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1 | /* |
2 | * VFIO API definition | |
3 | * | |
4 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
5 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #ifndef VFIO_H | |
12 | #define VFIO_H | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/ioctl.h> | |
16 | ||
17 | #define VFIO_API_VERSION 0 | |
18 | ||
19 | #ifdef __KERNEL__ /* Internal VFIO-core/bus driver API */ | |
20 | ||
21 | #include <linux/iommu.h> | |
22 | #include <linux/mm.h> | |
23 | ||
24 | /** | |
25 | * struct vfio_device_ops - VFIO bus driver device callbacks | |
26 | * | |
27 | * @open: Called when userspace creates new file descriptor for device | |
28 | * @release: Called when userspace releases file descriptor for device | |
29 | * @read: Perform read(2) on device file descriptor | |
30 | * @write: Perform write(2) on device file descriptor | |
31 | * @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_* | |
32 | * operations documented below | |
33 | * @mmap: Perform mmap(2) on a region of the device file descriptor | |
34 | */ | |
35 | struct vfio_device_ops { | |
36 | char *name; | |
37 | int (*open)(void *device_data); | |
38 | void (*release)(void *device_data); | |
39 | ssize_t (*read)(void *device_data, char __user *buf, | |
40 | size_t count, loff_t *ppos); | |
41 | ssize_t (*write)(void *device_data, const char __user *buf, | |
42 | size_t count, loff_t *size); | |
43 | long (*ioctl)(void *device_data, unsigned int cmd, | |
44 | unsigned long arg); | |
45 | int (*mmap)(void *device_data, struct vm_area_struct *vma); | |
46 | }; | |
47 | ||
48 | extern int vfio_add_group_dev(struct device *dev, | |
49 | const struct vfio_device_ops *ops, | |
50 | void *device_data); | |
51 | ||
52 | extern void *vfio_del_group_dev(struct device *dev); | |
53 | ||
54 | /** | |
55 | * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks | |
56 | */ | |
57 | struct vfio_iommu_driver_ops { | |
58 | char *name; | |
59 | struct module *owner; | |
60 | void *(*open)(unsigned long arg); | |
61 | void (*release)(void *iommu_data); | |
62 | ssize_t (*read)(void *iommu_data, char __user *buf, | |
63 | size_t count, loff_t *ppos); | |
64 | ssize_t (*write)(void *iommu_data, const char __user *buf, | |
65 | size_t count, loff_t *size); | |
66 | long (*ioctl)(void *iommu_data, unsigned int cmd, | |
67 | unsigned long arg); | |
68 | int (*mmap)(void *iommu_data, struct vm_area_struct *vma); | |
69 | int (*attach_group)(void *iommu_data, | |
70 | struct iommu_group *group); | |
71 | void (*detach_group)(void *iommu_data, | |
72 | struct iommu_group *group); | |
73 | ||
74 | }; | |
75 | ||
76 | extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops); | |
77 | ||
78 | extern void vfio_unregister_iommu_driver( | |
79 | const struct vfio_iommu_driver_ops *ops); | |
80 | ||
81 | /** | |
82 | * offsetofend(TYPE, MEMBER) | |
83 | * | |
84 | * @TYPE: The type of the structure | |
85 | * @MEMBER: The member within the structure to get the end offset of | |
86 | * | |
87 | * Simple helper macro for dealing with variable sized structures passed | |
88 | * from user space. This allows us to easily determine if the provided | |
89 | * structure is sized to include various fields. | |
90 | */ | |
91 | #define offsetofend(TYPE, MEMBER) ({ \ | |
92 | TYPE tmp; \ | |
93 | offsetof(TYPE, MEMBER) + sizeof(tmp.MEMBER); }) \ | |
94 | ||
95 | #endif /* __KERNEL__ */ | |
96 | ||
97 | /* Kernel & User level defines for VFIO IOCTLs. */ | |
98 | ||
99 | /* Extensions */ | |
100 | ||
101 | /* None yet */ | |
102 | ||
103 | /* | |
104 | * The IOCTL interface is designed for extensibility by embedding the | |
105 | * structure length (argsz) and flags into structures passed between | |
106 | * kernel and userspace. We therefore use the _IO() macro for these | |
107 | * defines to avoid implicitly embedding a size into the ioctl request. | |
108 | * As structure fields are added, argsz will increase to match and flag | |
109 | * bits will be defined to indicate additional fields with valid data. | |
110 | * It's *always* the caller's responsibility to indicate the size of | |
