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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 <linux/kthread.h>
27 #include <linux/firmware.h>
28 #include <linux/export.h>
29 #include <linux/ctype.h>
30 
31 #include "sas_internal.h"
32 
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_eh.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_sas.h>
40 #include <scsi/sas_ata.h>
41 #include "../scsi_sas_internal.h"
42 #include "../scsi_transport_api.h"
43 #include "../scsi_priv.h"
44 
45 #include <linux/err.h>
46 #include <linux/blkdev.h>
47 #include <linux/freezer.h>
48 #include <linux/gfp.h>
49 #include <linux/scatterlist.h>
50 #include <linux/libata.h>
51 
52 /* record final status and free the task */
sas_end_task(struct scsi_cmnd * sc,struct sas_task * task)53 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
54 {
55 	struct task_status_struct *ts = &task->task_status;
56 	int hs = 0, stat = 0;
57 
58 	if (ts->resp == SAS_TASK_UNDELIVERED) {
59 		/* transport error */
60 		hs = DID_NO_CONNECT;
61 	} else { /* ts->resp == SAS_TASK_COMPLETE */
62 		/* task delivered, what happened afterwards? */
63 		switch (ts->stat) {
64 		case SAS_DEV_NO_RESPONSE:
65 		case SAS_INTERRUPTED:
66 		case SAS_PHY_DOWN:
67 		case SAS_NAK_R_ERR:
68 		case SAS_OPEN_TO:
69 			hs = DID_NO_CONNECT;
70 			break;
71 		case SAS_DATA_UNDERRUN:
72 			scsi_set_resid(sc, ts->residual);
73 			if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
74 				hs = DID_ERROR;
75 			break;
76 		case SAS_DATA_OVERRUN:
77 			hs = DID_ERROR;
78 			break;
79 		case SAS_QUEUE_FULL:
80 			hs = DID_SOFT_ERROR; /* retry */
81 			break;
82 		case SAS_DEVICE_UNKNOWN:
83 			hs = DID_BAD_TARGET;
84 			break;
85 		case SAS_SG_ERR:
86 			hs = DID_PARITY;
87 			break;
88 		case SAS_OPEN_REJECT:
89 			if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
90 				hs = DID_SOFT_ERROR; /* retry */
91 			else
92 				hs = DID_ERROR;
93 			break;
94 		case SAS_PROTO_RESPONSE:
95 			SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
96 				    "task; please report this\n",
97 				    task->dev->port->ha->sas_ha_name);
98 			break;
99 		case SAS_ABORTED_TASK:
100 			hs = DID_ABORT;
101 			break;
102 		case SAM_STAT_CHECK_CONDITION:
103 			memcpy(sc->sense_buffer, ts->buf,
104 			       min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
105 			stat = SAM_STAT_CHECK_CONDITION;
106 			break;
107 		default:
108 			stat = ts->stat;
109 			break;
110 		}
111 	}
112 
113 	sc->result = (hs << 16) | stat;
114 	ASSIGN_SAS_TASK(sc, NULL);
115 	sas_free_task(task);
116 }
117 
sas_scsi_task_done(struct sas_task * task)118 static void sas_scsi_task_done(struct sas_task *task)
119 {
120 	struct scsi_cmnd *sc = task->uldd_task;
121 	struct domain_device *dev = task->dev;
122 	struct sas_ha_struct *ha = dev->port->ha;
123 	unsigned long flags;
124 
125 	spin_lock_irqsave(&dev->done_lock, flags);
126 	if (test_bit(SAS_HA_FROZEN, &ha->state))
127 		task = NULL;
128 	else
129 		ASSIGN_SAS_TASK(sc, NULL);
130 	spin_unlock_irqrestore(&dev->done_lock, flags);
131 
132 	if (unlikely(!task)) {
133 		/* task will be completed by the error handler */
134 		SAS_DPRINTK("task done but aborted\n");
135 		return;
136 	}
137 
138 	if (unlikely(!sc)) {
139 		SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
