summaryrefslogtreecommitdiffstats
path: root/drivers/vdpa/vdpa.c
blob: 3fc4525fc05cfb91d84aa51c87e7a9cea49cf33e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
// SPDX-License-Identifier: GPL-2.0-only
/*
 * vDPA bus.
 *
 * Copyright (c) 2020, Red Hat. All rights reserved.
 *     Author: Jason Wang <jasowang@redhat.com>
 *
 */

#include <linux/module.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/vdpa.h>
#include <uapi/linux/vdpa.h>
#include <net/genetlink.h>
#include <linux/mod_devicetable.h>

static LIST_HEAD(mdev_head);
/* A global mutex that protects vdpa management device and device level operations. */
static DEFINE_MUTEX(vdpa_dev_mutex);
static DEFINE_IDA(vdpa_index_ida);

static struct genl_family vdpa_nl_family;

static int vdpa_dev_probe(struct device *d)
{
	struct vdpa_device *vdev = dev_to_vdpa(d);
	struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
	int ret = 0;

	if (drv && drv->probe)
		ret = drv->probe(vdev);

	return ret;
}

static void vdpa_dev_remove(struct device *d)
{
	struct vdpa_device *vdev = dev_to_vdpa(d);
	struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);

	if (drv && drv->remove)
		drv->remove(vdev);
}

static struct bus_type vdpa_bus = {
	.name  = "vdpa",
	.probe = vdpa_dev_probe,
	.remove = vdpa_dev_remove,
};

static void vdpa_release_dev(struct device *d)
{
	struct vdpa_device *vdev = dev_to_vdpa(d);
	const struct vdpa_config_ops *ops = vdev->config;

	if (ops->free)
		ops->free(vdev);

	ida_simple_remove(&vdpa_index_ida, vdev->index);
	kfree(vdev);
}

/**
 * __vdpa_alloc_device - allocate and initilaize a vDPA device
 * This allows driver to some prepartion after device is
 * initialized but before registered.
 * @parent: the parent device
 * @config: the bus operations that is supported by this device
 * @size: size of the parent structure that contains private data
 * @name: name of the vdpa device; optional.
 *
 * Driver should use vdpa_alloc_device() wrapper macro instead of
 * using this directly.
 *
 * Return: Returns an error when parent/config/dma_dev is not set or fail to get
 *	   ida.
 */
struct vdpa_device *__vdpa_alloc_device(struct device *parent,
					const struct vdpa_config_ops *config,
					size_t size, const char *name)
{
	struct vdpa_device *vdev;
	int err = -EINVAL;

	if (!config)
		goto err;

	if (!!config->dma_map != !!config->dma_unmap)
		goto err;

	err = -ENOMEM;
	vdev = kzalloc(size, GFP_KERNEL);
	if (!vdev)
		goto err;

	err = ida_alloc(&vdpa_index_ida, GFP_KERNEL);
	if (err < 0)
		goto err_ida;

	vdev->dev.bus = &vdpa_bus;
	vdev->dev.parent = parent;
	vdev->dev.release = vdpa_release_dev;
	vdev->index = err;
	vdev->config = config;
	vdev->features_valid = false;

	if (name)
		err = dev_set_name(&vdev->dev, "%s", name);
	else
		err = dev_set_name(&vdev->dev, "vdpa%u", vdev->index);
	if (err)
		goto err_name;

	device_initialize(&vdev->dev);

	return vdev;

err_name:
	ida_simple_remove(&vdpa_index_ida, vdev->index);
err_ida:
	kfree(vdev);
err:
	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(__vdpa_alloc_device);

static int vdpa_name_match(struct device *dev, const void *data)
{
	struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);

	return (strcmp(dev_name(&vdev->dev), data) == 0);
}

static int __vdpa_register_device(struct vdpa_device *vdev, int nvqs)
{
	struct device *dev;

	vdev->nvqs = nvqs;

	lockdep_assert_held(&vdpa_dev_mutex);
	dev = bus_find_device(&vdpa_bus, NULL, dev_name(&vdev->dev), vdpa_name_match);
	if (dev) {
		put_device(dev);
		return -EEXIST;
	}
	return device_add(&vdev->dev);
}

/**
 * _vdpa_register_device - register a vDPA device with vdpa lock held
 * Caller must have a succeed call of vdpa_alloc_device() before.
 * Caller must invoke this routine in the management device dev_add()
 * callback after setting up valid mgmtdev for this vdpa device.
 * @vdev: the vdpa device to be registered to vDPA bus
 * @nvqs: number of virtqueues supported by this device
 *
 * Return: Returns an error when fail to add device to vDPA bus
 */
int _vdpa_register_device(struct vdpa_device *vdev, int nvqs)
{
	if (!vdev->mdev)
		return -EINVAL;

	return __vdpa_register_device(vdev, nvqs);
}
EXPORT_SYMBOL_GPL(_vdpa_register_device);

