Loading...
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 <scsi/scsi_host.h>
12#include <scsi/scsi_eh.h>
13#include "sas_internal.h"
14
15#include <scsi/scsi_transport.h>
16#include <scsi/scsi_transport_sas.h>
17#include <scsi/sas_ata.h>
18#include "scsi_sas_internal.h"
19
20/* ---------- Basic task processing for discovery purposes ---------- */
21
22void sas_init_dev(struct domain_device *dev)
23{
24 switch (dev->dev_type) {
25 case SAS_END_DEVICE:
26 INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
27 break;
28 case SAS_EDGE_EXPANDER_DEVICE:
29 case SAS_FANOUT_EXPANDER_DEVICE:
30 INIT_LIST_HEAD(&dev->ex_dev.children);
31 mutex_init(&dev->ex_dev.cmd_mutex);
32 break;
33 default:
34 break;
35 }
36}
37
38/* ---------- Domain device discovery ---------- */
39
40/**
41 * sas_get_port_device - Discover devices which caused port creation
42 * @port: pointer to struct sas_port of interest
43 *
44 * Devices directly attached to a HA port, have no parent. This is
45 * how we know they are (domain) "root" devices. All other devices
46 * do, and should have their "parent" pointer set appropriately as
47 * soon as a child device is discovered.
48 */
49static int sas_get_port_device(struct asd_sas_port *port)
50{
51 struct asd_sas_phy *phy;
52 struct sas_rphy *rphy;
53 struct domain_device *dev;
54 int rc = -ENODEV;
55
56 dev = sas_alloc_device();
57 if (!dev)
58 return -ENOMEM;
59
60 spin_lock_irq(&port->phy_list_lock);
61 if (list_empty(&port->phy_list)) {
62 spin_unlock_irq(&port->phy_list_lock);
63 sas_put_device(dev);
64 return -ENODEV;
65 }
66 phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
67 spin_lock(&phy->frame_rcvd_lock);
68 memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
69 (size_t)phy->frame_rcvd_size));
70 spin_unlock(&phy->frame_rcvd_lock);
71 spin_unlock_irq(&port->phy_list_lock);
72
73 if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
74 struct dev_to_host_fis *fis =
75 (struct dev_to_host_fis *) dev->frame_rcvd;
76 if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
77 fis->byte_count_low == 0x69 && fis->byte_count_high == 0x96
78 && (fis->device & ~0x10) == 0)
79 dev->dev_type = SAS_SATA_PM;
80 else
81 dev->dev_type = SAS_SATA_DEV;
82 dev->tproto = SAS_PROTOCOL_SATA;
83 } else if (port->oob_mode == SAS_OOB_MODE) {
84 struct sas_identify_frame *id =
85 (struct sas_identify_frame *) dev->frame_rcvd;
86 dev->dev_type = id->dev_type;
87 dev->iproto = id->initiator_bits;
88 dev->tproto = id->target_bits;
89 } else {
90 /* If the oob mode is OOB_NOT_CONNECTED, the port is
91 * disconnected due to race with PHY down. We cannot
92 * continue to discover this port
93 */
94 sas_put_device(dev);
95 pr_warn("Port %016llx is disconnected when discovering\n",
96 SAS_ADDR(port->attached_sas_addr));
97 return -ENODEV;
98 }
99
100 sas_init_dev(dev);
101
102 dev->port = port;
103 switch (dev->dev_type) {
104 case SAS_SATA_DEV:
105 rc = sas_ata_init(dev);
106 if (rc) {
107 rphy = NULL;
108 break;
109 }
110 fallthrough;
111 case SAS_END_DEVICE:
112 rphy = sas_end_device_alloc(port->port);
113 break;
114 case SAS_EDGE_EXPANDER_DEVICE:
115 rphy = sas_expander_alloc(port->port,
116 SAS_EDGE_EXPANDER_DEVICE);
117 break;
118 case SAS_FANOUT_EXPANDER_DEVICE:
119 rphy = sas_expander_alloc(port->port,
120 SAS_FANOUT_EXPANDER_DEVICE);
121 break;
122 default:
123 pr_warn("ERROR: Unidentified device type %d\n", dev->dev_type);
124 rphy = NULL;
125 break;
126 }
127
128 if (!rphy) {
129 sas_put_device(dev);
130 return rc;
131 }
132
133 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
134 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
135 sas_fill_in_rphy(dev, rphy);
136 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
137 port->port_dev = dev;
138 dev->linkrate = port->linkrate;
139 dev->min_linkrate = port->linkrate;
140 dev->max_linkrate = port->linkrate;
141 dev->pathways = port->num_phys;