140 		sas_free_task(task);
141 		return;
142 	}
143 
144 	sas_end_task(sc, task);
145 	sc->scsi_done(sc);
146 }
147 
sas_create_task(struct scsi_cmnd * cmd,struct domain_device * dev,gfp_t gfp_flags)148 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
149 					       struct domain_device *dev,
150 					       gfp_t gfp_flags)
151 {
152 	struct sas_task *task = sas_alloc_task(gfp_flags);
153 	struct scsi_lun lun;
154 
155 	if (!task)
156 		return NULL;
157 
158 	task->uldd_task = cmd;
159 	ASSIGN_SAS_TASK(cmd, task);
160 
161 	task->dev = dev;
162 	task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
163 
164 	task->ssp_task.retry_count = 1;
165 	int_to_scsilun(cmd->device->lun, &lun);
166 	memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
167 	task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
168 	task->ssp_task.cmd = cmd;
169 
170 	task->scatter = scsi_sglist(cmd);
171 	task->num_scatter = scsi_sg_count(cmd);
172 	task->total_xfer_len = scsi_bufflen(cmd);
173 	task->data_dir = cmd->sc_data_direction;
174 
175 	task->task_done = sas_scsi_task_done;
176 
177 	return task;
178 }
179 
sas_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * cmd)180 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
181 {
182 	struct sas_internal *i = to_sas_internal(host->transportt);
183 	struct domain_device *dev = cmd_to_domain_dev(cmd);
184 	struct sas_task *task;
185 	int res = 0;
186 
187 	/* If the device fell off, no sense in issuing commands */
188 	if (test_bit(SAS_DEV_GONE, &dev->state)) {
189 		cmd->result = DID_BAD_TARGET << 16;
190 		goto out_done;
191 	}
192 
193 	if (dev_is_sata(dev)) {
194 		spin_lock_irq(dev->sata_dev.ap->lock);
195 		res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
196 		spin_unlock_irq(dev->sata_dev.ap->lock);
197 		return res;
198 	}
199 
200 	task = sas_create_task(cmd, dev, GFP_ATOMIC);
201 	if (!task)
202 		return SCSI_MLQUEUE_HOST_BUSY;
203 
204 	res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
205 	if (res)
206 		goto out_free_task;
207 	return 0;
208 
209 out_free_task:
210 	SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
211 	ASSIGN_SAS_TASK(cmd, NULL);
212 	sas_free_task(task);
213 	if (res == -SAS_QUEUE_FULL)
214 		cmd->result = DID_SOFT_ERROR << 16; /* retry */
215 	else
216 		cmd->result = DID_ERROR << 16;
217 out_done:
218 	cmd->scsi_done(cmd);
219 	return 0;
220 }
221 
sas_eh_finish_cmd(struct scsi_cmnd * cmd)222 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
223 {
224 	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
225 	struct domain_device *dev = cmd_to_domain_dev(cmd);
226 	struct sas_task *task = TO_SAS_TASK(cmd);
227 
228 	/* At this point, we only get called following an actual abort
229 	 * of the task, so we should be guaranteed not to be racing with
230 	 * any completions from the LLD.  Task is freed after this.
231 	 */
232 	sas_end_task(cmd, task);
233 
234 	if (dev_is_sata(dev)) {
235 		/* defer commands to libata so that libata EH can
236 		 * handle ata qcs correctly
237 		 */
238 		list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
239 		return;
240 	}
241 
242 	/* now finish the command and move it on to the error
243 	 * handler done list, this also takes it off the
244 	 * error handler pending list.
