sas_scsi_host.c revision 735f7d2fedf57380214221be7bed7f62d729e262
1/* 2 * Serial Attached SCSI (SAS) class SCSI Host glue. 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 22 * USA 23 * 24 */ 25 26#include <linux/kthread.h> 27#include <linux/firmware.h> 28#include <linux/export.h> 29#include <linux/ctype.h> 30 31#include "sas_internal.h" 32 33#include <scsi/scsi_host.h> 34#include <scsi/scsi_device.h> 35#include <scsi/scsi_tcq.h> 36#include <scsi/scsi.h> 37#include <scsi/scsi_eh.h> 38#include <scsi/scsi_transport.h> 39#include <scsi/scsi_transport_sas.h> 40#include <scsi/sas_ata.h> 41#include "../scsi_sas_internal.h" 42#include "../scsi_transport_api.h" 43#include "../scsi_priv.h" 44 45#include <linux/err.h> 46#include <linux/blkdev.h> 47#include <linux/freezer.h> 48#include <linux/gfp.h> 49#include <linux/scatterlist.h> 50#include <linux/libata.h> 51 52/* ---------- SCSI Host glue ---------- */ 53 54static void sas_scsi_task_done(struct sas_task *task) 55{ 56 struct task_status_struct *ts = &task->task_status; 57 struct scsi_cmnd *sc = task->uldd_task; 58 int hs = 0, stat = 0; 59 60 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) { 61 /* Aborted tasks will be completed by the error handler */ 62 SAS_DPRINTK("task done but aborted\n"); 63 return; 64 } 65 66 if (unlikely(!sc)) { 67 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n"); 68 list_del_init(&task->list); 69 sas_free_task(task); 70 return; 71 } 72 73 if (ts->resp == SAS_TASK_UNDELIVERED) { 74 /* transport error */ 75 hs = DID_NO_CONNECT; 76 } else { /* ts->resp == SAS_TASK_COMPLETE */ 77 /* task delivered, what happened afterwards? */ 78 switch (ts->stat) { 79 case SAS_DEV_NO_RESPONSE: 80 case SAS_INTERRUPTED: 81 case SAS_PHY_DOWN: 82 case SAS_NAK_R_ERR: 83 case SAS_OPEN_TO: 84 hs = DID_NO_CONNECT; 85 break; 86 case SAS_DATA_UNDERRUN: 87 scsi_set_resid(sc, ts->residual); 88 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow) 89 hs = DID_ERROR; 90 break; 91 case SAS_DATA_OVERRUN: 92 hs = DID_ERROR; 93 break; 94 case SAS_QUEUE_FULL: 95 hs = DID_SOFT_ERROR; /* retry */ 96 break; 97 case SAS_DEVICE_UNKNOWN: 98 hs = DID_BAD_TARGET; 99 break; 100 case SAS_SG_ERR: 101 hs = DID_PARITY; 102 break; 103 case SAS_OPEN_REJECT: 104 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY) 105 hs = DID_SOFT_ERROR; /* retry */ 106 else 107 hs = DID_ERROR; 108 break; 109 case SAS_PROTO_RESPONSE: 110 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP " 111 "task; please report this\n", 112 task->dev->port->ha->sas_ha_name); 113 break; 114 case SAS_ABORTED_TASK: 115 hs = DID_ABORT; 116 break; 117 case SAM_STAT_CHECK_CONDITION: 118 memcpy(sc->sense_buffer, ts->buf, 119 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size)); 120 stat = SAM_STAT_CHECK_CONDITION; 121 break; 122 default: 123 stat = ts->stat; 124 break; 125 } 126 } 127 ASSIGN_SAS_TASK(sc, NULL); 128 sc->result = (hs << 16) | stat; 129 list_del_init(&task->list); 130 sas_free_task(task); 131 sc->scsi_done(sc); 132} 133 134static struct sas_task *sas_create_task(struct scsi_cmnd *cmd, 135 struct domain_device *dev, 136 gfp_t gfp_flags) 137{ 138 struct sas_task *task = sas_alloc_task(gfp_flags); 139 struct scsi_lun lun; 140 141 if (!task) 142 return NULL; 143 144 task->uldd_task = cmd; 145 ASSIGN_SAS_TASK(cmd, task); 146 147 task->dev = dev; 148 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */ 149 150 task->ssp_task.retry_count = 1; 151 int_to_scsilun(cmd->device->lun, &lun); 152 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8); 153 task->ssp_task.task_attr = TASK_ATTR_SIMPLE; 154 memcpy(task->ssp_task.cdb, cmd->cmnd, 16); 155 156 task->scatter = scsi_sglist(cmd); 157 task->num_scatter = scsi_sg_count(cmd); 158 task->total_xfer_len = scsi_bufflen(cmd); 159 task->data_dir = cmd->sc_data_direction; 