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 int 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 0;
 794                 }
 795         }
 796
 797         return -ENODEV;
 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         res = sas_ex_join_wide_port(dev, phy_id);
 936         if (!res) {
 937                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 938                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 939                 return res;
 940         }
 941
 942         switch (ex_phy->attached_dev_type) {
 943         case SAS_END_DEV:
 944                 child = sas_ex_discover_end_dev(dev, phy_id);
 945                 break;
 946         case FANOUT_DEV:
 947                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 948                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 949                                     "attached to ex %016llx phy 0x%x\n",
 950                                     SAS_ADDR(ex_phy->attached_sas_addr),
 951                                     ex_phy->attached_phy_id,
 952                                     SAS_ADDR(dev->sas_addr),
 953                                     phy_id);
 954                         sas_ex_disable_phy(dev, phy_id);
 955                         break;
 956                 } else
 957                         memcpy(dev->port->disc.fanout_sas_addr,
 958                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 959                 /* fallthrough */
 960         case EDGE_DEV:
 961                 child = sas_ex_discover_expander(dev, phy_id);
 962                 break;
 963         default:
 964                 break;
 965         }
 966
 967         if (child) {
 968                 int i;
 969
 970                 for (i = 0; i < ex->num_phys; i++) {
 971                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 972                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 973                                 continue;
 974                         /*
 975                          * Due to races, the phy might not get added to the
 976                          * wide port, so we add the phy to the wide port here.
 977                          */
 978                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 979                             SAS_ADDR(child->sas_addr)) {
 980                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 981                                 res = sas_ex_join_wide_port(dev, i);
 982                                 if (!res)
 983                                         SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 984                                                     i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
 985
 986                         }
 987                 }
 988         }
 989
 990         return res;
 991 }
 992
 993 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 994 {
 995         struct expander_device *ex = &dev->ex_dev;
 996         int i;
 997
 998         for (i = 0; i < ex->num_phys; i++) {
 999                 struct ex_phy *phy = &ex->ex_phy[i];
1000
1001                 if (phy->phy_state == PHY_VACANT ||
1002                     phy->phy_state == PHY_NOT_PRESENT)
1003                         continue;
1004
1005                 if ((phy->attached_dev_type == EDGE_DEV ||
1006                      phy->attached_dev_type == FANOUT_DEV) &&
1007                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1008
1009                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1010
1011                         return 1;
1012                 }
1013         }
1014         return 0;
1015 }
1016
1017 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1018 {
1019         struct expander_device *ex = &dev->ex_dev;
1020         struct domain_device *child;
1021         u8 sub_addr[8] = {0, };
1022
1023         list_for_each_entry(child, &ex->children, siblings) {
1024                 if (child->dev_type != EDGE_DEV &&
1025                     child->dev_type != FANOUT_DEV)
1026                         continue;
1027                 if (sub_addr[0] == 0) {
1028                         sas_find_sub_addr(child, sub_addr);
1029                         continue;
1030                 } else {
1031                         u8 s2[8];
1032
1033                         if (sas_find_sub_addr(child, s2) &&
1034                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1035
1036                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1037                                             "diverges from subtractive "
1038                                             "boundary %016llx\n",
1039                                             SAS_ADDR(dev->sas_addr),
1040                                             SAS_ADDR(child->sas_addr),
1041                                             SAS_ADDR(s2),
1042                                             SAS_ADDR(sub_addr));
1043
1044                                 sas_ex_disable_port(child, s2);
1045                         }
1046                 }
1047         }
1048         return 0;
1049 }
1050 /**
1051  * sas_ex_discover_devices -- discover devices attached to this expander
1052  * dev: pointer to the expander domain device
1053  * single: if you want to do a single phy, else set to -1;
1054  *
1055  * Configure this expander for use with its devices and register the
1056  * devices of this expander.
