1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Serial Attached SCSI (SAS) Port class
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9 #include "sas_internal.h"
10
11 #include <scsi/scsi_transport.h>
12 #include <scsi/scsi_transport_sas.h>
13 #include "../scsi_sas_internal.h"
14
phy_is_wideport_member(struct asd_sas_port * port,struct asd_sas_phy * phy)15 static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
16 {
17 struct sas_ha_struct *sas_ha = phy->ha;
18
19 if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
20 SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
21 memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
22 return false;
23 return true;
24 }
25
sas_resume_port(struct asd_sas_phy * phy)26 static void sas_resume_port(struct asd_sas_phy *phy)
27 {
28 struct domain_device *dev;
29 struct asd_sas_port *port = phy->port;
30 struct sas_ha_struct *sas_ha = phy->ha;
31 struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt);
32
33 if (si->dft->lldd_port_formed)
34 si->dft->lldd_port_formed(phy);
35
36 if (port->suspended)
37 port->suspended = 0;
38 else {
39 /* we only need to handle "link returned" actions once */
40 return;
41 }
42
43 /* if the port came back:
44 * 1/ presume every device came back
45 * 2/ force the next revalidation to check all expander phys
46 */
47 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
48 int i, rc;
49
50 rc = sas_notify_lldd_dev_found(dev);
51 if (rc) {
52 sas_unregister_dev(port, dev);
53 sas_destruct_devices(port);
54 continue;
55 }
56
57 if (dev_is_expander(dev->dev_type)) {
58 dev->ex_dev.ex_change_count = -1;
59 for (i = 0; i < dev->ex_dev.num_phys; i++) {
60 struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
61
62 phy->phy_change_count = -1;
63 }
64 }
65 }
66
67 sas_discover_event(port, DISCE_RESUME);
68 }
69
70 /**
71 * sas_form_port - add this phy to a port
72 * @phy: the phy of interest
73 *
74 * This function adds this phy to an existing port, thus creating a wide
75 * port, or it creates a port and adds the phy to the port.
76 */
sas_form_port(struct asd_sas_phy * phy)77 static void sas_form_port(struct asd_sas_phy *phy)
78 {
79 int i;
80 struct sas_ha_struct *sas_ha = phy->ha;
81 struct asd_sas_port *port = phy->port;
82 struct domain_device *port_dev;
83 struct sas_internal *si =
84 to_sas_internal(sas_ha->core.shost->transportt);
85 unsigned long flags;
86
87 if (port) {
88 if (!phy_is_wideport_member(port, phy))
89 sas_deform_port(phy, 0);
90 else if (phy->suspended) {
91 phy->suspended = 0;
92 sas_resume_port(phy);
93
94 /* phy came back, try to cancel the timeout */
95 wake_up(&sas_ha->eh_wait_q);
96 return;
97 } else {
98 pr_info("%s: phy%d belongs to port%d already(%d)!\n",
99 __func__, phy->id, phy->port->id,
100 phy->port->num_phys);
101 return;
102 }
103 }
104
105 /* see if the phy should be part of a wide port */
106 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
107 for (i = 0; i < sas_ha->num_phys; i++) {
108 port = sas_ha->sas_port[i];
109 spin_lock(&port->phy_list_lock);
110 if (*(u64 *) port->sas_addr &&
111 phy_is_wideport_member(port, phy) && port->num_phys > 0) {
112 /* wide port */
113 pr_debug("phy%d matched wide port%d\n", phy->id,
114 port->id);
115 break;
116 }
117 spin_unlock(&port->phy_list_lock);
118 }
119 /* The phy does not match any existing port, create a new one */
120 if (i == sas_ha->num_phys) {
121 for (i = 0; i < sas_ha->num_phys; i++) {
122 port = sas_ha->sas_port[i];
123 spin_lock(&port->phy_list_lock);
124 if (*(u64 *)port->sas_addr == 0
125 && port->num_phys == 0) {
126 memcpy(port->sas_addr, phy->sas_addr,
127 SAS_ADDR_SIZE);
