blob: 98204b031649ea1b2e77a183e71b6da700ee67f0 [file] [log] [blame]
Dan Williams6f231dd2011-07-02 22:56:22 -07001/*
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 "scic_task_request.h"
58#include "scic_remote_device.h"
59#include "scic_io_request.h"
60#include "scic_sds_remote_device.h"
61#include "scic_sds_remote_node_context.h"
62#include "isci.h"
63#include "request.h"
64#include "sata.h"
65#include "task.h"
66
67
68/**
69 * isci_task_execute_task() - This function is one of the SAS Domain Template
70 * functions. This function is called by libsas to send a task down to
71 * hardware.
72 * @task: This parameter specifies the SAS task to send.
73 * @num: This parameter specifies the number of tasks to queue.
74 * @gfp_flags: This parameter specifies the context of this call.
75 *
76 * status, zero indicates success.
77 */
78int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
79{
80 struct isci_host *isci_host;
81 struct isci_request *request = NULL;
82 struct isci_remote_device *device;
83 unsigned long flags;
Dan Williams6f231dd2011-07-02 22:56:22 -070084 int ret;
85 enum sci_status status;
86
87
88 dev_dbg(task->dev->port->ha->dev, "%s: num=%d\n", __func__, num);
89
90 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
91
92 isci_task_complete_for_upper_layer(
93 task,
94 SAS_TASK_UNDELIVERED,
95 SAM_STAT_TASK_ABORTED,
96 isci_perform_normal_io_completion
97 );
98
99 return 0; /* The I/O was accepted (and failed). */
100 }
101 if ((task->dev == NULL) || (task->dev->port == NULL)) {
102
103 /* Indicate SAS_TASK_UNDELIVERED, so that the scsi midlayer
104 * removes the target.
105 */
106 isci_task_complete_for_upper_layer(
107 task,
108 SAS_TASK_UNDELIVERED,
109 SAS_DEVICE_UNKNOWN,
110 isci_perform_normal_io_completion
111 );
112 return 0; /* The I/O was accepted (and failed). */
113 }
114 isci_host = isci_host_from_sas_ha(task->dev->port->ha);
115
116 /* Check if we have room for more tasks */
117 ret = isci_host_can_queue(isci_host, num);
118
119 if (ret) {
120 dev_warn(task->dev->port->ha->dev, "%s: queue full\n", __func__);
121 return ret;
122 }
123
124 do {
125 dev_dbg(task->dev->port->ha->dev,
126 "task = %p, num = %d; dev = %p; cmd = %p\n",
127 task, num, task->dev, task->uldd_task);
128
129 if ((task->dev == NULL) || (task->dev->port == NULL)) {
130 dev_warn(task->dev->port->ha->dev,
131 "%s: task %p's port or dev == NULL!\n",
132 __func__, task);
133
134 /* Indicate SAS_TASK_UNDELIVERED, so that the scsi
135 * midlayer removes the target.
136 */
137 isci_task_complete_for_upper_layer(
138 task,
139 SAS_TASK_UNDELIVERED,
140 SAS_DEVICE_UNKNOWN,
141 isci_perform_normal_io_completion
142 );
143 /* We don't have a valid host reference, so we
144 * can't control the host queueing condition.
145 */
146 continue;
147 }
148
149 device = isci_dev_from_domain_dev(task->dev);
150
151 isci_host = isci_host_from_sas_ha(task->dev->port->ha);
152
Dan Williams8acaec12011-03-07 14:47:35 -0800153 if (device && device->status == isci_ready) {
Dan Williams6f231dd2011-07-02 22:56:22 -0700154
155 /* Forces a retry from scsi mid layer. */
156 dev_warn(task->dev->port->ha->dev,
157 "%s: task %p: isci_host->status = %d, "
158 "device = %p\n",
159 __func__,
160 task,
161 isci_host_get_state(isci_host),
162 device);
163
164 if (device)
165 dev_dbg(task->dev->port->ha->dev,
166 "%s: device->status = 0x%x\n",
Dan Williams8acaec12011-03-07 14:47:35 -0800167 __func__, device->status);
Dan Williams6f231dd2011-07-02 22:56:22 -0700168
169 /* Indicate QUEUE_FULL so that the scsi midlayer
170 * retries.
171 */
172 isci_task_complete_for_upper_layer(
173 task,
174 SAS_TASK_COMPLETE,
175 SAS_QUEUE_FULL,
176 isci_perform_normal_io_completion
177 );
178 isci_host_can_dequeue(isci_host, 1);
179 }
180 /* the device is going down... */
Dan Williams8acaec12011-03-07 14:47:35 -0800181 else if (!device || device->status != isci_ready_for_io) {
Dan Williams6f231dd2011-07-02 22:56:22 -0700182
183 dev_dbg(task->dev->port->ha->dev,
184 "%s: task %p: isci_host->status = %d, "
185 "device = %p\n",
186 __func__,
187 task,
188 isci_host_get_state(isci_host),
189 device);
190
191 if (device)
192 dev_dbg(task->dev->port->ha->dev,
193 "%s: device->status = 0x%x\n",
Dan Williams8acaec12011-03-07 14:47:35 -0800194 __func__, device->status);
Dan Williams6f231dd2011-07-02 22:56:22 -0700195
196 /* Indicate SAS_TASK_UNDELIVERED, so that the scsi
197 * midlayer removes the target.
198 */
199 isci_task_complete_for_upper_layer(
200 task,
201 SAS_TASK_UNDELIVERED,
202 SAS_DEVICE_UNKNOWN,
203 isci_perform_normal_io_completion
204 );
205 isci_host_can_dequeue(isci_host, 1);
206
207 } else {
208 /* build and send the request. */
209 status = isci_request_execute(isci_host, task, &request,
210 gfp_flags);
211
212 if (status == SCI_SUCCESS) {
213 spin_lock_irqsave(&task->task_state_lock, flags);
214 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
215 spin_unlock_irqrestore(&task->task_state_lock, flags);
216 } else {
217 /* Indicate QUEUE_FULL so that the scsi
218 * midlayer retries. if the request
219 * failed for remote device reasons,
220 * it gets returned as
221 * SAS_TASK_UNDELIVERED next time
222 * through.
223 */
224 isci_task_complete_for_upper_layer(
225 task,
226 SAS_TASK_COMPLETE,
227 SAS_QUEUE_FULL,
228 isci_perform_normal_io_completion
229 );
230 isci_host_can_dequeue(isci_host, 1);
231 }
232 }
Dan Williams6f231dd2011-07-02 22:56:22 -0700233 task = list_entry(task->list.next, struct sas_task, list);
234 } while (--num > 0);
235 return 0;
236}
237
238
239
240/**
241 * isci_task_request_build() - This function builds the task request object.
242 * @isci_host: This parameter specifies the ISCI host object
243 * @request: This parameter points to the isci_request object allocated in the
244 * request construct function.
