2179 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Serial Attached SCSI (SAS) Expander discovery and configuration4 *5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>7 *8 * This file is licensed under GPLv2.9 */10 11#include <linux/scatterlist.h>12#include <linux/blkdev.h>13#include <linux/slab.h>14#include <linux/unaligned.h>15 16#include "sas_internal.h"17 18#include <scsi/sas_ata.h>19#include <scsi/scsi_transport.h>20#include <scsi/scsi_transport_sas.h>21#include "scsi_sas_internal.h"22 23static int sas_discover_expander(struct domain_device *dev);24static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);25static int sas_configure_phy(struct domain_device *dev, int phy_id,26 u8 *sas_addr, int include);27static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr);28 29static void sas_port_add_ex_phy(struct sas_port *port, struct ex_phy *ex_phy)30{31 sas_port_add_phy(port, ex_phy->phy);32 ex_phy->port = port;33 ex_phy->phy_state = PHY_DEVICE_DISCOVERED;34}35 36static void sas_ex_add_parent_port(struct domain_device *dev, int phy_id)37{38 struct expander_device *ex = &dev->ex_dev;39 struct ex_phy *ex_phy = &ex->ex_phy[phy_id];40 41 if (!ex->parent_port) {42 ex->parent_port = sas_port_alloc(&dev->rphy->dev, phy_id);43 /* FIXME: error handling */44 BUG_ON(!ex->parent_port);45 BUG_ON(sas_port_add(ex->parent_port));46 sas_port_mark_backlink(ex->parent_port);47 }48 sas_port_add_ex_phy(ex->parent_port, ex_phy);49}50 51/* ---------- SMP task management ---------- */52 53/* Give it some long enough timeout. In seconds. */54#define SMP_TIMEOUT 1055 56static int smp_execute_task_sg(struct domain_device *dev,57 struct scatterlist *req, struct scatterlist *resp)58{59 int res, retry;60 struct sas_task *task = NULL;61 struct sas_internal *i =62 to_sas_internal(dev->port->ha->shost->transportt);63 struct sas_ha_struct *ha = dev->port->ha;64 65 pm_runtime_get_sync(ha->dev);66 mutex_lock(&dev->ex_dev.cmd_mutex);67 for (retry = 0; retry < 3; retry++) {68 if (test_bit(SAS_DEV_GONE, &dev->state)) {69 res = -ECOMM;70 break;71 }72 73 task = sas_alloc_slow_task(GFP_KERNEL);74 if (!task) {75 res = -ENOMEM;76 break;77 }78 task->dev = dev;79 task->task_proto = dev->tproto;80 task->smp_task.smp_req = *req;81 task->smp_task.smp_resp = *resp;82 83 task->task_done = sas_task_internal_done;84 85 task->slow_task->timer.function = sas_task_internal_timedout;86 task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;87 add_timer(&task->slow_task->timer);88 89 res = i->dft->lldd_execute_task(task, GFP_KERNEL);90 91 if (res) {92 del_timer_sync(&task->slow_task->timer);93 pr_notice("executing SMP task failed:%d\n", res);94 break;95 }96 97 wait_for_completion(&task->slow_task->completion);98 res = -ECOMM;99 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {100 pr_notice("smp task timed out or aborted\n");101 i->dft->lldd_abort_task(task);102 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {103 pr_notice("SMP task aborted and not done\n");104 break;105 }106 }107 if (task->task_status.resp == SAS_TASK_COMPLETE &&108 task->task_status.stat == SAS_SAM_STAT_GOOD) {109 res = 0;110 break;111 }112 if (task->task_status.resp == SAS_TASK_COMPLETE &&113 task->task_status.stat == SAS_DATA_UNDERRUN) {114 /* no error, but return the number of bytes of115 * underrun */116 res = task->task_status.residual;117 break;118 }119 if (task->task_status.resp == SAS_TASK_COMPLETE &&120 task->task_status.stat == SAS_DATA_OVERRUN) {121 res = -EMSGSIZE;122 break;123 }124 if (task->task_status.resp == SAS_TASK_UNDELIVERED &&125 task->task_status.stat == SAS_DEVICE_UNKNOWN)126 break;127 else {128 pr_notice("%s: task to dev %016llx response: 0x%x status 0x%x\n",129 __func__,130 SAS_ADDR(dev->sas_addr),131 task->task_status.resp,132 task->task_status.stat);133 sas_free_task(task);134 task = NULL;135 }136 }137 mutex_unlock(&dev->ex_dev.cmd_mutex);138 pm_runtime_put_sync(ha->dev);139 140 BUG_ON(retry == 3 && task != NULL);141 sas_free_task(task);142 return res;143}144 145static int smp_execute_task(struct domain_device *dev, void *req, int req_size,146 void *resp, int resp_size)147{148 struct scatterlist req_sg;149 struct scatterlist resp_sg;150 151 sg_init_one(&req_sg, req, req_size);152 sg_init_one(&resp_sg, resp, resp_size);153 return smp_execute_task_sg(dev, &req_sg, &resp_sg);154}155 156/* ---------- Allocations ---------- */157 158static inline void *alloc_smp_req(int size)159{160 u8 *p = kzalloc(ALIGN(size, ARCH_DMA_MINALIGN), GFP_KERNEL);161 if (p)162 p[0] = SMP_REQUEST;163 return p;164}165 166static inline void *alloc_smp_resp(int size)167{168 return kzalloc(size, GFP_KERNEL);169}170 171static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)172{173 switch (phy->routing_attr) {174 case TABLE_ROUTING:175 if (dev->ex_dev.t2t_supp)176 return 'U';177 else178 return 'T';179 case DIRECT_ROUTING:180 return 'D';181 case SUBTRACTIVE_ROUTING:182 return 'S';183 default:184 return '?';185 }186}187 188static enum sas_device_type to_dev_type(struct discover_resp *dr)189{190 /* This is detecting a failure to transmit initial dev to host191 * FIS as described in section J.5 of sas-2 r16192 */193 if (dr->attached_dev_type == SAS_PHY_UNUSED && dr->attached_sata_dev &&194 dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)195 return SAS_SATA_PENDING;196 else197 return dr->attached_dev_type;198}199 200static void sas_set_ex_phy(struct domain_device *dev, int phy_id,201 struct smp_disc_resp *disc_resp)202{203 enum sas_device_type dev_type;204 enum sas_linkrate linkrate;205 u8 sas_addr[SAS_ADDR_SIZE];206 struct discover_resp *dr = &disc_resp->disc;207 struct sas_ha_struct *ha = dev->port->ha;208 struct expander_device *ex = &dev->ex_dev;209 struct ex_phy *phy = &ex->ex_phy[phy_id];210 struct sas_rphy *rphy = dev->rphy;211 bool new_phy = !phy->phy;212 char *type;213 214 if (new_phy) {215 if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))216 return;217 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);218 219 /* FIXME: error_handling */220 BUG_ON(!phy->phy);221 }222 223 switch (disc_resp->result) {224 case SMP_RESP_PHY_VACANT:225 phy->phy_state = PHY_VACANT;226 break;227 default:228 phy->phy_state = PHY_NOT_PRESENT;229 break;230 case SMP_RESP_FUNC_ACC:231 phy->phy_state = PHY_EMPTY; /* do not know yet */232 break;233 }234 235 /* check if anything important changed to squelch debug */236 dev_type = phy->attached_dev_type;237 linkrate = phy->linkrate;238 memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);239 240 /* Handle vacant phy - rest of dr data is not valid so skip it */241 if (phy->phy_state == PHY_VACANT) {242 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);243 phy->attached_dev_type = SAS_PHY_UNUSED;244 if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {245 phy->phy_id = phy_id;246 goto skip;247 } else248 goto out;249 }250 251 phy->attached_dev_type = to_dev_type(dr);252 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))253 goto out;254 phy->phy_id = phy_id;255 phy->linkrate = dr->linkrate;256 phy->attached_sata_host = dr->attached_sata_host;257 phy->attached_sata_dev = dr->attached_sata_dev;258 phy->attached_sata_ps = dr->attached_sata_ps;259 phy->attached_iproto = dr->iproto << 1;260 phy->attached_tproto = dr->tproto << 1;261 /* help some expanders that fail to zero sas_address in the 'no262 * device' case263 */264 if (phy->attached_dev_type == SAS_PHY_UNUSED)265 