projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[SPARC]: Add sys_fallocate() entries.
[linux-2.6-block.git] / drivers / block / sunvdc.c
CommitLineData
667ef3c3
DM		 1/* sunvdc.c: Sun LDOM Virtual Disk Client.
2 *
3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
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>
18
19#include <asm/vio.h>
20#include <asm/ldc.h>
21
22#define DRV_MODULE_NAME "sunvdc"
23#define PFX DRV_MODULE_NAME ": "
24#define DRV_MODULE_VERSION "1.0"
25#define DRV_MODULE_RELDATE "June 25, 2007"
26
27static char version[] __devinitdata =
28 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
29MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
30MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
31MODULE_LICENSE("GPL");
32MODULE_VERSION(DRV_MODULE_VERSION);
33
34#define VDC_TX_RING_SIZE 256
35
36#define WAITING_FOR_LINK_UP 0x01
37#define WAITING_FOR_TX_SPACE 0x02
38#define WAITING_FOR_GEN_CMD 0x04
39#define WAITING_FOR_ANY -1
40
41struct vdc_req_entry {
42 struct request *req;
43};
44
45struct vdc_port {
46 struct vio_driver_state vio;
47
667ef3c3
DM		 48 struct gendisk *disk;
49
50 struct vdc_completion *cmp;
51
52 u64 req_id;
53 u64 seq;
54 struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE];
55
56 unsigned long ring_cookies;
57
58 u64 max_xfer_size;
59 u32 vdisk_block_size;
60
61 /* The server fills these in for us in the disk attribute
62 * ACK packet.
63 */
64 u64 operations;
65 u32 vdisk_size;
66 u8 vdisk_type;
67 u8 dev_no;
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
392 nsg = blk_rq_map_sg(req->q, req, sg);
393
394 len = 0;
395 for (i = 0; i < nsg; i++)
396 len += sg[i].length;
397
398 if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
399 blk_stop_queue(port->disk->queue);
400 err = -ENOMEM;
401 goto out;
402 }
403
404 desc = vio_dring_cur(dr);
405
406 err = ldc_map_sg(port->vio.lp, sg, nsg,
407 desc->cookies, port->ring_cookies,
408 map_perm);
409 if (err < 0) {
410 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
411 return err;
412 }
413
414 rqe = &port->rq_arr[dr->prod];
415 rqe->req = req;
416
417 desc->hdr.ack = VIO_ACK_ENABLE;
418 desc->req_id = port->req_id;
419 desc->operation = op;
420 if (port->vdisk_type == VD_DISK_TYPE_DISK) {
421 desc->slice = 2;
422 } else {
423 desc->slice = 0;
424 }
425 desc->status = ~0;
426 desc->offset = (req->sector << 9) / port->vdisk_block_size;
427 desc->size = len;
428 desc->ncookies = err;
429
430 /* This has to be a non-SMP write barrier because we are writing
431 * to memory which is shared with the peer LDOM.
432 */
433 wmb();
434 desc->hdr.state = VIO_DESC_READY;
435
436 err = __vdc_tx_trigger(port);
437 if (err < 0) {
438 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
439 } else {
440 port->req_id++;
441 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
442 }
443out:
444
445 return err;
446}
447
448static void do_vdc_request(request_queue_t *q)
449{
450 while (1) {
451 struct request *req = elv_next_request(q);
452
453 if (!req)
454 break;
455
456 blkdev_dequeue_request(req);
457 if (__send_request(req) < 0)
458 vdc_end_request(req, 0, req->hard_nr_sectors);
459 }
460}
461
462static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
463{
464 struct vio_dring_state *dr;
465 struct vio_completion comp;
466 struct vio_disk_desc *desc;
467 unsigned int map_perm;
468 unsigned long flags;
469 int op_len, err;
470 void *req_buf;
471