245 * @tmf: This parameter is the task management struct to be built
246 *
247 * SCI_SUCCESS on successfull completion, or specific failure code.
248 */
249static enum sci_status isci_task_request_build(
250 struct isci_host *isci_host,
251 struct isci_request **isci_request,
252 struct isci_tmf *isci_tmf)
253{
254 struct scic_sds_remote_device *sci_device;
255 enum sci_status status = SCI_FAILURE;
256 struct isci_request *request;
257 struct isci_remote_device *isci_device;
258/* struct sci_sas_identify_address_frame_protocols dev_protocols; */
259 struct smp_discover_response_protocols dev_protocols;
260
261
262 dev_dbg(&isci_host->pdev->dev,
263 "%s: isci_tmf = %p\n", __func__, isci_tmf);
264
265 isci_device = isci_tmf->device;
Dan Williams3a97eec2011-03-04 11:51:43 -0800266 sci_device = to_sci_dev(isci_device);
Dan Williams6f231dd2011-07-02 22:56:22 -0700267
268 /* do common allocation and init of request object. */
269 status = isci_request_alloc_tmf(
270 isci_host,
271 isci_tmf,
272 &request,
273 isci_device,
274 GFP_ATOMIC
275 );
276
277 if (status != SCI_SUCCESS)
278 goto out;
279
280 /* let the core do it's construct. */
281 status = scic_task_request_construct(
282 isci_host->core_controller,
283 sci_device,
284 SCI_CONTROLLER_INVALID_IO_TAG,
285 request,
286 request->sci_request_mem_ptr,
287 &request->sci_request_handle
288 );
289
290 if (status != SCI_SUCCESS) {
291 dev_warn(&isci_host->pdev->dev,
292 "%s: scic_task_request_construct failed - "
293 "status = 0x%x\n",
294 __func__,
295 status);
296 goto errout;
297 }
298
299 sci_object_set_association(
300 request->sci_request_handle,
301 request
302 );
303
304 scic_remote_device_get_protocols(
305 sci_device,
306 &dev_protocols
307 );
308
309 /* let the core do it's protocol
310 * specific construction.
311 */
312 if (dev_protocols.u.bits.attached_ssp_target) {
313
314 isci_tmf->proto = SAS_PROTOCOL_SSP;
315 status = scic_task_request_construct_ssp(
316 request->sci_request_handle
317 );
318 if (status != SCI_SUCCESS)
319 goto errout;
320 }
321
322 if (dev_protocols.u.bits.attached_stp_target) {
323
324 isci_tmf->proto = SAS_PROTOCOL_SATA;
325 status = isci_sata_management_task_request_build(request);
326
327 if (status != SCI_SUCCESS)
328 goto errout;
329 }
330
331 goto out;
332
333 errout:
334
335 /* release the dma memory if we fail. */
336 isci_request_free(isci_host, request);
337 request = NULL;
338
339 out:
340 *isci_request = request;
341 return status;
342}
343
344/**
345 * isci_tmf_timeout_cb() - This function is called as a kernel callback when
346 * the timeout period for the TMF has expired.
347 *
348 *
349 */
350static void isci_tmf_timeout_cb(void *tmf_request_arg)
351{
352 struct isci_request *request = (struct isci_request *)tmf_request_arg;
353 struct isci_tmf *tmf = isci_request_access_tmf(request);
354 enum sci_status status;
355
356 BUG_ON(request->ttype != tmf_task);
357
358 /* This task management request has timed-out. Terminate the request
359 * so that the request eventually completes to the requestor in the
360 * request completion callback path.
361 */
362 /* Note - the timer callback function itself has provided spinlock
363 * exclusion from the start and completion paths. No need to take
364 * the request->isci_host->scic_lock here.
365 */
366
367 if (tmf->timeout_timer != NULL) {
368 /* Call the users callback, if any. */
369 if (tmf->cb_state_func != NULL)
370 tmf->cb_state_func(isci_tmf_timed_out, tmf,
371 tmf->cb_data);
372
373 /* Terminate the TMF transmit request. */
374 status = scic_controller_terminate_request(
375 request->isci_host->core_controller,
Dan Williams3a97eec2011-03-04 11:51:43 -0800376 to_sci_dev(request->isci_device),
Dan Williams6f231dd2011-07-02 22:56:22 -0700377 request->sci_request_handle
378 );
379
380 dev_dbg(&request->isci_host->pdev->dev,
381 "%s: tmf_request = %p; tmf = %p; status = %d\n",
382 __func__, request, tmf, status);
383 } else
384 dev_dbg(&request->isci_host->pdev->dev,
385 "%s: timer already canceled! "
386 "tmf_request = %p; tmf = %p\n",
387 __func__, request, tmf);
388
389 /* No need to unlock since the caller to this callback is doing it for
390 * us.
391 * request->isci_host->scic_lock
392 */
393}
394
395/**
396 * isci_task_execute_tmf() - This function builds and sends a task request,
397 * then waits for the completion.
398 * @isci_host: This parameter specifies the ISCI host object
399 * @tmf: This parameter is the pointer to the task management structure for
400 * this request.
401 * @timeout_ms: This parameter specifies the timeout period for the task
402 * management request.
403 *
404 * TMF_RESP_FUNC_COMPLETE on successful completion of the TMF (this includes
405 * error conditions reported in the IU status), or TMF_RESP_FUNC_FAILED.
406 */
407int isci_task_execute_tmf(
408 struct isci_host *isci_host,
409 struct isci_tmf *tmf,
410 unsigned long timeout_ms)
411{
412 DECLARE_COMPLETION_ONSTACK(completion);
413 enum sci_status status = SCI_FAILURE;
414 struct scic_sds_remote_device *sci_device;
415 struct isci_remote_device *isci_device = tmf->device;
416 struct isci_request *request;
417 int ret = TMF_RESP_FUNC_FAILED;
418 unsigned long flags;
419
420 /* sanity check, return TMF_RESP_FUNC_FAILED
421 * if the device is not there and ready.
