From fb5970da1b428b6c0f89441b7d3015328da92cb6 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 7 Feb 2020 12:58:27 +0000 Subject: [PATCH] drm/i915/gt: Use the kernel_context to measure the breadcrumb size We set up a dummy ring in order to measure the size we require for our breadcrumb emission, so that we don't have to manually count dwords! We can pass in the kernel_context to use for this so that if required it is known for the breadcrumb emitter, and we can reuse some details from the kernel_context to reduce the number of temporaries we have to mock. Signed-off-by: Chris Wilson Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20200207125827.2787472-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 47 +++++++++-------------- 1 file changed, 19 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c index b1c7b1ed61496..f6f5e1ec48fca 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c @@ -631,13 +631,13 @@ static int engine_setup_common(struct intel_engine_cs *engine) struct measure_breadcrumb { struct i915_request rq; - struct intel_timeline timeline; struct intel_ring ring; u32 cs[1024]; }; -static int measure_breadcrumb_dw(struct intel_engine_cs *engine) +static int measure_breadcrumb_dw(struct intel_context *ce) { + struct intel_engine_cs *engine = ce->engine; struct measure_breadcrumb *frame; int dw = -ENOMEM; @@ -647,39 +647,27 @@ static int measure_breadcrumb_dw(struct intel_engine_cs *engine) if (!frame) return -ENOMEM; - if (intel_timeline_init(&frame->timeline, - engine->gt, - engine->status_page.vma)) - goto out_frame; - - mutex_lock(&frame->timeline.mutex); + frame->rq.i915 = engine->i915; + frame->rq.engine = engine; + frame->rq.context = ce; + rcu_assign_pointer(frame->rq.timeline, ce->timeline); frame->ring.vaddr = frame->cs; frame->ring.size = sizeof(frame->cs); frame->ring.effective_size = frame->ring.size; intel_ring_update_space(&frame->ring); - - frame->rq.i915 = engine->i915; - frame->rq.engine = engine; frame->rq.ring = &frame->ring; - rcu_assign_pointer(frame->rq.timeline, &frame->timeline); - - dw = intel_timeline_pin(&frame->timeline); - if (dw < 0) - goto out_timeline; + mutex_lock(&ce->timeline->mutex); spin_lock_irq(&engine->active.lock); + dw = engine->emit_fini_breadcrumb(&frame->rq, frame->cs) - frame->cs; + spin_unlock_irq(&engine->active.lock); + mutex_unlock(&ce->timeline->mutex); GEM_BUG_ON(dw & 1); /* RING_TAIL must be qword aligned */ - intel_timeline_unpin(&frame->timeline); - -out_timeline: - mutex_unlock(&frame->timeline.mutex); - intel_timeline_fini(&frame->timeline); -out_frame: kfree(frame); return dw; } @@ -754,12 +742,6 @@ static int engine_init_common(struct intel_engine_cs *engine) engine->set_default_submission(engine); - ret = measure_breadcrumb_dw(engine); - if (ret < 0) - return ret; - - engine->emit_fini_breadcrumb_dw = ret; - /* * We may need to do things with the shrinker which * require us to immediately switch back to the default @@ -772,9 +754,18 @@ static int engine_init_common(struct intel_engine_cs *engine) if (IS_ERR(ce)) return PTR_ERR(ce); + ret = measure_breadcrumb_dw(ce); + if (ret < 0) + goto err_context; + + engine->emit_fini_breadcrumb_dw = ret; engine->kernel_context = ce; return 0; + +err_context: + intel_context_put(ce); + return ret; } int intel_engines_init(struct intel_gt *gt) -- 2.39.5