sas_scsi_host.c revision 2a559f4ba443265b4c58925b48296f1cf81b49f9
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/* record final status and free the task */ 53static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task) 54{ 55 struct task_status_struct *ts = &task->task_status; 56 int hs = 0, stat = 0; 57 58 if (ts->resp == SAS_TASK_UNDELIVERED) { 59 /* transport error */ 60 hs = DID_NO_CONNECT; 61 } else { /* ts->resp == SAS_TASK_COMPLETE */ 62 /* task delivered, what happened afterwards? */ 63 switch (ts->stat) { 64 case SAS_DEV_NO_RESPONSE: 65 case SAS_INTERRUPTED: 66 case SAS_PHY_DOWN: 67 case SAS_NAK_R_ERR: 68 case SAS_OPEN_TO: 69 hs = DID_NO_CONNECT; 70 break; 71 case SAS_DATA_UNDERRUN: 72 scsi_set_resid(sc, ts->residual); 73 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow) 74 hs = DID_ERROR; 75 break; 76 case SAS_DATA_OVERRUN: 77 hs = DID_ERROR; 78 break; 79 case SAS_QUEUE_FULL: 80 hs = DID_SOFT_ERROR; /* retry */ 81 break; 82 case SAS_DEVICE_UNKNOWN: 83 hs = DID_BAD_TARGET; 84 break; 85 case SAS_SG_ERR: 86 hs = DID_PARITY; 87 break; 88 case SAS_OPEN_REJECT: 89 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY) 90 hs = DID_SOFT_ERROR; /* retry */ 91 else 92 hs = DID_ERROR; 93 break; 94 case SAS_PROTO_RESPONSE: 95 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP " 96 "task; please report this\n", 97 task->dev->port->ha->sas_ha_name); 98 break; 99 case SAS_ABORTED_TASK: 100 hs = DID_ABORT; 101 break; 102 case SAM_STAT_CHECK_CONDITION: 103 memcpy(sc->sense_buffer, ts->buf, 104 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size)); 105 stat = SAM_STAT_CHECK_CONDITION; 106 break; 107 default: 108 stat = ts->stat; 109 break; 110 } 111 } 112 113 sc->result = (hs << 16) | stat; 114 ASSIGN_SAS_TASK(sc, NULL); 115 list_del_init(&task->list); 116 sas_free_task(task); 117} 118 119static void sas_scsi_task_done(struct sas_task *task) 120{ 121 struct scsi_cmnd *sc = task->uldd_task; 122 struct domain_device *dev = task->dev; 123 struct sas_ha_struct *ha = dev->port->ha; 124 unsigned long flags; 125 126 spin_lock_irqsave(&dev->done_lock, flags); 127 if (test_bit(SAS_HA_FROZEN, &ha->state)) 128 task = NULL; 129 else 130 ASSIGN_SAS_TASK(sc, NULL); 131 spin_unlock_irqrestore(&dev->done_lock, flags); 132 133 if (unlikely(!task)) { 134 /* task will be completed by the error handler */ 135 SAS_DPRINTK("task done but aborted\n"); 136 return; 137 } 138 139 if (unlikely(!sc)) { 140 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n"); 141 list_del_init(&task->list); 142 sas_free_task(task); 143 return; 144 } 145 146 sas_end_task(sc, task); 147 sc->scsi_done(sc); 148} 149 150static struct sas_task *sas_create_task(struct scsi_cmnd *cmd, 151 struct domain_device *dev, 152 gfp_t gfp_flags) 153{ 154 struct sas_task *task = sas_alloc_task(gfp_flags); 155 struct scsi_lun lun; 156 157 if (!task) 158 return NULL; 159 160 task->uldd_task = cmd; 161 ASSIGN_SAS_TASK(cmd, task); 162 163 task->dev = dev; 164 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */ 165 166 task->ssp_task.retry_count = 1; 167 int_to_scsilun(cmd->device->lun, &lun); 168 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8); 169 task->ssp_task.task_attr = TASK_ATTR_SIMPLE; 170 memcpy(task->ssp_task.cdb, cmd->cmnd, 16); 171 172 task->scatter = scsi_sglist(cmd); 173 task->num_scatter = scsi_sg_count(cmd); 174 task->total_xfer_len = scsi_bufflen(cmd); 175 task->data_dir = cmd->sc_data_direction; 