linux-kernel - [v3 PATCH 0/4] powernv:idle: Fixes for CPU-Hotplug on POWER DD1.0

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Date:   Wed, 22 Mar 2017 20:34:13 +0530
From:   "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Michael Neuling <mikey@...ling.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Shreyas B. Prabhu" <shreyasbp@...il.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Anton Blanchard <anton@...ba.org>,
        Balbir Singh <bsingharora@...il.com>,
        Akshay Adiga <akshay.adiga@...ux.vnet.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
Subject: [v3 PATCH 0/4] powernv:idle: Fixes for CPU-Hotplug on POWER DD1.0

From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>

Hi,

This is the third version of the patchset containing the fixes to
make CPU-Hotplug working on correctly on POWER9 DD1 systems.

The earlier versions can be found here:
[v2] : https://lkml.org/lkml/2017/3/20/555
[v1] : https://lkml.org/lkml/2017/3/13/46

The only change in this patch series from v2 are the following
optimizations suggested by Nicholas Piggin.

- Dynamically allocate the thread_sibling_pacas array to contain
  "threads_per_core" number of slots instead of declaring the array
  size upfront.

- Use SPRN_TIR instead of (SPRN_PIR & 0x3) to determine the thread's
  index within a core.

Patch 4 in the series requires Nicholas Piggin's ack. Rest of the
patches are unchanged from the previous version.

These patches are based on v4.11-rc3.

The patches have been tested with stop1 (ESL=EC=1) as the
deepest-state entered into during CPU-Hotplug.

Gautham R. Shenoy (4):
  powernv: Move CPU-Offline idle state invocation from smp.c to idle.c
  powernv:smp: Add busy-wait loop as fall back for CPU-Hotplug
  powernv:idle: Don't override default/deepest directly in kernel
  powernv: Recover correct PACA on wakeup from a stop on P9 DD1

 arch/powerpc/include/asm/cpuidle.h       |  1 +
 arch/powerpc/include/asm/paca.h          |  5 ++
 arch/powerpc/kernel/asm-offsets.c        |  1 +
 arch/powerpc/kernel/idle_book3s.S        | 48 +++++++++++++++-
 arch/powerpc/platforms/powernv/idle.c    | 96 ++++++++++++++++++++++++++------
 arch/powerpc/platforms/powernv/powernv.h |  2 -
 arch/powerpc/platforms/powernv/smp.c     | 18 +-----
 7 files changed, 136 insertions(+), 35 deletions(-)

-- 
1.9.4