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Linux 4.19.133
[linux/fpc-iii.git] / drivers / block / sunvdc.c
blob5d7024057540aa154854686c3b48337d4226db5b
1 /* sunvdc.c: Sun LDOM Virtual Disk Client.
2 *
3 * Copyright (C) 2007, 2008 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/cdrom.h>
13 #include <linux/slab.h>
14 #include <linux/spinlock.h>
15 #include <linux/completion.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/scatterlist.h>
20
21 #include <asm/vio.h>
22 #include <asm/ldc.h>
23
24 #define DRV_MODULE_NAME "sunvdc"
25 #define PFX DRV_MODULE_NAME ": "
26 #define DRV_MODULE_VERSION "1.2"
27 #define DRV_MODULE_RELDATE "November 24, 2014"
28
29 static char version[] =
30 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
31 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
32 MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
33 MODULE_LICENSE("GPL");
34 MODULE_VERSION(DRV_MODULE_VERSION);
35
36 #define VDC_TX_RING_SIZE 512
37 #define VDC_DEFAULT_BLK_SIZE 512
38
39 #define MAX_XFER_BLKS (128 * 1024)
40 #define MAX_XFER_SIZE (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE)
41 #define MAX_RING_COOKIES ((MAX_XFER_BLKS / PAGE_SIZE) + 2)
42
43 #define WAITING_FOR_LINK_UP 0x01
44 #define WAITING_FOR_TX_SPACE 0x02
45 #define WAITING_FOR_GEN_CMD 0x04
46 #define WAITING_FOR_ANY -1
47
48 #define VDC_MAX_RETRIES 10
49
50 static struct workqueue_struct *sunvdc_wq;
51
52 struct vdc_req_entry {
53 struct request *req;
54 };
55
56 struct vdc_port {
57 struct vio_driver_state vio;
58
59 struct gendisk *disk;
60
61 struct vdc_completion *cmp;
62
63 u64 req_id;
64 u64 seq;
65 struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE];
66
67 unsigned long ring_cookies;
68
69 u64 max_xfer_size;
70 u32 vdisk_block_size;
71
72 u64 ldc_timeout;
73 struct timer_list ldc_reset_timer;
74 struct work_struct ldc_reset_work;
75
76 /* The server fills these in for us in the disk attribute
77 * ACK packet.
78 */
79 u64 operations;
80 u32 vdisk_size;
81 u8 vdisk_type;
82 u8 vdisk_mtype;
83 u32 vdisk_phys_blksz;
84
85 char disk_name[32];
86 };
87
88 static void vdc_ldc_reset(struct vdc_port *port);
89 static void vdc_ldc_reset_work(struct work_struct *work);
90 static void vdc_ldc_reset_timer(struct timer_list *t);
91
92 static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
93 {
94 return container_of(vio, struct vdc_port, vio);
95 }
96
97 /* Ordered from largest major to lowest */
98 static struct vio_version vdc_versions[] = {
99 { .major = 1, .minor = 2 },
100 { .major = 1, .minor = 1 },
101 { .major = 1, .minor = 0 },
102 };
103
104 static inline int vdc_version_supported(struct vdc_port *port,
105 u16 major, u16 minor)
106 {
107 return port->vio.ver.major == major && port->vio.ver.minor >= minor;
108 }
109
110 #define VDCBLK_NAME "vdisk"
111 static int vdc_major;
112 #define PARTITION_SHIFT 3
113
114 static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
115 {
116 return vio_dring_avail(dr, VDC_TX_RING_SIZE);
117 }
118
119 static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
120 {
121 struct gendisk *disk = bdev->bd_disk;
122 sector_t nsect = get_capacity(disk);
123 sector_t cylinders = nsect;
124
125 geo->heads = 0xff;
126 geo->sectors = 0x3f;
127 sector_div(cylinders, geo->heads * geo->sectors);
128 geo->cylinders = cylinders;
129 if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect)
130 geo->cylinders = 0xffff;
131
132 return 0;
133 }
134
135 /* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev
136 * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD.
137 * Needed to be able to install inside an ldom from an iso image.