472 if (!(((u64)1 << ((u64)op - 1)) & port->operations))
473 return -EOPNOTSUPP;
474
475 switch (op) {
476 case VD_OP_BREAD:
477 case VD_OP_BWRITE:
478 default:
479 return -EINVAL;
480
481 case VD_OP_FLUSH:
482 op_len = 0;
483 map_perm = 0;
484 break;
485
486 case VD_OP_GET_WCE:
487 op_len = sizeof(u32);
488 map_perm = LDC_MAP_W;
489 break;
490
491 case VD_OP_SET_WCE:
492 op_len = sizeof(u32);
493 map_perm = LDC_MAP_R;
494 break;
495
496 case VD_OP_GET_VTOC:
497 op_len = sizeof(struct vio_disk_vtoc);
498 map_perm = LDC_MAP_W;
499 break;
500
501 case VD_OP_SET_VTOC:
502 op_len = sizeof(struct vio_disk_vtoc);
503 map_perm = LDC_MAP_R;
504 break;
505
506 case VD_OP_GET_DISKGEOM:
507 op_len = sizeof(struct vio_disk_geom);
508 map_perm = LDC_MAP_W;
509 break;
510
511 case VD_OP_SET_DISKGEOM:
512 op_len = sizeof(struct vio_disk_geom);
513 map_perm = LDC_MAP_R;
514 break;
515
516 case VD_OP_SCSICMD:
517 op_len = 16;
518 map_perm = LDC_MAP_RW;
519 break;
520
521 case VD_OP_GET_DEVID:
522 op_len = sizeof(struct vio_disk_devid);
523 map_perm = LDC_MAP_W;
524 break;
525
526 case VD_OP_GET_EFI:
527 case VD_OP_SET_EFI:
528 return -EOPNOTSUPP;
529 break;
530 };
531
532 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
533
534 op_len = (op_len + 7) & ~7;
535 req_buf = kzalloc(op_len, GFP_KERNEL);
536 if (!req_buf)
537 return -ENOMEM;
538
539 if (len > op_len)
540 len = op_len;
541
542 if (map_perm & LDC_MAP_R)
543 memcpy(req_buf, buf, len);
544
545 spin_lock_irqsave(&port->vio.lock, flags);
546
547 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
548
549 /* XXX If we want to use this code generically we have to
550 * XXX handle TX ring exhaustion etc.
551 */
552 desc = vio_dring_cur(dr);
553
554 err = ldc_map_single(port->vio.lp, req_buf, op_len,
555 desc->cookies, port->ring_cookies,
556 map_perm);
557 if (err < 0) {
558 spin_unlock_irqrestore(&port->vio.lock, flags);
559 kfree(req_buf);
560 return err;
561 }
562
563 init_completion(&comp.com);
564 comp.waiting_for = WAITING_FOR_GEN_CMD;
565 port->vio.cmp = &comp;
566
567 desc->hdr.ack = VIO_ACK_ENABLE;
568 desc->req_id = port->req_id;
569 desc->operation = op;
570 desc->slice = 0;
571 desc->status = ~0;
572 desc->offset = 0;
573 desc->size = op_len;
574 desc->ncookies = err;
575
576 /* This has to be a non-SMP write barrier because we are writing
577 * to memory which is shared with the peer LDOM.
578 */
579 wmb();
580 desc->hdr.state = VIO_DESC_READY;
581
582 err = __vdc_tx_trigger(port);
583 if (err >= 0) {
584 port->req_id++;
585 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
586 spin_unlock_irqrestore(&port->vio.lock, flags);
587
588 wait_for_completion(&comp.com);
589 err = comp.err;
590 } else {
591 port->vio.cmp = NULL;
592 spin_unlock_irqrestore(&port->vio.lock, flags);
593 }
594
595 if (map_perm & LDC_MAP_W)
596 memcpy(buf, req_buf, len);
597
598 kfree(req_buf);
599
600 return err;
601}
602
603static int __devinit vdc_alloc_tx_ring(struct vdc_port *port)
604{
605 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
606 unsigned long len, entry_size;
607 int ncookies;
608 void *dring;
609
610 entry_size = sizeof(struct vio_disk_desc) +
611 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
612 len = (VDC_TX_RING_SIZE * entry_size);
613
614 ncookies = VIO_MAX_RING_COOKIES;
615 dring = ldc_alloc_exp_dring(port->vio.lp, len,
616 dr->cookies, &ncookies,
617 (LDC_MAP_SHADOW |
618 LDC_MAP_DIRECT |
619 LDC_MAP_RW));
620 if (IS_ERR(dring))
