spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / scsi / isci / remote_device.c
blobdd74b6ceeb823df92bd69e69a0964069f1b5011a
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.
5 * GPL LICENSE SUMMARY
7 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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.
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.
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.
24 * BSD LICENSE
26 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
27 * All rights reserved.
29 * Redistribution and use in source and binary forms, with or without
30 * modification, are permitted provided that the following conditions
31 * are met:
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.
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.
55 #include <scsi/sas.h>
56 #include <linux/bitops.h>
57 #include "isci.h"
58 #include "port.h"
59 #include "remote_device.h"
60 #include "request.h"
61 #include "remote_node_context.h"
62 #include "scu_event_codes.h"
63 #include "task.h"
65 /**
66 * isci_remote_device_not_ready() - This function is called by the ihost when
67 * the remote device is not ready. We mark the isci device as ready (not
68 * "ready_for_io") and signal the waiting proccess.
69 * @isci_host: This parameter specifies the isci host object.
70 * @isci_device: This parameter specifies the remote device
72 * sci_lock is held on entrance to this function.
74 static void isci_remote_device_not_ready(struct isci_host *ihost,
75 struct isci_remote_device *idev, u32 reason)
77 struct isci_request *ireq;
79 dev_dbg(&ihost->pdev->dev,
80 "%s: isci_device = %p\n", __func__, idev);
82 switch (reason) {
83 case SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED:
84 set_bit(IDEV_GONE, &idev->flags);
85 break;
86 case SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED:
87 set_bit(IDEV_IO_NCQERROR, &idev->flags);
89 /* Kill all outstanding requests for the device. */
90 list_for_each_entry(ireq, &idev->reqs_in_process, dev_node) {
92 dev_dbg(&ihost->pdev->dev,
93 "%s: isci_device = %p request = %p\n",
94 __func__, idev, ireq);
96 sci_controller_terminate_request(ihost,
97 idev,
98 ireq);
100 /* Fall through into the default case... */
101 default:
102 clear_bit(IDEV_IO_READY, &idev->flags);
103 break;
108 * isci_remote_device_ready() - This function is called by the ihost when the
109 * remote device is ready. We mark the isci device as ready and signal the
110 * waiting proccess.
111 * @ihost: our valid isci_host
112 * @idev: remote device
115 static void isci_remote_device_ready(struct isci_host *ihost, struct isci_remote_device *idev)
117 dev_dbg(&ihost->pdev->dev,
118 "%s: idev = %p\n", __func__, idev);
120 clear_bit(IDEV_IO_NCQERROR, &idev->flags);
121 set_bit(IDEV_IO_READY, &idev->flags);
122 if (test_and_clear_bit(IDEV_START_PENDING, &idev->flags))
123 wake_up(&ihost->eventq);
126 /* called once the remote node context is ready to be freed.
127 * The remote device can now report that its stop operation is complete. none
129 static void rnc_destruct_done(void *_dev)
131 struct isci_remote_device *idev = _dev;
133 BUG_ON(idev->started_request_count != 0);
134 sci_change_state(&idev->sm, SCI_DEV_STOPPED);
137 static enum sci_status sci_remote_device_terminate_requests(struct isci_remote_device *idev)
139 struct isci_host *ihost = idev->owning_port->owning_controller;
140 enum sci_status status = SCI_SUCCESS;
141 u32 i;
143 for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) {
144 struct isci_request *ireq = ihost->reqs[i];
145 enum sci_status s;
147 if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
148 ireq->target_device != idev)
149 continue;
151 s = sci_controller_terminate_request(ihost, idev, ireq);
152 if (s != SCI_SUCCESS)
153 status = s;
156 return status;
159 enum sci_status sci_remote_device_stop(struct isci_remote_device *idev,
160 u32 timeout)
162 struct sci_base_state_machine *sm = &idev->sm;
163 enum sci_remote_device_states state = sm->current_state_id;
165 switch (state) {
166 case SCI_DEV_INITIAL:
167 case SCI_DEV_FAILED:
168 case SCI_DEV_FINAL:
169 default:
170 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
171 __func__, state);
172 return SCI_FAILURE_INVALID_STATE;
173 case SCI_DEV_STOPPED:
174 return SCI_SUCCESS;
175 case SCI_DEV_STARTING:
176 /* device not started so there had better be no requests */
177 BUG_ON(idev->started_request_count != 0);
178 sci_remote_node_context_destruct(&idev->rnc,
179 rnc_destruct_done, idev);
180 /* Transition to the stopping state and wait for the
181 * remote node to complete being posted and invalidated.
183 sci_change_state(sm, SCI_DEV_STOPPING);
184 return SCI_SUCCESS;
185 case SCI_DEV_READY:
186 case SCI_STP_DEV_IDLE:
187 case SCI_STP_DEV_CMD:
188 case SCI_STP_DEV_NCQ:
189 case SCI_STP_DEV_NCQ_ERROR:
190 case SCI_STP_DEV_AWAIT_RESET:
191 case SCI_SMP_DEV_IDLE:
192 case SCI_SMP_DEV_CMD:
193 sci_change_state(sm, SCI_DEV_STOPPING);
194 if (idev->started_request_count == 0) {
195 sci_remote_node_context_destruct(&idev->rnc,
196 rnc_destruct_done, idev);
197 return SCI_SUCCESS;
198 } else
199 return sci_remote_device_terminate_requests(idev);
200 break;
201 case SCI_DEV_STOPPING:
202 /* All requests should have been terminated, but if there is an
203 * attempt to stop a device already in the stopping state, then
204 * try again to terminate.
