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iwlwifi: fix skb usage after free
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / libsas / sas_expander.c
blob33cf988c8c8a2cd25548ce5be0f67d97ee58e997
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
25 #include <linux/scatterlist.h>
26 #include <linux/blkdev.h>
27
28 #include "sas_internal.h"
29
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_sas.h>
32 #include "../scsi_sas_internal.h"
33
34 static int sas_discover_expander(struct domain_device *dev);
35 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
36 static int sas_configure_phy(struct domain_device *dev, int phy_id,
37 u8 *sas_addr, int include);
38 static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr);
39
40 /* ---------- SMP task management ---------- */
41
42 static void smp_task_timedout(unsigned long _task)
43 {
44 struct sas_task *task = (void *) _task;
45 unsigned long flags;
46
47 spin_lock_irqsave(&task->task_state_lock, flags);
48 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
49 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
50 spin_unlock_irqrestore(&task->task_state_lock, flags);
51
52 complete(&task->completion);
53 }
54
55 static void smp_task_done(struct sas_task *task)
56 {
57 if (!del_timer(&task->timer))
58 return;
59 complete(&task->completion);
60 }
61
62 /* Give it some long enough timeout. In seconds. */
63 #define SMP_TIMEOUT 10
64
65 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
66 void *resp, int resp_size)
67 {
68 int res, retry;
69 struct sas_task *task = NULL;
70 struct sas_internal *i =
71 to_sas_internal(dev->port->ha->core.shost->transportt);
72
73 for (retry = 0; retry < 3; retry++) {
74 task = sas_alloc_task(GFP_KERNEL);
75 if (!task)
76 return -ENOMEM;
77
78 task->dev = dev;
79 task->task_proto = dev->tproto;
80 sg_init_one(&task->smp_task.smp_req, req, req_size);
81 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
82
83 task->task_done = smp_task_done;
84
85 task->timer.data = (unsigned long) task;
86 task->timer.function = smp_task_timedout;
87 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
88 add_timer(&task->timer);
89
90 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
91
92 if (res) {
93 del_timer(&task->timer);
94 SAS_DPRINTK("executing SMP task failed:%d\n", res);
95 goto ex_err;
96 }
97
98 wait_for_completion(&task->completion);
99 res = -ECOMM;
100 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
101 SAS_DPRINTK("smp task timed out or aborted\n");
102 i->dft->lldd_abort_task(task);
103 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
104 SAS_DPRINTK("SMP task aborted and not done\n");
105 goto ex_err;
106 }
107 }
108 if (task->task_status.resp == SAS_TASK_COMPLETE &&
109 task->task_status.stat == SAM_GOOD) {
110 res = 0;
111 break;
112 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
113 task->task_status.stat == SAS_DATA_UNDERRUN) {
114 /* no error, but return the number of bytes of
115 * underrun */
116 res = task->task_status.residual;
117 break;
118 } if (task->task_status.resp == SAS_TASK_COMPLETE &&
119 task->task_status.stat == SAS_DATA_OVERRUN) {
120 res = -EMSGSIZE;
121 break;
122 } else {
123 SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
124 "status 0x%x\n", __func__,
125 SAS_ADDR(dev->sas_addr),
126 task->task_status.resp,
127 task->task_status.stat);
128 sas_free_task(task);
129 task = NULL;
130 }
131 }
132 ex_err:
133 BUG_ON(retry == 3 && task != NULL);
134 if (task != NULL) {
135 sas_free_task(task);
136 }
137 return res;
138 }
139
140 /* ---------- Allocations ---------- */
141
142 static inline void *alloc_smp_req(int size)
143 {
144 u8 *p = kzalloc(size, GFP_KERNEL);
145 if (p)
146 p[0] = SMP_REQUEST;
147 return p;
148 }
149
150 static inline void *alloc_smp_resp(int size)
151 {
152 return kzalloc(size, GFP_KERNEL);
153 }
154
155 /* ---------- Expander configuration ---------- */
156
157 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
158 void *disc_resp)
159 {
160 struct expander_device *ex = &dev->ex_dev;
161 struct ex_phy *phy = &ex->ex_phy[phy_id];
162 struct smp_resp *resp = disc_resp;
163 struct discover_resp *dr = &resp->disc;
164 struct sas_rphy *rphy = dev->rphy;
165 int rediscover = (phy->phy != NULL);
166
167 if (!rediscover) {
168 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
169
170 /* FIXME: error_handling */
171 BUG_ON(!phy->phy);
172 }
173
174 switch (resp->result) {
175 case SMP_RESP_PHY_VACANT:
176 phy->phy_state = PHY_VACANT;
177 return;
178 default:
179 phy->phy_state = PHY_NOT_PRESENT;
180 return;
181 case SMP_RESP_FUNC_ACC:
182 phy->phy_state = PHY_EMPTY; /* do not know yet */
183 break;
184 }
185
186 phy->phy_id = phy_id;
187 phy->attached_dev_type = dr->attached_dev_type;
188 phy->linkrate = dr->linkrate;
189 phy->attached_sata_host = dr->attached_sata_host;
190 phy->attached_sata_dev = dr->attached_sata_dev;
191 phy->attached_sata_ps = dr->attached_sata_ps;
192 phy->attached_iproto = dr->iproto << 1;
193 phy->attached_tproto = dr->tproto << 1;
194 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
195 phy->attached_phy_id = dr->attached_phy_id;
196 phy->phy_change_count = dr->change_count;
197 phy->routing_attr = dr->routing_attr;
198 phy->virtual = dr->virtual;
199 phy->last_da_index = -1;
200
201 phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
202 phy->phy->identify.target_port_protocols = phy->attached_tproto;
203 phy->phy->identify.phy_identifier = phy_id;
204 phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
205 phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
206 phy->phy->minimum_linkrate = dr->pmin_linkrate;
207 phy->phy->maximum_linkrate = dr->pmax_linkrate;
208 phy->phy->negotiated_linkrate = phy->linkrate;
209
210 if (!rediscover)
211 sas_phy_add(phy->phy);
212
213 SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
214 SAS_ADDR(dev->sas_addr), phy->phy_id,
215 phy->routing_attr == TABLE_ROUTING ? 'T' :
216 phy->routing_attr == DIRECT_ROUTING ? 'D' :
217 phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
218 SAS_ADDR(phy->attached_sas_addr));
219
220 return;
221 }
222
223 #define DISCOVER_REQ_SIZE 16
224 #define DISCOVER_RESP_SIZE 56
225
226 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
227 u8 *disc_resp, int single)
228 {
229 int i, res;
230
231 disc_req[9] = single;
232 for (i = 1 ; i < 3; i++) {
233 struct discover_resp *dr;
234
235 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
236 disc_resp, DISCOVER_RESP_SIZE);
237 if (res)
238 return res;
239 /* This is detecting a failure to transmit inital
240 * dev to host FIS as described in section G.5 of
241 * sas-2 r 04b */
242 dr = &((struct smp_resp *)disc_resp)->disc;
243 if (!(dr->attached_dev_type == 0 &&
244 dr->attached_sata_dev))
245 break;
246 /* In order to generate the dev to host FIS, we
247 * send a link reset to the expander port */
248 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
249 /* Wait for the reset to trigger the negotiation */
250 msleep(500);
251 }
252 sas_set_ex_phy(dev, single, disc_resp);
253 return 0;
254 }
255
256 static int sas_ex_phy_discover(struct domain_device *dev, int single)
257 {
258 struct expander_device *ex = &dev->ex_dev;
259 int res = 0;
260 u8 *disc_req;
261 u8 *disc_resp;
262
263 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
264 if (!disc_req)
265 return -ENOMEM;
266
267 disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
268 if (!disc_resp) {
269 kfree(disc_req);
270 return -ENOMEM;
271 }
272
273 disc_req[1] = SMP_DISCOVER;
274
275 if (0 <= single && single < ex->num_phys) {
