drm/sched: Create wrapper to add a syncobj dependency to job

In order to add a syncobj's fence as a dependency to a job, it is
necessary to call drm_syncobj_find_fence() to find the fence and then
add the dependency with drm_sched_job_add_dependency(). So, wrap these
steps in one single function, drm_sched_job_add_syncobj_dependency().
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230209124447.467867-2-mcanal@igalia.com

drivers/gpu/drm/scheduler/sched_main.c

@@ -53,6 +53,7 @@
 
 #include <drm/drm_print.h>
 #include <drm/drm_gem.h>
+#include <drm/drm_syncobj.h>
 #include <drm/gpu_scheduler.h>
 #include <drm/spsc_queue.h>
 
@@ -718,6 +719,34 @@ int drm_sched_job_add_dependency(struct drm_sched_job *job,
 }
 EXPORT_SYMBOL(drm_sched_job_add_dependency);
 
+/**
+ * drm_sched_job_add_syncobj_dependency - adds a syncobj's fence as a job dependency
+ * @job: scheduler job to add the dependencies to
+ * @file_private: drm file private pointer
+ * @handle: syncobj handle to lookup
+ * @point: timeline point
+ *
+ * This adds the fence matching the given syncobj to @job.
+ *
+ * Returns:
+ * 0 on success, or an error on failing to expand the array.
+ */
+int drm_sched_job_add_syncobj_dependency(struct drm_sched_job *job,
+					 struct drm_file *file,
+					 u32 handle,
+					 u32 point)
+{
+	struct dma_fence *fence;
+	int ret;
+
+	ret = drm_syncobj_find_fence(file, handle, point, 0, &fence);
+	if (ret)
+		return ret;
+
+	return drm_sched_job_add_dependency(job, fence);
+}
+EXPORT_SYMBOL(drm_sched_job_add_syncobj_dependency);
+
 /**
  * drm_sched_job_add_resv_dependencies - add all fences from the resv to the job
  * @job: scheduler job to add the dependencies to

include/drm/gpu_scheduler.h

@@ -48,6 +48,8 @@ struct drm_gem_object;
 struct drm_gpu_scheduler;
 struct drm_sched_rq;
 
+struct drm_file;
+
 /* These are often used as an (initial) index
  * to an array, and as such should start at 0.
  */
@@ -515,6 +517,10 @@ int drm_sched_job_init(struct drm_sched_job *job,
 void drm_sched_job_arm(struct drm_sched_job *job);
 int drm_sched_job_add_dependency(struct drm_sched_job *job,
 				 struct dma_fence *fence);
+int drm_sched_job_add_syncobj_dependency(struct drm_sched_job *job,
+					 struct drm_file *file,
+					 u32 handle,
+					 u32 point);
 int drm_sched_job_add_resv_dependencies(struct drm_sched_job *job,
 					struct dma_resv *resv,
 					enum dma_resv_usage usage);