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[SCSI] libsas: let libata recover links that fail to transmit initial sig-fis
[GitHub/mt8127/android_kernel_alcatel_ttab.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
b52df417 31#include <scsi/sas_ata.h>
2908d778
JB		 32#include <scsi/scsi_transport.h>
33#include <scsi/scsi_transport_sas.h>
34#include "../scsi_sas_internal.h"
35
36static int sas_discover_expander(struct domain_device *dev);
37static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
38static int sas_configure_phy(struct domain_device *dev, int phy_id,
39 u8 *sas_addr, int include);
40static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr);
41
2908d778
JB		 42/* ---------- SMP task management ---------- */
43
44static void smp_task_timedout(unsigned long _task)
45{
46 struct sas_task *task = (void *) _task;
47 unsigned long flags;
48
49 spin_lock_irqsave(&task->task_state_lock, flags);
50 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
51 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
52 spin_unlock_irqrestore(&task->task_state_lock, flags);
53
54 complete(&task->completion);
55}
56
57static void smp_task_done(struct sas_task *task)
58{
59 if (!del_timer(&task->timer))
60 return;
61 complete(&task->completion);
62}
63
64/* Give it some long enough timeout. In seconds. */
65#define SMP_TIMEOUT 10
66
67static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
68 void *resp, int resp_size)
69{
42961ee8 70 int res, retry;
71 struct sas_task *task = NULL;
2908d778
JB		 72 struct sas_internal *i =
73 to_sas_internal(dev->port->ha->core.shost->transportt);
74
89d3cf6a 75 mutex_lock(&dev->ex_dev.cmd_mutex);
42961ee8 76 for (retry = 0; retry < 3; retry++) {
3a9c5560
DW		 77 if (test_bit(SAS_DEV_GONE, &dev->state)) {
78 res = -ECOMM;
79 break;
80 }
81
42961ee8 82 task = sas_alloc_task(GFP_KERNEL);
89d3cf6a
JS		 83 if (!task) {
84 res = -ENOMEM;
85 break;
86 }
42961ee8 87 task->dev = dev;
88 task->task_proto = dev->tproto;
89 sg_init_one(&task->smp_task.smp_req, req, req_size);
90 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
2908d778 91
42961ee8 92 task->task_done = smp_task_done;
2908d778 93
42961ee8 94 task->timer.data = (unsigned long) task;
95 task->timer.function = smp_task_timedout;
96 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
97 add_timer(&task->timer);
2908d778 98
42961ee8 99 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
2908d778 100
42961ee8 101 if (res) {
102 del_timer(&task->timer);
103 SAS_DPRINTK("executing SMP task failed:%d\n", res);
89d3cf6a 104 break;
2908d778 105 }
42961ee8 106
107 wait_for_completion(&task->completion);
32e8ae36 108 res = -ECOMM;
42961ee8 109 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
110 SAS_DPRINTK("smp task timed out or aborted\n");
111 i->dft->lldd_abort_task(task);
112 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
113 SAS_DPRINTK("SMP task aborted and not done\n");
89d3cf6a 114 break;
42961ee8 115 }
116 }
117 if (task->task_status.resp == SAS_TASK_COMPLETE &&
df64d3ca 118 task->task_status.stat == SAM_STAT_GOOD) {
42961ee8 119 res = 0;
120 break;
89d3cf6a
JS		 121 }
122 if (task->task_status.resp == SAS_TASK_COMPLETE &&
123 task->task_status.stat == SAS_DATA_UNDERRUN) {
2d4b63e1
JB		 124 /* no error, but return the number of bytes of
125 * underrun */
126 res = task->task_status.residual;
127 break;
89d3cf6a
JS		 128 }
129 if (task->task_status.resp == SAS_TASK_COMPLETE &&
130 task->task_status.stat == SAS_DATA_OVERRUN) {
2d4b63e1
JB		 131 res = -EMSGSIZE;
132 break;
36a39947
DW		 133 }
134 if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
135 task->task_status.stat == SAS_DEVICE_UNKNOWN)
136 break;
137 else {
42961ee8 138 SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
cadbd4a5 139 "status 0x%x\n", __func__,
42961ee8 140 SAS_ADDR(dev->sas_addr),
141 task->task_status.resp,
142 task->task_status.stat);
143 sas_free_task(task);
144 task = NULL;
145 }
2908d778 146 }
89d3cf6a
JS		 147 mutex_unlock(&dev->ex_dev.cmd_mutex);
148
42961ee8 149 BUG_ON(retry == 3 && task != NULL);
89d3cf6a 150 sas_free_task(task);
2908d778
JB		 151 return res;
152}
153
154/* ---------- Allocations ---------- */
155
156static inline void *alloc_smp_req(int size)
157{
158 u8 *p = kzalloc(size, GFP_KERNEL);
159 if (p)
160 p[0] = SMP_REQUEST;
161 return p;
162}
163
164static inline void *alloc_smp_resp(int size)
165{
166 return kzalloc(size, GFP_KERNEL);
167}
168
d214d81e
DW		 169static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)
170{
171 switch (phy->routing_attr) {
172 case TABLE_ROUTING:
173 if (dev->ex_dev.t2t_supp)
174 return 'U';
175 else
176 return 'T';
177 case DIRECT_ROUTING:
178 return 'D';
179 case SUBTRACTIVE_ROUTING:
180 return 'S';
181 default:
182 return '?';
183 }
184}
2908d778 185
354cf829 186static enum sas_dev_type to_dev_type(struct discover_resp *dr)
2908d778 187{
354cf829
DW		 188 /* This is detecting a failure to transmit initial dev to host
189 * FIS as described in section J.5 of sas-2 r16
190 */
191 if (dr->attached_dev_type == NO_DEVICE && dr->attached_sata_dev &&
192 dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)
193 return SATA_PENDING;
194 else
195 return dr->attached_dev_type;
196}
197
198static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
199{
200 enum sas_dev_type dev_type;
201 enum sas_linkrate linkrate;
202 u8 sas_addr[SAS_ADDR_SIZE];
203 struct smp_resp *resp = rsp;
204 struct discover_resp *dr = &resp->disc;
2908d778
JB		 205 struct expander_device *ex = &dev->ex_dev;
206 struct ex_phy *phy = &ex->ex_phy[phy_id];
2908d778 207 struct sas_rphy *rphy = dev->rphy;
d214d81e
DW		 208 bool new_phy = !phy->phy;
209 char *type;
2908d778 210
d214d81e 211 if (new_phy) {
2908d778
JB		 212 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
213
214 /* FIXME: error_handling */
215 BUG_ON(!phy->phy);
216 }
217
218 switch (resp->result) {
219 case SMP_RESP_PHY_VACANT:
220 phy->phy_state = PHY_VACANT;
2bc72c91 221 break;
2908d778
JB		 222 default:
223 phy->phy_state = PHY_NOT_PRESENT;
2bc72c91 224 break;
2908d778
JB		 225 case SMP_RESP_FUNC_ACC:
226 phy->phy_state = PHY_EMPTY; /* do not know yet */
227 break;
228 }
229
354cf829
DW		 230 /* check if anything important changed to squelch debug */
231 dev_type = phy->attached_dev_type;
232 linkrate = phy->linkrate;
233 memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
234
235 phy->attached_dev_type = to_dev_type(dr);
2908d778 236 phy->phy_id = phy_id;
2908d778
JB		 237 phy->linkrate = dr->linkrate;
238 phy->attached_sata_host = dr->attached_sata_host;
239 phy->attached_sata_dev = dr->attached_sata_dev;
240 phy->attached_sata_ps = dr->attached_sata_ps;
241 phy->attached_iproto = dr->iproto << 1;
242 phy->attached_tproto = dr->tproto << 1;
243 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
244 phy->attached_phy_id = dr->attached_phy_id;
245 phy->phy_change_count = dr->change_count;
246 phy->routing_attr = dr->routing_attr;
247 phy->virtual = dr->virtual;
248 phy->last_da_index = -1;
249
bb041a0e 250 phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
354cf829 251 phy->phy->identify.device_type = dr->attached_dev_type;
2908d778
JB		 252 phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
253 phy->phy->identify.target_port_protocols = phy->attached_tproto;
254 phy->phy->identify.phy_identifier = phy_id;
a01e70e5
JB		 255 phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
256 phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
257 phy->phy->minimum_linkrate = dr->pmin_linkrate;
258 phy->phy->maximum_linkrate = dr->pmax_linkrate;
88edf746 259 phy->phy->negotiated_linkrate = phy->linkrate;
2908d778 260
d214d81e 261 if (new_phy)
2bc72c91
JW		 262 if (sas_phy_add(phy->phy)) {
263 sas_phy_free(phy->phy);
264 return;
265 }
2908d778 266
d214d81e 267 switch (phy->attached_dev_type) {
354cf829
DW		 268 case SATA_PENDING:
269 type = "stp pending";
270 break;
d214d81e
DW		 271 case NO_DEVICE:
272 type = "no device";
273 break;
274 case SAS_END_DEV:
275 if (phy->attached_iproto) {
276 if (phy->attached_tproto)
277 type = "host+target";
