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-rw-r--r--drivers/scsi/isci/task.c1675
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diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
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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 enum isci_completion_selection disposition;
82
83 disposition = isci_perform_normal_io_completion;
84 disposition = isci_task_set_completion_status(task, response, status,
85 disposition);
86
87 /* Tasks aborted specifically by a call to the lldd_abort_task
88 * function should not be completed to the host in the regular path.
89 */
90 switch (disposition) {
91 case isci_perform_normal_io_completion:
92 /* Normal notification (task_done) */
93 dev_dbg(&ihost->pdev->dev,
94 "%s: Normal - task = %p, response=%d, "
95 "status=%d\n",
96 __func__, task, response, status);
97
98 task->lldd_task = NULL;
99
100 isci_execpath_callback(ihost, task, task->task_done);
101 break;
102
103 case isci_perform_aborted_io_completion:
104 /* No notification because this request is already in the
105 * abort path.
106 */
107 dev_dbg(&ihost->pdev->dev,
108 "%s: Aborted - task = %p, response=%d, "
109 "status=%d\n",
110 __func__, task, response, status);
111 break;
112
113 case isci_perform_error_io_completion:
114 /* Use sas_task_abort */
115 dev_dbg(&ihost->pdev->dev,
116 "%s: Error - task = %p, response=%d, "
117 "status=%d\n",
118 __func__, task, response, status);
119
120 isci_execpath_callback(ihost, task, sas_task_abort);
121 break;
122
123 default:
124 dev_dbg(&ihost->pdev->dev,
125 "%s: isci task notification default case!",
126 __func__);
127 sas_task_abort(task);
128 break;
129 }
130}
131
132#define for_each_sas_task(num, task) \
133 for (; num > 0; num--,\
134 task = list_entry(task->list.next, struct sas_task, list))
135
136
137static inline int isci_device_io_ready(struct isci_remote_device *idev,
138 struct sas_task *task)
139{
140 return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
141 (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
142 isci_task_is_ncq_recovery(task))
143 : 0;
144}
145/**
146 * isci_task_execute_task() - This function is one of the SAS Domain Template
147 * functions. This function is called by libsas to send a task down to
148 * hardware.
149 * @task: This parameter specifies the SAS task to send.
150 * @num: This parameter specifies the number of tasks to queue.
151 * @gfp_flags: This parameter specifies the context of this call.
152 *
153 * status, zero indicates success.
154 */
155int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
156{
157 struct isci_host *ihost = dev_to_ihost(task->dev);
158 struct isci_remote_device *idev;
159 unsigned long flags;
160 bool io_ready;
161 u16 tag;
162
163 dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
164
165 for_each_sas_task(num, task) {
166 enum sci_status status = SCI_FAILURE;
167
168 spin_lock_irqsave(&ihost->scic_lock, flags);
169 idev = isci_lookup_device(task->dev);
170 io_ready = isci_device_io_ready(idev, task);
171 tag = isci_alloc_tag(ihost);
172 spin_unlock_irqrestore(&ihost->scic_lock, flags);
173
174 dev_dbg(&ihost->pdev->dev,
175 "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
176 task, num, task->dev, idev, idev ? idev->flags : 0,
177 task->uldd_task);
178
179 if (!idev) {
180 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
181 SAS_DEVICE_UNKNOWN);
182 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
183 /* Indicate QUEUE_FULL so that the scsi midlayer
184 * retries.
185 */
186 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
187 SAS_QUEUE_FULL);
188 } else {
189 /* There is a device and it's ready for I/O. */
190 spin_lock_irqsave(&task->task_state_lock, flags);
191
192 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
193 /* The I/O was aborted. */
194 spin_unlock_irqrestore(&task->task_state_lock,
195 flags);
196
197 isci_task_refuse(ihost, task,
198 SAS_TASK_UNDELIVERED,
199 SAM_STAT_TASK_ABORTED);
200 } else {
201 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
202 spin_unlock_irqrestore(&task->task_state_lock, flags);
203
204 /* build and send the request. */
205 status = isci_request_execute(ihost, idev, task, tag);
206
207 if (status != SCI_SUCCESS) {
208
209 spin_lock_irqsave(&task->task_state_lock, flags);
210 /* Did not really start this command. */
211 task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
212 spin_unlock_irqrestore(&task->task_state_lock, flags);
213
214 /* Indicate QUEUE_FULL so that the scsi
215 * midlayer retries. if the request
216 * failed for remote device reasons,
217 * it gets returned as
218 * SAS_TASK_UNDELIVERED next time
219 * through.
220 */
221 isci_task_refuse(ihost, task,
222 SAS_TASK_COMPLETE,
223 SAS_QUEUE_FULL);
224 }
225 }
226 }
227 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
228 spin_lock_irqsave(&ihost->scic_lock, flags);
229 /* command never hit the device, so just free
230 * the tci and skip the sequence increment
231 */
232 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
233 spin_unlock_irqrestore(&ihost->scic_lock, flags);
234 }
235 isci_put_device(idev);
236 }
237 return 0;
238}
239
240static enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq)
241{
242 struct isci_tmf *isci_tmf;
243 enum sci_status status;
244
245 if (tmf_task != ireq->ttype)
246 return SCI_FAILURE;
247
248 isci_tmf = isci_request_access_tmf(ireq);
249
250 switch (isci_tmf->tmf_code) {
251
252 case isci_tmf_sata_srst_high:
253 case isci_tmf_sata_srst_low: {
254 struct host_to_dev_fis *fis = &ireq->stp.cmd;
255
256 memset(fis, 0, sizeof(*fis));
257
258 fis->fis_type = 0x27;
259 fis->flags &= ~0x80;
260 fis->flags &= 0xF0;
261 if (isci_tmf->tmf_code == isci_tmf_sata_srst_high)
262 fis->control |= ATA_SRST;
263 else
264 fis->control &= ~ATA_SRST;
265 break;
266 }
267 /* other management commnd go here... */
268 default:
269 return SCI_FAILURE;
270 }
271
272 /* core builds the protocol specific request
273 * based on the h2d fis.
