esp8089: fix ESP8089 wifi can not work when use CONFIG_WIFI_LOAD_DRIVER_WHEN_KERNEL_BOOT
[firefly-linux-kernel-4.4.55.git] / drivers / block / sunvdc.c
1 /* sunvdc.c: Sun LDOM Virtual Disk Client.
2  *
3  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4  */
5
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/blkdev.h>
10 #include <linux/hdreg.h>
11 #include <linux/genhd.h>
12 #include <linux/cdrom.h>
13 #include <linux/slab.h>
14 #include <linux/spinlock.h>
15 #include <linux/completion.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/scatterlist.h>
20
21 #include <asm/vio.h>
22 #include <asm/ldc.h>
23
24 #define DRV_MODULE_NAME         "sunvdc"
25 #define PFX DRV_MODULE_NAME     ": "
26 #define DRV_MODULE_VERSION      "1.1"
27 #define DRV_MODULE_RELDATE      "February 13, 2013"
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
38 #define WAITING_FOR_LINK_UP     0x01
39 #define WAITING_FOR_TX_SPACE    0x02
40 #define WAITING_FOR_GEN_CMD     0x04
41 #define WAITING_FOR_ANY         -1
42
43 struct vdc_req_entry {
44         struct request          *req;
45 };
46
47 struct vdc_port {
48         struct vio_driver_state vio;
49
50         struct gendisk          *disk;
51
52         struct vdc_completion   *cmp;
53
54         u64                     req_id;
55         u64                     seq;
56         struct vdc_req_entry    rq_arr[VDC_TX_RING_SIZE];
57
58         unsigned long           ring_cookies;
59
60         u64                     max_xfer_size;
61         u32                     vdisk_block_size;
62
63         /* The server fills these in for us in the disk attribute
64          * ACK packet.
65          */
66         u64                     operations;
67         u32                     vdisk_size;
68         u8                      vdisk_type;
69         u8                      vdisk_mtype;
70
71         char                    disk_name[32];
72 };
73
74 static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
75 {
76         return container_of(vio, struct vdc_port, vio);
77 }
78
79 /* Ordered from largest major to lowest */
80 static struct vio_version vdc_versions[] = {
81         { .major = 1, .minor = 1 },
82         { .major = 1, .minor = 0 },
83 };
84
85 static inline int vdc_version_supported(struct vdc_port *port,
86                                         u16 major, u16 minor)
87 {
88         return port->vio.ver.major == major && port->vio.ver.minor >= minor;
89 }
90
91 #define VDCBLK_NAME     "vdisk"
92 static int vdc_major;
93 #define PARTITION_SHIFT 3
94
95 static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
96 {
97         return vio_dring_avail(dr, VDC_TX_RING_SIZE);
98 }
99
100 static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
101 {
102         struct gendisk *disk = bdev->bd_disk;
103         sector_t nsect = get_capacity(disk);
104         sector_t cylinders = nsect;
105
106         geo->heads = 0xff;
107         geo->sectors = 0x3f;
108         sector_div(cylinders, geo->heads * geo->sectors);
109         geo->cylinders = cylinders;
110         if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect)
111                 geo->cylinders = 0xffff;
112
113         return 0;
114 }
115
116 /* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev
117  * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD.
118  * Needed to be able to install inside an ldom from an iso image.
