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 sas_begin_event(HAE_RESET, &ha->event_lock,
104 int sas_register_ha(struct sas_ha_struct *sas_ha)
108 spin_lock_init(&sas_ha->phy_port_lock);
109 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
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 */
116 sas_ha->state = SAS_HA_REGISTERED;
117 spin_lock_init(&sas_ha->state_lock);
119 error = sas_register_phys(sas_ha);
121 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
125 error = sas_register_ports(sas_ha);
127 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
131 error = sas_init_events(sas_ha);
133 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
137 if (sas_ha->lldd_max_execute_num > 1) {
138 error = sas_init_queue(sas_ha);
140 printk(KERN_NOTICE "couldn't start queue thread:%d, "
141 "running in direct mode\n", error);
142 sas_ha->lldd_max_execute_num = 1;
146 INIT_LIST_HEAD(&sas_ha->eh_done_q);
151 sas_unregister_ports(sas_ha);
157 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
161 /* Set the state to unregistered to avoid further
162 * events to be queued */
163 spin_lock_irqsave(&sas_ha->state_lock, flags);
164 sas_ha->state = SAS_HA_UNREGISTERED;
165 spin_unlock_irqrestore(&sas_ha->state_lock, flags);
166 scsi_flush_work(sas_ha->core.shost);
168 sas_unregister_ports(sas_ha);
170 if (sas_ha->lldd_max_execute_num > 1) {
171 sas_shutdown_queue(sas_ha);
172 sas_ha->lldd_max_execute_num = 1;
178 static int sas_get_linkerrors(struct sas_phy *phy)
180 if (scsi_is_sas_phy_local(phy)) {
181 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
182 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
183 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
184 struct sas_internal *i =
185 to_sas_internal(sas_ha->core.shost->transportt);
187 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
190 return sas_smp_get_phy_events(phy);
193 int sas_phy_enable(struct sas_phy *phy, int enable)
196 enum phy_func command;
199 command = PHY_FUNC_LINK_RESET;
201 command = PHY_FUNC_DISABLE;
203 if (scsi_is_sas_phy_local(phy)) {
204 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
205 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
206 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
207 struct sas_internal *i =
208 to_sas_internal(sas_ha->core.shost->transportt);
211 sas_phy_disconnected(asd_phy);
212 sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
214 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
216 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
217 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
218 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
223 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
226 enum phy_func reset_type;
229 reset_type = PHY_FUNC_HARD_RESET;
231 reset_type = PHY_FUNC_LINK_RESET;
233 if (scsi_is_sas_phy_local(phy)) {
234 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
235 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
236 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
237 struct sas_internal *i =
238 to_sas_internal(sas_ha->core.shost->transportt);
240 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
242 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
243 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
244 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
249 int sas_set_phy_speed(struct sas_phy *phy,
250 struct sas_phy_linkrates *rates)
254 if ((rates->minimum_linkrate &&
255 rates->minimum_linkrate > phy->maximum_linkrate) ||
256 (rates->maximum_linkrate &&
257 rates->maximum_linkrate < phy->minimum_linkrate))
260 if (rates->minimum_linkrate &&
261 rates->minimum_linkrate < phy->minimum_linkrate_hw)
262 rates->minimum_linkrate = phy->minimum_linkrate_hw;
264 if (rates->maximum_linkrate &&
265 rates->maximum_linkrate > phy->maximum_linkrate_hw)
266 rates->maximum_linkrate = phy->maximum_linkrate_hw;
268 if (scsi_is_sas_phy_local(phy)) {
269 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
270 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
271 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
272 struct sas_internal *i =
273 to_sas_internal(sas_ha->core.shost->transportt);
275 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
278 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
279 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
280 ret = sas_smp_phy_control(ddev, phy->number,
281 PHY_FUNC_LINK_RESET, rates);
288 static struct sas_function_template sft = {
289 .phy_enable = sas_phy_enable,
290 .phy_reset = sas_phy_reset,
291 .set_phy_speed = sas_set_phy_speed,
292 .get_linkerrors = sas_get_linkerrors,
293 .smp_handler = sas_smp_handler,
296 struct scsi_transport_template *
297 sas_domain_attach_transport(struct sas_domain_function_template *dft)
299 struct scsi_transport_template *stt = sas_attach_transport(&sft);
300 struct sas_internal *i;
305 i = to_sas_internal(stt);
307 stt->create_work_queue = 1;
308 stt->eh_timed_out = sas_scsi_timed_out;
309 stt->eh_strategy_handler = sas_scsi_recover_host;
313 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
316 void sas_domain_release_transport(struct scsi_transport_template *stt)
318 sas_release_transport(stt);
320 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
322 /* ---------- SAS Class register/unregister ---------- */
324 static int __init sas_class_init(void)
326 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
333 static void __exit sas_class_exit(void)
335 kmem_cache_destroy(sas_task_cache);
338 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
339 MODULE_DESCRIPTION("SAS Transport Layer");
340 MODULE_LICENSE("GPL v2");
342 module_init(sas_class_init);
343 module_exit(sas_class_exit);
345 EXPORT_SYMBOL_GPL(sas_register_ha);
346 EXPORT_SYMBOL_GPL(sas_unregister_ha);