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7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/types.h>
10#include <linux/blk-mq.h>
11#include <linux/hdreg.h>
12#include <linux/genhd.h>
13#include <linux/cdrom.h>
14#include <linux/slab.h>
15#include <linux/spinlock.h>
16#include <linux/completion.h>
17#include <linux/delay.h>
18#include <linux/init.h>
19#include <linux/list.h>
20#include <linux/scatterlist.h>
21
22#include <asm/vio.h>
23#include <asm/ldc.h>
24
25#define DRV_MODULE_NAME "sunvdc"
26#define PFX DRV_MODULE_NAME ": "
27#define DRV_MODULE_VERSION "1.2"
28#define DRV_MODULE_RELDATE "November 24, 2014"
29
30static char version[] =
31 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
32MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
33MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
34MODULE_LICENSE("GPL");
35MODULE_VERSION(DRV_MODULE_VERSION);
36
37#define VDC_TX_RING_SIZE 512
38#define VDC_DEFAULT_BLK_SIZE 512
39
40#define MAX_XFER_BLKS (128 * 1024)
41#define MAX_XFER_SIZE (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE)
42#define MAX_RING_COOKIES ((MAX_XFER_BLKS / PAGE_SIZE) + 2)
43
44#define WAITING_FOR_LINK_UP 0x01
45#define WAITING_FOR_TX_SPACE 0x02
46#define WAITING_FOR_GEN_CMD 0x04
47#define WAITING_FOR_ANY -1
48
49#define VDC_MAX_RETRIES 10
50
51static struct workqueue_struct *sunvdc_wq;
52
53struct vdc_req_entry {
54 struct request *req;
55};
56
57struct vdc_port {
58 struct vio_driver_state vio;
59
60 struct gendisk *disk;
61
62 struct vdc_completion *cmp;
63
64 u64 req_id;
65 u64 seq;
66 struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE];
67
68 unsigned long ring_cookies;
69
70 u64 max_xfer_size;
71 u32 vdisk_block_size;
72 u32 drain;
73
74 u64 ldc_timeout;
75 struct delayed_work ldc_reset_timer_work;
76 struct work_struct ldc_reset_work;
77
78
79
80
81 u64 operations;
82 u32 vdisk_size;
83 u8 vdisk_type;
84 u8 vdisk_mtype;
85 u32 vdisk_phys_blksz;
86
87 struct blk_mq_tag_set tag_set;
88
89 char disk_name[32];
90};
91
92static void vdc_ldc_reset(struct vdc_port *port);
93static void vdc_ldc_reset_work(struct work_struct *work);
94static void vdc_ldc_reset_timer_work(struct work_struct *work);
95
96static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
97{
98 return container_of(vio, struct vdc_port, vio);
99}
100
101
102static struct vio_version vdc_versions[] = {
103 { .major = 1, .minor = 2 },
104 { .major = 1, .minor = 1 },
105 { .major = 1, .minor = 0 },
106};
107
108static inline int vdc_version_supported(struct vdc_port *port,
109 u16 major, u16 minor)
110{
111 return port->vio.ver.major == major && port->vio.ver.minor >= minor;
112}
113
114#define VDCBLK_NAME "vdisk"
115static int vdc_major;
116#define PARTITION_SHIFT 3
117
118static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
119{
120 return vio_dring_avail(dr, VDC_TX_RING_SIZE);
121}
122
123static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
124{
125 struct gendisk *disk = bdev->bd_disk;
126 sector_t nsect = get_capacity(disk);
127 sector_t cylinders = nsect;
128
129 geo->heads = 0xff;
130 geo->sectors = 0x3f;
131 sector_div(cylinders, geo->heads * geo->sectors);
132 geo->cylinders = cylinders;
133 if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect)
134 geo->cylinders = 0xffff;
135
136 return 0;
137}
138
139
140
141
142
143static int vdc_ioctl(struct block_device *bdev, fmode_t mode,
144 unsigned command, unsigned long argument)
145{
146 int i;
147 struct gendisk *disk;
148
149 switch (command) {
150 case CDROMMULTISESSION:
151 pr_debug(PFX "Multisession CDs not supported\n");
152 for (i = 0; i < sizeof(struct cdrom_multisession); i++)
153 if (put_user(0, (char __user *)(argument + i)))
154 return -EFAULT;
