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Unfortunately, it looks like the SMMU integration in the NXP LS1088A has wrongly tied the cfg_cttw signal to 0, even though the SoC documentation specifies that "The SMMU supports cache coherency for page table walks and DVM transactions for page table cache maintenance operations." Device tree provides the option of overriding the ID register via the dma-coherent property since commit bae2c2d421cd ("iommu/arm-smmu: Sort out coherency"), and that's what we do here. Telling struct io_pgtable_cfg that the SMMU page table walks are coherent with the CPU caches brings performance benefits, because it avoids certain operations such as __arm_lpae_sync_pte() for PTE updates. Link: https://lore.kernel.org/linux-iommu/3f3112e4-65ff-105d-8cd7-60495ec9054a@arm.com/ Suggested-by: Robin Murphy Signed-off-by: Vladimir Oltean --- v1->v2: patch is new arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi index 260d045dbd9a..e5fb137ac02b 100644 --- a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi +++ b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi @@ -674,6 +674,7 @@ smmu: iommu@5000000 { reg = <0 0x5000000 0 0x800000>; #iommu-cells = <1>; stream-match-mask = <0x7C00>; + dma-coherent; #global-interrupts = <12>; // global secure fault interrupts = ,