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-rw-r--r--drivers/scsi/isci/remote_node_context.c627
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diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
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1/*
2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
4 *
5 * GPL LICENSE SUMMARY
6 *
7 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * BSD LICENSE
25 *
26 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
27 * All rights reserved.
28 *
29 * Redistribution and use in source and binary forms, with or without
30 * modification, are permitted provided that the following conditions
31 * are met:
32 *
33 * * Redistributions of source code must retain the above copyright
34 * notice, this list of conditions and the following disclaimer.
35 * * Redistributions in binary form must reproduce the above copyright
36 * notice, this list of conditions and the following disclaimer in
37 * the documentation and/or other materials provided with the
38 * distribution.
39 * * Neither the name of Intel Corporation nor the names of its
40 * contributors may be used to endorse or promote products derived
41 * from this software without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 */
55
56#include "host.h"
57#include "isci.h"
58#include "remote_device.h"
59#include "remote_node_context.h"
60#include "scu_event_codes.h"
61#include "scu_task_context.h"
62
63
64/**
65 *
66 * @sci_rnc: The RNC for which the is posted request is being made.
67 *
68 * This method will return true if the RNC is not in the initial state. In all
69 * other states the RNC is considered active and this will return true. The
70 * destroy request of the state machine drives the RNC back to the initial
71 * state. If the state machine changes then this routine will also have to be
72 * changed. bool true if the state machine is not in the initial state false if
73 * the state machine is in the initial state
74 */
75
76/**
77 *
78 * @sci_rnc: The state of the remote node context object to check.
79 *
80 * This method will return true if the remote node context is in a READY state
81 * otherwise it will return false bool true if the remote node context is in
82 * the ready state. false if the remote node context is not in the ready state.
83 */
84bool sci_remote_node_context_is_ready(
85 struct sci_remote_node_context *sci_rnc)
86{
87 u32 current_state = sci_rnc->sm.current_state_id;
88
89 if (current_state == SCI_RNC_READY) {
90 return true;
91 }
92
93 return false;
94}
95
96static union scu_remote_node_context *sci_rnc_by_id(struct isci_host *ihost, u16 id)
97{
98 if (id < ihost->remote_node_entries &&
99 ihost->device_table[id])
100 return &ihost->remote_node_context_table[id];
101
102 return NULL;
103}
104
105static void sci_remote_node_context_construct_buffer(struct sci_remote_node_context *sci_rnc)
106{
107 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
108 struct domain_device *dev = idev->domain_dev;
109 int rni = sci_rnc->remote_node_index;
110 union scu_remote_node_context *rnc;
111 struct isci_host *ihost;
112 __le64 sas_addr;
113
114 ihost = idev->owning_port->owning_controller;
115 rnc = sci_rnc_by_id(ihost, rni);
116
117 memset(rnc, 0, sizeof(union scu_remote_node_context)
118 * sci_remote_device_node_count(idev));
119
120 rnc->ssp.remote_node_index = rni;
121 rnc->ssp.remote_node_port_width = idev->device_port_width;
122 rnc->ssp.logical_port_index = idev->owning_port->physical_port_index;
123
124 /* sas address is __be64, context ram format is __le64 */
125 sas_addr = cpu_to_le64(SAS_ADDR(dev->sas_addr));
126 rnc->ssp.remote_sas_address_hi = upper_32_bits(sas_addr);
127 rnc->ssp.remote_sas_address_lo = lower_32_bits(sas_addr);
128
129 rnc->ssp.nexus_loss_timer_enable = true;
130 rnc->ssp.check_bit = false;
131 rnc->ssp.is_valid = false;
132 rnc->ssp.is_remote_node_context = true;
133 rnc->ssp.function_number = 0;
134
135 rnc->ssp.arbitration_wait_time = 0;
136
137 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
138 rnc->ssp.connection_occupancy_timeout =