245 	 */
246 	scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
247 }
248 
sas_scsi_clear_queue_lu(struct list_head * error_q,struct scsi_cmnd * my_cmd)249 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
250 {
251 	struct scsi_cmnd *cmd, *n;
252 
253 	list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
254 		if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
255 		    cmd->device->lun == my_cmd->device->lun)
256 			sas_eh_finish_cmd(cmd);
257 	}
258 }
259 
sas_scsi_clear_queue_I_T(struct list_head * error_q,struct domain_device * dev)260 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
261 				     struct domain_device *dev)
262 {
263 	struct scsi_cmnd *cmd, *n;
264 
265 	list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
266 		struct domain_device *x = cmd_to_domain_dev(cmd);
267 
268 		if (x == dev)
269 			sas_eh_finish_cmd(cmd);
270 	}
271 }
272 
sas_scsi_clear_queue_port(struct list_head * error_q,struct asd_sas_port * port)273 static void sas_scsi_clear_queue_port(struct list_head *error_q,
274 				      struct asd_sas_port *port)
275 {
276 	struct scsi_cmnd *cmd, *n;
277 
278 	list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
279 		struct domain_device *dev = cmd_to_domain_dev(cmd);
280 		struct asd_sas_port *x = dev->port;
281 
282 		if (x == port)
283 			sas_eh_finish_cmd(cmd);
284 	}
285 }
286 
287 enum task_disposition {
288 	TASK_IS_DONE,
289 	TASK_IS_ABORTED,
290 	TASK_IS_AT_LU,
291 	TASK_IS_NOT_AT_LU,
292 	TASK_ABORT_FAILED,
293 };
294 
sas_scsi_find_task(struct sas_task * task)295 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
296 {
297 	unsigned long flags;
298 	int i, res;
299 	struct sas_internal *si =
300 		to_sas_internal(task->dev->port->ha->core.shost->transportt);
301 
302 	for (i = 0; i < 5; i++) {
303 		SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
304 		res = si->dft->lldd_abort_task(task);
305 
306 		spin_lock_irqsave(&task->task_state_lock, flags);
307 		if (task->task_state_flags & SAS_TASK_STATE_DONE) {
308 			spin_unlock_irqrestore(&task->task_state_lock, flags);
309 			SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
310 				    task);
311 			return TASK_IS_DONE;
312 		}
313 		spin_unlock_irqrestore(&task->task_state_lock, flags);
314 
315 		if (res == TMF_RESP_FUNC_COMPLETE) {
316 			SAS_DPRINTK("%s: task 0x%p is aborted\n",
317 				    __func__, task);
318 			return TASK_IS_ABORTED;
319 		} else if (si->dft->lldd_query_task) {
320 			SAS_DPRINTK("%s: querying task 0x%p\n",
321 				    __func__, task);
322 			res = si->dft->lldd_query_task(task);
323 			switch (res) {
324 			case TMF_RESP_FUNC_SUCC:
325 				SAS_DPRINTK("%s: task 0x%p at LU\n",
326 					    __func__, task);
327 				return TASK_IS_AT_LU;
328 			case TMF_RESP_FUNC_COMPLETE:
329 				SAS_DPRINTK("%s: task 0x%p not at LU\n",
330 					    __func__, task);
331 				return TASK_IS_NOT_AT_LU;
332 			case TMF_RESP_FUNC_FAILED:
333                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
334                                                 __func__, task);
335                                 return TASK_ABORT_FAILED;
336                         }
337 
338 		}
339 	}
340 	return res;
341 }
342 
sas_recover_lu(struct domain_device * dev,struct scsi_cmnd * cmd)343 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
344 {
345 	int res = TMF_RESP_FUNC_FAILED;
346 	struct scsi_lun lun;
347 	struct sas_internal *i =
348 		to_sas_internal(dev->port->ha->core.shost->transportt);
349 
350 	int_to_scsilun(cmd->device->lun, &lun);
351 
352 	SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
353 		    SAS_ADDR(dev->sas_addr),
354 		    cmd->device->lun);
355 
356 	if (i->dft->lldd_abort_task_set)
357 		res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
358 
359 	if (res == TMF_RESP_FUNC_FAILED) {
360 		if (i->dft->lldd_clear_task_set)
361 			res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
362 	}
363 
364 	if (res == TMF_RESP_FUNC_FAILED) {
365 		if (i->dft->lldd_lu_reset)
366 			res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
367 	}
368 
369 	return res;
370 }
371 
sas_recover_I_T(struct domain_device * dev)372 static int sas_recover_I_T(struct domain_device *dev)
373 {
