?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[SUNLANCE]: Mark sparc_lance_probe_one as __devinit.
[linux-2.6/verdex.git] / drivers / scsi / libsas / sas_scsi_host.c
blob7f9e89bcac7eacc4feae3b9a9bc6df846244a1c6
1 /*
2 * Serial Attached SCSI (SAS) class SCSI Host glue.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 */
25
26 #include "sas_internal.h"
27
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_tcq.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_sas.h>
34 #include "../scsi_sas_internal.h"
35
36 #include <linux/err.h>
37 #include <linux/blkdev.h>
38 #include <linux/scatterlist.h>
39
40 /* ---------- SCSI Host glue ---------- */
41
42 #define TO_SAS_TASK(_scsi_cmd) ((void *)(_scsi_cmd)->host_scribble)
43 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
44
45 static void sas_scsi_task_done(struct sas_task *task)
46 {
47 struct task_status_struct *ts = &task->task_status;
48 struct scsi_cmnd *sc = task->uldd_task;
49 unsigned ts_flags = task->task_state_flags;
50 int hs = 0, stat = 0;
51
52 if (unlikely(!sc)) {
53 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
54 list_del_init(&task->list);
55 sas_free_task(task);
56 return;
57 }
58
59 if (ts->resp == SAS_TASK_UNDELIVERED) {
60 /* transport error */
61 hs = DID_NO_CONNECT;
62 } else { /* ts->resp == SAS_TASK_COMPLETE */
63 /* task delivered, what happened afterwards? */
64 switch (ts->stat) {
65 case SAS_DEV_NO_RESPONSE:
66 case SAS_INTERRUPTED:
67 case SAS_PHY_DOWN:
68 case SAS_NAK_R_ERR:
69 case SAS_OPEN_TO:
70 hs = DID_NO_CONNECT;
71 break;
72 case SAS_DATA_UNDERRUN:
73 sc->resid = ts->residual;
74 if (sc->request_bufflen - sc->resid < sc->underflow)
75 hs = DID_ERROR;
76 break;
77 case SAS_DATA_OVERRUN:
78 hs = DID_ERROR;
79 break;
80 case SAS_QUEUE_FULL:
81 hs = DID_SOFT_ERROR; /* retry */
82 break;
83 case SAS_DEVICE_UNKNOWN:
84 hs = DID_BAD_TARGET;
85 break;
86 case SAS_SG_ERR:
87 hs = DID_PARITY;
88 break;
89 case SAS_OPEN_REJECT:
90 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
91 hs = DID_SOFT_ERROR; /* retry */
92 else
93 hs = DID_ERROR;
94 break;
95 case SAS_PROTO_RESPONSE:
96 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
97 "task; please report this\n",
98 task->dev->port->ha->sas_ha_name);
99 break;
100 case SAS_ABORTED_TASK:
101 hs = DID_ABORT;
102 break;
103 case SAM_CHECK_COND:
104 memcpy(sc->sense_buffer, ts->buf,
105 max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
106 stat = SAM_CHECK_COND;
107 break;
108 default:
109 stat = ts->stat;
110 break;
111 }
112 }
113 ASSIGN_SAS_TASK(sc, NULL);
114 sc->result = (hs << 16) | stat;
115 list_del_init(&task->list);
116 sas_free_task(task);
117 /* This is very ugly but this is how SCSI Core works. */
118 if (ts_flags & SAS_TASK_STATE_ABORTED)
119 scsi_finish_command(sc);
120 else
121 sc->scsi_done(sc);
122 }
123
124 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
125 {
126 enum task_attribute ta = TASK_ATTR_SIMPLE;
127 if (cmd->request && blk_rq_tagged(cmd->request)) {
128 if (cmd->device->ordered_tags &&
129 (cmd->request->flags & REQ_HARDBARRIER))
130 ta = TASK_ATTR_HOQ;
131 }
132 return ta;
133 }
134
135 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
136 struct domain_device *dev,
137 gfp_t gfp_flags)
138 {
139 struct sas_task *task = sas_alloc_task(gfp_flags);
140 struct scsi_lun lun;
141
142 if (!task)
143 return NULL;
144
145 *(u32 *)cmd->sense_buffer = 0;
146 task->uldd_task = cmd;
147 ASSIGN_SAS_TASK(cmd, task);
148
149 task->dev = dev;
150 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
151
152 task->ssp_task.retry_count = 1;