155 return 0;
156
157 case CDROM_GET_CAPABILITY:
158 disk = bdev->bd_disk;
159
160 if (bdev->bd_disk && (disk->flags & GENHD_FL_CD))
161 return 0;
162 return -EINVAL;
163
164 default:
165 pr_debug(PFX "ioctl %08x not supported\n", command);
166 return -EINVAL;
167 }
168}
169
170static const struct block_device_operations vdc_fops = {
171 .owner = THIS_MODULE,
172 .getgeo = vdc_getgeo,
173 .ioctl = vdc_ioctl,
174 .compat_ioctl = blkdev_compat_ptr_ioctl,
175};
176
177static void vdc_blk_queue_start(struct vdc_port *port)
178{
179 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
180
181
182
183
184
185 if (port->disk && vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50)
186 blk_mq_start_stopped_hw_queues(port->disk->queue, true);
187}
188
189static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
190{
191 if (vio->cmp &&
192 (waiting_for == -1 ||
193 vio->cmp->waiting_for == waiting_for)) {
194 vio->cmp->err = err;
195 complete(&vio->cmp->com);
196 vio->cmp = NULL;
197 }
198}
199
200static void vdc_handshake_complete(struct vio_driver_state *vio)
201{
202 struct vdc_port *port = to_vdc_port(vio);
203
204 cancel_delayed_work(&port->ldc_reset_timer_work);
205 vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
206 vdc_blk_queue_start(port);
207}
208
209static int vdc_handle_unknown(struct vdc_port *port, void *arg)
210{
211 struct vio_msg_tag *pkt = arg;
212
213 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
214 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
215 printk(KERN_ERR PFX "Resetting connection.\n");
216
217 ldc_disconnect(port->vio.lp);
218
219 return -ECONNRESET;
220}
221
222static int vdc_send_attr(struct vio_driver_state *vio)
223{
224 struct vdc_port *port = to_vdc_port(vio);
225 struct vio_disk_attr_info pkt;
226
227 memset(&pkt, 0, sizeof(pkt));
228
229 pkt.tag.type = VIO_TYPE_CTRL;
230 pkt.tag.stype = VIO_SUBTYPE_INFO;
231 pkt.tag.stype_env = VIO_ATTR_INFO;
232 pkt.tag.sid = vio_send_sid(vio);
233
234 pkt.xfer_mode = VIO_DRING_MODE;
235 pkt.vdisk_block_size = port->vdisk_block_size;
236 pkt.max_xfer_size = port->max_xfer_size;
237
238 viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
239 pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
240
241 return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
242}
243
244static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
245{
246 struct vdc_port *port = to_vdc_port(vio);
247 struct vio_disk_attr_info *pkt = arg;
248
249 viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] "
250 "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
251 pkt->tag.stype, pkt->operations,
252 pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype,
253 pkt->xfer_mode, pkt->vdisk_block_size,
254 pkt->max_xfer_size);
255
256 if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
257 switch (pkt->vdisk_type) {
258 case VD_DISK_TYPE_DISK:
259 case VD_DISK_TYPE_SLICE:
260 break;
261
262 default:
263 printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
264 vio->name, pkt->vdisk_type);
265 return -ECONNRESET;
266 }
267
268 if (pkt->vdisk_block_size > port->vdisk_block_size) {
269 printk(KERN_ERR PFX "%s: BLOCK size increased "
270 "%u --> %u\n",
271 vio->name,
272 port->vdisk_block_size, pkt->vdisk_block_size);
273 return -ECONNRESET;
274 }
275
276 port->operations = pkt->operations;
277 port->vdisk_type = pkt->vdisk_type;
278 if (vdc_version_supported(port, 1, 1)) {
279 port->vdisk_size = pkt->vdisk_size;
280 port->vdisk_mtype = pkt->vdisk_mtype;
281 }
282 if (pkt->max_xfer_size < port->max_xfer_size)
283 port->max_xfer_size = pkt->max_xfer_size;
284 port->vdisk_block_size = pkt->vdisk_block_size;
285
286 port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE;
