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1/*
2 * Serial Attached SCSI (SAS) Transport Layer initialization
3 *
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6 *
7 * This file is licensed under GPLv2.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/init.h>
29#include <linux/device.h>
30#include <linux/spinlock.h>
31#include <scsi/sas_ata.h>
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_transport.h>
35#include <scsi/scsi_transport_sas.h>
36
37#include "sas_internal.h"
38
39#include "../scsi_sas_internal.h"
40
41static struct kmem_cache *sas_task_cache;
42
43struct sas_task *sas_alloc_task(gfp_t flags)
44{
45 struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
46
47 if (task) {
48 spin_lock_init(&task->task_state_lock);
49 task->task_state_flags = SAS_TASK_STATE_PENDING;
50 }
51
52 return task;
53}
54EXPORT_SYMBOL_GPL(sas_alloc_task);
55
56struct sas_task *sas_alloc_slow_task(gfp_t flags)
57{
58 struct sas_task *task = sas_alloc_task(flags);
59 struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
60
61 if (!task || !slow) {
62 if (task)
63 kmem_cache_free(sas_task_cache, task);
64 kfree(slow);
65 return NULL;
66 }
67
68 task->slow_task = slow;
69 init_timer(&slow->timer);
70 init_completion(&slow->completion);
71
72 return task;
73}
74EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
75
76void sas_free_task(struct sas_task *task)
77{
78 if (task) {
79 kfree(task->slow_task);
80 kmem_cache_free(sas_task_cache, task);
81 }
82}
83EXPORT_SYMBOL_GPL(sas_free_task);
84
85/*------------ SAS addr hash -----------*/
86void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
87{
88 const u32 poly = 0x00DB2777;
89 u32 r = 0;
90 int i;
91
92 for (i = 0; i < 8; i++) {
93 int b;
94 for (b = 7; b >= 0; b--) {
95 r <<= 1;
96 if ((1 << b) & sas_addr[i]) {
97 if (!(r & 0x01000000))
98 r ^= poly;
99 } else if (r & 0x01000000)
100 r ^= poly;
101 }
102 }
103
104 hashed[0] = (r >> 16) & 0xFF;
105 hashed[1] = (r >> 8) & 0xFF ;
106 hashed[2] = r & 0xFF;
107}
108
109
110/* ---------- HA events ---------- */
111
112void sas_hae_reset(struct work_struct *work)
113{
114 struct sas_ha_event *ev = to_sas_ha_event(work);
115 struct sas_ha_struct *ha = ev->ha;
116
117 clear_bit(HAE_RESET, &ha->pending);
118}
119
120int sas_register_ha(struct sas_ha_struct *sas_ha)
121{
122 int error = 0;
123
124 mutex_init(&sas_ha->disco_mutex);
125 spin_lock_init(&sas_ha->phy_port_lock);
126 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
127
128 set_bit(SAS_HA_REGISTERED, &sas_ha->state);
129 spin_lock_init(&sas_ha->lock);
130 mutex_init(&sas_ha->drain_mutex);
131 init_waitqueue_head(&sas_ha->eh_wait_q);
132 INIT_LIST_HEAD(&sas_ha->defer_q);
133 INIT_LIST_HEAD(&sas_ha->eh_dev_q);
134
135 error = sas_register_phys(sas_ha);
136 if (error) {
137 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
138 return error;
139 }
140
141 error = sas_register_ports(sas_ha);
142 if (error) {
143 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
144 goto Undo_phys;
145 }
146
147 error = sas_init_events(sas_ha);
148 if (error) {
149 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
150 goto Undo_ports;
151 }
152
153 INIT_LIST_HEAD(&sas_ha->eh_done_q);
154 INIT_LIST_HEAD(&sas_ha->eh_ata_q);
155
156 return 0;
157
158Undo_ports:
159 sas_unregister_ports(sas_ha);
160Undo_phys:
161
162 return error;
163}
164
165static void sas_disable_events(struct sas_ha_struct *sas_ha)
166{
167 /* Set the state to unregistered to avoid further unchained
168 * events to be queued, and flush any in-progress drainers
169 */
170 mutex_lock(&sas_ha->drain_mutex);
171 spin_lock_irq(&sas_ha->lock);
172 clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
173 spin_unlock_irq(&sas_ha->lock);
174 __sas_drain_work(sas_ha);
175 mutex_unlock(&sas_ha->drain_mutex);
176}
177
178int sas_unregister_ha(struct sas_ha_struct *sas_ha)
179{
180 sas_disable_events(sas_ha);
181 sas_unregister_ports(sas_ha);
