sas_scsi_host.c revision cadbd4a5e36dde7e6c49b587b2c419103c0b7218
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/ctype.h> 29 30#include "sas_internal.h" 31 32#include <scsi/scsi_host.h> 33#include <scsi/scsi_device.h> 34#include <scsi/scsi_tcq.h> 35#include <scsi/scsi.h> 36#include <scsi/scsi_eh.h> 37#include <scsi/scsi_transport.h> 38#include <scsi/scsi_transport_sas.h> 39#include <scsi/sas_ata.h> 40#include "../scsi_sas_internal.h" 41#include "../scsi_transport_api.h" 42#include "../scsi_priv.h" 43 44#include <linux/err.h> 45#include <linux/blkdev.h> 46#include <linux/freezer.h> 47#include <linux/scatterlist.h> 48#include <linux/libata.h> 49 50/* ---------- SCSI Host glue ---------- */ 51 52static void sas_scsi_task_done(struct sas_task *task) 53{ 54 struct task_status_struct *ts = &task->task_status; 55 struct scsi_cmnd *sc = task->uldd_task; 56 int hs = 0, stat = 0; 57 58 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) { 59 /* Aborted tasks will be completed by the error handler */ 60 SAS_DPRINTK("task done but aborted\n"); 61 return; 62 } 63 64 if (unlikely(!sc)) { 65 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n"); 66 list_del_init(&task->list); 67 sas_free_task(task); 68 return; 69 } 70 71 if (ts->resp == SAS_TASK_UNDELIVERED) { 72 /* transport error */ 73 hs = DID_NO_CONNECT; 74 } else { /* ts->resp == SAS_TASK_COMPLETE */ 75 /* task delivered, what happened afterwards? */ 76 switch (ts->stat) { 77 case SAS_DEV_NO_RESPONSE: 78 case SAS_INTERRUPTED: 79 case SAS_PHY_DOWN: 80 case SAS_NAK_R_ERR: 81 case SAS_OPEN_TO: 82 hs = DID_NO_CONNECT; 83 break; 84 case SAS_DATA_UNDERRUN: 85 scsi_set_resid(sc, ts->residual); 86 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow) 87 hs = DID_ERROR; 88 break; 89 case SAS_DATA_OVERRUN: 90 hs = DID_ERROR; 91 break; 92 case SAS_QUEUE_FULL: 93 hs = DID_SOFT_ERROR; /* retry */ 94 break; 95 case SAS_DEVICE_UNKNOWN: 96 hs = DID_BAD_TARGET; 97 break; 98 case SAS_SG_ERR: 99 hs = DID_PARITY; 100 break; 101 case SAS_OPEN_REJECT: 102 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY) 103 hs = DID_SOFT_ERROR; /* retry */ 104 else 105 hs = DID_ERROR; 106 break; 107 case SAS_PROTO_RESPONSE: 108 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP " 109 "task; please report this\n", 110 task->dev->port->ha->sas_ha_name); 111 break; 112 case SAS_ABORTED_TASK: 113 hs = DID_ABORT; 114 break; 115 case SAM_CHECK_COND: 116 memcpy(sc->sense_buffer, ts->buf, 117 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size)); 118 stat = SAM_CHECK_COND; 119 break; 120 default: 121 stat = ts->stat; 122 break; 123 } 124 } 125 ASSIGN_SAS_TASK(sc, NULL); 126 sc->result = (hs << 16) | stat; 127 list_del_init(&task->list); 128 sas_free_task(task); 129 sc->scsi_done(sc); 130} 131 132static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd) 133{ 134 enum task_attribute ta = TASK_ATTR_SIMPLE; 135 if (cmd->request && blk_rq_tagged(cmd->request)) { 136 if (cmd->device->ordered_tags && 137 (cmd->request->cmd_flags & REQ_HARDBARRIER)) 138 ta = TASK_ATTR_ORDERED; 139 } 140 return ta; 141} 142 143static struct sas_task *sas_create_task(struct scsi_cmnd *cmd, 144 struct domain_device *dev, 145 gfp_t gfp_flags) 146{ 147 struct sas_task *task = sas_alloc_task(gfp_flags); 148 struct scsi_lun lun; 149 150 if (!task) 151 return NULL; 152 153 task->uldd_task = cmd; 154 ASSIGN_SAS_TASK(cmd, task); 155 156 task->dev = dev; 157 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */ 158 159 task->ssp_task.retry_count = 1; 160 int_to_scsilun(cmd->device->lun, &lun); 161 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8); 162 task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd); 163 memcpy(task->ssp_task.cdb, cmd->cmnd, 16); 164 165 task->scatter = scsi_sglist(cmd); 166 task->num_scatter = scsi_sg_count(cmd); 