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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/vfio.h
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@@ -1,12 +1,9 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * VFIO API definition
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  *
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  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
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  *     Author: Alex Williamson <alex.williamson@redhat.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #ifndef VFIO_H
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 #define VFIO_H
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@@ -17,6 +14,18 @@
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 #include <linux/workqueue.h>
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 #include <linux/poll.h>
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 #include <uapi/linux/vfio.h>
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+
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+struct vfio_device {
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+	struct device *dev;
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+	const struct vfio_device_ops *ops;
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+	struct vfio_group *group;
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+
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+	/* Members below here are private, not for driver use */
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+	refcount_t refcount;
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+	struct completion comp;
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+	struct list_head group_next;
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+	void *device_data;
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+};
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 /**
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  * struct vfio_device_ops - VFIO bus driver device callbacks
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@@ -29,6 +38,9 @@
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  *         operations documented below
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  * @mmap: Perform mmap(2) on a region of the device file descriptor
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  * @request: Request for the bus driver to release the device
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+ * @match: Optional device name match callback (return: 0 for no-match, >0 for
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+ *         match, -errno for abort (ex. match with insufficient or incorrect
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+ *         additional args)
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  */
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 struct vfio_device_ops {
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 	char	*name;
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@@ -42,16 +54,21 @@
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 			 unsigned long arg);
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 	int	(*mmap)(void *device_data, struct vm_area_struct *vma);
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 	void	(*request)(void *device_data, unsigned int count);
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+	int	(*match)(void *device_data, char *buf);
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 };
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 extern struct iommu_group *vfio_iommu_group_get(struct device *dev);
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 extern void vfio_iommu_group_put(struct iommu_group *group, struct device *dev);
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+void vfio_init_group_dev(struct vfio_device *device, struct device *dev,
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+			 const struct vfio_device_ops *ops, void *device_data);
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+int vfio_register_group_dev(struct vfio_device *device);
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 extern int vfio_add_group_dev(struct device *dev,
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 			      const struct vfio_device_ops *ops,
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 			      void *device_data);
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 extern void *vfio_del_group_dev(struct device *dev);
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+void vfio_unregister_group_dev(struct vfio_device *device);
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 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
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 extern void vfio_device_put(struct vfio_device *device);
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 extern void *vfio_device_data(struct vfio_device *device);
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@@ -75,7 +92,9 @@
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 					struct iommu_group *group);
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 	void		(*detach_group)(void *iommu_data,
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 					struct iommu_group *group);
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-	int		(*pin_pages)(void *iommu_data, unsigned long *user_pfn,
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+	int		(*pin_pages)(void *iommu_data,
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+				     struct iommu_group *group,
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+				     unsigned long *user_pfn,
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 				     int npage, int prot,
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 				     unsigned long *phys_pfn);
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 	int		(*unpin_pages)(void *iommu_data,
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@@ -85,6 +104,8 @@
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 					     struct notifier_block *nb);
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 	int		(*unregister_notifier)(void *iommu_data,
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 					       struct notifier_block *nb);
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+	int		(*dma_rw)(void *iommu_data, dma_addr_t user_iova,
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+				  void *data, size_t count, bool write);
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 };
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 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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@@ -97,6 +118,8 @@
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  */
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 extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
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 extern void vfio_group_put_external_user(struct vfio_group *group);
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+extern struct vfio_group *vfio_group_get_external_user_from_dev(struct device
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+								*dev);
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 extern bool vfio_external_group_match_file(struct vfio_group *group,
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 					   struct file *filep);
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 extern int vfio_external_user_iommu_id(struct vfio_group *group);
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@@ -110,6 +133,15 @@
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 extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
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 			    int npage);
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+extern int vfio_group_pin_pages(struct vfio_group *group,
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+				unsigned long *user_iova_pfn, int npage,
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+				int prot, unsigned long *phys_pfn);
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+extern int vfio_group_unpin_pages(struct vfio_group *group,
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+				  unsigned long *user_iova_pfn, int npage);
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+
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+extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova,
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+		       void *data, size_t len, bool write);
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+
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 /* each type has independent events */
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 enum vfio_notify_type {
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 	VFIO_IOMMU_NOTIFY = 0,