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authorMichael Neuling <mikey@neuling.org>2014-06-11 01:59:28 -0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-06-11 03:05:12 -0400
commitd4e58e5928f8c6c49228451dd03e0714cbab299a (patch)
tree34add9a16b4dbe03da04191f51588f3f6a6bdbf9 /arch/powerpc/include/asm/ucc_slow.h
parent9b6a68d94333cf19d4ec0f2aaf9f9eb68866630e (diff)
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/include/asm/ucc_slow.h')
0 files changed, 0 insertions, 0 deletions