drivers/scsi/libsas/sas_expander.c

   1 /*
   2  * Serial Attached SCSI (SAS) Expander discovery and configuration
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22  *
  23  */
  24
  25 #include <linux/scatterlist.h>
  26 #include <linux/blkdev.h>
  27
  28 #include "sas_internal.h"
  29
  30 #include <scsi/scsi_transport.h>
  31 #include <scsi/scsi_transport_sas.h>
  32 #include "../scsi_sas_internal.h"
  33
  34 static int sas_discover_expander(struct domain_device *dev);
  35 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  36 static int sas_configure_phy(struct domain_device *dev, int phy_id,
  37                              u8 *sas_addr, int include);
  38 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  39
  40 /* ---------- SMP task management ---------- */
  41
  42 static void smp_task_timedout(unsigned long _task)
  43 {
  44         struct sas_task *task = (void *) _task;
  45         unsigned long flags;
  46
  47         spin_lock_irqsave(&task->task_state_lock, flags);
  48         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  49                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  50         spin_unlock_irqrestore(&task->task_state_lock, flags);
  51
  52         complete(&task->completion);
  53 }
  54
  55 static void smp_task_done(struct sas_task *task)
  56 {
  57         if (!del_timer(&task->timer))
  58                 return;
  59         complete(&task->completion);
  60 }
  61
  62 /* Give it some long enough timeout. In seconds. */
  63 #define SMP_TIMEOUT 10
  64
  65 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
  66                             void *resp, int resp_size)
  67 {
  68         int res, retry;
  69         struct sas_task *task = NULL;
  70         struct sas_internal *i =
  71                 to_sas_internal(dev->port->ha->core.shost->transportt);
  72
  73         for (retry = 0; retry < 3; retry++) {
  74                 task = sas_alloc_task(GFP_KERNEL);
  75                 if (!task)
  76                         return -ENOMEM;
  77
  78                 task->dev = dev;
  79                 task->task_proto = dev->tproto;
  80                 sg_init_one(&task->smp_task.smp_req, req, req_size);
  81                 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  82
  83                 task->task_done = smp_task_done;
  84
  85                 task->timer.data = (unsigned long) task;
  86                 task->timer.function = smp_task_timedout;
  87                 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  88                 add_timer(&task->timer);
  89
  90                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  91
  92                 if (res) {
  93                         del_timer(&task->timer);
  94                         SAS_DPRINTK("executing SMP task failed:%d\n", res);
  95                         goto ex_err;
  96                 }
  97
  98                 wait_for_completion(&task->completion);
  99                 res = -ETASK;
 100                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 101                         SAS_DPRINTK("smp task timed out or aborted\n");
 102                         i->dft->lldd_abort_task(task);
 103                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 104                                 SAS_DPRINTK("SMP task aborted and not done\n");
 105                                 goto ex_err;
 106                         }
 107                 }
 108                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 109                     task->task_status.stat == SAM_GOOD) {
 110                         res = 0;
 111                         break;
 112                 } else {
 113                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 114                                     "status 0x%x\n", __FUNCTION__,
 115                                     SAS_ADDR(dev->sas_addr),
 116                                     task->task_status.resp,
 117                                     task->task_status.stat);
 118                         sas_free_task(task);
 119                         task = NULL;
 120                 }
 121         }
 122 ex_err:
 123         BUG_ON(retry == 3 && task != NULL);
 124         if (task != NULL) {
 125                 sas_free_task(task);
 126         }
 127         return res;
 128 }
 129
 130 /* ---------- Allocations ---------- */
 131
 132 static inline void *alloc_smp_req(int size)
 133 {
 134         u8 *p = kzalloc(size, GFP_KERNEL);
 135         if (p)
 136                 p[0] = SMP_REQUEST;
 137         return p;
 138 }
 139
 140 static inline void *alloc_smp_resp(int size)
 141 {
 142         return kzalloc(size, GFP_KERNEL);
 143 }
 144
 145 /* ---------- Expander configuration ---------- */
 146
 147 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 148                            void *disc_resp)
 149 {
 150         struct expander_device *ex = &dev->ex_dev;
 151         struct ex_phy *phy = &ex->ex_phy[phy_id];
 152         struct smp_resp *resp = disc_resp;
 153         struct discover_resp *dr = &resp->disc;
 154         struct sas_rphy *rphy = dev->rphy;
 155         int rediscover = (phy->phy != NULL);
 156
 157         if (!rediscover) {
 158                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 159
 160                 /* FIXME: error_handling */
 161                 BUG_ON(!phy->phy);
 162         }
 163
 164         switch (resp->result) {
 165         case SMP_RESP_PHY_VACANT:
 166                 phy->phy_state = PHY_VACANT;
 167                 return;
 168         default:
 169                 phy->phy_state = PHY_NOT_PRESENT;
 170                 return;
 171         case SMP_RESP_FUNC_ACC:
 172                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 173                 break;
 174         }
 175
 176         phy->phy_id = phy_id;
 177         phy->attached_dev_type = dr->attached_dev_type;
 178         phy->linkrate = dr->linkrate;
 179         phy->attached_sata_host = dr->attached_sata_host;
 180         phy->attached_sata_dev  = dr->attached_sata_dev;
 181         phy->attached_sata_ps   = dr->attached_sata_ps;
 182         phy->attached_iproto = dr->iproto << 1;
 183         phy->attached_tproto = dr->tproto << 1;
 184         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 185         phy->attached_phy_id = dr->attached_phy_id;
 186         phy->phy_change_count = dr->change_count;
 187         phy->routing_attr = dr->routing_attr;
 188         phy->virtual = dr->virtual;
 189         phy->last_da_index = -1;
 190
 191         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 192         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 193         phy->phy->identify.phy_identifier = phy_id;
 194         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 195         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 196         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 197         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 198         phy->phy->negotiated_linkrate = phy->linkrate;
 199
 200         if (!rediscover)
 201                 sas_phy_add(phy->phy);
 202
 203         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 204                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 205                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 206                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 207                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 208                     SAS_ADDR(phy->attached_sas_addr));
 209
 210         return;
 211 }
 212
 213 #define DISCOVER_REQ_SIZE  16
 214 #define DISCOVER_RESP_SIZE 56
 215
 216 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 217                                       u8 *disc_resp, int single)
 218 {
 219         int i, res;
 220
 221         disc_req[9] = single;
 222         for (i = 1 ; i < 3; i++) {
 223                 struct discover_resp *dr;
 224
 225                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 226                                        disc_resp, DISCOVER_RESP_SIZE);
 227                 if (res)
 228                         return res;
 229                 /* This is detecting a failure to transmit inital
 230                  * dev to host FIS as described in section G.5 of
 231                  * sas-2 r 04b */
 232                 dr = &((struct smp_resp *)disc_resp)->disc;
 233                 if (!(dr->attached_dev_type == 0 &&
 234                       dr->attached_sata_dev))
 235                         break;
 236                 /* In order to generate the dev to host FIS, we
 237                  * send a link reset to the expander port */
 238                 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
 239                 /* Wait for the reset to trigger the negotiation */
 240                 msleep(500);
 241         }
 242         sas_set_ex_phy(dev, single, disc_resp);
 243         return 0;
 244 }
 245
 246 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 247 {
 248         struct expander_device *ex = &dev->ex_dev;
 249         int  res = 0;
 250         u8   *disc_req;
 251         u8   *disc_resp;
 252
 253         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 254         if (!disc_req)
 255                 return -ENOMEM;
 256
 257         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 258         if (!disc_resp) {
 259                 kfree(disc_req);
 260                 return -ENOMEM;
 261         }
 262
 263         disc_req[1] = SMP_DISCOVER;
 264
 265         if (0 <= single && single < ex->num_phys) {
 266                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 267         } else {
 268                 int i;
 269
 270                 for (i = 0; i < ex->num_phys; i++) {
 271                         res = sas_ex_phy_discover_helper(dev, disc_req,
 272                                                          disc_resp, i);
