git.oblomov.eu Git - linux-2.6/blob - 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 = -ECOMM;
 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                 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
 113                       task->task_status.stat == SAS_DATA_UNDERRUN) {
 114                         /* no error, but return the number of bytes of
 115                          * underrun */
 116                         res = task->task_status.residual;
 117                         break;
 118                 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
 119                       task->task_status.stat == SAS_DATA_OVERRUN) {
 120                         res = -EMSGSIZE;
 121                         break;
 122                 } else {
 123                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 124                                     "status 0x%x\n", __func__,
 125                                     SAS_ADDR(dev->sas_addr),
 126                                     task->task_status.resp,
 127                                     task->task_status.stat);
 128                         sas_free_task(task);
 129                         task = NULL;
 130                 }
 131         }
 132 ex_err:
 133         BUG_ON(retry == 3 && task != NULL);
 134         if (task != NULL) {
 135                 sas_free_task(task);
 136         }
 137         return res;
 138 }
 139
 140 /* ---------- Allocations ---------- */
 141
 142 static inline void *alloc_smp_req(int size)
 143 {
 144         u8 *p = kzalloc(size, GFP_KERNEL);
 145         if (p)
 146                 p[0] = SMP_REQUEST;
 147         return p;
 148 }
 149
 150 static inline void *alloc_smp_resp(int size)
 151 {
 152         return kzalloc(size, GFP_KERNEL);
 153 }
 154
 155 /* ---------- Expander configuration ---------- */
 156
 157 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 158                            void *disc_resp)
 159 {
 160         struct expander_device *ex = &dev->ex_dev;
 161         struct ex_phy *phy = &ex->ex_phy[phy_id];
 162         struct smp_resp *resp = disc_resp;
 163         struct discover_resp *dr = &resp->disc;
 164         struct sas_rphy *rphy = dev->rphy;
 165         int rediscover = (phy->phy != NULL);
 166
 167         if (!rediscover) {
 168                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 169
 170                 /* FIXME: error_handling */
 171                 BUG_ON(!phy->phy);
 172         }
 173
 174         switch (resp->result) {
 175         case SMP_RESP_PHY_VACANT:
 176                 phy->phy_state = PHY_VACANT;
 177                 return;
 178         default:
 179                 phy->phy_state = PHY_NOT_PRESENT;
 180                 return;
 181         case SMP_RESP_FUNC_ACC:
 182                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 183                 break;
 184         }
 185
 186         phy->phy_id = phy_id;
 187         phy->attached_dev_type = dr->attached_dev_type;
 188         phy->linkrate = dr->linkrate;
 189         phy->attached_sata_host = dr->attached_sata_host;
 190         phy->attached_sata_dev  = dr->attached_sata_dev;
 191         phy->attached_sata_ps   = dr->attached_sata_ps;
 192         phy->attached_iproto = dr->iproto << 1;
 193         phy->attached_tproto = dr->tproto << 1;
 194         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 195         phy->attached_phy_id = dr->attached_phy_id;
 196         phy->phy_change_count = dr->change_count;
 197         phy->routing_attr = dr->routing_attr;
 198         phy->virtual = dr->virtual;
 199         phy->last_da_index = -1;
 200
 201         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 202         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 203         phy->phy->identify.phy_identifier = phy_id;
 204         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 205         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 206         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 207         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 208         phy->phy->negotiated_linkrate = phy->linkrate;
 209
 210         if (!rediscover)
 211                 sas_phy_add(phy->phy);
 212
 213         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 214                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 215                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 216                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 217                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 218                     SAS_ADDR(phy->attached_sas_addr));
 219
 220         return;
 221 }
 222
 223 #define DISCOVER_REQ_SIZE  16
 224 #define DISCOVER_RESP_SIZE 56
 225
 226 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 227                                       u8 *disc_resp, int single)
 228 {
 229         int i, res;
 230
 231         disc_req[9] = single;
 232         for (i = 1 ; i < 3; i++) {
 233                 struct discover_resp *dr;
 234
 235                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 236                                        disc_resp, DISCOVER_RESP_SIZE);
 237                 if (res)
 238                         return res;
 239                 /* This is detecting a failure to transmit inital
 240                  * dev to host FIS as described in section G.5 of
 241                  * sas-2 r 04b */
 242                 dr = &((struct smp_resp *)disc_resp)->disc;
 243                 if (!(dr->attached_dev_type == 0 &&
 244                       dr->attached_sata_dev))
 245                         break;
 246                 /* In order to generate the dev to host FIS, we
 247                  * send a link reset to the expander port */
 248                 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
 249                 /* Wait for the reset to trigger the negotiation */
 250                 msleep(500);
 251         }
 252         sas_set_ex_phy(dev, single, disc_resp);
 253         return 0;
 254 }
 255
 256 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 257 {
 258         struct expander_device *ex = &dev->ex_dev;
 259         int  res = 0;
 260         u8   *disc_req;
 261         u8   *disc_resp;
 262
 263         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 264         if (!disc_req)
 265                 return -ENOMEM;
 266
 267         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 268         if (!disc_resp) {
 269                 kfree(disc_req);
 270                 return -ENOMEM;
 271         }
 272
 273         disc_req[1] = SMP_DISCOVER;
 274
 275         if (0 <= single && single < ex->num_phys) {
 276                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 277         } else {
 278                 int i;
 279
 280                 for (i = 0; i < ex->num_phys; i++) {
 281                         res = sas_ex_phy_discover_helper(dev, disc_req,
 282                                                          disc_resp, i);
 283                         if (res)
 284                                 goto out_err;
 285                 }
 286         }
 287 out_err:
 288         kfree(disc_resp);
 289         kfree(disc_req);
 290         return res;
 291 }
 292
 293 static int sas_expander_discover(struct domain_device *dev)
 294 {
 295         struct expander_device *ex = &dev->ex_dev;
 296         int res = -ENOMEM;
 297
 298         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 299         if (!ex->ex_phy)
 300                 return -ENOMEM;
 301
 302         res = sas_ex_phy_discover(dev, -1);
 303         if (res)
 304                 goto out_err;
 305
 306         return 0;
 307  out_err:
 308         kfree(ex->ex_phy);
 309         ex->ex_phy = NULL;
 310         return res;
 311 }
 312
 313 #define MAX_EXPANDER_PHYS 128
 314
 315 static void ex_assign_report_general(struct domain_device *dev,
 316                                             struct smp_resp *resp)
 317 {
 318         struct report_general_resp *rg = &resp->rg;
 319
 320         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 321         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 322         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 323         dev->ex_dev.conf_route_table = rg->conf_route_table;
 324         dev->ex_dev.configuring = rg->configuring;
 325         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 326 }
 327
 328 #define RG_REQ_SIZE   8
