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
phy_is_wideport_member(struct asd_sas_port * port,struct asd_sas_phy * phy)31 static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
32 {
33 struct sas_ha_struct *sas_ha = phy->ha;
34
35 if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
36 SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
37 memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
38 return false;
39 return true;
40 }
41
42 /**
43 * sas_form_port -- add this phy to a port
44 * @phy: the phy of interest
45 *
46 * This function adds this phy to an existing port, thus creating a wide
47 * port, or it creates a port and adds the phy to the port.
48 */
sas_form_port(struct asd_sas_phy * phy)49 static void sas_form_port(struct asd_sas_phy *phy)
50 {
51 int i;
52 struct sas_ha_struct *sas_ha = phy->ha;
53 struct asd_sas_port *port = phy->port;
54 struct sas_internal *si =
55 to_sas_internal(sas_ha->core.shost->transportt);
56 unsigned long flags;
57
58 if (port) {
59 if (!phy_is_wideport_member(port, phy))
60 sas_deform_port(phy, 0);
61 else {
62 SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
63 __func__, phy->id, phy->port->id,
64 phy->port->num_phys);
65 return;
66 }
67 }
68
69 /* see if the phy should be part of a wide port */
70 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
71 for (i = 0; i < sas_ha->num_phys; i++) {
72 port = sas_ha->sas_port[i];
73 spin_lock(&port->phy_list_lock);
74 if (*(u64 *) port->sas_addr &&
75 phy_is_wideport_member(port, phy) && port->num_phys > 0) {
76 /* wide port */
77 SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
78 port->id);
79 break;
80 }
81 spin_unlock(&port->phy_list_lock);
82 }
83 /* The phy does not match any existing port, create a new one */
84 if (i == sas_ha->num_phys) {
85 for (i = 0; i < sas_ha->num_phys; i++) {
86 port = sas_ha->sas_port[i];
87 spin_lock(&port->phy_list_lock);
88 if (*(u64 *)port->sas_addr == 0
89 && port->num_phys == 0) {
90 memcpy(port->sas_addr, phy->sas_addr,
91 SAS_ADDR_SIZE);
92 break;
93 }
94 spin_unlock(&port->phy_list_lock);
95 }
96 }
97
98 if (i >= sas_ha->num_phys) {
99 printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
100 __func__);
101 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
102 return;
103 }
104
105 /* add the phy to the port */
106 list_add_tail(&phy->port_phy_el, &port->phy_list);
107 phy->port = port;
108 port->num_phys++;
109 port->phy_mask |= (1U << phy->id);
110
111 if (!port->phy)
112 port->phy = phy->phy;
113
114 if (*(u64 *)port->attached_sas_addr == 0) {
115 port->class = phy->class;
116 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
117 SAS_ADDR_SIZE);
118 port->iproto = phy->iproto;
119 port->tproto = phy->tproto;
120 port->oob_mode = phy->oob_mode;
121 port->linkrate = phy->linkrate;
122 } else
123 port->linkrate = max(port->linkrate, phy->linkrate);
124 spin_unlock(&port->phy_list_lock);
125 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
126
127 if (!port->port) {
128 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
129 BUG_ON(!port->port);
130 sas_port_add(port->port);
131 }
132 sas_port_add_phy(port->port, phy->phy);
133
134 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
135 dev_name(&phy->phy->dev), dev_name(&port->port->dev),
136 port->phy_mask,
137 SAS_ADDR(port->attached_sas_addr));
138
139 if (port->port_dev)
140 port->port_dev->pathways = port->num_phys;
141
142 /* Tell the LLDD about this port formation. */
143 if (si->dft->lldd_port_formed)
144 si->dft->lldd_port_formed(phy);
145
146 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
147 }
148
149 /**
150 * sas_deform_port -- remove this phy from the port it belongs to
151 * @phy: the phy of interest
152 *
153 * This is called when the physical link to the other phy has been
154 * lost (on this phy), in Event thread context. We cannot delay here.
