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[SCSI] libsas: remove ata_port.lock management duties from lldds
[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
bb041a0e
JW		 202 phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
203 phy->phy->identify.device_type = phy->attached_dev_type;
2908d778
JB		 204 phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
205 phy->phy->identify.target_port_protocols = phy->attached_tproto;
206 phy->phy->identify.phy_identifier = phy_id;
a01e70e5
JB		 207 phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
208 phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
209 phy->phy->minimum_linkrate = dr->pmin_linkrate;
210 phy->phy->maximum_linkrate = dr->pmax_linkrate;
88edf746 211 phy->phy->negotiated_linkrate = phy->linkrate;
2908d778
JB		 212
213 if (!rediscover)
2bc72c91
JW		 214 if (sas_phy_add(phy->phy)) {
215 sas_phy_free(phy->phy);
216 return;
217 }
2908d778
JB		 218
219 SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
220 SAS_ADDR(dev->sas_addr), phy->phy_id,
221 phy->routing_attr == TABLE_ROUTING ? 'T' :
222 phy->routing_attr == DIRECT_ROUTING ? 'D' :
223 phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
224 SAS_ADDR(phy->attached_sas_addr));
225
226 return;
227}
228
229#define DISCOVER_REQ_SIZE 16
230#define DISCOVER_RESP_SIZE 56
231
1acce194
JB		 232static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
233 u8 *disc_resp, int single)
234{
235 int i, res;
236
237 disc_req[9] = single;
238 for (i = 1 ; i < 3; i++) {
239 struct discover_resp *dr;
240
241 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
242 disc_resp, DISCOVER_RESP_SIZE);
243 if (res)
244 return res;
25985edc 245 /* This is detecting a failure to transmit initial
1acce194
JB		 246 * dev to host FIS as described in section G.5 of
247 * sas-2 r 04b */
248 dr = &((struct smp_resp *)disc_resp)->disc;
183ce896 249 if (memcmp(dev->sas_addr, dr->attached_sas_addr,
250 SAS_ADDR_SIZE) == 0) {
251 sas_printk("Found loopback topology, just ignore it!\n");
252 return 0;
253 }
1acce194
JB		 254 if (!(dr->attached_dev_type == 0 &&
255 dr->attached_sata_dev))
256 break;
257 /* In order to generate the dev to host FIS, we
258 * send a link reset to the expander port */
38e2f035 259 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
1acce194
JB		 260 /* Wait for the reset to trigger the negotiation */
261 msleep(500);
262 }
263 sas_set_ex_phy(dev, single, disc_resp);
264 return 0;
265}
266
2908d778
JB		 267static int sas_ex_phy_discover(struct domain_device *dev, int single)
268{
269 struct expander_device *ex = &dev->ex_dev;
270 int res = 0;
271 u8 *disc_req;
272 u8 *disc_resp;
273
274 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
275 if (!disc_req)
276 return -ENOMEM;
277
278 disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
279 if (!disc_resp) {
280 kfree(disc_req);
281 return -ENOMEM;
282 }
283
284 disc_req[1] = SMP_DISCOVER;
285
286 if (0 <= single && single < ex->num_phys) {
1acce194 287 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
2908d778
JB		 288 } else {
289 int i;
290
291 for (i = 0; i < ex->num_phys; i++) {
1acce194
JB		 292 res = sas_ex_phy_discover_helper(dev, disc_req,
293 disc_resp, i);
2908d778
JB		 294 if (res)
295 goto out_err;
2908d778
JB		 296 }
297 }
298out_err:
299 kfree(disc_resp);
300 kfree(disc_req);
301 return res;
302}
303
304static int sas_expander_discover(struct domain_device *dev)
305{
306 struct expander_device *ex = &dev->ex_dev;
307 int res = -ENOMEM;
308
309 ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
310 if (!ex->ex_phy)
311 return -ENOMEM;
312
313 res = sas_ex_phy_discover(dev, -1);
314 if (res)
315 goto out_err;
316
317 return 0;
318 out_err:
319 kfree(ex->ex_phy);
320 ex->ex_phy = NULL;
321 return res;
322}
323
324#define MAX_EXPANDER_PHYS 128
325
326static void ex_assign_report_general(struct domain_device *dev,
327 struct smp_resp *resp)
328{
329 struct report_general_resp *rg = &resp->rg;
330
331 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
332 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
333 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
ffaac8f4 334 dev->ex_dev.t2t_supp = rg->t2t_supp;
2908d778
JB		 335 dev->ex_dev.conf_route_table = rg->conf_route_table;
336 dev->ex_dev.configuring = rg->configuring;
337 memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
338}
339
340#define RG_REQ_SIZE 8
341#define RG_RESP_SIZE 32
342
343static int sas_ex_general(struct domain_device *dev)
344{
345 u8 *rg_req;
346 struct smp_resp *rg_resp;
347 int res;
348 int i;
349
350 rg_req = alloc_smp_req(RG_REQ_SIZE);
351 if (!rg_req)
352 return -ENOMEM;
353
354 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
355 if (!rg_resp) {
356 kfree(rg_req);
357 return -ENOMEM;
358 }
359
360 rg_req[1] = SMP_REPORT_GENERAL;
361
362 for (i = 0; i < 5; i++) {
363 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
364 RG_RESP_SIZE);
365
366 if (res) {
367 SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
368 SAS_ADDR(dev->sas_addr), res);
369 goto out;
370 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
371 SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
372 SAS_ADDR(dev->sas_addr), rg_resp->result);
373 res = rg_resp->result;
374 goto out;
375 }
376
377 ex_assign_report_general(dev, rg_resp);
378
379 if (dev->ex_dev.configuring) {
380 SAS_DPRINTK("RG: ex %llx self-configuring...\n",
381 SAS_ADDR(dev->sas_addr));
382 schedule_timeout_interruptible(5*HZ);
383 } else
384 break;
385 }
386out:
387 kfree(rg_req);
388 kfree(rg_resp);
389 return res;
390}
391
392static void ex_assign_manuf_info(struct domain_device *dev, void
393 *_mi_resp)
394{
395 u8 *mi_resp = _mi_resp;
396 struct sas_rphy *rphy = dev->rphy;
397 struct sas_expander_device *edev = rphy_to_expander_device(rphy);
398
399 memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
400 memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
401 memcpy(edev->product_rev, mi_resp + 36,
402 SAS_EXPANDER_PRODUCT_REV_LEN);
403
404 if (mi_resp[8] & 1) {
405 memcpy(edev->component_vendor_id, mi_resp + 40,
406 SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
407 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
408 edev->component_revision_id = mi_resp[50];
409 }
410}
411
412#define MI_REQ_SIZE 8
413#define MI_RESP_SIZE 64
414
415static int sas_ex_manuf_info(struct domain_device *dev)
416{
417 u8 *mi_req;
418 u8 *mi_resp;
419 int res;
420
421 mi_req = alloc_smp_req(MI_REQ_SIZE);
422 if (!mi_req)
423 return -ENOMEM;
424
425 mi_resp = alloc_smp_resp(MI_RESP_SIZE);
426 if (!mi_resp) {
427 kfree(mi_req);
428 return -ENOMEM;
429 }
430
431 mi_req[1] = SMP_REPORT_MANUF_INFO;
432
433 res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
434 if (res) {
435 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
436 SAS_ADDR(dev->sas_addr), res);
437 goto out;
438 } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
439 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
