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ahci: Check if bus is cache-coherent
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Authored by manu on May 2 2019, 4:29 PM.
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Details

Summary

We do this for FDT systems but not for ACPI ones.
Check the presence of the _CCA attribute.

Sponsored by: Ampere Computing, LLC

Test Plan

Tested on Ampere eMAG, ~x2 for read speed ~x1.7 for writes.
Tested also on my SoftIron Overdrive 1000, it now give the same perf as when I boot it with FDT

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rS FreeBSD src repository - subversion
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