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(req);
 570         kfree(resp);
 571         return res;
 572
 573 }
 574
 575 #ifdef CONFIG_SCSI_SAS_ATA
 576
 577 #define RPS_REQ_SIZE  16
 578 #define RPS_RESP_SIZE 60
 579
 580 static int sas_get_report_phy_sata(struct domain_device *dev,
 581                                           int phy_id,
 582                                           struct smp_resp *rps_resp)
 583 {
 584         int res;
 585         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 586         u8 *resp = (u8 *)rps_resp;
 587
 588         if (!rps_req)
 589                 return -ENOMEM;
 590
 591         rps_req[1] = SMP_REPORT_PHY_SATA;
 592         rps_req[9] = phy_id;
 593
 594         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 595                                     rps_resp, RPS_RESP_SIZE);
 596
 597         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 598          * standards cockup here.  sas-2 explicitly specifies the FIS
 599          * should be encoded so that FIS type is in resp[24].
 600          * However, some expanders endian reverse this.  Undo the
 601          * reversal here */
 602         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 603                 int i;
 604
 605                 for (i = 0; i < 5; i++) {
 606                         int j = 24 + (i*4);
 607                         u8 a, b;
 608                         a = resp[j + 0];
 609                         b = resp[j + 1];
 610                         resp[j + 0] = resp[j + 3];
 611                         resp[j + 1] = resp[j + 2];
 612                         resp[j + 2] = b;
 613                         resp[j + 3] = a;
 614                 }
 615         }
 616
 617         kfree(rps_req);
 618         return res;
 619 }
 620 #endif
 621
 622 static void sas_ex_get_linkrate(struct domain_device *parent,
 623                                        struct domain_device *child,
 624                                        struct ex_phy *parent_phy)
 625 {
 626         struct expander_device *parent_ex = &parent->ex_dev;
 627         struct sas_port *port;
 628         int i;
 629
 630         child->pathways = 0;
 631
 632         port = parent_phy->port;
 633
 634         for (i = 0; i < parent_ex->num_phys; i++) {
 635                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 636
 637                 if (phy->phy_state == PHY_VACANT ||
 638                     phy->phy_state == PHY_NOT_PRESENT)
 639                         continue;
 640
 641                 if (SAS_ADDR(phy->attached_sas_addr) ==
 642                     SAS_ADDR(child->sas_addr)) {
 643
 644                         child->min_linkrate = min(parent->min_linkrate,
 645                                                   phy->linkrate);
 646                         child->max_linkrate = max(parent->max_linkrate,
 647                                                   phy->linkrate);
 648                         child->pathways++;
 649                         sas_port_add_phy(port, phy->phy);
 650                 }
 651         }
 652         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 653         child->pathways = min(child->pathways, parent->pathways);
 654 }
 655
 656 static struct domain_device *sas_ex_discover_end_dev(
 657         struct domain_device *parent, int phy_id)
 658 {
 659         struct expander_device *parent_ex = &parent->ex_dev;
 660         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 661         struct domain_device *child = NULL;
 662         struct sas_rphy *rphy;
 663         int res;
 664
 665         if (phy->attached_sata_host || phy->attached_sata_ps)
 666                 return NULL;
 667
 668         child = kzalloc(sizeof(*child), GFP_KERNEL);
 669         if (!child)
 670                 return NULL;
 671
 672         child->parent = parent;
 673         child->port   = parent->port;
 674         child->iproto = phy->attached_iproto;
 675         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 676         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 677         if (!phy->port) {
 678                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 679                 if (unlikely(!phy->port))
 680                         goto out_err;
 681                 if (unlikely(sas_port_add(phy->port) != 0)) {
 682                         sas_port_free(phy->port);
 683                         goto out_err;
 684                 }
 685         }
 686         sas_ex_get_linkrate(parent, child, phy);
 687
 688 #ifdef CONFIG_SCSI_SAS_ATA
 689         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 690                 child->dev_type = SATA_DEV;
 691                 if (phy->attached_tproto & SAS_PROTOCOL_STP)
 692                         child->tproto = phy->attached_tproto;
 693                 if (phy->attached_sata_dev)
 694                         child->tproto |= SATA_DEV;
 695                 res = sas_get_report_phy_sata(parent, phy_id,
 696                                               &child->sata_dev.rps_resp);
 697                 if (res) {
 698                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 699                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 700                                     phy_id, res);
 701                         goto out_free;
 702                 }
 703                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 704                        sizeof(struct dev_to_host_fis));
 705
 706                 rphy = sas_end_device_alloc(phy->port);
 707                 if (unlikely(!rphy))
 708                         goto out_free;
 709
 710                 sas_init_dev(child);
 711
 712                 child->rphy = rphy;
 713
 714                 spin_lock_irq(&parent->port->dev_list_lock);
 715                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 716                 spin_unlock_irq(&parent->port->dev_list_lock);
 717
 718                 res = sas_discover_sata(child);
 719                 if (res) {
 720                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 721                                     "%016llx:0x%x returned 0x%x\n",
 722                                     SAS_ADDR(child->sas_addr),
 723                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 724                         goto out_list_del;
 725                 }
 726         } else
 727 #endif
 728           if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 729                 child->dev_type = SAS_END_DEV;
 730                 rphy = sas_end_device_alloc(phy->port);
 731                 /* FIXME: error handling */
 732                 if (unlikely(!rphy))
 733                         goto out_free;
 734                 child->tproto = phy->attached_tproto;
 735                 sas_init_dev(child);
 736
 737                 child->rphy = rphy;
 738                 sas_fill_in_rphy(child, rphy);
 739
 740                 spin_lock_irq(&parent->port->dev_list_lock);
