summaryrefslogtreecommitdiff
path: root/drivers/scsi/snic/vnic_dev.c
blob: 760f3f22095c4c690b2b59fb3739c647a2fa453a (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
// SPDX-License-Identifier: GPL-2.0-only
// Copyright 2014 Cisco Systems, Inc.  All rights reserved.

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/slab.h>
#include "vnic_resource.h"
#include "vnic_devcmd.h"
#include "vnic_dev.h"
#include "vnic_stats.h"
#include "vnic_wq.h"

#define VNIC_DVCMD_TMO	10000	/* Devcmd Timeout value */
#define VNIC_NOTIFY_INTR_MASK 0x0000ffff00000000ULL

struct devcmd2_controller {
	struct vnic_wq_ctrl __iomem *wq_ctrl;
	struct vnic_dev_ring results_ring;
	struct vnic_wq wq;
	struct vnic_devcmd2 *cmd_ring;
	struct devcmd2_result *result;
	u16 next_result;
	u16 result_size;
	int color;
};

struct vnic_res {
	void __iomem *vaddr;
	unsigned int count;
};

struct vnic_dev {
	void *priv;
	struct pci_dev *pdev;
	struct vnic_res res[RES_TYPE_MAX];
	enum vnic_dev_intr_mode intr_mode;
	struct vnic_devcmd __iomem *devcmd;
	struct vnic_devcmd_notify *notify;
	struct vnic_devcmd_notify notify_copy;
	dma_addr_t notify_pa;
	u32 *linkstatus;
	dma_addr_t linkstatus_pa;
	struct vnic_stats *stats;
	dma_addr_t stats_pa;
	struct vnic_devcmd_fw_info *fw_info;
	dma_addr_t fw_info_pa;
	u64 args[VNIC_DEVCMD_NARGS];
	struct devcmd2_controller *devcmd2;

	int (*devcmd_rtn)(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
			  int wait);
};

#define VNIC_MAX_RES_HDR_SIZE \
	(sizeof(struct vnic_resource_header) + \
	sizeof(struct vnic_resource) * RES_TYPE_MAX)
#define VNIC_RES_STRIDE	128

void *svnic_dev_priv(struct vnic_dev *vdev)
{
	return vdev->priv;
}

static int vnic_dev_discover_res(struct vnic_dev *vdev,
	struct vnic_dev_bar *bar, unsigned int num_bars)
{
	struct vnic_resource_header __iomem *rh;
	struct vnic_resource __iomem *r;
	u8 type;

	if (num_bars == 0)
		return -EINVAL;

	if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
		pr_err("vNIC BAR0 res hdr length error\n");

		return -EINVAL;
	}

	rh = bar->vaddr;
	if (!rh) {
		pr_err("vNIC BAR0 res hdr not mem-mapped\n");

		return -EINVAL;
	}

	if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
	    ioread32(&rh->version) != VNIC_RES_VERSION) {
		pr_err("vNIC BAR0 res magic/version error exp (%lx/%lx) curr (%x/%x)\n",
			VNIC_RES_MAGIC, VNIC_RES_VERSION,
			ioread32(&rh->magic), ioread32(&rh->version));

		return -EINVAL;
	}

	r = (struct vnic_resource __iomem *)(rh + 1);

	while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {

		u8 bar_num = ioread8(&r->bar);
		u32 bar_offset = ioread32(&r->bar_offset);
		u32 count = ioread32(&r->count);
		u32 len;

		r++;

		if (bar_num >= num_bars)
			continue;

		if (!bar[bar_num].len || !bar[bar_num].vaddr)
			continue;

		switch (type) {
		case RES_TYPE_WQ:
		case RES_TYPE_RQ:
		case RES_TYPE_CQ:
		case RES_TYPE_INTR_CTRL:
			/* each count is stride bytes long */
			len = count * VNIC_RES_STRIDE;
			if (len + bar_offset > bar->len) {
				pr_err("vNIC BAR0 resource %d out-of-bounds, offset 0x%x + size 0x%x > bar len 0x%lx\n",
					type, bar_offset,
					len,
					bar->len);