176 177 task->task_done = sas_scsi_task_done; 178 179 return task; 180} 181 182int sas_queue_up(struct sas_task *task) 183{ 184 struct sas_ha_struct *sas_ha = task->dev->port->ha; 185 struct scsi_core *core = &sas_ha->core; 186 unsigned long flags; 187 LIST_HEAD(list); 188 189 spin_lock_irqsave(&core->task_queue_lock, flags); 190 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) { 191 spin_unlock_irqrestore(&core->task_queue_lock, flags); 192 return -SAS_QUEUE_FULL; 193 } 194 list_add_tail(&task->list, &core->task_queue); 195 core->task_queue_size += 1; 196 spin_unlock_irqrestore(&core->task_queue_lock, flags); 197 wake_up_process(core->queue_thread); 198 199 return 0; 200} 201 202int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) 203{ 204 struct sas_internal *i = to_sas_internal(host->transportt); 205 struct domain_device *dev = cmd_to_domain_dev(cmd); 206 struct sas_ha_struct *sas_ha = dev->port->ha; 207 struct sas_task *task; 208 int res = 0; 209 210 /* If the device fell off, no sense in issuing commands */ 211 if (test_bit(SAS_DEV_GONE, &dev->state)) { 212 cmd->result = DID_BAD_TARGET << 16; 213 goto out_done; 214 } 215 216 if (dev_is_sata(dev)) { 217 spin_lock_irq(dev->sata_dev.ap->lock); 218 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap); 219 spin_unlock_irq(dev->sata_dev.ap->lock); 220 return res; 221 } 222 223 task = sas_create_task(cmd, dev, GFP_ATOMIC); 224 if (!task) 225 return SCSI_MLQUEUE_HOST_BUSY; 226 227 /* Queue up, Direct Mode or Task Collector Mode. */ 228 if (sas_ha->lldd_max_execute_num < 2) 229 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); 230 else 231 res = sas_queue_up(task); 232 233 if (res) 234 goto out_free_task; 235 return 0; 236 237out_free_task: 238 SAS_DPRINTK("lldd_execute_task returned: %d\n", res); 239 ASSIGN_SAS_TASK(cmd, NULL); 240 sas_free_task(task); 241 if (res == -SAS_QUEUE_FULL) 242 cmd->result = DID_SOFT_ERROR << 16; /* retry */ 243 else 244 cmd->result = DID_ERROR << 16; 245out_done: 246 cmd->scsi_done(cmd); 247 return 0; 248} 249 250static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) 251{ 252 struct sas_task *task = TO_SAS_TASK(cmd); 253 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host); 254 255 /* At this point, we only get called following an actual abort 256 * of the task, so we should be guaranteed not to be racing with 257 * any completions from the LLD. Task is freed after this. 258 */ 259 sas_end_task(cmd, task); 260 261 /* now finish the command and move it on to the error 262 * handler done list, this also takes it off the 263 * error handler pending list. 264 */ 265 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q); 266} 267 268static void sas_eh_defer_cmd(struct scsi_cmnd *cmd) 269{ 270 struct sas_task *task = TO_SAS_TASK(cmd); 271 struct domain_device *dev = task->dev; 272 struct sas_ha_struct *ha = dev->port->ha; 273 274 if (!dev_is_sata(dev)) { 275 sas_eh_finish_cmd(cmd); 276 return; 277 } 278 279 /* report the timeout to libata */ 280 sas_end_task(cmd, task); 281 list_move_tail(&cmd->eh_entry, &ha->eh_ata_q); 282} 283 284static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd) 285{ 286 struct scsi_cmnd *cmd, *n; 287 288 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 289 if (cmd->device->sdev_target == my_cmd->device->sdev_target && 290 cmd->device->lun == my_cmd->device->lun) 291 sas_eh_defer_cmd(cmd); 292 } 293} 294 295static void