Hi, Here is v3 of arm-smmu changes to support SMMUs on Calxeda ECX-2000.
Esp. I've reworked the automatic StreamID masking. With this I try to keep the number of used SMRs as low as possible. Of course it still depends on some kind of reasonable ordering of StreamIDs for a master. The general problem to determine the least number of mask/id pairs to use for a given number of StreamIDs is not easy to solve. But I think the solution provided with patch 4 plus considering that we have some influence how the StreamIDs are ordered (eg. when provided in DT) is sufficient for kernel usage. Here an example of SMR-usage for 3 SMMUs, each with one master device and having StreamIDs 0-9, 0-1 and 0-1: arm-smmu 920180000.smmu: SMR0: 0x80070000 arm-smmu 920180000.smmu: SMR1: 0x80010008 arm-smmu 920180000.smmu: S2CR0: 0x0 arm-smmu 920180000.smmu: S2CR1: 0x0 arm-smmu 920000000.smmu: SMR0: 0x80010000 arm-smmu 920000000.smmu: S2CR0: 0x0 arm-smmu 920080000.smmu: SMR0: 0x80010000 arm-smmu 920080000.smmu: S2CR0: 0x0 Changelog: v3: - Reworked automatic StreamID masking (I think the previous posted version was buggy anyway). It repeatedly tries to determine mask/id pairs for stream matching. - Removed the patch that introduced support to mask all StreamIDs of a master device. - Removed setting of flag sCR0_USFCFG in arm_smmu_device_notifier. v2: http://marc.info/?l=linux-arm-kernel&m=138135834704855 v1: http://marc.info/?l=linux-arm-kernel&m=138122450023564 Regards, Andreas _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