142 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
143 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
144 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
145 port->disc.max_level = 0;
146 sas_device_set_phy(dev, port->port);
147
148 dev->rphy = rphy;
149 get_device(&dev->rphy->dev);
150
151 if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE)
152 list_add_tail(&dev->disco_list_node, &port->disco_list);
153 else {
154 spin_lock_irq(&port->dev_list_lock);
155 list_add_tail(&dev->dev_list_node, &port->dev_list);
156 spin_unlock_irq(&port->dev_list_lock);
157 }
158
159 spin_lock_irq(&port->phy_list_lock);
160 list_for_each_entry(phy, &port->phy_list, port_phy_el)
161 sas_phy_set_target(phy, dev);
162 spin_unlock_irq(&port->phy_list_lock);
163
164 return 0;
165}
166
167/* ---------- Discover and Revalidate ---------- */
168
169int sas_notify_lldd_dev_found(struct domain_device *dev)
170{
171 int res = 0;
172 struct sas_ha_struct *sas_ha = dev->port->ha;
173 struct Scsi_Host *shost = sas_ha->shost;
174 struct sas_internal *i = to_sas_internal(shost->transportt);
175
176 if (!i->dft->lldd_dev_found)
177 return 0;
178
179 res = i->dft->lldd_dev_found(dev);
180 if (res) {
181 pr_warn("driver on host %s cannot handle device %016llx, error:%d\n",
182 dev_name(sas_ha->dev),
183 SAS_ADDR(dev->sas_addr), res);
184 return res;
185 }
186 set_bit(SAS_DEV_FOUND, &dev->state);
187 kref_get(&dev->kref);
188 return 0;
189}
190
191
192void sas_notify_lldd_dev_gone(struct domain_device *dev)
193{
194 struct sas_ha_struct *sas_ha = dev->port->ha;
195 struct Scsi_Host *shost = sas_ha->shost;
196 struct sas_internal *i = to_sas_internal(shost->transportt);
197
198 if (!i->dft->lldd_dev_gone)
199 return;
200
201 if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
202 i->dft->lldd_dev_gone(dev);
203 sas_put_device(dev);
204 }
205}
206
207static void sas_probe_devices(struct asd_sas_port *port)
208{
209 struct domain_device *dev, *n;
210
211 /* devices must be domain members before link recovery and probe */
212 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
213 spin_lock_irq(&port->dev_list_lock);
214 list_add_tail(&dev->dev_list_node, &port->dev_list);
215 spin_unlock_irq(&port->dev_list_lock);
216 }
217
218 sas_probe_sata(port);
219
220 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
221 int err;
222
223 err = sas_rphy_add(dev->rphy);
224 if (err)
225 sas_fail_probe(dev, __func__, err);
226 else
227 list_del_init(&dev->disco_list_node);
228 }
229}
230
231static void sas_suspend_devices(struct work_struct *work)
232{
233 struct asd_sas_phy *phy;
234 struct domain_device *dev;
235 struct sas_discovery_event *ev = to_sas_discovery_event(work);
236 struct asd_sas_port *port = ev->port;
237 struct Scsi_Host *shost = port->ha->shost;
238 struct sas_internal *si = to_sas_internal(shost->transportt);
239
240 clear_bit(DISCE_SUSPEND, &port->disc.pending);
241
242 sas_suspend_sata(port);
243
244 /* lldd is free to forget the domain_device across the
245 * suspension, we force the issue here to keep the reference
246 * counts aligned
247 */
248 list_for_each_entry(dev, &port->dev_list, dev_list_node)
249 sas_notify_lldd_dev_gone(dev);
250
251 /* we are suspending, so we know events are disabled and
252 * phy_list is not being mutated
253 */
254 list_for_each_entry(phy, &port->phy_list, port_phy_el) {
255 if (si->dft->lldd_port_deformed)
256 si->dft->lldd_port_deformed(phy);
257 phy->suspended = 1;
258 port->suspended = 1;
259 }
260}
261
262static void sas_resume_devices(struct work_struct *work)
263{
264 struct sas_discovery_event *ev = to_sas_discovery_event(work);
265 struct asd_sas_port *port = ev->port;
266
267 clear_bit(DISCE_RESUME, &port->disc.pending);
268
269 sas_resume_sata(port);
270}
271
272/**
273 * sas_discover_end_dev - discover an end device (SSP, etc)
274 * @dev: pointer to domain device of interest
275 *
276 * See comment in sas_discover_sata().