155 */
sas_deform_port(struct asd_sas_phy * phy,int gone)156 void sas_deform_port(struct asd_sas_phy *phy, int gone)
157 {
158 struct sas_ha_struct *sas_ha = phy->ha;
159 struct asd_sas_port *port = phy->port;
160 struct sas_internal *si =
161 to_sas_internal(sas_ha->core.shost->transportt);
162 struct domain_device *dev;
163 unsigned long flags;
164
165 if (!port)
166 return; /* done by a phy event */
167
168 dev = port->port_dev;
169 if (dev)
170 dev->pathways--;
171
172 if (port->num_phys == 1) {
173 if (dev && gone)
174 dev->gone = 1;
175 sas_unregister_domain_devices(port);
176 sas_port_delete(port->port);
177 port->port = NULL;
178 } else
179 sas_port_delete_phy(port->port, phy->phy);
180
181 if (si->dft->lldd_port_deformed)
182 si->dft->lldd_port_deformed(phy);
183
184 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
185 spin_lock(&port->phy_list_lock);
186
187 list_del_init(&phy->port_phy_el);
188 phy->port = NULL;
189 port->num_phys--;
190 port->phy_mask &= ~(1U << phy->id);
191
192 if (port->num_phys == 0) {
193 INIT_LIST_HEAD(&port->phy_list);
194 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
195 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
196 port->class = 0;
197 port->iproto = 0;
198 port->tproto = 0;
199 port->oob_mode = 0;
200 port->phy_mask = 0;
201 }
202 spin_unlock(&port->phy_list_lock);
203 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
204
205 return;
206 }
207
208 /* ---------- SAS port events ---------- */
209
sas_porte_bytes_dmaed(struct work_struct * work)210 void sas_porte_bytes_dmaed(struct work_struct *work)
211 {
212 struct asd_sas_event *ev =
213 container_of(work, struct asd_sas_event, work);
214 struct asd_sas_phy *phy = ev->phy;
215
216 sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
217 &phy->port_events_pending);
218
219 sas_form_port(phy);
220 }
221
sas_porte_broadcast_rcvd(struct work_struct * work)222 void sas_porte_broadcast_rcvd(struct work_struct *work)
223 {
224 struct asd_sas_event *ev =
225 container_of(work, struct asd_sas_event, work);
226 struct asd_sas_phy *phy = ev->phy;
227 unsigned long flags;
228 u32 prim;
229
230 sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
231 &phy->port_events_pending);
232
233 spin_lock_irqsave(&phy->sas_prim_lock, flags);
234 prim = phy->sas_prim;
235 spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
236
237 SAS_DPRINTK("broadcast received: %d\n", prim);
238 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
239 }
240
sas_porte_link_reset_err(struct work_struct * work)241 void sas_porte_link_reset_err(struct work_struct *work)
242 {
243 struct asd_sas_event *ev =
244 container_of(work, struct asd_sas_event, work);
245 struct asd_sas_phy *phy = ev->phy;
246
247 sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
248 &phy->port_events_pending);
249
250 sas_deform_port(phy, 1);
251 }
252
sas_porte_timer_event(struct work_struct * work)253 void sas_porte_timer_event(struct work_struct *work)
254 {
255 struct asd_sas_event *ev =
256 container_of(work, struct asd_sas_event, work);
257 struct asd_sas_phy *phy = ev->phy;
258
259 sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
260 &phy->port_events_pending);
261
262 sas_deform_port(phy, 1);
263 }
264
sas_porte_hard_reset(struct work_struct * work)265 void sas_porte_hard_reset(struct work_struct *work)
266 {
267 struct asd_sas_event *ev =
268 container_of(work, struct asd_sas_event, work);
269 struct asd_sas_phy *phy = ev->phy;
270
271 sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
272 &phy->port_events_pending);
273
274 sas_deform_port(phy, 1);
275 }
276
277 /* ---------- SAS port registration ---------- */
278
sas_init_port(struct asd_sas_port * port,struct sas_ha_struct * sas_ha,int i)279 static void sas_init_port(struct asd_sas_port *port,
280 struct sas_ha_struct *sas_ha, int i)
281 {
282 memset(port, 0, sizeof(*port));
283 port->id = i;
284 INIT_LIST_HEAD(&port->dev_list);
285 spin_lock_init(&port->phy_list_lock);
286 INIT_LIST_HEAD(&port->phy_list);
287 port->ha = sas_ha;
288
289 spin_lock_init(&port->dev_list_lock);
290 }
291
sas_register_ports(struct sas_ha_struct * sas_ha)292 int sas_register_ports(struct sas_ha_struct *sas_ha)
293 {
294 int i;
295
296 /* initialize the ports and discovery */
297 for (i = 0; i < sas_ha->num_phys; i++) {
298 struct asd_sas_port *port = sas_ha->sas_port[i];
299
300 sas_init_port(port, sas_ha, i);
301 sas_init_disc(&port->disc, port);
302 }
303 return 0;
304 }
305
sas_unregister_ports(struct sas_ha_struct * sas_ha)306 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
307 {
308 int i;
309
310 for (i = 0; i < sas_ha->num_phys; i++)
311 if (sas_ha->sas_phy[i]->port)
312 sas_deform_port(sas_ha->sas_phy[i], 0);
313
314 }
315