[PATCH 12/18] drm/i915: Drive request submission through fence callbacks

[Chris Wilson <chris@chris-wilson.co.uk>]

Drive final request submission from a callback from the fence. This way
the request is queued until all dependencies are resolved, at which
point it is handed to the backend for queueing to hardware. At this
point, no dependencies are set on the request, so the callback is
immediate.

A side-effect of imposing a heavier-irqsafe spinlock for execlist
submission is that we lose the softirq enabling after scheduling the
execlists tasklet. To compensate, we manually kickstart the softirq by
disabling and enabling the bh around the fence signaling.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c            |  3 +++
 drivers/gpu/drm/i915/i915_gem_request.c    | 26 +++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_gem_request.h    |  3 +++
 drivers/gpu/drm/i915/i915_guc_submission.c |  3 ++-
 drivers/gpu/drm/i915/intel_breadcrumbs.c   |  3 +++
 drivers/gpu/drm/i915/intel_lrc.c           |  5 +++--
 6 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e5a5a7695cf2..4f5d12e93682 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2548,6 +2548,9 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
 		if (i915_gem_request_completed(request))
 			continue;
 
+		if (!i915_sw_fence_done(&request->submit))
+			break;
+
 		return request;
 	}
 
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index f31246cf4f6e..89ed66275d95 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -316,6 +316,25 @@ static int i915_gem_get_seqno(struct drm_i915_private *dev_priv, u32 *seqno)
 	return 0;
 }
 
+static int __i915_sw_fence_call
+submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+{
+	struct drm_i915_gem_request *request =
+		container_of(fence, typeof(*request), submit);
+
+	switch (state) {
+	case FENCE_COMPLETE:
+		request->engine->submit_request(request);
+		break;
+
+	case FENCE_FREE:
+		i915_gem_request_put(request);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
 /**
  * i915_gem_request_alloc - allocate a request structure
  *
@@ -413,6 +432,8 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
 	 */
 	req->reserved_space = MIN_SPACE_FOR_ADD_REQUEST;
 
+	i915_sw_fence_init(&i915_gem_request_get(req)->submit, submit_notify);
+
 	if (i915.enable_execlists)
 		ret = intel_logical_ring_alloc_request_extras(req);
 	else
@@ -528,7 +549,10 @@ void __i915_add_request(struct drm_i915_gem_request *request, bool flush_caches)
 		  reserved_tail, ret);
 
 	i915_gem_mark_busy(engine);
-	engine->submit_request(request);
+
+	local_bh_disable();
+	i915_sw_fence_commit(&request->submit);
+	local_bh_enable(); /* Kick the execlists tasklet if just scheduled */
 }
 
 static unsigned long local_clock_us(unsigned int *cpu)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index 49c3c006ec17..50eac3174e63 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -28,6 +28,7 @@
 #include <linux/fence.h>
 
 #include "i915_gem.h"
+#include "i915_sw_fence.h"
 
 struct intel_wait {
 	struct rb_node node;
@@ -82,6 +83,8 @@ struct drm_i915_gem_request {
 	struct intel_ring *ring;
 	struct intel_signal_node signaling;
 
+	struct i915_sw_fence submit;
+
 	/** GEM sequence number associated with the previous request,
 	 * when the HWS breadcrumb is equal to this the GPU is processing
 	 * this request.
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index e51fce8c11ca..2332f9c98bdd 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -1020,7 +1020,8 @@ int i915_guc_submission_enable(struct drm_i915_private *dev_priv)
 
 		/* Replay the current set of previously submitted requests */
 		list_for_each_entry(request, &engine->request_list, link)
-			i915_guc_submit(request);
+			if (i915_sw_fence_done(&request->submit))
+				i915_guc_submit(request);
 	}
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 2491e4c1eaf0..9bad14d22c95 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -462,7 +462,10 @@ static int intel_breadcrumbs_signaler(void *arg)
 			 */
 			intel_engine_remove_wait(engine,
 						 &request->signaling.wait);
+
+			local_bh_disable();
 			fence_signal(&request->fence);
+			local_bh_enable(); /* kick start the tasklets */
 
 			/* Find the next oldest signal. Note that as we have
 			 * not been holding the lock, another client may
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index e2e70ecd077f..c23b151d662f 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -590,14 +590,15 @@ static void intel_lrc_irq_handler(unsigned long data)
 static void execlists_submit_request(struct drm_i915_gem_request *request)
 {
 	struct intel_engine_cs *engine = request->engine;
+	unsigned long flags;
 
-	spin_lock_bh(&engine->execlist_lock);
+	spin_lock_irqsave(&engine->execlist_lock, flags);
 
 	list_add_tail(&request->execlist_link, &engine->execlist_queue);
 	if (execlists_elsp_idle(engine))
 		tasklet_hi_schedule(&engine->irq_tasklet);
 
-	spin_unlock_bh(&engine->execlist_lock);
+	spin_unlock_irqrestore(&engine->execlist_lock, flags);
 }
 
 int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
-- 
2.9.3

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