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[PATCH] swsusp: debugging

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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>
This commit is contained in:
Rafael J. Wysocki 2006-11-02 22:07:19 -08:00 • committed by Linus Torvalds
parent 90d5390944
commit b918f6e62c
4 changed files with 60 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

37
kernel/power/disk.c
View file

@ -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]);