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);266 else267 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);268 phy->attached_phy_id = dr->attached_phy_id;269 phy->phy_change_count = dr->change_count;270 phy->routing_attr = dr->routing_attr;271 phy->virtual = dr->virtual;272 phy->last_da_index = -1;273 274 phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);275 phy->phy->identify.device_type = dr->attached_dev_type;276 phy->phy->identify.initiator_port_protocols = phy->attached_iproto;277 phy->phy->identify.target_port_protocols = phy->attached_tproto;278 if (!phy->attached_tproto && dr->attached_sata_dev)279 phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;280 phy->phy->identify.phy_identifier = phy_id;281 phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;282 phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;283 phy->phy->minimum_linkrate = dr->pmin_linkrate;284 phy->phy->maximum_linkrate = dr->pmax_linkrate;285 phy->phy->negotiated_linkrate = phy->linkrate;286 phy->phy->enabled = (phy->linkrate != SAS_PHY_DISABLED);287 288 skip:289 if (new_phy)290 if (sas_phy_add(phy->phy)) {291 sas_phy_free(phy->phy);292 return;293 }294 295 out:296 switch (phy->attached_dev_type) {297 case SAS_SATA_PENDING:298 type = "stp pending";299 break;300 case SAS_PHY_UNUSED:301 type = "no device";302 break;303 case SAS_END_DEVICE:304 if (phy->attached_iproto) {305 if (phy->attached_tproto)306 type = "host+target";307 else308 type = "host";309 } else {310 if (dr->attached_sata_dev)311 type = "stp";312 else313 type = "ssp";314 }315 break;316 case SAS_EDGE_EXPANDER_DEVICE:317 case SAS_FANOUT_EXPANDER_DEVICE:318 type = "smp";319 break;320 default:321 type = "unknown";322 }323 324 /* this routine is polled by libata error recovery so filter325 * unimportant messages326 */327 if (new_phy || phy->attached_dev_type != dev_type ||328 phy->linkrate != linkrate ||329 SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))330 /* pass */;331 else332 return;333 334 /* if the attached device type changed and ata_eh is active,335 * make sure we run revalidation when eh completes (see:336 * sas_enable_revalidation)337 */338 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))339 set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);340 341 pr_debug("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",342 test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",343 SAS_ADDR(dev->sas_addr), phy->phy_id,344 sas_route_char(dev, phy), phy->linkrate,345 SAS_ADDR(phy->attached_sas_addr), type);346}347 348/* check if we have an existing attached ata device on this expander phy */349struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)350{351 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];352 struct domain_device *dev;353 struct sas_rphy *rphy;354 355 if (!ex_phy->port)356 return NULL;357 358 rphy = ex_phy->port->rphy;359 if (!rphy)360 return NULL;361 362 dev = sas_find_dev_by_rphy(rphy);363 364 if (dev && dev_is_sata(dev))365 return dev;366 367 return NULL;368}369 370#define DISCOVER_REQ_SIZE 16371#define DISCOVER_RESP_SIZE sizeof(struct smp_disc_resp)372 373static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,374 struct smp_disc_resp *disc_resp,375 int single)376{377 struct discover_resp *dr = &disc_resp->disc;378 int res;379 380 disc_req[9] = single;381 382 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,383 disc_resp, DISCOVER_RESP_SIZE);384 if (res)385 return res;386 if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {387 pr_notice("Found loopback topology, just ignore it!\n");388 return 0;389 }390 sas_set_ex_phy(dev, single, disc_resp);391 return 0;392}393 394int sas_ex_phy_discover(struct domain_device *dev, int single)395{396 struct expander_device *ex = &dev->ex_dev;397 int res = 0;398 u8 *disc_req;399 struct smp_disc_resp *disc_resp;400 401 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);402 if (!disc_req)403 return -ENOMEM;404 405 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);406 if (!disc_resp) {407 kfree(disc_req);408 return -ENOMEM;409 }410 411 disc_req[1] = SMP_DISCOVER;412 413 if (0 <= single && single < ex->num_phys) {414 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);415 } else {416 int i;417 418 for (i = 0; i < ex->num_phys; i++) {419 res = sas_ex_phy_discover_helper(dev, disc_req,420 disc_resp, i);421 if (res)422 goto out_err;423 }424 }425out_err:426 kfree(disc_resp);427 kfree(disc_req);428 return res;429}430 431static int sas_expander_discover(struct domain_device *dev)432{433 struct expander_device *ex = &dev->ex_dev;434 int res;435 436 ex->ex_phy = kcalloc(ex->num_phys, sizeof(*ex->ex_phy), GFP_KERNEL);437 if (!ex->ex_phy)438 return -ENOMEM;439 440 res = sas_ex_phy_discover(dev, -1);441 if (res)442 goto out_err;443 444 return 0;445 out_err:446 kfree(ex->ex_phy);447 ex->ex_phy = NULL;448 return res;449}450 451#define MAX_EXPANDER_PHYS 128452 453#define RG_REQ_SIZE 8454#define RG_RESP_SIZE sizeof(struct smp_rg_resp)455 456static int sas_ex_general(struct domain_device *dev)457{458 u8 *rg_req;459 struct smp_rg_resp *rg_resp;460 struct report_general_resp *rg;461 int res;462 int i;463 464 rg_req = alloc_smp_req(RG_REQ_SIZE);465 if (!rg_req)466 return -ENOMEM;467 468 rg_resp = alloc_smp_resp(RG_RESP_SIZE);469 if (!rg_resp) {470 kfree(rg_req);471 return -ENOMEM;472 }473 474 rg_req[1] = SMP_REPORT_GENERAL;475 476 for (i = 0; i < 5; i++) {477 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,478 RG_RESP_SIZE);479 480 if (res) {481 pr_notice("RG to ex %016llx failed:0x%x\n",482 SAS_ADDR(dev->sas_addr), res);483 goto out;484 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {485 pr_debug("RG:ex %016llx returned SMP result:0x%x\n",486 SAS_ADDR(dev->sas_addr), rg_resp->result);487 res = rg_resp->result;488 goto out;489 }490 491 rg = &rg_resp->rg;492 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);493 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);494 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);495 dev->ex_dev.t2t_supp = rg->t2t_supp;496 dev->ex_dev.conf_route_table = rg->conf_route_table;497 dev->ex_dev.configuring = rg->configuring;498 memcpy(dev->ex_dev.enclosure_logical_id,499 rg->enclosure_logical_id, 8);500 501 if (dev->ex_dev.configuring) {502 pr_debug("RG: ex %016llx self-configuring...\n",503 SAS_ADDR(dev->sas_addr));504 schedule_timeout_interruptible(5*HZ);505 } else506 break;507 }508out:509 kfree(rg_req);510 kfree(rg_resp);511 return res;512}513 514static void ex_assign_manuf_info(struct domain_device *dev, void515 *_mi_resp)516{517 u8 *mi_resp = _mi_resp;518 struct sas_rphy *rphy = dev->rphy;519 struct sas_expander_device *edev = rphy_to_expander_device(rphy);520 521 memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);522 memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);523 memcpy(edev->product_rev, mi_resp + 36,524 SAS_EXPANDER_PRODUCT_REV_LEN);525 526 if (mi_resp[8] & 1) {527 memcpy(edev->component_vendor_id, mi_resp + 40,528 SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);529 edev->component_id = mi_resp[48] << 8 | mi_resp[49];530 edev->component_revision_id = mi_resp[50];531 }532}533 534#define MI_REQ_SIZE 8535#define MI_RESP_SIZE 64536 537static int sas_ex_manuf_info(struct domain_device *dev)538{539 u8 *mi_req;540 u8 *mi_resp;541 int res;542 543 mi_req = alloc_smp_req(MI_REQ_SIZE);544 if (!mi_req)545 return -ENOMEM;546 547 mi_resp = alloc_smp_resp(MI_RESP_SIZE);548 if (!mi_resp) {549 kfree(mi_req);550 return -ENOMEM;551 }552 553 mi_req[1] = SMP_REPORT_MANUF_INFO;554 555 res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp, MI_RESP_SIZE);556 if (res) {557 pr_notice("MI: ex %016llx failed:0x%x\n",558 SAS_ADDR(dev->sas_addr), res);559 goto out;560 } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {561 pr_debug("MI ex %016llx returned SMP result:0x%x\n",562 SAS_ADDR(dev->sas_addr), mi_resp[2]);563 goto out;564 }565 566 ex_assign_manuf_info(dev, mi_resp);567out:568 kfree(mi_req);569 kfree(mi_resp);570 return res;571}572 573#define PC_REQ_SIZE 44574#define PC_RESP_SIZE 8575 576int sas_smp_phy_control(struct domain_device *dev, int phy_id,577 enum phy_func phy_func,578 struct sas_phy_linkrates *rates)579{580 u8 *pc_req;581 u8 *pc_resp;582 int res;583 584 pc_req = alloc_smp_req(PC_REQ_SIZE);585 if (!pc_req)586 return -ENOMEM;587 588 pc_resp = alloc_smp_resp(PC_RESP_SIZE);589 if (!pc_resp) {590 kfree(pc_req);591 return -ENOMEM;592 }593 594 pc_req[1] = SMP_PHY_CONTROL;595 pc_req[9] = phy_id;596 pc_req[10] = phy_func;597 if (rates) {598 pc_req[32] = rates->minimum_linkrate << 4;599 pc_req[33] = rates->maximum_linkrate << 4;600 }601 602 res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp, PC_RESP_SIZE);603 if (res) {604 pr_err("ex %016llx phy%02d PHY control failed: %d\n",605 SAS_ADDR(dev->sas_addr), phy_id, res);606 } else if (pc_resp[2] != SMP_RESP_FUNC_ACC) {607 pr_err("ex %016llx phy%02d PHY control failed: function result 0x%x\n",608 SAS_ADDR(dev->sas_addr), phy_id, pc_resp[2]);609 res = pc_resp[2];610 }611 kfree(pc_resp);612 kfree(pc_req);613 return res;614}615 616static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)617{618 struct expander_device *ex = &dev->ex_dev;619 struct ex_phy *phy = &ex->ex_phy[phy_id];620 621 sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);622 phy->linkrate = SAS_PHY_DISABLED;623}624 625static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)626{627 struct expander_device *ex = &dev->ex_dev;628 int i;629 630 for (i = 0; i < ex->num_phys; i++) {631 struct ex_phy *phy = &ex->ex_phy[i];632 633 if (phy->phy_state == PHY_VACANT ||634 phy->phy_state == PHY_NOT_PRESENT)635 continue;636 637 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))638 sas_ex_disable_phy(dev, i);639 }640}641 642static int sas_dev_present_in_domain(struct asd_sas_port *port,643 u8 *sas_addr)644{645 struct domain_device *dev;646 647 if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))648 return 1;649 list_for_each_entry(dev, &port->dev_list, dev_list_node) {650 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))651 return 1;652 }653 return 0;654}655 656#define RPEL_REQ_SIZE 16657#define RPEL_RESP_SIZE 32658int sas_smp_get_phy_events(struct sas_phy *phy)659{660 int res;661 u8 *req;662 u8 *resp;663 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);664 struct domain_device *dev = sas_find_dev_by_rphy(rphy);665 666 req = alloc_smp_req(RPEL_REQ_SIZE);667 if (!req)668 return -ENOMEM;669 670 resp = alloc_smp_resp(RPEL_RESP_SIZE);671 if (!resp) {672 kfree(req);673 return -ENOMEM;674 }675 676 req[1] = SMP_REPORT_PHY_ERR_LOG;677 req[9] = phy->number;678 679 res = smp_execute_task(dev, req, RPEL_REQ_SIZE,680 resp, RPEL_RESP_SIZE);681 682 if (res)683 goto out;684 685 phy->invalid_dword_count = get_unaligned_be32(&resp[12]);686 phy->running_disparity_error_count = get_unaligned_be32(&resp[16]);687 phy->loss_of_dword_sync_count = get_unaligned_be32(&resp[20]);688 phy->phy_reset_problem_count = get_unaligned_be32(&resp[24]);689 690 out:691 kfree(req);692 kfree(resp);693 return res;694 695}696 697#ifdef CONFIG_SCSI_SAS_ATA698 699#define RPS_REQ_SIZE 16700#define RPS_RESP_SIZE sizeof(struct smp_rps_resp)701 702int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,703 struct smp_rps_resp *rps_resp)704{705 int res;706 u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);707 u8 *resp = (u8 *)rps_resp;708 709 if (!rps_req)710 return -ENOMEM;711 712 rps_req[1] = SMP_REPORT_PHY_SATA;713 rps_req[9] = phy_id;714 715 res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,716 rps_resp, RPS_RESP_SIZE);717 718 /* 0x34 is the FIS type for the D2H fis. There's a potential719 * standards cockup here. sas-2 explicitly specifies the FIS720 * should be encoded so that FIS type is in resp[24].721 * However, some expanders endian reverse this. Undo the722 * reversal here */723 if (!res && resp[27] == 0x34 && resp[24] != 0x34) {724 int i;725 726 for (i = 0; i < 5; i++) {727 int j = 24 + (i*4);728 u8 a, b;729 a = resp[j + 0];730 b = resp[j + 1];731 resp[j + 0] = resp[j + 3];732 resp[j + 1] = resp[j + 2];733 resp[j + 2] = b;734 resp[j + 3] = a;735 }736 }737 738 kfree(rps_req);739 return res;740}741#endif742 743static void sas_ex_get_linkrate(struct domain_device *parent,744 struct domain_device *child,745 struct ex_phy *parent_phy)746{747 struct expander_device *parent_ex = &parent->ex_dev;748 struct sas_port *port;749 int i;750 751 child->pathways = 0;752 753 port = parent_phy->port;754 755 for (i = 0; i < parent_ex->num_phys; i++) {756 struct ex_phy *phy = &parent_ex->ex_phy[i];757 758 if (phy->phy_state == PHY_VACANT ||759 phy->phy_state == PHY_NOT_PRESENT)760 continue;761 762 if (sas_phy_match_dev_addr(child, phy)) {763 child->min_linkrate = min(parent->min_linkrate,764 phy->linkrate);765 child->max_linkrate = max(parent->max_linkrate,766 phy->linkrate);767 child->pathways++;768 sas_port_add_phy(port, phy->phy);769 }770 }771 child->linkrate = min(parent_phy->linkrate, child->max_linkrate);772 child->pathways = min(child->pathways, parent->pathways);773}774 775static int sas_ex_add_dev(struct domain_device *parent, struct ex_phy *phy,776 struct domain_device *child, int phy_id)777{778 struct sas_rphy *rphy;779 int res;780 781 child->dev_type = SAS_END_DEVICE;782 rphy = sas_end_device_alloc(phy->port);783 if (!rphy)784 return -ENOMEM;785 786 child->tproto = phy->attached_tproto;787 sas_init_dev(child);788 789 child->rphy = rphy;790 get_device(&rphy->dev);791 rphy->identify.phy_identifier = phy_id;792 sas_fill_in_rphy(child, rphy);793 794 list_add_tail(&child->disco_list_node, &parent->port->disco_list);795 796 res = sas_notify_lldd_dev_found(child);797 if (res) {798 pr_notice("notify lldd for device %016llx at %016llx:%02d returned 0x%x\n",799 SAS_ADDR(child->sas_addr),800 SAS_ADDR(parent->sas_addr), phy_id, res);801 sas_rphy_free(child->rphy);802 list_del(&child->disco_list_node);803 return res;804 }805 806 return 0;807}808 809static struct domain_device *sas_ex_discover_end_dev(810 struct domain_device *parent, int phy_id)811{812 struct expander_device *parent_ex = &parent->ex_dev;813 struct ex_phy *phy = &parent_ex->ex_phy[phy_id];814 struct domain_device *child = NULL;815 int res;816 817 if (phy->attached_sata_host || phy->attached_sata_ps)818 return NULL;819 820 child = sas_alloc_device();821 if (!child)822 return NULL;823 824 kref_get(&parent->kref);825 child->parent = parent;826 child->port = parent->port;827 child->iproto = phy->attached_iproto;828 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);829 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);830 if (!phy->port) {831 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);832 if (unlikely(!phy->port))833 goto out_err;834 if (unlikely(sas_port_add(phy->port) != 0)) {835 sas_port_free(phy->port);836 goto out_err;837 }838 }839 sas_ex_get_linkrate(parent, child, phy);840 