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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_AT_INITIATOR |
95 SAS_TASK_STATE_PENDING);
96 task->lldd_task = NULL;
97 spin_unlock_irqrestore(&task->task_state_lock, flags);
98
99 task->task_done(task);
100}
101
102#define for_each_sas_task(num, task) \
103 for (; num > 0; num--,\
104 task = list_entry(task->list.next, struct sas_task, list))
105
106
107static inline int isci_device_io_ready(struct isci_remote_device *idev,
108 struct sas_task *task)
109{
110 return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
111 (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
112 isci_task_is_ncq_recovery(task))
113 : 0;
114}
115/**
116 * isci_task_execute_task() - This function is one of the SAS Domain Template
117 * functions. This function is called by libsas to send a task down to
118 * hardware.
119 * @task: This parameter specifies the SAS task to send.
120 * @gfp_flags: This parameter specifies the context of this call.
121 *
122 * status, zero indicates success.
123 */
124int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
125{
126 struct isci_host *ihost = dev_to_ihost(task->dev);
127 struct isci_remote_device *idev;
128 unsigned long flags;
129 enum sci_status status = SCI_FAILURE;
130 bool io_ready;
131 u16 tag;
132
133 spin_lock_irqsave(&ihost->scic_lock, flags);
134 idev = isci_lookup_device(task->dev);
135 io_ready = isci_device_io_ready(idev, task);
136 tag = isci_alloc_tag(ihost);
137 spin_unlock_irqrestore(&ihost->scic_lock, flags);
138
139 dev_dbg(&ihost->pdev->dev,
140 "task: %p, dev: %p idev: %p:%#lx cmd = %p\n",
141 task, task->dev, idev, idev ? idev->flags : 0,
142 task->uldd_task);
143
144 if (!idev) {
145 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
146 SAS_DEVICE_UNKNOWN);
147 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
148 /* Indicate QUEUE_FULL so that the scsi midlayer
149 * retries.
150 */
151 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
152 SAS_QUEUE_FULL);
153 } else {
154 /* There is a device and it's ready for I/O. */
155 spin_lock_irqsave(&task->task_state_lock, flags);
156
157 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
158 /* The I/O was aborted. */
159 spin_unlock_irqrestore(&task->task_state_lock, flags);
160
161 isci_task_refuse(ihost, task,
162 SAS_TASK_UNDELIVERED,
163 SAS_SAM_STAT_TASK_ABORTED);
164 } else {
165 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
166 spin_unlock_irqrestore(&task->task_state_lock, flags);
167
168 /* build and send the request. */
169 status = isci_request_execute(ihost, idev, task, tag);
170
171 if (status != SCI_SUCCESS) {
172 spin_lock_irqsave(&task->task_state_lock, flags);
173 /* Did not really start this command. */
174 task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
175 spin_unlock_irqrestore(&task->task_state_lock, flags);
176
177 if (test_bit(IDEV_GONE, &idev->flags)) {
178 /* Indicate that the device
179 * is gone.
180 */
181 isci_task_refuse(ihost, task,
182 SAS_TASK_UNDELIVERED,
183 SAS_DEVICE_UNKNOWN);
184 } else {
185 /* Indicate QUEUE_FULL so that
186 * the scsi midlayer retries.
187 * If the request failed for
188 * remote device reasons, it
189 * gets returned as
190 * SAS_TASK_UNDELIVERED next
191 * time through.
192 */
193 isci_task_refuse(ihost, task,
194 SAS_TASK_COMPLETE,
195 SAS_QUEUE_FULL);
196 }
197 }
198 }
199 }
200
201 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
202 spin_lock_irqsave(&ihost->scic_lock, flags);
203 /* command never hit the device, so just free
204 * the tci and skip the sequence increment
205 */
206 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
207 spin_unlock_irqrestore(&ihost->scic_lock, flags);
208 }
209
210 isci_put_device(idev);
211 return 0;
212}
213
214static struct isci_request *isci_task_request_build(struct isci_host *ihost,
215 struct isci_remote_device *idev,
216 u16 tag, struct isci_tmf *isci_tmf)
217{
218 enum sci_status status = SCI_FAILURE;
219 struct isci_request *ireq = NULL;
220 struct domain_device *dev;
221
222 dev_dbg(&ihost->pdev->dev,
223 "%s: isci_tmf = %p\n", __func__, isci_tmf);
224
225 dev = idev->domain_dev;
226
227 /* do common allocation and init of request object. */
228 ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
229 if (!ireq)
230 return NULL;
231
232 /* let the core do it's construct. */
233 status = sci_task_request_construct(ihost, idev, tag,
234 ireq);
235
236 if (status != SCI_SUCCESS) {
237 dev_warn(&ihost->pdev->dev,
238 "%s: sci_task_request_construct failed - "
239 "status = 0x%x\n",
240 __func__,
241 status);
242 return NULL;
243 }
244
245 /* XXX convert to get this from task->tproto like other drivers */
246 if (dev->dev_type == SAS_END_DEVICE) {
247 isci_tmf->proto = SAS_PROTOCOL_SSP;
248 status = sci_task_request_construct_ssp(ireq);
249 if (status != SCI_SUCCESS)
250 return NULL;
251 }
252
253 return ireq;
254}
255
256static int isci_task_execute_tmf(struct isci_host *ihost,
257 struct isci_remote_device *idev,
258 struct isci_tmf *tmf, unsigned long timeout_ms)
259{
260 DECLARE_COMPLETION_ONSTACK(completion);
261 enum sci_status status = SCI_FAILURE;
262 struct isci_request *ireq;
263 int ret = TMF_RESP_FUNC_FAILED;
264 unsigned long flags;
265 unsigned long timeleft;
266 u16 tag;
267
268 spin_lock_irqsave(&ihost->scic_lock, flags);
269 tag = isci_alloc_tag(ihost);
270 spin_unlock_irqrestore(&ihost->scic_lock, flags);
271
272 if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
273 return ret;
274
275 /* sanity check, return TMF_RESP_FUNC_FAILED
276 * if the device is not there and ready.