160 161 task->task_done = sas_scsi_task_done; 162 163 return task; 164} 165 166int sas_queue_up(struct sas_task *task) 167{ 168 struct sas_ha_struct *sas_ha = task->dev->port->ha; 169 struct scsi_core *core = &sas_ha->core; 170 unsigned long flags; 171 LIST_HEAD(list); 172 173 spin_lock_irqsave(&core->task_queue_lock, flags); 174 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) { 175 spin_unlock_irqrestore(&core->task_queue_lock, flags); 176 return -SAS_QUEUE_FULL; 177 } 178 list_add_tail(&task->list, &core->task_queue); 179 core->task_queue_size += 1; 180 spin_unlock_irqrestore(&core->task_queue_lock, flags); 181 wake_up_process(core->queue_thread); 182 183 return 0; 184} 185 186int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) 187{ 188 struct sas_internal *i = to_sas_internal(host->transportt); 189 struct domain_device *dev = cmd_to_domain_dev(cmd); 190 struct sas_ha_struct *sas_ha = dev->port->ha; 191 struct sas_task *task; 192 int res = 0; 193 194 /* If the device fell off, no sense in issuing commands */ 195 if (dev->gone) { 196 cmd->result = DID_BAD_TARGET << 16; 197 goto out_done; 198 } 199 200 if (dev_is_sata(dev)) { 201 unsigned long flags; 202 203 spin_lock_irqsave(dev->sata_dev.ap->lock, flags); 204 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap); 205 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags); 206 return res; 207 } 208 209 task = sas_create_task(cmd, dev, GFP_ATOMIC); 210 if (!task) 211 return SCSI_MLQUEUE_HOST_BUSY; 212 213 /* Queue up, Direct Mode or Task Collector Mode. */ 214 if (sas_ha->lldd_max_execute_num < 2) 215 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); 216 else 217 res = sas_queue_up(task); 218 219 if (res) 220 goto out_free_task; 221 return 0; 222 223out_free_task: 224 SAS_DPRINTK("lldd_execute_task returned: %d\n", res); 225 ASSIGN_SAS_TASK(cmd, NULL); 226 sas_free_task(task); 227 if (res == -SAS_QUEUE_FULL) 228 cmd->result = DID_SOFT_ERROR << 16; /* retry */ 229 else 230 cmd->result = DID_ERROR << 16; 231out_done: 232 cmd->scsi_done(cmd); 233 return 0; 234} 235 236static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) 237{ 238 struct sas_task *task = TO_SAS_TASK(cmd); 239 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host); 240 241 /* remove the aborted task flag to allow the task to be 242 * completed now. At this point, we only get called following 243 * an actual abort of the task, so we should be guaranteed not 244 * to be racing with any completions from the LLD (hence we 245 * don't need the task state lock to clear the flag) */ 246 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 247 /* Now call task_done. However, task will be free'd after 248 * this */ 249 task->task_done(task); 250 /* now finish the command and move it on to the error 251 * handler done list, this also takes it off the 252 * error handler pending list */ 253 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q); 254} 255 256static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd) 257{ 258 struct scsi_cmnd *cmd, *n; 259 260 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 261 if (cmd->device->sdev_target == my_cmd->device->sdev_target && 262 cmd->device->lun == my_cmd->device->lun) 263 sas_eh_finish_cmd(cmd); 264 } 265} 266 267static void sas_scsi_clear_queue_I_T(struct list_head *error_q, 268 struct domain_device *dev) 269{ 270 struct scsi_cmnd *cmd, *n; 271 272 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 273 struct domain_device *x = cmd_to_domain_dev(cmd); 274 275 if (x == dev) 276 sas_eh_finish_cmd(cmd); 277 } 278} 279 280static void sas_scsi_clear_queue_port(struct list_head *error_q, 281 struct asd_sas_port *port) 282{ 283 struct scsi_cmnd *cmd, *n; 284 285 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 286 struct domain_device *dev = cmd_to_domain_dev(cmd); 287 struct asd_sas_port *x = dev->port; 288 289 if (x == port) 290 sas_eh_finish_cmd(cmd); 291 } 292} 293 294enum task_disposition { 295 TASK_IS_DONE, 296 TASK_IS_ABORTED, 297 TASK_IS_AT_LU, 298 TASK_IS_NOT_AT_LU, 299 TASK_ABORT_FAILED, 300}; 301 302static enum task_disposition sas_scsi_find_task(struct sas_task *task) 303{ 304 struct sas_ha_struct *ha = task->dev->port->ha; 305 unsigned long flags; 306 int i, res; 307 struct sas_internal *si = 308 to_sas_internal(task->dev->port->ha->core.shost->transportt); 309 310 if (ha->lldd_max_execute_num > 1) { 311 struct scsi_core *core = &ha->core; 312 struct sas_task *t, *n; 313 314 spin_lock_irqsave(&core->task_queue_lock, flags); 315 list_for_each_entry_safe(t, n, &core->task_queue, list) { 316 if (task == t) { 317 list_del_init(&t->list); 318 spin_unlock_irqrestore(&core->task_queue_lock, 319 flags); 320 SAS_DPRINTK("%s: task 0x%p aborted from " 321 "task_queue\n", 322 __func__, task); 323 return TASK_IS_ABORTED; 324 } 325 } 326 spin_unlock_irqrestore(&core->task_queue_lock, flags); 327 } 328 329 for (i = 0; i < 5; i++) { 330 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task); 331 res = si->dft->lldd_abort_task(task); 332 333 spin_lock_irqsave(&task->task_state_lock, flags); 334 if (task->task_state_flags & SAS_TASK_STATE_DONE) { 335 spin_unlock_irqrestore(&task->task_state_lock, flags); 336 SAS_DPRINTK("%s: task 0x%p is done\n", __func__, 337 task); 338 return TASK_IS_DONE; 339 } 340 spin_unlock_irqrestore(&task->task_state_lock, flags); 341 342 if (res == TMF_RESP_FUNC_COMPLETE) { 343 SAS_DPRINTK("%s: task 0x%p is aborted\n", 344 __func__, task); 345 return TASK_IS_ABORTED; 346 } else if (si->dft->lldd_query_task) { 347 SAS_DPRINTK("%s: querying task 0x%p\n", 348 __func__, task); 349 res = si->dft->lldd_query_task(task); 350 switch (res) { 351 case TMF_RESP_FUNC_SUCC: 352 SAS_DPRINTK("%s: task 0x%p at LU\n", 353 __func__, task); 354 return TASK_IS_AT_LU; 355 case TMF_RESP_FUNC_COMPLETE: 356 SAS_DPRINTK("%s: task 0x%p not at LU\n", 357 __func__, task); 358 return TASK_IS_NOT_AT_LU; 359 case TMF_RESP_FUNC_FAILED: 360 SAS_DPRINTK("%s: task 0x%p failed to abort\n", 361 __func__, task); 362 return TASK_ABORT_FAILED; 363 } 364 365 } 366 } 367 return res; 368} 369 370static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd) 371{ 372 int res = TMF_RESP_FUNC_FAILED; 373 struct scsi_lun lun; 374 struct sas_internal *i = 375 to_sas_internal(dev->port->ha->core.shost->transportt); 376 377 int_to_scsilun(cmd->device->lun, &lun); 378 379 SAS_DPRINTK("eh: device %llx LUN %x has the task\n", 380 SAS_ADDR(dev->sas_addr), 381 cmd->device->lun); 382 383 if (i->dft->lldd_abort_task_set) 384 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun); 385 386 if (res == TMF_RESP_FUNC_FAILED) { 387 if (i->dft->lldd_clear_task_set) 388 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun); 389 } 390 391 if (res == TMF_RESP_FUNC_FAILED) { 392 if (i->dft->lldd_lu_reset) 393 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); 394 } 395 396 return res; 397} 398 399static int sas_recover_I_T(struct domain_device *dev) 400{ 401 int res = TMF_RESP_FUNC_FAILED; 402 struct sas_internal *i = 403 to_sas_internal(dev->port->ha->core.shost->transportt); 404 405 SAS_DPRINTK("I_T nexus reset for dev %016llx\n", 406 SAS_ADDR(dev->sas_addr)); 407 408 if (i->dft->lldd_I_T_nexus_reset) 409 res = i->dft->lldd_I_T_nexus_reset(dev); 410 411 return res; 412} 413 414/* Find the sas_phy that's attached to this device */ 415struct sas_phy *sas_find_local_phy(struct domain_device *dev) 416{ 417 struct domain_device *pdev = dev->parent; 418 struct ex_phy *exphy = NULL; 419 int i; 420 421 /* Directly attached device */ 422 if (!pdev) 423 return dev->port->phy; 424 425 /* Otherwise look in