138 */
139 static int vdc_ioctl(struct block_device *bdev, fmode_t mode,
140 unsigned command, unsigned long argument)
141 {
142 int i;
143 struct gendisk *disk;
144
145 switch (command) {
146 case CDROMMULTISESSION:
147 pr_debug(PFX "Multisession CDs not supported\n");
148 for (i = 0; i < sizeof(struct cdrom_multisession); i++)
149 if (put_user(0, (char __user *)(argument + i)))
150 return -EFAULT;
151 return 0;
152
153 case CDROM_GET_CAPABILITY:
154 disk = bdev->bd_disk;
155
156 if (bdev->bd_disk && (disk->flags & GENHD_FL_CD))
157 return 0;
158 return -EINVAL;
159
160 default:
161 pr_debug(PFX "ioctl %08x not supported\n", command);
162 return -EINVAL;
163 }
164 }
165
166 static const struct block_device_operations vdc_fops = {
167 .owner = THIS_MODULE,
168 .getgeo = vdc_getgeo,
169 .ioctl = vdc_ioctl,
170 };
171
172 static void vdc_blk_queue_start(struct vdc_port *port)
173 {
174 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
175
176 /* restart blk queue when ring is half emptied. also called after
177 * handshake completes, so check for initial handshake before we've
178 * allocated a disk.
179 */
180 if (port->disk && blk_queue_stopped(port->disk->queue) &&
181 vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50) {
182 blk_start_queue(port->disk->queue);
183 }
184
185 }
186
187 static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
188 {
189 if (vio->cmp &&
190 (waiting_for == -1 ||
191 vio->cmp->waiting_for == waiting_for)) {
192 vio->cmp->err = err;
193 complete(&vio->cmp->com);
194 vio->cmp = NULL;
195 }
196 }
197
198 static void vdc_handshake_complete(struct vio_driver_state *vio)
199 {
200 struct vdc_port *port = to_vdc_port(vio);
201
202 del_timer(&port->ldc_reset_timer);
203 vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
204 vdc_blk_queue_start(port);
205 }
206
207 static int vdc_handle_unknown(struct vdc_port *port, void *arg)
208 {
209 struct vio_msg_tag *pkt = arg;
210
211 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
212 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
213 printk(KERN_ERR PFX "Resetting connection.\n");
214
215 ldc_disconnect(port->vio.lp);
216
217 return -ECONNRESET;
218 }
219
220 static int vdc_send_attr(struct vio_driver_state *vio)
221 {
222 struct vdc_port *port = to_vdc_port(vio);
223 struct vio_disk_attr_info pkt;
224
225 memset(&pkt, 0, sizeof(pkt));
226
227 pkt.tag.type = VIO_TYPE_CTRL;
228 pkt.tag.stype = VIO_SUBTYPE_INFO;
229 pkt.tag.stype_env = VIO_ATTR_INFO;
230 pkt.tag.sid = vio_send_sid(vio);
231
232 pkt.xfer_mode = VIO_DRING_MODE;
233 pkt.vdisk_block_size = port->vdisk_block_size;
234 pkt.max_xfer_size = port->max_xfer_size;
235
236 viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
237 pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
238
239 return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
240 }
241
242 static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
243 {
244 struct vdc_port *port = to_vdc_port(vio);
245 struct vio_disk_attr_info *pkt = arg;
246
247 viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] "
248 "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
249 pkt->tag.stype, pkt->operations,
250 pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype,
251 pkt->xfer_mode, pkt->vdisk_block_size,
252 pkt->max_xfer_size);
253
254 if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
255 switch (pkt->vdisk_type) {
256 case VD_DISK_TYPE_DISK:
257 case VD_DISK_TYPE_SLICE:
258 break;
259
260 default:
261 printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
262 vio->name, pkt->vdisk_type);
263 return -ECONNRESET;
264 }
265
266 if (pkt->vdisk_block_size > port->vdisk_block_size) {
267 printk(KERN_ERR PFX "%s: BLOCK size increased "
268 "%u --> %u\n",
269 vio->name,
270 port->vdisk_block_size, pkt->vdisk_block_size);
271 return -ECONNRESET;
272 }
273
274 port->operations = pkt->operations;
275 port->vdisk_type = pkt->vdisk_type;
276 if (vdc_version_supported(port, 1, 1)) {
277 port->vdisk_size = pkt->vdisk_size;
278 port->vdisk_mtype = pkt->vdisk_mtype;
279 }
280 if (pkt->max_xfer_size < port->max_xfer_size)
281 port->max_xfer_size = pkt->max_xfer_size;
282 port->vdisk_block_size = pkt->vdisk_block_size;
283
284 port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE;
