ETNA_NR_EVENTS
int event = find_first_zero_bit(gpu->event_bitmap, ETNA_NR_EVENTS);
for_each_set_bit(i, gpu->event_bitmap, ETNA_NR_EVENTS)
bitmap_zero(gpu->event_bitmap, ETNA_NR_EVENTS);
DECLARE_BITMAP(event_bitmap, ETNA_NR_EVENTS);
struct etnaviv_event event[ETNA_NR_EVENTS];