276 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
277 } else {
278 int i;
279
280 for (i = 0; i < ex->num_phys; i++) {
281 res = sas_ex_phy_discover_helper(dev, disc_req,
282 disc_resp, i);
283 if (res)
284 goto out_err;
285 }
286 }
287 out_err:
288 kfree(disc_resp);
289 kfree(disc_req);
290 return res;
291 }
292
293 static int sas_expander_discover(struct domain_device *dev)
294 {
295 struct expander_device *ex = &dev->ex_dev;
296 int res = -ENOMEM;
297
298 ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
299 if (!ex->ex_phy)
300 return -ENOMEM;
301
302 res = sas_ex_phy_discover(dev, -1);
303 if (res)
304 goto out_err;
305
306 return 0;
307 out_err:
308 kfree(ex->ex_phy);
309 ex->ex_phy = NULL;
310 return res;
311 }
312
313 #define MAX_EXPANDER_PHYS 128
314
315 static void ex_assign_report_general(struct domain_device *dev,
316 struct smp_resp *resp)
317 {
318 struct report_general_resp *rg = &resp->rg;
319
320 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
321 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
322 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
323 dev->ex_dev.conf_route_table = rg->conf_route_table;
324 dev->ex_dev.configuring = rg->configuring;
325 memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
326 }
327
328 #define RG_REQ_SIZE 8
329 #define RG_RESP_SIZE 32
330
331 static int sas_ex_general(struct domain_device *dev)
332 {
333 u8 *rg_req;
334 struct smp_resp *rg_resp;
335 int res;
336 int i;
337
338 rg_req = alloc_smp_req(RG_REQ_SIZE);
339 if (!rg_req)
340 return -ENOMEM;
341
342 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
343 if (!rg_resp) {
344 kfree(rg_req);
345 return -ENOMEM;
346 }
347
348 rg_req[1] = SMP_REPORT_GENERAL;
349
350 for (i = 0; i < 5; i++) {
351 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
352 RG_RESP_SIZE);
353
354 if (res) {
355 SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
356 SAS_ADDR(dev->sas_addr), res);
357 goto out;
358 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
359 SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
360 SAS_ADDR(dev->sas_addr), rg_resp->result);
361 res = rg_resp->result;
362 goto out;
363 }
364
365 ex_assign_report_general(dev, rg_resp);
366
367 if (dev->ex_dev.configuring) {
368 SAS_DPRINTK("RG: ex %llx self-configuring...\n",
369 SAS_ADDR(dev->sas_addr));
370 schedule_timeout_interruptible(5*HZ);
371 } else
372 break;
373 }
374 out:
375 kfree(rg_req);
376 kfree(rg_resp);
377 return res;
378 }
379
380 static void ex_assign_manuf_info(struct domain_device *dev, void
381 *_mi_resp)
382 {
383 u8 *mi_resp = _mi_resp;
384 struct sas_rphy *rphy = dev->rphy;
385 struct sas_expander_device *edev = rphy_to_expander_device(rphy);
386
387 memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
388 memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
389 memcpy(edev->product_rev, mi_resp + 36,
390 SAS_EXPANDER_PRODUCT_REV_LEN);
391
392 if (mi_resp[8] & 1) {
393 memcpy(edev->component_vendor_id, mi_resp + 40,
394 SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
395 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
396 edev->component_revision_id = mi_resp[50];
397 }
398 }
399
400 #define MI_REQ_SIZE 8
401 #define MI_RESP_SIZE 64
402
403 static int sas_ex_manuf_info(struct domain_device *dev)
404 {
405 u8 *mi_req;
406 u8 *mi_resp;
407 int res;
408
409 mi_req = alloc_smp_req(MI_REQ_SIZE);
410 if (!mi_req)
411 return -ENOMEM;
412
413 mi_resp = alloc_smp_resp(MI_RESP_SIZE);
414 if (!mi_resp) {
415 kfree(mi_req);
416 return -ENOMEM;
417 }
418
419 mi_req[1] = SMP_REPORT_MANUF_INFO;
420
421 res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
422 if (res) {
423 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
424 SAS_ADDR(dev->sas_addr), res);
425 goto out;
426 } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
427 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
428 SAS_ADDR(dev->sas_addr), mi_resp[2]);
429 goto out;
430 }
431
432 ex_assign_manuf_info(dev, mi_resp);
433 out:
434 kfree(mi_req);
435 kfree(mi_resp);
436 return res;
437 }
438
439 #define PC_REQ_SIZE 44
440 #define PC_RESP_SIZE 8
441
442 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
443 enum phy_func phy_func,
444 struct sas_phy_linkrates *rates)
445 {
446 u8 *pc_req;
447 u8 *pc_resp;
448 int res;
449
450 pc_req = alloc_smp_req(PC_REQ_SIZE);
451 if (!pc_req)
452 return -ENOMEM;
453
454 pc_resp = alloc_smp_resp(PC_RESP_SIZE);
455 if (!pc_resp) {
456 kfree(pc_req);
457 return -ENOMEM;
458 }
459
460 pc_req[1] = SMP_PHY_CONTROL;
461 pc_req[9] = phy_id;
462 pc_req[10]= phy_func;
463 if (rates) {
464 pc_req[32] = rates->minimum_linkrate << 4;
465 pc_req[33] = rates->maximum_linkrate << 4;
466 }
467
468 res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
469
470 kfree(pc_resp);
471 kfree(pc_req);
472 return res;
473 }
474
475 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
476 {
477 struct expander_device *ex = &dev->ex_dev;
478 struct ex_phy *phy = &ex->ex_phy[phy_id];
479
480 sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
481 phy->linkrate = SAS_PHY_DISABLED;
482 }
483
484 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
485 {
486 struct expander_device *ex = &dev->ex_dev;
487 int i;
488
489 for (i = 0; i < ex->num_phys; i++) {
490 struct ex_phy *phy = &ex->ex_phy[i];
491
492 if (phy->phy_state == PHY_VACANT ||
493 phy->phy_state == PHY_NOT_PRESENT)
494 continue;
495
496 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
497 sas_ex_disable_phy(dev, i);
498 }
499 }
500
501 static int sas_dev_present_in_domain(struct asd_sas_port *port,
502 u8 *sas_addr)
503 {
504 struct domain_device *dev;
505
506 if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
507 return 1;
508 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
509 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
510 return 1;
511 }
512 return 0;
513 }
514
515 #define RPEL_REQ_SIZE 16
516 #define RPEL_RESP_SIZE 32
517 int sas_smp_get_phy_events(struct sas_phy *phy)
518 {
519 int res;
520 u8 *req;
521 u8 *resp;
522 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
523 struct domain_device *dev = sas_find_dev_by_rphy(rphy);
524
525 req = alloc_smp_req(RPEL_REQ_SIZE);
526 if (!req)
527 return -ENOMEM;
528
529 resp = alloc_smp_resp(RPEL_RESP_SIZE);
530 if (!resp) {
531 kfree(req);
532 return -ENOMEM;
533 }
534
535 req[1] = SMP_REPORT_PHY_ERR_LOG;
536 req[9] = phy->number;
537
538 res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
539 resp, RPEL_RESP_SIZE);
540
541 if (!res)
542 goto out;
543
544 phy->invalid_dword_count = scsi_to_u32(&resp[12]);
545 phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
546 phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
547 phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
548
549 out:
550 kfree(resp);
551 return res;
552
553 }
554
555 #ifdef CONFIG_SCSI_SAS_ATA
556
557 #define RPS_REQ_SIZE 16
558 #define RPS_RESP_SIZE 60
559
560 static int sas_get_report_phy_sata(struct domain_device *dev,
561 int phy_id,
562 struct smp_resp *rps_resp)
563 {
564 int res;
565 u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
566 u8 *resp = (u8 *)rps_resp;
567
568 if (!rps_req)
569 return -ENOMEM;
570
571 rps_req[1] = SMP_REPORT_PHY_SATA;
572 rps_req[9] = phy_id;
573
574 res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
575 rps_resp, RPS_RESP_SIZE);
576
577 /* 0x34 is the FIS type for the D2H fis. There's a potential
578 * standards cockup here. sas-2 explicitly specifies the FIS
579 * should be encoded so that FIS type is in resp[24].
