drm/i915: Only save and restore fences for UMS

With KMS, we can simply relinquish the fence when we idle the GPU and
reassign it upon first use.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1e9cf2bf9ba4..939c9e34ce96 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1905,11 +1905,22 @@ static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
         }
 }
 
+static void i915_gem_reset_fences(struct drm_device *dev)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        int i;
+
+        for (i = 0; i < 16; i++) {
+                struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
+                if (reg->obj)
+                        i915_gem_clear_fence_reg(reg->obj);
+        }
+}
+
 void i915_gem_reset(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_i915_gem_object *obj;
-        int i;
 
         i915_gem_reset_ring_lists(dev_priv, &dev_priv->render_ring);
         i915_gem_reset_ring_lists(dev_priv, &dev_priv->bsd_ring);
@@ -1940,15 +1951,7 @@ void i915_gem_reset(struct drm_device *dev)
         }
 
         /* The fence registers are invalidated so clear them out */
-        for (i = 0; i < 16; i++) {
-                struct drm_i915_fence_reg *reg;
-
-                reg = &dev_priv->fence_regs[i];
-                if (!reg->obj)
-                        continue;
-
-                i915_gem_clear_fence_reg(reg->obj);
-        }
+        i915_gem_reset_fences(dev);
 }
 
 /**
@@ -4706,6 +4709,8 @@ i915_gem_idle(struct drm_device *dev)
                 }
         }
 
+        i915_gem_reset_fences(dev);
+
         /* Hack!  Don't let anybody do execbuf while we don't control the chip.
          * We need to replace this with a semaphore, or something.
          * And not confound mm.suspended!