vfio: Introduce vfio_set_irqs_validate_and_prepare()

Vendor driver using mediated device framework would use same mechnism to
validate and prepare IRQs. Introducing this function to reduce code
replication in multiple drivers.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index e26f7cc..15ff042 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -129,6 +129,10 @@
 extern int vfio_info_add_capability(struct vfio_info_cap *caps,
 				    int cap_type_id, void *cap_type);
 
+extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
+					      int num_irqs, int max_irq_type,
+					      size_t *data_size);
+
 struct pci_dev;
 #ifdef CONFIG_EEH
 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);