drm/v3d: add multiple syncobjs support

Using the generic extension from the previous patch, a specific multisync
extension enables more than one in/out binary syncobj per job submission.
Arrays of syncobjs are set in struct drm_v3d_multisync, that also cares
of determining the stage for sync (wait deps) according to the job
queue.

v2:
- subclass the generic extension struct (Daniel)
- simplify adding dependency conditions to make understandable (Iago)

v3:
- fix conditions to consider single or multiples in/out_syncs (Iago)
- remove irrelevant comment (Iago)

Signed-off-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ffd8b2e3dd2e0c686db441a0c0a4a0181ff85328.1633016479.git.mwen@igalia.com

drivers/gpu/drm/v3d/v3d_drv.c

@@ -96,6 +96,9 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
 	case DRM_V3D_PARAM_SUPPORTS_PERFMON:
 		args->value = (v3d->ver >= 40);
 		return 0;
+	case DRM_V3D_PARAM_SUPPORTS_MULTISYNC_EXT:
+		args->value = 1;
+		return 0;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", args->param);
 		return -EINVAL;
@@ -135,9 +138,8 @@ v3d_postclose(struct drm_device *dev, struct drm_file *file)
 	struct v3d_file_priv *v3d_priv = file->driver_priv;
 	enum v3d_queue q;
 
-	for (q = 0; q < V3D_MAX_QUEUES; q++) {
+	for (q = 0; q < V3D_MAX_QUEUES; q++)
 		drm_sched_entity_destroy(&v3d_priv->sched_entity[q]);
-	}
 
 	v3d_perfmon_close_file(v3d_priv);
 	kfree(v3d_priv);

drivers/gpu/drm/v3d/v3d_drv.h

@@ -19,15 +19,6 @@ struct reset_control;
 
 #define GMP_GRANULARITY (128 * 1024)
 
-/* Enum for each of the V3D queues. */
-enum v3d_queue {
-	V3D_BIN,
-	V3D_RENDER,
-	V3D_TFU,
-	V3D_CSD,
-	V3D_CACHE_CLEAN,
-};
-
 #define V3D_MAX_QUEUES (V3D_CACHE_CLEAN + 1)
 
 struct v3d_queue_state {
@@ -294,6 +285,21 @@ struct v3d_csd_job {
 	struct drm_v3d_submit_csd args;
 };
 
+struct v3d_submit_outsync {
+	struct drm_syncobj *syncobj;
+};
+
+struct v3d_submit_ext {
+	u32 flags;
+	u32 wait_stage;
+
+	u32 in_sync_count;
+	u64 in_syncs;
+
+	u32 out_sync_count;
+	struct v3d_submit_outsync *out_syncs;
+};
+
 /**
  * __wait_for - magic wait macro
  *