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1/*
2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
4 *
5 * GPL LICENSE SUMMARY
6 *
7 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * BSD LICENSE
25 *
26 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
27 * All rights reserved.
28 *
29 * Redistribution and use in source and binary forms, with or without
30 * modification, are permitted provided that the following conditions
31 * are met:
32 *
33 * * Redistributions of source code must retain the above copyright
34 * notice, this list of conditions and the following disclaimer.
35 * * Redistributions in binary form must reproduce the above copyright
36 * notice, this list of conditions and the following disclaimer in
37 * the documentation and/or other materials provided with the
38 * distribution.
39 * * Neither the name of Intel Corporation nor the names of its
40 * contributors may be used to endorse or promote products derived
41 * from this software without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 */
55
56#include <linux/completion.h>
57#include <linux/irqflags.h>
58#include "sas.h"
59#include <scsi/libsas.h>
60#include "remote_device.h"
61#include "remote_node_context.h"
62#include "isci.h"
63#include "request.h"
64#include "task.h"
65#include "host.h"
66
67/**
68* isci_task_refuse() - complete the request to the upper layer driver in
69* the case where an I/O needs to be completed back in the submit path.
70* @ihost: host on which the the request was queued
71* @task: request to complete
72* @response: response code for the completed task.
73* @status: status code for the completed task.
74*
75*/
76static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
77 enum service_response response,
78 enum exec_status status)
79
80{
81 unsigned long flags;
82
83 /* Normal notification (task_done) */
84 dev_dbg(&ihost->pdev->dev, "%s: task = %p, response=%d, status=%d\n",
85 __func__, task, response, status);
86
87 spin_lock_irqsave(&task->task_state_lock, flags);
88
89 task->task_status.resp = response;
90 task->task_status.stat = status;
91
92 /* Normal notification (task_done) */
93 task->task_state_flags |= SAS_TASK_STATE_DONE;
94 task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
95 task->lldd_task = NULL;
96 spin_unlock_irqrestore(&task->task_state_lock, flags);
97
98 task->task_done(task);
99}
100
101#define for_each_sas_task(num, task) \
102 for (; num > 0; num--,\
103 task = list_entry(task->list.next, struct sas_task, list))
104
105
106static inline int isci_device_io_ready(struct isci_remote_device *idev,
107 struct sas_task *task)
108{
109 return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
110 (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
111 isci_task_is_ncq_recovery(task))
112 : 0;
113}
114/**
115 * isci_task_execute_task() - This function is one of the SAS Domain Template
116 * functions. This function is called by libsas to send a task down to
117 * hardware.
118 * @task: This parameter specifies the SAS task to send.
119 * @gfp_flags: This parameter specifies the context of this call.
120 *
121 * status, zero indicates success.
122 */
123int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
124{
125 struct isci_host *ihost = dev_to_ihost(task->dev);
126 struct isci_remote_device *idev;
127 unsigned long flags;
128 enum sci_status status = SCI_FAILURE;
129 bool io_ready;
130 u16 tag;
131
132 spin_lock_irqsave(&ihost->scic_lock, flags);
133 idev = isci_lookup_device(task->dev);
134 io_ready = isci_device_io_ready(idev, task);
135 tag = isci_alloc_tag(ihost);
136 spin_unlock_irqrestore(&ihost->scic_lock, flags);
137
138 dev_dbg(&ihost->pdev->dev,
139 "task: %p, dev: %p idev: %p:%#lx cmd = %p\n",
140 task, task->dev, idev, idev ? idev->flags : 0,
141 task->uldd_task);
142
143 if (!idev) {
144 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
145 SAS_DEVICE_UNKNOWN);
146 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
147 /* Indicate QUEUE_FULL so that the scsi midlayer
148 * retries.
