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1/*
2 * Serial Attached SCSI (SAS) Discover process
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 <linux/scatterlist.h>
26#include <linux/slab.h>
27#include <scsi/scsi_host.h>
28#include <scsi/scsi_eh.h>
29#include "sas_internal.h"
30
31#include <scsi/scsi_transport.h>
32#include <scsi/scsi_transport_sas.h>
33#include "../scsi_sas_internal.h"
34
35/* ---------- Basic task processing for discovery purposes ---------- */
36
37void sas_init_dev(struct domain_device *dev)
38{
39 INIT_LIST_HEAD(&dev->siblings);
40 INIT_LIST_HEAD(&dev->dev_list_node);
41 switch (dev->dev_type) {
42 case SAS_END_DEV:
43 break;
44 case EDGE_DEV:
45 case FANOUT_DEV:
46 INIT_LIST_HEAD(&dev->ex_dev.children);
47 break;
48 case SATA_DEV:
49 case SATA_PM:
50 case SATA_PM_PORT:
51 INIT_LIST_HEAD(&dev->sata_dev.children);
52 break;
53 default:
54 break;
55 }
56}
57
58/* ---------- Domain device discovery ---------- */
59
60/**
61 * sas_get_port_device -- Discover devices which caused port creation
62 * @port: pointer to struct sas_port of interest
63 *
64 * Devices directly attached to a HA port, have no parent. This is
65 * how we know they are (domain) "root" devices. All other devices
66 * do, and should have their "parent" pointer set appropriately as
67 * soon as a child device is discovered.
68 */
69static int sas_get_port_device(struct asd_sas_port *port)
70{
71 unsigned long flags;
72 struct asd_sas_phy *phy;
73 struct sas_rphy *rphy;
74 struct domain_device *dev;
75
76 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
77 if (!dev)
78 return -ENOMEM;
79
80 spin_lock_irqsave(&port->phy_list_lock, flags);
81 if (list_empty(&port->phy_list)) {
82 spin_unlock_irqrestore(&port->phy_list_lock, flags);
83 kfree(dev);
84 return -ENODEV;
85 }
86 phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
87 spin_lock(&phy->frame_rcvd_lock);
88 memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
89 (size_t)phy->frame_rcvd_size));
90 spin_unlock(&phy->frame_rcvd_lock);
91 spin_unlock_irqrestore(&port->phy_list_lock, flags);
92
93 if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
94 struct dev_to_host_fis *fis =
95 (struct dev_to_host_fis *) dev->frame_rcvd;
96 if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
97 fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
98 && (fis->device & ~0x10) == 0)
99 dev->dev_type = SATA_PM;
100 else
101 dev->dev_type = SATA_DEV;
102 dev->tproto = SAS_PROTOCOL_SATA;
103 } else {
104 struct sas_identify_frame *id =
105 (struct sas_identify_frame *) dev->frame_rcvd;
106 dev->dev_type = id->dev_type;
107 dev->iproto = id->initiator_bits;
108 dev->tproto = id->target_bits;
109 }
110
111 sas_init_dev(dev);
112
113 switch (dev->dev_type) {
114 case SAS_END_DEV:
115 case SATA_DEV:
116 rphy = sas_end_device_alloc(port->port);
117 break;
118 case EDGE_DEV:
119 rphy = sas_expander_alloc(port->port,
120 SAS_EDGE_EXPANDER_DEVICE);
121 break;
122 case FANOUT_DEV:
123 rphy = sas_expander_alloc(port->port,
124 SAS_FANOUT_EXPANDER_DEVICE);
125 break;
126 default:
127 printk("ERROR: Unidentified device type %d\n", dev->dev_type);
128 rphy = NULL;
129 break;
130 }
131
132 if (!rphy) {
133 kfree(dev);
134 return -ENODEV;
135 }
136 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
137 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
138 sas_fill_in_rphy(dev, rphy);
139 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