278 else
279 type = "host";
280 } else {
281 if (dr->attached_sata_dev)
282 type = "stp";
283 else
284 type = "ssp";
285 }
286 break;
287 case EDGE_DEV:
288 case FANOUT_DEV:
289 type = "smp";
290 break;
291 default:
292 type = "unknown";
293 }
2908d778 294
354cf829
DW		 295 /* this routine is polled by libata error recovery so filter
296 * unimportant messages
297 */
298 if (new_phy || phy->attached_dev_type != dev_type ||
299 phy->linkrate != linkrate ||
300 SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
301 /* pass */;
302 else
303 return;
304
d214d81e
DW		 305 SAS_DPRINTK("ex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
306 SAS_ADDR(dev->sas_addr), phy->phy_id,
307 sas_route_char(dev, phy), phy->linkrate,
308 SAS_ADDR(phy->attached_sas_addr), type);
2908d778
JB		 309}
310
b52df417 311/* check if we have an existing attached ata device on this expander phy */
81c757bc 312struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
b52df417
DW		 313{
314 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
315 struct domain_device *dev;
316 struct sas_rphy *rphy;
317
318 if (!ex_phy->port)
319 return NULL;
320
321 rphy = ex_phy->port->rphy;
322 if (!rphy)
323 return NULL;
324
325 dev = sas_find_dev_by_rphy(rphy);
326
327 if (dev && dev_is_sata(dev))
328 return dev;
329
330 return NULL;
331}
332
2908d778
JB		 333#define DISCOVER_REQ_SIZE 16
334#define DISCOVER_RESP_SIZE 56
335
1acce194
JB		 336static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
337 u8 *disc_resp, int single)
338{
354cf829
DW		 339 struct discover_resp *dr;
340 int res;
1acce194
JB		 341
342 disc_req[9] = single;
1acce194 343
354cf829
DW		 344 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
345 disc_resp, DISCOVER_RESP_SIZE);
346 if (res)
347 return res;
348 dr = &((struct smp_resp *)disc_resp)->disc;
349 if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
350 sas_printk("Found loopback topology, just ignore it!\n");
351 return 0;
1acce194
JB		 352 }
353 sas_set_ex_phy(dev, single, disc_resp);
354 return 0;
355}
356
354cf829 357int sas_ex_phy_discover(struct domain_device *dev, int single)
2908d778
JB		 358{
359 struct expander_device *ex = &dev->ex_dev;
360 int res = 0;
361 u8 *disc_req;
362 u8 *disc_resp;
363
364 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
365 if (!disc_req)
366 return -ENOMEM;
367
368 disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
369 if (!disc_resp) {
370 kfree(disc_req);
371 return -ENOMEM;
372 }
373
374 disc_req[1] = SMP_DISCOVER;
375
376 if (0 <= single && single < ex->num_phys) {
1acce194 377 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
2908d778
JB		 378 } else {
379 int i;
380
381 for (i = 0; i < ex->num_phys; i++) {
1acce194
JB		 382 res = sas_ex_phy_discover_helper(dev, disc_req,
383 disc_resp, i);
2908d778
JB		 384 if (res)
385 goto out_err;
2908d778
JB		 386 }
387 }
388out_err:
389 kfree(disc_resp);
390 kfree(disc_req);
391 return res;
392}
393
394static int sas_expander_discover(struct domain_device *dev)
395{
396 struct expander_device *ex = &dev->ex_dev;
397 int res = -ENOMEM;
398
399 ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
400 if (!ex->ex_phy)
401 return -ENOMEM;
402
403 res = sas_ex_phy_discover(dev, -1);
404 if (res)
405 goto out_err;
406
407 return 0;
408 out_err:
409 kfree(ex->ex_phy);
410 ex->ex_phy = NULL;
411 return res;
412}
413
414#define MAX_EXPANDER_PHYS 128
415
416static void ex_assign_report_general(struct domain_device *dev,
417 struct smp_resp *resp)
418{
419 struct report_general_resp *rg = &resp->rg;
420
421 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
422 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
423 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
ffaac8f4 424 dev->ex_dev.t2t_supp = rg->t2t_supp;
2908d778
JB		 425 dev->ex_dev.conf_route_table = rg->conf_route_table;
426 dev->ex_dev.configuring = rg->configuring;
427 memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
428}
429
430#define RG_REQ_SIZE 8
431#define RG_RESP_SIZE 32
432
433static int sas_ex_general(struct domain_device *dev)
434{
435 u8 *rg_req;
436 struct smp_resp *rg_resp;
437 int res;
438 int i;
439
440 rg_req = alloc_smp_req(RG_REQ_SIZE);
441 if (!rg_req)
442 return -ENOMEM;
443
444 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
445 if (!rg_resp) {
446 kfree(rg_req);
447 return -ENOMEM;
448 }
449
450 rg_req[1] = SMP_REPORT_GENERAL;
451
452 for (i = 0; i < 5; i++) {
453 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
454 RG_RESP_SIZE);
455
456 if (res) {
457 SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
458 SAS_ADDR(dev->sas_addr), res);
459 goto out;
460 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
461 SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
462 SAS_ADDR(dev->sas_addr), rg_resp->result);
463 res = rg_resp->result;
464 goto out;
465 }
466
467 ex_assign_report_general(dev, rg_resp);
468
469 if (dev->ex_dev.configuring) {
470 SAS_DPRINTK("RG: ex %llx self-configuring...\n",
471 SAS_ADDR(dev->sas_addr));
472 schedule_timeout_interruptible(5*HZ);
473 } else
474 break;
475 }
476out:
477 kfree(rg_req);
478 kfree(rg_resp);
479 return res;
480}
481
482static void ex_assign_manuf_info(struct domain_device *dev, void
483 *_mi_resp)
484{
485 u8 *mi_resp = _mi_resp;
486 struct sas_rphy *rphy = dev->rphy;
487 struct sas_expander_device *edev = rphy_to_expander_device(rphy);
488
489 memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
490 memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
491 memcpy(edev->product_rev, mi_resp + 36,
492 SAS_EXPANDER_PRODUCT_REV_LEN);
493
494 if (mi_resp[8] & 1) {
495 memcpy(edev->component_vendor_id, mi_resp + 40,
496 SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
497 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
498 edev->component_revision_id = mi_resp[50];
499 }
500}
501
502#define MI_REQ_SIZE 8
503#define MI_RESP_SIZE 64
504
505static int sas_ex_manuf_info(struct domain_device *dev)
506{
507 u8 *mi_req;
508 u8 *mi_resp;
509 int res;
510
511 mi_req = alloc_smp_req(MI_REQ_SIZE);
512 if (!mi_req)
513 return -ENOMEM;
514
515 mi_resp = alloc_smp_resp(MI_RESP_SIZE);
516 if (!mi_resp) {
517 kfree(mi_req);
518 return -ENOMEM;
519 }
520
521 mi_req[1] = SMP_REPORT_MANUF_INFO;
522
523 res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
524 if (res) {
525 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
526 SAS_ADDR(dev->sas_addr), res);
527 goto out;
528 } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
529 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
530 SAS_ADDR(dev->sas_addr), mi_resp[2]);
531 goto out;
532 }
533
534 ex_assign_manuf_info(dev, mi_resp);
535out:
536 kfree(mi_req);
537 kfree(mi_resp);
538 return res;
539}
540
541#define PC_REQ_SIZE 44
542#define PC_RESP_SIZE 8
543
544int sas_smp_phy_control(struct domain_device *dev, int phy_id,
a01e70e5
JB		 545 enum phy_func phy_func,
546 struct sas_phy_linkrates *rates)
2908d778
JB		 547{
548 u8 *pc_req;
549 u8 *pc_resp;
550 int res;
551
552 pc_req = alloc_smp_req(PC_REQ_SIZE);
553 if (!pc_req)
554 return -ENOMEM;
555
556 pc_resp = alloc_smp_resp(PC_RESP_SIZE);
557 if (!pc_resp) {
558 kfree(pc_req);
559 return -ENOMEM;
560 }
561
562 pc_req[1] = SMP_PHY_CONTROL;
563 pc_req[9] = phy_id;
564 pc_req[10]= phy_func;
a01e70e5
JB		 565 if (rates) {
566 pc_req[32] = rates->minimum_linkrate << 4;
567 pc_req[33] = rates->maximum_linkrate << 4;
568 }
2908d778
JB		 569
570 res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
571
572 kfree(pc_resp);
573 kfree(pc_req);
574 return res;
575}
576
577static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
578{
579 struct expander_device *ex = &dev->ex_dev;
580 struct ex_phy *phy = &ex->ex_phy[phy_id];
581
a01e70e5 582 sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
88edf746 583 phy->linkrate = SAS_PHY_DISABLED;
2908d778
JB		 584}
585
586static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
587{
588 struct expander_device *ex = &dev->ex_dev;
589 int i;
590
591 for (i = 0; i < ex->num_phys; i++) {
592 struct ex_phy *phy = &ex->ex_phy[i];
