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   1 /* viohs.c: LDOM Virtual I/O handshake helper layer.
   2  *
   3  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/string.h>
   9 #include <linux/delay.h>
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12
  13 #include <asm/ldc.h>
  14 #include <asm/vio.h>
  15
  16 int vio_ldc_send(struct vio_driver_state *vio, void *data, int len)
  17 {
  18         int err, limit = 1000;
  19
  20         err = -EINVAL;
  21         while (limit-- > 0) {
  22                 err = ldc_write(vio->lp, data, len);
  23                 if (!err || (err != -EAGAIN))
  24                         break;
  25                 udelay(1);
  26         }
  27
  28         return err;
  29 }
  30 EXPORT_SYMBOL(vio_ldc_send);
  31
  32 static int send_ctrl(struct vio_driver_state *vio,
  33                      struct vio_msg_tag *tag, int len)
  34 {
  35         tag->sid = vio_send_sid(vio);
  36         return vio_ldc_send(vio, tag, len);
  37 }
  38
  39 static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env)
  40 {
  41         tag->type = type;
  42         tag->stype = stype;
  43         tag->stype_env = stype_env;
  44 }
  45
  46 static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
  47 {
  48         struct vio_ver_info pkt;
  49
  50         vio->_local_sid = (u32) sched_clock();
  51
  52         memset(&pkt, 0, sizeof(pkt));
  53         init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
  54         pkt.major = major;
  55         pkt.minor = minor;
  56         pkt.dev_class = vio->dev_class;
  57
  58         viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
  59                major, minor, vio->dev_class);
  60
  61         return send_ctrl(vio, &pkt.tag, sizeof(pkt));
  62 }
  63
  64 static int start_handshake(struct vio_driver_state *vio)
  65 {
  66         int err;
  67
  68         viodbg(HS, "START HANDSHAKE\n");
  69
  70         vio->hs_state = VIO_HS_INVALID;
  71
  72         err = send_version(vio,
  73                            vio->ver_table[0].major,
  74                            vio->ver_table[0].minor);
  75         if (err < 0)
  76                 return err;
  77
  78         return 0;
  79 }
  80
  81 static void flush_rx_dring(struct vio_driver_state *vio)
  82 {
  83         struct vio_dring_state *dr;
  84         u64 ident;
  85
  86         BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG));
  87
  88         dr = &vio->drings[VIO_DRIVER_RX_RING];
  89         ident = dr->ident;
  90
  91         BUG_ON(!vio->desc_buf);
  92         kfree(vio->desc_buf);
  93         vio->desc_buf = NULL;
  94
  95         memset(dr, 0, sizeof(*dr));
  96         dr->ident = ident;
  97 }
  98
  99 void vio_link_state_change(struct vio_driver_state *vio, int event)
 100 {
 101         if (event == LDC_EVENT_UP) {
 102                 vio->hs_state = VIO_HS_INVALID;
 103
 104                 switch (vio->dev_class) {
 105                 case VDEV_NETWORK:
 106                 case VDEV_NETWORK_SWITCH:
 107                         vio->dr_state = (VIO_DR_STATE_TXREQ |
 108                                          VIO_DR_STATE_RXREQ);
 109                         break;
 110
 111                 case VDEV_DISK:
 112                         vio->dr_state = VIO_DR_STATE_TXREQ;
 113                         break;
 114                 case VDEV_DISK_SERVER:
 115                         vio->dr_state = VIO_DR_STATE_RXREQ;
 116                         break;
 117                 }
 118                 start_handshake(vio);
 119         } else if (event == LDC_EVENT_RESET) {
 120                 vio->hs_state = VIO_HS_INVALID;
 121
 122                 if (vio->dr_state & VIO_DR_STATE_RXREG)
 123                         flush_rx_dring(vio);
 124
 125                 vio->dr_state = 0x00;
 126                 memset(&vio->ver, 0, sizeof(vio->ver));
 127
 128                 ldc_disconnect(vio->lp);
 129         }
 130 }
 131 EXPORT_SYMBOL(vio_link_state_change);
 132
 133 static int handshake_failure(struct vio_driver_state *vio)
 134 {
 135         struct vio_dring_state *dr;
 136
 137         /* XXX Put policy here...  Perhaps start a timer to fire
 138          * XXX in 100 ms, which will bring the link up and retry
 139          * XXX the handshake.