111 | * the structure passed by setting argsz appropriately. | |
112 | */ | |
113 | ||
114 | #define VFIO_TYPE (';') | |
115 | #define VFIO_BASE 100 | |
116 | ||
117 | /* -------- IOCTLs for VFIO file descriptor (/dev/vfio/vfio) -------- */ | |
118 | ||
119 | /** | |
120 | * VFIO_GET_API_VERSION - _IO(VFIO_TYPE, VFIO_BASE + 0) | |
121 | * | |
122 | * Report the version of the VFIO API. This allows us to bump the entire | |
123 | * API version should we later need to add or change features in incompatible | |
124 | * ways. | |
125 | * Return: VFIO_API_VERSION | |
126 | * Availability: Always | |
127 | */ | |
128 | #define VFIO_GET_API_VERSION _IO(VFIO_TYPE, VFIO_BASE + 0) | |
129 | ||
130 | /** | |
131 | * VFIO_CHECK_EXTENSION - _IOW(VFIO_TYPE, VFIO_BASE + 1, __u32) | |
132 | * | |
133 | * Check whether an extension is supported. | |
134 | * Return: 0 if not supported, 1 (or some other positive integer) if supported. | |
135 | * Availability: Always | |
136 | */ | |
137 | #define VFIO_CHECK_EXTENSION _IO(VFIO_TYPE, VFIO_BASE + 1) | |
138 | ||
139 | /** | |
140 | * VFIO_SET_IOMMU - _IOW(VFIO_TYPE, VFIO_BASE + 2, __s32) | |
141 | * | |
142 | * Set the iommu to the given type. The type must be supported by an | |
143 | * iommu driver as verified by calling CHECK_EXTENSION using the same | |
144 | * type. A group must be set to this file descriptor before this | |
145 | * ioctl is available. The IOMMU interfaces enabled by this call are | |
146 | * specific to the value set. | |
147 | * Return: 0 on success, -errno on failure | |
148 | * Availability: When VFIO group attached | |
149 | */ | |
150 | #define VFIO_SET_IOMMU _IO(VFIO_TYPE, VFIO_BASE + 2) | |
151 | ||
152 | /* -------- IOCTLs for GROUP file descriptors (/dev/vfio/$GROUP) -------- */ | |
153 | ||
154 | /** | |
155 | * VFIO_GROUP_GET_STATUS - _IOR(VFIO_TYPE, VFIO_BASE + 3, | |
156 | * struct vfio_group_status) | |
157 | * | |
158 | * Retrieve information about the group. Fills in provided | |
159 | * struct vfio_group_info. Caller sets argsz. | |
160 | * Return: 0 on succes, -errno on failure. | |
161 | * Availability: Always | |
162 | */ | |
163 | struct vfio_group_status { | |
164 | __u32 argsz; | |
165 | __u32 flags; | |
166 | #define VFIO_GROUP_FLAGS_VIABLE (1 << 0) | |
167 | #define VFIO_GROUP_FLAGS_CONTAINER_SET (1 << 1) | |
168 | }; | |
169 | #define VFIO_GROUP_GET_STATUS _IO(VFIO_TYPE, VFIO_BASE + 3) | |
170 | ||
171 | /** | |
172 | * VFIO_GROUP_SET_CONTAINER - _IOW(VFIO_TYPE, VFIO_BASE + 4, __s32) | |
173 | * | |
174 | * Set the container for the VFIO group to the open VFIO file | |
175 | * descriptor provided. Groups may only belong to a single | |
176 | * container. Containers may, at their discretion, support multiple | |
177 | * groups. Only when a container is set are all of the interfaces | |
178 | * of the VFIO file descriptor and the VFIO group file descriptor | |
179 | * available to the user. | |
180 | * Return: 0 on success, -errno on failure. | |
181 | * Availability: Always | |
182 | */ | |
183 | #define VFIO_GROUP_SET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 4) | |
184 | ||
185 | /** | |
186 | * VFIO_GROUP_UNSET_CONTAINER - _IO(VFIO_TYPE, VFIO_BASE + 5) | |
187 | * | |
188 | * Remove the group from the attached container. This is the | |
189 | * opposite of the SET_CONTAINER call and returns the group to | |
190 | * an initial state. All device file descriptors must be released | |
191 | * prior to calling this interface. When removing the last group | |
192 | * from a container, the IOMMU will be disabled and all state lost, | |
193 | * effectively also returning the VFIO file descriptor to an initial | |
194 | * state. | |
195 | * Return: 0 on success, -errno on failure. | |
196 | * Availability: When attached to container | |
197 | */ | |
198 | #define VFIO_GROUP_UNSET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 5) | |
199 | ||
200 | /** | |
201 | * VFIO_GROUP_GET_DEVICE_FD - _IOW(VFIO_TYPE, VFIO_BASE + 6, char) | |
202 | * | |
203 | * Return a new file descriptor for the device object described by | |
204 | * the provided string. The string should match a device listed in | |