593
594 if (phy->phy_state == PHY_VACANT ||
595 phy->phy_state == PHY_NOT_PRESENT)
596 continue;
597
598 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
599 sas_ex_disable_phy(dev, i);
600 }
601}
602
603static int sas_dev_present_in_domain(struct asd_sas_port *port,
604 u8 *sas_addr)
605{
606 struct domain_device *dev;
607
608 if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
609 return 1;
610 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
611 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
612 return 1;
613 }
614 return 0;
615}
616
617#define RPEL_REQ_SIZE 16
618#define RPEL_RESP_SIZE 32
619int sas_smp_get_phy_events(struct sas_phy *phy)
620{
621 int res;
92631fa4
JJ		 622 u8 *req;
623 u8 *resp;
2908d778
JB		 624 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
625 struct domain_device *dev = sas_find_dev_by_rphy(rphy);
2908d778 626
92631fa4
JJ		 627 req = alloc_smp_req(RPEL_REQ_SIZE);
628 if (!req)
2908d778
JB		 629 return -ENOMEM;
630
92631fa4
JJ		 631 resp = alloc_smp_resp(RPEL_RESP_SIZE);
632 if (!resp) {
633 kfree(req);
634 return -ENOMEM;
635 }
636
2908d778
JB		 637 req[1] = SMP_REPORT_PHY_ERR_LOG;
638 req[9] = phy->number;
639
640 res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
641 resp, RPEL_RESP_SIZE);
642
643 if (!res)
644 goto out;
645
646 phy->invalid_dword_count = scsi_to_u32(&resp[12]);
647 phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
648 phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
649 phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
650
651 out:
652 kfree(resp);
653 return res;
654
655}
656
b9142174
JB		 657#ifdef CONFIG_SCSI_SAS_ATA
658
2908d778
JB		 659#define RPS_REQ_SIZE 16
660#define RPS_RESP_SIZE 60
661
354cf829
DW		 662int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
663 struct smp_resp *rps_resp)
2908d778
JB		 664{
665 int res;
666 u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
1acce194 667 u8 *resp = (u8 *)rps_resp;
2908d778
JB		 668
669 if (!rps_req)
670 return -ENOMEM;
671
672 rps_req[1] = SMP_REPORT_PHY_SATA;
673 rps_req[9] = phy_id;
674
675 res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
676 rps_resp, RPS_RESP_SIZE);
677
1acce194
JB		 678 /* 0x34 is the FIS type for the D2H fis. There's a potential
679 * standards cockup here. sas-2 explicitly specifies the FIS
680 * should be encoded so that FIS type is in resp[24].
681 * However, some expanders endian reverse this. Undo the
682 * reversal here */
683 if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
684 int i;
685
686 for (i = 0; i < 5; i++) {
687 int j = 24 + (i*4);
688 u8 a, b;
689 a = resp[j + 0];
690 b = resp[j + 1];
691 resp[j + 0] = resp[j + 3];
692 resp[j + 1] = resp[j + 2];
693 resp[j + 2] = b;
694 resp[j + 3] = a;
695 }
696 }
697
2908d778 698 kfree(rps_req);
1acce194 699 return res;
2908d778 700}
b9142174 701#endif
2908d778
JB		 702
703static void sas_ex_get_linkrate(struct domain_device *parent,
704 struct domain_device *child,
705 struct ex_phy *parent_phy)
706{
707 struct expander_device *parent_ex = &parent->ex_dev;
708 struct sas_port *port;
709 int i;
710
711 child->pathways = 0;
712
713 port = parent_phy->port;
714
715 for (i = 0; i < parent_ex->num_phys; i++) {
716 struct ex_phy *phy = &parent_ex->ex_phy[i];
717
718 if (phy->phy_state == PHY_VACANT ||
719 phy->phy_state == PHY_NOT_PRESENT)
720 continue;
721
722 if (SAS_ADDR(phy->attached_sas_addr) ==
723 SAS_ADDR(child->sas_addr)) {
724
725 child->min_linkrate = min(parent->min_linkrate,
726 phy->linkrate);
727 child->max_linkrate = max(parent->max_linkrate,
728 phy->linkrate);
729 child->pathways++;
730 sas_port_add_phy(port, phy->phy);
731 }
732 }
733 child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
734 child->pathways = min(child->pathways, parent->pathways);
735}
736
737static struct domain_device *sas_ex_discover_end_dev(
738 struct domain_device *parent, int phy_id)
739{
740 struct expander_device *parent_ex = &parent->ex_dev;
741 struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
742 struct domain_device *child = NULL;
743 struct sas_rphy *rphy;
744 int res;
745
746 if (phy->attached_sata_host || phy->attached_sata_ps)
747 return NULL;
748
735f7d2f 749 child = sas_alloc_device();
2908d778
JB		 750 if (!child)
751 return NULL;
752
735f7d2f 753 kref_get(&parent->kref);
2908d778
JB		 754 child->parent = parent;
755 child->port = parent->port;
756 child->iproto = phy->attached_iproto;
757 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
758 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
024879ea
JB		 759 if (!phy->port) {
760 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
761 if (unlikely(!phy->port))
762 goto out_err;
763 if (unlikely(sas_port_add(phy->port) != 0)) {
764 sas_port_free(phy->port);
765 goto out_err;
766 }
767 }
2908d778 768 sas_ex_get_linkrate(parent, child, phy);
f41a0c44 769 sas_device_set_phy(child, phy->port);
2908d778 770
b9142174 771#ifdef CONFIG_SCSI_SAS_ATA
5929faf3 772 if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
354cf829
DW		 773 res = sas_get_ata_info(child, phy);
774 if (res)
024879ea 775 goto out_free;
1acce194
JB		 776
777 rphy = sas_end_device_alloc(phy->port);
528fd552
JB		 778 if (unlikely(!rphy))
779 goto out_free;
1acce194 780
2908d778 781 sas_init_dev(child);
1acce194
JB		 782
783 child->rphy = rphy;
784
87c8331f 785 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
1acce194 786
2908d778
JB		 787 res = sas_discover_sata(child);
788 if (res) {
789 SAS_DPRINTK("sas_discover_sata() for device %16llx at "
790 "%016llx:0x%x returned 0x%x\n",
791 SAS_ADDR(child->sas_addr),
792 SAS_ADDR(parent->sas_addr), phy_id, res);
1acce194 793 goto out_list_del;
2908d778 794 }
b9142174
JB		 795 } else
796#endif
5929faf3 797 if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
2908d778
JB		 798 child->dev_type = SAS_END_DEV;
799 rphy = sas_end_device_alloc(phy->port);
800 /* FIXME: error handling */
024879ea
JB		 801 if (unlikely(!rphy))
802 goto out_free;
2908d778
JB		 803 child->tproto = phy->attached_tproto;
804 sas_init_dev(child);
805
806 child->rphy = rphy;
807 sas_fill_in_rphy(child, rphy);
808
9d720d82 809 spin_lock_irq(&parent->port->dev_list_lock);
2908d778 810 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 811 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 812
813 res = sas_discover_end_dev(child);
814 if (res) {
815 SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
816 "at %016llx:0x%x returned 0x%x\n",
817 SAS_ADDR(child->sas_addr),
818 SAS_ADDR(parent->sas_addr), phy_id, res);
024879ea 819 goto out_list_del;
2908d778
JB		 820 }
821 } else {
822 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
823 phy->attached_tproto, SAS_ADDR(parent->sas_addr),
824 phy_id);
b9142174 825 goto out_free;
2908d778
JB		 826 }
827
828 list_add_tail(&child->siblings, &parent_ex->children);
829 return child;
024879ea
JB		 830
831 out_list_del:
6f63caae
DW		 832 sas_rphy_free(child->rphy);
833 child->rphy = NULL;
1a34c064 834
87c8331f 835 list_del(&child->disco_list_node);
1a34c064 836 spin_lock_irq(&parent->port->dev_list_lock);
024879ea 837 list_del(&child->dev_list_node);
1a34c064 838 spin_unlock_irq(&parent->port->dev_list_lock);
024879ea
JB		 839 out_free:
840 sas_port_delete(phy->port);
841 out_err:
842 phy->port = NULL;
735f7d2f 843 sas_put_device(child);
024879ea 844 return NULL;
2908d778
JB		 845}
846
423f7cf4
DW		 847/* See if this phy is part of a wide port */
848static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
849{
850 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
851 int i;
852
853 for (i = 0; i < parent->ex_dev.num_phys; i++) {
854 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
855
856 if (ephy == phy)
857 continue;
858
859 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
860 SAS_ADDR_SIZE) && ephy->port) {
861 sas_port_add_phy(ephy->port, phy->phy);
19252de6 862 phy->port = ephy->port;
423f7cf4
DW		 863 phy->phy_state = PHY_DEVICE_DISCOVERED;
864 return 0;
865 }
866 }
867
868 return -ENODEV;
869}
870
2908d778
JB		 871static struct domain_device *sas_ex_discover_expander(