149 */
150 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
151 SAS_QUEUE_FULL);
152 } else {
153 /* There is a device and it's ready for I/O. */
154 spin_lock_irqsave(&task->task_state_lock, flags);
155
156 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
157 /* The I/O was aborted. */
158 spin_unlock_irqrestore(&task->task_state_lock, flags);
159
160 isci_task_refuse(ihost, task,
161 SAS_TASK_UNDELIVERED,
162 SAS_SAM_STAT_TASK_ABORTED);
163 } else {
164 struct isci_request *ireq;
165
166 /* do common allocation and init of request object. */
167 ireq = isci_io_request_from_tag(ihost, task, tag);
168 spin_unlock_irqrestore(&task->task_state_lock, flags);
169
170 /* build and send the request. */
171 /* do common allocation and init of request object. */
172 status = isci_request_execute(ihost, idev, task, ireq);
173
174 if (status != SCI_SUCCESS) {
175 if (test_bit(IDEV_GONE, &idev->flags)) {
176 /* Indicate that the device
177 * is gone.
178 */
179 isci_task_refuse(ihost, task,
180 SAS_TASK_UNDELIVERED,
181 SAS_DEVICE_UNKNOWN);
182 } else {
183 /* Indicate QUEUE_FULL so that
184 * the scsi midlayer retries.
185 * If the request failed for
186 * remote device reasons, it
187 * gets returned as
188 * SAS_TASK_UNDELIVERED next
189 * time through.
190 */
191 isci_task_refuse(ihost, task,
192 SAS_TASK_COMPLETE,
193 SAS_QUEUE_FULL);
194 }
195 }
196 }
197 }
198
199 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
200 spin_lock_irqsave(&ihost->scic_lock, flags);
201 /* command never hit the device, so just free
202 * the tci and skip the sequence increment
203 */
204 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
205 spin_unlock_irqrestore(&ihost->scic_lock, flags);
206 }
207
208 isci_put_device(idev);
209 return 0;
210}
211
212static struct isci_request *isci_task_request_build(struct isci_host *ihost,
213 struct isci_remote_device *idev,
214 u16 tag, struct isci_tmf *isci_tmf)
215{
216 enum sci_status status = SCI_FAILURE;
217 struct isci_request *ireq = NULL;
218 struct domain_device *dev;
219
220 dev_dbg(&ihost->pdev->dev,
221 "%s: isci_tmf = %p\n", __func__, isci_tmf);
222
223 dev = idev->domain_dev;
224
225 /* do common allocation and init of request object. */
226 ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
227 if (!ireq)
228 return NULL;
229
230 /* let the core do it's construct. */
231 status = sci_task_request_construct(ihost, idev, tag,
232 ireq);
233
234 if (status != SCI_SUCCESS) {
235 dev_warn(&ihost->pdev->dev,
236 "%s: sci_task_request_construct failed - "
237 "status = 0x%x\n",
238 __func__,
239 status);
240 return NULL;
241 }
242
243 /* XXX convert to get this from task->tproto like other drivers */
244 if (dev->dev_type == SAS_END_DEVICE) {
245 isci_tmf->proto = SAS_PROTOCOL_SSP;
246 sci_task_request_construct_ssp(ireq);
247 }
248
249 return ireq;
250}
251
252static int isci_task_execute_tmf(struct isci_host *ihost,
253 struct isci_remote_device *idev,
254 struct isci_tmf *tmf, unsigned long timeout_ms)
255{
256 DECLARE_COMPLETION_ONSTACK(completion);
257 enum sci_status status = SCI_FAILURE;
258 struct isci_request *ireq;
259 int ret = TMF_RESP_FUNC_FAILED;
260 unsigned long flags;
261 unsigned long timeleft;
262 u16 tag;
263
264 spin_lock_irqsave(&ihost->scic_lock, flags);
265 tag = isci_alloc_tag(ihost);
266 spin_unlock_irqrestore(&ihost->scic_lock, flags);
267
268 if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
269 return ret;
270
271 /* sanity check, return TMF_RESP_FUNC_FAILED
272 * if the device is not there and ready.