277 */
278static int sas_discover_end_dev(struct domain_device *dev)
279{
280 return sas_notify_lldd_dev_found(dev);
281}
282
283/* ---------- Device registration and unregistration ---------- */
284
285void sas_free_device(struct kref *kref)
286{
287 struct domain_device *dev = container_of(kref, typeof(*dev), kref);
288
289 put_device(&dev->rphy->dev);
290 dev->rphy = NULL;
291
292 if (dev->parent)
293 sas_put_device(dev->parent);
294
295 sas_port_put_phy(dev->phy);
296 dev->phy = NULL;
297
298 /* remove the phys and ports, everything else should be gone */
299 if (dev_is_expander(dev->dev_type))
300 kfree(dev->ex_dev.ex_phy);
301
302 if (dev_is_sata(dev) && dev->sata_dev.ap) {
303 ata_sas_tport_delete(dev->sata_dev.ap);
304 kfree(dev->sata_dev.ap);
305 ata_host_put(dev->sata_dev.ata_host);
306 dev->sata_dev.ata_host = NULL;
307 dev->sata_dev.ap = NULL;
308 }
309
310 kfree(dev);
311}
312
313static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
314{
315 struct sas_ha_struct *ha = port->ha;
316
317 sas_notify_lldd_dev_gone(dev);
318 if (!dev->parent)
319 dev->port->port_dev = NULL;
320 else
321 list_del_init(&dev->siblings);
322
323 spin_lock_irq(&port->dev_list_lock);
324 list_del_init(&dev->dev_list_node);
325 if (dev_is_sata(dev))
326 sas_ata_end_eh(dev->sata_dev.ap);
327 spin_unlock_irq(&port->dev_list_lock);
328
329 spin_lock_irq(&ha->lock);
330 if (dev->dev_type == SAS_END_DEVICE &&
331 !list_empty(&dev->ssp_dev.eh_list_node)) {
332 list_del_init(&dev->ssp_dev.eh_list_node);
333 ha->eh_active--;
334 }
335 spin_unlock_irq(&ha->lock);
336
337 sas_put_device(dev);
338}
339
340void sas_destruct_devices(struct asd_sas_port *port)
341{
342 struct domain_device *dev, *n;
343
344 list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
345 list_del_init(&dev->disco_list_node);
346
347 sas_remove_children(&dev->rphy->dev);
348 sas_rphy_delete(dev->rphy);
349 sas_unregister_common_dev(port, dev);
350 }
351}
352
353static void sas_destruct_ports(struct asd_sas_port *port)
354{
355 struct sas_port *sas_port, *p;
356
357 list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
358 list_del_init(&sas_port->del_list);
359 sas_port_delete(sas_port);
360 }
361}
362
363static bool sas_abort_cmd(struct request *req, void *data)
364{
365 struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
366 struct domain_device *dev = data;
367
368 if (dev == cmd_to_domain_dev(cmd))
369 blk_abort_request(req);
370 return true;
371}
372
373static void sas_abort_device_scsi_cmds(struct domain_device *dev)
374{
375 struct sas_ha_struct *sas_ha = dev->port->ha;
376 struct Scsi_Host *shost = sas_ha->shost;
377
378 if (dev_is_expander(dev->dev_type))
379 return;
380
381 /*
382 * For removed device with active IOs, the user space applications have
383 * to spend very long time waiting for the timeout. This is not
384 * necessary because a removed device will not return the IOs.
385 * Abort the inflight IOs here so that EH can be quickly kicked in.
386 */
387 blk_mq_tagset_busy_iter(&shost->tag_set, sas_abort_cmd, dev);
388}
389
390void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
391{
392 if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
393 !list_empty(&dev->disco_list_node)) {
394 /* this rphy never saw sas_rphy_add */
395 list_del_init(&dev->disco_list_node);
396 sas_rphy_free(dev->rphy);
397 sas_unregister_common_dev(port, dev);
398 return;
399 }
400
401 if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
402 if (test_bit(SAS_DEV_GONE, &dev->state))
403 sas_abort_device_scsi_cmds(dev);
404 sas_rphy_unlink(dev->rphy);
405 list_move_tail(&dev->disco_list_node, &port->destroy_list);
406 }
407}
408
409void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
410{
411 struct domain_device *dev, *n;
412
413 list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
414 if (gone)
415 set_bit(SAS_DEV_GONE, &dev->state);
416 sas_unregister_dev(port, dev);
417 }
418
419 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
420 sas_unregister_dev(port, dev);
421
422 port->port->rphy = NULL;
423
424}
425
426void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
427{
428 struct sas_ha_struct *ha;
429 struct sas_phy *new_phy;
430
431 if (!dev)
432 return;
433
434 ha = dev->port->ha;
435 new_phy = sas_port_get_phy(port);
436
437 /* pin and record last seen phy */
438 spin_lock_irq(&ha->phy_port_lock);
439 if (new_phy) {
440 sas_port_put_phy(dev->phy);
441 dev->phy = new_phy;
442 }
443 spin_unlock_irq(&ha->phy_port_lock);
444}
445
446/* ---------- Discovery and Revalidation ---------- */
447
448/**
449 * sas_discover_domain - discover the domain
450 * @work: work structure embedded in port domain device.
