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Subject[PATCH v2 2/5] PM / suspend: add function to disable secondaries for suspend
Date
This adds a function to disable secondary CPUs for suspend that are
not necessarily non-zero / non-boot CPUs. Platforms will be able to
use this to suspend using non-zero CPUs.

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
include/linux/cpu.h | 10 ++++++++++
kernel/kexec_core.c | 4 ++--
kernel/power/hibernate.c | 12 ++++++------
kernel/power/suspend.c | 4 ++--
4 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 5041357d0297..563e697e7779 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -137,6 +137,16 @@ static inline int disable_nonboot_cpus(void)
return freeze_secondary_cpus(0);
}
extern void enable_nonboot_cpus(void);
+
+static inline int suspend_disable_secondary_cpus(void)
+{
+ return freeze_secondary_cpus(0);
+}
+static inline void suspend_enable_secondary_cpus(void)
+{
+ return enable_nonboot_cpus();
+}
+
#else /* !CONFIG_PM_SLEEP_SMP */
static inline int disable_nonboot_cpus(void) { return 0; }
static inline void enable_nonboot_cpus(void) {}
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index d7140447be75..fd5c95ff9251 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -1150,7 +1150,7 @@ int kernel_kexec(void)
error = dpm_suspend_end(PMSG_FREEZE);
if (error)
goto Resume_devices;
- error = disable_nonboot_cpus();
+ error = suspend_disable_secondary_cpus();
if (error)
goto Enable_cpus;
local_irq_disable();
@@ -1183,7 +1183,7 @@ int kernel_kexec(void)
Enable_irqs:
local_irq_enable();
Enable_cpus:
- enable_nonboot_cpus();
+ suspend_enable_secondary_cpus();
dpm_resume_start(PMSG_RESTORE);
Resume_devices:
dpm_resume_end(PMSG_RESTORE);
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index abef759de7c8..cfc7a57049e4 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -281,7 +281,7 @@ static int create_image(int platform_mode)
if (error || hibernation_test(TEST_PLATFORM))
goto Platform_finish;

- error = disable_nonboot_cpus();
+ error = suspend_disable_secondary_cpus();
if (error || hibernation_test(TEST_CPUS))
goto Enable_cpus;

@@ -323,7 +323,7 @@ static int create_image(int platform_mode)
local_irq_enable();

Enable_cpus:
- enable_nonboot_cpus();
+ suspend_enable_secondary_cpus();

Platform_finish:
platform_finish(platform_mode);
@@ -417,7 +417,7 @@ int hibernation_snapshot(int platform_mode)

int __weak hibernate_resume_nonboot_cpu_disable(void)
{
- return disable_nonboot_cpus();
+ return suspend_disable_secondary_cpus();
}

/**
@@ -486,7 +486,7 @@ static int resume_target_kernel(bool platform_mode)
local_irq_enable();

Enable_cpus:
- enable_nonboot_cpus();
+ suspend_enable_secondary_cpus();

Cleanup:
platform_restore_cleanup(platform_mode);
@@ -564,7 +564,7 @@ int hibernation_platform_enter(void)
if (error)
goto Platform_finish;

- error = disable_nonboot_cpus();
+ error = suspend_disable_secondary_cpus();
if (error)
goto Enable_cpus;

@@ -586,7 +586,7 @@ int hibernation_platform_enter(void)
local_irq_enable();

Enable_cpus:
- enable_nonboot_cpus();
+ suspend_enable_secondary_cpus();

Platform_finish:
hibernation_ops->finish();
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 0bd595a0b610..59b6def23046 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -428,7 +428,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
if (suspend_test(TEST_PLATFORM))
goto Platform_wake;

- error = disable_nonboot_cpus();
+ error = suspend_disable_secondary_cpus();
if (error || suspend_test(TEST_CPUS))
goto Enable_cpus;

@@ -458,7 +458,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
BUG_ON(irqs_disabled());

Enable_cpus:
- enable_nonboot_cpus();
+ suspend_enable_secondary_cpus();

Platform_wake:
platform_resume_noirq(state);
--
2.20.1
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