1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
4 *
5 * Copyright (C) 2006 IBM Corporation
6 *
7 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
8 */
9
10#include <linux/scatterlist.h>
11#include <linux/slab.h>
12#include <linux/async.h>
13#include <linux/export.h>
14
15#include <scsi/sas_ata.h>
16#include "sas_internal.h"
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_tcq.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_transport.h>
22#include <scsi/scsi_transport_sas.h>
23#include "scsi_sas_internal.h"
24#include "scsi_transport_api.h"
25#include <scsi/scsi_eh.h>
26
27static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
28{
29 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
30
31 /* transport error */
32 if (ts->resp == SAS_TASK_UNDELIVERED)
33 return AC_ERR_ATA_BUS;
34
35 /* ts->resp == SAS_TASK_COMPLETE */
36 /* task delivered, what happened afterwards? */
37 switch (ts->stat) {
38 case SAS_DEV_NO_RESPONSE:
39 return AC_ERR_TIMEOUT;
40 case SAS_INTERRUPTED:
41 case SAS_PHY_DOWN:
42 case SAS_NAK_R_ERR:
43 return AC_ERR_ATA_BUS;
44 case SAS_DATA_UNDERRUN:
45 /*
46 * Some programs that use the taskfile interface
47 * (smartctl in particular) can cause underrun
48 * problems. Ignore these errors, perhaps at our
49 * peril.
50 */
51 return 0;
52 case SAS_DATA_OVERRUN:
53 case SAS_QUEUE_FULL:
54 case SAS_DEVICE_UNKNOWN:
55 case SAS_OPEN_TO:
56 case SAS_OPEN_REJECT:
57 pr_warn("%s: Saw error %d. What to do?\n",
58 __func__, ts->stat);
59 return AC_ERR_OTHER;
60 case SAM_STAT_CHECK_CONDITION:
61 case SAS_ABORTED_TASK:
62 return AC_ERR_DEV;
63 case SAS_PROTO_RESPONSE:
64 /* This means the ending_fis has the error
65 * value; return 0 here to collect it
66 */
67 return 0;
68 default:
69 return 0;
70 }
71}
72
73static void sas_ata_task_done(struct sas_task *task)
74{
75 struct ata_queued_cmd *qc = task->uldd_task;
76 struct domain_device *dev = task->dev;
77 struct task_status_struct *stat = &task->task_status;
78 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
79 struct sas_ha_struct *sas_ha = dev->port->ha;
80 enum ata_completion_errors ac;
81 unsigned long flags;
82 struct ata_link *link;
83 struct ata_port *ap;
84
85 spin_lock_irqsave(&dev->done_lock, flags);
86 if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
87 task = NULL;
88 else if (qc && qc->scsicmd)
89 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
90 spin_unlock_irqrestore(lock: &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(lock: 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(status: dev->sata_dev.fis[2]);
125 } else {
126 link->eh_info.err_mask |= ac_err_mask(status: 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(ts: 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(lock: ap->lock, flags);
150
151qc_already_gone:
152 sas_free_task(task);
153}
154
155static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
156 __must_hold(ap->lock)
157{
158 struct sas_task *task;
159 struct scatterlist *sg;
160 int ret = AC_ERR_SYSTEM;
161 unsigned int si, xfer = 0;
162 struct ata_port *ap = qc->ap;
163 struct domain_device *dev = ap->private_data;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *host = sas_ha->shost;
166 struct sas_internal *i = to_sas_internal(host->transportt);
167
168 /* TODO: we should try to remove that unlock */
169 spin_unlock(lock: 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(prot: qc->tf.protocol))
184 qc->tf.nsect = 0;
185
186 ata_tf_to_fis(tf: &qc->tf, pmp: qc->dev->link->pmp, is_cmd: 1, fis: (u8 *)&task->ata_task.fis);
187 task->uldd_task = qc;
188 if (ata_is_atapi(prot: 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(prot: 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(prot: qc->tf.protocol);
207 task->ata_task.dma_xfer = ata_is_dma(prot: 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(lock: ap->lock);
228 return ret;
229}
230
231static 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(fis: dev->sata_dev.fis, tf: &qc->result_tf);
236}
237
238static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
239{
240 return to_sas_internal(dev->port->ha->shost->transportt);
241}
242
243static 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(fis: dev->frame_rcvd, tf: &tf);
251
252 return ata_dev_classify(tf: &tf);
253}
254
255static 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: dev->parent, phy_id: phy->phy_id,
269 rps_resp: &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
283static 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
301int 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(dev: ex_dev, phy_id: phy->number, sas_addr, type: &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}
324EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
325
326static 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(dev: ex_dev, single: 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, phy: ex_phy);
