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1/*
2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
3 *
4 * Copyright (C) 2006 IBM Corporation
5 *
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 */
23
24#include <linux/scatterlist.h>
25#include <linux/slab.h>
26#include <linux/async.h>
27#include <linux/export.h>
28
29#include <scsi/sas_ata.h>
30#include "sas_internal.h"
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_tcq.h>
34#include <scsi/scsi.h>
35#include <scsi/scsi_transport.h>
36#include <scsi/scsi_transport_sas.h>
37#include "../scsi_sas_internal.h"
38#include "../scsi_transport_api.h"
39#include <scsi/scsi_eh.h>
40
41static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
42{
43 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
44
45 /* transport error */
46 if (ts->resp == SAS_TASK_UNDELIVERED)
47 return AC_ERR_ATA_BUS;
48
49 /* ts->resp == SAS_TASK_COMPLETE */
50 /* task delivered, what happened afterwards? */
51 switch (ts->stat) {
52 case SAS_DEV_NO_RESPONSE:
53 return AC_ERR_TIMEOUT;
54
55 case SAS_INTERRUPTED:
56 case SAS_PHY_DOWN:
57 case SAS_NAK_R_ERR:
58 return AC_ERR_ATA_BUS;
59
60
61 case SAS_DATA_UNDERRUN:
62 /*
63 * Some programs that use the taskfile interface
64 * (smartctl in particular) can cause underrun
65 * problems. Ignore these errors, perhaps at our
66 * peril.
67 */
68 return 0;
69
70 case SAS_DATA_OVERRUN:
71 case SAS_QUEUE_FULL:
72 case SAS_DEVICE_UNKNOWN:
73 case SAS_SG_ERR:
74 return AC_ERR_INVALID;
75
76 case SAS_OPEN_TO:
77 case SAS_OPEN_REJECT:
78 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
79 __func__, ts->stat);
80 return AC_ERR_OTHER;
81
82 case SAM_STAT_CHECK_CONDITION:
83 case SAS_ABORTED_TASK:
84 return AC_ERR_DEV;
85
86 case SAS_PROTO_RESPONSE:
87 /* This means the ending_fis has the error
88 * value; return 0 here to collect it */
89 return 0;
90 default:
91 return 0;
92 }
93}
94
95static void sas_ata_task_done(struct sas_task *task)
96{
97 struct ata_queued_cmd *qc = task->uldd_task;
98 struct domain_device *dev = task->dev;
99 struct task_status_struct *stat = &task->task_status;
100 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
101 struct sas_ha_struct *sas_ha = dev->port->ha;
102 enum ata_completion_errors ac;
103 unsigned long flags;
104 struct ata_link *link;
105 struct ata_port *ap;
106
107 spin_lock_irqsave(&dev->done_lock, flags);
108 if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
109 task = NULL;
110 else if (qc && qc->scsicmd)
111 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
112 spin_unlock_irqrestore(&dev->done_lock, flags);
113
114 /* check if libsas-eh got to the task before us */
115 if (unlikely(!task))
116 return;
117
118 if (!qc)
119 goto qc_already_gone;
120
121 ap = qc->ap;
122 link = &ap->link;
123
124 spin_lock_irqsave(ap->lock, flags);
125 /* check if we lost the race with libata/sas_ata_post_internal() */
126 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
127 spin_unlock_irqrestore(ap->lock, flags);
128 if (qc->scsicmd)
129 goto qc_already_gone;
130 else {
131 /* if eh is not involved and the port is frozen then the
132 * ata internal abort process has taken responsibility
133 * for this sas_task
134 */
135 return;
136 }
137 }
138
139 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
140 ((stat->stat == SAM_STAT_CHECK_CONDITION &&
141 dev->sata_dev.class == ATA_DEV_ATAPI))) {
142 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
143
144 if (!link->sactive) {
145 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
146 } else {
147 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
148 if (unlikely(link->eh_info.err_mask))
149 qc->flags |= ATA_QCFLAG_FAILED;
150 }
151 } else {
152 ac = sas_to_ata_err(stat);
153 if (ac) {
154 SAS_DPRINTK("%s: SAS error %x\n", __func__,
155 stat->stat);
156 /* We saw a SAS error. Send a vague error. */
157 if (!link->sactive) {
158 qc->err_mask = ac;
159 } else {
160 link->eh_info.err_mask |= AC_ERR_DEV;
161 qc->flags |= ATA_QCFLAG_FAILED;
162 }
163
164 dev->sata_dev.fis[3] = 0x04; /* status err */
165 dev->sata_dev.fis[2] = ATA_ERR;
166 }
167 }
168
169 qc->lldd_task = NULL;
170 ata_qc_complete(qc);
171 spin_unlock_irqrestore(ap->lock, flags);
172
173qc_already_gone:
174 sas_free_task(task);
175}
176
177static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
178{
179 unsigned long flags;
180 struct sas_task *task;
181 struct scatterlist *sg;
182 int ret = AC_ERR_SYSTEM;
183 unsigned int si, xfer = 0;
184 struct ata_port *ap = qc->ap;
185 struct domain_device *dev = ap->private_data;
186 struct sas_ha_struct *sas_ha = dev->port->ha;
187 struct Scsi_Host *host = sas_ha->core.shost;
188 struct sas_internal *i = to_sas_internal(host->transportt);
189
190 /* TODO: audit callers to ensure they are ready for qc_issue to
191 * unconditionally re-enable interrupts
192 */
193 local_irq_save(flags);
194 spin_unlock(ap->lock);
195
196 /* If the device fell off, no sense in issuing commands */
197 if (test_bit(SAS_DEV_GONE, &dev->state))
198 goto out;
199
200 task = sas_alloc_task(GFP_ATOMIC);
201 if (!task)
202 goto out;
203 task->dev = dev;
204 task->task_proto = SAS_PROTOCOL_STP;
205 task->task_done = sas_ata_task_done;
206
207 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
208 qc->tf.command == ATA_CMD_FPDMA_READ ||
209 qc->tf.command == ATA_CMD_FPDMA_RECV ||
210 qc->tf.command == ATA_CMD_FPDMA_SEND ||
211 qc->tf.command == ATA_CMD_NCQ_NON_DATA) {
212 /* Need to zero out the tag libata assigned us */
213 qc->tf.nsect = 0;
214 }
215
216 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
217 task->uldd_task = qc;
218 if (ata_is_atapi(qc->tf.protocol)) {
219 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
220 task->total_xfer_len = qc->nbytes;
221 task->num_scatter = qc->n_elem;
222 } else {
223 for_each_sg(qc->sg, sg, qc->n_elem, si)
224 xfer += sg_dma_len(sg);
225
226 task->total_xfer_len = xfer;
227 task->num_scatter = si;
228 }
229
230 task->data_dir = qc->dma_dir;
231 task->scatter = qc->sg;
232 task->ata_task.retry_count = 1;
233 task->task_state_flags = SAS_TASK_STATE_PENDING;
234 qc->lldd_task = task;
235
236 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
237 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
238
239 if (qc->scsicmd)
240 ASSIGN_SAS_TASK(qc->scsicmd, task);
241
242 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
243 if (ret) {
244 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret);
245
246 if (qc->scsicmd)