206 return sci_remote_device_terminate_requests(idev);
207 case SCI_DEV_RESETTING:
208 sci_change_state(sm, SCI_DEV_STOPPING);
209 return SCI_SUCCESS;
213 enum sci_status sci_remote_device_reset(struct isci_remote_device *idev)
215 struct sci_base_state_machine *sm = &idev->sm;
216 enum sci_remote_device_states state = sm->current_state_id;
218 switch (state) {
219 case SCI_DEV_INITIAL:
220 case SCI_DEV_STOPPED:
221 case SCI_DEV_STARTING:
222 case SCI_SMP_DEV_IDLE:
223 case SCI_SMP_DEV_CMD:
224 case SCI_DEV_STOPPING:
225 case SCI_DEV_FAILED:
226 case SCI_DEV_RESETTING:
227 case SCI_DEV_FINAL:
228 default:
229 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
230 __func__, state);
231 return SCI_FAILURE_INVALID_STATE;
232 case SCI_DEV_READY:
233 case SCI_STP_DEV_IDLE:
234 case SCI_STP_DEV_CMD:
235 case SCI_STP_DEV_NCQ:
236 case SCI_STP_DEV_NCQ_ERROR:
237 case SCI_STP_DEV_AWAIT_RESET:
238 sci_change_state(sm, SCI_DEV_RESETTING);
239 return SCI_SUCCESS;
243 enum sci_status sci_remote_device_reset_complete(struct isci_remote_device *idev)
245 struct sci_base_state_machine *sm = &idev->sm;
246 enum sci_remote_device_states state = sm->current_state_id;
248 if (state != SCI_DEV_RESETTING) {
249 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
250 __func__, state);
251 return SCI_FAILURE_INVALID_STATE;
254 sci_change_state(sm, SCI_DEV_READY);
255 return SCI_SUCCESS;
258 enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev,
259 u32 suspend_type)
261 struct sci_base_state_machine *sm = &idev->sm;
262 enum sci_remote_device_states state = sm->current_state_id;
264 if (state != SCI_STP_DEV_CMD) {
265 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
266 __func__, state);
267 return SCI_FAILURE_INVALID_STATE;
270 return sci_remote_node_context_suspend(&idev->rnc,
271 suspend_type, NULL, NULL);
274 enum sci_status sci_remote_device_frame_handler(struct isci_remote_device *idev,
275 u32 frame_index)
277 struct sci_base_state_machine *sm = &idev->sm;
278 enum sci_remote_device_states state = sm->current_state_id;
279 struct isci_host *ihost = idev->owning_port->owning_controller;
280 enum sci_status status;
282 switch (state) {
283 case SCI_DEV_INITIAL:
284 case SCI_DEV_STOPPED:
285 case SCI_DEV_STARTING:
286 case SCI_STP_DEV_IDLE:
287 case SCI_SMP_DEV_IDLE:
288 case SCI_DEV_FINAL:
289 default:
290 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
291 __func__, state);
292 /* Return the frame back to the controller */
293 sci_controller_release_frame(ihost, frame_index);
294 return SCI_FAILURE_INVALID_STATE;
295 case SCI_DEV_READY:
296 case SCI_STP_DEV_NCQ_ERROR:
297 case SCI_STP_DEV_AWAIT_RESET:
298 case SCI_DEV_STOPPING:
299 case SCI_DEV_FAILED:
300 case SCI_DEV_RESETTING: {
301 struct isci_request *ireq;
302 struct ssp_frame_hdr hdr;
303 void *frame_header;
304 ssize_t word_cnt;
306 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
307 frame_index,
308 &frame_header);
309 if (status != SCI_SUCCESS)
310 return status;
312 word_cnt = sizeof(hdr) / sizeof(u32);
313 sci_swab32_cpy(&hdr, frame_header, word_cnt);
315 ireq = sci_request_by_tag(ihost, be16_to_cpu(hdr.tag));
316 if (ireq && ireq->target_device == idev) {
317 /* The IO request is now in charge of releasing the frame */
318 status = sci_io_request_frame_handler(ireq, frame_index);
319 } else {
320 /* We could not map this tag to a valid IO
321 * request Just toss the frame and continue
323 sci_controller_release_frame(ihost, frame_index);
325 break;
327 case SCI_STP_DEV_NCQ: {
328 struct dev_to_host_fis *hdr;
330 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
331 frame_index,
332 (void **)&hdr);
333 if (status != SCI_SUCCESS)
334 return status;
336 if (hdr->fis_type == FIS_SETDEVBITS &&
337 (hdr->status & ATA_ERR)) {
338 idev->not_ready_reason = SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED;
340 /* TODO Check sactive and complete associated IO if any. */
341 sci_change_state(sm, SCI_STP_DEV_NCQ_ERROR);
342 } else if (hdr->fis_type == FIS_REGD2H &&
343 (hdr->status & ATA_ERR)) {
345 * Some devices return D2H FIS when an NCQ error is detected.
346 * Treat this like an SDB error FIS ready reason.
348 idev->not_ready_reason = SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED;
349 sci_change_state(&idev->sm, SCI_STP_DEV_NCQ_ERROR);
350 } else
351 status = SCI_FAILURE;
353 sci_controller_release_frame(ihost, frame_index);
354 break;
356 case SCI_STP_DEV_CMD:
357 case SCI_SMP_DEV_CMD:
358 /* The device does not process any UF received from the hardware while
359 * in this state. All unsolicited frames are forwarded to the io request
360 * object.
