From: Chen Yu <yu.c.chen@intel.com>
To: linux-pm@vger.kernel.org, x86@kernel.org
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@suse.de>,
Pavel Machek <pavel@ucw.cz>, Brian Gerst <brgerst@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Varun Koyyalagunta <cpudebug@centtech.com>,
linux-kernel@vger.kernel.org, Chen Yu <yu.c.chen@intel.com>
Subject: [PATCH 2/4][RFC v2] PM / sleep: Introduce arch-specific hook for disable/enable nonboot cpus
Date: Sun, 26 Jun 2016 00:18:41 +0800 [thread overview]
Message-ID: <fb78859e5c1ea061ce4e35e200821ed170e6658d.1466844557.git.yu.c.chen@intel.com> (raw)
In-Reply-To: <cover.1466844557.git.yu.c.chen@intel.com>
There is requirement that we need to do some arch-specific
operations before putting the nonboot CPUs offline/online.
One of the requirements comes from the hibernation resume
process on x86_64, we need to kick all the offlin-CPUs
online and offline again, in order to put them in a safe
state, thus to avoid possible unwilling wake up during
hibernation resume.
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
kernel/cpu.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/kernel/cpu.c b/kernel/cpu.c
index d25266e..ce6e5e4 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1017,6 +1017,16 @@ EXPORT_SYMBOL_GPL(cpu_up);
#ifdef CONFIG_PM_SLEEP_SMP
static cpumask_var_t frozen_cpus;
+void __weak arch_disable_nonboot_cpus_pre(void)
+{
+
+}
+
+void __weak arch_enable_nonboot_cpus_pre(void)
+{
+
+}
+
int disable_nonboot_cpus(void)
{
int cpu, first_cpu, error = 0;
@@ -1024,6 +1034,7 @@ int disable_nonboot_cpus(void)
if (frozen_cpus == NULL)
return -ENOMEM;
cpu_maps_update_begin();
+ arch_disable_nonboot_cpus_pre();
first_cpu = cpumask_first(cpu_online_mask);
/*
* We take down all of the non-boot CPUs in one shot to avoid races
@@ -1078,6 +1089,7 @@ void enable_nonboot_cpus(void)
return;
/* Allow everyone to use the CPU hotplug again */
cpu_maps_update_begin();
+ arch_enable_nonboot_cpus_pre();
WARN_ON(--cpu_hotplug_disabled < 0);
if (cpumask_empty(frozen_cpus))
goto out;
--
2.7.4
next prev parent reply other threads:[~2016-06-25 16:11 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-25 16:18 [PATCH 0/4][RFC v2] x86, hotplug: Use hlt instead of mwait when resuming from hibernation Chen Yu
2016-06-25 16:18 ` [PATCH 1/4][RFC v2] PM / sleep: Avoid accessing frozen_cpus if it is NULL Chen Yu
2016-06-25 16:51 ` Pavel Machek
2016-06-26 1:16 ` Chen, Yu C
2016-06-26 4:25 ` Chen, Yu C
2016-06-25 16:18 ` Chen Yu [this message]
2016-06-25 16:51 ` [PATCH 2/4][RFC v2] PM / sleep: Introduce arch-specific hook for disable/enable nonboot cpus Pavel Machek
2016-06-26 1:19 ` Chen, Yu C
2016-10-07 19:31 ` Andy Lutomirski
2016-10-08 16:58 ` Chen Yu
2016-10-11 15:42 ` Pavel Machek
2016-06-25 16:18 ` [PATCH 3/4][RFC v2] PM / hibernate: introduce a flag to indicate resuming from hibernation Chen Yu
2016-06-25 16:53 ` Pavel Machek
2016-06-26 1:34 ` Chen, Yu C
2016-06-25 16:19 ` [PATCH 4/4] x86, hotplug: Use hlt instead of mwait when " Chen Yu
2016-10-07 19:47 ` Andy Lutomirski
2016-10-08 10:31 ` Rafael J. Wysocki
2016-10-16 16:50 ` Andy Lutomirski
2016-10-18 0:30 ` Rafael J. Wysocki
2016-10-18 1:21 ` Andy Lutomirski
2016-10-08 16:54 ` Chen Yu
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