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Emulated S3 with s0ix (not currently working)
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Authored by bwidawsk on Oct 23 2018, 10:20 PM.

Details

Reviewers
jhb
Summary

These were developed on github:
https://github.com/bwidawsk/freebsd/tree/s0ix

S0ix is the name of Intel's implementation of Low Power Idle states as described
in ACPI spec via LPIT, and SPMC. It can be thought of as a hardware managed
suspend state whereby all software needs to do is sufficiently idle the system,
and hardware will go into the lower power state until woken by a specified set
of events.

Newer laptops with Intel CPUs prefer a sleep state known as s0ix (where x can be
1, 2, or 3). s0ix entry and benefits are explained in the patches found on
github.

Test Plan

Test suspend to idle on a machine supporting s0ix. Use residency
counters to determine if successful.

Diff Detail

Lint
Lint OK
Unit
No Unit Test Coverage
Build Status
Buildable 20375
Build 19816: arc lint + arc unit

Event Timeline

bwidawsk created this revision.Oct 23 2018, 10:20 PM

The hunks for the idle suspend stuff were some WIP that I hadn't finished. They can be ignored.

bwidawsk updated this revision to Diff 49637.Oct 25 2018, 11:38 PM

Small fix for systems which don't have a pm device

lwhsu added a subscriber: lwhsu.Dec 4 2018, 5:03 PM
scottl added a subscriber: scottl.Jun 12 2019, 2:49 PM