git.oblomov.eu Git - linux-2.6/blob - drivers/block/sunvdc.c

   1 /* sunvdc.c: Sun LDOM Virtual Disk Client.
   2  *
   3  * Copyright (C) 2007 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/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/completion.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/list.h>
  18
  19 #include <asm/vio.h>
  20 #include <asm/ldc.h>
  21
  22 #define DRV_MODULE_NAME         "sunvdc"
  23 #define PFX DRV_MODULE_NAME     ": "
  24 #define DRV_MODULE_VERSION      "1.0"
  25 #define DRV_MODULE_RELDATE      "June 25, 2007"
  26
  27 static char version[] __devinitdata =
  28         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  29 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  30 MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
  31 MODULE_LICENSE("GPL");
  32 MODULE_VERSION(DRV_MODULE_VERSION);
  33
  34 #define VDC_TX_RING_SIZE        256
  35
  36 #define WAITING_FOR_LINK_UP     0x01
  37 #define WAITING_FOR_TX_SPACE    0x02
  38 #define WAITING_FOR_GEN_CMD     0x04
  39 #define WAITING_FOR_ANY         -1
  40
  41 struct vdc_req_entry {
  42         struct request          *req;
  43 };
  44
  45 struct vdc_port {
  46         struct vio_driver_state vio;
  47
  48         struct gendisk          *disk;
  49
  50         struct vdc_completion   *cmp;
  51
  52         u64                     req_id;
  53         u64                     seq;
  54         struct vdc_req_entry    rq_arr[VDC_TX_RING_SIZE];
  55
  56         unsigned long           ring_cookies;
  57
  58         u64                     max_xfer_size;
  59         u32                     vdisk_block_size;
  60
  61         /* The server fills these in for us in the disk attribute
  62          * ACK packet.
  63          */
  64         u64                     operations;
  65         u32                     vdisk_size;
  66         u8                      vdisk_type;
  67         u8                      dev_no;
  68
  69         char                    disk_name[32];
  70
  71         struct vio_disk_geom    geom;
  72         struct vio_disk_vtoc    label;
  73 };
  74
  75 static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
  76 {
  77         return container_of(vio, struct vdc_port, vio);
  78 }
  79
  80 /* Ordered from largest major to lowest */
  81 static struct vio_version vdc_versions[] = {
  82         { .major = 1, .minor = 0 },
  83 };
  84
  85 #define VDCBLK_NAME     "vdisk"
  86 static int vdc_major;
  87 #define PARTITION_SHIFT 3
  88
  89 static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
  90 {
  91         return vio_dring_avail(dr, VDC_TX_RING_SIZE);
  92 }
  93
  94 static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
  95 {
  96         struct gendisk *disk = bdev->bd_disk;
  97         struct vdc_port *port = disk->private_data;
  98
  99         geo->heads = (u8) port->geom.num_hd;
 100         geo->sectors = (u8) port->geom.num_sec;
 101         geo->cylinders = port->geom.num_cyl;
 102
 103         return 0;
 104 }
 105
 106 static struct block_device_operations vdc_fops = {
 107         .owner          = THIS_MODULE,
 108         .getgeo         = vdc_getgeo,
 109 };
 110
 111 static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
 112 {
 113         if (vio->cmp &&
 114             (waiting_for == -1 ||
 115              vio->cmp->waiting_for == waiting_for)) {
 116                 vio->cmp->err = err;
 117                 complete(&vio->cmp->com);
 118                 vio->cmp = NULL;
 119         }
 120 }
 121
 122 static void vdc_handshake_complete(struct vio_driver_state *vio)
 123 {
 124         vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
 125 }
 126
 127 static int vdc_handle_unknown(struct vdc_port *port, void *arg)
 128 {
 129         struct vio_msg_tag *pkt = arg;
 130
 131         printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
 132                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
 133         printk(KERN_ERR PFX "Resetting connection.\n");
 134
 135         ldc_disconnect(port->vio.lp);
 136
 137         return -ECONNRESET;
 138 }
 139
 140 static int vdc_send_attr(struct vio_driver_state *vio)
 141 {
 142         struct vdc_port *port = to_vdc_port(vio);
 143         struct vio_disk_attr_info pkt;
 144
 145         memset(&pkt, 0, sizeof(pkt));
 146
 147         pkt.tag.type = VIO_TYPE_CTRL;
 148         pkt.tag.stype = VIO_SUBTYPE_INFO;
 149         pkt.tag.stype_env = VIO_ATTR_INFO;
 150         pkt.tag.sid = vio_send_sid(vio);
 151
 152         pkt.xfer_mode = VIO_DRING_MODE;
 153         pkt.vdisk_block_size = port->vdisk_block_size;
 154         pkt.max_xfer_size = port->max_xfer_size;
 155