451 *
452 * NOTE: this process _must_ quit (return) as soon as any connection
453 * errors are encountered. Connection recovery is done elsewhere.
454 * Discover process only interrogates devices in order to discover the
455 * domain.
456 */
457static void sas_discover_domain(struct work_struct *work)
458{
459 struct domain_device *dev;
460 int error = 0;
461 struct sas_discovery_event *ev = to_sas_discovery_event(work);
462 struct asd_sas_port *port = ev->port;
463
464 clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
465
466 if (port->port_dev)
467 return;
468
469 error = sas_get_port_device(port);
470 if (error)
471 return;
472 dev = port->port_dev;
473
474 pr_debug("DOING DISCOVERY on port %d, pid:%d\n", port->id,
475 task_pid_nr(current));
476
477 switch (dev->dev_type) {
478 case SAS_END_DEVICE:
479 error = sas_discover_end_dev(dev);
480 break;
481 case SAS_EDGE_EXPANDER_DEVICE:
482 case SAS_FANOUT_EXPANDER_DEVICE:
483 error = sas_discover_root_expander(dev);
484 break;
485 case SAS_SATA_DEV:
486 case SAS_SATA_PM:
487 error = sas_discover_sata(dev);
488 break;
489 default:
490 error = -ENXIO;
491 pr_err("unhandled device %d\n", dev->dev_type);
492 break;
493 }
494
495 if (error) {
496 sas_rphy_free(dev->rphy);
497 list_del_init(&dev->disco_list_node);
498 spin_lock_irq(&port->dev_list_lock);
499 list_del_init(&dev->dev_list_node);
500 spin_unlock_irq(&port->dev_list_lock);
501
502 sas_put_device(dev);
503 port->port_dev = NULL;
504 }
505
506 sas_probe_devices(port);
507
508 pr_debug("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
509 task_pid_nr(current), error);
510}
511
512static void sas_revalidate_domain(struct work_struct *work)
513{
514 int res = 0;
515 struct sas_discovery_event *ev = to_sas_discovery_event(work);
516 struct asd_sas_port *port = ev->port;
517 struct sas_ha_struct *ha = port->ha;
518 struct domain_device *ddev = port->port_dev;
519
520 /* prevent revalidation from finding sata links in recovery */
521 mutex_lock(&ha->disco_mutex);
522 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
523 pr_debug("REVALIDATION DEFERRED on port %d, pid:%d\n",
524 port->id, task_pid_nr(current));
525 goto out;
526 }
527
528 clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
529
530 pr_debug("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
531 task_pid_nr(current));
532
533 if (ddev && dev_is_expander(ddev->dev_type))
534 res = sas_ex_revalidate_domain(ddev);
535
536 pr_debug("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
537 port->id, task_pid_nr(current), res);
538 out:
539 mutex_unlock(&ha->disco_mutex);
540
541 sas_destruct_devices(port);
542 sas_destruct_ports(port);
543 sas_probe_devices(port);
544}
545
546/* ---------- Events ---------- */
547
548static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
549{
550 /* chained work is not subject to SA_HA_DRAINING or
551 * SAS_HA_REGISTERED, because it is either submitted in the
552 * workqueue, or known to be submitted from a context that is
553 * not racing against draining
554 */
555 queue_work(ha->disco_q, &sw->work);
556}
557
558static void sas_chain_event(int event, unsigned long *pending,
559 struct sas_work *sw,
560 struct sas_ha_struct *ha)
561{
562 if (!test_and_set_bit(event, pending)) {
563 unsigned long flags;
564
565 spin_lock_irqsave(&ha->lock, flags);
566 sas_chain_work(ha, sw);
567 spin_unlock_irqrestore(&ha->lock, flags);
568 }
569}
570
571void sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
572{
573 struct sas_discovery *disc;
574
575 if (!port)
576 return;
577 disc = &port->disc;
578
579 BUG_ON(ev >= DISC_NUM_EVENTS);
580
581 sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
582}
583
584/**
585 * sas_init_disc - initialize the discovery struct in the port
586 * @disc: port discovery structure
587 * @port: pointer to struct port
588 *
589 * Called when the ports are being initialized.
