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Message-Id: <200711012359.16428.rjw@sisk.pl>
Date: Thu, 1 Nov 2007 23:59:15 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: pm list <linux-pm@...ts.linux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
Pavel Machek <pavel@....cz>
Subject: [RFC][PATCH 2/3] Hibernation: New testing facility
From: Rafael J. Wysocki <rjw@...k.pl>
Make it possible to test the hibernation core code with the help of the
/sys/power/pm_test_level attribute introduced for suspend testing in the
previous patch.
Writing a number (1-5) to this file causes the hibernation code to work in one
of the test modes defined as follows:
5 - test the freezing of processes
4 - test the freezing of processes and suspending of devices
3 - test the freezing of processes, suspending of devices and platform global
control methods(*)
2 - test the freezing of processes, suspending of devices, platform global
control methods(*) and the disabling of nonboot CPUs
1 - test the freezing of processes, suspending of devices, platform global
control methods(*), the disabling of nonboot CPUs and suspending of
platform/system devices
(*) - the platform global control methods are only available on ACPI systems
and are only tested if the hibernation mode is set to "platform"
Then, if a hibernation is started by normal means, the hibernation core will
perform its normal operations up to the point indicated by the test level.
Next, it will wait for 5 seconds and carry out the resume operations needed to
transition the system back to the fully functional state.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
kernel/power/disk.c | 70 ++++++++++++++++++++++++++++++++++++++++-----------
kernel/power/power.h | 2 +
2 files changed, 57 insertions(+), 15 deletions(-)
Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -70,6 +70,35 @@ void hibernation_set_ops(struct platform
mutex_unlock(&pm_mutex);
}
+#ifdef CONFIG_PM_DEBUG
+static void hibernation_debug_sleep(void)
+{
+ printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+}
+
+static int hibernation_testmode(int mode)
+{
+ if (hibernation_mode == mode) {
+ hibernation_debug_sleep();
+ return 1;
+ }
+ return 0;
+}
+
+static int hibernation_test(int level)
+{
+ if (pm_test_level == level) {
+ hibernation_debug_sleep();
+ return 1;
+ }
+ return 0;
+}
+#else /* !CONFIG_PM_DEBUG */
+static int hibernation_testmode(int mode) { return 0; }
+static int hibernation_test(int level) { return 0; }
+#endif /* !CONFIG_PM_DEBUG */
+
/**
* platform_start - tell the platform driver that we're starting
* hibernation
@@ -167,6 +196,10 @@ int create_image(int platform_mode)
goto Enable_irqs;
}
+ if (hibernation_test(TEST_CORE))
+ goto Power_up;
+
+ in_suspend = 1;
save_processor_state();
error = swsusp_arch_suspend();
if (error)
@@ -175,6 +208,7 @@ int create_image(int platform_mode)
restore_processor_state();
if (!in_suspend)
platform_leave(platform_mode);
+ Power_up:
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
@@ -211,24 +245,29 @@ int hibernation_snapshot(int platform_mo
if (error)
goto Resume_console;
- error = platform_pre_snapshot(platform_mode);
- if (error)
+ if (hibernation_test(TEST_DEVICES))
goto Resume_devices;
+ error = platform_pre_snapshot(platform_mode);
+ if (error || hibernation_test(TEST_PLATFORM))
+ goto Finish;
+
error = disable_nonboot_cpus();
if (!error) {
- if (hibernation_mode != HIBERNATION_TEST) {
- in_suspend = 1;
- error = create_image(platform_mode);
- /* Control returns here after successful restore */
- } else {
- printk("swsusp debug: Waiting for 5 seconds.\n");
- mdelay(5000);
- }
+ if (hibernation_test(TEST_CPUS))
+ goto Enable_cpus;
+
+ if (hibernation_testmode(HIBERNATION_TEST))
+ goto Enable_cpus;
+
+ error = create_image(platform_mode);
+ /* Control returns here after successful restore */
}
+ Enable_cpus:
enable_nonboot_cpus();
- Resume_devices:
+ Finish:
platform_finish(platform_mode);
+ Resume_devices:
device_resume();
Resume_console:
resume_console();
@@ -406,11 +445,12 @@ int hibernate(void)
if (error)
goto Finish;
- if (hibernation_mode == HIBERNATION_TESTPROC) {
- printk("swsusp debug: Waiting for 5 seconds.\n");
- mdelay(5000);
+ if (hibernation_test(TEST_FREEZER))
goto Thaw;
- }
+
+ if (hibernation_testmode(HIBERNATION_TESTPROC))
+ goto Thaw;
+
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
if (in_suspend && !error) {
unsigned int flags = 0;
Index: linux-2.6/kernel/power/power.h
===================================================================
--- linux-2.6.orig/kernel/power/power.h
+++ linux-2.6/kernel/power/power.h
@@ -192,3 +192,5 @@ enum {
TEST_DEVICES,
TEST_FREEZER
};
+
+extern int pm_test_level;
-
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