 156         viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n",
 157                pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
 158
 159         return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
 160 }
 161
 162 static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
 163 {
 164         struct vdc_port *port = to_vdc_port(vio);
 165         struct vio_disk_attr_info *pkt = arg;
 166
 167         viodbg(HS, "GOT ATTR stype[0x%x] ops[%lx] disk_size[%lu] disk_type[%x] "
 168                "xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n",
 169                pkt->tag.stype, pkt->operations,
 170                pkt->vdisk_size, pkt->vdisk_type,
 171                pkt->xfer_mode, pkt->vdisk_block_size,
 172                pkt->max_xfer_size);
 173
 174         if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
 175                 switch (pkt->vdisk_type) {
 176                 case VD_DISK_TYPE_DISK:
 177                 case VD_DISK_TYPE_SLICE:
 178                         break;
 179
 180                 default:
 181                         printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
 182                                vio->name, pkt->vdisk_type);
 183                         return -ECONNRESET;
 184                 }
 185
 186                 if (pkt->vdisk_block_size > port->vdisk_block_size) {
 187                         printk(KERN_ERR PFX "%s: BLOCK size increased "
 188                                "%u --> %u\n",
 189                                vio->name,
 190                                port->vdisk_block_size, pkt->vdisk_block_size);
 191                         return -ECONNRESET;
 192                 }
 193
 194                 port->operations = pkt->operations;
 195                 port->vdisk_size = pkt->vdisk_size;
 196                 port->vdisk_type = pkt->vdisk_type;
 197                 if (pkt->max_xfer_size < port->max_xfer_size)
 198                         port->max_xfer_size = pkt->max_xfer_size;
 199                 port->vdisk_block_size = pkt->vdisk_block_size;
 200                 return 0;
 201         } else {
 202                 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
 203
 204                 return -ECONNRESET;
 205         }
 206 }
 207
 208 static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
 209 {
 210         int err = desc->status;
 211
 212         vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
 213 }
 214
 215 static void vdc_end_request(struct request *req, int uptodate, int num_sectors)
 216 {
 217         if (end_that_request_first(req, uptodate, num_sectors))
 218                 return;
 219         add_disk_randomness(req->rq_disk);
 220         end_that_request_last(req, uptodate);
 221 }
 222
 223 static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
 224                         unsigned int index)
 225 {
 226         struct vio_disk_desc *desc = vio_dring_entry(dr, index);
 227         struct vdc_req_entry *rqe = &port->rq_arr[index];
 228         struct request *req;
 229
 230         if (unlikely(desc->hdr.state != VIO_DESC_DONE))
 231                 return;
 232
 233         ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
 234         desc->hdr.state = VIO_DESC_FREE;
 235         dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1);
 236
 237         req = rqe->req;
 238         if (req == NULL) {
 239                 vdc_end_special(port, desc);
 240                 return;
 241         }
 242
 243         rqe->req = NULL;
 244
 245         vdc_end_request(req, !desc->status, desc->size >> 9);
 246
 247         if (blk_queue_stopped(port->disk->queue))
 248                 blk_start_queue(port->disk->queue);
 249 }
 250
 251 static int vdc_ack(struct vdc_port *port, void *msgbuf)
 252 {
 253         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 254         struct vio_dring_data *pkt = msgbuf;
 255
 256         if (unlikely(pkt->dring_ident != dr->ident ||
 257                      pkt->start_idx != pkt->end_idx ||
 258                      pkt->start_idx >= VDC_TX_RING_SIZE))
 259                 return 0;
 260
 261         vdc_end_one(port, dr, pkt->start_idx);
 262
 263         return 0;
 264 }
 265
 266 static int vdc_nack(struct vdc_port *port, void *msgbuf)
 267 {
 268         /* XXX Implement me XXX */
 269         return 0;
 270 }
 271
 272 static void vdc_event(void *arg, int event)
 273 {
 274         struct vdc_port *port = arg;
 275         struct vio_driver_state *vio = &port->vio;
 276         unsigned long flags;
 277         int err;
 278
 279         spin_lock_irqsave(&vio->lock, flags);
 280
 281         if (unlikely(event == LDC_EVENT_RESET ||
 282                      event == LDC_EVENT_UP)) {
