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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 init_timer(&task->timer);
52 init_completion(&task->completion);
53 }
54
55 return task;
56}
57EXPORT_SYMBOL_GPL(sas_alloc_task);
58
59void sas_free_task(struct sas_task *task)
60{
61 if (task) {
62 BUG_ON(!list_empty(&task->list));
63 kmem_cache_free(sas_task_cache, task);
64 }
65}
66EXPORT_SYMBOL_GPL(sas_free_task);
67
68/*------------ SAS addr hash -----------*/
69void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
70{
71 const u32 poly = 0x00DB2777;
72 u32 r = 0;
73 int i;
74
75 for (i = 0; i < 8; i++) {
76 int b;
77 for (b = 7; b >= 0; b--) {
78 r <<= 1;
79 if ((1 << b) & sas_addr[i]) {
80 if (!(r & 0x01000000))
81 r ^= poly;
82 } else if (r & 0x01000000)
83 r ^= poly;
84 }
85 }
86
87 hashed[0] = (r >> 16) & 0xFF;
88 hashed[1] = (r >> 8) & 0xFF ;
89 hashed[2] = r & 0xFF;
90}
91
92
93/* ---------- HA events ---------- */
94
95void sas_hae_reset(struct work_struct *work)
96{
97 struct sas_ha_event *ev = to_sas_ha_event(work);
98 struct sas_ha_struct *ha = ev->ha;
99
100 clear_bit(HAE_RESET, &ha->pending);
101}
102
103int sas_register_ha(struct sas_ha_struct *sas_ha)
104{
105 int error = 0;
106
107 mutex_init(&sas_ha->disco_mutex);
108 spin_lock_init(&sas_ha->phy_port_lock);
109 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
110
111 if (sas_ha->lldd_queue_size == 0)
112 sas_ha->lldd_queue_size = 1;
113 else if (sas_ha->lldd_queue_size == -1)
114 sas_ha->lldd_queue_size = 128; /* Sanity */
115
116 set_bit(SAS_HA_REGISTERED, &sas_ha->state);
117 spin_lock_init(&sas_ha->state_lock);
118 mutex_init(&sas_ha->drain_mutex);
119 INIT_LIST_HEAD(&sas_ha->defer_q);
120
121 error = sas_register_phys(sas_ha);
122 if (error) {
123 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
124 return error;
125 }
126
127 error = sas_register_ports(sas_ha);
128 if (error) {
129 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
130 goto Undo_phys;
131 }
132
133 error = sas_init_events(sas_ha);
134 if (error) {
135 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
136 goto Undo_ports;
137 }
138
139 if (sas_ha->lldd_max_execute_num > 1) {
140 error = sas_init_queue(sas_ha);
141 if (error) {
142 printk(KERN_NOTICE "couldn't start queue thread:%d, "
143 "running in direct mode\n", error);
144 sas_ha->lldd_max_execute_num = 1;
145 }
146 }
147
148 INIT_LIST_HEAD(&sas_ha->eh_done_q);
149 INIT_LIST_HEAD(&sas_ha->eh_ata_q);
150
151 return 0;
152
153Undo_ports:
154 sas_unregister_ports(sas_ha);
155Undo_phys:
156
157 return error;
158}
159
160int sas_unregister_ha(struct sas_ha_struct *sas_ha)
161{
162 /* Set the state to unregistered to avoid further unchained
163 * events to be queued, and flush any in-progress drainers
164 */
165 mutex_lock(&sas_ha->drain_mutex);
166 spin_lock_irq(&sas_ha->state_lock);
167 clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
168 spin_unlock_irq(&sas_ha->state_lock);
169 __sas_drain_work(sas_ha);
170 mutex_unlock(&sas_ha->drain_mutex);
171
172 sas_unregister_ports(sas_ha);
173
174 /* flush unregistration work */
175 mutex_lock(&sas_ha->drain_mutex);
176 __sas_drain_work(sas_ha);
177 mutex_unlock(&sas_ha->drain_mutex);
178
179 if (sas_ha->lldd_max_execute_num > 1) {
180 sas_shutdown_queue(sas_ha);
181 sas_ha->lldd_max_execute_num = 1;
182 }
183
184 return 0;
185}
186
187static int sas_get_linkerrors(struct sas_phy *phy)
188{
189 if (scsi_is_sas_phy_local(phy)) {
190 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
191 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
192 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
193 struct sas_internal *i =
194 to_sas_internal(sas_ha->core.shost->transportt);
195
196 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
197 }
198
199 return sas_smp_get_phy_events(phy);
200}
201
202int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
203{
204 struct domain_device *dev = NULL;
205
206 /* try to route user requested link resets through libata */
207 if (asd_phy->port)
208 dev = asd_phy->port->port_dev;
209
210 /* validate that dev has been probed */
211 if (dev)
212 dev = sas_find_dev_by_rphy(dev->rphy);
