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 vdc              *vp;
  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                      dev_no;
  70
  71         char                    disk_name[32];
  72
  73         struct vio_disk_geom    geom;
  74         struct vio_disk_vtoc    label;
  75
  76         struct list_head        list;
  77 };
  78
  79 static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
  80 {
  81         return container_of(vio, struct vdc_port, vio);
  82 }
  83
  84 struct vdc {
  85         /* Protects prot_list.  */
  86         spinlock_t              lock;
  87
  88         struct vio_dev          *dev;
  89
  90         struct list_head        port_list;
  91 };
  92
  93 /* Ordered from largest major to lowest */
  94 static struct vio_version vdc_versions[] = {
  95         { .major = 1, .minor = 0 },
  96 };
  97
  98 #define VDCBLK_NAME     "vdisk"
  99 static int vdc_major;
 100 #define PARTITION_SHIFT 3
 101
 102 static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
 103 {
 104         return vio_dring_avail(dr, VDC_TX_RING_SIZE);
 105 }
 106
 107 static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 108 {
 109         struct gendisk *disk = bdev->bd_disk;
 110         struct vdc_port *port = disk->private_data;
 111
 112         geo->heads = (u8) port->geom.num_hd;
 113         geo->sectors = (u8) port->geom.num_sec;
 114         geo->cylinders = port->geom.num_cyl;
 115
 116         return 0;
 117 }
 118
 119 static struct block_device_operations vdc_fops = {
 120         .owner          = THIS_MODULE,
 121         .getgeo         = vdc_getgeo,
 122 };
 123
 124 static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
 125 {
 126         if (vio->cmp &&
 127             (waiting_for == -1 ||
 128              vio->cmp->waiting_for == waiting_for)) {
 129                 vio->cmp->err = err;
 130                 complete(&vio->cmp->com);
 131                 vio->cmp = NULL;
 132         }
 133 }
 134
 135 static void vdc_handshake_complete(struct vio_driver_state *vio)
 136 {
 137         vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
 138 }
 139
 140 static int vdc_handle_unknown(struct vdc_port *port, void *arg)
 141 {
 142         struct vio_msg_tag *pkt = arg;
 143
 144         printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
 145                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
 146         printk(KERN_ERR PFX "Resetting connection.\n");
 147
 148         ldc_disconnect(port->vio.lp);
 149
 150         return -ECONNRESET;
 151 }
 152
 153 static int vdc_send_attr(struct vio_driver_state *vio)
 154 {
 155         struct vdc_port *port = to_vdc_port(vio);
 156         struct vio_disk_attr_info pkt;
 157
 158         memset(&pkt, 0, sizeof(pkt));
 159
 160         pkt.tag.type = VIO_TYPE_CTRL;
 161         pkt.tag.stype = VIO_SUBTYPE_INFO;
 162         pkt.tag.stype_env = VIO_ATTR_INFO;
 163         pkt.tag.sid = vio_send_sid(vio);
 164
 165         pkt.xfer_mode = VIO_DRING_MODE;
 166         pkt.vdisk_block_size = port->vdisk_block_size;
 167         pkt.max_xfer_size = port->max_xfer_size;
 168
 169         viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n",
 170                pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
 171
 172         return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
 173 }
 174
 175 static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
 176 {
 177         struct vdc_port *port = to_vdc_port(vio);
 178         struct vio_disk_attr_info *pkt = arg;
 179
 180         viodbg(HS, "GOT ATTR stype[0x%x] ops[%lx] disk_size[%lu] disk_type[%x] "
 181                "xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n",
 182                pkt->tag.stype, pkt->operations,
 183                pkt->vdisk_size, pkt->vdisk_type,
 184                pkt->xfer_mode, pkt->vdisk_block_size,
 185                pkt->max_xfer_size);
 186
 187         if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
 188                 switch (pkt->vdisk_type) {
 189                 case VD_DISK_TYPE_DISK:
 190                 case VD_DISK_TYPE_SLICE:
 191                         break;
 192
 193                 default:
 194                         printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
 195                                vio->name, pkt->vdisk_type);
 196                         return -ECONNRESET;
 197                 }
 198
 199                 if (pkt->vdisk_block_size > port->vdisk_block_size) {