 273                         if (res)
 274                                 goto out_err;
 275                 }
 276         }
 277 out_err:
 278         kfree(disc_resp);
 279         kfree(disc_req);
 280         return res;
 281 }
 282
 283 static int sas_expander_discover(struct domain_device *dev)
 284 {
 285         struct expander_device *ex = &dev->ex_dev;
 286         int res = -ENOMEM;
 287
 288         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 289         if (!ex->ex_phy)
 290                 return -ENOMEM;
 291
 292         res = sas_ex_phy_discover(dev, -1);
 293         if (res)
 294                 goto out_err;
 295
 296         return 0;
 297  out_err:
 298         kfree(ex->ex_phy);
 299         ex->ex_phy = NULL;
 300         return res;
 301 }
 302
 303 #define MAX_EXPANDER_PHYS 128
 304
 305 static void ex_assign_report_general(struct domain_device *dev,
 306                                             struct smp_resp *resp)
 307 {
 308         struct report_general_resp *rg = &resp->rg;
 309
 310         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 311         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 312         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 313         dev->ex_dev.conf_route_table = rg->conf_route_table;
 314         dev->ex_dev.configuring = rg->configuring;
 315         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 316 }
 317
 318 #define RG_REQ_SIZE   8
 319 #define RG_RESP_SIZE 32
 320
 321 static int sas_ex_general(struct domain_device *dev)
 322 {
 323         u8 *rg_req;
 324         struct smp_resp *rg_resp;
 325         int res;
 326         int i;
 327
 328         rg_req = alloc_smp_req(RG_REQ_SIZE);
 329         if (!rg_req)
 330                 return -ENOMEM;
 331
 332         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 333         if (!rg_resp) {
 334                 kfree(rg_req);
 335                 return -ENOMEM;
 336         }
 337
 338         rg_req[1] = SMP_REPORT_GENERAL;
 339
 340         for (i = 0; i < 5; i++) {
 341                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 342                                        RG_RESP_SIZE);
 343
 344                 if (res) {
 345                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 346                                     SAS_ADDR(dev->sas_addr), res);
 347                         goto out;
 348                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 349                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 350                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 351                         res = rg_resp->result;
 352                         goto out;
 353                 }
 354
 355                 ex_assign_report_general(dev, rg_resp);
 356
 357                 if (dev->ex_dev.configuring) {
 358                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 359                                     SAS_ADDR(dev->sas_addr));
 360                         schedule_timeout_interruptible(5*HZ);
 361                 } else
 362                         break;
 363         }
 364 out:
 365         kfree(rg_req);
 366         kfree(rg_resp);
 367         return res;
 368 }
 369
 370 static void ex_assign_manuf_info(struct domain_device *dev, void
 371                                         *_mi_resp)
 372 {
 373         u8 *mi_resp = _mi_resp;
 374         struct sas_rphy *rphy = dev->rphy;
 375         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 376
 377         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 378         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 379         memcpy(edev->product_rev, mi_resp + 36,
 380                SAS_EXPANDER_PRODUCT_REV_LEN);
 381
 382         if (mi_resp[8] & 1) {
 383                 memcpy(edev->component_vendor_id, mi_resp + 40,
 384                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 385                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 386                 edev->component_revision_id = mi_resp[50];
 387         }
 388 }
 389
 390 #define MI_REQ_SIZE   8
 391 #define MI_RESP_SIZE 64
 392
 393 static int sas_ex_manuf_info(struct domain_device *dev)
 394 {
 395         u8 *mi_req;
 396         u8 *mi_resp;
 397         int res;
 398
 399         mi_req = alloc_smp_req(MI_REQ_SIZE);
 400         if (!mi_req)
 401                 return -ENOMEM;
 402
 403         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 404         if (!mi_resp) {
 405                 kfree(mi_req);
 406                 return -ENOMEM;
 407         }
 408
 409         mi_req[1] = SMP_REPORT_MANUF_INFO;
 410
 411         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 412         if (res) {
 413                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 414                             SAS_ADDR(dev->sas_addr), res);
 415                 goto out;
 416         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 417                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 418                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 419                 goto out;
 420         }
 421
 422         ex_assign_manuf_info(dev, mi_resp);
 423 out:
 424         kfree(mi_req);
 425         kfree(mi_resp);
 426         return res;
 427 }
 428
 429 #define PC_REQ_SIZE  44
 430 #define PC_RESP_SIZE 8
 431
 432 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 433                         enum phy_func phy_func,
 434                         struct sas_phy_linkrates *rates)
 435 {
 436         u8 *pc_req;
 437         u8 *pc_resp;
 438         int res;
 439
 440         pc_req = alloc_smp_req(PC_REQ_SIZE);
 441         if (!pc_req)
 442                 return -ENOMEM;
 443
 444         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 445         if (!pc_resp) {
 446                 kfree(pc_req);
 447                 return -ENOMEM;
 448         }
 449
 450         pc_req[1] = SMP_PHY_CONTROL;
 451         pc_req[9] = phy_id;
 452         pc_req[10]= phy_func;
 453         if (rates) {
 454                 pc_req[32] = rates->minimum_linkrate << 4;
 455                 pc_req[33] = rates->maximum_linkrate << 4;
 456         }
 457
 458         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 459
 460         kfree(pc_resp);
 461         kfree(pc_req);
 462         return res;
 463 }
 464
 465 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 466 {
 467         struct expander_device *ex = &dev->ex_dev;
 468         struct ex_phy *phy = &ex->ex_phy[phy_id];
 469
 470         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 471         phy->linkrate = SAS_PHY_DISABLED;
 472 }
 473
 474 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 475 {
 476         struct expander_device *ex = &dev->ex_dev;
 477         int i;
 478
 479         for (i = 0; i < ex->num_phys; i++) {
 480                 struct ex_phy *phy = &ex->ex_phy[i];
 481
 482                 if (phy->phy_state == PHY_VACANT ||
 483                     phy->phy_state == PHY_NOT_PRESENT)
 484                         continue;
 485
 486                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 487                         sas_ex_disable_phy(dev, i);
 488         }
 489 }
 490
 491 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 492                                             u8 *sas_addr)
 493 {
 494         struct domain_device *dev;
 495
 496         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 497                 return 1;
 498         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 499                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 500                         return 1;
 501         }
 502         return 0;
 503 }
 504
 505 #define RPEL_REQ_SIZE   16
 506 #define RPEL_RESP_SIZE  32
 507 int sas_smp_get_phy_events(struct sas_phy *phy)
 508 {
 509         int res;
 510         u8 *req;
 511         u8 *resp;
 512         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 513         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 514
 515         req = alloc_smp_req(RPEL_REQ_SIZE);
 516         if (!req)
 517                 return -ENOMEM;
 518
 519         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 520         if (!resp) {
 521                 kfree(req);
 522                 return -ENOMEM;
 523         }
 524
 525         req[1] = SMP_REPORT_PHY_ERR_LOG;
 526         req[9] = phy->number;
 527
 528         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 529                                     resp, RPEL_RESP_SIZE);
 530
 531         if (!res)
 532                 goto out;
 533
 534         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 535         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 536         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 537         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 538
 539  out:
 540         kfree(resp);
 541         return res;
 542
 543 }
 544
 545 #ifdef CONFIG_SCSI_SAS_ATA
 546
 547 #define RPS_REQ_SIZE  16
 548 #define RPS_RESP_SIZE 60
 549
 550 static int sas_get_report_phy_sata(struct domain_device *dev,
 551                                           int phy_id,
 552                                           struct smp_resp *rps_resp)
 553 {
 554         int res;
 555         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 556         u8 *resp = (u8 *)rps_resp;
 557
 558         if (!rps_req)
 559                 return -ENOMEM;
 560
 561         rps_req[1] = SMP_REPORT_PHY_SATA;
 562         rps_req[9] = phy_id;
 563
 564         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 565                                     rps_resp, RPS_RESP_SIZE);
 566
 567         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 568          * standards cockup here.  sas-2 explicitly specifies the FIS
 569          * should be encoded so that FIS type is in resp[24].
