R_LENGTH
val = reg_encode(reg, R_LENGTH, ring->count * GSI_RING_ELEMENT_SIZE);
[R_LENGTH] = GENMASK(15, 0),
[R_LENGTH] = GENMASK(15, 0),
[R_LENGTH] = GENMASK(15, 0),
[R_LENGTH] = GENMASK(19, 0),
[R_LENGTH] = GENMASK(15, 0),
[R_LENGTH] = GENMASK(15, 0),
[R_LENGTH] = GENMASK(23, 0),