1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2013 - Virtual Open Systems
4  * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
5  */
6 
7 #ifndef VFIO_PLATFORM_PRIVATE_H
8 #define VFIO_PLATFORM_PRIVATE_H
9 
10 #include <linux/types.h>
11 #include <linux/interrupt.h>
12 #include <linux/vfio.h>
13 
14 #define VFIO_PLATFORM_OFFSET_SHIFT   40
15 #define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1)
16 
17 #define VFIO_PLATFORM_OFFSET_TO_INDEX(off)	\
18 	(off >> VFIO_PLATFORM_OFFSET_SHIFT)
19 
20 #define VFIO_PLATFORM_INDEX_TO_OFFSET(index)	\
21 	((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
22 
23 struct vfio_platform_irq {
24 	u32			flags;
25 	u32			count;
26 	int			hwirq;
27 	char			*name;
28 	struct eventfd_ctx	*trigger;
29 	bool			masked;
30 	spinlock_t		lock;
31 	struct virqfd		*unmask;
32 	struct virqfd		*mask;
33 };
34 
35 struct vfio_platform_region {
36 	u64			addr;
37 	resource_size_t		size;
38 	u32			flags;
39 	u32			type;
40 #define VFIO_PLATFORM_REGION_TYPE_MMIO	1
41 #define VFIO_PLATFORM_REGION_TYPE_PIO	2
42 	void __iomem		*ioaddr;
43 };
44 
45 struct vfio_platform_device {
46 	struct vfio_device		vdev;
47 	struct vfio_platform_region	*regions;
48 	u32				num_regions;
49 	struct vfio_platform_irq	*irqs;
50 	u32				num_irqs;
51 	struct mutex			igate;
52 	const char			*compat;
53 	const char			*acpihid;
54 	struct module			*reset_module;
55 	struct device			*device;
56 
57 	/*
58 	 * These fields should be filled by the bus specific binder
59 	 */
60 	void		*opaque;
61 	const char	*name;
62 	uint32_t	flags;
63 	/* callbacks to discover device resources */
64 	struct resource*
65 		(*get_resource)(struct vfio_platform_device *vdev, int i);
66 	int	(*get_irq)(struct vfio_platform_device *vdev, int i);
67 	int	(*of_reset)(struct vfio_platform_device *vdev);
68 
69 	bool				reset_required;
70 };
71 
72 typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev);
73 
74 struct vfio_platform_reset_node {
75 	struct list_head link;
76 	char *compat;
77 	struct module *owner;
78 	vfio_platform_reset_fn_t of_reset;
79 };
80 
81 extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
82 				      struct device *dev);
83 void vfio_platform_remove_common(struct vfio_platform_device *vdev);
84 
85 extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
86 extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
87 
88 extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
89 					uint32_t flags, unsigned index,
90 					unsigned start, unsigned count,
91 					void *data);
92 
93 extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n);
94 extern void vfio_platform_unregister_reset(const char *compat,
95 					   vfio_platform_reset_fn_t fn);
96 #define vfio_platform_register_reset(__compat, __reset)		\
97 static struct vfio_platform_reset_node __reset ## _node = {	\
98 	.owner = THIS_MODULE,					\
99 	.compat = __compat,					\
100 	.of_reset = __reset,					\
101 };								\
102 __vfio_platform_register_reset(&__reset ## _node)
103 
104 #define module_vfio_reset_handler(compat, reset)		\
105 MODULE_ALIAS("vfio-reset:" compat);				\
106 static int __init reset ## _module_init(void)			\
107 {								\
108 	vfio_platform_register_reset(compat, reset);		\
109 	return 0;						\
110 };								\
111 static void __exit reset ## _module_exit(void)			\
112 {								\
113 	vfio_platform_unregister_reset(compat, reset);		\
114 };								\
115 module_init(reset ## _module_init);				\
116 module_exit(reset ## _module_exit)
117 
118 #endif /* VFIO_PLATFORM_PRIVATE_H */
119