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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};
175
176static void vdc_blk_queue_start(struct vdc_port *port)
177{
178 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
179
180
181
182
183
184 if (port->disk && vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50)
185 blk_mq_start_stopped_hw_queues(port->disk->queue, true);
186}
187
188static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
189{
190 if (vio->cmp &&
191 (waiting_for == -1 ||
192 vio->cmp->waiting_for == waiting_for)) {
193 vio->cmp->err = err;
194 complete(&vio->cmp->com);
195 vio->cmp = NULL;
196 }
197}
198
199static void vdc_handshake_complete(struct vio_driver_state *vio)
200{
201 struct vdc_port *port = to_vdc_port(vio);
202
203 cancel_delayed_work(&port->ldc_reset_timer_work);
204 vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
205 vdc_blk_queue_start(port);
206}
207
208static int vdc_handle_unknown(struct vdc_port *port, void *arg)
209{
210 struct vio_msg_tag *pkt = arg;
211
212 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
213 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
214 printk(KERN_ERR PFX "Resetting connection.\n");
215
216 ldc_disconnect(port->vio.lp);
217
218 return -ECONNRESET;
219}
220
221static int vdc_send_attr(struct vio_driver_state *vio)
222{
223 struct vdc_port *port = to_vdc_port(vio);
224 struct vio_disk_attr_info pkt;
225
226 memset(&pkt, 0, sizeof(pkt));
227
228 pkt.tag.type = VIO_TYPE_CTRL;
229 pkt.tag.stype = VIO_SUBTYPE_INFO;
230 pkt.tag.stype_env = VIO_ATTR_INFO;
231 pkt.tag.sid = vio_send_sid(vio);
232
233 pkt.xfer_mode = VIO_DRING_MODE;
234 pkt.vdisk_block_size = port->vdisk_block_size;
235 pkt.max_xfer_size = port->max_xfer_size;
236
237 viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
238 pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
239
240 return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
241}
242
243static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
244{
245 struct vdc_port *port = to_vdc_port(vio);
246 struct vio_disk_attr_info *pkt = arg;
247
248 viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] "
249 "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
250 pkt->tag.stype, pkt->operations,
251 pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype,
252 pkt->xfer_mode, pkt->vdisk_block_size,
253 pkt->max_xfer_size);
254
255 if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
256 switch (pkt->vdisk_type) {
257 case VD_DISK_TYPE_DISK:
258 case VD_DISK_TYPE_SLICE:
259 break;
260
261 default:
262 printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
263 vio->name, pkt->vdisk_type);
264 return -ECONNRESET;
265 }
266
267 if (pkt->vdisk_block_size > port->vdisk_block_size) {
268 printk(KERN_ERR PFX "%s: BLOCK size increased "
269 "%u --> %u\n",
270 vio->name,
271 port->vdisk_block_size, pkt->vdisk_block_size);
272 return -ECONNRESET;
273 }
274
275 port->operations = pkt->operations;
276 port->vdisk_type = pkt->vdisk_type;
277 if (vdc_version_supported(port, 1, 1)) {
278 port->vdisk_size = pkt->vdisk_size;
279 port->vdisk_mtype = pkt->vdisk_mtype;
280 }
281 if (pkt->max_xfer_size < port->max_xfer_size)
282 port->max_xfer_size = pkt->max_xfer_size;
