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-rw-r--r--arch/powerpc/kernel/smp.c46
1 files changed, 39 insertions, 7 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 9ca7148b5881a..5eadfffabe351 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -59,6 +59,7 @@
#include <asm/kexec.h>
#include <asm/asm-prototypes.h>
#include <asm/cpu_has_feature.h>
+#include <asm/ftrace.h>
#ifdef DEBUG
#include <asm/udbg.h>
@@ -155,11 +156,13 @@ static irqreturn_t reschedule_action(int irq, void *data)
return IRQ_HANDLED;
}
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
static irqreturn_t tick_broadcast_ipi_action(int irq, void *data)
{
- tick_broadcast_ipi_handler();
+ timer_broadcast_interrupt();
return IRQ_HANDLED;
}
+#endif
#ifdef CONFIG_NMI_IPI
static irqreturn_t nmi_ipi_action(int irq, void *data)
@@ -172,7 +175,9 @@ static irqreturn_t nmi_ipi_action(int irq, void *data)
static irq_handler_t smp_ipi_action[] = {
[PPC_MSG_CALL_FUNCTION] = call_function_action,
[PPC_MSG_RESCHEDULE] = reschedule_action,
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
[PPC_MSG_TICK_BROADCAST] = tick_broadcast_ipi_action,
+#endif
#ifdef CONFIG_NMI_IPI
[PPC_MSG_NMI_IPI] = nmi_ipi_action,
#endif
@@ -186,8 +191,12 @@ static irq_handler_t smp_ipi_action[] = {
const char *smp_ipi_name[] = {
[PPC_MSG_CALL_FUNCTION] = "ipi call function",
[PPC_MSG_RESCHEDULE] = "ipi reschedule",
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
[PPC_MSG_TICK_BROADCAST] = "ipi tick-broadcast",
+#endif
+#ifdef CONFIG_NMI_IPI
[PPC_MSG_NMI_IPI] = "nmi ipi",
+#endif
};
/* optional function to request ipi, for controllers with >= 4 ipis */
@@ -277,8 +286,10 @@ irqreturn_t smp_ipi_demux_relaxed(void)
generic_smp_call_function_interrupt();
if (all & IPI_MESSAGE(PPC_MSG_RESCHEDULE))
scheduler_ipi();
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
if (all & IPI_MESSAGE(PPC_MSG_TICK_BROADCAST))
- tick_broadcast_ipi_handler();
+ timer_broadcast_interrupt();
+#endif
#ifdef CONFIG_NMI_IPI
if (all & IPI_MESSAGE(PPC_MSG_NMI_IPI))
nmi_ipi_action(0, NULL);
@@ -419,9 +430,9 @@ out:
return ret;
}
-static void do_smp_send_nmi_ipi(int cpu)
+static void do_smp_send_nmi_ipi(int cpu, bool safe)
{
- if (smp_ops->cause_nmi_ipi && smp_ops->cause_nmi_ipi(cpu))
+ if (!safe && smp_ops->cause_nmi_ipi && smp_ops->cause_nmi_ipi(cpu))
return;
if (cpu >= 0) {
@@ -461,7 +472,7 @@ void smp_flush_nmi_ipi(u64 delay_us)
* - delay_us > 0 is the delay before giving up waiting for targets to
* enter the handler, == 0 specifies indefinite delay.
*/
-int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
+int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us, bool safe)
{
unsigned long flags;
int me = raw_smp_processor_id();
@@ -494,7 +505,7 @@ int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
nmi_ipi_busy_count++;
nmi_ipi_unlock();
- do_smp_send_nmi_ipi(cpu);
+ do_smp_send_nmi_ipi(cpu, safe);
while (!cpumask_empty(&nmi_ipi_pending_mask)) {
udelay(1);
@@ -516,6 +527,16 @@ int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
return ret;
}
+
+int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
+{
+ return __smp_send_nmi_ipi(cpu, fn, delay_us, false);
+}
+
+int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
+{
+ return __smp_send_nmi_ipi(cpu, fn, delay_us, true);
+}
#endif /* CONFIG_NMI_IPI */
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
@@ -559,7 +580,7 @@ void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
* entire NMI dance and waiting for
* cpus to clear pending mask, etc.
*/
- do_smp_send_nmi_ipi(cpu);
+ do_smp_send_nmi_ipi(cpu, false);
}
}
}
@@ -1066,6 +1087,9 @@ void start_secondary(void *unused)
local_irq_enable();
+ /* We can enable ftrace for secondary cpus now */
+ this_cpu_enable_ftrace();
+
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
BUG();
@@ -1162,6 +1186,8 @@ int __cpu_disable(void)
if (!smp_ops->cpu_disable)
return -ENOSYS;
+ this_cpu_disable_ftrace();
+
err = smp_ops->cpu_disable();
if (err)
return err;
@@ -1180,6 +1206,12 @@ void __cpu_die(unsigned int cpu)
void cpu_die(void)
{
+ /*
+ * Disable on the down path. This will be re-enabled by
+ * start_secondary() via start_secondary_resume() below
+ */
+ this_cpu_disable_ftrace();
+
if (ppc_md.cpu_die)
ppc_md.cpu_die();