 283                 vio_link_state_change(vio, event);
 284                 spin_unlock_irqrestore(&vio->lock, flags);
 285                 return;
 286         }
 287
 288         if (unlikely(event != LDC_EVENT_DATA_READY)) {
 289                 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
 290                 spin_unlock_irqrestore(&vio->lock, flags);
 291                 return;
 292         }
 293
 294         err = 0;
 295         while (1) {
 296                 union {
 297                         struct vio_msg_tag tag;
 298                         u64 raw[8];
 299                 } msgbuf;
 300
 301                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
 302                 if (unlikely(err < 0)) {
 303                         if (err == -ECONNRESET)
 304                                 vio_conn_reset(vio);
 305                         break;
 306                 }
 307                 if (err == 0)
 308                         break;
 309                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
 310                        msgbuf.tag.type,
 311                        msgbuf.tag.stype,
 312                        msgbuf.tag.stype_env,
 313                        msgbuf.tag.sid);
 314                 err = vio_validate_sid(vio, &msgbuf.tag);
 315                 if (err < 0)
 316                         break;
 317
 318                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
 319                         if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
 320                                 err = vdc_ack(port, &msgbuf);
 321                         else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
 322                                 err = vdc_nack(port, &msgbuf);
 323                         else
 324                                 err = vdc_handle_unknown(port, &msgbuf);
 325                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
 326                         err = vio_control_pkt_engine(vio, &msgbuf);
 327                 } else {
 328                         err = vdc_handle_unknown(port, &msgbuf);
 329                 }
 330                 if (err < 0)
 331                         break;
 332         }
 333         if (err < 0)
 334                 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
 335         spin_unlock_irqrestore(&vio->lock, flags);
 336 }
 337
 338 static int __vdc_tx_trigger(struct vdc_port *port)
 339 {
 340         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 341         struct vio_dring_data hdr = {
 342                 .tag = {
 343                         .type           = VIO_TYPE_DATA,
 344                         .stype          = VIO_SUBTYPE_INFO,
 345                         .stype_env      = VIO_DRING_DATA,
 346                         .sid            = vio_send_sid(&port->vio),
 347                 },
 348                 .dring_ident            = dr->ident,
 349                 .start_idx              = dr->prod,
 350                 .end_idx                = dr->prod,
 351         };
 352         int err, delay;
 353
 354         hdr.seq = dr->snd_nxt;
 355         delay = 1;
 356         do {
 357                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
 358                 if (err > 0) {
 359                         dr->snd_nxt++;
 360                         break;
 361                 }
 362                 udelay(delay);
 363                 if ((delay <<= 1) > 128)
 364                         delay = 128;
 365         } while (err == -EAGAIN);
 366
 367         return err;
 368 }
 369
 370 static int __send_request(struct request *req)
 371 {
 372         struct vdc_port *port = req->rq_disk->private_data;
 373         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 374         struct scatterlist sg[port->ring_cookies];
 375         struct vdc_req_entry *rqe;
 376         struct vio_disk_desc *desc;
 377         unsigned int map_perm;
 378         int nsg, err, i;
 379         u64 len;
 380         u8 op;
 381
 382         map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
 383
 384         if (rq_data_dir(req) == READ) {
 385                 map_perm |= LDC_MAP_W;
 386                 op = VD_OP_BREAD;
 387         } else {
 388                 map_perm |= LDC_MAP_R;
 389                 op = VD_OP_BWRITE;
 390         }
 391
 392         nsg = blk_rq_map_sg(req->q, req, sg);
 393
 394         len = 0;
 395         for (i = 0; i < nsg; i++)
 396                 len += sg[i].length;
 397
 398         if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
 399                 blk_stop_queue(port->disk->queue);
 400                 err = -ENOMEM;
 401                 goto out;
 402         }
