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_internal.h"
34
35 /* ---------- Basic task processing for discovery purposes ---------- */
36
sas_init_dev(struct domain_device * dev)37 void sas_init_dev(struct domain_device *dev)
38 {
39 INIT_LIST_HEAD(&dev->siblings);
40 INIT_LIST_HEAD(&dev->dev_list_node);
41 switch (dev->dev_type) {
42 case SAS_END_DEV:
43 break;
44 case EDGE_DEV:
45 case FANOUT_DEV:
46 INIT_LIST_HEAD(&dev->ex_dev.children);
47 break;
48 case SATA_DEV:
49 case SATA_PM:
50 case SATA_PM_PORT:
51 INIT_LIST_HEAD(&dev->sata_dev.children);
52 break;
53 default:
54 break;
55 }
56 }
57
58 /* ---------- Domain device discovery ---------- */
59
60 /**
61 * sas_get_port_device -- Discover devices which caused port creation
62 * @port: pointer to struct sas_port of interest
63 *
64 * Devices directly attached to a HA port, have no parent. This is
65 * how we know they are (domain) "root" devices. All other devices
66 * do, and should have their "parent" pointer set appropriately as
67 * soon as a child device is discovered.
68 */
sas_get_port_device(struct asd_sas_port * port)69 static int sas_get_port_device(struct asd_sas_port *port)
70 {
71 unsigned long flags;
72 struct asd_sas_phy *phy;
73 struct sas_rphy *rphy;
74 struct domain_device *dev;
75
76 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
77 if (!dev)
78 return -ENOMEM;
79
80 spin_lock_irqsave(&port->phy_list_lock, flags);
81 if (list_empty(&port->phy_list)) {
82 spin_unlock_irqrestore(&port->phy_list_lock, flags);
83 kfree(dev);
84 return -ENODEV;
85 }
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_irqrestore(&port->phy_list_lock, flags);
92
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;
100 else
101 dev->dev_type = SATA_DEV;
102 dev->tproto = SAS_PROTOCOL_SATA;
103 } else {
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;
109 }
110
111 sas_init_dev(dev);
112
113 switch (dev->dev_type) {
114 case SAS_END_DEV:
115 case SATA_DEV:
116 rphy = sas_end_device_alloc(port->port);
117 break;
118 case EDGE_DEV:
119 rphy = sas_expander_alloc(port->port,
120 SAS_EDGE_EXPANDER_DEVICE);
121 break;
122 case FANOUT_DEV:
123 rphy = sas_expander_alloc(port->port,
124 SAS_FANOUT_EXPANDER_DEVICE);
125 break;
126 default:
127 printk("ERROR: Unidentified device type %d\n", dev->dev_type);
128 rphy = NULL;
129 break;
130 }
131
132 if (!rphy) {
133 kfree(dev);
134 return -ENODEV;
135 }
136 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
137 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
138 sas_fill_in_rphy(dev, rphy);
139 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
140 port->port_dev = dev;
141 dev->port = port;
142 dev->linkrate = port->linkrate;
143 dev->min_linkrate = port->linkrate;
144 dev->max_linkrate = port->linkrate;
145 dev->pathways = port->num_phys;
146 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
147 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
148 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
149 port->disc.max_level = 0;
150
151 dev->rphy = rphy;
152 spin_lock_irq(&port->dev_list_lock);
153 list_add_tail(&dev->dev_list_node, &port->dev_list);
154 spin_unlock_irq(&port->dev_list_lock);
155
156 return 0;
157 }
158
159 /* ---------- Discover and Revalidate ---------- */
160
sas_notify_lldd_dev_found(struct domain_device * dev)161 int sas_notify_lldd_dev_found(struct domain_device *dev)
162 {
163 int res = 0;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *shost = sas_ha->core.shost;
166 struct sas_internal *i = to_sas_internal(shost->transportt);
167
168 if (i->dft->lldd_dev_found) {
169 res = i->dft->lldd_dev_found(dev);
170 if (res) {
171 printk("sas: driver on pcidev %s cannot handle "
172 "device %llx, error:%d\n",
173 dev_name(sas_ha->dev),
174 SAS_ADDR(dev->sas_addr), res);
175 }
176 }
177 return res;
178 }
179
180
sas_notify_lldd_dev_gone(struct domain_device * dev)181 void sas_notify_lldd_dev_gone(struct domain_device *dev)
182 {
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);
186
187 if (i->dft->lldd_dev_gone)
188 i->dft->lldd_dev_gone(dev);
189 }
190
191 /* ---------- Common/dispatchers ---------- */
192
193
194 /**
195 * sas_discover_end_dev -- discover an end device (SSP, etc)
196 * @end: pointer to domain device of interest
197 *
198 * See comment in sas_discover_sata().
