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Linux 5.1.15
[linux/fpc-iii.git] / drivers / block / sunvdc.c
blob26937ba28f789177545b2c651a3bf738b0c16b43
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/blk-mq.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 u32 drain;
72
73 u64 ldc_timeout;
74 struct delayed_work ldc_reset_timer_work;
75 struct work_struct ldc_reset_work;
76
77 /* The server fills these in for us in the disk attribute
78 * ACK packet.
79 */
80 u64 operations;
81 u32 vdisk_size;
82 u8 vdisk_type;
83 u8 vdisk_mtype;
84 u32 vdisk_phys_blksz;
85
86 struct blk_mq_tag_set tag_set;
87
88 char disk_name[32];
89 };
90
91 static void vdc_ldc_reset(struct vdc_port *port);
92 static void vdc_ldc_reset_work(struct work_struct *work);
93 static void vdc_ldc_reset_timer_work(struct work_struct *work);
94
95 static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
96 {
97 return container_of(vio, struct vdc_port, vio);
98 }
99
100 /* Ordered from largest major to lowest */
101 static struct vio_version vdc_versions[] = {
102 { .major = 1, .minor = 2 },
103 { .major = 1, .minor = 1 },
104 { .major = 1, .minor = 0 },
105 };
106
107 static inline int vdc_version_supported(struct vdc_port *port,
108 u16 major, u16 minor)
109 {
110 return port->vio.ver.major == major && port->vio.ver.minor >= minor;
111 }
112
113 #define VDCBLK_NAME "vdisk"
114 static int vdc_major;
115 #define PARTITION_SHIFT 3
116
117 static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
118 {
119 return vio_dring_avail(dr, VDC_TX_RING_SIZE);
120 }
121
122 static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
123 {
124 struct gendisk *disk = bdev->bd_disk;
125 sector_t nsect = get_capacity(disk);
126 sector_t cylinders = nsect;
127
128 geo->heads = 0xff;
129 geo->sectors = 0x3f;
130 sector_div(cylinders, geo->heads * geo->sectors);
131 geo->cylinders = cylinders;
132 if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect)
133 geo->cylinders = 0xffff;
134
135 return 0;
136 }
137
138 /* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev
139 * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD.
140 * Needed to be able to install inside an ldom from an iso image.
141 */
142 static int vdc_ioctl(struct block_device *bdev, fmode_t mode,
143 unsigned command, unsigned long argument)
144 {
145 int i;
146 struct gendisk *disk;
147
148 switch (command) {
149 case CDROMMULTISESSION:
150 pr_debug(PFX "Multisession CDs not supported\n");
151 for (i = 0; i < sizeof(struct cdrom_multisession); i++)
152 if (put_user(0, (char __user *)(argument + i)))
153 return -EFAULT;
154 return 0;
155
156 case CDROM_GET_CAPABILITY:
157 disk = bdev->bd_disk;
158
159 if (bdev->bd_disk && (disk->flags & GENHD_FL_CD))
160 return 0;
161 return -EINVAL;
162
163 default:
164 pr_debug(PFX "ioctl %08x not supported\n", command);
165 return -EINVAL;
166 }
167 }
168
169 static const struct block_device_operations vdc_fops = {
170 .owner = THIS_MODULE,
171 .getgeo = vdc_getgeo,
172 .ioctl = vdc_ioctl,
173 };
174
175 static void vdc_blk_queue_start(struct vdc_port *port)
176 {
177 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
178
179 /* restart blk queue when ring is half emptied. also called after
180 * handshake completes, so check for initial handshake before we've
181 * allocated a disk.