139 ihost->user_parameters.stp_max_occupancy_timeout;
140 rnc->ssp.connection_inactivity_timeout =
141 ihost->user_parameters.stp_inactivity_timeout;
142 } else {
143 rnc->ssp.connection_occupancy_timeout =
144 ihost->user_parameters.ssp_max_occupancy_timeout;
145 rnc->ssp.connection_inactivity_timeout =
146 ihost->user_parameters.ssp_inactivity_timeout;
147 }
148
149 rnc->ssp.initial_arbitration_wait_time = 0;
150
151 /* Open Address Frame Parameters */
152 rnc->ssp.oaf_connection_rate = idev->connection_rate;
153 rnc->ssp.oaf_features = 0;
154 rnc->ssp.oaf_source_zone_group = 0;
155 rnc->ssp.oaf_more_compatibility_features = 0;
156}
157
158/**
159 *
160 * @sci_rnc:
161 * @callback:
162 * @callback_parameter:
163 *
164 * This method will setup the remote node context object so it will transition
165 * to its ready state. If the remote node context is already setup to
166 * transition to its final state then this function does nothing. none
167 */
168static void sci_remote_node_context_setup_to_resume(
169 struct sci_remote_node_context *sci_rnc,
170 scics_sds_remote_node_context_callback callback,
171 void *callback_parameter)
172{
173 if (sci_rnc->destination_state != SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL) {
174 sci_rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY;
175 sci_rnc->user_callback = callback;
176 sci_rnc->user_cookie = callback_parameter;
177 }
178}
179
180static void sci_remote_node_context_setup_to_destory(
181 struct sci_remote_node_context *sci_rnc,
182 scics_sds_remote_node_context_callback callback,
183 void *callback_parameter)
184{
185 sci_rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL;
186 sci_rnc->user_callback = callback;
187 sci_rnc->user_cookie = callback_parameter;
188}
189
190/**
191 *
192 *
193 * This method just calls the user callback function and then resets the
194 * callback.
195 */
196static void sci_remote_node_context_notify_user(
197 struct sci_remote_node_context *rnc)
198{
199 if (rnc->user_callback != NULL) {
200 (*rnc->user_callback)(rnc->user_cookie);
201
202 rnc->user_callback = NULL;
203 rnc->user_cookie = NULL;
204 }
205}
206
207static void sci_remote_node_context_continue_state_transitions(struct sci_remote_node_context *rnc)
208{
209 if (rnc->destination_state == SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY)
210 sci_remote_node_context_resume(rnc, rnc->user_callback,
211 rnc->user_cookie);
212}
213
214static void sci_remote_node_context_validate_context_buffer(struct sci_remote_node_context *sci_rnc)
215{
216 union scu_remote_node_context *rnc_buffer;
217 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
218 struct domain_device *dev = idev->domain_dev;
219 struct isci_host *ihost = idev->owning_port->owning_controller;
220
221 rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);
222
223 rnc_buffer->ssp.is_valid = true;
224
225 if (!idev->is_direct_attached &&
226 (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))) {
227 sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_96);
228 } else {
229 sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_32);
230
231 if (idev->is_direct_attached)
232 sci_port_setup_transports(idev->owning_port,
233 sci_rnc->remote_node_index);
234 }
235}
236
237static void sci_remote_node_context_invalidate_context_buffer(struct sci_remote_node_context *sci_rnc)
238{
239 union scu_remote_node_context *rnc_buffer;
240 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
241 struct isci_host *ihost = idev->owning_port->owning_controller;
242
243 rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);
244
245 rnc_buffer->ssp.is_valid = false;
246
247 sci_remote_device_post_request(rnc_to_dev(sci_rnc),
248 SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE);
249}
250
251static void sci_remote_node_context_initial_state_enter(struct sci_base_state_machine *sm)
252{
253 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
254
255 /* Check to see if we have gotten back to the initial state because
256 * someone requested to destroy the remote node context object.
