[PATCH v6 13/20] drm/i915/vm_bind: Update i915_vma_verify_bind_complete()

[Niranjana Vishwanathapura]

Ensure i915_vma_verify_bind_complete() handles case where bind
is not initiated. Also make it non static, add documentation
and move it out of CONFIG_DRM_I915_DEBUG_GEM.

v2: Fix fence leak

Reviewed-by: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_vma.c | 22 ++++++++++++++++------
 drivers/gpu/drm/i915/i915_vma.h |  1 +
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index eaa13e9ba966..aa4705246993 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -439,12 +439,25 @@ int i915_vma_sync(struct i915_vma *vma)
 	return i915_vm_sync(vma->vm);
 }
 
-#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
-static int i915_vma_verify_bind_complete(struct i915_vma *vma)
+/**
+ * i915_vma_verify_bind_complete() - Check for the bind completion of the vma
+ * @vma: vma to check for bind completion
+ *
+ * As the fence reference is obtained under RCU, no locking is required by
+ * the caller.
+ *
+ * Returns: 0 if the vma bind is completed. Error code otherwise.
+ */
+int i915_vma_verify_bind_complete(struct i915_vma *vma)
 {
-	struct dma_fence *fence = i915_active_fence_get(&vma->active.excl);
+	struct dma_fence *fence;
 	int err;
 
+	/* Ensure vma bind is initiated */
+	if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK))
+		return -EINVAL;
+
+	fence = i915_active_fence_get(&vma->active.excl);
 	if (!fence)
 		return 0;
 
@@ -457,9 +470,6 @@ static int i915_vma_verify_bind_complete(struct i915_vma *vma)
 
 	return err;
 }
-#else
-#define i915_vma_verify_bind_complete(_vma) 0
-#endif
 
 I915_SELFTEST_EXPORT void
 i915_vma_resource_init_from_vma(struct i915_vma_resource *vma_res,
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 1cadbf8fdedf..04770f8ba815 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -440,6 +440,7 @@ void i915_vma_make_purgeable(struct i915_vma *vma);
 
 int i915_vma_wait_for_bind(struct i915_vma *vma);
 int i915_vma_sync(struct i915_vma *vma);
+int i915_vma_verify_bind_complete(struct i915_vma *vma);
 
 /**
  * i915_vma_get_current_resource - Get the current resource of the vma
-- 
2.21.0.rc0.32.g243a4c7e27