872 struct domain_device *parent, int phy_id)
873{
874 struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
875 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
876 struct domain_device *child = NULL;
877 struct sas_rphy *rphy;
878 struct sas_expander_device *edev;
879 struct asd_sas_port *port;
880 int res;
881
882 if (phy->routing_attr == DIRECT_ROUTING) {
883 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
884 "allowed\n",
885 SAS_ADDR(parent->sas_addr), phy_id,
886 SAS_ADDR(phy->attached_sas_addr),
887 phy->attached_phy_id);
888 return NULL;
889 }
735f7d2f 890 child = sas_alloc_device();
2908d778
JB		 891 if (!child)
892 return NULL;
893
894 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
895 /* FIXME: better error handling */
896 BUG_ON(sas_port_add(phy->port) != 0);
897
898
899 switch (phy->attached_dev_type) {
900 case EDGE_DEV:
901 rphy = sas_expander_alloc(phy->port,
902 SAS_EDGE_EXPANDER_DEVICE);
903 break;
904 case FANOUT_DEV:
905 rphy = sas_expander_alloc(phy->port,
906 SAS_FANOUT_EXPANDER_DEVICE);
907 break;
908 default:
909 rphy = NULL; /* shut gcc up */
910 BUG();
911 }
912 port = parent->port;
913 child->rphy = rphy;
914 edev = rphy_to_expander_device(rphy);
915 child->dev_type = phy->attached_dev_type;
735f7d2f 916 kref_get(&parent->kref);
2908d778
JB		 917 child->parent = parent;
918 child->port = port;
919 child->iproto = phy->attached_iproto;
920 child->tproto = phy->attached_tproto;
921 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
922 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
923 sas_ex_get_linkrate(parent, child, phy);
924 edev->level = parent_ex->level + 1;
925 parent->port->disc.max_level = max(parent->port->disc.max_level,
926 edev->level);
927 sas_init_dev(child);
928 sas_fill_in_rphy(child, rphy);
929 sas_rphy_add(rphy);
930
9d720d82 931 spin_lock_irq(&parent->port->dev_list_lock);
2908d778 932 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
9d720d82 933 spin_unlock_irq(&parent->port->dev_list_lock);
2908d778
JB		 934
935 res = sas_discover_expander(child);
936 if (res) {
5911e963
LT		 937 spin_lock_irq(&parent->port->dev_list_lock);
938 list_del(&child->dev_list_node);
939 spin_unlock_irq(&parent->port->dev_list_lock);
735f7d2f 940 sas_put_device(child);
2908d778
JB		 941 return NULL;
942 }
943 list_add_tail(&child->siblings, &parent->ex_dev.children);
944 return child;
945}
946
947static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
948{
949 struct expander_device *ex = &dev->ex_dev;
950 struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
951 struct domain_device *child = NULL;
952 int res = 0;
953
954 /* Phy state */
88edf746 955 if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
a01e70e5 956 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
2908d778
JB		 957 res = sas_ex_phy_discover(dev, phy_id);
958 if (res)
959 return res;
960 }
961
962 /* Parent and domain coherency */
963 if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
964 SAS_ADDR(dev->port->sas_addr))) {
965 sas_add_parent_port(dev, phy_id);
966 return 0;
967 }
968 if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
969 SAS_ADDR(dev->parent->sas_addr))) {
970 sas_add_parent_port(dev, phy_id);
971 if (ex_phy->routing_attr == TABLE_ROUTING)
972 sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
973 return 0;
974 }
975
976 if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
977 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
978
979 if (ex_phy->attached_dev_type == NO_DEVICE) {
980 if (ex_phy->routing_attr == DIRECT_ROUTING) {
981 memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
982 sas_configure_routing(dev, ex_phy->attached_sas_addr);
983 }
984 return 0;
88edf746 985 } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
2908d778
JB		 986 return 0;
987
988 if (ex_phy->attached_dev_type != SAS_END_DEV &&
989 ex_phy->attached_dev_type != FANOUT_DEV &&
354cf829
DW		 990 ex_phy->attached_dev_type != EDGE_DEV &&
991 ex_phy->attached_dev_type != SATA_PENDING) {
2908d778
JB		 992 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
993 "phy 0x%x\n", ex_phy->attached_dev_type,
994 SAS_ADDR(dev->sas_addr),
995 phy_id);
996 return 0;
997 }
998
999 res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
1000 if (res) {
1001 SAS_DPRINTK("configure routing for dev %016llx "
1002 "reported 0x%x. Forgotten\n",
1003 SAS_ADDR(ex_phy->attached_sas_addr), res);
1004 sas_disable_routing(dev, ex_phy->attached_sas_addr);
1005 return res;
1006 }
1007
423f7cf4
DW		 1008 res = sas_ex_join_wide_port(dev, phy_id);
1009 if (!res) {
1010 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
1011 phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
1012 return res;
1013 }
1014
2908d778
JB		 1015 switch (ex_phy->attached_dev_type) {
1016 case SAS_END_DEV:
354cf829 1017 case SATA_PENDING:
2908d778
JB		 1018 child = sas_ex_discover_end_dev(dev, phy_id);
1019 break;
1020 case FANOUT_DEV:
1021 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
1022 SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
1023 "attached to ex %016llx phy 0x%x\n",
1024 SAS_ADDR(ex_phy->attached_sas_addr),
1025 ex_phy->attached_phy_id,
1026 SAS_ADDR(dev->sas_addr),
1027 phy_id);
1028 sas_ex_disable_phy(dev, phy_id);
1029 break;
1030 } else
1031 memcpy(dev->port->disc.fanout_sas_addr,
1032 ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
1033 /* fallthrough */
1034 case EDGE_DEV:
1035 child = sas_ex_discover_expander(dev, phy_id);
1036 break;
1037 default:
1038 break;
1039 }
1040
1041 if (child) {
1042 int i;
1043
1044 for (i = 0; i < ex->num_phys; i++) {
1045 if (ex->ex_phy[i].phy_state == PHY_VACANT ||
1046 ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
1047 continue;
19252de6
TP		 1048 /*
1049 * Due to races, the phy might not get added to the
1050 * wide port, so we add the phy to the wide port here.
1051 */
2908d778 1052 if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
19252de6 1053 SAS_ADDR(child->sas_addr)) {
2908d778 1054 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
19252de6
TP		 1055 res = sas_ex_join_wide_port(dev, i);
1056 if (!res)
1057 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
1058 i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
1059
1060 }
2908d778
JB		 1061 }
1062 }
1063
1064 return res;
1065}
1066
1067static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
1068{
1069 struct expander_device *ex = &dev->ex_dev;
1070 int i;
1071
1072 for (i = 0; i < ex->num_phys; i++) {
1073 struct ex_phy *phy = &ex->ex_phy[i];
1074
1075 if (phy->phy_state == PHY_VACANT ||
1076 phy->phy_state == PHY_NOT_PRESENT)
1077 continue;
1078
1079 if ((phy->attached_dev_type == EDGE_DEV ||
1080 phy->attached_dev_type == FANOUT_DEV) &&
1081 phy->routing_attr == SUBTRACTIVE_ROUTING) {
1082
1083 memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1084
1085 return 1;
1086 }
1087 }
1088 return 0;
1089}
1090
1091static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1092{
1093 struct expander_device *ex = &dev->ex_dev;
1094 struct domain_device *child;
1095 u8 sub_addr[8] = {0, };
1096
1097 list_for_each_entry(child, &ex->children, siblings) {
1098 if (child->dev_type != EDGE_DEV &&
1099 child->dev_type != FANOUT_DEV)
1100 continue;
1101 if (sub_addr[0] == 0) {
1102 sas_find_sub_addr(child, sub_addr);
1103 continue;
1104 } else {
1105 u8 s2[8];
1106
1107 if (sas_find_sub_addr(child, s2) &&
1108 (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1109
1110 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1111 "diverges from subtractive "
1112 "boundary %016llx\n",
1113 SAS_ADDR(dev->sas_addr),
1114 SAS_ADDR(child->sas_addr),
1115 SAS_ADDR(s2),
1116 SAS_ADDR(sub_addr));
1117
1118 sas_ex_disable_port(child, s2);
1119 }
1120 }
1121 }
1122 return 0;
1123}
1124/**
1125 * sas_ex_discover_devices -- discover devices attached to this expander
1126 * dev: pointer to the expander domain device
1127 * single: if you want to do a single phy, else set to -1;
1128 *
1129 * Configure this expander for use with its devices and register the
1130 * devices of this expander.
