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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 <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 asd_sas_port *port)
216{
217 struct domain_device *dev, *n;
218
219 /* devices must be domain members before link recovery and probe */
220 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
221 spin_lock_irq(&port->dev_list_lock);
222 list_add_tail(&dev->dev_list_node, &port->dev_list);
223 spin_unlock_irq(&port->dev_list_lock);
224 }
225
226 sas_probe_sata(port);
227
228 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
229 int err;
230
231 err = sas_rphy_add(dev->rphy);
232 if (err)
233 sas_fail_probe(dev, __func__, err);
234 else
235 list_del_init(&dev->disco_list_node);
236 }
237}
238
239static void sas_suspend_devices(struct work_struct *work)
240{
241 struct asd_sas_phy *phy;
242 struct domain_device *dev;
243 struct sas_discovery_event *ev = to_sas_discovery_event(work);
244 struct asd_sas_port *port = ev->port;
245 struct Scsi_Host *shost = port->ha->core.shost;
246 struct sas_internal *si = to_sas_internal(shost->transportt);
247
248 clear_bit(DISCE_SUSPEND, &port->disc.pending);
249
250 sas_suspend_sata(port);
251
252 /* lldd is free to forget the domain_device across the
253 * suspension, we force the issue here to keep the reference
254 * counts aligned
255 */
256 list_for_each_entry(dev, &port->dev_list, dev_list_node)
257 sas_notify_lldd_dev_gone(dev);
258
259 /* we are suspending, so we know events are disabled and
260 * phy_list is not being mutated
261 */
262 list_for_each_entry(phy, &port->phy_list, port_phy_el) {
263 if (si->dft->lldd_port_formed)
264 si->dft->lldd_port_deformed(phy);
265 phy->suspended = 1;
266 port->suspended = 1;
267 }
268}
269
270static void sas_resume_devices(struct work_struct *work)
271{
272 struct sas_discovery_event *ev = to_sas_discovery_event(work);
273 struct asd_sas_port *port = ev->port;
274
275 clear_bit(DISCE_RESUME, &port->disc.pending);
276
277 sas_resume_sata(port);
278}
279
280/**
281 * sas_discover_end_dev - discover an end device (SSP, etc)
282 * @dev: pointer to domain device of interest
283 *
284 * See comment in sas_discover_sata().
285 */
286int sas_discover_end_dev(struct domain_device *dev)
287{
288 int res;
289
290 res = sas_notify_lldd_dev_found(dev);
291 if (res)
292 return res;
293
294 return 0;
295}
296
297/* ---------- Device registration and unregistration ---------- */
298
299void sas_free_device(struct kref *kref)
300{
301 struct domain_device *dev = container_of(kref, typeof(*dev), kref);
302
303 put_device(&dev->rphy->dev);
304 dev->rphy = NULL;
305
306 if (dev->parent)
307 sas_put_device(dev->parent);
308
309 sas_port_put_phy(dev->phy);
310 dev->phy = NULL;
311
312 /* remove the phys and ports, everything else should be gone */
313 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
314 kfree(dev->ex_dev.ex_phy);
315
316 if (dev_is_sata(dev) && dev->sata_dev.ap) {
317 ata_sas_port_destroy(dev->sata_dev.ap);
318 dev->sata_dev.ap = NULL;
319 }
320
321 kfree(dev);
322}
323
324static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
325{
326 struct sas_ha_struct *ha = port->ha;
327
328 sas_notify_lldd_dev_gone(dev);
329 if (!dev->parent)
330 dev->port->port_dev = NULL;
331 else
332 list_del_init(&dev->siblings);
333
334 spin_lock_irq(&port->dev_list_lock);
335 list_del_init(&dev->dev_list_node);
336 if (dev_is_sata(dev))
337 sas_ata_end_eh(dev->sata_dev.ap);
338 spin_unlock_irq(&port->dev_list_lock);
339
340 spin_lock_irq(&ha->lock);
341 if (dev->dev_type == SAS_END_DEVICE &&
342 !list_empty(&dev->ssp_dev.eh_list_node)) {
343 list_del_init(&dev->ssp_dev.eh_list_node);
344 ha->eh_active--;
345 }
346 spin_unlock_irq(&ha->lock);
347
348 sas_put_device(dev);
349}
350
351void sas_destruct_devices(struct asd_sas_port *port)
352{
353 struct domain_device *dev, *n;
354
355 list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
356 list_del_init(&dev->disco_list_node);
357
358 sas_remove_children(&dev->rphy->dev);
359 sas_rphy_delete(dev->rphy);
