[Intel-gfx] [PATCH 24/39] drm/i915: Added immediate submission override to scheduler

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

To aid with debugging issues related to the scheduler, it can be useful to
ensure that all batch buffers are submitted immediately rather than queued until
later. This change adds an override flag via the module parameter to force
instant submission.

Change-Id: I7652df53e2d3c3d77d78bebcf99856e2c53f2801
For: VIZ-1587
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/i915_scheduler.c | 7 +++++--
 drivers/gpu/drm/i915/i915_scheduler.h | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index f51676b..d4d2466 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -235,8 +235,11 @@ int i915_scheduler_queue_execbuffer(struct i915_scheduler_queue_entry *qe)
 
 	list_add_tail(&node->link, &scheduler->node_queue[ring->id]);
 
-	not_flying = i915_scheduler_count_flying(scheduler, ring) <
-						 scheduler->min_flying;
+	if (i915.scheduler_override & i915_so_submit_on_queue)
+		not_flying = true;
+	else
+		not_flying = i915_scheduler_count_flying(scheduler, ring) <
+							 scheduler->min_flying;
 
 	spin_unlock_irqrestore(&scheduler->lock, flags);
 
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 7e85f80..fc58d49 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -86,6 +86,7 @@ enum {
 /* Options for 'scheduler_override' module parameter: */
 enum {
 	i915_so_direct_submit       = (1 << 0),
+	i915_so_submit_on_queue     = (1 << 1),
 };
 
 bool        i915_scheduler_is_enabled(struct drm_device *dev);
-- 
1.9.1