362 status = sci_io_request_frame_handler(idev->working_request, frame_index);
363 break;
366 return status;
369 static bool is_remote_device_ready(struct isci_remote_device *idev)
372 struct sci_base_state_machine *sm = &idev->sm;
373 enum sci_remote_device_states state = sm->current_state_id;
375 switch (state) {
376 case SCI_DEV_READY:
377 case SCI_STP_DEV_IDLE:
378 case SCI_STP_DEV_CMD:
379 case SCI_STP_DEV_NCQ:
380 case SCI_STP_DEV_NCQ_ERROR:
381 case SCI_STP_DEV_AWAIT_RESET:
382 case SCI_SMP_DEV_IDLE:
383 case SCI_SMP_DEV_CMD:
384 return true;
385 default:
386 return false;
391 * called once the remote node context has transisitioned to a ready
392 * state (after suspending RX and/or TX due to early D2H fis)
394 static void atapi_remote_device_resume_done(void *_dev)
396 struct isci_remote_device *idev = _dev;
397 struct isci_request *ireq = idev->working_request;
399 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
402 enum sci_status sci_remote_device_event_handler(struct isci_remote_device *idev,
403 u32 event_code)
405 struct sci_base_state_machine *sm = &idev->sm;
406 enum sci_remote_device_states state = sm->current_state_id;
407 enum sci_status status;
409 switch (scu_get_event_type(event_code)) {
410 case SCU_EVENT_TYPE_RNC_OPS_MISC:
411 case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
412 case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
413 status = sci_remote_node_context_event_handler(&idev->rnc, event_code);
414 break;
415 case SCU_EVENT_TYPE_PTX_SCHEDULE_EVENT:
416 if (scu_get_event_code(event_code) == SCU_EVENT_IT_NEXUS_TIMEOUT) {
417 status = SCI_SUCCESS;
419 /* Suspend the associated RNC */
420 sci_remote_node_context_suspend(&idev->rnc,
421 SCI_SOFTWARE_SUSPENSION,
422 NULL, NULL);
424 dev_dbg(scirdev_to_dev(idev),
425 "%s: device: %p event code: %x: %s\n",
426 __func__, idev, event_code,
427 is_remote_device_ready(idev)
428 ? "I_T_Nexus_Timeout event"
429 : "I_T_Nexus_Timeout event in wrong state");
431 break;
433 /* Else, fall through and treat as unhandled... */
434 default:
435 dev_dbg(scirdev_to_dev(idev),
436 "%s: device: %p event code: %x: %s\n",
437 __func__, idev, event_code,
438 is_remote_device_ready(idev)
439 ? "unexpected event"
440 : "unexpected event in wrong state");
441 status = SCI_FAILURE_INVALID_STATE;
442 break;
445 if (status != SCI_SUCCESS)
446 return status;
448 if (state == SCI_STP_DEV_ATAPI_ERROR) {
449 /* For ATAPI error state resume the RNC right away. */
450 if (scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX ||
451 scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX) {
452 return sci_remote_node_context_resume(&idev->rnc,
453 atapi_remote_device_resume_done,
454 idev);
458 if (state == SCI_STP_DEV_IDLE) {
460 /* We pick up suspension events to handle specifically to this
461 * state. We resume the RNC right away.
463 if (scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX ||
464 scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX)
465 status = sci_remote_node_context_resume(&idev->rnc, NULL, NULL);
468 return status;
471 static void sci_remote_device_start_request(struct isci_remote_device *idev,
472 struct isci_request *ireq,
473 enum sci_status status)
475 struct isci_port *iport = idev->owning_port;
477 /* cleanup requests that failed after starting on the port */
478 if (status != SCI_SUCCESS)
479 sci_port_complete_io(iport, idev, ireq);
480 else {
481 kref_get(&idev->kref);
482 idev->started_request_count++;
486 enum sci_status sci_remote_device_start_io(struct isci_host *ihost,
487 struct isci_remote_device *idev,
488 struct isci_request *ireq)
490 struct sci_base_state_machine *sm = &idev->sm;
491 enum sci_remote_device_states state = sm->current_state_id;
492 struct isci_port *iport = idev->owning_port;
493 enum sci_status status;
495 switch (state) {
496 case SCI_DEV_INITIAL:
497 case SCI_DEV_STOPPED:
498 case SCI_DEV_STARTING:
499 case SCI_STP_DEV_NCQ_ERROR:
500 case SCI_DEV_STOPPING:
501 case SCI_DEV_FAILED:
502 case SCI_DEV_RESETTING:
503 case SCI_DEV_FINAL:
504 default:
505 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
506 __func__, state);
507 return SCI_FAILURE_INVALID_STATE;
508 case SCI_DEV_READY:
509 /* attempt to start an io request for this device object. The remote
510 * device object will issue the start request for the io and if
511 * successful it will start the request for the port object then
512 * increment its own request count.
514 status = sci_port_start_io(iport, idev, ireq);
515 if (status != SCI_SUCCESS)
516 return status;
518 status = sci_remote_node_context_start_io(&idev->rnc, ireq);
519 if (status != SCI_SUCCESS)
520 break;
522 status = sci_request_start(ireq);
523 break;
524 case SCI_STP_DEV_IDLE: {
525 /* handle the start io operation for a sata device that is in
526 * the command idle state. - Evalute the type of IO request to
527 * be started - If its an NCQ request change to NCQ substate -
528 * If its any other command change to the CMD substate
530 * If this is a softreset we may want to have a different
531 * substate.
533 enum sci_remote_device_states new_state;
534 struct sas_task *task = isci_request_access_task(ireq);
536 status = sci_port_start_io(iport, idev, ireq);
537 if (status != SCI_SUCCESS)
538 return status;
540 status = sci_remote_node_context_start_io(&idev->rnc, ireq);
541 if (status != SCI_SUCCESS)
542 break;
544 status = sci_request_start(ireq);
545 if (status != SCI_SUCCESS)
546 break;
548 if (task->ata_task.use_ncq)
549 new_state = SCI_STP_DEV_NCQ;
550 else {
551 idev->working_request = ireq;
552 new_state = SCI_STP_DEV_CMD;
554 sci_change_state(sm, new_state);
555 break;
557 case SCI_STP_DEV_NCQ: {
558 struct sas_task *task = isci_request_access_task(ireq);
560 if (task->ata_task.use_ncq) {
561 status = sci_port_start_io(iport, idev, ireq);
562 if (status != SCI_SUCCESS)
563 return status;
565 status = sci_remote_node_context_start_io(&idev->rnc, ireq);
566 if (status != SCI_SUCCESS)
567 break;
569 status = sci_request_start(ireq);
570 } else
571 return SCI_FAILURE_INVALID_STATE;
572 break;
574 case SCI_STP_DEV_AWAIT_RESET:
575 return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
576 case SCI_SMP_DEV_IDLE:
577 status = sci_port_start_io(iport, idev, ireq);
578 if (status != SCI_SUCCESS)
579 return status;
581 status = sci_remote_node_context_start_io(&idev->rnc, ireq);
582 if (status != SCI_SUCCESS)
583 break;
585 status = sci_request_start(ireq);
586 if (status != SCI_SUCCESS)
587 break;
589 idev->working_request = ireq;
590 sci_change_state(&idev->sm, SCI_SMP_DEV_CMD);
591 break;
592 case SCI_STP_DEV_CMD:
593 case SCI_SMP_DEV_CMD:
594 /* device is already handling a command it can not accept new commands
595 * until this one is complete.
