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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>
This commit is contained in:
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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arch/powerpc/include/asm/smp.h
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@@ -128,6 +128,7 @@ extern const char *smp_ipi_name[];
extern void smp_muxed_ipi_message_pass(int cpu, int msg);
extern void smp_muxed_ipi_set_message(int cpu, int msg);
extern irqreturn_t smp_ipi_demux(void);
extern irqreturn_t smp_ipi_demux_relaxed(void);
void smp_init_pSeries(void);
void smp_init_cell(void);