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Date: Sat, 2 Feb 2008 14:49:09 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Pavel Machek <pavel@....cz>
Cc: kernel list <linux-kernel@...r.kernel.org>,
Linux-pm mailing list <linux-pm@...ts.osdl.org>
Subject: Re: sleepy linux self-test
* Pavel Machek <pavel@....cz> wrote:
> > could you send me a clean patch against mainline please? The above
> > chunk didnt apply because there's no ksleepyd (only test_sleep()).
> > Thanks,
>
> Ok, here's full patch. Good luck,
thanks. Find below it rebased against latest -git. (there was a trivial
merge reject in power/Kconfig)
Ingo
---
drivers/rtc/rtc-cmos.c | 38 ++++++++++++++++++++++++++++++++++---
kernel/power/Kconfig | 10 +++++++--
kernel/power/Makefile | 2 -
kernel/power/sleepy.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 94 insertions(+), 6 deletions(-)
Index: linux/drivers/rtc/rtc-cmos.c
===================================================================
--- linux.orig/drivers/rtc/rtc-cmos.c
+++ linux/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 +394,35 @@ static const struct rtc_class_ops cmos_r
/*----------------------------------------------------------------*/
static struct cmos_rtc cmos_rtc;
+static struct device *pc_rtc_device;
+
+int set_alarm(int length)
+{
+ ssize_t retval;
+ unsigned long now, alarm;
+ struct rtc_wkalrm alm;
+
+ if (!pc_rtc_device)
+ return -EFAULT;
+ 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(pc_rtc_device, &alm);
+ if (retval < 0) {
+ printk("Auto sleep: can't set alarm.\n");
+ return retval;
+ }
+ printk("Auto sleep: Alarm set\n");
+ return 0;
+}
static irqreturn_t cmos_interrupt(int irq, void *p)
{
@@ -431,6 +460,8 @@ cmos_do_probe(struct device *dev, struct
if (cmos_rtc.dev)
return -EBUSY;
+ pc_rtc_device = dev;
+
if (!ports)
return -ENODEV;
@@ -546,7 +577,7 @@ 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);
@@ -561,6 +592,7 @@ static void __exit cmos_do_remove(struct
struct cmos_rtc *cmos = dev_get_drvdata(dev);
struct resource *ports;
+ pc_rtc_device = NULL;
cmos_do_shutdown();
if (is_valid_irq(cmos->irq))
Index: linux/kernel/power/Kconfig
===================================================================
--- linux.orig/kernel/power/Kconfig
+++ linux/kernel/power/Kconfig
@@ -74,14 +74,20 @@ config PM_TRACE_RTC
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 SMP
Index: linux/kernel/power/Makefile
===================================================================
--- linux.orig/kernel/power/Makefile
+++ linux/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
Index: linux/kernel/power/sleepy.c
===================================================================
--- /dev/null
+++ linux/kernel/power/sleepy.c
@@ -0,0 +1,50 @@
+/*
+ * 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 <linux/kthread.h>
+
+#include <asm/percpu.h>
+
+#include "power.h"
+
+extern int set_alarm(int length);
+
+int ksleepyd(void *data)
+{
+ msleep(5000);
+ while (1) {
+ if (set_alarm(5))
+ return -EFAULT;
+ pm_suspend(PM_SUSPEND_MEM);
+ msleep(500000);
+ }
+}
+
+#ifdef CONFIG_PM_SLEEPY_TEST
+static int
+test_sleep(void)
+{
+ wake_up_process(kthread_create(ksleepyd, NULL, "ksleepyd"));
+ return 0;
+}
+
+late_initcall(test_sleep);
+#endif
--
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