 570          * However, some expanders endian reverse this.  Undo the
 571          * reversal here */
 572         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 573                 int i;
 574
 575                 for (i = 0; i < 5; i++) {
 576                         int j = 24 + (i*4);
 577                         u8 a, b;
 578                         a = resp[j + 0];
 579                         b = resp[j + 1];
 580                         resp[j + 0] = resp[j + 3];
 581                         resp[j + 1] = resp[j + 2];
 582                         resp[j + 2] = b;
 583                         resp[j + 3] = a;
 584                 }
 585         }
 586
 587         kfree(rps_req);
 588         return res;
 589 }
 590 #endif
 591
 592 static void sas_ex_get_linkrate(struct domain_device *parent,
 593                                        struct domain_device *child,
 594                                        struct ex_phy *parent_phy)
 595 {
 596         struct expander_device *parent_ex = &parent->ex_dev;
 597         struct sas_port *port;
 598         int i;
 599
 600         child->pathways = 0;
 601
 602         port = parent_phy->port;
 603
 604         for (i = 0; i < parent_ex->num_phys; i++) {
 605                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 606
 607                 if (phy->phy_state == PHY_VACANT ||
 608                     phy->phy_state == PHY_NOT_PRESENT)
 609                         continue;
 610
 611                 if (SAS_ADDR(phy->attached_sas_addr) ==
 612                     SAS_ADDR(child->sas_addr)) {
 613
 614                         child->min_linkrate = min(parent->min_linkrate,
 615                                                   phy->linkrate);
 616                         child->max_linkrate = max(parent->max_linkrate,
 617                                                   phy->linkrate);
 618                         child->pathways++;
 619                         sas_port_add_phy(port, phy->phy);
 620                 }
 621         }
 622         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 623         child->pathways = min(child->pathways, parent->pathways);
 624 }
 625
 626 static struct domain_device *sas_ex_discover_end_dev(
 627         struct domain_device *parent, int phy_id)
 628 {
 629         struct expander_device *parent_ex = &parent->ex_dev;
 630         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 631         struct domain_device *child = NULL;
 632         struct sas_rphy *rphy;
 633         int res;
 634
 635         if (phy->attached_sata_host || phy->attached_sata_ps)
 636                 return NULL;
 637
 638         child = kzalloc(sizeof(*child), GFP_KERNEL);
 639         if (!child)
 640                 return NULL;
 641
 642         child->parent = parent;
 643         child->port   = parent->port;
 644         child->iproto = phy->attached_iproto;
 645         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 646         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 647         if (!phy->port) {
 648                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 649                 if (unlikely(!phy->port))
 650                         goto out_err;
 651                 if (unlikely(sas_port_add(phy->port) != 0)) {
 652                         sas_port_free(phy->port);
 653                         goto out_err;
 654                 }
 655         }
 656         sas_ex_get_linkrate(parent, child, phy);
 657
 658 #ifdef CONFIG_SCSI_SAS_ATA
 659         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 660                 child->dev_type = SATA_DEV;
 661                 if (phy->attached_tproto & SAS_PROTO_STP)
 662                         child->tproto = phy->attached_tproto;
 663                 if (phy->attached_sata_dev)
 664                         child->tproto |= SATA_DEV;
 665                 res = sas_get_report_phy_sata(parent, phy_id,
 666                                               &child->sata_dev.rps_resp);
 667                 if (res) {
 668                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 669                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 670                                     phy_id, res);
 671                         goto out_free;
 672                 }
 673                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 674                        sizeof(struct dev_to_host_fis));
 675
 676                 rphy = sas_end_device_alloc(phy->port);
 677                 if (unlikely(!rphy))
 678                         goto out_free;
 679
 680                 sas_init_dev(child);
 681
 682                 child->rphy = rphy;
 683
 684                 spin_lock_irq(&parent->port->dev_list_lock);
 685                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 686                 spin_unlock_irq(&parent->port->dev_list_lock);
 687
 688                 res = sas_discover_sata(child);
 689                 if (res) {
 690                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 691                                     "%016llx:0x%x returned 0x%x\n",
 692                                     SAS_ADDR(child->sas_addr),
 693                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 694                         goto out_list_del;
 695                 }
 696         } else
 697 #endif
 698           if (phy->attached_tproto & SAS_PROTO_SSP) {
 699                 child->dev_type = SAS_END_DEV;
 700                 rphy = sas_end_device_alloc(phy->port);
 701                 /* FIXME: error handling */
 702                 if (unlikely(!rphy))
 703                         goto out_free;
 704                 child->tproto = phy->attached_tproto;
 705                 sas_init_dev(child);
 706
 707                 child->rphy = rphy;
 708                 sas_fill_in_rphy(child, rphy);
 709
 710                 spin_lock_irq(&parent->port->dev_list_lock);
 711                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 712                 spin_unlock_irq(&parent->port->dev_list_lock);
 713
 714                 res = sas_discover_end_dev(child);
 715                 if (res) {
 716                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 717                                     "at %016llx:0x%x returned 0x%x\n",
 718                                     SAS_ADDR(child->sas_addr),
 719                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 720                         goto out_list_del;
 721                 }
 722         } else {
 723                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 724                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 725                             phy_id);
 726                 goto out_free;
 727         }
 728
 729         list_add_tail(&child->siblings, &parent_ex->children);
 730         return child;
 731
 732  out_list_del:
 733         sas_rphy_free(child->rphy);
 734         child->rphy = NULL;
 735         list_del(&child->dev_list_node);
 736  out_free:
 737         sas_port_delete(phy->port);
 738  out_err:
 739         phy->port = NULL;
 740         kfree(child);
 741         return NULL;
 742 }
 743
 744 /* See if this phy is part of a wide port */
 745 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 746 {
 747         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 748         int i;
 749
 750         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 751                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 752
 753                 if (ephy == phy)
 754                         continue;
 755
 756                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 757                             SAS_ADDR_SIZE) && ephy->port) {
 758                         sas_port_add_phy(ephy->port, phy->phy);
 759                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 760                         return 0;
 761                 }
 762         }
 763
 764         return -ENODEV;
 765 }
 766
 767 static struct domain_device *sas_ex_discover_expander(
 768         struct domain_device *parent, int phy_id)
 769 {
 770         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 771         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 772         struct domain_device *child = NULL;
 773         struct sas_rphy *rphy;
 774         struct sas_expander_device *edev;
 775         struct asd_sas_port *port;
 776         int res;
 777
 778         if (phy->routing_attr == DIRECT_ROUTING) {
 779                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 780                             "allowed\n",
 781                             SAS_ADDR(parent->sas_addr), phy_id,
 782                             SAS_ADDR(phy->attached_sas_addr),
 783                             phy->attached_phy_id);
 784                 return NULL;
 785         }
 786         child = kzalloc(sizeof(*child), GFP_KERNEL);
 787         if (!child)
 788                 return NULL;
 789
 790         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 791         /* FIXME: better error handling */
 792         BUG_ON(sas_port_add(phy->port) != 0);
 793
 794
