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[SCSI] libsas: Allow expander T-T attachments
[deliverable/linux.git] / drivers / scsi / libsas / sas_expander.c
CommitLineData
2908d778
JB		 1/*
2 * Serial Attached SCSI (SAS) Expander discovery and configuration
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
2908d778 25#include <linux/scatterlist.h>
ba1fc175 26#include <linux/blkdev.h>
5a0e3ad6 27#include <linux/slab.h>
2908d778
JB		 28
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
35static int sas_discover_expander(struct domain_device *dev);
36static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
37static int sas_configure_phy(struct domain_device *dev, int phy_id,
38 u8 *sas_addr, int include);
39static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr);
40
2908d778
JB		 41/* ---------- SMP task management ---------- */
42
43static void smp_task_timedout(unsigned long _task)
44{
45 struct sas_task *task = (void *) _task;
46 unsigned long flags;
47
48 spin_lock_irqsave(&task->task_state_lock, flags);
49 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
50 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
51 spin_unlock_irqrestore(&task->task_state_lock, flags);
52
53 complete(&task->completion);
54}
55
56static void smp_task_done(struct sas_task *task)
57{
58 if (!del_timer(&task->timer))
59 return;
60 complete(&task->completion);
61}
62
63/* Give it some long enough timeout. In seconds. */
64#define SMP_TIMEOUT 10
65
66static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
67 void *resp, int resp_size)
68{
42961ee8 69 int res, retry;
70 struct sas_task *task = NULL;
2908d778
JB		 71 struct sas_internal *i =
72 to_sas_internal(dev->port->ha->core.shost->transportt);
73
42961ee8 74 for (retry = 0; retry < 3; retry++) {
75 task = sas_alloc_task(GFP_KERNEL);
76 if (!task)
77 return -ENOMEM;
2908d778 78
42961ee8 79 task->dev = dev;
80 task->task_proto = dev->tproto;
81 sg_init_one(&task->smp_task.smp_req, req, req_size);
82 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
2908d778 83
42961ee8 84 task->task_done = smp_task_done;
2908d778 85
42961ee8 86 task->timer.data = (unsigned long) task;
87 task->timer.function = smp_task_timedout;
88 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
89 add_timer(&task->timer);
2908d778 90
42961ee8 91 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
2908d778 92
42961ee8 93 if (res) {
94 del_timer(&task->timer);
95 SAS_DPRINTK("executing SMP task failed:%d\n", res);
2908d778
JB		 96 goto ex_err;
97 }
42961ee8 98
99 wait_for_completion(&task->completion);
32e8ae36 100 res = -ECOMM;
42961ee8 101 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
102 SAS_DPRINTK("smp task timed out or aborted\n");
103 i->dft->lldd_abort_task(task);
104 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
105 SAS_DPRINTK("SMP task aborted and not done\n");
106 goto ex_err;
107 }
108 }
109 if (task->task_status.resp == SAS_TASK_COMPLETE &&
df64d3ca 110 task->task_status.stat == SAM_STAT_GOOD) {
42961ee8 111 res = 0;
112 break;
2d4b63e1
JB		 113 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
114 task->task_status.stat == SAS_DATA_UNDERRUN) {
115 /* no error, but return the number of bytes of
116 * underrun */
117 res = task->task_status.residual;
118 break;
119 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
120 task->task_status.stat == SAS_DATA_OVERRUN) {
121 res = -EMSGSIZE;
122 break;
42961ee8 123 } else {
124 SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
cadbd4a5 125 "status 0x%x\n", __func__,
42961ee8 126 SAS_ADDR(dev->sas_addr),
127 task->task_status.resp,
128 task->task_status.stat);
129 sas_free_task(task);
130 task = NULL;
131 }
2908d778 132 }
2908d778 133ex_err:
42961ee8 134 BUG_ON(retry == 3 && task != NULL);
135 if (task != NULL) {
136 sas_free_task(task);
137 }
2908d778
JB		 138 return res;
139}
140
141/* ---------- Allocations ---------- */
142
143static inline void *alloc_smp_req(int size)
144{
145 u8 *p = kzalloc(size, GFP_KERNEL);
146 if (p)
147 p[0] = SMP_REQUEST;
148 return p;
149}
150
151static inline void *alloc_smp_resp(int size)
152{
153 return kzalloc(size, GFP_KERNEL);
154}
155
156/* ---------- Expander configuration ---------- */
157
158static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
159 void *disc_resp)
160{
161 struct expander_device *ex = &dev->ex_dev;
162 struct ex_phy *phy = &ex->ex_phy[phy_id];
163 struct smp_resp *resp = disc_resp;
164 struct discover_resp *dr = &resp->disc;
165 struct sas_rphy *rphy = dev->rphy;
166 int rediscover = (phy->phy != NULL);
167
168 if (!rediscover) {
169 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
170
171 /* FIXME: error_handling */
172 BUG_ON(!phy->phy);
173 }
174
175 switch (resp->result) {
176 case SMP_RESP_PHY_VACANT:
177 phy->phy_state = PHY_VACANT;
2bc72c91 178 break;
2908d778
JB		 179 default:
180 phy->phy_state = PHY_NOT_PRESENT;
2bc72c91 181 break;
2908d778
JB		 182 case SMP_RESP_FUNC_ACC:
183 phy->phy_state = PHY_EMPTY; /* do not know yet */
184 break;
185 }
186
187 phy->phy_id = phy_id;
188 phy->attached_dev_type = dr->attached_dev_type;
189 phy->linkrate = dr->linkrate;
190 phy->attached_sata_host = dr->attached_sata_host;
191 phy->attached_sata_dev = dr->attached_sata_dev;
192 phy->attached_sata_ps = dr->attached_sata_ps;
193 phy->attached_iproto = dr->iproto << 1;
194 phy->attached_tproto = dr->tproto << 1;
195 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
196 phy->attached_phy_id = dr->attached_phy_id;
197 phy->phy_change_count = dr->change_count;
198 phy->routing_attr = dr->routing_attr;
199 phy->virtual = dr->virtual;
200 phy->last_da_index = -1;
201
202 phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
203 phy->phy->identify.target_port_protocols = phy->attached_tproto;
204 phy->phy->identify.phy_identifier = phy_id;
a01e70e5
JB		 205 phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
206 phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
207 phy->phy->minimum_linkrate = dr->pmin_linkrate;
208 phy->phy->maximum_linkrate = dr->pmax_linkrate;
88edf746 209 phy->phy->negotiated_linkrate = phy->linkrate;
2908d778
JB		 210
211 if (!rediscover)
2bc72c91
JW		 212 if (sas_phy_add(phy->phy)) {
213 sas_phy_free(phy->phy);
214 return;
215 }
2908d778
JB		 216
217 SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
218 SAS_ADDR(dev->sas_addr), phy->phy_id,
219 phy->routing_attr == TABLE_ROUTING ? 'T' :
220 phy->routing_attr == DIRECT_ROUTING ? 'D' :
221 phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
222 SAS_ADDR(phy->attached_sas_addr));
223
224 return;
225}
226
227#define DISCOVER_REQ_SIZE 16
228#define DISCOVER_RESP_SIZE 56
229
1acce194
JB		 230static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
231 u8 *disc_resp, int single)
232{
233 int i, res;
234
235 disc_req[9] = single;
236 for (i = 1 ; i < 3; i++) {
237 struct discover_resp *dr;
238
239 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
240 disc_resp, DISCOVER_RESP_SIZE);
241 if (res)
242 return res;
25985edc 243 /* This is detecting a failure to transmit initial
1acce194
JB		 244 * dev to host FIS as described in section G.5 of
245 * sas-2 r 04b */
246 dr = &((struct smp_resp *)disc_resp)->disc;
183ce896 247 if (memcmp(dev->sas_addr, dr->attached_sas_addr,
248 SAS_ADDR_SIZE) == 0) {
249 sas_printk("Found loopback topology, just ignore it!\n");
250 return 0;
251 }
1acce194
JB		 252 if (!(dr->attached_dev_type == 0 &&
253 dr->attached_sata_dev))
254 break;
255 /* In order to generate the dev to host FIS, we
256 * send a link reset to the expander port */
38e2f035 257 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
1acce194
JB		 258 /* Wait for the reset to trigger the negotiation */
259 msleep(500);
260 }
261 sas_set_ex_phy(dev, single, disc_resp);
262 return 0;
263}
264
2908d778
JB		 265static int sas_ex_phy_discover(struct domain_device *dev, int single)
266{
267 struct expander_device *ex = &dev->ex_dev;
268 int res = 0;
269 u8 *disc_req;
270 u8 *disc_resp;
271
272 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
273 if (!disc_req)
274 return -ENOMEM;
275
276 disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
277 if (!disc_resp) {
278 kfree(disc_req);
279 return -ENOMEM;
280 }
281
282 disc_req[1] = SMP_DISCOVER;
283
284 if (0 <= single && single < ex->num_phys) {
1acce194 285 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
2908d778
JB		 286 } else {
287 int i;
288
289 for (i = 0; i < ex->num_phys; i++) {
1acce194
JB		 290 res = sas_ex_phy_discover_helper(dev, disc_req,
291 disc_resp, i);
2908d778
JB		 292 if (res)
293 goto out_err;
2908d778
JB		 294 }
295 }
296out_err:
297 kfree(disc_resp);
298 kfree(disc_req);
299 return res;
300}
301
302static int sas_expander_discover(struct domain_device *dev)
303{
304 struct expander_device *ex = &dev->ex_dev;
305 int res = -ENOMEM;
306
307 ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
308 if (!ex->ex_phy)
309 return -ENOMEM;
310
311 res = sas_ex_phy_discover(dev, -1);
312 if (res)
313 goto out_err;
314
315 return 0;
316 out_err:
317 kfree(ex->ex_phy);
318 ex->ex_phy = NULL;
319 return res;
320}
321
322#define MAX_EXPANDER_PHYS 128
323
324static void ex_assign_report_general(struct domain_device *dev,
325 struct smp_resp *resp)
326{
327 struct report_general_resp *rg = &resp->rg;
328
329 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
330 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
331 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
ffaac8f4 332 dev->ex_dev.t2t_supp = rg->t2t_supp;
2908d778
JB		 333 dev->ex_dev.conf_route_table = rg->conf_route_table;
334 dev->ex_dev.configuring = rg->configuring;
335 memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
336}
337
338#define RG_REQ_SIZE 8
339#define RG_RESP_SIZE 32
340
341static int sas_ex_general(struct domain_device *dev)
342{
343 u8 *rg_req;
344 struct smp_resp *rg_resp;
345 int res;
346 int i;
347
348 rg_req = alloc_smp_req(RG_REQ_SIZE);
349 if (!rg_req)
350 return -ENOMEM;
351
352 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
353 if (!rg_resp) {
354 kfree(rg_req);
355 return -ENOMEM;
356 }
357
358 rg_req[1] = SMP_REPORT_GENERAL;
359
360 for (i = 0; i < 5; i++) {
361 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
362 RG_RESP_SIZE);
363
364 if (res) {
365 SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
366 SAS_ADDR(dev->sas_addr), res);
367 goto out;
368 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
369 SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
370 SAS_ADDR(dev->sas_addr), rg_resp->result);
371 res = rg_resp->result;
372 goto out;
373 }
374
375 ex_assign_report_general(dev, rg_resp);
376
377 if (dev->ex_dev.configuring) {
378 SAS_DPRINTK("RG: ex %llx self-configuring...\n",
379 SAS_ADDR(dev->sas_addr));
380 schedule_timeout_interruptible(5*HZ);
381 } else
382 break;
383 }
384out:
385 kfree(rg_req);
386 kfree(rg_resp);
387 return res;
388}
389
390static void ex_assign_manuf_info(struct domain_device *dev, void
391 *_mi_resp)
392{
393 u8 *mi_resp = _mi_resp;
394 struct sas_rphy *rphy = dev->rphy;
395 struct sas_expander_device *edev = rphy_to_expander_device(rphy);
396
397 memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
398 memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
399 memcpy(edev->product_rev, mi_resp + 36,
400 SAS_EXPANDER_PRODUCT_REV_LEN);
401
402 if (mi_resp[8] & 1) {
403 memcpy(edev->component_vendor_id, mi_resp + 40,
404 SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
405 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
406 edev->component_revision_id = mi_resp[50];
407 }
408}
409
410#define MI_REQ_SIZE 8
411#define MI_RESP_SIZE 64
412
413static int sas_ex_manuf_info(struct domain_device *dev)
414{
415 u8 *mi_req;
416 u8 *mi_resp;
417 int res;
418
419 mi_req = alloc_smp_req(MI_REQ_SIZE);
420 if (!mi_req)
421 return -ENOMEM;
422
423 mi_resp = alloc_smp_resp(MI_RESP_SIZE);
424 if (!mi_resp) {
425 kfree(mi_req);
426 return -ENOMEM;
427 }
428
429 mi_req[1] = SMP_REPORT_MANUF_INFO;
430
431 res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
432 if (res) {
433 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
434 SAS_ADDR(dev->sas_addr), res);
435 goto out;
436 } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
437 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
438 SAS_ADDR(dev->sas_addr), mi_resp[2]);
439 goto out;
440 }
441
442 ex_assign_manuf_info(dev, mi_resp);
443out:
444 kfree(mi_req);
445 kfree(mi_resp);
446 return res;
447}
448
449#define PC_REQ_SIZE 44
450#define PC_RESP_SIZE 8
451
452int sas_smp_phy_control(struct domain_device *dev, int phy_id,
a01e70e5
JB		 453 enum phy_func phy_func,
454 struct sas_phy_linkrates *rates)
2908d778
JB		 455{
456 u8 *pc_req;
457 u8 *pc_resp;
458 int res;
459
460 pc_req = alloc_smp_req(PC_REQ_SIZE);
461 if (!pc_req)
462 return -ENOMEM;
463
464 pc_resp = alloc_smp_resp(PC_RESP_SIZE);
465 if (!pc_resp) {
466 kfree(pc_req);
467 return -ENOMEM;
468 }
469
470 pc_req[1] = SMP_PHY_CONTROL;
471 pc_req[9] = phy_id;
472 pc_req[10]= phy_func;
a01e70e5
JB		 473 if (rates) {
474 pc_req[32] = rates->minimum_linkrate << 4;
475 pc_req[33] = rates->maximum_linkrate << 4;
476 }
2908d778
JB		 477
478 res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
479
480 kfree(pc_resp);
481 kfree(pc_req);
482 return res;
483}
484
485static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
486{
487 struct expander_device *ex = &dev->ex_dev;
488 struct ex_phy *phy = &ex->ex_phy[phy_id];
489
a01e70e5 490 sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
88edf746 491 phy->linkrate = SAS_PHY_DISABLED;
2908d778
JB		 492}
493
494static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
495{
496 struct expander_device *ex = &dev->ex_dev;
497 int i;
498
499 for (i = 0; i < ex->num_phys; i++) {
500 struct ex_phy *phy = &ex->ex_phy[i];
501
502 if (phy->phy_state == PHY_VACANT ||
503 phy->phy_state == PHY_NOT_PRESENT)
504 continue;
505
506 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
507 sas_ex_disable_phy(dev, i);
508 }
509}
510
511static int sas_dev_present_in_domain(struct asd_sas_port *port,
512 u8 *sas_addr)
513{
514 struct domain_device *dev;
515
516 if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
517 return 1;
518 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
519 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
520 return 1;
521 }
522 return 0;
523}
524
525#define RPEL_REQ_SIZE 16
526#define RPEL_RESP_SIZE 32
527int sas_smp_get_phy_events(struct sas_phy *phy)
528{
529 int res;
92631fa4
JJ		 530 u8 *req;
531 u8 *resp;
2908d778
JB		 532 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
533 struct domain_device *dev = sas_find_dev_by_rphy(rphy);
2908d778 534
92631fa4
JJ		 535 req = alloc_smp_req(RPEL_REQ_SIZE);
536 if (!req)
2908d778
JB		 537 return -ENOMEM;
538
92631fa4
JJ		 539 resp = alloc_smp_resp(RPEL_RESP_SIZE);
540 if (!resp) {
541 kfree(req);
542 return -ENOMEM;
543 }
544
2908d778
JB		 545 req[1] = SMP_REPORT_PHY_ERR_LOG;
546 req[9] = phy->number;
547
548 res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
549 resp, RPEL_RESP_SIZE);
550
551 if (!res)
552 goto out;
553
554 phy->invalid_dword_count = scsi_to_u32(&resp[12]);
555 phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
556 phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
557 phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
558
559 out:
560 kfree(resp);
561 return res;
562
563}
564
b9142174
JB		 565#ifdef CONFIG_SCSI_SAS_ATA
566
2908d778
JB		 567#define RPS_REQ_SIZE 16
568#define RPS_RESP_SIZE 60
569
570static int sas_get_report_phy_sata(struct domain_device *dev,
571 int phy_id,
572 struct smp_resp *rps_resp)
573{
574 int res;
575 u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
1acce194 576 u8 *resp = (u8 *)rps_resp;
2908d778
JB		 577
578 if (!rps_req)
579 return -ENOMEM;
580
581 rps_req[1] = SMP_REPORT_PHY_SATA;
582 rps_req[9] = phy_id;
583
584 res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
585 rps_resp, RPS_RESP_SIZE);
586
1acce194
JB		 587 /* 0x34 is the FIS type for the D2H fis. There's a potential
588 * standards cockup here. sas-2 explicitly specifies the FIS
589 * should be encoded so that FIS type is in resp[24].
590 * However, some expanders endian reverse this. Undo the
591 * reversal here */
592 if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
593 int i;
594
595 for (i = 0; i < 5; i++) {
596 int j = 24 + (i*4);
597 u8 a, b;
598 a = resp[j + 0];
599 b = resp[j + 1];
600 resp[j + 0] = resp[j + 3];
601 resp[j + 1] = resp[j + 2];
602 resp[j + 2] = b;
603 resp[j + 3] = a;
604 }
605 }
606
2908d778 607 kfree(rps_req);
1acce194 608 return res;
2908d778 609}
b9142174 610#endif
2908d778
JB		 611
612static void sas_ex_get_linkrate(struct domain_device *parent,
613 struct domain_device *child,
614 struct ex_phy *parent_phy)
615{
616 struct expander_device *parent_ex = &parent->ex_dev;
617 struct sas_port *port;
618 int i;
619
620 child->pathways = 0;
621
622 port = parent_phy->port;
623
624 for (i = 0; i < parent_ex->num_phys; i++) {
625 struct ex_phy *phy = &parent_ex->ex_phy[i];
626
627 if (phy->phy_state == PHY_VACANT ||
628 phy->phy_state == PHY_NOT_PRESENT)
629 continue;
630
631 if (SAS_ADDR(phy->attached_sas_addr) ==
632 SAS_ADDR(child->sas_addr)) {
633
634 child->min_linkrate = min(parent->min_linkrate,
635 phy->linkrate);
636 child->max_linkrate = max(parent->max_linkrate,
637 phy->linkrate);
638 child->pathways++;
639 sas_port_add_phy(port, phy->phy);
640 }
641 }
642 child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
643 child->pathways = min(child->pathways, parent->pathways);
644}
645
646static struct domain_device *sas_ex_discover_end_dev(
647 struct domain_device *parent, int phy_id)
648{
649 struct expander_device *parent_ex = &parent->ex_dev;
650 struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
651 struct domain_device *child = NULL;
652 struct sas_rphy *rphy;
653 int res;
654
655 if (phy->attached_sata_host || phy->attached_sata_ps)
656 return NULL;
657
658 child = kzalloc(sizeof(*child), GFP_KERNEL);
659 if (!child)
660 return NULL;
661
662 child->parent = parent;
663 child->port = parent->port;
664 child->iproto = phy->attached_iproto;
665 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
666 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
024879ea
JB		 667 if (!phy->port) {
668 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
669 if (unlikely(!phy->port))
670 goto out_err;
671 if (unlikely(sas_port_add(phy->port) != 0)) {
672 sas_port_free(phy->port);
673 goto out_err;
674 }
675 }
2908d778
JB		 676 sas_ex_get_linkrate(parent, child, phy);
677
b9142174 678#ifdef CONFIG_SCSI_SAS_ATA
5929faf3 679 if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
2908d778 680 child->dev_type = SATA_DEV;
5929faf3 681 if (phy->attached_tproto & SAS_PROTOCOL_STP)
2908d778
JB		 682 child->tproto = phy->attached_tproto;
683 if (phy->attached_sata_dev)
684 child->tproto |= SATA_DEV;
685 res = sas_get_report_phy_sata(parent, phy_id,
686 &child->sata_dev.rps_resp);
687 if (res) {
688 SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
689 "0x%x\n", SAS_ADDR(parent->sas_addr),
690 phy_id, res);
024879ea 691 goto out_free;
2908d778
JB		 692 }
693 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
694 sizeof(struct dev_to_host_fis));
1acce194
JB		 695
696 rphy = sas_end_device_alloc(phy->port);
528fd552
JB		 697 if (unlikely(!rphy))
698 goto out_free;
1acce194 699
2908d778 700 sas_init_dev(child);
1acce194
JB		 701
702 child->rphy = rphy;
703
9d720d82 704 spin_lock_irq(&parent->port->dev_list_lock);
1acce194 705 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 706 spin_unlock_irq(&parent->port->dev_list_lock);
1acce194 707
2908d778
JB		 708 res = sas_discover_sata(child);
709 if (res) {
710 SAS_DPRINTK("sas_discover_sata() for device %16llx at "
711 "%016llx:0x%x returned 0x%x\n",
712 SAS_ADDR(child->sas_addr),
713 SAS_ADDR(parent->sas_addr), phy_id, res);
1acce194 714 goto out_list_del;
2908d778 715 }
b9142174
JB		 716 } else
717#endif
5929faf3 718 if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
2908d778
JB		 719 child->dev_type = SAS_END_DEV;
720 rphy = sas_end_device_alloc(phy->port);
721 /* FIXME: error handling */
024879ea
JB		 722 if (unlikely(!rphy))
723 goto out_free;
2908d778
JB		 724 child->tproto = phy->attached_tproto;
725 sas_init_dev(child);
726
727 child->rphy = rphy;
728 sas_fill_in_rphy(child, rphy);
729
9d720d82 730 spin_lock_irq(&parent->port->dev_list_lock);
2908d778 731 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 732 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 733
734 res = sas_discover_end_dev(child);
735 if (res) {
736 SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
737 "at %016llx:0x%x returned 0x%x\n",
738 SAS_ADDR(child->sas_addr),
739 SAS_ADDR(parent->sas_addr), phy_id, res);
024879ea 740 goto out_list_del;
2908d778
JB		 741 }
742 } else {
743 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
744 phy->attached_tproto, SAS_ADDR(parent->sas_addr),
745 phy_id);
b9142174 746 goto out_free;
2908d778
JB		 747 }
748
749 list_add_tail(&child->siblings, &parent_ex->children);
750 return child;
024879ea
JB		 751
752 out_list_del:
6f63caae
DW		 753 sas_rphy_free(child->rphy);
754 child->rphy = NULL;
024879ea 755 list_del(&child->dev_list_node);
024879ea
JB		 756 out_free:
757 sas_port_delete(phy->port);
758 out_err:
759 phy->port = NULL;
760 kfree(child);
761 return NULL;
2908d778
JB		 762}
763
423f7cf4
DW		 764/* See if this phy is part of a wide port */
765static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
766{
767 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
768 int i;
769
770 for (i = 0; i < parent->ex_dev.num_phys; i++) {
771 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
772
773 if (ephy == phy)
774 continue;
775
776 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
777 SAS_ADDR_SIZE) && ephy->port) {
778 sas_port_add_phy(ephy->port, phy->phy);
19252de6 779 phy->port = ephy->port;
423f7cf4
DW		 780 phy->phy_state = PHY_DEVICE_DISCOVERED;
781 return 0;
782 }
783 }
784
785 return -ENODEV;
786}
787
2908d778
JB		 788static struct domain_device *sas_ex_discover_expander(
789 struct domain_device *parent, int phy_id)
790{
791 struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
792 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
793 struct domain_device *child = NULL;
794 struct sas_rphy *rphy;
795 struct sas_expander_device *edev;
796 struct asd_sas_port *port;
797 int res;
798
799 if (phy->routing_attr == DIRECT_ROUTING) {
800 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
801 "allowed\n",
802 SAS_ADDR(parent->sas_addr), phy_id,
803 SAS_ADDR(phy->attached_sas_addr),
804 phy->attached_phy_id);
805 return NULL;
806 }
807 child = kzalloc(sizeof(*child), GFP_KERNEL);
808 if (!child)
809 return NULL;
810
811 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
812 /* FIXME: better error handling */
813 BUG_ON(sas_port_add(phy->port) != 0);
814
815
816 switch (phy->attached_dev_type) {
817 case EDGE_DEV:
818 rphy = sas_expander_alloc(phy->port,
819 SAS_EDGE_EXPANDER_DEVICE);
820 break;
821 case FANOUT_DEV:
822 rphy = sas_expander_alloc(phy->port,
823 SAS_FANOUT_EXPANDER_DEVICE);
824 break;
825 default:
826 rphy = NULL; /* shut gcc up */
827 BUG();
828 }
829 port = parent->port;
830 child->rphy = rphy;
831 edev = rphy_to_expander_device(rphy);
832 child->dev_type = phy->attached_dev_type;
833 child->parent = parent;
834 child->port = port;
835 child->iproto = phy->attached_iproto;
836 child->tproto = phy->attached_tproto;
837 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
838 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
839 sas_ex_get_linkrate(parent, child, phy);
840 edev->level = parent_ex->level + 1;
841 parent->port->disc.max_level = max(parent->port->disc.max_level,
842 edev->level);
843 sas_init_dev(child);
844 sas_fill_in_rphy(child, rphy);
845 sas_rphy_add(rphy);
846
9d720d82 847 spin_lock_irq(&parent->port->dev_list_lock);
2908d778 848 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 849 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 850
851 res = sas_discover_expander(child);
852 if (res) {
5911e963
LT		 853 spin_lock_irq(&parent->port->dev_list_lock);
854 list_del(&child->dev_list_node);
855 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 856 kfree(child);
857 return NULL;
858 }
859 list_add_tail(&child->siblings, &parent->ex_dev.children);
860 return child;
861}
862
863static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
864{
865 struct expander_device *ex = &dev->ex_dev;
866 struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
867 struct domain_device *child = NULL;
868 int res = 0;
869
870 /* Phy state */
88edf746 871 if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
a01e70e5 872 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
2908d778
JB		 873 res = sas_ex_phy_discover(dev, phy_id);
874 if (res)
875 return res;
876 }
877
878 /* Parent and domain coherency */
879 if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
880 SAS_ADDR(dev->port->sas_addr))) {
881 sas_add_parent_port(dev, phy_id);
882 return 0;
883 }
884 if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
885 SAS_ADDR(dev->parent->sas_addr))) {
886 sas_add_parent_port(dev, phy_id);
887 if (ex_phy->routing_attr == TABLE_ROUTING)
888 sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
889 return 0;
890 }
891
892 if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
893 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
894
895 if (ex_phy->attached_dev_type == NO_DEVICE) {
896 if (ex_phy->routing_attr == DIRECT_ROUTING) {
897 memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
898 sas_configure_routing(dev, ex_phy->attached_sas_addr);
899 }
900 return 0;
88edf746 901 } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
2908d778
JB		 902 return 0;
903
904 if (ex_phy->attached_dev_type != SAS_END_DEV &&
905 ex_phy->attached_dev_type != FANOUT_DEV &&
906 ex_phy->attached_dev_type != EDGE_DEV) {
907 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
908 "phy 0x%x\n", ex_phy->attached_dev_type,
909 SAS_ADDR(dev->sas_addr),
910 phy_id);
911 return 0;
912 }
913
914 res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
915 if (res) {
916 SAS_DPRINTK("configure routing for dev %016llx "
917 "reported 0x%x. Forgotten\n",
918 SAS_ADDR(ex_phy->attached_sas_addr), res);
919 sas_disable_routing(dev, ex_phy->attached_sas_addr);
920 return res;
921 }
922
423f7cf4
DW		 923 res = sas_ex_join_wide_port(dev, phy_id);
924 if (!res) {
925 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
926 phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
927 return res;
928 }
929
2908d778
JB		 930 switch (ex_phy->attached_dev_type) {
931 case SAS_END_DEV:
932 child = sas_ex_discover_end_dev(dev, phy_id);
933 break;
934 case FANOUT_DEV:
935 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
936 SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
937 "attached to ex %016llx phy 0x%x\n",
938 SAS_ADDR(ex_phy->attached_sas_addr),
939 ex_phy->attached_phy_id,
940 SAS_ADDR(dev->sas_addr),
941 phy_id);
942 sas_ex_disable_phy(dev, phy_id);
943 break;
944 } else
945 memcpy(dev->port->disc.fanout_sas_addr,
946 ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
947 /* fallthrough */
948 case EDGE_DEV:
949 child = sas_ex_discover_expander(dev, phy_id);
950 break;
951 default:
952 break;
953 }
954
955 if (child) {
956 int i;
957
958 for (i = 0; i < ex->num_phys; i++) {
959 if (ex->ex_phy[i].phy_state == PHY_VACANT ||
960 ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
961 continue;
19252de6
TP		 962 /*
963 * Due to races, the phy might not get added to the
964 * wide port, so we add the phy to the wide port here.
965 */
2908d778 966 if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
19252de6 967 SAS_ADDR(child->sas_addr)) {
2908d778 968 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
19252de6
TP		 969 res = sas_ex_join_wide_port(dev, i);
970 if (!res)
971 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
972 i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
973
974 }
2908d778
JB		 975 }
976 }
977
978 return res;
979}
980
981static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
982{
983 struct expander_device *ex = &dev->ex_dev;
984 int i;
985
986 for (i = 0; i < ex->num_phys; i++) {
987 struct ex_phy *phy = &ex->ex_phy[i];
988
989 if (phy->phy_state == PHY_VACANT ||
990 phy->phy_state == PHY_NOT_PRESENT)
991 continue;
992
993 if ((phy->attached_dev_type == EDGE_DEV ||
994 phy->attached_dev_type == FANOUT_DEV) &&
995 phy->routing_attr == SUBTRACTIVE_ROUTING) {
996
997 memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
998
999 return 1;
1000 }
1001 }
1002 return 0;
1003}
1004
1005static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1006{
1007 struct expander_device *ex = &dev->ex_dev;
1008 struct domain_device *child;
1009 u8 sub_addr[8] = {0, };
1010
1011 list_for_each_entry(child, &ex->children, siblings) {
1012 if (child->dev_type != EDGE_DEV &&
1013 child->dev_type != FANOUT_DEV)
1014 continue;
1015 if (sub_addr[0] == 0) {
1016 sas_find_sub_addr(child, sub_addr);
1017 continue;
1018 } else {
1019 u8 s2[8];
1020
1021 if (sas_find_sub_addr(child, s2) &&
1022 (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1023
1024 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1025 "diverges from subtractive "
1026 "boundary %016llx\n",
1027 SAS_ADDR(dev->sas_addr),
1028 SAS_ADDR(child->sas_addr),
1029 SAS_ADDR(s2),
1030 SAS_ADDR(sub_addr));
1031
1032 sas_ex_disable_port(child, s2);
1033 }
1034 }
1035 }
1036 return 0;
1037}
1038/**
1039 * sas_ex_discover_devices -- discover devices attached to this expander
1040 * dev: pointer to the expander domain device
1041 * single: if you want to do a single phy, else set to -1;
1042 *
1043 * Configure this expander for use with its devices and register the
1044 * devices of this expander.
1045 */
1046static int sas_ex_discover_devices(struct domain_device *dev, int single)
1047{
1048 struct expander_device *ex = &dev->ex_dev;
1049 int i = 0, end = ex->num_phys;
1050 int res = 0;
1051
1052 if (0 <= single && single < end) {
1053 i = single;
1054 end = i+1;
1055 }
1056
1057 for ( ; i < end; i++) {
1058 struct ex_phy *ex_phy = &ex->ex_phy[i];
1059
1060 if (ex_phy->phy_state == PHY_VACANT ||
1061 ex_phy->phy_state == PHY_NOT_PRESENT ||
1062 ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1063 continue;
1064
1065 switch (ex_phy->linkrate) {
88edf746
JB		 1066 case SAS_PHY_DISABLED:
1067 case SAS_PHY_RESET_PROBLEM:
1068 case SAS_SATA_PORT_SELECTOR:
2908d778
JB		 1069 continue;
1070 default:
1071 res = sas_ex_discover_dev(dev, i);
1072 if (res)
1073 break;
1074 continue;
1075 }
1076 }
1077
1078 if (!res)
1079 sas_check_level_subtractive_boundary(dev);
1080
1081 return res;
1082}
1083
1084static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1085{
1086 struct expander_device *ex = &dev->ex_dev;
1087 int i;
1088 u8 *sub_sas_addr = NULL;
1089
1090 if (dev->dev_type != EDGE_DEV)
1091 return 0;
1092
1093 for (i = 0; i < ex->num_phys; i++) {
1094 struct ex_phy *phy = &ex->ex_phy[i];
1095
1096 if (phy->phy_state == PHY_VACANT ||
1097 phy->phy_state == PHY_NOT_PRESENT)
1098 continue;
1099
1100 if ((phy->attached_dev_type == FANOUT_DEV ||
1101 phy->attached_dev_type == EDGE_DEV) &&
1102 phy->routing_attr == SUBTRACTIVE_ROUTING) {
1103
1104 if (!sub_sas_addr)
1105 sub_sas_addr = &phy->attached_sas_addr[0];
1106 else if (SAS_ADDR(sub_sas_addr) !=
1107 SAS_ADDR(phy->attached_sas_addr)) {
1108
1109 SAS_DPRINTK("ex %016llx phy 0x%x "
1110 "diverges(%016llx) on subtractive "
1111 "boundary(%016llx). Disabled\n",
1112 SAS_ADDR(dev->sas_addr), i,
1113 SAS_ADDR(phy->attached_sas_addr),
1114 SAS_ADDR(sub_sas_addr));
1115 sas_ex_disable_phy(dev, i);
1116 }
1117 }
1118 }
1119 return 0;
1120}
1121
1122static void sas_print_parent_topology_bug(struct domain_device *child,
1123 struct ex_phy *parent_phy,
1124 struct ex_phy *child_phy)
1125{
1126 static const char ra_char[] = {
1127 [DIRECT_ROUTING] = 'D',
1128 [SUBTRACTIVE_ROUTING] = 'S',
1129 [TABLE_ROUTING] = 'T',
1130 };
1131 static const char *ex_type[] = {
1132 [EDGE_DEV] = "edge",
1133 [FANOUT_DEV] = "fanout",
1134 };
1135 struct domain_device *parent = child->parent;
1136
ffaac8f4
LT		 1137 sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
1138 "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
2908d778
JB		 1139
1140 ex_type[parent->dev_type],
1141 SAS_ADDR(parent->sas_addr),
ffaac8f4 1142 parent->ex_dev.t2t_supp,
2908d778
JB		 1143 parent_phy->phy_id,
1144
1145 ex_type[child->dev_type],
1146 SAS_ADDR(child->sas_addr),
ffaac8f4 1147 child->ex_dev.t2t_supp,
2908d778
JB		 1148 child_phy->phy_id,
1149
1150 ra_char[parent_phy->routing_attr],
1151 ra_char[child_phy->routing_attr]);
1152}
1153
1154static int sas_check_eeds(struct domain_device *child,
1155 struct ex_phy *parent_phy,
1156 struct ex_phy *child_phy)
1157{
1158 int res = 0;
1159 struct domain_device *parent = child->parent;
1160
1161 if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1162 res = -ENODEV;
1163 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1164 "phy S:0x%x, while there is a fanout ex %016llx\n",
1165 SAS_ADDR(parent->sas_addr),
1166 parent_phy->phy_id,
1167 SAS_ADDR(child->sas_addr),
1168 child_phy->phy_id,
1169 SAS_ADDR(parent->port->disc.fanout_sas_addr));
1170 } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1171 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1172 SAS_ADDR_SIZE);
1173 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1174 SAS_ADDR_SIZE);
1175 } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1176 SAS_ADDR(parent->sas_addr)) ||
1177 (SAS_ADDR(parent->port->disc.eeds_a) ==
1178 SAS_ADDR(child->sas_addr)))
1179 &&
1180 ((SAS_ADDR(parent->port->disc.eeds_b) ==
1181 SAS_ADDR(parent->sas_addr)) ||
1182 (SAS_ADDR(parent->port->disc.eeds_b) ==
1183 SAS_ADDR(child->sas_addr))))
1184 ;
1185 else {
1186 res = -ENODEV;
1187 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1188 "phy 0x%x link forms a third EEDS!\n",
1189 SAS_ADDR(parent->sas_addr),
1190 parent_phy->phy_id,
1191 SAS_ADDR(child->sas_addr),
1192 child_phy->phy_id);
1193 }
1194
1195 return res;
1196}
1197
1198/* Here we spill over 80 columns. It is intentional.
1199 */
1200static int sas_check_parent_topology(struct domain_device *child)
1201{
1202 struct expander_device *child_ex = &child->ex_dev;
1203 struct expander_device *parent_ex;
1204 int i;
1205 int res = 0;
1206
1207 if (!child->parent)
1208 return 0;
1209
1210 if (child->parent->dev_type != EDGE_DEV &&
1211 child->parent->dev_type != FANOUT_DEV)
1212 return 0;
1213
1214 parent_ex = &child->parent->ex_dev;
1215
1216 for (i = 0; i < parent_ex->num_phys; i++) {
1217 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1218 struct ex_phy *child_phy;
1219
1220 if (parent_phy->phy_state == PHY_VACANT ||
1221 parent_phy->phy_state == PHY_NOT_PRESENT)
1222 continue;
1223
1224 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1225 continue;
1226
1227 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1228
1229 switch (child->parent->dev_type) {
1230 case EDGE_DEV:
1231 if (child->dev_type == FANOUT_DEV) {
1232 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1233 child_phy->routing_attr != TABLE_ROUTING) {
1234 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1235 res = -ENODEV;
1236 }
1237 } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1238 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1239 res = sas_check_eeds(child, parent_phy, child_phy);
1240 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1241 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1242 res = -ENODEV;
1243 }
ffaac8f4
LT		 1244 } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1245 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1246 (child_phy->routing_attr == TABLE_ROUTING &&
1247 child_ex->t2t_supp && parent_ex->t2t_supp)) {
1248 /* All good */;
1249 } else {
1250 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1251 res = -ENODEV;
1252 }
2908d778
JB		 1253 }
1254 break;
1255 case FANOUT_DEV:
1256 if (parent_phy->routing_attr != TABLE_ROUTING ||
1257 child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1258 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1259 res = -ENODEV;
1260 }
1261 break;
1262 default:
1263 break;
1264 }
1265 }
1266
1267 return res;
1268}
1269
1270#define RRI_REQ_SIZE 16
1271#define RRI_RESP_SIZE 44
1272
1273static int sas_configure_present(struct domain_device *dev, int phy_id,
1274 u8 *sas_addr, int *index, int *present)
1275{
1276 int i, res = 0;
1277 struct expander_device *ex = &dev->ex_dev;
1278 struct ex_phy *phy = &ex->ex_phy[phy_id];
1279 u8 *rri_req;
1280 u8 *rri_resp;
1281
1282 *present = 0;
1283 *index = 0;
1284
1285 rri_req = alloc_smp_req(RRI_REQ_SIZE);
1286 if (!rri_req)
1287 return -ENOMEM;
1288
1289 rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1290 if (!rri_resp) {
1291 kfree(rri_req);
1292 return -ENOMEM;
1293 }
1294
1295 rri_req[1] = SMP_REPORT_ROUTE_INFO;
1296 rri_req[9] = phy_id;
1297
1298 for (i = 0; i < ex->max_route_indexes ; i++) {
1299 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1300 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1301 RRI_RESP_SIZE);
1302 if (res)
1303 goto out;
1304 res = rri_resp[2];
1305 if (res == SMP_RESP_NO_INDEX) {
1306 SAS_DPRINTK("overflow of indexes: dev %016llx "
1307 "phy 0x%x index 0x%x\n",
1308 SAS_ADDR(dev->sas_addr), phy_id, i);
1309 goto out;
1310 } else if (res != SMP_RESP_FUNC_ACC) {
1311 SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
cadbd4a5 1312 "result 0x%x\n", __func__,
2908d778
JB		 1313 SAS_ADDR(dev->sas_addr), phy_id, i, res);
1314 goto out;
1315 }
1316 if (SAS_ADDR(sas_addr) != 0) {
1317 if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1318 *index = i;
1319 if ((rri_resp[12] & 0x80) == 0x80)
1320 *present = 0;
1321 else
1322 *present = 1;
1323 goto out;
1324 } else if (SAS_ADDR(rri_resp+16) == 0) {
1325 *index = i;
1326 *present = 0;
1327 goto out;
1328 }
1329 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1330 phy->last_da_index < i) {
1331 phy->last_da_index = i;
1332 *index = i;
1333 *present = 0;
1334 goto out;
1335 }
1336 }
1337 res = -1;
1338out:
1339 kfree(rri_req);
1340 kfree(rri_resp);
1341 return res;
1342}
1343
1344#define CRI_REQ_SIZE 44
1345#define CRI_RESP_SIZE 8
1346
1347static int sas_configure_set(struct domain_device *dev, int phy_id,
1348 u8 *sas_addr, int index, int include)
1349{
1350 int res;
1351 u8 *cri_req;
1352 u8 *cri_resp;
1353
1354 cri_req = alloc_smp_req(CRI_REQ_SIZE);
1355 if (!cri_req)
1356 return -ENOMEM;
1357
1358 cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1359 if (!cri_resp) {
1360 kfree(cri_req);
1361 return -ENOMEM;
1362 }
1363
1364 cri_req[1] = SMP_CONF_ROUTE_INFO;
1365 *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1366 cri_req[9] = phy_id;
1367 if (SAS_ADDR(sas_addr) == 0 || !include)
1368 cri_req[12] |= 0x80;
1369 memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1370
1371 res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1372 CRI_RESP_SIZE);
1373 if (res)
1374 goto out;
1375 res = cri_resp[2];
1376 if (res == SMP_RESP_NO_INDEX) {
1377 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1378 "index 0x%x\n",
1379 SAS_ADDR(dev->sas_addr), phy_id, index);
1380 }
1381out:
1382 kfree(cri_req);
1383 kfree(cri_resp);
1384 return res;
1385}
1386
1387static int sas_configure_phy(struct domain_device *dev, int phy_id,
1388 u8 *sas_addr, int include)
1389{
1390 int index;
1391 int present;
1392 int res;
1393
1394 res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1395 if (res)
1396 return res;
1397 if (include ^ present)
1398 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1399
1400 return res;
1401}
1402
1403/**
1404 * sas_configure_parent -- configure routing table of parent
1405 * parent: parent expander
1406 * child: child expander
1407 * sas_addr: SAS port identifier of device directly attached to child
1408 */
1409static int sas_configure_parent(struct domain_device *parent,
1410 struct domain_device *child,
1411 u8 *sas_addr, int include)
1412{
1413 struct expander_device *ex_parent = &parent->ex_dev;
1414 int res = 0;
1415 int i;
1416
1417 if (parent->parent) {
1418 res = sas_configure_parent(parent->parent, parent, sas_addr,
1419 include);
1420 if (res)
1421 return res;
1422 }
1423
1424 if (ex_parent->conf_route_table == 0) {
1425 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1426 SAS_ADDR(parent->sas_addr));
1427 return 0;
1428 }
1429
1430 for (i = 0; i < ex_parent->num_phys; i++) {
1431 struct ex_phy *phy = &ex_parent->ex_phy[i];
1432
1433 if ((phy->routing_attr == TABLE_ROUTING) &&
1434 (SAS_ADDR(phy->attached_sas_addr) ==
1435 SAS_ADDR(child->sas_addr))) {
1436 res = sas_configure_phy(parent, i, sas_addr, include);
1437 if (res)
1438 return res;
1439 }
1440 }
1441
1442 return res;
1443}
1444
1445/**
1446 * sas_configure_routing -- configure routing
1447 * dev: expander device
1448 * sas_addr: port identifier of device directly attached to the expander device
1449 */
1450static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1451{
1452 if (dev->parent)
1453 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1454 return 0;
1455}
1456
1457static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr)
1458{
1459 if (dev->parent)
1460 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1461 return 0;
1462}
1463
2908d778
JB		 1464/**
1465 * sas_discover_expander -- expander discovery
1466 * @ex: pointer to expander domain device
1467 *
1468 * See comment in sas_discover_sata().
1469 */
1470static int sas_discover_expander(struct domain_device *dev)
1471{
1472 int res;
1473
1474 res = sas_notify_lldd_dev_found(dev);
1475 if (res)
1476 return res;
1477
1478 res = sas_ex_general(dev);
1479 if (res)
1480 goto out_err;
1481 res = sas_ex_manuf_info(dev);
1482 if (res)
1483 goto out_err;
1484
1485 res = sas_expander_discover(dev);
1486 if (res) {
1487 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1488 SAS_ADDR(dev->sas_addr), res);
1489 goto out_err;
1490 }
1491
1492 sas_check_ex_subtractive_boundary(dev);
1493 res = sas_check_parent_topology(dev);
1494 if (res)
1495 goto out_err;
1496 return 0;
1497out_err:
1498 sas_notify_lldd_dev_gone(dev);
1499 return res;
1500}
1501
1502static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1503{
1504 int res = 0;
1505 struct domain_device *dev;
1506
1507 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1508 if (dev->dev_type == EDGE_DEV ||
1509 dev->dev_type == FANOUT_DEV) {
1510 struct sas_expander_device *ex =
1511 rphy_to_expander_device(dev->rphy);
1512
1513 if (level == ex->level)
1514 res = sas_ex_discover_devices(dev, -1);
1515 else if (level > 0)
1516 res = sas_ex_discover_devices(port->port_dev, -1);
1517
1518 }
1519 }
1520
1521 return res;
1522}
1523
1524static int sas_ex_bfs_disc(struct asd_sas_port *port)
1525{
1526 int res;
1527 int level;
1528
1529 do {
1530 level = port->disc.max_level;
1531 res = sas_ex_level_discovery(port, level);
1532 mb();
1533 } while (level < port->disc.max_level);
1534
1535 return res;
1536}
1537
1538int sas_discover_root_expander(struct domain_device *dev)
1539{
1540 int res;
1541 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1542
bf451207
DW		 1543 res = sas_rphy_add(dev->rphy);
1544 if (res)
1545 goto out_err;
2908d778
JB		 1546
1547 ex->level = dev->port->disc.max_level; /* 0 */
1548 res = sas_discover_expander(dev);
bf451207
DW		 1549 if (res)
1550 goto out_err2;
1551
1552 sas_ex_bfs_disc(dev->port);
2908d778
JB		 1553
1554 return res;
bf451207
DW		 1555
1556out_err2:
6f63caae 1557 sas_rphy_remove(dev->rphy);
bf451207 1558out_err:
bf451207 1559 return res;
2908d778
JB		 1560}
1561
1562/* ---------- Domain revalidation ---------- */
1563
1564static int sas_get_phy_discover(struct domain_device *dev,
1565 int phy_id, struct smp_resp *disc_resp)
1566{
1567 int res;
1568 u8 *disc_req;
1569
1570 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1571 if (!disc_req)
1572 return -ENOMEM;
1573
1574 disc_req[1] = SMP_DISCOVER;
1575 disc_req[9] = phy_id;
1576
1577 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1578 disc_resp, DISCOVER_RESP_SIZE);
1579 if (res)
1580 goto out;
1581 else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1582 res = disc_resp->result;
1583 goto out;
1584 }
1585out:
1586 kfree(disc_req);
1587 return res;
1588}
1589
1590static int sas_get_phy_change_count(struct domain_device *dev,
1591 int phy_id, int *pcc)
1592{
1593 int res;
1594 struct smp_resp *disc_resp;
1595
1596 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1597 if (!disc_resp)
1598 return -ENOMEM;
1599
1600 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1601 if (!res)
1602 *pcc = disc_resp->disc.change_count;
1603
1604 kfree(disc_resp);
1605 return res;
1606}
1607
1608static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1609 int phy_id, u8 *attached_sas_addr)
1610{
1611 int res;
1612 struct smp_resp *disc_resp;
1613 struct discover_resp *dr;
1614
1615 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1616 if (!disc_resp)
1617 return -ENOMEM;
1618 dr = &disc_resp->disc;
1619
1620 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1621 if (!res) {
1622 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1623 if (dr->attached_dev_type == 0)
1624 memset(attached_sas_addr, 0, 8);
1625 }
1626 kfree(disc_resp);
1627 return res;
1628}
1629
1630static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
19252de6 1631 int from_phy, bool update)
2908d778
JB		 1632{
1633 struct expander_device *ex = &dev->ex_dev;
1634 int res = 0;
1635 int i;
1636
1637 for (i = from_phy; i < ex->num_phys; i++) {
1638 int phy_change_count = 0;
1639
1640 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1641 if (res)
1642 goto out;
1643 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
19252de6
TP		 1644 if (update)
1645 ex->ex_phy[i].phy_change_count =
1646 phy_change_count;
2908d778
JB		 1647 *phy_id = i;
1648 return 0;
1649 }
1650 }
1651out:
1652 return res;
1653}
1654
1655static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1656{
1657 int res;
1658 u8 *rg_req;
1659 struct smp_resp *rg_resp;
1660
1661 rg_req = alloc_smp_req(RG_REQ_SIZE);
1662 if (!rg_req)
1663 return -ENOMEM;
1664
1665 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1666 if (!rg_resp) {
1667 kfree(rg_req);
1668 return -ENOMEM;
1669 }
1670
1671 rg_req[1] = SMP_REPORT_GENERAL;
1672
1673 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1674 RG_RESP_SIZE);
1675 if (res)
1676 goto out;
1677 if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1678 res = rg_resp->result;
1679 goto out;
1680 }
1681
1682 *ecc = be16_to_cpu(rg_resp->rg.change_count);
1683out:
1684 kfree(rg_resp);
1685 kfree(rg_req);
1686 return res;
1687}
19252de6
TP		 1688/**
1689 * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE).
1690 * @dev:domain device to be detect.
1691 * @src_dev: the device which originated BROADCAST(CHANGE).
1692 *
1693 * Add self-configuration expander suport. Suppose two expander cascading,
1694 * when the first level expander is self-configuring, hotplug the disks in
1695 * second level expander, BROADCAST(CHANGE) will not only be originated
1696 * in the second level expander, but also be originated in the first level
1697 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1698 * expander changed count in two level expanders will all increment at least
1699 * once, but the phy which chang count has changed is the source device which
1700 * we concerned.
1701 */
2908d778
JB		 1702
1703static int sas_find_bcast_dev(struct domain_device *dev,
1704 struct domain_device **src_dev)
1705{
1706 struct expander_device *ex = &dev->ex_dev;
1707 int ex_change_count = -1;
19252de6 1708 int phy_id = -1;
2908d778 1709 int res;
19252de6 1710 struct domain_device *ch;
2908d778
JB		 1711
1712 res = sas_get_ex_change_count(dev, &ex_change_count);
1713 if (res)
1714 goto out;
19252de6
TP		 1715 if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1716 /* Just detect if this expander phys phy change count changed,
1717 * in order to determine if this expander originate BROADCAST,
1718 * and do not update phy change count field in our structure.
1719 */
1720 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1721 if (phy_id != -1) {
1722 *src_dev = dev;
1723 ex->ex_change_count = ex_change_count;
1724 SAS_DPRINTK("Expander phy change count has changed\n");
1725 return res;
1726 } else
1727 SAS_DPRINTK("Expander phys DID NOT change\n");
1728 }
1729 list_for_each_entry(ch, &ex->children, siblings) {
1730 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1731 res = sas_find_bcast_dev(ch, src_dev);
1732 if (src_dev)
1733 return res;
2908d778
JB		 1734 }
1735 }
1736out:
1737 return res;
1738}
1739
1740static void sas_unregister_ex_tree(struct domain_device *dev)
1741{
1742 struct expander_device *ex = &dev->ex_dev;
1743 struct domain_device *child, *n;
1744
1745 list_for_each_entry_safe(child, n, &ex->children, siblings) {
56dd2c06 1746 child->gone = 1;
2908d778
JB		 1747 if (child->dev_type == EDGE_DEV ||
1748 child->dev_type == FANOUT_DEV)
1749 sas_unregister_ex_tree(child);
1750 else
1751 sas_unregister_dev(child);
1752 }
1753 sas_unregister_dev(dev);
1754}
1755
1756static void sas_unregister_devs_sas_addr(struct domain_device *parent,
19252de6 1757 int phy_id, bool last)
2908d778
JB		 1758{
1759 struct expander_device *ex_dev = &parent->ex_dev;
1760 struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1761 struct domain_device *child, *n;
19252de6
TP		 1762 if (last) {
1763 list_for_each_entry_safe(child, n,
1764 &ex_dev->children, siblings) {
1765 if (SAS_ADDR(child->sas_addr) ==
1766 SAS_ADDR(phy->attached_sas_addr)) {
56dd2c06 1767 child->gone = 1;
19252de6
TP		 1768 if (child->dev_type == EDGE_DEV ||
1769 child->dev_type == FANOUT_DEV)
1770 sas_unregister_ex_tree(child);
1771 else
1772 sas_unregister_dev(child);
1773 break;
1774 }
2908d778 1775 }
56dd2c06 1776 parent->gone = 1;
19252de6 1777 sas_disable_routing(parent, phy->attached_sas_addr);
2908d778 1778 }
2908d778
JB		 1779 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1780 sas_port_delete_phy(phy->port, phy->phy);
1781 if (phy->port->num_phys == 0)
1782 sas_port_delete(phy->port);
1783 phy->port = NULL;
1784}
1785
1786static int sas_discover_bfs_by_root_level(struct domain_device *root,
1787 const int level)
1788{
1789 struct expander_device *ex_root = &root->ex_dev;
1790 struct domain_device *child;
1791 int res = 0;
1792
1793 list_for_each_entry(child, &ex_root->children, siblings) {
1794 if (child->dev_type == EDGE_DEV ||
1795 child->dev_type == FANOUT_DEV) {
1796 struct sas_expander_device *ex =
1797 rphy_to_expander_device(child->rphy);
1798
1799 if (level > ex->level)
1800 res = sas_discover_bfs_by_root_level(child,
1801 level);
1802 else if (level == ex->level)
1803 res = sas_ex_discover_devices(child, -1);
1804 }
1805 }
1806 return res;
1807}
1808
1809static int sas_discover_bfs_by_root(struct domain_device *dev)
1810{
1811 int res;
1812 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1813 int level = ex->level+1;
1814
1815 res = sas_ex_discover_devices(dev, -1);
1816 if (res)
1817 goto out;
1818 do {
1819 res = sas_discover_bfs_by_root_level(dev, level);
1820 mb();
1821 level += 1;
1822 } while (level <= dev->port->disc.max_level);
1823out:
1824 return res;
1825}
1826
1827static int sas_discover_new(struct domain_device *dev, int phy_id)
1828{
1829 struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1830 struct domain_device *child;
19252de6
TP		 1831 bool found = false;
1832 int res, i;
2908d778
JB		 1833
1834 SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1835 SAS_ADDR(dev->sas_addr), phy_id);
1836 res = sas_ex_phy_discover(dev, phy_id);
1837 if (res)
1838 goto out;
19252de6
TP		 1839 /* to support the wide port inserted */
1840 for (i = 0; i < dev->ex_dev.num_phys; i++) {
1841 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i];
1842 if (i == phy_id)
1843 continue;
1844 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) ==
1845 SAS_ADDR(ex_phy->attached_sas_addr)) {
1846 found = true;
1847 break;
1848 }
1849 }
1850 if (found) {
1851 sas_ex_join_wide_port(dev, phy_id);
1852 return 0;
1853 }
2908d778 1854 res = sas_ex_discover_devices(dev, phy_id);
19252de6 1855 if (!res)
2908d778
JB		 1856 goto out;
1857 list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1858 if (SAS_ADDR(child->sas_addr) ==
1859 SAS_ADDR(ex_phy->attached_sas_addr)) {
1860 if (child->dev_type == EDGE_DEV ||
1861 child->dev_type == FANOUT_DEV)
1862 res = sas_discover_bfs_by_root(child);
1863 break;
1864 }
1865 }
1866out:
1867 return res;
1868}
1869
19252de6 1870static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
2908d778
JB		 1871{
1872 struct expander_device *ex = &dev->ex_dev;
1873 struct ex_phy *phy = &ex->ex_phy[phy_id];
1874 u8 attached_sas_addr[8];
1875 int res;
1876
1877 res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1878 switch (res) {
1879 case SMP_RESP_NO_PHY:
1880 phy->phy_state = PHY_NOT_PRESENT;
19252de6 1881 sas_unregister_devs_sas_addr(dev, phy_id, last);
2908d778
JB		 1882 goto out; break;
1883 case SMP_RESP_PHY_VACANT:
1884 phy->phy_state = PHY_VACANT;
19252de6 1885 sas_unregister_devs_sas_addr(dev, phy_id, last);
2908d778
JB		 1886 goto out; break;
1887 case SMP_RESP_FUNC_ACC:
1888 break;
1889 }
1890
1891 if (SAS_ADDR(attached_sas_addr) == 0) {
1892 phy->phy_state = PHY_EMPTY;
19252de6 1893 sas_unregister_devs_sas_addr(dev, phy_id, last);
2908d778
JB		 1894 } else if (SAS_ADDR(attached_sas_addr) ==
1895 SAS_ADDR(phy->attached_sas_addr)) {
1896 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1897 SAS_ADDR(dev->sas_addr), phy_id);
a01e70e5 1898 sas_ex_phy_discover(dev, phy_id);
2908d778
JB		 1899 } else
1900 res = sas_discover_new(dev, phy_id);
1901out:
1902 return res;
1903}
1904
19252de6
TP		 1905/**
1906 * sas_rediscover - revalidate the domain.
1907 * @dev:domain device to be detect.
1908 * @phy_id: the phy id will be detected.
1909 *
1910 * NOTE: this process _must_ quit (return) as soon as any connection
1911 * errors are encountered. Connection recovery is done elsewhere.
1912 * Discover process only interrogates devices in order to discover the
1913 * domain.For plugging out, we un-register the device only when it is
1914 * the last phy in the port, for other phys in this port, we just delete it
1915 * from the port.For inserting, we do discovery when it is the
1916 * first phy,for other phys in this port, we add it to the port to
1917 * forming the wide-port.
1918 */
2908d778
JB		 1919static int sas_rediscover(struct domain_device *dev, const int phy_id)
1920{
1921 struct expander_device *ex = &dev->ex_dev;
1922 struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1923 int res = 0;
1924 int i;
19252de6 1925 bool last = true; /* is this the last phy of the port */
2908d778
JB		 1926
1927 SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1928 SAS_ADDR(dev->sas_addr), phy_id);
1929
1930 if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1931 for (i = 0; i < ex->num_phys; i++) {
1932 struct ex_phy *phy = &ex->ex_phy[i];
1933
1934 if (i == phy_id)
1935 continue;
1936 if (SAS_ADDR(phy->attached_sas_addr) ==
1937 SAS_ADDR(changed_phy->attached_sas_addr)) {
1938 SAS_DPRINTK("phy%d part of wide port with "
1939 "phy%d\n", phy_id, i);
19252de6
TP		 1940 last = false;
1941 break;
2908d778
JB		 1942 }
1943 }
19252de6 1944 res = sas_rediscover_dev(dev, phy_id, last);
2908d778
JB		 1945 } else
1946 res = sas_discover_new(dev, phy_id);
2908d778
JB		 1947 return res;
1948}
1949
1950/**
1951 * sas_revalidate_domain -- revalidate the domain
1952 * @port: port to the domain of interest
1953 *
1954 * NOTE: this process _must_ quit (return) as soon as any connection
1955 * errors are encountered. Connection recovery is done elsewhere.
1956 * Discover process only interrogates devices in order to discover the
1957 * domain.
1958 */
1959int sas_ex_revalidate_domain(struct domain_device *port_dev)
1960{
1961 int res;
1962 struct domain_device *dev = NULL;
1963
1964 res = sas_find_bcast_dev(port_dev, &dev);
1965 if (res)
1966 goto out;
1967 if (dev) {
1968 struct expander_device *ex = &dev->ex_dev;
1969 int i = 0, phy_id;
1970
1971 do {
1972 phy_id = -1;
19252de6 1973 res = sas_find_bcast_phy(dev, &phy_id, i, true);
2908d778
JB		 1974 if (phy_id == -1)
1975 break;
1976 res = sas_rediscover(dev, phy_id);
1977 i = phy_id + 1;
1978 } while (i < ex->num_phys);
1979 }
1980out:
1981 return res;
1982}
1983
ba1fc175
FT		 1984int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1985 struct request *req)
1986{
1987 struct domain_device *dev;
2cd614c8 1988 int ret, type;
ba1fc175
FT		 1989 struct request *rsp = req->next_rq;
1990
1991 if (!rsp) {
1992 printk("%s: space for a smp response is missing\n",
cadbd4a5 1993 __func__);
ba1fc175
FT		 1994 return -EINVAL;
1995 }
1996
2cd614c8 1997 /* no rphy means no smp target support (ie aic94xx host) */
b98e66fa
JB		 1998 if (!rphy)
1999 return sas_smp_host_handler(shost, req, rsp);
2000
2cd614c8 2001 type = rphy->identify.device_type;
ba1fc175
FT		 2002
2003 if (type != SAS_EDGE_EXPANDER_DEVICE &&
2004 type != SAS_FANOUT_EXPANDER_DEVICE) {
2005 printk("%s: can we send a smp request to a device?\n",
cadbd4a5 2006 __func__);
ba1fc175
FT		 2007 return -EINVAL;
2008 }
2009
2010 dev = sas_find_dev_by_rphy(rphy);
2011 if (!dev) {
cadbd4a5 2012 printk("%s: fail to find a domain_device?\n", __func__);
ba1fc175
FT		 2013 return -EINVAL;
2014 }
2015
2016 /* do we need to support multiple segments? */
2017 if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2018 printk("%s: multiple segments req %u %u, rsp %u %u\n",
b0790410
TH		 2019 __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2020 rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
ba1fc175
FT		 2021 return -EINVAL;
2022 }
2023
b0790410
TH		 2024 ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2025 bio_data(rsp->bio), blk_rq_bytes(rsp));
2d4b63e1
JB		 2026 if (ret > 0) {
2027 /* positive number is the untransferred residual */
c3a4d78c 2028 rsp->resid_len = ret;
5f49f631 2029 req->resid_len = 0;
2d4b63e1 2030 ret = 0;
5f49f631
TH		 2031 } else if (ret == 0) {
2032 rsp->resid_len = 0;
2033 req->resid_len = 0;
2d4b63e1 2034 }
ba1fc175
FT		 2035
2036 return ret;
2037}
Linux kernel - Deliverables
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