]> Git Repo - linux.git/blame - drivers/block/sunvdc.c
projects / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
V4L/DVB (6806): Allow emulating changes of video std by vivi
[linux.git] / drivers / block / sunvdc.c
CommitLineData
667ef3c3
DM		 1/* sunvdc.c: Sun LDOM Virtual Disk Client.
2 *
3 * Copyright (C) 2007 David S. Miller <[email protected]>
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
106static struct block_device_operations vdc_fops = {
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
156 viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n",
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
167 viodbg(HS, "GOT ATTR stype[0x%x] ops[%lx] disk_size[%lu] disk_type[%x] "
168 "xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n",
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
215static void vdc_end_request(struct request *req, int uptodate, int num_sectors)
216{
217 if (end_that_request_first(req, uptodate, num_sectors))
218 return;
219 add_disk_randomness(req->rq_disk);
220 end_that_request_last(req, uptodate);
221}
222
223static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
224 unsigned int index)
225{
226 struct vio_disk_desc *desc = vio_dring_entry(dr, index);
227 struct vdc_req_entry *rqe = &port->rq_arr[index];
228 struct request *req;
229
230 if (unlikely(desc->hdr.state != VIO_DESC_DONE))
231 return;
232
233 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
234 desc->hdr.state = VIO_DESC_FREE;
235 dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1);
236
237 req = rqe->req;
238 if (req == NULL) {
239 vdc_end_special(port, desc);
240 return;
241 }
242
243 rqe->req = NULL;
244
245 vdc_end_request(req, !desc->status, desc->size >> 9);
246
247 if (blk_queue_stopped(port->disk->queue))
248 blk_start_queue(port->disk->queue);
249}
250
251static int vdc_ack(struct vdc_port *port, void *msgbuf)
252{
253 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
254 struct vio_dring_data *pkt = msgbuf;
255
256 if (unlikely(pkt->dring_ident != dr->ident ||
257 pkt->start_idx != pkt->end_idx ||
258 pkt->start_idx >= VDC_TX_RING_SIZE))
259 return 0;
260
261 vdc_end_one(port, dr, pkt->start_idx);
262
263 return 0;
264}
265
266static int vdc_nack(struct vdc_port *port, void *msgbuf)
267{
268 /* XXX Implement me XXX */
269 return 0;
270}
271
272static void vdc_event(void *arg, int event)
273{
274 struct vdc_port *port = arg;
275 struct vio_driver_state *vio = &port->vio;
276 unsigned long flags;
277 int err;
278
279 spin_lock_irqsave(&vio->lock, flags);
280
281 if (unlikely(event == LDC_EVENT_RESET ||
282 event == LDC_EVENT_UP)) {
283 vio_link_state_change(vio, event);
284 spin_unlock_irqrestore(&vio->lock, flags);
285 return;
286 }
287
288 if (unlikely(event != LDC_EVENT_DATA_READY)) {
289 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
290 spin_unlock_irqrestore(&vio->lock, flags);
291 return;
292 }
293
294 err = 0;
295 while (1) {
296 union {
297 struct vio_msg_tag tag;
298 u64 raw[8];
299 } msgbuf;
300
301 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
302 if (unlikely(err < 0)) {
303 if (err == -ECONNRESET)
304 vio_conn_reset(vio);
305 break;
306 }
307 if (err == 0)
308 break;
309 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
310 msgbuf.tag.type,
311 msgbuf.tag.stype,
312 msgbuf.tag.stype_env,
313 msgbuf.tag.sid);
314 err = vio_validate_sid(vio, &msgbuf.tag);
315 if (err < 0)
316 break;
317
318 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
319 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