205 | * the devices subdirectory of the IOMMU group sysfs entry. The | |
206 | * group containing the device must already be added to this context. | |
207 | * Return: new file descriptor on success, -errno on failure. | |
208 | * Availability: When attached to container | |
209 | */ | |
210 | #define VFIO_GROUP_GET_DEVICE_FD _IO(VFIO_TYPE, VFIO_BASE + 6) | |
211 | ||
212 | /* --------------- IOCTLs for DEVICE file descriptors --------------- */ | |
213 | ||
214 | /** | |
215 | * VFIO_DEVICE_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 7, | |
216 | * struct vfio_device_info) | |
217 | * | |
218 | * Retrieve information about the device. Fills in provided | |
219 | * struct vfio_device_info. Caller sets argsz. | |
220 | * Return: 0 on success, -errno on failure. | |
221 | */ | |
222 | struct vfio_device_info { | |
223 | __u32 argsz; | |
224 | __u32 flags; | |
225 | #define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */ | |
226 | __u32 num_regions; /* Max region index + 1 */ | |
227 | __u32 num_irqs; /* Max IRQ index + 1 */ | |
228 | }; | |
229 | #define VFIO_DEVICE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 7) | |
230 | ||
231 | /** | |
232 | * VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8, | |
233 | * struct vfio_region_info) | |
234 | * | |
235 | * Retrieve information about a device region. Caller provides | |
236 | * struct vfio_region_info with index value set. Caller sets argsz. | |
237 | * Implementation of region mapping is bus driver specific. This is | |
238 | * intended to describe MMIO, I/O port, as well as bus specific | |
239 | * regions (ex. PCI config space). Zero sized regions may be used | |
240 | * to describe unimplemented regions (ex. unimplemented PCI BARs). | |
241 | * Return: 0 on success, -errno on failure. | |
242 | */ | |
243 | struct vfio_region_info { | |
244 | __u32 argsz; | |
245 | __u32 flags; | |
246 | #define VFIO_REGION_INFO_FLAG_READ (1 << 0) /* Region supports read */ | |
247 | #define VFIO_REGION_INFO_FLAG_WRITE (1 << 1) /* Region supports write */ | |
248 | #define VFIO_REGION_INFO_FLAG_MMAP (1 << 2) /* Region supports mmap */ | |
249 | __u32 index; /* Region index */ | |
250 | __u32 resv; /* Reserved for alignment */ | |
251 | __u64 size; /* Region size (bytes) */ | |
252 | __u64 offset; /* Region offset from start of device fd */ | |
253 | }; | |
254 | #define VFIO_DEVICE_GET_REGION_INFO _IO(VFIO_TYPE, VFIO_BASE + 8) | |
255 | ||
256 | /** | |
257 | * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9, | |
258 | * struct vfio_irq_info) | |
259 | * | |
260 | * Retrieve information about a device IRQ. Caller provides | |
261 | * struct vfio_irq_info with index value set. Caller sets argsz. | |
262 | * Implementation of IRQ mapping is bus driver specific. Indexes | |
263 | * using multiple IRQs are primarily intended to support MSI-like | |
264 | * interrupt blocks. Zero count irq blocks may be used to describe | |
265 | * unimplemented interrupt types. | |
266 | * | |
267 | * The EVENTFD flag indicates the interrupt index supports eventfd based | |
268 | * signaling. | |
269 | * | |
270 | * The MASKABLE flags indicates the index supports MASK and UNMASK | |
271 | * actions described below. | |
272 | * | |
273 | * AUTOMASKED indicates that after signaling, the interrupt line is | |
274 | * automatically masked by VFIO and the user needs to unmask the line | |
275 | * to receive new interrupts. This is primarily intended to distinguish | |
276 | * level triggered interrupts. | |
277 | * | |
278 | * The NORESIZE flag indicates that the interrupt lines within the index | |
279 | * are setup as a set and new subindexes cannot be enabled without first | |
280 | * disabling the entire index. This is used for interrupts like PCI MSI | |
281 | * and MSI-X where the driver may only use a subset of the available | |
282 | * indexes, but VFIO needs to enable a specific number of vectors | |
283 | * upfront. In the case of MSI-X, where the user can enable MSI-X and | |
284 | * then add and unmask vectors, it's up to userspace to make the decision | |
