xref: /openbmc/linux/drivers/scsi/libsas/sas_port.c (revision 4800cd83)
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 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  */
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);
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  */
156 void sas_deform_port(struct asd_sas_phy *phy)
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 	unsigned long flags;
163 
164 	if (!port)
165 		return;		  /* done by a phy event */
166 
167 	if (port->port_dev)
168 		port->port_dev->pathways--;
169 
170 	if (port->num_phys == 1) {
171 		sas_unregister_domain_devices(port);
172 		sas_port_delete(port->port);
173 		port->port = NULL;
174 	} else
175 		sas_port_delete_phy(port->port, phy->phy);
176 
177 
178 	if (si->dft->lldd_port_deformed)
179 		si->dft->lldd_port_deformed(phy);
180 
181 	spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
182 	spin_lock(&port->phy_list_lock);
183 
184 	list_del_init(&phy->port_phy_el);
185 	phy->port = NULL;
186 	port->num_phys--;
187 	port->phy_mask &= ~(1U << phy->id);
188 
189 	if (port->num_phys == 0) {
190 		INIT_LIST_HEAD(&port->phy_list);
191 		memset(port->sas_addr, 0, SAS_ADDR_SIZE);
192 		memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
193 		port->class = 0;
194 		port->iproto = 0;
195 		port->tproto = 0;
196 		port->oob_mode = 0;
197 		port->phy_mask = 0;
198 	}
199 	spin_unlock(&port->phy_list_lock);
200 	spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
201 
202 	return;
203 }
204 
205 /* ---------- SAS port events ---------- */
206 
207 void sas_porte_bytes_dmaed(struct work_struct *work)
208 {
209 	struct asd_sas_event *ev =
210 		container_of(work, struct asd_sas_event, work);
211 	struct asd_sas_phy *phy = ev->phy;
212 
213 	sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
214 			&phy->port_events_pending);
215 
216 	sas_form_port(phy);
217 }
218 
219 void sas_porte_broadcast_rcvd(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 	unsigned long flags;
225 	u32 prim;
226 
227 	sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
228 			&phy->port_events_pending);
229 
230 	spin_lock_irqsave(&phy->sas_prim_lock, flags);
231 	prim = phy->sas_prim;
232 	spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
233 
234 	SAS_DPRINTK("broadcast received: %d\n", prim);
235 	sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
236 }
237 
238 void sas_porte_link_reset_err(struct work_struct *work)
239 {
240 	struct asd_sas_event *ev =
241 		container_of(work, struct asd_sas_event, work);
242 	struct asd_sas_phy *phy = ev->phy;
243 
244 	sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
245 			&phy->port_events_pending);
246 
247 	sas_deform_port(phy);
248 }
249 
250 void sas_porte_timer_event(struct work_struct *work)
251 {
252 	struct asd_sas_event *ev =
253 		container_of(work, struct asd_sas_event, work);
254 	struct asd_sas_phy *phy = ev->phy;
255 
256 	sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
257 			&phy->port_events_pending);
258 
259 	sas_deform_port(phy);
260 }
261 
262 void sas_porte_hard_reset(struct work_struct *work)
263 {
264 	struct asd_sas_event *ev =
265 		container_of(work, struct asd_sas_event, work);
266 	struct asd_sas_phy *phy = ev->phy;
267 
268 	sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
269 			&phy->port_events_pending);
270 
271 	sas_deform_port(phy);
272 }
273 
274 /* ---------- SAS port registration ---------- */
275 
276 static void sas_init_port(struct asd_sas_port *port,
277 			  struct sas_ha_struct *sas_ha, int i)
278 {
279 	memset(port, 0, sizeof(*port));
280 	port->id = i;
281 	INIT_LIST_HEAD(&port->dev_list);
282 	spin_lock_init(&port->phy_list_lock);
283 	INIT_LIST_HEAD(&port->phy_list);
284 	port->ha = sas_ha;
285 
286 	spin_lock_init(&port->dev_list_lock);
287 }
288 
289 int sas_register_ports(struct sas_ha_struct *sas_ha)
290 {
291 	int i;
292 
293 	/* initialize the ports and discovery */
294 	for (i = 0; i < sas_ha->num_phys; i++) {
295 		struct asd_sas_port *port = sas_ha->sas_port[i];
296 
297 		sas_init_port(port, sas_ha, i);
298 		sas_init_disc(&port->disc, port);
299 	}
300 	return 0;
301 }
302 
303 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
304 {
305 	int i;
306 
307 	for (i = 0; i < sas_ha->num_phys; i++)
308 		if (sas_ha->sas_phy[i]->port)
309 			sas_deform_port(sas_ha->sas_phy[i]);
310 
311 }
312