 795         switch (phy->attached_dev_type) {
 796         case EDGE_DEV:
 797                 rphy = sas_expander_alloc(phy->port,
 798                                           SAS_EDGE_EXPANDER_DEVICE);
 799                 break;
 800         case FANOUT_DEV:
 801                 rphy = sas_expander_alloc(phy->port,
 802                                           SAS_FANOUT_EXPANDER_DEVICE);
 803                 break;
 804         default:
 805                 rphy = NULL;    /* shut gcc up */
 806                 BUG();
 807         }
 808         port = parent->port;
 809         child->rphy = rphy;
 810         edev = rphy_to_expander_device(rphy);
 811         child->dev_type = phy->attached_dev_type;
 812         child->parent = parent;
 813         child->port = port;
 814         child->iproto = phy->attached_iproto;
 815         child->tproto = phy->attached_tproto;
 816         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 817         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 818         sas_ex_get_linkrate(parent, child, phy);
 819         edev->level = parent_ex->level + 1;
 820         parent->port->disc.max_level = max(parent->port->disc.max_level,
 821                                            edev->level);
 822         sas_init_dev(child);
 823         sas_fill_in_rphy(child, rphy);
 824         sas_rphy_add(rphy);
 825
 826         spin_lock_irq(&parent->port->dev_list_lock);
 827         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 828         spin_unlock_irq(&parent->port->dev_list_lock);
 829
 830         res = sas_discover_expander(child);
 831         if (res) {
 832                 kfree(child);
 833                 return NULL;
 834         }
 835         list_add_tail(&child->siblings, &parent->ex_dev.children);
 836         return child;
 837 }
 838
 839 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 840 {
 841         struct expander_device *ex = &dev->ex_dev;
 842         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 843         struct domain_device *child = NULL;
 844         int res = 0;
 845
 846         /* Phy state */
 847         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 848                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 849                         res = sas_ex_phy_discover(dev, phy_id);
 850                 if (res)
 851                         return res;
 852         }
 853
 854         /* Parent and domain coherency */
 855         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 856                              SAS_ADDR(dev->port->sas_addr))) {
 857                 sas_add_parent_port(dev, phy_id);
 858                 return 0;
 859         }
 860         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 861                             SAS_ADDR(dev->parent->sas_addr))) {
 862                 sas_add_parent_port(dev, phy_id);
 863                 if (ex_phy->routing_attr == TABLE_ROUTING)
 864                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 865                 return 0;
 866         }
 867
 868         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 869                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 870
 871         if (ex_phy->attached_dev_type == NO_DEVICE) {
 872                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 873                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 874                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 875                 }
 876                 return 0;
 877         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 878                 return 0;
 879
 880         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 881             ex_phy->attached_dev_type != FANOUT_DEV &&
 882             ex_phy->attached_dev_type != EDGE_DEV) {
 883                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 884                             "phy 0x%x\n", ex_phy->attached_dev_type,
 885                             SAS_ADDR(dev->sas_addr),
 886                             phy_id);
 887                 return 0;
 888         }
 889
 890         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 891         if (res) {
 892                 SAS_DPRINTK("configure routing for dev %016llx "
 893                             "reported 0x%x. Forgotten\n",
 894                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 895                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 896                 return res;
 897         }
 898
 899         res = sas_ex_join_wide_port(dev, phy_id);
 900         if (!res) {
 901                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 902                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 903                 return res;
 904         }
 905
 906         switch (ex_phy->attached_dev_type) {
 907         case SAS_END_DEV:
 908                 child = sas_ex_discover_end_dev(dev, phy_id);
 909                 break;
 910         case FANOUT_DEV:
 911                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 912                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 913                                     "attached to ex %016llx phy 0x%x\n",
 914                                     SAS_ADDR(ex_phy->attached_sas_addr),
 915                                     ex_phy->attached_phy_id,
 916                                     SAS_ADDR(dev->sas_addr),
 917                                     phy_id);
 918                         sas_ex_disable_phy(dev, phy_id);
 919                         break;
 920                 } else
 921                         memcpy(dev->port->disc.fanout_sas_addr,
 922                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 923                 /* fallthrough */
 924         case EDGE_DEV:
 925                 child = sas_ex_discover_expander(dev, phy_id);
 926                 break;
 927         default:
 928                 break;
 929         }
 930
 931         if (child) {
 932                 int i;
 933
 934                 for (i = 0; i < ex->num_phys; i++) {
 935                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 936                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 937                                 continue;
 938
 939                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 940                             SAS_ADDR(child->sas_addr))
 941                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 942                 }
 943         }
 944
 945         return res;
 946 }
 947
 948 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 949 {
 950         struct expander_device *ex = &dev->ex_dev;
 951         int i;
 952
 953         for (i = 0; i < ex->num_phys; i++) {
 954                 struct ex_phy *phy = &ex->ex_phy[i];
 955
 956                 if (phy->phy_state == PHY_VACANT ||
 957                     phy->phy_state == PHY_NOT_PRESENT)
 958                         continue;
 959
 960                 if ((phy->attached_dev_type == EDGE_DEV ||
 961                      phy->attached_dev_type == FANOUT_DEV) &&
 962                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 963
 964                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 965
 966                         return 1;
 967                 }
 968         }
 969         return 0;
 970 }
 971
 972 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 973 {
 974         struct expander_device *ex = &dev->ex_dev;
 975         struct domain_device *child;
 976         u8 sub_addr[8] = {0, };
 977
 978         list_for_each_entry(child, &ex->children, siblings) {
 979                 if (child->dev_type != EDGE_DEV &&
 980                     child->dev_type != FANOUT_DEV)
 981                         continue;
 982                 if (sub_addr[0] == 0) {
 983                         sas_find_sub_addr(child, sub_addr);
 984                         continue;
 985                 } else {
 986                         u8 s2[8];
 987
 988                         if (sas_find_sub_addr(child, s2) &&
 989                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 990
 991                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 992                                             "diverges from subtractive "
 993                                             "boundary %016llx\n",
 994                                             SAS_ADDR(dev->sas_addr),
 995                                             SAS_ADDR(child->sas_addr),
 996                                             SAS_ADDR(s2),
 997                                             SAS_ADDR(sub_addr));
 998
 999                                 sas_ex_disable_port(child, s2);
1000                         }
1001                 }
1002         }
1003         return 0;
1004 }
1005 /**
1006  * sas_ex_discover_devices -- discover devices attached to this expander
1007  * dev: pointer to the expander domain device
1008  * single: if you want to do a single phy, else set to -1;
1009  *
1010  * Configure this expander for use with its devices and register the
1011  * devices of this expander.
