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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> | |
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 | ||
68 | void sas_hae_reset(void *data) | |
69 | { | |
70 | struct sas_ha_struct *ha = data; | |
71 | ||
72 | sas_begin_event(HAE_RESET, &ha->event_lock, | |
73 | &ha->pending); | |
74 | } | |
75 | ||
76 | int sas_register_ha(struct sas_ha_struct *sas_ha) | |
77 | { | |
78 | int error = 0; | |
79 | ||
80 | spin_lock_init(&sas_ha->phy_port_lock); | |
81 | sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr); | |
82 | ||
83 | if (sas_ha->lldd_queue_size == 0) | |
84 | sas_ha->lldd_queue_size = 1; | |
85 | else if (sas_ha->lldd_queue_size == -1) | |
86 | sas_ha->lldd_queue_size = 128; /* Sanity */ | |
87 | ||
88 | error = sas_register_phys(sas_ha); | |
89 | if (error) { | |
90 | printk(KERN_NOTICE "couldn't register sas phys:%d\n", error); | |
91 | return error; | |
92 | } | |
93 | ||
94 | error = sas_register_ports(sas_ha); | |
95 | if (error) { | |
96 | printk(KERN_NOTICE "couldn't register sas ports:%d\n", error); | |
97 | goto Undo_phys; | |
98 | } | |
99 | ||
100 | error = sas_init_events(sas_ha); | |
101 | if (error) { | |
102 | printk(KERN_NOTICE "couldn't start event thread:%d\n", error); | |
103 | goto Undo_ports; | |
104 | } | |
105 | ||
106 | if (sas_ha->lldd_max_execute_num > 1) { | |
107 | error = sas_init_queue(sas_ha); | |
108 | if (error) { | |
109 | printk(KERN_NOTICE "couldn't start queue thread:%d, " | |
110 | "running in direct mode\n", error); | |
111 | sas_ha->lldd_max_execute_num = 1; | |
112 | } | |
113 | } | |
114 | ||
115 | return 0; | |
116 | ||
117 | Undo_ports: | |
118 | sas_unregister_ports(sas_ha); | |
119 | Undo_phys: | |
120 | ||
121 | return error; | |
122 | } | |
123 | ||
124 | int sas_unregister_ha(struct sas_ha_struct *sas_ha) | |
125 | { | |
126 | if (sas_ha->lldd_max_execute_num > 1) { | |
127 | sas_shutdown_queue(sas_ha); | |
128 | } | |
129 | ||
130 | sas_unregister_ports(sas_ha); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static int sas_get_linkerrors(struct sas_phy *phy) | |
136 | { | |
137 | if (scsi_is_sas_phy_local(phy)) | |
138 | /* FIXME: we have no local phy stats | |
139 | * gathering at this time */ | |
140 | return -EINVAL; | |
141 | ||
142 | return sas_smp_get_phy_events(phy); | |
143 | } | |
144 | ||
145 | static int sas_phy_reset(struct sas_phy *phy, int hard_reset) | |
146 | { | |
147 | int ret; | |
148 | enum phy_func reset_type; | |
149 | ||
150 | if (hard_reset) | |
151 | reset_type = PHY_FUNC_HARD_RESET; | |
152 | else | |
153 | reset_type = PHY_FUNC_LINK_RESET; | |
154 | ||
155 | if (scsi_is_sas_phy_local(phy)) { | |
156 | struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); | |
157 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
158 | struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; | |
159 | struct sas_internal *i = | |
160 | to_sas_internal(sas_ha->core.shost->transportt); | |
161 | ||
162 | ret = i->dft->lldd_control_phy(asd_phy, reset_type); | |
163 | } else { | |
164 | struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); | |
165 | struct domain_device *ddev = sas_find_dev_by_rphy(rphy); | |
166 | ret = sas_smp_phy_control(ddev, phy->number, reset_type); | |
167 | } | |
168 | return ret; | |
169 | } | |
170 | ||
171 | static struct sas_function_template sft = { | |
172 | .phy_reset = sas_phy_reset, | |
173 | .get_linkerrors = sas_get_linkerrors, | |
174 | }; | |
175 | ||
176 | struct scsi_transport_template * | |
177 | sas_domain_attach_transport(struct sas_domain_function_template *dft) | |
178 | { | |
179 | struct scsi_transport_template *stt = sas_attach_transport(&sft); | |
180 | struct sas_internal *i; | |
181 | ||
182 | if (!stt) | |
183 | return stt; | |
184 | ||
185 | i = to_sas_internal(stt); | |
186 | i->dft = dft; | |
187 | stt->create_work_queue = 1; | |
188 | stt->eh_timed_out = sas_scsi_timed_out; | |
189 | stt->eh_strategy_handler = sas_scsi_recover_host; | |
190 | ||
191 | return stt; | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(sas_domain_attach_transport); | |
194 | ||
195 | ||
196 | void sas_domain_release_transport(struct scsi_transport_template *stt) | |
197 | { | |
198 | sas_release_transport(stt); | |
199 | } | |
200 | EXPORT_SYMBOL_GPL(sas_domain_release_transport); | |
201 | ||
202 | /* ---------- SAS Class register/unregister ---------- */ | |
203 | ||
204 | static int __init sas_class_init(void) | |
205 | { | |
206 | sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), | |
207 | 0, SLAB_HWCACHE_ALIGN, NULL, NULL); | |
208 | if (!sas_task_cache) | |
209 | return -ENOMEM; | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static void __exit sas_class_exit(void) | |
215 | { | |
216 | kmem_cache_destroy(sas_task_cache); | |
217 | } | |
218 | ||
219 | MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); | |
220 | MODULE_DESCRIPTION("SAS Transport Layer"); | |
221 | MODULE_LICENSE("GPL v2"); | |
222 | ||
223 | module_init(sas_class_init); | |
224 | module_exit(sas_class_exit); | |
225 | ||
226 | EXPORT_SYMBOL_GPL(sas_register_ha); | |
227 | EXPORT_SYMBOL_GPL(sas_unregister_ha); |