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