1 /*
2 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
3 * Author: Alex Williamson <alex.williamson@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Derived from original vfio:
10 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
11 * Author: Tom Lyon, pugs@cisco.com
12 */
13
14 #include <linux/mutex.h>
15 #include <linux/pci.h>
16 #include <linux/irqbypass.h>
17 #include <linux/types.h>
18
19 #ifndef VFIO_PCI_PRIVATE_H
20 #define VFIO_PCI_PRIVATE_H
21
22 #define VFIO_PCI_OFFSET_SHIFT 40
23
24 #define VFIO_PCI_OFFSET_TO_INDEX(off) (off >> VFIO_PCI_OFFSET_SHIFT)
25 #define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
26 #define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
27
28 /* Special capability IDs predefined access */
29 #define PCI_CAP_ID_INVALID 0xFF /* default raw access */
30 #define PCI_CAP_ID_INVALID_VIRT 0xFE /* default virt access */
31
32 /* Cap maximum number of ioeventfds per device (arbitrary) */
33 #define VFIO_PCI_IOEVENTFD_MAX 1000
34
35 struct vfio_pci_ioeventfd {
36 struct list_head next;
37 struct virqfd *virqfd;
38 void __iomem *addr;
39 uint64_t data;
40 loff_t pos;
41 int bar;
42 int count;
43 };
44
45 struct vfio_pci_irq_ctx {
46 struct eventfd_ctx *trigger;
47 struct virqfd *unmask;
48 struct virqfd *mask;
49 char *name;
50 bool masked;
51 struct irq_bypass_producer producer;
52 };
53
54 struct vfio_pci_device;
55 struct vfio_pci_region;
56
57 struct vfio_pci_regops {
58 size_t (*rw)(struct vfio_pci_device *vdev, char __user *buf,
59 size_t count, loff_t *ppos, bool iswrite);
60 void (*release)(struct vfio_pci_device *vdev,
61 struct vfio_pci_region *region);
62 };
63
64 struct vfio_pci_region {
65 u32 type;
66 u32 subtype;
67 const struct vfio_pci_regops *ops;
68 void *data;
69 size_t size;
70 u32 flags;
71 };
72
73 struct vfio_pci_dummy_resource {
74 struct resource resource;
75 int index;
76 struct list_head res_next;
77 };
78
79 struct vfio_pci_device {
80 struct pci_dev *pdev;
81 void __iomem *barmap[PCI_STD_RESOURCE_END + 1];
82 bool bar_mmap_supported[PCI_STD_RESOURCE_END + 1];
83 u8 *pci_config_map;
84 u8 *vconfig;
85 struct perm_bits *msi_perm;
86 spinlock_t irqlock;
87 struct mutex igate;
88 struct vfio_pci_irq_ctx *ctx;
89 int num_ctx;
90 int irq_type;
91 int num_regions;
92 struct vfio_pci_region *region;
93 u8 msi_qmax;
94 u8 msix_bar;
95 u16 msix_size;
96 u32 msix_offset;
97 u32 rbar[7];
98 bool pci_2_3;
99 bool virq_disabled;
100 bool reset_works;
101 bool extended_caps;
102 bool bardirty;
103 bool has_vga;
104 bool needs_reset;
105 bool nointx;
106 struct pci_saved_state *pci_saved_state;
107 int refcnt;
108 int ioeventfds_nr;
109 struct eventfd_ctx *err_trigger;
110 struct eventfd_ctx *req_trigger;
111 struct list_head dummy_resources_list;
112 struct mutex ioeventfds_lock;
113 struct list_head ioeventfds_list;
114 };
115
116 #define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
117 #define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
118 #define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
119 #define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
120 #define irq_is(vdev, type) (vdev->irq_type == type)
121
122 extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
123 extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
124
125 extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
126 uint32_t flags, unsigned index,
127 unsigned start, unsigned count, void *data);
128
129 extern ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev,
130 char __user *buf, size_t count,
131 loff_t *ppos, bool iswrite);
132
133 extern ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
134 size_t count, loff_t *ppos, bool iswrite);
135
136 extern ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
137 size_t count, loff_t *ppos, bool iswrite);
138
139 extern long vfio_pci_ioeventfd(struct vfio_pci_device *vdev, loff_t offset,
140 uint64_t data, int count, int fd);
141
142 extern int vfio_pci_init_perm_bits(void);
143 extern void vfio_pci_uninit_perm_bits(void);
144
145 extern int vfio_config_init(struct vfio_pci_device *vdev);
146 extern void vfio_config_free(struct vfio_pci_device *vdev);
147
148 extern int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
149 unsigned int type, unsigned int subtype,
150 const struct vfio_pci_regops *ops,
151 size_t size, u32 flags, void *data);
152 #ifdef CONFIG_VFIO_PCI_IGD
153 extern int vfio_pci_igd_init(struct vfio_pci_device *vdev);
154 #else
vfio_pci_igd_init(struct vfio_pci_device * vdev)155 static inline int vfio_pci_igd_init(struct vfio_pci_device *vdev)
156 {
157 return -ENODEV;
158 }
159 #endif
160 #endif /* VFIO_PCI_PRIVATE_H */
161
