drivers/scsi/sas/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  * $Id: //depot/sas-class/sas_expander.c#60 $
  24  */
  25
  26 #include <linux/pci.h>
  27 #include <linux/scatterlist.h>
  28
  29 #include "sas_internal.h"
  30 #include <scsi/sas/sas_task.h>
  31 #include <scsi/sas/sas_discover.h>
  32
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_sas.h>
  35 #include "../scsi_sas_internal.h"
  36
  37 static int sas_discover_expander(struct domain_device *dev);
  38 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  39 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  40
  41 #if 0
  42 /* FIXME: smp needs to migrate into the sas class */
  43 static ssize_t smp_portal_read(struct kobject *, char *, loff_t, size_t);
  44 static ssize_t smp_portal_write(struct kobject *, 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;
  76         struct sas_task *task = sas_alloc_task(GFP_KERNEL);
  77         struct sas_internal *i =
  78                 to_sas_internal(dev->port->ha->core.shost->transportt);
  79
  80         if (!task)
  81                 return -ENOMEM;
  82
  83         task->dev = dev;
  84         task->task_proto = dev->tproto;
  85         sg_init_one(&task->smp_task.smp_req, req, req_size);
  86         sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  87
  88         task->task_done = smp_task_done;
  89
  90         task->timer.data = (unsigned long) task;
  91         task->timer.function = smp_task_timedout;
  92         task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  93         add_timer(&task->timer);
  94
  95         res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  96
  97         if (res) {
  98                 del_timer(&task->timer);
  99                 SAS_DPRINTK("executing SMP task failed:%d\n", res);
 100                 goto ex_err;
 101         }
 102
 103         wait_for_completion(&task->completion);
 104         res = -ETASK;
 105         if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 106                 SAS_DPRINTK("smp task timed out or aborted\n");
 107                 i->dft->lldd_abort_task(task);
 108                 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 109                         SAS_DPRINTK("SMP task aborted and not done\n");
 110                         goto ex_err;
 111                 }
 112         }
 113         if (task->task_status.resp == SAS_TASK_COMPLETE &&
 114             task->task_status.stat == SAM_GOOD)
 115                 res = 0;
 116         else
 117                 SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 118                             "status 0x%x\n", __FUNCTION__,
 119                             SAS_ADDR(dev->sas_addr),
 120                             task->task_status.resp,
 121                             task->task_status.stat);
 122 ex_err:
 123         sas_free_task(task);
 124         return res;
 125 }
 126
 127 /* ---------- Allocations ---------- */
 128
 129 static inline void *alloc_smp_req(int size)
 130 {
 131         u8 *p = kzalloc(size, GFP_KERNEL);
 132         if (p)
 133                 p[0] = SMP_REQUEST;
 134         return p;
 135 }
 136
 137 static inline void *alloc_smp_resp(int size)
 138 {
 139         return kzalloc(size, GFP_KERNEL);
 140 }
 141
 142 /* ---------- Expander configuration ---------- */
 143
 144 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 145                            void *disc_resp)
 146 {
 147         struct expander_device *ex = &dev->ex_dev;
 148         struct ex_phy *phy = &ex->ex_phy[phy_id];
 149         struct smp_resp *resp = disc_resp;
 150         struct discover_resp *dr = &resp->disc;
 151         struct sas_rphy *rphy = dev->rphy;
 152
 153         phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 154         dev_printk(KERN_ERR, &phy->phy->dev, "ALLOCATED\n\n");
 155
 156         /* FIXME: error_handling */
 157         BUG_ON(!phy->phy);
 158
 159         switch (resp->result) {
 160         case SMP_RESP_PHY_VACANT:
 161                 phy->phy_state = PHY_VACANT;
 162                 return;
 163         default:
 164                 phy->phy_state = PHY_NOT_PRESENT;
 165                 return;
 166         case SMP_RESP_FUNC_ACC:
 167                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 168                 break;
 169         }
 170
 171         phy->phy_id = phy_id;
 172         phy->attached_dev_type = dr->attached_dev_type;
 173         phy->linkrate = dr->linkrate;
 174         phy->attached_sata_host = dr->attached_sata_host;
 175         phy->attached_sata_dev  = dr->attached_sata_dev;
 176         phy->attached_sata_ps   = dr->attached_sata_ps;
 177         phy->attached_iproto = dr->iproto << 1;
 178         phy->attached_tproto = dr->tproto << 1;
 179         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 180         phy->attached_phy_id = dr->attached_phy_id;
 181         phy->phy_change_count = dr->change_count;
 182         phy->routing_attr = dr->routing_attr;
 183         phy->virtual = dr->virtual;
 184         phy->last_da_index = -1;
 185
 186         /* FIXME: This probably isn't right, but it will do for now*/
 187         phy->phy->local_attached = 1;
 188
 189         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 190         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 191         phy->phy->identify.phy_identifier = phy_id;
 192         phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_1_5_GBPS;
 193         phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_3_0_GBPS;
 194         phy->phy->minimum_linkrate = SAS_LINK_RATE_1_5_GBPS;
 195         phy->phy->maximum_linkrate = SAS_LINK_RATE_3_0_GBPS;
 196         switch (phy->linkrate) {
 197         case PHY_LINKRATE_1_5:
 198                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_1_5_GBPS;
 199                 break;
 200         case PHY_LINKRATE_3:
 201                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_3_0_GBPS;
 202                 break;
 203         case PHY_LINKRATE_6:
 204                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_6_0_GBPS;
 205                 break;
 206         default:
 207                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
 208                 break;
 209         }
 210
 211         sas_phy_add(phy->phy);
 212
 213         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 214                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 215                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 216                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 217                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 218                     SAS_ADDR(phy->attached_sas_addr));
 219
 220         return;
 221 }
 222
 223 #define DISCOVER_REQ_SIZE  16
 224 #define DISCOVER_RESP_SIZE 56
 225
 226 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 227 {
 228         struct expander_device *ex = &dev->ex_dev;
 229         int  res = 0;
 230         u8   *disc_req;
 231         u8   *disc_resp;
 232
 233         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 234         if (!disc_req)
 235                 return -ENOMEM;
 236
 237         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 238         if (!disc_resp) {
 239                 kfree(disc_req);
 240                 return -ENOMEM;
 241         }
 242
 243         disc_req[1] = SMP_DISCOVER;
 244
 245         if (0 <= single && single < ex->num_phys) {
 246                 disc_req[9] = single;
 247                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 248                                        disc_resp, DISCOVER_RESP_SIZE);
 249                 if (res)
 250                         goto out_err;
 251                 sas_set_ex_phy(dev, single, disc_resp);
