aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pci/iov.c
blob: b497daab3d4a26ebf5b818bacdcf798fa9d4f9ef (plain) (blame)
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
680
681
/*
 * drivers/pci/iov.c
 *
 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
 *
 * PCI Express I/O Virtualization (IOV) support.
 *   Single Root IOV 1.0
 */

#include <linux/pci.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/delay.h>
#include "pci.h"

#define VIRTFN_ID_LEN	16

static inline u8 virtfn_bus(struct pci_dev *dev, int id)
{
	return dev->bus->number + ((dev->devfn + dev->sriov->offset +
				    dev->sriov->stride * id) >> 8);
}

static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
{
	return (dev->devfn + dev->sriov->offset +
		dev->sriov->stride * id) & 0xff;
}

static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
{
	int rc;
	struct pci_bus *child;

	if (bus->number == busnr)
		return bus;

	child = pci_find_bus(pci_domain_nr(bus), busnr);
	if (child)
		return child;

	child = pci_add_new_bus(bus, NULL, busnr);
	if (!child)
		return NULL;

	child->subordinate = busnr;
	child->dev.parent = bus->bridge;
	rc = pci_bus_add_child(child);
	if (rc) {
		pci_remove_bus(child);
		return NULL;
	}

	return child;
}

static void virtfn_remove_bus(struct pci_bus *bus, int busnr)
{
	struct pci_bus *child;

	if (bus->number == busnr)
		return;

	child = pci_find_bus(pci_domain_nr(bus), busnr);
	BUG_ON(!child);

	if (list_empty(&child->devices))
		pci_remove_bus(child);
}

static int virtfn_add(struct pci_dev *dev, int id, int reset)
{
	int i;
	int rc;
	u64 size;
	char buf[VIRTFN_ID_LEN];
	struct pci_dev *virtfn;
	struct resource *res;
	struct pci_sriov *iov = dev->sriov;

	virtfn = alloc_pci_dev();
	if (!virtfn)
		return -ENOMEM;

	mutex_lock(&iov->dev->sriov->lock);
	virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
	if (!virtfn->bus) {
		kfree(virtfn);
		mutex_unlock(&iov->dev->sriov->lock);
		return -ENOMEM;
	}
	virtfn->devfn = virtfn_devfn(dev, id);
	virtfn->vendor = dev->vendor;
	pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
	pci_setup_device(virtfn);
	virtfn->dev.parent = dev->dev.parent;

	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = dev->resource + PCI_IOV_RESOURCES + i;
		if (!res->parent)
			continue;
		virtfn->resource[i].name = pci_name(virtfn);
		virtfn->resource[i].flags = res->flags;
		size = resource_size(res);
		do_div(size, iov->total);
		virtfn->resource[i].start = res->start + size * id;
		virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
		rc = request_resource(res, &virtfn->resource[i]);
		BUG_ON(rc);
	}

	if (reset)
		pci_execute_reset_function(virtfn);

	pci_device_add(virtfn, virtfn->bus);
	mutex_unlock(&iov->dev->sriov->lock);

	virtfn->physfn = pci_dev_get(dev);
	virtfn->is_virtfn = 1;

	rc = pci_bus_add_device(virtfn);
	if (rc)
		goto failed1;
	sprintf(buf, "virtfn%u", id);
	rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
	if (rc)
		goto failed1;
	rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
	if (rc)
		goto failed2;

	kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);

	return 0;

failed2:
	sysfs_remove_link(&dev->dev.kobj, buf);
failed1:
	pci_dev_put(dev);
	mutex_lock(&iov->dev->sriov->lock);
	pci_remove_bus_device(virtfn);
	virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
	mutex_unlock(&iov->dev->sriov->lock);

	return rc;
}

static void virtfn_remove(struct pci_dev *dev, int id, int reset)
{
	char buf[VIRTFN_ID_LEN];
	struct pci_bus *bus;
	struct pci_dev *virtfn;
	struct pci_sriov *iov = dev->sriov;

	bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id));
	if (!bus)
		return;

	virtfn = pci_get_slot(bus, virtfn_devfn(dev, id));
	if (!virtfn)
		return;

