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snic: driver for Cisco SCSI HBA
[deliverable/linux.git] / drivers / scsi / snic / vnic_dev.c
CommitLineData
c8806b6c
NM		 1/*
2 * Copyright 2014 Cisco Systems, Inc. All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18#include <linux/kernel.h>
19#include <linux/errno.h>
20#include <linux/types.h>
21#include <linux/pci.h>
22#include <linux/delay.h>
23#include <linux/if_ether.h>
24#include <linux/slab.h>
25#include "vnic_resource.h"
26#include "vnic_devcmd.h"
27#include "vnic_dev.h"
28#include "vnic_stats.h"
29#include "vnic_wq.h"
30
31#define VNIC_DVCMD_TMO 10000 /* Devcmd Timeout value */
32#define VNIC_NOTIFY_INTR_MASK 0x0000ffff00000000ULL
33
34struct devcmd2_controller {
35 struct vnic_wq_ctrl __iomem *wq_ctrl;
36 struct vnic_dev_ring results_ring;
37 struct vnic_wq wq;
38 struct vnic_devcmd2 *cmd_ring;
39 struct devcmd2_result *result;
40 u16 next_result;
41 u16 result_size;
42 int color;
43};
44
45struct vnic_res {
46 void __iomem *vaddr;
47 unsigned int count;
48};
49
50struct vnic_dev {
51 void *priv;
52 struct pci_dev *pdev;
53 struct vnic_res res[RES_TYPE_MAX];
54 enum vnic_dev_intr_mode intr_mode;
55 struct vnic_devcmd __iomem *devcmd;
56 struct vnic_devcmd_notify *notify;
57 struct vnic_devcmd_notify notify_copy;
58 dma_addr_t notify_pa;
59 u32 *linkstatus;
60 dma_addr_t linkstatus_pa;
61 struct vnic_stats *stats;
62 dma_addr_t stats_pa;
63 struct vnic_devcmd_fw_info *fw_info;
64 dma_addr_t fw_info_pa;
65 u64 args[VNIC_DEVCMD_NARGS];
66 struct devcmd2_controller *devcmd2;
67
68 int (*devcmd_rtn)(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
69 int wait);
70};
71
72#define VNIC_MAX_RES_HDR_SIZE \
73 (sizeof(struct vnic_resource_header) + \
74 sizeof(struct vnic_resource) * RES_TYPE_MAX)
75#define VNIC_RES_STRIDE 128
76
77void *svnic_dev_priv(struct vnic_dev *vdev)
78{
79 return vdev->priv;
80}
81
82static int vnic_dev_discover_res(struct vnic_dev *vdev,
83 struct vnic_dev_bar *bar, unsigned int num_bars)
84{
85 struct vnic_resource_header __iomem *rh;
86 struct vnic_resource __iomem *r;
87 u8 type;
88
89 if (num_bars == 0)
90 return -EINVAL;
91
92 if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
93 pr_err("vNIC BAR0 res hdr length error\n");
94
95 return -EINVAL;
96 }
97
98 rh = bar->vaddr;
99 if (!rh) {
100 pr_err("vNIC BAR0 res hdr not mem-mapped\n");
101
102 return -EINVAL;
103 }
104
105 if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
106 ioread32(&rh->version) != VNIC_RES_VERSION) {
107 pr_err("vNIC BAR0 res magic/version error exp (%lx/%lx) curr (%x/%x)\n",
108 VNIC_RES_MAGIC, VNIC_RES_VERSION,
109 ioread32(&rh->magic), ioread32(&rh->version));
110
111 return -EINVAL;
112 }
113
114 r = (struct vnic_resource __iomem *)(rh + 1);
115
116 while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {
117
118 u8 bar_num = ioread8(&r->bar);
119 u32 bar_offset = ioread32(&r->bar_offset);
120 u32 count = ioread32(&r->count);
121 u32 len;
122
123 r++;
124
125 if (bar_num >= num_bars)
126 continue;
127
128 if (!bar[bar_num].len || !bar[bar_num].vaddr)
129 continue;
130
131 switch (type) {
132 case RES_TYPE_WQ:
133 case RES_TYPE_RQ:
134 case RES_TYPE_CQ:
135 case RES_TYPE_INTR_CTRL:
136 /* each count is stride bytes long */
137 len = count * VNIC_RES_STRIDE;
138 if (len + bar_offset > bar->len) {
139 pr_err("vNIC BAR0 resource %d out-of-bounds, offset 0x%x + size 0x%x > bar len 0x%lx\n",
140 type, bar_offset,
141 len,
142 bar->len);
143
144 return -EINVAL;
145 }
146 break;
147
148 case RES_TYPE_INTR_PBA_LEGACY:
149 case RES_TYPE_DEVCMD:
150 case RES_TYPE_DEVCMD2:
151 len = count;
152 break;
153
154 default:
155 continue;
156 }
157
158 vdev->res[type].count = count;