153 int_to_scsilun(cmd->device->lun, &lun);
154 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
155 task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
156 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
157
158 task->scatter = cmd->request_buffer;
159 task->num_scatter = cmd->use_sg;
160 task->total_xfer_len = cmd->request_bufflen;
161 task->data_dir = cmd->sc_data_direction;
162
163 task->task_done = sas_scsi_task_done;
164
165 return task;
166 }
167
168 static int sas_queue_up(struct sas_task *task)
169 {
170 struct sas_ha_struct *sas_ha = task->dev->port->ha;
171 struct scsi_core *core = &sas_ha->core;
172 unsigned long flags;
173 LIST_HEAD(list);
174
175 spin_lock_irqsave(&core->task_queue_lock, flags);
176 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
177 spin_unlock_irqrestore(&core->task_queue_lock, flags);
178 return -SAS_QUEUE_FULL;
179 }
180 list_add_tail(&task->list, &core->task_queue);
181 core->task_queue_size += 1;
182 spin_unlock_irqrestore(&core->task_queue_lock, flags);
183 up(&core->queue_thread_sema);
184
185 return 0;
186 }
187
188 /**
189 * sas_queuecommand -- Enqueue a command for processing
190 * @parameters: See SCSI Core documentation
191 *
192 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
193 * call us without holding an IRQ spinlock...
194 */
195 int sas_queuecommand(struct scsi_cmnd *cmd,
196 void (*scsi_done)(struct scsi_cmnd *))
197 {
198 int res = 0;
199 struct domain_device *dev = cmd_to_domain_dev(cmd);
200 struct Scsi_Host *host = cmd->device->host;
201 struct sas_internal *i = to_sas_internal(host->transportt);
202
203 spin_unlock_irq(host->host_lock);
204
205 {
206 struct sas_ha_struct *sas_ha = dev->port->ha;
207 struct sas_task *task;
208
209 res = -ENOMEM;
210 task = sas_create_task(cmd, dev, GFP_ATOMIC);
211 if (!task)
212 goto out;
213
214 cmd->scsi_done = scsi_done;
215 /* Queue up, Direct Mode or Task Collector Mode. */
216 if (sas_ha->lldd_max_execute_num < 2)
217 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
218 else
219 res = sas_queue_up(task);
220
221 /* Examine */
222 if (res) {
223 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
224 ASSIGN_SAS_TASK(cmd, NULL);
225 sas_free_task(task);
226 if (res == -SAS_QUEUE_FULL) {
227 cmd->result = DID_SOFT_ERROR << 16; /* retry */
228 res = 0;
229 scsi_done(cmd);
230 }
231 goto out;
232 }
233 }
234 out:
235 spin_lock_irq(host->host_lock);
236 return res;
237 }
238
239 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
240 {
241 struct scsi_cmnd *cmd, *n;
242
243 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
244 if (cmd == my_cmd)
245 list_del_init(&cmd->eh_entry);
246 }
247 }
248
249 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
250 struct domain_device *dev)
251 {
252 struct scsi_cmnd *cmd, *n;
253
254 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
255 struct domain_device *x = cmd_to_domain_dev(cmd);
256
257 if (x == dev)
258 list_del_init(&cmd->eh_entry);
259 }
260 }
261
262 static void sas_scsi_clear_queue_port(struct list_head *error_q,
263 struct asd_sas_port *port)
264 {
265 struct scsi_cmnd *cmd, *n;
266
267 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
268 struct domain_device *dev = cmd_to_domain_dev(cmd);
269 struct asd_sas_port *x = dev->port;
270
271 if (x == port)
272 list_del_init(&cmd->eh_entry);
273 }
274 }
275
276 enum task_disposition {
277 TASK_IS_DONE,
278 TASK_IS_ABORTED,
279 TASK_IS_AT_LU,
280 TASK_IS_NOT_AT_LU,
281 };
282
283 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
284 {
285 struct sas_ha_struct *ha = task->dev->port->ha;
