linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _VDUSE_H_
3 #define _VDUSE_H_
4
5 #include <linux/types.h>
6
7 #define VDUSE_BASE 0x81
8
9 /* The ioctls for control device (/dev/vduse/control) */
10
11 #define VDUSE_API_VERSION 0
12
13 /*
14 * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
15 * This is used for future extension.
16 */
17 #define VDUSE_GET_API_VERSION _IOR(VDUSE_BASE, 0x00, __u64)
18
19 /* Set the version of VDUSE API that userspace supported. */
20 #define VDUSE_SET_API_VERSION _IOW(VDUSE_BASE, 0x01, __u64)
21
22 /**
23 * struct vduse_dev_config - basic configuration of a VDUSE device
24 * @name: VDUSE device name, needs to be NUL terminated
25 * @vendor_id: virtio vendor id
26 * @device_id: virtio device id
27 * @features: virtio features
28 * @vq_num: the number of virtqueues
29 * @vq_align: the allocation alignment of virtqueue's metadata
30 * @reserved: for future use, needs to be initialized to zero
31 * @config_size: the size of the configuration space
32 * @config: the buffer of the configuration space
33 *
34 * Structure used by VDUSE_CREATE_DEV ioctl to create VDUSE device.
35 */
36 struct vduse_dev_config {
37 #define VDUSE_NAME_MAX 256
38 char name[VDUSE_NAME_MAX];
39 __u32 vendor_id;
40 __u32 device_id;
41 __u64 features;
42 __u32 vq_num;
43 __u32 vq_align;
44 __u32 reserved[13];
45 __u32 config_size;
46 __u8 config[];
47 };
48
49 /* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */
50 #define VDUSE_CREATE_DEV _IOW(VDUSE_BASE, 0x02, struct vduse_dev_config)
51
52 /*
53 * Destroy a VDUSE device. Make sure there are no more references
54 * to the char device (/dev/vduse/$NAME).
55 */
56 #define VDUSE_DESTROY_DEV _IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX])
57
58 /* The ioctls for VDUSE device (/dev/vduse/$NAME) */
59
60 /**
61 * struct vduse_iotlb_entry - entry of IOTLB to describe one IOVA region [start, last]
62 * @offset: the mmap offset on returned file descriptor
63 * @start: start of the IOVA region
64 * @last: last of the IOVA region
65 * @perm: access permission of the IOVA region
66 *
67 * Structure used by VDUSE_IOTLB_GET_FD ioctl to find an overlapped IOVA region.
68 */
69 struct vduse_iotlb_entry {
70 __u64 offset;
71 __u64 start;
72 __u64 last;
73 #define VDUSE_ACCESS_RO 0x1
74 #define VDUSE_ACCESS_WO 0x2
75 #define VDUSE_ACCESS_RW 0x3
76 __u8 perm;
77 };
78
79 /*
80 * Find the first IOVA region that overlaps with the range [start, last]
81 * and return the corresponding file descriptor. Return -EINVAL means the
82 * IOVA region doesn't exist. Caller should set start and last fields.
83 */
84 #define VDUSE_IOTLB_GET_FD _IOWR(VDUSE_BASE, 0x10, struct vduse_iotlb_entry)
85
86 /*
87 * Get the negotiated virtio features. It's a subset of the features in
88 * struct vduse_dev_config which can be accepted by virtio driver. It's
89 * only valid after FEATURES_OK status bit is set.
90 */
91 #define VDUSE_DEV_GET_FEATURES _IOR(VDUSE_BASE, 0x11, __u64)
92
93 /**
94 * struct vduse_config_data - data used to update configuration space
95 * @offset: the offset from the beginning of configuration space
96 * @length: the length to write to configuration space
97 * @buffer: the buffer used to write from
98 *
99 * Structure used by VDUSE_DEV_SET_CONFIG ioctl to update device
100 * configuration space.