621 return PTR_ERR(dring);
622
623 dr->base = dring;
624 dr->entry_size = entry_size;
625 dr->num_entries = VDC_TX_RING_SIZE;
626 dr->prod = dr->cons = 0;
627 dr->pending = VDC_TX_RING_SIZE;
628 dr->ncookies = ncookies;
629
630 return 0;
631}
632
633static void vdc_free_tx_ring(struct vdc_port *port)
634{
635 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
636
637 if (dr->base) {
638 ldc_free_exp_dring(port->vio.lp, dr->base,
639 (dr->entry_size * dr->num_entries),
640 dr->cookies, dr->ncookies);
641 dr->base = NULL;
642 dr->entry_size = 0;
643 dr->num_entries = 0;
644 dr->pending = 0;
645 dr->ncookies = 0;
646 }
647}
648
649static int probe_disk(struct vdc_port *port)
650{
651 struct vio_completion comp;
652 struct request_queue *q;
653 struct gendisk *g;
654 int err;
655
656 init_completion(&comp.com);
657 comp.err = 0;
658 comp.waiting_for = WAITING_FOR_LINK_UP;
659 port->vio.cmp = &comp;
660
661 vio_port_up(&port->vio);
662
663 wait_for_completion(&comp.com);
664 if (comp.err)
665 return comp.err;
666
667 err = generic_request(port, VD_OP_GET_VTOC,
668 &port->label, sizeof(port->label));
669 if (err < 0) {
670 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err);
671 return err;
672 }
673
674 err = generic_request(port, VD_OP_GET_DISKGEOM,
675 &port->geom, sizeof(port->geom));
676 if (err < 0) {
677 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
678 "error %d\n", err);
679 return err;
680 }
681
682 port->vdisk_size = ((u64)port->geom.num_cyl *
683 (u64)port->geom.num_hd *
684 (u64)port->geom.num_sec);
685
686 q = blk_init_queue(do_vdc_request, &port->vio.lock);
687 if (!q) {
688 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
689 port->vio.name);
690 return -ENOMEM;
691 }
692 g = alloc_disk(1 << PARTITION_SHIFT);
693 if (!g) {
694 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
695 port->vio.name);
696 blk_cleanup_queue(q);
697 return -ENOMEM;
698 }
699
700 port->disk = g;
701
702 blk_queue_max_hw_segments(q, port->ring_cookies);
703 blk_queue_max_phys_segments(q, port->ring_cookies);
704 blk_queue_max_sectors(q, port->max_xfer_size);
705 g->major = vdc_major;
706 g->first_minor = port->dev_no << PARTITION_SHIFT;
707 strcpy(g->disk_name, port->disk_name);
708
709 g->fops = &vdc_fops;
710 g->queue = q;
711 g->private_data = port;
712 g->driverfs_dev = &port->vio.vdev->dev;
713
714 set_capacity(g, port->vdisk_size);
715
716 printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n",
717 g->disk_name,
718 port->vdisk_size, (port->vdisk_size >> (20 - 9)));
719
720 add_disk(g);
721
722 return 0;
723}
724
725static struct ldc_channel_config vdc_ldc_cfg = {
726 .event = vdc_event,
727 .mtu = 64,
728 .mode = LDC_MODE_UNRELIABLE,
729};
730
731static struct vio_driver_ops vdc_vio_ops = {
732 .send_attr = vdc_send_attr,
733 .handle_attr = vdc_handle_attr,
734 .handshake_complete = vdc_handshake_complete,
735};
736
80dc35df
DM		 737static void print_version(void)
738{
739 static int version_printed;
740
741 if (version_printed++ == 0)
742 printk(KERN_INFO "%s", version);
743}
744
667ef3c3
DM		 745static int __devinit vdc_port_probe(struct vio_dev *vdev,
746 const struct vio_device_id *id)
747{
43fdf274 748 struct mdesc_handle *hp;
667ef3c3 749 struct vdc_port *port;
667ef3c3
DM		 750 const u64 *port_id;
751 int err;
752
80dc35df 753 print_version();
667ef3c3 754
43fdf274 755 hp = mdesc_grab();
667ef3c3 756
43fdf274