213
214 if (dev && dev_is_sata(dev)) {
215 sas_ata_schedule_reset(dev);
216 sas_ata_wait_eh(dev);
217 return 0;
218 }
219
220 return -ENODEV;
221}
222
223/**
224 * transport_sas_phy_reset - reset a phy and permit libata to manage the link
225 *
226 * phy reset request via sysfs in host workqueue context so we know we
227 * can block on eh and safely traverse the domain_device topology
228 */
229static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
230{
231 enum phy_func reset_type;
232
233 if (hard_reset)
234 reset_type = PHY_FUNC_HARD_RESET;
235 else
236 reset_type = PHY_FUNC_LINK_RESET;
237
238 if (scsi_is_sas_phy_local(phy)) {
239 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
240 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
241 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
242 struct sas_internal *i =
243 to_sas_internal(sas_ha->core.shost->transportt);
244
245 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
246 return 0;
247 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
248 } else {
249 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
250 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
251 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
252
253 if (ata_dev && !hard_reset) {
254 sas_ata_schedule_reset(ata_dev);
255 sas_ata_wait_eh(ata_dev);
256 return 0;
257 } else
258 return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
259 }
260}
261
262static int sas_phy_enable(struct sas_phy *phy, int enable)
263{
264 int ret;
265 enum phy_func cmd;
266
267 if (enable)
268 cmd = PHY_FUNC_LINK_RESET;
269 else
270 cmd = PHY_FUNC_DISABLE;
271
272 if (scsi_is_sas_phy_local(phy)) {
273 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
274 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
275 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
276 struct sas_internal *i =
277 to_sas_internal(sas_ha->core.shost->transportt);
278
279 if (enable)
280 ret = transport_sas_phy_reset(phy, 0);
281 else
282 ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
283 } else {
284 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
285 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
286
287 if (enable)
288 ret = transport_sas_phy_reset(phy, 0);
289 else
290 ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
291 }
292 return ret;
293}
294
295int sas_phy_reset(struct sas_phy *phy, int hard_reset)
296{
297 int ret;
298 enum phy_func reset_type;
299
300 if (!phy->enabled)
301 return -ENODEV;
302
303 if (hard_reset)
304 reset_type = PHY_FUNC_HARD_RESET;
305 else
306 reset_type = PHY_FUNC_LINK_RESET;
307
308 if (scsi_is_sas_phy_local(phy)) {
309 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
310 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
311 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
312 struct sas_internal *i =
313 to_sas_internal(sas_ha->core.shost->transportt);
314
315 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
316 } else {
317 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
318 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
319 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
320 }
321 return ret;
322}
323
324int sas_set_phy_speed(struct sas_phy *phy,
325 struct sas_phy_linkrates *rates)
326{
327 int ret;
328
329 if ((rates->minimum_linkrate &&
330 rates->minimum_linkrate > phy->maximum_linkrate) ||
331 (rates->maximum_linkrate &&
332 rates->maximum_linkrate < phy->minimum_linkrate))
333 return -EINVAL;
334
335 if (rates->minimum_linkrate &&
336 rates->minimum_linkrate < phy->minimum_linkrate_hw)
337 rates->minimum_linkrate = phy->minimum_linkrate_hw;
338
339 if (rates->maximum_linkrate &&
340 rates->maximum_linkrate > phy->maximum_linkrate_hw)
341 rates->maximum_linkrate = phy->maximum_linkrate_hw;
342
343 if (scsi_is_sas_phy_local(phy)) {
344 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
345 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
346 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
347 struct sas_internal *i =
348 to_sas_internal(sas_ha->core.shost->transportt);
349
350 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