 329 #define RG_RESP_SIZE 32
 330
 331 static int sas_ex_general(struct domain_device *dev)
 332 {
 333         u8 *rg_req;
 334         struct smp_resp *rg_resp;
 335         int res;
 336         int i;
 337
 338         rg_req = alloc_smp_req(RG_REQ_SIZE);
 339         if (!rg_req)
 340                 return -ENOMEM;
 341
 342         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 343         if (!rg_resp) {
 344                 kfree(rg_req);
 345                 return -ENOMEM;
 346         }
 347
 348         rg_req[1] = SMP_REPORT_GENERAL;
 349
 350         for (i = 0; i < 5; i++) {
 351                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 352                                        RG_RESP_SIZE);
 353
 354                 if (res) {
 355                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 356                                     SAS_ADDR(dev->sas_addr), res);
 357                         goto out;
 358                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 359                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 360                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 361                         res = rg_resp->result;
 362                         goto out;
 363                 }
 364
 365                 ex_assign_report_general(dev, rg_resp);
 366
 367                 if (dev->ex_dev.configuring) {
 368                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 369                                     SAS_ADDR(dev->sas_addr));
 370                         schedule_timeout_interruptible(5*HZ);
 371                 } else
 372                         break;
 373         }
 374 out:
 375         kfree(rg_req);
 376         kfree(rg_resp);
 377         return res;
 378 }
 379
 380 static void ex_assign_manuf_info(struct domain_device *dev, void
 381                                         *_mi_resp)
 382 {
 383         u8 *mi_resp = _mi_resp;
 384         struct sas_rphy *rphy = dev->rphy;
 385         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 386
 387         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 388         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 389         memcpy(edev->product_rev, mi_resp + 36,
 390                SAS_EXPANDER_PRODUCT_REV_LEN);
 391
 392         if (mi_resp[8] & 1) {
 393                 memcpy(edev->component_vendor_id, mi_resp + 40,
 394                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 395                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 396                 edev->component_revision_id = mi_resp[50];
 397         }
 398 }
 399
 400 #define MI_REQ_SIZE   8
 401 #define MI_RESP_SIZE 64
 402
 403 static int sas_ex_manuf_info(struct domain_device *dev)
 404 {
 405         u8 *mi_req;
 406         u8 *mi_resp;
 407         int res;
 408
 409         mi_req = alloc_smp_req(MI_REQ_SIZE);
 410         if (!mi_req)
 411                 return -ENOMEM;
 412
 413         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 414         if (!mi_resp) {
 415                 kfree(mi_req);
 416                 return -ENOMEM;
 417         }
 418
 419         mi_req[1] = SMP_REPORT_MANUF_INFO;
 420
 421         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 422         if (res) {
 423                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 424                             SAS_ADDR(dev->sas_addr), res);
 425                 goto out;
 426         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 427                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 428                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 429                 goto out;
 430         }
 431
 432         ex_assign_manuf_info(dev, mi_resp);
 433 out:
 434         kfree(mi_req);
 435         kfree(mi_resp);
 436         return res;
 437 }
 438
 439 #define PC_REQ_SIZE  44
 440 #define PC_RESP_SIZE 8
 441
 442 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 443                         enum phy_func phy_func,
 444                         struct sas_phy_linkrates *rates)
 445 {
 446         u8 *pc_req;
 447         u8 *pc_resp;
 448         int res;
 449
 450         pc_req = alloc_smp_req(PC_REQ_SIZE);
 451         if (!pc_req)
 452                 return -ENOMEM;
 453
 454         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 455         if (!pc_resp) {
 456                 kfree(pc_req);
 457                 return -ENOMEM;
 458         }
 459
 460         pc_req[1] = SMP_PHY_CONTROL;
 461         pc_req[9] = phy_id;
 462         pc_req[10]= phy_func;
 463         if (rates) {
 464                 pc_req[32] = rates->minimum_linkrate << 4;
 465                 pc_req[33] = rates->maximum_linkrate << 4;
 466         }
 467
 468         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 469
 470         kfree(pc_resp);
 471         kfree(pc_req);
 472         return res;
 473 }
 474
 475 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 476 {
 477         struct expander_device *ex = &dev->ex_dev;
 478         struct ex_phy *phy = &ex->ex_phy[phy_id];
 479
 480         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 481         phy->linkrate = SAS_PHY_DISABLED;
 482 }
 483
 484 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 485 {
 486         struct expander_device *ex = &dev->ex_dev;
 487         int i;
 488
 489         for (i = 0; i < ex->num_phys; i++) {
 490                 struct ex_phy *phy = &ex->ex_phy[i];
 491
 492                 if (phy->phy_state == PHY_VACANT ||
 493                     phy->phy_state == PHY_NOT_PRESENT)
 494                         continue;
 495
 496                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 497                         sas_ex_disable_phy(dev, i);
 498         }
 499 }
 500
 501 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 502                                             u8 *sas_addr)
 503 {
 504         struct domain_device *dev;
 505
 506         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 507                 return 1;
 508         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 509                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 510                         return 1;
 511         }
 512         return 0;
 513 }
 514
 515 #define RPEL_REQ_SIZE   16
 516 #define RPEL_RESP_SIZE  32
 517 int sas_smp_get_phy_events(struct sas_phy *phy)
 518 {
 519         int res;
 520         u8 *req;
 521         u8 *resp;
 522         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 523         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 524
 525         req = alloc_smp_req(RPEL_REQ_SIZE);
 526         if (!req)
 527                 return -ENOMEM;
 528
 529         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 530         if (!resp) {
 531                 kfree(req);
 532                 return -ENOMEM;
 533         }
 534
 535         req[1] = SMP_REPORT_PHY_ERR_LOG;
 536         req[9] = phy->number;
 537
 538         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 539                                     resp, RPEL_RESP_SIZE);
 540
 541         if (!res)
 542                 goto out;
 543
 544         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 545         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 546         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 547         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 548
 549  out:
 550         kfree(resp);
 551         return res;
 552
 553 }
 554
 555 #ifdef CONFIG_SCSI_SAS_ATA
 556
 557 #define RPS_REQ_SIZE  16
 558 #define RPS_RESP_SIZE 60
 559
 560 static int sas_get_report_phy_sata(struct domain_device *dev,
 561                                           int phy_id,
 562                                           struct smp_resp *rps_resp)
 563 {
 564         int res;
 565         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 566         u8 *resp = (u8 *)rps_resp;
 567
 568         if (!rps_req)
 569                 return -ENOMEM;
 570
 571         rps_req[1] = SMP_REPORT_PHY_SATA;
 572         rps_req[9] = phy_id;
 573
 574         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 575                                     rps_resp, RPS_RESP_SIZE);
 576
 577         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 578          * standards cockup here.  sas-2 explicitly specifies the FIS
 579          * should be encoded so that FIS type is in resp[24].