the expander */ 426 for (i = 0; i < pdev->ex_dev.num_phys; i++) 427 if (!memcmp(dev->sas_addr, 428 pdev->ex_dev.ex_phy[i].attached_sas_addr, 429 SAS_ADDR_SIZE)) { 430 exphy = &pdev->ex_dev.ex_phy[i]; 431 break; 432 } 433 434 BUG_ON(!exphy); 435 return exphy->phy; 436} 437EXPORT_SYMBOL_GPL(sas_find_local_phy); 438 439/* Attempt to send a LUN reset message to a device */ 440int sas_eh_device_reset_handler(struct scsi_cmnd *cmd) 441{ 442 struct domain_device *dev = cmd_to_domain_dev(cmd); 443 struct sas_internal *i = 444 to_sas_internal(dev->port->ha->core.shost->transportt); 445 struct scsi_lun lun; 446 int res; 447 448 int_to_scsilun(cmd->device->lun, &lun); 449 450 if (!i->dft->lldd_lu_reset) 451 return FAILED; 452 453 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); 454 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) 455 return SUCCESS; 456 457 return FAILED; 458} 459 460/* Attempt to send a phy (bus) reset */ 461int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd) 462{ 463 struct domain_device *dev = cmd_to_domain_dev(cmd); 464 struct sas_phy *phy = sas_find_local_phy(dev); 465 int res; 466 467 res = sas_phy_reset(phy, 1); 468 if (res) 469 SAS_DPRINTK("Bus reset of %s failed 0x%x\n", 470 kobject_name(&phy->dev.kobj), 471 res); 472 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) 473 return SUCCESS; 474 475 return FAILED; 476} 477 478/* Try to reset a device */ 479static int try_to_reset_cmd_device(struct scsi_cmnd *cmd) 480{ 481 int res; 482 struct Scsi_Host *shost = cmd->device->host; 483 484 if (!shost->hostt->eh_device_reset_handler) 485 goto try_bus_reset; 486 487 res = shost->hostt->eh_device_reset_handler(cmd); 488 if (res == SUCCESS) 489 return res; 490 491try_bus_reset: 492 if (shost->hostt->eh_bus_reset_handler) 493 return shost->hostt->eh_bus_reset_handler(cmd); 494 495 return FAILED; 496} 497 498static int sas_eh_handle_sas_errors(struct Scsi_Host *shost, 499 struct list_head *work_q, 500 struct list_head *done_q) 501{ 502 struct scsi_cmnd *cmd, *n; 503 enum task_disposition res = TASK_IS_DONE; 504 int tmf_resp, need_reset; 505 struct sas_internal *i = to_sas_internal(shost->transportt); 506 unsigned long flags; 507 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 508 509Again: 510 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 511 struct sas_task *task = TO_SAS_TASK(cmd); 512 513 if (!task) 514 continue; 515 516 list_del_init(&cmd->eh_entry); 517 518 spin_lock_irqsave(&task->task_state_lock, flags); 519 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET; 520 spin_unlock_irqrestore(&task->task_state_lock, flags); 521 522 if (need_reset) { 523 SAS_DPRINTK("%s: task 0x%p requests reset\n", 524 __func__, task); 525 goto reset; 526 } 527 528 SAS_DPRINTK("trying to find task 0x%p\n", task); 529 res = sas_scsi_find_task(task); 530 531 cmd->eh_eflags = 0; 532 533 switch (res) { 534 case TASK_IS_DONE: 535 SAS_DPRINTK("%s: task 0x%p is done\n", __func__, 536 task); 537 sas_eh_finish_cmd(cmd); 538 continue; 539 case TASK_IS_ABORTED: 540 SAS_DPRINTK("%s: task 0x%p is aborted\n", 541 __func__, task); 542 sas_eh_finish_cmd(cmd); 543 continue; 544 case TASK_IS_AT_LU: 545 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task); 546 reset: 547 tmf_resp = sas_recover_lu(task->dev, cmd); 548 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { 549 SAS_DPRINTK("dev %016llx LU %x is " 550 "recovered\n", 551 SAS_ADDR(task->dev), 552 cmd->device->lun); 553 sas_eh_finish_cmd(cmd); 554 sas_scsi_clear_queue_lu(work_q, cmd); 555 goto Again; 556 } 557 /* fallthrough */ 558 case TASK_IS_NOT_AT_LU: 559 case TASK_ABORT_FAILED: 560 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n", 561 task); 562 tmf_resp = sas_recover_I_T(task->dev); 563 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { 564 