1 /*
2 * Serial Attached SCSI (SAS) Port class
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 *
23 */
24
25 #include "sas_internal.h"
26
27 #include <scsi/scsi_transport.h>
28 #include <scsi/scsi_transport_sas.h>
29 #include "../scsi_sas_internal.h"
30
31 /**
32 * sas_form_port -- add this phy to a port
33 * @phy: the phy of interest
34 *
35 * This function adds this phy to an existing port, thus creating a wide
36 * port, or it creates a port and adds the phy to the port.
37 */
38 static void sas_form_port(struct asd_sas_phy *phy)
39 {
40 int i;
41 struct sas_ha_struct *sas_ha = phy->ha;
42 struct asd_sas_port *port = phy->port;
43 struct sas_internal *si =
44 to_sas_internal(sas_ha->core.shost->transportt);
45 unsigned long flags;
46
47 if (port) {
48 if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
49 SAS_ADDR_SIZE) != 0)
50 sas_deform_port(phy);
51 else {
52 SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
53 __func__, phy->id, phy->port->id,
54 phy->port->num_phys);
55 return;
56 }
57 }
58
59 /* see if the phy should be part of a wide port */
60 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
61 for (i = 0; i < sas_ha->num_phys; i++) {
62 port = sas_ha->sas_port[i];
63 spin_lock(&port->phy_list_lock);
64 if (*(u64 *) port->sas_addr &&
65 memcmp(port->attached_sas_addr,
66 phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 &&
67 port->num_phys > 0) {
68 /* wide port */
69 SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
70 port->id);
71 break;
72 }
73 spin_unlock(&port->phy_list_lock);
74 }
75 /* The phy does not match any existing port, create a new one */
76 if (i == sas_ha->num_phys) {
77 for (i = 0; i < sas_ha->num_phys; i++) {
78 port = sas_ha->sas_port[i];
79 spin_lock(&port->phy_list_lock);
80 if (*(u64 *)port->sas_addr == 0
81 && port->num_phys == 0) {
82 memcpy(port->sas_addr, phy->sas_addr,
83 SAS_ADDR_SIZE);
84 break;
85 }
86 spin_unlock(&port->phy_list_lock);
87 }
88 }
89
90 if (i >= sas_ha->num_phys) {
91 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
92 __func__);
93 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
94 return;
95 }
96
97 /* add the phy to the port */
98 list_add_tail(&phy->port_phy_el, &port->phy_list);
99 phy->port = port;
100 port->num_phys++;
101 port->phy_mask |= (1U << phy->id);
102
103 if (!port->phy)
104 port->phy = phy->phy;
105
106 if (*(u64 *)port->attached_sas_addr == 0) {
107 port->class = phy->class;
108 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
109 SAS_ADDR_SIZE);
110 port->iproto = phy->iproto;
111 port->tproto = phy->tproto;
112 port->oob_mode = phy->oob_mode;
113 port->linkrate = phy->linkrate;
114 } else
115 port->linkrate = max(port->linkrate, phy->linkrate);
116 spin_unlock(&port->phy_list_lock);
117 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
118
119 if (!port->port) {
120 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
121 BUG_ON(!port->port);
122 sas_port_add(port->port);
123 }
124 sas_port_add_phy(port->port, phy->phy);
125
126 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
127 dev_name(&phy->phy->dev), dev_name(&port->port->dev),
128 port->phy_mask,
129 SAS_ADDR(port->attached_sas_addr));
130
131 if (port->port_dev)
132 port->port_dev->pathways = port->num_phys;
133
134 /* Tell the LLDD about this port formation. */
135 if (si->dft->lldd_port_formed)
136 si->dft->lldd_port_formed(phy);
137
138 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
139 }
140
141 /**
142 * sas_deform_port -- remove this phy from the port it belongs to
143 * @phy: the phy of interest
144 *
145 * This is called when the physical link to the other phy has been
146 * lost (on this phy), in Event thread context. We cannot delay here.