283 port->vdisk_block_size = pkt->vdisk_block_size;
284
285 port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE;
286 if (vdc_version_supported(port, 1, 2))
287 port->vdisk_phys_blksz = pkt->phys_block_size;
288
289 return 0;
290 } else {
291 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
292
293 return -ECONNRESET;
294 }
295}
296
297static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
298{
299 int err = desc->status;
300
301 vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
302}
303
304static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
305 unsigned int index)
306{
307 struct vio_disk_desc *desc = vio_dring_entry(dr, index);
308 struct vdc_req_entry *rqe = &port->rq_arr[index];
309 struct request *req;
310
311 if (unlikely(desc->hdr.state != VIO_DESC_DONE))
312 return;
313
314 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
315 desc->hdr.state = VIO_DESC_FREE;
316 dr->cons = vio_dring_next(dr, index);
317
318 req = rqe->req;
319 if (req == NULL) {
320 vdc_end_special(port, desc);
321 return;
322 }
323
324 rqe->req = NULL;
325
326 blk_mq_end_request(req, desc->status ? BLK_STS_IOERR : 0);
327
328 vdc_blk_queue_start(port);
329}
330
331static int vdc_ack(struct vdc_port *port, void *msgbuf)
332{
333 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
334 struct vio_dring_data *pkt = msgbuf;
335
336 if (unlikely(pkt->dring_ident != dr->ident ||
337 pkt->start_idx != pkt->end_idx ||
338 pkt->start_idx >= VDC_TX_RING_SIZE))
339 return 0;
340
341 vdc_end_one(port, dr, pkt->start_idx);
342
343 return 0;
344}
345
346static int vdc_nack(struct vdc_port *port, void *msgbuf)
347{
348
349 return 0;
350}
351
352static void vdc_event(void *arg, int event)
353{
354 struct vdc_port *port = arg;
355 struct vio_driver_state *vio = &port->vio;
356 unsigned long flags;
357 int err;
358
359 spin_lock_irqsave(&vio->lock, flags);
360
361 if (unlikely(event == LDC_EVENT_RESET)) {
362 vio_link_state_change(vio, event);
363 queue_work(sunvdc_wq, &port->ldc_reset_work);
364 goto out;
365 }
366
367 if (unlikely(event == LDC_EVENT_UP)) {
368 vio_link_state_change(vio, event);
369 goto out;
370 }
371
372 if (unlikely(event != LDC_EVENT_DATA_READY)) {
373 pr_warn(PFX "Unexpected LDC event %d\n", event);
374 goto out;
375 }
376
377 err = 0;
378 while (1) {
379 union {
380 struct vio_msg_tag tag;
381 u64 raw[8];
382 } msgbuf;
383
384 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
385 if (unlikely(err < 0)) {
386 if (err == -ECONNRESET)
387 vio_conn_reset(vio);
388 break;
389 }
390 if (err == 0)
391 break;
392 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
393 msgbuf.tag.type,
394 msgbuf.tag.stype,
395 msgbuf.tag.stype_env,
396 msgbuf.tag.sid);
397 err = vio_validate_sid(vio, &msgbuf.tag);
398 if (err < 0)
399 break;
400
401 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
402 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
403 err = vdc_ack(port, &msgbuf);
404 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
405 err = vdc_nack(port, &msgbuf);
406 else
407 err = vdc_handle_unknown(port, &msgbuf);
408 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
409 err = vio_control_pkt_engine(vio, &msgbuf);
410 } else {
411 err = vdc_handle_unknown(port, &msgbuf);
412 }
413 if (err < 0)
414 break;
415 }
416 if (err < 0)
