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d4e58e5928
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>
28 lines
690 B
Text
28 lines
690 B
Text
config PPC_POWERNV
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depends on PPC64 && PPC_BOOK3S
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bool "IBM PowerNV (Non-Virtualized) platform support"
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select PPC_NATIVE
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select PPC_XICS
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select PPC_ICP_NATIVE
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select PPC_P7_NAP
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select PPC_PCI_CHOICE if EMBEDDED
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select EPAPR_BOOT
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select PPC_INDIRECT_PIO
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select PPC_UDBG_16550
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select PPC_SCOM
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select ARCH_RANDOM
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select CPU_FREQ
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select CPU_FREQ_GOV_PERFORMANCE
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select CPU_FREQ_GOV_POWERSAVE
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select CPU_FREQ_GOV_USERSPACE
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select CPU_FREQ_GOV_ONDEMAND
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select CPU_FREQ_GOV_CONSERVATIVE
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select PPC_DOORBELL
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default y
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config PPC_POWERNV_RTAS
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depends on PPC_POWERNV
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bool "Support for RTAS based PowerNV platforms such as BML"
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default y
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select PPC_ICS_RTAS
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select PPC_RTAS
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