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authorNikos Nikoleris <nikos.nikoleris@arm.com>2017-10-09 13:57:49 +0100
committerNikos Nikoleris <nikos.nikoleris@arm.com>2017-11-21 13:54:35 +0000
commitd3ec34201c14d551e864372a89ccddb1c255e77a (patch)
tree89bc694a57a35a5bdf9d4e33f5530c4dd6ee95bf /src
parent2ec997fb73eab01229909f0c91f7ff5456f7250a (diff)
downloadgem5-d3ec34201c14d551e864372a89ccddb1c255e77a.tar.xz
cpu-o3: Prevent cpu from suspending if it is already draining
Suspending the current thread context while draining due to a quiesce pseudo instruction (for example a wfi instruction) could deadlock the cpu and prevent it from successfully draining. This change ensures that the cpu is not draining before suspending the thread context. Change-Id: I7c019847f5a870d4bc9ce2b19936bc3dc45e5fd7 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5881 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Diffstat (limited to 'src')
-rwxr-xr-xsrc/cpu/o3/thread_context_impl.hh7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/cpu/o3/thread_context_impl.hh b/src/cpu/o3/thread_context_impl.hh
index fdaa35134..d9f84fb52 100755
--- a/src/cpu/o3/thread_context_impl.hh
+++ b/src/cpu/o3/thread_context_impl.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2010-2012, 2016 ARM Limited
+ * Copyright (c) 2010-2012, 2016-2017 ARM Limited
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved
*
@@ -109,6 +109,11 @@ O3ThreadContext<Impl>::suspend()
if (thread->status() == ThreadContext::Suspended)
return;
+ if (cpu->isDraining()) {
+ DPRINTF(O3CPU, "Ignoring suspend on TC due to pending drain\n");
+ return;
+ }
+
thread->lastActivate = curTick();
thread->lastSuspend = curTick();