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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-04-13 20:16:22 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-13 23:34:33 +1000 |
| commit | b87ac0218355a83abb899a0022bb2e5252879fc0 (patch) | |
| tree | 2163874a33e22901d42faeceba3b99e1d25eab05 /arch/powerpc/kernel/dbell.c | |
| parent | b866cc2199d6a6cdcefe4acfe4cfca3ac3c6d38e (diff) | |
| download | linux-next-b87ac0218355a83abb899a0022bb2e5252879fc0.tar.gz | |
powerpc: Introduce msgsnd/doorbell barrier primitives
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>
Diffstat (limited to 'arch/powerpc/kernel/dbell.c')
| -rw-r--r-- | arch/powerpc/kernel/dbell.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c index 5869c66adfd0..b6fe883b1016 100644 --- a/arch/powerpc/kernel/dbell.c +++ b/arch/powerpc/kernel/dbell.c @@ -38,7 +38,7 @@ void doorbell_global_ipi(int cpu) kvmppc_set_host_ipi(cpu, 1); /* Order previous accesses vs. msgsnd, which is treated as a store */ - mb(); + ppc_msgsnd_sync(); ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag); } @@ -53,7 +53,7 @@ void doorbell_core_ipi(int cpu) kvmppc_set_host_ipi(cpu, 1); /* Order previous accesses vs. msgsnd, which is treated as a store */ - mb(); + ppc_msgsnd_sync(); ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag); } @@ -82,12 +82,14 @@ void doorbell_exception(struct pt_regs *regs) irq_enter(); + ppc_msgsync(); + may_hard_irq_enable(); kvmppc_set_host_ipi(smp_processor_id(), 0); __this_cpu_inc(irq_stat.doorbell_irqs); - smp_ipi_demux(); + smp_ipi_demux_relaxed(); /* already performed the barrier */ irq_exit(); set_irq_regs(old_regs); |