 200                         printk(KERN_ERR PFX "%s: BLOCK size increased "
 201                                "%u --> %u\n",
 202                                vio->name,
 203                                port->vdisk_block_size, pkt->vdisk_block_size);
 204                         return -ECONNRESET;
 205                 }
 206
 207                 port->operations = pkt->operations;
 208                 port->vdisk_size = pkt->vdisk_size;
 209                 port->vdisk_type = pkt->vdisk_type;
 210                 if (pkt->max_xfer_size < port->max_xfer_size)
 211                         port->max_xfer_size = pkt->max_xfer_size;
 212                 port->vdisk_block_size = pkt->vdisk_block_size;
 213                 return 0;
 214         } else {
 215                 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
 216
 217                 return -ECONNRESET;
 218         }
 219 }
 220
 221 static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
 222 {
 223         int err = desc->status;
 224
 225         vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
 226 }
 227
 228 static void vdc_end_request(struct request *req, int uptodate, int num_sectors)
 229 {
 230         if (end_that_request_first(req, uptodate, num_sectors))
 231                 return;
 232         add_disk_randomness(req->rq_disk);
 233         end_that_request_last(req, uptodate);
 234 }
 235
 236 static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
 237                         unsigned int index)
 238 {
 239         struct vio_disk_desc *desc = vio_dring_entry(dr, index);
 240         struct vdc_req_entry *rqe = &port->rq_arr[index];
 241         struct request *req;
 242
 243         if (unlikely(desc->hdr.state != VIO_DESC_DONE))
 244                 return;
 245
 246         ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
 247         desc->hdr.state = VIO_DESC_FREE;
 248         dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1);
 249
 250         req = rqe->req;
 251         if (req == NULL) {
 252                 vdc_end_special(port, desc);
 253                 return;
 254         }
 255
 256         rqe->req = NULL;
 257
 258         vdc_end_request(req, !desc->status, desc->size >> 9);
 259
 260         if (blk_queue_stopped(port->disk->queue))
 261                 blk_start_queue(port->disk->queue);
 262 }
 263
 264 static int vdc_ack(struct vdc_port *port, void *msgbuf)
 265 {
 266         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 267         struct vio_dring_data *pkt = msgbuf;
 268
 269         if (unlikely(pkt->dring_ident != dr->ident ||
 270                      pkt->start_idx != pkt->end_idx ||
 271                      pkt->start_idx >= VDC_TX_RING_SIZE))
 272                 return 0;
 273
 274         vdc_end_one(port, dr, pkt->start_idx);
 275
 276         return 0;
 277 }
 278
 279 static int vdc_nack(struct vdc_port *port, void *msgbuf)
 280 {
 281         /* XXX Implement me XXX */
 282         return 0;
 283 }
 284
 285 static void vdc_event(void *arg, int event)
 286 {
 287         struct vdc_port *port = arg;
 288         struct vio_driver_state *vio = &port->vio;
 289         unsigned long flags;
 290         int err;
 291
 292         spin_lock_irqsave(&vio->lock, flags);
 293
 294         if (unlikely(event == LDC_EVENT_RESET ||
 295                      event == LDC_EVENT_UP)) {
 296                 vio_link_state_change(vio, event);
 297                 spin_unlock_irqrestore(&vio->lock, flags);
 298                 return;
 299         }
 300
 301         if (unlikely(event != LDC_EVENT_DATA_READY)) {
 302                 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
 303                 spin_unlock_irqrestore(&vio->lock, flags);
 304                 return;
 305         }
 306
 307         err = 0;
 308         while (1) {
 309                 union {
 310                         struct vio_msg_tag tag;
 311                         u64 raw[8];
 312                 } msgbuf;
 313
 314                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
 315                 if (unlikely(err < 0)) {
 316                         if (err == -ECONNRESET)
 317                                 vio_conn_reset(vio);
 318                         break;
 319                 }
 320                 if (err == 0)
 321                         break;
 322                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
 323                        msgbuf.tag.type,
 324                        msgbuf.tag.stype,
 325                        msgbuf.tag.stype_env,