273 */
274 if (!idev ||
275 (!test_bit(IDEV_IO_READY, &idev->flags) &&
276 !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
277 dev_dbg(&ihost->pdev->dev,
278 "%s: idev = %p not ready (%#lx)\n",
279 __func__,
280 idev, idev ? idev->flags : 0);
281 goto err_tci;
282 } else
283 dev_dbg(&ihost->pdev->dev,
284 "%s: idev = %p\n",
285 __func__, idev);
286
287 /* Assign the pointer to the TMF's completion kernel wait structure. */
288 tmf->complete = &completion;
289 tmf->status = SCI_FAILURE_TIMEOUT;
290
291 ireq = isci_task_request_build(ihost, idev, tag, tmf);
292 if (!ireq)
293 goto err_tci;
294
295 spin_lock_irqsave(&ihost->scic_lock, flags);
296
297 /* start the TMF io. */
298 status = sci_controller_start_task(ihost, idev, ireq);
299
300 if (status != SCI_SUCCESS) {
301 dev_dbg(&ihost->pdev->dev,
302 "%s: start_io failed - status = 0x%x, request = %p\n",
303 __func__,
304 status,
305 ireq);
306 spin_unlock_irqrestore(&ihost->scic_lock, flags);
307 goto err_tci;
308 }
309 spin_unlock_irqrestore(&ihost->scic_lock, flags);
310
311 /* The RNC must be unsuspended before the TMF can get a response. */
312 isci_remote_device_resume_from_abort(ihost, idev);
313
314 /* Wait for the TMF to complete, or a timeout. */
315 timeleft = wait_for_completion_timeout(&completion,
316 msecs_to_jiffies(timeout_ms));
317
318 if (timeleft == 0) {
319 /* The TMF did not complete - this could be because
320 * of an unplug. Terminate the TMF request now.
321 */
322 isci_remote_device_suspend_terminate(ihost, idev, ireq);
323 }
324
325 isci_print_tmf(ihost, tmf);
326
327 if (tmf->status == SCI_SUCCESS)
328 ret = TMF_RESP_FUNC_COMPLETE;
329 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
330 dev_dbg(&ihost->pdev->dev,
331 "%s: tmf.status == "
332 "SCI_FAILURE_IO_RESPONSE_VALID\n",
333 __func__);
334 ret = TMF_RESP_FUNC_COMPLETE;
335 }
336 /* Else - leave the default "failed" status alone. */
337
338 dev_dbg(&ihost->pdev->dev,
339 "%s: completed request = %p\n",
340 __func__,
341 ireq);
342
343 return ret;
344
345 err_tci:
346 spin_lock_irqsave(&ihost->scic_lock, flags);
347 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
348 spin_unlock_irqrestore(&ihost->scic_lock, flags);
349
350 return ret;
351}
352
353static void isci_task_build_tmf(struct isci_tmf *tmf,
354 enum isci_tmf_function_codes code)
355{
356 memset(tmf, 0, sizeof(*tmf));
357 tmf->tmf_code = code;
358}
359
360static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
361 enum isci_tmf_function_codes code,
362 struct isci_request *old_request)
363{
364 isci_task_build_tmf(tmf, code);
365 tmf->io_tag = old_request->io_tag;
366}
367
368/*
369 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
370 * Template functions.
371 * @lun: This parameter specifies the lun to be reset.
372 *
373 * status, zero indicates success.
