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         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 511         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 512         u8 *req = alloc_smp_req(RPEL_REQ_SIZE);
 513         u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);
 514
 515         if (!resp)
 516                 return -ENOMEM;
 517
 518         req[1] = SMP_REPORT_PHY_ERR_LOG;
 519         req[9] = phy->number;
 520
 521         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 522                                     resp, RPEL_RESP_SIZE);
 523
 524         if (!res)
 525                 goto out;
 526
 527         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 528         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 529         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 530         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 531
 532  out:
 533         kfree(resp);
 534         return res;
 535
 536 }
 537
 538 #define RPS_REQ_SIZE  16
 539 #define RPS_RESP_SIZE 60
 540
 541 static int sas_get_report_phy_sata(struct domain_device *dev,
 542                                           int phy_id,
 543                                           struct smp_resp *rps_resp)
 544 {
 545         int res;
 546         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 547         u8 *resp = (u8 *)rps_resp;
 548
 549         if (!rps_req)
 550                 return -ENOMEM;
 551
 552         rps_req[1] = SMP_REPORT_PHY_SATA;
 553         rps_req[9] = phy_id;
 554
 555         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 556                                     rps_resp, RPS_RESP_SIZE);
 557
 558         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 559          * standards cockup here.  sas-2 explicitly specifies the FIS
 560          * should be encoded so that FIS type is in resp[24].
 561          * However, some expanders endian reverse this.  Undo the
 562          * reversal here */
 563         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 564                 int i;
 565
 566                 for (i = 0; i < 5; i++) {
 567                         int j = 24 + (i*4);
 568                         u8 a, b;
 569                         a = resp[j + 0];
 570                         b = resp[j + 1];
 571                         resp[j + 0] = resp[j + 3];
 572                         resp[j + 1] = resp[j + 2];
 573                         resp[j + 2] = b;
 574                         resp[j + 3] = a;
 575                 }
 576         }
 577
 578         kfree(rps_req);
 579         return res;
 580 }
 581
 582 static void sas_ex_get_linkrate(struct domain_device *parent,
 583                                        struct domain_device *child,
 584                                        struct ex_phy *parent_phy)
 585 {
 586         struct expander_device *parent_ex = &parent->ex_dev;
 587         struct sas_port *port;
 588         int i;
 589
 590         child->pathways = 0;
 591
 592         port = parent_phy->port;
 593
 594         for (i = 0; i < parent_ex->num_phys; i++) {
 595                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 596
 597                 if (phy->phy_state == PHY_VACANT ||
 598                     phy->phy_state == PHY_NOT_PRESENT)
 599                         continue;
 600
 601                 if (SAS_ADDR(phy->attached_sas_addr) ==
 602                     SAS_ADDR(child->sas_addr)) {
 603
 604                         child->min_linkrate = min(parent->min_linkrate,
 605                                                   phy->linkrate);
 606                         child->max_linkrate = max(parent->max_linkrate,
 607                                                   phy->linkrate);
 608                         child->pathways++;
 609                         sas_port_add_phy(port, phy->phy);
 610                 }
 611         }
 612         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 613         child->pathways = min(child->pathways, parent->pathways);
 614 }
 615
 616 static struct domain_device *sas_ex_discover_end_dev(
 617         struct domain_device *parent, int phy_id)
 618 {
 619         struct expander_device *parent_ex = &parent->ex_dev;
 620         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 621         struct domain_device *child = NULL;
 622         struct sas_rphy *rphy;
 623         int res;
 624
 625         if (phy->attached_sata_host || phy->attached_sata_ps)
 626                 return NULL;
 627
 628         child = kzalloc(sizeof(*child), GFP_KERNEL);
 629         if (!child)
 630                 return NULL;
 631
 632         child->parent = parent;
 633         child->port   = parent->port;
 634         child->iproto = phy->attached_iproto;
 635         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 636         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 637         if (!phy->port) {
 638                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 639                 if (unlikely(!phy->port))
 640                         goto out_err;
 641                 if (unlikely(sas_port_add(phy->port) != 0)) {
 642                         sas_port_free(phy->port);
 643                         goto out_err;
 644                 }
 645         }
 646         sas_ex_get_linkrate(parent, child, phy);
 647
 648         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 649                 child->dev_type = SATA_DEV;
 650                 if (phy->attached_tproto & SAS_PROTO_STP)
 651                         child->tproto = phy->attached_tproto;
 652                 if (phy->attached_sata_dev)
 653                         child->tproto |= SATA_DEV;
 654                 res = sas_get_report_phy_sata(parent, phy_id,
 655                                               &child->sata_dev.rps_resp);
 656                 if (res) {
 657                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 658                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 659                                     phy_id, res);
 660                         goto out_free;
 661                 }
 662                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 663                        sizeof(struct dev_to_host_fis));
 664
 665                 rphy = sas_end_device_alloc(phy->port);
 666                 if (unlikely(!rphy))
 667                         goto out_free;
 668
 669                 sas_init_dev(child);
 670
 671                 child->rphy = rphy;
 672
 673                 spin_lock_irq(&parent->port->dev_list_lock);
 674                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 675                 spin_unlock_irq(&parent->port->dev_list_lock);
