1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Serial Attached SCSI (SAS) Transport Layer initialization
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/device.h>
13 #include <linux/spinlock.h>
14 #include <scsi/sas_ata.h>
15 #include <scsi/scsi_host.h>
16 #include <scsi/scsi_device.h>
17 #include <scsi/scsi_transport.h>
18 #include <scsi/scsi_transport_sas.h>
19
20 #include "sas_internal.h"
21
22 #include "scsi_sas_internal.h"
23
24 static struct kmem_cache *sas_task_cache;
25 static struct kmem_cache *sas_event_cache;
26
sas_alloc_task(gfp_t flags)27 struct sas_task *sas_alloc_task(gfp_t flags)
28 {
29 struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
30
31 if (task) {
32 spin_lock_init(&task->task_state_lock);
33 task->task_state_flags = SAS_TASK_STATE_PENDING;
34 }
35
36 return task;
37 }
38
sas_alloc_slow_task(gfp_t flags)39 struct sas_task *sas_alloc_slow_task(gfp_t flags)
40 {
41 struct sas_task *task = sas_alloc_task(flags);
42 struct sas_task_slow *slow = kmalloc_obj(*slow, flags);
43
44 if (!task || !slow) {
45 if (task)
46 kmem_cache_free(sas_task_cache, task);
47 kfree(slow);
48 return NULL;
49 }
50
51 task->slow_task = slow;
52 slow->task = task;
53 timer_setup(&slow->timer, NULL, 0);
54 init_completion(&slow->completion);
55
56 return task;
57 }
58
sas_free_task(struct sas_task * task)59 void sas_free_task(struct sas_task *task)
60 {
61 if (task) {
62 kfree(task->slow_task);
63 kmem_cache_free(sas_task_cache, task);
64 }
65 }
66
67 /*------------ SAS addr hash -----------*/
sas_hash_addr(u8 * hashed,const u8 * sas_addr)68 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
69 {
70 const u32 poly = 0x00DB2777;
71 u32 r = 0;
72 int i;
73
74 for (i = 0; i < SAS_ADDR_SIZE; i++) {
75 int b;
76
77 for (b = (SAS_ADDR_SIZE - 1); 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
88 hashed[0] = (r >> 16) & 0xFF;
89 hashed[1] = (r >> 8) & 0xFF;
90 hashed[2] = r & 0xFF;
91 }
92
sas_register_ha(struct sas_ha_struct * sas_ha)93 int sas_register_ha(struct sas_ha_struct *sas_ha)
94 {
95 char name[64];
96 int error = 0;
97
98 mutex_init(&sas_ha->disco_mutex);
99 spin_lock_init(&sas_ha->phy_port_lock);
100 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
101
102 set_bit(SAS_HA_REGISTERED, &sas_ha->state);
103 spin_lock_init(&sas_ha->lock);
104 mutex_init(&sas_ha->drain_mutex);
105 init_waitqueue_head(&sas_ha->eh_wait_q);
106 INIT_LIST_HEAD(&sas_ha->defer_q);
107 INIT_LIST_HEAD(&sas_ha->eh_dev_q);
108
109 sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES;
110
111 error = sas_register_phys(sas_ha);
112 if (error) {
113 pr_notice("couldn't register sas phys:%d\n", error);
114 return error;
115 }
116
117 error = sas_register_ports(sas_ha);
118 if (error) {
119 pr_notice("couldn't register sas ports:%d\n", error);
120 goto Undo_phys;
121 }
122
123 error = -ENOMEM;
124 snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev));
125 sas_ha->event_q = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, name);
126 if (!sas_ha->event_q)
127 goto Undo_ports;
128
129 snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev));
130 sas_ha->disco_q = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, name);
131 if (!sas_ha->disco_q)
132 goto Undo_event_q;
133
134 INIT_LIST_HEAD(&sas_ha->eh_done_q);
135 INIT_LIST_HEAD(&sas_ha->eh_ata_q);
136
137 return 0;
138
139 Undo_event_q:
140 destroy_workqueue(sas_ha->event_q);
141 Undo_ports:
142 sas_unregister_ports(sas_ha);
143 Undo_phys:
144 sas_unregister_phys(sas_ha);
145
146 return error;
147 }
148 EXPORT_SYMBOL_GPL(sas_register_ha);
149
sas_disable_events(struct sas_ha_struct * sas_ha)150 static void sas_disable_events(struct sas_ha_struct *sas_ha)
151 {
152 /* Set the state to unregistered to avoid further unchained
153 * events to be queued, and flush any in-progress drainers
154 */
155 mutex_lock(&sas_ha->drain_mutex);
156 spin_lock_irq(&sas_ha->lock);
157 clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
158 spin_unlock_irq(&sas_ha->lock);
159 __sas_drain_work(sas_ha);
160 mutex_unlock(&sas_ha->drain_mutex);
161 }
162
