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authorVijay Kumar <vijay.ac.kumar@oracle.com>2017-02-01 11:34:38 -0800
committerDavid S. Miller <davem@davemloft.net>2017-02-23 08:27:24 -0800
commit7dd4fcf5b70694dc961eb6b954673e4fc9730dbd (patch)
tree4209465c2da178199e233f2f4600a36458b57047
parentcffb3e76818fee4763a2ce5f2b1eca2d7885e2cf (diff)
downloadlinux-7dd4fcf5b70694dc961eb6b954673e4fc9730dbd.tar.bz2
sparc64: Migrate hvcons irq to panicked cpu
On panic, all other CPUs are stopped except the one which had hit panic. To keep console alive, we need to migrate hvcons irq to panicked CPU. Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--arch/sparc/include/asm/setup.h5
-rw-r--r--arch/sparc/kernel/smp_64.c6
-rw-r--r--drivers/tty/serial/sunhv.c6
3 files changed, 15 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/setup.h b/arch/sparc/include/asm/setup.h
index 29d64b1758ed..478bf6bb4598 100644
--- a/arch/sparc/include/asm/setup.h
+++ b/arch/sparc/include/asm/setup.h
@@ -59,8 +59,11 @@ extern atomic_t dcpage_flushes;
extern atomic_t dcpage_flushes_xcall;
extern int sysctl_tsb_ratio;
-#endif
+#ifdef CONFIG_SERIAL_SUNHV
+void sunhv_migrate_hvcons_irq(int cpu);
+#endif
+#endif
void sun_do_break(void);
extern int stop_a_enabled;
extern int scons_pwroff;
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 712bf1b7f630..90a02cb64e20 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1452,8 +1452,12 @@ void smp_send_stop(void)
int cpu;
if (tlb_type == hypervisor) {
+ int this_cpu = smp_processor_id();
+#ifdef CONFIG_SERIAL_SUNHV
+ sunhv_migrate_hvcons_irq(this_cpu);
+#endif
for_each_online_cpu(cpu) {
- if (cpu == smp_processor_id())
+ if (cpu == this_cpu)
continue;
set_cpu_online(cpu, false);
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
index 73abd89c0108..c5ebdc8bed6a 100644
--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -398,6 +398,12 @@ static struct uart_driver sunhv_reg = {
static struct uart_port *sunhv_port;
+void sunhv_migrate_hvcons_irq(int cpu)
+{
+ /* Migrate hvcons irq to param cpu */
+ irq_force_affinity(sunhv_port->irq, cpumask_of(cpu));
+}
+
/* Copy 's' into the con_write_page, decoding "\n" into
* "\r\n" along the way. We have to return two lengths
* because the caller needs to know how much to advance