182 */
183 if (port->disk && vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50)
184 blk_mq_start_stopped_hw_queues(port->disk->queue, true);
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 cancel_delayed_work(&port->ldc_reset_timer_work);
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_mq_end_request(req, desc->status ? BLK_STS_IOERR : 0);
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 blk_status_t vdc_queue_rq(struct blk_mq_hw_ctx *hctx,
534 const struct blk_mq_queue_data *bd)
535 {
536 struct vdc_port *port = hctx->queue->queuedata;
537 struct vio_dring_state *dr;
538 unsigned long flags;
539
540 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
541
542 blk_mq_start_request(bd->rq);
543
544 spin_lock_irqsave(&port->vio.lock, flags);
545
546 /*
547 * Doing drain, just end the request in error
548 */
549 if (unlikely(port->drain)) {
550 spin_unlock_irqrestore(&port->vio.lock, flags);
551 return BLK_STS_IOERR;
552 }
553
554 if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
555 spin_unlock_irqrestore(&port->vio.lock, flags);
556 blk_mq_stop_hw_queue(hctx);
557 return BLK_STS_DEV_RESOURCE;
558 }
559
560 if (__send_request(bd->rq) < 0) {
561 spin_unlock_irqrestore(&port->vio.lock, flags);
562 return BLK_STS_IOERR;
563 }
564
565 spin_unlock_irqrestore(&port->vio.lock, flags);
566 return BLK_STS_OK;
567 }
568
569 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
570 {
571 struct vio_dring_state *dr;
572 struct vio_completion comp;
573 struct vio_disk_desc *desc;
574 unsigned int map_perm;
575 unsigned long flags;
576 int op_len, err;
577 void *req_buf;
578
579 if (!(((u64)1 << (u64)op) & port->operations))
580 return -EOPNOTSUPP;
581
582 switch (op) {
583 case VD_OP_BREAD:
584 case VD_OP_BWRITE:
585 default:
586 return -EINVAL;
587
588 case VD_OP_FLUSH:
589 op_len = 0;
590 map_perm = 0;
591 break;
592
593 case VD_OP_GET_WCE:
594 op_len = sizeof(u32);
595 map_perm = LDC_MAP_W;
596 break;
597
598 case VD_OP_SET_WCE:
599 op_len = sizeof(u32);
600 map_perm = LDC_MAP_R;
601 break;
602
603 case VD_OP_GET_VTOC:
604 op_len = sizeof(struct vio_disk_vtoc);
605 map_perm = LDC_MAP_W;
606 break;
607
608 case VD_OP_SET_VTOC:
609 op_len = sizeof(struct vio_disk_vtoc);
610 map_perm = LDC_MAP_R;
611 break;
612
613 case VD_OP_GET_DISKGEOM:
614 op_len = sizeof(struct vio_disk_geom);
615 map_perm = LDC_MAP_W;
616 break;
617
618 case VD_OP_SET_DISKGEOM:
619 op_len = sizeof(struct vio_disk_geom);
620 map_perm = LDC_MAP_R;
621 break;
622
623 case VD_OP_SCSICMD:
624 op_len = 16;
625 map_perm = LDC_MAP_RW;
626 break;
627
628 case VD_OP_GET_DEVID:
629 op_len = sizeof(struct vio_disk_devid);
630 map_perm = LDC_MAP_W;
631 break;
632
633 case VD_OP_GET_EFI:
634 case VD_OP_SET_EFI:
635 return -EOPNOTSUPP;
636 };
637
638 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
639
640 op_len = (op_len + 7) & ~7;
641 req_buf = kzalloc(op_len, GFP_KERNEL);
642 if (!req_buf)
643 return -ENOMEM;
644
645 if (len > op_len)
646 len = op_len;
647
648 if (map_perm & LDC_MAP_R)
649 memcpy(req_buf, buf, len);
650
651 spin_lock_irqsave(&port->vio.lock, flags);
652
653 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
654
655 /* XXX If we want to use this code generically we have to
656 * XXX handle TX ring exhaustion etc.
657 */
658 desc = vio_dring_cur(dr);
659
660 err = ldc_map_single(port->vio.lp, req_buf, op_len,
661 desc->cookies, port->ring_cookies,
662 map_perm);
663 if (err < 0) {
664 spin_unlock_irqrestore(&port->vio.lock, flags);
665 kfree(req_buf);
666 return err;
667 }
668
669 init_completion(&comp.com);
670 comp.waiting_for = WAITING_FOR_GEN_CMD;
671 port->vio.cmp = &comp;
672
673 desc->hdr.ack = VIO_ACK_ENABLE;
674 desc->req_id = port->req_id;
675 desc->operation = op;
676 desc->slice = 0;
677 desc->status = ~0;
678 desc->offset = 0;
679 desc->size = op_len;
680 desc->ncookies = err;
681
682 /* This has to be a non-SMP write barrier because we are writing
683 * to memory which is shared with the peer LDOM.
