static int
vtpci_alloc_interrupts(struct vtpci_softc *sc, int flags, int nvqs,
struct vq_alloc_info *vq_info)
{
int i, nvectors, error;
/*
* Only allocate a vector for virtqueues that are actually
* expecting an interrupt.
*/
for (nvectors = 0, i = 0; i < nvqs; i++)
if (vq_info[i].vqai_intr != NULL)
nvectors++;
if (vtpci_disable_msix != 0 ||
sc->vtpci_flags & VIRTIO_PCI_FLAG_NO_MSIX ||
flags & VIRTIO_ALLOC_VQS_DISABLE_MSIX ||
vtpci_alloc_msix(sc, nvectors) != 0) {
/*
* Use MSI interrupts if available. Otherwise, we fallback
* to legacy interrupts.
*/
if ((sc->vtpci_flags & VIRTIO_PCI_FLAG_NO_MSI) == 0 &&
vtpci_alloc_msi(sc) == 0)
sc->vtpci_flags |= VIRTIO_PCI_FLAG_MSI;
sc->vtpci_nintr_res = 1;
}
error = vtpci_alloc_intr_resources(sc, nvqs, vq_info);
return (error);
}
static int
vtpci_setup_interrupts(struct vtpci_softc *sc, enum intr_type type)
{
int error;
type |= INTR_MPSAFE;
KASSERT(sc->vtpci_flags & VTPCI_FLAG_ITYPE_MASK,
("%s: no interrupt type selected %#x", __func__, sc->vtpci_flags));
error = vtpci_alloc_intr_resources(sc);
if (error)
return (error);
if (sc->vtpci_flags & VTPCI_FLAG_LEGACY)
error = vtpci_setup_legacy_interrupt(sc, type);
else if (sc->vtpci_flags & VTPCI_FLAG_MSI)
error = vtpci_setup_msi_interrupt(sc, type);
else
error = vtpci_setup_msix_interrupts(sc, type);
return (error);
}