1012  */
1013 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1014 {
1015         struct expander_device *ex = &dev->ex_dev;
1016         int i = 0, end = ex->num_phys;
1017         int res = 0;
1018
1019         if (0 <= single && single < end) {
1020                 i = single;
1021                 end = i+1;
1022         }
1023
1024         for ( ; i < end; i++) {
1025                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1026
1027                 if (ex_phy->phy_state == PHY_VACANT ||
1028                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1029                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1030                         continue;
1031
1032                 switch (ex_phy->linkrate) {
1033                 case SAS_PHY_DISABLED:
1034                 case SAS_PHY_RESET_PROBLEM:
1035                 case SAS_SATA_PORT_SELECTOR:
1036                         continue;
1037                 default:
1038                         res = sas_ex_discover_dev(dev, i);
1039                         if (res)
1040                                 break;
1041                         continue;
1042                 }
1043         }
1044
1045         if (!res)
1046                 sas_check_level_subtractive_boundary(dev);
1047
1048         return res;
1049 }
1050
1051 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1052 {
1053         struct expander_device *ex = &dev->ex_dev;
1054         int i;
1055         u8  *sub_sas_addr = NULL;
1056
1057         if (dev->dev_type != EDGE_DEV)
1058                 return 0;
1059
1060         for (i = 0; i < ex->num_phys; i++) {
1061                 struct ex_phy *phy = &ex->ex_phy[i];
1062
1063                 if (phy->phy_state == PHY_VACANT ||
1064                     phy->phy_state == PHY_NOT_PRESENT)
1065                         continue;
1066
1067                 if ((phy->attached_dev_type == FANOUT_DEV ||
1068                      phy->attached_dev_type == EDGE_DEV) &&
1069                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1070
1071                         if (!sub_sas_addr)
1072                                 sub_sas_addr = &phy->attached_sas_addr[0];
1073                         else if (SAS_ADDR(sub_sas_addr) !=
1074                                  SAS_ADDR(phy->attached_sas_addr)) {
1075
1076                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1077                                             "diverges(%016llx) on subtractive "
1078                                             "boundary(%016llx). Disabled\n",
1079                                             SAS_ADDR(dev->sas_addr), i,
1080                                             SAS_ADDR(phy->attached_sas_addr),
1081                                             SAS_ADDR(sub_sas_addr));
1082                                 sas_ex_disable_phy(dev, i);
1083                         }
1084                 }
1085         }
1086         return 0;
1087 }
1088
1089 static void sas_print_parent_topology_bug(struct domain_device *child,
1090                                                  struct ex_phy *parent_phy,
1091                                                  struct ex_phy *child_phy)
1092 {
1093         static const char ra_char[] = {
1094                 [DIRECT_ROUTING] = 'D',
1095                 [SUBTRACTIVE_ROUTING] = 'S',
1096                 [TABLE_ROUTING] = 'T',
1097         };
1098         static const char *ex_type[] = {
1099                 [EDGE_DEV] = "edge",
1100                 [FANOUT_DEV] = "fanout",
1101         };
1102         struct domain_device *parent = child->parent;
1103
1104         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1105                    "has %c:%c routing link!\n",
1106
1107                    ex_type[parent->dev_type],
1108                    SAS_ADDR(parent->sas_addr),
1109                    parent_phy->phy_id,
1110
1111                    ex_type[child->dev_type],
1112                    SAS_ADDR(child->sas_addr),
1113                    child_phy->phy_id,
1114
1115                    ra_char[parent_phy->routing_attr],
1116                    ra_char[child_phy->routing_attr]);
1117 }
1118
1119 static int sas_check_eeds(struct domain_device *child,
1120                                  struct ex_phy *parent_phy,
1121                                  struct ex_phy *child_phy)
1122 {
1123         int res = 0;
1124         struct domain_device *parent = child->parent;
1125
1126         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1127                 res = -ENODEV;
1128                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1129                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1130                             SAS_ADDR(parent->sas_addr),
1131                             parent_phy->phy_id,
1132                             SAS_ADDR(child->sas_addr),
1133                             child_phy->phy_id,
1134                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1135         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1136                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1137                        SAS_ADDR_SIZE);
1138                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1139                        SAS_ADDR_SIZE);
1140         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1141                     SAS_ADDR(parent->sas_addr)) ||
1142                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1143                     SAS_ADDR(child->sas_addr)))
1144                    &&
1145                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1146                      SAS_ADDR(parent->sas_addr)) ||
1147                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1148                      SAS_ADDR(child->sas_addr))))
1149                 ;
1150         else {
1151                 res = -ENODEV;
1152                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1153                             "phy 0x%x link forms a third EEDS!\n",
1154                             SAS_ADDR(parent->sas_addr),
1155                             parent_phy->phy_id,
1156                             SAS_ADDR(child->sas_addr),
1157                             child_phy->phy_id);
1158         }
1159
1160         return res;
1161 }
1162
1163 /* Here we spill over 80 columns.  It is intentional.