sas_scsi_clear_queue_I_T(struct list_head *error_q, 296 struct domain_device *dev) 297{ 298 struct scsi_cmnd *cmd, *n; 299 300 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 301 struct domain_device *x = cmd_to_domain_dev(cmd); 302 303 if (x == dev) 304 sas_eh_finish_cmd(cmd); 305 } 306} 307 308static void sas_scsi_clear_queue_port(struct list_head *error_q, 309 struct asd_sas_port *port) 310{ 311 struct scsi_cmnd *cmd, *n; 312 313 list_for_each_entry_safe(cmd, n, error_q, eh_entry) { 314 struct domain_device *dev = cmd_to_domain_dev(cmd); 315 struct asd_sas_port *x = dev->port; 316 317 if (x == port) 318 sas_eh_finish_cmd(cmd); 319 } 320} 321 322enum task_disposition { 323 TASK_IS_DONE, 324 TASK_IS_ABORTED, 325 TASK_IS_AT_LU, 326 TASK_IS_NOT_AT_HA, 327 TASK_IS_NOT_AT_LU, 328 TASK_ABORT_FAILED, 329}; 330 331static enum task_disposition sas_scsi_find_task(struct sas_task *task) 332{ 333 struct sas_ha_struct *ha = task->dev->port->ha; 334 unsigned long flags; 335 int i, res; 336 struct sas_internal *si = 337 to_sas_internal(task->dev->port->ha->core.shost->transportt); 338 339 if (ha->lldd_max_execute_num > 1) { 340 struct scsi_core *core = &ha->core; 341 struct sas_task *t, *n; 342 343 mutex_lock(&core->task_queue_flush); 344 spin_lock_irqsave(&core->task_queue_lock, flags); 345 list_for_each_entry_safe(t, n, &core->task_queue, list) 346 if (task == t) { 347 list_del_init(&t->list); 348 break; 349 } 350 spin_unlock_irqrestore(&core->task_queue_lock, flags); 351 mutex_unlock(&core->task_queue_flush); 352 353 if (task == t) 354 return TASK_IS_NOT_AT_HA; 355 } 356 357 for (i = 0; i < 5; i++) { 358 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task); 359 res = si->dft->lldd_abort_task(task); 360 361 spin_lock_irqsave(&task->task_state_lock, flags); 362 if (task->task_state_flags & SAS_TASK_STATE_DONE) { 363 spin_unlock_irqrestore(&task->task_state_lock, flags); 364 SAS_DPRINTK("%s: task 0x%p is done\n", __func__, 365 task); 366 return TASK_IS_DONE; 367 } 368 spin_unlock_irqrestore(&task->task_state_lock, flags); 369 370 if (res == TMF_RESP_FUNC_COMPLETE) { 371 SAS_DPRINTK("%s: task 0x%p is aborted\n", 372 __func__, task); 373 return TASK_IS_ABORTED; 374 } else if (si->dft->lldd_query_task) { 375 SAS_DPRINTK("%s: querying task 0x%p\n", 376 __func__, task); 377 res = si->dft->lldd_query_task(task); 378 switch (res) { 379 case TMF_RESP_FUNC_SUCC: 380 SAS_DPRINTK("%s: task 0x%p at LU\n", 381 __func__, task); 382 return TASK_IS_AT_LU; 383 case TMF_RESP_FUNC_COMPLETE: 384 SAS_DPRINTK("%s: task 0x%p not at LU\n", 385 __func__, task); 386 return TASK_IS_NOT_AT_LU; 387 case TMF_RESP_FUNC_FAILED: 388 SAS_DPRINTK("%s: task 0x%p failed to abort\n", 389 __func__, task); 390 return TASK_ABORT_FAILED; 391 } 392 393 } 394 } 395 return res; 396} 397 398static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd) 399{ 400 int res = TMF_RESP_FUNC_FAILED; 401 struct scsi_lun lun; 402 struct sas_internal *i = 403 to_sas_internal(dev->port->ha->core.shost->transportt); 404 405 int_to_scsilun(cmd->device->lun, &lun); 406 407 SAS_DPRINTK("eh: device %llx LUN %x has the task\n", 408 SAS_ADDR(dev->sas_addr), 409 cmd->device->lun); 410 411 if (i->dft->lldd_abort_task_set) 412 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun); 413 414 if (res == TMF_RESP_FUNC_FAILED) { 415 if (i->dft->lldd_clear_task_set) 416 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun); 417 } 418 419 if (res == TMF_RESP_FUNC_FAILED) { 420 if (i->dft->lldd_lu_reset) 421 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); 422 } 423 424 return res; 425} 426 427static int sas_recover_I_T(struct domain_device *dev) 428{ 429 int res = TMF_RESP_FUNC_FAILED; 430 struct sas_internal *i = 431 to_sas_internal(dev->port->ha->core.shost->transportt); 432 433 SAS_DPRINTK("I_T nexus reset for dev %016llx\n", 434 SAS_ADDR(dev->sas_addr)); 435 436 if (i->dft->lldd_I_T_nexus_reset) 437 res = i->dft->lldd_I_T_nexus_reset(dev); 438 439 return res; 440} 441 442/* Find the sas_phy that's attached to this device */ 443struct sas_phy *sas_find_local_phy(struct domain_device *dev) 444{ 445 struct domain_device *pdev = dev->parent; 446 struct ex_phy *exphy = NULL; 447 int i; 448 449 /* Directly attached device */ 450 if (!pdev) 451 return dev->port->phy; 452 453 /* Otherwise look in the expander */ 454 for (i = 0; i < pdev->ex_dev.num_phys; i++) 455 if (!memcmp(dev->sas_addr, 456 pdev->ex_dev.ex_phy[i].attached_sas_addr, 457 SAS_ADDR_SIZE)) { 458 exphy = &pdev->ex_dev.ex_phy[i]; 459 break; 460 } 461 462 BUG_ON(!exphy); 463 return exphy->phy; 464} 465EXPORT_SYMBOL_GPL(sas_find_local_phy); 466 467/* Attempt to send a LUN reset message to a device */ 468int sas_eh_device_reset_handler(struct scsi_cmnd *cmd) 469{ 470 struct domain_device *dev = cmd_to_domain_dev(cmd); 471 struct sas_internal *i = 472 to_sas_internal(dev->port->ha->core.shost->transportt); 473 struct scsi_lun lun; 474 int res; 475 476 int_to_scsilun(cmd->device->lun, &lun); 477 478 if (!i->dft->lldd_lu_reset) 479 return FAILED; 480 481 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); 482 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) 483 return SUCCESS; 484 485 return FAILED; 486} 487 488/* Attempt to send a phy (bus) reset */ 489int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd) 490{ 491 struct domain_device *dev = cmd_to_domain_dev(cmd); 492 struct sas_phy *phy = sas_find_local_phy(dev); 493 int res; 494 495 res = sas_phy_reset(phy, 1); 496 if (res) 497 SAS_DPRINTK("Bus reset of %s failed 0x%x\n", 498 kobject_name(&phy->dev.kobj), 499 res); 500 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) 501 return SUCCESS; 502 503 return FAILED; 504} 505 506/* Try to reset a device */ 507static int try_to_reset_cmd_device(struct scsi_cmnd *cmd) 508{ 509 int res; 510 struct Scsi_Host *shost = cmd->device->host; 511 512 if (!shost->hostt->eh_device_reset_handler) 513 goto try_bus_reset; 514 515 res = shost->hostt->eh_device_reset_handler(cmd); 516 if (res == SUCCESS) 517 return res; 518 519try_bus_reset: 520 if (shost->hostt->eh_bus_reset_handler) 521 return shost->hostt->eh_bus_reset_handler(cmd); 522 523 return FAILED; 524} 525 526static int sas_eh_handle_sas_errors(struct Scsi_Host *shost, 527 struct list_head *work_q) 528{ 529 struct scsi_cmnd *cmd, *n; 530 enum task_disposition res = TASK_IS_DONE; 531 int tmf_resp, need_reset; 532 struct sas_internal *i = to_sas_internal(shost->transportt); 533 unsigned long flags; 534 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 535 536Again: 537 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 538 struct domain_device *dev = cmd_to_domain_dev(cmd); 539 struct sas_task *task; 540 541 spin_lock_irqsave(&dev->done_lock, flags); 542 /* by this point the lldd has either observed 543 * SAS_HA_FROZEN and is leaving the task alone, or has 544 * won the race with eh and