287 if (vdc_version_supported(port, 1, 2))
288 port->vdisk_phys_blksz = pkt->phys_block_size;
289
290 return 0;
291 } else {
292 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
293
294 return -ECONNRESET;
295 }
296}
297
298static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
299{
300 int err = desc->status;
301
302 vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
303}
304
305static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
306 unsigned int index)
307{
308 struct vio_disk_desc *desc = vio_dring_entry(dr, index);
309 struct vdc_req_entry *rqe = &port->rq_arr[index];
310 struct request *req;
311
312 if (unlikely(desc->hdr.state != VIO_DESC_DONE))
313 return;
314
315 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
316 desc->hdr.state = VIO_DESC_FREE;
317 dr->cons = vio_dring_next(dr, index);
318
319 req = rqe->req;
320 if (req == NULL) {
321 vdc_end_special(port, desc);
322 return;
323 }
324
325 rqe->req = NULL;
326
327 blk_mq_end_request(req, desc->status ? BLK_STS_IOERR : 0);
328
329 vdc_blk_queue_start(port);
330}
331
332static int vdc_ack(struct vdc_port *port, void *msgbuf)
333{
334 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
335 struct vio_dring_data *pkt = msgbuf;
336
337 if (unlikely(pkt->dring_ident != dr->ident ||
338 pkt->start_idx != pkt->end_idx ||
339 pkt->start_idx >= VDC_TX_RING_SIZE))
340 return 0;
341
342 vdc_end_one(port, dr, pkt->start_idx);
343
344 return 0;
345}
346
347static int vdc_nack(struct vdc_port *port, void *msgbuf)
348{
349
350 return 0;
351}
352
353static void vdc_event(void *arg, int event)
354{
355 struct vdc_port *port = arg;
356 struct vio_driver_state *vio = &port->vio;
357 unsigned long flags;
358 int err;
359
360 spin_lock_irqsave(&vio->lock, flags);
361
362 if (unlikely(event == LDC_EVENT_RESET)) {
363 vio_link_state_change(vio, event);
364 queue_work(sunvdc_wq, &port->ldc_reset_work);
365 goto out;
366 }
367
368 if (unlikely(event == LDC_EVENT_UP)) {
369 vio_link_state_change(vio, event);
370 goto out;
371 }
372
373 if (unlikely(event != LDC_EVENT_DATA_READY)) {
374 pr_warn(PFX "Unexpected LDC event %d\n", event);
375 goto out;
376 }
377
378 err = 0;
379 while (1) {
380 union {
381 struct vio_msg_tag tag;
382 u64 raw[8];
383 } msgbuf;
384
385 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
386 if (unlikely(err < 0)) {
387 if (err == -ECONNRESET)
388 vio_conn_reset(vio);
389 break;
390 }
391 if (err == 0)
392 break;
393 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
394 msgbuf.tag.type,
395 msgbuf.tag.stype,
396 msgbuf.tag.stype_env,
397 msgbuf.tag.sid);
398 err = vio_validate_sid(vio, &msgbuf.tag);
399 if (err < 0)
400 break;
401
402 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
403 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
404 err = vdc_ack(port, &msgbuf);
405 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
406 err = vdc_nack(port, &msgbuf);
407 else
408 err = vdc_handle_unknown(port, &msgbuf);
409 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
410 err = vio_control_pkt_engine(vio, &msgbuf);
411 } else {
412 err = vdc_handle_unknown(port, &msgbuf);
413 }
414 if (err < 0)
415 break;
416 }
417 if (err < 0)
418 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
419out:
420 spin_unlock_irqrestore(&vio->lock, flags);
421}
422
423static int __vdc_tx_trigger(struct vdc_port *port)
424{
425 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
426 struct vio_dring_data hdr = {
427 .tag = {
428 .type = VIO_TYPE_DATA,
429 .stype = VIO_SUBTYPE_INFO,
430 .stype_env = VIO_DRING_DATA,
431 .sid = vio_send_sid(&port->vio),
432 },
433 .dring_ident = dr->ident,
434 .start_idx = dr->prod,
435 .end_idx = dr->prod,
436 };
437 int err, delay;