277 */
278 if (!idev ||
279 (!test_bit(IDEV_IO_READY, &idev->flags) &&
280 !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
281 dev_dbg(&ihost->pdev->dev,
282 "%s: idev = %p not ready (%#lx)\n",
283 __func__,
284 idev, idev ? idev->flags : 0);
285 goto err_tci;
286 } else
287 dev_dbg(&ihost->pdev->dev,
288 "%s: idev = %p\n",
289 __func__, idev);
290
291 /* Assign the pointer to the TMF's completion kernel wait structure. */
292 tmf->complete = &completion;
293 tmf->status = SCI_FAILURE_TIMEOUT;
294
295 ireq = isci_task_request_build(ihost, idev, tag, tmf);
296 if (!ireq)
297 goto err_tci;
298
299 spin_lock_irqsave(&ihost->scic_lock, flags);
300
301 /* start the TMF io. */
302 status = sci_controller_start_task(ihost, idev, ireq);
303
304 if (status != SCI_SUCCESS) {
305 dev_dbg(&ihost->pdev->dev,
306 "%s: start_io failed - status = 0x%x, request = %p\n",
307 __func__,
308 status,
309 ireq);
310 spin_unlock_irqrestore(&ihost->scic_lock, flags);
311 goto err_tci;
312 }
313 spin_unlock_irqrestore(&ihost->scic_lock, flags);
314
315 /* The RNC must be unsuspended before the TMF can get a response. */
316 isci_remote_device_resume_from_abort(ihost, idev);
317
318 /* Wait for the TMF to complete, or a timeout. */
319 timeleft = wait_for_completion_timeout(&completion,
320 msecs_to_jiffies(timeout_ms));
321
322 if (timeleft == 0) {
323 /* The TMF did not complete - this could be because
324 * of an unplug. Terminate the TMF request now.
325 */
326 isci_remote_device_suspend_terminate(ihost, idev, ireq);
327 }
328
329 isci_print_tmf(ihost, tmf);
330
331 if (tmf->status == SCI_SUCCESS)
332 ret = TMF_RESP_FUNC_COMPLETE;
333 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
334 dev_dbg(&ihost->pdev->dev,
335 "%s: tmf.status == "
336 "SCI_FAILURE_IO_RESPONSE_VALID\n",
337 __func__);
338 ret = TMF_RESP_FUNC_COMPLETE;
339 }
340 /* Else - leave the default "failed" status alone. */
341
342 dev_dbg(&ihost->pdev->dev,
343 "%s: completed request = %p\n",
344 __func__,
345 ireq);
346
347 return ret;
348
349 err_tci:
350 spin_lock_irqsave(&ihost->scic_lock, flags);
351 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
352 spin_unlock_irqrestore(&ihost->scic_lock, flags);
353
354 return ret;
355}
356
357static void isci_task_build_tmf(struct isci_tmf *tmf,
358 enum isci_tmf_function_codes code)
359{
360 memset(tmf, 0, sizeof(*tmf));
361 tmf->tmf_code = code;
362}
363
364static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
365 enum isci_tmf_function_codes code,
366 struct isci_request *old_request)
367{
368 isci_task_build_tmf(tmf, code);
369 tmf->io_tag = old_request->io_tag;
370}
371
372/*
373 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
374 * Template functions.
375 * @lun: This parameter specifies the lun to be reset.
376 *
377 * status, zero indicates success.