1131 */
1132static int sas_ex_discover_devices(struct domain_device *dev, int single)
1133{
1134 struct expander_device *ex = &dev->ex_dev;
1135 int i = 0, end = ex->num_phys;
1136 int res = 0;
1137
1138 if (0 <= single && single < end) {
1139 i = single;
1140 end = i+1;
1141 }
1142
1143 for ( ; i < end; i++) {
1144 struct ex_phy *ex_phy = &ex->ex_phy[i];
1145
1146 if (ex_phy->phy_state == PHY_VACANT ||
1147 ex_phy->phy_state == PHY_NOT_PRESENT ||
1148 ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1149 continue;
1150
1151 switch (ex_phy->linkrate) {
88edf746
JB		 1152 case SAS_PHY_DISABLED:
1153 case SAS_PHY_RESET_PROBLEM:
1154 case SAS_SATA_PORT_SELECTOR:
2908d778
JB		 1155 continue;
1156 default:
1157 res = sas_ex_discover_dev(dev, i);
1158 if (res)
1159 break;
1160 continue;
1161 }
1162 }
1163
1164 if (!res)
1165 sas_check_level_subtractive_boundary(dev);
1166
1167 return res;
1168}
1169
1170static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1171{
1172 struct expander_device *ex = &dev->ex_dev;
1173 int i;
1174 u8 *sub_sas_addr = NULL;
1175
1176 if (dev->dev_type != EDGE_DEV)
1177 return 0;
1178
1179 for (i = 0; i < ex->num_phys; i++) {
1180 struct ex_phy *phy = &ex->ex_phy[i];
1181
1182 if (phy->phy_state == PHY_VACANT ||
1183 phy->phy_state == PHY_NOT_PRESENT)
1184 continue;
1185
1186 if ((phy->attached_dev_type == FANOUT_DEV ||
1187 phy->attached_dev_type == EDGE_DEV) &&
1188 phy->routing_attr == SUBTRACTIVE_ROUTING) {
1189
1190 if (!sub_sas_addr)
1191 sub_sas_addr = &phy->attached_sas_addr[0];
1192 else if (SAS_ADDR(sub_sas_addr) !=
1193 SAS_ADDR(phy->attached_sas_addr)) {
1194
1195 SAS_DPRINTK("ex %016llx phy 0x%x "
1196 "diverges(%016llx) on subtractive "
1197 "boundary(%016llx). Disabled\n",
1198 SAS_ADDR(dev->sas_addr), i,
1199 SAS_ADDR(phy->attached_sas_addr),
1200 SAS_ADDR(sub_sas_addr));
1201 sas_ex_disable_phy(dev, i);
1202 }
1203 }
1204 }
1205 return 0;
1206}
1207
1208static void sas_print_parent_topology_bug(struct domain_device *child,
1209 struct ex_phy *parent_phy,
1210 struct ex_phy *child_phy)
1211{
2908d778
JB		 1212 static const char *ex_type[] = {
1213 [EDGE_DEV] = "edge",
1214 [FANOUT_DEV] = "fanout",
1215 };
1216 struct domain_device *parent = child->parent;
1217
d214d81e
DW		 1218 sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx "
1219 "phy 0x%x has %c:%c routing link!\n",
2908d778
JB		 1220
1221 ex_type[parent->dev_type],
1222 SAS_ADDR(parent->sas_addr),
1223 parent_phy->phy_id,
1224
1225 ex_type[child->dev_type],
1226 SAS_ADDR(child->sas_addr),
1227 child_phy->phy_id,
1228
d214d81e
DW		 1229 sas_route_char(parent, parent_phy),
1230 sas_route_char(child, child_phy));
2908d778
JB		 1231}
1232
1233static int sas_check_eeds(struct domain_device *child,
1234 struct ex_phy *parent_phy,
1235 struct ex_phy *child_phy)
1236{
1237 int res = 0;
1238 struct domain_device *parent = child->parent;
1239
1240 if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1241 res = -ENODEV;
1242 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1243 "phy S:0x%x, while there is a fanout ex %016llx\n",
1244 SAS_ADDR(parent->sas_addr),
1245 parent_phy->phy_id,
1246 SAS_ADDR(child->sas_addr),
1247 child_phy->phy_id,
1248 SAS_ADDR(parent->port->disc.fanout_sas_addr));
1249 } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1250 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1251 SAS_ADDR_SIZE);
1252 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1253 SAS_ADDR_SIZE);
1254 } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1255 SAS_ADDR(parent->sas_addr)) ||
1256 (SAS_ADDR(parent->port->disc.eeds_a) ==
1257 SAS_ADDR(child->sas_addr)))
1258 &&
1259 ((SAS_ADDR(parent->port->disc.eeds_b) ==
1260 SAS_ADDR(parent->sas_addr)) ||
1261 (SAS_ADDR(parent->port->disc.eeds_b) ==
1262 SAS_ADDR(child->sas_addr))))
1263 ;
1264 else {
1265 res = -ENODEV;
1266 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1267 "phy 0x%x link forms a third EEDS!\n",
1268 SAS_ADDR(parent->sas_addr),
1269 parent_phy->phy_id,
1270 SAS_ADDR(child->sas_addr),
1271 child_phy->phy_id);
1272 }
1273
1274 return res;
1275}
1276
1277/* Here we spill over 80 columns. It is intentional.
1278 */
1279static int sas_check_parent_topology(struct domain_device *child)
1280{
1281 struct expander_device *child_ex = &child->ex_dev;
1282 struct expander_device *parent_ex;
1283 int i;
1284 int res = 0;
1285
1286 if (!child->parent)
1287 return 0;
1288
1289 if (child->parent->dev_type != EDGE_DEV &&
1290 child->parent->dev_type != FANOUT_DEV)
1291 return 0;
1292
1293 parent_ex = &child->parent->ex_dev;
1294
1295 for (i = 0; i < parent_ex->num_phys; i++) {
1296 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1297 struct ex_phy *child_phy;
1298
1299 if (parent_phy->phy_state == PHY_VACANT ||
1300 parent_phy->phy_state == PHY_NOT_PRESENT)
1301 continue;
1302
1303 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1304 continue;
1305
1306 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1307
1308 switch (child->parent->dev_type) {
1309 case EDGE_DEV:
1310 if (child->dev_type == FANOUT_DEV) {
1311 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1312 child_phy->routing_attr != TABLE_ROUTING) {
1313 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1314 res = -ENODEV;
1315 }
1316 } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1317 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1318 res = sas_check_eeds(child, parent_phy, child_phy);
1319 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1320 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1321 res = -ENODEV;
1322 }
ffaac8f4
LT		 1323 } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1324 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1325 (child_phy->routing_attr == TABLE_ROUTING &&
1326 child_ex->t2t_supp && parent_ex->t2t_supp)) {
1327 /* All good */;
1328 } else {
1329 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1330 res = -ENODEV;
1331 }
2908d778
JB		 1332 }
1333 break;
1334 case FANOUT_DEV:
1335 if (parent_phy->routing_attr != TABLE_ROUTING ||
1336 child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1337 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1338 res = -ENODEV;
1339 }
1340 break;
1341 default:
1342 break;
1343 }
1344 }
1345
1346 return res;
1347}
1348
1349#define RRI_REQ_SIZE 16
1350#define RRI_RESP_SIZE 44
1351
1352static int sas_configure_present(struct domain_device *dev, int phy_id,
1353 u8 *sas_addr, int *index, int *present)
1354{
1355 int i, res = 0;
1356 struct expander_device *ex = &dev->ex_dev;
1357 struct ex_phy *phy = &ex->ex_phy[phy_id];
1358 u8 *rri_req;
1359 u8 *rri_resp;
1360
1361 *present = 0;
1362 *index = 0;
1363
1364 rri_req = alloc_smp_req(RRI_REQ_SIZE);
1365 if (!rri_req)
1366 return -ENOMEM;
1367
1368 rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1369 if (!rri_resp) {
1370 kfree(rri_req);
1371 return -ENOMEM;
1372 }
1373
1374 rri_req[1] = SMP_REPORT_ROUTE_INFO;
1375 rri_req[9] = phy_id;
1376
1377 for (i = 0; i < ex->max_route_indexes ; i++) {
1378 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1379 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1380 RRI_RESP_SIZE);
1381 if (res)
1382 goto out;
1383 res = rri_resp[2];
1384 if (res == SMP_RESP_NO_INDEX) {
1385 SAS_DPRINTK("overflow of indexes: dev %016llx "
1386 "phy 0x%x index 0x%x\n",
1387 SAS_ADDR(dev->sas_addr), phy_id, i);
1388 goto out;
1389 } else if (res != SMP_RESP_FUNC_ACC) {
1390 SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
cadbd4a5 1391 "result 0x%x\n", __func__,
2908d778
JB		 1392 SAS_ADDR(dev->sas_addr), phy_id, i, res);
1393 goto out;
1394 }
1395 if (SAS_ADDR(sas_addr) != 0) {
1396 if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1397 *index = i;
1398 if ((rri_resp[12] & 0x80) == 0x80)
1399 *present = 0;
1400 else
1401 *present = 1;
1402 goto out;
1403 } else if (SAS_ADDR(rri_resp+16) == 0) {
1404 *index = i;
1405 *present = 0;
1406 goto out;
1407 }
1408 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1409 phy->last_da_index < i) {
1410 phy->last_da_index = i;
1411 *index = i;
1412 *present = 0;
1413 goto out;
1414 }
1415 }
1416 res = -1;
1417out:
1418 kfree(rri_req);
1419 kfree(rri_resp);
1420 return res;
1421}
1422
1423#define CRI_REQ_SIZE 44
1424#define CRI_RESP_SIZE 8
1425
1426static int sas_configure_set(struct domain_device *dev, int phy_id,
1427 u8 *sas_addr, int index, int include)
1428{
1429 int res;
1430 u8 *cri_req;
1431 u8 *cri_resp;
1432
1433 cri_req = alloc_smp_req(CRI_REQ_SIZE);
1434 if (!cri_req)
1435 return -ENOMEM;
1436
1437 cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1438 if (!cri_resp) {
1439 kfree(cri_req);
1440 return -ENOMEM;
1441 }
1442
1443 cri_req[1] = SMP_CONF_ROUTE_INFO;
1444 *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1445 cri_req[9] = phy_id;
1446 if (SAS_ADDR(sas_addr) == 0 || !include)
1447 cri_req[12] |= 0x80;
1448 memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1449
1450 res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1451 CRI_RESP_SIZE);
1452 if (res)
1453 goto out;
1454 res = cri_resp[2];
1455 if (res == SMP_RESP_NO_INDEX) {
1456 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1457 "index 0x%x\n",
1458 SAS_ADDR(dev->sas_addr), phy_id, index);
1459 }
1460out:
1461 kfree(cri_req);
1462 kfree(cri_resp);
1463 return res;
1464}
1465
1466static int sas_configure_phy(struct domain_device *dev, int phy_id,
1467 u8 *sas_addr, int include)
1468{
1469 int index;
1470 int present;
1471 int res;
1472
1473 res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1474 if (res)
1475 return res;
1476 if (include ^ present)
1477 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1478
1479 return res;
1480}
1481
1482/**
1483 * sas_configure_parent -- configure routing table of parent
1484 * parent: parent expander
1485 * child: child expander
1486 * sas_addr: SAS port identifier of device directly attached to child
1487 */
1488static int sas_configure_parent(struct domain_device *parent,
1489 struct domain_device *child,
1490 u8 *sas_addr, int include)
1491{
1492 struct expander_device *ex_parent = &parent->ex_dev;
1493 int res = 0;
1494 int i;
1495
1496 if (parent->parent) {
1497 res = sas_configure_parent(parent->parent, parent, sas_addr,
1498 include);
1499 if (res)
1500 return res;
1501 }
1502
1503 if (ex_parent->conf_route_table == 0) {
1504 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1505 SAS_ADDR(parent->sas_addr));
1506 return 0;
1507 }
1508
1509 for (i = 0; i < ex_parent->num_phys; i++) {
1510 struct ex_phy *phy = &ex_parent->ex_phy[i];
1511
1512 if ((phy->routing_attr == TABLE_ROUTING) &&
1513 (SAS_ADDR(phy->attached_sas_addr) ==
1514 SAS_ADDR(child->sas_addr))) {
1515 res = sas_configure_phy(parent, i, sas_addr, include);
1516 if (res)
1517 return res;
1518 }
1519 }
1520
1521 return res;
1522}
1523
1524/**
1525 * sas_configure_routing -- configure routing
1526 * dev: expander device
1527 * sas_addr: port identifier of device directly attached to the expander device
1528 */
1529static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1530{
1531 if (dev->parent)
1532 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1533 return 0;
1534}
1535
1536static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr)
1537{
1538 if (dev->parent)
1539 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1540 return 0;
1541}
1542
2908d778
JB		 1543/**
1544 * sas_discover_expander -- expander discovery
1545 * @ex: pointer to expander domain device
1546 *
1547 * See comment in sas_discover_sata().
1548 */
1549static int sas_discover_expander(struct domain_device *dev)
1550{
1551 int res;
1552
1553 res = sas_notify_lldd_dev_found(dev);
1554 if (res)
1555 return res;
1556
1557 res = sas_ex_general(dev);
1558 if (res)
1559 goto out_err;
1560 res = sas_ex_manuf_info(dev);
1561 if (res)
1562 goto out_err;
1563
1564 res = sas_expander_discover(dev);
1565 if (res) {
1566 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1567 SAS_ADDR(dev->sas_addr), res);
1568 goto out_err;
1569 }
1570
1571 sas_check_ex_subtractive_boundary(dev);
1572 res = sas_check_parent_topology(dev);
1573 if (res)
1574 goto out_err;
1575 return 0;
1576out_err:
1577 sas_notify_lldd_dev_gone(dev);
1578 return res;
1579}
1580
1581static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1582{
1583 int res = 0;
1584 struct domain_device *dev;
1585
1586 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1587 if (dev->dev_type == EDGE_DEV ||
1588 dev->dev_type == FANOUT_DEV) {
1589 struct sas_expander_device *ex =
1590 rphy_to_expander_device(dev->rphy);
1591
1592 if (level == ex->level)
1593 res = sas_ex_discover_devices(dev, -1);