320 err = vdc_ack(port, &msgbuf);
321 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
322 err = vdc_nack(port, &msgbuf);
323 else
324 err = vdc_handle_unknown(port, &msgbuf);
325 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
326 err = vio_control_pkt_engine(vio, &msgbuf);
327 } else {
328 err = vdc_handle_unknown(port, &msgbuf);
329 }
330 if (err < 0)
331 break;
332 }
333 if (err < 0)
334 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
335 spin_unlock_irqrestore(&vio->lock, flags);
336}
337
338static int __vdc_tx_trigger(struct vdc_port *port)
339{
340 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
341 struct vio_dring_data hdr = {
342 .tag = {
343 .type = VIO_TYPE_DATA,
344 .stype = VIO_SUBTYPE_INFO,
345 .stype_env = VIO_DRING_DATA,
346 .sid = vio_send_sid(&port->vio),
347 },
348 .dring_ident = dr->ident,
349 .start_idx = dr->prod,
350 .end_idx = dr->prod,
351 };
352 int err, delay;
353
354 hdr.seq = dr->snd_nxt;
355 delay = 1;
356 do {
357 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
358 if (err > 0) {
359 dr->snd_nxt++;
360 break;
361 }
362 udelay(delay);
363 if ((delay <<= 1) > 128)
364 delay = 128;
365 } while (err == -EAGAIN);
366
367 return err;
368}
369
370static int __send_request(struct request *req)
371{
372 struct vdc_port *port = req->rq_disk->private_data;
373 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
374 struct scatterlist sg[port->ring_cookies];
375 struct vdc_req_entry *rqe;
376 struct vio_disk_desc *desc;
377 unsigned int map_perm;
378 int nsg, err, i;
379 u64 len;
380 u8 op;
381
382 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
383
384 if (rq_data_dir(req) == READ) {
385 map_perm |= LDC_MAP_W;
386 op = VD_OP_BREAD;
387 } else {
388 map_perm |= LDC_MAP_R;
389 op = VD_OP_BWRITE;
390 }
391
45711f1a 392 sg_init_table(sg, port->ring_cookies);
667ef3c3
DM		 393 nsg = blk_rq_map_sg(req->q, req, sg);
394
395 len = 0;
396 for (i = 0; i < nsg; i++)
397 len += sg[i].length;
398
399 if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
400 blk_stop_queue(port->disk->queue);
401 err = -ENOMEM;
402 goto out;
403 }
404
405 desc = vio_dring_cur(dr);
406
407 err = ldc_map_sg(port->vio.lp, sg, nsg,
408 desc->cookies, port->ring_cookies,
409 map_perm);
410 if (err < 0) {
411 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
412 return err;
413 }
414
415 rqe = &port->rq_arr[dr->prod];
416 rqe->req = req;
417
418 desc->hdr.ack = VIO_ACK_ENABLE;
419 desc->req_id = port->req_id;
420 desc->operation = op;
421 if (port->vdisk_type == VD_DISK_TYPE_DISK) {
1bd4b280 422 desc->slice = 0xff;
667ef3c3
DM		 423 } else {
424 desc->slice = 0;
425 }
426 desc->status = ~0;
427 desc->offset = (req->sector << 9) / port->vdisk_block_size;
428 desc->size = len;
429 desc->ncookies = err;
430
431 /* This has to be a non-SMP write barrier because we are writing
432 * to memory which is shared with the peer LDOM.
433 */
434 wmb();
435 desc->hdr.state = VIO_DESC_READY;
436
437 err = __vdc_tx_trigger(port);
438 if (err < 0) {
439 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
440 } else {
441 port->req_id++;
442 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
443 }
444out:
445
446 return err;
447}
448
165125e1 449static void do_vdc_request(struct request_queue *q)
667ef3c3
DM		 450{
451 while (1) {
452 struct request *req = elv_next_request(q);
453
454 if (!req)
455 break;
456
457 blkdev_dequeue_request(req);
458 if (__send_request(req) < 0)
459 vdc_end_request(req, 0, req->hard_nr_sectors);