				return -EINVAL;
			}
			break;

		case RES_TYPE_INTR_PBA_LEGACY:
		case RES_TYPE_DEVCMD:
		case RES_TYPE_DEVCMD2:
			len = count;
			break;

		default:
			continue;
		}

		vdev->res[type].count = count;
		vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
	}

	return 0;
}

unsigned int svnic_dev_get_res_count(struct vnic_dev *vdev,
	enum vnic_res_type type)
{
	return vdev->res[type].count;
}

void __iomem *svnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
	unsigned int index)
{
	if (!vdev->res[type].vaddr)
		return NULL;

	switch (type) {
	case RES_TYPE_WQ:
	case RES_TYPE_RQ:
	case RES_TYPE_CQ:
	case RES_TYPE_INTR_CTRL:
		return (char __iomem *)vdev->res[type].vaddr +
					index * VNIC_RES_STRIDE;

	default:
		return (char __iomem *)vdev->res[type].vaddr;
	}
}

unsigned int svnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
				      unsigned int desc_count,
				      unsigned int desc_size)
{
	/* The base address of the desc rings must be 512 byte aligned.
	 * Descriptor count is aligned to groups of 32 descriptors.  A
	 * count of 0 means the maximum 4096 descriptors.  Descriptor
	 * size is aligned to 16 bytes.
	 */

	unsigned int count_align = 32;
	unsigned int desc_align = 16;

	ring->base_align = 512;

	if (desc_count == 0)
		desc_count = 4096;

	ring->desc_count = ALIGN(desc_count, count_align);

	ring->desc_size = ALIGN(desc_size, desc_align);

	ring->size = ring->desc_count * ring->desc_size;
	ring->size_unaligned = ring->size + ring->base_align;

	return ring->size_unaligned;
}

void svnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
{
	memset(ring->descs, 0, ring->size);
}

int svnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
	unsigned int desc_count, unsigned int desc_size)
{
	svnic_dev_desc_ring_size(ring, desc_count, desc_size);

	ring->descs_unaligned = dma_alloc_coherent(&vdev->pdev->dev,
			ring->size_unaligned, &ring->base_addr_unaligned,
			GFP_KERNEL);
	if (!ring->descs_unaligned) {
		pr_err("Failed to allocate ring (size=%d), aborting\n",
			(int)ring->size);

		return -ENOMEM;
	}

	ring->base_addr = ALIGN(ring->base_addr_unaligned,
		ring->base_align);
	ring->descs = (u8 *)ring->descs_unaligned +
		(ring->base_addr - ring->base_addr_unaligned);

	svnic_dev_clear_desc_ring(ring);

	ring->desc_avail = ring->desc_count - 1;

	return 0;
}

void svnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
{
	if (ring->descs) {
		dma_free_coherent(&vdev->pdev->dev,
			ring->size_unaligned,
			ring->descs_unaligned,
			ring->base_addr_unaligned);
		ring->descs = NULL;
	}
}

static int _svnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
	int wait)
{
	struct devcmd2_controller *dc2c = vdev->devcmd2;
	struct devcmd2_result *result = NULL;
	unsigned int i;
	int delay;
	int err;
	u32 posted;
	u32 fetch_idx;
	u32 new_posted;
	u8 color;

	fetch_idx = ioread32(&dc2c->wq_ctrl->fetch_index);
	if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
		/* Hardware surprise removal: return error */
		return -ENODEV;
	}

	posted = ioread32(&dc2c->wq_ctrl->posted_index);

	if (posted == 0xFFFFFFFF) { /* check for hardware gone  */
		/* Hardware surprise removal: return error */
		return -ENODEV;
	}

