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 spin_lock_irq(&port->phy_list_lock);
138 list_for_each_entry(phy, &port->phy_list, port_phy_el)
139 sas_phy_set_target(phy, dev);
140 spin_unlock_irq(&port->phy_list_lock);
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;
147 dev->linkrate = port->linkrate;
148 dev->min_linkrate = port->linkrate;
149 dev->max_linkrate = port->linkrate;
150 dev->pathways = port->num_phys;
151 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
152 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
153 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
154 port->disc.max_level = 0;
155 sas_device_set_phy(dev, port->port);
159 if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEV)
160 list_add_tail(&dev->disco_list_node, &port->disco_list);
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);
170 /* ---------- Discover and Revalidate ---------- */
172 int sas_notify_lldd_dev_found(struct domain_device *dev)
175 struct sas_ha_struct *sas_ha = dev->port->ha;
176 struct Scsi_Host *shost = sas_ha->core.shost;
177 struct sas_internal *i = to_sas_internal(shost->transportt);
179 if (i->dft->lldd_dev_found) {
180 res = i->dft->lldd_dev_found(dev);
182 printk("sas: driver on pcidev %s cannot handle "
183 "device %llx, error:%d\n",
184 dev_name(sas_ha->dev),
185 SAS_ADDR(dev->sas_addr), res);
187 kref_get(&dev->kref);
193 void sas_notify_lldd_dev_gone(struct domain_device *dev)
195 struct sas_ha_struct *sas_ha = dev->port->ha;
196 struct Scsi_Host *shost = sas_ha->core.shost;
197 struct sas_internal *i = to_sas_internal(shost->transportt);
199 if (i->dft->lldd_dev_gone) {
200 i->dft->lldd_dev_gone(dev);
205 static void sas_probe_devices(struct work_struct *work)
207 struct domain_device *dev, *n;
208 struct sas_discovery_event *ev = to_sas_discovery_event(work);
209 struct asd_sas_port *port = ev->port;
211 clear_bit(DISCE_PROBE, &port->disc.pending);
213 /* devices must be domain members before link recovery and probe */
214 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
215 spin_lock_irq(&port->dev_list_lock);
216 list_add_tail(&dev->dev_list_node, &port->dev_list);
217 spin_unlock_irq(&port->dev_list_lock);
220 sas_probe_sata(port);
222 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
225 err = sas_rphy_add(dev->rphy);
227 sas_fail_probe(dev, __func__, err);
229 list_del_init(&dev->disco_list_node);
234 * sas_discover_end_dev -- discover an end device (SSP, etc)
235 * @end: pointer to domain device of interest
237 * See comment in sas_discover_sata().
239 int sas_discover_end_dev(struct domain_device *dev)
243 res = sas_notify_lldd_dev_found(dev);
246 sas_discover_event(dev->port, DISCE_PROBE);
251 /* ---------- Device registration and unregistration ---------- */
253 void sas_free_device(struct kref *kref)
255 struct domain_device *dev = container_of(kref, typeof(*dev), kref);
258 sas_put_device(dev->parent);
260 sas_port_put_phy(dev->phy);
263 /* remove the phys and ports, everything else should be gone */
264 if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV)
265 kfree(dev->ex_dev.ex_phy);
267 if (dev_is_sata(dev) && dev->sata_dev.ap) {
268 ata_sas_port_destroy(dev->sata_dev.ap);
269 dev->sata_dev.ap = NULL;
275 static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
277 sas_notify_lldd_dev_gone(dev);
279 dev->port->port_dev = NULL;
281 list_del_init(&dev->siblings);
283 spin_lock_irq(&port->dev_list_lock);
284 list_del_init(&dev->dev_list_node);
285 spin_unlock_irq(&port->dev_list_lock);
290 static void sas_destruct_devices(struct work_struct *work)
292 struct domain_device *dev, *n;
293 struct sas_discovery_event *ev = to_sas_discovery_event(work);
294 struct asd_sas_port *port = ev->port;
296 clear_bit(DISCE_DESTRUCT, &port->disc.pending);
298 list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
299 list_del_init(&dev->disco_list_node);
301 sas_remove_children(&dev->rphy->dev);
302 sas_rphy_delete(dev->rphy);
304 sas_unregister_common_dev(port, dev);
308 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
310 if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
311 !list_empty(&dev->disco_list_node)) {
312 /* this rphy never saw sas_rphy_add */
313 list_del_init(&dev->disco_list_node);
314 sas_rphy_free(dev->rphy);
316 sas_unregister_common_dev(port, dev);
319 if (dev->rphy && !test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
320 sas_rphy_unlink(dev->rphy);