460 }
461}
462
463static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
464{
465 struct vio_dring_state *dr;
466 struct vio_completion comp;
467 struct vio_disk_desc *desc;
468 unsigned int map_perm;
469 unsigned long flags;
470 int op_len, err;
471 void *req_buf;
472
473 if (!(((u64)1 << ((u64)op - 1)) & port->operations))
474 return -EOPNOTSUPP;
475
476 switch (op) {
477 case VD_OP_BREAD:
478 case VD_OP_BWRITE:
479 default:
480 return -EINVAL;
481
482 case VD_OP_FLUSH:
483 op_len = 0;
484 map_perm = 0;
485 break;
486
487 case VD_OP_GET_WCE:
488 op_len = sizeof(u32);
489 map_perm = LDC_MAP_W;
490 break;
491
492 case VD_OP_SET_WCE:
493 op_len = sizeof(u32);
494 map_perm = LDC_MAP_R;
495 break;
496
497 case VD_OP_GET_VTOC:
498 op_len = sizeof(struct vio_disk_vtoc);
499 map_perm = LDC_MAP_W;
500 break;
501
502 case VD_OP_SET_VTOC:
503 op_len = sizeof(struct vio_disk_vtoc);
504 map_perm = LDC_MAP_R;
505 break;
506
507 case VD_OP_GET_DISKGEOM:
508 op_len = sizeof(struct vio_disk_geom);
509 map_perm = LDC_MAP_W;
510 break;
511
512 case VD_OP_SET_DISKGEOM:
513 op_len = sizeof(struct vio_disk_geom);
514 map_perm = LDC_MAP_R;
515 break;
516
517 case VD_OP_SCSICMD:
518 op_len = 16;
519 map_perm = LDC_MAP_RW;
520 break;
521
522 case VD_OP_GET_DEVID:
523 op_len = sizeof(struct vio_disk_devid);
524 map_perm = LDC_MAP_W;
525 break;
526
527 case VD_OP_GET_EFI:
528 case VD_OP_SET_EFI:
529 return -EOPNOTSUPP;
530 break;
531 };
532
533 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
534
535 op_len = (op_len + 7) & ~7;
536 req_buf = kzalloc(op_len, GFP_KERNEL);
537 if (!req_buf)
538 return -ENOMEM;
539
540 if (len > op_len)
541 len = op_len;
542
543 if (map_perm & LDC_MAP_R)
544 memcpy(req_buf, buf, len);
545
546 spin_lock_irqsave(&port->vio.lock, flags);
547
548 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
549
550 /* XXX If we want to use this code generically we have to
551 * XXX handle TX ring exhaustion etc.
552 */
553 desc = vio_dring_cur(dr);
554
555 err = ldc_map_single(port->vio.lp, req_buf, op_len,
556 desc->cookies, port->ring_cookies,
557 map_perm);
558 if (err < 0) {
559 spin_unlock_irqrestore(&port->vio.lock, flags);
560 kfree(req_buf);
561 return err;
562 }
563
564 init_completion(&comp.com);
565 comp.waiting_for = WAITING_FOR_GEN_CMD;
566 port->vio.cmp = &comp;
567
568 desc->hdr.ack = VIO_ACK_ENABLE;
569 desc->req_id = port->req_id;
570 desc->operation = op;
571 desc->slice = 0;
572 desc->status = ~0;
573 desc->offset = 0;
574 desc->size = op_len;
575 desc->ncookies = err;
576
577 /* This has to be a non-SMP write barrier because we are writing
578 * to memory which is shared with the peer LDOM.
579 */
580 wmb();
581 desc->hdr.state = VIO_DESC_READY;
582
583 err = __vdc_tx_trigger(port);
584 if (err >= 0) {
585 port->req_id++;
586 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
587 spin_unlock_irqrestore(&port->vio.lock, flags);
588
589 wait_for_completion(&comp.com);
590 err = comp.err;
591 } else {
592 port->vio.cmp = NULL;
593 spin_unlock_irqrestore(&port->vio.lock, flags);
594 }
595
596 if (map_perm & LDC_MAP_W)
597 memcpy(buf, req_buf, len);
598
599 kfree(req_buf);
600
601 return err;
602}
603
604static int __devinit vdc_alloc_tx_ring(struct vdc_port *port)
605{
606 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
607 unsigned long len, entry_size;
608 int ncookies;
609 void *dring;
610
611 entry_size = sizeof(struct vio_disk_desc) +
612 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