	pci_dev_put(virtfn);

	if (reset) {
		device_release_driver(&virtfn->dev);
		pci_execute_reset_function(virtfn);
	}

	sprintf(buf, "virtfn%u", id);
	sysfs_remove_link(&dev->dev.kobj, buf);
	sysfs_remove_link(&virtfn->dev.kobj, "physfn");

	mutex_lock(&iov->dev->sriov->lock);
	pci_remove_bus_device(virtfn);
	virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
	mutex_unlock(&iov->dev->sriov->lock);

	pci_dev_put(dev);
}

static int sriov_migration(struct pci_dev *dev)
{
	u16 status;
	struct pci_sriov *iov = dev->sriov;

	if (!iov->nr_virtfn)
		return 0;

	if (!(iov->cap & PCI_SRIOV_CAP_VFM))
		return 0;

	pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status);
	if (!(status & PCI_SRIOV_STATUS_VFM))
		return 0;

	schedule_work(&iov->mtask);

	return 1;
}

static void sriov_migration_task(struct work_struct *work)
{
	int i;
	u8 state;
	u16 status;
	struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);

	for (i = iov->initial; i < iov->nr_virtfn; i++) {
		state = readb(iov->mstate + i);
		if (state == PCI_SRIOV_VFM_MI) {
			writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
			state = readb(iov->mstate + i);
			if (state == PCI_SRIOV_VFM_AV)
				virtfn_add(iov->self, i, 1);
		} else if (state == PCI_SRIOV_VFM_MO) {
			virtfn_remove(iov->self, i, 1);
			writeb(PCI_SRIOV_VFM_UA, iov->mstate + i);
			state = readb(iov->mstate + i);
			if (state == PCI_SRIOV_VFM_AV)
				virtfn_add(iov->self, i, 0);
		}
	}

	pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status);
	status &= ~PCI_SRIOV_STATUS_VFM;
	pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status);
}

static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
{
	int bir;
	u32 table;
	resource_size_t pa;
	struct pci_sriov *iov = dev->sriov;

	if (nr_virtfn <= iov->initial)
		return 0;

	pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
	bir = PCI_SRIOV_VFM_BIR(table);
	if (bir > PCI_STD_RESOURCE_END)
		return -EIO;

	table = PCI_SRIOV_VFM_OFFSET(table);
	if (table + nr_virtfn > pci_resource_len(dev, bir))
		return -EIO;

	pa = pci_resource_start(dev, bir) + table;
	iov->mstate = ioremap(pa, nr_virtfn);
	if (!iov->mstate)
		return -ENOMEM;

	INIT_WORK(&iov->mtask, sriov_migration_task);

	iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR;
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);

	return 0;
}

static void sriov_disable_migration(struct pci_dev *dev)
{
	struct pci_sriov *iov = dev->sriov;

	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR);
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);

	cancel_work_sync(&iov->mtask);
	iounmap(iov->mstate);
}

static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
{
	int rc;
	int i, j;
	int nres;
	u16 offset, stride, initial;
	struct resource *res;
	struct pci_dev *pdev;
	struct pci_sriov *iov = dev->sriov;

	if (!nr_virtfn)
		return 0;

	if (iov->nr_virtfn)
		return -EINVAL;

	pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
	if (initial > iov->total ||
	    (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
		return -EIO;

	if (nr_virtfn < 0 || nr_virtfn > iov->total ||
	    (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
		return -EINVAL;

	pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
	pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
	pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
	if (!offset || (nr_virtfn > 1 && !stride))
		return -EIO;

	nres = 0;
	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = dev->resource + PCI_IOV_RESOURCES + i;
		if (res->parent)
			nres++;
	}
	if (nres != iov->nres) {
		dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
		return -ENOMEM;
	}

	iov->offset = offset;
	iov->stride = stride;

	if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->subordinate) {
		dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
		return -ENOMEM;
	}

	if (iov->link != dev->devfn) {
		pdev = pci_get_slot(dev->bus, iov->link);
		if (!pdev)
			return -ENODEV;