1594 else if (level > 0)
1595 res = sas_ex_discover_devices(port->port_dev, -1);
1596
1597 }
1598 }
1599
1600 return res;
1601}
1602
1603static int sas_ex_bfs_disc(struct asd_sas_port *port)
1604{
1605 int res;
1606 int level;
1607
1608 do {
1609 level = port->disc.max_level;
1610 res = sas_ex_level_discovery(port, level);
1611 mb();
1612 } while (level < port->disc.max_level);
1613
1614 return res;
1615}
1616
1617int sas_discover_root_expander(struct domain_device *dev)
1618{
1619 int res;
1620 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1621
bf451207
DW		 1622 res = sas_rphy_add(dev->rphy);
1623 if (res)
1624 goto out_err;
2908d778
JB		 1625
1626 ex->level = dev->port->disc.max_level; /* 0 */
1627 res = sas_discover_expander(dev);
bf451207
DW		 1628 if (res)
1629 goto out_err2;
1630
1631 sas_ex_bfs_disc(dev->port);
2908d778
JB		 1632
1633 return res;
bf451207
DW		 1634
1635out_err2:
6f63caae 1636 sas_rphy_remove(dev->rphy);
bf451207 1637out_err:
bf451207 1638 return res;
2908d778
JB		 1639}
1640
1641/* ---------- Domain revalidation ---------- */
1642
1643static int sas_get_phy_discover(struct domain_device *dev,
1644 int phy_id, struct smp_resp *disc_resp)
1645{
1646 int res;
1647 u8 *disc_req;
1648
1649 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1650 if (!disc_req)
1651 return -ENOMEM;
1652
1653 disc_req[1] = SMP_DISCOVER;
1654 disc_req[9] = phy_id;
1655
1656 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1657 disc_resp, DISCOVER_RESP_SIZE);
1658 if (res)
1659 goto out;
1660 else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1661 res = disc_resp->result;
1662 goto out;
1663 }
1664out:
1665 kfree(disc_req);
1666 return res;
1667}
1668
1669static int sas_get_phy_change_count(struct domain_device *dev,
1670 int phy_id, int *pcc)
1671{
1672 int res;
1673 struct smp_resp *disc_resp;
1674
1675 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1676 if (!disc_resp)
1677 return -ENOMEM;
1678
1679 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1680 if (!res)
1681 *pcc = disc_resp->disc.change_count;
1682
1683 kfree(disc_resp);
1684 return res;
1685}
1686
354cf829
DW		 1687static int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
1688 u8 *sas_addr, enum sas_dev_type *type)
2908d778
JB		 1689{
1690 int res;
1691 struct smp_resp *disc_resp;
1692 struct discover_resp *dr;
1693
1694 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1695 if (!disc_resp)
1696 return -ENOMEM;
1697 dr = &disc_resp->disc;
1698
1699 res = sas_get_phy_discover(dev, phy_id, disc_resp);
354cf829
DW		 1700 if (res == 0) {
1701 memcpy(sas_addr, disc_resp->disc.attached_sas_addr, 8);
1702 *type = to_dev_type(dr);
1703 if (*type == 0)
1704 memset(sas_addr, 0, 8);
2908d778
JB		 1705 }
1706 kfree(disc_resp);
1707 return res;
1708}
1709
1710static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
19252de6 1711 int from_phy, bool update)
2908d778
JB		 1712{
1713 struct expander_device *ex = &dev->ex_dev;
1714 int res = 0;
1715 int i;
1716
1717 for (i = from_phy; i < ex->num_phys; i++) {
1718 int phy_change_count = 0;
1719
1720 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1721 if (res)
1722 goto out;
1723 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
19252de6
TP		 1724 if (update)
1725 ex->ex_phy[i].phy_change_count =
1726 phy_change_count;
2908d778
JB		 1727 *phy_id = i;
1728 return 0;
1729 }
1730 }
1731out:
1732 return res;
1733}
1734
1735static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1736{
1737 int res;
1738 u8 *rg_req;
1739 struct smp_resp *rg_resp;
1740
1741 rg_req = alloc_smp_req(RG_REQ_SIZE);
1742 if (!rg_req)
1743 return -ENOMEM;
1744
1745 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1746 if (!rg_resp) {
1747 kfree(rg_req);
1748 return -ENOMEM;
1749 }
1750
1751 rg_req[1] = SMP_REPORT_GENERAL;
1752
1753 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1754 RG_RESP_SIZE);
1755 if (res)
1756 goto out;
1757 if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1758 res = rg_resp->result;
1759 goto out;
1760 }
1761
1762 *ecc = be16_to_cpu(rg_resp->rg.change_count);
1763out:
1764 kfree(rg_resp);
1765 kfree(rg_req);
1766 return res;
1767}
19252de6
TP		 1768/**
1769 * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE).
1770 * @dev:domain device to be detect.
1771 * @src_dev: the device which originated BROADCAST(CHANGE).
1772 *
1773 * Add self-configuration expander suport. Suppose two expander cascading,
1774 * when the first level expander is self-configuring, hotplug the disks in
1775 * second level expander, BROADCAST(CHANGE) will not only be originated
1776 * in the second level expander, but also be originated in the first level
1777 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1778 * expander changed count in two level expanders will all increment at least
1779 * once, but the phy which chang count has changed is the source device which
1780 * we concerned.
1781 */
2908d778
JB		 1782
1783static int sas_find_bcast_dev(struct domain_device *dev,
1784 struct domain_device **src_dev)
1785{
1786 struct expander_device *ex = &dev->ex_dev;
1787 int ex_change_count = -1;
19252de6 1788 int phy_id = -1;
2908d778 1789 int res;
19252de6 1790 struct domain_device *ch;
2908d778
JB		 1791
1792 res = sas_get_ex_change_count(dev, &ex_change_count);
1793 if (res)
1794 goto out;
19252de6
TP		 1795 if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1796 /* Just detect if this expander phys phy change count changed,
1797 * in order to determine if this expander originate BROADCAST,
1798 * and do not update phy change count field in our structure.
1799 */
1800 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1801 if (phy_id != -1) {
1802 *src_dev = dev;
1803 ex->ex_change_count = ex_change_count;
1804 SAS_DPRINTK("Expander phy change count has changed\n");
1805 return res;
1806 } else
1807 SAS_DPRINTK("Expander phys DID NOT change\n");
1808 }
1809 list_for_each_entry(ch, &ex->children, siblings) {
1810 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1811 res = sas_find_bcast_dev(ch, src_dev);
24926dad 1812 if (*src_dev)
19252de6 1813 return res;
2908d778
JB		 1814 }
1815 }
1816out:
1817 return res;
1818}
1819
1a34c064 1820static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
2908d778
JB		 1821{
1822 struct expander_device *ex = &dev->ex_dev;
1823 struct domain_device *child, *n;
1824
1825 list_for_each_entry_safe(child, n, &ex->children, siblings) {
e139942d 1826 set_bit(SAS_DEV_GONE, &child->state);
2908d778
JB		 1827 if (child->dev_type == EDGE_DEV ||
1828 child->dev_type == FANOUT_DEV)
1a34c064 1829 sas_unregister_ex_tree(port, child);
2908d778 1830 else
1a34c064 1831 sas_unregister_dev(port, child);
2908d778 1832 }
1a34c064 1833 sas_unregister_dev(port, dev);
2908d778
JB		 1834}
1835
1836static void sas_unregister_devs_sas_addr(struct domain_device *parent,
19252de6 1837 int phy_id, bool last)
2908d778
JB		 1838{
1839 struct expander_device *ex_dev = &parent->ex_dev;
1840 struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
f41a0c44 1841 struct domain_device *child, *n, *found = NULL;
19252de6
TP		 1842 if (last) {
1843 list_for_each_entry_safe(child, n,
1844 &ex_dev->children, siblings) {
1845 if (SAS_ADDR(child->sas_addr) ==
1846 SAS_ADDR(phy->attached_sas_addr)) {
e139942d 1847 set_bit(SAS_DEV_GONE, &child->state);
19252de6
TP		 1848 if (child->dev_type == EDGE_DEV ||
1849 child->dev_type == FANOUT_DEV)
1a34c064 1850 sas_unregister_ex_tree(parent->port, child);
19252de6 1851 else
1a34c064 1852 sas_unregister_dev(parent->port, child);
f41a0c44 1853 found = child;
19252de6
TP		 1854 break;
1855 }
2908d778 1856 }
19252de6 1857 sas_disable_routing(parent, phy->attached_sas_addr);
2908d778 1858 }
2908d778 1859 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
a73914c3
MS		 1860 if (phy->port) {
1861 sas_port_delete_phy(phy->port, phy->phy);
f41a0c44 1862 sas_device_set_phy(found, phy->port);
a73914c3
MS		 1863 if (phy->port->num_phys == 0)
1864 sas_port_delete(phy->port);
1865 phy->port = NULL;
1866 }
2908d778
JB		 1867}
1868
1869static int sas_discover_bfs_by_root_level(struct domain_device *root,
1870 const int level)
1871{
1872 struct expander_device *ex_root = &root->ex_dev;
1873 struct domain_device *child;
1874 int res = 0;
1875
1876 list_for_each_entry(child, &ex_root->children, siblings) {
1877 if (child->dev_type == EDGE_DEV ||
1878 child->dev_type == FANOUT_DEV) {
1879 struct sas_expander_device *ex =
1880 rphy_to_expander_device(child->rphy);