360 sas_unregister_common_dev(port, dev);
361 }
362}
363
364static void sas_destruct_ports(struct asd_sas_port *port)
365{
366 struct sas_port *sas_port, *p;
367
368 list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
369 list_del_init(&sas_port->del_list);
370 sas_port_delete(sas_port);
371 }
372}
373
374void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
375{
376 if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
377 !list_empty(&dev->disco_list_node)) {
378 /* this rphy never saw sas_rphy_add */
379 list_del_init(&dev->disco_list_node);
380 sas_rphy_free(dev->rphy);
381 sas_unregister_common_dev(port, dev);
382 return;
383 }
384
385 if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
386 sas_rphy_unlink(dev->rphy);
387 list_move_tail(&dev->disco_list_node, &port->destroy_list);
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 * @work: work structure embedded in port domain device.
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_probe_devices(port);
494
495 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
496 task_pid_nr(current), error);
497}
498
499static void sas_revalidate_domain(struct work_struct *work)
500{
501 int res = 0;
502 struct sas_discovery_event *ev = to_sas_discovery_event(work);
503 struct asd_sas_port *port = ev->port;
504 struct sas_ha_struct *ha = port->ha;
505 struct domain_device *ddev = port->port_dev;
506
507 /* prevent revalidation from finding sata links in recovery */
508 mutex_lock(&ha->disco_mutex);
509 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
510 SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
511 port->id, task_pid_nr(current));
512 goto out;
513 }
514
515 clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
516
517 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
518 task_pid_nr(current));
519
520 if (ddev && (ddev->dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
521 ddev->dev_type == SAS_EDGE_EXPANDER_DEVICE))
522 res = sas_ex_revalidate_domain(ddev);
523
524 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
525 port->id, task_pid_nr(current), res);
526 out:
527 mutex_unlock(&ha->disco_mutex);
528
529 sas_destruct_devices(port);
530 sas_destruct_ports(port);
531 sas_probe_devices(port);
532}
533
534/* ---------- Events ---------- */
535
536static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
537{
538 /* chained work is not subject to SA_HA_DRAINING or
539 * SAS_HA_REGISTERED, because it is either submitted in the
540 * workqueue, or known to be submitted from a context that is
541 * not racing against draining
542 */
543 queue_work(ha->disco_q, &sw->work);
544}
545
546static void sas_chain_event(int event, unsigned long *pending,
547 struct sas_work *sw,
548 struct sas_ha_struct *ha)
549{
550 if (!test_and_set_bit(event, pending)) {
551 unsigned long flags;
552
553 spin_lock_irqsave(&ha->lock, flags);
554 sas_chain_work(ha, sw);
555 spin_unlock_irqrestore(&ha->lock, flags);
556 }
557}
558
559int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
560{
561 struct sas_discovery *disc;
562
563 if (!port)
564 return 0;
565 disc = &port->disc;
566
567 BUG_ON(ev >= DISC_NUM_EVENTS);
568
569 sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
570
571 return 0;
572}
573
574/**
575 * sas_init_disc - initialize the discovery struct in the port
576 * @disc: port discovery structure
577 * @port: pointer to struct port
578 *
579 * Called when the ports are being initialized.
580 */
581void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
582{
583 int i;
584
585 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
586 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
587 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
588 [DISCE_SUSPEND] = sas_suspend_devices,
589 [DISCE_RESUME] = sas_resume_devices,
590 };
591
592 disc->pending = 0;
593 for (i = 0; i < DISC_NUM_EVENTS; i++) {
594 INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
595 disc->disc_work[i].port = port;
596 }
597}
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}