On Tue, Feb 22, 2011 at 12:43 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Sat, Feb 19, 2011 at 03:12:37PM -0800, Shriram Rajagopalan wrote:
>> Use PM_FREEZE, PM_THAW and PM_RESTORE power events for
>> suspend/resume/checkpoint functionality, instead of PM_SUSPEND
>> and PM_RESUME. Use of these pm events fixes the Xen Guest hangup
>> when taking checkpoints. When a suspend event is cancelled
>> (while taking checkpoints once/continuously), we use PM_THAW
>> instead of PM_RESUME. PM_RESTORE is used when suspend is not
>> cancelled. See Documentation/power/devices.txt and linux/pm.h
>> for more info about freeze, thaw and restore. The sequence of
>> pm events in a suspend-resume scenario is shown below.
>>
>> dpm_suspend_start(PMSG_FREEZE);
>>
>> dpm_suspend_noirq(PMSG_FREEZE);
>>
>> sysdev_suspend(PMSG_FREEZE);
>> cancelled = suspend_hypercall()
>> sysdev_resume();
>>
>> dpm_resume_noirq(cancelled ? PMSG_THAW : PMSG_RESTORE);
>>
>> dpm_resume_end(cancelled ? PMSG_THAW : PMSG_RESTORE);
>>
>> Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
>> ---
>> drivers/base/power/main.c | 8 ++++----
>> drivers/xen/manage.c | 16 ++++++++--------
>> drivers/xen/xenbus/xenbus_probe_frontend.c | 8 +++++---
>> 3 files changed, 17 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
>> index 8340497..aab4f60 100644
>> --- a/drivers/base/power/main.c
>> +++ b/drivers/base/power/main.c
>> @@ -233,7 +233,7 @@ static int pm_op(struct device *dev,
>> }
>> break;
>> #endif /* CONFIG_SUSPEND */
>> -#ifdef CONFIG_HIBERNATION
>> +#if defined(CONFIG_HIBERNATION) || defined(CONFIG_XEN_SAVE_RESTORE)
>
> Could we just make CONFIG_XEN_SAVE_RESTORE depend on CONFIG_HIBERANTION?
> Like this:
>
>
> diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
> index 5b54892..838e20c 100644
> --- a/arch/x86/xen/Kconfig
> +++ b/arch/x86/xen/Kconfig
> @@ -38,7 +38,7 @@ config XEN_MAX_DOMAIN_MEMORY
>
> config XEN_SAVE_RESTORE
> bool
> - depends on XEN && PM
> + depends on XEN && PM && HIBERNATION
> default y
>
> config XEN_DEBUG_FS
>
>
On that aspect, just noticed
config PM_SLEEP
bool
depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
default y
we could get rid of XEN_SAVE_RESTORE as the suspend/resume code doesnt
depend on PM_SLEEP
anymore.
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