summaryrefslogtreecommitdiffstats
path: root/drivers/vdpa/pds/vdpa_dev.c
blob: 25c0fe5ec3d5dfacdb53fa31a709851adb118942 (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
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2023 Advanced Micro Devices, Inc */

#include <linux/pci.h>
#include <linux/vdpa.h>
#include <uapi/linux/vdpa.h>
#include <linux/virtio_pci_modern.h>

#include <linux/pds/pds_common.h>
#include <linux/pds/pds_core_if.h>
#include <linux/pds/pds_adminq.h>
#include <linux/pds/pds_auxbus.h>

#include "vdpa_dev.h"
#include "aux_drv.h"
#include "cmds.h"
#include "debugfs.h"

static u64 pds_vdpa_get_driver_features(struct vdpa_device *vdpa_dev);

static struct pds_vdpa_device *vdpa_to_pdsv(struct vdpa_device *vdpa_dev)
{
	return container_of(vdpa_dev, struct pds_vdpa_device, vdpa_dev);
}

static int pds_vdpa_notify_handler(struct notifier_block *nb,
				   unsigned long ecode,
				   void *data)
{
	struct pds_vdpa_device *pdsv = container_of(nb, struct pds_vdpa_device, nb);
	struct device *dev = &pdsv->vdpa_aux->padev->aux_dev.dev;

	dev_dbg(dev, "%s: event code %lu\n", __func__, ecode);

	if (ecode == PDS_EVENT_RESET || ecode == PDS_EVENT_LINK_CHANGE) {
		if (pdsv->config_cb.callback)
			pdsv->config_cb.callback(pdsv->config_cb.private);
	}

	return 0;
}

static int pds_vdpa_register_event_handler(struct pds_vdpa_device *pdsv)
{
	struct device *dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
	struct notifier_block *nb = &pdsv->nb;
	int err;

	if (!nb->notifier_call) {
		nb->notifier_call = pds_vdpa_notify_handler;
		err = pdsc_register_notify(nb);
		if (err) {
			nb->notifier_call = NULL;
			dev_err(dev, "failed to register pds event handler: %ps\n",
				ERR_PTR(err));
			return -EINVAL;
		}
		dev_dbg(dev, "pds event handler registered\n");
	}

	return 0;
}

static void pds_vdpa_unregister_event_handler(struct pds_vdpa_device *pdsv)
{
	if (pdsv->nb.notifier_call) {
		pdsc_unregister_notify(&pdsv->nb);
		pdsv->nb.notifier_call = NULL;
	}
}

static int pds_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
				   u64 desc_addr, u64 driver_addr, u64 device_addr)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	pdsv->vqs[qid].desc_addr = desc_addr;
	pdsv->vqs[qid].avail_addr = driver_addr;
	pdsv->vqs[qid].used_addr = device_addr;

	return 0;
}

static void pds_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid, u32 num)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	pdsv->vqs[qid].q_len = num;
}

static void pds_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	iowrite16(qid, pdsv->vqs[qid].notify);
}

static void pds_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
			       struct vdpa_callback *cb)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	pdsv->vqs[qid].event_cb = *cb;
}

static irqreturn_t pds_vdpa_isr(int irq, void *data)
{
	struct pds_vdpa_vq_info *vq;

	vq = data;
	if (vq->event_cb.callback)
		vq->event_cb.callback(vq->event_cb.private);

	return IRQ_HANDLED;
}

static void pds_vdpa_release_irq(struct pds_vdpa_device *pdsv, int qid)
{
	if (pdsv->vqs[qid].irq == VIRTIO_MSI_NO_VECTOR)
		return;

	free_irq(pdsv->vqs[qid].irq, &pdsv->vqs[qid]);
	pdsv->vqs[qid].irq = VIRTIO_MSI_NO_VECTOR;
}

static void pds_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev, u16 qid, bool ready)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct device *dev = &pdsv->vdpa_dev.dev;
	u64 driver_features;
	u16 invert_idx = 0;
	int err;

	dev_dbg(dev, "%s: qid %d ready %d => %d\n",
		__func__, qid, pdsv->vqs[qid].ready, ready);
	if (ready == pdsv->vqs[qid].ready)
		return;

