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authorRafael J. Wysocki <rjw@sisk.pl>2006-11-02 22:07:19 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-11-03 12:27:58 -0800
commitb918f6e62cd46774f9fc0a3fbba6bd10ad85ee14 (patch)
treed73dc0e8823c8445d84701cc3d527e0e34494a32 /kernel/power
parent90d53909443b3986569b38ef145f09ea2359af75 (diff)
[PATCH] swsusp: debugging
Add a swsusp debugging mode. This does everything that's needed for a suspend except for actually suspending. So we can look in the log messages and work out a) what code is being slow and b) which drivers are misbehaving. (1) # echo testproc > /sys/power/disk # echo disk > /sys/power/state This should turn off the non-boot CPU, freeze all processes, wait for 5 seconds and then thaw the processes and the CPU. (2) # echo test > /sys/power/disk # echo disk > /sys/power/state This should turn off the non-boot CPU, freeze all processes, shrink memory, suspend all devices, wait for 5 seconds, resume the devices etc. Cc: Pavel Machek <pavel@ucw.cz> Cc: Stefan Seyfried <seife@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c37
1 files changed, 28 insertions, 9 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index d3a158a60312..b1fb7866b0b3 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -71,7 +71,7 @@ static inline void platform_finish(void)
static int prepare_processes(void)
{
- int error;
+ int error = 0;
pm_prepare_console();
@@ -84,6 +84,12 @@ static int prepare_processes(void)
goto thaw;
}
+ if (pm_disk_mode == PM_DISK_TESTPROC) {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ goto thaw;
+ }
+
/* Free memory before shutting down devices. */
if (!(error = swsusp_shrink_memory()))
return 0;
@@ -120,13 +126,21 @@ int pm_suspend_disk(void)
if (error)
return error;
+ if (pm_disk_mode == PM_DISK_TESTPROC)
+ goto Thaw;
+
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error) {
resume_console();
printk("Some devices failed to suspend\n");
- unprepare_processes();
- return error;
+ goto Thaw;
+ }
+
+ if (pm_disk_mode == PM_DISK_TEST) {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ goto Done;
}
pr_debug("PM: snapshotting memory.\n");
@@ -143,16 +157,17 @@ int pm_suspend_disk(void)
power_down(pm_disk_mode);
else {
swsusp_free();
- unprepare_processes();
- return error;
+ goto Thaw;
}
- } else
+ } else {
pr_debug("PM: Image restored successfully.\n");
+ }
swsusp_free();
Done:
device_resume();
resume_console();
+ Thaw:
unprepare_processes();
return error;
}
@@ -249,6 +264,8 @@ static const char * const pm_disk_modes[] = {
[PM_DISK_PLATFORM] = "platform",
[PM_DISK_SHUTDOWN] = "shutdown",
[PM_DISK_REBOOT] = "reboot",
+ [PM_DISK_TEST] = "test",
+ [PM_DISK_TESTPROC] = "testproc",
};
/**
@@ -303,17 +320,19 @@ static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
}
}
if (mode) {
- if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
+ if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
+ mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
pm_disk_mode = mode;
- else {
+ } else {
if (pm_ops && pm_ops->enter &&
(mode == pm_ops->pm_disk_mode))
pm_disk_mode = mode;
else
error = -EINVAL;
}
- } else
+ } else {
error = -EINVAL;
+ }
pr_debug("PM: suspend-to-disk mode set to '%s'\n",
pm_disk_modes[mode]);