440 SAS_ADDR(dev->sas_addr), mi_resp[2]);
441 goto out;
442 }
443
444 ex_assign_manuf_info(dev, mi_resp);
445out:
446 kfree(mi_req);
447 kfree(mi_resp);
448 return res;
449}
450
451#define PC_REQ_SIZE 44
452#define PC_RESP_SIZE 8
453
454int sas_smp_phy_control(struct domain_device *dev, int phy_id,
a01e70e5
JB		 455 enum phy_func phy_func,
456 struct sas_phy_linkrates *rates)
2908d778
JB		 457{
458 u8 *pc_req;
459 u8 *pc_resp;
460 int res;
461
462 pc_req = alloc_smp_req(PC_REQ_SIZE);
463 if (!pc_req)
464 return -ENOMEM;
465
466 pc_resp = alloc_smp_resp(PC_RESP_SIZE);
467 if (!pc_resp) {
468 kfree(pc_req);
469 return -ENOMEM;
470 }
471
472 pc_req[1] = SMP_PHY_CONTROL;
473 pc_req[9] = phy_id;
474 pc_req[10]= phy_func;
a01e70e5
JB		 475 if (rates) {
476 pc_req[32] = rates->minimum_linkrate << 4;
477 pc_req[33] = rates->maximum_linkrate << 4;
478 }
2908d778
JB		 479
480 res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
481
482 kfree(pc_resp);
483 kfree(pc_req);
484 return res;
485}
486
487static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
488{
489 struct expander_device *ex = &dev->ex_dev;
490 struct ex_phy *phy = &ex->ex_phy[phy_id];
491
a01e70e5 492 sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
88edf746 493 phy->linkrate = SAS_PHY_DISABLED;
2908d778
JB		 494}
495
496static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
497{
498 struct expander_device *ex = &dev->ex_dev;
499 int i;
500
501 for (i = 0; i < ex->num_phys; i++) {
502 struct ex_phy *phy = &ex->ex_phy[i];
503
504 if (phy->phy_state == PHY_VACANT ||
505 phy->phy_state == PHY_NOT_PRESENT)
506 continue;
507
508 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
509 sas_ex_disable_phy(dev, i);
510 }
511}
512
513static int sas_dev_present_in_domain(struct asd_sas_port *port,
514 u8 *sas_addr)
515{
516 struct domain_device *dev;
517
518 if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
519 return 1;
520 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
521 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
522 return 1;
523 }
524 return 0;
525}
526
527#define RPEL_REQ_SIZE 16
528#define RPEL_RESP_SIZE 32
529int sas_smp_get_phy_events(struct sas_phy *phy)
530{
531 int res;
92631fa4
JJ		 532 u8 *req;
533 u8 *resp;
2908d778
JB		 534 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
535 struct domain_device *dev = sas_find_dev_by_rphy(rphy);
2908d778 536
92631fa4
JJ		 537 req = alloc_smp_req(RPEL_REQ_SIZE);
538 if (!req)
2908d778
JB		 539 return -ENOMEM;
540
92631fa4
JJ		 541 resp = alloc_smp_resp(RPEL_RESP_SIZE);
542 if (!resp) {
543 kfree(req);
544 return -ENOMEM;
545 }
546
2908d778
JB		 547 req[1] = SMP_REPORT_PHY_ERR_LOG;
548 req[9] = phy->number;
549
550 res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
551 resp, RPEL_RESP_SIZE);
552
553 if (!res)
554 goto out;
555
556 phy->invalid_dword_count = scsi_to_u32(&resp[12]);
557 phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
558 phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
559 phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
560
561 out:
562 kfree(resp);
563 return res;
564
565}
566
b9142174
JB		 567#ifdef CONFIG_SCSI_SAS_ATA
568
2908d778
JB		 569#define RPS_REQ_SIZE 16
570#define RPS_RESP_SIZE 60
571
572static int sas_get_report_phy_sata(struct domain_device *dev,
573 int phy_id,
574 struct smp_resp *rps_resp)
575{
576 int res;
577 u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
1acce194 578 u8 *resp = (u8 *)rps_resp;
2908d778
JB		 579
580 if (!rps_req)
581 return -ENOMEM;
582
583 rps_req[1] = SMP_REPORT_PHY_SATA;
584 rps_req[9] = phy_id;
585
586 res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
587 rps_resp, RPS_RESP_SIZE);
588
1acce194
JB		 589 /* 0x34 is the FIS type for the D2H fis. There's a potential
590 * standards cockup here. sas-2 explicitly specifies the FIS
591 * should be encoded so that FIS type is in resp[24].
592 * However, some expanders endian reverse this. Undo the
593 * reversal here */
594 if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
595 int i;
596
597 for (i = 0; i < 5; i++) {
598 int j = 24 + (i*4);
599 u8 a, b;
600 a = resp[j + 0];
601 b = resp[j + 1];
602 resp[j + 0] = resp[j + 3];
603 resp[j + 1] = resp[j + 2];
604 resp[j + 2] = b;
605 resp[j + 3] = a;
606 }
607 }
608
2908d778 609 kfree(rps_req);
1acce194 610 return res;
2908d778 611}
b9142174 612#endif
2908d778
JB		 613
614static void sas_ex_get_linkrate(struct domain_device *parent,
615 struct domain_device *child,
616 struct ex_phy *parent_phy)
617{
618 struct expander_device *parent_ex = &parent->ex_dev;
619 struct sas_port *port;
620 int i;
621
622 child->pathways = 0;
623
624 port = parent_phy->port;
625
626 for (i = 0; i < parent_ex->num_phys; i++) {
627 struct ex_phy *phy = &parent_ex->ex_phy[i];
628
629 if (phy->phy_state == PHY_VACANT ||
630 phy->phy_state == PHY_NOT_PRESENT)
631 continue;
632
633 if (SAS_ADDR(phy->attached_sas_addr) ==
634 SAS_ADDR(child->sas_addr)) {
635
636 child->min_linkrate = min(parent->min_linkrate,
637 phy->linkrate);
638 child->max_linkrate = max(parent->max_linkrate,
639 phy->linkrate);
640 child->pathways++;
641 sas_port_add_phy(port, phy->phy);
642 }
643 }
644 child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
645 child->pathways = min(child->pathways, parent->pathways);
646}
647
648static struct domain_device *sas_ex_discover_end_dev(
649 struct domain_device *parent, int phy_id)
650{
651 struct expander_device *parent_ex = &parent->ex_dev;
652 struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
653 struct domain_device *child = NULL;
654 struct sas_rphy *rphy;
655 int res;
656
657 if (phy->attached_sata_host || phy->attached_sata_ps)
658 return NULL;
659
735f7d2f 660 child = sas_alloc_device();
2908d778
JB		 661 if (!child)
662 return NULL;
663
735f7d2f 664 kref_get(&parent->kref);
2908d778
JB		 665 child->parent = parent;
666 child->port = parent->port;
667 child->iproto = phy->attached_iproto;
668 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
669 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
024879ea
JB		 670 if (!phy->port) {
671 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
672 if (unlikely(!phy->port))
673 goto out_err;
674 if (unlikely(sas_port_add(phy->port) != 0)) {
675 sas_port_free(phy->port);
676 goto out_err;
677 }
678 }
2908d778
JB		 679 sas_ex_get_linkrate(parent, child, phy);
680
b9142174 681#ifdef CONFIG_SCSI_SAS_ATA
5929faf3 682 if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
2908d778 683 child->dev_type = SATA_DEV;
5929faf3 684 if (phy->attached_tproto & SAS_PROTOCOL_STP)
2908d778
JB		 685 child->tproto = phy->attached_tproto;
686 if (phy->attached_sata_dev)
687 child->tproto |= SATA_DEV;
688 res = sas_get_report_phy_sata(parent, phy_id,
689 &child->sata_dev.rps_resp);
690 if (res) {
691 SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
692 "0x%x\n", SAS_ADDR(parent->sas_addr),
693 phy_id, res);
024879ea 694 goto out_free;
2908d778
JB		 695 }
696 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