	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
	if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED))
		invert_idx = PDS_VDPA_PACKED_INVERT_IDX;

	if (ready) {
		/* Pass vq setup info to DSC using adminq to gather up and
		 * send all info at once so FW can do its full set up in
		 * one easy operation
		 */
		err = pds_vdpa_cmd_init_vq(pdsv, qid, invert_idx, &pdsv->vqs[qid]);
		if (err) {
			dev_err(dev, "Failed to init vq %d: %pe\n",
				qid, ERR_PTR(err));
			ready = false;
		}
	} else {
		err = pds_vdpa_cmd_reset_vq(pdsv, qid, invert_idx, &pdsv->vqs[qid]);
		if (err)
			dev_err(dev, "%s: reset_vq failed qid %d: %pe\n",
				__func__, qid, ERR_PTR(err));
	}

	pdsv->vqs[qid].ready = ready;
}

static bool pds_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	return pdsv->vqs[qid].ready;
}

static int pds_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
				 const struct vdpa_vq_state *state)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
	struct device *dev = &padev->aux_dev.dev;
	u64 driver_features;
	u16 avail;
	u16 used;

	if (pdsv->vqs[qid].ready) {
		dev_err(dev, "Setting device position is denied while vq is enabled\n");
		return -EINVAL;
	}

	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
	if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
		avail = state->packed.last_avail_idx |
			(state->packed.last_avail_counter << 15);
		used = state->packed.last_used_idx |
		       (state->packed.last_used_counter << 15);

		/* The avail and used index are stored with the packed wrap
		 * counter bit inverted.  This way, in case set_vq_state is
		 * not called, the initial value can be set to zero prior to
		 * feature negotiation, and it is good for both packed and
		 * split vq.
		 */
		avail ^= PDS_VDPA_PACKED_INVERT_IDX;
		used ^= PDS_VDPA_PACKED_INVERT_IDX;
	} else {
		avail = state->split.avail_index;
		/* state->split does not provide a used_index:
		 * the vq will be set to "empty" here, and the vq will read
		 * the current used index the next time the vq is kicked.
		 */
		used = avail;
	}

	if (used != avail) {
		dev_dbg(dev, "Setting used equal to avail, for interoperability\n");
		used = avail;
	}

	pdsv->vqs[qid].avail_idx = avail;
	pdsv->vqs[qid].used_idx = used;

	return 0;
}

static int pds_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
				 struct vdpa_vq_state *state)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
	struct device *dev = &padev->aux_dev.dev;
	u64 driver_features;
	u16 avail;
	u16 used;

	if (pdsv->vqs[qid].ready) {
		dev_err(dev, "Getting device position is denied while vq is enabled\n");
		return -EINVAL;
	}

	avail = pdsv->vqs[qid].avail_idx;
	used = pdsv->vqs[qid].used_idx;

	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
	if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
		avail ^= PDS_VDPA_PACKED_INVERT_IDX;
		used ^= PDS_VDPA_PACKED_INVERT_IDX;

		state->packed.last_avail_idx = avail & 0x7fff;
		state->packed.last_avail_counter = avail >> 15;
		state->packed.last_used_idx = used & 0x7fff;
		state->packed.last_used_counter = used >> 15;
	} else {
		state->split.avail_index = avail;
		/* state->split does not provide a used_index. */
	}

	return 0;
}

static struct vdpa_notification_area
pds_vdpa_get_vq_notification(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct virtio_pci_modern_device *vd_mdev;
	struct vdpa_notification_area area;

	area.addr = pdsv->vqs[qid].notify_pa;

	vd_mdev = &pdsv->vdpa_aux->vd_mdev;
	if (!vd_mdev->notify_offset_multiplier)
		area.size = PDS_PAGE_SIZE;
	else
		area.size = vd_mdev->notify_offset_multiplier;

