Function intr_alloc_msix

freebsd/kern/subr_intr.c:1411–1447

}

int
intr_alloc_msix(device_t pci, device_t child, intptr_t xref, int *irq)
{
	struct iommu_domain *domain;
	struct intr_irqsrc *isrc;
	struct intr_pic *pic;
	device_t pdev;
	struct intr_map_data_msi *msi;
	int err;

	pic = pic_lookup(NULL, xref, FLAG_MSI);
	if (pic == NULL)
		return (ESRCH);

	KASSERT((pic->pic_flags & FLAG_TYPE_MASK) == FLAG_MSI,
	    ("%s: Found a non-MSI controller: %s", __func__,
	     device_get_name(pic->pic_dev)));

	/*
	 * If this is the first time we have used this context ask the
	 * interrupt controller to map memory the msi source will need.
	 */
	err = MSI_IOMMU_INIT(pic->pic_dev, child, &domain);
	if (err != 0)
		return (err);

	err = MSI_ALLOC_MSIX(pic->pic_dev, child, &pdev, &isrc);
	if (err != 0)
		return (err);

	isrc->isrc_iommu = domain;
	msi = (struct intr_map_data_msi *)intr_alloc_map_data(
		    INTR_MAP_DATA_MSI, sizeof(*msi), M_WAITOK | M_ZERO);
	msi->isrc = isrc;
	*irq = intr_map_irq(pic->pic_dev, xref, (struct intr_map_data *)msi);
	return (0);
}

int
intr_release_msix(device_t pci, device_t child, intptr_t xref, int irq)