247 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
248 sas_free_task(task);
249 qc->lldd_task = NULL;
250 ret = AC_ERR_SYSTEM;
251 }
252
253 out:
254 spin_lock(ap->lock);
255 local_irq_restore(flags);
256 return ret;
257}
258
259static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
260{
261 struct domain_device *dev = qc->ap->private_data;
262
263 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
264 return true;
265}
266
267static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
268{
269 return to_sas_internal(dev->port->ha->core.shost->transportt);
270}
271
272static int sas_get_ata_command_set(struct domain_device *dev);
273
274int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
275{
276 if (phy->attached_tproto & SAS_PROTOCOL_STP)
277 dev->tproto = phy->attached_tproto;
278 if (phy->attached_sata_dev)
279 dev->tproto |= SAS_SATA_DEV;
280
281 if (phy->attached_dev_type == SAS_SATA_PENDING)
282 dev->dev_type = SAS_SATA_PENDING;
283 else {
284 int res;
285
286 dev->dev_type = SAS_SATA_DEV;
287 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
288 &dev->sata_dev.rps_resp);
289 if (res) {
290 SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
291 "0x%x\n", SAS_ADDR(dev->parent->sas_addr),
292 phy->phy_id, res);
293 return res;
294 }
295 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
296 sizeof(struct dev_to_host_fis));
297 dev->sata_dev.class = sas_get_ata_command_set(dev);
298 }
299 return 0;
300}
301
302static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
303{
304 int res;
305
306 /* we weren't pending, so successfully end the reset sequence now */
307 if (dev->dev_type != SAS_SATA_PENDING)
308 return 1;
309
310 /* hmmm, if this succeeds do we need to repost the domain_device to the
311 * lldd so it can pick up new parameters?
312 */
313 res = sas_get_ata_info(dev, phy);
314 if (res)
315 return 0; /* retry */
316 else
317 return 1;
318}
319
320static int smp_ata_check_ready(struct ata_link *link)
321{
322 int res;
323 struct ata_port *ap = link->ap;
324 struct domain_device *dev = ap->private_data;
325 struct domain_device *ex_dev = dev->parent;
326 struct sas_phy *phy = sas_get_local_phy(dev);
327 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
328
329 res = sas_ex_phy_discover(ex_dev, phy->number);
330 sas_put_local_phy(phy);
331
332 /* break the wait early if the expander is unreachable,
333 * otherwise keep polling
334 */
335 if (res == -ECOMM)
336 return res;
337 if (res != SMP_RESP_FUNC_ACC)
338 return 0;
339
340 switch (ex_phy->attached_dev_type) {
341 case SAS_SATA_PENDING:
342 return 0;
343 case SAS_END_DEVICE:
344 if (ex_phy->attached_sata_dev)
345 return sas_ata_clear_pending(dev, ex_phy);
346 default:
347 return -ENODEV;
348 }
349}
350
351static int local_ata_check_ready(struct ata_link *link)
352{
353 struct ata_port *ap = link->ap;
354 struct domain_device *dev = ap->private_data;
355 struct sas_internal *i = dev_to_sas_internal(dev);
356
357 if (i->dft->lldd_ata_check_ready)
358 return i->dft->lldd_ata_check_ready(dev);
359 else {
360 /* lldd's that don't implement 'ready' checking get the
361 * old default behavior of not coordinating reset
362 * recovery with libata
363 */
364 return 1;
365 }
366}
367
368static int sas_ata_printk(const char *level, const struct domain_device *ddev,
369 const char *fmt, ...)
370{
371 struct ata_port *ap = ddev->sata_dev.ap;
372 struct device *dev = &ddev->rphy->dev;
373 struct va_format vaf;
374 va_list args;
375 int r;
376
377 va_start(args, fmt);
378
379 vaf.fmt = fmt;
380 vaf.va = &args;
381
382 r = printk("%ssas: ata%u: %s: %pV",
383 level, ap->print_id, dev_name(dev), &vaf);
384
385 va_end(args);
386
387 return r;
388}
389
390static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
391 unsigned long deadline)
392{
393 int ret = 0, res;
394 struct sas_phy *phy;
395 struct ata_port *ap = link->ap;
396 int (*check_ready)(struct ata_link *link);
397 struct domain_device *dev = ap->private_data;
398 struct sas_internal *i = dev_to_sas_internal(dev);
399
400 res = i->dft->lldd_I_T_nexus_reset(dev);
401 if (res == -ENODEV)
402 return res;
403
404 if (res != TMF_RESP_FUNC_COMPLETE)
405 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
406
407 phy = sas_get_local_phy(dev);
408 if (scsi_is_sas_phy_local(phy))
409 check_ready = local_ata_check_ready;
410 else
411 check_ready = smp_ata_check_ready;
412 sas_put_local_phy(phy);
413
414 ret = ata_wait_after_reset(link, deadline, check_ready);
415 if (ret && ret != -EAGAIN)
416 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
417
418 *class = dev->sata_dev.class;
419
420 ap->cbl = ATA_CBL_SATA;
421 return ret;
422}
423
424/*
425 * notify the lldd to forget the sas_task for this internal ata command
426 * that bypasses scsi-eh
427 */
428static void sas_ata_internal_abort(struct sas_task *task)
429{
430 struct sas_internal *si = dev_to_sas_internal(task->dev);
431 unsigned long flags;
432 int res;
433
434 spin_lock_irqsave(&task->task_state_lock, flags);
435 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
436 task->task_state_flags & SAS_TASK_STATE_DONE) {
437 spin_unlock_irqrestore(&task->task_state_lock, flags);
438 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
439 task);
440 goto out;
441 }
442 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
443 spin_unlock_irqrestore(&task->task_state_lock, flags);
444
445 res = si->dft->lldd_abort_task(task);
446
447 spin_lock_irqsave(&task->task_state_lock, flags);
448 if (task->task_state_flags & SAS_TASK_STATE_DONE ||
449 res == TMF_RESP_FUNC_COMPLETE) {
450 spin_unlock_irqrestore(&task->task_state_lock, flags);
451 goto out;
452 }
453
454 /* XXX we are not prepared to deal with ->lldd_abort_task()
455 * failures. TODO: lldds need to unconditionally forget about
456 * aborted ata tasks, otherwise we (likely) leak the sas task
457 * here
458 */
459 SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task);
460
461 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
462 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
463 spin_unlock_irqrestore(&task->task_state_lock, flags);
464
465 return;
466 out:
467 sas_free_task(task);
468}
469
470static void sas_ata_post_internal(struct ata_queued_cmd *qc)
471{
472 if (qc->flags & ATA_QCFLAG_FAILED)
473 qc->err_mask |= AC_ERR_OTHER;
474
475 if (qc->err_mask) {
476 /*
477 * Find the sas_task and kill it. By this point, libata
478 * has decided to kill the qc and has frozen the port.