159 vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
160 }
161
162 return 0;
163}
164
165unsigned int svnic_dev_get_res_count(struct vnic_dev *vdev,
166 enum vnic_res_type type)
167{
168 return vdev->res[type].count;
169}
170
171void __iomem *svnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
172 unsigned int index)
173{
174 if (!vdev->res[type].vaddr)
175 return NULL;
176
177 switch (type) {
178 case RES_TYPE_WQ:
179 case RES_TYPE_RQ:
180 case RES_TYPE_CQ:
181 case RES_TYPE_INTR_CTRL:
182 return (char __iomem *)vdev->res[type].vaddr +
183 index * VNIC_RES_STRIDE;
184
185 default:
186 return (char __iomem *)vdev->res[type].vaddr;
187 }
188}
189
190unsigned int svnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
191 unsigned int desc_count,
192 unsigned int desc_size)
193{
194 /* The base address of the desc rings must be 512 byte aligned.
195 * Descriptor count is aligned to groups of 32 descriptors. A
196 * count of 0 means the maximum 4096 descriptors. Descriptor
197 * size is aligned to 16 bytes.
198 */
199
200 unsigned int count_align = 32;
201 unsigned int desc_align = 16;
202
203 ring->base_align = 512;
204
205 if (desc_count == 0)
206 desc_count = 4096;
207
208 ring->desc_count = ALIGN(desc_count, count_align);
209
210 ring->desc_size = ALIGN(desc_size, desc_align);
211
212 ring->size = ring->desc_count * ring->desc_size;
213 ring->size_unaligned = ring->size + ring->base_align;
214
215 return ring->size_unaligned;
216}
217
218void svnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
219{
220 memset(ring->descs, 0, ring->size);
221}
222
223int svnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
224 unsigned int desc_count, unsigned int desc_size)
225{
226 svnic_dev_desc_ring_size(ring, desc_count, desc_size);
227
228 ring->descs_unaligned = pci_alloc_consistent(vdev->pdev,
229 ring->size_unaligned,
230 &ring->base_addr_unaligned);
231
232 if (!ring->descs_unaligned) {
233 pr_err("Failed to allocate ring (size=%d), aborting\n",
234 (int)ring->size);
235
236 return -ENOMEM;
237 }
238
239 ring->base_addr = ALIGN(ring->base_addr_unaligned,
240 ring->base_align);
241 ring->descs = (u8 *)ring->descs_unaligned +
242 (ring->base_addr - ring->base_addr_unaligned);
243
244 svnic_dev_clear_desc_ring(ring);
245
246 ring->desc_avail = ring->desc_count - 1;
247
248 return 0;
249}
250
251void svnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
252{
253 if (ring->descs) {
254 pci_free_consistent(vdev->pdev,
255 ring->size_unaligned,
256 ring->descs_unaligned,
257 ring->base_addr_unaligned);
258 ring->descs = NULL;
259 }
260}
261
262static int _svnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
263 int wait)
264{
265 struct devcmd2_controller *dc2c = vdev->devcmd2;
266 struct devcmd2_result *result = dc2c->result + dc2c->next_result;
267 unsigned int i;
268 int delay;
269 int err;
270 u32 posted;
271 u32 new_posted;
272
273 posted = ioread32(&dc2c->wq_ctrl->posted_index);
274
275 if (posted == 0xFFFFFFFF) { /* check for hardware gone */
276 /* Hardware surprise removal: return error */
277 return -ENODEV;
278 }
279
280 new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
281 dc2c->cmd_ring[posted].cmd = cmd;
282 dc2c->cmd_ring[posted].flags = 0;
283
284 if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
285 dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;
286
287 if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
288 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
289 dc2c->cmd_ring[posted].args[i] = vdev->args[i];
290 }
291 /* Adding write memory barrier prevents compiler and/or CPU
292 * reordering, thus avoiding descriptor posting before
293 * descriptor is initialized. Otherwise, hardware can read
294 * stale descriptor fields.