352 fallthrough;
353 default:
354 return -ENODEV;
355 }
356}
357
358static 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
375static 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
397static 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, ddev: dev, fmt: "reset failed (errno=%d)\n", ret);
416
417 return ret;
418}
419
420static 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, ddev: dev, fmt: "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 */
447static void sas_ata_internal_abort(struct sas_task *task)
448{
449 struct sas_internal *si = dev_to_sas_internal(dev: 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(lock: &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(lock: &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(lock: &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(lock: &task->task_state_lock, flags);
482
483 return;
484 out:
485 sas_free_task(task);
486}
487
488static 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
513static 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
522static 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(nr: SAS_DEV_EH_PENDING, addr: &dev->state))
530 ha->eh_active++;
531 ata_std_sched_eh(ap);
532 spin_unlock_irqrestore(lock: &ha->lock, flags);
533}
534
535void 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(nr: SAS_DEV_EH_PENDING, addr: &dev->state))
543 ha->eh_active--;
544 spin_unlock_irqrestore(lock: &ha->lock, flags);
545}
546
547static 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(phy: local_phy);
557
558 return res;
559}
560
561static struct ata_port_operations sas_sata_ops = {
562 .reset.prereset = sas_ata_prereset,
563 .reset.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_issue = sas_ata_qc_issue,
568 .qc_fill_rtf = sas_ata_qc_fill_rtf,
569 .set_dmamode = sas_ata_set_dmamode,
570 .sched_eh = sas_ata_sched_eh,
571 .end_eh = sas_ata_end_eh,
572};
573
574int sas_ata_init(struct domain_device *found_dev)
575{
576 struct sas_ha_struct *ha = found_dev->port->ha;
577 struct Scsi_Host *shost = ha->shost;
578 struct ata_host *ata_host;
579 struct ata_port *ap;
580 int rc;
581
582 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
583 if (!ata_host) {
584 pr_err("ata host alloc failed.\n");
585 return -ENOMEM;
586 }
587
588 ata_host_init(ata_host, ha->dev, &sas_sata_ops);
589
590 ap = ata_port_alloc(host: ata_host);
591 if (!ap) {
592 pr_err("ata_port_alloc failed.\n");
593 rc = -ENODEV;
594 goto free_host;
595 }
596
597 ap->port_no = 0;
598 ap->pio_mask = ATA_PIO4;
599 ap->mwdma_mask = ATA_MWDMA2;
600 ap->udma_mask = ATA_UDMA6;
601 ap->flags |= ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
602 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX;
603 ap->ops = &sas_sata_ops;
604 ap->private_data = found_dev;
605 ap->cbl = ATA_CBL_SATA;
606 ap->scsi_host = shost;
607
608 rc = ata_tport_add(parent: ata_host->dev, ap);
609 if (rc)
610 goto free_port;
611
612 found_dev->sata_dev.ata_host = ata_host;
613 found_dev->sata_dev.ap = ap;
614
615 return 0;
616
617free_port:
618 ata_port_free(ap);
619free_host:
620 ata_host_put(host: ata_host);
621 return rc;
622}
623
624void sas_ata_task_abort(struct sas_task *task)
625{
626 struct ata_queued_cmd *qc = task->uldd_task;
627 struct completion *waiting;
628
629 /* Bounce SCSI-initiated commands to the SCSI EH */
630 if (qc->scsicmd) {
631 blk_abort_request(scsi_cmd_to_rq(scmd: qc->scsicmd));
632 return;
633 }
634
635 /* Internal command, fake a timeout and complete. */
636 qc->flags &= ~ATA_QCFLAG_ACTIVE;
637 qc->flags |= ATA_QCFLAG_EH;
638 qc->err_mask |= AC_ERR_TIMEOUT;
639 waiting = qc->private_data;
640 complete(waiting);
641}
642
643void sas_probe_sata(struct asd_sas_port *port)
644{
645 struct domain_device *dev, *n;
646
647 mutex_lock(&port->ha->disco_mutex);
648 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
649 if (!dev_is_sata(dev))
650 continue;
651
652 ata_port_probe(ap: dev->sata_dev.ap);
653 }
654 mutex_unlock(lock: &port->ha->disco_mutex);
655
656 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
657 if (!dev_is_sata(dev))
658 continue;
659
660 sas_ata_wait_eh(dev);
661
662 /* if libata could not bring the link up, don't surface
663 * the device
664 */
665 if (!ata_dev_enabled(dev: sas_to_ata_dev(dev)))
666 sas_fail_probe(dev, func: __func__, err: -ENODEV);
667 }
668
669}
670
671int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
672 struct domain_device *child, int phy_id)
673{
674 struct sas_rphy *rphy;
675 int ret;
676
677 if (child->linkrate > parent->min_linkrate) {
678 struct sas_phy *cphy = child->phy;
679 enum sas_linkrate min_prate = cphy->minimum_linkrate,
680 parent_min_lrate = parent->min_linkrate,
681 min_linkrate = (min_prate > parent_min_lrate) ?
