[SCSI] libsas: introduce sas_drain_work()
[deliverable/linux.git] / drivers / scsi / libsas / sas_discover.c
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_ata.h>
34 #include "../scsi_sas_internal.h"
35
36 /* ---------- Basic task processing for discovery purposes ---------- */
37
38 void sas_init_dev(struct domain_device *dev)
39 {
40 switch (dev->dev_type) {
41 case SAS_END_DEV:
42 break;
43 case EDGE_DEV:
44 case FANOUT_DEV:
45 INIT_LIST_HEAD(&dev->ex_dev.children);
46 break;
47 case SATA_DEV:
48 case SATA_PM:
49 case SATA_PM_PORT:
50 INIT_LIST_HEAD(&dev->sata_dev.children);
51 break;
52 default:
53 break;
54 }
55 }
56
57 /* ---------- Domain device discovery ---------- */
58
59 /**
60 * sas_get_port_device -- Discover devices which caused port creation
61 * @port: pointer to struct sas_port of interest
62 *
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.
67 */
68 static int sas_get_port_device(struct asd_sas_port *port)
69 {
70 unsigned long flags;
71 struct asd_sas_phy *phy;
72 struct sas_rphy *rphy;
73 struct domain_device *dev;
74
75 dev = sas_alloc_device();
76 if (!dev)
77 return -ENOMEM;
78
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);
82 sas_put_device(dev);
83 return -ENODEV;
84 }
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);
91
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;
99 else
100 dev->dev_type = SATA_DEV;
101 dev->tproto = SAS_PROTOCOL_SATA;
102 } else {
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;
108 }
109
110 sas_init_dev(dev);
111
112 switch (dev->dev_type) {
113 case SAS_END_DEV:
114 case SATA_DEV:
115 rphy = sas_end_device_alloc(port->port);
116 break;
117 case EDGE_DEV:
118 rphy = sas_expander_alloc(port->port,
119 SAS_EDGE_EXPANDER_DEVICE);
120 break;
121 case FANOUT_DEV:
122 rphy = sas_expander_alloc(port->port,
123 SAS_FANOUT_EXPANDER_DEVICE);
124 break;
125 default:
126 printk("ERROR: Unidentified device type %d\n", dev->dev_type);
127 rphy = NULL;
128 break;
129 }
130
131 if (!rphy) {
132 sas_put_device(dev);
133 return -ENODEV;
134 }
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;
140 dev->port = port;
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;
149
150 dev->rphy = rphy;
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);
154
155 return 0;
156 }
157
158 /* ---------- Discover and Revalidate ---------- */
159
160 int sas_notify_lldd_dev_found(struct domain_device *dev)
161 {
162 int res = 0;
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);
166
167 if (i->dft->lldd_dev_found) {
168 res = i->dft->lldd_dev_found(dev);
169 if (res) {
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);
174 }
175 kref_get(&dev->kref);
176 }
177 return res;
178 }
179
180
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 sas_put_device(dev);
190 }
191 }
192
193 /* ---------- Common/dispatchers ---------- */
194
195
196 /**
197 * sas_discover_end_dev -- discover an end device (SSP, etc)
198 * @end: pointer to domain device of interest
199 *
200 * See comment in sas_discover_sata().
201 */
202 int sas_discover_end_dev(struct domain_device *dev)
203 {
204 int res;
205
206 res = sas_notify_lldd_dev_found(dev);
207 if (res)
208 goto out_err2;
209
210 res = sas_rphy_add(dev->rphy);
211 if (res)
212 goto out_err;
213
214 return 0;
215
216 out_err:
217 sas_notify_lldd_dev_gone(dev);
218 out_err2:
219 return res;
220 }
221
222 /* ---------- Device registration and unregistration ---------- */
223
224 void sas_free_device(struct kref *kref)
225 {
226 struct domain_device *dev = container_of(kref, typeof(*dev), kref);
227
228 if (dev->parent)
229 sas_put_device(dev->parent);
230
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);
234
235 if (dev_is_sata(dev)) {
236 kfree(dev->sata_dev.identify_device);
237 kfree(dev->sata_dev.identify_packet_device);
238 }
239
240 kfree(dev);
241 }
242
243 static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
244 {
245 sas_notify_lldd_dev_gone(dev);
246 if (!dev->parent)
247 dev->port->port_dev = NULL;
248 else
249 list_del_init(&dev->siblings);
250
251 spin_lock_irq(&port->dev_list_lock);
252 list_del_init(&dev->dev_list_node);
253 spin_unlock_irq(&port->dev_list_lock);
254
255 sas_put_device(dev);
256 }
257
258 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
259 {
260 if (dev->rphy) {
261 sas_remove_children(&dev->rphy->dev);
262 sas_rphy_delete(dev->rphy);
263 dev->rphy = NULL;
264 }
265 sas_unregister_common_dev(port, dev);
266 }
267
268 void sas_unregister_domain_devices(struct asd_sas_port *port)
269 {
270 struct domain_device *dev, *n;
271
272 list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node)
273 sas_unregister_dev(port, dev);
274
275 port->port->rphy = NULL;
276
277 }
278
279 /* ---------- Discovery and Revalidation ---------- */
280
281 /**
282 * sas_discover_domain -- discover the domain
283 * @port: port to the domain of interest
284 *
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
288 * domain.
