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SubjectRe: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Hi,
Any updates on this patch series?

On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote:
> Fast sleep is an idle state, where the core and the L1 and L2
> caches are brought down to a threshold voltage. This also means that
> the communication between L2 and L3 caches have to be fenced. However
> the current P8 chips have a bug wherein this fencing between L2 and
> L3 caches get delayed by a cpu cycle. This can delay L3 response to
> the other cpus if they request for data during this time. Thus they
> would fetch the same data from the memory which could lead to data
> corruption if L3 cache is not flushed.
> Patch 4 adds support to work around this.
>
> 'Deep Winkle' is a deeper idle state where core and private L2 are powered
> off. While it offers higher power savings, it is at the cost of losing
> hypervisor register state and higher latency.
> Patch 5-9 adds support for winkle and uses it for offline cpus.
>
> Patch 1 - Moves parameters required discover idle states to a location
> common to both cpuidle driver and powernv core code
> Patch 2 - Populates idle state details from device tree
> Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle
>
>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Srivatsa S. Bhat <srivatsa@MIT.EDU>
> Cc: Preeti U. Murthy <preeti@linux.vnet.ibm.com>
> Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Grant Likely <grant.likely@linaro.org>
> Cc: devicetree@vger.kernel.org
> Cc: linux-pm@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
>
> Preeti U Murthy (2):
> cpuidle/powernv: Populate cpuidle state details by querying the
> device-tree
> powerpc/powernv/cpuidle: Add workaround to enable fastsleep
>
> Shreyas B. Prabhu (6):
> powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from
> fast-sleep
> powerpc/powernv: Add OPAL call to save and restore
> powerpc: Adding macro for accessing Thread Switch Control Register
> powerpc/powernv: Add winkle infrastructure
> powerpc/powernv: Discover and enable winkle
> powerpc/powernv: Enter deepest supported idle state in offline
>
> Srivatsa S. Bhat (1):
> powerpc/powernv: Enable Offline CPUs to enter deep idle states
>
> arch/powerpc/include/asm/machdep.h | 4 +
> arch/powerpc/include/asm/opal.h | 10 ++
> arch/powerpc/include/asm/paca.h | 3 +
> arch/powerpc/include/asm/ppc-opcode.h | 2 +
> arch/powerpc/include/asm/processor.h | 6 +-
> arch/powerpc/include/asm/reg.h | 1 +
> arch/powerpc/kernel/asm-offsets.c | 1 +
> arch/powerpc/kernel/exceptions-64s.S | 37 ++---
> arch/powerpc/kernel/idle.c | 30 ++++
> arch/powerpc/kernel/idle_power7.S | 83 +++++++++-
> arch/powerpc/platforms/powernv/opal-wrappers.S | 2 +
> arch/powerpc/platforms/powernv/powernv.h | 8 +
> arch/powerpc/platforms/powernv/setup.c | 217 +++++++++++++++++++++++++
> arch/powerpc/platforms/powernv/smp.c | 13 +-
> arch/powerpc/platforms/powernv/subcore.c | 15 ++
> drivers/cpuidle/cpuidle-powernv.c | 40 ++++-
> 16 files changed, 439 insertions(+), 33 deletions(-)
>



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