	return area;
}

static int pds_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	return pdsv->vqs[qid].irq;
}

static u32 pds_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
{
	return PDS_PAGE_SIZE;
}

static u32 pds_vdpa_get_vq_group(struct vdpa_device *vdpa_dev, u16 idx)
{
	return 0;
}

static u64 pds_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	return pdsv->supported_features;
}

static int pds_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct device *dev = &pdsv->vdpa_dev.dev;
	u64 driver_features;
	u64 nego_features;
	u64 hw_features;
	u64 missing;

	if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
		dev_err(dev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
		return -EOPNOTSUPP;
	}

	/* Check for valid feature bits */
	nego_features = features & pdsv->supported_features;
	missing = features & ~nego_features;
	if (missing) {
		dev_err(dev, "Can't support all requested features in %#llx, missing %#llx features\n",
			features, missing);
		return -EOPNOTSUPP;
	}

	driver_features = pds_vdpa_get_driver_features(vdpa_dev);
	pdsv->negotiated_features = nego_features;
	dev_dbg(dev, "%s: %#llx => %#llx\n",
		__func__, driver_features, nego_features);

	/* if we're faking the F_MAC, strip it before writing to device */
	hw_features = le64_to_cpu(pdsv->vdpa_aux->ident.hw_features);
	if (!(hw_features & BIT_ULL(VIRTIO_NET_F_MAC)))
		nego_features &= ~BIT_ULL(VIRTIO_NET_F_MAC);

	if (driver_features == nego_features)
		return 0;

	vp_modern_set_features(&pdsv->vdpa_aux->vd_mdev, nego_features);

	return 0;
}

static u64 pds_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	return pdsv->negotiated_features;
}

static void pds_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
				   struct vdpa_callback *cb)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	pdsv->config_cb.callback = cb->callback;
	pdsv->config_cb.private = cb->private;
}

static u16 pds_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	/* qemu has assert() that vq_num_max <= VIRTQUEUE_MAX_SIZE (1024) */
	return min_t(u16, 1024, BIT(le16_to_cpu(pdsv->vdpa_aux->ident.max_qlen)));
}

static u32 pds_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
{
	return VIRTIO_ID_NET;
}

static u32 pds_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
{
	return PCI_VENDOR_ID_PENSANDO;
}

static u8 pds_vdpa_get_status(struct vdpa_device *vdpa_dev)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);

	return vp_modern_get_status(&pdsv->vdpa_aux->vd_mdev);
}

static int pds_vdpa_request_irqs(struct pds_vdpa_device *pdsv)
{
	struct pci_dev *pdev = pdsv->vdpa_aux->padev->vf_pdev;
	struct pds_vdpa_aux *vdpa_aux = pdsv->vdpa_aux;
	struct device *dev = &pdsv->vdpa_dev.dev;
	int max_vq, nintrs, qid, err;

	max_vq = vdpa_aux->vdpa_mdev.max_supported_vqs;

	nintrs = pci_alloc_irq_vectors(pdev, max_vq, max_vq, PCI_IRQ_MSIX);
	if (nintrs < 0) {
		dev_err(dev, "Couldn't get %d msix vectors: %pe\n",
			max_vq, ERR_PTR(nintrs));
		return nintrs;
	}

	for (qid = 0; qid < pdsv->num_vqs; ++qid) {
		int irq = pci_irq_vector(pdev, qid);

		snprintf(pdsv->vqs[qid].irq_name, sizeof(pdsv->vqs[qid].irq_name),
			 "vdpa-%s-%d", dev_name(dev), qid);

		err = request_irq(irq, pds_vdpa_isr, 0,
				  pdsv->vqs[qid].irq_name,
				  &pdsv->vqs[qid]);
		if (err) {
			dev_err(dev, "%s: no irq for qid %d: %pe\n",
				__func__, qid, ERR_PTR(err));
			goto err_release;
		}