417 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
418out:
419 spin_unlock_irqrestore(&vio->lock, flags);
420}
421
422static int __vdc_tx_trigger(struct vdc_port *port)
423{
424 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
425 struct vio_dring_data hdr = {
426 .tag = {
427 .type = VIO_TYPE_DATA,
428 .stype = VIO_SUBTYPE_INFO,
429 .stype_env = VIO_DRING_DATA,
430 .sid = vio_send_sid(&port->vio),
431 },
432 .dring_ident = dr->ident,
433 .start_idx = dr->prod,
434 .end_idx = dr->prod,
435 };
436 int err, delay;
437 int retries = 0;
438
439 hdr.seq = dr->snd_nxt;
440 delay = 1;
441 do {
442 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
443 if (err > 0) {
444 dr->snd_nxt++;
445 break;
446 }
447 udelay(delay);
448 if ((delay <<= 1) > 128)
449 delay = 128;
450 if (retries++ > VDC_MAX_RETRIES)
451 break;
452 } while (err == -EAGAIN);
453
454 if (err == -ENOTCONN)
455 vdc_ldc_reset(port);
456 return err;
457}
458
459static int __send_request(struct request *req)
460{
461 struct vdc_port *port = req->rq_disk->private_data;
462 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
463 struct scatterlist sg[MAX_RING_COOKIES];
464 struct vdc_req_entry *rqe;
465 struct vio_disk_desc *desc;
466 unsigned int map_perm;
467 int nsg, err, i;
468 u64 len;
469 u8 op;
470
471 if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES))
472 return -EINVAL;
473
474 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
475
476 if (rq_data_dir(req) == READ) {
477 map_perm |= LDC_MAP_W;
478 op = VD_OP_BREAD;
479 } else {
480 map_perm |= LDC_MAP_R;
481 op = VD_OP_BWRITE;
482 }
483
484 sg_init_table(sg, port->ring_cookies);
485 nsg = blk_rq_map_sg(req->q, req, sg);
486
487 len = 0;
488 for (i = 0; i < nsg; i++)
489 len += sg[i].length;
490
491 desc = vio_dring_cur(dr);
492
493 err = ldc_map_sg(port->vio.lp, sg, nsg,
494 desc->cookies, port->ring_cookies,
495 map_perm);
496 if (err < 0) {
497 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
498 return err;
499 }
500
501 rqe = &port->rq_arr[dr->prod];
502 rqe->req = req;
503
504 desc->hdr.ack = VIO_ACK_ENABLE;
505 desc->req_id = port->req_id;
506 desc->operation = op;
507 if (port->vdisk_type == VD_DISK_TYPE_DISK) {
508 desc->slice = 0xff;
509 } else {
510 desc->slice = 0;
511 }
512 desc->status = ~0;
513 desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
514 desc->size = len;
515 desc->ncookies = err;
516
517
518
519
520 wmb();
521 desc->hdr.state = VIO_DESC_READY;
522
523 err = __vdc_tx_trigger(port);
524 if (err < 0) {
525 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
526 } else {
527 port->req_id++;
528 dr->prod = vio_dring_next(dr, dr->prod);
529 }
530
531 return err;
532}
533
534static blk_status_t vdc_queue_rq(struct blk_mq_hw_ctx *hctx,
535 const struct blk_mq_queue_data *bd)
536{
537 struct vdc_port *port = hctx->queue->queuedata;
538 struct vio_dring_state *dr;
539 unsigned long flags;
540
541 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
542
543 blk_mq_start_request(bd->rq);
544
545 spin_lock_irqsave(&port->vio.lock, flags);
546
547
548
549
550 if (unlikely(port->drain)) {
551 spin_unlock_irqrestore(&port->vio.lock, flags);
552 return BLK_STS_IOERR;
553 }
554
555 if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
