2 * Serial Attached SCSI (SAS) Discover process
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 * This file is licensed under GPLv2.
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.
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.
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
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"
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"
36 /* ---------- Basic task processing for discovery purposes ---------- */
38 void sas_init_dev(struct domain_device
*dev
)
40 switch (dev
->dev_type
) {
45 INIT_LIST_HEAD(&dev
->ex_dev
.children
);
46 mutex_init(&dev
->ex_dev
.cmd_mutex
);
52 INIT_LIST_HEAD(&dev
->sata_dev
.children
);
59 /* ---------- Domain device discovery ---------- */
62 * sas_get_port_device -- Discover devices which caused port creation
63 * @port: pointer to struct sas_port of interest
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.
70 static int sas_get_port_device(struct asd_sas_port
*port
)
72 struct asd_sas_phy
*phy
;
73 struct sas_rphy
*rphy
;
74 struct domain_device
*dev
;
76 dev
= sas_alloc_device();
80 spin_lock_irq(&port
->phy_list_lock
);
81 if (list_empty(&port
->phy_list
)) {
82 spin_unlock_irq(&port
->phy_list_lock
);
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_irq(&port
->phy_list_lock
);
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
;
101 dev
->dev_type
= SATA_DEV
;
102 dev
->tproto
= SAS_PROTOCOL_SATA
;
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
;
113 switch (dev
->dev_type
) {
116 rphy
= sas_end_device_alloc(port
->port
);
119 rphy
= sas_expander_alloc(port
->port
,
120 SAS_EDGE_EXPANDER_DEVICE
);
123 rphy
= sas_expander_alloc(port
->port
,
124 SAS_FANOUT_EXPANDER_DEVICE
);
127 printk("ERROR: Unidentified device type %d\n", dev
->dev_type
);
137 rphy
->identify
.phy_identifier
= phy
->phy
->identify
.phy_identifier
;
138 memcpy(dev
->sas_addr
, port
->attached_sas_addr
, SAS_ADDR_SIZE
);
139 sas_fill_in_rphy(dev
, rphy
);
140 sas_hash_addr(dev
->hashed_sas_addr
, dev
->sas_addr
);
141 port
->port_dev
= dev
;
143 dev
->linkrate
= port
->linkrate
;
144 dev
->min_linkrate
= port
->linkrate
;
145 dev
->max_linkrate
= port
->linkrate
;
146 dev
->pathways
= port
->num_phys
;
147 memset(port
->disc
.fanout_sas_addr
, 0, SAS_ADDR_SIZE
);
148 memset(port
->disc
.eeds_a
, 0, SAS_ADDR_SIZE
);
149 memset(port
->disc
.eeds_b
, 0, SAS_ADDR_SIZE
);
150 port
->disc
.max_level
= 0;
151 sas_device_set_phy(dev
, port
->port
);
154 get_device(&dev
->rphy
->dev
);
156 if (dev_is_sata(dev
) || dev
->dev_type
== SAS_END_DEV
)
157 list_add_tail(&dev
->disco_list_node
, &port
->disco_list
);
159 spin_lock_irq(&port
->dev_list_lock
);
160 list_add_tail(&dev
->dev_list_node
, &port
->dev_list
);
161 spin_unlock_irq(&port
->dev_list_lock
);
164 spin_lock_irq(&port
->phy_list_lock
);
165 list_for_each_entry(phy
, &port
->phy_list
, port_phy_el
)
166 sas_phy_set_target(phy
, dev
);
167 spin_unlock_irq(&port
->phy_list_lock
);
172 /* ---------- Discover and Revalidate ---------- */
174 int sas_notify_lldd_dev_found(struct domain_device
*dev
)
177 struct sas_ha_struct
*sas_ha
= dev
->port
->ha
;
178 struct Scsi_Host
*shost
= sas_ha
->core
.shost
;
179 struct sas_internal
*i
= to_sas_internal(shost
->transportt
);
181 if (i
->dft
->lldd_dev_found
) {
182 res
= i
->dft
->lldd_dev_found(dev
);
184 printk("sas: driver on pcidev %s cannot handle "
185 "device %llx, error:%d\n",
186 dev_name(sas_ha
->dev
),
187 SAS_ADDR(dev
->sas_addr
), res
);
189 kref_get(&dev
->kref
);
195 void sas_notify_lldd_dev_gone(struct domain_device
*dev
)
197 struct sas_ha_struct
*sas_ha
= dev
->port
->ha
;
198 struct Scsi_Host
*shost
= sas_ha
->core
.shost
;
199 struct sas_internal
*i
= to_sas_internal(shost
->transportt
);
201 if (i
->dft
->lldd_dev_gone
) {
202 i
->dft
->lldd_dev_gone(dev
);
207 static void sas_probe_devices(struct work_struct
*work
)
209 struct domain_device
*dev
, *n
;
210 struct sas_discovery_event
*ev
= to_sas_discovery_event(work
);
211 struct asd_sas_port
*port
= ev
->port
;
213 clear_bit(DISCE_PROBE
, &port
->disc
.pending
);
215 /* devices must be domain members before link recovery and probe */
216 list_for_each_entry(dev
, &port
->disco_list
, disco_list_node
) {
217 spin_lock_irq(&port
->dev_list_lock
);
218 list_add_tail(&dev
->dev_list_node
, &port
->dev_list
);
219 spin_unlock_irq(&port
->dev_list_lock
);
222 sas_probe_sata(port
);
224 list_for_each_entry_safe(dev
, n
, &port
->disco_list
, disco_list_node
) {
227 err
= sas_rphy_add(dev
->rphy
);
229 sas_fail_probe(dev
, __func__
, err
);
231 list_del_init(&dev
->disco_list_node
);
236 * sas_discover_end_dev -- discover an end device (SSP, etc)
237 * @end: pointer to domain device of interest
239 * See comment in sas_discover_sata().