479 * In this state sas_ata_task_done() will no longer free
480 * the sas_task, so we need to notify the lldd (via
481 * ->lldd_abort_task) that the task is dead and free it
482 * ourselves.
483 */
484 struct sas_task *task = qc->lldd_task;
485
486 qc->lldd_task = NULL;
487 if (!task)
488 return;
489 task->uldd_task = NULL;
490 sas_ata_internal_abort(task);
491 }
492}
493
494
495static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
496{
497 struct domain_device *dev = ap->private_data;
498 struct sas_internal *i = dev_to_sas_internal(dev);
499
500 if (i->dft->lldd_ata_set_dmamode)
501 i->dft->lldd_ata_set_dmamode(dev);
502}
503
504static void sas_ata_sched_eh(struct ata_port *ap)
505{
506 struct domain_device *dev = ap->private_data;
507 struct sas_ha_struct *ha = dev->port->ha;
508 unsigned long flags;
509
510 spin_lock_irqsave(&ha->lock, flags);
511 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
512 ha->eh_active++;
513 ata_std_sched_eh(ap);
514 spin_unlock_irqrestore(&ha->lock, flags);
515}
516
517void sas_ata_end_eh(struct ata_port *ap)
518{
519 struct domain_device *dev = ap->private_data;
520 struct sas_ha_struct *ha = dev->port->ha;
521 unsigned long flags;
522
523 spin_lock_irqsave(&ha->lock, flags);
524 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
525 ha->eh_active--;
526 spin_unlock_irqrestore(&ha->lock, flags);
527}
528
529static struct ata_port_operations sas_sata_ops = {
530 .prereset = ata_std_prereset,
531 .hardreset = sas_ata_hard_reset,
532 .postreset = ata_std_postreset,
533 .error_handler = ata_std_error_handler,
534 .post_internal_cmd = sas_ata_post_internal,
535 .qc_defer = ata_std_qc_defer,
536 .qc_prep = ata_noop_qc_prep,
537 .qc_issue = sas_ata_qc_issue,
538 .qc_fill_rtf = sas_ata_qc_fill_rtf,
539 .port_start = ata_sas_port_start,
540 .port_stop = ata_sas_port_stop,
541 .set_dmamode = sas_ata_set_dmamode,
542 .sched_eh = sas_ata_sched_eh,
543 .end_eh = sas_ata_end_eh,
544};
545
546static struct ata_port_info sata_port_info = {
547 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
548 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
549 .pio_mask = ATA_PIO4,
550 .mwdma_mask = ATA_MWDMA2,
551 .udma_mask = ATA_UDMA6,
552 .port_ops = &sas_sata_ops
553};
554
555int sas_ata_init(struct domain_device *found_dev)
556{
557 struct sas_ha_struct *ha = found_dev->port->ha;
558 struct Scsi_Host *shost = ha->core.shost;
559 struct ata_port *ap;
560 int rc;
561
562 ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops);
563 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
564 &sata_port_info,
565 shost);
566 if (!ap) {
567 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
568 return -ENODEV;
569 }
570
571 ap->private_data = found_dev;
572 ap->cbl = ATA_CBL_SATA;
573 ap->scsi_host = shost;
574 rc = ata_sas_port_init(ap);
575 if (rc) {
576 ata_sas_port_destroy(ap);
577 return rc;
578 }
579 found_dev->sata_dev.ap = ap;
580
581 return 0;
582}
583
584void sas_ata_task_abort(struct sas_task *task)
585{
586 struct ata_queued_cmd *qc = task->uldd_task;
587 struct completion *waiting;
588
589 /* Bounce SCSI-initiated commands to the SCSI EH */
590 if (qc->scsicmd) {
591 struct request_queue *q = qc->scsicmd->device->request_queue;
592 unsigned long flags;
593
594 spin_lock_irqsave(q->queue_lock, flags);
595 blk_abort_request(qc->scsicmd->request);
596 spin_unlock_irqrestore(q->queue_lock, flags);
597 return;
598 }
599
600 /* Internal command, fake a timeout and complete. */
601 qc->flags &= ~ATA_QCFLAG_ACTIVE;
602 qc->flags |= ATA_QCFLAG_FAILED;
603 qc->err_mask |= AC_ERR_TIMEOUT;
604 waiting = qc->private_data;
605 complete(waiting);
606}
607
608static int sas_get_ata_command_set(struct domain_device *dev)
609{
610 struct dev_to_host_fis *fis =
611 (struct dev_to_host_fis *) dev->frame_rcvd;
612 struct ata_taskfile tf;
613
614 if (dev->dev_type == SAS_SATA_PENDING)
615 return ATA_DEV_UNKNOWN;
616
617 ata_tf_from_fis((const u8 *)fis, &tf);
618
619 return ata_dev_classify(&tf);
620}
621
622void sas_probe_sata(struct asd_sas_port *port)
623{
624 struct domain_device *dev, *n;
625
626 mutex_lock(&port->ha->disco_mutex);
627 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
628 if (!dev_is_sata(dev))
629 continue;
630
631 ata_sas_async_probe(dev->sata_dev.ap);
632 }
633 mutex_unlock(&port->ha->disco_mutex);
634
635 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
636 if (!dev_is_sata(dev))
637 continue;
638
639 sas_ata_wait_eh(dev);
640
641 /* if libata could not bring the link up, don't surface
642 * the device
643 */
644 if (ata_dev_disabled(sas_to_ata_dev(dev)))
645 sas_fail_probe(dev, __func__, -ENODEV);
646 }
647
648}
649
650static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
651{
652 struct domain_device *dev, *n;
653
654 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
655 if (!dev_is_sata(dev))
656 continue;
657
658 sas_ata_wait_eh(dev);
659
660 /* if libata failed to power manage the device, tear it down */
661 if (ata_dev_disabled(sas_to_ata_dev(dev)))
662 sas_fail_probe(dev, func, -ENODEV);
663 }
664}
665
666void sas_suspend_sata(struct asd_sas_port *port)
667{
668 struct domain_device *dev;
669
670 mutex_lock(&port->ha->disco_mutex);
671 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
672 struct sata_device *sata;
673
674 if (!dev_is_sata(dev))
675 continue;
676
677 sata = &dev->sata_dev;
678 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
679 continue;
680
681 ata_sas_port_suspend(sata->ap);
682 }
683 mutex_unlock(&port->ha->disco_mutex);
684
685 sas_ata_flush_pm_eh(port, __func__);
686}
687
688void sas_resume_sata(struct asd_sas_port *port)
689{
690 struct domain_device *dev;
691
692 mutex_lock(&port->ha->disco_mutex);
693 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
694 struct sata_device *sata;
695
696 if (!dev_is_sata(dev))
697 continue;
698
699 sata = &dev->sata_dev;
700 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
701 continue;
702
703 ata_sas_port_resume(sata->ap);
704 }
705 mutex_unlock(&port->ha->disco_mutex);
706
707 sas_ata_flush_pm_eh(port, __func__);
708}
709
710/**
711 * sas_discover_sata -- discover an STP/SATA domain device
712 * @dev: pointer to struct domain_device of interest
713 *
714 * Devices directly attached to a HA port, have no parents. All other
715 * devices do, and should have their "parent" pointer set appropriately
716 * before calling this function.