 403
 404         desc = vio_dring_cur(dr);
 405
 406         err = ldc_map_sg(port->vio.lp, sg, nsg,
 407                          desc->cookies, port->ring_cookies,
 408                          map_perm);
 409         if (err < 0) {
 410                 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
 411                 return err;
 412         }
 413
 414         rqe = &port->rq_arr[dr->prod];
 415         rqe->req = req;
 416
 417         desc->hdr.ack = VIO_ACK_ENABLE;
 418         desc->req_id = port->req_id;
 419         desc->operation = op;
 420         if (port->vdisk_type == VD_DISK_TYPE_DISK) {
 421                 desc->slice = 2;
 422         } else {
 423                 desc->slice = 0;
 424         }
 425         desc->status = ~0;
 426         desc->offset = (req->sector << 9) / port->vdisk_block_size;
 427         desc->size = len;
 428         desc->ncookies = err;
 429
 430         /* This has to be a non-SMP write barrier because we are writing
 431          * to memory which is shared with the peer LDOM.
 432          */
 433         wmb();
 434         desc->hdr.state = VIO_DESC_READY;
 435
 436         err = __vdc_tx_trigger(port);
 437         if (err < 0) {
 438                 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
 439         } else {
 440                 port->req_id++;
 441                 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
 442         }
 443 out:
 444
 445         return err;
 446 }
 447
 448 static void do_vdc_request(request_queue_t *q)
 449 {
 450         while (1) {
 451                 struct request *req = elv_next_request(q);
 452
 453                 if (!req)
 454                         break;
 455
 456                 blkdev_dequeue_request(req);
 457                 if (__send_request(req) < 0)
 458                         vdc_end_request(req, 0, req->hard_nr_sectors);
 459         }
 460 }
 461
 462 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
 463 {
 464         struct vio_dring_state *dr;
 465         struct vio_completion comp;
 466         struct vio_disk_desc *desc;
 467         unsigned int map_perm;
 468         unsigned long flags;
 469         int op_len, err;
 470         void *req_buf;
 471
 472         if (!(((u64)1 << ((u64)op - 1)) & port->operations))
 473                 return -EOPNOTSUPP;
 474
 475         switch (op) {
 476         case VD_OP_BREAD:
 477         case VD_OP_BWRITE:
 478         default:
 479                 return -EINVAL;
 480
 481         case VD_OP_FLUSH:
 482                 op_len = 0;
 483                 map_perm = 0;
 484                 break;
 485
 486         case VD_OP_GET_WCE:
 487                 op_len = sizeof(u32);
 488                 map_perm = LDC_MAP_W;
 489                 break;
 490
 491         case VD_OP_SET_WCE:
 492                 op_len = sizeof(u32);
 493                 map_perm = LDC_MAP_R;
 494                 break;
 495
 496         case VD_OP_GET_VTOC:
 497                 op_len = sizeof(struct vio_disk_vtoc);
 498                 map_perm = LDC_MAP_W;
 499                 break;
 500
 501         case VD_OP_SET_VTOC:
 502                 op_len = sizeof(struct vio_disk_vtoc);
 503                 map_perm = LDC_MAP_R;
 504                 break;
 505
 506         case VD_OP_GET_DISKGEOM:
 507                 op_len = sizeof(struct vio_disk_geom);
 508                 map_perm = LDC_MAP_W;
 509                 break;
 510
 511         case VD_OP_SET_DISKGEOM:
 512                 op_len = sizeof(struct vio_disk_geom);
 513                 map_perm = LDC_MAP_R;
 514                 break;
 515
 516         case VD_OP_SCSICMD:
 517                 op_len = 16;
 518                 map_perm = LDC_MAP_RW;
 519                 break;
 520
 521         case VD_OP_GET_DEVID:
 522                 op_len = sizeof(struct vio_disk_devid);
 523                 map_perm = LDC_MAP_W;
 524                 break;
 525
 526         case VD_OP_GET_EFI:
 527         case VD_OP_SET_EFI:
 528                 return -EOPNOTSUPP;
 529                 break;
 530         };
 531
 532         map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
 533
 534         op_len = (op_len + 7) & ~7;
 535         req_buf = kzalloc(op_len, GFP_KERNEL);
 536         if (!req_buf)
 537                 return -ENOMEM;
 538
 539         if (len > op_len)
 540                 len = op_len;
 541
 542         if (map_perm & LDC_MAP_R)
 543                 memcpy(req_buf, buf, len);
 544
 545         spin_lock_irqsave(&port->vio.lock, flags);
 546
 547         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 548
 549         /* XXX If we want to use this code generically we have to
 550          * XXX handle TX ring exhaustion etc.