590 */
591void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
592{
593 int i;
594
595 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
596 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
597 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
598 [DISCE_SUSPEND] = sas_suspend_devices,
599 [DISCE_RESUME] = sas_resume_devices,
600 };
601
602 disc->pending = 0;
603 for (i = 0; i < DISC_NUM_EVENTS; i++) {
604 INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
605 disc->disc_work[i].port = port;
606 }
607}
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 <linux/async.h>
28#include <scsi/scsi_host.h>
29#include <scsi/scsi_eh.h>
30#include "sas_internal.h"
31
32#include <scsi/scsi_transport.h>
33#include <scsi/scsi_transport_sas.h>
34#include <scsi/sas_ata.h>
35#include "../scsi_sas_internal.h"
36
37/* ---------- Basic task processing for discovery purposes ---------- */
38
39void sas_init_dev(struct domain_device *dev)
40{
41 switch (dev->dev_type) {
42 case SAS_END_DEVICE:
43 INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
44 break;
45 case SAS_EDGE_EXPANDER_DEVICE:
46 case SAS_FANOUT_EXPANDER_DEVICE:
47 INIT_LIST_HEAD(&dev->ex_dev.children);
48 mutex_init(&dev->ex_dev.cmd_mutex);
49 break;
50 default:
51 break;
52 }
53}
54
55/* ---------- Domain device discovery ---------- */
56
57/**
58 * sas_get_port_device -- Discover devices which caused port creation
59 * @port: pointer to struct sas_port of interest
60 *
61 * Devices directly attached to a HA port, have no parent. This is
62 * how we know they are (domain) "root" devices. All other devices
63 * do, and should have their "parent" pointer set appropriately as
64 * soon as a child device is discovered.
65 */
66static int sas_get_port_device(struct asd_sas_port *port)
67{
68 struct asd_sas_phy *phy;
69 struct sas_rphy *rphy;
70 struct domain_device *dev;
71 int rc = -ENODEV;
72
73 dev = sas_alloc_device();
74 if (!dev)
75 return -ENOMEM;
76
77 spin_lock_irq(&port->phy_list_lock);
78 if (list_empty(&port->phy_list)) {
79 spin_unlock_irq(&port->phy_list_lock);
80 sas_put_device(dev);
81 return -ENODEV;
82 }
83 phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
84 spin_lock(&phy->frame_rcvd_lock);
85 memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
86 (size_t)phy->frame_rcvd_size));
87 spin_unlock(&phy->frame_rcvd_lock);
88 spin_unlock_irq(&port->phy_list_lock);
89
90 if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
91 struct dev_to_host_fis *fis =
92 (struct dev_to_host_fis *) dev->frame_rcvd;
93 if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
94 fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
95 && (fis->device & ~0x10) == 0)
96 dev->dev_type = SAS_SATA_PM;
97 else
98 dev->dev_type = SAS_SATA_DEV;
99 dev->tproto = SAS_PROTOCOL_SATA;
100 } else {
101 struct sas_identify_frame *id =
102 (struct sas_identify_frame *) dev->frame_rcvd;
103 dev->dev_type = id->dev_type;
104 dev->iproto = id->initiator_bits;
105 dev->tproto = id->target_bits;
106 }
107
108 sas_init_dev(dev);
109
110 dev->port = port;
111 switch (dev->dev_type) {
112 case SAS_SATA_DEV:
113 rc = sas_ata_init(dev);
114 if (rc) {
115 rphy = NULL;
116 break;
117 }
118 /* fall through */
119 case SAS_END_DEVICE:
120 rphy = sas_end_device_alloc(port->port);
121 break;
122 case SAS_EDGE_EXPANDER_DEVICE:
123 rphy = sas_expander_alloc(port->port,
124 SAS_EDGE_EXPANDER_DEVICE);
125 break;
126 case SAS_FANOUT_EXPANDER_DEVICE:
127 rphy = sas_expander_alloc(port->port,
128 SAS_FANOUT_EXPANDER_DEVICE);
129 break;
130 default:
131 printk("ERROR: Unidentified device type %d\n", dev->dev_type);
132 rphy = NULL;
133 break;
134 }
135
136 if (!rphy) {
137 sas_put_device(dev);
138 return rc;
139 }
140
141 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
142 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
143 sas_fill_in_rphy(dev, rphy);
144 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
145 port->port_dev = dev;
146 dev->linkrate = port->linkrate;
147 dev->min_linkrate = port->linkrate;
148 dev->max_linkrate = port->linkrate;
149 dev->pathways = port->num_phys;