119  */
120 static int vdc_ioctl(struct block_device *bdev, fmode_t mode,
121                      unsigned command, unsigned long argument)
122 {
123         int i;
124         struct gendisk *disk;
125
126         switch (command) {
127         case CDROMMULTISESSION:
128                 pr_debug(PFX "Multisession CDs not supported\n");
129                 for (i = 0; i < sizeof(struct cdrom_multisession); i++)
130                         if (put_user(0, (char __user *)(argument + i)))
131                                 return -EFAULT;
132                 return 0;
133
134         case CDROM_GET_CAPABILITY:
135                 disk = bdev->bd_disk;
136
137                 if (bdev->bd_disk && (disk->flags & GENHD_FL_CD))
138                         return 0;
139                 return -EINVAL;
140
141         default:
142                 pr_debug(PFX "ioctl %08x not supported\n", command);
143                 return -EINVAL;
144         }
145 }
146
147 static const struct block_device_operations vdc_fops = {
148         .owner          = THIS_MODULE,
149         .getgeo         = vdc_getgeo,
150         .ioctl          = vdc_ioctl,
151 };
152
153 static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
154 {
155         if (vio->cmp &&
156             (waiting_for == -1 ||
157              vio->cmp->waiting_for == waiting_for)) {
158                 vio->cmp->err = err;
159                 complete(&vio->cmp->com);
160                 vio->cmp = NULL;
161         }
162 }
163
164 static void vdc_handshake_complete(struct vio_driver_state *vio)
165 {
166         vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
167 }
168
169 static int vdc_handle_unknown(struct vdc_port *port, void *arg)
170 {
171         struct vio_msg_tag *pkt = arg;
172
173         printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
174                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
175         printk(KERN_ERR PFX "Resetting connection.\n");
176
177         ldc_disconnect(port->vio.lp);
178
179         return -ECONNRESET;
180 }
181
182 static int vdc_send_attr(struct vio_driver_state *vio)
183 {
184         struct vdc_port *port = to_vdc_port(vio);
185         struct vio_disk_attr_info pkt;
186
187         memset(&pkt, 0, sizeof(pkt));
188
189         pkt.tag.type = VIO_TYPE_CTRL;
190         pkt.tag.stype = VIO_SUBTYPE_INFO;
191         pkt.tag.stype_env = VIO_ATTR_INFO;
192         pkt.tag.sid = vio_send_sid(vio);
193
194         pkt.xfer_mode = VIO_DRING_MODE;
195         pkt.vdisk_block_size = port->vdisk_block_size;
196         pkt.max_xfer_size = port->max_xfer_size;
197
198         viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
199                pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
200
201         return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
202 }
203
204 static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
205 {
206         struct vdc_port *port = to_vdc_port(vio);
207         struct vio_disk_attr_info *pkt = arg;
208
209         viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] "
210                "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
211                pkt->tag.stype, pkt->operations,
212                pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype,
213                pkt->xfer_mode, pkt->vdisk_block_size,
214                pkt->max_xfer_size);
215
216         if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
217                 switch (pkt->vdisk_type) {
218                 case VD_DISK_TYPE_DISK:
219                 case VD_DISK_TYPE_SLICE:
220                         break;
221
222                 default:
223                         printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
224                                vio->name, pkt->vdisk_type);
225                         return -ECONNRESET;
226                 }
227
228                 if (pkt->vdisk_block_size > port->vdisk_block_size) {
229                         printk(KERN_ERR PFX "%s: BLOCK size increased "
230                                "%u --> %u\n",
231                                vio->name,
232                                port->vdisk_block_size, pkt->vdisk_block_size);
233                         return -ECONNRESET;
234                 }
235
236                 port->operations = pkt->operations;
237                 port->vdisk_type = pkt->vdisk_type;
238                 if (vdc_version_supported(port, 1, 1)) {
239                         port->vdisk_size = pkt->vdisk_size;
240                         port->vdisk_mtype = pkt->vdisk_mtype;
241                 }
242                 if (pkt->max_xfer_size < port->max_xfer_size)
243                         port->max_xfer_size = pkt->max_xfer_size;
244                 port->vdisk_block_size = pkt->vdisk_block_size;
245                 return 0;
246         } else {
247                 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
248
249                 return -ECONNRESET;
250         }
251 }
252
253 static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
254 {
255         int err = desc->status;
256
257         vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
258 }
259
260 static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
261                         unsigned int index)
262 {
263         struct vio_disk_desc *desc = vio_dring_entry(dr, index);
264         struct vdc_req_entry *rqe = &port->rq_arr[index];
265         struct request *req;
266
267         if (unlikely(desc->hdr.state != VIO_DESC_DONE))
268                 return;
