From 4ccfee92f4b6fbbedee1eb68f110a66f03edf7c6 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 22 Mar 2018 13:10:34 +0000 Subject: [PATCH] drm/i915: Remove local timeline var from submit/unsubmit Both request_submit and request_unsubmit deal with transferring the request from the client's timeline onto the execution timeline and back again. As both functions deal with a pair of timeline's, using a shorthand for just one of them is slightly confusing, especially as the different functions use the shorthand for the alternate timeline. Instead, use the full version of each timeline so it should be easier to keep track of the transfer between the request/client and the engine. v2: Refactor the common lock+list_move v3: Be clear we require the other timeline list to be locked as well. Signed-off-by: Chris Wilson Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20180322131034.6036-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_request.c | 30 ++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index f1b81fe4f9ab..2314a26cd7f8 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -492,10 +492,20 @@ static u32 timeline_get_seqno(struct intel_timeline *tl) return ++tl->seqno; } +static void move_to_timeline(struct i915_request *request, + struct intel_timeline *timeline) +{ + GEM_BUG_ON(request->timeline == request->engine->timeline); + lockdep_assert_held(&request->engine->timeline->lock); + + spin_lock(&request->timeline->lock); + list_move_tail(&request->link, &timeline->requests); + spin_unlock(&request->timeline->lock); +} + void __i915_request_submit(struct i915_request *request) { struct intel_engine_cs *engine = request->engine; - struct intel_timeline *timeline; u32 seqno; GEM_TRACE("%s fence %llx:%d -> global_seqno %d\n", @@ -506,12 +516,9 @@ void __i915_request_submit(struct i915_request *request) GEM_BUG_ON(!irqs_disabled()); lockdep_assert_held(&engine->timeline->lock); - /* Transfer from per-context onto the global per-engine timeline */ - timeline = engine->timeline; - GEM_BUG_ON(timeline == request->timeline); GEM_BUG_ON(request->global_seqno); - seqno = timeline_get_seqno(timeline); + seqno = timeline_get_seqno(engine->timeline); GEM_BUG_ON(!seqno); GEM_BUG_ON(i915_seqno_passed(intel_engine_get_seqno(engine), seqno)); @@ -525,9 +532,8 @@ void __i915_request_submit(struct i915_request *request) engine->emit_breadcrumb(request, request->ring->vaddr + request->postfix); - spin_lock(&request->timeline->lock); - list_move_tail(&request->link, &timeline->requests); - spin_unlock(&request->timeline->lock); + /* Transfer from per-context onto the global per-engine timeline */ + move_to_timeline(request, engine->timeline); trace_i915_request_execute(request); @@ -550,7 +556,6 @@ void i915_request_submit(struct i915_request *request) void __i915_request_unsubmit(struct i915_request *request) { struct intel_engine_cs *engine = request->engine; - struct intel_timeline *timeline; GEM_TRACE("%s fence %llx:%d <- global_seqno %d\n", request->engine->name, @@ -578,12 +583,7 @@ void __i915_request_unsubmit(struct i915_request *request) spin_unlock(&request->lock); /* Transfer back from the global per-engine timeline to per-context */ - timeline = request->timeline; - GEM_BUG_ON(timeline == engine->timeline); - - spin_lock(&timeline->lock); - list_move(&request->link, &timeline->requests); - spin_unlock(&timeline->lock); + move_to_timeline(request, request->timeline); /* * We don't need to wake_up any waiters on request->execute, they -- 2.39.5