 252         } else {
 253                 int i;
 254
 255                 for (i = 0; i < ex->num_phys; i++) {
 256                         disc_req[9] = i;
 257                         res = smp_execute_task(dev, disc_req,
 258                                                DISCOVER_REQ_SIZE, disc_resp,
 259                                                DISCOVER_RESP_SIZE);
 260                         if (res)
 261                                 goto out_err;
 262                         sas_set_ex_phy(dev, i, disc_resp);
 263                 }
 264         }
 265 out_err:
 266         kfree(disc_resp);
 267         kfree(disc_req);
 268         return res;
 269 }
 270
 271 static int sas_expander_discover(struct domain_device *dev)
 272 {
 273         struct expander_device *ex = &dev->ex_dev;
 274         int res;
 275
 276         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 277         if (!ex->ex_phy)
 278                 return -ENOMEM;
 279
 280         res = sas_ex_phy_discover(dev, -1);
 281         if (res)
 282                 goto out_err;
 283
 284         return 0;
 285 out_err:
 286         kfree(ex->ex_phy);
 287         ex->ex_phy = NULL;
 288         return res;
 289 }
 290
 291 #define MAX_EXPANDER_PHYS 128
 292
 293 static inline void ex_assign_report_general(struct domain_device *dev,
 294                                             struct smp_resp *resp)
 295 {
 296         struct report_general_resp *rg = &resp->rg;
 297
 298         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 299         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 300         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 301         dev->ex_dev.conf_route_table = rg->conf_route_table;
 302         dev->ex_dev.configuring = rg->configuring;
 303         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 304 }
 305
 306 #define RG_REQ_SIZE   8
 307 #define RG_RESP_SIZE 32
 308
 309 static int sas_ex_general(struct domain_device *dev)
 310 {
 311         u8 *rg_req;
 312         struct smp_resp *rg_resp;
 313         int res;
 314         int i;
 315
 316         rg_req = alloc_smp_req(RG_REQ_SIZE);
 317         if (!rg_req)
 318                 return -ENOMEM;
 319
 320         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 321         if (!rg_resp) {
 322                 kfree(rg_req);
 323                 return -ENOMEM;
 324         }
 325
 326         rg_req[1] = SMP_REPORT_GENERAL;
 327
 328         for (i = 0; i < 5; i++) {
 329                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 330                                        RG_RESP_SIZE);
 331
 332                 if (res) {
 333                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 334                                     SAS_ADDR(dev->sas_addr), res);
 335                         goto out;
 336                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 337                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 338                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 339                         res = rg_resp->result;
 340                         goto out;
 341                 }
 342
 343                 ex_assign_report_general(dev, rg_resp);
 344
 345                 if (dev->ex_dev.configuring) {
 346                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 347                                     SAS_ADDR(dev->sas_addr));
 348                         schedule_timeout_interruptible(5*HZ);
 349                 } else
 350                         break;
 351         }
 352 out:
 353         kfree(rg_req);
 354         kfree(rg_resp);
 355         return res;
 356 }
 357
 358 static inline void ex_assign_manuf_info(struct domain_device *dev, void
 359                                         *_mi_resp)
 360 {
 361         u8 *mi_resp = _mi_resp;
 362         struct sas_rphy *rphy = dev->rphy;
 363         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 364
 365         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 366         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 367         memcpy(edev->product_rev, mi_resp + 36,
 368                SAS_EXPANDER_PRODUCT_REV_LEN);
 369
 370         if (mi_resp[8] & 1) {
 371                 memcpy(edev->component_vendor_id, mi_resp + 40,
 372                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 373                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 374                 edev->component_revision_id = mi_resp[50];
 375         }
 376 }
 377
 378 #define MI_REQ_SIZE   8
 379 #define MI_RESP_SIZE 64
 380
 381 static int sas_ex_manuf_info(struct domain_device *dev)
 382 {
 383         u8 *mi_req;
 384         u8 *mi_resp;
 385         int res;
 386
 387         mi_req = alloc_smp_req(MI_REQ_SIZE);
 388         if (!mi_req)
 389                 return -ENOMEM;
 390
 391         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 392         if (!mi_resp) {
 393                 kfree(mi_req);
 394                 return -ENOMEM;
 395         }
 396
 397         mi_req[1] = SMP_REPORT_MANUF_INFO;
 398
 399         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 400         if (res) {
 401                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 402                             SAS_ADDR(dev->sas_addr), res);
 403                 goto out;
 404         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 405                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 406                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 407                 goto out;
 408         }
 409
 410         ex_assign_manuf_info(dev, mi_resp);
 411 out:
 412         kfree(mi_req);
 413         kfree(mi_resp);
 414         return res;
 415 }
 416
 417 #define PC_REQ_SIZE  44
 418 #define PC_RESP_SIZE 8
 419
 420 static int smp_phy_control(struct domain_device *dev, int phy_id,
 421                            enum phy_func phy_func)
 422 {
 423         u8 *pc_req;
 424         u8 *pc_resp;
 425         int res;
 426
 427         pc_req = alloc_smp_req(PC_REQ_SIZE);
 428         if (!pc_req)
 429                 return -ENOMEM;
 430
 431         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 432         if (!pc_resp) {
 433                 kfree(pc_req);
 434                 return -ENOMEM;
 435         }
 436
 437         pc_req[1] = SMP_PHY_CONTROL;
 438         pc_req[9] = phy_id;
 439         pc_req[10]= phy_func;
 440
 441         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 442
 443         kfree(pc_resp);
 444         kfree(pc_req);
 445         return res;
 446 }
 447
 448 static inline void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 449 {
 450         struct expander_device *ex = &dev->ex_dev;
 451         struct ex_phy *phy = &ex->ex_phy[phy_id];
 452
 453         smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE);
 454         phy->linkrate = PHY_DISABLED;
 455 }
 456
 457 static inline void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 458 {
 459         struct expander_device *ex = &dev->ex_dev;
 460         int i;
 461
 462         for (i = 0; i < ex->num_phys; i++) {
 463                 struct ex_phy *phy = &ex->ex_phy[i];
 464
 465                 if (phy->phy_state == PHY_VACANT ||
 466                     phy->phy_state == PHY_NOT_PRESENT)
 467                         continue;
 468
 469                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 470                         sas_ex_disable_phy(dev, i);
 471         }
 472 }
 473
 474 static inline int sas_dev_present_in_domain(struct sas_port *port,
 475                                             u8 *sas_addr)
 476 {
 477         struct domain_device *dev;
 478
 479         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 480                 return 1;
 481         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 482                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 483                         return 1;
 484         }
 485         return 0;
 486 }
 487
 488 #define RPS_REQ_SIZE  16
 489 #define RPS_RESP_SIZE 60
 490
 491 static inline int sas_get_report_phy_sata(struct domain_device *dev,
 492                                           int phy_id,
 493                                           struct smp_resp *rps_resp)
 494 {
 495         int res;
 496         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 497
 498         if (!rps_req)
 499                 return -ENOMEM;
 500
 501         rps_req[1] = SMP_REPORT_PHY_SATA;
 502         rps_req[9] = phy_id;
 503
 504         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 505                                     rps_resp, RPS_RESP_SIZE);
 506
 507         kfree(rps_req);
 508         return 0;
 509 }
 510
 511 static inline void sas_ex_get_linkrate(struct domain_device *parent,
 512                                        struct domain_device *child,
 513                                        struct ex_phy *parent_phy)
 514 {
 515         struct expander_device *parent_ex = &parent->ex_dev;
 516         int i;
 517
 518         child->pathways = 0;
 519
 520         for (i = 0; i < parent_ex->num_phys; i++) {
 521                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 522
 523                 if (phy->phy_state == PHY_VACANT ||
 524                     phy->phy_state == PHY_NOT_PRESENT)
 525                         continue;
 526
 527                 if (SAS_ADDR(phy->attached_sas_addr) ==
 528                     SAS_ADDR(child->sas_addr)) {
 529
 530                         child->min_linkrate = min(parent->min_linkrate,
 531                                                   phy->linkrate);
 532                         child->max_linkrate = max(parent->max_linkrate,
 533                                                   phy->linkrate);
 534                         child->pathways++;
 535                 }
 536         }
 537         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 538         child->pathways = min(child->pathways, parent->pathways);
 539 }
 540
 541 static struct domain_device *sas_ex_discover_end_dev(
 542         struct domain_device *parent, int phy_id)
 543 {
 544         struct expander_device *parent_ex = &parent->ex_dev;
 545         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 546         struct domain_device *child = NULL;
 547         struct sas_rphy *rphy;
 548         int res;
 549
 550         if (phy->attached_sata_host || phy->attached_sata_ps)
 551                 return NULL;
 552
 553         child = kzalloc(sizeof(*child), GFP_KERNEL);
 554         if (!child)
 555                 return NULL;
 556
 557         child->parent = parent;
 558         child->port   = parent->port;
 559         child->iproto = phy->attached_iproto;
 560         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 561         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 562         sas_ex_get_linkrate(parent, child, phy);
 563
 564         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 565                 child->dev_type = SATA_DEV;
 566                 if (phy->attached_tproto & SAS_PROTO_STP)
 567                         child->tproto = phy->attached_tproto;
 568                 if (phy->attached_sata_dev)
 569                         child->tproto |= SATA_DEV;
 570                 res = sas_get_report_phy_sata(parent, phy_id,
 571                                               &child->sata_dev.rps_resp);
 572                 if (res) {
 573                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 574                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 575                                     phy_id, res);
 576                         kfree(child);
 577                         return NULL;
 578                 }
 579                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 580                        sizeof(struct dev_to_host_fis));
 581                 sas_init_dev(child);
 582                 res = sas_discover_sata(child);
 583                 if (res) {
 584                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 585                                     "%016llx:0x%x returned 0x%x\n",
 586                                     SAS_ADDR(child->sas_addr),
 587                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 588                         kfree(child);
 589                         return NULL;
 590                 }
 591         } else if (phy->attached_tproto & SAS_PROTO_SSP) {
 592                 child->dev_type = SAS_END_DEV;
 593                 rphy = sas_end_device_alloc(phy->phy);
 594                 /* FIXME: error handling */
 595                 BUG_ON(!rphy);
 596                 child->tproto = phy->attached_tproto;
 597                 sas_init_dev(child);
 598
 599                 child->rphy = rphy;
 600                 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
 601                 rphy->identify.device_type = SAS_END_DEVICE;
 602                 rphy->identify.sas_address = SAS_ADDR(child->sas_addr);
 603                 rphy->identify.initiator_port_protocols = child->iproto;
 604                 rphy->identify.target_port_protocols = child->tproto;
 605
 606                 spin_lock(&parent->port->dev_list_lock);
 607                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 608                 spin_unlock(&parent->port->dev_list_lock);
 609
 610                 res = sas_discover_end_dev(child);
 611                 if (res) {
 612                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 613                                     "at %016llx:0x%x returned 0x%x\n",
 614                                     SAS_ADDR(child->sas_addr),
 615                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 616                         kfree(child);
 617                         return NULL;
 618                 }
 619         } else {
 620                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 621                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 622                             phy_id);
 623         }
 624
 625         list_add_tail(&child->siblings, &parent_ex->children);
 626         return child;
 627 }
 628
 629 static struct domain_device *sas_ex_discover_expander(
 630         struct domain_device *parent, int phy_id)
 631 {
 632         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 633         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 634         struct domain_device *child = NULL;
 635         struct sas_rphy *rphy;
 636         struct sas_expander_device *edev;
 637         int res;
 638
 639         if (phy->routing_attr == DIRECT_ROUTING) {
 640                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 641                             "allowed\n",
 642                             SAS_ADDR(parent->sas_addr), phy_id,
 643                             SAS_ADDR(phy->attached_sas_addr),
 644                             phy->attached_phy_id);
 645                 return NULL;
 646         }
 647         child = kzalloc(sizeof(*child), GFP_KERNEL);
 648         if (!child)
 649                 return NULL;
 650         switch (phy->attached_dev_type) {
 651         case EDGE_DEV:
 652                 rphy = sas_expander_alloc(phy->phy, SAS_EDGE_EXPANDER_DEVICE);
 653                 break;
 654         case FANOUT_DEV:
 655                 rphy = sas_expander_alloc(phy->phy, SAS_FANOUT_EXPANDER_DEVICE);
 656                 break;
 657         default:
 658                 rphy = NULL;    /* shut gcc up */
 659                 BUG();
 660         }
 661         child->rphy = rphy;
 662         edev = rphy_to_expander_device(rphy);
 663         child->dev_type = phy->attached_dev_type;
 664         child->parent = parent;
 665         child->port = parent->port;
 666         child->iproto = phy->attached_iproto;
 667         child->tproto = phy->attached_tproto;
 668         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 669         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 670         sas_ex_get_linkrate(parent, child, phy);
 671         edev->level = parent_ex->level + 1;
 672         parent->port->disc.max_level = max(parent->port->disc.max_level,
 673                                            edev->level);
 674         sas_init_dev(child);
 675         res = sas_discover_expander(child);
 676         if (res) {
 677                 kfree(child);
 678                 return NULL;
 679         }
 680         return child;
 681 }
 682
 683 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 684 {
 685         struct expander_device *ex = &dev->ex_dev;
 686         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 687         struct domain_device *child = NULL;
 688         int res = 0;
 689
 690         /* Phy state */
 691         if (ex_phy->linkrate == PHY_SPINUP_HOLD) {
 692                 if (!smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET))
 693                         res = sas_ex_phy_discover(dev, phy_id);
 694                 if (res)
 695                         return res;
 696         }
 697
 698         /* Parent and domain coherency */
 699         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 700                              SAS_ADDR(dev->port->sas_addr)))
 701                 return 0;
 702         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 703                             SAS_ADDR(dev->parent->sas_addr)))
 704                 return 0;
 705         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 706                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 707
 708         if (ex_phy->attached_dev_type == NO_DEVICE) {
 709                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 710                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 711                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 712                 }
 713                 return 0;
 714         } else if (ex_phy->linkrate == PHY_LINKRATE_UNKNOWN)
 715                 return 0;
 716
 717         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 718             ex_phy->attached_dev_type != FANOUT_DEV &&
 719             ex_phy->attached_dev_type != EDGE_DEV) {
 720                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 721                             "phy 0x%x\n", ex_phy->attached_dev_type,
 722                             SAS_ADDR(dev->sas_addr),
 723                             phy_id);
 724                 return 0;
 725         }
 726
 727         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 728         if (res) {
 729                 SAS_DPRINTK("configure routing for dev %016llx "
 730                             "reported 0x%x. Forgotten\n",
 731                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 732                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 733                 return res;
 734         }
 735
 736         switch (ex_phy->attached_dev_type) {
 737         case SAS_END_DEV:
 738                 child = sas_ex_discover_end_dev(dev, phy_id);
 739                 break;
 740         case FANOUT_DEV:
 741                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 742                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 743                                     "attached to ex %016llx phy 0x%x\n",
 744                                     SAS_ADDR(ex_phy->attached_sas_addr),
 745                                     ex_phy->attached_phy_id,
 746                                     SAS_ADDR(dev->sas_addr),
 747                                     phy_id);
 748                         sas_ex_disable_phy(dev, phy_id);
 749                         break;
 750                 } else
 751                         memcpy(dev->port->disc.fanout_sas_addr,
 752                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 753                 /* fallthrough */
 754         case EDGE_DEV:
 755                 child = sas_ex_discover_expander(dev, phy_id);
 756                 break;
 757         default:
 758                 break;
 759         }
 760
 761         if (child) {
 762                 int i;
 763
 764                 for (i = 0; i < ex->num_phys; i++) {
 765                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 766                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 767                                 continue;
 768
 769                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 770                             SAS_ADDR(child->sas_addr))
 771                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 772                 }
 773         }
 774
 775         return res;
 776 }
 777
 778 static inline int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 779 {
 780         struct expander_device *ex = &dev->ex_dev;
 781         int i;
 782
 783         for (i = 0; i < ex->num_phys; i++) {
 784                 struct ex_phy *phy = &ex->ex_phy[i];
 785
 786                 if (phy->phy_state == PHY_VACANT ||
 787                     phy->phy_state == PHY_NOT_PRESENT)
 788                         continue;
 789
 790                 if ((phy->attached_dev_type == EDGE_DEV ||
 791                      phy->attached_dev_type == FANOUT_DEV) &&
 792                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 793
 794                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 795
 796                         return 1;
 797                 }
 798         }
 799         return 0;
 800 }
 801
 802 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 803 {
 804         struct expander_device *ex = &dev->ex_dev;
 805         struct domain_device *child;
 806         u8 sub_addr[8] = {0, };
 807
 808         list_for_each_entry(child, &ex->children, siblings) {
 809                 if (child->dev_type != EDGE_DEV &&
 810                     child->dev_type != FANOUT_DEV)
 811                         continue;
 812                 if (sub_addr[0] == 0) {
 813                         sas_find_sub_addr(child, sub_addr);
 814                         continue;
 815                 } else {
 816                         u8 s2[8];
 817
 818                         if (sas_find_sub_addr(child, s2) &&
 819                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 820
 821                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 822                                             "diverges from subtractive "
 823                                             "boundary %016llx\n",
 824                                             SAS_ADDR(dev->sas_addr),
 825                                             SAS_ADDR(child->sas_addr),
 826                                             SAS_ADDR(s2),
 827                                             SAS_ADDR(sub_addr));
 828
 829                                 sas_ex_disable_port(child, s2);
 830                         }
 831                 }
 832         }
 833         return 0;
 834 }
 835 /**
 836  * sas_ex_discover_devices -- discover devices attached to this expander
 837  * dev: pointer to the expander domain device
 838  * single: if you want to do a single phy, else set to -1;
 839  *
 840  * Configure this expander for use with its devices and register the
 841  * devices of this expander.
 842  */
 843 static int sas_ex_discover_devices(struct domain_device *dev, int single)
 844 {
 845         struct expander_device *ex = &dev->ex_dev;
 846         int i = 0, end = ex->num_phys;
 847         int res = 0;
 848
 849         if (0 <= single && single < end) {
 850                 i = single;
 851                 end = i+1;
 852         }
 853
 854         for ( ; i < end; i++) {
 855                 struct ex_phy *ex_phy = &ex->ex_phy[i];
 856
 857                 if (ex_phy->phy_state == PHY_VACANT ||
 858                     ex_phy->phy_state == PHY_NOT_PRESENT ||
 859                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
 860                         continue;
 861
 862                 switch (ex_phy->linkrate) {
 863                 case PHY_DISABLED:
 864                 case PHY_RESET_PROBLEM:
 865                 case PHY_PORT_SELECTOR:
 866                         continue;
 867                 default:
 868                         res = sas_ex_discover_dev(dev, i);
 869                         if (res)
 870                                 break;
 871                         continue;
 872                 }
 873         }
 874
 875         if (!res)
 876                 sas_check_level_subtractive_boundary(dev);
 877
 878         return res;
 879 }
 880
 881 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
 882 {
 883         struct expander_device *ex = &dev->ex_dev;
 884         int i;
 885         u8  *sub_sas_addr = NULL;
 886
 887         if (dev->dev_type != EDGE_DEV)
 888                 return 0;
 889
 890         for (i = 0; i < ex->num_phys; i++) {
 891                 struct ex_phy *phy = &ex->ex_phy[i];
 892
 893                 if (phy->phy_state == PHY_VACANT ||
 894                     phy->phy_state == PHY_NOT_PRESENT)
 895                         continue;
 896
 897                 if ((phy->attached_dev_type == FANOUT_DEV ||
 898                      phy->attached_dev_type == EDGE_DEV) &&
 899                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 900
 901                         if (!sub_sas_addr)
 902                                 sub_sas_addr = &phy->attached_sas_addr[0];
 903                         else if (SAS_ADDR(sub_sas_addr) !=
 904                                  SAS_ADDR(phy->attached_sas_addr)) {
 905
 906                                 SAS_DPRINTK("ex %016llx phy 0x%x "
 907                                             "diverges(%016llx) on subtractive "
 908                                             "boundary(%016llx). Disabled\n",
 909                                             SAS_ADDR(dev->sas_addr), i,
 910                                             SAS_ADDR(phy->attached_sas_addr),
 911                                             SAS_ADDR(sub_sas_addr));
 912                                 sas_ex_disable_phy(dev, i);
 913                         }
 914                 }
 915         }
 916         return 0;
 917 }
 918
 919 static inline void sas_print_parent_topology_bug(struct domain_device *child,
 920                                                  struct ex_phy *parent_phy,
 921                                                  struct ex_phy *child_phy)
 922 {
 923         static const char ra_char[] = {
 924                 [DIRECT_ROUTING] = 'D',
 925                 [SUBTRACTIVE_ROUTING] = 'S',
 926                 [TABLE_ROUTING] = 'T',
 927         };
 928         static const char *ex_type[] = {
 929                 [EDGE_DEV] = "edge",
 930                 [FANOUT_DEV] = "fanout",
 931         };
 932         struct domain_device *parent = child->parent;
 933
 934         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
 935                    "has %c:%c routing link!\n",
 936
 937                    ex_type[parent->dev_type],
 938                    SAS_ADDR(parent->sas_addr),
 939                    parent_phy->phy_id,
 940
 941                    ex_type[child->dev_type],
 942                    SAS_ADDR(child->sas_addr),
 943                    child_phy->phy_id,
 944
 945                    ra_char[parent_phy->routing_attr],
 946                    ra_char[child_phy->routing_attr]);
 947 }
 948
 949 static inline int sas_check_eeds(struct domain_device *child,
 950                                  struct ex_phy *parent_phy,
 951                                  struct ex_phy *child_phy)
 952 {
 953         int res = 0;
 954         struct domain_device *parent = child->parent;
 955
 956         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
 957                 res = -ENODEV;
 958                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
 959                             "phy S:0x%x, while there is a fanout ex %016llx\n",
 960                             SAS_ADDR(parent->sas_addr),
 961                             parent_phy->phy_id,
 962                             SAS_ADDR(child->sas_addr),
 963                             child_phy->phy_id,
 964                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
 965         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
 966                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
 967                        SAS_ADDR_SIZE);
 968                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
 969                        SAS_ADDR_SIZE);
 970         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
 971                     SAS_ADDR(parent->sas_addr)) ||
 972                    (SAS_ADDR(parent->port->disc.eeds_a) ==
 973                     SAS_ADDR(child->sas_addr)))
 974                    &&
 975                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
 976                      SAS_ADDR(parent->sas_addr)) ||
 977                     (SAS_ADDR(parent->port->disc.eeds_b) ==
 978                      SAS_ADDR(child->sas_addr))))
 979                 ;
 980         else {
 981                 res = -ENODEV;
 982                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
 983                             "phy 0x%x link forms a third EEDS!\n",
 984                             SAS_ADDR(parent->sas_addr),
 985                             parent_phy->phy_id,
 986                             SAS_ADDR(child->sas_addr),
 987                             child_phy->phy_id);
 988         }
 989
 990         return res;
 991 }
 992
 993 /* Here we spill over 80 columns.  It is intentional.
 994  */
 995 static int sas_check_parent_topology(struct domain_device *child)
 996 {
 997         struct expander_device *child_ex = &child->ex_dev;
 998         struct expander_device *parent_ex;
 999         int i;
1000         int res = 0;
1001
1002         if (!child->parent)
1003                 return 0;
1004
1005         if (child->parent->dev_type != EDGE_DEV &&
1006             child->parent->dev_type != FANOUT_DEV)
1007                 return 0;
1008
1009         parent_ex = &child->parent->ex_dev;
1010
1011         for (i = 0; i < parent_ex->num_phys; i++) {
1012                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1013                 struct ex_phy *child_phy;
1014
1015                 if (parent_phy->phy_state == PHY_VACANT ||
1016                     parent_phy->phy_state == PHY_NOT_PRESENT)
1017                         continue;
1018
1019                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1020                         continue;
1021
1022                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1023
1024                 switch (child->parent->dev_type) {
1025                 case EDGE_DEV:
1026                         if (child->dev_type == FANOUT_DEV) {
1027                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1028                                     child_phy->routing_attr != TABLE_ROUTING) {
1029                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1030                                         res = -ENODEV;
1031                                 }
1032                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1033                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1034                                         res = sas_check_eeds(child, parent_phy, child_phy);
1035                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1036                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1037                                         res = -ENODEV;
1038                                 }
1039                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1040                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1041                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1042                                 res = -ENODEV;
1043                         }
1044                         break;
1045                 case FANOUT_DEV:
1046                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1047                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1048                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1049                                 res = -ENODEV;
1050                         }
1051                         break;
1052                 default:
1053                         break;
1054                 }
1055         }
1056
1057         return res;
1058 }
1059
1060 #define RRI_REQ_SIZE  16
1061 #define RRI_RESP_SIZE 44
1062
1063 static int sas_configure_present(struct domain_device *dev, int phy_id,
1064                                  u8 *sas_addr, int *index, int *present)
1065 {
1066         int i, res = 0;
1067         struct expander_device *ex = &dev->ex_dev;
1068         struct ex_phy *phy = &ex->ex_phy[phy_id];
1069         u8 *rri_req;
1070         u8 *rri_resp;
1071
1072         *present = 0;
1073         *index = 0;
1074
1075         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1076         if (!rri_req)
1077                 return -ENOMEM;
1078
1079         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1080         if (!rri_resp) {
1081                 kfree(rri_req);
1082                 return -ENOMEM;
1083         }
1084
1085         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1086         rri_req[9] = phy_id;
1087
1088         for (i = 0; i < ex->max_route_indexes ; i++) {
1089                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1090                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1091                                        RRI_RESP_SIZE);
1092                 if (res)
1093                         goto out;
1094                 res = rri_resp[2];
1095                 if (res == SMP_RESP_NO_INDEX) {
1096                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1097                                     "phy 0x%x index 0x%x\n",
1098                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1099                         goto out;
1100                 } else if (res != SMP_RESP_FUNC_ACC) {
1101                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1102                                     "result 0x%x\n", __FUNCTION__,
1103                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1104                         goto out;
1105                 }
1106                 if (SAS_ADDR(sas_addr) != 0) {
1107                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1108                                 *index = i;
1109                                 if ((rri_resp[12] & 0x80) == 0x80)
1110                                         *present = 0;
1111                                 else
1112                                         *present = 1;
1113                                 goto out;
1114                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1115                                 *index = i;
1116                                 *present = 0;
1117                                 goto out;
1118                         }
1119                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1120                            phy->last_da_index < i) {
1121                         phy->last_da_index = i;
1122                         *index = i;
1123                         *present = 0;
1124                         goto out;
1125                 }
1126         }
1127         res = -1;
1128 out:
1129         kfree(rri_req);
1130         kfree(rri_resp);
1131         return res;
1132 }
1133
1134 #define CRI_REQ_SIZE  44
1135 #define CRI_RESP_SIZE  8
1136
1137 static int sas_configure_set(struct domain_device *dev, int phy_id,
1138                              u8 *sas_addr, int index, int include)
1139 {
1140         int res;
1141         u8 *cri_req;
1142         u8 *cri_resp;
1143
1144         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1145         if (!cri_req)
1146                 return -ENOMEM;
1147
1148         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1149         if (!cri_resp) {
1150                 kfree(cri_req);
1151                 return -ENOMEM;
1152         }
1153
1154         cri_req[1] = SMP_CONF_ROUTE_INFO;
1155         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1156         cri_req[9] = phy_id;
1157         if (SAS_ADDR(sas_addr) == 0 || !include)
1158                 cri_req[12] |= 0x80;
1159         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1160
1161         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1162                                CRI_RESP_SIZE);
1163         if (res)
1164                 goto out;
1165         res = cri_resp[2];
1166         if (res == SMP_RESP_NO_INDEX) {
1167                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1168                             "index 0x%x\n",
1169                             SAS_ADDR(dev->sas_addr), phy_id, index);
1170         }
1171 out:
1172         kfree(cri_req);
1173         kfree(cri_resp);
1174         return res;
1175 }
1176
1177 static inline int sas_configure_phy(struct domain_device *dev, int phy_id,
1178                                     u8 *sas_addr, int include)
1179 {
1180         int index;
1181         int present;
1182         int res;
1183
1184         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1185         if (res)
1186                 return res;
1187         if (include ^ present)
1188                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1189
1190         return res;
1191 }
1192
1193 /**
1194  * sas_configure_parent -- configure routing table of parent
1195  * parent: parent expander
1196  * child: child expander
1197  * sas_addr: SAS port identifier of device directly attached to child
1198  */
1199 static int sas_configure_parent(struct domain_device *parent,
1200                                 struct domain_device *child,
1201                                 u8 *sas_addr, int include)
1202 {
1203         struct expander_device *ex_parent = &parent->ex_dev;
1204         int res = 0;
1205         int i;
1206
1207         if (parent->parent) {
1208                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1209                                            include);
1210                 if (res)
1211                         return res;
1212         }
1213
1214         if (ex_parent->conf_route_table == 0) {
1215                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1216                             SAS_ADDR(parent->sas_addr));
1217                 return 0;
1218         }
1219
1220         for (i = 0; i < ex_parent->num_phys; i++) {
1221                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1222
1223                 if ((phy->routing_attr == TABLE_ROUTING) &&
1224                     (SAS_ADDR(phy->attached_sas_addr) ==
1225                      SAS_ADDR(child->sas_addr))) {
1226                         res = sas_configure_phy(parent, i, sas_addr, include);
1227                         if (res)
1228                                 return res;
1229                 }
1230         }
1231
1232         return res;
1233 }
1234
1235 /**
1236  * sas_configure_routing -- configure routing
1237  * dev: expander device
1238  * sas_addr: port identifier of device directly attached to the expander device
1239  */
1240 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1241 {
1242         if (dev->parent)
1243                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1244         return 0;
1245 }
1246
1247 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1248 {
1249         if (dev->parent)
1250                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1251         return 0;
1252 }
1253
1254 #if 0
1255 #define SMP_BIN_ATTR_NAME "smp_portal"
1256
1257 static void sas_ex_smp_hook(struct domain_device *dev)
1258 {
1259         struct expander_device *ex_dev = &dev->ex_dev;
1260         struct bin_attribute *bin_attr = &ex_dev->smp_bin_attr;
1261
1262         memset(bin_attr, 0, sizeof(*bin_attr));
1263
1264         bin_attr->attr.name = SMP_BIN_ATTR_NAME;
1265         bin_attr->attr.owner = THIS_MODULE;
1266         bin_attr->attr.mode = 0600;
1267
1268         bin_attr->size = 0;
1269         bin_attr->private = NULL;
1270         bin_attr->read = smp_portal_read;
1271         bin_attr->write= smp_portal_write;
1272         bin_attr->mmap = NULL;
1273
1274         ex_dev->smp_portal_pid = -1;
1275         init_MUTEX(&ex_dev->smp_sema);
1276 }
1277 #endif
1278
1279 /**
1280  * sas_discover_expander -- expander discovery
1281  * @ex: pointer to expander domain device
1282  *
1283  * See comment in sas_discover_sata().
1284  */
1285 static int sas_discover_expander(struct domain_device *dev)
1286 {
1287         int res;
1288
1289         res = sas_notify_lldd_dev_found(dev);
1290         if (res)
1291                 return res;
1292
1293         res = sas_ex_general(dev);
1294         if (res)
1295                 goto out_err;
1296         res = sas_ex_manuf_info(dev);
1297         if (res)
1298                 goto out_err;
1299
1300         res = sas_expander_discover(dev);
1301         if (res) {
1302                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1303                             SAS_ADDR(dev->sas_addr), res);
1304                 goto out_err;
1305         }
1306
1307         sas_check_ex_subtractive_boundary(dev);
1308         res = sas_check_parent_topology(dev);
1309         if (res)
1310                 goto out_err;
1311         return 0;
1312 out_err:
1313         sas_notify_lldd_dev_gone(dev);
1314         return res;
1315 }
1316
1317 static int sas_ex_level_discovery(struct sas_port *port, const int level)
1318 {
1319         int res = 0;
1320         struct domain_device *dev;
1321
1322         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1323                 if (dev->dev_type == EDGE_DEV ||
1324                     dev->dev_type == FANOUT_DEV) {
1325                         struct sas_expander_device *ex =
1326                                 rphy_to_expander_device(dev->rphy);
1327
1328                         if (level == ex->level)
1329                                 res = sas_ex_discover_devices(dev, -1);
1330                 }
1331         }
1332
1333         return res;
1334 }
1335
1336 static int sas_ex_bfs_disc(struct sas_port *port)
1337 {
1338         int res;
1339         int level;
1340
1341         do {
1342                 level = port->disc.max_level;
1343                 res = sas_ex_level_discovery(port, level);
1344                 mb();
1345         } while (level < port->disc.max_level);
1346
1347         return res;
1348 }
1349
1350 int sas_discover_root_expander(struct domain_device *dev)
1351 {
1352         int res;
1353         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1354
1355         sas_rphy_add(dev->rphy);
1356
1357         ex->level = dev->port->disc.max_level; /* 0 */
1358         res = sas_discover_expander(dev);
1359         if (!res)
1360                 sas_ex_bfs_disc(dev->port);
1361
1362         return res;
1363 }
1364
1365 /* ---------- Domain revalidation ---------- */
1366
1367 static int sas_get_phy_discover(struct domain_device *dev,
1368                                 int phy_id, struct smp_resp *disc_resp)
1369 {
1370         int res;
1371         u8 *disc_req;
1372
1373         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1374         if (!disc_req)
1375                 return -ENOMEM;
1376
1377         disc_req[1] = SMP_DISCOVER;
1378         disc_req[9] = phy_id;
1379
1380         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1381                                disc_resp, DISCOVER_RESP_SIZE);
1382         if (res)
1383                 goto out;
1384         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1385                 res = disc_resp->result;
1386                 goto out;
1387         }
1388 out:
1389         kfree(disc_req);
1390         return res;
1391 }
1392
1393 static int sas_get_phy_change_count(struct domain_device *dev,
1394                                     int phy_id, int *pcc)
1395 {
1396         int res;
1397         struct smp_resp *disc_resp;
1398
1399         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1400         if (!disc_resp)
1401                 return -ENOMEM;
1402
1403         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1404         if (!res)
1405                 *pcc = disc_resp->disc.change_count;
1406
1407         kfree(disc_resp);
1408         return res;
1409 }
1410
1411 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1412                                          int phy_id, u8 *attached_sas_addr)
1413 {
1414         int res;
1415         struct smp_resp *disc_resp;
1416
1417         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1418         if (!disc_resp)
1419                 return -ENOMEM;
1420
1421         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1422         if (!res)
1423                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1424
1425         kfree(disc_resp);
1426         return res;
1427 }
1428
1429 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1430                               int from_phy)
1431 {
1432         struct expander_device *ex = &dev->ex_dev;
1433         int res = 0;
1434         int i;
1435
1436         for (i = from_phy; i < ex->num_phys; i++) {
1437                 int phy_change_count = 0;
1438
1439                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1440                 if (res)
1441                         goto out;
1442                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1443                         ex->ex_phy[i].phy_change_count = phy_change_count;
1444                         *phy_id = i;
1445                         return 0;
1446                 }
1447         }
1448 out:
1449         return res;
1450 }
1451
1452 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1453 {
1454         int res;
1455         u8  *rg_req;
1456         struct smp_resp  *rg_resp;
1457
1458         rg_req = alloc_smp_req(RG_REQ_SIZE);
1459         if (!rg_req)
1460                 return -ENOMEM;
1461
1462         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1463         if (!rg_resp) {
1464                 kfree(rg_req);
1465                 return -ENOMEM;
1466         }
1467
1468         rg_req[1] = SMP_REPORT_GENERAL;
1469
1470         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1471                                RG_RESP_SIZE);
1472         if (res)
1473                 goto out;
1474         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1475                 res = rg_resp->result;
1476                 goto out;
1477         }
1478
1479         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1480 out:
1481         kfree(rg_resp);
1482         kfree(rg_req);
1483         return res;
1484 }
1485
1486 static int sas_find_bcast_dev(struct domain_device *dev,
1487                               struct domain_device **src_dev)
1488 {
1489         struct expander_device *ex = &dev->ex_dev;
1490         int ex_change_count = -1;
1491         int res;
1492
1493         res = sas_get_ex_change_count(dev, &ex_change_count);
1494         if (res)
1495                 goto out;
1496         if (ex_change_count != -1 &&
1497             ex_change_count != ex->ex_change_count) {
1498                 *src_dev = dev;
1499                 ex->ex_change_count = ex_change_count;
1500         } else {
1501                 struct domain_device *ch;
1502
1503                 list_for_each_entry(ch, &ex->children, siblings) {
1504                         if (ch->dev_type == EDGE_DEV ||
1505                             ch->dev_type == FANOUT_DEV) {
1506                                 res = sas_find_bcast_dev(ch, src_dev);
1507                                 if (src_dev)
1508                                         return res;
1509                         }
1510                 }
1511         }
1512 out:
1513         return res;
1514 }
1515
1516 static void sas_unregister_ex_tree(struct domain_device *dev)
1517 {
1518         struct expander_device *ex = &dev->ex_dev;
1519         struct domain_device *child, *n;
1520
1521         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1522                 if (child->dev_type == EDGE_DEV ||
1523                     child->dev_type == FANOUT_DEV)
1524                         sas_unregister_ex_tree(child);
1525                 else
1526                         sas_unregister_dev(child);
1527         }
1528         sas_unregister_dev(dev);
1529 }
1530
1531 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1532                                          int phy_id)
1533 {
1534         struct expander_device *ex_dev = &parent->ex_dev;
1535         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1536         struct domain_device *child, *n;
1537
1538         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1539                 if (SAS_ADDR(child->sas_addr) ==
1540                     SAS_ADDR(phy->attached_sas_addr)) {
1541                         if (child->dev_type == EDGE_DEV ||
1542                             child->dev_type == FANOUT_DEV)
1543                                 sas_unregister_ex_tree(child);
1544                         else
1545                                 sas_unregister_dev(child);
1546                         break;
1547                 }
1548         }