374 	int res = TMF_RESP_FUNC_FAILED;
375 	struct sas_internal *i =
376 		to_sas_internal(dev->port->ha->core.shost->transportt);
377 
378 	SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
379 		    SAS_ADDR(dev->sas_addr));
380 
381 	if (i->dft->lldd_I_T_nexus_reset)
382 		res = i->dft->lldd_I_T_nexus_reset(dev);
383 
384 	return res;
385 }
386 
387 /* take a reference on the last known good phy for this device */
sas_get_local_phy(struct domain_device * dev)388 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
389 {
390 	struct sas_ha_struct *ha = dev->port->ha;
391 	struct sas_phy *phy;
392 	unsigned long flags;
393 
394 	/* a published domain device always has a valid phy, it may be
395 	 * stale, but it is never NULL
396 	 */
397 	BUG_ON(!dev->phy);
398 
399 	spin_lock_irqsave(&ha->phy_port_lock, flags);
400 	phy = dev->phy;
401 	get_device(&phy->dev);
402 	spin_unlock_irqrestore(&ha->phy_port_lock, flags);
403 
404 	return phy;
405 }
406 EXPORT_SYMBOL_GPL(sas_get_local_phy);
407 
sas_wait_eh(struct domain_device * dev)408 static void sas_wait_eh(struct domain_device *dev)
409 {
410 	struct sas_ha_struct *ha = dev->port->ha;
411 	DEFINE_WAIT(wait);
412 
413 	if (dev_is_sata(dev)) {
414 		ata_port_wait_eh(dev->sata_dev.ap);
415 		return;
416 	}
417  retry:
418 	spin_lock_irq(&ha->lock);
419 
420 	while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
421 		prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
422 		spin_unlock_irq(&ha->lock);
423 		schedule();
424 		spin_lock_irq(&ha->lock);
425 	}
426 	finish_wait(&ha->eh_wait_q, &wait);
427 
428 	spin_unlock_irq(&ha->lock);
429 
430 	/* make sure SCSI EH is complete */
431 	if (scsi_host_in_recovery(ha->core.shost)) {
432 		msleep(10);
433 		goto retry;
434 	}
435 }
436 EXPORT_SYMBOL(sas_wait_eh);
437 
sas_queue_reset(struct domain_device * dev,int reset_type,u64 lun,int wait)438 static int sas_queue_reset(struct domain_device *dev, int reset_type,
439 			   u64 lun, int wait)
440 {
441 	struct sas_ha_struct *ha = dev->port->ha;
442 	int scheduled = 0, tries = 100;
443 
444 	/* ata: promote lun reset to bus reset */
445 	if (dev_is_sata(dev)) {
446 		sas_ata_schedule_reset(dev);
447 		if (wait)
448 			sas_ata_wait_eh(dev);
449 		return SUCCESS;
450 	}
451 
452 	while (!scheduled && tries--) {
453 		spin_lock_irq(&ha->lock);
454 		if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
455 		    !test_bit(reset_type, &dev->state)) {
456 			scheduled = 1;
457 			ha->eh_active++;
458 			list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
459 			set_bit(SAS_DEV_EH_PENDING, &dev->state);
460 			set_bit(reset_type, &dev->state);
461 			int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
462 			scsi_schedule_eh(ha->core.shost);
463 		}
464 		spin_unlock_irq(&ha->lock);
465 
466 		if (wait)
467 			sas_wait_eh(dev);
468 
469 		if (scheduled)
470 			return SUCCESS;
471 	}
472 
473 	SAS_DPRINTK("%s reset of %s failed\n",
474 		    reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
475 		    dev_name(&dev->rphy->dev));
476 
477 	return FAILED;
478 }
479 
sas_eh_abort_handler(struct scsi_cmnd * cmd)480 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
481 {
482 	int res;
483 	struct sas_task *task = TO_SAS_TASK(cmd);
484 	struct Scsi_Host *host = cmd->device->host;
485 	struct sas_internal *i = to_sas_internal(host->transportt);
486 
487 	if (current != host->ehandler)
488 		return FAILED;
489 
490 	if (!i->dft->lldd_abort_task)
491 		return FAILED;
492 
493 	res = i->dft->lldd_abort_task(task);
494 	if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
495 		return SUCCESS;
496 
497 	return FAILED;
498 }
499 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
500 
501 /* Attempt to send a LUN reset message to a device */
sas_eh_device_reset_handler(struct scsi_cmnd * cmd)502 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
503 {
504 	int res;
505 	struct scsi_lun lun;
506 	struct Scsi_Host *host = cmd->device->host;
507 	struct domain_device *dev = cmd_to_domain_dev(cmd);
508 	struct sas_internal *i = to_sas_internal(host->transportt);
509 
510 	if (current != host->ehandler)
511 		return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
512 
513 	int_to_scsilun(cmd->device->lun, &lun);
