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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_VDPA_H
3#define _LINUX_VDPA_H
4
5#include <linux/kernel.h>
6#include <linux/device.h>
7#include <linux/interrupt.h>
8#include <linux/virtio.h>
9#include <linux/vhost_iotlb.h>
10#include <linux/virtio_net.h>
11#include <linux/virtio_blk.h>
12#include <linux/if_ether.h>
13
14/**
15 * struct vdpa_callback - vDPA callback definition.
16 * @callback: interrupt callback function
17 * @private: the data passed to the callback function
18 * @trigger: the eventfd for the callback (Optional).
19 * When it is set, the vDPA driver must guarantee that
20 * signaling it is functional equivalent to triggering
21 * the callback. Then vDPA parent can signal it directly
22 * instead of triggering the callback.
23 */
24struct vdpa_callback {
25 irqreturn_t (*callback)(void *data);
26 void *private;
27 struct eventfd_ctx *trigger;
28};
29
30/**
31 * struct vdpa_notification_area - vDPA notification area
32 * @addr: base address of the notification area
33 * @size: size of the notification area
34 */
35struct vdpa_notification_area {
36 resource_size_t addr;
37 resource_size_t size;
38};
39
40/**
41 * struct vdpa_vq_state_split - vDPA split virtqueue state
42 * @avail_index: available index
43 */
44struct vdpa_vq_state_split {
45 u16 avail_index;
46};
47
48/**
49 * struct vdpa_vq_state_packed - vDPA packed virtqueue state
50 * @last_avail_counter: last driver ring wrap counter observed by device
51 * @last_avail_idx: device available index
52 * @last_used_counter: device ring wrap counter
53 * @last_used_idx: used index
54 */
55struct vdpa_vq_state_packed {
56 u16 last_avail_counter:1;
57 u16 last_avail_idx:15;
58 u16 last_used_counter:1;
59 u16 last_used_idx:15;
60};
61
62struct vdpa_vq_state {
63 union {
64 struct vdpa_vq_state_split split;
65 struct vdpa_vq_state_packed packed;
66 };
67};
68
69struct vdpa_mgmt_dev;
70
71/**
72 * struct vdpa_device - representation of a vDPA device
73 * @dev: underlying device
74 * @vmap: the metadata passed to upper layer to be used for mapping
75 * @driver_override: driver name to force a match; do not set directly,
76 * because core frees it; use driver_set_override() to
77 * set or clear it.
78 * @config: the configuration ops for this device.
79 * @map: the map ops for this device
80 * @cf_lock: Protects get and set access to configuration layout.
81 * @index: device index
82 * @features_valid: were features initialized? for legacy guests
83 * @ngroups: the number of virtqueue groups
84 * @nas: the number of address spaces
85 * @use_va: indicate whether virtual address must be used by this device
86 * @nvqs: maximum number of supported virtqueues
87 * @mdev: management device pointer; caller must setup when registering device as part
88 * of dev_add() mgmtdev ops callback before invoking _vdpa_register_device().
89 */
90struct vdpa_device {
91 struct device dev;
92 union virtio_map vmap;
93 const char *driver_override;
94 const struct vdpa_config_ops *config;
95 const struct virtio_map_ops *map;
96 struct rw_semaphore cf_lock; /* Protects get/set config */
97 unsigned int index;
98 bool features_valid;
99 bool use_va;
100 u32 nvqs;
101 struct vdpa_mgmt_dev *mdev;
102 unsigned int ngroups;
103 unsigned int nas;
104};
105
106/**
107 * struct vdpa_iova_range - the IOVA range support by the device
108 * @first: start of the IOVA range
109 * @last: end of the IOVA range
110 */
111struct vdpa_iova_range {
112 u64 first;
113 u64 last;
114};
115
116struct vdpa_dev_set_config {
117 u64 device_features;
118 struct {
119 u8 mac[ETH_ALEN];
120 u16 mtu;
121 u16 max_vq_pairs;
122 } net;
123 u64 mask;
124};
125
126/**
127 * struct vdpa_map_file - file area for device memory mapping
128 * @file: vma->vm_file for the mapping
129 * @offset: mapping offset in the vm_file
130 */
131struct vdpa_map_file {
132 struct file *file;
133 u64 offset;
134};
135
136/**
137 * struct vdpa_config_ops - operations for configuring a vDPA device.
