Commit | Line | Data |
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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
cba3345c AW |
2 | /* |
3 | * VFIO API definition | |
4 | * | |
5 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
6 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
cba3345c AW |
7 | */ |
8 | #ifndef VFIO_H | |
9 | #define VFIO_H | |
10 | ||
cba3345c AW |
11 | |
12 | #include <linux/iommu.h> | |
13 | #include <linux/mm.h> | |
7e992d69 AM |
14 | #include <linux/workqueue.h> |
15 | #include <linux/poll.h> | |
607ca46e | 16 | #include <uapi/linux/vfio.h> |
cba3345c | 17 | |
ba70a89f JG |
18 | struct kvm; |
19 | ||
2fd585f4 JG |
20 | /* |
21 | * VFIO devices can be placed in a set, this allows all devices to share this | |
22 | * structure and the VFIO core will provide a lock that is held around | |
23 | * open_device()/close_device() for all devices in the set. | |
24 | */ | |
25 | struct vfio_device_set { | |
26 | void *set_id; | |
27 | struct mutex lock; | |
28 | struct list_head device_list; | |
29 | unsigned int device_count; | |
30 | }; | |
31 | ||
0bfc6a4e JG |
32 | struct vfio_device { |
33 | struct device *dev; | |
34 | const struct vfio_device_ops *ops; | |
6e97eba8 YH |
35 | /* |
36 | * mig_ops is a static property of the vfio_device which must be set | |
37 | * prior to registering the vfio_device. | |
38 | */ | |
39 | const struct vfio_migration_ops *mig_ops; | |
0bfc6a4e | 40 | struct vfio_group *group; |
2fd585f4 JG |
41 | struct vfio_device_set *dev_set; |
42 | struct list_head dev_set_list; | |
8cb3d83b | 43 | unsigned int migration_flags; |
421cfe65 MR |
44 | /* Driver must reference the kvm during open_device or never touch it */ |
45 | struct kvm *kvm; | |
0bfc6a4e JG |
46 | |
47 | /* Members below here are private, not for driver use */ | |
48 | refcount_t refcount; | |
2fd585f4 | 49 | unsigned int open_count; |
0bfc6a4e JG |
50 | struct completion comp; |
51 | struct list_head group_next; | |
8cfc5b60 | 52 | struct list_head iommu_entry; |
0bfc6a4e JG |
53 | }; |
54 | ||
cba3345c AW |
55 | /** |
56 | * struct vfio_device_ops - VFIO bus driver device callbacks | |
57 | * | |
2fd585f4 JG |
58 | * @open_device: Called when the first file descriptor is opened for this device |
59 | * @close_device: Opposite of open_device | |
cba3345c AW |
60 | * @read: Perform read(2) on device file descriptor |
61 | * @write: Perform write(2) on device file descriptor | |
62 | * @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_* | |
63 | * operations documented below | |
64 | * @mmap: Perform mmap(2) on a region of the device file descriptor | |
13060b64 | 65 | * @request: Request for the bus driver to release the device |
5f3874c2 AW |
66 | * @match: Optional device name match callback (return: 0 for no-match, >0 for |
67 | * match, -errno for abort (ex. match with insufficient or incorrect | |
68 | * additional args) | |
ce4b4657 JG |
69 | * @dma_unmap: Called when userspace unmaps IOVA from the container |
70 | * this device is attached to. | |
445ad495 | 71 | * @device_feature: Optional, fill in the VFIO_DEVICE_FEATURE ioctl |
cba3345c AW |
72 | */ |
73 | struct vfio_device_ops { | |
74 | char *name; | |
2fd585f4 JG |
75 | int (*open_device)(struct vfio_device *vdev); |
76 | void (*close_device)(struct vfio_device *vdev); | |
6df62c5b | 77 | ssize_t (*read)(struct vfio_device *vdev, char __user *buf, |
cba3345c | 78 | size_t count, loff_t *ppos); |
6df62c5b | 79 | ssize_t (*write)(struct vfio_device *vdev, const char __user *buf, |