285 | * whether to allocate the maximum supported number of vectors or tear | |
286 | * down setup and incrementally increase the vectors as each is enabled. | |
287 | */ | |
288 | struct vfio_irq_info { | |
289 | __u32 argsz; | |
290 | __u32 flags; | |
291 | #define VFIO_IRQ_INFO_EVENTFD (1 << 0) | |
292 | #define VFIO_IRQ_INFO_MASKABLE (1 << 1) | |
293 | #define VFIO_IRQ_INFO_AUTOMASKED (1 << 2) | |
294 | #define VFIO_IRQ_INFO_NORESIZE (1 << 3) | |
295 | __u32 index; /* IRQ index */ | |
296 | __u32 count; /* Number of IRQs within this index */ | |
297 | }; | |
298 | #define VFIO_DEVICE_GET_IRQ_INFO _IO(VFIO_TYPE, VFIO_BASE + 9) | |
299 | ||
300 | /** | |
301 | * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set) | |
302 | * | |
303 | * Set signaling, masking, and unmasking of interrupts. Caller provides | |
304 | * struct vfio_irq_set with all fields set. 'start' and 'count' indicate | |
305 | * the range of subindexes being specified. | |
306 | * | |
307 | * The DATA flags specify the type of data provided. If DATA_NONE, the | |
308 | * operation performs the specified action immediately on the specified | |
309 | * interrupt(s). For example, to unmask AUTOMASKED interrupt [0,0]: | |
310 | * flags = (DATA_NONE|ACTION_UNMASK), index = 0, start = 0, count = 1. | |
311 | * | |
312 | * DATA_BOOL allows sparse support for the same on arrays of interrupts. | |
313 | * For example, to mask interrupts [0,1] and [0,3] (but not [0,2]): | |
314 | * flags = (DATA_BOOL|ACTION_MASK), index = 0, start = 1, count = 3, | |
315 | * data = {1,0,1} | |
316 | * | |
317 | * DATA_EVENTFD binds the specified ACTION to the provided __s32 eventfd. | |
318 | * A value of -1 can be used to either de-assign interrupts if already | |
319 | * assigned or skip un-assigned interrupts. For example, to set an eventfd | |
320 | * to be trigger for interrupts [0,0] and [0,2]: | |
321 | * flags = (DATA_EVENTFD|ACTION_TRIGGER), index = 0, start = 0, count = 3, | |
322 | * data = {fd1, -1, fd2} | |
323 | * If index [0,1] is previously set, two count = 1 ioctls calls would be | |
324 | * required to set [0,0] and [0,2] without changing [0,1]. | |
325 | * | |
326 | * Once a signaling mechanism is set, DATA_BOOL or DATA_NONE can be used | |
327 | * with ACTION_TRIGGER to perform kernel level interrupt loopback testing | |
328 | * from userspace (ie. simulate hardware triggering). | |
329 | * | |
330 | * Setting of an event triggering mechanism to userspace for ACTION_TRIGGER | |
331 | * enables the interrupt index for the device. Individual subindex interrupts | |
332 | * can be disabled using the -1 value for DATA_EVENTFD or the index can be | |
333 | * disabled as a whole with: flags = (DATA_NONE|ACTION_TRIGGER), count = 0. | |
334 | * | |
335 | * Note that ACTION_[UN]MASK specify user->kernel signaling (irqfds) while | |
336 | * ACTION_TRIGGER specifies kernel->user signaling. | |
337 | */ | |
338 | struct vfio_irq_set { | |
339 | __u32 argsz; | |
340 | __u32 flags; | |
341 | #define VFIO_IRQ_SET_DATA_NONE (1 << 0) /* Data not present */ | |
342 | #define VFIO_IRQ_SET_DATA_BOOL (1 << 1) /* Data is bool (u8) */ | |
343 | #define VFIO_IRQ_SET_DATA_EVENTFD (1 << 2) /* Data is eventfd (s32) */ | |
344 | #define VFIO_IRQ_SET_ACTION_MASK (1 << 3) /* Mask interrupt */ | |
345 | #define VFIO_IRQ_SET_ACTION_UNMASK (1 << 4) /* Unmask interrupt */ | |
346 | #define VFIO_IRQ_SET_ACTION_TRIGGER (1 << 5) /* Trigger interrupt */ | |
347 | __u32 index; | |
348 | __u32 start; | |
349 | __u32 count; | |
350 | __u8 data[]; | |
351 | }; | |
352 | #define VFIO_DEVICE_SET_IRQS _IO(VFIO_TYPE, VFIO_BASE + 10) | |
353 | ||
354 | #define VFIO_IRQ_SET_DATA_TYPE_MASK (VFIO_IRQ_SET_DATA_NONE | \ | |
355 | VFIO_IRQ_SET_DATA_BOOL | \ | |
356 | VFIO_IRQ_SET_DATA_EVENTFD) | |
357 | #define VFIO_IRQ_SET_ACTION_TYPE_MASK (VFIO_IRQ_SET_ACTION_MASK | \ | |
358 | VFIO_IRQ_SET_ACTION_UNMASK | \ | |
359 | VFIO_IRQ_SET_ACTION_TRIGGER) | |
360 | /** | |
361 | * VFIO_DEVICE_RESET - _IO(VFIO_TYPE, VFIO_BASE + 11) | |
362 | * | |
363 | * Reset a device. | |
364 | */ | |
365 | #define VFIO_DEVICE_RESET _IO(VFIO_TYPE, VFIO_BASE + 11) | |
366 | ||
367 | #endif /* VFIO_H */ |