struct domain_device *dev = task->dev; 565 SAS_DPRINTK("I_T %016llx recovered\n", 566 SAS_ADDR(task->dev->sas_addr)); 567 sas_eh_finish_cmd(cmd); 568 sas_scsi_clear_queue_I_T(work_q, dev); 569 goto Again; 570 } 571 /* Hammer time :-) */ 572 try_to_reset_cmd_device(cmd); 573 if (i->dft->lldd_clear_nexus_port) { 574 struct asd_sas_port *port = task->dev->port; 575 SAS_DPRINTK("clearing nexus for port:%d\n", 576 port->id); 577 res = i->dft->lldd_clear_nexus_port(port); 578 if (res == TMF_RESP_FUNC_COMPLETE) { 579 SAS_DPRINTK("clear nexus port:%d " 580 "succeeded\n", port->id); 581 sas_eh_finish_cmd(cmd); 582 sas_scsi_clear_queue_port(work_q, 583 port); 584 goto Again; 585 } 586 } 587 if (i->dft->lldd_clear_nexus_ha) { 588 SAS_DPRINTK("clear nexus ha\n"); 589 res = i->dft->lldd_clear_nexus_ha(ha); 590 if (res == TMF_RESP_FUNC_COMPLETE) { 591 SAS_DPRINTK("clear nexus ha " 592 "succeeded\n"); 593 sas_eh_finish_cmd(cmd); 594 goto clear_q; 595 } 596 } 597 /* If we are here -- this means that no amount 598 * of effort could recover from errors. Quite 599 * possibly the HA just disappeared. 600 */ 601 SAS_DPRINTK("error from device %llx, LUN %x " 602 "couldn't be recovered in any way\n", 603 SAS_ADDR(task->dev->sas_addr), 604 cmd->device->lun); 605 606 sas_eh_finish_cmd(cmd); 607 goto clear_q; 608 } 609 } 610 return list_empty(work_q); 611clear_q: 612 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__); 613 list_for_each_entry_safe(cmd, n, work_q, eh_entry) 614 sas_eh_finish_cmd(cmd); 615 616 return list_empty(work_q); 617} 618 619void sas_scsi_recover_host(struct Scsi_Host *shost) 620{ 621 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 622 unsigned long flags; 623 LIST_HEAD(eh_work_q); 624 625 spin_lock_irqsave(shost->host_lock, flags); 626 list_splice_init(&shost->eh_cmd_q, &eh_work_q); 627 shost->host_eh_scheduled = 0; 628 spin_unlock_irqrestore(shost->host_lock, flags); 629 630 SAS_DPRINTK("Enter %s\n", __func__); 631 /* 632 * Deal with commands that still have SAS tasks (i.e. they didn't 633 * complete via the normal sas_task completion mechanism) 634 */ 635 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q)) 636 goto out; 637 638 /* 639 * Now deal with SCSI commands that completed ok but have a an error 640 * code (and hopefully sense data) attached. This is roughly what 641 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any 642 * command we see here has no sas_task and is thus unknown to the HA. 643 */ 644 if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q)) 645 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q)) 646 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q); 647 648out: 649 /* now link into libata eh --- if we have any ata devices */ 650 sas_ata_strategy_handler(shost); 651 652 scsi_eh_flush_done_q(&ha->eh_done_q); 653 654 SAS_DPRINTK("--- Exit %s\n", __func__); 655 return; 656} 657 658enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd) 659{ 660 struct sas_task *task = TO_SAS_TASK(cmd); 661 unsigned long flags; 662 enum blk_eh_timer_return rtn; 663 664 if (sas_ata_timed_out(cmd, task, &rtn)) 665 return rtn; 666 667 if (!task) { 668 cmd->request->timeout /= 2; 669 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n", 670 cmd, task, (cmd->request->timeout ? 