Re: suspend hangs at platform phase [was: mmotm 2010-12-23-16-58 uploaded]

Rafael J. Wysocki
2011-01-04T22:58:10Z

On Tuesday, January 04, 2011, Jiri Slaby wrote:
> On 01/04/2011 02:40 PM, Jiri Slaby wrote:
> > On 12/24/2010 01:58 AM, akpm@linux-foundation.org wrote:
> >> The mm-of-the-moment snapshot 2010-12-23-16-58 has been uploaded to
> >
> > Hi, this kernel regresses with respect to suspend to ram in comparison
> > with mmotm 2010-12-16-14-56.
> >
> > This is OK:
> > echo devices > /sys/power/pm_test
> > pm-suspend
> > This hangs at suspend phase:
> > echo platform > /sys/power/pm_test
> > pm-suspend

Hmm. So it looks like _PTS hangs?

> > Note that this kernel is based on next-20101221. Should I try newer (and
> > clean) -next?
>
> Ok, bisected down to:
> 16dc39c98a6ca56a27f22f7ac6731d8223237a2e is first bad commit
> commit 16dc39c98a6ca56a27f22f7ac6731d8223237a2e
> Author: Len Brown <len.brown@intel.com>
> Date: Thu Dec 16 23:12:23 2010 -0500
>
> ACPI: use ioremap_cache()
>
> Although the temporary boot-time ACPI table mappings
> were set up with CPU caching enabled, the permanent table
> mappings and AML run-time region memory accesses were
> set up with ioremap(), which on x86 is a synonym for
> ioremap_nocache().
>
> Changing this to ioremap_cache() improves performance as
> seen when accessing the tables via acpidump,
> or /sys/firmware/acpi/tables. It should also improve
> AML run-time performance.
>
> No change on ia64.
>
> Reported-by: Jack Steiner <steiner@sgi.com>
> Signed-off-by: Len Brown <len.brown@intel.com>
>
> :040000 040000 be35c5e8f214f10f94688c1a27f33ecfb8505220
> 52581222d0edf190f160f3e5aa5d2c1af8e76988 M arch
> :040000 040000 ccdca0d41938b8312e946cde3c01c59b32d1c17c
> 96ccf2357f2ac4a31d19cc41f5728d9f87b6cac0 M drivers
>
> Revert of that patch fixes the problem.

Can you send a dmesg output and acpidump output from the failing system, please?

Rafael