717 */
718int sas_discover_sata(struct domain_device *dev)
719{
720 int res;
721
722 if (dev->dev_type == SAS_SATA_PM)
723 return -ENODEV;
724
725 dev->sata_dev.class = sas_get_ata_command_set(dev);
726 sas_fill_in_rphy(dev, dev->rphy);
727
728 res = sas_notify_lldd_dev_found(dev);
729 if (res)
730 return res;
731
732 sas_discover_event(dev->port, DISCE_PROBE);
733 return 0;
734}
735
736static void async_sas_ata_eh(void *data, async_cookie_t cookie)
737{
738 struct domain_device *dev = data;
739 struct ata_port *ap = dev->sata_dev.ap;
740 struct sas_ha_struct *ha = dev->port->ha;
741
742 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
743 ata_scsi_port_error_handler(ha->core.shost, ap);
744 sas_put_device(dev);
745}
746
747void sas_ata_strategy_handler(struct Scsi_Host *shost)
748{
749 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
750 ASYNC_DOMAIN_EXCLUSIVE(async);
751 int i;
752
753 /* it's ok to defer revalidation events during ata eh, these
754 * disks are in one of three states:
755 * 1/ present for initial domain discovery, and these
756 * resets will cause bcn flutters
757 * 2/ hot removed, we'll discover that after eh fails
758 * 3/ hot added after initial discovery, lost the race, and need
759 * to catch the next train.
760 */
761 sas_disable_revalidation(sas_ha);
762
763 spin_lock_irq(&sas_ha->phy_port_lock);
764 for (i = 0; i < sas_ha->num_phys; i++) {
765 struct asd_sas_port *port = sas_ha->sas_port[i];
766 struct domain_device *dev;
767
768 spin_lock(&port->dev_list_lock);
769 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
770 if (!dev_is_sata(dev))
771 continue;
772
773 /* hold a reference over eh since we may be
774 * racing with final remove once all commands
775 * are completed
776 */
777 kref_get(&dev->kref);
778
779 async_schedule_domain(async_sas_ata_eh, dev, &async);
780 }
781 spin_unlock(&port->dev_list_lock);
782 }
783 spin_unlock_irq(&sas_ha->phy_port_lock);
784
785 async_synchronize_full_domain(&async);
786
787 sas_enable_revalidation(sas_ha);
788}
789
790void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
791 struct list_head *done_q)
792{
793 struct scsi_cmnd *cmd, *n;
794 struct domain_device *eh_dev;
795
796 do {
797 LIST_HEAD(sata_q);
798 eh_dev = NULL;
799
800 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
801 struct domain_device *ddev = cmd_to_domain_dev(cmd);
802
803 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
804 continue;
805 if (eh_dev && eh_dev != ddev)
806 continue;
807 eh_dev = ddev;
808 list_move(&cmd->eh_entry, &sata_q);
809 }
810
811 if (!list_empty(&sata_q)) {
812 struct ata_port *ap = eh_dev->sata_dev.ap;
813
814 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
815 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
816 /*
817 * ata's error handler may leave the cmd on the list
818 * so make sure they don't remain on a stack list
819 * about to go out of scope.
820 *
821 * This looks strange, since the commands are
822 * now part of no list, but the next error
823 * action will be ata_port_error_handler()
824 * which takes no list and sweeps them up
825 * anyway from the ata tag array.
826 */
827 while (!list_empty(&sata_q))
828 list_del_init(sata_q.next);
829 }
830 } while (eh_dev);
831}
832
833void sas_ata_schedule_reset(struct domain_device *dev)
834{
835 struct ata_eh_info *ehi;
836 struct ata_port *ap;
837 unsigned long flags;
838
839 if (!dev_is_sata(dev))
840 return;
841
842 ap = dev->sata_dev.ap;
843 ehi = &ap->link.eh_info;
844
845 spin_lock_irqsave(ap->lock, flags);
846 ehi->err_mask |= AC_ERR_TIMEOUT;
847 ehi->action |= ATA_EH_RESET;
848 ata_port_schedule_eh(ap);
849 spin_unlock_irqrestore(ap->lock, flags);
850}
851EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
852
853void sas_ata_wait_eh(struct domain_device *dev)
854{
855 struct ata_port *ap;
856
857 if (!dev_is_sata(dev))
858 return;
859
860 ap = dev->sata_dev.ap;
861 ata_port_wait_eh(ap);
862}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
4 *
5 * Copyright (C) 2006 IBM Corporation
6 *
7 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
8 */
9
10#include <linux/scatterlist.h>
11#include <linux/slab.h>
12#include <linux/async.h>
13#include <linux/export.h>
14
15#include <scsi/sas_ata.h>
16#include "sas_internal.h"
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_tcq.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_transport.h>
22#include <scsi/scsi_transport_sas.h>
23#include "scsi_sas_internal.h"
24#include "scsi_transport_api.h"
25#include <scsi/scsi_eh.h>
26
27static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
28{
29 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
30
31 /* transport error */
32 if (ts->resp == SAS_TASK_UNDELIVERED)
33 return AC_ERR_ATA_BUS;
34
35 /* ts->resp == SAS_TASK_COMPLETE */
36 /* task delivered, what happened afterwards? */
37 switch (ts->stat) {
38 case SAS_DEV_NO_RESPONSE:
39 return AC_ERR_TIMEOUT;
40 case SAS_INTERRUPTED:
41 case SAS_PHY_DOWN:
42 case SAS_NAK_R_ERR:
43 return AC_ERR_ATA_BUS;
44 case SAS_DATA_UNDERRUN:
45 /*
46 * Some programs that use the taskfile interface
47 * (smartctl in particular) can cause underrun
48 * problems. Ignore these errors, perhaps at our
49 * peril.
