From c10c78ade57afe36fe290f79e466fcd5304e2f20 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 8 Feb 2019 23:51:08 +0000 Subject: [PATCH] drm/i915/execlists: Refactor out can_merge_rq() In the next patch, we add another user that wants to check whether requests can be merge into a single HW execution, and in the future we want to add more conditions under which requests from the same context cannot be merge. In preparation, extract out can_merge_rq(). v2: Reorder tests to decide if we can continue filling ELSP and bonus comments. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20190208235108.23127-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_lrc.c | 35 ++++++++++++++++++++++---------- 1 file changed, 24 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 1b567a3f006a..a62791a30c7e 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -254,12 +254,11 @@ static inline bool need_preempt(const struct intel_engine_cs *engine, } __maybe_unused static inline bool -assert_priority_queue(const struct intel_engine_execlists *execlists, - const struct i915_request *prev, +assert_priority_queue(const struct i915_request *prev, const struct i915_request *next) { - if (!prev) - return true; + const struct intel_engine_execlists *execlists = + &prev->engine->execlists; /* * Without preemption, the prev may refer to the still active element @@ -564,6 +563,17 @@ static bool can_merge_ctx(const struct intel_context *prev, return true; } +static bool can_merge_rq(const struct i915_request *prev, + const struct i915_request *next) +{ + GEM_BUG_ON(!assert_priority_queue(prev, next)); + + if (!can_merge_ctx(prev->hw_context, next->hw_context)) + return false; + + return true; +} + static void port_assign(struct execlist_port *port, struct i915_request *rq) { GEM_BUG_ON(rq == port_request(port)); @@ -716,8 +726,6 @@ static void execlists_dequeue(struct intel_engine_cs *engine) int i; priolist_for_each_request_consume(rq, rn, p, i) { - GEM_BUG_ON(!assert_priority_queue(execlists, last, rq)); - /* * Can we combine this request with the current port? * It has to be the same context/ringbuffer and not @@ -729,8 +737,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine) * second request, and so we never need to tell the * hardware about the first. */ - if (last && - !can_merge_ctx(rq->hw_context, last->hw_context)) { + if (last && !can_merge_rq(last, rq)) { /* * If we are on the second port and cannot * combine this request with the last, then we @@ -739,6 +746,14 @@ static void execlists_dequeue(struct intel_engine_cs *engine) if (port == last_port) goto done; + /* + * We must not populate both ELSP[] with the + * same LRCA, i.e. we must submit 2 different + * contexts if we submit 2 ELSP. + */ + if (last->hw_context == rq->hw_context) + goto done; + /* * If GVT overrides us we only ever submit * port[0], leaving port[1] empty. Note that we @@ -750,7 +765,6 @@ static void execlists_dequeue(struct intel_engine_cs *engine) ctx_single_port_submission(rq->hw_context)) goto done; - GEM_BUG_ON(last->hw_context == rq->hw_context); if (submit) port_assign(port, last); @@ -790,8 +804,7 @@ done: * request triggering preemption on the next dequeue (or subsequent * interrupt for secondary ports). */ - execlists->queue_priority_hint = - port != execlists->port ? rq_prio(last) : INT_MIN; + execlists->queue_priority_hint = queue_prio(execlists); if (submit) { port_assign(port, last); -- 2.30.2