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 #undef C
64 #define C(a) (#a)
rnc_state_name(enum scis_sds_remote_node_context_states state)65 const char *rnc_state_name(enum scis_sds_remote_node_context_states state)
66 {
67 static const char * const strings[] = RNC_STATES;
68
69 return strings[state];
70 }
71 #undef C
72
73 /**
74 *
75 * @sci_rnc: The state of the remote node context object to check.
76 *
77 * This method will return true if the remote node context is in a READY state
78 * otherwise it will return false bool true if the remote node context is in
79 * the ready state. false if the remote node context is not in the ready state.
80 */
sci_remote_node_context_is_ready(struct sci_remote_node_context * sci_rnc)81 bool sci_remote_node_context_is_ready(
82 struct sci_remote_node_context *sci_rnc)
83 {
84 u32 current_state = sci_rnc->sm.current_state_id;
85
86 if (current_state == SCI_RNC_READY) {
87 return true;
88 }
89
90 return false;
91 }
92
sci_rnc_by_id(struct isci_host * ihost,u16 id)93 static union scu_remote_node_context *sci_rnc_by_id(struct isci_host *ihost, u16 id)
94 {
95 if (id < ihost->remote_node_entries &&
96 ihost->device_table[id])
97 return &ihost->remote_node_context_table[id];
98
99 return NULL;
100 }
101
sci_remote_node_context_construct_buffer(struct sci_remote_node_context * sci_rnc)102 static void sci_remote_node_context_construct_buffer(struct sci_remote_node_context *sci_rnc)
103 {
104 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
105 struct domain_device *dev = idev->domain_dev;
106 int rni = sci_rnc->remote_node_index;
107 union scu_remote_node_context *rnc;
108 struct isci_host *ihost;
109 __le64 sas_addr;
110
111 ihost = idev->owning_port->owning_controller;
112 rnc = sci_rnc_by_id(ihost, rni);
113
114 memset(rnc, 0, sizeof(union scu_remote_node_context)
115 * sci_remote_device_node_count(idev));
116
117 rnc->ssp.remote_node_index = rni;
118 rnc->ssp.remote_node_port_width = idev->device_port_width;
119 rnc->ssp.logical_port_index = idev->owning_port->physical_port_index;
120
121 /* sas address is __be64, context ram format is __le64 */
122 sas_addr = cpu_to_le64(SAS_ADDR(dev->sas_addr));
123 rnc->ssp.remote_sas_address_hi = upper_32_bits(sas_addr);
124 rnc->ssp.remote_sas_address_lo = lower_32_bits(sas_addr);
125
126 rnc->ssp.nexus_loss_timer_enable = true;
127 rnc->ssp.check_bit = false;
128 rnc->ssp.is_valid = false;
129 rnc->ssp.is_remote_node_context = true;
130 rnc->ssp.function_number = 0;
131
132 rnc->ssp.arbitration_wait_time = 0;
133
134 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
135 rnc->ssp.connection_occupancy_timeout =
136 ihost->user_parameters.stp_max_occupancy_timeout;
137 rnc->ssp.connection_inactivity_timeout =
138 ihost->user_parameters.stp_inactivity_timeout;
139 } else {
140 rnc->ssp.connection_occupancy_timeout =
141 ihost->user_parameters.ssp_max_occupancy_timeout;
142 rnc->ssp.connection_inactivity_timeout =
143 ihost->user_parameters.ssp_inactivity_timeout;
144 }
145
146 rnc->ssp.initial_arbitration_wait_time = 0;
147
148 /* Open Address Frame Parameters */
149 rnc->ssp.oaf_connection_rate = idev->connection_rate;
150 rnc->ssp.oaf_features = 0;
151 rnc->ssp.oaf_source_zone_group = 0;
152 rnc->ssp.oaf_more_compatibility_features = 0;
153 }
154
155 /**
156 *
157 * @sci_rnc:
158 * @callback:
159 * @callback_parameter:
160 *
161 * This method will setup the remote node context object so it will transition
162 * to its ready state. If the remote node context is already setup to
163 * transition to its final state then this function does nothing. none
164 */
sci_remote_node_context_setup_to_resume(struct sci_remote_node_context * sci_rnc,scics_sds_remote_node_context_callback callback,void * callback_parameter)165 static void sci_remote_node_context_setup_to_resume(
166 struct sci_remote_node_context *sci_rnc,
167 scics_sds_remote_node_context_callback callback,
168 void *callback_parameter)
169 {
170 if (sci_rnc->destination_state != SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL) {
171 sci_rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY;
172 sci_rnc->user_callback = callback;
173 sci_rnc->user_cookie = callback_parameter;
174 }
175 }
176
sci_remote_node_context_setup_to_destory(struct sci_remote_node_context * sci_rnc,scics_sds_remote_node_context_callback callback,void * callback_parameter)177 static void sci_remote_node_context_setup_to_destory(
178 struct sci_remote_node_context *sci_rnc,
179 scics_sds_remote_node_context_callback callback,
180 void *callback_parameter)
181 {
182 sci_rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL;
183 sci_rnc->user_callback = callback;
184 sci_rnc->user_cookie = callback_parameter;
185 }
186
187 /**
188 *
189 *
190 * This method just calls the user callback function and then resets the
191 * callback.
