[PATCH v2 0/9] powerpc/powernv/cpuidle: Add support for POWER ISA v3 idle states

Shreyas B. Prabhu
2016-05-03T08:24:57Z

POWER ISA v3 defines a new idle processor core mechanism. In summary,
a) new instruction named stop is added. This instruction replaces
instructions like nap, sleep, rvwinkle.
b) new per thread SPR named PSSCR is added which controls the behavior
of stop instruction.

PSSCR has following key fields
Bits 0:3 - Power-Saving Level Status. This field indicates the
lowest power-saving state the thread entered since stop
instruction was last executed.

Bit 42 - Enable State Loss
0 - No state is lost irrespective of other fields
1 - Allows state loss

Bits 44:47 - Power-Saving Level Limit
This limits the power-saving level that can be entered into.

Bits 60:63 - Requested Level
Used to specify which power-saving level must be entered on
executing stop instruction

Stop idle states and their properties like name, latency, target
residency, psscr value are exposed via device tree.

This patch series adds support for this new mechanism.

Patches 1-6 are cleanups and code movement.
Patch 7 adds platform specific support for stop and psscr handling.
Patch 8 adds cpuidle driver support.
Patch 9 makes offlined cpu use stop state.

Changes in v2
=============
- Rebased on v4.6-rc6
- Using CPU_FTR_ARCH_300 bit instead of CPU_FTR_STOP_INST

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-pm@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Michael Neuling <mikey@neuling.org>
Cc: linuxppc-dev@lists.ozlabs.org

Shreyas B. Prabhu (9):
powerpc/powernv: Move CHECK_HMI_INTERRUPT to exception-64s header
powerpc/kvm: make hypervisor state restore a function
powerpc/powernv: Move idle code usable by multiple hardware to common
location
powerpc/powernv: Make power7_powersave_common more generic
powerpc/powernv: Move idle related macros to cpuidle.h
powerpc/powernv: set power_save func after the idle states are
initialized
powerpc/powernv: Add platform support for stop instruction
cpuidle/powernv: Add support for POWER ISA v3 idle states
powerpc/powernv: Use deepest stop state when cpu is offlined

arch/powerpc/include/asm/cpuidle.h | 29 ++++
arch/powerpc/include/asm/exception-64s.h | 18 +++
arch/powerpc/include/asm/kvm_book3s_asm.h | 2 +-
arch/powerpc/include/asm/machdep.h | 1 +
arch/powerpc/include/asm/opal-api.h | 11 +-
arch/powerpc/include/asm/paca.h | 4 +
arch/powerpc/include/asm/ppc-opcode.h | 4 +
arch/powerpc/include/asm/processor.h | 1 +
arch/powerpc/include/asm/reg.h | 11 ++
arch/powerpc/kernel/Makefile | 2 +
arch/powerpc/kernel/asm-offsets.c | 4 +
arch/powerpc/kernel/exceptions-64s.S | 29 +---
arch/powerpc/kernel/idle_power7.S | 212 +++-------------------------
arch/powerpc/kernel/idle_power_common.S | 185 +++++++++++++++++++++++++
arch/powerpc/kernel/idle_power_stop.S | 221 ++++++++++++++++++++++++++++++
arch/powerpc/platforms/Kconfig | 4 +
arch/powerpc/platforms/powernv/Kconfig | 1 +
arch/powerpc/platforms/powernv/idle.c | 94 +++++++++++--
arch/powerpc/platforms/powernv/powernv.h | 1 +
arch/powerpc/platforms/powernv/setup.c | 2 +-
arch/powerpc/platforms/powernv/smp.c | 4 +-
drivers/cpuidle/cpuidle-powernv.c | 57 +++++++-
22 files changed, 659 insertions(+), 238 deletions(-)
create mode 100644 arch/powerpc/kernel/idle_power_common.S
create mode 100644 arch/powerpc/kernel/idle_power_stop.S

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2.4.11