 676
 677                 res = sas_discover_sata(child);
 678                 if (res) {
 679                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 680                                     "%016llx:0x%x returned 0x%x\n",
 681                                     SAS_ADDR(child->sas_addr),
 682                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 683                         goto out_list_del;
 684                 }
 685         } else if (phy->attached_tproto & SAS_PROTO_SSP) {
 686                 child->dev_type = SAS_END_DEV;
 687                 rphy = sas_end_device_alloc(phy->port);
 688                 /* FIXME: error handling */
 689                 if (unlikely(!rphy))
 690                         goto out_free;
 691                 child->tproto = phy->attached_tproto;
 692                 sas_init_dev(child);
 693
 694                 child->rphy = rphy;
 695                 sas_fill_in_rphy(child, rphy);
 696
 697                 spin_lock_irq(&parent->port->dev_list_lock);
 698                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 699                 spin_unlock_irq(&parent->port->dev_list_lock);
 700
 701                 res = sas_discover_end_dev(child);
 702                 if (res) {
 703                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 704                                     "at %016llx:0x%x returned 0x%x\n",
 705                                     SAS_ADDR(child->sas_addr),
 706                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 707                         goto out_list_del;
 708                 }
 709         } else {
 710                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 711                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 712                             phy_id);
 713         }
 714
 715         list_add_tail(&child->siblings, &parent_ex->children);
 716         return child;
 717
 718  out_list_del:
 719         sas_rphy_free(child->rphy);
 720         child->rphy = NULL;
 721         list_del(&child->dev_list_node);
 722  out_free:
 723         sas_port_delete(phy->port);
 724  out_err:
 725         phy->port = NULL;
 726         kfree(child);
 727         return NULL;
 728 }
 729
 730 /* See if this phy is part of a wide port */
 731 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 732 {
 733         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 734         int i;
 735
 736         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 737                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 738
 739                 if (ephy == phy)
 740                         continue;
 741
 742                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 743                             SAS_ADDR_SIZE) && ephy->port) {
 744                         sas_port_add_phy(ephy->port, phy->phy);
 745                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 746                         return 0;
 747                 }
 748         }
 749
 750         return -ENODEV;
 751 }
 752
 753 static struct domain_device *sas_ex_discover_expander(
 754         struct domain_device *parent, int phy_id)
 755 {
 756         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 757         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 758         struct domain_device *child = NULL;
 759         struct sas_rphy *rphy;
 760         struct sas_expander_device *edev;
 761         struct asd_sas_port *port;
 762         int res;
 763
 764         if (phy->routing_attr == DIRECT_ROUTING) {
 765                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 766                             "allowed\n",
 767                             SAS_ADDR(parent->sas_addr), phy_id,
 768                             SAS_ADDR(phy->attached_sas_addr),
 769                             phy->attached_phy_id);
 770                 return NULL;
 771         }
 772         child = kzalloc(sizeof(*child), GFP_KERNEL);
 773         if (!child)
 774                 return NULL;
 775
 776         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 777         /* FIXME: better error handling */
 778         BUG_ON(sas_port_add(phy->port) != 0);
 779
 780
 781         switch (phy->attached_dev_type) {
 782         case EDGE_DEV:
 783                 rphy = sas_expander_alloc(phy->port,
 784                                           SAS_EDGE_EXPANDER_DEVICE);
 785                 break;
 786         case FANOUT_DEV:
 787                 rphy = sas_expander_alloc(phy->port,
 788                                           SAS_FANOUT_EXPANDER_DEVICE);
 789                 break;
 790         default:
 791                 rphy = NULL;    /* shut gcc up */
 792                 BUG();
 793         }
 794         port = parent->port;
 795         child->rphy = rphy;
 796         edev = rphy_to_expander_device(rphy);
 797         child->dev_type = phy->attached_dev_type;
 798         child->parent = parent;
 799         child->port = port;
 800         child->iproto = phy->attached_iproto;
 801         child->tproto = phy->attached_tproto;
 802         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 803         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 804         sas_ex_get_linkrate(parent, child, phy);
 805         edev->level = parent_ex->level + 1;
 806         parent->port->disc.max_level = max(parent->port->disc.max_level,
 807                                            edev->level);
 808         sas_init_dev(child);
 809         sas_fill_in_rphy(child, rphy);
 810         sas_rphy_add(rphy);
 811
 812         spin_lock_irq(&parent->port->dev_list_lock);
 813         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 814         spin_unlock_irq(&parent->port->dev_list_lock);
 815
 816         res = sas_discover_expander(child);
 817         if (res) {
 818                 kfree(child);
 819                 return NULL;
 820         }
 821         list_add_tail(&child->siblings, &parent->ex_dev.children);
 822         return child;
 823 }
 824
 825 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 826 {
 827         struct expander_device *ex = &dev->ex_dev;
 828         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 829         struct domain_device *child = NULL;
 830         int res = 0;
 831
 832         /* Phy state */
 833         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 834                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 835                         res = sas_ex_phy_discover(dev, phy_id);
 836                 if (res)
 837                         return res;
 838         }
 839
 840         /* Parent and domain coherency */