285 if (vdc_version_supported(port, 1, 2))
286 port->vdisk_phys_blksz = pkt->phys_block_size;
287
288 return 0;
289 } else {
290 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
291
292 return -ECONNRESET;
293 }
294 }
295
296 static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
297 {
298 int err = desc->status;
299
300 vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
301 }
302
303 static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
304 unsigned int index)
305 {
306 struct vio_disk_desc *desc = vio_dring_entry(dr, index);
307 struct vdc_req_entry *rqe = &port->rq_arr[index];
308 struct request *req;
309
310 if (unlikely(desc->hdr.state != VIO_DESC_DONE))
311 return;
312
313 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
314 desc->hdr.state = VIO_DESC_FREE;
315 dr->cons = vio_dring_next(dr, index);
316
317 req = rqe->req;
318 if (req == NULL) {
319 vdc_end_special(port, desc);
320 return;
321 }
322
323 rqe->req = NULL;
324
325 __blk_end_request(req, (desc->status ? BLK_STS_IOERR : 0), desc->size);
326
327 vdc_blk_queue_start(port);
328 }
329
330 static int vdc_ack(struct vdc_port *port, void *msgbuf)
331 {
332 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
333 struct vio_dring_data *pkt = msgbuf;
334
335 if (unlikely(pkt->dring_ident != dr->ident ||
336 pkt->start_idx != pkt->end_idx ||
337 pkt->start_idx >= VDC_TX_RING_SIZE))
338 return 0;
339
340 vdc_end_one(port, dr, pkt->start_idx);
341
342 return 0;
343 }
344
345 static int vdc_nack(struct vdc_port *port, void *msgbuf)
346 {
347 /* XXX Implement me XXX */
348 return 0;
349 }
350
351 static void vdc_event(void *arg, int event)
352 {
353 struct vdc_port *port = arg;
354 struct vio_driver_state *vio = &port->vio;
355 unsigned long flags;
356 int err;
357
358 spin_lock_irqsave(&vio->lock, flags);
359
360 if (unlikely(event == LDC_EVENT_RESET)) {
361 vio_link_state_change(vio, event);
362 queue_work(sunvdc_wq, &port->ldc_reset_work);
363 goto out;
364 }
365
366 if (unlikely(event == LDC_EVENT_UP)) {
367 vio_link_state_change(vio, event);
368 goto out;
369 }
370
371 if (unlikely(event != LDC_EVENT_DATA_READY)) {
372 pr_warn(PFX "Unexpected LDC event %d\n", event);
373 goto out;
374 }
375
376 err = 0;
377 while (1) {
378 union {
379 struct vio_msg_tag tag;
380 u64 raw[8];
381 } msgbuf;
382
383 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
384 if (unlikely(err < 0)) {
385 if (err == -ECONNRESET)
386 vio_conn_reset(vio);
387 break;
388 }
389 if (err == 0)
390 break;
391 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
392 msgbuf.tag.type,
393 msgbuf.tag.stype,
394 msgbuf.tag.stype_env,
395 msgbuf.tag.sid);
396 err = vio_validate_sid(vio, &msgbuf.tag);
397 if (err < 0)
398 break;
399
400 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
401 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
402 err = vdc_ack(port, &msgbuf);
403 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
404 err = vdc_nack(port, &msgbuf);
405 else
406 err = vdc_handle_unknown(port, &msgbuf);
407 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
408 err = vio_control_pkt_engine(vio, &msgbuf);
409 } else {
410 err = vdc_handle_unknown(port, &msgbuf);
411 }
412 if (err < 0)
413 break;
414 }
415 if (err < 0)
416 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
417 out:
418 spin_unlock_irqrestore(&vio->lock, flags);
419 }
420
421 static int __vdc_tx_trigger(struct vdc_port *port)
422 {
423 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
424 struct vio_dring_data hdr = {
425 .tag = {
426 .type = VIO_TYPE_DATA,
427 .stype = VIO_SUBTYPE_INFO,
428 .stype_env = VIO_DRING_DATA,
429 .sid = vio_send_sid(&port->vio),
430 },
431 .dring_ident = dr->ident,
432 .start_idx = dr->prod,
433 .end_idx = dr->prod,
434 };
435 int err, delay;
436 int retries = 0;
437
438 hdr.seq = dr->snd_nxt;
439 delay = 1;
440 do {
441 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
442 if (err > 0) {
443 dr->snd_nxt++;
444 break;
445 }
446 udelay(delay);
447 if ((delay <<= 1) > 128)
448 delay = 128;
449 if (retries++ > VDC_MAX_RETRIES)
450 break;
451 } while (err == -EAGAIN);
452
453 if (err == -ENOTCONN)
454 vdc_ldc_reset(port);
455 return err;
456 }
457
458 static int __send_request(struct request *req)
459 {