1881
1882 if (level > ex->level)
1883 res = sas_discover_bfs_by_root_level(child,
1884 level);
1885 else if (level == ex->level)
1886 res = sas_ex_discover_devices(child, -1);
1887 }
1888 }
1889 return res;
1890}
1891
1892static int sas_discover_bfs_by_root(struct domain_device *dev)
1893{
1894 int res;
1895 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1896 int level = ex->level+1;
1897
1898 res = sas_ex_discover_devices(dev, -1);
1899 if (res)
1900 goto out;
1901 do {
1902 res = sas_discover_bfs_by_root_level(dev, level);
1903 mb();
1904 level += 1;
1905 } while (level <= dev->port->disc.max_level);
1906out:
1907 return res;
1908}
1909
1910static int sas_discover_new(struct domain_device *dev, int phy_id)
1911{
1912 struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1913 struct domain_device *child;
19252de6
TP		 1914 bool found = false;
1915 int res, i;
2908d778
JB		 1916
1917 SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1918 SAS_ADDR(dev->sas_addr), phy_id);
1919 res = sas_ex_phy_discover(dev, phy_id);
1920 if (res)
1921 goto out;
19252de6
TP		 1922 /* to support the wide port inserted */
1923 for (i = 0; i < dev->ex_dev.num_phys; i++) {
1924 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i];
1925 if (i == phy_id)
1926 continue;
1927 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) ==
1928 SAS_ADDR(ex_phy->attached_sas_addr)) {
1929 found = true;
1930 break;
1931 }
1932 }
1933 if (found) {
1934 sas_ex_join_wide_port(dev, phy_id);
1935 return 0;
1936 }
2908d778 1937 res = sas_ex_discover_devices(dev, phy_id);
19252de6 1938 if (!res)
2908d778
JB		 1939 goto out;
1940 list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1941 if (SAS_ADDR(child->sas_addr) ==
1942 SAS_ADDR(ex_phy->attached_sas_addr)) {
1943 if (child->dev_type == EDGE_DEV ||
1944 child->dev_type == FANOUT_DEV)
1945 res = sas_discover_bfs_by_root(child);
1946 break;
1947 }
1948 }
1949out:
1950 return res;
1951}
1952
354cf829
DW		 1953static bool dev_type_flutter(enum sas_dev_type new, enum sas_dev_type old)
1954{
1955 if (old == new)
1956 return true;
1957
1958 /* treat device directed resets as flutter, if we went
1959 * SAS_END_DEV to SATA_PENDING the link needs recovery
1960 */
1961 if ((old == SATA_PENDING && new == SAS_END_DEV) ||
1962 (old == SAS_END_DEV && new == SATA_PENDING))
1963 return true;
1964
1965 return false;
1966}
1967
19252de6 1968static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
2908d778
JB		 1969{
1970 struct expander_device *ex = &dev->ex_dev;
1971 struct ex_phy *phy = &ex->ex_phy[phy_id];
354cf829
DW		 1972 enum sas_dev_type type = NO_DEVICE;
1973 u8 sas_addr[8];
2908d778
JB		 1974 int res;
1975
354cf829 1976 res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
2908d778
JB		 1977 switch (res) {
1978 case SMP_RESP_NO_PHY:
1979 phy->phy_state = PHY_NOT_PRESENT;
19252de6 1980 sas_unregister_devs_sas_addr(dev, phy_id, last);
354cf829 1981 return res;
2908d778
JB		 1982 case SMP_RESP_PHY_VACANT:
1983 phy->phy_state = PHY_VACANT;
19252de6 1984 sas_unregister_devs_sas_addr(dev, phy_id, last);
354cf829 1985 return res;
2908d778
JB		 1986 case SMP_RESP_FUNC_ACC:
1987 break;
1988 }
1989
354cf829 1990 if (SAS_ADDR(sas_addr) == 0) {
2908d778 1991 phy->phy_state = PHY_EMPTY;
19252de6 1992 sas_unregister_devs_sas_addr(dev, phy_id, last);
354cf829
DW		 1993 return res;
1994 } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
1995 dev_type_flutter(type, phy->attached_dev_type)) {
1996 struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
1997 char *action = "";
1998
a01e70e5 1999 sas_ex_phy_discover(dev, phy_id);
354cf829
DW		 2000
2001 if (ata_dev && phy->attached_dev_type == SATA_PENDING)
2002 action = ", needs recovery";
2003 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter%s\n",
2004 SAS_ADDR(dev->sas_addr), phy_id, action);
2005 return res;
2006 }
2007
2008 return sas_discover_new(dev, phy_id);
2908d778
JB		 2009}
2010
19252de6
TP		 2011/**
2012 * sas_rediscover - revalidate the domain.
2013 * @dev:domain device to be detect.
2014 * @phy_id: the phy id will be detected.
2015 *
2016 * NOTE: this process _must_ quit (return) as soon as any connection
2017 * errors are encountered. Connection recovery is done elsewhere.
2018 * Discover process only interrogates devices in order to discover the
2019 * domain.For plugging out, we un-register the device only when it is
2020 * the last phy in the port, for other phys in this port, we just delete it
2021 * from the port.For inserting, we do discovery when it is the
2022 * first phy,for other phys in this port, we add it to the port to
2023 * forming the wide-port.
2024 */
2908d778
JB		 2025static int sas_rediscover(struct domain_device *dev, const int phy_id)
2026{
2027 struct expander_device *ex = &dev->ex_dev;
2028 struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
2029 int res = 0;
2030 int i;
19252de6 2031 bool last = true; /* is this the last phy of the port */
2908d778
JB		 2032
2033 SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
2034 SAS_ADDR(dev->sas_addr), phy_id);
2035
2036 if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
2037 for (i = 0; i < ex->num_phys; i++) {
2038 struct ex_phy *phy = &ex->ex_phy[i];
2039
2040 if (i == phy_id)
2041 continue;
2042 if (SAS_ADDR(phy->attached_sas_addr) ==
2043 SAS_ADDR(changed_phy->attached_sas_addr)) {
2044 SAS_DPRINTK("phy%d part of wide port with "
2045 "phy%d\n", phy_id, i);
19252de6
TP		 2046 last = false;
2047 break;
2908d778
JB		 2048 }
2049 }
19252de6 2050 res = sas_rediscover_dev(dev, phy_id, last);
2908d778
JB		 2051 } else
2052 res = sas_discover_new(dev, phy_id);
2908d778
JB		 2053 return res;
2054}
2055
2056/**
2057 * sas_revalidate_domain -- revalidate the domain
2058 * @port: port to the domain of interest
2059 *
2060 * NOTE: this process _must_ quit (return) as soon as any connection
2061 * errors are encountered. Connection recovery is done elsewhere.
2062 * Discover process only interrogates devices in order to discover the
2063 * domain.
2064 */
2065int sas_ex_revalidate_domain(struct domain_device *port_dev)
2066{
2067 int res;
2068 struct domain_device *dev = NULL;
2069
2070 res = sas_find_bcast_dev(port_dev, &dev);
2071 if (res)
2072 goto out;
2073 if (dev) {
2074 struct expander_device *ex = &dev->ex_dev;
2075 int i = 0, phy_id;
2076
2077 do {
2078 phy_id = -1;
19252de6 2079 res = sas_find_bcast_phy(dev, &phy_id, i, true);
2908d778
JB		 2080 if (phy_id == -1)
2081 break;
2082 res = sas_rediscover(dev, phy_id);
2083 i = phy_id + 1;
2084 } while (i < ex->num_phys);
2085 }
2086out:
2087 return res;
2088}
2089
ba1fc175
FT		 2090int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
2091 struct request *req)
2092{
2093 struct domain_device *dev;
2cd614c8 2094 int ret, type;
ba1fc175
FT		 2095 struct request *rsp = req->next_rq;
2096
2097 if (!rsp) {
2098 printk("%s: space for a smp response is missing\n",
cadbd4a5 2099 __func__);
ba1fc175
FT		 2100 return -EINVAL;
2101 }
2102
2cd614c8 2103 /* no rphy means no smp target support (ie aic94xx host) */
b98e66fa
JB		 2104 if (!rphy)
2105 return sas_smp_host_handler(shost, req, rsp);
2106
2cd614c8 2107 type = rphy->identify.device_type;
ba1fc175
FT		 2108
2109 if (type != SAS_EDGE_EXPANDER_DEVICE &&
2110 type != SAS_FANOUT_EXPANDER_DEVICE) {
2111 printk("%s: can we send a smp request to a device?\n",
cadbd4a5 2112 __func__);
ba1fc175
FT		 2113 return -EINVAL;
2114 }
2115
2116 dev = sas_find_dev_by_rphy(rphy);
2117 if (!dev) {
cadbd4a5 2118 printk("%s: fail to find a domain_device?\n", __func__);
ba1fc175
FT		 2119 return -EINVAL;
2120 }
2121
2122 /* do we need to support multiple segments? */
2123 if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2124 printk("%s: multiple segments req %u %u, rsp %u %u\n",
b0790410
TH		 2125 __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
2126 rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
ba1fc175
FT		 2127 return -EINVAL;
2128 }
2129
b0790410
TH		 2130 ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2131 bio_data(rsp->bio), blk_rq_bytes(rsp));
2d4b63e1
JB		 2132 if (ret > 0) {
2133 /* positive number is the untransferred residual */
c3a4d78c 2134 rsp->resid_len = ret;
5f49f631 2135 req->resid_len = 0;
2d4b63e1 2136 ret = 0;
5f49f631
TH		 2137 } else if (ret == 0) {
2138 rsp->resid_len = 0;
2139 req->resid_len = 0;
2d4b63e1 2140 }
ba1fc175
FT		 2141
2142 return ret;
2143}
kernel source for telekom puls (alcatel/mediatek)