138 * Note: vDPA device drivers are required to implement all of the
139 * operations unless it is mentioned to be optional in the following
140 * list.
141 *
142 * @set_vq_address: Set the address of virtqueue
143 * @vdev: vdpa device
144 * @idx: virtqueue index
145 * @desc_area: address of desc area
146 * @driver_area: address of driver area
147 * @device_area: address of device area
148 * Returns integer: success (0) or error (< 0)
149 * @set_vq_num: Set the size of virtqueue
150 * @vdev: vdpa device
151 * @idx: virtqueue index
152 * @num: the size of virtqueue
153 * @kick_vq: Kick the virtqueue
154 * @vdev: vdpa device
155 * @idx: virtqueue index
156 * @kick_vq_with_data: Kick the virtqueue and supply extra data
157 * (only if VIRTIO_F_NOTIFICATION_DATA is negotiated)
158 * @vdev: vdpa device
159 * @data for split virtqueue:
160 * 16 bits vqn and 16 bits next available index.
161 * @data for packed virtqueue:
162 * 16 bits vqn, 15 least significant bits of
163 * next available index and 1 bit next_wrap.
164 * @set_vq_cb: Set the interrupt callback function for
165 * a virtqueue
166 * @vdev: vdpa device
167 * @idx: virtqueue index
168 * @cb: virtio-vdev interrupt callback structure
169 * @set_vq_ready: Set ready status for a virtqueue
170 * @vdev: vdpa device
171 * @idx: virtqueue index
172 * @ready: ready (true) not ready(false)
173 * @get_vq_ready: Get ready status for a virtqueue
174 * @vdev: vdpa device
175 * @idx: virtqueue index
176 * Returns boolean: ready (true) or not (false)
177 * @set_vq_state: Set the state for a virtqueue
178 * @vdev: vdpa device
179 * @idx: virtqueue index
180 * @state: pointer to set virtqueue state (last_avail_idx)
181 * Returns integer: success (0) or error (< 0)
182 * @get_vq_state: Get the state for a virtqueue
183 * @vdev: vdpa device
184 * @idx: virtqueue index
185 * @state: pointer to returned state (last_avail_idx)
186 * @get_vendor_vq_stats: Get the vendor statistics of a device.
187 * @vdev: vdpa device
188 * @idx: virtqueue index
189 * @msg: socket buffer holding stats message
190 * @extack: extack for reporting error messages
191 * Returns integer: success (0) or error (< 0)
192 * @get_vq_notification: Get the notification area for a virtqueue (optional)
193 * @vdev: vdpa device
194 * @idx: virtqueue index
195 * Returns the notification area
196 * @get_vq_irq: Get the irq number of a virtqueue (optional,
197 * but must implemented if require vq irq offloading)
198 * @vdev: vdpa device
199 * @idx: virtqueue index
200 * Returns int: irq number of a virtqueue,
201 * negative number if no irq assigned.
202 * @get_vq_size: Get the size of a specific virtqueue (optional)
203 * @vdev: vdpa device
204 * @idx: virtqueue index
205 * Return u16: the size of the virtqueue
206 * @get_vq_align: Get the virtqueue align requirement
207 * for the device
208 * @vdev: vdpa device
209 * Returns virtqueue algin requirement
210 * @get_vq_group: Get the group id for a specific
211 * virtqueue (optional)
212 * @vdev: vdpa device
213 * @idx: virtqueue index
214 * Returns u32: group id for this virtqueue
215 * @get_vq_desc_group: Get the group id for the descriptor table of
216 * a specific virtqueue (optional)
217 * @vdev: vdpa device
218 * @idx: virtqueue index
219 * Returns u32: group id for the descriptor table
220 * portion of this virtqueue. Could be different
221 * than the one from @get_vq_group, in which case
222 * the access to the descriptor table can be
223 * confined to a separate asid, isolating from
224 * the virtqueue's buffer address access.