460 struct vdc_port *port = req->rq_disk->private_data;
461 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
462 struct scatterlist sg[MAX_RING_COOKIES];
463 struct vdc_req_entry *rqe;
464 struct vio_disk_desc *desc;
465 unsigned int map_perm;
466 int nsg, err, i;
467 u64 len;
468 u8 op;
469
470 if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES))
471 return -EINVAL;
472
473 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
474
475 if (rq_data_dir(req) == READ) {
476 map_perm |= LDC_MAP_W;
477 op = VD_OP_BREAD;
478 } else {
479 map_perm |= LDC_MAP_R;
480 op = VD_OP_BWRITE;
481 }
482
483 sg_init_table(sg, port->ring_cookies);
484 nsg = blk_rq_map_sg(req->q, req, sg);
485
486 len = 0;
487 for (i = 0; i < nsg; i++)
488 len += sg[i].length;
489
490 desc = vio_dring_cur(dr);
491
492 err = ldc_map_sg(port->vio.lp, sg, nsg,
493 desc->cookies, port->ring_cookies,
494 map_perm);
495 if (err < 0) {
496 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
497 return err;
498 }
499
500 rqe = &port->rq_arr[dr->prod];
501 rqe->req = req;
502
503 desc->hdr.ack = VIO_ACK_ENABLE;
504 desc->req_id = port->req_id;
505 desc->operation = op;
506 if (port->vdisk_type == VD_DISK_TYPE_DISK) {
507 desc->slice = 0xff;
508 } else {
509 desc->slice = 0;
510 }
511 desc->status = ~0;
512 desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
513 desc->size = len;
514 desc->ncookies = err;
515
516 /* This has to be a non-SMP write barrier because we are writing
517 * to memory which is shared with the peer LDOM.
518 */
519 wmb();
520 desc->hdr.state = VIO_DESC_READY;
521
522 err = __vdc_tx_trigger(port);
523 if (err < 0) {
524 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
525 } else {
526 port->req_id++;
527 dr->prod = vio_dring_next(dr, dr->prod);
528 }
529
530 return err;
531 }
532
533 static void do_vdc_request(struct request_queue *rq)
534 {
535 struct request *req;
536
537 while ((req = blk_peek_request(rq)) != NULL) {
538 struct vdc_port *port;
539 struct vio_dring_state *dr;
540
541 port = req->rq_disk->private_data;
542 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
543 if (unlikely(vdc_tx_dring_avail(dr) < 1))
544 goto wait;
545
546 blk_start_request(req);
547
548 if (__send_request(req) < 0) {
549 blk_requeue_request(rq, req);
550 wait:
551 /* Avoid pointless unplugs. */
552 blk_stop_queue(rq);
553 break;
554 }
555 }
556 }
557
558 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
559 {
560 struct vio_dring_state *dr;
561 struct vio_completion comp;
562 struct vio_disk_desc *desc;
563 unsigned int map_perm;
564 unsigned long flags;
565 int op_len, err;
566 void *req_buf;
567
568 if (!(((u64)1 << (u64)op) & port->operations))
569 return -EOPNOTSUPP;
570
571 switch (op) {
572 case VD_OP_BREAD:
573 case VD_OP_BWRITE:
574 default:
575 return -EINVAL;
576
577 case VD_OP_FLUSH:
578 op_len = 0;
579 map_perm = 0;
580 break;
581
582 case VD_OP_GET_WCE:
583 op_len = sizeof(u32);
584 map_perm = LDC_MAP_W;
585 break;
586
587 case VD_OP_SET_WCE:
588 op_len = sizeof(u32);
589 map_perm = LDC_MAP_R;
590 break;
591
592 case VD_OP_GET_VTOC:
593 op_len = sizeof(struct vio_disk_vtoc);
594 map_perm = LDC_MAP_W;
595 break;
596
597 case VD_OP_SET_VTOC:
598 op_len = sizeof(struct vio_disk_vtoc);
599 map_perm = LDC_MAP_R;
600 break;
601
602 case VD_OP_GET_DISKGEOM:
603 op_len = sizeof(struct vio_disk_geom);
604 map_perm = LDC_MAP_W;
605 break;
606
607 case VD_OP_SET_DISKGEOM:
608 op_len = sizeof(struct vio_disk_geom);
609 map_perm = LDC_MAP_R;
610 break;
611
612 case VD_OP_SCSICMD:
613 op_len = 16;
614 map_perm = LDC_MAP_RW;
615 break;
616
617 case VD_OP_GET_DEVID:
618 op_len = sizeof(struct vio_disk_devid);
619 map_perm = LDC_MAP_W;
620 break;
621
622 case VD_OP_GET_EFI:
623 case VD_OP_SET_EFI:
624 return -EOPNOTSUPP;
625 break;
626 };
627
628 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
629
630 op_len = (op_len + 7) & ~7;
631 req_buf = kzalloc(op_len, GFP_KERNEL);
632 if (!req_buf)
633 return -ENOMEM;
634
635 if (len > op_len)
636 len = op_len;
637
638 if (map_perm & LDC_MAP_R)
639 memcpy(req_buf, buf, len);
640
641 spin_lock_irqsave(&port->vio.lock, flags);
642
643 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
644
645 /* XXX If we want to use this code generically we have to
646 * XXX handle TX ring exhaustion etc.