241 int sas_discover_end_dev(struct domain_device
*dev
)
245 res
= sas_notify_lldd_dev_found(dev
);
248 sas_discover_event(dev
->port
, DISCE_PROBE
);
253 /* ---------- Device registration and unregistration ---------- */
255 void sas_free_device(struct kref
*kref
)
257 struct domain_device
*dev
= container_of(kref
, typeof(*dev
), kref
);
259 put_device(&dev
->rphy
->dev
);
263 sas_put_device(dev
->parent
);
265 sas_port_put_phy(dev
->phy
);
268 /* remove the phys and ports, everything else should be gone */
269 if (dev
->dev_type
== EDGE_DEV
|| dev
->dev_type
== FANOUT_DEV
)
270 kfree(dev
->ex_dev
.ex_phy
);
272 if (dev_is_sata(dev
) && dev
->sata_dev
.ap
) {
273 ata_sas_port_destroy(dev
->sata_dev
.ap
);
274 dev
->sata_dev
.ap
= NULL
;
280 static void sas_unregister_common_dev(struct asd_sas_port
*port
, struct domain_device
*dev
)
282 sas_notify_lldd_dev_gone(dev
);
284 dev
->port
->port_dev
= NULL
;
286 list_del_init(&dev
->siblings
);
288 spin_lock_irq(&port
->dev_list_lock
);
289 list_del_init(&dev
->dev_list_node
);
290 spin_unlock_irq(&port
->dev_list_lock
);
295 static void sas_destruct_devices(struct work_struct
*work
)
297 struct domain_device
*dev
, *n
;
298 struct sas_discovery_event
*ev
= to_sas_discovery_event(work
);
299 struct asd_sas_port
*port
= ev
->port
;
301 clear_bit(DISCE_DESTRUCT
, &port
->disc
.pending
);
303 list_for_each_entry_safe(dev
, n
, &port
->destroy_list
, disco_list_node
) {
304 list_del_init(&dev
->disco_list_node
);
306 sas_remove_children(&dev
->rphy
->dev
);
307 sas_rphy_delete(dev
->rphy
);
308 sas_unregister_common_dev(port
, dev
);
312 void sas_unregister_dev(struct asd_sas_port
*port
, struct domain_device
*dev
)
314 if (!test_bit(SAS_DEV_DESTROY
, &dev
->state
) &&
315 !list_empty(&dev
->disco_list_node
)) {
316 /* this rphy never saw sas_rphy_add */
317 list_del_init(&dev
->disco_list_node
);
318 sas_rphy_free(dev
->rphy
);
319 sas_unregister_common_dev(port
, dev
);
323 if (!test_and_set_bit(SAS_DEV_DESTROY
, &dev
->state
)) {
324 sas_rphy_unlink(dev
->rphy
);
325 list_move_tail(&dev
->disco_list_node
, &port
->destroy_list
);
326 sas_discover_event(dev
->port
, DISCE_DESTRUCT
);
330 void sas_unregister_domain_devices(struct asd_sas_port
*port
, int gone
)
332 struct domain_device
*dev
, *n
;
334 list_for_each_entry_safe_reverse(dev
, n
, &port
->dev_list
, dev_list_node
) {
336 set_bit(SAS_DEV_GONE
, &dev
->state
);
337 sas_unregister_dev(port
, dev
);
340 list_for_each_entry_safe(dev
, n
, &port
->disco_list
, disco_list_node
)
341 sas_unregister_dev(port
, dev
);
343 port
->port
->rphy
= NULL
;
347 void sas_device_set_phy(struct domain_device
*dev
, struct sas_port
*port
)
349 struct sas_ha_struct
*ha
;
350 struct sas_phy
*new_phy
;
356 new_phy
= sas_port_get_phy(port
);
358 /* pin and record last seen phy */
359 spin_lock_irq(&ha
->phy_port_lock
);
361 sas_port_put_phy(dev
->phy
);
364 spin_unlock_irq(&ha
->phy_port_lock
);
367 /* ---------- Discovery and Revalidation ---------- */
370 * sas_discover_domain -- discover the domain
371 * @port: port to the domain of interest
373 * NOTE: this process _must_ quit (return) as soon as any connection
374 * errors are encountered. Connection recovery is done elsewhere.