556 spin_unlock_irqrestore(&port->vio.lock, flags);
557 blk_mq_stop_hw_queue(hctx);
558 return BLK_STS_DEV_RESOURCE;
559 }
560
561 if (__send_request(bd->rq) < 0) {
562 spin_unlock_irqrestore(&port->vio.lock, flags);
563 return BLK_STS_IOERR;
564 }
565
566 spin_unlock_irqrestore(&port->vio.lock, flags);
567 return BLK_STS_OK;
568}
569
570static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
571{
572 struct vio_dring_state *dr;
573 struct vio_completion comp;
574 struct vio_disk_desc *desc;
575 unsigned int map_perm;
576 unsigned long flags;
577 int op_len, err;
578 void *req_buf;
579
580 if (!(((u64)1 << (u64)op) & port->operations))
581 return -EOPNOTSUPP;
582
583 switch (op) {
584 case VD_OP_BREAD:
585 case VD_OP_BWRITE:
586 default:
587 return -EINVAL;
588
589 case VD_OP_FLUSH:
590 op_len = 0;
591 map_perm = 0;
592 break;
593
594 case VD_OP_GET_WCE:
595 op_len = sizeof(u32);
596 map_perm = LDC_MAP_W;
597 break;
598
599 case VD_OP_SET_WCE:
600 op_len = sizeof(u32);
601 map_perm = LDC_MAP_R;
602 break;
603
604 case VD_OP_GET_VTOC:
605 op_len = sizeof(struct vio_disk_vtoc);
606 map_perm = LDC_MAP_W;
607 break;
608
609 case VD_OP_SET_VTOC:
610 op_len = sizeof(struct vio_disk_vtoc);
611 map_perm = LDC_MAP_R;
612 break;
613
614 case VD_OP_GET_DISKGEOM:
615 op_len = sizeof(struct vio_disk_geom);
616 map_perm = LDC_MAP_W;
617 break;
618
619 case VD_OP_SET_DISKGEOM:
620 op_len = sizeof(struct vio_disk_geom);
621 map_perm = LDC_MAP_R;
622 break;
623
624 case VD_OP_SCSICMD:
625 op_len = 16;
626 map_perm = LDC_MAP_RW;
627 break;
628
629 case VD_OP_GET_DEVID:
630 op_len = sizeof(struct vio_disk_devid);
631 map_perm = LDC_MAP_W;
632 break;
633
634 case VD_OP_GET_EFI:
635 case VD_OP_SET_EFI:
636 return -EOPNOTSUPP;
637 };
638
639 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
640
641 op_len = (op_len + 7) & ~7;
642 req_buf = kzalloc(op_len, GFP_KERNEL);
643 if (!req_buf)
644 return -ENOMEM;
645
646 if (len > op_len)
647 len = op_len;
648
649 if (map_perm & LDC_MAP_R)
650 memcpy(req_buf, buf, len);
651
652 spin_lock_irqsave(&port->vio.lock, flags);
653
654 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
655
656
657
658
659 desc = vio_dring_cur(dr);
660
661 err = ldc_map_single(port->vio.lp, req_buf, op_len,
662 desc->cookies, port->ring_cookies,
663 map_perm);
664 if (err < 0) {
665 spin_unlock_irqrestore(&port->vio.lock, flags);
666 kfree(req_buf);
667 return err;
668 }
669
670 init_completion(&comp.com);
671 comp.waiting_for = WAITING_FOR_GEN_CMD;
672 port->vio.cmp = ∁
673
674 desc->hdr.ack = VIO_ACK_ENABLE;
675 desc->req_id = port->req_id;
676 desc->operation = op;
677 desc->slice = 0;
678 desc->status = ~0;
679 desc->offset = 0;
680 desc->size = op_len;
681 desc->ncookies = err;
682
683
684
685
686 wmb();
687 desc->hdr.state = VIO_DESC_READY;
688
689 err = __vdc_tx_trigger(port);
690 if (err >= 0) {
691 port->req_id++;
692 dr->prod = vio_dring_next(dr, dr->prod);
693 spin_unlock_irqrestore(&port->vio.lock, flags);
694
695 wait_for_completion(&comp.com);
696 err = comp.err;
697 } else {
698 port->vio.cmp = NULL;
699 spin_unlock_irqrestore(&port->vio.lock, flags);
700 }
701
702 if (map_perm & LDC_MAP_W)
703 memcpy(buf, req_buf, len);
704
705 kfree(req_buf);
706
707 return err;
708}
709
710static int vdc_alloc_tx_ring(struct vdc_port *port)
