[Intel-gfx] [RFCv3 14/15] drm/i915: factor out and expose i915_steal_fence()

[Zhi Wang]

Factor out and expose fence stealing functionality for GVT-g. GVT-g
will use i915_find_fence_reg() to find a free/unpin fence register
and use i915_steal_fence() to steal it.

Signed-off-by: Zhi Wang <zhi.a.w...@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |  1 +
 drivers/gpu/drm/i915/i915_gem_fence.c | 36 ++++++++++++++++++++++++++---------
 2 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 26106e5..deb7143b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3247,6 +3247,7 @@ i915_gem_object_ggtt_unpin(struct drm_i915_gem_object 
*obj)
 /* i915_gem_fence.c */
 int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj);
 int __must_check i915_gem_object_put_fence(struct drm_i915_gem_object *obj);
+int i915_steal_fence(struct drm_i915_fence_reg *reg);
 
 bool i915_gem_object_pin_fence(struct drm_i915_gem_object *obj);
 void i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj);
diff --git a/drivers/gpu/drm/i915/i915_gem_fence.c 
b/drivers/gpu/drm/i915/i915_gem_fence.c
index 5981985..dd897c6 100644
--- a/drivers/gpu/drm/i915/i915_gem_fence.c
+++ b/drivers/gpu/drm/i915/i915_gem_fence.c
@@ -346,6 +346,30 @@ deadlock:
 }
 
 /**
+ * i915_steal_fence - steal a fence from a GEM object
+ * @reg: the fence register to be stolen
+ *
+ * Returns:
+ *
+ * 0 on success, negative error code on failure.
+ */
+int i915_steal_fence(struct drm_i915_fence_reg *reg)
+{
+       int ret;
+
+       if (reg->obj) {
+               struct drm_i915_gem_object *old = reg->obj;
+
+               ret = i915_gem_object_wait_fence(old);
+               if (ret)
+                       return ret;
+
+               i915_gem_object_fence_lost(old);
+       }
+       return 0;
+}
+
+/**
  * i915_gem_object_get_fence - set up fencing for an object
  * @obj: object to map through a fence reg
  *
@@ -397,15 +421,9 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
                if (IS_ERR(reg))
                        return PTR_ERR(reg);
 
-               if (reg->obj) {
-                       struct drm_i915_gem_object *old = reg->obj;
-
-                       ret = i915_gem_object_wait_fence(old);
-                       if (ret)
-                               return ret;
-
-                       i915_gem_object_fence_lost(old);
-               }
+               ret = i915_steal_fence(reg);
+               if (ret)
+                       return ret;
        } else
                return 0;
 
-- 
1.9.1

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