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5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/string.h>
9#include <linux/delay.h>
10#include <linux/sched.h>
11#include <linux/slab.h>
12
13#include <asm/ldc.h>
14#include <asm/vio.h>
15
16int vio_ldc_send(struct vio_driver_state *vio, void *data, int len)
17{
18 int err, limit = 1000;
19
20 err = -EINVAL;
21 while (limit-- > 0) {
22 err = ldc_write(vio->lp, data, len);
23 if (!err || (err != -EAGAIN))
24 break;
25 udelay(1);
26 }
27
28 return err;
29}
30EXPORT_SYMBOL(vio_ldc_send);
31
32static int send_ctrl(struct vio_driver_state *vio,
33 struct vio_msg_tag *tag, int len)
34{
35 tag->sid = vio_send_sid(vio);
36 return vio_ldc_send(vio, tag, len);
37}
38
39static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env)
40{
41 tag->type = type;
42 tag->stype = stype;
43 tag->stype_env = stype_env;
44}
45
46static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
47{
48 struct vio_ver_info pkt;
49
50 vio->_local_sid = (u32) sched_clock();
51
52 memset(&pkt, 0, sizeof(pkt));
53 init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
54 pkt.major = major;
55 pkt.minor = minor;
56 pkt.dev_class = vio->dev_class;
57
58 viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
59 major, minor, vio->dev_class);
60
61 return send_ctrl(vio, &pkt.tag, sizeof(pkt));
62}
63
64static int start_handshake(struct vio_driver_state *vio)
65{
66 int err;
67
68 viodbg(HS, "START HANDSHAKE\n");
69
70 vio->hs_state = VIO_HS_INVALID;
71
72 err = send_version(vio,
73 vio->ver_table[0].major,
74 vio->ver_table[0].minor);
75 if (err < 0)
76 return err;
77
78 return 0;
79}
80
81static void flush_rx_dring(struct vio_driver_state *vio)
82{
83 struct vio_dring_state *dr;
84 u64 ident;
85
86 BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG));
87
88 dr = &vio->drings[VIO_DRIVER_RX_RING];
89 ident = dr->ident;
90
91 BUG_ON(!vio->desc_buf);
92 kfree(vio->desc_buf);
93 vio->desc_buf = NULL;
94
95 memset(dr, 0, sizeof(*dr));
96 dr->ident = ident;
97}
98
99void vio_link_state_change(struct vio_driver_state *vio, int event)
100{
101 if (event == LDC_EVENT_UP) {
102 vio->hs_state = VIO_HS_INVALID;
103
104 switch (vio->dev_class) {
105 case VDEV_NETWORK:
106 case VDEV_NETWORK_SWITCH:
107 vio->dr_state = (VIO_DR_STATE_TXREQ |
108 VIO_DR_STATE_RXREQ);
109 break;
110
111 case VDEV_DISK:
112 vio->dr_state = VIO_DR_STATE_TXREQ;
113 break;
114 case VDEV_DISK_SERVER:
115 vio->dr_state = VIO_DR_STATE_RXREQ;
116 break;
117 }
118 start_handshake(vio);
119 } else if (event == LDC_EVENT_RESET) {
120 vio->hs_state = VIO_HS_INVALID;
121
122 if (vio->dr_state & VIO_DR_STATE_RXREG)
123 flush_rx_dring(vio);
124
125 vio->dr_state = 0x00;
126 memset(&vio->ver, 0, sizeof(vio->ver));
127
128 ldc_disconnect(vio->lp);
129 }
130}
131EXPORT_SYMBOL(vio_link_state_change);
132
133static int handshake_failure(struct vio_driver_state *vio)
134{
135 struct vio_dring_state *dr;
136
137
138
139
140
141
142 viodbg(HS, "HANDSHAKE FAILURE\n");
143
144 vio->dr_state &= ~(VIO_DR_STATE_TXREG |
145 VIO_DR_STATE_RXREG);
146
147 dr = &vio->drings[VIO_DRIVER_RX_RING];
148 memset(dr, 0, sizeof(*dr));
149
150 kfree(vio->desc_buf);
151 vio->desc_buf = NULL;