 140          */
 141
 142         viodbg(HS, "HANDSHAKE FAILURE\n");
 143
 144         vio->dr_state &= ~(VIO_DR_STATE_TXREG |
 145                            VIO_DR_STATE_RXREG);
 146
 147         dr = &vio->drings[VIO_DRIVER_RX_RING];
 148         memset(dr, 0, sizeof(*dr));
 149
 150         kfree(vio->desc_buf);
 151         vio->desc_buf = NULL;
 152         vio->desc_buf_len = 0;
 153
 154         vio->hs_state = VIO_HS_INVALID;
 155
 156         return -ECONNRESET;
 157 }
 158
 159 static int process_unknown(struct vio_driver_state *vio, void *arg)
 160 {
 161         struct vio_msg_tag *pkt = arg;
 162
 163         viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
 164                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
 165
 166         printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
 167                vio->vdev->channel_id);
 168
 169         ldc_disconnect(vio->lp);
 170
 171         return -ECONNRESET;
 172 }
 173
 174 static int send_dreg(struct vio_driver_state *vio)
 175 {
 176         struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
 177         union {
 178                 struct vio_dring_register pkt;
 179                 char all[sizeof(struct vio_dring_register) +
 180                          (sizeof(struct ldc_trans_cookie) *
 181                           dr->ncookies)];
 182         } u;
 183         int i;
 184
 185         memset(&u, 0, sizeof(u));
 186         init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
 187         u.pkt.dring_ident = 0;
 188         u.pkt.num_descr = dr->num_entries;
 189         u.pkt.descr_size = dr->entry_size;
 190         u.pkt.options = VIO_TX_DRING;
 191         u.pkt.num_cookies = dr->ncookies;
 192
 193         viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
 194                "ncookies[%u]\n",
 195                u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
 196                u.pkt.num_cookies);
 197
 198         for (i = 0; i < dr->ncookies; i++) {
 199                 u.pkt.cookies[i] = dr->cookies[i];
 200
 201                 viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
 202                        i,
 203                        (unsigned long long) u.pkt.cookies[i].cookie_addr,
 204                        (unsigned long long) u.pkt.cookies[i].cookie_size);
 205         }
 206
 207         return send_ctrl(vio, &u.pkt.tag, sizeof(u));
 208 }
 209
 210 static int send_rdx(struct vio_driver_state *vio)
 211 {
 212         struct vio_rdx pkt;
 213
 214         memset(&pkt, 0, sizeof(pkt));
 215
 216         init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);
 217
 218         viodbg(HS, "SEND RDX INFO\n");
 219
 220         return send_ctrl(vio, &pkt.tag, sizeof(pkt));
 221 }
 222
 223 static int send_attr(struct vio_driver_state *vio)
 224 {
 225         return vio->ops->send_attr(vio);
 226 }
 227
 228 static struct vio_version *find_by_major(struct vio_driver_state *vio,
 229                                          u16 major)
 230 {
 231         struct vio_version *ret = NULL;
 232         int i;
 233
 234         for (i = 0; i < vio->ver_table_entries; i++) {
 235                 struct vio_version *v = &vio->ver_table[i];
 236                 if (v->major <= major) {
 237                         ret = v;
 238                         break;
 239                 }
 240         }
 241         return ret;
 242 }
 243
 244 static int process_ver_info(struct vio_driver_state *vio,
 245                             struct vio_ver_info *pkt)
 246 {
 247         struct vio_version *vap;
 248         int err;
 249
 250         viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
 251                pkt->major, pkt->minor, pkt->dev_class);
 252
 253         if (vio->hs_state != VIO_HS_INVALID) {
 254                 /* XXX Perhaps invoke start_handshake? XXX */
 255                 memset(&vio->ver, 0, sizeof(vio->ver));
 256                 vio->hs_state = VIO_HS_INVALID;
 257         }
 258
 259         vap = find_by_major(vio, pkt->major);
 260
 261         vio->_peer_sid = pkt->tag.sid;
 262
 263         if (!vap) {
 264                 pkt->tag.stype = VIO_SUBTYPE_NACK;
 265                 pkt->major = 0;
 266                 pkt->minor = 0;
 267                 viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
 268                 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
 269         } else if (vap->major != pkt->major) {
