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
sas_to_ata_err(struct task_status_struct * ts)27 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
28 {
29 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
30
31 /* transport error */
32 if (ts->resp == SAS_TASK_UNDELIVERED)
33 return AC_ERR_ATA_BUS;
34
35 /* ts->resp == SAS_TASK_COMPLETE */
36 /* task delivered, what happened afterwards? */
37 switch (ts->stat) {
38 case SAS_DEV_NO_RESPONSE:
39 return AC_ERR_TIMEOUT;
40 case SAS_INTERRUPTED:
41 case SAS_PHY_DOWN:
42 case SAS_NAK_R_ERR:
43 return AC_ERR_ATA_BUS;
44 case SAS_DATA_UNDERRUN:
45 /*
46 * Some programs that use the taskfile interface
47 * (smartctl in particular) can cause underrun
48 * problems. Ignore these errors, perhaps at our
49 * peril.
50 */
51 return 0;
52 case SAS_DATA_OVERRUN:
53 case SAS_QUEUE_FULL:
54 case SAS_DEVICE_UNKNOWN:
55 case SAS_OPEN_TO:
56 case SAS_OPEN_REJECT:
57 pr_warn("%s: Saw error %d. What to do?\n",
58 __func__, ts->stat);
59 return AC_ERR_OTHER;
60 case SAM_STAT_CHECK_CONDITION:
61 case SAS_ABORTED_TASK:
62 return AC_ERR_DEV;
63 case SAS_PROTO_RESPONSE:
64 /* This means the ending_fis has the error
65 * value; return 0 here to collect it
66 */
67 return 0;
68 default:
69 return 0;
70 }
71 }
72
sas_ata_task_done(struct sas_task * task)73 static void sas_ata_task_done(struct sas_task *task)
74 {
75 struct ata_queued_cmd *qc = task->uldd_task;
76 struct domain_device *dev = task->dev;
77 struct task_status_struct *stat = &task->task_status;
78 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
79 struct sas_ha_struct *sas_ha = dev->port->ha;
80 enum ata_completion_errors ac;
81 unsigned long flags;
82 struct ata_link *link;
83 struct ata_port *ap;
84
85 spin_lock_irqsave(&dev->done_lock, flags);
86 if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
87 task = NULL;
88 else if (qc && qc->scsicmd)
89 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
90 spin_unlock_irqrestore(&dev->done_lock, flags);
91
92 /* check if libsas-eh got to the task before us */
93 if (unlikely(!task))
94 return;
95
96 if (!qc)
97 goto qc_already_gone;
98
99 ap = qc->ap;
100 link = &ap->link;
101
102 spin_lock_irqsave(ap->lock, flags);
103 /* check if we lost the race with libata/sas_ata_post_internal() */
104 if (unlikely(ata_port_is_frozen(ap))) {
105 spin_unlock_irqrestore(ap->lock, flags);
106 if (qc->scsicmd)
107 goto qc_already_gone;
108 else {
109 /* if eh is not involved and the port is frozen then the
110 * ata internal abort process has taken responsibility
111 * for this sas_task
112 */
113 return;
114 }
115 }
116
117 if (stat->stat == SAS_PROTO_RESPONSE ||
118 stat->stat == SAS_SAM_STAT_GOOD ||
119 (stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
120 dev->sata_dev.class == ATA_DEV_ATAPI)) {
121 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
122
123 if (!link->sactive) {
124 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
125 } else {
126 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
127 if (unlikely(link->eh_info.err_mask))
128 qc->flags |= ATA_QCFLAG_EH;
129 }
130 } else {
131 ac = sas_to_ata_err(stat);
132 if (ac) {
133 pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
134 /* We saw a SAS error. Send a vague error. */
135 if (!link->sactive) {
136 qc->err_mask = ac;
137 } else {
138 link->eh_info.err_mask |= AC_ERR_DEV;
139 qc->flags |= ATA_QCFLAG_EH;
140 }
141
142 dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
143 dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
144 }
145 }
146
147 qc->lldd_task = NULL;
148 ata_qc_complete(qc);
149 spin_unlock_irqrestore(ap->lock, flags);
150
151 qc_already_gone:
152 sas_free_task(task);
153 }
154
sas_ata_qc_issue(struct ata_queued_cmd * qc)155 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
156 __must_hold(ap->lock)
157 {
158 struct sas_task *task;
159 struct scatterlist *sg;
160 int ret = AC_ERR_SYSTEM;
161 unsigned int si, xfer = 0;
162 struct ata_port *ap = qc->ap;
