Commit d98e19cc authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[S390] smp: external call vs. emergency signal 



Use a sigp sense running to decide which signal processor order to use
for an ipi. If the target cpu is running use external call, if the target
cpu is not running use emergency signal.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 5915a873

arch/s390/kernel/head31.S

+1 −1
Original line number Diff line number Diff line
@@ -92,7 +92,7 @@ ENTRY(_stext) 
.LPG3:

# check control registers

	stctl	%c0,%c15,0(%r15)

	oi	2(%r15),0x40		# enable sigp emergency signal

	oi	2(%r15),0x60		# enable sigp emergency & external call

	oi	0(%r15),0x10		# switch on low address protection

	lctl	%c0,%c15,0(%r15)

arch/s390/kernel/head64.S

+1 −1
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ ENTRY(_stext) 
.LPG3:

# check control registers

	stctg	%c0,%c15,0(%r15)

	oi	6(%r15),0x40		# enable sigp emergency signal

	oi	6(%r15),0x60		# enable sigp emergency & external call

	oi	4(%r15),0x10		# switch on low address proctection

	lctlg	%c0,%c15,0(%r15)

arch/s390/kernel/smp.c

+11 −1
Original line number Diff line number Diff line
@@ -209,13 +209,20 @@ static void do_ext_call_interrupt(unsigned int ext_int_code, 
 */

static void smp_ext_bitcall(int cpu, int sig)

{

	int order;



	/*

	 * Set signaling bit in lowcore of target cpu and kick it

	 */

	set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);

	while (sigp(cpu, sigp_emergency_signal) == sigp_busy)

	while (1) {

		order = smp_vcpu_scheduled(cpu) ?

			sigp_external_call : sigp_emergency_signal;

		if (sigp(cpu, order) != sigp_busy)

			break;

		udelay(10);

	}

}



void arch_send_call_function_ipi_mask(const struct cpumask *mask)

{
@@ -754,6 +761,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus) 
	/* request the 0x1201 emergency signal external interrupt */

	if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)

		panic("Couldn't request external interrupt 0x1201");

	/* request the 0x1202 external call external interrupt */

	if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0)

		panic("Couldn't request external interrupt 0x1202");



	/* Reallocate current lowcore, but keep its contents. */

	lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);

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