 580          * However, some expanders endian reverse this.  Undo the
 581          * reversal here */
 582         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 583                 int i;
 584
 585                 for (i = 0; i < 5; i++) {
 586                         int j = 24 + (i*4);
 587                         u8 a, b;
 588                         a = resp[j + 0];
 589                         b = resp[j + 1];
 590                         resp[j + 0] = resp[j + 3];
 591                         resp[j + 1] = resp[j + 2];
 592                         resp[j + 2] = b;
 593                         resp[j + 3] = a;
 594                 }
 595         }
 596
 597         kfree(rps_req);
 598         return res;
 599 }
 600 #endif
 601
 602 static void sas_ex_get_linkrate(struct domain_device *parent,
 603                                        struct domain_device *child,
 604                                        struct ex_phy *parent_phy)
 605 {
 606         struct expander_device *parent_ex = &parent->ex_dev;
 607         struct sas_port *port;
 608         int i;
 609
 610         child->pathways = 0;
 611
 612         port = parent_phy->port;
 613
 614         for (i = 0; i < parent_ex->num_phys; i++) {
 615                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 616
 617                 if (phy->phy_state == PHY_VACANT ||
 618                     phy->phy_state == PHY_NOT_PRESENT)
 619                         continue;
 620
 621                 if (SAS_ADDR(phy->attached_sas_addr) ==
 622                     SAS_ADDR(child->sas_addr)) {
 623
 624                         child->min_linkrate = min(parent->min_linkrate,
 625                                                   phy->linkrate);
 626                         child->max_linkrate = max(parent->max_linkrate,
 627                                                   phy->linkrate);
 628                         child->pathways++;
 629                         sas_port_add_phy(port, phy->phy);
 630                 }
 631         }
 632         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 633         child->pathways = min(child->pathways, parent->pathways);
 634 }
 635
 636 static struct domain_device *sas_ex_discover_end_dev(
 637         struct domain_device *parent, int phy_id)
 638 {
 639         struct expander_device *parent_ex = &parent->ex_dev;
 640         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 641         struct domain_device *child = NULL;
 642         struct sas_rphy *rphy;
 643         int res;
 644
 645         if (phy->attached_sata_host || phy->attached_sata_ps)
 646                 return NULL;
 647
 648         child = kzalloc(sizeof(*child), GFP_KERNEL);
 649         if (!child)
 650                 return NULL;
 651
 652         child->parent = parent;
 653         child->port   = parent->port;
 654         child->iproto = phy->attached_iproto;
 655         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 656         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 657         if (!phy->port) {
 658                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 659                 if (unlikely(!phy->port))
 660                         goto out_err;
 661                 if (unlikely(sas_port_add(phy->port) != 0)) {
 662                         sas_port_free(phy->port);
 663                         goto out_err;
 664                 }
 665         }
 666         sas_ex_get_linkrate(parent, child, phy);
 667
 668 #ifdef CONFIG_SCSI_SAS_ATA
 669         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 670                 child->dev_type = SATA_DEV;
 671                 if (phy->attached_tproto & SAS_PROTOCOL_STP)
 672                         child->tproto = phy->attached_tproto;
 673                 if (phy->attached_sata_dev)
 674                         child->tproto |= SATA_DEV;
 675                 res = sas_get_report_phy_sata(parent, phy_id,
 676                                               &child->sata_dev.rps_resp);
 677                 if (res) {
 678                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 679                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 680                                     phy_id, res);
 681                         goto out_free;
 682                 }
 683                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 684                        sizeof(struct dev_to_host_fis));
 685
 686                 rphy = sas_end_device_alloc(phy->port);
 687                 if (unlikely(!rphy))
 688                         goto out_free;
 689
 690                 sas_init_dev(child);
 691
 692                 child->rphy = rphy;
 693
 694                 spin_lock_irq(&parent->port->dev_list_lock);
 695                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 696                 spin_unlock_irq(&parent->port->dev_list_lock);
 697
 698                 res = sas_discover_sata(child);
 699                 if (res) {
 700                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 701                                     "%016llx:0x%x returned 0x%x\n",
 702                                     SAS_ADDR(child->sas_addr),
 703                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 704                         goto out_list_del;
 705                 }
 706         } else
 707 #endif
 708           if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 709                 child->dev_type = SAS_END_DEV;
 710                 rphy = sas_end_device_alloc(phy->port);
 711                 /* FIXME: error handling */
 712                 if (unlikely(!rphy))
 713                         goto out_free;
 714                 child->tproto = phy->attached_tproto;
 715                 sas_init_dev(child);
 716
 717                 child->rphy = rphy;
 718                 sas_fill_in_rphy(child, rphy);
 719
 720                 spin_lock_irq(&parent->port->dev_list_lock);
 721                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 722                 spin_unlock_irq(&parent->port->dev_list_lock);
 723
 724                 res = sas_discover_end_dev(child);
 725                 if (res) {
 726                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 727                                     "at %016llx:0x%x returned 0x%x\n",
 728                                     SAS_ADDR(child->sas_addr),
 729                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 730                         goto out_list_del;
 731                 }
 732         } else {
 733                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 734                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 735                             phy_id);
 736                 goto out_free;
 737         }
 738
 739         list_add_tail(&child->siblings, &parent_ex->children);
 740         return child;
 741
 742  out_list_del:
 743         sas_rphy_free(child->rphy);
 744         child->rphy = NULL;
 745         list_del(&child->dev_list_node);
 746  out_free:
 747         sas_port_delete(phy->port);
 748  out_err:
 749         phy->port = NULL;
 750         kfree(child);
 751         return NULL;
 752 }
 753
 754 /* See if this phy is part of a wide port */
 755 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 756 {
 757         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 758         int i;
 759
 760         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 761                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 762
 763                 if (ephy == phy)
 764                         continue;
 765
 766                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 767                             SAS_ADDR_SIZE) && ephy->port) {
 768                         sas_port_add_phy(ephy->port, phy->phy);
 769                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 770                         return 0;
 771                 }
 772         }
 773
 774         return -ENODEV;
 775 }
 776
 777 static struct domain_device *sas_ex_discover_expander(
 778         struct domain_device *parent, int phy_id)
 779 {
 780         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 781         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 782         struct domain_device *child = NULL;
 783         struct sas_rphy *rphy;
 784         struct sas_expander_device *edev;
 785         struct asd_sas_port *port;
 786         int res;
 787
 788         if (phy->routing_attr == DIRECT_ROUTING) {
 789                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 790                             "allowed\n",
 791                             SAS_ADDR(parent->sas_addr), phy_id,
 792                             SAS_ADDR(phy->attached_sas_addr),
 793                             phy->attached_phy_id);
 794                 return NULL;
 795         }
 796         child = kzalloc(sizeof(*child), GFP_KERNEL);
 797         if (!child)
 798                 return NULL;
 799
 800         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 801         /* FIXME: better error handling */
 802         BUG_ON(sas_port_add(phy->port) != 0);
 803