 270                 pkt->tag.stype = VIO_SUBTYPE_NACK;
 271                 pkt->major = vap->major;
 272                 pkt->minor = vap->minor;
 273                 viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
 274                        pkt->major, pkt->minor);
 275                 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
 276         } else {
 277                 struct vio_version ver = {
 278                         .major = pkt->major,
 279                         .minor = pkt->minor,
 280                 };
 281                 if (ver.minor > vap->minor)
 282                         ver.minor = vap->minor;
 283                 pkt->minor = ver.minor;
 284                 pkt->tag.stype = VIO_SUBTYPE_ACK;
 285                 viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
 286                        pkt->major, pkt->minor);
 287                 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
 288                 if (err > 0) {
 289                         vio->ver = ver;
 290                         vio->hs_state = VIO_HS_GOTVERS;
 291                 }
 292         }
 293         if (err < 0)
 294                 return handshake_failure(vio);
 295
 296         return 0;
 297 }
 298
 299 static int process_ver_ack(struct vio_driver_state *vio,
 300                            struct vio_ver_info *pkt)
 301 {
 302         viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
 303                pkt->major, pkt->minor, pkt->dev_class);
 304
 305         if (vio->hs_state & VIO_HS_GOTVERS) {
 306                 if (vio->ver.major != pkt->major ||
 307                     vio->ver.minor != pkt->minor) {
 308                         pkt->tag.stype = VIO_SUBTYPE_NACK;
 309                         (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
 310                         return handshake_failure(vio);
 311                 }
 312         } else {
 313                 vio->ver.major = pkt->major;
 314                 vio->ver.minor = pkt->minor;
 315                 vio->hs_state = VIO_HS_GOTVERS;
 316         }
 317
 318         switch (vio->dev_class) {
 319         case VDEV_NETWORK:
 320         case VDEV_DISK:
 321                 if (send_attr(vio) < 0)
 322                         return handshake_failure(vio);
 323                 break;
 324
 325         default:
 326                 break;
 327         }
 328
 329         return 0;
 330 }
 331
 332 static int process_ver_nack(struct vio_driver_state *vio,
 333                             struct vio_ver_info *pkt)
 334 {
 335         struct vio_version *nver;
 336
 337         viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
 338                pkt->major, pkt->minor, pkt->dev_class);
 339
 340         if ((pkt->major == 0 && pkt->minor == 0) ||
 341             !(nver = find_by_major(vio, pkt->major)))
 342                 return handshake_failure(vio);
 343
 344         if (send_version(vio, nver->major, nver->minor) < 0)
 345                 return handshake_failure(vio);
 346
 347         return 0;
 348 }
 349
 350 static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt)
 351 {
 352         switch (pkt->tag.stype) {
 353         case VIO_SUBTYPE_INFO:
 354                 return process_ver_info(vio, pkt);
 355
 356         case VIO_SUBTYPE_ACK:
 357                 return process_ver_ack(vio, pkt);
 358
 359         case VIO_SUBTYPE_NACK:
 360                 return process_ver_nack(vio, pkt);
 361
 362         default:
 363                 return handshake_failure(vio);
 364         };
 365 }
 366
 367 static int process_attr(struct vio_driver_state *vio, void *pkt)
 368 {
 369         int err;
 370
 371         if (!(vio->hs_state & VIO_HS_GOTVERS))
 372                 return handshake_failure(vio);
 373
 374         err = vio->ops->handle_attr(vio, pkt);
 375         if (err < 0) {
 376                 return handshake_failure(vio);
 377         } else {
 378                 vio->hs_state |= VIO_HS_GOT_ATTR;
 379
 380                 if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
 381                     !(vio->hs_state & VIO_HS_SENT_DREG)) {
 382                         if (send_dreg(vio) < 0)
 383                                 return handshake_failure(vio);
 384
 385                         vio->hs_state |= VIO_HS_SENT_DREG;
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 static int all_drings_registered(struct vio_driver_state *vio)