128 break;
129 }
130 spin_unlock(&port->phy_list_lock);
131 }
132 }
133
134 if (i >= sas_ha->num_phys) {
135 pr_err("%s: couldn't find a free port, bug?\n", __func__);
136 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
137 return;
138 }
139
140 /* add the phy to the port */
141 port_dev = port->port_dev;
142 list_add_tail(&phy->port_phy_el, &port->phy_list);
143 sas_phy_set_target(phy, port_dev);
144 phy->port = port;
145 port->num_phys++;
146 port->phy_mask |= (1U << phy->id);
147
148 if (*(u64 *)port->attached_sas_addr == 0) {
149 port->class = phy->class;
150 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
151 SAS_ADDR_SIZE);
152 port->iproto = phy->iproto;
153 port->tproto = phy->tproto;
154 port->oob_mode = phy->oob_mode;
155 port->linkrate = phy->linkrate;
156 } else
157 port->linkrate = max(port->linkrate, phy->linkrate);
158 spin_unlock(&port->phy_list_lock);
159 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
160
161 if (!port->port) {
162 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
163 BUG_ON(!port->port);
164 sas_port_add(port->port);
165 }
166 sas_port_add_phy(port->port, phy->phy);
167
168 pr_debug("%s added to %s, phy_mask:0x%x (%016llx)\n",
169 dev_name(&phy->phy->dev), dev_name(&port->port->dev),
170 port->phy_mask,
171 SAS_ADDR(port->attached_sas_addr));
172
173 if (port_dev)
174 port_dev->pathways = port->num_phys;
175
176 /* Tell the LLDD about this port formation. */
177 if (si->dft->lldd_port_formed)
178 si->dft->lldd_port_formed(phy);
179
180 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
181 /* Only insert a revalidate event after initial discovery */
182 if (port_dev && dev_is_expander(port_dev->dev_type)) {
183 struct expander_device *ex_dev = &port_dev->ex_dev;
184
185 ex_dev->ex_change_count = -1;
186 sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
187 }
188 flush_workqueue(sas_ha->disco_q);
189 }
190
191 /**
192 * sas_deform_port - remove this phy from the port it belongs to
193 * @phy: the phy of interest
194 * @gone: whether or not the PHY is gone
195 *
196 * This is called when the physical link to the other phy has been
197 * lost (on this phy), in Event thread context. We cannot delay here.
198 */
sas_deform_port(struct asd_sas_phy * phy,int gone)199 void sas_deform_port(struct asd_sas_phy *phy, int gone)
200 {
201 struct sas_ha_struct *sas_ha = phy->ha;
202 struct asd_sas_port *port = phy->port;
203 struct sas_internal *si =
204 to_sas_internal(sas_ha->core.shost->transportt);
205 struct domain_device *dev;
206 unsigned long flags;
207
208 if (!port)
209 return; /* done by a phy event */
210
211 dev = port->port_dev;
212 if (dev)
213 dev->pathways--;
214
215 if (port->num_phys == 1) {
216 sas_unregister_domain_devices(port, gone);
217 sas_destruct_devices(port);
218 sas_port_delete(port->port);
219 port->port = NULL;
220 } else {
221 sas_port_delete_phy(port->port, phy->phy);
222 sas_device_set_phy(dev, port->port);
223 }
224
225 if (si->dft->lldd_port_deformed)
226 si->dft->lldd_port_deformed(phy);
227
228 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
229 spin_lock(&port->phy_list_lock);
230
231 list_del_init(&phy->port_phy_el);
232 sas_phy_set_target(phy, NULL);
233 phy->port = NULL;
234 port->num_phys--;
235 port->phy_mask &= ~(1U << phy->id);
236
237 if (port->num_phys == 0) {
238 INIT_LIST_HEAD(&port->phy_list);
239 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
240 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
241 port->class = 0;
242 port->iproto = 0;
243 port->tproto = 0;
244 port->oob_mode = 0;
245 port->phy_mask = 0;
246 }
247 spin_unlock(&port->phy_list_lock);
