nvkm_list_find
for (p = nvkm_list_find(p, (h), m, (c)); p; p = nvkm_list_find_next(p, (h), m, (c)))
vctx = nvkm_list_find(vctx, &cgrp->vctxs, head,
ectx = nvkm_list_find(ectx, &cgrp->ectxs, head, ectx->engn == engn);
cctx = nvkm_list_find(cctx, &chan->cctxs, head,
#define nvkm_runl_find_engn(engn,runl,cond) nvkm_list_find(engn, &(runl)->engns, head, (cond))