438 int retries = 0;
439
440 hdr.seq = dr->snd_nxt;
441 delay = 1;
442 do {
443 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
444 if (err > 0) {
445 dr->snd_nxt++;
446 break;
447 }
448 udelay(delay);
449 if ((delay <<= 1) > 128)
450 delay = 128;
451 if (retries++ > VDC_MAX_RETRIES)
452 break;
453 } while (err == -EAGAIN);
454
455 if (err == -ENOTCONN)
456 vdc_ldc_reset(port);
457 return err;
458}
459
460static int __send_request(struct request *req)
461{
462 struct vdc_port *port = req->rq_disk->private_data;
463 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
464 struct scatterlist sg[MAX_RING_COOKIES];
465 struct vdc_req_entry *rqe;
466 struct vio_disk_desc *desc;
467 unsigned int map_perm;
468 int nsg, err, i;
469 u64 len;
470 u8 op;
471
472 if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES))
473 return -EINVAL;
474
475 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
476
477 if (rq_data_dir(req) == READ) {
478 map_perm |= LDC_MAP_W;
479 op = VD_OP_BREAD;
480 } else {
481 map_perm |= LDC_MAP_R;
482 op = VD_OP_BWRITE;
483 }
484
485 sg_init_table(sg, port->ring_cookies);
486 nsg = blk_rq_map_sg(req->q, req, sg);
487
488 len = 0;
489 for (i = 0; i < nsg; i++)
490 len += sg[i].length;
491
492 desc = vio_dring_cur(dr);
493
494 err = ldc_map_sg(port->vio.lp, sg, nsg,
495 desc->cookies, port->ring_cookies,
496 map_perm);
497 if (err < 0) {
498 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
499 return err;
500 }
501
502 rqe = &port->rq_arr[dr->prod];
503 rqe->req = req;
504
505 desc->hdr.ack = VIO_ACK_ENABLE;
506 desc->req_id = port->req_id;
507 desc->operation = op;
508 if (port->vdisk_type == VD_DISK_TYPE_DISK) {
509 desc->slice = 0xff;
510 } else {
511 desc->slice = 0;
512 }
513 desc->status = ~0;
514 desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
515 desc->size = len;
516 desc->ncookies = err;
517
518
519
520
521 wmb();
522 desc->hdr.state = VIO_DESC_READY;
523
524 err = __vdc_tx_trigger(port);
525 if (err < 0) {
526 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
527 } else {
528 port->req_id++;
529 dr->prod = vio_dring_next(dr, dr->prod);
530 }
531
532 return err;
533}
534
535static blk_status_t vdc_queue_rq(struct blk_mq_hw_ctx *hctx,
536 const struct blk_mq_queue_data *bd)
537{
538 struct vdc_port *port = hctx->queue->queuedata;
539 struct vio_dring_state *dr;
540 unsigned long flags;
541
542 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
543
544 blk_mq_start_request(bd->rq);
545
546 spin_lock_irqsave(&port->vio.lock, flags);
547
548
549
550
551 if (unlikely(port->drain)) {
552 spin_unlock_irqrestore(&port->vio.lock, flags);
553 return BLK_STS_IOERR;
554 }
555
556 if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
557 spin_unlock_irqrestore(&port->vio.lock, flags);
558 blk_mq_stop_hw_queue(hctx);
559 return BLK_STS_DEV_RESOURCE;
560 }
561
562 if (__send_request(bd->rq) < 0) {
563 spin_unlock_irqrestore(&port->vio.lock, flags);
564 return BLK_STS_IOERR;
565 }
566
567 spin_unlock_irqrestore(&port->vio.lock, flags);
568 return BLK_STS_OK;
569}
570
571static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
572{
573 struct vio_dring_state *dr;
574 struct vio_completion comp;
575 struct vio_disk_desc *desc;
576 unsigned int map_perm;
577 unsigned long flags;
578 int op_len, err;
579 void *req_buf;
580
581 if (!(((u64)1 << (u64)op) & port->operations))
582 return -EOPNOTSUPP;
583
584 switch (op) {
585 case VD_OP_BREAD:
586 case VD_OP_BWRITE:
587 default:
588 return -EINVAL;
589
590 case VD_OP_FLUSH:
591 op_len = 0;
592 map_perm = 0;
593 break;
594
595 case VD_OP_GET_WCE:
596 op_len = sizeof(u32);
597 map_perm = LDC_MAP_W;
598 break;
599
600 case VD_OP_SET_WCE:
601 op_len = sizeof(u32);