 551          */
 552         desc = vio_dring_cur(dr);
 553
 554         err = ldc_map_single(port->vio.lp, req_buf, op_len,
 555                              desc->cookies, port->ring_cookies,
 556                              map_perm);
 557         if (err < 0) {
 558                 spin_unlock_irqrestore(&port->vio.lock, flags);
 559                 kfree(req_buf);
 560                 return err;
 561         }
 562
 563         init_completion(&comp.com);
 564         comp.waiting_for = WAITING_FOR_GEN_CMD;
 565         port->vio.cmp = &comp;
 566
 567         desc->hdr.ack = VIO_ACK_ENABLE;
 568         desc->req_id = port->req_id;
 569         desc->operation = op;
 570         desc->slice = 0;
 571         desc->status = ~0;
 572         desc->offset = 0;
 573         desc->size = op_len;
 574         desc->ncookies = err;
 575
 576         /* This has to be a non-SMP write barrier because we are writing
 577          * to memory which is shared with the peer LDOM.
 578          */
 579         wmb();
 580         desc->hdr.state = VIO_DESC_READY;
 581
 582         err = __vdc_tx_trigger(port);
 583         if (err >= 0) {
 584                 port->req_id++;
 585                 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
 586                 spin_unlock_irqrestore(&port->vio.lock, flags);
 587
 588                 wait_for_completion(&comp.com);
 589                 err = comp.err;
 590         } else {
 591                 port->vio.cmp = NULL;
 592                 spin_unlock_irqrestore(&port->vio.lock, flags);
 593         }
 594
 595         if (map_perm & LDC_MAP_W)
 596                 memcpy(buf, req_buf, len);
 597
 598         kfree(req_buf);
 599
 600         return err;
 601 }
 602
 603 static int __devinit vdc_alloc_tx_ring(struct vdc_port *port)
 604 {
 605         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 606         unsigned long len, entry_size;
 607         int ncookies;
 608         void *dring;
 609
 610         entry_size = sizeof(struct vio_disk_desc) +
 611                 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
 612         len = (VDC_TX_RING_SIZE * entry_size);
 613
 614         ncookies = VIO_MAX_RING_COOKIES;
 615         dring = ldc_alloc_exp_dring(port->vio.lp, len,
 616                                     dr->cookies, &ncookies,
 617                                     (LDC_MAP_SHADOW |
 618                                      LDC_MAP_DIRECT |
 619                                      LDC_MAP_RW));
 620         if (IS_ERR(dring))
 621                 return PTR_ERR(dring);
 622
 623         dr->base = dring;
 624         dr->entry_size = entry_size;
 625         dr->num_entries = VDC_TX_RING_SIZE;
 626         dr->prod = dr->cons = 0;
 627         dr->pending = VDC_TX_RING_SIZE;
 628         dr->ncookies = ncookies;
 629
 630         return 0;
 631 }
 632
 633 static void vdc_free_tx_ring(struct vdc_port *port)
 634 {
 635         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 636
 637         if (dr->base) {
 638                 ldc_free_exp_dring(port->vio.lp, dr->base,
 639                                    (dr->entry_size * dr->num_entries),
 640                                    dr->cookies, dr->ncookies);
 641                 dr->base = NULL;
 642                 dr->entry_size = 0;
 643                 dr->num_entries = 0;
 644                 dr->pending = 0;
 645                 dr->ncookies = 0;
 646         }
 647 }
 648
 649 static int probe_disk(struct vdc_port *port)
 650 {
 651         struct vio_completion comp;
 652         struct request_queue *q;
 653         struct gendisk *g;
 654         int err;
 655
 656         init_completion(&comp.com);
 657         comp.err = 0;
 658         comp.waiting_for = WAITING_FOR_LINK_UP;
 659         port->vio.cmp = &comp;