163 struct domain_device *dev = ap->private_data;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *host = sas_ha->shost;
166 struct sas_internal *i = to_sas_internal(host->transportt);
167
168 /* TODO: we should try to remove that unlock */
169 spin_unlock(ap->lock);
170
171 /* If the device fell off, no sense in issuing commands */
172 if (test_bit(SAS_DEV_GONE, &dev->state))
173 goto out;
174
175 task = sas_alloc_task(GFP_ATOMIC);
176 if (!task)
177 goto out;
178 task->dev = dev;
179 task->task_proto = SAS_PROTOCOL_STP;
180 task->task_done = sas_ata_task_done;
181
182 /* For NCQ commands, zero out the tag libata assigned us */
183 if (ata_is_ncq(qc->tf.protocol))
184 qc->tf.nsect = 0;
185
186 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
187 task->uldd_task = qc;
188 if (ata_is_atapi(qc->tf.protocol)) {
189 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
190 task->total_xfer_len = qc->nbytes;
191 task->num_scatter = qc->n_elem;
192 task->data_dir = qc->dma_dir;
193 } else if (!ata_is_data(qc->tf.protocol)) {
194 task->data_dir = DMA_NONE;
195 } else {
196 for_each_sg(qc->sg, sg, qc->n_elem, si)
197 xfer += sg_dma_len(sg);
198
199 task->total_xfer_len = xfer;
200 task->num_scatter = si;
201 task->data_dir = qc->dma_dir;
202 }
203 task->scatter = qc->sg;
204 qc->lldd_task = task;
205
206 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
207 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
208
209 if (qc->flags & ATA_QCFLAG_RESULT_TF)
210 task->ata_task.return_fis_on_success = 1;
211
212 if (qc->scsicmd)
213 ASSIGN_SAS_TASK(qc->scsicmd, task);
214
215 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
216 if (ret) {
217 pr_debug("lldd_execute_task returned: %d\n", ret);
218
219 if (qc->scsicmd)
220 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
221 sas_free_task(task);
222 qc->lldd_task = NULL;
223 ret = AC_ERR_SYSTEM;
224 }
225
226 out:
227 spin_lock(ap->lock);
228 return ret;
229 }
230
sas_ata_qc_fill_rtf(struct ata_queued_cmd * qc)231 static void sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
232 {
233 struct domain_device *dev = qc->ap->private_data;
234
235 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
236 }
237
dev_to_sas_internal(struct domain_device * dev)238 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
239 {
240 return to_sas_internal(dev->port->ha->shost->transportt);
241 }
242
sas_get_ata_command_set(struct domain_device * dev)243 static int sas_get_ata_command_set(struct domain_device *dev)
244 {
245 struct ata_taskfile tf;
246
247 if (dev->dev_type == SAS_SATA_PENDING)
248 return ATA_DEV_UNKNOWN;
249
250 ata_tf_from_fis(dev->frame_rcvd, &tf);
251
252 return ata_dev_classify(&tf);
253 }
254
sas_get_ata_info(struct domain_device * dev,struct ex_phy * phy)255 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
256 {
257 if (phy->attached_tproto & SAS_PROTOCOL_STP)
258 dev->tproto = phy->attached_tproto;
259 if (phy->attached_sata_dev)
260 dev->tproto |= SAS_SATA_DEV;
261
262 if (phy->attached_dev_type == SAS_SATA_PENDING)
263 dev->dev_type = SAS_SATA_PENDING;
264 else {
265 int res;
266
267 dev->dev_type = SAS_SATA_DEV;
268 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
269 &dev->sata_dev.rps_resp);
270 if (res) {
271 pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
272 SAS_ADDR(dev->parent->sas_addr),
273 phy->phy_id, res);
274 return res;
275 }
276 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
277 sizeof(struct dev_to_host_fis));
278 dev->sata_dev.class = sas_get_ata_command_set(dev);
279 }
280 return 0;
281 }
282
sas_ata_clear_pending(struct domain_device * dev,struct ex_phy * phy)283 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
284 {
285 int res;
286
287 /* we weren't pending, so successfully end the reset sequence now */
288 if (dev->dev_type != SAS_SATA_PENDING)
289 return 1;
290
291 /* hmmm, if this succeeds do we need to repost the domain_device to the
292 * lldd so it can pick up new parameters?