140 port->port_dev = dev;
141 dev->port = port;
142 dev->linkrate = port->linkrate;
143 dev->min_linkrate = port->linkrate;
144 dev->max_linkrate = port->linkrate;
145 dev->pathways = port->num_phys;
146 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
147 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
148 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
149 port->disc.max_level = 0;
150
151 dev->rphy = rphy;
152 spin_lock_irq(&port->dev_list_lock);
153 list_add_tail(&dev->dev_list_node, &port->dev_list);
154 spin_unlock_irq(&port->dev_list_lock);
155
156 return 0;
157}
158
159/* ---------- Discover and Revalidate ---------- */
160
161int sas_notify_lldd_dev_found(struct domain_device *dev)
162{
163 int res = 0;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *shost = sas_ha->core.shost;
166 struct sas_internal *i = to_sas_internal(shost->transportt);
167
168 if (i->dft->lldd_dev_found) {
169 res = i->dft->lldd_dev_found(dev);
170 if (res) {
171 printk("sas: driver on pcidev %s cannot handle "
172 "device %llx, error:%d\n",
173 dev_name(sas_ha->dev),
174 SAS_ADDR(dev->sas_addr), res);
175 }
176 }
177 return res;
178}
179
180
181void sas_notify_lldd_dev_gone(struct domain_device *dev)
182{
183 struct sas_ha_struct *sas_ha = dev->port->ha;
184 struct Scsi_Host *shost = sas_ha->core.shost;
185 struct sas_internal *i = to_sas_internal(shost->transportt);
186
187 if (i->dft->lldd_dev_gone)
188 i->dft->lldd_dev_gone(dev);
189}
190
191/* ---------- Common/dispatchers ---------- */
192
193
194/**
195 * sas_discover_end_dev -- discover an end device (SSP, etc)
196 * @end: pointer to domain device of interest
197 *
198 * See comment in sas_discover_sata().
199 */
200int sas_discover_end_dev(struct domain_device *dev)
201{
202 int res;
203
204 res = sas_notify_lldd_dev_found(dev);
205 if (res)
206 goto out_err2;
207
208 res = sas_rphy_add(dev->rphy);
209 if (res)
210 goto out_err;
211
212 return 0;
213
214out_err:
215 sas_notify_lldd_dev_gone(dev);
216out_err2:
217 return res;
218}
219
220/* ---------- Device registration and unregistration ---------- */
221
222static inline void sas_unregister_common_dev(struct domain_device *dev)
223{
224 sas_notify_lldd_dev_gone(dev);
225 if (!dev->parent)
226 dev->port->port_dev = NULL;
227 else
228 list_del_init(&dev->siblings);
229 list_del_init(&dev->dev_list_node);
230}
231
232void sas_unregister_dev(struct domain_device *dev)
233{
234 if (dev->rphy) {
235 sas_remove_children(&dev->rphy->dev);
236 sas_rphy_delete(dev->rphy);
237 dev->rphy = NULL;
238 }
239 if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
240 /* remove the phys and ports, everything else should be gone */
241 kfree(dev->ex_dev.ex_phy);
242 dev->ex_dev.ex_phy = NULL;
243 }
244 sas_unregister_common_dev(dev);
245}
246
247void sas_unregister_domain_devices(struct asd_sas_port *port)
248{
249 struct domain_device *dev, *n;
250
251 list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node)
252 sas_unregister_dev(dev);
253
254 port->port->rphy = NULL;
255
256}
257
258/* ---------- Discovery and Revalidation ---------- */
259
260/**
261 * sas_discover_domain -- discover the domain
262 * @port: port to the domain of interest
263 *
264 * NOTE: this process _must_ quit (return) as soon as any connection
265 * errors are encountered. Connection recovery is done elsewhere.
266 * Discover process only interrogates devices in order to discover the
267 * domain.