684 */
685 wmb();
686 desc->hdr.state = VIO_DESC_READY;
687
688 err = __vdc_tx_trigger(port);
689 if (err >= 0) {
690 port->req_id++;
691 dr->prod = vio_dring_next(dr, dr->prod);
692 spin_unlock_irqrestore(&port->vio.lock, flags);
693
694 wait_for_completion(&comp.com);
695 err = comp.err;
696 } else {
697 port->vio.cmp = NULL;
698 spin_unlock_irqrestore(&port->vio.lock, flags);
699 }
700
701 if (map_perm & LDC_MAP_W)
702 memcpy(buf, req_buf, len);
703
704 kfree(req_buf);
705
706 return err;
707 }
708
709 static int vdc_alloc_tx_ring(struct vdc_port *port)
710 {
711 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
712 unsigned long len, entry_size;
713 int ncookies;
714 void *dring;
715
716 entry_size = sizeof(struct vio_disk_desc) +
717 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
718 len = (VDC_TX_RING_SIZE * entry_size);
719
720 ncookies = VIO_MAX_RING_COOKIES;
721 dring = ldc_alloc_exp_dring(port->vio.lp, len,
722 dr->cookies, &ncookies,
723 (LDC_MAP_SHADOW |
724 LDC_MAP_DIRECT |
725 LDC_MAP_RW));
726 if (IS_ERR(dring))
727 return PTR_ERR(dring);
728
729 dr->base = dring;
730 dr->entry_size = entry_size;
731 dr->num_entries = VDC_TX_RING_SIZE;
732 dr->prod = dr->cons = 0;
733 dr->pending = VDC_TX_RING_SIZE;
734 dr->ncookies = ncookies;
735
736 return 0;
737 }
738
739 static void vdc_free_tx_ring(struct vdc_port *port)
740 {
741 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
742
743 if (dr->base) {
744 ldc_free_exp_dring(port->vio.lp, dr->base,
745 (dr->entry_size * dr->num_entries),
746 dr->cookies, dr->ncookies);
747 dr->base = NULL;
748 dr->entry_size = 0;
749 dr->num_entries = 0;
750 dr->pending = 0;
751 dr->ncookies = 0;
752 }
753 }
754
755 static int vdc_port_up(struct vdc_port *port)
756 {
757 struct vio_completion comp;
758
759 init_completion(&comp.com);
760 comp.err = 0;
761 comp.waiting_for = WAITING_FOR_LINK_UP;
762 port->vio.cmp = &comp;
763
764 vio_port_up(&port->vio);
765 wait_for_completion(&comp.com);
766 return comp.err;
767 }
768
769 static void vdc_port_down(struct vdc_port *port)
770 {
771 ldc_disconnect(port->vio.lp);
772 ldc_unbind(port->vio.lp);
773 vdc_free_tx_ring(port);
774 vio_ldc_free(&port->vio);
775 }
776
777 static const struct blk_mq_ops vdc_mq_ops = {
778 .queue_rq = vdc_queue_rq,
779 };
780
781 static void cleanup_queue(struct request_queue *q)
782 {
783 struct vdc_port *port = q->queuedata;
784
785 blk_cleanup_queue(q);
786 blk_mq_free_tag_set(&port->tag_set);
787 }
788
789 static struct request_queue *init_queue(struct vdc_port *port)
790 {
791 struct request_queue *q;
792
793 q = blk_mq_init_sq_queue(&port->tag_set, &vdc_mq_ops, VDC_TX_RING_SIZE,
794 BLK_MQ_F_SHOULD_MERGE);
795 if (IS_ERR(q))
796 return q;
797
798 q->queuedata = port;
799 return q;
800 }
801
802 static int probe_disk(struct vdc_port *port)
803 {
804 struct request_queue *q;
805 struct gendisk *g;
806 int err;
807
808 err = vdc_port_up(port);
809 if (err)
810 return err;
811
812 /* Using version 1.2 means vdisk_phys_blksz should be set unless the
813 * disk is reserved by another system.