192 */
sci_remote_node_context_notify_user(struct sci_remote_node_context * rnc)193 static void sci_remote_node_context_notify_user(
194 struct sci_remote_node_context *rnc)
195 {
196 if (rnc->user_callback != NULL) {
197 (*rnc->user_callback)(rnc->user_cookie);
198
199 rnc->user_callback = NULL;
200 rnc->user_cookie = NULL;
201 }
202 }
203
sci_remote_node_context_continue_state_transitions(struct sci_remote_node_context * rnc)204 static void sci_remote_node_context_continue_state_transitions(struct sci_remote_node_context *rnc)
205 {
206 if (rnc->destination_state == SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY)
207 sci_remote_node_context_resume(rnc, rnc->user_callback,
208 rnc->user_cookie);
209 }
210
sci_remote_node_context_validate_context_buffer(struct sci_remote_node_context * sci_rnc)211 static void sci_remote_node_context_validate_context_buffer(struct sci_remote_node_context *sci_rnc)
212 {
213 union scu_remote_node_context *rnc_buffer;
214 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
215 struct domain_device *dev = idev->domain_dev;
216 struct isci_host *ihost = idev->owning_port->owning_controller;
217
218 rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);
219
220 rnc_buffer->ssp.is_valid = true;
221
222 if (!idev->is_direct_attached &&
223 (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))) {
224 sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_96);
225 } else {
226 sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_32);
227
228 if (idev->is_direct_attached)
229 sci_port_setup_transports(idev->owning_port,
230 sci_rnc->remote_node_index);
231 }
232 }
233
sci_remote_node_context_invalidate_context_buffer(struct sci_remote_node_context * sci_rnc)234 static void sci_remote_node_context_invalidate_context_buffer(struct sci_remote_node_context *sci_rnc)
235 {
236 union scu_remote_node_context *rnc_buffer;
237 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
238 struct isci_host *ihost = idev->owning_port->owning_controller;
239
240 rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);
241
242 rnc_buffer->ssp.is_valid = false;
243
244 sci_remote_device_post_request(rnc_to_dev(sci_rnc),
245 SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE);
246 }
247
sci_remote_node_context_initial_state_enter(struct sci_base_state_machine * sm)248 static void sci_remote_node_context_initial_state_enter(struct sci_base_state_machine *sm)
249 {
250 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
251
252 /* Check to see if we have gotten back to the initial state because
253 * someone requested to destroy the remote node context object.
