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Merge tag 'mmc-merge-for-3.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / drivers / block / sunvdc.c
CommitLineData
667ef3c3
DM		 1/* sunvdc.c: Sun LDOM Virtual Disk Client.
2 *
3d452e55 3 * Copyright (C) 2007, 2008 David S. Miller <[email protected]>
667ef3c3
DM		 4 */
5
6#include <linux/module.h>
7#include <linux/kernel.h>
8#include <linux/types.h>
9#include <linux/blkdev.h>
10#include <linux/hdreg.h>
11#include <linux/genhd.h>
12#include <linux/slab.h>
13#include <linux/spinlock.h>
14#include <linux/completion.h>
15#include <linux/delay.h>
16#include <linux/init.h>
17#include <linux/list.h>
d91c5e88 18#include <linux/scatterlist.h>
667ef3c3
DM		 19
20#include <asm/vio.h>
21#include <asm/ldc.h>
22
23#define DRV_MODULE_NAME "sunvdc"
24#define PFX DRV_MODULE_NAME ": "
25#define DRV_MODULE_VERSION "1.0"
26#define DRV_MODULE_RELDATE "June 25, 2007"
27
28static char version[] __devinitdata =
29 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
30MODULE_AUTHOR("David S. Miller ([email protected])");
31MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
32MODULE_LICENSE("GPL");
33MODULE_VERSION(DRV_MODULE_VERSION);
34
35#define VDC_TX_RING_SIZE 256
36
37#define WAITING_FOR_LINK_UP 0x01
38#define WAITING_FOR_TX_SPACE 0x02
39#define WAITING_FOR_GEN_CMD 0x04
40#define WAITING_FOR_ANY -1
41
42struct vdc_req_entry {
43 struct request *req;
44};
45
46struct vdc_port {
47 struct vio_driver_state vio;
48
667ef3c3
DM		 49 struct gendisk *disk;
50
51 struct vdc_completion *cmp;
52
53 u64 req_id;
54 u64 seq;
55 struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE];
56
57 unsigned long ring_cookies;
58
59 u64 max_xfer_size;
60 u32 vdisk_block_size;
61
62 /* The server fills these in for us in the disk attribute
63 * ACK packet.
64 */
65 u64 operations;
66 u32 vdisk_size;
67 u8 vdisk_type;
667ef3c3
DM		 68
69 char disk_name[32];
70
71 struct vio_disk_geom geom;
72 struct vio_disk_vtoc label;
667ef3c3
DM		 73};
74
75static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
76{
77 return container_of(vio, struct vdc_port, vio);
78}
79
667ef3c3
DM		 80/* Ordered from largest major to lowest */
81static struct vio_version vdc_versions[] = {
82 { .major = 1, .minor = 0 },
83};
84
85#define VDCBLK_NAME "vdisk"
86static int vdc_major;
87#define PARTITION_SHIFT 3
88
89static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
90{
91 return vio_dring_avail(dr, VDC_TX_RING_SIZE);
92}
93
94static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
95{
96 struct gendisk *disk = bdev->bd_disk;
97 struct vdc_port *port = disk->private_data;
98
99 geo->heads = (u8) port->geom.num_hd;
100 geo->sectors = (u8) port->geom.num_sec;
101 geo->cylinders = port->geom.num_cyl;
102
103 return 0;
104}
105
83d5cde4 106static const struct block_device_operations vdc_fops = {
667ef3c3
DM		 107 .owner = THIS_MODULE,
108 .getgeo = vdc_getgeo,
109};
110
111static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
112{
113 if (vio->cmp &&
114 (waiting_for == -1 ||
115 vio->cmp->waiting_for == waiting_for)) {
116 vio->cmp->err = err;
117 complete(&vio->cmp->com);
118 vio->cmp = NULL;
119 }
120}
121
122static void vdc_handshake_complete(struct vio_driver_state *vio)
123{
124 vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
125}
126
127static int vdc_handle_unknown(struct vdc_port *port, void *arg)
128{
129 struct vio_msg_tag *pkt = arg;
130
131 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
132 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
133 printk(KERN_ERR PFX "Resetting connection.\n");
134
135 ldc_disconnect(port->vio.lp);
136
137 return -ECONNRESET;
138}
139
140static int vdc_send_attr(struct vio_driver_state *vio)
141{
142 struct vdc_port *port = to_vdc_port(vio);