		pci_dev_put(pdev);

		if (!pdev->is_physfn)
			return -ENODEV;

		rc = sysfs_create_link(&dev->dev.kobj,
					&pdev->dev.kobj, "dep_link");
		if (rc)
			return rc;
	}

	iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
	pci_block_user_cfg_access(dev);
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
	msleep(100);
	pci_unblock_user_cfg_access(dev);

	iov->initial = initial;
	if (nr_virtfn < initial)
		initial = nr_virtfn;

	for (i = 0; i < initial; i++) {
		rc = virtfn_add(dev, i, 0);
		if (rc)
			goto failed;
	}

	if (iov->cap & PCI_SRIOV_CAP_VFM) {
		rc = sriov_enable_migration(dev, nr_virtfn);
		if (rc)
			goto failed;
	}

	kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
	iov->nr_virtfn = nr_virtfn;

	return 0;

failed:
	for (j = 0; j < i; j++)
		virtfn_remove(dev, j, 0);

	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
	pci_block_user_cfg_access(dev);
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
	ssleep(1);
	pci_unblock_user_cfg_access(dev);

	if (iov->link != dev->devfn)
		sysfs_remove_link(&dev->dev.kobj, "dep_link");

	return rc;
}

static void sriov_disable(struct pci_dev *dev)
{
	int i;
	struct pci_sriov *iov = dev->sriov;

	if (!iov->nr_virtfn)
		return;

	if (iov->cap & PCI_SRIOV_CAP_VFM)
		sriov_disable_migration(dev);

	for (i = 0; i < iov->nr_virtfn; i++)
		virtfn_remove(dev, i, 0);

	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
	pci_block_user_cfg_access(dev);
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
	ssleep(1);
	pci_unblock_user_cfg_access(dev);

	if (iov->link != dev->devfn)
		sysfs_remove_link(&dev->dev.kobj, "dep_link");

	iov->nr_virtfn = 0;
}

static int sriov_init(struct pci_dev *dev, int pos)
{
	int i;
	int rc;
	int nres;
	u32 pgsz;
	u16 ctrl, total, offset, stride;
	struct pci_sriov *iov;
	struct resource *res;
	struct pci_dev *pdev;

	if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
	    dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
		return -ENODEV;

	pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
	if (ctrl & PCI_SRIOV_CTRL_VFE) {
		pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
		ssleep(1);
	}

	pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
	if (!total)
		return 0;

	ctrl = 0;
	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
		if (pdev->is_physfn)
			goto found;

	pdev = NULL;
	if (pci_ari_enabled(dev->bus))
		ctrl |= PCI_SRIOV_CTRL_ARI;

found:
	pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
	pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
	pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
	pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
	if (!offset || (total > 1 && !stride))
		return -EIO;

	pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
	i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
	pgsz &= ~((1 << i) - 1);
	if (!pgsz)
		return -EIO;

	pgsz &= ~(pgsz - 1);
	pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);

	nres = 0;
	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = dev->resource + PCI_IOV_RESOURCES + i;
		i += __pci_read_base(dev, pci_bar_unknown, res,
				     pos + PCI_SRIOV_BAR + i * 4);
		if (!res->flags)
			continue;
		if (resource_size(res) & (PAGE_SIZE - 1)) {
			rc = -EIO;
			goto failed;
		}
		res->end = res->start + resource_size(res) * total - 1;
		nres++;
	}

	iov = kzalloc(sizeof(*iov), GFP_KERNEL);
	if (!iov) {
		rc = -ENOMEM;
		goto failed;
	}

	iov->pos = pos;
	iov->nres = nres;
	iov->ctrl = ctrl;
	iov->total = total;
	iov->offset = offset;
	iov->stride = stride;
	iov->pgsz = pgsz;
	iov->self = dev;
	pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
	pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);

	if (pdev)
		iov->dev = pci_dev_get(pdev);
	else {
		iov->dev = dev;
		mutex_init(&iov->lock);
	}

	dev->sriov = iov;
	dev->is_physfn = 1;

	return 0;