257 */
258 if (sm->previous_state_id == SCI_RNC_INVALIDATING) {
259 rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
260 sci_remote_node_context_notify_user(rnc);
261 }
262}
263
264static void sci_remote_node_context_posting_state_enter(struct sci_base_state_machine *sm)
265{
266 struct sci_remote_node_context *sci_rnc = container_of(sm, typeof(*sci_rnc), sm);
267
268 sci_remote_node_context_validate_context_buffer(sci_rnc);
269}
270
271static void sci_remote_node_context_invalidating_state_enter(struct sci_base_state_machine *sm)
272{
273 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
274
275 sci_remote_node_context_invalidate_context_buffer(rnc);
276}
277
278static void sci_remote_node_context_resuming_state_enter(struct sci_base_state_machine *sm)
279{
280 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
281 struct isci_remote_device *idev;
282 struct domain_device *dev;
283
284 idev = rnc_to_dev(rnc);
285 dev = idev->domain_dev;
286
287 /*
288 * For direct attached SATA devices we need to clear the TLCR
289 * NCQ to TCi tag mapping on the phy and in cases where we
290 * resume because of a target reset we also need to update
291 * the STPTLDARNI register with the RNi of the device
292 */
293 if ((dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) &&
294 idev->is_direct_attached)
295 sci_port_setup_transports(idev->owning_port,
296 rnc->remote_node_index);
297
298 sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_RESUME);
299}
300
301static void sci_remote_node_context_ready_state_enter(struct sci_base_state_machine *sm)
302{
303 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
304
305 rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
306
307 if (rnc->user_callback)
308 sci_remote_node_context_notify_user(rnc);
309}
310
311static void sci_remote_node_context_tx_suspended_state_enter(struct sci_base_state_machine *sm)
312{
313 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
314
315 sci_remote_node_context_continue_state_transitions(rnc);
316}
317
318static void sci_remote_node_context_tx_rx_suspended_state_enter(struct sci_base_state_machine *sm)
319{
320 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
321
322 sci_remote_node_context_continue_state_transitions(rnc);
323}
324
325static const struct sci_base_state sci_remote_node_context_state_table[] = {
326 [SCI_RNC_INITIAL] = {
327 .enter_state = sci_remote_node_context_initial_state_enter,
328 },
329 [SCI_RNC_POSTING] = {
330 .enter_state = sci_remote_node_context_posting_state_enter,
331 },
332 [SCI_RNC_INVALIDATING] = {
333 .enter_state = sci_remote_node_context_invalidating_state_enter,
334 },
335 [SCI_RNC_RESUMING] = {
336 .enter_state = sci_remote_node_context_resuming_state_enter,
337 },
338 [SCI_RNC_READY] = {
339 .enter_state = sci_remote_node_context_ready_state_enter,
340 },
341 [SCI_RNC_TX_SUSPENDED] = {
342 .enter_state = sci_remote_node_context_tx_suspended_state_enter,
343 },
344 [SCI_RNC_TX_RX_SUSPENDED] = {
345 .enter_state = sci_remote_node_context_tx_rx_suspended_state_enter,
346 },
347 [SCI_RNC_AWAIT_SUSPENSION] = { },
348};
349
350void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
351 u16 remote_node_index)
352{
353 memset(rnc, 0, sizeof(struct sci_remote_node_context));
354
355 rnc->remote_node_index = remote_node_index;
356 rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
357
358 sci_init_sm(&rnc->sm, sci_remote_node_context_state_table, SCI_RNC_INITIAL);
359}
360
361enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
362 u32 event_code)
363{
364 enum scis_sds_remote_node_context_states state;
365
366 state = sci_rnc->sm.current_state_id;
367 switch (state) {
368 case SCI_RNC_POSTING:
369 switch (scu_get_event_code(event_code)) {
370 case SCU_EVENT_POST_RNC_COMPLETE:
371 sci_change_state(&sci_rnc->sm, SCI_RNC_READY);
372 break;
373 default:
374 goto out;
375 }
376 break;