321 list_move_tail(&dev->disco_list_node, &port->destroy_list);
322 sas_discover_event(dev->port, DISCE_DESTRUCT);
326 void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
328 struct domain_device *dev, *n;
330 list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
332 set_bit(SAS_DEV_GONE, &dev->state);
333 sas_unregister_dev(port, dev);
336 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
337 sas_unregister_dev(port, dev);
339 port->port->rphy = NULL;
343 void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
345 struct sas_ha_struct *ha;
346 struct sas_phy *new_phy;
352 new_phy = sas_port_get_phy(port);
354 /* pin and record last seen phy */
355 spin_lock_irq(&ha->phy_port_lock);
357 sas_port_put_phy(dev->phy);
360 spin_unlock_irq(&ha->phy_port_lock);
363 /* ---------- Discovery and Revalidation ---------- */
366 * sas_discover_domain -- discover the domain
367 * @port: port to the domain of interest
369 * NOTE: this process _must_ quit (return) as soon as any connection
370 * errors are encountered. Connection recovery is done elsewhere.
371 * Discover process only interrogates devices in order to discover the
374 static void sas_discover_domain(struct work_struct *work)
376 struct domain_device *dev;
378 struct sas_discovery_event *ev = to_sas_discovery_event(work);
379 struct asd_sas_port *port = ev->port;
381 clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
386 error = sas_get_port_device(port);
389 dev = port->port_dev;
391 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
392 task_pid_nr(current));
394 switch (dev->dev_type) {
396 error = sas_discover_end_dev(dev);
400 error = sas_discover_root_expander(dev);
404 #ifdef CONFIG_SCSI_SAS_ATA
405 error = sas_discover_sata(dev);
408 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
413 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
418 sas_rphy_free(dev->rphy);
421 list_del_init(&dev->disco_list_node);
422 spin_lock_irq(&port->dev_list_lock);
423 list_del_init(&dev->dev_list_node);
424 spin_unlock_irq(&port->dev_list_lock);
427 port->port_dev = NULL;
430 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
431 task_pid_nr(current), error);
434 static void sas_revalidate_domain(struct work_struct *work)
437 struct sas_discovery_event *ev = to_sas_discovery_event(work);
438 struct asd_sas_port *port = ev->port;
439 struct sas_ha_struct *ha = port->ha;
441 /* prevent revalidation from finding sata links in recovery */
442 mutex_lock(&ha->disco_mutex);
443 if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
444 SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
445 port->id, task_pid_nr(current));
449 clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
451 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
452 task_pid_nr(current));
455 res = sas_ex_revalidate_domain(port->port_dev);
457 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
458 port->id, task_pid_nr(current), res);
460 mutex_unlock(&ha->disco_mutex);
463 /* ---------- Events ---------- */
465 static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
467 /* chained work is not subject to SA_HA_DRAINING or
468 * SAS_HA_REGISTERED, because it is either submitted in the
469 * workqueue, or known to be submitted from a context that is
470 * not racing against draining
472 scsi_queue_work(ha->core.shost, &sw->work);
475 static void sas_chain_event(int event, unsigned long *pending,
477 struct sas_ha_struct *ha)
479 if (!test_and_set_bit(event, pending)) {
482 spin_lock_irqsave(&ha->state_lock, flags);
483 sas_chain_work(ha, sw);
484 spin_unlock_irqrestore(&ha->state_lock, flags);
488 int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
490 struct sas_discovery *disc;
496 BUG_ON(ev >= DISC_NUM_EVENTS);
498 sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
504 * sas_init_disc -- initialize the discovery struct in the port
505 * @port: pointer to struct port
507 * Called when the ports are being initialized.
509 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
513 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
514 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
515 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
516 [DISCE_PROBE] = sas_probe_devices,
517 [DISCE_DESTRUCT] = sas_destruct_devices,
521 for (i = 0; i < DISC_NUM_EVENTS; i++) {
522 INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
523 disc->disc_work[i].port = port;