xref: /linux/drivers/scsi/libsas/sas_port.c (revision a1c613ae4c322ddd58d5a8539dbfba2a0380a8c0)
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