 392 {
 393         int need_rx, need_tx;
 394
 395         need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ);
 396         need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);
 397
 398         if (need_rx &&
 399             !(vio->dr_state & VIO_DR_STATE_RXREG))
 400                 return 0;
 401
 402         if (need_tx &&
 403             !(vio->dr_state & VIO_DR_STATE_TXREG))
 404                 return 0;
 405
 406         return 1;
 407 }
 408
 409 static int process_dreg_info(struct vio_driver_state *vio,
 410                              struct vio_dring_register *pkt)
 411 {
 412         struct vio_dring_state *dr;
 413         int i, len;
 414
 415         viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
 416                "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
 417                (unsigned long long) pkt->dring_ident,
 418                pkt->num_descr, pkt->descr_size, pkt->options,
 419                pkt->num_cookies);
 420
 421         if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
 422                 goto send_nack;
 423
 424         if (vio->dr_state & VIO_DR_STATE_RXREG)
 425                 goto send_nack;
 426
 427         BUG_ON(vio->desc_buf);
 428
 429         vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
 430         if (!vio->desc_buf)
 431                 goto send_nack;
 432
 433         vio->desc_buf_len = pkt->descr_size;
 434
 435         dr = &vio->drings[VIO_DRIVER_RX_RING];
 436
 437         dr->num_entries = pkt->num_descr;
 438         dr->entry_size = pkt->descr_size;
 439         dr->ncookies = pkt->num_cookies;
 440         for (i = 0; i < dr->ncookies; i++) {
 441                 dr->cookies[i] = pkt->cookies[i];
 442
 443                 viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
 444                        i,
 445                        (unsigned long long)
 446                        pkt->cookies[i].cookie_addr,
 447                        (unsigned long long)
 448                        pkt->cookies[i].cookie_size);
 449         }
 450
 451         pkt->tag.stype = VIO_SUBTYPE_ACK;
 452         pkt->dring_ident = ++dr->ident;
 453
 454         viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n",
 455                (unsigned long long) pkt->dring_ident);
 456
 457         len = (sizeof(*pkt) +
 458                (dr->ncookies * sizeof(struct ldc_trans_cookie)));
 459         if (send_ctrl(vio, &pkt->tag, len) < 0)
 460                 goto send_nack;
 461
 462         vio->dr_state |= VIO_DR_STATE_RXREG;
 463
 464         return 0;
 465
 466 send_nack:
 467         pkt->tag.stype = VIO_SUBTYPE_NACK;
 468         viodbg(HS, "SEND DRING_REG NACK\n");
 469         (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
 470
 471         return handshake_failure(vio);
 472 }
 473
 474 static int process_dreg_ack(struct vio_driver_state *vio,
 475                             struct vio_dring_register *pkt)
 476 {
 477         struct vio_dring_state *dr;
 478
 479         viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
 480                "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
 481                (unsigned long long) pkt->dring_ident,
 482                pkt->num_descr, pkt->descr_size, pkt->options,
 483                pkt->num_cookies);
 484
 485         dr = &vio->drings[VIO_DRIVER_TX_RING];
 486
 487         if (!(vio->dr_state & VIO_DR_STATE_TXREQ))
 488                 return handshake_failure(vio);
 489
 490         dr->ident = pkt->dring_ident;
 491         vio->dr_state |= VIO_DR_STATE_TXREG;
 492
 493         if (all_drings_registered(vio)) {
 494                 if (send_rdx(vio) < 0)
 495                         return handshake_failure(vio);
 496                 vio->hs_state = VIO_HS_SENT_RDX;
 497         }
 498         return 0;
 499 }
 500
 501 static int process_dreg_nack(struct vio_driver_state *vio,
 502                              struct vio_dring_register *pkt)
 503 {
 504         viodbg(HS, "GOT DRING_REG NACK ident[%llx] "
 505                "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
 506                (unsigned long long) pkt->dring_ident,
 507                pkt->num_descr, pkt->descr_size, pkt->options,
 508                pkt->num_cookies);
 509
 510         return handshake_failure(vio);
 511 }
 512
 513 static int process_dreg(struct vio_driver_state *vio,