422 */
Dan Williams8acaec12011-03-07 14:47:35 -0800423 if (!isci_device || isci_device->status != isci_ready_for_io) {
Dan Williams6f231dd2011-07-02 22:56:22 -0700424 dev_dbg(&isci_host->pdev->dev,
425 "%s: isci_device = %p not ready (%d)\n",
426 __func__,
Dan Williams8acaec12011-03-07 14:47:35 -0800427 isci_device, isci_device->status);
Dan Williams6f231dd2011-07-02 22:56:22 -0700428 return TMF_RESP_FUNC_FAILED;
429 } else
430 dev_dbg(&isci_host->pdev->dev,
431 "%s: isci_device = %p\n",
432 __func__, isci_device);
433
Dan Williams3a97eec2011-03-04 11:51:43 -0800434 sci_device = to_sci_dev(isci_device);
Dan Williams6f231dd2011-07-02 22:56:22 -0700435
436 /* Assign the pointer to the TMF's completion kernel wait structure. */
437 tmf->complete = &completion;
438
439 isci_task_request_build(
440 isci_host,
441 &request,
442 tmf
443 );
444
445 if (!request) {
446 dev_warn(&isci_host->pdev->dev,
447 "%s: isci_task_request_build failed\n",
448 __func__);
449 return TMF_RESP_FUNC_FAILED;
450 }
451
452 /* Allocate the TMF timeout timer. */
Dan Williams6f231dd2011-07-02 22:56:22 -0700453 spin_lock_irqsave(&isci_host->scic_lock, flags);
Dan Williams7c40a802011-03-02 11:49:26 -0800454 tmf->timeout_timer = isci_timer_create(isci_host, request, isci_tmf_timeout_cb);
Dan Williams6f231dd2011-07-02 22:56:22 -0700455
456 /* Start the timer. */
457 if (tmf->timeout_timer)
458 isci_timer_start(tmf->timeout_timer, timeout_ms);
459 else
460 dev_warn(&isci_host->pdev->dev,
461 "%s: isci_timer_create failed!!!!\n",
462 __func__);
463
464 /* start the TMF io. */
465 status = scic_controller_start_task(
466 isci_host->core_controller,
467 sci_device,
468 request->sci_request_handle,
469 SCI_CONTROLLER_INVALID_IO_TAG
470 );
471
472 if (status != SCI_SUCCESS) {
473 dev_warn(&isci_host->pdev->dev,
474 "%s: start_io failed - status = 0x%x, request = %p\n",
475 __func__,
476 status,
477 request);
478 goto cleanup_request;
479 }
480
481 /* Call the users callback, if any. */
482 if (tmf->cb_state_func != NULL)
483 tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
484
485 /* Change the state of the TMF-bearing request to "started". */
486 isci_request_change_state(request, started);
487
488 /* add the request to the remote device request list. */
489 list_add(&request->dev_node, &isci_device->reqs_in_process);
490
491 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
492
493 /* Wait for the TMF to complete, or a timeout. */
494 wait_for_completion(&completion);
495
496 isci_print_tmf(tmf);
497
498 if (tmf->status == SCI_SUCCESS)
499 ret = TMF_RESP_FUNC_COMPLETE;
500 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
501 dev_dbg(&isci_host->pdev->dev,
502 "%s: tmf.status == "
503 "SCI_FAILURE_IO_RESPONSE_VALID\n",
504 __func__);
505 ret = TMF_RESP_FUNC_COMPLETE;
506 }
507 /* Else - leave the default "failed" status alone. */
508
509 dev_dbg(&isci_host->pdev->dev,
510 "%s: completed request = %p\n",
511 __func__,
512 request);
513
514 if (request->io_request_completion != NULL) {
515
516 /* The fact that this is non-NULL for a TMF request
517 * means there is a thread waiting for this TMF to
518 * finish.
519 */
520 complete(request->io_request_completion);
521 }
522
523 spin_lock_irqsave(&isci_host->scic_lock, flags);
524
525 cleanup_request:
526
527 /* Clean up the timer if needed. */
528 if (tmf->timeout_timer) {
Dan Williams7c40a802011-03-02 11:49:26 -0800529 isci_del_timer(isci_host, tmf->timeout_timer);
Dan Williams6f231dd2011-07-02 22:56:22 -0700530 tmf->timeout_timer = NULL;
531 }
532
533 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
534
535 isci_request_free(isci_host, request);
536
537 return ret;
538}
539
540void isci_task_build_tmf(
541 struct isci_tmf *tmf,
542 struct isci_remote_device *isci_device,
543 enum isci_tmf_function_codes code,
544 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
545 struct isci_tmf *,
546 void *),
547 void *cb_data)
548{
549 dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
550 "%s: isci_device = %p\n", __func__, isci_device);
551
552 memset(tmf, 0, sizeof(*tmf));
553
554 tmf->device = isci_device;
555 tmf->tmf_code = code;
556 tmf->timeout_timer = NULL;
557 tmf->cb_state_func = tmf_sent_cb;
558 tmf->cb_data = cb_data;
559}
560
561static struct isci_request *isci_task_get_request_from_task(
562 struct sas_task *task,
563 struct isci_host **isci_host,
564 struct isci_remote_device **isci_device)
565{
566
567 struct isci_request *request = NULL;
568 unsigned long flags;
569
570 spin_lock_irqsave(&task->task_state_lock, flags);
571
572 request = task->lldd_task;
573
574 /* If task is already done, the request isn't valid */
575 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
576 (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
577 (request != NULL)) {
578
579 if (isci_host != NULL)
580 *isci_host = request->isci_host;
581
582 if (isci_device != NULL)
583 *isci_device = request->isci_device;
584 }
585
586 spin_unlock_irqrestore(&task->task_state_lock, flags);
587
588 return request;
589}
590
591/**
592 * isci_task_validate_request_to_abort() - This function checks the given I/O
593 * against the "started" state. If the request is still "started", it's
594 * state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
595 * BEFORE CALLING THIS FUNCTION.
596 * @isci_request: This parameter specifies the request object to control.
597 * @isci_host: This parameter specifies the ISCI host object
598 * @isci_device: This is the device to which the request is pending.
599 * @aborted_io_completion: This is a completion structure that will be added to
600 * the request in case it is changed to aborting; this completion is
601 * triggered when the request is fully completed.
602 *
603 * Either "started" on successful change of the task status to "aborted", or
604 * "unallocated" if the task cannot be controlled.
605 */
606static enum isci_request_status isci_task_validate_request_to_abort(
607 struct isci_request *isci_request,
608 struct isci_host *isci_host,
609 struct isci_remote_device *isci_device,
610 struct completion *aborted_io_completion)
611{
612 enum isci_request_status old_state = unallocated;
613
614 /* Only abort the task if it's in the
615 * device's request_in_process list
616 */
617 if (isci_request && !list_empty(&isci_request->dev_node)) {
618 old_state = isci_request_change_started_to_aborted(
619 isci_request, aborted_io_completion);
620
621 /* Only abort requests in the started state. */
622 if (old_state != started)
623 old_state = unallocated;
624 }
625
626 return old_state;
627}
628
629static void isci_request_cleanup_completed_loiterer(
630 struct isci_host *isci_host,
631 struct isci_remote_device *isci_device,
632 struct isci_request *isci_request)
633{
634 struct sas_task *task = isci_request_access_task(isci_request);
635 unsigned long flags;
636
637 dev_dbg(&isci_host->pdev->dev,
638 "%s: isci_device=%p, request=%p, task=%p\n",
639 __func__, isci_device, isci_request,
640 isci_request->ttype_ptr.io_task_ptr);
641
642 spin_lock_irqsave(&isci_host->scic_lock, flags);
643 list_del_init(&isci_request->dev_node);
644 if (task != NULL)
645 task->lldd_task = NULL;
646 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
647
648 isci_request_free(isci_host, isci_request);
649}
650/**
651 * isci_terminate_request_core() - This function will terminate the given
652 * request, and wait for it to complete. This function must only be called
653 * from a thread that can wait. Note that the request is terminated and
654 * completed (back to the host, if started there).
