drm/i915: Add new frontbuffer tracking interface to queue flush

We want to wait dma fences in dirtyfb ioctl. As we don't want to make
dirtyfb ioctl as blocking call we need to use
dma_fence_add_callback. Callback used for dma_fence_add_callback is
called from atomic context. Due to this we need to add a new
frontbuffer tracking interface to queue flush.

v3:
 - Check schedule work success rather than work being pending
 - Init flush work when frontbuffer struct is initialized
v2: Check if flush work is already pending

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230901093500.3463046-4-jouni.hogander@intel.com

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
index 54ddb69eca66..d5540c739404 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
@@ -203,6 +203,33 @@ void __intel_fb_flush(struct intel_frontbuffer *front,
 		frontbuffer_flush(i915, frontbuffer_bits, origin);
 }
 
+static void intel_frontbuffer_flush_work(struct work_struct *work)
+{
+	struct intel_frontbuffer *front =
+		container_of(work, struct intel_frontbuffer, flush_work);
+
+	i915_gem_object_flush_if_display(front->obj);
+	intel_frontbuffer_flush(front, ORIGIN_DIRTYFB);
+	intel_frontbuffer_put(front);
+}
+
+/**
+ * intel_frontbuffer_queue_flush - queue flushing frontbuffer object
+ * @front: GEM object to flush
+ *
+ * This function is targeted for our dirty callback for queueing flush when
+ * dma fence is signales
+ */
+void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front)
+{
+	if (!front)
+		return;
+
+	kref_get(&front->ref);
+	if (!schedule_work(&front->flush_work))
+		intel_frontbuffer_put(front);
+}
+
 static int frontbuffer_active(struct i915_active *ref)
 {
 	struct intel_frontbuffer *front =
@@ -262,6 +289,7 @@ intel_frontbuffer_get(struct drm_i915_gem_object *obj)
 			 frontbuffer_active,
 			 frontbuffer_retire,
 			 I915_ACTIVE_RETIRE_SLEEPS);
+	INIT_WORK(&front->flush_work, intel_frontbuffer_flush_work);
 
 	spin_lock(&i915->display.fb_tracking.lock);
 	cur = i915_gem_object_set_frontbuffer(obj, front);