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authorAlex Williamson <alex.williamson@redhat.com>2015-02-06 23:05:07 +0100
committerAlex Williamson <alex.williamson@redhat.com>2015-02-10 20:37:47 +0100
commit13060b64b819c194909121b90b5f8dd9abb5ea4e (patch)
tree3fc90f7744d110341d191dd44fe228c70422bd69 /include
parentvfio: Tie IOMMU group reference to vfio group (diff)
downloadlinux-13060b64b819c194909121b90b5f8dd9abb5ea4e.tar.xz
linux-13060b64b819c194909121b90b5f8dd9abb5ea4e.zip
vfio: Add and use device request op for vfio bus drivers
When a request is made to unbind a device from a vfio bus driver, we need to wait for the device to become unused, ie. for userspace to release the device. However, we have a long standing TODO in the code to do something proactive to make that happen. To enable this, we add a request callback on the vfio bus driver struct, which is intended to signal the user through the vfio device interface to release the device. Instead of passively waiting for the device to become unused, we can now pester the user to give it up. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/vfio.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index d3204115f15d..2d67b8998fd8 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -26,6 +26,7 @@
* @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
* operations documented below
* @mmap: Perform mmap(2) on a region of the device file descriptor
+ * @request: Request for the bus driver to release the device
*/
struct vfio_device_ops {
char *name;
@@ -38,6 +39,7 @@ struct vfio_device_ops {
long (*ioctl)(void *device_data, unsigned int cmd,
unsigned long arg);
int (*mmap)(void *device_data, struct vm_area_struct *vma);
+ void (*request)(void *device_data, unsigned int count);
};
extern int vfio_add_group_dev(struct device *dev,