182
183 /* flush unregistration work */
184 mutex_lock(&sas_ha->drain_mutex);
185 __sas_drain_work(sas_ha);
186 mutex_unlock(&sas_ha->drain_mutex);
187
188 return 0;
189}
190
191static int sas_get_linkerrors(struct sas_phy *phy)
192{
193 if (scsi_is_sas_phy_local(phy)) {
194 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
195 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
196 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
197 struct sas_internal *i =
198 to_sas_internal(sas_ha->core.shost->transportt);
199
200 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
201 }
202
203 return sas_smp_get_phy_events(phy);
204}
205
206int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
207{
208 struct domain_device *dev = NULL;
209
210 /* try to route user requested link resets through libata */
211 if (asd_phy->port)
212 dev = asd_phy->port->port_dev;
213
214 /* validate that dev has been probed */
215 if (dev)
216 dev = sas_find_dev_by_rphy(dev->rphy);
217
218 if (dev && dev_is_sata(dev)) {
219 sas_ata_schedule_reset(dev);
220 sas_ata_wait_eh(dev);
221 return 0;
222 }
223
224 return -ENODEV;
225}
226
227/**
228 * transport_sas_phy_reset - reset a phy and permit libata to manage the link
229 *
230 * phy reset request via sysfs in host workqueue context so we know we
231 * can block on eh and safely traverse the domain_device topology
232 */
233static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
234{
235 enum phy_func reset_type;
236
237 if (hard_reset)
238 reset_type = PHY_FUNC_HARD_RESET;
239 else
240 reset_type = PHY_FUNC_LINK_RESET;
241
242 if (scsi_is_sas_phy_local(phy)) {
243 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
244 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
245 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
246 struct sas_internal *i =
247 to_sas_internal(sas_ha->core.shost->transportt);
248
249 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
250 return 0;
251 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
252 } else {
253 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
254 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
255 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
256
257 if (ata_dev && !hard_reset) {
258 sas_ata_schedule_reset(ata_dev);
259 sas_ata_wait_eh(ata_dev);
260 return 0;
261 } else
262 return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
263 }
264}
265
266static int sas_phy_enable(struct sas_phy *phy, int enable)
267{
268 int ret;
269 enum phy_func cmd;
270
271 if (enable)
272 cmd = PHY_FUNC_LINK_RESET;
273 else
274 cmd = PHY_FUNC_DISABLE;
275
276 if (scsi_is_sas_phy_local(phy)) {
277 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
278 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
279 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
280 struct sas_internal *i =
281 to_sas_internal(sas_ha->core.shost->transportt);
282
283 if (enable)
284 ret = transport_sas_phy_reset(phy, 0);
285 else
286 ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
287 } else {
288 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
289 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
290
291 if (enable)
292 ret = transport_sas_phy_reset(phy, 0);
293 else
294 ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
295 }
296 return ret;
297}
298
299int sas_phy_reset(struct sas_phy *phy, int hard_reset)
300{
301 int ret;
302 enum phy_func reset_type;
303
304 if (!phy->enabled)
305 return -ENODEV;
306
307 if (hard_reset)
308 reset_type = PHY_FUNC_HARD_RESET;
309 else
310 reset_type = PHY_FUNC_LINK_RESET;
311
312 if (scsi_is_sas_phy_local(phy)) {
313 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
314 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
315 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
316 struct sas_internal *i =
317 to_sas_internal(sas_ha->core.shost->transportt);
318
319 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