 804
 805         switch (phy->attached_dev_type) {
 806         case EDGE_DEV:
 807                 rphy = sas_expander_alloc(phy->port,
 808                                           SAS_EDGE_EXPANDER_DEVICE);
 809                 break;
 810         case FANOUT_DEV:
 811                 rphy = sas_expander_alloc(phy->port,
 812                                           SAS_FANOUT_EXPANDER_DEVICE);
 813                 break;
 814         default:
 815                 rphy = NULL;    /* shut gcc up */
 816                 BUG();
 817         }
 818         port = parent->port;
 819         child->rphy = rphy;
 820         edev = rphy_to_expander_device(rphy);
 821         child->dev_type = phy->attached_dev_type;
 822         child->parent = parent;
 823         child->port = port;
 824         child->iproto = phy->attached_iproto;
 825         child->tproto = phy->attached_tproto;
 826         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 827         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 828         sas_ex_get_linkrate(parent, child, phy);
 829         edev->level = parent_ex->level + 1;
 830         parent->port->disc.max_level = max(parent->port->disc.max_level,
 831                                            edev->level);
 832         sas_init_dev(child);
 833         sas_fill_in_rphy(child, rphy);
 834         sas_rphy_add(rphy);
 835
 836         spin_lock_irq(&parent->port->dev_list_lock);
 837         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 838         spin_unlock_irq(&parent->port->dev_list_lock);
 839
 840         res = sas_discover_expander(child);
 841         if (res) {
 842                 kfree(child);
 843                 return NULL;
 844         }
 845         list_add_tail(&child->siblings, &parent->ex_dev.children);
 846         return child;
 847 }
 848
 849 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 850 {
 851         struct expander_device *ex = &dev->ex_dev;
 852         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 853         struct domain_device *child = NULL;
 854         int res = 0;
 855
 856         /* Phy state */
 857         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 858                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 859                         res = sas_ex_phy_discover(dev, phy_id);
 860                 if (res)
 861                         return res;
 862         }
 863
 864         /* Parent and domain coherency */
 865         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 866                              SAS_ADDR(dev->port->sas_addr))) {
 867                 sas_add_parent_port(dev, phy_id);
 868                 return 0;
 869         }
 870         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 871                             SAS_ADDR(dev->parent->sas_addr))) {
 872                 sas_add_parent_port(dev, phy_id);
 873                 if (ex_phy->routing_attr == TABLE_ROUTING)
 874                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 875                 return 0;
 876         }
 877
 878         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 879                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 880
 881         if (ex_phy->attached_dev_type == NO_DEVICE) {
 882                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 883                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 884                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 885                 }
 886                 return 0;
 887         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 888                 return 0;
 889
 890         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 891             ex_phy->attached_dev_type != FANOUT_DEV &&
 892             ex_phy->attached_dev_type != EDGE_DEV) {
 893                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 894                             "phy 0x%x\n", ex_phy->attached_dev_type,
 895                             SAS_ADDR(dev->sas_addr),
 896                             phy_id);
 897                 return 0;
 898         }
 899
 900         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 901         if (res) {
 902                 SAS_DPRINTK("configure routing for dev %016llx "
 903                             "reported 0x%x. Forgotten\n",
 904                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 905                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 906                 return res;
 907         }
 908
 909         res = sas_ex_join_wide_port(dev, phy_id);
 910         if (!res) {
 911                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 912                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 913                 return res;
 914         }
 915
 916         switch (ex_phy->attached_dev_type) {
 917         case SAS_END_DEV:
 918                 child = sas_ex_discover_end_dev(dev, phy_id);
 919                 break;
 920         case FANOUT_DEV:
 921                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 922                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 923                                     "attached to ex %016llx phy 0x%x\n",
 924                                     SAS_ADDR(ex_phy->attached_sas_addr),
 925                                     ex_phy->attached_phy_id,
 926                                     SAS_ADDR(dev->sas_addr),
 927                                     phy_id);
 928                         sas_ex_disable_phy(dev, phy_id);
 929                         break;
 930                 } else
 931                         memcpy(dev->port->disc.fanout_sas_addr,
 932                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 933                 /* fallthrough */
 934         case EDGE_DEV:
 935                 child = sas_ex_discover_expander(dev, phy_id);
 936                 break;
 937         default:
 938                 break;
 939         }
 940
 941         if (child) {
 942                 int i;
 943
 944                 for (i = 0; i < ex->num_phys; i++) {
 945                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 946                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 947                                 continue;
 948
 949                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 950                             SAS_ADDR(child->sas_addr))
 951                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 952                 }
 953         }
 954
 955         return res;
 956 }
 957
 958 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 959 {
 960         struct expander_device *ex = &dev->ex_dev;
 961         int i;
 962
 963         for (i = 0; i < ex->num_phys; i++) {
 964                 struct ex_phy *phy = &ex->ex_phy[i];
 965
 966                 if (phy->phy_state == PHY_VACANT ||
 967                     phy->phy_state == PHY_NOT_PRESENT)
 968                         continue;
 969
 970                 if ((phy->attached_dev_type == EDGE_DEV ||
 971                      phy->attached_dev_type == FANOUT_DEV) &&
 972                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 973
 974                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 975
 976                         return 1;
 977                 }
 978         }
 979         return 0;
 980 }
 981
 982 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 983 {
 984         struct expander_device *ex = &dev->ex_dev;
 985         struct domain_device *child;
 986         u8 sub_addr[8] = {0, };
 987
 988         list_for_each_entry(child, &ex->children, siblings) {
 989                 if (child->dev_type != EDGE_DEV &&
 990                     child->dev_type != FANOUT_DEV)
 991                         continue;
 992                 if (sub_addr[0] == 0) {
 993                         sas_find_sub_addr(child, sub_addr);
 994                         continue;
 995                 } else {
 996                         u8 s2[8];
 997
 998                         if (sas_find_sub_addr(child, s2) &&
 999                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1000
1001                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1002                                             "diverges from subtractive "
1003                                             "boundary %016llx\n",
1004                                             SAS_ADDR(dev->sas_addr),
1005                                             SAS_ADDR(child->sas_addr),
1006                                             SAS_ADDR(s2),
1007                                             SAS_ADDR(sub_addr));
1008
1009                                 sas_ex_disable_port(child, s2);
1010                         }
1011                 }
1012         }
1013         return 0;
1014 }
1015 /**
1016  * sas_ex_discover_devices -- discover devices attached to this expander
1017  * dev: pointer to the expander domain device
1018  * single: if you want to do a single phy, else set to -1;
1019  *
1020  * Configure this expander for use with its devices and register the
1021  * devices of this expander.
