d81c3b1989f7d343a6a550a064b7623e44a893ed
[linux-2.6.git] / drivers / scsi / libsas / sas_init.c
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/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_sas.h>
35
36 #include "sas_internal.h"
37
38 #include "../scsi_sas_internal.h"
39
40 static struct kmem_cache *sas_task_cache;
41
42 struct sas_task *sas_alloc_task(gfp_t flags)
43 {
44         struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
45
46         if (task) {
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);
52         }
53
54         return task;
55 }
56 EXPORT_SYMBOL_GPL(sas_alloc_task);
57
58 void sas_free_task(struct sas_task *task)
59 {
60         if (task) {
61                 BUG_ON(!list_empty(&task->list));
62                 kmem_cache_free(sas_task_cache, task);
63         }
64 }
65 EXPORT_SYMBOL_GPL(sas_free_task);
66
67 /*------------ SAS addr hash -----------*/
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 < 8; i++) {
75                 int b;
76                 for (b = 7; b >= 0; b--) {
77                         r <<= 1;
78                         if ((1 << b) & sas_addr[i]) {
79                                 if (!(r & 0x01000000))
80                                         r ^= poly;
81                         } else if (r & 0x01000000)
82                                 r ^= poly;
83                 }
84         }
85
86         hashed[0] = (r >> 16) & 0xFF;
87         hashed[1] = (r >> 8) & 0xFF ;
88         hashed[2] = r & 0xFF;
89 }
90
91
92 /* ---------- HA events ---------- */
93
94 void sas_hae_reset(struct work_struct *work)
95 {
96         struct sas_ha_event *ev =
97                 container_of(work, struct sas_ha_event, work);
98         struct sas_ha_struct *ha = ev->ha;
99
100         sas_begin_event(HAE_RESET, &ha->event_lock,
101                         &ha->pending);
102 }
103
104 int sas_register_ha(struct sas_ha_struct *sas_ha)
105 {
106         int error = 0;
107
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         sas_ha->state = SAS_HA_REGISTERED;
117         spin_lock_init(&sas_ha->state_lock);
118
119         error = sas_register_phys(sas_ha);
120         if (error) {
121                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
122                 return error;
123         }
124
125         error = sas_register_ports(sas_ha);
126         if (error) {
127                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
128                 goto Undo_phys;
129         }
130
131         error = sas_init_events(sas_ha);
132         if (error) {
133                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
134                 goto Undo_ports;
135         }
136
137         if (sas_ha->lldd_max_execute_num > 1) {
138                 error = sas_init_queue(sas_ha);
139                 if (error) {
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;
143                 }
144         }
145
146         INIT_LIST_HEAD(&sas_ha->eh_done_q);
147
148         return 0;
149
150 Undo_ports:
151         sas_unregister_ports(sas_ha);
152 Undo_phys:
153
154         return error;
155 }
156
157 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
158 {
159         unsigned long flags;
160
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);
167
168         sas_unregister_ports(sas_ha);
169
170         if (sas_ha->lldd_max_execute_num > 1) {
171                 sas_shutdown_queue(sas_ha);
172                 sas_ha->lldd_max_execute_num = 1;
173         }
174
175         return 0;
176 }
177
178 static int sas_get_linkerrors(struct sas_phy *phy)
179 {
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);
186
187                 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
188         }
189
190         return sas_smp_get_phy_events(phy);
191 }
192
193 int sas_phy_enable(struct sas_phy *phy, int enable)
194 {
195         int ret;
196         enum phy_func command;
197
198         if (enable)
199                 command = PHY_FUNC_LINK_RESET;
200         else
201                 command = PHY_FUNC_DISABLE;
202
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);
209
210                 if (!enable) {
211                         sas_phy_disconnected(asd_phy);
212                         sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
213                 }
214                 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
215         } else {
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);
219         }
220         return ret;
221 }
222
223 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
224 {
225         int ret;
226         enum phy_func reset_type;
227
228         if (hard_reset)
229                 reset_type = PHY_FUNC_HARD_RESET;
230         else
231                 reset_type = PHY_FUNC_LINK_RESET;
232
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);
239
240                 ret = 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                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
245         }
246         return ret;
247 }
248
249 int sas_set_phy_speed(struct sas_phy *phy,
250                       struct sas_phy_linkrates *rates)
251 {
252         int ret;
253
254         if ((rates->minimum_linkrate &&
255              rates->minimum_linkrate > phy->maximum_linkrate) ||
256             (rates->maximum_linkrate &&
257              rates->maximum_linkrate < phy->minimum_linkrate))
258                 return -EINVAL;
259
260         if (rates->minimum_linkrate &&
261             rates->minimum_linkrate < phy->minimum_linkrate_hw)
262                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
263
264         if (rates->maximum_linkrate &&
265             rates->maximum_linkrate > phy->maximum_linkrate_hw)
266                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
267
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);
274
275                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
276                                                rates);
277         } else {
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);
282
283         }
284
285         return ret;
286 }
287
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,
294 };
295
296 struct scsi_transport_template *
297 sas_domain_attach_transport(struct sas_domain_function_template *dft)
298 {
299         struct scsi_transport_template *stt = sas_attach_transport(&sft);
300         struct sas_internal *i;
301
302         if (!stt)
303                 return stt;
304
305         i = to_sas_internal(stt);
306         i->dft = dft;
307         stt->create_work_queue = 1;
308         stt->eh_timed_out = sas_scsi_timed_out;
309         stt->eh_strategy_handler = sas_scsi_recover_host;
310
311         return stt;
312 }
313 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
314
315
316 void sas_domain_release_transport(struct scsi_transport_template *stt)
317 {
318         sas_release_transport(stt);
319 }
320 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
321
322 /* ---------- SAS Class register/unregister ---------- */
323
324 static int __init sas_class_init(void)
325 {
326         sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
327         if (!sas_task_cache)
328                 return -ENOMEM;
329
330         return 0;
331 }
332
333 static void __exit sas_class_exit(void)
334 {
335         kmem_cache_destroy(sas_task_cache);
336 }
337
338 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
339 MODULE_DESCRIPTION("SAS Transport Layer");
340 MODULE_LICENSE("GPL v2");
341
342 module_init(sas_class_init);
343 module_exit(sas_class_exit);
344
345 EXPORT_SYMBOL_GPL(sas_register_ha);
346 EXPORT_SYMBOL_GPL(sas_unregister_ha);