101 */
102 struct vduse_config_data {
103 __u32 offset;
104 __u32 length;
105 __u8 buffer[];
106 };
107
108 /* Set device configuration space */
109 #define VDUSE_DEV_SET_CONFIG _IOW(VDUSE_BASE, 0x12, struct vduse_config_data)
110
111 /*
112 * Inject a config interrupt. It's usually used to notify virtio driver
113 * that device configuration space has changed.
114 */
115 #define VDUSE_DEV_INJECT_CONFIG_IRQ _IO(VDUSE_BASE, 0x13)
116
117 /**
118 * struct vduse_vq_config - basic configuration of a virtqueue
119 * @index: virtqueue index
120 * @max_size: the max size of virtqueue
121 * @reserved: for future use, needs to be initialized to zero
122 *
123 * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue.
124 */
125 struct vduse_vq_config {
126 __u32 index;
127 __u16 max_size;
128 __u16 reserved[13];
129 };
130
131 /*
132 * Setup the specified virtqueue. Make sure all virtqueues have been
133 * configured before the device is attached to vDPA bus.
134 */
135 #define VDUSE_VQ_SETUP _IOW(VDUSE_BASE, 0x14, struct vduse_vq_config)
136
137 /**
138 * struct vduse_vq_state_split - split virtqueue state
139 * @avail_index: available index
140 */
141 struct vduse_vq_state_split {
142 __u16 avail_index;
143 };
144
145 /**
146 * struct vduse_vq_state_packed - packed virtqueue state
147 * @last_avail_counter: last driver ring wrap counter observed by device
148 * @last_avail_idx: device available index
149 * @last_used_counter: device ring wrap counter
150 * @last_used_idx: used index
151 */
152 struct vduse_vq_state_packed {
153 __u16 last_avail_counter;
154 __u16 last_avail_idx;
155 __u16 last_used_counter;
156 __u16 last_used_idx;
157 };
158
159 /**
160 * struct vduse_vq_info - information of a virtqueue
161 * @index: virtqueue index
162 * @num: the size of virtqueue
163 * @desc_addr: address of desc area
164 * @driver_addr: address of driver area
165 * @device_addr: address of device area
166 * @split: split virtqueue state
167 * @packed: packed virtqueue state
168 * @ready: ready status of virtqueue
169 *
170 * Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information.
171 */
172 struct vduse_vq_info {
173 __u32 index;
174 __u32 num;
175 __u64 desc_addr;
176 __u64 driver_addr;
177 __u64 device_addr;
178 union {
179 struct vduse_vq_state_split split;
180 struct vduse_vq_state_packed packed;
181 };
182 __u8 ready;
183 };
184
185 /* Get the specified virtqueue's information. Caller should set index field. */
186 #define VDUSE_VQ_GET_INFO _IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info)
187
188 /**
189 * struct vduse_vq_eventfd - eventfd configuration for a virtqueue
190 * @index: virtqueue index
191 * @fd: eventfd, -1 means de-assigning the eventfd
192 *
193 * Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd.
194 */
195 struct vduse_vq_eventfd {
196 __u32 index;
197 #define VDUSE_EVENTFD_DEASSIGN -1
198 int fd;
199 };
200
201 /*
202 * Setup kick eventfd for specified virtqueue. The kick eventfd is used
203 * by VDUSE kernel module to notify userspace to consume the avail vring.
204 */
205 #define VDUSE_VQ_SETUP_KICKFD _IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd)
206
207 /*
208 * Inject an interrupt for specific virtqueue. It's used to notify virtio driver
209 * to consume the used vring.