268 */
269static void sas_discover_domain(struct work_struct *work)
270{
271 struct domain_device *dev;
272 int error = 0;
273 struct sas_discovery_event *ev =
274 container_of(work, struct sas_discovery_event, work);
275 struct asd_sas_port *port = ev->port;
276
277 sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
278 &port->disc.pending);
279
280 if (port->port_dev)
281 return;
282
283 error = sas_get_port_device(port);
284 if (error)
285 return;
286 dev = port->port_dev;
287
288 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
289 task_pid_nr(current));
290
291 switch (dev->dev_type) {
292 case SAS_END_DEV:
293 error = sas_discover_end_dev(dev);
294 break;
295 case EDGE_DEV:
296 case FANOUT_DEV:
297 error = sas_discover_root_expander(dev);
298 break;
299 case SATA_DEV:
300 case SATA_PM:
301#ifdef CONFIG_SCSI_SAS_ATA
302 error = sas_discover_sata(dev);
303 break;
304#else
305 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
306 /* Fall through */
307#endif
308 default:
309 error = -ENXIO;
310 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
311 break;
312 }
313
314 if (error) {
315 sas_rphy_free(dev->rphy);
316 dev->rphy = NULL;
317
318 spin_lock_irq(&port->dev_list_lock);
319 list_del_init(&dev->dev_list_node);
320 spin_unlock_irq(&port->dev_list_lock);
321
322 kfree(dev); /* not kobject_register-ed yet */
323 port->port_dev = NULL;
324 }
325
326 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
327 task_pid_nr(current), error);
328}
329
330static void sas_revalidate_domain(struct work_struct *work)
331{
332 int res = 0;
333 struct sas_discovery_event *ev =
334 container_of(work, struct sas_discovery_event, work);
335 struct asd_sas_port *port = ev->port;
336
337 sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
338 &port->disc.pending);
339
340 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
341 task_pid_nr(current));
342 if (port->port_dev)
343 res = sas_ex_revalidate_domain(port->port_dev);
344
345 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
346 port->id, task_pid_nr(current), res);
347}
348
349/* ---------- Events ---------- */
350
351int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
352{
353 struct sas_discovery *disc;
354
355 if (!port)
356 return 0;
357 disc = &port->disc;
358
359 BUG_ON(ev >= DISC_NUM_EVENTS);
360
361 sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
362 &disc->disc_work[ev].work, port->ha);
363
364 return 0;
365}
366
367/**
368 * sas_init_disc -- initialize the discovery struct in the port
369 * @port: pointer to struct port
370 *
371 * Called when the ports are being initialized.
372 */
373void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
374{
375 int i;
376
377 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
378 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
379 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
380 };
381
382 spin_lock_init(&disc->disc_event_lock);
383 disc->pending = 0;
384 for (i = 0; i < DISC_NUM_EVENTS; i++) {
385 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
386 disc->disc_work[i].port = port;
387 }
388}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial Attached SCSI (SAS) Discover process
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9#include <linux/scatterlist.h>
10#include <linux/slab.h>
11#include <linux/async.h>
12#include <scsi/scsi_host.h>
13#include <scsi/scsi_eh.h>
14#include "sas_internal.h"
15
16#include <scsi/scsi_transport.h>
17#include <scsi/scsi_transport_sas.h>
18#include <scsi/sas_ata.h>
19#include "../scsi_sas_internal.h"
20
21/* ---------- Basic task processing for discovery purposes ---------- */
22
23void sas_init_dev(struct domain_device *dev)
24{
25 switch (dev->dev_type) {
26 case SAS_END_DEVICE:
27 INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
28 break;
29 case SAS_EDGE_EXPANDER_DEVICE:
30 case SAS_FANOUT_EXPANDER_DEVICE:
31 INIT_LIST_HEAD(&dev->ex_dev.children);
32 mutex_init(&dev->ex_dev.cmd_mutex);
33 break;
34 default:
35 break;
36 }
37}
38
39/* ---------- Domain device discovery ---------- */
40
41/**
42 * sas_get_port_device - Discover devices which caused port creation
43 * @port: pointer to struct sas_port of interest
44 *
45 * Devices directly attached to a HA port, have no parent. This is
46 * how we know they are (domain) "root" devices. All other devices
47 * do, and should have their "parent" pointer set appropriately as
48 * soon as a child device is discovered.