274 */
275 status = sci_task_request_construct_sata(ireq);
276
277 return status;
278}
279
280static struct isci_request *isci_task_request_build(struct isci_host *ihost,
281 struct isci_remote_device *idev,
282 u16 tag, struct isci_tmf *isci_tmf)
283{
284 enum sci_status status = SCI_FAILURE;
285 struct isci_request *ireq = NULL;
286 struct domain_device *dev;
287
288 dev_dbg(&ihost->pdev->dev,
289 "%s: isci_tmf = %p\n", __func__, isci_tmf);
290
291 dev = idev->domain_dev;
292
293 /* do common allocation and init of request object. */
294 ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
295 if (!ireq)
296 return NULL;
297
298 /* let the core do it's construct. */
299 status = sci_task_request_construct(ihost, idev, tag,
300 ireq);
301
302 if (status != SCI_SUCCESS) {
303 dev_warn(&ihost->pdev->dev,
304 "%s: sci_task_request_construct failed - "
305 "status = 0x%x\n",
306 __func__,
307 status);
308 return NULL;
309 }
310
311 /* XXX convert to get this from task->tproto like other drivers */
312 if (dev->dev_type == SAS_END_DEV) {
313 isci_tmf->proto = SAS_PROTOCOL_SSP;
314 status = sci_task_request_construct_ssp(ireq);
315 if (status != SCI_SUCCESS)
316 return NULL;
317 }
318
319 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
320 isci_tmf->proto = SAS_PROTOCOL_SATA;
321 status = isci_sata_management_task_request_build(ireq);
322
323 if (status != SCI_SUCCESS)
324 return NULL;
325 }
326 return ireq;
327}
328
329static int isci_task_execute_tmf(struct isci_host *ihost,
330 struct isci_remote_device *idev,
331 struct isci_tmf *tmf, unsigned long timeout_ms)
332{
333 DECLARE_COMPLETION_ONSTACK(completion);
334 enum sci_task_status status = SCI_TASK_FAILURE;
335 struct isci_request *ireq;
336 int ret = TMF_RESP_FUNC_FAILED;
337 unsigned long flags;
338 unsigned long timeleft;
339 u16 tag;
340
341 spin_lock_irqsave(&ihost->scic_lock, flags);
342 tag = isci_alloc_tag(ihost);
343 spin_unlock_irqrestore(&ihost->scic_lock, flags);
344
345 if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
346 return ret;
347
348 /* sanity check, return TMF_RESP_FUNC_FAILED
349 * if the device is not there and ready.
350 */
351 if (!idev ||
352 (!test_bit(IDEV_IO_READY, &idev->flags) &&
353 !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
354 dev_dbg(&ihost->pdev->dev,
355 "%s: idev = %p not ready (%#lx)\n",
356 __func__,
357 idev, idev ? idev->flags : 0);
358 goto err_tci;
359 } else
360 dev_dbg(&ihost->pdev->dev,
361 "%s: idev = %p\n",
362 __func__, idev);
363
364 /* Assign the pointer to the TMF's completion kernel wait structure. */
365 tmf->complete = &completion;
366
367 ireq = isci_task_request_build(ihost, idev, tag, tmf);
368 if (!ireq)
369 goto err_tci;
370
371 spin_lock_irqsave(&ihost->scic_lock, flags);
372
373 /* start the TMF io. */
374 status = sci_controller_start_task(ihost, idev, ireq);
375
376 if (status != SCI_TASK_SUCCESS) {
377 dev_dbg(&ihost->pdev->dev,
378 "%s: start_io failed - status = 0x%x, request = %p\n",
379 __func__,
380 status,
381 ireq);
382 spin_unlock_irqrestore(&ihost->scic_lock, flags);
383 goto err_tci;
384 }
385
386 if (tmf->cb_state_func != NULL)
387 tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
388
389 isci_request_change_state(ireq, started);
390
391 /* add the request to the remote device request list. */
392 list_add(&ireq->dev_node, &idev->reqs_in_process);
393
394 spin_unlock_irqrestore(&ihost->scic_lock, flags);
395
396 /* Wait for the TMF to complete, or a timeout. */
397 timeleft = wait_for_completion_timeout(&completion,
398 msecs_to_jiffies(timeout_ms));
399
400 if (timeleft == 0) {
401 spin_lock_irqsave(&ihost->scic_lock, flags);
402
403 if (tmf->cb_state_func != NULL)
404 tmf->cb_state_func(isci_tmf_timed_out, tmf, tmf->cb_data);
405
406 sci_controller_terminate_request(ihost,
407 idev,
408 ireq);
409
410 spin_unlock_irqrestore(&ihost->scic_lock, flags);
411
412 wait_for_completion(tmf->complete);
413 }
414
415 isci_print_tmf(tmf);
416
417 if (tmf->status == SCI_SUCCESS)
418 ret = TMF_RESP_FUNC_COMPLETE;
419 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
420 dev_dbg(&ihost->pdev->dev,
421 "%s: tmf.status == "
422 "SCI_FAILURE_IO_RESPONSE_VALID\n",
423 __func__);
424 ret = TMF_RESP_FUNC_COMPLETE;
425 }
426 /* Else - leave the default "failed" status alone. */
427
428 dev_dbg(&ihost->pdev->dev,
429 "%s: completed request = %p\n",
430 __func__,
431 ireq);
432
433 return ret;
434
435 err_tci:
436 spin_lock_irqsave(&ihost->scic_lock, flags);
437 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
438 spin_unlock_irqrestore(&ihost->scic_lock, flags);
439
440 return ret;
441}
442
443static void isci_task_build_tmf(struct isci_tmf *tmf,
444 enum isci_tmf_function_codes code,
445 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
446 struct isci_tmf *,
447 void *),
448 void *cb_data)
449{
450 memset(tmf, 0, sizeof(*tmf));
451
452 tmf->tmf_code = code;
453 tmf->cb_state_func = tmf_sent_cb;
454 tmf->cb_data = cb_data;
455}
456
457static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
458 enum isci_tmf_function_codes code,
459 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
460 struct isci_tmf *,
461 void *),
462 struct isci_request *old_request)
463{
464 isci_task_build_tmf(tmf, code, tmf_sent_cb, old_request);
465 tmf->io_tag = old_request->io_tag;
466}
467
468/**
469 * isci_task_validate_request_to_abort() - This function checks the given I/O
470 * against the "started" state. If the request is still "started", it's
471 * state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
472 * BEFORE CALLING THIS FUNCTION.
473 * @isci_request: This parameter specifies the request object to control.
474 * @isci_host: This parameter specifies the ISCI host object
475 * @isci_device: This is the device to which the request is pending.
476 * @aborted_io_completion: This is a completion structure that will be added to
477 * the request in case it is changed to aborting; this completion is
478 * triggered when the request is fully completed.
479 *
480 * Either "started" on successful change of the task status to "aborted", or
481 * "unallocated" if the task cannot be controlled.