286 unsigned long flags;
287 int i, res;
288 struct sas_internal *si =
289 to_sas_internal(task->dev->port->ha->core.shost->transportt);
290
291 if (ha->lldd_max_execute_num > 1) {
292 struct scsi_core *core = &ha->core;
293 struct sas_task *t, *n;
294
295 spin_lock_irqsave(&core->task_queue_lock, flags);
296 list_for_each_entry_safe(t, n, &core->task_queue, list) {
297 if (task == t) {
298 list_del_init(&t->list);
299 spin_unlock_irqrestore(&core->task_queue_lock,
300 flags);
301 SAS_DPRINTK("%s: task 0x%p aborted from "
302 "task_queue\n",
303 __FUNCTION__, task);
304 return TASK_IS_ABORTED;
305 }
306 }
307 spin_unlock_irqrestore(&core->task_queue_lock, flags);
308 }
309
310 for (i = 0; i < 5; i++) {
311 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
312 res = si->dft->lldd_abort_task(task);
313
314 spin_lock_irqsave(&task->task_state_lock, flags);
315 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
316 spin_unlock_irqrestore(&task->task_state_lock, flags);
317 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
318 task);
319 return TASK_IS_DONE;
320 }
321 spin_unlock_irqrestore(&task->task_state_lock, flags);
322
323 if (res == TMF_RESP_FUNC_COMPLETE) {
324 SAS_DPRINTK("%s: task 0x%p is aborted\n",
325 __FUNCTION__, task);
326 return TASK_IS_ABORTED;
327 } else if (si->dft->lldd_query_task) {
328 SAS_DPRINTK("%s: querying task 0x%p\n",
329 __FUNCTION__, task);
330 res = si->dft->lldd_query_task(task);
331 if (res == TMF_RESP_FUNC_SUCC) {
332 SAS_DPRINTK("%s: task 0x%p at LU\n",
333 __FUNCTION__, task);
334 return TASK_IS_AT_LU;
335 } else if (res == TMF_RESP_FUNC_COMPLETE) {
336 SAS_DPRINTK("%s: task 0x%p not at LU\n",
337 __FUNCTION__, task);
338 return TASK_IS_NOT_AT_LU;
339 }
340 }
341 }
342 return res;
343 }
344
345 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
346 {
347 int res = TMF_RESP_FUNC_FAILED;
348 struct scsi_lun lun;
349 struct sas_internal *i =
350 to_sas_internal(dev->port->ha->core.shost->transportt);
351
352 int_to_scsilun(cmd->device->lun, &lun);
353
354 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
355 SAS_ADDR(dev->sas_addr),
356 cmd->device->lun);
357
358 if (i->dft->lldd_abort_task_set)
359 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
360
361 if (res == TMF_RESP_FUNC_FAILED) {
362 if (i->dft->lldd_clear_task_set)
363 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
364 }
365
366 if (res == TMF_RESP_FUNC_FAILED) {
367 if (i->dft->lldd_lu_reset)
368 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
369 }
370
371 return res;
372 }
373
374 static int sas_recover_I_T(struct domain_device *dev)
375 {
376 int res = TMF_RESP_FUNC_FAILED;
377 struct sas_internal *i =
378 to_sas_internal(dev->port->ha->core.shost->transportt);
379
380 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
381 SAS_ADDR(dev->sas_addr));
382
383 if (i->dft->lldd_I_T_nexus_reset)
384 res = i->dft->lldd_I_T_nexus_reset(dev);
385
386 return res;
387 }
388
389 void sas_scsi_recover_host(struct Scsi_Host *shost)
390 {
391 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
392 unsigned long flags;
393 LIST_HEAD(error_q);
394 struct scsi_cmnd *cmd, *n;
395 enum task_disposition res = TASK_IS_DONE;
396 int tmf_resp;
397 struct sas_internal *i = to_sas_internal(shost->transportt);
398
399 spin_lock_irqsave(shost->host_lock, flags);
400 list_splice_init(&shost->eh_cmd_q, &error_q);
401 spin_unlock_irqrestore(shost->host_lock, flags);
402
403 SAS_DPRINTK("Enter %s\n", __FUNCTION__);
404
405 /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
406 * by sas_scsi_timed_out() callback.
407 */
408 Again:
409 SAS_DPRINTK("going over list...\n");
410 list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
411 struct sas_task *task = TO_SAS_TASK(cmd);
412
413 SAS_DPRINTK("trying to find task 0x%p\n", task);
414 list_del_init(&cmd->eh_entry);
415 res = sas_scsi_find_task(task);
416
417 cmd->eh_eflags = 0;
418 shost->host_failed--;
419
420 switch (res) {
421 case TASK_IS_DONE:
422 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
423 task);
424 task->task_done(task);
425 continue;
426 case TASK_IS_ABORTED:
427 SAS_DPRINTK("%s: task 0x%p is aborted\n",
428 __FUNCTION__, task);
429 task->task_done(task);
430 continue;
431 case TASK_IS_AT_LU:
432 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
433 tmf_resp = sas_recover_lu(task->dev, cmd);
434 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
435 SAS_DPRINTK("dev %016llx LU %x is "
436 "recovered\n",
437 SAS_ADDR(task->dev),
438 cmd->device->lun);
439 task->task_done(task);
440 sas_scsi_clear_queue_lu(&error_q, cmd);
441 goto Again;
442 }
443 /* fallthrough */
444 case TASK_IS_NOT_AT_LU:
445 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
446 task);
447 tmf_resp = sas_recover_I_T(task->dev);
448 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
449 SAS_DPRINTK("I_T %016llx recovered\n",
450 SAS_ADDR(task->dev->sas_addr));
451 task->task_done(task);
452 sas_scsi_clear_queue_I_T(&error_q, task->dev);
453 goto Again;
454 }
455 /* Hammer time :-) */
456 if (i->dft->lldd_clear_nexus_port) {
457 struct asd_sas_port *port = task->dev->port;
458 SAS_DPRINTK("clearing nexus for port:%d\n",
459 port->id);
460 res = i->dft->lldd_clear_nexus_port(port);
461 if (res == TMF_RESP_FUNC_COMPLETE) {
462 SAS_DPRINTK("clear nexus port:%d "
463 "succeeded\n", port->id);
464 task->task_done(task);
465 sas_scsi_clear_queue_port(&error_q,
466 port);
467 goto Again;
468 }
469 }
470 if (i->dft->lldd_clear_nexus_ha) {
471 SAS_DPRINTK("clear nexus ha\n");
472 res = i->dft->lldd_clear_nexus_ha(ha);
473 if (res == TMF_RESP_FUNC_COMPLETE) {
474 SAS_DPRINTK("clear nexus ha "
475 "succeeded\n");
476 task->task_done(task);
477 goto out;
478 }
479 }
480 /* If we are here -- this means that no amount
481 * of effort could recover from errors. Quite
482 * possibly the HA just disappeared.