602 map_perm = LDC_MAP_R;
603 break;
604
605 case VD_OP_GET_VTOC:
606 op_len = sizeof(struct vio_disk_vtoc);
607 map_perm = LDC_MAP_W;
608 break;
609
610 case VD_OP_SET_VTOC:
611 op_len = sizeof(struct vio_disk_vtoc);
612 map_perm = LDC_MAP_R;
613 break;
614
615 case VD_OP_GET_DISKGEOM:
616 op_len = sizeof(struct vio_disk_geom);
617 map_perm = LDC_MAP_W;
618 break;
619
620 case VD_OP_SET_DISKGEOM:
621 op_len = sizeof(struct vio_disk_geom);
622 map_perm = LDC_MAP_R;
623 break;
624
625 case VD_OP_SCSICMD:
626 op_len = 16;
627 map_perm = LDC_MAP_RW;
628 break;
629
630 case VD_OP_GET_DEVID:
631 op_len = sizeof(struct vio_disk_devid);
632 map_perm = LDC_MAP_W;
633 break;
634
635 case VD_OP_GET_EFI:
636 case VD_OP_SET_EFI:
637 return -EOPNOTSUPP;
638 }
639
640 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
641
642 op_len = (op_len + 7) & ~7;
643 req_buf = kzalloc(op_len, GFP_KERNEL);
644 if (!req_buf)
645 return -ENOMEM;
646
647 if (len > op_len)
648 len = op_len;
649
650 if (map_perm & LDC_MAP_R)
651 memcpy(req_buf, buf, len);
652
653 spin_lock_irqsave(&port->vio.lock, flags);
654
655 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
656
657
658
659
660 desc = vio_dring_cur(dr);
661
662 err = ldc_map_single(port->vio.lp, req_buf, op_len,
663 desc->cookies, port->ring_cookies,
664 map_perm);
665 if (err < 0) {
666 spin_unlock_irqrestore(&port->vio.lock, flags);
667 kfree(req_buf);
668 return err;
669 }
670
671 init_completion(&comp.com);
672 comp.waiting_for = WAITING_FOR_GEN_CMD;
673 port->vio.cmp = ∁
674
675 desc->hdr.ack = VIO_ACK_ENABLE;
676 desc->req_id = port->req_id;
677 desc->operation = op;
678 desc->slice = 0;
679 desc->status = ~0;
680 desc->offset = 0;
681 desc->size = op_len;
682 desc->ncookies = err;
683
684
685
686
687 wmb();
688 desc->hdr.state = VIO_DESC_READY;
689
690 err = __vdc_tx_trigger(port);
691 if (err >= 0) {
692 port->req_id++;
693 dr->prod = vio_dring_next(dr, dr->prod);
694 spin_unlock_irqrestore(&port->vio.lock, flags);
695
696 wait_for_completion(&comp.com);
697 err = comp.err;
698 } else {
699 port->vio.cmp = NULL;
700 spin_unlock_irqrestore(&port->vio.lock, flags);
701 }
702
703 if (map_perm & LDC_MAP_W)
704 memcpy(buf, req_buf, len);
705
706 kfree(req_buf);
707
708 return err;
709}
710
711static int vdc_alloc_tx_ring(struct vdc_port *port)
712{
713 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
714 unsigned long len, entry_size;
715 int ncookies;
716 void *dring;
717
718 entry_size = sizeof(struct vio_disk_desc) +
719 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
720 len = (VDC_TX_RING_SIZE * entry_size);
721
722 ncookies = VIO_MAX_RING_COOKIES;
723 dring = ldc_alloc_exp_dring(port->vio.lp, len,
724 dr->cookies, &ncookies,
725 (LDC_MAP_SHADOW |
726 LDC_MAP_DIRECT |
727 LDC_MAP_RW));
728 if (IS_ERR(dring))
729 return PTR_ERR(dring);
730
731 dr->base = dring;
732 dr->entry_size = entry_size;
733 dr->num_entries = VDC_TX_RING_SIZE;
734 dr->prod = dr->cons = 0;
735 dr->pending = VDC_TX_RING_SIZE;
736 dr->ncookies = ncookies;
737
738 return 0;
739}
740
741static void vdc_free_tx_ring(struct vdc_port *port)
742{
743 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
744
745 if (dr->base) {
746 ldc_free_exp_dring(port->vio.lp, dr->base,
747 (dr->entry_size * dr->num_entries),
748 dr->cookies, dr->ncookies);
749 dr->base = NULL;
750 dr->entry_size = 0;
751 dr->num_entries = 0;
752 dr->pending = 0;
753 dr->ncookies = 0;
754 }
755}
756
757static int vdc_port_up(struct vdc_port *port)
758{
759 struct vio_completion comp;
760
761 init_completion(&comp.com);
762 comp.err = 0;
763 comp.waiting_for = WAITING_FOR_LINK_UP;
764 port->vio.cmp = ∁
765
766 vio_port_up(&port->vio);
767 wait_for_completion(&comp.com);
768 return comp.err;
