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
  27 #include "sas_internal.h"
  28
  29 #include <scsi/scsi_transport.h>
  30 #include <scsi/scsi_transport_sas.h>
  31 #include "../scsi_sas_internal.h"
  32
  33 static int sas_discover_expander(struct domain_device *dev);
  34 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  35 static int sas_configure_phy(struct domain_device *dev, int phy_id,
  36                              u8 *sas_addr, int include);
  37 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  38
  39 #if 0
  40 /* FIXME: smp needs to migrate into the sas class */
  41 static ssize_t smp_portal_read(struct kobject *, struct bin_attribute *,
  42                                char *, loff_t, size_t);
  43 static ssize_t smp_portal_write(struct kobject *, struct bin_attribute *,
  44                                 char *, loff_t, size_t);
  45 #endif
  46
  47 /* ---------- SMP task management ---------- */
  48
  49 static void smp_task_timedout(unsigned long _task)
  50 {
  51         struct sas_task *task = (void *) _task;
  52         unsigned long flags;
  53
  54         spin_lock_irqsave(&task->task_state_lock, flags);
  55         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  56                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  57         spin_unlock_irqrestore(&task->task_state_lock, flags);
  58
  59         complete(&task->completion);
  60 }
  61
  62 static void smp_task_done(struct sas_task *task)
  63 {
  64         if (!del_timer(&task->timer))
  65                 return;
  66         complete(&task->completion);
  67 }
  68
  69 /* Give it some long enough timeout. In seconds. */
  70 #define SMP_TIMEOUT 10
  71
  72 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
  73                             void *resp, int resp_size)
  74 {
  75         int res, retry;
  76         struct sas_task *task = NULL;
  77         struct sas_internal *i =
  78                 to_sas_internal(dev->port->ha->core.shost->transportt);
  79
  80         for (retry = 0; retry < 3; retry++) {
  81                 task = sas_alloc_task(GFP_KERNEL);
  82                 if (!task)
  83                         return -ENOMEM;
  84
  85                 task->dev = dev;
  86                 task->task_proto = dev->tproto;
  87                 sg_init_one(&task->smp_task.smp_req, req, req_size);
  88                 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  89
  90                 task->task_done = smp_task_done;
  91
  92                 task->timer.data = (unsigned long) task;
  93                 task->timer.function = smp_task_timedout;
  94                 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  95                 add_timer(&task->timer);
  96
  97                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  98
  99                 if (res) {
 100                         del_timer(&task->timer);
 101                         SAS_DPRINTK("executing SMP task failed:%d\n", res);
 102                         goto ex_err;
 103                 }
 104
 105                 wait_for_completion(&task->completion);
 106                 res = -ETASK;
 107                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 108                         SAS_DPRINTK("smp task timed out or aborted\n");
 109                         i->dft->lldd_abort_task(task);
 110                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 111                                 SAS_DPRINTK("SMP task aborted and not done\n");
 112                                 goto ex_err;
 113                         }
 114                 }
 115                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 116                     task->task_status.stat == SAM_GOOD) {
 117                         res = 0;
 118                         break;
 119                 } else {
 120                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 121                                     "status 0x%x\n", __FUNCTION__,
 122                                     SAS_ADDR(dev->sas_addr),
 123                                     task->task_status.resp,
 124                                     task->task_status.stat);
 125                         sas_free_task(task);
 126                         task = NULL;
 127                 }
 128         }
 129 ex_err:
 130         BUG_ON(retry == 3 && task != NULL);
 131         if (task != NULL) {
 132                 sas_free_task(task);
 133         }
 134         return res;
 135 }
 136
 137 /* ---------- Allocations ---------- */
 138
 139 static inline void *alloc_smp_req(int size)
 140 {
 141         u8 *p = kzalloc(size, GFP_KERNEL);
 142         if (p)
 143                 p[0] = SMP_REQUEST;
 144         return p;
 145 }
 146
 147 static inline void *alloc_smp_resp(int size)
 148 {
 149         return kzalloc(size, GFP_KERNEL);
 150 }
 151
 152 /* ---------- Expander configuration ---------- */
 153
 154 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 155                            void *disc_resp)
 156 {
 157         struct expander_device *ex = &dev->ex_dev;
 158         struct ex_phy *phy = &ex->ex_phy[phy_id];
 159         struct smp_resp *resp = disc_resp;
 160         struct discover_resp *dr = &resp->disc;
 161         struct sas_rphy *rphy = dev->rphy;
 162         int rediscover = (phy->phy != NULL);
 163
 164         if (!rediscover) {
 165                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 166
 167                 /* FIXME: error_handling */
 168                 BUG_ON(!phy->phy);
 169         }
 170
 171         switch (resp->result) {
 172         case SMP_RESP_PHY_VACANT:
 173                 phy->phy_state = PHY_VACANT;
 174                 return;
 175         default:
 176                 phy->phy_state = PHY_NOT_PRESENT;
 177                 return;
 178         case SMP_RESP_FUNC_ACC:
 179                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 180                 break;
 181         }
 182
 183         phy->phy_id = phy_id;
 184         phy->attached_dev_type = dr->attached_dev_type;
 185         phy->linkrate = dr->linkrate;
 186         phy->attached_sata_host = dr->attached_sata_host;
 187         phy->attached_sata_dev  = dr->attached_sata_dev;
 188         phy->attached_sata_ps   = dr->attached_sata_ps;
 189         phy->attached_iproto = dr->iproto << 1;
 190         phy->attached_tproto = dr->tproto << 1;
 191         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 192         phy->attached_phy_id = dr->attached_phy_id;
 193         phy->phy_change_count = dr->change_count;
 194         phy->routing_attr = dr->routing_attr;
 195         phy->virtual = dr->virtual;
 196         phy->last_da_index = -1;
 197
 198         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 199         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 200         phy->phy->identify.phy_identifier = phy_id;
 201         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 202         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 203         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 204         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 205         phy->phy->negotiated_linkrate = phy->linkrate;
 206
 207         if (!rediscover)
 208                 sas_phy_add(phy->phy);
 209
 210         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 211                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 212                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 213                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 214                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 215                     SAS_ADDR(phy->attached_sas_addr));
 216
 217         return;
 218 }
 219
 220 #define DISCOVER_REQ_SIZE  16
 221 #define DISCOVER_RESP_SIZE 56
 222
 223 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 224 {
 225         struct expander_device *ex = &dev->ex_dev;
 226         int  res = 0;
 227         u8   *disc_req;
 228         u8   *disc_resp;
 229
 230         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 231         if (!disc_req)
 232                 return -ENOMEM;
 233
 234         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 235         if (!disc_resp) {
 236                 kfree(disc_req);
 237                 return -ENOMEM;
 238         }
 239
 240         disc_req[1] = SMP_DISCOVER;
 241
 242         if (0 <= single && single < ex->num_phys) {
 243                 disc_req[9] = single;
 244                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 245                                        disc_resp, DISCOVER_RESP_SIZE);
 246                 if (res)
 247                         goto out_err;
 248                 sas_set_ex_phy(dev, single, disc_resp);
 249         } else {
 250                 int i;
 251
 252                 for (i = 0; i < ex->num_phys; i++) {
 253                         disc_req[9] = i;