150 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
151 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
152 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
153 port->disc.max_level = 0;
154 sas_device_set_phy(dev, port->port);
155
156 dev->rphy = rphy;
157 get_device(&dev->rphy->dev);
158
159 if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE)
160 list_add_tail(&dev->disco_list_node, &port->disco_list);
161 else {
162 spin_lock_irq(&port->dev_list_lock);
163 list_add_tail(&dev->dev_list_node, &port->dev_list);
164 spin_unlock_irq(&port->dev_list_lock);
165 }
166
167 spin_lock_irq(&port->phy_list_lock);
168 list_for_each_entry(phy, &port->phy_list, port_phy_el)
169 sas_phy_set_target(phy, dev);
170 spin_unlock_irq(&port->phy_list_lock);
171
172 return 0;
173}
174
175/* ---------- Discover and Revalidate ---------- */
176
177int sas_notify_lldd_dev_found(struct domain_device *dev)
178{
179 int res = 0;
180 struct sas_ha_struct *sas_ha = dev->port->ha;
181 struct Scsi_Host *shost = sas_ha->core.shost;
182 struct sas_internal *i = to_sas_internal(shost->transportt);
183
184 if (!i->dft->lldd_dev_found)
185 return 0;
186
187 res = i->dft->lldd_dev_found(dev);
188 if (res) {
189 printk("sas: driver on pcidev %s cannot handle "
190 "device %llx, error:%d\n",
191 dev_name(sas_ha->dev),
192 SAS_ADDR(dev->sas_addr), res);
193 }
194 set_bit(SAS_DEV_FOUND, &dev->state);
195 kref_get(&dev->kref);
196 return res;
197}
198
199
200void sas_notify_lldd_dev_gone(struct domain_device *dev)
201{
202 struct sas_ha_struct *sas_ha = dev->port->ha;
203 struct Scsi_Host *shost = sas_ha->core.shost;
204 struct sas_internal *i = to_sas_internal(shost->transportt);
205
206 if (!i->dft->lldd_dev_gone)
207 return;
208
209 if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
210 i->dft->lldd_dev_gone(dev);
211 sas_put_device(dev);
212 }
213}
214
215static void sas_probe_devices(struct work_struct *work)
216{
217 struct domain_device *dev, *n;
218 struct sas_discovery_event *ev = to_sas_discovery_event(work);
219 struct asd_sas_port *port = ev->port;
220
221 clear_bit(DISCE_PROBE, &port->disc.pending);
222
223 /* devices must be domain members before link recovery and probe */
224 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
225 spin_lock_irq(&port->dev_list_lock);
226 list_add_tail(&dev->dev_list_node, &port->dev_list);
227 spin_unlock_irq(&port->dev_list_lock);
228 }
229
230 sas_probe_sata(port);
231
232 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
233 int err;
234
235 err = sas_rphy_add(dev->rphy);
236 if (err)
237 sas_fail_probe(dev, __func__, err);
238 else
239 list_del_init(&dev->disco_list_node);
240 }
241}
242
243static void sas_suspend_devices(struct work_struct *work)
244{
245 struct asd_sas_phy *phy;
246 struct domain_device *dev;
247 struct sas_discovery_event *ev = to_sas_discovery_event(work);
248 struct asd_sas_port *port = ev->port;
249 struct Scsi_Host *shost = port->ha->core.shost;
250 struct sas_internal *si = to_sas_internal(shost->transportt);
251
252 clear_bit(DISCE_SUSPEND, &port->disc.pending);
253
254 sas_suspend_sata(port);
255
256 /* lldd is free to forget the domain_device across the
257 * suspension, we force the issue here to keep the reference
258 * counts aligned
259 */
260 list_for_each_entry(dev, &port->dev_list, dev_list_node)
261 sas_notify_lldd_dev_gone(dev);
262
263 /* we are suspending, so we know events are disabled and
264 * phy_list is not being mutated
265 */
266 list_for_each_entry(phy, &port->phy_list, port_phy_el) {
267 if (si->dft->lldd_port_formed)
268 si->dft->lldd_port_deformed(phy);
269 phy->suspended = 1;
270 port->suspended = 1;
271 }
272}
273
274static void sas_resume_devices(struct work_struct *work)
275{
276 struct sas_discovery_event *ev = to_sas_discovery_event(work);
277 struct asd_sas_port *port = ev->port;
278
279 clear_bit(DISCE_RESUME, &port->disc.pending);
280
281 sas_resume_sata(port);
282}
283
284/**
285 * sas_discover_end_dev -- discover an end device (SSP, etc)
286 * @end: pointer to domain device of interest
287 *
288 * See comment in sas_discover_sata().
