sas_init.c

  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
 24static struct kmem_cache *sas_task_cache;
 25static struct kmem_cache *sas_event_cache;
 26
 27struct 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
 39struct 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(sizeof(*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
 59void 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 -----------*/
 68void 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
 93int 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
139Undo_event_q:
140	destroy_workqueue(sas_ha->event_q);
141Undo_ports:
142	sas_unregister_ports(sas_ha);
143Undo_phys:
144	sas_unregister_phys(sas_ha);
145
146	return error;
147}
148EXPORT_SYMBOL_GPL(sas_register_ha);
149
150static 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
163int 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}
178EXPORT_SYMBOL_GPL(sas_unregister_ha);
179
180static 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
195int 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 */
222static 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
255int 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}
287EXPORT_SYMBOL_GPL(sas_phy_enable);
288
289int 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}
317EXPORT_SYMBOL_GPL(sas_phy_reset);
318
319static 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
358void 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}
373EXPORT_SYMBOL(sas_prep_resume_ha);
374
375static 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
389static 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
413static void _sas_resume_ha(struct sas_ha_struct *ha, bool drain)
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	for (i = 0; i < ha->num_phys; i++) {
430		struct asd_sas_phy *phy = ha->sas_phy[i];
431
432		if (phy->suspended) {
433			dev_warn(&phy->phy->dev, "resume timeout\n");
434			sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT,
435					     GFP_KERNEL);
436		}
437	}
438
439	/* all phys are back up or timed out, turn on i/o so we can
440	 * flush out disks that did not return
441	 */
442	scsi_unblock_requests(ha->shost);
443	if (drain)
444		sas_drain_work(ha);
445	clear_bit(SAS_HA_RESUMING, &ha->state);
446
447	sas_queue_deferred_work(ha);
448	/* send event PORTE_BROADCAST_RCVD to identify some new inserted
449	 * disks for expander
450	 */
451	sas_resume_insert_broadcast_ha(ha);
452}
453
454void sas_resume_ha(struct sas_ha_struct *ha)
455{
456	_sas_resume_ha(ha, true);
457}
458EXPORT_SYMBOL(sas_resume_ha);
459
460/* A no-sync variant, which does not call sas_drain_ha(). */
461void sas_resume_ha_no_sync(struct sas_ha_struct *ha)
462{
463	_sas_resume_ha(ha, false);
464}
465EXPORT_SYMBOL(sas_resume_ha_no_sync);
466
467void sas_suspend_ha(struct sas_ha_struct *ha)
468{
469	int i;
470
471	sas_disable_events(ha);
472	scsi_block_requests(ha->shost);
473	for (i = 0; i < ha->num_phys; i++) {
474		struct asd_sas_port *port = ha->sas_port[i];
475
476		sas_discover_event(port, DISCE_SUSPEND);
477	}
478
479	/* flush suspend events while unregistered */
480	mutex_lock(&ha->drain_mutex);
481	__sas_drain_work(ha);
482	mutex_unlock(&ha->drain_mutex);
483}
484EXPORT_SYMBOL(sas_suspend_ha);
485
486static void sas_phy_release(struct sas_phy *phy)
487{
488	kfree(phy->hostdata);
489	phy->hostdata = NULL;
490}
491
492static void phy_reset_work(struct work_struct *work)
493{
494	struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
495
496	d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
497}
498
499static void phy_enable_work(struct work_struct *work)
500{
501	struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
502
503	d->enable_result = sas_phy_enable(d->phy, d->enable);
504}
505
506static int sas_phy_setup(struct sas_phy *phy)
507{
508	struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
509
510	if (!d)
511		return -ENOMEM;
512
513	mutex_init(&d->event_lock);
514	INIT_SAS_WORK(&d->reset_work, phy_reset_work);
515	INIT_SAS_WORK(&d->enable_work, phy_enable_work);
516	d->phy = phy;
517	phy->hostdata = d;
518
519	return 0;
520}
521
522static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
523{
524	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
525	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
526	struct sas_phy_data *d = phy->hostdata;
527	int rc;
528
529	if (!d)
530		return -ENOMEM;
531
532	pm_runtime_get_sync(ha->dev);
533	/* libsas workqueue coordinates ata-eh reset with discovery */
534	mutex_lock(&d->event_lock);
535	d->reset_result = 0;
536	d->hard_reset = hard_reset;
537
538	spin_lock_irq(&ha->lock);
539	sas_queue_work(ha, &d->reset_work);