sas_unregister_ha(struct sas_ha_struct * sas_ha)163 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
164 {
165 sas_disable_events(sas_ha);
166 sas_unregister_ports(sas_ha);
167
168 /* flush unregistration work */
169 mutex_lock(&sas_ha->drain_mutex);
170 __sas_drain_work(sas_ha);
171 mutex_unlock(&sas_ha->drain_mutex);
172
173 destroy_workqueue(sas_ha->disco_q);
174 destroy_workqueue(sas_ha->event_q);
175
176 return 0;
177 }
178 EXPORT_SYMBOL_GPL(sas_unregister_ha);
179
sas_get_linkerrors(struct sas_phy * phy)180 static int sas_get_linkerrors(struct sas_phy *phy)
181 {
182 if (scsi_is_sas_phy_local(phy)) {
183 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
184 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
185 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
186 struct sas_internal *i =
187 to_sas_internal(sas_ha->shost->transportt);
188
189 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
190 }
191
192 return sas_smp_get_phy_events(phy);
193 }
194
sas_try_ata_reset(struct asd_sas_phy * asd_phy)195 int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
196 {
197 struct domain_device *dev = NULL;
198
199 /* try to route user requested link resets through libata */
200 if (asd_phy->port)
201 dev = asd_phy->port->port_dev;
202
203 /* validate that dev has been probed */
204 if (dev)
205 dev = sas_find_dev_by_rphy(dev->rphy);
206
207 if (dev && dev_is_sata(dev)) {
208 sas_ata_schedule_reset(dev);
209 sas_ata_wait_eh(dev);
210 return 0;
211 }
212
213 return -ENODEV;
214 }
215
216 /*
217 * transport_sas_phy_reset - reset a phy and permit libata to manage the link
218 *
219 * phy reset request via sysfs in host workqueue context so we know we
220 * can block on eh and safely traverse the domain_device topology
221 */
transport_sas_phy_reset(struct sas_phy * phy,int hard_reset)222 static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
223 {
224 enum phy_func reset_type;
225
226 if (hard_reset)
227 reset_type = PHY_FUNC_HARD_RESET;
228 else
229 reset_type = PHY_FUNC_LINK_RESET;
230
231 if (scsi_is_sas_phy_local(phy)) {
232 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
233 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
234 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
235 struct sas_internal *i =
236 to_sas_internal(sas_ha->shost->transportt);
237
238 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
239 return 0;
240 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
241 } else {
242 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
243 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
244 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
245
246 if (ata_dev && !hard_reset) {
247 sas_ata_schedule_reset(ata_dev);
248 sas_ata_wait_eh(ata_dev);
249 return 0;
250 } else
251 return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
252 }
253 }
254
sas_phy_enable(struct sas_phy * phy,int enable)255 int sas_phy_enable(struct sas_phy *phy, int enable)
256 {
257 int ret;
258 enum phy_func cmd;
259
260 if (enable)
261 cmd = PHY_FUNC_LINK_RESET;
262 else
263 cmd = PHY_FUNC_DISABLE;
264
265 if (scsi_is_sas_phy_local(phy)) {
266 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
267 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
268 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
269 struct sas_internal *i =
270 to_sas_internal(sas_ha->shost->transportt);
271
272 if (enable)
273 ret = transport_sas_phy_reset(phy, 0);
274 else
275 ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
276 } else {
277 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
278 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
279
280 if (enable)
281 ret = transport_sas_phy_reset(phy, 0);
282 else
283 ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
284 }
285 return ret;
286 }
287 EXPORT_SYMBOL_GPL(sas_phy_enable);
288
sas_phy_reset(struct sas_phy * phy,int hard_reset)289 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
290 {
291 int ret;
292 enum phy_func reset_type;
293
294 if (!phy->enabled)
295 return -ENODEV;
296
297 if (hard_reset)
298 reset_type = PHY_FUNC_HARD_RESET;
299 else
300 reset_type = PHY_FUNC_LINK_RESET;
