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         /* help some expanders that fail to zero sas_address in the 'no
 196          * device' case
 197          */
 198         if (phy->attached_dev_type == NO_DEVICE ||
 199             phy->linkrate < SAS_LINK_RATE_1_5_GBPS)
 200                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 201         else
 202                 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 203         phy->attached_phy_id = dr->attached_phy_id;
 204         phy->phy_change_count = dr->change_count;
 205         phy->routing_attr = dr->routing_attr;
 206         phy->virtual = dr->virtual;
 207         phy->last_da_index = -1;
 208
 209         phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
 210         phy->phy->identify.device_type = phy->attached_dev_type;
 211         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 212         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 213         phy->phy->identify.phy_identifier = phy_id;
 214         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 215         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 216         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 217         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 218         phy->phy->negotiated_linkrate = phy->linkrate;
 219
 220         if (!rediscover)
 221                 if (sas_phy_add(phy->phy)) {
 222                         sas_phy_free(phy->phy);
 223                         return;
 224                 }
 225
 226         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 227                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 228                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 229                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 230                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 231                     SAS_ADDR(phy->attached_sas_addr));
 232
 233         return;
 234 }
 235
 236 #define DISCOVER_REQ_SIZE  16
 237 #define DISCOVER_RESP_SIZE 56
 238
 239 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 240                                       u8 *disc_resp, int single)
 241 {
 242         int i, res;
 243
 244         disc_req[9] = single;
 245         for (i = 1 ; i < 3; i++) {
 246                 struct discover_resp *dr;
 247
 248                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 249                                        disc_resp, DISCOVER_RESP_SIZE);
 250                 if (res)
 251                         return res;
 252                 /* This is detecting a failure to transmit initial
 253                  * dev to host FIS as described in section G.5 of
 254                  * sas-2 r 04b */
 255                 dr = &((struct smp_resp *)disc_resp)->disc;
 256                 if (memcmp(dev->sas_addr, dr->attached_sas_addr,
 257                           SAS_ADDR_SIZE) == 0) {
 258                         sas_printk("Found loopback topology, just ignore it!\n");
 259                         return 0;
 260                 }
 261                 if (!(dr->attached_dev_type == 0 &&
 262                       dr->attached_sata_dev))
 263                         break;
 264                 /* In order to generate the dev to host FIS, we
 265                  * send a link reset to the expander port */
 266                 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
 267                 /* Wait for the reset to trigger the negotiation */
 268                 msleep(500);
 269         }
 270         sas_set_ex_phy(dev, single, disc_resp);
 271         return 0;
 272 }
 273
 274 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 275 {
 276         struct expander_device *ex = &dev->ex_dev;
 277         int  res = 0;
 278         u8   *disc_req;
 279         u8   *disc_resp;
 280
 281         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 282         if (!disc_req)
 283                 return -ENOMEM;
 284
 285         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 286         if (!disc_resp) {
 287                 kfree(disc_req);
 288                 return -ENOMEM;
 289         }
 290
 291         disc_req[1] = SMP_DISCOVER;
 292
 293         if (0 <= single && single < ex->num_phys) {
 294                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 295         } else {
 296                 int i;
 297
 298                 for (i = 0; i < ex->num_phys; i++) {
 299                         res = sas_ex_phy_discover_helper(dev, disc_req,
 300                                                          disc_resp, i);
 301                         if (res)
 302                                 goto out_err;
 303                 }
 304         }
 305 out_err:
 306         kfree(disc_resp);
 307         kfree(disc_req);
 308         return res;
 309 }
 310
 311 static int sas_expander_discover(struct domain_device *dev)
 312 {
 313         struct expander_device *ex = &dev->ex_dev;
 314         int res = -ENOMEM;
 315
 316         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 317         if (!ex->ex_phy)
 318                 return -ENOMEM;
 319
 320         res = sas_ex_phy_discover(dev, -1);
 321         if (res)
 322                 goto out_err;
 323
 324         return 0;
 325  out_err:
 326         kfree(ex->ex_phy);
 327         ex->ex_phy = NULL;
 328         return res;
 329 }
 330
 331 #define MAX_EXPANDER_PHYS 128
 332
 333 static void ex_assign_report_general(struct domain_device *dev,
 334                                             struct smp_resp *resp)
 335 {
 336         struct report_general_resp *rg = &resp->rg;
 337
 338         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 339         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 340         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 341         dev->ex_dev.t2t_supp = rg->t2t_supp;
 342         dev->ex_dev.conf_route_table = rg->conf_route_table;
 343         dev->ex_dev.configuring = rg->configuring;
 344         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 345 }
 346
 347 #define RG_REQ_SIZE   8
 348 #define RG_RESP_SIZE 32
 349
 350 static int sas_ex_general(struct domain_device *dev)
 351 {
 352         u8 *rg_req;
 353         struct smp_resp *rg_resp;
 354         int res;
 355         int i;
 356
 357         rg_req = alloc_smp_req(RG_REQ_SIZE);
 358         if (!rg_req)
 359                 return -ENOMEM;
 360
 361         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 362         if (!rg_resp) {
 363                 kfree(rg_req);
 364                 return -ENOMEM;
 365         }
 366
 367         rg_req[1] = SMP_REPORT_GENERAL;
 368
 369         for (i = 0; i < 5; i++) {
 370                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 371                                        RG_RESP_SIZE);
 372
 373                 if (res) {
 374                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 375                                     SAS_ADDR(dev->sas_addr), res);
 376                         goto out;
 377                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 378                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 379                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 380                         res = rg_resp->result;
 381                         goto out;
 382                 }
 383
 384                 ex_assign_report_general(dev, rg_resp);
 385
 386                 if (dev->ex_dev.configuring) {
 387                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 388                                     SAS_ADDR(dev->sas_addr));
 389                         schedule_timeout_interruptible(5*HZ);
 390                 } else
 391                         break;
 392         }
 393 out:
 394         kfree(rg_req);
 395         kfree(rg_resp);
 396         return res;
 397 }
 398
 399 static void ex_assign_manuf_info(struct domain_device *dev, void
 400                                         *_mi_resp)
 401 {
 402         u8 *mi_resp = _mi_resp;
 403         struct sas_rphy *rphy = dev->rphy;
 404         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 405
 406         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 407         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 408         memcpy(edev->product_rev, mi_resp + 36,
 409                SAS_EXPANDER_PRODUCT_REV_LEN);
 410
 411         if (mi_resp[8] & 1) {
 412                 memcpy(edev->component_vendor_id, mi_resp + 40,
 413                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 414                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 415                 edev->component_revision_id = mi_resp[50];
 416         }
 417 }
 418
 419 #define MI_REQ_SIZE   8
 420 #define MI_RESP_SIZE 64
 421
 422 static int sas_ex_manuf_info(struct domain_device *dev)
 423 {
 424         u8 *mi_req;
 425         u8 *mi_resp;
 426         int res;
 427
 428         mi_req = alloc_smp_req(MI_REQ_SIZE);
 429         if (!mi_req)
 430                 return -ENOMEM;
 431
 432         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 433         if (!mi_resp) {
 434                 kfree(mi_req);
 435                 return -ENOMEM;
 436         }
 437
 438         mi_req[1] = SMP_REPORT_MANUF_INFO;
 439
 440         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 441         if (res) {
 442                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 443                             SAS_ADDR(dev->sas_addr), res);
 444                 goto out;
 445         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 446                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 447                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 448                 goto out;
 449         }
 450
 451         ex_assign_manuf_info(dev, mi_resp);
 452 out:
 453         kfree(mi_req);
 454         kfree(mi_resp);
 455         return res;
 456 }
 457
 458 #define PC_REQ_SIZE  44
 459 #define PC_RESP_SIZE 8
 460
 461 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 462                         enum phy_func phy_func,
 463                         struct sas_phy_linkrates *rates)
 464 {
 465         u8 *pc_req;
 466         u8 *pc_resp;
 467         int res;
 468
 469         pc_req = alloc_smp_req(PC_REQ_SIZE);
 470         if (!pc_req)
 471                 return -ENOMEM;
 472
 473         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 474         if (!pc_resp) {
 475                 kfree(pc_req);
 476                 return -ENOMEM;
 477         }
 478
 479         pc_req[1] = SMP_PHY_CONTROL;
 480         pc_req[9] = phy_id;
 481         pc_req[10]= phy_func;
 482         if (rates) {
 483                 pc_req[32] = rates->minimum_linkrate << 4;
 484                 pc_req[33] = rates->maximum_linkrate << 4;
 485         }
 486
 487         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 488
 489         kfree(pc_resp);
 490         kfree(pc_req);
 491         return res;
 492 }
 493
 494 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 495 {
 496         struct expander_device *ex = &dev->ex_dev;
 497         struct ex_phy *phy = &ex->ex_phy[phy_id];
 498
 499         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 500         phy->linkrate = SAS_PHY_DISABLED;
 501 }
 502
 503 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 504 {
 505         struct expander_device *ex = &dev->ex_dev;
 506         int i;
 507
 508         for (i = 0; i < ex->num_phys; i++) {
 509                 struct ex_phy *phy = &ex->ex_phy[i];
 510
 511                 if (phy->phy_state == PHY_VACANT ||
 512                     phy->phy_state == PHY_NOT_PRESENT)
 513                         continue;
 514
 515                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 516                         sas_ex_disable_phy(dev, i);
 517         }
 518 }
 519
 520 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 521                                             u8 *sas_addr)
 522 {
 523         struct domain_device *dev;
 524
 525         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 526                 return 1;
 527         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 528                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 529                         return 1;
 530         }
 531         return 0;
 532 }
 533
 534 #define RPEL_REQ_SIZE   16
 535 #define RPEL_RESP_SIZE  32
 536 int sas_smp_get_phy_events(struct sas_phy *phy)
 537 {
 538         int res;
 539         u8 *req;
 540         u8 *resp;
 541         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 542         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 543
 544         req = alloc_smp_req(RPEL_REQ_SIZE);
 545         if (!req)
 546                 return -ENOMEM;
 547
 548         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 549         if (!resp) {
 550                 kfree(req);
 551                 return -ENOMEM;
 552         }
 553
 554         req[1] = SMP_REPORT_PHY_ERR_LOG;
 555         req[9] = phy->number;
 556
 557         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 558                                     resp, RPEL_RESP_SIZE);
 559
 560         if (!res)
 561                 goto out;
 562
 563         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 564         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 565         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 566         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 567
 568  out:
 569         kfree(resp);
 570         return res;
 571
 572 }
 573
 574 #ifdef CONFIG_SCSI_SAS_ATA
 575
 576 #define RPS_REQ_SIZE  16
 577 #define RPS_RESP_SIZE 60
 578
 579 static int sas_get_report_phy_sata(struct domain_device *dev,
 580                                           int phy_id,
 581                                           struct smp_resp *rps_resp)
 582 {
 583         int res;
 584         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 585         u8 *resp = (u8 *)rps_resp;
 586
 587         if (!rps_req)
 588                 return -ENOMEM;
 589
 590         rps_req[1] = SMP_REPORT_PHY_SATA;
 591         rps_req[9] = phy_id;
 592
 593         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 594                                     rps_resp, RPS_RESP_SIZE);
 595
 596         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 597          * standards cockup here.  sas-2 explicitly specifies the FIS
 598          * should be encoded so that FIS type is in resp[24].
 599          * However, some expanders endian reverse this.  Undo the
 600          * reversal here */
 601         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 602                 int i;
 603
 604                 for (i = 0; i < 5; i++) {
 605                         int j = 24 + (i*4);
 606                         u8 a, b;
 607                         a = resp[j + 0];
 608                         b = resp[j + 1];
 609                         resp[j + 0] = resp[j + 3];
 610                         resp[j + 1] = resp[j + 2];
 611                         resp[j + 2] = b;
 612                         resp[j + 3] = a;
 613                 }
 614         }
 615
 616         kfree(rps_req);
 617         return res;
 618 }
 619 #endif
 620
 621 static void sas_ex_get_linkrate(struct domain_device *parent,
 622                                        struct domain_device *child,
 623                                        struct ex_phy *parent_phy)
 624 {
 625         struct expander_device *parent_ex = &parent->ex_dev;
 626         struct sas_port *port;
 627         int i;
 628
 629         child->pathways = 0;
 630
 631         port = parent_phy->port;
 632
 633         for (i = 0; i < parent_ex->num_phys; i++) {
 634                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 635
 636                 if (phy->phy_state == PHY_VACANT ||
 637                     phy->phy_state == PHY_NOT_PRESENT)
 638                         continue;
 639
 640                 if (SAS_ADDR(phy->attached_sas_addr) ==
 641                     SAS_ADDR(child->sas_addr)) {
 642
 643                         child->min_linkrate = min(parent->min_linkrate,
 644                                                   phy->linkrate);
 645                         child->max_linkrate = max(parent->max_linkrate,
 646                                                   phy->linkrate);
 647                         child->pathways++;
 648                         sas_port_add_phy(port, phy->phy);
 649                 }
 650         }
 651         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 652         child->pathways = min(child->pathways, parent->pathways);
 653 }
 654
 655 static struct domain_device *sas_ex_discover_end_dev(
 656         struct domain_device *parent, int phy_id)
 657 {
 658         struct expander_device *parent_ex = &parent->ex_dev;
 659         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 660         struct domain_device *child = NULL;
 661         struct sas_rphy *rphy;
 662         int res;
 663
 664         if (phy->attached_sata_host || phy->attached_sata_ps)
 665                 return NULL;
 666
 667         child = kzalloc(sizeof(*child), GFP_KERNEL);
 668         if (!child)
 669                 return NULL;
 670
 671         child->parent = parent;
 672         child->port   = parent->port;
 673         child->iproto = phy->attached_iproto;
 674         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 675         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 676         if (!phy->port) {
 677                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 678                 if (unlikely(!phy->port))
 679                         goto out_err;
 680                 if (unlikely(sas_port_add(phy->port) != 0)) {
 681                         sas_port_free(phy->port);
 682                         goto out_err;
 683                 }
 684         }
 685         sas_ex_get_linkrate(parent, child, phy);
 686
 687 #ifdef CONFIG_SCSI_SAS_ATA
 688         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 689                 child->dev_type = SATA_DEV;
 690                 if (phy->attached_tproto & SAS_PROTOCOL_STP)
 691                         child->tproto = phy->attached_tproto;
 692                 if (phy->attached_sata_dev)
 693                         child->tproto |= SATA_DEV;
 694                 res = sas_get_report_phy_sata(parent, phy_id,
 695                                               &child->sata_dev.rps_resp);
 696                 if (res) {
 697                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 698                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 699                                     phy_id, res);
 700                         goto out_free;
 701                 }
 702                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 703                        sizeof(struct dev_to_host_fis));
 704
 705                 rphy = sas_end_device_alloc(phy->port);
 706                 if (unlikely(!rphy))
 707                         goto out_free;
 708
 709                 sas_init_dev(child);
 710
 711                 child->rphy = rphy;
 712
 713                 spin_lock_irq(&parent->port->dev_list_lock);
 714                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 715                 spin_unlock_irq(&parent->port->dev_list_lock);
 716
 717                 res = sas_discover_sata(child);
 718                 if (res) {
 719                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 720                                     "%016llx:0x%x returned 0x%x\n",
 721                                     SAS_ADDR(child->sas_addr),
 722                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 723                         goto out_list_del;
 724                 }
 725         } else
 726 #endif
 727           if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 728                 child->dev_type = SAS_END_DEV;
 729                 rphy = sas_end_device_alloc(phy->port);
 730                 /* FIXME: error handling */
 731                 if (unlikely(!rphy))
 732                         goto out_free;
 733                 child->tproto = phy->attached_tproto;
 734                 sas_init_dev(child);
 735
 736                 child->rphy = rphy;
 737                 sas_fill_in_rphy(child, rphy);
 738
 739                 spin_lock_irq(&parent->port->dev_list_lock);
 740                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 741                 spin_unlock_irq(&parent->port->dev_list_lock);
 742
 743                 res = sas_discover_end_dev(child);
 744                 if (res) {
 745                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 746                                     "at %016llx:0x%x returned 0x%x\n",
 747                                     SAS_ADDR(child->sas_addr),
 748                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 749                         goto out_list_del;
 750                 }
 751         } else {
 752                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 753                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 754                             phy_id);
 755                 goto out_free;
 756         }
 757
 758         list_add_tail(&child->siblings, &parent_ex->children);
 759         return child;
 760
 761  out_list_del:
 762         sas_rphy_free(child->rphy);
 763         child->rphy = NULL;
 764
 765         spin_lock_irq(&parent->port->dev_list_lock);
 766         list_del(&child->dev_list_node);
 767         spin_unlock_irq(&parent->port->dev_list_lock);
 768  out_free:
 769         sas_port_delete(phy->port);
 770  out_err:
 771         phy->port = NULL;
 772         kfree(child);
 773         return NULL;
 774 }
 775
 776 /* See if this phy is part of a wide port */
 777 static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 778 {
 779         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 780         int i;
 781
 782         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 783                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 784
 785                 if (ephy == phy)
 786                         continue;
 787
 788                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 789                             SAS_ADDR_SIZE) && ephy->port) {
 790                         sas_port_add_phy(ephy->port, phy->phy);
 791                         phy->port = ephy->port;
 792                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 793                         return true;
 794                 }
 795         }
 796
 797         return false;
 798 }
 799
 800 static struct domain_device *sas_ex_discover_expander(
 801         struct domain_device *parent, int phy_id)
 802 {
 803         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 804         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 805         struct domain_device *child = NULL;
 806         struct sas_rphy *rphy;
 807         struct sas_expander_device *edev;
 808         struct asd_sas_port *port;
 809         int res;
 810
 811         if (phy->routing_attr == DIRECT_ROUTING) {
 812                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 813                             "allowed\n",
 814                             SAS_ADDR(parent->sas_addr), phy_id,
 815                             SAS_ADDR(phy->attached_sas_addr),
 816                             phy->attached_phy_id);
 817                 return NULL;
 818         }
 819         child = kzalloc(sizeof(*child), GFP_KERNEL);
 820         if (!child)
 821                 return NULL;
 822
 823         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 824         /* FIXME: better error handling */
 825         BUG_ON(sas_port_add(phy->port) != 0);
 826
 827
 828         switch (phy->attached_dev_type) {
 829         case EDGE_DEV:
 830                 rphy = sas_expander_alloc(phy->port,
 831                                           SAS_EDGE_EXPANDER_DEVICE);
 832                 break;
 833         case FANOUT_DEV:
 834                 rphy = sas_expander_alloc(phy->port,
 835                                           SAS_FANOUT_EXPANDER_DEVICE);
 836                 break;
 837         default:
 838                 rphy = NULL;    /* shut gcc up */
 839                 BUG();
 840         }
 841         port = parent->port;
 842         child->rphy = rphy;
 843         edev = rphy_to_expander_device(rphy);
 844         child->dev_type = phy->attached_dev_type;
 845         child->parent = parent;
 846         child->port = port;
 847         child->iproto = phy->attached_iproto;
 848         child->tproto = phy->attached_tproto;
 849         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 850         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 851         sas_ex_get_linkrate(parent, child, phy);
 852         edev->level = parent_ex->level + 1;
 853         parent->port->disc.max_level = max(parent->port->disc.max_level,
 854                                            edev->level);
 855         sas_init_dev(child);
 856         sas_fill_in_rphy(child, rphy);
 857         sas_rphy_add(rphy);
 858
 859         spin_lock_irq(&parent->port->dev_list_lock);
 860         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 861         spin_unlock_irq(&parent->port->dev_list_lock);
 862
 863         res = sas_discover_expander(child);
 864         if (res) {
 865                 spin_lock_irq(&parent->port->dev_list_lock);
 866                 list_del(&child->dev_list_node);
 867                 spin_unlock_irq(&parent->port->dev_list_lock);
 868                 kfree(child);
 869                 return NULL;
 870         }
 871         list_add_tail(&child->siblings, &parent->ex_dev.children);
 872         return child;
 873 }
 874
 875 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 876 {
 877         struct expander_device *ex = &dev->ex_dev;
 878         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 879         struct domain_device *child = NULL;
 880         int res = 0;
 881
 882         /* Phy state */
 883         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 884                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 885                         res = sas_ex_phy_discover(dev, phy_id);
 886                 if (res)
 887                         return res;
 888         }
 889
 890         /* Parent and domain coherency */
 891         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 892                              SAS_ADDR(dev->port->sas_addr))) {
 893                 sas_add_parent_port(dev, phy_id);
 894                 return 0;
 895         }
 896         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 897                             SAS_ADDR(dev->parent->sas_addr))) {
 898                 sas_add_parent_port(dev, phy_id);
 899                 if (ex_phy->routing_attr == TABLE_ROUTING)
 900                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 901                 return 0;
 902         }
 903
 904         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 905                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 906
 907         if (ex_phy->attached_dev_type == NO_DEVICE) {
 908                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 909                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 910                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 911                 }
 912                 return 0;
 913         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 914                 return 0;
 915
 916         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 917             ex_phy->attached_dev_type != FANOUT_DEV &&
 918             ex_phy->attached_dev_type != EDGE_DEV) {
 919                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 920                             "phy 0x%x\n", ex_phy->attached_dev_type,
 921                             SAS_ADDR(dev->sas_addr),
 922                             phy_id);
 923                 return 0;
 924         }
 925
 926         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 927         if (res) {
 928                 SAS_DPRINTK("configure routing for dev %016llx "
 929                             "reported 0x%x. Forgotten\n",
 930                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 931                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 932                 return res;
 933         }
 934
 935         if (sas_ex_join_wide_port(dev, phy_id)) {
 936                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 937                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 938                 return res;
 939         }
 940
 941         switch (ex_phy->attached_dev_type) {
 942         case SAS_END_DEV:
 943                 child = sas_ex_discover_end_dev(dev, phy_id);
 944                 break;
 945         case FANOUT_DEV:
 946                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 947                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 948                                     "attached to ex %016llx phy 0x%x\n",
 949                                     SAS_ADDR(ex_phy->attached_sas_addr),
 950                                     ex_phy->attached_phy_id,
 951                                     SAS_ADDR(dev->sas_addr),
 952                                     phy_id);
 953                         sas_ex_disable_phy(dev, phy_id);
 954                         break;
 955                 } else
 956                         memcpy(dev->port->disc.fanout_sas_addr,
 957                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 958                 /* fallthrough */
 959         case EDGE_DEV:
 960                 child = sas_ex_discover_expander(dev, phy_id);
 961                 break;
 962         default:
 963                 break;
 964         }
 965
 966         if (child) {
 967                 int i;
 968
 969                 for (i = 0; i < ex->num_phys; i++) {
 970                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 971                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 972                                 continue;
 973                         /*
 974                          * Due to races, the phy might not get added to the
 975                          * wide port, so we add the phy to the wide port here.
 976                          */
 977                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 978                             SAS_ADDR(child->sas_addr)) {
 979                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 980                                 if (sas_ex_join_wide_port(dev, i))
 981                                         SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 982                                                     i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
 983
 984                         }
 985                 }
 986         }
 987
 988         return res;
 989 }
 990
 991 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 992 {
 993         struct expander_device *ex = &dev->ex_dev;
 994         int i;
 995
 996         for (i = 0; i < ex->num_phys; i++) {
 997                 struct ex_phy *phy = &ex->ex_phy[i];
 998
 999                 if (phy->phy_state == PHY_VACANT ||
1000                     phy->phy_state == PHY_NOT_PRESENT)
1001                         continue;
1002
1003                 if ((phy->attached_dev_type == EDGE_DEV ||
1004                      phy->attached_dev_type == FANOUT_DEV) &&
1005                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1006
1007                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1008
1009                         return 1;
1010                 }
1011         }
1012         return 0;
1013 }
1014
1015 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1016 {
1017         struct expander_device *ex = &dev->ex_dev;
1018         struct domain_device *child;
1019         u8 sub_addr[8] = {0, };
1020
1021         list_for_each_entry(child, &ex->children, siblings) {
1022                 if (child->dev_type != EDGE_DEV &&
1023                     child->dev_type != FANOUT_DEV)
1024                         continue;
1025                 if (sub_addr[0] == 0) {
1026                         sas_find_sub_addr(child, sub_addr);
1027                         continue;
1028                 } else {
1029                         u8 s2[8];
1030
1031                         if (sas_find_sub_addr(child, s2) &&
1032                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1033
1034                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1035                                             "diverges from subtractive "
1036                                             "boundary %016llx\n",
1037                                             SAS_ADDR(dev->sas_addr),
1038                                             SAS_ADDR(child->sas_addr),
1039                                             SAS_ADDR(s2),
1040                                             SAS_ADDR(sub_addr));
1041
1042                                 sas_ex_disable_port(child, s2);
1043                         }
1044                 }
1045         }
1046         return 0;
1047 }
1048 /**
1049  * sas_ex_discover_devices -- discover devices attached to this expander
1050  * dev: pointer to the expander domain device
1051  * single: if you want to do a single phy, else set to -1;
1052  *
1053  * Configure this expander for use with its devices and register the
1054  * devices of this expander.
1055  */
1056 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1057 {
1058         struct expander_device *ex = &dev->ex_dev;
1059         int i = 0, end = ex->num_phys;
1060         int res = 0;
1061
1062         if (0 <= single && single < end) {
1063                 i = single;
1064                 end = i+1;
1065         }
1066
1067         for ( ; i < end; i++) {
1068                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1069
1070                 if (ex_phy->phy_state == PHY_VACANT ||
1071                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1072                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1073                         continue;
1074
1075                 switch (ex_phy->linkrate) {
1076                 case SAS_PHY_DISABLED:
1077                 case SAS_PHY_RESET_PROBLEM:
1078                 case SAS_SATA_PORT_SELECTOR:
1079                         continue;
1080                 default:
1081                         res = sas_ex_discover_dev(dev, i);
1082                         if (res)
1083                                 break;
1084                         continue;
1085                 }
1086         }
1087
1088         if (!res)
1089                 sas_check_level_subtractive_boundary(dev);
1090
1091         return res;
1092 }
1093
1094 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1095 {
1096         struct expander_device *ex = &dev->ex_dev;
1097         int i;
1098         u8  *sub_sas_addr = NULL;
1099
1100         if (dev->dev_type != EDGE_DEV)
1101                 return 0;
1102
1103         for (i = 0; i < ex->num_phys; i++) {
1104                 struct ex_phy *phy = &ex->ex_phy[i];
1105
1106                 if (phy->phy_state == PHY_VACANT ||
1107                     phy->phy_state == PHY_NOT_PRESENT)
1108                         continue;
1109
1110                 if ((phy->attached_dev_type == FANOUT_DEV ||
1111                      phy->attached_dev_type == EDGE_DEV) &&
1112                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1113
1114                         if (!sub_sas_addr)
1115                                 sub_sas_addr = &phy->attached_sas_addr[0];
1116                         else if (SAS_ADDR(sub_sas_addr) !=
1117                                  SAS_ADDR(phy->attached_sas_addr)) {
1118
1119                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1120                                             "diverges(%016llx) on subtractive "
1121                                             "boundary(%016llx). Disabled\n",
1122                                             SAS_ADDR(dev->sas_addr), i,
1123                                             SAS_ADDR(phy->attached_sas_addr),
1124                                             SAS_ADDR(sub_sas_addr));
1125                                 sas_ex_disable_phy(dev, i);
1126                         }
1127                 }
1128         }
1129         return 0;
1130 }
1131
1132 static void sas_print_parent_topology_bug(struct domain_device *child,
1133                                                  struct ex_phy *parent_phy,
1134                                                  struct ex_phy *child_phy)
1135 {
1136         static const char ra_char[] = {
1137                 [DIRECT_ROUTING] = 'D',
1138                 [SUBTRACTIVE_ROUTING] = 'S',
1139                 [TABLE_ROUTING] = 'T',
1140         };
1141         static const char *ex_type[] = {
1142                 [EDGE_DEV] = "edge",
1143                 [FANOUT_DEV] = "fanout",
1144         };
1145         struct domain_device *parent = child->parent;
1146
1147         sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
1148                    "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
1149
1150                    ex_type[parent->dev_type],
1151                    SAS_ADDR(parent->sas_addr),
1152                    parent->ex_dev.t2t_supp,
1153                    parent_phy->phy_id,
1154
1155                    ex_type[child->dev_type],
1156                    SAS_ADDR(child->sas_addr),
1157                    child->ex_dev.t2t_supp,
1158                    child_phy->phy_id,
1159
1160                    ra_char[parent_phy->routing_attr],
1161                    ra_char[child_phy->routing_attr]);
1162 }
1163
1164 static int sas_check_eeds(struct domain_device *child,
1165                                  struct ex_phy *parent_phy,
1166                                  struct ex_phy *child_phy)
1167 {
1168         int res = 0;
1169         struct domain_device *parent = child->parent;
1170
1171         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1172                 res = -ENODEV;
1173                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1174                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1175                             SAS_ADDR(parent->sas_addr),
1176                             parent_phy->phy_id,
1177                             SAS_ADDR(child->sas_addr),
1178                             child_phy->phy_id,
1179                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1180         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1181                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1182                        SAS_ADDR_SIZE);
1183                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1184                        SAS_ADDR_SIZE);
1185         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1186                     SAS_ADDR(parent->sas_addr)) ||
1187                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1188                     SAS_ADDR(child->sas_addr)))
1189                    &&
1190                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1191                      SAS_ADDR(parent->sas_addr)) ||
1192                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1193                      SAS_ADDR(child->sas_addr))))
1194                 ;
1195         else {
1196                 res = -ENODEV;
1197                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1198                             "phy 0x%x link forms a third EEDS!\n",
1199                             SAS_ADDR(parent->sas_addr),
1200                             parent_phy->phy_id,
1201                             SAS_ADDR(child->sas_addr),
1202                             child_phy->phy_id);
1203         }
1204
1205         return res;
1206 }
1207
1208 /* Here we spill over 80 columns.  It is intentional.
1209  */
1210 static int sas_check_parent_topology(struct domain_device *child)
1211 {
1212         struct expander_device *child_ex = &child->ex_dev;
1213         struct expander_device *parent_ex;
1214         int i;
1215         int res = 0;
1216
1217         if (!child->parent)
1218                 return 0;
1219
1220         if (child->parent->dev_type != EDGE_DEV &&
1221             child->parent->dev_type != FANOUT_DEV)
1222                 return 0;
1223
1224         parent_ex = &child->parent->ex_dev;
1225
1226         for (i = 0; i < parent_ex->num_phys; i++) {
1227                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1228                 struct ex_phy *child_phy;
1229
1230                 if (parent_phy->phy_state == PHY_VACANT ||
1231                     parent_phy->phy_state == PHY_NOT_PRESENT)
1232                         continue;
1233
1234                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1235                         continue;
1236
1237                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1238
1239                 switch (child->parent->dev_type) {
1240                 case EDGE_DEV:
1241                         if (child->dev_type == FANOUT_DEV) {
1242                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1243                                     child_phy->routing_attr != TABLE_ROUTING) {
1244                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1245                                         res = -ENODEV;
1246                                 }
1247                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1248                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1249                                         res = sas_check_eeds(child, parent_phy, child_phy);
1250                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1251                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1252                                         res = -ENODEV;
1253                                 }
1254                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1255                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1256                                     (child_phy->routing_attr == TABLE_ROUTING &&
1257                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1258                                         /* All good */;
1259                                 } else {
1260                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1261                                         res = -ENODEV;
1262                                 }
1263                         }
1264                         break;
1265                 case FANOUT_DEV:
1266                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1267                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1268                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1269                                 res = -ENODEV;
1270                         }
1271                         break;
1272                 default:
1273                         break;
1274                 }
1275         }
1276
1277         return res;
1278 }
1279
1280 #define RRI_REQ_SIZE  16
1281 #define RRI_RESP_SIZE 44
1282
1283 static int sas_configure_present(struct domain_device *dev, int phy_id,
1284                                  u8 *sas_addr, int *index, int *present)
1285 {
1286         int i, res = 0;
1287         struct expander_device *ex = &dev->ex_dev;
1288         struct ex_phy *phy = &ex->ex_phy[phy_id];
1289         u8 *rri_req;
1290         u8 *rri_resp;
1291
1292         *present = 0;
1293         *index = 0;
1294
1295         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1296         if (!rri_req)
1297                 return -ENOMEM;
1298
1299         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1300         if (!rri_resp) {
1301                 kfree(rri_req);
1302                 return -ENOMEM;
1303         }
1304
1305         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1306         rri_req[9] = phy_id;
1307
1308         for (i = 0; i < ex->max_route_indexes ; i++) {
1309                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1310                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1311                                        RRI_RESP_SIZE);
1312                 if (res)
1313                         goto out;
1314                 res = rri_resp[2];
1315                 if (res == SMP_RESP_NO_INDEX) {
1316                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1317                                     "phy 0x%x index 0x%x\n",
1318                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1319                         goto out;
1320                 } else if (res != SMP_RESP_FUNC_ACC) {
1321                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1322                                     "result 0x%x\n", __func__,
1323                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1324                         goto out;
1325                 }
1326                 if (SAS_ADDR(sas_addr) != 0) {
1327                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1328                                 *index = i;
1329                                 if ((rri_resp[12] & 0x80) == 0x80)
1330                                         *present = 0;
1331                                 else
1332                                         *present = 1;
1333                                 goto out;
1334                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1335                                 *index = i;
1336                                 *present = 0;
1337                                 goto out;
1338                         }
1339                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1340                            phy->last_da_index < i) {
1341                         phy->last_da_index = i;
1342                         *index = i;
1343                         *present = 0;
1344                         goto out;
1345                 }
1346         }
1347         res = -1;
1348 out:
1349         kfree(rri_req);
1350         kfree(rri_resp);
1351         return res;
1352 }
1353
1354 #define CRI_REQ_SIZE  44
1355 #define CRI_RESP_SIZE  8
1356
1357 static int sas_configure_set(struct domain_device *dev, int phy_id,
1358                              u8 *sas_addr, int index, int include)
1359 {
1360         int res;
1361         u8 *cri_req;
1362         u8 *cri_resp;
1363
1364         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1365         if (!cri_req)
1366                 return -ENOMEM;
1367
1368         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1369         if (!cri_resp) {
1370                 kfree(cri_req);
1371                 return -ENOMEM;
1372         }
1373
1374         cri_req[1] = SMP_CONF_ROUTE_INFO;
1375         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1376         cri_req[9] = phy_id;
1377         if (SAS_ADDR(sas_addr) == 0 || !include)
1378                 cri_req[12] |= 0x80;
1379         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1380
1381         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1382                                CRI_RESP_SIZE);
1383         if (res)
1384                 goto out;
1385         res = cri_resp[2];
1386         if (res == SMP_RESP_NO_INDEX) {
1387                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1388                             "index 0x%x\n",
1389                             SAS_ADDR(dev->sas_addr), phy_id, index);
1390         }
1391 out:
1392         kfree(cri_req);
1393         kfree(cri_resp);
1394         return res;
1395 }
1396
1397 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1398                                     u8 *sas_addr, int include)
1399 {
1400         int index;
1401         int present;
1402         int res;
1403
1404         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1405         if (res)
1406                 return res;
1407         if (include ^ present)
1408                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1409
1410         return res;
1411 }
1412
1413 /**
1414  * sas_configure_parent -- configure routing table of parent
1415  * parent: parent expander
1416  * child: child expander
1417  * sas_addr: SAS port identifier of device directly attached to child
1418  */
1419 static int sas_configure_parent(struct domain_device *parent,
1420                                 struct domain_device *child,
1421                                 u8 *sas_addr, int include)
1422 {
1423         struct expander_device *ex_parent = &parent->ex_dev;
1424         int res = 0;
1425         int i;
1426
1427         if (parent->parent) {
1428                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1429                                            include);
1430                 if (res)
1431                         return res;
1432         }
1433
1434         if (ex_parent->conf_route_table == 0) {
1435                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1436                             SAS_ADDR(parent->sas_addr));
1437                 return 0;
1438         }
1439
1440         for (i = 0; i < ex_parent->num_phys; i++) {
1441                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1442
1443                 if ((phy->routing_attr == TABLE_ROUTING) &&
1444                     (SAS_ADDR(phy->attached_sas_addr) ==
1445                      SAS_ADDR(child->sas_addr))) {
1446                         res = sas_configure_phy(parent, i, sas_addr, include);
1447                         if (res)
1448                                 return res;
1449                 }
1450         }
1451
1452         return res;
1453 }
1454
1455 /**
1456  * sas_configure_routing -- configure routing
1457  * dev: expander device
1458  * sas_addr: port identifier of device directly attached to the expander device
1459  */
1460 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1461 {
1462         if (dev->parent)
1463                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1464         return 0;
1465 }
1466
1467 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1468 {
1469         if (dev->parent)
1470                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1471         return 0;
1472 }
1473
1474 /**
1475  * sas_discover_expander -- expander discovery
1476  * @ex: pointer to expander domain device
1477  *
1478  * See comment in sas_discover_sata().
1479  */
1480 static int sas_discover_expander(struct domain_device *dev)
1481 {
1482         int res;
1483
1484         res = sas_notify_lldd_dev_found(dev);
1485         if (res)
1486                 return res;
1487
1488         res = sas_ex_general(dev);
1489         if (res)
1490                 goto out_err;
1491         res = sas_ex_manuf_info(dev);
1492         if (res)
1493                 goto out_err;
1494
1495         res = sas_expander_discover(dev);
1496         if (res) {
1497                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1498                             SAS_ADDR(dev->sas_addr), res);
1499                 goto out_err;
1500         }
1501
1502         sas_check_ex_subtractive_boundary(dev);
1503         res = sas_check_parent_topology(dev);
1504         if (res)
1505                 goto out_err;
1506         return 0;
1507 out_err:
1508         sas_notify_lldd_dev_gone(dev);
1509         return res;
1510 }
1511
1512 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1513 {
1514         int res = 0;
1515         struct domain_device *dev;
1516
1517         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1518                 if (dev->dev_type == EDGE_DEV ||
1519                     dev->dev_type == FANOUT_DEV) {
1520                         struct sas_expander_device *ex =
1521                                 rphy_to_expander_device(dev->rphy);
1522
1523                         if (level == ex->level)
1524                                 res = sas_ex_discover_devices(dev, -1);
1525                         else if (level > 0)
1526                                 res = sas_ex_discover_devices(port->port_dev, -1);
1527
1528                 }
1529         }
1530
1531         return res;
1532 }
1533
1534 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1535 {
1536         int res;
1537         int level;
1538
1539         do {
1540                 level = port->disc.max_level;
1541                 res = sas_ex_level_discovery(port, level);
1542                 mb();
1543         } while (level < port->disc.max_level);
1544
1545         return res;
1546 }
1547
1548 int sas_discover_root_expander(struct domain_device *dev)
1549 {
1550         int res;
1551         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1552
1553         res = sas_rphy_add(dev->rphy);
1554         if (res)
1555                 goto out_err;
1556
1557         ex->level = dev->port->disc.max_level; /* 0 */
1558         res = sas_discover_expander(dev);
1559         if (res)
1560                 goto out_err2;
1561
1562         sas_ex_bfs_disc(dev->port);
1563
1564         return res;
1565
1566 out_err2:
1567         sas_rphy_remove(dev->rphy);
1568 out_err:
1569         return res;
1570 }
1571
1572 /* ---------- Domain revalidation ---------- */
1573
1574 static int sas_get_phy_discover(struct domain_device *dev,
1575                                 int phy_id, struct smp_resp *disc_resp)
1576 {
1577         int res;
1578         u8 *disc_req;
1579
1580         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1581         if (!disc_req)
1582                 return -ENOMEM;
1583
1584         disc_req[1] = SMP_DISCOVER;
1585         disc_req[9] = phy_id;
1586
1587         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1588                                disc_resp, DISCOVER_RESP_SIZE);
1589         if (res)
1590                 goto out;
1591         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1592                 res = disc_resp->result;
1593                 goto out;
1594         }
1595 out:
1596         kfree(disc_req);
1597         return res;
1598 }
1599
1600 static int sas_get_phy_change_count(struct domain_device *dev,
1601                                     int phy_id, int *pcc)
1602 {
1603         int res;
1604         struct smp_resp *disc_resp;
1605
1606         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1607         if (!disc_resp)
1608                 return -ENOMEM;
1609
1610         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1611         if (!res)
1612                 *pcc = disc_resp->disc.change_count;
1613
1614         kfree(disc_resp);
1615         return res;
1616 }
1617
1618 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1619                                          int phy_id, u8 *attached_sas_addr)
1620 {
1621         int res;
1622         struct smp_resp *disc_resp;
1623         struct discover_resp *dr;
1624
1625         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1626         if (!disc_resp)
1627                 return -ENOMEM;
1628         dr = &disc_resp->disc;
1629
1630         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1631         if (!res) {
1632                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1633                 if (dr->attached_dev_type == 0)
1634                         memset(attached_sas_addr, 0, 8);
1635         }
1636         kfree(disc_resp);
1637         return res;
1638 }
1639
1640 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1641                               int from_phy, bool update)
1642 {
1643         struct expander_device *ex = &dev->ex_dev;
1644         int res = 0;
1645         int i;
1646
1647         for (i = from_phy; i < ex->num_phys; i++) {
1648                 int phy_change_count = 0;
1649
1650                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1651                 switch (res) {
1652                 case SMP_RESP_PHY_VACANT:
1653                 case SMP_RESP_NO_PHY:
1654                         continue;
1655                 case SMP_RESP_FUNC_ACC:
1656                         break;
1657                 default:
1658                         return res;
1659                 }
1660
1661                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1662                         if (update)
1663                                 ex->ex_phy[i].phy_change_count =
1664                                         phy_change_count;
1665                         *phy_id = i;
1666                         return 0;
1667                 }
1668         }
1669         return 0;
1670 }
1671
1672 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1673 {
1674         int res;
1675         u8  *rg_req;
1676         struct smp_resp  *rg_resp;
1677
1678         rg_req = alloc_smp_req(RG_REQ_SIZE);
1679         if (!rg_req)
1680                 return -ENOMEM;
1681
1682         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1683         if (!rg_resp) {
1684                 kfree(rg_req);
1685                 return -ENOMEM;
1686         }
1687
1688         rg_req[1] = SMP_REPORT_GENERAL;
1689
1690         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1691                                RG_RESP_SIZE);
1692         if (res)
1693                 goto out;
1694         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1695                 res = rg_resp->result;
1696                 goto out;
1697         }
1698
1699         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1700 out:
1701         kfree(rg_resp);
1702         kfree(rg_req);
1703         return res;
1704 }
1705 /**
1706  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1707  * @dev:domain device to be detect.
1708  * @src_dev: the device which originated BROADCAST(CHANGE).
1709  *
1710  * Add self-configuration expander suport. Suppose two expander cascading,
1711  * when the first level expander is self-configuring, hotplug the disks in
1712  * second level expander, BROADCAST(CHANGE) will not only be originated
1713  * in the second level expander, but also be originated in the first level
1714  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1715  * expander changed count in two level expanders will all increment at least
1716  * once, but the phy which chang count has changed is the source device which
1717  * we concerned.
1718  */
1719
1720 static int sas_find_bcast_dev(struct domain_device *dev,
1721                               struct domain_device **src_dev)
1722 {
1723         struct expander_device *ex = &dev->ex_dev;
1724         int ex_change_count = -1;
1725         int phy_id = -1;
1726         int res;
1727         struct domain_device *ch;
1728
1729         res = sas_get_ex_change_count(dev, &ex_change_count);
1730         if (res)
1731                 goto out;
1732         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1733                 /* Just detect if this expander phys phy change count changed,
1734                 * in order to determine if this expander originate BROADCAST,
1735                 * and do not update phy change count field in our structure.
1736                 */
1737                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1738                 if (phy_id != -1) {
1739                         *src_dev = dev;
1740                         ex->ex_change_count = ex_change_count;
1741                         SAS_DPRINTK("Expander phy change count has changed\n");
1742                         return res;
1743                 } else
1744                         SAS_DPRINTK("Expander phys DID NOT change\n");
1745         }
1746         list_for_each_entry(ch, &ex->children, siblings) {
1747                 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1748                         res = sas_find_bcast_dev(ch, src_dev);
1749                         if (*src_dev)
1750                                 return res;
1751                 }
1752         }
1753 out:
1754         return res;
1755 }
1756
1757 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1758 {
1759         struct expander_device *ex = &dev->ex_dev;
1760         struct domain_device *child, *n;
1761
1762         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1763                 child->gone = 1;
1764                 if (child->dev_type == EDGE_DEV ||
1765                     child->dev_type == FANOUT_DEV)
1766                         sas_unregister_ex_tree(port, child);
1767                 else
1768                         sas_unregister_dev(port, child);
1769         }
1770         sas_unregister_dev(port, dev);
1771 }
1772
1773 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1774                                          int phy_id, bool last)
1775 {
1776         struct expander_device *ex_dev = &parent->ex_dev;
1777         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1778         struct domain_device *child, *n;
1779         if (last) {
1780                 list_for_each_entry_safe(child, n,
1781                         &ex_dev->children, siblings) {
1782                         if (SAS_ADDR(child->sas_addr) ==
1783                             SAS_ADDR(phy->attached_sas_addr)) {
1784                                 child->gone = 1;
1785                                 if (child->dev_type == EDGE_DEV ||
1786                                     child->dev_type == FANOUT_DEV)
1787                                         sas_unregister_ex_tree(parent->port, child);
1788                                 else
1789                                         sas_unregister_dev(parent->port, child);
1790                                 break;
1791                         }
1792                 }