320 } else {
321 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
322 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
323 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
324 }
325 return ret;
326}
327
328int sas_set_phy_speed(struct sas_phy *phy,
329 struct sas_phy_linkrates *rates)
330{
331 int ret;
332
333 if ((rates->minimum_linkrate &&
334 rates->minimum_linkrate > phy->maximum_linkrate) ||
335 (rates->maximum_linkrate &&
336 rates->maximum_linkrate < phy->minimum_linkrate))
337 return -EINVAL;
338
339 if (rates->minimum_linkrate &&
340 rates->minimum_linkrate < phy->minimum_linkrate_hw)
341 rates->minimum_linkrate = phy->minimum_linkrate_hw;
342
343 if (rates->maximum_linkrate &&
344 rates->maximum_linkrate > phy->maximum_linkrate_hw)
345 rates->maximum_linkrate = phy->maximum_linkrate_hw;
346
347 if (scsi_is_sas_phy_local(phy)) {
348 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
349 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
350 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
351 struct sas_internal *i =
352 to_sas_internal(sas_ha->core.shost->transportt);
353
354 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
355 rates);
356 } else {
357 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
358 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
359 ret = sas_smp_phy_control(ddev, phy->number,
360 PHY_FUNC_LINK_RESET, rates);
361
362 }
363
364 return ret;
365}
366
367void sas_prep_resume_ha(struct sas_ha_struct *ha)
368{
369 int i;
370
371 set_bit(SAS_HA_REGISTERED, &ha->state);
372
373 /* clear out any stale link events/data from the suspension path */
374 for (i = 0; i < ha->num_phys; i++) {
375 struct asd_sas_phy *phy = ha->sas_phy[i];
376
377 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
378 phy->port_events_pending = 0;
379 phy->phy_events_pending = 0;
380 phy->frame_rcvd_size = 0;
381 }
382}
383EXPORT_SYMBOL(sas_prep_resume_ha);
384
385static int phys_suspended(struct sas_ha_struct *ha)
386{
387 int i, rc = 0;
388
389 for (i = 0; i < ha->num_phys; i++) {
390 struct asd_sas_phy *phy = ha->sas_phy[i];
391
392 if (phy->suspended)
393 rc++;
394 }
395
396 return rc;
397}
398
399void sas_resume_ha(struct sas_ha_struct *ha)
400{
401 const unsigned long tmo = msecs_to_jiffies(25000);
402 int i;
403
404 /* deform ports on phys that did not resume
405 * at this point we may be racing the phy coming back (as posted
406 * by the lldd). So we post the event and once we are in the
407 * libsas context check that the phy remains suspended before
408 * tearing it down.
409 */
410 i = phys_suspended(ha);
411 if (i)
412 dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
413 i, i > 1 ? "s" : "");
414 wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
415 for (i = 0; i < ha->num_phys; i++) {
416 struct asd_sas_phy *phy = ha->sas_phy[i];
417
418 if (phy->suspended) {
419 dev_warn(&phy->phy->dev, "resume timeout\n");
420 sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
421 }
422 }
423
424 /* all phys are back up or timed out, turn on i/o so we can
425 * flush out disks that did not return
426 */
427 scsi_unblock_requests(ha->core.shost);
428 sas_drain_work(ha);
429}
430EXPORT_SYMBOL(sas_resume_ha);
431
432void sas_suspend_ha(struct sas_ha_struct *ha)
433{
434 int i;
435
436 sas_disable_events(ha);
437 scsi_block_requests(ha->core.shost);
438 for (i = 0; i < ha->num_phys; i++) {
439 struct asd_sas_port *port = ha->sas_port[i];
440
441 sas_discover_event(port, DISCE_SUSPEND);
442 }
443
444 /* flush suspend events while unregistered */
445 mutex_lock(&ha->drain_mutex);
446 __sas_drain_work(ha);
447 mutex_unlock(&ha->drain_mutex);
448}
449EXPORT_SYMBOL(sas_suspend_ha);
450
451static void sas_phy_release(struct sas_phy *phy)
452{
453 kfree(phy->hostdata);
454 phy->hostdata = NULL;
455}
456
457static void phy_reset_work(struct work_struct *work)
458{
