regSDMA_PAGE_RB_WPTR_HI
wptr = RREG32_SDMA(ring->me, regSDMA_PAGE_RB_WPTR_HI);
WREG32_SDMA(ring->me, regSDMA_PAGE_RB_WPTR_HI,
SOC15_REG_ENTRY_STR(GC, 0, regSDMA_PAGE_RB_WPTR_HI),
WREG32_SDMA(i, regSDMA_PAGE_RB_WPTR_HI, upper_32_bits(rwptr << 2));
WREG32_SDMA(i, regSDMA_PAGE_RB_WPTR_HI, 0);