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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
40struct kmem_cache *sas_task_cache;
41
42
43void 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
68
69void sas_hae_reset(struct work_struct *work)
70{
71 struct sas_ha_event *ev =
72 container_of(work, struct sas_ha_event, work);
73 struct sas_ha_struct *ha = ev->ha;
74
75 sas_begin_event(HAE_RESET, &ha->event_lock,
76 &ha->pending);
77}
78
79int 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;
90
91 sas_ha->state = SAS_HA_REGISTERED;
92 spin_lock_init(&sas_ha->state_lock);
93
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
121 INIT_LIST_HEAD(&sas_ha->eh_done_q);
122
123 return 0;
124
125Undo_ports:
126 sas_unregister_ports(sas_ha);
127Undo_phys:
128
129 return error;
130}
131
132int sas_unregister_ha(struct sas_ha_struct *sas_ha)
133{
134 unsigned long flags;
135
136
137
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
143 sas_unregister_ports(sas_ha);
144
145 if (sas_ha->lldd_max_execute_num > 1) {
146 sas_shutdown_queue(sas_ha);
147 sas_ha->lldd_max_execute_num = 1;
148 }
149
150 return 0;
151}
152
153static int sas_get_linkerrors(struct sas_phy *phy)
154{
155 if (scsi_is_sas_phy_local(phy))
156
157
158 return -EINVAL;
159
160 return sas_smp_get_phy_events(phy);
161}
162
163int 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
193int sas_phy_reset(struct sas_phy *phy, int hard_reset)
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
210 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
211 } else {
212 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
213 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
214 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
215 }
216 return ret;
217}
218
219int sas_set_phy_speed(struct sas_phy *phy,
220 struct sas_phy_linkrates *rates)
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
258static struct sas_function_template sft = {
259 .phy_enable = sas_phy_enable,
260 .phy_reset = sas_phy_reset,
261 .set_phy_speed = sas_set_phy_speed,
262 .get_linkerrors = sas_get_linkerrors,
263 .smp_handler = sas_smp_handler,
264};
265
266struct scsi_transport_template *
267sas_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}
283EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
284
285
286void sas_domain_release_transport(struct scsi_transport_template *stt)
287{
288 sas_release_transport(stt);
289}
290EXPORT_SYMBOL_GPL(sas_domain_release_transport);
291
292
293
294static int __init sas_class_init(void)
295{
296 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
297 0, SLAB_HWCACHE_ALIGN, NULL);
298 if (!sas_task_cache)
299 return -ENOMEM;
300
301 return 0;
302}
303
304static void __exit sas_class_exit(void)
305{
306 kmem_cache_destroy(sas_task_cache);
307}
308
309MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
310MODULE_DESCRIPTION("SAS Transport Layer");
311MODULE_LICENSE("GPL v2");
312
313module_init(sas_class_init);
314module_exit(sas_class_exit);
315
316EXPORT_SYMBOL_GPL(sas_register_ha);
317EXPORT_SYMBOL_GPL(sas_unregister_ha);
318