377 case SCI_RNC_INVALIDATING:
378 if (scu_get_event_code(event_code) == SCU_EVENT_POST_RNC_INVALIDATE_COMPLETE) {
379 if (sci_rnc->destination_state == SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL)
380 state = SCI_RNC_INITIAL;
381 else
382 state = SCI_RNC_POSTING;
383 sci_change_state(&sci_rnc->sm, state);
384 } else {
385 switch (scu_get_event_type(event_code)) {
386 case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
387 case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
388 /* We really dont care if the hardware is going to suspend
389 * the device since it's being invalidated anyway */
390 dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
391 "%s: SCIC Remote Node Context 0x%p was "
392 "suspeneded by hardware while being "
393 "invalidated.\n", __func__, sci_rnc);
394 break;
395 default:
396 goto out;
397 }
398 }
399 break;
400 case SCI_RNC_RESUMING:
401 if (scu_get_event_code(event_code) == SCU_EVENT_POST_RCN_RELEASE) {
402 sci_change_state(&sci_rnc->sm, SCI_RNC_READY);
403 } else {
404 switch (scu_get_event_type(event_code)) {
405 case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
406 case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
407 /* We really dont care if the hardware is going to suspend
408 * the device since it's being resumed anyway */
409 dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
410 "%s: SCIC Remote Node Context 0x%p was "
411 "suspeneded by hardware while being resumed.\n",
412 __func__, sci_rnc);
413 break;
414 default:
415 goto out;
416 }
417 }
418 break;
419 case SCI_RNC_READY:
420 switch (scu_get_event_type(event_code)) {
421 case SCU_EVENT_TL_RNC_SUSPEND_TX:
422 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_SUSPENDED);
423 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
424 break;
425 case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
426 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
427 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
428 break;
429 default:
430 goto out;
431 }
432 break;
433 case SCI_RNC_AWAIT_SUSPENSION:
434 switch (scu_get_event_type(event_code)) {
435 case SCU_EVENT_TL_RNC_SUSPEND_TX:
436 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_SUSPENDED);
437 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
438 break;
439 case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
440 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
441 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
442 break;
443 default:
444 goto out;
445 }
446 break;
447 default:
448 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
449 "%s: invalid state %d\n", __func__, state);
450 return SCI_FAILURE_INVALID_STATE;
451 }
452 return SCI_SUCCESS;
453
454 out:
455 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
456 "%s: code: %#x state: %d\n", __func__, event_code, state);
457 return SCI_FAILURE;
458
459}
460
461enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
462 scics_sds_remote_node_context_callback cb_fn,
463 void *cb_p)
464{
465 enum scis_sds_remote_node_context_states state;
466
467 state = sci_rnc->sm.current_state_id;
468 switch (state) {
469 case SCI_RNC_INVALIDATING:
470 sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
471 return SCI_SUCCESS;
472 case SCI_RNC_POSTING:
473 case SCI_RNC_RESUMING:
474 case SCI_RNC_READY:
475 case SCI_RNC_TX_SUSPENDED:
476 case SCI_RNC_TX_RX_SUSPENDED:
477 case SCI_RNC_AWAIT_SUSPENSION:
478 sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
479 sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
480 return SCI_SUCCESS;
481 case SCI_RNC_INITIAL:
482 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
483 "%s: invalid state %d\n", __func__, state);
484 /* We have decided that the destruct request on the remote node context
485 * can not fail since it is either in the initial/destroyed state or is
486 * can be destroyed.
