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| author | Michael Neuling <mikey@neuling.org> | 2014-06-11 07:59:28 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-06-11 09:05:12 +0200 |
| commit | d4e58e5928f8c6c49228451dd03e0714cbab299a (patch) | |
| tree | 34add9a16b4dbe03da04191f51588f3f6a6bdbf9 /arch/powerpc/platforms/pseries/Kconfig | |
| parent | powerpc/cpuidle: Only clear LPCR decrementer wakeup bit on fast sleep entry (diff) | |
| download | linux-d4e58e5928f8c6c49228451dd03e0714cbab299a.tar.xz linux-d4e58e5928f8c6c49228451dd03e0714cbab299a.zip | |
powerpc/powernv: Enable POWER8 doorbell IPIs
This patch enables POWER8 doorbell IPIs on powernv.
Since doorbells can only IPI within a core, we test to see when we can use
doorbells and if not we fall back to XICS. This also enables hypervisor
doorbells to wakeup us up from nap/sleep via the LPCR PECEDH bit.
Based on tests by Anton, the best case IPI latency between two threads dropped
from 894ns to 512ns.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/Kconfig')
| -rw-r--r-- | arch/powerpc/platforms/pseries/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index 2cb8b776c84a..756b482f819a 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -21,6 +21,7 @@ config PPC_PSERIES select HAVE_CONTEXT_TRACKING select HOTPLUG_CPU if SMP select ARCH_RANDOM + select PPC_DOORBELL default y config PPC_SPLPAR |