483 */
484 SAS_DPRINTK("error from device %llx, LUN %x "
485 "couldn't be recovered in any way\n",
486 SAS_ADDR(task->dev->sas_addr),
487 cmd->device->lun);
488
489 task->task_done(task);
490 goto clear_q;
491 }
492 }
493 out:
494 SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
495 return;
496 clear_q:
497 SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
498 list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
499 struct sas_task *task = TO_SAS_TASK(cmd);
500 list_del_init(&cmd->eh_entry);
501 task->task_done(task);
502 }
503 }
504
505 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
506 {
507 struct sas_task *task = TO_SAS_TASK(cmd);
508 unsigned long flags;
509
510 if (!task) {
511 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
512 cmd, task);
513 return EH_HANDLED;
514 }
515
516 spin_lock_irqsave(&task->task_state_lock, flags);
517 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
518 spin_unlock_irqrestore(&task->task_state_lock, flags);
519 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
520 cmd, task);
521 return EH_HANDLED;
522 }
523 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
524 spin_unlock_irqrestore(&task->task_state_lock, flags);
525
526 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
527 cmd, task);
528
529 return EH_NOT_HANDLED;
530 }
531
532 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
533 {
534 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
535 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
536 struct domain_device *found_dev = NULL;
537 int i;
538
539 spin_lock(&ha->phy_port_lock);
540 for (i = 0; i < ha->num_phys; i++) {
541 struct asd_sas_port *port = ha->sas_port[i];
542 struct domain_device *dev;
543
544 spin_lock(&port->dev_list_lock);
545 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
546 if (rphy == dev->rphy) {
547 found_dev = dev;
548 spin_unlock(&port->dev_list_lock);
549 goto found;
550 }
551 }
552 spin_unlock(&port->dev_list_lock);
553 }
554 found:
555 spin_unlock(&ha->phy_port_lock);
556
557 return found_dev;
558 }
559
560 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
561 {
562 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
563
564 return sas_find_dev_by_rphy(rphy);
565 }
566
567 int sas_target_alloc(struct scsi_target *starget)
568 {
569 struct domain_device *found_dev = sas_find_target(starget);
570
571 if (!found_dev)
572 return -ENODEV;
573
574 starget->hostdata = found_dev;
575 return 0;
576 }
577
578 #define SAS_DEF_QD 32
579 #define SAS_MAX_QD 64
580
581 int sas_slave_configure(struct scsi_device *scsi_dev)
582 {
583 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
584 struct sas_ha_struct *sas_ha;
585
586 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
587
588 sas_ha = dev->port->ha;
589
590 sas_read_port_mode_page(scsi_dev);
591
592 if (scsi_dev->tagged_supported) {
593 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
594 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
595 } else {
596 SAS_DPRINTK("device %llx, LUN %x doesn't support "
597 "TCQ\n", SAS_ADDR(dev->sas_addr),
598 scsi_dev->lun);
599 scsi_dev->tagged_supported = 0;
600 scsi_set_tag_type(scsi_dev, 0);
601 scsi_deactivate_tcq(scsi_dev, 1);
602 }
603
604 return 0;
605 }
606
607 void sas_slave_destroy(struct scsi_device *scsi_dev)
608 {
609 }
610
611 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
612 {
613 int res = min(new_depth, SAS_MAX_QD);
614
615 if (scsi_dev->tagged_supported)
616 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
617 res);
618 else {
619 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
620 sas_printk("device %llx LUN %x queue depth changed to 1\n",
621 SAS_ADDR(dev->sas_addr),
622 scsi_dev->lun);
623 scsi_adjust_queue_depth(scsi_dev, 0, 1);
624 res = 1;
625 }
626
627 return res;
628 }
629
630 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
631 {
632 if (!scsi_dev->tagged_supported)
633 return 0;
634
635 scsi_deactivate_tcq(scsi_dev, 1);
636
637 scsi_set_tag_type(scsi_dev, qt);
