mmVM_L2_MEM_ECC_CNT
WREG32_SOC15(GC, 0, mmVM_L2_MEM_ECC_CNT, 0);
data = RREG32_SOC15(GC, 0, mmVM_L2_MEM_ECC_CNT);
WREG32_SOC15(GC, 0, mmVM_L2_MEM_ECC_CNT, 0);
RREG32_SOC15(GC, 0, mmVM_L2_MEM_ECC_CNT);