295 */
296 wmb();
297 iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);
298
299 if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
300 return 0;
301
302 for (delay = 0; delay < wait; delay++) {
303 udelay(100);
304 if (result->color == dc2c->color) {
305 dc2c->next_result++;
306 if (dc2c->next_result == dc2c->result_size) {
307 dc2c->next_result = 0;
308 dc2c->color = dc2c->color ? 0 : 1;
309 }
310 if (result->error) {
311 err = (int) result->error;
312 if (err != ERR_ECMDUNKNOWN ||
313 cmd != CMD_CAPABILITY)
314 pr_err("Error %d devcmd %d\n",
315 err, _CMD_N(cmd));
316
317 return err;
318 }
319 if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
320 /*
321 * Adding the rmb() prevents the compiler
322 * and/or CPU from reordering the reads which
323 * would potentially result in reading stale
324 * values.
325 */
326 rmb();
327 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
328 vdev->args[i] = result->results[i];
329 }
330
331 return 0;
332 }
333 }
334
335 pr_err("Timed out devcmd %d\n", _CMD_N(cmd));
336
337 return -ETIMEDOUT;
338}
339
340static int svnic_dev_init_devcmd2(struct vnic_dev *vdev)
341{
342 struct devcmd2_controller *dc2c = NULL;
343 unsigned int fetch_idx;
344 int ret;
345 void __iomem *p;
346
347 if (vdev->devcmd2)
348 return 0;
349
350 p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
351 if (!p)
352 return -ENODEV;
353
354 dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC);
355 if (!dc2c)
356 return -ENOMEM;
357
358 vdev->devcmd2 = dc2c;
359
360 dc2c->color = 1;
361 dc2c->result_size = DEVCMD2_RING_SIZE;
362
363 ret = vnic_wq_devcmd2_alloc(vdev,
364 &dc2c->wq,
365 DEVCMD2_RING_SIZE,
366 DEVCMD2_DESC_SIZE);
367 if (ret)
368 goto err_free_devcmd2;
369
370 fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index);
371 if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone */
372 /* Hardware surprise removal: reset fetch_index */
373 fetch_idx = 0;
374 }
375
376 /*
377 * Don't change fetch_index ever and
378 * set posted_index same as fetch_index
379 * when setting up the WQ for devcmd2.
380 */
381 vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0);
382 svnic_wq_enable(&dc2c->wq);
383 ret = svnic_dev_alloc_desc_ring(vdev,
384 &dc2c->results_ring,
385 DEVCMD2_RING_SIZE,
386 DEVCMD2_DESC_SIZE);
387 if (ret)
388 goto err_free_wq;
389
390 dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs;
391 dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs;
392 dc2c->wq_ctrl = dc2c->wq.ctrl;
393 vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET;
394 vdev->args[1] = DEVCMD2_RING_SIZE;
395
396 ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO);
397 if (ret < 0)
398 goto err_free_desc_ring;
399
400 vdev->devcmd_rtn = &_svnic_dev_cmd2;
401 pr_info("DEVCMD2 Initialized.\n");
402
403 return ret;
404
405err_free_desc_ring:
406 svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
407
408err_free_wq:
409 svnic_wq_disable(&dc2c->wq);
410 svnic_wq_free(&dc2c->wq);
411
412err_free_devcmd2:
413 kfree(dc2c);
414 vdev->devcmd2 = NULL;
415
416 return ret;
417} /* end of svnic_dev_init_devcmd2 */
418
419static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
420{
421 struct devcmd2_controller *dc2c = vdev->devcmd2;
422
423 vdev->devcmd2 = NULL;
424 vdev->devcmd_rtn = NULL;
425
426 svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
427 svnic_wq_disable(&dc2c->wq);
428 svnic_wq_free(&dc2c->wq);
429 kfree(dc2c);
430}
431
432int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
433 u64 *a0, u64 *a1, int wait)
434{
435 int err;