	new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
	if (new_posted == fetch_idx) {
		pr_err("%s: wq is full while issuing devcmd2 command %d, fetch index: %u, posted index: %u\n",
			pci_name(vdev->pdev), _CMD_N(cmd), fetch_idx, posted);

		return -EBUSY;
	}

	dc2c->cmd_ring[posted].cmd = cmd;
	dc2c->cmd_ring[posted].flags = 0;

	if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
		dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;

	if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
		for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
			dc2c->cmd_ring[posted].args[i] = vdev->args[i];
	}
	/* Adding write memory barrier prevents compiler and/or CPU
	 * reordering, thus avoiding descriptor posting before
	 * descriptor is initialized. Otherwise, hardware can read
	 * stale descriptor fields.
	 */
	wmb();
	iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);

	if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
		return 0;

	result = dc2c->result + dc2c->next_result;
	color = dc2c->color;

	/*
	 * Increment next_result, after posting the devcmd, irrespective of
	 * devcmd result, and it should be done only once.
	 */
	dc2c->next_result++;
	if (dc2c->next_result == dc2c->result_size) {
		dc2c->next_result = 0;
		dc2c->color = dc2c->color ? 0 : 1;
	}

	for (delay = 0; delay < wait; delay++) {
		udelay(100);
		if (result->color == color) {
			if (result->error) {
				err = (int) result->error;
				if (err != ERR_ECMDUNKNOWN ||
				    cmd != CMD_CAPABILITY)
					pr_err("Error %d devcmd %d\n",
						err, _CMD_N(cmd));

				return err;
			}
			if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
				for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
					vdev->args[i] = result->results[i];
			}

			return 0;
		}
	}

	pr_err("Timed out devcmd %d\n", _CMD_N(cmd));

	return -ETIMEDOUT;
}

static int svnic_dev_init_devcmd2(struct vnic_dev *vdev)
{
	struct devcmd2_controller *dc2c = NULL;
	unsigned int fetch_idx;
	int ret;
	void __iomem *p;

	if (vdev->devcmd2)
		return 0;

	p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
	if (!p)
		return -ENODEV;

	dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC);
	if (!dc2c)
		return -ENOMEM;

	vdev->devcmd2 = dc2c;

	dc2c->color = 1;
	dc2c->result_size = DEVCMD2_RING_SIZE;

	ret  = vnic_wq_devcmd2_alloc(vdev,
				     &dc2c->wq,
				     DEVCMD2_RING_SIZE,
				     DEVCMD2_DESC_SIZE);
	if (ret)
		goto err_free_devcmd2;

	fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index);
	if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
		/* Hardware surprise removal: reset fetch_index */
		fetch_idx = 0;
	}

	/*
	 * Don't change fetch_index ever and
	 * set posted_index same as fetch_index
	 * when setting up the WQ for devcmd2.
	 */
	vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0);
	svnic_wq_enable(&dc2c->wq);
	ret = svnic_dev_alloc_desc_ring(vdev,
					&dc2c->results_ring,
					DEVCMD2_RING_SIZE,
					DEVCMD2_DESC_SIZE);
	if (ret)
		goto err_free_wq;

	dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs;
	dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs;
	dc2c->wq_ctrl = dc2c->wq.ctrl;
	vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET;
	vdev->args[1] = DEVCMD2_RING_SIZE;

	ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO);
	if (ret < 0)
		goto err_free_desc_ring;

	vdev->devcmd_rtn = &_svnic_dev_cmd2;
	pr_info("DEVCMD2 Initialized.\n");

	return ret;

err_free_desc_ring:
	svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);

err_free_wq:
	svnic_wq_disable(&dc2c->wq);
	svnic_wq_free(&dc2c->wq);

err_free_devcmd2:
	kfree(dc2c);
	vdev->devcmd2 = NULL;

	return ret;
} /* end of svnic_dev_init_devcmd2 */

static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
{
	struct devcmd2_controller *dc2c = vdev->devcmd2;

	vdev->devcmd2 = NULL;
	vdev->devcmd_rtn = NULL;

	svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
	svnic_wq_disable(&dc2c->wq);
	svnic_wq_free(&dc2c->wq);
	kfree(dc2c);
}

int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
	u64 *a0, u64 *a1, int wait)
{
	int err;

	memset(vdev->args, 0, sizeof(vdev->args));
	vdev->args[0] = *a0;
	vdev->args[1] = *a1;

	err = (*vdev->devcmd_rtn)(vdev, cmd, wait);

