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
);
50 INIT_LIST_HEAD(&dev
->sata_dev
.children
);
57 /* ---------- Domain device discovery ---------- */
60 * sas_get_port_device -- Discover devices which caused port creation
61 * @port: pointer to struct sas_port of interest
63 * Devices directly attached to a HA port, have no parent. This is
64 * how we know they are (domain) "root" devices. All other devices
65 * do, and should have their "parent" pointer set appropriately as
66 * soon as a child device is discovered.
68 static int sas_get_port_device(struct asd_sas_port
*port
)
71 struct asd_sas_phy
*phy
;
72 struct sas_rphy
*rphy
;
73 struct domain_device
*dev
;
75 dev
= sas_alloc_device();
79 spin_lock_irqsave(&port
->phy_list_lock
, flags
);
80 if (list_empty(&port
->phy_list
)) {
81 spin_unlock_irqrestore(&port
->phy_list_lock
, flags
);
85 phy
= container_of(port
->phy_list
.next
, struct asd_sas_phy
, port_phy_el
);
86 spin_lock(&phy
->frame_rcvd_lock
);
87 memcpy(dev
->frame_rcvd
, phy
->frame_rcvd
, min(sizeof(dev
->frame_rcvd
),
88 (size_t)phy
->frame_rcvd_size
));
89 spin_unlock(&phy
->frame_rcvd_lock
);
90 spin_unlock_irqrestore(&port
->phy_list_lock
, flags
);
92 if (dev
->frame_rcvd
[0] == 0x34 && port
->oob_mode
== SATA_OOB_MODE
) {
93 struct dev_to_host_fis
*fis
=
94 (struct dev_to_host_fis
*) dev
->frame_rcvd
;
95 if (fis
->interrupt_reason
== 1 && fis
->lbal
== 1 &&
96 fis
->byte_count_low
==0x69 && fis
->byte_count_high
== 0x96
97 && (fis
->device
& ~0x10) == 0)
98 dev
->dev_type
= SATA_PM
;
100 dev
->dev_type
= SATA_DEV
;
101 dev
->tproto
= SAS_PROTOCOL_SATA
;
103 struct sas_identify_frame
*id
=
104 (struct sas_identify_frame
*) dev
->frame_rcvd
;
105 dev
->dev_type
= id
->dev_type
;
106 dev
->iproto
= id
->initiator_bits
;
107 dev
->tproto
= id
->target_bits
;
112 switch (dev
->dev_type
) {
115 rphy
= sas_end_device_alloc(port
->port
);
118 rphy
= sas_expander_alloc(port
->port
,
119 SAS_EDGE_EXPANDER_DEVICE
);
122 rphy
= sas_expander_alloc(port
->port
,
123 SAS_FANOUT_EXPANDER_DEVICE
);
126 printk("ERROR: Unidentified device type %d\n", dev
->dev_type
);
135 rphy
->identify
.phy_identifier
= phy
->phy
->identify
.phy_identifier
;
136 memcpy(dev
->sas_addr
, port
->attached_sas_addr
, SAS_ADDR_SIZE
);
137 sas_fill_in_rphy(dev
, rphy
);
138 sas_hash_addr(dev
->hashed_sas_addr
, dev
->sas_addr
);
139 port
->port_dev
= dev
;
141 dev
->linkrate
= port
->linkrate
;
142 dev
->min_linkrate
= port
->linkrate
;
143 dev
->max_linkrate
= port
->linkrate
;
144 dev
->pathways
= port
->num_phys
;
145 memset(port
->disc
.fanout_sas_addr
, 0, SAS_ADDR_SIZE
);
146 memset(port
->disc
.eeds_a
, 0, SAS_ADDR_SIZE
);
147 memset(port
->disc
.eeds_b
, 0, SAS_ADDR_SIZE
);
148 port
->disc
.max_level
= 0;
151 spin_lock_irq(&port
->dev_list_lock
);
152 list_add_tail(&dev
->dev_list_node
, &port
->dev_list
);
153 spin_unlock_irq(&port
->dev_list_lock
);
158 /* ---------- Discover and Revalidate ---------- */
160 int sas_notify_lldd_dev_found(struct domain_device
*dev
)
163 struct sas_ha_struct
*sas_ha
= dev
->port
->ha
;
164 struct Scsi_Host
*shost
= sas_ha
->core
.shost
;
165 struct sas_internal
*i
= to_sas_internal(shost
->transportt
);
167 if (i
->dft
->lldd_dev_found
) {
168 res
= i
->dft
->lldd_dev_found(dev
);
170 printk("sas: driver on pcidev %s cannot handle "
171 "device %llx, error:%d\n",
172 dev_name(sas_ha
->dev
),
173 SAS_ADDR(dev
->sas_addr
), res
);
175 kref_get(&dev
->kref
);
181 void sas_notify_lldd_dev_gone(struct domain_device
*dev
)
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
);
187 if (i
->dft
->lldd_dev_gone
) {
188 i
->dft
->lldd_dev_gone(dev
);
193 /* ---------- Common/dispatchers ---------- */
197 * sas_discover_end_dev -- discover an end device (SSP, etc)
198 * @end: pointer to domain device of interest
200 * See comment in sas_discover_sata().