1057  */
1058 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1059 {
1060         struct expander_device *ex = &dev->ex_dev;
1061         int i = 0, end = ex->num_phys;
1062         int res = 0;
1063
1064         if (0 <= single && single < end) {
1065                 i = single;
1066                 end = i+1;
1067         }
1068
1069         for ( ; i < end; i++) {
1070                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1071
1072                 if (ex_phy->phy_state == PHY_VACANT ||
1073                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1074                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1075                         continue;
1076
1077                 switch (ex_phy->linkrate) {
1078                 case SAS_PHY_DISABLED:
1079                 case SAS_PHY_RESET_PROBLEM:
1080                 case SAS_SATA_PORT_SELECTOR:
1081                         continue;
1082                 default:
1083                         res = sas_ex_discover_dev(dev, i);
1084                         if (res)
1085                                 break;
1086                         continue;
1087                 }
1088         }
1089
1090         if (!res)
1091                 sas_check_level_subtractive_boundary(dev);
1092
1093         return res;
1094 }
1095
1096 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1097 {
1098         struct expander_device *ex = &dev->ex_dev;
1099         int i;
1100         u8  *sub_sas_addr = NULL;
1101
1102         if (dev->dev_type != EDGE_DEV)
1103                 return 0;
1104
1105         for (i = 0; i < ex->num_phys; i++) {
1106                 struct ex_phy *phy = &ex->ex_phy[i];
1107
1108                 if (phy->phy_state == PHY_VACANT ||
1109                     phy->phy_state == PHY_NOT_PRESENT)
1110                         continue;
1111
1112                 if ((phy->attached_dev_type == FANOUT_DEV ||
1113                      phy->attached_dev_type == EDGE_DEV) &&
1114                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1115
1116                         if (!sub_sas_addr)
1117                                 sub_sas_addr = &phy->attached_sas_addr[0];
1118                         else if (SAS_ADDR(sub_sas_addr) !=
1119                                  SAS_ADDR(phy->attached_sas_addr)) {
1120
1121                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1122                                             "diverges(%016llx) on subtractive "
1123                                             "boundary(%016llx). Disabled\n",
1124                                             SAS_ADDR(dev->sas_addr), i,
1125                                             SAS_ADDR(phy->attached_sas_addr),
1126                                             SAS_ADDR(sub_sas_addr));
1127                                 sas_ex_disable_phy(dev, i);
1128                         }
1129                 }
1130         }
1131         return 0;
1132 }
1133
1134 static void sas_print_parent_topology_bug(struct domain_device *child,
1135                                                  struct ex_phy *parent_phy,
1136                                                  struct ex_phy *child_phy)
1137 {
1138         static const char ra_char[] = {
1139                 [DIRECT_ROUTING] = 'D',
1140                 [SUBTRACTIVE_ROUTING] = 'S',
1141                 [TABLE_ROUTING] = 'T',
1142         };
1143         static const char *ex_type[] = {
1144                 [EDGE_DEV] = "edge",
1145                 [FANOUT_DEV] = "fanout",
1146         };
1147         struct domain_device *parent = child->parent;
1148
1149         sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
1150                    "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
1151
1152                    ex_type[parent->dev_type],
1153                    SAS_ADDR(parent->sas_addr),
1154                    parent->ex_dev.t2t_supp,
1155                    parent_phy->phy_id,
1156
1157                    ex_type[child->dev_type],
1158                    SAS_ADDR(child->sas_addr),
1159                    child->ex_dev.t2t_supp,
1160                    child_phy->phy_id,
1161
1162                    ra_char[parent_phy->routing_attr],
1163                    ra_char[child_phy->routing_attr]);
1164 }
1165
1166 static int sas_check_eeds(struct domain_device *child,
1167                                  struct ex_phy *parent_phy,
1168                                  struct ex_phy *child_phy)
1169 {
1170         int res = 0;
1171         struct domain_device *parent = child->parent;
1172
1173         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1174                 res = -ENODEV;
1175                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1176                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1177                             SAS_ADDR(parent->sas_addr),
1178                             parent_phy->phy_id,
1179                             SAS_ADDR(child->sas_addr),
1180                             child_phy->phy_id,
1181                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1182         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1183                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1184                        SAS_ADDR_SIZE);
1185                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1186                        SAS_ADDR_SIZE);
1187         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1188                     SAS_ADDR(parent->sas_addr)) ||
1189                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1190                     SAS_ADDR(child->sas_addr)))
1191                    &&
1192                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1193                      SAS_ADDR(parent->sas_addr)) ||
1194                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1195                      SAS_ADDR(child->sas_addr))))
1196                 ;
1197         else {
1198                 res = -ENODEV;
1199                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1200                             "phy 0x%x link forms a third EEDS!\n",
1201                             SAS_ADDR(parent->sas_addr),
1202                             parent_phy->phy_id,
1203                             SAS_ADDR(child->sas_addr),
1204                             child_phy->phy_id);
1205         }
1206
1207         return res;
1208 }
1209
1210 /* Here we spill over 80 columns.  It is intentional.
1211  */
1212 static int sas_check_parent_topology(struct domain_device *child)
1213 {
1214         struct expander_device *child_ex = &child->ex_dev;
1215         struct expander_device *parent_ex;
1216         int i;
1217         int res = 0;
1218
1219         if (!child->parent)
1220                 return 0;
1221
1222         if (child->parent->dev_type != EDGE_DEV &&
1223             child->parent->dev_type != FANOUT_DEV)
1224                 return 0;
1225
1226         parent_ex = &child->parent->ex_dev;
1227
1228         for (i = 0; i < parent_ex->num_phys; i++) {
1229                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1230                 struct ex_phy *child_phy;
1231
1232                 if (parent_phy->phy_state == PHY_VACANT ||
1233                     parent_phy->phy_state == PHY_NOT_PRESENT)
1234                         continue;
1235
1236                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1237                         continue;
1238
1239                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1240
1241                 switch (child->parent->dev_type) {
1242                 case EDGE_DEV:
1243                         if (child->dev_type == FANOUT_DEV) {
1244                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1245                                     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 == SUBTRACTIVE_ROUTING) {
1250                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1251                                         res = sas_check_eeds(child, parent_phy, child_phy);
1252                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1253                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1254                                         res = -ENODEV;
1255                                 }
1256                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1257                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1258                                     (child_phy->routing_attr == TABLE_ROUTING &&
1259                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1260                                         /* All good */;
1261                                 } else {
1262                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1263                                         res = -ENODEV;
1264                                 }
1265                         }
1266                         break;
1267                 case FANOUT_DEV:
1268                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1269                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1270                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1271                                 res = -ENODEV;
1272                         }
1273                         break;
1274                 default:
1275                         break;
1276                 }
1277         }
1278
1279         return res;
1280 }
1281
1282 #define RRI_REQ_SIZE  16
1283 #define RRI_RESP_SIZE 44
1284
1285 static int sas_configure_present(struct domain_device *dev, int phy_id,
1286                                  u8 *sas_addr, int *index, int *present)
1287 {
1288         int i, res = 0;
1289         struct expander_device *ex = &dev->ex_dev;
1290         struct ex_phy *phy = &ex->ex_phy[phy_id];
1291         u8 *rri_req;
1292         u8 *rri_resp;
1293
1294         *present = 0;
1295         *index = 0;
1296
1297         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1298         if (!rri_req)
1299                 return -ENOMEM;
1300
1301         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1302         if (!rri_resp) {
1303                 kfree(rri_req);
1304                 return -ENOMEM;
1305         }
1306
1307         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1308         rri_req[9] = phy_id;
1309
1310         for (i = 0; i < ex->max_route_indexes ; i++) {
1311                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1312                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1313                                        RRI_RESP_SIZE);
1314                 if (res)
1315                         goto out;
1316                 res = rri_resp[2];
1317                 if (res == SMP_RESP_NO_INDEX) {
1318                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1319                                     "phy 0x%x index 0x%x\n",
1320                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1321                         goto out;
1322                 } else if (res != SMP_RESP_FUNC_ACC) {
1323                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1324                                     "result 0x%x\n", __func__,
1325                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1326                         goto out;
1327                 }
1328                 if (SAS_ADDR(sas_addr) != 0) {
1329                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1330                                 *index = i;
1331                                 if ((rri_resp[12] & 0x80) == 0x80)
1332                                         *present = 0;
1333                                 else
1334                                         *present = 1;
1335                                 goto out;
1336                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1337                                 *index = i;
1338                                 *present = 0;
1339                                 goto out;
1340                         }
1341                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1342                            phy->last_da_index < i) {
1343                         phy->last_da_index = i;
1344                         *index = i;
1345                         *present = 0;
1346                         goto out;
1347                 }
1348         }
1349         res = -1;
1350 out:
1351         kfree(rri_req);
1352         kfree(rri_resp);
1353         return res;
1354 }
1355
1356 #define CRI_REQ_SIZE  44
1357 #define CRI_RESP_SIZE  8
1358
1359 static int sas_configure_set(struct domain_device *dev, int phy_id,
1360                              u8 *sas_addr, int index, int include)
1361 {
1362         int res;
1363         u8 *cri_req;
1364         u8 *cri_resp;
1365
1366         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1367         if (!cri_req)
1368                 return -ENOMEM;
1369
1370         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1371         if (!cri_resp) {
1372                 kfree(cri_req);
1373                 return -ENOMEM;
1374         }
1375
1376         cri_req[1] = SMP_CONF_ROUTE_INFO;
1377         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1378         cri_req[9] = phy_id;
1379         if (SAS_ADDR(sas_addr) == 0 || !include)
1380                 cri_req[12] |= 0x80;
1381         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1382
1383         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1384                                CRI_RESP_SIZE);
1385         if (res)
1386                 goto out;
1387         res = cri_resp[2];
1388         if (res == SMP_RESP_NO_INDEX) {
1389                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1390                             "index 0x%x\n",
1391                             SAS_ADDR(dev->sas_addr), phy_id, index);
1392         }
1393 out:
1394         kfree(cri_req);
1395         kfree(cri_resp);
1396         return res;
1397 }
1398
1399 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1400                                     u8 *sas_addr, int include)
1401 {
1402         int index;
1403         int present;
1404         int res;
1405
1406         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1407         if (res)
1408                 return res;
1409         if (include ^ present)
1410                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1411
1412         return res;
1413 }
1414
1415 /**
1416  * sas_configure_parent -- configure routing table of parent
1417  * parent: parent expander
1418  * child: child expander
1419  * sas_addr: SAS port identifier of device directly attached to child
1420  */
1421 static int sas_configure_parent(struct domain_device *parent,
1422                                 struct domain_device *child,
1423                                 u8 *sas_addr, int include)
1424 {
1425         struct expander_device *ex_parent = &parent->ex_dev;
1426         int res = 0;
1427         int i;
1428
1429         if (parent->parent) {
1430                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1431                                            include);
1432                 if (res)
1433                         return res;
1434         }
1435
1436         if (ex_parent->conf_route_table == 0) {
1437                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1438                             SAS_ADDR(parent->sas_addr));
1439                 return 0;
1440         }
1441
1442         for (i = 0; i < ex_parent->num_phys; i++) {
1443                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1444
1445                 if ((phy->routing_attr == TABLE_ROUTING) &&
1446                     (SAS_ADDR(phy->attached_sas_addr) ==
1447                      SAS_ADDR(child->sas_addr))) {
1448                         res = sas_configure_phy(parent, i, sas_addr, include);
1449                         if (res)
1450                                 return res;
1451                 }
1452         }
1453
1454         return res;
1455 }
1456
1457 /**
1458  * sas_configure_routing -- configure routing
1459  * dev: expander device
1460  * sas_addr: port identifier of device directly attached to the expander device
1461  */
1462 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1463 {
1464         if (dev->parent)
1465                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1466         return 0;
1467 }
1468
1469 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1470 {
1471         if (dev->parent)
1472                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1473         return 0;
1474 }
1475
1476 /**
1477  * sas_discover_expander -- expander discovery
1478  * @ex: pointer to expander domain device
1479  *
1480  * See comment in sas_discover_sata().
1481  */
1482 static int sas_discover_expander(struct domain_device *dev)
1483 {
1484         int res;
1485
1486         res = sas_notify_lldd_dev_found(dev);
1487         if (res)
1488                 return res;
1489
1490         res = sas_ex_general(dev);
1491         if (res)
1492                 goto out_err;
1493         res = sas_ex_manuf_info(dev);
1494         if (res)
1495                 goto out_err;
1496
1497         res = sas_expander_discover(dev);
1498         if (res) {
1499                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1500                             SAS_ADDR(dev->sas_addr), res);
1501                 goto out_err;
1502         }
1503
1504         sas_check_ex_subtractive_boundary(dev);
1505         res = sas_check_parent_topology(dev);
1506         if (res)
1507                 goto out_err;
1508         return 0;
1509 out_err:
1510         sas_notify_lldd_dev_gone(dev);
1511         return res;
1512 }
1513
1514 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1515 {
1516         int res = 0;
1517         struct domain_device *dev;
1518
1519         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1520                 if (dev->dev_type == EDGE_DEV ||
1521                     dev->dev_type == FANOUT_DEV) {
1522                         struct sas_expander_device *ex =
1523                                 rphy_to_expander_device(dev->rphy);
1524
1525                         if (level == ex->level)
1526                                 res = sas_ex_discover_devices(dev, -1);
1527                         else if (level > 0)
1528                                 res = sas_ex_discover_devices(port->port_dev, -1);
1529
1530                 }
1531         }
1532
1533         return res;
1534 }
1535
1536 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1537 {
1538         int res;
1539         int level;
1540
1541         do {
1542                 level = port->disc.max_level;
1543                 res = sas_ex_level_discovery(port, level);
1544                 mb();
1545         } while (level < port->disc.max_level);
1546
1547         return res;
1548 }
1549
1550 int sas_discover_root_expander(struct domain_device *dev)
1551 {
1552         int res;
1553         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1554
1555         res = sas_rphy_add(dev->rphy);
1556         if (res)
1557                 goto out_err;
1558
1559         ex->level = dev->port->disc.max_level; /* 0 */
1560         res = sas_discover_expander(dev);
1561         if (res)
1562                 goto out_err2;
1563
1564         sas_ex_bfs_disc(dev->port);
1565
1566         return res;
1567
1568 out_err2:
1569         sas_rphy_remove(dev->rphy);
1570 out_err:
1571         return res;
1572 }
1573
1574 /* ---------- Domain revalidation ---------- */
1575
1576 static int sas_get_phy_discover(struct domain_device *dev,
1577                                 int phy_id, struct smp_resp *disc_resp)
1578 {
1579         int res;
1580         u8 *disc_req;
1581
1582         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1583         if (!disc_req)
1584                 return -ENOMEM;
1585
1586         disc_req[1] = SMP_DISCOVER;
1587         disc_req[9] = phy_id;
1588
1589         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1590                                disc_resp, DISCOVER_RESP_SIZE);
1591         if (res)
1592                 goto out;
1593         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1594                 res = disc_resp->result;
1595                 goto out;
1596         }
1597 out:
1598         kfree(disc_req);
1599         return res;
1600 }
1601
1602 static int sas_get_phy_change_count(struct domain_device *dev,
1603                                     int phy_id, int *pcc)
1604 {
1605         int res;
1606         struct smp_resp *disc_resp;
1607
1608         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1609         if (!disc_resp)
1610                 return -ENOMEM;
1611
1612         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1613         if (!res)
1614                 *pcc = disc_resp->disc.change_count;
1615
1616         kfree(disc_resp);
1617         return res;
1618 }
1619
1620 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1621                                          int phy_id, u8 *attached_sas_addr)
1622 {
1623         int res;
1624         struct smp_resp *disc_resp;
1625         struct discover_resp *dr;
1626
1627         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1628         if (!disc_resp)
1629                 return -ENOMEM;
1630         dr = &disc_resp->disc;
1631
1632         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1633         if (!res) {
1634                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1635                 if (dr->attached_dev_type == 0)
1636                         memset(attached_sas_addr, 0, 8);
1637         }
1638         kfree(disc_resp);
1639         return res;
1640 }
1641
1642 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1643                               int from_phy, bool update)
1644 {
1645         struct expander_device *ex = &dev->ex_dev;
1646         int res = 0;
1647         int i;
1648
1649         for (i = from_phy; i < ex->num_phys; i++) {
1650                 int phy_change_count = 0;
1651
1652                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1653                 switch (res) {
1654                 case SMP_RESP_PHY_VACANT:
1655                 case SMP_RESP_NO_PHY:
1656                         continue;
1657                 case SMP_RESP_FUNC_ACC:
1658                         break;
1659                 default:
1660                         return res;
1661                 }
1662
1663                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1664                         if (update)
1665                                 ex->ex_phy[i].phy_change_count =
1666                                         phy_change_count;
1667                         *phy_id = i;
1668                         return 0;
1669                 }
1670         }
1671         return 0;
1672 }
1673
1674 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1675 {
1676         int res;
1677         u8  *rg_req;
1678         struct smp_resp  *rg_resp;
1679
1680         rg_req = alloc_smp_req(RG_REQ_SIZE);
1681         if (!rg_req)
1682                 return -ENOMEM;
1683
1684         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1685         if (!rg_resp) {
1686                 kfree(rg_req);
1687                 return -ENOMEM;
1688         }
1689
1690         rg_req[1] = SMP_REPORT_GENERAL;
1691
1692         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1693                                RG_RESP_SIZE);
1694         if (res)
1695                 goto out;
1696         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1697                 res = rg_resp->result;
1698                 goto out;
1699         }
1700
1701         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1702 out:
1703         kfree(rg_resp);
1704         kfree(rg_req);
1705         return res;
1706 }
1707 /**
1708  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1709  * @dev:domain device to be detect.
1710  * @src_dev: the device which originated BROADCAST(CHANGE).
1711  *
1712  * Add self-configuration expander suport. Suppose two expander cascading,
1713  * when the first level expander is self-configuring, hotplug the disks in
1714  * second level expander, BROADCAST(CHANGE) will not only be originated
1715  * in the second level expander, but also be originated in the first level
1716  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1717  * expander changed count in two level expanders will all increment at least
1718  * once, but the phy which chang count has changed is the source device which
1719  * we concerned.
1720  */
1721
1722 static int sas_find_bcast_dev(struct domain_device *dev,
1723                               struct domain_device **src_dev)
1724 {
1725         struct expander_device *ex = &dev->ex_dev;
1726         int ex_change_count = -1;
1727         int phy_id = -1;
1728         int res;
1729         struct domain_device *ch;
1730
1731         res = sas_get_ex_change_count(dev, &ex_change_count);
1732         if (res)
1733                 goto out;
1734         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1735                 /* Just detect if this expander phys phy change count changed,
1736                 * in order to determine if this expander originate BROADCAST,
1737                 * and do not update phy change count field in our structure.
1738                 */
1739                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1740                 if (phy_id != -1) {
1741                         *src_dev = dev;
1742                         ex->ex_change_count = ex_change_count;
1743                         SAS_DPRINTK("Expander phy change count has changed\n");
1744                         return res;
1745                 } else
1746                         SAS_DPRINTK("Expander phys DID NOT change\n");
1747         }
1748         list_for_each_entry(ch, &ex->children, siblings) {
1749                 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1750                         res = sas_find_bcast_dev(ch, src_dev);
1751                         if (*src_dev)
1752                                 return res;
1753                 }
1754         }
1755 out:
1756         return res;
1757 }
1758
1759 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1760 {
1761         struct expander_device *ex = &dev->ex_dev;
1762         struct domain_device *child, *n;
1763
1764         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1765                 child->gone = 1;
1766                 if (child->dev_type == EDGE_DEV ||
1767                     child->dev_type == FANOUT_DEV)
1768                         sas_unregister_ex_tree(port, child);
1769                 else
1770                         sas_unregister_dev(port, child);
1771         }
1772         sas_unregister_dev(port, dev);
1773 }
1774
1775 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1776                                          int phy_id, bool last)
1777 {
1778         struct expander_device *ex_dev = &parent->ex_dev;
1779         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1780         struct domain_device *child, *n;
1781         if (last) {
1782                 list_for_each_entry_safe(child, n,
1783                         &ex_dev->children, siblings) {
1784                         if (SAS_ADDR(child->sas_addr) ==
1785                             SAS_ADDR(phy->attached_sas_addr)) {
1786                                 child->gone = 1;
1787                                 if (child->dev_type == EDGE_DEV ||
1788                                     child->dev_type == FANOUT_DEV)
1789                                         sas_unregister_ex_tree(parent->port, child);
1790                                 else
1791                                         sas_unregister_dev(parent->port, child);
1792                                 break;
1793                         }
1794                 }
1795                 parent->gone = 1;
1796                 sas_disable_routing(parent, phy->attached_sas_addr);
1797         }
1798         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1799         if (phy->port) {
1800                 sas_port_delete_phy(phy->port, phy->phy);
1801                 if (phy->port->num_phys == 0)
1802                         sas_port_delete(phy->port);
1803                 phy->port = NULL;
1804         }
1805 }
1806
1807 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1808                                           const int level)
1809 {
1810         struct expander_device *ex_root = &root->ex_dev;
1811         struct domain_device *child;
