drivers/scsi/libsas/sas_expander.c

   1 /*
   2  * Serial Attached SCSI (SAS) Expander discovery and configuration
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22  *
  23  */
  24
  25 #include <linux/scatterlist.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/slab.h>
  28
  29 #include "sas_internal.h"
  30
  31 #include <scsi/scsi_transport.h>
  32 #include <scsi/scsi_transport_sas.h>
  33 #include "../scsi_sas_internal.h"
  34
  35 static int sas_discover_expander(struct domain_device *dev);
  36 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  37 static int sas_configure_phy(struct domain_device *dev, int phy_id,
  38                              u8 *sas_addr, int include);
  39 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  40
  41 /* ---------- SMP task management ---------- */
  42
  43 static void smp_task_timedout(unsigned long _task)
  44 {
  45         struct sas_task *task = (void *) _task;
  46         unsigned long flags;
  47
  48         spin_lock_irqsave(&task->task_state_lock, flags);
  49         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  50                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  51         spin_unlock_irqrestore(&task->task_state_lock, flags);
  52
  53         complete(&task->completion);
  54 }
  55
  56 static void smp_task_done(struct sas_task *task)
  57 {
  58         if (!del_timer(&task->timer))
  59                 return;
  60         complete(&task->completion);
  61 }
  62
  63 /* Give it some long enough timeout. In seconds. */
  64 #define SMP_TIMEOUT 10
  65
  66 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
  67                             void *resp, int resp_size)
  68 {
  69         int res, retry;
  70         struct sas_task *task = NULL;
  71         struct sas_internal *i =
  72                 to_sas_internal(dev->port->ha->core.shost->transportt);
  73
  74         for (retry = 0; retry < 3; retry++) {
  75                 task = sas_alloc_task(GFP_KERNEL);
  76                 if (!task)
  77                         return -ENOMEM;
  78
  79                 task->dev = dev;
  80                 task->task_proto = dev->tproto;
  81                 sg_init_one(&task->smp_task.smp_req, req, req_size);
  82                 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  83
  84                 task->task_done = smp_task_done;
  85
  86                 task->timer.data = (unsigned long) task;
  87                 task->timer.function = smp_task_timedout;
  88                 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  89                 add_timer(&task->timer);
  90
  91                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  92
  93                 if (res) {
  94                         del_timer(&task->timer);
  95                         SAS_DPRINTK("executing SMP task failed:%d\n", res);
  96                         goto ex_err;
  97                 }
  98
  99                 wait_for_completion(&task->completion);
 100                 res = -ECOMM;
 101                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 102                         SAS_DPRINTK("smp task timed out or aborted\n");
 103                         i->dft->lldd_abort_task(task);
 104                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 105                                 SAS_DPRINTK("SMP task aborted and not done\n");
 106                                 goto ex_err;
 107                         }
 108                 }
 109                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 110                     task->task_status.stat == SAM_STAT_GOOD) {
 111                         res = 0;
 112                         break;
 113                 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
 114                       task->task_status.stat == SAS_DATA_UNDERRUN) {
 115                         /* no error, but return the number of bytes of
 116                          * underrun */
 117                         res = task->task_status.residual;
 118                         break;
 119                 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
 120                       task->task_status.stat == SAS_DATA_OVERRUN) {
 121                         res = -EMSGSIZE;
 122                         break;
 123                 } else {
 124                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 125                                     "status 0x%x\n", __func__,
 126                                     SAS_ADDR(dev->sas_addr),
 127                                     task->task_status.resp,
 128                                     task->task_status.stat);
 129                         sas_free_task(task);
 130                         task = NULL;
 131                 }
 132         }
 133 ex_err:
 134         BUG_ON(retry == 3 && task != NULL);
 135         if (task != NULL) {
 136                 sas_free_task(task);
 137         }
 138         return res;
 139 }
 140
 141 /* ---------- Allocations ---------- */
 142
 143 static inline void *alloc_smp_req(int size)
 144 {
 145         u8 *p = kzalloc(size, GFP_KERNEL);
 146         if (p)
 147                 p[0] = SMP_REQUEST;
 148         return p;
 149 }
 150
 151 static inline void *alloc_smp_resp(int size)
 152 {
 153         return kzalloc(size, GFP_KERNEL);
 154 }
 155
 156 /* ---------- Expander configuration ---------- */
 157
 158 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 159                            void *disc_resp)
 160 {
 161         struct expander_device *ex = &dev->ex_dev;
 162         struct ex_phy *phy = &ex->ex_phy[phy_id];
 163         struct smp_resp *resp = disc_resp;
 164         struct discover_resp *dr = &resp->disc;
 165         struct sas_rphy *rphy = dev->rphy;
 166         int rediscover = (phy->phy != NULL);
 167
 168         if (!rediscover) {
 169                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 170
 171                 /* FIXME: error_handling */
 172                 BUG_ON(!phy->phy);
 173         }
 174
 175         switch (resp->result) {
 176         case SMP_RESP_PHY_VACANT:
 177                 phy->phy_state = PHY_VACANT;
 178                 break;
 179         default:
 180                 phy->phy_state = PHY_NOT_PRESENT;
 181                 break;
 182         case SMP_RESP_FUNC_ACC:
 183                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 184                 break;
 185         }
 186
 187         phy->phy_id = phy_id;
 188         phy->attached_dev_type = dr->attached_dev_type;
 189         phy->linkrate = dr->linkrate;
 190         phy->attached_sata_host = dr->attached_sata_host;
 191         phy->attached_sata_dev  = dr->attached_sata_dev;
 192         phy->attached_sata_ps   = dr->attached_sata_ps;
 193         phy->attached_iproto = dr->iproto << 1;
 194         phy->attached_tproto = dr->tproto << 1;
 195         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 196         phy->attached_phy_id = dr->attached_phy_id;
 197         phy->phy_change_count = dr->change_count;
 198         phy->routing_attr = dr->routing_attr;
 199         phy->virtual = dr->virtual;
 200         phy->last_da_index = -1;
 201
 202         phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
 203         phy->phy->identify.device_type = phy->attached_dev_type;
 204         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 205         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 206         phy->phy->identify.phy_identifier = phy_id;
 207         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 208         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 209         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 210         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 211         phy->phy->negotiated_linkrate = phy->linkrate;
 212
 213         if (!rediscover)
 214                 if (sas_phy_add(phy->phy)) {
 215                         sas_phy_free(phy->phy);
 216                         return;
 217                 }
 218
 219         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 220                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 221                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 222                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 223                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 224                     SAS_ADDR(phy->attached_sas_addr));
 225
 226         return;
 227 }
 228
 229 #define DISCOVER_REQ_SIZE  16
 230 #define DISCOVER_RESP_SIZE 56
 231
 232 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 233                                       u8 *disc_resp, int single)
 234 {
 235         int i, res;
 236
 237         disc_req[9] = single;
 238         for (i = 1 ; i < 3; i++) {
 239                 struct discover_resp *dr;
 240
 241                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 242                                        disc_resp, DISCOVER_RESP_SIZE);
 243                 if (res)
 244                         return res;
 245                 /* This is detecting a failure to transmit initial
 246                  * dev to host FIS as described in section G.5 of
 247                  * sas-2 r 04b */
 248                 dr = &((struct smp_resp *)disc_resp)->disc;
 249                 if (memcmp(dev->sas_addr, dr->attached_sas_addr,
 250                           SAS_ADDR_SIZE) == 0) {
 251                         sas_printk("Found loopback topology, just ignore it!\n");
 252                         return 0;
 253                 }
 254                 if (!(dr->attached_dev_type == 0 &&
 255                       dr->attached_sata_dev))
 256                         break;
 257                 /* In order to generate the dev to host FIS, we
 258                  * send a link reset to the expander port */
 259                 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
 260                 /* Wait for the reset to trigger the negotiation */
 261                 msleep(500);
 262         }
 263         sas_set_ex_phy(dev, single, disc_resp);
 264         return 0;
 265 }
 266
 267 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 268 {
 269         struct expander_device *ex = &dev->ex_dev;
 270         int  res = 0;
 271         u8   *disc_req;
 272         u8   *disc_resp;
 273
 274         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 275         if (!disc_req)
 276                 return -ENOMEM;
 277
 278         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 279         if (!disc_resp) {
 280                 kfree(disc_req);
 281                 return -ENOMEM;
 282         }
 283
 284         disc_req[1] = SMP_DISCOVER;
 285
 286         if (0 <= single && single < ex->num_phys) {
 287                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 288         } else {
 289                 int i;
 290
 291                 for (i = 0; i < ex->num_phys; i++) {
 292                         res = sas_ex_phy_discover_helper(dev, disc_req,
 293                                                          disc_resp, i);
 294                         if (res)
 295                                 goto out_err;
 296                 }
 297         }
 298 out_err:
 299         kfree(disc_resp);
 300         kfree(disc_req);
 301         return res;
 302 }
 303
 304 static int sas_expander_discover(struct domain_device *dev)
 305 {
 306         struct expander_device *ex = &dev->ex_dev;
 307         int res = -ENOMEM;
 308
 309         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 310         if (!ex->ex_phy)
 311                 return -ENOMEM;
 312
 313         res = sas_ex_phy_discover(dev, -1);
 314         if (res)
 315                 goto out_err;
 316
 317         return 0;
 318  out_err:
 319         kfree(ex->ex_phy);
 320         ex->ex_phy = NULL;
 321         return res;
 322 }
 323
 324 #define MAX_EXPANDER_PHYS 128
 325
 326 static void ex_assign_report_general(struct domain_device *dev,
 327                                             struct smp_resp *resp)
 328 {
 329         struct report_general_resp *rg = &resp->rg;
 330
 331         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 332         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 333         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 334         dev->ex_dev.t2t_supp = rg->t2t_supp;
 335         dev->ex_dev.conf_route_table = rg->conf_route_table;
 336         dev->ex_dev.configuring = rg->configuring;
 337         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 338 }
 339
 340 #define RG_REQ_SIZE   8
 341 #define RG_RESP_SIZE 32
 342
 343 static int sas_ex_general(struct domain_device *dev)
 344 {
 345         u8 *rg_req;
 346         struct smp_resp *rg_resp;
 347         int res;
 348         int i;
 349
 350         rg_req = alloc_smp_req(RG_REQ_SIZE);
 351         if (!rg_req)
 352                 return -ENOMEM;
 353
 354         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 355         if (!rg_resp) {
 356                 kfree(rg_req);
 357                 return -ENOMEM;
 358         }
 359
 360         rg_req[1] = SMP_REPORT_GENERAL;
 361
 362         for (i = 0; i < 5; i++) {
 363                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 364                                        RG_RESP_SIZE);
 365
 366                 if (res) {
 367                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 368                                     SAS_ADDR(dev->sas_addr), res);
 369                         goto out;
 370                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 371                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 372                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 373                         res = rg_resp->result;
 374                         goto out;
 375                 }
 376
 377                 ex_assign_report_general(dev, rg_resp);
 378
 379                 if (dev->ex_dev.configuring) {
 380                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 381                                     SAS_ADDR(dev->sas_addr));
 382                         schedule_timeout_interruptible(5*HZ);
 383                 } else
 384                         break;
 385         }
 386 out:
 387         kfree(rg_req);
 388         kfree(rg_resp);
 389         return res;
 390 }
 391
 392 static void ex_assign_manuf_info(struct domain_device *dev, void
 393                                         *_mi_resp)
 394 {
 395         u8 *mi_resp = _mi_resp;
 396         struct sas_rphy *rphy = dev->rphy;
 397         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 398
 399         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 400         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 401         memcpy(edev->product_rev, mi_resp + 36,
 402                SAS_EXPANDER_PRODUCT_REV_LEN);
 403
 404         if (mi_resp[8] & 1) {
 405                 memcpy(edev->component_vendor_id, mi_resp + 40,
 406                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 407                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 408                 edev->component_revision_id = mi_resp[50];
 409         }
 410 }
 411
 412 #define MI_REQ_SIZE   8
 413 #define MI_RESP_SIZE 64
 414
 415 static int sas_ex_manuf_info(struct domain_device *dev)
 416 {
 417         u8 *mi_req;
 418         u8 *mi_resp;
 419         int res;
 420
 421         mi_req = alloc_smp_req(MI_REQ_SIZE);
 422         if (!mi_req)
 423                 return -ENOMEM;
 424
 425         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 426         if (!mi_resp) {
 427                 kfree(mi_req);
 428                 return -ENOMEM;
 429         }
 430
 431         mi_req[1] = SMP_REPORT_MANUF_INFO;
 432
 433         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 434         if (res) {
 435                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 436                             SAS_ADDR(dev->sas_addr), res);
 437                 goto out;
 438         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 439                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 440                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 441                 goto out;
 442         }
 443
 444         ex_assign_manuf_info(dev, mi_resp);
 445 out:
 446         kfree(mi_req);
 447         kfree(mi_resp);
 448         return res;
 449 }
 450
 451 #define PC_REQ_SIZE  44
 452 #define PC_RESP_SIZE 8
 453
 454 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 455                         enum phy_func phy_func,
 456                         struct sas_phy_linkrates *rates)
 457 {
 458         u8 *pc_req;
 459         u8 *pc_resp;
 460         int res;
 461
 462         pc_req = alloc_smp_req(PC_REQ_SIZE);
 463         if (!pc_req)
 464                 return -ENOMEM;
 465
 466         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 467         if (!pc_resp) {
 468                 kfree(pc_req);
 469                 return -ENOMEM;
 470         }
 471
 472         pc_req[1] = SMP_PHY_CONTROL;
 473         pc_req[9] = phy_id;
 474         pc_req[10]= phy_func;
 475         if (rates) {
 476                 pc_req[32] = rates->minimum_linkrate << 4;
 477                 pc_req[33] = rates->maximum_linkrate << 4;
 478         }
 479
 480         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 481
 482         kfree(pc_resp);
 483         kfree(pc_req);
 484         return res;
 485 }
 486
 487 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 488 {
 489         struct expander_device *ex = &dev->ex_dev;
 490         struct ex_phy *phy = &ex->ex_phy[phy_id];
 491
 492         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 493         phy->linkrate = SAS_PHY_DISABLED;
 494 }
 495
 496 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 497 {
 498         struct expander_device *ex = &dev->ex_dev;
 499         int i;
 500
 501         for (i = 0; i < ex->num_phys; i++) {
 502                 struct ex_phy *phy = &ex->ex_phy[i];
 503
 504                 if (phy->phy_state == PHY_VACANT ||
 505                     phy->phy_state == PHY_NOT_PRESENT)
 506                         continue;
 507
 508                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 509                         sas_ex_disable_phy(dev, i);
 510         }
 511 }
 512
 513 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 514                                             u8 *sas_addr)
 515 {
 516         struct domain_device *dev;
 517
 518         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 519                 return 1;
 520         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 521                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 522                         return 1;
 523         }
 524         return 0;
 525 }
 526
 527 #define RPEL_REQ_SIZE   16
 528 #define RPEL_RESP_SIZE  32
 529 int sas_smp_get_phy_events(struct sas_phy *phy)
 530 {
 531         int res;
 532         u8 *req;
 533         u8 *resp;
 534         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 535         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 536
 537         req = alloc_smp_req(RPEL_REQ_SIZE);
 538         if (!req)
 539                 return -ENOMEM;
 540
 541         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 542         if (!resp) {
 543                 kfree(req);
 544                 return -ENOMEM;
 545         }
 546
 547         req[1] = SMP_REPORT_PHY_ERR_LOG;
 548         req[9] = phy->number;
 549
 550         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 551                                     resp, RPEL_RESP_SIZE);
 552
 553         if (!res)
 554                 goto out;
 555
 556         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 557         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 558         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 559         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 560
 561  out:
 562         kfree(resp);
 563         return res;
 564
 565 }
 566
 567 #ifdef CONFIG_SCSI_SAS_ATA
 568
 569 #define RPS_REQ_SIZE  16
 570 #define RPS_RESP_SIZE 60
 571
 572 static int sas_get_report_phy_sata(struct domain_device *dev,
 573                                           int phy_id,
 574                                           struct smp_resp *rps_resp)
 575 {
 576         int res;
 577         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 578         u8 *resp = (u8 *)rps_resp;
 579
 580         if (!rps_req)
 581                 return -ENOMEM;
 582
 583         rps_req[1] = SMP_REPORT_PHY_SATA;
 584         rps_req[9] = phy_id;
 585
 586         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 587                                     rps_resp, RPS_RESP_SIZE);
 588
 589         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 590          * standards cockup here.  sas-2 explicitly specifies the FIS
 591          * should be encoded so that FIS type is in resp[24].
 592          * However, some expanders endian reverse this.  Undo the
 593          * reversal here */
 594         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 595                 int i;
 596
 597                 for (i = 0; i < 5; i++) {
 598                         int j = 24 + (i*4);
 599                         u8 a, b;
 600                         a = resp[j + 0];
 601                         b = resp[j + 1];
 602                         resp[j + 0] = resp[j + 3];
 603                         resp[j + 1] = resp[j + 2];
 604                         resp[j + 2] = b;
 605                         resp[j + 3] = a;
 606                 }
 607         }
 608
 609         kfree(rps_req);
 610         return res;
 611 }
 612 #endif
 613
 614 static void sas_ex_get_linkrate(struct domain_device *parent,
 615                                        struct domain_device *child,
 616                                        struct ex_phy *parent_phy)
 617 {
 618         struct expander_device *parent_ex = &parent->ex_dev;
 619         struct sas_port *port;
 620         int i;
 621
 622         child->pathways = 0;
 623
 624         port = parent_phy->port;
 625
 626         for (i = 0; i < parent_ex->num_phys; i++) {
 627                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 628
 629                 if (phy->phy_state == PHY_VACANT ||
 630                     phy->phy_state == PHY_NOT_PRESENT)
 631                         continue;
 632
 633                 if (SAS_ADDR(phy->attached_sas_addr) ==
 634                     SAS_ADDR(child->sas_addr)) {
 635
 636                         child->min_linkrate = min(parent->min_linkrate,
 637                                                   phy->linkrate);
 638                         child->max_linkrate = max(parent->max_linkrate,
 639                                                   phy->linkrate);
 640                         child->pathways++;
 641                         sas_port_add_phy(port, phy->phy);
 642                 }
 643         }
 644         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 645         child->pathways = min(child->pathways, parent->pathways);
 646 }
 647
 648 static struct domain_device *sas_ex_discover_end_dev(
 649         struct domain_device *parent, int phy_id)
 650 {
 651         struct expander_device *parent_ex = &parent->ex_dev;
 652         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 653         struct domain_device *child = NULL;
 654         struct sas_rphy *rphy;
 655         int res;
 656
 657         if (phy->attached_sata_host || phy->attached_sata_ps)
 658                 return NULL;
 659
 660         child = kzalloc(sizeof(*child), GFP_KERNEL);
 661         if (!child)
 662                 return NULL;
 663
 664         child->parent = parent;
 665         child->port   = parent->port;
 666         child->iproto = phy->attached_iproto;
 667         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 668         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 669         if (!phy->port) {
 670                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 671                 if (unlikely(!phy->port))
 672                         goto out_err;
 673                 if (unlikely(sas_port_add(phy->port) != 0)) {
 674                         sas_port_free(phy->port);
 675                         goto out_err;
 676                 }
 677         }
 678         sas_ex_get_linkrate(parent, child, phy);
 679
 680 #ifdef CONFIG_SCSI_SAS_ATA
 681         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 682                 child->dev_type = SATA_DEV;
 683                 if (phy->attached_tproto & SAS_PROTOCOL_STP)
 684                         child->tproto = phy->attached_tproto;
 685                 if (phy->attached_sata_dev)
 686                         child->tproto |= SATA_DEV;
 687                 res = sas_get_report_phy_sata(parent, phy_id,
 688                                               &child->sata_dev.rps_resp);
 689                 if (res) {
 690                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 691                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 692                                     phy_id, res);
 693                         goto out_free;
 694                 }
 695                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 696                        sizeof(struct dev_to_host_fis));
 697
 698                 rphy = sas_end_device_alloc(phy->port);
 699                 if (unlikely(!rphy))
 700                         goto out_free;
 701
 702                 sas_init_dev(child);
 703
 704                 child->rphy = rphy;
 705
 706                 spin_lock_irq(&parent->port->dev_list_lock);
 707                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 708                 spin_unlock_irq(&parent->port->dev_list_lock);
 709
 710                 res = sas_discover_sata(child);
 711                 if (res) {
 712                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 713                                     "%016llx:0x%x returned 0x%x\n",
 714                                     SAS_ADDR(child->sas_addr),
 715                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 716                         goto out_list_del;
 717                 }
 718         } else
 719 #endif
 720           if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 721                 child->dev_type = SAS_END_DEV;
 722                 rphy = sas_end_device_alloc(phy->port);
 723                 /* FIXME: error handling */
 724                 if (unlikely(!rphy))
 725                         goto out_free;
 726                 child->tproto = phy->attached_tproto;
 727                 sas_init_dev(child);
 728
 729                 child->rphy = rphy;
 730                 sas_fill_in_rphy(child, rphy);
 731
 732                 spin_lock_irq(&parent->port->dev_list_lock);
 733                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 734                 spin_unlock_irq(&parent->port->dev_list_lock);
 735
 736                 res = sas_discover_end_dev(child);
 737                 if (res) {
 738                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 739                                     "at %016llx:0x%x returned 0x%x\n",
 740                                     SAS_ADDR(child->sas_addr),
 741                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 742                         goto out_list_del;
 743                 }
 744         } else {
 745                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 746                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 747                             phy_id);
 748                 goto out_free;
 749         }
 750
 751         list_add_tail(&child->siblings, &parent_ex->children);
 752         return child;
 753
 754  out_list_del:
 755         sas_rphy_free(child->rphy);
 756         child->rphy = NULL;
 757
 758         spin_lock_irq(&parent->port->dev_list_lock);
 759         list_del(&child->dev_list_node);
 760         spin_unlock_irq(&parent->port->dev_list_lock);
 761  out_free:
 762         sas_port_delete(phy->port);
 763  out_err:
 764         phy->port = NULL;
 765         kfree(child);
 766         return NULL;
 767 }
 768
 769 /* See if this phy is part of a wide port */
 770 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 771 {
 772         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 773         int i;
 774
 775         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 776                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 777
 778                 if (ephy == phy)
 779                         continue;
 780
 781                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 782                             SAS_ADDR_SIZE) && ephy->port) {
 783                         sas_port_add_phy(ephy->port, phy->phy);
 784                         phy->port = ephy->port;
 785                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 786                         return 0;
 787                 }
 788         }
 789
 790         return -ENODEV;
 791 }
 792
 793 static struct domain_device *sas_ex_discover_expander(
 794         struct domain_device *parent, int phy_id)
 795 {
 796         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 797         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 798         struct domain_device *child = NULL;
 799         struct sas_rphy *rphy;
 800         struct sas_expander_device *edev;
 801         struct asd_sas_port *port;
 802         int res;
 803
 804         if (phy->routing_attr == DIRECT_ROUTING) {
 805                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 806                             "allowed\n",
 807                             SAS_ADDR(parent->sas_addr), phy_id,
 808                             SAS_ADDR(phy->attached_sas_addr),
 809                             phy->attached_phy_id);
 810                 return NULL;
 811         }
 812         child = kzalloc(sizeof(*child), GFP_KERNEL);
 813         if (!child)
 814                 return NULL;
 815
 816         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 817         /* FIXME: better error handling */
 818         BUG_ON(sas_port_add(phy->port) != 0);
 819
 820
 821         switch (phy->attached_dev_type) {
 822         case EDGE_DEV:
 823                 rphy = sas_expander_alloc(phy->port,
 824                                           SAS_EDGE_EXPANDER_DEVICE);
 825                 break;
 826         case FANOUT_DEV:
 827                 rphy = sas_expander_alloc(phy->port,
 828                                           SAS_FANOUT_EXPANDER_DEVICE);
 829                 break;
 830         default:
 831                 rphy = NULL;    /* shut gcc up */
 832                 BUG();
 833         }
 834         port = parent->port;
 835         child->rphy = rphy;
 836         edev = rphy_to_expander_device(rphy);
 837         child->dev_type = phy->attached_dev_type;
 838         child->parent = parent;
 839         child->port = port;
 840         child->iproto = phy->attached_iproto;
 841         child->tproto = phy->attached_tproto;
 842         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 843         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 844         sas_ex_get_linkrate(parent, child, phy);
 845         edev->level = parent_ex->level + 1;
 846         parent->port->disc.max_level = max(parent->port->disc.max_level,
 847                                            edev->level);
 848         sas_init_dev(child);
 849         sas_fill_in_rphy(child, rphy);
 850         sas_rphy_add(rphy);
 851
 852         spin_lock_irq(&parent->port->dev_list_lock);
 853         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 854         spin_unlock_irq(&parent->port->dev_list_lock);
 855
 856         res = sas_discover_expander(child);
 857         if (res) {
 858                 spin_lock_irq(&parent->port->dev_list_lock);
 859                 list_del(&child->dev_list_node);
 860                 spin_unlock_irq(&parent->port->dev_list_lock);
 861                 kfree(child);
 862                 return NULL;
 863         }
 864         list_add_tail(&child->siblings, &parent->ex_dev.children);
 865         return child;
 866 }
 867
 868 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 869 {
 870         struct expander_device *ex = &dev->ex_dev;
 871         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 872         struct domain_device *child = NULL;
 873         int res = 0;
 874
 875         /* Phy state */
 876         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 877                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 878                         res = sas_ex_phy_discover(dev, phy_id);
 879                 if (res)
 880                         return res;
 881         }
 882
 883         /* Parent and domain coherency */
 884         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 885                              SAS_ADDR(dev->port->sas_addr))) {
 886                 sas_add_parent_port(dev, phy_id);
 887                 return 0;
 888         }
 889         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 890                             SAS_ADDR(dev->parent->sas_addr))) {
 891                 sas_add_parent_port(dev, phy_id);
 892                 if (ex_phy->routing_attr == TABLE_ROUTING)
 893                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 894                 return 0;
 895         }
 896
 897         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 898                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 899
 900         if (ex_phy->attached_dev_type == NO_DEVICE) {
 901                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 902                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 903                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 904                 }
 905                 return 0;
 906         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 907                 return 0;
 908
 909         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 910             ex_phy->attached_dev_type != FANOUT_DEV &&
 911             ex_phy->attached_dev_type != EDGE_DEV) {
 912                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 913                             "phy 0x%x\n", ex_phy->attached_dev_type,
 914                             SAS_ADDR(dev->sas_addr),
 915                             phy_id);
 916                 return 0;
 917         }
 918
 919         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 920         if (res) {
 921                 SAS_DPRINTK("configure routing for dev %016llx "
 922                             "reported 0x%x. Forgotten\n",
 923                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 924                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 925                 return res;
 926         }
 927
 928         res = sas_ex_join_wide_port(dev, phy_id);
 929         if (!res) {
 930                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 931                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 932                 return res;
 933         }
 934
 935         switch (ex_phy->attached_dev_type) {
 936         case SAS_END_DEV:
 937                 child = sas_ex_discover_end_dev(dev, phy_id);
 938                 break;
 939         case FANOUT_DEV:
 940                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 941                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 942                                     "attached to ex %016llx phy 0x%x\n",
 943                                     SAS_ADDR(ex_phy->attached_sas_addr),
 944                                     ex_phy->attached_phy_id,
 945                                     SAS_ADDR(dev->sas_addr),
 946                                     phy_id);
 947                         sas_ex_disable_phy(dev, phy_id);
 948                         break;
 949                 } else
 950                         memcpy(dev->port->disc.fanout_sas_addr,
 951                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 952                 /* fallthrough */
 953         case EDGE_DEV:
 954                 child = sas_ex_discover_expander(dev, phy_id);
 955                 break;
 956         default:
 957                 break;
 958         }
 959
 960         if (child) {
 961                 int i;
 962
 963                 for (i = 0; i < ex->num_phys; i++) {
 964                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 965                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 966                                 continue;
 967                         /*
 968                          * Due to races, the phy might not get added to the
 969                          * wide port, so we add the phy to the wide port here.
 970                          */
 971                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 972                             SAS_ADDR(child->sas_addr)) {
 973                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 974                                 res = sas_ex_join_wide_port(dev, i);
 975                                 if (!res)
 976                                         SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 977                                                     i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
 978
 979                         }
 980                 }
 981         }
 982
 983         return res;
 984 }
 985
 986 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 987 {
 988         struct expander_device *ex = &dev->ex_dev;
 989         int i;
 990
 991         for (i = 0; i < ex->num_phys; i++) {
 992                 struct ex_phy *phy = &ex->ex_phy[i];
 993
 994                 if (phy->phy_state == PHY_VACANT ||
 995                     phy->phy_state == PHY_NOT_PRESENT)
 996                         continue;
 997
 998                 if ((phy->attached_dev_type == EDGE_DEV ||
 999                      phy->attached_dev_type == FANOUT_DEV) &&
1000                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1001
1002                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1003
1004                         return 1;
1005                 }
1006         }
1007         return 0;
1008 }
1009
1010 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1011 {
1012         struct expander_device *ex = &dev->ex_dev;
1013         struct domain_device *child;
1014         u8 sub_addr[8] = {0, };
1015
1016         list_for_each_entry(child, &ex->children, siblings) {
1017                 if (child->dev_type != EDGE_DEV &&
1018                     child->dev_type != FANOUT_DEV)
1019                         continue;
1020                 if (sub_addr[0] == 0) {
1021                         sas_find_sub_addr(child, sub_addr);
1022                         continue;
1023                 } else {
1024                         u8 s2[8];
1025
1026                         if (sas_find_sub_addr(child, s2) &&
1027                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1028
1029                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1030                                             "diverges from subtractive "
1031                                             "boundary %016llx\n",
1032                                             SAS_ADDR(dev->sas_addr),
1033                                             SAS_ADDR(child->sas_addr),
1034                                             SAS_ADDR(s2),
1035                                             SAS_ADDR(sub_addr));
1036
1037                                 sas_ex_disable_port(child, s2);
1038                         }
1039                 }
1040         }
1041         return 0;
1042 }
1043 /**
1044  * sas_ex_discover_devices -- discover devices attached to this expander
1045  * dev: pointer to the expander domain device
1046  * single: if you want to do a single phy, else set to -1;
1047  *
1048  * Configure this expander for use with its devices and register the
1049  * devices of this expander.
1050  */
1051 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1052 {
1053         struct expander_device *ex = &dev->ex_dev;
1054         int i = 0, end = ex->num_phys;
1055         int res = 0;
1056
1057         if (0 <= single && single < end) {
1058                 i = single;
1059                 end = i+1;
1060         }
1061
1062         for ( ; i < end; i++) {
1063                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1064
1065                 if (ex_phy->phy_state == PHY_VACANT ||
1066                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1067                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1068                         continue;
1069
1070                 switch (ex_phy->linkrate) {
1071                 case SAS_PHY_DISABLED:
1072                 case SAS_PHY_RESET_PROBLEM:
1073                 case SAS_SATA_PORT_SELECTOR:
1074                         continue;
1075                 default:
1076                         res = sas_ex_discover_dev(dev, i);
1077                         if (res)
1078                                 break;
1079                         continue;
1080                 }
1081         }
1082
1083         if (!res)
1084                 sas_check_level_subtractive_boundary(dev);
1085
1086         return res;
1087 }
1088
1089 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1090 {
1091         struct expander_device *ex = &dev->ex_dev;
1092         int i;
1093         u8  *sub_sas_addr = NULL;
1094
1095         if (dev->dev_type != EDGE_DEV)
1096                 return 0;
1097
1098         for (i = 0; i < ex->num_phys; i++) {
1099                 struct ex_phy *phy = &ex->ex_phy[i];
1100
1101                 if (phy->phy_state == PHY_VACANT ||
1102                     phy->phy_state == PHY_NOT_PRESENT)
1103                         continue;
1104
1105                 if ((phy->attached_dev_type == FANOUT_DEV ||
1106                      phy->attached_dev_type == EDGE_DEV) &&
1107                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1108
1109                         if (!sub_sas_addr)
1110                                 sub_sas_addr = &phy->attached_sas_addr[0];
1111                         else if (SAS_ADDR(sub_sas_addr) !=
1112                                  SAS_ADDR(phy->attached_sas_addr)) {
1113
1114                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1115                                             "diverges(%016llx) on subtractive "
1116                                             "boundary(%016llx). Disabled\n",
1117                                             SAS_ADDR(dev->sas_addr), i,
1118                                             SAS_ADDR(phy->attached_sas_addr),
1119                                             SAS_ADDR(sub_sas_addr));
1120                                 sas_ex_disable_phy(dev, i);
1121                         }
1122                 }
1123         }
1124         return 0;
1125 }
1126
1127 static void sas_print_parent_topology_bug(struct domain_device *child,
1128                                                  struct ex_phy *parent_phy,
1129                                                  struct ex_phy *child_phy)
1130 {
1131         static const char ra_char[] = {
1132                 [DIRECT_ROUTING] = 'D',
1133                 [SUBTRACTIVE_ROUTING] = 'S',
1134                 [TABLE_ROUTING] = 'T',
1135         };
1136         static const char *ex_type[] = {
1137                 [EDGE_DEV] = "edge",
1138                 [FANOUT_DEV] = "fanout",
1139         };
1140         struct domain_device *parent = child->parent;
1141
1142         sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
1143                    "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
1144
1145                    ex_type[parent->dev_type],
1146                    SAS_ADDR(parent->sas_addr),
1147                    parent->ex_dev.t2t_supp,
1148                    parent_phy->phy_id,
1149
1150                    ex_type[child->dev_type],
1151                    SAS_ADDR(child->sas_addr),
1152                    child->ex_dev.t2t_supp,
1153                    child_phy->phy_id,
1154
1155                    ra_char[parent_phy->routing_attr],
1156                    ra_char[child_phy->routing_attr]);
1157 }
1158
1159 static int sas_check_eeds(struct domain_device *child,
1160                                  struct ex_phy *parent_phy,
1161                                  struct ex_phy *child_phy)
1162 {
1163         int res = 0;
1164         struct domain_device *parent = child->parent;
1165
1166         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1167                 res = -ENODEV;
1168                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1169                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1170                             SAS_ADDR(parent->sas_addr),
1171                             parent_phy->phy_id,
1172                             SAS_ADDR(child->sas_addr),
1173                             child_phy->phy_id,
1174                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1175         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1176                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1177                        SAS_ADDR_SIZE);
1178                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1179                        SAS_ADDR_SIZE);
1180         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1181                     SAS_ADDR(parent->sas_addr)) ||
1182                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1183                     SAS_ADDR(child->sas_addr)))
1184                    &&
1185                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1186                      SAS_ADDR(parent->sas_addr)) ||
1187                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1188                      SAS_ADDR(child->sas_addr))))
1189                 ;
1190         else {
1191                 res = -ENODEV;
1192                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1193                             "phy 0x%x link forms a third EEDS!\n",
1194                             SAS_ADDR(parent->sas_addr),
1195                             parent_phy->phy_id,
1196                             SAS_ADDR(child->sas_addr),
1197                             child_phy->phy_id);
1198         }
1199
1200         return res;
1201 }
1202
1203 /* Here we spill over 80 columns.  It is intentional.
1204  */
1205 static int sas_check_parent_topology(struct domain_device *child)
1206 {
1207         struct expander_device *child_ex = &child->ex_dev;
1208         struct expander_device *parent_ex;
1209         int i;
1210         int res = 0;
1211
1212         if (!child->parent)
1213                 return 0;
1214
1215         if (child->parent->dev_type != EDGE_DEV &&
1216             child->parent->dev_type != FANOUT_DEV)
1217                 return 0;
1218
1219         parent_ex = &child->parent->ex_dev;
1220
1221         for (i = 0; i < parent_ex->num_phys; i++) {
1222                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1223                 struct ex_phy *child_phy;
1224
1225                 if (parent_phy->phy_state == PHY_VACANT ||
1226                     parent_phy->phy_state == PHY_NOT_PRESENT)
1227                         continue;
1228
1229                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1230                         continue;
1231
1232                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1233
1234                 switch (child->parent->dev_type) {
1235                 case EDGE_DEV:
1236                         if (child->dev_type == FANOUT_DEV) {
1237                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1238                                     child_phy->routing_attr != TABLE_ROUTING) {
1239                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1240                                         res = -ENODEV;
1241                                 }
1242                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1243                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1244                                         res = sas_check_eeds(child, parent_phy, child_phy);
1245                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1246                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1247                                         res = -ENODEV;
1248                                 }
1249                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1250                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1251                                     (child_phy->routing_attr == TABLE_ROUTING &&
1252                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1253                                         /* All good */;
1254                                 } else {
1255                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1256                                         res = -ENODEV;
1257                                 }
1258                         }
1259                         break;
1260                 case FANOUT_DEV:
1261                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1262                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1263                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1264                                 res = -ENODEV;
1265                         }
1266                         break;
1267                 default:
1268                         break;
1269                 }
1270         }
1271
1272         return res;
1273 }
1274
1275 #define RRI_REQ_SIZE  16
1276 #define RRI_RESP_SIZE 44
1277
1278 static int sas_configure_present(struct domain_device *dev, int phy_id,
1279                                  u8 *sas_addr, int *index, int *present)
1280 {
1281         int i, res = 0;
1282         struct expander_device *ex = &dev->ex_dev;
1283         struct ex_phy *phy = &ex->ex_phy[phy_id];
1284         u8 *rri_req;
1285         u8 *rri_resp;
1286
1287         *present = 0;
1288         *index = 0;
1289
1290         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1291         if (!rri_req)
1292                 return -ENOMEM;
1293
1294         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1295         if (!rri_resp) {
1296                 kfree(rri_req);
1297                 return -ENOMEM;
1298         }
1299
1300         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1301         rri_req[9] = phy_id;
1302
1303         for (i = 0; i < ex->max_route_indexes ; i++) {
1304                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1305                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1306                                        RRI_RESP_SIZE);
1307                 if (res)
1308                         goto out;
1309                 res = rri_resp[2];
1310                 if (res == SMP_RESP_NO_INDEX) {
1311                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1312                                     "phy 0x%x index 0x%x\n",
1313                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1314                         goto out;
1315                 } else if (res != SMP_RESP_FUNC_ACC) {
1316                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1317                                     "result 0x%x\n", __func__,
1318                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1319                         goto out;
1320                 }
1321                 if (SAS_ADDR(sas_addr) != 0) {
1322                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1323                                 *index = i;
1324                                 if ((rri_resp[12] & 0x80) == 0x80)
1325                                         *present = 0;
1326                                 else
1327                                         *present = 1;
1328                                 goto out;
1329                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1330                                 *index = i;
1331                                 *present = 0;
1332                                 goto out;
1333                         }
1334                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1335                            phy->last_da_index < i) {
1336                         phy->last_da_index = i;
1337                         *index = i;
1338                         *present = 0;
1339                         goto out;
1340                 }
1341         }
1342         res = -1;
1343 out:
1344         kfree(rri_req);
1345         kfree(rri_resp);
1346         return res;
1347 }
1348
1349 #define CRI_REQ_SIZE  44
1350 #define CRI_RESP_SIZE  8
1351
1352 static int sas_configure_set(struct domain_device *dev, int phy_id,
1353                              u8 *sas_addr, int index, int include)
1354 {
1355         int res;
1356         u8 *cri_req;
1357         u8 *cri_resp;
1358
1359         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1360         if (!cri_req)
1361                 return -ENOMEM;
1362
1363         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1364         if (!cri_resp) {
1365                 kfree(cri_req);
1366                 return -ENOMEM;
1367         }
1368
1369         cri_req[1] = SMP_CONF_ROUTE_INFO;
1370         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1371         cri_req[9] = phy_id;
1372         if (SAS_ADDR(sas_addr) == 0 || !include)
1373                 cri_req[12] |= 0x80;
1374         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1375
1376         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1377                                CRI_RESP_SIZE);
1378         if (res)
1379                 goto out;
1380         res = cri_resp[2];
1381         if (res == SMP_RESP_NO_INDEX) {
1382                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1383                             "index 0x%x\n",
1384                             SAS_ADDR(dev->sas_addr), phy_id, index);
1385         }
1386 out:
1387         kfree(cri_req);
1388         kfree(cri_resp);
1389         return res;
1390 }
1391
1392 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1393                                     u8 *sas_addr, int include)
1394 {
1395         int index;
1396         int present;
1397         int res;
1398
1399         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1400         if (res)
1401                 return res;
1402         if (include ^ present)
1403                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1404
1405         return res;
1406 }
1407
1408 /**
1409  * sas_configure_parent -- configure routing table of parent
1410  * parent: parent expander
1411  * child: child expander
1412  * sas_addr: SAS port identifier of device directly attached to child
1413  */
1414 static int sas_configure_parent(struct domain_device *parent,
1415                                 struct domain_device *child,
1416                                 u8 *sas_addr, int include)
1417 {
1418         struct expander_device *ex_parent = &parent->ex_dev;
1419         int res = 0;
1420         int i;
1421
1422         if (parent->parent) {
1423                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1424                                            include);
1425                 if (res)
1426                         return res;
1427         }
1428
1429         if (ex_parent->conf_route_table == 0) {
1430                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1431                             SAS_ADDR(parent->sas_addr));
1432                 return 0;
1433         }
1434
1435         for (i = 0; i < ex_parent->num_phys; i++) {
1436                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1437
1438                 if ((phy->routing_attr == TABLE_ROUTING) &&
1439                     (SAS_ADDR(phy->attached_sas_addr) ==
1440                      SAS_ADDR(child->sas_addr))) {
1441                         res = sas_configure_phy(parent, i, sas_addr, include);
1442                         if (res)
1443                                 return res;
1444                 }
1445         }
1446
1447         return res;
1448 }
1449
1450 /**
1451  * sas_configure_routing -- configure routing
1452  * dev: expander device
1453  * sas_addr: port identifier of device directly attached to the expander device
1454  */
1455 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1456 {
1457         if (dev->parent)
1458                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1459         return 0;
1460 }
1461
1462 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1463 {
1464         if (dev->parent)
1465                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1466         return 0;
1467 }
1468
1469 /**
1470  * sas_discover_expander -- expander discovery
1471  * @ex: pointer to expander domain device
1472  *
1473  * See comment in sas_discover_sata().
1474  */
1475 static int sas_discover_expander(struct domain_device *dev)
1476 {
1477         int res;
1478
1479         res = sas_notify_lldd_dev_found(dev);
1480         if (res)
1481                 return res;
1482
1483         res = sas_ex_general(dev);
1484         if (res)
1485                 goto out_err;
1486         res = sas_ex_manuf_info(dev);
1487         if (res)
1488                 goto out_err;
1489
1490         res = sas_expander_discover(dev);
1491         if (res) {
1492                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1493                             SAS_ADDR(dev->sas_addr), res);
1494                 goto out_err;
1495         }
1496
1497         sas_check_ex_subtractive_boundary(dev);
1498         res = sas_check_parent_topology(dev);
1499         if (res)
1500                 goto out_err;
1501         return 0;
1502 out_err:
1503         sas_notify_lldd_dev_gone(dev);
1504         return res;
1505 }
1506
1507 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1508 {
1509         int res = 0;
1510         struct domain_device *dev;
1511
1512         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1513                 if (dev->dev_type == EDGE_DEV ||
1514                     dev->dev_type == FANOUT_DEV) {
1515                         struct sas_expander_device *ex =
1516                                 rphy_to_expander_device(dev->rphy);
1517
1518                         if (level == ex->level)
1519                                 res = sas_ex_discover_devices(dev, -1);
1520                         else if (level > 0)
1521                                 res = sas_ex_discover_devices(port->port_dev, -1);
1522
1523                 }
1524         }
1525
1526         return res;
1527 }
1528
1529 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1530 {
1531         int res;
1532         int level;
1533
1534         do {
1535                 level = port->disc.max_level;
1536                 res = sas_ex_level_discovery(port, level);
1537                 mb();
1538         } while (level < port->disc.max_level);
1539
1540         return res;
1541 }
1542
1543 int sas_discover_root_expander(struct domain_device *dev)
1544 {
1545         int res;
1546         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1547
1548         res = sas_rphy_add(dev->rphy);
1549         if (res)
1550                 goto out_err;
1551
1552         ex->level = dev->port->disc.max_level; /* 0 */
1553         res = sas_discover_expander(dev);
1554         if (res)
1555                 goto out_err2;
1556
1557         sas_ex_bfs_disc(dev->port);
1558
1559         return res;
1560
1561 out_err2:
1562         sas_rphy_remove(dev->rphy);
1563 out_err:
1564         return res;
1565 }
1566
1567 /* ---------- Domain revalidation ---------- */
1568
1569 static int sas_get_phy_discover(struct domain_device *dev,
1570                                 int phy_id, struct smp_resp *disc_resp)
1571 {
1572         int res;
1573         u8 *disc_req;
1574
1575         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1576         if (!disc_req)
1577                 return -ENOMEM;
1578
1579         disc_req[1] = SMP_DISCOVER;
1580         disc_req[9] = phy_id;
1581
1582         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1583                                disc_resp, DISCOVER_RESP_SIZE);
1584         if (res)
1585                 goto out;
1586         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1587                 res = disc_resp->result;
1588                 goto out;
1589         }
1590 out:
1591         kfree(disc_req);
1592         return res;
1593 }
1594
1595 static int sas_get_phy_change_count(struct domain_device *dev,
1596                                     int phy_id, int *pcc)
1597 {
1598         int res;
1599         struct smp_resp *disc_resp;
1600
1601         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1602         if (!disc_resp)
1603                 return -ENOMEM;
1604
1605         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1606         if (!res)
1607                 *pcc = disc_resp->disc.change_count;
1608
1609         kfree(disc_resp);
1610         return res;
1611 }
1612
1613 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1614                                          int phy_id, u8 *attached_sas_addr)
1615 {
1616         int res;
1617         struct smp_resp *disc_resp;
1618         struct discover_resp *dr;
1619
1620         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1621         if (!disc_resp)
1622                 return -ENOMEM;
1623         dr = &disc_resp->disc;
1624
1625         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1626         if (!res) {
1627                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1628                 if (dr->attached_dev_type == 0)
1629                         memset(attached_sas_addr, 0, 8);
1630         }
1631         kfree(disc_resp);
1632         return res;
1633 }
1634
1635 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1636                               int from_phy, bool update)
1637 {
1638         struct expander_device *ex = &dev->ex_dev;
1639         int res = 0;
1640         int i;
1641
1642         for (i = from_phy; i < ex->num_phys; i++) {
1643                 int phy_change_count = 0;
1644
1645                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1646                 if (res)
1647                         goto out;
1648                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1649                         if (update)
1650                                 ex->ex_phy[i].phy_change_count =
1651                                         phy_change_count;
1652                         *phy_id = i;
1653                         return 0;
1654                 }
1655         }
1656 out:
1657         return res;
1658 }
1659
1660 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1661 {
1662         int res;
1663         u8  *rg_req;
1664         struct smp_resp  *rg_resp;
1665
1666         rg_req = alloc_smp_req(RG_REQ_SIZE);
1667         if (!rg_req)
1668                 return -ENOMEM;
1669
1670         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1671         if (!rg_resp) {
1672                 kfree(rg_req);
1673                 return -ENOMEM;
1674         }
1675
1676         rg_req[1] = SMP_REPORT_GENERAL;
1677
1678         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1679                                RG_RESP_SIZE);
1680         if (res)
1681                 goto out;
1682         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1683                 res = rg_resp->result;
1684                 goto out;
1685         }
1686
1687         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1688 out:
1689         kfree(rg_resp);
1690         kfree(rg_req);
1691         return res;
1692 }
1693 /**
1694  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1695  * @dev:domain device to be detect.
1696  * @src_dev: the device which originated BROADCAST(CHANGE).
1697  *
1698  * Add self-configuration expander suport. Suppose two expander cascading,
1699  * when the first level expander is self-configuring, hotplug the disks in
1700  * second level expander, BROADCAST(CHANGE) will not only be originated
1701  * in the second level expander, but also be originated in the first level
1702  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1703  * expander changed count in two level expanders will all increment at least
1704  * once, but the phy which chang count has changed is the source device which
1705  * we concerned.
1706  */
1707
1708 static int sas_find_bcast_dev(struct domain_device *dev,
1709                               struct domain_device **src_dev)
1710 {
1711         struct expander_device *ex = &dev->ex_dev;
1712         int ex_change_count = -1;
1713         int phy_id = -1;
1714         int res;
1715         struct domain_device *ch;
1716
1717         res = sas_get_ex_change_count(dev, &ex_change_count);
1718         if (res)
1719                 goto out;
1720         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1721                 /* Just detect if this expander phys phy change count changed,
1722                 * in order to determine if this expander originate BROADCAST,
1723                 * and do not update phy change count field in our structure.
1724                 */
1725                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1726                 if (phy_id != -1) {
1727                         *src_dev = dev;
1728                         ex->ex_change_count = ex_change_count;
1729                         SAS_DPRINTK("Expander phy change count has changed\n");
1730                         return res;
1731                 } else
1732                         SAS_DPRINTK("Expander phys DID NOT change\n");
1733         }
1734         list_for_each_entry(ch, &ex->children, siblings) {
1735                 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1736                         res = sas_find_bcast_dev(ch, src_dev);
1737                         if (*src_dev)
1738                                 return res;
1739                 }
1740         }
1741 out:
1742         return res;
1743 }
1744
1745 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1746 {
1747         struct expander_device *ex = &dev->ex_dev;
1748         struct domain_device *child, *n;
1749
1750         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1751                 child->gone = 1;
1752                 if (child->dev_type == EDGE_DEV ||
1753                     child->dev_type == FANOUT_DEV)
1754                         sas_unregister_ex_tree(port, child);
1755                 else
1756                         sas_unregister_dev(port, child);
1757         }
1758         sas_unregister_dev(port, dev);
1759 }
1760
1761 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1762                                          int phy_id, bool last)
1763 {
1764         struct expander_device *ex_dev = &parent->ex_dev;
1765         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1766         struct domain_device *child, *n;
1767         if (last) {
1768                 list_for_each_entry_safe(child, n,
1769                         &ex_dev->children, siblings) {
1770                         if (SAS_ADDR(child->sas_addr) ==
1771                             SAS_ADDR(phy->attached_sas_addr)) {
1772                                 child->gone = 1;
1773                                 if (child->dev_type == EDGE_DEV ||
1774                                     child->dev_type == FANOUT_DEV)
1775                                         sas_unregister_ex_tree(parent->port, child);