711{
712 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
713 unsigned long len, entry_size;
714 int ncookies;
715 void *dring;
716
717 entry_size = sizeof(struct vio_disk_desc) +
718 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
719 len = (VDC_TX_RING_SIZE * entry_size);
720
721 ncookies = VIO_MAX_RING_COOKIES;
722 dring = ldc_alloc_exp_dring(port->vio.lp, len,
723 dr->cookies, &ncookies,
724 (LDC_MAP_SHADOW |
725 LDC_MAP_DIRECT |
726 LDC_MAP_RW));
727 if (IS_ERR(dring))
728 return PTR_ERR(dring);
729
730 dr->base = dring;
731 dr->entry_size = entry_size;
732 dr->num_entries = VDC_TX_RING_SIZE;
733 dr->prod = dr->cons = 0;
734 dr->pending = VDC_TX_RING_SIZE;
735 dr->ncookies = ncookies;
736
737 return 0;
738}
739
740static void vdc_free_tx_ring(struct vdc_port *port)
741{
742 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
743
744 if (dr->base) {
745 ldc_free_exp_dring(port->vio.lp, dr->base,
746 (dr->entry_size * dr->num_entries),
747 dr->cookies, dr->ncookies);
748 dr->base = NULL;
749 dr->entry_size = 0;
750 dr->num_entries = 0;
751 dr->pending = 0;
752 dr->ncookies = 0;
753 }
754}
755
756static int vdc_port_up(struct vdc_port *port)
757{
758 struct vio_completion comp;
759
760 init_completion(&comp.com);
761 comp.err = 0;
762 comp.waiting_for = WAITING_FOR_LINK_UP;
763 port->vio.cmp = ∁
764
765 vio_port_up(&port->vio);
766 wait_for_completion(&comp.com);
767 return comp.err;
768}
769
770static void vdc_port_down(struct vdc_port *port)
771{
772 ldc_disconnect(port->vio.lp);
773 ldc_unbind(port->vio.lp);
774 vdc_free_tx_ring(port);
775 vio_ldc_free(&port->vio);
776}
777
778static const struct blk_mq_ops vdc_mq_ops = {
779 .queue_rq = vdc_queue_rq,
780};
781
782static void cleanup_queue(struct request_queue *q)
783{
784 struct vdc_port *port = q->queuedata;
785
786 blk_cleanup_queue(q);
787 blk_mq_free_tag_set(&port->tag_set);
788}
789
790static struct request_queue *init_queue(struct vdc_port *port)
791{
792 struct request_queue *q;
793
794 q = blk_mq_init_sq_queue(&port->tag_set, &vdc_mq_ops, VDC_TX_RING_SIZE,
795 BLK_MQ_F_SHOULD_MERGE);
796 if (IS_ERR(q))
797 return q;
798
799 q->queuedata = port;
800 return q;
801}
802
803static int probe_disk(struct vdc_port *port)
804{
805 struct request_queue *q;
806 struct gendisk *g;
807 int err;
808
809 err = vdc_port_up(port);
810 if (err)
811 return err;
812
813
814
815
816 if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz)
817 return -ENODEV;
818
819 if (vdc_version_supported(port, 1, 1)) {
820
821
822
823 if (port->vdisk_size == -1)
824 return -ENODEV;
825 } else {
826 struct vio_disk_geom geom;
827
828 err = generic_request(port, VD_OP_GET_DISKGEOM,
829 &geom, sizeof(geom));
830 if (err < 0) {
831 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
832 "error %d\n", err);
833 return err;
834 }
835 port->vdisk_size = ((u64)geom.num_cyl *
836 (u64)geom.num_hd *
837 (u64)geom.num_sec);
838 }
839
840 q = init_queue(port);
841 if (IS_ERR(q)) {
842 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
843 port->vio.name);
844 return PTR_ERR(q);
845 }
846 g = alloc_disk(1 << PARTITION_SHIFT);
847 if (!g) {
848 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
849 port->vio.name);
850 cleanup_queue(q);
851 return -ENOMEM;
852 }