655 * @isci_host: This SCU.
656 * @isci_device: The target.
657 * @isci_request: The I/O request to be terminated.
658 *
659 *
660 */
661static void isci_terminate_request_core(
662 struct isci_host *isci_host,
663 struct isci_remote_device *isci_device,
664 struct isci_request *isci_request,
665 struct completion *request_completion)
666{
667 enum sci_status status = SCI_SUCCESS;
668 bool was_terminated = false;
669 bool needs_cleanup_handling = false;
670 enum isci_request_status request_status;
671 unsigned long flags;
672
673 dev_dbg(&isci_host->pdev->dev,
674 "%s: device = %p; request = %p\n",
675 __func__, isci_device, isci_request);
676
677 /* Peek at the current status of the request. This will tell
678 * us if there was special handling on the request such that it
679 * needs to be detached and freed here.
680 */
681 spin_lock_irqsave(&isci_request->state_lock, flags);
682 request_status = isci_request_get_state(isci_request);
683
684 /* TMFs are in their own thread */
685 if ((isci_request->ttype == io_task) &&
686 ((request_status == aborted) ||
687 (request_status == aborting) ||
688 (request_status == terminating)))
689 /* The completion routine won't free a request in
690 * the aborted/aborting/terminating state, so we do
691 * it here.
692 */
693 needs_cleanup_handling = true;
694
695 spin_unlock_irqrestore(&isci_request->state_lock, flags);
696
697 spin_lock_irqsave(&isci_host->scic_lock, flags);
698 /* Make sure the request wasn't just sitting around signalling
699 * device condition (if the request handle is NULL, then the
700 * request completed but needed additional handling here).
701 */
702 if (isci_request->sci_request_handle != NULL) {
703 was_terminated = true;
704 status = scic_controller_terminate_request(
705 isci_host->core_controller,
Dan Williams3a97eec2011-03-04 11:51:43 -0800706 to_sci_dev(isci_device),
Dan Williams6f231dd2011-07-02 22:56:22 -0700707 isci_request->sci_request_handle
708 );
709 }
710 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
711
712 /*
713 * The only time the request to terminate will
714 * fail is when the io request is completed and
715 * being aborted.
716 */
717 if (status != SCI_SUCCESS)
718 dev_err(&isci_host->pdev->dev,
719 "%s: scic_controller_terminate_request"
720 " returned = 0x%x\n",
721 __func__,
722 status);
723 else {
724 if (was_terminated) {
725 dev_dbg(&isci_host->pdev->dev,
726 "%s: before completion wait (%p)\n",
727 __func__,
728 request_completion);
729
730 /* Wait here for the request to complete. */
731 wait_for_completion(request_completion);
732
733 dev_dbg(&isci_host->pdev->dev,
734 "%s: after completion wait (%p)\n",
735 __func__,
736 request_completion);
737 }
738
739 if (needs_cleanup_handling)
740 isci_request_cleanup_completed_loiterer(
741 isci_host, isci_device, isci_request
742 );
743 }
744}
745static void isci_terminate_request(
746 struct isci_host *isci_host,
747 struct isci_remote_device *isci_device,
748 struct isci_request *isci_request,
749 enum isci_request_status new_request_state)
750{
751 enum isci_request_status old_state;
752
753 DECLARE_COMPLETION_ONSTACK(request_completion);
754 unsigned long flags;
755
756 spin_lock_irqsave(&isci_host->scic_lock, flags);
757
758 /* Change state to "new_request_state" if it is currently "started" */
759 old_state = isci_request_change_started_to_newstate(
760 isci_request,
761 &request_completion,
762 new_request_state
763 );
764
765 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
766
767 if (old_state == started)
768 /* This request was not already being aborted. If it had been,
769 * then the aborting I/O (ie. the TMF request) would not be in
770 * the aborting state, and thus would be terminated here. Note
771 * that since the TMF completion's call to the kernel function
772 * "complete()" does not happen until the pending I/O request
773 * terminate fully completes, we do not have to implement a
774 * special wait here for already aborting requests - the
775 * termination of the TMF request will force the request
776 * to finish it's already started terminate.
777 */
778 isci_terminate_request_core(isci_host, isci_device,
779 isci_request, &request_completion);
780}
781
782/**
783 * isci_terminate_pending_requests() - This function will change the all of the
784 * requests on the given device's state to "aborting", will terminate the
785 * requests, and wait for them to complete. This function must only be
786 * called from a thread that can wait. Note that the requests are all
787 * terminated and completed (back to the host, if started there).
788 * @isci_host: This parameter specifies SCU.
789 * @isci_device: This parameter specifies the target.
790 *
791 *
792 */
793void isci_terminate_pending_requests(
794 struct isci_host *isci_host,
795 struct isci_remote_device *isci_device,
796 enum isci_request_status new_request_state)
797{
798 struct isci_request *isci_request;
799 struct sas_task *task;
800 bool done = false;
801 unsigned long flags;
802
803 dev_dbg(&isci_host->pdev->dev,
804 "%s: isci_device = %p (new request state = %d)\n",
805 __func__, isci_device, new_request_state);
806
807 #define ISCI_TERMINATE_SHOW_PENDING_REQUESTS
808 #ifdef ISCI_TERMINATE_SHOW_PENDING_REQUESTS
809 {
810 struct isci_request *request;
811
812 /* Only abort the task if it's in the
813 * device's request_in_process list
814 */
815 list_for_each_entry(request,
816 &isci_device->reqs_in_process,
817 dev_node)
818 dev_dbg(&isci_host->pdev->dev,
819 "%s: isci_device = %p; request is on "
820 "reqs_in_process list: %p\n",
821 __func__, isci_device, request);
822 }
823 #endif /* ISCI_TERMINATE_SHOW_PENDING_REQUESTS */
824
825 /* Clean up all pending requests. */
826 do {
827 spin_lock_irqsave(&isci_host->scic_lock, flags);
828
829 if (list_empty(&isci_device->reqs_in_process)) {
830
831 done = true;
832 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
833
834 dev_dbg(&isci_host->pdev->dev,
835 "%s: isci_device = %p; done.\n",
836 __func__, isci_device);
837 } else {
838 /* The list was not empty - grab the first request. */
839 isci_request = list_first_entry(
840 &isci_device->reqs_in_process,
841 struct isci_request, dev_node
842 );
843 /* Note that we are not expecting to have to control
844 * the target to abort the request.
845 */
846 isci_request->complete_in_target = true;
847
848 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
849
850 /* Get the libsas task reference. */
851 task = isci_request_access_task(isci_request);
852
853 dev_dbg(&isci_host->pdev->dev,
854 "%s: isci_device=%p request=%p; task=%p\n",
855 __func__, isci_device, isci_request, task);
856
857 /* Mark all still pending I/O with the selected next
858 * state.
