:
> Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
>
> > Leave the more complicated request dequeueing to the tasklet and instead
> > just kick start the tasklet if we detect we are adding the first
> > request.
> >
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_lrc.c | 28 ++++------------------------
> > 1 file changed, 4 insertions(+), 24 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> > index 6b49df4316f4..ca52b8e63305 100644
> > --- a/drivers/gpu/drm/i915/intel_lrc.c
> > +++ b/drivers/gpu/drm/i915/intel_lrc.c
> > @@ -609,35 +609,15 @@ static void intel_lrc_irq_handler(unsigned long data)
> > static void execlists_submit_request(struct drm_i915_gem_request *request)
> > {
> > struct intel_engine_cs *engine = request->engine;
> > - struct drm_i915_gem_request *cursor;
> > - int num_elements = 0;
> >
> > spin_lock_bh(&engine->execlist_lock);
> >
> > - list_for_each_entry(cursor, &engine->execlist_queue, execlist_link)
> > - if (++num_elements > 2)
> > - break;
> > -
> > - if (num_elements > 2) {
> > - struct drm_i915_gem_request *tail_req;
> > -
> > - tail_req = list_last_entry(&engine->execlist_queue,
> > - struct drm_i915_gem_request,
> > - execlist_link);
> > -
> > - if (request->ctx == tail_req->ctx) {
> > - WARN(tail_req->elsp_submitted != 0,
> > - "More than 2 already-submitted reqs queued\n");
> > - list_del(&tail_req->execlist_link);
> > - i915_gem_request_put(tail_req);
> > - }
> > - }
> > -
> > i915_gem_request_get(request);
> > - list_add_tail(&request->execlist_link, &engine->execlist_queue);
> > request->ctx_hw_id = request->ctx->hw_id;
> > - if (num_elements == 0)
> > - execlists_unqueue(engine);
> > +
> > + list_add_tail(&request->execlist_link, &engine->execlist_queue);
> > + if (request->execlist_link.prev == &engine->execlist_queue)
>
> Why not list_first_entry()?
if (list_first_entry(&engine->execlist_queue) == request)
Could do. It was only a placeholder from patch splitting! :)
(I'm just more used to comparing prev/next from list iteration ;)
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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