decided to complete it 545 */ 546 task = TO_SAS_TASK(cmd); 547 spin_unlock_irqrestore(&dev->done_lock, flags); 548 549 if (!task) 550 continue; 551 552 list_del_init(&cmd->eh_entry); 553 554 spin_lock_irqsave(&task->task_state_lock, flags); 555 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET; 556 spin_unlock_irqrestore(&task->task_state_lock, flags); 557 558 if (need_reset) { 559 SAS_DPRINTK("%s: task 0x%p requests reset\n", 560 __func__, task); 561 goto reset; 562 } 563 564 SAS_DPRINTK("trying to find task 0x%p\n", task); 565 res = sas_scsi_find_task(task); 566 567 cmd->eh_eflags = 0; 568 569 switch (res) { 570 case TASK_IS_NOT_AT_HA: 571 SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n", 572 __func__, task, 573 cmd->retries ? "retry" : "aborted"); 574 if (cmd->retries) 575 cmd->retries--; 576 sas_eh_finish_cmd(cmd); 577 continue; 578 case TASK_IS_DONE: 579 SAS_DPRINTK("%s: task 0x%p is done\n", __func__, 580 task); 581 sas_eh_defer_cmd(cmd); 582 continue; 583 case TASK_IS_ABORTED: 584 SAS_DPRINTK("%s: task 0x%p is aborted\n", 585 __func__, task); 586 sas_eh_defer_cmd(cmd); 587 continue; 588 case TASK_IS_AT_LU: 589 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task); 590 reset: 591 tmf_resp = sas_recover_lu(task->dev, cmd); 592 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { 593 SAS_DPRINTK("dev %016llx LU %x is " 594 "recovered\n", 595 SAS_ADDR(task->dev), 596 cmd->device->lun); 597 sas_eh_defer_cmd(cmd); 598 sas_scsi_clear_queue_lu(work_q, cmd); 599 goto Again; 600 } 601 /* fallthrough */ 602 case TASK_IS_NOT_AT_LU: 603 case TASK_ABORT_FAILED: 604 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n", 605 task); 606 tmf_resp = sas_recover_I_T(task->dev); 607 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { 608 struct domain_device *dev = task->dev; 609 SAS_DPRINTK("I_T %016llx recovered\n", 610 SAS_ADDR(task->dev->sas_addr)); 611 sas_eh_finish_cmd(cmd); 612 sas_scsi_clear_queue_I_T(work_q, dev); 613 goto Again; 614 } 615 /* Hammer time :-) */ 616 try_to_reset_cmd_device(cmd); 617 if (i->dft->lldd_clear_nexus_port) { 618 struct asd_sas_port *port = task->dev->port; 619 SAS_DPRINTK("clearing nexus for port:%d\n", 620 port->id); 621 res = i->dft->lldd_clear_nexus_port(port); 622 if (res == TMF_RESP_FUNC_COMPLETE) { 623 SAS_DPRINTK("clear nexus port:%d " 624 "succeeded\n", port->id); 625 sas_eh_finish_cmd(cmd); 626 sas_scsi_clear_queue_port(work_q, 627 port); 628 goto Again; 629 } 630 } 631 if (i->dft->lldd_clear_nexus_ha) { 632 SAS_DPRINTK("clear nexus ha\n"); 633 res = i->dft->lldd_clear_nexus_ha(ha); 634 if (res == TMF_RESP_FUNC_COMPLETE) { 635 SAS_DPRINTK("clear nexus ha " 636 "succeeded\n"); 637 sas_eh_finish_cmd(cmd); 638 goto clear_q; 639 } 640 } 641 /* If we are here -- this means that no amount 642 * of effort could recover from errors. Quite 643 * possibly the HA just disappeared. 644 */ 645 SAS_DPRINTK("error from device %llx, LUN %x " 646 "couldn't be recovered in any way\n", 647 SAS_ADDR(task->dev->sas_addr), 648 cmd->device->lun); 649 650 sas_eh_finish_cmd(cmd); 651 goto clear_q; 652 } 653 } 654 list_splice_tail_init(&ha->eh_ata_q, work_q); 655 return list_empty(work_q); 656clear_q: 657 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__); 658 list_for_each_entry_safe(cmd, n, work_q, eh_entry) 659 sas_eh_finish_cmd(cmd); 660 661 list_splice_tail_init(&ha->eh_ata_q, work_q); 662 return list_empty(work_q); 663} 664 665void