 326                        msgbuf.tag.sid);
 327                 err = vio_validate_sid(vio, &msgbuf.tag);
 328                 if (err < 0)
 329                         break;
 330
 331                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
 332                         if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
 333                                 err = vdc_ack(port, &msgbuf);
 334                         else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
 335                                 err = vdc_nack(port, &msgbuf);
 336                         else
 337                                 err = vdc_handle_unknown(port, &msgbuf);
 338                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
 339                         err = vio_control_pkt_engine(vio, &msgbuf);
 340                 } else {
 341                         err = vdc_handle_unknown(port, &msgbuf);
 342                 }
 343                 if (err < 0)
 344                         break;
 345         }
 346         if (err < 0)
 347                 vdc_finish(&port->vio, err, WAITING_FOR_ANY);
 348         spin_unlock_irqrestore(&vio->lock, flags);
 349 }
 350
 351 static int __vdc_tx_trigger(struct vdc_port *port)
 352 {
 353         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 354         struct vio_dring_data hdr = {
 355                 .tag = {
 356                         .type           = VIO_TYPE_DATA,
 357                         .stype          = VIO_SUBTYPE_INFO,
 358                         .stype_env      = VIO_DRING_DATA,
 359                         .sid            = vio_send_sid(&port->vio),
 360                 },
 361                 .dring_ident            = dr->ident,
 362                 .start_idx              = dr->prod,
 363                 .end_idx                = dr->prod,
 364         };
 365         int err, delay;
 366
 367         hdr.seq = dr->snd_nxt;
 368         delay = 1;
 369         do {
 370                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
 371                 if (err > 0) {
 372                         dr->snd_nxt++;
 373                         break;
 374                 }
 375                 udelay(delay);
 376                 if ((delay <<= 1) > 128)
 377                         delay = 128;
 378         } while (err == -EAGAIN);
 379
 380         return err;
 381 }
 382
 383 static int __send_request(struct request *req)
 384 {
 385         struct vdc_port *port = req->rq_disk->private_data;
 386         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 387         struct scatterlist sg[port->ring_cookies];
 388         struct vdc_req_entry *rqe;
 389         struct vio_disk_desc *desc;
 390         unsigned int map_perm;
 391         int nsg, err, i;
 392         u64 len;
 393         u8 op;
 394
 395         map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
 396
 397         if (rq_data_dir(req) == READ) {
 398                 map_perm |= LDC_MAP_W;
 399                 op = VD_OP_BREAD;
 400         } else {
 401                 map_perm |= LDC_MAP_R;
 402                 op = VD_OP_BWRITE;
 403         }
 404
 405         nsg = blk_rq_map_sg(req->q, req, sg);
 406
 407         len = 0;
 408         for (i = 0; i < nsg; i++)
 409                 len += sg[i].length;
 410
 411         if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
 412                 blk_stop_queue(port->disk->queue);
 413                 err = -ENOMEM;
 414                 goto out;
 415         }
 416
 417         desc = vio_dring_cur(dr);
 418
 419         err = ldc_map_sg(port->vio.lp, sg, nsg,
 420                          desc->cookies, port->ring_cookies,
 421                          map_perm);
 422         if (err < 0) {
 423                 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
 424                 return err;
 425         }
 426
 427         rqe = &port->rq_arr[dr->prod];
 428         rqe->req = req;
 429
 430         desc->hdr.ack = VIO_ACK_ENABLE;
 431         desc->req_id = port->req_id;
 432         desc->operation = op;
 433         if (port->vdisk_type == VD_DISK_TYPE_DISK) {
 434                 desc->slice = 2;
 435         } else {
 436                 desc->slice = 0;
 437         }
 438         desc->status = ~0;
 439         desc->offset = (req->sector << 9) / port->vdisk_block_size;
 440         desc->size = len;
 441         desc->ncookies = err;
 442
 443         /* This has to be a non-SMP write barrier because we are writing
 444          * to memory which is shared with the peer LDOM.