697 sizeof(struct dev_to_host_fis));
1acce194
JB		 698
699 rphy = sas_end_device_alloc(phy->port);
528fd552
JB		 700 if (unlikely(!rphy))
701 goto out_free;
1acce194 702
2908d778 703 sas_init_dev(child);
1acce194
JB		 704
705 child->rphy = rphy;
706
9d720d82 707 spin_lock_irq(&parent->port->dev_list_lock);
1acce194 708 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 709 spin_unlock_irq(&parent->port->dev_list_lock);
1acce194 710
2908d778
JB		 711 res = sas_discover_sata(child);
712 if (res) {
713 SAS_DPRINTK("sas_discover_sata() for device %16llx at "
714 "%016llx:0x%x returned 0x%x\n",
715 SAS_ADDR(child->sas_addr),
716 SAS_ADDR(parent->sas_addr), phy_id, res);
1acce194 717 goto out_list_del;
2908d778 718 }
b9142174
JB		 719 } else
720#endif
5929faf3 721 if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
2908d778
JB		 722 child->dev_type = SAS_END_DEV;
723 rphy = sas_end_device_alloc(phy->port);
724 /* FIXME: error handling */
024879ea
JB		 725 if (unlikely(!rphy))
726 goto out_free;
2908d778
JB		 727 child->tproto = phy->attached_tproto;
728 sas_init_dev(child);
729
730 child->rphy = rphy;
731 sas_fill_in_rphy(child, rphy);
732
9d720d82 733 spin_lock_irq(&parent->port->dev_list_lock);
2908d778 734 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 735 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 736
737 res = sas_discover_end_dev(child);
738 if (res) {
739 SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
740 "at %016llx:0x%x returned 0x%x\n",
741 SAS_ADDR(child->sas_addr),
742 SAS_ADDR(parent->sas_addr), phy_id, res);
024879ea 743 goto out_list_del;
2908d778
JB		 744 }
745 } else {
746 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
747 phy->attached_tproto, SAS_ADDR(parent->sas_addr),
748 phy_id);
b9142174 749 goto out_free;
2908d778
JB		 750 }
751
752 list_add_tail(&child->siblings, &parent_ex->children);
753 return child;
024879ea
JB		 754
755 out_list_del:
6f63caae
DW		 756 sas_rphy_free(child->rphy);
757 child->rphy = NULL;
1a34c064
DW		 758
759 spin_lock_irq(&parent->port->dev_list_lock);
024879ea 760 list_del(&child->dev_list_node);
1a34c064 761 spin_unlock_irq(&parent->port->dev_list_lock);
024879ea
JB		 762 out_free:
763 sas_port_delete(phy->port);
764 out_err:
765 phy->port = NULL;
735f7d2f 766 sas_put_device(child);
024879ea 767 return NULL;
2908d778
JB		 768}
769
423f7cf4
DW		 770/* See if this phy is part of a wide port */
771static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
772{
773 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
774 int i;
775
776 for (i = 0; i < parent->ex_dev.num_phys; i++) {
777 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
778
779 if (ephy == phy)
780 continue;
781
782 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
783 SAS_ADDR_SIZE) && ephy->port) {
784 sas_port_add_phy(ephy->port, phy->phy);
19252de6 785 phy->port = ephy->port;
423f7cf4
DW		 786 phy->phy_state = PHY_DEVICE_DISCOVERED;
787 return 0;
788 }
789 }
790
791 return -ENODEV;
792}
793
2908d778
JB		 794static struct domain_device *sas_ex_discover_expander(
795 struct domain_device *parent, int phy_id)
796{
797 struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
798 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
799 struct domain_device *child = NULL;
800 struct sas_rphy *rphy;
801 struct sas_expander_device *edev;
802 struct asd_sas_port *port;
803 int res;
804
805 if (phy->routing_attr == DIRECT_ROUTING) {
806 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
807 "allowed\n",
808 SAS_ADDR(parent->sas_addr), phy_id,
809 SAS_ADDR(phy->attached_sas_addr),
810 phy->attached_phy_id);
811 return NULL;
812 }
735f7d2f 813 child = sas_alloc_device();
2908d778
JB		 814 if (!child)
815 return NULL;
816
817 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
818 /* FIXME: better error handling */
819 BUG_ON(sas_port_add(phy->port) != 0);
820
821
822 switch (phy->attached_dev_type) {
823 case EDGE_DEV:
824 rphy = sas_expander_alloc(phy->port,
825 SAS_EDGE_EXPANDER_DEVICE);
826 break;
827 case FANOUT_DEV:
828 rphy = sas_expander_alloc(phy->port,
829 SAS_FANOUT_EXPANDER_DEVICE);
830 break;
831 default:
832 rphy = NULL; /* shut gcc up */
833 BUG();
834 }
835 port = parent->port;
836 child->rphy = rphy;
837 edev = rphy_to_expander_device(rphy);
838 child->dev_type = phy->attached_dev_type;
735f7d2f 839 kref_get(&parent->kref);
2908d778
JB		 840 child->parent = parent;
841 child->port = port;
842 child->iproto = phy->attached_iproto;
843 child->tproto = phy->attached_tproto;
844 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
845 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
846 sas_ex_get_linkrate(parent, child, phy);
847 edev->level = parent_ex->level + 1;
848 parent->port->disc.max_level = max(parent->port->disc.max_level,
849 edev->level);
850 sas_init_dev(child);
851 sas_fill_in_rphy(child, rphy);
852 sas_rphy_add(rphy);
853
9d720d82 854 spin_lock_irq(&parent->port->dev_list_lock);
2908d778 855 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 856 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 857
858 res = sas_discover_expander(child);
859 if (res) {
5911e963
LT		 860 spin_lock_irq(&parent->port->dev_list_lock);
861 list_del(&child->dev_list_node);
862 spin_unlock_irq(&parent->port->dev_list_lock);
735f7d2f 863 sas_put_device(child);
2908d778
JB		 864 return NULL;
865 }
866 list_add_tail(&child->siblings, &parent->ex_dev.children);
867 return child;
868}
869
870static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
871{
872 struct expander_device *ex = &dev->ex_dev;
873 struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
874 struct domain_device *child = NULL;
875 int res = 0;
876
877 /* Phy state */
88edf746 878 if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
a01e70e5 879 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
2908d778
JB		 880 res = sas_ex_phy_discover(dev, phy_id);
881 if (res)
882 return res;
883 }
884
885 /* Parent and domain coherency */
886 if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
887 SAS_ADDR(dev->port->sas_addr))) {
888 sas_add_parent_port(dev, phy_id);
889 return 0;
890 }
891 if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
892 SAS_ADDR(dev->parent->sas_addr))) {
893 sas_add_parent_port(dev, phy_id);
894 if (ex_phy->routing_attr == TABLE_ROUTING)
895 sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
896 return 0;
897 }
898
899 if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
900 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
901
902 if (ex_phy->attached_dev_type == NO_DEVICE) {
903 if (ex_phy->routing_attr == DIRECT_ROUTING) {
904 memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
905 sas_configure_routing(dev, ex_phy->attached_sas_addr);
906 }
907 return 0;
88edf746 908 } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
2908d778
JB		 909 return 0;
910
911 if (ex_phy->attached_dev_type != SAS_END_DEV &&
912 ex_phy->attached_dev_type != FANOUT_DEV &&
913 ex_phy->attached_dev_type != EDGE_DEV) {
914 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
915 "phy 0x%x\n", ex_phy->attached_dev_type,
916 SAS_ADDR(dev->sas_addr),
917 phy_id);
918 return 0;
919 }
920
921 res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
922 if (res) {
923 SAS_DPRINTK("configure routing for dev %016llx "
924 "reported 0x%x. Forgotten\n",
925 SAS_ADDR(ex_phy->attached_sas_addr), res);
926 sas_disable_routing(dev, ex_phy->attached_sas_addr);
927 return res;
928 }
929
423f7cf4
DW		 930 res = sas_ex_join_wide_port(dev, phy_id);
931 if (!res) {
932 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
933 phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
934 return res;
935 }
936
2908d778
JB		 937 switch (ex_phy->attached_dev_type) {
938 case SAS_END_DEV:
939 child = sas_ex_discover_end_dev(dev, phy_id);
940 break;
941 case FANOUT_DEV:
942 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
943 SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
944 "attached to ex %016llx phy 0x%x\n",
945 SAS_ADDR(ex_phy->attached_sas_addr),
946 ex_phy->attached_phy_id,
947 SAS_ADDR(dev->sas_addr),
948 phy_id);
949 sas_ex_disable_phy(dev, phy_id);
950 break;
951 } else
952 memcpy(dev->port->disc.fanout_sas_addr,
953 ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
954 /* fallthrough */
955 case EDGE_DEV:
956 child = sas_ex_discover_expander(dev, phy_id);
957 break;
958 default:
959 break;
960 }
961
962 if (child) {
963 int i;
964
965 for (i = 0; i < ex->num_phys; i++) {
966 if (ex->ex_phy[i].phy_state == PHY_VACANT ||
967 ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
968 continue;
19252de6
TP		 969 /*
970 * Due to races, the phy might not get added to the
971 * wide port, so we add the phy to the wide port here.
972 */
2908d778 973 if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
19252de6 974 SAS_ADDR(child->sas_addr)) {
2908d778 975 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
19252de6
TP		 976 res = sas_ex_join_wide_port(dev, i);
977 if (!res)
978 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
979 i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
980
981 }
2908d778
JB		 982 }
983 }
984
985 return res;
986}
987
988static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
989{
990 struct expander_device *ex = &dev->ex_dev;
991 int i;
992
993 for (i = 0; i < ex->num_phys; i++) {
994 struct ex_phy *phy = &ex->ex_phy[i];
995
996 if (phy->phy_state == PHY_VACANT ||
997 phy->phy_state == PHY_NOT_PRESENT)
998 continue;
999
1000 if ((phy->attached_dev_type == EDGE_DEV ||
1001 phy->attached_dev_type == FANOUT_DEV) &&
1002 phy->routing_attr == SUBTRACTIVE_ROUTING) {
1003
1004 memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1005
1006 return 1;
1007 }
1008 }
1009 return 0;
1010}
1011
1012static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1013{
1014 struct expander_device *ex = &dev->ex_dev;
1015 struct domain_device *child;
1016 u8 sub_addr[8] = {0, };
1017
1018 list_for_each_entry(child, &ex->children, siblings) {
1019 if (child->dev_type != EDGE_DEV &&
1020 child->dev_type != FANOUT_DEV)
1021 continue;
1022 if (sub_addr[0] == 0) {
1023 sas_find_sub_addr(child, sub_addr);
1024 continue;
1025 } else {
1026 u8 s2[8];
1027
1028 if (sas_find_sub_addr(child, s2) &&
1029 (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1030
1031 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1032 "diverges from subtractive "
1033 "boundary %016llx\n",
1034 SAS_ADDR(dev->sas_addr),
1035 SAS_ADDR(child->sas_addr),
1036 SAS_ADDR(s2),
1037 SAS_ADDR(sub_addr));
1038
1039 sas_ex_disable_port(child, s2);
1040 }
1041 }
1042 }
1043 return 0;
1044}
1045/**
1046 * sas_ex_discover_devices -- discover devices attached to this expander
1047 * dev: pointer to the expander domain device
1048 * single: if you want to do a single phy, else set to -1;
1049 *
1050 * Configure this expander for use with its devices and register the
1051 * devices of this expander.
1052 */
1053static int sas_ex_discover_devices(struct domain_device *dev, int single)
1054{
1055 struct expander_device *ex = &dev->ex_dev;
1056 int i = 0, end = ex->num_phys;
1057 int res = 0;
1058
1059 if (0 <= single && single < end) {
1060 i = single;
1061 end = i+1;
1062 }
1063
1064 for ( ; i < end; i++) {
1065 struct ex_phy *ex_phy = &ex->ex_phy[i];
1066
1067 if (ex_phy->phy_state == PHY_VACANT ||
1068 ex_phy->phy_state == PHY_NOT_PRESENT ||
1069 ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1070 continue;
1071
1072 switch (ex_phy->linkrate) {
88edf746
JB		 1073 case SAS_PHY_DISABLED:
1074 case SAS_PHY_RESET_PROBLEM:
1075 case SAS_SATA_PORT_SELECTOR:
2908d778
JB		 1076 continue;
1077 default:
1078 res = sas_ex_discover_dev(dev, i);
1079 if (res)
1080 break;
1081 continue;
1082 }
1083 }
1084
1085 if (!res)
1086 sas_check_level_subtractive_boundary(dev);
1087
1088 return res;
1089}
1090
1091static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1092{
1093 struct expander_device *ex = &dev->ex_dev;
1094 int i;
1095 u8 *sub_sas_addr = NULL;
1096
1097 if (dev->dev_type != EDGE_DEV)
1098 return 0;
1099
1100 for (i = 0; i < ex->num_phys; i++) {
1101 struct ex_phy *phy = &ex->ex_phy[i];
1102
1103 if (phy->phy_state == PHY_VACANT ||
1104 phy->phy_state == PHY_NOT_PRESENT)
1105 continue;
1106
1107 if ((phy->attached_dev_type == FANOUT_DEV ||
1108 phy->attached_dev_type == EDGE_DEV) &&
1109 phy->routing_attr == SUBTRACTIVE_ROUTING) {
1110
1111 if (!sub_sas_addr)
1112 sub_sas_addr = &phy->attached_sas_addr[0];
1113 else if (SAS_ADDR(sub_sas_addr) !=
1114 SAS_ADDR(phy->attached_sas_addr)) {
1115
1116 SAS_DPRINTK("ex %016llx phy 0x%x "
1117 "diverges(%016llx) on subtractive "
1118 "boundary(%016llx). Disabled\n",
1119 SAS_ADDR(dev->sas_addr), i,
1120 SAS_ADDR(phy->attached_sas_addr),
1121 SAS_ADDR(sub_sas_addr));
1122 sas_ex_disable_phy(dev, i);
1123 }
1124 }
1125 }
1126 return 0;
1127}
1128
1129static void sas_print_parent_topology_bug(struct domain_device *child,
1130 struct ex_phy *parent_phy,
1131 struct ex_phy *child_phy)
1132{
1133 static const char ra_char[] = {
1134 [DIRECT_ROUTING] = 'D',
1135 [SUBTRACTIVE_ROUTING] = 'S',
1136 [TABLE_ROUTING] = 'T',
1137 };
1138 static const char *ex_type[] = {
1139 [EDGE_DEV] = "edge",
1140 [FANOUT_DEV] = "fanout",
1141 };
1142 struct domain_device *parent = child->parent;
1143
ffaac8f4
LT		 1144 sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
1145 "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
2908d778
JB		 1146
1147 ex_type[parent->dev_type],
1148 SAS_ADDR(parent->sas_addr),
ffaac8f4 1149 parent->ex_dev.t2t_supp,
2908d778
JB		 1150 parent_phy->phy_id,
1151
1152 ex_type[child->dev_type],
1153 SAS_ADDR(child->sas_addr),
ffaac8f4 1154 child->ex_dev.t2t_supp,
2908d778
JB		 1155 child_phy->phy_id,
1156
1157 ra_char[parent_phy->routing_attr],
1158 ra_char[child_phy->routing_attr]);
1159}
1160
1161static int sas_check_eeds(struct domain_device *child,
1162 struct ex_phy *parent_phy,
1163 struct ex_phy *child_phy)
1164{