1022  */
1023 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1024 {
1025         struct expander_device *ex = &dev->ex_dev;
1026         int i = 0, end = ex->num_phys;
1027         int res = 0;
1028
1029         if (0 <= single && single < end) {
1030                 i = single;
1031                 end = i+1;
1032         }
1033
1034         for ( ; i < end; i++) {
1035                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1036
1037                 if (ex_phy->phy_state == PHY_VACANT ||
1038                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1039                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1040                         continue;
1041
1042                 switch (ex_phy->linkrate) {
1043                 case SAS_PHY_DISABLED:
1044                 case SAS_PHY_RESET_PROBLEM:
1045                 case SAS_SATA_PORT_SELECTOR:
1046                         continue;
1047                 default:
1048                         res = sas_ex_discover_dev(dev, i);
1049                         if (res)
1050                                 break;
1051                         continue;
1052                 }
1053         }
1054
1055         if (!res)
1056                 sas_check_level_subtractive_boundary(dev);
1057
1058         return res;
1059 }
1060
1061 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1062 {
1063         struct expander_device *ex = &dev->ex_dev;
1064         int i;
1065         u8  *sub_sas_addr = NULL;
1066
1067         if (dev->dev_type != EDGE_DEV)
1068                 return 0;
1069
1070         for (i = 0; i < ex->num_phys; i++) {
1071                 struct ex_phy *phy = &ex->ex_phy[i];
1072
1073                 if (phy->phy_state == PHY_VACANT ||
1074                     phy->phy_state == PHY_NOT_PRESENT)
1075                         continue;
1076
1077                 if ((phy->attached_dev_type == FANOUT_DEV ||
1078                      phy->attached_dev_type == EDGE_DEV) &&
1079                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1080
1081                         if (!sub_sas_addr)
1082                                 sub_sas_addr = &phy->attached_sas_addr[0];
1083                         else if (SAS_ADDR(sub_sas_addr) !=
1084                                  SAS_ADDR(phy->attached_sas_addr)) {
1085
1086                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1087                                             "diverges(%016llx) on subtractive "
1088                                             "boundary(%016llx). Disabled\n",
1089                                             SAS_ADDR(dev->sas_addr), i,
1090                                             SAS_ADDR(phy->attached_sas_addr),
1091                                             SAS_ADDR(sub_sas_addr));
1092                                 sas_ex_disable_phy(dev, i);
1093                         }
1094                 }
1095         }
1096         return 0;
1097 }
1098
1099 static void sas_print_parent_topology_bug(struct domain_device *child,
1100                                                  struct ex_phy *parent_phy,
1101                                                  struct ex_phy *child_phy)
1102 {
1103         static const char ra_char[] = {
1104                 [DIRECT_ROUTING] = 'D',
1105                 [SUBTRACTIVE_ROUTING] = 'S',
1106                 [TABLE_ROUTING] = 'T',
1107         };
1108         static const char *ex_type[] = {
1109                 [EDGE_DEV] = "edge",
1110                 [FANOUT_DEV] = "fanout",
1111         };
1112         struct domain_device *parent = child->parent;
1113
1114         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1115                    "has %c:%c routing link!\n",
1116
1117                    ex_type[parent->dev_type],
1118                    SAS_ADDR(parent->sas_addr),
1119                    parent_phy->phy_id,
1120
1121                    ex_type[child->dev_type],
1122                    SAS_ADDR(child->sas_addr),
1123                    child_phy->phy_id,
1124
1125                    ra_char[parent_phy->routing_attr],
1126                    ra_char[child_phy->routing_attr]);
1127 }
1128
1129 static int sas_check_eeds(struct domain_device *child,
1130                                  struct ex_phy *parent_phy,
1131                                  struct ex_phy *child_phy)
1132 {
1133         int res = 0;
1134         struct domain_device *parent = child->parent;
1135
1136         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1137                 res = -ENODEV;
1138                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1139                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1140                             SAS_ADDR(parent->sas_addr),
1141                             parent_phy->phy_id,
1142                             SAS_ADDR(child->sas_addr),
1143                             child_phy->phy_id,
1144                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1145         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1146                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1147                        SAS_ADDR_SIZE);
1148                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1149                        SAS_ADDR_SIZE);
1150         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1151                     SAS_ADDR(parent->sas_addr)) ||
1152                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1153                     SAS_ADDR(child->sas_addr)))
1154                    &&
1155                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1156                      SAS_ADDR(parent->sas_addr)) ||
1157                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1158                      SAS_ADDR(child->sas_addr))))
1159                 ;
1160         else {
1161                 res = -ENODEV;
1162                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1163                             "phy 0x%x link forms a third EEDS!\n",
1164                             SAS_ADDR(parent->sas_addr),
1165                             parent_phy->phy_id,
1166                             SAS_ADDR(child->sas_addr),
1167                             child_phy->phy_id);
1168         }
1169
1170         return res;
1171 }
1172
1173 /* Here we spill over 80 columns.  It is intentional.
