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| author | Anouk Van Laer <anouk.vanlaer@arm.com> | 2017-03-17 12:02:00 +0000 |
|---|---|---|
| committer | Andreas Sandberg <andreas.sandberg@arm.com> | 2017-11-20 11:03:03 +0000 |
| commit | c0d613adb4eca09c32aca1cc90f04c29574f69c6 (patch) | |
| tree | 1c2a0d26778d8b8ca3f0b359f990dc695156bf8f /src/cpu/minor | |
| parent | d626f4f7aaa4d2c9f7ae1afc35577fa025b4de38 (diff) | |
| download | gem5-c0d613adb4eca09c32aca1cc90f04c29574f69c6.tar.xz | |
pwr: Adds logic to enter power gating for the cpu model
If the CPU has been clock gated for a sufficient amount of time
(configurable via pwrGatingLatency), the CPU will go into the OFF
power state. This does not model hardware, just behaviour.
Change-Id: Ib3681d1ffa6ad25eba60f47b4020325f63472d43
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/3969
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Diffstat (limited to 'src/cpu/minor')
| -rw-r--r-- | src/cpu/minor/cpu.cc | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/cpu/minor/cpu.cc b/src/cpu/minor/cpu.cc index ae4fda6f6..68c07675f 100644 --- a/src/cpu/minor/cpu.cc +++ b/src/cpu/minor/cpu.cc @@ -1,5 +1,5 @@ /* - * Copyright (c) 2012-2014 ARM Limited + * Copyright (c) 2012-2014, 2017 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -195,6 +195,9 @@ MinorCPU::startup() DrainState MinorCPU::drain() { + // Deschedule any power gating event (if any) + deschedulePowerGatingEvent(); + if (switchedOut()) { DPRINTF(Drain, "Minor CPU switched out, draining not needed.\n"); return DrainState::Drained; @@ -240,10 +243,14 @@ MinorCPU::drainResume() "'timing' mode.\n"); } - for (ThreadID tid = 0; tid < numThreads; tid++) + for (ThreadID tid = 0; tid < numThreads; tid++){ wakeup(tid); + } pipeline->drainResume(); + + // Reschedule any power gating event (if any) + schedulePowerGatingEvent(); } void |