[PATCH v3 1/6] drm/i915: Add functions to set/get moving fence

[Thomas Hellström]

From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

We want to get rid of i915_vma tracking to simplify the code and
lifetimes. Add a way to set/put the moving fence, in preparation for
removing the tracking.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.c | 37 ++++++++++++++++++++++
 drivers/gpu/drm/i915/gem/i915_gem_object.h |  9 ++++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 591ee3cb7275..ec4313836597 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -33,6 +33,7 @@
 #include "i915_gem_object.h"
 #include "i915_memcpy.h"
 #include "i915_trace.h"
+#include "i915_gem_ttm.h"
 
 static struct kmem_cache *slab_objects;
 
@@ -726,6 +727,42 @@ static const struct drm_gem_object_funcs i915_gem_object_funcs = {
 	.export = i915_gem_prime_export,
 };
 
+struct dma_fence *
+i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj)
+{
+	return dma_fence_get(i915_gem_to_ttm(obj)->moving);
+}
+
+void i915_gem_object_set_moving_fence(struct drm_i915_gem_object *obj,
+				      struct dma_fence *fence)
+{
+	dma_fence_put(i915_gem_to_ttm(obj)->moving);
+
+	i915_gem_to_ttm(obj)->moving = dma_fence_get(fence);
+}
+
+int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
+				      bool intr)
+{
+	struct dma_fence *fence = i915_gem_to_ttm(obj)->moving;
+	int ret;
+
+	assert_object_held(obj);
+	if (!fence)
+		return 0;
+
+	ret = dma_fence_wait(fence, intr);
+	if (ret)
+		return ret;
+
+	if (fence->error)
+		return fence->error;
+
+	i915_gem_to_ttm(obj)->moving = NULL;
+	dma_fence_put(fence);
+	return 0;
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/huge_gem_object.c"
 #include "selftests/huge_pages.c"
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 133963b46135..36bf3e2e602f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -517,6 +517,15 @@ i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
 	i915_gem_object_unpin_pages(obj);
 }
 
+struct dma_fence *
+i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj);
+
+void i915_gem_object_set_moving_fence(struct drm_i915_gem_object *obj,
+				      struct dma_fence *fence);
+
+int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
+				      bool intr);
+
 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
 					 unsigned int cache_level);
 bool i915_gem_object_can_bypass_llc(struct drm_i915_gem_object *obj);
-- 
2.31.1