152 vio->desc_buf_len = 0;
153
154 vio->hs_state = VIO_HS_INVALID;
155
156 return -ECONNRESET;
157}
158
159static int process_unknown(struct vio_driver_state *vio, void *arg)
160{
161 struct vio_msg_tag *pkt = arg;
162
163 viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
164 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
165
166 printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
167 vio->vdev->channel_id);
168
169 ldc_disconnect(vio->lp);
170
171 return -ECONNRESET;
172}
173
174static int send_dreg(struct vio_driver_state *vio)
175{
176 struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
177 union {
178 struct vio_dring_register pkt;
179 char all[sizeof(struct vio_dring_register) +
180 (sizeof(struct ldc_trans_cookie) *
181 dr->ncookies)];
182 } u;
183 int i;
184
185 memset(&u, 0, sizeof(u));
186 init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
187 u.pkt.dring_ident = 0;
188 u.pkt.num_descr = dr->num_entries;
189 u.pkt.descr_size = dr->entry_size;
190 u.pkt.options = VIO_TX_DRING;
191 u.pkt.num_cookies = dr->ncookies;
192
193 viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
194 "ncookies[%u]\n",
195 u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
196 u.pkt.num_cookies);
197
198 for (i = 0; i < dr->ncookies; i++) {
199 u.pkt.cookies[i] = dr->cookies[i];
200
201 viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
202 i,
203 (unsigned long long) u.pkt.cookies[i].cookie_addr,
204 (unsigned long long) u.pkt.cookies[i].cookie_size);
205 }
206
207 return send_ctrl(vio, &u.pkt.tag, sizeof(u));
208}
209
210static int send_rdx(struct vio_driver_state *vio)
211{
212 struct vio_rdx pkt;
213
214 memset(&pkt, 0, sizeof(pkt));
215
216 init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);
217
218 viodbg(HS, "SEND RDX INFO\n");
219
220 return send_ctrl(vio, &pkt.tag, sizeof(pkt));
221}
222
223static int send_attr(struct vio_driver_state *vio)
224{
225 return vio->ops->send_attr(vio);
226}
227
228static struct vio_version *find_by_major(struct vio_driver_state *vio,
229 u16 major)
230{
231 struct vio_version *ret = NULL;
232 int i;
233
234 for (i = 0; i < vio->ver_table_entries; i++) {
235 struct vio_version *v = &vio->ver_table[i];
236 if (v->major <= major) {
237 ret = v;
238 break;
239 }
240 }
241 return ret;
242}
243
244static int process_ver_info(struct vio_driver_state *vio,
245 struct vio_ver_info *pkt)
246{
247 struct vio_version *vap;
248 int err;
249
250 viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
251 pkt->major, pkt->minor, pkt->dev_class);
252
253 if (vio->hs_state != VIO_HS_INVALID) {
254
255 memset(&vio->ver, 0, sizeof(vio->ver));
256 vio->hs_state = VIO_HS_INVALID;
257 }
258
259 vap = find_by_major(vio, pkt->major);
260
261 vio->_peer_sid = pkt->tag.sid;
262
263 if (!vap) {
264 pkt->tag.stype = VIO_SUBTYPE_NACK;
265 pkt->major = 0;
266 pkt->minor = 0;
267 viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
268 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
269 } else if (vap->major != pkt->major) {
270 pkt->tag.stype = VIO_SUBTYPE_NACK;
271 pkt->major = vap->major;
272 pkt->minor = vap->minor;
273 viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
274 pkt->major, pkt->minor);