		pdsv->vqs[qid].irq = irq;
	}

	vdpa_aux->nintrs = nintrs;

	return 0;

err_release:
	while (qid--)
		pds_vdpa_release_irq(pdsv, qid);

	pci_free_irq_vectors(pdev);

	vdpa_aux->nintrs = 0;

	return err;
}

static void pds_vdpa_release_irqs(struct pds_vdpa_device *pdsv)
{
	struct pci_dev *pdev = pdsv->vdpa_aux->padev->vf_pdev;
	struct pds_vdpa_aux *vdpa_aux = pdsv->vdpa_aux;
	int qid;

	if (!vdpa_aux->nintrs)
		return;

	for (qid = 0; qid < pdsv->num_vqs; qid++)
		pds_vdpa_release_irq(pdsv, qid);

	pci_free_irq_vectors(pdev);

	vdpa_aux->nintrs = 0;
}

static void pds_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct device *dev = &pdsv->vdpa_dev.dev;
	u8 old_status;
	int i;

	old_status = pds_vdpa_get_status(vdpa_dev);
	dev_dbg(dev, "%s: old %#x new %#x\n", __func__, old_status, status);

	if (status & ~old_status & VIRTIO_CONFIG_S_DRIVER_OK) {
		if (pds_vdpa_request_irqs(pdsv))
			status = old_status | VIRTIO_CONFIG_S_FAILED;
	}

	pds_vdpa_cmd_set_status(pdsv, status);

	if (status == 0) {
		struct vdpa_callback null_cb = { };

		pds_vdpa_set_config_cb(vdpa_dev, &null_cb);
		pds_vdpa_cmd_reset(pdsv);

		for (i = 0; i < pdsv->num_vqs; i++) {
			pdsv->vqs[i].avail_idx = 0;
			pdsv->vqs[i].used_idx = 0;
		}

		pds_vdpa_cmd_set_mac(pdsv, pdsv->mac);
	}

	if (status & ~old_status & VIRTIO_CONFIG_S_FEATURES_OK) {
		for (i = 0; i < pdsv->num_vqs; i++) {
			pdsv->vqs[i].notify =
				vp_modern_map_vq_notify(&pdsv->vdpa_aux->vd_mdev,
							i, &pdsv->vqs[i].notify_pa);
		}
	}

	if (old_status & ~status & VIRTIO_CONFIG_S_DRIVER_OK)
		pds_vdpa_release_irqs(pdsv);
}

static void pds_vdpa_init_vqs_entry(struct pds_vdpa_device *pdsv, int qid,
				    void __iomem *notify)
{
	memset(&pdsv->vqs[qid], 0, sizeof(pdsv->vqs[0]));
	pdsv->vqs[qid].qid = qid;
	pdsv->vqs[qid].pdsv = pdsv;
	pdsv->vqs[qid].ready = false;
	pdsv->vqs[qid].irq = VIRTIO_MSI_NO_VECTOR;
	pdsv->vqs[qid].notify = notify;
}

static int pds_vdpa_reset(struct vdpa_device *vdpa_dev)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct device *dev;
	int err = 0;
	u8 status;
	int i;

	dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
	status = pds_vdpa_get_status(vdpa_dev);

	if (status == 0)
		return 0;

	if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
		/* Reset the vqs */
		for (i = 0; i < pdsv->num_vqs && !err; i++) {
			err = pds_vdpa_cmd_reset_vq(pdsv, i, 0, &pdsv->vqs[i]);
			if (err)
				dev_err(dev, "%s: reset_vq failed qid %d: %pe\n",
					__func__, i, ERR_PTR(err));
		}
	}

	pds_vdpa_set_status(vdpa_dev, 0);

	if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
		/* Reset the vq info */
		for (i = 0; i < pdsv->num_vqs && !err; i++)
			pds_vdpa_init_vqs_entry(pdsv, i, pdsv->vqs[i].notify);
	}