580 * However, some expanders endian reverse this. Undo the
581 * reversal here */
582 if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
583 int i;
584
585 for (i = 0; i < 5; i++) {
586 int j = 24 + (i*4);
587 u8 a, b;
588 a = resp[j + 0];
589 b = resp[j + 1];
590 resp[j + 0] = resp[j + 3];
591 resp[j + 1] = resp[j + 2];
592 resp[j + 2] = b;
593 resp[j + 3] = a;
594 }
595 }
596
597 kfree(rps_req);
598 return res;
599 }
600 #endif
601
602 static void sas_ex_get_linkrate(struct domain_device *parent,
603 struct domain_device *child,
604 struct ex_phy *parent_phy)
605 {
606 struct expander_device *parent_ex = &parent->ex_dev;
607 struct sas_port *port;
608 int i;
609
610 child->pathways = 0;
611
612 port = parent_phy->port;
613
614 for (i = 0; i < parent_ex->num_phys; i++) {
615 struct ex_phy *phy = &parent_ex->ex_phy[i];
616
617 if (phy->phy_state == PHY_VACANT ||
618 phy->phy_state == PHY_NOT_PRESENT)
619 continue;
620
621 if (SAS_ADDR(phy->attached_sas_addr) ==
622 SAS_ADDR(child->sas_addr)) {
623
624 child->min_linkrate = min(parent->min_linkrate,
625 phy->linkrate);
626 child->max_linkrate = max(parent->max_linkrate,
627 phy->linkrate);
628 child->pathways++;
629 sas_port_add_phy(port, phy->phy);
630 }
631 }
632 child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
633 child->pathways = min(child->pathways, parent->pathways);
634 }
635
636 static struct domain_device *sas_ex_discover_end_dev(
637 struct domain_device *parent, int phy_id)
638 {
639 struct expander_device *parent_ex = &parent->ex_dev;
640 struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
641 struct domain_device *child = NULL;
642 struct sas_rphy *rphy;
643 int res;
644
645 if (phy->attached_sata_host || phy->attached_sata_ps)
646 return NULL;
647
648 child = kzalloc(sizeof(*child), GFP_KERNEL);
649 if (!child)
650 return NULL;
651
652 child->parent = parent;
653 child->port = parent->port;
654 child->iproto = phy->attached_iproto;
655 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
656 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
657 if (!phy->port) {
658 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
659 if (unlikely(!phy->port))
660 goto out_err;
661 if (unlikely(sas_port_add(phy->port) != 0)) {
662 sas_port_free(phy->port);
663 goto out_err;
664 }
665 }
666 sas_ex_get_linkrate(parent, child, phy);
667
668 #ifdef CONFIG_SCSI_SAS_ATA
669 if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
670 child->dev_type = SATA_DEV;
671 if (phy->attached_tproto & SAS_PROTOCOL_STP)
672 child->tproto = phy->attached_tproto;
673 if (phy->attached_sata_dev)
674 child->tproto |= SATA_DEV;
675 res = sas_get_report_phy_sata(parent, phy_id,
676 &child->sata_dev.rps_resp);
677 if (res) {
678 SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
679 "0x%x\n", SAS_ADDR(parent->sas_addr),
680 phy_id, res);
681 goto out_free;
682 }
683 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
684 sizeof(struct dev_to_host_fis));
685
686 rphy = sas_end_device_alloc(phy->port);
687 if (unlikely(!rphy))
688 goto out_free;
689
690 sas_init_dev(child);
691
692 child->rphy = rphy;
693
694 spin_lock_irq(&parent->port->dev_list_lock);
695 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
696 spin_unlock_irq(&parent->port->dev_list_lock);
697
698 res = sas_discover_sata(child);
699 if (res) {
700 SAS_DPRINTK("sas_discover_sata() for device %16llx at "
701 "%016llx:0x%x returned 0x%x\n",
702 SAS_ADDR(child->sas_addr),
703 SAS_ADDR(parent->sas_addr), phy_id, res);
704 goto out_list_del;
705 }
706 } else
707 #endif
708 if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
709 child->dev_type = SAS_END_DEV;
710 rphy = sas_end_device_alloc(phy->port);
711 /* FIXME: error handling */
712 if (unlikely(!rphy))
713 goto out_free;
714 child->tproto = phy->attached_tproto;
715 sas_init_dev(child);
716
717 child->rphy = rphy;
718 sas_fill_in_rphy(child, rphy);
719
720 spin_lock_irq(&parent->port->dev_list_lock);
721 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
722 spin_unlock_irq(&parent->port->dev_list_lock);
723
724 res = sas_discover_end_dev(child);
725 if (res) {
726 SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
727 "at %016llx:0x%x returned 0x%x\n",
728 SAS_ADDR(child->sas_addr),
729 SAS_ADDR(parent->sas_addr), phy_id, res);
730 goto out_list_del;
731 }
732 } else {
733 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
734 phy->attached_tproto, SAS_ADDR(parent->sas_addr),
735 phy_id);
736 goto out_free;
737 }
738
739 list_add_tail(&child->siblings, &parent_ex->children);
740 return child;
741
742 out_list_del:
743 sas_rphy_free(child->rphy);
744 child->rphy = NULL;
745 list_del(&child->dev_list_node);
746 out_free:
747 sas_port_delete(phy->port);
748 out_err:
749 phy->port = NULL;
750 kfree(child);
751 return NULL;
752 }
753
754 /* See if this phy is part of a wide port */
755 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
756 {
757 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
758 int i;
759
760 for (i = 0; i < parent->ex_dev.num_phys; i++) {
761 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
762
763 if (ephy == phy)
764 continue;
765
766 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
767 SAS_ADDR_SIZE) && ephy->port) {
768 sas_port_add_phy(ephy->port, phy->phy);
769 phy->port = ephy->port;
770 phy->phy_state = PHY_DEVICE_DISCOVERED;
771 return 0;
772 }
773 }
774
775 return -ENODEV;
776 }
777
778 static struct domain_device *sas_ex_discover_expander(
779 struct domain_device *parent, int phy_id)
780 {
781 struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
782 struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
783 struct domain_device *child = NULL;
784 struct sas_rphy *rphy;
785 struct sas_expander_device *edev;
786 struct asd_sas_port *port;
787 int res;
788
789 if (phy->routing_attr == DIRECT_ROUTING) {
790 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
791 "allowed\n",
792 SAS_ADDR(parent->sas_addr), phy_id,
793 SAS_ADDR(phy->attached_sas_addr),
794 phy->attached_phy_id);
795 return NULL;
796 }
797 child = kzalloc(sizeof(*child), GFP_KERNEL);
798 if (!child)
799 return NULL;
800
801 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
802 /* FIXME: better error handling */
803 BUG_ON(sas_port_add(phy->port) != 0);
804
805
806 switch (phy->attached_dev_type) {
807 case EDGE_DEV:
808 rphy = sas_expander_alloc(phy->port,
809 SAS_EDGE_EXPANDER_DEVICE);
810 break;
811 case FANOUT_DEV:
812 rphy = sas_expander_alloc(phy->port,
813 SAS_FANOUT_EXPANDER_DEVICE);
814 break;
815 default:
816 rphy = NULL; /* shut gcc up */
817 BUG();
818 }
819 port = parent->port;
820 child->rphy = rphy;
821 edev = rphy_to_expander_device(rphy);
822 child->dev_type = phy->attached_dev_type;
823 child->parent = parent;
824 child->port = port;
825 child->iproto = phy->attached_iproto;
826 child->tproto = phy->attached_tproto;
827 memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
828 sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
829 sas_ex_get_linkrate(parent, child, phy);
830 edev->level = parent_ex->level + 1;
831 parent->port->disc.max_level = max(parent->port->disc.max_level,
832 edev->level);
833 sas_init_dev(child);
834 sas_fill_in_rphy(child, rphy);
835 sas_rphy_add(rphy);
836
837 spin_lock_irq(&parent->port->dev_list_lock);
838 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
839 spin_unlock_irq(&parent->port->dev_list_lock);
840
841 res = sas_discover_expander(child);
842 if (res) {
843 kfree(child);
844 return NULL;
845 }
846 list_add_tail(&child->siblings, &parent->ex_dev.children);
847 return child;
848 }
849
850 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
851 {
852 struct expander_device *ex = &dev->ex_dev;
853 struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
854 struct domain_device *child = NULL;
855 int res = 0;
856
857 /* Phy state */
858 if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
859 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
860 res = sas_ex_phy_discover(dev, phy_id);
861 if (res)
862 return res;
863 }
864
865 /* Parent and domain coherency */
866 if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
867 SAS_ADDR(dev->port->sas_addr))) {
868 sas_add_parent_port(dev, phy_id);
869 return 0;
870 }
871 if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
872 SAS_ADDR(dev->parent->sas_addr))) {
873 sas_add_parent_port(dev, phy_id);
874 if (ex_phy->routing_attr == TABLE_ROUTING)
875 sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
876 return 0;
877 }
878
879 if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
880 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
881
882 if (ex_phy->attached_dev_type == NO_DEVICE) {
883 if (ex_phy->routing_attr == DIRECT_ROUTING) {
884 memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
885 sas_configure_routing(dev, ex_phy->attached_sas_addr);
886 }
887 return 0;
888 } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
889 return 0;
890
891 if (ex_phy->attached_dev_type != SAS_END_DEV &&
892 ex_phy->attached_dev_type != FANOUT_DEV &&
893 ex_phy->attached_dev_type != EDGE_DEV) {
894 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
895 "phy 0x%x\n", ex_phy->attached_dev_type,
896 SAS_ADDR(dev->sas_addr),
897 phy_id);
898 return 0;
899 }
900
901 res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
902 if (res) {
903 SAS_DPRINTK("configure routing for dev %016llx "
904 "reported 0x%x. Forgotten\n",
905 SAS_ADDR(ex_phy->attached_sas_addr), res);
906 sas_disable_routing(dev, ex_phy->attached_sas_addr);
907 return res;
908 }
909
910 res = sas_ex_join_wide_port(dev, phy_id);
911 if (!res) {
912 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
913 phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
914 return res;
915 }
916
917 switch (ex_phy->attached_dev_type) {
918 case SAS_END_DEV:
919 child = sas_ex_discover_end_dev(dev, phy_id);
920 break;
921 case FANOUT_DEV:
922 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
923 SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
924 "attached to ex %016llx phy 0x%x\n",
925 SAS_ADDR(ex_phy->attached_sas_addr),
926 ex_phy->attached_phy_id,
927 SAS_ADDR(dev->sas_addr),
928 phy_id);
929 sas_ex_disable_phy(dev, phy_id);
930 break;
931 } else
932 memcpy(dev->port->disc.fanout_sas_addr,
933 ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
934 /* fallthrough */
935 case EDGE_DEV:
936 child = sas_ex_discover_expander(dev, phy_id);
937 break;
938 default:
939 break;
940 }
941
942 if (child) {
943 int i;
944
945 for (i = 0; i < ex->num_phys; i++) {
946 if (ex->ex_phy[i].phy_state == PHY_VACANT ||
947 ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
948 continue;
949 /*
950 * Due to races, the phy might not get added to the
951 * wide port, so we add the phy to the wide port here.
952 */
953 if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
954 SAS_ADDR(child->sas_addr)) {
955 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
956 res = sas_ex_join_wide_port(dev, i);
957 if (!res)
958 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
959 i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
960
961 }
962 }
963 }
964
965 return res;
966 }
967
968 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
969 {
970 struct expander_device *ex = &dev->ex_dev;
971 int i;
972
973 for (i = 0; i < ex->num_phys; i++) {
974 struct ex_phy *phy = &ex->ex_phy[i];
975
976 if (phy->phy_state == PHY_VACANT ||
977 phy->phy_state == PHY_NOT_PRESENT)
978 continue;
979
980 if ((phy->attached_dev_type == EDGE_DEV ||
981 phy->attached_dev_type == FANOUT_DEV) &&
982 phy->routing_attr == SUBTRACTIVE_ROUTING) {
983
984 memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
985
986 return 1;
987 }
988 }
989 return 0;
990 }
991
992 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
993 {
994 struct expander_device *ex = &dev->ex_dev;
995 struct domain_device *child;
996 u8 sub_addr[8] = {0, };
997
998 list_for_each_entry(child, &ex->children, siblings) {
999 if (child->dev_type != EDGE_DEV &&
1000 child->dev_type != FANOUT_DEV)
1001 continue;
1002 if (sub_addr[0] == 0) {
1003 sas_find_sub_addr(child, sub_addr);
1004 continue;
1005 } else {
1006 u8 s2[8];
1007
1008 if (sas_find_sub_addr(child, s2) &&
1009 (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1010
1011 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1012 "diverges from subtractive "
1013 "boundary %016llx\n",
1014 SAS_ADDR(dev->sas_addr),
1015 SAS_ADDR(child->sas_addr),
1016 SAS_ADDR(s2),
1017 SAS_ADDR(sub_addr));
1018
1019 sas_ex_disable_port(child, s2);
1020 }
1021 }
1022 }
1023 return 0;
1024 }
1025 /**
1026 * sas_ex_discover_devices -- discover devices attached to this expander
1027 * dev: pointer to the expander domain device
1028 * single: if you want to do a single phy, else set to -1;
1029 *
1030 * Configure this expander for use with its devices and register the
1031 * devices of this expander.
