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authorMichael Ellerman <mpe@ellerman.id.au>2014-05-23 18:15:30 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-05-28 13:35:37 +1000
commite2186023f2d81ee7bb42d2a7dec3d889df7cdace (patch)
treefdc949d0563aeabdce47ab8b49ee25c760e0ca7b /arch/powerpc/platforms/powernv/Makefile
parent3102f7843c75014fa15d3e6fda3b49f61bc467b4 (diff)
downloadop-kernel-dev-e2186023f2d81ee7bb42d2a7dec3d889df7cdace.zip
op-kernel-dev-e2186023f2d81ee7bb42d2a7dec3d889df7cdace.tar.gz
powerpc/powernv: Add support for POWER8 split core on powernv
Upcoming POWER8 chips support a concept called split core. This is where the core can be split into subcores that although not full cores, are able to appear as full cores to a guest. The splitting & unsplitting procedure is mildly complicated, and explained at length in the comments within the patch. One notable detail is that when splitting or unsplitting we need to pull offline cpus out of their offline state to do work as part of the procedure. The interface for changing the split mode is via a sysfs file, eg: $ echo 2 > /sys/devices/system/cpu/subcores_per_core Currently supported values are '1', '2' and '4'. And indicate respectively that the core should be unsplit, split in half, and split in quarters. These modes correspond to threads_per_subcore of 8, 4 and 2. We do not allow changing the split mode while KVM VMs are active. This is to prevent the value changing while userspace is configuring the VM, and also to prevent the mode being changed in such a way that existing guests are unable to be run. CPU hotplug fixes by Srivatsa. max_cpus fixes by Mahesh. cpuset fixes by benh. Fix for irq race by paulus. The rest by mikey and mpe. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/powernv/Makefile')
-rw-r--r--arch/powerpc/platforms/powernv/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 63cebb9..4ad0d34 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -1,7 +1,7 @@
obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o opal-async.o
obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
-obj-y += opal-msglog.o
+obj-y += opal-msglog.o subcore.o subcore-asm.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
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