167 task->total_xfer_len = scsi_bufflen(cmd); 168 task->data_dir = cmd->sc_data_direction; 169 170 task->task_done = sas_scsi_task_done; 171 172 return task; 173} 174 175int sas_queue_up(struct sas_task *task) 176{ 177 struct sas_ha_struct *sas_ha = task->dev->port->ha; 178 struct scsi_core *core = &sas_ha->core; 179 unsigned long flags; 180 LIST_HEAD(list); 181 182 spin_lock_irqsave(&core->task_queue_lock, flags); 183 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) { 184 spin_unlock_irqrestore(&core->task_queue_lock, flags); 185 return -SAS_QUEUE_FULL; 186 } 187 list_add_tail(&task->list, &core->task_queue); 188 core->task_queue_size += 1; 189 spin_unlock_irqrestore(&core->task_queue_lock, flags); 190 wake_up_process(core->queue_thread); 191 192 return 0; 193} 194 195/** 196 * sas_queuecommand -- Enqueue a command for processing 197 * @parameters: See SCSI Core documentation 198 * 199 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can 200 * call us without holding an IRQ spinlock... 201 */ 202int sas_queuecommand(struct scsi_cmnd *cmd, 203 void (*scsi_done)(struct scsi_cmnd *)) 204 __releases(host->host_lock) 205 __acquires(dev->sata_dev.ap->lock) 206 __releases(dev->sata_dev.ap->lock) 207 __acquires(host->host_lock) 208{ 209 int res = 0; 210 struct domain_device *dev = cmd_to_domain_dev(cmd); 211 struct Scsi_Host *host = cmd->device->host; 212 struct sas_internal *i = to_sas_internal(host->transportt); 213 214 spin_unlock_irq(host->host_lock); 215 216 { 217 struct sas_ha_struct *sas_ha = dev->port->ha; 218 struct sas_task *task; 219 220 if (dev_is_sata(dev)) { 221 unsigned long flags; 222 223 spin_lock_irqsave(dev->sata_dev.ap->lock, flags); 224 res = ata_sas_queuecmd(cmd, scsi_done, 225 dev->sata_dev.ap); 226 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags); 227 goto out; 228 } 229 230 res = -ENOMEM; 231 task = sas_create_task(cmd, dev, GFP_ATOMIC); 232 if (!task) 233 goto out; 234 235 cmd->scsi_done = scsi_done; 236 /* Queue up, Direct Mode or Task Collector Mode. */ 237 if (sas_ha->lldd_max_execute_num < 2) 238 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); 239 else 240 res = sas_queue_up(task); 241 242 /* Examine */ 243 if (res) { 244 SAS_DPRINTK("lldd_execute_task returned: %d\n", res); 245 ASSIGN_SAS_TASK(cmd, NULL); 246 sas_free_task(task); 247 if (res == -SAS_QUEUE_FULL) { 248 cmd->result = DID_SOFT_ERROR << 16; /* retry */ 249 res = 0; 250 scsi_done(cmd); 251 } 252 goto out; 253 } 254 } 255out: 256 spin_lock_irq(host->host_lock); 257 return res; 258} 259 260static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) 261{ 262 struct sas_task *task = TO_SAS_TASK(cmd); 263 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host); 264 265 /* remove the aborted task flag to allow the task to be 266 * completed now. At this point, we only get called following 267 * an actual abort of the task, so we should be guaranteed not 268 * to be racing with any completions from the LLD (hence we 269 * don't need the task state lock to clear the flag) */ 270 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 271 /* Now call task_done. However, task will be free'd after 272 * this */ 273 task->task_done(task); 274 /* now finish the command and move it on to the error 275 * handler done list, this also takes it off the 276 * error handler pending list */ 277 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q); 278} 279 280static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd) 281{ 282 struct scsi_cmnd *cmd, *n; 283 284 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 285 if (cmd->device->sdev_target == my_cmd->device->sdev_target && 286 cmd->device->lun == my_cmd->device->lun) 287 sas_eh_finish_cmd(cmd); 288 } 289} 290 291static void sas_scsi_clear_queue_I_T(struct list_head *error_q, 292 