failed:
	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = dev->resource + PCI_IOV_RESOURCES + i;
		res->flags = 0;
	}

	return rc;
}

static void sriov_release(struct pci_dev *dev)
{
	BUG_ON(dev->sriov->nr_virtfn);

	if (dev == dev->sriov->dev)
		mutex_destroy(&dev->sriov->lock);
	else
		pci_dev_put(dev->sriov->dev);

	kfree(dev->sriov);
	dev->sriov = NULL;
}

static void sriov_restore_state(struct pci_dev *dev)
{
	int i;
	u16 ctrl;
	struct pci_sriov *iov = dev->sriov;

	pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
	if (ctrl & PCI_SRIOV_CTRL_VFE)
		return;

	for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
		pci_update_resource(dev, i);

	pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
	if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
		msleep(100);
}

/**
 * pci_iov_init - initialize the IOV capability
 * @dev: the PCI device
 *
 * Returns 0 on success, or negative on failure.
 */
int pci_iov_init(struct pci_dev *dev)
{
	int pos;

	if (!dev->is_pcie)
		return -ENODEV;

	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
	if (pos)
		return sriov_init(dev, pos);

	return -ENODEV;
}

/**
 * pci_iov_release - release resources used by the IOV capability
 * @dev: the PCI device
 */
void pci_iov_release(struct pci_dev *dev)
{
	if (dev->is_physfn)
		sriov_release(dev);
}

/**
 * pci_iov_resource_bar - get position of the SR-IOV BAR
 * @dev: the PCI device
 * @resno: the resource number
 * @type: the BAR type to be filled in
 *
 * Returns position of the BAR encapsulated in the SR-IOV capability.
 */
int pci_iov_resource_bar(struct pci_dev *dev, int resno,
			 enum pci_bar_type *type)
{
	if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
		return 0;

	BUG_ON(!dev->is_physfn);

	*type = pci_bar_unknown;

	return dev->sriov->pos + PCI_SRIOV_BAR +
		4 * (resno - PCI_IOV_RESOURCES);
}

/**
 * pci_restore_iov_state - restore the state of the IOV capability
 * @dev: the PCI device
 */
void pci_restore_iov_state(struct pci_dev *dev)
{
	if (dev->is_physfn)
		sriov_restore_state(dev);
}

/**
 * pci_iov_bus_range - find bus range used by Virtual Function
 * @bus: the PCI bus
 *
 * Returns max number of buses (exclude current one) used by Virtual
 * Functions.
 */
int pci_iov_bus_range(struct pci_bus *bus)
{
	int max = 0;
	u8 busnr;
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (!dev->is_physfn)
			continue;
		busnr = virtfn_bus(dev, dev->sriov->total - 1);
		if (busnr > max)
			max = busnr;
	}

	return max ? max - bus->number : 0;
}

/**
 * pci_enable_sriov - enable the SR-IOV capability
 * @dev: the PCI device
 * @nr_virtfn: number of virtual functions to enable
 *
 * Returns 0 on success, or negative on failure.
 */
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{
	might_sleep();

	if (!dev->is_physfn)
		return -ENODEV;

	return sriov_enable(dev, nr_virtfn);
}
EXPORT_SYMBOL_GPL(pci_enable_sriov);

/**
 * pci_disable_sriov - disable the SR-IOV capability
 * @dev: the PCI device
 */
void pci_disable_sriov(struct pci_dev *dev)
{
	might_sleep();

	if (!dev->is_physfn)
		return;

	sriov_disable(dev);
}
EXPORT_SYMBOL_GPL(pci_disable_sriov);

/**
 * pci_sriov_migration - notify SR-IOV core of Virtual Function Migration
 * @dev: the PCI device
 *
 * Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not.
 *
 * Physical Function driver is responsible to register IRQ handler using
 * VF Migration Interrupt Message Number, and call this function when the
 * interrupt is generated by the hardware.
 */
irqreturn_t pci_sriov_migration(struct pci_dev *dev)
{
	if (!dev->is_physfn)
		return IRQ_NONE;

	return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE;
}
EXPORT_SYMBOL_GPL(pci_sriov_migration);