482 */
483static enum isci_request_status isci_task_validate_request_to_abort(
484 struct isci_request *isci_request,
485 struct isci_host *isci_host,
486 struct isci_remote_device *isci_device,
487 struct completion *aborted_io_completion)
488{
489 enum isci_request_status old_state = unallocated;
490
491 /* Only abort the task if it's in the
492 * device's request_in_process list
493 */
494 if (isci_request && !list_empty(&isci_request->dev_node)) {
495 old_state = isci_request_change_started_to_aborted(
496 isci_request, aborted_io_completion);
497
498 }
499
500 return old_state;
501}
502
503/**
504* isci_request_cleanup_completed_loiterer() - This function will take care of
505* the final cleanup on any request which has been explicitly terminated.
506* @isci_host: This parameter specifies the ISCI host object
507* @isci_device: This is the device to which the request is pending.
508* @isci_request: This parameter specifies the terminated request object.
509* @task: This parameter is the libsas I/O request.
510*/
511static void isci_request_cleanup_completed_loiterer(
512 struct isci_host *isci_host,
513 struct isci_remote_device *isci_device,
514 struct isci_request *isci_request,
515 struct sas_task *task)
516{
517 unsigned long flags;
518
519 dev_dbg(&isci_host->pdev->dev,
520 "%s: isci_device=%p, request=%p, task=%p\n",
521 __func__, isci_device, isci_request, task);
522
523 if (task != NULL) {
524
525 spin_lock_irqsave(&task->task_state_lock, flags);
526 task->lldd_task = NULL;
527
528 task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
529
530 isci_set_task_doneflags(task);
531
532 /* If this task is not in the abort path, call task_done. */
533 if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
534
535 spin_unlock_irqrestore(&task->task_state_lock, flags);
536 task->task_done(task);
537 } else
538 spin_unlock_irqrestore(&task->task_state_lock, flags);
539 }
540
541 if (isci_request != NULL) {
542 spin_lock_irqsave(&isci_host->scic_lock, flags);
543 list_del_init(&isci_request->dev_node);
544 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
545 }
546}
547
548/**
549 * isci_terminate_request_core() - This function will terminate the given
550 * request, and wait for it to complete. This function must only be called
551 * from a thread that can wait. Note that the request is terminated and
552 * completed (back to the host, if started there).
553 * @ihost: This SCU.
554 * @idev: The target.
555 * @isci_request: The I/O request to be terminated.
556 *
557 */
558static void isci_terminate_request_core(struct isci_host *ihost,
559 struct isci_remote_device *idev,
560 struct isci_request *isci_request)
561{
562 enum sci_status status = SCI_SUCCESS;
563 bool was_terminated = false;
564 bool needs_cleanup_handling = false;
565 enum isci_request_status request_status;
566 unsigned long flags;
567 unsigned long termination_completed = 1;
568 struct completion *io_request_completion;
569 struct sas_task *task;
570
571 dev_dbg(&ihost->pdev->dev,
572 "%s: device = %p; request = %p\n",
573 __func__, idev, isci_request);
574
575 spin_lock_irqsave(&ihost->scic_lock, flags);
576
577 io_request_completion = isci_request->io_request_completion;
578
579 task = (isci_request->ttype == io_task)
580 ? isci_request_access_task(isci_request)
581 : NULL;
582
583 /* Note that we are not going to control
584 * the target to abort the request.
585 */
586 set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->flags);
587
588 /* Make sure the request wasn't just sitting around signalling
589 * device condition (if the request handle is NULL, then the
590 * request completed but needed additional handling here).
591 */
592 if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
593 was_terminated = true;
594 needs_cleanup_handling = true;
595 status = sci_controller_terminate_request(ihost,
596 idev,
597 isci_request);
598 }
599 spin_unlock_irqrestore(&ihost->scic_lock, flags);
600
601 /*
602 * The only time the request to terminate will
603 * fail is when the io request is completed and
604 * being aborted.
605 */
606 if (status != SCI_SUCCESS) {
607 dev_dbg(&ihost->pdev->dev,
608 "%s: sci_controller_terminate_request"
609 " returned = 0x%x\n",
610 __func__, status);
611
612 isci_request->io_request_completion = NULL;
613
614 } else {
615 if (was_terminated) {
616 dev_dbg(&ihost->pdev->dev,
617 "%s: before completion wait (%p/%p)\n",
618 __func__, isci_request, io_request_completion);
619
620 /* Wait here for the request to complete. */
621 #define TERMINATION_TIMEOUT_MSEC 500
622 termination_completed
623 = wait_for_completion_timeout(
624 io_request_completion,
625 msecs_to_jiffies(TERMINATION_TIMEOUT_MSEC));
626
627 if (!termination_completed) {
628
629 /* The request to terminate has timed out. */
630 spin_lock_irqsave(&ihost->scic_lock,
631 flags);
632
633 /* Check for state changes. */
634 if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
635
636 /* The best we can do is to have the
637 * request die a silent death if it
638 * ever really completes.
639 *
640 * Set the request state to "dead",
641 * and clear the task pointer so that
642 * an actual completion event callback
643 * doesn't do anything.
644 */
645 isci_request->status = dead;
646 isci_request->io_request_completion
647 = NULL;
648
649 if (isci_request->ttype == io_task) {
650
651 /* Break links with the
652 * sas_task.
653 */
654 isci_request->ttype_ptr.io_task_ptr
655 = NULL;
656 }
657 } else
658 termination_completed = 1;
659
660 spin_unlock_irqrestore(&ihost->scic_lock,
661 flags);
662
663 if (!termination_completed) {
664
665 dev_dbg(&ihost->pdev->dev,
666 "%s: *** Timeout waiting for "
667 "termination(%p/%p)\n",
668 __func__, io_request_completion,
669 isci_request);
670
671 /* The request can no longer be referenced
672 * safely since it may go away if the
673 * termination every really does complete.
674 */
675 isci_request = NULL;
676 }
677 }
678 if (termination_completed)
679 dev_dbg(&ihost->pdev->dev,
680 "%s: after completion wait (%p/%p)\n",
681 __func__, isci_request, io_request_completion);
682 }
683
684 if (termination_completed) {
685
686 isci_request->io_request_completion = NULL;
687
688 /* Peek at the status of the request. This will tell
689 * us if there was special handling on the request such that it
690 * needs to be detached and freed here.
691 */
692 spin_lock_irqsave(&isci_request->state_lock, flags);
693 request_status = isci_request->status;
694
695 if ((isci_request->ttype == io_task) /* TMFs are in their own thread */
696 && ((request_status == aborted)
697 || (request_status == aborting)
698 || (request_status == terminating)
699 || (request_status == completed)
700 || (request_status == dead)
701 )
702 ) {
703
704 /* The completion routine won't free a request in
705 * the aborted/aborting/etc. states, so we do
706 * it here.