378 */
379static int isci_task_send_lu_reset_sas(
380 struct isci_host *isci_host,
381 struct isci_remote_device *isci_device,
382 u8 *lun)
383{
384 struct isci_tmf tmf;
385 int ret = TMF_RESP_FUNC_FAILED;
386
387 dev_dbg(&isci_host->pdev->dev,
388 "%s: isci_host = %p, isci_device = %p\n",
389 __func__, isci_host, isci_device);
390 /* Send the LUN reset to the target. By the time the call returns,
391 * the TMF has fully exected in the target (in which case the return
392 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
393 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
394 */
395 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
396
397 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
398 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
399
400 if (ret == TMF_RESP_FUNC_COMPLETE)
401 dev_dbg(&isci_host->pdev->dev,
402 "%s: %p: TMF_LU_RESET passed\n",
403 __func__, isci_device);
404 else
405 dev_dbg(&isci_host->pdev->dev,
406 "%s: %p: TMF_LU_RESET failed (%x)\n",
407 __func__, isci_device, ret);
408
409 return ret;
410}
411
412int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
413{
414 struct isci_host *ihost = dev_to_ihost(dev);
415 struct isci_remote_device *idev;
416 unsigned long flags;
417 int ret = TMF_RESP_FUNC_COMPLETE;
418
419 spin_lock_irqsave(&ihost->scic_lock, flags);
420 idev = isci_get_device(dev->lldd_dev);
421 spin_unlock_irqrestore(&ihost->scic_lock, flags);
422
423 dev_dbg(&ihost->pdev->dev,
424 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
425 __func__, dev, ihost, idev);
426
427 if (!idev) {
428 /* If the device is gone, escalate to I_T_Nexus_Reset. */
429 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
430
431 ret = TMF_RESP_FUNC_FAILED;
432 goto out;
433 }
434
435 /* Suspend the RNC, kill all TCs */
436 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
437 != SCI_SUCCESS) {
438 /* The suspend/terminate only fails if isci_get_device fails */
439 ret = TMF_RESP_FUNC_FAILED;
440 goto out;
441 }
442 /* All pending I/Os have been terminated and cleaned up. */
443 if (!test_bit(IDEV_GONE, &idev->flags)) {
444 if (dev_is_sata(dev))
445 sas_ata_schedule_reset(dev);
446 else
447 /* Send the task management part of the reset. */
448 ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
449 }
450 out:
451 isci_put_device(idev);
452 return ret;
453}
454
455
456/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
457int isci_task_clear_nexus_port(struct asd_sas_port *port)
458{
459 return TMF_RESP_FUNC_FAILED;
460}
461
462
463
464int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
465{
466 return TMF_RESP_FUNC_FAILED;
467}
468
469/* Task Management Functions. Must be called from process context. */
470
471/**
472 * isci_task_abort_task() - This function is one of the SAS Domain Template
473 * functions. This function is called by libsas to abort a specified task.
474 * @task: This parameter specifies the SAS task to abort.
475 *
476 * status, zero indicates success.
477 */
478int isci_task_abort_task(struct sas_task *task)
479{
480 struct isci_host *ihost = dev_to_ihost(task->dev);
481 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
482 struct isci_request *old_request = NULL;
483 struct isci_remote_device *idev = NULL;
484 struct isci_tmf tmf;
485 int ret = TMF_RESP_FUNC_FAILED;
486 unsigned long flags;
487 int target_done_already = 0;
488
489 /* Get the isci_request reference from the task. Note that
490 * this check does not depend on the pending request list
491 * in the device, because tasks driving resets may land here
492 * after completion in the core.
493 */
494 spin_lock_irqsave(&ihost->scic_lock, flags);
495 spin_lock(&task->task_state_lock);
496
497 old_request = task->lldd_task;
498
499 /* If task is already done, the request isn't valid */
500 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
501 (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
502 old_request) {
503 idev = isci_get_device(task->dev->lldd_dev);
504 target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
505 &old_request->flags);
506 }
507 spin_unlock(&task->task_state_lock);
508 spin_unlock_irqrestore(&ihost->scic_lock, flags);
509
510 dev_warn(&ihost->pdev->dev,
511 "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
512 __func__, idev,
513 (dev_is_sata(task->dev) ? "STP/SATA"
514 : ((dev_is_expander(task->dev->dev_type))
515 ? "SMP"
516 : "SSP")),
517 ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
518 ? " IDEV_GONE"
519 : "")
520 : " <NULL>"),
521 task, old_request);
522
523 /* Device reset conditions signalled in task_state_flags are the
524 * responsbility of libsas to observe at the start of the error
525 * handler thread.
526 */
527 if (!idev || !old_request) {
528 /* The request has already completed and there
529 * is nothing to do here other than to set the task
530 * done bit, and indicate that the task abort function
531 * was successful.