859 */
860 isci_terminate_request(isci_host, isci_device,
861 isci_request, new_request_state
862 );
863
864 /* Set the 'done' state on the task. */
865 if (task)
866 isci_task_all_done(task);
867 }
868 } while (!done);
869}
870
871/**
872 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
873 * Template functions.
874 * @lun: This parameter specifies the lun to be reset.
875 *
876 * status, zero indicates success.
877 */
878static int isci_task_send_lu_reset_sas(
879 struct isci_host *isci_host,
880 struct isci_remote_device *isci_device,
881 u8 *lun)
882{
883 struct isci_tmf tmf;
884 int ret = TMF_RESP_FUNC_FAILED;
885
886 dev_dbg(&isci_host->pdev->dev,
887 "%s: isci_host = %p, isci_device = %p\n",
888 __func__, isci_host, isci_device);
889 /* Send the LUN reset to the target. By the time the call returns,
890 * the TMF has fully exected in the target (in which case the return
891 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
892 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
893 */
894 isci_task_build_tmf(&tmf, isci_device, isci_tmf_ssp_lun_reset, NULL,
895 NULL);
896
897 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
898 ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
899
900 if (ret == TMF_RESP_FUNC_COMPLETE)
901 dev_dbg(&isci_host->pdev->dev,
902 "%s: %p: TMF_LU_RESET passed\n",
903 __func__, isci_device);
904 else
905 dev_dbg(&isci_host->pdev->dev,
906 "%s: %p: TMF_LU_RESET failed (%x)\n",
907 __func__, isci_device, ret);
908
909 return ret;
910}
911
912/**
913 * isci_task_lu_reset() - This function is one of the SAS Domain Template
914 * functions. This is one of the Task Management functoins called by libsas,
915 * to reset the given lun. Note the assumption that while this call is
916 * executing, no I/O will be sent by the host to the device.
917 * @lun: This parameter specifies the lun to be reset.
918 *
919 * status, zero indicates success.
920 */
921int isci_task_lu_reset(
922 struct domain_device *domain_device,
923 u8 *lun)
924{
925 struct isci_host *isci_host = NULL;
926 struct isci_remote_device *isci_device = NULL;
927 int ret;
928 bool device_stopping = false;
929
930 if (domain_device == NULL) {
931 pr_warn("%s: domain_device == NULL\n", __func__);
932 return TMF_RESP_FUNC_FAILED;
933 }
934
935 isci_device = isci_dev_from_domain_dev(domain_device);
936
937 if (domain_device->port != NULL)
938 isci_host = isci_host_from_sas_ha(domain_device->port->ha);
939
940 pr_debug("%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
941 __func__, domain_device, isci_host, isci_device);
942
943 if (isci_device != NULL)
944 device_stopping = (isci_device->status == isci_stopping)
945 || (isci_device->status == isci_stopped);
946
947 /* If there is a device reset pending on any request in the
948 * device's list, fail this LUN reset request in order to
949 * escalate to the device reset.
950 */
951 if ((isci_device == NULL) ||
952 (isci_host == NULL) ||
953 ((isci_host != NULL) &&
954 (isci_device != NULL) &&
955 (device_stopping ||
956 (isci_device_is_reset_pending(isci_host, isci_device))))) {
957 dev_warn(&isci_host->pdev->dev,
958 "%s: No dev (%p), no host (%p), or "
959 "RESET PENDING: domain_device=%p\n",
960 __func__, isci_device, isci_host, domain_device);
961 return TMF_RESP_FUNC_FAILED;
962 }
963
Dan Williams6f231dd2011-07-02 22:56:22 -0700964 /* Send the task management part of the reset. */
965 if (sas_protocol_ata(domain_device->tproto)) {
966 ret = isci_task_send_lu_reset_sata(
967 isci_host, isci_device, lun
968 );
969 } else
970 ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
971
972 /* If the LUN reset worked, all the I/O can now be terminated. */
973 if (ret == TMF_RESP_FUNC_COMPLETE)
974 /* Terminate all I/O now. */
975 isci_terminate_pending_requests(isci_host,
976 isci_device,
977 terminating);
978
Dan Williams6f231dd2011-07-02 22:56:22 -0700979 return ret;
980}
981
982
983/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
984int isci_task_clear_nexus_port(struct asd_sas_port *port)
985{
986 return TMF_RESP_FUNC_FAILED;
987}
988
989
990
991int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
992{
993 return TMF_RESP_FUNC_FAILED;
994}
995
996int isci_task_I_T_nexus_reset(struct domain_device *dev)
997{
998 return TMF_RESP_FUNC_FAILED;
999}
1000
1001
1002/* Task Management Functions. Must be called from process context. */
1003
1004/**
1005 * isci_abort_task_process_cb() - This is a helper function for the abort task
1006 * TMF command. It manages the request state with respect to the successful
1007 * transmission / completion of the abort task request.
1008 * @cb_state: This parameter specifies when this function was called - after
1009 * the TMF request has been started and after it has timed-out.
1010 * @tmf: This parameter specifies the TMF in progress.
1011 *
1012 *
1013 */
1014static void isci_abort_task_process_cb(
1015 enum isci_tmf_cb_state cb_state,
1016 struct isci_tmf *tmf,
1017 void *cb_data)
1018{
1019 struct isci_request *old_request;
1020
1021 old_request = (struct isci_request *)cb_data;
1022
1023 dev_dbg(&old_request->isci_host->pdev->dev,
1024 "%s: tmf=%p, old_request=%p\n",
1025 __func__, tmf, old_request);
1026
1027 switch (cb_state) {
1028
1029 case isci_tmf_started:
1030 /* The TMF has been started. Nothing to do here, since the
1031 * request state was already set to "aborted" by the abort
1032 * task function.
1033 */
1034 BUG_ON(old_request->status != aborted);
1035 break;
1036
1037 case isci_tmf_timed_out:
1038
1039 /* Set the task's state to "aborting", since the abort task
1040 * function thread set it to "aborted" (above) in anticipation
1041 * of the task management request working correctly. Since the
1042 * timeout has now fired, the TMF request failed. We set the
1043 * state such that the request completion will indicate the
1044 * device is no longer present.
1045 */
1046 isci_request_change_state(old_request, aborting);
1047 break;
1048
1049 default:
1050 dev_err(&old_request->isci_host->pdev->dev,
1051 "%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
1052 __func__, cb_state, tmf, old_request);
1053 break;
1054 }
1055}
1056
1057/**
1058 * isci_task_abort_task() - This function is one of the SAS Domain Template
1059 * functions. This function is called by libsas to abort a specified task.
1060 * @task: This parameter specifies the SAS task to abort.
1061 *
1062 * status, zero indicates success.