sas_device_set_phy(child, phy->port);841 842 if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {843 res = sas_ata_add_dev(parent, phy, child, phy_id);844 } else if (phy->attached_tproto & SAS_PROTOCOL_SSP) {845 res = sas_ex_add_dev(parent, phy, child, phy_id);846 } else {847 pr_notice("target proto 0x%x at %016llx:0x%x not handled\n",848 phy->attached_tproto, SAS_ADDR(parent->sas_addr),849 phy_id);850 res = -ENODEV;851 }852 853 if (res)854 goto out_free;855 856 list_add_tail(&child->siblings, &parent_ex->children);857 return child;858 859 out_free:860 sas_port_delete(phy->port);861 out_err:862 phy->port = NULL;863 sas_put_device(child);864 return NULL;865}866 867/* See if this phy is part of a wide port */868static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)869{870 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];871 int i;872 873 for (i = 0; i < parent->ex_dev.num_phys; i++) {874 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];875 876 if (ephy == phy)877 continue;878 879 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,880 SAS_ADDR_SIZE) && ephy->port) {881 sas_port_add_ex_phy(ephy->port, phy);882 return true;883 }884 }885 886 return false;887}888 889static struct domain_device *sas_ex_discover_expander(890 struct domain_device *parent, int phy_id)891{892 struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);893 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];894 struct domain_device *child = NULL;895 struct sas_rphy *rphy;896 struct sas_expander_device *edev;897 struct asd_sas_port *port;898 int res;899 900 if (phy->routing_attr == DIRECT_ROUTING) {901 pr_warn("ex %016llx:%02d:D <--> ex %016llx:0x%x is not allowed\n",902 SAS_ADDR(parent->sas_addr), phy_id,903 SAS_ADDR(phy->attached_sas_addr),904 phy->attached_phy_id);905 return NULL;906 }907 child = sas_alloc_device();908 if (!child)909 return NULL;910 911 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);912 /* FIXME: better error handling */913 BUG_ON(sas_port_add(phy->port) != 0);914 915 916 switch (phy->attached_dev_type) {917 case SAS_EDGE_EXPANDER_DEVICE:918 rphy = sas_expander_alloc(phy->port,919 SAS_EDGE_EXPANDER_DEVICE);920 break;921 case SAS_FANOUT_EXPANDER_DEVICE:922 rphy = sas_expander_alloc(phy->port,923 SAS_FANOUT_EXPANDER_DEVICE);924 break;925 default:926 rphy = NULL; /* shut gcc up */927 BUG();928 }929 port = parent->port;930 child->rphy = rphy;931 get_device(&rphy->dev);932 edev = rphy_to_expander_device(rphy);933 child->dev_type = phy->attached_dev_type;934 kref_get(&parent->kref);935 child->parent = parent;936 child->port = port;937 child->iproto = phy->attached_iproto;938 child->tproto = phy->attached_tproto;939 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);940 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);941 sas_ex_get_linkrate(parent, child, phy);942 edev->level = parent_ex->level + 1;943 parent->port->disc.max_level = max(parent->port->disc.max_level,944 edev->level);945 sas_init_dev(child);946 sas_fill_in_rphy(child, rphy);947 sas_rphy_add(rphy);948 949 spin_lock_irq(&parent->port->dev_list_lock);950 list_add_tail(&child->dev_list_node, &parent->port->dev_list);951 spin_unlock_irq(&parent->port->dev_list_lock);952 953 res = sas_discover_expander(child);954 if (res) {955 sas_rphy_delete(rphy);956 spin_lock_irq(&parent->port->dev_list_lock);957 list_del(&child->dev_list_node);958 spin_unlock_irq(&parent->port->dev_list_lock);959 sas_put_device(child);960 sas_port_delete(phy->port);961 phy->port = NULL;962 return NULL;963 }964 list_add_tail(&child->siblings, &parent->ex_dev.children);965 return child;966}967 968static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)969{970 struct expander_device *ex = &dev->ex_dev;971 struct ex_phy *ex_phy = &ex->ex_phy[phy_id];972 struct domain_device *child = NULL;973 int res = 0;974 975 /* Phy state */976 if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {977 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))978 res = sas_ex_phy_discover(dev, phy_id);979 if (res)980 return res;981 }982 983 /* Parent and domain coherency */984 if (!dev->parent && sas_phy_match_port_addr(dev->port, ex_phy)) {985 sas_ex_add_parent_port(dev, phy_id);986 return 0;987 }988 if (dev->parent && sas_phy_match_dev_addr(dev->parent, ex_phy)) {989 sas_ex_add_parent_port(dev, phy_id);990 if (ex_phy->routing_attr == TABLE_ROUTING)991 sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);992 return 0;993 }994 995 if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))996 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);997 998 if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {999 if (ex_phy->routing_attr == DIRECT_ROUTING) {1000 memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);1001 sas_configure_routing(dev, ex_phy->attached_sas_addr);1002 }1003 return 0;1004 } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)1005 return 0;1006 1007 if (ex_phy->attached_dev_type != SAS_END_DEVICE &&1008 ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&1009 ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&1010 ex_phy->attached_dev_type != SAS_SATA_PENDING) {1011 pr_warn("unknown device type(0x%x) attached to ex %016llx phy%02d\n",1012 ex_phy->attached_dev_type,1013 SAS_ADDR(dev->sas_addr),1014 phy_id);1015 return 0;1016 }1017 1018 res = sas_configure_routing(dev, ex_phy->attached_sas_addr);1019 if (res) {1020 pr_notice("configure routing for dev %016llx reported 0x%x. Forgotten\n",1021 SAS_ADDR(ex_phy->attached_sas_addr), res);1022 sas_disable_routing(dev, ex_phy->attached_sas_addr);1023 return res;1024 }1025 1026 if (sas_ex_join_wide_port(dev, phy_id)) {1027 pr_debug("Attaching ex phy%02d to wide port %016llx\n",1028 phy_id, SAS_ADDR(ex_phy->attached_sas_addr));1029 return res;1030 }1031 1032 switch (ex_phy->attached_dev_type) {1033 case SAS_END_DEVICE:1034 case SAS_SATA_PENDING:1035 child = sas_ex_discover_end_dev(dev, phy_id);1036 break;1037 case SAS_FANOUT_EXPANDER_DEVICE:1038 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {1039 pr_debug("second fanout expander %016llx phy%02d attached to ex %016llx phy%02d\n",1040 SAS_ADDR(ex_phy->attached_sas_addr),1041 ex_phy->attached_phy_id,1042 SAS_ADDR(dev->sas_addr),1043 phy_id);1044 sas_ex_disable_phy(dev, phy_id);1045 return res;1046 } else1047 memcpy(dev->port->disc.fanout_sas_addr,1048 ex_phy->attached_sas_addr, SAS_ADDR_SIZE);1049 fallthrough;1050 case SAS_EDGE_EXPANDER_DEVICE:1051 child = sas_ex_discover_expander(dev, phy_id);1052 break;1053 default:1054 break;1055 }1056 1057 if (!child)1058 pr_notice("ex %016llx phy%02d failed to discover\n",1059 SAS_ADDR(dev->sas_addr), phy_id);1060 return res;1061}1062 1063static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)1064{1065 struct expander_device *ex = &dev->ex_dev;1066 int i;1067 1068 for (i = 0; i < ex->num_phys; i++) {1069 struct ex_phy *phy = &ex->ex_phy[i];1070 1071 if (phy->phy_state == PHY_VACANT ||1072 phy->phy_state == PHY_NOT_PRESENT)1073 continue;1074 1075 if (dev_is_expander(phy->attached_dev_type) &&1076 phy->routing_attr == SUBTRACTIVE_ROUTING) {1077 1078 memcpy(sub_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);1079 1080 return 1;1081 }1082 }1083 return 0;1084}1085 1086static int sas_check_level_subtractive_boundary(struct domain_device *dev)1087{1088 struct expander_device *ex = &dev->ex_dev;1089 struct domain_device *child;1090 u8 sub_addr[SAS_ADDR_SIZE] = {0, };1091 1092 list_for_each_entry(child, &ex->children, siblings) {1093 if (!dev_is_expander(child->dev_type))1094 continue;1095 if (sub_addr[0] == 0) {1096 sas_find_sub_addr(child, sub_addr);1097 continue;1098 } else {1099 u8 s2[SAS_ADDR_SIZE];1100 1101 if (sas_find_sub_addr(child, s2) &&1102 (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {1103 1104 pr_notice("ex %016llx->%016llx-?