514 
515 	if (!i->dft->lldd_lu_reset)
516 		return FAILED;
517 
518 	res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
519 	if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
520 		return SUCCESS;
521 
522 	return FAILED;
523 }
524 
sas_eh_bus_reset_handler(struct scsi_cmnd * cmd)525 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
526 {
527 	int res;
528 	struct Scsi_Host *host = cmd->device->host;
529 	struct domain_device *dev = cmd_to_domain_dev(cmd);
530 	struct sas_internal *i = to_sas_internal(host->transportt);
531 
532 	if (current != host->ehandler)
533 		return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
534 
535 	if (!i->dft->lldd_I_T_nexus_reset)
536 		return FAILED;
537 
538 	res = i->dft->lldd_I_T_nexus_reset(dev);
539 	if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
540 	    res == -ENODEV)
541 		return SUCCESS;
542 
543 	return FAILED;
544 }
545 
546 /* Try to reset a device */
try_to_reset_cmd_device(struct scsi_cmnd * cmd)547 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
548 {
549 	int res;
550 	struct Scsi_Host *shost = cmd->device->host;
551 
552 	if (!shost->hostt->eh_device_reset_handler)
553 		goto try_bus_reset;
554 
555 	res = shost->hostt->eh_device_reset_handler(cmd);
556 	if (res == SUCCESS)
557 		return res;
558 
559 try_bus_reset:
560 	if (shost->hostt->eh_bus_reset_handler)
561 		return shost->hostt->eh_bus_reset_handler(cmd);
562 
563 	return FAILED;
564 }
565 
sas_eh_handle_sas_errors(struct Scsi_Host * shost,struct list_head * work_q)566 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
567 {
568 	struct scsi_cmnd *cmd, *n;
569 	enum task_disposition res = TASK_IS_DONE;
570 	int tmf_resp, need_reset;
571 	struct sas_internal *i = to_sas_internal(shost->transportt);
572 	unsigned long flags;
573 	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
574 	LIST_HEAD(done);
575 
576 	/* clean out any commands that won the completion vs eh race */
577 	list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
578 		struct domain_device *dev = cmd_to_domain_dev(cmd);
579 		struct sas_task *task;
580 
581 		spin_lock_irqsave(&dev->done_lock, flags);
582 		/* by this point the lldd has either observed
583 		 * SAS_HA_FROZEN and is leaving the task alone, or has
584 		 * won the race with eh and decided to complete it
585 		 */
586 		task = TO_SAS_TASK(cmd);
587 		spin_unlock_irqrestore(&dev->done_lock, flags);
588 
589 		if (!task)
590 			list_move_tail(&cmd->eh_entry, &done);
591 	}
592 
593  Again:
594 	list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
595 		struct sas_task *task = TO_SAS_TASK(cmd);
596 
597 		list_del_init(&cmd->eh_entry);
598 
599 		spin_lock_irqsave(&task->task_state_lock, flags);
600 		need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
601 		spin_unlock_irqrestore(&task->task_state_lock, flags);
602 
603 		if (need_reset) {
604 			SAS_DPRINTK("%s: task 0x%p requests reset\n",
605 				    __func__, task);
606 			goto reset;
607 		}
608 
609 		SAS_DPRINTK("trying to find task 0x%p\n", task);
610 		res = sas_scsi_find_task(task);
611 
612 		cmd->eh_eflags = 0;
613 
614 		switch (res) {
615 		case TASK_IS_DONE:
616 			SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
617 				    task);
618 			sas_eh_finish_cmd(cmd);
619 			continue;
620 		case TASK_IS_ABORTED:
621 			SAS_DPRINTK("%s: task 0x%p is aborted\n",
622 				    __func__, task);
623 			sas_eh_finish_cmd(cmd);
624 			continue;
625 		case TASK_IS_AT_LU:
626 			SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
627  reset:
628 			tmf_resp = sas_recover_lu(task->dev, cmd);
629 			if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
630 				SAS_DPRINTK("dev %016llx LU %llx is "
631 					    "recovered\n",
632 					    SAS_ADDR(task->dev),
633 					    cmd->device->lun);
634 				sas_eh_finish_cmd(cmd);
635 				sas_scsi_clear_queue_lu(work_q, cmd);
636 				goto Again;
637 			}
638 			/* fallthrough */
639 		case TASK_IS_NOT_AT_LU:
640 		case TASK_ABORT_FAILED:
641 			SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
642 				    task);
643 			tmf_resp = sas_recover_I_T(task->dev);
644 			if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
645 			    tmf_resp == -ENODEV) {