1174  */
1175 static int sas_check_parent_topology(struct domain_device *child)
1176 {
1177         struct expander_device *child_ex = &child->ex_dev;
1178         struct expander_device *parent_ex;
1179         int i;
1180         int res = 0;
1181
1182         if (!child->parent)
1183                 return 0;
1184
1185         if (child->parent->dev_type != EDGE_DEV &&
1186             child->parent->dev_type != FANOUT_DEV)
1187                 return 0;
1188
1189         parent_ex = &child->parent->ex_dev;
1190
1191         for (i = 0; i < parent_ex->num_phys; i++) {
1192                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1193                 struct ex_phy *child_phy;
1194
1195                 if (parent_phy->phy_state == PHY_VACANT ||
1196                     parent_phy->phy_state == PHY_NOT_PRESENT)
1197                         continue;
1198
1199                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1200                         continue;
1201
1202                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1203
1204                 switch (child->parent->dev_type) {
1205                 case EDGE_DEV:
1206                         if (child->dev_type == FANOUT_DEV) {
1207                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1208                                     child_phy->routing_attr != TABLE_ROUTING) {
1209                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1210                                         res = -ENODEV;
1211                                 }
1212                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1213                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1214                                         res = sas_check_eeds(child, parent_phy, child_phy);
1215                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1216                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1217                                         res = -ENODEV;
1218                                 }
1219                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1220                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1221                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1222                                 res = -ENODEV;
1223                         }
1224                         break;
1225                 case FANOUT_DEV:
1226                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1227                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1228                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1229                                 res = -ENODEV;
1230                         }
1231                         break;
1232                 default:
1233                         break;
1234                 }
1235         }
1236
1237         return res;
1238 }
1239
1240 #define RRI_REQ_SIZE  16
1241 #define RRI_RESP_SIZE 44
1242
1243 static int sas_configure_present(struct domain_device *dev, int phy_id,
1244                                  u8 *sas_addr, int *index, int *present)
1245 {
1246         int i, res = 0;
1247         struct expander_device *ex = &dev->ex_dev;
1248         struct ex_phy *phy = &ex->ex_phy[phy_id];
1249         u8 *rri_req;
1250         u8 *rri_resp;
1251
1252         *present = 0;
1253         *index = 0;
1254
1255         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1256         if (!rri_req)
1257                 return -ENOMEM;
1258
1259         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1260         if (!rri_resp) {
1261                 kfree(rri_req);
1262                 return -ENOMEM;
1263         }
1264
1265         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1266         rri_req[9] = phy_id;
1267
1268         for (i = 0; i < ex->max_route_indexes ; i++) {
1269                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1270                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1271                                        RRI_RESP_SIZE);
1272                 if (res)
1273                         goto out;
1274                 res = rri_resp[2];
1275                 if (res == SMP_RESP_NO_INDEX) {
1276                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1277                                     "phy 0x%x index 0x%x\n",
1278                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1279                         goto out;
1280                 } else if (res != SMP_RESP_FUNC_ACC) {
1281                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1282                                     "result 0x%x\n", __func__,
1283                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1284                         goto out;
1285                 }
1286                 if (SAS_ADDR(sas_addr) != 0) {
1287                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1288                                 *index = i;
1289                                 if ((rri_resp[12] & 0x80) == 0x80)
1290                                         *present = 0;
1291                                 else
1292                                         *present = 1;
1293                                 goto out;
1294                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1295                                 *index = i;
1296                                 *present = 0;
1297                                 goto out;
1298                         }
1299                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1300                            phy->last_da_index < i) {
1301                         phy->last_da_index = i;
1302                         *index = i;
1303                         *present = 0;
1304                         goto out;
1305                 }
1306         }
1307         res = -1;
1308 out:
1309         kfree(rri_req);
1310         kfree(rri_resp);
1311         return res;
1312 }
1313
1314 #define CRI_REQ_SIZE  44
1315 #define CRI_RESP_SIZE  8
1316
1317 static int sas_configure_set(struct domain_device *dev, int phy_id,
1318                              u8 *sas_addr, int index, int include)
1319 {
1320         int res;
1321         u8 *cri_req;
1322         u8 *cri_resp;
1323
1324         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1325         if (!cri_req)
1326                 return -ENOMEM;
1327
1328         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1329         if (!cri_resp) {
1330                 kfree(cri_req);
1331                 return -ENOMEM;
1332         }
1333
1334         cri_req[1] = SMP_CONF_ROUTE_INFO;
1335         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1336         cri_req[9] = phy_id;
1337         if (SAS_ADDR(sas_addr) == 0 || !include)
1338                 cri_req[12] |= 0x80;
1339         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1340
1341         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1342                                CRI_RESP_SIZE);
1343         if (res)
1344                 goto out;
1345         res = cri_resp[2];
1346         if (res == SMP_RESP_NO_INDEX) {
1347                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1348                             "index 0x%x\n",
1349                             SAS_ADDR(dev->sas_addr), phy_id, index);
1350         }
1351 out:
1352         kfree(cri_req);
1353         kfree(cri_resp);
1354         return res;
1355 }
1356
1357 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1358                                     u8 *sas_addr, int include)
1359 {
1360         int index;
1361         int present;
1362         int res;
1363
1364         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1365         if (res)
1366                 return res;
1367         if (include ^ present)
1368                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1369
1370         return res;
1371 }
1372
1373 /**
1374  * sas_configure_parent -- configure routing table of parent
1375  * parent: parent expander
1376  * child: child expander
1377  * sas_addr: SAS port identifier of device directly attached to child
1378  */
1379 static int sas_configure_parent(struct domain_device *parent,
1380                                 struct domain_device *child,
1381                                 u8 *sas_addr, int include)
1382 {
1383         struct expander_device *ex_parent = &parent->ex_dev;
1384         int res = 0;
1385         int i;
1386
1387         if (parent->parent) {
1388                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1389                                            include);
1390                 if (res)
1391                         return res;
1392         }
1393
1394         if (ex_parent->conf_route_table == 0) {
1395                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1396                             SAS_ADDR(parent->sas_addr));
1397                 return 0;
1398         }
1399
1400         for (i = 0; i < ex_parent->num_phys; i++) {
1401                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1402
1403                 if ((phy->routing_attr == TABLE_ROUTING) &&
1404                     (SAS_ADDR(phy->attached_sas_addr) ==
1405                      SAS_ADDR(child->sas_addr))) {
1406                         res = sas_configure_phy(parent, i, sas_addr, include);
1407                         if (res)
1408                                 return res;
1409                 }
1410         }
1411
1412         return res;
1413 }
1414
1415 /**
1416  * sas_configure_routing -- configure routing
1417  * dev: expander device
1418  * sas_addr: port identifier of device directly attached to the expander device
1419  */
1420 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1421 {
1422         if (dev->parent)
1423                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1424         return 0;
1425 }
1426
1427 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1428 {
1429         if (dev->parent)
1430                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1431         return 0;
1432 }
1433
1434 /**
1435  * sas_discover_expander -- expander discovery
1436  * @ex: pointer to expander domain device
1437  *
1438  * See comment in sas_discover_sata().
