Skylake (i7-7980XE) IOMMU and uncore_iio_x

Skylake (i7-7980XE) IOMMU and uncore_iio_x

Hello, 

I am using i7-7980XE (skylake-x) CPU in Linux. after enabling IOMMU in Linux command line, I can see that DMAR is enabled in dmesg. 

under /sys/devices/uncore_iio_x(x = 0 to 5), there are some runtime_status info. but while I run PCIe transfer over the bus, the runtime_status always shows disabled. 

How can I check the uncore_iio are indeed enabled and running? 

Thanks.

Mei Guodong

 

 

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