Conrad Meyer
e054cac74a
Implement ACPI CPU support when Processor object is not present
...
By the ACPI standard (ACPI 5 chapter 8.4 Declaring Processors) Processors
can be implemented in 2 distinct ways:
* Through a Processor object type (which provides P_BLK)
* Through a Device object type
Prior to this change, the FreeBSD driver only supported the former. AMD
Epyc / Poweredge systems we are testing both implement the latter only. Add
the missing support.
Because P_BLK is not defined in the device object case, C-states entering
must be completely controlled via _CST methods rather than P_LVL2/3.
John Baldwin points out that ACPI 6.0 formally deprecates the Processor
keyword, so eventually processors will only be enumerated as Device objects.
Submitted by: attilio
Reviewed by: jhb, markj, Anton Rang <rang AT acm.org>
Relnotes: maybe
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D13457
2017-12-19 02:49:11 +00:00
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