225 * @get_device_features: Get virtio features supported by the device
226 * @vdev: vdpa device
227 * Returns the virtio features support by the
228 * device
229 * @get_backend_features: Get parent-specific backend features (optional)
230 * Returns the vdpa features supported by the
231 * device.
232 * @set_driver_features: Set virtio features supported by the driver
233 * @vdev: vdpa device
234 * @features: feature support by the driver
235 * Returns integer: success (0) or error (< 0)
236 * @get_driver_features: Get the virtio driver features in action
237 * @vdev: vdpa device
238 * Returns the virtio features accepted
239 * @set_config_cb: Set the config interrupt callback
240 * @vdev: vdpa device
241 * @cb: virtio-vdev interrupt callback structure
242 * @get_vq_num_max: Get the max size of virtqueue
243 * @vdev: vdpa device
244 * Returns u16: max size of virtqueue
245 * @get_vq_num_min: Get the min size of virtqueue (optional)
246 * @vdev: vdpa device
247 * Returns u16: min size of virtqueue
248 * @get_device_id: Get virtio device id
249 * @vdev: vdpa device
250 * Returns u32: virtio device id
251 * @get_vendor_id: Get id for the vendor that provides this device
252 * @vdev: vdpa device
253 * Returns u32: virtio vendor id
254 * @get_status: Get the device status
255 * @vdev: vdpa device
256 * Returns u8: virtio device status
257 * @set_status: Set the device status
258 * @vdev: vdpa device
259 * @status: virtio device status
260 * @reset: Reset device
261 * @vdev: vdpa device
262 * Returns integer: success (0) or error (< 0)
263 * @compat_reset: Reset device with compatibility quirks to
264 * accommodate older userspace. Only needed by
265 * parent driver which used to have bogus reset
266 * behaviour, and has to maintain such behaviour
267 * for compatibility with older userspace.
268 * Historically compliant driver only has to
269 * implement .reset, Historically non-compliant
270 * driver should implement both.
271 * @vdev: vdpa device
272 * @flags: compatibility quirks for reset
273 * Returns integer: success (0) or error (< 0)
274 * @suspend: Suspend the device (optional)
275 * @vdev: vdpa device
276 * Returns integer: success (0) or error (< 0)
277 * @resume: Resume the device (optional)
278 * @vdev: vdpa device
279 * Returns integer: success (0) or error (< 0)
280 * @get_config_size: Get the size of the configuration space includes
281 * fields that are conditional on feature bits.
282 * @vdev: vdpa device
283 * Returns size_t: configuration size
284 * @get_config: Read from device specific configuration space
285 * @vdev: vdpa device
286 * @offset: offset from the beginning of
287 * configuration space
288 * @buf: buffer used to read to
289 * @len: the length to read from
290 * configuration space
291 * @set_config: Write to device specific configuration space
292 * @vdev: vdpa device
293 * @offset: offset from the beginning of
294 * configuration space
295 * @buf: buffer used to write from
296 * @len: the length to write to
297 * configuration space
298 * @get_generation: Get device config generation (optional)
299 * @vdev: vdpa device
300 * Returns u32: device generation
301 * @get_iova_range: Get supported iova range (optional)
302 * @vdev: vdpa device
303 * Returns the iova range supported by
304 * the device.
305 * @set_vq_affinity: Set the affinity of virtqueue (optional)
306 * @vdev: vdpa device
307 * @idx: virtqueue index
308 * @cpu_mask: the affinity mask
309 * Returns integer: success (0) or error (< 0)
310 * @get_vq_affinity: Get the affinity of virtqueue (optional)
311 * @vdev: vdpa device
312 * @idx: virtqueue index
313 * Returns the affinity mask
314 * @set_group_asid: Set address space identifier for a
315 * virtqueue group (optional)
316 * @vdev: vdpa device
317 * @group: virtqueue group
318 * @asid: address space id for this group
319 * Returns integer: success (0) or error (< 0)
320 * @set_map: Set device memory mapping (optional)
321 * Needed for device that using device
322 * specific DMA translation (on-chip IOMMU)
323 * @vdev: vdpa device
324 * @asid: address space identifier
325 * @iotlb: vhost memory mapping to be
326 * used by the vDPA
327 * Returns integer: success (0) or error (< 0)
328 * @dma_map: Map an area of PA to IOVA (optional)
329 * Needed for device that using device
330 * specific DMA translation (on-chip IOMMU)
331 * and preferring incremental map.