647 */
648 desc = vio_dring_cur(dr);
649
650 err = ldc_map_single(port->vio.lp, req_buf, op_len,
651 desc->cookies, port->ring_cookies,
652 map_perm);
653 if (err < 0) {
654 spin_unlock_irqrestore(&port->vio.lock, flags);
655 kfree(req_buf);
656 return err;
657 }
658
659 init_completion(&comp.com);
660 comp.waiting_for = WAITING_FOR_GEN_CMD;
661 port->vio.cmp = &comp;
662
663 desc->hdr.ack = VIO_ACK_ENABLE;
664 desc->req_id = port->req_id;
665 desc->operation = op;
666 desc->slice = 0;
667 desc->status = ~0;
668 desc->offset = 0;
669 desc->size = op_len;
670 desc->ncookies = err;
671
672 /* This has to be a non-SMP write barrier because we are writing
673 * to memory which is shared with the peer LDOM.
674 */
675 wmb();
676 desc->hdr.state = VIO_DESC_READY;
677
678 err = __vdc_tx_trigger(port);
679 if (err >= 0) {
680 port->req_id++;
681 dr->prod = vio_dring_next(dr, dr->prod);
682 spin_unlock_irqrestore(&port->vio.lock, flags);
683
684 wait_for_completion(&comp.com);
685 err = comp.err;
686 } else {
687 port->vio.cmp = NULL;
688 spin_unlock_irqrestore(&port->vio.lock, flags);
689 }
690
691 if (map_perm & LDC_MAP_W)
692 memcpy(buf, req_buf, len);
693
694 kfree(req_buf);
695
696 return err;
697 }
698
699 static int vdc_alloc_tx_ring(struct vdc_port *port)
700 {
701 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
702 unsigned long len, entry_size;
703 int ncookies;
704 void *dring;
705
706 entry_size = sizeof(struct vio_disk_desc) +
707 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
708 len = (VDC_TX_RING_SIZE * entry_size);
709
710 ncookies = VIO_MAX_RING_COOKIES;
711 dring = ldc_alloc_exp_dring(port->vio.lp, len,
712 dr->cookies, &ncookies,
713 (LDC_MAP_SHADOW |
714 LDC_MAP_DIRECT |
715 LDC_MAP_RW));
716 if (IS_ERR(dring))
717 return PTR_ERR(dring);
718
719 dr->base = dring;
720 dr->entry_size = entry_size;
721 dr->num_entries = VDC_TX_RING_SIZE;
722 dr->prod = dr->cons = 0;
723 dr->pending = VDC_TX_RING_SIZE;
724 dr->ncookies = ncookies;
725
726 return 0;
727 }
728
729 static void vdc_free_tx_ring(struct vdc_port *port)
730 {
731 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
732
733 if (dr->base) {
734 ldc_free_exp_dring(port->vio.lp, dr->base,
735 (dr->entry_size * dr->num_entries),
736 dr->cookies, dr->ncookies);
737 dr->base = NULL;
738 dr->entry_size = 0;
739 dr->num_entries = 0;
740 dr->pending = 0;
741 dr->ncookies = 0;
742 }
743 }
744
745 static int vdc_port_up(struct vdc_port *port)
746 {
747 struct vio_completion comp;
748
749 init_completion(&comp.com);
750 comp.err = 0;
751 comp.waiting_for = WAITING_FOR_LINK_UP;
752 port->vio.cmp = &comp;
753
754 vio_port_up(&port->vio);
755 wait_for_completion(&comp.com);
756 return comp.err;
757 }
758
759 static void vdc_port_down(struct vdc_port *port)
760 {
761 ldc_disconnect(port->vio.lp);
762 ldc_unbind(port->vio.lp);
763 vdc_free_tx_ring(port);
764 vio_ldc_free(&port->vio);
765 }
766
767 static int probe_disk(struct vdc_port *port)
768 {
769 struct request_queue *q;
770 struct gendisk *g;
771 int err;
772
773 err = vdc_port_up(port);
774 if (err)
775 return err;
776
777 /* Using version 1.2 means vdisk_phys_blksz should be set unless the
778 * disk is reserved by another system.
