[Intel-gfx] [PATCH v2 2/6] drm/i915: Move legacy kernel context pinning to intel_ringbuffer.c

[Chris Wilson]

This is so that we have symmetry with intel_lrc.c and avoid a source of
if (i915.enable_execlists) layering violation within i915_gem_context.c -
that is we move the specific handling of the dev_priv->kernel_context
for legacy submission into the legacy submission code.

This depends upon the init/fini ordering between contexts and engines
already defined by intel_lrc.c, and also exporting the context alignment
required for pinning the legacy context.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h         |  2 ++
 drivers/gpu/drm/i915/i915_gem_context.c | 27 +++------------------------
 drivers/gpu/drm/i915/intel_ringbuffer.c | 31 +++++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e4c8e341655c..19d0194c728f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -867,6 +867,8 @@ struct i915_gem_context {
 	u32 user_handle;
 #define CONTEXT_NO_ZEROMAP		(1<<0)
 
+	u32 ggtt_alignment;
+
 	struct intel_context {
 		struct drm_i915_gem_object *state;
 		struct intel_ringbuffer *ringbuf;
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index a3b11aac23a4..c620fe6c9d96 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -268,6 +268,8 @@ __create_hw_context(struct drm_device *dev,
 	list_add_tail(&ctx->link, &dev_priv->context_list);
 	ctx->i915 = dev_priv;
 
+	ctx->ggtt_alignment = get_context_alignment(dev_priv);
+
 	if (dev_priv->hw_context_size) {
 		struct drm_i915_gem_object *obj =
 				i915_gem_alloc_context_obj(dev, dev_priv->hw_context_size);
@@ -413,26 +415,6 @@ int i915_gem_context_init(struct drm_device *dev)
 		return PTR_ERR(ctx);
 	}
 
-	if (!i915.enable_execlists && ctx->engine[RCS].state) {
-		int ret;
-
-		/* We may need to do things with the shrinker which
-		 * require us to immediately switch back to the default
-		 * context. This can cause a problem as pinning the
-		 * default context also requires GTT space which may not
-		 * be available. To avoid this we always pin the default
-		 * context.
-		 */
-		ret = i915_gem_obj_ggtt_pin(ctx->engine[RCS].state,
-					    get_context_alignment(dev_priv), 0);
-		if (ret) {
-			DRM_ERROR("Failed to pinned default global context (error %d)\n",
-				  ret);
-			i915_gem_context_unreference(ctx);
-			return ret;
-		}
-	}
-
 	dev_priv->kernel_context = ctx;
 
 	DRM_DEBUG_DRIVER("%s context support initialized\n",
@@ -469,9 +451,6 @@ void i915_gem_context_fini(struct drm_device *dev)
 
 	lockdep_assert_held(&dev->struct_mutex);
 
-	if (!i915.enable_execlists && dctx->engine[RCS].state)
-		i915_gem_object_ggtt_unpin(dctx->engine[RCS].state);
-
 	i915_gem_context_unreference(dctx);
 	dev_priv->kernel_context = NULL;
 
@@ -721,7 +700,7 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
 
 	/* Trying to pin first makes error handling easier. */
 	ret = i915_gem_obj_ggtt_pin(to->engine[RCS].state,
-				    get_context_alignment(engine->i915),
+				    to->ggtt_alignment,
 				    0);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8d35a3978f9b..4e0aa7e9d5da 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2244,6 +2244,8 @@ static int intel_init_ring_buffer(struct drm_device *dev,
 				  struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct i915_gem_context *kctx = dev_priv->kernel_context;
+	struct intel_context *ce = &kctx->engine[engine->id];
 	struct intel_ringbuffer *ringbuf;
 	int ret;
 
@@ -2260,6 +2262,25 @@ static int intel_init_ring_buffer(struct drm_device *dev,
 
 	init_waitqueue_head(&engine->irq_queue);
 
+	if (ce->state) {
+		i915_gem_context_reference(kctx);
+
+		/* We may need to do things with the shrinker which
+		 * require us to immediately switch back to the default
+		 * context. This can cause a problem as pinning the
+		 * default context also requires GTT space which may not
+		 * be available. To avoid this we always pin the default
+		 * context.
+		 */
+		ret = i915_gem_obj_ggtt_pin(ce->state,
+					    kctx->ggtt_alignment,
+					    0);
+		if (ret)
+			goto error;
+
+		ce->initialised = false;
+	}
+
 	ringbuf = intel_engine_create_ringbuffer(engine, 32 * PAGE_SIZE);
 	if (IS_ERR(ringbuf)) {
 		ret = PTR_ERR(ringbuf);
@@ -2300,6 +2321,8 @@ error:
 void intel_cleanup_engine(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv;
+	struct i915_gem_context *kctx;
+	struct intel_context *ce;
 
 	if (!intel_engine_initialized(engine))
 		return;
@@ -2327,6 +2350,14 @@ void intel_cleanup_engine(struct intel_engine_cs *engine)
 
 	i915_cmd_parser_fini_ring(engine);
 	i915_gem_batch_pool_fini(&engine->batch_pool);
+
+	kctx = dev_priv->kernel_context;
+	ce = &kctx->engine[engine->id];
+	if (ce->state) {
+		i915_gem_object_ggtt_unpin(ce->state);
+		i915_gem_context_unreference(kctx);
+	}
+
 	engine->i915 = NULL;
 }
 
-- 
2.8.1