->%016llx diverges from subtractive boundary %016llx\n",1105 SAS_ADDR(dev->sas_addr),1106 SAS_ADDR(child->sas_addr),1107 SAS_ADDR(s2),1108 SAS_ADDR(sub_addr));1109 1110 sas_ex_disable_port(child, s2);1111 }1112 }1113 }1114 return 0;1115}1116/**1117 * sas_ex_discover_devices - discover devices attached to this expander1118 * @dev: pointer to the expander domain device1119 * @single: if you want to do a single phy, else set to -1;1120 *1121 * Configure this expander for use with its devices and register the1122 * devices of this expander.1123 */1124static int sas_ex_discover_devices(struct domain_device *dev, int single)1125{1126 struct expander_device *ex = &dev->ex_dev;1127 int i = 0, end = ex->num_phys;1128 int res = 0;1129 1130 if (0 <= single && single < end) {1131 i = single;1132 end = i+1;1133 }1134 1135 for ( ; i < end; i++) {1136 struct ex_phy *ex_phy = &ex->ex_phy[i];1137 1138 if (ex_phy->phy_state == PHY_VACANT ||1139 ex_phy->phy_state == PHY_NOT_PRESENT ||1140 ex_phy->phy_state == PHY_DEVICE_DISCOVERED)1141 continue;1142 1143 switch (ex_phy->linkrate) {1144 case SAS_PHY_DISABLED:1145 case SAS_PHY_RESET_PROBLEM:1146 case SAS_SATA_PORT_SELECTOR:1147 continue;1148 default:1149 res = sas_ex_discover_dev(dev, i);1150 if (res)1151 break;1152 continue;1153 }1154 }1155 1156 if (!res)1157 sas_check_level_subtractive_boundary(dev);1158 1159 return res;1160}1161 1162static int sas_check_ex_subtractive_boundary(struct domain_device *dev)1163{1164 struct expander_device *ex = &dev->ex_dev;1165 int i;1166 u8 *sub_sas_addr = NULL;1167 1168 if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)1169 return 0;1170 1171 for (i = 0; i < ex->num_phys; i++) {1172 struct ex_phy *phy = &ex->ex_phy[i];1173 1174 if (phy->phy_state == PHY_VACANT ||1175 phy->phy_state == PHY_NOT_PRESENT)1176 continue;1177 1178 if (dev_is_expander(phy->attached_dev_type) &&1179 phy->routing_attr == SUBTRACTIVE_ROUTING) {1180 1181 if (!sub_sas_addr)1182 sub_sas_addr = &phy->attached_sas_addr[0];1183 else if (SAS_ADDR(sub_sas_addr) !=1184 SAS_ADDR(phy->attached_sas_addr)) {1185 1186 pr_notice("ex %016llx phy%02d diverges(%016llx) on subtractive boundary(%016llx). Disabled\n",1187 SAS_ADDR(dev->sas_addr), i,1188 SAS_ADDR(phy->attached_sas_addr),1189 SAS_ADDR(sub_sas_addr));1190 sas_ex_disable_phy(dev, i);1191 }1192 }1193 }1194 return 0;1195}1196 1197static void sas_print_parent_topology_bug(struct domain_device *child,1198 struct ex_phy *parent_phy,1199 struct ex_phy *child_phy)1200{1201 static const char *ex_type[] = {1202 [SAS_EDGE_EXPANDER_DEVICE] = "edge",1203 [SAS_FANOUT_EXPANDER_DEVICE] = "fanout",1204 };1205 struct domain_device *parent = child->parent;1206 1207 pr_notice("%s ex %016llx phy%02d <--> %s ex %016llx phy%02d has %c:%c routing link!\n",1208 ex_type[parent->dev_type],1209 SAS_ADDR(parent->sas_addr),1210 parent_phy->phy_id,1211 1212 ex_type[child->dev_type],1213 SAS_ADDR(child->sas_addr),1214 child_phy->phy_id,1215 1216 sas_route_char(parent, parent_phy),1217 sas_route_char(child, child_phy));1218}1219 1220static bool sas_eeds_valid(struct domain_device *parent,1221 struct domain_device *child)1222{1223 struct sas_discovery *disc = &parent->port->disc;1224 1225 return (SAS_ADDR(disc->eeds_a) == SAS_ADDR(parent->sas_addr) ||1226 SAS_ADDR(disc->eeds_a) == SAS_ADDR(child->sas_addr)) &&1227 (SAS_ADDR(disc->eeds_b) == SAS_ADDR(parent->sas_addr) ||1228 SAS_ADDR(disc->eeds_b) == SAS_ADDR(child->sas_addr));1229}1230 1231static int sas_check_eeds(struct domain_device *child,1232 struct ex_phy *parent_phy,1233 struct ex_phy *child_phy)1234{1235 int res = 0;1236 struct domain_device *parent = child->parent;1237 struct sas_discovery *disc = &parent->port->disc;1238 1239 if (SAS_ADDR(disc->fanout_sas_addr) != 0) {1240 res = -ENODEV;1241 pr_warn("edge ex %016llx phy S:%02d <--> edge ex %016llx phy S:%02d, while there is a fanout ex %016llx\n",1242 SAS_ADDR(parent->sas_addr),1243 parent_phy->phy_id,1244 SAS_ADDR(child->sas_addr),1245 child_phy->phy_id,1246 SAS_ADDR(disc->fanout_sas_addr));1247 } else if (SAS_ADDR(disc->eeds_a) == 0) {1248 memcpy(disc->eeds_a, parent->sas_addr, SAS_ADDR_SIZE);1249 memcpy(disc->eeds_b, child->sas_addr, SAS_ADDR_SIZE);1250 } else if (!sas_eeds_valid(parent, child)) {1251 res = -ENODEV;1252 pr_warn("edge ex %016llx phy%02d <--> edge ex %016llx phy%02d link forms a third EEDS!\n",1253 SAS_ADDR(parent->sas_addr),1254 parent_phy->phy_id,1255 SAS_ADDR(child->sas_addr),1256 child_phy->phy_id);1257 }1258 1259 return res;1260}1261 1262static int sas_check_edge_expander_topo(struct domain_device *child,1263 struct ex_phy *parent_phy)1264{1265 struct expander_device *child_ex = &child->ex_dev;1266 struct expander_device *parent_ex = &child->parent->ex_dev;1267 struct ex_phy *child_phy;1268 1269 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];1270 1271 if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {1272 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||1273 child_phy->routing_attr != TABLE_ROUTING)1274 goto error;1275 } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {1276 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING)1277 return sas_check_eeds(child, parent_phy, child_phy);1278 else if (child_phy->routing_attr != TABLE_ROUTING)1279 goto error;1280 } else if (parent_phy->routing_attr == TABLE_ROUTING) {1281 if (child_phy->routing_attr != SUBTRACTIVE_ROUTING &&1282 (child_phy->routing_attr != TABLE_ROUTING ||1283 !child_ex->t2t_supp || !parent_ex->t2t_supp))1284 goto error;1285 }1286 1287 return 0;1288error:1289 sas_print_parent_topology_bug(child, parent_phy, child_phy);1290 return -ENODEV;1291}1292 1293static int sas_check_fanout_expander_topo(struct domain_device *child,1294 struct ex_phy *parent_phy)1295{1296 struct expander_device *child_ex = &child->ex_dev;1297 struct ex_phy *child_phy;1298 1299 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];1300 1301 if (parent_phy->routing_attr == TABLE_ROUTING &&1302 child_phy->routing_attr == SUBTRACTIVE_ROUTING)1303 return 0;1304 1305 sas_print_parent_topology_bug(child, parent_phy, child_phy);1306 1307 return -ENODEV;1308}1309 1310static int sas_check_parent_topology(struct domain_device *child)1311{1312 struct expander_device *parent_ex;1313 int i;1314 int res = 0;1315 1316 if (!child->parent)1317 return 0;1318 1319 if (!dev_is_expander(child->parent->dev_type))1320 return 0;1321 1322 parent_ex = &child->parent->ex_dev;1323 1324 for (i = 0; i < parent_ex->num_phys; i++) {1325 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];1326 1327 if (parent_phy->phy_state == PHY_VACANT ||1328 parent_phy->phy_state == PHY_NOT_PRESENT)1329 continue;1330 1331 if (!sas_phy_match_dev_addr(child, parent_phy))1332 continue;1333 1334 switch (child->parent->dev_type) {1335 case SAS_EDGE_EXPANDER_DEVICE:1336 if (sas_check_edge_expander_topo(child, parent_phy))1337 res = -ENODEV;1338 break;1339 case SAS_FANOUT_EXPANDER_DEVICE:1340 if (sas_check_fanout_expander_topo(child, parent_phy))1341 res = -ENODEV;1342 break;1343 default:1344 break;1345 }1346 }1347 1348 return