269
270         ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
271         desc->hdr.state = VIO_DESC_FREE;
272         dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1);
273
274         req = rqe->req;
275         if (req == NULL) {
276                 vdc_end_special(port, desc);
277                 return;
278         }
279
280         rqe->req = NULL;
281
282         __blk_end_request(req, (desc->status ? -EIO : 0), desc->size);
283
284         /* restart blk queue when ring is half emptied */
285         if (blk_queue_stopped(port->disk->queue) &&
286             vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50)
287                 blk_start_queue(port->disk->queue);
288 }
289
290 static int vdc_ack(struct vdc_port *port, void *msgbuf)
291 {
292         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
293         struct vio_dring_data *pkt = msgbuf;
294
295         if (unlikely(pkt->dring_ident != dr->ident ||
296                      pkt->start_idx != pkt->end_idx ||
297                      pkt->start_idx >= VDC_TX_RING_SIZE))
298                 return 0;
299
300         vdc_end_one(port, dr, pkt->start_idx);
301
302         return 0;
303 }
304
305 static int vdc_nack(struct vdc_port *port, void *msgbuf)
306 {
307         /* XXX Implement me XXX */
308         return 0;
309 }
310
311 static void vdc_event(void *arg, int event)
312 {
313         struct vdc_port *port = arg;
314         struct vio_driver_state *vio = &port->vio;
315         unsigned long flags;
316         int err;
317
318         spin_lock_irqsave(&vio->lock, flags);
319
320         if (unlikely(event == LDC_EVENT_RESET ||
321                      event == LDC_EVENT_UP)) {
322                 vio_link_state_change(vio, event);
323                 spin_unlock_irqrestore(&vio->lock, flags);
324                 return;
325         }
326
327         if (unlikely(event != LDC_EVENT_DATA_READY)) {
328                 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
329                 spin_unlock_irqrestore(&vio->lock, flags);
330                 return;
331         }
332
333         err = 0;
334         while (1) {
335                 union {
336                         struct vio_msg_tag tag;
337                         u64 raw[8];
338                 } msgbuf;
339
340                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
341                 if (unlikely(err < 0)) {
342                         if (err == -ECONNRESET)
343                                 vio_conn_reset(vio);
344                         break;
345                 }
346                 if (err == 0)
347                         break;
348                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
349                        msgbuf.tag.type,
350                        msgbuf.tag.stype,
351                        msgbuf.tag.stype_env,
352                        msgbuf.tag.sid);
353                 err = vio_validate_sid(vio, &msgbuf.tag);
354                 if (err < 0)
355                         break;
356
357                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
358                         if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
359                                 err = vdc_ack(port, &msgbuf);
360                         else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
361                                 err = vdc_nack(port, &msgbuf);
362                         else
363                                 err = vdc_handle_unknown(port, &msgbuf);
364                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
365                         err = vio_control_pkt_engine(vio, &msgbuf);
366                 } else {
367                         err = vdc_handle_unknown(port, &msgbuf);
368                 }
369                 if (err < 0)
370                         break;
371         }
372         if (err < 0)
373                 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
374         spin_unlock_irqrestore(&vio->lock, flags);
375 }
376
377 static int __vdc_tx_trigger(struct vdc_port *port)
378 {
379         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
380         struct vio_dring_data hdr = {
381                 .tag = {
382                         .type           = VIO_TYPE_DATA,
383                         .stype          = VIO_SUBTYPE_INFO,
384                         .stype_env      = VIO_DRING_DATA,
385                         .sid            = vio_send_sid(&port->vio),
386                 },
387                 .dring_ident            = dr->ident,
388                 .start_idx              = dr->prod,
389                 .end_idx                = dr->prod,
390         };
391         int err, delay;
392
393         hdr.seq = dr->snd_nxt;
394         delay = 1;
395         do {
396                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
397                 if (err > 0) {
398                         dr->snd_nxt++;
399                         break;
400                 }
401                 udelay(delay);
402                 if ((delay <<= 1) > 128)
403                         delay = 128;
404         } while (err == -EAGAIN);
405
406         return err;
407 }
408
409 static int __send_request(struct request *req)
410 {
411         struct vdc_port *port = req->rq_disk->private_data;
412         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
413         struct scatterlist sg[port->ring_cookies];
414         struct vdc_req_entry *rqe;
415         struct vio_disk_desc *desc;
416         unsigned int map_perm;
417         int nsg, err, i;