293 */
294 res = sas_get_ata_info(dev, phy);
295 if (res)
296 return 0; /* retry */
297 else
298 return 1;
299 }
300
smp_ata_check_ready_type(struct ata_link * link)301 int smp_ata_check_ready_type(struct ata_link *link)
302 {
303 struct domain_device *dev = link->ap->private_data;
304 struct sas_phy *phy = sas_get_local_phy(dev);
305 struct domain_device *ex_dev = dev->parent;
306 enum sas_device_type type = SAS_PHY_UNUSED;
307 u8 sas_addr[SAS_ADDR_SIZE];
308 int res;
309
310 res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type);
311 sas_put_local_phy(phy);
312 if (res)
313 return res;
314
315 switch (type) {
316 case SAS_SATA_PENDING:
317 return 0;
318 case SAS_END_DEVICE:
319 return 1;
320 default:
321 return -ENODEV;
322 }
323 }
324 EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
325
smp_ata_check_ready(struct ata_link * link)326 static int smp_ata_check_ready(struct ata_link *link)
327 {
328 int res;
329 struct ata_port *ap = link->ap;
330 struct domain_device *dev = ap->private_data;
331 struct domain_device *ex_dev = dev->parent;
332 struct sas_phy *phy = sas_get_local_phy(dev);
333 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
334
335 res = sas_ex_phy_discover(ex_dev, phy->number);
336 sas_put_local_phy(phy);
337
338 /* break the wait early if the expander is unreachable,
339 * otherwise keep polling
340 */
341 if (res == -ECOMM)
342 return res;
343 if (res != SMP_RESP_FUNC_ACC)
344 return 0;
345
346 switch (ex_phy->attached_dev_type) {
347 case SAS_SATA_PENDING:
348 return 0;
349 case SAS_END_DEVICE:
350 if (ex_phy->attached_sata_dev)
351 return sas_ata_clear_pending(dev, ex_phy);
352 fallthrough;
353 default:
354 return -ENODEV;
355 }
356 }
357
local_ata_check_ready(struct ata_link * link)358 static int local_ata_check_ready(struct ata_link *link)
359 {
360 struct ata_port *ap = link->ap;
361 struct domain_device *dev = ap->private_data;
362 struct sas_internal *i = dev_to_sas_internal(dev);
363
364 if (i->dft->lldd_ata_check_ready)
365 return i->dft->lldd_ata_check_ready(dev);
366 else {
367 /* lldd's that don't implement 'ready' checking get the
368 * old default behavior of not coordinating reset
369 * recovery with libata
370 */
371 return 1;
372 }
373 }
374
sas_ata_printk(const char * level,const struct domain_device * ddev,const char * fmt,...)375 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
376 const char *fmt, ...)