 254                         res = smp_execute_task(dev, disc_req,
 255                                                DISCOVER_REQ_SIZE, disc_resp,
 256                                                DISCOVER_RESP_SIZE);
 257                         if (res)
 258                                 goto out_err;
 259                         sas_set_ex_phy(dev, i, disc_resp);
 260                 }
 261         }
 262 out_err:
 263         kfree(disc_resp);
 264         kfree(disc_req);
 265         return res;
 266 }
 267
 268 static int sas_expander_discover(struct domain_device *dev)
 269 {
 270         struct expander_device *ex = &dev->ex_dev;
 271         int res = -ENOMEM;
 272
 273         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 274         if (!ex->ex_phy)
 275                 return -ENOMEM;
 276
 277         res = sas_ex_phy_discover(dev, -1);
 278         if (res)
 279                 goto out_err;
 280
 281         return 0;
 282  out_err:
 283         kfree(ex->ex_phy);
 284         ex->ex_phy = NULL;
 285         return res;
 286 }
 287
 288 #define MAX_EXPANDER_PHYS 128
 289
 290 static void ex_assign_report_general(struct domain_device *dev,
 291                                             struct smp_resp *resp)
 292 {
 293         struct report_general_resp *rg = &resp->rg;
 294
 295         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 296         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 297         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 298         dev->ex_dev.conf_route_table = rg->conf_route_table;
 299         dev->ex_dev.configuring = rg->configuring;
 300         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 301 }
 302
 303 #define RG_REQ_SIZE   8
 304 #define RG_RESP_SIZE 32
 305
 306 static int sas_ex_general(struct domain_device *dev)
 307 {
 308         u8 *rg_req;
 309         struct smp_resp *rg_resp;
 310         int res;
 311         int i;
 312
 313         rg_req = alloc_smp_req(RG_REQ_SIZE);
 314         if (!rg_req)
 315                 return -ENOMEM;
 316
 317         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 318         if (!rg_resp) {
 319                 kfree(rg_req);
 320                 return -ENOMEM;
 321         }
 322
 323         rg_req[1] = SMP_REPORT_GENERAL;
 324
 325         for (i = 0; i < 5; i++) {
 326                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 327                                        RG_RESP_SIZE);
 328
 329                 if (res) {
 330                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 331                                     SAS_ADDR(dev->sas_addr), res);
 332                         goto out;
 333                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 334                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 335                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 336                         res = rg_resp->result;
 337                         goto out;
 338                 }
 339
 340                 ex_assign_report_general(dev, rg_resp);
 341
 342                 if (dev->ex_dev.configuring) {
 343                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 344                                     SAS_ADDR(dev->sas_addr));
 345                         schedule_timeout_interruptible(5*HZ);
 346                 } else
 347                         break;
 348         }
 349 out:
 350         kfree(rg_req);
 351         kfree(rg_resp);
 352         return res;
 353 }
 354
 355 static void ex_assign_manuf_info(struct domain_device *dev, void
 356                                         *_mi_resp)
 357 {
 358         u8 *mi_resp = _mi_resp;
 359         struct sas_rphy *rphy = dev->rphy;
 360         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 361
 362         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 363         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 364         memcpy(edev->product_rev, mi_resp + 36,
 365                SAS_EXPANDER_PRODUCT_REV_LEN);
 366
 367         if (mi_resp[8] & 1) {
 368                 memcpy(edev->component_vendor_id, mi_resp + 40,
 369                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 370                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 371                 edev->component_revision_id = mi_resp[50];
 372         }
 373 }
 374
 375 #define MI_REQ_SIZE   8
 376 #define MI_RESP_SIZE 64
 377
 378 static int sas_ex_manuf_info(struct domain_device *dev)
 379 {
 380         u8 *mi_req;
 381         u8 *mi_resp;
 382         int res;
 383
 384         mi_req = alloc_smp_req(MI_REQ_SIZE);
 385         if (!mi_req)
 386                 return -ENOMEM;
 387
 388         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 389         if (!mi_resp) {
 390                 kfree(mi_req);
 391                 return -ENOMEM;
 392         }
 393
 394         mi_req[1] = SMP_REPORT_MANUF_INFO;
 395
 396         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 397         if (res) {
 398                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 399                             SAS_ADDR(dev->sas_addr), res);
 400                 goto out;
 401         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 402                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 403                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 404                 goto out;
 405         }
 406
 407         ex_assign_manuf_info(dev, mi_resp);
 408 out:
 409         kfree(mi_req);
 410         kfree(mi_resp);
 411         return res;
 412 }
 413
 414 #define PC_REQ_SIZE  44
 415 #define PC_RESP_SIZE 8
 416
 417 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 418                         enum phy_func phy_func,
 419                         struct sas_phy_linkrates *rates)
 420 {
 421         u8 *pc_req;
 422         u8 *pc_resp;
 423         int res;
 424
 425         pc_req = alloc_smp_req(PC_REQ_SIZE);
 426         if (!pc_req)
 427                 return -ENOMEM;
 428
 429         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 430         if (!pc_resp) {
 431                 kfree(pc_req);
 432                 return -ENOMEM;
 433         }
 434
 435         pc_req[1] = SMP_PHY_CONTROL;
 436         pc_req[9] = phy_id;
 437         pc_req[10]= phy_func;
 438         if (rates) {
 439                 pc_req[32] = rates->minimum_linkrate << 4;
 440                 pc_req[33] = rates->maximum_linkrate << 4;
 441         }
 442
 443         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 444
 445         kfree(pc_resp);
 446         kfree(pc_req);
 447         return res;
 448 }
 449
 450 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 451 {
 452         struct expander_device *ex = &dev->ex_dev;
 453         struct ex_phy *phy = &ex->ex_phy[phy_id];
 454
 455         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 456         phy->linkrate = SAS_PHY_DISABLED;
 457 }
 458
 459 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 460 {
 461         struct expander_device *ex = &dev->ex_dev;
 462         int i;
 463
 464         for (i = 0; i < ex->num_phys; i++) {
 465                 struct ex_phy *phy = &ex->ex_phy[i];
 466
 467                 if (phy->phy_state == PHY_VACANT ||
 468                     phy->phy_state == PHY_NOT_PRESENT)
 469                         continue;
 470
 471                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 472                         sas_ex_disable_phy(dev, i);
 473         }
 474 }
 475
 476 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 477                                             u8 *sas_addr)
 478 {
 479         struct domain_device *dev;
 480
 481         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 482                 return 1;
 483         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 484                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 485                         return 1;
 486         }
 487         return 0;
 488 }
 489
 490 #define RPEL_REQ_SIZE   16
 491 #define RPEL_RESP_SIZE  32
 492 int sas_smp_get_phy_events(struct sas_phy *phy)
 493 {
 494         int res;
 495         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 496         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 497         u8 *req = alloc_smp_req(RPEL_REQ_SIZE);
 498         u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);
 499
 500         if (!resp)
 501                 return -ENOMEM;
 502
 503         req[1] = SMP_REPORT_PHY_ERR_LOG;
 504         req[9] = phy->number;
 505
 506         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 507                                     resp, RPEL_RESP_SIZE);
 508
 509         if (!res)
 510                 goto out;
 511
 512         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 513         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 514         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 515         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 516