 445          */
 446         wmb();
 447         desc->hdr.state = VIO_DESC_READY;
 448
 449         err = __vdc_tx_trigger(port);
 450         if (err < 0) {
 451                 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
 452         } else {
 453                 port->req_id++;
 454                 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
 455         }
 456 out:
 457
 458         return err;
 459 }
 460
 461 static void do_vdc_request(request_queue_t *q)
 462 {
 463         while (1) {
 464                 struct request *req = elv_next_request(q);
 465
 466                 if (!req)
 467                         break;
 468
 469                 blkdev_dequeue_request(req);
 470                 if (__send_request(req) < 0)
 471                         vdc_end_request(req, 0, req->hard_nr_sectors);
 472         }
 473 }
 474
 475 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
 476 {
 477         struct vio_dring_state *dr;
 478         struct vio_completion comp;
 479         struct vio_disk_desc *desc;
 480         unsigned int map_perm;
 481         unsigned long flags;
 482         int op_len, err;
 483         void *req_buf;
 484
 485         if (!(((u64)1 << ((u64)op - 1)) & port->operations))
 486                 return -EOPNOTSUPP;
 487
 488         switch (op) {
 489         case VD_OP_BREAD:
 490         case VD_OP_BWRITE:
 491         default:
 492                 return -EINVAL;
 493
 494         case VD_OP_FLUSH:
 495                 op_len = 0;
 496                 map_perm = 0;
 497                 break;
 498
 499         case VD_OP_GET_WCE:
 500                 op_len = sizeof(u32);
 501                 map_perm = LDC_MAP_W;
 502                 break;
 503
 504         case VD_OP_SET_WCE:
 505                 op_len = sizeof(u32);
 506                 map_perm = LDC_MAP_R;
 507                 break;
 508
 509         case VD_OP_GET_VTOC:
 510                 op_len = sizeof(struct vio_disk_vtoc);
 511                 map_perm = LDC_MAP_W;
 512                 break;
 513
 514         case VD_OP_SET_VTOC:
 515                 op_len = sizeof(struct vio_disk_vtoc);
 516                 map_perm = LDC_MAP_R;
 517                 break;
 518
 519         case VD_OP_GET_DISKGEOM:
 520                 op_len = sizeof(struct vio_disk_geom);
 521                 map_perm = LDC_MAP_W;
 522                 break;
 523
 524         case VD_OP_SET_DISKGEOM:
 525                 op_len = sizeof(struct vio_disk_geom);
 526                 map_perm = LDC_MAP_R;
 527                 break;
 528
 529         case VD_OP_SCSICMD:
 530                 op_len = 16;
 531                 map_perm = LDC_MAP_RW;
 532                 break;
 533
 534         case VD_OP_GET_DEVID:
 535                 op_len = sizeof(struct vio_disk_devid);
 536                 map_perm = LDC_MAP_W;
 537                 break;
 538
 539         case VD_OP_GET_EFI:
 540         case VD_OP_SET_EFI:
 541                 return -EOPNOTSUPP;
 542                 break;
 543         };
 544
 545         map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
 546
 547         op_len = (op_len + 7) & ~7;
 548         req_buf = kzalloc(op_len, GFP_KERNEL);
 549         if (!req_buf)
 550                 return -ENOMEM;
 551
 552         if (len > op_len)
 553                 len = op_len;
 554
 555         if (map_perm & LDC_MAP_R)
 556                 memcpy(req_buf, buf, len);
 557
 558         spin_lock_irqsave(&port->vio.lock, flags);
 559
 560         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 561
 562         /* XXX If we want to use this code generically we have to
 563          * XXX handle TX ring exhaustion etc.
 564          */
 565         desc = vio_dring_cur(dr);
 566
 567         err = ldc_map_single(port->vio.lp, req_buf, op_len,
 568                              desc->cookies, port->ring_cookies,
 569                              map_perm);
 570         if (err < 0) {
 571                 spin_unlock_irqrestore(&port->vio.lock, flags);
 572                 kfree(req_buf);
 573                 return err;
 574         }
 575
 576         init_completion(&comp.com);
 577         comp.waiting_for = WAITING_FOR_GEN_CMD;
 578         port->vio.cmp = &comp;
 579
 580         desc->hdr.ack = VIO_ACK_ENABLE;
 581         desc->req_id = port->req_id;
 582         desc->operation = op;
 583         desc->slice = 0;
 584         desc->status = ~0;
 585         desc->offset = 0;
 586         desc->size = op_len;
 587         desc->ncookies = err;
 588
 589         /* This has to be a non-SMP write barrier because we are writing
 590          * to memory which is shared with the peer LDOM.