418         u64 len;
419         u8 op;
420
421         map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
422
423         if (rq_data_dir(req) == READ) {
424                 map_perm |= LDC_MAP_W;
425                 op = VD_OP_BREAD;
426         } else {
427                 map_perm |= LDC_MAP_R;
428                 op = VD_OP_BWRITE;
429         }
430
431         sg_init_table(sg, port->ring_cookies);
432         nsg = blk_rq_map_sg(req->q, req, sg);
433
434         len = 0;
435         for (i = 0; i < nsg; i++)
436                 len += sg[i].length;
437
438         desc = vio_dring_cur(dr);
439
440         err = ldc_map_sg(port->vio.lp, sg, nsg,
441                          desc->cookies, port->ring_cookies,
442                          map_perm);
443         if (err < 0) {
444                 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
445                 return err;
446         }
447
448         rqe = &port->rq_arr[dr->prod];
449         rqe->req = req;
450
451         desc->hdr.ack = VIO_ACK_ENABLE;
452         desc->req_id = port->req_id;
453         desc->operation = op;
454         if (port->vdisk_type == VD_DISK_TYPE_DISK) {
455                 desc->slice = 0xff;
456         } else {
457                 desc->slice = 0;
458         }
459         desc->status = ~0;
460         desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
461         desc->size = len;
462         desc->ncookies = err;
463
464         /* This has to be a non-SMP write barrier because we are writing
465          * to memory which is shared with the peer LDOM.
466          */
467         wmb();
468         desc->hdr.state = VIO_DESC_READY;
469
470         err = __vdc_tx_trigger(port);
471         if (err < 0) {
472                 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
473         } else {
474                 port->req_id++;
475                 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
476         }
477
478         return err;
479 }
480
481 static void do_vdc_request(struct request_queue *rq)
482 {
483         struct request *req;
484
485         while ((req = blk_peek_request(rq)) != NULL) {
486                 struct vdc_port *port;
487                 struct vio_dring_state *dr;
488
489                 port = req->rq_disk->private_data;
490                 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
491                 if (unlikely(vdc_tx_dring_avail(dr) < 1))
492                         goto wait;
493
494                 blk_start_request(req);
495
496                 if (__send_request(req) < 0) {
497                         blk_requeue_request(rq, req);
498 wait:
499                         /* Avoid pointless unplugs. */
500                         blk_stop_queue(rq);
501                         break;
502                 }
503         }
504 }
505
506 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
507 {
508         struct vio_dring_state *dr;
509         struct vio_completion comp;
510         struct vio_disk_desc *desc;
511         unsigned int map_perm;
512         unsigned long flags;
513         int op_len, err;
514         void *req_buf;
515
516         if (!(((u64)1 << (u64)op) & port->operations))
517                 return -EOPNOTSUPP;
518
519         switch (op) {
520         case VD_OP_BREAD:
521         case VD_OP_BWRITE:
522         default:
523                 return -EINVAL;
524
525         case VD_OP_FLUSH:
526                 op_len = 0;
527                 map_perm = 0;
528                 break;
529
530         case VD_OP_GET_WCE:
531                 op_len = sizeof(u32);
532                 map_perm = LDC_MAP_W;
533                 break;
534
535         case VD_OP_SET_WCE:
536                 op_len = sizeof(u32);
537                 map_perm = LDC_MAP_R;
538                 break;
539
540         case VD_OP_GET_VTOC:
541                 op_len = sizeof(struct vio_disk_vtoc);
542                 map_perm = LDC_MAP_W;
543                 break;
544
545         case VD_OP_SET_VTOC:
546                 op_len = sizeof(struct vio_disk_vtoc);
547                 map_perm = LDC_MAP_R;
548                 break;
549
550         case VD_OP_GET_DISKGEOM:
551                 op_len = sizeof(struct vio_disk_geom);
552                 map_perm = LDC_MAP_W;
553                 break;
554
555         case VD_OP_SET_DISKGEOM:
556                 op_len = sizeof(struct vio_disk_geom);
557                 map_perm = LDC_MAP_R;
558                 break;
559
560         case VD_OP_SCSICMD:
561                 op_len = 16;
562                 map_perm = LDC_MAP_RW;
563                 break;
564
565         case VD_OP_GET_DEVID:
566                 op_len = sizeof(struct vio_disk_devid);
567                 map_perm = LDC_MAP_W;
568                 break;
569
570         case VD_OP_GET_EFI:
571         case VD_OP_SET_EFI:
572                 return -EOPNOTSUPP;
573                 break;
574         };
575
576         map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
577
578         op_len = (op_len + 7) & ~7;
579         req_buf = kzalloc(op_len, GFP_KERNEL);
580         if (!req_buf)
581                 return -ENOMEM;
582
583         if (len > op_len)
584                 len = op_len;
585
586         if (map_perm & LDC_MAP_R)
587                 memcpy(req_buf, buf, len);
588
589         spin_lock_irqsave(&port->vio.lock, flags);
590
591         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
592
593         /* XXX If we want to use this code generically we have to
594          * XXX handle TX ring exhaustion etc.