275 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
276 } else {
277 struct vio_version ver = {
278 .major = pkt->major,
279 .minor = pkt->minor,
280 };
281 if (ver.minor > vap->minor)
282 ver.minor = vap->minor;
283 pkt->minor = ver.minor;
284 pkt->tag.stype = VIO_SUBTYPE_ACK;
285 viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
286 pkt->major, pkt->minor);
287 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
288 if (err > 0) {
289 vio->ver = ver;
290 vio->hs_state = VIO_HS_GOTVERS;
291 }
292 }
293 if (err < 0)
294 return handshake_failure(vio);
295
296 return 0;
297}
298
299static int process_ver_ack(struct vio_driver_state *vio,
300 struct vio_ver_info *pkt)
301{
302 viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
303 pkt->major, pkt->minor, pkt->dev_class);
304
305 if (vio->hs_state & VIO_HS_GOTVERS) {
306 if (vio->ver.major != pkt->major ||
307 vio->ver.minor != pkt->minor) {
308 pkt->tag.stype = VIO_SUBTYPE_NACK;
309 (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
310 return handshake_failure(vio);
311 }
312 } else {
313 vio->ver.major = pkt->major;
314 vio->ver.minor = pkt->minor;
315 vio->hs_state = VIO_HS_GOTVERS;
316 }
317
318 switch (vio->dev_class) {
319 case VDEV_NETWORK:
320 case VDEV_DISK:
321 if (send_attr(vio) < 0)
322 return handshake_failure(vio);
323 break;
324
325 default:
326 break;
327 }
328
329 return 0;
330}
331
332static int process_ver_nack(struct vio_driver_state *vio,
333 struct vio_ver_info *pkt)
334{
335 struct vio_version *nver;
336
337 viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
338 pkt->major, pkt->minor, pkt->dev_class);
339
340 if (pkt->major == 0 && pkt->minor == 0)
341 return handshake_failure(vio);
342 nver = find_by_major(vio, pkt->major);
343 if (!nver)
344 return handshake_failure(vio);
345
346 if (send_version(vio, nver->major, nver->minor) < 0)
347 return handshake_failure(vio);
348
349 return 0;
350}
351
352static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt)
353{
354 switch (pkt->tag.stype) {
355 case VIO_SUBTYPE_INFO:
356 return process_ver_info(vio, pkt);
357
358 case VIO_SUBTYPE_ACK:
359 return process_ver_ack(vio, pkt);
360
361 case VIO_SUBTYPE_NACK:
362 return process_ver_nack(vio, pkt);
363
364 default:
365 return handshake_failure(vio);
366 };
367}
368
369static int process_attr(struct vio_driver_state *vio, void *pkt)
370{
371 int err;
372
373 if (!(vio->hs_state & VIO_HS_GOTVERS))
374 return handshake_failure(vio);
375
376 err = vio->ops->handle_attr(vio, pkt);
377 if (err < 0) {
378 return handshake_failure(vio);
379 } else {
380 vio->hs_state |= VIO_HS_GOT_ATTR;
381
382 if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
383 !(vio->hs_state & VIO_HS_SENT_DREG)) {
384 if (send_dreg(vio) < 0)
385 return handshake_failure(vio);
386
387 vio->hs_state |= VIO_HS_SENT_DREG;
388 }
389 }
390 return 0;
391}
392
393static int all_drings_registered(struct vio_driver_state *vio)
394{
395 int need_rx, need_tx;
396
397 need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ);
398 need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);
399
400 if (need_rx &&
401 !(vio->dr_state & VIO_DR_STATE_RXREG))
402 return 0;
403
404 if (need_tx &&