532 */
533 spin_lock_irqsave(&task->task_state_lock, flags);
534 task->task_state_flags |= SAS_TASK_STATE_DONE;
535 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
536 SAS_TASK_STATE_PENDING);
537 spin_unlock_irqrestore(&task->task_state_lock, flags);
538
539 ret = TMF_RESP_FUNC_COMPLETE;
540
541 dev_warn(&ihost->pdev->dev,
542 "%s: abort task not needed for %p\n",
543 __func__, task);
544 goto out;
545 }
546 /* Suspend the RNC, kill the TC */
547 if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
548 != SCI_SUCCESS) {
549 dev_warn(&ihost->pdev->dev,
550 "%s: isci_remote_device_reset_terminate(dev=%p, "
551 "req=%p, task=%p) failed\n",
552 __func__, idev, old_request, task);
553 ret = TMF_RESP_FUNC_FAILED;
554 goto out;
555 }
556 spin_lock_irqsave(&ihost->scic_lock, flags);
557
558 if (task->task_proto == SAS_PROTOCOL_SMP ||
559 sas_protocol_ata(task->task_proto) ||
560 target_done_already ||
561 test_bit(IDEV_GONE, &idev->flags)) {
562
563 spin_unlock_irqrestore(&ihost->scic_lock, flags);
564
565 /* No task to send, so explicitly resume the device here */
566 isci_remote_device_resume_from_abort(ihost, idev);
567
568 dev_warn(&ihost->pdev->dev,
569 "%s: %s request"
570 " or complete_in_target (%d), "
571 "or IDEV_GONE (%d), thus no TMF\n",
572 __func__,
573 ((task->task_proto == SAS_PROTOCOL_SMP)
574 ? "SMP"
575 : (sas_protocol_ata(task->task_proto)
576 ? "SATA/STP"
577 : "<other>")
578 ),
579 test_bit(IREQ_COMPLETE_IN_TARGET,
580 &old_request->flags),
581 test_bit(IDEV_GONE, &idev->flags));
582
583 spin_lock_irqsave(&task->task_state_lock, flags);
584 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
585 SAS_TASK_STATE_PENDING);
586 task->task_state_flags |= SAS_TASK_STATE_DONE;
587 spin_unlock_irqrestore(&task->task_state_lock, flags);
588
589 ret = TMF_RESP_FUNC_COMPLETE;
590 } else {
591 /* Fill in the tmf structure */
592 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
593 old_request);
594
595 spin_unlock_irqrestore(&ihost->scic_lock, flags);
596
597 /* Send the task management request. */
598 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
599 ret = isci_task_execute_tmf(ihost, idev, &tmf,
600 ISCI_ABORT_TASK_TIMEOUT_MS);
601 }
602out:
603 dev_warn(&ihost->pdev->dev,
604 "%s: Done; dev = %p, task = %p , old_request == %p\n",
605 __func__, idev, task, old_request);
606 isci_put_device(idev);
607 return ret;
608}
609
610/**
611 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
612 * functions. This is one of the Task Management functoins called by libsas,
613 * to abort all task for the given lun.
614 * @d_device: This parameter specifies the domain device associated with this
615 * request.
616 * @lun: This parameter specifies the lun associated with this request.
617 *
618 * status, zero indicates success.
619 */
620int isci_task_abort_task_set(
621 struct domain_device *d_device,
622 u8 *lun)
623{
624 return TMF_RESP_FUNC_FAILED;
625}
626
627
628/**
629 * isci_task_clear_aca() - This function is one of the SAS Domain Template
630 * functions. This is one of the Task Management functoins called by libsas.
631 * @d_device: This parameter specifies the domain device associated with this
632 * request.
633 * @lun: This parameter specifies the lun associated with this request.
634 *
635 * status, zero indicates success.
636 */
637int isci_task_clear_aca(
638 struct domain_device *d_device,
639 u8 *lun)
640{
641 return TMF_RESP_FUNC_FAILED;
642}
643
644
645
646/**
647 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
648 * functions. This is one of the Task Management functoins called by libsas.
649 * @d_device: This parameter specifies the domain device associated with this
650 * request.
651 * @lun: This parameter specifies the lun associated with this request.
652 *
653 * status, zero indicates success.
654 */
655int isci_task_clear_task_set(
656 struct domain_device *d_device,
657 u8 *lun)
658{
659 return TMF_RESP_FUNC_FAILED;
660}
661
662
663/**
664 * isci_task_query_task() - This function is implemented to cause libsas to
665 * correctly escalate the failed abort to a LUN or target reset (this is
666 * because sas_scsi_find_task libsas function does not correctly interpret
667 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
668 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
669 * returned, libsas will turn this into a target reset
670 * @task: This parameter specifies the sas task being queried.
671 *
672 * status, zero indicates success.
673 */
674int isci_task_query_task(
675 struct sas_task *task)
676{
677 /* See if there is a pending device reset for this device. */
678 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
679 return TMF_RESP_FUNC_FAILED;
680 else
681 return TMF_RESP_FUNC_SUCC;
682}
683
684/*
685 * isci_task_request_complete() - This function is called by the sci core when
686 * an task request completes.
687 * @ihost: This parameter specifies the ISCI host object
688 * @ireq: This parameter is the completed isci_request object.
689 * @completion_status: This parameter specifies the completion status from the
690 * sci core.
691 *
692 * none.
693 */
694void
695isci_task_request_complete(struct isci_host *ihost,
696 struct isci_request *ireq,
697 enum sci_task_status completion_status)
698{
699 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
700 struct completion *tmf_complete = NULL;
701
702 dev_dbg(&ihost->pdev->dev,
703 "%s: request = %p, status=%d\n",
704 __func__, ireq, completion_status);
705
706 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
707
708 if (tmf) {
709 tmf->status = completion_status;
710
711 if (tmf->proto == SAS_PROTOCOL_SSP) {
712 memcpy(tmf->resp.rsp_buf,
713 ireq->ssp.rsp_buf,
714 SSP_RESP_IU_MAX_SIZE);
715 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
716 memcpy(&tmf->resp.d2h_fis,
717 &ireq->stp.rsp,
718 sizeof(struct dev_to_host_fis));
719 }
720 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
721 tmf_complete = tmf->complete;
722 }
723 sci_controller_complete_io(ihost, ireq->target_device, ireq);
724 /* set the 'terminated' flag handle to make sure it cannot be terminated
725 * or completed again.