332 * @vdev: vdpa device
333 * @asid: address space identifier
334 * @iova: iova to be mapped
335 * @size: size of the area
336 * @pa: physical address for the map
337 * @perm: device access permission (VHOST_MAP_XX)
338 * Returns integer: success (0) or error (< 0)
339 * @dma_unmap: Unmap an area of IOVA (optional but
340 * must be implemented with dma_map)
341 * Needed for device that using device
342 * specific DMA translation (on-chip IOMMU)
343 * and preferring incremental unmap.
344 * @vdev: vdpa device
345 * @asid: address space identifier
346 * @iova: iova to be unmapped
347 * @size: size of the area
348 * Returns integer: success (0) or error (< 0)
349 * @reset_map: Reset device memory mapping to the default
350 * state (optional)
351 * Needed for devices that are using device
352 * specific DMA translation and prefer mapping
353 * to be decoupled from the virtio life cycle,
354 * i.e. device .reset op does not reset mapping
355 * @vdev: vdpa device
356 * @asid: address space identifier
357 * Returns integer: success (0) or error (< 0)
358 * @get_vq_map: Get the map metadata for a specific
359 * virtqueue (optional)
360 * @vdev: vdpa device
361 * @idx: virtqueue index
362 * Returns map token union error (NULL)
363 * @bind_mm: Bind the device to a specific address space
364 * so the vDPA framework can use VA when this
365 * callback is implemented. (optional)
366 * @vdev: vdpa device
367 * @mm: address space to bind
368 * @unbind_mm: Unbind the device from the address space
369 * bound using the bind_mm callback. (optional)
370 * @vdev: vdpa device
371 * @free: Free resources that belongs to vDPA (optional)
372 * @vdev: vdpa device
373 */
374struct vdpa_config_ops {
375 /* Virtqueue ops */
376 int (*set_vq_address)(struct vdpa_device *vdev,
377 u16 idx, u64 desc_area, u64 driver_area,
378 u64 device_area);
379 void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num);
380 void (*kick_vq)(struct vdpa_device *vdev, u16 idx);
381 void (*kick_vq_with_data)(struct vdpa_device *vdev, u32 data);
382 void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx,
383 struct vdpa_callback *cb);
384 void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready);
385 bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx);
386 int (*set_vq_state)(struct vdpa_device *vdev, u16 idx,
387 const struct vdpa_vq_state *state);
388 int (*get_vq_state)(struct vdpa_device *vdev, u16 idx,
389 struct vdpa_vq_state *state);
390 int (*get_vendor_vq_stats)(struct vdpa_device *vdev, u16 idx,
391 struct sk_buff *msg,
392 struct netlink_ext_ack *extack);
393 struct vdpa_notification_area
394 (*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
395 /* vq irq is not expected to be changed once DRIVER_OK is set */
396 int (*get_vq_irq)(struct vdpa_device *vdev, u16 idx);
397 u16 (*get_vq_size)(struct vdpa_device *vdev, u16 idx);
398
399 /* Device ops */
400 u32 (*get_vq_align)(struct vdpa_device *vdev);
401 u32 (*get_vq_group)(struct vdpa_device *vdev, u16 idx);
402 u32 (*get_vq_desc_group)(struct vdpa_device *vdev, u16 idx);
403 u64 (*get_device_features)(struct vdpa_device *vdev);
404 u64 (*get_backend_features)(const struct vdpa_device *vdev);
405 int (*set_driver_features)(struct vdpa_device *vdev, u64 features);
406 u64 (*get_driver_features)(struct vdpa_device *vdev);
407 void (*set_config_cb)(struct vdpa_device *vdev,
408 struct vdpa_callback *cb);
409 u16 (*get_vq_num_max)(struct vdpa_device *vdev);
410 u16 (*get_vq_num_min)(struct vdpa_device *vdev);