377 {
378 struct ata_port *ap = ddev->sata_dev.ap;
379 struct device *dev = &ddev->rphy->dev;
380 struct va_format vaf;
381 va_list args;
382 int r;
383
384 va_start(args, fmt);
385
386 vaf.fmt = fmt;
387 vaf.va = &args;
388
389 r = printk("%s" SAS_FMT "ata%u: %s: %pV",
390 level, ap->print_id, dev_name(dev), &vaf);
391
392 va_end(args);
393
394 return r;
395 }
396
sas_ata_wait_after_reset(struct domain_device * dev,unsigned long deadline)397 static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
398 {
399 struct sata_device *sata_dev = &dev->sata_dev;
400 int (*check_ready)(struct ata_link *link);
401 struct ata_port *ap = sata_dev->ap;
402 struct ata_link *link = &ap->link;
403 struct sas_phy *phy;
404 int ret;
405
406 phy = sas_get_local_phy(dev);
407 if (scsi_is_sas_phy_local(phy))
408 check_ready = local_ata_check_ready;
409 else
410 check_ready = smp_ata_check_ready;
411 sas_put_local_phy(phy);
412
413 ret = ata_wait_after_reset(link, deadline, check_ready);
414 if (ret && ret != -EAGAIN)
415 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
416
417 return ret;
418 }
419
sas_ata_hard_reset(struct ata_link * link,unsigned int * class,unsigned long deadline)420 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
421 unsigned long deadline)
422 {
423 struct ata_port *ap = link->ap;
424 struct domain_device *dev = ap->private_data;
425 struct sas_internal *i = dev_to_sas_internal(dev);
426 int ret;
427
428 ret = i->dft->lldd_I_T_nexus_reset(dev);
429 if (ret == -ENODEV)
430 return ret;
431
432 if (ret != TMF_RESP_FUNC_COMPLETE)
433 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
434
435 ret = sas_ata_wait_after_reset(dev, deadline);
436
437 *class = dev->sata_dev.class;
438
439 ap->cbl = ATA_CBL_SATA;
440 return ret;
441 }
442
443 /*
444 * notify the lldd to forget the sas_task for this internal ata command
445 * that bypasses scsi-eh
446 */
sas_ata_internal_abort(struct sas_task * task)447 static void sas_ata_internal_abort(struct sas_task *task)
448 {
449 struct sas_internal *si = dev_to_sas_internal(task->dev);
450 unsigned long flags;
451 int res;
452
453 spin_lock_irqsave(&task->task_state_lock, flags);
454 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
455 task->task_state_flags & SAS_TASK_STATE_DONE) {
456 spin_unlock_irqrestore(&task->task_state_lock, flags);
457 pr_debug("%s: Task %p already finished.\n", __func__, task);
458 goto out;
459 }
460 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
461 spin_unlock_irqrestore(&task->task_state_lock, flags);
462
463 res = si->dft->lldd_abort_task(task);
464
465 spin_lock_irqsave(&task->task_state_lock, flags);
466 if (task->task_state_flags & SAS_TASK_STATE_DONE ||
467 res == TMF_RESP_FUNC_COMPLETE) {
468 spin_unlock_irqrestore(&task->task_state_lock, flags);
469 goto out;
470 }
471
472 /* XXX we are not prepared to deal with ->lldd_abort_task()
473 * failures. TODO: lldds need to unconditionally forget about
474 * aborted ata tasks, otherwise we (likely) leak the sas task
475 * here
476 */
477 pr_warn("%s: Task %p leaked.\n", __func__, task);
478
479 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
480 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
481 spin_unlock_irqrestore(&task->task_state_lock, flags);
482
483 return;
484 out:
485 sas_free_task(task);
486 }
487
sas_ata_post_internal(struct ata_queued_cmd * qc)488 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
489 {
490 if (qc->flags & ATA_QCFLAG_EH)
491 qc->err_mask |= AC_ERR_OTHER;
492
493 if (qc->err_mask) {
494 /*
495 * Find the sas_task and kill it. By this point, libata
496 * has decided to kill the qc and has frozen the port.