597 return SCI_FAILURE_INVALID_STATE;
600 sci_remote_device_start_request(idev, ireq, status);
601 return status;
604 static enum sci_status common_complete_io(struct isci_port *iport,
605 struct isci_remote_device *idev,
606 struct isci_request *ireq)
608 enum sci_status status;
610 status = sci_request_complete(ireq);
611 if (status != SCI_SUCCESS)
612 return status;
614 status = sci_port_complete_io(iport, idev, ireq);
615 if (status != SCI_SUCCESS)
616 return status;
618 sci_remote_device_decrement_request_count(idev);
619 return status;
622 enum sci_status sci_remote_device_complete_io(struct isci_host *ihost,
623 struct isci_remote_device *idev,
624 struct isci_request *ireq)
626 struct sci_base_state_machine *sm = &idev->sm;
627 enum sci_remote_device_states state = sm->current_state_id;
628 struct isci_port *iport = idev->owning_port;
629 enum sci_status status;
631 switch (state) {
632 case SCI_DEV_INITIAL:
633 case SCI_DEV_STOPPED:
634 case SCI_DEV_STARTING:
635 case SCI_STP_DEV_IDLE:
636 case SCI_SMP_DEV_IDLE:
637 case SCI_DEV_FAILED:
638 case SCI_DEV_FINAL:
639 default:
640 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
641 __func__, state);
642 return SCI_FAILURE_INVALID_STATE;
643 case SCI_DEV_READY:
644 case SCI_STP_DEV_AWAIT_RESET:
645 case SCI_DEV_RESETTING:
646 status = common_complete_io(iport, idev, ireq);
647 break;
648 case SCI_STP_DEV_CMD:
649 case SCI_STP_DEV_NCQ:
650 case SCI_STP_DEV_NCQ_ERROR:
651 case SCI_STP_DEV_ATAPI_ERROR:
652 status = common_complete_io(iport, idev, ireq);
653 if (status != SCI_SUCCESS)
654 break;
656 if (ireq->sci_status == SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
657 /* This request causes hardware error, device needs to be Lun Reset.
658 * So here we force the state machine to IDLE state so the rest IOs
659 * can reach RNC state handler, these IOs will be completed by RNC with
660 * status of "DEVICE_RESET_REQUIRED", instead of "INVALID STATE".
662 sci_change_state(sm, SCI_STP_DEV_AWAIT_RESET);
663 } else if (idev->started_request_count == 0)
664 sci_change_state(sm, SCI_STP_DEV_IDLE);
665 break;
666 case SCI_SMP_DEV_CMD:
667 status = common_complete_io(iport, idev, ireq);
668 if (status != SCI_SUCCESS)
669 break;
670 sci_change_state(sm, SCI_SMP_DEV_IDLE);
671 break;
672 case SCI_DEV_STOPPING:
673 status = common_complete_io(iport, idev, ireq);
674 if (status != SCI_SUCCESS)
675 break;
677 if (idev->started_request_count == 0)
678 sci_remote_node_context_destruct(&idev->rnc,
679 rnc_destruct_done,
680 idev);
681 break;
684 if (status != SCI_SUCCESS)
685 dev_err(scirdev_to_dev(idev),
686 "%s: Port:0x%p Device:0x%p Request:0x%p Status:0x%x "
687 "could not complete\n", __func__, iport,
688 idev, ireq, status);
689 else
690 isci_put_device(idev);
692 return status;
695 static void sci_remote_device_continue_request(void *dev)
697 struct isci_remote_device *idev = dev;
699 /* we need to check if this request is still valid to continue. */
700 if (idev->working_request)
701 sci_controller_continue_io(idev->working_request);
704 enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
705 struct isci_remote_device *idev,
706 struct isci_request *ireq)
708 struct sci_base_state_machine *sm = &idev->sm;
709 enum sci_remote_device_states state = sm->current_state_id;
710 struct isci_port *iport = idev->owning_port;
711 enum sci_status status;
713 switch (state) {
714 case SCI_DEV_INITIAL:
715 case SCI_DEV_STOPPED:
716 case SCI_DEV_STARTING:
717 case SCI_SMP_DEV_IDLE:
718 case SCI_SMP_DEV_CMD:
719 case SCI_DEV_STOPPING:
720 case SCI_DEV_FAILED:
721 case SCI_DEV_RESETTING:
722 case SCI_DEV_FINAL:
723 default:
724 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
725 __func__, state);
726 return SCI_FAILURE_INVALID_STATE;
727 case SCI_STP_DEV_IDLE:
728 case SCI_STP_DEV_CMD:
729 case SCI_STP_DEV_NCQ:
730 case SCI_STP_DEV_NCQ_ERROR:
731 case SCI_STP_DEV_AWAIT_RESET:
732 status = sci_port_start_io(iport, idev, ireq);
733 if (status != SCI_SUCCESS)
734 return status;
736 status = sci_remote_node_context_start_task(&idev->rnc, ireq);
737 if (status != SCI_SUCCESS)
738 goto out;
740 status = sci_request_start(ireq);
741 if (status != SCI_SUCCESS)
742 goto out;
744 /* Note: If the remote device state is not IDLE this will
745 * replace the request that probably resulted in the task
746 * management request.
748 idev->working_request = ireq;
749 sci_change_state(sm, SCI_STP_DEV_CMD);
751 /* The remote node context must cleanup the TCi to NCQ mapping
752 * table. The only way to do this correctly is to either write
753 * to the TLCR register or to invalidate and repost the RNC. In
754 * either case the remote node context state machine will take
755 * the correct action when the remote node context is suspended
756 * and later resumed.
