powerpc: Add struct smp_ops_t.cause_nmi_ipi operation

Have the NMI IPI code use this op when the platform defines it.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/smp.h

@@ -42,6 +42,7 @@ struct smp_ops_t {
 #ifdef CONFIG_PPC_SMP_MUXED_IPI
 	void  (*cause_ipi)(int cpu);
 #endif
+	int   (*cause_nmi_ipi)(int cpu);
 	void  (*probe)(void);
 	int   (*kick_cpu)(int nr);
 	int   (*prepare_cpu)(int nr);

arch/powerpc/kernel/smp.c

@@ -417,6 +417,9 @@ int smp_handle_nmi_ipi(struct pt_regs *regs)
 
 static void do_smp_send_nmi_ipi(int cpu)
 {
+	if (smp_ops->cause_nmi_ipi && smp_ops->cause_nmi_ipi(cpu))
+		return;
+
 	if (cpu >= 0) {
 		do_message_pass(cpu, PPC_MSG_NMI_IPI);
 	} else {

arch/powerpc/platforms/85xx/smp.c

@@ -344,6 +344,7 @@ static int smp_85xx_kick_cpu(int nr)
 }
 
 struct smp_ops_t smp_85xx_ops = {
+	.cause_nmi_ipi = NULL,
 	.kick_cpu = smp_85xx_kick_cpu,
 	.cpu_bootable = smp_generic_cpu_bootable,
 #ifdef CONFIG_HOTPLUG_CPU

arch/powerpc/platforms/86xx/mpc86xx_smp.c

@@ -105,6 +105,7 @@ smp_86xx_setup_cpu(int cpu_nr)
 
 
 struct smp_ops_t smp_86xx_ops = {
+	.cause_nmi_ipi = NULL,
 	.message_pass = smp_mpic_message_pass,
 	.probe = smp_mpic_probe,
 	.kick_cpu = smp_86xx_kick_cpu,

arch/powerpc/platforms/chrp/smp.c

@@ -44,6 +44,7 @@ static void smp_chrp_setup_cpu(int cpu_nr)
 
 /* CHRP with openpic */
 struct smp_ops_t chrp_smp_ops = {
+	.cause_nmi_ipi = NULL,
 	.message_pass = smp_mpic_message_pass,
 	.probe = smp_mpic_probe,
 	.kick_cpu = smp_chrp_kick_cpu,

arch/powerpc/platforms/powermac/smp.c

@@ -447,6 +447,7 @@ void __init smp_psurge_give_timebase(void)
 struct smp_ops_t psurge_smp_ops = {
 	.message_pass	= NULL,	/* Use smp_muxed_ipi_message_pass */
 	.cause_ipi	= smp_psurge_cause_ipi,
+	.cause_nmi_ipi	= NULL,
 	.probe		= smp_psurge_probe,
 	.kick_cpu	= smp_psurge_kick_cpu,
 	.setup_cpu	= smp_psurge_setup_cpu,

arch/powerpc/platforms/powernv/smp.c

@@ -302,6 +302,7 @@ static void __init pnv_smp_probe(void)
 static struct smp_ops_t pnv_smp_ops = {
 	.message_pass	= NULL, /* Use smp_muxed_ipi_message_pass */
 	.cause_ipi	= NULL,	/* Filled at runtime by pnv_smp_probe() */
+	.cause_nmi_ipi	= NULL,
 	.probe		= pnv_smp_probe,
 	.prepare_cpu	= pnv_smp_prepare_cpu,
 	.kick_cpu	= pnv_smp_kick_cpu,

arch/powerpc/platforms/pseries/smp.c

@@ -202,6 +202,7 @@ 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,
 	.probe		= pSeries_smp_probe,
 	.kick_cpu	= smp_pSeries_kick_cpu,
 	.setup_cpu	= smp_setup_cpu,