 741                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 742                 spin_unlock_irq(&parent->port->dev_list_lock);
 743
 744                 res = sas_discover_end_dev(child);
 745                 if (res) {
 746                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 747                                     "at %016llx:0x%x returned 0x%x\n",
 748                                     SAS_ADDR(child->sas_addr),
 749                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 750                         goto out_list_del;
 751                 }
 752         } else {
 753                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 754                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 755                             phy_id);
 756                 goto out_free;
 757         }
 758
 759         list_add_tail(&child->siblings, &parent_ex->children);
 760         return child;
 761
 762  out_list_del:
 763         sas_rphy_free(child->rphy);
 764         child->rphy = NULL;
 765
 766         spin_lock_irq(&parent->port->dev_list_lock);
 767         list_del(&child->dev_list_node);
 768         spin_unlock_irq(&parent->port->dev_list_lock);
 769  out_free:
 770         sas_port_delete(phy->port);
 771  out_err:
 772         phy->port = NULL;
 773         kfree(child);
 774         return NULL;
 775 }
 776
 777 /* See if this phy is part of a wide port */
 778 static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 779 {
 780         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 781         int i;
 782
 783         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 784                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 785
 786                 if (ephy == phy)
 787                         continue;
 788
 789                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 790                             SAS_ADDR_SIZE) && ephy->port) {
 791                         sas_port_add_phy(ephy->port, phy->phy);
 792                         phy->port = ephy->port;
 793                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 794                         return true;
 795                 }
 796         }
 797
 798         return false;
 799 }
 800
 801 static struct domain_device *sas_ex_discover_expander(
 802         struct domain_device *parent, int phy_id)
 803 {
 804         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 805         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 806         struct domain_device *child = NULL;
 807         struct sas_rphy *rphy;
 808         struct sas_expander_device *edev;
 809         struct asd_sas_port *port;
 810         int res;
 811
 812         if (phy->routing_attr == DIRECT_ROUTING) {
 813                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 814                             "allowed\n",
 815                             SAS_ADDR(parent->sas_addr), phy_id,
 816                             SAS_ADDR(phy->attached_sas_addr),
 817                             phy->attached_phy_id);
 818                 return NULL;
 819         }
 820         child = kzalloc(sizeof(*child), GFP_KERNEL);
 821         if (!child)
 822                 return NULL;
 823
 824         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 825         /* FIXME: better error handling */
 826         BUG_ON(sas_port_add(phy->port) != 0);
 827
 828
 829         switch (phy->attached_dev_type) {
 830         case EDGE_DEV:
 831                 rphy = sas_expander_alloc(phy->port,
 832                                           SAS_EDGE_EXPANDER_DEVICE);
 833                 break;
 834         case FANOUT_DEV:
 835                 rphy = sas_expander_alloc(phy->port,
 836                                           SAS_FANOUT_EXPANDER_DEVICE);
 837                 break;
 838         default:
 839                 rphy = NULL;    /* shut gcc up */
 840                 BUG();
 841         }
 842         port = parent->port;
 843         child->rphy = rphy;
 844         edev = rphy_to_expander_device(rphy);
 845         child->dev_type = phy->attached_dev_type;
 846         child->parent = parent;
 847         child->port = port;
 848         child->iproto = phy->attached_iproto;
 849         child->tproto = phy->attached_tproto;
 850         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 851         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 852         sas_ex_get_linkrate(parent, child, phy);
 853         edev->level = parent_ex->level + 1;
 854         parent->port->disc.max_level = max(parent->port->disc.max_level,
 855                                            edev->level);
 856         sas_init_dev(child);
 857         sas_fill_in_rphy(child, rphy);
 858         sas_rphy_add(rphy);
 859
 860         spin_lock_irq(&parent->port->dev_list_lock);
 861         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 862         spin_unlock_irq(&parent->port->dev_list_lock);
 863
 864         res = sas_discover_expander(child);
 865         if (res) {
 866                 spin_lock_irq(&parent->port->dev_list_lock);
 867                 list_del(&child->dev_list_node);
 868                 spin_unlock_irq(&parent->port->dev_list_lock);
 869                 kfree(child);
 870                 return NULL;
 871         }
 872         list_add_tail(&child->siblings, &parent->ex_dev.children);
 873         return child;
 874 }
 875
 876 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 877 {
 878         struct expander_device *ex = &dev->ex_dev;
 879         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 880         struct domain_device *child = NULL;
 881         int res = 0;
 882
 883         /* Phy state */
 884         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 885                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 886                         res = sas_ex_phy_discover(dev, phy_id);
 887                 if (res)
 888                         return res;
 889         }
 890
 891         /* Parent and domain coherency */
 892         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 893                              SAS_ADDR(dev->port->sas_addr))) {
 894                 sas_add_parent_port(dev, phy_id);
 895                 return 0;
 896         }
 897         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 898                             SAS_ADDR(dev->parent->sas_addr))) {
 899                 sas_add_parent_port(dev, phy_id);
 900                 if (ex_phy->routing_attr == TABLE_ROUTING)
 901                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 902                 return 0;
 903         }
 904
 905         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 906                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 907
 908         if (ex_phy->attached_dev_type == NO_DEVICE) {
 909                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 910                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 911                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 912                 }
 913                 return 0;
 914         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 915                 return 0;
 916
 917         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 918             ex_phy->attached_dev_type != FANOUT_DEV &&
 919             ex_phy->attached_dev_type != EDGE_DEV) {
 920                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 921                             "phy 0x%x\n", ex_phy->attached_dev_type,
 922                             SAS_ADDR(dev->sas_addr),
 923                             phy_id);
 924                 return 0;
 925         }
 926
 927         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 928         if (res) {
 929                 SAS_DPRINTK("configure routing for dev %016llx "
 930                             "reported 0x%x. Forgotten\n",
 931                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 932                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 933                 return res;
 934         }
 935
 936         if (sas_ex_join_wide_port(dev, phy_id)) {
 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                                 if (sas_ex_join_wide_port(dev, i))
 982                                         SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 983                                                     i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
 984
 985                         }
 986                 }
 987         }
 988
 989         return res;
 990 }
 991
 992 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 993 {
 994         struct expander_device *ex = &dev->ex_dev;
 995         int i;
 996
 997         for (i = 0; i < ex->num_phys; i++) {
 998                 struct ex_phy *phy = &ex->ex_phy[i];
 999
1000                 if (phy->phy_state == PHY_VACANT ||
1001                     phy->phy_state == PHY_NOT_PRESENT)
1002                         continue;
1003
1004                 if ((phy->attached_dev_type == EDGE_DEV ||
1005                      phy->attached_dev_type == FANOUT_DEV) &&
1006                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1007
1008                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1009
1010                         return 1;
1011                 }
1012         }
1013         return 0;
1014 }
1015
1016 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1017 {
1018         struct expander_device *ex = &dev->ex_dev;
1019         struct domain_device *child;
1020         u8 sub_addr[8] = {0, };
1021
1022         list_for_each_entry(child, &ex->children, siblings) {
1023                 if (child->dev_type != EDGE_DEV &&
1024                     child->dev_type != FANOUT_DEV)
1025                         continue;
1026                 if (sub_addr[0] == 0) {
1027                         sas_find_sub_addr(child, sub_addr);
1028                         continue;
1029                 } else {
1030                         u8 s2[8];
1031
1032                         if (sas_find_sub_addr(child, s2) &&
1033                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1034
1035                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1036                                             "diverges from subtractive "
1037                                             "boundary %016llx\n",
1038                                             SAS_ADDR(dev->sas_addr),
1039                                             SAS_ADDR(child->sas_addr),
1040                                             SAS_ADDR(s2),
1041                                             SAS_ADDR(sub_addr));
1042
1043                                 sas_ex_disable_port(child, s2);
1044                         }
1045                 }
1046         }
1047         return 0;
1048 }
1049 /**
1050  * sas_ex_discover_devices -- discover devices attached to this expander
1051  * dev: pointer to the expander domain device
1052  * single: if you want to do a single phy, else set to -1;
1053  *
1054  * Configure this expander for use with its devices and register the
1055  * devices of this expander.
1056  */
1057 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1058 {
1059         struct expander_device *ex = &dev->ex_dev;
1060         int i = 0, end = ex->num_phys;
1061         int res = 0;
1062
1063         if (0 <= single && single < end) {
1064                 i = single;
1065                 end = i+1;
1066         }
1067
1068         for ( ; i < end; i++) {
1069                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1070
1071                 if (ex_phy->phy_state == PHY_VACANT ||
1072                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1073                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1074                         continue;
1075
1076                 switch (ex_phy->linkrate) {
1077                 case SAS_PHY_DISABLED:
1078                 case SAS_PHY_RESET_PROBLEM:
1079                 case SAS_SATA_PORT_SELECTOR:
1080                         continue;
1081                 default:
1082                         res = sas_ex_discover_dev(dev, i);
1083                         if (res)
1084                                 break;
1085                         continue;
1086                 }
1087         }
1088
1089         if (!res)
1090                 sas_check_level_subtractive_boundary(dev);
1091
1092         return res;
1093 }
1094
1095 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1096 {
1097         struct expander_device *ex = &dev->ex_dev;
1098         int i;
1099         u8  *sub_sas_addr = NULL;
1100
1101         if (dev->dev_type != EDGE_DEV)
1102                 return 0;
1103
1104         for (i = 0; i < ex->num_phys; i++) {
1105                 struct ex_phy *phy = &ex->ex_phy[i];
1106
1107                 if (phy->phy_state == PHY_VACANT ||
1108                     phy->phy_state == PHY_NOT_PRESENT)
1109                         continue;
1110
1111                 if ((phy->attached_dev_type == FANOUT_DEV ||
1112                      phy->attached_dev_type == EDGE_DEV) &&
1113                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1114
1115                         if (!sub_sas_addr)
1116                                 sub_sas_addr = &phy->attached_sas_addr[0];
1117                         else if (SAS_ADDR(sub_sas_addr) !=
1118                                  SAS_ADDR(phy->attached_sas_addr)) {
1119
1120                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1121                                             "diverges(%016llx) on subtractive "
1122                                             "boundary(%016llx). Disabled\n",
1123                                             SAS_ADDR(dev->sas_addr), i,
1124                                             SAS_ADDR(phy->attached_sas_addr),
1125                                             SAS_ADDR(sub_sas_addr));
1126                                 sas_ex_disable_phy(dev, i);
1127                         }
1128                 }
1129         }
1130         return 0;
1131 }
1132
1133 static void sas_print_parent_topology_bug(struct domain_device *child,
1134                                                  struct ex_phy *parent_phy,
1135                                                  struct ex_phy *child_phy)
1136 {
1137         static const char ra_char[] = {
1138                 [DIRECT_ROUTING] = 'D',
1139                 [SUBTRACTIVE_ROUTING] = 'S',
1140                 [TABLE_ROUTING] = 'T',
1141         };
1142         static const char *ex_type[] = {
1143                 [EDGE_DEV] = "edge",
1144                 [FANOUT_DEV] = "fanout",
1145         };
1146         struct domain_device *parent = child->parent;
1147
1148         sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
1149                    "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
1150
1151                    ex_type[parent->dev_type],
1152                    SAS_ADDR(parent->sas_addr),
1153                    parent->ex_dev.t2t_supp,
1154                    parent_phy->phy_id,
1155
1156                    ex_type[child->dev_type],
1157                    SAS_ADDR(child->sas_addr),
1158                    child->ex_dev.t2t_supp,
1159                    child_phy->phy_id,
1160
1161                    ra_char[parent_phy->routing_attr],
1162                    ra_char[child_phy->routing_attr]);
1163 }
1164
1165 static int sas_check_eeds(struct domain_device *child,
1166                                  struct ex_phy *parent_phy,
1167                                  struct ex_phy *child_phy)
1168 {
1169         int res = 0;
1170         struct domain_device *parent = child->parent;
1171
1172         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1173                 res = -ENODEV;
1174                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1175                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1176                             SAS_ADDR(parent->sas_addr),
1177                             parent_phy->phy_id,
1178                             SAS_ADDR(child->sas_addr),
1179                             child_phy->phy_id,
1180                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1181         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1182                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1183                        SAS_ADDR_SIZE);
1184                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1185                        SAS_ADDR_SIZE);
1186         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1187                     SAS_ADDR(parent->sas_addr)) ||
1188                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1189                     SAS_ADDR(child->sas_addr)))
1190                    &&
1191                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1192                      SAS_ADDR(parent->sas_addr)) ||
1193                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1194                      SAS_ADDR(child->sas_addr))))
1195                 ;
1196         else {
1197                 res = -ENODEV;
1198                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1199                             "phy 0x%x link forms a third EEDS!\n",
1200                             SAS_ADDR(parent->sas_addr),
1201                             parent_phy->phy_id,
1202                             SAS_ADDR(child->sas_addr),
1203                             child_phy->phy_id);
1204         }
1205
1206         return res;
1207 }
1208
1209 /* Here we spill over 80 columns.  It is intentional.
1210  */
1211 static int sas_check_parent_topology(struct domain_device *child)
1212 {
1213         struct expander_device *child_ex = &child->ex_dev;
1214         struct expander_device *parent_ex;
1215         int i;
1216         int res = 0;
1217
1218         if (!child->parent)
1219                 return 0;
1220
1221         if (child->parent->dev_type != EDGE_DEV &&
1222             child->parent->dev_type != FANOUT_DEV)
1223                 return 0;
1224
1225         parent_ex = &child->parent->ex_dev;
1226
1227         for (i = 0; i < parent_ex->num_phys; i++) {
1228                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1229                 struct ex_phy *child_phy;
1230
1231                 if (parent_phy->phy_state == PHY_VACANT ||
1232                     parent_phy->phy_state == PHY_NOT_PRESENT)
1233                         continue;
1234
1235                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1236                         continue;
1237
1238                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1239
1240                 switch (child->parent->dev_type) {
1241                 case EDGE_DEV:
1242                         if (child->dev_type == FANOUT_DEV) {
1243                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1244                                     child_phy->routing_attr != TABLE_ROUTING) {
1245                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1246                                         res = -ENODEV;
1247                                 }
1248                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1249                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1250                                         res = sas_check_eeds(child, parent_phy, child_phy);
1251                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1252                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1253                                         res = -ENODEV;
1254                                 }
1255                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1256                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1257                                     (child_phy->routing_attr == TABLE_ROUTING &&
1258                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1259                                         /* All good */;
1260                                 } else {
1261                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1262                                         res = -ENODEV;
1263                                 }
1264                         }
1265                         break;
1266                 case FANOUT_DEV:
1267                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1268                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1269                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1270                                 res = -ENODEV;
1271                         }
1272                         break;
1273                 default:
1274                         break;
1275                 }
1276         }
1277
1278         return res;
1279 }
1280
1281 #define RRI_REQ_SIZE  16
1282 #define RRI_RESP_SIZE 44
1283
1284 static int sas_configure_present(struct domain_device *dev, int phy_id,
1285                                  u8 *sas_addr, int *index, int *present)
1286 {
1287         int i, res = 0;
1288         struct expander_device *ex = &dev->ex_dev;
1289         struct ex_phy *phy = &ex->ex_phy[phy_id];
1290         u8 *rri_req;
1291         u8 *rri_resp;
1292
1293         *present = 0;
1294         *index = 0;
1295
1296         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1297         if (!rri_req)
1298                 return -ENOMEM;
1299
1300         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1301         if (!rri_resp) {
1302                 kfree(rri_req);
1303                 return -ENOMEM;
1304         }
1305
1306         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1307         rri_req[9] = phy_id;
1308
1309         for (i = 0; i < ex->max_route_indexes ; i++) {
1310                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1311                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1312                                        RRI_RESP_SIZE);
1313                 if (res)
1314                         goto out;
1315                 res = rri_resp[2];
1316                 if (res == SMP_RESP_NO_INDEX) {
1317                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1318                                     "phy 0x%x index 0x%x\n",
1319                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1320                         goto out;
1321                 } else if (res != SMP_RESP_FUNC_ACC) {
1322                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1323                                     "result 0x%x\n", __func__,
1324                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1325                         goto out;
1326                 }
1327                 if (SAS_ADDR(sas_addr) != 0) {
1328                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1329                                 *index = i;
1330                                 if ((rri_resp[12] & 0x80) == 0x80)
1331                                         *present = 0;
1332                                 else
1333                                         *present = 1;
1334                                 goto out;
1335                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1336                                 *index = i;
1337                                 *present = 0;
1338                                 goto out;
1339                         }
1340                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1341                            phy->last_da_index < i) {
1342                         phy->last_da_index = i;
1343                         *index = i;
1344                         *present = 0;
1345                         goto out;
1346                 }
1347         }
1348         res = -1;
1349 out:
1350         kfree(rri_req);
1351         kfree(rri_resp);
1352         return res;
1353 }
1354
1355 #define CRI_REQ_SIZE  44
1356 #define CRI_RESP_SIZE  8
1357
1358 static int sas_configure_set(struct domain_device *dev, int phy_id,
1359                              u8 *sas_addr, int index, int include)
1360 {
1361         int res;
1362         u8 *cri_req;
1363         u8 *cri_resp;
1364
1365         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1366         if (!cri_req)
1367                 return -ENOMEM;
1368
1369         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1370         if (!cri_resp) {
1371                 kfree(cri_req);
1372                 return -ENOMEM;
1373         }
1374
1375         cri_req[1] = SMP_CONF_ROUTE_INFO;
1376         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1377         cri_req[9] = phy_id;
1378         if (SAS_ADDR(sas_addr) == 0 || !include)
1379                 cri_req[12] |= 0x80;
1380         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1381
1382         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1383                                CRI_RESP_SIZE);
1384         if (res)
1385                 goto out;
1386         res = cri_resp[2];
1387         if (res == SMP_RESP_NO_INDEX) {
1388                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1389                             "index 0x%x\n",
1390                             SAS_ADDR(dev->sas_addr), phy_id, index);
1391         }
1392 out:
1393         kfree(cri_req);
1394         kfree(cri_resp);
1395         return res;
1396 }
1397
1398 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1399                                     u8 *sas_addr, int include)
1400 {
1401         int index;
1402         int present;
1403         int res;
1404
1405         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1406         if (res)
1407                 return res;
1408         if (include ^ present)
1409                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1410
1411         return res;
1412 }
1413
1414 /**
1415  * sas_configure_parent -- configure routing table of parent
1416  * parent: parent expander
1417  * child: child expander
1418  * sas_addr: SAS port identifier of device directly attached to child
1419  */
1420 static int sas_configure_parent(struct domain_device *parent,
1421                                 struct domain_device *child,
1422                                 u8 *sas_addr, int include)
1423 {
1424         struct expander_device *ex_parent = &parent->ex_dev;
1425         int res = 0;
1426         int i;
1427
1428         if (parent->parent) {
1429                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1430                                            include);
1431                 if (res)
1432                         return res;
1433         }
1434
1435         if (ex_parent->conf_route_table == 0) {
1436                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1437                             SAS_ADDR(parent->sas_addr));
1438                 return 0;
1439         }
1440
1441         for (i = 0; i < ex_parent->num_phys; i++) {
1442                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1443
1444                 if ((phy->routing_attr == TABLE_ROUTING) &&
1445                     (SAS_ADDR(phy->attached_sas_addr) ==
1446                      SAS_ADDR(child->sas_addr))) {
1447                         res = sas_configure_phy(parent, i, sas_addr, include);
1448                         if (res)
1449                                 return res;
1450                 }
1451         }
1452
1453         return res;
1454 }
1455
1456 /**
1457  * sas_configure_routing -- configure routing
1458  * dev: expander device
1459  * sas_addr: port identifier of device directly attached to the expander device
1460  */
1461 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1462 {
1463         if (dev->parent)
1464                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1465         return 0;
1466 }
1467
1468 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1469 {
1470         if (dev->parent)
1471                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1472         return 0;
1473 }
1474
1475 /**
1476  * sas_discover_expander -- expander discovery
1477  * @ex: pointer to expander domain device
1478  *
1479  * See comment in sas_discover_sata().