202 int sas_discover_end_dev(struct domain_device
*dev
)
206 res
= sas_notify_lldd_dev_found(dev
);
210 res
= sas_rphy_add(dev
->rphy
);
217 sas_notify_lldd_dev_gone(dev
);
222 /* ---------- Device registration and unregistration ---------- */
224 void sas_free_device(struct kref
*kref
)
226 struct domain_device
*dev
= container_of(kref
, typeof(*dev
), kref
);
229 sas_put_device(dev
->parent
);
231 /* remove the phys and ports, everything else should be gone */
232 if (dev
->dev_type
== EDGE_DEV
|| dev
->dev_type
== FANOUT_DEV
)
233 kfree(dev
->ex_dev
.ex_phy
);
235 if (dev_is_sata(dev
)) {
236 kfree(dev
->sata_dev
.identify_device
);
237 kfree(dev
->sata_dev
.identify_packet_device
);
243 static void sas_unregister_common_dev(struct asd_sas_port
*port
, struct domain_device
*dev
)
245 sas_notify_lldd_dev_gone(dev
);
247 dev
->port
->port_dev
= NULL
;
249 list_del_init(&dev
->siblings
);
251 spin_lock_irq(&port
->dev_list_lock
);
252 list_del_init(&dev
->dev_list_node
);
253 spin_unlock_irq(&port
->dev_list_lock
);
258 void sas_unregister_dev(struct asd_sas_port
*port
, struct domain_device
*dev
)
261 sas_remove_children(&dev
->rphy
->dev
);
262 sas_rphy_delete(dev
->rphy
);
265 sas_unregister_common_dev(port
, dev
);
268 void sas_unregister_domain_devices(struct asd_sas_port
*port
)
270 struct domain_device
*dev
, *n
;
272 list_for_each_entry_safe_reverse(dev
, n
, &port
->dev_list
, dev_list_node
)
273 sas_unregister_dev(port
, dev
);
275 port
->port
->rphy
= NULL
;
279 /* ---------- Discovery and Revalidation ---------- */
282 * sas_discover_domain -- discover the domain
283 * @port: port to the domain of interest
285 * NOTE: this process _must_ quit (return) as soon as any connection
286 * errors are encountered. Connection recovery is done elsewhere.
287 * Discover process only interrogates devices in order to discover the
290 static void sas_discover_domain(struct work_struct
*work
)
292 struct domain_device
*dev
;
294 struct sas_discovery_event
*ev
=
295 container_of(work
, struct sas_discovery_event
, work
);
296 struct asd_sas_port
*port
= ev
->port
;
298 clear_bit(DISCE_DISCOVER_DOMAIN
, &port
->disc
.pending
);
303 error
= sas_get_port_device(port
);
306 dev
= port
->port_dev
;
308 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port
->id
,
309 task_pid_nr(current
));
311 switch (dev
->dev_type
) {
313 error
= sas_discover_end_dev(dev
);
317 error
= sas_discover_root_expander(dev
);
321 #ifdef CONFIG_SCSI_SAS_ATA
322 error
= sas_discover_sata(dev
);
325 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
330 SAS_DPRINTK("unhandled device %d\n", dev
->dev_type
);
335 sas_rphy_free(dev
->rphy
);
338 spin_lock_irq(&port
->dev_list_lock
);
339 list_del_init(&dev
->dev_list_node
);
340 spin_unlock_irq(&port
->dev_list_lock
);
343 port
->port_dev
= NULL
;
346 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port
->id
,
347 task_pid_nr(current
), error
);
350 static void sas_revalidate_domain(struct work_struct
*work
)
353 struct sas_discovery_event
*ev
=
354 container_of(work
, struct sas_discovery_event
, work
);
355 struct asd_sas_port
*port
= ev
->port
;
357 clear_bit(DISCE_REVALIDATE_DOMAIN
, &port
->disc
.pending
);
359 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port
->id
,
360 task_pid_nr(current
));
362 res
= sas_ex_revalidate_domain(port
->port_dev
);
364 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
365 port
->id
, task_pid_nr(current
), res
);
368 /* ---------- Events ---------- */
370 static void sas_chain_work(struct sas_ha_struct
*ha
, struct work_struct
*work
)
372 /* chained work is not subject to SA_HA_DRAINING or SAS_HA_REGISTERED */
373 scsi_queue_work(ha
->core
.shost
, work
);
376 static void sas_chain_event(int event
, unsigned long *pending
,
377 struct work_struct
*work
,
378 struct sas_ha_struct
*ha
)
380 if (!test_and_set_bit(event
, pending
)) {
383 spin_lock_irqsave(&ha
->state_lock
, flags
);
384 sas_chain_work(ha
, work
);
385 spin_unlock_irqrestore(&ha
->state_lock
, flags
);
389 int sas_discover_event(struct asd_sas_port
*port
, enum discover_event ev
)
391 struct sas_discovery
*disc
;
397 BUG_ON(ev
>= DISC_NUM_EVENTS
);
399 sas_chain_event(ev
, &disc
->pending
, &disc
->disc_work
[ev
].work
, port
->ha
);
405 * sas_init_disc -- initialize the discovery struct in the port
406 * @port: pointer to struct port
408 * Called when the ports are being initialized.
410 void sas_init_disc(struct sas_discovery
*disc
, struct asd_sas_port
*port
)
414 static const work_func_t sas_event_fns
[DISC_NUM_EVENTS
] = {
415 [DISCE_DISCOVER_DOMAIN
] = sas_discover_domain
,
416 [DISCE_REVALIDATE_DOMAIN
] = sas_revalidate_domain
,
420 for (i
= 0; i
< DISC_NUM_EVENTS
; i
++) {
421 INIT_WORK(&disc
->disc_work
[i
].work
, sas_event_fns
[i
]);
422 disc
->disc_work
[i
].port
= port
;