405 !(vio->dr_state & VIO_DR_STATE_TXREG))
406 return 0;
407
408 return 1;
409}
410
411static int process_dreg_info(struct vio_driver_state *vio,
412 struct vio_dring_register *pkt)
413{
414 struct vio_dring_state *dr;
415 int i, len;
416
417 viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
418 "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
419 (unsigned long long) pkt->dring_ident,
420 pkt->num_descr, pkt->descr_size, pkt->options,
421 pkt->num_cookies);
422
423 if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
424 goto send_nack;
425
426 if (vio->dr_state & VIO_DR_STATE_RXREG)
427 goto send_nack;
428
429 BUG_ON(vio->desc_buf);
430
431 vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
432 if (!vio->desc_buf)
433 goto send_nack;
434
435 vio->desc_buf_len = pkt->descr_size;
436
437 dr = &vio->drings[VIO_DRIVER_RX_RING];
438
439 dr->num_entries = pkt->num_descr;
440 dr->entry_size = pkt->descr_size;
441 dr->ncookies = pkt->num_cookies;
442 for (i = 0; i < dr->ncookies; i++) {
443 dr->cookies[i] = pkt->cookies[i];
444
445 viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
446 i,
447 (unsigned long long)
448 pkt->cookies[i].cookie_addr,
449 (unsigned long long)
450 pkt->cookies[i].cookie_size);
451 }
452
453 pkt->tag.stype = VIO_SUBTYPE_ACK;
454 pkt->dring_ident = ++dr->ident;
455
456 viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n",
457 (unsigned long long) pkt->dring_ident);
458
459 len = (sizeof(*pkt) +
460 (dr->ncookies * sizeof(struct ldc_trans_cookie)));
461 if (send_ctrl(vio, &pkt->tag, len) < 0)
462 goto send_nack;
463
464 vio->dr_state |= VIO_DR_STATE_RXREG;
465
466 return 0;
467
468send_nack:
469 pkt->tag.stype = VIO_SUBTYPE_NACK;
470 viodbg(HS, "SEND DRING_REG NACK\n");
471 (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
472
473 return handshake_failure(vio);
474}
475
476static int process_dreg_ack(struct vio_driver_state *vio,
477 struct vio_dring_register *pkt)
478{
479 struct vio_dring_state *dr;
480
481 viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
482 "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
483 (unsigned long long) pkt->dring_ident,
484 pkt->num_descr, pkt->descr_size, pkt->options,
485 pkt->num_cookies);
486
487 dr = &vio->drings[VIO_DRIVER_TX_RING];
488
489 if (!(vio->dr_state & VIO_DR_STATE_TXREQ))
490 return handshake_failure(vio);
491
492 dr->ident = pkt->dring_ident;
493 vio->dr_state |= VIO_DR_STATE_TXREG;
494
495 if (all_drings_registered(vio)) {
496 if (send_rdx(vio) < 0)
497 return handshake_failure(vio);
498 vio->hs_state = VIO_HS_SENT_RDX;
499 }
500 return 0;
501}
502
503static int process_dreg_nack(struct vio_driver_state *vio,
504 struct vio_dring_register *pkt)
505{
506 viodbg(HS, "GOT DRING_REG NACK ident[%llx] "
507 "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
508 (unsigned long long) pkt->dring_ident,
509 pkt->num_descr, pkt->descr_size, pkt->options,
510 pkt->num_cookies);
511
512 return handshake_failure(vio);
513}
514
515static int process_dreg(struct vio_driver_state *vio,
516 struct vio_dring_register *pkt)
517{
518 if (!(vio->hs_state & VIO_HS_GOTVERS))
519 return handshake_failure(vio);
520
521 switch (pkt->tag.stype) {
522 case VIO_SUBTYPE_INFO:
523 return process_dreg_info(vio, pkt);
524
525 case VIO_SUBTYPE_ACK:
526 return process_dreg_ack(vio, pkt);
527
528 case VIO_SUBTYPE_NACK:
529 return process_dreg_nack(vio, pkt);
530
531 default:
532 return handshake_failure(vio);
533 }
534}
535
536static int process_dunreg(struct vio_driver_state *vio,
537 struct vio_dring_unregister *pkt)
538{
539 struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING];
540
541 viodbg(HS, "GOT DRING_UNREG\n");
542
543 if (pkt->dring_ident != dr->ident)
544 return 0;
545
546 vio->dr_state &= ~VIO_DR_STATE_RXREG;
547
548 memset(dr, 0, sizeof(*dr));
549
550 kfree(vio->desc_buf);
551 vio->desc_buf = NULL;
552 vio->desc_buf_len = 0;
553
554 return 0;
555}
556
557static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt)
558{
559 viodbg(HS, "GOT RDX INFO\n");
560
561 pkt->tag.stype = VIO_SUBTYPE_ACK;
562 viodbg(HS, "SEND RDX ACK\n");
563 if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0)
564 return handshake_failure(vio);
565
566 vio->hs_state |= VIO_HS_SENT_RDX_ACK;
567 return 0;
568}
569
570static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt)
571{
572 viodbg(HS, "GOT RDX ACK\n");
573
574 if (!(vio->hs_state & VIO_HS_SENT_RDX))
575 return handshake_failure(vio);
576
577 vio->hs_state |= VIO_HS_GOT_RDX_ACK;
578 return 0;
579}
580
581static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt)
582{
583 viodbg(HS, "GOT RDX NACK\n");
584
585 return handshake_failure(vio);
586}
587
588static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt)
589{
590 if (!all_drings_registered(vio))
591 handshake_failure(vio);
592
593 switch (pkt->tag.stype) {
594 case VIO_SUBTYPE_INFO:
595 return process_rdx_info(vio, pkt);
596
597 case VIO_SUBTYPE_ACK:
598 return process_rdx_ack(vio, pkt);
599
600 case VIO_SUBTYPE_NACK:
601 return process_rdx_nack(vio, pkt);
602
603 default:
604 return handshake_failure(vio);
605 }
606}
607
608int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt)
609{
610 struct vio_msg_tag *tag = pkt;
611 u8 prev_state = vio->hs_state;
612 int err;
613
614 switch (tag->stype_env) {
615 case VIO_VER_INFO:
616 err = process_ver(vio, pkt);
617 break;
618
619 case VIO_ATTR_INFO:
620 err = process_attr(vio, pkt);
621 break;
622
623 case VIO_DRING_REG:
624 err = process_dreg(vio, pkt);
625 break;
626
627 case VIO_DRING_UNREG:
628 err = process_dunreg(vio, pkt);
629 break;
630
631 case VIO_RDX:
632 err = process_rdx(vio, pkt);
633 break;
634
635 default:
636 err = process_unknown(vio, pkt);
637 break;
638 }
639 if (!err &&
640 vio->hs_state != prev_state &&
641 (vio->hs_state & VIO_HS_COMPLETE))
642 vio->ops->handshake_complete(vio);
643
644 return err;
645}
646EXPORT_SYMBOL(vio_control_pkt_engine);
647
648void vio_conn_reset(struct vio_driver_state *vio)
649{
650}
651EXPORT_SYMBOL(vio_conn_reset);
652
653
654
655
656
657
658int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp)
659{
660 u32 sid;
661
662
663
664
665 if (tp->type == VIO_TYPE_CTRL &&
666 tp->stype == VIO_SUBTYPE_INFO &&
667 tp->stype_env == VIO_VER_INFO)
668 return 0;
669
670
671 switch (vio->dev_class) {
672 case VDEV_NETWORK:
673 case VDEV_NETWORK_SWITCH:
674 case VDEV_DISK_SERVER:
675 default:
676 sid = vio->_peer_sid;
677 break;
678
679 case VDEV_DISK:
680 sid = vio->_local_sid;
681 break;
682 }
683
684 if (sid == tp->sid)
685 return 0;
686 viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n",
687 tp->sid, vio->_peer_sid, vio->_local_sid);
688 return -EINVAL;
689}
690EXPORT_SYMBOL(vio_validate_sid);
691
692u32 vio_send_sid(struct vio_driver_state *vio)
693{
694 switch (vio->dev_class) {
695 case VDEV_NETWORK:
696 case VDEV_NETWORK_SWITCH:
697 case VDEV_DISK:
698 default:
699 return vio->_local_sid;
700
701 case VDEV_DISK_SERVER:
702 return vio->_peer_sid;
703 }
704}
705EXPORT_SYMBOL(vio_send_sid);
706
707int vio_ldc_alloc(struct vio_driver_state *vio,
708 struct ldc_channel_config *base_cfg,
709 void *event_arg)
710{
711 struct ldc_channel_config cfg = *base_cfg;
712 struct ldc_channel *lp;
713
714 cfg.tx_irq = vio->vdev->tx_irq;
715 cfg.rx_irq = vio->vdev->rx_irq;
716
717 lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg);
718 if (IS_ERR(lp))
719 return PTR_ERR(lp);
720
721 vio->lp = lp;
722
723 return 0;
724}
725EXPORT_SYMBOL(vio_ldc_alloc);
726
727void vio_ldc_free(struct vio_driver_state *vio)
728{
729 ldc_free(vio->lp);
730 vio->lp = NULL;
731
732 kfree(vio->desc_buf);
733 vio->desc_buf = NULL;
734 vio->desc_buf_len = 0;
735}
736EXPORT_SYMBOL(vio_ldc_free);
737
738void vio_port_up(struct vio_driver_state *vio)
739{
740 unsigned long flags;
741 int err, state;
742
743 spin_lock_irqsave(&vio->lock, flags);
744
745 state = ldc_state(vio->lp);
746
747 err = 0;
748 if (state == LDC_STATE_INIT) {
749 err = ldc_bind(vio->lp, vio->name);
750 if (err)
751 printk(KERN_WARNING "%s: Port %lu bind failed, "
752 "err=%d\n",
753 vio->name, vio->vdev->channel_id, err);
754 }
755
756 if (!err) {
757 err = ldc_connect(vio->lp);
758 if (err)
759 printk(KERN_WARNING "%s: Port %lu connect failed, "
760 "err=%d\n",
761 vio->name, vio->vdev->channel_id, err);
762 }
763 if (err) {
764 unsigned long expires = jiffies + HZ;
765
766 expires = round_jiffies(expires);
767 mod_timer(&vio->timer, expires);
768 }
769
770 spin_unlock_irqrestore(&vio->lock, flags);
771}
772EXPORT_SYMBOL(vio_port_up);
773
774static void vio_port_timer(unsigned long _arg)
775{
776 struct vio_driver_state *vio = (struct vio_driver_state *) _arg;
777
778 vio_port_up(vio);
779}
780
781int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
782 u8 dev_class, struct vio_version *ver_table,
783 int ver_table_size, struct vio_driver_ops *ops,
784 char *name)
785{
786 switch (dev_class) {
787 case VDEV_NETWORK:
788 case VDEV_NETWORK_SWITCH:
789 case VDEV_DISK:
790 case VDEV_DISK_SERVER:
791 break;
792
793 default:
794 return -EINVAL;
795 }
796
797 if (!ops->send_attr ||
798 !ops->handle_attr ||
799 !ops->handshake_complete)
800 return -EINVAL;
801
802 if (!ver_table || ver_table_size < 0)
803 return -EINVAL;
804
805 if (!name)
806 return -EINVAL;
807
808 spin_lock_init(&vio->lock);
809
810 vio->name = name;
811
812 vio->dev_class = dev_class;
813 vio->vdev = vdev;
814
815 vio->ver_table = ver_table;
816 vio->ver_table_entries = ver_table_size;
817
818 vio->ops = ops;
819
820 setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio);
821
822 return 0;
823}
824EXPORT_SYMBOL(vio_driver_init);
825