853
854 port->disk = g;
855
856
857 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
858 blk_queue_max_segment_size(q, PAGE_SIZE);
859
860 blk_queue_max_segments(q, port->ring_cookies);
861 blk_queue_max_hw_sectors(q, port->max_xfer_size);
862 g->major = vdc_major;
863 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
864 strcpy(g->disk_name, port->disk_name);
865
866 g->fops = &vdc_fops;
867 g->queue = q;
868 g->private_data = port;
869
870 set_capacity(g, port->vdisk_size);
871
872 if (vdc_version_supported(port, 1, 1)) {
873 switch (port->vdisk_mtype) {
874 case VD_MEDIA_TYPE_CD:
875 pr_info(PFX "Virtual CDROM %s\n", port->disk_name);
876 g->flags |= GENHD_FL_CD;
877 g->flags |= GENHD_FL_REMOVABLE;
878 set_disk_ro(g, 1);
879 break;
880
881 case VD_MEDIA_TYPE_DVD:
882 pr_info(PFX "Virtual DVD %s\n", port->disk_name);
883 g->flags |= GENHD_FL_CD;
884 g->flags |= GENHD_FL_REMOVABLE;
885 set_disk_ro(g, 1);
886 break;
887
888 case VD_MEDIA_TYPE_FIXED:
889 pr_info(PFX "Virtual Hard disk %s\n", port->disk_name);
890 break;
891 }
892 }
893
894 blk_queue_physical_block_size(q, port->vdisk_phys_blksz);
895
896 pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n",
897 g->disk_name,
898 port->vdisk_size, (port->vdisk_size >> (20 - 9)),
899 port->vio.ver.major, port->vio.ver.minor);
900
901 device_add_disk(&port->vio.vdev->dev, g, NULL);
902
903 return 0;
904}
905
906static struct ldc_channel_config vdc_ldc_cfg = {
907 .event = vdc_event,
908 .mtu = 64,
909 .mode = LDC_MODE_UNRELIABLE,
910};
911
912static struct vio_driver_ops vdc_vio_ops = {
913 .send_attr = vdc_send_attr,
914 .handle_attr = vdc_handle_attr,
915 .handshake_complete = vdc_handshake_complete,
916};
917
918static void print_version(void)
919{
920 static int version_printed;
921
922 if (version_printed++ == 0)
923 printk(KERN_INFO "%s", version);
924}
925
926struct vdc_check_port_data {
927 int dev_no;
928 char *type;
929};
930
931static int vdc_device_probed(struct device *dev, void *arg)
932{
933 struct vio_dev *vdev = to_vio_dev(dev);
934 struct vdc_check_port_data *port_data;
935
936 port_data = (struct vdc_check_port_data *)arg;
937
938 if ((vdev->dev_no == port_data->dev_no) &&
939 (!(strcmp((char *)&vdev->type, port_data->type))) &&
940 dev_get_drvdata(dev)) {
941
942
943
944 return 1;
945 } else {
946 return 0;
947 }
948}
949
950
951
952
953
954
955
956
957
958
959static bool vdc_port_mpgroup_check(struct vio_dev *vdev)
960{
961 struct vdc_check_port_data port_data;
962 struct device *dev;
963
964 port_data.dev_no = vdev->dev_no;
965 port_data.type = (char *)&vdev->type;
966
967 dev = device_find_child(vdev->dev.parent, &port_data,
968 vdc_device_probed);
969
970 if (dev)
971 return true;
972
973 return false;
974}
975
976static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
977{
978 struct mdesc_handle *hp;
979 struct vdc_port *port;
980 int err;
981 const u64 *ldc_timeout;
982
983 print_version();
984
985 hp = mdesc_grab();
986
987 err = -ENODEV;
988 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
989 printk(KERN_ERR PFX "Port id [%llu] too large.\n",
990 vdev->dev_no);
991 goto err_out_release_mdesc;
992 }
993
994
995 if (vdc_port_mpgroup_check(vdev)) {
996 printk(KERN_WARNING
997 "VIO: Ignoring extra vdisk port %s",