595          */
596         desc = vio_dring_cur(dr);
597
598         err = ldc_map_single(port->vio.lp, req_buf, op_len,
599                              desc->cookies, port->ring_cookies,
600                              map_perm);
601         if (err < 0) {
602                 spin_unlock_irqrestore(&port->vio.lock, flags);
603                 kfree(req_buf);
604                 return err;
605         }
606
607         init_completion(&comp.com);
608         comp.waiting_for = WAITING_FOR_GEN_CMD;
609         port->vio.cmp = &comp;
610
611         desc->hdr.ack = VIO_ACK_ENABLE;
612         desc->req_id = port->req_id;
613         desc->operation = op;
614         desc->slice = 0;
615         desc->status = ~0;
616         desc->offset = 0;
617         desc->size = op_len;
618         desc->ncookies = err;
619
620         /* This has to be a non-SMP write barrier because we are writing
621          * to memory which is shared with the peer LDOM.
622          */
623         wmb();
624         desc->hdr.state = VIO_DESC_READY;
625
626         err = __vdc_tx_trigger(port);
627         if (err >= 0) {
628                 port->req_id++;
629                 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
630                 spin_unlock_irqrestore(&port->vio.lock, flags);
631
632                 wait_for_completion(&comp.com);
633                 err = comp.err;
634         } else {
635                 port->vio.cmp = NULL;
636                 spin_unlock_irqrestore(&port->vio.lock, flags);
637         }
638
639         if (map_perm & LDC_MAP_W)
640                 memcpy(buf, req_buf, len);
641
642         kfree(req_buf);
643
644         return err;
645 }
646
647 static int vdc_alloc_tx_ring(struct vdc_port *port)
648 {
649         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
650         unsigned long len, entry_size;
651         int ncookies;
652         void *dring;
653
654         entry_size = sizeof(struct vio_disk_desc) +
655                 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
656         len = (VDC_TX_RING_SIZE * entry_size);
657
658         ncookies = VIO_MAX_RING_COOKIES;
659         dring = ldc_alloc_exp_dring(port->vio.lp, len,
660                                     dr->cookies, &ncookies,
661                                     (LDC_MAP_SHADOW |
662                                      LDC_MAP_DIRECT |
663                                      LDC_MAP_RW));
664         if (IS_ERR(dring))
665                 return PTR_ERR(dring);
666
667         dr->base = dring;
668         dr->entry_size = entry_size;
669         dr->num_entries = VDC_TX_RING_SIZE;
670         dr->prod = dr->cons = 0;
671         dr->pending = VDC_TX_RING_SIZE;
672         dr->ncookies = ncookies;
673
674         return 0;
675 }
676
677 static void vdc_free_tx_ring(struct vdc_port *port)
678 {
679         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
680
681         if (dr->base) {
682                 ldc_free_exp_dring(port->vio.lp, dr->base,
683                                    (dr->entry_size * dr->num_entries),
684                                    dr->cookies, dr->ncookies);
685                 dr->base = NULL;
686                 dr->entry_size = 0;
687                 dr->num_entries = 0;
688                 dr->pending = 0;
689                 dr->ncookies = 0;
690         }
691 }
692
693 static int probe_disk(struct vdc_port *port)
694 {
695         struct vio_completion comp;
696         struct request_queue *q;
697         struct gendisk *g;
698         int err;
699
700         init_completion(&comp.com);
701         comp.err = 0;
702         comp.waiting_for = WAITING_FOR_LINK_UP;
703         port->vio.cmp = &comp;
704
705         vio_port_up(&port->vio);
706
707         wait_for_completion(&comp.com);
708         if (comp.err)
709                 return comp.err;
710
711         if (vdc_version_supported(port, 1, 1)) {
712                 /* vdisk_size should be set during the handshake, if it wasn't
