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drm/i915/execlists: Cache the last priolist lookup 

Avoid the repeated rbtree lookup for each request as we unwind them by
tracking the last priolist.

v2: Fix up my unhelpful suggestion of using default_priolist.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170928193910.17988-4-chris@chris-wilson.co.uk
hifive-unleashed-5.1
Michał Winiarski 2017-09-28 20:39:01 +01:00 committed by Chris Wilson
parent 7d1ea609f6
commit 097a94815f
1 changed files with 13 additions and 7 deletions
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20
drivers/gpu/drm/i915/intel_lrc.c
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@ -358,25 +358,31 @@ static void unwind_wa_tail(struct drm_i915_gem_request *rq)
static void unwind_incomplete_requests(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *rq, *rn;
struct i915_priolist *uninitialized_var(p);
int last_prio = I915_PRIORITY_INVALID;
lockdep_assert_held(&engine->timeline->lock);
list_for_each_entry_safe_reverse(rq, rn,
&engine->timeline->requests,
link) {
struct i915_priolist *p;
if (i915_gem_request_completed(rq))
return;
__i915_gem_request_unsubmit(rq);
unwind_wa_tail(rq);
p = lookup_priolist(engine,
&rq->priotree,
rq->priotree.priority);
list_add(&rq->priotree.link,
&ptr_mask_bits(p, 1)->requests);
GEM_BUG_ON(rq->priotree.priority == I915_PRIORITY_INVALID);
if (rq->priotree.priority != last_prio) {
p = lookup_priolist(engine,
&rq->priotree,
rq->priotree.priority);
p = ptr_mask_bits(p, 1);
last_prio = rq->priotree.priority;
}
list_add(&rq->priotree.link, &p->requests);
}
}