301
302 if (scsi_is_sas_phy_local(phy)) {
303 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
304 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
305 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
306 struct sas_internal *i =
307 to_sas_internal(sas_ha->shost->transportt);
308
309 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
310 } else {
311 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
312 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
313 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
314 }
315 return ret;
316 }
317 EXPORT_SYMBOL_GPL(sas_phy_reset);
318
sas_set_phy_speed(struct sas_phy * phy,struct sas_phy_linkrates * rates)319 static int sas_set_phy_speed(struct sas_phy *phy,
320 struct sas_phy_linkrates *rates)
321 {
322 int ret;
323
324 if ((rates->minimum_linkrate &&
325 rates->minimum_linkrate > phy->maximum_linkrate) ||
326 (rates->maximum_linkrate &&
327 rates->maximum_linkrate < phy->minimum_linkrate))
328 return -EINVAL;
329
330 if (rates->minimum_linkrate &&
331 rates->minimum_linkrate < phy->minimum_linkrate_hw)
332 rates->minimum_linkrate = phy->minimum_linkrate_hw;
333
334 if (rates->maximum_linkrate &&
335 rates->maximum_linkrate > phy->maximum_linkrate_hw)
336 rates->maximum_linkrate = phy->maximum_linkrate_hw;
337
338 if (scsi_is_sas_phy_local(phy)) {
339 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
340 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
341 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
342 struct sas_internal *i =
343 to_sas_internal(sas_ha->shost->transportt);
344
345 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
346 rates);
347 } else {
348 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
349 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
350 ret = sas_smp_phy_control(ddev, phy->number,
351 PHY_FUNC_LINK_RESET, rates);
352
353 }
354
355 return ret;
356 }
357
sas_prep_resume_ha(struct sas_ha_struct * ha)358 void sas_prep_resume_ha(struct sas_ha_struct *ha)
359 {
360 int i;
361
362 set_bit(SAS_HA_REGISTERED, &ha->state);
363 set_bit(SAS_HA_RESUMING, &ha->state);
364
365 /* clear out any stale link events/data from the suspension path */
366 for (i = 0; i < ha->num_phys; i++) {
367 struct asd_sas_phy *phy = ha->sas_phy[i];
368
369 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
370 phy->frame_rcvd_size = 0;
371 }
372 }
373 EXPORT_SYMBOL(sas_prep_resume_ha);
374
phys_suspended(struct sas_ha_struct * ha)375 static int phys_suspended(struct sas_ha_struct *ha)
376 {
377 int i, rc = 0;
378
379 for (i = 0; i < ha->num_phys; i++) {
380 struct asd_sas_phy *phy = ha->sas_phy[i];
381
382 if (phy->suspended)
383 rc++;
384 }
385
386 return rc;
387 }
388
sas_resume_insert_broadcast_ha(struct sas_ha_struct * ha)389 static void sas_resume_insert_broadcast_ha(struct sas_ha_struct *ha)
390 {
391 int i;
392
393 for (i = 0; i < ha->num_phys; i++) {
394 struct asd_sas_port *port = ha->sas_port[i];
395 struct domain_device *dev = port->port_dev;
396
397 if (dev && dev_is_expander(dev->dev_type)) {
398 struct asd_sas_phy *first_phy;
399
400 spin_lock(&port->phy_list_lock);
401 first_phy = list_first_entry_or_null(
402 &port->phy_list, struct asd_sas_phy,
403 port_phy_el);
404 spin_unlock(&port->phy_list_lock);
405
406 if (first_phy)
407 sas_notify_port_event(first_phy,
408 PORTE_BROADCAST_RCVD, GFP_KERNEL);
409 }
410 }
411 }
412
sas_resume_ha(struct sas_ha_struct * ha)413 void sas_resume_ha(struct sas_ha_struct *ha)
414 {
415 const unsigned long tmo = msecs_to_jiffies(25000);
416 int i;
417
418 /* deform ports on phys that did not resume
419 * at this point we may be racing the phy coming back (as posted
420 * by the lldd). So we post the event and once we are in the
421 * libsas context check that the phy remains suspended before
422 * tearing it down.
423 */
424 i = phys_suspended(ha);
425 if (i)
426 dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
427 i, i > 1 ? "s" : "");
428 wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
429
430 /*
431 * All phys are back up or timed out. Turn on I/O and drain
432 * pending work.