713                  * then the underlying disk is reserved by another system
714                  */
715                 if (port->vdisk_size == -1)
716                         return -ENODEV;
717         } else {
718                 struct vio_disk_geom geom;
719
720                 err = generic_request(port, VD_OP_GET_DISKGEOM,
721                                       &geom, sizeof(geom));
722                 if (err < 0) {
723                         printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
724                                "error %d\n", err);
725                         return err;
726                 }
727                 port->vdisk_size = ((u64)geom.num_cyl *
728                                     (u64)geom.num_hd *
729                                     (u64)geom.num_sec);
730         }
731
732         q = blk_init_queue(do_vdc_request, &port->vio.lock);
733         if (!q) {
734                 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
735                        port->vio.name);
736                 return -ENOMEM;
737         }
738         g = alloc_disk(1 << PARTITION_SHIFT);
739         if (!g) {
740                 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
741                        port->vio.name);
742                 blk_cleanup_queue(q);
743                 return -ENOMEM;
744         }
745
746         port->disk = g;
747
748         /* Each segment in a request is up to an aligned page in size. */
749         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
750         blk_queue_max_segment_size(q, PAGE_SIZE);
751
752         blk_queue_max_segments(q, port->ring_cookies);
753         blk_queue_max_hw_sectors(q, port->max_xfer_size);
754         g->major = vdc_major;
755         g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
756         strcpy(g->disk_name, port->disk_name);
757
758         g->fops = &vdc_fops;
759         g->queue = q;
760         g->private_data = port;
761         g->driverfs_dev = &port->vio.vdev->dev;
762
763         set_capacity(g, port->vdisk_size);
764
765         if (vdc_version_supported(port, 1, 1)) {
766                 switch (port->vdisk_mtype) {
767                 case VD_MEDIA_TYPE_CD:
768                         pr_info(PFX "Virtual CDROM %s\n", port->disk_name);
769                         g->flags |= GENHD_FL_CD;
770                         g->flags |= GENHD_FL_REMOVABLE;
771                         set_disk_ro(g, 1);
772                         break;
773
774                 case VD_MEDIA_TYPE_DVD:
775                         pr_info(PFX "Virtual DVD %s\n", port->disk_name);
776                         g->flags |= GENHD_FL_CD;
777                         g->flags |= GENHD_FL_REMOVABLE;
778                         set_disk_ro(g, 1);
779                         break;
780
781                 case VD_MEDIA_TYPE_FIXED:
782                         pr_info(PFX "Virtual Hard disk %s\n", port->disk_name);
783                         break;
784                 }
785         }
786
787         pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n",
788                g->disk_name,
789                port->vdisk_size, (port->vdisk_size >> (20 - 9)),
790                port->vio.ver.major, port->vio.ver.minor);
791
792         add_disk(g);
793
794         return 0;
795 }
796
797 static struct ldc_channel_config vdc_ldc_cfg = {
798         .event          = vdc_event,
799         .mtu            = 64,
800         .mode           = LDC_MODE_UNRELIABLE,
801 };
802
803 static struct vio_driver_ops vdc_vio_ops = {
804         .send_attr              = vdc_send_attr,
805         .handle_attr            = vdc_handle_attr,
806         .handshake_complete     = vdc_handshake_complete,
807 };
808
809 static void print_version(void)
810 {
811         static int version_printed;
812
813         if (version_printed++ == 0)
814                 printk(KERN_INFO "%s", version);
815 }
816
817 static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
818 {
819         struct mdesc_handle *hp;