289 */
290int sas_discover_end_dev(struct domain_device *dev)
291{
292 int res;
293
294 res = sas_notify_lldd_dev_found(dev);
295 if (res)
296 return res;
297 sas_discover_event(dev->port, DISCE_PROBE);
298
299 return 0;
300}
301
302/* ---------- Device registration and unregistration ---------- */
303
304void sas_free_device(struct kref *kref)
305{
306 struct domain_device *dev = container_of(kref, typeof(*dev), kref);
307
308 put_device(&dev->rphy->dev);
309 dev->rphy = NULL;
310
311 if (dev->parent)
312 sas_put_device(dev->parent);
313
314 sas_port_put_phy(dev->phy);
315 dev->phy = NULL;
316
317 /* remove the phys and ports, everything else should be gone */
318 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
319 kfree(dev->ex_dev.ex_phy);
320
321 if (dev_is_sata(dev) && dev->sata_dev.ap) {
322 ata_sas_port_destroy(dev->sata_dev.ap);
323 dev->sata_dev.ap = NULL;
324 }
325
326 kfree(dev);
327}
328
329static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
330{
331 struct sas_ha_struct *ha = port->ha;
332
333 sas_notify_lldd_dev_gone(dev);
334 if (!dev->parent)
335 dev->port->port_dev = NULL;
336 else
337 list_del_init(&dev->siblings);
338
339 spin_lock_irq(&port->dev_list_lock);
340 list_del_init(&dev->dev_list_node);
341 if (dev_is_sata(dev))
342 sas_ata_end_eh(dev->sata_dev.ap);
343 spin_unlock_irq(&port->dev_list_lock);
344
345 spin_lock_irq(&ha->lock);
346 if (dev->dev_type == SAS_END_DEVICE &&
347 !list_empty(&dev->ssp_dev.eh_list_node)) {
348 list_del_init(&dev->ssp_dev.eh_list_node);
349 ha->eh_active--;
350 }
351 spin_unlock_irq(&ha->lock);
352
353 sas_put_device(dev);
354}
355
356static void sas_destruct_devices(struct work_struct *work)
357{
358 struct domain_device *dev, *n;
359 struct sas_discovery_event *ev = to_sas_discovery_event(work);
360 struct asd_sas_port *port = ev->port;
361
362 clear_bit(DISCE_DESTRUCT, &port->disc.pending);
363
364 list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
365 list_del_init(&dev->disco_list_node);
366
367 sas_remove_children(&dev->rphy->dev);
368 sas_rphy_delete(dev->rphy);
369 sas_unregister_common_dev(port, dev);
370 }
371}
372
373void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
374{
375 if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
376 !list_empty(&dev->disco_list_node)) {
377 /* this rphy never saw sas_rphy_add */
378 list_del_init(&dev->disco_list_node);
379 sas_rphy_free(dev->rphy);
380 sas_unregister_common_dev(port, dev);
381 return;
382 }
383
384 if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
385 sas_rphy_unlink(dev->rphy);
386 list_move_tail(&dev->disco_list_node, &port->destroy_list);
387 sas_discover_event(dev->port, DISCE_DESTRUCT);
388 }
389}
390
391void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
392{
393 struct domain_device *dev, *n;
394
395 list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
396 if (gone)
397 set_bit(SAS_DEV_GONE, &dev->state);
398 sas_unregister_dev(port, dev);
399 }
400
401 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
402 sas_unregister_dev(port, dev);
403
404 port->port->rphy = NULL;
405
406}
407
408void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
409{
410 struct sas_ha_struct *ha;
411 struct sas_phy *new_phy;
412
413 if (!dev)
414 return;
415
416 ha = dev->port->ha;
417 new_phy = sas_port_get_phy(port);
418
419 /* pin and record last seen phy */
420 spin_lock_irq(&ha->phy_port_lock);
421 if (new_phy) {
422 sas_port_put_phy(dev->phy);
423 dev->phy = new_phy;
424 }
425 spin_unlock_irq(&ha->phy_port_lock);
426}
427
428/* ---------- Discovery and Revalidation ---------- */
429
430/**
431 * sas_discover_domain -- discover the domain
432 * @port: port to the domain of interest
433 *
434 * NOTE: this process _must_ quit (return) as soon as any connection
435 * errors are encountered. Connection recovery is done elsewhere.