814 */
815 if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz)
816 return -ENODEV;
817
818 if (vdc_version_supported(port, 1, 1)) {
819 /* vdisk_size should be set during the handshake, if it wasn't
820 * then the underlying disk is reserved by another system
821 */
822 if (port->vdisk_size == -1)
823 return -ENODEV;
824 } else {
825 struct vio_disk_geom geom;
826
827 err = generic_request(port, VD_OP_GET_DISKGEOM,
828 &geom, sizeof(geom));
829 if (err < 0) {
830 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
831 "error %d\n", err);
832 return err;
833 }
834 port->vdisk_size = ((u64)geom.num_cyl *
835 (u64)geom.num_hd *
836 (u64)geom.num_sec);
837 }
838
839 q = init_queue(port);
840 if (IS_ERR(q)) {
841 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
842 port->vio.name);
843 return PTR_ERR(q);
844 }
845 g = alloc_disk(1 << PARTITION_SHIFT);
846 if (!g) {
847 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
848 port->vio.name);
849 cleanup_queue(q);
850 return -ENOMEM;
851 }
852
853 port->disk = g;
854
855 /* Each segment in a request is up to an aligned page in size. */
856 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
857 blk_queue_max_segment_size(q, PAGE_SIZE);
858
859 blk_queue_max_segments(q, port->ring_cookies);
860 blk_queue_max_hw_sectors(q, port->max_xfer_size);
861 g->major = vdc_major;
862 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
863 strcpy(g->disk_name, port->disk_name);
864
865 g->fops = &vdc_fops;
866 g->queue = q;
867 g->private_data = port;
868
869 set_capacity(g, port->vdisk_size);
870
871 if (vdc_version_supported(port, 1, 1)) {
872 switch (port->vdisk_mtype) {
873 case VD_MEDIA_TYPE_CD:
874 pr_info(PFX "Virtual CDROM %s\n", port->disk_name);
875 g->flags |= GENHD_FL_CD;
876 g->flags |= GENHD_FL_REMOVABLE;
877 set_disk_ro(g, 1);
878 break;
879
880 case VD_MEDIA_TYPE_DVD:
881 pr_info(PFX "Virtual DVD %s\n", port->disk_name);
882 g->flags |= GENHD_FL_CD;
883 g->flags |= GENHD_FL_REMOVABLE;
884 set_disk_ro(g, 1);
885 break;
886
887 case VD_MEDIA_TYPE_FIXED:
888 pr_info(PFX "Virtual Hard disk %s\n", port->disk_name);
889 break;
890 }
891 }
892
893 blk_queue_physical_block_size(q, port->vdisk_phys_blksz);
894
895 pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n",
896 g->disk_name,
897 port->vdisk_size, (port->vdisk_size >> (20 - 9)),
898 port->vio.ver.major, port->vio.ver.minor);
899
900 device_add_disk(&port->vio.vdev->dev, g, NULL);
901
902 return 0;
903 }
904
905 static struct ldc_channel_config vdc_ldc_cfg = {
906 .event = vdc_event,
907 .mtu = 64,
908 .mode = LDC_MODE_UNRELIABLE,
909 };
910
911 static struct vio_driver_ops vdc_vio_ops = {
912 .send_attr = vdc_send_attr,
913 .handle_attr = vdc_handle_attr,
914 .handshake_complete = vdc_handshake_complete,
915 };
916
917 static void print_version(void)
918 {
919 static int version_printed;
920
921 if (version_printed++ == 0)
922 printk(KERN_INFO "%s", version);
923 }
924
925 struct vdc_check_port_data {
926 int dev_no;
927 char *type;
928 };
929
930 static int vdc_device_probed(struct device *dev, void *arg)
931 {
932 struct vio_dev *vdev = to_vio_dev(dev);
933 struct vdc_check_port_data *port_data;
934
935 port_data = (struct vdc_check_port_data *)arg;
936
937 if ((vdev->dev_no == port_data->dev_no) &&
938 (!(strcmp((char *)&vdev->type, port_data->type))) &&
939 dev_get_drvdata(dev)) {
940 /* This device has already been configured
941 * by vdc_port_probe()
942 */
943 return 1;
944 } else {
945 return 0;
946 }
947 }
948
949 /* Determine whether the VIO device is part of an mpgroup
950 * by locating all the virtual-device-port nodes associated
951 * with the parent virtual-device node for the VIO device
952 * and checking whether any of these nodes are vdc-ports
953 * which have already been configured.
954 *
955 * Returns true if this device is part of an mpgroup and has
956 * already been probed.