 591          */
 592         wmb();
 593         desc->hdr.state = VIO_DESC_READY;
 594
 595         err = __vdc_tx_trigger(port);
 596         if (err >= 0) {
 597                 port->req_id++;
 598                 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
 599                 spin_unlock_irqrestore(&port->vio.lock, flags);
 600
 601                 wait_for_completion(&comp.com);
 602                 err = comp.err;
 603         } else {
 604                 port->vio.cmp = NULL;
 605                 spin_unlock_irqrestore(&port->vio.lock, flags);
 606         }
 607
 608         if (map_perm & LDC_MAP_W)
 609                 memcpy(buf, req_buf, len);
 610
 611         kfree(req_buf);
 612
 613         return err;
 614 }
 615
 616 static int __devinit vdc_alloc_tx_ring(struct vdc_port *port)
 617 {
 618         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 619         unsigned long len, entry_size;
 620         int ncookies;
 621         void *dring;
 622
 623         entry_size = sizeof(struct vio_disk_desc) +
 624                 (sizeof(struct ldc_trans_cookie) * port->ring_cookies);
 625         len = (VDC_TX_RING_SIZE * entry_size);
 626
 627         ncookies = VIO_MAX_RING_COOKIES;
 628         dring = ldc_alloc_exp_dring(port->vio.lp, len,
 629                                     dr->cookies, &ncookies,
 630                                     (LDC_MAP_SHADOW |
 631                                      LDC_MAP_DIRECT |
 632                                      LDC_MAP_RW));
 633         if (IS_ERR(dring))
 634                 return PTR_ERR(dring);
 635
 636         dr->base = dring;
 637         dr->entry_size = entry_size;
 638         dr->num_entries = VDC_TX_RING_SIZE;
 639         dr->prod = dr->cons = 0;
 640         dr->pending = VDC_TX_RING_SIZE;
 641         dr->ncookies = ncookies;
 642
 643         return 0;
 644 }
 645
 646 static void vdc_free_tx_ring(struct vdc_port *port)
 647 {
 648         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 649
 650         if (dr->base) {
 651                 ldc_free_exp_dring(port->vio.lp, dr->base,
 652                                    (dr->entry_size * dr->num_entries),
 653                                    dr->cookies, dr->ncookies);
 654                 dr->base = NULL;
 655                 dr->entry_size = 0;
 656                 dr->num_entries = 0;
 657                 dr->pending = 0;
 658                 dr->ncookies = 0;
 659         }
 660 }
 661
 662 static int probe_disk(struct vdc_port *port)
 663 {
 664         struct vio_completion comp;
 665         struct request_queue *q;
 666         struct gendisk *g;
 667         int err;
 668
 669         init_completion(&comp.com);
 670         comp.err = 0;
 671         comp.waiting_for = WAITING_FOR_LINK_UP;
 672         port->vio.cmp = &comp;
 673
 674         vio_port_up(&port->vio);
 675
 676         wait_for_completion(&comp.com);
 677         if (comp.err)
 678                 return comp.err;
 679
 680         err = generic_request(port, VD_OP_GET_VTOC,
 681                               &port->label, sizeof(port->label));
 682         if (err < 0) {
 683                 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err);
 684                 return err;
 685         }
 686
 687         err = generic_request(port, VD_OP_GET_DISKGEOM,
 688                               &port->geom, sizeof(port->geom));
 689         if (err < 0) {
 690                 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
 691                        "error %d\n", err);
 692                 return err;
 693         }
 694
 695         port->vdisk_size = ((u64)port->geom.num_cyl *
 696                             (u64)port->geom.num_hd *
 697                             (u64)port->geom.num_sec);
 698
 699         q = blk_init_queue(do_vdc_request, &port->vio.lock);
 700         if (!q) {
 701                 printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
 702                        port->vio.name);
 703                 return -ENOMEM;
 704         }
 705         g = alloc_disk(1 << PARTITION_SHIFT);
 706         if (!g) {
