Commit | Line | Data |
---|---|---|
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> | |
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 | kmem_cache_t *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 | ||
c4028958 | 68 | void sas_hae_reset(struct work_struct *work) |
2908d778 | 69 | { |
c4028958 DH |
70 | struct sas_ha_event *ev = |
71 | container_of(work, struct sas_ha_event, work); | |
72 | struct sas_ha_struct *ha = ev->ha; | |
2908d778 JB |
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 | error = sas_register_phys(sas_ha); | |
91 | if (error) { | |
92 | printk(KERN_NOTICE "couldn't register sas phys:%d\n", error); | |
93 | return error; | |
94 | } | |
95 | ||
96 | error = sas_register_ports(sas_ha); | |
97 | if (error) { | |
98 | printk(KERN_NOTICE "couldn't register sas ports:%d\n", error); | |
99 | goto Undo_phys; | |
100 | } | |
101 | ||
102 | error = sas_init_events(sas_ha); | |
103 | if (error) { | |
104 | printk(KERN_NOTICE "couldn't start event thread:%d\n", error); | |
105 | goto Undo_ports; | |
106 | } | |
107 | ||
108 | if (sas_ha->lldd_max_execute_num > 1) { | |
109 | error = sas_init_queue(sas_ha); | |
110 | if (error) { | |
111 | printk(KERN_NOTICE "couldn't start queue thread:%d, " | |
112 | "running in direct mode\n", error); | |
113 | sas_ha->lldd_max_execute_num = 1; | |
114 | } | |
115 | } | |
116 | ||
117 | return 0; | |
118 | ||
119 | Undo_ports: | |
120 | sas_unregister_ports(sas_ha); | |
121 | Undo_phys: | |
122 | ||
123 | return error; | |
124 | } | |
125 | ||
126 | int sas_unregister_ha(struct sas_ha_struct *sas_ha) | |
127 | { | |
128 | if (sas_ha->lldd_max_execute_num > 1) { | |
129 | sas_shutdown_queue(sas_ha); | |
130 | } | |
131 | ||
132 | sas_unregister_ports(sas_ha); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int sas_get_linkerrors(struct sas_phy *phy) | |
138 | { | |
139 | if (scsi_is_sas_phy_local(phy)) | |
140 | /* FIXME: we have no local phy stats | |
141 | * gathering at this time */ | |
142 | return -EINVAL; | |
143 | ||
144 | return sas_smp_get_phy_events(phy); | |
145 | } | |
146 | ||
147 | static int sas_phy_reset(struct sas_phy *phy, int hard_reset) | |
148 | { | |
149 | int ret; | |
150 | enum phy_func reset_type; | |
151 | ||
152 | if (hard_reset) | |
153 | reset_type = PHY_FUNC_HARD_RESET; | |
154 | else | |
155 | reset_type = PHY_FUNC_LINK_RESET; | |
156 | ||
157 | if (scsi_is_sas_phy_local(phy)) { | |
158 | struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); | |
159 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
160 | struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; | |
161 | struct sas_internal *i = | |
162 | to_sas_internal(sas_ha->core.shost->transportt); | |
163 | ||
a01e70e5 | 164 | ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); |
2908d778 JB |
165 | } else { |
166 | struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); | |
167 | struct domain_device *ddev = sas_find_dev_by_rphy(rphy); | |
a01e70e5 | 168 | ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); |
2908d778 JB |
169 | } |
170 | return ret; | |
171 | } | |
172 | ||
a01e70e5 JB |
173 | static int sas_set_phy_speed(struct sas_phy *phy, |
174 | struct sas_phy_linkrates *rates) | |
175 | { | |
176 | int ret; | |
177 | ||
178 | if ((rates->minimum_linkrate && | |
179 | rates->minimum_linkrate > phy->maximum_linkrate) || | |
180 | (rates->maximum_linkrate && | |
181 | rates->maximum_linkrate < phy->minimum_linkrate)) | |
182 | return -EINVAL; | |
183 | ||
184 | if (rates->minimum_linkrate && | |
185 | rates->minimum_linkrate < phy->minimum_linkrate_hw) | |
186 | rates->minimum_linkrate = phy->minimum_linkrate_hw; | |
187 | ||
188 | if (rates->maximum_linkrate && | |
189 | rates->maximum_linkrate > phy->maximum_linkrate_hw) | |
190 | rates->maximum_linkrate = phy->maximum_linkrate_hw; | |
191 | ||
192 | if (scsi_is_sas_phy_local(phy)) { | |
193 | struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); | |
194 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
195 | struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; | |
196 | struct sas_internal *i = | |
197 | to_sas_internal(sas_ha->core.shost->transportt); | |
198 | ||
199 | ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, | |
200 | rates); | |
201 | } else { | |
202 | struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); | |
203 | struct domain_device *ddev = sas_find_dev_by_rphy(rphy); | |
204 | ret = sas_smp_phy_control(ddev, phy->number, | |
205 | PHY_FUNC_LINK_RESET, rates); | |
206 | ||
207 | } | |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
2908d778 JB |
212 | static struct sas_function_template sft = { |
213 | .phy_reset = sas_phy_reset, | |
a01e70e5 | 214 | .set_phy_speed = sas_set_phy_speed, |
2908d778 JB |
215 | .get_linkerrors = sas_get_linkerrors, |
216 | }; | |
217 | ||
218 | struct scsi_transport_template * | |
219 | sas_domain_attach_transport(struct sas_domain_function_template *dft) | |
220 | { | |
221 | struct scsi_transport_template *stt = sas_attach_transport(&sft); | |
222 | struct sas_internal *i; | |
223 | ||
224 | if (!stt) | |
225 | return stt; | |
226 | ||
227 | i = to_sas_internal(stt); | |
228 | i->dft = dft; | |
229 | stt->create_work_queue = 1; | |
230 | stt->eh_timed_out = sas_scsi_timed_out; | |
231 | stt->eh_strategy_handler = sas_scsi_recover_host; | |
232 | ||
233 | return stt; | |
234 | } | |
235 | EXPORT_SYMBOL_GPL(sas_domain_attach_transport); | |
236 | ||
237 | ||
238 | void sas_domain_release_transport(struct scsi_transport_template *stt) | |
239 | { | |
240 | sas_release_transport(stt); | |
241 | } | |
242 | EXPORT_SYMBOL_GPL(sas_domain_release_transport); | |
243 | ||
244 | /* ---------- SAS Class register/unregister ---------- */ | |
245 | ||
246 | static int __init sas_class_init(void) | |
247 | { | |
248 | sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), | |
249 | 0, SLAB_HWCACHE_ALIGN, NULL, NULL); | |
250 | if (!sas_task_cache) | |
251 | return -ENOMEM; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static void __exit sas_class_exit(void) | |
257 | { | |
258 | kmem_cache_destroy(sas_task_cache); | |
259 | } | |
260 | ||
261 | MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); | |
262 | MODULE_DESCRIPTION("SAS Transport Layer"); | |
263 | MODULE_LICENSE("GPL v2"); | |
264 | ||
265 | module_init(sas_class_init); | |
266 | module_exit(sas_class_exit); | |
267 | ||
268 | EXPORT_SYMBOL_GPL(sas_register_ha); | |
269 | EXPORT_SYMBOL_GPL(sas_unregister_ha); |