 517  out:
 518         kfree(resp);
 519         return res;
 520
 521 }
 522
 523 #define RPS_REQ_SIZE  16
 524 #define RPS_RESP_SIZE 60
 525
 526 static int sas_get_report_phy_sata(struct domain_device *dev,
 527                                           int phy_id,
 528                                           struct smp_resp *rps_resp)
 529 {
 530         int res;
 531         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 532
 533         if (!rps_req)
 534                 return -ENOMEM;
 535
 536         rps_req[1] = SMP_REPORT_PHY_SATA;
 537         rps_req[9] = phy_id;
 538
 539         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 540                                     rps_resp, RPS_RESP_SIZE);
 541
 542         kfree(rps_req);
 543         return 0;
 544 }
 545
 546 static void sas_ex_get_linkrate(struct domain_device *parent,
 547                                        struct domain_device *child,
 548                                        struct ex_phy *parent_phy)
 549 {
 550         struct expander_device *parent_ex = &parent->ex_dev;
 551         struct sas_port *port;
 552         int i;
 553
 554         child->pathways = 0;
 555
 556         port = parent_phy->port;
 557
 558         for (i = 0; i < parent_ex->num_phys; i++) {
 559                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 560
 561                 if (phy->phy_state == PHY_VACANT ||
 562                     phy->phy_state == PHY_NOT_PRESENT)
 563                         continue;
 564
 565                 if (SAS_ADDR(phy->attached_sas_addr) ==
 566                     SAS_ADDR(child->sas_addr)) {
 567
 568                         child->min_linkrate = min(parent->min_linkrate,
 569                                                   phy->linkrate);
 570                         child->max_linkrate = max(parent->max_linkrate,
 571                                                   phy->linkrate);
 572                         child->pathways++;
 573                         sas_port_add_phy(port, phy->phy);
 574                 }
 575         }
 576         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 577         child->pathways = min(child->pathways, parent->pathways);
 578 }
 579
 580 static struct domain_device *sas_ex_discover_end_dev(
 581         struct domain_device *parent, int phy_id)
 582 {
 583         struct expander_device *parent_ex = &parent->ex_dev;
 584         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 585         struct domain_device *child = NULL;
 586         struct sas_rphy *rphy;
 587         int res;
 588
 589         if (phy->attached_sata_host || phy->attached_sata_ps)
 590                 return NULL;
 591
 592         child = kzalloc(sizeof(*child), GFP_KERNEL);
 593         if (!child)
 594                 return NULL;
 595
 596         child->parent = parent;
 597         child->port   = parent->port;
 598         child->iproto = phy->attached_iproto;
 599         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 600         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 601         if (!phy->port) {
 602                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 603                 if (unlikely(!phy->port))
 604                         goto out_err;
 605                 if (unlikely(sas_port_add(phy->port) != 0)) {
 606                         sas_port_free(phy->port);
 607                         goto out_err;
 608                 }
 609         }
 610         sas_ex_get_linkrate(parent, child, phy);
 611
 612         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 613                 child->dev_type = SATA_DEV;
 614                 if (phy->attached_tproto & SAS_PROTO_STP)
 615                         child->tproto = phy->attached_tproto;
 616                 if (phy->attached_sata_dev)
 617                         child->tproto |= SATA_DEV;
 618                 res = sas_get_report_phy_sata(parent, phy_id,
 619                                               &child->sata_dev.rps_resp);
 620                 if (res) {
 621                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 622                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 623                                     phy_id, res);
 624                         goto out_free;
 625                 }
 626                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 627                        sizeof(struct dev_to_host_fis));
 628                 sas_init_dev(child);
 629                 res = sas_discover_sata(child);
 630                 if (res) {
 631                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 632                                     "%016llx:0x%x returned 0x%x\n",
 633                                     SAS_ADDR(child->sas_addr),
 634                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 635                         goto out_free;
 636                 }
 637         } else if (phy->attached_tproto & SAS_PROTO_SSP) {
 638                 child->dev_type = SAS_END_DEV;
 639                 rphy = sas_end_device_alloc(phy->port);
 640                 /* FIXME: error handling */
 641                 if (unlikely(!rphy))
 642                         goto out_free;
 643                 child->tproto = phy->attached_tproto;
 644                 sas_init_dev(child);
 645
 646                 child->rphy = rphy;
 647                 sas_fill_in_rphy(child, rphy);
 648
 649                 spin_lock(&parent->port->dev_list_lock);
 650                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 651                 spin_unlock(&parent->port->dev_list_lock);
 652
 653                 res = sas_discover_end_dev(child);
 654                 if (res) {
 655                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 656                                     "at %016llx:0x%x returned 0x%x\n",
 657                                     SAS_ADDR(child->sas_addr),
 658                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 659                         goto out_list_del;
 660                 }
 661         } else {
 662                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 663                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 664                             phy_id);
 665         }
 666
 667         list_add_tail(&child->siblings, &parent_ex->children);
 668         return child;
 669
 670  out_list_del:
 671         sas_rphy_free(child->rphy);
 672         child->rphy = NULL;
 673         list_del(&child->dev_list_node);
 674  out_free:
 675         sas_port_delete(phy->port);
 676  out_err:
 677         phy->port = NULL;
 678         kfree(child);
 679         return NULL;
 680 }
 681
 682 /* See if this phy is part of a wide port */
 683 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 684 {
 685         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 686         int i;
 687
 688         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 689                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 690
 691                 if (ephy == phy)
 692                         continue;
 693
 694                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 695                             SAS_ADDR_SIZE) && ephy->port) {
 696                         sas_port_add_phy(ephy->port, phy->phy);
 697                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 698                         return 0;
 699                 }
 700         }
 701
 702         return -ENODEV;
 703 }
 704
 705 static struct domain_device *sas_ex_discover_expander(
 706         struct domain_device *parent, int phy_id)
 707 {
 708         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 709         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 710         struct domain_device *child = NULL;
 711         struct sas_rphy *rphy;
 712         struct sas_expander_device *edev;
 713         struct asd_sas_port *port;
 714         int res;
 715
 716         if (phy->routing_attr == DIRECT_ROUTING) {
 717                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 718                             "allowed\n",
 719                             SAS_ADDR(parent->sas_addr), phy_id,
 720                             SAS_ADDR(phy->attached_sas_addr),
 721                             phy->attached_phy_id);
 722                 return NULL;
 723         }
 724         child = kzalloc(sizeof(*child), GFP_KERNEL);
 725         if (!child)
 726                 return NULL;
 727
 728         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 729         /* FIXME: better error handling */
 730         BUG_ON(sas_port_add(phy->port) != 0);
 731
 732
 733         switch (phy->attached_dev_type) {
 734         case EDGE_DEV:
 735                 rphy = sas_expander_alloc(phy->port,
 736                                           SAS_EDGE_EXPANDER_DEVICE);
