int
xpmem_alloc_seg_signal(struct xpmem_segment * seg)
{
int irq;
int vector, host_vector;
int apic_id;
/* Request irq */
irq = xpmem_request_irq(xpmem_irq_fn, (void *)seg->segid);
if (irq < 0)
return irq;
/* Get IDT vector */
vector = xpmem_irq_to_vector(irq);
if (vector < 0) {
xpmem_release_irq(irq, (void *)seg->segid);
return vector;
}
/* Get hardware IDT vector from host */
host_vector = xpmem_request_host_vector(vector);
/* Get hardware apic ID for logical cpu 0*/
apic_id = xpmem_get_host_apic_id(0);
if (apic_id < 0) {
xpmem_release_host_vector(host_vector);
xpmem_release_irq(irq, (void *)seg->segid);
return apic_id;
}
/* Save sigid in seg structure */
seg->sig.irq = irq;
seg->sig.vector = host_vector;
seg->sig.apic_id = apic_id;
return 0;
}
void
xpmem_free_seg_signal(struct xpmem_segment * seg)
{
int status = 0;
spin_lock(&(seg->lock));
if (seg->flags & XPMEM_FLAG_SIGNALLABLE) {
status = 1;
seg->flags &= ~XPMEM_FLAG_SIGNALLABLE;
}
spin_unlock(&(seg->lock));
if (status) {
/* Release host IDT vector */
xpmem_release_host_vector(seg->sig.vector);
/* Release the irq */
xpmem_release_irq(seg->sig.irq, (void *)seg->segid);
}
}
int
xpmem_free_seg_signal(struct xpmem_segment * seg)
{
int status = -1;
unsigned long flags;
spin_lock_irqsave(&(seg->lock), flags);
if (seg->flags & XPMEM_FLAG_SIGNALLABLE) {
status = 0;
seg->flags &= ~XPMEM_FLAG_SIGNALLABLE;
}
spin_unlock_irqrestore(&(seg->lock), flags);
if (status)
return status;
/* Release host IDT vector */
xpmem_release_host_vector(seg->sig.vector);
/* Release the irq */
xpmem_release_irq(seg->sig.irq, (void *)seg->segid);
return 0;
}