* Implementing PowerManagment for a ppc target
@ 2004-11-30 21:40 Sylvain Munaut
2004-11-30 22:53 ` Benjamin Herrenschmidt
2004-11-30 23:35 ` Hollis Blanchard
0 siblings, 2 replies; 3+ messages in thread
From: Sylvain Munaut @ 2004-11-30 21:40 UTC (permalink / raw)
To: Linux PPC Dev
Hi,
I'm trying to implement Deep Sleep support for a ppc platform based on
5200 and I have some questions :
- How should I "integrate" it to linux, what the proper way ? I've been
trying #defining CONFIG_PM and
using the set_pm_ops operation but my call backs never get called
when doing a echo standby > /sys/power/state
It justs says :
$ echo standby >
/sys/power/state
Stopping tasks:
===
stopping tasks failed (2 tasks
remaining)
Restarting tasks...<6> Strange, init not
stopped
Strange, sh not
stopped
done
Stopping tasks:
===
stopping tasks failed (2 tasks
remaining)
Restarting tasks...<6> Strange, init not
stopped
Strange, sh not
stopped
done
I've been trying to look at Documentation/ and the sources but still I'm
not sure ...
- How can I ensure that one of my function runs out of I Cache ? Some
pieces of assembler needs to not
acces memory when the last 'orders' are sent. Does just keeping it
small and aligned enough ?
Thanks,
Sylvain Munaut
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Implementing PowerManagment for a ppc target
2004-11-30 21:40 Implementing PowerManagment for a ppc target Sylvain Munaut
@ 2004-11-30 22:53 ` Benjamin Herrenschmidt
2004-11-30 23:35 ` Hollis Blanchard
1 sibling, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2004-11-30 22:53 UTC (permalink / raw)
To: Sylvain Munaut; +Cc: linuxppc-dev list
On Tue, 2004-11-30 at 22:40 +0100, Sylvain Munaut wrote:
> Hi,
>
> I'm trying to implement Deep Sleep support for a ppc platform based on
> 5200 and I have some questions :
>
> - How should I "integrate" it to linux, what the proper way ? I've been
> trying #defining CONFIG_PM and
> using the set_pm_ops operation but my call backs never get called
> when doing a echo standby > /sys/power/state
>
> It justs says :
>
> $ echo standby >
> /sys/power/state
>
> Stopping tasks:
> ===
Looks like a kernel thread isn't properly stopping ... note that on
pmac, I don't call that PM core, I do my own salad which does not
involve stopping tasks...
> stopping tasks failed (2 tasks
> remaining)
> Restarting tasks...<6> Strange, init not
> stopped
> Strange, sh not
> stopped
>
> done
>
> Stopping tasks:
> ===
>
> stopping tasks failed (2 tasks
> remaining)
> Restarting tasks...<6> Strange, init not
> stopped
> Strange, sh not
> stopped
>
> done
>
> I've been trying to look at Documentation/ and the sources but still I'm
> not sure ...
>
>
> - How can I ensure that one of my function runs out of I Cache ? Some
> pieces of assembler needs to not
> acces memory when the last 'orders' are sent. Does just keeping it
> small and aligned enough ?
Can you explain more precisely why and what are your precise
requirements ? (You can catch me on irc eventually)
>
> Thanks,
>
> Sylvain Munaut
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
--
Benjamin Herrenschmidt <benh@kernel.crashing.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Implementing PowerManagment for a ppc target
2004-11-30 21:40 Implementing PowerManagment for a ppc target Sylvain Munaut
2004-11-30 22:53 ` Benjamin Herrenschmidt
@ 2004-11-30 23:35 ` Hollis Blanchard
1 sibling, 0 replies; 3+ messages in thread
From: Hollis Blanchard @ 2004-11-30 23:35 UTC (permalink / raw)
To: Linux PPC Dev
On Nov 30, 2004, at 3:40 PM, Sylvain Munaut wrote:
>
> I'm trying to implement Deep Sleep support for a ppc platform based on
> 5200 and I have some questions :
>
> - How should I "integrate" it to linux, what the proper way ? I've
> been trying #defining CONFIG_PM and
> using the set_pm_ops operation but my call backs never get called
> when doing a echo standby > /sys/power/state
> [...]
> I've been trying to look at Documentation/ and the sources but still
> I'm not sure ...
>
>
> - How can I ensure that one of my function runs out of I Cache ? Some
> pieces of assembler needs to not
> acces memory when the last 'orders' are sent. Does just keeping it
> small and aligned enough ?
You can see an example of the icache code in the linuxppc-2.4 tree,
arch/ppc/platforms/ibm405lp_pmasm.S, after
"_GLOBAL(ibm405lp_pm_command)". (You probably won't need to save and
restore all CPU state though; that was needed because the 405LP was
*really* powered down, not just paused.)
You can also see how that code is triggered from ibm405lp_pm.c . I
don't think that's integrated with any laptop-style sleep work that's
been done in the past 1.5 years, but it works with /proc/sys/sleep
anyways (see Documentation/powerpc/405LP-sleep.txt).
-Hollis
^ permalink raw reply [flat|nested] 3+ messages in thread
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2004-11-30 22:53 ` Benjamin Herrenschmidt
2004-11-30 23:35 ` Hollis Blanchard
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