drm/i915: Move calling engine->init_hw() to its own function

Just a simple refactor to move a loop and some support code out of
i915_gem_init_hw(). This is in preparation for avoiding a race between
the tasklet writing to ELSP whilst simultaneously being written by
engine->init_hw() following a GPU reset.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170208143033.11651-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ee62f66..8525196 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4367,11 +4367,24 @@ static void init_unused_rings(struct drm_i915_private *dev_priv)
        }
 }
 
-int
-i915_gem_init_hw(struct drm_i915_private *dev_priv)
+static int __i915_gem_restart_engines(void *data)
 {
+       struct drm_i915_private *i915 = data;
        struct intel_engine_cs *engine;
        enum intel_engine_id id;
+       int err;
+
+       for_each_engine(engine, i915, id) {
+               err = engine->init_hw(engine);
+               if (err)
+                       return err;
+       }
+
+       return 0;
+}
+
+int i915_gem_init_hw(struct drm_i915_private *dev_priv)
+{
        int ret;
 
        dev_priv->gt.last_init_time = ktime_get();
@@ -4417,11 +4430,9 @@ i915_gem_init_hw(struct drm_i915_private *dev_priv)
        }
 
        /* Need to do basic initialisation of all rings first: */
-       for_each_engine(engine, dev_priv, id) {
-               ret = engine->init_hw(engine);
-               if (ret)
-                       goto out;
-       }
+       ret = __i915_gem_restart_engines(dev_priv);
+       if (ret)
+               goto out;
 
        intel_mocs_init_l3cc_table(dev_priv);