	*a0 = vdev->args[0];
	*a1 = vdev->args[1];

	return  err;
}

int svnic_dev_fw_info(struct vnic_dev *vdev,
	struct vnic_devcmd_fw_info **fw_info)
{
	u64 a0, a1 = 0;
	int wait = VNIC_DVCMD_TMO;
	int err = 0;

	if (!vdev->fw_info) {
		vdev->fw_info = dma_alloc_coherent(&vdev->pdev->dev,
			sizeof(struct vnic_devcmd_fw_info),
			&vdev->fw_info_pa, GFP_KERNEL);
		if (!vdev->fw_info)
			return -ENOMEM;

		a0 = vdev->fw_info_pa;

		/* only get fw_info once and cache it */
		err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
	}

	*fw_info = vdev->fw_info;

	return err;
}

int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset,
	unsigned int size, void *value)
{
	u64 a0, a1;
	int wait = VNIC_DVCMD_TMO;
	int err;

	a0 = offset;
	a1 = size;

	err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);

	switch (size) {
	case 1:
		*(u8 *)value = (u8)a0;
		break;
	case 2:
		*(u16 *)value = (u16)a0;
		break;
	case 4:
		*(u32 *)value = (u32)a0;
		break;
	case 8:
		*(u64 *)value = a0;
		break;
	default:
		BUG();
		break;
	}

	return err;
}

int svnic_dev_stats_clear(struct vnic_dev *vdev)
{
	u64 a0 = 0, a1 = 0;
	int wait = VNIC_DVCMD_TMO;

	return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
}

int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
{
	u64 a0, a1;
	int wait = VNIC_DVCMD_TMO;

	if (!vdev->stats) {
		vdev->stats = dma_alloc_coherent(&vdev->pdev->dev,
			sizeof(struct vnic_stats), &vdev->stats_pa, GFP_KERNEL);
		if (!vdev->stats)
			return -ENOMEM;
	}

	*stats = vdev->stats;
	a0 = vdev->stats_pa;
	a1 = sizeof(struct vnic_stats);

	return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
}

int svnic_dev_close(struct vnic_dev *vdev)
{
	u64 a0 = 0, a1 = 0;
	int wait = VNIC_DVCMD_TMO;

	return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
}

int svnic_dev_enable_wait(struct vnic_dev *vdev)
{
	u64 a0 = 0, a1 = 0;
	int wait = VNIC_DVCMD_TMO;
	int err = 0;

	err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
	if (err == ERR_ECMDUNKNOWN)
		return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);

	return err;
}

int svnic_dev_disable(struct vnic_dev *vdev)
{
	u64 a0 = 0, a1 = 0;
	int wait = VNIC_DVCMD_TMO;

	return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
}

int svnic_dev_open(struct vnic_dev *vdev, int arg)
{
	u64 a0 = (u32)arg, a1 = 0;
	int wait = VNIC_DVCMD_TMO;

	return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
}

int svnic_dev_open_done(struct vnic_dev *vdev, int *done)
{
	u64 a0 = 0, a1 = 0;
	int wait = VNIC_DVCMD_TMO;
	int err;

	*done = 0;

	err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
	if (err)
		return err;

