vfio_pci: Allow regions to add own capabilities

VFIO regions already support region capabilities with a limited set of
fields. However the subdriver might have to report to the userspace
additional bits.

This adds an add_capability() hook to vfio_pci_regops.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 9a86470..0c94204 100644 (file)
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -750,6 +750,12 @@ static long vfio_pci_ioctl(void *device_data,
                        if (ret)
                                return ret;
 
+                       if (vdev->region[i].ops->add_capability) {
+                               ret = vdev->region[i].ops->add_capability(vdev,
+                                               &vdev->region[i], &caps);
+                               if (ret)
+                                       return ret;
+                       }
                }
                }
 

diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index 86aab05..93c1738 100644 (file)
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -62,6 +62,9 @@ struct vfio_pci_regops {
        int     (*mmap)(struct vfio_pci_device *vdev,
                        struct vfio_pci_region *region,
                        struct vm_area_struct *vma);
+       int     (*add_capability)(struct vfio_pci_device *vdev,
+                                 struct vfio_pci_region *region,
+                                 struct vfio_info_cap *caps);
 };
 
 struct vfio_pci_region {