static irqreturn_t
xpmem_irq_fn(int irq,
void * priv_data)
{
xpmem_segid_t segid = (xpmem_segid_t)priv_data;
uint32_t sigs = xpmem_get_and_clear_host_sig_count(xpmem_irq_to_vector(irq));
uint32_t sigs_handled = 0;
uint32_t sig = 0;
for (sig = 0; sig < sigs; sig++) {
sigs_handled += (xpmem_segid_signal(segid) == 0) ? 1 : 0;
}
return (sigs_handled) ? IRQ_HANDLED : IRQ_NONE;
}
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;
}