779 */
780 if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz)
781 return -ENODEV;
782
783 if (vdc_version_supported(port, 1, 1)) {
784 /* vdisk_size should be set during the handshake, if it wasn't
785 * then the underlying disk is reserved by another system
786 */
787 if (port->vdisk_size == -1)
788 return -ENODEV;
789 } else {
790 struct vio_disk_geom geom;
791
792 err = generic_request(port, VD_OP_GET_DISKGEOM,
793 &geom, sizeof(geom));
794 if (err < 0) {
795 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
796 "error %d\n", err);
797 return err;
798 }
799 port->vdisk_size = ((u64)geom.num_cyl *
800 (u64)geom.num_hd *
801 (u64)geom.num_sec);
802 }
803
804 q = blk_init_queue(do_vdc_request, &port->vio.lock);
805 if (!q) {
806 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
807 port->vio.name);
808 return -ENOMEM;
809 }
810 g = alloc_disk(1 << PARTITION_SHIFT);
811 if (!g) {
812 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
813 port->vio.name);
814 blk_cleanup_queue(q);
815 return -ENOMEM;
816 }
817
818 port->disk = g;
819
820 /* Each segment in a request is up to an aligned page in size. */
821 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
822 blk_queue_max_segment_size(q, PAGE_SIZE);
823
824 blk_queue_max_segments(q, port->ring_cookies);
825 blk_queue_max_hw_sectors(q, port->max_xfer_size);
826 g->major = vdc_major;
827 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
828 strcpy(g->disk_name, port->disk_name);
829
830 g->fops = &vdc_fops;
831 g->queue = q;
832 g->private_data = port;
833
834 set_capacity(g, port->vdisk_size);
835
836 if (vdc_version_supported(port, 1, 1)) {
837 switch (port->vdisk_mtype) {
838 case VD_MEDIA_TYPE_CD:
839 pr_info(PFX "Virtual CDROM %s\n", port->disk_name);
840 g->flags |= GENHD_FL_CD;
841 g->flags |= GENHD_FL_REMOVABLE;
842 set_disk_ro(g, 1);
843 break;
844
845 case VD_MEDIA_TYPE_DVD:
846 pr_info(PFX "Virtual DVD %s\n", port->disk_name);
847 g->flags |= GENHD_FL_CD;
848 g->flags |= GENHD_FL_REMOVABLE;
849 set_disk_ro(g, 1);
850 break;
851
852 case VD_MEDIA_TYPE_FIXED:
853 pr_info(PFX "Virtual Hard disk %s\n", port->disk_name);
854 break;
855 }
856 }
857
858 blk_queue_physical_block_size(q, port->vdisk_phys_blksz);
859
860 pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n",
861 g->disk_name,
862 port->vdisk_size, (port->vdisk_size >> (20 - 9)),
863 port->vio.ver.major, port->vio.ver.minor);
864
865 device_add_disk(&port->vio.vdev->dev, g);
866
867 return 0;
868 }
869
870 static struct ldc_channel_config vdc_ldc_cfg = {
871 .event = vdc_event,
872 .mtu = 64,
873 .mode = LDC_MODE_UNRELIABLE,
874 };
875
876 static struct vio_driver_ops vdc_vio_ops = {
877 .send_attr = vdc_send_attr,
878 .handle_attr = vdc_handle_attr,
879 .handshake_complete = vdc_handshake_complete,
880 };
881
882 static void print_version(void)
883 {
884 static int version_printed;
885
886 if (version_printed++ == 0)
887 printk(KERN_INFO "%s", version);
888 }
889
890 struct vdc_check_port_data {
891 int dev_no;
892 char *type;
893 };
894
895 static int vdc_device_probed(struct device *dev, void *arg)
896 {
897 struct vio_dev *vdev = to_vio_dev(dev);
898 struct vdc_check_port_data *port_data;
899
900 port_data = (struct vdc_check_port_data *)arg;
901
902 if ((vdev->dev_no == port_data->dev_no) &&
903 (!(strcmp((char *)&vdev->type, port_data->type))) &&
904 dev_get_drvdata(dev)) {
905 /* This device has already been configured
906 * by vdc_port_probe()
907 */
908 return 1;
909 } else {
910 return 0;
911 }
912 }
913
914 /* Determine whether the VIO device is part of an mpgroup
915 * by locating all the virtual-device-port nodes associated
916 * with the parent virtual-device node for the VIO device
917 * and checking whether any of these nodes are vdc-ports
918 * which have already been configured.
919 *
920 * Returns true if this device is part of an mpgroup and has
921 * already been probed.