707 */
708 needs_cleanup_handling = true;
709 }
710 spin_unlock_irqrestore(&isci_request->state_lock, flags);
711
712 }
713 if (needs_cleanup_handling)
714 isci_request_cleanup_completed_loiterer(
715 ihost, idev, isci_request, task);
716 }
717}
718
719/**
720 * isci_terminate_pending_requests() - This function will change the all of the
721 * requests on the given device's state to "aborting", will terminate the
722 * requests, and wait for them to complete. This function must only be
723 * called from a thread that can wait. Note that the requests are all
724 * terminated and completed (back to the host, if started there).
725 * @isci_host: This parameter specifies SCU.
726 * @idev: This parameter specifies the target.
727 *
728 */
729void isci_terminate_pending_requests(struct isci_host *ihost,
730 struct isci_remote_device *idev)
731{
732 struct completion request_completion;
733 enum isci_request_status old_state;
734 unsigned long flags;
735 LIST_HEAD(list);
736
737 spin_lock_irqsave(&ihost->scic_lock, flags);
738 list_splice_init(&idev->reqs_in_process, &list);
739
740 /* assumes that isci_terminate_request_core deletes from the list */
741 while (!list_empty(&list)) {
742 struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
743
744 /* Change state to "terminating" if it is currently
745 * "started".
746 */
747 old_state = isci_request_change_started_to_newstate(ireq,
748 &request_completion,
749 terminating);
750 switch (old_state) {
751 case started:
752 case completed:
753 case aborting:
754 break;
755 default:
756 /* termination in progress, or otherwise dispositioned.
757 * We know the request was on 'list' so should be safe
758 * to move it back to reqs_in_process
759 */
760 list_move(&ireq->dev_node, &idev->reqs_in_process);
761 ireq = NULL;
762 break;
763 }
764
765 if (!ireq)
766 continue;
767 spin_unlock_irqrestore(&ihost->scic_lock, flags);
768
769 init_completion(&request_completion);
770
771 dev_dbg(&ihost->pdev->dev,
772 "%s: idev=%p request=%p; task=%p old_state=%d\n",
773 __func__, idev, ireq,
774 ireq->ttype == io_task ? isci_request_access_task(ireq) : NULL,
775 old_state);
776
777 /* If the old_state is started:
778 * This request was not already being aborted. If it had been,
779 * then the aborting I/O (ie. the TMF request) would not be in
780 * the aborting state, and thus would be terminated here. Note
781 * that since the TMF completion's call to the kernel function
782 * "complete()" does not happen until the pending I/O request
783 * terminate fully completes, we do not have to implement a
784 * special wait here for already aborting requests - the
785 * termination of the TMF request will force the request
786 * to finish it's already started terminate.
787 *
788 * If old_state == completed:
789 * This request completed from the SCU hardware perspective
790 * and now just needs cleaning up in terms of freeing the
791 * request and potentially calling up to libsas.
792 *
793 * If old_state == aborting:
794 * This request has already gone through a TMF timeout, but may
795 * not have been terminated; needs cleaning up at least.
796 */
797 isci_terminate_request_core(ihost, idev, ireq);
798 spin_lock_irqsave(&ihost->scic_lock, flags);
799 }
800 spin_unlock_irqrestore(&ihost->scic_lock, flags);
801}
802
803/**
804 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
805 * Template functions.
806 * @lun: This parameter specifies the lun to be reset.
807 *
808 * status, zero indicates success.
809 */
810static int isci_task_send_lu_reset_sas(
811 struct isci_host *isci_host,
812 struct isci_remote_device *isci_device,
813 u8 *lun)
814{
815 struct isci_tmf tmf;
816 int ret = TMF_RESP_FUNC_FAILED;
817
818 dev_dbg(&isci_host->pdev->dev,
819 "%s: isci_host = %p, isci_device = %p\n",
820 __func__, isci_host, isci_device);
821 /* Send the LUN reset to the target. By the time the call returns,
822 * the TMF has fully exected in the target (in which case the return
823 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
824 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
825 */
826 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL);
827
828 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
829 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
830
831 if (ret == TMF_RESP_FUNC_COMPLETE)
832 dev_dbg(&isci_host->pdev->dev,
833 "%s: %p: TMF_LU_RESET passed\n",
834 __func__, isci_device);
835 else
836 dev_dbg(&isci_host->pdev->dev,
837 "%s: %p: TMF_LU_RESET failed (%x)\n",
838 __func__, isci_device, ret);
839
840 return ret;
841}
842
843static int isci_task_send_lu_reset_sata(struct isci_host *ihost,
844 struct isci_remote_device *idev, u8 *lun)
845{
846 int ret = TMF_RESP_FUNC_FAILED;
847 struct isci_tmf tmf;
848
849 /* Send the soft reset to the target */
850 #define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
851 isci_task_build_tmf(&tmf, isci_tmf_sata_srst_high, NULL, NULL);
852
853 ret = isci_task_execute_tmf(ihost, idev, &tmf, ISCI_SRST_TIMEOUT_MS);
854
855 if (ret != TMF_RESP_FUNC_COMPLETE) {
856 dev_dbg(&ihost->pdev->dev,
857 "%s: Assert SRST failed (%p) = %x",
858 __func__, idev, ret);
859
860 /* Return the failure so that the LUN reset is escalated
861 * to a target reset.
862 */
863 }
864 return ret;
865}
866
867/**
868 * isci_task_lu_reset() - This function is one of the SAS Domain Template
869 * functions. This is one of the Task Management functoins called by libsas,
870 * to reset the given lun. Note the assumption that while this call is
871 * executing, no I/O will be sent by the host to the device.
872 * @lun: This parameter specifies the lun to be reset.
873 *
874 * status, zero indicates success.
875 */
876int isci_task_lu_reset(struct domain_device *domain_device, u8 *lun)
877{
878 struct isci_host *isci_host = dev_to_ihost(domain_device);
879 struct isci_remote_device *isci_device;
880 unsigned long flags;
881 int ret;
882
883 spin_lock_irqsave(&isci_host->scic_lock, flags);
884 isci_device = isci_lookup_device(domain_device);
885 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
886
887 dev_dbg(&isci_host->pdev->dev,
888 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
889 __func__, domain_device, isci_host, isci_device);
890
891 if (isci_device)
892 set_bit(IDEV_EH, &isci_device->flags);
893
894 /* If there is a device reset pending on any request in the
895 * device's list, fail this LUN reset request in order to
896 * escalate to the device reset.
