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authorRafael J. Wysocki <rjw@sisk.pl>2007-11-19 23:42:31 +0100
committerLen Brown <len.brown@intel.com>2008-02-02 00:30:54 +0100
commit4cc79776c9ea431790e04fcacbebb30d28eb1570 (patch)
tree42eb5b8c5f2a2d1fcfb1dae8fa77ad70be209cbb /kernel
parentsuspend: build fix responding to 2.6.25 kset change (diff)
downloadlinux-4cc79776c9ea431790e04fcacbebb30d28eb1570.tar.xz
linux-4cc79776c9ea431790e04fcacbebb30d28eb1570.zip
Hibernation: New testing facility (rev. 2)
Make it possible to test the hibernation core code with the help of the /sys/power/pm_test attribute introduced for suspend testing in the previous patch. Writing an appropriate string to this file causes the hibernation code to work in one of the test modes defined as follows: freezer - test the freezing of processes devices - test the freezing of processes and suspending of devices platform - test the freezing of processes, suspending of devices and platform global   control methods(*) processors - test the freezing of processes, suspending of devices, platform global   control methods(*) and the disabling of nonboot CPUs core - 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 given 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@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/disk.c70
-rw-r--r--kernel/power/power.h2
2 files changed, 57 insertions, 15 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 659736508239..0866b163c6bb 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -70,6 +70,35 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
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_mode)
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;
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 9f9e16e33962..f9f0d4d26c50 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -206,3 +206,5 @@ enum {
#define TEST_FIRST TEST_NONE
#define TEST_MAX (__TEST_AFTER_LAST - 1)
+
+extern int pm_test_level;