As we reset the GPU on suspend/resume, we also do need to reset the
engine state tracking so call into the engine backends. This is
especially important so that we can also sanitize the state tracking
across resume.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a3885adec78a..fa09837d0569 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4911,11 +4911,15 @@ static void assert_kernel_context_is_current(struct 
drm_i915_private *i915)
 
 void i915_gem_sanitize(struct drm_i915_private *i915)
 {
-       if (i915_terminally_wedged(&i915->gpu_error)) {
-               mutex_lock(&i915->drm.struct_mutex);
+       struct intel_engine_cs *engine;
+       enum intel_engine_id id;
+       int err;
+
+       mutex_lock(&i915->drm.struct_mutex);
+       intel_uncore_forcewake_get(i915, FORCEWAKE_ALL);
+
+       if (i915_terminally_wedged(&i915->gpu_error))
                i915_gem_unset_wedged(i915);
-               mutex_unlock(&i915->drm.struct_mutex);
-       }
 
        /*
         * If we inherit context state from the BIOS or earlier occupants
@@ -4925,8 +4929,19 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
         * it may impact the display and we are uncertain about the stability
         * of the reset, so this could be applied to even earlier gen.
         */
-       if (INTEL_GEN(i915) >= 5 && intel_has_gpu_reset(i915))
-               WARN_ON(intel_gpu_reset(i915, ALL_ENGINES));
+       err = -ENODEV;
+       if (INTEL_GEN(i915) >= 5 && intel_has_gpu_reset(i915)) {
+               if (!WARN_ON(intel_gpu_reset(i915, ALL_ENGINES))) {
+                       for_each_engine(engine, i915, id) {
+                               if (engine->reset.reset)
+                                       engine->reset.reset(engine, NULL);
+                       }
+                       err = 0;
+               }
+       }
+
+       intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
+       mutex_unlock(&i915->drm.struct_mutex);
 }
 
 int i915_gem_suspend(struct drm_i915_private *dev_priv)
-- 
2.17.0

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