497 * In this state sas_ata_task_done() will no longer free
498 * the sas_task, so we need to notify the lldd (via
499 * ->lldd_abort_task) that the task is dead and free it
500 * ourselves.
501 */
502 struct sas_task *task = qc->lldd_task;
503
504 qc->lldd_task = NULL;
505 if (!task)
506 return;
507 task->uldd_task = NULL;
508 sas_ata_internal_abort(task);
509 }
510 }
511
512
sas_ata_set_dmamode(struct ata_port * ap,struct ata_device * ata_dev)513 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
514 {
515 struct domain_device *dev = ap->private_data;
516 struct sas_internal *i = dev_to_sas_internal(dev);
517
518 if (i->dft->lldd_ata_set_dmamode)
519 i->dft->lldd_ata_set_dmamode(dev);
520 }
521
sas_ata_sched_eh(struct ata_port * ap)522 static void sas_ata_sched_eh(struct ata_port *ap)
523 {
524 struct domain_device *dev = ap->private_data;
525 struct sas_ha_struct *ha = dev->port->ha;
526 unsigned long flags;
527
528 spin_lock_irqsave(&ha->lock, flags);
529 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
530 ha->eh_active++;
531 ata_std_sched_eh(ap);
532 spin_unlock_irqrestore(&ha->lock, flags);
533 }
534
sas_ata_end_eh(struct ata_port * ap)535 void sas_ata_end_eh(struct ata_port *ap)
536 {
537 struct domain_device *dev = ap->private_data;
538 struct sas_ha_struct *ha = dev->port->ha;
539 unsigned long flags;
540
541 spin_lock_irqsave(&ha->lock, flags);
542 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
543 ha->eh_active--;
544 spin_unlock_irqrestore(&ha->lock, flags);
545 }
546
sas_ata_prereset(struct ata_link * link,unsigned long deadline)547 static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
548 {
549 struct ata_port *ap = link->ap;
550 struct domain_device *dev = ap->private_data;
551 struct sas_phy *local_phy = sas_get_local_phy(dev);
552 int res = 0;
553
554 if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
555 res = -ENOENT;
556 sas_put_local_phy(local_phy);
557
558 return res;
559 }
560
561 static struct ata_port_operations sas_sata_ops = {
562 .prereset = sas_ata_prereset,
563 .hardreset = sas_ata_hard_reset,
564 .error_handler = ata_std_error_handler,
565 .post_internal_cmd = sas_ata_post_internal,
566 .qc_defer = ata_std_qc_defer,
567 .qc_prep = ata_noop_qc_prep,
568 .qc_issue = sas_ata_qc_issue,
569 .qc_fill_rtf = sas_ata_qc_fill_rtf,
570 .set_dmamode = sas_ata_set_dmamode,
571 .sched_eh = sas_ata_sched_eh,
572 .end_eh = sas_ata_end_eh,
573 };
574
575 static struct ata_port_info sata_port_info = {
576 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
577 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
578 .pio_mask = ATA_PIO4,
579 .mwdma_mask = ATA_MWDMA2,
580 .udma_mask = ATA_UDMA6,
581 .port_ops = &sas_sata_ops
582 };
583
