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2908d778 JB |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
2908d778 JB |
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 | ||
e18b890b | 40 | struct kmem_cache *sas_task_cache; |
2908d778 JB |
41 | |
42 | /*------------ SAS addr hash -----------*/ | |
43 | void sas_hash_addr(u8 *hashed, const u8 *sas_addr) | |
44 | { | |
45 | const u32 poly = 0x00DB2777; | |
46 | u32 r = 0; | |
47 | int i; | |
48 | ||
49 | for (i = 0; i < 8; i++) { | |
50 | int b; | |
51 | for (b = 7; b >= 0; b--) { | |
52 | r <<= 1; | |
53 | if ((1 << b) & sas_addr[i]) { | |
54 | if (!(r & 0x01000000)) | |
55 | r ^= poly; | |
56 | } else if (r & 0x01000000) | |
57 | r ^= poly; | |
58 | } | |
59 | } | |
60 | ||
61 | hashed[0] = (r >> 16) & 0xFF; | |
62 | hashed[1] = (r >> 8) & 0xFF ; | |
63 | hashed[2] = r & 0xFF; | |
64 | } | |
65 | ||
66 | ||
67 | /* ---------- HA events ---------- */ | |
68 | ||
c4028958 | 69 | void sas_hae_reset(struct work_struct *work) |
2908d778 | 70 | { |
c4028958 DH |
71 | struct sas_ha_event *ev = |
72 | container_of(work, struct sas_ha_event, work); | |
73 | struct sas_ha_struct *ha = ev->ha; | |
2908d778 JB |
74 | |
75 | sas_begin_event(HAE_RESET, &ha->event_lock, | |
76 | &ha->pending); | |
77 | } | |
78 | ||
79 | int sas_register_ha(struct sas_ha_struct *sas_ha) | |
80 | { | |
81 | int error = 0; | |
82 | ||
83 | spin_lock_init(&sas_ha->phy_port_lock); | |
84 | sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr); | |
85 | ||
86 | if (sas_ha->lldd_queue_size == 0) | |
87 | sas_ha->lldd_queue_size = 1; | |
88 | else if (sas_ha->lldd_queue_size == -1) | |
89 | sas_ha->lldd_queue_size = 128; /* Sanity */ | |
90 | ||
6b0efb85 DW |
91 | sas_ha->state = SAS_HA_REGISTERED; |
92 | spin_lock_init(&sas_ha->state_lock); | |
93 | ||
2908d778 JB |
94 | error = sas_register_phys(sas_ha); |
95 | if (error) { | |
96 | printk(KERN_NOTICE "couldn't register sas phys:%d\n", error); | |
97 | return error; | |
98 | } | |
99 | ||
100 | error = sas_register_ports(sas_ha); | |
101 | if (error) { | |
102 | printk(KERN_NOTICE "couldn't register sas ports:%d\n", error); | |
103 | goto Undo_phys; | |
104 | } | |
105 | ||
106 | error = sas_init_events(sas_ha); | |
107 | if (error) { | |
108 | printk(KERN_NOTICE "couldn't start event thread:%d\n", error); | |
109 | goto Undo_ports; | |
110 | } | |
111 | ||
112 | if (sas_ha->lldd_max_execute_num > 1) { | |
113 | error = sas_init_queue(sas_ha); | |
114 | if (error) { | |
115 | printk(KERN_NOTICE "couldn't start queue thread:%d, " | |
116 | "running in direct mode\n", error); | |
117 | sas_ha->lldd_max_execute_num = 1; | |
118 | } | |
119 | } | |
120 | ||
f456393e DW |
121 | INIT_LIST_HEAD(&sas_ha->eh_done_q); |
122 | ||
2908d778 JB |
123 | return 0; |
124 | ||
125 | Undo_ports: | |
126 | sas_unregister_ports(sas_ha); | |
127 | Undo_phys: | |
128 | ||
129 | return error; | |
130 | } | |
131 | ||
132 | int sas_unregister_ha(struct sas_ha_struct *sas_ha) | |
133 | { | |
6b0efb85 DW |
134 | unsigned long flags; |
135 | ||
136 | /* Set the state to unregistered to avoid further | |
137 | * events to be queued */ | |
138 | spin_lock_irqsave(&sas_ha->state_lock, flags); | |
139 | sas_ha->state = SAS_HA_UNREGISTERED; | |
140 | spin_unlock_irqrestore(&sas_ha->state_lock, flags); | |
141 | scsi_flush_work(sas_ha->core.shost); | |
142 | ||
cde3f74b DW |
143 | sas_unregister_ports(sas_ha); |
144 | ||
2908d778 JB |
145 | if (sas_ha->lldd_max_execute_num > 1) { |
146 | sas_shutdown_queue(sas_ha); | |
cde3f74b | 147 | sas_ha->lldd_max_execute_num = 1; |
2908d778 JB |
148 | } |
149 | ||
2908d778 JB |
150 | return 0; |
151 | } | |
152 | ||
153 | static int sas_get_linkerrors(struct sas_phy *phy) | |
154 | { | |
155 | if (scsi_is_sas_phy_local(phy)) | |
156 | /* FIXME: we have no local phy stats | |
157 | * gathering at this time */ | |
158 | return -EINVAL; | |
159 | ||
160 | return sas_smp_get_phy_events(phy); | |
161 | } | |
162 | ||
acbf167d DW |
163 | int sas_phy_enable(struct sas_phy *phy, int enable) |
164 | { | |
165 | int ret; | |
166 | enum phy_func command; | |
167 | ||
168 | if (enable) | |
169 | command = PHY_FUNC_LINK_RESET; | |
170 | else | |
171 | command = PHY_FUNC_DISABLE; | |
172 | ||
173 | if (scsi_is_sas_phy_local(phy)) { | |
174 | struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); | |
175 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
176 | struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; | |
177 | struct sas_internal *i = | |
178 | to_sas_internal(sas_ha->core.shost->transportt); | |
179 | ||
180 | if (!enable) { | |
181 | sas_phy_disconnected(asd_phy); | |