49 */
50static int sas_get_port_device(struct asd_sas_port *port)
51{
52 struct asd_sas_phy *phy;
53 struct sas_rphy *rphy;
54 struct domain_device *dev;
55 int rc = -ENODEV;
56
57 dev = sas_alloc_device();
58 if (!dev)
59 return -ENOMEM;
60
61 spin_lock_irq(&port->phy_list_lock);
62 if (list_empty(&port->phy_list)) {
63 spin_unlock_irq(&port->phy_list_lock);
64 sas_put_device(dev);
65 return -ENODEV;
66 }
67 phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
68 spin_lock(&phy->frame_rcvd_lock);
69 memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
70 (size_t)phy->frame_rcvd_size));
71 spin_unlock(&phy->frame_rcvd_lock);
72 spin_unlock_irq(&port->phy_list_lock);
73
74 if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
75 struct dev_to_host_fis *fis =
76 (struct dev_to_host_fis *) dev->frame_rcvd;
77 if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
78 fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
79 && (fis->device & ~0x10) == 0)
80 dev->dev_type = SAS_SATA_PM;
81 else
82 dev->dev_type = SAS_SATA_DEV;
83 dev->tproto = SAS_PROTOCOL_SATA;
84 } else {
85 struct sas_identify_frame *id =
86 (struct sas_identify_frame *) dev->frame_rcvd;
87 dev->dev_type = id->dev_type;
88 dev->iproto = id->initiator_bits;
89 dev->tproto = id->target_bits;
90 }
91
92 sas_init_dev(dev);
93
94 dev->port = port;
95 switch (dev->dev_type) {
96 case SAS_SATA_DEV:
97 rc = sas_ata_init(dev);
98 if (rc) {
99 rphy = NULL;
100 break;
101 }
102 /* fall through */
103 case SAS_END_DEVICE:
104 rphy = sas_end_device_alloc(port->port);
105 break;
106 case SAS_EDGE_EXPANDER_DEVICE:
107 rphy = sas_expander_alloc(port->port,
108 SAS_EDGE_EXPANDER_DEVICE);
109 break;
110 case SAS_FANOUT_EXPANDER_DEVICE:
111 rphy = sas_expander_alloc(port->port,
112 SAS_FANOUT_EXPANDER_DEVICE);
113 break;
114 default:
115 pr_warn("ERROR: Unidentified device type %d\n", dev->dev_type);
116 rphy = NULL;
117 break;
118 }
119
120 if (!rphy) {
121 sas_put_device(dev);
122 return rc;
123 }
124
125 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
126 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
127 sas_fill_in_rphy(dev, rphy);
128 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
129 port->port_dev = dev;
130 dev->linkrate = port->linkrate;
131 dev->min_linkrate = port->linkrate;
132 dev->max_linkrate = port->linkrate;
133 dev->pathways = port->num_phys;
134 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
135 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
136 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
137 port->disc.max_level = 0;
138 sas_device_set_phy(dev, port->port);
139
140 dev->rphy = rphy;
141 get_device(&dev->rphy->dev);
142
143 if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE)
144 list_add_tail(&dev->disco_list_node, &port->disco_list);
145 else {
146 spin_lock_irq(&port->dev_list_lock);
147 list_add_tail(&dev->dev_list_node, &port->dev_list);
148 spin_unlock_irq(&port->dev_list_lock);
149 }
150
151 spin_lock_irq(&port->phy_list_lock);
152 list_for_each_entry(phy, &port->phy_list, port_phy_el)
153 sas_phy_set_target(phy, dev);
154 spin_unlock_irq(&port->phy_list_lock);
