[PATCH 091/190] drm/i915: Move context initialisation to first-use

[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

Instead of allocating a new request when allocating a context, use the
request that initiated the allocation to emit the context
initialisation.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.h  |  1 +
 drivers/gpu/drm/i915/intel_lrc.c | 42 ++++++++++++++++------------------------
 2 files changed, 18 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4e912fd3b8c6..f5f457920944 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -885,6 +885,7 @@ struct intel_context {
 		struct drm_i915_gem_object *state;
 		struct intel_ring *ring;
 		int pin_count;
+		bool initialised;
 	} engine[I915_NUM_RINGS];
 
 	struct list_head link;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 31fbb482d15c..f892e658cd4b 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -482,14 +482,9 @@ static int execlists_context_queue(struct drm_i915_gem_request *request)
 
 int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
 {
+	struct intel_engine_cs *engine = request->engine;
 	int ret;
 
-	request->ring = request->ctx->engine[request->engine->id].ring;
-
-	ret = intel_lr_context_pin(request->ctx, request->engine);
-	if (ret)
-		return ret;
-
 	if (i915.enable_guc_submission) {
 		/*
 		 * Check that the GuC has space for the request before
@@ -503,6 +498,21 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
 			return ret;
 	}
 
+	request->ring = request->ctx->engine[engine->id].ring;
+
+	ret = intel_lr_context_pin(request->ctx, engine);
+	if (ret)
+		return ret;
+
+	if (!request->ctx->engine[engine->id].initialised) {
+		ret = engine->init_context(request);
+		if (ret) {
+			intel_lr_context_unpin(request->ctx, engine);
+			return ret;
+		}
+		request->ctx->engine[engine->id].initialised = true;
+	}
+
 	return 0;
 }
 
@@ -1968,26 +1978,8 @@ int intel_lr_context_deferred_alloc(struct intel_context *ctx,
 
 	ctx->engine[engine->id].ring = ring;
 	ctx->engine[engine->id].state = ctx_obj;
+	ctx->engine[engine->id].initialised = engine->init_context == NULL;
 
-	if (ctx != engine->default_context && engine->init_context) {
-		struct drm_i915_gem_request *req;
-
-		req = i915_gem_request_alloc(engine, ctx);
-		if (IS_ERR(req)) {
-			DRM_ERROR("ring create req: %d\n",
-				ret);
-			goto error_ringbuf;
-		}
-
-		ret = engine->init_context(req);
-		if (ret) {
-			DRM_ERROR("ring init context: %d\n",
-				ret);
-			i915_gem_request_cancel(req);
-			goto error_ringbuf;
-		}
-		i915_add_request_no_flush(req);
-	}
 	return 0;
 
 error_ringbuf:
-- 
2.7.0.rc3

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