sparc64: Migrate hvcons irq to panicked cpu

[ Upstream commit 7dd4fcf5b7 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
master
Vijay Kumar 6 years ago committed by Greg Kroah-Hartman
parent cf368c29f5
commit 84a66ca775

@ -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;

@ -1465,8 +1465,12 @@ 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;
#ifdef CONFIG_SUN_LDOMS
if (ldom_domaining_enabled) {

@ -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

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