254 */
255 if (sm->previous_state_id == SCI_RNC_INVALIDATING) {
256 rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
257 sci_remote_node_context_notify_user(rnc);
258 }
259 }
260
sci_remote_node_context_posting_state_enter(struct sci_base_state_machine * sm)261 static void sci_remote_node_context_posting_state_enter(struct sci_base_state_machine *sm)
262 {
263 struct sci_remote_node_context *sci_rnc = container_of(sm, typeof(*sci_rnc), sm);
264
265 sci_remote_node_context_validate_context_buffer(sci_rnc);
266 }
267
sci_remote_node_context_invalidating_state_enter(struct sci_base_state_machine * sm)268 static void sci_remote_node_context_invalidating_state_enter(struct sci_base_state_machine *sm)
269 {
270 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
271
272 sci_remote_node_context_invalidate_context_buffer(rnc);
273 }
274
sci_remote_node_context_resuming_state_enter(struct sci_base_state_machine * sm)275 static void sci_remote_node_context_resuming_state_enter(struct sci_base_state_machine *sm)
276 {
277 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
278 struct isci_remote_device *idev;
279 struct domain_device *dev;
280
281 idev = rnc_to_dev(rnc);
282 dev = idev->domain_dev;
283
284 /*
285 * For direct attached SATA devices we need to clear the TLCR
286 * NCQ to TCi tag mapping on the phy and in cases where we
287 * resume because of a target reset we also need to update
288 * the STPTLDARNI register with the RNi of the device
289 */
290 if ((dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) &&
291 idev->is_direct_attached)
292 sci_port_setup_transports(idev->owning_port,
293 rnc->remote_node_index);
294
295 sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_RESUME);
296 }
297
sci_remote_node_context_ready_state_enter(struct sci_base_state_machine * sm)298 static void sci_remote_node_context_ready_state_enter(struct sci_base_state_machine *sm)
299 {
300 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
301
302 rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
303
304 if (rnc->user_callback)
305 sci_remote_node_context_notify_user(rnc);
306 }
307
sci_remote_node_context_tx_suspended_state_enter(struct sci_base_state_machine * sm)308 static void sci_remote_node_context_tx_suspended_state_enter(struct sci_base_state_machine *sm)
309 {
310 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
311
312 sci_remote_node_context_continue_state_transitions(rnc);
313 }
314
sci_remote_node_context_tx_rx_suspended_state_enter(struct sci_base_state_machine * sm)315 static void sci_remote_node_context_tx_rx_suspended_state_enter(struct sci_base_state_machine *sm)
316 {
317 struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
318
319 sci_remote_node_context_continue_state_transitions(rnc);
320 }
321
322 static const struct sci_base_state sci_remote_node_context_state_table[] = {
323 [SCI_RNC_INITIAL] = {
324 .enter_state = sci_remote_node_context_initial_state_enter,
325 },
326 [SCI_RNC_POSTING] = {
327 .enter_state = sci_remote_node_context_posting_state_enter,
328 },
329 [SCI_RNC_INVALIDATING] = {
330 .enter_state = sci_remote_node_context_invalidating_state_enter,
331 },
332 [SCI_RNC_RESUMING] = {
333 .enter_state = sci_remote_node_context_resuming_state_enter,
334 },
335 [SCI_RNC_READY] = {
336 .enter_state = sci_remote_node_context_ready_state_enter,
337 },
338 [SCI_RNC_TX_SUSPENDED] = {
339 .enter_state = sci_remote_node_context_tx_suspended_state_enter,
340 },
341 [SCI_RNC_TX_RX_SUSPENDED] = {
342 .enter_state = sci_remote_node_context_tx_rx_suspended_state_enter,
343 },
344 [SCI_RNC_AWAIT_SUSPENSION] = { },
345 };
346
sci_remote_node_context_construct(struct sci_remote_node_context * rnc,u16 remote_node_index)347 void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
348 u16 remote_node_index)
349 {
350 memset(rnc, 0, sizeof(struct sci_remote_node_context));
351
352 rnc->remote_node_index = remote_node_index;
353 rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
354
355 sci_init_sm(&rnc->sm, sci_remote_node_context_state_table, SCI_RNC_INITIAL);
356 }
357
sci_remote_node_context_event_handler(struct sci_remote_node_context * sci_rnc,u32 event_code)358 enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
359 u32 event_code)
360 {
361 enum scis_sds_remote_node_context_states state;
