[Conditional Ack] [utopic][sru][pull-request] powernv: cpuidle: enable fastsleep and winkle LP: #1400411

[Andy Whitcroft]

On Fri, Jan 09, 2015 at 12:54:14PM -0600, Chris J Arges wrote:
> BugLink: http://bugs.launchpad.net/bugs/1400411
> 
> --
> 
> The following changes since commit 33f25ec7e9c08ac03c87bb08c83c2c3acc79f83c:
> 
>   Linux 3.16.7-ckt3 (2015-01-08 16:29:10 +0000)
> 
> are available in the git repository at:
> 
>   git://kernel.ubuntu.com/arges/ubuntu-utopic.git lp1400411
> 
> for you to fetch changes up to 7f0f6e7dca5746c70683eb3ac391a1b5886e13fb:
> 
>   powernv/powerpc: Add winkle support for offline cpus (2015-01-09
> 12:33:18 -0600)
> 
> ----------------------------------------------------------------
> Paul Mackerras (3):
>       powerpc/powernv: Don't call generic code on offline cpus
>       powerpc/powernv: Return to cpu offline loop when finished in KVM guest
>       powerpc/powernv: Switch off MMU before entering nap/sleep/rvwinkle
> mode
> 
> Shreyas B. Prabhu (3):
>       powerpc/powernv: Enable Offline CPUs to enter deep idle states
>       powernv/cpuidle: Redesign idle states management
>       powernv/powerpc: Add winkle support for offline cpus
> 
>  arch/powerpc/include/asm/cpuidle.h             |  20 ++++
>  arch/powerpc/include/asm/opal.h                |  13 +++
>  arch/powerpc/include/asm/paca.h                |   8 ++
>  arch/powerpc/include/asm/ppc-opcode.h          |   2 +
>  arch/powerpc/include/asm/processor.h           |   5 +-
>  arch/powerpc/include/asm/reg.h                 |   4 +
>  arch/powerpc/include/asm/xics.h                |   1 +
>  arch/powerpc/kernel/asm-offsets.c              |  11 ++
>  arch/powerpc/kernel/exceptions-64s.S           |  37 ++++--
>  arch/powerpc/kernel/idle_power7.S              | 358
> +++++++++++++++++++++++++++++++++++++++++++++++++++--------
>  arch/powerpc/kvm/book3s_hv_rmhandlers.S        |  54 ++++++---
>  arch/powerpc/platforms/powernv/opal-wrappers.S |  38 +++++++
>  arch/powerpc/platforms/powernv/powernv.h       |   2 +
>  arch/powerpc/platforms/powernv/setup.c         | 166
> +++++++++++++++++++++++++++
>  arch/powerpc/platforms/powernv/smp.c           |  34 +++++-
>  arch/powerpc/platforms/powernv/subcore.c       |  35 ++++++
>  arch/powerpc/platforms/powernv/subcore.h       |   9 +-
>  arch/powerpc/sysdev/xics/icp-native.c          |  25 +++++
>  drivers/cpuidle/cpuidle-powernv.c              |  10 +-
>  19 files changed, 743 insertions(+), 89 deletions(-)
>  create mode 100644 arch/powerpc/include/asm/cpuidle.h

This pile of change is a huge heap of completely unreviewable assembly
changes.  It seems to be very power7 specific and so the risk of it
affecting other platforms seems low.  Could you confirm that IBM have
signed off on the backports if they are yours?  Otherwise, gah, this
will need to be well tested before release.

If they have been reviewed by IBM:

Acked-by: Andy Whitcroft <apw at canonical.com>

-apw