459 struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
460
461 d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
462}
463
464static void phy_enable_work(struct work_struct *work)
465{
466 struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
467
468 d->enable_result = sas_phy_enable(d->phy, d->enable);
469}
470
471static int sas_phy_setup(struct sas_phy *phy)
472{
473 struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
474
475 if (!d)
476 return -ENOMEM;
477
478 mutex_init(&d->event_lock);
479 INIT_SAS_WORK(&d->reset_work, phy_reset_work);
480 INIT_SAS_WORK(&d->enable_work, phy_enable_work);
481 d->phy = phy;
482 phy->hostdata = d;
483
484 return 0;
485}
486
487static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
488{
489 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
490 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
491 struct sas_phy_data *d = phy->hostdata;
492 int rc;
493
494 if (!d)
495 return -ENOMEM;
496
497 /* libsas workqueue coordinates ata-eh reset with discovery */
498 mutex_lock(&d->event_lock);
499 d->reset_result = 0;
500 d->hard_reset = hard_reset;
501
502 spin_lock_irq(&ha->lock);
503 sas_queue_work(ha, &d->reset_work);
504 spin_unlock_irq(&ha->lock);
505
506 rc = sas_drain_work(ha);
507 if (rc == 0)
508 rc = d->reset_result;
509 mutex_unlock(&d->event_lock);
510
511 return rc;
512}
513
514static int queue_phy_enable(struct sas_phy *phy, int enable)
515{
516 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
517 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
518 struct sas_phy_data *d = phy->hostdata;
519 int rc;
520
521 if (!d)
522 return -ENOMEM;
523
524 /* libsas workqueue coordinates ata-eh reset with discovery */
525 mutex_lock(&d->event_lock);
526 d->enable_result = 0;
527 d->enable = enable;
528
529 spin_lock_irq(&ha->lock);
530 sas_queue_work(ha, &d->enable_work);
531 spin_unlock_irq(&ha->lock);
532
533 rc = sas_drain_work(ha);
534 if (rc == 0)
535 rc = d->enable_result;
536 mutex_unlock(&d->event_lock);
537
538 return rc;
539}
540
541static struct sas_function_template sft = {
542 .phy_enable = queue_phy_enable,
543 .phy_reset = queue_phy_reset,
544 .phy_setup = sas_phy_setup,
545 .phy_release = sas_phy_release,
546 .set_phy_speed = sas_set_phy_speed,
547 .get_linkerrors = sas_get_linkerrors,
548 .smp_handler = sas_smp_handler,
549};
550
551struct scsi_transport_template *
552sas_domain_attach_transport(struct sas_domain_function_template *dft)
553{
554 struct scsi_transport_template *stt = sas_attach_transport(&sft);
555 struct sas_internal *i;
556
557 if (!stt)
558 return stt;
559
560 i = to_sas_internal(stt);
561 i->dft = dft;
562 stt->create_work_queue = 1;
563 stt->eh_timed_out = sas_scsi_timed_out;
564 stt->eh_strategy_handler = sas_scsi_recover_host;
565
566 return stt;
567}
568EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
569
570
571void sas_domain_release_transport(struct scsi_transport_template *stt)
572{
573 sas_release_transport(stt);
574}
575EXPORT_SYMBOL_GPL(sas_domain_release_transport);
576
577/* ---------- SAS Class register/unregister ---------- */
578
579static int __init sas_class_init(void)
580{
581 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
582 if (!sas_task_cache)
583 return -ENOMEM;
584
585 return 0;
586}
587
588static void __exit sas_class_exit(void)
589{
590 kmem_cache_destroy(sas_task_cache);
591}
592
593MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
594MODULE_DESCRIPTION("SAS Transport Layer");
595MODULE_LICENSE("GPL v2");
596
597module_init(sas_class_init);
598module_exit(sas_class_exit);
599
600EXPORT_SYMBOL_GPL(sas_register_ha);
601EXPORT_SYMBOL_GPL(sas_unregister_ha);
1/*
2 * Serial Attached SCSI (SAS) Transport Layer initialization
3 *
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6 *
7 * This file is licensed under GPLv2.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/init.h>
29#include <linux/device.h>
30#include <linux/spinlock.h>