 841         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 842                              SAS_ADDR(dev->port->sas_addr))) {
 843                 sas_add_parent_port(dev, phy_id);
 844                 return 0;
 845         }
 846         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 847                             SAS_ADDR(dev->parent->sas_addr))) {
 848                 sas_add_parent_port(dev, phy_id);
 849                 if (ex_phy->routing_attr == TABLE_ROUTING)
 850                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 851                 return 0;
 852         }
 853
 854         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 855                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 856
 857         if (ex_phy->attached_dev_type == NO_DEVICE) {
 858                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 859                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 860                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 861                 }
 862                 return 0;
 863         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 864                 return 0;
 865
 866         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 867             ex_phy->attached_dev_type != FANOUT_DEV &&
 868             ex_phy->attached_dev_type != EDGE_DEV) {
 869                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 870                             "phy 0x%x\n", ex_phy->attached_dev_type,
 871                             SAS_ADDR(dev->sas_addr),
 872                             phy_id);
 873                 return 0;
 874         }
 875
 876         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 877         if (res) {
 878                 SAS_DPRINTK("configure routing for dev %016llx "
 879                             "reported 0x%x. Forgotten\n",
 880                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 881                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 882                 return res;
 883         }
 884
 885         res = sas_ex_join_wide_port(dev, phy_id);
 886         if (!res) {
 887                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 888                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 889                 return res;
 890         }
 891
 892         switch (ex_phy->attached_dev_type) {
 893         case SAS_END_DEV:
 894                 child = sas_ex_discover_end_dev(dev, phy_id);
 895                 break;
 896         case FANOUT_DEV:
 897                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 898                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 899                                     "attached to ex %016llx phy 0x%x\n",
 900                                     SAS_ADDR(ex_phy->attached_sas_addr),
 901                                     ex_phy->attached_phy_id,
 902                                     SAS_ADDR(dev->sas_addr),
 903                                     phy_id);
 904                         sas_ex_disable_phy(dev, phy_id);
 905                         break;
 906                 } else
 907                         memcpy(dev->port->disc.fanout_sas_addr,
 908                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 909                 /* fallthrough */
 910         case EDGE_DEV:
 911                 child = sas_ex_discover_expander(dev, phy_id);
 912                 break;
 913         default:
 914                 break;
 915         }
 916
 917         if (child) {
 918                 int i;
 919
 920                 for (i = 0; i < ex->num_phys; i++) {
 921                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 922                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 923                                 continue;
 924
 925                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 926                             SAS_ADDR(child->sas_addr))
 927                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 928                 }
 929         }
 930
 931         return res;
 932 }
 933
 934 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 935 {
 936         struct expander_device *ex = &dev->ex_dev;
 937         int i;
 938
 939         for (i = 0; i < ex->num_phys; i++) {
 940                 struct ex_phy *phy = &ex->ex_phy[i];
 941
 942                 if (phy->phy_state == PHY_VACANT ||
 943                     phy->phy_state == PHY_NOT_PRESENT)
 944                         continue;
 945
 946                 if ((phy->attached_dev_type == EDGE_DEV ||
 947                      phy->attached_dev_type == FANOUT_DEV) &&
 948                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 949
 950                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 951
 952                         return 1;
 953                 }
 954         }
 955         return 0;
 956 }
 957
 958 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 959 {
 960         struct expander_device *ex = &dev->ex_dev;
 961         struct domain_device *child;
 962         u8 sub_addr[8] = {0, };
 963
 964         list_for_each_entry(child, &ex->children, siblings) {
 965                 if (child->dev_type != EDGE_DEV &&
 966                     child->dev_type != FANOUT_DEV)
 967                         continue;
 968                 if (sub_addr[0] == 0) {
 969                         sas_find_sub_addr(child, sub_addr);
 970                         continue;
 971                 } else {
 972                         u8 s2[8];
 973
 974                         if (sas_find_sub_addr(child, s2) &&
 975                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 976
 977                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 978                                             "diverges from subtractive "
 979                                             "boundary %016llx\n",
 980                                             SAS_ADDR(dev->sas_addr),
 981                                             SAS_ADDR(child->sas_addr),
 982                                             SAS_ADDR(s2),
 983                                             SAS_ADDR(sub_addr));
 984
 985                                 sas_ex_disable_port(child, s2);
 986                         }
 987                 }
 988         }
 989         return 0;
 990 }
 991 /**
 992  * sas_ex_discover_devices -- discover devices attached to this expander
 993  * dev: pointer to the expander domain device
 994  * single: if you want to do a single phy, else set to -1;
 995  *
 996  * Configure this expander for use with its devices and register the
 997  * devices of this expander.
 998  */
 999 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1000 {
1001         struct expander_device *ex = &dev->ex_dev;
1002         int i = 0, end = ex->num_phys;
1003         int res = 0;
1004
1005         if (0 <= single && single < end) {
1006                 i = single;
1007                 end = i+1;
1008         }
1009
1010         for ( ; i < end; i++) {
1011                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1012
1013                 if (ex_phy->phy_state == PHY_VACANT ||
1014                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1015                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1016                         continue;
1017
1018                 switch (ex_phy->linkrate) {
1019                 case SAS_PHY_DISABLED:
1020                 case SAS_PHY_RESET_PROBLEM:
1021                 case SAS_SATA_PORT_SELECTOR:
1022                         continue;
1023                 default:
1024                         res = sas_ex_discover_dev(dev, i);
1025                         if (res)
1026                                 break;
1027                         continue;
1028                 }
1029         }
1030
1031         if (!res)
1032                 sas_check_level_subtractive_boundary(dev);
1033
1034         return res;
1035 }
1036
1037 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1038 {
1039         struct expander_device *ex = &dev->ex_dev;
1040         int i;
1041         u8  *sub_sas_addr = NULL;
1042
1043         if (dev->dev_type != EDGE_DEV)
1044                 return 0;
1045
1046         for (i = 0; i < ex->num_phys; i++) {
1047                 struct ex_phy *phy = &ex->ex_phy[i];
1048
1049                 if (phy->phy_state == PHY_VACANT ||
1050                     phy->phy_state == PHY_NOT_PRESENT)
1051                         continue;
1052
1053                 if ((phy->attached_dev_type == FANOUT_DEV ||
1054                      phy->attached_dev_type == EDGE_DEV) &&
1055                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1056
1057                         if (!sub_sas_addr)
1058                                 sub_sas_addr = &phy->attached_sas_addr[0];
1059                         else if (SAS_ADDR(sub_sas_addr) !=
1060                                  SAS_ADDR(phy->attached_sas_addr)) {
1061
1062                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1063                                             "diverges(%016llx) on subtractive "
1064                                             "boundary(%016llx). Disabled\n",
1065                                             SAS_ADDR(dev->sas_addr), i,
1066                                             SAS_ADDR(phy->attached_sas_addr),
1067                                             SAS_ADDR(sub_sas_addr));
1068                                 sas_ex_disable_phy(dev, i);
1069                         }
1070                 }
1071         }
1072         return 0;
1073 }
1074
1075 static void sas_print_parent_topology_bug(struct domain_device *child,
1076                                                  struct ex_phy *parent_phy,
1077                                                  struct ex_phy *child_phy)
1078 {
1079         static const char ra_char[] = {
1080                 [DIRECT_ROUTING] = 'D',
1081                 [SUBTRACTIVE_ROUTING] = 'S',
1082                 [TABLE_ROUTING] = 'T',
1083         };
1084         static const char *ex_type[] = {
1085                 [EDGE_DEV] = "edge",
1086                 [FANOUT_DEV] = "fanout",
1087         };
1088         struct domain_device *parent = child->parent;
1089
1090         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1091                    "has %c:%c routing link!\n",
1092
1093                    ex_type[parent->dev_type],
1094                    SAS_ADDR(parent->sas_addr),
1095                    parent_phy->phy_id,
1096
1097                    ex_type[child->dev_type],
1098                    SAS_ADDR(child->sas_addr),
1099                    child_phy->phy_id,
1100
1101                    ra_char[parent_phy->routing_attr],
1102                    ra_char[child_phy->routing_attr]);
1103 }
1104
1105 static int sas_check_eeds(struct domain_device *child,
1106                                  struct ex_phy *parent_phy,
1107                                  struct ex_phy *child_phy)
1108 {
1109         int res = 0;
1110         struct domain_device *parent = child->parent;
1111
1112         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1113                 res = -ENODEV;
1114                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1115                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1116                             SAS_ADDR(parent->sas_addr),
1117                             parent_phy->phy_id,
1118                             SAS_ADDR(child->sas_addr),
1119                             child_phy->phy_id,
1120                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1121         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1122                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1123                        SAS_ADDR_SIZE);
1124                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1125                        SAS_ADDR_SIZE);
1126         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1127                     SAS_ADDR(parent->sas_addr)) ||
1128                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1129                     SAS_ADDR(child->sas_addr)))
1130                    &&
1131                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1132                      SAS_ADDR(parent->sas_addr)) ||
1133                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1134                      SAS_ADDR(child->sas_addr))))
1135                 ;
1136         else {
1137                 res = -ENODEV;
1138                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1139                             "phy 0x%x link forms a third EEDS!\n",
1140                             SAS_ADDR(parent->sas_addr),
1141                             parent_phy->phy_id,
1142                             SAS_ADDR(child->sas_addr),
1143                             child_phy->phy_id);
1144         }
1145
1146         return res;
1147 }
1148
1149 /* Here we spill over 80 columns.  It is intentional.
1150  */
1151 static int sas_check_parent_topology(struct domain_device *child)
1152 {
1153         struct expander_device *child_ex = &child->ex_dev;
1154         struct expander_device *parent_ex;
1155         int i;
1156         int res = 0;
1157
1158         if (!child->parent)
1159                 return 0;
1160
1161         if (child->parent->dev_type != EDGE_DEV &&
1162             child->parent->dev_type != FANOUT_DEV)
1163                 return 0;
1164
1165         parent_ex = &child->parent->ex_dev;
1166
1167         for (i = 0; i < parent_ex->num_phys; i++) {
1168                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1169                 struct ex_phy *child_phy;
1170
1171                 if (parent_phy->phy_state == PHY_VACANT ||
1172                     parent_phy->phy_state == PHY_NOT_PRESENT)
1173                         continue;
1174
1175                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1176                         continue;
1177
1178                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1179
1180                 switch (child->parent->dev_type) {
1181                 case EDGE_DEV:
1182                         if (child->dev_type == FANOUT_DEV) {
1183                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1184                                     child_phy->routing_attr != TABLE_ROUTING) {
1185                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1186                                         res = -ENODEV;
1187                                 }
1188                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1189                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1190                                         res = sas_check_eeds(child, parent_phy, child_phy);
1191                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1192                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1193                                         res = -ENODEV;
1194                                 }
1195                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1196                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1197                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1198                                 res = -ENODEV;
1199                         }
1200                         break;
1201                 case FANOUT_DEV:
1202                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1203                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1204                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1205                                 res = -ENODEV;
1206                         }
1207                         break;
1208                 default:
1209                         break;
1210                 }
1211         }
1212
1213         return res;
1214 }
1215
1216 #define RRI_REQ_SIZE  16
1217 #define RRI_RESP_SIZE 44
1218
1219 static int sas_configure_present(struct domain_device *dev, int phy_id,
1220                                  u8 *sas_addr, int *index, int *present)
1221 {
1222         int i, res = 0;
1223         struct expander_device *ex = &dev->ex_dev;
1224         struct ex_phy *phy = &ex->ex_phy[phy_id];
1225         u8 *rri_req;
1226         u8 *rri_resp;
1227
1228         *present = 0;
1229         *index = 0;
1230
1231         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1232         if (!rri_req)
1233                 return -ENOMEM;
1234
1235         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1236         if (!rri_resp) {
1237                 kfree(rri_req);
1238                 return -ENOMEM;
1239         }
1240
1241         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1242         rri_req[9] = phy_id;
1243
1244         for (i = 0; i < ex->max_route_indexes ; i++) {
1245                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1246                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1247                                        RRI_RESP_SIZE);
1248                 if (res)
1249                         goto out;
1250                 res = rri_resp[2];
1251                 if (res == SMP_RESP_NO_INDEX) {
1252                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1253                                     "phy 0x%x index 0x%x\n",
1254                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1255                         goto out;
1256                 } else if (res != SMP_RESP_FUNC_ACC) {
1257                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1258                                     "result 0x%x\n", __FUNCTION__,
1259                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1260                         goto out;
1261                 }
1262                 if (SAS_ADDR(sas_addr) != 0) {
1263                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1264                                 *index = i;
1265                                 if ((rri_resp[12] & 0x80) == 0x80)
1266                                         *present = 0;
1267                                 else
1268                                         *present = 1;
1269                                 goto out;
1270                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1271                                 *index = i;
1272                                 *present = 0;
1273                                 goto out;
1274                         }
1275                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1276                            phy->last_da_index < i) {
1277                         phy->last_da_index = i;
1278                         *index = i;
1279                         *present = 0;
1280                         goto out;
1281                 }
1282         }
1283         res = -1;
1284 out:
1285         kfree(rri_req);
1286         kfree(rri_resp);
1287         return res;
1288 }
1289
1290 #define CRI_REQ_SIZE  44
1291 #define CRI_RESP_SIZE  8
1292
1293 static int sas_configure_set(struct domain_device *dev, int phy_id,
1294                              u8 *sas_addr, int index, int include)
1295 {
1296         int res;
1297         u8 *cri_req;
1298         u8 *cri_resp;
1299
1300         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1301         if (!cri_req)
1302                 return -ENOMEM;
1303
1304         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1305         if (!cri_resp) {
1306                 kfree(cri_req);
1307                 return -ENOMEM;
1308         }
1309
1310         cri_req[1] = SMP_CONF_ROUTE_INFO;
1311         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1312         cri_req[9] = phy_id;
1313         if (SAS_ADDR(sas_addr) == 0 || !include)
1314                 cri_req[12] |= 0x80;
1315         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1316
1317         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1318                                CRI_RESP_SIZE);
1319         if (res)
1320                 goto out;
1321         res = cri_resp[2];
1322         if (res == SMP_RESP_NO_INDEX) {
1323                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1324                             "index 0x%x\n",
1325                             SAS_ADDR(dev->sas_addr), phy_id, index);
1326         }
1327 out:
1328         kfree(cri_req);
1329         kfree(cri_resp);
1330         return res;
1331 }
1332
1333 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1334                                     u8 *sas_addr, int include)
1335 {
1336         int index;
1337         int present;
1338         int res;
1339
1340         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1341         if (res)
1342                 return res;
1343         if (include ^ present)
1344                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1345
1346         return res;
1347 }
1348
1349 /**
1350  * sas_configure_parent -- configure routing table of parent
1351  * parent: parent expander
1352  * child: child expander
1353  * sas_addr: SAS port identifier of device directly attached to child
1354  */
1355 static int sas_configure_parent(struct domain_device *parent,
1356                                 struct domain_device *child,
1357                                 u8 *sas_addr, int include)
1358 {
1359         struct expander_device *ex_parent = &parent->ex_dev;
1360         int res = 0;
1361         int i;
1362
1363         if (parent->parent) {
1364                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1365                                            include);
1366                 if (res)
1367                         return res;
1368         }
1369
1370         if (ex_parent->conf_route_table == 0) {
1371                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1372                             SAS_ADDR(parent->sas_addr));
1373                 return 0;
1374         }
1375
1376         for (i = 0; i < ex_parent->num_phys; i++) {
1377                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1378
1379                 if ((phy->routing_attr == TABLE_ROUTING) &&
1380                     (SAS_ADDR(phy->attached_sas_addr) ==
1381                      SAS_ADDR(child->sas_addr))) {
1382                         res = sas_configure_phy(parent, i, sas_addr, include);
1383                         if (res)
1384                                 return res;
1385                 }
1386         }
1387
1388         return res;
1389 }
1390
1391 /**
1392  * sas_configure_routing -- configure routing
1393  * dev: expander device
1394  * sas_addr: port identifier of device directly attached to the expander device
1395  */
1396 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1397 {
1398         if (dev->parent)
1399                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1400         return 0;
1401 }
1402
1403 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1404 {
1405         if (dev->parent)
1406                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1407         return 0;
1408 }
1409
1410 /**
1411  * sas_discover_expander -- expander discovery
1412  * @ex: pointer to expander domain device
1413  *
1414  * See comment in sas_discover_sata().
1415  */
1416 static int sas_discover_expander(struct domain_device *dev)
1417 {
1418         int res;
1419
1420         res = sas_notify_lldd_dev_found(dev);
1421         if (res)
1422                 return res;
1423
1424         res = sas_ex_general(dev);
1425         if (res)
1426                 goto out_err;
1427         res = sas_ex_manuf_info(dev);
1428         if (res)
1429                 goto out_err;
1430
1431         res = sas_expander_discover(dev);
1432         if (res) {
1433                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1434                             SAS_ADDR(dev->sas_addr), res);
1435                 goto out_err;
1436         }
1437
1438         sas_check_ex_subtractive_boundary(dev);
1439         res = sas_check_parent_topology(dev);
1440         if (res)
1441                 goto out_err;
1442         return 0;
1443 out_err:
1444         sas_notify_lldd_dev_gone(dev);
1445         return res;
1446 }
1447
1448 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1449 {
1450         int res = 0;
1451         struct domain_device *dev;
1452
1453         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1454                 if (dev->dev_type == EDGE_DEV ||
1455                     dev->dev_type == FANOUT_DEV) {
1456                         struct sas_expander_device *ex =
1457                                 rphy_to_expander_device(dev->rphy);
1458
1459                         if (level == ex->level)
1460                                 res = sas_ex_discover_devices(dev, -1);
1461                         else if (level > 0)
1462                                 res = sas_ex_discover_devices(port->port_dev, -1);
1463
1464                 }
1465         }
1466
1467         return res;
1468 }
1469
1470 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1471 {
1472         int res;
1473         int level;
1474
1475         do {
1476                 level = port->disc.max_level;
1477                 res = sas_ex_level_discovery(port, level);
1478                 mb();
1479         } while (level < port->disc.max_level);
1480
1481         return res;
1482 }
1483
1484 int sas_discover_root_expander(struct domain_device *dev)
1485 {
1486         int res;
1487         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1488
1489         res = sas_rphy_add(dev->rphy);
1490         if (res)
1491                 goto out_err;
1492
1493         ex->level = dev->port->disc.max_level; /* 0 */
1494         res = sas_discover_expander(dev);
1495         if (res)
1496                 goto out_err2;
1497
1498         sas_ex_bfs_disc(dev->port);
1499
1500         return res;
1501
1502 out_err2:
1503         sas_rphy_remove(dev->rphy);
1504 out_err:
1505         return res;
1506 }
1507
1508 /* ---------- Domain revalidation ---------- */
1509
1510 static int sas_get_phy_discover(struct domain_device *dev,
1511                                 int phy_id, struct smp_resp *disc_resp)
1512 {
1513         int res;
1514         u8 *disc_req;
1515
1516         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1517         if (!disc_req)
1518                 return -ENOMEM;
1519
1520         disc_req[1] = SMP_DISCOVER;
1521         disc_req[9] = phy_id;
1522
1523         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1524                                disc_resp, DISCOVER_RESP_SIZE);
1525         if (res)
1526                 goto out;
1527         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1528                 res = disc_resp->result;
1529                 goto out;
1530         }
1531 out:
1532         kfree(disc_req);
1533         return res;
1534 }
1535
1536 static int sas_get_phy_change_count(struct domain_device *dev,
1537                                     int phy_id, int *pcc)
1538 {
1539         int res;
1540         struct smp_resp *disc_resp;
1541
1542         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1543         if (!disc_resp)
1544                 return -ENOMEM;
1545
1546         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1547         if (!res)
1548                 *pcc = disc_resp->disc.change_count;
1549
1550         kfree(disc_resp);
1551         return res;
1552 }
1553
1554 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1555                                          int phy_id, u8 *attached_sas_addr)
1556 {
1557         int res;
1558         struct smp_resp *disc_resp;
1559         struct discover_resp *dr;
1560
1561         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1562         if (!disc_resp)
1563                 return -ENOMEM;
1564         dr = &disc_resp->disc;
1565
1566         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1567         if (!res) {
1568                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1569                 if (dr->attached_dev_type == 0)
1570                         memset(attached_sas_addr, 0, 8);
1571         }
1572         kfree(disc_resp);
1573         return res;
1574 }
1575
1576 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1577                               int from_phy)
1578 {
1579         struct expander_device *ex = &dev->ex_dev;
1580         int res = 0;
1581         int i;
1582
1583         for (i = from_phy; i < ex->num_phys; i++) {
1584                 int phy_change_count = 0;
1585
1586                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1587                 if (res)
1588                         goto out;
1589                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1590                         ex->ex_phy[i].phy_change_count = phy_change_count;
1591                         *phy_id = i;
1592                         return 0;
1593                 }
1594         }
1595 out:
1596         return res;
1597 }
1598
1599 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1600 {
1601         int res;
1602         u8  *rg_req;
1603         struct smp_resp  *rg_resp;
1604
1605         rg_req = alloc_smp_req(RG_REQ_SIZE);
1606         if (!rg_req)
1607                 return -ENOMEM;
1608
1609         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1610         if (!rg_resp) {
1611                 kfree(rg_req);
1612                 return -ENOMEM;
1613         }
1614
1615         rg_req[1] = SMP_REPORT_GENERAL;
1616
1617         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1618                                RG_RESP_SIZE);
1619         if (res)
1620                 goto out;
1621         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1622                 res = rg_resp->result;
1623                 goto out;
1624         }
1625
1626         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1627 out:
1628         kfree(rg_resp);
1629         kfree(rg_req);
1630         return res;
1631 }
1632
1633 static int sas_find_bcast_dev(struct domain_device *dev,
1634                               struct domain_device **src_dev)
1635 {
1636         struct expander_device *ex = &dev->ex_dev;
1637         int ex_change_count = -1;
1638         int res;
1639
1640         res = sas_get_ex_change_count(dev, &ex_change_count);
1641         if (res)
1642                 goto out;
1643         if (ex_change_count != -1 &&
1644             ex_change_count != ex->ex_change_count) {
1645                 *src_dev = dev;
1646                 ex->ex_change_count = ex_change_count;
1647         } else {
1648                 struct domain_device *ch;
1649
1650                 list_for_each_entry(ch, &ex->children, siblings) {
1651                         if (ch->dev_type == EDGE_DEV ||
1652                             ch->dev_type == FANOUT_DEV) {
1653                                 res = sas_find_bcast_dev(ch, src_dev);
1654                                 if (src_dev)
1655                                         return res;
1656                         }
1657                 }
1658         }
1659 out:
1660         return res;
1661 }
1662
1663 static void sas_unregister_ex_tree(struct domain_device *dev)
1664 {
1665         struct expander_device *ex = &dev->ex_dev;
1666         struct domain_device *child, *n;
1667
1668         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1669                 if (child->dev_type == EDGE_DEV ||
1670                     child->dev_type == FANOUT_DEV)
1671                         sas_unregister_ex_tree(child);
1672                 else
1673                         sas_unregister_dev(child);
1674         }
1675         sas_unregister_dev(dev);
1676 }
1677
1678 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1679                                          int phy_id)
1680 {
1681         struct expander_device *ex_dev = &parent->ex_dev;
1682         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1683         struct domain_device *child, *n;
1684
1685         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1686                 if (SAS_ADDR(child->sas_addr) ==
1687                     SAS_ADDR(phy->attached_sas_addr)) {
1688                         if (child->dev_type == EDGE_DEV ||
1689                             child->dev_type == FANOUT_DEV)
1690                                 sas_unregister_ex_tree(child);
1691                         else
1692                                 sas_unregister_dev(child);
1693                         break;
1694                 }
1695         }
1696         sas_disable_routing(parent, phy->attached_sas_addr);
1697         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1698         sas_port_delete_phy(phy->port, phy->phy);
1699         if (phy->port->num_phys == 0)
1700                 sas_port_delete(phy->port);
1701         phy->port = NULL;
1702 }
1703
1704 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1705                                           const int level)
1706 {
1707         struct expander_device *ex_root = &root->ex_dev;
1708         struct domain_device *child;
1709         int res = 0;
1710
1711         list_for_each_entry(child, &ex_root->children, siblings) {
1712                 if (child->dev_type == EDGE_DEV ||
1713                     child->dev_type == FANOUT_DEV) {
1714                         struct sas_expander_device *ex =
1715                                 rphy_to_expander_device(child->rphy);
1716
1717                         if (level > ex->level)
1718                                 res = sas_discover_bfs_by_root_level(child,
1719                                                                      level);
1720                         else if (level == ex->level)
1721                                 res = sas_ex_discover_devices(child, -1);
1722                 }
1723         }
1724         return res;
1725 }
1726
1727 static int sas_discover_bfs_by_root(struct domain_device *dev)
1728 {
1729         int res;
1730         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1731         int level = ex->level+1;
1732
1733         res = sas_ex_discover_devices(dev, -1);
1734         if (res)
1735                 goto out;
1736         do {
1737                 res = sas_discover_bfs_by_root_level(dev, level);
1738                 mb();
1739                 level += 1;
1740         } while (level <= dev->port->disc.max_level);
1741 out:
1742         return res;
1743 }
1744
1745 static int sas_discover_new(struct domain_device *dev, int phy_id)
1746 {
1747         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1748         struct domain_device *child;
1749         int res;
1750
1751         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1752                     SAS_ADDR(dev->sas_addr), phy_id);
1753         res = sas_ex_phy_discover(dev, phy_id);
1754         if (res)
1755                 goto out;
1756         res = sas_ex_discover_devices(dev, phy_id);
1757         if (res)
1758                 goto out;
1759         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1760                 if (SAS_ADDR(child->sas_addr) ==
1761                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1762                         if (child->dev_type == EDGE_DEV ||
1763                             child->dev_type == FANOUT_DEV)
1764                                 res = sas_discover_bfs_by_root(child);
1765                         break;
1766                 }
1767         }
1768 out:
1769         return res;
1770 }
1771
1772 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1773 {
1774         struct expander_device *ex = &dev->ex_dev;
1775         struct ex_phy *phy = &ex->ex_phy[phy_id];
1776         u8 attached_sas_addr[8];
1777         int res;
1778
1779         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1780         switch (res) {
1781         case SMP_RESP_NO_PHY:
1782                 phy->phy_state = PHY_NOT_PRESENT;
1783                 sas_unregister_devs_sas_addr(dev, phy_id);
1784                 goto out; break;
1785         case SMP_RESP_PHY_VACANT:
1786                 phy->phy_state = PHY_VACANT;
1787                 sas_unregister_devs_sas_addr(dev, phy_id);
1788                 goto out; break;
1789         case SMP_RESP_FUNC_ACC:
1790                 break;
1791         }
1792
1793         if (SAS_ADDR(attached_sas_addr) == 0) {
1794                 phy->phy_state = PHY_EMPTY;
1795                 sas_unregister_devs_sas_addr(dev, phy_id);
1796         } else if (SAS_ADDR(attached_sas_addr) ==
1797                    SAS_ADDR(phy->attached_sas_addr)) {
1798                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1799                             SAS_ADDR(dev->sas_addr), phy_id);
1800                 sas_ex_phy_discover(dev, phy_id);
1801         } else
1802                 res = sas_discover_new(dev, phy_id);
1803 out:
1804         return res;
1805 }
1806
1807 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1808 {
1809         struct expander_device *ex = &dev->ex_dev;
1810         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1811         int res = 0;
1812         int i;
1813
1814         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1815                     SAS_ADDR(dev->sas_addr), phy_id);
1816
1817         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1818                 for (i = 0; i < ex->num_phys; i++) {
1819                         struct ex_phy *phy = &ex->ex_phy[i];
1820
1821                         if (i == phy_id)
1822                                 continue;
1823                         if (SAS_ADDR(phy->attached_sas_addr) ==
1824                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1825                                 SAS_DPRINTK("phy%d part of wide port with "
1826                                             "phy%d\n", phy_id, i);
1827                                 goto out;
1828                         }
1829                 }
1830                 res = sas_rediscover_dev(dev, phy_id);
1831         } else
1832                 res = sas_discover_new(dev, phy_id);
1833 out:
1834         return res;
1835 }
1836
1837 /**
1838  * sas_revalidate_domain -- revalidate the domain
1839  * @port: port to the domain of interest
1840  *
1841  * NOTE: this process _must_ quit (return) as soon as any connection
1842  * errors are encountered.  Connection recovery is done elsewhere.
1843  * Discover process only interrogates devices in order to discover the
1844  * domain.
1845  */
1846 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1847 {
1848         int res;
1849         struct domain_device *dev = NULL;
1850
1851         res = sas_find_bcast_dev(port_dev, &dev);
1852         if (res)
1853                 goto out;
1854         if (dev) {
1855                 struct expander_device *ex = &dev->ex_dev;
1856                 int i = 0, phy_id;
1857
1858                 do {
1859                         phy_id = -1;
1860                         res = sas_find_bcast_phy(dev, &phy_id, i);
1861                         if (phy_id == -1)
1862                                 break;
1863                         res = sas_rediscover(dev, phy_id);
1864                         i = phy_id + 1;
1865                 } while (i < ex->num_phys);
1866         }
1867 out:
1868         return res;
1869 }
1870
1871 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1872                     struct request *req)
1873 {
1874         struct domain_device *dev;
1875         int ret, type = rphy->identify.device_type;
1876         struct request *rsp = req->next_rq;
1877
1878         if (!rsp) {
1879                 printk("%s: space for a smp response is missing\n",
1880                        __FUNCTION__);
1881                 return -EINVAL;
1882         }
1883
1884         /* seems aic94xx doesn't support */
1885         if (!rphy) {
1886                 printk("%s: can we send a smp request to a host?\n",
1887                        __FUNCTION__);
1888                 return -EINVAL;
1889         }
1890
1891         if (type != SAS_EDGE_EXPANDER_DEVICE &&
1892             type != SAS_FANOUT_EXPANDER_DEVICE) {
1893                 printk("%s: can we send a smp request to a device?\n",
1894                        __FUNCTION__);
1895                 return -EINVAL;
1896         }
1897
1898         dev = sas_find_dev_by_rphy(rphy);
1899         if (!dev) {
1900                 printk("%s: fail to find a domain_device?\n", __FUNCTION__);
1901                 return -EINVAL;
1902         }
1903
1904         /* do we need to support multiple segments? */
1905         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
1906                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
1907                        __FUNCTION__, req->bio->bi_vcnt, req->data_len,
1908                        rsp->bio->bi_vcnt, rsp->data_len);
1909                 return -EINVAL;
1910         }
1911
1912         ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
1913                                bio_data(rsp->bio), rsp->data_len);
1914
1915         return ret;
1916 }