436
437 memset(vdev->args, 0, sizeof(vdev->args));
438 vdev->args[0] = *a0;
439 vdev->args[1] = *a1;
440
441 err = (*vdev->devcmd_rtn)(vdev, cmd, wait);
442
443 *a0 = vdev->args[0];
444 *a1 = vdev->args[1];
445
446 return err;
447}
448
449int svnic_dev_fw_info(struct vnic_dev *vdev,
450 struct vnic_devcmd_fw_info **fw_info)
451{
452 u64 a0, a1 = 0;
453 int wait = VNIC_DVCMD_TMO;
454 int err = 0;
455
456 if (!vdev->fw_info) {
457 vdev->fw_info = pci_alloc_consistent(vdev->pdev,
458 sizeof(struct vnic_devcmd_fw_info),
459 &vdev->fw_info_pa);
460 if (!vdev->fw_info)
461 return -ENOMEM;
462
463 a0 = vdev->fw_info_pa;
464
465 /* only get fw_info once and cache it */
466 err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
467 }
468
469 *fw_info = vdev->fw_info;
470
471 return err;
472}
473
474int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset,
475 unsigned int size, void *value)
476{
477 u64 a0, a1;
478 int wait = VNIC_DVCMD_TMO;
479 int err;
480
481 a0 = offset;
482 a1 = size;
483
484 err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
485
486 switch (size) {
487 case 1:
488 *(u8 *)value = (u8)a0;
489 break;
490 case 2:
491 *(u16 *)value = (u16)a0;
492 break;
493 case 4:
494 *(u32 *)value = (u32)a0;
495 break;
496 case 8:
497 *(u64 *)value = a0;
498 break;
499 default:
500 BUG();
501 break;
502 }
503
504 return err;
505}
506
507int svnic_dev_stats_clear(struct vnic_dev *vdev)
508{
509 u64 a0 = 0, a1 = 0;
510 int wait = VNIC_DVCMD_TMO;
511
512 return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
513}
514
515int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
516{
517 u64 a0, a1;
518 int wait = VNIC_DVCMD_TMO;
519
520 if (!vdev->stats) {
521 vdev->stats = pci_alloc_consistent(vdev->pdev,
522 sizeof(struct vnic_stats), &vdev->stats_pa);
523 if (!vdev->stats)
524 return -ENOMEM;
525 }
526
527 *stats = vdev->stats;
528 a0 = vdev->stats_pa;
529 a1 = sizeof(struct vnic_stats);
530
531 return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
532}
533
534int svnic_dev_close(struct vnic_dev *vdev)
535{
536 u64 a0 = 0, a1 = 0;
537 int wait = VNIC_DVCMD_TMO;
538
539 return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
540}
541
542int svnic_dev_enable_wait(struct vnic_dev *vdev)
543{
544 u64 a0 = 0, a1 = 0;
545 int wait = VNIC_DVCMD_TMO;
546 int err = 0;
547
548 err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
549 if (err == ERR_ECMDUNKNOWN)
550 return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
551
552 return err;
553}
554
555int svnic_dev_disable(struct vnic_dev *vdev)
556{
557 u64 a0 = 0, a1 = 0;
558 int wait = VNIC_DVCMD_TMO;
559
560 return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
561}
562
563int svnic_dev_open(struct vnic_dev *vdev, int arg)
564{
565 u64 a0 = (u32)arg, a1 = 0;
566 int wait = VNIC_DVCMD_TMO;
567
568 return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
569}
570
571int svnic_dev_open_done(struct vnic_dev *vdev, int *done)
572{
573 u64 a0 = 0, a1 = 0;
574 int wait = VNIC_DVCMD_TMO;
575 int err;
576
577 *done = 0;
578
579 err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
580 if (err)
581 return err;
582
583 *done = (a0 == 0);
584
585 return 0;
586}
587
588int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
589{
590 u64 a0, a1;
591 int wait = VNIC_DVCMD_TMO;
592
593 if (!vdev->notify) {
594 vdev->notify = pci_alloc_consistent(vdev->pdev,
595 sizeof(struct vnic_devcmd_notify),
596 &vdev->notify_pa);
597 if (!vdev->notify)
598 return -ENOMEM;
599 }
600
601 a0 = vdev->notify_pa;