758 sci_remote_node_context_suspend(&idev->rnc,
759 SCI_SOFTWARE_SUSPENSION, NULL, NULL);
760 sci_remote_node_context_resume(&idev->rnc,
761 sci_remote_device_continue_request,
762 idev);
764 out:
765 sci_remote_device_start_request(idev, ireq, status);
766 /* We need to let the controller start request handler know that
767 * it can't post TC yet. We will provide a callback function to
768 * post TC when RNC gets resumed.
770 return SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS;
771 case SCI_DEV_READY:
772 status = sci_port_start_io(iport, idev, ireq);
773 if (status != SCI_SUCCESS)
774 return status;
776 status = sci_remote_node_context_start_task(&idev->rnc, ireq);
777 if (status != SCI_SUCCESS)
778 break;
780 status = sci_request_start(ireq);
781 break;
783 sci_remote_device_start_request(idev, ireq, status);
785 return status;
788 void sci_remote_device_post_request(struct isci_remote_device *idev, u32 request)
790 struct isci_port *iport = idev->owning_port;
791 u32 context;
793 context = request |
794 (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
795 (iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
796 idev->rnc.remote_node_index;
798 sci_controller_post_request(iport->owning_controller, context);
801 /* called once the remote node context has transisitioned to a
802 * ready state. This is the indication that the remote device object can also
803 * transition to ready.
805 static void remote_device_resume_done(void *_dev)
807 struct isci_remote_device *idev = _dev;
809 if (is_remote_device_ready(idev))
810 return;
812 /* go 'ready' if we are not already in a ready state */
813 sci_change_state(&idev->sm, SCI_DEV_READY);
816 static void sci_stp_remote_device_ready_idle_substate_resume_complete_handler(void *_dev)
818 struct isci_remote_device *idev = _dev;
819 struct isci_host *ihost = idev->owning_port->owning_controller;
821 /* For NCQ operation we do not issue a isci_remote_device_not_ready().
822 * As a result, avoid sending the ready notification.
824 if (idev->sm.previous_state_id != SCI_STP_DEV_NCQ)
825 isci_remote_device_ready(ihost, idev);
828 static void sci_remote_device_initial_state_enter(struct sci_base_state_machine *sm)
830 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
832 /* Initial state is a transitional state to the stopped state */
833 sci_change_state(&idev->sm, SCI_DEV_STOPPED);
837 * sci_remote_device_destruct() - free remote node context and destruct
838 * @remote_device: This parameter specifies the remote device to be destructed.
840 * Remote device objects are a limited resource. As such, they must be
841 * protected. Thus calls to construct and destruct are mutually exclusive and
842 * non-reentrant. The return value shall indicate if the device was
843 * successfully destructed or if some failure occurred. enum sci_status This value
844 * is returned if the device is successfully destructed.
845 * SCI_FAILURE_INVALID_REMOTE_DEVICE This value is returned if the supplied
846 * device isn't valid (e.g. it's already been destoryed, the handle isn't
847 * valid, etc.).
849 static enum sci_status sci_remote_device_destruct(struct isci_remote_device *idev)
851 struct sci_base_state_machine *sm = &idev->sm;
852 enum sci_remote_device_states state = sm->current_state_id;
853 struct isci_host *ihost;
855 if (state != SCI_DEV_STOPPED) {
856 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
857 __func__, state);
858 return SCI_FAILURE_INVALID_STATE;
861 ihost = idev->owning_port->owning_controller;
862 sci_controller_free_remote_node_context(ihost, idev,
863 idev->rnc.remote_node_index);
864 idev->rnc.remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
865 sci_change_state(sm, SCI_DEV_FINAL);
867 return SCI_SUCCESS;
871 * isci_remote_device_deconstruct() - This function frees an isci_remote_device.
872 * @ihost: This parameter specifies the isci host object.
873 * @idev: This parameter specifies the remote device to be freed.
876 static void isci_remote_device_deconstruct(struct isci_host *ihost, struct isci_remote_device *idev)
878 dev_dbg(&ihost->pdev->dev,
879 "%s: isci_device = %p\n", __func__, idev);
881 /* There should not be any outstanding io's. All paths to
882 * here should go through isci_remote_device_nuke_requests.
883 * If we hit this condition, we will need a way to complete
884 * io requests in process */
885 BUG_ON(!list_empty(&idev->reqs_in_process));
887 sci_remote_device_destruct(idev);
888 list_del_init(&idev->node);
889 isci_put_device(idev);
892 static void sci_remote_device_stopped_state_enter(struct sci_base_state_machine *sm)
894 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
895 struct isci_host *ihost = idev->owning_port->owning_controller;
896 u32 prev_state;
898 /* If we are entering from the stopping state let the SCI User know that
899 * the stop operation has completed.