362
363 state = sci_rnc->sm.current_state_id;
364 switch (state) {
365 case SCI_RNC_POSTING:
366 switch (scu_get_event_code(event_code)) {
367 case SCU_EVENT_POST_RNC_COMPLETE:
368 sci_change_state(&sci_rnc->sm, SCI_RNC_READY);
369 break;
370 default:
371 goto out;
372 }
373 break;
374 case SCI_RNC_INVALIDATING:
375 if (scu_get_event_code(event_code) == SCU_EVENT_POST_RNC_INVALIDATE_COMPLETE) {
376 if (sci_rnc->destination_state == SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL)
377 state = SCI_RNC_INITIAL;
378 else
379 state = SCI_RNC_POSTING;
380 sci_change_state(&sci_rnc->sm, state);
381 } else {
382 switch (scu_get_event_type(event_code)) {
383 case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
384 case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
385 /* We really dont care if the hardware is going to suspend
386 * the device since it's being invalidated anyway */
387 dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
388 "%s: SCIC Remote Node Context 0x%p was "
389 "suspeneded by hardware while being "
390 "invalidated.\n", __func__, sci_rnc);
391 break;
392 default:
393 goto out;
394 }
395 }
396 break;
397 case SCI_RNC_RESUMING:
398 if (scu_get_event_code(event_code) == SCU_EVENT_POST_RCN_RELEASE) {
399 sci_change_state(&sci_rnc->sm, SCI_RNC_READY);
400 } else {
401 switch (scu_get_event_type(event_code)) {
402 case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
403 case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
404 /* We really dont care if the hardware is going to suspend
405 * the device since it's being resumed anyway */
406 dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
407 "%s: SCIC Remote Node Context 0x%p was "
408 "suspeneded by hardware while being resumed.\n",
409 __func__, sci_rnc);
410 break;
411 default:
412 goto out;
413 }
414 }
415 break;
416 case SCI_RNC_READY:
417 switch (scu_get_event_type(event_code)) {
418 case SCU_EVENT_TL_RNC_SUSPEND_TX:
419 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_SUSPENDED);
420 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
421 break;
422 case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
423 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
424 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
425 break;
426 default:
427 goto out;
428 }
429 break;
430 case SCI_RNC_AWAIT_SUSPENSION:
431 switch (scu_get_event_type(event_code)) {
432 case SCU_EVENT_TL_RNC_SUSPEND_TX:
433 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_SUSPENDED);
434 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
435 break;
436 case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
437 sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
438 sci_rnc->suspension_code = scu_get_event_specifier(event_code);
439 break;
440 default:
441 goto out;
442 }
443 break;
444 default:
445 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
446 "%s: invalid state %d\n", __func__, state);
447 return SCI_FAILURE_INVALID_STATE;
448 }
449 return SCI_SUCCESS;
450
451 out:
452 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
453 "%s: code: %#x state: %d\n", __func__, event_code, state);
454 return SCI_FAILURE;
455
456 }
457
sci_remote_node_context_destruct(struct sci_remote_node_context * sci_rnc,scics_sds_remote_node_context_callback cb_fn,void * cb_p)458 enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
459 scics_sds_remote_node_context_callback cb_fn,
460 void *cb_p)
461 {
462 enum scis_sds_remote_node_context_states state;
463
464 state = sci_rnc->sm.current_state_id;
465 switch (state) {
466 case SCI_RNC_INVALIDATING:
467 sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
468 return SCI_SUCCESS;
469 case SCI_RNC_POSTING:
470 case SCI_RNC_RESUMING:
471 case SCI_RNC_READY:
472 case SCI_RNC_TX_SUSPENDED:
473 case SCI_RNC_TX_RX_SUSPENDED:
474 case SCI_RNC_AWAIT_SUSPENSION:
475 sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
476 sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
477 return SCI_SUCCESS;
478 case SCI_RNC_INITIAL:
479 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
480 "%s: invalid state %d\n", __func__, state);
481 /* We have decided that the destruct request on the remote node context
482 * can not fail since it is either in the initial/destroyed state or is
483 * can be destroyed.