897 */
898 if (!isci_device ||
899 isci_device_is_reset_pending(isci_host, isci_device)) {
900 dev_dbg(&isci_host->pdev->dev,
901 "%s: No dev (%p), or "
902 "RESET PENDING: domain_device=%p\n",
903 __func__, isci_device, domain_device);
904 ret = TMF_RESP_FUNC_FAILED;
905 goto out;
906 }
907
908 /* Send the task management part of the reset. */
909 if (sas_protocol_ata(domain_device->tproto)) {
910 ret = isci_task_send_lu_reset_sata(isci_host, isci_device, lun);
911 } else
912 ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
913
914 /* If the LUN reset worked, all the I/O can now be terminated. */
915 if (ret == TMF_RESP_FUNC_COMPLETE)
916 /* Terminate all I/O now. */
917 isci_terminate_pending_requests(isci_host,
918 isci_device);
919
920 out:
921 isci_put_device(isci_device);
922 return ret;
923}
924
925
926/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
927int isci_task_clear_nexus_port(struct asd_sas_port *port)
928{
929 return TMF_RESP_FUNC_FAILED;
930}
931
932
933
934int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
935{
936 return TMF_RESP_FUNC_FAILED;
937}
938
939/* Task Management Functions. Must be called from process context. */
940
941/**
942 * isci_abort_task_process_cb() - This is a helper function for the abort task
943 * TMF command. It manages the request state with respect to the successful
944 * transmission / completion of the abort task request.
945 * @cb_state: This parameter specifies when this function was called - after
946 * the TMF request has been started and after it has timed-out.
947 * @tmf: This parameter specifies the TMF in progress.
948 *
949 *
950 */
951static void isci_abort_task_process_cb(
952 enum isci_tmf_cb_state cb_state,
953 struct isci_tmf *tmf,
954 void *cb_data)
955{
956 struct isci_request *old_request;
957
958 old_request = (struct isci_request *)cb_data;
959
960 dev_dbg(&old_request->isci_host->pdev->dev,
961 "%s: tmf=%p, old_request=%p\n",
962 __func__, tmf, old_request);
963
964 switch (cb_state) {
965
966 case isci_tmf_started:
967 /* The TMF has been started. Nothing to do here, since the
968 * request state was already set to "aborted" by the abort
969 * task function.
970 */
971 if ((old_request->status != aborted)
972 && (old_request->status != completed))
973 dev_dbg(&old_request->isci_host->pdev->dev,
974 "%s: Bad request status (%d): tmf=%p, old_request=%p\n",
975 __func__, old_request->status, tmf, old_request);
976 break;
977
978 case isci_tmf_timed_out:
979
980 /* Set the task's state to "aborting", since the abort task
981 * function thread set it to "aborted" (above) in anticipation
982 * of the task management request working correctly. Since the
983 * timeout has now fired, the TMF request failed. We set the
984 * state such that the request completion will indicate the
985 * device is no longer present.
986 */
987 isci_request_change_state(old_request, aborting);
988 break;
989
990 default:
991 dev_dbg(&old_request->isci_host->pdev->dev,
992 "%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
993 __func__, cb_state, tmf, old_request);
994 break;
995 }
996}
997
998/**
999 * isci_task_abort_task() - This function is one of the SAS Domain Template
1000 * functions. This function is called by libsas to abort a specified task.
1001 * @task: This parameter specifies the SAS task to abort.
1002 *
1003 * status, zero indicates success.
1004 */
1005int isci_task_abort_task(struct sas_task *task)
1006{
1007 struct isci_host *isci_host = dev_to_ihost(task->dev);
1008 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
1009 struct isci_request *old_request = NULL;
1010 enum isci_request_status old_state;
1011 struct isci_remote_device *isci_device = NULL;
1012 struct isci_tmf tmf;
1013 int ret = TMF_RESP_FUNC_FAILED;
1014 unsigned long flags;
1015 bool any_dev_reset = false;
1016
1017 /* Get the isci_request reference from the task. Note that
1018 * this check does not depend on the pending request list
1019 * in the device, because tasks driving resets may land here
1020 * after completion in the core.
1021 */
1022 spin_lock_irqsave(&isci_host->scic_lock, flags);
1023 spin_lock(&task->task_state_lock);
1024
1025 old_request = task->lldd_task;
1026
1027 /* If task is already done, the request isn't valid */
1028 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
1029 (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
1030 old_request)
1031 isci_device = isci_lookup_device(task->dev);
1032
1033 spin_unlock(&task->task_state_lock);
1034 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1035
1036 dev_dbg(&isci_host->pdev->dev,
1037 "%s: task = %p\n", __func__, task);
1038
1039 if (!isci_device || !old_request)
1040 goto out;
1041
1042 set_bit(IDEV_EH, &isci_device->flags);
1043
1044 /* This version of the driver will fail abort requests for
1045 * SATA/STP. Failing the abort request this way will cause the
1046 * SCSI error handler thread to escalate to LUN reset
1047 */
1048 if (sas_protocol_ata(task->task_proto)) {
1049 dev_dbg(&isci_host->pdev->dev,
1050 " task %p is for a STP/SATA device;"
1051 " returning TMF_RESP_FUNC_FAILED\n"
1052 " to cause a LUN reset...\n", task);
1053 goto out;
1054 }
1055
1056 dev_dbg(&isci_host->pdev->dev,
1057 "%s: old_request == %p\n", __func__, old_request);
1058
1059 any_dev_reset = isci_device_is_reset_pending(isci_host,isci_device);
1060
1061 spin_lock_irqsave(&task->task_state_lock, flags);
1062
1063 any_dev_reset = any_dev_reset || (task->task_state_flags & SAS_TASK_NEED_DEV_RESET);
1064
1065 /* If the extraction of the request reference from the task
1066 * failed, then the request has been completed (or if there is a
1067 * pending reset then this abort request function must be failed
1068 * in order to escalate to the target reset).
1069 */
1070 if ((old_request == NULL) || any_dev_reset) {
1071
1072 /* If the device reset task flag is set, fail the task
1073 * management request. Otherwise, the original request
1074 * has completed.
1075 */
1076 if (any_dev_reset) {
1077
1078 /* Turn off the task's DONE to make sure this
1079 * task is escalated to a target reset.
1080 */
1081 task->task_state_flags &= ~SAS_TASK_STATE_DONE;
1082
1083 /* Make the reset happen as soon as possible. */
1084 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
1085
1086 spin_unlock_irqrestore(&task->task_state_lock, flags);
1087
1088 /* Fail the task management request in order to
1089 * escalate to the target reset.
1090 */
1091 ret = TMF_RESP_FUNC_FAILED;
1092
1093 dev_dbg(&isci_host->pdev->dev,
1094 "%s: Failing task abort in order to "
1095 "escalate to target reset because\n"
1096 "SAS_TASK_NEED_DEV_RESET is set for "
1097 "task %p on dev %p\n",
1098 __func__, task, isci_device);
1099
1100
1101 } else {
1102 /* The request has already completed and there
1103 * is nothing to do here other than to set the task
1104 * done bit, and indicate that the task abort function
1105 * was sucessful.
