drm/i915: Lift intel_engines_resume() to callers

Since the reset path wants to recover the engines itself, it only wants
to reinitialise the hardware using i915_gem_init_hw(). Pull the call to
intel_engines_resume() to the module init/resume path so we can avoid it
during reset.

Fixes: 79ffac8599c4 ("drm/i915: Invert the GEM wakeref hierarchy")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190626154549.10066-3-chris@chris-wilson.co.uk
(cherry picked from commit 092be382a2602067766f190a113514d469162456)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

5 files changed, 41 insertions, 29 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
index 2ce00d3dc42a..ae5b6baf6dff 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
@@ -142,27 +142,3 @@ void intel_engine_init__pm(struct intel_engine_cs *engine)
 {
 	intel_wakeref_init(&engine->wakeref);
 }
-
-int intel_engines_resume(struct drm_i915_private *i915)
-{
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-	int err = 0;
-
-	intel_gt_pm_get(i915);
-	for_each_engine(engine, i915, id) {
-		intel_engine_pm_get(engine);
-		engine->serial++; /* kernel context lost */
-		err = engine->resume(engine);
-		intel_engine_pm_put(engine);
-		if (err) {
-			dev_err(i915->drm.dev,
-				"Failed to restart %s (%d)\n",
-				engine->name, err);
-			break;
-		}
-	}
-	intel_gt_pm_put(i915);
-
-	return err;
-}
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.h b/drivers/gpu/drm/i915/gt/intel_engine_pm.h
index b326cd993d60..f6f213fbc98c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.h
@@ -17,6 +17,4 @@ void intel_engine_park(struct intel_engine_cs *engine);
 
 void intel_engine_init__pm(struct intel_engine_cs *engine);
 
-int intel_engines_resume(struct drm_i915_private *i915);
-
 #endif /* INTEL_ENGINE_PM_H */
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index 7b5967751762..9f8f7f54191f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -5,6 +5,7 @@
  */
 
 #include "i915_drv.h"
+#include "intel_engine_pm.h"
 #include "intel_gt_pm.h"
 #include "intel_pm.h"
 #include "intel_wakeref.h"
@@ -118,10 +119,11 @@ void intel_gt_sanitize(struct drm_i915_private *i915, bool force)
 		intel_engine_reset(engine, false);
 }
 
-void intel_gt_resume(struct drm_i915_private *i915)
+int intel_gt_resume(struct drm_i915_private *i915)
 {
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
+	int err = 0;
 
 	/*
 	 * After resume, we may need to poke into the pinned kernel
@@ -129,9 +131,12 @@ void intel_gt_resume(struct drm_i915_private *i915)
 	 * Only the kernel contexts should remain pinned over suspend,
 	 * allowing us to fixup the user contexts on their first pin.
 	 */
+	intel_gt_pm_get(i915);
 	for_each_engine(engine, i915, id) {
 		struct intel_context *ce;
 
+		intel_engine_pm_get(engine);
+
 		ce = engine->kernel_context;
 		if (ce)
 			ce->ops->reset(ce);
@@ -139,5 +144,19 @@ void intel_gt_resume(struct drm_i915_private *i915)
 		ce = engine->preempt_context;
 		if (ce)
 			ce->ops->reset(ce);
+
+		engine->serial++; /* kernel context lost */
+		err = engine->resume(engine);
+
+		intel_engine_pm_put(engine);
+		if (err) {
+			dev_err(i915->drm.dev,
+				"Failed to restart %s (%d)\n",
+				engine->name, err);
+			break;
+		}
 	}
+	intel_gt_pm_put(i915);
+
+	return err;
 }
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
index 7dd1130a19a4..53f342b20181 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
@@ -22,6 +22,6 @@ void intel_gt_pm_put(struct drm_i915_private *i915);
 void intel_gt_pm_init(struct drm_i915_private *i915);
 
 void intel_gt_sanitize(struct drm_i915_private *i915, bool force);
-void intel_gt_resume(struct drm_i915_private *i915);
+int intel_gt_resume(struct drm_i915_private *i915);
 
 #endif /* INTEL_GT_PM_H */
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 4c478b38e420..0439ed66e969 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -951,6 +951,21 @@ static int do_reset(struct drm_i915_private *i915,
 	return gt_reset(i915, stalled_mask);
 }
 
+static int resume(struct drm_i915_private *i915)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int ret;
+
+	for_each_engine(engine, i915, id) {
+		ret = engine->resume(engine);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 /**
  * i915_reset - reset chip after a hang
  * @i915: #drm_i915_private to reset
@@ -1024,9 +1039,13 @@ void i915_reset(struct drm_i915_private *i915,
 	if (ret) {
 		DRM_ERROR("Failed to initialise HW following reset (%d)\n",
 			  ret);
-		goto error;
+		goto taint;
 	}
 
+	ret = resume(i915);
+	if (ret)
+		goto taint;
+
 	i915_queue_hangcheck(i915);
 
 finish: