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[SCSI] bsg: unexport sg v3 helper functions
[thirdparty/linux.git] / drivers / scsi / libsas / sas_discover.c
CommitLineData
2908d778
JB		 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/pci.h>
26#include <linux/scatterlist.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
37void 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
58static void sas_task_timedout(unsigned long _task)
59{
60 struct sas_task *task = (void *) _task;
61 unsigned long flags;
62
63 spin_lock_irqsave(&task->task_state_lock, flags);
64 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
65 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
66 spin_unlock_irqrestore(&task->task_state_lock, flags);
67
68 complete(&task->completion);
69}
70
71static void sas_disc_task_done(struct sas_task *task)
72{
73 if (!del_timer(&task->timer))
74 return;
75 complete(&task->completion);
76}
77
78#define SAS_DEV_TIMEOUT 10
79
80/**
81 * sas_execute_task -- Basic task processing for discovery
82 * @task: the task to be executed
83 * @buffer: pointer to buffer to do I/O
84 * @size: size of @buffer
85 * @pci_dma_dir: PCI_DMA_...
86 */
87static int sas_execute_task(struct sas_task *task, void *buffer, int size,
88 int pci_dma_dir)
89{
90 int res = 0;
91 struct scatterlist *scatter = NULL;
92 struct task_status_struct *ts = &task->task_status;
93 int num_scatter = 0;
94 int retries = 0;
95 struct sas_internal *i =
96 to_sas_internal(task->dev->port->ha->core.shost->transportt);
97
98 if (pci_dma_dir != PCI_DMA_NONE) {
99 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
100 if (!scatter)
101 goto out;
102
103 sg_init_one(scatter, buffer, size);
104 num_scatter = 1;
105 }
106
107 task->task_proto = task->dev->tproto;
108 task->scatter = scatter;
109 task->num_scatter = num_scatter;
110 task->total_xfer_len = size;
111 task->data_dir = pci_dma_dir;
112 task->task_done = sas_disc_task_done;
0f05df8b
JB		 113 if (pci_dma_dir != PCI_DMA_NONE &&
114 sas_protocol_ata(task->task_proto)) {
115 task->num_scatter = pci_map_sg(task->dev->port->ha->pcidev,
116 task->scatter,
117 task->num_scatter,
118 task->data_dir);
119 }
2908d778
JB		 120
121 for (retries = 0; retries < 5; retries++) {
122 task->task_state_flags = SAS_TASK_STATE_PENDING;
123 init_completion(&task->completion);
124
125 task->timer.data = (unsigned long) task;
126 task->timer.function = sas_task_timedout;
127 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
128 add_timer(&task->timer);
129
130 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
131 if (res) {
132 del_timer(&task->timer);
133 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
134 res);
135 goto ex_err;
136 }
137 wait_for_completion(&task->completion);
138 res = -ETASK;
139 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
140 int res2;
141 SAS_DPRINTK("task aborted, flags:0x%x\n",
142 task->task_state_flags);
143 res2 = i->dft->lldd_abort_task(task);
144 SAS_DPRINTK("came back from abort task\n");
145 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
146 if (res2 == TMF_RESP_FUNC_COMPLETE)
147 continue; /* Retry the task */
148 else
149 goto ex_err;
150 }
151 }
152 if (task->task_status.stat == SAM_BUSY ||
153 task->task_status.stat == SAM_TASK_SET_FULL ||
154 task->task_status.stat == SAS_QUEUE_FULL) {
155 SAS_DPRINTK("task: q busy, sleeping...\n");
156 schedule_timeout_interruptible(HZ);
157 } else if (task->task_status.stat == SAM_CHECK_COND) {
158 struct scsi_sense_hdr shdr;
159
160 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
161 &shdr)) {
162 SAS_DPRINTK("couldn't normalize sense\n");
163 continue;
164 }
165 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
166 (shdr.sense_key == 2 && shdr.asc == 4 &&
167 shdr.ascq == 1)) {
168 SAS_DPRINTK("device %016llx LUN: %016llx "
169 "powering up or not ready yet, "
170 "sleeping...\n",
171 SAS_ADDR(task->dev->sas_addr),
172 SAS_ADDR(task->ssp_task.LUN));
173
174 schedule_timeout_interruptible(5*HZ);
175 } else if (shdr.sense_key == 1) {
176 res = 0;
177 break;
178 } else if (shdr.sense_key == 5) {
179 break;
180 } else {
181 SAS_DPRINTK("dev %016llx LUN: %016llx "
182 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
183 "\n",
184 SAS_ADDR(task->dev->sas_addr),
185 SAS_ADDR(task->ssp_task.LUN),
186 shdr.sense_key,
187 shdr.asc, shdr.ascq);
188 }
189 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
190 task->task_status.stat != SAM_GOOD) {
191 SAS_DPRINTK("task finished with resp:0x%x, "
192 "stat:0x%x\n",
193 task->task_status.resp,
194 task->task_status.stat);
195 goto ex_err;
196 } else {
197 res = 0;
198 break;
199 }
200 }
201ex_err:
0f05df8b
JB		 202 if (pci_dma_dir != PCI_DMA_NONE) {
203 if (sas_protocol_ata(task->task_proto))
204 pci_unmap_sg(task->dev->port->ha->pcidev,
205 task->scatter, task->num_scatter,
206 task->data_dir);
2908d778 207 kfree(scatter);
0f05df8b 208 }
2908d778
JB		 209out:
210 return res;
211}
212
213/* ---------- Domain device discovery ---------- */
214
215/**
216 * sas_get_port_device -- Discover devices which caused port creation
217 * @port: pointer to struct sas_port of interest
218 *
219 * Devices directly attached to a HA port, have no parent. This is
220 * how we know they are (domain) "root" devices. All other devices
221 * do, and should have their "parent" pointer set appropriately as
222 * soon as a child device is discovered.
223 */
224static int sas_get_port_device(struct asd_sas_port *port)
225{
226 unsigned long flags;
227 struct asd_sas_phy *phy;
228 struct sas_rphy *rphy;
229 struct domain_device *dev;
230
231 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
232 if (!dev)
233 return -ENOMEM;
234
235 spin_lock_irqsave(&port->phy_list_lock, flags);
236 if (list_empty(&port->phy_list)) {
237 spin_unlock_irqrestore(&port->phy_list_lock, flags);
238 kfree(dev);
239 return -ENODEV;
240 }
241 phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
242 spin_lock(&phy->frame_rcvd_lock);
243 memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
244 (size_t)phy->frame_rcvd_size));
245 spin_unlock(&phy->frame_rcvd_lock);
246 spin_unlock_irqrestore(&port->phy_list_lock, flags);
247
248 if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
249 struct dev_to_host_fis *fis =
250 (struct dev_to_host_fis *) dev->frame_rcvd;
251 if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
252 fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
253 && (fis->device & ~0x10) == 0)
254 dev->dev_type = SATA_PM;
255 else
256 dev->dev_type = SATA_DEV;
257 dev->tproto = SATA_PROTO;
258 } else {
259 struct sas_identify_frame *id =
260 (struct sas_identify_frame *) dev->frame_rcvd;
261 dev->dev_type = id->dev_type;
262 dev->iproto = id->initiator_bits;
263 dev->tproto = id->target_bits;
264 }
265
266 sas_init_dev(dev);
267
268 switch (dev->dev_type) {
269 case SAS_END_DEV:
fa1c1e8f 270 case SATA_DEV:
2908d778
JB		 271 rphy = sas_end_device_alloc(port->port);
272 break;
273 case EDGE_DEV:
274 rphy = sas_expander_alloc(port->port,
275 SAS_EDGE_EXPANDER_DEVICE);
276 break;
277 case FANOUT_DEV:
278 rphy = sas_expander_alloc(port->port,
279 SAS_FANOUT_EXPANDER_DEVICE);
280 break;
2908d778
JB		 281 default:
282 printk("ERROR: Unidentified device type %d\n", dev->dev_type);
283 rphy = NULL;
284 break;
285 }
286
287 if (!rphy) {
288 kfree(dev);
289 return -ENODEV;
290 }
291 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
292 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
293 sas_fill_in_rphy(dev, rphy);
294 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
295 port->port_dev = dev;
296 dev->port = port;
297 dev->linkrate = port->linkrate;
298 dev->min_linkrate = port->linkrate;
299 dev->max_linkrate = port->linkrate;
300 dev->pathways = port->num_phys;
301 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
302 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
303 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
304 port->disc.max_level = 0;
305
306 dev->rphy = rphy;
9d720d82 307 spin_lock_irq(&port->dev_list_lock);
2908d778 308 list_add_tail(&dev->dev_list_node, &port->dev_list);
9d720d82 309 spin_unlock_irq(&port->dev_list_lock);
2908d778
JB		 310
311 return 0;
312}
313
314/* ---------- Discover and Revalidate ---------- */
315
316/* ---------- SATA ---------- */
317
318static void sas_get_ata_command_set(struct domain_device *dev)
319{
320 struct dev_to_host_fis *fis =
321 (struct dev_to_host_fis *) dev->frame_rcvd;
322
323 if ((fis->sector_count == 1 && /* ATA */
324 fis->lbal == 1 &&
325 fis->lbam == 0 &&
326 fis->lbah == 0 &&
327 fis->device == 0)
328 ||
329 (fis->sector_count == 0 && /* CE-ATA (mATA) */
330 fis->lbal == 0 &&
331 fis->lbam == 0xCE &&
332 fis->lbah == 0xAA &&
333 (fis->device & ~0x10) == 0))
334
335 dev->sata_dev.command_set = ATA_COMMAND_SET;
336
337 else if ((fis->interrupt_reason == 1 && /* ATAPI */
338 fis->lbal == 1 &&
339 fis->byte_count_low == 0x14 &&
340 fis->byte_count_high == 0xEB &&
341 (fis->device & ~0x10) == 0))
342
343 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
344
345 else if ((fis->sector_count == 1 && /* SEMB */
346 fis->lbal == 1 &&
347 fis->lbam == 0x3C &&
348 fis->lbah == 0xC3 &&
349 fis->device == 0)
350 ||
351 (fis->interrupt_reason == 1 && /* SATA PM */
352 fis->lbal == 1 &&
353 fis->byte_count_low == 0x69 &&
354 fis->byte_count_high == 0x96 &&
355 (fis->device & ~0x10) == 0))
356
357 /* Treat it as a superset? */
358 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
359}
360
361/**
362 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
363 * @dev: the device to send the command to
364 * @command: the command register
365 * @features: the features register
366 * @buffer: pointer to buffer to do I/O
367 * @size: size of @buffer
368 * @pci_dma_dir: PCI_DMA_...
369 */
370static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
371 u8 features, void *buffer, int size,
372 int pci_dma_dir)
373{
374 int res = 0;
375 struct sas_task *task;
376 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
377 &dev->frame_rcvd[0];
378
379 res = -ENOMEM;
380 task = sas_alloc_task(GFP_KERNEL);
381 if (!task)
382 goto out;
383
384 task->dev = dev;
385
0281e02c 386 task->ata_task.fis.fis_type = 0x27;
2908d778
JB		 387 task->ata_task.fis.command = command;
388 task->ata_task.fis.features = features;
389 task->ata_task.fis.device = d2h_fis->device;
390 task->ata_task.retry_count = 1;
391
392 res = sas_execute_task(task, buffer, size, pci_dma_dir);
393
394 sas_free_task(task);
395out:
396 return res;
397}
398
399static void sas_sata_propagate_sas_addr(struct domain_device *dev)
400{
401 unsigned long flags;
402 struct asd_sas_port *port = dev->port;
403 struct asd_sas_phy *phy;
404
405 BUG_ON(dev->parent);
406
407 memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
408 spin_lock_irqsave(&port->phy_list_lock, flags);
409 list_for_each_entry(phy, &port->phy_list, port_phy_el)
410 memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
411 spin_unlock_irqrestore(&port->phy_list_lock, flags);
412}
413
414#define ATA_IDENTIFY_DEV 0xEC
415#define ATA_IDENTIFY_PACKET_DEV 0xA1
416#define ATA_SET_FEATURES 0xEF
417#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
418
419/**
420 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
421 * @dev: STP/SATA device of interest (ATA/ATAPI)
422 *
423 * The LLDD has already been notified of this device, so that we can
424 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
425 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
426 * performance for this device.
427 */
428static int sas_discover_sata_dev(struct domain_device *dev)
429{
430 int res;
431 __le16 *identify_x;
432 u8 command;
433
434 identify_x = kzalloc(512, GFP_KERNEL);
435 if (!identify_x)
436 return -ENOMEM;
437
438 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
439 dev->sata_dev.identify_device = identify_x;
440 command = ATA_IDENTIFY_DEV;
441 } else {
442 dev->sata_dev.identify_packet_device = identify_x;
443 command = ATA_IDENTIFY_PACKET_DEV;
444 }
445
446 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
447 PCI_DMA_FROMDEVICE);
448 if (res)
449 goto out_err;
450
451 /* lives on the media? */
452 if (le16_to_cpu(identify_x[0]) & 4) {
453 /* incomplete response */
454 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
455 "dev %llx\n", SAS_ADDR(dev->sas_addr));
456 if (!le16_to_cpu(identify_x[83] & (1<<6)))
457 goto cont1;
458 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
459 ATA_FEATURE_PUP_STBY_SPIN_UP,
460 NULL, 0, PCI_DMA_NONE);
461 if (res)
462 goto cont1;
463
464 schedule_timeout_interruptible(5*HZ); /* More time? */
465 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
466 PCI_DMA_FROMDEVICE);
467 if (res)
468 goto out_err;
469 }
470cont1:
471 /* Get WWN */
472 if (dev->port->oob_mode != SATA_OOB_MODE) {
473 memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr,
474 SAS_ADDR_SIZE);
475 } else if (dev->sata_dev.command_set == ATA_COMMAND_SET &&
476 (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000)
477 == 0x5000) {
478 int i;
479
480 for (i = 0; i < 4; i++) {
481 dev->sas_addr[2*i] =
482 (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8;
483 dev->sas_addr[2*i+1] =
484 le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF;
485 }
486 }
487 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
488 if (!dev->parent)
489 sas_sata_propagate_sas_addr(dev);
490
491 /* XXX Hint: register this SATA device with SATL.
492 When this returns, dev->sata_dev->lu is alive and
493 present.
494 sas_satl_register_dev(dev);
495 */
fa1c1e8f
DW		 496
497 sas_fill_in_rphy(dev, dev->rphy);
498
0281e02c 499 return 0;
2908d778
JB		 500out_err:
501 dev->sata_dev.identify_packet_device = NULL;
502 dev->sata_dev.identify_device = NULL;
503 kfree(identify_x);
504 return res;
505}
506
507static int sas_discover_sata_pm(struct domain_device *dev)
508{
509 return -ENODEV;
510}
511
512int sas_notify_lldd_dev_found(struct domain_device *dev)
513{
514 int res = 0;
515 struct sas_ha_struct *sas_ha = dev->port->ha;
516 struct Scsi_Host *shost = sas_ha->core.shost;
517 struct sas_internal *i = to_sas_internal(shost->transportt);
518
519 if (i->dft->lldd_dev_found) {
520 res = i->dft->lldd_dev_found(dev);
521 if (res) {
522 printk("sas: driver on pcidev %s cannot handle "
523 "device %llx, error:%d\n",
524 pci_name(sas_ha->pcidev),
525 SAS_ADDR(dev->sas_addr), res);
526 }
527 }
528 return res;
529}
530
531
532void sas_notify_lldd_dev_gone(struct domain_device *dev)
533{
534 struct sas_ha_struct *sas_ha = dev->port->ha;
535 struct Scsi_Host *shost = sas_ha->core.shost;
536 struct sas_internal *i = to_sas_internal(shost->transportt);
537
538 if (i->dft->lldd_dev_gone)
539 i->dft->lldd_dev_gone(dev);
540}
541
542/* ---------- Common/dispatchers ---------- */
543
544/**
545 * sas_discover_sata -- discover an STP/SATA domain device
546 * @dev: pointer to struct domain_device of interest
547 *
548 * First we notify the LLDD of this device, so we can send frames to
549 * it. Then depending on the type of device we call the appropriate
550 * discover functions. Once device discover is done, we notify the
551 * LLDD so that it can fine-tune its parameters for the device, by
552 * removing it and then adding it. That is, the second time around,
553 * the driver would have certain fields, that it is looking at, set.
554 * Finally we initialize the kobj so that the device can be added to
555 * the system at registration time. Devices directly attached to a HA
556 * port, have no parents. All other devices do, and should have their
557 * "parent" pointer set appropriately before calling this function.
558 */
559int sas_discover_sata(struct domain_device *dev)
560{
561 int res;
562
563 sas_get_ata_command_set(dev);
564
565 res = sas_notify_lldd_dev_found(dev);
566 if (res)
0281e02c 567 return res;
2908d778
JB		 568
569 switch (dev->dev_type) {
570 case SATA_DEV:
571 res = sas_discover_sata_dev(dev);
572 break;
573 case SATA_PM:
574 res = sas_discover_sata_pm(dev);
575 break;
576 default:
577 break;
578 }
2908d778 579 sas_notify_lldd_dev_gone(dev);
0281e02c
JB		 580 if (!res) {
581 sas_notify_lldd_dev_found(dev);
582 res = sas_rphy_add(dev->rphy);
583 }
88808398 584
2908d778
JB		 585 return res;
586}
587
588/**
589 * sas_discover_end_dev -- discover an end device (SSP, etc)
590 * @end: pointer to domain device of interest
591 *
592 * See comment in sas_discover_sata().
593 */
594int sas_discover_end_dev(struct domain_device *dev)
595{
596 int res;
597
598 res = sas_notify_lldd_dev_found(dev);
599 if (res)
88808398 600 goto out_err2;
2908d778
JB		 601
602 res = sas_rphy_add(dev->rphy);
603 if (res)
604 goto out_err;
605
2908d778
JB		 606 return 0;
607
608out_err:
609 sas_notify_lldd_dev_gone(dev);
88808398 610out_err2:
2908d778
JB		 611 return res;
612}
613
614/* ---------- Device registration and unregistration ---------- */
615
616static inline void sas_unregister_common_dev(struct domain_device *dev)
617{
618 sas_notify_lldd_dev_gone(dev);
619 if (!dev->parent)
620 dev->port->port_dev = NULL;
621 else
622 list_del_init(&dev->siblings);
623 list_del_init(&dev->dev_list_node);
624}
625
626void sas_unregister_dev(struct domain_device *dev)
627{
628 if (dev->rphy) {
629 sas_remove_children(&dev->rphy->dev);
630 sas_rphy_delete(dev->rphy);
631 dev->rphy = NULL;
632 }
633 if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
634 /* remove the phys and ports, everything else should be gone */
635 kfree(dev->ex_dev.ex_phy);
636 dev->ex_dev.ex_phy = NULL;
637 }
638 sas_unregister_common_dev(dev);
639}
640
641void sas_unregister_domain_devices(struct asd_sas_port *port)
642{
643 struct domain_device *dev, *n;
644
645 list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node)
646 sas_unregister_dev(dev);
647
648 port->port->rphy = NULL;
649
650}
651
652/* ---------- Discovery and Revalidation ---------- */
653
654/**
655 * sas_discover_domain -- discover the domain
656 * @port: port to the domain of interest
657 *
658 * NOTE: this process _must_ quit (return) as soon as any connection
659 * errors are encountered. Connection recovery is done elsewhere.
660 * Discover process only interrogates devices in order to discover the
661 * domain.
662 */
c4028958 663static void sas_discover_domain(struct work_struct *work)
2908d778 664{
6f63caae 665 struct domain_device *dev;
2908d778 666 int error = 0;
c4028958
DH		 667 struct sas_discovery_event *ev =
668 container_of(work, struct sas_discovery_event, work);
669 struct asd_sas_port *port = ev->port;
2908d778
JB		 670
671 sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
672 &port->disc.pending);
673
674 if (port->port_dev)
6f63caae
DW		 675 return;
676
677 error = sas_get_port_device(port);
678 if (error)
679 return;
680 dev = port->port_dev;
2908d778
JB		 681
682 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
683 current->pid);
684
6f63caae 685 switch (dev->dev_type) {
2908d778 686 case SAS_END_DEV:
6f63caae 687 error = sas_discover_end_dev(dev);
2908d778
JB		 688 break;
689 case EDGE_DEV:
690 case FANOUT_DEV:
6f63caae 691 error = sas_discover_root_expander(dev);
2908d778
JB		 692 break;
693 case SATA_DEV:
694 case SATA_PM:
6f63caae 695 error = sas_discover_sata(dev);
2908d778
JB		 696 break;
697 default:
6f63caae 698 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
2908d778
JB		 699 break;
700 }
701
702 if (error) {
6f63caae
DW		 703 sas_rphy_free(dev->rphy);
704 dev->rphy = NULL;
705
9d720d82 706 spin_lock_irq(&port->dev_list_lock);
6f63caae 707 list_del_init(&dev->dev_list_node);
9d720d82 708 spin_unlock_irq(&port->dev_list_lock);
88808398 709
6f63caae 710 kfree(dev); /* not kobject_register-ed yet */
2908d778
JB		 711 port->port_dev = NULL;
712 }
713
714 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
715 current->pid, error);
716}
717
c4028958 718static void sas_revalidate_domain(struct work_struct *work)
2908d778
JB		 719{
720 int res = 0;
c4028958
DH		 721 struct sas_discovery_event *ev =
722 container_of(work, struct sas_discovery_event, work);
723 struct asd_sas_port *port = ev->port;
2908d778
JB		 724
725 sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
726 &port->disc.pending);
727
728 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
729 current->pid);
730 if (port->port_dev)
731 res = sas_ex_revalidate_domain(port->port_dev);
732
733 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
734 port->id, current->pid, res);
735}
736
737/* ---------- Events ---------- */
738
739int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
740{
741 struct sas_discovery *disc;
742
743 if (!port)
744 return 0;
745 disc = &port->disc;
746
747 BUG_ON(ev >= DISC_NUM_EVENTS);
748
749 sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
6b0efb85 750 &disc->disc_work[ev].work, port->ha);
2908d778
JB		 751
752 return 0;
753}
754
755/**
756 * sas_init_disc -- initialize the discovery struct in the port
757 * @port: pointer to struct port
758 *
759 * Called when the ports are being initialized.
760 */
761void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
762{
763 int i;
764
c4028958 765 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
2908d778
JB		 766 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
767 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
768 };
769
770 spin_lock_init(&disc->disc_event_lock);
771 disc->pending = 0;
c4028958
DH		 772 for (i = 0; i < DISC_NUM_EVENTS; i++) {
773 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
774 disc->disc_work[i].port = port;
775 }
2908d778 776}
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