50 */
51 return 0;
52 case SAS_DATA_OVERRUN:
53 case SAS_QUEUE_FULL:
54 case SAS_DEVICE_UNKNOWN:
55 case SAS_OPEN_TO:
56 case SAS_OPEN_REJECT:
57 pr_warn("%s: Saw error %d. What to do?\n",
58 __func__, ts->stat);
59 return AC_ERR_OTHER;
60 case SAM_STAT_CHECK_CONDITION:
61 case SAS_ABORTED_TASK:
62 return AC_ERR_DEV;
63 case SAS_PROTO_RESPONSE:
64 /* This means the ending_fis has the error
65 * value; return 0 here to collect it
66 */
67 return 0;
68 default:
69 return 0;
70 }
71}
72
73static void sas_ata_task_done(struct sas_task *task)
74{
75 struct ata_queued_cmd *qc = task->uldd_task;
76 struct domain_device *dev = task->dev;
77 struct task_status_struct *stat = &task->task_status;
78 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
79 struct sas_ha_struct *sas_ha = dev->port->ha;
80 enum ata_completion_errors ac;
81 unsigned long flags;
82 struct ata_link *link;
83 struct ata_port *ap;
84
85 spin_lock_irqsave(&dev->done_lock, flags);
86 if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
87 task = NULL;
88 else if (qc && qc->scsicmd)
89 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
90 spin_unlock_irqrestore(&dev->done_lock, flags);
91
92 /* check if libsas-eh got to the task before us */
93 if (unlikely(!task))
94 return;
95
96 if (!qc)
97 goto qc_already_gone;
98
99 ap = qc->ap;
100 link = &ap->link;
101
102 spin_lock_irqsave(ap->lock, flags);
103 /* check if we lost the race with libata/sas_ata_post_internal() */
104 if (unlikely(ata_port_is_frozen(ap))) {
105 spin_unlock_irqrestore(ap->lock, flags);
106 if (qc->scsicmd)
107 goto qc_already_gone;
108 else {
109 /* if eh is not involved and the port is frozen then the
110 * ata internal abort process has taken responsibility
111 * for this sas_task
112 */
113 return;
114 }
115 }
116
117 if (stat->stat == SAS_PROTO_RESPONSE ||
118 stat->stat == SAS_SAM_STAT_GOOD ||
119 (stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
120 dev->sata_dev.class == ATA_DEV_ATAPI)) {
121 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
122
123 if (!link->sactive) {
124 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
125 } else {
126 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
127 if (unlikely(link->eh_info.err_mask))
128 qc->flags |= ATA_QCFLAG_FAILED;
129 }
130 } else {
131 ac = sas_to_ata_err(stat);
132 if (ac) {
133 pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
134 /* We saw a SAS error. Send a vague error. */
135 if (!link->sactive) {
136 qc->err_mask = ac;
137 } else {
138 link->eh_info.err_mask |= AC_ERR_DEV;
139 qc->flags |= ATA_QCFLAG_FAILED;
140 }
141
142 dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
143 dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
144 }
145 }
146
147 qc->lldd_task = NULL;
148 ata_qc_complete(qc);
149 spin_unlock_irqrestore(ap->lock, flags);
150
151qc_already_gone:
152 sas_free_task(task);
153}
154
155static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
156 __must_hold(ap->lock)
157{
158 struct sas_task *task;
159 struct scatterlist *sg;
160 int ret = AC_ERR_SYSTEM;
161 unsigned int si, xfer = 0;
162 struct ata_port *ap = qc->ap;
163 struct domain_device *dev = ap->private_data;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *host = sas_ha->core.shost;
166 struct sas_internal *i = to_sas_internal(host->transportt);
167
168 /* TODO: we should try to remove that unlock */
169 spin_unlock(ap->lock);
170
171 /* If the device fell off, no sense in issuing commands */
172 if (test_bit(SAS_DEV_GONE, &dev->state))
173 goto out;
174
175 task = sas_alloc_task(GFP_ATOMIC);
176 if (!task)
177 goto out;
178 task->dev = dev;
179 task->task_proto = SAS_PROTOCOL_STP;
180 task->task_done = sas_ata_task_done;
181
182 /* For NCQ commands, zero out the tag libata assigned us */
183 if (ata_is_ncq(qc->tf.protocol))
184 qc->tf.nsect = 0;
185
186 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
187 task->uldd_task = qc;
188 if (ata_is_atapi(qc->tf.protocol)) {
189 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
190 task->total_xfer_len = qc->nbytes;
191 task->num_scatter = qc->n_elem;
192 task->data_dir = qc->dma_dir;
193 } else if (!ata_is_data(qc->tf.protocol)) {
194 task->data_dir = DMA_NONE;
195 } else {
196 for_each_sg(qc->sg, sg, qc->n_elem, si)
197 xfer += sg_dma_len(sg);
198
199 task->total_xfer_len = xfer;
200 task->num_scatter = si;
201 task->data_dir = qc->dma_dir;
202 }
203 task->scatter = qc->sg;
204 task->ata_task.retry_count = 1;
205 qc->lldd_task = task;
206
207 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
208 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
209
210 if (qc->scsicmd)
211 ASSIGN_SAS_TASK(qc->scsicmd, task);
212
213 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
214 if (ret) {
215 pr_debug("lldd_execute_task returned: %d\n", ret);
216
217 if (qc->scsicmd)
218 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
219 sas_free_task(task);
220 qc->lldd_task = NULL;
221 ret = AC_ERR_SYSTEM;
222 }
223
224 out:
225 spin_lock(ap->lock);
226 return ret;
227}
228
229static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
230{
231 struct domain_device *dev = qc->ap->private_data;
232
233 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
234 return true;
235}
236
237static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
238{
239 return to_sas_internal(dev->port->ha->core.shost->transportt);
240}
241
242static int sas_get_ata_command_set(struct domain_device *dev);
243
244int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
245{
246 if (phy->attached_tproto & SAS_PROTOCOL_STP)
247 dev->tproto = phy->attached_tproto;
248 if (phy->attached_sata_dev)
249 dev->tproto |= SAS_SATA_DEV;
250
251 if (phy->attached_dev_type == SAS_SATA_PENDING)
252 dev->dev_type = SAS_SATA_PENDING;
253 else {
254 int res;
255
256 dev->dev_type = SAS_SATA_DEV;
257 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
258 &dev->sata_dev.rps_resp);
259 if (res) {
260 pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
261 SAS_ADDR(dev->parent->sas_addr),
262 phy->phy_id, res);
263 return res;
264 }
265 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
266 sizeof(struct dev_to_host_fis));
267 dev->sata_dev.class = sas_get_ata_command_set(dev);
268 }
269 return 0;
270}
271
272static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
273{
274 int res;
275
276 /* we weren't pending, so successfully end the reset sequence now */
277 if (dev->dev_type != SAS_SATA_PENDING)
278 return 1;
279
280 /* hmmm, if this succeeds do we need to repost the domain_device to the
281 * lldd so it can pick up new parameters?