res;1349}1350 1351#define RRI_REQ_SIZE 161352#define RRI_RESP_SIZE 441353 1354static int sas_configure_present(struct domain_device *dev, int phy_id,1355 u8 *sas_addr, int *index, int *present)1356{1357 int i, res = 0;1358 struct expander_device *ex = &dev->ex_dev;1359 struct ex_phy *phy = &ex->ex_phy[phy_id];1360 u8 *rri_req;1361 u8 *rri_resp;1362 1363 *present = 0;1364 *index = 0;1365 1366 rri_req = alloc_smp_req(RRI_REQ_SIZE);1367 if (!rri_req)1368 return -ENOMEM;1369 1370 rri_resp = alloc_smp_resp(RRI_RESP_SIZE);1371 if (!rri_resp) {1372 kfree(rri_req);1373 return -ENOMEM;1374 }1375 1376 rri_req[1] = SMP_REPORT_ROUTE_INFO;1377 rri_req[9] = phy_id;1378 1379 for (i = 0; i < ex->max_route_indexes ; i++) {1380 *(__be16 *)(rri_req+6) = cpu_to_be16(i);1381 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,1382 RRI_RESP_SIZE);1383 if (res)1384 goto out;1385 res = rri_resp[2];1386 if (res == SMP_RESP_NO_INDEX) {1387 pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",1388 SAS_ADDR(dev->sas_addr), phy_id, i);1389 goto out;1390 } else if (res != SMP_RESP_FUNC_ACC) {1391 pr_notice("%s: dev %016llx phy%02d index 0x%x result 0x%x\n",1392 __func__, SAS_ADDR(dev->sas_addr), phy_id,1393 i, res);1394 goto out;1395 }1396 if (SAS_ADDR(sas_addr) != 0) {1397 if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {1398 *index = i;1399 if ((rri_resp[12] & 0x80) == 0x80)1400 *present = 0;1401 else1402 *present = 1;1403 goto out;1404 } else if (SAS_ADDR(rri_resp+16) == 0) {1405 *index = i;1406 *present = 0;1407 goto out;1408 }1409 } else if (SAS_ADDR(rri_resp+16) == 0 &&1410 phy->last_da_index < i) {1411 phy->last_da_index = i;1412 *index = i;1413 *present = 0;1414 goto out;1415 }1416 }1417 res = -1;1418out:1419 kfree(rri_req);1420 kfree(rri_resp);1421 return res;1422}1423 1424#define CRI_REQ_SIZE 441425#define CRI_RESP_SIZE 81426 1427static int sas_configure_set(struct domain_device *dev, int phy_id,1428 u8 *sas_addr, int index, int include)1429{1430 int res;1431 u8 *cri_req;1432 u8 *cri_resp;1433 1434 cri_req = alloc_smp_req(CRI_REQ_SIZE);1435 if (!cri_req)1436 return -ENOMEM;1437 1438 cri_resp = alloc_smp_resp(CRI_RESP_SIZE);1439 if (!cri_resp) {1440 kfree(cri_req);1441 return -ENOMEM;1442 }1443 1444 cri_req[1] = SMP_CONF_ROUTE_INFO;1445 *(__be16 *)(cri_req+6) = cpu_to_be16(index);1446 cri_req[9] = phy_id;1447 if (SAS_ADDR(sas_addr) == 0 || !include)1448 cri_req[12] |= 0x80;1449 memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);1450 1451 res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,1452 CRI_RESP_SIZE);1453 if (res)1454 goto out;1455 res = cri_resp[2];1456 if (res == SMP_RESP_NO_INDEX) {1457 pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",1458 SAS_ADDR(dev->sas_addr), phy_id, index);1459 }1460out:1461 kfree(cri_req);1462 kfree(cri_resp);1463 return res;1464}1465 1466static int sas_configure_phy(struct domain_device *dev, int phy_id,1467 u8 *sas_addr, int include)1468{1469 int index;1470 int present;1471 int res;1472 1473 res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);1474 if (res)1475 return res;1476 if (include ^ present)1477 return sas_configure_set(dev, phy_id, sas_addr, index,1478 include);1479 1480 return res;1481}1482 1483/**1484 * sas_configure_parent - configure routing table of parent1485 * @parent: parent expander1486 * @child: child expander1487 * @sas_addr: SAS port identifier of device directly attached to child1488 * @include: whether or not to include @child in the expander routing table1489 */1490static int sas_configure_parent(struct domain_device *parent,1491 struct domain_device *child,1492 u8 *sas_addr, int include)1493{1494 struct expander_device *ex_parent = &parent->ex_dev;1495 int res = 0;1496 int i;1497 1498 if (parent->parent) {1499 res = sas_configure_parent(parent->parent, parent, sas_addr,1500 include);1501 if (res)1502 return res;1503 }1504 1505 if (ex_parent->conf_route_table == 0) {1506 pr_debug("ex %016llx has self-configuring routing table\n",1507 SAS_ADDR(parent->sas_addr));1508 return 0;1509 }1510 1511 for (i = 0; i < ex_parent->num_phys; i++) {1512 struct ex_phy *phy = &ex_parent->ex_phy[i];1513 1514 if ((phy->routing_attr == TABLE_ROUTING) &&1515 sas_phy_match_dev_addr(child, phy)) {1516 res = sas_configure_phy(parent, i, sas_addr, include);1517 if (res)1518 return res;1519 }1520 }1521 1522 return res;1523}1524 1525/**1526 * sas_configure_routing - configure routing1527 * @dev: expander device1528 * @sas_addr: port identifier of device directly attached to the expander device1529 */1530static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)1531{1532 if (dev->parent)1533 return sas_configure_parent(dev->parent, dev, sas_addr, 1);1534 return 0;1535}1536 1537static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr)1538{1539 if (dev->parent)1540 return sas_configure_parent(dev->parent, dev, sas_addr, 0);1541 return 0;1542}1543 1544/**1545 * sas_discover_expander - expander discovery1546 * @dev: pointer to expander domain device1547 *1548 * See comment in sas_discover_sata().1549 */1550static int sas_discover_expander(struct domain_device *dev)1551{1552 int res;1553 1554 res = sas_notify_lldd_dev_found(dev);1555 if (res)1556 return res;1557 1558 res = sas_ex_general(dev);1559 if (res)1560 goto out_err;1561 res = sas_ex_manuf_info(dev);1562 if (res)1563 goto out_err;1564 1565 res = sas_expander_discover(dev);1566 if (res) {1567 pr_warn("expander %016llx discovery failed(0x%x)\n",1568 SAS_ADDR(dev->sas_addr), res);1569 goto out_err;1570 }1571 1572 sas_check_ex_subtractive_boundary(dev);1573 res = sas_check_parent_topology(dev);1574 if (res)1575 goto out_err;1576 return 0;1577out_err:1578 sas_notify_lldd_dev_gone(dev);1579 return res;1580}1581 1582static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)1583{1584 int res = 0;1585 struct domain_device *dev;1586 1587 list_for_each_entry(dev, &port->dev_list, dev_list_node) {1588 if (dev_is_expander(dev->dev_type)) {1589 struct sas_expander_device *ex =1590 rphy_to_expander_device(dev->rphy);1591 1592 if (level == ex->level)1593 res = sas_ex_discover_devices(dev, -1);1594 else if (level > 0)1595 res = sas_ex_discover_devices(port->port_dev, -1);1596 1597 }1598 }1599 1600 return res;1601}1602 1603static int sas_ex_bfs_disc(struct asd_sas_port *port)1604{1605 int res;1606 int level;1607 1608 do {1609 level = port->disc.max_level;1610 res = sas_ex_level_discovery(port, level);1611 mb();1612 } while (level < port->disc.max_level);1613 1614 return res;1615}1616 1617int sas_discover_root_expander(struct domain_device *dev)1618{1619 int res;1620 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);1621 1622 res = sas_rphy_add(dev->rphy);1623 if (res)1624 goto out_err;1625 1626 ex->level = dev->port->disc.max_level; /* 0 */1627 res = sas_discover_expander(dev);1628 if (res)1629 goto out_err2;1630 1631 sas_ex_bfs_disc(dev->port);1632 1633 return res;1634 1635out_err2:1636 sas_rphy_remove(dev->rphy);1637out_err:1638 return res;1639}1640 1641/* ---------- Domain revalidation ---------- */1642 1643static void sas_get_sas_addr_and_dev_type(struct smp_disc_resp *disc_resp,1644 u8 *sas_addr,1645 enum sas_device_type *type)1646{1647 memcpy(sas_addr, disc_resp->disc.attached_sas_addr, SAS_ADDR_SIZE);1648 *type = to_dev_type(&disc_resp->disc);1649 if (*type == SAS_PHY_UNUSED)1650 memset(sas_addr, 0, SAS_ADDR_SIZE);1651}1652 1653static int sas_get_phy_discover(struct domain_device *dev,1654 