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/init.h>
28 #include <linux/device.h>
29 #include <linux/spinlock.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_sas.h>
34
35 #include "sas_internal.h"
36
37 #include "../scsi_sas_internal.h"
38
39 struct kmem_cache *sas_task_cache;
40
41 /*------------ SAS addr hash -----------*/
42 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
43 {
44 const u32 poly = 0x00DB2777;
45 u32 r = 0;
46 int i;
47
48 for (i = 0; i < 8; i++) {
49 int b;
50 for (b = 7; b >= 0; b--) {
51 r <<= 1;
52 if ((1 << b) & sas_addr[i]) {
53 if (!(r & 0x01000000))
54 r ^= poly;
55 } else if (r & 0x01000000)
56 r ^= poly;
57 }
58 }
59
60 hashed[0] = (r >> 16) & 0xFF;
61 hashed[1] = (r >> 8) & 0xFF ;
62 hashed[2] = r & 0xFF;
63 }
64
65
66 /* ---------- HA events ---------- */
67
68 void sas_hae_reset(struct work_struct *work)
69 {
70 struct sas_ha_event *ev =
71 container_of(work, struct sas_ha_event, work);
72 struct sas_ha_struct *ha = ev->ha;
73
74 sas_begin_event(HAE_RESET, &ha->event_lock,
75 &ha->pending);
76 }
77
78 int sas_register_ha(struct sas_ha_struct *sas_ha)
79 {
80 int error = 0;
81
82 spin_lock_init(&sas_ha->phy_port_lock);
83 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
84
85 if (sas_ha->lldd_queue_size == 0)
86 sas_ha->lldd_queue_size = 1;
87 else if (sas_ha->lldd_queue_size == -1)
88 sas_ha->lldd_queue_size = 128; /* Sanity */
89
90 sas_ha->state = SAS_HA_REGISTERED;
91 spin_lock_init(&sas_ha->state_lock);
92
93 error = sas_register_phys(sas_ha);
94 if (error) {
95 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
96 return error;
97 }
98
99 error = sas_register_ports(sas_ha);
100 if (error) {
101 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
102 goto Undo_phys;
103 }
104
105 error = sas_init_events(sas_ha);
106 if (error) {
107 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
108 goto Undo_ports;
109 }
110
111 if (sas_ha->lldd_max_execute_num > 1) {
112 error = sas_init_queue(sas_ha);
113 if (error) {
114 printk(KERN_NOTICE "couldn't start queue thread:%d, "
115 "running in direct mode\n", error);
116 sas_ha->lldd_max_execute_num = 1;
117 }
118 }
119
120 INIT_LIST_HEAD(&sas_ha->eh_done_q);
121
122 return 0;
123
124 Undo_ports:
125 sas_unregister_ports(sas_ha);
126 Undo_phys:
127
128 return error;
129 }
130
131 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
132 {
133 unsigned long flags;
134
135 /* Set the state to unregistered to avoid further
136 * events to be queued */
137 spin_lock_irqsave(&sas_ha->state_lock, flags);
138 sas_ha->state = SAS_HA_UNREGISTERED;
139 spin_unlock_irqrestore(&sas_ha->state_lock, flags);
140 scsi_flush_work(sas_ha->core.shost);
141
142 sas_unregister_ports(sas_ha);
143
144 if (sas_ha->lldd_max_execute_num > 1) {
145 sas_shutdown_queue(sas_ha);
146 sas_ha->lldd_max_execute_num = 1;
147 }
148
149 return 0;
150 }
151
152 static int sas_get_linkerrors(struct sas_phy *phy)
153 {
154 if (scsi_is_sas_phy_local(phy))
155 /* FIXME: we have no local phy stats
156 * gathering at this time */
157 return -EINVAL;
158
159 return sas_smp_get_phy_events(phy);
160 }
161
162 int sas_phy_enable(struct sas_phy *phy, int enable)
163 {
164 int ret;
165 enum phy_func command;
166
167 if (enable)
168 command = PHY_FUNC_LINK_RESET;
169 else
170 command = PHY_FUNC_DISABLE;
171
172 if (scsi_is_sas_phy_local(phy)) {
173 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
174 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
175 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
176 struct sas_internal *i =
177 to_sas_internal(sas_ha->core.shost->transportt);
178
179 if (!enable) {
180 sas_phy_disconnected(asd_phy);
181 sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
182 }