282 */
283 res = sas_get_ata_info(dev, phy);
284 if (res)
285 return 0; /* retry */
286 else
287 return 1;
288}
289
290int smp_ata_check_ready_type(struct ata_link *link)
291{
292 struct domain_device *dev = link->ap->private_data;
293 struct sas_phy *phy = sas_get_local_phy(dev);
294 struct domain_device *ex_dev = dev->parent;
295 enum sas_device_type type = SAS_PHY_UNUSED;
296 u8 sas_addr[SAS_ADDR_SIZE];
297 int res;
298
299 res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type);
300 sas_put_local_phy(phy);
301 if (res)
302 return res;
303
304 switch (type) {
305 case SAS_SATA_PENDING:
306 return 0;
307 case SAS_END_DEVICE:
308 return 1;
309 default:
310 return -ENODEV;
311 }
312}
313EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
314
315static int smp_ata_check_ready(struct ata_link *link)
316{
317 int res;
318 struct ata_port *ap = link->ap;
319 struct domain_device *dev = ap->private_data;
320 struct domain_device *ex_dev = dev->parent;
321 struct sas_phy *phy = sas_get_local_phy(dev);
322 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
323
324 res = sas_ex_phy_discover(ex_dev, phy->number);
325 sas_put_local_phy(phy);
326
327 /* break the wait early if the expander is unreachable,
328 * otherwise keep polling
329 */
330 if (res == -ECOMM)
331 return res;
332 if (res != SMP_RESP_FUNC_ACC)
333 return 0;
334
335 switch (ex_phy->attached_dev_type) {
336 case SAS_SATA_PENDING:
337 return 0;
338 case SAS_END_DEVICE:
339 if (ex_phy->attached_sata_dev)
340 return sas_ata_clear_pending(dev, ex_phy);
341 fallthrough;
342 default:
343 return -ENODEV;
344 }
345}
346
347static int local_ata_check_ready(struct ata_link *link)
348{
349 struct ata_port *ap = link->ap;
350 struct domain_device *dev = ap->private_data;
351 struct sas_internal *i = dev_to_sas_internal(dev);
352
353 if (i->dft->lldd_ata_check_ready)
354 return i->dft->lldd_ata_check_ready(dev);
355 else {
356 /* lldd's that don't implement 'ready' checking get the
357 * old default behavior of not coordinating reset
358 * recovery with libata
359 */
360 return 1;
361 }
362}
363
364static int sas_ata_printk(const char *level, const struct domain_device *ddev,
365 const char *fmt, ...)
366{
367 struct ata_port *ap = ddev->sata_dev.ap;
368 struct device *dev = &ddev->rphy->dev;
369 struct va_format vaf;
370 va_list args;
371 int r;
372
373 va_start(args, fmt);
374
375 vaf.fmt = fmt;
376 vaf.va = &args;
377
378 r = printk("%s" SAS_FMT "ata%u: %s: %pV",
379 level, ap->print_id, dev_name(dev), &vaf);
380
381 va_end(args);
382
383 return r;
384}
385
386static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
387{
388 struct sata_device *sata_dev = &dev->sata_dev;
389 int (*check_ready)(struct ata_link *link);
390 struct ata_port *ap = sata_dev->ap;
391 struct ata_link *link = &ap->link;
392 struct sas_phy *phy;
393 int ret;
394
395 phy = sas_get_local_phy(dev);
396 if (scsi_is_sas_phy_local(phy))
397 check_ready = local_ata_check_ready;
398 else
399 check_ready = smp_ata_check_ready;
400 sas_put_local_phy(phy);
401
402 ret = ata_wait_after_reset(link, deadline, check_ready);
403 if (ret && ret != -EAGAIN)
404 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
405
406 return ret;
407}
408
409static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
410 unsigned long deadline)
411{
412 struct ata_port *ap = link->ap;
413 struct domain_device *dev = ap->private_data;
414 struct sas_internal *i = dev_to_sas_internal(dev);
415 int ret;
416
417 ret = i->dft->lldd_I_T_nexus_reset(dev);
418 if (ret == -ENODEV)
419 return ret;
420
421 if (ret != TMF_RESP_FUNC_COMPLETE)
422 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
423
424 ret = sas_ata_wait_after_reset(dev, deadline);
425
426 *class = dev->sata_dev.class;
427
428 ap->cbl = ATA_CBL_SATA;
429 return ret;
430}
431
432/*
433 * notify the lldd to forget the sas_task for this internal ata command
434 * that bypasses scsi-eh
435 */
436static void sas_ata_internal_abort(struct sas_task *task)
437{
438 struct sas_internal *si = dev_to_sas_internal(task->dev);
439 unsigned long flags;
440 int res;
441
442 spin_lock_irqsave(&task->task_state_lock, flags);
443 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
444 task->task_state_flags & SAS_TASK_STATE_DONE) {
445 spin_unlock_irqrestore(&task->task_state_lock, flags);
446 pr_debug("%s: Task %p already finished.\n", __func__, task);
447 goto out;
448 }
449 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
450 spin_unlock_irqrestore(&task->task_state_lock, flags);
451
452 res = si->dft->lldd_abort_task(task);
453
454 spin_lock_irqsave(&task->task_state_lock, flags);
455 if (task->task_state_flags & SAS_TASK_STATE_DONE ||
456 res == TMF_RESP_FUNC_COMPLETE) {
457 spin_unlock_irqrestore(&task->task_state_lock, flags);
458 goto out;
459 }
460
461 /* XXX we are not prepared to deal with ->lldd_abort_task()
462 * failures. TODO: lldds need to unconditionally forget about
463 * aborted ata tasks, otherwise we (likely) leak the sas task
464 * here
465 */
466 pr_warn("%s: Task %p leaked.\n", __func__, task);
467
468 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
469 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
470 spin_unlock_irqrestore(&task->task_state_lock, flags);
471
472 return;
473 out:
474 sas_free_task(task);
475}
476
477static void sas_ata_post_internal(struct ata_queued_cmd *qc)
478{
479 if (qc->flags & ATA_QCFLAG_FAILED)
480 qc->err_mask |= AC_ERR_OTHER;
481
482 if (qc->err_mask) {
483 /*
484 * Find the sas_task and kill it. By this point, libata
485 * has decided to kill the qc and has frozen the port.
