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, *n;
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->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_safe(dev, n, &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
sas_form_port_add_phy(struct asd_sas_port * port,struct asd_sas_phy * phy,bool wideport)70 static void sas_form_port_add_phy(struct asd_sas_port *port,
71 struct asd_sas_phy *phy, bool wideport)
72 {
73 list_add_tail(&phy->port_phy_el, &port->phy_list);
74 sas_phy_set_target(phy, port->port_dev);
75 phy->port = port;
76 port->num_phys++;
77 port->phy_mask |= (1U << phy->id);
78
79 if (wideport)
80 pr_debug("phy%d matched wide port%d\n", phy->id,
81 port->id);
82 else
83 memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE);
84
85 if (*(u64 *)port->attached_sas_addr == 0) {
86 memcpy(port->attached_sas_addr, phy->attached_sas_addr,
87 SAS_ADDR_SIZE);
88 port->iproto = phy->iproto;
89 port->tproto = phy->tproto;
90 port->oob_mode = phy->oob_mode;
91 port->linkrate = phy->linkrate;
92 } else {
93 port->linkrate = max(port->linkrate, phy->linkrate);
94 }
95 }
96
97 /**
98 * sas_form_port - add this phy to a port
99 * @phy: the phy of interest
100 *
101 * This function adds this phy to an existing port, thus creating a wide
102 * port, or it creates a port and adds the phy to the port.
103 */
sas_form_port(struct asd_sas_phy * phy)104 static void sas_form_port(struct asd_sas_phy *phy)
105 {
106 int i;
107 struct sas_ha_struct *sas_ha = phy->ha;
108 struct asd_sas_port *port = phy->port;
109 struct domain_device *port_dev = NULL;
110 struct sas_internal *si =
111 to_sas_internal(sas_ha->shost->transportt);
112 unsigned long flags;
113
114 if (port) {
115 if (!phy_is_wideport_member(port, phy))
116 sas_deform_port(phy, 0);
117 else if (phy->suspended) {
118 phy->suspended = 0;
119 sas_resume_port(phy);
120
121 /* phy came back, try to cancel the timeout */
122 wake_up(&sas_ha->eh_wait_q);
123 return;
124 } else {
125 pr_info("%s: phy%d belongs to port%d already(%d)!\n",
126 __func__, phy->id, phy->port->id,
127 phy->port->num_phys);
128 return;
129 }
130 }
131
132 /* see if the phy should be part of a wide port */
133 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
134 for (i = 0; i < sas_ha->num_phys; i++) {
135 port = sas_ha->sas_port[i];
136 spin_lock(&port->phy_list_lock);
137 if (*(u64 *) port->sas_addr &&
138 phy_is_wideport_member(port, phy) && port->num_phys > 0) {
139 /* wide port */
140 port_dev = port->port_dev;
141 sas_form_port_add_phy(port, phy, true);
142 spin_unlock(&port->phy_list_lock);
143 break;
144 }
145 spin_unlock(&port->phy_list_lock);
146 }
147 /* The phy does not match any existing port, create a new one */
148 if (i == sas_ha->num_phys) {
149 for (i = 0; i < sas_ha->num_phys; i++) {
150 port = sas_ha->sas_port[i];
151 spin_lock(&port->phy_list_lock);
152 if (*(u64 *)port->sas_addr == 0
153 && port->num_phys == 0) {
154 port_dev = port->port_dev;
155 sas_form_port_add_phy(port, phy, false);
156 spin_unlock(&port->phy_list_lock);
157 break;
158 }
159 spin_unlock(&port->phy_list_lock);
160 }
161
162 if (i >= sas_ha->num_phys) {
163 pr_err("%s: couldn't find a free port, bug?\n",
164 __func__);
165 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
166 return;
167 }
168 }
169 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
170
171 if (!port->port) {
172 port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
173 BUG_ON(!port->port);
174 sas_port_add(port->port);
175 }
176 sas_port_add_phy(port->port, phy->phy);
177
178 pr_debug("%s added to %s, phy_mask:0x%x (%016llx)\n",
179 dev_name(&phy->phy->dev), dev_name(&port->port->dev),
180 port->phy_mask,
181 SAS_ADDR(port->attached_sas_addr));
182
183 if (port_dev)
184 port_dev->pathways = port->num_phys;
185
186 /* Tell the LLDD about this port formation. */
187 if (si->dft->lldd_port_formed)
188 si->dft->lldd_port_formed(phy);
189
190 sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
191 /* Only insert a revalidate event after initial discovery */
192 if (port_dev && dev_is_expander(port_dev->dev_type)) {
193 struct expander_device *ex_dev = &port_dev->ex_dev;
194
195 ex_dev->ex_change_count = -1;
196 sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
197 }
198 flush_workqueue(sas_ha->disco_q);
199 }
200
201 /**
202 * sas_deform_port - remove this phy from the port it belongs to
203 * @phy: the phy of interest
204 * @gone: whether or not the PHY is gone
205 *
206 * This is called when the physical link to the other phy has been
207 * lost (on this phy), in Event thread context. We cannot delay here.