/**
 * vdpa_register_device - register a vDPA device
 * Callers must have a succeed call of vdpa_alloc_device() before.
 * @vdev: the vdpa device to be registered to vDPA bus
 * @nvqs: number of virtqueues supported by this device
 *
 * Return: Returns an error when fail to add to vDPA bus
 */
int vdpa_register_device(struct vdpa_device *vdev, int nvqs)
{
	int err;

	mutex_lock(&vdpa_dev_mutex);
	err = __vdpa_register_device(vdev, nvqs);
	mutex_unlock(&vdpa_dev_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(vdpa_register_device);

/**
 * _vdpa_unregister_device - unregister a vDPA device
 * Caller must invoke this routine as part of management device dev_del()
 * callback.
 * @vdev: the vdpa device to be unregisted from vDPA bus
 */
void _vdpa_unregister_device(struct vdpa_device *vdev)
{
	lockdep_assert_held(&vdpa_dev_mutex);
	WARN_ON(!vdev->mdev);
	device_unregister(&vdev->dev);
}
EXPORT_SYMBOL_GPL(_vdpa_unregister_device);

/**
 * vdpa_unregister_device - unregister a vDPA device
 * @vdev: the vdpa device to be unregisted from vDPA bus
 */
void vdpa_unregister_device(struct vdpa_device *vdev)
{
	mutex_lock(&vdpa_dev_mutex);
	device_unregister(&vdev->dev);
	mutex_unlock(&vdpa_dev_mutex);
}
EXPORT_SYMBOL_GPL(vdpa_unregister_device);

/**
 * __vdpa_register_driver - register a vDPA device driver
 * @drv: the vdpa device driver to be registered
 * @owner: module owner of the driver
 *
 * Return: Returns an err when fail to do the registration
 */
int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner)
{
	drv->driver.bus = &vdpa_bus;
	drv->driver.owner = owner;

	return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(__vdpa_register_driver);

/**
 * vdpa_unregister_driver - unregister a vDPA device driver
 * @drv: the vdpa device driver to be unregistered
 */
void vdpa_unregister_driver(struct vdpa_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(vdpa_unregister_driver);

/**
 * vdpa_mgmtdev_register - register a vdpa management device
 *
 * @mdev: Pointer to vdpa management device
 * vdpa_mgmtdev_register() register a vdpa management device which supports
 * vdpa device management.
 * Return: Returns 0 on success or failure when required callback ops are not
 *         initialized.
 */
int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev)
{
	if (!mdev->device || !mdev->ops || !mdev->ops->dev_add || !mdev->ops->dev_del)
		return -EINVAL;

	INIT_LIST_HEAD(&mdev->list);
	mutex_lock(&vdpa_dev_mutex);
	list_add_tail(&mdev->list, &mdev_head);
	mutex_unlock(&vdpa_dev_mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(vdpa_mgmtdev_register);

static int vdpa_match_remove(struct device *dev, void *data)
{
	struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
	struct vdpa_mgmt_dev *mdev = vdev->mdev;

	if (mdev == data)
		mdev->ops->dev_del(mdev, vdev);
	return 0;
}

void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev)
{
	mutex_lock(&vdpa_dev_mutex);

	list_del(&mdev->list);

	/* Filter out all the entries belong to this management device and delete it. */
	bus_for_each_dev(&vdpa_bus, NULL, mdev, vdpa_match_remove);

	mutex_unlock(&vdpa_dev_mutex);
}
EXPORT_SYMBOL_GPL(vdpa_mgmtdev_unregister);

static bool mgmtdev_handle_match(const struct vdpa_mgmt_dev *mdev,
				 const char *busname, const char *devname)
{
	/* Bus name is optional for simulated management device, so ignore the
	 * device with bus if bus attribute is provided.
	 */
	if ((busname && !mdev->device->bus) || (!busname && mdev->device->bus))
		return false;

	if (!busname && strcmp(dev_name(mdev->device), devname) == 0)
		return true;

	if (busname && (strcmp(mdev->device->bus->name, busname) == 0) &&
	    (strcmp(dev_name(mdev->device), devname) == 0))
		return true;

	return false;
}

static struct vdpa_mgmt_dev *vdpa_mgmtdev_get_from_attr(struct nlattr **attrs)
{
	struct vdpa_mgmt_dev *mdev;
	const char *busname = NULL;
	const char *devname;

	if (!attrs[VDPA_ATTR_MGMTDEV_DEV_NAME])
		return ERR_PTR(-EINVAL);
	devname = nla_data(attrs[VDPA_ATTR_MGMTDEV_DEV_NAME]);
	if (attrs[VDPA_ATTR_MGMTDEV_BUS_NAME])
		busname = nla_data(attrs[VDPA_ATTR_MGMTDEV_BUS_NAME]);