1063 */
1064int isci_task_abort_task(struct sas_task *task)
1065{
1066 DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
1067 struct isci_request *old_request = NULL;
1068 struct isci_remote_device *isci_device = NULL;
1069 struct isci_host *isci_host = NULL;
1070 struct isci_tmf tmf;
1071 int ret = TMF_RESP_FUNC_FAILED;
1072 unsigned long flags;
1073 bool any_dev_reset, device_stopping;
1074
1075 /* Get the isci_request reference from the task. Note that
1076 * this check does not depend on the pending request list
1077 * in the device, because tasks driving resets may land here
1078 * after completion in the core.
1079 */
1080 old_request = isci_task_get_request_from_task(task, &isci_host,
1081 &isci_device);
1082
1083 dev_dbg(&isci_host->pdev->dev,
1084 "%s: task = %p\n", __func__, task);
1085
1086 /* Check if the device has been / is currently being removed.
1087 * If so, no task management will be done, and the I/O will
1088 * be terminated.
1089 */
1090 device_stopping = (isci_device->status == isci_stopping)
1091 || (isci_device->status == isci_stopped);
1092
1093#ifdef NOMORE
1094 /* This abort task function is the first stop of the libsas error
1095 * handler thread. Since libsas is executing in a thread with a
1096 * referernce to the "task" parameter, that task cannot be completed
1097 * directly back to the upper layers. In order to make sure that
1098 * the task is managed correctly if this abort task fails, set the
1099 * "SAS_TASK_STATE_ABORTED" bit now such that completions up the
1100 * stack will be intercepted and only allowed to happen in the
1101 * libsas SCSI error handler thread.
1102 */
1103 spin_lock_irqsave(&task->task_state_lock, flags);
1104 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1105 spin_unlock_irqrestore(&task->task_state_lock, flags);
1106#endif /* NOMORE */
1107
1108 /* This version of the driver will fail abort requests for
1109 * SATA/STP. Failing the abort request this way will cause the
1110 * SCSI error handler thread to escalate to LUN reset
1111 */
1112 if (sas_protocol_ata(task->task_proto) && !device_stopping) {
1113 dev_warn(&isci_host->pdev->dev,
1114 " task %p is for a STP/SATA device;"
1115 " returning TMF_RESP_FUNC_FAILED\n"
1116 " to cause a LUN reset...\n", task);
1117 return TMF_RESP_FUNC_FAILED;
1118 }
1119
1120 dev_dbg(&isci_host->pdev->dev,
1121 "%s: old_request == %p\n", __func__, old_request);
1122
1123 spin_lock_irqsave(&task->task_state_lock, flags);
1124
1125 /* Don't do resets to stopping devices. */
1126 if (device_stopping)
1127 task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
1128
1129 /* See if there is a pending device reset for this device. */
1130 any_dev_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
1131
1132 spin_unlock_irqrestore(&task->task_state_lock, flags);
1133
1134 if ((isci_device != NULL) && !device_stopping)
1135 any_dev_reset = any_dev_reset
1136 || isci_device_is_reset_pending(isci_host,
1137 isci_device
1138 );
1139
1140 /* If the extraction of the request reference from the task
1141 * failed, then the request has been completed (or if there is a
1142 * pending reset then this abort request function must be failed
1143 * in order to escalate to the target reset).
1144 */
1145 if ((old_request == NULL) ||
1146 ((old_request != NULL) &&
1147 (old_request->sci_request_handle == NULL) &&
1148 (old_request->complete_in_target)) ||
1149 any_dev_reset) {
1150
1151 spin_lock_irqsave(&task->task_state_lock, flags);
1152
1153 /* If the device reset task flag is set, fail the task
1154 * management request. Otherwise, the original request
1155 * has completed.
1156 */
1157 if (any_dev_reset) {
1158
1159 /* Turn off the task's DONE to make sure this
1160 * task is escalated to a target reset.
1161 */
1162 task->task_state_flags &= ~SAS_TASK_STATE_DONE;
1163
1164 /* Fail the task management request in order to
1165 * escalate to the target reset.
1166 */
1167 ret = TMF_RESP_FUNC_FAILED;
1168
1169 dev_dbg(&isci_host->pdev->dev,
1170 "%s: Failing task abort in order to "
1171 "escalate to target reset because\n"
1172 "SAS_TASK_NEED_DEV_RESET is set for "
1173 "task %p on dev %p\n",
1174 __func__, task, isci_device);
1175
1176 } else {
1177 ret = TMF_RESP_FUNC_COMPLETE;
1178
1179 dev_dbg(&isci_host->pdev->dev,
1180 "%s: abort task not needed for %p\n",
1181 __func__, task);
1182
1183 /* The request has already completed and there
1184 * is nothing to do here other than to set the task
1185 * done bit, and indicate that the task abort function
1186 * was sucessful.
1187 */
1188 isci_set_task_doneflags(task);
1189
1190 /* Set the abort bit to make sure that libsas sticks the
1191 * task in the completed task queue.
1192 */
1193/* task->task_state_flags |= SAS_TASK_STATE_ABORTED; */
1194
1195 /* Check for the situation where the request was
1196 * left around on the device list but the
1197 * request already completed.
1198 */
1199 if (old_request && !old_request->sci_request_handle) {
1200
1201 isci_request_cleanup_completed_loiterer(
1202 isci_host, isci_device, old_request
1203 );
1204 }
1205 }
1206 spin_unlock_irqrestore(&task->task_state_lock, flags);
1207
1208 return ret;
1209 }
1210
1211 spin_lock_irqsave(&isci_host->scic_lock, flags);
1212
1213 /* Sanity check the request status, and set the I/O kernel completion
1214 * struct that will be triggered when the request completes.
1215 */
1216 if (isci_task_validate_request_to_abort(
1217 old_request,
1218 isci_host,
1219 isci_device,
1220 &aborted_io_completion)
1221 == unallocated) {
1222 dev_dbg(&isci_host->pdev->dev,
1223 "%s: old_request not valid for device = %p\n",
1224 __func__,
1225 isci_device);
1226 old_request = NULL;
1227 }
1228
1229 if (!old_request) {
1230
1231 /* There is no isci_request attached to the sas_task.
1232 * It must have been completed and detached.
1233 */
1234 dev_dbg(&isci_host->pdev->dev,
1235 "%s: old_request == NULL\n",
1236 __func__);
1237
1238 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1239
1240 /* Set the state on the task. */
1241 isci_task_all_done(task);
1242
1243 return TMF_RESP_FUNC_COMPLETE;
1244 }
1245 if (task->task_proto == SAS_PROTOCOL_SMP || device_stopping) {
1246
1247 if (device_stopping)
1248 dev_dbg(&isci_host->pdev->dev,
1249 "%s: device is stopping, thus no TMF\n",
1250 __func__);
1251 else
1252 dev_dbg(&isci_host->pdev->dev,
1253 "%s: request is SMP, thus no TMF\n",
1254 __func__);
1255
1256 old_request->complete_in_target = true;
1257
1258 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1259
1260 /* Set the state on the task. */
1261 isci_task_all_done(task);
1262
1263 ret = TMF_RESP_FUNC_COMPLETE;
1264
1265 /* Stopping and SMP devices are not sent a TMF, and are not
1266 * reset, but the outstanding I/O request is terminated here.