struct domain_device *dev) 293{ 294 struct scsi_cmnd *cmd, *n; 295 296 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 297 struct domain_device *x = cmd_to_domain_dev(cmd); 298 299 if (x == dev) 300 sas_eh_finish_cmd(cmd); 301 } 302} 303 304static void sas_scsi_clear_queue_port(struct list_head *error_q, 305 struct asd_sas_port *port) 306{ 307 struct scsi_cmnd *cmd, *n; 308 309 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 310 struct domain_device *dev = cmd_to_domain_dev(cmd); 311 struct asd_sas_port *x = dev->port; 312 313 if (x == port) 314 sas_eh_finish_cmd(cmd); 315 } 316} 317 318enum task_disposition { 319 TASK_IS_DONE, 320 TASK_IS_ABORTED, 321 TASK_IS_AT_LU, 322 TASK_IS_NOT_AT_LU, 323 TASK_ABORT_FAILED, 324}; 325 326static enum task_disposition sas_scsi_find_task(struct sas_task *task) 327{ 328 struct sas_ha_struct *ha = task->dev->port->ha; 329 unsigned long flags; 330 int i, res; 331 struct sas_internal *si = 332 to_sas_internal(task->dev->port->ha->core.shost->transportt); 333 334 if (ha->lldd_max_execute_num > 1) { 335 struct scsi_core *core = &ha->core; 336 struct sas_task *t, *n; 337 338 spin_lock_irqsave(&core->task_queue_lock, flags); 339 list_for_each_entry_safe(t, n, &core->task_queue, list) { 340 if (task == t) { 341 list_del_init(&t->list); 342 spin_unlock_irqrestore(&core->task_queue_lock, 343 flags); 344 SAS_DPRINTK("%s: task 0x%p aborted from " 345 "task_queue\n", 346 __func__, task); 347 return TASK_IS_ABORTED; 348 } 349 } 350 spin_unlock_irqrestore(&core->task_queue_lock, flags); 351 } 352 353 for (i = 0; i < 5; i++) { 354 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task); 355 res = si->dft->lldd_abort_task(task); 356 357 spin_lock_irqsave(&task->task_state_lock, flags); 358 if (task->task_state_flags & SAS_TASK_STATE_DONE) { 359 spin_unlock_irqrestore(&task->task_state_lock, flags); 360 SAS_DPRINTK("%s: task 0x%p is done\n", __func__, 361 task); 362 return TASK_IS_DONE; 363 } 364 spin_unlock_irqrestore(&task->task_state_lock, flags); 365 366 if (res == TMF_RESP_FUNC_COMPLETE) { 367 SAS_DPRINTK("%s: task 0x%p is aborted\n", 368 __func__, task); 369 return TASK_IS_ABORTED; 370 } else if (si->dft->lldd_query_task) { 371 SAS_DPRINTK("%s: querying task 0x%p\n", 372 __func__, task); 373 res = si->dft->lldd_query_task(task); 374 switch (res) { 375 case TMF_RESP_FUNC_SUCC: 376 SAS_DPRINTK("%s: task 0x%p at LU\n", 377 __func__, task); 378 return TASK_IS_AT_LU; 379 case TMF_RESP_FUNC_COMPLETE: 380 SAS_DPRINTK("%s: task 0x%p not at LU\n", 381 __func__, task); 382 return TASK_IS_NOT_AT_LU; 383 case TMF_RESP_FUNC_FAILED: 384 SAS_DPRINTK("%s: task 0x%p failed to abort\n", 385 __func__, task); 386 return TASK_ABORT_FAILED; 387 } 388 389 } 390 } 391 return res; 392} 393 394static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd) 395{ 396 int res = TMF_RESP_FUNC_FAILED; 397 struct scsi_lun lun; 398 struct sas_internal *i = 399 to_sas_internal(dev->port->ha->core.shost->transportt); 400 401 int_to_scsilun(cmd->device->lun, &lun); 402 403 SAS_DPRINTK("eh: device %llx LUN %x has the task\n", 404 SAS_ADDR(dev->sas_addr), 405 cmd->device->lun); 406 407 if (i->dft->lldd_abort_task_set) 408 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun); 409 410 if (res == TMF_RESP_FUNC_FAILED) { 411 if (i->dft->lldd_clear_task_set) 412 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun); 413 } 414 415 if (res == TMF_RESP_FUNC_FAILED) { 416 if (i->dft->lldd_lu_reset) 417 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); 418 } 419 420 return res; 421} 422 423static int sas_recover_I_T(struct domain_device *dev) 424{ 425 int res = TMF_RESP_FUNC_FAILED; 426 struct sas_internal *i = 427 to_sas_internal(dev->port->ha->core.shost->transportt); 428 429 SAS_DPRINTK("I_T nexus reset for dev %016llx\n", 430 