1439  */
1440 static int sas_discover_expander(struct domain_device *dev)
1441 {
1442         int res;
1443
1444         res = sas_notify_lldd_dev_found(dev);
1445         if (res)
1446                 return res;
1447
1448         res = sas_ex_general(dev);
1449         if (res)
1450                 goto out_err;
1451         res = sas_ex_manuf_info(dev);
1452         if (res)
1453                 goto out_err;
1454
1455         res = sas_expander_discover(dev);
1456         if (res) {
1457                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1458                             SAS_ADDR(dev->sas_addr), res);
1459                 goto out_err;
1460         }
1461
1462         sas_check_ex_subtractive_boundary(dev);
1463         res = sas_check_parent_topology(dev);
1464         if (res)
1465                 goto out_err;
1466         return 0;
1467 out_err:
1468         sas_notify_lldd_dev_gone(dev);
1469         return res;
1470 }
1471
1472 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1473 {
1474         int res = 0;
1475         struct domain_device *dev;
1476
1477         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1478                 if (dev->dev_type == EDGE_DEV ||
1479                     dev->dev_type == FANOUT_DEV) {
1480                         struct sas_expander_device *ex =
1481                                 rphy_to_expander_device(dev->rphy);
1482
1483                         if (level == ex->level)
1484                                 res = sas_ex_discover_devices(dev, -1);
1485                         else if (level > 0)
1486                                 res = sas_ex_discover_devices(port->port_dev, -1);
1487
1488                 }
1489         }
1490
1491         return res;
1492 }
1493
1494 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1495 {
1496         int res;
1497         int level;
1498
1499         do {
1500                 level = port->disc.max_level;
1501                 res = sas_ex_level_discovery(port, level);
1502                 mb();
1503         } while (level < port->disc.max_level);
1504
1505         return res;
1506 }
1507
1508 int sas_discover_root_expander(struct domain_device *dev)
1509 {
1510         int res;
1511         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1512
1513         res = sas_rphy_add(dev->rphy);
1514         if (res)
1515                 goto out_err;
1516
1517         ex->level = dev->port->disc.max_level; /* 0 */
1518         res = sas_discover_expander(dev);
1519         if (res)
1520                 goto out_err2;
1521
1522         sas_ex_bfs_disc(dev->port);
1523
1524         return res;
1525
1526 out_err2:
1527         sas_rphy_remove(dev->rphy);
1528 out_err:
1529         return res;
1530 }
1531
1532 /* ---------- Domain revalidation ---------- */
1533
1534 static int sas_get_phy_discover(struct domain_device *dev,
1535                                 int phy_id, struct smp_resp *disc_resp)
1536 {
1537         int res;
1538         u8 *disc_req;
1539
1540         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1541         if (!disc_req)
1542                 return -ENOMEM;
1543
1544         disc_req[1] = SMP_DISCOVER;
1545         disc_req[9] = phy_id;
1546
1547         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1548                                disc_resp, DISCOVER_RESP_SIZE);
1549         if (res)
1550                 goto out;
1551         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1552                 res = disc_resp->result;
1553                 goto out;
1554         }
1555 out:
1556         kfree(disc_req);
1557         return res;
1558 }
1559
1560 static int sas_get_phy_change_count(struct domain_device *dev,
1561                                     int phy_id, int *pcc)
1562 {
1563         int res;
1564         struct smp_resp *disc_resp;
1565
1566         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1567         if (!disc_resp)
1568                 return -ENOMEM;
1569
1570         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1571         if (!res)
1572                 *pcc = disc_resp->disc.change_count;
1573
1574         kfree(disc_resp);
1575         return res;
1576 }
1577
1578 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1579                                          int phy_id, u8 *attached_sas_addr)
1580 {
1581         int res;
1582         struct smp_resp *disc_resp;
1583         struct discover_resp *dr;
1584
1585         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1586         if (!disc_resp)
1587                 return -ENOMEM;
1588         dr = &disc_resp->disc;
1589
1590         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1591         if (!res) {
1592                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1593                 if (dr->attached_dev_type == 0)
1594                         memset(attached_sas_addr, 0, 8);
1595         }
1596         kfree(disc_resp);
1597         return res;
1598 }
1599
1600 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1601                               int from_phy)
1602 {
1603         struct expander_device *ex = &dev->ex_dev;
1604         int res = 0;
1605         int i;
1606
1607         for (i = from_phy; i < ex->num_phys; i++) {
1608                 int phy_change_count = 0;
1609
1610                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1611                 if (res)
1612                         goto out;
1613                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1614                         ex->ex_phy[i].phy_change_count = phy_change_count;
1615                         *phy_id = i;
1616                         return 0;
1617                 }
1618         }
1619 out:
1620         return res;
1621 }
1622
1623 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1624 {
1625         int res;
1626         u8  *rg_req;
1627         struct smp_resp  *rg_resp;
1628
1629         rg_req = alloc_smp_req(RG_REQ_SIZE);
1630         if (!rg_req)
1631                 return -ENOMEM;
1632
1633         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1634         if (!rg_resp) {
1635                 kfree(rg_req);
1636                 return -ENOMEM;
1637         }
1638
1639         rg_req[1] = SMP_REPORT_GENERAL;
1640
1641         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1642                                RG_RESP_SIZE);
1643         if (res)
1644                 goto out;
1645         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1646                 res = rg_resp->result;
1647                 goto out;
1648         }
1649
1650         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1651 out:
1652         kfree(rg_resp);
1653         kfree(rg_req);
1654         return res;
1655 }
1656
1657 static int sas_find_bcast_dev(struct domain_device *dev,
1658                               struct domain_device **src_dev)
1659 {
1660         struct expander_device *ex = &dev->ex_dev;
1661         int ex_change_count = -1;
1662         int res;
1663
1664         res = sas_get_ex_change_count(dev, &ex_change_count);
1665         if (res)
1666                 goto out;
1667         if (ex_change_count != -1 &&
1668             ex_change_count != ex->ex_change_count) {
1669                 *src_dev = dev;
1670                 ex->ex_change_count = ex_change_count;
1671         } else {
1672                 struct domain_device *ch;
1673
1674                 list_for_each_entry(ch, &ex->children, siblings) {
1675                         if (ch->dev_type == EDGE_DEV ||
1676                             ch->dev_type == FANOUT_DEV) {
1677                                 res = sas_find_bcast_dev(ch, src_dev);
1678                                 if (src_dev)
1679                                         return res;
1680                         }
1681                 }
1682         }
1683 out:
1684         return res;
1685 }
1686
1687 static void sas_unregister_ex_tree(struct domain_device *dev)
1688 {
1689         struct expander_device *ex = &dev->ex_dev;
1690         struct domain_device *child, *n;
1691
1692         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1693                 if (child->dev_type == EDGE_DEV ||
1694                     child->dev_type == FANOUT_DEV)
1695                         sas_unregister_ex_tree(child);
1696                 else
1697                         sas_unregister_dev(child);
1698         }
1699         sas_unregister_dev(dev);
1700 }
1701
1702 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1703                                          int phy_id)
1704 {
1705         struct expander_device *ex_dev = &parent->ex_dev;
1706         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1707         struct domain_device *child, *n;
1708
1709         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1710                 if (SAS_ADDR(child->sas_addr) ==
1711                     SAS_ADDR(phy->attached_sas_addr)) {
1712                         if (child->dev_type == EDGE_DEV ||
1713                             child->dev_type == FANOUT_DEV)
