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 sas_phy_set_target(phy, port->port_dev);
108 phy->port = port;
109 port->num_phys++;
110 port->phy_mask |= (1U << phy->id);
111
112 if (*(u64 *)port->attached_sas_addr == 0) {
113 port->class = phy->class;
114 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
115 SAS_ADDR_SIZE);
116 port->iproto = phy->iproto;
117 port->tproto = phy->tproto;
118 port->oob_mode = phy->oob_mode;
119 port->linkrate = phy->linkrate;
120 } else
121 port->linkrate = max(port->linkrate, phy->linkrate);
122 spin_unlock(&port->phy_list_lock);
123 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
124
125 if (!port->port) {
126 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
127 BUG_ON(!port->port);
128 sas_port_add(port->port);
129 }
130 sas_port_add_phy(port->port, phy->phy);
131
132 SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
133 dev_name(&phy->phy->dev), dev_name(&port->port->dev),
134 port->phy_mask,
135 SAS_ADDR(port->attached_sas_addr));
136
137 if (port->port_dev)
138 port->port_dev->pathways = port->num_phys;
139
140 /* Tell the LLDD about this port formation. */
141 if (si->dft->lldd_port_formed)
142 si->dft->lldd_port_formed(phy);
143
144 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
145 }
146
147 /**
148 * sas_deform_port -- remove this phy from the port it belongs to
149 * @phy: the phy of interest
150 *
151 * This is called when the physical link to the other phy has been
152 * lost (on this phy), in Event thread context. We cannot delay here.
153 */
sas_deform_port(struct asd_sas_phy * phy,int gone)154 void sas_deform_port(struct asd_sas_phy *phy, int gone)
155 {
156 struct sas_ha_struct *sas_ha = phy->ha;
157 struct asd_sas_port *port = phy->port;
158 struct sas_internal *si =
159 to_sas_internal(sas_ha->core.shost->transportt);
160 struct domain_device *dev;
161 unsigned long flags;
162
163 if (!port)
164 return; /* done by a phy event */
165
166 dev = port->port_dev;
167 if (dev)
168 dev->pathways--;
169
170 if (port->num_phys == 1) {
171 sas_unregister_domain_devices(port, gone);
172 sas_port_delete(port->port);
173 port->port = NULL;
174 } else {
175 sas_port_delete_phy(port->port, phy->phy);
176 sas_device_set_phy(dev, port->port);
177 }
178
179 if (si->dft->lldd_port_deformed)
180 si->dft->lldd_port_deformed(phy);
181
182 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
183 spin_lock(&port->phy_list_lock);
184
185 list_del_init(&phy->port_phy_el);
186 sas_phy_set_target(phy, NULL);
187 phy->port = NULL;
188 port->num_phys--;
189 port->phy_mask &= ~(1U << phy->id);
190
191 if (port->num_phys == 0) {
192 INIT_LIST_HEAD(&port->phy_list);
193 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
194 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
195 port->class = 0;
196 port->iproto = 0;
197 port->tproto = 0;
198 port->oob_mode = 0;
199 port->phy_mask = 0;
200 }
201 spin_unlock(&port->phy_list_lock);
202 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
203
204 return;
205 }
206
207 /* ---------- SAS port events ---------- */
208
sas_porte_bytes_dmaed(struct work_struct * work)209 void sas_porte_bytes_dmaed(struct work_struct *work)
210 {
211 struct asd_sas_event *ev = to_asd_sas_event(work);
212 struct asd_sas_phy *phy = ev->phy;
213
214 clear_bit(PORTE_BYTES_DMAED, &phy->port_events_pending);
215
216 sas_form_port(phy);
217 }
218
sas_porte_broadcast_rcvd(struct work_struct * work)219 void sas_porte_broadcast_rcvd(struct work_struct *work)
220 {
221 struct asd_sas_event *ev = to_asd_sas_event(work);
222 struct asd_sas_phy *phy = ev->phy;
223 unsigned long flags;
224 u32 prim;
225
226 clear_bit(PORTE_BROADCAST_RCVD, &phy->port_events_pending);
227
228 spin_lock_irqsave(&phy->sas_prim_lock, flags);
229 prim = phy->sas_prim;
230 spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
231
232 SAS_DPRINTK("broadcast received: %d\n", prim);
233 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
234 }
235
sas_porte_link_reset_err(struct work_struct * work)236 void sas_porte_link_reset_err(struct work_struct *work)
237 {
238 struct asd_sas_event *ev = to_asd_sas_event(work);
239 struct asd_sas_phy *phy = ev->phy;
240
241 clear_bit(PORTE_LINK_RESET_ERR, &phy->port_events_pending);
242
243 sas_deform_port(phy, 1);
244 }
245
sas_porte_timer_event(struct work_struct * work)246 void sas_porte_timer_event(struct work_struct *work)
247 {
248 struct asd_sas_event *ev = to_asd_sas_event(work);
249 struct asd_sas_phy *phy = ev->phy;
250
251 clear_bit(PORTE_TIMER_EVENT, &phy->port_events_pending);
252
253 sas_deform_port(phy, 1);
254 }
255
sas_porte_hard_reset(struct work_struct * work)256 void sas_porte_hard_reset(struct work_struct *work)
257 {
258 struct asd_sas_event *ev = to_asd_sas_event(work);
259 struct asd_sas_phy *phy = ev->phy;
260
261 clear_bit(PORTE_HARD_RESET, &phy->port_events_pending);
262
263 sas_deform_port(phy, 1);
264 }
265
266 /* ---------- SAS port registration ---------- */
267
sas_init_port(struct asd_sas_port * port,struct sas_ha_struct * sas_ha,int i)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 INIT_LIST_HEAD(&port->disco_list);
275 INIT_LIST_HEAD(&port->destroy_list);
276 spin_lock_init(&port->phy_list_lock);
277 INIT_LIST_HEAD(&port->phy_list);
278 port->ha = sas_ha;
279
280 spin_lock_init(&port->dev_list_lock);
281 }
282
sas_register_ports(struct sas_ha_struct * sas_ha)283 int sas_register_ports(struct sas_ha_struct *sas_ha)
284 {
285 int i;
286
287 /* initialize the ports and discovery */
288 for (i = 0; i < sas_ha->num_phys; i++) {
289 struct asd_sas_port *port = sas_ha->sas_port[i];
290
291 sas_init_port(port, sas_ha, i);
292 sas_init_disc(&port->disc, port);
293 }
294 return 0;
295 }
296
sas_unregister_ports(struct sas_ha_struct * sas_ha)297 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
298 {
299 int i;
300
301 for (i = 0; i < sas_ha->num_phys; i++)
302 if (sas_ha->sas_phy[i]->port)
303 sas_deform_port(sas_ha->sas_phy[i], 0);
304
305 }
306