[Intel-gfx] [PATCH v4 14/14] drm/i915: Add deadline based boost support

[Rob Clark]

From: Rob Clark <robdclark at chromium.org>

Signed-off-by: Rob Clark <robdclark at chromium.org>
---

This should probably be re-written by someone who knows the i915
request/timeline stuff better, to deal with non-immediate deadlines.
But as-is I think this should be enough to handle the case where
we want syncobj waits to trigger boost.

 drivers/gpu/drm/i915/i915_driver.c  |  2 +-
 drivers/gpu/drm/i915/i915_request.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index cf1c0970ecb4..bd40b7bcb38a 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -1781,7 +1781,7 @@ static const struct drm_driver i915_drm_driver = {
 	.driver_features =
 	    DRIVER_GEM |
 	    DRIVER_RENDER | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_SYNCOBJ |
-	    DRIVER_SYNCOBJ_TIMELINE,
+	    DRIVER_SYNCOBJ_TIMELINE | DRIVER_SYNCOBJ_DEADLINE,
 	.release = i915_driver_release,
 	.open = i915_driver_open,
 	.lastclose = i915_driver_lastclose,
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 7503dcb9043b..44491e7e214c 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -97,6 +97,25 @@ static bool i915_fence_enable_signaling(struct dma_fence *fence)
 	return i915_request_enable_breadcrumb(to_request(fence));
 }
 
+static void i915_fence_set_deadline(struct dma_fence *fence, ktime_t deadline)
+{
+	struct i915_request *rq = to_request(fence);
+
+	if (i915_request_completed(rq))
+		return;
+
+	if (i915_request_started(rq))
+		return;
+
+	/*
+	 * TODO something more clever for deadlines that are in the
+	 * future.  I think probably track the nearest deadline in
+	 * rq->timeline and set timer to trigger boost accordingly?
+	 */
+
+	intel_rps_boost(rq);
+}
+
 static signed long i915_fence_wait(struct dma_fence *fence,
 				   bool interruptible,
 				   signed long timeout)
@@ -182,6 +201,7 @@ const struct dma_fence_ops i915_fence_ops = {
 	.signaled = i915_fence_signaled,
 	.wait = i915_fence_wait,
 	.release = i915_fence_release,
+	.set_deadline = i915_fence_set_deadline,
 };
 
 static void irq_execute_cb(struct irq_work *wrk)
-- 
2.39.1