820         struct vdc_port *port;
821         int err;
822
823         print_version();
824
825         hp = mdesc_grab();
826
827         err = -ENODEV;
828         if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
829                 printk(KERN_ERR PFX "Port id [%llu] too large.\n",
830                        vdev->dev_no);
831                 goto err_out_release_mdesc;
832         }
833
834         port = kzalloc(sizeof(*port), GFP_KERNEL);
835         err = -ENOMEM;
836         if (!port) {
837                 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
838                 goto err_out_release_mdesc;
839         }
840
841         if (vdev->dev_no >= 26)
842                 snprintf(port->disk_name, sizeof(port->disk_name),
843                          VDCBLK_NAME "%c%c",
844                          'a' + ((int)vdev->dev_no / 26) - 1,
845                          'a' + ((int)vdev->dev_no % 26));
846         else
847                 snprintf(port->disk_name, sizeof(port->disk_name),
848                          VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
849         port->vdisk_size = -1;
850
851         err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
852                               vdc_versions, ARRAY_SIZE(vdc_versions),
853                               &vdc_vio_ops, port->disk_name);
854         if (err)
855                 goto err_out_free_port;
856
857         port->vdisk_block_size = 512;
858         port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
859         port->ring_cookies = ((port->max_xfer_size *
860                                port->vdisk_block_size) / PAGE_SIZE) + 2;
861
862         err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
863         if (err)
864                 goto err_out_free_port;
865
866         err = vdc_alloc_tx_ring(port);
867         if (err)
868                 goto err_out_free_ldc;
869
870         err = probe_disk(port);
871         if (err)
872                 goto err_out_free_tx_ring;
873
874         dev_set_drvdata(&vdev->dev, port);
875
876         mdesc_release(hp);
877
878         return 0;
879
880 err_out_free_tx_ring:
881         vdc_free_tx_ring(port);
882
883 err_out_free_ldc:
884         vio_ldc_free(&port->vio);
885
886 err_out_free_port:
887         kfree(port);
888
889 err_out_release_mdesc:
890         mdesc_release(hp);
891         return err;
892 }
893
894 static int vdc_port_remove(struct vio_dev *vdev)
895 {
896         struct vdc_port *port = dev_get_drvdata(&vdev->dev);
897
898         if (port) {
899                 del_timer_sync(&port->vio.timer);
900
901                 vdc_free_tx_ring(port);
902                 vio_ldc_free(&port->vio);
903
904                 dev_set_drvdata(&vdev->dev, NULL);
905
906                 kfree(port);
907         }
908         return 0;
909 }
910
911 static const struct vio_device_id vdc_port_match[] = {
912         {
913                 .type = "vdc-port",
914         },
915         {},
916 };
917 MODULE_DEVICE_TABLE(vio, vdc_port_match);
918
919 static struct vio_driver vdc_port_driver = {
920         .id_table       = vdc_port_match,
921         .probe          = vdc_port_probe,
922         .remove         = vdc_port_remove,
923         .name           = "vdc_port",
924 };
925
926 static int __init vdc_init(void)
927 {
928         int err;
929
930         err = register_blkdev(0, VDCBLK_NAME);
931         if (err < 0)
932                 goto out_err;
933
934         vdc_major = err;
935
936         err = vio_register_driver(&vdc_port_driver);
937         if (err)
938                 goto out_unregister_blkdev;
939
940         return 0;
941
942 out_unregister_blkdev:
943         unregister_blkdev(vdc_major, VDCBLK_NAME);
944         vdc_major = 0;
945
946 out_err:
947         return err;
948 }
949
950 static void __exit vdc_exit(void)
951 {
952         vio_unregister_driver(&vdc_port_driver);
953         unregister_blkdev(vdc_major, VDCBLK_NAME);
954 }
955
956 module_init(vdc_init);
957 module_exit(vdc_exit);