Re: [PATCH i-g-t 2/4] lib: Skip suspend/hibernate tests if the system doesn't support them

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Oct 27, 2015 at 08:58:17AM +0200, David Weinehall wrote:
> On Fri, Oct 23, 2015 at 12:39:31PM -0700, Jesse Barnes wrote:
> > On 10/22/2015 01:35 PM, ville.syrjala@linux.intel.com wrote:
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > 
> > > Do a dry run with rtcwake first to determine if the system even supports
> > > the intended suspend state. If not, skip the test.
> > > 
> > > Fixes a bunch of stuff on my BYT FFRD8 that doesn't support S3.
> > > 
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > ---
> > >  lib/igt_aux.c | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/lib/igt_aux.c b/lib/igt_aux.c
> > > index 04ca25b..f3c76ae 100644
> > > --- a/lib/igt_aux.c
> > > +++ b/lib/igt_aux.c
> > > @@ -357,6 +357,9 @@ void igt_system_suspend_autoresume(void)
> > >  	 * seems to fare better. We need to investigate what's going on. */
> > >  	igt_skip_on_simulation();
> > >  
> > > +	/* skip if system doesn't support suspend-to-mem */
> > > +	igt_skip_on(system("rtcwake -n -s 30 -m mem") != 0);
> > > +
> > >  	ret = system("rtcwake -s 30 -m mem");
> > >  	igt_assert_f(ret == 0,
> > >  		     "This failure means that something is wrong with the "
> > > @@ -384,6 +387,9 @@ void igt_system_hibernate_autoresume(void)
> > >  	 * seems to fare better. We need to investigate what's going on. */
> > >  	igt_skip_on_simulation();
> > >  
> > > +	/* skip if system doesn't support suspend-to-disk */
> > > +	igt_skip_on(system("rtcwake -n -s 90 -m disk") != 0);
> > > +
> > >  	/* The timeout might need to be adjusted if hibernation takes too long
> > >  	 * or if we have to wait excessively long before resume
> > >  	 */
> > > 
> > 
> > Are there reliable alternatives to the rtcwake alarm?
> > Maybe some AMT/MEI wakeup event or some ACPI clock thing (handwaving pretty hard here)?
> 
> Depending on what the hardware supports, for hibernate to disk there's ipmi power-on.
> 
> ipmi-power -h $hostname --stat will show the status of the machine,
> ipmi-power -h $hostname --on will power it on.

I would have expected to see IPMI only on server platforms. Has it
become more widespread at some point?

-- 
Ville Syrjälä
Intel OTC
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