drm/nouveau/core: add function to return list of supported children

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

2 files changed, 34 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/core/core/parent.c b/drivers/gpu/drm/nouveau/core/core/parent.c
index dee5d1235e9b..8701968a9743 100644
--- a/drivers/gpu/drm/nouveau/core/core/parent.c
+++ b/drivers/gpu/drm/nouveau/core/core/parent.c
@@ -75,6 +75,39 @@ nouveau_parent_sclass(struct nouveau_object *parent, u16 handle,
 }
 
 int
+nouveau_parent_lclass(struct nouveau_object *parent, u32 *lclass, int size)
+{
+	struct nouveau_sclass *sclass;
+	struct nouveau_engine *engine;
+	struct nouveau_oclass *oclass;
+	int nr = -1, i;
+	u64 mask;
+
+	sclass = nv_parent(parent)->sclass;
+	while (sclass) {
+		if (++nr < size)
+			lclass[nr] = sclass->oclass->handle;
+		sclass = sclass->sclass;
+	}
+
+	mask = nv_parent(parent)->engine;
+	while (i = __ffs64(mask), mask) {
+		engine = nouveau_engine(parent, i);
+		if (engine && (oclass = engine->sclass)) {
+			while (oclass->ofuncs) {
+				if (++nr < size)
+					lclass[nr] = oclass->handle;
+				oclass++;
+			}
+		}
+
+		mask &= ~(1ULL << i);
+	}
+
+	return nr + 1;
+}
+
+int
 nouveau_parent_create_(struct nouveau_object *parent,
 		       struct nouveau_object *engine,
 		       struct nouveau_oclass *oclass, u32 pclass,
diff --git a/drivers/gpu/drm/nouveau/core/include/core/parent.h b/drivers/gpu/drm/nouveau/core/include/core/parent.h
index 9f5ea900ff00..12da418ec70a 100644
--- a/drivers/gpu/drm/nouveau/core/include/core/parent.h
+++ b/drivers/gpu/drm/nouveau/core/include/core/parent.h
@@ -57,5 +57,6 @@ void _nouveau_parent_dtor(struct nouveau_object *);
 int nouveau_parent_sclass(struct nouveau_object *, u16 handle,
 			  struct nouveau_object **pengine,
 			  struct nouveau_oclass **poclass);
+int nouveau_parent_lclass(struct nouveau_object *, u32 *, int);
 
 #endif