[SCSI] libsas: convert ha->state to flags
[firefly-linux-kernel-4.4.55.git] / drivers / scsi / libsas / sas_init.c
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/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
40 static struct kmem_cache *sas_task_cache;
41
42 struct sas_task *sas_alloc_task(gfp_t flags)
43 {
44         struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
45
46         if (task) {
47                 INIT_LIST_HEAD(&task->list);
48                 spin_lock_init(&task->task_state_lock);
49                 task->task_state_flags = SAS_TASK_STATE_PENDING;
50                 init_timer(&task->timer);
51                 init_completion(&task->completion);
52         }
53
54         return task;
55 }
56 EXPORT_SYMBOL_GPL(sas_alloc_task);
57
58 void sas_free_task(struct sas_task *task)
59 {
60         if (task) {
61                 BUG_ON(!list_empty(&task->list));
62                 kmem_cache_free(sas_task_cache, task);
63         }
64 }
65 EXPORT_SYMBOL_GPL(sas_free_task);
66
67 /*------------ SAS addr hash -----------*/
68 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
69 {
70         const u32 poly = 0x00DB2777;
71         u32     r = 0;
72         int     i;
73
74         for (i = 0; i < 8; i++) {
75                 int b;
76                 for (b = 7; b >= 0; b--) {
77                         r <<= 1;
78                         if ((1 << b) & sas_addr[i]) {
79                                 if (!(r & 0x01000000))
80                                         r ^= poly;
81                         } else if (r & 0x01000000)
82                                 r ^= poly;
83                 }
84         }
85
86         hashed[0] = (r >> 16) & 0xFF;
87         hashed[1] = (r >> 8) & 0xFF ;
88         hashed[2] = r & 0xFF;
89 }
90
91
92 /* ---------- HA events ---------- */
93
94 void sas_hae_reset(struct work_struct *work)
95 {
96         struct sas_ha_event *ev =
97                 container_of(work, struct sas_ha_event, work);
98         struct sas_ha_struct *ha = ev->ha;
99
100         clear_bit(HAE_RESET, &ha->pending);
101 }
102
103 int sas_register_ha(struct sas_ha_struct *sas_ha)
104 {
105         int error = 0;
106
107         spin_lock_init(&sas_ha->phy_port_lock);
108         sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
109
110         if (sas_ha->lldd_queue_size == 0)
111                 sas_ha->lldd_queue_size = 1;
112         else if (sas_ha->lldd_queue_size == -1)
113                 sas_ha->lldd_queue_size = 128; /* Sanity */
114
115         set_bit(SAS_HA_REGISTERED, &sas_ha->state);
116         spin_lock_init(&sas_ha->state_lock);
117
118         error = sas_register_phys(sas_ha);
119         if (error) {
120                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
121                 return error;
122         }
123
124         error = sas_register_ports(sas_ha);
125         if (error) {
126                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
127                 goto Undo_phys;
128         }
129
130         error = sas_init_events(sas_ha);
131         if (error) {
132                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
133                 goto Undo_ports;
134         }
135
136         if (sas_ha->lldd_max_execute_num > 1) {
137                 error = sas_init_queue(sas_ha);
138                 if (error) {
139                         printk(KERN_NOTICE "couldn't start queue thread:%d, "
140                                "running in direct mode\n", error);
141                         sas_ha->lldd_max_execute_num = 1;
142                 }
143         }
144
145         INIT_LIST_HEAD(&sas_ha->eh_done_q);
146
147         return 0;
148
149 Undo_ports:
150         sas_unregister_ports(sas_ha);
151 Undo_phys:
152
153         return error;
154 }
155
156 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
157 {
158         unsigned long flags;
159
160         /* Set the state to unregistered to avoid further
161          * events to be queued */
162         spin_lock_irqsave(&sas_ha->state_lock, flags);
163         clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
164         spin_unlock_irqrestore(&sas_ha->state_lock, flags);
165         scsi_flush_work(sas_ha->core.shost);
166
167         sas_unregister_ports(sas_ha);
168
169         if (sas_ha->lldd_max_execute_num > 1) {
170                 sas_shutdown_queue(sas_ha);
171                 sas_ha->lldd_max_execute_num = 1;
172         }
173
174         return 0;
175 }
176
177 static int sas_get_linkerrors(struct sas_phy *phy)
178 {
179         if (scsi_is_sas_phy_local(phy)) {
180                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
181                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
182                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
183                 struct sas_internal *i =
184                         to_sas_internal(sas_ha->core.shost->transportt);
185
186                 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
187         }
188
189         return sas_smp_get_phy_events(phy);
190 }
191
192 int sas_phy_enable(struct sas_phy *phy, int enable)
193 {
194         int ret;
195         enum phy_func command;