sas_ata_init(struct domain_device * found_dev)584 int sas_ata_init(struct domain_device *found_dev)
585 {
586 struct sas_ha_struct *ha = found_dev->port->ha;
587 struct Scsi_Host *shost = ha->shost;
588 struct ata_host *ata_host;
589 struct ata_port *ap;
590 int rc;
591
592 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
593 if (!ata_host) {
594 pr_err("ata host alloc failed.\n");
595 return -ENOMEM;
596 }
597
598 ata_host_init(ata_host, ha->dev, &sas_sata_ops);
599
600 ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
601 if (!ap) {
602 pr_err("ata_sas_port_alloc failed.\n");
603 rc = -ENODEV;
604 goto free_host;
605 }
606
607 ap->private_data = found_dev;
608 ap->cbl = ATA_CBL_SATA;
609 ap->scsi_host = shost;
610
611 rc = ata_sas_tport_add(ata_host->dev, ap);
612 if (rc)
613 goto destroy_port;
614
615 found_dev->sata_dev.ata_host = ata_host;
616 found_dev->sata_dev.ap = ap;
617
618 return 0;
619
620 destroy_port:
621 kfree(ap);
622 free_host:
623 ata_host_put(ata_host);
624 return rc;
625 }
626
sas_ata_task_abort(struct sas_task * task)627 void sas_ata_task_abort(struct sas_task *task)
628 {
629 struct ata_queued_cmd *qc = task->uldd_task;
630 struct completion *waiting;
631
632 /* Bounce SCSI-initiated commands to the SCSI EH */
633 if (qc->scsicmd) {
634 blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
635 return;
636 }
637
638 /* Internal command, fake a timeout and complete. */
639 qc->flags &= ~ATA_QCFLAG_ACTIVE;
640 qc->flags |= ATA_QCFLAG_EH;
641 qc->err_mask |= AC_ERR_TIMEOUT;
642 waiting = qc->private_data;
643 complete(waiting);
644 }
645
sas_probe_sata(struct asd_sas_port * port)646 void sas_probe_sata(struct asd_sas_port *port)
647 {
648 struct domain_device *dev, *n;
649
650 mutex_lock(&port->ha->disco_mutex);
651 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
652 if (!dev_is_sata(dev))
653 continue;
654
655 ata_port_probe(dev->sata_dev.ap);
656 }
657 mutex_unlock(&port->ha->disco_mutex);
658
659 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
660 if (!dev_is_sata(dev))
661 continue;
662
663 sas_ata_wait_eh(dev);
664
665 /* if libata could not bring the link up, don't surface
666 * the device
667 */
668 if (!ata_dev_enabled(sas_to_ata_dev(dev)))
669 sas_fail_probe(dev, __func__, -ENODEV);
670 }
671
672 }
673
sas_ata_add_dev(struct domain_device * parent,struct ex_phy * phy,struct domain_device * child,int phy_id)674 int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
675 struct domain_device *child, int phy_id)
676 {
677 struct sas_rphy *rphy;
678 int ret;
679
680 if (child->linkrate > parent->min_linkrate) {
681 struct sas_phy *cphy = child->phy;
682 enum sas_linkrate min_prate = cphy->minimum_linkrate,
683 parent_min_lrate = parent->min_linkrate,
684 min_linkrate = (min_prate > parent_min_lrate) ?