1480  */
1481 static int sas_discover_expander(struct domain_device *dev)
1482 {
1483         int res;
1484
1485         res = sas_notify_lldd_dev_found(dev);
1486         if (res)
1487                 return res;
1488
1489         res = sas_ex_general(dev);
1490         if (res)
1491                 goto out_err;
1492         res = sas_ex_manuf_info(dev);
1493         if (res)
1494                 goto out_err;
1495
1496         res = sas_expander_discover(dev);
1497         if (res) {
1498                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1499                             SAS_ADDR(dev->sas_addr), res);
1500                 goto out_err;
1501         }
1502
1503         sas_check_ex_subtractive_boundary(dev);
1504         res = sas_check_parent_topology(dev);
1505         if (res)
1506                 goto out_err;
1507         return 0;
1508 out_err:
1509         sas_notify_lldd_dev_gone(dev);
1510         return res;
1511 }
1512
1513 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1514 {
1515         int res = 0;
1516         struct domain_device *dev;
1517
1518         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1519                 if (dev->dev_type == EDGE_DEV ||
1520                     dev->dev_type == FANOUT_DEV) {
1521                         struct sas_expander_device *ex =
1522                                 rphy_to_expander_device(dev->rphy);
1523
1524                         if (level == ex->level)
1525                                 res = sas_ex_discover_devices(dev, -1);
1526                         else if (level > 0)
1527                                 res = sas_ex_discover_devices(port->port_dev, -1);
1528
1529                 }
1530         }
1531
1532         return res;
1533 }
1534
1535 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1536 {
1537         int res;
1538         int level;
1539
1540         do {
1541                 level = port->disc.max_level;
1542                 res = sas_ex_level_discovery(port, level);
1543                 mb();
1544         } while (level < port->disc.max_level);
1545
1546         return res;
1547 }
1548
1549 int sas_discover_root_expander(struct domain_device *dev)
1550 {
1551         int res;
1552         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1553
1554         res = sas_rphy_add(dev->rphy);
1555         if (res)
1556                 goto out_err;
1557
1558         ex->level = dev->port->disc.max_level; /* 0 */
1559         res = sas_discover_expander(dev);
1560         if (res)
1561                 goto out_err2;
1562
1563         sas_ex_bfs_disc(dev->port);
1564
1565         return res;
1566
1567 out_err2:
1568         sas_rphy_remove(dev->rphy);
1569 out_err:
1570         return res;
1571 }
1572
1573 /* ---------- Domain revalidation ---------- */
1574
1575 static int sas_get_phy_discover(struct domain_device *dev,
1576                                 int phy_id, struct smp_resp *disc_resp)
1577 {
1578         int res;
1579         u8 *disc_req;
1580
1581         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1582         if (!disc_req)
1583                 return -ENOMEM;
1584
1585         disc_req[1] = SMP_DISCOVER;
1586         disc_req[9] = phy_id;
1587
1588         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1589                                disc_resp, DISCOVER_RESP_SIZE);
1590         if (res)
1591                 goto out;
1592         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1593                 res = disc_resp->result;
1594                 goto out;
1595         }
1596 out:
1597         kfree(disc_req);
1598         return res;
1599 }
1600
1601 static int sas_get_phy_change_count(struct domain_device *dev,
1602                                     int phy_id, int *pcc)
1603 {
1604         int res;
1605         struct smp_resp *disc_resp;
1606
1607         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1608         if (!disc_resp)
1609                 return -ENOMEM;
1610
1611         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1612         if (!res)
1613                 *pcc = disc_resp->disc.change_count;
1614
1615         kfree(disc_resp);
1616         return res;
1617 }
1618
1619 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1620                                          int phy_id, u8 *attached_sas_addr)
1621 {
1622         int res;
1623         struct smp_resp *disc_resp;
1624         struct discover_resp *dr;
1625
1626         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1627         if (!disc_resp)
1628                 return -ENOMEM;
1629         dr = &disc_resp->disc;
1630
1631         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1632         if (!res) {
1633                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1634                 if (dr->attached_dev_type == 0)
1635                         memset(attached_sas_addr, 0, 8);
1636         }
1637         kfree(disc_resp);
1638         return res;
1639 }
1640
1641 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1642                               int from_phy, bool update)
1643 {
1644         struct expander_device *ex = &dev->ex_dev;
1645         int res = 0;
1646         int i;
1647
1648         for (i = from_phy; i < ex->num_phys; i++) {
1649                 int phy_change_count = 0;
1650
1651                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1652                 switch (res) {
1653                 case SMP_RESP_PHY_VACANT:
1654                 case SMP_RESP_NO_PHY:
1655                         continue;
1656                 case SMP_RESP_FUNC_ACC:
1657                         break;
1658                 default:
1659                         return res;
1660                 }
1661
1662                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1663                         if (update)
1664                                 ex->ex_phy[i].phy_change_count =
1665                                         phy_change_count;
1666                         *phy_id = i;
1667                         return 0;
1668                 }
1669         }
1670         return 0;
1671 }
1672
1673 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1674 {
1675         int res;
1676         u8  *rg_req;
1677         struct smp_resp  *rg_resp;
1678
1679         rg_req = alloc_smp_req(RG_REQ_SIZE);
1680         if (!rg_req)
1681                 return -ENOMEM;
1682
1683         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1684         if (!rg_resp) {
1685                 kfree(rg_req);
1686                 return -ENOMEM;
1687         }
1688
1689         rg_req[1] = SMP_REPORT_GENERAL;
1690
1691         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1692                                RG_RESP_SIZE);
1693         if (res)
1694                 goto out;
1695         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1696                 res = rg_resp->result;
1697                 goto out;
1698         }
1699
1700         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1701 out:
1702         kfree(rg_resp);
1703         kfree(rg_req);
1704         return res;
1705 }
1706 /**
1707  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1708  * @dev:domain device to be detect.
1709  * @src_dev: the device which originated BROADCAST(CHANGE).
1710  *
1711  * Add self-configuration expander suport. Suppose two expander cascading,
1712  * when the first level expander is self-configuring, hotplug the disks in
1713  * second level expander, BROADCAST(CHANGE) will not only be originated
1714  * in the second level expander, but also be originated in the first level
1715  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1716  * expander changed count in two level expanders will all increment at least
1717  * once, but the phy which chang count has changed is the source device which
1718  * we concerned.
1719  */
1720
1721 static int sas_find_bcast_dev(struct domain_device *dev,
1722                               struct domain_device **src_dev)
1723 {
1724         struct expander_device *ex = &dev->ex_dev;
1725         int ex_change_count = -1;
1726         int phy_id = -1;
1727         int res;
1728         struct domain_device *ch;
1729
1730         res = sas_get_ex_change_count(dev, &ex_change_count);
1731         if (res)
1732                 goto out;
1733         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1734                 /* Just detect if this expander phys phy change count changed,
1735                 * in order to determine if this expander originate BROADCAST,
1736                 * and do not update phy change count field in our structure.
1737                 */
1738                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1739                 if (phy_id != -1) {
1740                         *src_dev = dev;
1741                         ex->ex_change_count = ex_change_count;
1742                         SAS_DPRINTK("Expander phy change count has changed\n");
1743                         return res;
1744                 } else
1745                         SAS_DPRINTK("Expander phys DID NOT change\n");
1746         }
1747         list_for_each_entry(ch, &ex->children, siblings) {
1748                 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1749                         res = sas_find_bcast_dev(ch, src_dev);
1750                         if (*src_dev)
1751                                 return res;
1752                 }
1753         }
1754 out:
1755         return res;
1756 }
1757
1758 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1759 {
1760         struct expander_device *ex = &dev->ex_dev;
1761         struct domain_device *child, *n;
1762
1763         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1764                 child->gone = 1;
1765                 if (child->dev_type == EDGE_DEV ||
1766                     child->dev_type == FANOUT_DEV)
1767                         sas_unregister_ex_tree(port, child);
1768                 else
1769                         sas_unregister_dev(port, child);
1770         }
1771         sas_unregister_dev(port, dev);
1772 }
1773
1774 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1775                                          int phy_id, bool last)
1776 {
1777         struct expander_device *ex_dev = &parent->ex_dev;
1778         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1779         struct domain_device *child, *n;
1780         if (last) {
1781                 list_for_each_entry_safe(child, n,
1782                         &ex_dev->children, siblings) {
1783                         if (SAS_ADDR(child->sas_addr) ==
1784                             SAS_ADDR(phy->attached_sas_addr)) {
1785                                 child->gone = 1;
1786                                 if (child->dev_type == EDGE_DEV ||
1787                                     child->dev_type == FANOUT_DEV)
1788                                         sas_unregister_ex_tree(parent->port, child);
1789                                 else
1790                                         sas_unregister_dev(parent->port, child);
1791                                 break;
1792                         }
1793                 }
1794                 parent->gone = 1;
1795                 sas_disable_routing(parent, phy->attached_sas_addr);
1796         }
1797         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1798         if (phy->port) {
1799                 sas_port_delete_phy(phy->port, phy->phy);
1800                 if (phy->port->num_phys == 0)
1801                         sas_port_delete(phy->port);
1802                 phy->port = NULL;
1803         }
1804 }
1805
1806 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1807                                           const int level)
1808 {
1809         struct expander_device *ex_root = &root->ex_dev;
1810         struct domain_device *child;
1811         int res = 0;
1812
1813         list_for_each_entry(child, &ex_root->children, siblings) {
1814                 if (child->dev_type == EDGE_DEV ||
1815                     child->dev_type == FANOUT_DEV) {
1816                         struct sas_expander_device *ex =
1817                                 rphy_to_expander_device(child->rphy);
1818
1819                         if (level > ex->level)
1820                                 res = sas_discover_bfs_by_root_level(child,
1821                                                                      level);
1822                         else if (level == ex->level)
1823                                 res = sas_ex_discover_devices(child, -1);
1824                 }
1825         }
1826         return res;
1827 }
1828
1829 static int sas_discover_bfs_by_root(struct domain_device *dev)
1830 {
1831         int res;
1832         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1833         int level = ex->level+1;
1834
1835         res = sas_ex_discover_devices(dev, -1);
1836         if (res)
1837                 goto out;
1838         do {
1839                 res = sas_discover_bfs_by_root_level(dev, level);
1840                 mb();
1841                 level += 1;
1842         } while (level <= dev->port->disc.max_level);
1843 out:
1844         return res;
1845 }
1846
1847 static int sas_discover_new(struct domain_device *dev, int phy_id)
1848 {
1849         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1850         struct domain_device *child;
1851         int res;
1852
1853         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1854                     SAS_ADDR(dev->sas_addr), phy_id);
1855         res = sas_ex_phy_discover(dev, phy_id);
1856         if (res)
1857                 return res;
1858
1859         if (sas_ex_join_wide_port(dev, phy_id))
1860                 return 0;
1861
1862         res = sas_ex_discover_devices(dev, phy_id);
1863         if (res)
1864                 return res;
1865         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1866                 if (SAS_ADDR(child->sas_addr) ==
1867                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1868                         if (child->dev_type == EDGE_DEV ||
1869                             child->dev_type == FANOUT_DEV)
1870                                 res = sas_discover_bfs_by_root(child);
1871                         break;
1872                 }
1873         }
1874         return res;
1875 }
1876
1877 static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
1878 {
1879         struct expander_device *ex = &dev->ex_dev;
1880         struct ex_phy *phy = &ex->ex_phy[phy_id];
1881         u8 attached_sas_addr[8];
1882         int res;
1883
1884         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1885         switch (res) {
1886         case SMP_RESP_NO_PHY:
1887                 phy->phy_state = PHY_NOT_PRESENT;
1888                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1889                 goto out; break;
1890         case SMP_RESP_PHY_VACANT:
1891                 phy->phy_state = PHY_VACANT;
1892                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1893                 goto out; break;
1894         case SMP_RESP_FUNC_ACC:
1895                 break;
1896         }
1897
1898         if (SAS_ADDR(attached_sas_addr) == 0) {
1899                 phy->phy_state = PHY_EMPTY;
1900                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1901         } else if (SAS_ADDR(attached_sas_addr) ==
1902                    SAS_ADDR(phy->attached_sas_addr)) {
1903                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1904                             SAS_ADDR(dev->sas_addr), phy_id);
1905                 sas_ex_phy_discover(dev, phy_id);
1906         } else
1907                 res = sas_discover_new(dev, phy_id);
1908 out:
1909         return res;
1910 }
1911
1912 /**
1913  * sas_rediscover - revalidate the domain.
1914  * @dev:domain device to be detect.
1915  * @phy_id: the phy id will be detected.
1916  *
1917  * NOTE: this process _must_ quit (return) as soon as any connection
1918  * errors are encountered.  Connection recovery is done elsewhere.
1919  * Discover process only interrogates devices in order to discover the
1920  * domain.For plugging out, we un-register the device only when it is
1921  * the last phy in the port, for other phys in this port, we just delete it
1922  * from the port.For inserting, we do discovery when it is the
1923  * first phy,for other phys in this port, we add it to the port to
1924  * forming the wide-port.
1925  */
1926 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1927 {
1928         struct expander_device *ex = &dev->ex_dev;
1929         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1930         int res = 0;
1931         int i;
1932         bool last = true;       /* is this the last phy of the port */
1933
1934         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1935                     SAS_ADDR(dev->sas_addr), phy_id);
1936
1937         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1938                 for (i = 0; i < ex->num_phys; i++) {
1939                         struct ex_phy *phy = &ex->ex_phy[i];
1940
1941                         if (i == phy_id)
1942                                 continue;
1943                         if (SAS_ADDR(phy->attached_sas_addr) ==
1944                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1945                                 SAS_DPRINTK("phy%d part of wide port with "
1946                                             "phy%d\n", phy_id, i);
1947                                 last = false;
1948                                 break;
1949                         }
1950                 }
1951                 res = sas_rediscover_dev(dev, phy_id, last);
1952         } else
1953                 res = sas_discover_new(dev, phy_id);
1954         return res;
1955 }
1956
1957 /**
1958  * sas_revalidate_domain -- revalidate the domain
1959  * @port: port to the domain of interest
1960  *
1961  * NOTE: this process _must_ quit (return) as soon as any connection
1962  * errors are encountered.  Connection recovery is done elsewhere.
1963  * Discover process only interrogates devices in order to discover the
1964  * domain.
1965  */
1966 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1967 {
1968         int res;
1969         struct domain_device *dev = NULL;
1970
1971         res = sas_find_bcast_dev(port_dev, &dev);
1972         while (res == 0 && dev) {
1973                 struct expander_device *ex = &dev->ex_dev;
1974                 int i = 0, phy_id;
1975
1976                 do {
1977                         phy_id = -1;
1978                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
1979                         if (phy_id == -1)
1980                                 break;
1981                         res = sas_rediscover(dev, phy_id);
1982                         i = phy_id + 1;
1983                 } while (i < ex->num_phys);
1984
1985                 dev = NULL;
1986                 res = sas_find_bcast_dev(port_dev, &dev);
1987         }
1988         return res;
1989 }
1990
1991 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1992                     struct request *req)
1993 {
1994         struct domain_device *dev;
1995         int ret, type;
1996         struct request *rsp = req->next_rq;
1997
1998         if (!rsp) {
1999                 printk("%s: space for a smp response is missing\n",
2000                        __func__);
2001                 return -EINVAL;
2002         }
2003
2004         /* no rphy means no smp target support (ie aic94xx host) */
2005         if (!rphy)
2006                 return sas_smp_host_handler(shost, req, rsp);
2007
2008         type = rphy->identify.device_type;
2009
2010         if (type != SAS_EDGE_EXPANDER_DEVICE &&
2011             type != SAS_FANOUT_EXPANDER_DEVICE) {
2012                 printk("%s: can we send a smp request to a device?\n",
2013                        __func__);
2014                 return -EINVAL;
2015         }
2016
2017         dev = sas_find_dev_by_rphy(rphy);
2018         if (!dev) {
2019                 printk("%s: fail to find a domain_device?\n", __func__);
2020                 return -EINVAL;
2021         }
2022
2023         /* do we need to support multiple segments? */
2024         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2025                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
2026                        __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2027                        rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
2028                 return -EINVAL;
2029         }
2030
2031         ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2032                                bio_data(rsp->bio), blk_rq_bytes(rsp));
2033         if (ret > 0) {
2034                 /* positive number is the untransferred residual */
2035                 rsp->resid_len = ret;
2036                 req->resid_len = 0;
2037                 ret = 0;
2038         } else if (ret == 0) {
2039                 rsp->resid_len = 0;
2040                 req->resid_len = 0;
2041         }
2042
2043         return ret;
2044 }