769}
770
771static void vdc_port_down(struct vdc_port *port)
772{
773 ldc_disconnect(port->vio.lp);
774 ldc_unbind(port->vio.lp);
775 vdc_free_tx_ring(port);
776 vio_ldc_free(&port->vio);
777}
778
779static const struct blk_mq_ops vdc_mq_ops = {
780 .queue_rq = vdc_queue_rq,
781};
782
783static int probe_disk(struct vdc_port *port)
784{
785 struct request_queue *q;
786 struct gendisk *g;
787 int err;
788
789 err = vdc_port_up(port);
790 if (err)
791 return err;
792
793
794
795
796 if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz)
797 return -ENODEV;
798
799 if (vdc_version_supported(port, 1, 1)) {
800
801
802
803 if (port->vdisk_size == -1)
804 return -ENODEV;
805 } else {
806 struct vio_disk_geom geom;
807
808 err = generic_request(port, VD_OP_GET_DISKGEOM,
809 &geom, sizeof(geom));
810 if (err < 0) {
811 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
812 "error %d\n", err);
813 return err;
814 }
815 port->vdisk_size = ((u64)geom.num_cyl *
816 (u64)geom.num_hd *
817 (u64)geom.num_sec);
818 }
819
820 err = blk_mq_alloc_sq_tag_set(&port->tag_set, &vdc_mq_ops,
821 VDC_TX_RING_SIZE, BLK_MQ_F_SHOULD_MERGE);
822 if (err)
823 return err;
824
825 g = blk_mq_alloc_disk(&port->tag_set, port);
826 if (IS_ERR(g)) {
827 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
828 port->vio.name);
829 blk_mq_free_tag_set(&port->tag_set);
830 return PTR_ERR(g);
831 }
832
833 port->disk = g;
834 q = g->queue;
835
836
837 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
838 blk_queue_max_segment_size(q, PAGE_SIZE);
839
840 blk_queue_max_segments(q, port->ring_cookies);
841 blk_queue_max_hw_sectors(q, port->max_xfer_size);
842 g->major = vdc_major;
843 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
844 g->minors = 1 << PARTITION_SHIFT;
845 strcpy(g->disk_name, port->disk_name);
846
847 g->fops = &vdc_fops;
848 g->queue = q;
849 g->private_data = port;
850
851 set_capacity(g, port->vdisk_size);
852
853 if (vdc_version_supported(port, 1, 1)) {
854 switch (port->vdisk_mtype) {
855 case VD_MEDIA_TYPE_CD:
856 pr_info(PFX "Virtual CDROM %s\n", port->disk_name);
857 g->flags |= GENHD_FL_CD;
858 g->flags |= GENHD_FL_REMOVABLE;
859 set_disk_ro(g, 1);
860 break;
861
862 case VD_MEDIA_TYPE_DVD:
863 pr_info(PFX "Virtual DVD %s\n", port->disk_name);
864 g->flags |= GENHD_FL_CD;
865 g->flags |= GENHD_FL_REMOVABLE;
866 set_disk_ro(g, 1);
867 break;
868
869 case VD_MEDIA_TYPE_FIXED:
870 pr_info(PFX "Virtual Hard disk %s\n", port->disk_name);
871 break;
872 }
873 }
874
875 blk_queue_physical_block_size(q, port->vdisk_phys_blksz);
876
877 pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n",
878 g->disk_name,
879 port->vdisk_size, (port->vdisk_size >> (20 - 9)),
880 port->vio.ver.major, port->vio.ver.minor);
881
882 device_add_disk(&port->vio.vdev->dev, g, NULL);
883
884 return 0;
885}
886
887static struct ldc_channel_config vdc_ldc_cfg = {
888 .event = vdc_event,
889 .mtu = 64,
890 .mode = LDC_MODE_UNRELIABLE,
891};
892
893static struct vio_driver_ops vdc_vio_ops = {
894 .send_attr = vdc_send_attr,
895 .handle_attr = vdc_handle_attr,
896 .handshake_complete = vdc_handshake_complete,
897};
898
899static void print_version(void)
900{
901 static int version_printed;
902
903 if (version_printed++ == 0)
904 printk(KERN_INFO "%s", version);
905}
906
907struct vdc_check_port_data {
908 int dev_no;
909 char *type;
910};
911
912static int vdc_device_probed(struct device *dev, void *arg)
913{
914 struct vio_dev *vdev = to_vio_dev(dev);
915 struct vdc_check_port_data *port_data;
916
917 port_data = (struct vdc_check_port_data *)arg;
918
919 if ((vdev->dev_no == port_data->dev_no) &&
920 (!(strcmp((char *)&vdev->type, port_data->type))) &&
921 dev_get_drvdata(dev)) {
922
