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