From f131e3562ef0e0aa418eeb60a8fd562c5b9b0122 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 29 Dec 2016 14:40:37 +0000 Subject: [PATCH] drm/i915: Skip switch to kernel context if already done Some engines are never user or already sitting idle in the kernel context and for those we can skip flushing the current context for i915_gem_switch_to_kernel_context(). We used to perform this optimisation but that was removed for convenience of converting over to multiple timelines and handling the pending request queues. From the perspective of writing selftests, reducing the number of background operations on the engines makes defining assertions easier. Signed-off-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/20170114162334.10271-2-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem.c | 3 ++- drivers/gpu/drm/i915/i915_gem_context.c | 25 +++++++++++++++++++++++++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index d4c59b53532e..83cd2eff37af 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4140,7 +4140,8 @@ static void assert_kernel_context_is_current(struct drm_i915_private *dev_priv) enum intel_engine_id id; for_each_engine(engine, dev_priv, id) - GEM_BUG_ON(!i915_gem_context_is_kernel(engine->last_retired_context)); + GEM_BUG_ON(engine->last_retired_context && + !i915_gem_context_is_kernel(engine->last_retired_context)); } int i915_gem_suspend(struct drm_i915_private *dev_priv) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index ae99c25397ca..0a4728fdecdc 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -877,6 +877,26 @@ int i915_switch_context(struct drm_i915_gem_request *req) return do_rcs_switch(req); } +static bool engine_has_kernel_context(struct intel_engine_cs *engine) +{ + struct i915_gem_timeline *timeline; + + list_for_each_entry(timeline, &engine->i915->gt.timelines, link) { + struct intel_timeline *tl; + + if (timeline == &engine->i915->gt.global_timeline) + continue; + + tl = &timeline->engine[engine->id]; + if (i915_gem_active_peek(&tl->last_request, + &engine->i915->drm.struct_mutex)) + return false; + } + + return (!engine->last_retired_context || + i915_gem_context_is_kernel(engine->last_retired_context)); +} + int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv) { struct intel_engine_cs *engine; @@ -885,10 +905,15 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv) lockdep_assert_held(&dev_priv->drm.struct_mutex); + i915_gem_retire_requests(dev_priv); + for_each_engine(engine, dev_priv, id) { struct drm_i915_gem_request *req; int ret; + if (engine_has_kernel_context(engine)) + continue; + req = i915_gem_request_alloc(engine, dev_priv->kernel_context); if (IS_ERR(req)) return PTR_ERR(req); -- 2.20.1