901 prev_state = idev->sm.previous_state_id;
902 if (prev_state == SCI_DEV_STOPPING)
903 isci_remote_device_deconstruct(ihost, idev);
905 sci_controller_remote_device_stopped(ihost, idev);
908 static void sci_remote_device_starting_state_enter(struct sci_base_state_machine *sm)
910 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
911 struct isci_host *ihost = idev->owning_port->owning_controller;
913 isci_remote_device_not_ready(ihost, idev,
914 SCIC_REMOTE_DEVICE_NOT_READY_START_REQUESTED);
917 static void sci_remote_device_ready_state_enter(struct sci_base_state_machine *sm)
919 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
920 struct isci_host *ihost = idev->owning_port->owning_controller;
921 struct domain_device *dev = idev->domain_dev;
923 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_SATA)) {
924 sci_change_state(&idev->sm, SCI_STP_DEV_IDLE);
925 } else if (dev_is_expander(dev)) {
926 sci_change_state(&idev->sm, SCI_SMP_DEV_IDLE);
927 } else
928 isci_remote_device_ready(ihost, idev);
931 static void sci_remote_device_ready_state_exit(struct sci_base_state_machine *sm)
933 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
934 struct domain_device *dev = idev->domain_dev;
936 if (dev->dev_type == SAS_END_DEV) {
937 struct isci_host *ihost = idev->owning_port->owning_controller;
939 isci_remote_device_not_ready(ihost, idev,
940 SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED);
944 static void sci_remote_device_resetting_state_enter(struct sci_base_state_machine *sm)
946 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
948 sci_remote_node_context_suspend(
949 &idev->rnc, SCI_SOFTWARE_SUSPENSION, NULL, NULL);
952 static void sci_remote_device_resetting_state_exit(struct sci_base_state_machine *sm)
954 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
956 sci_remote_node_context_resume(&idev->rnc, NULL, NULL);
959 static void sci_stp_remote_device_ready_idle_substate_enter(struct sci_base_state_machine *sm)
961 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
963 idev->working_request = NULL;
964 if (sci_remote_node_context_is_ready(&idev->rnc)) {
966 * Since the RNC is ready, it's alright to finish completion
967 * processing (e.g. signal the remote device is ready). */
968 sci_stp_remote_device_ready_idle_substate_resume_complete_handler(idev);
969 } else {
970 sci_remote_node_context_resume(&idev->rnc,
971 sci_stp_remote_device_ready_idle_substate_resume_complete_handler,
972 idev);
976 static void sci_stp_remote_device_ready_cmd_substate_enter(struct sci_base_state_machine *sm)
978 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
979 struct isci_host *ihost = idev->owning_port->owning_controller;
981 BUG_ON(idev->working_request == NULL);
983 isci_remote_device_not_ready(ihost, idev,
984 SCIC_REMOTE_DEVICE_NOT_READY_SATA_REQUEST_STARTED);
987 static void sci_stp_remote_device_ready_ncq_error_substate_enter(struct sci_base_state_machine *sm)
989 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
990 struct isci_host *ihost = idev->owning_port->owning_controller;
992 if (idev->not_ready_reason == SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED)
993 isci_remote_device_not_ready(ihost, idev,
994 idev->not_ready_reason);
997 static void sci_smp_remote_device_ready_idle_substate_enter(struct sci_base_state_machine *sm)
999 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
1000 struct isci_host *ihost = idev->owning_port->owning_controller;
1002 isci_remote_device_ready(ihost, idev);
1005 static void sci_smp_remote_device_ready_cmd_substate_enter(struct sci_base_state_machine *sm)
1007 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
1008 struct isci_host *ihost = idev->owning_port->owning_controller;
1010 BUG_ON(idev->working_request == NULL);
1012 isci_remote_device_not_ready(ihost, idev,
1013 SCIC_REMOTE_DEVICE_NOT_READY_SMP_REQUEST_STARTED);
1016 static void sci_smp_remote_device_ready_cmd_substate_exit(struct sci_base_state_machine *sm)
1018 struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
1020 idev->working_request = NULL;
1023 static const struct sci_base_state sci_remote_device_state_table[] = {
1024 [SCI_DEV_INITIAL] = {
1025 .enter_state = sci_remote_device_initial_state_enter,
1027 [SCI_DEV_STOPPED] = {
1028 .enter_state = sci_remote_device_stopped_state_enter,
1030 [SCI_DEV_STARTING] = {
1031 .enter_state = sci_remote_device_starting_state_enter,
1033 [SCI_DEV_READY] = {
1034 .enter_state = sci_remote_device_ready_state_enter,
1035 .exit_state = sci_remote_device_ready_state_exit
1037 [SCI_STP_DEV_IDLE] = {
1038 .enter_state = sci_stp_remote_device_ready_idle_substate_enter,
1040 [SCI_STP_DEV_CMD] = {
1041 .enter_state = sci_stp_remote_device_ready_cmd_substate_enter,
1043 [SCI_STP_DEV_NCQ] = { },
1044 [SCI_STP_DEV_NCQ_ERROR] = {
1045 .enter_state = sci_stp_remote_device_ready_ncq_error_substate_enter,
1047 [SCI_STP_DEV_ATAPI_ERROR] = { },
1048 [SCI_STP_DEV_AWAIT_RESET] = { },
1049 [SCI_SMP_DEV_IDLE] = {
1050 .enter_state = sci_smp_remote_device_ready_idle_substate_enter,
1052 [SCI_SMP_DEV_CMD] = {
1053 .enter_state = sci_smp_remote_device_ready_cmd_substate_enter,
1054 .exit_state = sci_smp_remote_device_ready_cmd_substate_exit,
1056 [SCI_DEV_STOPPING] = { },
1057 [SCI_DEV_FAILED] = { },
1058 [SCI_DEV_RESETTING] = {
1059 .enter_state = sci_remote_device_resetting_state_enter,
1060 .exit_state = sci_remote_device_resetting_state_exit
1062 [SCI_DEV_FINAL] = { },
1066 * sci_remote_device_construct() - common construction
1067 * @sci_port: SAS/SATA port through which this device is accessed.
1068 * @sci_dev: remote device to construct
1070 * This routine just performs benign initialization and does not
1071 * allocate the remote_node_context which is left to
1072 * sci_remote_device_[de]a_construct(). sci_remote_device_destruct()
1073 * frees the remote_node_context(s) for the device.
1075 static void sci_remote_device_construct(struct isci_port *iport,
1076 struct isci_remote_device *idev)
1078 idev->owning_port = iport;
1079 idev->started_request_count = 0;
1081 sci_init_sm(&idev->sm, sci_remote_device_state_table, SCI_DEV_INITIAL);
1083 sci_remote_node_context_construct(&idev->rnc,
1084 SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX);
1088 * sci_remote_device_da_construct() - construct direct attached device.
1090 * The information (e.g. IAF, Signature FIS, etc.) necessary to build
1091 * the device is known to the SCI Core since it is contained in the
1092 * sci_phy object. Remote node context(s) is/are a global resource
1093 * allocated by this routine, freed by sci_remote_device_destruct().
1095 * Returns:
1096 * SCI_FAILURE_DEVICE_EXISTS - device has already been constructed.
1097 * SCI_FAILURE_UNSUPPORTED_PROTOCOL - e.g. sas device attached to
1098 * sata-only controller instance.
