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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>
This commit is contained in:
Vijay Kumar 2017-02-01 11:34:38 -08:00 committed by David S. Miller
parent cffb3e7681
commit 7dd4fcf5b7
3 changed files with 15 additions and 2 deletions
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5
arch/sparc/include/asm/setup.h
View File

@ -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;

6
arch/sparc/kernel/smp_64.c
View File

@ -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);

6
drivers/tty/serial/sunhv.c
View File

@ -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