	*done = (a0 == 0);

	return 0;
}

int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
{
	u64 a0, a1;
	int wait = VNIC_DVCMD_TMO;

	if (!vdev->notify) {
		vdev->notify = dma_alloc_coherent(&vdev->pdev->dev,
			sizeof(struct vnic_devcmd_notify),
			&vdev->notify_pa, GFP_KERNEL);
		if (!vdev->notify)
			return -ENOMEM;
	}

	a0 = vdev->notify_pa;
	a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK;
	a1 += sizeof(struct vnic_devcmd_notify);

	return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
}

void svnic_dev_notify_unset(struct vnic_dev *vdev)
{
	u64 a0, a1;
	int wait = VNIC_DVCMD_TMO;

	a0 = 0;  /* paddr = 0 to unset notify buffer */
	a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */
	a1 += sizeof(struct vnic_devcmd_notify);

	svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
}

static int vnic_dev_notify_ready(struct vnic_dev *vdev)
{
	u32 *words;
	unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
	unsigned int i;
	u32 csum;

	if (!vdev->notify)
		return 0;

	do {
		csum = 0;
		memcpy(&vdev->notify_copy, vdev->notify,
			sizeof(struct vnic_devcmd_notify));
		words = (u32 *)&vdev->notify_copy;
		for (i = 1; i < nwords; i++)
			csum += words[i];
	} while (csum != words[0]);

	return 1;
}

int svnic_dev_init(struct vnic_dev *vdev, int arg)
{
	u64 a0 = (u32)arg, a1 = 0;
	int wait = VNIC_DVCMD_TMO;

	return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
}

int svnic_dev_link_status(struct vnic_dev *vdev)
{
	if (vdev->linkstatus)
		return *vdev->linkstatus;

	if (!vnic_dev_notify_ready(vdev))
		return 0;

	return vdev->notify_copy.link_state;
}

u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev)
{
	if (!vnic_dev_notify_ready(vdev))
		return 0;

	return vdev->notify_copy.link_down_cnt;
}

void svnic_dev_set_intr_mode(struct vnic_dev *vdev,
	enum vnic_dev_intr_mode intr_mode)
{
	vdev->intr_mode = intr_mode;
}

enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev)
{
	return vdev->intr_mode;
}

void svnic_dev_unregister(struct vnic_dev *vdev)
{
	if (vdev) {
		if (vdev->notify)
			dma_free_coherent(&vdev->pdev->dev,
				sizeof(struct vnic_devcmd_notify),
				vdev->notify,
				vdev->notify_pa);
		if (vdev->linkstatus)
			dma_free_coherent(&vdev->pdev->dev,
				sizeof(u32),
				vdev->linkstatus,
				vdev->linkstatus_pa);
		if (vdev->stats)
			dma_free_coherent(&vdev->pdev->dev,
				sizeof(struct vnic_stats),
				vdev->stats, vdev->stats_pa);
		if (vdev->fw_info)
			dma_free_coherent(&vdev->pdev->dev,
				sizeof(struct vnic_devcmd_fw_info),
				vdev->fw_info, vdev->fw_info_pa);
		if (vdev->devcmd2)
			vnic_dev_deinit_devcmd2(vdev);
		kfree(vdev);
	}
}

struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev,
					  void *priv,
					  struct pci_dev *pdev,
					  struct vnic_dev_bar *bar,
					  unsigned int num_bars)
{
	if (!vdev) {
		vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
		if (!vdev)
			return NULL;
	}

	vdev->priv = priv;
	vdev->pdev = pdev;

	if (vnic_dev_discover_res(vdev, bar, num_bars))
		goto err_out;

	return vdev;

err_out:
	svnic_dev_unregister(vdev);

	return NULL;
} /* end of svnic_dev_alloc_discover */

/*
 * fallback option is left to keep the interface common for other vnics.
 */
int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback)
{
	int err = -ENODEV;
	void __iomem *p;

	p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
	if (p)
		err = svnic_dev_init_devcmd2(vdev);
	else
		pr_err("DEVCMD2 resource not found.\n");

	return err;
} /* end of svnic_dev_cmd_init */