31#include <scsi/sas_ata.h>
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_transport.h>
35#include <scsi/scsi_transport_sas.h>
36
37#include "sas_internal.h"
38
39#include "../scsi_sas_internal.h"
40
41static struct kmem_cache *sas_task_cache;
42
43struct sas_task *sas_alloc_task(gfp_t flags)
44{
45 struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
46
47 if (task) {
48 INIT_LIST_HEAD(&task->list);
49 spin_lock_init(&task->task_state_lock);
50 task->task_state_flags = SAS_TASK_STATE_PENDING;
51 }
52
53 return task;
54}
55EXPORT_SYMBOL_GPL(sas_alloc_task);
56
57struct sas_task *sas_alloc_slow_task(gfp_t flags)
58{
59 struct sas_task *task = sas_alloc_task(flags);
60 struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
61
62 if (!task || !slow) {
63 if (task)
64 kmem_cache_free(sas_task_cache, task);
65 kfree(slow);
66 return NULL;
67 }
68
69 task->slow_task = slow;
70 init_timer(&slow->timer);
71 init_completion(&slow->completion);
72
73 return task;
74}
75EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
76
77void sas_free_task(struct sas_task *task)
78{
79 if (task) {
80 BUG_ON(!list_empty(&task->list));
81 kfree(task->slow_task);
82 kmem_cache_free(sas_task_cache, task);
83 }
84}
85EXPORT_SYMBOL_GPL(sas_free_task);
86
87/*------------ SAS addr hash -----------*/
88void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
89{
90 const u32 poly = 0x00DB2777;
91 u32 r = 0;
92 int i;
93
94 for (i = 0; i < 8; i++) {
95 int b;
96 for (b = 7; b >= 0; b--) {
97 r <<= 1;
98 if ((1 << b) & sas_addr[i]) {
99 if (!(r & 0x01000000))
100 r ^= poly;
101 } else if (r & 0x01000000)
102 r ^= poly;
103 }
104 }
105
106 hashed[0] = (r >> 16) & 0xFF;
107 hashed[1] = (r >> 8) & 0xFF ;
108 hashed[2] = r & 0xFF;
109}
110
111
112/* ---------- HA events ---------- */
113
114void sas_hae_reset(struct work_struct *work)
115{
116 struct sas_ha_event *ev = to_sas_ha_event(work);
117 struct sas_ha_struct *ha = ev->ha;
118
119 clear_bit(HAE_RESET, &ha->pending);
120}
121
122int sas_register_ha(struct sas_ha_struct *sas_ha)
123{
124 int error = 0;
125
126 mutex_init(&sas_ha->disco_mutex);
127 spin_lock_init(&sas_ha->phy_port_lock);
128 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
129
130 if (sas_ha->lldd_queue_size == 0)
131 sas_ha->lldd_queue_size = 1;
132 else if (sas_ha->lldd_queue_size == -1)
133 sas_ha->lldd_queue_size = 128; /* Sanity */
134
135 set_bit(SAS_HA_REGISTERED, &sas_ha->state);
136 spin_lock_init(&sas_ha->lock);
137 mutex_init(&sas_ha->drain_mutex);
138 init_waitqueue_head(&sas_ha->eh_wait_q);
139 INIT_LIST_HEAD(&sas_ha->defer_q);
140 INIT_LIST_HEAD(&sas_ha->eh_dev_q);
141
142 error = sas_register_phys(sas_ha);
143 if (error) {
144 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
145 return error;
146 }
147
148 error = sas_register_ports(sas_ha);
149 if (error) {
150 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
151 goto Undo_phys;
152 }
153
154 error = sas_init_events(sas_ha);
155 if (error) {
156 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
157 goto Undo_ports;
158 }
159
160 if (sas_ha->lldd_max_execute_num > 1) {
161 error = sas_init_queue(sas_ha);
162 if (error) {
163 printk(KERN_NOTICE "couldn't start queue thread:%d, "
164 "running in direct mode\n", error);
165 sas_ha->lldd_max_execute_num = 1;
166 }
167 }
168
169 INIT_LIST_HEAD(&sas_ha->eh_done_q);
170 INIT_LIST_HEAD(&sas_ha->eh_ata_q);
171
172 return 0;
173
174Undo_ports:
175 sas_unregister_ports(sas_ha);
176Undo_phys:
177
178 return error;
179}
180
181static void sas_disable_events(struct sas_ha_struct *sas_ha)
182{
183 /* Set the state to unregistered to avoid further unchained
184 * events to be queued, and flush any in-progress drainers
185 */
186 mutex_lock(&sas_ha->drain_mutex);
187 spin_lock_irq(&sas_ha->lock);
188 clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
189 spin_unlock_irq(&sas_ha->lock);
190 __sas_drain_work(sas_ha);