486 * In this state sas_ata_task_done() will no longer free
487 * the sas_task, so we need to notify the lldd (via
488 * ->lldd_abort_task) that the task is dead and free it
489 * ourselves.
490 */
491 struct sas_task *task = qc->lldd_task;
492
493 qc->lldd_task = NULL;
494 if (!task)
495 return;
496 task->uldd_task = NULL;
497 sas_ata_internal_abort(task);
498 }
499}
500
501
502static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
503{
504 struct domain_device *dev = ap->private_data;
505 struct sas_internal *i = dev_to_sas_internal(dev);
506
507 if (i->dft->lldd_ata_set_dmamode)
508 i->dft->lldd_ata_set_dmamode(dev);
509}
510
511static void sas_ata_sched_eh(struct ata_port *ap)
512{
513 struct domain_device *dev = ap->private_data;
514 struct sas_ha_struct *ha = dev->port->ha;
515 unsigned long flags;
516
517 spin_lock_irqsave(&ha->lock, flags);
518 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
519 ha->eh_active++;
520 ata_std_sched_eh(ap);
521 spin_unlock_irqrestore(&ha->lock, flags);
522}
523
524void sas_ata_end_eh(struct ata_port *ap)
525{
526 struct domain_device *dev = ap->private_data;
527 struct sas_ha_struct *ha = dev->port->ha;
528 unsigned long flags;
529
530 spin_lock_irqsave(&ha->lock, flags);
531 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
532 ha->eh_active--;
533 spin_unlock_irqrestore(&ha->lock, flags);
534}
535
536static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
537{
538 struct ata_port *ap = link->ap;
539 struct domain_device *dev = ap->private_data;
540 struct sas_phy *local_phy = sas_get_local_phy(dev);
541 int res = 0;
542
543 if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
544 res = -ENOENT;
545 sas_put_local_phy(local_phy);
546
547 return res;
548}
549
550static struct ata_port_operations sas_sata_ops = {
551 .prereset = sas_ata_prereset,
552 .hardreset = sas_ata_hard_reset,
553 .error_handler = ata_std_error_handler,
554 .post_internal_cmd = sas_ata_post_internal,
555 .qc_defer = ata_std_qc_defer,
556 .qc_prep = ata_noop_qc_prep,
557 .qc_issue = sas_ata_qc_issue,
558 .qc_fill_rtf = sas_ata_qc_fill_rtf,
559 .port_start = ata_sas_port_start,
560 .port_stop = ata_sas_port_stop,
561 .set_dmamode = sas_ata_set_dmamode,
562 .sched_eh = sas_ata_sched_eh,
563 .end_eh = sas_ata_end_eh,
564};
565
566static struct ata_port_info sata_port_info = {
567 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
568 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
569 .pio_mask = ATA_PIO4,
570 .mwdma_mask = ATA_MWDMA2,
571 .udma_mask = ATA_UDMA6,
572 .port_ops = &sas_sata_ops
573};
574
575int sas_ata_init(struct domain_device *found_dev)
576{
577 struct sas_ha_struct *ha = found_dev->port->ha;
578 struct Scsi_Host *shost = ha->core.shost;
579 struct ata_host *ata_host;
580 struct ata_port *ap;
581 int rc;
582
583 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
584 if (!ata_host) {
585 pr_err("ata host alloc failed.\n");
586 return -ENOMEM;
587 }
588
589 ata_host_init(ata_host, ha->dev, &sas_sata_ops);
590
591 ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
592 if (!ap) {
593 pr_err("ata_sas_port_alloc failed.\n");
594 rc = -ENODEV;
595 goto free_host;
596 }
597
598 ap->private_data = found_dev;
599 ap->cbl = ATA_CBL_SATA;
600 ap->scsi_host = shost;
601 rc = ata_sas_port_init(ap);
602 if (rc)
603 goto destroy_port;
604
605 rc = ata_sas_tport_add(ata_host->dev, ap);
606 if (rc)
607 goto destroy_port;
608
609 found_dev->sata_dev.ata_host = ata_host;
610 found_dev->sata_dev.ap = ap;
611
612 return 0;
613
614destroy_port:
615 ata_sas_port_destroy(ap);
616free_host:
617 ata_host_put(ata_host);
618 return rc;
619}
620
621void sas_ata_task_abort(struct sas_task *task)
622{
623 struct ata_queued_cmd *qc = task->uldd_task;
624 struct completion *waiting;
625
626 /* Bounce SCSI-initiated commands to the SCSI EH */
627 if (qc->scsicmd) {
628 blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
629 return;
630 }
631
632 /* Internal command, fake a timeout and complete. */
633 qc->flags &= ~ATA_QCFLAG_ACTIVE;
634 qc->flags |= ATA_QCFLAG_FAILED;
635 qc->err_mask |= AC_ERR_TIMEOUT;
636 waiting = qc->private_data;
637 complete(waiting);
638}
639
640static int sas_get_ata_command_set(struct domain_device *dev)
641{
642 struct dev_to_host_fis *fis =
643 (struct dev_to_host_fis *) dev->frame_rcvd;
644 struct ata_taskfile tf;
645
646 if (dev->dev_type == SAS_SATA_PENDING)
647 return ATA_DEV_UNKNOWN;
648
649 ata_tf_from_fis((const u8 *)fis, &tf);
650
651 return ata_dev_classify(&tf);
652}
653
654void sas_probe_sata(struct asd_sas_port *port)
655{
656 struct domain_device *dev, *n;
657
658 mutex_lock(&port->ha->disco_mutex);
659 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
660 if (!dev_is_sata(dev))
661 continue;
662
663 ata_sas_async_probe(dev->sata_dev.ap);
664 }
665 mutex_unlock(&port->ha->disco_mutex);
666
667 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
668 if (!dev_is_sata(dev))
669 continue;
670
671 sas_ata_wait_eh(dev);
672
673 /* if libata could not bring the link up, don't surface
674 * the device
675 */
676 if (!ata_dev_enabled(sas_to_ata_dev(dev)))
677 sas_fail_probe(dev, __func__, -ENODEV);
678 }
679
680}
681
682static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
683{
684 struct domain_device *dev, *n;
685
686 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
687 if (!dev_is_sata(dev))
688 continue;
689
690 sas_ata_wait_eh(dev);
691
692 /* if libata failed to power manage the device, tear it down */
693 if (ata_dev_disabled(sas_to_ata_dev(dev)))
694 sas_fail_probe(dev, func, -ENODEV);
695 }
696}
697
698void sas_suspend_sata(struct asd_sas_port *port)
699{
700 struct domain_device *dev;
701
702 mutex_lock(&port->ha->disco_mutex);
703 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
704 struct sata_device *sata;
705
706 if (!dev_is_sata(dev))
707 continue;
708
709 sata = &dev->sata_dev;
710 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
711 continue;
712
713 ata_sas_port_suspend(sata->ap);
714 }
715 mutex_unlock(&port->ha->disco_mutex);
716
717 sas_ata_flush_pm_eh(port, __func__);
718}
719
720void sas_resume_sata(struct asd_sas_port *port)
721{
722 struct domain_device *dev;
723
724 mutex_lock(&port->ha->disco_mutex);
725 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
726 struct sata_device *sata;
727
728 if (!dev_is_sata(dev))
729 continue;
730
731 sata = &dev->sata_dev;
732 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
733 continue;
734
735 ata_sas_port_resume(sata->ap);
736 }
737 mutex_unlock(&port->ha->disco_mutex);
738
739 sas_ata_flush_pm_eh(port, __func__);
740}
741
742/**
743 * sas_discover_sata - discover an STP/SATA domain device
744 * @dev: pointer to struct domain_device of interest
745 *
746 * Devices directly attached to a HA port, have no parents. All other
747 * devices do, and should have their "parent" pointer set appropriately
748 * before calling this function.