cba3345c | 80 | size_t count, loff_t *size); |
6df62c5b | 81 | long (*ioctl)(struct vfio_device *vdev, unsigned int cmd, |
cba3345c | 82 | unsigned long arg); |
6df62c5b JG |
83 | int (*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma); |
84 | void (*request)(struct vfio_device *vdev, unsigned int count); | |
85 | int (*match)(struct vfio_device *vdev, char *buf); | |
ce4b4657 | 86 | void (*dma_unmap)(struct vfio_device *vdev, u64 iova, u64 length); |
445ad495 JG |
87 | int (*device_feature)(struct vfio_device *device, u32 flags, |
88 | void __user *arg, size_t argsz); | |
6e97eba8 YH |
89 | }; |
90 | ||
91 | /** | |
92 | * @migration_set_state: Optional callback to change the migration state for | |
93 | * devices that support migration. It's mandatory for | |
94 | * VFIO_DEVICE_FEATURE_MIGRATION migration support. | |
95 | * The returned FD is used for data transfer according to the FSM | |
96 | * definition. The driver is responsible to ensure that FD reaches end | |
97 | * of stream or error whenever the migration FSM leaves a data transfer | |
98 | * state or before close_device() returns. | |
99 | * @migration_get_state: Optional callback to get the migration state for | |
100 | * devices that support migration. It's mandatory for | |
101 | * VFIO_DEVICE_FEATURE_MIGRATION migration support. | |
102 | */ | |
103 | struct vfio_migration_ops { | |
115dcec6 JG |
104 | struct file *(*migration_set_state)( |
105 | struct vfio_device *device, | |
106 | enum vfio_device_mig_state new_state); | |
107 | int (*migration_get_state)(struct vfio_device *device, | |
108 | enum vfio_device_mig_state *curr_state); | |
cba3345c AW |
109 | }; |
110 | ||
445ad495 JG |
111 | /** |
112 | * vfio_check_feature - Validate user input for the VFIO_DEVICE_FEATURE ioctl | |
113 | * @flags: Arg from the device_feature op | |
114 | * @argsz: Arg from the device_feature op | |
115 | * @supported_ops: Combination of VFIO_DEVICE_FEATURE_GET and SET the driver | |
116 | * supports | |
117 | * @minsz: Minimum data size the driver accepts | |
118 | * | |
119 | * For use in a driver's device_feature op. Checks that the inputs to the | |
120 | * VFIO_DEVICE_FEATURE ioctl are correct for the driver's feature. Returns 1 if | |
121 | * the driver should execute the get or set, otherwise the relevant | |
122 | * value should be returned. | |
123 | */ | |
124 | static inline int vfio_check_feature(u32 flags, size_t argsz, u32 supported_ops, | |
125 | size_t minsz) | |
126 | { | |
127 | if ((flags & (VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_SET)) & | |
128 | ~supported_ops) | |
129 | return -EINVAL; | |
130 | if (flags & VFIO_DEVICE_FEATURE_PROBE) | |
131 | return 0; | |
132 | /* Without PROBE one of GET or SET must be requested */ | |
133 | if (!(flags & (VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_SET))) | |
134 | return -EINVAL; | |
135 | if (argsz < minsz) | |
136 | return -EINVAL; | |
137 | return 1; | |
138 | } | |
139 | ||
0bfc6a4e | 140 | void vfio_init_group_dev(struct vfio_device *device, struct device *dev, |
1e04ec14 | 141 | const struct vfio_device_ops *ops); |
ae03c377 | 142 | void vfio_uninit_group_dev(struct vfio_device *device); |
0bfc6a4e | 143 | int vfio_register_group_dev(struct vfio_device *device); |
c68ea0d0 | 144 | int vfio_register_emulated_iommu_dev(struct vfio_device *device); |
0bfc6a4e | 145 | void vfio_unregister_group_dev(struct vfio_device *device); |
cba3345c | 146 | |
2fd585f4 JG |
147 | int vfio_assign_device_set(struct vfio_device *device, void *set_id); |
