drm/i915: tidy up a few leftovers

There are a few bits of code which the transformations implemented by
the previous patch reveal to be suboptimal, once the notion of a per-
ring default context has gone away. So this tidies up the leftovers.

It could have been squashed into the previous patch, but that would have
made that patch less clearly a simple transformation. In particular, any
change which alters the code block structure or indentation has been
deferred into this separate patch, because such things tend to make
diffs more difficult to read.

v4:	Rebased
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453230175-19330-4-git-send-email-david.s.gordon@intel.comSigned-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1960,11 +1960,8 @@ static int i915_context_status(struct seq_file *m, void *unused)
 
 		seq_puts(m, "HW context ");
 		describe_ctx(m, ctx);
-		for_each_ring(ring, dev_priv, i) {
-			if (dev_priv->kernel_context == ctx)
-				seq_printf(m, "(default context %s) ",
-					   ring->name);
-		}
+		if (ctx == dev_priv->kernel_context)
+			seq_printf(m, "(kernel context) ");
 
 		if (i915.enable_execlists) {
 			seq_putc(m, '\n');
@@ -2056,12 +2053,10 @@ static int i915_dump_lrc(struct seq_file *m, void *unused)
 	if (ret)
 		return ret;
 
-	list_for_each_entry(ctx, &dev_priv->context_list, link) {
-		for_each_ring(ring, dev_priv, i) {
-			if (dev_priv->kernel_context != ctx)
+	list_for_each_entry(ctx, &dev_priv->context_list, link)
+		if (ctx != dev_priv->kernel_context)
+			for_each_ring(ring, dev_priv, i)
 				i915_dump_lrc_obj(m, ctx, ring);
-		}
-	}
 
 	mutex_unlock(&dev->struct_mutex);
 

drivers/gpu/drm/i915/i915_gem.c

@@ -2679,10 +2679,8 @@ void i915_gem_request_free(struct kref *req_ref)
 		i915_gem_request_remove_from_client(req);
 
 	if (ctx) {
-		if (i915.enable_execlists) {
-			if (ctx != req->i915->kernel_context)
+		if (i915.enable_execlists && ctx != req->i915->kernel_context)
 			intel_lr_context_unpin(req);
-		}
 
 		i915_gem_context_unreference(ctx);
 	}

drivers/gpu/drm/i915/intel_lrc.c

@@ -686,16 +686,10 @@ static int execlists_move_to_gpu(struct drm_i915_gem_request *req,
 
 int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
 {
-	int ret;
+	int ret = 0;
 
 	request->ringbuf = request->ctx->engine[request->ring->id].ringbuf;
 
-	if (request->ctx != request->i915->kernel_context) {
-		ret = intel_lr_context_pin(request);
-		if (ret)
-			return ret;
-	}
-
 	if (i915.enable_guc_submission) {
 		/*
 		 * Check that the GuC has space for the request before
@@ -709,7 +703,10 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
 			return ret;
 	}
 
-	return 0;
+	if (request->ctx != request->i915->kernel_context)
+		ret = intel_lr_context_pin(request);
+
+	return ret;
 }
 
 static int logical_ring_wait_for_space(struct drm_i915_gem_request *req,
@@ -2391,23 +2388,22 @@ void intel_lr_context_free(struct intel_context *ctx)
 {
 	int i;
 
-	for (i = 0; i < I915_NUM_RINGS; i++) {
+	for (i = I915_NUM_RINGS; --i >= 0; ) {
+		struct intel_ringbuffer *ringbuf = ctx->engine[i].ringbuf;
 		struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state;
 
-		if (ctx_obj) {
-			struct intel_ringbuffer *ringbuf =
-					ctx->engine[i].ringbuf;
-			struct intel_engine_cs *ring = ringbuf->ring;
+		if (!ctx_obj)
+			continue;
 
 		if (ctx == ctx->i915->kernel_context) {
 			intel_unpin_ringbuffer_obj(ringbuf);
 			i915_gem_object_ggtt_unpin(ctx_obj);
 		}
-			WARN_ON(ctx->engine[ring->id].pin_count);
+
+		WARN_ON(ctx->engine[i].pin_count);
 		intel_ringbuffer_free(ringbuf);
 		drm_gem_object_unreference(&ctx_obj->base);
 	}
-	}
 }
 
 /**