638 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
639
640 return qt;
641 }
642
643 int sas_bios_param(struct scsi_device *scsi_dev,
644 struct block_device *bdev,
645 sector_t capacity, int *hsc)
646 {
647 hsc[0] = 255;
648 hsc[1] = 63;
649 sector_div(capacity, 255*63);
650 hsc[2] = capacity;
651
652 return 0;
653 }
654
655 /* ---------- Task Collector Thread implementation ---------- */
656
657 static void sas_queue(struct sas_ha_struct *sas_ha)
658 {
659 struct scsi_core *core = &sas_ha->core;
660 unsigned long flags;
661 LIST_HEAD(q);
662 int can_queue;
663 int res;
664 struct sas_internal *i = to_sas_internal(core->shost->transportt);
665
666 spin_lock_irqsave(&core->task_queue_lock, flags);
667 while (!core->queue_thread_kill &&
668 !list_empty(&core->task_queue)) {
669
670 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
671 if (can_queue >= 0) {
672 can_queue = core->task_queue_size;
673 list_splice_init(&core->task_queue, &q);
674 } else {
675 struct list_head *a, *n;
676
677 can_queue = sas_ha->lldd_queue_size;
678 list_for_each_safe(a, n, &core->task_queue) {
679 list_move_tail(a, &q);
680 if (--can_queue == 0)
681 break;
682 }
683 can_queue = sas_ha->lldd_queue_size;
684 }
685 core->task_queue_size -= can_queue;
686 spin_unlock_irqrestore(&core->task_queue_lock, flags);
687 {
688 struct sas_task *task = list_entry(q.next,
689 struct sas_task,
690 list);
691 list_del_init(&q);
692 res = i->dft->lldd_execute_task(task, can_queue,
693 GFP_KERNEL);
694 if (unlikely(res))
695 __list_add(&q, task->list.prev, &task->list);
696 }
697 spin_lock_irqsave(&core->task_queue_lock, flags);
698 if (res) {
699 list_splice_init(&q, &core->task_queue); /*at head*/
700 core->task_queue_size += can_queue;
701 }
702 }
703 spin_unlock_irqrestore(&core->task_queue_lock, flags);
704 }
705
706 static DECLARE_COMPLETION(queue_th_comp);
707
708 /**
709 * sas_queue_thread -- The Task Collector thread
710 * @_sas_ha: pointer to struct sas_ha
711 */
712 static int sas_queue_thread(void *_sas_ha)
713 {
714 struct sas_ha_struct *sas_ha = _sas_ha;
715 struct scsi_core *core = &sas_ha->core;
716
717 daemonize("sas_queue_%d", core->shost->host_no);
718 current->flags |= PF_NOFREEZE;
719
720 complete(&queue_th_comp);
721
722 while (1) {
723 down_interruptible(&core->queue_thread_sema);
724 sas_queue(sas_ha);
725 if (core->queue_thread_kill)
726 break;
727 }
728
729 complete(&queue_th_comp);
730
731 return 0;
732 }
733
734 int sas_init_queue(struct sas_ha_struct *sas_ha)
735 {
736 int res;
737 struct scsi_core *core = &sas_ha->core;
738
739 spin_lock_init(&core->task_queue_lock);
740 core->task_queue_size = 0;
741 INIT_LIST_HEAD(&core->task_queue);
742 init_MUTEX_LOCKED(&core->queue_thread_sema);
743
744 res = kernel_thread(sas_queue_thread, sas_ha, 0);
745 if (res >= 0)
746 wait_for_completion(&queue_th_comp);
747
748 return res < 0 ? res : 0;
749 }
750
751 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
752 {
753 unsigned long flags;
754 struct scsi_core *core = &sas_ha->core;
755 struct sas_task *task, *n;
756
757 init_completion(&queue_th_comp);
758 core->queue_thread_kill = 1;
759 up(&core->queue_thread_sema);
760 wait_for_completion(&queue_th_comp);
761
762 if (!list_empty(&core->task_queue))
763 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
764 SAS_ADDR(sas_ha->sas_addr));
765
766 spin_lock_irqsave(&core->task_queue_lock, flags);
767 list_for_each_entry_safe(task, n, &core->task_queue, list) {
768 struct scsi_cmnd *cmd = task->uldd_task;
769
770 list_del_init(&task->list);
771
772 ASSIGN_SAS_TASK(cmd, NULL);
773 sas_free_task(task);
774 cmd->result = DID_ABORT << 16;
775 cmd->scsi_done(cmd);
776 }
777 spin_unlock_irqrestore(&core->task_queue_lock, flags);
778 }
779
780 EXPORT_SYMBOL_GPL(sas_queuecommand);
781 EXPORT_SYMBOL_GPL(sas_target_alloc);
782 EXPORT_SYMBOL_GPL(sas_slave_configure);
783 EXPORT_SYMBOL_GPL(sas_slave_destroy);
784 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
785 EXPORT_SYMBOL_GPL(sas_change_queue_type);
786 EXPORT_SYMBOL_GPL(sas_bios_param);
Verdex Pro support