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Date: Tue, 30 Sep 2014 22:13:45 +0200 From: "Rafael J. Wysocki" <rjw@...ysocki.net> To: Shreyas B Prabhu <shreyas@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, "Srivatsa S. Bhat" <srivatsa@....edu>, "Preeti U. Murthy" <preeti@...ux.vnet.ibm.com>, Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>, Rob Herring <robh+dt@...nel.org>, Grant Likely <grant.likely@...aro.org>, devicetree@...r.kernel.org, linux-pm@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org Subject: Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle On Tuesday, September 30, 2014 01:42:05 PM Shreyas B Prabhu wrote: > Hi Rafael, > > On Tuesday 30 September 2014 04:58 AM, Rafael J. Wysocki wrote: > > On Monday, September 29, 2014 03:53:06 PM Shreyas B Prabhu wrote: > >> Hi, > >> Any updates on this patch series? > > > > I have a couple of patches from there in my tree it seems. Please have a look > > at linux-pm.git/linux-next and please let me know if that's the case. > > > > I checked linux-pm.git/linux-net (Last commit 067c17382165). None of the patches > in this series are present in the tree. OK, thanks for checking. Would you mind resending it with any ACKs or Reviewed-by tags received so far? > >> On Thursday 18 September 2014 08:41 AM, Shreyas B Prabhu wrote: > >>> Hi, > >>> > >>> In this patch series we use winkle for offlined cores. I successfully > >>> tested the working of this with subcore functionality. > >>> > >>> Test scenario was as follows: > >>> 1. Set SMT mode to 1, Set subores-per-core to 1 > >>> 2. Offline a core, in this case cpu 32 (sending it to winkle) > >>> 3. Set subcores-per-core to 4 > >>> 4. Online the core > >>> 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case > >>> on cpu 36 > >>> > >>> This works without any glitch. > >>> > >>> Thanks, > >>> Shreyas > >>> > >>> 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@...nel.crashing.org> > >>>> Cc: Paul Mackerras <paulus@...ba.org> > >>>> Cc: Michael Ellerman <mpe@...erman.id.au> > >>>> Cc: Rafael J. Wysocki <rjw@...ysocki.net> > >>>> Cc: Srivatsa S. Bhat <srivatsa@....EDU> > >>>> Cc: Preeti U. Murthy <preeti@...ux.vnet.ibm.com> > >>>> Cc: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> > >>>> Cc: Rob Herring <robh+dt@...nel.org> > >>>> Cc: Grant Likely <grant.likely@...aro.org> > >>>> Cc: devicetree@...r.kernel.org > >>>> Cc: linux-pm@...r.kernel.org > >>>> Cc: linuxppc-dev@...ts.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(-) > >>>> > >> > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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