685 parent_min_lrate : 0;
686 struct sas_phy_linkrates rates = {
687 .maximum_linkrate = parent->min_linkrate,
688 .minimum_linkrate = min_linkrate,
689 };
690
691 pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
692 SAS_ADDR(child->sas_addr), phy_id);
693 ret = sas_smp_phy_control(parent, phy_id,
694 PHY_FUNC_LINK_RESET, &rates);
695 if (ret) {
696 pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
697 SAS_ADDR(child->sas_addr), phy_id, ret);
698 return ret;
699 }
700 pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
701 SAS_ADDR(child->sas_addr), phy_id);
702 child->linkrate = child->min_linkrate;
703 }
704 ret = sas_get_ata_info(child, phy);
705 if (ret)
706 return ret;
707
708 sas_init_dev(child);
709 ret = sas_ata_init(child);
710 if (ret)
711 return ret;
712
713 rphy = sas_end_device_alloc(phy->port);
714 if (!rphy)
715 return -ENOMEM;
716
717 rphy->identify.phy_identifier = phy_id;
718 child->rphy = rphy;
719 get_device(&rphy->dev);
720
721 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
722
723 ret = sas_discover_sata(child);
724 if (ret) {
725 pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n",
726 SAS_ADDR(child->sas_addr),
727 SAS_ADDR(parent->sas_addr), phy_id, ret);
728 sas_rphy_free(child->rphy);
729 list_del(&child->disco_list_node);
730 return ret;
731 }
732
733 return 0;
734 }
735
sas_ata_flush_pm_eh(struct asd_sas_port * port,const char * func)736 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
737 {
738 struct domain_device *dev, *n;
739
740 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
741 if (!dev_is_sata(dev))
742 continue;
743
744 sas_ata_wait_eh(dev);
745
746 /* if libata failed to power manage the device, tear it down */
747 if (ata_dev_disabled(sas_to_ata_dev(dev)))
748 sas_fail_probe(dev, func, -ENODEV);
749 }
750 }
751
sas_suspend_sata(struct asd_sas_port * port)752 void sas_suspend_sata(struct asd_sas_port *port)
753 {
754 struct domain_device *dev;
755
756 mutex_lock(&port->ha->disco_mutex);
757 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
758 struct sata_device *sata;
759
760 if (!dev_is_sata(dev))
761 continue;
762
763 sata = &dev->sata_dev;
764 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
765 continue;
766
767 ata_sas_port_suspend(sata->ap);
768 }
769 mutex_unlock(&port->ha->disco_mutex);
770
771 sas_ata_flush_pm_eh(port, __func__);
772 }
773
sas_resume_sata(struct asd_sas_port * port)774 void sas_resume_sata(struct asd_sas_port *port)
775 {
776 struct domain_device *dev;
777
778 mutex_lock(&port->ha->disco_mutex);
779 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
780 struct sata_device *sata;
781
782 if (!dev_is_sata(dev))
783 continue;
784
785 sata = &dev->sata_dev;
786 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
787 continue;
788
789 ata_sas_port_resume(sata->ap);
790 }
791 mutex_unlock(&port->ha->disco_mutex);
792
793 sas_ata_flush_pm_eh(port, __func__);
794 }
795
796 /**
797 * sas_discover_sata - discover an STP/SATA domain device
798 * @dev: pointer to struct domain_device of interest
799 *
800 * Devices directly attached to a HA port, have no parents. All other
801 * devices do, and should have their "parent" pointer set appropriately
802 * before calling this function.
803 */
sas_discover_sata(struct domain_device * dev)804 int sas_discover_sata(struct domain_device *dev)
805 {
806 if (dev->dev_type == SAS_SATA_PM)
807 return -ENODEV;
808
809 dev->sata_dev.class = sas_get_ata_command_set(dev);
810 sas_fill_in_rphy(dev, dev->rphy);
811
812 return sas_notify_lldd_dev_found(dev);
813 }
814
async_sas_ata_eh(void * data,async_cookie_t cookie)815 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
816 {
817 struct domain_device *dev = data;
818 struct ata_port *ap = dev->sata_dev.ap;
819 struct sas_ha_struct *ha = dev->port->ha;
820
821 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
822 ata_scsi_port_error_handler(ha->shost, ap);
823 sas_put_device(dev);
824 }
825
sas_ata_strategy_handler(struct Scsi_Host * shost)826 void sas_ata_strategy_handler(struct Scsi_Host *shost)
827 {
828 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
829 ASYNC_DOMAIN_EXCLUSIVE(async);
830 int i;
831
832 /* it's ok to defer revalidation events during ata eh, these
833 * disks are in one of three states:
834 * 1/ present for initial domain discovery, and these
835 * resets will cause bcn flutters
836 * 2/ hot removed, we'll discover that after eh fails
837 * 3/ hot added after initial discovery, lost the race, and need
838 * to catch the next train.