433 */
434 scsi_unblock_requests(ha->shost);
435 sas_drain_work(ha);
436
437 /*
438 * Send PHYE_RESUME_TIMEOUT after sas_drain_work(). The handler
439 * calls sas_deform_port() -> sas_destruct_devices(), which removes
440 * SCSI devices and, for LLDDs using device_link() PM sync, waits
441 * for the host to be runtime-active. Sending it before the drain
442 * would deadlock: the drain waits for the handler, the handler
443 * waits for host resume, and host resume waits for the drain to
444 * finish.
445 */
446 for (i = 0; i < ha->num_phys; i++) {
447 struct asd_sas_phy *phy = ha->sas_phy[i];
448
449 if (phy->suspended) {
450 dev_warn(&phy->phy->dev, "resume timeout\n");
451 sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT,
452 GFP_KERNEL);
453 }
454 }
455
456 clear_bit(SAS_HA_RESUMING, &ha->state);
457
458 sas_queue_deferred_work(ha);
459 /* send event PORTE_BROADCAST_RCVD to identify some new inserted
460 * disks for expander
461 */
462 sas_resume_insert_broadcast_ha(ha);
463 }
464 EXPORT_SYMBOL(sas_resume_ha);
465
sas_suspend_ha(struct sas_ha_struct * ha)466 void sas_suspend_ha(struct sas_ha_struct *ha)
467 {
468 int i;
469
470 sas_disable_events(ha);
471 scsi_block_requests(ha->shost);
472 for (i = 0; i < ha->num_phys; i++) {
473 struct asd_sas_port *port = ha->sas_port[i];
474
475 sas_discover_event(port, DISCE_SUSPEND);
476 }
477
478 /* flush suspend events while unregistered */
479 mutex_lock(&ha->drain_mutex);
480 __sas_drain_work(ha);
481 mutex_unlock(&ha->drain_mutex);
482 }
483 EXPORT_SYMBOL(sas_suspend_ha);
484
sas_phy_release(struct sas_phy * phy)485 static void sas_phy_release(struct sas_phy *phy)
486 {
487 kfree(phy->hostdata);
488 phy->hostdata = NULL;
489 }
490
phy_reset_work(struct work_struct * work)491 static void phy_reset_work(struct work_struct *work)
492 {
493 struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
494
495 d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
496 }
497
phy_enable_work(struct work_struct * work)498 static void phy_enable_work(struct work_struct *work)
499 {
500 struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
501
502 d->enable_result = sas_phy_enable(d->phy, d->enable);
503 }
504
sas_phy_setup(struct sas_phy * phy)505 static int sas_phy_setup(struct sas_phy *phy)
506 {
507 struct sas_phy_data *d = kzalloc_obj(*d);
508
509 if (!d)
510 return -ENOMEM;
511
512 mutex_init(&d->event_lock);
513 INIT_SAS_WORK(&d->reset_work, phy_reset_work);
514 INIT_SAS_WORK(&d->enable_work, phy_enable_work);
515 d->phy = phy;
516 phy->hostdata = d;
517
518 return 0;
519 }
520
queue_phy_reset(struct sas_phy * phy,int hard_reset)521 static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
522 {
523 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
524 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
525 struct sas_phy_data *d = phy->hostdata;
526 int rc;
527
528 if (!d)
529 return -ENOMEM;
530
531 pm_runtime_get_sync(ha->dev);
532 /* libsas workqueue coordinates ata-eh reset with discovery */
533 mutex_lock(&d->event_lock);
534 d->reset_result = 0;
535 d->hard_reset = hard_reset;
536
537 spin_lock_irq(&ha->lock);
538 sas_queue_work(ha, &d->reset_work);
539 spin_unlock_irq(&ha->lock);
540
541 rc = sas_drain_work(ha);
542 if (rc == 0)
543 rc = d->reset_result;
544 mutex_unlock(&d->event_lock);
545 pm_runtime_put_sync(ha->dev);
546
547 return rc;
548 }
549
queue_phy_enable(struct sas_phy * phy,int enable)550 static int queue_phy_enable(struct sas_phy *phy, int enable)
551 {
552 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
553 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
554 struct sas_phy_data *d = phy->hostdata;
555 int rc;
556
557 if (!d)
558 return -ENOMEM;
559
560 pm_runtime_get_sync(ha->dev);
561 /* libsas workqueue coordinates ata-eh reset with discovery */
562 mutex_lock(&d->event_lock);
563 d->enable_result = 0;
564 d->enable = enable;
565
566 spin_lock_irq(&ha->lock);
567 sas_queue_work(ha, &d->enable_work);
568 spin_unlock_irq(&ha->lock);
569
570 rc = sas_drain_work(ha);
571 if (rc == 0)
572 rc = d->enable_result;