DM		 757 port_id = mdesc_get_property(hp, vdev->mp, "id", NULL);
758 err = -ENODEV;
667ef3c3
DM		 759 if (!port_id) {
760 printk(KERN_ERR PFX "Port lacks id property.\n");
43fdf274 761 goto err_out_release_mdesc;
667ef3c3
DM		 762 }
763 if ((*port_id << PARTITION_SHIFT) & ~(u64)MINORMASK) {
764 printk(KERN_ERR PFX "Port id [%lu] too large.\n", *port_id);
43fdf274 765 goto err_out_release_mdesc;
667ef3c3
DM		 766 }
767
768 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 769 err = -ENOMEM;
667ef3c3
DM		 770 if (!port) {
771 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
43fdf274 772 goto err_out_release_mdesc;
667ef3c3
DM		 773 }
774
667ef3c3
DM		 775 port->dev_no = *port_id;
776
777 if (port->dev_no >= 26)
778 snprintf(port->disk_name, sizeof(port->disk_name),
779 VDCBLK_NAME "%c%c",
780 'a' + (port->dev_no / 26) - 1,
781 'a' + (port->dev_no % 26));
782 else
783 snprintf(port->disk_name, sizeof(port->disk_name),
784 VDCBLK_NAME "%c", 'a' + (port->dev_no % 26));
785
43fdf274 786 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
667ef3c3
DM		 787 vdc_versions, ARRAY_SIZE(vdc_versions),
788 &vdc_vio_ops, port->disk_name);
789 if (err)
790 goto err_out_free_port;
791
792 port->vdisk_block_size = 512;
793 port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
794 port->ring_cookies = ((port->max_xfer_size *
795 port->vdisk_block_size) / PAGE_SIZE) + 2;
796
797 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
798 if (err)
799 goto err_out_free_port;
800
801 err = vdc_alloc_tx_ring(port);
802 if (err)
803 goto err_out_free_ldc;
804
805 err = probe_disk(port);
806 if (err)
807 goto err_out_free_tx_ring;
808
667ef3c3
DM		 809 dev_set_drvdata(&vdev->dev, port);
810
43fdf274
DM		 811 mdesc_release(hp);
812
667ef3c3
DM		 813 return 0;
814
815err_out_free_tx_ring:
816 vdc_free_tx_ring(port);
817
818err_out_free_ldc:
819 vio_ldc_free(&port->vio);
820
821err_out_free_port:
822 kfree(port);
823
43fdf274
DM		 824err_out_release_mdesc:
825 mdesc_release(hp);
667ef3c3
DM		 826 return err;
827}
828
829static int vdc_port_remove(struct vio_dev *vdev)
830{
831 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
832
833 if (port) {
834 del_timer_sync(&port->vio.timer);
835
836 vdc_free_tx_ring(port);
837 vio_ldc_free(&port->vio);
838
839 dev_set_drvdata(&vdev->dev, NULL);
840
841 kfree(port);
842 }
843 return 0;
844}
845
846static struct vio_device_id vdc_port_match[] = {
847 {
848 .type = "vdc-port",
849 },
850 {},
851};
852MODULE_DEVICE_TABLE(vio, vdc_match);
853
854static struct vio_driver vdc_port_driver = {
855 .id_table = vdc_port_match,
856 .probe = vdc_port_probe,
857 .remove = vdc_port_remove,
858 .driver = {
859 .name = "vdc_port",
860 .owner = THIS_MODULE,
861 }
862};
863
667ef3c3
DM		 864static int __init vdc_init(void)
865{
866 int err;
867
868 err = register_blkdev(0, VDCBLK_NAME);
869 if (err < 0)
870 goto out_err;
871
872 vdc_major = err;
667ef3c3
DM		 873
874 err = vio_register_driver(&vdc_port_driver);
875 if (err)
80dc35df 876 goto out_unregister_blkdev;
667ef3c3
DM		 877
878 return 0;
879
667ef3c3
DM		 880out_unregister_blkdev:
881 unregister_blkdev(vdc_major, VDCBLK_NAME);
882 vdc_major = 0;
883
884out_err:
885 return err;
886}
887
888static void __exit vdc_exit(void)
889{
890 vio_unregister_driver(&vdc_port_driver);
667ef3c3
DM		 891 unregister_blkdev(vdc_major, VDCBLK_NAME);
892}
893
894module_init(vdc_init);
895module_exit(vdc_exit);
Linux 6.x block layer and io_uring tree(s)