1812         int res = 0;
1813
1814         list_for_each_entry(child, &ex_root->children, siblings) {
1815                 if (child->dev_type == EDGE_DEV ||
1816                     child->dev_type == FANOUT_DEV) {
1817                         struct sas_expander_device *ex =
1818                                 rphy_to_expander_device(child->rphy);
1819
1820                         if (level > ex->level)
1821                                 res = sas_discover_bfs_by_root_level(child,
1822                                                                      level);
1823                         else if (level == ex->level)
1824                                 res = sas_ex_discover_devices(child, -1);
1825                 }
1826         }
1827         return res;
1828 }
1829
1830 static int sas_discover_bfs_by_root(struct domain_device *dev)
1831 {
1832         int res;
1833         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1834         int level = ex->level+1;
1835
1836         res = sas_ex_discover_devices(dev, -1);
1837         if (res)
1838                 goto out;
1839         do {
1840                 res = sas_discover_bfs_by_root_level(dev, level);
1841                 mb();
1842                 level += 1;
1843         } while (level <= dev->port->disc.max_level);
1844 out:
1845         return res;
1846 }
1847
1848 static int sas_discover_new(struct domain_device *dev, int phy_id)
1849 {
1850         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1851         struct domain_device *child;
1852         bool found = false;
1853         int res, i;
1854
1855         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1856                     SAS_ADDR(dev->sas_addr), phy_id);
1857         res = sas_ex_phy_discover(dev, phy_id);
1858         if (res)
1859                 goto out;
1860         /* to support the wide port inserted */
1861         for (i = 0; i < dev->ex_dev.num_phys; i++) {
1862                 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i];
1863                 if (i == phy_id)
1864                         continue;
1865                 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) ==
1866                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1867                         found = true;
1868                         break;
1869                 }
1870         }
1871         if (found) {
1872                 sas_ex_join_wide_port(dev, phy_id);
1873                 return 0;
1874         }
1875         res = sas_ex_discover_devices(dev, phy_id);
1876         if (!res)
1877                 goto out;
1878         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1879                 if (SAS_ADDR(child->sas_addr) ==
1880                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1881                         if (child->dev_type == EDGE_DEV ||
1882                             child->dev_type == FANOUT_DEV)
1883                                 res = sas_discover_bfs_by_root(child);
1884                         break;
1885                 }
1886         }
1887 out:
1888         return res;
1889 }
1890
1891 static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
1892 {
1893         struct expander_device *ex = &dev->ex_dev;
1894         struct ex_phy *phy = &ex->ex_phy[phy_id];
1895         u8 attached_sas_addr[8];
1896         int res;
1897
1898         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1899         switch (res) {
1900         case SMP_RESP_NO_PHY:
1901                 phy->phy_state = PHY_NOT_PRESENT;
1902                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1903                 goto out; break;
1904         case SMP_RESP_PHY_VACANT:
1905                 phy->phy_state = PHY_VACANT;
1906                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1907                 goto out; break;
1908         case SMP_RESP_FUNC_ACC:
1909                 break;
1910         }
1911
1912         if (SAS_ADDR(attached_sas_addr) == 0) {
1913                 phy->phy_state = PHY_EMPTY;
1914                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1915         } else if (SAS_ADDR(attached_sas_addr) ==
1916                    SAS_ADDR(phy->attached_sas_addr)) {
1917                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1918                             SAS_ADDR(dev->sas_addr), phy_id);
1919                 sas_ex_phy_discover(dev, phy_id);
1920         } else
1921                 res = sas_discover_new(dev, phy_id);
1922 out:
1923         return res;
1924 }
1925
1926 /**
1927  * sas_rediscover - revalidate the domain.
1928  * @dev:domain device to be detect.
1929  * @phy_id: the phy id will be detected.
1930  *
1931  * NOTE: this process _must_ quit (return) as soon as any connection
1932  * errors are encountered.  Connection recovery is done elsewhere.
1933  * Discover process only interrogates devices in order to discover the
1934  * domain.For plugging out, we un-register the device only when it is
1935  * the last phy in the port, for other phys in this port, we just delete it
1936  * from the port.For inserting, we do discovery when it is the
1937  * first phy,for other phys in this port, we add it to the port to
1938  * forming the wide-port.
1939  */
1940 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1941 {
1942         struct expander_device *ex = &dev->ex_dev;
1943         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1944         int res = 0;
1945         int i;
1946         bool last = true;       /* is this the last phy of the port */
1947
1948         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1949                     SAS_ADDR(dev->sas_addr), phy_id);
1950
1951         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1952                 for (i = 0; i < ex->num_phys; i++) {
1953                         struct ex_phy *phy = &ex->ex_phy[i];
1954
1955                         if (i == phy_id)
1956                                 continue;
1957                         if (SAS_ADDR(phy->attached_sas_addr) ==
1958                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1959                                 SAS_DPRINTK("phy%d part of wide port with "
1960                                             "phy%d\n", phy_id, i);
1961                                 last = false;
1962                                 break;
1963                         }
1964                 }
1965                 res = sas_rediscover_dev(dev, phy_id, last);
1966         } else
1967                 res = sas_discover_new(dev, phy_id);
1968         return res;
1969 }
1970
1971 /**
1972  * sas_revalidate_domain -- revalidate the domain
1973  * @port: port to the domain of interest
1974  *
1975  * NOTE: this process _must_ quit (return) as soon as any connection
1976  * errors are encountered.  Connection recovery is done elsewhere.
1977  * Discover process only interrogates devices in order to discover the
1978  * domain.
1979  */
1980 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1981 {
1982         int res;
1983         struct domain_device *dev = NULL;
1984
1985         res = sas_find_bcast_dev(port_dev, &dev);
1986         if (res)
1987                 goto out;
1988         if (dev) {
1989                 struct expander_device *ex = &dev->ex_dev;
1990                 int i = 0, phy_id;
1991
1992                 do {
1993                         phy_id = -1;
1994                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
1995                         if (phy_id == -1)
1996                                 break;
1997                         res = sas_rediscover(dev, phy_id);
1998                         i = phy_id + 1;
1999                 } while (i < ex->num_phys);
2000         }
2001 out:
2002         return res;
2003 }
2004
2005 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
2006                     struct request *req)
2007 {
2008         struct domain_device *dev;
2009         int ret, type;
2010         struct request *rsp = req->next_rq;
2011
2012         if (!rsp) {
2013                 printk("%s: space for a smp response is missing\n",
2014                        __func__);
2015                 return -EINVAL;
2016         }
2017
2018         /* no rphy means no smp target support (ie aic94xx host) */
2019         if (!rphy)
2020                 return sas_smp_host_handler(shost, req, rsp);
2021
2022         type = rphy->identify.device_type;
2023
2024         if (type != SAS_EDGE_EXPANDER_DEVICE &&
2025             type != SAS_FANOUT_EXPANDER_DEVICE) {
2026                 printk("%s: can we send a smp request to a device?\n",
2027                        __func__);
2028                 return -EINVAL;
2029         }
2030
2031         dev = sas_find_dev_by_rphy(rphy);
2032         if (!dev) {
2033                 printk("%s: fail to find a domain_device?\n", __func__);
2034                 return -EINVAL;
2035         }
2036
2037         /* do we need to support multiple segments? */
2038         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2039                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
2040                        __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2041                        rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
2042                 return -EINVAL;
2043         }
2044
2045         ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2046                                bio_data(rsp->bio), blk_rq_bytes(rsp));
2047         if (ret > 0) {
2048                 /* positive number is the untransferred residual */
2049                 rsp->resid_len = ret;
2050                 req->resid_len = 0;
2051                 ret = 0;
2052         } else if (ret == 0) {
2053                 rsp->resid_len = 0;
2054                 req->resid_len = 0;
2055         }
2056
2057         return ret;
2058 }