998 dev_name(&vdev->dev));
999 goto err_out_release_mdesc;
1000 }
1001
1002 port = kzalloc(sizeof(*port), GFP_KERNEL);
1003 err = -ENOMEM;
1004 if (!port) {
1005 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
1006 goto err_out_release_mdesc;
1007 }
1008
1009 if (vdev->dev_no >= 26)
1010 snprintf(port->disk_name, sizeof(port->disk_name),
1011 VDCBLK_NAME "%c%c",
1012 'a' + ((int)vdev->dev_no / 26) - 1,
1013 'a' + ((int)vdev->dev_no % 26));
1014 else
1015 snprintf(port->disk_name, sizeof(port->disk_name),
1016 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
1017 port->vdisk_size = -1;
1018
1019
1020
1021
1022
1023 ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL);
1024 port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0;
1025 INIT_DELAYED_WORK(&port->ldc_reset_timer_work, vdc_ldc_reset_timer_work);
1026 INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work);
1027
1028 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
1029 vdc_versions, ARRAY_SIZE(vdc_versions),
1030 &vdc_vio_ops, port->disk_name);
1031 if (err)
1032 goto err_out_free_port;
1033
1034 port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE;
1035 port->max_xfer_size = MAX_XFER_SIZE;
1036 port->ring_cookies = MAX_RING_COOKIES;
1037
1038 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1039 if (err)
1040 goto err_out_free_port;
1041
1042 err = vdc_alloc_tx_ring(port);
1043 if (err)
1044 goto err_out_free_ldc;
1045
1046 err = probe_disk(port);
1047 if (err)
1048 goto err_out_free_tx_ring;
1049
1050
1051
1052
1053 dev_set_drvdata(&vdev->dev, port);
1054
1055 mdesc_release(hp);
1056
1057 return 0;
1058
1059err_out_free_tx_ring:
1060 vdc_free_tx_ring(port);
1061
1062err_out_free_ldc:
1063 vio_ldc_free(&port->vio);
1064
1065err_out_free_port:
1066 kfree(port);
1067
1068err_out_release_mdesc:
1069 mdesc_release(hp);
1070 return err;
1071}
1072
1073static int vdc_port_remove(struct vio_dev *vdev)
1074{
1075 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
1076
1077 if (port) {
1078 blk_mq_stop_hw_queues(port->disk->queue);
1079
1080 flush_work(&port->ldc_reset_work);
1081 cancel_delayed_work_sync(&port->ldc_reset_timer_work);
1082 del_timer_sync(&port->vio.timer);
1083
1084 del_gendisk(port->disk);
1085 cleanup_queue(port->disk->queue);
1086 put_disk(port->disk);
1087 port->disk = NULL;
1088
1089 vdc_free_tx_ring(port);
1090 vio_ldc_free(&port->vio);
1091
1092 dev_set_drvdata(&vdev->dev, NULL);
1093
1094 kfree(port);
1095 }
1096 return 0;
1097}
1098
1099static void vdc_requeue_inflight(struct vdc_port *port)
1100{
1101 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1102 u32 idx;
1103
1104 for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) {
1105 struct vio_disk_desc *desc = vio_dring_entry(dr, idx);
1106 struct vdc_req_entry *rqe = &port->rq_arr[idx];
1107 struct request *req;
1108
1109 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
1110 desc->hdr.state = VIO_DESC_FREE;
1111 dr->cons = vio_dring_next(dr, idx);
1112
1113 req = rqe->req;
1114 if (req == NULL) {
1115 vdc_end_special(port, desc);
1116 continue;
1117 }
1118
1119 rqe->req = NULL;
1120 blk_mq_requeue_request(req, false);
1121 }
1122}
1123
1124static void vdc_queue_drain(struct vdc_port *port)
1125{
1126 struct request_queue *q = port->disk->queue;
1127