1032 */
1033 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1034 {
1035 struct expander_device *ex = &dev->ex_dev;
1036 int i = 0, end = ex->num_phys;
1037 int res = 0;
1038
1039 if (0 <= single && single < end) {
1040 i = single;
1041 end = i+1;
1042 }
1043
1044 for ( ; i < end; i++) {
1045 struct ex_phy *ex_phy = &ex->ex_phy[i];
1046
1047 if (ex_phy->phy_state == PHY_VACANT ||
1048 ex_phy->phy_state == PHY_NOT_PRESENT ||
1049 ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1050 continue;
1051
1052 switch (ex_phy->linkrate) {
1053 case SAS_PHY_DISABLED:
1054 case SAS_PHY_RESET_PROBLEM:
1055 case SAS_SATA_PORT_SELECTOR:
1056 continue;
1057 default:
1058 res = sas_ex_discover_dev(dev, i);
1059 if (res)
1060 break;
1061 continue;
1062 }
1063 }
1064
1065 if (!res)
1066 sas_check_level_subtractive_boundary(dev);
1067
1068 return res;
1069 }
1070
1071 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1072 {
1073 struct expander_device *ex = &dev->ex_dev;
1074 int i;
1075 u8 *sub_sas_addr = NULL;
1076
1077 if (dev->dev_type != EDGE_DEV)
1078 return 0;
1079
1080 for (i = 0; i < ex->num_phys; i++) {
1081 struct ex_phy *phy = &ex->ex_phy[i];
1082
1083 if (phy->phy_state == PHY_VACANT ||
1084 phy->phy_state == PHY_NOT_PRESENT)
1085 continue;
1086
1087 if ((phy->attached_dev_type == FANOUT_DEV ||
1088 phy->attached_dev_type == EDGE_DEV) &&
1089 phy->routing_attr == SUBTRACTIVE_ROUTING) {
1090
1091 if (!sub_sas_addr)
1092 sub_sas_addr = &phy->attached_sas_addr[0];
1093 else if (SAS_ADDR(sub_sas_addr) !=
1094 SAS_ADDR(phy->attached_sas_addr)) {
1095
1096 SAS_DPRINTK("ex %016llx phy 0x%x "
1097 "diverges(%016llx) on subtractive "
1098 "boundary(%016llx). Disabled\n",
1099 SAS_ADDR(dev->sas_addr), i,
1100 SAS_ADDR(phy->attached_sas_addr),
1101 SAS_ADDR(sub_sas_addr));
1102 sas_ex_disable_phy(dev, i);
1103 }
1104 }
1105 }
1106 return 0;
1107 }
1108
1109 static void sas_print_parent_topology_bug(struct domain_device *child,
1110 struct ex_phy *parent_phy,
1111 struct ex_phy *child_phy)
1112 {
1113 static const char ra_char[] = {
1114 [DIRECT_ROUTING] = 'D',
1115 [SUBTRACTIVE_ROUTING] = 'S',
1116 [TABLE_ROUTING] = 'T',
1117 };
1118 static const char *ex_type[] = {
1119 [EDGE_DEV] = "edge",
1120 [FANOUT_DEV] = "fanout",
1121 };
1122 struct domain_device *parent = child->parent;
1123
1124 sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1125 "has %c:%c routing link!\n",
1126
1127 ex_type[parent->dev_type],
1128 SAS_ADDR(parent->sas_addr),
1129 parent_phy->phy_id,
1130
1131 ex_type[child->dev_type],
1132 SAS_ADDR(child->sas_addr),
1133 child_phy->phy_id,
1134
1135 ra_char[parent_phy->routing_attr],
1136 ra_char[child_phy->routing_attr]);
1137 }
1138
1139 static int sas_check_eeds(struct domain_device *child,
1140 struct ex_phy *parent_phy,
1141 struct ex_phy *child_phy)
1142 {
1143 int res = 0;
1144 struct domain_device *parent = child->parent;
1145
1146 if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1147 res = -ENODEV;
1148 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1149 "phy S:0x%x, while there is a fanout ex %016llx\n",
1150 SAS_ADDR(parent->sas_addr),
1151 parent_phy->phy_id,
1152 SAS_ADDR(child->sas_addr),
1153 child_phy->phy_id,
1154 SAS_ADDR(parent->port->disc.fanout_sas_addr));
1155 } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1156 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1157 SAS_ADDR_SIZE);
1158 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1159 SAS_ADDR_SIZE);
1160 } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1161 SAS_ADDR(parent->sas_addr)) ||
1162 (SAS_ADDR(parent->port->disc.eeds_a) ==
1163 SAS_ADDR(child->sas_addr)))
1164 &&
1165 ((SAS_ADDR(parent->port->disc.eeds_b) ==
1166 SAS_ADDR(parent->sas_addr)) ||
1167 (SAS_ADDR(parent->port->disc.eeds_b) ==
1168 SAS_ADDR(child->sas_addr))))
1169 ;
1170 else {
1171 res = -ENODEV;
1172 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1173 "phy 0x%x link forms a third EEDS!\n",
1174 SAS_ADDR(parent->sas_addr),
1175 parent_phy->phy_id,
1176 SAS_ADDR(child->sas_addr),
1177 child_phy->phy_id);
1178 }
1179
1180 return res;
1181 }
1182
1183 /* Here we spill over 80 columns. It is intentional.
1184 */
1185 static int sas_check_parent_topology(struct domain_device *child)
1186 {
1187 struct expander_device *child_ex = &child->ex_dev;
1188 struct expander_device *parent_ex;
1189 int i;
1190 int res = 0;
1191
1192 if (!child->parent)
1193 return 0;
1194
1195 if (child->parent->dev_type != EDGE_DEV &&
1196 child->parent->dev_type != FANOUT_DEV)
1197 return 0;
1198
1199 parent_ex = &child->parent->ex_dev;
1200
1201 for (i = 0; i < parent_ex->num_phys; i++) {
1202 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1203 struct ex_phy *child_phy;
1204
1205 if (parent_phy->phy_state == PHY_VACANT ||
1206 parent_phy->phy_state == PHY_NOT_PRESENT)
1207 continue;
1208
1209 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1210 continue;
1211
1212 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1213
1214 switch (child->parent->dev_type) {
1215 case EDGE_DEV:
1216 if (child->dev_type == FANOUT_DEV) {
1217 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1218 child_phy->routing_attr != TABLE_ROUTING) {
1219 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1220 res = -ENODEV;
1221 }
1222 } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1223 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1224 res = sas_check_eeds(child, parent_phy, child_phy);
1225 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1226 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1227 res = -ENODEV;
1228 }
1229 } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1230 child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1231 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1232 res = -ENODEV;
1233 }
1234 break;
1235 case FANOUT_DEV:
1236 if (parent_phy->routing_attr != TABLE_ROUTING ||
1237 child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1238 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1239 res = -ENODEV;
1240 }
1241 break;
1242 default:
1243 break;
1244 }
1245 }
1246
1247 return res;
1248 }
1249
1250 #define RRI_REQ_SIZE 16
1251 #define RRI_RESP_SIZE 44
1252
1253 static int sas_configure_present(struct domain_device *dev, int phy_id,
1254 u8 *sas_addr, int *index, int *present)
1255 {
1256 int i, res = 0;
1257 struct expander_device *ex = &dev->ex_dev;
1258 struct ex_phy *phy = &ex->ex_phy[phy_id];
1259 u8 *rri_req;
1260 u8 *rri_resp;
1261
1262 *present = 0;
1263 *index = 0;
1264
1265 rri_req = alloc_smp_req(RRI_REQ_SIZE);
1266 if (!rri_req)
1267 return -ENOMEM;
1268
1269 rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1270 if (!rri_resp) {
1271 kfree(rri_req);
1272 return -ENOMEM;
1273 }
1274
1275 rri_req[1] = SMP_REPORT_ROUTE_INFO;