148 | ||
115dcec6 JG |
149 | int vfio_mig_get_next_state(struct vfio_device *device, |
150 | enum vfio_device_mig_state cur_fsm, | |
151 | enum vfio_device_mig_state new_fsm, | |
152 | enum vfio_device_mig_state *next_fsm); | |
153 | ||
6cdd9782 AK |
154 | /* |
155 | * External user API | |
156 | */ | |
d1877e63 AW |
157 | struct iommu_group *vfio_file_iommu_group(struct file *file); |
158 | bool vfio_file_enforced_coherent(struct file *file); | |
159 | void vfio_file_set_kvm(struct file *file, struct kvm *kvm); | |
160 | bool vfio_file_has_dev(struct file *file, struct vfio_device *device); | |
6cdd9782 | 161 | |
2169037d KW |
162 | #define VFIO_PIN_PAGES_MAX_ENTRIES (PAGE_SIZE/sizeof(unsigned long)) |
163 | ||
44abdd16 | 164 | int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova, |
34a255e6 | 165 | int npage, int prot, struct page **pages); |
44abdd16 | 166 | void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage); |
8561aa4f | 167 | int vfio_dma_rw(struct vfio_device *device, dma_addr_t iova, |
d1877e63 | 168 | void *data, size_t len, bool write); |
8d46c0cc | 169 | |
d7a8d5ed AW |
170 | /* |
171 | * Sub-module helpers | |
172 | */ | |
173 | struct vfio_info_cap { | |
174 | struct vfio_info_cap_header *buf; | |
175 | size_t size; | |
176 | }; | |
d1877e63 AW |
177 | struct vfio_info_cap_header *vfio_info_cap_add(struct vfio_info_cap *caps, |
178 | size_t size, u16 id, | |
179 | u16 version); | |
180 | void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset); | |
d7a8d5ed | 181 | |
d1877e63 AW |
182 | int vfio_info_add_capability(struct vfio_info_cap *caps, |
183 | struct vfio_info_cap_header *cap, size_t size); | |
b3c0a866 | 184 | |
d1877e63 AW |
185 | int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr, |
186 | int num_irqs, int max_irq_type, | |
187 | size_t *data_size); | |
c747f08a | 188 | |
92d18a68 | 189 | struct pci_dev; |
bb67b496 | 190 | #if IS_ENABLED(CONFIG_VFIO_SPAPR_EEH) |
d1877e63 AW |
191 | void vfio_spapr_pci_eeh_open(struct pci_dev *pdev); |
192 | void vfio_spapr_pci_eeh_release(struct pci_dev *pdev); | |
193 | long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group, unsigned int cmd, | |
194 | unsigned long arg); | |
1b69be5e | 195 | #else |
9b936c96 | 196 | static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev) |
1b69be5e | 197 | { |
1b69be5e GS |
198 | } |
199 | ||
200 | static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev) | |
201 | { | |
202 | } | |
203 | ||
204 | static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group, | |
205 | unsigned int cmd, | |
206 | unsigned long arg) | |
207 | { | |
208 | return -ENOTTY; | |
209 | } | |
bb67b496 | 210 | #endif /* CONFIG_VFIO_SPAPR_EEH */ |
7e992d69 AM |
211 | |
212 | /* | |
213 | * IRQfd - generic | |
214 | */ | |
215 | struct virqfd { | |
216 | void *opaque; | |
217 | struct eventfd_ctx *eventfd; | |
218 | int (*handler)(void *, void *); | |
219 | void (*thread)(void *, void *); | |
220 | void *data; | |
221 | struct work_struct inject; | |
ac6424b9 | 222 | wait_queue_entry_t wait; |
7e992d69 AM |
223 | poll_table pt; |
224 | struct work_struct shutdown; | |
225 | struct virqfd **pvirqfd; | |
226 | }; | |
227 | ||
d1877e63 AW |
228 | int vfio_virqfd_enable(void *opaque, int (*handler)(void *, void *), |
229 | void (*thread)(void *, void *), void *data, | |
230 | struct virqfd **pvirqfd, int fd); | |
231 | void vfio_virqfd_disable(struct virqfd **pvirqfd); | |
7e992d69 | 232 | |
cba3345c | 233 | #endif /* VFIO_H */ |