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 */
isci_task_refuse(struct isci_host * ihost,struct sas_task * task,enum service_response response,enum exec_status status)76 static 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 
isci_device_io_ready(struct isci_remote_device * idev,struct sas_task * task)106 static 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  */
isci_task_execute_task(struct sas_task * task,gfp_t gfp_flags)123 int 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 
isci_task_request_build(struct isci_host * ihost,struct isci_remote_device * idev,u16 tag,struct isci_tmf * isci_tmf)212 static 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 
isci_task_execute_tmf(struct isci_host * ihost,struct isci_remote_device * idev,struct isci_tmf * tmf,unsigned long timeout_ms)254 static 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 
isci_task_build_tmf(struct isci_tmf * tmf,enum isci_tmf_function_codes code)355 static 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 
isci_task_build_abort_task_tmf(struct isci_tmf * tmf,enum isci_tmf_function_codes code,struct isci_request * old_request)362 static 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  */
isci_task_send_lu_reset_sas(struct isci_host * isci_host,struct isci_remote_device * isci_device,u8 * lun)377 static 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 
isci_task_lu_reset(struct domain_device * dev,u8 * lun)410 int 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 *); */
isci_task_clear_nexus_port(struct asd_sas_port * port)455 int isci_task_clear_nexus_port(struct asd_sas_port *port)
456 {
457 	return TMF_RESP_FUNC_FAILED;
458 }
459 
460 
461 
isci_task_clear_nexus_ha(struct sas_ha_struct * ha)462 int 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  */
isci_task_abort_task(struct sas_task * task)476 int 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 	}
597 out:
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  */
isci_task_abort_task_set(struct domain_device * d_device,u8 * lun)615 int 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  */
isci_task_clear_task_set(struct domain_device * d_device,u8 * lun)632 int 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  */
isci_task_query_task(struct sas_task * task)651 int 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  */
671 void
isci_task_request_complete(struct isci_host * ihost,struct isci_request * ireq,enum sci_task_status completion_status)672 isci_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 
isci_reset_device(struct isci_host * ihost,struct domain_device * dev,struct isci_remote_device * idev)717 static 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 
isci_task_I_T_nexus_reset(struct domain_device * dev)758 int 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 }
782