1267 *
1268 * Clean up the request on our side, and wait for the aborted
1269 * I/O to complete.
1270 */
1271 isci_terminate_request_core(isci_host, isci_device, old_request,
1272 &aborted_io_completion);
1273 } else {
1274 /* Fill in the tmf stucture */
1275 isci_task_build_tmf(&tmf, isci_device, isci_tmf_ssp_task_abort,
1276 isci_abort_task_process_cb, old_request);
1277
1278 tmf.io_tag = scic_io_request_get_io_tag(
1279 old_request->sci_request_handle
1280 );
1281
1282 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1283
1284 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* half second timeout. */
1285 ret = isci_task_execute_tmf(isci_host, &tmf,
1286 ISCI_ABORT_TASK_TIMEOUT_MS);
1287
1288 if (ret == TMF_RESP_FUNC_COMPLETE) {
1289 old_request->complete_in_target = true;
1290
1291 /* Clean up the request on our side, and wait for the aborted I/O to
1292 * complete.
1293 */
1294 isci_terminate_request_core(isci_host, isci_device, old_request,
1295 &aborted_io_completion);
1296
1297 /* Set the state on the task. */
1298 isci_task_all_done(task);
1299 } else
1300 dev_err(&isci_host->pdev->dev,
1301 "%s: isci_task_send_tmf failed\n",
1302 __func__);
1303 }
1304
1305 return ret;
1306}
1307
1308/**
1309 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
1310 * functions. This is one of the Task Management functoins called by libsas,
1311 * to abort all task for the given lun.
1312 * @d_device: This parameter specifies the domain device associated with this
1313 * request.
1314 * @lun: This parameter specifies the lun associated with this request.
1315 *
1316 * status, zero indicates success.
1317 */
1318int isci_task_abort_task_set(
1319 struct domain_device *d_device,
1320 u8 *lun)
1321{
1322 return TMF_RESP_FUNC_FAILED;
1323}
1324
1325
1326/**
1327 * isci_task_clear_aca() - This function is one of the SAS Domain Template
1328 * functions. This is one of the Task Management functoins called by libsas.
1329 * @d_device: This parameter specifies the domain device associated with this
1330 * request.
1331 * @lun: This parameter specifies the lun associated with this request.
1332 *
1333 * status, zero indicates success.
1334 */
1335int isci_task_clear_aca(
1336 struct domain_device *d_device,
1337 u8 *lun)
1338{
1339 return TMF_RESP_FUNC_FAILED;
1340}
1341
1342
1343
1344/**
1345 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
1346 * functions. This is one of the Task Management functoins called by libsas.
1347 * @d_device: This parameter specifies the domain device associated with this
1348 * request.
1349 * @lun: This parameter specifies the lun associated with this request.
1350 *
1351 * status, zero indicates success.
1352 */
1353int isci_task_clear_task_set(
1354 struct domain_device *d_device,
1355 u8 *lun)
1356{
1357 return TMF_RESP_FUNC_FAILED;
1358}
1359
1360
1361/**
1362 * isci_task_query_task() - This function is implemented to cause libsas to
1363 * correctly escalate the failed abort to a LUN or target reset (this is
1364 * because sas_scsi_find_task libsas function does not correctly interpret
1365 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is
1366 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is
1367 * returned, libsas will turn this into a target reset
1368 * @task: This parameter specifies the sas task being queried.
1369 * @lun: This parameter specifies the lun associated with this request.
1370 *
1371 * status, zero indicates success.
1372 */
1373int isci_task_query_task(
1374 struct sas_task *task)
1375{
1376 /* See if there is a pending device reset for this device. */
1377 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
1378 return TMF_RESP_FUNC_FAILED;
1379 else
1380 return TMF_RESP_FUNC_SUCC;
1381}
1382
1383/**
1384 * isci_task_request_complete() - This function is called by the sci core when
1385 * an task request completes.
1386 * @isci_host: This parameter specifies the ISCI host object
1387 * @request: This parameter is the completed isci_request object.
1388 * @completion_status: This parameter specifies the completion status from the
1389 * sci core.
1390 *
1391 * none.
1392 */
1393void isci_task_request_complete(
1394 struct isci_host *isci_host,
1395 struct isci_request *request,
1396 enum sci_task_status completion_status)
1397{
1398 struct isci_remote_device *isci_device = request->isci_device;
1399 enum isci_request_status old_state;
1400 struct isci_tmf *tmf = isci_request_access_tmf(request);
1401 struct completion *tmf_complete;
1402
1403 dev_dbg(&isci_host->pdev->dev,
1404 "%s: request = %p, status=%d\n",
1405 __func__, request, completion_status);
1406
1407 old_state = isci_request_change_state(request, completed);
1408
1409 tmf->status = completion_status;
1410 request->complete_in_target = true;
1411
1412 if (SAS_PROTOCOL_SSP == tmf->proto) {
1413
1414 memcpy(&tmf->resp.resp_iu,
1415 scic_io_request_get_response_iu_address(
1416 request->sci_request_handle
1417 ),
1418 sizeof(struct sci_ssp_response_iu));
1419
1420 } else if (SAS_PROTOCOL_SATA == tmf->proto) {
1421
1422 memcpy(&tmf->resp.d2h_fis,
1423 scic_stp_io_request_get_d2h_reg_address(
1424 request->sci_request_handle
1425 ),
1426 sizeof(struct sata_fis_reg_d2h)
1427 );
1428 }
1429
1430 /* Manage the timer if it is still running. */
1431 if (tmf->timeout_timer) {
Dan Williams7c40a802011-03-02 11:49:26 -08001432 isci_del_timer(isci_host, tmf->timeout_timer);
Dan Williams6f231dd2011-07-02 22:56:22 -07001433 tmf->timeout_timer = NULL;
1434 }
1435
1436 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
1437 tmf_complete = tmf->complete;
1438
1439 scic_controller_complete_task(
1440 isci_host->core_controller,
Dan Williams3a97eec2011-03-04 11:51:43 -08001441 to_sci_dev(isci_device),
Dan Williams6f231dd2011-07-02 22:56:22 -07001442 request->sci_request_handle
1443 );
1444 /* NULL the request handle to make sure it cannot be terminated
1445 * or completed again.
1446 */
1447 request->sci_request_handle = NULL;
1448
1449 isci_request_change_state(request, unallocated);
1450 list_del_init(&request->dev_node);
1451
1452 /* The task management part completes last. */
1453 complete(tmf_complete);
1454}
1455
1456
1457/**
1458 * isci_task_ssp_request_get_lun() - This function is called by the sci core to
1459 * retrieve the lun for a given task request.
1460 * @request: This parameter is the isci_request object.
1461 *
1462 * lun for specified task request.