671 "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED")); 672 if (!cmd->request->timeout) 673 return BLK_EH_NOT_HANDLED; 674 return BLK_EH_RESET_TIMER; 675 } 676 677 spin_lock_irqsave(&task->task_state_lock, flags); 678 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED); 679 if (task->task_state_flags & SAS_TASK_STATE_DONE) { 680 spin_unlock_irqrestore(&task->task_state_lock, flags); 681 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: " 682 "BLK_EH_HANDLED\n", cmd, task); 683 return BLK_EH_HANDLED; 684 } 685 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) { 686 spin_unlock_irqrestore(&task->task_state_lock, flags); 687 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: " 688 "BLK_EH_RESET_TIMER\n", 689 cmd, task); 690 return BLK_EH_RESET_TIMER; 691 } 692 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 693 spin_unlock_irqrestore(&task->task_state_lock, flags); 694 695 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n", 696 cmd, task); 697 698 return BLK_EH_NOT_HANDLED; 699} 700 701int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) 702{ 703 struct domain_device *dev = sdev_to_domain_dev(sdev); 704 705 if (dev_is_sata(dev)) 706 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg); 707 708 return -EINVAL; 709} 710 711struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy) 712{ 713 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent); 714 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 715 struct domain_device *found_dev = NULL; 716 int i; 717 unsigned long flags; 718 719 spin_lock_irqsave(&ha->phy_port_lock, flags); 720 for (i = 0; i < ha->num_phys; i++) { 721 struct asd_sas_port *port = ha->sas_port[i]; 722 struct domain_device *dev; 723 724 spin_lock(&port->dev_list_lock); 725 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 726 if (rphy == dev->rphy) { 727 found_dev = dev; 728 spin_unlock(&port->dev_list_lock); 729 goto found; 730 } 731 } 732 spin_unlock(&port->dev_list_lock); 733 } 734 found: 735 spin_unlock_irqrestore(&ha->phy_port_lock, flags); 736 737 return found_dev; 738} 739 740int sas_target_alloc(struct scsi_target *starget) 741{ 742 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent); 743 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy); 744 int res; 745 746 if (!found_dev) 747 return -ENODEV; 748 749 if (dev_is_sata(found_dev)) { 750 res = sas_ata_init_host_and_port(found_dev, starget); 751 if (res) 752 return res; 753 } 754 755 kref_get(&found_dev->kref); 756 starget->hostdata = found_dev; 757 return 0; 758} 759 760#define SAS_DEF_QD 256 761 762int sas_slave_configure(struct scsi_device *scsi_dev) 763{ 764 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 765 struct sas_ha_struct *sas_ha; 766 767 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE); 768 769 if (dev_is_sata(dev)) { 770 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap); 771 return 0; 772 } 773 774 sas_ha = dev->port->ha; 775 776 sas_read_port_mode_page(scsi_dev); 777 778 if (scsi_dev->tagged_supported) { 779 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG); 780 scsi_activate_tcq(scsi_dev, SAS_DEF_QD); 781 } else { 782 SAS_DPRINTK("device %llx, LUN %x doesn't support " 783 "TCQ\n", SAS_ADDR(dev->sas_addr), 784 scsi_dev->lun); 785 scsi_dev->tagged_supported = 0; 786 scsi_set_tag_type(scsi_dev, 0); 787 scsi_deactivate_tcq(scsi_dev, 1); 788 } 789 790 scsi_dev->allow_restart = 1; 791 792 return 0; 793} 794 795int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason) 796{ 797 struct domain_device *dev = sdev_to_domain_dev(sdev); 798 799 if (dev_is_sata(dev)) 800 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth, 801 reason); 802 803 switch (reason) { 804 case SCSI_QDEPTH_DEFAULT: 805 case SCSI_QDEPTH_RAMP_UP: 806 if (!sdev->tagged_supported) 807 depth = 1; 808 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 809 break; 810 case SCSI_QDEPTH_QFULL: 811 scsi_track_queue_full(sdev, depth); 812 break; 813 default: 814 return -EOPNOTSUPP; 815 } 816 817 return depth; 818} 819 820int sas_change_queue_type(struct scsi_device *scsi_dev, int qt) 821{ 822 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 823 824 if (dev_is_sata(dev)) 825 return -EINVAL; 826 827 if (!scsi_dev->tagged_supported) 828 return 0; 829 830 scsi_deactivate_tcq(scsi_dev, 1); 831 832 scsi_set_tag_type(scsi_dev, qt); 833 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); 834 835 return qt; 836} 837 838int sas_bios_param(struct scsi_device *scsi_dev, 839 struct block_device *bdev, 840 sector_t capacity, int *hsc) 841{ 842 hsc[0] = 255; 843 hsc[1] = 63; 844 sector_div(capacity, 255*63); 845 hsc[2] = capacity; 846 847 return 0; 848} 849 850/* ---------- Task Collector Thread implementation ---------- */ 851 852static void sas_queue(struct sas_ha_struct *sas_ha) 853{ 854 struct scsi_core *core = &sas_ha->core; 855 unsigned long flags; 856 LIST_HEAD(q); 857 int can_queue; 858 int res; 859 struct sas_internal *i = to_sas_internal(core->shost->transportt); 860 861 spin_lock_irqsave(&core->task_queue_lock, flags); 862 while (!kthread_should_stop() && 863 !list_empty(&core->task_queue)) { 864 865 can_queue = sas_ha->lldd_queue_size - core->task_queue_size; 866 if (can_queue >= 0) { 867 can_queue = core->task_queue_size; 868 list_splice_init(&core->task_queue, &q); 869 } else { 870 struct list_head *a, *n; 871 872 can_queue = sas_ha->lldd_queue_size; 873 list_for_each_safe(a, n, &core->task_queue) { 874 list_move_tail(a, &q); 875 if (--can_queue == 0) 876 break; 877 } 878 can_queue = sas_ha->lldd_queue_size; 879 } 880 core->task_queue_size -= can_queue; 881 spin_unlock_irqrestore(&core->task_queue_lock, flags); 882 { 883 struct sas_task *task = list_entry(q.next, 884 struct sas_task, 885 list); 886 list_del_init(&q); 887 res = i->dft->lldd_execute_task(task, can_queue, 888 GFP_KERNEL); 889 if (unlikely(res)) 890 __list_add(&q, task->list.prev, &task->list); 891 } 892 spin_lock_irqsave(&core->task_queue_lock, flags); 893 if (res) { 894 list_splice_init(&q, &core->task_queue); /*at head*/ 895 core->task_queue_size += can_queue; 896 } 897 } 898 spin_unlock_irqrestore(&core->task_queue_lock, flags); 899} 900 901/** 902 * sas_queue_thread -- The Task Collector thread 903 * @_sas_ha: pointer to struct sas_ha 904 */ 905static int sas_queue_thread(void *_sas_ha) 906{ 907 struct sas_ha_struct *sas_ha = _sas_ha; 908 909 while (1) { 910 set_current_state(TASK_INTERRUPTIBLE); 911 schedule(); 912 sas_queue(sas_ha); 913 if (kthread_should_stop()) 914 break; 915 } 916 917 return 0; 918} 919 920int sas_init_queue(struct sas_ha_struct *sas_ha) 921{ 922 struct scsi_core *core = &sas_ha->core; 923 924 spin_lock_init(&core->task_queue_lock); 925 core->task_queue_size = 0; 926 INIT_LIST_HEAD(&core->task_queue); 927 928 core->queue_thread = kthread_run(sas_queue_thread, sas_ha, 929 "sas_queue_%d", core->shost->host_no); 930 if (IS_ERR(core->queue_thread)) 931 return PTR_ERR(core->queue_thread); 932 return 0; 933} 934 935void sas_shutdown_queue(struct sas_ha_struct *sas_ha) 936{ 937 unsigned long flags; 938 struct scsi_core *core = &sas_ha->core; 939 struct sas_task *task, *n; 940 941 kthread_stop(core->queue_thread); 942 943 if (!list_empty(&core->task_queue)) 944 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n", 945 SAS_ADDR(sas_ha->sas_addr)); 946 947 spin_lock_irqsave(&core->task_queue_lock, flags); 948 list_for_each_entry_safe(task, n, &core->task_queue, list) { 949 struct scsi_cmnd *cmd = task->uldd_task; 950 951 list_del_init(&task->list); 952 953 ASSIGN_SAS_TASK(cmd, NULL); 954 sas_free_task(task); 955 cmd->result = DID_ABORT << 16; 956 cmd->scsi_done(cmd); 957 } 958 spin_unlock_irqrestore(&core->task_queue_lock, flags); 959} 960 961/* 962 * Call the LLDD task abort routine directly. This function is intended for 963 * use by upper layers that need to tell the LLDD to abort a task. 964 */ 965int __sas_task_abort(struct sas_task *task) 966{ 967 struct sas_internal *si = 968 to_sas_internal(task->dev->port->ha->core.shost->transportt); 969 unsigned long flags; 970 int res; 971 972 spin_lock_irqsave(&task->task_state_lock, flags); 973 if (task->task_state_flags & SAS_TASK_STATE_ABORTED || 974 task->task_state_flags & SAS_TASK_STATE_DONE) { 975 spin_unlock_irqrestore(&task->task_state_lock, flags); 976 SAS_DPRINTK("%s: Task %p already finished.