SAS_ADDR(dev->sas_addr)); 431 432 if (i->dft->lldd_I_T_nexus_reset) 433 res = i->dft->lldd_I_T_nexus_reset(dev); 434 435 return res; 436} 437 438/* Find the sas_phy that's attached to this device */ 439struct sas_phy *sas_find_local_phy(struct domain_device *dev) 440{ 441 struct domain_device *pdev = dev->parent; 442 struct ex_phy *exphy = NULL; 443 int i; 444 445 /* Directly attached device */ 446 if (!pdev) 447 return dev->port->phy; 448 449 /* Otherwise look in the expander */ 450 for (i = 0; i < pdev->ex_dev.num_phys; i++) 451 if (!memcmp(dev->sas_addr, 452 pdev->ex_dev.ex_phy[i].attached_sas_addr, 453 SAS_ADDR_SIZE)) { 454 exphy = &pdev->ex_dev.ex_phy[i]; 455 break; 456 } 457 458 BUG_ON(!exphy); 459 return exphy->phy; 460} 461EXPORT_SYMBOL_GPL(sas_find_local_phy); 462 463/* Attempt to send a LUN reset message to a device */ 464int sas_eh_device_reset_handler(struct scsi_cmnd *cmd) 465{ 466 struct domain_device *dev = cmd_to_domain_dev(cmd); 467 struct sas_internal *i = 468 to_sas_internal(dev->port->ha->core.shost->transportt); 469 struct scsi_lun lun; 470 int res; 471 472 int_to_scsilun(cmd->device->lun, &lun); 473 474 if (!i->dft->lldd_lu_reset) 475 return FAILED; 476 477 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); 478 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) 479 return SUCCESS; 480 481 return FAILED; 482} 483 484/* Attempt to send a phy (bus) reset */ 485int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd) 486{ 487 struct domain_device *dev = cmd_to_domain_dev(cmd); 488 struct sas_phy *phy = sas_find_local_phy(dev); 489 int res; 490 491 res = sas_phy_reset(phy, 1); 492 if (res) 493 SAS_DPRINTK("Bus reset of %s failed 0x%x\n", 494 kobject_name(&phy->dev.kobj), 495 res); 496 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) 497 return SUCCESS; 498 499 return FAILED; 500} 501 502/* Try to reset a device */ 503static int try_to_reset_cmd_device(struct scsi_cmnd *cmd) 504{ 505 int res; 506 struct Scsi_Host *shost = cmd->device->host; 507 508 if (!shost->hostt->eh_device_reset_handler) 509 goto try_bus_reset; 510 511 res = shost->hostt->eh_device_reset_handler(cmd); 512 if (res == SUCCESS) 513 return res; 514 515try_bus_reset: 516 if (shost->hostt->eh_bus_reset_handler) 517 return shost->hostt->eh_bus_reset_handler(cmd); 518 519 return FAILED; 520} 521 522static int sas_eh_handle_sas_errors(struct Scsi_Host *shost, 523 struct list_head *work_q, 524 struct list_head *done_q) 525{ 526 struct scsi_cmnd *cmd, *n; 527 enum task_disposition res = TASK_IS_DONE; 528 int tmf_resp, need_reset; 529 struct sas_internal *i = to_sas_internal(shost->transportt); 530 unsigned long flags; 531 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 532 533Again: 534 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 535 struct sas_task *task = TO_SAS_TASK(cmd); 536 537 if (!task) 538 continue; 539 540 list_del_init(&cmd->eh_entry); 541 542 spin_lock_irqsave(&task->task_state_lock, flags); 543 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET; 544 spin_unlock_irqrestore(&task->task_state_lock, flags); 545 546 if (need_reset) { 547 SAS_DPRINTK("%s: task 0x%p requests reset\n", 548 __func__, task); 549 goto reset; 550 } 551 552 SAS_DPRINTK("trying to find task 0x%p\n", task); 553 res = sas_scsi_find_task(task); 554 555 cmd->eh_eflags = 0; 556 557 switch (res) { 558 case TASK_IS_DONE: 559 SAS_DPRINTK("%s: task 0x%p is done\n", __func__, 560 task); 561 sas_eh_finish_cmd(cmd); 562 continue; 563 case TASK_IS_ABORTED: 564 SAS_DPRINTK("%s: task 0x%p is aborted\n", 565 __func__, task); 566 sas_eh_finish_cmd(cmd); 567 continue; 568 case TASK_IS_AT_LU: 569 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task); 570 reset: 571 tmf_resp = sas_recover_lu(task->dev, cmd); 572 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { 573 