436 * Discover process only interrogates devices in order to discover the
437 * domain.
438 */
439static void sas_discover_domain(struct work_struct *work)
440{
441 struct domain_device *dev;
442 int error = 0;
443 struct sas_discovery_event *ev = to_sas_discovery_event(work);
444 struct asd_sas_port *port = ev->port;
445
446 clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
447
448 if (port->port_dev)
449 return;
450
451 error = sas_get_port_device(port);
452 if (error)
453 return;
454 dev = port->port_dev;
455
456 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
457 task_pid_nr(current));
458
459 switch (dev->dev_type) {
460 case SAS_END_DEVICE:
461 error = sas_discover_end_dev(dev);
462 break;
463 case SAS_EDGE_EXPANDER_DEVICE:
464 case SAS_FANOUT_EXPANDER_DEVICE:
465 error = sas_discover_root_expander(dev);
466 break;
467 case SAS_SATA_DEV:
468 case SAS_SATA_PM:
469#ifdef CONFIG_SCSI_SAS_ATA
470 error = sas_discover_sata(dev);
471 break;
472#else
473 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
474 /* Fall through */
475#endif
476 default:
477 error = -ENXIO;
478 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
479 break;
480 }
481
482 if (error) {
483 sas_rphy_free(dev->rphy);
484 list_del_init(&dev->disco_list_node);
485 spin_lock_irq(&port->dev_list_lock);
486 list_del_init(&dev->dev_list_node);
487 spin_unlock_irq(&port->dev_list_lock);
488
489 sas_put_device(dev);
490 port->port_dev = NULL;
491 }
492
493 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
494 task_pid_nr(current), error);
495}
496
497static void sas_revalidate_domain(struct work_struct *work)
498{
499 int res = 0;
500 struct sas_discovery_event *ev = to_sas_discovery_event(work);
501 struct asd_sas_port *port = ev->port;
502 struct sas_ha_struct *ha = port->ha;
503 struct domain_device *ddev = port->port_dev;
504
505 /* prevent revalidation from finding sata links in recovery */
506 mutex_lock(&ha->disco_mutex);
507 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
508 SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
509 port->id, task_pid_nr(current));
510 goto out;
511 }
512
513 clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
514
515 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
516 task_pid_nr(current));
517
518 if (ddev && (ddev->dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
519 ddev->dev_type == SAS_EDGE_EXPANDER_DEVICE))
520 res = sas_ex_revalidate_domain(ddev);
521
522 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
523 port->id, task_pid_nr(current), res);
524 out:
525 mutex_unlock(&ha->disco_mutex);
526}
527
528/* ---------- Events ---------- */
529
530static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
531{
532 /* chained work is not subject to SA_HA_DRAINING or
533 * SAS_HA_REGISTERED, because it is either submitted in the
534 * workqueue, or known to be submitted from a context that is
535 * not racing against draining
536 */
537 scsi_queue_work(ha->core.shost, &sw->work);
538}
539
540static void sas_chain_event(int event, unsigned long *pending,
541 struct sas_work *sw,
542 struct sas_ha_struct *ha)
543{
544 if (!test_and_set_bit(event, pending)) {
545 unsigned long flags;
546
547 spin_lock_irqsave(&ha->lock, flags);
548 sas_chain_work(ha, sw);
549 spin_unlock_irqrestore(&ha->lock, flags);
550 }
551}
552
553int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
554{
555 struct sas_discovery *disc;
556
557 if (!port)
558 return 0;
559 disc = &port->disc;
560
561 BUG_ON(ev >= DISC_NUM_EVENTS);
562
563 sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
564
565 return 0;
566}
567
568/**
569 * sas_init_disc -- initialize the discovery struct in the port
570 * @port: pointer to struct port
571 *
572 * Called when the ports are being initialized.
573 */
574void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
575{
576 int i;
577
578 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
579 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
580 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
581 [DISCE_PROBE] = sas_probe_devices,
582 [DISCE_SUSPEND] = sas_suspend_devices,
583 [DISCE_RESUME] = sas_resume_devices,
584 [DISCE_DESTRUCT] = sas_destruct_devices,
585 };
586
587 disc->pending = 0;
588 for (i = 0; i < DISC_NUM_EVENTS; i++) {
589 INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
590 disc->disc_work[i].port = port;
591 }
592}