248 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
249
250 /* Only insert revalidate event if the port still has members */
251 if (port->port && dev && dev_is_expander(dev->dev_type)) {
252 struct expander_device *ex_dev = &dev->ex_dev;
253
254 ex_dev->ex_change_count = -1;
255 sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
256 }
257 flush_workqueue(sas_ha->disco_q);
258
259 return;
260 }
261
262 /* ---------- SAS port events ---------- */
263
sas_porte_bytes_dmaed(struct work_struct * work)264 void sas_porte_bytes_dmaed(struct work_struct *work)
265 {
266 struct asd_sas_event *ev = to_asd_sas_event(work);
267 struct asd_sas_phy *phy = ev->phy;
268
269 sas_form_port(phy);
270 }
271
sas_porte_broadcast_rcvd(struct work_struct * work)272 void sas_porte_broadcast_rcvd(struct work_struct *work)
273 {
274 struct asd_sas_event *ev = to_asd_sas_event(work);
275 struct asd_sas_phy *phy = ev->phy;
276 unsigned long flags;
277 u32 prim;
278
279 spin_lock_irqsave(&phy->sas_prim_lock, flags);
280 prim = phy->sas_prim;
281 spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
282
283 pr_debug("broadcast received: %d\n", prim);
284 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
285
286 if (phy->port)
287 flush_workqueue(phy->port->ha->disco_q);
288 }
289
sas_porte_link_reset_err(struct work_struct * work)290 void sas_porte_link_reset_err(struct work_struct *work)
291 {
292 struct asd_sas_event *ev = to_asd_sas_event(work);
293 struct asd_sas_phy *phy = ev->phy;
294
295 sas_deform_port(phy, 1);
296 }
297
sas_porte_timer_event(struct work_struct * work)298 void sas_porte_timer_event(struct work_struct *work)
299 {
300 struct asd_sas_event *ev = to_asd_sas_event(work);
301 struct asd_sas_phy *phy = ev->phy;
302
303 sas_deform_port(phy, 1);
304 }
305
sas_porte_hard_reset(struct work_struct * work)306 void sas_porte_hard_reset(struct work_struct *work)
307 {
308 struct asd_sas_event *ev = to_asd_sas_event(work);
309 struct asd_sas_phy *phy = ev->phy;
310
311 sas_deform_port(phy, 1);
312 }
313
314 /* ---------- SAS port registration ---------- */
315
sas_init_port(struct asd_sas_port * port,struct sas_ha_struct * sas_ha,int i)316 static void sas_init_port(struct asd_sas_port *port,
317 struct sas_ha_struct *sas_ha, int i)
318 {
319 memset(port, 0, sizeof(*port));
320 port->id = i;
321 INIT_LIST_HEAD(&port->dev_list);
322 INIT_LIST_HEAD(&port->disco_list);
323 INIT_LIST_HEAD(&port->destroy_list);
324 INIT_LIST_HEAD(&port->sas_port_del_list);
325 spin_lock_init(&port->phy_list_lock);
326 INIT_LIST_HEAD(&port->phy_list);
327 port->ha = sas_ha;
328
329 spin_lock_init(&port->dev_list_lock);
330 }
331
sas_register_ports(struct sas_ha_struct * sas_ha)332 int sas_register_ports(struct sas_ha_struct *sas_ha)
333 {
334 int i;
335
336 /* initialize the ports and discovery */
337 for (i = 0; i < sas_ha->num_phys; i++) {
338 struct asd_sas_port *port = sas_ha->sas_port[i];
339
340 sas_init_port(port, sas_ha, i);
341 sas_init_disc(&port->disc, port);
342 }
343 return 0;
344 }
345
sas_unregister_ports(struct sas_ha_struct * sas_ha)346 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
347 {
348 int i;
349
350 for (i = 0; i < sas_ha->num_phys; i++)
351 if (sas_ha->sas_phy[i]->port)
352 sas_deform_port(sas_ha->sas_phy[i], 0);
353
354 }
355
356 const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
357 [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
358 [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
359 [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
360 [PORTE_TIMER_EVENT] = sas_porte_timer_event,
361 [PORTE_HARD_RESET] = sas_porte_hard_reset,
362 };
363
