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Message-Id: <200902221838.51548.rjw@sisk.pl>
Date: Sun, 22 Feb 2009 18:38:50 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Jeremy Fitzhardinge <jeremy@...p.org>,
pm list <linux-pm@...ts.linux-foundation.org>,
Len Brown <lenb@...nel.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC][PATCH 1/2] PM: Split up sysdev_[suspend|resume] from device_power_[down|up]
From: Rafael J. Wysocki <rjw@...k.pl>
Move the sysdev_suspend/resume from the callee to the callers, with
no real change in semantics, so that we can rework the disabling of
interrupts during suspend/hibernation.
This is based on an earlier patch from Linus.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
arch/x86/kernel/apm_32.c | 4 ++++
drivers/base/base.h | 2 --
drivers/base/power/main.c | 3 ---
drivers/xen/manage.c | 8 ++++++++
include/linux/pm.h | 2 ++
kernel/kexec.c | 7 +++++++
kernel/power/disk.c | 11 +++++++++++
kernel/power/main.c | 8 ++++++--
8 files changed, 38 insertions(+), 7 deletions(-)
Index: linux-2.6/arch/x86/kernel/apm_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apm_32.c
+++ linux-2.6/arch/x86/kernel/apm_32.c
@@ -1192,6 +1192,7 @@ static int suspend(int vetoable)
device_suspend(PMSG_SUSPEND);
local_irq_disable();
device_power_down(PMSG_SUSPEND);
+ sysdev_suspend(PMSG_SUSPEND);
local_irq_enable();
@@ -1208,6 +1209,7 @@ static int suspend(int vetoable)
if (err != APM_SUCCESS)
apm_error("suspend", err);
err = (err == APM_SUCCESS) ? 0 : -EIO;
+ sysdev_resume();
device_power_up(PMSG_RESUME);
local_irq_enable();
device_resume(PMSG_RESUME);
@@ -1228,6 +1230,7 @@ static void standby(void)
local_irq_disable();
device_power_down(PMSG_SUSPEND);
+ sysdev_suspend(PMSG_SUSPEND);
local_irq_enable();
err = set_system_power_state(APM_STATE_STANDBY);
@@ -1235,6 +1238,7 @@ static void standby(void)
apm_error("standby", err);
local_irq_disable();
+ sysdev_resume();
device_power_up(PMSG_RESUME);
local_irq_enable();
}
Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ linux-2.6/drivers/base/power/main.c
@@ -333,7 +333,6 @@ static void dpm_power_up(pm_message_t st
*/
void device_power_up(pm_message_t state)
{
- sysdev_resume();
dpm_power_up(state);
}
EXPORT_SYMBOL_GPL(device_power_up);
@@ -577,8 +576,6 @@ int device_power_down(pm_message_t state
}
dev->power.status = DPM_OFF_IRQ;
}
- if (!error)
- error = sysdev_suspend(state);
if (error)
dpm_power_up(resume_event(state));
return error;
Index: linux-2.6/drivers/xen/manage.c
===================================================================
--- linux-2.6.orig/drivers/xen/manage.c
+++ linux-2.6/drivers/xen/manage.c
@@ -45,6 +45,13 @@ static int xen_suspend(void *data)
err);
return err;
}
+ err = sysdev_suspend(PMSG_SUSPEND);
+ if (err) {
+ printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
+ err);
+ device_power_up(PMSG_RESUME);
+ return err;
+ }
xen_mm_pin_all();
gnttab_suspend();
@@ -61,6 +68,7 @@ static int xen_suspend(void *data)
gnttab_resume();
xen_mm_unpin_all();
+ sysdev_resume();
device_power_up(PMSG_RESUME);
if (!*cancelled) {
Index: linux-2.6/kernel/kexec.c
===================================================================
--- linux-2.6.orig/kernel/kexec.c
+++ linux-2.6/kernel/kexec.c
@@ -1465,6 +1465,11 @@ int kernel_kexec(void)
error = device_power_down(PMSG_FREEZE);
if (error)
goto Enable_irqs;
+
+ /* Suspend system devices */
+ error = sysdev_suspend(PMSG_FREEZE);
+ if (error)
+ goto Power_up_devices;
} else
#endif
{
@@ -1477,6 +1482,8 @@ int kernel_kexec(void)
#ifdef CONFIG_KEXEC_JUMP
if (kexec_image->preserve_context) {
+ sysdev_resume();
+ Power_up_devices:
device_power_up(PMSG_RESTORE);
Enable_irqs:
local_irq_enable();
Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -227,6 +227,12 @@ static int create_image(int platform_mod
"aborting hibernation\n");
goto Enable_irqs;
}
+ sysdev_suspend(PMSG_FREEZE);
+ if (error) {
+ printk(KERN_ERR "PM: Some devices failed to power down, "
+ "aborting hibernation\n");
+ goto Power_up_devices;
+ }
if (hibernation_test(TEST_CORE))
goto Power_up;
@@ -242,9 +248,11 @@ static int create_image(int platform_mod
if (!in_suspend)
platform_leave(platform_mode);
Power_up:
+ sysdev_resume();
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
+ Power_up_devices:
device_power_up(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
Enable_irqs:
@@ -335,6 +343,7 @@ static int resume_target_kernel(void)
"aborting resume\n");
goto Enable_irqs;
}
+ sysdev_suspend(PMSG_QUIESCE);
/* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
@@ -357,6 +366,7 @@ static int resume_target_kernel(void)
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
+ sysdev_resume();
device_power_up(PMSG_RECOVER);
Enable_irqs:
local_irq_enable();
@@ -440,6 +450,7 @@ int hibernation_platform_enter(void)
local_irq_disable();
error = device_power_down(PMSG_HIBERNATE);
if (!error) {
+ sysdev_suspend(PMSG_HIBERNATE);
hibernation_ops->enter();
/* We should never get here */
while (1);
Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/kernel/power/main.c
@@ -298,8 +298,12 @@ static int suspend_enter(suspend_state_t
goto Done;
}
- if (!suspend_test(TEST_CORE))
- error = suspend_ops->enter(state);
+ error = sysdev_suspend(PMSG_SUSPEND);
+ if (!error) {
+ if (!suspend_test(TEST_CORE))
+ error = suspend_ops->enter(state);
+ sysdev_resume();
+ }
device_power_up(PMSG_RESUME);
Done:
Index: linux-2.6/drivers/base/base.h
===================================================================
--- linux-2.6.orig/drivers/base/base.h
+++ linux-2.6/drivers/base/base.h
@@ -88,8 +88,6 @@ extern void driver_detach(struct device_
extern int driver_probe_device(struct device_driver *drv, struct device *dev);
extern void sysdev_shutdown(void);
-extern int sysdev_suspend(pm_message_t state);
-extern int sysdev_resume(void);
extern char *make_class_name(const char *name, struct kobject *kobj);
Index: linux-2.6/include/linux/pm.h
===================================================================
--- linux-2.6.orig/include/linux/pm.h
+++ linux-2.6/include/linux/pm.h
@@ -381,10 +381,12 @@ struct dev_pm_info {
#ifdef CONFIG_PM_SLEEP
extern void device_pm_lock(void);
+extern int sysdev_resume(void);
extern void device_power_up(pm_message_t state);
extern void device_resume(pm_message_t state);
extern void device_pm_unlock(void);
+extern int sysdev_suspend(pm_message_t state);
extern int device_power_down(pm_message_t state);
extern int device_suspend(pm_message_t state);
extern int device_prepare_suspend(pm_message_t state);
--
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