 707                 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
 708                        port->vio.name);
 709                 blk_cleanup_queue(q);
 710                 return -ENOMEM;
 711         }
 712
 713         port->disk = g;
 714
 715         blk_queue_max_hw_segments(q, port->ring_cookies);
 716         blk_queue_max_phys_segments(q, port->ring_cookies);
 717         blk_queue_max_sectors(q, port->max_xfer_size);
 718         g->major = vdc_major;
 719         g->first_minor = port->dev_no << PARTITION_SHIFT;
 720         strcpy(g->disk_name, port->disk_name);
 721
 722         g->fops = &vdc_fops;
 723         g->queue = q;
 724         g->private_data = port;
 725         g->driverfs_dev = &port->vio.vdev->dev;
 726
 727         set_capacity(g, port->vdisk_size);
 728
 729         printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n",
 730                g->disk_name,
 731                port->vdisk_size, (port->vdisk_size >> (20 - 9)));
 732
 733         add_disk(g);
 734
 735         return 0;
 736 }
 737
 738 static struct ldc_channel_config vdc_ldc_cfg = {
 739         .event          = vdc_event,
 740         .mtu            = 64,
 741         .mode           = LDC_MODE_UNRELIABLE,
 742 };
 743
 744 static struct vio_driver_ops vdc_vio_ops = {
 745         .send_attr              = vdc_send_attr,
 746         .handle_attr            = vdc_handle_attr,
 747         .handshake_complete     = vdc_handshake_complete,
 748 };
 749
 750 static int __devinit vdc_port_probe(struct vio_dev *vdev,
 751                                     const struct vio_device_id *id)
 752 {
 753         struct mdesc_handle *hp;
 754         struct vdc_port *port;
 755         unsigned long flags;
 756         struct vdc *vp;
 757         const u64 *port_id;
 758         int err;
 759
 760         vp = dev_get_drvdata(vdev->dev.parent);
 761         if (!vp) {
 762                 printk(KERN_ERR PFX "Cannot find port parent vdc.\n");
 763                 return -ENODEV;
 764         }
 765
 766         hp = mdesc_grab();
 767
 768         port_id = mdesc_get_property(hp, vdev->mp, "id", NULL);
 769         err = -ENODEV;
 770         if (!port_id) {
 771                 printk(KERN_ERR PFX "Port lacks id property.\n");
 772                 goto err_out_release_mdesc;
 773         }
 774         if ((*port_id << PARTITION_SHIFT) & ~(u64)MINORMASK) {
 775                 printk(KERN_ERR PFX "Port id [%lu] too large.\n", *port_id);
 776                 goto err_out_release_mdesc;
 777         }
 778
 779         port = kzalloc(sizeof(*port), GFP_KERNEL);
 780         err = -ENOMEM;
 781         if (!port) {
 782                 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
 783                 goto err_out_release_mdesc;
 784         }
 785
 786         port->vp = vp;
 787         port->dev_no = *port_id;
 788
 789         if (port->dev_no >= 26)
 790                 snprintf(port->disk_name, sizeof(port->disk_name),
 791                          VDCBLK_NAME "%c%c",
 792                          'a' + (port->dev_no / 26) - 1,
 793                          'a' + (port->dev_no % 26));
 794         else
 795                 snprintf(port->disk_name, sizeof(port->disk_name),
 796                          VDCBLK_NAME "%c", 'a' + (port->dev_no % 26));
 797
 798         err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
 799                               vdc_versions, ARRAY_SIZE(vdc_versions),
 800                               &vdc_vio_ops, port->disk_name);
 801         if (err)
 802                 goto err_out_free_port;
 803
 804         port->vdisk_block_size = 512;
 805         port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
 806         port->ring_cookies = ((port->max_xfer_size *
 807                                port->vdisk_block_size) / PAGE_SIZE) + 2;
 808
 809         err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
 810         if (err)
 811                 goto err_out_free_port;
 812
 813         err = vdc_alloc_tx_ring(port);
 814         if (err)
 815                 goto err_out_free_ldc;
 816
 817         err = probe_disk(port);