613 len = (VDC_TX_RING_SIZE * entry_size);
614
615 ncookies = VIO_MAX_RING_COOKIES;
616 dring = ldc_alloc_exp_dring(port->vio.lp, len,
617 dr->cookies, &ncookies,
618 (LDC_MAP_SHADOW |
619 LDC_MAP_DIRECT |
620 LDC_MAP_RW));
621 if (IS_ERR(dring))
622 return PTR_ERR(dring);
623
624 dr->base = dring;
625 dr->entry_size = entry_size;
626 dr->num_entries = VDC_TX_RING_SIZE;
627 dr->prod = dr->cons = 0;
628 dr->pending = VDC_TX_RING_SIZE;
629 dr->ncookies = ncookies;
630
631 return 0;
632}
633
634static void vdc_free_tx_ring(struct vdc_port *port)
635{
636 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
637
638 if (dr->base) {
639 ldc_free_exp_dring(port->vio.lp, dr->base,
640 (dr->entry_size * dr->num_entries),
641 dr->cookies, dr->ncookies);
642 dr->base = NULL;
643 dr->entry_size = 0;
644 dr->num_entries = 0;
645 dr->pending = 0;
646 dr->ncookies = 0;
647 }
648}
649
650static int probe_disk(struct vdc_port *port)
651{
652 struct vio_completion comp;
653 struct request_queue *q;
654 struct gendisk *g;
655 int err;
656
657 init_completion(&comp.com);
658 comp.err = 0;
659 comp.waiting_for = WAITING_FOR_LINK_UP;
660 port->vio.cmp = &comp;
661
662 vio_port_up(&port->vio);
663
664 wait_for_completion(&comp.com);
665 if (comp.err)
666 return comp.err;
667
668 err = generic_request(port, VD_OP_GET_VTOC,
669 &port->label, sizeof(port->label));
670 if (err < 0) {
671 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err);
672 return err;
673 }
674
675 err = generic_request(port, VD_OP_GET_DISKGEOM,
676 &port->geom, sizeof(port->geom));
677 if (err < 0) {
678 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
679 "error %d\n", err);
680 return err;
681 }
682
683 port->vdisk_size = ((u64)port->geom.num_cyl *
684 (u64)port->geom.num_hd *
685 (u64)port->geom.num_sec);
686
687 q = blk_init_queue(do_vdc_request, &port->vio.lock);
688 if (!q) {
689 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
690 port->vio.name);
691 return -ENOMEM;
692 }
693 g = alloc_disk(1 << PARTITION_SHIFT);
694 if (!g) {
695 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
696 port->vio.name);
697 blk_cleanup_queue(q);
698 return -ENOMEM;
699 }
700
701 port->disk = g;
702
703 blk_queue_max_hw_segments(q, port->ring_cookies);
704 blk_queue_max_phys_segments(q, port->ring_cookies);
705 blk_queue_max_sectors(q, port->max_xfer_size);
706 g->major = vdc_major;
91ba3c21 707 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
667ef3c3
DM		 708 strcpy(g->disk_name, port->disk_name);
709
710 g->fops = &vdc_fops;
711 g->queue = q;
712 g->private_data = port;
713 g->driverfs_dev = &port->vio.vdev->dev;
714
715 set_capacity(g, port->vdisk_size);
716
717 printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n",
718 g->disk_name,
719 port->vdisk_size, (port->vdisk_size >> (20 - 9)));
720
721 add_disk(g);
722
723 return 0;
724}
725
726static struct ldc_channel_config vdc_ldc_cfg = {
727 .event = vdc_event,
728 .mtu = 64,
729 .mode = LDC_MODE_UNRELIABLE,
730};
731
732static struct vio_driver_ops vdc_vio_ops = {
733 .send_attr = vdc_send_attr,
734 .handle_attr = vdc_handle_attr,
735 .handshake_complete = vdc_handshake_complete,
736};
737
80dc35df
DM		 738static void print_version(void)
739{
740 static int version_printed;
741
742 if (version_printed++ == 0)
743 printk(KERN_INFO "%s", version);
744}
745
667ef3c3
DM		 746static int __devinit vdc_port_probe(struct vio_dev *vdev,
747 const struct vio_device_id *id)
748{
43fdf274 749 struct mdesc_handle *hp;
667ef3c3 750 struct vdc_port *port;