374 */
375static int isci_task_send_lu_reset_sas(
376 struct isci_host *isci_host,
377 struct isci_remote_device *isci_device,
378 u8 *lun)
379{
380 struct isci_tmf tmf;
381 int ret = TMF_RESP_FUNC_FAILED;
382
383 dev_dbg(&isci_host->pdev->dev,
384 "%s: isci_host = %p, isci_device = %p\n",
385 __func__, isci_host, isci_device);
386 /* Send the LUN reset to the target. By the time the call returns,
387 * the TMF has fully exected in the target (in which case the return
388 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
389 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
390 */
391 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
392
393 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
394 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
395
396 if (ret == TMF_RESP_FUNC_COMPLETE)
397 dev_dbg(&isci_host->pdev->dev,
398 "%s: %p: TMF_LU_RESET passed\n",
399 __func__, isci_device);
400 else
401 dev_dbg(&isci_host->pdev->dev,
402 "%s: %p: TMF_LU_RESET failed (%x)\n",
403 __func__, isci_device, ret);
404
405 return ret;
406}
407
408int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
409{
410 struct isci_host *ihost = dev_to_ihost(dev);
411 struct isci_remote_device *idev;
412 unsigned long flags;
413 int ret = TMF_RESP_FUNC_COMPLETE;
414
415 spin_lock_irqsave(&ihost->scic_lock, flags);
416 idev = isci_get_device(dev->lldd_dev);
417 spin_unlock_irqrestore(&ihost->scic_lock, flags);
418
419 dev_dbg(&ihost->pdev->dev,
420 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
421 __func__, dev, ihost, idev);
422
423 if (!idev) {
424 /* If the device is gone, escalate to I_T_Nexus_Reset. */
425 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
426
427 ret = TMF_RESP_FUNC_FAILED;
428 goto out;
429 }
430
431 /* Suspend the RNC, kill all TCs */
432 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
433 != SCI_SUCCESS) {
434 /* The suspend/terminate only fails if isci_get_device fails */
435 ret = TMF_RESP_FUNC_FAILED;
436 goto out;
437 }
438 /* All pending I/Os have been terminated and cleaned up. */
439 if (!test_bit(IDEV_GONE, &idev->flags)) {
440 if (dev_is_sata(dev))
441 sas_ata_schedule_reset(dev);
442 else
443 /* Send the task management part of the reset. */
444 ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
445 }
446 out:
447 isci_put_device(idev);
448 return ret;
449}
450
451
452/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
453int isci_task_clear_nexus_port(struct asd_sas_port *port)
454{
455 return TMF_RESP_FUNC_FAILED;
456}
457
458
459
460int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
461{
462 return TMF_RESP_FUNC_FAILED;
463}
464
465/* Task Management Functions. Must be called from process context. */
466
467/**
468 * isci_task_abort_task() - This function is one of the SAS Domain Template
469 * functions. This function is called by libsas to abort a specified task.
470 * @task: This parameter specifies the SAS task to abort.
471 *
472 * status, zero indicates success.
473 */
474int isci_task_abort_task(struct sas_task *task)
475{
476 struct isci_host *ihost = dev_to_ihost(task->dev);
477 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
478 struct isci_request *old_request = NULL;
479 struct isci_remote_device *idev = NULL;
480 struct isci_tmf tmf;
481 int ret = TMF_RESP_FUNC_FAILED;
482 unsigned long flags;
483 int target_done_already = 0;
484
485 /* Get the isci_request reference from the task. Note that
486 * this check does not depend on the pending request list
487 * in the device, because tasks driving resets may land here
488 * after completion in the core.
489 */
490 spin_lock_irqsave(&ihost->scic_lock, flags);
491 spin_lock(&task->task_state_lock);
492
493 old_request = task->lldd_task;
494
495 /* If task is already done, the request isn't valid */
496 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
497 old_request) {
498 idev = isci_get_device(task->dev->lldd_dev);
499 target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
500 &old_request->flags);
501 }
502 spin_unlock(&task->task_state_lock);
503 spin_unlock_irqrestore(&ihost->scic_lock, flags);
504
505 dev_warn(&ihost->pdev->dev,
506 "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
507 __func__, idev,
508 (dev_is_sata(task->dev) ? "STP/SATA"
509 : ((dev_is_expander(task->dev->dev_type))
510 ? "SMP"
511 : "SSP")),
512 ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
513 ? " IDEV_GONE"
514 : "")
515 : " <NULL>"),
516 task, old_request);
517
518 /* Device reset conditions signalled in task_state_flags are the
519 * responsbility of libsas to observe at the start of the error
520 * handler thread.
521 */
522 if (!idev || !old_request) {
523 /* The request has already completed and there
524 * is nothing to do here other than to set the task
525 * done bit, and indicate that the task abort function
526 * was successful.