 818         if (err)
 819                 goto err_out_free_tx_ring;
 820
 821         INIT_LIST_HEAD(&port->list);
 822
 823         spin_lock_irqsave(&vp->lock, flags);
 824         list_add(&port->list, &vp->port_list);
 825         spin_unlock_irqrestore(&vp->lock, flags);
 826
 827         dev_set_drvdata(&vdev->dev, port);
 828
 829         mdesc_release(hp);
 830
 831         return 0;
 832
 833 err_out_free_tx_ring:
 834         vdc_free_tx_ring(port);
 835
 836 err_out_free_ldc:
 837         vio_ldc_free(&port->vio);
 838
 839 err_out_free_port:
 840         kfree(port);
 841
 842 err_out_release_mdesc:
 843         mdesc_release(hp);
 844         return err;
 845 }
 846
 847 static int vdc_port_remove(struct vio_dev *vdev)
 848 {
 849         struct vdc_port *port = dev_get_drvdata(&vdev->dev);
 850
 851         if (port) {
 852                 del_timer_sync(&port->vio.timer);
 853
 854                 vdc_free_tx_ring(port);
 855                 vio_ldc_free(&port->vio);
 856
 857                 dev_set_drvdata(&vdev->dev, NULL);
 858
 859                 kfree(port);
 860         }
 861         return 0;
 862 }
 863
 864 static struct vio_device_id vdc_port_match[] = {
 865         {
 866                 .type = "vdc-port",
 867         },
 868         {},
 869 };
 870 MODULE_DEVICE_TABLE(vio, vdc_match);
 871
 872 static struct vio_driver vdc_port_driver = {
 873         .id_table       = vdc_port_match,
 874         .probe          = vdc_port_probe,
 875         .remove         = vdc_port_remove,
 876         .driver         = {
 877                 .name   = "vdc_port",
 878                 .owner  = THIS_MODULE,
 879         }
 880 };
 881
 882 static int __devinit vdc_probe(struct vio_dev *vdev,
 883                                const struct vio_device_id *id)
 884 {
 885         static int vdc_version_printed;
 886         struct vdc *vp;
 887
 888         if (vdc_version_printed++ == 0)
 889                 printk(KERN_INFO "%s", version);
 890
 891         vp = kzalloc(sizeof(struct vdc), GFP_KERNEL);
 892         if (!vp)
 893                 return -ENOMEM;
 894
 895         spin_lock_init(&vp->lock);
 896         vp->dev = vdev;
 897         INIT_LIST_HEAD(&vp->port_list);
 898
 899         dev_set_drvdata(&vdev->dev, vp);
 900
 901         return 0;
 902 }
 903
 904 static int vdc_remove(struct vio_dev *vdev)
 905 {
 906
 907         struct vdc *vp = dev_get_drvdata(&vdev->dev);
 908
 909         if (vp) {
 910                 kfree(vp);
 911                 dev_set_drvdata(&vdev->dev, NULL);
 912         }
 913         return 0;
 914 }
 915
 916 static struct vio_device_id vdc_match[] = {
 917         {
 918                 .type = "block",
 919         },
 920         {},
 921 };
 922 MODULE_DEVICE_TABLE(vio, vdc_match);
 923
 924 static struct vio_driver vdc_driver = {
 925         .id_table       = vdc_match,
 926         .probe          = vdc_probe,
 927         .remove         = vdc_remove,
 928         .driver         = {
 929                 .name   = "vdc",
 930                 .owner  = THIS_MODULE,
 931         }
 932 };
 933
 934 static int __init vdc_init(void)
 935 {
 936         int err;
 937
 938         err = register_blkdev(0, VDCBLK_NAME);
 939         if (err < 0)
 940                 goto out_err;
 941
 942         vdc_major = err;
 943         err = vio_register_driver(&vdc_driver);
 944         if (err)
 945                 goto out_unregister_blkdev;
 946
 947         err = vio_register_driver(&vdc_port_driver);
 948         if (err)
 949                 goto out_unregister_vdc;
 950
 951         return 0;
 952
 953 out_unregister_vdc:
 954         vio_unregister_driver(&vdc_driver);
 955
 956 out_unregister_blkdev:
 957         unregister_blkdev(vdc_major, VDCBLK_NAME);
 958         vdc_major = 0;
 959
 960 out_err:
 961         return err;
 962 }
 963
 964 static void __exit vdc_exit(void)
 965 {
 966         vio_unregister_driver(&vdc_port_driver);
 967         vio_unregister_driver(&vdc_driver);
 968         unregister_blkdev(vdc_major, VDCBLK_NAME);
 969 }
 970
 971 module_init(vdc_init);
 972 module_exit(vdc_exit);