923
924
925 return 1;
926 } else {
927 return 0;
928 }
929}
930
931
932
933
934
935
936
937
938
939
940static bool vdc_port_mpgroup_check(struct vio_dev *vdev)
941{
942 struct vdc_check_port_data port_data;
943 struct device *dev;
944
945 port_data.dev_no = vdev->dev_no;
946 port_data.type = (char *)&vdev->type;
947
948 dev = device_find_child(vdev->dev.parent, &port_data,
949 vdc_device_probed);
950
951 if (dev)
952 return true;
953
954 return false;
955}
956
957static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
958{
959 struct mdesc_handle *hp;
960 struct vdc_port *port;
961 int err;
962 const u64 *ldc_timeout;
963
964 print_version();
965
966 hp = mdesc_grab();
967
968 err = -ENODEV;
969 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
970 printk(KERN_ERR PFX "Port id [%llu] too large.\n",
971 vdev->dev_no);
972 goto err_out_release_mdesc;
973 }
974
975
976 if (vdc_port_mpgroup_check(vdev)) {
977 printk(KERN_WARNING
978 "VIO: Ignoring extra vdisk port %s",
979 dev_name(&vdev->dev));
980 goto err_out_release_mdesc;
981 }
982
983 port = kzalloc(sizeof(*port), GFP_KERNEL);
984 if (!port) {
985 err = -ENOMEM;
986 goto err_out_release_mdesc;
987 }
988
989 if (vdev->dev_no >= 26)
990 snprintf(port->disk_name, sizeof(port->disk_name),
991 VDCBLK_NAME "%c%c",
992 'a' + ((int)vdev->dev_no / 26) - 1,
993 'a' + ((int)vdev->dev_no % 26));
994 else
995 snprintf(port->disk_name, sizeof(port->disk_name),
996 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
997 port->vdisk_size = -1;
998
999
1000
1001
1002
1003 ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL);
1004 port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0;
1005 INIT_DELAYED_WORK(&port->ldc_reset_timer_work, vdc_ldc_reset_timer_work);
1006 INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work);
1007
1008 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
1009 vdc_versions, ARRAY_SIZE(vdc_versions),
1010 &vdc_vio_ops, port->disk_name);
1011 if (err)
1012 goto err_out_free_port;
1013
1014 port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE;
1015 port->max_xfer_size = MAX_XFER_SIZE;
1016 port->ring_cookies = MAX_RING_COOKIES;
1017
1018 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1019 if (err)
1020 goto err_out_free_port;
1021
1022 err = vdc_alloc_tx_ring(port);
1023 if (err)
1024 goto err_out_free_ldc;
1025
1026 err = probe_disk(port);
1027 if (err)
1028 goto err_out_free_tx_ring;
1029
1030
1031
1032
1033 dev_set_drvdata(&vdev->dev, port);
1034
1035 mdesc_release(hp);
1036
1037 return 0;
1038
1039err_out_free_tx_ring:
1040 vdc_free_tx_ring(port);
1041
1042err_out_free_ldc:
1043 vio_ldc_free(&port->vio);
1044
1045err_out_free_port:
1046 kfree(port);
1047
1048err_out_release_mdesc:
1049 mdesc_release(hp);
1050 return err;
1051}
1052
1053static void vdc_port_remove(struct vio_dev *vdev)
1054{
1055 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
1056
1057 if (port) {
1058 blk_mq_stop_hw_queues(port->disk->queue);
1059
1060 flush_work(&port->ldc_reset_work);
1061 cancel_delayed_work_sync(&port->ldc_reset_timer_work);
1062 del_timer_sync(&port->vio.timer);
1063
1064 del_gendisk(port->disk);
1065 blk_cleanup_disk(port->disk);
1066 blk_mq_free_tag_set(&port->tag_set);
1067
1068 vdc_free_tx_ring(port);
1069 vio_ldc_free(&port->vio);
1070
1071 dev_set_drvdata(&vdev->dev, NULL);
1072
1073 kfree(port);
1074 }
1075}
1076
1077static void vdc_requeue_inflight(struct vdc_port *port)
1078{
1079 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1080 u32 idx;
1081
1082 for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) {
1083 struct vio_disk_desc *desc = vio_dring_entry(dr, idx);
1084 struct vdc_req_entry *rqe = &port->rq_arr[idx];
1085 struct request *req;