155
156 return 0;
157}
158
159/* ---------- Discover and Revalidate ---------- */
160
161int sas_notify_lldd_dev_found(struct domain_device *dev)
162{
163 int res = 0;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *shost = sas_ha->core.shost;
166 struct sas_internal *i = to_sas_internal(shost->transportt);
167
168 if (!i->dft->lldd_dev_found)
169 return 0;
170
171 res = i->dft->lldd_dev_found(dev);
172 if (res) {
173 pr_warn("driver on host %s cannot handle device %llx, error:%d\n",
174 dev_name(sas_ha->dev),
175 SAS_ADDR(dev->sas_addr), res);
176 }
177 set_bit(SAS_DEV_FOUND, &dev->state);
178 kref_get(&dev->kref);
179 return res;
180}
181
182
183void sas_notify_lldd_dev_gone(struct domain_device *dev)
184{
185 struct sas_ha_struct *sas_ha = dev->port->ha;
186 struct Scsi_Host *shost = sas_ha->core.shost;
187 struct sas_internal *i = to_sas_internal(shost->transportt);
188
189 if (!i->dft->lldd_dev_gone)
190 return;
191
192 if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
193 i->dft->lldd_dev_gone(dev);
194 sas_put_device(dev);
195 }
196}
197
198static void sas_probe_devices(struct asd_sas_port *port)
199{
200 struct domain_device *dev, *n;
201
202 /* devices must be domain members before link recovery and probe */
203 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
204 spin_lock_irq(&port->dev_list_lock);
205 list_add_tail(&dev->dev_list_node, &port->dev_list);
206 spin_unlock_irq(&port->dev_list_lock);
207 }
208
209 sas_probe_sata(port);
210
211 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
212 int err;
213
214 err = sas_rphy_add(dev->rphy);
215 if (err)
216 sas_fail_probe(dev, __func__, err);
217 else
218 list_del_init(&dev->disco_list_node);
219 }
220}
221
222static void sas_suspend_devices(struct work_struct *work)
223{
224 struct asd_sas_phy *phy;
225 struct domain_device *dev;
226 struct sas_discovery_event *ev = to_sas_discovery_event(work);
227 struct asd_sas_port *port = ev->port;
228 struct Scsi_Host *shost = port->ha->core.shost;
229 struct sas_internal *si = to_sas_internal(shost->transportt);
230
231 clear_bit(DISCE_SUSPEND, &port->disc.pending);
232
233 sas_suspend_sata(port);
234
235 /* lldd is free to forget the domain_device across the
236 * suspension, we force the issue here to keep the reference
237 * counts aligned
238 */
239 list_for_each_entry(dev, &port->dev_list, dev_list_node)
240 sas_notify_lldd_dev_gone(dev);
241
242 /* we are suspending, so we know events are disabled and
243 * phy_list is not being mutated
244 */
245 list_for_each_entry(phy, &port->phy_list, port_phy_el) {
246 if (si->dft->lldd_port_deformed)
247 si->dft->lldd_port_deformed(phy);
248 phy->suspended = 1;
249 port->suspended = 1;
250 }
251}
252
253static void sas_resume_devices(struct work_struct *work)
254{
255 struct sas_discovery_event *ev = to_sas_discovery_event(work);
256 struct asd_sas_port *port = ev->port;
257
258 clear_bit(DISCE_RESUME, &port->disc.pending);
259
260 sas_resume_sata(port);
261}
262
263/**
264 * sas_discover_end_dev - discover an end device (SSP, etc)
265 * @dev: pointer to domain device of interest
266 *
267 * See comment in sas_discover_sata().
