drm/i915: Rename i915_gem_context_reference/unreference()

As these are wrappers around kref_get/kref_put() it is preferable to
follow the naming convention and use the same verb get/put in our
wrapper names for manipulating a reference to the context.

s/i915_gem_context_reference/i915_gem_context_get/
s/i915_gem_context_unreference/i915_gem_context_put/
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469005202-9659-3-git-send-email-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/1469017917-15134-2-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -3338,12 +3338,14 @@ i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id)
 	return ctx;
 }
 
-static inline void i915_gem_context_reference(struct i915_gem_context *ctx)
+static inline struct i915_gem_context *
+i915_gem_context_get(struct i915_gem_context *ctx)
 {
 	kref_get(&ctx->ref);
+	return ctx;
 }
 
-static inline void i915_gem_context_unreference(struct i915_gem_context *ctx)
+static inline void i915_gem_context_put(struct i915_gem_context *ctx)
 {
 	lockdep_assert_held(&ctx->i915->drm.struct_mutex);
 	kref_put(&ctx->ref, i915_gem_context_free);

drivers/gpu/drm/i915/i915_gem_context.c

@@ -305,7 +305,7 @@ __create_hw_context(struct drm_device *dev,
 	return ctx;
 
 err_out:
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 	return ERR_PTR(ret);
 }
 
@@ -333,7 +333,7 @@ i915_gem_create_context(struct drm_device *dev,
 			DRM_DEBUG_DRIVER("PPGTT setup failed (%ld)\n",
 					 PTR_ERR(ppgtt));
 			idr_remove(&file_priv->context_idr, ctx->user_handle);
-			i915_gem_context_unreference(ctx);
+			i915_gem_context_put(ctx);
 			return ERR_CAST(ppgtt);
 		}
 
@@ -390,7 +390,7 @@ static void i915_gem_context_unpin(struct i915_gem_context *ctx,
 		if (ce->state)
 			i915_gem_object_ggtt_unpin(ce->state);
 
-		i915_gem_context_unreference(ctx);
+		i915_gem_context_put(ctx);
 	}
 }
 
@@ -504,7 +504,7 @@ void i915_gem_context_fini(struct drm_device *dev)
 
 	lockdep_assert_held(&dev->struct_mutex);
 
-	i915_gem_context_unreference(dctx);
+	i915_gem_context_put(dctx);
 	dev_priv->kernel_context = NULL;
 
 	ida_destroy(&dev_priv->context_hw_ida);
@@ -515,7 +515,7 @@ static int context_idr_cleanup(int id, void *p, void *data)
 	struct i915_gem_context *ctx = p;
 
 	ctx->file_priv = ERR_PTR(-EBADF);
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 	return 0;
 }
 
@@ -827,10 +827,9 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
 
 		/* obj is kept alive until the next request by its active ref */
 		i915_gem_object_ggtt_unpin(from->engine[RCS].state);
-		i915_gem_context_unreference(from);
+		i915_gem_context_put(from);
 	}
-	i915_gem_context_reference(to);
-	engine->last_context = to;
+	engine->last_context = i915_gem_context_get(to);
 
 	/* GEN8 does *not* require an explicit reload if the PDPs have been
 	 * setup, and we do not wish to move them.
@@ -914,10 +913,9 @@ int i915_switch_context(struct drm_i915_gem_request *req)
 		}
 
 		if (to != engine->last_context) {
-			i915_gem_context_reference(to);
 			if (engine->last_context)
-				i915_gem_context_unreference(engine->last_context);
-			engine->last_context = to;
+				i915_gem_context_put(engine->last_context);
+			engine->last_context = i915_gem_context_get(to);
 		}
 
 		return 0;
@@ -1014,7 +1012,7 @@ int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
 	}
 
 	idr_remove(&file_priv->context_idr, ctx->user_handle);
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 	mutex_unlock(&dev->struct_mutex);
 
 	DRM_DEBUG_DRIVER("HW context %d destroyed\n", args->ctx_id);

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -1509,7 +1509,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		goto pre_mutex_err;
 	}
 
-	i915_gem_context_reference(ctx);
+	i915_gem_context_get(ctx);
 
 	if (ctx->ppgtt)
 		vm = &ctx->ppgtt->base;
@@ -1520,7 +1520,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 	eb = eb_create(args);
 	if (eb == NULL) {
-		i915_gem_context_unreference(ctx);
+		i915_gem_context_put(ctx);
 		mutex_unlock(&dev->struct_mutex);
 		ret = -ENOMEM;
 		goto pre_mutex_err;
@@ -1664,7 +1664,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 err:
 	/* the request owns the ref now */
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 	eb_destroy(eb);
 
 	mutex_unlock(&dev->struct_mutex);

drivers/gpu/drm/i915/i915_gem_request.c

@@ -180,7 +180,7 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request)
 					       request->engine);
 	}
 
-	i915_gem_context_unreference(request->ctx);
+	i915_gem_context_put(request->ctx);
 	i915_gem_request_put(request);
 }
 
@@ -341,8 +341,7 @@ __i915_gem_request_alloc(struct intel_engine_cs *engine,
 
 	req->i915 = dev_priv;
 	req->engine = engine;
-	req->ctx = ctx;
-	i915_gem_context_reference(ctx);
+	req->ctx = i915_gem_context_get(ctx);
 
 	/*
 	 * Reserve space in the ring buffer for all the commands required to
@@ -364,7 +363,7 @@ __i915_gem_request_alloc(struct intel_engine_cs *engine,
 	return 0;
 
 err_ctx:
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 err:
 	kmem_cache_free(dev_priv->requests, req);
 	return ret;

drivers/gpu/drm/i915/intel_lrc.c

@@ -980,7 +980,6 @@ static int intel_lr_context_pin(struct i915_gem_context *ctx,
 	if (ret)
 		goto unpin_map;
 
-	i915_gem_context_reference(ctx);
 	ce->lrc_vma = i915_gem_obj_to_ggtt(ce->state);
 	intel_lr_context_descriptor_update(ctx, engine);
 
@@ -992,6 +991,7 @@ static int intel_lr_context_pin(struct i915_gem_context *ctx,
 	if (i915.enable_guc_submission)
 		I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE);
 
+	i915_gem_context_get(ctx);
 	return 0;
 
 unpin_map:
@@ -1023,7 +1023,7 @@ void intel_lr_context_unpin(struct i915_gem_context *ctx,
 	ce->lrc_desc = 0;
 	ce->lrc_reg_state = NULL;
 
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 }
 
 static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -2139,7 +2139,7 @@ static int intel_ring_context_pin(struct i915_gem_context *ctx,
 	if (ctx == ctx->i915->kernel_context)
 		ce->initialised = true;
 
-	i915_gem_context_reference(ctx);
+	i915_gem_context_get(ctx);
 	return 0;
 
 error:
@@ -2160,7 +2160,7 @@ static void intel_ring_context_unpin(struct i915_gem_context *ctx,
 	if (ce->state)
 		i915_gem_object_ggtt_unpin(ce->state);
 
-	i915_gem_context_unreference(ctx);
+	i915_gem_context_put(ctx);
 }
 
 static int intel_init_ring_buffer(struct intel_engine_cs *engine)