726 */
727 set_bit(IREQ_TERMINATED, &ireq->flags);
728
729 if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
730 wake_up_all(&ihost->eventq);
731
732 if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
733 isci_free_tag(ihost, ireq->io_tag);
734
735 /* The task management part completes last. */
736 if (tmf_complete)
737 complete(tmf_complete);
738}
739
740static int isci_reset_device(struct isci_host *ihost,
741 struct domain_device *dev,
742 struct isci_remote_device *idev)
743{
744 int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
745 struct sas_phy *phy = sas_get_local_phy(dev);
746 struct isci_port *iport = dev->port->lldd_port;
747
748 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
749
750 /* Suspend the RNC, terminate all outstanding TCs. */
751 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
752 != SCI_SUCCESS) {
753 rc = TMF_RESP_FUNC_FAILED;
754 goto out;
755 }
756 /* Note that since the termination for outstanding requests succeeded,
757 * this function will return success. This is because the resets will
758 * only fail if the device has been removed (ie. hotplug), and the
759 * primary duty of this function is to cleanup tasks, so that is the
760 * relevant status.
761 */
762 if (!test_bit(IDEV_GONE, &idev->flags)) {
763 if (scsi_is_sas_phy_local(phy)) {
764 struct isci_phy *iphy = &ihost->phys[phy->number];
765
766 reset_stat = isci_port_perform_hard_reset(ihost, iport,
767 iphy);
768 } else
769 reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
770 }
771 /* Explicitly resume the RNC here, since there was no task sent. */
772 isci_remote_device_resume_from_abort(ihost, idev);
773
774 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
775 __func__, idev, reset_stat);
776 out:
777 sas_put_local_phy(phy);
778 return rc;
779}
780
781int isci_task_I_T_nexus_reset(struct domain_device *dev)
782{
783 struct isci_host *ihost = dev_to_ihost(dev);
784 struct isci_remote_device *idev;
785 unsigned long flags;
786 int ret;
787
788 spin_lock_irqsave(&ihost->scic_lock, flags);
789 idev = isci_get_device(dev->lldd_dev);
790 spin_unlock_irqrestore(&ihost->scic_lock, flags);
791
792 if (!idev) {
793 /* XXX: need to cleanup any ireqs targeting this
794 * domain_device
795 */
796 ret = -ENODEV;
797 goto out;
798 }
799
800 ret = isci_reset_device(ihost, dev, idev);
801 out:
802 isci_put_device(idev);
803 return ret;
804}
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 status = sci_task_request_construct_ssp(ireq);
247 if (status != SCI_SUCCESS)
248 return NULL;
249 }
250
251 return ireq;
252}
253
254static int isci_task_execute_tmf(struct isci_host *ihost,
255 struct isci_remote_device *idev,
256 struct isci_tmf *tmf, unsigned long timeout_ms)
257{
258 DECLARE_COMPLETION_ONSTACK(completion);
259 enum sci_status status = SCI_FAILURE;
260 struct isci_request *ireq;
261 int ret = TMF_RESP_FUNC_FAILED;
262 unsigned long flags;
263 unsigned long timeleft;
264 u16 tag;
265
266 spin_lock_irqsave(&ihost->scic_lock, flags);
267 tag = isci_alloc_tag(ihost);
268 spin_unlock_irqrestore(&ihost->scic_lock, flags);
269
270 if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
271 return ret;
272
273 /* sanity check, return TMF_RESP_FUNC_FAILED
274 * if the device is not there and ready.
275 */
276 if (!idev ||
277 (!test_bit(IDEV_IO_READY, &idev->flags) &&
278 !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
279 dev_dbg(&ihost->pdev->dev,
280 "%s: idev = %p not ready (%#lx)\n",
281 __func__,
282 idev, idev ? idev->flags : 0);
283 goto err_tci;
284 } else
285 dev_dbg(&ihost->pdev->dev,
286 "%s: idev = %p\n",
287 __func__, idev);
288
289 /* Assign the pointer to the TMF's completion kernel wait structure. */
290 tmf->complete = &completion;
291 tmf->status = SCI_FAILURE_TIMEOUT;
292
293 ireq = isci_task_request_build(ihost, idev, tag, tmf);
294 if (!ireq)
295 goto err_tci;
296
297 spin_lock_irqsave(&ihost->scic_lock, flags);
298
299 /* start the TMF io. */
300 status = sci_controller_start_task(ihost, idev, ireq);
301
302 if (status != SCI_SUCCESS) {
303 dev_dbg(&ihost->pdev->dev,
304 "%s: start_io failed - status = 0x%x, request = %p\n",
305 __func__,
306 status,
307 ireq);
308 spin_unlock_irqrestore(&ihost->scic_lock, flags);
309 goto err_tci;
310 }
311 spin_unlock_irqrestore(&ihost->scic_lock, flags);
312
313 /* The RNC must be unsuspended before the TMF can get a response. */
314 isci_remote_device_resume_from_abort(ihost, idev);
315
316 /* Wait for the TMF to complete, or a timeout. */
317 timeleft = wait_for_completion_timeout(&completion,
318 msecs_to_jiffies(timeout_ms));
319
320 if (timeleft == 0) {
321 /* The TMF did not complete - this could be because
322 * of an unplug. Terminate the TMF request now.