1776                                 else
1777                                         sas_unregister_dev(parent->port, child);
1778                                 break;
1779                         }
1780                 }
1781                 parent->gone = 1;
1782                 sas_disable_routing(parent, phy->attached_sas_addr);
1783         }
1784         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1785         if (phy->port) {
1786                 sas_port_delete_phy(phy->port, phy->phy);
1787                 if (phy->port->num_phys == 0)
1788                         sas_port_delete(phy->port);
1789                 phy->port = NULL;
1790         }
1791 }
1792
1793 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1794                                           const int level)
1795 {
1796         struct expander_device *ex_root = &root->ex_dev;
1797         struct domain_device *child;
1798         int res = 0;
1799
1800         list_for_each_entry(child, &ex_root->children, siblings) {
1801                 if (child->dev_type == EDGE_DEV ||
1802                     child->dev_type == FANOUT_DEV) {
1803                         struct sas_expander_device *ex =
1804                                 rphy_to_expander_device(child->rphy);
1805
1806                         if (level > ex->level)
1807                                 res = sas_discover_bfs_by_root_level(child,
1808                                                                      level);
1809                         else if (level == ex->level)
1810                                 res = sas_ex_discover_devices(child, -1);
1811                 }
1812         }
1813         return res;
1814 }
1815
1816 static int sas_discover_bfs_by_root(struct domain_device *dev)
1817 {
1818         int res;
1819         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1820         int level = ex->level+1;
1821
1822         res = sas_ex_discover_devices(dev, -1);
1823         if (res)
1824                 goto out;
1825         do {
1826                 res = sas_discover_bfs_by_root_level(dev, level);
1827                 mb();
1828                 level += 1;
1829         } while (level <= dev->port->disc.max_level);
1830 out:
1831         return res;
1832 }
1833
1834 static int sas_discover_new(struct domain_device *dev, int phy_id)
1835 {
1836         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1837         struct domain_device *child;
1838         bool found = false;
1839         int res, i;
1840
1841         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1842                     SAS_ADDR(dev->sas_addr), phy_id);
1843         res = sas_ex_phy_discover(dev, phy_id);
1844         if (res)
1845                 goto out;
1846         /* to support the wide port inserted */
1847         for (i = 0; i < dev->ex_dev.num_phys; i++) {
1848                 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i];
1849                 if (i == phy_id)
1850                         continue;
1851                 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) ==
1852                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1853                         found = true;
1854                         break;
1855                 }
1856         }
1857         if (found) {
1858                 sas_ex_join_wide_port(dev, phy_id);
1859                 return 0;
1860         }
1861         res = sas_ex_discover_devices(dev, phy_id);
1862         if (!res)
1863                 goto out;
1864         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1865                 if (SAS_ADDR(child->sas_addr) ==
1866                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1867                         if (child->dev_type == EDGE_DEV ||
1868                             child->dev_type == FANOUT_DEV)
1869                                 res = sas_discover_bfs_by_root(child);
1870                         break;
1871                 }
1872         }
1873 out:
1874         return res;
1875 }
1876
1877 static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
1878 {
1879         struct expander_device *ex = &dev->ex_dev;
1880         struct ex_phy *phy = &ex->ex_phy[phy_id];
1881         u8 attached_sas_addr[8];
1882         int res;
1883
1884         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1885         switch (res) {
1886         case SMP_RESP_NO_PHY:
1887                 phy->phy_state = PHY_NOT_PRESENT;
1888                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1889                 goto out; break;
1890         case SMP_RESP_PHY_VACANT:
1891                 phy->phy_state = PHY_VACANT;
1892                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1893                 goto out; break;
1894         case SMP_RESP_FUNC_ACC:
1895                 break;
1896         }
1897
1898         if (SAS_ADDR(attached_sas_addr) == 0) {
1899                 phy->phy_state = PHY_EMPTY;
1900                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1901         } else if (SAS_ADDR(attached_sas_addr) ==
1902                    SAS_ADDR(phy->attached_sas_addr)) {
1903                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1904                             SAS_ADDR(dev->sas_addr), phy_id);
1905                 sas_ex_phy_discover(dev, phy_id);
1906         } else
1907                 res = sas_discover_new(dev, phy_id);
1908 out:
1909         return res;
1910 }
1911
1912 /**
1913  * sas_rediscover - revalidate the domain.
1914  * @dev:domain device to be detect.
1915  * @phy_id: the phy id will be detected.
1916  *
1917  * NOTE: this process _must_ quit (return) as soon as any connection
1918  * errors are encountered.  Connection recovery is done elsewhere.
1919  * Discover process only interrogates devices in order to discover the
1920  * domain.For plugging out, we un-register the device only when it is
1921  * the last phy in the port, for other phys in this port, we just delete it
1922  * from the port.For inserting, we do discovery when it is the
1923  * first phy,for other phys in this port, we add it to the port to
1924  * forming the wide-port.
1925  */
1926 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1927 {
1928         struct expander_device *ex = &dev->ex_dev;
1929         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1930         int res = 0;
1931         int i;
1932         bool last = true;       /* is this the last phy of the port */
1933
1934         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1935                     SAS_ADDR(dev->sas_addr), phy_id);
1936
1937         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1938                 for (i = 0; i < ex->num_phys; i++) {
1939                         struct ex_phy *phy = &ex->ex_phy[i];
1940
1941                         if (i == phy_id)
1942                                 continue;
1943                         if (SAS_ADDR(phy->attached_sas_addr) ==
1944                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1945                                 SAS_DPRINTK("phy%d part of wide port with "
1946                                             "phy%d\n", phy_id, i);
1947                                 last = false;
1948                                 break;
1949                         }
1950                 }
1951                 res = sas_rediscover_dev(dev, phy_id, last);
1952         } else
1953                 res = sas_discover_new(dev, phy_id);
1954         return res;
1955 }
1956
1957 /**
1958  * sas_revalidate_domain -- revalidate the domain
1959  * @port: port to the domain of interest
1960  *
1961  * NOTE: this process _must_ quit (return) as soon as any connection
1962  * errors are encountered.  Connection recovery is done elsewhere.
1963  * Discover process only interrogates devices in order to discover the
1964  * domain.
1965  */
1966 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1967 {
1968         int res;
1969         struct domain_device *dev = NULL;
1970
1971         res = sas_find_bcast_dev(port_dev, &dev);
1972         if (res)
1973                 goto out;
1974         if (dev) {
1975                 struct expander_device *ex = &dev->ex_dev;
1976                 int i = 0, phy_id;
1977
1978                 do {
1979                         phy_id = -1;
1980                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
1981                         if (phy_id == -1)
1982                                 break;
1983                         res = sas_rediscover(dev, phy_id);
1984                         i = phy_id + 1;
1985                 } while (i < ex->num_phys);
1986         }
1987 out:
1988         return res;
1989 }
1990
1991 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1992                     struct request *req)
1993 {
1994         struct domain_device *dev;
1995         int ret, type;
1996         struct request *rsp = req->next_rq;
1997
1998         if (!rsp) {
1999                 printk("%s: space for a smp response is missing\n",
2000                        __func__);
2001                 return -EINVAL;
2002         }
2003
2004         /* no rphy means no smp target support (ie aic94xx host) */
2005         if (!rphy)
2006                 return sas_smp_host_handler(shost, req, rsp);
2007
2008         type = rphy->identify.device_type;
2009
2010         if (type != SAS_EDGE_EXPANDER_DEVICE &&
2011             type != SAS_FANOUT_EXPANDER_DEVICE) {
2012                 printk("%s: can we send a smp request to a device?\n",
2013                        __func__);
2014                 return -EINVAL;
2015         }
2016
2017         dev = sas_find_dev_by_rphy(rphy);
2018         if (!dev) {
2019                 printk("%s: fail to find a domain_device?\n", __func__);
2020                 return -EINVAL;
2021         }
2022
2023         /* do we need to support multiple segments? */
2024         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2025                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
2026                        __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2027                        rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
2028                 return -EINVAL;
2029         }
2030
2031         ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2032                                bio_data(rsp->bio), blk_rq_bytes(rsp));
2033         if (ret > 0) {
2034                 /* positive number is the untransferred residual */
2035                 rsp->resid_len = ret;
2036                 req->resid_len = 0;
2037                 ret = 0;
2038         } else if (ret == 0) {
2039                 rsp->resid_len = 0;
2040                 req->resid_len = 0;
2041         }
2042
2043         return ret;
2044 }