static int hyperv_irq_remapping_alloc(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs,
void *arg)
{
struct irq_alloc_info *info = arg;
struct irq_data *irq_data;
struct irq_desc *desc;
int ret = 0;
if (!info || info->type != X86_IRQ_ALLOC_TYPE_IOAPIC || nr_irqs > 1)
return -EINVAL;
ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
if (ret < 0)
return ret;
irq_data = irq_domain_get_irq_data(domain, virq);
if (!irq_data) {
irq_domain_free_irqs_common(domain, virq, nr_irqs);
return -EINVAL;
}
irq_data->chip = &hyperv_ir_chip;
/*
* If there is interrupt remapping function of IOMMU, setting irq
* affinity only needs to change IRTE of IOMMU. But Hyper-V doesn't
* support interrupt remapping function, setting irq affinity of IO-APIC
* interrupts still needs to change IO-APIC registers. But ioapic_
* configure_entry() will ignore value of cfg->vector and cfg->
* dest_apicid when IO-APIC's parent irq domain is not the vector
* domain.(See ioapic_configure_entry()) In order to setting vector
* and dest_apicid to IO-APIC register, IO-APIC entry pointer is saved
* in the chip_data and hyperv_irq_remapping_activate()/hyperv_ir_set_
* affinity() set vector and dest_apicid directly into IO-APIC entry.
*/
irq_data->chip_data = info->ioapic_entry;
/*
* Hypver-V IO APIC irq affinity should be in the scope of
* ioapic_max_cpumask because no irq remapping support.
*/
desc = irq_data_to_desc(irq_data);
cpumask_copy(desc->irq_common_data.affinity, &ioapic_max_cpumask);
return 0;
}
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
int virq, int nvec, msi_alloc_info_t *arg)
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
struct msi_desc *desc;
int ret = 0;
for_each_msi_entry(desc, dev) {
/* Don't even try the multi-MSI brain damage. */
if (WARN_ON(!desc->irq || desc->nvec_used != 1)) {
ret = -EINVAL;
break;
}
if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
continue;
ops->set_desc(arg, desc);
/* Assumes the domain mutex is held! */
ret = irq_domain_alloc_irqs_hierarchy(domain, desc->irq, 1,
arg);
if (ret)
break;
irq_set_msi_desc_off(desc->irq, 0, desc);
}
if (ret) {
/* Mop up the damage */
for_each_msi_entry(desc, dev) {
if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
continue;
irq_domain_free_irqs_common(domain, desc->irq, 1);
}
}
return ret;
}
static void hyperv_irq_remapping_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
irq_domain_free_irqs_common(domain, virq, nr_irqs);
}