1165 int res = 0;
1166 struct domain_device *parent = child->parent;
1167
1168 if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1169 res = -ENODEV;
1170 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1171 "phy S:0x%x, while there is a fanout ex %016llx\n",
1172 SAS_ADDR(parent->sas_addr),
1173 parent_phy->phy_id,
1174 SAS_ADDR(child->sas_addr),
1175 child_phy->phy_id,
1176 SAS_ADDR(parent->port->disc.fanout_sas_addr));
1177 } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1178 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1179 SAS_ADDR_SIZE);
1180 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1181 SAS_ADDR_SIZE);
1182 } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1183 SAS_ADDR(parent->sas_addr)) ||
1184 (SAS_ADDR(parent->port->disc.eeds_a) ==
1185 SAS_ADDR(child->sas_addr)))
1186 &&
1187 ((SAS_ADDR(parent->port->disc.eeds_b) ==
1188 SAS_ADDR(parent->sas_addr)) ||
1189 (SAS_ADDR(parent->port->disc.eeds_b) ==
1190 SAS_ADDR(child->sas_addr))))
1191 ;
1192 else {
1193 res = -ENODEV;
1194 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1195 "phy 0x%x link forms a third EEDS!\n",
1196 SAS_ADDR(parent->sas_addr),
1197 parent_phy->phy_id,
1198 SAS_ADDR(child->sas_addr),
1199 child_phy->phy_id);
1200 }
1201
1202 return res;
1203}
1204
1205/* Here we spill over 80 columns. It is intentional.
1206 */
1207static int sas_check_parent_topology(struct domain_device *child)
1208{
1209 struct expander_device *child_ex = &child->ex_dev;
1210 struct expander_device *parent_ex;
1211 int i;
1212 int res = 0;
1213
1214 if (!child->parent)
1215 return 0;
1216
1217 if (child->parent->dev_type != EDGE_DEV &&
1218 child->parent->dev_type != FANOUT_DEV)
1219 return 0;
1220
1221 parent_ex = &child->parent->ex_dev;
1222
1223 for (i = 0; i < parent_ex->num_phys; i++) {
1224 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1225 struct ex_phy *child_phy;
1226
1227 if (parent_phy->phy_state == PHY_VACANT ||
1228 parent_phy->phy_state == PHY_NOT_PRESENT)
1229 continue;
1230
1231 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1232 continue;
1233
1234 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1235
1236 switch (child->parent->dev_type) {
1237 case EDGE_DEV:
1238 if (child->dev_type == FANOUT_DEV) {
1239 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1240 child_phy->routing_attr != TABLE_ROUTING) {
1241 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1242 res = -ENODEV;
1243 }
1244 } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1245 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1246 res = sas_check_eeds(child, parent_phy, child_phy);
1247 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1248 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1249 res = -ENODEV;
1250 }
ffaac8f4
LT		 1251 } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1252 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1253 (child_phy->routing_attr == TABLE_ROUTING &&
1254 child_ex->t2t_supp && parent_ex->t2t_supp)) {
1255 /* All good */;
1256 } else {
1257 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1258 res = -ENODEV;
1259 }
2908d778
JB		 1260 }
1261 break;
1262 case FANOUT_DEV:
1263 if (parent_phy->routing_attr != TABLE_ROUTING ||
1264 child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1265 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1266 res = -ENODEV;
1267 }
1268 break;
1269 default:
1270 break;
1271 }
1272 }
1273
1274 return res;
1275}
1276
1277#define RRI_REQ_SIZE 16
1278#define RRI_RESP_SIZE 44
1279
1280static int sas_configure_present(struct domain_device *dev, int phy_id,
1281 u8 *sas_addr, int *index, int *present)
1282{
1283 int i, res = 0;
1284 struct expander_device *ex = &dev->ex_dev;
1285 struct ex_phy *phy = &ex->ex_phy[phy_id];
1286 u8 *rri_req;
1287 u8 *rri_resp;
1288
1289 *present = 0;
1290 *index = 0;
1291
1292 rri_req = alloc_smp_req(RRI_REQ_SIZE);
1293 if (!rri_req)
1294 return -ENOMEM;
1295
1296 rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1297 if (!rri_resp) {
1298 kfree(rri_req);
1299 return -ENOMEM;
1300 }
1301
1302 rri_req[1] = SMP_REPORT_ROUTE_INFO;
1303 rri_req[9] = phy_id;
1304
1305 for (i = 0; i < ex->max_route_indexes ; i++) {
1306 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1307 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1308 RRI_RESP_SIZE);
1309 if (res)
1310 goto out;
1311 res = rri_resp[2];
1312 if (res == SMP_RESP_NO_INDEX) {
1313 SAS_DPRINTK("overflow of indexes: dev %016llx "
1314 "phy 0x%x index 0x%x\n",
1315 SAS_ADDR(dev->sas_addr), phy_id, i);
1316 goto out;
1317 } else if (res != SMP_RESP_FUNC_ACC) {
1318 SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
cadbd4a5 1319 "result 0x%x\n", __func__,
2908d778
JB		 1320 SAS_ADDR(dev->sas_addr), phy_id, i, res);
1321 goto out;
1322 }
1323 if (SAS_ADDR(sas_addr) != 0) {
1324 if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1325 *index = i;
1326 if ((rri_resp[12] & 0x80) == 0x80)
1327 *present = 0;
1328 else
1329 *present = 1;
1330 goto out;
1331 } else if (SAS_ADDR(rri_resp+16) == 0) {
1332 *index = i;
1333 *present = 0;
1334 goto out;
1335 }
1336 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1337 phy->last_da_index < i) {
1338 phy->last_da_index = i;
1339 *index = i;
1340 *present = 0;
1341 goto out;
1342 }
1343 }
1344 res = -1;
1345out:
1346 kfree(rri_req);
1347 kfree(rri_resp);
1348 return res;
1349}
1350
1351#define CRI_REQ_SIZE 44
1352#define CRI_RESP_SIZE 8
1353
1354static int sas_configure_set(struct domain_device *dev, int phy_id,
1355 u8 *sas_addr, int index, int include)
1356{
1357 int res;
1358 u8 *cri_req;
1359 u8 *cri_resp;
1360
1361 cri_req = alloc_smp_req(CRI_REQ_SIZE);
1362 if (!cri_req)
1363 return -ENOMEM;
1364
1365 cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1366 if (!cri_resp) {
1367 kfree(cri_req);
1368 return -ENOMEM;
1369 }
1370
1371 cri_req[1] = SMP_CONF_ROUTE_INFO;
1372 *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1373 cri_req[9] = phy_id;
1374 if (SAS_ADDR(sas_addr) == 0 || !include)
1375 cri_req[12] |= 0x80;
1376 memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1377
1378 res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1379 CRI_RESP_SIZE);
1380 if (res)
1381 goto out;
1382 res = cri_resp[2];
1383 if (res == SMP_RESP_NO_INDEX) {
1384 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1385 "index 0x%x\n",
1386 SAS_ADDR(dev->sas_addr), phy_id, index);
1387 }
1388out:
1389 kfree(cri_req);
1390 kfree(cri_resp);
1391 return res;
1392}
1393
1394static int sas_configure_phy(struct domain_device *dev, int phy_id,
1395 u8 *sas_addr, int include)
1396{
1397 int index;
1398 int present;
1399 int res;
1400
1401 res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1402 if (res)
1403 return res;
1404 if (include ^ present)
1405 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1406
1407 return res;
1408}
1409
1410/**
1411 * sas_configure_parent -- configure routing table of parent
1412 * parent: parent expander
1413 * child: child expander