1276 rri_req[9] = phy_id;
1277
1278 for (i = 0; i < ex->max_route_indexes ; i++) {
1279 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1280 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1281 RRI_RESP_SIZE);
1282 if (res)
1283 goto out;
1284 res = rri_resp[2];
1285 if (res == SMP_RESP_NO_INDEX) {
1286 SAS_DPRINTK("overflow of indexes: dev %016llx "
1287 "phy 0x%x index 0x%x\n",
1288 SAS_ADDR(dev->sas_addr), phy_id, i);
1289 goto out;
1290 } else if (res != SMP_RESP_FUNC_ACC) {
1291 SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1292 "result 0x%x\n", __func__,
1293 SAS_ADDR(dev->sas_addr), phy_id, i, res);
1294 goto out;
1295 }
1296 if (SAS_ADDR(sas_addr) != 0) {
1297 if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1298 *index = i;
1299 if ((rri_resp[12] & 0x80) == 0x80)
1300 *present = 0;
1301 else
1302 *present = 1;
1303 goto out;
1304 } else if (SAS_ADDR(rri_resp+16) == 0) {
1305 *index = i;
1306 *present = 0;
1307 goto out;
1308 }
1309 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1310 phy->last_da_index < i) {
1311 phy->last_da_index = i;
1312 *index = i;
1313 *present = 0;
1314 goto out;
1315 }
1316 }
1317 res = -1;
1318 out:
1319 kfree(rri_req);
1320 kfree(rri_resp);
1321 return res;
1322 }
1323
1324 #define CRI_REQ_SIZE 44
1325 #define CRI_RESP_SIZE 8
1326
1327 static int sas_configure_set(struct domain_device *dev, int phy_id,
1328 u8 *sas_addr, int index, int include)
1329 {
1330 int res;
1331 u8 *cri_req;
1332 u8 *cri_resp;
1333
1334 cri_req = alloc_smp_req(CRI_REQ_SIZE);
1335 if (!cri_req)
1336 return -ENOMEM;
1337
1338 cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1339 if (!cri_resp) {
1340 kfree(cri_req);
1341 return -ENOMEM;
1342 }
1343
1344 cri_req[1] = SMP_CONF_ROUTE_INFO;
1345 *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1346 cri_req[9] = phy_id;
1347 if (SAS_ADDR(sas_addr) == 0 || !include)
1348 cri_req[12] |= 0x80;
1349 memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1350
1351 res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1352 CRI_RESP_SIZE);
1353 if (res)
1354 goto out;
1355 res = cri_resp[2];
1356 if (res == SMP_RESP_NO_INDEX) {
1357 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1358 "index 0x%x\n",
1359 SAS_ADDR(dev->sas_addr), phy_id, index);
1360 }
1361 out:
1362 kfree(cri_req);
1363 kfree(cri_resp);
1364 return res;
1365 }
1366
1367 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1368 u8 *sas_addr, int include)
1369 {
1370 int index;
1371 int present;
1372 int res;
1373
1374 res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1375 if (res)
1376 return res;
1377 if (include ^ present)
1378 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1379
1380 return res;
1381 }
1382
1383 /**
1384 * sas_configure_parent -- configure routing table of parent
1385 * parent: parent expander
1386 * child: child expander
1387 * sas_addr: SAS port identifier of device directly attached to child
1388 */
1389 static int sas_configure_parent(struct domain_device *parent,
1390 struct domain_device *child,
1391 u8 *sas_addr, int include)
1392 {
1393 struct expander_device *ex_parent = &parent->ex_dev;
1394 int res = 0;
1395 int i;
1396
1397 if (parent->parent) {
1398 res = sas_configure_parent(parent->parent, parent, sas_addr,
1399 include);
1400 if (res)
1401 return res;
1402 }
1403
1404 if (ex_parent->conf_route_table == 0) {
1405 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1406 SAS_ADDR(parent->sas_addr));
1407 return 0;
1408 }
1409
1410 for (i = 0; i < ex_parent->num_phys; i++) {
1411 struct ex_phy *phy = &ex_parent->ex_phy[i];
1412
1413 if ((phy->routing_attr == TABLE_ROUTING) &&
1414 (SAS_ADDR(phy->attached_sas_addr) ==
1415 SAS_ADDR(child->sas_addr))) {
1416 res = sas_configure_phy(parent, i, sas_addr, include);
1417 if (res)
1418 return res;
1419 }
1420 }
1421
1422 return res;
1423 }
1424
1425 /**
1426 * sas_configure_routing -- configure routing
1427 * dev: expander device
1428 * sas_addr: port identifier of device directly attached to the expander device
1429 */
1430 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1431 {
1432 if (dev->parent)
1433 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1434 return 0;
1435 }
1436
1437 static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr)
1438 {
1439 if (dev->parent)
1440 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1441 return 0;
1442 }
1443
1444 /**
1445 * sas_discover_expander -- expander discovery
1446 * @ex: pointer to expander domain device
1447 *
1448 * See comment in sas_discover_sata().
1449 */
1450 static int sas_discover_expander(struct domain_device *dev)
1451 {
1452 int res;
1453
1454 res = sas_notify_lldd_dev_found(dev);
1455 if (res)
1456 return res;
1457
1458 res = sas_ex_general(dev);
1459 if (res)
1460 goto out_err;
1461 res = sas_ex_manuf_info(dev);
1462 if (res)
1463 goto out_err;
1464
1465 res = sas_expander_discover(dev);
1466 if (res) {
1467 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1468 SAS_ADDR(dev->sas_addr), res);
1469 goto out_err;
1470 }
1471
1472 sas_check_ex_subtractive_boundary(dev);
1473 res = sas_check_parent_topology(dev);
1474 if (res)
1475 goto out_err;
1476 return 0;
1477 out_err:
1478 sas_notify_lldd_dev_gone(dev);
1479 return res;
1480 }
1481
1482 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1483 {
1484 int res = 0;
1485 struct domain_device *dev;
1486
1487 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1488 if (dev->dev_type == EDGE_DEV ||
1489 dev->dev_type == FANOUT_DEV) {
1490 struct sas_expander_device *ex =
1491 rphy_to_expander_device(dev->rphy);
1492
1493 if (level == ex->level)
1494 res = sas_ex_discover_devices(dev, -1);
1495 else if (level > 0)
1496 res = sas_ex_discover_devices(port->port_dev, -1);
1497
1498 }
1499 }
1500
1501 return res;
1502 }
1503
1504 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1505 {
1506 int res;
1507 int level;
1508
1509 do {
1510 level = port->disc.max_level;
1511 res = sas_ex_level_discovery(port, level);
1512 mb();
1513 } while (level < port->disc.max_level);
1514
1515 return res;
1516 }
1517
1518 int sas_discover_root_expander(struct domain_device *dev)
1519 {
1520 int res;
1521 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1522
1523 res = sas_rphy_add(dev->rphy);
1524 if (res)
1525 goto out_err;
1526
1527 ex->level = dev->port->disc.max_level; /* 0 */
1528 res = sas_discover_expander(dev);
1529 if (res)
1530 goto out_err2;
1531
1532 sas_ex_bfs_disc(dev->port);
1533
1534 return res;
1535
1536 out_err2:
1537 sas_rphy_remove(dev->rphy);
1538 out_err:
1539 return res;
1540 }
1541
1542 /* ---------- Domain revalidation ---------- */
1543
1544 static int sas_get_phy_discover(struct domain_device *dev,
1545 int phy_id, struct smp_resp *disc_resp)