411 u32 (*get_device_id)(struct vdpa_device *vdev);
412 u32 (*get_vendor_id)(struct vdpa_device *vdev);
413 u8 (*get_status)(struct vdpa_device *vdev);
414 void (*set_status)(struct vdpa_device *vdev, u8 status);
415 int (*reset)(struct vdpa_device *vdev);
416 int (*compat_reset)(struct vdpa_device *vdev, u32 flags);
417#define VDPA_RESET_F_CLEAN_MAP 1
418 int (*suspend)(struct vdpa_device *vdev);
419 int (*resume)(struct vdpa_device *vdev);
420 size_t (*get_config_size)(struct vdpa_device *vdev);
421 void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
422 void *buf, unsigned int len);
423 void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
424 const void *buf, unsigned int len);
425 u32 (*get_generation)(struct vdpa_device *vdev);
426 struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev);
427 int (*set_vq_affinity)(struct vdpa_device *vdev, u16 idx,
428 const struct cpumask *cpu_mask);
429 const struct cpumask *(*get_vq_affinity)(struct vdpa_device *vdev,
430 u16 idx);
431
432 /* DMA ops */
433 int (*set_map)(struct vdpa_device *vdev, unsigned int asid,
434 struct vhost_iotlb *iotlb);
435 int (*dma_map)(struct vdpa_device *vdev, unsigned int asid,
436 u64 iova, u64 size, u64 pa, u32 perm, void *opaque);
437 int (*dma_unmap)(struct vdpa_device *vdev, unsigned int asid,
438 u64 iova, u64 size);
439 int (*reset_map)(struct vdpa_device *vdev, unsigned int asid);
440 int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
441 unsigned int asid);
442 union virtio_map (*get_vq_map)(struct vdpa_device *vdev, u16 idx);
443 int (*bind_mm)(struct vdpa_device *vdev, struct mm_struct *mm);
444 void (*unbind_mm)(struct vdpa_device *vdev);
445
446 /* Free device resources */
447 void (*free)(struct vdpa_device *vdev);
448};
449
450struct vdpa_device *__vdpa_alloc_device(struct device *parent,
451 const struct vdpa_config_ops *config,
452 const struct virtio_map_ops *map,
453 unsigned int ngroups, unsigned int nas,
454 size_t size, const char *name,
455 bool use_va);
456
457/**
458 * vdpa_alloc_device - allocate and initilaize a vDPA device
459 *
460 * @dev_struct: the type of the parent structure
461 * @member: the name of struct vdpa_device within the @dev_struct
462 * @parent: the parent device
463 * @config: the bus operations that is supported by this device
464 * @map: the map operations that is supported by this device
465 * @ngroups: the number of virtqueue groups supported by this device
466 * @nas: the number of address spaces
467 * @name: name of the vdpa device
468 * @use_va: indicate whether virtual address must be used by this device
469 *
470 * Return allocated data structure or ERR_PTR upon error
471 */
472#define vdpa_alloc_device(dev_struct, member, parent, config, map, \
473 ngroups, nas, name, use_va) \
474 container_of((__vdpa_alloc_device( \
475 parent, config, map, ngroups, nas, \
476 (sizeof(dev_struct) + \
477 BUILD_BUG_ON_ZERO(offsetof( \
478 dev_struct, member))), name, use_va)), \
479 dev_struct, member)
480
481int vdpa_register_device(struct vdpa_device *vdev, u32 nvqs);
482void vdpa_unregister_device(struct vdpa_device *vdev);
483
484int _vdpa_register_device(struct vdpa_device *vdev, u32 nvqs);
485void _vdpa_unregister_device(struct vdpa_device *vdev);
486
487/**
488 * struct vdpa_driver - operations for a vDPA driver
489 * @driver: underlying device driver
490 * @probe: the function to call when a device is found. Returns 0 or -errno.
491 * @remove: the function to call when a device is removed.