1714                                 sas_unregister_ex_tree(child);
1715                         else
1716                                 sas_unregister_dev(child);
1717                         break;
1718                 }
1719         }
1720         sas_disable_routing(parent, phy->attached_sas_addr);
1721         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1722         sas_port_delete_phy(phy->port, phy->phy);
1723         if (phy->port->num_phys == 0)
1724                 sas_port_delete(phy->port);
1725         phy->port = NULL;
1726 }
1727
1728 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1729                                           const int level)
1730 {
1731         struct expander_device *ex_root = &root->ex_dev;
1732         struct domain_device *child;
1733         int res = 0;
1734
1735         list_for_each_entry(child, &ex_root->children, siblings) {
1736                 if (child->dev_type == EDGE_DEV ||
1737                     child->dev_type == FANOUT_DEV) {
1738                         struct sas_expander_device *ex =
1739                                 rphy_to_expander_device(child->rphy);
1740
1741                         if (level > ex->level)
1742                                 res = sas_discover_bfs_by_root_level(child,
1743                                                                      level);
1744                         else if (level == ex->level)
1745                                 res = sas_ex_discover_devices(child, -1);
1746                 }
1747         }
1748         return res;
1749 }
1750
1751 static int sas_discover_bfs_by_root(struct domain_device *dev)
1752 {
1753         int res;
1754         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1755         int level = ex->level+1;
1756
1757         res = sas_ex_discover_devices(dev, -1);
1758         if (res)
1759                 goto out;
1760         do {
1761                 res = sas_discover_bfs_by_root_level(dev, level);
1762                 mb();
1763                 level += 1;
1764         } while (level <= dev->port->disc.max_level);
1765 out:
1766         return res;
1767 }
1768
1769 static int sas_discover_new(struct domain_device *dev, int phy_id)
1770 {
1771         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1772         struct domain_device *child;
1773         int res;
1774
1775         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1776                     SAS_ADDR(dev->sas_addr), phy_id);
1777         res = sas_ex_phy_discover(dev, phy_id);
1778         if (res)
1779                 goto out;
1780         res = sas_ex_discover_devices(dev, phy_id);
1781         if (res)
1782                 goto out;
1783         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1784                 if (SAS_ADDR(child->sas_addr) ==
1785                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1786                         if (child->dev_type == EDGE_DEV ||
1787                             child->dev_type == FANOUT_DEV)
1788                                 res = sas_discover_bfs_by_root(child);
1789                         break;
1790                 }
1791         }
1792 out:
1793         return res;
1794 }
1795
1796 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1797 {
1798         struct expander_device *ex = &dev->ex_dev;
1799         struct ex_phy *phy = &ex->ex_phy[phy_id];
1800         u8 attached_sas_addr[8];
1801         int res;
1802
1803         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1804         switch (res) {
1805         case SMP_RESP_NO_PHY:
1806                 phy->phy_state = PHY_NOT_PRESENT;
1807                 sas_unregister_devs_sas_addr(dev, phy_id);
1808                 goto out; break;
1809         case SMP_RESP_PHY_VACANT:
1810                 phy->phy_state = PHY_VACANT;
1811                 sas_unregister_devs_sas_addr(dev, phy_id);
1812                 goto out; break;
1813         case SMP_RESP_FUNC_ACC:
1814                 break;
1815         }
1816
1817         if (SAS_ADDR(attached_sas_addr) == 0) {
1818                 phy->phy_state = PHY_EMPTY;
1819                 sas_unregister_devs_sas_addr(dev, phy_id);
1820         } else if (SAS_ADDR(attached_sas_addr) ==
1821                    SAS_ADDR(phy->attached_sas_addr)) {
1822                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1823                             SAS_ADDR(dev->sas_addr), phy_id);
1824                 sas_ex_phy_discover(dev, phy_id);
1825         } else
1826                 res = sas_discover_new(dev, phy_id);
1827 out:
1828         return res;
1829 }
1830
1831 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1832 {
1833         struct expander_device *ex = &dev->ex_dev;
1834         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1835         int res = 0;
1836         int i;
1837
1838         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1839                     SAS_ADDR(dev->sas_addr), phy_id);
1840
1841         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1842                 for (i = 0; i < ex->num_phys; i++) {
1843                         struct ex_phy *phy = &ex->ex_phy[i];
1844
1845                         if (i == phy_id)
1846                                 continue;
1847                         if (SAS_ADDR(phy->attached_sas_addr) ==
1848                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1849                                 SAS_DPRINTK("phy%d part of wide port with "
1850                                             "phy%d\n", phy_id, i);
1851                                 goto out;
1852                         }
1853                 }
1854                 res = sas_rediscover_dev(dev, phy_id);
1855         } else
1856                 res = sas_discover_new(dev, phy_id);
1857 out:
1858         return res;
1859 }
1860
1861 /**
1862  * sas_revalidate_domain -- revalidate the domain
1863  * @port: port to the domain of interest
1864  *
1865  * NOTE: this process _must_ quit (return) as soon as any connection
1866  * errors are encountered.  Connection recovery is done elsewhere.
1867  * Discover process only interrogates devices in order to discover the
1868  * domain.
1869  */
1870 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1871 {
1872         int res;
1873         struct domain_device *dev = NULL;
1874
1875         res = sas_find_bcast_dev(port_dev, &dev);
1876         if (res)
1877                 goto out;
1878         if (dev) {
1879                 struct expander_device *ex = &dev->ex_dev;
1880                 int i = 0, phy_id;
1881
1882                 do {
1883                         phy_id = -1;
1884                         res = sas_find_bcast_phy(dev, &phy_id, i);
1885                         if (phy_id == -1)
1886                                 break;
1887                         res = sas_rediscover(dev, phy_id);
1888                         i = phy_id + 1;
1889                 } while (i < ex->num_phys);
1890         }
1891 out:
1892         return res;
1893 }
1894
1895 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1896                     struct request *req)
1897 {
1898         struct domain_device *dev;
1899         int ret, type;
1900         struct request *rsp = req->next_rq;
1901
1902         if (!rsp) {
1903                 printk("%s: space for a smp response is missing\n",
1904                        __func__);
1905                 return -EINVAL;
1906         }
1907
1908         /* no rphy means no smp target support (ie aic94xx host) */
1909         if (!rphy)
1910                 return sas_smp_host_handler(shost, req, rsp);
1911
1912         type = rphy->identify.device_type;
1913
1914         if (type != SAS_EDGE_EXPANDER_DEVICE &&
1915             type != SAS_FANOUT_EXPANDER_DEVICE) {
1916                 printk("%s: can we send a smp request to a device?\n",
1917                        __func__);
1918                 return -EINVAL;
1919         }
1920
1921         dev = sas_find_dev_by_rphy(rphy);
1922         if (!dev) {
1923                 printk("%s: fail to find a domain_device?\n", __func__);
1924                 return -EINVAL;
1925         }
1926
1927         /* do we need to support multiple segments? */
1928         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
1929                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
1930                        __func__, req->bio->bi_vcnt, req->data_len,
1931                        rsp->bio->bi_vcnt, rsp->data_len);
1932                 return -EINVAL;
1933         }
1934
1935         ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
1936                                bio_data(rsp->bio), rsp->data_len);
1937         if (ret > 0) {
1938                 /* positive number is the untransferred residual */
1939                 rsp->data_len = ret;
1940                 req->data_len = 0;
1941                 ret = 0;
1942         } else if (ret == 0) {
1943                 rsp->data_len = 0;
1944                 req->data_len = 0;
1945         }
1946
1947         return ret;
1948 }