 660
 661         vio_port_up(&port->vio);
 662
 663         wait_for_completion(&comp.com);
 664         if (comp.err)
 665                 return comp.err;
 666
 667         err = generic_request(port, VD_OP_GET_VTOC,
 668                               &port->label, sizeof(port->label));
 669         if (err < 0) {
 670                 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err);
 671                 return err;
 672         }
 673
 674         err = generic_request(port, VD_OP_GET_DISKGEOM,
 675                               &port->geom, sizeof(port->geom));
 676         if (err < 0) {
 677                 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
 678                        "error %d\n", err);
 679                 return err;
 680         }
 681
 682         port->vdisk_size = ((u64)port->geom.num_cyl *
 683                             (u64)port->geom.num_hd *
 684                             (u64)port->geom.num_sec);
 685
 686         q = blk_init_queue(do_vdc_request, &port->vio.lock);
 687         if (!q) {
 688                 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
 689                        port->vio.name);
 690                 return -ENOMEM;
 691         }
 692         g = alloc_disk(1 << PARTITION_SHIFT);
 693         if (!g) {
 694                 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
 695                        port->vio.name);
 696                 blk_cleanup_queue(q);
 697                 return -ENOMEM;
 698         }
 699
 700         port->disk = g;
 701
 702         blk_queue_max_hw_segments(q, port->ring_cookies);
 703         blk_queue_max_phys_segments(q, port->ring_cookies);
 704         blk_queue_max_sectors(q, port->max_xfer_size);
 705         g->major = vdc_major;
 706         g->first_minor = port->dev_no << PARTITION_SHIFT;
 707         strcpy(g->disk_name, port->disk_name);
 708
 709         g->fops = &vdc_fops;
 710         g->queue = q;
 711         g->private_data = port;
 712         g->driverfs_dev = &port->vio.vdev->dev;
 713
 714         set_capacity(g, port->vdisk_size);
 715
 716         printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n",
 717                g->disk_name,
 718                port->vdisk_size, (port->vdisk_size >> (20 - 9)));
 719
 720         add_disk(g);
 721
 722         return 0;
 723 }
 724
 725 static struct ldc_channel_config vdc_ldc_cfg = {
 726         .event          = vdc_event,
 727         .mtu            = 64,
 728         .mode           = LDC_MODE_UNRELIABLE,
 729 };
 730
 731 static struct vio_driver_ops vdc_vio_ops = {
 732         .send_attr              = vdc_send_attr,
 733         .handle_attr            = vdc_handle_attr,
 734         .handshake_complete     = vdc_handshake_complete,
 735 };
 736
 737 static void print_version(void)
 738 {
 739         static int version_printed;
 740
 741         if (version_printed++ == 0)
 742                 printk(KERN_INFO "%s", version);
 743 }
 744
 745 static int __devinit vdc_port_probe(struct vio_dev *vdev,
 746                                     const struct vio_device_id *id)
 747 {
 748         struct mdesc_handle *hp;
 749         struct vdc_port *port;
 750         const u64 *port_id;
 751         int err;
 752
 753         print_version();
 754
 755         hp = mdesc_grab();
 756
 757         port_id = mdesc_get_property(hp, vdev->mp, "id", NULL);
 758         err = -ENODEV;
 759         if (!port_id) {
 760                 printk(KERN_ERR PFX "Port lacks id property.\n");
 761                 goto err_out_release_mdesc;
 762         }
 763         if ((*port_id << PARTITION_SHIFT) & ~(u64)MINORMASK) {
 764                 printk(KERN_ERR PFX "Port id [%lu] too large.\n", *port_id);
 765                 goto err_out_release_mdesc;
 766         }
 767