646 				struct domain_device *dev = task->dev;
647 				SAS_DPRINTK("I_T %016llx recovered\n",
648 					    SAS_ADDR(task->dev->sas_addr));
649 				sas_eh_finish_cmd(cmd);
650 				sas_scsi_clear_queue_I_T(work_q, dev);
651 				goto Again;
652 			}
653 			/* Hammer time :-) */
654 			try_to_reset_cmd_device(cmd);
655 			if (i->dft->lldd_clear_nexus_port) {
656 				struct asd_sas_port *port = task->dev->port;
657 				SAS_DPRINTK("clearing nexus for port:%d\n",
658 					    port->id);
659 				res = i->dft->lldd_clear_nexus_port(port);
660 				if (res == TMF_RESP_FUNC_COMPLETE) {
661 					SAS_DPRINTK("clear nexus port:%d "
662 						    "succeeded\n", port->id);
663 					sas_eh_finish_cmd(cmd);
664 					sas_scsi_clear_queue_port(work_q,
665 								  port);
666 					goto Again;
667 				}
668 			}
669 			if (i->dft->lldd_clear_nexus_ha) {
670 				SAS_DPRINTK("clear nexus ha\n");
671 				res = i->dft->lldd_clear_nexus_ha(ha);
672 				if (res == TMF_RESP_FUNC_COMPLETE) {
673 					SAS_DPRINTK("clear nexus ha "
674 						    "succeeded\n");
675 					sas_eh_finish_cmd(cmd);
676 					goto clear_q;
677 				}
678 			}
679 			/* If we are here -- this means that no amount
680 			 * of effort could recover from errors.  Quite
681 			 * possibly the HA just disappeared.
682 			 */
683 			SAS_DPRINTK("error from  device %llx, LUN %llx "
684 				    "couldn't be recovered in any way\n",
685 				    SAS_ADDR(task->dev->sas_addr),
686 				    cmd->device->lun);
687 
688 			sas_eh_finish_cmd(cmd);
689 			goto clear_q;
690 		}
691 	}
692  out:
693 	list_splice_tail(&done, work_q);
694 	list_splice_tail_init(&ha->eh_ata_q, work_q);
695 	return;
696 
697  clear_q:
698 	SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
699 	list_for_each_entry_safe(cmd, n, work_q, eh_entry)
700 		sas_eh_finish_cmd(cmd);
701 	goto out;
702 }
703 
sas_eh_handle_resets(struct Scsi_Host * shost)704 static void sas_eh_handle_resets(struct Scsi_Host *shost)
705 {
706 	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
707 	struct sas_internal *i = to_sas_internal(shost->transportt);
708 
709 	/* handle directed resets to sas devices */
710 	spin_lock_irq(&ha->lock);
711 	while (!list_empty(&ha->eh_dev_q)) {
712 		struct domain_device *dev;
713 		struct ssp_device *ssp;
714 
715 		ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
716 		list_del_init(&ssp->eh_list_node);
717 		dev = container_of(ssp, typeof(*dev), ssp_dev);
718 		kref_get(&dev->kref);
719 		WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
720 
721 		spin_unlock_irq(&ha->lock);
722 
723 		if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
724 			i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
725 
726 		if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
727 			i->dft->lldd_I_T_nexus_reset(dev);
728 
729 		sas_put_device(dev);
730 		spin_lock_irq(&ha->lock);
731 		clear_bit(SAS_DEV_EH_PENDING, &dev->state);
732 		ha->eh_active--;
733 	}
734 	spin_unlock_irq(&ha->lock);
735 }
736 
737 
sas_scsi_recover_host(struct Scsi_Host * shost)738 void sas_scsi_recover_host(struct Scsi_Host *shost)
739 {
740 	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
741 	LIST_HEAD(eh_work_q);
742 	int tries = 0;
743 	bool retry;
744 
745 retry:
746 	tries++;
747 	retry = true;
748 	spin_lock_irq(shost->host_lock);
749 	list_splice_init(&shost->eh_cmd_q, &eh_work_q);
750 	spin_unlock_irq(shost->host_lock);
751 
752 	SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
753 		    __func__, atomic_read(&shost->host_busy), shost->host_failed);
754 	/*
755 	 * Deal with commands that still have SAS tasks (i.e. they didn't
756 	 * complete via the normal sas_task completion mechanism),
757 	 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
758 	 */
759 	set_bit(SAS_HA_FROZEN, &ha->state);
760 	sas_eh_handle_sas_errors(shost, &eh_work_q);
761 	clear_bit(SAS_HA_FROZEN, &ha->state);
762 	if (list_empty(&eh_work_q))
763 		goto out;
764 
765 	/*
766 	 * Now deal with SCSI commands that completed ok but have a an error
767 	 * code (and hopefully sense data) attached.  This is roughly what
768 	 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
769 	 * command we see here has no sas_task and is thus unknown to the HA.