 737                 break;
 738         case FANOUT_DEV:
 739                 rphy = sas_expander_alloc(phy->port,
 740                                           SAS_FANOUT_EXPANDER_DEVICE);
 741                 break;
 742         default:
 743                 rphy = NULL;    /* shut gcc up */
 744                 BUG();
 745         }
 746         port = parent->port;
 747         child->rphy = rphy;
 748         edev = rphy_to_expander_device(rphy);
 749         child->dev_type = phy->attached_dev_type;
 750         child->parent = parent;
 751         child->port = port;
 752         child->iproto = phy->attached_iproto;
 753         child->tproto = phy->attached_tproto;
 754         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 755         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 756         sas_ex_get_linkrate(parent, child, phy);
 757         edev->level = parent_ex->level + 1;
 758         parent->port->disc.max_level = max(parent->port->disc.max_level,
 759                                            edev->level);
 760         sas_init_dev(child);
 761         sas_fill_in_rphy(child, rphy);
 762         sas_rphy_add(rphy);
 763
 764         spin_lock(&parent->port->dev_list_lock);
 765         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 766         spin_unlock(&parent->port->dev_list_lock);
 767
 768         res = sas_discover_expander(child);
 769         if (res) {
 770                 kfree(child);
 771                 return NULL;
 772         }
 773         list_add_tail(&child->siblings, &parent->ex_dev.children);
 774         return child;
 775 }
 776
 777 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 778 {
 779         struct expander_device *ex = &dev->ex_dev;
 780         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 781         struct domain_device *child = NULL;
 782         int res = 0;
 783
 784         /* Phy state */
 785         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 786                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 787                         res = sas_ex_phy_discover(dev, phy_id);
 788                 if (res)
 789                         return res;
 790         }
 791
 792         /* Parent and domain coherency */
 793         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 794                              SAS_ADDR(dev->port->sas_addr))) {
 795                 sas_add_parent_port(dev, phy_id);
 796                 return 0;
 797         }
 798         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 799                             SAS_ADDR(dev->parent->sas_addr))) {
 800                 sas_add_parent_port(dev, phy_id);
 801                 if (ex_phy->routing_attr == TABLE_ROUTING)
 802                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 803                 return 0;
 804         }
 805
 806         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 807                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 808
 809         if (ex_phy->attached_dev_type == NO_DEVICE) {
 810                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 811                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 812                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 813                 }
 814                 return 0;
 815         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 816                 return 0;
 817
 818         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 819             ex_phy->attached_dev_type != FANOUT_DEV &&
 820             ex_phy->attached_dev_type != EDGE_DEV) {
 821                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 822                             "phy 0x%x\n", ex_phy->attached_dev_type,
 823                             SAS_ADDR(dev->sas_addr),
 824                             phy_id);
 825                 return 0;
 826         }
 827
 828         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 829         if (res) {
 830                 SAS_DPRINTK("configure routing for dev %016llx "
 831                             "reported 0x%x. Forgotten\n",
 832                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 833                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 834                 return res;
 835         }
 836
 837         res = sas_ex_join_wide_port(dev, phy_id);
 838         if (!res) {
 839                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 840                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 841                 return res;
 842         }
 843
 844         switch (ex_phy->attached_dev_type) {
 845         case SAS_END_DEV:
 846                 child = sas_ex_discover_end_dev(dev, phy_id);
 847                 break;
 848         case FANOUT_DEV:
 849                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 850                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 851                                     "attached to ex %016llx phy 0x%x\n",
 852                                     SAS_ADDR(ex_phy->attached_sas_addr),
 853                                     ex_phy->attached_phy_id,
 854                                     SAS_ADDR(dev->sas_addr),
 855                                     phy_id);
 856                         sas_ex_disable_phy(dev, phy_id);
 857                         break;
 858                 } else
 859                         memcpy(dev->port->disc.fanout_sas_addr,
 860                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 861                 /* fallthrough */
 862         case EDGE_DEV:
 863                 child = sas_ex_discover_expander(dev, phy_id);
 864                 break;
 865         default:
 866                 break;
 867         }
 868
 869         if (child) {
 870                 int i;
 871
 872                 for (i = 0; i < ex->num_phys; i++) {
 873                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 874                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 875                                 continue;
 876
 877                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 878                             SAS_ADDR(child->sas_addr))
 879                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 880                 }
 881         }
 882
 883         return res;
 884 }
 885
 886 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 887 {
 888         struct expander_device *ex = &dev->ex_dev;
 889         int i;
 890
 891         for (i = 0; i < ex->num_phys; i++) {
 892                 struct ex_phy *phy = &ex->ex_phy[i];
 893
 894                 if (phy->phy_state == PHY_VACANT ||
 895                     phy->phy_state == PHY_NOT_PRESENT)
 896                         continue;
 897
 898                 if ((phy->attached_dev_type == EDGE_DEV ||
 899                      phy->attached_dev_type == FANOUT_DEV) &&
 900                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 901
 902                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 903
 904                         return 1;
 905                 }
 906         }
 907         return 0;
 908 }
 909
 910 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 911 {
 912         struct expander_device *ex = &dev->ex_dev;
 913         struct domain_device *child;
 914         u8 sub_addr[8] = {0, };
 915
 916         list_for_each_entry(child, &ex->children, siblings) {
 917                 if (child->dev_type != EDGE_DEV &&
 918                     child->dev_type != FANOUT_DEV)
 919                         continue;
 920                 if (sub_addr[0] == 0) {
 921                         sas_find_sub_addr(child, sub_addr);
 922                         continue;
 923                 } else {
 924                         u8 s2[8];
 925
 926                         if (sas_find_sub_addr(child, s2) &&
 927                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 928
 929                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 930                                             "diverges from subtractive "
 931                                             "boundary %016llx\n",
 932                                             SAS_ADDR(dev->sas_addr),
 933                                             SAS_ADDR(child->sas_addr),
 934                                             SAS_ADDR(s2),
 935                                             SAS_ADDR(sub_addr));
 936
 937                                 sas_ex_disable_port(child, s2);
 938                         }
 939                 }
 940         }
 941         return 0;
 942 }
 943 /**
 944  * sas_ex_discover_devices -- discover devices attached to this expander
 945  * dev: pointer to the expander domain device
 946  * single: if you want to do a single phy, else set to -1;
 947  *
 948  * Configure this expander for use with its devices and register the
 949  * devices of this expander.
