drm/i915: Unify legacy/execlists submit_execbuf callbacks

Now that emitting requests is identical between legacy and execlists, we
can use the same function to build up the ring for submitting to either
engine. (With the exception of i915_switch_contexts(), but in time that
will also be handled gracefully.)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469432687-22756-30-git-send-email-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/1470174640-18242-21-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -1705,18 +1705,6 @@ struct i915_virtual_gpu {
 	bool active;
 };
 
-struct i915_execbuffer_params {
-	struct drm_device               *dev;
-	struct drm_file                 *file;
-	uint32_t                        dispatch_flags;
-	uint32_t                        args_batch_start_offset;
-	uint64_t                        batch_obj_vm_offset;
-	struct intel_engine_cs *engine;
-	struct drm_i915_gem_object      *batch_obj;
-	struct i915_gem_context            *ctx;
-	struct drm_i915_gem_request     *request;
-};
-
 /* used in computing the new watermarks state */
 struct intel_wm_config {
 	unsigned int num_pipes_active;
@@ -2016,9 +2004,6 @@ struct drm_i915_private {
 
 	/* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
 	struct {
-		int (*execbuf_submit)(struct i915_execbuffer_params *params,
-				      struct drm_i915_gem_execbuffer2 *args,
-				      struct list_head *vmas);
 		void (*cleanup_engine)(struct intel_engine_cs *engine);
 		void (*stop_engine)(struct intel_engine_cs *engine);
 
@@ -2993,11 +2978,6 @@ int i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 			      struct drm_file *file_priv);
 int i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
 			     struct drm_file *file_priv);
-void i915_gem_execbuffer_move_to_active(struct list_head *vmas,
-					struct drm_i915_gem_request *req);
-int i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
-				   struct drm_i915_gem_execbuffer2 *args,
-				   struct list_head *vmas);
 int i915_gem_execbuffer(struct drm_device *dev, void *data,
 			struct drm_file *file_priv);
 int i915_gem_execbuffer2(struct drm_device *dev, void *data,

drivers/gpu/drm/i915/i915_gem.c

@@ -4534,11 +4534,9 @@ int i915_gem_init(struct drm_device *dev)
 	mutex_lock(&dev->struct_mutex);
 
 	if (!i915.enable_execlists) {
-		dev_priv->gt.execbuf_submit = i915_gem_ringbuffer_submission;
 		dev_priv->gt.cleanup_engine = intel_engine_cleanup;
 		dev_priv->gt.stop_engine = intel_engine_stop;
 	} else {
-		dev_priv->gt.execbuf_submit = intel_execlists_submission;
 		dev_priv->gt.cleanup_engine = intel_logical_ring_cleanup;
 		dev_priv->gt.stop_engine = intel_logical_ring_stop;
 	}

drivers/gpu/drm/i915/i915_gem_context.c

@@ -894,8 +894,9 @@ int i915_switch_context(struct drm_i915_gem_request *req)
 {
 	struct intel_engine_cs *engine = req->engine;
 
-	WARN_ON(i915.enable_execlists);
 	lockdep_assert_held(&req->i915->drm.struct_mutex);
+	if (i915.enable_execlists)
+		return 0;
 
 	if (!req->ctx->engine[engine->id].state) {
 		struct i915_gem_context *to = req->ctx;
@@ -943,9 +944,7 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
 		if (IS_ERR(req))
 			return PTR_ERR(req);
 
-		ret = 0;
-		if (!i915.enable_execlists)
-			ret = i915_switch_context(req);
+		ret = i915_switch_context(req);
 		i915_add_request_no_flush(req);
 		if (ret)
 			return ret;

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -42,6 +42,18 @@
 
 #define BATCH_OFFSET_BIAS (256*1024)
 
+struct i915_execbuffer_params {
+	struct drm_device               *dev;
+	struct drm_file                 *file;
+	u32				 dispatch_flags;
+	u32				 args_batch_start_offset;
+	u32				 batch_obj_vm_offset;
+	struct intel_engine_cs          *engine;
+	struct drm_i915_gem_object      *batch_obj;
+	struct i915_gem_context         *ctx;
+	struct drm_i915_gem_request     *request;
+};
+
 struct eb_vmas {
 	struct list_head vmas;
 	int and;
@@ -1117,7 +1129,7 @@ i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
 	return ctx;
 }
 
-void
+static void
 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 				   struct drm_i915_gem_request *req)
 {
@@ -1244,10 +1256,10 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *engine,
 		return ERR_PTR(ret);
 }
 
-int
-i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
-			       struct drm_i915_gem_execbuffer2 *args,
-			       struct list_head *vmas)
+static int
+execbuf_submit(struct i915_execbuffer_params *params,
+	       struct drm_i915_gem_execbuffer2 *args,
+	       struct list_head *vmas)
 {
 	struct drm_i915_private *dev_priv = params->request->i915;
 	u64 exec_start, exec_len;
@@ -1637,7 +1649,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	params->batch_obj               = batch_obj;
 	params->ctx                     = ctx;
 