1793                 parent->gone = 1;
1794                 sas_disable_routing(parent, phy->attached_sas_addr);
1795         }
1796         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1797         if (phy->port) {
1798                 sas_port_delete_phy(phy->port, phy->phy);
1799                 if (phy->port->num_phys == 0)
1800                         sas_port_delete(phy->port);
1801                 phy->port = NULL;
1802         }
1803 }
1804
1805 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1806                                           const int level)
1807 {
1808         struct expander_device *ex_root = &root->ex_dev;
1809         struct domain_device *child;
1810         int res = 0;
1811
1812         list_for_each_entry(child, &ex_root->children, siblings) {
1813                 if (child->dev_type == EDGE_DEV ||
1814                     child->dev_type == FANOUT_DEV) {
1815                         struct sas_expander_device *ex =
1816                                 rphy_to_expander_device(child->rphy);
1817
1818                         if (level > ex->level)
1819                                 res = sas_discover_bfs_by_root_level(child,
1820                                                                      level);
1821                         else if (level == ex->level)
1822                                 res = sas_ex_discover_devices(child, -1);
1823                 }
1824         }
1825         return res;
1826 }
1827
1828 static int sas_discover_bfs_by_root(struct domain_device *dev)
1829 {
1830         int res;
1831         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1832         int level = ex->level+1;
1833
1834         res = sas_ex_discover_devices(dev, -1);
1835         if (res)
1836                 goto out;
1837         do {
1838                 res = sas_discover_bfs_by_root_level(dev, level);
1839                 mb();
1840                 level += 1;
1841         } while (level <= dev->port->disc.max_level);
1842 out:
1843         return res;
1844 }
1845
1846 static int sas_discover_new(struct domain_device *dev, int phy_id)
1847 {
1848         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1849         struct domain_device *child;
1850         int res;
1851
1852         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1853                     SAS_ADDR(dev->sas_addr), phy_id);
1854         res = sas_ex_phy_discover(dev, phy_id);
1855         if (res)
1856                 return res;
1857
1858         if (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                 return res;
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         return res;
1874 }
1875
1876 static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
1877 {
1878         struct expander_device *ex = &dev->ex_dev;
1879         struct ex_phy *phy = &ex->ex_phy[phy_id];
1880         u8 attached_sas_addr[8];
1881         int res;
1882
1883         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1884         switch (res) {
1885         case SMP_RESP_NO_PHY:
1886                 phy->phy_state = PHY_NOT_PRESENT;
1887                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1888                 goto out; break;
1889         case SMP_RESP_PHY_VACANT:
1890                 phy->phy_state = PHY_VACANT;
1891                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1892                 goto out; break;
1893         case SMP_RESP_FUNC_ACC:
1894                 break;
1895         }
1896
1897         if (SAS_ADDR(attached_sas_addr) == 0) {
1898                 phy->phy_state = PHY_EMPTY;
1899                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1900         } else if (SAS_ADDR(attached_sas_addr) ==
1901                    SAS_ADDR(phy->attached_sas_addr)) {
1902                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1903                             SAS_ADDR(dev->sas_addr), phy_id);
1904                 sas_ex_phy_discover(dev, phy_id);
1905         } else
1906                 res = sas_discover_new(dev, phy_id);
1907 out:
1908         return res;
1909 }
1910
1911 /**
1912  * sas_rediscover - revalidate the domain.
1913  * @dev:domain device to be detect.
1914  * @phy_id: the phy id will be detected.
1915  *
1916  * NOTE: this process _must_ quit (return) as soon as any connection
1917  * errors are encountered.  Connection recovery is done elsewhere.
1918  * Discover process only interrogates devices in order to discover the
1919  * domain.For plugging out, we un-register the device only when it is
1920  * the last phy in the port, for other phys in this port, we just delete it
1921  * from the port.For inserting, we do discovery when it is the
1922  * first phy,for other phys in this port, we add it to the port to
1923  * forming the wide-port.
1924  */
1925 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1926 {
1927         struct expander_device *ex = &dev->ex_dev;
1928         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1929         int res = 0;
1930         int i;
1931         bool last = true;       /* is this the last phy of the port */
1932
1933         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1934                     SAS_ADDR(dev->sas_addr), phy_id);
1935
1936         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1937                 for (i = 0; i < ex->num_phys; i++) {
1938                         struct ex_phy *phy = &ex->ex_phy[i];
1939
1940                         if (i == phy_id)
1941                                 continue;
1942                         if (SAS_ADDR(phy->attached_sas_addr) ==
1943                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1944                                 SAS_DPRINTK("phy%d part of wide port with "
1945                                             "phy%d\n", phy_id, i);
1946                                 last = false;
1947                                 break;
1948                         }
1949                 }
1950                 res = sas_rediscover_dev(dev, phy_id, last);
1951         } else
1952                 res = sas_discover_new(dev, phy_id);
1953         return res;
1954 }
1955
1956 /**
1957  * sas_revalidate_domain -- revalidate the domain
1958  * @port: port to the domain of interest
1959  *
1960  * NOTE: this process _must_ quit (return) as soon as any connection
1961  * errors are encountered.  Connection recovery is done elsewhere.
1962  * Discover process only interrogates devices in order to discover the
1963  * domain.
1964  */
1965 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1966 {
1967         int res;
1968         struct domain_device *dev = NULL;
1969
1970         res = sas_find_bcast_dev(port_dev, &dev);
1971         while (res == 0 && dev) {
1972                 struct expander_device *ex = &dev->ex_dev;
1973                 int i = 0, phy_id;
1974
1975                 do {
1976                         phy_id = -1;
1977                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
1978                         if (phy_id == -1)
1979                                 break;
1980                         res = sas_rediscover(dev, phy_id);
1981                         i = phy_id + 1;
1982                 } while (i < ex->num_phys);
1983
1984                 dev = NULL;
1985                 res = sas_find_bcast_dev(port_dev, &dev);
1986         }
1987         return res;
1988 }
1989
1990 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1991                     struct request *req)
1992 {
1993         struct domain_device *dev;
1994         int ret, type;
1995         struct request *rsp = req->next_rq;
1996
1997         if (!rsp) {
1998                 printk("%s: space for a smp response is missing\n",
1999                        __func__);
2000                 return -EINVAL;
2001         }
2002
2003         /* no rphy means no smp target support (ie aic94xx host) */
2004         if (!rphy)
2005                 return sas_smp_host_handler(shost, req, rsp);
2006
2007         type = rphy->identify.device_type;
2008
2009         if (type != SAS_EDGE_EXPANDER_DEVICE &&
2010             type != SAS_FANOUT_EXPANDER_DEVICE) {
2011                 printk("%s: can we send a smp request to a device?\n",
2012                        __func__);
2013                 return -EINVAL;
2014         }
2015
2016         dev = sas_find_dev_by_rphy(rphy);
2017         if (!dev) {
2018                 printk("%s: fail to find a domain_device?\n", __func__);
2019                 return -EINVAL;
2020         }
2021
2022         /* do we need to support multiple segments? */
2023         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2024                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
2025                        __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2026                        rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
2027                 return -EINVAL;
2028         }
2029
2030         ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2031                                bio_data(rsp->bio), blk_rq_bytes(rsp));
2032         if (ret > 0) {
2033                 /* positive number is the untransferred residual */
2034                 rsp->resid_len = ret;
2035                 req->resid_len = 0;
2036                 ret = 0;
2037         } else if (ret == 0) {
2038                 rsp->resid_len = 0;
2039                 req->resid_len = 0;
2040         }
2041
2042         return ret;
2043 }