1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
new file mode 100644
index 000000000000..a67130221151
--- /dev/null
+++ b/drivers/vfio/vfio.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
+ *     Author: Alex Williamson <alex.williamson@redhat.com>
+ */
+
+enum vfio_group_type {
+	/*
+	 * Physical device with IOMMU backing.
+	 */
+	VFIO_IOMMU,
+
+	/*
+	 * Virtual device without IOMMU backing. The VFIO core fakes up an
+	 * iommu_group as the iommu_group sysfs interface is part of the
+	 * userspace ABI.  The user of these devices must not be able to
+	 * directly trigger unmediated DMA.
+	 */
+	VFIO_EMULATED_IOMMU,
+
+	/*
+	 * Physical device without IOMMU backing. The VFIO core fakes up an
+	 * iommu_group as the iommu_group sysfs interface is part of the
+	 * userspace ABI.  Users can trigger unmediated DMA by the device,
+	 * usage is highly dangerous, requires an explicit opt-in and will
+	 * taint the kernel.
+	 */
+	VFIO_NO_IOMMU,
+};
+
+/* events for the backend driver notify callback */
+enum vfio_iommu_notify_type {
+	VFIO_IOMMU_CONTAINER_CLOSE = 0,
+};
+
+/**
+ * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
+ */
+struct vfio_iommu_driver_ops {
+	char		*name;
+	struct module	*owner;
+	void		*(*open)(unsigned long arg);
+	void		(*release)(void *iommu_data);
+	long		(*ioctl)(void *iommu_data, unsigned int cmd,
+				 unsigned long arg);
+	int		(*attach_group)(void *iommu_data,
+					struct iommu_group *group,
+					enum vfio_group_type);
+	void		(*detach_group)(void *iommu_data,
+					struct iommu_group *group);
+	int		(*pin_pages)(void *iommu_data,
+				     struct iommu_group *group,
+				     unsigned long *user_pfn,
+				     int npage, int prot,
+				     unsigned long *phys_pfn);
+	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);
+	int		(*dma_rw)(void *iommu_data, dma_addr_t user_iova,
+				  void *data, size_t count, bool write);
+	struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
+						   struct iommu_group *group);
+	void		(*notify)(void *iommu_data,
+				  enum vfio_iommu_notify_type event);
+};
+
+int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
+void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops);