sas_expander.c revision 81c757bc696284f39f07766f0c2ca67af64ce9bd
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/sas_ata.h> 32#include <scsi/scsi_transport.h> 33#include <scsi/scsi_transport_sas.h> 34#include "../scsi_sas_internal.h" 35 36static int sas_discover_expander(struct domain_device *dev); 37static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr); 38static int sas_configure_phy(struct domain_device *dev, int phy_id, 39 u8 *sas_addr, int include); 40static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr); 41 42/* ---------- SMP task management ---------- */ 43 44static void smp_task_timedout(unsigned long _task) 45{ 46 struct sas_task *task = (void *) _task; 47 unsigned long flags; 48 49 spin_lock_irqsave(&task->task_state_lock, flags); 50 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 51 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 52 spin_unlock_irqrestore(&task->task_state_lock, flags); 53 54 complete(&task->completion); 55} 56 57static void smp_task_done(struct sas_task *task) 58{ 59 if (!del_timer(&task->timer)) 60 return; 61 complete(&task->completion); 62} 63 64/* Give it some long enough timeout. In seconds. */ 65#define SMP_TIMEOUT 10 66 67static int smp_execute_task(struct domain_device *dev, void *req, int req_size, 68 void *resp, int resp_size) 69{ 70 int res, retry; 71 struct sas_task *task = NULL; 72 struct sas_internal *i = 73 to_sas_internal(dev->port->ha->core.shost->transportt); 74 75 for (retry = 0; retry < 3; retry++) { 76 task = sas_alloc_task(GFP_KERNEL); 77 if (!task) 78 return -ENOMEM; 79 80 task->dev = dev; 81 task->task_proto = dev->tproto; 82 sg_init_one(&task->smp_task.smp_req, req, req_size); 83 sg_init_one(&task->smp_task.smp_resp, resp, resp_size); 84 85 task->task_done = smp_task_done; 86 87 task->timer.data = (unsigned long) task; 88 task->timer.function = smp_task_timedout; 89 task->timer.expires = jiffies + SMP_TIMEOUT*HZ; 90 add_timer(&task->timer); 91 92 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL); 93 94 if (res) { 95 del_timer(&task->timer); 96 SAS_DPRINTK("executing SMP task failed:%d\n", res); 97 goto ex_err; 98 } 99 100 wait_for_completion(&task->completion); 101 res = -ECOMM; 102 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) { 103 SAS_DPRINTK("smp task timed out or aborted\n"); 104 i->dft->lldd_abort_task(task); 105 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { 106 SAS_DPRINTK("SMP task aborted and not done\n"); 107 goto ex_err; 108 } 109 } 110 if (task->task_status.resp == SAS_TASK_COMPLETE && 111 task->task_status.stat == SAM_STAT_GOOD) { 112 res = 0; 113 break; 114 } if (task->task_status.resp == SAS_TASK_COMPLETE && 115 task->task_status.stat == SAS_DATA_UNDERRUN) { 116 /* no error, but return the number of bytes of 117 * underrun */ 118 res = task->task_status.residual; 119 break; 120 } if (task->task_status.resp == SAS_TASK_COMPLETE && 121 task->task_status.stat == SAS_DATA_OVERRUN) { 122 res = -EMSGSIZE; 123 break; 124 } else { 125 SAS_DPRINTK("%s: task to dev %016llx response: 0x%x " 126 "status 0x%x\n", __func__, 127 SAS_ADDR(dev->sas_addr), 128 task->task_status.resp, 129 task->task_status.stat); 130 sas_free_task(task); 131 task = NULL; 132 } 133 } 134ex_err: 135 BUG_ON(retry == 3 && task != NULL); 136 if (task != NULL) { 137 sas_free_task(task); 138 } 139 return res; 140} 141 142/* ---------- Allocations ---------- */ 143 144static inline void *alloc_smp_req(int size) 145{ 146 u8 *p = kzalloc(size, GFP_KERNEL); 147 if (p) 148 p[0] = SMP_REQUEST; 149 return p; 150} 151 152static inline void *alloc_smp_resp(int size) 153{ 154 return kzalloc(size, GFP_KERNEL); 155} 156 157/* ---------- Expander configuration ---------- */ 158 159static void sas_set_ex_phy(struct domain_device *dev, int phy_id, 160 void *disc_resp) 161{ 162 struct expander_device *ex = &dev->ex_dev; 163 struct ex_phy *phy = &ex->ex_phy[phy_id]; 164 struct smp_resp *resp = disc_resp; 165 struct discover_resp *dr = &resp->disc; 166 struct sas_rphy *rphy = dev->rphy; 167 int rediscover = (phy->phy != NULL); 168 169 if (!rediscover) { 170 phy->phy = sas_phy_alloc(&rphy->dev, phy_id); 171 172 /* FIXME: error_handling */ 173 BUG_ON(!phy->phy); 174 } 175 176 switch (resp->result) { 177 case SMP_RESP_PHY_VACANT: 178 phy->phy_state = PHY_VACANT; 179 break; 180 default: 181 phy->phy_state = PHY_NOT_PRESENT; 182 break; 183 case SMP_RESP_FUNC_ACC: 184 phy->phy_state = PHY_EMPTY; /* do not know yet */ 185 break; 186 } 187 188 phy->phy_id = phy_id; 189 phy->attached_dev_type = dr->attached_dev_type; 190 phy->linkrate = dr->linkrate; 191 phy->attached_sata_host = dr->attached_sata_host; 192 phy->attached_sata_dev = dr->attached_sata_dev; 193 phy->attached_sata_ps = dr->attached_sata_ps; 194 phy->attached_iproto = dr->iproto << 1; 195 phy->attached_tproto = dr->tproto << 1; 196 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE); 197 phy->attached_phy_id = dr->attached_phy_id; 198 phy->phy_change_count = dr->change_count; 199 phy->routing_attr = dr->routing_attr; 200 phy->virtual = dr->virtual; 201 phy->last_da_index = -1; 202 203 phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr); 204 phy->phy->identify.device_type = phy->attached_dev_type; 205 phy->phy->identify.initiator_port_protocols = phy->attached_iproto; 206 phy->phy->identify.target_port_protocols = phy->attached_tproto; 207 phy->phy->identify.phy_identifier = phy_id; 208 phy->phy->minimum_linkrate_hw = dr->hmin_linkrate; 209 phy->phy->maximum_linkrate_hw = dr->hmax_linkrate; 210 phy->phy->minimum_linkrate = dr->pmin_linkrate; 211 phy->phy->maximum_linkrate = dr->pmax_linkrate; 212 phy->phy->negotiated_linkrate = phy->linkrate; 213 214 if (!rediscover) 215 if (sas_phy_add(phy->phy)) { 216 sas_phy_free(phy->phy); 217 return; 218 } 219 220 SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n", 221 SAS_ADDR(dev->sas_addr), phy->phy_id, 222 phy->routing_attr == TABLE_ROUTING ? 'T' : 223 phy->routing_attr == DIRECT_ROUTING ? 'D' : 224 phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?', 225 SAS_ADDR(phy->attached_sas_addr)); 226 227 return; 228} 229 230/* check if we have an existing attached ata device on this expander phy */ 231struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id) 232{ 233 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id]; 234 struct domain_device *dev; 235 struct sas_rphy *rphy; 236 237 if (!ex_phy->port) 238 return NULL; 239 240 rphy = ex_phy->port->rphy; 241 if (!rphy) 242 return NULL; 243 244 dev = sas_find_dev_by_rphy(rphy); 245 246 if (dev && dev_is_sata(dev)) 247 return dev; 248 249 return NULL; 250} 251 252#define DISCOVER_REQ_SIZE 16 253#define DISCOVER_RESP_SIZE 56 254 255static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req, 256 u8 *disc_resp, int single) 257{ 258 struct domain_device *ata_dev = sas_ex_to_ata(dev, single); 259 int i, res; 260 261 disc_req[9] = single; 262 for (i = 1 ; i < 3; i++) { 263 struct discover_resp *dr; 264 265 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE, 266 disc_resp, DISCOVER_RESP_SIZE); 267 if (res) 268 return res; 269 dr = &((struct smp_resp *)disc_resp)->disc; 270 if (memcmp(dev->sas_addr, dr->attached_sas_addr, 271 SAS_ADDR_SIZE) == 0) { 272 sas_printk("Found loopback topology, just ignore it!\n"); 273 return 0; 274 } 275 276 /* This is detecting a failure to transmit initial 277 * dev to host FIS as described in section J.5 of 278 * sas-2 r16 279 */ 280 if (!(dr->attached_dev_type == 0 && 281 dr->attached_sata_dev)) 282 break; 283 284 /* In order to generate the dev to host FIS, we send a 285 * link reset to the expander port. If a device was 286 * previously detected on this port we ask libata to 287 * manage the reset and link recovery. 288 */ 289 if (ata_dev) { 290 sas_ata_schedule_reset(ata_dev); 291 break; 292 } 293 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL); 294 /* Wait for the reset to trigger the negotiation */ 295 msleep(500); 296 } 297 sas_set_ex_phy(dev, single, disc_resp); 298 return 0; 299} 300 301static int sas_ex_phy_discover(struct domain_device *dev, int single) 302{ 303 struct expander_device *ex = &dev->ex_dev; 304 int res = 0; 305 u8 *disc_req; 306 u8 *disc_resp; 307 308 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE); 309 if (!disc_req) 310 return -ENOMEM; 311 312 disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE); 313 if (!disc_resp) { 314 kfree(disc_req); 315 return -ENOMEM; 316 } 317 318 disc_req[1] = SMP_DISCOVER; 319 320 if (0 <= single && single < ex->num_phys) { 321 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single); 322 } else { 323 int i; 324 325 for (i = 0; i < ex->num_phys; i++) { 326 res = sas_ex_phy_discover_helper(dev, disc_req, 327 disc_resp, i); 328 if (res) 329 goto out_err; 330 } 331 } 332out_err: 333 kfree(disc_resp); 334 kfree(disc_req); 335 return res; 336} 337 338static int sas_expander_discover(struct domain_device *dev) 339{ 340 struct expander_device *ex = &dev->ex_dev; 341 int res = -ENOMEM; 342 343 ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL); 344 if (!ex->ex_phy) 345 return -ENOMEM; 346 347 res = sas_ex_phy_discover(dev, -1); 348 if (res) 349 goto out_err; 350 351 return 0; 352 out_err: 353 kfree(ex->ex_phy); 354 ex->ex_phy = NULL; 355 return res; 356} 357 358#define MAX_EXPANDER_PHYS 128 359 360static void ex_assign_report_general(struct domain_device *dev, 361 struct smp_resp *resp) 362{ 363 struct report_general_resp *rg = &resp->rg; 364 365 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count); 366 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes); 367 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS); 368 dev->ex_dev.t2t_supp = rg->t2t_supp; 369 dev->ex_dev.conf_route_table = rg->conf_route_table; 370 dev->ex_dev.configuring = rg->configuring; 371 memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8); 372} 373 374#define RG_REQ_SIZE 8 375#define RG_RESP_SIZE 32 376 377static int sas_ex_general(struct domain_device *dev) 378{ 379 u8 *rg_req; 380 struct smp_resp *rg_resp; 381 int res; 382 int i; 383 384 rg_req = alloc_smp_req(RG_REQ_SIZE); 385 if (!rg_req) 386 return -ENOMEM; 387 388 rg_resp = alloc_smp_resp(RG_RESP_SIZE); 389 if (!rg_resp) { 390 kfree(rg_req); 391 return -ENOMEM; 392 } 393 394 rg_req[1] = SMP_REPORT_GENERAL; 395 396 for (i = 0; i < 5; i++) { 397 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp, 398 RG_RESP_SIZE); 399 400 if (res) { 401 SAS_DPRINTK("RG to ex %016llx failed:0x%x\n", 402 SAS_ADDR(dev->sas_addr), res); 403 goto out; 404 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) { 405 SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n", 406 SAS_ADDR(dev->sas_addr), rg_resp->result); 407 res = rg_resp->result; 408 goto out; 409 } 410 411 ex_assign_report_general(dev, rg_resp); 412 413 if (dev->ex_dev.configuring) { 414 SAS_DPRINTK("RG: ex %llx self-configuring...\n", 415 SAS_ADDR(dev->sas_addr)); 416 schedule_timeout_interruptible(5*HZ); 417 } else 418 break; 419 } 420out: 421 kfree(rg_req); 422 kfree(rg_resp); 423 return res; 424} 425 426static void ex_assign_manuf_info(struct domain_device *dev, void 427 *_mi_resp) 428{ 429 u8 *mi_resp = _mi_resp; 430 struct sas_rphy *rphy = dev->rphy; 431 struct sas_expander_device *edev = rphy_to_expander_device(rphy); 432 433 memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN); 434 memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN); 435 memcpy(edev->product_rev, mi_resp + 36, 436 SAS_EXPANDER_PRODUCT_REV_LEN); 437 438 if (mi_resp[8] & 1) { 439 memcpy(edev->component_vendor_id, mi_resp + 40, 440 SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN); 441 edev->component_id = mi_resp[48] << 8 | mi_resp[49]; 442 edev->component_revision_id = mi_resp[50]; 443 } 444} 445 446#define MI_REQ_SIZE 8 447#define MI_RESP_SIZE 64 448 449static int sas_ex_manuf_info(struct domain_device *dev) 450{ 451 u8 *mi_req; 452 u8 *mi_resp; 453 int res; 454 455 mi_req = alloc_smp_req(MI_REQ_SIZE); 456 if (!mi_req) 457 return -ENOMEM; 458 459 mi_resp = alloc_smp_resp(MI_RESP_SIZE); 460 if (!mi_resp) { 461 kfree(mi_req); 462 return -ENOMEM; 463 } 464 465 mi_req[1] = SMP_REPORT_MANUF_INFO; 466 467 res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE); 468 if (res) { 469 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n", 470 SAS_ADDR(dev->sas_addr), res); 471 goto out; 472 } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) { 473 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n", 474 SAS_ADDR(dev->sas_addr), mi_resp[2]); 475 goto out; 476 } 477 478 ex_assign_manuf_info(dev, mi_resp); 479out: 480 kfree(mi_req); 481 kfree(mi_resp); 482 return res; 483} 484 485#define PC_REQ_SIZE 44 486#define PC_RESP_SIZE 8 487 488int sas_smp_phy_control(struct domain_device *dev, int phy_id, 489 enum phy_func phy_func, 490 struct sas_phy_linkrates *rates) 491{ 492 u8 *pc_req; 493 u8 *pc_resp; 494 int res; 495 496 pc_req = alloc_smp_req(PC_REQ_SIZE); 497 if (!pc_req) 498 return -ENOMEM; 499 500 pc_resp = alloc_smp_resp(PC_RESP_SIZE); 501 if (!pc_resp) { 502 kfree(pc_req); 503 return -ENOMEM; 504 } 505 506 pc_req[1] = SMP_PHY_CONTROL; 507 pc_req[9] = phy_id; 508 pc_req[10]= phy_func; 509 if (rates) { 510 pc_req[32] = rates->minimum_linkrate << 4; 511 pc_req[33] = rates->maximum_linkrate << 4; 512 } 513 514 res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE); 515 516 kfree(pc_resp); 517 kfree(pc_req); 518 return res; 519} 520 521static void sas_ex_disable_phy(struct domain_device *dev, int phy_id) 522{ 523 struct expander_device *ex = &dev->ex_dev; 524 struct ex_phy *phy = &ex->ex_phy[phy_id]; 525 526 sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL); 527 phy->linkrate = SAS_PHY_DISABLED; 528} 529 530static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr) 531{ 532 struct expander_device *ex = &dev->ex_dev; 533 int i; 534 535 for (i = 0; i < ex->num_phys; i++) { 536 struct ex_phy *phy = &ex->ex_phy[i]; 537 538 if (phy->phy_state == PHY_VACANT || 539 phy->phy_state == PHY_NOT_PRESENT) 540 continue; 541 542 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr)) 543 sas_ex_disable_phy(dev, i); 544 } 545} 546 547static int sas_dev_present_in_domain(struct asd_sas_port *port, 548 u8 *sas_addr) 549{ 550 struct domain_device *dev; 551 552 