492 */
493struct vdpa_driver {
494 struct device_driver driver;
495 int (*probe)(struct vdpa_device *vdev);
496 void (*remove)(struct vdpa_device *vdev);
497};
498
499#define vdpa_register_driver(drv) \
500 __vdpa_register_driver(drv, THIS_MODULE)
501int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner);
502void vdpa_unregister_driver(struct vdpa_driver *drv);
503
504#define module_vdpa_driver(__vdpa_driver) \
505 module_driver(__vdpa_driver, vdpa_register_driver, \
506 vdpa_unregister_driver)
507
508static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver)
509{
510 return container_of(driver, struct vdpa_driver, driver);
511}
512
513static inline struct vdpa_device *dev_to_vdpa(struct device *_dev)
514{
515 return container_of(_dev, struct vdpa_device, dev);
516}
517
518static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev)
519{
520 return dev_get_drvdata(dev: &vdev->dev);
521}
522
523static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data)
524{
525 dev_set_drvdata(dev: &vdev->dev, data);
526}
527
528static inline union virtio_map vdpa_get_map(struct vdpa_device *vdev)
529{
530 return vdev->vmap;
531}
532
533static inline int vdpa_reset(struct vdpa_device *vdev, u32 flags)
534{
535 const struct vdpa_config_ops *ops = vdev->config;
536 int ret;
537
538 down_write(sem: &vdev->cf_lock);
539 vdev->features_valid = false;
540 if (ops->compat_reset && flags)
541 ret = ops->compat_reset(vdev, flags);
542 else
543 ret = ops->reset(vdev);
544 up_write(sem: &vdev->cf_lock);
545 return ret;
546}
547
548static inline int vdpa_set_features_unlocked(struct vdpa_device *vdev, u64 features)
549{
550 const struct vdpa_config_ops *ops = vdev->config;
551 int ret;
552
553 vdev->features_valid = true;
554 ret = ops->set_driver_features(vdev, features);
555
556 return ret;
557}
558
559static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)
560{
561 int ret;
562
563 down_write(sem: &vdev->cf_lock);
564 ret = vdpa_set_features_unlocked(vdev, features);
565 up_write(sem: &vdev->cf_lock);
566
567 return ret;
568}
569
570void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
571 void *buf, unsigned int len);
572void vdpa_set_config(struct vdpa_device *dev, unsigned int offset,
573 const void *buf, unsigned int length);
574void vdpa_set_status(struct vdpa_device *vdev, u8 status);
575
576/**
577 * struct vdpa_mgmtdev_ops - vdpa device ops
578 * @dev_add: Add a vdpa device using alloc and register
579 * @mdev: parent device to use for device addition
580 * @name: name of the new vdpa device
581 * @config: config attributes to apply to the device under creation
582 * Driver need to add a new device using _vdpa_register_device()
583 * after fully initializing the vdpa device. Driver must return 0
584 * on success or appropriate error code.
585 * @dev_del: Remove a vdpa device using unregister
586 * @mdev: parent device to use for device removal
587 * @dev: vdpa device to remove
588 * Driver need to remove the specified device by calling
589 * _vdpa_unregister_device().
590 * @dev_set_attr: change a vdpa device's attr after it was create
591 * @mdev: parent device to use for device
592 * @dev: vdpa device structure
593 * @config:Attributes to be set for the device.
594 * The driver needs to check the mask of the structure and then set
595 * the related information to the vdpa device. The driver must return 0
596 * if set successfully.
597 */
598struct vdpa_mgmtdev_ops {
599 int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name,
600 const struct vdpa_dev_set_config *config);
601 void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev);
602 int (*dev_set_attr)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev,
603 const struct vdpa_dev_set_config *config);
604};
605
606/**
607 * struct vdpa_mgmt_dev - vdpa management device
608 * @device: Management parent device
609 * @ops: operations supported by management device
610 * @id_table: Pointer to device id table of supported ids
611 * @config_attr_mask: bit mask of attributes of type enum vdpa_attr that
612 * management device support during dev_add callback
613 * @list: list entry
614 * @supported_features: features supported by device
615 * @max_supported_vqs: maximum number of virtqueues supported by device
616 */
617struct vdpa_mgmt_dev {
618 struct device *device;
619 const struct vdpa_mgmtdev_ops *ops;
620 struct virtio_device_id *id_table;
621 u64 config_attr_mask;
622 struct list_head list;
623 u64 supported_features;
624 u32 max_supported_vqs;
625};
626
627int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev);
628void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev);
629
630#endif /* _LINUX_VDPA_H */
631

source code of linux/include/linux/vdpa.h