351 rates);
352 } else {
353 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
354 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
355 ret = sas_smp_phy_control(ddev, phy->number,
356 PHY_FUNC_LINK_RESET, rates);
357
358 }
359
360 return ret;
361}
362
363static void sas_phy_release(struct sas_phy *phy)
364{
365 kfree(phy->hostdata);
366 phy->hostdata = NULL;
367}
368
369static void phy_reset_work(struct work_struct *work)
370{
371 struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
372
373 d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
374}
375
376static void phy_enable_work(struct work_struct *work)
377{
378 struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
379
380 d->enable_result = sas_phy_enable(d->phy, d->enable);
381}
382
383static int sas_phy_setup(struct sas_phy *phy)
384{
385 struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
386
387 if (!d)
388 return -ENOMEM;
389
390 mutex_init(&d->event_lock);
391 INIT_SAS_WORK(&d->reset_work, phy_reset_work);
392 INIT_SAS_WORK(&d->enable_work, phy_enable_work);
393 d->phy = phy;
394 phy->hostdata = d;
395
396 return 0;
397}
398
399static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
400{
401 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
402 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
403 struct sas_phy_data *d = phy->hostdata;
404 int rc;
405
406 if (!d)
407 return -ENOMEM;
408
409 /* libsas workqueue coordinates ata-eh reset with discovery */
410 mutex_lock(&d->event_lock);
411 d->reset_result = 0;
412 d->hard_reset = hard_reset;
413
414 spin_lock_irq(&ha->state_lock);
415 sas_queue_work(ha, &d->reset_work);
416 spin_unlock_irq(&ha->state_lock);
417
418 rc = sas_drain_work(ha);
419 if (rc == 0)
420 rc = d->reset_result;
421 mutex_unlock(&d->event_lock);
422
423 return rc;
424}
425
426static int queue_phy_enable(struct sas_phy *phy, int enable)
427{
428 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
429 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
430 struct sas_phy_data *d = phy->hostdata;
431 int rc;
432
433 if (!d)
434 return -ENOMEM;
435
436 /* libsas workqueue coordinates ata-eh reset with discovery */
437 mutex_lock(&d->event_lock);
438 d->enable_result = 0;
439 d->enable = enable;
440
441 spin_lock_irq(&ha->state_lock);
442 sas_queue_work(ha, &d->enable_work);
443 spin_unlock_irq(&ha->state_lock);
444
445 rc = sas_drain_work(ha);
446 if (rc == 0)
447 rc = d->enable_result;
448 mutex_unlock(&d->event_lock);
449
450 return rc;
451}
452
453static struct sas_function_template sft = {
454 .phy_enable = queue_phy_enable,
455 .phy_reset = queue_phy_reset,
456 .phy_setup = sas_phy_setup,
457 .phy_release = sas_phy_release,
458 .set_phy_speed = sas_set_phy_speed,
459 .get_linkerrors = sas_get_linkerrors,
460 .smp_handler = sas_smp_handler,
461};
462
463struct scsi_transport_template *
464sas_domain_attach_transport(struct sas_domain_function_template *dft)
465{
466 struct scsi_transport_template *stt = sas_attach_transport(&sft);
467 struct sas_internal *i;
468
469 if (!stt)
470 return stt;
471
472 i = to_sas_internal(stt);
473 i->dft = dft;
474 stt->create_work_queue = 1;
475 stt->eh_timed_out = sas_scsi_timed_out;
476 stt->eh_strategy_handler = sas_scsi_recover_host;
477
478 return stt;
479}
480EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
481
482
483void sas_domain_release_transport(struct scsi_transport_template *stt)
484{
485 sas_release_transport(stt);
486}
487EXPORT_SYMBOL_GPL(sas_domain_release_transport);
488
489/* ---------- SAS Class register/unregister ---------- */
490
491static int __init sas_class_init(void)
492{
493 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
494 if (!sas_task_cache)
495 return -ENOMEM;
496
497 return 0;
498}
499
500static void __exit sas_class_exit(void)
501{
502 kmem_cache_destroy(sas_task_cache);
503}
504
505MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
506MODULE_DESCRIPTION("SAS Transport Layer");
507MODULE_LICENSE("GPL v2");
508
509module_init(sas_class_init);
510module_exit(sas_class_exit);
511
512EXPORT_SYMBOL_GPL(sas_register_ha);
513EXPORT_SYMBOL_GPL(sas_unregister_ha);