667ef3c3
DM		 751 int err;
752
80dc35df 753 print_version();
667ef3c3 754
43fdf274 755 hp = mdesc_grab();
667ef3c3 756
43fdf274 757 err = -ENODEV;
91ba3c21
DM		 758 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
759 printk(KERN_ERR PFX "Port id [%lu] too large.\n",
760 vdev->dev_no);
43fdf274 761 goto err_out_release_mdesc;
667ef3c3
DM		 762 }
763
764 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 765 err = -ENOMEM;
667ef3c3
DM		 766 if (!port) {
767 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
43fdf274 768 goto err_out_release_mdesc;
667ef3c3
DM		 769 }
770
91ba3c21 771 if (vdev->dev_no >= 26)
667ef3c3
DM		 772 snprintf(port->disk_name, sizeof(port->disk_name),
773 VDCBLK_NAME "%c%c",
91ba3c21
DM		 774 'a' + ((int)vdev->dev_no / 26) - 1,
775 'a' + ((int)vdev->dev_no % 26));
667ef3c3
DM		 776 else
777 snprintf(port->disk_name, sizeof(port->disk_name),
91ba3c21 778 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
667ef3c3 779
43fdf274 780 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
667ef3c3
DM		 781 vdc_versions, ARRAY_SIZE(vdc_versions),
782 &vdc_vio_ops, port->disk_name);
783 if (err)
784 goto err_out_free_port;
785
786 port->vdisk_block_size = 512;
787 port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
788 port->ring_cookies = ((port->max_xfer_size *
789 port->vdisk_block_size) / PAGE_SIZE) + 2;
790
791 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
792 if (err)
793 goto err_out_free_port;
794
795 err = vdc_alloc_tx_ring(port);
796 if (err)
797 goto err_out_free_ldc;
798
799 err = probe_disk(port);
800 if (err)
801 goto err_out_free_tx_ring;
802
667ef3c3
DM		 803 dev_set_drvdata(&vdev->dev, port);
804
43fdf274
DM		 805 mdesc_release(hp);
806
667ef3c3
DM		 807 return 0;
808
809err_out_free_tx_ring:
810 vdc_free_tx_ring(port);
811
812err_out_free_ldc:
813 vio_ldc_free(&port->vio);
814
815err_out_free_port:
816 kfree(port);
817
43fdf274
DM		 818err_out_release_mdesc:
819 mdesc_release(hp);
667ef3c3
DM		 820 return err;
821}
822
823static int vdc_port_remove(struct vio_dev *vdev)
824{
825 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
826
827 if (port) {
828 del_timer_sync(&port->vio.timer);
829
830 vdc_free_tx_ring(port);
831 vio_ldc_free(&port->vio);
832
833 dev_set_drvdata(&vdev->dev, NULL);
834
835 kfree(port);
836 }
837 return 0;
838}
839
840static struct vio_device_id vdc_port_match[] = {
841 {
842 .type = "vdc-port",
843 },
844 {},
845};
da68e081 846MODULE_DEVICE_TABLE(vio, vdc_port_match);
667ef3c3
DM		 847
848static struct vio_driver vdc_port_driver = {
849 .id_table = vdc_port_match,
850 .probe = vdc_port_probe,
851 .remove = vdc_port_remove,
852 .driver = {
853 .name = "vdc_port",
854 .owner = THIS_MODULE,
855 }
856};
857
667ef3c3
DM		 858static int __init vdc_init(void)
859{
860 int err;
861
862 err = register_blkdev(0, VDCBLK_NAME);
863 if (err < 0)
864 goto out_err;
865
866 vdc_major = err;
667ef3c3
DM		 867
868 err = vio_register_driver(&vdc_port_driver);
869 if (err)
80dc35df 870 goto out_unregister_blkdev;
667ef3c3
DM		 871
872 return 0;
873
667ef3c3
DM		 874out_unregister_blkdev:
875 unregister_blkdev(vdc_major, VDCBLK_NAME);
876 vdc_major = 0;
877
878out_err:
879 return err;
880}
881
882static void __exit vdc_exit(void)
883{
884 vio_unregister_driver(&vdc_port_driver);
667ef3c3
DM		 885 unregister_blkdev(vdc_major, VDCBLK_NAME);
886}
887
888module_init(vdc_init);
889module_exit(vdc_exit);
Empty description
This page took 0.248278 seconds and 4 git commands to generate.