682 parent_min_lrate : 0;
683 struct sas_phy_linkrates rates = {
684 .maximum_linkrate = parent->min_linkrate,
685 .minimum_linkrate = min_linkrate,
686 };
687
688 pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
689 SAS_ADDR(child->sas_addr), phy_id);
690 ret = sas_smp_phy_control(dev: parent, phy_id,
691 phy_func: PHY_FUNC_LINK_RESET, &rates);
692 if (ret) {
693 pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
694 SAS_ADDR(child->sas_addr), phy_id, ret);
695 return ret;
696 }
697 pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
698 SAS_ADDR(child->sas_addr), phy_id);
699 child->linkrate = child->min_linkrate;
700 }
701 ret = sas_get_ata_info(dev: child, phy);
702 if (ret)
703 return ret;
704
705 sas_init_dev(dev: child);
706 ret = sas_ata_init(found_dev: child);
707 if (ret)
708 return ret;
709
710 rphy = sas_end_device_alloc(phy->port);
711 if (!rphy)
712 return -ENOMEM;
713
714 rphy->identify.phy_identifier = phy_id;
715 child->rphy = rphy;
716 get_device(dev: &rphy->dev);
717
718 list_add_tail(new: &child->disco_list_node, head: &parent->port->disco_list);
719
720 ret = sas_discover_sata(dev: child);
721 if (ret) {
722 pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n",
723 SAS_ADDR(child->sas_addr),
724 SAS_ADDR(parent->sas_addr), phy_id, ret);
725 sas_rphy_free(child->rphy);
726 list_del(entry: &child->disco_list_node);
727 return ret;
728 }
729
730 return 0;
731}
732
733static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
734{
735 struct domain_device *dev, *n;
736
737 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
738 if (!dev_is_sata(dev))
739 continue;
740
741 sas_ata_wait_eh(dev);
742
743 /* if libata failed to power manage the device, tear it down */
744 if (ata_dev_disabled(dev: sas_to_ata_dev(dev)))
745 sas_fail_probe(dev, func, err: -ENODEV);
746 }
747}
748
749void sas_suspend_sata(struct asd_sas_port *port)
750{
751 struct domain_device *dev;
752
753 mutex_lock(&port->ha->disco_mutex);
754 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
755 struct sata_device *sata;
756
757 if (!dev_is_sata(dev))
758 continue;
759
760 sata = &dev->sata_dev;
761 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
762 continue;
763
764 ata_sas_port_suspend(ap: sata->ap);
765 }
766 mutex_unlock(lock: &port->ha->disco_mutex);
767
768 sas_ata_flush_pm_eh(port, func: __func__);
769}
770
771void sas_resume_sata(struct asd_sas_port *port)
772{
773 struct domain_device *dev;
774
775 mutex_lock(&port->ha->disco_mutex);
776 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
777 struct sata_device *sata;
778
779 if (!dev_is_sata(dev))
780 continue;
781
782 sata = &dev->sata_dev;
783 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
784 continue;
785
786 ata_sas_port_resume(ap: sata->ap);
787 }
788 mutex_unlock(lock: &port->ha->disco_mutex);
789
790 sas_ata_flush_pm_eh(port, func: __func__);
791}
792
793/**
794 * sas_discover_sata - discover an STP/SATA domain device
795 * @dev: pointer to struct domain_device of interest
796 *
797 * Devices directly attached to a HA port, have no parents. All other
798 * devices do, and should have their "parent" pointer set appropriately
799 * before calling this function.