839 */
840 sas_disable_revalidation(sas_ha);
841
842 spin_lock_irq(&sas_ha->phy_port_lock);
843 for (i = 0; i < sas_ha->num_phys; i++) {
844 struct asd_sas_port *port = sas_ha->sas_port[i];
845 struct domain_device *dev;
846
847 spin_lock(&port->dev_list_lock);
848 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
849 if (!dev_is_sata(dev))
850 continue;
851
852 /* hold a reference over eh since we may be
853 * racing with final remove once all commands
854 * are completed
855 */
856 kref_get(&dev->kref);
857
858 async_schedule_domain(async_sas_ata_eh, dev, &async);
859 }
860 spin_unlock(&port->dev_list_lock);
861 }
862 spin_unlock_irq(&sas_ha->phy_port_lock);
863
864 async_synchronize_full_domain(&async);
865
866 sas_enable_revalidation(sas_ha);
867 }
868
sas_ata_eh(struct Scsi_Host * shost,struct list_head * work_q)869 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
870 {
871 struct scsi_cmnd *cmd, *n;
872 struct domain_device *eh_dev;
873
874 do {
875 LIST_HEAD(sata_q);
876 eh_dev = NULL;
877
878 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
879 struct domain_device *ddev = cmd_to_domain_dev(cmd);
880
881 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
882 continue;
883 if (eh_dev && eh_dev != ddev)
884 continue;
885 eh_dev = ddev;
886 list_move(&cmd->eh_entry, &sata_q);
887 }
888
889 if (!list_empty(&sata_q)) {
890 struct ata_port *ap = eh_dev->sata_dev.ap;
891
892 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
893 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
894 /*
895 * ata's error handler may leave the cmd on the list
896 * so make sure they don't remain on a stack list
897 * about to go out of scope.
898 *
899 * This looks strange, since the commands are
900 * now part of no list, but the next error
901 * action will be ata_port_error_handler()
902 * which takes no list and sweeps them up
903 * anyway from the ata tag array.
904 */
905 while (!list_empty(&sata_q))
906 list_del_init(sata_q.next);
907 }
908 } while (eh_dev);
909 }
910
sas_ata_schedule_reset(struct domain_device * dev)911 void sas_ata_schedule_reset(struct domain_device *dev)
912 {
913 struct ata_eh_info *ehi;
914 struct ata_port *ap;
915 unsigned long flags;
916
917 if (!dev_is_sata(dev))
918 return;
919
920 ap = dev->sata_dev.ap;
921 ehi = &ap->link.eh_info;
922
923 spin_lock_irqsave(ap->lock, flags);
924 ehi->err_mask |= AC_ERR_TIMEOUT;
925 ehi->action |= ATA_EH_RESET;
926 ata_port_schedule_eh(ap);
927 spin_unlock_irqrestore(ap->lock, flags);
928 }
929 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
930
sas_ata_wait_eh(struct domain_device * dev)931 void sas_ata_wait_eh(struct domain_device *dev)
932 {
933 struct ata_port *ap;
934
935 if (!dev_is_sata(dev))
936 return;
937
938 ap = dev->sata_dev.ap;
939 ata_port_wait_eh(ap);
940 }
941
sas_ata_device_link_abort(struct domain_device * device,bool force_reset)942 void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
943 {
944 struct ata_port *ap = device->sata_dev.ap;
945 struct ata_link *link = &ap->link;
946 unsigned long flags;
947
948 spin_lock_irqsave(ap->lock, flags);
949 device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
950 device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
951
952 link->eh_info.err_mask |= AC_ERR_DEV;
953 if (force_reset)
954 link->eh_info.action |= ATA_EH_RESET;
955 ata_link_abort(link);
956 spin_unlock_irqrestore(ap->lock, flags);
957 }
958 EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
959
sas_execute_ata_cmd(struct domain_device * device,u8 * fis,int force_phy_id)960 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
961 {
962 struct sas_tmf_task tmf_task = {};
963 return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
964 force_phy_id, &tmf_task);
965 }
966 EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
967