922 */
923 static bool vdc_port_mpgroup_check(struct vio_dev *vdev)
924 {
925 struct vdc_check_port_data port_data;
926 struct device *dev;
927
928 port_data.dev_no = vdev->dev_no;
929 port_data.type = (char *)&vdev->type;
930
931 dev = device_find_child(vdev->dev.parent, &port_data,
932 vdc_device_probed);
933
934 if (dev)
935 return true;
936
937 return false;
938 }
939
940 static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
941 {
942 struct mdesc_handle *hp;
943 struct vdc_port *port;
944 int err;
945 const u64 *ldc_timeout;
946
947 print_version();
948
949 hp = mdesc_grab();
950
951 err = -ENODEV;
952 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
953 printk(KERN_ERR PFX "Port id [%llu] too large.\n",
954 vdev->dev_no);
955 goto err_out_release_mdesc;
956 }
957
958 /* Check if this device is part of an mpgroup */
959 if (vdc_port_mpgroup_check(vdev)) {
960 printk(KERN_WARNING
961 "VIO: Ignoring extra vdisk port %s",
962 dev_name(&vdev->dev));
963 goto err_out_release_mdesc;
964 }
965
966 port = kzalloc(sizeof(*port), GFP_KERNEL);
967 err = -ENOMEM;
968 if (!port) {
969 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
970 goto err_out_release_mdesc;
971 }
972
973 if (vdev->dev_no >= 26)
974 snprintf(port->disk_name, sizeof(port->disk_name),
975 VDCBLK_NAME "%c%c",
976 'a' + ((int)vdev->dev_no / 26) - 1,
977 'a' + ((int)vdev->dev_no % 26));
978 else
979 snprintf(port->disk_name, sizeof(port->disk_name),
980 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
981 port->vdisk_size = -1;
982
983 /* Actual wall time may be double due to do_generic_file_read() doing
984 * a readahead I/O first, and once that fails it will try to read a
985 * single page.
986 */
987 ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL);
988 port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0;
989 timer_setup(&port->ldc_reset_timer, vdc_ldc_reset_timer, 0);
990 INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work);
991
992 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
993 vdc_versions, ARRAY_SIZE(vdc_versions),
994 &vdc_vio_ops, port->disk_name);
995 if (err)
996 goto err_out_free_port;
997
998 port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE;
999 port->max_xfer_size = MAX_XFER_SIZE;
1000 port->ring_cookies = MAX_RING_COOKIES;
1001
1002 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1003 if (err)
1004 goto err_out_free_port;
1005
1006 err = vdc_alloc_tx_ring(port);
1007 if (err)
1008 goto err_out_free_ldc;
1009
1010 err = probe_disk(port);
1011 if (err)
1012 goto err_out_free_tx_ring;
1013
1014 /* Note that the device driver_data is used to determine
1015 * whether the port has been probed.
1016 */
1017 dev_set_drvdata(&vdev->dev, port);
1018
1019 mdesc_release(hp);
1020
1021 return 0;
1022
1023 err_out_free_tx_ring:
1024 vdc_free_tx_ring(port);
1025
1026 err_out_free_ldc:
1027 vio_ldc_free(&port->vio);
1028
1029 err_out_free_port:
1030 kfree(port);
1031
1032 err_out_release_mdesc:
1033 mdesc_release(hp);
1034 return err;
1035 }
1036
1037 static int vdc_port_remove(struct vio_dev *vdev)
1038 {
1039 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
1040
1041 if (port) {
1042 unsigned long flags;
1043
1044 spin_lock_irqsave(&port->vio.lock, flags);
1045 blk_stop_queue(port->disk->queue);
1046 spin_unlock_irqrestore(&port->vio.lock, flags);
1047
1048 flush_work(&port->ldc_reset_work);
1049 del_timer_sync(&port->ldc_reset_timer);
1050 del_timer_sync(&port->vio.timer);
1051
1052 del_gendisk(port->disk);
1053 blk_cleanup_queue(port->disk->queue);
1054 put_disk(port->disk);
1055 port->disk = NULL;
1056
1057 vdc_free_tx_ring(port);
1058 vio_ldc_free(&port->vio);
1059
1060 dev_set_drvdata(&vdev->dev, NULL);
1061
1062 kfree(port);
1063 }
1064 return 0;
1065 }
1066
1067 static void vdc_requeue_inflight(struct vdc_port *port)
1068 {