800 */
801int sas_discover_sata(struct domain_device *dev)
802{
803 if (dev->dev_type == SAS_SATA_PM)
804 return -ENODEV;
805
806 dev->sata_dev.class = sas_get_ata_command_set(dev);
807 sas_fill_in_rphy(dev, rphy: dev->rphy);
808
809 return sas_notify_lldd_dev_found(dev);
810}
811
812static void async_sas_ata_eh(void *data, async_cookie_t cookie)
813{
814 struct domain_device *dev = data;
815 struct ata_port *ap = dev->sata_dev.ap;
816 struct sas_ha_struct *ha = dev->port->ha;
817
818 sas_ata_printk(KERN_DEBUG, ddev: dev, fmt: "dev error handler\n");
819 ata_scsi_port_error_handler(host: ha->shost, ap);
820 sas_put_device(dev);
821}
822
823void sas_ata_strategy_handler(struct Scsi_Host *shost)
824{
825 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
826 ASYNC_DOMAIN_EXCLUSIVE(async);
827 int i;
828
829 /* it's ok to defer revalidation events during ata eh, these
830 * disks are in one of three states:
831 * 1/ present for initial domain discovery, and these
832 * resets will cause bcn flutters
833 * 2/ hot removed, we'll discover that after eh fails
834 * 3/ hot added after initial discovery, lost the race, and need
835 * to catch the next train.
836 */
837 sas_disable_revalidation(ha: sas_ha);
838
839 spin_lock_irq(lock: &sas_ha->phy_port_lock);
840 for (i = 0; i < sas_ha->num_phys; i++) {
841 struct asd_sas_port *port = sas_ha->sas_port[i];
842 struct domain_device *dev;
843
844 spin_lock(lock: &port->dev_list_lock);
845 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
846 if (!dev_is_sata(dev))
847 continue;
848
849 /* hold a reference over eh since we may be
850 * racing with final remove once all commands
851 * are completed
852 */
853 kref_get(kref: &dev->kref);
854
855 async_schedule_domain(func: async_sas_ata_eh, data: dev, domain: &async);
856 }
857 spin_unlock(lock: &port->dev_list_lock);
858 }
859 spin_unlock_irq(lock: &sas_ha->phy_port_lock);
860
861 async_synchronize_full_domain(domain: &async);
862
863 sas_enable_revalidation(ha: sas_ha);
864}
865
866void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
867{
868 struct scsi_cmnd *cmd, *n;
869 struct domain_device *eh_dev;
870
871 do {
872 LIST_HEAD(sata_q);
873 eh_dev = NULL;
874
875 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
876 struct domain_device *ddev = cmd_to_domain_dev(cmd);
877
878 if (!dev_is_sata(dev: ddev) || TO_SAS_TASK(cmd))
879 continue;
880 if (eh_dev && eh_dev != ddev)
881 continue;
882 eh_dev = ddev;
883 list_move(list: &cmd->eh_entry, head: &sata_q);
884 }
885
886 if (!list_empty(head: &sata_q)) {
887 struct ata_port *ap = eh_dev->sata_dev.ap;
888
889 sas_ata_printk(KERN_DEBUG, ddev: eh_dev, fmt: "cmd error handler\n");
890 ata_scsi_cmd_error_handler(host: shost, ap, eh_q: &sata_q);
891 /*
892 * ata's error handler may leave the cmd on the list
893 * so make sure they don't remain on a stack list
894 * about to go out of scope.
895 *
896 * This looks strange, since the commands are
897 * now part of no list, but the next error
898 * action will be ata_port_error_handler()
899 * which takes no list and sweeps them up
900 * anyway from the ata tag array.
