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[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: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-10-30 15:16:58 +01:00
parent 5915a873fc
commit d98e19ccef
3 changed files with 13 additions and 3 deletions
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2
arch/s390/kernel/head31.S
View File

@ -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)

2
arch/s390/kernel/head64.S
View File

@ -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)

12
arch/s390/kernel/smp.c
View File

@ -209,12 +209,19 @@ 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);