147 */
148 void sas_deform_port(struct asd_sas_phy *phy)
149 {
150 struct sas_ha_struct *sas_ha = phy->ha;
151 struct asd_sas_port *port = phy->port;
152 struct sas_internal *si =
153 to_sas_internal(sas_ha->core.shost->transportt);
154 unsigned long flags;
155
156 if (!port)
157 return; /* done by a phy event */
158
159 if (port->port_dev)
160 port->port_dev->pathways--;
161
162 if (port->num_phys == 1) {
163 sas_unregister_domain_devices(port);
164 sas_port_delete(port->port);
165 port->port = NULL;
166 } else
167 sas_port_delete_phy(port->port, phy->phy);
168
169
170 if (si->dft->lldd_port_deformed)
171 si->dft->lldd_port_deformed(phy);
172
173 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
174 spin_lock(&port->phy_list_lock);
175
176 list_del_init(&phy->port_phy_el);
177 phy->port = NULL;
178 port->num_phys--;
179 port->phy_mask &= ~(1U << phy->id);
180
181 if (port->num_phys == 0) {
182 INIT_LIST_HEAD(&port->phy_list);
183 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
184 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
185 port->class = 0;
186 port->iproto = 0;
187 port->tproto = 0;
188 port->oob_mode = 0;
189 port->phy_mask = 0;
190 }
191 spin_unlock(&port->phy_list_lock);
192 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
193
194 return;
195 }
196
197 /* ---------- SAS port events ---------- */
198
199 void sas_porte_bytes_dmaed(struct work_struct *work)
200 {
201 struct asd_sas_event *ev =
202 container_of(work, struct asd_sas_event, work);
203 struct asd_sas_phy *phy = ev->phy;
204
205 sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
206 &phy->port_events_pending);
207
208 sas_form_port(phy);
209 }
210
211 void sas_porte_broadcast_rcvd(struct work_struct *work)
212 {
213 struct asd_sas_event *ev =
214 container_of(work, struct asd_sas_event, work);
215 struct asd_sas_phy *phy = ev->phy;
216 unsigned long flags;
217 u32 prim;
218
219 sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
220 &phy->port_events_pending);
221
222 spin_lock_irqsave(&phy->sas_prim_lock, flags);
223 prim = phy->sas_prim;
224 spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
225
226 SAS_DPRINTK("broadcast received: %d\n", prim);
227 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
228 }
229
230 void sas_porte_link_reset_err(struct work_struct *work)
231 {
232 struct asd_sas_event *ev =
233 container_of(work, struct asd_sas_event, work);
234 struct asd_sas_phy *phy = ev->phy;
235
236 sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
237 &phy->port_events_pending);
238
239 sas_deform_port(phy);
240 }
241
242 void sas_porte_timer_event(struct work_struct *work)
243 {
244 struct asd_sas_event *ev =
245 container_of(work, struct asd_sas_event, work);
246 struct asd_sas_phy *phy = ev->phy;
247
248 sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
249 &phy->port_events_pending);
250
251 sas_deform_port(phy);
252 }
253
254 void sas_porte_hard_reset(struct work_struct *work)
255 {
256 struct asd_sas_event *ev =
257 container_of(work, struct asd_sas_event, work);
258 struct asd_sas_phy *phy = ev->phy;
259
260 sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
261 &phy->port_events_pending);
262
263 sas_deform_port(phy);
264 }
265
266 /* ---------- SAS port registration ---------- */
267
268 static void sas_init_port(struct asd_sas_port *port,
269 struct sas_ha_struct *sas_ha, int i)
270 {
271 memset(port, 0, sizeof(*port));
272 port->id = i;
273 INIT_LIST_HEAD(&port->dev_list);
274 spin_lock_init(&port->phy_list_lock);
275 INIT_LIST_HEAD(&port->phy_list);
276 port->ha = sas_ha;
277
278 spin_lock_init(&port->dev_list_lock);
279 }
280
281 int sas_register_ports(struct sas_ha_struct *sas_ha)
282 {
283 int i;
284
285 /* initialize the ports and discovery */
286 for (i = 0; i < sas_ha->num_phys; i++) {
287 struct asd_sas_port *port = sas_ha->sas_port[i];
288
289 sas_init_port(port, sas_ha, i);
290 sas_init_disc(&port->disc, port);
291 }
292 return 0;
293 }
294
295 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
296 {
297 int i;
298
299 for (i = 0; i < sas_ha->num_phys; i++)
300 if (sas_ha->sas_phy[i]->port)
301 sas_deform_port(sas_ha->sas_phy[i]);
302
303 }
304
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