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