901 */
902 while (!list_empty(head: &sata_q))
903 list_del_init(entry: sata_q.next);
904 }
905 } while (eh_dev);
906}
907
908void sas_ata_schedule_reset(struct domain_device *dev)
909{
910 struct ata_eh_info *ehi;
911 struct ata_port *ap;
912 unsigned long flags;
913
914 if (!dev_is_sata(dev))
915 return;
916
917 ap = dev->sata_dev.ap;
918 ehi = &ap->link.eh_info;
919
920 spin_lock_irqsave(ap->lock, flags);
921 ehi->err_mask |= AC_ERR_TIMEOUT;
922 ehi->action |= ATA_EH_RESET;
923 ata_port_schedule_eh(ap);
924 spin_unlock_irqrestore(lock: ap->lock, flags);
925}
926EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
927
928void sas_ata_wait_eh(struct domain_device *dev)
929{
930 ata_port_wait_eh(ap: dev->sata_dev.ap);
931}
932
933void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
934{
935 struct ata_port *ap = device->sata_dev.ap;
936 struct ata_link *link = &ap->link;
937 unsigned long flags;
938
939 spin_lock_irqsave(ap->lock, flags);
940 device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
941 device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
942
943 link->eh_info.err_mask |= AC_ERR_DEV;
944 if (force_reset)
945 link->eh_info.action |= ATA_EH_RESET;
946 ata_link_abort(link);
947 spin_unlock_irqrestore(lock: ap->lock, flags);
948}
949EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
950
951int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
952{
953 struct sas_tmf_task tmf_task = {};
954 return sas_execute_tmf(device, parameter: fis, para_len: sizeof(struct host_to_dev_fis),
955 force_phy_id, tmf: &tmf_task);
956}
957EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
958
959static ssize_t sas_ncq_prio_supported_show(struct device *device,
960 struct device_attribute *attr,
961 char *buf)
962{
963 struct scsi_device *sdev = to_scsi_device(device);
964 struct domain_device *ddev = sdev_to_domain_dev(sdev);
965 bool supported;
966 int rc;
967
968 rc = ata_ncq_prio_supported(ap: ddev->sata_dev.ap, sdev, supported: &supported);
969 if (rc)
970 return rc;
971
972 return sysfs_emit(buf, fmt: "%d\n", supported);
973}
974
975static struct device_attribute dev_attr_sas_ncq_prio_supported =
976 __ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
977
978static ssize_t sas_ncq_prio_enable_show(struct device *device,
979 struct device_attribute *attr,
980 char *buf)
981{
982 struct scsi_device *sdev = to_scsi_device(device);
983 struct domain_device *ddev = sdev_to_domain_dev(sdev);
984 bool enabled;
985 int rc;
986
987 rc = ata_ncq_prio_enabled(ap: ddev->sata_dev.ap, sdev, enabled: &enabled);
988 if (rc)
989 return rc;
990
991 return sysfs_emit(buf, fmt: "%d\n", enabled);
992}
993
994static ssize_t sas_ncq_prio_enable_store(struct device *device,
995 struct device_attribute *attr,
996 const char *buf, size_t len)
997{
998 struct scsi_device *sdev = to_scsi_device(device);
999 struct domain_device *ddev = sdev_to_domain_dev(sdev);
1000 bool enable;
1001 int rc;
1002
1003 rc = kstrtobool(s: buf, res: &enable);
1004 if (rc)
1005 return rc;
1006
1007 rc = ata_ncq_prio_enable(ap: ddev->sata_dev.ap, sdev, enable);
1008 if (rc)
1009 return rc;
1010
1011 return len;
1012}
1013
1014static struct device_attribute dev_attr_sas_ncq_prio_enable =
1015 __ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
1016 sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
1017
1018static struct attribute *sas_ata_sdev_attrs[] = {
1019 &dev_attr_sas_ncq_prio_supported.attr,
1020 &dev_attr_sas_ncq_prio_enable.attr,
1021 NULL
1022};
1023
1024static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
1025 struct attribute *attr, int i)
1026{
1027 struct device *dev = kobj_to_dev(kobj);
1028 struct scsi_device *sdev = to_scsi_device(dev);
1029 struct domain_device *ddev = sdev_to_domain_dev(sdev);
1030
1031 if (!dev_is_sata(dev: ddev))
1032 return 0;
1033
1034 return attr->mode;
1035}
1036
1037const struct attribute_group sas_ata_sdev_attr_group = {
1038 .attrs = sas_ata_sdev_attrs,
1039 .is_visible = sas_ata_attr_is_visible,
1040};
1041EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
1042

source code of linux/drivers/scsi/libsas/sas_ata.c