268 */
269int sas_discover_end_dev(struct domain_device *dev)
270{
271 int res;
272
273 res = sas_notify_lldd_dev_found(dev);
274 if (res)
275 return res;
276
277 return 0;
278}
279
280/* ---------- Device registration and unregistration ---------- */
281
282void sas_free_device(struct kref *kref)
283{
284 struct domain_device *dev = container_of(kref, typeof(*dev), kref);
285
286 put_device(&dev->rphy->dev);
287 dev->rphy = NULL;
288
289 if (dev->parent)
290 sas_put_device(dev->parent);
291
292 sas_port_put_phy(dev->phy);
293 dev->phy = NULL;
294
295 /* remove the phys and ports, everything else should be gone */
296 if (dev_is_expander(dev->dev_type))
297 kfree(dev->ex_dev.ex_phy);
298
299 if (dev_is_sata(dev) && dev->sata_dev.ap) {
300 ata_sas_tport_delete(dev->sata_dev.ap);
301 ata_sas_port_destroy(dev->sata_dev.ap);
302 ata_host_put(dev->sata_dev.ata_host);
303 dev->sata_dev.ata_host = NULL;
304 dev->sata_dev.ap = NULL;
305 }
306
307 kfree(dev);
308}
309
310static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
311{
312 struct sas_ha_struct *ha = port->ha;
313
314 sas_notify_lldd_dev_gone(dev);
315 if (!dev->parent)
316 dev->port->port_dev = NULL;
317 else
318 list_del_init(&dev->siblings);
319
320 spin_lock_irq(&port->dev_list_lock);
321 list_del_init(&dev->dev_list_node);
322 if (dev_is_sata(dev))
323 sas_ata_end_eh(dev->sata_dev.ap);
324 spin_unlock_irq(&port->dev_list_lock);
325
326 spin_lock_irq(&ha->lock);
327 if (dev->dev_type == SAS_END_DEVICE &&
328 !list_empty(&dev->ssp_dev.eh_list_node)) {
329 list_del_init(&dev->ssp_dev.eh_list_node);
330 ha->eh_active--;
331 }
332 spin_unlock_irq(&ha->lock);
333
334 sas_put_device(dev);
335}
336
337void sas_destruct_devices(struct asd_sas_port *port)
338{
339 struct domain_device *dev, *n;
340
341 list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
342 list_del_init(&dev->disco_list_node);
343
344 sas_remove_children(&dev->rphy->dev);
345 sas_rphy_delete(dev->rphy);
346 sas_unregister_common_dev(port, dev);
347 }
348}
349
350static void sas_destruct_ports(struct asd_sas_port *port)
351{
352 struct sas_port *sas_port, *p;
353
354 list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
355 list_del_init(&sas_port->del_list);
356 sas_port_delete(sas_port);
357 }
358}
359
360void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
361{
362 if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
363 !list_empty(&dev->disco_list_node)) {
364 /* this rphy never saw sas_rphy_add */
365 list_del_init(&dev->disco_list_node);
366 sas_rphy_free(dev->rphy);
367 sas_unregister_common_dev(port, dev);
368 return;
369 }
370
371 if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
372 sas_rphy_unlink(dev->rphy);
373 list_move_tail(&dev->disco_list_node, &port->destroy_list);
374 }
375}
376
377void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
378{
379 struct domain_device *dev, *n;
380
381 list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
382 if (gone)
383 set_bit(SAS_DEV_GONE, &dev->state);
384 sas_unregister_dev(port, dev);
385 }
386
387 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
388 sas_unregister_dev(port, dev);
389
390 port->port->rphy = NULL;
391
392}
393
394void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
395{
396 struct sas_ha_struct *ha;
397 struct sas_phy *new_phy;
398
399 if (!dev)
400 return;
401
402 ha = dev->port->ha;
403 new_phy = sas_port_get_phy(port);
404
405 /* pin and record last seen phy */
406 spin_lock_irq(&ha->phy_port_lock);
407 if (new_phy) {
408 sas_port_put_phy(dev->phy);
409 dev->phy = new_phy;
410 }
411 spin_unlock_irq(&ha->phy_port_lock);
412}
413
414/* ---------- Discovery and Revalidation ---------- */
415
416/**
417 * sas_discover_domain - discover the domain
418 * @work: work structure embedded in port domain device.
419 *
420 * NOTE: this process _must_ quit (return) as soon as any connection
421 * errors are encountered. Connection recovery is done elsewhere.
422 * Discover process only interrogates devices in order to discover the
423 * domain.