 950  */
 951 static int sas_ex_discover_devices(struct domain_device *dev, int single)
 952 {
 953         struct expander_device *ex = &dev->ex_dev;
 954         int i = 0, end = ex->num_phys;
 955         int res = 0;
 956
 957         if (0 <= single && single < end) {
 958                 i = single;
 959                 end = i+1;
 960         }
 961
 962         for ( ; i < end; i++) {
 963                 struct ex_phy *ex_phy = &ex->ex_phy[i];
 964
 965                 if (ex_phy->phy_state == PHY_VACANT ||
 966                     ex_phy->phy_state == PHY_NOT_PRESENT ||
 967                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
 968                         continue;
 969
 970                 switch (ex_phy->linkrate) {
 971                 case SAS_PHY_DISABLED:
 972                 case SAS_PHY_RESET_PROBLEM:
 973                 case SAS_SATA_PORT_SELECTOR:
 974                         continue;
 975                 default:
 976                         res = sas_ex_discover_dev(dev, i);
 977                         if (res)
 978                                 break;
 979                         continue;
 980                 }
 981         }
 982
 983         if (!res)
 984                 sas_check_level_subtractive_boundary(dev);
 985
 986         return res;
 987 }
 988
 989 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
 990 {
 991         struct expander_device *ex = &dev->ex_dev;
 992         int i;
 993         u8  *sub_sas_addr = NULL;
 994
 995         if (dev->dev_type != EDGE_DEV)
 996                 return 0;
 997
 998         for (i = 0; i < ex->num_phys; i++) {
 999                 struct ex_phy *phy = &ex->ex_phy[i];
1000
1001                 if (phy->phy_state == PHY_VACANT ||
1002                     phy->phy_state == PHY_NOT_PRESENT)
1003                         continue;
1004
1005                 if ((phy->attached_dev_type == FANOUT_DEV ||
1006                      phy->attached_dev_type == EDGE_DEV) &&
1007                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1008
1009                         if (!sub_sas_addr)
1010                                 sub_sas_addr = &phy->attached_sas_addr[0];
1011                         else if (SAS_ADDR(sub_sas_addr) !=
1012                                  SAS_ADDR(phy->attached_sas_addr)) {
1013
1014                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1015                                             "diverges(%016llx) on subtractive "
1016                                             "boundary(%016llx). Disabled\n",
1017                                             SAS_ADDR(dev->sas_addr), i,
1018                                             SAS_ADDR(phy->attached_sas_addr),
1019                                             SAS_ADDR(sub_sas_addr));
1020                                 sas_ex_disable_phy(dev, i);
1021                         }
1022                 }
1023         }
1024         return 0;
1025 }
1026
1027 static void sas_print_parent_topology_bug(struct domain_device *child,
1028                                                  struct ex_phy *parent_phy,
1029                                                  struct ex_phy *child_phy)
1030 {
1031         static const char ra_char[] = {
1032                 [DIRECT_ROUTING] = 'D',
1033                 [SUBTRACTIVE_ROUTING] = 'S',
1034                 [TABLE_ROUTING] = 'T',
1035         };
1036         static const char *ex_type[] = {
1037                 [EDGE_DEV] = "edge",
1038                 [FANOUT_DEV] = "fanout",
1039         };
1040         struct domain_device *parent = child->parent;
1041
1042         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1043                    "has %c:%c routing link!\n",
1044
1045                    ex_type[parent->dev_type],
1046                    SAS_ADDR(parent->sas_addr),
1047                    parent_phy->phy_id,
1048
1049                    ex_type[child->dev_type],
1050                    SAS_ADDR(child->sas_addr),
1051                    child_phy->phy_id,
1052
1053                    ra_char[parent_phy->routing_attr],
1054                    ra_char[child_phy->routing_attr]);
1055 }
1056
1057 static int sas_check_eeds(struct domain_device *child,
1058                                  struct ex_phy *parent_phy,
1059                                  struct ex_phy *child_phy)
1060 {
1061         int res = 0;
1062         struct domain_device *parent = child->parent;
1063
1064         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1065                 res = -ENODEV;
1066                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1067                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1068                             SAS_ADDR(parent->sas_addr),
1069                             parent_phy->phy_id,
1070                             SAS_ADDR(child->sas_addr),
1071                             child_phy->phy_id,
1072                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1073         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1074                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1075                        SAS_ADDR_SIZE);
1076                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1077                        SAS_ADDR_SIZE);
1078         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1079                     SAS_ADDR(parent->sas_addr)) ||
1080                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1081                     SAS_ADDR(child->sas_addr)))
1082                    &&
1083                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1084                      SAS_ADDR(parent->sas_addr)) ||
1085                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1086                      SAS_ADDR(child->sas_addr))))
1087                 ;
1088         else {
1089                 res = -ENODEV;
1090                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1091                             "phy 0x%x link forms a third EEDS!\n",
1092                             SAS_ADDR(parent->sas_addr),
1093                             parent_phy->phy_id,
1094                             SAS_ADDR(child->sas_addr),
1095                             child_phy->phy_id);
1096         }
1097
1098         return res;
1099 }
1100
1101 /* Here we spill over 80 columns.  It is intentional.
1102  */
1103 static int sas_check_parent_topology(struct domain_device *child)
1104 {
1105         struct expander_device *child_ex = &child->ex_dev;
1106         struct expander_device *parent_ex;
1107         int i;
1108         int res = 0;
1109
1110         if (!child->parent)
1111                 return 0;
1112
1113         if (child->parent->dev_type != EDGE_DEV &&
1114             child->parent->dev_type != FANOUT_DEV)
1115                 return 0;
1116
1117         parent_ex = &child->parent->ex_dev;
1118
1119         for (i = 0; i < parent_ex->num_phys; i++) {
1120                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1121                 struct ex_phy *child_phy;
1122
1123                 if (parent_phy->phy_state == PHY_VACANT ||
1124                     parent_phy->phy_state == PHY_NOT_PRESENT)
1125                         continue;
1126
1127                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1128                         continue;
1129
1130                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1131
1132                 switch (child->parent->dev_type) {
1133                 case EDGE_DEV:
1134                         if (child->dev_type == FANOUT_DEV) {
1135                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1136                                     child_phy->routing_attr != TABLE_ROUTING) {
1137                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1138                                         res = -ENODEV;
1139                                 }
1140                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1141                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1142                                         res = sas_check_eeds(child, parent_phy, child_phy);
1143                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1144                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1145                                         res = -ENODEV;
1146                                 }
1147                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1148                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1149                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1150                                 res = -ENODEV;
1151                         }
1152                         break;
1153                 case FANOUT_DEV:
1154                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1155                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1156                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1157                                 res = -ENODEV;
1158                         }
1159                         break;
1160                 default:
1161                         break;
1162                 }
1163         }
1164
1165         return res;
1166 }
1167
1168 #define RRI_REQ_SIZE  16
1169 #define RRI_RESP_SIZE 44
1170
1171 static int sas_configure_present(struct domain_device *dev, int phy_id,
1172                                  u8 *sas_addr, int *index, int *present)
1173 {
1174         int i, res = 0;
1175         struct expander_device *ex = &dev->ex_dev;
1176         struct ex_phy *phy = &ex->ex_phy[phy_id];
1177         u8 *rri_req;
1178         u8 *rri_resp;
1179
1180         *present = 0;
1181         *index = 0;
1182
1183         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1184         if (!rri_req)
1185                 return -ENOMEM;
1186
1187         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1188         if (!rri_resp) {
1189                 kfree(rri_req);
1190                 return -ENOMEM;
1191         }
1192
1193         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1194         rri_req[9] = phy_id;
1195
1196         for (i = 0; i < ex->max_route_indexes ; i++) {
1197                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1198                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1199                                        RRI_RESP_SIZE);
1200                 if (res)
1201                         goto out;
1202                 res = rri_resp[2];
1203                 if (res == SMP_RESP_NO_INDEX) {
1204                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1205                                     "phy 0x%x index 0x%x\n",
1206                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1207                         goto out;
1208                 } else if (res != SMP_RESP_FUNC_ACC) {
1209                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1210                                     "result 0x%x\n", __FUNCTION__,
1211                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1212                         goto out;
1213                 }
1214                 if (SAS_ADDR(sas_addr) != 0) {
1215                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1216                                 *index = i;
1217                                 if ((rri_resp[12] & 0x80) == 0x80)
1218                                         *present = 0;
1219                                 else
1220                                         *present = 1;
1221                                 goto out;
1222                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1223                                 *index = i;
1224                                 *present = 0;
1225                                 goto out;
1226                         }
1227                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1228                            phy->last_da_index < i) {
1229                         phy->last_da_index = i;
1230                         *index = i;
1231                         *present = 0;
1232                         goto out;
1233                 }
1234         }
1235         res = -1;
1236 out:
1237         kfree(rri_req);
1238         kfree(rri_resp);
1239         return res;
1240 }
1241
1242 #define CRI_REQ_SIZE  44
1243 #define CRI_RESP_SIZE  8
1244
1245 static int sas_configure_set(struct domain_device *dev, int phy_id,
1246                              u8 *sas_addr, int index, int include)
1247 {
1248         int res;
1249         u8 *cri_req;
1250         u8 *cri_resp;
1251
1252         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1253         if (!cri_req)
1254                 return -ENOMEM;
1255
1256         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1257         if (!cri_resp) {
1258                 kfree(cri_req);
1259                 return -ENOMEM;
1260         }
1261
1262         cri_req[1] = SMP_CONF_ROUTE_INFO;
1263         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1264         cri_req[9] = phy_id;
1265         if (SAS_ADDR(sas_addr) == 0 || !include)
1266                 cri_req[12] |= 0x80;
1267         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1268
1269         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1270                                CRI_RESP_SIZE);
1271         if (res)
1272                 goto out;
1273         res = cri_resp[2];
1274         if (res == SMP_RESP_NO_INDEX) {
1275                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1276                             "index 0x%x\n",
1277                             SAS_ADDR(dev->sas_addr), phy_id, index);
1278         }
1279 out:
1280         kfree(cri_req);
1281         kfree(cri_resp);
1282         return res;
1283 }
1284
1285 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1286                                     u8 *sas_addr, int include)
1287 {
1288         int index;
1289         int present;
1290         int res;
1291
1292         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1293         if (res)
1294                 return res;
1295         if (include ^ present)
1296                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1297
1298         return res;
1299 }
1300
1301 /**
1302  * sas_configure_parent -- configure routing table of parent
1303  * parent: parent expander
1304  * child: child expander
1305  * sas_addr: SAS port identifier of device directly attached to child
1306  */
1307 static int sas_configure_parent(struct domain_device *parent,
1308                                 struct domain_device *child,
1309                                 u8 *sas_addr, int include)
1310 {
1311         struct expander_device *ex_parent = &parent->ex_dev;
1312         int res = 0;
1313         int i;
1314
1315         if (parent->parent) {
1316                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1317                                            include);
1318                 if (res)
1319                         return res;
1320         }
1321
1322         if (ex_parent->conf_route_table == 0) {
1323                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1324                             SAS_ADDR(parent->sas_addr));
1325                 return 0;
1326         }
1327
1328         for (i = 0; i < ex_parent->num_phys; i++) {
1329                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1330
1331                 if ((phy->routing_attr == TABLE_ROUTING) &&
1332                     (SAS_ADDR(phy->attached_sas_addr) ==
1333                      SAS_ADDR(child->sas_addr))) {
1334                         res = sas_configure_phy(parent, i, sas_addr, include);
1335                         if (res)
1336                                 return res;
1337                 }
1338         }
1339
1340         return res;
1341 }
1342
1343 /**
1344  * sas_configure_routing -- configure routing
1345  * dev: expander device
1346  * sas_addr: port identifier of device directly attached to the expander device
1347  */
1348 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1349 {
1350         if (dev->parent)
1351                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1352         return 0;
1353 }
1354
1355 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1356 {
1357         if (dev->parent)
1358                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1359         return 0;
1360 }
1361
1362 #if 0
1363 #define SMP_BIN_ATTR_NAME "smp_portal"
1364
1365 static void sas_ex_smp_hook(struct domain_device *dev)
1366 {
1367         struct expander_device *ex_dev = &dev->ex_dev;
1368         struct bin_attribute *bin_attr = &ex_dev->smp_bin_attr;
1369
1370         memset(bin_attr, 0, sizeof(*bin_attr));
1371
1372         bin_attr->attr.name = SMP_BIN_ATTR_NAME;
1373         bin_attr->attr.mode = 0600;
1374
1375         bin_attr->size = 0;
1376         bin_attr->private = NULL;
1377         bin_attr->read = smp_portal_read;
1378         bin_attr->write= smp_portal_write;
1379         bin_attr->mmap = NULL;
1380
1381         ex_dev->smp_portal_pid = -1;
1382         init_MUTEX(&ex_dev->smp_sema);
1383 }
1384 #endif
1385
1386 /**
1387  * sas_discover_expander -- expander discovery
1388  * @ex: pointer to expander domain device
1389  *
1390  * See comment in sas_discover_sata().
1391  */
1392 static int sas_discover_expander(struct domain_device *dev)
1393 {
1394         int res;
1395
1396         res = sas_notify_lldd_dev_found(dev);
1397         if (res)
1398                 return res;
1399
1400         res = sas_ex_general(dev);
1401         if (res)
1402                 goto out_err;
1403         res = sas_ex_manuf_info(dev);
1404         if (res)
1405                 goto out_err;
1406
1407         res = sas_expander_discover(dev);
1408         if (res) {
1409                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1410                             SAS_ADDR(dev->sas_addr), res);
1411                 goto out_err;
1412         }
1413
1414         sas_check_ex_subtractive_boundary(dev);
1415         res = sas_check_parent_topology(dev);
1416         if (res)
1417                 goto out_err;
1418         return 0;
1419 out_err:
1420         sas_notify_lldd_dev_gone(dev);
1421         return res;
1422 }
1423
1424 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1425 {
1426         int res = 0;
1427         struct domain_device *dev;
1428
1429         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1430                 if (dev->dev_type == EDGE_DEV ||
1431                     dev->dev_type == FANOUT_DEV) {
1432                         struct sas_expander_device *ex =
1433                                 rphy_to_expander_device(dev->rphy);
1434
1435                         if (level == ex->level)
1436                                 res = sas_ex_discover_devices(dev, -1);
1437                         else if (level > 0)
1438                                 res = sas_ex_discover_devices(port->port_dev, -1);
1439
1440                 }
1441         }
1442
1443         return res;
1444 }
1445
1446 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1447 {
1448         int res;
1449         int level;
1450
1451         do {
1452                 level = port->disc.max_level;
1453                 res = sas_ex_level_discovery(port, level);
1454                 mb();
1455         } while (level < port->disc.max_level);
1456
1457         return res;
1458 }
1459
1460 int sas_discover_root_expander(struct domain_device *dev)
1461 {
1462         int res;
1463         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1464
1465         res = sas_rphy_add(dev->rphy);
1466         if (res)
1467                 goto out_err;
1468
1469         ex->level = dev->port->disc.max_level; /* 0 */
1470         res = sas_discover_expander(dev);
1471         if (res)
1472                 goto out_err2;
1473
1474         sas_ex_bfs_disc(dev->port);
1475
1476         return res;
1477
1478 out_err2:
1479         sas_rphy_remove(dev->rphy);
1480 out_err:
1481         return res;
1482 }
1483
1484 /* ---------- Domain revalidation ---------- */
1485
1486 static int sas_get_phy_discover(struct domain_device *dev,
1487                                 int phy_id, struct smp_resp *disc_resp)
1488 {
1489         int res;
1490         u8 *disc_req;
1491
1492         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1493         if (!disc_req)
1494                 return -ENOMEM;
1495
1496         disc_req[1] = SMP_DISCOVER;
1497         disc_req[9] = phy_id;
1498
1499         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1500                                disc_resp, DISCOVER_RESP_SIZE);
1501         if (res)
1502                 goto out;
1503         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1504                 res = disc_resp->result;
1505                 goto out;
1506         }
1507 out:
1508         kfree(disc_req);
1509         return res;
1510 }
1511
1512 static int sas_get_phy_change_count(struct domain_device *dev,
1513                                     int phy_id, int *pcc)
1514 {
1515         int res;
1516         struct smp_resp *disc_resp;
1517
1518         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1519         if (!disc_resp)
1520                 return -ENOMEM;
1521
1522         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1523         if (!res)
1524                 *pcc = disc_resp->disc.change_count;
1525
1526         kfree(disc_resp);
1527         return res;
1528 }
1529
1530 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1531                                          int phy_id, u8 *attached_sas_addr)
1532 {
1533         int res;
1534         struct smp_resp *disc_resp;
1535         struct discover_resp *dr;
1536
1537         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1538         if (!disc_resp)
1539                 return -ENOMEM;
1540         dr = &disc_resp->disc;
1541
1542         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1543         if (!res) {
1544                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1545                 if (dr->attached_dev_type == 0)
1546                         memset(attached_sas_addr, 0, 8);
1547         }
1548         kfree(disc_resp);
1549         return res;
1550 }
1551
1552 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1553                               int from_phy)
1554 {
1555         struct expander_device *ex = &dev->ex_dev;
1556         int res = 0;
1557         int i;
1558
1559         for (i = from_phy; i < ex->num_phys; i++) {
1560                 int phy_change_count = 0;
1561
1562                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1563                 if (res)
1564                         goto out;
1565                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1566                         ex->ex_phy[i].phy_change_count = phy_change_count;
1567                         *phy_id = i;
1568                         return 0;
1569                 }
1570         }
1571 out:
1572         return res;
1573 }
1574
1575 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1576 {
1577         int res;
1578         u8  *rg_req;
1579         struct smp_resp  *rg_resp;
1580
1581         rg_req = alloc_smp_req(RG_REQ_SIZE);
1582         if (!rg_req)
1583                 return -ENOMEM;
1584
1585         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1586         if (!rg_resp) {
1587                 kfree(rg_req);
1588                 return -ENOMEM;
1589         }
1590
1591         rg_req[1] = SMP_REPORT_GENERAL;
1592
1593         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1594                                RG_RESP_SIZE);
1595         if (res)
1596                 goto out;
1597         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1598                 res = rg_resp->result;
1599                 goto out;
1600         }
1601
1602         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1603 out:
1604         kfree(rg_resp);
1605         kfree(rg_req);
1606         return res;
1607 }
1608
1609 static int sas_find_bcast_dev(struct domain_device *dev,
1610                               struct domain_device **src_dev)
1611 {
1612         struct expander_device *ex = &dev->ex_dev;
1613         int ex_change_count = -1;
1614         int res;
1615
1616         res = sas_get_ex_change_count(dev, &ex_change_count);
1617         if (res)
1618                 goto out;
1619         if (ex_change_count != -1 &&
1620             ex_change_count != ex->ex_change_count) {
1621                 *src_dev = dev;
1622                 ex->ex_change_count = ex_change_count;
1623         } else {
1624                 struct domain_device *ch;
1625
1626                 list_for_each_entry(ch, &ex->children, siblings) {
1627                         if (ch->dev_type == EDGE_DEV ||
1628                             ch->dev_type == FANOUT_DEV) {
1629                                 res = sas_find_bcast_dev(ch, src_dev);
1630                                 if (src_dev)
1631                                         return res;
1632                         }
1633                 }
1634         }
1635 out:
1636         return res;
1637 }
1638
1639 static void sas_unregister_ex_tree(struct domain_device *dev)
1640 {
1641         struct expander_device *ex = &dev->ex_dev;
1642         struct domain_device *child, *n;
1643
1644         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1645                 if (child->dev_type == EDGE_DEV ||
1646                     child->dev_type == FANOUT_DEV)
1647                         sas_unregister_ex_tree(child);
1648                 else
1649                         sas_unregister_dev(child);
1650         }
1651         sas_unregister_dev(dev);
1652 }
1653
1654 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1655                                          int phy_id)
1656 {
1657         struct expander_device *ex_dev = &parent->ex_dev;
1658         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1659         struct domain_device *child, *n;
1660
1661         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1662                 if (SAS_ADDR(child->sas_addr) ==
1663                     SAS_ADDR(phy->attached_sas_addr)) {
1664                         if (child->dev_type == EDGE_DEV ||
1665                             child->dev_type == FANOUT_DEV)
1666                                 sas_unregister_ex_tree(child);
1667                         else
1668                                 sas_unregister_dev(child);
