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2908d778 JB |
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 | ||
46 | if (port) { | |
47 | if (memcmp(port->attached_sas_addr, phy->attached_sas_addr, | |
48 | SAS_ADDR_SIZE) == 0) | |
49 | sas_deform_port(phy); | |
50 | else { | |
51 | SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n", | |
52 | __FUNCTION__, phy->id, phy->port->id, | |
53 | phy->port->num_phys); | |
54 | return; | |
55 | } | |
56 | } | |
57 | ||
58 | /* find a port */ | |
59 | spin_lock(&sas_ha->phy_port_lock); | |
60 | for (i = 0; i < sas_ha->num_phys; i++) { | |
61 | port = sas_ha->sas_port[i]; | |
62 | spin_lock(&port->phy_list_lock); | |
63 | if (*(u64 *) port->sas_addr && | |
64 | memcmp(port->attached_sas_addr, | |
65 | phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 && | |
66 | port->num_phys > 0) { | |
67 | /* wide port */ | |
68 | SAS_DPRINTK("phy%d matched wide port%d\n", phy->id, | |
69 | port->id); | |
70 | break; | |
71 | } else if (*(u64 *) port->sas_addr == 0 && port->num_phys==0) { | |
72 | memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE); | |
73 | break; | |
74 | } | |
75 | spin_unlock(&port->phy_list_lock); | |
76 | } | |
77 | ||
78 | if (i >= sas_ha->num_phys) { | |
79 | printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n", | |
80 | __FUNCTION__); | |
81 | spin_unlock(&sas_ha->phy_port_lock); | |
82 | return; | |
83 | } | |
84 | ||
85 | /* add the phy to the port */ | |
86 | list_add_tail(&phy->port_phy_el, &port->phy_list); | |
87 | phy->port = port; | |
88 | port->num_phys++; | |
89 | port->phy_mask |= (1U << phy->id); | |
90 | ||
91 | if (!port->phy) | |
92 | port->phy = phy->phy; | |
93 | ||
94 | SAS_DPRINTK("phy%d added to port%d, phy_mask:0x%x\n", phy->id, | |
95 | port->id, port->phy_mask); | |
96 | ||
97 | if (*(u64 *)port->attached_sas_addr == 0) { | |
98 | port->class = phy->class; | |
99 | memcpy(port->attached_sas_addr, phy->attached_sas_addr, | |
100 | SAS_ADDR_SIZE); | |
101 | port->iproto = phy->iproto; | |
102 | port->tproto = phy->tproto; | |
103 | port->oob_mode = phy->oob_mode; | |
104 | port->linkrate = phy->linkrate; | |
105 | } else | |
106 | port->linkrate = max(port->linkrate, phy->linkrate); | |
107 | spin_unlock(&port->phy_list_lock); | |
108 | spin_unlock(&sas_ha->phy_port_lock); | |
109 | ||
110 | if (!port->port) { | |
111 | port->port = sas_port_alloc(phy->phy->dev.parent, port->id); | |
112 | BUG_ON(!port->port); | |
113 | sas_port_add(port->port); | |
114 | } | |
115 | sas_port_add_phy(port->port, phy->phy); | |
116 | ||
117 | if (port->port_dev) | |
118 | port->port_dev->pathways = port->num_phys; | |
119 | ||
120 | /* Tell the LLDD about this port formation. */ | |
121 | if (si->dft->lldd_port_formed) | |
122 | si->dft->lldd_port_formed(phy); | |
123 | ||
124 | sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN); | |
125 | } | |
126 | ||
127 | /** | |
128 | * sas_deform_port -- remove this phy from the port it belongs to | |
129 | * @phy: the phy of interest | |
130 | * | |
131 | * This is called when the physical link to the other phy has been | |
132 | * lost (on this phy), in Event thread context. We cannot delay here. | |
133 | */ | |
134 | void sas_deform_port(struct asd_sas_phy *phy) | |
135 | { | |
136 | struct sas_ha_struct *sas_ha = phy->ha; | |
137 | struct asd_sas_port *port = phy->port; | |
138 | struct sas_internal *si = | |
139 | to_sas_internal(sas_ha->core.shost->transportt); | |
140 | ||
141 | if (!port) | |
142 | return; /* done by a phy event */ | |
143 | ||
144 | if (port->port_dev) | |
145 | port->port_dev->pathways--; | |
146 | ||
147 | if (port->num_phys == 1) { | |
148 | sas_unregister_domain_devices(port); | |
149 | sas_port_delete(port->port); | |
150 | port->port = NULL; | |
151 | } else | |
152 | sas_port_delete_phy(port->port, phy->phy); | |
153 | ||
154 | ||
155 | if (si->dft->lldd_port_deformed) | |
156 | si->dft->lldd_port_deformed(phy); | |
157 | ||
158 | spin_lock(&sas_ha->phy_port_lock); | |
159 | spin_lock(&port->phy_list_lock); | |
160 | ||
161 | list_del_init(&phy->port_phy_el); | |
162 | phy->port = NULL; | |
163 | port->num_phys--; | |
164 | port->phy_mask &= ~(1U << phy->id); | |
165 | ||
166 | if (port->num_phys == 0) { | |
167 | INIT_LIST_HEAD(&port->phy_list); | |
168 | memset(port->sas_addr, 0, SAS_ADDR_SIZE); | |
169 | memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); | |
170 | port->class = 0; | |
171 | port->iproto = 0; | |
172 | port->tproto = 0; | |
173 | port->oob_mode = 0; | |
174 | port->phy_mask = 0; | |
175 | } | |
176 | spin_unlock(&port->phy_list_lock); | |
177 | spin_unlock(&sas_ha->phy_port_lock); | |
178 | ||
179 | return; | |
180 | } | |
181 | ||
182 | /* ---------- SAS port events ---------- */ | |
183 | ||
184 | void sas_porte_bytes_dmaed(void *data) | |
185 | { | |
186 | struct asd_sas_phy *phy = data; | |
187 | ||
188 | sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock, | |
189 | &phy->port_events_pending); | |
190 | ||
191 | sas_form_port(phy); | |
192 | } | |
193 | ||
194 | void sas_porte_broadcast_rcvd(void *data) | |
195 | { | |
196 | unsigned long flags; | |
197 | u32 prim; | |
198 | struct asd_sas_phy *phy = data; | |
199 | ||
200 | sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock, | |
201 | &phy->port_events_pending); | |
202 | ||
203 | spin_lock_irqsave(&phy->sas_prim_lock, flags); | |
204 | prim = phy->sas_prim; | |
205 | spin_unlock_irqrestore(&phy->sas_prim_lock, flags); | |
206 | ||
207 | SAS_DPRINTK("broadcast received: %d\n", prim); | |
208 | sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); | |
209 | } | |
210 | ||
211 | void sas_porte_link_reset_err(void *data) | |
212 | { | |
213 | struct asd_sas_phy *phy = data; | |
214 | ||
215 | sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock, | |
216 | &phy->port_events_pending); | |
217 | ||
218 | sas_deform_port(phy); | |
219 | } | |
220 | ||
221 | void sas_porte_timer_event(void *data) | |
222 | { | |
223 | struct asd_sas_phy *phy = data; | |
224 | ||
225 | sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock, | |
226 | &phy->port_events_pending); | |
227 | ||
228 | sas_deform_port(phy); | |
229 | } | |
230 | ||
231 | void sas_porte_hard_reset(void *data) | |
232 | { | |
233 | struct asd_sas_phy *phy = data; | |
234 | ||
235 | sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock, | |
236 | &phy->port_events_pending); | |
237 | ||
238 | sas_deform_port(phy); | |
239 | } | |
240 | ||
241 | /* ---------- SAS port registration ---------- */ | |
242 | ||
243 | static void sas_init_port(struct asd_sas_port *port, | |
244 | struct sas_ha_struct *sas_ha, int i) | |
245 | { | |
246 | port->id = i; | |
247 | INIT_LIST_HEAD(&port->dev_list); | |
248 | spin_lock_init(&port->phy_list_lock); | |
249 | INIT_LIST_HEAD(&port->phy_list); | |
250 | port->num_phys = 0; | |
251 | port->phy_mask = 0; | |
252 | port->ha = sas_ha; | |
253 | ||
254 | spin_lock_init(&port->dev_list_lock); | |
255 | } | |
256 | ||
257 | int sas_register_ports(struct sas_ha_struct *sas_ha) | |
258 | { | |
259 | int i; | |
260 | ||
261 | /* initialize the ports and discovery */ | |
262 | for (i = 0; i < sas_ha->num_phys; i++) { | |
263 | struct asd_sas_port *port = sas_ha->sas_port[i]; | |
264 | ||
265 | sas_init_port(port, sas_ha, i); | |
266 | sas_init_disc(&port->disc, port); | |
267 | } | |
268 | return 0; | |
269 | } | |
270 | ||
271 | void sas_unregister_ports(struct sas_ha_struct *sas_ha) | |
272 | { | |
273 | int i; | |
274 | ||
275 | for (i = 0; i < sas_ha->num_phys; i++) | |
276 | if (sas_ha->sas_phy[i]->port) | |
277 | sas_deform_port(sas_ha->sas_phy[i]); | |
278 | ||
279 | } |