424 */
425static void sas_discover_domain(struct work_struct *work)
426{
427 struct domain_device *dev;
428 int error = 0;
429 struct sas_discovery_event *ev = to_sas_discovery_event(work);
430 struct asd_sas_port *port = ev->port;
431
432 clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
433
434 if (port->port_dev)
435 return;
436
437 error = sas_get_port_device(port);
438 if (error)
439 return;
440 dev = port->port_dev;
441
442 pr_debug("DOING DISCOVERY on port %d, pid:%d\n", port->id,
443 task_pid_nr(current));
444
445 switch (dev->dev_type) {
446 case SAS_END_DEVICE:
447 error = sas_discover_end_dev(dev);
448 break;
449 case SAS_EDGE_EXPANDER_DEVICE:
450 case SAS_FANOUT_EXPANDER_DEVICE:
451 error = sas_discover_root_expander(dev);
452 break;
453 case SAS_SATA_DEV:
454 case SAS_SATA_PM:
455#ifdef CONFIG_SCSI_SAS_ATA
456 error = sas_discover_sata(dev);
457 break;
458#else
459 pr_notice("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
460 /* Fall through */
461#endif
462 /* Fall through - only for the #else condition above. */
463 default:
464 error = -ENXIO;
465 pr_err("unhandled device %d\n", dev->dev_type);
466 break;
467 }
468
469 if (error) {
470 sas_rphy_free(dev->rphy);
471 list_del_init(&dev->disco_list_node);
472 spin_lock_irq(&port->dev_list_lock);
473 list_del_init(&dev->dev_list_node);
474 spin_unlock_irq(&port->dev_list_lock);
475
476 sas_put_device(dev);
477 port->port_dev = NULL;
478 }
479
480 sas_probe_devices(port);
481
482 pr_debug("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
483 task_pid_nr(current), error);
484}
485
486static void sas_revalidate_domain(struct work_struct *work)
487{
488 int res = 0;
489 struct sas_discovery_event *ev = to_sas_discovery_event(work);
490 struct asd_sas_port *port = ev->port;
491 struct sas_ha_struct *ha = port->ha;
492 struct domain_device *ddev = port->port_dev;
493
494 /* prevent revalidation from finding sata links in recovery */
495 mutex_lock(&ha->disco_mutex);
496 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
497 pr_debug("REVALIDATION DEFERRED on port %d, pid:%d\n",
498 port->id, task_pid_nr(current));
499 goto out;
500 }
501
502 clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
503
504 pr_debug("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
505 task_pid_nr(current));
506
507 if (ddev && dev_is_expander(ddev->dev_type))
508 res = sas_ex_revalidate_domain(ddev);
509
510 pr_debug("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
511 port->id, task_pid_nr(current), res);
512 out:
513 mutex_unlock(&ha->disco_mutex);
514
515 sas_destruct_devices(port);
516 sas_destruct_ports(port);
517 sas_probe_devices(port);
518}
519
520/* ---------- Events ---------- */
521
522static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
523{
524 /* chained work is not subject to SA_HA_DRAINING or
525 * SAS_HA_REGISTERED, because it is either submitted in the
526 * workqueue, or known to be submitted from a context that is
527 * not racing against draining
528 */
529 queue_work(ha->disco_q, &sw->work);
530}
531
532static void sas_chain_event(int event, unsigned long *pending,
533 struct sas_work *sw,
534 struct sas_ha_struct *ha)
535{
536 if (!test_and_set_bit(event, pending)) {
537 unsigned long flags;
538
539 spin_lock_irqsave(&ha->lock, flags);
540 sas_chain_work(ha, sw);
541 spin_unlock_irqrestore(&ha->lock, flags);
542 }
543}
544
545int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
546{
547 struct sas_discovery *disc;
548
549 if (!port)
550 return 0;
551 disc = &port->disc;
552
553 BUG_ON(ev >= DISC_NUM_EVENTS);
554
555 sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
556
557 return 0;
558}
559
560/**
561 * sas_init_disc - initialize the discovery struct in the port
562 * @disc: port discovery structure
563 * @port: pointer to struct port
564 *
565 * Called when the ports are being initialized.
566 */
567void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
568{
569 int i;
570
571 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
572 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
573 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
574 [DISCE_SUSPEND] = sas_suspend_devices,
575 [DISCE_RESUME] = sas_resume_devices,
576 };
577
578 disc->pending = 0;
579 for (i = 0; i < DISC_NUM_EVENTS; i++) {
580 INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
581 disc->disc_work[i].port = port;
582 }
583}