375 * Discover process only interrogates devices in order to discover the
378 static void sas_discover_domain(struct work_struct
*work
)
380 struct domain_device
*dev
;
382 struct sas_discovery_event
*ev
= to_sas_discovery_event(work
);
383 struct asd_sas_port
*port
= ev
->port
;
385 clear_bit(DISCE_DISCOVER_DOMAIN
, &port
->disc
.pending
);
390 error
= sas_get_port_device(port
);
393 dev
= port
->port_dev
;
395 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port
->id
,
396 task_pid_nr(current
));
398 switch (dev
->dev_type
) {
400 error
= sas_discover_end_dev(dev
);
404 error
= sas_discover_root_expander(dev
);
408 #ifdef CONFIG_SCSI_SAS_ATA
409 error
= sas_discover_sata(dev
);
412 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
417 SAS_DPRINTK("unhandled device %d\n", dev
->dev_type
);
422 sas_rphy_free(dev
->rphy
);
423 list_del_init(&dev
->disco_list_node
);
424 spin_lock_irq(&port
->dev_list_lock
);
425 list_del_init(&dev
->dev_list_node
);
426 spin_unlock_irq(&port
->dev_list_lock
);
429 port
->port_dev
= NULL
;
432 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port
->id
,
433 task_pid_nr(current
), error
);
436 static void sas_revalidate_domain(struct work_struct
*work
)
439 struct sas_discovery_event
*ev
= to_sas_discovery_event(work
);
440 struct asd_sas_port
*port
= ev
->port
;
441 struct sas_ha_struct
*ha
= port
->ha
;
443 /* prevent revalidation from finding sata links in recovery */
444 mutex_lock(&ha
->disco_mutex
);
445 if (test_bit(SAS_HA_ATA_EH_ACTIVE
, &ha
->state
)) {
446 SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
447 port
->id
, task_pid_nr(current
));
451 clear_bit(DISCE_REVALIDATE_DOMAIN
, &port
->disc
.pending
);
453 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port
->id
,
454 task_pid_nr(current
));
457 res
= sas_ex_revalidate_domain(port
->port_dev
);
459 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
460 port
->id
, task_pid_nr(current
), res
);
462 mutex_unlock(&ha
->disco_mutex
);
465 /* ---------- Events ---------- */
467 static void sas_chain_work(struct sas_ha_struct
*ha
, struct sas_work
*sw
)
469 /* chained work is not subject to SA_HA_DRAINING or
470 * SAS_HA_REGISTERED, because it is either submitted in the
471 * workqueue, or known to be submitted from a context that is
472 * not racing against draining
474 scsi_queue_work(ha
->core
.shost
, &sw
->work
);
477 static void sas_chain_event(int event
, unsigned long *pending
,
479 struct sas_ha_struct
*ha
)
481 if (!test_and_set_bit(event
, pending
)) {
484 spin_lock_irqsave(&ha
->state_lock
, flags
);
485 sas_chain_work(ha
, sw
);
486 spin_unlock_irqrestore(&ha
->state_lock
, flags
);
490 int sas_discover_event(struct asd_sas_port
*port
, enum discover_event ev
)
492 struct sas_discovery
*disc
;
498 BUG_ON(ev
>= DISC_NUM_EVENTS
);
500 sas_chain_event(ev
, &disc
->pending
, &disc
->disc_work
[ev
].work
, port
->ha
);
506 * sas_init_disc -- initialize the discovery struct in the port
507 * @port: pointer to struct port
509 * Called when the ports are being initialized.
511 void sas_init_disc(struct sas_discovery
*disc
, struct asd_sas_port
*port
)
515 static const work_func_t sas_event_fns
[DISC_NUM_EVENTS
] = {
516 [DISCE_DISCOVER_DOMAIN
] = sas_discover_domain
,
517 [DISCE_REVALIDATE_DOMAIN
] = sas_revalidate_domain
,
518 [DISCE_PROBE
] = sas_probe_devices
,
519 [DISCE_DESTRUCT
] = sas_destruct_devices
,
523 for (i
= 0; i
< DISC_NUM_EVENTS
; i
++) {
524 INIT_SAS_WORK(&disc
->disc_work
[i
].work
, sas_event_fns
[i
]);
525 disc
->disc_work
[i
].port
= port
;