SAS_DPRINTK("dev %016llx LU %x is " 574 "recovered\n", 575 SAS_ADDR(task->dev), 576 cmd->device->lun); 577 sas_eh_finish_cmd(cmd); 578 sas_scsi_clear_queue_lu(work_q, cmd); 579 goto Again; 580 } 581 /* fallthrough */ 582 case TASK_IS_NOT_AT_LU: 583 case TASK_ABORT_FAILED: 584 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n", 585 task); 586 tmf_resp = sas_recover_I_T(task->dev); 587 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { 588 struct domain_device *dev = task->dev; 589 SAS_DPRINTK("I_T %016llx recovered\n", 590 SAS_ADDR(task->dev->sas_addr)); 591 sas_eh_finish_cmd(cmd); 592 sas_scsi_clear_queue_I_T(work_q, dev); 593 goto Again; 594 } 595 /* Hammer time :-) */ 596 try_to_reset_cmd_device(cmd); 597 if (i->dft->lldd_clear_nexus_port) { 598 struct asd_sas_port *port = task->dev->port; 599 SAS_DPRINTK("clearing nexus for port:%d\n", 600 port->id); 601 res = i->dft->lldd_clear_nexus_port(port); 602 if (res == TMF_RESP_FUNC_COMPLETE) { 603 SAS_DPRINTK("clear nexus port:%d " 604 "succeeded\n", port->id); 605 sas_eh_finish_cmd(cmd); 606 sas_scsi_clear_queue_port(work_q, 607 port); 608 goto Again; 609 } 610 } 611 if (i->dft->lldd_clear_nexus_ha) { 612 SAS_DPRINTK("clear nexus ha\n"); 613 res = i->dft->lldd_clear_nexus_ha(ha); 614 if (res == TMF_RESP_FUNC_COMPLETE) { 615 SAS_DPRINTK("clear nexus ha " 616 "succeeded\n"); 617 sas_eh_finish_cmd(cmd); 618 goto clear_q; 619 } 620 } 621 /* If we are here -- this means that no amount 622 * of effort could recover from errors. Quite 623 * possibly the HA just disappeared. 624 */ 625 SAS_DPRINTK("error from device %llx, LUN %x " 626 "couldn't be recovered in any way\n", 627 SAS_ADDR(task->dev->sas_addr), 628 cmd->device->lun); 629 630 sas_eh_finish_cmd(cmd); 631 goto clear_q; 632 } 633 } 634 return list_empty(work_q); 635clear_q: 636 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__); 637 list_for_each_entry_safe(cmd, n, work_q, eh_entry) 638 sas_eh_finish_cmd(cmd); 639 640 return list_empty(work_q); 641} 642 643void sas_scsi_recover_host(struct Scsi_Host *shost) 644{ 645 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 646 unsigned long flags; 647 LIST_HEAD(eh_work_q); 648 649 spin_lock_irqsave(shost->host_lock, flags); 650 list_splice_init(&shost->eh_cmd_q, &eh_work_q); 651 spin_unlock_irqrestore(shost->host_lock, flags); 652 653 SAS_DPRINTK("Enter %s\n", __func__); 654 /* 655 * Deal with commands that still have SAS tasks (i.e. they didn't 656 * complete via the normal sas_task completion mechanism) 657 */ 658 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q)) 659 goto out; 660 661 /* 662 * Now deal with SCSI commands that completed ok but have a an error 663 * code (and hopefully sense data) attached. This is roughly what 664 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any 665 * command we see here has no sas_task and is thus unknown to the HA. 666 */ 667 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q)) 668 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q); 669 670out: 671 scsi_eh_flush_done_q(&ha->eh_done_q); 672 SAS_DPRINTK("--- Exit %s\n", __func__); 673 return; 674} 675 676enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd) 677{ 678 struct sas_task *task = TO_SAS_TASK(cmd); 679 unsigned long flags; 680 681 if (!task) { 682 cmd->timeout_per_command /= 2; 683 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n", 684 cmd, task, (cmd->timeout_per_command ? 