From: Feng Kan Date: Wed, 11 Oct 2017 22:08:39 +0000 (-0700) Subject: iommu/arm-smmu: Enable bypass transaction caching for ARM SMMU 500 X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=74f55d34414c866dbf3a69e28a2f963abe61ca58;p=openwrt%2Fstaging%2Fblogic.git iommu/arm-smmu: Enable bypass transaction caching for ARM SMMU 500 The ARM SMMU identity mapping performance was poor compared with the DMA mode. It was found that enable caching would restore the performance back to normal. The S2CRB_TLBEN bit in the ACR register would allow for caching of the stream to context register bypass transaction information. Reviewed-by: Robin Murphy Signed-off-by: Feng Kan Signed-off-by: Will Deacon --- diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index bce312a99f52..4683f518cef4 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -59,6 +59,7 @@ #define ARM_MMU500_ACTLR_CPRE (1 << 1) #define ARM_MMU500_ACR_CACHE_LOCK (1 << 26) +#define ARM_MMU500_ACR_S2CRB_TLBEN (1 << 10) #define ARM_MMU500_ACR_SMTNMB_TLBEN (1 << 8) #define TLB_LOOP_TIMEOUT 1000000 /* 1s! */ @@ -1598,7 +1599,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu) * Allow unmatched Stream IDs to allocate bypass * TLB entries for reduced latency. */ - reg |= ARM_MMU500_ACR_SMTNMB_TLBEN; + reg |= ARM_MMU500_ACR_SMTNMB_TLBEN | ARM_MMU500_ACR_S2CRB_TLBEN; writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_sACR); }