1164  */
1165 static int sas_check_parent_topology(struct domain_device *child)
1166 {
1167         struct expander_device *child_ex = &child->ex_dev;
1168         struct expander_device *parent_ex;
1169         int i;
1170         int res = 0;
1171
1172         if (!child->parent)
1173                 return 0;
1174
1175         if (child->parent->dev_type != EDGE_DEV &&
1176             child->parent->dev_type != FANOUT_DEV)
1177                 return 0;
1178
1179         parent_ex = &child->parent->ex_dev;
1180
1181         for (i = 0; i < parent_ex->num_phys; i++) {
1182                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1183                 struct ex_phy *child_phy;
1184
1185                 if (parent_phy->phy_state == PHY_VACANT ||
1186                     parent_phy->phy_state == PHY_NOT_PRESENT)
1187                         continue;
1188
1189                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1190                         continue;
1191
1192                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1193
1194                 switch (child->parent->dev_type) {
1195                 case EDGE_DEV:
1196                         if (child->dev_type == FANOUT_DEV) {
1197                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1198                                     child_phy->routing_attr != TABLE_ROUTING) {
1199                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1200                                         res = -ENODEV;
1201                                 }
1202                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1203                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1204                                         res = sas_check_eeds(child, parent_phy, child_phy);
1205                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1206                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1207                                         res = -ENODEV;
1208                                 }
1209                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1210                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1211                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1212                                 res = -ENODEV;
1213                         }
1214                         break;
1215                 case FANOUT_DEV:
1216                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1217                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1218                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1219                                 res = -ENODEV;
1220                         }
1221                         break;
1222                 default:
1223                         break;
1224                 }
1225         }
1226
1227         return res;
1228 }
1229
1230 #define RRI_REQ_SIZE  16
1231 #define RRI_RESP_SIZE 44
1232
1233 static int sas_configure_present(struct domain_device *dev, int phy_id,
1234                                  u8 *sas_addr, int *index, int *present)
1235 {
1236         int i, res = 0;
1237         struct expander_device *ex = &dev->ex_dev;
1238         struct ex_phy *phy = &ex->ex_phy[phy_id];
1239         u8 *rri_req;
1240         u8 *rri_resp;
1241
1242         *present = 0;
1243         *index = 0;
1244
1245         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1246         if (!rri_req)
1247                 return -ENOMEM;
1248
1249         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1250         if (!rri_resp) {
1251                 kfree(rri_req);
1252                 return -ENOMEM;
1253         }
1254
1255         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1256         rri_req[9] = phy_id;
1257
1258         for (i = 0; i < ex->max_route_indexes ; i++) {
1259                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1260                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1261                                        RRI_RESP_SIZE);
1262                 if (res)
1263                         goto out;
1264                 res = rri_resp[2];
1265                 if (res == SMP_RESP_NO_INDEX) {
1266                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1267                                     "phy 0x%x index 0x%x\n",
1268                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1269                         goto out;
1270                 } else if (res != SMP_RESP_FUNC_ACC) {
1271                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1272                                     "result 0x%x\n", __FUNCTION__,
1273                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1274                         goto out;
1275                 }
1276                 if (SAS_ADDR(sas_addr) != 0) {
1277                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1278                                 *index = i;
1279                                 if ((rri_resp[12] & 0x80) == 0x80)
1280                                         *present = 0;
1281                                 else
1282                                         *present = 1;
1283                                 goto out;
1284                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1285                                 *index = i;
1286                                 *present = 0;
1287                                 goto out;
1288                         }
1289                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1290                            phy->last_da_index < i) {
1291                         phy->last_da_index = i;
1292                         *index = i;
1293                         *present = 0;
1294                         goto out;
1295                 }
1296         }
1297         res = -1;
1298 out:
1299         kfree(rri_req);
1300         kfree(rri_resp);
1301         return res;
1302 }
1303
1304 #define CRI_REQ_SIZE  44
1305 #define CRI_RESP_SIZE  8
1306
1307 static int sas_configure_set(struct domain_device *dev, int phy_id,
1308                              u8 *sas_addr, int index, int include)
1309 {
1310         int res;
1311         u8 *cri_req;
1312         u8 *cri_resp;
1313
1314         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1315         if (!cri_req)
1316                 return -ENOMEM;
1317
1318         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1319         if (!cri_resp) {
1320                 kfree(cri_req);
1321                 return -ENOMEM;
1322         }
1323
1324         cri_req[1] = SMP_CONF_ROUTE_INFO;
1325         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1326         cri_req[9] = phy_id;
1327         if (SAS_ADDR(sas_addr) == 0 || !include)
1328                 cri_req[12] |= 0x80;
1329         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1330
1331         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1332                                CRI_RESP_SIZE);
1333         if (res)
1334                 goto out;
1335         res = cri_resp[2];
1336         if (res == SMP_RESP_NO_INDEX) {
1337                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1338                             "index 0x%x\n",
1339                             SAS_ADDR(dev->sas_addr), phy_id, index);
1340         }
1341 out:
1342         kfree(cri_req);
1343         kfree(cri_resp);
1344         return res;
1345 }
1346
1347 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1348                                     u8 *sas_addr, int include)
1349 {
1350         int index;
1351         int present;
1352         int res;
1353
1354         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1355         if (res)
1356                 return res;
1357         if (include ^ present)
1358                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1359
1360         return res;
1361 }
1362
1363 /**
1364  * sas_configure_parent -- configure routing table of parent
1365  * parent: parent expander
1366  * child: child expander
1367  * sas_addr: SAS port identifier of device directly attached to child
1368  */
1369 static int sas_configure_parent(struct domain_device *parent,
1370                                 struct domain_device *child,
1371                                 u8 *sas_addr, int include)
1372 {
1373         struct expander_device *ex_parent = &parent->ex_dev;
1374         int res = 0;
1375         int i;
1376
1377         if (parent->parent) {
1378                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1379                                            include);
1380                 if (res)
1381                         return res;
1382         }
1383
1384         if (ex_parent->conf_route_table == 0) {
1385                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1386                             SAS_ADDR(parent->sas_addr));
1387                 return 0;
1388         }
1389
1390         for (i = 0; i < ex_parent->num_phys; i++) {
1391                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1392
1393                 if ((phy->routing_attr == TABLE_ROUTING) &&
1394                     (SAS_ADDR(phy->attached_sas_addr) ==
1395                      SAS_ADDR(child->sas_addr))) {
1396                         res = sas_configure_phy(parent, i, sas_addr, include);
1397                         if (res)
1398                                 return res;
1399                 }
1400         }
1401
1402         return res;
1403 }
1404
1405 /**
1406  * sas_configure_routing -- configure routing
1407  * dev: expander device
1408  * sas_addr: port identifier of device directly attached to the expander device
1409  */
1410 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1411 {
1412         if (dev->parent)
1413                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1414         return 0;
1415 }
1416
1417 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1418 {
1419         if (dev->parent)
1420                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1421         return 0;
1422 }
1423
1424 /**
1425  * sas_discover_expander -- expander discovery
1426  * @ex: pointer to expander domain device
1427  *
1428  * See comment in sas_discover_sata().