685 "EH_RESET_TIMER" : "EH_NOT_HANDLED")); 686 if (!cmd->timeout_per_command) 687 return EH_NOT_HANDLED; 688 return EH_RESET_TIMER; 689 } 690 691 spin_lock_irqsave(&task->task_state_lock, flags); 692 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED); 693 if (task->task_state_flags & SAS_TASK_STATE_DONE) { 694 spin_unlock_irqrestore(&task->task_state_lock, flags); 695 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n", 696 cmd, task); 697 return EH_HANDLED; 698 } 699 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) { 700 spin_unlock_irqrestore(&task->task_state_lock, flags); 701 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: " 702 "EH_RESET_TIMER\n", 703 cmd, task); 704 return EH_RESET_TIMER; 705 } 706 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 707 spin_unlock_irqrestore(&task->task_state_lock, flags); 708 709 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n", 710 cmd, task); 711 712 return EH_NOT_HANDLED; 713} 714 715int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) 716{ 717 struct domain_device *dev = sdev_to_domain_dev(sdev); 718 719 if (dev_is_sata(dev)) 720 return ata_scsi_ioctl(sdev, cmd, arg); 721 722 return -EINVAL; 723} 724 725struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy) 726{ 727 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent); 728 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 729 struct domain_device *found_dev = NULL; 730 int i; 731 unsigned long flags; 732 733 spin_lock_irqsave(&ha->phy_port_lock, flags); 734 for (i = 0; i < ha->num_phys; i++) { 735 struct asd_sas_port *port = ha->sas_port[i]; 736 struct domain_device *dev; 737 738 spin_lock(&port->dev_list_lock); 739 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 740 if (rphy == dev->rphy) { 741 found_dev = dev; 742 spin_unlock(&port->dev_list_lock); 743 goto found; 744 } 745 } 746 spin_unlock(&port->dev_list_lock); 747 } 748 found: 749 spin_unlock_irqrestore(&ha->phy_port_lock, flags); 750 751 return found_dev; 752} 753 754static inline struct domain_device *sas_find_target(struct scsi_target *starget) 755{ 756 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent); 757 758 return sas_find_dev_by_rphy(rphy); 759} 760 761int sas_target_alloc(struct scsi_target *starget) 762{ 763 struct domain_device *found_dev = sas_find_target(starget); 764 int res; 765 766 if (!found_dev) 767 return -ENODEV; 768 769 if (dev_is_sata(found_dev)) { 770 res = sas_ata_init_host_and_port(found_dev, starget); 771 if (res) 772 return res; 773 } 774 775 starget->hostdata = found_dev; 776 return 0; 777} 778 779#define SAS_DEF_QD 32 780#define SAS_MAX_QD 64 781 782int sas_slave_configure(struct scsi_device *scsi_dev) 783{ 784 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 785 struct sas_ha_struct *sas_ha; 786 787 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE); 788 789 if (dev_is_sata(dev)) { 790 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap); 791 return 0; 792 } 793 794 sas_ha = dev->port->ha; 795 796 sas_read_port_mode_page(scsi_dev); 797 798 if (scsi_dev->tagged_supported) { 799 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG); 800 scsi_activate_tcq(scsi_dev, SAS_DEF_QD); 801 } else { 802 SAS_DPRINTK("device %llx, LUN %x doesn't support " 803 "TCQ\n", SAS_ADDR(dev->sas_addr), 804 scsi_dev->lun); 805 scsi_dev->tagged_supported = 0; 806 scsi_set_tag_type(scsi_dev, 0); 807 scsi_deactivate_tcq(scsi_dev, 1); 808 } 809 810 scsi_dev->allow_restart = 1; 811 812 return 0; 813} 814 815void sas_slave_destroy(struct scsi_device *scsi_dev) 816{ 817 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 818 819 if (dev_is_sata(dev)) 820 ata_port_disable(dev->sata_dev.ap); 821} 822 823int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth) 824{ 825 int res = min(new_depth, SAS_MAX_QD); 826 827 if (scsi_dev->tagged_supported) 828 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), 829 res); 830 else { 831 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 832 sas_printk("device %llx LUN %x queue depth changed to 1\n", 833 SAS_ADDR(dev->sas_addr), 834 scsi_dev->lun); 835 scsi_adjust_queue_depth(scsi_dev, 0, 1); 836 res = 1; 837 } 838 839 return res; 840} 841 842int