1069 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1070 u32 idx;
1071
1072 for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) {
1073 struct vio_disk_desc *desc = vio_dring_entry(dr, idx);
1074 struct vdc_req_entry *rqe = &port->rq_arr[idx];
1075 struct request *req;
1076
1077 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
1078 desc->hdr.state = VIO_DESC_FREE;
1079 dr->cons = vio_dring_next(dr, idx);
1080
1081 req = rqe->req;
1082 if (req == NULL) {
1083 vdc_end_special(port, desc);
1084 continue;
1085 }
1086
1087 rqe->req = NULL;
1088 blk_requeue_request(port->disk->queue, req);
1089 }
1090 }
1091
1092 static void vdc_queue_drain(struct vdc_port *port)
1093 {
1094 struct request *req;
1095
1096 while ((req = blk_fetch_request(port->disk->queue)) != NULL)
1097 __blk_end_request_all(req, BLK_STS_IOERR);
1098 }
1099
1100 static void vdc_ldc_reset_timer(struct timer_list *t)
1101 {
1102 struct vdc_port *port = from_timer(port, t, ldc_reset_timer);
1103 struct vio_driver_state *vio = &port->vio;
1104 unsigned long flags;
1105
1106 spin_lock_irqsave(&vio->lock, flags);
1107 if (!(port->vio.hs_state & VIO_HS_COMPLETE)) {
1108 pr_warn(PFX "%s ldc down %llu seconds, draining queue\n",
1109 port->disk_name, port->ldc_timeout);
1110 vdc_queue_drain(port);
1111 vdc_blk_queue_start(port);
1112 }
1113 spin_unlock_irqrestore(&vio->lock, flags);
1114 }
1115
1116 static void vdc_ldc_reset_work(struct work_struct *work)
1117 {
1118 struct vdc_port *port;
1119 struct vio_driver_state *vio;
1120 unsigned long flags;
1121
1122 port = container_of(work, struct vdc_port, ldc_reset_work);
1123 vio = &port->vio;
1124
1125 spin_lock_irqsave(&vio->lock, flags);
1126 vdc_ldc_reset(port);
1127 spin_unlock_irqrestore(&vio->lock, flags);
1128 }
1129
1130 static void vdc_ldc_reset(struct vdc_port *port)
1131 {
1132 int err;
1133
1134 assert_spin_locked(&port->vio.lock);
1135
1136 pr_warn(PFX "%s ldc link reset\n", port->disk_name);
1137 blk_stop_queue(port->disk->queue);
1138 vdc_requeue_inflight(port);
1139 vdc_port_down(port);
1140
1141 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1142 if (err) {
1143 pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err);
1144 return;
1145 }
1146
1147 err = vdc_alloc_tx_ring(port);
1148 if (err) {
1149 pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err);
1150 goto err_free_ldc;
1151 }
1152
1153 if (port->ldc_timeout)
1154 mod_timer(&port->ldc_reset_timer,
1155 round_jiffies(jiffies + HZ * port->ldc_timeout));
1156 mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ));
1157 return;
1158
1159 err_free_ldc:
1160 vio_ldc_free(&port->vio);
1161 }
1162
1163 static const struct vio_device_id vdc_port_match[] = {
1164 {
1165 .type = "vdc-port",
1166 },
1167 {},
1168 };
1169 MODULE_DEVICE_TABLE(vio, vdc_port_match);
1170
1171 static struct vio_driver vdc_port_driver = {
1172 .id_table = vdc_port_match,
1173 .probe = vdc_port_probe,
1174 .remove = vdc_port_remove,
1175 .name = "vdc_port",
1176 };
1177
1178 static int __init vdc_init(void)
1179 {
1180 int err;
1181
1182 sunvdc_wq = alloc_workqueue("sunvdc", 0, 0);
1183 if (!sunvdc_wq)
1184 return -ENOMEM;
1185
1186 err = register_blkdev(0, VDCBLK_NAME);
1187 if (err < 0)
1188 goto out_free_wq;
1189
1190 vdc_major = err;
1191
1192 err = vio_register_driver(&vdc_port_driver);
1193 if (err)
1194 goto out_unregister_blkdev;
1195
1196 return 0;
1197
1198 out_unregister_blkdev:
1199 unregister_blkdev(vdc_major, VDCBLK_NAME);
1200 vdc_major = 0;
1201
1202 out_free_wq:
1203 destroy_workqueue(sunvdc_wq);
1204 return err;
1205 }
1206
1207 static void __exit vdc_exit(void)
1208 {
1209 vio_unregister_driver(&vdc_port_driver);
1210 unregister_blkdev(vdc_major, VDCBLK_NAME);
1211 destroy_workqueue(sunvdc_wq);
1212 }
1213
1214 module_init(vdc_init);
1215 module_exit(vdc_exit);
Linux with added FPC-III support