1463 */
1464u32 isci_task_ssp_request_get_lun(struct isci_request *request)
1465{
1466 struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
1467
1468 dev_dbg(&request->isci_host->pdev->dev,
1469 "%s: lun = %d\n", __func__, isci_tmf->lun[0]);
1470/* @todo: build lun from array of bytes to 32 bit */
1471 return isci_tmf->lun[0];
1472}
1473
1474/**
1475 * isci_task_ssp_request_get_function() - This function is called by the sci
1476 * core to retrieve the function for a given task request.
1477 * @request: This parameter is the isci_request object.
1478 *
1479 * function code for specified task request.
1480 */
1481u8 isci_task_ssp_request_get_function(struct isci_request *request)
1482{
1483 struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
1484
1485 dev_dbg(&request->isci_host->pdev->dev,
1486 "%s: func = %d\n", __func__, isci_tmf->tmf_code);
1487
1488 return isci_tmf->tmf_code;
1489}
1490
1491/**
1492 * isci_task_ssp_request_get_io_tag_to_manage() - This function is called by
1493 * the sci core to retrieve the io tag for a given task request.
1494 * @request: This parameter is the isci_request object.
1495 *
1496 * io tag for specified task request.
1497 */
1498u16 isci_task_ssp_request_get_io_tag_to_manage(struct isci_request *request)
1499{
1500 u16 io_tag = SCI_CONTROLLER_INVALID_IO_TAG;
1501
1502 if (tmf_task == request->ttype) {
1503 struct isci_tmf *tmf = isci_request_access_tmf(request);
1504 io_tag = tmf->io_tag;
1505 }
1506
1507 dev_dbg(&request->isci_host->pdev->dev,
1508 "%s: request = %p, io_tag = %d\n",
1509 __func__, request, io_tag);
1510
1511 return io_tag;
1512}
1513
1514/**
1515 * isci_task_ssp_request_get_response_data_address() - This function is called
1516 * by the sci core to retrieve the response data address for a given task
1517 * request.
1518 * @request: This parameter is the isci_request object.
1519 *
1520 * response data address for specified task request.
1521 */
1522void *isci_task_ssp_request_get_response_data_address(
1523 struct isci_request *request)
1524{
1525 struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
1526
1527 return &isci_tmf->resp.resp_iu;
1528}
1529
1530/**
1531 * isci_task_ssp_request_get_response_data_length() - This function is called
1532 * by the sci core to retrieve the response data length for a given task
1533 * request.
1534 * @request: This parameter is the isci_request object.
1535 *
1536 * response data length for specified task request.
1537 */
1538u32 isci_task_ssp_request_get_response_data_length(
1539 struct isci_request *request)
1540{
1541 struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
1542
1543 return sizeof(isci_tmf->resp.resp_iu);
1544}
1545
1546/**
1547 * isci_bus_reset_handler() - This function performs a target reset of the
1548 * device referenced by "cmd'. This function is exported through the
1549 * "struct scsi_host_template" structure such that it is called when an I/O
1550 * recovery process has escalated to a target reset. Note that this function
1551 * is called from the scsi error handler event thread, so may block on calls.
1552 * @scsi_cmd: This parameter specifies the target to be reset.
1553 *
1554 * SUCCESS if the reset process was successful, else FAILED.
1555 */
1556int isci_bus_reset_handler(struct scsi_cmnd *cmd)
1557{
1558 unsigned long flags = 0;
1559 struct isci_host *isci_host = NULL;
1560 enum sci_status status;
1561 int base_status;
1562 struct isci_remote_device *isci_dev
1563 = isci_dev_from_domain_dev(
1564 sdev_to_domain_dev(cmd->device));
1565
1566 dev_dbg(&cmd->device->sdev_gendev,
1567 "%s: cmd %p, isci_dev %p\n",
1568 __func__, cmd, isci_dev);
1569
1570 if (!isci_dev) {
1571 dev_warn(&cmd->device->sdev_gendev,
1572 "%s: isci_dev is GONE!\n",
1573 __func__);
1574
1575 return TMF_RESP_FUNC_COMPLETE; /* Nothing to reset. */
1576 }
1577
1578 if (isci_dev->isci_port != NULL)
1579 isci_host = isci_dev->isci_port->isci_host;
1580
1581 if (isci_host != NULL)
1582 spin_lock_irqsave(&isci_host->scic_lock, flags);
1583
Dan Williams3a97eec2011-03-04 11:51:43 -08001584 status = scic_remote_device_reset(to_sci_dev(isci_dev));
Dan Williams6f231dd2011-07-02 22:56:22 -07001585 if (status != SCI_SUCCESS) {
1586
1587 if (isci_host != NULL)
1588 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1589
1590 scmd_printk(KERN_WARNING, cmd,
1591 "%s: scic_remote_device_reset(%p) returned %d!\n",
1592 __func__, isci_dev, status);
1593
1594 return TMF_RESP_FUNC_FAILED;
1595 }
1596 if (isci_host != NULL)
1597 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1598
Dan Williams6f231dd2011-07-02 22:56:22 -07001599 /* Make sure all pending requests are able to be fully terminated. */
1600 isci_device_clear_reset_pending(isci_dev);
1601
1602 /* Terminate in-progress I/O now. */
1603 isci_remote_device_nuke_requests(isci_dev);
1604
1605 /* Call into the libsas default handler (which calls sas_phy_reset). */
1606 base_status = sas_eh_bus_reset_handler(cmd);
1607
1608 if (base_status != SUCCESS) {
1609
1610 /* There can be cases where the resets to individual devices
1611 * behind an expander will fail because of an unplug of the
1612 * expander itself.
1613 */
1614 scmd_printk(KERN_WARNING, cmd,
1615 "%s: sas_eh_bus_reset_handler(%p) returned %d!\n",
1616 __func__, cmd, base_status);
1617 }
1618
1619 /* WHAT TO DO HERE IF sas_phy_reset FAILS? */
1620
1621 if (isci_host != NULL)
1622 spin_lock_irqsave(&isci_host->scic_lock, flags);
Dan Williams3a97eec2011-03-04 11:51:43 -08001623 status = scic_remote_device_reset_complete(to_sci_dev(isci_dev));
Dan Williams6f231dd2011-07-02 22:56:22 -07001624
1625 if (isci_host != NULL)
1626 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1627
1628 if (status != SCI_SUCCESS) {
1629 scmd_printk(KERN_WARNING, cmd,
1630 "%s: scic_remote_device_reset_complete(%p) "
1631 "returned %d!\n",
1632 __func__, isci_dev, status);
1633 }
1634 /* WHAT TO DO HERE IF scic_remote_device_reset_complete FAILS? */
1635
1636 dev_dbg(&cmd->device->sdev_gendev,
1637 "%s: cmd %p, isci_dev %p complete.\n",
1638 __func__, cmd, isci_dev);
1639
Dan Williams6f231dd2011-07-02 22:56:22 -07001640 return TMF_RESP_FUNC_COMPLETE;
1641}