-	ret = dev_priv->gt.execbuf_submit(params, args, &eb->vmas);
+	ret = execbuf_submit(params, args, &eb->vmas);
 err_request:
 	i915_gem_execbuffer_retire_commands(params);
 

drivers/gpu/drm/i915/intel_lrc.c

@@ -642,39 +642,6 @@ static void execlists_submit_request(struct drm_i915_gem_request *request)
 	spin_unlock_bh(&engine->execlist_lock);
 }
 
-static int execlists_move_to_gpu(struct drm_i915_gem_request *req,
-				 struct list_head *vmas)
-{
-	const unsigned other_rings = ~intel_engine_flag(req->engine);
-	struct i915_vma *vma;
-	uint32_t flush_domains = 0;
-	bool flush_chipset = false;
-	int ret;
-
-	list_for_each_entry(vma, vmas, exec_list) {
-		struct drm_i915_gem_object *obj = vma->obj;
-
-		if (obj->active & other_rings) {
-			ret = i915_gem_object_sync(obj, req);
-			if (ret)
-				return ret;
-		}
-
-		if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
-			flush_chipset |= i915_gem_clflush_object(obj, false);
-
-		flush_domains |= obj->base.write_domain;
-	}
-
-	if (flush_domains & I915_GEM_DOMAIN_GTT)
-		wmb();
-
-	/* Unconditionally invalidate gpu caches and ensure that we do flush
-	 * any residual writes from the previous batch.
-	 */
-	return req->engine->emit_flush(req, EMIT_INVALIDATE);
-}
-
 int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
 {
 	struct intel_engine_cs *engine = request->engine;
@@ -776,96 +743,6 @@ intel_logical_ring_advance(struct drm_i915_gem_request *request)
 	return 0;
 }
 
-/**
- * intel_execlists_submission() - submit a batchbuffer for execution, Execlists style
- * @params: execbuffer call parameters.
- * @args: execbuffer call arguments.
- * @vmas: list of vmas.
- *
- * This is the evil twin version of i915_gem_ringbuffer_submission. It abstracts
- * away the submission details of the execbuffer ioctl call.
- *
- * Return: non-zero if the submission fails.
- */
-int intel_execlists_submission(struct i915_execbuffer_params *params,
-			       struct drm_i915_gem_execbuffer2 *args,
-			       struct list_head *vmas)
-{
-	struct drm_device       *dev = params->dev;
-	struct intel_engine_cs *engine = params->engine;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_ring *ring = params->request->ring;
-	u64 exec_start;
-	int instp_mode;
-	u32 instp_mask;
-	int ret;
-
-	instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
-	instp_mask = I915_EXEC_CONSTANTS_MASK;
-	switch (instp_mode) {
-	case I915_EXEC_CONSTANTS_REL_GENERAL:
-	case I915_EXEC_CONSTANTS_ABSOLUTE:
-	case I915_EXEC_CONSTANTS_REL_SURFACE:
-		if (instp_mode != 0 && engine->id != RCS) {
-			DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
-			return -EINVAL;
-		}
-
-		if (instp_mode != dev_priv->relative_constants_mode) {
-			if (instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
-				DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
-				return -EINVAL;
-			}
-
-			/* The HW changed the meaning on this bit on gen6 */
-			instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
-		}
-		break;
-	default:
-		DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
-		return -EINVAL;
-	}
-
-	if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
-		DRM_DEBUG("sol reset is gen7 only\n");
-		return -EINVAL;
-	}
-
-	ret = execlists_move_to_gpu(params->request, vmas);
-	if (ret)
-		return ret;
-
-	if (engine->id == RCS &&
-	    instp_mode != dev_priv->relative_constants_mode) {
-		ret = intel_ring_begin(params->request, 4);
-		if (ret)
-			return ret;
-
-		intel_ring_emit(ring, MI_NOOP);
-		intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-		intel_ring_emit_reg(ring, INSTPM);
-		intel_ring_emit(ring, instp_mask << 16 | instp_mode);
-		intel_ring_advance(ring);
-
-		dev_priv->relative_constants_mode = instp_mode;
-	}
-
-	exec_start = params->batch_obj_vm_offset +
-		     args->batch_start_offset;
-
-	ret = engine->emit_bb_start(params->request,
-				    exec_start, args->batch_len,
-				    params->dispatch_flags);
-	if (ret)
-		return ret;
-
-	trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);
-
-	i915_gem_execbuffer_move_to_active(vmas, params->request);
-
-	return 0;
-}
-
 void intel_execlists_cancel_requests(struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *req, *tmp;

drivers/gpu/drm/i915/intel_lrc.h

@@ -97,11 +97,6 @@ int intel_sanitize_enable_execlists(struct drm_i915_private *dev_priv,
 				    int enable_execlists);
 void intel_execlists_enable_submission(struct drm_i915_private *dev_priv);
 
-struct i915_execbuffer_params;
-int intel_execlists_submission(struct i915_execbuffer_params *params,
-			       struct drm_i915_gem_execbuffer2 *args,
-			       struct list_head *vmas);
-
 void intel_execlists_cancel_requests(struct intel_engine_cs *engine);
 
 #endif /* _INTEL_LRC_H_ */