487 */
488 return SCI_SUCCESS;
489 default:
490 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
491 "%s: invalid state %d\n", __func__, state);
492 return SCI_FAILURE_INVALID_STATE;
493 }
494}
495
496enum sci_status sci_remote_node_context_suspend(struct sci_remote_node_context *sci_rnc,
497 u32 suspend_type,
498 scics_sds_remote_node_context_callback cb_fn,
499 void *cb_p)
500{
501 enum scis_sds_remote_node_context_states state;
502
503 state = sci_rnc->sm.current_state_id;
504 if (state != SCI_RNC_READY) {
505 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
506 "%s: invalid state %d\n", __func__, state);
507 return SCI_FAILURE_INVALID_STATE;
508 }
509
510 sci_rnc->user_callback = cb_fn;
511 sci_rnc->user_cookie = cb_p;
512 sci_rnc->suspension_code = suspend_type;
513
514 if (suspend_type == SCI_SOFTWARE_SUSPENSION) {
515 sci_remote_device_post_request(rnc_to_dev(sci_rnc),
516 SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX);
517 }
518
519 sci_change_state(&sci_rnc->sm, SCI_RNC_AWAIT_SUSPENSION);
520 return SCI_SUCCESS;
521}
522
523enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
524 scics_sds_remote_node_context_callback cb_fn,
525 void *cb_p)
526{
527 enum scis_sds_remote_node_context_states state;
528
529 state = sci_rnc->sm.current_state_id;
530 switch (state) {
531 case SCI_RNC_INITIAL:
532 if (sci_rnc->remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
533 return SCI_FAILURE_INVALID_STATE;
534
535 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
536 sci_remote_node_context_construct_buffer(sci_rnc);
537 sci_change_state(&sci_rnc->sm, SCI_RNC_POSTING);
538 return SCI_SUCCESS;
539 case SCI_RNC_POSTING:
540 case SCI_RNC_INVALIDATING:
541 case SCI_RNC_RESUMING:
542 if (sci_rnc->destination_state != SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY)
543 return SCI_FAILURE_INVALID_STATE;
544
545 sci_rnc->user_callback = cb_fn;
546 sci_rnc->user_cookie = cb_p;
547 return SCI_SUCCESS;
548 case SCI_RNC_TX_SUSPENDED: {
549 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
550 struct domain_device *dev = idev->domain_dev;
551
552 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
553
554 /* TODO: consider adding a resume action of NONE, INVALIDATE, WRITE_TLCR */
555 if (dev->dev_type == SAS_END_DEV || dev_is_expander(dev))
556 sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
557 else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
558 if (idev->is_direct_attached) {
559 /* @todo Fix this since I am being silly in writing to the STPTLDARNI register. */
560 sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
561 } else {
562 sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
563 }
564 } else
565 return SCI_FAILURE;
566 return SCI_SUCCESS;
567 }
568 case SCI_RNC_TX_RX_SUSPENDED:
569 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
570 sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
571 return SCI_FAILURE_INVALID_STATE;
572 case SCI_RNC_AWAIT_SUSPENSION:
573 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
574 return SCI_SUCCESS;
575 default:
576 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
577 "%s: invalid state %d\n", __func__, state);
578 return SCI_FAILURE_INVALID_STATE;
579 }
580}
581
582enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
583 struct isci_request *ireq)
584{
585 enum scis_sds_remote_node_context_states state;
586
587 state = sci_rnc->sm.current_state_id;
588
589 switch (state) {
590 case SCI_RNC_READY:
591 return SCI_SUCCESS;
592 case SCI_RNC_TX_SUSPENDED:
593 case SCI_RNC_TX_RX_SUSPENDED:
594 case SCI_RNC_AWAIT_SUSPENSION:
595 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
596 "%s: invalid state %d\n", __func__, state);
597 return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
598 default:
599 break;
600 }
601 dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
602 "%s: requested to start IO while still resuming, %d\n",
603 __func__, state);
604 return SCI_FAILURE_INVALID_STATE;
605}
606
607enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_context *sci_rnc,
608 struct isci_request *ireq)
609{
610 enum scis_sds_remote_node_context_states state;
611
612 state = sci_rnc->sm.current_state_id;
613 switch (state) {
614 case SCI_RNC_RESUMING:
615 case SCI_RNC_READY:
616 case SCI_RNC_AWAIT_SUSPENSION:
617 return SCI_SUCCESS;
618 case SCI_RNC_TX_SUSPENDED:
619 case SCI_RNC_TX_RX_SUSPENDED:
620 sci_remote_node_context_resume(sci_rnc, NULL, NULL);
621 return SCI_SUCCESS;
622 default:
623 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
624 "%s: invalid state %d\n", __func__, state);
625 return SCI_FAILURE_INVALID_STATE;
626 }
627}
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-06 15:21:33 -0500