	return 0;
}

static size_t pds_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
{
	return sizeof(struct virtio_net_config);
}

static void pds_vdpa_get_config(struct vdpa_device *vdpa_dev,
				unsigned int offset,
				void *buf, unsigned int len)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	void __iomem *device;

	if (offset + len > sizeof(struct virtio_net_config)) {
		WARN(true, "%s: bad read, offset %d len %d\n", __func__, offset, len);
		return;
	}

	device = pdsv->vdpa_aux->vd_mdev.device;
	memcpy_fromio(buf, device + offset, len);
}

static void pds_vdpa_set_config(struct vdpa_device *vdpa_dev,
				unsigned int offset, const void *buf,
				unsigned int len)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	void __iomem *device;

	if (offset + len > sizeof(struct virtio_net_config)) {
		WARN(true, "%s: bad read, offset %d len %d\n", __func__, offset, len);
		return;
	}

	device = pdsv->vdpa_aux->vd_mdev.device;
	memcpy_toio(device + offset, buf, len);
}

static const struct vdpa_config_ops pds_vdpa_ops = {
	.set_vq_address		= pds_vdpa_set_vq_address,
	.set_vq_num		= pds_vdpa_set_vq_num,
	.kick_vq		= pds_vdpa_kick_vq,
	.set_vq_cb		= pds_vdpa_set_vq_cb,
	.set_vq_ready		= pds_vdpa_set_vq_ready,
	.get_vq_ready		= pds_vdpa_get_vq_ready,
	.set_vq_state		= pds_vdpa_set_vq_state,
	.get_vq_state		= pds_vdpa_get_vq_state,
	.get_vq_notification	= pds_vdpa_get_vq_notification,
	.get_vq_irq		= pds_vdpa_get_vq_irq,
	.get_vq_align		= pds_vdpa_get_vq_align,
	.get_vq_group		= pds_vdpa_get_vq_group,

	.get_device_features	= pds_vdpa_get_device_features,
	.set_driver_features	= pds_vdpa_set_driver_features,
	.get_driver_features	= pds_vdpa_get_driver_features,
	.set_config_cb		= pds_vdpa_set_config_cb,
	.get_vq_num_max		= pds_vdpa_get_vq_num_max,
	.get_device_id		= pds_vdpa_get_device_id,
	.get_vendor_id		= pds_vdpa_get_vendor_id,
	.get_status		= pds_vdpa_get_status,
	.set_status		= pds_vdpa_set_status,
	.reset			= pds_vdpa_reset,
	.get_config_size	= pds_vdpa_get_config_size,
	.get_config		= pds_vdpa_get_config,
	.set_config		= pds_vdpa_set_config,
};
static struct virtio_device_id pds_vdpa_id_table[] = {
	{VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
	{0},
};

static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
			    const struct vdpa_dev_set_config *add_config)
{
	struct pds_vdpa_aux *vdpa_aux;
	struct pds_vdpa_device *pdsv;
	struct vdpa_mgmt_dev *mgmt;
	u16 fw_max_vqs, vq_pairs;
	struct device *dma_dev;
	struct pci_dev *pdev;
	struct device *dev;
	int err;
	int i;

	vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
	dev = &vdpa_aux->padev->aux_dev.dev;
	mgmt = &vdpa_aux->vdpa_mdev;

	if (vdpa_aux->pdsv) {
		dev_warn(dev, "Multiple vDPA devices on a VF is not supported.\n");
		return -EOPNOTSUPP;
	}

	pdsv = vdpa_alloc_device(struct pds_vdpa_device, vdpa_dev,
				 dev, &pds_vdpa_ops, 1, 1, name, false);
	if (IS_ERR(pdsv)) {
		dev_err(dev, "Failed to allocate vDPA structure: %pe\n", pdsv);
		return PTR_ERR(pdsv);
	}

	vdpa_aux->pdsv = pdsv;
	pdsv->vdpa_aux = vdpa_aux;

	pdev = vdpa_aux->padev->vf_pdev;
	dma_dev = &pdev->dev;
	pdsv->vdpa_dev.dma_dev = dma_dev;

	pdsv->supported_features = mgmt->supported_features;