540	spin_unlock_irq(&ha->lock);
541
542	rc = sas_drain_work(ha);
543	if (rc == 0)
544		rc = d->reset_result;
545	mutex_unlock(&d->event_lock);
546	pm_runtime_put_sync(ha->dev);
547
548	return rc;
549}
550
551static int queue_phy_enable(struct sas_phy *phy, int enable)
552{
553	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
554	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
555	struct sas_phy_data *d = phy->hostdata;
556	int rc;
557
558	if (!d)
559		return -ENOMEM;
560
561	pm_runtime_get_sync(ha->dev);
562	/* libsas workqueue coordinates ata-eh reset with discovery */
563	mutex_lock(&d->event_lock);
564	d->enable_result = 0;
565	d->enable = enable;
566
567	spin_lock_irq(&ha->lock);
568	sas_queue_work(ha, &d->enable_work);
569	spin_unlock_irq(&ha->lock);
570
571	rc = sas_drain_work(ha);
572	if (rc == 0)
573		rc = d->enable_result;
574	mutex_unlock(&d->event_lock);
575	pm_runtime_put_sync(ha->dev);
576
577	return rc;
578}
579
580static struct sas_function_template sft = {
581	.phy_enable = queue_phy_enable,
582	.phy_reset = queue_phy_reset,
583	.phy_setup = sas_phy_setup,
584	.phy_release = sas_phy_release,
585	.set_phy_speed = sas_set_phy_speed,
586	.get_linkerrors = sas_get_linkerrors,
587	.smp_handler = sas_smp_handler,
588};
589
590static inline ssize_t phy_event_threshold_show(struct device *dev,
591			struct device_attribute *attr, char *buf)
592{
593	struct Scsi_Host *shost = class_to_shost(dev);
594	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
595
596	return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres);
597}
598
599static inline ssize_t phy_event_threshold_store(struct device *dev,
600			struct device_attribute *attr,
601			const char *buf, size_t count)
602{
603	struct Scsi_Host *shost = class_to_shost(dev);
604	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
605
606	sha->event_thres = simple_strtol(buf, NULL, 10);
607
608	/* threshold cannot be set too small */
609	if (sha->event_thres < 32)
610		sha->event_thres = 32;
611
612	return count;
613}
614
615DEVICE_ATTR(phy_event_threshold,
616	S_IRUGO|S_IWUSR,
617	phy_event_threshold_show,
618	phy_event_threshold_store);
619EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold);
620
621struct scsi_transport_template *
622sas_domain_attach_transport(struct sas_domain_function_template *dft)
623{
624	struct scsi_transport_template *stt = sas_attach_transport(&sft);
625	struct sas_internal *i;
626
627	if (!stt)
628		return stt;
629
630	i = to_sas_internal(stt);
631	i->dft = dft;
632	stt->create_work_queue = 1;
633	stt->eh_strategy_handler = sas_scsi_recover_host;
634
635	return stt;
636}
637EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
638
639struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy,
640				      gfp_t gfp_flags)
641{
642	struct asd_sas_event *event;
643	struct sas_ha_struct *sas_ha = phy->ha;
644	struct sas_internal *i =
645		to_sas_internal(sas_ha->shost->transportt);
646
647	event = kmem_cache_zalloc(sas_event_cache, gfp_flags);
648	if (!event)
649		return NULL;
650
651	atomic_inc(&phy->event_nr);
652
653	if (atomic_read(&phy->event_nr) > phy->ha->event_thres) {
654		if (i->dft->lldd_control_phy) {
655			if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) {
656				pr_notice("The phy%d bursting events, shut it down.\n",
657					  phy->id);
658				sas_notify_phy_event(phy, PHYE_SHUTDOWN,
659						     gfp_flags);
660			}
661		} else {
662			/* Do not support PHY control, stop allocating events */
663			WARN_ONCE(1, "PHY control not supported.\n");
664			kmem_cache_free(sas_event_cache, event);
665			atomic_dec(&phy->event_nr);
666			event = NULL;
667		}
668	}
669
670	return event;
671}
672
673void sas_free_event(struct asd_sas_event *event)
674{
675	struct asd_sas_phy *phy = event->phy;
676
677	kmem_cache_free(sas_event_cache, event);
678	atomic_dec(&phy->event_nr);
679}
680
681/* ---------- SAS Class register/unregister ---------- */
682
683static int __init sas_class_init(void)
684{
685	sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
686	if (!sas_task_cache)
687		goto out;
688
689	sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN);
690	if (!sas_event_cache)
691		goto free_task_kmem;
692
693	return 0;
694free_task_kmem:
695	kmem_cache_destroy(sas_task_cache);
696out:
697	return -ENOMEM;
698}
699
700static void __exit sas_class_exit(void)
701{
702	kmem_cache_destroy(sas_task_cache);
703	kmem_cache_destroy(sas_event_cache);
704}
705
706MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
707MODULE_DESCRIPTION("SAS Transport Layer");
708MODULE_LICENSE("GPL v2");
709
710module_init(sas_class_init);
711module_exit(sas_class_exit);
712