210 */
211 #define VDUSE_VQ_INJECT_IRQ _IOW(VDUSE_BASE, 0x17, __u32)
212
213 /**
214 * struct vduse_iova_umem - userspace memory configuration for one IOVA region
215 * @uaddr: start address of userspace memory, it must be aligned to page size
216 * @iova: start of the IOVA region
217 * @size: size of the IOVA region
218 * @reserved: for future use, needs to be initialized to zero
219 *
220 * Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM
221 * ioctls to register/de-register userspace memory for IOVA regions
222 */
223 struct vduse_iova_umem {
224 __u64 uaddr;
225 __u64 iova;
226 __u64 size;
227 __u64 reserved[3];
228 };
229
230 /* Register userspace memory for IOVA regions */
231 #define VDUSE_IOTLB_REG_UMEM _IOW(VDUSE_BASE, 0x18, struct vduse_iova_umem)
232
233 /* De-register the userspace memory. Caller should set iova and size field. */
234 #define VDUSE_IOTLB_DEREG_UMEM _IOW(VDUSE_BASE, 0x19, struct vduse_iova_umem)
235
236 /**
237 * struct vduse_iova_info - information of one IOVA region
238 * @start: start of the IOVA region
239 * @last: last of the IOVA region
240 * @capability: capability of the IOVA regsion
241 * @reserved: for future use, needs to be initialized to zero
242 *
243 * Structure used by VDUSE_IOTLB_GET_INFO ioctl to get information of
244 * one IOVA region.
245 */
246 struct vduse_iova_info {
247 __u64 start;
248 __u64 last;
249 #define VDUSE_IOVA_CAP_UMEM (1 << 0)
250 __u64 capability;
251 __u64 reserved[3];
252 };
253
254 /*
255 * Find the first IOVA region that overlaps with the range [start, last]
256 * and return some information on it. Caller should set start and last fields.
257 */
258 #define VDUSE_IOTLB_GET_INFO _IOWR(VDUSE_BASE, 0x1a, struct vduse_iova_info)
259
260 /* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */
261
262 /**
263 * enum vduse_req_type - request type
264 * @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace
265 * @VDUSE_SET_STATUS: set the device status
266 * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for
267 * specified IOVA range via VDUSE_IOTLB_GET_FD ioctl
268 */
269 enum vduse_req_type {
270 VDUSE_GET_VQ_STATE,
271 VDUSE_SET_STATUS,
272 VDUSE_UPDATE_IOTLB,
273 };
274
275 /**
276 * struct vduse_vq_state - virtqueue state
277 * @index: virtqueue index
278 * @split: split virtqueue state
279 * @packed: packed virtqueue state
280 */
281 struct vduse_vq_state {
282 __u32 index;
283 union {
284 struct vduse_vq_state_split split;
285 struct vduse_vq_state_packed packed;
286 };
287 };
288
289 /**
290 * struct vduse_dev_status - device status
291 * @status: device status
292 */
293 struct vduse_dev_status {
294 __u8 status;
295 };
296
297 /**
298 * struct vduse_iova_range - IOVA range [start, last]
299 * @start: start of the IOVA range
300 * @last: last of the IOVA range
301 */
302 struct vduse_iova_range {
303 __u64 start;
304 __u64 last;
305 };
306
307 /**
308 * struct vduse_dev_request - control request
309 * @type: request type
310 * @request_id: request id
311 * @reserved: for future use
312 * @vq_state: virtqueue state, only index field is available
313 * @s: device status
314 * @iova: IOVA range for updating
315 * @padding: padding
316 *
317 * Structure used by read(2) on /dev/vduse/$NAME.
318 */
319 struct vduse_dev_request {
320 __u32 type;
321 __u32 request_id;
322 __u32 reserved[4];
323 union {
324 struct vduse_vq_state vq_state;
325 struct vduse_dev_status s;
326 struct vduse_iova_range iova;
327 __u32 padding[32];
328 };
329 };
330
331 /**
332 * struct vduse_dev_response - response to control request
333 * @request_id: corresponding request id
334 * @result: the result of request
335 * @reserved: for future use, needs to be initialized to zero
336 * @vq_state: virtqueue state
337 * @padding: padding
338 *
339 * Structure used by write(2) on /dev/vduse/$NAME.
340 */
341 struct vduse_dev_response {
342 __u32 request_id;
343 #define VDUSE_REQ_RESULT_OK 0x00
344 #define VDUSE_REQ_RESULT_FAILED 0x01
345 __u32 result;
346 __u32 reserved[4];
347 union {
348 struct vduse_vq_state vq_state;
349 __u32 padding[32];
350 };
351 };
352
353 #endif /* _VDUSE_H_ */
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