183 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
184 } else {
185 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
186 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
187 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
188 }
189 return ret;
190 }
191
192 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
193 {
194 int ret;
195 enum phy_func reset_type;
196
197 if (hard_reset)
198 reset_type = PHY_FUNC_HARD_RESET;
199 else
200 reset_type = PHY_FUNC_LINK_RESET;
201
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);
208
209 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
210 } else {
211 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
212 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
213 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
214 }
215 return ret;
216 }
217
218 int sas_set_phy_speed(struct sas_phy *phy,
219 struct sas_phy_linkrates *rates)
220 {
221 int ret;
222
223 if ((rates->minimum_linkrate &&
224 rates->minimum_linkrate > phy->maximum_linkrate) ||
225 (rates->maximum_linkrate &&
226 rates->maximum_linkrate < phy->minimum_linkrate))
227 return -EINVAL;
228
229 if (rates->minimum_linkrate &&
230 rates->minimum_linkrate < phy->minimum_linkrate_hw)
231 rates->minimum_linkrate = phy->minimum_linkrate_hw;
232
233 if (rates->maximum_linkrate &&
234 rates->maximum_linkrate > phy->maximum_linkrate_hw)
235 rates->maximum_linkrate = phy->maximum_linkrate_hw;
236
237 if (scsi_is_sas_phy_local(phy)) {
238 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
239 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
240 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
241 struct sas_internal *i =
242 to_sas_internal(sas_ha->core.shost->transportt);
243
244 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
245 rates);
246 } else {
247 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
248 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
249 ret = sas_smp_phy_control(ddev, phy->number,
250 PHY_FUNC_LINK_RESET, rates);
251
252 }
253
254 return ret;
255 }
256
257 static struct sas_function_template sft = {
258 .phy_enable = sas_phy_enable,
259 .phy_reset = sas_phy_reset,
260 .set_phy_speed = sas_set_phy_speed,
261 .get_linkerrors = sas_get_linkerrors,
262 .smp_handler = sas_smp_handler,
263 };
264
265 struct scsi_transport_template *
266 sas_domain_attach_transport(struct sas_domain_function_template *dft)
267 {
268 struct scsi_transport_template *stt = sas_attach_transport(&sft);
269 struct sas_internal *i;
270
271 if (!stt)
272 return stt;
273
274 i = to_sas_internal(stt);
275 i->dft = dft;
276 stt->create_work_queue = 1;
277 stt->eh_timed_out = sas_scsi_timed_out;
278 stt->eh_strategy_handler = sas_scsi_recover_host;
279
280 return stt;
281 }
282 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
283
284
285 void sas_domain_release_transport(struct scsi_transport_template *stt)
286 {
287 sas_release_transport(stt);
288 }
289 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
290
291 /* ---------- SAS Class register/unregister ---------- */
292
293 static int __init sas_class_init(void)
294 {
295 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
296 0, SLAB_HWCACHE_ALIGN, NULL);
297 if (!sas_task_cache)
298 return -ENOMEM;
299
300 return 0;
301 }
302
303 static void __exit sas_class_exit(void)
304 {
305 kmem_cache_destroy(sas_task_cache);
306 }
307
308 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
309 MODULE_DESCRIPTION("SAS Transport Layer");
310 MODULE_LICENSE("GPL v2");
311
312 module_init(sas_class_init);
313 module_exit(sas_class_exit);
314
315 EXPORT_SYMBOL_GPL(sas_register_ha);
316 EXPORT_SYMBOL_GPL(sas_unregister_ha);
317
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