143 struct vio_disk_attr_info pkt;
144
145 memset(&pkt, 0, sizeof(pkt));
146
147 pkt.tag.type = VIO_TYPE_CTRL;
148 pkt.tag.stype = VIO_SUBTYPE_INFO;
149 pkt.tag.stype_env = VIO_ATTR_INFO;
150 pkt.tag.sid = vio_send_sid(vio);
151
152 pkt.xfer_mode = VIO_DRING_MODE;
153 pkt.vdisk_block_size = port->vdisk_block_size;
154 pkt.max_xfer_size = port->max_xfer_size;
155
3f4528d6 156 viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
667ef3c3
DM		 157 pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
158
159 return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
160}
161
162static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
163{
164 struct vdc_port *port = to_vdc_port(vio);
165 struct vio_disk_attr_info *pkt = arg;
166
3f4528d6
SR		 167 viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] "
168 "xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
667ef3c3
DM		 169 pkt->tag.stype, pkt->operations,
170 pkt->vdisk_size, pkt->vdisk_type,
171 pkt->xfer_mode, pkt->vdisk_block_size,
172 pkt->max_xfer_size);
173
174 if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
175 switch (pkt->vdisk_type) {
176 case VD_DISK_TYPE_DISK:
177 case VD_DISK_TYPE_SLICE:
178 break;
179
180 default:
181 printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
182 vio->name, pkt->vdisk_type);
183 return -ECONNRESET;
184 }
185
186 if (pkt->vdisk_block_size > port->vdisk_block_size) {
187 printk(KERN_ERR PFX "%s: BLOCK size increased "
188 "%u --> %u\n",
189 vio->name,
190 port->vdisk_block_size, pkt->vdisk_block_size);
191 return -ECONNRESET;
192 }
193
194 port->operations = pkt->operations;
195 port->vdisk_size = pkt->vdisk_size;
196 port->vdisk_type = pkt->vdisk_type;
197 if (pkt->max_xfer_size < port->max_xfer_size)
198 port->max_xfer_size = pkt->max_xfer_size;
199 port->vdisk_block_size = pkt->vdisk_block_size;
200 return 0;
201 } else {
202 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
203
204 return -ECONNRESET;
205 }
206}
207
208static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
209{
210 int err = desc->status;
211
212 vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
213}
214
667ef3c3
DM		 215static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
216 unsigned int index)
217{
218 struct vio_disk_desc *desc = vio_dring_entry(dr, index);
219 struct vdc_req_entry *rqe = &port->rq_arr[index];
220 struct request *req;
221
222 if (unlikely(desc->hdr.state != VIO_DESC_DONE))
223 return;
224
225 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
226 desc->hdr.state = VIO_DESC_FREE;
227 dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1);
228
229 req = rqe->req;
230 if (req == NULL) {
231 vdc_end_special(port, desc);
232 return;
233 }
234
235 rqe->req = NULL;
236
04420850 237 __blk_end_request(req, (desc->status ? -EIO : 0), desc->size);
667ef3c3
DM		 238
239 if (blk_queue_stopped(port->disk->queue))
240 blk_start_queue(port->disk->queue);
241}
242
243static int vdc_ack(struct vdc_port *port, void *msgbuf)
244{
245 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
246 struct vio_dring_data *pkt = msgbuf;
247
248 if (unlikely(pkt->dring_ident != dr->ident ||
249 pkt->start_idx != pkt->end_idx ||
250 pkt->start_idx >= VDC_TX_RING_SIZE))
251 return 0;
252
253 vdc_end_one(port, dr, pkt->start_idx);
254
255 return 0;
256}
257
258static int vdc_nack(struct vdc_port *port, void *msgbuf)
259{
260 /* XXX Implement me XXX */
261 return 0;
262}
263
264static void vdc_event(void *arg, int event)
265{
266 struct vdc_port *port = arg;
267 struct vio_driver_state *vio = &port->vio;
268 unsigned long flags;
269 int err;
270
271 spin_lock_irqsave(&vio->lock, flags);
272
273 if (unlikely(event == LDC_EVENT_RESET ||
274 event == LDC_EVENT_UP)) {
275 vio_link_state_change(vio, event);