1099 * SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
1101 static enum sci_status sci_remote_device_da_construct(struct isci_port *iport,
1102 struct isci_remote_device *idev)
1104 enum sci_status status;
1105 struct sci_port_properties properties;
1106 struct domain_device *dev = idev->domain_dev;
1108 sci_remote_device_construct(iport, idev);
1111 * This information is request to determine how many remote node context
1112 * entries will be needed to store the remote node.
1114 idev->is_direct_attached = true;
1116 sci_port_get_properties(iport, &properties);
1117 /* Get accurate port width from port's phy mask for a DA device. */
1118 idev->device_port_width = hweight32(properties.phy_mask);
1120 status = sci_controller_allocate_remote_node_context(iport->owning_controller,
1121 idev,
1122 &idev->rnc.remote_node_index);
1124 if (status != SCI_SUCCESS)
1125 return status;
1127 if (dev->dev_type == SAS_END_DEV || dev->dev_type == SATA_DEV ||
1128 (dev->tproto & SAS_PROTOCOL_STP) || dev_is_expander(dev))
1129 /* pass */;
1130 else
1131 return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
1133 idev->connection_rate = sci_port_get_max_allowed_speed(iport);
1135 return SCI_SUCCESS;
1139 * sci_remote_device_ea_construct() - construct expander attached device
1141 * Remote node context(s) is/are a global resource allocated by this
1142 * routine, freed by sci_remote_device_destruct().
1144 * Returns:
1145 * SCI_FAILURE_DEVICE_EXISTS - device has already been constructed.
1146 * SCI_FAILURE_UNSUPPORTED_PROTOCOL - e.g. sas device attached to
1147 * sata-only controller instance.
1148 * SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
1150 static enum sci_status sci_remote_device_ea_construct(struct isci_port *iport,
1151 struct isci_remote_device *idev)
1153 struct domain_device *dev = idev->domain_dev;
1154 enum sci_status status;
1156 sci_remote_device_construct(iport, idev);
1158 status = sci_controller_allocate_remote_node_context(iport->owning_controller,
1159 idev,
1160 &idev->rnc.remote_node_index);
1161 if (status != SCI_SUCCESS)
1162 return status;
1164 if (dev->dev_type == SAS_END_DEV || dev->dev_type == SATA_DEV ||
1165 (dev->tproto & SAS_PROTOCOL_STP) || dev_is_expander(dev))
1166 /* pass */;
1167 else
1168 return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
1171 * For SAS-2 the physical link rate is actually a logical link
1172 * rate that incorporates multiplexing. The SCU doesn't
1173 * incorporate multiplexing and for the purposes of the
1174 * connection the logical link rate is that same as the
1175 * physical. Furthermore, the SAS-2 and SAS-1.1 fields overlay
1176 * one another, so this code works for both situations. */
1177 idev->connection_rate = min_t(u16, sci_port_get_max_allowed_speed(iport),
1178 dev->linkrate);
1180 /* / @todo Should I assign the port width by reading all of the phys on the port? */
1181 idev->device_port_width = 1;
1183 return SCI_SUCCESS;
1187 * sci_remote_device_start() - This method will start the supplied remote
1188 * device. This method enables normal IO requests to flow through to the
1189 * remote device.
1190 * @remote_device: This parameter specifies the device to be started.
1191 * @timeout: This parameter specifies the number of milliseconds in which the
1192 * start operation should complete.
1194 * An indication of whether the device was successfully started. SCI_SUCCESS
1195 * This value is returned if the device was successfully started.
1196 * SCI_FAILURE_INVALID_PHY This value is returned if the user attempts to start
1197 * the device when there have been no phys added to it.
1199 static enum sci_status sci_remote_device_start(struct isci_remote_device *idev,
1200 u32 timeout)
1202 struct sci_base_state_machine *sm = &idev->sm;
1203 enum sci_remote_device_states state = sm->current_state_id;
1204 enum sci_status status;
1206 if (state != SCI_DEV_STOPPED) {
1207 dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
1208 __func__, state);
1209 return SCI_FAILURE_INVALID_STATE;
1212 status = sci_remote_node_context_resume(&idev->rnc,
1213 remote_device_resume_done,
1214 idev);
1215 if (status != SCI_SUCCESS)
1216 return status;
1218 sci_change_state(sm, SCI_DEV_STARTING);
1220 return SCI_SUCCESS;
1223 static enum sci_status isci_remote_device_construct(struct isci_port *iport,
1224 struct isci_remote_device *idev)
1226 struct isci_host *ihost = iport->isci_host;
1227 struct domain_device *dev = idev->domain_dev;
1228 enum sci_status status;
1230 if (dev->parent && dev_is_expander(dev->parent))
1231 status = sci_remote_device_ea_construct(iport, idev);
1232 else
1233 status = sci_remote_device_da_construct(iport, idev);
1235 if (status != SCI_SUCCESS) {
1236 dev_dbg(&ihost->pdev->dev, "%s: construct failed: %d\n",
1237 __func__, status);
1239 return status;
1242 /* start the device. */
1243 status = sci_remote_device_start(idev, ISCI_REMOTE_DEVICE_START_TIMEOUT);
1245 if (status != SCI_SUCCESS)
1246 dev_warn(&ihost->pdev->dev, "remote device start failed: %d\n",
1247 status);
1249 return status;
1252 void isci_remote_device_nuke_requests(struct isci_host *ihost, struct isci_remote_device *idev)
1254 DECLARE_COMPLETION_ONSTACK(aborted_task_completion);
1256 dev_dbg(&ihost->pdev->dev,
1257 "%s: idev = %p\n", __func__, idev);
1259 /* Cleanup all requests pending for this device. */
1260 isci_terminate_pending_requests(ihost, idev);
1262 dev_dbg(&ihost->pdev->dev,
1263 "%s: idev = %p, done\n", __func__, idev);
1267 * This function builds the isci_remote_device when a libsas dev_found message
1268 * is received.
1269 * @isci_host: This parameter specifies the isci host object.
1270 * @port: This parameter specifies the isci_port conected to this device.
1272 * pointer to new isci_remote_device.