191 mutex_unlock(&sas_ha->drain_mutex);
192}
193
194int sas_unregister_ha(struct sas_ha_struct *sas_ha)
195{
196 sas_disable_events(sas_ha);
197 sas_unregister_ports(sas_ha);
198
199 /* flush unregistration work */
200 mutex_lock(&sas_ha->drain_mutex);
201 __sas_drain_work(sas_ha);
202 mutex_unlock(&sas_ha->drain_mutex);
203
204 if (sas_ha->lldd_max_execute_num > 1) {
205 sas_shutdown_queue(sas_ha);
206 sas_ha->lldd_max_execute_num = 1;
207 }
208
209 return 0;
210}
211
212static int sas_get_linkerrors(struct sas_phy *phy)
213{
214 if (scsi_is_sas_phy_local(phy)) {
215 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
216 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
217 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
218 struct sas_internal *i =
219 to_sas_internal(sas_ha->core.shost->transportt);
220
221 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
222 }
223
224 return sas_smp_get_phy_events(phy);
225}
226
227int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
228{
229 struct domain_device *dev = NULL;
230
231 /* try to route user requested link resets through libata */
232 if (asd_phy->port)
233 dev = asd_phy->port->port_dev;
234
235 /* validate that dev has been probed */
236 if (dev)
237 dev = sas_find_dev_by_rphy(dev->rphy);
238
239 if (dev && dev_is_sata(dev)) {
240 sas_ata_schedule_reset(dev);
241 sas_ata_wait_eh(dev);
242 return 0;
243 }
244
245 return -ENODEV;
246}
247
248/**
249 * transport_sas_phy_reset - reset a phy and permit libata to manage the link
250 *
251 * phy reset request via sysfs in host workqueue context so we know we
252 * can block on eh and safely traverse the domain_device topology
253 */
254static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
255{
256 enum phy_func reset_type;
257
258 if (hard_reset)
259 reset_type = PHY_FUNC_HARD_RESET;
260 else
261 reset_type = PHY_FUNC_LINK_RESET;
262
263 if (scsi_is_sas_phy_local(phy)) {
264 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
265 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
266 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
267 struct sas_internal *i =
268 to_sas_internal(sas_ha->core.shost->transportt);
269
270 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
271 return 0;
272 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
273 } else {
274 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
275 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
276 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
277
278 if (ata_dev && !hard_reset) {
279 sas_ata_schedule_reset(ata_dev);
280 sas_ata_wait_eh(ata_dev);
281 return 0;
282 } else
283 return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
284 }
285}
286
287static int sas_phy_enable(struct sas_phy *phy, int enable)
288{
289 int ret;
290 enum phy_func cmd;
291
292 if (enable)
293 cmd = PHY_FUNC_LINK_RESET;
294 else
295 cmd = PHY_FUNC_DISABLE;
296
297 if (scsi_is_sas_phy_local(phy)) {
298 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
299 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
300 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
301 struct sas_internal *i =
302 to_sas_internal(sas_ha->core.shost->transportt);
303
304 if (enable)
305 ret = transport_sas_phy_reset(phy, 0);
306 else
307 ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
308 } else {
309 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
310 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
311
312 if (enable)
313 ret = transport_sas_phy_reset(phy, 0);
314 else
315 ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
316 }
317 return ret;
318}
319
320int sas_phy_reset(struct sas_phy *phy, int hard_reset)
321{
322 int ret;
323 enum phy_func reset_type;
324
325 if (!phy->enabled)
326 return -ENODEV;
327
328 if (hard_reset)
329 reset_type = PHY_FUNC_HARD_RESET;
330 else
331 reset_type = PHY_FUNC_LINK_RESET;
332
333 if (scsi_is_sas_phy_local(phy)) {