	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
		u64 unsupp_features =
			add_config->device_features & ~pdsv->supported_features;

		if (unsupp_features) {
			dev_err(dev, "Unsupported features: %#llx\n", unsupp_features);
			err = -EOPNOTSUPP;
			goto err_unmap;
		}

		pdsv->supported_features = add_config->device_features;
	}

	err = pds_vdpa_cmd_reset(pdsv);
	if (err) {
		dev_err(dev, "Failed to reset hw: %pe\n", ERR_PTR(err));
		goto err_unmap;
	}

	err = pds_vdpa_init_hw(pdsv);
	if (err) {
		dev_err(dev, "Failed to init hw: %pe\n", ERR_PTR(err));
		goto err_unmap;
	}

	fw_max_vqs = le16_to_cpu(pdsv->vdpa_aux->ident.max_vqs);
	vq_pairs = fw_max_vqs / 2;

	/* Make sure we have the queues being requested */
	if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MAX_VQP))
		vq_pairs = add_config->net.max_vq_pairs;

	pdsv->num_vqs = 2 * vq_pairs;
	if (pdsv->supported_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
		pdsv->num_vqs++;

	if (pdsv->num_vqs > fw_max_vqs) {
		dev_err(dev, "%s: queue count requested %u greater than max %u\n",
			__func__, pdsv->num_vqs, fw_max_vqs);
		err = -ENOSPC;
		goto err_unmap;
	}

	if (pdsv->num_vqs != fw_max_vqs) {
		err = pds_vdpa_cmd_set_max_vq_pairs(pdsv, vq_pairs);
		if (err) {
			dev_err(dev, "Failed to set max_vq_pairs: %pe\n",
				ERR_PTR(err));
			goto err_unmap;
		}
	}

	/* Set a mac, either from the user config if provided
	 * or use the device's mac if not 00:..:00
	 * or set a random mac
	 */
	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
		ether_addr_copy(pdsv->mac, add_config->net.mac);
	} else {
		struct virtio_net_config __iomem *vc;

		vc = pdsv->vdpa_aux->vd_mdev.device;
		memcpy_fromio(pdsv->mac, vc->mac, sizeof(pdsv->mac));
		if (is_zero_ether_addr(pdsv->mac) &&
		    (pdsv->supported_features & BIT_ULL(VIRTIO_NET_F_MAC))) {
			eth_random_addr(pdsv->mac);
			dev_info(dev, "setting random mac %pM\n", pdsv->mac);
		}
	}
	pds_vdpa_cmd_set_mac(pdsv, pdsv->mac);

	for (i = 0; i < pdsv->num_vqs; i++) {
		void __iomem *notify;

		notify = vp_modern_map_vq_notify(&pdsv->vdpa_aux->vd_mdev,
						 i, &pdsv->vqs[i].notify_pa);
		pds_vdpa_init_vqs_entry(pdsv, i, notify);
	}

	pdsv->vdpa_dev.mdev = &vdpa_aux->vdpa_mdev;

	err = pds_vdpa_register_event_handler(pdsv);
	if (err) {
		dev_err(dev, "Failed to register for PDS events: %pe\n", ERR_PTR(err));
		goto err_unmap;
	}

