From 102c05e8dc4f75a573437e2ce50b2559f3db8d5e Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Tue, 20 Dec 2016 04:30:10 +1000 Subject: [PATCH] powerpc/pseries: Implement NMI IPI with H_SIGNAL_SYS_RESET Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/pseries/ras.c | 4 ++++ arch/powerpc/platforms/pseries/smp.c | 23 ++++++++++++++++++++++- 2 files changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c index 904a677..bb70b26 100644 --- a/arch/powerpc/platforms/pseries/ras.c +++ b/arch/powerpc/platforms/pseries/ras.c @@ -386,6 +386,10 @@ int pSeries_system_reset_exception(struct pt_regs *regs) } fwnmi_release_errinfo(); } + + if (smp_handle_nmi_ipi(regs)) + return 1; + return 0; /* need to perform reset */ } diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index 0925ac3..52ca6b3 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -189,6 +189,27 @@ static void smp_pseries_cause_ipi(int cpu) icp_ops->cause_ipi(cpu); } +static int pseries_cause_nmi_ipi(int cpu) +{ + int hwcpu; + + if (cpu == NMI_IPI_ALL_OTHERS) { + hwcpu = H_SIGNAL_SYS_RESET_ALL_OTHERS; + } else { + if (cpu < 0) { + WARN_ONCE(true, "incorrect cpu parameter %d", cpu); + return 0; + } + + hwcpu = get_hard_smp_processor_id(cpu); + } + + if (plapr_signal_sys_reset(hwcpu) == H_SUCCESS) + return 1; + + return 0; +} + static __init void pSeries_smp_probe(void) { xics_smp_probe(); @@ -202,7 +223,7 @@ static __init void pSeries_smp_probe(void) static struct smp_ops_t pseries_smp_ops = { .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ .cause_ipi = NULL, /* Filled at runtime by pSeries_smp_probe() */ - .cause_nmi_ipi = NULL, + .cause_nmi_ipi = pseries_cause_nmi_ipi, .probe = pSeries_smp_probe, .kick_cpu = smp_pSeries_kick_cpu, .setup_cpu = smp_setup_cpu, -- 2.7.4