sas_scsi_recover_host(struct Scsi_Host *shost) 666{ 667 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 668 unsigned long flags; 669 LIST_HEAD(eh_work_q); 670 671 spin_lock_irqsave(shost->host_lock, flags); 672 list_splice_init(&shost->eh_cmd_q, &eh_work_q); 673 shost->host_eh_scheduled = 0; 674 spin_unlock_irqrestore(shost->host_lock, flags); 675 676 SAS_DPRINTK("Enter %s\n", __func__); 677 /* 678 * Deal with commands that still have SAS tasks (i.e. they didn't 679 * complete via the normal sas_task completion mechanism) 680 */ 681 set_bit(SAS_HA_FROZEN, &ha->state); 682 if (sas_eh_handle_sas_errors(shost, &eh_work_q)) 683 goto out; 684 685 /* 686 * Now deal with SCSI commands that completed ok but have a an error 687 * code (and hopefully sense data) attached. This is roughly what 688 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any 689 * command we see here has no sas_task and is thus unknown to the HA. 690 */ 691 if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q)) 692 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q)) 693 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q); 694 695out: 696 clear_bit(SAS_HA_FROZEN, &ha->state); 697 if (ha->lldd_max_execute_num > 1) 698 wake_up_process(ha->core.queue_thread); 699 700 /* now link into libata eh --- if we have any ata devices */ 701 sas_ata_strategy_handler(shost); 702 703 scsi_eh_flush_done_q(&ha->eh_done_q); 704 705 SAS_DPRINTK("--- Exit %s\n", __func__); 706 return; 707} 708 709enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd) 710{ 711 scmd_printk(KERN_DEBUG, cmd, "command %p timed out\n", cmd); 712 713 return BLK_EH_NOT_HANDLED; 714} 715 716int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) 717{ 718 struct domain_device *dev = sdev_to_domain_dev(sdev); 719 720 if (dev_is_sata(dev)) 721 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg); 722 723 return -EINVAL; 724} 725 726struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy) 727{ 728 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent); 729 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 730 struct domain_device *found_dev = NULL; 731 int i; 732 unsigned long flags; 733 734 spin_lock_irqsave(&ha->phy_port_lock, flags); 735 for (i = 0; i < ha->num_phys; i++) { 736 struct asd_sas_port *port = ha->sas_port[i]; 737 struct domain_device *dev; 738 739 spin_lock(&port->dev_list_lock); 740 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 741 if (rphy == dev->rphy) { 742 found_dev = dev; 743 spin_unlock(&port->dev_list_lock); 744 goto found; 745 } 746 } 747 spin_unlock(&port->dev_list_lock); 748 } 749 found: 750 spin_unlock_irqrestore(&ha->phy_port_lock, flags); 751 752 return found_dev; 753} 754 755int sas_target_alloc(struct scsi_target *starget) 756{ 757 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent); 758 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy); 759 int res; 760 761 if (!found_dev) 762 return -ENODEV; 763 764 if (dev_is_sata(found_dev)) { 765 res = sas_ata_init_host_and_port(found_dev, starget); 766 if (res) 767 return res; 768 } 769 770 kref_get(&found_dev->kref); 771 starget->hostdata = found_dev; 772 return 0; 773} 774 775#define SAS_DEF_QD 256 776 777int sas_slave_configure(struct scsi_device *scsi_dev) 778{ 779 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 780 struct sas_ha_struct *sas_ha; 781 782 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE); 783 784 