 768         port = kzalloc(sizeof(*port), GFP_KERNEL);
 769         err = -ENOMEM;
 770         if (!port) {
 771                 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
 772                 goto err_out_release_mdesc;
 773         }
 774
 775         port->dev_no = *port_id;
 776
 777         if (port->dev_no >= 26)
 778                 snprintf(port->disk_name, sizeof(port->disk_name),
 779                          VDCBLK_NAME "%c%c",
 780                          'a' + (port->dev_no / 26) - 1,
 781                          'a' + (port->dev_no % 26));
 782         else
 783                 snprintf(port->disk_name, sizeof(port->disk_name),
 784                          VDCBLK_NAME "%c", 'a' + (port->dev_no % 26));
 785
 786         err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
 787                               vdc_versions, ARRAY_SIZE(vdc_versions),
 788                               &vdc_vio_ops, port->disk_name);
 789         if (err)
 790                 goto err_out_free_port;
 791
 792         port->vdisk_block_size = 512;
 793         port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
 794         port->ring_cookies = ((port->max_xfer_size *
 795                                port->vdisk_block_size) / PAGE_SIZE) + 2;
 796
 797         err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
 798         if (err)
 799                 goto err_out_free_port;
 800
 801         err = vdc_alloc_tx_ring(port);
 802         if (err)
 803                 goto err_out_free_ldc;
 804
 805         err = probe_disk(port);
 806         if (err)
 807                 goto err_out_free_tx_ring;
 808
 809         dev_set_drvdata(&vdev->dev, port);
 810
 811         mdesc_release(hp);
 812
 813         return 0;
 814
 815 err_out_free_tx_ring:
 816         vdc_free_tx_ring(port);
 817
 818 err_out_free_ldc:
 819         vio_ldc_free(&port->vio);
 820
 821 err_out_free_port:
 822         kfree(port);
 823
 824 err_out_release_mdesc:
 825         mdesc_release(hp);
 826         return err;
 827 }
 828
 829 static int vdc_port_remove(struct vio_dev *vdev)
 830 {
 831         struct vdc_port *port = dev_get_drvdata(&vdev->dev);
 832
 833         if (port) {
 834                 del_timer_sync(&port->vio.timer);
 835
 836                 vdc_free_tx_ring(port);
 837                 vio_ldc_free(&port->vio);
 838
 839                 dev_set_drvdata(&vdev->dev, NULL);
 840
 841                 kfree(port);
 842         }
 843         return 0;
 844 }
 845
 846 static struct vio_device_id vdc_port_match[] = {
 847         {
 848                 .type = "vdc-port",
 849         },
 850         {},
 851 };
 852 MODULE_DEVICE_TABLE(vio, vdc_match);
 853
 854 static struct vio_driver vdc_port_driver = {
 855         .id_table       = vdc_port_match,
 856         .probe          = vdc_port_probe,
 857         .remove         = vdc_port_remove,
 858         .driver         = {
 859                 .name   = "vdc_port",
 860                 .owner  = THIS_MODULE,
 861         }
 862 };
 863
 864 static int __init vdc_init(void)
 865 {
 866         int err;
 867
 868         err = register_blkdev(0, VDCBLK_NAME);
 869         if (err < 0)
 870                 goto out_err;
 871
 872         vdc_major = err;
 873
 874         err = vio_register_driver(&vdc_port_driver);
 875         if (err)
 876                 goto out_unregister_blkdev;
 877
 878         return 0;
 879
 880 out_unregister_blkdev:
 881         unregister_blkdev(vdc_major, VDCBLK_NAME);
 882         vdc_major = 0;
 883
 884 out_err:
 885         return err;
 886 }
 887
 888 static void __exit vdc_exit(void)
 889 {
 890         vio_unregister_driver(&vdc_port_driver);
 891         unregister_blkdev(vdc_major, VDCBLK_NAME);
 892 }
 893
 894 module_init(vdc_init);
 895 module_exit(vdc_exit);