602 a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK;
603 a1 += sizeof(struct vnic_devcmd_notify);
604
605 return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
606}
607
608void svnic_dev_notify_unset(struct vnic_dev *vdev)
609{
610 u64 a0, a1;
611 int wait = VNIC_DVCMD_TMO;
612
613 a0 = 0; /* paddr = 0 to unset notify buffer */
614 a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */
615 a1 += sizeof(struct vnic_devcmd_notify);
616
617 svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
618}
619
620static int vnic_dev_notify_ready(struct vnic_dev *vdev)
621{
622 u32 *words;
623 unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
624 unsigned int i;
625 u32 csum;
626
627 if (!vdev->notify)
628 return 0;
629
630 do {
631 csum = 0;
632 memcpy(&vdev->notify_copy, vdev->notify,
633 sizeof(struct vnic_devcmd_notify));
634 words = (u32 *)&vdev->notify_copy;
635 for (i = 1; i < nwords; i++)
636 csum += words[i];
637 } while (csum != words[0]);
638
639 return 1;
640}
641
642int svnic_dev_init(struct vnic_dev *vdev, int arg)
643{
644 u64 a0 = (u32)arg, a1 = 0;
645 int wait = VNIC_DVCMD_TMO;
646
647 return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
648}
649
650int svnic_dev_link_status(struct vnic_dev *vdev)
651{
652 if (vdev->linkstatus)
653 return *vdev->linkstatus;
654
655 if (!vnic_dev_notify_ready(vdev))
656 return 0;
657
658 return vdev->notify_copy.link_state;
659}
660
661u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev)
662{
663 if (!vnic_dev_notify_ready(vdev))
664 return 0;
665
666 return vdev->notify_copy.link_down_cnt;
667}
668
669void svnic_dev_set_intr_mode(struct vnic_dev *vdev,
670 enum vnic_dev_intr_mode intr_mode)
671{
672 vdev->intr_mode = intr_mode;
673}
674
675enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev)
676{
677 return vdev->intr_mode;
678}
679
680void svnic_dev_unregister(struct vnic_dev *vdev)
681{
682 if (vdev) {
683 if (vdev->notify)
684 pci_free_consistent(vdev->pdev,
685 sizeof(struct vnic_devcmd_notify),
686 vdev->notify,
687 vdev->notify_pa);
688 if (vdev->linkstatus)
689 pci_free_consistent(vdev->pdev,
690 sizeof(u32),
691 vdev->linkstatus,
692 vdev->linkstatus_pa);
693 if (vdev->stats)
694 pci_free_consistent(vdev->pdev,
695 sizeof(struct vnic_stats),
696 vdev->stats, vdev->stats_pa);
697 if (vdev->fw_info)
698 pci_free_consistent(vdev->pdev,
699 sizeof(struct vnic_devcmd_fw_info),
700 vdev->fw_info, vdev->fw_info_pa);
701 if (vdev->devcmd2)
702 vnic_dev_deinit_devcmd2(vdev);
703 kfree(vdev);
704 }
705}
706
707struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev,
708 void *priv,
709 struct pci_dev *pdev,
710 struct vnic_dev_bar *bar,
711 unsigned int num_bars)
712{
713 if (!vdev) {
714 vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
715 if (!vdev)
716 return NULL;
717 }
718
719 vdev->priv = priv;
720 vdev->pdev = pdev;
721
722 if (vnic_dev_discover_res(vdev, bar, num_bars))
723 goto err_out;
724
725 return vdev;
726
727err_out:
728 svnic_dev_unregister(vdev);
729
730 return NULL;
731} /* end of svnic_dev_alloc_discover */
732
733/*
734 * fallback option is left to keep the interface common for other vnics.
735 */
736int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback)
737{
738 int err = -ENODEV;
739 void __iomem *p;
740
741 p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
742 if (p)
743 err = svnic_dev_init_devcmd2(vdev);
744 else
745 pr_err("DEVCMD2 resource not found.\n");
746
747 return err;
748} /* end of svnic_dev_cmd_init */
Linux kernel - Deliverables
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