770 	 */
771 	sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
772 	if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
773 		scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
774 
775 out:
776 	sas_eh_handle_resets(shost);
777 
778 	/* now link into libata eh --- if we have any ata devices */
779 	sas_ata_strategy_handler(shost);
780 
781 	scsi_eh_flush_done_q(&ha->eh_done_q);
782 
783 	/* check if any new eh work was scheduled during the last run */
784 	spin_lock_irq(&ha->lock);
785 	if (ha->eh_active == 0) {
786 		shost->host_eh_scheduled = 0;
787 		retry = false;
788 	}
789 	spin_unlock_irq(&ha->lock);
790 
791 	if (retry)
792 		goto retry;
793 
794 	SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
795 		    __func__, atomic_read(&shost->host_busy),
796 		    shost->host_failed, tries);
797 }
798 
sas_scsi_timed_out(struct scsi_cmnd * cmd)799 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
800 {
801 	scmd_dbg(cmd, "command %p timed out\n", cmd);
802 
803 	return BLK_EH_NOT_HANDLED;
804 }
805 
sas_ioctl(struct scsi_device * sdev,int cmd,void __user * arg)806 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
807 {
808 	struct domain_device *dev = sdev_to_domain_dev(sdev);
809 
810 	if (dev_is_sata(dev))
811 		return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
812 
813 	return -EINVAL;
814 }
815 
sas_find_dev_by_rphy(struct sas_rphy * rphy)816 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
817 {
818 	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
819 	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
820 	struct domain_device *found_dev = NULL;
821 	int i;
822 	unsigned long flags;
823 
824 	spin_lock_irqsave(&ha->phy_port_lock, flags);
825 	for (i = 0; i < ha->num_phys; i++) {
826 		struct asd_sas_port *port = ha->sas_port[i];
827 		struct domain_device *dev;
828 
829 		spin_lock(&port->dev_list_lock);
830 		list_for_each_entry(dev, &port->dev_list, dev_list_node) {
831 			if (rphy == dev->rphy) {
832 				found_dev = dev;
833 				spin_unlock(&port->dev_list_lock);
834 				goto found;
835 			}
836 		}
837 		spin_unlock(&port->dev_list_lock);
838 	}
839  found:
840 	spin_unlock_irqrestore(&ha->phy_port_lock, flags);
841 
842 	return found_dev;
843 }
844 
sas_target_alloc(struct scsi_target * starget)845 int sas_target_alloc(struct scsi_target *starget)
846 {
847 	struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
848 	struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
849 
850 	if (!found_dev)
851 		return -ENODEV;
852 
853 	kref_get(&found_dev->kref);
854 	starget->hostdata = found_dev;
855 	return 0;
856 }
857 
858 #define SAS_DEF_QD 256
859 
sas_slave_configure(struct scsi_device * scsi_dev)860 int sas_slave_configure(struct scsi_device *scsi_dev)
861 {
862 	struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
863 	struct sas_ha_struct *sas_ha;
864 
865 	BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
866 
867 	if (dev_is_sata(dev)) {
868 		ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
869 		return 0;
870 	}
871 
872 	sas_ha = dev->port->ha;
873 
874 	sas_read_port_mode_page(scsi_dev);
875 
876 	if (scsi_dev->tagged_supported) {
877 		scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
878 	} else {
879 		SAS_DPRINTK("device %llx, LUN %llx doesn't support "
880 			    "TCQ\n", SAS_ADDR(dev->sas_addr),
881 			    scsi_dev->lun);
882 		scsi_change_queue_depth(scsi_dev, 1);
883 	}
884 
885 	scsi_dev->allow_restart = 1;
886 
887 	return 0;
888 }
889 
sas_change_queue_depth(struct scsi_device * sdev,int depth)890 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
891 {
892 	struct domain_device *dev = sdev_to_domain_dev(sdev);
893 
894 	if (dev_is_sata(dev))
895 		return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
896 
897 	if (!sdev->tagged_supported)
898 		depth = 1;
899 	return scsi_change_queue_depth(sdev, depth);
900 }
901 
sas_bios_param(struct scsi_device * scsi_dev,struct block_device * bdev,sector_t capacity,int * hsc)902 int sas_bios_param(struct scsi_device *scsi_dev,
903 			  struct block_device *bdev,
904 			  sector_t capacity, int *hsc)
905 {
906 	hsc[0] = 255;
907 	hsc[1] = 63;
908 	sector_div(capacity, 255*63);
909 	hsc[2] = capacity;
910 
911 	return 0;
912 }
913 
914 /*
915  * Tell an upper layer that it needs to initiate an abort for a given task.
