Should the hpm counter still count when a fault is checked?

[wangyongzhen0322]

For example, if a fault occurs while locating the DC, whether the register that counts the Walks in the Device Directory should be counted. If the IOMMU receives an ATS Translation request when ddtp.iommu_mode==Bare, whether the register that counts ATS Translation requests should be counted.

[ved-rivos]

The performance monitoring counter that counts walks in device directory would increment by one on each read from the device directory table. When the mode is Bare, there are no reads from the device directory table and the counter will not count. A counter that counts ATS translation requests will count by one on each such request irrespective of whether the request leads to a failure. Effective, the counters count events that they are programmed to count.

[wangyongzhen0322]

I got it. Thanks for your explanation