int phy_id, struct smp_disc_resp *disc_resp)1655{1656 int res;1657 u8 *disc_req;1658 1659 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);1660 if (!disc_req)1661 return -ENOMEM;1662 1663 disc_req[1] = SMP_DISCOVER;1664 disc_req[9] = phy_id;1665 1666 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,1667 disc_resp, DISCOVER_RESP_SIZE);1668 if (res)1669 goto out;1670 if (disc_resp->result != SMP_RESP_FUNC_ACC)1671 res = disc_resp->result;1672out:1673 kfree(disc_req);1674 return res;1675}1676 1677static int sas_get_phy_change_count(struct domain_device *dev,1678 int phy_id, int *pcc)1679{1680 int res;1681 struct smp_disc_resp *disc_resp;1682 1683 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);1684 if (!disc_resp)1685 return -ENOMEM;1686 1687 res = sas_get_phy_discover(dev, phy_id, disc_resp);1688 if (!res)1689 *pcc = disc_resp->disc.change_count;1690 1691 kfree(disc_resp);1692 return res;1693}1694 1695int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,1696 u8 *sas_addr, enum sas_device_type *type)1697{1698 int res;1699 struct smp_disc_resp *disc_resp;1700 1701 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);1702 if (!disc_resp)1703 return -ENOMEM;1704 1705 res = sas_get_phy_discover(dev, phy_id, disc_resp);1706 if (res == 0)1707 sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, type);1708 kfree(disc_resp);1709 return res;1710}1711 1712static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,1713 int from_phy, bool update)1714{1715 struct expander_device *ex = &dev->ex_dev;1716 int res = 0;1717 int i;1718 1719 for (i = from_phy; i < ex->num_phys; i++) {1720 int phy_change_count = 0;1721 1722 res = sas_get_phy_change_count(dev, i, &phy_change_count);1723 switch (res) {1724 case SMP_RESP_PHY_VACANT:1725 case SMP_RESP_NO_PHY:1726 continue;1727 case SMP_RESP_FUNC_ACC:1728 break;1729 default:1730 return res;1731 }1732 1733 if (phy_change_count != ex->ex_phy[i].phy_change_count) {1734 if (update)1735 ex->ex_phy[i].phy_change_count =1736 phy_change_count;1737 *phy_id = i;1738 return 0;1739 }1740 }1741 return 0;1742}1743 1744static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)1745{1746 int res;1747 u8 *rg_req;1748 struct smp_rg_resp *rg_resp;1749 1750 rg_req = alloc_smp_req(RG_REQ_SIZE);1751 if (!rg_req)1752 return -ENOMEM;1753 1754 rg_resp = alloc_smp_resp(RG_RESP_SIZE);1755 if (!rg_resp) {1756 kfree(rg_req);1757 return -ENOMEM;1758 }1759 1760 rg_req[1] = SMP_REPORT_GENERAL;1761 1762 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,1763 RG_RESP_SIZE);1764 if (res)1765 goto out;1766 if (rg_resp->result != SMP_RESP_FUNC_ACC) {1767 res = rg_resp->result;1768 goto out;1769 }1770 1771 *ecc = be16_to_cpu(rg_resp->rg.change_count);1772out:1773 kfree(rg_resp);1774 kfree(rg_req);1775 return res;1776}1777/**1778 * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE).1779 * @dev:domain device to be detect.1780 * @src_dev: the device which originated BROADCAST(CHANGE).1781 *1782 * Add self-configuration expander support. Suppose two expander cascading,1783 * when the first level expander is self-configuring, hotplug the disks in1784 * second level expander, BROADCAST(CHANGE) will not only be originated1785 * in the second level expander, but also be originated in the first level1786 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,1787 * expander changed count in two level expanders will all increment at least1788 * once, but the phy which chang count has changed is the source device which1789 * we concerned.1790 */1791 1792static int sas_find_bcast_dev(struct domain_device *dev,1793 struct domain_device **src_dev)1794{1795 struct expander_device *ex = &dev->ex_dev;1796 int ex_change_count = -1;1797 int phy_id = -1;1798 int res;1799 struct domain_device *ch;1800 1801 res = sas_get_ex_change_count(dev, &ex_change_count);1802 if (res)1803 goto out;1804 if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {1805 /* Just detect if this expander phys phy change count changed,1806 * in order to determine if this expander originate BROADCAST,1807 * and do not update phy change count field in our structure.1808 */1809 res = sas_find_bcast_phy(dev, &phy_id, 0, false);1810 if (phy_id != -1) {1811 *src_dev = dev;1812 ex->ex_change_count = ex_change_count;1813 pr_info("ex %016llx phy%02d change count has changed\n",1814 SAS_ADDR(dev->sas_addr), phy_id);1815 return res;1816 } else1817 pr_info("ex %016llx phys DID NOT change\n",1818 SAS_ADDR(dev->sas_addr));1819 }1820 list_for_each_entry(ch, &ex->children, siblings) {1821 if (dev_is_expander(ch->dev_type)) {1822 res = sas_find_bcast_dev(ch, src_dev);1823 if (*src_dev)1824 return res;1825 }1826 }1827out:1828 return res;1829}1830 1831static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)1832{1833 struct expander_device *ex = &dev->ex_dev;1834 struct domain_device *child, *n;1835 1836 list_for_each_entry_safe(child, n, &ex->children, siblings) {1837 set_bit(SAS_DEV_GONE, &child->state);1838 if (dev_is_expander(child->dev_type))1839 sas_unregister_ex_tree(port, child);1840 else1841 sas_unregister_dev(port, child);1842 }1843 sas_unregister_dev(port, dev);1844}1845 1846static void sas_unregister_devs_sas_addr(struct domain_device *parent,1847 int phy_id, bool last)1848{1849 struct expander_device *ex_dev = &parent->ex_dev;1850 struct ex_phy *phy = &ex_dev->ex_phy[phy_id];1851 struct domain_device *child, *n, *found = NULL;1852 if (last) {1853 list_for_each_entry_safe(child, n,1854 &ex_dev->children, siblings) {1855 if (sas_phy_match_dev_addr(child, phy)) {1856 set_bit(SAS_DEV_GONE, &child->state);1857 if (dev_is_expander(child->dev_type))1858 sas_unregister_ex_tree(parent->port, child);1859 else1860 sas_unregister_dev(parent->port, child);1861 found = child;1862 break;1863 }1864 }1865 sas_disable_routing(parent, phy->attached_sas_addr);1866 }1867 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);1868 if (phy->port) {1869 sas_port_delete_phy(phy->port, phy->phy);1870 sas_device_set_phy(found, phy->port);1871 if (phy->port->num_phys == 0) {1872 list_add_tail(&phy->port->del_list,1873 &parent->port->sas_port_del_list);1874 if (ex_dev->parent_port == phy->port)1875 ex_dev->parent_port = NULL;1876 }1877 phy->port = NULL;1878 }1879}1880 1881static int sas_discover_bfs_by_root_level(struct domain_device *root,1882 const int level)1883{1884 struct expander_device *ex_root = &root->ex_dev;1885 struct domain_device *child;1886 int res = 0;1887 1888 list_for_each_entry(child, &ex_root->children, siblings) {1889 if (dev_is_expander(child->dev_type)) {1890 struct sas_expander_device *ex =1891 rphy_to_expander_device(child->rphy);1892 1893 if (level > ex->level)1894 res = sas_discover_bfs_by_root_level(child,1895 level);1896 else if (level == ex->level)1897 res = sas_ex_discover_devices(child, -1);1898 }1899 }1900 return res;1901}1902 1903static int sas_discover_bfs_by_root(struct domain_device *dev)1904{1905 int res;1906 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);1907 int level = ex->level+1;1908 1909 res = sas_ex_discover_devices(dev, -1);1910 if (res)1911 goto out;1912 do {1913 res = sas_discover_bfs_by_root_level(dev, level);1914 mb();1915 level += 1;1916 } while (level <= dev->port->disc.max_level);1917out:1918 return res;1919}1920 1921static int sas_discover_new(struct domain_device *dev, int phy_id)1922{1923 struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];1924 struct domain_device *child;1925 int res;1926 1927 pr_debug("ex %016llx phy%02d new device attached\n",1928 SAS_ADDR(dev->sas_addr), phy_id);1929 res = sas_ex_phy_discover(dev, phy_id);1930 if (res)1931 return res;1932 1933 if (sas_ex_join_wide_port(dev, phy_id))1934 return 0;1935 1936 res = sas_ex_discover_devices(dev, phy_id);1937 if (res)1938 return res;1939 list_for_each_entry(child, &dev->ex_dev.children, siblings) {1940 if (sas_phy_match_dev_addr(child, ex_phy)) {1941 if (dev_is_expander(child->dev_type))1942 res = sas_discover_bfs_by_root(child);1943 break;1944 }1945 }1946 return res;1947}1948 1949static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)1950{1951 if (old == new)1952 return true;1953 1954 /* treat device directed resets as flutter, if we went1955 * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery1956 */1957 if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||1958 (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))1959 return true;1960 1961 return false;1962}1963 1964static int sas_rediscover_dev(struct domain_device *dev, int phy_id,1965 bool last, int sibling)1966{1967 struct expander_device *ex = &dev->ex_dev;1968 struct ex_phy *phy = &ex->ex_phy[phy_id];1969 enum sas_device_type type = SAS_PHY_UNUSED;1970 struct smp_disc_resp *disc_resp;1971 u8 sas_addr[SAS_ADDR_SIZE];1972 char msg[80] = "";1973 int res;1974 1975 if (!last)1976 sprintf(msg, ", part of a wide port with phy%02d", sibling);1977 1978 pr_debug("ex %016llx rediscovering phy%02d%s\n",1979 SAS_ADDR(dev->sas_addr), phy_id, msg);1980 1981 memset(sas_addr, 0, SAS_ADDR_SIZE);1982 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);1983 if (!disc_resp)1984 return -ENOMEM;1985 1986 res = sas_get_phy_discover(dev, phy_id, disc_resp);1987 switch (res) {1988 case SMP_RESP_NO_PHY:1989 phy->phy_state = PHY_NOT_PRESENT;1990 sas_unregister_devs_sas_addr(dev, phy_id, last);1991 goto out_free_resp;1992 case SMP_RESP_PHY_VACANT:1993 phy->phy_state = PHY_VACANT;1994 sas_unregister_devs_sas_addr(dev, phy_id, last);1995 goto out_free_resp;1996 case SMP_RESP_FUNC_ACC:1997 break;1998 case -ECOMM:1999 break;2000 default:2001 goto out_free_resp;2002 }2003 2004 if (res == 0)2005 sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, &type);2006 2007 if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {2008 phy->phy_state = PHY_EMPTY;2009 sas_unregister_devs_sas_addr(dev, phy_id, last);2010 /*2011 * Even though the PHY is empty, for convenience we update2012 * the PHY info, like negotiated linkrate.2013 */2014 if (res == 0)2015 sas_set_ex_phy(dev, phy_id, disc_resp);2016 goto out_free_resp;2017 } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&2018 dev_type_flutter(type, phy->attached_dev_type)) {2019 struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);2020 char *action = "";2021 2022 sas_ex_phy_discover(dev, phy_id);2023 2024 if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)2025 action = ", needs recovery";2026 pr_debug("ex %016llx phy%02d broadcast flutter%s\n",2027 SAS_ADDR(dev->sas_addr), phy_id, action);2028 goto out_free_resp;2029 }2030 2031 /* we always have to delete the old device when we went here */2032 pr_info("ex %016llx phy%02d replace %016llx\n",2033 SAS_ADDR(dev->sas_addr), phy_id,2034 SAS_ADDR(phy->attached_sas_addr));2035 sas_unregister_devs_sas_addr(dev, phy_id, last);2036 2037 res = sas_discover_new(dev, phy_id);2038out_free_resp:2039 kfree(disc_resp);2040 return res;2041}2042 2043/**2044 * sas_rediscover - revalidate the domain.2045 * @dev:domain device to be detect.2046 * @phy_id: the phy id will be detected.2047 *2048 * NOTE: this process _must_ quit (return) as soon as any connection2049 * errors are encountered. Connection recovery is done elsewhere.2050 * Discover process only interrogates devices in order to discover the2051 * domain.For plugging out, we un-register the device only when it is2052 * the last phy in the port, for other phys in this port, we just delete it2053 * from the port.For inserting, we do discovery when it is the2054 * first phy,for other phys in this port, we add it to the port to2055 * forming the wide-port.2056 */2057static int sas_rediscover(struct domain_device *dev, const int phy_id)2058{2059 struct expander_device *ex = &dev->ex_dev;2060 struct ex_phy *changed_phy = &ex->ex_phy[phy_id];2061 int res = 0;2062 int i;2063 bool last = true; /* is this the last phy of the port */2064 2065 pr_debug("ex %016llx phy%02d originated BROADCAST(CHANGE)\n",2066 SAS_ADDR(dev->sas_addr), phy_id);2067 2068 if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {2069 for (i = 0; i < ex->num_phys; i++) {2070 struct ex_phy *phy = &ex->ex_phy[i];2071 2072 if (i == phy_id)2073 continue;2074 if (sas_phy_addr_match(phy, changed_phy)) {2075 last = false;2076 break;2077 }2078 }2079 res = sas_rediscover_dev(dev, phy_id, last, i);2080 } else2081 res = sas_discover_new(dev, phy_id);2082 return res;2083}2084 2085/**2086 * sas_ex_revalidate_domain - revalidate the domain2087 * @port_dev: port domain device.2088 *2089 * NOTE: this process _must_ quit (return) as soon as any connection2090 * errors are encountered. Connection recovery is done elsewhere.2091 * Discover process only interrogates devices in order to discover the2092 * domain.2093 */2094int sas_ex_revalidate_domain(struct domain_device *port_dev)2095{2096 int res;2097 struct domain_device *dev = NULL;2098 2099 res = sas_find_bcast_dev(port_dev, &dev);2100 if (res == 0 && dev) {2101 struct expander_device *ex = &dev->ex_dev;2102 int i = 0, phy_id;2103 2104 do {2105 phy_id = -1;2106 res = sas_find_bcast_phy(dev, &phy_id, i, true);2107 if (phy_id == -1)2108 break;2109 res = sas_rediscover(dev, phy_id);2110 i = phy_id + 1;2111 } while (i < ex->num_phys);2112 }2113 return res;2114}2115 2116int sas_find_attached_phy_id(struct expander_device *ex_dev,2117 struct domain_device *dev)2118{2119 struct ex_phy *phy;2120 int phy_id;2121 2122 for (phy_id = 0; phy_id < ex_dev->num_phys; phy_id++) {2123 phy = &ex_dev->ex_phy[phy_id];2124 if (sas_phy_match_dev_addr(dev, phy))2125 return phy_id;2126 }2127 2128 return -ENODEV;2129}2130EXPORT_SYMBOL_GPL(sas_find_attached_phy_id);2131 2132void sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,2133 struct sas_rphy *rphy)2134{2135 struct domain_device *dev;2136 unsigned int rcvlen = 0;2137 int ret = -EINVAL;2138 2139 /* no rphy means no smp target support (ie aic94xx host) */2140 if (!rphy)2141 return sas_smp_host_handler(job, shost);2142 2143 switch (rphy->identify.device_type) {2144 case SAS_EDGE_EXPANDER_DEVICE:2145 case SAS_FANOUT_EXPANDER_DEVICE:2146 break;2147 default:2148 pr_err("%s: can we send a smp request to a device?\n",2149 __func__);2150 goto out;2151 }2152 2153 dev = sas_find_dev_by_rphy(rphy);2154 if (!dev) {2155 pr_err("%s: fail to find a domain_device?\n", __func__);2156 goto out;2157 }2158 2159 /* do we need to support multiple segments? */2160 if (job->request_payload.sg_cnt > 1 ||2161 job->reply_payload.sg_cnt > 1) {2162 pr_info("%s: multiple segments req %u, rsp %u\n",2163 __func__, job->request_payload.payload_len,2164 job->reply_payload.payload_len);2165 goto out;2166 }2167 2168 ret = smp_execute_task_sg(dev, job->request_payload.sg_list,2169 job->reply_payload.sg_list);2170 if (ret >= 0) {2171 /* bsg_job_done() requires the length received */2172 rcvlen = job->reply_payload.payload_len - ret;2173 ret = 0;2174 }2175 2176out:2177 bsg_job_done(job, ret, rcvlen);2178}2179