if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr)) 553 return 1; 554 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 555 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr)) 556 return 1; 557 } 558 return 0; 559} 560 561#define RPEL_REQ_SIZE 16 562#define RPEL_RESP_SIZE 32 563int sas_smp_get_phy_events(struct sas_phy *phy) 564{ 565 int res; 566 u8 *req; 567 u8 *resp; 568 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 569 struct domain_device *dev = sas_find_dev_by_rphy(rphy); 570 571 req = alloc_smp_req(RPEL_REQ_SIZE); 572 if (!req) 573 return -ENOMEM; 574 575 resp = alloc_smp_resp(RPEL_RESP_SIZE); 576 if (!resp) { 577 kfree(req); 578 return -ENOMEM; 579 } 580 581 req[1] = SMP_REPORT_PHY_ERR_LOG; 582 req[9] = phy->number; 583 584 res = smp_execute_task(dev, req, RPEL_REQ_SIZE, 585 resp, RPEL_RESP_SIZE); 586 587 if (!res) 588 goto out; 589 590 phy->invalid_dword_count = scsi_to_u32(&resp[12]); 591 phy->running_disparity_error_count = scsi_to_u32(&resp[16]); 592 phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]); 593 phy->phy_reset_problem_count = scsi_to_u32(&resp[24]); 594 595 out: 596 kfree(resp); 597 return res; 598 599} 600 601#ifdef CONFIG_SCSI_SAS_ATA 602 603#define RPS_REQ_SIZE 16 604#define RPS_RESP_SIZE 60 605 606static int sas_get_report_phy_sata(struct domain_device *dev, 607 int phy_id, 608 struct smp_resp *rps_resp) 609{ 610 int res; 611 u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE); 612 u8 *resp = (u8 *)rps_resp; 613 614 if (!rps_req) 615 return -ENOMEM; 616 617 rps_req[1] = SMP_REPORT_PHY_SATA; 618 rps_req[9] = phy_id; 619 620 res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE, 621 rps_resp, RPS_RESP_SIZE); 622 623 /* 0x34 is the FIS type for the D2H fis. There's a potential 624 * standards cockup here. sas-2 explicitly specifies the FIS 625 * should be encoded so that FIS type is in resp[24]. 626 * However, some expanders endian reverse this. Undo the 627 * reversal here */ 628 if (!res && resp[27] == 0x34 && resp[24] != 0x34) { 629 int i; 630 631 for (i = 0; i < 5; i++) { 632 int j = 24 + (i*4); 633 u8 a, b; 634 a = resp[j + 0]; 635 b = resp[j + 1]; 636 resp[j + 0] = resp[j + 3]; 637 resp[j + 1] = resp[j + 2]; 638 resp[j + 2] = b; 639 resp[j + 3] = a; 640 } 641 } 642 643 kfree(rps_req); 644 return res; 645} 646#endif 647 648static void sas_ex_get_linkrate(struct domain_device *parent, 649 struct domain_device *child, 650 struct ex_phy *parent_phy) 651{ 652 struct expander_device *parent_ex = &parent->ex_dev; 653 struct sas_port *port; 654 int i; 655 656 child->pathways = 0; 657 658 port = parent_phy->port; 659 660 for (i = 0; i < parent_ex->num_phys; i++) { 661 struct ex_phy *phy = &parent_ex->ex_phy[i]; 662 663 if (phy->phy_state == PHY_VACANT || 664 phy->phy_state == PHY_NOT_PRESENT) 665 continue; 666 667 if (SAS_ADDR(phy->attached_sas_addr) == 668 SAS_ADDR(child->sas_addr)) { 669 670 child->min_linkrate = min(parent->min_linkrate, 671 phy->linkrate); 672 child->max_linkrate = max(parent->max_linkrate, 673 phy->linkrate); 674 child->pathways++; 675 sas_port_add_phy(port, phy->phy); 676 } 677 } 678 child->linkrate = min(parent_phy->linkrate, child->max_linkrate); 679 child->pathways = min(child->pathways, parent->pathways); 680} 681 682static struct domain_device *sas_ex_discover_end_dev( 683 struct domain_device *parent, int phy_id) 684{ 685 struct expander_device *parent_ex = &parent->ex_dev; 686 struct ex_phy *phy = &parent_ex->ex_phy[phy_id]; 687 struct domain_device *child = NULL; 688 struct sas_rphy *rphy; 689 int res; 690 691 if (phy->attached_sata_host || phy->attached_sata_ps) 692 return NULL; 693 694 child = sas_alloc_device(); 695 if (!child) 696 return NULL; 697 698 kref_get(&parent->kref); 699 child->parent = parent; 700 child->port = parent->port; 701 child->iproto = phy->attached_iproto; 702 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE); 703 sas_hash_addr(child->hashed_sas_addr, child->sas_addr); 704 if (!phy->port) { 705 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id); 706 if (unlikely(!phy->port)) 707 goto out_err; 708 if (unlikely(sas_port_add(phy->port) != 0)) { 709 sas_port_free(phy->port); 710 goto out_err; 711 } 712 } 713 sas_ex_get_linkrate(parent, child, phy); 714 715#ifdef CONFIG_SCSI_SAS_ATA 716 if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) { 717 child->dev_type = SATA_DEV; 718 if (phy->attached_tproto & SAS_PROTOCOL_STP) 719 child->tproto = phy->attached_tproto; 720 if (phy->attached_sata_dev) 721 child->tproto |= SATA_DEV; 722 res = sas_get_report_phy_sata(parent, phy_id, 723 &child->sata_dev.rps_resp); 724 if (res) { 725 SAS_DPRINTK("report phy sata to %016llx:0x%x returned " 726 "0x%x\n", SAS_ADDR(parent->sas_addr), 727 phy_id, res); 728 goto out_free; 729 } 730 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis, 731 sizeof(struct dev_to_host_fis)); 732 733 rphy = sas_end_device_alloc(phy->port); 734 if (unlikely(!rphy)) 735 goto out_free; 736 737 sas_init_dev(child); 738 739 child->rphy = rphy; 740 741 list_add_tail(&child->disco_list_node, &parent->port->disco_list); 742 743 res = sas_discover_sata(child); 744 if (res) { 745 SAS_DPRINTK("sas_discover_sata() for device %16llx at " 746 "%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#endif 753 if (phy->attached_tproto & SAS_PROTOCOL_SSP) { 754 child->dev_type = SAS_END_DEV; 755 rphy = sas_end_device_alloc(phy->port); 756 /* FIXME: error handling */ 757 if (unlikely(!rphy)) 758 goto out_free; 759 child->tproto = phy->attached_tproto; 760 sas_init_dev(child); 761 762 child->rphy = rphy; 763 sas_fill_in_rphy(child, rphy); 764 765 spin_lock_irq(&parent->port->dev_list_lock); 766 list_add_tail(&child->dev_list_node, &parent->port->dev_list); 767 spin_unlock_irq(&parent->port->dev_list_lock); 768 769 res = sas_discover_end_dev(child); 770 if (res) { 771 SAS_DPRINTK("sas_discover_end_dev() for device %16llx " 772 "at %016llx:0x%x returned 0x%x\n", 773 SAS_ADDR(child->sas_addr), 774 SAS_ADDR(parent->sas_addr), phy_id, res); 775 goto out_list_del; 776 } 777 } else { 778 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n", 779 phy->attached_tproto, SAS_ADDR(parent->sas_addr), 780 phy_id); 781 goto out_free; 782 } 783 784 list_add_tail(&child->siblings, &parent_ex->children); 785 return child; 786 787 out_list_del: 788 sas_rphy_free(child->rphy); 789 child->rphy = NULL; 790 791 list_del(&child->disco_list_node); 792 spin_lock_irq(&parent->port->dev_list_lock); 793 list_del(&child->dev_list_node); 794 spin_unlock_irq(&parent->port->dev_list_lock); 795 out_free: 796 sas_port_delete(phy->port); 797 out_err: 798 phy->port = NULL; 799 sas_put_device(child); 800 return NULL; 801} 802 803/* See if this phy is part of a wide port */ 804static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id) 805{ 806 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id]; 807 int i; 808 809 for (i = 0; i < parent->ex_dev.num_phys; i++) { 810 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i]; 811 812 if (ephy == phy) 813 continue; 814 815 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr, 816 SAS_ADDR_SIZE) && ephy->port) { 