957 */
958 static bool vdc_port_mpgroup_check(struct vio_dev *vdev)
959 {
960 struct vdc_check_port_data port_data;
961 struct device *dev;
962
963 port_data.dev_no = vdev->dev_no;
964 port_data.type = (char *)&vdev->type;
965
966 dev = device_find_child(vdev->dev.parent, &port_data,
967 vdc_device_probed);
968
969 if (dev)
970 return true;
971
972 return false;
973 }
974
975 static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
976 {
977 struct mdesc_handle *hp;
978 struct vdc_port *port;
979 int err;
980 const u64 *ldc_timeout;
981
982 print_version();
983
984 hp = mdesc_grab();
985
986 err = -ENODEV;
987 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
988 printk(KERN_ERR PFX "Port id [%llu] too large.\n",
989 vdev->dev_no);
990 goto err_out_release_mdesc;
991 }
992
993 /* Check if this device is part of an mpgroup */
994 if (vdc_port_mpgroup_check(vdev)) {
995 printk(KERN_WARNING
996 "VIO: Ignoring extra vdisk port %s",
997 dev_name(&vdev->dev));
998 goto err_out_release_mdesc;
999 }
1000
1001 port = kzalloc(sizeof(*port), GFP_KERNEL);
1002 err = -ENOMEM;
1003 if (!port) {
1004 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
1005 goto err_out_release_mdesc;
1006 }
1007
1008 if (vdev->dev_no >= 26)
1009 snprintf(port->disk_name, sizeof(port->disk_name),
1010 VDCBLK_NAME "%c%c",
1011 'a' + ((int)vdev->dev_no / 26) - 1,
1012 'a' + ((int)vdev->dev_no % 26));
1013 else
1014 snprintf(port->disk_name, sizeof(port->disk_name),
1015 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
1016 port->vdisk_size = -1;
1017
1018 /* Actual wall time may be double due to do_generic_file_read() doing
1019 * a readahead I/O first, and once that fails it will try to read a
1020 * single page.
1021 */
1022 ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL);
1023 port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0;
1024 INIT_DELAYED_WORK(&port->ldc_reset_timer_work, vdc_ldc_reset_timer_work);
1025 INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work);
1026
1027 err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
1028 vdc_versions, ARRAY_SIZE(vdc_versions),
1029 &vdc_vio_ops, port->disk_name);
1030 if (err)
1031 goto err_out_free_port;
1032
1033 port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE;
1034 port->max_xfer_size = MAX_XFER_SIZE;
1035 port->ring_cookies = MAX_RING_COOKIES;
1036
1037 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1038 if (err)
1039 goto err_out_free_port;
1040
1041 err = vdc_alloc_tx_ring(port);
1042 if (err)
1043 goto err_out_free_ldc;
1044
1045 err = probe_disk(port);
1046 if (err)
1047 goto err_out_free_tx_ring;
1048
1049 /* Note that the device driver_data is used to determine
1050 * whether the port has been probed.
1051 */
1052 dev_set_drvdata(&vdev->dev, port);
1053
1054 mdesc_release(hp);
1055
1056 return 0;
1057
1058 err_out_free_tx_ring:
1059 vdc_free_tx_ring(port);
1060
1061 err_out_free_ldc:
1062 vio_ldc_free(&port->vio);
1063
1064 err_out_free_port:
1065 kfree(port);
1066
1067 err_out_release_mdesc:
1068 mdesc_release(hp);
1069 return err;
1070 }
1071
1072 static int vdc_port_remove(struct vio_dev *vdev)
1073 {
1074 struct vdc_port *port = dev_get_drvdata(&vdev->dev);
1075
1076 if (port) {
1077 blk_mq_stop_hw_queues(port->disk->queue);
1078
1079 flush_work(&port->ldc_reset_work);
1080 cancel_delayed_work_sync(&port->ldc_reset_timer_work);
1081 del_timer_sync(&port->vio.timer);
1082
1083 del_gendisk(port->disk);
1084 cleanup_queue(port->disk->queue);
1085 put_disk(port->disk);
1086 port->disk = NULL;
1087
1088 vdc_free_tx_ring(port);
1089 vio_ldc_free(&port->vio);
1090
1091 dev_set_drvdata(&vdev->dev, NULL);
1092
1093 kfree(port);
1094 }
1095 return 0;
1096 }
1097
1098 static void vdc_requeue_inflight(struct vdc_port *port)
1099 {
1100 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1101 u32 idx;
1102
1103 for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) {
1104 struct vio_disk_desc *desc = vio_dring_entry(dr, idx);