527 */
528 spin_lock_irqsave(&task->task_state_lock, flags);
529 task->task_state_flags |= SAS_TASK_STATE_DONE;
530 task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
531 spin_unlock_irqrestore(&task->task_state_lock, flags);
532
533 ret = TMF_RESP_FUNC_COMPLETE;
534
535 dev_warn(&ihost->pdev->dev,
536 "%s: abort task not needed for %p\n",
537 __func__, task);
538 goto out;
539 }
540 /* Suspend the RNC, kill the TC */
541 if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
542 != SCI_SUCCESS) {
543 dev_warn(&ihost->pdev->dev,
544 "%s: isci_remote_device_reset_terminate(dev=%p, "
545 "req=%p, task=%p) failed\n",
546 __func__, idev, old_request, task);
547 ret = TMF_RESP_FUNC_FAILED;
548 goto out;
549 }
550 spin_lock_irqsave(&ihost->scic_lock, flags);
551
552 if (task->task_proto == SAS_PROTOCOL_SMP ||
553 sas_protocol_ata(task->task_proto) ||
554 target_done_already ||
555 test_bit(IDEV_GONE, &idev->flags)) {
556
557 spin_unlock_irqrestore(&ihost->scic_lock, flags);
558
559 /* No task to send, so explicitly resume the device here */
560 isci_remote_device_resume_from_abort(ihost, idev);
561
562 dev_warn(&ihost->pdev->dev,
563 "%s: %s request"
564 " or complete_in_target (%d), "
565 "or IDEV_GONE (%d), thus no TMF\n",
566 __func__,
567 ((task->task_proto == SAS_PROTOCOL_SMP)
568 ? "SMP"
569 : (sas_protocol_ata(task->task_proto)
570 ? "SATA/STP"
571 : "<other>")
572 ),
573 test_bit(IREQ_COMPLETE_IN_TARGET,
574 &old_request->flags),
575 test_bit(IDEV_GONE, &idev->flags));
576
577 spin_lock_irqsave(&task->task_state_lock, flags);
578 task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
579 task->task_state_flags |= SAS_TASK_STATE_DONE;
580 spin_unlock_irqrestore(&task->task_state_lock, flags);
581
582 ret = TMF_RESP_FUNC_COMPLETE;
583 } else {
584 /* Fill in the tmf structure */
585 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
586 old_request);
587
588 spin_unlock_irqrestore(&ihost->scic_lock, flags);
589
590 /* Send the task management request. */
591 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
592 ret = isci_task_execute_tmf(ihost, idev, &tmf,
593 ISCI_ABORT_TASK_TIMEOUT_MS);
594 }
595out:
596 dev_warn(&ihost->pdev->dev,
597 "%s: Done; dev = %p, task = %p , old_request == %p\n",
598 __func__, idev, task, old_request);
599 isci_put_device(idev);
600 return ret;
601}
602
603/**
604 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
605 * functions. This is one of the Task Management functoins called by libsas,
606 * to abort all task for the given lun.
607 * @d_device: This parameter specifies the domain device associated with this
608 * request.
609 * @lun: This parameter specifies the lun associated with this request.
610 *
611 * status, zero indicates success.
612 */
613int isci_task_abort_task_set(
614 struct domain_device *d_device,
615 u8 *lun)
616{
617 return TMF_RESP_FUNC_FAILED;
618}
619
620
621/**
622 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
623 * functions. This is one of the Task Management functoins called by libsas.
624 * @d_device: This parameter specifies the domain device associated with this
625 * request.
626 * @lun: This parameter specifies the lun associated with this request.
627 *
628 * status, zero indicates success.
629 */
630int isci_task_clear_task_set(
631 struct domain_device *d_device,
632 u8 *lun)
633{
634 return TMF_RESP_FUNC_FAILED;
635}
636
637
638/**
639 * isci_task_query_task() - This function is implemented to cause libsas to
640 * correctly escalate the failed abort to a LUN or target reset (this is
641 * because sas_scsi_find_task libsas function does not correctly interpret
642 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
643 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
644 * returned, libsas will turn this into a target reset
645 * @task: This parameter specifies the sas task being queried.
646 *
647 * status, zero indicates success.