484 */
485 return SCI_SUCCESS;
486 default:
487 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
488 "%s: invalid state %d\n", __func__, state);
489 return SCI_FAILURE_INVALID_STATE;
490 }
491 }
492
sci_remote_node_context_suspend(struct sci_remote_node_context * sci_rnc,u32 suspend_type,scics_sds_remote_node_context_callback cb_fn,void * cb_p)493 enum sci_status sci_remote_node_context_suspend(struct sci_remote_node_context *sci_rnc,
494 u32 suspend_type,
495 scics_sds_remote_node_context_callback cb_fn,
496 void *cb_p)
497 {
498 enum scis_sds_remote_node_context_states state;
499
500 state = sci_rnc->sm.current_state_id;
501 if (state != SCI_RNC_READY) {
502 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
503 "%s: invalid state %d\n", __func__, state);
504 return SCI_FAILURE_INVALID_STATE;
505 }
506
507 sci_rnc->user_callback = cb_fn;
508 sci_rnc->user_cookie = cb_p;
509 sci_rnc->suspension_code = suspend_type;
510
511 if (suspend_type == SCI_SOFTWARE_SUSPENSION) {
512 sci_remote_device_post_request(rnc_to_dev(sci_rnc),
513 SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX);
514 }
515
516 sci_change_state(&sci_rnc->sm, SCI_RNC_AWAIT_SUSPENSION);
517 return SCI_SUCCESS;
518 }
519
sci_remote_node_context_resume(struct sci_remote_node_context * sci_rnc,scics_sds_remote_node_context_callback cb_fn,void * cb_p)520 enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
521 scics_sds_remote_node_context_callback cb_fn,
522 void *cb_p)
523 {
524 enum scis_sds_remote_node_context_states state;
525
526 state = sci_rnc->sm.current_state_id;
527 switch (state) {
528 case SCI_RNC_INITIAL:
529 if (sci_rnc->remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
530 return SCI_FAILURE_INVALID_STATE;
531
532 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
533 sci_remote_node_context_construct_buffer(sci_rnc);
534 sci_change_state(&sci_rnc->sm, SCI_RNC_POSTING);
535 return SCI_SUCCESS;
536 case SCI_RNC_POSTING:
537 case SCI_RNC_INVALIDATING:
538 case SCI_RNC_RESUMING:
539 if (sci_rnc->destination_state != SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY)
540 return SCI_FAILURE_INVALID_STATE;
541
542 sci_rnc->user_callback = cb_fn;
543 sci_rnc->user_cookie = cb_p;
544 return SCI_SUCCESS;
545 case SCI_RNC_TX_SUSPENDED: {
546 struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
547 struct domain_device *dev = idev->domain_dev;
548
549 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
550
551 /* TODO: consider adding a resume action of NONE, INVALIDATE, WRITE_TLCR */
552 if (dev->dev_type == SAS_END_DEV || dev_is_expander(dev))
553 sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
554 else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
555 if (idev->is_direct_attached) {
556 /* @todo Fix this since I am being silly in writing to the STPTLDARNI register. */
557 sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
558 } else {
559 sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
560 }
561 } else
562 return SCI_FAILURE;
563 return SCI_SUCCESS;
564 }
565 case SCI_RNC_TX_RX_SUSPENDED:
566 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
567 sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
568 return SCI_FAILURE_INVALID_STATE;
569 case SCI_RNC_AWAIT_SUSPENSION:
570 sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
571 return SCI_SUCCESS;
572 default:
573 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
574 "%s: invalid state %d\n", __func__, state);
575 return SCI_FAILURE_INVALID_STATE;
576 }
577 }
578
sci_remote_node_context_start_io(struct sci_remote_node_context * sci_rnc,struct isci_request * ireq)579 enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
580 struct isci_request *ireq)
581 {
582 enum scis_sds_remote_node_context_states state;
583
584 state = sci_rnc->sm.current_state_id;
585
586 switch (state) {
587 case SCI_RNC_READY:
588 return SCI_SUCCESS;
589 case SCI_RNC_TX_SUSPENDED:
590 case SCI_RNC_TX_RX_SUSPENDED:
591 case SCI_RNC_AWAIT_SUSPENSION:
592 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
593 "%s: invalid state %d\n", __func__, state);
594 return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
595 default:
596 break;
597 }
598 dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
599 "%s: requested to start IO while still resuming, %d\n",
600 __func__, state);
601 return SCI_FAILURE_INVALID_STATE;
602 }
603
sci_remote_node_context_start_task(struct sci_remote_node_context * sci_rnc,struct isci_request * ireq)604 enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_context *sci_rnc,
605 struct isci_request *ireq)
606 {
607 enum scis_sds_remote_node_context_states state;
608
609 state = sci_rnc->sm.current_state_id;
610 switch (state) {
611 case SCI_RNC_RESUMING:
612 case SCI_RNC_READY:
613 case SCI_RNC_AWAIT_SUSPENSION:
614 return SCI_SUCCESS;
615 case SCI_RNC_TX_SUSPENDED:
616 case SCI_RNC_TX_RX_SUSPENDED:
617 sci_remote_node_context_resume(sci_rnc, NULL, NULL);
618 return SCI_SUCCESS;
619 default:
620 dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
621 "%s: invalid state %d\n", __func__, state);
622 return SCI_FAILURE_INVALID_STATE;
623 }
624 }
625