182 | sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL); | |
183 | } | |
184 | ret = i->dft->lldd_control_phy(asd_phy, command, NULL); | |
185 | } else { | |
186 | struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); | |
187 | struct domain_device *ddev = sas_find_dev_by_rphy(rphy); | |
188 | ret = sas_smp_phy_control(ddev, phy->number, command, NULL); | |
189 | } | |
190 | return ret; | |
191 | } | |
192 | ||
dea22214 | 193 | int sas_phy_reset(struct sas_phy *phy, int hard_reset) |
2908d778 JB |
194 | { |
195 | int ret; | |
196 | enum phy_func reset_type; | |
197 | ||
198 | if (hard_reset) | |
199 | reset_type = PHY_FUNC_HARD_RESET; | |
200 | else | |
201 | reset_type = PHY_FUNC_LINK_RESET; | |
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 | ||
a01e70e5 | 210 | ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); |
2908d778 JB |
211 | } else { |
212 | struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); | |
213 | struct domain_device *ddev = sas_find_dev_by_rphy(rphy); | |
a01e70e5 | 214 | ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); |
2908d778 JB |
215 | } |
216 | return ret; | |
217 | } | |
218 | ||
acbf167d DW |
219 | int sas_set_phy_speed(struct sas_phy *phy, |
220 | struct sas_phy_linkrates *rates) | |
a01e70e5 JB |
221 | { |
222 | int ret; | |
223 | ||
224 | if ((rates->minimum_linkrate && | |
225 | rates->minimum_linkrate > phy->maximum_linkrate) || | |
226 | (rates->maximum_linkrate && | |
227 | rates->maximum_linkrate < phy->minimum_linkrate)) | |
228 | return -EINVAL; | |
229 | ||
230 | if (rates->minimum_linkrate && | |
231 | rates->minimum_linkrate < phy->minimum_linkrate_hw) | |
232 | rates->minimum_linkrate = phy->minimum_linkrate_hw; | |
233 | ||
234 | if (rates->maximum_linkrate && | |
235 | rates->maximum_linkrate > phy->maximum_linkrate_hw) | |
236 | rates->maximum_linkrate = phy->maximum_linkrate_hw; | |
237 | ||
238 | if (scsi_is_sas_phy_local(phy)) { | |
239 | struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); | |
240 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
241 | struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; | |
242 | struct sas_internal *i = | |
243 | to_sas_internal(sas_ha->core.shost->transportt); | |
244 | ||
245 | ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, | |
246 | rates); | |
247 | } else { | |
248 | struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); | |
249 | struct domain_device *ddev = sas_find_dev_by_rphy(rphy); | |
250 | ret = sas_smp_phy_control(ddev, phy->number, | |
251 | PHY_FUNC_LINK_RESET, rates); | |
252 | ||
253 | } | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
2908d778 | 258 | static struct sas_function_template sft = { |
acbf167d | 259 | .phy_enable = sas_phy_enable, |
2908d778 | 260 | .phy_reset = sas_phy_reset, |
a01e70e5 | 261 | .set_phy_speed = sas_set_phy_speed, |
2908d778 | 262 | .get_linkerrors = sas_get_linkerrors, |
ba1fc175 | 263 | .smp_handler = sas_smp_handler, |
2908d778 JB |
264 | }; |
265 | ||
266 | struct scsi_transport_template * | |
267 | sas_domain_attach_transport(struct sas_domain_function_template *dft) | |
268 | { | |
269 | struct scsi_transport_template *stt = sas_attach_transport(&sft); | |
270 | struct sas_internal *i; | |
271 | ||
272 | if (!stt) | |
273 | return stt; | |
274 | ||
275 | i = to_sas_internal(stt); | |
276 | i->dft = dft; | |
277 | stt->create_work_queue = 1; | |
278 | stt->eh_timed_out = sas_scsi_timed_out; | |
279 | stt->eh_strategy_handler = sas_scsi_recover_host; | |
280 | ||
281 | return stt; | |
282 | } | |
283 | EXPORT_SYMBOL_GPL(sas_domain_attach_transport); | |
284 | ||
285 | ||
286 | void sas_domain_release_transport(struct scsi_transport_template *stt) | |
287 | { | |
288 | sas_release_transport(stt); | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(sas_domain_release_transport); | |
291 | ||
292 | /* ---------- SAS Class register/unregister ---------- */ | |
293 | ||
294 | static int __init sas_class_init(void) | |
295 | { | |
296 | sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), | |
20c2df83 | 297 | 0, SLAB_HWCACHE_ALIGN, NULL); |
2908d778 JB |
298 | if (!sas_task_cache) |
299 | return -ENOMEM; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static void __exit sas_class_exit(void) | |
305 | { | |
306 | kmem_cache_destroy(sas_task_cache); | |
307 | } | |
308 | ||
309 | MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); | |
310 | MODULE_DESCRIPTION("SAS Transport Layer"); | |
311 | MODULE_LICENSE("GPL v2"); | |
312 | ||
313 | module_init(sas_class_init); | |
314 | module_exit(sas_class_exit); | |
315 | ||
316 | EXPORT_SYMBOL_GPL(sas_register_ha); | |
317 | EXPORT_SYMBOL_GPL(sas_unregister_ha); |