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Commit 7bf94b95 authored by Vijay Kumar's avatar Vijay Kumar Committed by Greg Kroah-Hartman
Browse files

sparc64: Migrate hvcons irq to panicked cpu 




[ Upstream commit 7dd4fcf5b70694dc961eb6b954673e4fc9730dbd ]

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: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d14591e8

arch/sparc/include/asm/setup.h

+4 −1
Original line number Diff line number Diff line
@@ -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;

arch/sparc/kernel/smp_64.c

+5 −1
Original line number Diff line number Diff line
@@ -1443,8 +1443,12 @@ 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) {

drivers/tty/serial/sunhv.c

+6 −0
Original line number Diff line number Diff line
@@ -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