1105 struct vdc_req_entry *rqe = &port->rq_arr[idx];
1106 struct request *req;
1107
1108 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
1109 desc->hdr.state = VIO_DESC_FREE;
1110 dr->cons = vio_dring_next(dr, idx);
1111
1112 req = rqe->req;
1113 if (req == NULL) {
1114 vdc_end_special(port, desc);
1115 continue;
1116 }
1117
1118 rqe->req = NULL;
1119 blk_mq_requeue_request(req, false);
1120 }
1121 }
1122
1123 static void vdc_queue_drain(struct vdc_port *port)
1124 {
1125 struct request_queue *q = port->disk->queue;
1126
1127 /*
1128 * Mark the queue as draining, then freeze/quiesce to ensure
1129 * that all existing requests are seen in ->queue_rq() and killed
1130 */
1131 port->drain = 1;
1132 spin_unlock_irq(&port->vio.lock);
1133
1134 blk_mq_freeze_queue(q);
1135 blk_mq_quiesce_queue(q);
1136
1137 spin_lock_irq(&port->vio.lock);
1138 port->drain = 0;
1139 blk_mq_unquiesce_queue(q);
1140 blk_mq_unfreeze_queue(q);
1141 }
1142
1143 static void vdc_ldc_reset_timer_work(struct work_struct *work)
1144 {
1145 struct vdc_port *port;
1146 struct vio_driver_state *vio;
1147
1148 port = container_of(work, struct vdc_port, ldc_reset_timer_work.work);
1149 vio = &port->vio;
1150
1151 spin_lock_irq(&vio->lock);
1152 if (!(port->vio.hs_state & VIO_HS_COMPLETE)) {
1153 pr_warn(PFX "%s ldc down %llu seconds, draining queue\n",
1154 port->disk_name, port->ldc_timeout);
1155 vdc_queue_drain(port);
1156 vdc_blk_queue_start(port);
1157 }
1158 spin_unlock_irq(&vio->lock);
1159 }
1160
1161 static void vdc_ldc_reset_work(struct work_struct *work)
1162 {
1163 struct vdc_port *port;
1164 struct vio_driver_state *vio;
1165 unsigned long flags;
1166
1167 port = container_of(work, struct vdc_port, ldc_reset_work);
1168 vio = &port->vio;
1169
1170 spin_lock_irqsave(&vio->lock, flags);
1171 vdc_ldc_reset(port);
1172 spin_unlock_irqrestore(&vio->lock, flags);
1173 }
1174
1175 static void vdc_ldc_reset(struct vdc_port *port)
1176 {
1177 int err;
1178
1179 assert_spin_locked(&port->vio.lock);
1180
1181 pr_warn(PFX "%s ldc link reset\n", port->disk_name);
1182 blk_mq_stop_hw_queues(port->disk->queue);
1183 vdc_requeue_inflight(port);
1184 vdc_port_down(port);
1185
1186 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
1187 if (err) {
1188 pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err);
1189 return;
1190 }
1191
1192 err = vdc_alloc_tx_ring(port);
1193 if (err) {
1194 pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err);
1195 goto err_free_ldc;
1196 }
1197
1198 if (port->ldc_timeout)
1199 mod_delayed_work(system_wq, &port->ldc_reset_timer_work,
1200 round_jiffies(jiffies + HZ * port->ldc_timeout));
1201 mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ));
1202 return;
1203
1204 err_free_ldc:
1205 vio_ldc_free(&port->vio);
1206 }
1207
1208 static const struct vio_device_id vdc_port_match[] = {
1209 {
1210 .type = "vdc-port",
1211 },
1212 {},
1213 };
1214 MODULE_DEVICE_TABLE(vio, vdc_port_match);
1215
1216 static struct vio_driver vdc_port_driver = {
1217 .id_table = vdc_port_match,
1218 .probe = vdc_port_probe,
1219 .remove = vdc_port_remove,
1220 .name = "vdc_port",
1221 };
1222
1223 static int __init vdc_init(void)
1224 {
1225 int err;
1226
1227 sunvdc_wq = alloc_workqueue("sunvdc", 0, 0);
1228 if (!sunvdc_wq)
1229 return -ENOMEM;
1230
1231 err = register_blkdev(0, VDCBLK_NAME);
1232 if (err < 0)
1233 goto out_free_wq;
1234
1235 vdc_major = err;
1236
1237 err = vio_register_driver(&vdc_port_driver);
1238 if (err)
1239 goto out_unregister_blkdev;
1240
1241 return 0;
1242
1243 out_unregister_blkdev:
1244 unregister_blkdev(vdc_major, VDCBLK_NAME);
1245 vdc_major = 0;
1246
1247 out_free_wq:
1248 destroy_workqueue(sunvdc_wq);
1249 return err;
1250 }
1251
1252 static void __exit vdc_exit(void)
1253 {
1254 vio_unregister_driver(&vdc_port_driver);
1255 unregister_blkdev(vdc_major, VDCBLK_NAME);
1256 destroy_workqueue(sunvdc_wq);
1257 }
1258
1259 module_init(vdc_init);
1260 module_exit(vdc_exit);
Linux with added FPC-III support