573 mutex_unlock(&d->event_lock);
574 pm_runtime_put_sync(ha->dev);
575
576 return rc;
577 }
578
579 static struct sas_function_template sft = {
580 .phy_enable = queue_phy_enable,
581 .phy_reset = queue_phy_reset,
582 .phy_setup = sas_phy_setup,
583 .phy_release = sas_phy_release,
584 .set_phy_speed = sas_set_phy_speed,
585 .get_linkerrors = sas_get_linkerrors,
586 .smp_handler = sas_smp_handler,
587 };
588
phy_event_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)589 static inline ssize_t phy_event_threshold_show(struct device *dev,
590 struct device_attribute *attr, char *buf)
591 {
592 struct Scsi_Host *shost = class_to_shost(dev);
593 struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
594
595 return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres);
596 }
597
phy_event_threshold_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)598 static inline ssize_t phy_event_threshold_store(struct device *dev,
599 struct device_attribute *attr,
600 const char *buf, size_t count)
601 {
602 struct Scsi_Host *shost = class_to_shost(dev);
603 struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
604
605 sha->event_thres = simple_strtol(buf, NULL, 10);
606
607 /* threshold cannot be set too small */
608 if (sha->event_thres < 32)
609 sha->event_thres = 32;
610
611 return count;
612 }
613
614 DEVICE_ATTR(phy_event_threshold,
615 S_IRUGO|S_IWUSR,
616 phy_event_threshold_show,
617 phy_event_threshold_store);
618 EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold);
619
620 struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template * dft)621 sas_domain_attach_transport(struct sas_domain_function_template *dft)
622 {
623 struct scsi_transport_template *stt = sas_attach_transport(&sft);
624 struct sas_internal *i;
625
626 if (!stt)
627 return stt;
628
629 i = to_sas_internal(stt);
630 i->dft = dft;
631 stt->create_work_queue = 1;
632 stt->eh_strategy_handler = sas_scsi_recover_host;
633
634 return stt;
635 }
636 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
637
sas_alloc_event(struct asd_sas_phy * phy,gfp_t gfp_flags)638 struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy,
639 gfp_t gfp_flags)
640 {
641 struct asd_sas_event *event;
642 struct sas_ha_struct *sas_ha = phy->ha;
643 struct sas_internal *i =
644 to_sas_internal(sas_ha->shost->transportt);
645
646 event = kmem_cache_zalloc(sas_event_cache, gfp_flags);
647 if (!event)
648 return NULL;
649
650 atomic_inc(&phy->event_nr);
651
652 if (atomic_read(&phy->event_nr) > phy->ha->event_thres) {
653 if (i->dft->lldd_control_phy) {
654 if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) {
655 pr_notice("The phy%d bursting events, shut it down.\n",
656 phy->id);
657 sas_notify_phy_event(phy, PHYE_SHUTDOWN,
658 gfp_flags);
659 }
660 } else {
661 /* Do not support PHY control, stop allocating events */
662 WARN_ONCE(1, "PHY control not supported.\n");
663 kmem_cache_free(sas_event_cache, event);
664 atomic_dec(&phy->event_nr);
665 event = NULL;
666 }
667 }
668
669 return event;
670 }
671
sas_free_event(struct asd_sas_event * event)672 void sas_free_event(struct asd_sas_event *event)
673 {
674 struct asd_sas_phy *phy = event->phy;
675
676 kmem_cache_free(sas_event_cache, event);
677 atomic_dec(&phy->event_nr);
678 }
679
680 /* ---------- SAS Class register/unregister ---------- */
681
sas_class_init(void)682 static int __init sas_class_init(void)
683 {
684 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
685 if (!sas_task_cache)
686 goto out;
687
688 sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN);
689 if (!sas_event_cache)
690 goto free_task_kmem;
691
692 return 0;
693 free_task_kmem:
694 kmem_cache_destroy(sas_task_cache);
695 out:
696 return -ENOMEM;
697 }
698
sas_class_exit(void)699 static void __exit sas_class_exit(void)
700 {
701 kmem_cache_destroy(sas_task_cache);
702 kmem_cache_destroy(sas_event_cache);
703 }
704
705 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
706 MODULE_DESCRIPTION("SAS Transport Layer");
707 MODULE_LICENSE("GPL v2");
708
709 module_init(sas_class_init);
710 module_exit(sas_class_exit);
711
712