 514                         struct vio_dring_register *pkt)
 515 {
 516         if (!(vio->hs_state & VIO_HS_GOTVERS))
 517                 return handshake_failure(vio);
 518
 519         switch (pkt->tag.stype) {
 520         case VIO_SUBTYPE_INFO:
 521                 return process_dreg_info(vio, pkt);
 522
 523         case VIO_SUBTYPE_ACK:
 524                 return process_dreg_ack(vio, pkt);
 525
 526         case VIO_SUBTYPE_NACK:
 527                 return process_dreg_nack(vio, pkt);
 528
 529         default:
 530                 return handshake_failure(vio);
 531         }
 532 }
 533
 534 static int process_dunreg(struct vio_driver_state *vio,
 535                           struct vio_dring_unregister *pkt)
 536 {
 537         struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING];
 538
 539         viodbg(HS, "GOT DRING_UNREG\n");
 540
 541         if (pkt->dring_ident != dr->ident)
 542                 return 0;
 543
 544         vio->dr_state &= ~VIO_DR_STATE_RXREG;
 545
 546         memset(dr, 0, sizeof(*dr));
 547
 548         kfree(vio->desc_buf);
 549         vio->desc_buf = NULL;
 550         vio->desc_buf_len = 0;
 551
 552         return 0;
 553 }
 554
 555 static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt)
 556 {
 557         viodbg(HS, "GOT RDX INFO\n");
 558
 559         pkt->tag.stype = VIO_SUBTYPE_ACK;
 560         viodbg(HS, "SEND RDX ACK\n");
 561         if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0)
 562                 return handshake_failure(vio);
 563
 564         vio->hs_state |= VIO_HS_SENT_RDX_ACK;
 565         return 0;
 566 }
 567
 568 static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt)
 569 {
 570         viodbg(HS, "GOT RDX ACK\n");
 571
 572         if (!(vio->hs_state & VIO_HS_SENT_RDX))
 573                 return handshake_failure(vio);
 574
 575         vio->hs_state |= VIO_HS_GOT_RDX_ACK;
 576         return 0;
 577 }
 578
 579 static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt)
 580 {
 581         viodbg(HS, "GOT RDX NACK\n");
 582
 583         return handshake_failure(vio);
 584 }
 585
 586 static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt)
 587 {
 588         if (!all_drings_registered(vio))
 589                 handshake_failure(vio);
 590
 591         switch (pkt->tag.stype) {
 592         case VIO_SUBTYPE_INFO:
 593                 return process_rdx_info(vio, pkt);
 594
 595         case VIO_SUBTYPE_ACK:
 596                 return process_rdx_ack(vio, pkt);
 597
 598         case VIO_SUBTYPE_NACK:
 599                 return process_rdx_nack(vio, pkt);
 600
 601         default:
 602                 return handshake_failure(vio);
 603         }
 604 }
 605
 606 int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt)
 607 {
 608         struct vio_msg_tag *tag = pkt;
 609         u8 prev_state = vio->hs_state;
 610         int err;
 611
 612         switch (tag->stype_env) {
 613         case VIO_VER_INFO:
 614                 err = process_ver(vio, pkt);
 615                 break;
 616
 617         case VIO_ATTR_INFO:
 618                 err = process_attr(vio, pkt);
 619                 break;
 620
 621         case VIO_DRING_REG:
 622                 err = process_dreg(vio, pkt);
 623                 break;
 624
 625         case VIO_DRING_UNREG:
 626                 err = process_dunreg(vio, pkt);
 627                 break;
 628
 629         case VIO_RDX:
 630                 err = process_rdx(vio, pkt);
 631                 break;
 632
 633         default:
 634                 err = process_unknown(vio, pkt);
 635                 break;
 636         }
 637         if (!err &&
 638             vio->hs_state != prev_state &&
 639             (vio->hs_state & VIO_HS_COMPLETE))
 640                 vio->ops->handshake_complete(vio);
 641
 642         return err;
 643 }
 644 EXPORT_SYMBOL(vio_control_pkt_engine);
 645
 646 void vio_conn_reset(struct vio_driver_state *vio)
 647 {
 648 }
 649 EXPORT_SYMBOL(vio_conn_reset);
 650
 651 /* The issue is that the Solaris virtual disk server just mirrors the
 652  * SID values it gets from the client peer.  So we work around that
 653  * here in vio_{validate,send}_sid() so that the drivers don't need
 654  * to be aware of this crap.
 655  */
 656 int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp)
 657 {
 658         u32 sid;
 659
 660         /* Always let VERSION+INFO packets through unchecked, they
 661          * define the new SID.