334 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
335 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
336 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
337 struct sas_internal *i =
338 to_sas_internal(sas_ha->core.shost->transportt);
339
340 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
341 } else {
342 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
343 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
344 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
345 }
346 return ret;
347}
348
349int sas_set_phy_speed(struct sas_phy *phy,
350 struct sas_phy_linkrates *rates)
351{
352 int ret;
353
354 if ((rates->minimum_linkrate &&
355 rates->minimum_linkrate > phy->maximum_linkrate) ||
356 (rates->maximum_linkrate &&
357 rates->maximum_linkrate < phy->minimum_linkrate))
358 return -EINVAL;
359
360 if (rates->minimum_linkrate &&
361 rates->minimum_linkrate < phy->minimum_linkrate_hw)
362 rates->minimum_linkrate = phy->minimum_linkrate_hw;
363
364 if (rates->maximum_linkrate &&
365 rates->maximum_linkrate > phy->maximum_linkrate_hw)
366 rates->maximum_linkrate = phy->maximum_linkrate_hw;
367
368 if (scsi_is_sas_phy_local(phy)) {
369 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
370 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
371 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
372 struct sas_internal *i =
373 to_sas_internal(sas_ha->core.shost->transportt);
374
375 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
376 rates);
377 } else {
378 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
379 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
380 ret = sas_smp_phy_control(ddev, phy->number,
381 PHY_FUNC_LINK_RESET, rates);
382
383 }
384
385 return ret;
386}
387
388void sas_prep_resume_ha(struct sas_ha_struct *ha)
389{
390 int i;
391
392 set_bit(SAS_HA_REGISTERED, &ha->state);
393
394 /* clear out any stale link events/data from the suspension path */
395 for (i = 0; i < ha->num_phys; i++) {
396 struct asd_sas_phy *phy = ha->sas_phy[i];
397
398 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
399 phy->port_events_pending = 0;
400 phy->phy_events_pending = 0;
401 phy->frame_rcvd_size = 0;
402 }
403}
404EXPORT_SYMBOL(sas_prep_resume_ha);
405
406static int phys_suspended(struct sas_ha_struct *ha)
407{
408 int i, rc = 0;
409
410 for (i = 0; i < ha->num_phys; i++) {
411 struct asd_sas_phy *phy = ha->sas_phy[i];
412
413 if (phy->suspended)
414 rc++;
415 }
416
417 return rc;
418}
419
420void sas_resume_ha(struct sas_ha_struct *ha)
421{
422 const unsigned long tmo = msecs_to_jiffies(25000);
423 int i;
424
425 /* deform ports on phys that did not resume
426 * at this point we may be racing the phy coming back (as posted
427 * by the lldd). So we post the event and once we are in the
428 * libsas context check that the phy remains suspended before
429 * tearing it down.
430 */
431 i = phys_suspended(ha);
432 if (i)
433 dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
434 i, i > 1 ? "s" : "");
435 wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
436 for (i = 0; i < ha->num_phys; i++) {
437 struct asd_sas_phy *phy = ha->sas_phy[i];
438
439 if (phy->suspended) {
440 dev_warn(&phy->phy->dev, "resume timeout\n");
441 sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
442 }
443 }
444
445 /* all phys are back up or timed out, turn on i/o so we can
446 * flush out disks that did not return
447 */
448 scsi_unblock_requests(ha->core.shost);
449 sas_drain_work(ha);
450}
451EXPORT_SYMBOL(sas_resume_ha);
452
453void sas_suspend_ha(struct sas_ha_struct *ha)
454{
455 int i;
456
457 sas_disable_events(ha);
458 scsi_block_requests(ha->core.shost);
459 for (i = 0; i < ha->num_phys; i++) {
460 struct asd_sas_port *port = ha->sas_port[i];
461
462 sas_discover_event(port, DISCE_SUSPEND);
463 }
464
465 /* flush suspend events while unregistered */
466 mutex_lock(&ha->drain_mutex);
467 __sas_drain_work(ha);
