2 * Serial Attached SCSI (SAS) Transport Layer initialization
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 * This file is licensed under GPLv2.
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.
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.
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
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/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_sas.h>
36 #include "sas_internal.h"
38 #include "../scsi_sas_internal.h"
40 static struct kmem_cache *sas_task_cache;
42 struct sas_task *sas_alloc_task(gfp_t flags)
44 struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
47 INIT_LIST_HEAD(&task->list);
48 spin_lock_init(&task->task_state_lock);
49 task->task_state_flags = SAS_TASK_STATE_PENDING;
50 init_timer(&task->timer);
51 init_completion(&task->completion);
56 EXPORT_SYMBOL_GPL(sas_alloc_task);
58 void sas_free_task(struct sas_task *task)
61 BUG_ON(!list_empty(&task->list));
62 kmem_cache_free(sas_task_cache, task);
65 EXPORT_SYMBOL_GPL(sas_free_task);
67 /*------------ SAS addr hash -----------*/
68 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
70 const u32 poly = 0x00DB2777;
74 for (i = 0; i < 8; i++) {
76 for (b = 7; b >= 0; b--) {
78 if ((1 << b) & sas_addr[i]) {
79 if (!(r & 0x01000000))
81 } else if (r & 0x01000000)
86 hashed[0] = (r >> 16) & 0xFF;
87 hashed[1] = (r >> 8) & 0xFF ;
92 /* ---------- HA events ---------- */
94 void sas_hae_reset(struct work_struct *work)
96 struct sas_ha_event *ev =
97 container_of(work, struct sas_ha_event, work);
98 struct sas_ha_struct *ha = ev->ha;
100 clear_bit(HAE_RESET, &ha->pending);
103 int sas_register_ha(struct sas_ha_struct *sas_ha)
107 spin_lock_init(&sas_ha->phy_port_lock);
108 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
110 if (sas_ha->lldd_queue_size == 0)
111 sas_ha->lldd_queue_size = 1;
112 else if (sas_ha->lldd_queue_size == -1)
113 sas_ha->lldd_queue_size = 128; /* Sanity */
115 set_bit(SAS_HA_REGISTERED, &sas_ha->state);
116 spin_lock_init(&sas_ha->state_lock);
118 error = sas_register_phys(sas_ha);
120 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
124 error = sas_register_ports(sas_ha);
126 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
130 error = sas_init_events(sas_ha);
132 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
136 if (sas_ha->lldd_max_execute_num > 1) {
137 error = sas_init_queue(sas_ha);
139 printk(KERN_NOTICE "couldn't start queue thread:%d, "
140 "running in direct mode\n", error);
141 sas_ha->lldd_max_execute_num = 1;
145 INIT_LIST_HEAD(&sas_ha->eh_done_q);
150 sas_unregister_ports(sas_ha);
156 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
160 /* Set the state to unregistered to avoid further
161 * events to be queued */
162 spin_lock_irqsave(&sas_ha->state_lock, flags);
163 clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
164 spin_unlock_irqrestore(&sas_ha->state_lock, flags);
165 scsi_flush_work(sas_ha->core.shost);
167 sas_unregister_ports(sas_ha);
169 if (sas_ha->lldd_max_execute_num > 1) {
170 sas_shutdown_queue(sas_ha);
171 sas_ha->lldd_max_execute_num = 1;
177 static int sas_get_linkerrors(struct sas_phy *phy)
179 if (scsi_is_sas_phy_local(phy)) {
180 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
181 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
182 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
183 struct sas_internal *i =
184 to_sas_internal(sas_ha->core.shost->transportt);
186 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
189 return sas_smp_get_phy_events(phy);
192 int sas_phy_enable(struct sas_phy *phy, int enable)
195 enum phy_func command;
198 command = PHY_FUNC_LINK_RESET;
200 command = PHY_FUNC_DISABLE;
202 if (scsi_is_sas_phy_local(phy)) {
203 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
204 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
205 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
206 struct sas_internal *i =
207 to_sas_internal(sas_ha->core.shost->transportt);
210 sas_phy_disconnected(asd_phy);
211 sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
213 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
215 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
216 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
217 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
222 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
225 enum phy_func reset_type;
228 reset_type = PHY_FUNC_HARD_RESET;
230 reset_type = PHY_FUNC_LINK_RESET;
232 if (scsi_is_sas_phy_local(phy)) {
233 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
234 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
235 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
236 struct sas_internal *i =
237 to_sas_internal(sas_ha->core.shost->transportt);
239 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
241 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
242 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
243 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
248 int sas_set_phy_speed(struct sas_phy *phy,
249 struct sas_phy_linkrates *rates)
253 if ((rates->minimum_linkrate &&
254 rates->minimum_linkrate > phy->maximum_linkrate) ||
255 (rates->maximum_linkrate &&
256 rates->maximum_linkrate < phy->minimum_linkrate))
259 if (rates->minimum_linkrate &&
260 rates->minimum_linkrate < phy->minimum_linkrate_hw)
261 rates->minimum_linkrate = phy->minimum_linkrate_hw;
263 if (rates->maximum_linkrate &&
264 rates->maximum_linkrate > phy->maximum_linkrate_hw)
265 rates->maximum_linkrate = phy->maximum_linkrate_hw;
267 if (scsi_is_sas_phy_local(phy)) {
268 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
269 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
270 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
271 struct sas_internal *i =
272 to_sas_internal(sas_ha->core.shost->transportt);
274 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
277 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
278 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
279 ret = sas_smp_phy_control(ddev, phy->number,
280 PHY_FUNC_LINK_RESET, rates);
287 static struct sas_function_template sft = {
288 .phy_enable = sas_phy_enable,
289 .phy_reset = sas_phy_reset,
290 .set_phy_speed = sas_set_phy_speed,
291 .get_linkerrors = sas_get_linkerrors,
292 .smp_handler = sas_smp_handler,
295 struct scsi_transport_template *
296 sas_domain_attach_transport(struct sas_domain_function_template *dft)
298 struct scsi_transport_template *stt = sas_attach_transport(&sft);
299 struct sas_internal *i;
304 i = to_sas_internal(stt);
306 stt->create_work_queue = 1;
307 stt->eh_timed_out = sas_scsi_timed_out;
308 stt->eh_strategy_handler = sas_scsi_recover_host;
312 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
315 void sas_domain_release_transport(struct scsi_transport_template *stt)
317 sas_release_transport(stt);
319 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
321 /* ---------- SAS Class register/unregister ---------- */
323 static int __init sas_class_init(void)
325 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
332 static void __exit sas_class_exit(void)
334 kmem_cache_destroy(sas_task_cache);
337 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
338 MODULE_DESCRIPTION("SAS Transport Layer");
339 MODULE_LICENSE("GPL v2");
341 module_init(sas_class_init);
342 module_exit(sas_class_exit);
344 EXPORT_SYMBOL_GPL(sas_register_ha);
345 EXPORT_SYMBOL_GPL(sas_unregister_ha);