	/* We use the _vdpa_register_device() call rather than the
	 * vdpa_register_device() to avoid a deadlock because our
	 * dev_add() is called with the vdpa_dev_lock already set
	 * by vdpa_nl_cmd_dev_add_set_doit()
	 */
	err = _vdpa_register_device(&pdsv->vdpa_dev, pdsv->num_vqs);
	if (err) {
		dev_err(dev, "Failed to register to vDPA bus: %pe\n", ERR_PTR(err));
		goto err_unevent;
	}

	pds_vdpa_debugfs_add_vdpadev(vdpa_aux);

	return 0;

err_unevent:
	pds_vdpa_unregister_event_handler(pdsv);
err_unmap:
	put_device(&pdsv->vdpa_dev.dev);
	vdpa_aux->pdsv = NULL;
	return err;
}

static void pds_vdpa_dev_del(struct vdpa_mgmt_dev *mdev,
			     struct vdpa_device *vdpa_dev)
{
	struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
	struct pds_vdpa_aux *vdpa_aux;

	pds_vdpa_unregister_event_handler(pdsv);

	vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
	_vdpa_unregister_device(vdpa_dev);

	pds_vdpa_cmd_reset(vdpa_aux->pdsv);
	pds_vdpa_debugfs_reset_vdpadev(vdpa_aux);

	vdpa_aux->pdsv = NULL;

	dev_info(&vdpa_aux->padev->aux_dev.dev, "Removed vdpa device\n");
}

static const struct vdpa_mgmtdev_ops pds_vdpa_mgmt_dev_ops = {
	.dev_add = pds_vdpa_dev_add,
	.dev_del = pds_vdpa_dev_del
};

int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux)
{
	union pds_core_adminq_cmd cmd = {
		.vdpa_ident.opcode = PDS_VDPA_CMD_IDENT,
		.vdpa_ident.vf_id = cpu_to_le16(vdpa_aux->vf_id),
	};
	union pds_core_adminq_comp comp = {};
	struct vdpa_mgmt_dev *mgmt;
	struct pci_dev *pf_pdev;
	struct device *pf_dev;
	struct pci_dev *pdev;
	dma_addr_t ident_pa;
	struct device *dev;
	u16 dev_intrs;
	u16 max_vqs;
	int err;

	dev = &vdpa_aux->padev->aux_dev.dev;
	pdev = vdpa_aux->padev->vf_pdev;
	mgmt = &vdpa_aux->vdpa_mdev;

	/* Get resource info through the PF's adminq.  It is a block of info,
	 * so we need to map some memory for PF to make available to the
	 * firmware for writing the data.
	 */
	pf_pdev = pci_physfn(vdpa_aux->padev->vf_pdev);
	pf_dev = &pf_pdev->dev;
	ident_pa = dma_map_single(pf_dev, &vdpa_aux->ident,
				  sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
	if (dma_mapping_error(pf_dev, ident_pa)) {
		dev_err(dev, "Failed to map ident space\n");
		return -ENOMEM;
	}

	cmd.vdpa_ident.ident_pa = cpu_to_le64(ident_pa);
	cmd.vdpa_ident.len = cpu_to_le32(sizeof(vdpa_aux->ident));
	err = pds_client_adminq_cmd(vdpa_aux->padev, &cmd,
				    sizeof(cmd.vdpa_ident), &comp, 0);
	dma_unmap_single(pf_dev, ident_pa,
			 sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
	if (err) {
		dev_err(dev, "Failed to ident hw, status %d: %pe\n",
			comp.status, ERR_PTR(err));
		return err;
	}

	max_vqs = le16_to_cpu(vdpa_aux->ident.max_vqs);
	dev_intrs = pci_msix_vec_count(pdev);
	dev_dbg(dev, "ident.max_vqs %d dev_intrs %d\n", max_vqs, dev_intrs);

	max_vqs = min_t(u16, dev_intrs, max_vqs);
	mgmt->max_supported_vqs = min_t(u16, PDS_VDPA_MAX_QUEUES, max_vqs);
	vdpa_aux->nintrs = 0;

	mgmt->ops = &pds_vdpa_mgmt_dev_ops;
	mgmt->id_table = pds_vdpa_id_table;
	mgmt->device = dev;
	mgmt->supported_features = le64_to_cpu(vdpa_aux->ident.hw_features);

	/* advertise F_MAC even if the device doesn't */
	mgmt->supported_features |= BIT_ULL(VIRTIO_NET_F_MAC);

	mgmt->config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
	mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
	mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);

	return 0;
}