199 */
sas_discover_end_dev(struct domain_device * dev)200 int sas_discover_end_dev(struct domain_device *dev)
201 {
202 int res;
203
204 res = sas_notify_lldd_dev_found(dev);
205 if (res)
206 goto out_err2;
207
208 res = sas_rphy_add(dev->rphy);
209 if (res)
210 goto out_err;
211
212 return 0;
213
214 out_err:
215 sas_notify_lldd_dev_gone(dev);
216 out_err2:
217 return res;
218 }
219
220 /* ---------- Device registration and unregistration ---------- */
221
sas_unregister_common_dev(struct domain_device * dev)222 static inline void sas_unregister_common_dev(struct domain_device *dev)
223 {
224 sas_notify_lldd_dev_gone(dev);
225 if (!dev->parent)
226 dev->port->port_dev = NULL;
227 else
228 list_del_init(&dev->siblings);
229 list_del_init(&dev->dev_list_node);
230 }
231
sas_unregister_dev(struct domain_device * dev)232 void sas_unregister_dev(struct domain_device *dev)
233 {
234 if (dev->rphy) {
235 sas_remove_children(&dev->rphy->dev);
236 sas_rphy_delete(dev->rphy);
237 dev->rphy = NULL;
238 }
239 if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
240 /* remove the phys and ports, everything else should be gone */
241 kfree(dev->ex_dev.ex_phy);
242 dev->ex_dev.ex_phy = NULL;
243 }
244 sas_unregister_common_dev(dev);
245 }
246
sas_unregister_domain_devices(struct asd_sas_port * port)247 void sas_unregister_domain_devices(struct asd_sas_port *port)
248 {
249 struct domain_device *dev, *n;
250
251 list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node)
252 sas_unregister_dev(dev);
253
254 port->port->rphy = NULL;
255
256 }
257
258 /* ---------- Discovery and Revalidation ---------- */
259
260 /**
261 * sas_discover_domain -- discover the domain
262 * @port: port to the domain of interest
263 *
264 * NOTE: this process _must_ quit (return) as soon as any connection
265 * errors are encountered. Connection recovery is done elsewhere.
266 * Discover process only interrogates devices in order to discover the
267 * domain.
268 */
sas_discover_domain(struct work_struct * work)269 static void sas_discover_domain(struct work_struct *work)
270 {
271 struct domain_device *dev;
272 int error = 0;
273 struct sas_discovery_event *ev =
274 container_of(work, struct sas_discovery_event, work);
275 struct asd_sas_port *port = ev->port;
276
277 sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
278 &port->disc.pending);
279
280 if (port->port_dev)
281 return;
282
283 error = sas_get_port_device(port);
284 if (error)
285 return;
286 dev = port->port_dev;
287
288 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
289 task_pid_nr(current));
290
291 switch (dev->dev_type) {
292 case SAS_END_DEV:
293 error = sas_discover_end_dev(dev);
294 break;
295 case EDGE_DEV:
296 case FANOUT_DEV:
297 error = sas_discover_root_expander(dev);
298 break;
299 case SATA_DEV:
300 case SATA_PM:
301 #ifdef CONFIG_SCSI_SAS_ATA
302 error = sas_discover_sata(dev);
303 break;
304 #else
305 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
306 /* Fall through */
307 #endif
308 default:
309 error = -ENXIO;
310 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
311 break;
312 }
313
314 if (error) {
315 sas_rphy_free(dev->rphy);
316 dev->rphy = NULL;
317
318 spin_lock_irq(&port->dev_list_lock);
319 list_del_init(&dev->dev_list_node);
320 spin_unlock_irq(&port->dev_list_lock);
321
322 kfree(dev); /* not kobject_register-ed yet */
323 port->port_dev = NULL;
324 }
325
326 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
327 task_pid_nr(current), error);
328 }
329
sas_revalidate_domain(struct work_struct * work)330 static void sas_revalidate_domain(struct work_struct *work)
331 {
332 int res = 0;
333 struct sas_discovery_event *ev =
334 container_of(work, struct sas_discovery_event, work);
335 struct asd_sas_port *port = ev->port;
336
337 sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
338 &port->disc.pending);
339
340 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
341 task_pid_nr(current));
342 if (port->port_dev)
343 res = sas_ex_revalidate_domain(port->port_dev);
344
345 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
346 port->id, task_pid_nr(current), res);
347 }
348
349 /* ---------- Events ---------- */
350
sas_discover_event(struct asd_sas_port * port,enum discover_event ev)351 int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
352 {
353 struct sas_discovery *disc;
354
355 if (!port)
356 return 0;
357 disc = &port->disc;
358
359 BUG_ON(ev >= DISC_NUM_EVENTS);
360
361 sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
362 &disc->disc_work[ev].work, port->ha);
363
364 return 0;
365 }
366
367 /**
368 * sas_init_disc -- initialize the discovery struct in the port
369 * @port: pointer to struct port
370 *
371 * Called when the ports are being initialized.
372 */
sas_init_disc(struct sas_discovery * disc,struct asd_sas_port * port)373 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
374 {
375 int i;
376
377 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
378 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
379 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
380 };
381
382 spin_lock_init(&disc->disc_event_lock);
383 disc->pending = 0;
384 for (i = 0; i < DISC_NUM_EVENTS; i++) {
385 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
386 disc->disc_work[i].port = port;
387 }
388 }
389