208 */
sas_deform_port(struct asd_sas_phy * phy,int gone)209 void sas_deform_port(struct asd_sas_phy *phy, int gone)
210 {
211 struct sas_ha_struct *sas_ha = phy->ha;
212 struct asd_sas_port *port = phy->port;
213 struct sas_internal *si =
214 to_sas_internal(sas_ha->shost->transportt);
215 struct domain_device *dev;
216 unsigned long flags;
217
218 if (!port)
219 return; /* done by a phy event */
220
221 dev = port->port_dev;
222 if (dev)
223 dev->pathways--;
224
225 if (port->num_phys == 1) {
226 sas_unregister_domain_devices(port, gone);
227 sas_destruct_devices(port);
228 sas_port_delete(port->port);
229 port->port = NULL;
230 } else {
231 sas_port_delete_phy(port->port, phy->phy);
232 sas_device_set_phy(dev, port->port);
233 }
234
235 if (si->dft->lldd_port_deformed)
236 si->dft->lldd_port_deformed(phy);
237
238 spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
239 spin_lock(&port->phy_list_lock);
240
241 list_del_init(&phy->port_phy_el);
242 sas_phy_set_target(phy, NULL);
243 phy->port = NULL;
244 port->num_phys--;
245 port->phy_mask &= ~(1U << phy->id);
246
247 if (port->num_phys == 0) {
248 INIT_LIST_HEAD(&port->phy_list);
249 memset(port->sas_addr, 0, SAS_ADDR_SIZE);
250 memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
251 port->iproto = 0;
252 port->tproto = 0;
253 port->oob_mode = 0;
254 port->phy_mask = 0;
255 }
256 spin_unlock(&port->phy_list_lock);
257 spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
258
259 /* Only insert revalidate event if the port still has members */
260 if (port->port && dev && dev_is_expander(dev->dev_type)) {
261 struct expander_device *ex_dev = &dev->ex_dev;
262
263 ex_dev->ex_change_count = -1;
264 sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
265 }
266 flush_workqueue(sas_ha->disco_q);
267
268 return;
269 }
270
271 /* ---------- SAS port events ---------- */
272
sas_porte_bytes_dmaed(struct work_struct * work)273 void sas_porte_bytes_dmaed(struct work_struct *work)
274 {
275 struct asd_sas_event *ev = to_asd_sas_event(work);
276 struct asd_sas_phy *phy = ev->phy;
277
278 sas_form_port(phy);
279 }
280
sas_porte_broadcast_rcvd(struct work_struct * work)281 void sas_porte_broadcast_rcvd(struct work_struct *work)
282 {
283 struct asd_sas_event *ev = to_asd_sas_event(work);
284 struct asd_sas_phy *phy = ev->phy;
285 unsigned long flags;
286 u32 prim;
287
288 spin_lock_irqsave(&phy->sas_prim_lock, flags);
289 prim = phy->sas_prim;
290 spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
291
292 pr_debug("broadcast received: %d\n", prim);
293 sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
294
295 if (phy->port)
296 flush_workqueue(phy->port->ha->disco_q);
297 }
298
sas_porte_link_reset_err(struct work_struct * work)299 void sas_porte_link_reset_err(struct work_struct *work)
300 {
301 struct asd_sas_event *ev = to_asd_sas_event(work);
302 struct asd_sas_phy *phy = ev->phy;
303
304 sas_deform_port(phy, 1);
305 }
306
sas_porte_timer_event(struct work_struct * work)307 void sas_porte_timer_event(struct work_struct *work)
308 {
309 struct asd_sas_event *ev = to_asd_sas_event(work);
310 struct asd_sas_phy *phy = ev->phy;
311
312 sas_deform_port(phy, 1);
313 }
314
sas_porte_hard_reset(struct work_struct * work)315 void sas_porte_hard_reset(struct work_struct *work)
316 {
317 struct asd_sas_event *ev = to_asd_sas_event(work);
318 struct asd_sas_phy *phy = ev->phy;
319
320 sas_deform_port(phy, 1);
321 }
322
323 /* ---------- SAS port registration ---------- */
324
sas_init_port(struct asd_sas_port * port,struct sas_ha_struct * sas_ha,int i)325 static void sas_init_port(struct asd_sas_port *port,
326 struct sas_ha_struct *sas_ha, int i)
327 {
328 memset(port, 0, sizeof(*port));
329 port->id = i;
330 INIT_LIST_HEAD(&port->dev_list);
331 INIT_LIST_HEAD(&port->disco_list);
332 INIT_LIST_HEAD(&port->destroy_list);
333 INIT_LIST_HEAD(&port->sas_port_del_list);
334 spin_lock_init(&port->phy_list_lock);
335 INIT_LIST_HEAD(&port->phy_list);
336 port->ha = sas_ha;
337
338 spin_lock_init(&port->dev_list_lock);
339 }
340
sas_register_ports(struct sas_ha_struct * sas_ha)341 int sas_register_ports(struct sas_ha_struct *sas_ha)
342 {
343 int i;
344
345 /* initialize the ports and discovery */
346 for (i = 0; i < sas_ha->num_phys; i++) {
347 struct asd_sas_port *port = sas_ha->sas_port[i];
348
349 sas_init_port(port, sas_ha, i);
350 sas_init_disc(&port->disc, port);
351 }
352 return 0;
353 }
354
sas_unregister_ports(struct sas_ha_struct * sas_ha)355 void sas_unregister_ports(struct sas_ha_struct *sas_ha)
356 {
357 int i;
358
359 for (i = 0; i < sas_ha->num_phys; i++)
360 if (sas_ha->sas_phy[i]->port)
361 sas_deform_port(sas_ha->sas_phy[i], 0);
362
363 }
364
365 const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
366 [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
367 [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
368 [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
369 [PORTE_TIMER_EVENT] = sas_porte_timer_event,
370 [PORTE_HARD_RESET] = sas_porte_hard_reset,
371 };
372