1546 {
1547 int res;
1548 u8 *disc_req;
1549
1550 disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1551 if (!disc_req)
1552 return -ENOMEM;
1553
1554 disc_req[1] = SMP_DISCOVER;
1555 disc_req[9] = phy_id;
1556
1557 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1558 disc_resp, DISCOVER_RESP_SIZE);
1559 if (res)
1560 goto out;
1561 else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1562 res = disc_resp->result;
1563 goto out;
1564 }
1565 out:
1566 kfree(disc_req);
1567 return res;
1568 }
1569
1570 static int sas_get_phy_change_count(struct domain_device *dev,
1571 int phy_id, int *pcc)
1572 {
1573 int res;
1574 struct smp_resp *disc_resp;
1575
1576 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1577 if (!disc_resp)
1578 return -ENOMEM;
1579
1580 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1581 if (!res)
1582 *pcc = disc_resp->disc.change_count;
1583
1584 kfree(disc_resp);
1585 return res;
1586 }
1587
1588 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1589 int phy_id, u8 *attached_sas_addr)
1590 {
1591 int res;
1592 struct smp_resp *disc_resp;
1593 struct discover_resp *dr;
1594
1595 disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1596 if (!disc_resp)
1597 return -ENOMEM;
1598 dr = &disc_resp->disc;
1599
1600 res = sas_get_phy_discover(dev, phy_id, disc_resp);
1601 if (!res) {
1602 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1603 if (dr->attached_dev_type == 0)
1604 memset(attached_sas_addr, 0, 8);
1605 }
1606 kfree(disc_resp);
1607 return res;
1608 }
1609
1610 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1611 int from_phy, bool update)
1612 {
1613 struct expander_device *ex = &dev->ex_dev;
1614 int res = 0;
1615 int i;
1616
1617 for (i = from_phy; i < ex->num_phys; i++) {
1618 int phy_change_count = 0;
1619
1620 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1621 if (res)
1622 goto out;
1623 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1624 if (update)
1625 ex->ex_phy[i].phy_change_count =
1626 phy_change_count;
1627 *phy_id = i;
1628 return 0;
1629 }
1630 }
1631 out:
1632 return res;
1633 }
1634
1635 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1636 {
1637 int res;
1638 u8 *rg_req;
1639 struct smp_resp *rg_resp;
1640
1641 rg_req = alloc_smp_req(RG_REQ_SIZE);
1642 if (!rg_req)
1643 return -ENOMEM;
1644
1645 rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1646 if (!rg_resp) {
1647 kfree(rg_req);
1648 return -ENOMEM;
1649 }
1650
1651 rg_req[1] = SMP_REPORT_GENERAL;
1652
1653 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1654 RG_RESP_SIZE);
1655 if (res)
1656 goto out;
1657 if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1658 res = rg_resp->result;
1659 goto out;
1660 }
1661
1662 *ecc = be16_to_cpu(rg_resp->rg.change_count);
1663 out:
1664 kfree(rg_resp);
1665 kfree(rg_req);
1666 return res;
1667 }
1668 /**
1669 * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE).
1670 * @dev:domain device to be detect.
1671 * @src_dev: the device which originated BROADCAST(CHANGE).
1672 *
1673 * Add self-configuration expander suport. Suppose two expander cascading,
1674 * when the first level expander is self-configuring, hotplug the disks in
1675 * second level expander, BROADCAST(CHANGE) will not only be originated
1676 * in the second level expander, but also be originated in the first level
1677 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1678 * expander changed count in two level expanders will all increment at least
1679 * once, but the phy which chang count has changed is the source device which
1680 * we concerned.
1681 */
1682
1683 static int sas_find_bcast_dev(struct domain_device *dev,
1684 struct domain_device **src_dev)
1685 {
1686 struct expander_device *ex = &dev->ex_dev;
1687 int ex_change_count = -1;
1688 int phy_id = -1;
1689 int res;
1690 struct domain_device *ch;
1691
1692 res = sas_get_ex_change_count(dev, &ex_change_count);
1693 if (res)
1694 goto out;
1695 if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1696 /* Just detect if this expander phys phy change count changed,
1697 * in order to determine if this expander originate BROADCAST,
1698 * and do not update phy change count field in our structure.
1699 */
1700 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1701 if (phy_id != -1) {
1702 *src_dev = dev;
1703 ex->ex_change_count = ex_change_count;
1704 SAS_DPRINTK("Expander phy change count has changed\n");
1705 return res;
1706 } else
1707 SAS_DPRINTK("Expander phys DID NOT change\n");
1708 }
1709 list_for_each_entry(ch, &ex->children, siblings) {
1710 if (ch->dev_type == EDGE_DEV || ch->dev_type == FANOUT_DEV) {
1711 res = sas_find_bcast_dev(ch, src_dev);
1712 if (src_dev)
1713 return res;
1714 }
1715 }
1716 out:
1717 return res;
1718 }
1719
1720 static void sas_unregister_ex_tree(struct domain_device *dev)
1721 {
1722 struct expander_device *ex = &dev->ex_dev;
1723 struct domain_device *child, *n;
1724
1725 list_for_each_entry_safe(child, n, &ex->children, siblings) {
1726 if (child->dev_type == EDGE_DEV ||
1727 child->dev_type == FANOUT_DEV)
1728 sas_unregister_ex_tree(child);
1729 else
1730 sas_unregister_dev(child);
1731 }
1732 sas_unregister_dev(dev);
1733 }
1734
1735 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1736 int phy_id, bool last)
1737 {
1738 struct expander_device *ex_dev = &parent->ex_dev;
1739 struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1740 struct domain_device *child, *n;
1741 if (last) {
1742 list_for_each_entry_safe(child, n,
1743 &ex_dev->children, siblings) {
1744 if (SAS_ADDR(child->sas_addr) ==
1745 SAS_ADDR(phy->attached_sas_addr)) {
1746 if (child->dev_type == EDGE_DEV ||
1747 child->dev_type == FANOUT_DEV)
1748 sas_unregister_ex_tree(child);
1749 else
1750 sas_unregister_dev(child);
1751 break;
1752 }
1753 }
1754 sas_disable_routing(parent, phy->attached_sas_addr);
1755 }
1756 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1757 sas_port_delete_phy(phy->port, phy->phy);
1758 if (phy->port->num_phys == 0)
1759 sas_port_delete(phy->port);
1760 phy->port = NULL;
1761 }
1762
1763 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1764 const int level)
1765 {
1766 struct expander_device *ex_root = &root->ex_dev;
1767 struct domain_device *child;
1768 int res = 0;
1769
1770 list_for_each_entry(child, &ex_root->children, siblings) {
1771 if (child->dev_type == EDGE_DEV ||
1772 child->dev_type == FANOUT_DEV) {
1773 struct sas_expander_device *ex =
1774 rphy_to_expander_device(child->rphy);
1775
1776 if (level > ex->level)
1777 res = sas_discover_bfs_by_root_level(child,
1778 level);
1779 else if (level == ex->level)
1780 res = sas_ex_discover_devices(child, -1);
1781 }
1782 }
1783 return res;
1784 }
1785
1786 static int sas_discover_bfs_by_root(struct domain_device *dev)