1669                         break;
1670                 }
1671         }
1672         sas_disable_routing(parent, phy->attached_sas_addr);
1673         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1674         sas_port_delete_phy(phy->port, phy->phy);
1675         if (phy->port->num_phys == 0)
1676                 sas_port_delete(phy->port);
1677         phy->port = NULL;
1678 }
1679
1680 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1681                                           const int level)
1682 {
1683         struct expander_device *ex_root = &root->ex_dev;
1684         struct domain_device *child;
1685         int res = 0;
1686
1687         list_for_each_entry(child, &ex_root->children, siblings) {
1688                 if (child->dev_type == EDGE_DEV ||
1689                     child->dev_type == FANOUT_DEV) {
1690                         struct sas_expander_device *ex =
1691                                 rphy_to_expander_device(child->rphy);
1692
1693                         if (level > ex->level)
1694                                 res = sas_discover_bfs_by_root_level(child,
1695                                                                      level);
1696                         else if (level == ex->level)
1697                                 res = sas_ex_discover_devices(child, -1);
1698                 }
1699         }
1700         return res;
1701 }
1702
1703 static int sas_discover_bfs_by_root(struct domain_device *dev)
1704 {
1705         int res;
1706         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1707         int level = ex->level+1;
1708
1709         res = sas_ex_discover_devices(dev, -1);
1710         if (res)
1711                 goto out;
1712         do {
1713                 res = sas_discover_bfs_by_root_level(dev, level);
1714                 mb();
1715                 level += 1;
1716         } while (level <= dev->port->disc.max_level);
1717 out:
1718         return res;
1719 }
1720
1721 static int sas_discover_new(struct domain_device *dev, int phy_id)
1722 {
1723         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1724         struct domain_device *child;
1725         int res;
1726
1727         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1728                     SAS_ADDR(dev->sas_addr), phy_id);
1729         res = sas_ex_phy_discover(dev, phy_id);
1730         if (res)
1731                 goto out;
1732         res = sas_ex_discover_devices(dev, phy_id);
1733         if (res)
1734                 goto out;
1735         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1736                 if (SAS_ADDR(child->sas_addr) ==
1737                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1738                         if (child->dev_type == EDGE_DEV ||
1739                             child->dev_type == FANOUT_DEV)
1740                                 res = sas_discover_bfs_by_root(child);
1741                         break;
1742                 }
1743         }
1744 out:
1745         return res;
1746 }
1747
1748 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1749 {
1750         struct expander_device *ex = &dev->ex_dev;
1751         struct ex_phy *phy = &ex->ex_phy[phy_id];
1752         u8 attached_sas_addr[8];
1753         int res;
1754
1755         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1756         switch (res) {
1757         case SMP_RESP_NO_PHY:
1758                 phy->phy_state = PHY_NOT_PRESENT;
1759                 sas_unregister_devs_sas_addr(dev, phy_id);
1760                 goto out; break;
1761         case SMP_RESP_PHY_VACANT:
1762                 phy->phy_state = PHY_VACANT;
1763                 sas_unregister_devs_sas_addr(dev, phy_id);
1764                 goto out; break;
1765         case SMP_RESP_FUNC_ACC:
1766                 break;
1767         }
1768
1769         if (SAS_ADDR(attached_sas_addr) == 0) {
1770                 phy->phy_state = PHY_EMPTY;
1771                 sas_unregister_devs_sas_addr(dev, phy_id);
1772         } else if (SAS_ADDR(attached_sas_addr) ==
1773                    SAS_ADDR(phy->attached_sas_addr)) {
1774                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1775                             SAS_ADDR(dev->sas_addr), phy_id);
1776                 sas_ex_phy_discover(dev, phy_id);
1777         } else
1778                 res = sas_discover_new(dev, phy_id);
1779 out:
1780         return res;
1781 }
1782
1783 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1784 {
1785         struct expander_device *ex = &dev->ex_dev;
1786         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1787         int res = 0;
1788         int i;
1789
1790         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1791                     SAS_ADDR(dev->sas_addr), phy_id);
1792
1793         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1794                 for (i = 0; i < ex->num_phys; i++) {
1795                         struct ex_phy *phy = &ex->ex_phy[i];
1796
1797                         if (i == phy_id)
1798                                 continue;
1799                         if (SAS_ADDR(phy->attached_sas_addr) ==
1800                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1801                                 SAS_DPRINTK("phy%d part of wide port with "
1802                                             "phy%d\n", phy_id, i);
1803                                 goto out;
1804                         }
1805                 }
1806                 res = sas_rediscover_dev(dev, phy_id);
1807         } else
1808                 res = sas_discover_new(dev, phy_id);
1809 out:
1810         return res;
1811 }
1812
1813 /**
1814  * sas_revalidate_domain -- revalidate the domain
1815  * @port: port to the domain of interest
1816  *
1817  * NOTE: this process _must_ quit (return) as soon as any connection
1818  * errors are encountered.  Connection recovery is done elsewhere.
1819  * Discover process only interrogates devices in order to discover the
1820  * domain.
1821  */
1822 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1823 {
1824         int res;
1825         struct domain_device *dev = NULL;
1826
1827         res = sas_find_bcast_dev(port_dev, &dev);
1828         if (res)
1829                 goto out;
1830         if (dev) {
1831                 struct expander_device *ex = &dev->ex_dev;
1832                 int i = 0, phy_id;
1833
1834                 do {
1835                         phy_id = -1;
1836                         res = sas_find_bcast_phy(dev, &phy_id, i);
1837                         if (phy_id == -1)
1838                                 break;
1839                         res = sas_rediscover(dev, phy_id);
1840                         i = phy_id + 1;
1841                 } while (i < ex->num_phys);
1842         }
1843 out:
1844         return res;
1845 }
1846
1847 #if 0
1848 /* ---------- SMP portal ---------- */
1849
1850 static ssize_t smp_portal_write(struct kobject *kobj,
1851                                 struct bin_attribute *bin_attr,
1852                                 char *buf, loff_t offs, size_t size)
1853 {
1854         struct domain_device *dev = to_dom_device(kobj);
1855         struct expander_device *ex = &dev->ex_dev;
1856
1857         if (offs != 0)
1858                 return -EFBIG;
1859         else if (size == 0)
1860                 return 0;
1861
1862         down_interruptible(&ex->smp_sema);
1863         if (ex->smp_req)
1864                 kfree(ex->smp_req);
1865         ex->smp_req = kzalloc(size, GFP_USER);
1866         if (!ex->smp_req) {
1867                 up(&ex->smp_sema);
1868                 return -ENOMEM;
1869         }
1870         memcpy(ex->smp_req, buf, size);
1871         ex->smp_req_size = size;
1872         ex->smp_portal_pid = current->pid;
1873         up(&ex->smp_sema);
1874
1875         return size;
1876 }
1877
1878 static ssize_t smp_portal_read(struct kobject *kobj,
1879                                struct bin_attribute *bin_attr,
1880                                char *buf, loff_t offs, size_t size)
1881 {
1882         struct domain_device *dev = to_dom_device(kobj);
1883         struct expander_device *ex = &dev->ex_dev;
1884         u8 *smp_resp;
1885         int res = -EINVAL;
1886
1887         /* XXX: sysfs gives us an offset of 0x10 or 0x8 while in fact
1888          *  it should be 0.
1889          */
1890
1891         down_interruptible(&ex->smp_sema);
1892         if (!ex->smp_req || ex->smp_portal_pid != current->pid)
1893                 goto out;
1894
1895         res = 0;
1896         if (size == 0)
1897                 goto out;
1898
1899         res = -ENOMEM;
1900         smp_resp = alloc_smp_resp(size);
1901         if (!smp_resp)
1902                 goto out;
1903         res = smp_execute_task(dev, ex->smp_req, ex->smp_req_size,
1904                                smp_resp, size);
1905         if (!res) {
1906                 memcpy(buf, smp_resp, size);
1907                 res = size;
1908         }
1909
1910         kfree(smp_resp);
1911 out:
1912         kfree(ex->smp_req);
1913         ex->smp_req = NULL;
1914         ex->smp_req_size = 0;
1915         ex->smp_portal_pid = -1;
1916         up(&ex->smp_sema);
1917         return res;
1918 }
1919 #endif