468 mutex_unlock(&ha->drain_mutex);
469}
470EXPORT_SYMBOL(sas_suspend_ha);
471
472static void sas_phy_release(struct sas_phy *phy)
473{
474 kfree(phy->hostdata);
475 phy->hostdata = NULL;
476}
477
478static void phy_reset_work(struct work_struct *work)
479{
480 struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
481
482 d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
483}
484
485static void phy_enable_work(struct work_struct *work)
486{
487 struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
488
489 d->enable_result = sas_phy_enable(d->phy, d->enable);
490}
491
492static int sas_phy_setup(struct sas_phy *phy)
493{
494 struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
495
496 if (!d)
497 return -ENOMEM;
498
499 mutex_init(&d->event_lock);
500 INIT_SAS_WORK(&d->reset_work, phy_reset_work);
501 INIT_SAS_WORK(&d->enable_work, phy_enable_work);
502 d->phy = phy;
503 phy->hostdata = d;
504
505 return 0;
506}
507
508static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
509{
510 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
511 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
512 struct sas_phy_data *d = phy->hostdata;
513 int rc;
514
515 if (!d)
516 return -ENOMEM;
517
518 /* libsas workqueue coordinates ata-eh reset with discovery */
519 mutex_lock(&d->event_lock);
520 d->reset_result = 0;
521 d->hard_reset = hard_reset;
522
523 spin_lock_irq(&ha->lock);
524 sas_queue_work(ha, &d->reset_work);
525 spin_unlock_irq(&ha->lock);
526
527 rc = sas_drain_work(ha);
528 if (rc == 0)
529 rc = d->reset_result;
530 mutex_unlock(&d->event_lock);
531
532 return rc;
533}
534
535static int queue_phy_enable(struct sas_phy *phy, int enable)
536{
537 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
538 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
539 struct sas_phy_data *d = phy->hostdata;
540 int rc;
541
542 if (!d)
543 return -ENOMEM;
544
545 /* libsas workqueue coordinates ata-eh reset with discovery */
546 mutex_lock(&d->event_lock);
547 d->enable_result = 0;
548 d->enable = enable;
549
550 spin_lock_irq(&ha->lock);
551 sas_queue_work(ha, &d->enable_work);
552 spin_unlock_irq(&ha->lock);
553
554 rc = sas_drain_work(ha);
555 if (rc == 0)
556 rc = d->enable_result;
557 mutex_unlock(&d->event_lock);
558
559 return rc;
560}
561
562static struct sas_function_template sft = {
563 .phy_enable = queue_phy_enable,
564 .phy_reset = queue_phy_reset,
565 .phy_setup = sas_phy_setup,
566 .phy_release = sas_phy_release,
567 .set_phy_speed = sas_set_phy_speed,
568 .get_linkerrors = sas_get_linkerrors,
569 .smp_handler = sas_smp_handler,
570};
571
572struct scsi_transport_template *
573sas_domain_attach_transport(struct sas_domain_function_template *dft)
574{
575 struct scsi_transport_template *stt = sas_attach_transport(&sft);
576 struct sas_internal *i;
577
578 if (!stt)
579 return stt;
580
581 i = to_sas_internal(stt);
582 i->dft = dft;
583 stt->create_work_queue = 1;
584 stt->eh_timed_out = sas_scsi_timed_out;
585 stt->eh_strategy_handler = sas_scsi_recover_host;
586
587 return stt;
588}
589EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
590
591
592void sas_domain_release_transport(struct scsi_transport_template *stt)
593{
594 sas_release_transport(stt);
595}
596EXPORT_SYMBOL_GPL(sas_domain_release_transport);
597
598/* ---------- SAS Class register/unregister ---------- */
599
600static int __init sas_class_init(void)
601{
602 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
603 if (!sas_task_cache)
604 return -ENOMEM;
605
606 return 0;
607}
608
609static void __exit sas_class_exit(void)
610{
611 kmem_cache_destroy(sas_task_cache);
612}
613
614MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
615MODULE_DESCRIPTION("SAS Transport Layer");
616MODULE_LICENSE("GPL v2");
617
618module_init(sas_class_init);
619module_exit(sas_class_exit);
620
621EXPORT_SYMBOL_GPL(sas_register_ha);
622EXPORT_SYMBOL_GPL(sas_unregister_ha);