iris: Make a iris_batch_reference_signal_syncpt helper function.

Suggested by Chris Wilson.  More obvious what's going on.

src/gallium/drivers/iris/iris_batch.h

@@ -33,6 +33,8 @@
 #include "i915_drm.h"
 #include "common/gen_decoder.h"
 
+#include "iris_fence.h"
+
 /* The kernel assumes batchbuffers are smaller than 256kB. */
 #define MAX_BATCH_SIZE (256 * 1024)
 
@@ -193,4 +195,20 @@ iris_batch_emit(struct iris_batch *batch, const void *data, unsigned size)
    memcpy(map, data, size);
 }
 
+/**
+ * Take a reference to the batch's signalling syncpt.
+ *
+ * Callers can use this to wait for the the current batch under construction
+ * to complete (after flushing it).
+ */
+static inline void
+iris_batch_reference_signal_syncpt(struct iris_batch *batch,
+                                   struct iris_syncpt **out_syncpt)
+{
+   /* The signalling syncpt is the first one in the list. */
+   struct iris_syncpt *syncpt =
+      ((struct iris_syncpt **) util_dynarray_begin(&batch->syncpts))[0];
+   iris_syncpt_reference(batch->screen, out_syncpt, syncpt);
+}
+
 #endif

src/gallium/drivers/iris/iris_fence.h

@@ -27,6 +27,8 @@
 #include "util/u_inlines.h"
 
 struct pipe_screen;
+struct iris_screen;
+struct iris_batch;
 
 struct iris_syncpt {
    struct pipe_reference ref;

src/gallium/drivers/iris/iris_query.c

@@ -811,13 +811,10 @@ iris_end_query(struct pipe_context *ctx, struct pipe_query *query)
    struct iris_context *ice = (void *) ctx;
    struct iris_query *q = (void *) query;
    struct iris_batch *batch = &ice->batches[q->batch_idx];
-   struct iris_screen *screen = (void *) ctx->screen;
 
    if (q->type == PIPE_QUERY_TIMESTAMP) {
       iris_begin_query(ctx, query);
-      struct iris_syncpt *syncpt =
-         ((struct iris_syncpt **) util_dynarray_begin(&batch->syncpts))[0];
-      iris_syncpt_reference(screen, &q->syncpt, syncpt);
+      iris_batch_reference_signal_syncpt(batch, &q->syncpt);
       mark_available(ice, q);
       return true;
    }
@@ -835,9 +832,7 @@ iris_end_query(struct pipe_context *ctx, struct pipe_query *query)
                   q->query_state_ref.offset +
                   offsetof(struct iris_query_snapshots, end));
 
-   struct iris_syncpt *syncpt =
-      ((struct iris_syncpt **) util_dynarray_begin(&batch->syncpts))[0];
-   iris_syncpt_reference(screen, &q->syncpt, syncpt);
+   iris_batch_reference_signal_syncpt(batch, &q->syncpt);
    mark_available(ice, q);
 
    return true;