[Intel-gfx] [PATCH 09/30] drm/i915: Move idle barrier cleanup into engine-pm

[Chris Wilson]

Now that we now longer need to guarantee that the active callback is
under the struct_mutex, we can lift it out of the i915_gem_park() and
into the engine parking itself.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_pm.c    | 19 -------------------
 drivers/gpu/drm/i915/gt/intel_engine_pm.c | 15 +++++++++++++++
 drivers/gpu/drm/i915/i915_active.c        |  1 +
 3 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c 
b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
index 0a4115c6c275..5180b2ee1cb7 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
@@ -11,29 +11,10 @@
 #include "i915_drv.h"
 #include "i915_globals.h"
 
-static void call_idle_barriers(struct intel_engine_cs *engine)
-{
-       struct llist_node *node, *next;
-
-       llist_for_each_safe(node, next, llist_del_all(&engine->barrier_tasks)) {
-               struct dma_fence_cb *cb =
-                       container_of((struct list_head *)node,
-                                    typeof(*cb), node);
-
-               cb->func(NULL, cb);
-       }
-}
-
 static void i915_gem_park(struct drm_i915_private *i915)
 {
-       struct intel_engine_cs *engine;
-       enum intel_engine_id id;
-
        lockdep_assert_held(&i915->drm.struct_mutex);
 
-       for_each_engine(engine, i915, id)
-               call_idle_barriers(engine); /* cleanup after wedging */
-
        i915_vma_parked(i915);
 
        i915_globals_park();
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c 
b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
index 66fc49b76ea8..8e5e513eddc9 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
@@ -124,6 +124,19 @@ static bool switch_to_kernel_context(struct 
intel_engine_cs *engine)
        return result;
 }
 
+static void call_idle_barriers(struct intel_engine_cs *engine)
+{
+       struct llist_node *node, *next;
+
+       llist_for_each_safe(node, next, llist_del_all(&engine->barrier_tasks)) {
+               struct dma_fence_cb *cb =
+                       container_of((struct list_head *)node,
+                                    typeof(*cb), node);
+
+               cb->func(NULL, cb);
+       }
+}
+
 static int __engine_park(struct intel_wakeref *wf)
 {
        struct intel_engine_cs *engine =
@@ -143,6 +156,8 @@ static int __engine_park(struct intel_wakeref *wf)
 
        GEM_TRACE("%s\n", engine->name);
 
+       call_idle_barriers(engine); /* cleanup after wedging */
+
        intel_engine_disarm_breadcrumbs(engine);
        intel_engine_pool_park(&engine->pool);
 
diff --git a/drivers/gpu/drm/i915/i915_active.c 
b/drivers/gpu/drm/i915/i915_active.c
index 023652ded4be..aa37c07004b9 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -693,6 +693,7 @@ void i915_active_acquire_barrier(struct i915_active *ref)
                rb_link_node(&node->node, parent, p);
                rb_insert_color(&node->node, &ref->tree);
 
+               GEM_BUG_ON(!intel_engine_pm_is_awake(engine));
                llist_add(barrier_to_ll(node), &engine->barrier_tasks);
                intel_engine_pm_put(engine);
        }
-- 
2.23.0

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