sas_change_queue_type(struct scsi_device *scsi_dev, int qt) 843{ 844 if (!scsi_dev->tagged_supported) 845 return 0; 846 847 scsi_deactivate_tcq(scsi_dev, 1); 848 849 scsi_set_tag_type(scsi_dev, qt); 850 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); 851 852 return qt; 853} 854 855int sas_bios_param(struct scsi_device *scsi_dev, 856 struct block_device *bdev, 857 sector_t capacity, int *hsc) 858{ 859 hsc[0] = 255; 860 hsc[1] = 63; 861 sector_div(capacity, 255*63); 862 hsc[2] = capacity; 863 864 return 0; 865} 866 867/* ---------- Task Collector Thread implementation ---------- */ 868 869static void sas_queue(struct sas_ha_struct *sas_ha) 870{ 871 struct scsi_core *core = &sas_ha->core; 872 unsigned long flags; 873 LIST_HEAD(q); 874 int can_queue; 875 int res; 876 struct sas_internal *i = to_sas_internal(core->shost->transportt); 877 878 spin_lock_irqsave(&core->task_queue_lock, flags); 879 while (!kthread_should_stop() && 880 !list_empty(&core->task_queue)) { 881 882 can_queue = sas_ha->lldd_queue_size - core->task_queue_size; 883 if (can_queue >= 0) { 884 can_queue = core->task_queue_size; 885 list_splice_init(&core->task_queue, &q); 886 } else { 887 struct list_head *a, *n; 888 889 can_queue = sas_ha->lldd_queue_size; 890 list_for_each_safe(a, n, &core->task_queue) { 891 list_move_tail(a, &q); 892 if (--can_queue == 0) 893 break; 894 } 895 can_queue = sas_ha->lldd_queue_size; 896 } 897 core->task_queue_size -= can_queue; 898 spin_unlock_irqrestore(&core->task_queue_lock, flags); 899 { 900 struct sas_task *task = list_entry(q.next, 901 struct sas_task, 902 list); 903 list_del_init(&q); 904 res = i->dft->lldd_execute_task(task, can_queue, 905 GFP_KERNEL); 906 if (unlikely(res)) 907 __list_add(&q, task->list.prev, &task->list); 908 } 909 spin_lock_irqsave(&core->task_queue_lock, flags); 910 if (res) { 911 list_splice_init(&q, &core->task_queue); /*at head*/ 912 core->task_queue_size += can_queue; 913 } 914 } 915 spin_unlock_irqrestore(&core->task_queue_lock, flags); 916} 917 918/** 919 * sas_queue_thread -- The Task Collector thread 920 * @_sas_ha: pointer to struct sas_ha 921 */ 922static int sas_queue_thread(void *_sas_ha) 923{ 924 struct sas_ha_struct *sas_ha = _sas_ha; 925 926 while (1) { 927 set_current_state(TASK_INTERRUPTIBLE); 928 schedule(); 929 sas_queue(sas_ha); 930 if (kthread_should_stop()) 931 break; 932 } 933 934 return 0; 935} 936 937int sas_init_queue(struct sas_ha_struct *sas_ha) 938{ 939 struct scsi_core *core = &sas_ha->core; 940 941 spin_lock_init(&core->task_queue_lock); 942 core->task_queue_size = 0; 943 INIT_LIST_HEAD(&core->task_queue); 944 945 core->queue_thread = kthread_run(sas_queue_thread, sas_ha, 946 "sas_queue_%d", core->shost->host_no); 947 if (IS_ERR(core->queue_thread)) 948 return PTR_ERR(core->queue_thread); 949 return 0; 950} 951 952void sas_shutdown_queue(struct sas_ha_struct *sas_ha) 953{ 954 unsigned long flags; 955 struct scsi_core *core = &sas_ha->core; 956 struct sas_task *task, *n; 957 958 kthread_stop(core->queue_thread); 959 960 if (!list_empty(&core->task_queue)) 961 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n", 962 SAS_ADDR(sas_ha->sas_addr)); 963 964 spin_lock_irqsave(&core->task_queue_lock, flags); 965 list_for_each_entry_safe(task, n, &core->task_queue, list) { 966 struct scsi_cmnd *cmd = task->uldd_task; 967 968 list_del_init(&task->list); 969 970 ASSIGN_SAS_TASK(cmd, NULL); 971 sas_free_task(task); 972 cmd->result = DID_ABORT << 16; 973 cmd->scsi_done(cmd); 974 } 975 spin_unlock_irqrestore(&core->task_queue_lock, flags); 976} 977 978/* 979 * Call the LLDD task abort routine directly. This function is intended for 980 * use by upper layers that need to tell the LLDD to abort a task. 981 */ 982int __sas_task_abort(struct sas_task *task) 983{ 984 struct sas_internal *si = 985 to_sas_internal(task->dev->port->ha->core.shost->transportt); 986 unsigned long flags; 987 int res; 988 989 spin_lock_irqsave(&task->task_state_lock, flags); 990 if (task->task_state_flags & SAS_TASK_STATE_ABORTED || 991 task->task_state_flags & SAS_TASK_STATE_DONE) { 992 spin_unlock_irqrestore(&task->task_state_lock, flags); 993 SAS_DPRINTK("%s: Task %p already finished.