if (dev_is_sata(dev)) { 785 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap); 786 return 0; 787 } 788 789 sas_ha = dev->port->ha; 790 791 sas_read_port_mode_page(scsi_dev); 792 793 if (scsi_dev->tagged_supported) { 794 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG); 795 scsi_activate_tcq(scsi_dev, SAS_DEF_QD); 796 } else { 797 SAS_DPRINTK("device %llx, LUN %x doesn't support " 798 "TCQ\n", SAS_ADDR(dev->sas_addr), 799 scsi_dev->lun); 800 scsi_dev->tagged_supported = 0; 801 scsi_set_tag_type(scsi_dev, 0); 802 scsi_deactivate_tcq(scsi_dev, 1); 803 } 804 805 scsi_dev->allow_restart = 1; 806 807 return 0; 808} 809 810int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason) 811{ 812 struct domain_device *dev = sdev_to_domain_dev(sdev); 813 814 if (dev_is_sata(dev)) 815 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth, 816 reason); 817 818 switch (reason) { 819 case SCSI_QDEPTH_DEFAULT: 820 case SCSI_QDEPTH_RAMP_UP: 821 if (!sdev->tagged_supported) 822 depth = 1; 823 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 824 break; 825 case SCSI_QDEPTH_QFULL: 826 scsi_track_queue_full(sdev, depth); 827 break; 828 default: 829 return -EOPNOTSUPP; 830 } 831 832 return depth; 833} 834 835int sas_change_queue_type(struct scsi_device *scsi_dev, int qt) 836{ 837 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 838 839 if (dev_is_sata(dev)) 840 return -EINVAL; 841 842 if (!scsi_dev->tagged_supported) 843 return 0; 844 845 scsi_deactivate_tcq(scsi_dev, 1); 846 847 scsi_set_tag_type(scsi_dev, qt); 848 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); 849 850 return qt; 851} 852 853int sas_bios_param(struct scsi_device *scsi_dev, 854 struct block_device *bdev, 855 sector_t capacity, int *hsc) 856{ 857 hsc[0] = 255; 858 hsc[1] = 63; 859 sector_div(capacity, 255*63); 860 hsc[2] = capacity; 861 862 return 0; 863} 864 865/* ---------- Task Collector Thread implementation ---------- */ 866 867static void sas_queue(struct sas_ha_struct *sas_ha) 868{ 869 struct scsi_core *core = &sas_ha->core; 870 unsigned long flags; 871 LIST_HEAD(q); 872 int can_queue; 873 int res; 874 struct sas_internal *i = to_sas_internal(core->shost->transportt); 875 876 mutex_lock(&core->task_queue_flush); 877 spin_lock_irqsave(&core->task_queue_lock, flags); 878 while (!kthread_should_stop() && 879 !list_empty(&core->task_queue) && 880 !test_bit(SAS_HA_FROZEN, &sas_ha->state)) { 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 mutex_unlock(&core->task_queue_flush); 917} 918 919/** 920 * sas_queue_thread -- The Task Collector thread 921 * @_sas_ha: pointer to struct sas_ha 922 */ 923static int sas_queue_thread(void *_sas_ha) 924{ 925 struct sas_ha_struct *sas_ha = _sas_ha; 926 927 while (1) { 928 set_current_state(TASK_INTERRUPTIBLE); 929 schedule(); 930 sas_queue(sas_ha); 931 if (kthread_should_stop()) 932 break; 933 } 934 935 return 0; 936} 937 938int sas_init_queue(struct sas_ha_struct *sas_ha) 939{ 940 struct scsi_core *core = &sas_ha->core; 941 942 spin_lock_init(&core->task_queue_lock); 943 mutex_init(&core->task_queue_flush); 944 core->task_queue_size = 0; 945 INIT_LIST_HEAD(&core->task_queue); 946 947 core->queue_thread = kthread_run(sas_queue_thread, sas_ha, 948 "sas_queue_%d", core->shost->host_no); 949 if (IS_ERR(core->queue_thread)) 950 return PTR_ERR(core->queue_thread); 951 return 0; 952} 953 954void sas_shutdown_queue(struct sas_ha_struct *sas_ha) 955{ 956 unsigned