1086
1087 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
1088 desc->hdr.state = VIO_DESC_FREE;
1089 dr->cons = vio_dring_next(dr, idx);
1090
1091 req = rqe->req;
1092 if (req == NULL) {
1093 vdc_end_special(port, desc);
1094 continue;
1095 }
1096
1097 rqe->req = NULL;
1098 blk_mq_requeue_request(req, false);
1099 }
1100}
1101
1102static void vdc_queue_drain(struct vdc_port *port)
1103{
1104 struct request_queue *q = port->disk->queue;
1105
1106
1107
1108
1109
1110 port->drain = 1;
1111 spin_unlock_irq(&port->vio.lock);
1112
1113 blk_mq_freeze_queue(q);
1114 blk_mq_quiesce_queue(q);
1115
1116 spin_lock_irq(&port->vio.lock);
1117 port->drain = 0;
1118 blk_mq_unquiesce_queue(q);
1119 blk_mq_unfreeze_queue(q);
1120}
1121
1122static void vdc_ldc_reset_timer_work(struct work_struct *work)
1123{
1124 struct vdc_port *port;
1125 struct vio_driver_state *vio;
1126
1127 port = container_of(work, struct vdc_port, ldc_reset_timer_work.work);
1128 vio = &port->vio;
1129
1130 spin_lock_irq(&vio->lock);
1131 if (!(port->vio.hs_state & VIO_HS_COMPLETE)) {
1132 pr_warn(PFX "%s ldc down %llu seconds, draining queue\n",
1133 port->disk_name, port->ldc_timeout);
1134 vdc_queue_drain(port);
1135 vdc_blk_queue_start(port);
1136 }
1137 spin_unlock_irq(&vio->lock);
1138}
1139
1140static void vdc_ldc_reset_work(struct work_struct *work)
1141{
1142 struct vdc_port *port;
1143 struct vio_driver_state *vio;
1144 unsigned long flags;
1145
1146 port = container_of(work, struct vdc_port, ldc_reset_work);
1147 vio = &port->vio;
1148
1149 spin_lock_irqsave(&vio->lock, flags);
1150 vdc_ldc_reset(port);
1151 spin_unlock_irqrestore(&vio->lock, flags);
1152}
1153
1154static void vdc_ldc_reset(struct vdc_port *port)
1155{
1156 int err;
1157
1158 assert_spin_locked(&port->vio.lock);
1159
1160 pr_warn(PFX "%s ldc link reset\n", port->disk_name);
1161 blk_mq_stop_hw_queues(port->disk->queue);
1162 vdc_requeue_inflight(port);
1163 vdc_port_down(port);
1164
1165 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1166 if (err) {
1167 pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err);
1168 return;
1169 }
1170
1171 err = vdc_alloc_tx_ring(port);
1172 if (err) {
1173 pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err);
1174 goto err_free_ldc;
1175 }
1176
1177 if (port->ldc_timeout)
1178 mod_delayed_work(system_wq, &port->ldc_reset_timer_work,
1179 round_jiffies(jiffies + HZ * port->ldc_timeout));
1180 mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ));
1181 return;
1182
1183err_free_ldc:
1184 vio_ldc_free(&port->vio);
1185}
1186
1187static const struct vio_device_id vdc_port_match[] = {
1188 {
1189 .type = "vdc-port",
1190 },
1191 {},
1192};
1193MODULE_DEVICE_TABLE(vio, vdc_port_match);
1194
1195static struct vio_driver vdc_port_driver = {
1196 .id_table = vdc_port_match,
1197 .probe = vdc_port_probe,
1198 .remove = vdc_port_remove,
1199 .name = "vdc_port",
1200};
1201
1202static int __init vdc_init(void)
1203{
1204 int err;
1205
1206 sunvdc_wq = alloc_workqueue("sunvdc", 0, 0);
1207 if (!sunvdc_wq)
1208 return -ENOMEM;
1209
1210 err = register_blkdev(0, VDCBLK_NAME);
1211 if (err < 0)
1212 goto out_free_wq;
1213
1214 vdc_major = err;
1215
1216 err = vio_register_driver(&vdc_port_driver);
1217 if (err)
1218 goto out_unregister_blkdev;
1219
1220 return 0;
1221
1222out_unregister_blkdev:
1223 unregister_blkdev(vdc_major, VDCBLK_NAME);
1224 vdc_major = 0;
1225
1226out_free_wq:
1227 destroy_workqueue(sunvdc_wq);
1228 return err;
1229}
1230
1231static void __exit vdc_exit(void)
1232{
1233 vio_unregister_driver(&vdc_port_driver);
1234 unregister_blkdev(vdc_major, VDCBLK_NAME);
1235 destroy_workqueue(sunvdc_wq);
1236}
1237
1238module_init(vdc_init);
1239module_exit(vdc_exit);
1240