196
197         if (enable)
198                 command = PHY_FUNC_LINK_RESET;
199         else
200                 command = PHY_FUNC_DISABLE;
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                 if (!enable) {
210                         sas_phy_disconnected(asd_phy);
211                         sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
212                 }
213                 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
214         } else {
215                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
216                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
217                 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
218         }
219         return ret;
220 }
221
222 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
223 {
224         int ret;
225         enum phy_func reset_type;
226
227         if (hard_reset)
228                 reset_type = PHY_FUNC_HARD_RESET;
229         else
230                 reset_type = PHY_FUNC_LINK_RESET;
231
232         if (scsi_is_sas_phy_local(phy)) {
233                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
234                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
235                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
236                 struct sas_internal *i =
237                         to_sas_internal(sas_ha->core.shost->transportt);
238
239                 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
240         } else {
241                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
242                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
243                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
244         }
245         return ret;
246 }
247
248 int sas_set_phy_speed(struct sas_phy *phy,
249                       struct sas_phy_linkrates *rates)
250 {
251         int ret;
252
253         if ((rates->minimum_linkrate &&
254              rates->minimum_linkrate > phy->maximum_linkrate) ||
255             (rates->maximum_linkrate &&
256              rates->maximum_linkrate < phy->minimum_linkrate))
257                 return -EINVAL;
258
259         if (rates->minimum_linkrate &&
260             rates->minimum_linkrate < phy->minimum_linkrate_hw)
261                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
262
263         if (rates->maximum_linkrate &&
264             rates->maximum_linkrate > phy->maximum_linkrate_hw)
265                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
266
267         if (scsi_is_sas_phy_local(phy)) {
268                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
269                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
270                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
271                 struct sas_internal *i =
272                         to_sas_internal(sas_ha->core.shost->transportt);
273
274                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
275                                                rates);
276         } else {
277                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
278                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
279                 ret = sas_smp_phy_control(ddev, phy->number,
280                                           PHY_FUNC_LINK_RESET, rates);
281
282         }
283
284         return ret;
285 }
286
287 static struct sas_function_template sft = {
288         .phy_enable = sas_phy_enable,
289         .phy_reset = sas_phy_reset,
290         .set_phy_speed = sas_set_phy_speed,
291         .get_linkerrors = sas_get_linkerrors,
292         .smp_handler = sas_smp_handler,
293 };
294
295 struct scsi_transport_template *
296 sas_domain_attach_transport(struct sas_domain_function_template *dft)
297 {
298         struct scsi_transport_template *stt = sas_attach_transport(&sft);
299         struct sas_internal *i;
300
301         if (!stt)
302                 return stt;
303
304         i = to_sas_internal(stt);
305         i->dft = dft;
306         stt->create_work_queue = 1;
307         stt->eh_timed_out = sas_scsi_timed_out;
308         stt->eh_strategy_handler = sas_scsi_recover_host;
309
310         return stt;
311 }
312 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
313
314
315 void sas_domain_release_transport(struct scsi_transport_template *stt)
316 {
317         sas_release_transport(stt);
318 }
319 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
320
321 /* ---------- SAS Class register/unregister ---------- */
322
323 static int __init sas_class_init(void)
324 {
325         sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
326         if (!sas_task_cache)
327                 return -ENOMEM;
328
329         return 0;
330 }
331
332 static void __exit sas_class_exit(void)
333 {
334         kmem_cache_destroy(sas_task_cache);
335 }
336
337 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
338 MODULE_DESCRIPTION("SAS Transport Layer");
339 MODULE_LICENSE("GPL v2");
340
341 module_init(sas_class_init);
342 module_exit(sas_class_exit);
343
344 EXPORT_SYMBOL_GPL(sas_register_ha);
345 EXPORT_SYMBOL_GPL(sas_unregister_ha);