1787 {
1788 int res;
1789 struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1790 int level = ex->level+1;
1791
1792 res = sas_ex_discover_devices(dev, -1);
1793 if (res)
1794 goto out;
1795 do {
1796 res = sas_discover_bfs_by_root_level(dev, level);
1797 mb();
1798 level += 1;
1799 } while (level <= dev->port->disc.max_level);
1800 out:
1801 return res;
1802 }
1803
1804 static int sas_discover_new(struct domain_device *dev, int phy_id)
1805 {
1806 struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1807 struct domain_device *child;
1808 bool found = false;
1809 int res, i;
1810
1811 SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1812 SAS_ADDR(dev->sas_addr), phy_id);
1813 res = sas_ex_phy_discover(dev, phy_id);
1814 if (res)
1815 goto out;
1816 /* to support the wide port inserted */
1817 for (i = 0; i < dev->ex_dev.num_phys; i++) {
1818 struct ex_phy *ex_phy_temp = &dev->ex_dev.ex_phy[i];
1819 if (i == phy_id)
1820 continue;
1821 if (SAS_ADDR(ex_phy_temp->attached_sas_addr) ==
1822 SAS_ADDR(ex_phy->attached_sas_addr)) {
1823 found = true;
1824 break;
1825 }
1826 }
1827 if (found) {
1828 sas_ex_join_wide_port(dev, phy_id);
1829 return 0;
1830 }
1831 res = sas_ex_discover_devices(dev, phy_id);
1832 if (!res)
1833 goto out;
1834 list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1835 if (SAS_ADDR(child->sas_addr) ==
1836 SAS_ADDR(ex_phy->attached_sas_addr)) {
1837 if (child->dev_type == EDGE_DEV ||
1838 child->dev_type == FANOUT_DEV)
1839 res = sas_discover_bfs_by_root(child);
1840 break;
1841 }
1842 }
1843 out:
1844 return res;
1845 }
1846
1847 static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
1848 {
1849 struct expander_device *ex = &dev->ex_dev;
1850 struct ex_phy *phy = &ex->ex_phy[phy_id];
1851 u8 attached_sas_addr[8];
1852 int res;
1853
1854 res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1855 switch (res) {
1856 case SMP_RESP_NO_PHY:
1857 phy->phy_state = PHY_NOT_PRESENT;
1858 sas_unregister_devs_sas_addr(dev, phy_id, last);
1859 goto out; break;
1860 case SMP_RESP_PHY_VACANT:
1861 phy->phy_state = PHY_VACANT;
1862 sas_unregister_devs_sas_addr(dev, phy_id, last);
1863 goto out; break;
1864 case SMP_RESP_FUNC_ACC:
1865 break;
1866 }
1867
1868 if (SAS_ADDR(attached_sas_addr) == 0) {
1869 phy->phy_state = PHY_EMPTY;
1870 sas_unregister_devs_sas_addr(dev, phy_id, last);
1871 } else if (SAS_ADDR(attached_sas_addr) ==
1872 SAS_ADDR(phy->attached_sas_addr)) {
1873 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1874 SAS_ADDR(dev->sas_addr), phy_id);
1875 sas_ex_phy_discover(dev, phy_id);
1876 } else
1877 res = sas_discover_new(dev, phy_id);
1878 out:
1879 return res;
1880 }
1881
1882 /**
1883 * sas_rediscover - revalidate the domain.
1884 * @dev:domain device to be detect.
1885 * @phy_id: the phy id will be detected.
1886 *
1887 * NOTE: this process _must_ quit (return) as soon as any connection
1888 * errors are encountered. Connection recovery is done elsewhere.
1889 * Discover process only interrogates devices in order to discover the
1890 * domain.For plugging out, we un-register the device only when it is
1891 * the last phy in the port, for other phys in this port, we just delete it
1892 * from the port.For inserting, we do discovery when it is the
1893 * first phy,for other phys in this port, we add it to the port to
1894 * forming the wide-port.
1895 */
1896 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1897 {
1898 struct expander_device *ex = &dev->ex_dev;
1899 struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1900 int res = 0;
1901 int i;
1902 bool last = true; /* is this the last phy of the port */
1903
1904 SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1905 SAS_ADDR(dev->sas_addr), phy_id);
1906
1907 if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1908 for (i = 0; i < ex->num_phys; i++) {
1909 struct ex_phy *phy = &ex->ex_phy[i];
1910
1911 if (i == phy_id)
1912 continue;
1913 if (SAS_ADDR(phy->attached_sas_addr) ==
1914 SAS_ADDR(changed_phy->attached_sas_addr)) {
1915 SAS_DPRINTK("phy%d part of wide port with "
1916 "phy%d\n", phy_id, i);
1917 last = false;
1918 break;
1919 }
1920 }
1921 res = sas_rediscover_dev(dev, phy_id, last);
1922 } else
1923 res = sas_discover_new(dev, phy_id);
1924 return res;
1925 }
1926
1927 /**
1928 * sas_revalidate_domain -- revalidate the domain
1929 * @port: port to the domain of interest
1930 *
1931 * NOTE: this process _must_ quit (return) as soon as any connection
1932 * errors are encountered. Connection recovery is done elsewhere.
1933 * Discover process only interrogates devices in order to discover the
1934 * domain.
1935 */
1936 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1937 {
1938 int res;
1939 struct domain_device *dev = NULL;
1940
1941 res = sas_find_bcast_dev(port_dev, &dev);
1942 if (res)
1943 goto out;
1944 if (dev) {
1945 struct expander_device *ex = &dev->ex_dev;
1946 int i = 0, phy_id;
1947
1948 do {
1949 phy_id = -1;
1950 res = sas_find_bcast_phy(dev, &phy_id, i, true);
1951 if (phy_id == -1)
1952 break;
1953 res = sas_rediscover(dev, phy_id);
1954 i = phy_id + 1;
1955 } while (i < ex->num_phys);
1956 }
1957 out:
1958 return res;
1959 }
1960
1961 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1962 struct request *req)
1963 {
1964 struct domain_device *dev;
1965 int ret, type;
1966 struct request *rsp = req->next_rq;
1967
1968 if (!rsp) {
1969 printk("%s: space for a smp response is missing\n",
1970 __func__);
1971 return -EINVAL;
1972 }
1973
1974 /* no rphy means no smp target support (ie aic94xx host) */
1975 if (!rphy)
1976 return sas_smp_host_handler(shost, req, rsp);
1977
1978 type = rphy->identify.device_type;
1979
1980 if (type != SAS_EDGE_EXPANDER_DEVICE &&
1981 type != SAS_FANOUT_EXPANDER_DEVICE) {
1982 printk("%s: can we send a smp request to a device?\n",
1983 __func__);
1984 return -EINVAL;
1985 }
1986
1987 dev = sas_find_dev_by_rphy(rphy);
1988 if (!dev) {
1989 printk("%s: fail to find a domain_device?\n", __func__);
1990 return -EINVAL;
1991 }
1992
1993 /* do we need to support multiple segments? */
1994 if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
1995 printk("%s: multiple segments req %u %u, rsp %u %u\n",
1996 __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
1997 rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
1998 return -EINVAL;
1999 }
2000
2001 ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2002 bio_data(rsp->bio), blk_rq_bytes(rsp));
2003 if (ret > 0) {
2004 /* positive number is the untransferred residual */
2005 rsp->resid_len = ret;
2006 req->resid_len = 0;
2007 ret = 0;
2008 } else if (ret == 0) {
2009 rsp->resid_len = 0;
2010 req->resid_len = 0;
2011 }
2012
2013 return ret;
2014 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree