[PATCH 28/37] drm/i915: Consolidate i915_vma_unpin_and_release()

[Chris Wilson]

In a few places, we repeat a call to clear a pointer to a vma whilst
unpinning and releasing a reference to its owner. Refactor those into a
common function.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c        | 12 ++++++++++++
 drivers/gpu/drm/i915/i915_gem_gtt.h        |  1 +
 drivers/gpu/drm/i915/i915_guc_submission.c | 21 ++++-----------------
 drivers/gpu/drm/i915/intel_engine_cs.c     |  9 +--------
 drivers/gpu/drm/i915/intel_lrc.c           |  9 +--------
 drivers/gpu/drm/i915/intel_ringbuffer.c    |  8 +-------
 6 files changed, 20 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 738a474c5afa..d15eb1d71341 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3674,3 +3674,15 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 	__i915_vma_pin(vma);
 	return ptr;
 }
+
+void i915_vma_unpin_and_release(struct i915_vma **p_vma)
+{
+	struct i915_vma *vma;
+
+	vma = fetch_and_zero(p_vma);
+	if (!vma)
+		return;
+
+	i915_vma_unpin(vma);
+	i915_vma_put(vma);
+}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index a2691943a404..ec538fcc9c20 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -232,6 +232,7 @@ struct i915_vma *
 i915_vma_create(struct drm_i915_gem_object *obj,
 		struct i915_address_space *vm,
 		const struct i915_ggtt_view *view);
+void i915_vma_unpin_and_release(struct i915_vma **p_vma);
 
 static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
 {
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 7227f97d8040..75db2da76b41 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -651,19 +651,6 @@ err:
 	return vma;
 }
 
-/**
- * guc_release_vma() - Release gem object allocated for GuC usage
- * @vma:	gem obj to be released
- */
-static void guc_release_vma(struct i915_vma *vma)
-{
-	if (!vma)
-		return;
-
-	i915_vma_unpin(vma);
-	i915_vma_put(vma);
-}
-
 static void
 guc_client_free(struct drm_i915_private *dev_priv,
 		struct i915_guc_client *client)
@@ -688,7 +675,7 @@ guc_client_free(struct drm_i915_private *dev_priv,
 		kunmap(kmap_to_page(client->client_base));
 	}
 
-	guc_release_vma(client->vma);
+	i915_vma_unpin_and_release(&client->vma);
 
 	if (client->ctx_index != GUC_INVALID_CTX_ID) {
 		guc_fini_ctx_desc(guc, client);
@@ -1046,12 +1033,12 @@ void i915_guc_submission_fini(struct drm_i915_private *dev_priv)
 {
 	struct intel_guc *guc = &dev_priv->guc;
 
-	guc_release_vma(fetch_and_zero(&guc->ads_vma));
-	guc_release_vma(fetch_and_zero(&guc->log_vma));
+	i915_vma_unpin_and_release(&guc->ads_vma);
+	i915_vma_unpin_and_release(&guc->log_vma);
 
 	if (guc->ctx_pool_vma)
 		ida_destroy(&guc->ctx_ids);
-	guc_release_vma(fetch_and_zero(&guc->ctx_pool_vma));
+	i915_vma_unpin_and_release(&guc->ctx_pool_vma);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 573f642a74f8..f02d66bbec4b 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -279,14 +279,7 @@ err_unref:
 
 static void intel_engine_cleanup_scratch(struct intel_engine_cs *engine)
 {
-	struct i915_vma *vma;
-
-	vma = fetch_and_zero(&engine->scratch);
-	if (!vma)
-		return;
-
-	i915_vma_unpin(vma);
-	i915_vma_put(vma);
+	i915_vma_unpin_and_release(&engine->scratch);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ae39ae771ad9..4b9beaa30023 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1193,14 +1193,7 @@ err:
 
 static void lrc_destroy_wa_ctx_obj(struct intel_engine_cs *engine)
 {
-	struct i915_vma *vma;
-
-	vma = fetch_and_zero(&engine->wa_ctx.vma);
-	if (!vma)
-		return;
-
-	i915_vma_unpin(vma);
-	i915_vma_put(vma);
+	i915_vma_unpin_and_release(&engine->wa_ctx.vma);
 }
 
 static int intel_init_workaround_bb(struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index a5619a81d284..d618d05249f3 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1257,14 +1257,8 @@ static int init_render_ring(struct intel_engine_cs *engine)
 static void render_ring_cleanup(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = engine->i915;
-	struct i915_vma *vma;
-
-	vma = fetch_and_zero(&dev_priv->semaphore);
-	if (!vma)
-		return;
 
-	i915_vma_unpin(vma);
-	i915_vma_put(vma);
+	i915_vma_unpin_and_release(&dev_priv->semaphore);
 }
 
 static int gen8_rcs_signal(struct drm_i915_gem_request *req)
-- 
2.8.1