1106 */
1107 isci_set_task_doneflags(task);
1108
1109 spin_unlock_irqrestore(&task->task_state_lock, flags);
1110
1111 ret = TMF_RESP_FUNC_COMPLETE;
1112
1113 dev_dbg(&isci_host->pdev->dev,
1114 "%s: abort task not needed for %p\n",
1115 __func__, task);
1116 }
1117 goto out;
1118 }
1119 else
1120 spin_unlock_irqrestore(&task->task_state_lock, flags);
1121
1122 spin_lock_irqsave(&isci_host->scic_lock, flags);
1123
1124 /* Check the request status and change to "aborted" if currently
1125 * "starting"; if true then set the I/O kernel completion
1126 * struct that will be triggered when the request completes.
1127 */
1128 old_state = isci_task_validate_request_to_abort(
1129 old_request, isci_host, isci_device,
1130 &aborted_io_completion);
1131 if ((old_state != started) &&
1132 (old_state != completed) &&
1133 (old_state != aborting)) {
1134
1135 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1136
1137 /* The request was already being handled by someone else (because
1138 * they got to set the state away from started).
1139 */
1140 dev_dbg(&isci_host->pdev->dev,
1141 "%s: device = %p; old_request %p already being aborted\n",
1142 __func__,
1143 isci_device, old_request);
1144 ret = TMF_RESP_FUNC_COMPLETE;
1145 goto out;
1146 }
1147 if (task->task_proto == SAS_PROTOCOL_SMP ||
1148 test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
1149
1150 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1151
1152 dev_dbg(&isci_host->pdev->dev,
1153 "%s: SMP request (%d)"
1154 " or complete_in_target (%d), thus no TMF\n",
1155 __func__, (task->task_proto == SAS_PROTOCOL_SMP),
1156 test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
1157
1158 /* Set the state on the task. */
1159 isci_task_all_done(task);
1160
1161 ret = TMF_RESP_FUNC_COMPLETE;
1162
1163 /* Stopping and SMP devices are not sent a TMF, and are not
1164 * reset, but the outstanding I/O request is terminated below.
1165 */
1166 } else {
1167 /* Fill in the tmf stucture */
1168 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
1169 isci_abort_task_process_cb,
1170 old_request);
1171
1172 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1173
1174 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* half second timeout. */
1175 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
1176 ISCI_ABORT_TASK_TIMEOUT_MS);
1177
1178 if (ret != TMF_RESP_FUNC_COMPLETE)
1179 dev_dbg(&isci_host->pdev->dev,
1180 "%s: isci_task_send_tmf failed\n",
1181 __func__);
1182 }
1183 if (ret == TMF_RESP_FUNC_COMPLETE) {
1184 set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
1185
1186 /* Clean up the request on our side, and wait for the aborted
1187 * I/O to complete.
1188 */
1189 isci_terminate_request_core(isci_host, isci_device, old_request);
1190 }
1191
1192 /* Make sure we do not leave a reference to aborted_io_completion */
1193 old_request->io_request_completion = NULL;
1194 out:
1195 isci_put_device(isci_device);
1196 return ret;
1197}
1198
1199/**
1200 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
1201 * functions. This is one of the Task Management functoins called by libsas,
1202 * to abort all task for the given lun.
1203 * @d_device: This parameter specifies the domain device associated with this
1204 * request.
1205 * @lun: This parameter specifies the lun associated with this request.
1206 *
1207 * status, zero indicates success.
1208 */
1209int isci_task_abort_task_set(
1210 struct domain_device *d_device,
1211 u8 *lun)
1212{
1213 return TMF_RESP_FUNC_FAILED;
1214}
1215
1216
1217/**
1218 * isci_task_clear_aca() - This function is one of the SAS Domain Template
1219 * functions. This is one of the Task Management functoins called by libsas.
1220 * @d_device: This parameter specifies the domain device associated with this
1221 * request.
1222 * @lun: This parameter specifies the lun associated with this request.
1223 *
1224 * status, zero indicates success.
1225 */
1226int isci_task_clear_aca(
1227 struct domain_device *d_device,
1228 u8 *lun)
1229{
1230 return TMF_RESP_FUNC_FAILED;
1231}
1232
1233
1234
1235/**
1236 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
1237 * functions. This is one of the Task Management functoins called by libsas.
1238 * @d_device: This parameter specifies the domain device associated with this
1239 * request.
1240 * @lun: This parameter specifies the lun associated with this request.
1241 *
1242 * status, zero indicates success.
1243 */
1244int isci_task_clear_task_set(
1245 struct domain_device *d_device,
1246 u8 *lun)
1247{
1248 return TMF_RESP_FUNC_FAILED;
1249}
1250
1251
1252/**
1253 * isci_task_query_task() - This function is implemented to cause libsas to
1254 * correctly escalate the failed abort to a LUN or target reset (this is
1255 * because sas_scsi_find_task libsas function does not correctly interpret
1256 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
1257 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
1258 * returned, libsas will turn this into a target reset
1259 * @task: This parameter specifies the sas task being queried.
1260 * @lun: This parameter specifies the lun associated with this request.
1261 *
1262 * status, zero indicates success.
1263 */
1264int isci_task_query_task(
1265 struct sas_task *task)
1266{
1267 /* See if there is a pending device reset for this device. */
1268 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
1269 return TMF_RESP_FUNC_FAILED;
1270 else
1271 return TMF_RESP_FUNC_SUCC;
1272}
1273
1274/*
1275 * isci_task_request_complete() - This function is called by the sci core when
1276 * an task request completes.
1277 * @ihost: This parameter specifies the ISCI host object
1278 * @ireq: This parameter is the completed isci_request object.
1279 * @completion_status: This parameter specifies the completion status from the
1280 * sci core.
1281 *
1282 * none.
1283 */
1284void
1285isci_task_request_complete(struct isci_host *ihost,
1286 struct isci_request *ireq,
1287 enum sci_task_status completion_status)
1288{
1289 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
1290 struct completion *tmf_complete;
1291
1292 dev_dbg(&ihost->pdev->dev,
1293 "%s: request = %p, status=%d\n",
1294 __func__, ireq, completion_status);
1295
1296 isci_request_change_state(ireq, completed);
1297
1298 tmf->status = completion_status;
1299 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
1300
1301 if (tmf->proto == SAS_PROTOCOL_SSP) {
1302 memcpy(&tmf->resp.resp_iu,
1303 &ireq->ssp.rsp,
1304 SSP_RESP_IU_MAX_SIZE);
1305 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
1306 memcpy(&tmf->resp.d2h_fis,
1307 &ireq->stp.rsp,
1308 sizeof(struct dev_to_host_fis));
1309 }
1310
1311 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
1312 tmf_complete = tmf->complete;
1313
1314 sci_controller_complete_io(ihost, ireq->target_device, ireq);
1315 /* set the 'terminated' flag handle to make sure it cannot be terminated
1316 * or completed again.
