On Thursday 02 October 2014 02:16 AM, Rafael J. Wysocki wrote: > On Wednesday, October 01, 2014 01:15:57 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. >> >> This series overcomes above problem in kernel. >> >> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> >> Cc: Paul Mackerras <pau...@samba.org> >> Cc: Michael Ellerman <m...@ellerman.id.au> >> Cc: Rafael J. Wysocki <r...@rjwysocki.net> >> Cc: linux...@vger.kernel.org >> Cc: linuxppc-dev@lists.ozlabs.org >> Cc: Srivatsa S. Bhat <sriva...@mit.edu> >> Cc: Preeti U. Murthy <pre...@linux.vnet.ibm.com> >> Cc: Vaidyanathan Srinivasan <sva...@linux.vnet.ibm.com> >> >> v2: >> Rebased on 3.17-rc7 >> Split from 'powerpc/powernv: Support for fastsleep and winkle' >> >> v1: >> https://lkml.org/lkml/2014/8/25/446 >> >> Preeti U Murthy (1): >> powerpc/powernv/cpuidle: Add workaround to enable fastsleep >> >> Shreyas B. Prabhu (1): >> powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from >> fast-sleep >> >> Srivatsa S. Bhat (1): >> powerpc/powernv: Enable Offline CPUs to enter deep idle states >> >> arch/powerpc/include/asm/machdep.h | 3 + >> arch/powerpc/include/asm/opal.h | 7 ++ >> arch/powerpc/include/asm/processor.h | 4 +- >> arch/powerpc/kernel/exceptions-64s.S | 35 ++++---- >> arch/powerpc/kernel/idle.c | 19 ++++ >> arch/powerpc/kernel/idle_power7.S | 2 +- >> arch/powerpc/platforms/powernv/opal-wrappers.S | 1 + >> arch/powerpc/platforms/powernv/powernv.h | 7 ++ >> arch/powerpc/platforms/powernv/setup.c | 118 >> +++++++++++++++++++++++++ >> arch/powerpc/platforms/powernv/smp.c | 11 ++- >> drivers/cpuidle/cpuidle-powernv.c | 13 ++- >> 11 files changed, 194 insertions(+), 26 deletions(-) > > [2/3] seems to be missig from the series. > > Also, since that mostly modifies arch/powerpc, I think it should go through > that tree. I'm fine with the cpuidle-powernv changes in [1/3] and [3/3]. > Hi Rafael,
Thanks for looking into this. The second patch is an independent fix in the powerpc exception handler. To be safe I am ccing you and linux-pm list on that patch now. Thanks, Shreyas _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