1429  */
1430 static int sas_discover_expander(struct domain_device *dev)
1431 {
1432         int res;
1433
1434         res = sas_notify_lldd_dev_found(dev);
1435         if (res)
1436                 return res;
1437
1438         res = sas_ex_general(dev);
1439         if (res)
1440                 goto out_err;
1441         res = sas_ex_manuf_info(dev);
1442         if (res)
1443                 goto out_err;
1444
1445         res = sas_expander_discover(dev);
1446         if (res) {
1447                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1448                             SAS_ADDR(dev->sas_addr), res);
1449                 goto out_err;
1450         }
1451
1452         sas_check_ex_subtractive_boundary(dev);
1453         res = sas_check_parent_topology(dev);
1454         if (res)
1455                 goto out_err;
1456         return 0;
1457 out_err:
1458         sas_notify_lldd_dev_gone(dev);
1459         return res;
1460 }
1461
1462 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1463 {
1464         int res = 0;
1465         struct domain_device *dev;
1466
1467         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1468                 if (dev->dev_type == EDGE_DEV ||
1469                     dev->dev_type == FANOUT_DEV) {
1470                         struct sas_expander_device *ex =
1471                                 rphy_to_expander_device(dev->rphy);
1472
1473                         if (level == ex->level)
1474                                 res = sas_ex_discover_devices(dev, -1);
1475                         else if (level > 0)
1476                                 res = sas_ex_discover_devices(port->port_dev, -1);
1477
1478                 }
1479         }
1480
1481         return res;
1482 }
1483
1484 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1485 {
1486         int res;
1487         int level;
1488
1489         do {
1490                 level = port->disc.max_level;
1491                 res = sas_ex_level_discovery(port, level);
1492                 mb();
1493         } while (level < port->disc.max_level);
1494
1495         return res;
1496 }
1497
1498 int sas_discover_root_expander(struct domain_device *dev)
1499 {
1500         int res;
1501         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1502
1503         res = sas_rphy_add(dev->rphy);
1504         if (res)
1505                 goto out_err;
1506
1507         ex->level = dev->port->disc.max_level; /* 0 */
1508         res = sas_discover_expander(dev);
1509         if (res)
1510                 goto out_err2;
1511
1512         sas_ex_bfs_disc(dev->port);
1513
1514         return res;
1515
1516 out_err2:
1517         sas_rphy_remove(dev->rphy);
1518 out_err:
1519         return res;
1520 }
1521
1522 /* ---------- Domain revalidation ---------- */
1523
1524 static int sas_get_phy_discover(struct domain_device *dev,
1525                                 int phy_id, struct smp_resp *disc_resp)
1526 {
1527         int res;
1528         u8 *disc_req;
1529
1530         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1531         if (!disc_req)
1532                 return -ENOMEM;
1533
1534         disc_req[1] = SMP_DISCOVER;
1535         disc_req[9] = phy_id;
1536
1537         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1538                                disc_resp, DISCOVER_RESP_SIZE);
1539         if (res)
1540                 goto out;
1541         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1542                 res = disc_resp->result;
1543                 goto out;
1544         }
1545 out:
1546         kfree(disc_req);
1547         return res;
1548 }
1549
1550 static int sas_get_phy_change_count(struct domain_device *dev,
1551                                     int phy_id, int *pcc)
1552 {
1553         int res;
1554         struct smp_resp *disc_resp;
1555
1556         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1557         if (!disc_resp)
1558                 return -ENOMEM;
1559
1560         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1561         if (!res)
1562                 *pcc = disc_resp->disc.change_count;
1563
1564         kfree(disc_resp);
1565         return res;
1566 }
1567
1568 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1569                                          int phy_id, u8 *attached_sas_addr)
1570 {
1571         int res;
1572         struct smp_resp *disc_resp;
1573         struct discover_resp *dr;
1574
1575         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1576         if (!disc_resp)
1577                 return -ENOMEM;
1578         dr = &disc_resp->disc;
1579
1580         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1581         if (!res) {
1582                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1583                 if (dr->attached_dev_type == 0)
1584                         memset(attached_sas_addr, 0, 8);
1585         }
1586         kfree(disc_resp);
1587         return res;
1588 }
1589
1590 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1591                               int from_phy)
1592 {
1593         struct expander_device *ex = &dev->ex_dev;
1594         int res = 0;
1595         int i;
1596
1597         for (i = from_phy; i < ex->num_phys; i++) {
1598                 int phy_change_count = 0;
1599
1600                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1601                 if (res)
1602                         goto out;
1603                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1604                         ex->ex_phy[i].phy_change_count = phy_change_count;
1605                         *phy_id = i;
1606                         return 0;
1607                 }
1608         }
1609 out:
1610         return res;
1611 }
1612
1613 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1614 {
1615         int res;
1616         u8  *rg_req;
1617         struct smp_resp  *rg_resp;
1618
1619         rg_req = alloc_smp_req(RG_REQ_SIZE);
1620         if (!rg_req)
1621                 return -ENOMEM;
1622
1623         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1624         if (!rg_resp) {
1625                 kfree(rg_req);
1626                 return -ENOMEM;
1627         }
1628
1629         rg_req[1] = SMP_REPORT_GENERAL;
1630
1631         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1632                                RG_RESP_SIZE);
1633         if (res)
1634                 goto out;
1635         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1636                 res = rg_resp->result;
1637                 goto out;
1638         }
1639
1640         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1641 out:
1642         kfree(rg_resp);
1643         kfree(rg_req);
1644         return res;
1645 }
1646
1647 static int sas_find_bcast_dev(struct domain_device *dev,
1648                               struct domain_device **src_dev)
1649 {
1650         struct expander_device *ex = &dev->ex_dev;
1651         int ex_change_count = -1;
1652         int res;
1653
1654         res = sas_get_ex_change_count(dev, &ex_change_count);
1655         if (res)
1656                 goto out;
1657         if (ex_change_count != -1 &&
1658             ex_change_count != ex->ex_change_count) {
1659                 *src_dev = dev;
1660                 ex->ex_change_count = ex_change_count;
1661         } else {
1662                 struct domain_device *ch;
1663
1664                 list_for_each_entry(ch, &ex->children, siblings) {
1665                         if (ch->dev_type == EDGE_DEV ||
1666                             ch->dev_type == FANOUT_DEV) {
1667                                 res = sas_find_bcast_dev(ch, src_dev);
1668                                 if (src_dev)
1669                                         return res;
1670                         }
1671                 }
1672         }
1673 out:
1674         return res;
1675 }
1676
1677 static void sas_unregister_ex_tree(struct domain_device *dev)
1678 {
1679         struct expander_device *ex = &dev->ex_dev;
1680         struct domain_device *child, *n;
1681
1682         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1683                 if (child->dev_type == EDGE_DEV ||
1684                     child->dev_type == FANOUT_DEV)
1685                         sas_unregister_ex_tree(child);
1686                 else
1687                         sas_unregister_dev(child);
1688         }
1689         sas_unregister_dev(dev);
1690 }
1691
1692 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1693                                          int phy_id)
1694 {
1695         struct expander_device *ex_dev = &parent->ex_dev;
1696         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1697         struct domain_device *child, *n;
1698
1699         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1700                 if (SAS_ADDR(child->sas_addr) ==
1701                     SAS_ADDR(phy->attached_sas_addr)) {