1317 */
1318 set_bit(IREQ_TERMINATED, &ireq->flags);
1319
1320 isci_request_change_state(ireq, unallocated);
1321 list_del_init(&ireq->dev_node);
1322
1323 /* The task management part completes last. */
1324 complete(tmf_complete);
1325}
1326
1327static void isci_smp_task_timedout(unsigned long _task)
1328{
1329 struct sas_task *task = (void *) _task;
1330 unsigned long flags;
1331
1332 spin_lock_irqsave(&task->task_state_lock, flags);
1333 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1334 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1335 spin_unlock_irqrestore(&task->task_state_lock, flags);
1336
1337 complete(&task->completion);
1338}
1339
1340static void isci_smp_task_done(struct sas_task *task)
1341{
1342 if (!del_timer(&task->timer))
1343 return;
1344 complete(&task->completion);
1345}
1346
1347static struct sas_task *isci_alloc_task(void)
1348{
1349 struct sas_task *task = kzalloc(sizeof(*task), GFP_KERNEL);
1350
1351 if (task) {
1352 INIT_LIST_HEAD(&task->list);
1353 spin_lock_init(&task->task_state_lock);
1354 task->task_state_flags = SAS_TASK_STATE_PENDING;
1355 init_timer(&task->timer);
1356 init_completion(&task->completion);
1357 }
1358
1359 return task;
1360}
1361
1362static void isci_free_task(struct isci_host *ihost, struct sas_task *task)
1363{
1364 if (task) {
1365 BUG_ON(!list_empty(&task->list));
1366 kfree(task);
1367 }
1368}
1369
1370static int isci_smp_execute_task(struct isci_host *ihost,
1371 struct domain_device *dev, void *req,
1372 int req_size, void *resp, int resp_size)
1373{
1374 int res, retry;
1375 struct sas_task *task = NULL;
1376
1377 for (retry = 0; retry < 3; retry++) {
1378 task = isci_alloc_task();
1379 if (!task)
1380 return -ENOMEM;
1381
1382 task->dev = dev;
1383 task->task_proto = dev->tproto;
1384 sg_init_one(&task->smp_task.smp_req, req, req_size);
1385 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
1386
1387 task->task_done = isci_smp_task_done;
1388
1389 task->timer.data = (unsigned long) task;
1390 task->timer.function = isci_smp_task_timedout;
1391 task->timer.expires = jiffies + 10*HZ;
1392 add_timer(&task->timer);
1393
1394 res = isci_task_execute_task(task, 1, GFP_KERNEL);
1395
1396 if (res) {
1397 del_timer(&task->timer);
1398 dev_dbg(&ihost->pdev->dev,
1399 "%s: executing SMP task failed:%d\n",
1400 __func__, res);
1401 goto ex_err;
1402 }
1403
1404 wait_for_completion(&task->completion);
1405 res = -ECOMM;
1406 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1407 dev_dbg(&ihost->pdev->dev,
1408 "%s: smp task timed out or aborted\n",
1409 __func__);
1410 isci_task_abort_task(task);
1411 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1412 dev_dbg(&ihost->pdev->dev,
1413 "%s: SMP task aborted and not done\n",
1414 __func__);
1415 goto ex_err;
1416 }
1417 }
1418 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1419 task->task_status.stat == SAM_STAT_GOOD) {
1420 res = 0;
1421 break;
1422 }
1423 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1424 task->task_status.stat == SAS_DATA_UNDERRUN) {
1425 /* no error, but return the number of bytes of
1426 * underrun */
1427 res = task->task_status.residual;
1428 break;
1429 }
1430 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1431 task->task_status.stat == SAS_DATA_OVERRUN) {
1432 res = -EMSGSIZE;
1433 break;
1434 } else {
1435 dev_dbg(&ihost->pdev->dev,
1436 "%s: task to dev %016llx response: 0x%x "
1437 "status 0x%x\n", __func__,
1438 SAS_ADDR(dev->sas_addr),
1439 task->task_status.resp,
1440 task->task_status.stat);
1441 isci_free_task(ihost, task);
1442 task = NULL;
1443 }
1444 }
1445ex_err:
1446 BUG_ON(retry == 3 && task != NULL);
1447 isci_free_task(ihost, task);
1448 return res;
1449}
1450
1451#define DISCOVER_REQ_SIZE 16
1452#define DISCOVER_RESP_SIZE 56
1453
1454int isci_smp_get_phy_attached_dev_type(struct isci_host *ihost,
1455 struct domain_device *dev,
1456 int phy_id, int *adt)
1457{
1458 struct smp_resp *disc_resp;
1459 u8 *disc_req;
1460 int res;
1461
1462 disc_resp = kzalloc(DISCOVER_RESP_SIZE, GFP_KERNEL);
1463 if (!disc_resp)
1464 return -ENOMEM;
1465
1466 disc_req = kzalloc(DISCOVER_REQ_SIZE, GFP_KERNEL);
1467 if (disc_req) {
1468 disc_req[0] = SMP_REQUEST;
1469 disc_req[1] = SMP_DISCOVER;
1470 disc_req[9] = phy_id;
1471 } else {
1472 kfree(disc_resp);
1473 return -ENOMEM;
1474 }
1475 res = isci_smp_execute_task(ihost, dev, disc_req, DISCOVER_REQ_SIZE,
1476 disc_resp, DISCOVER_RESP_SIZE);
1477 if (!res) {
1478 if (disc_resp->result != SMP_RESP_FUNC_ACC)
1479 res = disc_resp->result;
1480 else
1481 *adt = disc_resp->disc.attached_dev_type;
1482 }
1483 kfree(disc_req);
1484 kfree(disc_resp);
1485
1486 return res;
1487}
1488
1489static void isci_wait_for_smp_phy_reset(struct isci_remote_device *idev, int phy_num)
1490{
1491 struct domain_device *dev = idev->domain_dev;
1492 struct isci_port *iport = idev->isci_port;
1493 struct isci_host *ihost = iport->isci_host;
1494 int res, iteration = 0, attached_device_type;
1495 #define STP_WAIT_MSECS 25000
1496 unsigned long tmo = msecs_to_jiffies(STP_WAIT_MSECS);
1497 unsigned long deadline = jiffies + tmo;
1498 enum {
1499 SMP_PHYWAIT_PHYDOWN,
1500 SMP_PHYWAIT_PHYUP,
1501 SMP_PHYWAIT_DONE
1502 } phy_state = SMP_PHYWAIT_PHYDOWN;
1503
1504 /* While there is time, wait for the phy to go away and come back */