323 */
324 isci_remote_device_suspend_terminate(ihost, idev, ireq);
325 }
326
327 isci_print_tmf(ihost, tmf);
328
329 if (tmf->status == SCI_SUCCESS)
330 ret = TMF_RESP_FUNC_COMPLETE;
331 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
332 dev_dbg(&ihost->pdev->dev,
333 "%s: tmf.status == "
334 "SCI_FAILURE_IO_RESPONSE_VALID\n",
335 __func__);
336 ret = TMF_RESP_FUNC_COMPLETE;
337 }
338 /* Else - leave the default "failed" status alone. */
339
340 dev_dbg(&ihost->pdev->dev,
341 "%s: completed request = %p\n",
342 __func__,
343 ireq);
344
345 return ret;
346
347 err_tci:
348 spin_lock_irqsave(&ihost->scic_lock, flags);
349 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
350 spin_unlock_irqrestore(&ihost->scic_lock, flags);
351
352 return ret;
353}
354
355static void isci_task_build_tmf(struct isci_tmf *tmf,
356 enum isci_tmf_function_codes code)
357{
358 memset(tmf, 0, sizeof(*tmf));
359 tmf->tmf_code = code;
360}
361
362static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
363 enum isci_tmf_function_codes code,
364 struct isci_request *old_request)
365{
366 isci_task_build_tmf(tmf, code);
367 tmf->io_tag = old_request->io_tag;
368}
369
370/*
371 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
372 * Template functions.
373 * @lun: This parameter specifies the lun to be reset.
374 *
375 * status, zero indicates success.
376 */
377static int isci_task_send_lu_reset_sas(
378 struct isci_host *isci_host,
379 struct isci_remote_device *isci_device,
380 u8 *lun)
381{
382 struct isci_tmf tmf;
383 int ret = TMF_RESP_FUNC_FAILED;
384
385 dev_dbg(&isci_host->pdev->dev,
386 "%s: isci_host = %p, isci_device = %p\n",
387 __func__, isci_host, isci_device);
388 /* Send the LUN reset to the target. By the time the call returns,
389 * the TMF has fully exected in the target (in which case the return
390 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
391 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
392 */
393 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
394
395 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
396 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
397
398 if (ret == TMF_RESP_FUNC_COMPLETE)
399 dev_dbg(&isci_host->pdev->dev,
400 "%s: %p: TMF_LU_RESET passed\n",
401 __func__, isci_device);
402 else
403 dev_dbg(&isci_host->pdev->dev,
404 "%s: %p: TMF_LU_RESET failed (%x)\n",
405 __func__, isci_device, ret);
406
407 return ret;
408}
409
410int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
411{
412 struct isci_host *ihost = dev_to_ihost(dev);
413 struct isci_remote_device *idev;
414 unsigned long flags;
415 int ret = TMF_RESP_FUNC_COMPLETE;
416
417 spin_lock_irqsave(&ihost->scic_lock, flags);
418 idev = isci_get_device(dev->lldd_dev);
419 spin_unlock_irqrestore(&ihost->scic_lock, flags);
420
421 dev_dbg(&ihost->pdev->dev,
422 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
423 __func__, dev, ihost, idev);
424
425 if (!idev) {
426 /* If the device is gone, escalate to I_T_Nexus_Reset. */
427 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
428
429 ret = TMF_RESP_FUNC_FAILED;
430 goto out;
431 }
432
433 /* Suspend the RNC, kill all TCs */
434 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
435 != SCI_SUCCESS) {
436 /* The suspend/terminate only fails if isci_get_device fails */
437 ret = TMF_RESP_FUNC_FAILED;
438 goto out;
439 }
440 /* All pending I/Os have been terminated and cleaned up. */
441 if (!test_bit(IDEV_GONE, &idev->flags)) {
442 if (dev_is_sata(dev))
443 sas_ata_schedule_reset(dev);
444 else
445 /* Send the task management part of the reset. */
446 ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
447 }
448 out:
449 isci_put_device(idev);
450 return ret;
451}
452
453
454/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
455int isci_task_clear_nexus_port(struct asd_sas_port *port)
456{
457 return TMF_RESP_FUNC_FAILED;
458}
459
460
461
462int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
463{
464 return TMF_RESP_FUNC_FAILED;
465}
466
467/* Task Management Functions. Must be called from process context. */
468
469/**
470 * isci_task_abort_task() - This function is one of the SAS Domain Template
471 * functions. This function is called by libsas to abort a specified task.
472 * @task: This parameter specifies the SAS task to abort.