1549         sas_disable_routing(parent, phy->attached_sas_addr);
1550         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1551 }
1552
1553 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1554                                           const int level)
1555 {
1556         struct expander_device *ex_root = &root->ex_dev;
1557         struct domain_device *child;
1558         int res = 0;
1559
1560         list_for_each_entry(child, &ex_root->children, siblings) {
1561                 if (child->dev_type == EDGE_DEV ||
1562                     child->dev_type == FANOUT_DEV) {
1563                         struct sas_expander_device *ex =
1564                                 rphy_to_expander_device(child->rphy);
1565
1566                         if (level > ex->level)
1567                                 res = sas_discover_bfs_by_root_level(child,
1568                                                                      level);
1569                         else if (level == ex->level)
1570                                 res = sas_ex_discover_devices(child, -1);
1571                 }
1572         }
1573         return res;
1574 }
1575
1576 static int sas_discover_bfs_by_root(struct domain_device *dev)
1577 {
1578         int res;
1579         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1580         int level = ex->level+1;
1581
1582         res = sas_ex_discover_devices(dev, -1);
1583         if (res)
1584                 goto out;
1585         do {
1586                 res = sas_discover_bfs_by_root_level(dev, level);
1587                 mb();
1588                 level += 1;
1589         } while (level <= dev->port->disc.max_level);
1590 out:
1591         return res;
1592 }
1593
1594 static inline int sas_discover_new(struct domain_device *dev, int phy_id)
1595 {
1596         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1597         struct domain_device *child;
1598         int res;
1599
1600         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1601                     SAS_ADDR(dev->sas_addr), phy_id);
1602         res = sas_ex_phy_discover(dev, phy_id);
1603         if (res)
1604                 goto out;
1605         res = sas_ex_discover_devices(dev, phy_id);
1606         if (res)
1607                 goto out;
1608         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1609                 if (SAS_ADDR(child->sas_addr) ==
1610                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1611                         if (child->dev_type == EDGE_DEV ||
1612                             child->dev_type == FANOUT_DEV)
1613                                 res = sas_discover_bfs_by_root(child);
1614                         break;
1615                 }
1616         }
1617 out:
1618         return res;
1619 }
1620
1621 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1622 {
1623         struct expander_device *ex = &dev->ex_dev;
1624         struct ex_phy *phy = &ex->ex_phy[phy_id];
1625         u8 attached_sas_addr[8];
1626         int res;
1627
1628         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1629         switch (res) {
1630         case SMP_RESP_NO_PHY:
1631                 phy->phy_state = PHY_NOT_PRESENT;
1632                 sas_unregister_devs_sas_addr(dev, phy_id);
1633                 goto out; break;
1634         case SMP_RESP_PHY_VACANT:
1635                 phy->phy_state = PHY_VACANT;
1636                 sas_unregister_devs_sas_addr(dev, phy_id);
1637                 goto out; break;
1638         case SMP_RESP_FUNC_ACC:
1639                 break;
1640         }
1641
1642         if (SAS_ADDR(attached_sas_addr) == 0) {
1643                 phy->phy_state = PHY_EMPTY;
1644                 sas_unregister_devs_sas_addr(dev, phy_id);
1645         } else if (SAS_ADDR(attached_sas_addr) ==
1646                    SAS_ADDR(phy->attached_sas_addr)) {
1647                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1648                             SAS_ADDR(dev->sas_addr), phy_id);
1649         } else
1650                 res = sas_discover_new(dev, phy_id);
1651 out:
1652         return res;
1653 }
1654
1655 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1656 {
1657         struct expander_device *ex = &dev->ex_dev;
1658         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1659         int res = 0;
1660         int i;
1661
1662         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1663                     SAS_ADDR(dev->sas_addr), phy_id);
1664
1665         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1666                 for (i = 0; i < ex->num_phys; i++) {
1667                         struct ex_phy *phy = &ex->ex_phy[i];
1668
1669                         if (i == phy_id)
1670                                 continue;
1671                         if (SAS_ADDR(phy->attached_sas_addr) ==
1672                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1673                                 SAS_DPRINTK("phy%d part of wide port with "
1674                                             "phy%d\n", phy_id, i);
1675                                 goto out;
1676                         }
1677                 }
1678                 res = sas_rediscover_dev(dev, phy_id);
1679         } else
1680                 res = sas_discover_new(dev, phy_id);
1681 out:
1682         return res;
1683 }
1684
1685 /**
1686  * sas_revalidate_domain -- revalidate the domain
1687  * @port: port to the domain of interest
1688  *
1689  * NOTE: this process _must_ quit (return) as soon as any connection
1690  * errors are encountered.  Connection recovery is done elsewhere.
1691  * Discover process only interrogates devices in order to discover the
1692  * domain.
1693  */
1694 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1695 {
1696         int res;
1697         struct domain_device *dev = NULL;
1698
1699         res = sas_find_bcast_dev(port_dev, &dev);
1700         if (res)
1701                 goto out;
1702         if (dev) {
1703                 struct expander_device *ex = &dev->ex_dev;
1704                 int i = 0, phy_id;
1705
1706                 do {
1707                         phy_id = -1;
1708                         res = sas_find_bcast_phy(dev, &phy_id, i);
1709                         if (phy_id == -1)
1710                                 break;
1711                         res = sas_rediscover(dev, phy_id);
1712                         i = phy_id + 1;
1713                 } while (i < ex->num_phys);
1714         }
1715 out:
1716         return res;
1717 }
1718
1719 #if 0
1720 /* ---------- SMP portal ---------- */
1721
1722 static ssize_t smp_portal_write(struct kobject *kobj, char *buf, loff_t offs,
1723                                 size_t size)
1724 {
1725         struct domain_device *dev = to_dom_device(kobj);
1726         struct expander_device *ex = &dev->ex_dev;
1727
1728         if (offs != 0)
1729                 return -EFBIG;
1730         else if (size == 0)
1731                 return 0;
1732
1733         down_interruptible(&ex->smp_sema);
1734         if (ex->smp_req)
1735                 kfree(ex->smp_req);
1736         ex->smp_req = kzalloc(size, GFP_USER);
1737         if (!ex->smp_req) {
1738                 up(&ex->smp_sema);
1739                 return -ENOMEM;
1740         }
1741         memcpy(ex->smp_req, buf, size);
1742         ex->smp_req_size = size;
1743         ex->smp_portal_pid = current->pid;
1744         up(&ex->smp_sema);
1745
1746         return size;
1747 }
1748
1749 static ssize_t smp_portal_read(struct kobject *kobj, char *buf, loff_t offs,
1750                                size_t size)
1751 {
1752         struct domain_device *dev = to_dom_device(kobj);
1753         struct expander_device *ex = &dev->ex_dev;
1754         u8 *smp_resp;
1755         int res = -EINVAL;
1756
1757         /* XXX: sysfs gives us an offset of 0x10 or 0x8 while in fact
1758          *  it should be 0.
1759          */
1760
1761         down_interruptible(&ex->smp_sema);
1762         if (!ex->smp_req || ex->smp_portal_pid != current->pid)
1763                 goto out;
1764
1765         res = 0;
1766         if (size == 0)
1767                 goto out;
1768
1769         res = -ENOMEM;
1770         smp_resp = alloc_smp_resp(size);
1771         if (!smp_resp)
1772                 goto out;
1773         res = smp_execute_task(dev, ex->smp_req, ex->smp_req_size,
1774                                smp_resp, size);
1775         if (!res) {
1776                 memcpy(buf, smp_resp, size);
1777                 res = size;
1778         }
1779
1780         kfree(smp_resp);
1781 out:
1782         kfree(ex->smp_req);
1783         ex->smp_req = NULL;
1784         ex->smp_req_size = 0;
1785         ex->smp_portal_pid = -1;
1786         up(&ex->smp_sema);
1787         return res;
1788 }
1789 #endif