1505 while (time_is_after_jiffies(deadline) && phy_state != SMP_PHYWAIT_DONE) {
1506 int event = atomic_read(&iport->event);
1507
1508 ++iteration;
1509
1510 tmo = wait_event_timeout(ihost->eventq,
1511 event != atomic_read(&iport->event) ||
1512 !test_bit(IPORT_BCN_BLOCKED, &iport->flags),
1513 tmo);
1514 /* link down, stop polling */
1515 if (!test_bit(IPORT_BCN_BLOCKED, &iport->flags))
1516 break;
1517
1518 dev_dbg(&ihost->pdev->dev,
1519 "%s: iport %p, iteration %d,"
1520 " phase %d: time_remaining %lu, bcns = %d\n",
1521 __func__, iport, iteration, phy_state,
1522 tmo, test_bit(IPORT_BCN_PENDING, &iport->flags));
1523
1524 res = isci_smp_get_phy_attached_dev_type(ihost, dev, phy_num,
1525 &attached_device_type);
1526 tmo = deadline - jiffies;
1527
1528 if (res) {
1529 dev_dbg(&ihost->pdev->dev,
1530 "%s: iteration %d, phase %d:"
1531 " SMP error=%d, time_remaining=%lu\n",
1532 __func__, iteration, phy_state, res, tmo);
1533 break;
1534 }
1535 dev_dbg(&ihost->pdev->dev,
1536 "%s: iport %p, iteration %d,"
1537 " phase %d: time_remaining %lu, bcns = %d, "
1538 "attdevtype = %x\n",
1539 __func__, iport, iteration, phy_state,
1540 tmo, test_bit(IPORT_BCN_PENDING, &iport->flags),
1541 attached_device_type);
1542
1543 switch (phy_state) {
1544 case SMP_PHYWAIT_PHYDOWN:
1545 /* Has the device gone away? */
1546 if (!attached_device_type)
1547 phy_state = SMP_PHYWAIT_PHYUP;
1548
1549 break;
1550
1551 case SMP_PHYWAIT_PHYUP:
1552 /* Has the device come back? */
1553 if (attached_device_type)
1554 phy_state = SMP_PHYWAIT_DONE;
1555 break;
1556
1557 case SMP_PHYWAIT_DONE:
1558 break;
1559 }
1560
1561 }
1562 dev_dbg(&ihost->pdev->dev, "%s: done\n", __func__);
1563}
1564
1565static int isci_reset_device(struct isci_host *ihost,
1566 struct isci_remote_device *idev)
1567{
1568 struct sas_phy *phy = sas_find_local_phy(idev->domain_dev);
1569 struct isci_port *iport = idev->isci_port;
1570 enum sci_status status;
1571 unsigned long flags;
1572 int rc;
1573
1574 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
1575
1576 spin_lock_irqsave(&ihost->scic_lock, flags);
1577 status = sci_remote_device_reset(idev);
1578 if (status != SCI_SUCCESS) {
1579 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1580
1581 dev_dbg(&ihost->pdev->dev,
1582 "%s: sci_remote_device_reset(%p) returned %d!\n",
1583 __func__, idev, status);
1584
1585 return TMF_RESP_FUNC_FAILED;
1586 }
1587 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1588
1589 /* Make sure all pending requests are able to be fully terminated. */
1590 isci_device_clear_reset_pending(ihost, idev);
1591
1592 /* If this is a device on an expander, disable BCN processing. */
1593 if (!scsi_is_sas_phy_local(phy))
1594 set_bit(IPORT_BCN_BLOCKED, &iport->flags);
1595
1596 rc = sas_phy_reset(phy, true);
1597
1598 /* Terminate in-progress I/O now. */
1599 isci_remote_device_nuke_requests(ihost, idev);
1600
1601 /* Since all pending TCs have been cleaned, resume the RNC. */
1602 spin_lock_irqsave(&ihost->scic_lock, flags);
1603 status = sci_remote_device_reset_complete(idev);
1604 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1605
1606 /* If this is a device on an expander, bring the phy back up. */
1607 if (!scsi_is_sas_phy_local(phy)) {
1608 /* A phy reset will cause the device to go away then reappear.
1609 * Since libsas will take action on incoming BCNs (eg. remove
1610 * a device going through an SMP phy-control driven reset),
1611 * we need to wait until the phy comes back up before letting
1612 * discovery proceed in libsas.
1613 */
1614 isci_wait_for_smp_phy_reset(idev, phy->number);
1615
1616 spin_lock_irqsave(&ihost->scic_lock, flags);
1617 isci_port_bcn_enable(ihost, idev->isci_port);
1618 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1619 }
1620
1621 if (status != SCI_SUCCESS) {
1622 dev_dbg(&ihost->pdev->dev,
1623 "%s: sci_remote_device_reset_complete(%p) "
1624 "returned %d!\n", __func__, idev, status);
1625 }
1626
1627 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
1628
1629 return rc;
1630}
1631
1632int isci_task_I_T_nexus_reset(struct domain_device *dev)
1633{
1634 struct isci_host *ihost = dev_to_ihost(dev);
1635 struct isci_remote_device *idev;
1636 unsigned long flags;
1637 int ret;
1638
1639 spin_lock_irqsave(&ihost->scic_lock, flags);
1640 idev = isci_lookup_device(dev);
1641 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1642
1643 if (!idev || !test_bit(IDEV_EH, &idev->flags)) {
1644 ret = TMF_RESP_FUNC_COMPLETE;
1645 goto out;
1646 }
1647
1648 ret = isci_reset_device(ihost, idev);
1649 out:
1650 isci_put_device(idev);
1651 return ret;
1652}
1653
1654int isci_bus_reset_handler(struct scsi_cmnd *cmd)
1655{
1656 struct domain_device *dev = sdev_to_domain_dev(cmd->device);
1657 struct isci_host *ihost = dev_to_ihost(dev);
1658 struct isci_remote_device *idev;
1659 unsigned long flags;
1660 int ret;
1661
1662 spin_lock_irqsave(&ihost->scic_lock, flags);
1663 idev = isci_lookup_device(dev);
1664 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1665
1666 if (!idev) {
1667 ret = TMF_RESP_FUNC_COMPLETE;
1668 goto out;
1669 }
1670
1671 ret = isci_reset_device(ihost, idev);
1672 out:
1673 isci_put_device(idev);
1674 return ret;
1675}
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-29 17:30:03 -0400