long flags; 957 struct scsi_core *core = &sas_ha->core; 958 struct sas_task *task, *n; 959 960 kthread_stop(core->queue_thread); 961 962 if (!list_empty(&core->task_queue)) 963 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n", 964 SAS_ADDR(sas_ha->sas_addr)); 965 966 spin_lock_irqsave(&core->task_queue_lock, flags); 967 list_for_each_entry_safe(task, n, &core->task_queue, list) { 968 struct scsi_cmnd *cmd = task->uldd_task; 969 970 list_del_init(&task->list); 971 972 ASSIGN_SAS_TASK(cmd, NULL); 973 sas_free_task(task); 974 cmd->result = DID_ABORT << 16; 975 cmd->scsi_done(cmd); 976 } 977 spin_unlock_irqrestore(&core->task_queue_lock, flags); 978} 979 980/* 981 * Tell an upper layer that it needs to initiate an abort for a given task. 982 * This should only ever be called by an LLDD. 983 */ 984void sas_task_abort(struct sas_task *task) 985{ 986 struct scsi_cmnd *sc = task->uldd_task; 987 988 /* Escape for libsas internal commands */ 989 if (!sc) { 990 if (!del_timer(&task->timer)) 991 return; 992 task->timer.function(task->timer.data); 993 return; 994 } 995 996 if (dev_is_sata(task->dev)) { 997 sas_ata_task_abort(task); 998 } else { 999 struct request_queue *q = sc->device->request_queue; 1000 unsigned long flags; 1001 1002 spin_lock_irqsave(q->queue_lock, flags); 1003 blk_abort_request(sc->request); 1004 spin_unlock_irqrestore(q->queue_lock, flags); 1005 scsi_schedule_eh(sc->device->host); 1006 } 1007} 1008 1009int sas_slave_alloc(struct scsi_device *scsi_dev) 1010{ 1011 struct domain_device *dev = sdev_to_domain_dev(scsi_dev); 1012 1013 if (dev_is_sata(dev)) 1014 return ata_sas_port_init(dev->sata_dev.ap); 1015 1016 return 0; 1017} 1018 1019void sas_target_destroy(struct scsi_target *starget) 1020{ 1021 struct domain_device *found_dev = starget->hostdata; 1022 1023 if (!found_dev) 1024 return; 1025 1026 if (dev_is_sata(found_dev)) 1027 ata_sas_port_destroy(found_dev->sata_dev.ap); 1028 1029 starget->hostdata = NULL; 1030 sas_put_device(found_dev); 1031} 1032 1033static void sas_parse_addr(u8 *sas_addr, const char *p) 1034{ 1035 int i; 1036 for (i = 0; i < SAS_ADDR_SIZE; i++) { 1037 u8 h, l; 1038 if (!*p) 1039 break; 1040 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; 1041 p++; 1042 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; 1043 p++; 1044 sas_addr[i] = (h<<4) | l; 1045 } 1046} 1047 1048#define SAS_STRING_ADDR_SIZE 16 1049 1050int sas_request_addr(struct Scsi_Host *shost, u8 *addr) 1051{ 1052 int res; 1053 const struct firmware *fw; 1054 1055 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev); 1056 if (res) 1057 return res; 1058 1059 if (fw->size < SAS_STRING_ADDR_SIZE) { 1060 res = -ENODEV; 1061 goto out; 1062 } 1063 1064 sas_parse_addr(addr, fw->data); 1065 1066out: 1067 release_firmware(fw); 1068 return res; 1069} 1070EXPORT_SYMBOL_GPL(sas_request_addr); 1071 1072EXPORT_SYMBOL_GPL(sas_queuecommand); 1073EXPORT_SYMBOL_GPL(sas_target_alloc); 1074EXPORT_SYMBOL_GPL(sas_slave_configure); 1075EXPORT_SYMBOL_GPL(sas_change_queue_depth); 1076EXPORT_SYMBOL_GPL(sas_change_queue_type); 1077EXPORT_SYMBOL_GPL(sas_bios_param); 1078EXPORT_SYMBOL_GPL(sas_task_abort); 1079EXPORT_SYMBOL_GPL(sas_phy_reset); 1080EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler); 1081EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler); 1082EXPORT_SYMBOL_GPL(sas_slave_alloc); 1083EXPORT_SYMBOL_GPL(sas_target_destroy); 1084EXPORT_SYMBOL_GPL(sas_ioctl); 1085