1274 static struct isci_remote_device *
1275 isci_remote_device_alloc(struct isci_host *ihost, struct isci_port *iport)
1277 struct isci_remote_device *idev;
1278 int i;
1280 for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
1281 idev = &ihost->devices[i];
1282 if (!test_and_set_bit(IDEV_ALLOCATED, &idev->flags))
1283 break;
1286 if (i >= SCI_MAX_REMOTE_DEVICES) {
1287 dev_warn(&ihost->pdev->dev, "%s: failed\n", __func__);
1288 return NULL;
1291 if (WARN_ONCE(!list_empty(&idev->reqs_in_process), "found requests in process\n"))
1292 return NULL;
1294 if (WARN_ONCE(!list_empty(&idev->node), "found non-idle remote device\n"))
1295 return NULL;
1297 return idev;
1300 void isci_remote_device_release(struct kref *kref)
1302 struct isci_remote_device *idev = container_of(kref, typeof(*idev), kref);
1303 struct isci_host *ihost = idev->isci_port->isci_host;
1305 idev->domain_dev = NULL;
1306 idev->isci_port = NULL;
1307 clear_bit(IDEV_START_PENDING, &idev->flags);
1308 clear_bit(IDEV_STOP_PENDING, &idev->flags);
1309 clear_bit(IDEV_IO_READY, &idev->flags);
1310 clear_bit(IDEV_GONE, &idev->flags);
1311 clear_bit(IDEV_EH, &idev->flags);
1312 smp_mb__before_clear_bit();
1313 clear_bit(IDEV_ALLOCATED, &idev->flags);
1314 wake_up(&ihost->eventq);
1318 * isci_remote_device_stop() - This function is called internally to stop the
1319 * remote device.
1320 * @isci_host: This parameter specifies the isci host object.
1321 * @isci_device: This parameter specifies the remote device.
1323 * The status of the ihost request to stop.
1325 enum sci_status isci_remote_device_stop(struct isci_host *ihost, struct isci_remote_device *idev)
1327 enum sci_status status;
1328 unsigned long flags;
1330 dev_dbg(&ihost->pdev->dev,
1331 "%s: isci_device = %p\n", __func__, idev);
1333 spin_lock_irqsave(&ihost->scic_lock, flags);
1334 idev->domain_dev->lldd_dev = NULL; /* disable new lookups */
1335 set_bit(IDEV_GONE, &idev->flags);
1336 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1338 /* Kill all outstanding requests. */
1339 isci_remote_device_nuke_requests(ihost, idev);
1341 set_bit(IDEV_STOP_PENDING, &idev->flags);
1343 spin_lock_irqsave(&ihost->scic_lock, flags);
1344 status = sci_remote_device_stop(idev, 50);
1345 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1347 /* Wait for the stop complete callback. */
1348 if (WARN_ONCE(status != SCI_SUCCESS, "failed to stop device\n"))
1349 /* nothing to wait for */;
1350 else
1351 wait_for_device_stop(ihost, idev);
1353 return status;
1357 * isci_remote_device_gone() - This function is called by libsas when a domain
1358 * device is removed.
1359 * @domain_device: This parameter specifies the libsas domain device.
1362 void isci_remote_device_gone(struct domain_device *dev)
1364 struct isci_host *ihost = dev_to_ihost(dev);
1365 struct isci_remote_device *idev = dev->lldd_dev;
1367 dev_dbg(&ihost->pdev->dev,
1368 "%s: domain_device = %p, isci_device = %p, isci_port = %p\n",
1369 __func__, dev, idev, idev->isci_port);
1371 isci_remote_device_stop(ihost, idev);
1376 * isci_remote_device_found() - This function is called by libsas when a remote
1377 * device is discovered. A remote device object is created and started. the
1378 * function then sleeps until the sci core device started message is
1379 * received.
1380 * @domain_device: This parameter specifies the libsas domain device.
1382 * status, zero indicates success.
1384 int isci_remote_device_found(struct domain_device *domain_dev)
1386 struct isci_host *isci_host = dev_to_ihost(domain_dev);
1387 struct isci_port *isci_port;
1388 struct isci_phy *isci_phy;
1389 struct asd_sas_port *sas_port;
1390 struct asd_sas_phy *sas_phy;
1391 struct isci_remote_device *isci_device;
1392 enum sci_status status;
1394 dev_dbg(&isci_host->pdev->dev,
1395 "%s: domain_device = %p\n", __func__, domain_dev);
1397 wait_for_start(isci_host);
1399 sas_port = domain_dev->port;
1400 sas_phy = list_first_entry(&sas_port->phy_list, struct asd_sas_phy,
1401 port_phy_el);
1402 isci_phy = to_iphy(sas_phy);
1403 isci_port = isci_phy->isci_port;
1405 /* we are being called for a device on this port,
1406 * so it has to come up eventually
1408 wait_for_completion(&isci_port->start_complete);
1410 if ((isci_stopping == isci_port_get_state(isci_port)) ||
1411 (isci_stopped == isci_port_get_state(isci_port)))
1412 return -ENODEV;
1414 isci_device = isci_remote_device_alloc(isci_host, isci_port);
1415 if (!isci_device)
1416 return -ENODEV;
1418 kref_init(&isci_device->kref);
1419 INIT_LIST_HEAD(&isci_device->node);
1421 spin_lock_irq(&isci_host->scic_lock);
1422 isci_device->domain_dev = domain_dev;
1423 isci_device->isci_port = isci_port;
1424 list_add_tail(&isci_device->node, &isci_port->remote_dev_list);
1426 set_bit(IDEV_START_PENDING, &isci_device->flags);
1427 status = isci_remote_device_construct(isci_port, isci_device);
1429 dev_dbg(&isci_host->pdev->dev,
1430 "%s: isci_device = %p\n",
1431 __func__, isci_device);
1433 if (status == SCI_SUCCESS) {
1434 /* device came up, advertise it to the world */
1435 domain_dev->lldd_dev = isci_device;
1436 } else
1437 isci_put_device(isci_device);
1438 spin_unlock_irq(&isci_host->scic_lock);
1440 /* wait for the device ready callback. */
1441 wait_for_device_start(isci_host, isci_device);
1443 return status == SCI_SUCCESS ? 0 : -ENODEV;