473 *
474 * status, zero indicates success.
475 */
476int isci_task_abort_task(struct sas_task *task)
477{
478 struct isci_host *ihost = dev_to_ihost(task->dev);
479 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
480 struct isci_request *old_request = NULL;
481 struct isci_remote_device *idev = NULL;
482 struct isci_tmf tmf;
483 int ret = TMF_RESP_FUNC_FAILED;
484 unsigned long flags;
485 int target_done_already = 0;
486
487 /* Get the isci_request reference from the task. Note that
488 * this check does not depend on the pending request list
489 * in the device, because tasks driving resets may land here
490 * after completion in the core.
491 */
492 spin_lock_irqsave(&ihost->scic_lock, flags);
493 spin_lock(&task->task_state_lock);
494
495 old_request = task->lldd_task;
496
497 /* If task is already done, the request isn't valid */
498 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
499 old_request) {
500 idev = isci_get_device(task->dev->lldd_dev);
501 target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
502 &old_request->flags);
503 }
504 spin_unlock(&task->task_state_lock);
505 spin_unlock_irqrestore(&ihost->scic_lock, flags);
506
507 dev_warn(&ihost->pdev->dev,
508 "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
509 __func__, idev,
510 (dev_is_sata(task->dev) ? "STP/SATA"
511 : ((dev_is_expander(task->dev->dev_type))
512 ? "SMP"
513 : "SSP")),
514 ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
515 ? " IDEV_GONE"
516 : "")
517 : " <NULL>"),
518 task, old_request);
519
520 /* Device reset conditions signalled in task_state_flags are the
521 * responsbility of libsas to observe at the start of the error
522 * handler thread.
523 */
524 if (!idev || !old_request) {
525 /* The request has already completed and there
526 * is nothing to do here other than to set the task
527 * done bit, and indicate that the task abort function
528 * was successful.
529 */
530 spin_lock_irqsave(&task->task_state_lock, flags);
531 task->task_state_flags |= SAS_TASK_STATE_DONE;
532 task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
533 spin_unlock_irqrestore(&task->task_state_lock, flags);
534
535 ret = TMF_RESP_FUNC_COMPLETE;
536
537 dev_warn(&ihost->pdev->dev,
538 "%s: abort task not needed for %p\n",
539 __func__, task);
540 goto out;
541 }
542 /* Suspend the RNC, kill the TC */
543 if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
544 != SCI_SUCCESS) {
545 dev_warn(&ihost->pdev->dev,
546 "%s: isci_remote_device_reset_terminate(dev=%p, "
547 "req=%p, task=%p) failed\n",
548 __func__, idev, old_request, task);
549 ret = TMF_RESP_FUNC_FAILED;
550 goto out;
551 }
552 spin_lock_irqsave(&ihost->scic_lock, flags);
553
554 if (task->task_proto == SAS_PROTOCOL_SMP ||
555 sas_protocol_ata(task->task_proto) ||
556 target_done_already ||
557 test_bit(IDEV_GONE, &idev->flags)) {
558
559 spin_unlock_irqrestore(&ihost->scic_lock, flags);
560
561 /* No task to send, so explicitly resume the device here */
562 isci_remote_device_resume_from_abort(ihost, idev);
563
564 dev_warn(&ihost->pdev->dev,
565 "%s: %s request"
566 " or complete_in_target (%d), "
567 "or IDEV_GONE (%d), thus no TMF\n",
568 __func__,
569 ((task->task_proto == SAS_PROTOCOL_SMP)
570 ? "SMP"
571 : (sas_protocol_ata(task->task_proto)
572 ? "SATA/STP"
573 : "<other>")
574 ),
575 test_bit(IREQ_COMPLETE_IN_TARGET,
576 &old_request->flags),
577 test_bit(IDEV_GONE, &idev->flags));
578
579 spin_lock_irqsave(&task->task_state_lock, flags);
580 task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
581 task->task_state_flags |= SAS_TASK_STATE_DONE;
582 spin_unlock_irqrestore(&task->task_state_lock, flags);
583
584 ret = TMF_RESP_FUNC_COMPLETE;
585 } else {
586 /* Fill in the tmf structure */
587 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
588 old_request);
589
590 spin_unlock_irqrestore(&ihost->scic_lock, flags);
591
592 /* Send the task management request. */
593 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
594 ret = isci_task_execute_tmf(ihost, idev, &tmf,
595 ISCI_ABORT_TASK_TIMEOUT_MS);
596 }
597out:
598 dev_warn(&ihost->pdev->dev,
599 "%s: Done; dev = %p, task = %p , old_request == %p\n",
600 __func__, idev, task, old_request);
601 isci_put_device(idev);
602 return ret;
603}
604
605/**
606 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
607 * functions. This is one of the Task Management functoins called by libsas,
608 * to abort all task for the given lun.
609 * @d_device: This parameter specifies the domain device associated with this
610 * request.
611 * @lun: This parameter specifies the lun associated with this request.
612 *
613 * status, zero indicates success.
