powerpc: Introduce msgsnd/doorbell barrier primitives

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POWER9 changes requirements and adds new instructions for
synchronization.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2017-04-13 20:16:22 +10:00 • committed by Michael Ellerman

parent b866cc2199

commit b87ac02183

4 changed files with 36 additions and 5 deletions

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22

arch/powerpc/include/asm/dbell.h

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1

arch/powerpc/include/asm/smp.h

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8

arch/powerpc/kernel/dbell.c

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10

arch/powerpc/kernel/smp.c

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