1414 * sas_addr: SAS port identifier of device directly attached to child
1415 */
1416static int sas_configure_parent(struct domain_device *parent,
1417 struct domain_device *child,
1418 u8 *sas_addr, int include)
1419{
1420 struct expander_device *ex_parent = &parent->ex_dev;
1421 int res = 0;
1422 int i;
1423
1424 if (parent->parent) {
1425 res = sas_configure_parent(parent->parent, parent, sas_addr,
1426 include);
1427 if (res)
1428 return res;
1429 }
1430
1431 if (ex_parent->conf_route_table == 0) {
1432 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1433 SAS_ADDR(parent->sas_addr));
1434 return 0;
1435 }
1436
1437 for (i = 0; i < ex_parent->num_phys; i++) {
1438 struct ex_phy *phy = &ex_parent->ex_phy[i];
1439
1440 if ((phy->routing_attr == TABLE_ROUTING) &&
1441 (SAS_ADDR(phy->attached_sas_addr) ==
1442 SAS_ADDR(child->sas_addr))) {
1443 res = sas_configure_phy(parent, i, sas_addr, include);
1444 if (res)
1445 return res;
1446 }
1447 }
1448
1449 return res;
1450}
1451
1452/**
1453 * sas_configure_routing -- configure routing
1454 * dev: expander device
1455 * sas_addr: port identifier of device directly attached to the expander device
1456 */
1457static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1458{
1459 if (dev->parent)
1460 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1461 return 0;
1462}
1463
1464static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr)
1465{
1466 if (dev->parent)
1467 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1468 return 0;
1469}
1470
2908d778
JB		 1471/**
1472 * sas_discover_expander -- expander discovery
1473 * @ex: pointer to expander domain device
1474 *
1475 * See comment in sas_discover_sata().
1476 */
1477static int sas_discover_expander(struct domain_device *dev)
1478{
1479 int res;
1480
1481 res = sas_notify_lldd_dev_found(dev);
1482 if (res)
1483 return res;
1484
1485 res = sas_ex_general(dev);
1486 if (res)
1487 goto out_err;
1488 res = sas_ex_manuf_info(dev);
1489 if (res)
1490 goto out_err;
1491
1492 res = sas_expander_discover(dev);
1493 if (res) {
1494 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1495 SAS_ADDR(dev->sas_addr), res);
1496 goto out_err;
1497 }
1498
1499 sas_check_ex_subtractive_boundary(dev);
1500 res = sas_check_parent_topology(dev);
1501 if (res)
1502 goto out_err;
1503 return 0;
1504out_err:
1505 sas_notify_lldd_dev_gone(dev);
1506 return res;
1507}
1508
1509static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1510{
1511 int res = 0;
1512 struct domain_device *dev;
1513
1514 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1515 if (dev->dev_type == EDGE_DEV ||
1516 dev->dev_type == FANOUT_DEV) {
1517 struct sas_expander_device *ex =
1518 rphy_to_expander_device(dev->rphy);
1519
1520 if (level == ex->level)
1521 res = sas_ex_discover_devices(dev, -1);
1522 else if (level > 0)
1523 res = sas_ex_discover_devices(port->port_dev, -1);
1524
1525 }
1526 }
1527
1528 return res;
1529}
1530
1531static int sas_ex_bfs_disc(struct asd_sas_port *port)
1532{
1533 int res;
1534 int level;
1535
1536 do {
1537 level = port->disc.max_level;
1538 res = sas_ex_level_discovery(port, level);
1539 mb();
1540 } while (level < port->disc.max_level);
1541
1542 return res;
1543}
1544
1545int sas_discover_root_expander(struct domain_device *dev)
1546{
1547 int res;
1548 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1549
bf451207
DW		 1550 res = sas_rphy_add(dev->rphy);
1551 if (res)
1552 goto out_err;
2908d778
JB		 1553
1554 ex->level = dev->port->disc.max_level; /* 0 */
1555 res = sas_discover_expander(dev);
bf451207
DW		 1556 if (res)
1557 goto out_err2;
1558
1559 sas_ex_bfs_disc(dev->port);
2908d778
JB		 1560
1561 return res;
bf451207
DW		 1562
1563out_err2:
6f63caae 1564 sas_rphy_remove(dev->rphy);
bf451207 1565out_err:
bf451207 1566 return res;
2908d778
JB		 1567}
1568
1569/* ---------- Domain revalidation ---------- */
1570
1571static int sas_get_phy_discover(struct domain_device *dev,
1572 int phy_id, struct smp_resp *disc_resp)
1573{
1574 int res;
1575 u8 *disc_req;
1576
1577 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1578 if (!disc_req)
1579 return -ENOMEM;
1580
1581 disc_req[1] = SMP_DISCOVER;
1582 disc_req[9] = phy_id;
1583
1584 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1585 disc_resp, DISCOVER_RESP_SIZE);
1586 if (res)
1587 goto out;
1588 else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1589 res = disc_resp->result;
1590 goto out;
1591 }
1592out:
1593 kfree(disc_req);
1594 return res;
1595}
1596
1597static int sas_get_phy_change_count(struct domain_device *dev,
1598 int phy_id, int *pcc)
1599{
1600 int res;
1601 struct smp_resp *disc_resp;
1602
1603 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1604 if (!disc_resp)
1605 return -ENOMEM;
1606
1607 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1608 if (!res)
1609 *pcc = disc_resp->disc.change_count;
1610
1611 kfree(disc_resp);
1612 return res;
1613}
1614
1615static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1616 int phy_id, u8 *attached_sas_addr)
1617{
1618 int res;
1619 struct smp_resp *disc_resp;
1620 struct discover_resp *dr;
1621
1622 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1623 if (!disc_resp)
1624 return -ENOMEM;
1625 dr = &disc_resp->disc;
1626
1627 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1628 if (!res) {
1629 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1630 if (dr->attached_dev_type == 0)
1631 memset(attached_sas_addr, 0, 8);
1632 }
1633 kfree(disc_resp);
1634 return res;
1635}
1636
1637static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
19252de6 1638 int from_phy, bool update)
2908d778
JB		 1639{
1640 struct expander_device *ex = &dev->ex_dev;
1641 int res = 0;
1642 int i;
1643
1644 for (i = from_phy; i < ex->num_phys; i++) {
1645 int phy_change_count = 0;
1646
1647 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1648 if (res)
1649 goto out;
1650 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
19252de6
TP		 1651 if (update)
1652 ex->ex_phy[i].phy_change_count =
1653 phy_change_count;
2908d778
JB		 1654 *phy_id = i;
1655 return 0;
1656 }
1657 }
1658out:
1659 return res;
1660}
1661
1662static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1663{
1664 int res;
1665 u8 *rg_req;
1666 struct smp_resp *rg_resp;
1667
1668 rg_req = alloc_smp_req(RG_REQ_SIZE);
1669 if (!rg_req)
1670 return -ENOMEM;
1671
1672 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1673 if (!rg_resp) {
1674 kfree(rg_req);
1675 return -ENOMEM;
1676 }
1677
1678 rg_req[1] = SMP_REPORT_GENERAL;
1679
1680 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1681 RG_RESP_SIZE);
1682 if (res)
1683 goto out;
1684 if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1685 res = rg_resp->result;
1686 goto out;
1687 }
1688
1689 *ecc = be16_to_cpu(rg_resp->rg.change_count);
1690out:
1691 kfree(rg_resp);
1692 kfree(rg_req);
1693 return res;
1694}
19252de6
TP		 1695/**
1696 * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE).
1697 * @dev:domain device to be detect.
1698 * @src_dev: the device which originated BROADCAST(CHANGE).
1699 *
1700 * Add self-configuration expander suport. Suppose two expander cascading,
1701 * when the first level expander is self-configuring, hotplug the disks in
1702 * second level expander, BROADCAST(CHANGE) will not only be originated
1703 * in the second level expander, but also be originated in the first level
1704 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1705 * expander changed count in two level expanders will all increment at least
1706 * once, but the phy which chang count has changed is the source device which
1707 * we concerned.
1708 */
2908d778
JB		 1709
1710static int sas_find_bcast_dev(struct domain_device *dev,
1711 struct domain_device **src_dev)
1712{
1713 struct expander_device *ex = &dev->ex_dev;
1714 int ex_change_count = -1;
19252de6 1715 int phy_id = -1;
2908d778 1716 int res;
19252de6 1717 struct domain_device *ch;
2908d778
JB		 1718
1719 res = sas_get_ex_change_count(dev, &ex_change_count);
1720 if (res)
1721 goto out;
19252de6
TP		 1722 if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1723 /* Just detect if this expander phys phy change count changed,
1724 * in order to determine if this expander originate BROADCAST,
1725 * and do not update phy change count field in our structure.
1726 */
1727 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1728 if (phy_id != -1) {
1729 *src_dev = dev;
1730 ex->ex_change_count = ex_change_count;
1731 SAS_DPRINTK("Expander phy change count has changed\n");
1732 return res;
1733 } else
1734 SAS_DPRINTK("Expander phys DID NOT change\n");
1735 }
1736 list_for_each_entry(ch, &ex->children, siblings) {
1737 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1738 res = sas_find_bcast_dev(ch, src_dev);
24926dad 1739 if (*src_dev)
19252de6 1740 return res;
2908d778
JB		 1741 }
1742 }
1743out:
1744 return res;
1745}
1746
1a34c064 1747static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
2908d778
JB		 1748{
1749 struct expander_device *ex = &dev->ex_dev;
1750 struct domain_device *child, *n;
1751
1752 list_for_each_entry_safe(child, n, &ex->children, siblings) {
56dd2c06 1753 child->gone = 1;
2908d778
JB		 1754 if (child->dev_type == EDGE_DEV ||
1755 child->dev_type == FANOUT_DEV)
1a34c064 1756 sas_unregister_ex_tree(port, child);
2908d778 1757 else
1a34c064 1758 sas_unregister_dev(port, child);
2908d778 1759 }
1a34c064 1760 sas_unregister_dev(port, dev);
2908d778
JB		 1761}
1762
1763static void sas_unregister_devs_sas_addr(struct domain_device *parent,
19252de6 1764 int phy_id, bool last)
2908d778
JB		 1765{
1766 struct expander_device *ex_dev = &parent->ex_dev;
1767 struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1768 struct domain_device *child, *n;
19252de6
TP		 1769 if (last) {
1770 list_for_each_entry_safe(child, n,
1771 &ex_dev->children, siblings) {
1772 if (SAS_ADDR(child->sas_addr) ==
1773 SAS_ADDR(phy->attached_sas_addr)) {
56dd2c06 1774 child->gone = 1;
19252de6
TP		 1775 if (child->dev_type == EDGE_DEV ||
1776 child->dev_type == FANOUT_DEV)
1a34c064 1777 sas_unregister_ex_tree(parent->port, child);
19252de6 1778 else
1a34c064 1779 sas_unregister_dev(parent->port, child);
19252de6
TP		 1780 break;
1781 }
2908d778 1782 }
56dd2c06 1783 parent->gone = 1;
19252de6 1784 sas_disable_routing(parent, phy->attached_sas_addr);
2908d778 1785 }
2908d778 1786 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
a73914c3
MS		 1787 if (phy->port) {
1788 sas_port_delete_phy(phy->port, phy->phy);
1789 if (phy->port->num_phys == 0)
1790 sas_port_delete(phy->port);
1791 phy->port = NULL;
1792 }
2908d778
JB		 1793}
1794
1795static int sas_discover_bfs_by_root_level(struct domain_device *root,
1796 const int level)
1797{
1798 struct expander_device *ex_root = &root->ex_dev;
1799 struct domain_device *child;
1800 int res = 0;
1801
1802 list_for_each_entry(child, &ex_root->children, siblings) {
1803 if (child->dev_type == EDGE_DEV ||
1804 child->dev_type == FANOUT_DEV) {
1805 struct sas_expander_device *ex =
1806 rphy_to_expander_device(child->rphy);
1807
1808 if (level > ex->level)
1809 res = sas_discover_bfs_by_root_level(child,
1810 level);
1811 else if (level == ex->level)
1812 res = sas_ex_discover_devices(child, -1);
1813 }
1814 }
1815 return res;
1816}
1817
1818static int sas_discover_bfs_by_root(struct domain_device *dev)
1819{
1820 int res;
1821 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1822 int level = ex->level+1;
1823
1824 res = sas_ex_discover_devices(dev, -1);
1825 if (res)
1826 goto out;
1827 do {
1828 res = sas_discover_bfs_by_root_level(dev, level);
1829 mb();
1830 level += 1;
1831 } while (level <= dev->port->disc.max_level);
1832out:
1833 return res;
1834}
1835
1836static int sas_discover_new(struct domain_device *dev, int phy_id)
1837{
1838 struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1839 struct domain_device *child;
19252de6
TP		 1840 bool found = false;
1841 int res, i;
2908d778
JB		 1842
1843 SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1844 SAS_ADDR(dev->sas_addr), phy_id);
1845 res = sas_ex_phy_discover(dev, phy_id);
1846 if (res)
1847 goto out;
19252de6
TP		 1848 /* to support the wide port inserted */
1849 for (i = 0; i < dev->ex_dev.num_phys; i++) {
1850 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i];
1851 if (i == phy_id)
1852 continue;
1853 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) ==
1854 SAS_ADDR(ex_phy->attached_sas_addr)) {
1855 found = true;
1856 break;
1857 }
1858 }
1859 if (found) {
1860 sas_ex_join_wide_port(dev, phy_id);
1861 return 0;
1862 }
2908d778 1863 res = sas_ex_discover_devices(dev, phy_id);
19252de6 1864 if (!res)
2908d778
JB		 1865 goto out;
1866 list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1867 if (SAS_ADDR(child->sas_addr) ==
1868 SAS_ADDR(ex_phy->attached_sas_addr)) {
1869 if (child->dev_type == EDGE_DEV ||