1702                         if (child->dev_type == EDGE_DEV ||
1703                             child->dev_type == FANOUT_DEV)
1704                                 sas_unregister_ex_tree(child);
1705                         else
1706                                 sas_unregister_dev(child);
1707                         break;
1708                 }
1709         }
1710         sas_disable_routing(parent, phy->attached_sas_addr);
1711         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1712         sas_port_delete_phy(phy->port, phy->phy);
1713         if (phy->port->num_phys == 0)
1714                 sas_port_delete(phy->port);
1715         phy->port = NULL;
1716 }
1717
1718 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1719                                           const int level)
1720 {
1721         struct expander_device *ex_root = &root->ex_dev;
1722         struct domain_device *child;
1723         int res = 0;
1724
1725         list_for_each_entry(child, &ex_root->children, siblings) {
1726                 if (child->dev_type == EDGE_DEV ||
1727                     child->dev_type == FANOUT_DEV) {
1728                         struct sas_expander_device *ex =
1729                                 rphy_to_expander_device(child->rphy);
1730
1731                         if (level > ex->level)
1732                                 res = sas_discover_bfs_by_root_level(child,
1733                                                                      level);
1734                         else if (level == ex->level)
1735                                 res = sas_ex_discover_devices(child, -1);
1736                 }
1737         }
1738         return res;
1739 }
1740
1741 static int sas_discover_bfs_by_root(struct domain_device *dev)
1742 {
1743         int res;
1744         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1745         int level = ex->level+1;
1746
1747         res = sas_ex_discover_devices(dev, -1);
1748         if (res)
1749                 goto out;
1750         do {
1751                 res = sas_discover_bfs_by_root_level(dev, level);
1752                 mb();
1753                 level += 1;
1754         } while (level <= dev->port->disc.max_level);
1755 out:
1756         return res;
1757 }
1758
1759 static int sas_discover_new(struct domain_device *dev, int phy_id)
1760 {
1761         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1762         struct domain_device *child;
1763         int res;
1764
1765         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1766                     SAS_ADDR(dev->sas_addr), phy_id);
1767         res = sas_ex_phy_discover(dev, phy_id);
1768         if (res)
1769                 goto out;
1770         res = sas_ex_discover_devices(dev, phy_id);
1771         if (res)
1772                 goto out;
1773         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1774                 if (SAS_ADDR(child->sas_addr) ==
1775                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1776                         if (child->dev_type == EDGE_DEV ||
1777                             child->dev_type == FANOUT_DEV)
1778                                 res = sas_discover_bfs_by_root(child);
1779                         break;
1780                 }
1781         }
1782 out:
1783         return res;
1784 }
1785
1786 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1787 {
1788         struct expander_device *ex = &dev->ex_dev;
1789         struct ex_phy *phy = &ex->ex_phy[phy_id];
1790         u8 attached_sas_addr[8];
1791         int res;
1792
1793         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1794         switch (res) {
1795         case SMP_RESP_NO_PHY:
1796                 phy->phy_state = PHY_NOT_PRESENT;
1797                 sas_unregister_devs_sas_addr(dev, phy_id);
1798                 goto out; break;
1799         case SMP_RESP_PHY_VACANT:
1800                 phy->phy_state = PHY_VACANT;
1801                 sas_unregister_devs_sas_addr(dev, phy_id);
1802                 goto out; break;
1803         case SMP_RESP_FUNC_ACC:
1804                 break;
1805         }
1806
1807         if (SAS_ADDR(attached_sas_addr) == 0) {
1808                 phy->phy_state = PHY_EMPTY;
1809                 sas_unregister_devs_sas_addr(dev, phy_id);
1810         } else if (SAS_ADDR(attached_sas_addr) ==
1811                    SAS_ADDR(phy->attached_sas_addr)) {
1812                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1813                             SAS_ADDR(dev->sas_addr), phy_id);
1814                 sas_ex_phy_discover(dev, phy_id);
1815         } else
1816                 res = sas_discover_new(dev, phy_id);
1817 out:
1818         return res;
1819 }
1820
1821 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1822 {
1823         struct expander_device *ex = &dev->ex_dev;
1824         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1825         int res = 0;
1826         int i;
1827
1828         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1829                     SAS_ADDR(dev->sas_addr), phy_id);
1830
1831         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1832                 for (i = 0; i < ex->num_phys; i++) {
1833                         struct ex_phy *phy = &ex->ex_phy[i];
1834
1835                         if (i == phy_id)
1836                                 continue;
1837                         if (SAS_ADDR(phy->attached_sas_addr) ==
1838                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1839                                 SAS_DPRINTK("phy%d part of wide port with "
1840                                             "phy%d\n", phy_id, i);
1841                                 goto out;
1842                         }
1843                 }
1844                 res = sas_rediscover_dev(dev, phy_id);
1845         } else
1846                 res = sas_discover_new(dev, phy_id);
1847 out:
1848         return res;
1849 }
1850
1851 /**
1852  * sas_revalidate_domain -- revalidate the domain
1853  * @port: port to the domain of interest
1854  *
1855  * NOTE: this process _must_ quit (return) as soon as any connection
1856  * errors are encountered.  Connection recovery is done elsewhere.
1857  * Discover process only interrogates devices in order to discover the
1858  * domain.
1859  */
1860 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1861 {
1862         int res;
1863         struct domain_device *dev = NULL;
1864
1865         res = sas_find_bcast_dev(port_dev, &dev);
1866         if (res)
1867                 goto out;
1868         if (dev) {
1869                 struct expander_device *ex = &dev->ex_dev;
1870                 int i = 0, phy_id;
1871
1872                 do {
1873                         phy_id = -1;
1874                         res = sas_find_bcast_phy(dev, &phy_id, i);
1875                         if (phy_id == -1)
1876                                 break;
1877                         res = sas_rediscover(dev, phy_id);
1878                         i = phy_id + 1;
1879                 } while (i < ex->num_phys);
1880         }
1881 out:
1882         return res;
1883 }
1884
1885 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1886                     struct request *req)
1887 {
1888         struct domain_device *dev;
1889         int ret, type;
1890         struct request *rsp = req->next_rq;
1891
1892         if (!rsp) {
1893                 printk("%s: space for a smp response is missing\n",
1894                        __FUNCTION__);
1895                 return -EINVAL;
1896         }
1897
1898         /* no rphy means no smp target support (ie aic94xx host) */
1899         if (!rphy) {
1900                 printk("%s: can we send a smp request to a host?\n",
1901                        __FUNCTION__);
1902                 return -EINVAL;
1903         }
1904         type = rphy->identify.device_type;
1905
1906         if (type != SAS_EDGE_EXPANDER_DEVICE &&
1907             type != SAS_FANOUT_EXPANDER_DEVICE) {
1908                 printk("%s: can we send a smp request to a device?\n",
1909                        __FUNCTION__);
1910                 return -EINVAL;
1911         }
1912
1913         dev = sas_find_dev_by_rphy(rphy);
1914         if (!dev) {
1915                 printk("%s: fail to find a domain_device?\n", __FUNCTION__);
1916                 return -EINVAL;
1917         }
1918
1919         /* do we need to support multiple segments? */
1920         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
1921                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
1922                        __FUNCTION__, req->bio->bi_vcnt, req->data_len,
1923                        rsp->bio->bi_vcnt, rsp->data_len);
1924                 return -EINVAL;
1925         }
1926
1927         ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
1928                                bio_data(rsp->bio), rsp->data_len);
1929
1930         return ret;
1931 }