289 */
290 static void sas_discover_domain(struct work_struct *work)
291 {
292 struct domain_device *dev;
293 int error = 0;
294 struct sas_discovery_event *ev =
295 container_of(work, struct sas_discovery_event, work);
296 struct asd_sas_port *port = ev->port;
297
298 clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
299
300 if (port->port_dev)
301 return;
302
303 error = sas_get_port_device(port);
304 if (error)
305 return;
306 dev = port->port_dev;
307
308 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
309 task_pid_nr(current));
310
311 switch (dev->dev_type) {
312 case SAS_END_DEV:
313 error = sas_discover_end_dev(dev);
314 break;
315 case EDGE_DEV:
316 case FANOUT_DEV:
317 error = sas_discover_root_expander(dev);
318 break;
319 case SATA_DEV:
320 case SATA_PM:
321 #ifdef CONFIG_SCSI_SAS_ATA
322 error = sas_discover_sata(dev);
323 break;
324 #else
325 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
326 /* Fall through */
327 #endif
328 default:
329 error = -ENXIO;
330 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
331 break;
332 }
333
334 if (error) {
335 sas_rphy_free(dev->rphy);
336 dev->rphy = NULL;
337
338 spin_lock_irq(&port->dev_list_lock);
339 list_del_init(&dev->dev_list_node);
340 spin_unlock_irq(&port->dev_list_lock);
341
342 sas_put_device(dev);
343 port->port_dev = NULL;
344 }
345
346 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
347 task_pid_nr(current), error);
348 }
349
350 static void sas_revalidate_domain(struct work_struct *work)
351 {
352 int res = 0;
353 struct sas_discovery_event *ev =
354 container_of(work, struct sas_discovery_event, work);
355 struct asd_sas_port *port = ev->port;
356
357 clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
358
359 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
360 task_pid_nr(current));
361 if (port->port_dev)
362 res = sas_ex_revalidate_domain(port->port_dev);
363
364 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
365 port->id, task_pid_nr(current), res);
366 }
367
368 /* ---------- Events ---------- */
369
370 static void sas_chain_work(struct sas_ha_struct *ha, struct work_struct *work)
371 {
372 /* chained work is not subject to SA_HA_DRAINING or SAS_HA_REGISTERED */
373 scsi_queue_work(ha->core.shost, work);
374 }
375
376 static void sas_chain_event(int event, unsigned long *pending,
377 struct work_struct *work,
378 struct sas_ha_struct *ha)
379 {
380 if (!test_and_set_bit(event, pending)) {
381 unsigned long flags;
382
383 spin_lock_irqsave(&ha->state_lock, flags);
384 sas_chain_work(ha, work);
385 spin_unlock_irqrestore(&ha->state_lock, flags);
386 }
387 }
388
389 int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
390 {
391 struct sas_discovery *disc;
392
393 if (!port)
394 return 0;
395 disc = &port->disc;
396
397 BUG_ON(ev >= DISC_NUM_EVENTS);
398
399 sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
400
401 return 0;
402 }
403
404 /**
405 * sas_init_disc -- initialize the discovery struct in the port
406 * @port: pointer to struct port
407 *
408 * Called when the ports are being initialized.
409 */
410 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
411 {
412 int i;
413
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,
417 };
418
419 disc->pending = 0;
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;
423 }
424 }
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