On Mon, 2007-11-19 at 19:22 +0100, Rafael J. Wysocki wrote:
> > +#ifdef CONFIG_KEXEC
> > +static void kexec_hibernate_power_down(void)
> > +{
> > + switch (hibernation_mode) {
> > + case HIBERNATION_TEST:
> > + case HIBERNATION_TESTPROC:
> > + break;
> > + case HIBERNATION_REBOOT:
> > + machine_restart(NULL);
> > + break;
> > + case HIBERNATION_PLATFORM:
> > + if (!hibernation_ops)
> > + break;
> > + hibernation_ops->enter();
>
> hibernation_platform_enter() should be used here (as of the current mainline).
The power_down will be called with interrupt disabled, device suspended,
non-boot CPU disabled. But the latest hibernate_platform_enter calls the
device_suspend, disable_nonboot_cpus etc function. So, I use
hibernation_ops->enter() directly instead of
hibernation_platform_enter().
> > + /* We should never get here */
> > + while (1);
> > + break;
> > + case HIBERNATION_SHUTDOWN:
> > + machine_power_off();
> > + break;
> > + }
> > + machine_halt();
> > + /*
> > + * Valid image is on the disk, if we continue we risk serious data
> > + * corruption after resume.
> > + */
> > + printk(KERN_CRIT "Please power me down manually\n");
> > + while (1);
> > +}
>
> Hm, what's the difference between the above function and power_down(),
> actually?
Same as above.
> > +
> > +int kexec_hibernate(struct kimage *image)
> > +{
> > + int error;
> > + int platform_mode = (hibernation_mode == HIBERNATION_PLATFORM);
> > + unsigned long cmd_ret;
> > +
> > + mutex_lock(&pm_mutex);
> > +
> > + pm_prepare_console();
> > + suspend_console();
> > +
> > + error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
> > + if (error)
> > + goto Resume_console;
> > +
> > + error = platform_start(platform_mode);
> > + if (error)
> > + goto Resume_console;
> > +
> > + error = device_suspend(PMSG_FREEZE);
> > + if (error)
> > + goto Resume_console;
> > +
> > + error = platform_pre_snapshot(platform_mode);
> > + if (error)
> > + goto Resume_devices;
> > +
> > + error = disable_nonboot_cpus();
> > + if (error)
> > + goto Resume_devices;
>
> I wonder if it's viable to merge the above with hibernate() and
> hibernation_snapshot() somehow, to avoid code duplication?
Yes. Most code are duplicated. But there is one advantage not to merge
them: power_down can called with IRQ disabled to make it possible to
eliminate the freezer.
I think it is possible to merge the two implementation. I will try to do
it.
> Apart from the above, there's some new debug code to be added to disk.c
> in 2.6.25. It's in the ACPI test tree right now and you can get it as
> individual patches from:
> http://www.sisk.pl/kernel/hibernation_and_suspend/2.6.24-rc2/patches/
> (patches 10-12).
>
> Please base your changes on top of that.
OK, I will do it.
Best Regards,
Huang Ying
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