1870 child->dev_type == FANOUT_DEV)
1871 res = sas_discover_bfs_by_root(child);
1872 break;
1873 }
1874 }
1875out:
1876 return res;
1877}
1878
19252de6 1879static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
2908d778
JB		 1880{
1881 struct expander_device *ex = &dev->ex_dev;
1882 struct ex_phy *phy = &ex->ex_phy[phy_id];
1883 u8 attached_sas_addr[8];
1884 int res;
1885
1886 res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1887 switch (res) {
1888 case SMP_RESP_NO_PHY:
1889 phy->phy_state = PHY_NOT_PRESENT;
19252de6 1890 sas_unregister_devs_sas_addr(dev, phy_id, last);
2908d778
JB		 1891 goto out; break;
1892 case SMP_RESP_PHY_VACANT:
1893 phy->phy_state = PHY_VACANT;
19252de6 1894 sas_unregister_devs_sas_addr(dev, phy_id, last);
2908d778
JB		 1895 goto out; break;
1896 case SMP_RESP_FUNC_ACC:
1897 break;
1898 }
1899
1900 if (SAS_ADDR(attached_sas_addr) == 0) {
1901 phy->phy_state = PHY_EMPTY;
19252de6 1902 sas_unregister_devs_sas_addr(dev, phy_id, last);
2908d778
JB		 1903 } else if (SAS_ADDR(attached_sas_addr) ==
1904 SAS_ADDR(phy->attached_sas_addr)) {
1905 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1906 SAS_ADDR(dev->sas_addr), phy_id);
a01e70e5 1907 sas_ex_phy_discover(dev, phy_id);
2908d778
JB		 1908 } else
1909 res = sas_discover_new(dev, phy_id);
1910out:
1911 return res;
1912}
1913
19252de6
TP		 1914/**
1915 * sas_rediscover - revalidate the domain.
1916 * @dev:domain device to be detect.
1917 * @phy_id: the phy id will be detected.
1918 *
1919 * NOTE: this process _must_ quit (return) as soon as any connection
1920 * errors are encountered. Connection recovery is done elsewhere.
1921 * Discover process only interrogates devices in order to discover the
1922 * domain.For plugging out, we un-register the device only when it is
1923 * the last phy in the port, for other phys in this port, we just delete it
1924 * from the port.For inserting, we do discovery when it is the
1925 * first phy,for other phys in this port, we add it to the port to
1926 * forming the wide-port.
1927 */
2908d778
JB		 1928static int sas_rediscover(struct domain_device *dev, const int phy_id)
1929{
1930 struct expander_device *ex = &dev->ex_dev;
1931 struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1932 int res = 0;
1933 int i;
19252de6 1934 bool last = true; /* is this the last phy of the port */
2908d778
JB		 1935
1936 SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1937 SAS_ADDR(dev->sas_addr), phy_id);
1938
1939 if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1940 for (i = 0; i < ex->num_phys; i++) {
1941 struct ex_phy *phy = &ex->ex_phy[i];
1942
1943 if (i == phy_id)
1944 continue;
1945 if (SAS_ADDR(phy->attached_sas_addr) ==
1946 SAS_ADDR(changed_phy->attached_sas_addr)) {
1947 SAS_DPRINTK("phy%d part of wide port with "
1948 "phy%d\n", phy_id, i);
19252de6
TP		 1949 last = false;
1950 break;
2908d778
JB		 1951 }
1952 }
19252de6 1953 res = sas_rediscover_dev(dev, phy_id, last);
2908d778
JB		 1954 } else
1955 res = sas_discover_new(dev, phy_id);
2908d778
JB		 1956 return res;
1957}
1958
1959/**
1960 * sas_revalidate_domain -- revalidate the domain
1961 * @port: port to the domain of interest
1962 *
1963 * NOTE: this process _must_ quit (return) as soon as any connection
1964 * errors are encountered. Connection recovery is done elsewhere.
1965 * Discover process only interrogates devices in order to discover the
1966 * domain.
1967 */
1968int sas_ex_revalidate_domain(struct domain_device *port_dev)
1969{
1970 int res;
1971 struct domain_device *dev = NULL;
1972
1973 res = sas_find_bcast_dev(port_dev, &dev);
1974 if (res)
1975 goto out;
1976 if (dev) {
1977 struct expander_device *ex = &dev->ex_dev;
1978 int i = 0, phy_id;
1979
1980 do {
1981 phy_id = -1;
19252de6 1982 res = sas_find_bcast_phy(dev, &phy_id, i, true);
2908d778
JB		 1983 if (phy_id == -1)
1984 break;
1985 res = sas_rediscover(dev, phy_id);
1986 i = phy_id + 1;
1987 } while (i < ex->num_phys);
1988 }
1989out:
1990 return res;
1991}
1992
ba1fc175
FT		 1993int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1994 struct request *req)
1995{
1996 struct domain_device *dev;
2cd614c8 1997 int ret, type;
ba1fc175
FT		 1998 struct request *rsp = req->next_rq;
1999
2000 if (!rsp) {
2001 printk("%s: space for a smp response is missing\n",
cadbd4a5 2002 __func__);
ba1fc175
FT		 2003 return -EINVAL;
2004 }
2005
2cd614c8 2006 /* no rphy means no smp target support (ie aic94xx host) */
b98e66fa
JB		 2007 if (!rphy)
2008 return sas_smp_host_handler(shost, req, rsp);
2009
2cd614c8 2010 type = rphy->identify.device_type;
ba1fc175
FT		 2011
2012 if (type != SAS_EDGE_EXPANDER_DEVICE &&
2013 type != SAS_FANOUT_EXPANDER_DEVICE) {
2014 printk("%s: can we send a smp request to a device?\n",
cadbd4a5 2015 __func__);
ba1fc175
FT		 2016 return -EINVAL;
2017 }
2018
2019 dev = sas_find_dev_by_rphy(rphy);
2020 if (!dev) {
cadbd4a5 2021 printk("%s: fail to find a domain_device?\n", __func__);
ba1fc175
FT		 2022 return -EINVAL;
2023 }
2024
2025 /* do we need to support multiple segments? */
2026 if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2027 printk("%s: multiple segments req %u %u, rsp %u %u\n",
b0790410
TH		 2028 __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2029 rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
ba1fc175
FT		 2030 return -EINVAL;
2031 }
2032
b0790410
TH		 2033 ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2034 bio_data(rsp->bio), blk_rq_bytes(rsp));
2d4b63e1
JB		 2035 if (ret > 0) {
2036 /* positive number is the untransferred residual */
c3a4d78c 2037 rsp->resid_len = ret;
5f49f631 2038 req->resid_len = 0;
2d4b63e1 2039 ret = 0;
5f49f631
TH		 2040 } else if (ret == 0) {
2041 rsp->resid_len = 0;
2042 req->resid_len = 0;
2d4b63e1 2043 }
ba1fc175
FT		 2044
2045 return ret;
2046}
Linux kernel - Deliverables
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