916  * This should only ever be called by an LLDD.
917  */
sas_task_abort(struct sas_task * task)918 void sas_task_abort(struct sas_task *task)
919 {
920 	struct scsi_cmnd *sc = task->uldd_task;
921 
922 	/* Escape for libsas internal commands */
923 	if (!sc) {
924 		struct sas_task_slow *slow = task->slow_task;
925 
926 		if (!slow)
927 			return;
928 		if (!del_timer(&slow->timer))
929 			return;
930 		slow->timer.function(slow->timer.data);
931 		return;
932 	}
933 
934 	if (dev_is_sata(task->dev)) {
935 		sas_ata_task_abort(task);
936 	} else {
937 		struct request_queue *q = sc->device->request_queue;
938 		unsigned long flags;
939 
940 		spin_lock_irqsave(q->queue_lock, flags);
941 		blk_abort_request(sc->request);
942 		spin_unlock_irqrestore(q->queue_lock, flags);
943 	}
944 }
945 
sas_target_destroy(struct scsi_target * starget)946 void sas_target_destroy(struct scsi_target *starget)
947 {
948 	struct domain_device *found_dev = starget->hostdata;
949 
950 	if (!found_dev)
951 		return;
952 
953 	starget->hostdata = NULL;
954 	sas_put_device(found_dev);
955 }
956 
sas_parse_addr(u8 * sas_addr,const char * p)957 static void sas_parse_addr(u8 *sas_addr, const char *p)
958 {
959 	int i;
960 	for (i = 0; i < SAS_ADDR_SIZE; i++) {
961 		u8 h, l;
962 		if (!*p)
963 			break;
964 		h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
965 		p++;
966 		l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
967 		p++;
968 		sas_addr[i] = (h<<4) | l;
969 	}
970 }
971 
972 #define SAS_STRING_ADDR_SIZE	16
973 
sas_request_addr(struct Scsi_Host * shost,u8 * addr)974 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
975 {
976 	int res;
977 	const struct firmware *fw;
978 
979 	res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
980 	if (res)
981 		return res;
982 
983 	if (fw->size < SAS_STRING_ADDR_SIZE) {
984 		res = -ENODEV;
985 		goto out;
986 	}
987 
988 	sas_parse_addr(addr, fw->data);
989 
990 out:
991 	release_firmware(fw);
992 	return res;
993 }
994 EXPORT_SYMBOL_GPL(sas_request_addr);
995 
996 EXPORT_SYMBOL_GPL(sas_queuecommand);
997 EXPORT_SYMBOL_GPL(sas_target_alloc);
998 EXPORT_SYMBOL_GPL(sas_slave_configure);
999 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1000 EXPORT_SYMBOL_GPL(sas_bios_param);
1001 EXPORT_SYMBOL_GPL(sas_task_abort);
1002 EXPORT_SYMBOL_GPL(sas_phy_reset);
1003 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1004 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1005 EXPORT_SYMBOL_GPL(sas_target_destroy);
1006 EXPORT_SYMBOL_GPL(sas_ioctl);
1007