276 spin_unlock_irqrestore(&vio->lock, flags);
277 return;
278 }
279
280 if (unlikely(event != LDC_EVENT_DATA_READY)) {
281 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
282 spin_unlock_irqrestore(&vio->lock, flags);
283 return;
284 }
285
286 err = 0;
287 while (1) {
288 union {
289 struct vio_msg_tag tag;
290 u64 raw[8];
291 } msgbuf;
292
293 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
294 if (unlikely(err < 0)) {
295 if (err == -ECONNRESET)
296 vio_conn_reset(vio);
297 break;
298 }
299 if (err == 0)
300 break;
301 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
302 msgbuf.tag.type,
303 msgbuf.tag.stype,
304 msgbuf.tag.stype_env,
305 msgbuf.tag.sid);
306 err = vio_validate_sid(vio, &msgbuf.tag);
307 if (err < 0)
308 break;
309
310 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
311 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
312 err = vdc_ack(port, &msgbuf);
313 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
314 err = vdc_nack(port, &msgbuf);
315 else
316 err = vdc_handle_unknown(port, &msgbuf);
317 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
318 err = vio_control_pkt_engine(vio, &msgbuf);
319 } else {
320 err = vdc_handle_unknown(port, &msgbuf);
321 }
322 if (err < 0)
323 break;
324 }
325 if (err < 0)
326 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
327 spin_unlock_irqrestore(&vio->lock, flags);
328}
329
330static int __vdc_tx_trigger(struct vdc_port *port)
331{
332 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
333 struct vio_dring_data hdr = {
334 .tag = {
335 .type = VIO_TYPE_DATA,
336 .stype = VIO_SUBTYPE_INFO,
337 .stype_env = VIO_DRING_DATA,
338 .sid = vio_send_sid(&port->vio),
339 },
340 .dring_ident = dr->ident,
341 .start_idx = dr->prod,
342 .end_idx = dr->prod,
343 };
344 int err, delay;
345
346 hdr.seq = dr->snd_nxt;
347 delay = 1;
348 do {
349 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
350 if (err > 0) {
351 dr->snd_nxt++;
352 break;
353 }
354 udelay(delay);
355 if ((delay <<= 1) > 128)
356 delay = 128;
357 } while (err == -EAGAIN);
358
359 return err;
360}
361
362static int __send_request(struct request *req)
363{
364 struct vdc_port *port = req->rq_disk->private_data;
365 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
366 struct scatterlist sg[port->ring_cookies];
367 struct vdc_req_entry *rqe;
368 struct vio_disk_desc *desc;
369 unsigned int map_perm;
370 int nsg, err, i;
371 u64 len;
372 u8 op;
373
374 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
375
376 if (rq_data_dir(req) == READ) {
377 map_perm |= LDC_MAP_W;
378 op = VD_OP_BREAD;
379 } else {
380 map_perm |= LDC_MAP_R;
381 op = VD_OP_BWRITE;
382 }
383
45711f1a 384 sg_init_table(sg, port->ring_cookies);
667ef3c3
DM		 385 nsg = blk_rq_map_sg(req->q, req, sg);
386
387 len = 0;
388 for (i = 0; i < nsg; i++)
389 len += sg[i].length;
390
391 if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
392 blk_stop_queue(port->disk->queue);
393 err = -ENOMEM;
394 goto out;
395 }
396
397 desc = vio_dring_cur(dr);
398
399 err = ldc_map_sg(port->vio.lp, sg, nsg,
400 desc->cookies, port->ring_cookies,
401 map_perm);
402 if (err < 0) {
403 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
404 return err;
405 }
406
407 rqe = &port->rq_arr[dr->prod];
408 rqe->req = req;
409
410 desc->hdr.ack = VIO_ACK_ENABLE;
411 desc->req_id = port->req_id;
412 desc->operation = op;
413 if (port->vdisk_type == VD_DISK_TYPE_DISK) {
1bd4b280 414 desc->slice = 0xff;
667ef3c3
DM		 415 } else {
416 desc->slice = 0;
417 }
418 desc->status = ~0;
83096ebf 419 desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
667ef3c3
DM		 420 desc->size = len;
421 desc->ncookies = err;
422
423 /* This has to be a non-SMP write barrier because we are writing
424 * to memory which is shared with the peer LDOM.
425 */
426 wmb();
427 desc->hdr.state = VIO_DESC_READY;
428
429 err = __vdc_tx_trigger(port);
430 if (err < 0) {
431 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
432 } else {
433 port->req_id++;
434 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
435 }
436out:
437
438 return err;
439}
440
165125e1 441static void do_vdc_request(struct request_queue *q)
667ef3c3
DM		 442{
443 while (1) {
9934c8c0 444 struct request *req = blk_fetch_request(q);
667ef3c3
DM		 445
446 if (!req)
447 break;
448
667ef3c3 449 if (__send_request(req) < 0)
04420850 450 __blk_end_request_all(req, -EIO);
667ef3c3
DM		 451 }
452}
453
454static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
455{
456 struct vio_dring_state *dr;
457 struct vio_completion comp;
458 struct vio_disk_desc *desc;
459 unsigned int map_perm;
460 unsigned long flags;
461 int op_len, err;
462 void *req_buf;
463
464 if (!(((u64)1 << ((u64)op - 1)) & port->operations))
465 return -EOPNOTSUPP;
466
467 switch (op) {
468 case VD_OP_BREAD:
469 case VD_OP_BWRITE:
470 default:
471 return -EINVAL;
472
473 case VD_OP_FLUSH:
474 op_len = 0;
475 map_perm = 0;
476 break;
477
478 case VD_OP_GET_WCE:
479 op_len = sizeof(u32);
480 map_perm = LDC_MAP_W;
481 break;
482
483 case VD_OP_SET_WCE:
484 op_len = sizeof(u32);
485 map_perm = LDC_MAP_R;
486 break;
487
488 case VD_OP_GET_VTOC:
489 op_len = sizeof(struct vio_disk_vtoc);
490 map_perm = LDC_MAP_W;
491 break;
492
493 case VD_OP_SET_VTOC:
494 op_len = sizeof(struct vio_disk_vtoc);
495 map_perm = LDC_MAP_R;
496 break;
497
498 case VD_OP_GET_DISKGEOM:
499 op_len = sizeof(struct vio_disk_geom);
500 map_perm = LDC_MAP_W;
501 break;
502
503 case VD_OP_SET_DISKGEOM:
504 op_len = sizeof(struct vio_disk_geom);
505 map_perm = LDC_MAP_R;
506 break;
507
508 case VD_OP_SCSICMD:
509 op_len = 16;
510 map_perm = LDC_MAP_RW;
511 break;
512
513 case VD_OP_GET_DEVID:
514 op_len = sizeof(struct vio_disk_devid);
515 map_perm = LDC_MAP_W;
516 break;
517
518 case VD_OP_GET_EFI:
519 case VD_OP_SET_EFI:
520 return -EOPNOTSUPP;
521 break;
522 };
523
524 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
525
526 op_len = (op_len + 7) & ~7;
527 req_buf = kzalloc(op_len, GFP_KERNEL);
528 if (!req_buf)
529 return -ENOMEM;
530
531 if (len > op_len)
532 len = op_len;
533
534 if (map_perm & LDC_MAP_R)
535 memcpy(req_buf, buf, len);
536
537 spin_lock_irqsave(&port->vio.lock, flags);
538
539 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
540
541 /* XXX If we want to use this code generically we have to
542 * XXX handle TX ring exhaustion etc.
543 */
544 desc = vio_dring_cur(dr);
545
546 err = ldc_map_single(port->vio.lp, req_buf, op_len,
547 desc->cookies, port->ring_cookies,
548 map_perm);
549 if (err < 0) {
550 spin_unlock_irqrestore(&port->vio.lock, flags);
551 kfree(req_buf);
552 return err;
553 }
554
555 init_completion(&comp.com);
556 comp.waiting_for = WAITING_FOR_GEN_CMD;
557 port->vio.cmp = &comp;
558
559 desc->hdr.ack = VIO_ACK_ENABLE;
560 desc->req_id = port->req_id;
561 desc->operation = op;
562 desc->slice = 0;
563 desc->status = ~0;
564 desc->offset = 0;
565 desc->size = op_len;
566 desc->ncookies = err;
567
568 /* This has to be a non-SMP write barrier because we are writing
569 * to memory which is shared with the peer LDOM.
570 */
571 wmb();
572 desc->hdr.state = VIO_DESC_READY;
573
574 err = __vdc_tx_trigger(port);
575 if (err >= 0) {
576 port->req_id++;
577 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
578 spin_unlock_irqrestore(&port->vio.lock, flags);
579
580 wait_for_completion(&comp.com);
581 err = comp.err;
582 } else {
583 port->vio.cmp = NULL;
584 spin_unlock_irqrestore(&port->vio.lock, flags);
585 }
586
587 if (map_perm & LDC_MAP_W)
588 memcpy(buf, req_buf, len);
589
590 kfree(req_buf);
591
592 return err;
593}
594
595static int __devinit vdc_alloc_tx_ring(struct vdc_port *port)
596{
597 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
598 unsigned long len, entry_size;
599 int ncookies;
600 void *dring;
601
602 entry_size = sizeof(struct vio_disk_desc) +
603 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
604 len = (VDC_TX_RING_SIZE * entry_size);
605
606 ncookies = VIO_MAX_RING_COOKIES;
607 dring = ldc_alloc_exp_dring(port->vio.lp, len,
608 dr->cookies, &ncookies,
609 (LDC_MAP_SHADOW |
610 LDC_MAP_DIRECT |
611 LDC_MAP_RW));
612 if (IS_ERR(dring))
613 return PTR_ERR(dring);
614
615 dr->base = dring;
616 dr->entry_size = entry_size;
617 dr->num_entries = VDC_TX_RING_SIZE;
618 dr->prod = dr->cons = 0;
619 dr->pending = VDC_TX_RING_SIZE;
620 dr->ncookies = ncookies;
621
622 return 0;
623}
624
625static void vdc_free_tx_ring(struct vdc_port *port)
626{
627 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
628
629 if (dr->base) {
630 ldc_free_exp_dring(port->vio.lp, dr->base,
631 (dr->entry_size * dr->num_entries),
632 dr->cookies, dr->ncookies);
633 dr->base = NULL;
634 dr->entry_size = 0;
635 dr->num_entries = 0;
636 dr->pending = 0;
637 dr->ncookies = 0;
638 }
639}
640
641static int probe_disk(struct vdc_port *port)
642{
643 struct vio_completion comp;
644 struct request_queue *q;
645 struct gendisk *g;
646 int err;
647
648 init_completion(&comp.com);
649 comp.err = 0;
650 comp.waiting_for = WAITING_FOR_LINK_UP;
651 port->vio.cmp = &comp;
652
653 vio_port_up(&port->vio);
654
655 wait_for_completion(&comp.com);
656 if (comp.err)
657 return comp.err;
658
659 err = generic_request(port, VD_OP_GET_VTOC,
660 &port->label, sizeof(port->label));
661 if (err < 0) {
662 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err);
663 return err;
664 }
665
666 err = generic_request(port, VD_OP_GET_DISKGEOM,
667 &port->geom, sizeof(port->geom));
668 if (err < 0) {
669 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
670 "error %d\n", err);
671 return err;
672 }
673
674 port->vdisk_size = ((u64)port->geom.num_cyl *
675 (u64)port->geom.num_hd *
676 (u64)port->geom.num_sec);
677
678 q = blk_init_queue(do_vdc_request, &port->vio.lock);
679 if (!q) {
680 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
681 port->vio.name);
682 return -ENOMEM;
683 }
684 g = alloc_disk(1 << PARTITION_SHIFT);
685 if (!g) {
686 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
687 port->vio.name);
688 blk_cleanup_queue(q);
689 return -ENOMEM;
690 }
691
692 port->disk = g;
693
8a78362c 694 blk_queue_max_segments(q, port->ring_cookies);
086fa5ff 695 blk_queue_max_hw_sectors(q, port->max_xfer_size);
667ef3c3 696 g->major = vdc_major;
91ba3c21 697 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
667ef3c3
DM		 698 strcpy(g->disk_name, port->disk_name);
699
700 g->fops = &vdc_fops;
701 g->queue = q;
702 g->private_data = port;
703 g->driverfs_dev = &port->vio.vdev->dev;
704
705 set_capacity(g, port->vdisk_size);
706
707 printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n",
708 g->disk_name,
709 port->vdisk_size, (port->vdisk_size >> (20 - 9)));
710
711 add_disk(g);
712
713 return 0;
714}
715
716static struct ldc_channel_config vdc_ldc_cfg = {
717 .event = vdc_event,
718 .mtu = 64,
719 .mode = LDC_MODE_UNRELIABLE,
720};
721
722static struct vio_driver_ops vdc_vio_ops = {
723 .send_attr = vdc_send_attr,
724 .handle_attr = vdc_handle_attr,
725 .handshake_complete = vdc_handshake_complete,
726};
727
e30f98fc 728static void __devinit print_version(void)
80dc35df
DM		 729{
730 static int version_printed;
731
732 if (version_printed++ == 0)
733 printk(KERN_INFO "%s", version);
734}
735
667ef3c3
DM		 736static int __devinit vdc_port_probe(struct vio_dev *vdev,
737 const struct vio_device_id *id)
738{
43fdf274 739 struct mdesc_handle *hp;
667ef3c3 740 struct vdc_port *port;
667ef3c3
DM		 741 int err;
742
80dc35df 743 print_version();
667ef3c3 744
43fdf274 745 hp = mdesc_grab();
667ef3c3 746
43fdf274 747 err = -ENODEV;
91ba3c21 748 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
3f4528d6 749 printk(KERN_ERR PFX "Port id [%llu] too large.\n",
91ba3c21 750 vdev->dev_no);
43fdf274 751 goto err_out_release_mdesc;
667ef3c3
DM		 752 }
753
754 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 755 err = -ENOMEM;
667ef3c3
DM		 756 if (!port) {
757 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
43fdf274 758 goto err_out_release_mdesc;
667ef3c3
DM		 759 }
760
91ba3c21 761 if (vdev->dev_no >= 26)
667ef3c3
DM		 762 snprintf(port->disk_name, sizeof(port->disk_name),
763 VDCBLK_NAME "%c%c",
91ba3c21
DM		 764 'a' + ((int)vdev->dev_no / 26) - 1,
765 'a' + ((int)vdev->dev_no % 26));
667ef3c3
DM		 766 else
767 snprintf(port->disk_name, sizeof(port->disk_name),
91ba3c21 768 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
667ef3c3 769
43fdf274 770 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
667ef3c3
DM		 771 vdc_versions, ARRAY_SIZE(vdc_versions),
772 &vdc_vio_ops, port->disk_name);
773 if (err)
774 goto err_out_free_port;
775
776 port->vdisk_block_size = 512;
777 port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
778 port->ring_cookies = ((port->max_xfer_size *
779 port->vdisk_block_size) / PAGE_SIZE) + 2;
780
781 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
782 if (err)
783 goto err_out_free_port;
784
785 err = vdc_alloc_tx_ring(port);
786 if (err)
787 goto err_out_free_ldc;
788
789 err = probe_disk(port);
790 if (err)
791 goto err_out_free_tx_ring;
792
667ef3c3
DM		 793 dev_set_drvdata(&vdev->dev, port);
794
43fdf274
DM		 795 mdesc_release(hp);
796
667ef3c3
DM		 797 return 0;
798
799err_out_free_tx_ring:
800 vdc_free_tx_ring(port);
801
802err_out_free_ldc:
803 vio_ldc_free(&port->vio);
804
805err_out_free_port:
806 kfree(port);
807
43fdf274
DM		 808err_out_release_mdesc:
809 mdesc_release(hp);
667ef3c3
DM		 810 return err;
811}
812
813static int vdc_port_remove(struct vio_dev *vdev)
814{
815 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
816
817 if (port) {
818 del_timer_sync(&port->vio.timer);
819
820 vdc_free_tx_ring(port);
821 vio_ldc_free(&port->vio);
822
823 dev_set_drvdata(&vdev->dev, NULL);
824
825 kfree(port);
826 }
827 return 0;
828}
829
3d452e55 830static const struct vio_device_id vdc_port_match[] = {
667ef3c3
DM		 831 {
832 .type = "vdc-port",
833 },
834 {},
835};
da68e081 836MODULE_DEVICE_TABLE(vio, vdc_port_match);
667ef3c3
DM		 837
838static struct vio_driver vdc_port_driver = {
839 .id_table = vdc_port_match,
840 .probe = vdc_port_probe,
841 .remove = vdc_port_remove,
cb52d897 842 .name = "vdc_port",
667ef3c3
DM		 843};
844
667ef3c3
DM		 845static int __init vdc_init(void)
846{
847 int err;
848
849 err = register_blkdev(0, VDCBLK_NAME);
850 if (err < 0)
851 goto out_err;
852
853 vdc_major = err;
667ef3c3
DM		 854
855 err = vio_register_driver(&vdc_port_driver);
856 if (err)
80dc35df 857 goto out_unregister_blkdev;
667ef3c3
DM		 858
859 return 0;
860
667ef3c3
DM		 861out_unregister_blkdev:
862 unregister_blkdev(vdc_major, VDCBLK_NAME);
863 vdc_major = 0;
864
865out_err:
866 return err;
867}
868
869static void __exit vdc_exit(void)
870{
871 vio_unregister_driver(&vdc_port_driver);
667ef3c3
DM		 872 unregister_blkdev(vdc_major, VDCBLK_NAME);
873}
874
875module_init(vdc_init);
876module_exit(vdc_exit);
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