vfio: vfio_register_notifier: classify iommu notifier
Currently vfio_register_notifier assumes that there is only one
notifier chain, which is in vfio_iommu. However, the user might
also be interested in events other than vfio_iommu, for example,
vfio_group. Refactor vfio_{un}register_notifier implementation
to make it feasible.
Cc: Paolo Bonzini <[email protected]>
Cc: Xiao Guangrong <[email protected]>
Reviewed-by: Kirti Wankhede <[email protected]>
Signed-off-by: Jike Song <[email protected]>
[aw: merge with commit 816ca69ea9c7 ("vfio: Fix handling of error returned by 'vfio_group_get_from_dev()'"), remove typedef]
Signed-off-by: Alex Williamson <[email protected]>
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 15ff042..0e5201f 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -81,6 +81,7 @@ struct vfio_iommu_driver_ops {
int (*unpin_pages)(void *iommu_data,
unsigned long *user_pfn, int npage);
int (*register_notifier)(void *iommu_data,
+ unsigned long *events,
struct notifier_block *nb);
int (*unregister_notifier)(void *iommu_data,
struct notifier_block *nb);
@@ -107,12 +108,20 @@ extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
int npage);
-#define VFIO_IOMMU_NOTIFY_DMA_UNMAP (1)
+/* each type has independent events */
+enum vfio_notify_type {
+ VFIO_IOMMU_NOTIFY = 0,
+};
+
+/* events for VFIO_IOMMU_NOTIFY */
+#define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0)
extern int vfio_register_notifier(struct device *dev,
+ enum vfio_notify_type type,
+ unsigned long *required_events,
struct notifier_block *nb);
-
extern int vfio_unregister_notifier(struct device *dev,
+ enum vfio_notify_type type,
struct notifier_block *nb);
/*