817 sas_port_add_phy(ephy->port, phy->phy); 818 phy->port = ephy->port; 819 phy->phy_state = PHY_DEVICE_DISCOVERED; 820 return 0; 821 } 822 } 823 824 return -ENODEV; 825} 826 827static struct domain_device *sas_ex_discover_expander( 828 struct domain_device *parent, int phy_id) 829{ 830 struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy); 831 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id]; 832 struct domain_device *child = NULL; 833 struct sas_rphy *rphy; 834 struct sas_expander_device *edev; 835 struct asd_sas_port *port; 836 int res; 837 838 if (phy->routing_attr == DIRECT_ROUTING) { 839 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not " 840 "allowed\n", 841 SAS_ADDR(parent->sas_addr), phy_id, 842 SAS_ADDR(phy->attached_sas_addr), 843 phy->attached_phy_id); 844 return NULL; 845 } 846 child = sas_alloc_device(); 847 if (!child) 848 return NULL; 849 850 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id); 851 /* FIXME: better error handling */ 852 BUG_ON(sas_port_add(phy->port) != 0); 853 854 855 switch (phy->attached_dev_type) { 856 case EDGE_DEV: 857 rphy = sas_expander_alloc(phy->port, 858 SAS_EDGE_EXPANDER_DEVICE); 859 break; 860 case FANOUT_DEV: 861 rphy = sas_expander_alloc(phy->port, 862 SAS_FANOUT_EXPANDER_DEVICE); 863 break; 864 default: 865 rphy = NULL; /* shut gcc up */ 866 BUG(); 867 } 868 port = parent->port; 869 child->rphy = rphy; 870 edev = rphy_to_expander_device(rphy); 871 child->dev_type = phy->attached_dev_type; 872 kref_get(&parent->kref); 873 child->parent = parent; 874 child->port = port; 875 child->iproto = phy->attached_iproto; 876 child->tproto = phy->attached_tproto; 877 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE); 878 sas_hash_addr(child->hashed_sas_addr, child->sas_addr); 879 sas_ex_get_linkrate(parent, child, phy); 880 edev->level = parent_ex->level + 1; 881 parent->port->disc.max_level = max(parent->port->disc.max_level, 882 edev->level); 883 sas_init_dev(child); 884 sas_fill_in_rphy(child, rphy); 885 sas_rphy_add(rphy); 886 887 spin_lock_irq(&parent->port->dev_list_lock); 888 list_add_tail(&child->dev_list_node, &parent->port->dev_list); 889 spin_unlock_irq(&parent->port->dev_list_lock); 890 891 res = sas_discover_expander(child); 892 if (res) { 893 spin_lock_irq(&parent->port->dev_list_lock); 894 list_del(&child->dev_list_node); 895 spin_unlock_irq(&parent->port->dev_list_lock); 896 sas_put_device(child); 897 return NULL; 898 } 899 list_add_tail(&child->siblings, &parent->ex_dev.children); 900 return child; 901} 902 903static int sas_ex_discover_dev(struct domain_device *dev, int phy_id) 904{ 905 struct expander_device *ex = &dev->ex_dev; 906 struct ex_phy *ex_phy = &ex->ex_phy[phy_id]; 907 struct domain_device *child = NULL; 908 int res = 0; 909 910 /* Phy state */ 911 if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) { 912 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL)) 913 res = sas_ex_phy_discover(dev, phy_id); 914 if (res) 915 return res; 916 } 917 918 /* Parent and domain coherency */ 919 if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) == 920 SAS_ADDR(dev->port->sas_addr))) { 921 sas_add_parent_port(dev, phy_id); 922 return 0; 923 } 924 if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) == 925 SAS_ADDR(dev->parent->sas_addr))) { 926 sas_add_parent_port(dev, phy_id); 927 if (ex_phy->routing_attr == TABLE_ROUTING) 928 sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1); 929 return 0; 930 } 931 932 if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr)) 933 sas_ex_disable_port(dev, ex_phy->attached_sas_addr); 934 935 if (ex_phy->attached_dev_type == NO_DEVICE) { 936 if (ex_phy->routing_attr == DIRECT_ROUTING) { 937 memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE); 938 sas_configure_routing(dev, ex_phy->attached_sas_addr); 939 } 940 return 0; 941 } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN) 942 return 0; 943 944 if (ex_phy->attached_dev_type != SAS_END_DEV && 945 ex_phy->attached_dev_type != FANOUT_DEV && 946 ex_phy->attached_dev_type != EDGE_DEV) { 947 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx " 948 "phy 0x%x\n", ex_phy->attached_dev_type, 949 SAS_ADDR(dev->sas_addr), 950 phy_id); 951 return 0; 952 } 953 954 res = sas_configure_routing(dev, ex_phy->attached_sas_addr); 955 if (res) { 956 SAS_DPRINTK("configure routing for dev %016llx " 957 "reported 0x%x. Forgotten\n", 958 SAS_ADDR(ex_phy->attached_sas_addr), res); 959 sas_disable_routing(dev, ex_phy->attached_sas_addr); 960 return res; 961 } 962 963 res = sas_ex_join_wide_port(dev, phy_id); 964 if (!res) { 965 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n", 966 phy_id, SAS_ADDR(ex_phy->attached_sas_addr)); 967 return res; 968 } 969 970 switch (ex_phy->attached_dev_type) { 971 case SAS_END_DEV: 972 child = sas_ex_discover_end_dev(dev, phy_id); 973 break; 974 case FANOUT_DEV: 975 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) { 976 SAS_DPRINTK("second fanout expander %016llx phy 0x%x " 977 "attached to ex %016llx phy 0x%x\n", 978 SAS_ADDR(ex_phy->attached_sas_addr), 979 ex_phy->attached_phy_id, 980 SAS_ADDR(dev->sas_addr), 981 phy_id); 982 sas_ex_disable_phy(dev, phy_id); 983 break; 984 } else 985 memcpy(dev->port->disc.fanout_sas_addr, 986 ex_phy->attached_sas_addr, SAS_ADDR_SIZE); 987 /* fallthrough */ 988 case EDGE_DEV: 989 child = sas_ex_discover_expander(dev, phy_id); 990 break; 991 default: 992 break; 993 } 994 995 if (child) { 996 int i; 997 998 for (i = 0; i < ex->num_phys; i++) { 999 if (ex->ex_phy[i].phy_state == PHY_VACANT || 1000 ex->ex_phy[i].phy_state == PHY_NOT_PRESENT) 1001 continue; 1002 /* 1003 * Due to races, the phy might not get added to the 1004 * wide port, so we add the phy to the wide port here. 1005 */ 1006 if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) == 1007 SAS_ADDR(child->sas_addr)) { 1008 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED; 1009 res = sas_ex_join_wide_port(dev, i); 1010 if (!res) 1011 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n", 1012 i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr)); 1013 1014 } 1015 } 1016 } 1017 1018 return res; 1019} 1020 1021static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr) 1022{ 1023 struct expander_device *ex = &dev->ex_dev; 1024 int i; 1025 1026 for (i = 0; i < ex->num_phys; i++) { 1027 struct ex_phy *phy = &ex->ex_phy[i]; 1028 1029 if (phy->phy_state == PHY_VACANT || 1030 phy->phy_state == PHY_NOT_PRESENT) 1031 continue; 1032 1033 if ((phy->attached_dev_type == EDGE_DEV || 1034 phy->attached_dev_type == FANOUT_DEV) && 1035 phy->routing_attr == SUBTRACTIVE_ROUTING) { 1036 1037 memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE); 1038 1039 return 1; 1040 } 1041 } 1042 return 0; 1043} 1044 1045static int sas_check_level_subtractive_boundary(struct domain_device *dev) 1046{ 1047 struct expander_device *ex = &dev->ex_dev; 1048 struct domain_device *child; 1049 u8 sub_addr[8] = {0, }; 1050 1051 list_for_each_entry(child, &ex->children, siblings) { 1052 if (child->dev_type != EDGE_DEV && 1053 child->dev_type != FANOUT_DEV) 1054 continue; 1055 if (sub_addr[0] == 0) { 1056 sas_find_sub_addr(child, sub_addr); 1057 continue; 1058 } else { 1059 u8 s2[8]; 1060 1061 if (sas_find_sub_addr(child, s2) && 1062 (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) { 1063 1064 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx " 1065 "diverges from subtractive " 1066 "boundary %016llx\n", 1067 SAS_ADDR(dev->sas_addr), 1068 SAS_ADDR(child->sas_addr), 1069 SAS_ADDR(s2), 1070 SAS_ADDR(sub_addr)); 1071 1072 sas_ex_disable_port(child, s2); 1073 } 1074 } 1075 } 1076 return 0; 1077} 1078/** 1079 * sas_ex_discover_devices -- discover devices attached to this expander 1080 * dev: pointer to the expander domain device 1081 * single: if you want to do a single phy, else set to -1; 1082 * 1083 * Configure this expander for use with its devices and register the 1084 * devices of this expander. 1085 */ 1086static int sas_ex_discover_devices(struct domain_device *dev, int single) 1087{ 1088 struct expander_device *ex = &dev->ex_dev; 1089 int i = 0, end = ex->num_phys; 1090 int res = 0; 1091 1092 if (0 <= single && single < end) { 1093 i = single; 1094 end = i+1; 1095 } 1096 1097 for ( ; i < end; i++) { 1098 struct ex_phy *ex_phy = &ex->ex_phy[i]; 1099 1100 if (ex_phy->phy_state == PHY_VACANT || 1101 ex_phy->phy_state == PHY_NOT_PRESENT || 1102 ex_phy->phy_state == PHY_DEVICE_DISCOVERED) 1103 continue; 1104 1105 switch (ex_phy->linkrate) { 1106 case SAS_PHY_DISABLED: 1107 case SAS_PHY_RESET_PROBLEM: 1108 case SAS_SATA_PORT_SELECTOR: 1109 continue; 1110 default: 1111 res = sas_ex_discover_dev(dev, i); 1112 if (res) 1113 break; 1114 continue; 1115 } 1116 } 1117 1118 if (!res) 1119 sas_check_level_subtractive_boundary(dev); 1120 1121 return res; 1122} 1123 1124static int sas_check_ex_subtractive_boundary(struct domain_device *dev) 1125{ 1126 struct expander_device *ex = &dev->ex_dev; 1127 int i; 1128 u8 *sub_sas_addr = NULL; 1129 1130 if (dev->dev_type != EDGE_DEV) 1131 return 0; 1132 1133 for (i = 0; i < ex->num_phys; i++) { 1134 struct ex_phy *phy = &ex->ex_phy[i]; 1135 1136 if (phy->phy_state == PHY_VACANT || 1137 phy->phy_state == PHY_NOT_PRESENT) 1138 continue; 1139 1140 if ((phy->attached_dev_type == FANOUT_DEV || 1141 phy->attached_dev_type == EDGE_DEV) && 1142 phy->routing_attr == SUBTRACTIVE_ROUTING) { 1143 1144 if (!sub_sas_addr) 1145 sub_sas_addr = &phy->attached_sas_addr[0]; 1146 else if (SAS_ADDR(sub_sas_addr) != 1147 SAS_ADDR(phy->attached_sas_addr)) { 1148 1149 SAS_DPRINTK("ex %016llx phy 0x%x " 1150 "diverges(%016llx) on subtractive " 1151 "boundary(%016llx). Disabled\n", 1152 SAS_ADDR(dev->sas_addr), i, 1153 SAS_ADDR(phy->attached_sas_addr), 1154 SAS_ADDR(sub_sas_addr)); 1155 sas_ex_disable_phy(dev, i); 1156 } 1157 } 1158 } 1159 return 0; 1160} 1161 1162static void sas_print_parent_topology_bug(struct domain_device *child, 1163 struct ex_phy *parent_phy, 1164 struct ex_phy *child_phy) 1165{ 1166 static const char ra_char[] = { 1167 [DIRECT_ROUTING] = 'D', 1168 [SUBTRACTIVE_ROUTING] = 'S', 1169 [TABLE_ROUTING] = 'T', 1170 }; 1171 static const char *ex_type[] = { 1172 [EDGE_DEV] = "edge", 1173 [FANOUT_DEV] = "fanout", 1174 }; 1175 struct domain_device *parent = child->parent; 1176 1177 sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx " 1178 "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n", 1179 1180 ex_type[parent->dev_type], 1181 SAS_ADDR(parent->sas_addr), 1182 parent->ex_dev.t2t_supp, 1183 parent_phy->phy_id, 1184 1185 ex_type[child->dev_type], 1186 SAS_ADDR(child->sas_addr), 1187 child->ex_dev.t2t_supp, 1188 child_phy->phy_id, 1189 1190 ra_char[parent_phy->routing_attr], 1191 ra_char[child_phy->routing_attr]); 1192} 1193 1194static int sas_check_eeds(struct domain_device *child, 1195 struct ex_phy *parent_phy, 1196 struct ex_phy *child_phy) 1197{ 1198 int res = 0; 1199 struct domain_device *parent = child->parent; 1200 1201 if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) { 1202 res = -ENODEV; 1203 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx " 1204 "phy S:0x%x, while there is a fanout ex %016llx\n", 1205 SAS_ADDR(parent->sas_addr), 1206 parent_phy->phy_id, 1207 SAS_ADDR(child->sas_addr), 1208 child_phy->phy_id, 1209 SAS_ADDR(parent->port->disc.fanout_sas_addr)); 1210 } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) { 1211 memcpy(parent->port->disc.eeds_a, parent->sas_addr, 1212 SAS_ADDR_SIZE); 1213 memcpy(parent->port->disc.eeds_b, child->sas_addr, 1214 SAS_ADDR_SIZE); 1215 } else if (((SAS_ADDR(parent->port->disc.eeds_a) == 1216 SAS_ADDR(parent->sas_addr)) || 1217 (SAS_ADDR(parent->port->disc.eeds_a) == 1218 SAS_ADDR(child->sas_addr))) 1219 && 1220 ((SAS_ADDR(parent->port->disc.eeds_b) == 1221 SAS_ADDR(parent->sas_addr)) || 1222 (SAS_ADDR(parent->port->disc.eeds_b) == 1223 SAS_ADDR(child->sas_addr)))) 1224 ; 1225 else { 1226 res = -ENODEV; 1227 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx " 1228 "phy 0x%x link forms a third EEDS!\n", 1229 SAS_ADDR(parent->sas_addr), 1230 parent_phy->phy_id, 1231 SAS_ADDR(child->sas_addr), 1232 child_phy->phy_id); 1233 } 1234 1235 return res; 1236} 1237 1238/* Here we spill over 80 columns. It is intentional. 1239 */ 1240static int sas_check_parent_topology(struct domain_device *child) 1241{ 1242 struct expander_device *child_ex = &child->ex_dev; 1243 struct expander_device *parent_ex; 1244 int i; 1245 int res = 0; 1246 1247 if (!child->parent) 1248 return 0; 1249 1250 if (child->parent->dev_type != EDGE_DEV && 1251 child->parent->dev_type != FANOUT_DEV) 1252 return 0; 1253 1254 parent_ex = &child->parent->ex_dev; 1255 1256 for (i = 0; i < parent_ex->num_phys; i++) { 1257 struct ex_phy *parent_phy = &parent_ex->ex_phy[i]; 1258 struct ex_phy *child_phy; 1259 1260 if (parent_phy->phy_state == PHY_VACANT || 1261 parent_phy->phy_state == PHY_NOT_PRESENT) 1262 continue; 1263 1264 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr)) 1265 continue; 1266 1267 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id]; 1268 1269 switch (child->parent->dev_type) { 1270 case EDGE_DEV: 1271 if (child->dev_type == FANOUT_DEV) { 1272 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING || 1273 child_phy->routing_attr != TABLE_ROUTING) { 1274 sas_print_parent_topology_bug(child, parent_phy, child_phy); 1275 res = -ENODEV; 1276 } 1277 } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) { 1278 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) { 1279 res = sas_check_eeds(child, parent_phy, child_phy); 1280 } else if (child_phy->routing_attr != TABLE_ROUTING) { 1281 sas_print_parent_topology_bug(child, parent_phy, child_phy); 1282 res = -ENODEV; 1283 } 1284 } else if (parent_phy->routing_attr == TABLE_ROUTING) { 1285 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING || 1286 (child_phy->routing_attr == TABLE_ROUTING && 1287 child_ex->t2t_supp && parent_ex->t2t_supp)) { 1288 /* All good */; 1289 } else { 1290 sas_print_parent_topology_bug(child, parent_phy, child_phy); 1291 res = -ENODEV; 1292 } 1293 } 1294 break; 1295 case FANOUT_DEV: 1296 if (parent_phy->routing_attr != TABLE_ROUTING || 1297 child_phy->routing_attr != SUBTRACTIVE_ROUTING) { 1298 sas_print_parent_topology_bug(child, parent_phy, child_phy); 1299 res = -ENODEV; 1300 } 1301 break; 1302 default: 1303 break; 1304 } 1305 } 1306 1307 return res; 1308} 1309 1310#define RRI_REQ_SIZE 16 1311#define RRI_RESP_SIZE 44 1312 1313static int sas_configure_present(struct domain_device *dev, int phy_id, 1314 u8 *sas_addr, int *index, int *present) 1315{ 1316 int i, res = 0; 1317 struct expander_device *ex = &dev->ex_dev; 1318 struct ex_phy *phy = &ex->ex_phy[phy_id]; 1319 u8 *rri_req; 1320 u8 *rri_resp; 1321 1322 *present = 0; 1323 *index = 0; 1324 1325 rri_req = alloc_smp_req(RRI_REQ_SIZE); 1326 if (!rri_req) 1327 return -ENOMEM; 1328 1329 rri_resp = alloc_smp_resp(RRI_RESP_SIZE); 1330 if (!rri_resp) { 1331 kfree(rri_req); 1332 return -ENOMEM; 1333 } 1334 1335 rri_req[1] = SMP_REPORT_ROUTE_INFO; 1336 rri_req[9] = phy_id; 1337 1338 for (i = 0; i < ex->max_route_indexes ; i++) { 1339 *(__be16 *)(rri_req+6) = cpu_to_be16(i); 1340 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp, 1341 RRI_RESP_SIZE); 1342 if (res) 1343 goto out; 1344 res = rri_resp[2]; 1345 if (res == SMP_RESP_NO_INDEX) { 1346 SAS_DPRINTK("overflow of indexes: dev %016llx " 1347 "phy 0x%x index 0x%x\n", 1348 SAS_ADDR(dev->sas_addr), phy_id, i); 1349 goto out; 1350 } else if (res != SMP_RESP_FUNC_ACC) { 1351 SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x " 1352 "result 0x%x\n", __func__, 1353 SAS_ADDR(dev->sas_addr), phy_id, i, res); 1354 goto out; 1355 } 1356 if (SAS_ADDR(sas_addr) != 0) { 1357 if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) { 1358 *index = i; 1359 if ((rri_resp[12] & 0x80) == 0x80) 1360 *present = 0; 1361 else 1362 *present = 1; 1363 goto out; 1364 } else if (SAS_ADDR(rri_resp+16) == 0) { 1365 *index = i; 1366 *present = 0; 1367 goto out; 1368 } 1369 } else if (SAS_ADDR(rri_resp+16) == 0 && 1370 phy->last_da_index < i) { 1371 phy->last_da_index = i; 1372 *index = i; 1373 *present = 0; 1374 goto out; 1375 } 1376 } 1377 res = -1; 1378out: 1379 kfree(rri_req); 1380 kfree(rri_resp); 1381 return res; 1382} 1383 1384#define CRI_REQ_SIZE 44 1385#define CRI_RESP_SIZE 8 1386 1387static int sas_configure_set(struct domain_device *dev, int phy_id, 1388 u8 *sas_addr, int index, int include) 1389{ 1390 int res; 1391 u8 *cri_req; 1392 u8 *cri_resp; 1393 1394 cri_req = alloc_smp_req(CRI_REQ_SIZE); 1395 if (!cri_req) 1396 return -ENOMEM; 1397 1398 cri_resp = alloc_smp_resp(CRI_RESP_SIZE); 1399 if (!cri_resp) { 1400 kfree(cri_req); 1401 return -ENOMEM; 1402 } 1403 1404 cri_req[1] = SMP_CONF_ROUTE_INFO; 1405 *(__be16 *)(cri_req+6) = cpu_to_be16(index); 1406 cri_req[9] = phy_id; 1407 if (SAS_ADDR(sas_addr) == 0 || !include) 1408 cri_req[12] |= 0x80; 1409 memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE); 1410 1411 res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp, 1412 CRI_RESP_SIZE); 1413 if (res) 1414 goto out; 1415 res = cri_resp[2]; 1416 if (res == SMP_RESP_NO_INDEX) { 1417 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x " 1418 "index 0x%x\n", 1419 SAS_ADDR(dev->sas_addr), phy_id, index); 1420 } 1421out: 1422 kfree(cri_req); 1423 kfree(cri_resp); 1424 return res; 1425} 1426 1427static int sas_configure_phy(struct domain_device *dev, int phy_id, 1428 u8 *sas_addr, int include) 1429{ 1430 int index; 1431 int present; 1432 int res; 1433 1434 res = sas_configure_present(dev, phy_id, sas_addr, &index, &present); 1435 if (res) 1436 return res; 1437 if (include ^ present) 1438 return sas_configure_set(dev, phy_id, sas_addr, index,include); 1439 1440 return res; 1441} 1442 1443/** 1444 * sas_configure_parent -- configure routing table of parent 1445 * parent: parent expander 1446 * child: child expander 1447 * sas_addr: SAS port identifier of device directly attached to child 1448 */ 1449static int sas_configure_parent(struct domain_device *parent, 1450 struct domain_device *child, 1451 u8 *sas_addr, int include) 1452{ 1453 struct expander_device *ex_parent = &parent->ex_dev; 1454 int res = 0; 1455 int i; 1456 1457 if (parent->parent) { 1458 res = sas_configure_parent(parent->parent, parent, sas_addr, 1459 include); 1460 if (res) 1461 return res; 1462 } 1463 1464 if (ex_parent->conf_route_table == 0) { 1465 SAS_DPRINTK("ex %016llx has self-configuring routing table\n", 1466 SAS_ADDR(parent->sas_addr)); 1467 return 0; 1468 } 1469 1470 for (i = 0; i < ex_parent->num_phys; i++) { 1471 struct ex_phy *phy = &ex_parent->ex_phy[i]; 1472 1473 if ((phy->routing_attr == TABLE_ROUTING) && 1474 (SAS_ADDR(phy->attached_sas_addr) == 1475 SAS_ADDR(child->sas_addr))) { 1476 res = sas_configure_phy(parent, i, sas_addr, include); 1477 if (res) 1478 return res; 1479 } 1480 } 1481 1482 return res; 1483} 1484 1485/** 1486 * sas_configure_routing -- configure routing 1487 * dev: expander device 1488 * sas_addr: port identifier of device directly attached to the expander device 1489 */ 1490static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr) 1491{ 1492 if (dev->parent) 1493 return sas_configure_parent(dev->parent, dev, sas_addr, 1); 1494 return 0; 1495} 1496 1497static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr) 1498{ 1499 if (dev->parent) 1500 return sas_configure_parent(dev->parent, dev, sas_addr, 0); 1501 return 0; 1502} 1503 1504/** 1505 * sas_discover_expander -- expander discovery 1506 * @ex: pointer to expander domain device 1507 * 1508 * See comment in sas_discover_sata(). 1509 */ 1510static int sas_discover_expander(struct domain_device *dev) 1511{ 1512 int res; 1513 1514 res = sas_notify_lldd_dev_found(dev); 1515 if (res) 1516 return res; 1517 1518 res = sas_ex_general(dev); 1519 if (res) 1520 goto out_err; 1521 res = sas_ex_manuf_info(dev); 1522 if (res) 1523 goto out_err; 1524 1525 res = sas_expander_discover(dev); 1526 if (res) { 1527 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n", 1528 SAS_ADDR(dev->sas_addr), res); 1529 goto out_err; 1530 } 1531 1532 sas_check_ex_subtractive_boundary(dev); 1533 res = sas_check_parent_topology(dev); 1534 if (res) 1535 goto out_err; 1536 return 0; 1537out_err: 1538 sas_notify_lldd_dev_gone(dev); 1539 return res; 1540} 1541 1542static int sas_ex_level_discovery(struct asd_sas_port *port, const int level) 1543{ 1544 int res = 0; 1545 struct domain_device *dev; 1546 1547 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 1548 if (dev->dev_type == EDGE_DEV || 1549 dev->dev_type == FANOUT_DEV) { 1550 struct sas_expander_device *ex = 1551 rphy_to_expander_device(dev->rphy); 1552 1553 if (level == ex->level) 1554 res = sas_ex_discover_devices(dev, -1); 1555 else if (level > 0) 1556 res = sas_ex_discover_devices(port->port_dev, -1); 1557 1558 } 1559 } 1560 1561 return res; 1562} 1563 1564static int sas_ex_bfs_disc(struct asd_sas_port *port) 1565{ 1566 int res; 1567 int level; 1568 1569 do { 1570 level = port->disc.max_level; 1571 res = sas_ex_level_discovery(port, level); 1572 mb(); 1573 } while (level < port->disc.max_level); 1574 1575 return res; 1576} 1577 1578int sas_discover_root_expander(struct domain_device *dev) 1579{ 1580 int res; 1581 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy); 1582 1583 res = sas_rphy_add(dev->rphy); 1584 if (res) 1585 goto out_err; 1586 1587 ex->level = dev->port->disc.max_level; /* 0 */ 1588 res = sas_discover_expander(dev); 1589 if (res) 1590 goto out_err2; 1591 1592 sas_ex_bfs_disc(dev->port); 1593 1594 return res; 1595 1596out_err2: 1597 sas_rphy_remove(dev->rphy); 1598out_err: 1599 return res; 1600} 1601 1602/* ---------- Domain revalidation ---------- */ 1603 1604static int sas_get_phy_discover(struct domain_device *dev, 1605 int phy_id, struct smp_resp *disc_resp) 1606{ 1607 int res; 1608 u8 *disc_req; 1609 1610 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE); 1611 if (!disc_req) 1612 return -ENOMEM; 1613 1614 disc_req[1] = SMP_DISCOVER; 1615 disc_req[9] = phy_id; 1616 1617 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE, 1618 disc_resp, DISCOVER_RESP_SIZE); 1619 if (res) 1620 goto out; 1621 else if (disc_resp->result != SMP_RESP_FUNC_ACC) { 1622 res = disc_resp->result; 1623 goto out; 1624 } 1625out: 1626 kfree(disc_req); 1627 return res; 1628} 1629 1630static int sas_get_phy_change_count(struct domain_device *dev, 1631 int phy_id, int *pcc) 1632{ 1633 int res; 1634 struct smp_resp *disc_resp; 1635 1636 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE); 1637 if (!disc_resp) 1638 return -ENOMEM; 1639 1640 res = sas_get_phy_discover(dev, phy_id, disc_resp); 1641 if (!res) 1642 *pcc = disc_resp->disc.change_count; 1643 1644 kfree(disc_resp); 1645 return res; 1646} 1647 1648static int sas_get_phy_attached_sas_addr(struct domain_device *dev, 1649 int phy_id, u8 *attached_sas_addr) 1650{ 1651 int res; 1652 struct smp_resp *disc_resp; 1653 struct discover_resp *dr; 1654 1655 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE); 1656 if (!disc_resp) 1657 return -ENOMEM; 1658 dr = &disc_resp->disc; 1659 1660 res = sas_get_phy_discover(dev, phy_id, disc_resp); 1661 if (!res) { 1662 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8); 1663 if (dr->attached_dev_type == 0) 1664 memset(attached_sas_addr, 0, 8); 1665 } 1666 kfree(disc_resp); 1667 return res; 1668} 1669 1670static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id, 1671 int from_phy, bool update) 1672{ 1673 struct expander_device *ex = &dev->ex_dev; 1674 int res = 0; 1675 int i; 1676 1677 for (i = from_phy; i < ex->num_phys; i++) { 1678 int phy_change_count = 0; 1679 1680 res = sas_get_phy_change_count(dev, i, &phy_change_count); 1681 if (res) 1682 goto out; 1683 else if (phy_change_count != ex->ex_phy[i].phy_change_count) { 1684 if (update) 1685 ex->ex_phy[i].phy_change_count = 1686 phy_change_count; 1687 *phy_id = i; 1688 return 0; 1689 } 1690 } 1691out: 1692 return res; 1693} 1694 1695static int sas_get_ex_change_count(struct domain_device *dev, int *ecc) 1696{ 1697 int res; 1698 u8 *rg_req; 1699 struct smp_resp *rg_resp; 1700 1701 rg_req = alloc_smp_req(RG_REQ_SIZE); 1702 if (!rg_req) 1703 return -ENOMEM; 1704 1705 rg_resp = alloc_smp_resp(RG_RESP_SIZE); 1706 if (!rg_resp) { 1707 kfree(rg_req); 1708 return -ENOMEM; 1709 } 1710 1711 rg_req[1] = SMP_REPORT_GENERAL; 1712 1713 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp, 1714 RG_RESP_SIZE); 1715 if (res) 1716 goto out; 1717 if (rg_resp->result != SMP_RESP_FUNC_ACC) { 1718 res = rg_resp->result; 1719 goto out; 1720 } 1721 1722 *ecc = be16_to_cpu(rg_resp->rg.change_count); 1723out: 1724 kfree(rg_resp); 1725 kfree(rg_req); 1726 return res; 1727} 1728/** 1729 * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE). 1730 * @dev:domain device to be detect. 1731 * @src_dev: the device which originated BROADCAST(CHANGE). 1732 * 1733 * Add self-configuration expander suport. Suppose two expander cascading, 1734 * when the first level expander is self-configuring, hotplug the disks in 1735 * second level expander, BROADCAST(CHANGE) will not only be originated 1736 * in the second level expander, but also be originated in the first level 1737 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say, 1738 * expander changed count in two level expanders will all increment at least 1739 * once, but the phy which chang count has changed is the source device which 1740 * we concerned. 1741 */ 1742 1743static int sas_find_bcast_dev(struct domain_device *dev, 1744 struct domain_device **src_dev) 1745{ 1746 struct expander_device *ex = &dev->ex_dev; 1747 int ex_change_count = -1; 1748 int phy_id = -1; 1749 int res; 1750 struct domain_device *ch; 1751 1752 res = sas_get_ex_change_count(dev, &ex_change_count); 1753 if (res) 1754 goto out; 1755 if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) { 1756 /* Just detect if this expander phys phy change count changed, 1757 * in order to determine if this expander originate BROADCAST, 1758 * and do not update phy change count field in our structure. 1759 */ 1760 res = sas_find_bcast_phy(dev, &phy_id, 0, false); 1761 if (phy_id != -1) { 1762 *src_dev = dev; 1763 ex->ex_change_count = ex_change_count; 1764 SAS_DPRINTK("Expander phy change count has changed\n"); 1765 return res; 1766 } else 1767 SAS_DPRINTK("Expander phys DID NOT change\n"); 1768 } 1769 list_for_each_entry(ch, &ex->children, siblings) { 1770 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) { 1771 res = sas_find_bcast_dev(ch, src_dev); 1772 if (*src_dev) 1773 return res; 1774 } 1775 } 1776out: 1777 return res; 1778} 1779 1780static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev) 1781{ 1782 struct expander_device *ex = &dev->ex_dev; 1783 struct domain_device *child, *n; 1784 1785 list_for_each_entry_safe(child, n, &ex->children, siblings) { 1786 set_bit(SAS_DEV_GONE, &child->state); 1787 if (child->dev_type == EDGE_DEV || 1788 child->dev_type == FANOUT_DEV) 1789 sas_unregister_ex_tree(port, child); 1790 else 1791 sas_unregister_dev(port, child); 1792 } 1793 sas_unregister_dev(port, dev); 1794} 1795 1796static void sas_unregister_devs_sas_addr(struct domain_device *parent, 1797 int phy_id, bool last) 1798{ 1799 struct expander_device *ex_dev = &parent->ex_dev; 1800 struct ex_phy *phy = &ex_dev->ex_phy[phy_id]; 1801 struct domain_device *child, *n; 1802 if (last) { 1803 list_for_each_entry_safe(child, n, 1804 &ex_dev->children, siblings) { 1805 if (SAS_ADDR(child->sas_addr) == 1806 SAS_ADDR(phy->attached_sas_addr)) { 1807 set_bit(SAS_DEV_GONE, &child->state); 1808 if (child->dev_type == EDGE_DEV || 1809 child->dev_type == FANOUT_DEV) 1810 sas_unregister_ex_tree(parent->port, child); 1811 else 1812 sas_unregister_dev(parent->port, child); 1813 break; 1814 } 1815 } 1816 set_bit(SAS_DEV_GONE, &parent->state); 1817 sas_disable_routing(parent, phy->attached_sas_addr); 1818 } 1819 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE); 1820 if (phy->port) { 1821 sas_port_delete_phy(phy->port, phy->phy); 1822 if (phy->port->num_phys == 0) 1823 sas_port_delete(phy->port); 1824 phy->port = NULL; 1825 } 1826} 1827 1828static int sas_discover_bfs_by_root_level(struct domain_device *root, 1829 const int level) 1830{ 1831 struct expander_device *ex_root = &root->ex_dev; 1832 struct domain_device *child; 1833 int res = 0; 1834 1835 list_for_each_entry(child, &ex_root->children, siblings) { 1836 if (child->dev_type == EDGE_DEV || 1837 child->dev_type == FANOUT_DEV) { 1838 struct sas_expander_device *ex = 1839 rphy_to_expander_device(child->rphy); 1840 1841 if (level > ex->level) 1842 res = sas_discover_bfs_by_root_level(child, 1843 level); 1844 else if (level == ex->level) 1845 res = sas_ex_discover_devices(child, -1); 1846 } 1847 } 1848 return res; 1849} 1850 1851static int sas_discover_bfs_by_root(struct domain_device *dev) 1852{ 1853 int res; 1854 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy); 1855 int level = ex->level+1; 1856 1857 res = sas_ex_discover_devices(dev, -1); 1858 if (res) 1859 goto out; 1860 do { 1861 res = sas_discover_bfs_by_root_level(dev, level); 1862 mb(); 1863 level += 1; 1864 } while (level <= dev->port->disc.max_level); 1865out: 1866 return res; 1867} 1868 1869static int sas_discover_new(struct domain_device *dev, int phy_id) 1870{ 1871 struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id]; 1872 struct domain_device *child; 1873 bool found = false; 1874 int res, i; 1875 1876 SAS_DPRINTK("ex %016llx phy%d new device attached\n", 1877 SAS_ADDR(dev->sas_addr), phy_id); 1878 res = sas_ex_phy_discover(dev, phy_id); 1879 if (res) 1880 goto out; 1881 /* to support the wide port inserted */ 1882 for (i = 0; i < dev->ex_dev.num_phys; i++) { 1883 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i]; 1884 if (i == phy_id) 1885 continue; 1886 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) == 1887 SAS_ADDR(ex_phy->attached_sas_addr)) { 1888 found = true; 1889 break; 1890 } 1891 } 1892 if (found) { 1893 sas_ex_join_wide_port(dev, phy_id); 1894 return 0; 1895 } 1896 res = sas_ex_discover_devices(dev, phy_id); 1897 if (!res) 1898 goto out; 1899 list_for_each_entry(child, &dev->ex_dev.children, siblings) { 1900 if (SAS_ADDR(child->sas_addr) == 1901 SAS_ADDR(ex_phy->attached_sas_addr)) { 1902 if (child->dev_type == EDGE_DEV || 1903 child->dev_type == FANOUT_DEV) 1904 res = sas_discover_bfs_by_root(child); 1905 break; 1906 } 1907 } 1908out: 1909 return res; 1910} 1911 1912static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last) 1913{ 1914 struct expander_device *ex = &dev->ex_dev; 1915 struct ex_phy *phy = &ex->ex_phy[phy_id]; 1916 u8 attached_sas_addr[8]; 1917 int res; 1918 1919 res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr); 1920 switch (res) { 1921 case SMP_RESP_NO_PHY: 1922 phy->phy_state = PHY_NOT_PRESENT; 1923 sas_unregister_devs_sas_addr(dev, phy_id, last); 1924 goto out; break; 1925 case SMP_RESP_PHY_VACANT: 1926 phy->phy_state = PHY_VACANT; 1927 sas_unregister_devs_sas_addr(dev, phy_id, last); 1928 goto out; break; 1929 case SMP_RESP_FUNC_ACC: 1930 break; 1931 } 1932 1933 if (SAS_ADDR(attached_sas_addr) == 0) { 1934 phy->phy_state = PHY_EMPTY; 1935 sas_unregister_devs_sas_addr(dev, phy_id, last); 1936 } else if (SAS_ADDR(attached_sas_addr) == 1937 SAS_ADDR(phy->attached_sas_addr)) { 1938 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n", 1939 SAS_ADDR(dev->sas_addr), phy_id); 1940 sas_ex_phy_discover(dev, phy_id); 1941 } else 1942 res = sas_discover_new(dev, phy_id); 1943out: 1944 return res; 1945} 1946 1947/** 1948 * sas_rediscover - revalidate the domain. 1949 * @dev:domain device to be detect. 1950 * @phy_id: the phy id will be detected. 1951 * 1952 * NOTE: this process _must_ quit (return) as soon as any connection 1953 * errors are encountered. Connection recovery is done elsewhere. 1954 * Discover process only interrogates devices in order to discover the 1955 * domain.For plugging out, we un-register the device only when it is 1956 * the last phy in the port, for other phys in this port, we just delete it 1957 * from the port.For inserting, we do discovery when it is the 1958 * first phy,for other phys in this port, we add it to the port to 1959 * forming the wide-port. 1960 */ 1961static int sas_rediscover(struct domain_device *dev, const int phy_id) 1962{ 1963 struct expander_device *ex = &dev->ex_dev; 1964 struct ex_phy *changed_phy = &ex->ex_phy[phy_id]; 1965 int res = 0; 1966 int i; 1967 bool last = true; /* is this the last phy of the port */ 1968 1969 SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n", 1970 SAS_ADDR(dev->sas_addr), phy_id); 1971 1972 if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) { 1973 for (i = 0; i < ex->num_phys; i++) { 1974 struct ex_phy *phy = &ex->ex_phy[i]; 1975 1976 if (i == phy_id) 1977 continue; 1978 if (SAS_ADDR(phy->attached_sas_addr) == 1979 SAS_ADDR(changed_phy->attached_sas_addr)) { 1980 SAS_DPRINTK("phy%d part of wide port with " 1981 "phy%d\n", phy_id, i); 1982 last = false; 1983 break; 1984 } 1985 } 1986 res = sas_rediscover_dev(dev, phy_id, last); 1987 } else 1988 res = sas_discover_new(dev, phy_id); 1989 return res; 1990} 1991 1992/** 1993 * sas_revalidate_domain -- revalidate the domain 1994 * @port: port to the domain of interest 1995 * 1996 * NOTE: this process _must_ quit (return) as soon as any connection 1997 * errors are encountered. Connection recovery is done elsewhere. 1998 * Discover process only interrogates devices in order to discover the 1999 * domain. 2000 */ 2001int sas_ex_revalidate_domain(struct domain_device *port_dev) 2002{ 2003 int res; 2004 struct domain_device *dev = NULL; 2005 2006 res = sas_find_bcast_dev(port_dev, &dev); 2007 if (res) 2008 goto out; 2009 if (dev) { 2010 struct expander_device *ex = &dev->ex_dev; 2011 int i = 0, phy_id; 2012 2013 do { 2014 phy_id = -1; 2015 res = sas_find_bcast_phy(dev, &phy_id, i, true); 2016 if (phy_id == -1) 2017 break; 2018 res = sas_rediscover(dev, phy_id); 2019 i = phy_id + 1; 2020 } while (i < ex->num_phys); 2021 } 2022out: 2023 return res; 2024} 2025 2026int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy, 2027 struct request *req) 2028{ 2029 struct domain_device *dev; 2030 int ret, type; 2031 struct request *rsp = req->next_rq; 2032 2033 if (!rsp) { 2034 printk("%s: space for a smp response is missing\n", 2035 __func__); 2036 return -EINVAL; 2037 } 2038 2039 /* no rphy means no smp target support (ie aic94xx host) */ 2040 if (!rphy) 2041 return sas_smp_host_handler(shost, req, rsp); 2042 2043 type = rphy->identify.device_type; 2044 2045 if (type != SAS_EDGE_EXPANDER_DEVICE && 2046 type != SAS_FANOUT_EXPANDER_DEVICE) { 2047 printk("%s: can we send a smp request to a device?\n", 2048 __func__); 2049 return -EINVAL; 2050 } 2051 2052 dev = sas_find_dev_by_rphy(rphy); 2053 if (!dev) { 2054 printk("%s: fail to find a domain_device?\n", __func__); 2055 return -EINVAL; 2056 } 2057 2058 /* do we need to support multiple segments? */ 2059 if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) { 2060 printk("%s: multiple segments req %u %u, rsp %u %u\n", 2061 __func__, req->bio->bi_vcnt, blk_rq_bytes(req), 2062 rsp->bio->bi_vcnt, blk_rq_bytes(rsp)); 2063 return -EINVAL; 2064 } 2065 2066 ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req), 2067 bio_data(rsp->bio), blk_rq_bytes(rsp)); 2068 if (ret > 0) { 2069 /* positive number is the untransferred residual */ 2070 rsp->resid_len = ret; 2071 req->resid_len = 0; 2072 ret = 0; 2073 } else if (ret == 0) { 2074 rsp->resid_len = 0; 2075 req->resid_len = 0; 2076 } 2077 2078 return ret; 2079} 2080