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