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Date: Mon, 21 Jan 2008 01:31:06 +0100
From: Pavel Machek <pavel@....cz>
To: Ingo Molnar <mingo@...e.hu>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Rafael J. Wysocki" <rjw@...k.pl>, Zan Lynx <zlynx@....org>,
Thomas Gleixner <tglx@...utronix.de>,
Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: echo mem > /sys/power/state
On Mon 2008-01-21 00:42:08, Ingo Molnar wrote:
>
> * Pavel Machek <pavel@....cz> wrote:
>
> > Hi!
> >
> > Ingo wanted simple sleep self-test... Here's something.
>
> thanks :)
>
> threw it into auto-qa, and it got thrown back with:
Ok... it needs to depend on cmos_rtc... Plus timeout needs to be
longer, because if it fails to suspend within timeout, it will hang.
I actually tested this version... and it has some problems with
nohz. I have to press shift (probably any key will do) to make it
suspend :-(.
How big is your autotest farm, btw?
Pavel
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 29cf145..d830ed2 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -78,7 +78,7 @@ static inline int is_intr(u8 rtc_intr)
/*----------------------------------------------------------------*/
-static int cmos_read_time(struct device *dev, struct rtc_time *t)
+int cmos_read_time(struct device *dev, struct rtc_time *t)
{
/* REVISIT: if the clock has a "century" register, use
* that instead of the heuristic in get_rtc_time().
@@ -170,7 +170,7 @@ static int cmos_read_alarm(struct device
return 0;
}
-static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char mon, mday, hrs, min, sec;
@@ -394,6 +394,7 @@ static const struct rtc_class_ops cmos_r
/*----------------------------------------------------------------*/
static struct cmos_rtc cmos_rtc;
+struct device *pc_rtc_device;
static irqreturn_t cmos_interrupt(int irq, void *p)
{
@@ -431,6 +432,8 @@ cmos_do_probe(struct device *dev, struct
if (cmos_rtc.dev)
return -EBUSY;
+ pc_rtc_device = dev;
+
if (!ports)
return -ENODEV;
@@ -546,7 +549,7 @@ cleanup0:
static void cmos_do_shutdown(void)
{
- unsigned char rtc_control;
+ unsigned char rtc_control;
spin_lock_irq(&rtc_lock);
rtc_control = CMOS_READ(RTC_CONTROL);
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 8e186c6..b719fd3 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -53,14 +53,20 @@ config PM_TRACE
RTC across reboots, so that you can debug a machine that just hangs
during suspend (or more commonly, during resume).
- To use this debugging feature you should attempt to suspend the machine,
- then reboot it, then run
+ To use this debugging feature you should attempt to suspend the
+ machine, then reboot it, then run
dmesg -s 1000000 | grep 'hash matches'
CAUTION: this option will cause your machine's real-time clock to be
set to an invalid time after a resume.
+config PM_SLEEPY_TEST
+ bool "Test suspend/resume during bootup"
+ depends on PM_DEBUG && PM_SLEEP && RTC_DRV_CMOS
+ ---help---
+ This option will suspend/resume your machine during bootup.
+
config PM_SLEEP_SMP
bool
depends on SUSPEND_SMP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index f7dfff2..e5693d6 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -5,7 +5,7 @@ endif
obj-y := main.o
obj-$(CONFIG_PM_LEGACY) += pm.o
-obj-$(CONFIG_PM_SLEEP) += process.o console.o
+obj-$(CONFIG_PM_SLEEP) += process.o console.o sleepy.o
obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
diff --git a/kernel/power/sleepy.c b/kernel/power/sleepy.c
new file mode 100644
index 0000000..a437054
--- /dev/null
+++ b/kernel/power/sleepy.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2007 Pavel Machek <pavel@...e.cz>
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/cpu.h>
+#include <linux/resume-trace.h>
+#include <linux/freezer.h>
+#include <linux/vmstat.h>
+#include <linux/syscalls.h>
+#include <linux/rtc.h>
+
+#include <asm/percpu.h>
+
+#include "power.h"
+
+extern int set_alarm(int length);
+
+extern struct device *pc_rtc_device;
+extern int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t);
+extern int cmos_read_time(struct device *dev, struct rtc_time *t);
+
+int set_alarm(int length)
+{
+ ssize_t retval;
+ unsigned long now, alarm;
+ struct rtc_wkalrm alm;
+ struct rtc_device *rtc = to_rtc_device(pc_rtc_device);
+
+ retval = cmos_read_time(pc_rtc_device, &alm.time);
+ if (retval < 0) {
+ printk("Auto sleep: can't get time?\n");
+ return retval;
+ }
+ rtc_tm_to_time(&alm.time, &now);
+ printk("Auto sleep: Now %ld\n", now);
+
+ alarm = now+length;
+ rtc_time_to_tm(alarm, &alm.time);
+
+ retval = cmos_set_alarm(rtc, &alm);
+ if (retval < 0) {
+ printk("Auto sleep: can't set alarm.\n");
+ return retval;
+ }
+ printk("Auto sleep: Alarm set\n");
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEPY_TEST
+static int
+test_sleep(void)
+{
+ set_alarm(5);
+ pm_suspend(PM_SUSPEND_MEM);
+ return 0;
+}
+
+late_initcall(test_sleep);
+#endif
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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