648 */
649int isci_task_query_task(
650 struct sas_task *task)
651{
652 /* See if there is a pending device reset for this device. */
653 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
654 return TMF_RESP_FUNC_FAILED;
655 else
656 return TMF_RESP_FUNC_SUCC;
657}
658
659/*
660 * isci_task_request_complete() - This function is called by the sci core when
661 * an task request completes.
662 * @ihost: This parameter specifies the ISCI host object
663 * @ireq: This parameter is the completed isci_request object.
664 * @completion_status: This parameter specifies the completion status from the
665 * sci core.
666 *
667 * none.
668 */
669void
670isci_task_request_complete(struct isci_host *ihost,
671 struct isci_request *ireq,
672 enum sci_task_status completion_status)
673{
674 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
675 struct completion *tmf_complete = NULL;
676
677 dev_dbg(&ihost->pdev->dev,
678 "%s: request = %p, status=%d\n",
679 __func__, ireq, completion_status);
680
681 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
682
683 if (tmf) {
684 tmf->status = completion_status;
685
686 if (tmf->proto == SAS_PROTOCOL_SSP) {
687 memcpy(tmf->resp.rsp_buf,
688 ireq->ssp.rsp_buf,
689 SSP_RESP_IU_MAX_SIZE);
690 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
691 memcpy(&tmf->resp.d2h_fis,
692 &ireq->stp.rsp,
693 sizeof(struct dev_to_host_fis));
694 }
695 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
696 tmf_complete = tmf->complete;
697 }
698 sci_controller_complete_io(ihost, ireq->target_device, ireq);
699 /* set the 'terminated' flag handle to make sure it cannot be terminated
700 * or completed again.
701 */
702 set_bit(IREQ_TERMINATED, &ireq->flags);
703
704 if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
705 wake_up_all(&ihost->eventq);
706
707 if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
708 isci_free_tag(ihost, ireq->io_tag);
709
710 /* The task management part completes last. */
711 if (tmf_complete)
712 complete(tmf_complete);
713}
714
715static int isci_reset_device(struct isci_host *ihost,
716 struct domain_device *dev,
717 struct isci_remote_device *idev)
718{
719 int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
720 struct sas_phy *phy = sas_get_local_phy(dev);
721 struct isci_port *iport = dev->port->lldd_port;
722
723 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
724
725 /* Suspend the RNC, terminate all outstanding TCs. */
726 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
727 != SCI_SUCCESS) {
728 rc = TMF_RESP_FUNC_FAILED;
729 goto out;
730 }
731 /* Note that since the termination for outstanding requests succeeded,
732 * this function will return success. This is because the resets will
733 * only fail if the device has been removed (ie. hotplug), and the
734 * primary duty of this function is to cleanup tasks, so that is the
735 * relevant status.
736 */
737 if (!test_bit(IDEV_GONE, &idev->flags)) {
738 if (scsi_is_sas_phy_local(phy)) {
739 struct isci_phy *iphy = &ihost->phys[phy->number];
740
741 reset_stat = isci_port_perform_hard_reset(ihost, iport,
742 iphy);
743 } else
744 reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
745 }
746 /* Explicitly resume the RNC here, since there was no task sent. */
747 isci_remote_device_resume_from_abort(ihost, idev);
748
749 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
750 __func__, idev, reset_stat);
751 out:
752 sas_put_local_phy(phy);
753 return rc;
754}
755
756int isci_task_I_T_nexus_reset(struct domain_device *dev)
757{
758 struct isci_host *ihost = dev_to_ihost(dev);
759 struct isci_remote_device *idev;
760 unsigned long flags;
761 int ret;
762
763 spin_lock_irqsave(&ihost->scic_lock, flags);
764 idev = isci_get_device(dev->lldd_dev);
765 spin_unlock_irqrestore(&ihost->scic_lock, flags);
766
767 if (!idev) {
768 /* XXX: need to cleanup any ireqs targeting this
769 * domain_device
770 */
771 ret = -ENODEV;
772 goto out;
773 }
774
775 ret = isci_reset_device(ihost, dev, idev);
776 out:
777 isci_put_device(idev);
778 return ret;
779}