 662          */
 663         if (tp->type == VIO_TYPE_CTRL &&
 664             tp->stype == VIO_SUBTYPE_INFO &&
 665             tp->stype_env == VIO_VER_INFO)
 666                 return 0;
 667
 668         /* Ok, now figure out which SID to use.  */
 669         switch (vio->dev_class) {
 670         case VDEV_NETWORK:
 671         case VDEV_NETWORK_SWITCH:
 672         case VDEV_DISK_SERVER:
 673         default:
 674                 sid = vio->_peer_sid;
 675                 break;
 676
 677         case VDEV_DISK:
 678                 sid = vio->_local_sid;
 679                 break;
 680         }
 681
 682         if (sid == tp->sid)
 683                 return 0;
 684         viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n",
 685                tp->sid, vio->_peer_sid, vio->_local_sid);
 686         return -EINVAL;
 687 }
 688 EXPORT_SYMBOL(vio_validate_sid);
 689
 690 u32 vio_send_sid(struct vio_driver_state *vio)
 691 {
 692         switch (vio->dev_class) {
 693         case VDEV_NETWORK:
 694         case VDEV_NETWORK_SWITCH:
 695         case VDEV_DISK:
 696         default:
 697                 return vio->_local_sid;
 698
 699         case VDEV_DISK_SERVER:
 700                 return vio->_peer_sid;
 701         }
 702 }
 703 EXPORT_SYMBOL(vio_send_sid);
 704
 705 int vio_ldc_alloc(struct vio_driver_state *vio,
 706                          struct ldc_channel_config *base_cfg,
 707                          void *event_arg)
 708 {
 709         struct ldc_channel_config cfg = *base_cfg;
 710         struct ldc_channel *lp;
 711
 712         cfg.tx_irq = vio->vdev->tx_irq;
 713         cfg.rx_irq = vio->vdev->rx_irq;
 714
 715         lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg);
 716         if (IS_ERR(lp))
 717                 return PTR_ERR(lp);
 718
 719         vio->lp = lp;
 720
 721         return 0;
 722 }
 723 EXPORT_SYMBOL(vio_ldc_alloc);
 724
 725 void vio_ldc_free(struct vio_driver_state *vio)
 726 {
 727         ldc_free(vio->lp);
 728         vio->lp = NULL;
 729
 730         kfree(vio->desc_buf);
 731         vio->desc_buf = NULL;
 732         vio->desc_buf_len = 0;
 733 }
 734 EXPORT_SYMBOL(vio_ldc_free);
 735
 736 void vio_port_up(struct vio_driver_state *vio)
 737 {
 738         unsigned long flags;
 739         int err, state;
 740
 741         spin_lock_irqsave(&vio->lock, flags);
 742
 743         state = ldc_state(vio->lp);
 744
 745         err = 0;
 746         if (state == LDC_STATE_INIT) {
 747                 err = ldc_bind(vio->lp, vio->name);
 748                 if (err)
 749                         printk(KERN_WARNING "%s: Port %lu bind failed, "
 750                                "err=%d\n",
 751                                vio->name, vio->vdev->channel_id, err);
 752         }
 753
 754         if (!err) {
 755                 err = ldc_connect(vio->lp);
 756                 if (err)
 757                         printk(KERN_WARNING "%s: Port %lu connect failed, "
 758                                "err=%d\n",
 759                                vio->name, vio->vdev->channel_id, err);
 760         }
 761         if (err) {
 762                 unsigned long expires = jiffies + HZ;
 763
 764                 expires = round_jiffies(expires);
 765                 mod_timer(&vio->timer, expires);
 766         }
 767
 768         spin_unlock_irqrestore(&vio->lock, flags);
 769 }
 770 EXPORT_SYMBOL(vio_port_up);
 771
 772 static void vio_port_timer(unsigned long _arg)
 773 {
 774         struct vio_driver_state *vio = (struct vio_driver_state *) _arg;
 775
 776         vio_port_up(vio);
 777 }
 778
 779 int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
 780                     u8 dev_class, struct vio_version *ver_table,
 781                     int ver_table_size, struct vio_driver_ops *ops,
 782                     char *name)
 783 {
 784         switch (dev_class) {
 785         case VDEV_NETWORK:
 786         case VDEV_NETWORK_SWITCH:
 787         case VDEV_DISK:
 788         case VDEV_DISK_SERVER:
 789                 break;
 790
 791         default:
 792                 return -EINVAL;
 793         }
 794
 795         if (!ops->send_attr ||
 796             !ops->handle_attr ||
 797             !ops->handshake_complete)
 798                 return -EINVAL;
 799
 800         if (!ver_table || ver_table_size < 0)
 801                 return -EINVAL;
 802
 803         if (!name)
 804                 return -EINVAL;
 805
 806         spin_lock_init(&vio->lock);
 807
 808         vio->name = name;
 809
 810         vio->dev_class = dev_class;
 811         vio->vdev = vdev;
 812
 813         vio->ver_table = ver_table;
 814         vio->ver_table_entries = ver_table_size;
 815
 816         vio->ops = ops;
 817
 818         setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio);
 819
 820         return 0;
 821 }
 822 EXPORT_SYMBOL(vio_driver_init);