\n", __func__, 994 task); 995 return 0; 996 } 997 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 998 spin_unlock_irqrestore(&task->task_state_lock, flags); 999 1000 if (!si->dft->lldd_abort_task) 1001 return -ENODEV; 1002 1003 res = si->dft->lldd_abort_task(task); 1004 1005 spin_lock_irqsave(&task->task_state_lock, flags); 1006 if ((task->task_state_flags & SAS_TASK_STATE_DONE) || 1007 (res == TMF_RESP_FUNC_COMPLETE)) 1008 { 1009 spin_unlock_irqrestore(&task->task_state_lock, flags); 1010 task->task_done(task); 1011 return 0; 1012 } 1013 1014 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 1015 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 1016 spin_unlock_irqrestore(&task->task_state_lock, flags); 1017 1018 return -EAGAIN; 1019} 1020 1021/* 1022 * Tell an upper layer that it needs to initiate an abort for a given task. 1023 * This should only ever be called by an LLDD. 1024 */ 1025void sas_task_abort(struct sas_task *task) 1026{ 1027 struct scsi_cmnd *sc = task->uldd_task; 1028 1029 /* Escape for libsas internal commands */ 1030 if (!sc) { 1031 if (!del_timer(&task->timer)) 1032 return; 1033 task->timer.function(task->timer.data); 1034 return; 1035 } 1036 1037 if (dev_is_sata(task->dev)) { 1038 sas_ata_task_abort(task); 1039 return; 1040 } 1041 1042 scsi_req_abort_cmd(sc); 1043 scsi_schedule_eh(sc->device->host); 1044} 1045 1046int sas_slave_alloc(struct scsi_device *scsi_dev) 1047{ 1048 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 1049 1050 if (dev_is_sata(dev)) 1051 return ata_sas_port_init(dev->sata_dev.ap); 1052 1053 return 0; 1054} 1055 1056void sas_target_destroy(struct scsi_target *starget) 1057{ 1058 struct domain_device *found_dev = sas_find_target(starget); 1059 1060 if (!found_dev) 1061 return; 1062 1063 if (dev_is_sata(found_dev)) 1064 ata_sas_port_destroy(found_dev->sata_dev.ap); 1065 1066 return; 1067} 1068 1069static void sas_parse_addr(u8 *sas_addr, const char *p) 1070{ 1071 int i; 1072 for (i = 0; i < SAS_ADDR_SIZE; i++) { 1073 u8 h, l; 1074 if (!*p) 1075 break; 1076 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; 1077 p++; 1078 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; 1079 p++; 1080 sas_addr[i] = (h<<4) | l; 1081 } 1082} 1083 1084#define SAS_STRING_ADDR_SIZE 16 1085 1086int sas_request_addr(struct Scsi_Host *shost, u8 *addr) 1087{ 1088 int res; 1089 const struct firmware *fw; 1090 1091 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev); 1092 if (res) 1093 return res; 1094 1095 if (fw->size < SAS_STRING_ADDR_SIZE) { 1096 res = -ENODEV; 1097 goto out; 1098 } 1099 1100 sas_parse_addr(addr, fw->data); 1101 1102out: 1103 release_firmware(fw); 1104 return res; 1105} 1106EXPORT_SYMBOL_GPL(sas_request_addr); 1107 1108EXPORT_SYMBOL_GPL(sas_queuecommand); 1109EXPORT_SYMBOL_GPL(sas_target_alloc); 1110EXPORT_SYMBOL_GPL(sas_slave_configure); 1111EXPORT_SYMBOL_GPL(sas_slave_destroy); 1112EXPORT_SYMBOL_GPL(sas_change_queue_depth); 1113EXPORT_SYMBOL_GPL(sas_change_queue_type); 1114EXPORT_SYMBOL_GPL(sas_bios_param); 1115EXPORT_SYMBOL_GPL(__sas_task_abort); 1116EXPORT_SYMBOL_GPL(sas_task_abort); 1117EXPORT_SYMBOL_GPL(sas_phy_reset); 1118EXPORT_SYMBOL_GPL(sas_phy_enable); 1119EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler); 1120EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler); 1121EXPORT_SYMBOL_GPL(sas_slave_alloc); 1122EXPORT_SYMBOL_GPL(sas_target_destroy); 1123EXPORT_SYMBOL_GPL(sas_ioctl); 1124