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 sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
299 &port->disc.pending);
304 error = sas_get_port_device(port);
307 dev = port->port_dev;
309 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
310 task_pid_nr(current));
312 switch (dev->dev_type) {
314 error = sas_discover_end_dev(dev);
318 error = sas_discover_root_expander(dev);
322 #ifdef CONFIG_SCSI_SAS_ATA
323 error = sas_discover_sata(dev);
326 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
331 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
336 sas_rphy_free(dev->rphy);
339 spin_lock_irq(&port->dev_list_lock);
340 list_del_init(&dev->dev_list_node);
341 spin_unlock_irq(&port->dev_list_lock);
344 port->port_dev = NULL;
347 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
348 task_pid_nr(current), error);
351 static void sas_revalidate_domain(struct work_struct *work)
354 struct sas_discovery_event *ev =
355 container_of(work, struct sas_discovery_event, work);
356 struct asd_sas_port *port = ev->port;
358 sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
359 &port->disc.pending);
361 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
362 task_pid_nr(current));
364 res = sas_ex_revalidate_domain(port->port_dev);
366 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
367 port->id, task_pid_nr(current), res);
370 /* ---------- Events ---------- */
372 int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
374 struct sas_discovery *disc;
380 BUG_ON(ev >= DISC_NUM_EVENTS);
382 sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
383 &disc->disc_work[ev].work, port->ha);
389 * sas_init_disc -- initialize the discovery struct in the port
390 * @port: pointer to struct port
392 * Called when the ports are being initialized.
394 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
398 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
399 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
400 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
403 spin_lock_init(&disc->disc_event_lock);
405 for (i = 0; i < DISC_NUM_EVENTS; i++) {
406 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
407 disc->disc_work[i].port = port;