	list_for_each_entry(mdev, &mdev_head, list) {
		if (mgmtdev_handle_match(mdev, busname, devname))
			return mdev;
	}
	return ERR_PTR(-ENODEV);
}

static int vdpa_nl_mgmtdev_handle_fill(struct sk_buff *msg, const struct vdpa_mgmt_dev *mdev)
{
	if (mdev->device->bus &&
	    nla_put_string(msg, VDPA_ATTR_MGMTDEV_BUS_NAME, mdev->device->bus->name))
		return -EMSGSIZE;
	if (nla_put_string(msg, VDPA_ATTR_MGMTDEV_DEV_NAME, dev_name(mdev->device)))
		return -EMSGSIZE;
	return 0;
}

static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg,
			     u32 portid, u32 seq, int flags)
{
	u64 supported_classes = 0;
	void *hdr;
	int i = 0;
	int err;

	hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW);
	if (!hdr)
		return -EMSGSIZE;
	err = vdpa_nl_mgmtdev_handle_fill(msg, mdev);
	if (err)
		goto msg_err;

	while (mdev->id_table[i].device) {
		supported_classes |= BIT(mdev->id_table[i].device);
		i++;
	}

	if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
			      supported_classes, VDPA_ATTR_UNSPEC)) {
		err = -EMSGSIZE;
		goto msg_err;
	}

	genlmsg_end(msg, hdr);
	return 0;

msg_err:
	genlmsg_cancel(msg, hdr);
	return err;
}

static int vdpa_nl_cmd_mgmtdev_get_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct vdpa_mgmt_dev *mdev;
	struct sk_buff *msg;
	int err;

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	mutex_lock(&vdpa_dev_mutex);
	mdev = vdpa_mgmtdev_get_from_attr(info->attrs);
	if (IS_ERR(mdev)) {
		mutex_unlock(&vdpa_dev_mutex);
		NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified mgmt device");
		err = PTR_ERR(mdev);
		goto out;
	}

	err = vdpa_mgmtdev_fill(mdev, msg, info->snd_portid, info->snd_seq, 0);
	mutex_unlock(&vdpa_dev_mutex);
	if (err)
		goto out;
	err = genlmsg_reply(msg, info);
	return err;

out:
	nlmsg_free(msg);
	return err;
}

static int
vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
{
	struct vdpa_mgmt_dev *mdev;
	int start = cb->args[0];
	int idx = 0;
	int err;

	mutex_lock(&vdpa_dev_mutex);
	list_for_each_entry(mdev, &mdev_head, list) {
		if (idx < start) {
			idx++;
			continue;
		}
		err = vdpa_mgmtdev_fill(mdev, msg, NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq, NLM_F_MULTI);
		if (err)
			goto out;
		idx++;
	}
out:
	mutex_unlock(&vdpa_dev_mutex);
	cb->args[0] = idx;
	return msg->len;
}

static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct vdpa_mgmt_dev *mdev;
	const char *name;
	int err = 0;

	if (!info->attrs[VDPA_ATTR_DEV_NAME])
		return -EINVAL;

	name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);

	mutex_lock(&vdpa_dev_mutex);
	mdev = vdpa_mgmtdev_get_from_attr(info->attrs);
	if (IS_ERR(mdev)) {
		NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified management device");
		err = PTR_ERR(mdev);
		goto err;
	}

	err = mdev->ops->dev_add(mdev, name);
err:
	mutex_unlock(&vdpa_dev_mutex);
	return err;
}

static int vdpa_nl_cmd_dev_del_set_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct vdpa_mgmt_dev *mdev;
	struct vdpa_device *vdev;
	struct device *dev;
	const char *name;
	int err = 0;

	if (!info->attrs[VDPA_ATTR_DEV_NAME])
		return -EINVAL;
	name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);

	mutex_lock(&vdpa_dev_mutex);
	dev = bus_find_device(&vdpa_bus, NULL, name, vdpa_name_match);
	if (!dev) {
		NL_SET_ERR_MSG_MOD(info->extack, "device not found");
		err = -ENODEV;
		goto dev_err;
	}
	vdev = container_of(dev, struct vdpa_device, dev);
	if (!vdev->mdev) {
		NL_SET_ERR_MSG_MOD(info->extack, "Only user created device can be deleted by user");
		err = -EINVAL;
		goto mdev_err;
	}
	mdev = vdev->mdev;
	mdev->ops->dev_del(mdev, vdev);
mdev_err:
	put_device(dev);
dev_err:
	mutex_unlock(&vdpa_dev_mutex);
	return err;
}

static int
vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq,
	      int flags, struct netlink_ext_ack *extack)
{
	u16 max_vq_size;
	u32 device_id;
	u32 vendor_id;
	void *hdr;
	int err;

	hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_DEV_NEW);
	if (!hdr)
		return -EMSGSIZE;

	err = vdpa_nl_mgmtdev_handle_fill(msg, vdev->mdev);
	if (err)
		goto msg_err;

	device_id = vdev->config->get_device_id(vdev);
	vendor_id = vdev->config->get_vendor_id(vdev);
	max_vq_size = vdev->config->get_vq_num_max(vdev);

	err = -EMSGSIZE;
	if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev)))
		goto msg_err;
	if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id))
		goto msg_err;
	if (nla_put_u32(msg, VDPA_ATTR_DEV_VENDOR_ID, vendor_id))
		goto msg_err;
	if (nla_put_u32(msg, VDPA_ATTR_DEV_MAX_VQS, vdev->nvqs))
		goto msg_err;
	if (nla_put_u16(msg, VDPA_ATTR_DEV_MAX_VQ_SIZE, max_vq_size))
		goto msg_err;

	genlmsg_end(msg, hdr);
	return 0;

msg_err:
	genlmsg_cancel(msg, hdr);
	return err;
}

static int vdpa_nl_cmd_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct vdpa_device *vdev;
	struct sk_buff *msg;
	const char *devname;
	struct device *dev;
	int err;

	if (!info->attrs[VDPA_ATTR_DEV_NAME])
		return -EINVAL;
	devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	mutex_lock(&vdpa_dev_mutex);
	dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
	if (!dev) {
		NL_SET_ERR_MSG_MOD(info->extack, "device not found");
		err = -ENODEV;
		goto err;
	}
	vdev = container_of(dev, struct vdpa_device, dev);
	if (!vdev->mdev) {
		err = -EINVAL;
		goto mdev_err;
	}
	err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0, info->extack);
	if (!err)
		err = genlmsg_reply(msg, info);
mdev_err:
	put_device(dev);
err:
	mutex_unlock(&vdpa_dev_mutex);
	if (err)
		nlmsg_free(msg);
	return err;
}

struct vdpa_dev_dump_info {
	struct sk_buff *msg;
	struct netlink_callback *cb;
	int start_idx;
	int idx;
};

static int vdpa_dev_dump(struct device *dev, void *data)
{
	struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
	struct vdpa_dev_dump_info *info = data;
	int err;

	if (!vdev->mdev)
		return 0;
	if (info->idx < info->start_idx) {
		info->idx++;
		return 0;
	}
	err = vdpa_dev_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid,
			    info->cb->nlh->nlmsg_seq, NLM_F_MULTI, info->cb->extack);
	if (err)
		return err;

	info->idx++;
	return 0;
}

static int vdpa_nl_cmd_dev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
{
	struct vdpa_dev_dump_info info;

	info.msg = msg;
	info.cb = cb;
	info.start_idx = cb->args[0];
	info.idx = 0;

	mutex_lock(&vdpa_dev_mutex);
	bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_dump);
	mutex_unlock(&vdpa_dev_mutex);
	cb->args[0] = info.idx;
	return msg->len;
}

static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = {
	[VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING },
	[VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING },
	[VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING },
};

static const struct genl_ops vdpa_nl_ops[] = {
	{
		.cmd = VDPA_CMD_MGMTDEV_GET,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = vdpa_nl_cmd_mgmtdev_get_doit,
		.dumpit = vdpa_nl_cmd_mgmtdev_get_dumpit,
	},
	{
		.cmd = VDPA_CMD_DEV_NEW,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = vdpa_nl_cmd_dev_add_set_doit,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = VDPA_CMD_DEV_DEL,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = vdpa_nl_cmd_dev_del_set_doit,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = VDPA_CMD_DEV_GET,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = vdpa_nl_cmd_dev_get_doit,
		.dumpit = vdpa_nl_cmd_dev_get_dumpit,
	},
};

static struct genl_family vdpa_nl_family __ro_after_init = {
	.name = VDPA_GENL_NAME,
	.version = VDPA_GENL_VERSION,
	.maxattr = VDPA_ATTR_MAX,
	.policy = vdpa_nl_policy,
	.netnsok = false,
	.module = THIS_MODULE,
	.ops = vdpa_nl_ops,
	.n_ops = ARRAY_SIZE(vdpa_nl_ops),
};

static int vdpa_init(void)
{
	int err;

	err = bus_register(&vdpa_bus);
	if (err)
		return err;
	err = genl_register_family(&vdpa_nl_family);
	if (err)
		goto err;
	return 0;

err:
	bus_unregister(&vdpa_bus);
	return err;
}

static void __exit vdpa_exit(void)
{
	genl_unregister_family(&vdpa_nl_family);
	bus_unregister(&vdpa_bus);
	ida_destroy(&vdpa_index_ida);
}
core_initcall(vdpa_init);
module_exit(vdpa_exit);

MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
MODULE_LICENSE("GPL v2");