\n", __func__, 977 task); 978 return 0; 979 } 980 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 981 spin_unlock_irqrestore(&task->task_state_lock, flags); 982 983 if (!si->dft->lldd_abort_task) 984 return -ENODEV; 985 986 res = si->dft->lldd_abort_task(task); 987 988 spin_lock_irqsave(&task->task_state_lock, flags); 989 if ((task->task_state_flags & SAS_TASK_STATE_DONE) || 990 (res == TMF_RESP_FUNC_COMPLETE)) 991 { 992 spin_unlock_irqrestore(&task->task_state_lock, flags); 993 task->task_done(task); 994 return 0; 995 } 996 997 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 998 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 999 spin_unlock_irqrestore(&task->task_state_lock, flags); 1000 1001 return -EAGAIN; 1002} 1003 1004/* 1005 * Tell an upper layer that it needs to initiate an abort for a given task. 1006 * This should only ever be called by an LLDD. 1007 */ 1008void sas_task_abort(struct sas_task *task) 1009{ 1010 struct scsi_cmnd *sc = task->uldd_task; 1011 1012 /* Escape for libsas internal commands */ 1013 if (!sc) { 1014 if (!del_timer(&task->timer)) 1015 return; 1016 task->timer.function(task->timer.data); 1017 return; 1018 } 1019 1020 if (dev_is_sata(task->dev)) { 1021 sas_ata_task_abort(task); 1022 } else { 1023 struct request_queue *q = sc->device->request_queue; 1024 unsigned long flags; 1025 1026 spin_lock_irqsave(q->queue_lock, flags); 1027 blk_abort_request(sc->request); 1028 spin_unlock_irqrestore(q->queue_lock, flags); 1029 scsi_schedule_eh(sc->device->host); 1030 } 1031} 1032 1033int sas_slave_alloc(struct scsi_device *scsi_dev) 1034{ 1035 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 1036 1037 if (dev_is_sata(dev)) 1038 return ata_sas_port_init(dev->sata_dev.ap); 1039 1040 return 0; 1041} 1042 1043void sas_target_destroy(struct scsi_target *starget) 1044{ 1045 struct domain_device *found_dev = starget->hostdata; 1046 1047 if (!found_dev) 1048 return; 1049 1050 if (dev_is_sata(found_dev)) 1051 ata_sas_port_destroy(found_dev->sata_dev.ap); 1052 1053 starget->hostdata = NULL; 1054 sas_put_device(found_dev); 1055} 1056 1057static void sas_parse_addr(u8 *sas_addr, const char *p) 1058{ 1059 int i; 1060 for (i = 0; i < SAS_ADDR_SIZE; i++) { 1061 u8 h, l; 1062 if (!*p) 1063 break; 1064 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; 1065 p++; 1066 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; 1067 p++; 1068 sas_addr[i] = (h<<4) | l; 1069 } 1070} 1071 1072#define SAS_STRING_ADDR_SIZE 16 1073 1074int sas_request_addr(struct Scsi_Host *shost, u8 *addr) 1075{ 1076 int res; 1077 const struct firmware *fw; 1078 1079 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev); 1080 if (res) 1081 return res; 1082 1083 if (fw->size < SAS_STRING_ADDR_SIZE) { 1084 res = -ENODEV; 1085 goto out; 1086 } 1087 1088 sas_parse_addr(addr, fw->data); 1089 1090out: 1091 release_firmware(fw); 1092 return res; 1093} 1094EXPORT_SYMBOL_GPL(sas_request_addr); 1095 1096EXPORT_SYMBOL_GPL(sas_queuecommand); 1097EXPORT_SYMBOL_GPL(sas_target_alloc); 1098EXPORT_SYMBOL_GPL(sas_slave_configure); 1099EXPORT_SYMBOL_GPL(sas_change_queue_depth); 1100EXPORT_SYMBOL_GPL(sas_change_queue_type); 1101EXPORT_SYMBOL_GPL(sas_bios_param); 1102EXPORT_SYMBOL_GPL(__sas_task_abort); 1103EXPORT_SYMBOL_GPL(sas_task_abort); 1104EXPORT_SYMBOL_GPL(sas_phy_reset); 1105EXPORT_SYMBOL_GPL(sas_phy_enable); 1106EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler); 1107EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler); 1108EXPORT_SYMBOL_GPL(sas_slave_alloc); 1109EXPORT_SYMBOL_GPL(sas_target_destroy); 1110EXPORT_SYMBOL_GPL(sas_ioctl); 1111