614 */
615int isci_task_abort_task_set(
616 struct domain_device *d_device,
617 u8 *lun)
618{
619 return TMF_RESP_FUNC_FAILED;
620}
621
622
623/**
624 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
625 * functions. This is one of the Task Management functoins called by libsas.
626 * @d_device: This parameter specifies the domain device associated with this
627 * request.
628 * @lun: This parameter specifies the lun associated with this request.
629 *
630 * status, zero indicates success.
631 */
632int isci_task_clear_task_set(
633 struct domain_device *d_device,
634 u8 *lun)
635{
636 return TMF_RESP_FUNC_FAILED;
637}
638
639
640/**
641 * isci_task_query_task() - This function is implemented to cause libsas to
642 * correctly escalate the failed abort to a LUN or target reset (this is
643 * because sas_scsi_find_task libsas function does not correctly interpret
644 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
645 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
646 * returned, libsas will turn this into a target reset
647 * @task: This parameter specifies the sas task being queried.
648 *
649 * status, zero indicates success.
650 */
651int isci_task_query_task(
652 struct sas_task *task)
653{
654 /* See if there is a pending device reset for this device. */
655 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
656 return TMF_RESP_FUNC_FAILED;
657 else
658 return TMF_RESP_FUNC_SUCC;
659}
660
661/*
662 * isci_task_request_complete() - This function is called by the sci core when
663 * an task request completes.
664 * @ihost: This parameter specifies the ISCI host object
665 * @ireq: This parameter is the completed isci_request object.
666 * @completion_status: This parameter specifies the completion status from the
667 * sci core.
668 *
669 * none.
670 */
671void
672isci_task_request_complete(struct isci_host *ihost,
673 struct isci_request *ireq,
674 enum sci_task_status completion_status)
675{
676 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
677 struct completion *tmf_complete = NULL;
678
679 dev_dbg(&ihost->pdev->dev,
680 "%s: request = %p, status=%d\n",
681 __func__, ireq, completion_status);
682
683 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
684
685 if (tmf) {
686 tmf->status = completion_status;
687
688 if (tmf->proto == SAS_PROTOCOL_SSP) {
689 memcpy(tmf->resp.rsp_buf,
690 ireq->ssp.rsp_buf,
691 SSP_RESP_IU_MAX_SIZE);
692 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
693 memcpy(&tmf->resp.d2h_fis,
694 &ireq->stp.rsp,
695 sizeof(struct dev_to_host_fis));
696 }
697 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
698 tmf_complete = tmf->complete;
699 }
700 sci_controller_complete_io(ihost, ireq->target_device, ireq);
701 /* set the 'terminated' flag handle to make sure it cannot be terminated
702 * or completed again.
703 */
704 set_bit(IREQ_TERMINATED, &ireq->flags);
705
706 if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
707 wake_up_all(&ihost->eventq);
708
709 if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
710 isci_free_tag(ihost, ireq->io_tag);
711
712 /* The task management part completes last. */
713 if (tmf_complete)
714 complete(tmf_complete);
715}
716
717static int isci_reset_device(struct isci_host *ihost,
718 struct domain_device *dev,
719 struct isci_remote_device *idev)
720{
721 int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
722 struct sas_phy *phy = sas_get_local_phy(dev);
723 struct isci_port *iport = dev->port->lldd_port;
724
725 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
726
727 /* Suspend the RNC, terminate all outstanding TCs. */
728 if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
729 != SCI_SUCCESS) {
730 rc = TMF_RESP_FUNC_FAILED;
731 goto out;
732 }
733 /* Note that since the termination for outstanding requests succeeded,
734 * this function will return success. This is because the resets will
735 * only fail if the device has been removed (ie. hotplug), and the
736 * primary duty of this function is to cleanup tasks, so that is the
737 * relevant status.
738 */
739 if (!test_bit(IDEV_GONE, &idev->flags)) {
740 if (scsi_is_sas_phy_local(phy)) {
741 struct isci_phy *iphy = &ihost->phys[phy->number];
742
743 reset_stat = isci_port_perform_hard_reset(ihost, iport,
744 iphy);
745 } else
746 reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
747 }
748 /* Explicitly resume the RNC here, since there was no task sent. */
749 isci_remote_device_resume_from_abort(ihost, idev);
750
751 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
752 __func__, idev, reset_stat);
753 out:
754 sas_put_local_phy(phy);
755 return rc;
756}
757
758int isci_task_I_T_nexus_reset(struct domain_device *dev)
759{
760 struct isci_host *ihost = dev_to_ihost(dev);
761 struct isci_remote_device *idev;
762 unsigned long flags;
763 int ret;
764
765 spin_lock_irqsave(&ihost->scic_lock, flags);
766 idev = isci_get_device(dev->lldd_dev);
767 spin_unlock_irqrestore(&ihost->scic_lock, flags);
768
769 if (!idev) {
770 /* XXX: need to cleanup any ireqs targeting this
771 * domain_device
772 */
773 ret = -ENODEV;
774 goto out;
775 }
776
777 ret = isci_reset_device(ihost, dev, idev);
778 out:
779 isci_put_device(idev);
780 return ret;
781}