749 */
750int sas_discover_sata(struct domain_device *dev)
751{
752 if (dev->dev_type == SAS_SATA_PM)
753 return -ENODEV;
754
755 dev->sata_dev.class = sas_get_ata_command_set(dev);
756 sas_fill_in_rphy(dev, dev->rphy);
757
758 return sas_notify_lldd_dev_found(dev);
759}
760
761static void async_sas_ata_eh(void *data, async_cookie_t cookie)
762{
763 struct domain_device *dev = data;
764 struct ata_port *ap = dev->sata_dev.ap;
765 struct sas_ha_struct *ha = dev->port->ha;
766
767 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
768 ata_scsi_port_error_handler(ha->core.shost, ap);
769 sas_put_device(dev);
770}
771
772void sas_ata_strategy_handler(struct Scsi_Host *shost)
773{
774 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
775 ASYNC_DOMAIN_EXCLUSIVE(async);
776 int i;
777
778 /* it's ok to defer revalidation events during ata eh, these
779 * disks are in one of three states:
780 * 1/ present for initial domain discovery, and these
781 * resets will cause bcn flutters
782 * 2/ hot removed, we'll discover that after eh fails
783 * 3/ hot added after initial discovery, lost the race, and need
784 * to catch the next train.
785 */
786 sas_disable_revalidation(sas_ha);
787
788 spin_lock_irq(&sas_ha->phy_port_lock);
789 for (i = 0; i < sas_ha->num_phys; i++) {
790 struct asd_sas_port *port = sas_ha->sas_port[i];
791 struct domain_device *dev;
792
793 spin_lock(&port->dev_list_lock);
794 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
795 if (!dev_is_sata(dev))
796 continue;
797
798 /* hold a reference over eh since we may be
799 * racing with final remove once all commands
800 * are completed
801 */
802 kref_get(&dev->kref);
803
804 async_schedule_domain(async_sas_ata_eh, dev, &async);
805 }
806 spin_unlock(&port->dev_list_lock);
807 }
808 spin_unlock_irq(&sas_ha->phy_port_lock);
809
810 async_synchronize_full_domain(&async);
811
812 sas_enable_revalidation(sas_ha);
813}
814
815void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
816{
817 struct scsi_cmnd *cmd, *n;
818 struct domain_device *eh_dev;
819
820 do {
821 LIST_HEAD(sata_q);
822 eh_dev = NULL;
823
824 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
825 struct domain_device *ddev = cmd_to_domain_dev(cmd);
826
827 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
828 continue;
829 if (eh_dev && eh_dev != ddev)
830 continue;
831 eh_dev = ddev;
832 list_move(&cmd->eh_entry, &sata_q);
833 }
834
835 if (!list_empty(&sata_q)) {
836 struct ata_port *ap = eh_dev->sata_dev.ap;
837
838 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
839 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
840 /*
841 * ata's error handler may leave the cmd on the list
842 * so make sure they don't remain on a stack list
843 * about to go out of scope.
844 *
845 * This looks strange, since the commands are
846 * now part of no list, but the next error
847 * action will be ata_port_error_handler()
848 * which takes no list and sweeps them up
849 * anyway from the ata tag array.
850 */
851 while (!list_empty(&sata_q))
852 list_del_init(sata_q.next);
853 }
854 } while (eh_dev);
855}
856
857void sas_ata_schedule_reset(struct domain_device *dev)
858{
859 struct ata_eh_info *ehi;
860 struct ata_port *ap;
861 unsigned long flags;
862
863 if (!dev_is_sata(dev))
864 return;
865
866 ap = dev->sata_dev.ap;
867 ehi = &ap->link.eh_info;
868
869 spin_lock_irqsave(ap->lock, flags);
870 ehi->err_mask |= AC_ERR_TIMEOUT;
871 ehi->action |= ATA_EH_RESET;
872 ata_port_schedule_eh(ap);
873 spin_unlock_irqrestore(ap->lock, flags);
874}
875EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
876
877void sas_ata_wait_eh(struct domain_device *dev)
878{
879 struct ata_port *ap;
880
881 if (!dev_is_sata(dev))
882 return;
883
884 ap = dev->sata_dev.ap;
885 ata_port_wait_eh(ap);
886}
887
888void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
889{
890 struct ata_port *ap = device->sata_dev.ap;
891 struct ata_link *link = &ap->link;
892 unsigned long flags;
893
894 spin_lock_irqsave(ap->lock, flags);
895 device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
896 device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
897
898 link->eh_info.err_mask |= AC_ERR_DEV;
899 if (force_reset)
900 link->eh_info.action |= ATA_EH_RESET;
901 ata_link_abort(link);
902 spin_unlock_irqrestore(ap->lock, flags);
903}
904EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
905
906int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
907{
908 struct sas_tmf_task tmf_task = {};
909 return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
910 force_phy_id, &tmf_task);
911}
912EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);