void
xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
{
#ifdef CONFIG_SMP
/* TODO: we need to call vcpu_up here */
if (unlikely(vector == ap_wakeup_vector)) {
/* XXX
* This should be in __cpu_up(cpu) in ia64 smpboot.c
* like x86. But don't want to modify it,
* keep it untouched.
*/
xen_smp_intr_init_early(cpu);
xen_send_ipi(cpu, vector);
/* vcpu_prepare_and_up(cpu); */
return;
}
#endif
switch (vector) {
case IA64_IPI_VECTOR:
xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
break;
case IA64_IPI_RESCHEDULE:
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
break;
case IA64_CMCP_VECTOR:
xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
break;
case IA64_CPEP_VECTOR:
xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
break;
case IA64_TIMER_VECTOR: {
/* this is used only once by check_sal_cache_flush()
at boot time */
static int used = 0;
if (!used) {
xen_send_ipi(cpu, IA64_TIMER_VECTOR);
used = 1;
break;
}
/* fallthrough */
}
default:
printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
vector);
notify_remote_via_irq(0); /* defaults to 0 irq */
break;
}
}
void
xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
{
#ifdef CONFIG_SMP
/* */
if (unlikely(vector == ap_wakeup_vector)) {
/*
*/
xen_smp_intr_init_early(cpu);
xen_send_ipi(cpu, vector);
/* */
return;
}
#endif
switch (vector) {
case IA64_IPI_VECTOR:
xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
break;
case IA64_IPI_RESCHEDULE:
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
break;
case IA64_CMCP_VECTOR:
xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
break;
case IA64_CPEP_VECTOR:
xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
break;
case IA64_TIMER_VECTOR: {
/*
*/
static int used = 0;
if (!used) {
xen_send_ipi(cpu, IA64_TIMER_VECTOR);
used = 1;
break;
}
/* */
}
default:
printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
vector);
notify_remote_via_irq(0); /* */
break;
}
}
/*
* Save l's FPU state, which may be on this processor or another processor.
* It may take some time, so we avoid disabling preemption where possible.
* Caller must know that the target LWP is stopped, otherwise this routine
* may race against it.
*/
void
fpusave_lwp(struct lwp *l, bool save)
{
struct cpu_info *oci;
struct pcb *pcb;
int s, spins, ticks;
spins = 0;
ticks = hardclock_ticks;
for (;;) {
s = splhigh();
pcb = lwp_getpcb(l);
oci = pcb->pcb_fpcpu;
if (oci == NULL) {
splx(s);
break;
}
if (oci == curcpu()) {
KASSERT(oci->ci_fpcurlwp == l);
fpusave_cpu(save);
splx(s);
break;
}
splx(s);
#ifdef XEN
if (xen_send_ipi(oci, XEN_IPI_SYNCH_FPU) != 0) {
panic("xen_send_ipi(%s, XEN_IPI_SYNCH_FPU) failed.",
cpu_name(oci));
}
#else /* XEN */
x86_send_ipi(oci, X86_IPI_SYNCH_FPU);
#endif
while (pcb->pcb_fpcpu == oci && ticks == hardclock_ticks) {
x86_pause();
spins++;
}
if (spins > 100000000) {
panic("fpusave_lwp: did not");
}
}
if (!save) {
/* Ensure we restart with a clean slate. */
l->l_md.md_flags &= ~MDL_USEDFPU;
}
}
