vdpa.h

  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(&vdev->dev);
521}
522
523static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data)
524{
525	dev_set_drvdata(&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(&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(&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(&vdev->cf_lock);
564	ret = vdpa_set_features_unlocked(vdev, features);
565	up_write(&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 */