1128
1129
1130
1131
1132 port->drain = 1;
1133 spin_unlock_irq(&port->vio.lock);
1134
1135 blk_mq_freeze_queue(q);
1136 blk_mq_quiesce_queue(q);
1137
1138 spin_lock_irq(&port->vio.lock);
1139 port->drain = 0;
1140 blk_mq_unquiesce_queue(q);
1141 blk_mq_unfreeze_queue(q);
1142}
1143
1144static void vdc_ldc_reset_timer_work(struct work_struct *work)
1145{
1146 struct vdc_port *port;
1147 struct vio_driver_state *vio;
1148
1149 port = container_of(work, struct vdc_port, ldc_reset_timer_work.work);
1150 vio = &port->vio;
1151
1152 spin_lock_irq(&vio->lock);
1153 if (!(port->vio.hs_state & VIO_HS_COMPLETE)) {
1154 pr_warn(PFX "%s ldc down %llu seconds, draining queue\n",
1155 port->disk_name, port->ldc_timeout);
1156 vdc_queue_drain(port);
1157 vdc_blk_queue_start(port);
1158 }
1159 spin_unlock_irq(&vio->lock);
1160}
1161
1162static void vdc_ldc_reset_work(struct work_struct *work)
1163{
1164 struct vdc_port *port;
1165 struct vio_driver_state *vio;
1166 unsigned long flags;
1167
1168 port = container_of(work, struct vdc_port, ldc_reset_work);
1169 vio = &port->vio;
1170
1171 spin_lock_irqsave(&vio->lock, flags);
1172 vdc_ldc_reset(port);
1173 spin_unlock_irqrestore(&vio->lock, flags);
1174}
1175
1176static void vdc_ldc_reset(struct vdc_port *port)
1177{
1178 int err;
1179
1180 assert_spin_locked(&port->vio.lock);
1181
1182 pr_warn(PFX "%s ldc link reset\n", port->disk_name);
1183 blk_mq_stop_hw_queues(port->disk->queue);
1184 vdc_requeue_inflight(port);
1185 vdc_port_down(port);
1186
1187 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1188 if (err) {
1189 pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err);
1190 return;
1191 }
1192
1193 err = vdc_alloc_tx_ring(port);
1194 if (err) {
1195 pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err);
1196 goto err_free_ldc;
1197 }
1198
1199 if (port->ldc_timeout)
1200 mod_delayed_work(system_wq, &port->ldc_reset_timer_work,
1201 round_jiffies(jiffies + HZ * port->ldc_timeout));
1202 mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ));
1203 return;
1204
1205err_free_ldc:
1206 vio_ldc_free(&port->vio);
1207}
1208
1209static const struct vio_device_id vdc_port_match[] = {
1210 {
1211 .type = "vdc-port",
1212 },
1213 {},
1214};
1215MODULE_DEVICE_TABLE(vio, vdc_port_match);
1216
1217static struct vio_driver vdc_port_driver = {
1218 .id_table = vdc_port_match,
1219 .probe = vdc_port_probe,
1220 .remove = vdc_port_remove,
1221 .name = "vdc_port",
1222};
1223
1224static int __init vdc_init(void)
1225{
1226 int err;
1227
1228 sunvdc_wq = alloc_workqueue("sunvdc", 0, 0);
1229 if (!sunvdc_wq)
1230 return -ENOMEM;
1231
1232 err = register_blkdev(0, VDCBLK_NAME);
1233 if (err < 0)
1234 goto out_free_wq;
1235
1236 vdc_major = err;
1237
1238 err = vio_register_driver(&vdc_port_driver);
1239 if (err)
1240 goto out_unregister_blkdev;
1241
1242 return 0;
1243
1244out_unregister_blkdev:
1245 unregister_blkdev(vdc_major, VDCBLK_NAME);
1246 vdc_major = 0;
1247
1248out_free_wq:
1249 destroy_workqueue(sunvdc_wq);
1250 return err;
1251}
1252
1253static void __exit vdc_exit(void)
1254{
1255 vio_unregister_driver(&vdc_port_driver);
1256 unregister_blkdev(vdc_major, VDCBLK_NAME);
1257 destroy_workqueue(sunvdc_wq);
1258}
1259
1260module_init(vdc_init);
1261module_exit(vdc_exit);
1262
